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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" |
ac264b3b | 34 | #include "linux-fork.h" |
d6b0e80f AC |
35 | #include "gdbthread.h" |
36 | #include "gdbcmd.h" | |
37 | #include "regcache.h" | |
4f844a66 | 38 | #include "regset.h" |
10d6c8cd DJ |
39 | #include "inf-ptrace.h" |
40 | #include "auxv.h" | |
dba24537 | 41 | #include <sys/param.h> /* for MAXPATHLEN */ |
1777feb0 | 42 | #include <sys/procfs.h> /* for elf_gregset etc. */ |
dba24537 AC |
43 | #include "elf-bfd.h" /* for elfcore_write_* */ |
44 | #include "gregset.h" /* for gregset */ | |
45 | #include "gdbcore.h" /* for get_exec_file */ | |
46 | #include <ctype.h> /* for isdigit */ | |
1777feb0 | 47 | #include "gdbthread.h" /* for struct thread_info etc. */ |
dba24537 AC |
48 | #include "gdb_stat.h" /* for struct stat */ |
49 | #include <fcntl.h> /* for O_RDONLY */ | |
b84876c2 PA |
50 | #include "inf-loop.h" |
51 | #include "event-loop.h" | |
52 | #include "event-top.h" | |
07e059b5 VP |
53 | #include <pwd.h> |
54 | #include <sys/types.h> | |
55 | #include "gdb_dirent.h" | |
56 | #include "xml-support.h" | |
191c4426 | 57 | #include "terminal.h" |
efcbbd14 | 58 | #include <sys/vfs.h> |
6c95b8df | 59 | #include "solib.h" |
efcbbd14 UW |
60 | |
61 | #ifndef SPUFS_MAGIC | |
62 | #define SPUFS_MAGIC 0x23c9b64e | |
63 | #endif | |
dba24537 | 64 | |
10568435 JK |
65 | #ifdef HAVE_PERSONALITY |
66 | # include <sys/personality.h> | |
67 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
68 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
69 | # endif | |
70 | #endif /* HAVE_PERSONALITY */ | |
71 | ||
1777feb0 | 72 | /* This comment documents high-level logic of this file. |
8a77dff3 VP |
73 | |
74 | Waiting for events in sync mode | |
75 | =============================== | |
76 | ||
77 | When waiting for an event in a specific thread, we just use waitpid, passing | |
78 | the specific pid, and not passing WNOHANG. | |
79 | ||
1777feb0 | 80 | When waiting for an event in all threads, waitpid is not quite good. Prior to |
8a77dff3 | 81 | version 2.4, Linux can either wait for event in main thread, or in secondary |
1777feb0 | 82 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might |
8a77dff3 VP |
83 | miss an event. The solution is to use non-blocking waitpid, together with |
84 | sigsuspend. First, we use non-blocking waitpid to get an event in the main | |
1777feb0 | 85 | process, if any. Second, we use non-blocking waitpid with the __WCLONED |
8a77dff3 VP |
86 | flag to check for events in cloned processes. If nothing is found, we use |
87 | sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something | |
88 | happened to a child process -- and SIGCHLD will be delivered both for events | |
89 | in main debugged process and in cloned processes. As soon as we know there's | |
3e43a32a MS |
90 | an event, we get back to calling nonblocking waitpid with and without |
91 | __WCLONED. | |
8a77dff3 VP |
92 | |
93 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
1777feb0 | 94 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's |
8a77dff3 VP |
95 | blocked, the signal becomes pending and sigsuspend immediately |
96 | notices it and returns. | |
97 | ||
98 | Waiting for events in async mode | |
99 | ================================ | |
100 | ||
7feb7d06 PA |
101 | In async mode, GDB should always be ready to handle both user input |
102 | and target events, so neither blocking waitpid nor sigsuspend are | |
103 | viable options. Instead, we should asynchronously notify the GDB main | |
104 | event loop whenever there's an unprocessed event from the target. We | |
105 | detect asynchronous target events by handling SIGCHLD signals. To | |
106 | notify the event loop about target events, the self-pipe trick is used | |
107 | --- a pipe is registered as waitable event source in the event loop, | |
108 | the event loop select/poll's on the read end of this pipe (as well on | |
109 | other event sources, e.g., stdin), and the SIGCHLD handler writes a | |
110 | byte to this pipe. This is more portable than relying on | |
111 | pselect/ppoll, since on kernels that lack those syscalls, libc | |
112 | emulates them with select/poll+sigprocmask, and that is racy | |
113 | (a.k.a. plain broken). | |
114 | ||
115 | Obviously, if we fail to notify the event loop if there's a target | |
116 | event, it's bad. OTOH, if we notify the event loop when there's no | |
117 | event from the target, linux_nat_wait will detect that there's no real | |
118 | event to report, and return event of type TARGET_WAITKIND_IGNORE. | |
119 | This is mostly harmless, but it will waste time and is better avoided. | |
120 | ||
121 | The main design point is that every time GDB is outside linux-nat.c, | |
122 | we have a SIGCHLD handler installed that is called when something | |
123 | happens to the target and notifies the GDB event loop. Whenever GDB | |
124 | core decides to handle the event, and calls into linux-nat.c, we | |
125 | process things as in sync mode, except that the we never block in | |
126 | sigsuspend. | |
127 | ||
128 | While processing an event, we may end up momentarily blocked in | |
129 | waitpid calls. Those waitpid calls, while blocking, are guarantied to | |
130 | return quickly. E.g., in all-stop mode, before reporting to the core | |
131 | that an LWP hit a breakpoint, all LWPs are stopped by sending them | |
132 | SIGSTOP, and synchronously waiting for the SIGSTOP to be reported. | |
133 | Note that this is different from blocking indefinitely waiting for the | |
134 | next event --- here, we're already handling an event. | |
8a77dff3 VP |
135 | |
136 | Use of signals | |
137 | ============== | |
138 | ||
139 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
140 | signal is not entirely significant; we just need for a signal to be delivered, | |
141 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
142 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
143 | be queued once; we do not keep track of other sources of SIGSTOP. | |
144 | ||
145 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
146 | use them, because they have special behavior when the signal is generated - | |
147 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
148 | kills the entire thread group. | |
149 | ||
150 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
151 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
152 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
153 | ||
154 | We could use a real-time signal instead. This would solve those problems; we | |
155 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
156 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
157 | generates it, and there are races with trying to find a signal that is not | |
158 | blocked. */ | |
a0ef4274 | 159 | |
dba24537 AC |
160 | #ifndef O_LARGEFILE |
161 | #define O_LARGEFILE 0 | |
162 | #endif | |
0274a8ce | 163 | |
ca2163eb PA |
164 | /* Unlike other extended result codes, WSTOPSIG (status) on |
165 | PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but | |
166 | instead SIGTRAP with bit 7 set. */ | |
167 | #define SYSCALL_SIGTRAP (SIGTRAP | 0x80) | |
168 | ||
10d6c8cd DJ |
169 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
170 | the use of the multi-threaded target. */ | |
171 | static struct target_ops *linux_ops; | |
f973ed9c | 172 | static struct target_ops linux_ops_saved; |
10d6c8cd | 173 | |
9f0bdab8 DJ |
174 | /* The method to call, if any, when a new thread is attached. */ |
175 | static void (*linux_nat_new_thread) (ptid_t); | |
176 | ||
5b009018 PA |
177 | /* The method to call, if any, when the siginfo object needs to be |
178 | converted between the layout returned by ptrace, and the layout in | |
179 | the architecture of the inferior. */ | |
180 | static int (*linux_nat_siginfo_fixup) (struct siginfo *, | |
181 | gdb_byte *, | |
182 | int); | |
183 | ||
ac264b3b MS |
184 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
185 | Called by our to_xfer_partial. */ | |
186 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
187 | enum target_object, | |
188 | const char *, gdb_byte *, | |
189 | const gdb_byte *, | |
10d6c8cd DJ |
190 | ULONGEST, LONGEST); |
191 | ||
d6b0e80f | 192 | static int debug_linux_nat; |
920d2a44 AC |
193 | static void |
194 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
195 | struct cmd_list_element *c, const char *value) | |
196 | { | |
197 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
198 | value); | |
199 | } | |
d6b0e80f | 200 | |
10568435 JK |
201 | static int disable_randomization = 1; |
202 | ||
203 | static void | |
204 | show_disable_randomization (struct ui_file *file, int from_tty, | |
205 | struct cmd_list_element *c, const char *value) | |
206 | { | |
207 | #ifdef HAVE_PERSONALITY | |
3e43a32a MS |
208 | fprintf_filtered (file, |
209 | _("Disabling randomization of debuggee's " | |
210 | "virtual address space is %s.\n"), | |
10568435 JK |
211 | value); |
212 | #else /* !HAVE_PERSONALITY */ | |
3e43a32a MS |
213 | fputs_filtered (_("Disabling randomization of debuggee's " |
214 | "virtual address space is unsupported on\n" | |
215 | "this platform.\n"), file); | |
10568435 JK |
216 | #endif /* !HAVE_PERSONALITY */ |
217 | } | |
218 | ||
219 | static void | |
3e43a32a MS |
220 | set_disable_randomization (char *args, int from_tty, |
221 | struct cmd_list_element *c) | |
10568435 JK |
222 | { |
223 | #ifndef HAVE_PERSONALITY | |
3e43a32a MS |
224 | error (_("Disabling randomization of debuggee's " |
225 | "virtual address space is unsupported on\n" | |
226 | "this platform.")); | |
10568435 JK |
227 | #endif /* !HAVE_PERSONALITY */ |
228 | } | |
229 | ||
ae087d01 DJ |
230 | struct simple_pid_list |
231 | { | |
232 | int pid; | |
3d799a95 | 233 | int status; |
ae087d01 DJ |
234 | struct simple_pid_list *next; |
235 | }; | |
236 | struct simple_pid_list *stopped_pids; | |
237 | ||
3993f6b1 DJ |
238 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
239 | can not be used, 1 if it can. */ | |
240 | ||
241 | static int linux_supports_tracefork_flag = -1; | |
242 | ||
3e43a32a MS |
243 | /* This variable is a tri-state flag: -1 for unknown, 0 if |
244 | PTRACE_O_TRACESYSGOOD can not be used, 1 if it can. */ | |
a96d9b2e SDJ |
245 | |
246 | static int linux_supports_tracesysgood_flag = -1; | |
247 | ||
9016a515 DJ |
248 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
249 | PTRACE_O_TRACEVFORKDONE. */ | |
250 | ||
251 | static int linux_supports_tracevforkdone_flag = -1; | |
252 | ||
1777feb0 | 253 | /* Async mode support. */ |
b84876c2 | 254 | |
b84876c2 PA |
255 | /* Zero if the async mode, although enabled, is masked, which means |
256 | linux_nat_wait should behave as if async mode was off. */ | |
257 | static int linux_nat_async_mask_value = 1; | |
258 | ||
a96d9b2e SDJ |
259 | /* Stores the current used ptrace() options. */ |
260 | static int current_ptrace_options = 0; | |
261 | ||
b84876c2 PA |
262 | /* The read/write ends of the pipe registered as waitable file in the |
263 | event loop. */ | |
264 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
265 | ||
7feb7d06 | 266 | /* Flush the event pipe. */ |
b84876c2 | 267 | |
7feb7d06 PA |
268 | static void |
269 | async_file_flush (void) | |
b84876c2 | 270 | { |
7feb7d06 PA |
271 | int ret; |
272 | char buf; | |
b84876c2 | 273 | |
7feb7d06 | 274 | do |
b84876c2 | 275 | { |
7feb7d06 | 276 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 277 | } |
7feb7d06 | 278 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
279 | } |
280 | ||
7feb7d06 PA |
281 | /* Put something (anything, doesn't matter what, or how much) in event |
282 | pipe, so that the select/poll in the event-loop realizes we have | |
283 | something to process. */ | |
252fbfc8 | 284 | |
b84876c2 | 285 | static void |
7feb7d06 | 286 | async_file_mark (void) |
b84876c2 | 287 | { |
7feb7d06 | 288 | int ret; |
b84876c2 | 289 | |
7feb7d06 PA |
290 | /* It doesn't really matter what the pipe contains, as long we end |
291 | up with something in it. Might as well flush the previous | |
292 | left-overs. */ | |
293 | async_file_flush (); | |
b84876c2 | 294 | |
7feb7d06 | 295 | do |
b84876c2 | 296 | { |
7feb7d06 | 297 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 298 | } |
7feb7d06 | 299 | while (ret == -1 && errno == EINTR); |
b84876c2 | 300 | |
7feb7d06 PA |
301 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
302 | be awakened anyway. */ | |
b84876c2 PA |
303 | } |
304 | ||
7feb7d06 | 305 | static void linux_nat_async (void (*callback) |
3e43a32a MS |
306 | (enum inferior_event_type event_type, |
307 | void *context), | |
7feb7d06 PA |
308 | void *context); |
309 | static int linux_nat_async_mask (int mask); | |
310 | static int kill_lwp (int lwpid, int signo); | |
311 | ||
312 | static int stop_callback (struct lwp_info *lp, void *data); | |
313 | ||
314 | static void block_child_signals (sigset_t *prev_mask); | |
315 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
2277426b PA |
316 | |
317 | struct lwp_info; | |
318 | static struct lwp_info *add_lwp (ptid_t ptid); | |
319 | static void purge_lwp_list (int pid); | |
320 | static struct lwp_info *find_lwp_pid (ptid_t ptid); | |
321 | ||
ae087d01 DJ |
322 | \f |
323 | /* Trivial list manipulation functions to keep track of a list of | |
324 | new stopped processes. */ | |
325 | static void | |
3d799a95 | 326 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
327 | { |
328 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
e0881a8e | 329 | |
ae087d01 | 330 | new_pid->pid = pid; |
3d799a95 | 331 | new_pid->status = status; |
ae087d01 DJ |
332 | new_pid->next = *listp; |
333 | *listp = new_pid; | |
334 | } | |
335 | ||
336 | static int | |
46a96992 | 337 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) |
ae087d01 DJ |
338 | { |
339 | struct simple_pid_list **p; | |
340 | ||
341 | for (p = listp; *p != NULL; p = &(*p)->next) | |
342 | if ((*p)->pid == pid) | |
343 | { | |
344 | struct simple_pid_list *next = (*p)->next; | |
e0881a8e | 345 | |
46a96992 | 346 | *statusp = (*p)->status; |
ae087d01 DJ |
347 | xfree (*p); |
348 | *p = next; | |
349 | return 1; | |
350 | } | |
351 | return 0; | |
352 | } | |
353 | ||
3d799a95 DJ |
354 | static void |
355 | linux_record_stopped_pid (int pid, int status) | |
ae087d01 | 356 | { |
3d799a95 | 357 | add_to_pid_list (&stopped_pids, pid, status); |
ae087d01 DJ |
358 | } |
359 | ||
3993f6b1 DJ |
360 | \f |
361 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
362 | ||
363 | static void | |
364 | linux_tracefork_child (void) | |
365 | { | |
3993f6b1 DJ |
366 | ptrace (PTRACE_TRACEME, 0, 0, 0); |
367 | kill (getpid (), SIGSTOP); | |
368 | fork (); | |
48bb3cce | 369 | _exit (0); |
3993f6b1 DJ |
370 | } |
371 | ||
7feb7d06 | 372 | /* Wrapper function for waitpid which handles EINTR. */ |
b957e937 DJ |
373 | |
374 | static int | |
46a96992 | 375 | my_waitpid (int pid, int *statusp, int flags) |
b957e937 DJ |
376 | { |
377 | int ret; | |
b84876c2 | 378 | |
b957e937 DJ |
379 | do |
380 | { | |
46a96992 | 381 | ret = waitpid (pid, statusp, flags); |
b957e937 DJ |
382 | } |
383 | while (ret == -1 && errno == EINTR); | |
384 | ||
385 | return ret; | |
386 | } | |
387 | ||
388 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
389 | ||
390 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
391 | we know that the feature is not available. This may change the tracing | |
392 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
393 | ||
394 | However, if it succeeds, we don't know for sure that the feature is | |
395 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 396 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
397 | fork tracing, and let it fork. If the process exits, we assume that we |
398 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
399 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
400 | |
401 | static void | |
b957e937 | 402 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
403 | { |
404 | int child_pid, ret, status; | |
405 | long second_pid; | |
7feb7d06 | 406 | sigset_t prev_mask; |
4c28f408 | 407 | |
7feb7d06 PA |
408 | /* We don't want those ptrace calls to be interrupted. */ |
409 | block_child_signals (&prev_mask); | |
3993f6b1 | 410 | |
b957e937 DJ |
411 | linux_supports_tracefork_flag = 0; |
412 | linux_supports_tracevforkdone_flag = 0; | |
413 | ||
414 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
415 | if (ret != 0) | |
7feb7d06 PA |
416 | { |
417 | restore_child_signals_mask (&prev_mask); | |
418 | return; | |
419 | } | |
b957e937 | 420 | |
3993f6b1 DJ |
421 | child_pid = fork (); |
422 | if (child_pid == -1) | |
e2e0b3e5 | 423 | perror_with_name (("fork")); |
3993f6b1 DJ |
424 | |
425 | if (child_pid == 0) | |
426 | linux_tracefork_child (); | |
427 | ||
b957e937 | 428 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 429 | if (ret == -1) |
e2e0b3e5 | 430 | perror_with_name (("waitpid")); |
3993f6b1 | 431 | else if (ret != child_pid) |
8a3fe4f8 | 432 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 433 | if (! WIFSTOPPED (status)) |
3e43a32a MS |
434 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), |
435 | status); | |
3993f6b1 | 436 | |
3993f6b1 DJ |
437 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
438 | if (ret != 0) | |
439 | { | |
b957e937 DJ |
440 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
441 | if (ret != 0) | |
442 | { | |
8a3fe4f8 | 443 | warning (_("linux_test_for_tracefork: failed to kill child")); |
7feb7d06 | 444 | restore_child_signals_mask (&prev_mask); |
b957e937 DJ |
445 | return; |
446 | } | |
447 | ||
448 | ret = my_waitpid (child_pid, &status, 0); | |
449 | if (ret != child_pid) | |
3e43a32a MS |
450 | warning (_("linux_test_for_tracefork: failed " |
451 | "to wait for killed child")); | |
b957e937 | 452 | else if (!WIFSIGNALED (status)) |
3e43a32a MS |
453 | warning (_("linux_test_for_tracefork: unexpected " |
454 | "wait status 0x%x from killed child"), status); | |
b957e937 | 455 | |
7feb7d06 | 456 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
457 | return; |
458 | } | |
459 | ||
9016a515 DJ |
460 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
461 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
462 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
463 | linux_supports_tracevforkdone_flag = (ret == 0); | |
464 | ||
b957e937 DJ |
465 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
466 | if (ret != 0) | |
8a3fe4f8 | 467 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
468 | |
469 | ret = my_waitpid (child_pid, &status, 0); | |
470 | ||
3993f6b1 DJ |
471 | if (ret == child_pid && WIFSTOPPED (status) |
472 | && status >> 16 == PTRACE_EVENT_FORK) | |
473 | { | |
474 | second_pid = 0; | |
475 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
476 | if (ret == 0 && second_pid != 0) | |
477 | { | |
478 | int second_status; | |
479 | ||
480 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
481 | my_waitpid (second_pid, &second_status, 0); |
482 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
483 | if (ret != 0) | |
3e43a32a MS |
484 | warning (_("linux_test_for_tracefork: " |
485 | "failed to kill second child")); | |
97725dc4 | 486 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
487 | } |
488 | } | |
b957e937 | 489 | else |
8a3fe4f8 AC |
490 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
491 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 492 | |
b957e937 DJ |
493 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
494 | if (ret != 0) | |
8a3fe4f8 | 495 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 496 | my_waitpid (child_pid, &status, 0); |
4c28f408 | 497 | |
7feb7d06 | 498 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
499 | } |
500 | ||
a96d9b2e SDJ |
501 | /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls. |
502 | ||
503 | We try to enable syscall tracing on ORIGINAL_PID. If this fails, | |
504 | we know that the feature is not available. This may change the tracing | |
505 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. */ | |
506 | ||
507 | static void | |
508 | linux_test_for_tracesysgood (int original_pid) | |
509 | { | |
510 | int ret; | |
511 | sigset_t prev_mask; | |
512 | ||
513 | /* We don't want those ptrace calls to be interrupted. */ | |
514 | block_child_signals (&prev_mask); | |
515 | ||
516 | linux_supports_tracesysgood_flag = 0; | |
517 | ||
518 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACESYSGOOD); | |
519 | if (ret != 0) | |
520 | goto out; | |
521 | ||
522 | linux_supports_tracesysgood_flag = 1; | |
523 | out: | |
524 | restore_child_signals_mask (&prev_mask); | |
525 | } | |
526 | ||
527 | /* Determine wether we support PTRACE_O_TRACESYSGOOD option available. | |
528 | This function also sets linux_supports_tracesysgood_flag. */ | |
529 | ||
530 | static int | |
531 | linux_supports_tracesysgood (int pid) | |
532 | { | |
533 | if (linux_supports_tracesysgood_flag == -1) | |
534 | linux_test_for_tracesysgood (pid); | |
535 | return linux_supports_tracesysgood_flag; | |
536 | } | |
537 | ||
3993f6b1 DJ |
538 | /* Return non-zero iff we have tracefork functionality available. |
539 | This function also sets linux_supports_tracefork_flag. */ | |
540 | ||
541 | static int | |
b957e937 | 542 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
543 | { |
544 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 545 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
546 | return linux_supports_tracefork_flag; |
547 | } | |
548 | ||
9016a515 | 549 | static int |
b957e937 | 550 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
551 | { |
552 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 553 | linux_test_for_tracefork (pid); |
9016a515 DJ |
554 | return linux_supports_tracevforkdone_flag; |
555 | } | |
556 | ||
a96d9b2e SDJ |
557 | static void |
558 | linux_enable_tracesysgood (ptid_t ptid) | |
559 | { | |
560 | int pid = ptid_get_lwp (ptid); | |
561 | ||
562 | if (pid == 0) | |
563 | pid = ptid_get_pid (ptid); | |
564 | ||
565 | if (linux_supports_tracesysgood (pid) == 0) | |
566 | return; | |
567 | ||
568 | current_ptrace_options |= PTRACE_O_TRACESYSGOOD; | |
569 | ||
570 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); | |
571 | } | |
572 | ||
3993f6b1 | 573 | \f |
4de4c07c DJ |
574 | void |
575 | linux_enable_event_reporting (ptid_t ptid) | |
576 | { | |
d3587048 | 577 | int pid = ptid_get_lwp (ptid); |
4de4c07c | 578 | |
d3587048 DJ |
579 | if (pid == 0) |
580 | pid = ptid_get_pid (ptid); | |
581 | ||
b957e937 | 582 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
583 | return; |
584 | ||
a96d9b2e SDJ |
585 | current_ptrace_options |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK |
586 | | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE; | |
587 | ||
b957e937 | 588 | if (linux_supports_tracevforkdone (pid)) |
a96d9b2e | 589 | current_ptrace_options |= PTRACE_O_TRACEVFORKDONE; |
9016a515 DJ |
590 | |
591 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
592 | read-only process state. */ | |
4de4c07c | 593 | |
a96d9b2e | 594 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); |
4de4c07c DJ |
595 | } |
596 | ||
6d8fd2b7 UW |
597 | static void |
598 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
599 | { |
600 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
0ec9a092 | 601 | check_for_thread_db (); |
a96d9b2e | 602 | linux_enable_tracesysgood (pid_to_ptid (pid)); |
4de4c07c DJ |
603 | } |
604 | ||
10d6c8cd | 605 | static void |
4de4c07c DJ |
606 | linux_child_post_startup_inferior (ptid_t ptid) |
607 | { | |
608 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 609 | check_for_thread_db (); |
a96d9b2e | 610 | linux_enable_tracesysgood (ptid); |
4de4c07c DJ |
611 | } |
612 | ||
6d8fd2b7 UW |
613 | static int |
614 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 615 | { |
7feb7d06 | 616 | sigset_t prev_mask; |
9016a515 | 617 | int has_vforked; |
4de4c07c DJ |
618 | int parent_pid, child_pid; |
619 | ||
7feb7d06 | 620 | block_child_signals (&prev_mask); |
b84876c2 | 621 | |
e58b0e63 PA |
622 | has_vforked = (inferior_thread ()->pending_follow.kind |
623 | == TARGET_WAITKIND_VFORKED); | |
624 | parent_pid = ptid_get_lwp (inferior_ptid); | |
d3587048 | 625 | if (parent_pid == 0) |
e58b0e63 PA |
626 | parent_pid = ptid_get_pid (inferior_ptid); |
627 | child_pid = PIDGET (inferior_thread ()->pending_follow.value.related_pid); | |
4de4c07c | 628 | |
2277426b PA |
629 | if (!detach_fork) |
630 | linux_enable_event_reporting (pid_to_ptid (child_pid)); | |
631 | ||
6c95b8df PA |
632 | if (has_vforked |
633 | && !non_stop /* Non-stop always resumes both branches. */ | |
634 | && (!target_is_async_p () || sync_execution) | |
635 | && !(follow_child || detach_fork || sched_multi)) | |
636 | { | |
637 | /* The parent stays blocked inside the vfork syscall until the | |
638 | child execs or exits. If we don't let the child run, then | |
639 | the parent stays blocked. If we're telling the parent to run | |
640 | in the foreground, the user will not be able to ctrl-c to get | |
641 | back the terminal, effectively hanging the debug session. */ | |
ac74f770 MS |
642 | fprintf_filtered (gdb_stderr, _("\ |
643 | Can not resume the parent process over vfork in the foreground while\n\ | |
644 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
645 | \"set schedule-multiple\".\n")); | |
646 | /* FIXME output string > 80 columns. */ | |
6c95b8df PA |
647 | return 1; |
648 | } | |
649 | ||
4de4c07c DJ |
650 | if (! follow_child) |
651 | { | |
6c95b8df | 652 | struct lwp_info *child_lp = NULL; |
4de4c07c | 653 | |
1777feb0 | 654 | /* We're already attached to the parent, by default. */ |
4de4c07c | 655 | |
ac264b3b MS |
656 | /* Detach new forked process? */ |
657 | if (detach_fork) | |
f75c00e4 | 658 | { |
6c95b8df PA |
659 | /* Before detaching from the child, remove all breakpoints |
660 | from it. If we forked, then this has already been taken | |
661 | care of by infrun.c. If we vforked however, any | |
662 | breakpoint inserted in the parent is visible in the | |
663 | child, even those added while stopped in a vfork | |
664 | catchpoint. This will remove the breakpoints from the | |
665 | parent also, but they'll be reinserted below. */ | |
666 | if (has_vforked) | |
667 | { | |
