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)) | |
206aa767 DE |
983 | { |
984 | if (WSTOPSIG (status) == TRAP_IS_SYSCALL) | |
985 | snprintf (buf, sizeof (buf), "%s (stopped at syscall)", | |
986 | strsignal (SIGTRAP)); | |
987 | else | |
988 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
989 | strsignal (WSTOPSIG (status))); | |
990 | } | |
d6b0e80f AC |
991 | else if (WIFSIGNALED (status)) |
992 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
993 | strsignal (WSTOPSIG (status))); | |
994 | else | |
995 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
996 | ||
997 | return buf; | |
998 | } | |
999 | ||
1000 | /* Initialize the list of LWPs. Note that this module, contrary to | |
1001 | what GDB's generic threads layer does for its thread list, | |
1002 | re-initializes the LWP lists whenever we mourn or detach (which | |
1003 | doesn't involve mourning) the inferior. */ | |
1004 | ||
1005 | static void | |
1006 | init_lwp_list (void) | |
1007 | { | |
1008 | struct lwp_info *lp, *lpnext; | |
1009 | ||
1010 | for (lp = lwp_list; lp; lp = lpnext) | |
1011 | { | |
1012 | lpnext = lp->next; | |
1013 | xfree (lp); | |
1014 | } | |
1015 | ||
1016 | lwp_list = NULL; | |
d90e17a7 PA |
1017 | } |
1018 | ||
1019 | /* Remove all LWPs belong to PID from the lwp list. */ | |
1020 | ||
1021 | static void | |
1022 | purge_lwp_list (int pid) | |
1023 | { | |
1024 | struct lwp_info *lp, *lpprev, *lpnext; | |
1025 | ||
1026 | lpprev = NULL; | |
1027 | ||
1028 | for (lp = lwp_list; lp; lp = lpnext) | |
1029 | { | |
1030 | lpnext = lp->next; | |
1031 | ||
1032 | if (ptid_get_pid (lp->ptid) == pid) | |
1033 | { | |
1034 | if (lp == lwp_list) | |
1035 | lwp_list = lp->next; | |
1036 | else | |
1037 | lpprev->next = lp->next; | |
1038 | ||
1039 | xfree (lp); | |
1040 | } | |
1041 | else | |
1042 | lpprev = lp; | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | /* Return the number of known LWPs in the tgid given by PID. */ | |
1047 | ||
1048 | static int | |
1049 | num_lwps (int pid) | |
1050 | { | |
1051 | int count = 0; | |
1052 | struct lwp_info *lp; | |
1053 | ||
1054 | for (lp = lwp_list; lp; lp = lp->next) | |
1055 | if (ptid_get_pid (lp->ptid) == pid) | |
1056 | count++; | |
1057 | ||
1058 | return count; | |
d6b0e80f AC |
1059 | } |
1060 | ||
f973ed9c | 1061 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1062 | structure describing the new LWP. The LWP should already be stopped |
1063 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1064 | |
1065 | static struct lwp_info * | |
1066 | add_lwp (ptid_t ptid) | |
1067 | { | |
1068 | struct lwp_info *lp; | |
1069 | ||
1070 | gdb_assert (is_lwp (ptid)); | |
1071 | ||
1072 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1073 | ||
1074 | memset (lp, 0, sizeof (struct lwp_info)); | |
1075 | ||
1076 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1077 | ||
1078 | lp->ptid = ptid; | |
1079 | ||
1080 | lp->next = lwp_list; | |
1081 | lwp_list = lp; | |
d6b0e80f | 1082 | |
d90e17a7 | 1083 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1084 | linux_nat_new_thread (ptid); |
1085 | ||
d6b0e80f AC |
1086 | return lp; |
1087 | } | |
1088 | ||
1089 | /* Remove the LWP specified by PID from the list. */ | |
1090 | ||
1091 | static void | |
1092 | delete_lwp (ptid_t ptid) | |
1093 | { | |
1094 | struct lwp_info *lp, *lpprev; | |
1095 | ||
1096 | lpprev = NULL; | |
1097 | ||
1098 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1099 | if (ptid_equal (lp->ptid, ptid)) | |
1100 | break; | |
1101 | ||
1102 | if (!lp) | |
1103 | return; | |
1104 | ||
d6b0e80f AC |
1105 | if (lpprev) |
1106 | lpprev->next = lp->next; | |
1107 | else | |
1108 | lwp_list = lp->next; | |
1109 | ||
1110 | xfree (lp); | |
1111 | } | |
1112 | ||
1113 | /* Return a pointer to the structure describing the LWP corresponding | |
1114 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1115 | ||
1116 | static struct lwp_info * | |
1117 | find_lwp_pid (ptid_t ptid) | |
1118 | { | |
1119 | struct lwp_info *lp; | |
1120 | int lwp; | |
1121 | ||
1122 | if (is_lwp (ptid)) | |
1123 | lwp = GET_LWP (ptid); | |
1124 | else | |
1125 | lwp = GET_PID (ptid); | |
1126 | ||
1127 | for (lp = lwp_list; lp; lp = lp->next) | |
1128 | if (lwp == GET_LWP (lp->ptid)) | |
1129 | return lp; | |
1130 | ||
1131 | return NULL; | |
1132 | } | |
1133 | ||
d90e17a7 PA |
1134 | /* Returns true if PTID matches filter FILTER. FILTER can be the wild |
1135 | card MINUS_ONE_PTID (all ptid match it); can be a ptid representing | |
1136 | a process (ptid_is_pid returns true), in which case, all lwps of | |
1137 | that give process match, lwps of other process do not; or, it can | |
1138 | represent a specific thread, in which case, only that thread will | |
1139 | match true. PTID must represent an LWP, it can never be a wild | |
1140 | card. */ | |
1141 | ||
1142 | static int | |
1143 | ptid_match (ptid_t ptid, ptid_t filter) | |
1144 | { | |
1145 | /* Since both parameters have the same type, prevent easy mistakes | |
1146 | from happening. */ | |
1147 | gdb_assert (!ptid_equal (ptid, minus_one_ptid) | |
1148 | && !ptid_equal (ptid, null_ptid)); | |
1149 | ||
1150 | if (ptid_equal (filter, minus_one_ptid)) | |
1151 | return 1; | |
1152 | if (ptid_is_pid (filter) | |
1153 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
1154 | return 1; | |
1155 | else if (ptid_equal (ptid, filter)) | |
1156 | return 1; | |
1157 | ||
1158 | return 0; | |
1159 | } | |
1160 | ||
d6b0e80f AC |
1161 | /* Call CALLBACK with its second argument set to DATA for every LWP in |
1162 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1163 | pointer to the structure describing that LWP immediately. | |
1164 | Otherwise return NULL. */ | |
1165 | ||
1166 | struct lwp_info * | |
d90e17a7 PA |
1167 | iterate_over_lwps (ptid_t filter, |
1168 | int (*callback) (struct lwp_info *, void *), | |
1169 | void *data) | |
d6b0e80f AC |
1170 | { |
1171 | struct lwp_info *lp, *lpnext; | |
1172 | ||
1173 | for (lp = lwp_list; lp; lp = lpnext) | |
1174 | { | |
1175 | lpnext = lp->next; | |
d90e17a7 PA |
1176 | |
1177 | if (ptid_match (lp->ptid, filter)) | |
1178 | { | |
1179 | if ((*callback) (lp, data)) | |
1180 | return lp; | |
1181 | } | |
d6b0e80f AC |
1182 | } |
1183 | ||
1184 | return NULL; | |
1185 | } | |
1186 | ||
2277426b PA |
1187 | /* Update our internal state when changing from one checkpoint to |
