Commit | Line | Data |
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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
0fb0cc75 | 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
e26af52f | 4 | Free Software Foundation, Inc. |
3993f6b1 DJ |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
3993f6b1 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
3993f6b1 DJ |
20 | |
21 | #include "defs.h" | |
22 | #include "inferior.h" | |
23 | #include "target.h" | |
d6b0e80f | 24 | #include "gdb_string.h" |
3993f6b1 | 25 | #include "gdb_wait.h" |
d6b0e80f AC |
26 | #include "gdb_assert.h" |
27 | #ifdef HAVE_TKILL_SYSCALL | |
28 | #include <unistd.h> | |
29 | #include <sys/syscall.h> | |
30 | #endif | |
3993f6b1 | 31 | #include <sys/ptrace.h> |
0274a8ce | 32 | #include "linux-nat.h" |
ac264b3b | 33 | #include "linux-fork.h" |
d6b0e80f AC |
34 | #include "gdbthread.h" |
35 | #include "gdbcmd.h" | |
36 | #include "regcache.h" | |
4f844a66 | 37 | #include "regset.h" |
10d6c8cd DJ |
38 | #include "inf-ptrace.h" |
39 | #include "auxv.h" | |
dba24537 AC |
40 | #include <sys/param.h> /* for MAXPATHLEN */ |
41 | #include <sys/procfs.h> /* for elf_gregset etc. */ | |
42 | #include "elf-bfd.h" /* for elfcore_write_* */ | |
43 | #include "gregset.h" /* for gregset */ | |
44 | #include "gdbcore.h" /* for get_exec_file */ | |
45 | #include <ctype.h> /* for isdigit */ | |
46 | #include "gdbthread.h" /* for struct thread_info etc. */ | |
47 | #include "gdb_stat.h" /* for struct stat */ | |
48 | #include <fcntl.h> /* for O_RDONLY */ | |
b84876c2 PA |
49 | #include "inf-loop.h" |
50 | #include "event-loop.h" | |
51 | #include "event-top.h" | |
07e059b5 VP |
52 | #include <pwd.h> |
53 | #include <sys/types.h> | |
54 | #include "gdb_dirent.h" | |
55 | #include "xml-support.h" | |
191c4426 | 56 | #include "terminal.h" |
efcbbd14 UW |
57 | #include <sys/vfs.h> |
58 | ||
59 | #ifndef SPUFS_MAGIC | |
60 | #define SPUFS_MAGIC 0x23c9b64e | |
61 | #endif | |
dba24537 | 62 | |
10568435 JK |
63 | #ifdef HAVE_PERSONALITY |
64 | # include <sys/personality.h> | |
65 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
66 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
67 | # endif | |
68 | #endif /* HAVE_PERSONALITY */ | |
69 | ||
a96d9b2e SDJ |
70 | /* To be used when one needs to know wether a |
71 | WSTOPSIG (status) is a syscall */ | |
72 | #define TRAP_IS_SYSCALL (SIGTRAP | 0x80) | |
73 | ||
8a77dff3 VP |
74 | /* This comment documents high-level logic of this file. |
75 | ||
76 | Waiting for events in sync mode | |
77 | =============================== | |
78 | ||
79 | When waiting for an event in a specific thread, we just use waitpid, passing | |
80 | the specific pid, and not passing WNOHANG. | |
81 | ||
82 | When waiting for an event in all threads, waitpid is not quite good. Prior to | |
83 | version 2.4, Linux can either wait for event in main thread, or in secondary | |
84 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might | |
85 | miss an event. The solution is to use non-blocking waitpid, together with | |
86 | sigsuspend. First, we use non-blocking waitpid to get an event in the main | |
87 | process, if any. Second, we use non-blocking waitpid with the __WCLONED | |
88 | flag to check for events in cloned processes. If nothing is found, we use | |
89 | sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something | |
90 | happened to a child process -- and SIGCHLD will be delivered both for events | |
91 | in main debugged process and in cloned processes. As soon as we know there's | |
92 | an event, we get back to calling nonblocking waitpid with and without __WCLONED. | |
93 | ||
94 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
95 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's | |
96 | blocked, the signal becomes pending and sigsuspend immediately | |
97 | notices it and returns. | |
98 | ||
99 | Waiting for events in async mode | |
100 | ================================ | |
101 | ||
7feb7d06 PA |
102 | In async mode, GDB should always be ready to handle both user input |
103 | and target events, so neither blocking waitpid nor sigsuspend are | |
104 | viable options. Instead, we should asynchronously notify the GDB main | |
105 | event loop whenever there's an unprocessed event from the target. We | |
106 | detect asynchronous target events by handling SIGCHLD signals. To | |
107 | notify the event loop about target events, the self-pipe trick is used | |
108 | --- a pipe is registered as waitable event source in the event loop, | |
109 | the event loop select/poll's on the read end of this pipe (as well on | |
110 | other event sources, e.g., stdin), and the SIGCHLD handler writes a | |
111 | byte to this pipe. This is more portable than relying on | |
112 | pselect/ppoll, since on kernels that lack those syscalls, libc | |
113 | emulates them with select/poll+sigprocmask, and that is racy | |
114 | (a.k.a. plain broken). | |
115 | ||
116 | Obviously, if we fail to notify the event loop if there's a target | |
117 | event, it's bad. OTOH, if we notify the event loop when there's no | |
118 | event from the target, linux_nat_wait will detect that there's no real | |
119 | event to report, and return event of type TARGET_WAITKIND_IGNORE. | |
120 | This is mostly harmless, but it will waste time and is better avoided. | |
121 | ||
122 | The main design point is that every time GDB is outside linux-nat.c, | |
123 | we have a SIGCHLD handler installed that is called when something | |
124 | happens to the target and notifies the GDB event loop. Whenever GDB | |
125 | core decides to handle the event, and calls into linux-nat.c, we | |
126 | process things as in sync mode, except that the we never block in | |
127 | sigsuspend. | |
128 | ||
129 | While processing an event, we may end up momentarily blocked in | |
130 | waitpid calls. Those waitpid calls, while blocking, are guarantied to | |
131 | return quickly. E.g., in all-stop mode, before reporting to the core | |
132 | that an LWP hit a breakpoint, all LWPs are stopped by sending them | |
133 | SIGSTOP, and synchronously waiting for the SIGSTOP to be reported. | |
134 | Note that this is different from blocking indefinitely waiting for the | |
135 | next event --- here, we're already handling an event. | |
8a77dff3 VP |
136 | |
137 | Use of signals | |
138 | ============== | |
139 | ||
140 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
141 | signal is not entirely significant; we just need for a signal to be delivered, | |
142 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
143 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
144 | be queued once; we do not keep track of other sources of SIGSTOP. | |
145 | ||
146 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
147 | use them, because they have special behavior when the signal is generated - | |
148 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
149 | kills the entire thread group. | |
150 | ||
151 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
152 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
153 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
154 | ||
155 | We could use a real-time signal instead. This would solve those problems; we | |
156 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
157 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
158 | generates it, and there are races with trying to find a signal that is not | |
159 | blocked. */ | |
a0ef4274 | 160 | |
dba24537 AC |
161 | #ifndef O_LARGEFILE |
162 | #define O_LARGEFILE 0 | |
163 | #endif | |
0274a8ce | 164 | |
3993f6b1 DJ |
165 | /* If the system headers did not provide the constants, hard-code the normal |
166 | values. */ | |
167 | #ifndef PTRACE_EVENT_FORK | |
168 | ||
169 | #define PTRACE_SETOPTIONS 0x4200 | |
170 | #define PTRACE_GETEVENTMSG 0x4201 | |
171 | ||
172 | /* options set using PTRACE_SETOPTIONS */ | |
173 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
174 | #define PTRACE_O_TRACEFORK 0x00000002 | |
175 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
176 | #define PTRACE_O_TRACECLONE 0x00000008 | |
177 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
9016a515 DJ |
178 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
179 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
3993f6b1 DJ |
180 | |
181 | /* Wait extended result codes for the above trace options. */ | |
182 | #define PTRACE_EVENT_FORK 1 | |
183 | #define PTRACE_EVENT_VFORK 2 | |
184 | #define PTRACE_EVENT_CLONE 3 | |
185 | #define PTRACE_EVENT_EXEC 4 | |
c874c7fc | 186 | #define PTRACE_EVENT_VFORK_DONE 5 |
9016a515 | 187 | #define PTRACE_EVENT_EXIT 6 |
3993f6b1 DJ |
188 | |
189 | #endif /* PTRACE_EVENT_FORK */ | |
190 | ||
191 | /* We can't always assume that this flag is available, but all systems | |
192 | with the ptrace event handlers also have __WALL, so it's safe to use | |
193 | here. */ | |
194 | #ifndef __WALL | |
195 | #define __WALL 0x40000000 /* Wait for any child. */ | |
196 | #endif | |
197 | ||
02d3ff8c | 198 | #ifndef PTRACE_GETSIGINFO |
1ef18d08 PA |
199 | # define PTRACE_GETSIGINFO 0x4202 |
200 | # define PTRACE_SETSIGINFO 0x4203 | |
02d3ff8c UW |
201 | #endif |
202 | ||
10d6c8cd DJ |
203 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
204 | the use of the multi-threaded target. */ | |
205 | static struct target_ops *linux_ops; | |
f973ed9c | 206 | static struct target_ops linux_ops_saved; |
10d6c8cd | 207 | |
9f0bdab8 DJ |
208 | /* The method to call, if any, when a new thread is attached. */ |
209 | static void (*linux_nat_new_thread) (ptid_t); | |
210 | ||
5b009018 PA |
211 | /* The method to call, if any, when the siginfo object needs to be |
212 | converted between the layout returned by ptrace, and the layout in | |
213 | the architecture of the inferior. */ | |
214 | static int (*linux_nat_siginfo_fixup) (struct siginfo *, | |
215 | gdb_byte *, | |
216 | int); | |
217 | ||
ac264b3b MS |
218 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
219 | Called by our to_xfer_partial. */ | |
220 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
221 | enum target_object, | |
222 | const char *, gdb_byte *, | |
223 | const gdb_byte *, | |
10d6c8cd DJ |
224 | ULONGEST, LONGEST); |
225 | ||
d6b0e80f | 226 | static int debug_linux_nat; |
920d2a44 AC |
227 | static void |
228 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
229 | struct cmd_list_element *c, const char *value) | |
230 | { | |
231 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
232 | value); | |
233 | } | |
d6b0e80f | 234 | |
b84876c2 PA |
235 | static int debug_linux_nat_async = 0; |
236 | static void | |
237 | show_debug_linux_nat_async (struct ui_file *file, int from_tty, | |
238 | struct cmd_list_element *c, const char *value) | |
239 | { | |
240 | fprintf_filtered (file, _("Debugging of GNU/Linux async lwp module is %s.\n"), | |
241 | value); | |
242 | } | |
243 | ||
10568435 JK |
244 | static int disable_randomization = 1; |
245 | ||
246 | static void | |
247 | show_disable_randomization (struct ui_file *file, int from_tty, | |
248 | struct cmd_list_element *c, const char *value) | |
249 | { | |
250 | #ifdef HAVE_PERSONALITY | |
251 | fprintf_filtered (file, _("\ | |
252 | Disabling randomization of debuggee's virtual address space is %s.\n"), | |
253 | value); | |
254 | #else /* !HAVE_PERSONALITY */ | |
255 | fputs_filtered (_("\ | |
256 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
257 | this platform.\n"), file); | |
258 | #endif /* !HAVE_PERSONALITY */ | |
259 | } | |
260 | ||
261 | static void | |
262 | set_disable_randomization (char *args, int from_tty, struct cmd_list_element *c) | |
263 | { | |
264 | #ifndef HAVE_PERSONALITY | |
265 | error (_("\ | |
266 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
267 | this platform.")); | |
268 | #endif /* !HAVE_PERSONALITY */ | |
269 | } | |
270 | ||
9016a515 DJ |
271 | static int linux_parent_pid; |
272 | ||
ae087d01 DJ |
273 | struct simple_pid_list |
274 | { | |
275 | int pid; | |
3d799a95 | 276 | int status; |
ae087d01 DJ |
277 | struct simple_pid_list *next; |
278 | }; | |
279 | struct simple_pid_list *stopped_pids; | |
280 | ||
3993f6b1 DJ |
281 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
282 | can not be used, 1 if it can. */ | |
283 | ||
284 | static int linux_supports_tracefork_flag = -1; | |
285 | ||
a96d9b2e SDJ |
286 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACESYSGOOD |
287 | can not be used, 1 if it can. */ | |
288 | ||
289 | static int linux_supports_tracesysgood_flag = -1; | |
290 | ||
9016a515 DJ |
291 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
292 | PTRACE_O_TRACEVFORKDONE. */ | |
293 | ||
294 | static int linux_supports_tracevforkdone_flag = -1; | |
295 | ||
b84876c2 PA |
296 | /* Async mode support */ |
297 | ||
b84876c2 PA |
298 | /* Zero if the async mode, although enabled, is masked, which means |
299 | linux_nat_wait should behave as if async mode was off. */ | |
300 | static int linux_nat_async_mask_value = 1; | |
301 | ||
a96d9b2e SDJ |
302 | /* Stores the current used ptrace() options. */ |
303 | static int current_ptrace_options = 0; | |
304 | ||
b84876c2 PA |
305 | /* The read/write ends of the pipe registered as waitable file in the |
306 | event loop. */ | |
307 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
308 | ||
7feb7d06 | 309 | /* Flush the event pipe. */ |
b84876c2 | 310 | |
7feb7d06 PA |
311 | static void |
312 | async_file_flush (void) | |
b84876c2 | 313 | { |
7feb7d06 PA |
314 | int ret; |
315 | char buf; | |
b84876c2 | 316 | |
7feb7d06 | 317 | do |
b84876c2 | 318 | { |
7feb7d06 | 319 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 320 | } |
7feb7d06 | 321 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
322 | } |
323 | ||
7feb7d06 PA |
324 | /* Put something (anything, doesn't matter what, or how much) in event |
325 | pipe, so that the select/poll in the event-loop realizes we have | |
326 | something to process. */ | |
252fbfc8 | 327 | |
b84876c2 | 328 | static void |
7feb7d06 | 329 | async_file_mark (void) |
b84876c2 | 330 | { |
7feb7d06 | 331 | int ret; |
b84876c2 | 332 | |
7feb7d06 PA |
333 | /* It doesn't really matter what the pipe contains, as long we end |
334 | up with something in it. Might as well flush the previous | |
335 | left-overs. */ | |
336 | async_file_flush (); | |
b84876c2 | 337 | |
7feb7d06 | 338 | do |
b84876c2 | 339 | { |
7feb7d06 | 340 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 341 | } |
7feb7d06 | 342 | while (ret == -1 && errno == EINTR); |
b84876c2 | 343 | |
7feb7d06 PA |
344 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
345 | be awakened anyway. */ | |
b84876c2 PA |
346 | } |
347 | ||
7feb7d06 PA |
348 | static void linux_nat_async (void (*callback) |
349 | (enum inferior_event_type event_type, void *context), | |
350 | void *context); | |
351 | static int linux_nat_async_mask (int mask); | |
352 | static int kill_lwp (int lwpid, int signo); | |
353 | ||
354 | static int stop_callback (struct lwp_info *lp, void *data); | |
355 | ||
356 | static void block_child_signals (sigset_t *prev_mask); | |
357 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
2277426b PA |
358 | |
359 | struct lwp_info; | |
360 | static struct lwp_info *add_lwp (ptid_t ptid); | |
361 | static void purge_lwp_list (int pid); | |
362 | static struct lwp_info *find_lwp_pid (ptid_t ptid); | |
363 | ||
ae087d01 DJ |
364 | \f |
365 | /* Trivial list manipulation functions to keep track of a list of | |
366 | new stopped processes. */ | |
367 | static void | |
3d799a95 | 368 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
369 | { |
370 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
371 | new_pid->pid = pid; | |
3d799a95 | 372 | new_pid->status = status; |
ae087d01 DJ |
373 | new_pid->next = *listp; |
374 | *listp = new_pid; | |
375 | } | |
376 | ||
377 | static int | |
3d799a95 | 378 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *status) |
ae087d01 DJ |
379 | { |
380 | struct simple_pid_list **p; | |
381 | ||
382 | for (p = listp; *p != NULL; p = &(*p)->next) | |
383 | if ((*p)->pid == pid) | |
384 | { | |
385 | struct simple_pid_list *next = (*p)->next; | |
3d799a95 | 386 | *status = (*p)->status; |
ae087d01 DJ |
387 | xfree (*p); |
388 | *p = next; | |
389 | return 1; | |
390 | } | |
391 | return 0; | |
392 | } | |
393 | ||
3d799a95 DJ |
394 | static void |
395 | linux_record_stopped_pid (int pid, int status) | |
ae087d01 | 396 | { |
3d799a95 | 397 | add_to_pid_list (&stopped_pids, pid, status); |
ae087d01 DJ |
398 | } |
399 | ||
3993f6b1 DJ |
400 | \f |
401 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
402 | ||
403 | static void | |
404 | linux_tracefork_child (void) | |
405 | { | |
406 | int ret; | |
407 | ||
408 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
409 | kill (getpid (), SIGSTOP); | |
410 | fork (); | |
48bb3cce | 411 | _exit (0); |
3993f6b1 DJ |
412 | } |
413 | ||
7feb7d06 | 414 | /* Wrapper function for waitpid which handles EINTR. */ |
b957e937 DJ |
415 | |
416 | static int | |
417 | my_waitpid (int pid, int *status, int flags) | |
418 | { | |
419 | int ret; | |
b84876c2 | 420 | |
b957e937 DJ |
421 | do |
422 | { | |
423 | ret = waitpid (pid, status, flags); | |
424 | } | |
425 | while (ret == -1 && errno == EINTR); | |
426 | ||
427 | return ret; | |
428 | } | |
429 | ||
430 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
431 | ||
432 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
433 | we know that the feature is not available. This may change the tracing | |
434 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
435 | ||
436 | However, if it succeeds, we don't know for sure that the feature is | |
437 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 438 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
439 | fork tracing, and let it fork. If the process exits, we assume that we |
440 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
441 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
442 | |
443 | static void | |
b957e937 | 444 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
445 | { |
446 | int child_pid, ret, status; | |
447 | long second_pid; | |
7feb7d06 | 448 | sigset_t prev_mask; |
4c28f408 | 449 | |
7feb7d06 PA |
450 | /* We don't want those ptrace calls to be interrupted. */ |
451 | block_child_signals (&prev_mask); | |
3993f6b1 | 452 | |
b957e937 DJ |
453 | linux_supports_tracefork_flag = 0; |
454 | linux_supports_tracevforkdone_flag = 0; | |
455 | ||
456 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
457 | if (ret != 0) | |
7feb7d06 PA |
458 | { |
459 | restore_child_signals_mask (&prev_mask); | |
460 | return; | |
461 | } | |
b957e937 | 462 | |
3993f6b1 DJ |
463 | child_pid = fork (); |
464 | if (child_pid == -1) | |
e2e0b3e5 | 465 | perror_with_name (("fork")); |
3993f6b1 DJ |
466 | |
467 | if (child_pid == 0) | |
468 | linux_tracefork_child (); | |
469 | ||
b957e937 | 470 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 471 | if (ret == -1) |
e2e0b3e5 | 472 | perror_with_name (("waitpid")); |
3993f6b1 | 473 | else if (ret != child_pid) |
8a3fe4f8 | 474 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 475 | if (! WIFSTOPPED (status)) |
8a3fe4f8 | 476 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status); |
3993f6b1 | 477 | |
3993f6b1 DJ |
478 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
479 | if (ret != 0) | |
480 | { | |
b957e937 DJ |
481 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
482 | if (ret != 0) | |
483 | { | |
8a3fe4f8 | 484 | warning (_("linux_test_for_tracefork: failed to kill child")); |
7feb7d06 | 485 | restore_child_signals_mask (&prev_mask); |
b957e937 DJ |
486 | return; |
487 | } | |
488 | ||
489 | ret = my_waitpid (child_pid, &status, 0); | |
490 | if (ret != child_pid) | |
8a3fe4f8 | 491 | warning (_("linux_test_for_tracefork: failed to wait for killed child")); |
b957e937 | 492 | else if (!WIFSIGNALED (status)) |
8a3fe4f8 AC |
493 | warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from " |
494 | "killed child"), status); | |
b957e937 | 495 | |
7feb7d06 | 496 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
497 | return; |
498 | } | |
499 | ||
9016a515 DJ |
500 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
501 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
502 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
503 | linux_supports_tracevforkdone_flag = (ret == 0); | |
504 | ||
b957e937 DJ |
505 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
506 | if (ret != 0) | |
8a3fe4f8 | 507 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
508 | |
509 | ret = my_waitpid (child_pid, &status, 0); | |
510 | ||
3993f6b1 DJ |
511 | if (ret == child_pid && WIFSTOPPED (status) |
512 | && status >> 16 == PTRACE_EVENT_FORK) | |
513 | { | |
514 | second_pid = 0; | |
515 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
516 | if (ret == 0 && second_pid != 0) | |
517 | { | |
518 | int second_status; | |
519 | ||
520 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
521 | my_waitpid (second_pid, &second_status, 0); |
522 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
523 | if (ret != 0) | |
8a3fe4f8 | 524 | warning (_("linux_test_for_tracefork: failed to kill second child")); |
97725dc4 | 525 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
526 | } |
527 | } | |
b957e937 | 528 | else |
8a3fe4f8 AC |
529 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
530 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 531 | |
b957e937 DJ |
532 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
533 | if (ret != 0) | |
8a3fe4f8 | 534 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 535 | my_waitpid (child_pid, &status, 0); |
4c28f408 | 536 | |
7feb7d06 | 537 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
538 | } |
539 | ||
a96d9b2e SDJ |
540 | /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls. |
541 | ||
542 | We try to enable syscall tracing on ORIGINAL_PID. If this fails, | |
543 | we know that the feature is not available. This may change the tracing | |
544 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. */ | |
545 | ||
546 | static void | |
547 | linux_test_for_tracesysgood (int original_pid) | |
548 | { | |
549 | int ret; | |
550 | sigset_t prev_mask; | |
551 | ||
552 | /* We don't want those ptrace calls to be interrupted. */ | |
553 | block_child_signals (&prev_mask); | |
554 | ||
555 | linux_supports_tracesysgood_flag = 0; | |
556 | ||
557 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACESYSGOOD); | |
558 | if (ret != 0) | |
559 | goto out; | |
560 | ||
561 | linux_supports_tracesysgood_flag = 1; | |
562 | out: | |
563 | restore_child_signals_mask (&prev_mask); | |
564 | } | |
565 | ||
566 | /* Determine wether we support PTRACE_O_TRACESYSGOOD option available. | |
567 | This function also sets linux_supports_tracesysgood_flag. */ | |
568 | ||
569 | static int | |
570 | linux_supports_tracesysgood (int pid) | |
571 | { | |
572 | if (linux_supports_tracesysgood_flag == -1) | |
573 | linux_test_for_tracesysgood (pid); | |
574 | return linux_supports_tracesysgood_flag; | |
575 | } | |
576 | ||
3993f6b1 DJ |
577 | /* Return non-zero iff we have tracefork functionality available. |
578 | This function also sets linux_supports_tracefork_flag. */ | |
579 | ||
580 | static int | |
b957e937 | 581 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
582 | { |
583 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 584 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
585 | return linux_supports_tracefork_flag; |
586 | } | |
587 | ||
9016a515 | 588 | static int |
b957e937 | 589 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
590 | { |
591 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 592 | linux_test_for_tracefork (pid); |
9016a515 DJ |
593 | return linux_supports_tracevforkdone_flag; |
594 | } | |
595 | ||
a96d9b2e SDJ |
596 | static void |
597 | linux_enable_tracesysgood (ptid_t ptid) | |
598 | { | |
599 | int pid = ptid_get_lwp (ptid); | |
600 | ||
601 | if (pid == 0) | |
602 | pid = ptid_get_pid (ptid); | |