668 | /* keep breakpoints list in sync. */ | |
669 | remove_breakpoints_pid (GET_PID (inferior_ptid)); | |
670 | } | |
671 | ||
e85a822c | 672 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
673 | { |
674 | target_terminal_ours (); | |
675 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
676 | "Detaching after fork from " |
677 | "child process %d.\n", | |
ac264b3b MS |
678 | child_pid); |
679 | } | |
4de4c07c | 680 | |
ac264b3b MS |
681 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
682 | } | |
683 | else | |
684 | { | |
77435e4c | 685 | struct inferior *parent_inf, *child_inf; |
2277426b | 686 | struct cleanup *old_chain; |
7f9f62ba PA |
687 | |
688 | /* Add process to GDB's tables. */ | |
77435e4c PA |
689 | child_inf = add_inferior (child_pid); |
690 | ||
e58b0e63 | 691 | parent_inf = current_inferior (); |
77435e4c | 692 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 693 | copy_terminal_info (child_inf, parent_inf); |
7f9f62ba | 694 | |
2277426b | 695 | old_chain = save_inferior_ptid (); |
6c95b8df | 696 | save_current_program_space (); |
2277426b PA |
697 | |
698 | inferior_ptid = ptid_build (child_pid, child_pid, 0); | |
699 | add_thread (inferior_ptid); | |
6c95b8df PA |
700 | child_lp = add_lwp (inferior_ptid); |
701 | child_lp->stopped = 1; | |
702 | child_lp->resumed = 1; | |
2277426b | 703 | |
6c95b8df PA |
704 | /* If this is a vfork child, then the address-space is |
705 | shared with the parent. */ | |
706 | if (has_vforked) | |
707 | { | |
708 | child_inf->pspace = parent_inf->pspace; | |
709 | child_inf->aspace = parent_inf->aspace; | |
710 | ||
711 | /* The parent will be frozen until the child is done | |
712 | with the shared region. Keep track of the | |
713 | parent. */ | |
714 | child_inf->vfork_parent = parent_inf; | |
715 | child_inf->pending_detach = 0; | |
716 | parent_inf->vfork_child = child_inf; | |
717 | parent_inf->pending_detach = 0; | |
718 | } | |
719 | else | |
720 | { | |
721 | child_inf->aspace = new_address_space (); | |
722 | child_inf->pspace = add_program_space (child_inf->aspace); | |
723 | child_inf->removable = 1; | |
724 | set_current_program_space (child_inf->pspace); | |
725 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
726 | ||
727 | /* Let the shared library layer (solib-svr4) learn about | |
728 | this new process, relocate the cloned exec, pull in | |
729 | shared libraries, and install the solib event | |
730 | breakpoint. If a "cloned-VM" event was propagated | |
731 | better throughout the core, this wouldn't be | |
732 | required. */ | |
268a4a75 | 733 | solib_create_inferior_hook (0); |
6c95b8df PA |
734 | } |
735 | ||
736 | /* Let the thread_db layer learn about this new process. */ | |
2277426b PA |
737 | check_for_thread_db (); |
738 | ||
739 | do_cleanups (old_chain); | |
ac264b3b | 740 | } |
9016a515 DJ |
741 | |
742 | if (has_vforked) | |
743 | { | |
6c95b8df PA |
744 | struct lwp_info *lp; |
745 | struct inferior *parent_inf; | |
746 | ||
747 | parent_inf = current_inferior (); | |
748 | ||
749 | /* If we detached from the child, then we have to be careful | |
750 | to not insert breakpoints in the parent until the child | |
751 | is done with the shared memory region. However, if we're | |
752 | staying attached to the child, then we can and should | |
753 | insert breakpoints, so that we can debug it. A | |
754 | subsequent child exec or exit is enough to know when does | |
755 | the child stops using the parent's address space. */ | |
756 | parent_inf->waiting_for_vfork_done = detach_fork; | |
56710373 | 757 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
6c95b8df PA |
758 | |
759 | lp = find_lwp_pid (pid_to_ptid (parent_pid)); | |
b957e937 DJ |
760 | gdb_assert (linux_supports_tracefork_flag >= 0); |
761 | if (linux_supports_tracevforkdone (0)) | |
9016a515 | 762 | { |
6c95b8df PA |
763 | if (debug_linux_nat) |
764 | fprintf_unfiltered (gdb_stdlog, | |
765 | "LCFF: waiting for VFORK_DONE on %d\n", | |
766 | parent_pid); | |
767 | ||
768 | lp->stopped = 1; | |
769 | lp->resumed = 1; | |
9016a515 | 770 | |
6c95b8df PA |
771 | /* We'll handle the VFORK_DONE event like any other |
772 | event, in target_wait. */ | |
9016a515 DJ |
773 | } |
774 | else | |
775 | { | |
776 | /* We can't insert breakpoints until the child has | |
777 | finished with the shared memory region. We need to | |
778 | wait until that happens. Ideal would be to just | |
779 | call: | |
780 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
781 | - waitpid (parent_pid, &status, __WALL); | |
782 | However, most architectures can't handle a syscall | |
783 | being traced on the way out if it wasn't traced on | |
784 | the way in. | |
785 | ||
786 | We might also think to loop, continuing the child | |
787 | until it exits or gets a SIGTRAP. One problem is | |
788 | that the child might call ptrace with PTRACE_TRACEME. | |
789 | ||
790 | There's no simple and reliable way to figure out when | |
791 | the vforked child will be done with its copy of the | |
792 | shared memory. We could step it out of the syscall, | |
793 | two instructions, let it go, and then single-step the | |
794 | parent once. When we have hardware single-step, this | |
795 | would work; with software single-step it could still | |
796 | be made to work but we'd have to be able to insert | |
797 | single-step breakpoints in the child, and we'd have | |
798 | to insert -just- the single-step breakpoint in the | |
799 | parent. Very awkward. | |
800 | ||
801 | In the end, the best we can do is to make sure it | |
802 | runs for a little while. Hopefully it will be out of | |
803 | range of any breakpoints we reinsert. Usually this | |
804 | is only the single-step breakpoint at vfork's return | |
805 | point. */ | |
806 | ||
6c95b8df PA |
807 | if (debug_linux_nat) |
808 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
809 | "LCFF: no VFORK_DONE " |
810 | "support, sleeping a bit\n"); | |
6c95b8df | 811 | |
9016a515 | 812 | usleep (10000); |
9016a515 | 813 | |
6c95b8df PA |
814 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
815 | and leave it pending. The next linux_nat_resume call | |
816 | will notice a pending event, and bypasses actually | |
817 | resuming the inferior. */ | |
818 | lp->status = 0; | |
819 | lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
820 | lp->stopped = 0; | |
821 | lp->resumed = 1; | |
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; |
2277426b | 833 | struct lwp_info *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 PA |
892 | add_thread (inferior_ptid); |
893 | lp = add_lwp (inferior_ptid); | |
894 | lp->stopped = 1; | |
6c95b8df PA |
895 | lp->resumed = 1; |
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 | ||
1163 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1164 | ||
1165 | lp->ptid = ptid; | |
dc146f7c | 1166 | lp->core = -1; |
d6b0e80f AC |
1167 | |
1168 | lp->next = lwp_list; | |
1169 | lwp_list = lp; | |
d6b0e80f | 1170 | |
d90e17a7 | 1171 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1172 | linux_nat_new_thread (ptid); |
1173 | ||
d6b0e80f AC |
1174 | return lp; |
1175 | } | |
1176 | ||
1177 | /* Remove the LWP specified by PID from the list. */ | |
1178 | ||
1179 | static void | |
1180 | delete_lwp (ptid_t ptid) | |
1181 | { | |
1182 | struct lwp_info *lp, *lpprev; | |
1183 | ||
1184 | lpprev = NULL; | |
1185 | ||
1186 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1187 | if (ptid_equal (lp->ptid, ptid)) | |
1188 | break; | |
1189 | ||
1190 | if (!lp) | |
1191 | return; | |
1192 | ||
d6b0e80f AC |
1193 | if (lpprev) |
1194 | lpprev->next = lp->next; | |
1195 | else | |
1196 | lwp_list = lp->next; | |
1197 | ||
1198 | xfree (lp); | |
1199 | } | |
1200 | ||
1201 | /* Return a pointer to the structure describing the LWP corresponding | |
1202 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1203 | ||
1204 | static struct lwp_info * | |
1205 | find_lwp_pid (ptid_t ptid) | |
1206 | { | |
1207 | struct lwp_info *lp; | |
1208 | int lwp; | |
1209 | ||
1210 | if (is_lwp (ptid)) | |
1211 | lwp = GET_LWP (ptid); | |
1212 | else | |
1213 | lwp = GET_PID (ptid); | |
1214 | ||
1215 | for (lp = lwp_list; lp; lp = lp->next) | |
1216 | if (lwp == GET_LWP (lp->ptid)) | |
1217 | return lp; | |
1218 | ||
1219 | return NULL; | |
1220 | } | |
1221 | ||
1222 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
1223 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1224 | pointer to the structure describing that LWP immediately. | |
1225 | Otherwise return NULL. */ | |
1226 | ||
1227 | struct lwp_info * | |
d90e17a7 PA |
1228 | iterate_over_lwps (ptid_t filter, |
1229 | int (*callback) (struct lwp_info *, void *), | |
1230 | void *data) | |
d6b0e80f AC |
1231 | { |
1232 | struct lwp_info *lp, *lpnext; | |
1233 | ||
1234 | for (lp = lwp_list; lp; lp = lpnext) | |
1235 | { | |
1236 | lpnext = lp->next; | |
d90e17a7 PA |
1237 | |
1238 | if (ptid_match (lp->ptid, filter)) | |
1239 | { | |
1240 | if ((*callback) (lp, data)) | |
1241 | return lp; | |
1242 | } | |
d6b0e80f AC |
1243 | } |
1244 | ||
1245 | return NULL; | |
1246 | } | |
1247 | ||
2277426b PA |
1248 | /* Update our internal state when changing from one checkpoint to |
1249 | another indicated by NEW_PTID. We can only switch single-threaded | |
1250 | applications, so we only create one new LWP, and the previous list | |
1251 | is discarded. */ | |
f973ed9c DJ |
1252 | |
1253 | void | |
1254 | linux_nat_switch_fork (ptid_t new_ptid) | |
1255 | { | |
1256 | struct lwp_info *lp; | |
1257 | ||
2277426b PA |
1258 | purge_lwp_list (GET_PID (inferior_ptid)); |
1259 | ||
f973ed9c DJ |
1260 | lp = add_lwp (new_ptid); |
1261 | lp->stopped = 1; | |
e26af52f | 1262 | |
2277426b PA |
1263 | /* This changes the thread's ptid while preserving the gdb thread |
1264 | num. Also changes the inferior pid, while preserving the | |
1265 | inferior num. */ | |
1266 | thread_change_ptid (inferior_ptid, new_ptid); | |
1267 | ||
1268 | /* We've just told GDB core that the thread changed target id, but, | |
1269 | in fact, it really is a different thread, with different register | |
1270 | contents. */ | |
1271 | registers_changed (); | |
e26af52f DJ |
1272 | } |
1273 | ||
e26af52f DJ |
1274 | /* Handle the exit of a single thread LP. */ |
1275 | ||
1276 | static void | |
1277 | exit_lwp (struct lwp_info *lp) | |
1278 | { | |
e09875d4 | 1279 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1280 | |
1281 | if (th) | |
e26af52f | 1282 | { |
17faa917 DJ |
1283 | if (print_thread_events) |
1284 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1285 | ||
4f8d22e3 | 1286 | delete_thread (lp->ptid); |
e26af52f DJ |
1287 | } |
1288 | ||
1289 | delete_lwp (lp->ptid); | |
1290 | } | |
1291 | ||
4d062f1a PA |
1292 | /* Return an lwp's tgid, found in `/proc/PID/status'. */ |
1293 | ||
1294 | int | |
1295 | linux_proc_get_tgid (int lwpid) | |
1296 | { | |
1297 | FILE *status_file; | |
1298 | char buf[100]; | |
1299 | int tgid = -1; | |
1300 | ||
1301 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); | |
1302 | status_file = fopen (buf, "r"); | |
1303 | if (status_file != NULL) | |
1304 | { | |
1305 | while (fgets (buf, sizeof (buf), status_file)) | |
1306 | { | |
1307 | if (strncmp (buf, "Tgid:", 5) == 0) | |
1308 | { | |
1309 | tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10); | |
1310 | break; | |
1311 | } | |
1312 | } | |
1313 | ||
1314 | fclose (status_file); | |
1315 | } | |
1316 | ||
1317 | return tgid; | |
1318 | } | |
1319 | ||
a0ef4274 DJ |
1320 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1321 | Other states including `T (tracing stop)' are reported as false. */ | |
1322 | ||
1323 | static int | |
1324 | pid_is_stopped (pid_t pid) | |
1325 | { | |
1326 | FILE *status_file; | |
1327 | char buf[100]; | |
1328 | int retval = 0; | |
1329 | ||
1330 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1331 | status_file = fopen (buf, "r"); | |
1332 | if (status_file != NULL) | |
1333 | { | |
1334 | int have_state = 0; | |
1335 | ||
1336 | while (fgets (buf, sizeof (buf), status_file)) | |
1337 | { | |
1338 | if (strncmp (buf, "State:", 6) == 0) | |
1339 | { | |
1340 | have_state = 1; | |
1341 | break; | |
1342 | } | |
1343 | } | |
1344 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1345 | retval = 1; | |
1346 | fclose (status_file); | |
1347 | } | |
1348 | return retval; | |
1349 | } | |
1350 | ||
1351 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1352 | Returns a wait status for that LWP, to cache. */ | |
1353 | ||
1354 | static int | |
1355 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1356 | int *signalled) | |
1357 | { | |
1358 | pid_t new_pid, pid = GET_LWP (ptid); | |
1359 | int status; | |
1360 | ||
1361 | if (pid_is_stopped (pid)) | |
1362 | { | |
1363 | if (debug_linux_nat) | |
1364 | fprintf_unfiltered (gdb_stdlog, | |
1365 | "LNPAW: Attaching to a stopped process\n"); | |
1366 | ||
1367 | /* The process is definitely stopped. It is in a job control | |
1368 | stop, unless the kernel predates the TASK_STOPPED / | |
1369 | TASK_TRACED distinction, in which case it might be in a | |
1370 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1371 | can kill it, signal it, et cetera. | |
1372 | ||
1373 | First make sure there is a pending SIGSTOP. Since we are | |
1374 | already attached, the process can not transition from stopped | |
1375 | to running without a PTRACE_CONT; so we know this signal will | |
1376 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1377 | probably already in the queue (unless this kernel is old | |
1378 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1379 | is not an RT signal, it can only be queued once. */ | |
1380 | kill_lwp (pid, SIGSTOP); | |
1381 | ||
1382 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1383 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1384 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1385 | } | |
1386 | ||
1387 | /* Make sure the initial process is stopped. The user-level threads | |
1388 | layer might want to poke around in the inferior, and that won't | |
1389 | work if things haven't stabilized yet. */ | |
1390 | new_pid = my_waitpid (pid, &status, 0); | |
1391 | if (new_pid == -1 && errno == ECHILD) | |
1392 | { | |
1393 | if (first) | |
1394 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1395 | ||
1396 | /* Try again with __WCLONE to check cloned processes. */ | |
1397 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1398 | *cloned = 1; | |
1399 | } | |
1400 | ||
dacc9cb2 PP |
1401 | gdb_assert (pid == new_pid); |
1402 | ||
1403 | if (!WIFSTOPPED (status)) | |
1404 | { | |
1405 | /* The pid we tried to attach has apparently just exited. */ | |
1406 | if (debug_linux_nat) | |
1407 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1408 | pid, status_to_str (status)); | |
1409 | return status; | |
1410 | } | |
a0ef4274 DJ |
1411 | |
1412 | if (WSTOPSIG (status) != SIGSTOP) | |
1413 | { | |
1414 | *signalled = 1; | |
1415 | if (debug_linux_nat) | |
1416 | fprintf_unfiltered (gdb_stdlog, | |
1417 | "LNPAW: Received %s after attaching\n", | |
1418 | status_to_str (status)); | |
1419 | } | |
1420 | ||
1421 | return status; | |
1422 | } | |
1423 | ||
1424 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1425 | if the new LWP could not be attached. */ | |
d6b0e80f | 1426 | |
9ee57c33 | 1427 | int |
93815fbf | 1428 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1429 | { |
9ee57c33 | 1430 | struct lwp_info *lp; |
7feb7d06 | 1431 | sigset_t prev_mask; |
d6b0e80f AC |
1432 | |
1433 | gdb_assert (is_lwp (ptid)); | |
1434 | ||
7feb7d06 | 1435 | block_child_signals (&prev_mask); |
d6b0e80f | 1436 | |
9ee57c33 | 1437 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1438 | |
1439 | /* We assume that we're already attached to any LWP that has an id | |
1440 | equal to the overall process id, and to any LWP that is already | |
1441 | in our list of LWPs. If we're not seeing exit events from threads | |
1442 | and we've had PID wraparound since we last tried to stop all threads, | |
1443 | this assumption might be wrong; fortunately, this is very unlikely | |
1444 | to happen. */ | |
9ee57c33 | 1445 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1446 | { |
a0ef4274 | 1447 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1448 | |
1449 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1450 | { |
1451 | /* If we fail to attach to the thread, issue a warning, | |
1452 | but continue. One way this can happen is if thread | |
e9efe249 | 1453 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1454 | bug may place threads in the thread list and then fail |
1455 | to create them. */ | |
1456 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1457 | safe_strerror (errno)); | |
7feb7d06 | 1458 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1459 | return -1; |
1460 | } | |
1461 | ||
d6b0e80f AC |
1462 | if (debug_linux_nat) |
1463 | fprintf_unfiltered (gdb_stdlog, | |
1464 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1465 | target_pid_to_str (ptid)); | |
1466 | ||
a0ef4274 | 1467 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
dacc9cb2 | 1468 | if (!WIFSTOPPED (status)) |
673c2bbe DE |
1469 | { |
1470 | restore_child_signals_mask (&prev_mask); | |
1471 | return -1; | |
1472 | } | |
dacc9cb2 | 1473 | |
a0ef4274 DJ |
1474 | lp = add_lwp (ptid); |
1475 | lp->stopped = 1; | |
1476 | lp->cloned = cloned; | |
1477 | lp->signalled = signalled; | |
1478 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1479 | { |
a0ef4274 DJ |
1480 | lp->resumed = 1; |
1481 | lp->status = status; | |
d6b0e80f AC |
1482 | } |
1483 | ||
a0ef4274 | 1484 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1485 | |
1486 | if (debug_linux_nat) | |
1487 | { | |
1488 | fprintf_unfiltered (gdb_stdlog, | |
1489 | "LLAL: waitpid %s received %s\n", | |
1490 | target_pid_to_str (ptid), | |
1491 | status_to_str (status)); | |
1492 | } | |
1493 | } | |
1494 | else | |
1495 | { | |
1496 | /* We assume that the LWP representing the original process is | |
1497 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1498 | that the GNU/linux ptrace layer uses to keep track of |
1499 | threads. Note that this won't have already been done since | |
1500 | the main thread will have, we assume, been stopped by an | |
1501 | attach from a different layer. */ | |
9ee57c33 DJ |
1502 | if (lp == NULL) |
1503 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1504 | lp->stopped = 1; |
1505 | } | |
9ee57c33 | 1506 | |
7feb7d06 | 1507 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1508 | return 0; |
d6b0e80f AC |
1509 | } |
1510 | ||
b84876c2 | 1511 | static void |
136d6dae VP |
1512 | linux_nat_create_inferior (struct target_ops *ops, |
1513 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1514 | int from_tty) |
1515 | { | |
10568435 JK |
1516 | #ifdef HAVE_PERSONALITY |
1517 | int personality_orig = 0, personality_set = 0; | |
1518 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1519 | |
1520 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1521 | we have to mask the async mode. */ | |
1522 | ||
10568435 JK |
1523 | #ifdef HAVE_PERSONALITY |
1524 | if (disable_randomization) | |
1525 | { | |
1526 | errno = 0; | |
1527 | personality_orig = personality (0xffffffff); | |
1528 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1529 | { | |
1530 | personality_set = 1; | |
1531 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1532 | } | |
1533 | if (errno != 0 || (personality_set | |
1534 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1535 | warning (_("Error disabling address space randomization: %s"), | |
1536 | safe_strerror (errno)); | |
1537 | } | |
1538 | #endif /* HAVE_PERSONALITY */ | |
1539 | ||
2455069d UW |
1540 | /* Make sure we report all signals during startup. */ |
1541 | linux_nat_pass_signals (0, NULL); | |
1542 | ||
136d6dae | 1543 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1544 | |
10568435 JK |
1545 | #ifdef HAVE_PERSONALITY |
1546 | if (personality_set) | |
1547 | { | |
1548 | errno = 0; | |
1549 | personality (personality_orig); | |
1550 | if (errno != 0) | |
1551 | warning (_("Error restoring address space randomization: %s"), | |
1552 | safe_strerror (errno)); | |
1553 | } | |
1554 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1555 | } |
1556 | ||
d6b0e80f | 1557 | static void |
136d6dae | 1558 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1559 | { |
1560 | struct lwp_info *lp; | |
d6b0e80f | 1561 | int status; |
af990527 | 1562 | ptid_t ptid; |
d6b0e80f | 1563 | |
2455069d UW |
1564 | /* Make sure we report all signals during attach. */ |
1565 | linux_nat_pass_signals (0, NULL); | |
1566 | ||
136d6dae | 1567 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1568 | |
af990527 PA |
1569 | /* The ptrace base target adds the main thread with (pid,0,0) |
1570 | format. Decorate it with lwp info. */ | |
1571 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1572 | thread_change_ptid (inferior_ptid, ptid); | |
1573 | ||
9f0bdab8 | 1574 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1575 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1576 | |
1577 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1578 | &lp->signalled); | |
dacc9cb2 PP |
1579 | if (!WIFSTOPPED (status)) |
1580 | { | |
1581 | if (WIFEXITED (status)) | |
1582 | { | |
1583 | int exit_code = WEXITSTATUS (status); | |
1584 | ||
1585 | target_terminal_ours (); | |
1586 | target_mourn_inferior (); | |
1587 | if (exit_code == 0) | |
1588 | error (_("Unable to attach: program exited normally.")); | |
1589 | else | |
1590 | error (_("Unable to attach: program exited with code %d."), | |
1591 | exit_code); | |
1592 | } | |
1593 | else if (WIFSIGNALED (status)) | |
1594 | { | |
1595 | enum target_signal signo; | |
1596 | ||
1597 | target_terminal_ours (); | |
1598 | target_mourn_inferior (); | |
1599 | ||
1600 | signo = target_signal_from_host (WTERMSIG (status)); | |
1601 | error (_("Unable to attach: program terminated with signal " | |
1602 | "%s, %s."), | |
1603 | target_signal_to_name (signo), | |
1604 | target_signal_to_string (signo)); | |
1605 | } | |
1606 | ||
1607 | internal_error (__FILE__, __LINE__, | |
1608 | _("unexpected status %d for PID %ld"), | |
1609 | status, (long) GET_LWP (ptid)); | |
1610 | } | |
1611 | ||
a0ef4274 | 1612 | lp->stopped = 1; |
9f0bdab8 | 1613 | |
a0ef4274 | 1614 | /* Save the wait status to report later. */ |
d6b0e80f | 1615 | lp->resumed = 1; |
a0ef4274 DJ |
1616 | if (debug_linux_nat) |
1617 | fprintf_unfiltered (gdb_stdlog, | |
1618 | "LNA: waitpid %ld, saving status %s\n", | |
1619 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1620 | |
7feb7d06 PA |
1621 | lp->status = status; |
1622 | ||
1623 | if (target_can_async_p ()) | |
1624 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1625 | } |
1626 | ||
a0ef4274 DJ |
1627 | /* Get pending status of LP. */ |
1628 | static int | |
1629 | get_pending_status (struct lwp_info *lp, int *status) | |
1630 | { | |
ca2163eb PA |
1631 | enum target_signal signo = TARGET_SIGNAL_0; |
1632 | ||
1633 | /* If we paused threads momentarily, we may have stored pending | |
1634 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1635 | and GDB core hasn't seen any signal for those threads. | |
1636 | Otherwise, the last signal reported to the core is found in the | |
1637 | thread object's stop_signal. | |
1638 | ||
1639 | There's a corner case that isn't handled here at present. Only | |
1640 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1641 | stop_signal make sense as a real signal to pass to the inferior. | |
1642 | Some catchpoint related events, like | |
1643 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
1644 | to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But, | |
1645 | those traps are debug API (ptrace in our case) related and | |
1646 | induced; the inferior wouldn't see them if it wasn't being | |
1647 | traced. Hence, we should never pass them to the inferior, even | |
1648 | when set to pass state. Since this corner case isn't handled by | |
1649 | infrun.c when proceeding with a signal, for consistency, neither | |
1650 | do we handle it here (or elsewhere in the file we check for | |
1651 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1652 | this is really a corner case. */ | |
1653 | ||
1654 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
1655 | signo = TARGET_SIGNAL_0; /* a pending ptrace event, not a real signal. */ | |
1656 | else if (lp->status) | |
1657 | signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1658 | else if (non_stop && !is_executing (lp->ptid)) | |
1659 | { | |
1660 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
e0881a8e | 1661 | |
16c381f0 | 1662 | signo = tp->suspend.stop_signal; |
ca2163eb PA |
1663 | } |
1664 | else if (!non_stop) | |
a0ef4274 | 1665 | { |
ca2163eb PA |
1666 | struct target_waitstatus last; |
1667 | ptid_t last_ptid; | |
4c28f408 | 1668 | |
ca2163eb | 1669 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1670 | |
ca2163eb PA |
1671 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) |
1672 | { | |
e09875d4 | 1673 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
e0881a8e | 1674 | |
16c381f0 | 1675 | signo = tp->suspend.stop_signal; |
4c28f408 | 1676 | } |
ca2163eb | 1677 | } |
4c28f408 | 1678 | |
ca2163eb | 1679 | *status = 0; |
4c28f408 | 1680 | |
ca2163eb PA |
1681 | if (signo == TARGET_SIGNAL_0) |
1682 | { | |
1683 | if (debug_linux_nat) | |
1684 | fprintf_unfiltered (gdb_stdlog, | |
1685 | "GPT: lwp %s has no pending signal\n", | |
1686 | target_pid_to_str (lp->ptid)); | |
1687 | } | |
1688 | else if (!signal_pass_state (signo)) | |
1689 | { | |
1690 | if (debug_linux_nat) | |
3e43a32a MS |
1691 | fprintf_unfiltered (gdb_stdlog, |
1692 | "GPT: lwp %s had signal %s, " | |
1693 | "but it is in no pass state\n", | |
ca2163eb PA |
1694 | target_pid_to_str (lp->ptid), |
1695 | target_signal_to_string (signo)); | |
a0ef4274 | 1696 | } |
a0ef4274 | 1697 | else |
4c28f408 | 1698 | { |
ca2163eb PA |
1699 | *status = W_STOPCODE (target_signal_to_host (signo)); |
1700 | ||
1701 | if (debug_linux_nat) | |
1702 | fprintf_unfiltered (gdb_stdlog, | |
1703 | "GPT: lwp %s has pending signal %s\n", | |
1704 | target_pid_to_str (lp->ptid), | |
1705 | target_signal_to_string (signo)); | |
4c28f408 | 1706 | } |
a0ef4274 DJ |
1707 | |