1188 | another indicated by NEW_PTID. We can only switch single-threaded | |
1189 | applications, so we only create one new LWP, and the previous list | |
1190 | is discarded. */ | |
f973ed9c DJ |
1191 | |
1192 | void | |
1193 | linux_nat_switch_fork (ptid_t new_ptid) | |
1194 | { | |
1195 | struct lwp_info *lp; | |
1196 | ||
2277426b PA |
1197 | purge_lwp_list (GET_PID (inferior_ptid)); |
1198 | ||
f973ed9c DJ |
1199 | lp = add_lwp (new_ptid); |
1200 | lp->stopped = 1; | |
e26af52f | 1201 | |
2277426b PA |
1202 | /* This changes the thread's ptid while preserving the gdb thread |
1203 | num. Also changes the inferior pid, while preserving the | |
1204 | inferior num. */ | |
1205 | thread_change_ptid (inferior_ptid, new_ptid); | |
1206 | ||
1207 | /* We've just told GDB core that the thread changed target id, but, | |
1208 | in fact, it really is a different thread, with different register | |
1209 | contents. */ | |
1210 | registers_changed (); | |
e26af52f DJ |
1211 | } |
1212 | ||
e26af52f DJ |
1213 | /* Handle the exit of a single thread LP. */ |
1214 | ||
1215 | static void | |
1216 | exit_lwp (struct lwp_info *lp) | |
1217 | { | |
e09875d4 | 1218 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1219 | |
1220 | if (th) | |
e26af52f | 1221 | { |
17faa917 DJ |
1222 | if (print_thread_events) |
1223 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1224 | ||
4f8d22e3 | 1225 | delete_thread (lp->ptid); |
e26af52f DJ |
1226 | } |
1227 | ||
1228 | delete_lwp (lp->ptid); | |
1229 | } | |
1230 | ||
4d062f1a PA |
1231 | /* Return an lwp's tgid, found in `/proc/PID/status'. */ |
1232 | ||
1233 | int | |
1234 | linux_proc_get_tgid (int lwpid) | |
1235 | { | |
1236 | FILE *status_file; | |
1237 | char buf[100]; | |
1238 | int tgid = -1; | |
1239 | ||
1240 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); | |
1241 | status_file = fopen (buf, "r"); | |
1242 | if (status_file != NULL) | |
1243 | { | |
1244 | while (fgets (buf, sizeof (buf), status_file)) | |
1245 | { | |
1246 | if (strncmp (buf, "Tgid:", 5) == 0) | |
1247 | { | |
1248 | tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10); | |
1249 | break; | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | fclose (status_file); | |
1254 | } | |
1255 | ||
1256 | return tgid; | |
1257 | } | |
1258 | ||
a0ef4274 DJ |
1259 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1260 | Other states including `T (tracing stop)' are reported as false. */ | |
1261 | ||
1262 | static int | |
1263 | pid_is_stopped (pid_t pid) | |
1264 | { | |
1265 | FILE *status_file; | |
1266 | char buf[100]; | |
1267 | int retval = 0; | |
1268 | ||
1269 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1270 | status_file = fopen (buf, "r"); | |
1271 | if (status_file != NULL) | |
1272 | { | |
1273 | int have_state = 0; | |
1274 | ||
1275 | while (fgets (buf, sizeof (buf), status_file)) | |
1276 | { | |
1277 | if (strncmp (buf, "State:", 6) == 0) | |
1278 | { | |
1279 | have_state = 1; | |
1280 | break; | |
1281 | } | |
1282 | } | |
1283 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1284 | retval = 1; | |
1285 | fclose (status_file); | |
1286 | } | |
1287 | return retval; | |
1288 | } | |
1289 | ||
1290 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1291 | Returns a wait status for that LWP, to cache. */ | |
1292 | ||
1293 | static int | |
1294 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1295 | int *signalled) | |
1296 | { | |
1297 | pid_t new_pid, pid = GET_LWP (ptid); | |
1298 | int status; | |
1299 | ||
1300 | if (pid_is_stopped (pid)) | |
1301 | { | |
1302 | if (debug_linux_nat) | |
1303 | fprintf_unfiltered (gdb_stdlog, | |
1304 | "LNPAW: Attaching to a stopped process\n"); | |
1305 | ||
1306 | /* The process is definitely stopped. It is in a job control | |
1307 | stop, unless the kernel predates the TASK_STOPPED / | |
1308 | TASK_TRACED distinction, in which case it might be in a | |
1309 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1310 | can kill it, signal it, et cetera. | |
1311 | ||
1312 | First make sure there is a pending SIGSTOP. Since we are | |
1313 | already attached, the process can not transition from stopped | |
1314 | to running without a PTRACE_CONT; so we know this signal will | |
1315 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1316 | probably already in the queue (unless this kernel is old | |
1317 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1318 | is not an RT signal, it can only be queued once. */ | |
1319 | kill_lwp (pid, SIGSTOP); | |
1320 | ||
1321 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1322 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1323 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1324 | } | |
1325 | ||
1326 | /* Make sure the initial process is stopped. The user-level threads | |
1327 | layer might want to poke around in the inferior, and that won't | |
1328 | work if things haven't stabilized yet. */ | |
1329 | new_pid = my_waitpid (pid, &status, 0); | |
1330 | if (new_pid == -1 && errno == ECHILD) | |
1331 | { | |
1332 | if (first) | |
1333 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1334 | ||
1335 | /* Try again with __WCLONE to check cloned processes. */ | |
1336 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1337 | *cloned = 1; | |
1338 | } | |
1339 | ||
1340 | gdb_assert (pid == new_pid && WIFSTOPPED (status)); | |
1341 | ||
1342 | if (WSTOPSIG (status) != SIGSTOP) | |
1343 | { | |
1344 | *signalled = 1; | |
1345 | if (debug_linux_nat) | |
1346 | fprintf_unfiltered (gdb_stdlog, | |
1347 | "LNPAW: Received %s after attaching\n", | |
1348 | status_to_str (status)); | |
1349 | } | |
1350 | ||
1351 | return status; | |
1352 | } | |
1353 | ||
1354 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1355 | if the new LWP could not be attached. */ | |
d6b0e80f | 1356 | |
9ee57c33 | 1357 | int |
93815fbf | 1358 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1359 | { |
9ee57c33 | 1360 | struct lwp_info *lp; |
7feb7d06 | 1361 | sigset_t prev_mask; |
d6b0e80f AC |
1362 | |
1363 | gdb_assert (is_lwp (ptid)); | |
1364 | ||
7feb7d06 | 1365 | block_child_signals (&prev_mask); |
d6b0e80f | 1366 | |
9ee57c33 | 1367 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1368 | |
1369 | /* We assume that we're already attached to any LWP that has an id | |
1370 | equal to the overall process id, and to any LWP that is already | |