603 | ||
604 | if (linux_supports_tracesysgood (pid) == 0) | |
605 | return; | |
606 | ||
607 | current_ptrace_options |= PTRACE_O_TRACESYSGOOD; | |
608 | ||
609 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); | |
610 | } | |
611 | ||
3993f6b1 | 612 | \f |
4de4c07c DJ |
613 | void |
614 | linux_enable_event_reporting (ptid_t ptid) | |
615 | { | |
d3587048 | 616 | int pid = ptid_get_lwp (ptid); |
4de4c07c | 617 | |
d3587048 DJ |
618 | if (pid == 0) |
619 | pid = ptid_get_pid (ptid); | |
620 | ||
b957e937 | 621 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
622 | return; |
623 | ||
a96d9b2e SDJ |
624 | current_ptrace_options |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK |
625 | | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE; | |
626 | ||
b957e937 | 627 | if (linux_supports_tracevforkdone (pid)) |
a96d9b2e | 628 | current_ptrace_options |= PTRACE_O_TRACEVFORKDONE; |
9016a515 DJ |
629 | |
630 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
631 | read-only process state. */ | |
4de4c07c | 632 | |
a96d9b2e | 633 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); |
4de4c07c DJ |
634 | } |
635 | ||
6d8fd2b7 UW |
636 | static void |
637 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
638 | { |
639 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
0ec9a092 | 640 | check_for_thread_db (); |
a96d9b2e | 641 | linux_enable_tracesysgood (pid_to_ptid (pid)); |
4de4c07c DJ |
642 | } |
643 | ||
10d6c8cd | 644 | static void |
4de4c07c DJ |
645 | linux_child_post_startup_inferior (ptid_t ptid) |
646 | { | |
647 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 648 | check_for_thread_db (); |
a96d9b2e | 649 | linux_enable_tracesysgood (ptid); |
4de4c07c DJ |
650 | } |
651 | ||
6d8fd2b7 UW |
652 | static int |
653 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 654 | { |
7feb7d06 | 655 | sigset_t prev_mask; |
9016a515 | 656 | int has_vforked; |
4de4c07c DJ |
657 | int parent_pid, child_pid; |
658 | ||
7feb7d06 | 659 | block_child_signals (&prev_mask); |
b84876c2 | 660 | |
e58b0e63 PA |
661 | has_vforked = (inferior_thread ()->pending_follow.kind |
662 | == TARGET_WAITKIND_VFORKED); | |
663 | parent_pid = ptid_get_lwp (inferior_ptid); | |
d3587048 | 664 | if (parent_pid == 0) |
e58b0e63 PA |
665 | parent_pid = ptid_get_pid (inferior_ptid); |
666 | child_pid = PIDGET (inferior_thread ()->pending_follow.value.related_pid); | |
4de4c07c | 667 | |
2277426b PA |
668 | if (!detach_fork) |
669 | linux_enable_event_reporting (pid_to_ptid (child_pid)); | |
670 | ||
4de4c07c DJ |
671 | if (! follow_child) |
672 | { | |
673 | /* We're already attached to the parent, by default. */ | |
674 | ||
675 | /* Before detaching from the child, remove all breakpoints from | |
b242c3c2 PA |
676 | it. If we forked, then this has already been taken care of |
677 | by infrun.c. If we vforked however, any breakpoint inserted | |
678 | in the parent is visible in the child, even those added while | |
679 | stopped in a vfork catchpoint. This won't actually modify | |
680 | the breakpoint list, but will physically remove the | |
681 | breakpoints from the child. This will remove the breakpoints | |
682 | from the parent also, but they'll be reinserted below. */ | |
683 | if (has_vforked) | |
684 | detach_breakpoints (child_pid); | |
4de4c07c | 685 | |
ac264b3b MS |
686 | /* Detach new forked process? */ |
687 | if (detach_fork) | |
f75c00e4 | 688 | { |
e85a822c | 689 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
690 | { |
691 | target_terminal_ours (); | |
692 | fprintf_filtered (gdb_stdlog, | |
693 | "Detaching after fork from child process %d.\n", | |
694 | child_pid); | |
695 | } | |
4de4c07c | 696 | |
ac264b3b MS |
697 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
698 | } | |
699 | else | |
700 | { | |
77435e4c | 701 | struct inferior *parent_inf, *child_inf; |
2277426b PA |
702 | struct lwp_info *lp; |
703 | struct cleanup *old_chain; | |
7f9f62ba PA |
704 | |
705 | /* Add process to GDB's tables. */ | |
77435e4c PA |
706 | child_inf = add_inferior (child_pid); |
707 | ||
e58b0e63 | 708 | parent_inf = current_inferior (); |
77435e4c | 709 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 710 | copy_terminal_info (child_inf, parent_inf); |
7f9f62ba | 711 | |
2277426b PA |
712 | old_chain = save_inferior_ptid (); |
713 | ||
714 | inferior_ptid = ptid_build (child_pid, child_pid, 0); | |
715 | add_thread (inferior_ptid); | |
716 | lp = add_lwp (inferior_ptid); | |
717 | lp->stopped = 1; | |
718 | ||
719 | check_for_thread_db (); | |
720 | ||
721 | do_cleanups (old_chain); | |
ac264b3b | 722 | } |
9016a515 DJ |
723 | |
724 | if (has_vforked) | |
725 | { | |
b957e937 DJ |
726 | gdb_assert (linux_supports_tracefork_flag >= 0); |
727 | if (linux_supports_tracevforkdone (0)) | |
9016a515 DJ |
728 | { |
729 | int status; | |
730 | ||
731 | ptrace (PTRACE_CONT, parent_pid, 0, 0); | |
58aecb61 | 732 | my_waitpid (parent_pid, &status, __WALL); |
c874c7fc | 733 | if ((status >> 16) != PTRACE_EVENT_VFORK_DONE) |
8a3fe4f8 AC |
734 | warning (_("Unexpected waitpid result %06x when waiting for " |
735 | "vfork-done"), status); | |
9016a515 DJ |
736 | } |
737 | else | |
738 | { | |
739 | /* We can't insert breakpoints until the child has | |
740 | finished with the shared memory region. We need to | |
741 | wait until that happens. Ideal would be to just | |
742 | call: | |
743 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
744 | - waitpid (parent_pid, &status, __WALL); | |
745 | However, most architectures can't handle a syscall | |
746 | being traced on the way out if it wasn't traced on | |
747 | the way in. | |
748 | ||
749 | We might also think to loop, continuing the child | |
750 | until it exits or gets a SIGTRAP. One problem is | |
751 | that the child might call ptrace with PTRACE_TRACEME. | |
752 | ||
753 | There's no simple and reliable way to figure out when | |
754 | the vforked child will be done with its copy of the | |
755 | shared memory. We could step it out of the syscall, | |
756 | two instructions, let it go, and then single-step the | |
757 | parent once. When we have hardware single-step, this | |
758 | would work; with software single-step it could still | |
759 | be made to work but we'd have to be able to insert | |
760 | single-step breakpoints in the child, and we'd have | |
761 | to insert -just- the single-step breakpoint in the | |
762 | parent. Very awkward. | |
763 | ||
764 | In the end, the best we can do is to make sure it | |
765 | runs for a little while. Hopefully it will be out of | |
766 | range of any breakpoints we reinsert. Usually this | |
767 | is only the single-step breakpoint at vfork's return | |
768 | point. */ | |
769 | ||
770 | usleep (10000); | |
771 | } | |
772 | ||
773 | /* Since we vforked, breakpoints were removed in the parent | |
774 | too. Put them back. */ | |
775 | reattach_breakpoints (parent_pid); | |
776 | } | |
4de4c07c | 777 | } |
3993f6b1 | 778 | else |
4de4c07c | 779 | { |
4e1c45ea | 780 | struct thread_info *tp; |
77435e4c | 781 | struct inferior *parent_inf, *child_inf; |
2277426b | 782 | struct lwp_info *lp; |
4de4c07c | 783 | |
4de4c07c DJ |
784 | /* Before detaching from the parent, remove all breakpoints from it. */ |
785 | remove_breakpoints (); | |
786 | ||
e85a822c | 787 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
788 | { |
789 | target_terminal_ours (); | |
ac264b3b MS |
790 | fprintf_filtered (gdb_stdlog, |
791 | "Attaching after fork to child process %d.\n", | |
792 | child_pid); | |
f75c00e4 | 793 | } |
4de4c07c | 794 | |
7a7d3353 PA |
795 | /* Add the new inferior first, so that the target_detach below |
796 | doesn't unpush the target. */ | |
797 | ||
77435e4c PA |
798 | child_inf = add_inferior (child_pid); |
799 | ||
e58b0e63 | 800 | parent_inf = current_inferior (); |
77435e4c | 801 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 802 | copy_terminal_info (child_inf, parent_inf); |
7a7d3353 | 803 | |
9016a515 DJ |
804 | /* If we're vforking, we may want to hold on to the parent until |
805 | the child exits or execs. At exec time we can remove the old | |
806 | breakpoints from the parent and detach it; at exit time we | |
807 | could do the same (or even, sneakily, resume debugging it - the | |
808 | child's exec has failed, or something similar). | |
809 | ||
810 | This doesn't clean up "properly", because we can't call | |
811 | target_detach, but that's OK; if the current target is "child", | |
812 | then it doesn't need any further cleanups, and lin_lwp will | |
813 | generally not encounter vfork (vfork is defined to fork | |
814 | in libpthread.so). | |
815 | ||
816 | The holding part is very easy if we have VFORKDONE events; | |
817 | but keeping track of both processes is beyond GDB at the | |
818 | moment. So we don't expose the parent to the rest of GDB. | |
819 | Instead we quietly hold onto it until such time as we can | |
820 | safely resume it. */ | |
821 | ||
822 | if (has_vforked) | |
7f9f62ba | 823 | { |
2277426b PA |
824 | struct lwp_info *parent_lwp; |
825 | ||
7f9f62ba | 826 | linux_parent_pid = parent_pid; |
2277426b PA |
827 | |
828 | /* Get rid of the inferior on the core side as well. */ | |
829 | inferior_ptid = null_ptid; | |
7f9f62ba | 830 | detach_inferior (parent_pid); |
0d14fc63 | 831 | |
2277426b PA |
832 | /* Also get rid of all its lwps. We will detach from this |
833 | inferior soon-ish, but, we will still get an exit event | |
834 | reported through waitpid when it exits. If we didn't get | |
835 | rid of the lwps from our list, we would end up reporting | |
836 | the inferior exit to the core, which would then try to | |
837 | mourn a non-existing (from the core's perspective) | |
838 | inferior. */ | |
839 | parent_lwp = find_lwp_pid (pid_to_ptid (parent_pid)); | |
840 | purge_lwp_list (GET_PID (parent_lwp->ptid)); | |
841 | linux_parent_pid = parent_pid; | |
ac264b3b | 842 | } |
2277426b | 843 | else if (detach_fork) |
b84876c2 | 844 | target_detach (NULL, 0); |
4de4c07c | 845 | |
9f0bdab8 | 846 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
2277426b PA |
847 | add_thread (inferior_ptid); |
848 | lp = add_lwp (inferior_ptid); | |
849 | lp->stopped = 1; | |
ac264b3b | 850 | |
ef29ce1a | 851 | check_for_thread_db (); |
4de4c07c DJ |
852 | } |
853 | ||
7feb7d06 | 854 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
855 | return 0; |
856 | } | |
857 | ||
4de4c07c | 858 | \f |
6d8fd2b7 UW |
859 | static void |
860 | linux_child_insert_fork_catchpoint (int pid) | |
4de4c07c | 861 | { |
b957e937 | 862 | if (! linux_supports_tracefork (pid)) |
8a3fe4f8 | 863 | error (_("Your system does not support fork catchpoints.")); |
3993f6b1 DJ |
864 | } |
865 | ||
6d8fd2b7 UW |
866 | static void |
867 | linux_child_insert_vfork_catchpoint (int pid) | |
3993f6b1 | 868 | { |
b957e937 | 869 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 870 | error (_("Your system does not support vfork catchpoints.")); |
3993f6b1 DJ |
871 | } |
872 | ||
6d8fd2b7 UW |
873 | static void |
874 | linux_child_insert_exec_catchpoint (int pid) | |
3993f6b1 | 875 | { |
b957e937 | 876 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 877 | error (_("Your system does not support exec catchpoints.")); |
3993f6b1 DJ |
878 | } |
879 | ||
a96d9b2e SDJ |
880 | static int |
881 | linux_child_set_syscall_catchpoint (int pid, int needed, int any_count, | |
882 | int table_size, int *table) | |
883 | { | |
884 | if (! linux_supports_tracesysgood (pid)) | |
885 | error (_("Your system does not support syscall catchpoints.")); | |
886 | /* On GNU/Linux, we ignore the arguments. It means that we only | |
887 | enable the syscall catchpoints, but do not disable them. | |
888 | ||
889 | Also, we do not use the `table' information because we do not | |
890 | filter system calls here. We let GDB do the logic for us. */ | |
891 | return 0; | |
892 | } | |
893 | ||
d6b0e80f AC |
894 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
895 | are processes sharing the same VM space. A multi-threaded process | |
896 | is basically a group of such processes. However, such a grouping | |
897 | is almost entirely a user-space issue; the kernel doesn't enforce | |
898 | such a grouping at all (this might change in the future). In | |
899 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
900 | Threads library) to provide such a grouping. | |
901 | ||
902 | It is perfectly well possible to write a multi-threaded application | |
903 | without the assistance of a threads library, by using the clone | |
904 | system call directly. This module should be able to give some | |
905 | rudimentary support for debugging such applications if developers | |
906 | specify the CLONE_PTRACE flag in the clone system call, and are | |
907 | using the Linux kernel 2.4 or above. | |
908 | ||
909 | Note that there are some peculiarities in GNU/Linux that affect | |
910 | this code: | |
911 | ||
912 | - In general one should specify the __WCLONE flag to waitpid in | |
913 | order to make it report events for any of the cloned processes | |
914 | (and leave it out for the initial process). However, if a cloned | |
915 | process has exited the exit status is only reported if the | |
916 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
917 | we cannot use it since GDB must work on older systems too. | |
918 | ||
919 | - When a traced, cloned process exits and is waited for by the | |
920 | debugger, the kernel reassigns it to the original parent and | |
921 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
922 | library doesn't notice this, which leads to the "zombie problem": | |
923 | When debugged a multi-threaded process that spawns a lot of | |
924 | threads will run out of processes, even if the threads exit, | |
925 | because the "zombies" stay around. */ | |
926 | ||
927 | /* List of known LWPs. */ | |
9f0bdab8 | 928 | struct lwp_info *lwp_list; |
d6b0e80f AC |
929 | \f |
930 | ||
d6b0e80f AC |
931 | /* Original signal mask. */ |
932 | static sigset_t normal_mask; | |
933 | ||
934 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
935 | _initialize_linux_nat. */ | |
936 | static sigset_t suspend_mask; | |
937 | ||
7feb7d06 PA |
938 | /* Signals to block to make that sigsuspend work. */ |
939 | static sigset_t blocked_mask; | |
940 | ||
941 | /* SIGCHLD action. */ | |
942 | struct sigaction sigchld_action; | |
b84876c2 | 943 | |
7feb7d06 PA |
944 | /* Block child signals (SIGCHLD and linux threads signals), and store |
945 | the previous mask in PREV_MASK. */ | |
84e46146 | 946 | |
7feb7d06 PA |
947 | static void |
948 | block_child_signals (sigset_t *prev_mask) | |
949 | { | |
950 | /* Make sure SIGCHLD is blocked. */ | |
951 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
952 | sigaddset (&blocked_mask, SIGCHLD); | |
953 | ||
954 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
955 | } | |
956 | ||
957 | /* Restore child signals mask, previously returned by | |
958 | block_child_signals. */ | |
959 | ||
960 | static void | |
961 | restore_child_signals_mask (sigset_t *prev_mask) | |
962 | { | |
963 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
964 | } | |
d6b0e80f AC |
965 | \f |
966 | ||
967 | /* Prototypes for local functions. */ | |
968 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 969 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 970 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd PA |
971 | static int cancel_breakpoint (struct lwp_info *lp); |
972 | ||
d6b0e80f AC |
973 | \f |
974 | /* Convert wait status STATUS to a string. Used for printing debug | |
975 | messages only. */ | |
976 | ||
977 | static char * | |
978 | status_to_str (int status) | |
979 | { | |
980 | static char buf[64]; | |
981 | ||
982 | if (WIFSTOPPED (status)) | |
983 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
984 | strsignal (WSTOPSIG (status))); | |
985 | else if (WIFSIGNALED (status)) | |
986 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
987 | strsignal (WSTOPSIG (status))); | |
988 | else | |
989 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
990 | ||
991 | return buf; | |
992 | } | |
993 | ||
994 | /* Initialize the list of LWPs. Note that this module, contrary to | |
995 | what GDB's generic threads layer does for its thread list, | |
996 | re-initializes the LWP lists whenever we mourn or detach (which | |
997 | doesn't involve mourning) the inferior. */ | |
998 | ||
999 | static void | |
1000 | init_lwp_list (void) | |
1001 | { | |
1002 | struct lwp_info *lp, *lpnext; | |
1003 | ||
1004 | for (lp = lwp_list; lp; lp = lpnext) | |
1005 | { | |
1006 | lpnext = lp->next; | |
1007 | xfree (lp); | |
1008 | } | |
1009 | ||
1010 | lwp_list = NULL; | |
d90e17a7 PA |
1011 | } |
1012 | ||
1013 | /* Remove all LWPs belong to PID from the lwp list. */ | |
1014 | ||
1015 | static void | |
1016 | purge_lwp_list (int pid) | |
1017 | { | |
1018 | struct lwp_info *lp, *lpprev, *lpnext; | |
1019 | ||
1020 | lpprev = NULL; | |
1021 | ||
1022 | for (lp = lwp_list; lp; lp = lpnext) | |
1023 | { | |
1024 | lpnext = lp->next; | |
1025 | ||
1026 | if (ptid_get_pid (lp->ptid) == pid) | |
1027 | { | |
1028 | if (lp == lwp_list) | |
1029 | lwp_list = lp->next; | |
1030 | else | |
1031 | lpprev->next = lp->next; | |
1032 | ||
1033 | xfree (lp); | |
1034 | } | |
1035 | else | |
1036 | lpprev = lp; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | /* Return the number of known LWPs in the tgid given by PID. */ | |
1041 | ||
1042 | static int | |
1043 | num_lwps (int pid) | |
1044 | { | |
1045 | int count = 0; | |
1046 | struct lwp_info *lp; | |
1047 | ||
1048 | for (lp = lwp_list; lp; lp = lp->next) | |
1049 | if (ptid_get_pid (lp->ptid) == pid) | |
1050 | count++; | |
1051 | ||
1052 | return count; | |
d6b0e80f AC |
1053 | } |
1054 | ||
f973ed9c | 1055 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1056 | structure describing the new LWP. The LWP should already be stopped |
1057 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1058 | |
1059 | static struct lwp_info * | |
1060 | add_lwp (ptid_t ptid) | |
1061 | { | |
1062 | struct lwp_info *lp; | |
1063 | ||
1064 | gdb_assert (is_lwp (ptid)); | |
1065 | ||
1066 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1067 | ||
1068 | memset (lp, 0, sizeof (struct lwp_info)); | |
1069 | ||
1070 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1071 | ||
1072 | lp->ptid = ptid; | |
1073 | ||
1074 | lp->next = lwp_list; | |
1075 | lwp_list = lp; | |
d6b0e80f | 1076 | |
d90e17a7 | 1077 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1078 | linux_nat_new_thread (ptid); |
1079 | ||
d6b0e80f AC |
1080 | return lp; |
1081 | } | |
1082 | ||
1083 | /* Remove the LWP specified by PID from the list. */ | |
1084 | ||
1085 | static void | |
1086 | delete_lwp (ptid_t ptid) | |
1087 | { | |
1088 | struct lwp_info *lp, *lpprev; | |
1089 | ||
1090 | lpprev = NULL; | |
1091 | ||
1092 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1093 | if (ptid_equal (lp->ptid, ptid)) | |
1094 | break; | |
1095 | ||
1096 | if (!lp) | |
1097 | return; | |
1098 | ||
d6b0e80f AC |
1099 | if (lpprev) |
1100 | lpprev->next = lp->next; | |
1101 | else | |
1102 | lwp_list = lp->next; | |
1103 | ||
1104 | xfree (lp); | |
1105 | } | |
1106 | ||
1107 | /* Return a pointer to the structure describing the LWP corresponding | |
1108 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1109 | ||
1110 | static struct lwp_info * | |
1111 | find_lwp_pid (ptid_t ptid) | |
1112 | { | |
1113 | struct lwp_info *lp; | |
1114 | int lwp; | |
1115 | ||
1116 | if (is_lwp (ptid)) | |
1117 | lwp = GET_LWP (ptid); | |
1118 | else | |
1119 | lwp = GET_PID (ptid); | |
1120 | ||
1121 | for (lp = lwp_list; lp; lp = lp->next) | |
1122 | if (lwp == GET_LWP (lp->ptid)) | |
1123 | return lp; | |
1124 | ||
1125 | return NULL; | |
1126 | } | |
1127 | ||
d90e17a7 PA |
1128 | /* Returns true if PTID matches filter FILTER. FILTER can be the wild |
1129 | card MINUS_ONE_PTID (all ptid match it); can be a ptid representing | |
1130 | a process (ptid_is_pid returns true), in which case, all lwps of | |
1131 | that give process match, lwps of other process do not; or, it can | |
1132 | represent a specific thread, in which case, only that thread will | |
1133 | match true. PTID must represent an LWP, it can never be a wild | |
1134 | card. */ | |
1135 | ||
1136 | static int | |
1137 | ptid_match (ptid_t ptid, ptid_t filter) | |
1138 | { | |
1139 | /* Since both parameters have the same type, prevent easy mistakes | |
1140 | from happening. */ | |
1141 | gdb_assert (!ptid_equal (ptid, minus_one_ptid) | |
1142 | && !ptid_equal (ptid, null_ptid)); | |
1143 | ||
1144 | if (ptid_equal (filter, minus_one_ptid)) | |
1145 | return 1; | |
1146 | if (ptid_is_pid (filter) | |
1147 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
1148 | return 1; | |
1149 | else if (ptid_equal (ptid, filter)) | |
1150 | return 1; | |
1151 | ||
1152 | return 0; | |
1153 | } | |
1154 | ||
d6b0e80f AC |
1155 | /* Call CALLBACK with its second argument set to DATA for every LWP in |
1156 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1157 | pointer to the structure describing that LWP immediately. | |
1158 | Otherwise return NULL. */ | |
1159 | ||
1160 | struct lwp_info * | |
d90e17a7 PA |
1161 | iterate_over_lwps (ptid_t filter, |
1162 | int (*callback) (struct lwp_info *, void *), | |
1163 | void *data) | |
d6b0e80f AC |
1164 | { |
1165 | struct lwp_info *lp, *lpnext; | |
1166 | ||
1167 | for (lp = lwp_list; lp; lp = lpnext) | |
1168 | { | |
1169 | lpnext = lp->next; | |
d90e17a7 PA |
1170 | |
1171 | if (ptid_match (lp->ptid, filter)) | |
1172 | { | |
1173 | if ((*callback) (lp, data)) | |
1174 | return lp; | |
1175 | } | |
d6b0e80f AC |
1176 | } |
1177 | ||
1178 | return NULL; | |
1179 | } | |
1180 | ||
2277426b PA |
1181 | /* Update our internal state when changing from one checkpoint to |
1182 | another indicated by NEW_PTID. We can only switch single-threaded | |
1183 | applications, so we only create one new LWP, and the previous list | |
1184 | is discarded. */ | |
f973ed9c DJ |
1185 | |
1186 | void | |
1187 | linux_nat_switch_fork (ptid_t new_ptid) | |
1188 | { | |
1189 | struct lwp_info *lp; | |
1190 | ||
2277426b PA |
1191 | purge_lwp_list (GET_PID (inferior_ptid)); |
1192 | ||
f973ed9c DJ |
1193 | lp = add_lwp (new_ptid); |
1194 | lp->stopped = 1; | |
e26af52f | 1195 | |
2277426b PA |
1196 | /* This changes the thread's ptid while preserving the gdb thread |
1197 | num. Also changes the inferior pid, while preserving the | |
1198 | inferior num. */ | |
1199 | thread_change_ptid (inferior_ptid, new_ptid); | |
1200 | ||
1201 | /* We've just told GDB core that the thread changed target id, but, | |
1202 | in fact, it really is a different thread, with different register | |
1203 | contents. */ | |
1204 | registers_changed (); | |
e26af52f DJ |
1205 | } |
1206 | ||
e26af52f DJ |
1207 | /* Handle the exit of a single thread LP. */ |
1208 | ||
1209 | static void | |
1210 | exit_lwp (struct lwp_info *lp) | |
1211 | { | |
e09875d4 | 1212 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1213 | |
1214 | if (th) | |
e26af52f | 1215 | { |
17faa917 DJ |
1216 | if (print_thread_events) |
1217 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1218 | ||
4f8d22e3 | 1219 | delete_thread (lp->ptid); |
e26af52f DJ |
1220 | } |
1221 | ||
1222 | delete_lwp (lp->ptid); | |
1223 | } | |
1224 | ||
4d062f1a PA |
1225 | /* Return an lwp's tgid, found in `/proc/PID/status'. */ |
1226 | ||
1227 | int | |
1228 | linux_proc_get_tgid (int lwpid) | |
1229 | { | |
1230 | FILE *status_file; | |
1231 | char buf[100]; | |
1232 | int tgid = -1; | |
1233 | ||
1234 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); | |
1235 | status_file = fopen (buf, "r"); | |
1236 | if (status_file != NULL) | |
1237 | { | |
1238 | while (fgets (buf, sizeof (buf), status_file)) | |
1239 | { | |
1240 | if (strncmp (buf, "Tgid:", 5) == 0) | |
1241 | { | |
1242 | tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10); | |
1243 | break; | |
1244 | } | |
1245 | } | |
1246 | ||
1247 | fclose (status_file); | |