1708 | return 0; | |
1709 | } | |
1710 | ||
d6b0e80f AC |
1711 | static int |
1712 | detach_callback (struct lwp_info *lp, void *data) | |
1713 | { | |
1714 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1715 | ||
1716 | if (debug_linux_nat && lp->status) | |
1717 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1718 | strsignal (WSTOPSIG (lp->status)), | |
1719 | target_pid_to_str (lp->ptid)); | |
1720 | ||
a0ef4274 DJ |
1721 | /* If there is a pending SIGSTOP, get rid of it. */ |
1722 | if (lp->signalled) | |
d6b0e80f | 1723 | { |
d6b0e80f AC |
1724 | if (debug_linux_nat) |
1725 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1726 | "DC: Sending SIGCONT to %s\n", |
1727 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1728 | |
a0ef4274 | 1729 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1730 | lp->signalled = 0; |
d6b0e80f AC |
1731 | } |
1732 | ||
1733 | /* We don't actually detach from the LWP that has an id equal to the | |
1734 | overall process id just yet. */ | |
1735 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1736 | { | |
a0ef4274 DJ |
1737 | int status = 0; |
1738 | ||
1739 | /* Pass on any pending signal for this LWP. */ | |
1740 | get_pending_status (lp, &status); | |
1741 | ||
d6b0e80f AC |
1742 | errno = 0; |
1743 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1744 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1745 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1746 | safe_strerror (errno)); |
1747 | ||
1748 | if (debug_linux_nat) | |
1749 | fprintf_unfiltered (gdb_stdlog, | |
1750 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1751 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1752 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1753 | |
1754 | delete_lwp (lp->ptid); | |
1755 | } | |
1756 | ||
1757 | return 0; | |
1758 | } | |
1759 | ||
1760 | static void | |
136d6dae | 1761 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1762 | { |
b84876c2 | 1763 | int pid; |
a0ef4274 | 1764 | int status; |
d90e17a7 PA |
1765 | struct lwp_info *main_lwp; |
1766 | ||
1767 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1768 | |
b84876c2 PA |
1769 | if (target_can_async_p ()) |
1770 | linux_nat_async (NULL, 0); | |
1771 | ||
4c28f408 PA |
1772 | /* Stop all threads before detaching. ptrace requires that the |
1773 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1774 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1775 | /* ... and wait until all of them have reported back that |
1776 | they're no longer running. */ | |
d90e17a7 | 1777 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1778 | |
d90e17a7 | 1779 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1780 | |
1781 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1782 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1783 | ||
1784 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1785 | |
a0ef4274 DJ |
1786 | /* Pass on any pending signal for the last LWP. */ |
1787 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1788 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1789 | && WIFSTOPPED (status)) |
1790 | { | |
1791 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1792 | pass it along with PTRACE_DETACH. */ | |
1793 | args = alloca (8); | |
1794 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
ddabfc73 TT |
1795 | if (debug_linux_nat) |
1796 | fprintf_unfiltered (gdb_stdlog, | |
1797 | "LND: Sending signal %s to %s\n", | |
1798 | args, | |
1799 | target_pid_to_str (main_lwp->ptid)); | |
a0ef4274 DJ |
1800 | } |
1801 | ||
d90e17a7 | 1802 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1803 | |
7a7d3353 PA |
1804 | if (forks_exist_p ()) |
1805 | { | |
1806 | /* Multi-fork case. The current inferior_ptid is being detached | |
1807 | from, but there are other viable forks to debug. Detach from | |
1808 | the current fork, and context-switch to the first | |
1809 | available. */ | |
1810 | linux_fork_detach (args, from_tty); | |
1811 | ||
1812 | if (non_stop && target_can_async_p ()) | |
1813 | target_async (inferior_event_handler, 0); | |
1814 | } | |
1815 | else | |
1816 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1817 | } |
1818 | ||
1819 | /* Resume LP. */ | |
1820 | ||
1821 | static int | |
1822 | resume_callback (struct lwp_info *lp, void *data) | |
1823 | { | |
6c95b8df PA |
1824 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
1825 | ||
1826 | if (lp->stopped && inf->vfork_child != NULL) | |
1827 | { | |
1828 | if (debug_linux_nat) | |
1829 | fprintf_unfiltered (gdb_stdlog, | |
1830 | "RC: Not resuming %s (vfork parent)\n", | |
1831 | target_pid_to_str (lp->ptid)); | |
1832 | } | |
1833 | else if (lp->stopped && lp->status == 0) | |
d6b0e80f | 1834 | { |
d90e17a7 PA |
1835 | if (debug_linux_nat) |
1836 | fprintf_unfiltered (gdb_stdlog, | |
a289b8f6 | 1837 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", |
d90e17a7 PA |
1838 | target_pid_to_str (lp->ptid)); |
1839 | ||
28439f5e PA |
1840 | linux_ops->to_resume (linux_ops, |
1841 | pid_to_ptid (GET_LWP (lp->ptid)), | |
a289b8f6 | 1842 | 0, TARGET_SIGNAL_0); |
d6b0e80f AC |
1843 | if (debug_linux_nat) |
1844 | fprintf_unfiltered (gdb_stdlog, | |
a289b8f6 | 1845 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", |
d6b0e80f AC |
1846 | target_pid_to_str (lp->ptid)); |
1847 | lp->stopped = 0; | |
a289b8f6 | 1848 | lp->step = 0; |
9f0bdab8 | 1849 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 1850 | lp->stopped_by_watchpoint = 0; |
d6b0e80f | 1851 | } |
57380f4e | 1852 | else if (lp->stopped && debug_linux_nat) |
3e43a32a MS |
1853 | fprintf_unfiltered (gdb_stdlog, |
1854 | "RC: Not resuming sibling %s (has pending)\n", | |
57380f4e DJ |
1855 | target_pid_to_str (lp->ptid)); |
1856 | else if (debug_linux_nat) | |
3e43a32a MS |
1857 | fprintf_unfiltered (gdb_stdlog, |
1858 | "RC: Not resuming sibling %s (not stopped)\n", | |
57380f4e | 1859 | target_pid_to_str (lp->ptid)); |
d6b0e80f AC |
1860 | |
1861 | return 0; | |
1862 | } | |
1863 | ||
1864 | static int | |
1865 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1866 | { | |
1867 | lp->resumed = 0; | |
1868 | return 0; | |
1869 | } | |
1870 | ||
1871 | static int | |
1872 | resume_set_callback (struct lwp_info *lp, void *data) | |
1873 | { | |
1874 | lp->resumed = 1; | |
1875 | return 0; | |
1876 | } | |
1877 | ||
1878 | static void | |
28439f5e PA |
1879 | linux_nat_resume (struct target_ops *ops, |
1880 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1881 | { |
7feb7d06 | 1882 | sigset_t prev_mask; |
d6b0e80f | 1883 | struct lwp_info *lp; |
d90e17a7 | 1884 | int resume_many; |
d6b0e80f | 1885 | |
76f50ad1 DJ |
1886 | if (debug_linux_nat) |
1887 | fprintf_unfiltered (gdb_stdlog, | |
1888 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1889 | step ? "step" : "resume", | |
1890 | target_pid_to_str (ptid), | |
423ec54c JK |
1891 | (signo != TARGET_SIGNAL_0 |
1892 | ? strsignal (target_signal_to_host (signo)) : "0"), | |
76f50ad1 DJ |
1893 | target_pid_to_str (inferior_ptid)); |
1894 | ||
7feb7d06 | 1895 | block_child_signals (&prev_mask); |
b84876c2 | 1896 | |
d6b0e80f | 1897 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1898 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1899 | || ptid_is_pid (ptid)); | |
4c28f408 | 1900 | |
e3e9f5a2 PA |
1901 | /* Mark the lwps we're resuming as resumed. */ |
1902 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
d6b0e80f | 1903 | |
d90e17a7 PA |
1904 | /* See if it's the current inferior that should be handled |
1905 | specially. */ | |
1906 | if (resume_many) | |
1907 | lp = find_lwp_pid (inferior_ptid); | |
1908 | else | |
1909 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1910 | gdb_assert (lp != NULL); |
d6b0e80f | 1911 | |
9f0bdab8 DJ |
1912 | /* Remember if we're stepping. */ |
1913 | lp->step = step; | |
d6b0e80f | 1914 | |
9f0bdab8 DJ |
1915 | /* If we have a pending wait status for this thread, there is no |
1916 | point in resuming the process. But first make sure that | |
1917 | linux_nat_wait won't preemptively handle the event - we | |
1918 | should never take this short-circuit if we are going to | |
1919 | leave LP running, since we have skipped resuming all the | |
1920 | other threads. This bit of code needs to be synchronized | |
1921 | with linux_nat_wait. */ | |
76f50ad1 | 1922 | |
9f0bdab8 DJ |
1923 | if (lp->status && WIFSTOPPED (lp->status)) |
1924 | { | |
2455069d UW |
1925 | if (!lp->step |
1926 | && WSTOPSIG (lp->status) | |
1927 | && sigismember (&pass_mask, WSTOPSIG (lp->status))) | |
d6b0e80f | 1928 | { |
9f0bdab8 DJ |
1929 | if (debug_linux_nat) |
1930 | fprintf_unfiltered (gdb_stdlog, | |
1931 | "LLR: Not short circuiting for ignored " | |
1932 | "status 0x%x\n", lp->status); | |
1933 | ||
d6b0e80f AC |
1934 | /* FIXME: What should we do if we are supposed to continue |
1935 | this thread with a signal? */ | |
1936 | gdb_assert (signo == TARGET_SIGNAL_0); | |
2455069d | 1937 | signo = target_signal_from_host (WSTOPSIG (lp->status)); |
9f0bdab8 DJ |
1938 | lp->status = 0; |
1939 | } | |
1940 | } | |
76f50ad1 | 1941 | |
6c95b8df | 1942 | if (lp->status || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
9f0bdab8 DJ |
1943 | { |
1944 | /* FIXME: What should we do if we are supposed to continue | |
1945 | this thread with a signal? */ | |
1946 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1947 | |
9f0bdab8 DJ |
1948 | if (debug_linux_nat) |
1949 | fprintf_unfiltered (gdb_stdlog, | |
1950 | "LLR: Short circuiting for status 0x%x\n", | |
1951 | lp->status); | |
d6b0e80f | 1952 | |
7feb7d06 PA |
1953 | restore_child_signals_mask (&prev_mask); |
1954 | if (target_can_async_p ()) | |
1955 | { | |
1956 | target_async (inferior_event_handler, 0); | |
1957 | /* Tell the event loop we have something to process. */ | |
1958 | async_file_mark (); | |
1959 | } | |
9f0bdab8 | 1960 | return; |
d6b0e80f AC |
1961 | } |
1962 | ||
9f0bdab8 DJ |
1963 | /* Mark LWP as not stopped to prevent it from being continued by |
1964 | resume_callback. */ | |
1965 | lp->stopped = 0; | |
1966 | ||
d90e17a7 PA |
1967 | if (resume_many) |
1968 | iterate_over_lwps (ptid, resume_callback, NULL); | |
1969 | ||
1970 | /* Convert to something the lower layer understands. */ | |
1971 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 1972 | |
28439f5e | 1973 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 | 1974 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 1975 | lp->stopped_by_watchpoint = 0; |
9f0bdab8 | 1976 | |
d6b0e80f AC |
1977 | if (debug_linux_nat) |
1978 | fprintf_unfiltered (gdb_stdlog, | |
1979 | "LLR: %s %s, %s (resume event thread)\n", | |
1980 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1981 | target_pid_to_str (ptid), | |
423ec54c JK |
1982 | (signo != TARGET_SIGNAL_0 |
1983 | ? strsignal (target_signal_to_host (signo)) : "0")); | |
b84876c2 | 1984 | |
7feb7d06 | 1985 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 1986 | if (target_can_async_p ()) |
8ea051c5 | 1987 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1988 | } |
1989 | ||
c5f62d5f | 1990 | /* Send a signal to an LWP. */ |
d6b0e80f AC |
1991 | |
1992 | static int | |
1993 | kill_lwp (int lwpid, int signo) | |
1994 | { | |
c5f62d5f DE |
1995 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1996 | fails, then we are not using nptl threads and we should be using kill. */ | |
d6b0e80f AC |
1997 | |
1998 | #ifdef HAVE_TKILL_SYSCALL | |
c5f62d5f DE |
1999 | { |
2000 | static int tkill_failed; | |
2001 | ||
2002 | if (!tkill_failed) | |
2003 | { | |
2004 | int ret; | |
2005 | ||
2006 | errno = 0; | |
2007 | ret = syscall (__NR_tkill, lwpid, signo); | |
2008 | if (errno != ENOSYS) | |
2009 | return ret; | |
2010 | tkill_failed = 1; | |
2011 | } | |
2012 | } | |
d6b0e80f AC |
2013 | #endif |
2014 | ||
2015 | return kill (lwpid, signo); | |
2016 | } | |
2017 | ||
ca2163eb PA |
2018 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
2019 | event, check if the core is interested in it: if not, ignore the | |
2020 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
2021 | syscall entry/exit status, since the ptrace event itself doesn't | |
2022 | indicate it, and report the trap to higher layers. */ | |
2023 | ||
2024 | static int | |
2025 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
2026 | { | |
2027 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2028 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
2029 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2030 | ||
2031 | if (stopping) | |
2032 | { | |
2033 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
2034 | makes it so that the LWP reports an immediate syscall return, | |
2035 | followed by the SIGSTOP. Skip seeing that "return" using | |
2036 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
2037 | SIGSTOP. Later when the thread is resumed, a new syscall | |
2038 | entry event. If we didn't do this (and returned 0), we'd | |
2039 | leave a syscall entry pending, and our caller, by using | |
2040 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
2041 | itself. Later, when the user re-resumes this LWP, we'd see | |
2042 | another syscall entry event and we'd mistake it for a return. | |
2043 | ||
2044 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
2045 | (leaving immediately with LWP->signalled set, without issuing | |
2046 | a PTRACE_CONT), it would still be problematic to leave this | |
2047 | syscall enter pending, as later when the thread is resumed, | |
2048 | it would then see the same syscall exit mentioned above, | |
2049 | followed by the delayed SIGSTOP, while the syscall didn't | |
2050 | actually get to execute. It seems it would be even more | |
2051 | confusing to the user. */ | |
2052 | ||
2053 | if (debug_linux_nat) | |
2054 | fprintf_unfiltered (gdb_stdlog, | |
2055 | "LHST: ignoring syscall %d " | |
2056 | "for LWP %ld (stopping threads), " | |
2057 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
2058 | syscall_number, | |
2059 | GET_LWP (lp->ptid)); | |
2060 | ||
2061 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2062 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2063 | return 1; | |
2064 | } | |
2065 | ||
2066 | if (catch_syscall_enabled ()) | |
2067 | { | |
2068 | /* Always update the entry/return state, even if this particular | |
2069 | syscall isn't interesting to the core now. In async mode, | |
2070 | the user could install a new catchpoint for this syscall | |
2071 | between syscall enter/return, and we'll need to know to | |
2072 | report a syscall return if that happens. */ | |
2073 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2074 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2075 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2076 | ||
2077 | if (catching_syscall_number (syscall_number)) | |
2078 | { | |
2079 | /* Alright, an event to report. */ | |
2080 | ourstatus->kind = lp->syscall_state; | |
2081 | ourstatus->value.syscall_number = syscall_number; | |
2082 | ||
2083 | if (debug_linux_nat) | |
2084 | fprintf_unfiltered (gdb_stdlog, | |
2085 | "LHST: stopping for %s of syscall %d" | |
2086 | " for LWP %ld\n", | |
3e43a32a MS |
2087 | lp->syscall_state |
2088 | == TARGET_WAITKIND_SYSCALL_ENTRY | |
ca2163eb PA |
2089 | ? "entry" : "return", |
2090 | syscall_number, | |
2091 | GET_LWP (lp->ptid)); | |
2092 | return 0; | |
2093 | } | |
2094 | ||
2095 | if (debug_linux_nat) | |
2096 | fprintf_unfiltered (gdb_stdlog, | |
2097 | "LHST: ignoring %s of syscall %d " | |
2098 | "for LWP %ld\n", | |
2099 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2100 | ? "entry" : "return", | |
2101 | syscall_number, | |
2102 | GET_LWP (lp->ptid)); | |
2103 | } | |
2104 | else | |
2105 | { | |
2106 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
2107 | before on this LWP, it could happen that the user removes all | |
2108 | syscall catchpoints before we get to process this event. | |
2109 | There are two noteworthy issues here: | |
2110 | ||
2111 | - When stopped at a syscall entry event, resuming with | |
2112 | PT_STEP still resumes executing the syscall and reports a | |
2113 | syscall return. | |
2114 | ||
2115 | - Only PT_SYSCALL catches syscall enters. If we last | |
2116 | single-stepped this thread, then this event can't be a | |
2117 | syscall enter. If we last single-stepped this thread, this | |
2118 | has to be a syscall exit. | |
2119 | ||
2120 | The points above mean that the next resume, be it PT_STEP or | |
2121 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
2122 | if (debug_linux_nat) | |
2123 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2124 | "LHST: caught syscall event " |
2125 | "with no syscall catchpoints." | |
ca2163eb PA |
2126 | " %d for LWP %ld, ignoring\n", |
2127 | syscall_number, | |
2128 | GET_LWP (lp->ptid)); | |
2129 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2130 | } | |
2131 | ||
2132 | /* The core isn't interested in this event. For efficiency, avoid | |
2133 | stopping all threads only to have the core resume them all again. | |
2134 | Since we're not stopping threads, if we're still syscall tracing | |
2135 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
2136 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
2137 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
2138 | ||
2139 | /* Note that gdbarch_get_syscall_number may access registers, hence | |
2140 | fill a regcache. */ | |
2141 | registers_changed (); | |
2142 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
2143 | lp->step, TARGET_SIGNAL_0); | |
2144 | return 1; | |
2145 | } | |
2146 | ||
3d799a95 DJ |
2147 | /* Handle a GNU/Linux extended wait response. If we see a clone |
2148 | event, we need to add the new LWP to our list (and not report the | |
2149 | trap to higher layers). This function returns non-zero if the | |
2150 | event should be ignored and we should wait again. If STOPPING is | |
2151 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
2152 | |
2153 | static int | |
3d799a95 DJ |
2154 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
2155 | int stopping) | |
d6b0e80f | 2156 | { |
3d799a95 DJ |
2157 | int pid = GET_LWP (lp->ptid); |
2158 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
3d799a95 | 2159 | int event = status >> 16; |
d6b0e80f | 2160 | |
3d799a95 DJ |
2161 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
2162 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 2163 | { |
3d799a95 DJ |
2164 | unsigned long new_pid; |
2165 | int ret; | |
2166 | ||
2167 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 2168 | |
3d799a95 DJ |
2169 | /* If we haven't already seen the new PID stop, wait for it now. */ |
2170 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
2171 | { | |
2172 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
2173 | hits the SIGSTOP, but we're already attached. */ | |
2174 | ret = my_waitpid (new_pid, &status, | |
2175 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
2176 | if (ret == -1) | |
2177 | perror_with_name (_("waiting for new child")); | |
2178 | else if (ret != new_pid) | |
2179 | internal_error (__FILE__, __LINE__, | |
2180 | _("wait returned unexpected PID %d"), ret); | |
2181 | else if (!WIFSTOPPED (status)) | |
2182 | internal_error (__FILE__, __LINE__, | |
2183 | _("wait returned unexpected status 0x%x"), status); | |
2184 | } | |
2185 | ||
3a3e9ee3 | 2186 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2187 | |
2277426b PA |
2188 | if (event == PTRACE_EVENT_FORK |
2189 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
2190 | { | |
2277426b PA |
2191 | /* Handle checkpointing by linux-fork.c here as a special |
2192 | case. We don't want the follow-fork-mode or 'catch fork' | |
2193 | to interfere with this. */ | |
2194 | ||
2195 | /* This won't actually modify the breakpoint list, but will | |
2196 | physically remove the breakpoints from the child. */ | |
2197 | detach_breakpoints (new_pid); | |
2198 | ||
2199 | /* Retain child fork in ptrace (stopped) state. */ | |
14571dad MS |
2200 | if (!find_fork_pid (new_pid)) |
2201 | add_fork (new_pid); | |
2277426b PA |
2202 | |
2203 | /* Report as spurious, so that infrun doesn't want to follow | |
2204 | this fork. We're actually doing an infcall in | |
2205 | linux-fork.c. */ | |
2206 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2207 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
2208 | ||
2209 | /* Report the stop to the core. */ | |
2210 | return 0; | |
2211 | } | |
2212 | ||
3d799a95 DJ |
2213 | if (event == PTRACE_EVENT_FORK) |
2214 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2215 | else if (event == PTRACE_EVENT_VFORK) | |
2216 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 2217 | else |
3d799a95 | 2218 | { |
78768c4a JK |
2219 | struct lwp_info *new_lp; |
2220 | ||
3d799a95 | 2221 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
78768c4a | 2222 | |
d90e17a7 | 2223 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 2224 | new_lp->cloned = 1; |
4c28f408 | 2225 | new_lp->stopped = 1; |
d6b0e80f | 2226 | |
3d799a95 DJ |
2227 | if (WSTOPSIG (status) != SIGSTOP) |
2228 | { | |
2229 | /* This can happen if someone starts sending signals to | |
2230 | the new thread before it gets a chance to run, which | |
2231 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2232 | This is an unlikely case, and harder to handle for | |
2233 | fork / vfork than for clone, so we do not try - but | |
2234 | we handle it for clone events here. We'll send | |
2235 | the other signal on to the thread below. */ | |
2236 | ||
2237 | new_lp->signalled = 1; | |
2238 | } | |
2239 | else | |
2240 | status = 0; | |
d6b0e80f | 2241 | |
4c28f408 | 2242 | if (non_stop) |
3d799a95 | 2243 | { |
4c28f408 PA |
2244 | /* Add the new thread to GDB's lists as soon as possible |
2245 | so that: | |
2246 | ||
2247 | 1) the frontend doesn't have to wait for a stop to | |
2248 | display them, and, | |
2249 | ||
2250 | 2) we tag it with the correct running state. */ | |
2251 | ||
2252 | /* If the thread_db layer is active, let it know about | |
2253 | this new thread, and add it to GDB's list. */ | |
2254 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2255 | { | |
2256 | /* We're not using thread_db. Add it to GDB's | |
2257 | list. */ | |
2258 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2259 | add_thread (new_lp->ptid); | |
2260 | } | |
2261 | ||
2262 | if (!stopping) | |
2263 | { | |
2264 | set_running (new_lp->ptid, 1); | |
2265 | set_executing (new_lp->ptid, 1); | |
2266 | } | |
2267 | } | |
2268 | ||
ca2163eb PA |
2269 | /* Note the need to use the low target ops to resume, to |
2270 | handle resuming with PT_SYSCALL if we have syscall | |
2271 | catchpoints. */ | |
4c28f408 PA |
2272 | if (!stopping) |
2273 | { | |
423ec54c | 2274 | enum target_signal signo; |
ca2163eb | 2275 | |
4c28f408 | 2276 | new_lp->stopped = 0; |
3d799a95 | 2277 | new_lp->resumed = 1; |
ca2163eb PA |
2278 | |
2279 | signo = (status | |
2280 | ? target_signal_from_host (WSTOPSIG (status)) | |
2281 | : TARGET_SIGNAL_0); | |
2282 | ||
2283 | linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid), | |
2284 | 0, signo); | |
3d799a95 | 2285 | } |
ad34eb2f JK |
2286 | else |
2287 | { | |
2288 | if (status != 0) | |
2289 | { | |
2290 | /* We created NEW_LP so it cannot yet contain STATUS. */ | |
2291 | gdb_assert (new_lp->status == 0); | |
2292 | ||
2293 | /* Save the wait status to report later. */ | |
2294 | if (debug_linux_nat) | |
2295 | fprintf_unfiltered (gdb_stdlog, | |
2296 | "LHEW: waitpid of new LWP %ld, " | |
2297 | "saving status %s\n", | |
2298 | (long) GET_LWP (new_lp->ptid), | |
2299 | status_to_str (status)); | |
2300 | new_lp->status = status; | |
2301 | } | |
2302 | } | |
d6b0e80f | 2303 | |
3d799a95 DJ |
2304 | if (debug_linux_nat) |
2305 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2306 | "LHEW: Got clone event " |
2307 | "from LWP %ld, resuming\n", | |
3d799a95 | 2308 | GET_LWP (lp->ptid)); |
ca2163eb PA |
2309 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
2310 | 0, TARGET_SIGNAL_0); | |
3d799a95 DJ |
2311 | |
2312 | return 1; | |
2313 | } | |
2314 | ||
2315 | return 0; | |
d6b0e80f AC |
2316 | } |
2317 | ||
3d799a95 DJ |
2318 | if (event == PTRACE_EVENT_EXEC) |
2319 | { | |
a75724bc PA |
2320 | if (debug_linux_nat) |
2321 | fprintf_unfiltered (gdb_stdlog, | |
2322 | "LHEW: Got exec event from LWP %ld\n", | |
2323 | GET_LWP (lp->ptid)); | |
2324 | ||
3d799a95 DJ |
2325 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2326 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2327 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 | 2328 | |
6c95b8df PA |
2329 | return 0; |
2330 | } | |
2331 | ||
2332 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2333 | { | |
2334 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2335 | { |
6c95b8df | 2336 | if (debug_linux_nat) |
3e43a32a MS |
2337 | fprintf_unfiltered (gdb_stdlog, |
2338 | "LHEW: Got expected PTRACE_EVENT_" | |
2339 | "VFORK_DONE from LWP %ld: stopping\n", | |
6c95b8df | 2340 | GET_LWP (lp->ptid)); |
3d799a95 | 2341 | |
6c95b8df PA |
2342 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2343 | return 0; | |
3d799a95 DJ |
2344 | } |
2345 | ||
6c95b8df | 2346 | if (debug_linux_nat) |
3e43a32a MS |
2347 | fprintf_unfiltered (gdb_stdlog, |
2348 | "LHEW: Got PTRACE_EVENT_VFORK_DONE " | |
2349 | "from LWP %ld: resuming\n", | |
6c95b8df PA |
2350 | GET_LWP (lp->ptid)); |
2351 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2352 | return 1; | |
3d799a95 DJ |
2353 | } |
2354 | ||
2355 | internal_error (__FILE__, __LINE__, | |
2356 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2357 | } |
2358 | ||
432b4d03 JK |
2359 | /* Return non-zero if LWP is a zombie. */ |
2360 | ||
2361 | static int | |
2362 | linux_lwp_is_zombie (long lwp) | |
2363 | { | |
2364 | char buffer[MAXPATHLEN]; | |
2365 | FILE *procfile; | |
2366 | int retval = 0; | |
2367 | ||
07e78767 | 2368 | xsnprintf (buffer, sizeof (buffer), "/proc/%ld/status", lwp); |
432b4d03 JK |
2369 | procfile = fopen (buffer, "r"); |
2370 | if (procfile == NULL) | |
2371 | { | |
2372 | warning (_("unable to open /proc file '%s'"), buffer); | |
2373 | return 0; | |
2374 | } | |
2375 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) | |
2376 | if (strcmp (buffer, "State:\tZ (zombie)\n") == 0) | |
2377 | { | |
2378 | retval = 1; | |