1371 | in our list of LWPs. If we're not seeing exit events from threads | |
1372 | and we've had PID wraparound since we last tried to stop all threads, | |
1373 | this assumption might be wrong; fortunately, this is very unlikely | |
1374 | to happen. */ | |
9ee57c33 | 1375 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1376 | { |
a0ef4274 | 1377 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1378 | |
1379 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1380 | { |
1381 | /* If we fail to attach to the thread, issue a warning, | |
1382 | but continue. One way this can happen is if thread | |
e9efe249 | 1383 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1384 | bug may place threads in the thread list and then fail |
1385 | to create them. */ | |
1386 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1387 | safe_strerror (errno)); | |
7feb7d06 | 1388 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1389 | return -1; |
1390 | } | |
1391 | ||
d6b0e80f AC |
1392 | if (debug_linux_nat) |
1393 | fprintf_unfiltered (gdb_stdlog, | |
1394 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1395 | target_pid_to_str (ptid)); | |
1396 | ||
a0ef4274 DJ |
1397 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
1398 | lp = add_lwp (ptid); | |
1399 | lp->stopped = 1; | |
1400 | lp->cloned = cloned; | |
1401 | lp->signalled = signalled; | |
1402 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1403 | { |
a0ef4274 DJ |
1404 | lp->resumed = 1; |
1405 | lp->status = status; | |
d6b0e80f AC |
1406 | } |
1407 | ||
a0ef4274 | 1408 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1409 | |
1410 | if (debug_linux_nat) | |
1411 | { | |
1412 | fprintf_unfiltered (gdb_stdlog, | |
1413 | "LLAL: waitpid %s received %s\n", | |
1414 | target_pid_to_str (ptid), | |
1415 | status_to_str (status)); | |
1416 | } | |
1417 | } | |
1418 | else | |
1419 | { | |
1420 | /* We assume that the LWP representing the original process is | |
1421 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1422 | that the GNU/linux ptrace layer uses to keep track of |
1423 | threads. Note that this won't have already been done since | |
1424 | the main thread will have, we assume, been stopped by an | |
1425 | attach from a different layer. */ | |
9ee57c33 DJ |
1426 | if (lp == NULL) |
1427 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1428 | lp->stopped = 1; |
1429 | } | |
9ee57c33 | 1430 | |
7feb7d06 | 1431 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1432 | return 0; |
d6b0e80f AC |
1433 | } |
1434 | ||
b84876c2 | 1435 | static void |
136d6dae VP |
1436 | linux_nat_create_inferior (struct target_ops *ops, |
1437 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1438 | int from_tty) |
1439 | { | |
10568435 JK |
1440 | #ifdef HAVE_PERSONALITY |
1441 | int personality_orig = 0, personality_set = 0; | |
1442 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1443 | |
1444 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1445 | we have to mask the async mode. */ | |
1446 | ||
10568435 JK |
1447 | #ifdef HAVE_PERSONALITY |
1448 | if (disable_randomization) | |
1449 | { | |
1450 | errno = 0; | |
1451 | personality_orig = personality (0xffffffff); | |
1452 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1453 | { | |
1454 | personality_set = 1; | |
1455 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1456 | } | |
1457 | if (errno != 0 || (personality_set | |
1458 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1459 | warning (_("Error disabling address space randomization: %s"), | |
1460 | safe_strerror (errno)); | |
1461 | } | |
1462 | #endif /* HAVE_PERSONALITY */ | |
1463 | ||
136d6dae | 1464 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1465 | |
10568435 JK |
1466 | #ifdef HAVE_PERSONALITY |
1467 | if (personality_set) | |
1468 | { | |
1469 | errno = 0; | |
1470 | personality (personality_orig); | |
1471 | if (errno != 0) | |
1472 | warning (_("Error restoring address space randomization: %s"), | |
1473 | safe_strerror (errno)); | |
1474 | } | |
1475 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1476 | } |
1477 | ||
d6b0e80f | 1478 | static void |
136d6dae | 1479 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1480 | { |
1481 | struct lwp_info *lp; | |
d6b0e80f | 1482 | int status; |
af990527 | 1483 | ptid_t ptid; |
d6b0e80f | 1484 | |
136d6dae | 1485 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1486 | |
af990527 PA |
1487 | /* The ptrace base target adds the main thread with (pid,0,0) |
1488 | format. Decorate it with lwp info. */ | |
1489 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1490 | thread_change_ptid (inferior_ptid, ptid); | |
1491 | ||
9f0bdab8 | 1492 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1493 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1494 | |
1495 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1496 | &lp->signalled); | |
1497 | lp->stopped = 1; | |
9f0bdab8 | 1498 | |
a0ef4274 | 1499 | /* Save the wait status to report later. */ |
d6b0e80f | 1500 | lp->resumed = 1; |
a0ef4274 DJ |
1501 | if (debug_linux_nat) |
1502 | fprintf_unfiltered (gdb_stdlog, | |
1503 | "LNA: waitpid %ld, saving status %s\n", | |
1504 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1505 | |
7feb7d06 PA |
1506 | lp->status = status; |
1507 | ||
1508 | if (target_can_async_p ()) | |
1509 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1510 | } |
1511 | ||
a0ef4274 DJ |
1512 | /* Get pending status of LP. */ |
1513 | static int | |
1514 | get_pending_status (struct lwp_info *lp, int *status) | |
1515 | { | |
1516 | struct target_waitstatus last; | |
1517 | ptid_t last_ptid; | |
1518 | ||
1519 | get_last_target_status (&last_ptid, &last); | |
1520 | ||
1521 | /* If this lwp is the ptid that GDB is processing an event from, the | |
7feb7d06 PA |
1522 | signal will be in stop_signal. Otherwise, we may cache pending |
1523 | events in lp->status while trying to stop all threads (see | |
1524 | stop_wait_callback). */ | |
a0ef4274 DJ |
1525 | |
1526 | *status = 0; | |
4c28f408 PA |
1527 | |
1528 | if (non_stop) | |
a0ef4274 | 1529 | { |
4c28f408 PA |
1530 | enum target_signal signo = TARGET_SIGNAL_0; |
1531 | ||
1532 | if (is_executing (lp->ptid)) | |
1533 | { | |
1534 | /* If the core thought this lwp was executing --- e.g., the | |
1535 | executing property hasn't been updated yet, but the | |
1536 | thread has been stopped with a stop_callback / | |