1248 | } | |
1249 | ||
1250 | return tgid; | |
1251 | } | |
1252 | ||
a0ef4274 DJ |
1253 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1254 | Other states including `T (tracing stop)' are reported as false. */ | |
1255 | ||
1256 | static int | |
1257 | pid_is_stopped (pid_t pid) | |
1258 | { | |
1259 | FILE *status_file; | |
1260 | char buf[100]; | |
1261 | int retval = 0; | |
1262 | ||
1263 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1264 | status_file = fopen (buf, "r"); | |
1265 | if (status_file != NULL) | |
1266 | { | |
1267 | int have_state = 0; | |
1268 | ||
1269 | while (fgets (buf, sizeof (buf), status_file)) | |
1270 | { | |
1271 | if (strncmp (buf, "State:", 6) == 0) | |
1272 | { | |
1273 | have_state = 1; | |
1274 | break; | |
1275 | } | |
1276 | } | |
1277 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1278 | retval = 1; | |
1279 | fclose (status_file); | |
1280 | } | |
1281 | return retval; | |
1282 | } | |
1283 | ||
1284 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1285 | Returns a wait status for that LWP, to cache. */ | |
1286 | ||
1287 | static int | |
1288 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1289 | int *signalled) | |
1290 | { | |
1291 | pid_t new_pid, pid = GET_LWP (ptid); | |
1292 | int status; | |
1293 | ||
1294 | if (pid_is_stopped (pid)) | |
1295 | { | |
1296 | if (debug_linux_nat) | |
1297 | fprintf_unfiltered (gdb_stdlog, | |
1298 | "LNPAW: Attaching to a stopped process\n"); | |
1299 | ||
1300 | /* The process is definitely stopped. It is in a job control | |
1301 | stop, unless the kernel predates the TASK_STOPPED / | |
1302 | TASK_TRACED distinction, in which case it might be in a | |
1303 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1304 | can kill it, signal it, et cetera. | |
1305 | ||
1306 | First make sure there is a pending SIGSTOP. Since we are | |
1307 | already attached, the process can not transition from stopped | |
1308 | to running without a PTRACE_CONT; so we know this signal will | |
1309 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1310 | probably already in the queue (unless this kernel is old | |
1311 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1312 | is not an RT signal, it can only be queued once. */ | |
1313 | kill_lwp (pid, SIGSTOP); | |
1314 | ||
1315 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1316 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1317 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1318 | } | |
1319 | ||
1320 | /* Make sure the initial process is stopped. The user-level threads | |
1321 | layer might want to poke around in the inferior, and that won't | |
1322 | work if things haven't stabilized yet. */ | |
1323 | new_pid = my_waitpid (pid, &status, 0); | |
1324 | if (new_pid == -1 && errno == ECHILD) | |
1325 | { | |
1326 | if (first) | |
1327 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1328 | ||
1329 | /* Try again with __WCLONE to check cloned processes. */ | |
1330 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1331 | *cloned = 1; | |
1332 | } | |
1333 | ||
1334 | gdb_assert (pid == new_pid && WIFSTOPPED (status)); | |
1335 | ||
1336 | if (WSTOPSIG (status) != SIGSTOP) | |
1337 | { | |
1338 | *signalled = 1; | |
1339 | if (debug_linux_nat) | |
1340 | fprintf_unfiltered (gdb_stdlog, | |
1341 | "LNPAW: Received %s after attaching\n", | |
1342 | status_to_str (status)); | |
1343 | } | |
1344 | ||
1345 | return status; | |
1346 | } | |
1347 | ||
1348 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1349 | if the new LWP could not be attached. */ | |
d6b0e80f | 1350 | |
9ee57c33 | 1351 | int |
93815fbf | 1352 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1353 | { |
9ee57c33 | 1354 | struct lwp_info *lp; |
7feb7d06 | 1355 | sigset_t prev_mask; |
d6b0e80f AC |
1356 | |
1357 | gdb_assert (is_lwp (ptid)); | |
1358 | ||
7feb7d06 | 1359 | block_child_signals (&prev_mask); |
d6b0e80f | 1360 | |
9ee57c33 | 1361 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1362 | |
1363 | /* We assume that we're already attached to any LWP that has an id | |
1364 | equal to the overall process id, and to any LWP that is already | |
1365 | in our list of LWPs. If we're not seeing exit events from threads | |
1366 | and we've had PID wraparound since we last tried to stop all threads, | |
1367 | this assumption might be wrong; fortunately, this is very unlikely | |
1368 | to happen. */ | |
9ee57c33 | 1369 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1370 | { |
a0ef4274 | 1371 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1372 | |
1373 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1374 | { |
1375 | /* If we fail to attach to the thread, issue a warning, | |
1376 | but continue. One way this can happen is if thread | |
e9efe249 | 1377 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1378 | bug may place threads in the thread list and then fail |
1379 | to create them. */ | |
1380 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1381 | safe_strerror (errno)); | |
7feb7d06 | 1382 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1383 | return -1; |
1384 | } | |
1385 | ||
d6b0e80f AC |
1386 | if (debug_linux_nat) |
1387 | fprintf_unfiltered (gdb_stdlog, | |
1388 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1389 | target_pid_to_str (ptid)); | |
1390 | ||
a0ef4274 DJ |
1391 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
1392 | lp = add_lwp (ptid); | |
1393 | lp->stopped = 1; | |
1394 | lp->cloned = cloned; | |
1395 | lp->signalled = signalled; | |
1396 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1397 | { |
a0ef4274 DJ |
1398 | lp->resumed = 1; |
1399 | lp->status = status; | |
d6b0e80f AC |
1400 | } |
1401 | ||
a0ef4274 | 1402 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1403 | |
1404 | if (debug_linux_nat) | |
1405 | { | |
1406 | fprintf_unfiltered (gdb_stdlog, | |
1407 | "LLAL: waitpid %s received %s\n", | |
1408 | target_pid_to_str (ptid), | |
1409 | status_to_str (status)); | |
1410 | } | |
1411 | } | |
1412 | else | |
1413 | { | |
1414 | /* We assume that the LWP representing the original process is | |
1415 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1416 | that the GNU/linux ptrace layer uses to keep track of |
1417 | threads. Note that this won't have already been done since | |
1418 | the main thread will have, we assume, been stopped by an | |
1419 | attach from a different layer. */ | |
9ee57c33 DJ |
1420 | if (lp == NULL) |
1421 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1422 | lp->stopped = 1; |
1423 | } | |
9ee57c33 | 1424 | |
7feb7d06 | 1425 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1426 | return 0; |
d6b0e80f AC |
1427 | } |
1428 | ||
b84876c2 | 1429 | static void |
136d6dae VP |
1430 | linux_nat_create_inferior (struct target_ops *ops, |
1431 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1432 | int from_tty) |
1433 | { | |
10568435 JK |
1434 | #ifdef HAVE_PERSONALITY |
1435 | int personality_orig = 0, personality_set = 0; | |
1436 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1437 | |
1438 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1439 | we have to mask the async mode. */ | |
1440 | ||
10568435 JK |
1441 | #ifdef HAVE_PERSONALITY |
1442 | if (disable_randomization) | |
1443 | { | |
1444 | errno = 0; | |
1445 | personality_orig = personality (0xffffffff); | |
1446 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1447 | { | |
1448 | personality_set = 1; | |
1449 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1450 | } | |
1451 | if (errno != 0 || (personality_set | |
1452 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1453 | warning (_("Error disabling address space randomization: %s"), | |
1454 | safe_strerror (errno)); | |
1455 | } | |
1456 | #endif /* HAVE_PERSONALITY */ | |
1457 | ||
136d6dae | 1458 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1459 | |
10568435 JK |
1460 | #ifdef HAVE_PERSONALITY |
1461 | if (personality_set) | |
1462 | { | |
1463 | errno = 0; | |
1464 | personality (personality_orig); | |
1465 | if (errno != 0) | |
1466 | warning (_("Error restoring address space randomization: %s"), | |
1467 | safe_strerror (errno)); | |
1468 | } | |
1469 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1470 | } |
1471 | ||
d6b0e80f | 1472 | static void |
136d6dae | 1473 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1474 | { |
1475 | struct lwp_info *lp; | |
d6b0e80f | 1476 | int status; |
af990527 | 1477 | ptid_t ptid; |
d6b0e80f | 1478 | |
136d6dae | 1479 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1480 | |
af990527 PA |
1481 | /* The ptrace base target adds the main thread with (pid,0,0) |
1482 | format. Decorate it with lwp info. */ | |
1483 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1484 | thread_change_ptid (inferior_ptid, ptid); | |
1485 | ||
9f0bdab8 | 1486 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1487 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1488 | |
1489 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1490 | &lp->signalled); | |
1491 | lp->stopped = 1; | |
9f0bdab8 | 1492 | |
a0ef4274 | 1493 | /* Save the wait status to report later. */ |
d6b0e80f | 1494 | lp->resumed = 1; |
a0ef4274 DJ |
1495 | if (debug_linux_nat) |
1496 | fprintf_unfiltered (gdb_stdlog, | |
1497 | "LNA: waitpid %ld, saving status %s\n", | |
1498 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1499 | |
7feb7d06 PA |
1500 | lp->status = status; |
1501 | ||
1502 | if (target_can_async_p ()) | |
1503 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1504 | } |
1505 | ||
a0ef4274 DJ |
1506 | /* Get pending status of LP. */ |
1507 | static int | |
1508 | get_pending_status (struct lwp_info *lp, int *status) | |
1509 | { | |
1510 | struct target_waitstatus last; | |
1511 | ptid_t last_ptid; | |
1512 | ||
1513 | get_last_target_status (&last_ptid, &last); | |
1514 | ||
1515 | /* If this lwp is the ptid that GDB is processing an event from, the | |
7feb7d06 PA |
1516 | signal will be in stop_signal. Otherwise, we may cache pending |
1517 | events in lp->status while trying to stop all threads (see | |
1518 | stop_wait_callback). */ | |
a0ef4274 DJ |
1519 | |
1520 | *status = 0; | |
4c28f408 PA |
1521 | |
1522 | if (non_stop) | |
a0ef4274 | 1523 | { |
4c28f408 PA |
1524 | enum target_signal signo = TARGET_SIGNAL_0; |
1525 | ||
1526 | if (is_executing (lp->ptid)) | |
1527 | { | |
1528 | /* If the core thought this lwp was executing --- e.g., the | |
1529 | executing property hasn't been updated yet, but the | |
1530 | thread has been stopped with a stop_callback / | |
1531 | stop_wait_callback sequence (see linux_nat_detach for | |
1532 | example) --- we can only have pending events in the local | |
1533 | queue. */ | |
7feb7d06 | 1534 | signo = target_signal_from_host (WSTOPSIG (lp->status)); |
4c28f408 PA |
1535 | } |
1536 | else | |
1537 | { | |
1538 | /* If the core knows the thread is not executing, then we | |
1539 | have the last signal recorded in | |
2020b7ab | 1540 | thread_info->stop_signal. */ |
4c28f408 | 1541 | |
e09875d4 | 1542 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
2020b7ab | 1543 | signo = tp->stop_signal; |
4c28f408 PA |
1544 | } |
1545 | ||
1546 | if (signo != TARGET_SIGNAL_0 | |
1547 | && !signal_pass_state (signo)) | |
1548 | { | |
1549 | if (debug_linux_nat) | |
1550 | fprintf_unfiltered (gdb_stdlog, "\ | |
1551 | GPT: lwp %s had signal %s, but it is in no pass state\n", | |
1552 | target_pid_to_str (lp->ptid), | |
1553 | target_signal_to_string (signo)); | |
1554 | } | |
1555 | else | |
1556 | { | |
1557 | if (signo != TARGET_SIGNAL_0) | |
1558 | *status = W_STOPCODE (target_signal_to_host (signo)); | |
1559 | ||
1560 | if (debug_linux_nat) | |
1561 | fprintf_unfiltered (gdb_stdlog, | |
1562 | "GPT: lwp %s as pending signal %s\n", | |
1563 | target_pid_to_str (lp->ptid), | |
1564 | target_signal_to_string (signo)); | |
1565 | } | |
a0ef4274 | 1566 | } |
a0ef4274 | 1567 | else |
4c28f408 PA |
1568 | { |
1569 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) | |
1570 | { | |
e09875d4 | 1571 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
2020b7ab PA |
1572 | if (tp->stop_signal != TARGET_SIGNAL_0 |
1573 | && signal_pass_state (tp->stop_signal)) | |
1574 | *status = W_STOPCODE (target_signal_to_host (tp->stop_signal)); | |
4c28f408 | 1575 | } |
4c28f408 PA |
1576 | else |
1577 | *status = lp->status; | |
1578 | } | |
a0ef4274 DJ |
1579 | |
1580 | return 0; | |
1581 | } | |
1582 | ||
d6b0e80f AC |
1583 | static int |
1584 | detach_callback (struct lwp_info *lp, void *data) | |
1585 | { | |
1586 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1587 | ||
1588 | if (debug_linux_nat && lp->status) | |
1589 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1590 | strsignal (WSTOPSIG (lp->status)), | |
1591 | target_pid_to_str (lp->ptid)); | |
1592 | ||
a0ef4274 DJ |
1593 | /* If there is a pending SIGSTOP, get rid of it. */ |
1594 | if (lp->signalled) | |
d6b0e80f | 1595 | { |
d6b0e80f AC |
1596 | if (debug_linux_nat) |
1597 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1598 | "DC: Sending SIGCONT to %s\n", |
1599 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1600 | |
a0ef4274 | 1601 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1602 | lp->signalled = 0; |
d6b0e80f AC |
1603 | } |
1604 | ||
1605 | /* We don't actually detach from the LWP that has an id equal to the | |
1606 | overall process id just yet. */ | |
1607 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1608 | { | |
a0ef4274 DJ |
1609 | int status = 0; |
1610 | ||
1611 | /* Pass on any pending signal for this LWP. */ | |
1612 | get_pending_status (lp, &status); | |
1613 | ||
d6b0e80f AC |
1614 | errno = 0; |
1615 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1616 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1617 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1618 | safe_strerror (errno)); |
1619 | ||
1620 | if (debug_linux_nat) | |
1621 | fprintf_unfiltered (gdb_stdlog, | |
1622 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1623 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1624 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1625 | |
1626 | delete_lwp (lp->ptid); | |
1627 | } | |
1628 | ||
1629 | return 0; | |
1630 | } | |
1631 | ||
1632 | static void | |
136d6dae | 1633 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1634 | { |
b84876c2 | 1635 | int pid; |
a0ef4274 DJ |
1636 | int status; |
1637 | enum target_signal sig; | |
d90e17a7 PA |
1638 | struct lwp_info *main_lwp; |
1639 | ||
1640 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1641 | |
b84876c2 PA |
1642 | if (target_can_async_p ()) |
1643 | linux_nat_async (NULL, 0); | |
1644 | ||
4c28f408 PA |
1645 | /* Stop all threads before detaching. ptrace requires that the |
1646 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1647 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1648 | /* ... and wait until all of them have reported back that |
1649 | they're no longer running. */ | |
d90e17a7 | 1650 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1651 | |
d90e17a7 | 1652 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1653 | |
1654 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1655 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1656 | ||
1657 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1658 | |
a0ef4274 DJ |
1659 | /* Pass on any pending signal for the last LWP. */ |
1660 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1661 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1662 | && WIFSTOPPED (status)) |
1663 | { | |
1664 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1665 | pass it along with PTRACE_DETACH. */ | |
1666 | args = alloca (8); | |
1667 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
1668 | fprintf_unfiltered (gdb_stdlog, | |
1669 | "LND: Sending signal %s to %s\n", | |
1670 | args, | |
d90e17a7 | 1671 | target_pid_to_str (main_lwp->ptid)); |
a0ef4274 DJ |
1672 | } |
1673 | ||
d90e17a7 | 1674 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1675 | |
7a7d3353 PA |
1676 | if (forks_exist_p ()) |
1677 | { | |
1678 | /* Multi-fork case. The current inferior_ptid is being detached | |
1679 | from, but there are other viable forks to debug. Detach from | |
1680 | the current fork, and context-switch to the first | |
1681 | available. */ | |
1682 | linux_fork_detach (args, from_tty); | |
1683 | ||
1684 | if (non_stop && target_can_async_p ()) | |
1685 | target_async (inferior_event_handler, 0); | |
1686 | } | |
1687 | else | |
1688 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1689 | } |
1690 | ||
1691 | /* Resume LP. */ | |
1692 | ||
1693 | static int | |
1694 | resume_callback (struct lwp_info *lp, void *data) | |
1695 | { | |
1696 | if (lp->stopped && lp->status == 0) | |
1697 | { | |
d90e17a7 PA |
1698 | if (debug_linux_nat) |
1699 | fprintf_unfiltered (gdb_stdlog, | |
1700 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", | |
1701 | target_pid_to_str (lp->ptid)); | |
1702 | ||
28439f5e PA |
1703 | linux_ops->to_resume (linux_ops, |
1704 | pid_to_ptid (GET_LWP (lp->ptid)), | |
10d6c8cd | 1705 | 0, TARGET_SIGNAL_0); |
d6b0e80f AC |
1706 | if (debug_linux_nat) |
1707 | fprintf_unfiltered (gdb_stdlog, | |
1708 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1709 | target_pid_to_str (lp->ptid)); | |
1710 | lp->stopped = 0; | |
1711 | lp->step = 0; | |
9f0bdab8 | 1712 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
d6b0e80f | 1713 | } |
57380f4e DJ |
1714 | else if (lp->stopped && debug_linux_nat) |
1715 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (has pending)\n", | |
1716 | target_pid_to_str (lp->ptid)); | |
1717 | else if (debug_linux_nat) | |
1718 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (not stopped)\n", | |
1719 | target_pid_to_str (lp->ptid)); | |
d6b0e80f AC |
1720 | |
1721 | return 0; | |
1722 | } | |
1723 | ||
1724 | static int | |
1725 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1726 | { | |
1727 | lp->resumed = 0; | |
1728 | return 0; | |
1729 | } | |
1730 | ||
1731 | static int | |
1732 | resume_set_callback (struct lwp_info *lp, void *data) | |
1733 | { | |
1734 | lp->resumed = 1; | |
1735 | return 0; | |
1736 | } | |
1737 | ||
1738 | static void | |
28439f5e PA |
1739 | linux_nat_resume (struct target_ops *ops, |
1740 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1741 | { |
7feb7d06 | 1742 | sigset_t prev_mask; |
d6b0e80f | 1743 | struct lwp_info *lp; |
d90e17a7 | 1744 | int resume_many; |
d6b0e80f | 1745 | |
76f50ad1 DJ |
1746 | if (debug_linux_nat) |
1747 | fprintf_unfiltered (gdb_stdlog, | |
1748 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1749 | step ? "step" : "resume", | |
1750 | target_pid_to_str (ptid), | |
1751 | signo ? strsignal (signo) : "0", | |
1752 | target_pid_to_str (inferior_ptid)); | |
1753 | ||
7feb7d06 | 1754 | block_child_signals (&prev_mask); |
b84876c2 | 1755 | |
d6b0e80f | 1756 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1757 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1758 | || ptid_is_pid (ptid)); | |
4c28f408 PA |
1759 | |
1760 | if (!non_stop) | |
1761 | { | |
d90e17a7 PA |
1762 | /* Mark the lwps we're resuming as resumed. */ |
1763 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
1764 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
4c28f408 | 1765 | } |
d90e17a7 PA |
1766 | else |
1767 | iterate_over_lwps (minus_one_ptid, resume_set_callback, NULL); | |
d6b0e80f | 1768 | |
d90e17a7 PA |
1769 | /* See if it's the current inferior that should be handled |
1770 | specially. */ | |
1771 | if (resume_many) | |
1772 | lp = find_lwp_pid (inferior_ptid); | |
1773 | else | |
1774 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1775 | gdb_assert (lp != NULL); |
d6b0e80f | 1776 | |
9f0bdab8 DJ |
1777 | /* Remember if we're stepping. */ |
1778 | lp->step = step; | |
d6b0e80f | 1779 | |
9f0bdab8 DJ |
1780 | /* If we have a pending wait status for this thread, there is no |
1781 | point in resuming the process. But first make sure that | |
1782 | linux_nat_wait won't preemptively handle the event - we | |
1783 | should never take this short-circuit if we are going to | |
1784 | leave LP running, since we have skipped resuming all the | |
1785 | other threads. This bit of code needs to be synchronized | |
1786 | with linux_nat_wait. */ | |
76f50ad1 | 1787 | |
9f0bdab8 DJ |
1788 | if (lp->status && WIFSTOPPED (lp->status)) |
1789 | { | |
d6b48e9c PA |
1790 | int saved_signo; |
1791 | struct inferior *inf; | |
76f50ad1 | 1792 | |
d90e17a7 | 1793 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); |
d6b48e9c PA |
1794 | gdb_assert (inf); |
1795 | saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1796 | ||
1797 | /* Defer to common code if we're gaining control of the | |
1798 | inferior. */ | |
1799 | if (inf->stop_soon == NO_STOP_QUIETLY | |
1800 | && signal_stop_state (saved_signo) == 0 | |
9f0bdab8 DJ |
1801 | && signal_print_state (saved_signo) == 0 |
1802 | && signal_pass_state (saved_signo) == 1) | |
d6b0e80f | 1803 | { |
9f0bdab8 DJ |
1804 | if (debug_linux_nat) |
1805 | fprintf_unfiltered (gdb_stdlog, | |
1806 | "LLR: Not short circuiting for ignored " | |
1807 | "status 0x%x\n", lp->status); | |
1808 | ||
d6b0e80f AC |
1809 | /* FIXME: What should we do if we are supposed to continue |
1810 | this thread with a signal? */ | |
1811 | gdb_assert (signo == TARGET_SIGNAL_0); | |
9f0bdab8 DJ |
1812 | signo = saved_signo; |
1813 | lp->status = 0; | |
1814 | } | |
1815 | } | |
76f50ad1 | 1816 | |
9f0bdab8 DJ |
1817 | if (lp->status) |
1818 | { | |
1819 | /* FIXME: What should we do if we are supposed to continue | |
1820 | this thread with a signal? */ | |
1821 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1822 | |
9f0bdab8 DJ |
1823 | if (debug_linux_nat) |
1824 | fprintf_unfiltered (gdb_stdlog, | |
1825 | "LLR: Short circuiting for status 0x%x\n", | |
1826 | lp->status); | |
d6b0e80f | 1827 | |
7feb7d06 PA |
1828 | restore_child_signals_mask (&prev_mask); |
1829 | if (target_can_async_p ()) | |
1830 | { | |
1831 | target_async (inferior_event_handler, 0); | |
1832 | /* Tell the event loop we have something to process. */ | |
1833 | async_file_mark (); | |
1834 | } | |
9f0bdab8 | 1835 | return; |
d6b0e80f AC |
1836 | } |
1837 | ||
9f0bdab8 DJ |
1838 | /* Mark LWP as not stopped to prevent it from being continued by |
1839 | resume_callback. */ | |
1840 | lp->stopped = 0; | |
1841 | ||
d90e17a7 PA |
1842 | if (resume_many) |
1843 | iterate_over_lwps (ptid, resume_callback, NULL); | |
1844 | ||
1845 | /* Convert to something the lower layer understands. */ | |
1846 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 1847 | |
28439f5e | 1848 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 DJ |
1849 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
1850 | ||
d6b0e80f AC |
1851 | if (debug_linux_nat) |
1852 | fprintf_unfiltered (gdb_stdlog, | |
1853 | "LLR: %s %s, %s (resume event thread)\n", | |
1854 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1855 | target_pid_to_str (ptid), | |
1856 | signo ? strsignal (signo) : "0"); | |
b84876c2 | 1857 | |
7feb7d06 | 1858 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 1859 | if (target_can_async_p ()) |
8ea051c5 | 1860 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1861 | } |
1862 | ||
1863 | /* Issue kill to specified lwp. */ | |
1864 | ||
1865 | static int tkill_failed; | |
1866 | ||
1867 | static int | |
1868 | kill_lwp (int lwpid, int signo) | |
1869 | { | |
1870 | errno = 0; | |
1871 | ||
1872 | /* Use tkill, if possible, in case we are using nptl threads. If tkill | |
1873 | fails, then we are not using nptl threads and we should be using kill. */ | |
1874 | ||
1875 | #ifdef HAVE_TKILL_SYSCALL | |
1876 | if (!tkill_failed) | |
1877 | { | |
1878 | int ret = syscall (__NR_tkill, lwpid, signo); | |
1879 | if (errno != ENOSYS) | |
1880 | return ret; | |
1881 | errno = 0; | |
1882 | tkill_failed = 1; | |
1883 | } | |
1884 | #endif | |
1885 | ||
1886 | return kill (lwpid, signo); | |
1887 | } | |
1888 | ||