2379 | break; | |
2380 | } | |
2381 | fclose (procfile); | |
2382 | ||
2383 | return retval; | |
2384 | } | |
2385 | ||
d6b0e80f AC |
2386 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has |
2387 | exited. */ | |
2388 | ||
2389 | static int | |
2390 | wait_lwp (struct lwp_info *lp) | |
2391 | { | |
2392 | pid_t pid; | |
432b4d03 | 2393 | int status = 0; |
d6b0e80f | 2394 | int thread_dead = 0; |
432b4d03 | 2395 | sigset_t prev_mask; |
d6b0e80f AC |
2396 | |
2397 | gdb_assert (!lp->stopped); | |
2398 | gdb_assert (lp->status == 0); | |
2399 | ||
432b4d03 JK |
2400 | /* Make sure SIGCHLD is blocked for sigsuspend avoiding a race below. */ |
2401 | block_child_signals (&prev_mask); | |
2402 | ||
2403 | for (;;) | |
d6b0e80f | 2404 | { |
432b4d03 JK |
2405 | /* If my_waitpid returns 0 it means the __WCLONE vs. non-__WCLONE kind |
2406 | was right and we should just call sigsuspend. */ | |
2407 | ||
2408 | pid = my_waitpid (GET_LWP (lp->ptid), &status, WNOHANG); | |
d6b0e80f | 2409 | if (pid == -1 && errno == ECHILD) |
432b4d03 JK |
2410 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE | WNOHANG); |
2411 | if (pid != 0) | |
2412 | break; | |
2413 | ||
2414 | /* Bugs 10970, 12702. | |
2415 | Thread group leader may have exited in which case we'll lock up in | |
2416 | waitpid if there are other threads, even if they are all zombies too. | |
2417 | Basically, we're not supposed to use waitpid this way. | |
2418 | __WCLONE is not applicable for the leader so we can't use that. | |
2419 | LINUX_NAT_THREAD_ALIVE cannot be used here as it requires a STOPPED | |
2420 | process; it gets ESRCH both for the zombie and for running processes. | |
2421 | ||
2422 | As a workaround, check if we're waiting for the thread group leader and | |
2423 | if it's a zombie, and avoid calling waitpid if it is. | |
2424 | ||
2425 | This is racy, what if the tgl becomes a zombie right after we check? | |
2426 | Therefore always use WNOHANG with sigsuspend - it is equivalent to | |
2427 | waiting waitpid but the linux_lwp_is_zombie is safe this way. */ | |
2428 | ||
2429 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid) | |
2430 | && linux_lwp_is_zombie (GET_LWP (lp->ptid))) | |
d6b0e80f | 2431 | { |
d6b0e80f AC |
2432 | thread_dead = 1; |
2433 | if (debug_linux_nat) | |
432b4d03 JK |
2434 | fprintf_unfiltered (gdb_stdlog, |
2435 | "WL: Thread group leader %s vanished.\n", | |
d6b0e80f | 2436 | target_pid_to_str (lp->ptid)); |
432b4d03 | 2437 | break; |
d6b0e80f | 2438 | } |
432b4d03 JK |
2439 | |
2440 | /* Wait for next SIGCHLD and try again. This may let SIGCHLD handlers | |
2441 | get invoked despite our caller had them intentionally blocked by | |
2442 | block_child_signals. This is sensitive only to the loop of | |
2443 | linux_nat_wait_1 and there if we get called my_waitpid gets called | |
2444 | again before it gets to sigsuspend so we can safely let the handlers | |
2445 | get executed here. */ | |
2446 | ||
2447 | sigsuspend (&suspend_mask); | |
2448 | } | |
2449 | ||
2450 | restore_child_signals_mask (&prev_mask); | |
2451 | ||
2452 | if (pid == -1 && errno == ECHILD) | |
2453 | { | |
2454 | /* The thread has previously exited. We need to delete it | |
2455 | now because, for some vendor 2.4 kernels with NPTL | |
2456 | support backported, there won't be an exit event unless | |
2457 | it is the main thread. 2.6 kernels will report an exit | |
2458 | event for each thread that exits, as expected. */ | |
2459 | thread_dead = 1; | |
2460 | if (debug_linux_nat) | |
2461 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2462 | target_pid_to_str (lp->ptid)); | |
d6b0e80f AC |
2463 | } |
2464 | ||
2465 | if (!thread_dead) | |
2466 | { | |
2467 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2468 | ||
2469 | if (debug_linux_nat) | |
2470 | { | |
2471 | fprintf_unfiltered (gdb_stdlog, | |
2472 | "WL: waitpid %s received %s\n", | |
2473 | target_pid_to_str (lp->ptid), | |
2474 | status_to_str (status)); | |
2475 | } | |
2476 | } | |
2477 | ||
2478 | /* Check if the thread has exited. */ | |
2479 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2480 | { | |
2481 | thread_dead = 1; | |
2482 | if (debug_linux_nat) | |
2483 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2484 | target_pid_to_str (lp->ptid)); | |
2485 | } | |
2486 | ||
2487 | if (thread_dead) | |
2488 | { | |
e26af52f | 2489 | exit_lwp (lp); |
d6b0e80f AC |
2490 | return 0; |
2491 | } | |
2492 | ||
2493 | gdb_assert (WIFSTOPPED (status)); | |
2494 | ||
ca2163eb PA |
2495 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2496 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2497 | { | |
2498 | /* No longer need the sysgood bit. The ptrace event ends up | |
2499 | recorded in lp->waitstatus if we care for it. We can carry | |
2500 | on handling the event like a regular SIGTRAP from here | |
2501 | on. */ | |
2502 | status = W_STOPCODE (SIGTRAP); | |
2503 | if (linux_handle_syscall_trap (lp, 1)) | |
2504 | return wait_lwp (lp); | |
2505 | } | |
2506 | ||
d6b0e80f AC |
2507 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
2508 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2509 | { | |
2510 | if (debug_linux_nat) | |
2511 | fprintf_unfiltered (gdb_stdlog, | |
2512 | "WL: Handling extended status 0x%06x\n", | |
2513 | status); | |
3d799a95 | 2514 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2515 | return wait_lwp (lp); |
2516 | } | |
2517 | ||
2518 | return status; | |
2519 | } | |
2520 | ||
9f0bdab8 DJ |
2521 | /* Save the most recent siginfo for LP. This is currently only called |
2522 | for SIGTRAP; some ports use the si_addr field for | |
2523 | target_stopped_data_address. In the future, it may also be used to | |
2524 | restore the siginfo of requeued signals. */ | |
2525 | ||
2526 | static void | |
2527 | save_siginfo (struct lwp_info *lp) | |
2528 | { | |
2529 | errno = 0; | |
2530 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2531 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2532 | ||
2533 | if (errno != 0) | |
2534 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2535 | } | |
2536 | ||
d6b0e80f AC |
2537 | /* Send a SIGSTOP to LP. */ |
2538 | ||
2539 | static int | |
2540 | stop_callback (struct lwp_info *lp, void *data) | |
2541 | { | |
2542 | if (!lp->stopped && !lp->signalled) | |
2543 | { | |
2544 | int ret; | |
2545 | ||
2546 | if (debug_linux_nat) | |
2547 | { | |
2548 | fprintf_unfiltered (gdb_stdlog, | |
2549 | "SC: kill %s **<SIGSTOP>**\n", | |
2550 | target_pid_to_str (lp->ptid)); | |
2551 | } | |
2552 | errno = 0; | |
2553 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2554 | if (debug_linux_nat) | |
2555 | { | |
2556 | fprintf_unfiltered (gdb_stdlog, | |
2557 | "SC: lwp kill %d %s\n", | |
2558 | ret, | |
2559 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2560 | } | |
2561 | ||
2562 | lp->signalled = 1; | |
2563 | gdb_assert (lp->status == 0); | |
2564 | } | |
2565 | ||
2566 | return 0; | |
2567 | } | |
2568 | ||
57380f4e | 2569 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2570 | |
2571 | static int | |
57380f4e DJ |
2572 | linux_nat_has_pending_sigint (int pid) |
2573 | { | |
2574 | sigset_t pending, blocked, ignored; | |
57380f4e DJ |
2575 | |
2576 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2577 | ||
2578 | if (sigismember (&pending, SIGINT) | |
2579 | && !sigismember (&ignored, SIGINT)) | |
2580 | return 1; | |
2581 | ||
2582 | return 0; | |
2583 | } | |
2584 | ||
2585 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2586 | ||
2587 | static int | |
2588 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2589 | { |
57380f4e DJ |
2590 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2591 | flag to consume the next one. */ | |
2592 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2593 | && WSTOPSIG (lp->status) == SIGINT) | |
2594 | lp->status = 0; | |
2595 | else | |
2596 | lp->ignore_sigint = 1; | |
2597 | ||
2598 | return 0; | |
2599 | } | |
2600 | ||
2601 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2602 | This function is called after we know the LWP has stopped; if the LWP | |
2603 | stopped before the expected SIGINT was delivered, then it will never have | |
2604 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2605 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2606 | |
57380f4e DJ |
2607 | static void |
2608 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2609 | { | |
2610 | if (!lp->ignore_sigint) | |
2611 | return; | |
2612 | ||
2613 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2614 | { | |
2615 | if (debug_linux_nat) | |
2616 | fprintf_unfiltered (gdb_stdlog, | |
2617 | "MCIS: Clearing bogus flag for %s\n", | |
2618 | target_pid_to_str (lp->ptid)); | |
2619 | lp->ignore_sigint = 0; | |
2620 | } | |
2621 | } | |
2622 | ||
ebec9a0f PA |
2623 | /* Fetch the possible triggered data watchpoint info and store it in |
2624 | LP. | |
2625 | ||
2626 | On some archs, like x86, that use debug registers to set | |
2627 | watchpoints, it's possible that the way to know which watched | |
2628 | address trapped, is to check the register that is used to select | |
2629 | which address to watch. Problem is, between setting the watchpoint | |
2630 | and reading back which data address trapped, the user may change | |
2631 | the set of watchpoints, and, as a consequence, GDB changes the | |
2632 | debug registers in the inferior. To avoid reading back a stale | |
2633 | stopped-data-address when that happens, we cache in LP the fact | |
2634 | that a watchpoint trapped, and the corresponding data address, as | |
2635 | soon as we see LP stop with a SIGTRAP. If GDB changes the debug | |
2636 | registers meanwhile, we have the cached data we can rely on. */ | |
2637 | ||
2638 | static void | |
2639 | save_sigtrap (struct lwp_info *lp) | |
2640 | { | |
2641 | struct cleanup *old_chain; | |
2642 | ||
2643 | if (linux_ops->to_stopped_by_watchpoint == NULL) | |
2644 | { | |
2645 | lp->stopped_by_watchpoint = 0; | |
2646 | return; | |
2647 | } | |
2648 | ||
2649 | old_chain = save_inferior_ptid (); | |
2650 | inferior_ptid = lp->ptid; | |
2651 | ||
2652 | lp->stopped_by_watchpoint = linux_ops->to_stopped_by_watchpoint (); | |
2653 | ||
2654 | if (lp->stopped_by_watchpoint) | |
2655 | { | |
2656 | if (linux_ops->to_stopped_data_address != NULL) | |
2657 | lp->stopped_data_address_p = | |
2658 | linux_ops->to_stopped_data_address (¤t_target, | |
2659 | &lp->stopped_data_address); | |
2660 | else | |
2661 | lp->stopped_data_address_p = 0; | |
2662 | } | |
2663 | ||
2664 | do_cleanups (old_chain); | |
2665 | } | |
2666 | ||
2667 | /* See save_sigtrap. */ | |
2668 | ||
2669 | static int | |
2670 | linux_nat_stopped_by_watchpoint (void) | |
2671 | { | |
2672 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2673 | ||
2674 | gdb_assert (lp != NULL); | |
2675 | ||
2676 | return lp->stopped_by_watchpoint; | |
2677 | } | |
2678 | ||
2679 | static int | |
2680 | linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) | |
2681 | { | |
2682 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2683 | ||
2684 | gdb_assert (lp != NULL); | |
2685 | ||
2686 | *addr_p = lp->stopped_data_address; | |
2687 | ||
2688 | return lp->stopped_data_address_p; | |
2689 | } | |
2690 | ||
26ab7092 JK |
2691 | /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */ |
2692 | ||
2693 | static int | |
2694 | sigtrap_is_event (int status) | |
2695 | { | |
2696 | return WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP; | |
2697 | } | |
2698 | ||
2699 | /* SIGTRAP-like events recognizer. */ | |
2700 | ||
2701 | static int (*linux_nat_status_is_event) (int status) = sigtrap_is_event; | |
2702 | ||
00390b84 JK |
2703 | /* Check for SIGTRAP-like events in LP. */ |
2704 | ||
2705 | static int | |
2706 | linux_nat_lp_status_is_event (struct lwp_info *lp) | |
2707 | { | |
2708 | /* We check for lp->waitstatus in addition to lp->status, because we can | |
2709 | have pending process exits recorded in lp->status | |
2710 | and W_EXITCODE(0,0) == 0. We should probably have an additional | |
2711 | lp->status_p flag. */ | |
2712 | ||
2713 | return (lp->waitstatus.kind == TARGET_WAITKIND_IGNORE | |
2714 | && linux_nat_status_is_event (lp->status)); | |
2715 | } | |
2716 | ||
26ab7092 JK |
2717 | /* Set alternative SIGTRAP-like events recognizer. If |
2718 | breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be | |
2719 | applied. */ | |
2720 | ||
2721 | void | |
2722 | linux_nat_set_status_is_event (struct target_ops *t, | |
2723 | int (*status_is_event) (int status)) | |
2724 | { | |
2725 | linux_nat_status_is_event = status_is_event; | |
2726 | } | |
2727 | ||
57380f4e DJ |
2728 | /* Wait until LP is stopped. */ |
2729 | ||
2730 | static int | |
2731 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2732 | { | |
6c95b8df PA |
2733 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
2734 | ||
2735 | /* If this is a vfork parent, bail out, it is not going to report | |
2736 | any SIGSTOP until the vfork is done with. */ | |
2737 | if (inf->vfork_child != NULL) | |
2738 | return 0; | |
2739 | ||
d6b0e80f AC |
2740 | if (!lp->stopped) |
2741 | { | |
2742 | int status; | |
2743 | ||
2744 | status = wait_lwp (lp); | |
2745 | if (status == 0) | |
2746 | return 0; | |
2747 | ||
57380f4e DJ |
2748 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2749 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2750 | { |
57380f4e | 2751 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2752 | |
2753 | errno = 0; | |
2754 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2755 | if (debug_linux_nat) | |
2756 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2757 | "PTRACE_CONT %s, 0, 0 (%s) " |
2758 | "(discarding SIGINT)\n", | |
d6b0e80f AC |
2759 | target_pid_to_str (lp->ptid), |
2760 | errno ? safe_strerror (errno) : "OK"); | |
2761 | ||
57380f4e | 2762 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2763 | } |
2764 | ||
57380f4e DJ |
2765 | maybe_clear_ignore_sigint (lp); |
2766 | ||
d6b0e80f AC |
2767 | if (WSTOPSIG (status) != SIGSTOP) |
2768 | { | |
26ab7092 | 2769 | if (linux_nat_status_is_event (status)) |
d6b0e80f AC |
2770 | { |
2771 | /* If a LWP other than the LWP that we're reporting an | |
2772 | event for has hit a GDB breakpoint (as opposed to | |
2773 | some random trap signal), then just arrange for it to | |
2774 | hit it again later. We don't keep the SIGTRAP status | |
2775 | and don't forward the SIGTRAP signal to the LWP. We | |
2776 | will handle the current event, eventually we will | |
2777 | resume all LWPs, and this one will get its breakpoint | |
2778 | trap again. | |
2779 | ||
2780 | If we do not do this, then we run the risk that the | |
2781 | user will delete or disable the breakpoint, but the | |
2782 | thread will have already tripped on it. */ | |
2783 | ||
9f0bdab8 DJ |
2784 | /* Save the trap's siginfo in case we need it later. */ |
2785 | save_siginfo (lp); | |
2786 | ||
ebec9a0f PA |
2787 | save_sigtrap (lp); |
2788 | ||
1777feb0 | 2789 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2790 | errno = 0; |
2791 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2792 | if (debug_linux_nat) | |
2793 | { | |
2794 | fprintf_unfiltered (gdb_stdlog, | |
2795 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2796 | target_pid_to_str (lp->ptid), | |
2797 | errno ? safe_strerror (errno) : "OK"); | |
2798 | ||
2799 | fprintf_unfiltered (gdb_stdlog, | |
2800 | "SWC: Candidate SIGTRAP event in %s\n", | |
2801 | target_pid_to_str (lp->ptid)); | |
2802 | } | |
710151dd | 2803 | /* Hold this event/waitstatus while we check to see if |
1777feb0 | 2804 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2805 | stop_wait_callback (lp, NULL); |
710151dd | 2806 | |
7feb7d06 PA |
2807 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2808 | there's another event, throw it back into the | |
1777feb0 | 2809 | queue. */ |
7feb7d06 | 2810 | if (lp->status) |
710151dd | 2811 | { |
7feb7d06 PA |
2812 | if (debug_linux_nat) |
2813 | fprintf_unfiltered (gdb_stdlog, | |
2814 | "SWC: kill %s, %s\n", | |
2815 | target_pid_to_str (lp->ptid), | |
2816 | status_to_str ((int) status)); | |
2817 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2818 | } |
7feb7d06 | 2819 | |
1777feb0 | 2820 | /* Save the sigtrap event. */ |
7feb7d06 | 2821 | lp->status = status; |
d6b0e80f AC |
2822 | return 0; |
2823 | } | |
2824 | else | |
2825 | { | |
2826 | /* The thread was stopped with a signal other than | |
1777feb0 | 2827 | SIGSTOP, and didn't accidentally trip a breakpoint. */ |
d6b0e80f AC |
2828 | |
2829 | if (debug_linux_nat) | |
2830 | { | |
2831 | fprintf_unfiltered (gdb_stdlog, | |
2832 | "SWC: Pending event %s in %s\n", | |
2833 | status_to_str ((int) status), | |
2834 | target_pid_to_str (lp->ptid)); | |
2835 | } | |
1777feb0 | 2836 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2837 | errno = 0; |
2838 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2839 | if (debug_linux_nat) | |
2840 | fprintf_unfiltered (gdb_stdlog, | |
2841 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2842 | target_pid_to_str (lp->ptid), | |
2843 | errno ? safe_strerror (errno) : "OK"); | |
2844 | ||
2845 | /* Hold this event/waitstatus while we check to see if | |
1777feb0 | 2846 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2847 | stop_wait_callback (lp, NULL); |
710151dd PA |
2848 | |
2849 | /* If the lp->status field is still empty, use it to | |
2850 | hold this event. If not, then this event must be | |
2851 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2852 | if (lp->status) |
d6b0e80f AC |
2853 | { |
2854 | if (debug_linux_nat) | |
2855 | { | |
2856 | fprintf_unfiltered (gdb_stdlog, | |
2857 | "SWC: kill %s, %s\n", | |
2858 | target_pid_to_str (lp->ptid), | |
2859 | status_to_str ((int) status)); | |
2860 | } | |
2861 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2862 | } | |
710151dd PA |
2863 | else |
2864 | lp->status = status; | |
d6b0e80f AC |
2865 | return 0; |
2866 | } | |
2867 | } | |
2868 | else | |
2869 | { | |
2870 | /* We caught the SIGSTOP that we intended to catch, so | |
2871 | there's no SIGSTOP pending. */ | |
2872 | lp->stopped = 1; | |
2873 | lp->signalled = 0; | |
2874 | } | |
2875 | } | |
2876 | ||
2877 | return 0; | |
2878 | } | |
2879 | ||
d6b0e80f AC |
2880 | /* Return non-zero if LP has a wait status pending. */ |
2881 | ||
2882 | static int | |
2883 | status_callback (struct lwp_info *lp, void *data) | |
2884 | { | |
2885 | /* Only report a pending wait status if we pretend that this has | |
2886 | indeed been resumed. */ | |
ca2163eb PA |
2887 | if (!lp->resumed) |
2888 | return 0; | |
2889 | ||
2890 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2891 | { | |
2892 | /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event, | |
766062f6 | 2893 | or a pending process exit. Note that `W_EXITCODE(0,0) == |
ca2163eb PA |
2894 | 0', so a clean process exit can not be stored pending in |
2895 | lp->status, it is indistinguishable from | |
2896 | no-pending-status. */ | |
2897 | return 1; | |
2898 | } | |
2899 | ||
2900 | if (lp->status != 0) | |
2901 | return 1; | |
2902 | ||
2903 | return 0; | |
d6b0e80f AC |
2904 | } |
2905 | ||
2906 | /* Return non-zero if LP isn't stopped. */ | |
2907 | ||
2908 | static int | |
2909 | running_callback (struct lwp_info *lp, void *data) | |
2910 | { | |
2911 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2912 | } | |
2913 | ||
2914 | /* Count the LWP's that have had events. */ | |
2915 | ||
2916 | static int | |
2917 | count_events_callback (struct lwp_info *lp, void *data) | |
2918 | { | |
2919 | int *count = data; | |
2920 | ||
2921 | gdb_assert (count != NULL); | |
2922 | ||
e09490f1 | 2923 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2924 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2925 | (*count)++; |
2926 | ||
2927 | return 0; | |
2928 | } | |
2929 | ||
2930 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2931 | ||
2932 | static int | |
2933 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2934 | { | |
2935 | if (lp->step && lp->status != 0) | |
2936 | return 1; | |
2937 | else | |
2938 | return 0; | |
2939 | } | |
2940 | ||
2941 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2942 | ||
2943 | static int | |
2944 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2945 | { | |
2946 | int *selector = data; | |
2947 | ||
2948 | gdb_assert (selector != NULL); | |
2949 | ||
1777feb0 | 2950 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2951 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2952 | if ((*selector)-- == 0) |
2953 | return 1; | |
2954 | ||
2955 | return 0; | |
2956 | } | |
2957 | ||
710151dd PA |
2958 | static int |
2959 | cancel_breakpoint (struct lwp_info *lp) | |
2960 | { | |
2961 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2962 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2963 | LWP. We will handle the current event, eventually we will resume | |
2964 | this LWP, and this breakpoint will trap again. | |
2965 | ||
2966 | If we do not do this, then we run the risk that the user will | |
2967 | delete or disable the breakpoint, but the LWP will have already | |
2968 | tripped on it. */ | |
2969 | ||
515630c5 UW |
2970 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2971 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2972 | CORE_ADDR pc; | |
2973 | ||
2974 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
6c95b8df | 2975 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
710151dd PA |
2976 | { |
2977 | if (debug_linux_nat) | |
2978 | fprintf_unfiltered (gdb_stdlog, | |
2979 | "CB: Push back breakpoint for %s\n", | |
2980 | target_pid_to_str (lp->ptid)); | |
2981 | ||
2982 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2983 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2984 | regcache_write_pc (regcache, pc); | |
2985 | ||
710151dd PA |
2986 | return 1; |
2987 | } | |
2988 | return 0; | |
2989 | } | |
2990 | ||
d6b0e80f AC |
2991 | static int |
2992 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2993 | { | |
2994 | struct lwp_info *event_lp = data; | |
2995 | ||
2996 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2997 | if (lp == event_lp) | |
2998 | return 0; | |
2999 | ||
3000 | /* If a LWP other than the LWP that we're reporting an event for has | |
3001 | hit a GDB breakpoint (as opposed to some random trap signal), | |
3002 | then just arrange for it to hit it again later. We don't keep | |
3003 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
3004 | LWP. We will handle the current event, eventually we will resume | |
3005 | all LWPs, and this one will get its breakpoint trap again. | |
3006 | ||
3007 | If we do not do this, then we run the risk that the user will | |
3008 | delete or disable the breakpoint, but the LWP will have already | |
3009 | tripped on it. */ | |
3010 | ||
00390b84 | 3011 | if (linux_nat_lp_status_is_event (lp) |
710151dd PA |
3012 | && cancel_breakpoint (lp)) |
3013 | /* Throw away the SIGTRAP. */ | |
3014 | lp->status = 0; | |
d6b0e80f AC |
3015 | |
3016 | return 0; | |
3017 | } | |
3018 | ||
3019 | /* Select one LWP out of those that have events pending. */ | |
3020 | ||
3021 | static void | |
d90e17a7 | 3022 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
3023 | { |
3024 | int num_events = 0; | |
3025 | int random_selector; | |
3026 | struct lwp_info *event_lp; | |
3027 | ||
ac264b3b | 3028 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
3029 | (*orig_lp)->status = *status; |
3030 | ||
3031 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
3032 | event_lp = iterate_over_lwps (filter, |
3033 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
3034 | if (event_lp != NULL) |
3035 | { | |
3036 | if (debug_linux_nat) | |
3037 | fprintf_unfiltered (gdb_stdlog, | |
3038 | "SEL: Select single-step %s\n", | |
3039 | target_pid_to_str (event_lp->ptid)); | |
3040 | } | |
3041 | else | |
3042 | { | |
3043 | /* No single-stepping LWP. Select one at random, out of those | |
3044 | which have had SIGTRAP events. */ | |
3045 | ||
3046 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 3047 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
3048 | |
3049 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
3050 | random_selector = (int) | |
3051 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3052 | ||
3053 | if (debug_linux_nat && num_events > 1) | |
3054 | fprintf_unfiltered (gdb_stdlog, | |
3055 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
3056 | num_events, random_selector); | |
3057 | ||
d90e17a7 PA |
3058 | event_lp = iterate_over_lwps (filter, |
3059 | select_event_lwp_callback, | |
d6b0e80f AC |
3060 | &random_selector); |
3061 | } | |
3062 | ||
3063 | if (event_lp != NULL) | |
3064 | { | |
3065 | /* Switch the event LWP. */ | |
3066 | *orig_lp = event_lp; | |
3067 | *status = event_lp->status; | |
3068 | } | |
3069 | ||
3070 | /* Flush the wait status for the event LWP. */ | |
3071 | (*orig_lp)->status = 0; | |
3072 | } | |
3073 | ||
3074 | /* Return non-zero if LP has been resumed. */ | |
3075 | ||
3076 | static int | |
3077 | resumed_callback (struct lwp_info *lp, void *data) | |
3078 | { | |
3079 | return lp->resumed; | |
3080 | } | |
3081 | ||
d6b0e80f AC |
3082 | /* Stop an active thread, verify it still exists, then resume it. */ |
3083 | ||
3084 | static int | |
3085 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
3086 | { | |
3087 | struct lwp_info *ptr; | |
3088 | ||
3089 | if (!lp->stopped && !lp->signalled) | |
3090 | { | |
3091 | stop_callback (lp, NULL); | |
3092 | stop_wait_callback (lp, NULL); | |
3093 | /* Resume if the lwp still exists. */ | |
3094 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
3095 | if (lp == ptr) | |
3096 | { | |
3097 | resume_callback (lp, NULL); | |
3098 | resume_set_callback (lp, NULL); | |
3099 | } | |
3100 | } | |
3101 | return 0; | |
3102 | } | |
3103 | ||
02f3fc28 | 3104 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 3105 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
3106 | static struct lwp_info * |
3107 | linux_nat_filter_event (int lwpid, int status, int options) | |
3108 | { | |
3109 | struct lwp_info *lp; | |
3110 | ||
3111 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
3112 | ||
3113 | /* Check for stop events reported by a process we didn't already | |