1537 | stop_wait_callback sequence (see linux_nat_detach for | |
1538 | example) --- we can only have pending events in the local | |
1539 | queue. */ | |
7feb7d06 | 1540 | signo = target_signal_from_host (WSTOPSIG (lp->status)); |
4c28f408 PA |
1541 | } |
1542 | else | |
1543 | { | |
1544 | /* If the core knows the thread is not executing, then we | |
1545 | have the last signal recorded in | |
2020b7ab | 1546 | thread_info->stop_signal. */ |
4c28f408 | 1547 | |
e09875d4 | 1548 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
2020b7ab | 1549 | signo = tp->stop_signal; |
4c28f408 PA |
1550 | } |
1551 | ||
1552 | if (signo != TARGET_SIGNAL_0 | |
1553 | && !signal_pass_state (signo)) | |
1554 | { | |
1555 | if (debug_linux_nat) | |
1556 | fprintf_unfiltered (gdb_stdlog, "\ | |
1557 | GPT: lwp %s had signal %s, but it is in no pass state\n", | |
1558 | target_pid_to_str (lp->ptid), | |
1559 | target_signal_to_string (signo)); | |
1560 | } | |
1561 | else | |
1562 | { | |
1563 | if (signo != TARGET_SIGNAL_0) | |
1564 | *status = W_STOPCODE (target_signal_to_host (signo)); | |
1565 | ||
1566 | if (debug_linux_nat) | |
1567 | fprintf_unfiltered (gdb_stdlog, | |
1568 | "GPT: lwp %s as pending signal %s\n", | |
1569 | target_pid_to_str (lp->ptid), | |
1570 | target_signal_to_string (signo)); | |
1571 | } | |
a0ef4274 | 1572 | } |
a0ef4274 | 1573 | else |
4c28f408 PA |
1574 | { |
1575 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) | |
1576 | { | |
e09875d4 | 1577 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
2020b7ab PA |
1578 | if (tp->stop_signal != TARGET_SIGNAL_0 |
1579 | && signal_pass_state (tp->stop_signal)) | |
1580 | *status = W_STOPCODE (target_signal_to_host (tp->stop_signal)); | |
4c28f408 | 1581 | } |
4c28f408 PA |
1582 | else |
1583 | *status = lp->status; | |
1584 | } | |
a0ef4274 DJ |
1585 | |
1586 | return 0; | |
1587 | } | |
1588 | ||
d6b0e80f AC |
1589 | static int |
1590 | detach_callback (struct lwp_info *lp, void *data) | |
1591 | { | |
1592 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1593 | ||
1594 | if (debug_linux_nat && lp->status) | |
1595 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1596 | strsignal (WSTOPSIG (lp->status)), | |
1597 | target_pid_to_str (lp->ptid)); | |
1598 | ||
a0ef4274 DJ |
1599 | /* If there is a pending SIGSTOP, get rid of it. */ |
1600 | if (lp->signalled) | |
d6b0e80f | 1601 | { |
d6b0e80f AC |
1602 | if (debug_linux_nat) |
1603 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1604 | "DC: Sending SIGCONT to %s\n", |
1605 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1606 | |
a0ef4274 | 1607 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1608 | lp->signalled = 0; |
d6b0e80f AC |
1609 | } |
1610 | ||
1611 | /* We don't actually detach from the LWP that has an id equal to the | |
1612 | overall process id just yet. */ | |
1613 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1614 | { | |
a0ef4274 DJ |
1615 | int status = 0; |
1616 | ||
1617 | /* Pass on any pending signal for this LWP. */ | |
1618 | get_pending_status (lp, &status); | |
1619 | ||
d6b0e80f AC |
1620 | errno = 0; |
1621 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1622 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1623 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1624 | safe_strerror (errno)); |
1625 | ||
1626 | if (debug_linux_nat) | |
1627 | fprintf_unfiltered (gdb_stdlog, | |
1628 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1629 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1630 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1631 | |
1632 | delete_lwp (lp->ptid); | |
1633 | } | |
1634 | ||
1635 | return 0; | |
1636 | } | |
1637 | ||
1638 | static void | |
136d6dae | 1639 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1640 | { |
b84876c2 | 1641 | int pid; |
a0ef4274 DJ |
1642 | int status; |
1643 | enum target_signal sig; | |
d90e17a7 PA |
1644 | struct lwp_info *main_lwp; |
1645 | ||
1646 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1647 | |
b84876c2 PA |
1648 | if (target_can_async_p ()) |
1649 | linux_nat_async (NULL, 0); | |
1650 | ||
4c28f408 PA |
1651 | /* Stop all threads before detaching. ptrace requires that the |
1652 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1653 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1654 | /* ... and wait until all of them have reported back that |
1655 | they're no longer running. */ | |
d90e17a7 | 1656 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1657 | |
d90e17a7 | 1658 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1659 | |
1660 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1661 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1662 | ||
1663 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1664 | |
a0ef4274 DJ |
1665 | /* Pass on any pending signal for the last LWP. */ |
1666 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1667 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1668 | && WIFSTOPPED (status)) |
1669 | { | |
1670 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1671 | pass it along with PTRACE_DETACH. */ | |
1672 | args = alloca (8); | |
1673 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
1674 | fprintf_unfiltered (gdb_stdlog, | |
1675 | "LND: Sending signal %s to %s\n", | |
1676 | args, | |
d90e17a7 | 1677 | target_pid_to_str (main_lwp->ptid)); |
a0ef4274 DJ |
1678 | } |
1679 | ||
d90e17a7 | 1680 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1681 | |
7a7d3353 PA |
1682 | if (forks_exist_p ()) |
1683 | { | |
1684 | /* Multi-fork case. The current inferior_ptid is being detached | |
1685 | from, but there are other viable forks to debug. Detach from | |
1686 | the current fork, and context-switch to the first | |
1687 | available. */ | |
1688 | linux_fork_detach (args, from_tty); | |
1689 | ||
1690 | if (non_stop && target_can_async_p ()) | |
1691 | target_async (inferior_event_handler, 0); | |
1692 | } | |
1693 | else | |
1694 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1695 | } |
1696 | ||
1697 | /* Resume LP. */ | |
1698 | ||
1699 | static int | |
1700 | resume_callback (struct lwp_info *lp, void *data) | |
1701 | { | |
1702 | if (lp->stopped && lp->status == 0) | |
1703 | { | |
d90e17a7 PA |
1704 | if (debug_linux_nat) |
1705 | fprintf_unfiltered (gdb_stdlog, | |
1706 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", | |