3d799a95 DJ |
1889 | /* Handle a GNU/Linux extended wait response. If we see a clone |
1890 | event, we need to add the new LWP to our list (and not report the | |
1891 | trap to higher layers). This function returns non-zero if the | |
1892 | event should be ignored and we should wait again. If STOPPING is | |
1893 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
1894 | |
1895 | static int | |
3d799a95 DJ |
1896 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
1897 | int stopping) | |
d6b0e80f | 1898 | { |
3d799a95 DJ |
1899 | int pid = GET_LWP (lp->ptid); |
1900 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
1901 | struct lwp_info *new_lp = NULL; | |
1902 | int event = status >> 16; | |
d6b0e80f | 1903 | |
3d799a95 DJ |
1904 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
1905 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 1906 | { |
3d799a95 DJ |
1907 | unsigned long new_pid; |
1908 | int ret; | |
1909 | ||
1910 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 1911 | |
3d799a95 DJ |
1912 | /* If we haven't already seen the new PID stop, wait for it now. */ |
1913 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
1914 | { | |
1915 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
1916 | hits the SIGSTOP, but we're already attached. */ | |
1917 | ret = my_waitpid (new_pid, &status, | |
1918 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
1919 | if (ret == -1) | |
1920 | perror_with_name (_("waiting for new child")); | |
1921 | else if (ret != new_pid) | |
1922 | internal_error (__FILE__, __LINE__, | |
1923 | _("wait returned unexpected PID %d"), ret); | |
1924 | else if (!WIFSTOPPED (status)) | |
1925 | internal_error (__FILE__, __LINE__, | |
1926 | _("wait returned unexpected status 0x%x"), status); | |
1927 | } | |
1928 | ||
3a3e9ee3 | 1929 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 1930 | |
2277426b PA |
1931 | if (event == PTRACE_EVENT_FORK |
1932 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
1933 | { | |
1934 | struct fork_info *fp; | |
1935 | ||
1936 | /* Handle checkpointing by linux-fork.c here as a special | |
1937 | case. We don't want the follow-fork-mode or 'catch fork' | |
1938 | to interfere with this. */ | |
1939 | ||
1940 | /* This won't actually modify the breakpoint list, but will | |
1941 | physically remove the breakpoints from the child. */ | |
1942 | detach_breakpoints (new_pid); | |
1943 | ||
1944 | /* Retain child fork in ptrace (stopped) state. */ | |
1945 | fp = find_fork_pid (new_pid); | |
1946 | if (!fp) | |
1947 | fp = add_fork (new_pid); | |
1948 | ||
1949 | /* Report as spurious, so that infrun doesn't want to follow | |
1950 | this fork. We're actually doing an infcall in | |
1951 | linux-fork.c. */ | |
1952 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
1953 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
1954 | ||
1955 | /* Report the stop to the core. */ | |
1956 | return 0; | |
1957 | } | |
1958 | ||
3d799a95 DJ |
1959 | if (event == PTRACE_EVENT_FORK) |
1960 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
1961 | else if (event == PTRACE_EVENT_VFORK) | |
1962 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 1963 | else |
3d799a95 | 1964 | { |
4c28f408 PA |
1965 | struct cleanup *old_chain; |
1966 | ||
3d799a95 | 1967 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
d90e17a7 | 1968 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 1969 | new_lp->cloned = 1; |
4c28f408 | 1970 | new_lp->stopped = 1; |
d6b0e80f | 1971 | |
3d799a95 DJ |
1972 | if (WSTOPSIG (status) != SIGSTOP) |
1973 | { | |
1974 | /* This can happen if someone starts sending signals to | |
1975 | the new thread before it gets a chance to run, which | |
1976 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
1977 | This is an unlikely case, and harder to handle for | |
1978 | fork / vfork than for clone, so we do not try - but | |
1979 | we handle it for clone events here. We'll send | |
1980 | the other signal on to the thread below. */ | |
1981 | ||
1982 | new_lp->signalled = 1; | |
1983 | } | |
1984 | else | |
1985 | status = 0; | |
d6b0e80f | 1986 | |
4c28f408 | 1987 | if (non_stop) |
3d799a95 | 1988 | { |
4c28f408 PA |
1989 | /* Add the new thread to GDB's lists as soon as possible |
1990 | so that: | |
1991 | ||
1992 | 1) the frontend doesn't have to wait for a stop to | |
1993 | display them, and, | |
1994 | ||
1995 | 2) we tag it with the correct running state. */ | |
1996 | ||
1997 | /* If the thread_db layer is active, let it know about | |
1998 | this new thread, and add it to GDB's list. */ | |
1999 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2000 | { | |
2001 | /* We're not using thread_db. Add it to GDB's | |
2002 | list. */ | |
2003 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2004 | add_thread (new_lp->ptid); | |
2005 | } | |
2006 | ||
2007 | if (!stopping) | |
2008 | { | |
2009 | set_running (new_lp->ptid, 1); | |
2010 | set_executing (new_lp->ptid, 1); | |
2011 | } | |
2012 | } | |
2013 | ||
2014 | if (!stopping) | |
2015 | { | |
2016 | new_lp->stopped = 0; | |
3d799a95 | 2017 | new_lp->resumed = 1; |
4c28f408 | 2018 | ptrace (PTRACE_CONT, new_pid, 0, |
3d799a95 DJ |
2019 | status ? WSTOPSIG (status) : 0); |
2020 | } | |
d6b0e80f | 2021 | |
3d799a95 DJ |
2022 | if (debug_linux_nat) |
2023 | fprintf_unfiltered (gdb_stdlog, | |
2024 | "LHEW: Got clone event from LWP %ld, resuming\n", | |
2025 | GET_LWP (lp->ptid)); | |
2026 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2027 | ||
2028 | return 1; | |
2029 | } | |
2030 | ||
2031 | return 0; | |
d6b0e80f AC |
2032 | } |
2033 | ||
3d799a95 DJ |
2034 | if (event == PTRACE_EVENT_EXEC) |
2035 | { | |
a75724bc PA |
2036 | if (debug_linux_nat) |
2037 | fprintf_unfiltered (gdb_stdlog, | |
2038 | "LHEW: Got exec event from LWP %ld\n", | |
2039 | GET_LWP (lp->ptid)); | |
2040 | ||
3d799a95 DJ |
2041 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2042 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2043 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 DJ |
2044 | |
2045 | if (linux_parent_pid) | |
2046 | { | |
2047 | detach_breakpoints (linux_parent_pid); | |
2048 | ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0); | |
2049 | ||
2050 | linux_parent_pid = 0; | |
2051 | } | |
2052 | ||
25b22b0a PA |
2053 | /* At this point, all inserted breakpoints are gone. Doing this |
2054 | as soon as we detect an exec prevents the badness of deleting | |
2055 | a breakpoint writing the current "shadow contents" to lift | |
2056 | the bp. That shadow is NOT valid after an exec. | |
2057 | ||
2058 | Note that we have to do this after the detach_breakpoints | |
2059 | call above, otherwise breakpoints wouldn't be lifted from the | |
2060 | parent on a vfork, because detach_breakpoints would think | |
2061 | that breakpoints are not inserted. */ | |
2062 | mark_breakpoints_out (); | |
3d799a95 DJ |
2063 | return 0; |
2064 | } | |
2065 | ||
a96d9b2e SDJ |
2066 | /* Used for 'catch syscall' feature. */ |
2067 | if (WSTOPSIG (status) == TRAP_IS_SYSCALL) | |
2068 | { | |
2069 | if (catch_syscall_enabled () == 0) | |
2070 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2071 | else | |
2072 | { | |
2073 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
2074 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2075 | ||
2076 | ourstatus->value.syscall_number = | |
2077 | (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2078 | ||
2079 | /* If we are catching this specific syscall number, then we | |
2080 | should update the target_status to reflect which event | |
2081 | has occurred. But if this syscall is not to be caught, | |
2082 | then we can safely mark the event as a SYSCALL_RETURN. | |
2083 | ||
2084 | This is particularly needed if: | |
2085 | ||
2086 | - We are catching any syscalls, or | |
2087 | - We are catching the syscall "exit" | |
2088 | ||
2089 | In this case, as the syscall "exit" *doesn't* return, | |
2090 | then GDB would be confused because it would mark the last | |
2091 | syscall event as a SYSCALL_ENTRY. After that, if we re-ran the | |
2092 | inferior GDB will think that the first syscall event is | |
2093 | the opposite of a SYSCALL_ENTRY, which is the SYSCALL_RETURN. | |
2094 | Therefore, GDB would report inverted syscall events. */ | |
2095 | if (catching_syscall_number (ourstatus->value.syscall_number)) | |
2096 | ourstatus->kind = | |
2097 | (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY) ? | |
2098 | TARGET_WAITKIND_SYSCALL_RETURN : TARGET_WAITKIND_SYSCALL_ENTRY; | |
2099 | else | |
2100 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
2101 | ||
2102 | lp->syscall_state = ourstatus->kind; | |
2103 | } | |
2104 | return 0; | |
2105 | } | |
2106 | ||
3d799a95 DJ |
2107 | internal_error (__FILE__, __LINE__, |
2108 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2109 | } |
2110 | ||
2111 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
2112 | exited. */ | |
2113 | ||
2114 | static int | |
2115 | wait_lwp (struct lwp_info *lp) | |
2116 | { | |
2117 | pid_t pid; | |
2118 | int status; | |
2119 | int thread_dead = 0; | |
2120 | ||
2121 | gdb_assert (!lp->stopped); | |
2122 | gdb_assert (lp->status == 0); | |
2123 | ||
58aecb61 | 2124 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
2125 | if (pid == -1 && errno == ECHILD) |
2126 | { | |
58aecb61 | 2127 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
2128 | if (pid == -1 && errno == ECHILD) |
2129 | { | |
2130 | /* The thread has previously exited. We need to delete it | |
2131 | now because, for some vendor 2.4 kernels with NPTL | |
2132 | support backported, there won't be an exit event unless | |
2133 | it is the main thread. 2.6 kernels will report an exit | |
2134 | event for each thread that exits, as expected. */ | |
2135 | thread_dead = 1; | |
2136 | if (debug_linux_nat) | |
2137 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2138 | target_pid_to_str (lp->ptid)); | |
2139 | } | |
2140 | } | |
2141 | ||
2142 | if (!thread_dead) | |
2143 | { | |
2144 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2145 | ||
2146 | if (debug_linux_nat) | |
2147 | { | |
2148 | fprintf_unfiltered (gdb_stdlog, | |
2149 | "WL: waitpid %s received %s\n", | |
2150 | target_pid_to_str (lp->ptid), | |
2151 | status_to_str (status)); | |
2152 | } | |
2153 | } | |
2154 | ||
2155 | /* Check if the thread has exited. */ | |
2156 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2157 | { | |
2158 | thread_dead = 1; | |
2159 | if (debug_linux_nat) | |
2160 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2161 | target_pid_to_str (lp->ptid)); | |
2162 | } | |
2163 | ||
2164 | if (thread_dead) | |
2165 | { | |
e26af52f | 2166 | exit_lwp (lp); |
d6b0e80f AC |
2167 | return 0; |
2168 | } | |
2169 | ||
2170 | gdb_assert (WIFSTOPPED (status)); | |
2171 | ||
2172 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
2173 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2174 | { | |
2175 | if (debug_linux_nat) | |
2176 | fprintf_unfiltered (gdb_stdlog, | |
2177 | "WL: Handling extended status 0x%06x\n", | |
2178 | status); | |
3d799a95 | 2179 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2180 | return wait_lwp (lp); |
2181 | } | |
2182 | ||
2183 | return status; | |
2184 | } | |
2185 | ||
9f0bdab8 DJ |
2186 | /* Save the most recent siginfo for LP. This is currently only called |
2187 | for SIGTRAP; some ports use the si_addr field for | |
2188 | target_stopped_data_address. In the future, it may also be used to | |
2189 | restore the siginfo of requeued signals. */ | |
2190 | ||
2191 | static void | |
2192 | save_siginfo (struct lwp_info *lp) | |
2193 | { | |
2194 | errno = 0; | |
2195 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2196 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2197 | ||
2198 | if (errno != 0) | |
2199 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2200 | } | |
2201 | ||
d6b0e80f AC |
2202 | /* Send a SIGSTOP to LP. */ |
2203 | ||
2204 | static int | |
2205 | stop_callback (struct lwp_info *lp, void *data) | |
2206 | { | |
2207 | if (!lp->stopped && !lp->signalled) | |
2208 | { | |
2209 | int ret; | |
2210 | ||
2211 | if (debug_linux_nat) | |
2212 | { | |
2213 | fprintf_unfiltered (gdb_stdlog, | |
2214 | "SC: kill %s **<SIGSTOP>**\n", | |
2215 | target_pid_to_str (lp->ptid)); | |
2216 | } | |
2217 | errno = 0; | |
2218 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2219 | if (debug_linux_nat) | |
2220 | { | |
2221 | fprintf_unfiltered (gdb_stdlog, | |
2222 | "SC: lwp kill %d %s\n", | |
2223 | ret, | |
2224 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2225 | } | |
2226 | ||
2227 | lp->signalled = 1; | |
2228 | gdb_assert (lp->status == 0); | |
2229 | } | |
2230 | ||
2231 | return 0; | |
2232 | } | |
2233 | ||
57380f4e | 2234 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2235 | |
2236 | static int | |
57380f4e DJ |
2237 | linux_nat_has_pending_sigint (int pid) |
2238 | { | |
2239 | sigset_t pending, blocked, ignored; | |
2240 | int i; | |
2241 | ||
2242 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2243 | ||
2244 | if (sigismember (&pending, SIGINT) | |
2245 | && !sigismember (&ignored, SIGINT)) | |
2246 | return 1; | |
2247 | ||
2248 | return 0; | |
2249 | } | |
2250 | ||
2251 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2252 | ||
2253 | static int | |
2254 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2255 | { |
57380f4e DJ |
2256 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2257 | flag to consume the next one. */ | |
2258 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2259 | && WSTOPSIG (lp->status) == SIGINT) | |
2260 | lp->status = 0; | |
2261 | else | |
2262 | lp->ignore_sigint = 1; | |
2263 | ||
2264 | return 0; | |
2265 | } | |
2266 | ||
2267 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2268 | This function is called after we know the LWP has stopped; if the LWP | |
2269 | stopped before the expected SIGINT was delivered, then it will never have | |
2270 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2271 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2272 | |
57380f4e DJ |
2273 | static void |
2274 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2275 | { | |
2276 | if (!lp->ignore_sigint) | |
2277 | return; | |
2278 | ||
2279 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2280 | { | |
2281 | if (debug_linux_nat) | |
2282 | fprintf_unfiltered (gdb_stdlog, | |
2283 | "MCIS: Clearing bogus flag for %s\n", | |
2284 | target_pid_to_str (lp->ptid)); | |
2285 | lp->ignore_sigint = 0; | |
2286 | } | |
2287 | } | |
2288 | ||
2289 | /* Wait until LP is stopped. */ | |
2290 | ||
2291 | static int | |
2292 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2293 | { | |
d6b0e80f AC |
2294 | if (!lp->stopped) |
2295 | { | |
2296 | int status; | |
2297 | ||
2298 | status = wait_lwp (lp); | |
2299 | if (status == 0) | |
2300 | return 0; | |
2301 | ||
57380f4e DJ |
2302 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2303 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2304 | { |
57380f4e | 2305 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2306 | |
2307 | errno = 0; | |
2308 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2309 | if (debug_linux_nat) | |
2310 | fprintf_unfiltered (gdb_stdlog, | |
57380f4e | 2311 | "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n", |
d6b0e80f AC |
2312 | target_pid_to_str (lp->ptid), |
2313 | errno ? safe_strerror (errno) : "OK"); | |
2314 | ||
57380f4e | 2315 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2316 | } |
2317 | ||
57380f4e DJ |
2318 | maybe_clear_ignore_sigint (lp); |
2319 | ||
d6b0e80f AC |
2320 | if (WSTOPSIG (status) != SIGSTOP) |
2321 | { | |
2322 | if (WSTOPSIG (status) == SIGTRAP) | |
2323 | { | |
2324 | /* If a LWP other than the LWP that we're reporting an | |
2325 | event for has hit a GDB breakpoint (as opposed to | |
2326 | some random trap signal), then just arrange for it to | |
2327 | hit it again later. We don't keep the SIGTRAP status | |
2328 | and don't forward the SIGTRAP signal to the LWP. We | |
2329 | will handle the current event, eventually we will | |
2330 | resume all LWPs, and this one will get its breakpoint | |
2331 | trap again. | |
2332 | ||
2333 | If we do not do this, then we run the risk that the | |
2334 | user will delete or disable the breakpoint, but the | |
2335 | thread will have already tripped on it. */ | |
2336 | ||
9f0bdab8 DJ |
2337 | /* Save the trap's siginfo in case we need it later. */ |
2338 | save_siginfo (lp); | |
2339 | ||
d6b0e80f AC |
2340 | /* Now resume this LWP and get the SIGSTOP event. */ |
2341 | errno = 0; | |
2342 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2343 | if (debug_linux_nat) | |
2344 | { | |
2345 | fprintf_unfiltered (gdb_stdlog, | |
2346 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2347 | target_pid_to_str (lp->ptid), | |
2348 | errno ? safe_strerror (errno) : "OK"); | |
2349 | ||
2350 | fprintf_unfiltered (gdb_stdlog, | |
2351 | "SWC: Candidate SIGTRAP event in %s\n", | |
2352 | target_pid_to_str (lp->ptid)); | |
2353 | } | |
710151dd PA |
2354 | /* Hold this event/waitstatus while we check to see if |
2355 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2356 | stop_wait_callback (lp, NULL); |
710151dd | 2357 | |
7feb7d06 PA |
2358 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2359 | there's another event, throw it back into the | |
2360 | queue. */ | |
2361 | if (lp->status) | |
710151dd | 2362 | { |
7feb7d06 PA |
2363 | if (debug_linux_nat) |
2364 | fprintf_unfiltered (gdb_stdlog, | |
2365 | "SWC: kill %s, %s\n", | |
2366 | target_pid_to_str (lp->ptid), | |
2367 | status_to_str ((int) status)); | |
2368 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2369 | } |
7feb7d06 PA |
2370 | |
2371 | /* Save the sigtrap event. */ | |
2372 | lp->status = status; | |
d6b0e80f AC |
2373 | return 0; |
2374 | } | |
2375 | else | |
2376 | { | |
2377 | /* The thread was stopped with a signal other than | |
2378 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
2379 | ||
2380 | if (debug_linux_nat) | |
2381 | { | |
2382 | fprintf_unfiltered (gdb_stdlog, | |
2383 | "SWC: Pending event %s in %s\n", | |
2384 | status_to_str ((int) status), | |
2385 | target_pid_to_str (lp->ptid)); | |
2386 | } | |
2387 | /* Now resume this LWP and get the SIGSTOP event. */ | |
2388 | errno = 0; | |
2389 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2390 | if (debug_linux_nat) | |
2391 | fprintf_unfiltered (gdb_stdlog, | |
2392 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2393 | target_pid_to_str (lp->ptid), | |
2394 | errno ? safe_strerror (errno) : "OK"); | |
2395 | ||
2396 | /* Hold this event/waitstatus while we check to see if | |
2397 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2398 | stop_wait_callback (lp, NULL); |
710151dd PA |
2399 | |
2400 | /* If the lp->status field is still empty, use it to | |
2401 | hold this event. If not, then this event must be | |
2402 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2403 | if (lp->status) |
d6b0e80f AC |
2404 | { |
2405 | if (debug_linux_nat) | |
2406 | { | |
2407 | fprintf_unfiltered (gdb_stdlog, | |
2408 | "SWC: kill %s, %s\n", | |
2409 | target_pid_to_str (lp->ptid), | |
2410 | status_to_str ((int) status)); | |
2411 | } | |
2412 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2413 | } | |
710151dd PA |
2414 | else |
2415 | lp->status = status; | |
d6b0e80f AC |
2416 | return 0; |
2417 | } | |
2418 | } | |
2419 | else | |
2420 | { | |
2421 | /* We caught the SIGSTOP that we intended to catch, so | |
2422 | there's no SIGSTOP pending. */ | |
2423 | lp->stopped = 1; | |
2424 | lp->signalled = 0; | |
2425 | } | |
2426 | } | |
2427 | ||
2428 | return 0; | |
2429 | } | |
2430 | ||
d6b0e80f AC |
2431 | /* Return non-zero if LP has a wait status pending. */ |
2432 | ||
2433 | static int | |
2434 | status_callback (struct lwp_info *lp, void *data) | |
2435 | { | |
2436 | /* Only report a pending wait status if we pretend that this has | |
2437 | indeed been resumed. */ | |
d90e17a7 PA |
2438 | /* We check for lp->waitstatus in addition to lp->status, because we |
2439 | can have pending process exits recorded in lp->waitstatus, and | |
2440 | W_EXITCODE(0,0) == 0. */ | |
2441 | return ((lp->status != 0 | |
2442 | || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2443 | && lp->resumed); | |
d6b0e80f AC |
2444 | } |
2445 | ||
2446 | /* Return non-zero if LP isn't stopped. */ | |
2447 | ||
2448 | static int | |
2449 | running_callback (struct lwp_info *lp, void *data) | |
2450 | { | |
2451 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2452 | } | |
2453 | ||
2454 | /* Count the LWP's that have had events. */ | |
2455 | ||
2456 | static int | |
2457 | count_events_callback (struct lwp_info *lp, void *data) | |
2458 | { | |
2459 | int *count = data; | |
2460 | ||
2461 | gdb_assert (count != NULL); | |
2462 | ||
e09490f1 DJ |
2463 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
2464 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2465 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2466 | (*count)++; | |
2467 | ||
2468 | return 0; | |
2469 | } | |
2470 | ||
2471 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2472 | ||
2473 | static int | |
2474 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2475 | { | |
2476 | if (lp->step && lp->status != 0) | |
2477 | return 1; | |
2478 | else | |
2479 | return 0; | |
2480 | } | |
2481 | ||
2482 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2483 | ||
2484 | static int | |
2485 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2486 | { | |
2487 | int *selector = data; | |
2488 | ||
2489 | gdb_assert (selector != NULL); | |
2490 | ||
e09490f1 DJ |
2491 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
2492 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2493 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2494 | if ((*selector)-- == 0) | |
2495 | return 1; | |
2496 | ||
2497 | return 0; | |
2498 | } | |
2499 | ||
710151dd PA |
2500 | static int |
2501 | cancel_breakpoint (struct lwp_info *lp) | |
2502 | { | |
2503 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2504 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2505 | LWP. We will handle the current event, eventually we will resume | |
2506 | this LWP, and this breakpoint will trap again. | |
2507 | ||
2508 | If we do not do this, then we run the risk that the user will | |
2509 | delete or disable the breakpoint, but the LWP will have already | |
2510 | tripped on it. */ | |
2511 | ||
515630c5 UW |
2512 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2513 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2514 | CORE_ADDR pc; | |
2515 | ||
2516 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
2517 | if (breakpoint_inserted_here_p (pc)) | |
710151dd PA |
2518 | { |
2519 | if (debug_linux_nat) | |
2520 | fprintf_unfiltered (gdb_stdlog, | |
2521 | "CB: Push back breakpoint for %s\n", | |
2522 | target_pid_to_str (lp->ptid)); | |
2523 | ||
2524 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2525 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2526 | regcache_write_pc (regcache, pc); | |
2527 | ||
710151dd PA |
2528 | return 1; |
2529 | } | |
2530 | return 0; | |
2531 | } | |
2532 | ||
d6b0e80f AC |
2533 | static int |
2534 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2535 | { | |
2536 | struct lwp_info *event_lp = data; | |
2537 | ||
2538 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2539 | if (lp == event_lp) | |
2540 | return 0; | |
2541 | ||
2542 | /* If a LWP other than the LWP that we're reporting an event for has | |
2543 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2544 | then just arrange for it to hit it again later. We don't keep | |
2545 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2546 | LWP. We will handle the current event, eventually we will resume | |
2547 | all LWPs, and this one will get its breakpoint trap again. | |
2548 | ||
2549 | If we do not do this, then we run the risk that the user will | |