3114 | know about - anything not already in our LWP list. | |
3115 | ||
3116 | If we're expecting to receive stopped processes after | |
3117 | fork, vfork, and clone events, then we'll just add the | |
3118 | new one to our list and go back to waiting for the event | |
3119 | to be reported - the stopped process might be returned | |
3120 | from waitpid before or after the event is. */ | |
3121 | if (WIFSTOPPED (status) && !lp) | |
3122 | { | |
3123 | linux_record_stopped_pid (lwpid, status); | |
3124 | return NULL; | |
3125 | } | |
3126 | ||
3127 | /* Make sure we don't report an event for the exit of an LWP not in | |
1777feb0 | 3128 | our list, i.e. not part of the current process. This can happen |
fd62cb89 | 3129 | if we detach from a program we originally forked and then it |
02f3fc28 PA |
3130 | exits. */ |
3131 | if (!WIFSTOPPED (status) && !lp) | |
3132 | return NULL; | |
3133 | ||
3134 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
3135 | CLONE_PTRACE processes which do not use the thread library - | |
3136 | otherwise we wouldn't find the new LWP this way. That doesn't | |
3137 | currently work, and the following code is currently unreachable | |
3138 | due to the two blocks above. If it's fixed some day, this code | |
3139 | should be broken out into a function so that we can also pick up | |
3140 | LWPs from the new interface. */ | |
3141 | if (!lp) | |
3142 | { | |
3143 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
3144 | if (options & __WCLONE) | |
3145 | lp->cloned = 1; | |
3146 | ||
3147 | gdb_assert (WIFSTOPPED (status) | |
3148 | && WSTOPSIG (status) == SIGSTOP); | |
3149 | lp->signalled = 1; | |
3150 | ||
3151 | if (!in_thread_list (inferior_ptid)) | |
3152 | { | |
3153 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
3154 | GET_PID (inferior_ptid)); | |
3155 | add_thread (inferior_ptid); | |
3156 | } | |
3157 | ||
3158 | add_thread (lp->ptid); | |
3159 | } | |
3160 | ||
ca2163eb PA |
3161 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3162 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3163 | { | |
3164 | /* No longer need the sysgood bit. The ptrace event ends up | |
3165 | recorded in lp->waitstatus if we care for it. We can carry | |
3166 | on handling the event like a regular SIGTRAP from here | |
3167 | on. */ | |
3168 | status = W_STOPCODE (SIGTRAP); | |
3169 | if (linux_handle_syscall_trap (lp, 0)) | |
3170 | return NULL; | |
3171 | } | |
02f3fc28 | 3172 | |
ca2163eb PA |
3173 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
3174 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
02f3fc28 PA |
3175 | { |
3176 | if (debug_linux_nat) | |
3177 | fprintf_unfiltered (gdb_stdlog, | |
3178 | "LLW: Handling extended status 0x%06x\n", | |
3179 | status); | |
3180 | if (linux_handle_extended_wait (lp, status, 0)) | |
3181 | return NULL; | |
3182 | } | |
3183 | ||
26ab7092 | 3184 | if (linux_nat_status_is_event (status)) |
ebec9a0f PA |
3185 | { |
3186 | /* Save the trap's siginfo in case we need it later. */ | |
3187 | save_siginfo (lp); | |
3188 | ||
3189 | save_sigtrap (lp); | |
3190 | } | |
ca2163eb | 3191 | |
02f3fc28 | 3192 | /* Check if the thread has exited. */ |
d90e17a7 PA |
3193 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
3194 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 3195 | { |
9db03742 JB |
3196 | /* If this is the main thread, we must stop all threads and verify |
3197 | if they are still alive. This is because in the nptl thread model | |
3198 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
3199 | other than the main thread. We only get the main thread exit |
3200 | signal once all child threads have already exited. If we | |
3201 | stop all the threads and use the stop_wait_callback to check | |
3202 | if they have exited we can determine whether this signal | |
3203 | should be ignored or whether it means the end of the debugged | |
3204 | application, regardless of which threading model is being | |
5d3b6af6 | 3205 | used. */ |
02f3fc28 PA |
3206 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
3207 | { | |
3208 | lp->stopped = 1; | |
d90e17a7 PA |
3209 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
3210 | stop_and_resume_callback, NULL); | |
02f3fc28 PA |
3211 | } |
3212 | ||
3213 | if (debug_linux_nat) | |
3214 | fprintf_unfiltered (gdb_stdlog, | |
3215 | "LLW: %s exited.\n", | |
3216 | target_pid_to_str (lp->ptid)); | |
3217 | ||
d90e17a7 | 3218 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
3219 | { |
3220 | /* If there is at least one more LWP, then the exit signal | |
3221 | was not the end of the debugged application and should be | |
3222 | ignored. */ | |
3223 | exit_lwp (lp); | |
3224 | return NULL; | |
3225 | } | |
02f3fc28 PA |
3226 | } |
3227 | ||
3228 | /* Check if the current LWP has previously exited. In the nptl | |
3229 | thread model, LWPs other than the main thread do not issue | |
3230 | signals when they exit so we must check whenever the thread has | |
3231 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 3232 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 3233 | { |
d90e17a7 PA |
3234 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
3235 | ||
02f3fc28 PA |
3236 | if (debug_linux_nat) |
3237 | fprintf_unfiltered (gdb_stdlog, | |
3238 | "LLW: %s exited.\n", | |
3239 | target_pid_to_str (lp->ptid)); | |
3240 | ||
3241 | exit_lwp (lp); | |
3242 | ||
3243 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 3244 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
3245 | |
3246 | /* Discard the event. */ | |
3247 | return NULL; | |
3248 | } | |
3249 | ||
3250 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
3251 | an attempt to stop an LWP. */ | |
3252 | if (lp->signalled | |
3253 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3254 | { | |
3255 | if (debug_linux_nat) | |
3256 | fprintf_unfiltered (gdb_stdlog, | |
3257 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
3258 | target_pid_to_str (lp->ptid)); | |
3259 | ||
3260 | /* This is a delayed SIGSTOP. */ | |
3261 | lp->signalled = 0; | |
3262 | ||
3263 | registers_changed (); | |
3264 | ||
28439f5e | 3265 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
02f3fc28 PA |
3266 | lp->step, TARGET_SIGNAL_0); |
3267 | if (debug_linux_nat) | |
3268 | fprintf_unfiltered (gdb_stdlog, | |
3269 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
3270 | lp->step ? | |
3271 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3272 | target_pid_to_str (lp->ptid)); | |
3273 | ||
3274 | lp->stopped = 0; | |
3275 | gdb_assert (lp->resumed); | |
3276 | ||
3277 | /* Discard the event. */ | |
3278 | return NULL; | |
3279 | } | |
3280 | ||
57380f4e DJ |
3281 | /* Make sure we don't report a SIGINT that we have already displayed |
3282 | for another thread. */ | |
3283 | if (lp->ignore_sigint | |
3284 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3285 | { | |
3286 | if (debug_linux_nat) | |
3287 | fprintf_unfiltered (gdb_stdlog, | |
3288 | "LLW: Delayed SIGINT caught for %s.\n", | |
3289 | target_pid_to_str (lp->ptid)); | |
3290 | ||
3291 | /* This is a delayed SIGINT. */ | |
3292 | lp->ignore_sigint = 0; | |
3293 | ||
3294 | registers_changed (); | |
28439f5e | 3295 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
3296 | lp->step, TARGET_SIGNAL_0); |
3297 | if (debug_linux_nat) | |
3298 | fprintf_unfiltered (gdb_stdlog, | |
3299 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3300 | lp->step ? | |
3301 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3302 | target_pid_to_str (lp->ptid)); | |
3303 | ||
3304 | lp->stopped = 0; | |
3305 | gdb_assert (lp->resumed); | |
3306 | ||
3307 | /* Discard the event. */ | |
3308 | return NULL; | |
3309 | } | |
3310 | ||
02f3fc28 PA |
3311 | /* An interesting event. */ |
3312 | gdb_assert (lp); | |
ca2163eb | 3313 | lp->status = status; |
02f3fc28 PA |
3314 | return lp; |
3315 | } | |
3316 | ||
d6b0e80f | 3317 | static ptid_t |
7feb7d06 | 3318 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3319 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3320 | int target_options) | |
d6b0e80f | 3321 | { |
7feb7d06 | 3322 | static sigset_t prev_mask; |
d6b0e80f AC |
3323 | struct lwp_info *lp = NULL; |
3324 | int options = 0; | |
3325 | int status = 0; | |
d90e17a7 | 3326 | pid_t pid; |
d6b0e80f | 3327 | |
01124a23 | 3328 | if (debug_linux_nat) |
b84876c2 PA |
3329 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); |
3330 | ||
f973ed9c DJ |
3331 | /* The first time we get here after starting a new inferior, we may |
3332 | not have added it to the LWP list yet - this is the earliest | |
3333 | moment at which we know its PID. */ | |
d90e17a7 | 3334 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3335 | { |
27c9d204 PA |
3336 | /* Upgrade the main thread's ptid. */ |
3337 | thread_change_ptid (inferior_ptid, | |
3338 | BUILD_LWP (GET_PID (inferior_ptid), | |
3339 | GET_PID (inferior_ptid))); | |
3340 | ||
f973ed9c DJ |
3341 | lp = add_lwp (inferior_ptid); |
3342 | lp->resumed = 1; | |
3343 | } | |
3344 | ||
7feb7d06 PA |
3345 | /* Make sure SIGCHLD is blocked. */ |
3346 | block_child_signals (&prev_mask); | |
d6b0e80f | 3347 | |
d90e17a7 PA |
3348 | if (ptid_equal (ptid, minus_one_ptid)) |
3349 | pid = -1; | |
3350 | else if (ptid_is_pid (ptid)) | |
3351 | /* A request to wait for a specific tgid. This is not possible | |
3352 | with waitpid, so instead, we wait for any child, and leave | |
3353 | children we're not interested in right now with a pending | |
3354 | status to report later. */ | |
3355 | pid = -1; | |
3356 | else | |
3357 | pid = GET_LWP (ptid); | |
3358 | ||
d6b0e80f | 3359 | retry: |
d90e17a7 PA |
3360 | lp = NULL; |
3361 | status = 0; | |
d6b0e80f | 3362 | |
e3e9f5a2 PA |
3363 | /* Make sure that of those LWPs we want to get an event from, there |
3364 | is at least one LWP that has been resumed. If there's none, just | |
3365 | bail out. The core may just be flushing asynchronously all | |
3366 | events. */ | |
3367 | if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL) | |
3368 | { | |
3369 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3370 | ||
01124a23 | 3371 | if (debug_linux_nat) |
e3e9f5a2 PA |
3372 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n"); |
3373 | ||
3374 | restore_child_signals_mask (&prev_mask); | |
3375 | return minus_one_ptid; | |
3376 | } | |
d6b0e80f AC |
3377 | |
3378 | /* First check if there is a LWP with a wait status pending. */ | |
3379 | if (pid == -1) | |
3380 | { | |
3381 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 3382 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
3383 | if (lp) |
3384 | { | |
ca2163eb | 3385 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3386 | fprintf_unfiltered (gdb_stdlog, |
3387 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3388 | status_to_str (lp->status), |
d6b0e80f AC |
3389 | target_pid_to_str (lp->ptid)); |
3390 | } | |
3391 | ||
b84876c2 | 3392 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
3393 | cloned and uncloned processes. We start with the cloned |
3394 | processes. */ | |
d6b0e80f AC |
3395 | options = __WCLONE | WNOHANG; |
3396 | } | |
3397 | else if (is_lwp (ptid)) | |
3398 | { | |
3399 | if (debug_linux_nat) | |
3400 | fprintf_unfiltered (gdb_stdlog, | |
3401 | "LLW: Waiting for specific LWP %s.\n", | |
3402 | target_pid_to_str (ptid)); | |
3403 | ||
3404 | /* We have a specific LWP to check. */ | |
3405 | lp = find_lwp_pid (ptid); | |
3406 | gdb_assert (lp); | |
d6b0e80f | 3407 | |
ca2163eb | 3408 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3409 | fprintf_unfiltered (gdb_stdlog, |
3410 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3411 | status_to_str (lp->status), |
d6b0e80f AC |
3412 | target_pid_to_str (lp->ptid)); |
3413 | ||
3414 | /* If we have to wait, take into account whether PID is a cloned | |
3415 | process or not. And we have to convert it to something that | |
3416 | the layer beneath us can understand. */ | |
3417 | options = lp->cloned ? __WCLONE : 0; | |
3418 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
3419 | |
3420 | /* We check for lp->waitstatus in addition to lp->status, | |
3421 | because we can have pending process exits recorded in | |
3422 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
3423 | an additional lp->status_p flag. */ | |
ca2163eb | 3424 | if (lp->status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) |
d90e17a7 | 3425 | lp = NULL; |
d6b0e80f AC |
3426 | } |
3427 | ||
d90e17a7 | 3428 | if (lp && lp->signalled) |
d6b0e80f AC |
3429 | { |
3430 | /* A pending SIGSTOP may interfere with the normal stream of | |
3431 | events. In a typical case where interference is a problem, | |
3432 | we have a SIGSTOP signal pending for LWP A while | |
3433 | single-stepping it, encounter an event in LWP B, and take the | |
3434 | pending SIGSTOP while trying to stop LWP A. After processing | |
3435 | the event in LWP B, LWP A is continued, and we'll never see | |
3436 | the SIGTRAP associated with the last time we were | |
3437 | single-stepping LWP A. */ | |
3438 | ||
3439 | /* Resume the thread. It should halt immediately returning the | |
3440 | pending SIGSTOP. */ | |
3441 | registers_changed (); | |
28439f5e | 3442 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3443 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
3444 | if (debug_linux_nat) |
3445 | fprintf_unfiltered (gdb_stdlog, | |
3446 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
3447 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3448 | target_pid_to_str (lp->ptid)); | |
3449 | lp->stopped = 0; | |
3450 | gdb_assert (lp->resumed); | |
3451 | ||
ca2163eb PA |
3452 | /* Catch the pending SIGSTOP. */ |
3453 | status = lp->status; | |
3454 | lp->status = 0; | |
3455 | ||
d6b0e80f | 3456 | stop_wait_callback (lp, NULL); |
ca2163eb PA |
3457 | |
3458 | /* If the lp->status field isn't empty, we caught another signal | |
3459 | while flushing the SIGSTOP. Return it back to the event | |
3460 | queue of the LWP, as we already have an event to handle. */ | |
3461 | if (lp->status) | |
3462 | { | |
3463 | if (debug_linux_nat) | |
3464 | fprintf_unfiltered (gdb_stdlog, | |
3465 | "LLW: kill %s, %s\n", | |
3466 | target_pid_to_str (lp->ptid), | |
3467 | status_to_str (lp->status)); | |
3468 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
3469 | } | |
3470 | ||
3471 | lp->status = status; | |
d6b0e80f AC |
3472 | } |
3473 | ||
b84876c2 PA |
3474 | if (!target_can_async_p ()) |
3475 | { | |
3476 | /* Causes SIGINT to be passed on to the attached process. */ | |
3477 | set_sigint_trap (); | |
b84876c2 | 3478 | } |
d6b0e80f | 3479 | |
47608cb1 PA |
3480 | /* Translate generic target_wait options into waitpid options. */ |
3481 | if (target_options & TARGET_WNOHANG) | |
3482 | options |= WNOHANG; | |
7feb7d06 | 3483 | |
d90e17a7 | 3484 | while (lp == NULL) |
d6b0e80f AC |
3485 | { |
3486 | pid_t lwpid; | |
3487 | ||
7feb7d06 | 3488 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 3489 | |
d6b0e80f AC |
3490 | if (lwpid > 0) |
3491 | { | |
3492 | gdb_assert (pid == -1 || lwpid == pid); | |
3493 | ||
3494 | if (debug_linux_nat) | |
3495 | { | |
3496 | fprintf_unfiltered (gdb_stdlog, | |
3497 | "LLW: waitpid %ld received %s\n", | |
3498 | (long) lwpid, status_to_str (status)); | |
3499 | } | |
3500 | ||
02f3fc28 | 3501 | lp = linux_nat_filter_event (lwpid, status, options); |
d90e17a7 | 3502 | |
33355866 JK |
3503 | /* STATUS is now no longer valid, use LP->STATUS instead. */ |
3504 | status = 0; | |
3505 | ||
d90e17a7 PA |
3506 | if (lp |
3507 | && ptid_is_pid (ptid) | |
3508 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 3509 | { |
e3e9f5a2 PA |
3510 | gdb_assert (lp->resumed); |
3511 | ||
d90e17a7 | 3512 | if (debug_linux_nat) |
3e43a32a MS |
3513 | fprintf (stderr, |
3514 | "LWP %ld got an event %06x, leaving pending.\n", | |
33355866 | 3515 | ptid_get_lwp (lp->ptid), lp->status); |
d90e17a7 | 3516 | |
ca2163eb | 3517 | if (WIFSTOPPED (lp->status)) |
d90e17a7 | 3518 | { |
ca2163eb | 3519 | if (WSTOPSIG (lp->status) != SIGSTOP) |
d90e17a7 | 3520 | { |
e3e9f5a2 PA |
3521 | /* Cancel breakpoint hits. The breakpoint may |
3522 | be removed before we fetch events from this | |
3523 | process to report to the core. It is best | |
3524 | not to assume the moribund breakpoints | |
3525 | heuristic always handles these cases --- it | |
3526 | could be too many events go through to the | |
3527 | core before this one is handled. All-stop | |
3528 | always cancels breakpoint hits in all | |
3529 | threads. */ | |
3530 | if (non_stop | |
00390b84 | 3531 | && linux_nat_lp_status_is_event (lp) |
e3e9f5a2 PA |
3532 | && cancel_breakpoint (lp)) |
3533 | { | |
3534 | /* Throw away the SIGTRAP. */ | |
3535 | lp->status = 0; | |
3536 | ||
3537 | if (debug_linux_nat) | |
3538 | fprintf (stderr, | |
3e43a32a MS |
3539 | "LLW: LWP %ld hit a breakpoint while" |
3540 | " waiting for another process;" | |
3541 | " cancelled it\n", | |
e3e9f5a2 PA |
3542 | ptid_get_lwp (lp->ptid)); |
3543 | } | |
3544 | lp->stopped = 1; | |
d90e17a7 PA |
3545 | } |
3546 | else | |
3547 | { | |
3548 | lp->stopped = 1; | |
3549 | lp->signalled = 0; | |
3550 | } | |
3551 | } | |
33355866 | 3552 | else if (WIFEXITED (lp->status) || WIFSIGNALED (lp->status)) |
d90e17a7 PA |
3553 | { |
3554 | if (debug_linux_nat) | |
3e43a32a MS |
3555 | fprintf (stderr, |
3556 | "Process %ld exited while stopping LWPs\n", | |
d90e17a7 PA |
3557 | ptid_get_lwp (lp->ptid)); |
3558 | ||
3559 | /* This was the last lwp in the process. Since | |
3560 | events are serialized to GDB core, and we can't | |
3561 | report this one right now, but GDB core and the | |
3562 | other target layers will want to be notified | |
3563 | about the exit code/signal, leave the status | |
3564 | pending for the next time we're able to report | |
3565 | it. */ | |
d90e17a7 PA |
3566 | |
3567 | /* Prevent trying to stop this thread again. We'll | |
3568 | never try to resume it because it has a pending | |
3569 | status. */ | |
3570 | lp->stopped = 1; | |
3571 | ||
3572 | /* Dead LWP's aren't expected to reported a pending | |
3573 | sigstop. */ | |
3574 | lp->signalled = 0; | |
3575 | ||
3576 | /* Store the pending event in the waitstatus as | |
3577 | well, because W_EXITCODE(0,0) == 0. */ | |
ca2163eb | 3578 | store_waitstatus (&lp->waitstatus, lp->status); |
d90e17a7 PA |
3579 | } |
3580 | ||
3581 | /* Keep looking. */ | |
3582 | lp = NULL; | |
d6b0e80f AC |
3583 | continue; |
3584 | } | |
3585 | ||
d90e17a7 PA |
3586 | if (lp) |
3587 | break; | |
3588 | else | |
3589 | { | |
3590 | if (pid == -1) | |
3591 | { | |
3592 | /* waitpid did return something. Restart over. */ | |
3593 | options |= __WCLONE; | |
3594 | } | |
3595 | continue; | |
3596 | } | |
d6b0e80f AC |
3597 | } |
3598 | ||
3599 | if (pid == -1) | |
3600 | { | |
3601 | /* Alternate between checking cloned and uncloned processes. */ | |
3602 | options ^= __WCLONE; | |
3603 | ||
b84876c2 PA |
3604 | /* And every time we have checked both: |
3605 | In async mode, return to event loop; | |
3606 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 3607 | if (options & __WCLONE) |
b84876c2 | 3608 | { |
47608cb1 | 3609 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
3610 | { |
3611 | /* No interesting event. */ | |
3612 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3613 | ||
01124a23 | 3614 | if (debug_linux_nat) |
b84876c2 PA |
3615 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3616 | ||
7feb7d06 | 3617 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
3618 | return minus_one_ptid; |
3619 | } | |
3620 | ||
3621 | sigsuspend (&suspend_mask); | |
3622 | } | |
d6b0e80f | 3623 | } |
28736962 PA |
3624 | else if (target_options & TARGET_WNOHANG) |
3625 | { | |
3626 | /* No interesting event for PID yet. */ | |
3627 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3628 | ||
01124a23 | 3629 | if (debug_linux_nat) |
28736962 PA |
3630 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3631 | ||
3632 | restore_child_signals_mask (&prev_mask); | |
3633 | return minus_one_ptid; | |
3634 | } | |
d6b0e80f AC |
3635 | |
3636 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3637 | gdb_assert (lp == NULL); |
d6b0e80f AC |
3638 | } |
3639 | ||
b84876c2 | 3640 | if (!target_can_async_p ()) |
d26b5354 | 3641 | clear_sigint_trap (); |
d6b0e80f AC |
3642 | |
3643 | gdb_assert (lp); | |
3644 | ||
ca2163eb PA |
3645 | status = lp->status; |
3646 | lp->status = 0; | |
3647 | ||
d6b0e80f AC |
3648 | /* Don't report signals that GDB isn't interested in, such as |
3649 | signals that are neither printed nor stopped upon. Stopping all | |
3650 | threads can be a bit time-consuming so if we want decent | |
3651 | performance with heavily multi-threaded programs, especially when | |
3652 | they're using a high frequency timer, we'd better avoid it if we | |
3653 | can. */ | |
3654 | ||
3655 | if (WIFSTOPPED (status)) | |
3656 | { | |
423ec54c | 3657 | enum target_signal signo = target_signal_from_host (WSTOPSIG (status)); |
d6b0e80f | 3658 | |
2455069d UW |
3659 | /* When using hardware single-step, we need to report every signal. |
3660 | Otherwise, signals in pass_mask may be short-circuited. */ | |
d539ed7e | 3661 | if (!lp->step |
2455069d | 3662 | && WSTOPSIG (status) && sigismember (&pass_mask, WSTOPSIG (status))) |
d6b0e80f AC |
3663 | { |
3664 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3665 | here? It is not clear we should. GDB may not expect | |
3666 | other threads to run. On the other hand, not resuming | |
3667 | newly attached threads may cause an unwanted delay in | |
3668 | getting them running. */ | |
3669 | registers_changed (); | |
28439f5e | 3670 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3671 | lp->step, signo); |
d6b0e80f AC |
3672 | if (debug_linux_nat) |
3673 | fprintf_unfiltered (gdb_stdlog, | |
3674 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3675 | lp->step ? | |
3676 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3677 | target_pid_to_str (lp->ptid), | |
423ec54c JK |
3678 | (signo != TARGET_SIGNAL_0 |
3679 | ? strsignal (target_signal_to_host (signo)) | |
3680 | : "0")); | |
d6b0e80f | 3681 | lp->stopped = 0; |
d6b0e80f AC |
3682 | goto retry; |
3683 | } | |
3684 | ||
1ad15515 | 3685 | if (!non_stop) |
d6b0e80f | 3686 | { |
1ad15515 PA |
3687 | /* Only do the below in all-stop, as we currently use SIGINT |
3688 | to implement target_stop (see linux_nat_stop) in | |
3689 | non-stop. */ | |
3690 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3691 | { | |
3692 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3693 | forwarded to the entire process group, that is, all LWPs | |
3694 | will receive it - unless they're using CLONE_THREAD to | |
3695 | share signals. Since we only want to report it once, we | |
3696 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3697 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3698 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3699 | lp->ignore_sigint = 0; |
3700 | } | |
3701 | else | |
3702 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3703 | } |
3704 | } | |
3705 | ||
3706 | /* This LWP is stopped now. */ | |
3707 | lp->stopped = 1; | |
3708 | ||
3709 | if (debug_linux_nat) | |
3710 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3711 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3712 | ||
4c28f408 PA |
3713 | if (!non_stop) |
3714 | { | |
3715 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3716 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3717 | |
3718 | /* ... and wait until all of them have reported back that | |
3719 | they're no longer running. */ | |
d90e17a7 | 3720 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3721 | |
3722 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3723 | from among those that have had events. Giving equal priority | |
3724 | to all LWPs that have had events helps prevent | |
3725 | starvation. */ | |
3726 | if (pid == -1) | |
d90e17a7 | 3727 | select_event_lwp (ptid, &lp, &status); |
d6b0e80f | 3728 | |
e3e9f5a2 PA |
3729 | /* Now that we've selected our final event LWP, cancel any |
3730 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
3731 | See the comment in cancel_breakpoints_callback to find out | |
3732 | why. */ | |
3733 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); | |
3734 | ||
3735 | /* In all-stop, from the core's perspective, all LWPs are now | |
3736 | stopped until a new resume action is sent over. */ | |
3737 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
3738 | } | |
3739 | else | |
3740 | lp->resumed = 0; | |
d6b0e80f | 3741 | |
26ab7092 | 3742 | if (linux_nat_status_is_event (status)) |
d6b0e80f | 3743 | { |
d6b0e80f AC |
3744 | if (debug_linux_nat) |
3745 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3746 | "LLW: trap ptid is %s.\n", |
3747 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3748 | } |
d6b0e80f AC |
3749 | |
3750 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3751 | { | |
3752 | *ourstatus = lp->waitstatus; | |
3753 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3754 | } | |
3755 | else | |
3756 | store_waitstatus (ourstatus, status); | |
3757 | ||
01124a23 | 3758 | if (debug_linux_nat) |
b84876c2 PA |
3759 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); |
3760 | ||
7feb7d06 | 3761 | restore_child_signals_mask (&prev_mask); |
1e225492 JK |
3762 | |
3763 | if (ourstatus->kind == TARGET_WAITKIND_EXITED | |
3764 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
3765 | lp->core = -1; | |
3766 | else | |
3767 | lp->core = linux_nat_core_of_thread_1 (lp->ptid); | |
3768 | ||
f973ed9c | 3769 | return lp->ptid; |
d6b0e80f AC |
3770 | } |
3771 | ||
e3e9f5a2 PA |
3772 | /* Resume LWPs that are currently stopped without any pending status |
3773 | to report, but are resumed from the core's perspective. */ | |
3774 | ||
3775 | static int | |
3776 | resume_stopped_resumed_lwps (struct lwp_info *lp, void *data) | |
3777 | { | |
3778 | ptid_t *wait_ptid_p = data; | |
3779 | ||
3780 | if (lp->stopped | |
3781 | && lp->resumed | |
3782 | && lp->status == 0 | |
3783 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
3784 | { | |
3785 | gdb_assert (is_executing (lp->ptid)); | |
3786 | ||
3787 | /* Don't bother if there's a breakpoint at PC that we'd hit | |
3788 | immediately, and we're not waiting for this LWP. */ | |