1707 | target_pid_to_str (lp->ptid)); | |
1708 | ||
28439f5e PA |
1709 | linux_ops->to_resume (linux_ops, |
1710 | pid_to_ptid (GET_LWP (lp->ptid)), | |
10d6c8cd | 1711 | 0, TARGET_SIGNAL_0); |
d6b0e80f AC |
1712 | if (debug_linux_nat) |
1713 | fprintf_unfiltered (gdb_stdlog, | |
1714 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1715 | target_pid_to_str (lp->ptid)); | |
1716 | lp->stopped = 0; | |
1717 | lp->step = 0; | |
9f0bdab8 | 1718 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
d6b0e80f | 1719 | } |
57380f4e DJ |
1720 | else if (lp->stopped && debug_linux_nat) |
1721 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (has pending)\n", | |
1722 | target_pid_to_str (lp->ptid)); | |
1723 | else if (debug_linux_nat) | |
1724 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (not stopped)\n", | |
1725 | target_pid_to_str (lp->ptid)); | |
d6b0e80f AC |
1726 | |
1727 | return 0; | |
1728 | } | |
1729 | ||
1730 | static int | |
1731 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1732 | { | |
1733 | lp->resumed = 0; | |
1734 | return 0; | |
1735 | } | |
1736 | ||
1737 | static int | |
1738 | resume_set_callback (struct lwp_info *lp, void *data) | |
1739 | { | |
1740 | lp->resumed = 1; | |
1741 | return 0; | |
1742 | } | |
1743 | ||
1744 | static void | |
28439f5e PA |
1745 | linux_nat_resume (struct target_ops *ops, |
1746 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1747 | { |
7feb7d06 | 1748 | sigset_t prev_mask; |
d6b0e80f | 1749 | struct lwp_info *lp; |
d90e17a7 | 1750 | int resume_many; |
d6b0e80f | 1751 | |
76f50ad1 DJ |
1752 | if (debug_linux_nat) |
1753 | fprintf_unfiltered (gdb_stdlog, | |
1754 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1755 | step ? "step" : "resume", | |
1756 | target_pid_to_str (ptid), | |
1757 | signo ? strsignal (signo) : "0", | |
1758 | target_pid_to_str (inferior_ptid)); | |
1759 | ||
7feb7d06 | 1760 | block_child_signals (&prev_mask); |
b84876c2 | 1761 | |
d6b0e80f | 1762 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1763 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1764 | || ptid_is_pid (ptid)); | |
4c28f408 PA |
1765 | |
1766 | if (!non_stop) | |
1767 | { | |
d90e17a7 PA |
1768 | /* Mark the lwps we're resuming as resumed. */ |
1769 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
1770 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
4c28f408 | 1771 | } |
d90e17a7 PA |
1772 | else |
1773 | iterate_over_lwps (minus_one_ptid, resume_set_callback, NULL); | |
d6b0e80f | 1774 | |
d90e17a7 PA |
1775 | /* See if it's the current inferior that should be handled |
1776 | specially. */ | |
1777 | if (resume_many) | |
1778 | lp = find_lwp_pid (inferior_ptid); | |
1779 | else | |
1780 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1781 | gdb_assert (lp != NULL); |
d6b0e80f | 1782 | |
9f0bdab8 DJ |
1783 | /* Remember if we're stepping. */ |
1784 | lp->step = step; | |
d6b0e80f | 1785 | |
9f0bdab8 DJ |
1786 | /* If we have a pending wait status for this thread, there is no |
1787 | point in resuming the process. But first make sure that | |
1788 | linux_nat_wait won't preemptively handle the event - we | |
1789 | should never take this short-circuit if we are going to | |
1790 | leave LP running, since we have skipped resuming all the | |
1791 | other threads. This bit of code needs to be synchronized | |
1792 | with linux_nat_wait. */ | |
76f50ad1 | 1793 | |
9f0bdab8 DJ |
1794 | if (lp->status && WIFSTOPPED (lp->status)) |
1795 | { | |
d6b48e9c PA |
1796 | int saved_signo; |
1797 | struct inferior *inf; | |
76f50ad1 | 1798 | |
d90e17a7 | 1799 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); |
d6b48e9c PA |
1800 | gdb_assert (inf); |
1801 | saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1802 | ||
1803 | /* Defer to common code if we're gaining control of the | |
1804 | inferior. */ | |
1805 | if (inf->stop_soon == NO_STOP_QUIETLY | |
1806 | && signal_stop_state (saved_signo) == 0 | |
9f0bdab8 DJ |
1807 | && signal_print_state (saved_signo) == 0 |
1808 | && signal_pass_state (saved_signo) == 1) | |
d6b0e80f | 1809 | { |
9f0bdab8 DJ |
1810 | if (debug_linux_nat) |
1811 | fprintf_unfiltered (gdb_stdlog, | |
1812 | "LLR: Not short circuiting for ignored " | |
1813 | "status 0x%x\n", lp->status); | |
1814 | ||
d6b0e80f AC |
1815 | /* FIXME: What should we do if we are supposed to continue |
1816 | this thread with a signal? */ | |
1817 | gdb_assert (signo == TARGET_SIGNAL_0); | |
9f0bdab8 DJ |
1818 | signo = saved_signo; |
1819 | lp->status = 0; | |
1820 | } | |
1821 | } | |
76f50ad1 | 1822 | |
9f0bdab8 DJ |
1823 | if (lp->status) |
1824 | { | |
1825 | /* FIXME: What should we do if we are supposed to continue | |
1826 | this thread with a signal? */ | |
1827 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1828 | |
9f0bdab8 DJ |
1829 | if (debug_linux_nat) |
1830 | fprintf_unfiltered (gdb_stdlog, | |
1831 | "LLR: Short circuiting for status 0x%x\n", | |
1832 | lp->status); | |
d6b0e80f | 1833 | |
7feb7d06 PA |
1834 | restore_child_signals_mask (&prev_mask); |
1835 | if (target_can_async_p ()) | |
1836 | { | |
1837 | target_async (inferior_event_handler, 0); | |
1838 | /* Tell the event loop we have something to process. */ | |
1839 | async_file_mark (); | |
1840 | } | |
9f0bdab8 | 1841 | return; |
d6b0e80f AC |
1842 | } |
1843 | ||
9f0bdab8 DJ |
1844 | /* Mark LWP as not stopped to prevent it from being continued by |
1845 | resume_callback. */ | |
1846 | lp->stopped = 0; | |
1847 | ||
d90e17a7 PA |
1848 | if (resume_many) |
1849 | iterate_over_lwps (ptid, resume_callback, NULL); | |
1850 | ||
1851 | /* Convert to something the lower layer understands. */ | |
1852 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 1853 | |
28439f5e | 1854 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 DJ |
1855 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
1856 | ||
d6b0e80f AC |
1857 | if (debug_linux_nat) |
1858 | fprintf_unfiltered (gdb_stdlog, | |
1859 | "LLR: %s %s, %s (resume event thread)\n", | |
1860 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1861 | target_pid_to_str (ptid), | |
1862 | signo ? strsignal (signo) : "0"); | |
b84876c2 | 1863 | |
7feb7d06 | 1864 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 1865 | if (target_can_async_p ()) |
8ea051c5 | 1866 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1867 | } |
1868 | ||
1869 | /* Issue kill to specified lwp. */ | |