2550 | delete or disable the breakpoint, but the LWP will have already | |
2551 | tripped on it. */ | |
2552 | ||
2553 | if (lp->status != 0 | |
2554 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP | |
710151dd PA |
2555 | && cancel_breakpoint (lp)) |
2556 | /* Throw away the SIGTRAP. */ | |
2557 | lp->status = 0; | |
d6b0e80f AC |
2558 | |
2559 | return 0; | |
2560 | } | |
2561 | ||
2562 | /* Select one LWP out of those that have events pending. */ | |
2563 | ||
2564 | static void | |
d90e17a7 | 2565 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
2566 | { |
2567 | int num_events = 0; | |
2568 | int random_selector; | |
2569 | struct lwp_info *event_lp; | |
2570 | ||
ac264b3b | 2571 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2572 | (*orig_lp)->status = *status; |
2573 | ||
2574 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
2575 | event_lp = iterate_over_lwps (filter, |
2576 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
2577 | if (event_lp != NULL) |
2578 | { | |
2579 | if (debug_linux_nat) | |
2580 | fprintf_unfiltered (gdb_stdlog, | |
2581 | "SEL: Select single-step %s\n", | |
2582 | target_pid_to_str (event_lp->ptid)); | |
2583 | } | |
2584 | else | |
2585 | { | |
2586 | /* No single-stepping LWP. Select one at random, out of those | |
2587 | which have had SIGTRAP events. */ | |
2588 | ||
2589 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 2590 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
2591 | |
2592 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2593 | random_selector = (int) | |
2594 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2595 | ||
2596 | if (debug_linux_nat && num_events > 1) | |
2597 | fprintf_unfiltered (gdb_stdlog, | |
2598 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2599 | num_events, random_selector); | |
2600 | ||
d90e17a7 PA |
2601 | event_lp = iterate_over_lwps (filter, |
2602 | select_event_lwp_callback, | |
d6b0e80f AC |
2603 | &random_selector); |
2604 | } | |
2605 | ||
2606 | if (event_lp != NULL) | |
2607 | { | |
2608 | /* Switch the event LWP. */ | |
2609 | *orig_lp = event_lp; | |
2610 | *status = event_lp->status; | |
2611 | } | |
2612 | ||
2613 | /* Flush the wait status for the event LWP. */ | |
2614 | (*orig_lp)->status = 0; | |
2615 | } | |
2616 | ||
2617 | /* Return non-zero if LP has been resumed. */ | |
2618 | ||
2619 | static int | |
2620 | resumed_callback (struct lwp_info *lp, void *data) | |
2621 | { | |
2622 | return lp->resumed; | |
2623 | } | |
2624 | ||
d6b0e80f AC |
2625 | /* Stop an active thread, verify it still exists, then resume it. */ |
2626 | ||
2627 | static int | |
2628 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
2629 | { | |
2630 | struct lwp_info *ptr; | |
2631 | ||
2632 | if (!lp->stopped && !lp->signalled) | |
2633 | { | |
2634 | stop_callback (lp, NULL); | |
2635 | stop_wait_callback (lp, NULL); | |
2636 | /* Resume if the lwp still exists. */ | |
2637 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
2638 | if (lp == ptr) | |
2639 | { | |
2640 | resume_callback (lp, NULL); | |
2641 | resume_set_callback (lp, NULL); | |
2642 | } | |
2643 | } | |
2644 | return 0; | |
2645 | } | |
2646 | ||
02f3fc28 | 2647 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 2648 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
2649 | static struct lwp_info * |
2650 | linux_nat_filter_event (int lwpid, int status, int options) | |
2651 | { | |
2652 | struct lwp_info *lp; | |
2653 | ||
2654 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2655 | ||
2656 | /* Check for stop events reported by a process we didn't already | |
2657 | know about - anything not already in our LWP list. | |
2658 | ||
2659 | If we're expecting to receive stopped processes after | |
2660 | fork, vfork, and clone events, then we'll just add the | |
2661 | new one to our list and go back to waiting for the event | |
2662 | to be reported - the stopped process might be returned | |
2663 | from waitpid before or after the event is. */ | |
2664 | if (WIFSTOPPED (status) && !lp) | |
2665 | { | |
2666 | linux_record_stopped_pid (lwpid, status); | |
2667 | return NULL; | |
2668 | } | |
2669 | ||
2670 | /* Make sure we don't report an event for the exit of an LWP not in | |
2671 | our list, i.e. not part of the current process. This can happen | |
2672 | if we detach from a program we original forked and then it | |
2673 | exits. */ | |
2674 | if (!WIFSTOPPED (status) && !lp) | |
2675 | return NULL; | |
2676 | ||
2677 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
2678 | CLONE_PTRACE processes which do not use the thread library - | |
2679 | otherwise we wouldn't find the new LWP this way. That doesn't | |
2680 | currently work, and the following code is currently unreachable | |
2681 | due to the two blocks above. If it's fixed some day, this code | |
2682 | should be broken out into a function so that we can also pick up | |
2683 | LWPs from the new interface. */ | |
2684 | if (!lp) | |
2685 | { | |
2686 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
2687 | if (options & __WCLONE) | |
2688 | lp->cloned = 1; | |
2689 | ||
2690 | gdb_assert (WIFSTOPPED (status) | |
2691 | && WSTOPSIG (status) == SIGSTOP); | |
2692 | lp->signalled = 1; | |
2693 | ||
2694 | if (!in_thread_list (inferior_ptid)) | |
2695 | { | |
2696 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
2697 | GET_PID (inferior_ptid)); | |
2698 | add_thread (inferior_ptid); | |
2699 | } | |
2700 | ||
2701 | add_thread (lp->ptid); | |
2702 | } | |
2703 | ||
2704 | /* Save the trap's siginfo in case we need it later. */ | |
a96d9b2e SDJ |
2705 | if (WIFSTOPPED (status) |
2706 | && (WSTOPSIG (status) == SIGTRAP || WSTOPSIG (status) == TRAP_IS_SYSCALL)) | |
02f3fc28 PA |
2707 | save_siginfo (lp); |
2708 | ||
a96d9b2e SDJ |
2709 | /* Handle GNU/Linux's extended waitstatus for trace events. |
2710 | It is necessary to check if WSTOPSIG is signaling that | |
2711 | the inferior is entering/exiting a system call. */ | |
2712 | if (WIFSTOPPED (status) | |
2713 | && ((WSTOPSIG (status) == TRAP_IS_SYSCALL) | |
2714 | || (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0))) | |
02f3fc28 PA |
2715 | { |
2716 | if (debug_linux_nat) | |
2717 | fprintf_unfiltered (gdb_stdlog, | |
2718 | "LLW: Handling extended status 0x%06x\n", | |
2719 | status); | |
2720 | if (linux_handle_extended_wait (lp, status, 0)) | |
2721 | return NULL; | |
2722 | } | |
2723 | ||
2724 | /* Check if the thread has exited. */ | |
d90e17a7 PA |
2725 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
2726 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 2727 | { |
9db03742 JB |
2728 | /* If this is the main thread, we must stop all threads and verify |
2729 | if they are still alive. This is because in the nptl thread model | |
2730 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
2731 | other than the main thread. We only get the main thread exit |
2732 | signal once all child threads have already exited. If we | |
2733 | stop all the threads and use the stop_wait_callback to check | |
2734 | if they have exited we can determine whether this signal | |
2735 | should be ignored or whether it means the end of the debugged | |
2736 | application, regardless of which threading model is being | |
5d3b6af6 | 2737 | used. */ |
02f3fc28 PA |
2738 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
2739 | { | |
2740 | lp->stopped = 1; | |
d90e17a7 PA |
2741 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
2742 | stop_and_resume_callback, NULL); | |
02f3fc28 PA |
2743 | } |
2744 | ||
2745 | if (debug_linux_nat) | |
2746 | fprintf_unfiltered (gdb_stdlog, | |
2747 | "LLW: %s exited.\n", | |
2748 | target_pid_to_str (lp->ptid)); | |
2749 | ||
d90e17a7 | 2750 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
2751 | { |
2752 | /* If there is at least one more LWP, then the exit signal | |
2753 | was not the end of the debugged application and should be | |
2754 | ignored. */ | |
2755 | exit_lwp (lp); | |
2756 | return NULL; | |
2757 | } | |
02f3fc28 PA |
2758 | } |
2759 | ||
2760 | /* Check if the current LWP has previously exited. In the nptl | |
2761 | thread model, LWPs other than the main thread do not issue | |
2762 | signals when they exit so we must check whenever the thread has | |
2763 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 2764 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 2765 | { |
d90e17a7 PA |
2766 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
2767 | ||
02f3fc28 PA |
2768 | if (debug_linux_nat) |
2769 | fprintf_unfiltered (gdb_stdlog, | |
2770 | "LLW: %s exited.\n", | |
2771 | target_pid_to_str (lp->ptid)); | |
2772 | ||
2773 | exit_lwp (lp); | |
2774 | ||
2775 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 2776 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
2777 | |
2778 | /* Discard the event. */ | |
2779 | return NULL; | |
2780 | } | |
2781 | ||
2782 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
2783 | an attempt to stop an LWP. */ | |
2784 | if (lp->signalled | |
2785 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
2786 | { | |
2787 | if (debug_linux_nat) | |
2788 | fprintf_unfiltered (gdb_stdlog, | |
2789 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
2790 | target_pid_to_str (lp->ptid)); | |
2791 | ||
2792 | /* This is a delayed SIGSTOP. */ | |
2793 | lp->signalled = 0; | |
2794 | ||
2795 | registers_changed (); | |
2796 | ||
28439f5e | 2797 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
02f3fc28 PA |
2798 | lp->step, TARGET_SIGNAL_0); |
2799 | if (debug_linux_nat) | |
2800 | fprintf_unfiltered (gdb_stdlog, | |
2801 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
2802 | lp->step ? | |
2803 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2804 | target_pid_to_str (lp->ptid)); | |
2805 | ||
2806 | lp->stopped = 0; | |
2807 | gdb_assert (lp->resumed); | |
2808 | ||
2809 | /* Discard the event. */ | |
2810 | return NULL; | |
2811 | } | |
2812 | ||
57380f4e DJ |
2813 | /* Make sure we don't report a SIGINT that we have already displayed |
2814 | for another thread. */ | |
2815 | if (lp->ignore_sigint | |
2816 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
2817 | { | |
2818 | if (debug_linux_nat) | |
2819 | fprintf_unfiltered (gdb_stdlog, | |
2820 | "LLW: Delayed SIGINT caught for %s.\n", | |
2821 | target_pid_to_str (lp->ptid)); | |
2822 | ||
2823 | /* This is a delayed SIGINT. */ | |
2824 | lp->ignore_sigint = 0; | |
2825 | ||
2826 | registers_changed (); | |
28439f5e | 2827 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
2828 | lp->step, TARGET_SIGNAL_0); |
2829 | if (debug_linux_nat) | |
2830 | fprintf_unfiltered (gdb_stdlog, | |
2831 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
2832 | lp->step ? | |
2833 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2834 | target_pid_to_str (lp->ptid)); | |
2835 | ||
2836 | lp->stopped = 0; | |
2837 | gdb_assert (lp->resumed); | |
2838 | ||
2839 | /* Discard the event. */ | |
2840 | return NULL; | |
2841 | } | |
2842 | ||
02f3fc28 PA |
2843 | /* An interesting event. */ |
2844 | gdb_assert (lp); | |
2845 | return lp; | |
2846 | } | |
2847 | ||
d6b0e80f | 2848 | static ptid_t |
7feb7d06 | 2849 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
2850 | ptid_t ptid, struct target_waitstatus *ourstatus, |
2851 | int target_options) | |
d6b0e80f | 2852 | { |
7feb7d06 | 2853 | static sigset_t prev_mask; |
d6b0e80f AC |
2854 | struct lwp_info *lp = NULL; |
2855 | int options = 0; | |
2856 | int status = 0; | |
d90e17a7 | 2857 | pid_t pid; |
d6b0e80f | 2858 | |
b84876c2 PA |
2859 | if (debug_linux_nat_async) |
2860 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); | |
2861 | ||
f973ed9c DJ |
2862 | /* The first time we get here after starting a new inferior, we may |
2863 | not have added it to the LWP list yet - this is the earliest | |
2864 | moment at which we know its PID. */ | |
d90e17a7 | 2865 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 2866 | { |
27c9d204 PA |
2867 | /* Upgrade the main thread's ptid. */ |
2868 | thread_change_ptid (inferior_ptid, | |
2869 | BUILD_LWP (GET_PID (inferior_ptid), | |
2870 | GET_PID (inferior_ptid))); | |
2871 | ||
f973ed9c DJ |
2872 | lp = add_lwp (inferior_ptid); |
2873 | lp->resumed = 1; | |
2874 | } | |
2875 | ||
7feb7d06 PA |
2876 | /* Make sure SIGCHLD is blocked. */ |
2877 | block_child_signals (&prev_mask); | |
d6b0e80f | 2878 | |
d90e17a7 PA |
2879 | if (ptid_equal (ptid, minus_one_ptid)) |
2880 | pid = -1; | |
2881 | else if (ptid_is_pid (ptid)) | |
2882 | /* A request to wait for a specific tgid. This is not possible | |
2883 | with waitpid, so instead, we wait for any child, and leave | |
2884 | children we're not interested in right now with a pending | |
2885 | status to report later. */ | |
2886 | pid = -1; | |
2887 | else | |
2888 | pid = GET_LWP (ptid); | |
2889 | ||
d6b0e80f | 2890 | retry: |
d90e17a7 PA |
2891 | lp = NULL; |
2892 | status = 0; | |
d6b0e80f | 2893 | |
f973ed9c | 2894 | /* Make sure there is at least one LWP that has been resumed. */ |
d90e17a7 | 2895 | gdb_assert (iterate_over_lwps (ptid, resumed_callback, NULL)); |
d6b0e80f AC |
2896 | |
2897 | /* First check if there is a LWP with a wait status pending. */ | |
2898 | if (pid == -1) | |
2899 | { | |
2900 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 2901 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
2902 | if (lp) |
2903 | { | |
2904 | status = lp->status; | |
2905 | lp->status = 0; | |
2906 | ||
2907 | if (debug_linux_nat && status) | |
2908 | fprintf_unfiltered (gdb_stdlog, | |
2909 | "LLW: Using pending wait status %s for %s.\n", | |
2910 | status_to_str (status), | |
2911 | target_pid_to_str (lp->ptid)); | |
2912 | } | |
2913 | ||
b84876c2 | 2914 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
2915 | cloned and uncloned processes. We start with the cloned |
2916 | processes. */ | |
d6b0e80f AC |
2917 | options = __WCLONE | WNOHANG; |
2918 | } | |
2919 | else if (is_lwp (ptid)) | |
2920 | { | |
2921 | if (debug_linux_nat) | |
2922 | fprintf_unfiltered (gdb_stdlog, | |
2923 | "LLW: Waiting for specific LWP %s.\n", | |
2924 | target_pid_to_str (ptid)); | |
2925 | ||
2926 | /* We have a specific LWP to check. */ | |
2927 | lp = find_lwp_pid (ptid); | |
2928 | gdb_assert (lp); | |
2929 | status = lp->status; | |
2930 | lp->status = 0; | |
2931 | ||
2932 | if (debug_linux_nat && status) | |
2933 | fprintf_unfiltered (gdb_stdlog, | |
2934 | "LLW: Using pending wait status %s for %s.\n", | |
2935 | status_to_str (status), | |
2936 | target_pid_to_str (lp->ptid)); | |
2937 | ||
2938 | /* If we have to wait, take into account whether PID is a cloned | |
2939 | process or not. And we have to convert it to something that | |
2940 | the layer beneath us can understand. */ | |
2941 | options = lp->cloned ? __WCLONE : 0; | |
2942 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
2943 | |
2944 | /* We check for lp->waitstatus in addition to lp->status, | |
2945 | because we can have pending process exits recorded in | |
2946 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
2947 | an additional lp->status_p flag. */ | |
2948 | if (status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
2949 | lp = NULL; | |
d6b0e80f AC |
2950 | } |
2951 | ||
d90e17a7 | 2952 | if (lp && lp->signalled) |
d6b0e80f AC |
2953 | { |
2954 | /* A pending SIGSTOP may interfere with the normal stream of | |
2955 | events. In a typical case where interference is a problem, | |
2956 | we have a SIGSTOP signal pending for LWP A while | |
2957 | single-stepping it, encounter an event in LWP B, and take the | |
2958 | pending SIGSTOP while trying to stop LWP A. After processing | |
2959 | the event in LWP B, LWP A is continued, and we'll never see | |
2960 | the SIGTRAP associated with the last time we were | |
2961 | single-stepping LWP A. */ | |
2962 | ||
2963 | /* Resume the thread. It should halt immediately returning the | |
2964 | pending SIGSTOP. */ | |
2965 | registers_changed (); | |
28439f5e | 2966 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 2967 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
2968 | if (debug_linux_nat) |
2969 | fprintf_unfiltered (gdb_stdlog, | |
2970 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
2971 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2972 | target_pid_to_str (lp->ptid)); | |
2973 | lp->stopped = 0; | |
2974 | gdb_assert (lp->resumed); | |
2975 | ||
2976 | /* This should catch the pending SIGSTOP. */ | |
2977 | stop_wait_callback (lp, NULL); | |
2978 | } | |
2979 | ||
b84876c2 PA |
2980 | if (!target_can_async_p ()) |
2981 | { | |
2982 | /* Causes SIGINT to be passed on to the attached process. */ | |
2983 | set_sigint_trap (); | |
b84876c2 | 2984 | } |
d6b0e80f | 2985 | |
47608cb1 PA |
2986 | /* Translate generic target_wait options into waitpid options. */ |
2987 | if (target_options & TARGET_WNOHANG) | |
2988 | options |= WNOHANG; | |
7feb7d06 | 2989 | |
d90e17a7 | 2990 | while (lp == NULL) |
d6b0e80f AC |
2991 | { |
2992 | pid_t lwpid; | |
2993 | ||
7feb7d06 | 2994 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 2995 | |
d6b0e80f AC |
2996 | if (lwpid > 0) |
2997 | { | |
2998 | gdb_assert (pid == -1 || lwpid == pid); | |
2999 | ||
3000 | if (debug_linux_nat) | |
3001 | { | |
3002 | fprintf_unfiltered (gdb_stdlog, | |
3003 | "LLW: waitpid %ld received %s\n", | |
3004 | (long) lwpid, status_to_str (status)); | |
3005 | } | |
3006 | ||
02f3fc28 | 3007 | lp = linux_nat_filter_event (lwpid, status, options); |
d90e17a7 PA |
3008 | |
3009 | if (lp | |
3010 | && ptid_is_pid (ptid) | |
3011 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 3012 | { |
d90e17a7 PA |
3013 | if (debug_linux_nat) |
3014 | fprintf (stderr, "LWP %ld got an event %06x, leaving pending.\n", | |
3015 | ptid_get_lwp (lp->ptid), status); | |
3016 | ||
3017 | if (WIFSTOPPED (status)) | |
3018 | { | |
3019 | if (WSTOPSIG (status) != SIGSTOP) | |
3020 | { | |
3021 | lp->status = status; | |
3022 | ||
3023 | stop_callback (lp, NULL); | |
3024 | ||
3025 | /* Resume in order to collect the sigstop. */ | |
3026 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
3027 | ||
3028 | stop_wait_callback (lp, NULL); | |
3029 | } | |
3030 | else | |
3031 | { | |
3032 | lp->stopped = 1; | |
3033 | lp->signalled = 0; | |
3034 | } | |
3035 | } | |
3036 | else if (WIFEXITED (status) || WIFSIGNALED (status)) | |
3037 | { | |
3038 | if (debug_linux_nat) | |
3039 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
3040 | ptid_get_lwp (lp->ptid)); | |
3041 | ||
3042 | /* This was the last lwp in the process. Since | |
3043 | events are serialized to GDB core, and we can't | |
3044 | report this one right now, but GDB core and the | |
3045 | other target layers will want to be notified | |
3046 | about the exit code/signal, leave the status | |
3047 | pending for the next time we're able to report | |
3048 | it. */ | |
3049 | lp->status = status; | |
3050 | ||
3051 | /* Prevent trying to stop this thread again. We'll | |
3052 | never try to resume it because it has a pending | |
3053 | status. */ | |
3054 | lp->stopped = 1; | |
3055 | ||
3056 | /* Dead LWP's aren't expected to reported a pending | |
3057 | sigstop. */ | |
3058 | lp->signalled = 0; | |
3059 | ||
3060 | /* Store the pending event in the waitstatus as | |
3061 | well, because W_EXITCODE(0,0) == 0. */ | |
3062 | store_waitstatus (&lp->waitstatus, status); | |
3063 | } | |
3064 | ||
3065 | /* Keep looking. */ | |
3066 | lp = NULL; | |
d6b0e80f AC |
3067 | continue; |
3068 | } | |
3069 | ||
d90e17a7 PA |
3070 | if (lp) |
3071 | break; | |
3072 | else | |
3073 | { | |
3074 | if (pid == -1) | |
3075 | { | |
3076 | /* waitpid did return something. Restart over. */ | |
3077 | options |= __WCLONE; | |
3078 | } | |
3079 | continue; | |
3080 | } | |
d6b0e80f AC |
3081 | } |
3082 | ||
3083 | if (pid == -1) | |
3084 | { | |
3085 | /* Alternate between checking cloned and uncloned processes. */ | |
3086 | options ^= __WCLONE; | |
3087 | ||
b84876c2 PA |
3088 | /* And every time we have checked both: |
3089 | In async mode, return to event loop; | |
3090 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 3091 | if (options & __WCLONE) |
b84876c2 | 3092 | { |
47608cb1 | 3093 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
3094 | { |
3095 | /* No interesting event. */ | |
3096 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3097 | ||
b84876c2 PA |
3098 | if (debug_linux_nat_async) |
3099 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3100 | ||
7feb7d06 | 3101 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
3102 | return minus_one_ptid; |
3103 | } | |
3104 | ||
3105 | sigsuspend (&suspend_mask); | |
3106 | } | |
d6b0e80f AC |
3107 | } |
3108 | ||
3109 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3110 | gdb_assert (lp == NULL); |
d6b0e80f AC |
3111 | } |
3112 | ||
b84876c2 | 3113 | if (!target_can_async_p ()) |
d26b5354 | 3114 | clear_sigint_trap (); |
d6b0e80f AC |
3115 | |
3116 | gdb_assert (lp); | |
3117 | ||
3118 | /* Don't report signals that GDB isn't interested in, such as | |
3119 | signals that are neither printed nor stopped upon. Stopping all | |
3120 | threads can be a bit time-consuming so if we want decent | |
3121 | performance with heavily multi-threaded programs, especially when | |
3122 | they're using a high frequency timer, we'd better avoid it if we | |
3123 | can. */ | |
3124 | ||
3125 | if (WIFSTOPPED (status)) | |
3126 | { | |
3127 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
d6b48e9c PA |
3128 | struct inferior *inf; |
3129 | ||
3130 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
3131 | gdb_assert (inf); | |
d6b0e80f | 3132 | |
d6b48e9c PA |
3133 | /* Defer to common code if we get a signal while |
3134 | single-stepping, since that may need special care, e.g. to | |
3135 | skip the signal handler, or, if we're gaining control of the | |
3136 | inferior. */ | |
d539ed7e | 3137 | if (!lp->step |
d6b48e9c | 3138 | && inf->stop_soon == NO_STOP_QUIETLY |
d539ed7e | 3139 | && signal_stop_state (signo) == 0 |
d6b0e80f AC |
3140 | && signal_print_state (signo) == 0 |
3141 | && signal_pass_state (signo) == 1) | |
3142 | { | |
3143 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3144 | here? It is not clear we should. GDB may not expect | |
3145 | other threads to run. On the other hand, not resuming | |
3146 | newly attached threads may cause an unwanted delay in | |
3147 | getting them running. */ | |
3148 | registers_changed (); | |
28439f5e | 3149 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3150 | lp->step, signo); |
d6b0e80f AC |
3151 | if (debug_linux_nat) |
3152 | fprintf_unfiltered (gdb_stdlog, | |
3153 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3154 | lp->step ? | |
3155 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3156 | target_pid_to_str (lp->ptid), | |
3157 | signo ? strsignal (signo) : "0"); | |
3158 | lp->stopped = 0; | |
d6b0e80f AC |
3159 | goto retry; |
3160 | } | |
3161 | ||
1ad15515 | 3162 | if (!non_stop) |
d6b0e80f | 3163 | { |
1ad15515 PA |
3164 | /* Only do the below in all-stop, as we currently use SIGINT |
3165 | to implement target_stop (see linux_nat_stop) in | |
3166 | non-stop. */ | |
3167 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3168 | { | |
3169 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3170 | forwarded to the entire process group, that is, all LWPs | |
3171 | will receive it - unless they're using CLONE_THREAD to | |
3172 | share signals. Since we only want to report it once, we | |
3173 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3174 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3175 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3176 | lp->ignore_sigint = 0; |
3177 | } | |
3178 | else | |
3179 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3180 | } |
3181 | } | |
3182 | ||
3183 | /* This LWP is stopped now. */ | |
3184 | lp->stopped = 1; | |
3185 | ||
3186 | if (debug_linux_nat) | |
3187 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3188 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3189 | ||
4c28f408 PA |