3789 | if (!ptid_match (lp->ptid, *wait_ptid_p)) | |
3790 | { | |
3791 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
3792 | CORE_ADDR pc = regcache_read_pc (regcache); | |
3793 | ||
3794 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3795 | return 0; | |
3796 | } | |
3797 | ||
3798 | if (debug_linux_nat) | |
3799 | fprintf_unfiltered (gdb_stdlog, | |
3800 | "RSRL: resuming stopped-resumed LWP %s\n", | |
3801 | target_pid_to_str (lp->ptid)); | |
3802 | ||
3803 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
3804 | lp->step, TARGET_SIGNAL_0); | |
3805 | lp->stopped = 0; | |
3806 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
3807 | lp->stopped_by_watchpoint = 0; | |
3808 | } | |
3809 | ||
3810 | return 0; | |
3811 | } | |
3812 | ||
7feb7d06 PA |
3813 | static ptid_t |
3814 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3815 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3816 | int target_options) | |
7feb7d06 PA |
3817 | { |
3818 | ptid_t event_ptid; | |
3819 | ||
3820 | if (debug_linux_nat) | |
3e43a32a MS |
3821 | fprintf_unfiltered (gdb_stdlog, |
3822 | "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
7feb7d06 PA |
3823 | |
3824 | /* Flush the async file first. */ | |
3825 | if (target_can_async_p ()) | |
3826 | async_file_flush (); | |
3827 | ||
e3e9f5a2 PA |
3828 | /* Resume LWPs that are currently stopped without any pending status |
3829 | to report, but are resumed from the core's perspective. LWPs get | |
3830 | in this state if we find them stopping at a time we're not | |
3831 | interested in reporting the event (target_wait on a | |
3832 | specific_process, for example, see linux_nat_wait_1), and | |
3833 | meanwhile the event became uninteresting. Don't bother resuming | |
3834 | LWPs we're not going to wait for if they'd stop immediately. */ | |
3835 | if (non_stop) | |
3836 | iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid); | |
3837 | ||
47608cb1 | 3838 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3839 | |
3840 | /* If we requested any event, and something came out, assume there | |
3841 | may be more. If we requested a specific lwp or process, also | |
3842 | assume there may be more. */ | |
3843 | if (target_can_async_p () | |
3844 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3845 | || !ptid_equal (ptid, minus_one_ptid))) | |
3846 | async_file_mark (); | |
3847 | ||
3848 | /* Get ready for the next event. */ | |
3849 | if (target_can_async_p ()) | |
3850 | target_async (inferior_event_handler, 0); | |
3851 | ||
3852 | return event_ptid; | |
3853 | } | |
3854 | ||
d6b0e80f AC |
3855 | static int |
3856 | kill_callback (struct lwp_info *lp, void *data) | |
3857 | { | |
ed731959 JK |
3858 | /* PTRACE_KILL may resume the inferior. Send SIGKILL first. */ |
3859 | ||
3860 | errno = 0; | |
3861 | kill (GET_LWP (lp->ptid), SIGKILL); | |
3862 | if (debug_linux_nat) | |
3863 | fprintf_unfiltered (gdb_stdlog, | |
3864 | "KC: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
3865 | target_pid_to_str (lp->ptid), | |
3866 | errno ? safe_strerror (errno) : "OK"); | |
3867 | ||
3868 | /* Some kernels ignore even SIGKILL for processes under ptrace. */ | |
3869 | ||
d6b0e80f AC |
3870 | errno = 0; |
3871 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3872 | if (debug_linux_nat) | |
3873 | fprintf_unfiltered (gdb_stdlog, | |
3874 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3875 | target_pid_to_str (lp->ptid), | |
3876 | errno ? safe_strerror (errno) : "OK"); | |
3877 | ||
3878 | return 0; | |
3879 | } | |
3880 | ||
3881 | static int | |
3882 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3883 | { | |
3884 | pid_t pid; | |
3885 | ||
3886 | /* We must make sure that there are no pending events (delayed | |
3887 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3888 | program doesn't interfere with any following debugging session. */ | |
3889 | ||
3890 | /* For cloned processes we must check both with __WCLONE and | |
3891 | without, since the exit status of a cloned process isn't reported | |
3892 | with __WCLONE. */ | |
3893 | if (lp->cloned) | |
3894 | { | |
3895 | do | |
3896 | { | |
58aecb61 | 3897 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3898 | if (pid != (pid_t) -1) |
d6b0e80f | 3899 | { |
e85a822c DJ |
3900 | if (debug_linux_nat) |
3901 | fprintf_unfiltered (gdb_stdlog, | |
3902 | "KWC: wait %s received unknown.\n", | |
3903 | target_pid_to_str (lp->ptid)); | |
3904 | /* The Linux kernel sometimes fails to kill a thread | |
3905 | completely after PTRACE_KILL; that goes from the stop | |
3906 | point in do_fork out to the one in | |
3907 | get_signal_to_deliever and waits again. So kill it | |
3908 | again. */ | |
3909 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3910 | } |
3911 | } | |
3912 | while (pid == GET_LWP (lp->ptid)); | |
3913 | ||
3914 | gdb_assert (pid == -1 && errno == ECHILD); | |
3915 | } | |
3916 | ||
3917 | do | |
3918 | { | |
58aecb61 | 3919 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3920 | if (pid != (pid_t) -1) |
d6b0e80f | 3921 | { |
e85a822c DJ |
3922 | if (debug_linux_nat) |
3923 | fprintf_unfiltered (gdb_stdlog, | |
3924 | "KWC: wait %s received unk.\n", | |
3925 | target_pid_to_str (lp->ptid)); | |
3926 | /* See the call to kill_callback above. */ | |
3927 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3928 | } |
3929 | } | |
3930 | while (pid == GET_LWP (lp->ptid)); | |
3931 | ||
3932 | gdb_assert (pid == -1 && errno == ECHILD); | |
3933 | return 0; | |
3934 | } | |
3935 | ||
3936 | static void | |
7d85a9c0 | 3937 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3938 | { |
f973ed9c DJ |
3939 | struct target_waitstatus last; |
3940 | ptid_t last_ptid; | |
3941 | int status; | |
d6b0e80f | 3942 | |
f973ed9c DJ |
3943 | /* If we're stopped while forking and we haven't followed yet, |
3944 | kill the other task. We need to do this first because the | |
3945 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3946 | |
f973ed9c | 3947 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3948 | |
f973ed9c DJ |
3949 | if (last.kind == TARGET_WAITKIND_FORKED |
3950 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3951 | { | |
3a3e9ee3 | 3952 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3953 | wait (&status); |
3954 | } | |
3955 | ||
3956 | if (forks_exist_p ()) | |
7feb7d06 | 3957 | linux_fork_killall (); |
f973ed9c DJ |
3958 | else |
3959 | { | |
d90e17a7 | 3960 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
e0881a8e | 3961 | |
4c28f408 PA |
3962 | /* Stop all threads before killing them, since ptrace requires |
3963 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3964 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3965 | /* ... and wait until all of them have reported back that |
3966 | they're no longer running. */ | |
d90e17a7 | 3967 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3968 | |
f973ed9c | 3969 | /* Kill all LWP's ... */ |
d90e17a7 | 3970 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3971 | |
3972 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3973 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3974 | } |
3975 | ||
3976 | target_mourn_inferior (); | |
d6b0e80f AC |
3977 | } |
3978 | ||
3979 | static void | |
136d6dae | 3980 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3981 | { |
d90e17a7 | 3982 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 3983 | |
f973ed9c | 3984 | if (! forks_exist_p ()) |
d90e17a7 PA |
3985 | /* Normal case, no other forks available. */ |
3986 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3987 | else |
3988 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3989 | there are other viable forks to debug. Delete the exiting | |
3990 | one and context-switch to the first available. */ | |
3991 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3992 | } |
3993 | ||
5b009018 PA |
3994 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3995 | layout of the inferiors' architecture. */ | |
3996 | ||
3997 | static void | |
3998 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
3999 | { | |
4000 | int done = 0; | |
4001 | ||
4002 | if (linux_nat_siginfo_fixup != NULL) | |
4003 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
4004 | ||
4005 | /* If there was no callback, or the callback didn't do anything, | |
4006 | then just do a straight memcpy. */ | |
4007 | if (!done) | |
4008 | { | |
4009 | if (direction == 1) | |
4010 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4011 | else | |
4012 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4013 | } | |
4014 | } | |
4015 | ||
4aa995e1 PA |
4016 | static LONGEST |
4017 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
4018 | const char *annex, gdb_byte *readbuf, | |
4019 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4020 | { | |
4aa995e1 PA |
4021 | int pid; |
4022 | struct siginfo siginfo; | |
5b009018 | 4023 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4024 | |
4025 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
4026 | gdb_assert (readbuf || writebuf); | |
4027 | ||
4028 | pid = GET_LWP (inferior_ptid); | |
4029 | if (pid == 0) | |
4030 | pid = GET_PID (inferior_ptid); | |
4031 | ||
4032 | if (offset > sizeof (siginfo)) | |
4033 | return -1; | |
4034 | ||
4035 | errno = 0; | |
4036 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
4037 | if (errno != 0) | |
4038 | return -1; | |
4039 | ||
5b009018 PA |
4040 | /* When GDB is built as a 64-bit application, ptrace writes into |
4041 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4042 | inferior with a 64-bit GDB should look the same as debugging it | |
4043 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
4044 | the converted layout, so any read/write will have to be done | |
4045 | post-conversion. */ | |
4046 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4047 | ||
4aa995e1 PA |
4048 | if (offset + len > sizeof (siginfo)) |
4049 | len = sizeof (siginfo) - offset; | |
4050 | ||
4051 | if (readbuf != NULL) | |
5b009018 | 4052 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4053 | else |
4054 | { | |
5b009018 PA |
4055 | memcpy (inf_siginfo + offset, writebuf, len); |
4056 | ||
4057 | /* Convert back to ptrace layout before flushing it out. */ | |
4058 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4059 | ||
4aa995e1 PA |
4060 | errno = 0; |
4061 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
4062 | if (errno != 0) | |
4063 | return -1; | |
4064 | } | |
4065 | ||
4066 | return len; | |
4067 | } | |
4068 | ||
10d6c8cd DJ |
4069 | static LONGEST |
4070 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
4071 | const char *annex, gdb_byte *readbuf, | |
4072 | const gdb_byte *writebuf, | |
4073 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 4074 | { |
4aa995e1 | 4075 | struct cleanup *old_chain; |
10d6c8cd | 4076 | LONGEST xfer; |
d6b0e80f | 4077 | |
4aa995e1 PA |
4078 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
4079 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
4080 | offset, len); | |
4081 | ||
c35b1492 PA |
4082 | /* The target is connected but no live inferior is selected. Pass |
4083 | this request down to a lower stratum (e.g., the executable | |
4084 | file). */ | |
4085 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
4086 | return 0; | |
4087 | ||
4aa995e1 PA |
4088 | old_chain = save_inferior_ptid (); |
4089 | ||
d6b0e80f AC |
4090 | if (is_lwp (inferior_ptid)) |
4091 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
4092 | ||
10d6c8cd DJ |
4093 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
4094 | offset, len); | |
d6b0e80f AC |
4095 | |
4096 | do_cleanups (old_chain); | |
4097 | return xfer; | |
4098 | } | |
4099 | ||
4100 | static int | |
28439f5e | 4101 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 4102 | { |
8c6a60d1 | 4103 | int err, tmp_errno; |
4c28f408 | 4104 | |
d6b0e80f AC |
4105 | gdb_assert (is_lwp (ptid)); |
4106 | ||
4c28f408 PA |
4107 | /* Send signal 0 instead of anything ptrace, because ptracing a |
4108 | running thread errors out claiming that the thread doesn't | |
4109 | exist. */ | |
4110 | err = kill_lwp (GET_LWP (ptid), 0); | |
8c6a60d1 | 4111 | tmp_errno = errno; |
d6b0e80f AC |
4112 | if (debug_linux_nat) |
4113 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 4114 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 4115 | target_pid_to_str (ptid), |
8c6a60d1 | 4116 | err ? safe_strerror (tmp_errno) : "OK"); |
9c0dd46b | 4117 | |
4c28f408 | 4118 | if (err != 0) |
d6b0e80f AC |
4119 | return 0; |
4120 | ||
4121 | return 1; | |
4122 | } | |
4123 | ||
28439f5e PA |
4124 | static int |
4125 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
4126 | { | |
4127 | return linux_thread_alive (ptid); | |
4128 | } | |
4129 | ||
d6b0e80f | 4130 | static char * |
117de6a9 | 4131 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
4132 | { |
4133 | static char buf[64]; | |
4134 | ||
a0ef4274 | 4135 | if (is_lwp (ptid) |
d90e17a7 PA |
4136 | && (GET_PID (ptid) != GET_LWP (ptid) |
4137 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
4138 | { |
4139 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
4140 | return buf; | |
4141 | } | |
4142 | ||
4143 | return normal_pid_to_str (ptid); | |
4144 | } | |
4145 | ||
4694da01 TT |
4146 | static char * |
4147 | linux_nat_thread_name (struct thread_info *thr) | |
4148 | { | |
4149 | int pid = ptid_get_pid (thr->ptid); | |
4150 | long lwp = ptid_get_lwp (thr->ptid); | |
4151 | #define FORMAT "/proc/%d/task/%ld/comm" | |
4152 | char buf[sizeof (FORMAT) + 30]; | |
4153 | FILE *comm_file; | |
4154 | char *result = NULL; | |
4155 | ||
4156 | snprintf (buf, sizeof (buf), FORMAT, pid, lwp); | |
4157 | comm_file = fopen (buf, "r"); | |
4158 | if (comm_file) | |
4159 | { | |
4160 | /* Not exported by the kernel, so we define it here. */ | |
4161 | #define COMM_LEN 16 | |
4162 | static char line[COMM_LEN + 1]; | |
4163 | ||
4164 | if (fgets (line, sizeof (line), comm_file)) | |
4165 | { | |
4166 | char *nl = strchr (line, '\n'); | |
4167 | ||
4168 | if (nl) | |
4169 | *nl = '\0'; | |
4170 | if (*line != '\0') | |
4171 | result = line; | |
4172 | } | |
4173 | ||
4174 | fclose (comm_file); | |
4175 | } | |
4176 | ||
4177 | #undef COMM_LEN | |
4178 | #undef FORMAT | |
4179 | ||
4180 | return result; | |
4181 | } | |
4182 | ||
dba24537 AC |
4183 | /* Accepts an integer PID; Returns a string representing a file that |
4184 | can be opened to get the symbols for the child process. */ | |
4185 | ||
6d8fd2b7 UW |
4186 | static char * |
4187 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
4188 | { |
4189 | char *name1, *name2; | |
4190 | ||
4191 | name1 = xmalloc (MAXPATHLEN); | |
4192 | name2 = xmalloc (MAXPATHLEN); | |
4193 | make_cleanup (xfree, name1); | |
4194 | make_cleanup (xfree, name2); | |
4195 | memset (name2, 0, MAXPATHLEN); | |
4196 | ||
4197 | sprintf (name1, "/proc/%d/exe", pid); | |
4198 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
4199 | return name2; | |
4200 | else | |
4201 | return name1; | |
4202 | } | |
4203 | ||
4204 | /* Service function for corefiles and info proc. */ | |
4205 | ||
4206 | static int | |
4207 | read_mapping (FILE *mapfile, | |
4208 | long long *addr, | |
4209 | long long *endaddr, | |
4210 | char *permissions, | |
4211 | long long *offset, | |
4212 | char *device, long long *inode, char *filename) | |
4213 | { | |
4214 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
4215 | addr, endaddr, permissions, offset, device, inode); | |
4216 | ||
2e14c2ea MS |
4217 | filename[0] = '\0'; |
4218 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
4219 | { |
4220 | /* Eat everything up to EOL for the filename. This will prevent | |
4221 | weird filenames (such as one with embedded whitespace) from | |
4222 | confusing this code. It also makes this code more robust in | |
4223 | respect to annotations the kernel may add after the filename. | |
4224 | ||
4225 | Note the filename is used for informational purposes | |
4226 | only. */ | |
4227 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
4228 | } | |
2e14c2ea | 4229 | |
dba24537 AC |
4230 | return (ret != 0 && ret != EOF); |
4231 | } | |
4232 | ||
4233 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
4234 | regions in the inferior for a corefile. */ | |
4235 | ||
4236 | static int | |
b8edc417 | 4237 | linux_nat_find_memory_regions (find_memory_region_ftype func, void *obfd) |
dba24537 | 4238 | { |
89ecc4f5 | 4239 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
4240 | char mapsfilename[MAXPATHLEN]; |
4241 | FILE *mapsfile; | |
4242 | long long addr, endaddr, size, offset, inode; | |
4243 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
4244 | int read, write, exec; | |
7c8a8b04 | 4245 | struct cleanup *cleanup; |
dba24537 AC |
4246 | |
4247 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 4248 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 4249 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 4250 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 4251 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
4252 | |
4253 | if (info_verbose) | |
4254 | fprintf_filtered (gdb_stdout, | |
4255 | "Reading memory regions from %s\n", mapsfilename); | |
4256 | ||
4257 | /* Now iterate until end-of-file. */ | |
4258 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
4259 | &offset, &device[0], &inode, &filename[0])) | |
4260 | { | |
4261 | size = endaddr - addr; | |
4262 | ||
4263 | /* Get the segment's permissions. */ | |
4264 | read = (strchr (permissions, 'r') != 0); | |
4265 | write = (strchr (permissions, 'w') != 0); | |
4266 | exec = (strchr (permissions, 'x') != 0); | |
4267 | ||
4268 | if (info_verbose) | |
4269 | { | |
4270 | fprintf_filtered (gdb_stdout, | |
2244ba2e PM |
4271 | "Save segment, %s bytes at %s (%c%c%c)", |
4272 | plongest (size), paddress (target_gdbarch, addr), | |
dba24537 AC |
4273 | read ? 'r' : ' ', |
4274 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 4275 | if (filename[0]) |
dba24537 AC |
4276 | fprintf_filtered (gdb_stdout, " for %s", filename); |
4277 | fprintf_filtered (gdb_stdout, "\n"); | |
4278 | } | |
4279 | ||
4280 | /* Invoke the callback function to create the corefile | |
4281 | segment. */ | |
4282 | func (addr, size, read, write, exec, obfd); | |
4283 | } | |
7c8a8b04 | 4284 | do_cleanups (cleanup); |
dba24537 AC |
4285 | return 0; |
4286 | } | |
4287 | ||
2020b7ab PA |
4288 | static int |
4289 | find_signalled_thread (struct thread_info *info, void *data) | |
4290 | { | |
16c381f0 | 4291 | if (info->suspend.stop_signal != TARGET_SIGNAL_0 |
2020b7ab PA |
4292 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) |
4293 | return 1; | |
4294 | ||
4295 | return 0; | |
4296 | } | |
4297 | ||
4298 | static enum target_signal | |
4299 | find_stop_signal (void) | |
4300 | { | |
4301 | struct thread_info *info = | |
4302 | iterate_over_threads (find_signalled_thread, NULL); | |
4303 | ||
4304 | if (info) | |
16c381f0 | 4305 | return info->suspend.stop_signal; |
2020b7ab PA |
4306 | else |
4307 | return TARGET_SIGNAL_0; | |
4308 | } | |
4309 | ||
dba24537 AC |
4310 | /* Records the thread's register state for the corefile note |
4311 | section. */ | |
4312 | ||
4313 | static char * | |
4314 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
4315 | char *note_data, int *note_size, |
4316 | enum target_signal stop_signal) | |
dba24537 | 4317 | { |
dba24537 | 4318 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
4319 | struct gdbarch *gdbarch = target_gdbarch; |
4320 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 4321 | const struct regset *regset; |
55e969c1 | 4322 | int core_regset_p; |
594f7785 | 4323 | struct cleanup *old_chain; |
17ea7499 CES |
4324 | struct core_regset_section *sect_list; |
4325 | char *gdb_regset; | |
594f7785 UW |
4326 | |
4327 | old_chain = save_inferior_ptid (); | |
4328 | inferior_ptid = ptid; | |
4329 | target_fetch_registers (regcache, -1); | |
4330 | do_cleanups (old_chain); | |
4f844a66 DM |
4331 | |
4332 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
4333 | sect_list = gdbarch_core_regset_sections (gdbarch); |
4334 | ||
17ea7499 CES |
4335 | /* The loop below uses the new struct core_regset_section, which stores |
4336 | the supported section names and sizes for the core file. Note that | |
4337 | note PRSTATUS needs to be treated specially. But the other notes are | |
4338 | structurally the same, so they can benefit from the new struct. */ | |
4339 | if (core_regset_p && sect_list != NULL) | |
4340 | while (sect_list->sect_name != NULL) | |
4341 | { | |
17ea7499 CES |
4342 | regset = gdbarch_regset_from_core_section (gdbarch, |
4343 | sect_list->sect_name, | |
4344 | sect_list->size); | |
4345 | gdb_assert (regset && regset->collect_regset); | |
4346 | gdb_regset = xmalloc (sect_list->size); | |
4347 | regset->collect_regset (regset, regcache, -1, | |
4348 | gdb_regset, sect_list->size); | |
2f2241f1 UW |
4349 | |
4350 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
4351 | note_data = (char *) elfcore_write_prstatus | |
4352 | (obfd, note_data, note_size, | |
857d11d0 JK |
4353 | lwp, target_signal_to_host (stop_signal), |
4354 | gdb_regset); | |
2f2241f1 UW |
4355 | else |
4356 | note_data = (char *) elfcore_write_register_note | |
4357 | (obfd, note_data, note_size, | |
4358 | sect_list->sect_name, gdb_regset, | |
4359 | sect_list->size); | |
17ea7499 CES |
4360 | xfree (gdb_regset); |
4361 | sect_list++; | |
4362 | } | |
dba24537 | 4363 | |
17ea7499 CES |
4364 | /* For architectures that does not have the struct core_regset_section |
4365 | implemented, we use the old method. When all the architectures have | |
4366 | the new support, the code below should be deleted. */ | |
4f844a66 | 4367 | else |
17ea7499 | 4368 | { |
2f2241f1 UW |
4369 | gdb_gregset_t gregs; |
4370 | gdb_fpregset_t fpregs; | |
4371 | ||
4372 | if (core_regset_p | |
4373 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3e43a32a MS |
4374 | sizeof (gregs))) |
4375 | != NULL && regset->collect_regset != NULL) | |
2f2241f1 UW |
4376 | regset->collect_regset (regset, regcache, -1, |
4377 | &gregs, sizeof (gregs)); | |
4378 | else | |
4379 | fill_gregset (regcache, &gregs, -1); | |
4380 | ||
857d11d0 JK |
4381 | note_data = (char *) elfcore_write_prstatus |
4382 | (obfd, note_data, note_size, lwp, target_signal_to_host (stop_signal), | |
4383 | &gregs); | |
2f2241f1 | 4384 | |
17ea7499 CES |
4385 | if (core_regset_p |
4386 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3e43a32a MS |
4387 | sizeof (fpregs))) |
4388 | != NULL && regset->collect_regset != NULL) | |
17ea7499 CES |
4389 | regset->collect_regset (regset, regcache, -1, |
4390 | &fpregs, sizeof (fpregs)); | |
4391 | else | |
4392 | fill_fpregset (regcache, &fpregs, -1); | |
4393 | ||
4394 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
4395 | note_data, | |
4396 | note_size, | |
4397 | &fpregs, sizeof (fpregs)); | |
4398 | } | |
4f844a66 | 4399 | |
dba24537 AC |
4400 | return note_data; |
4401 | } | |
4402 | ||
4403 | struct linux_nat_corefile_thread_data | |
4404 | { | |
4405 | bfd *obfd; | |
4406 | char *note_data; | |
4407 | int *note_size; | |
4408 | int num_notes; | |
2020b7ab | 4409 | enum target_signal stop_signal; |
dba24537 AC |
4410 | }; |
4411 | ||
4412 | /* Called by gdbthread.c once per thread. Records the thread's | |
4413 | register state for the corefile note section. */ | |
4414 | ||
4415 | static int | |
4416 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
4417 | { | |
4418 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 4419 | |
dba24537 AC |
4420 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
4421 | ti->ptid, | |
4422 | args->note_data, | |
2020b7ab PA |
4423 | args->note_size, |
4424 | args->stop_signal); | |
dba24537 | 4425 | args->num_notes++; |
56be3814 | 4426 | |
dba24537 AC |
4427 | return 0; |
4428 | } | |
4429 | ||
efcbbd14 UW |
4430 | /* Enumerate spufs IDs for process PID. */ |
4431 | ||
4432 | static void | |
4433 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
4434 | { | |
4435 | char path[128]; | |
4436 | DIR *dir; | |
4437 | struct dirent *entry; | |
4438 | ||
4439 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4440 | dir = opendir (path); | |
4441 | if (!dir) | |
4442 | return; | |
4443 | ||
4444 | rewinddir (dir); | |
4445 | while ((entry = readdir (dir)) != NULL) | |
4446 | { | |
4447 | struct stat st; | |
4448 | struct statfs stfs; | |
4449 | int fd; | |
4450 | ||
4451 | fd = atoi (entry->d_name); | |
4452 | if (!fd) | |
4453 | continue; | |
4454 | ||
4455 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4456 | if (stat (path, &st) != 0) | |
4457 | continue; | |
4458 | if (!S_ISDIR (st.st_mode)) | |
4459 | continue; | |
4460 | ||
4461 | if (statfs (path, &stfs) != 0) | |
4462 | continue; | |
4463 | if (stfs.f_type != SPUFS_MAGIC) | |
4464 | continue; | |
4465 | ||
4466 | callback (data, fd); | |
4467 | } | |
4468 | ||
4469 | closedir (dir); | |
4470 | } | |
4471 | ||
4472 | /* Generate corefile notes for SPU contexts. */ | |
4473 | ||
4474 | struct linux_spu_corefile_data | |
4475 | { | |
4476 | bfd *obfd; | |
4477 | char *note_data; | |
4478 | int *note_size; | |
4479 | }; | |
4480 | ||
4481 | static void | |
4482 | linux_spu_corefile_callback (void *data, int fd) | |
4483 | { | |
4484 | struct linux_spu_corefile_data *args = data; | |
4485 | int i; | |
4486 | ||
4487 | static const char *spu_files[] = | |
4488 | { | |
4489 | "object-id", | |
4490 | "mem", | |
4491 | "regs", | |
4492 | "fpcr", | |
4493 | "lslr", | |
4494 | "decr", | |
4495 | "decr_status", | |
4496 | "signal1", | |
4497 | "signal1_type", | |
4498 | "signal2", | |
4499 | "signal2_type", | |
4500 | "event_mask", | |
4501 | "event_status", | |
4502 | "mbox_info", | |
4503 | "ibox_info", | |
4504 | "wbox_info", | |
4505 | "dma_info", | |
4506 | "proxydma_info", | |
4507 | }; | |
4508 | ||
4509 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
4510 | { | |
4511 | char annex[32], note_name[32]; | |
4512 | gdb_byte *spu_data; | |
4513 | LONGEST spu_len; | |
4514 | ||
4515 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
4516 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
4517 | annex, &spu_data); | |
4518 | if (spu_len > 0) | |
4519 | { | |
4520 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