1870 | ||
1871 | static int tkill_failed; | |
1872 | ||
1873 | static int | |
1874 | kill_lwp (int lwpid, int signo) | |
1875 | { | |
1876 | errno = 0; | |
1877 | ||
1878 | /* Use tkill, if possible, in case we are using nptl threads. If tkill | |
1879 | fails, then we are not using nptl threads and we should be using kill. */ | |
1880 | ||
1881 | #ifdef HAVE_TKILL_SYSCALL | |
1882 | if (!tkill_failed) | |
1883 | { | |
1884 | int ret = syscall (__NR_tkill, lwpid, signo); | |
1885 | if (errno != ENOSYS) | |
1886 | return ret; | |
1887 | errno = 0; | |
1888 | tkill_failed = 1; | |
1889 | } | |
1890 | #endif | |
1891 | ||
1892 | return kill (lwpid, signo); | |
1893 | } | |
1894 | ||
3d799a95 DJ |
1895 | /* Handle a GNU/Linux extended wait response. If we see a clone |
1896 | event, we need to add the new LWP to our list (and not report the | |
1897 | trap to higher layers). This function returns non-zero if the | |
1898 | event should be ignored and we should wait again. If STOPPING is | |
1899 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
1900 | |
1901 | static int | |
3d799a95 DJ |
1902 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
1903 | int stopping) | |
d6b0e80f | 1904 | { |
3d799a95 DJ |
1905 | int pid = GET_LWP (lp->ptid); |
1906 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
1907 | struct lwp_info *new_lp = NULL; | |
1908 | int event = status >> 16; | |
d6b0e80f | 1909 | |
3d799a95 DJ |
1910 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
1911 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 1912 | { |
3d799a95 DJ |
1913 | unsigned long new_pid; |
1914 | int ret; | |
1915 | ||
1916 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 1917 | |
3d799a95 DJ |
1918 | /* If we haven't already seen the new PID stop, wait for it now. */ |
1919 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
1920 | { | |
1921 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
1922 | hits the SIGSTOP, but we're already attached. */ | |
1923 | ret = my_waitpid (new_pid, &status, | |
1924 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
1925 | if (ret == -1) | |
1926 | perror_with_name (_("waiting for new child")); | |
1927 | else if (ret != new_pid) | |
1928 | internal_error (__FILE__, __LINE__, | |
1929 | _("wait returned unexpected PID %d"), ret); | |
1930 | else if (!WIFSTOPPED (status)) | |
1931 | internal_error (__FILE__, __LINE__, | |
1932 | _("wait returned unexpected status 0x%x"), status); | |
1933 | } | |
1934 | ||
3a3e9ee3 | 1935 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 1936 | |
2277426b PA |
1937 | if (event == PTRACE_EVENT_FORK |
1938 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
1939 | { | |
1940 | struct fork_info *fp; | |
1941 | ||
1942 | /* Handle checkpointing by linux-fork.c here as a special | |
1943 | case. We don't want the follow-fork-mode or 'catch fork' | |
1944 | to interfere with this. */ | |
1945 | ||
1946 | /* This won't actually modify the breakpoint list, but will | |
1947 | physically remove the breakpoints from the child. */ | |
1948 | detach_breakpoints (new_pid); | |
1949 | ||
1950 | /* Retain child fork in ptrace (stopped) state. */ | |
1951 | fp = find_fork_pid (new_pid); | |
1952 | if (!fp) | |
1953 | fp = add_fork (new_pid); | |
1954 | ||
1955 | /* Report as spurious, so that infrun doesn't want to follow | |
1956 | this fork. We're actually doing an infcall in | |
1957 | linux-fork.c. */ | |
1958 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
1959 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
1960 | ||
1961 | /* Report the stop to the core. */ | |
1962 | return 0; | |
1963 | } | |
1964 | ||
3d799a95 DJ |
1965 | if (event == PTRACE_EVENT_FORK) |
1966 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
1967 | else if (event == PTRACE_EVENT_VFORK) | |
1968 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 1969 | else |
3d799a95 | 1970 | { |
4c28f408 PA |
1971 | struct cleanup *old_chain; |
1972 | ||
3d799a95 | 1973 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
d90e17a7 | 1974 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 1975 | new_lp->cloned = 1; |
4c28f408 | 1976 | new_lp->stopped = 1; |
d6b0e80f | 1977 | |
3d799a95 DJ |
1978 | if (WSTOPSIG (status) != SIGSTOP) |
1979 | { | |
1980 | /* This can happen if someone starts sending signals to | |
1981 | the new thread before it gets a chance to run, which | |
1982 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
1983 | This is an unlikely case, and harder to handle for | |
1984 | fork / vfork than for clone, so we do not try - but | |
1985 | we handle it for clone events here. We'll send | |
1986 | the other signal on to the thread below. */ | |
1987 | ||
1988 | new_lp->signalled = 1; | |
1989 | } | |
1990 | else | |
1991 | status = 0; | |
d6b0e80f | 1992 | |
4c28f408 | 1993 | if (non_stop) |
3d799a95 | 1994 | { |
4c28f408 PA |
1995 | /* Add the new thread to GDB's lists as soon as possible |
1996 | so that: | |
1997 | ||
1998 | 1) the frontend doesn't have to wait for a stop to | |
1999 | display them, and, | |
2000 | ||
2001 | 2) we tag it with the correct running state. */ | |
2002 | ||
2003 | /* If the thread_db layer is active, let it know about | |
2004 | this new thread, and add it to GDB's list. */ | |
2005 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2006 | { | |
2007 | /* We're not using thread_db. Add it to GDB's | |
2008 | list. */ | |
2009 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2010 | add_thread (new_lp->ptid); | |
2011 | } | |
2012 | ||
2013 | if (!stopping) | |
2014 | { | |
2015 | set_running (new_lp->ptid, 1); | |
2016 | set_executing (new_lp->ptid, 1); | |
2017 | } | |
2018 | } | |
2019 | ||
2020 | if (!stopping) | |
2021 | { | |
2022 | new_lp->stopped = 0; | |
3d799a95 | 2023 | new_lp->resumed = 1; |
4c28f408 | 2024 | ptrace (PTRACE_CONT, new_pid, 0, |
3d799a95 DJ |
2025 | status ? WSTOPSIG (status) : 0); |
2026 | } | |
d6b0e80f | 2027 | |
3d799a95 DJ |
2028 | if (debug_linux_nat) |
2029 | fprintf_unfiltered (gdb_stdlog, | |
2030 | "LHEW: Got clone event from LWP %ld, resuming\n", | |
2031 | GET_LWP (lp->ptid)); | |
2032 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2033 | ||
2034 | return 1; | |
2035 | } | |
2036 | ||
2037 | return 0; | |
d6b0e80f AC |
2038 | } |
2039 | ||
3d799a95 DJ |
2040 | if (event == PTRACE_EVENT_EXEC) |
2041 | { | |
a75724bc PA |