3190 | if (!non_stop) |
3191 | { | |
3192 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3193 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3194 | |
3195 | /* ... and wait until all of them have reported back that | |
3196 | they're no longer running. */ | |
d90e17a7 | 3197 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3198 | |
3199 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3200 | from among those that have had events. Giving equal priority | |
3201 | to all LWPs that have had events helps prevent | |
3202 | starvation. */ | |
3203 | if (pid == -1) | |
d90e17a7 | 3204 | select_event_lwp (ptid, &lp, &status); |
4c28f408 | 3205 | } |
d6b0e80f AC |
3206 | |
3207 | /* Now that we've selected our final event LWP, cancel any | |
3208 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
3209 | the comment in cancel_breakpoints_callback to find out why. */ | |
d90e17a7 | 3210 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); |
d6b0e80f | 3211 | |
d6b0e80f AC |
3212 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) |
3213 | { | |
d6b0e80f AC |
3214 | if (debug_linux_nat) |
3215 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3216 | "LLW: trap ptid is %s.\n", |
3217 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3218 | } |
d6b0e80f AC |
3219 | |
3220 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3221 | { | |
3222 | *ourstatus = lp->waitstatus; | |
3223 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3224 | } | |
3225 | else | |
3226 | store_waitstatus (ourstatus, status); | |
3227 | ||
b84876c2 PA |
3228 | if (debug_linux_nat_async) |
3229 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); | |
3230 | ||
7feb7d06 | 3231 | restore_child_signals_mask (&prev_mask); |
f973ed9c | 3232 | return lp->ptid; |
d6b0e80f AC |
3233 | } |
3234 | ||
7feb7d06 PA |
3235 | static ptid_t |
3236 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3237 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3238 | int target_options) | |
7feb7d06 PA |
3239 | { |
3240 | ptid_t event_ptid; | |
3241 | ||
3242 | if (debug_linux_nat) | |
3243 | fprintf_unfiltered (gdb_stdlog, "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
3244 | ||
3245 | /* Flush the async file first. */ | |
3246 | if (target_can_async_p ()) | |
3247 | async_file_flush (); | |
3248 | ||
47608cb1 | 3249 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3250 | |
3251 | /* If we requested any event, and something came out, assume there | |
3252 | may be more. If we requested a specific lwp or process, also | |
3253 | assume there may be more. */ | |
3254 | if (target_can_async_p () | |
3255 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3256 | || !ptid_equal (ptid, minus_one_ptid))) | |
3257 | async_file_mark (); | |
3258 | ||
3259 | /* Get ready for the next event. */ | |
3260 | if (target_can_async_p ()) | |
3261 | target_async (inferior_event_handler, 0); | |
3262 | ||
3263 | return event_ptid; | |
3264 | } | |
3265 | ||
d6b0e80f AC |
3266 | static int |
3267 | kill_callback (struct lwp_info *lp, void *data) | |
3268 | { | |
3269 | errno = 0; | |
3270 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3271 | if (debug_linux_nat) | |
3272 | fprintf_unfiltered (gdb_stdlog, | |
3273 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3274 | target_pid_to_str (lp->ptid), | |
3275 | errno ? safe_strerror (errno) : "OK"); | |
3276 | ||
3277 | return 0; | |
3278 | } | |
3279 | ||
3280 | static int | |
3281 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3282 | { | |
3283 | pid_t pid; | |
3284 | ||
3285 | /* We must make sure that there are no pending events (delayed | |
3286 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3287 | program doesn't interfere with any following debugging session. */ | |
3288 | ||
3289 | /* For cloned processes we must check both with __WCLONE and | |
3290 | without, since the exit status of a cloned process isn't reported | |
3291 | with __WCLONE. */ | |
3292 | if (lp->cloned) | |
3293 | { | |
3294 | do | |
3295 | { | |
58aecb61 | 3296 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3297 | if (pid != (pid_t) -1) |
d6b0e80f | 3298 | { |
e85a822c DJ |
3299 | if (debug_linux_nat) |
3300 | fprintf_unfiltered (gdb_stdlog, | |
3301 | "KWC: wait %s received unknown.\n", | |
3302 | target_pid_to_str (lp->ptid)); | |
3303 | /* The Linux kernel sometimes fails to kill a thread | |
3304 | completely after PTRACE_KILL; that goes from the stop | |
3305 | point in do_fork out to the one in | |
3306 | get_signal_to_deliever and waits again. So kill it | |
3307 | again. */ | |
3308 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3309 | } |
3310 | } | |
3311 | while (pid == GET_LWP (lp->ptid)); | |
3312 | ||
3313 | gdb_assert (pid == -1 && errno == ECHILD); | |
3314 | } | |
3315 | ||
3316 | do | |
3317 | { | |
58aecb61 | 3318 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3319 | if (pid != (pid_t) -1) |
d6b0e80f | 3320 | { |
e85a822c DJ |
3321 | if (debug_linux_nat) |
3322 | fprintf_unfiltered (gdb_stdlog, | |
3323 | "KWC: wait %s received unk.\n", | |
3324 | target_pid_to_str (lp->ptid)); | |
3325 | /* See the call to kill_callback above. */ | |
3326 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3327 | } |
3328 | } | |
3329 | while (pid == GET_LWP (lp->ptid)); | |
3330 | ||
3331 | gdb_assert (pid == -1 && errno == ECHILD); | |
3332 | return 0; | |
3333 | } | |
3334 | ||
3335 | static void | |
7d85a9c0 | 3336 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3337 | { |
f973ed9c DJ |
3338 | struct target_waitstatus last; |
3339 | ptid_t last_ptid; | |
3340 | int status; | |
d6b0e80f | 3341 | |
f973ed9c DJ |
3342 | /* If we're stopped while forking and we haven't followed yet, |
3343 | kill the other task. We need to do this first because the | |
3344 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3345 | |
f973ed9c | 3346 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3347 | |
f973ed9c DJ |
3348 | if (last.kind == TARGET_WAITKIND_FORKED |
3349 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3350 | { | |
3a3e9ee3 | 3351 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3352 | wait (&status); |
3353 | } | |
3354 | ||
3355 | if (forks_exist_p ()) | |
7feb7d06 | 3356 | linux_fork_killall (); |
f973ed9c DJ |
3357 | else |
3358 | { | |
d90e17a7 | 3359 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
4c28f408 PA |
3360 | /* Stop all threads before killing them, since ptrace requires |
3361 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3362 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3363 | /* ... and wait until all of them have reported back that |
3364 | they're no longer running. */ | |
d90e17a7 | 3365 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3366 | |
f973ed9c | 3367 | /* Kill all LWP's ... */ |
d90e17a7 | 3368 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3369 | |
3370 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3371 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3372 | } |
3373 | ||
3374 | target_mourn_inferior (); | |
d6b0e80f AC |
3375 | } |
3376 | ||
3377 | static void | |
136d6dae | 3378 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3379 | { |
d90e17a7 | 3380 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 3381 | |
f973ed9c | 3382 | if (! forks_exist_p ()) |
d90e17a7 PA |
3383 | /* Normal case, no other forks available. */ |
3384 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3385 | else |
3386 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3387 | there are other viable forks to debug. Delete the exiting | |
3388 | one and context-switch to the first available. */ | |
3389 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3390 | } |
3391 | ||
5b009018 PA |
3392 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3393 | layout of the inferiors' architecture. */ | |
3394 | ||
3395 | static void | |
3396 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
3397 | { | |
3398 | int done = 0; | |
3399 | ||
3400 | if (linux_nat_siginfo_fixup != NULL) | |
3401 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3402 | ||
3403 | /* If there was no callback, or the callback didn't do anything, | |
3404 | then just do a straight memcpy. */ | |
3405 | if (!done) | |
3406 | { | |
3407 | if (direction == 1) | |
3408 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3409 | else | |
3410 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3411 | } | |
3412 | } | |
3413 | ||
4aa995e1 PA |
3414 | static LONGEST |
3415 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
3416 | const char *annex, gdb_byte *readbuf, | |
3417 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3418 | { | |
4aa995e1 PA |
3419 | int pid; |
3420 | struct siginfo siginfo; | |
5b009018 | 3421 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3422 | |
3423 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3424 | gdb_assert (readbuf || writebuf); | |
3425 | ||
3426 | pid = GET_LWP (inferior_ptid); | |
3427 | if (pid == 0) | |
3428 | pid = GET_PID (inferior_ptid); | |
3429 | ||
3430 | if (offset > sizeof (siginfo)) | |
3431 | return -1; | |
3432 | ||
3433 | errno = 0; | |
3434 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3435 | if (errno != 0) | |
3436 | return -1; | |
3437 | ||
5b009018 PA |
3438 | /* When GDB is built as a 64-bit application, ptrace writes into |
3439 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3440 | inferior with a 64-bit GDB should look the same as debugging it | |
3441 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3442 | the converted layout, so any read/write will have to be done | |
3443 | post-conversion. */ | |
3444 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3445 | ||
4aa995e1 PA |
3446 | if (offset + len > sizeof (siginfo)) |
3447 | len = sizeof (siginfo) - offset; | |
3448 | ||
3449 | if (readbuf != NULL) | |
5b009018 | 3450 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3451 | else |
3452 | { | |
5b009018 PA |
3453 | memcpy (inf_siginfo + offset, writebuf, len); |
3454 | ||
3455 | /* Convert back to ptrace layout before flushing it out. */ | |
3456 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3457 | ||
4aa995e1 PA |
3458 | errno = 0; |
3459 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3460 | if (errno != 0) | |
3461 | return -1; | |
3462 | } | |
3463 | ||
3464 | return len; | |
3465 | } | |
3466 | ||
10d6c8cd DJ |
3467 | static LONGEST |
3468 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
3469 | const char *annex, gdb_byte *readbuf, | |
3470 | const gdb_byte *writebuf, | |
3471 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 3472 | { |
4aa995e1 | 3473 | struct cleanup *old_chain; |
10d6c8cd | 3474 | LONGEST xfer; |
d6b0e80f | 3475 | |
4aa995e1 PA |
3476 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3477 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
3478 | offset, len); | |
3479 | ||
c35b1492 PA |
3480 | /* The target is connected but no live inferior is selected. Pass |
3481 | this request down to a lower stratum (e.g., the executable | |
3482 | file). */ | |
3483 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
3484 | return 0; | |
3485 | ||
4aa995e1 PA |
3486 | old_chain = save_inferior_ptid (); |
3487 | ||
d6b0e80f AC |
3488 | if (is_lwp (inferior_ptid)) |
3489 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
3490 | ||
10d6c8cd DJ |
3491 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
3492 | offset, len); | |
d6b0e80f AC |
3493 | |
3494 | do_cleanups (old_chain); | |
3495 | return xfer; | |
3496 | } | |
3497 | ||
3498 | static int | |
28439f5e | 3499 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 3500 | { |
4c28f408 PA |
3501 | int err; |
3502 | ||
d6b0e80f AC |
3503 | gdb_assert (is_lwp (ptid)); |
3504 | ||
4c28f408 PA |
3505 | /* Send signal 0 instead of anything ptrace, because ptracing a |
3506 | running thread errors out claiming that the thread doesn't | |
3507 | exist. */ | |
3508 | err = kill_lwp (GET_LWP (ptid), 0); | |
3509 | ||
d6b0e80f AC |
3510 | if (debug_linux_nat) |
3511 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 3512 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 3513 | target_pid_to_str (ptid), |
4c28f408 | 3514 | err ? safe_strerror (err) : "OK"); |
9c0dd46b | 3515 | |
4c28f408 | 3516 | if (err != 0) |
d6b0e80f AC |
3517 | return 0; |
3518 | ||
3519 | return 1; | |
3520 | } | |
3521 | ||
28439f5e PA |
3522 | static int |
3523 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
3524 | { | |
3525 | return linux_thread_alive (ptid); | |
3526 | } | |
3527 | ||
d6b0e80f | 3528 | static char * |
117de6a9 | 3529 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
3530 | { |
3531 | static char buf[64]; | |
3532 | ||
a0ef4274 | 3533 | if (is_lwp (ptid) |
d90e17a7 PA |
3534 | && (GET_PID (ptid) != GET_LWP (ptid) |
3535 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
3536 | { |
3537 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
3538 | return buf; | |
3539 | } | |
3540 | ||
3541 | return normal_pid_to_str (ptid); | |
3542 | } | |
3543 | ||
dba24537 AC |
3544 | /* Accepts an integer PID; Returns a string representing a file that |
3545 | can be opened to get the symbols for the child process. */ | |
3546 | ||
6d8fd2b7 UW |
3547 | static char * |
3548 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
3549 | { |
3550 | char *name1, *name2; | |
3551 | ||
3552 | name1 = xmalloc (MAXPATHLEN); | |
3553 | name2 = xmalloc (MAXPATHLEN); | |
3554 | make_cleanup (xfree, name1); | |
3555 | make_cleanup (xfree, name2); | |
3556 | memset (name2, 0, MAXPATHLEN); | |
3557 | ||
3558 | sprintf (name1, "/proc/%d/exe", pid); | |
3559 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
3560 | return name2; | |
3561 | else | |
3562 | return name1; | |
3563 | } | |
3564 | ||
3565 | /* Service function for corefiles and info proc. */ | |
3566 | ||
3567 | static int | |
3568 | read_mapping (FILE *mapfile, | |
3569 | long long *addr, | |
3570 | long long *endaddr, | |
3571 | char *permissions, | |
3572 | long long *offset, | |
3573 | char *device, long long *inode, char *filename) | |
3574 | { | |
3575 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
3576 | addr, endaddr, permissions, offset, device, inode); | |
3577 | ||
2e14c2ea MS |
3578 | filename[0] = '\0'; |
3579 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
3580 | { |
3581 | /* Eat everything up to EOL for the filename. This will prevent | |
3582 | weird filenames (such as one with embedded whitespace) from | |
3583 | confusing this code. It also makes this code more robust in | |
3584 | respect to annotations the kernel may add after the filename. | |
3585 | ||
3586 | Note the filename is used for informational purposes | |
3587 | only. */ | |
3588 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
3589 | } | |
2e14c2ea | 3590 | |
dba24537 AC |
3591 | return (ret != 0 && ret != EOF); |
3592 | } | |
3593 | ||
3594 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
3595 | regions in the inferior for a corefile. */ | |
3596 | ||
3597 | static int | |
3598 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
3599 | unsigned long, | |
3600 | int, int, int, void *), void *obfd) | |
3601 | { | |
89ecc4f5 | 3602 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
3603 | char mapsfilename[MAXPATHLEN]; |
3604 | FILE *mapsfile; | |
3605 | long long addr, endaddr, size, offset, inode; | |
3606 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
3607 | int read, write, exec; | |
3608 | int ret; | |
7c8a8b04 | 3609 | struct cleanup *cleanup; |
dba24537 AC |
3610 | |
3611 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 3612 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 3613 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 3614 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 3615 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
3616 | |
3617 | if (info_verbose) | |
3618 | fprintf_filtered (gdb_stdout, | |
3619 | "Reading memory regions from %s\n", mapsfilename); | |
3620 | ||
3621 | /* Now iterate until end-of-file. */ | |
3622 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
3623 | &offset, &device[0], &inode, &filename[0])) | |
3624 | { | |
3625 | size = endaddr - addr; | |
3626 | ||
3627 | /* Get the segment's permissions. */ | |
3628 | read = (strchr (permissions, 'r') != 0); | |
3629 | write = (strchr (permissions, 'w') != 0); | |
3630 | exec = (strchr (permissions, 'x') != 0); | |
3631 | ||
3632 | if (info_verbose) | |
3633 | { | |
3634 | fprintf_filtered (gdb_stdout, | |
5af949e3 UW |
3635 | "Save segment, %lld bytes at %s (%c%c%c)", |
3636 | size, paddress (target_gdbarch, addr), | |
dba24537 AC |
3637 | read ? 'r' : ' ', |
3638 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 3639 | if (filename[0]) |
dba24537 AC |
3640 | fprintf_filtered (gdb_stdout, " for %s", filename); |
3641 | fprintf_filtered (gdb_stdout, "\n"); | |
3642 | } | |
3643 | ||
3644 | /* Invoke the callback function to create the corefile | |
3645 | segment. */ | |
3646 | func (addr, size, read, write, exec, obfd); | |
3647 | } | |
7c8a8b04 | 3648 | do_cleanups (cleanup); |
dba24537 AC |
3649 | return 0; |
3650 | } | |
3651 | ||
2020b7ab PA |
3652 | static int |
3653 | find_signalled_thread (struct thread_info *info, void *data) | |
3654 | { | |
3655 | if (info->stop_signal != TARGET_SIGNAL_0 | |
3656 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) | |
3657 | return 1; | |
3658 | ||
3659 | return 0; | |
3660 | } | |
3661 | ||
3662 | static enum target_signal | |
3663 | find_stop_signal (void) | |
3664 | { | |
3665 | struct thread_info *info = | |
3666 | iterate_over_threads (find_signalled_thread, NULL); | |
3667 | ||
3668 | if (info) | |
3669 | return info->stop_signal; | |
3670 | else | |
3671 | return TARGET_SIGNAL_0; | |
3672 | } | |
3673 | ||
dba24537 AC |
3674 | /* Records the thread's register state for the corefile note |
3675 | section. */ | |
3676 | ||
3677 | static char * | |
3678 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
3679 | char *note_data, int *note_size, |
3680 | enum target_signal stop_signal) | |
dba24537 AC |
3681 | { |
3682 | gdb_gregset_t gregs; | |
3683 | gdb_fpregset_t fpregs; | |
dba24537 | 3684 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
3685 | struct gdbarch *gdbarch = target_gdbarch; |
3686 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 3687 | const struct regset *regset; |
55e969c1 | 3688 | int core_regset_p; |
594f7785 | 3689 | struct cleanup *old_chain; |
17ea7499 CES |
3690 | struct core_regset_section *sect_list; |
3691 | char *gdb_regset; | |
594f7785 UW |
3692 | |
3693 | old_chain = save_inferior_ptid (); | |
3694 | inferior_ptid = ptid; | |
3695 | target_fetch_registers (regcache, -1); | |
3696 | do_cleanups (old_chain); | |
4f844a66 DM |
3697 | |
3698 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
3699 | sect_list = gdbarch_core_regset_sections (gdbarch); |
3700 | ||
55e969c1 DM |
3701 | if (core_regset_p |
3702 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3703 | sizeof (gregs))) != NULL | |
3704 | && regset->collect_regset != NULL) | |
594f7785 | 3705 | regset->collect_regset (regset, regcache, -1, |
55e969c1 | 3706 | &gregs, sizeof (gregs)); |
4f844a66 | 3707 | else |
594f7785 | 3708 | fill_gregset (regcache, &gregs, -1); |
4f844a66 | 3709 | |
55e969c1 DM |
3710 | note_data = (char *) elfcore_write_prstatus (obfd, |
3711 | note_data, | |
3712 | note_size, | |
3713 | lwp, | |
3714 | stop_signal, &gregs); | |
3715 | ||
17ea7499 CES |
3716 | /* The loop below uses the new struct core_regset_section, which stores |
3717 | the supported section names and sizes for the core file. Note that | |
3718 | note PRSTATUS needs to be treated specially. But the other notes are | |
3719 | structurally the same, so they can benefit from the new struct. */ | |
3720 | if (core_regset_p && sect_list != NULL) | |
3721 | while (sect_list->sect_name != NULL) | |
3722 | { | |
3723 | /* .reg was already handled above. */ | |
3724 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
3725 | { | |
3726 | sect_list++; | |
3727 | continue; | |
3728 | } | |
3729 | regset = gdbarch_regset_from_core_section (gdbarch, | |
3730 | sect_list->sect_name, | |
3731 | sect_list->size); | |
3732 | gdb_assert (regset && regset->collect_regset); | |
3733 | gdb_regset = xmalloc (sect_list->size); | |
3734 | regset->collect_regset (regset, regcache, -1, | |
3735 | gdb_regset, sect_list->size); | |
3736 | note_data = (char *) elfcore_write_register_note (obfd, | |
3737 | note_data, | |
3738 | note_size, | |
3739 | sect_list->sect_name, | |
3740 | gdb_regset, | |
3741 | sect_list->size); | |
3742 | xfree (gdb_regset); | |
3743 | sect_list++; | |
3744 | } | |
dba24537 | 3745 | |
17ea7499 CES |
3746 | /* For architectures that does not have the struct core_regset_section |
3747 | implemented, we use the old method. When all the architectures have | |
3748 | the new support, the code below should be deleted. */ | |
4f844a66 | 3749 | else |
17ea7499 CES |
3750 | { |
3751 | if (core_regset_p | |
3752 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3753 | sizeof (fpregs))) != NULL | |
3754 | && regset->collect_regset != NULL) | |
3755 | regset->collect_regset (regset, regcache, -1, | |
3756 | &fpregs, sizeof (fpregs)); | |
3757 | else | |
3758 | fill_fpregset (regcache, &fpregs, -1); | |
3759 | ||
3760 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
3761 | note_data, | |
3762 | note_size, | |
3763 | &fpregs, sizeof (fpregs)); | |
3764 | } | |
4f844a66 | 3765 | |
dba24537 AC |
3766 | return note_data; |
3767 | } | |
3768 | ||
3769 | struct linux_nat_corefile_thread_data | |
3770 | { | |
3771 | bfd *obfd; | |
3772 | char *note_data; | |
3773 | int *note_size; | |
3774 | int num_notes; | |
2020b7ab | 3775 | enum target_signal stop_signal; |
dba24537 AC |
3776 | }; |
3777 | ||
3778 | /* Called by gdbthread.c once per thread. Records the thread's | |
3779 | register state for the corefile note section. */ | |
3780 | ||
3781 | static int | |
3782 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
3783 | { | |
3784 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 3785 | |
dba24537 AC |
3786 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
3787 | ti->ptid, | |
3788 | args->note_data, | |
2020b7ab PA |
3789 | args->note_size, |
3790 | args->stop_signal); | |
dba24537 | 3791 | args->num_notes++; |
56be3814 | 3792 | |
dba24537 AC |
3793 | return 0; |
3794 | } | |
3795 | ||
efcbbd14 UW |
3796 | /* Enumerate spufs IDs for process PID. */ |
3797 | ||
3798 | static void | |
3799 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
3800 | { | |
3801 | char path[128]; | |
3802 | DIR *dir; | |
3803 | struct dirent *entry; | |
3804 | ||
3805 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
3806 | dir = opendir (path); | |
3807 | if (!dir) | |
3808 | return; | |
3809 | ||
3810 | rewinddir (dir); | |
3811 | while ((entry = readdir (dir)) != NULL) | |
3812 | { | |
3813 | struct stat st; | |
3814 | struct statfs stfs; | |
3815 | int fd; | |
3816 | ||
3817 | fd = atoi (entry->d_name); | |
3818 | if (!fd) | |
3819 | continue; | |
3820 | ||
3821 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
3822 | if (stat (path, &st) != 0) | |
3823 | continue; | |
3824 | if (!S_ISDIR (st.st_mode)) | |
3825 | continue; | |
3826 | ||
3827 | if (statfs (path, &stfs) != 0) | |
3828 | continue; | |
3829 | if (stfs.f_type != SPUFS_MAGIC) | |
3830 | continue; | |
3831 | ||
3832 | callback (data, fd); | |
3833 | } | |
3834 | ||
3835 | closedir (dir); | |
3836 | } | |
3837 | ||
3838 | /* Generate corefile notes for SPU contexts. */ | |
3839 | ||
3840 | struct linux_spu_corefile_data | |
3841 | { | |
3842 | bfd *obfd; | |
3843 | char *note_data; | |
3844 | int *note_size; | |
3845 | }; | |
3846 | ||
3847 | static void | |
3848 | linux_spu_corefile_callback (void *data, int fd) | |
3849 | { | |
3850 | struct linux_spu_corefile_data *args = data; | |
3851 | int i; | |
3852 | ||
3853 | static const char *spu_files[] = | |
3854 | { | |
3855 | "object-id", | |
3856 | "mem", | |
3857 | "regs", | |