4521 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
4522 | args->note_size, note_name, | |
4523 | NT_SPU, spu_data, spu_len); | |
4524 | xfree (spu_data); | |
4525 | } | |
4526 | } | |
4527 | } | |
4528 | ||
4529 | static char * | |
4530 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
4531 | { | |
4532 | struct linux_spu_corefile_data args; | |
e0881a8e | 4533 | |
efcbbd14 UW |
4534 | args.obfd = obfd; |
4535 | args.note_data = note_data; | |
4536 | args.note_size = note_size; | |
4537 | ||
4538 | iterate_over_spus (PIDGET (inferior_ptid), | |
4539 | linux_spu_corefile_callback, &args); | |
4540 | ||
4541 | return args.note_data; | |
4542 | } | |
4543 | ||
dba24537 AC |
4544 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
4545 | section for a corefile, and returns it in a malloc buffer. */ | |
4546 | ||
4547 | static char * | |
4548 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
4549 | { | |
4550 | struct linux_nat_corefile_thread_data thread_args; | |
d99148ef | 4551 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 4552 | char fname[16] = { '\0' }; |
d99148ef | 4553 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
4554 | char psargs[80] = { '\0' }; |
4555 | char *note_data = NULL; | |
d90e17a7 | 4556 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 4557 | gdb_byte *auxv; |
dba24537 AC |
4558 | int auxv_len; |
4559 | ||
4560 | if (get_exec_file (0)) | |
4561 | { | |
9f37bbcc | 4562 | strncpy (fname, lbasename (get_exec_file (0)), sizeof (fname)); |
dba24537 AC |
4563 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); |
4564 | if (get_inferior_args ()) | |
4565 | { | |
d99148ef JK |
4566 | char *string_end; |
4567 | char *psargs_end = psargs + sizeof (psargs); | |
4568 | ||
4569 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
4570 | strings fine. */ | |
4571 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
4572 | if (string_end != NULL) | |
4573 | { | |
4574 | *string_end++ = ' '; | |
4575 | strncpy (string_end, get_inferior_args (), | |
4576 | psargs_end - string_end); | |
4577 | } | |
dba24537 AC |
4578 | } |
4579 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
4580 | note_data, | |
4581 | note_size, fname, psargs); | |
4582 | } | |
4583 | ||
4584 | /* Dump information for threads. */ | |
4585 | thread_args.obfd = obfd; | |
4586 | thread_args.note_data = note_data; | |
4587 | thread_args.note_size = note_size; | |
4588 | thread_args.num_notes = 0; | |
2020b7ab | 4589 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 4590 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
4591 | gdb_assert (thread_args.num_notes != 0); |
4592 | note_data = thread_args.note_data; | |
dba24537 | 4593 | |
13547ab6 DJ |
4594 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
4595 | NULL, &auxv); | |
dba24537 AC |
4596 | if (auxv_len > 0) |
4597 | { | |
4598 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
4599 | "CORE", NT_AUXV, auxv, auxv_len); | |
4600 | xfree (auxv); | |
4601 | } | |
4602 | ||
efcbbd14 UW |
4603 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
4604 | ||
dba24537 AC |
4605 | make_cleanup (xfree, note_data); |
4606 | return note_data; | |
4607 | } | |
4608 | ||
4609 | /* Implement the "info proc" command. */ | |
4610 | ||
4611 | static void | |
4612 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
4613 | { | |
89ecc4f5 DE |
4614 | /* A long is used for pid instead of an int to avoid a loss of precision |
4615 | compiler warning from the output of strtoul. */ | |
4616 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
4617 | FILE *procfile; |
4618 | char **argv = NULL; | |
4619 | char buffer[MAXPATHLEN]; | |
4620 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
4621 | int cmdline_f = 1; | |
4622 | int cwd_f = 1; | |
4623 | int exe_f = 1; | |
4624 | int mappings_f = 0; | |
dba24537 AC |
4625 | int status_f = 0; |
4626 | int stat_f = 0; | |
4627 | int all = 0; | |
4628 | struct stat dummy; | |
4629 | ||
4630 | if (args) | |
4631 | { | |
4632 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
4633 | argv = gdb_buildargv (args); |
4634 | make_cleanup_freeargv (argv); | |
dba24537 AC |
4635 | } |
4636 | while (argv != NULL && *argv != NULL) | |
4637 | { | |
4638 | if (isdigit (argv[0][0])) | |
4639 | { | |
4640 | pid = strtoul (argv[0], NULL, 10); | |
4641 | } | |
4642 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
4643 | { | |
4644 | mappings_f = 1; | |
4645 | } | |
4646 | else if (strcmp (argv[0], "status") == 0) | |
4647 | { | |
4648 | status_f = 1; | |
4649 | } | |
4650 | else if (strcmp (argv[0], "stat") == 0) | |
4651 | { | |
4652 | stat_f = 1; | |
4653 | } | |
4654 | else if (strcmp (argv[0], "cmd") == 0) | |
4655 | { | |
4656 | cmdline_f = 1; | |
4657 | } | |
4658 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
4659 | { | |
4660 | exe_f = 1; | |
4661 | } | |
4662 | else if (strcmp (argv[0], "cwd") == 0) | |
4663 | { | |
4664 | cwd_f = 1; | |
4665 | } | |
4666 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
4667 | { | |
4668 | all = 1; | |
4669 | } | |
4670 | else | |
4671 | { | |
1777feb0 | 4672 | /* [...] (future options here). */ |
dba24537 AC |
4673 | } |
4674 | argv++; | |
4675 | } | |
4676 | if (pid == 0) | |
8a3fe4f8 | 4677 | error (_("No current process: you must name one.")); |
dba24537 | 4678 | |
89ecc4f5 | 4679 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4680 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4681 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4682 | |
89ecc4f5 | 4683 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
4684 | if (cmdline_f || all) |
4685 | { | |
89ecc4f5 | 4686 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4687 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4688 | { |
7c8a8b04 | 4689 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4690 | |
bf1d7d9c JB |
4691 | if (fgets (buffer, sizeof (buffer), procfile)) |
4692 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4693 | else | |
4694 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4695 | do_cleanups (cleanup); |
dba24537 AC |
4696 | } |
4697 | else | |
8a3fe4f8 | 4698 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4699 | } |
4700 | if (cwd_f || all) | |
4701 | { | |
89ecc4f5 | 4702 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4703 | memset (fname2, 0, sizeof (fname2)); |
4704 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4705 | printf_filtered ("cwd = '%s'\n", fname2); | |
4706 | else | |
8a3fe4f8 | 4707 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4708 | } |
4709 | if (exe_f || all) | |
4710 | { | |
89ecc4f5 | 4711 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4712 | memset (fname2, 0, sizeof (fname2)); |
4713 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4714 | printf_filtered ("exe = '%s'\n", fname2); | |
4715 | else | |
8a3fe4f8 | 4716 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4717 | } |
4718 | if (mappings_f || all) | |
4719 | { | |
89ecc4f5 | 4720 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4721 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4722 | { |
4723 | long long addr, endaddr, size, offset, inode; | |
4724 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4725 | struct cleanup *cleanup; |
dba24537 | 4726 | |
7c8a8b04 | 4727 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4728 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4729 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4730 | { |
4731 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4732 | "Start Addr", | |
4733 | " End Addr", | |
4734 | " Size", " Offset", "objfile"); | |
4735 | } | |
4736 | else | |
4737 | { | |
4738 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4739 | "Start Addr", | |
4740 | " End Addr", | |
4741 | " Size", " Offset", "objfile"); | |
4742 | } | |
4743 | ||
4744 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4745 | &offset, &device[0], &inode, &filename[0])) | |
4746 | { | |
4747 | size = endaddr - addr; | |
4748 | ||
4749 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4750 | calls here (and possibly above) should be abstracted | |
4751 | out into their own functions? Andrew suggests using | |
4752 | a generic local_address_string instead to print out | |
4753 | the addresses; that makes sense to me, too. */ | |
4754 | ||
a97b0ac8 | 4755 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4756 | { |
4757 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4758 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4759 | (unsigned long) endaddr, | |
4760 | (int) size, | |
4761 | (unsigned int) offset, | |
4762 | filename[0] ? filename : ""); | |
4763 | } | |
4764 | else | |
4765 | { | |
4766 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4767 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4768 | (unsigned long) endaddr, | |
4769 | (int) size, | |
4770 | (unsigned int) offset, | |
4771 | filename[0] ? filename : ""); | |
4772 | } | |
4773 | } | |
4774 | ||
7c8a8b04 | 4775 | do_cleanups (cleanup); |
dba24537 AC |
4776 | } |
4777 | else | |
8a3fe4f8 | 4778 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4779 | } |
4780 | if (status_f || all) | |
4781 | { | |
89ecc4f5 | 4782 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4783 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4784 | { |
7c8a8b04 | 4785 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4786 | |
dba24537 AC |
4787 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4788 | puts_filtered (buffer); | |
7c8a8b04 | 4789 | do_cleanups (cleanup); |
dba24537 AC |
4790 | } |
4791 | else | |
8a3fe4f8 | 4792 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4793 | } |
4794 | if (stat_f || all) | |
4795 | { | |
89ecc4f5 | 4796 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4797 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4798 | { |
4799 | int itmp; | |
4800 | char ctmp; | |
a25694b4 | 4801 | long ltmp; |
7c8a8b04 | 4802 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4803 | |
4804 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4805 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4806 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4807 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4808 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4809 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4810 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4811 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4812 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4813 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4814 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4815 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4816 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4817 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4818 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4819 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4820 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4821 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4822 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4823 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4824 | (unsigned long) ltmp); | |
4825 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4826 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4827 | (unsigned long) ltmp); | |
4828 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4829 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4830 | (unsigned long) ltmp); | |
4831 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4832 | printf_filtered (_("Major faults, children: %lu\n"), | |
4833 | (unsigned long) ltmp); | |
4834 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4835 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4836 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4837 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4838 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4839 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4840 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4841 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4842 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4843 | printf_filtered (_("jiffies remaining in current " |
4844 | "time slice: %ld\n"), ltmp); | |
a25694b4 AS |
4845 | if (fscanf (procfile, "%ld ", <mp) > 0) |
4846 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4847 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4848 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4849 | (unsigned long) ltmp); | |
4850 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4851 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4852 | (unsigned long) ltmp); | |
4853 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4854 | printf_filtered (_("start time (jiffies since " |
4855 | "system boot): %ld\n"), ltmp); | |
a25694b4 AS |
4856 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4857 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4858 | (unsigned long) ltmp); | |
4859 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3e43a32a MS |
4860 | printf_filtered (_("Resident set size: %lu\n"), |
4861 | (unsigned long) ltmp); | |
a25694b4 AS |
4862 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4863 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4864 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4865 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4866 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4867 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4868 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4869 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
3e43a32a MS |
4870 | #if 0 /* Don't know how architecture-dependent the rest is... |
4871 | Anyway the signal bitmap info is available from "status". */ | |
1777feb0 | 4872 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4873 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); |
1777feb0 | 4874 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 AS |
4875 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); |
4876 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4877 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
4878 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4879 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
4880 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4881 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
4882 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4883 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
1777feb0 | 4884 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4885 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); |
dba24537 | 4886 | #endif |
7c8a8b04 | 4887 | do_cleanups (cleanup); |
dba24537 AC |
4888 | } |
4889 | else | |
8a3fe4f8 | 4890 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4891 | } |
4892 | } | |
4893 | ||
10d6c8cd DJ |
4894 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
4895 | filesystem. Because we can use a single read() call for /proc, this | |
4896 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
4897 | but it doesn't support writes. */ | |
4898 | ||
4899 | static LONGEST | |
4900 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
4901 | const char *annex, gdb_byte *readbuf, | |
4902 | const gdb_byte *writebuf, | |
4903 | ULONGEST offset, LONGEST len) | |
dba24537 | 4904 | { |
10d6c8cd DJ |
4905 | LONGEST ret; |
4906 | int fd; | |
dba24537 AC |
4907 | char filename[64]; |
4908 | ||
10d6c8cd | 4909 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
4910 | return 0; |
4911 | ||
4912 | /* Don't bother for one word. */ | |
4913 | if (len < 3 * sizeof (long)) | |
4914 | return 0; | |
4915 | ||
4916 | /* We could keep this file open and cache it - possibly one per | |
4917 | thread. That requires some juggling, but is even faster. */ | |
4918 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
4919 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
4920 | if (fd == -1) | |
4921 | return 0; | |
4922 | ||
4923 | /* If pread64 is available, use it. It's faster if the kernel | |
4924 | supports it (only one syscall), and it's 64-bit safe even on | |
4925 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4926 | application). */ | |
4927 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4928 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4929 | #else |
10d6c8cd | 4930 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4931 | #endif |
4932 | ret = 0; | |
4933 | else | |
4934 | ret = len; | |
4935 | ||
4936 | close (fd); | |
4937 | return ret; | |
4938 | } | |
4939 | ||
efcbbd14 UW |
4940 | |
4941 | /* Enumerate spufs IDs for process PID. */ | |
4942 | static LONGEST | |
4943 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
4944 | { | |
4945 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
4946 | LONGEST pos = 0; | |
4947 | LONGEST written = 0; | |
4948 | char path[128]; | |
4949 | DIR *dir; | |
4950 | struct dirent *entry; | |
4951 | ||
4952 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4953 | dir = opendir (path); | |
4954 | if (!dir) | |
4955 | return -1; | |
4956 | ||
4957 | rewinddir (dir); | |
4958 | while ((entry = readdir (dir)) != NULL) | |
4959 | { | |
4960 | struct stat st; | |
4961 | struct statfs stfs; | |
4962 | int fd; | |
4963 | ||
4964 | fd = atoi (entry->d_name); | |
4965 | if (!fd) | |
4966 | continue; | |
4967 | ||
4968 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4969 | if (stat (path, &st) != 0) | |
4970 | continue; | |
4971 | if (!S_ISDIR (st.st_mode)) | |
4972 | continue; | |
4973 | ||
4974 | if (statfs (path, &stfs) != 0) | |
4975 | continue; | |
4976 | if (stfs.f_type != SPUFS_MAGIC) | |
4977 | continue; | |
4978 | ||
4979 | if (pos >= offset && pos + 4 <= offset + len) | |
4980 | { | |
4981 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
4982 | written += 4; | |
4983 | } | |
4984 | pos += 4; | |
4985 | } | |
4986 | ||
4987 | closedir (dir); | |
4988 | return written; | |
4989 | } | |
4990 | ||
4991 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4992 | object type, using the /proc file system. */ | |
4993 | static LONGEST | |
4994 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
4995 | const char *annex, gdb_byte *readbuf, | |
4996 | const gdb_byte *writebuf, | |
4997 | ULONGEST offset, LONGEST len) | |
4998 | { | |
4999 | char buf[128]; | |
5000 | int fd = 0; | |
5001 | int ret = -1; | |
5002 | int pid = PIDGET (inferior_ptid); | |
5003 | ||
5004 | if (!annex) | |
5005 | { | |
5006 | if (!readbuf) | |
5007 | return -1; | |
5008 | else | |
5009 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5010 | } | |
5011 | ||
5012 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
5013 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5014 | if (fd <= 0) | |
5015 | return -1; | |
5016 | ||
5017 | if (offset != 0 | |
5018 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5019 | { | |
5020 | close (fd); | |
5021 | return 0; | |
5022 | } | |
5023 | ||
5024 | if (writebuf) | |
5025 | ret = write (fd, writebuf, (size_t) len); | |
5026 | else if (readbuf) | |
5027 | ret = read (fd, readbuf, (size_t) len); | |
5028 | ||
5029 | close (fd); | |
5030 | return ret; | |
5031 | } | |
5032 | ||
5033 | ||
dba24537 AC |
5034 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
5035 | ||
5036 | static void | |
5037 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
5038 | { | |
5039 | int len = strlen (line) - 1; | |
5040 | const char *p; | |
5041 | int signum; | |
5042 | ||
5043 | if (line[len] != '\n') | |
8a3fe4f8 | 5044 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
5045 | |
5046 | p = line; | |
5047 | signum = len * 4; | |
5048 | while (len-- > 0) | |
5049 | { | |
5050 | int digit; | |
5051 | ||
5052 | if (*p >= '0' && *p <= '9') | |
5053 | digit = *p - '0'; | |
5054 | else if (*p >= 'a' && *p <= 'f') | |
5055 | digit = *p - 'a' + 10; | |
5056 | else | |
8a3fe4f8 | 5057 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
5058 | |
5059 | signum -= 4; | |
5060 | ||
5061 | if (digit & 1) | |
5062 | sigaddset (sigs, signum + 1); | |
5063 | if (digit & 2) | |
5064 | sigaddset (sigs, signum + 2); | |
5065 | if (digit & 4) | |
5066 | sigaddset (sigs, signum + 3); | |
5067 | if (digit & 8) | |
5068 | sigaddset (sigs, signum + 4); | |
5069 | ||
5070 | p++; | |
5071 | } | |
5072 | } | |
5073 | ||
5074 | /* Find process PID's pending signals from /proc/pid/status and set | |
5075 | SIGS to match. */ | |
5076 | ||
5077 | void | |
3e43a32a MS |
5078 | linux_proc_pending_signals (int pid, sigset_t *pending, |
5079 | sigset_t *blocked, sigset_t *ignored) | |
dba24537 AC |
5080 | { |
5081 | FILE *procfile; | |
5082 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
7c8a8b04 | 5083 | struct cleanup *cleanup; |
dba24537 AC |
5084 | |
5085 | sigemptyset (pending); | |
5086 | sigemptyset (blocked); | |
5087 | sigemptyset (ignored); | |
5088 | sprintf (fname, "/proc/%d/status", pid); | |
5089 | procfile = fopen (fname, "r"); | |
5090 | if (procfile == NULL) | |
8a3fe4f8 | 5091 | error (_("Could not open %s"), fname); |
7c8a8b04 | 5092 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
5093 | |
5094 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
5095 | { | |
5096 | /* Normal queued signals are on the SigPnd line in the status | |
5097 | file. However, 2.6 kernels also have a "shared" pending | |
5098 | queue for delivering signals to a thread group, so check for | |
5099 | a ShdPnd line also. | |
5100 | ||
5101 | Unfortunately some Red Hat kernels include the shared pending | |
5102 | queue but not the ShdPnd status field. */ | |
5103 | ||
5104 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
5105 | add_line_to_sigset (buffer + 8, pending); | |
5106 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
5107 | add_line_to_sigset (buffer + 8, pending); | |
5108 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
5109 | add_line_to_sigset (buffer + 8, blocked); | |
5110 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
5111 | add_line_to_sigset (buffer + 8, ignored); | |
5112 | } | |
5113 | ||
7c8a8b04 | 5114 | do_cleanups (cleanup); |
dba24537 AC |
5115 | } |
5116 | ||
07e059b5 VP |
5117 | static LONGEST |
5118 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
e0881a8e MS |
5119 | const char *annex, gdb_byte *readbuf, |
5120 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
07e059b5 VP |
5121 | { |
5122 | /* We make the process list snapshot when the object starts to be | |
5123 | read. */ | |
5124 | static const char *buf; | |
5125 | static LONGEST len_avail = -1; | |
5126 | static struct obstack obstack; | |
5127 | ||
5128 | DIR *dirp; | |
5129 | ||
5130 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
5131 | ||
a61408f8 SS |
5132 | if (!annex) |
5133 | { | |
5134 | if (offset == 0) | |
5135 | { | |
5136 | if (len_avail != -1 && len_avail != 0) | |
5137 | obstack_free (&obstack, NULL); | |
5138 | len_avail = 0; | |
5139 | buf = NULL; | |
5140 | obstack_init (&obstack); | |
5141 | obstack_grow_str (&obstack, "<osdata type=\"types\">\n"); | |
5142 | ||
3e43a32a | 5143 | obstack_xml_printf (&obstack, |
a61408f8 SS |
5144 | "<item>" |
5145 | "<column name=\"Type\">processes</column>" | |
3e43a32a MS |
5146 | "<column name=\"Description\">" |
5147 | "Listing of all processes</column>" | |
a61408f8 SS |
5148 | "</item>"); |
5149 | ||
5150 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
5151 | buf = obstack_finish (&obstack); | |
5152 | len_avail = strlen (buf); | |
5153 | } | |
5154 | ||
5155 | if (offset >= len_avail) | |
5156 | { | |
5157 | /* Done. Get rid of the obstack. */ | |
5158 | obstack_free (&obstack, NULL); | |
5159 | buf = NULL; | |
5160 | len_avail = 0; | |
5161 | return 0; | |
5162 | } | |
5163 | ||
5164 | if (len > len_avail - offset) | |
5165 | len = len_avail - offset; | |
5166 | memcpy (readbuf, buf + offset, len); | |
5167 | ||
5168 | return len; | |
5169 | } | |
5170 | ||
07e059b5 VP |
5171 | if (strcmp (annex, "processes") != 0) |
5172 | return 0; | |
5173 | ||
5174 | gdb_assert (readbuf && !writebuf); | |
5175 | ||
5176 | if (offset == 0) | |
5177 | { | |
5178 | if (len_avail != -1 && len_avail != 0) | |
e0881a8e | 5179 | obstack_free (&obstack, NULL); |
07e059b5 VP |
5180 | len_avail = 0; |
5181 | buf = NULL; | |
5182 | obstack_init (&obstack); | |
5183 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
5184 | ||
5185 | dirp = opendir ("/proc"); | |
5186 | if (dirp) | |
e0881a8e MS |
5187 | { |
5188 | struct dirent *dp; | |
5189 | ||
5190 | while ((dp = readdir (dirp)) != NULL) | |
5191 | { | |
5192 | struct stat statbuf; | |
5193 | char procentry[sizeof ("/proc/4294967295")]; | |
5194 | ||
5195 | if (!isdigit (dp->d_name[0]) | |
5196 | || NAMELEN (dp) > sizeof ("4294967295") - 1) | |
5197 | continue; | |
5198 | ||
5199 | sprintf (procentry, "/proc/%s", dp->d_name); | |
5200 | if (stat (procentry, &statbuf) == 0 | |
5201 | && S_ISDIR (statbuf.st_mode)) | |
5202 | { | |
5203 | char *pathname; | |
5204 | FILE *f; | |
5205 | char cmd[MAXPATHLEN + 1]; | |
5206 | struct passwd *entry; | |
5207 | ||
5208 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
5209 | entry = getpwuid (statbuf.st_uid); | |
5210 | ||
5211 | if ((f = fopen (pathname, "r")) != NULL) | |
5212 | { | |
5eee517d | 5213 | size_t length = fread (cmd, 1, sizeof (cmd) - 1, f); |
e0881a8e | 5214 | |
5eee517d | 5215 | if (length > 0) |
e0881a8e MS |
5216 | { |
5217 | int i; | |
5218 | ||
5eee517d | 5219 | for (i = 0; i < length; i++) |
e0881a8e MS |
5220 | if (cmd[i] == '\0') |
5221 | cmd[i] = ' '; | |
5eee517d | 5222 | cmd[length] = '\0'; |
e0881a8e MS |
5223 | |
5224 | obstack_xml_printf ( | |
5225 | &obstack, | |
5226 | "<item>" | |
5227 | "<column name=\"pid\">%s</column>" | |
5228 | "<column name=\"user\">%s</column>" | |
5229 | "<column name=\"command\">%s</column>" | |
5230 | "</item>", | |
5231 | dp->d_name, | |
5232 | entry ? entry->pw_name : "?", | |
5233 | cmd); | |
5234 | } | |
5235 | fclose (f); | |
5236 | } | |
5237 | ||
5238 | xfree (pathname); | |
5239 | } | |
5240 | } | |
5241 | ||
5242 | closedir (dirp); | |
5243 | } | |
07e059b5 VP |
5244 | |
5245 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
5246 | buf = obstack_finish (&obstack); | |
5247 | len_avail = strlen (buf); | |
5248 | } | |
5249 | ||
5250 | if (offset >= len_avail) | |
5251 | { | |