2042 | if (debug_linux_nat) |
2043 | fprintf_unfiltered (gdb_stdlog, | |
2044 | "LHEW: Got exec event from LWP %ld\n", | |
2045 | GET_LWP (lp->ptid)); | |
2046 | ||
3d799a95 DJ |
2047 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2048 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2049 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 DJ |
2050 | |
2051 | if (linux_parent_pid) | |
2052 | { | |
2053 | detach_breakpoints (linux_parent_pid); | |
2054 | ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0); | |
2055 | ||
2056 | linux_parent_pid = 0; | |
2057 | } | |
2058 | ||
25b22b0a PA |
2059 | /* At this point, all inserted breakpoints are gone. Doing this |
2060 | as soon as we detect an exec prevents the badness of deleting | |
2061 | a breakpoint writing the current "shadow contents" to lift | |
2062 | the bp. That shadow is NOT valid after an exec. | |
2063 | ||
2064 | Note that we have to do this after the detach_breakpoints | |
2065 | call above, otherwise breakpoints wouldn't be lifted from the | |
2066 | parent on a vfork, because detach_breakpoints would think | |
2067 | that breakpoints are not inserted. */ | |
2068 | mark_breakpoints_out (); | |
3d799a95 DJ |
2069 | return 0; |
2070 | } | |
2071 | ||
a96d9b2e SDJ |
2072 | /* Used for 'catch syscall' feature. */ |
2073 | if (WSTOPSIG (status) == TRAP_IS_SYSCALL) | |
2074 | { | |
2075 | if (catch_syscall_enabled () == 0) | |
2076 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2077 | else | |
2078 | { | |
2079 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
2080 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2081 | ||
2082 | ourstatus->value.syscall_number = | |
2083 | (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2084 | ||
2085 | /* If we are catching this specific syscall number, then we | |
2086 | should update the target_status to reflect which event | |
2087 | has occurred. But if this syscall is not to be caught, | |
2088 | then we can safely mark the event as a SYSCALL_RETURN. | |
2089 | ||
2090 | This is particularly needed if: | |
2091 | ||
2092 | - We are catching any syscalls, or | |
2093 | - We are catching the syscall "exit" | |
2094 | ||
2095 | In this case, as the syscall "exit" *doesn't* return, | |
2096 | then GDB would be confused because it would mark the last | |
2097 | syscall event as a SYSCALL_ENTRY. After that, if we re-ran the | |
2098 | inferior GDB will think that the first syscall event is | |
2099 | the opposite of a SYSCALL_ENTRY, which is the SYSCALL_RETURN. | |
2100 | Therefore, GDB would report inverted syscall events. */ | |
2101 | if (catching_syscall_number (ourstatus->value.syscall_number)) | |
2102 | ourstatus->kind = | |
2103 | (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY) ? | |
2104 | TARGET_WAITKIND_SYSCALL_RETURN : TARGET_WAITKIND_SYSCALL_ENTRY; | |
2105 | else | |
2106 | ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
2107 | ||
2108 | lp->syscall_state = ourstatus->kind; | |
2109 | } | |
2110 | return 0; | |
2111 | } | |
2112 | ||
3d799a95 DJ |
2113 | internal_error (__FILE__, __LINE__, |
2114 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2115 | } |
2116 | ||
2117 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
2118 | exited. */ | |
2119 | ||
2120 | static int | |
2121 | wait_lwp (struct lwp_info *lp) | |
2122 | { | |
2123 | pid_t pid; | |
2124 | int status; | |
2125 | int thread_dead = 0; | |
2126 | ||
2127 | gdb_assert (!lp->stopped); | |
2128 | gdb_assert (lp->status == 0); | |
2129 | ||
58aecb61 | 2130 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
2131 | if (pid == -1 && errno == ECHILD) |
2132 | { | |
58aecb61 | 2133 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
2134 | if (pid == -1 && errno == ECHILD) |
2135 | { | |
2136 | /* The thread has previously exited. We need to delete it | |
2137 | now because, for some vendor 2.4 kernels with NPTL | |
2138 | support backported, there won't be an exit event unless | |
2139 | it is the main thread. 2.6 kernels will report an exit | |
2140 | event for each thread that exits, as expected. */ | |
2141 | thread_dead = 1; | |
2142 | if (debug_linux_nat) | |
2143 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2144 | target_pid_to_str (lp->ptid)); | |
2145 | } | |
2146 | } | |
2147 | ||
2148 | if (!thread_dead) | |
2149 | { | |
2150 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2151 | ||
2152 | if (debug_linux_nat) | |
2153 | { | |
2154 | fprintf_unfiltered (gdb_stdlog, | |
2155 | "WL: waitpid %s received %s\n", | |
2156 | target_pid_to_str (lp->ptid), | |
2157 | status_to_str (status)); | |
2158 | } | |
2159 | } | |
2160 | ||
2161 | /* Check if the thread has exited. */ | |
2162 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2163 | { | |
2164 | thread_dead = 1; | |
2165 | if (debug_linux_nat) | |
2166 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2167 | target_pid_to_str (lp->ptid)); | |
2168 | } | |
2169 | ||
2170 | if (thread_dead) | |
2171 | { | |
e26af52f | 2172 | exit_lwp (lp); |
d6b0e80f AC |
2173 | return 0; |
2174 | } | |
2175 | ||
2176 | gdb_assert (WIFSTOPPED (status)); | |
2177 | ||
2178 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
2179 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2180 | { | |
2181 | if (debug_linux_nat) | |
2182 | fprintf_unfiltered (gdb_stdlog, | |
2183 | "WL: Handling extended status 0x%06x\n", | |
2184 | status); | |
3d799a95 | 2185 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2186 | return wait_lwp (lp); |
2187 | } | |
2188 | ||
2189 | return status; | |
2190 | } | |
2191 | ||
9f0bdab8 DJ |
2192 | /* Save the most recent siginfo for LP. This is currently only called |
2193 | for SIGTRAP; some ports use the si_addr field for | |
2194 | target_stopped_data_address. In the future, it may also be used to | |
2195 | restore the siginfo of requeued signals. */ | |
2196 | ||
2197 | static void | |
2198 | save_siginfo (struct lwp_info *lp) | |
2199 | { | |
2200 | errno = 0; | |
2201 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2202 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2203 | ||
2204 | if (errno != 0) | |
2205 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2206 | } | |
2207 | ||
d6b0e80f AC |
2208 | /* Send a SIGSTOP to LP. */ |
2209 | ||
2210 | static int | |
2211 | stop_callback (struct lwp_info *lp, void *data) | |
2212 | { | |
2213 | if (!lp->stopped && !lp->signalled) | |