3858 | "fpcr", | |
3859 | "lslr", | |
3860 | "decr", | |
3861 | "decr_status", | |
3862 | "signal1", | |
3863 | "signal1_type", | |
3864 | "signal2", | |
3865 | "signal2_type", | |
3866 | "event_mask", | |
3867 | "event_status", | |
3868 | "mbox_info", | |
3869 | "ibox_info", | |
3870 | "wbox_info", | |
3871 | "dma_info", | |
3872 | "proxydma_info", | |
3873 | }; | |
3874 | ||
3875 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
3876 | { | |
3877 | char annex[32], note_name[32]; | |
3878 | gdb_byte *spu_data; | |
3879 | LONGEST spu_len; | |
3880 | ||
3881 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
3882 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
3883 | annex, &spu_data); | |
3884 | if (spu_len > 0) | |
3885 | { | |
3886 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
3887 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
3888 | args->note_size, note_name, | |
3889 | NT_SPU, spu_data, spu_len); | |
3890 | xfree (spu_data); | |
3891 | } | |
3892 | } | |
3893 | } | |
3894 | ||
3895 | static char * | |
3896 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
3897 | { | |
3898 | struct linux_spu_corefile_data args; | |
3899 | args.obfd = obfd; | |
3900 | args.note_data = note_data; | |
3901 | args.note_size = note_size; | |
3902 | ||
3903 | iterate_over_spus (PIDGET (inferior_ptid), | |
3904 | linux_spu_corefile_callback, &args); | |
3905 | ||
3906 | return args.note_data; | |
3907 | } | |
3908 | ||
dba24537 AC |
3909 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
3910 | section for a corefile, and returns it in a malloc buffer. */ | |
3911 | ||
3912 | static char * | |
3913 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
3914 | { | |
3915 | struct linux_nat_corefile_thread_data thread_args; | |
3916 | struct cleanup *old_chain; | |
d99148ef | 3917 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 3918 | char fname[16] = { '\0' }; |
d99148ef | 3919 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
3920 | char psargs[80] = { '\0' }; |
3921 | char *note_data = NULL; | |
3922 | ptid_t current_ptid = inferior_ptid; | |
d90e17a7 | 3923 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 3924 | gdb_byte *auxv; |
dba24537 AC |
3925 | int auxv_len; |
3926 | ||
3927 | if (get_exec_file (0)) | |
3928 | { | |
3929 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
3930 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
3931 | if (get_inferior_args ()) | |
3932 | { | |
d99148ef JK |
3933 | char *string_end; |
3934 | char *psargs_end = psargs + sizeof (psargs); | |
3935 | ||
3936 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
3937 | strings fine. */ | |
3938 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
3939 | if (string_end != NULL) | |
3940 | { | |
3941 | *string_end++ = ' '; | |
3942 | strncpy (string_end, get_inferior_args (), | |
3943 | psargs_end - string_end); | |
3944 | } | |
dba24537 AC |
3945 | } |
3946 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
3947 | note_data, | |
3948 | note_size, fname, psargs); | |
3949 | } | |
3950 | ||
3951 | /* Dump information for threads. */ | |
3952 | thread_args.obfd = obfd; | |
3953 | thread_args.note_data = note_data; | |
3954 | thread_args.note_size = note_size; | |
3955 | thread_args.num_notes = 0; | |
2020b7ab | 3956 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 3957 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
3958 | gdb_assert (thread_args.num_notes != 0); |
3959 | note_data = thread_args.note_data; | |
dba24537 | 3960 | |
13547ab6 DJ |
3961 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
3962 | NULL, &auxv); | |
dba24537 AC |
3963 | if (auxv_len > 0) |
3964 | { | |
3965 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
3966 | "CORE", NT_AUXV, auxv, auxv_len); | |
3967 | xfree (auxv); | |
3968 | } | |
3969 | ||
efcbbd14 UW |
3970 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
3971 | ||
dba24537 AC |
3972 | make_cleanup (xfree, note_data); |
3973 | return note_data; | |
3974 | } | |
3975 | ||
3976 | /* Implement the "info proc" command. */ | |
3977 | ||
3978 | static void | |
3979 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
3980 | { | |
89ecc4f5 DE |
3981 | /* A long is used for pid instead of an int to avoid a loss of precision |
3982 | compiler warning from the output of strtoul. */ | |
3983 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
3984 | FILE *procfile; |
3985 | char **argv = NULL; | |
3986 | char buffer[MAXPATHLEN]; | |
3987 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
3988 | int cmdline_f = 1; | |
3989 | int cwd_f = 1; | |
3990 | int exe_f = 1; | |
3991 | int mappings_f = 0; | |
3992 | int environ_f = 0; | |
3993 | int status_f = 0; | |
3994 | int stat_f = 0; | |
3995 | int all = 0; | |
3996 | struct stat dummy; | |
3997 | ||
3998 | if (args) | |
3999 | { | |
4000 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
4001 | argv = gdb_buildargv (args); |
4002 | make_cleanup_freeargv (argv); | |
dba24537 AC |
4003 | } |
4004 | while (argv != NULL && *argv != NULL) | |
4005 | { | |
4006 | if (isdigit (argv[0][0])) | |
4007 | { | |
4008 | pid = strtoul (argv[0], NULL, 10); | |
4009 | } | |
4010 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
4011 | { | |
4012 | mappings_f = 1; | |
4013 | } | |
4014 | else if (strcmp (argv[0], "status") == 0) | |
4015 | { | |
4016 | status_f = 1; | |
4017 | } | |
4018 | else if (strcmp (argv[0], "stat") == 0) | |
4019 | { | |
4020 | stat_f = 1; | |
4021 | } | |
4022 | else if (strcmp (argv[0], "cmd") == 0) | |
4023 | { | |
4024 | cmdline_f = 1; | |
4025 | } | |
4026 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
4027 | { | |
4028 | exe_f = 1; | |
4029 | } | |
4030 | else if (strcmp (argv[0], "cwd") == 0) | |
4031 | { | |
4032 | cwd_f = 1; | |
4033 | } | |
4034 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
4035 | { | |
4036 | all = 1; | |
4037 | } | |
4038 | else | |
4039 | { | |
4040 | /* [...] (future options here) */ | |
4041 | } | |
4042 | argv++; | |
4043 | } | |
4044 | if (pid == 0) | |
8a3fe4f8 | 4045 | error (_("No current process: you must name one.")); |
dba24537 | 4046 | |
89ecc4f5 | 4047 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4048 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4049 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4050 | |
89ecc4f5 | 4051 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
4052 | if (cmdline_f || all) |
4053 | { | |
89ecc4f5 | 4054 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4055 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4056 | { |
7c8a8b04 | 4057 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
bf1d7d9c JB |
4058 | if (fgets (buffer, sizeof (buffer), procfile)) |
4059 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4060 | else | |
4061 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4062 | do_cleanups (cleanup); |
dba24537 AC |
4063 | } |
4064 | else | |
8a3fe4f8 | 4065 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4066 | } |
4067 | if (cwd_f || all) | |
4068 | { | |
89ecc4f5 | 4069 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4070 | memset (fname2, 0, sizeof (fname2)); |
4071 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4072 | printf_filtered ("cwd = '%s'\n", fname2); | |
4073 | else | |
8a3fe4f8 | 4074 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4075 | } |
4076 | if (exe_f || all) | |
4077 | { | |
89ecc4f5 | 4078 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4079 | memset (fname2, 0, sizeof (fname2)); |
4080 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4081 | printf_filtered ("exe = '%s'\n", fname2); | |
4082 | else | |
8a3fe4f8 | 4083 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4084 | } |
4085 | if (mappings_f || all) | |
4086 | { | |
89ecc4f5 | 4087 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4088 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4089 | { |
4090 | long long addr, endaddr, size, offset, inode; | |
4091 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4092 | struct cleanup *cleanup; |
dba24537 | 4093 | |
7c8a8b04 | 4094 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4095 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4096 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4097 | { |
4098 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4099 | "Start Addr", | |
4100 | " End Addr", | |
4101 | " Size", " Offset", "objfile"); | |
4102 | } | |
4103 | else | |
4104 | { | |
4105 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4106 | "Start Addr", | |
4107 | " End Addr", | |
4108 | " Size", " Offset", "objfile"); | |
4109 | } | |
4110 | ||
4111 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4112 | &offset, &device[0], &inode, &filename[0])) | |
4113 | { | |
4114 | size = endaddr - addr; | |
4115 | ||
4116 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4117 | calls here (and possibly above) should be abstracted | |
4118 | out into their own functions? Andrew suggests using | |
4119 | a generic local_address_string instead to print out | |
4120 | the addresses; that makes sense to me, too. */ | |
4121 | ||
a97b0ac8 | 4122 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4123 | { |
4124 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4125 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4126 | (unsigned long) endaddr, | |
4127 | (int) size, | |
4128 | (unsigned int) offset, | |
4129 | filename[0] ? filename : ""); | |
4130 | } | |
4131 | else | |
4132 | { | |
4133 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4134 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4135 | (unsigned long) endaddr, | |
4136 | (int) size, | |
4137 | (unsigned int) offset, | |
4138 | filename[0] ? filename : ""); | |
4139 | } | |
4140 | } | |
4141 | ||
7c8a8b04 | 4142 | do_cleanups (cleanup); |
dba24537 AC |
4143 | } |
4144 | else | |
8a3fe4f8 | 4145 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4146 | } |
4147 | if (status_f || all) | |
4148 | { | |
89ecc4f5 | 4149 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4150 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4151 | { |
7c8a8b04 | 4152 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4153 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4154 | puts_filtered (buffer); | |
7c8a8b04 | 4155 | do_cleanups (cleanup); |
dba24537 AC |
4156 | } |
4157 | else | |
8a3fe4f8 | 4158 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4159 | } |
4160 | if (stat_f || all) | |
4161 | { | |
89ecc4f5 | 4162 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4163 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4164 | { |
4165 | int itmp; | |
4166 | char ctmp; | |
a25694b4 | 4167 | long ltmp; |
7c8a8b04 | 4168 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4169 | |
4170 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4171 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4172 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4173 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4174 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4175 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4176 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4177 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4178 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4179 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4180 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4181 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4182 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4183 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4184 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4185 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4186 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4187 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4188 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4189 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4190 | (unsigned long) ltmp); | |
4191 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4192 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4193 | (unsigned long) ltmp); | |
4194 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4195 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4196 | (unsigned long) ltmp); | |
4197 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4198 | printf_filtered (_("Major faults, children: %lu\n"), | |
4199 | (unsigned long) ltmp); | |
4200 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4201 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4202 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4203 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4204 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4205 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4206 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4207 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4208 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4209 | printf_filtered (_("jiffies remaining in current time slice: %ld\n"), | |
4210 | ltmp); | |
4211 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4212 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4213 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4214 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4215 | (unsigned long) ltmp); | |
4216 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4217 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4218 | (unsigned long) ltmp); | |
4219 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4220 | printf_filtered (_("start time (jiffies since system boot): %ld\n"), | |
4221 | ltmp); | |
4222 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4223 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4224 | (unsigned long) ltmp); | |
4225 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4226 | printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp); | |
4227 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4228 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4229 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4230 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4231 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4232 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4233 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4234 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
dba24537 AC |
4235 | #if 0 /* Don't know how architecture-dependent the rest is... |
4236 | Anyway the signal bitmap info is available from "status". */ | |
a25694b4 AS |
4237 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
4238 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); | |
4239 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
4240 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); | |
4241 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4242 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
4243 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4244 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
4245 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4246 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
4247 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4248 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
4249 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
4250 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); | |
dba24537 | 4251 | #endif |
7c8a8b04 | 4252 | do_cleanups (cleanup); |
dba24537 AC |
4253 | } |
4254 | else | |
8a3fe4f8 | 4255 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4256 | } |
4257 | } | |
4258 | ||
10d6c8cd DJ |
4259 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
4260 | filesystem. Because we can use a single read() call for /proc, this | |
4261 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
4262 | but it doesn't support writes. */ | |
4263 | ||
4264 | static LONGEST | |
4265 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
4266 | const char *annex, gdb_byte *readbuf, | |
4267 | const gdb_byte *writebuf, | |
4268 | ULONGEST offset, LONGEST len) | |
dba24537 | 4269 | { |
10d6c8cd DJ |
4270 | LONGEST ret; |
4271 | int fd; | |
dba24537 AC |
4272 | char filename[64]; |
4273 | ||
10d6c8cd | 4274 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
4275 | return 0; |
4276 | ||
4277 | /* Don't bother for one word. */ | |
4278 | if (len < 3 * sizeof (long)) | |
4279 | return 0; | |
4280 | ||
4281 | /* We could keep this file open and cache it - possibly one per | |
4282 | thread. That requires some juggling, but is even faster. */ | |
4283 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
4284 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
4285 | if (fd == -1) | |
4286 | return 0; | |
4287 | ||
4288 | /* If pread64 is available, use it. It's faster if the kernel | |
4289 | supports it (only one syscall), and it's 64-bit safe even on | |
4290 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4291 | application). */ | |
4292 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4293 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4294 | #else |
10d6c8cd | 4295 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4296 | #endif |
4297 | ret = 0; | |
4298 | else | |
4299 | ret = len; | |
4300 | ||
4301 | close (fd); | |
4302 | return ret; | |
4303 | } | |
4304 | ||
efcbbd14 UW |
4305 | |
4306 | /* Enumerate spufs IDs for process PID. */ | |
4307 | static LONGEST | |
4308 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
4309 | { | |
4310 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
4311 | LONGEST pos = 0; | |
4312 | LONGEST written = 0; | |
4313 | char path[128]; | |
4314 | DIR *dir; | |
4315 | struct dirent *entry; | |
4316 | ||
4317 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4318 | dir = opendir (path); | |
4319 | if (!dir) | |
4320 | return -1; | |
4321 | ||
4322 | rewinddir (dir); | |
4323 | while ((entry = readdir (dir)) != NULL) | |
4324 | { | |
4325 | struct stat st; | |
4326 | struct statfs stfs; | |
4327 | int fd; | |
4328 | ||
4329 | fd = atoi (entry->d_name); | |
4330 | if (!fd) | |
4331 | continue; | |
4332 | ||
4333 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4334 | if (stat (path, &st) != 0) | |
4335 | continue; | |
4336 | if (!S_ISDIR (st.st_mode)) | |
4337 | continue; | |
4338 | ||
4339 | if (statfs (path, &stfs) != 0) | |
4340 | continue; | |
4341 | if (stfs.f_type != SPUFS_MAGIC) | |
4342 | continue; | |
4343 | ||
4344 | if (pos >= offset && pos + 4 <= offset + len) | |
4345 | { | |
4346 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
4347 | written += 4; | |
4348 | } | |
4349 | pos += 4; | |
4350 | } | |
4351 | ||
4352 | closedir (dir); | |
4353 | return written; | |
4354 | } | |
4355 | ||
4356 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4357 | object type, using the /proc file system. */ | |
4358 | static LONGEST | |
4359 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
4360 | const char *annex, gdb_byte *readbuf, | |
4361 | const gdb_byte *writebuf, | |
4362 | ULONGEST offset, LONGEST len) | |
4363 | { | |
4364 | char buf[128]; | |
4365 | int fd = 0; | |
4366 | int ret = -1; | |
4367 | int pid = PIDGET (inferior_ptid); | |
4368 | ||
4369 | if (!annex) | |
4370 | { | |
4371 | if (!readbuf) | |
4372 | return -1; | |
4373 | else | |
4374 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4375 | } | |
4376 | ||
4377 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
4378 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4379 | if (fd <= 0) | |
4380 | return -1; | |
4381 | ||
4382 | if (offset != 0 | |
4383 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4384 | { | |
4385 | close (fd); | |
4386 | return 0; | |
4387 | } | |
4388 | ||
4389 | if (writebuf) | |
4390 | ret = write (fd, writebuf, (size_t) len); | |
4391 | else if (readbuf) | |
4392 | ret = read (fd, readbuf, (size_t) len); | |
4393 | ||
4394 | close (fd); | |
4395 | return ret; | |
4396 | } | |
4397 | ||
4398 | ||
dba24537 AC |
4399 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
4400 | ||
4401 | static void | |
4402 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4403 | { | |
4404 | int len = strlen (line) - 1; | |
4405 | const char *p; | |
4406 | int signum; | |
4407 | ||
4408 | if (line[len] != '\n') | |
8a3fe4f8 | 4409 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4410 | |
4411 | p = line; | |
4412 | signum = len * 4; | |
4413 | while (len-- > 0) | |
4414 | { | |
4415 | int digit; | |
4416 | ||
4417 | if (*p >= '0' && *p <= '9') | |
4418 | digit = *p - '0'; | |
4419 | else if (*p >= 'a' && *p <= 'f') | |
4420 | digit = *p - 'a' + 10; | |
4421 | else | |
8a3fe4f8 | 4422 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4423 | |
4424 | signum -= 4; | |
4425 | ||
4426 | if (digit & 1) | |
4427 | sigaddset (sigs, signum + 1); | |
4428 | if (digit & 2) | |
4429 | sigaddset (sigs, signum + 2); | |
4430 | if (digit & 4) | |
4431 | sigaddset (sigs, signum + 3); | |
4432 | if (digit & 8) | |
4433 | sigaddset (sigs, signum + 4); | |
4434 | ||
4435 | p++; | |
4436 | } | |
4437 | } | |
4438 | ||
4439 | /* Find process PID's pending signals from /proc/pid/status and set | |
4440 | SIGS to match. */ | |
4441 | ||
4442 | void | |
4443 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
4444 | { | |
4445 | FILE *procfile; | |
4446 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
4447 | int signum; | |
7c8a8b04 | 4448 | struct cleanup *cleanup; |
dba24537 AC |
4449 | |
4450 | sigemptyset (pending); | |
4451 | sigemptyset (blocked); | |
4452 | sigemptyset (ignored); | |
4453 | sprintf (fname, "/proc/%d/status", pid); | |
4454 | procfile = fopen (fname, "r"); | |
4455 | if (procfile == NULL) | |
8a3fe4f8 | 4456 | error (_("Could not open %s"), fname); |
7c8a8b04 | 4457 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4458 | |
4459 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
4460 | { | |
4461 | /* Normal queued signals are on the SigPnd line in the status | |
4462 | file. However, 2.6 kernels also have a "shared" pending | |
4463 | queue for delivering signals to a thread group, so check for | |
4464 | a ShdPnd line also. | |
4465 | ||
4466 | Unfortunately some Red Hat kernels include the shared pending | |
4467 | queue but not the ShdPnd status field. */ | |
4468 | ||
4469 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
4470 | add_line_to_sigset (buffer + 8, pending); | |
4471 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
4472 | add_line_to_sigset (buffer + 8, pending); | |
4473 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
4474 | add_line_to_sigset (buffer + 8, blocked); | |
4475 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
4476 | add_line_to_sigset (buffer + 8, ignored); | |
4477 | } | |
4478 | ||
7c8a8b04 | 4479 | do_cleanups (cleanup); |
dba24537 AC |
4480 | } |
4481 | ||
07e059b5 VP |
4482 | static LONGEST |
4483 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
4484 | const char *annex, gdb_byte *readbuf, | |
4485 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4486 | { | |
4487 | /* We make the process list snapshot when the object starts to be | |
4488 | read. */ | |
4489 | static const char *buf; | |
4490 | static LONGEST len_avail = -1; | |
4491 | static struct obstack obstack; | |
4492 | ||
4493 | DIR *dirp; | |
4494 | ||
4495 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
4496 | ||
4497 | if (strcmp (annex, "processes") != 0) | |
4498 | return 0; | |
4499 | ||
4500 | gdb_assert (readbuf && !writebuf); | |
4501 | ||
4502 | if (offset == 0) | |
4503 | { | |
4504 | if (len_avail != -1 && len_avail != 0) | |
4505 | obstack_free (&obstack, NULL); | |
4506 | len_avail = 0; | |
4507 | buf = NULL; | |
4508 | obstack_init (&obstack); | |
4509 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
4510 | ||
4511 | dirp = opendir ("/proc"); | |
4512 | if (dirp) | |
4513 | { | |
4514 | struct dirent *dp; | |
4515 | while ((dp = readdir (dirp)) != NULL) | |
4516 | { | |
4517 | struct stat statbuf; | |
4518 | char procentry[sizeof ("/proc/4294967295")]; | |
4519 | ||
4520 | if (!isdigit (dp->d_name[0]) | |