5252 | /* Done. Get rid of the obstack. */ | |
5253 | obstack_free (&obstack, NULL); | |
5254 | buf = NULL; | |
5255 | len_avail = 0; | |
5256 | return 0; | |
5257 | } | |
5258 | ||
5259 | if (len > len_avail - offset) | |
5260 | len = len_avail - offset; | |
5261 | memcpy (readbuf, buf + offset, len); | |
5262 | ||
5263 | return len; | |
5264 | } | |
5265 | ||
10d6c8cd DJ |
5266 | static LONGEST |
5267 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
5268 | const char *annex, gdb_byte *readbuf, | |
5269 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
5270 | { | |
5271 | LONGEST xfer; | |
5272 | ||
5273 | if (object == TARGET_OBJECT_AUXV) | |
9f2982ff | 5274 | return memory_xfer_auxv (ops, object, annex, readbuf, writebuf, |
10d6c8cd DJ |
5275 | offset, len); |
5276 | ||
07e059b5 VP |
5277 | if (object == TARGET_OBJECT_OSDATA) |
5278 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
5279 | offset, len); | |
5280 | ||
efcbbd14 UW |
5281 | if (object == TARGET_OBJECT_SPU) |
5282 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
5283 | offset, len); | |
5284 | ||
8f313923 JK |
5285 | /* GDB calculates all the addresses in possibly larget width of the address. |
5286 | Address width needs to be masked before its final use - either by | |
5287 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
5288 | ||
5289 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
5290 | ||
5291 | if (object == TARGET_OBJECT_MEMORY) | |
5292 | { | |
5293 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
5294 | ||
5295 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
5296 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
5297 | } | |
5298 | ||
10d6c8cd DJ |
5299 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
5300 | offset, len); | |
5301 | if (xfer != 0) | |
5302 | return xfer; | |
5303 | ||
5304 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
5305 | offset, len); | |
5306 | } | |
5307 | ||
e9efe249 | 5308 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
5309 | it with local methods. */ |
5310 | ||
910122bf UW |
5311 | static void |
5312 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 5313 | { |
6d8fd2b7 | 5314 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
eb73ad13 | 5315 | t->to_remove_fork_catchpoint = linux_child_remove_fork_catchpoint; |
6d8fd2b7 | 5316 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; |
eb73ad13 | 5317 | t->to_remove_vfork_catchpoint = linux_child_remove_vfork_catchpoint; |
6d8fd2b7 | 5318 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; |
eb73ad13 | 5319 | t->to_remove_exec_catchpoint = linux_child_remove_exec_catchpoint; |
a96d9b2e | 5320 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 5321 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 5322 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
5323 | t->to_post_attach = linux_child_post_attach; |
5324 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
5325 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
5326 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
5327 | ||
5328 | super_xfer_partial = t->to_xfer_partial; | |
5329 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
5330 | } |
5331 | ||
5332 | struct target_ops * | |
5333 | linux_target (void) | |
5334 | { | |
5335 | struct target_ops *t; | |
5336 | ||
5337 | t = inf_ptrace_target (); | |
5338 | linux_target_install_ops (t); | |
5339 | ||
5340 | return t; | |
5341 | } | |
5342 | ||
5343 | struct target_ops * | |
7714d83a | 5344 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
5345 | { |
5346 | struct target_ops *t; | |
5347 | ||
5348 | t = inf_ptrace_trad_target (register_u_offset); | |
5349 | linux_target_install_ops (t); | |
10d6c8cd | 5350 | |
10d6c8cd DJ |
5351 | return t; |
5352 | } | |
5353 | ||
b84876c2 PA |
5354 | /* target_is_async_p implementation. */ |
5355 | ||
5356 | static int | |
5357 | linux_nat_is_async_p (void) | |
5358 | { | |
5359 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5360 | it explicitly with the "set target-async" command. |
b84876c2 | 5361 | Someday, linux will always be async. */ |
c6ebd6cf | 5362 | if (!target_async_permitted) |
b84876c2 PA |
5363 | return 0; |
5364 | ||
d90e17a7 PA |
5365 | /* See target.h/target_async_mask. */ |
5366 | return linux_nat_async_mask_value; | |
b84876c2 PA |
5367 | } |
5368 | ||
5369 | /* target_can_async_p implementation. */ | |
5370 | ||
5371 | static int | |
5372 | linux_nat_can_async_p (void) | |
5373 | { | |
5374 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5375 | it explicitly with the "set target-async" command. |
b84876c2 | 5376 | Someday, linux will always be async. */ |
c6ebd6cf | 5377 | if (!target_async_permitted) |
b84876c2 PA |
5378 | return 0; |
5379 | ||
5380 | /* See target.h/target_async_mask. */ | |
5381 | return linux_nat_async_mask_value; | |
5382 | } | |
5383 | ||
9908b566 VP |
5384 | static int |
5385 | linux_nat_supports_non_stop (void) | |
5386 | { | |
5387 | return 1; | |
5388 | } | |
5389 | ||
d90e17a7 PA |
5390 | /* True if we want to support multi-process. To be removed when GDB |
5391 | supports multi-exec. */ | |
5392 | ||
2277426b | 5393 | int linux_multi_process = 1; |
d90e17a7 PA |
5394 | |
5395 | static int | |
5396 | linux_nat_supports_multi_process (void) | |
5397 | { | |
5398 | return linux_multi_process; | |
5399 | } | |
5400 | ||
b84876c2 PA |
5401 | /* target_async_mask implementation. */ |
5402 | ||
5403 | static int | |
7feb7d06 | 5404 | linux_nat_async_mask (int new_mask) |
b84876c2 | 5405 | { |
7feb7d06 | 5406 | int curr_mask = linux_nat_async_mask_value; |
b84876c2 | 5407 | |
7feb7d06 | 5408 | if (curr_mask != new_mask) |
b84876c2 | 5409 | { |
7feb7d06 | 5410 | if (new_mask == 0) |
b84876c2 PA |
5411 | { |
5412 | linux_nat_async (NULL, 0); | |
7feb7d06 | 5413 | linux_nat_async_mask_value = new_mask; |
b84876c2 PA |
5414 | } |
5415 | else | |
5416 | { | |
7feb7d06 | 5417 | linux_nat_async_mask_value = new_mask; |
84e46146 | 5418 | |
7feb7d06 PA |
5419 | /* If we're going out of async-mask in all-stop, then the |
5420 | inferior is stopped. The next resume will call | |
5421 | target_async. In non-stop, the target event source | |
5422 | should be always registered in the event loop. Do so | |
5423 | now. */ | |
5424 | if (non_stop) | |
5425 | linux_nat_async (inferior_event_handler, 0); | |
b84876c2 PA |
5426 | } |
5427 | } | |
5428 | ||
7feb7d06 | 5429 | return curr_mask; |
b84876c2 PA |
5430 | } |
5431 | ||
5432 | static int async_terminal_is_ours = 1; | |
5433 | ||
5434 | /* target_terminal_inferior implementation. */ | |
5435 | ||
5436 | static void | |
5437 | linux_nat_terminal_inferior (void) | |
5438 | { | |
5439 | if (!target_is_async_p ()) | |
5440 | { | |
5441 | /* Async mode is disabled. */ | |
5442 | terminal_inferior (); | |
5443 | return; | |
5444 | } | |
5445 | ||
b84876c2 PA |
5446 | terminal_inferior (); |
5447 | ||
d9d2d8b6 | 5448 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
5449 | if (!async_terminal_is_ours) |
5450 | return; | |
5451 | ||
5452 | delete_file_handler (input_fd); | |
5453 | async_terminal_is_ours = 0; | |
5454 | set_sigint_trap (); | |
5455 | } | |
5456 | ||
5457 | /* target_terminal_ours implementation. */ | |
5458 | ||
2c0b251b | 5459 | static void |
b84876c2 PA |
5460 | linux_nat_terminal_ours (void) |
5461 | { | |
5462 | if (!target_is_async_p ()) | |
5463 | { | |
5464 | /* Async mode is disabled. */ | |
5465 | terminal_ours (); | |
5466 | return; | |
5467 | } | |
5468 | ||
5469 | /* GDB should never give the terminal to the inferior if the | |
5470 | inferior is running in the background (run&, continue&, etc.), | |
5471 | but claiming it sure should. */ | |
5472 | terminal_ours (); | |
5473 | ||
b84876c2 PA |
5474 | if (async_terminal_is_ours) |
5475 | return; | |
5476 | ||
5477 | clear_sigint_trap (); | |
5478 | add_file_handler (input_fd, stdin_event_handler, 0); | |
5479 | async_terminal_is_ours = 1; | |
5480 | } | |
5481 | ||
5482 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
5483 | void *context); | |
5484 | static void *async_client_context; | |
5485 | ||
7feb7d06 PA |
5486 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5487 | so we notice when any child changes state, and notify the | |
5488 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
5489 | above to wait for the arrival of a SIGCHLD. */ | |
5490 | ||
b84876c2 | 5491 | static void |
7feb7d06 | 5492 | sigchld_handler (int signo) |
b84876c2 | 5493 | { |
7feb7d06 PA |
5494 | int old_errno = errno; |
5495 | ||
01124a23 DE |
5496 | if (debug_linux_nat) |
5497 | ui_file_write_async_safe (gdb_stdlog, | |
5498 | "sigchld\n", sizeof ("sigchld\n") - 1); | |
7feb7d06 PA |
5499 | |
5500 | if (signo == SIGCHLD | |
5501 | && linux_nat_event_pipe[0] != -1) | |
5502 | async_file_mark (); /* Let the event loop know that there are | |
5503 | events to handle. */ | |
5504 | ||
5505 | errno = old_errno; | |
5506 | } | |
5507 | ||
5508 | /* Callback registered with the target events file descriptor. */ | |
5509 | ||
5510 | static void | |
5511 | handle_target_event (int error, gdb_client_data client_data) | |
5512 | { | |
5513 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
5514 | } | |
5515 | ||
5516 | /* Create/destroy the target events pipe. Returns previous state. */ | |
5517 | ||
5518 | static int | |
5519 | linux_async_pipe (int enable) | |
5520 | { | |
5521 | int previous = (linux_nat_event_pipe[0] != -1); | |
5522 | ||
5523 | if (previous != enable) | |
5524 | { | |
5525 | sigset_t prev_mask; | |
5526 | ||
5527 | block_child_signals (&prev_mask); | |
5528 | ||
5529 | if (enable) | |
5530 | { | |
5531 | if (pipe (linux_nat_event_pipe) == -1) | |
5532 | internal_error (__FILE__, __LINE__, | |
5533 | "creating event pipe failed."); | |
5534 | ||
5535 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5536 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5537 | } | |
5538 | else | |
5539 | { | |
5540 | close (linux_nat_event_pipe[0]); | |
5541 | close (linux_nat_event_pipe[1]); | |
5542 | linux_nat_event_pipe[0] = -1; | |
5543 | linux_nat_event_pipe[1] = -1; | |
5544 | } | |
5545 | ||
5546 | restore_child_signals_mask (&prev_mask); | |
5547 | } | |
5548 | ||
5549 | return previous; | |
b84876c2 PA |
5550 | } |
5551 | ||
5552 | /* target_async implementation. */ | |
5553 | ||
5554 | static void | |
5555 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
5556 | void *context), void *context) | |
5557 | { | |
c6ebd6cf | 5558 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
5559 | internal_error (__FILE__, __LINE__, |
5560 | "Calling target_async when async is masked"); | |
5561 | ||
5562 | if (callback != NULL) | |
5563 | { | |
5564 | async_client_callback = callback; | |
5565 | async_client_context = context; | |
7feb7d06 PA |
5566 | if (!linux_async_pipe (1)) |
5567 | { | |
5568 | add_file_handler (linux_nat_event_pipe[0], | |
5569 | handle_target_event, NULL); | |
5570 | /* There may be pending events to handle. Tell the event loop | |
5571 | to poll them. */ | |
5572 | async_file_mark (); | |
5573 | } | |
b84876c2 PA |
5574 | } |
5575 | else | |
5576 | { | |
5577 | async_client_callback = callback; | |
5578 | async_client_context = context; | |
b84876c2 | 5579 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 5580 | linux_async_pipe (0); |
b84876c2 PA |
5581 | } |
5582 | return; | |
5583 | } | |
5584 | ||
252fbfc8 PA |
5585 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
5586 | event came out. */ | |
5587 | ||
4c28f408 | 5588 | static int |
252fbfc8 | 5589 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 5590 | { |
d90e17a7 | 5591 | if (!lwp->stopped) |
252fbfc8 | 5592 | { |
d90e17a7 | 5593 | ptid_t ptid = lwp->ptid; |
252fbfc8 | 5594 | |
d90e17a7 PA |
5595 | if (debug_linux_nat) |
5596 | fprintf_unfiltered (gdb_stdlog, | |
5597 | "LNSL: running -> suspending %s\n", | |
5598 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 5599 | |
252fbfc8 | 5600 | |
d90e17a7 PA |
5601 | stop_callback (lwp, NULL); |
5602 | stop_wait_callback (lwp, NULL); | |
252fbfc8 | 5603 | |
d90e17a7 PA |
5604 | /* If the lwp exits while we try to stop it, there's nothing |
5605 | else to do. */ | |
5606 | lwp = find_lwp_pid (ptid); | |
5607 | if (lwp == NULL) | |
5608 | return 0; | |
252fbfc8 | 5609 | |
d90e17a7 PA |
5610 | /* If we didn't collect any signal other than SIGSTOP while |
5611 | stopping the LWP, push a SIGNAL_0 event. In either case, the | |
5612 | event-loop will end up calling target_wait which will collect | |
5613 | these. */ | |
5614 | if (lwp->status == 0) | |
5615 | lwp->status = W_STOPCODE (0); | |
5616 | async_file_mark (); | |
5617 | } | |
5618 | else | |
5619 | { | |
5620 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 5621 | |
d90e17a7 PA |
5622 | if (debug_linux_nat) |
5623 | { | |
e09875d4 | 5624 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
3e43a32a MS |
5625 | fprintf_unfiltered (gdb_stdlog, |
5626 | "LNSL: already stopped/stop_requested %s\n", | |
d90e17a7 PA |
5627 | target_pid_to_str (lwp->ptid)); |
5628 | else | |
3e43a32a MS |
5629 | fprintf_unfiltered (gdb_stdlog, |
5630 | "LNSL: already stopped/no " | |
5631 | "stop_requested yet %s\n", | |
d90e17a7 | 5632 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
5633 | } |
5634 | } | |
4c28f408 PA |
5635 | return 0; |
5636 | } | |
5637 | ||
5638 | static void | |
5639 | linux_nat_stop (ptid_t ptid) | |
5640 | { | |
5641 | if (non_stop) | |
d90e17a7 | 5642 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
5643 | else |
5644 | linux_ops->to_stop (ptid); | |
5645 | } | |
5646 | ||
d90e17a7 PA |
5647 | static void |
5648 | linux_nat_close (int quitting) | |
5649 | { | |
5650 | /* Unregister from the event loop. */ | |
5651 | if (target_is_async_p ()) | |
5652 | target_async (NULL, 0); | |
5653 | ||
5654 | /* Reset the async_masking. */ | |
5655 | linux_nat_async_mask_value = 1; | |
5656 | ||
5657 | if (linux_ops->to_close) | |
5658 | linux_ops->to_close (quitting); | |
5659 | } | |
5660 | ||
c0694254 PA |
5661 | /* When requests are passed down from the linux-nat layer to the |
5662 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
5663 | used. The address space pointer is stored in the inferior object, | |
5664 | but the common code that is passed such ptid can't tell whether | |
5665 | lwpid is a "main" process id or not (it assumes so). We reverse | |
5666 | look up the "main" process id from the lwp here. */ | |
5667 | ||
5668 | struct address_space * | |
5669 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) | |
5670 | { | |
5671 | struct lwp_info *lwp; | |
5672 | struct inferior *inf; | |
5673 | int pid; | |
5674 | ||
5675 | pid = GET_LWP (ptid); | |
5676 | if (GET_LWP (ptid) == 0) | |
5677 | { | |
5678 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
5679 | tgid. */ | |
5680 | lwp = find_lwp_pid (ptid); | |
5681 | pid = GET_PID (lwp->ptid); | |
5682 | } | |
5683 | else | |
5684 | { | |
5685 | /* A (pid,lwpid,0) ptid. */ | |
5686 | pid = GET_PID (ptid); | |
5687 | } | |
5688 | ||
5689 | inf = find_inferior_pid (pid); | |
5690 | gdb_assert (inf != NULL); | |
5691 | return inf->aspace; | |
5692 | } | |
5693 | ||
dc146f7c VP |
5694 | int |
5695 | linux_nat_core_of_thread_1 (ptid_t ptid) | |
5696 | { | |
5697 | struct cleanup *back_to; | |
5698 | char *filename; | |
5699 | FILE *f; | |
5700 | char *content = NULL; | |
5701 | char *p; | |
5702 | char *ts = 0; | |
5703 | int content_read = 0; | |
5704 | int i; | |
5705 | int core; | |
5706 | ||
5707 | filename = xstrprintf ("/proc/%d/task/%ld/stat", | |
5708 | GET_PID (ptid), GET_LWP (ptid)); | |
5709 | back_to = make_cleanup (xfree, filename); | |
5710 | ||
5711 | f = fopen (filename, "r"); | |
5712 | if (!f) | |
5713 | { | |
5714 | do_cleanups (back_to); | |
5715 | return -1; | |
5716 | } | |
5717 | ||
5718 | make_cleanup_fclose (f); | |
5719 | ||
5720 | for (;;) | |
5721 | { | |
5722 | int n; | |
e0881a8e | 5723 | |
dc146f7c VP |
5724 | content = xrealloc (content, content_read + 1024); |
5725 | n = fread (content + content_read, 1, 1024, f); | |
5726 | content_read += n; | |
5727 | if (n < 1024) | |
5728 | { | |
5729 | content[content_read] = '\0'; | |
5730 | break; | |
5731 | } | |
5732 | } | |
5733 | ||
5734 | make_cleanup (xfree, content); | |
5735 | ||
5736 | p = strchr (content, '('); | |
ca2a87a0 JK |
5737 | |
5738 | /* Skip ")". */ | |
5739 | if (p != NULL) | |
5740 | p = strchr (p, ')'); | |
5741 | if (p != NULL) | |
5742 | p++; | |
dc146f7c VP |
5743 | |
5744 | /* If the first field after program name has index 0, then core number is | |
5745 | the field with index 36. There's no constant for that anywhere. */ | |
ca2a87a0 JK |
5746 | if (p != NULL) |
5747 | p = strtok_r (p, " ", &ts); | |
5748 | for (i = 0; p != NULL && i != 36; ++i) | |
dc146f7c VP |
5749 | p = strtok_r (NULL, " ", &ts); |
5750 | ||
ca2a87a0 | 5751 | if (p == NULL || sscanf (p, "%d", &core) == 0) |
dc146f7c VP |
5752 | core = -1; |
5753 | ||
5754 | do_cleanups (back_to); | |
5755 | ||
5756 | return core; | |
5757 | } | |
5758 | ||
5759 | /* Return the cached value of the processor core for thread PTID. */ | |
5760 | ||
5761 | int | |
5762 | linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid) | |
5763 | { | |
5764 | struct lwp_info *info = find_lwp_pid (ptid); | |
e0881a8e | 5765 | |
dc146f7c VP |
5766 | if (info) |
5767 | return info->core; | |
5768 | return -1; | |
5769 | } | |
5770 | ||
f973ed9c DJ |
5771 | void |
5772 | linux_nat_add_target (struct target_ops *t) | |
5773 | { | |
f973ed9c DJ |
5774 | /* Save the provided single-threaded target. We save this in a separate |
5775 | variable because another target we've inherited from (e.g. inf-ptrace) | |
5776 | may have saved a pointer to T; we want to use it for the final | |
5777 | process stratum target. */ | |
5778 | linux_ops_saved = *t; | |
5779 | linux_ops = &linux_ops_saved; | |
5780 | ||
5781 | /* Override some methods for multithreading. */ | |
b84876c2 | 5782 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
5783 | t->to_attach = linux_nat_attach; |
5784 | t->to_detach = linux_nat_detach; | |
5785 | t->to_resume = linux_nat_resume; | |
5786 | t->to_wait = linux_nat_wait; | |
2455069d | 5787 | t->to_pass_signals = linux_nat_pass_signals; |
f973ed9c DJ |
5788 | t->to_xfer_partial = linux_nat_xfer_partial; |
5789 | t->to_kill = linux_nat_kill; | |
5790 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
5791 | t->to_thread_alive = linux_nat_thread_alive; | |
5792 | t->to_pid_to_str = linux_nat_pid_to_str; | |
4694da01 | 5793 | t->to_thread_name = linux_nat_thread_name; |
f973ed9c | 5794 | t->to_has_thread_control = tc_schedlock; |
c0694254 | 5795 | t->to_thread_address_space = linux_nat_thread_address_space; |
ebec9a0f PA |
5796 | t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint; |
5797 | t->to_stopped_data_address = linux_nat_stopped_data_address; | |
f973ed9c | 5798 | |
b84876c2 PA |
5799 | t->to_can_async_p = linux_nat_can_async_p; |
5800 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5801 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
5802 | t->to_async = linux_nat_async; |
5803 | t->to_async_mask = linux_nat_async_mask; | |
5804 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
5805 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5806 | t->to_close = linux_nat_close; |
b84876c2 | 5807 | |
4c28f408 PA |
5808 | /* Methods for non-stop support. */ |
5809 | t->to_stop = linux_nat_stop; | |
5810 | ||
d90e17a7 PA |
5811 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5812 | ||
dc146f7c VP |
5813 | t->to_core_of_thread = linux_nat_core_of_thread; |
5814 | ||
f973ed9c DJ |
5815 | /* We don't change the stratum; this target will sit at |
5816 | process_stratum and thread_db will set at thread_stratum. This | |
5817 | is a little strange, since this is a multi-threaded-capable | |
5818 | target, but we want to be on the stack below thread_db, and we | |
5819 | also want to be used for single-threaded processes. */ | |
5820 | ||
5821 | add_target (t); | |
f973ed9c DJ |
5822 | } |
5823 | ||
9f0bdab8 DJ |
5824 | /* Register a method to call whenever a new thread is attached. */ |
5825 | void | |
5826 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5827 | { | |
5828 | /* Save the pointer. We only support a single registered instance | |
5829 | of the GNU/Linux native target, so we do not need to map this to | |
5830 | T. */ | |
5831 | linux_nat_new_thread = new_thread; | |
5832 | } | |
5833 | ||
5b009018 PA |
5834 | /* Register a method that converts a siginfo object between the layout |
5835 | that ptrace returns, and the layout in the architecture of the | |
5836 | inferior. */ | |
5837 | void | |
5838 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5839 | int (*siginfo_fixup) (struct siginfo *, | |
5840 | gdb_byte *, | |
5841 | int)) | |
5842 | { | |
5843 | /* Save the pointer. */ | |
5844 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5845 | } | |
5846 | ||
9f0bdab8 DJ |
5847 | /* Return the saved siginfo associated with PTID. */ |
5848 | struct siginfo * | |
5849 | linux_nat_get_siginfo (ptid_t ptid) | |
5850 | { | |
5851 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5852 | ||
5853 | gdb_assert (lp != NULL); | |
5854 | ||
5855 | return &lp->siginfo; | |
5856 | } | |
5857 | ||
2c0b251b PA |
5858 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5859 | extern initialize_file_ftype _initialize_linux_nat; | |
5860 | ||
d6b0e80f AC |
5861 | void |
5862 | _initialize_linux_nat (void) | |
5863 | { | |
1bedd215 AC |
5864 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
5865 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
5866 | Specify any process id, or use the program being debugged by default.\n\ |
5867 | Specify any of the following keywords for detailed info:\n\ | |
5868 | mappings -- list of mapped memory regions.\n\ | |
5869 | stat -- list a bunch of random process info.\n\ | |
5870 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 5871 | all -- list all available /proc info.")); |
d6b0e80f | 5872 | |
b84876c2 PA |
5873 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5874 | &debug_linux_nat, _("\ | |
5875 | Set debugging of GNU/Linux lwp module."), _("\ | |
5876 | Show debugging of GNU/Linux lwp module."), _("\ | |
5877 | Enables printf debugging output."), | |
5878 | NULL, | |
5879 | show_debug_linux_nat, | |
5880 | &setdebuglist, &showdebuglist); | |
5881 | ||
b84876c2 | 5882 | /* Save this mask as the default. */ |
d6b0e80f AC |
5883 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5884 | ||
7feb7d06 PA |
5885 | /* Install a SIGCHLD handler. */ |
5886 | sigchld_action.sa_handler = sigchld_handler; | |
5887 | sigemptyset (&sigchld_action.sa_mask); | |
5888 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5889 | |
5890 | /* Make it the default. */ | |
7feb7d06 | 5891 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5892 | |
5893 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5894 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5895 | sigdelset (&suspend_mask, SIGCHLD); | |
5896 | ||
7feb7d06 | 5897 | sigemptyset (&blocked_mask); |
10568435 JK |
5898 | |
5899 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
5900 | &disable_randomization, _("\ | |
5901 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
5902 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
5903 | When this mode is on (which is the default), randomization of the virtual\n\ | |
5904 | address space is disabled. Standalone programs run with the randomization\n\ | |
5905 | enabled by default on some platforms."), | |
5906 | &set_disable_randomization, | |
5907 | &show_disable_randomization, | |
5908 | &setlist, &showlist); | |
d6b0e80f AC |
5909 | } |
5910 | \f | |
5911 | ||
5912 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5913 | the GNU/Linux Threads library and therefore doesn't really belong | |
5914 | here. */ | |
5915 | ||
5916 | /* Read variable NAME in the target and return its value if found. | |
5917 | Otherwise return zero. It is assumed that the type of the variable | |
5918 | is `int'. */ | |
5919 | ||
5920 | static int | |
5921 | get_signo (const char *name) | |
5922 | { | |
5923 | struct minimal_symbol *ms; | |
5924 | int signo; | |
5925 | ||
5926 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5927 | if (ms == NULL) | |
5928 | return 0; | |
5929 | ||
8e70166d | 5930 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5931 | sizeof (signo)) != 0) |
5932 | return 0; | |
5933 | ||
5934 | return signo; | |
5935 | } | |
5936 | ||
5937 | /* Return the set of signals used by the threads library in *SET. */ | |
5938 | ||
5939 | void | |
5940 | lin_thread_get_thread_signals (sigset_t *set) | |
5941 | { | |
5942 | struct sigaction action; | |
5943 | int restart, cancel; | |
5944 | ||
b84876c2 | 5945 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5946 | sigemptyset (set); |
5947 | ||
5948 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5949 | cancel = get_signo ("__pthread_sig_cancel"); |
5950 | ||
5951 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5952 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5953 | not provide any way for the debugger to query the signal numbers - | |
5954 | fortunately they don't change! */ | |
5955 | ||
d6b0e80f | 5956 | if (restart == 0) |
17fbb0bd | 5957 | restart = __SIGRTMIN; |
d6b0e80f | 5958 | |
d6b0e80f | 5959 | if (cancel == 0) |
17fbb0bd | 5960 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5961 | |
5962 | sigaddset (set, restart); | |
5963 | sigaddset (set, cancel); | |
5964 | ||
5965 | /* The GNU/Linux Threads library makes terminating threads send a | |
5966 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
5967 | those (to prevent them from terminating GDB itself, which is | |
5968 | likely to be their default action) and treat them the same way as | |
5969 | SIGCHLD. */ | |
5970 | ||
5971 | action.sa_handler = sigchld_handler; | |
5972 | sigemptyset (&action.sa_mask); | |
58aecb61 | 5973 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
5974 | sigaction (cancel, &action, NULL); |
5975 | ||
5976 | /* We block the "cancel" signal throughout this code ... */ | |
5977 | sigaddset (&blocked_mask, cancel); | |
5978 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
5979 | ||
5980 | /* ... except during a sigsuspend. */ | |
5981 | sigdelset (&suspend_mask, cancel); | |
5982 | } |