1a6d2f2f | 4521 | || NAMELEN (dp) > sizeof ("4294967295") - 1) |
07e059b5 VP |
4522 | continue; |
4523 | ||
4524 | sprintf (procentry, "/proc/%s", dp->d_name); | |
4525 | if (stat (procentry, &statbuf) == 0 | |
4526 | && S_ISDIR (statbuf.st_mode)) | |
4527 | { | |
4528 | char *pathname; | |
4529 | FILE *f; | |
4530 | char cmd[MAXPATHLEN + 1]; | |
4531 | struct passwd *entry; | |
4532 | ||
4533 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
4534 | entry = getpwuid (statbuf.st_uid); | |
4535 | ||
4536 | if ((f = fopen (pathname, "r")) != NULL) | |
4537 | { | |
4538 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
4539 | if (len > 0) | |
4540 | { | |
4541 | int i; | |
4542 | for (i = 0; i < len; i++) | |
4543 | if (cmd[i] == '\0') | |
4544 | cmd[i] = ' '; | |
4545 | cmd[len] = '\0'; | |
4546 | ||
4547 | obstack_xml_printf ( | |
4548 | &obstack, | |
4549 | "<item>" | |
4550 | "<column name=\"pid\">%s</column>" | |
4551 | "<column name=\"user\">%s</column>" | |
4552 | "<column name=\"command\">%s</column>" | |
4553 | "</item>", | |
4554 | dp->d_name, | |
4555 | entry ? entry->pw_name : "?", | |
4556 | cmd); | |
4557 | } | |
4558 | fclose (f); | |
4559 | } | |
4560 | ||
4561 | xfree (pathname); | |
4562 | } | |
4563 | } | |
4564 | ||
4565 | closedir (dirp); | |
4566 | } | |
4567 | ||
4568 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
4569 | buf = obstack_finish (&obstack); | |
4570 | len_avail = strlen (buf); | |
4571 | } | |
4572 | ||
4573 | if (offset >= len_avail) | |
4574 | { | |
4575 | /* Done. Get rid of the obstack. */ | |
4576 | obstack_free (&obstack, NULL); | |
4577 | buf = NULL; | |
4578 | len_avail = 0; | |
4579 | return 0; | |
4580 | } | |
4581 | ||
4582 | if (len > len_avail - offset) | |
4583 | len = len_avail - offset; | |
4584 | memcpy (readbuf, buf + offset, len); | |
4585 | ||
4586 | return len; | |
4587 | } | |
4588 | ||
10d6c8cd DJ |
4589 | static LONGEST |
4590 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
4591 | const char *annex, gdb_byte *readbuf, | |
4592 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4593 | { | |
4594 | LONGEST xfer; | |
4595 | ||
4596 | if (object == TARGET_OBJECT_AUXV) | |
4597 | return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf, | |
4598 | offset, len); | |
4599 | ||
07e059b5 VP |
4600 | if (object == TARGET_OBJECT_OSDATA) |
4601 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
4602 | offset, len); | |
4603 | ||
efcbbd14 UW |
4604 | if (object == TARGET_OBJECT_SPU) |
4605 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
4606 | offset, len); | |
4607 | ||
8f313923 JK |
4608 | /* GDB calculates all the addresses in possibly larget width of the address. |
4609 | Address width needs to be masked before its final use - either by | |
4610 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
4611 | ||
4612 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
4613 | ||
4614 | if (object == TARGET_OBJECT_MEMORY) | |
4615 | { | |
4616 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
4617 | ||
4618 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
4619 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
4620 | } | |
4621 | ||
10d6c8cd DJ |
4622 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
4623 | offset, len); | |
4624 | if (xfer != 0) | |
4625 | return xfer; | |
4626 | ||
4627 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
4628 | offset, len); | |
4629 | } | |
4630 | ||
e9efe249 | 4631 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
4632 | it with local methods. */ |
4633 | ||
910122bf UW |
4634 | static void |
4635 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 4636 | { |
6d8fd2b7 UW |
4637 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
4638 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; | |
4639 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; | |
a96d9b2e | 4640 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 4641 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 4642 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
4643 | t->to_post_attach = linux_child_post_attach; |
4644 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
4645 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
4646 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
4647 | ||
4648 | super_xfer_partial = t->to_xfer_partial; | |
4649 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
4650 | } |
4651 | ||
4652 | struct target_ops * | |
4653 | linux_target (void) | |
4654 | { | |
4655 | struct target_ops *t; | |
4656 | ||
4657 | t = inf_ptrace_target (); | |
4658 | linux_target_install_ops (t); | |
4659 | ||
4660 | return t; | |
4661 | } | |
4662 | ||
4663 | struct target_ops * | |
7714d83a | 4664 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
4665 | { |
4666 | struct target_ops *t; | |
4667 | ||
4668 | t = inf_ptrace_trad_target (register_u_offset); | |
4669 | linux_target_install_ops (t); | |
10d6c8cd | 4670 | |
10d6c8cd DJ |
4671 | return t; |
4672 | } | |
4673 | ||
b84876c2 PA |
4674 | /* target_is_async_p implementation. */ |
4675 | ||
4676 | static int | |
4677 | linux_nat_is_async_p (void) | |
4678 | { | |
4679 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 4680 | it explicitly with the "set target-async" command. |
b84876c2 | 4681 | Someday, linux will always be async. */ |
c6ebd6cf | 4682 | if (!target_async_permitted) |
b84876c2 PA |
4683 | return 0; |
4684 | ||
d90e17a7 PA |
4685 | /* See target.h/target_async_mask. */ |
4686 | return linux_nat_async_mask_value; | |
b84876c2 PA |
4687 | } |
4688 | ||
4689 | /* target_can_async_p implementation. */ | |
4690 | ||
4691 | static int | |
4692 | linux_nat_can_async_p (void) | |
4693 | { | |
4694 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 4695 | it explicitly with the "set target-async" command. |
b84876c2 | 4696 | Someday, linux will always be async. */ |
c6ebd6cf | 4697 | if (!target_async_permitted) |
b84876c2 PA |
4698 | return 0; |
4699 | ||
4700 | /* See target.h/target_async_mask. */ | |
4701 | return linux_nat_async_mask_value; | |
4702 | } | |
4703 | ||
9908b566 VP |
4704 | static int |
4705 | linux_nat_supports_non_stop (void) | |
4706 | { | |
4707 | return 1; | |
4708 | } | |
4709 | ||
d90e17a7 PA |
4710 | /* True if we want to support multi-process. To be removed when GDB |
4711 | supports multi-exec. */ | |
4712 | ||
2277426b | 4713 | int linux_multi_process = 1; |
d90e17a7 PA |
4714 | |
4715 | static int | |
4716 | linux_nat_supports_multi_process (void) | |
4717 | { | |
4718 | return linux_multi_process; | |
4719 | } | |
4720 | ||
b84876c2 PA |
4721 | /* target_async_mask implementation. */ |
4722 | ||
4723 | static int | |
7feb7d06 | 4724 | linux_nat_async_mask (int new_mask) |
b84876c2 | 4725 | { |
7feb7d06 | 4726 | int curr_mask = linux_nat_async_mask_value; |
b84876c2 | 4727 | |
7feb7d06 | 4728 | if (curr_mask != new_mask) |
b84876c2 | 4729 | { |
7feb7d06 | 4730 | if (new_mask == 0) |
b84876c2 PA |
4731 | { |
4732 | linux_nat_async (NULL, 0); | |
7feb7d06 | 4733 | linux_nat_async_mask_value = new_mask; |
b84876c2 PA |
4734 | } |
4735 | else | |
4736 | { | |
7feb7d06 | 4737 | linux_nat_async_mask_value = new_mask; |
84e46146 | 4738 | |
7feb7d06 PA |
4739 | /* If we're going out of async-mask in all-stop, then the |
4740 | inferior is stopped. The next resume will call | |
4741 | target_async. In non-stop, the target event source | |
4742 | should be always registered in the event loop. Do so | |
4743 | now. */ | |
4744 | if (non_stop) | |
4745 | linux_nat_async (inferior_event_handler, 0); | |
b84876c2 PA |
4746 | } |
4747 | } | |
4748 | ||
7feb7d06 | 4749 | return curr_mask; |
b84876c2 PA |
4750 | } |
4751 | ||
4752 | static int async_terminal_is_ours = 1; | |
4753 | ||
4754 | /* target_terminal_inferior implementation. */ | |
4755 | ||
4756 | static void | |
4757 | linux_nat_terminal_inferior (void) | |
4758 | { | |
4759 | if (!target_is_async_p ()) | |
4760 | { | |
4761 | /* Async mode is disabled. */ | |
4762 | terminal_inferior (); | |
4763 | return; | |
4764 | } | |
4765 | ||
b84876c2 PA |
4766 | terminal_inferior (); |
4767 | ||
d9d2d8b6 | 4768 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
4769 | if (!async_terminal_is_ours) |
4770 | return; | |
4771 | ||
4772 | delete_file_handler (input_fd); | |
4773 | async_terminal_is_ours = 0; | |
4774 | set_sigint_trap (); | |
4775 | } | |
4776 | ||
4777 | /* target_terminal_ours implementation. */ | |
4778 | ||
2c0b251b | 4779 | static void |
b84876c2 PA |
4780 | linux_nat_terminal_ours (void) |
4781 | { | |
4782 | if (!target_is_async_p ()) | |
4783 | { | |
4784 | /* Async mode is disabled. */ | |
4785 | terminal_ours (); | |
4786 | return; | |
4787 | } | |
4788 | ||
4789 | /* GDB should never give the terminal to the inferior if the | |
4790 | inferior is running in the background (run&, continue&, etc.), | |
4791 | but claiming it sure should. */ | |
4792 | terminal_ours (); | |
4793 | ||
b84876c2 PA |
4794 | if (async_terminal_is_ours) |
4795 | return; | |
4796 | ||
4797 | clear_sigint_trap (); | |
4798 | add_file_handler (input_fd, stdin_event_handler, 0); | |
4799 | async_terminal_is_ours = 1; | |
4800 | } | |
4801 | ||
4802 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
4803 | void *context); | |
4804 | static void *async_client_context; | |
4805 | ||
7feb7d06 PA |
4806 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4807 | so we notice when any child changes state, and notify the | |
4808 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
4809 | above to wait for the arrival of a SIGCHLD. */ | |
4810 | ||
b84876c2 | 4811 | static void |
7feb7d06 | 4812 | sigchld_handler (int signo) |
b84876c2 | 4813 | { |
7feb7d06 PA |
4814 | int old_errno = errno; |
4815 | ||
4816 | if (debug_linux_nat_async) | |
4817 | fprintf_unfiltered (gdb_stdlog, "sigchld\n"); | |
4818 | ||
4819 | if (signo == SIGCHLD | |
4820 | && linux_nat_event_pipe[0] != -1) | |
4821 | async_file_mark (); /* Let the event loop know that there are | |
4822 | events to handle. */ | |
4823 | ||
4824 | errno = old_errno; | |
4825 | } | |
4826 | ||
4827 | /* Callback registered with the target events file descriptor. */ | |
4828 | ||
4829 | static void | |
4830 | handle_target_event (int error, gdb_client_data client_data) | |
4831 | { | |
4832 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
4833 | } | |
4834 | ||
4835 | /* Create/destroy the target events pipe. Returns previous state. */ | |
4836 | ||
4837 | static int | |
4838 | linux_async_pipe (int enable) | |
4839 | { | |
4840 | int previous = (linux_nat_event_pipe[0] != -1); | |
4841 | ||
4842 | if (previous != enable) | |
4843 | { | |
4844 | sigset_t prev_mask; | |
4845 | ||
4846 | block_child_signals (&prev_mask); | |
4847 | ||
4848 | if (enable) | |
4849 | { | |
4850 | if (pipe (linux_nat_event_pipe) == -1) | |
4851 | internal_error (__FILE__, __LINE__, | |
4852 | "creating event pipe failed."); | |
4853 | ||
4854 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4855 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4856 | } | |
4857 | else | |
4858 | { | |
4859 | close (linux_nat_event_pipe[0]); | |
4860 | close (linux_nat_event_pipe[1]); | |
4861 | linux_nat_event_pipe[0] = -1; | |
4862 | linux_nat_event_pipe[1] = -1; | |
4863 | } | |
4864 | ||
4865 | restore_child_signals_mask (&prev_mask); | |
4866 | } | |
4867 | ||
4868 | return previous; | |
b84876c2 PA |
4869 | } |
4870 | ||
4871 | /* target_async implementation. */ | |
4872 | ||
4873 | static void | |
4874 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
4875 | void *context), void *context) | |
4876 | { | |
c6ebd6cf | 4877 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
4878 | internal_error (__FILE__, __LINE__, |
4879 | "Calling target_async when async is masked"); | |
4880 | ||
4881 | if (callback != NULL) | |
4882 | { | |
4883 | async_client_callback = callback; | |
4884 | async_client_context = context; | |
7feb7d06 PA |
4885 | if (!linux_async_pipe (1)) |
4886 | { | |
4887 | add_file_handler (linux_nat_event_pipe[0], | |
4888 | handle_target_event, NULL); | |
4889 | /* There may be pending events to handle. Tell the event loop | |
4890 | to poll them. */ | |
4891 | async_file_mark (); | |
4892 | } | |
b84876c2 PA |
4893 | } |
4894 | else | |
4895 | { | |
4896 | async_client_callback = callback; | |
4897 | async_client_context = context; | |
b84876c2 | 4898 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 4899 | linux_async_pipe (0); |
b84876c2 PA |
4900 | } |
4901 | return; | |
4902 | } | |
4903 | ||
252fbfc8 PA |
4904 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
4905 | event came out. */ | |
4906 | ||
4c28f408 | 4907 | static int |
252fbfc8 | 4908 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 4909 | { |
d90e17a7 | 4910 | if (!lwp->stopped) |
252fbfc8 | 4911 | { |
d90e17a7 PA |
4912 | int pid, status; |
4913 | ptid_t ptid = lwp->ptid; | |
252fbfc8 | 4914 | |
d90e17a7 PA |
4915 | if (debug_linux_nat) |
4916 | fprintf_unfiltered (gdb_stdlog, | |
4917 | "LNSL: running -> suspending %s\n", | |
4918 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 4919 | |
252fbfc8 | 4920 | |
d90e17a7 PA |
4921 | stop_callback (lwp, NULL); |
4922 | stop_wait_callback (lwp, NULL); | |
252fbfc8 | 4923 | |
d90e17a7 PA |
4924 | /* If the lwp exits while we try to stop it, there's nothing |
4925 | else to do. */ | |
4926 | lwp = find_lwp_pid (ptid); | |
4927 | if (lwp == NULL) | |
4928 | return 0; | |
252fbfc8 | 4929 | |
d90e17a7 PA |
4930 | /* If we didn't collect any signal other than SIGSTOP while |
4931 | stopping the LWP, push a SIGNAL_0 event. In either case, the | |
4932 | event-loop will end up calling target_wait which will collect | |
4933 | these. */ | |
4934 | if (lwp->status == 0) | |
4935 | lwp->status = W_STOPCODE (0); | |
4936 | async_file_mark (); | |
4937 | } | |
4938 | else | |
4939 | { | |
4940 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 4941 | |
d90e17a7 PA |
4942 | if (debug_linux_nat) |
4943 | { | |
e09875d4 | 4944 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
d90e17a7 | 4945 | fprintf_unfiltered (gdb_stdlog, "\ |
252fbfc8 | 4946 | LNSL: already stopped/stop_requested %s\n", |
d90e17a7 PA |
4947 | target_pid_to_str (lwp->ptid)); |
4948 | else | |
4949 | fprintf_unfiltered (gdb_stdlog, "\ | |
252fbfc8 | 4950 | LNSL: already stopped/no stop_requested yet %s\n", |
d90e17a7 | 4951 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
4952 | } |
4953 | } | |
4c28f408 PA |
4954 | return 0; |
4955 | } | |
4956 | ||
4957 | static void | |
4958 | linux_nat_stop (ptid_t ptid) | |
4959 | { | |
4960 | if (non_stop) | |
d90e17a7 | 4961 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
4962 | else |
4963 | linux_ops->to_stop (ptid); | |
4964 | } | |
4965 | ||
d90e17a7 PA |
4966 | static void |
4967 | linux_nat_close (int quitting) | |
4968 | { | |
4969 | /* Unregister from the event loop. */ | |
4970 | if (target_is_async_p ()) | |
4971 | target_async (NULL, 0); | |
4972 | ||
4973 | /* Reset the async_masking. */ | |
4974 | linux_nat_async_mask_value = 1; | |
4975 | ||
4976 | if (linux_ops->to_close) | |
4977 | linux_ops->to_close (quitting); | |
4978 | } | |
4979 | ||
f973ed9c DJ |
4980 | void |
4981 | linux_nat_add_target (struct target_ops *t) | |
4982 | { | |
f973ed9c DJ |
4983 | /* Save the provided single-threaded target. We save this in a separate |
4984 | variable because another target we've inherited from (e.g. inf-ptrace) | |
4985 | may have saved a pointer to T; we want to use it for the final | |
4986 | process stratum target. */ | |
4987 | linux_ops_saved = *t; | |
4988 | linux_ops = &linux_ops_saved; | |
4989 | ||
4990 | /* Override some methods for multithreading. */ | |
b84876c2 | 4991 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
4992 | t->to_attach = linux_nat_attach; |
4993 | t->to_detach = linux_nat_detach; | |
4994 | t->to_resume = linux_nat_resume; | |
4995 | t->to_wait = linux_nat_wait; | |
4996 | t->to_xfer_partial = linux_nat_xfer_partial; | |
4997 | t->to_kill = linux_nat_kill; | |
4998 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
4999 | t->to_thread_alive = linux_nat_thread_alive; | |
5000 | t->to_pid_to_str = linux_nat_pid_to_str; | |
5001 | t->to_has_thread_control = tc_schedlock; | |
5002 | ||
b84876c2 PA |
5003 | t->to_can_async_p = linux_nat_can_async_p; |
5004 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5005 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
5006 | t->to_async = linux_nat_async; |
5007 | t->to_async_mask = linux_nat_async_mask; | |
5008 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
5009 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5010 | t->to_close = linux_nat_close; |
b84876c2 | 5011 | |
4c28f408 PA |
5012 | /* Methods for non-stop support. */ |
5013 | t->to_stop = linux_nat_stop; | |
5014 | ||
d90e17a7 PA |
5015 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5016 | ||
f973ed9c DJ |
5017 | /* We don't change the stratum; this target will sit at |
5018 | process_stratum and thread_db will set at thread_stratum. This | |
5019 | is a little strange, since this is a multi-threaded-capable | |
5020 | target, but we want to be on the stack below thread_db, and we | |
5021 | also want to be used for single-threaded processes. */ | |
5022 | ||
5023 | add_target (t); | |
f973ed9c DJ |
5024 | } |
5025 | ||
9f0bdab8 DJ |
5026 | /* Register a method to call whenever a new thread is attached. */ |
5027 | void | |
5028 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5029 | { | |
5030 | /* Save the pointer. We only support a single registered instance | |
5031 | of the GNU/Linux native target, so we do not need to map this to | |
5032 | T. */ | |
5033 | linux_nat_new_thread = new_thread; | |
5034 | } | |
5035 | ||
5b009018 PA |
5036 | /* Register a method that converts a siginfo object between the layout |
5037 | that ptrace returns, and the layout in the architecture of the | |
5038 | inferior. */ | |
5039 | void | |
5040 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5041 | int (*siginfo_fixup) (struct siginfo *, | |
5042 | gdb_byte *, | |
5043 | int)) | |
5044 | { | |
5045 | /* Save the pointer. */ | |
5046 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5047 | } | |
5048 | ||
9f0bdab8 DJ |
5049 | /* Return the saved siginfo associated with PTID. */ |
5050 | struct siginfo * | |
5051 | linux_nat_get_siginfo (ptid_t ptid) | |
5052 | { | |
5053 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5054 | ||
5055 | gdb_assert (lp != NULL); | |
5056 | ||
5057 | return &lp->siginfo; | |
5058 | } | |
5059 | ||
2c0b251b PA |
5060 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5061 | extern initialize_file_ftype _initialize_linux_nat; | |
5062 | ||
d6b0e80f AC |
5063 | void |
5064 | _initialize_linux_nat (void) | |
5065 | { | |
b84876c2 | 5066 | sigset_t mask; |
dba24537 | 5067 | |
1bedd215 AC |
5068 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
5069 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
5070 | Specify any process id, or use the program being debugged by default.\n\ |
5071 | Specify any of the following keywords for detailed info:\n\ | |
5072 | mappings -- list of mapped memory regions.\n\ | |
5073 | stat -- list a bunch of random process info.\n\ | |
5074 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 5075 | all -- list all available /proc info.")); |
d6b0e80f | 5076 | |
b84876c2 PA |
5077 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5078 | &debug_linux_nat, _("\ | |
5079 | Set debugging of GNU/Linux lwp module."), _("\ | |
5080 | Show debugging of GNU/Linux lwp module."), _("\ | |
5081 | Enables printf debugging output."), | |
5082 | NULL, | |
5083 | show_debug_linux_nat, | |
5084 | &setdebuglist, &showdebuglist); | |
5085 | ||
5086 | add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance, | |
5087 | &debug_linux_nat_async, _("\ | |
5088 | Set debugging of GNU/Linux async lwp module."), _("\ | |
5089 | Show debugging of GNU/Linux async lwp module."), _("\ | |
5090 | Enables printf debugging output."), | |
5091 | NULL, | |
5092 | show_debug_linux_nat_async, | |
5093 | &setdebuglist, &showdebuglist); | |
5094 | ||
b84876c2 | 5095 | /* Save this mask as the default. */ |
d6b0e80f AC |
5096 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5097 | ||
7feb7d06 PA |
5098 | /* Install a SIGCHLD handler. */ |
5099 | sigchld_action.sa_handler = sigchld_handler; | |
5100 | sigemptyset (&sigchld_action.sa_mask); | |
5101 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5102 | |
5103 | /* Make it the default. */ | |
7feb7d06 | 5104 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5105 | |
5106 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5107 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5108 | sigdelset (&suspend_mask, SIGCHLD); | |
5109 | ||
7feb7d06 | 5110 | sigemptyset (&blocked_mask); |
10568435 JK |
5111 | |
5112 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
5113 | &disable_randomization, _("\ | |
5114 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
5115 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
5116 | When this mode is on (which is the default), randomization of the virtual\n\ | |
5117 | address space is disabled. Standalone programs run with the randomization\n\ | |
5118 | enabled by default on some platforms."), | |
5119 | &set_disable_randomization, | |
5120 | &show_disable_randomization, | |
5121 | &setlist, &showlist); | |
d6b0e80f AC |
5122 | } |
5123 | \f | |
5124 | ||
5125 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5126 | the GNU/Linux Threads library and therefore doesn't really belong | |
5127 | here. */ | |
5128 | ||
5129 | /* Read variable NAME in the target and return its value if found. | |
5130 | Otherwise return zero. It is assumed that the type of the variable | |
5131 | is `int'. */ | |
5132 | ||
5133 | static int | |
5134 | get_signo (const char *name) | |
5135 | { | |
5136 | struct minimal_symbol *ms; | |
5137 | int signo; | |
5138 | ||
5139 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5140 | if (ms == NULL) | |
5141 | return 0; | |
5142 | ||
8e70166d | 5143 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5144 | sizeof (signo)) != 0) |
5145 | return 0; | |
5146 | ||
5147 | return signo; | |
5148 | } | |
5149 | ||
5150 | /* Return the set of signals used by the threads library in *SET. */ | |
5151 | ||
5152 | void | |
5153 | lin_thread_get_thread_signals (sigset_t *set) | |
5154 | { | |
5155 | struct sigaction action; | |
5156 | int restart, cancel; | |
5157 | ||
b84876c2 | 5158 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5159 | sigemptyset (set); |
5160 | ||
5161 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5162 | cancel = get_signo ("__pthread_sig_cancel"); |
5163 | ||
5164 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5165 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5166 | not provide any way for the debugger to query the signal numbers - | |
5167 | fortunately they don't change! */ | |
5168 | ||
d6b0e80f | 5169 | if (restart == 0) |
17fbb0bd | 5170 | restart = __SIGRTMIN; |
d6b0e80f | 5171 | |
d6b0e80f | 5172 | if (cancel == 0) |
17fbb0bd | 5173 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5174 | |
5175 | sigaddset (set, restart); | |
5176 | sigaddset (set, cancel); | |
5177 | ||
5178 | /* The GNU/Linux Threads library makes terminating threads send a | |
5179 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
5180 | those (to prevent them from terminating GDB itself, which is | |
5181 | likely to be their default action) and treat them the same way as | |
5182 | SIGCHLD. */ | |
5183 | ||
5184 | action.sa_handler = sigchld_handler; | |
5185 | sigemptyset (&action.sa_mask); | |
58aecb61 | 5186 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
5187 | sigaction (cancel, &action, NULL); |
5188 | ||
5189 | /* We block the "cancel" signal throughout this code ... */ | |
5190 | sigaddset (&blocked_mask, cancel); | |
5191 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
5192 | ||
5193 | /* ... except during a sigsuspend. */ | |
5194 | sigdelset (&suspend_mask, cancel); | |
5195 | } |