2214 | { | |
2215 | int ret; | |
2216 | ||
2217 | if (debug_linux_nat) | |
2218 | { | |
2219 | fprintf_unfiltered (gdb_stdlog, | |
2220 | "SC: kill %s **<SIGSTOP>**\n", | |
2221 | target_pid_to_str (lp->ptid)); | |
2222 | } | |
2223 | errno = 0; | |
2224 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2225 | if (debug_linux_nat) | |
2226 | { | |
2227 | fprintf_unfiltered (gdb_stdlog, | |
2228 | "SC: lwp kill %d %s\n", | |
2229 | ret, | |
2230 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2231 | } | |
2232 | ||
2233 | lp->signalled = 1; | |
2234 | gdb_assert (lp->status == 0); | |
2235 | } | |
2236 | ||
2237 | return 0; | |
2238 | } | |
2239 | ||
57380f4e | 2240 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2241 | |
2242 | static int | |
57380f4e DJ |
2243 | linux_nat_has_pending_sigint (int pid) |
2244 | { | |
2245 | sigset_t pending, blocked, ignored; | |
2246 | int i; | |
2247 | ||
2248 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2249 | ||
2250 | if (sigismember (&pending, SIGINT) | |
2251 | && !sigismember (&ignored, SIGINT)) | |
2252 | return 1; | |
2253 | ||
2254 | return 0; | |
2255 | } | |
2256 | ||
2257 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2258 | ||
2259 | static int | |
2260 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2261 | { |
57380f4e DJ |
2262 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2263 | flag to consume the next one. */ | |
2264 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2265 | && WSTOPSIG (lp->status) == SIGINT) | |
2266 | lp->status = 0; | |
2267 | else | |
2268 | lp->ignore_sigint = 1; | |
2269 | ||
2270 | return 0; | |
2271 | } | |
2272 | ||
2273 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2274 | This function is called after we know the LWP has stopped; if the LWP | |
2275 | stopped before the expected SIGINT was delivered, then it will never have | |
2276 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2277 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2278 | |
57380f4e DJ |
2279 | static void |
2280 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2281 | { | |
2282 | if (!lp->ignore_sigint) | |
2283 | return; | |
2284 | ||
2285 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2286 | { | |
2287 | if (debug_linux_nat) | |
2288 | fprintf_unfiltered (gdb_stdlog, | |
2289 | "MCIS: Clearing bogus flag for %s\n", | |
2290 | target_pid_to_str (lp->ptid)); | |
2291 | lp->ignore_sigint = 0; | |
2292 | } | |
2293 | } | |
2294 | ||
2295 | /* Wait until LP is stopped. */ | |
2296 | ||
2297 | static int | |
2298 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2299 | { | |
d6b0e80f AC |
2300 | if (!lp->stopped) |
2301 | { | |
2302 | int status; | |
2303 | ||
2304 | status = wait_lwp (lp); | |
2305 | if (status == 0) | |
2306 | return 0; | |
2307 | ||
57380f4e DJ |
2308 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2309 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2310 | { |
57380f4e | 2311 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2312 | |
2313 | errno = 0; | |
2314 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2315 | if (debug_linux_nat) | |
2316 | fprintf_unfiltered (gdb_stdlog, | |
57380f4e | 2317 | "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n", |
d6b0e80f AC |
2318 | target_pid_to_str (lp->ptid), |
2319 | errno ? safe_strerror (errno) : "OK"); | |
2320 | ||
57380f4e | 2321 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2322 | } |
2323 | ||
57380f4e DJ |
2324 | maybe_clear_ignore_sigint (lp); |
2325 | ||
d6b0e80f AC |
2326 | if (WSTOPSIG (status) != SIGSTOP) |
2327 | { | |
2328 | if (WSTOPSIG (status) == SIGTRAP) | |
2329 | { | |
2330 | /* If a LWP other than the LWP that we're reporting an | |
2331 | event for has hit a GDB breakpoint (as opposed to | |
2332 | some random trap signal), then just arrange for it to | |
2333 | hit it again later. We don't keep the SIGTRAP status | |
2334 | and don't forward the SIGTRAP signal to the LWP. We | |
2335 | will handle the current event, eventually we will | |
2336 | resume all LWPs, and this one will get its breakpoint | |
2337 | trap again. | |
2338 | ||
2339 | If we do not do this, then we run the risk that the | |
2340 | user will delete or disable the breakpoint, but the | |
2341 | thread will have already tripped on it. */ | |
2342 | ||
9f0bdab8 DJ |
2343 | /* Save the trap's siginfo in case we need it later. */ |
2344 | save_siginfo (lp); | |
2345 | ||
d6b0e80f AC |
2346 | /* Now resume this LWP and get the SIGSTOP event. */ |
2347 | errno = 0; | |
2348 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2349 | if (debug_linux_nat) | |
2350 | { | |
2351 | fprintf_unfiltered (gdb_stdlog, | |
2352 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2353 | target_pid_to_str (lp->ptid), | |
2354 | errno ? safe_strerror (errno) : "OK"); | |
2355 | ||
2356 | fprintf_unfiltered (gdb_stdlog, | |
2357 | "SWC: Candidate SIGTRAP event in %s\n", | |
2358 | target_pid_to_str (lp->ptid)); | |
2359 | } | |
710151dd PA |
2360 | /* Hold this event/waitstatus while we check to see if |
2361 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2362 | stop_wait_callback (lp, NULL); |
710151dd | 2363 | |
7feb7d06 PA |
2364 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2365 | there's another event, throw it back into the | |
2366 | queue. */ | |
2367 | if (lp->status) | |
710151dd | 2368 | { |
7feb7d06 PA |
2369 | if (debug_linux_nat) |
2370 | fprintf_unfiltered (gdb_stdlog, | |
2371 | "SWC: kill %s, %s\n", | |
2372 | target_pid_to_str (lp->ptid), | |
2373 | status_to_str ((int) status)); | |
2374 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2375 | } |
7feb7d06 PA |
2376 | |
2377 | /* Save the sigtrap event. */ | |
2378 | lp->status = status; | |
d6b0e80f AC |
2379 | return 0; |
2380 | } | |
2381 | else | |
2382 | { | |
2383 | /* The thread was stopped with a signal other than | |
2384 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
2385 | ||
2386 | if (debug_linux_nat) | |
2387 | { | |
2388 | fprintf_unfiltered (gdb_stdlog, | |
2389 | "SWC: Pending event %s in %s\n", | |
2390 | status_to_str ((int) status), | |
2391 | target_pid_to_str (lp->ptid)); | |
2392 | } | |
2393 | /* Now resume this LWP and get the SIGSTOP event. */ | |
2394 | errno = 0; | |
2395 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2396 | if (debug_linux_nat) | |
2397 | fprintf_unfiltered (gdb_stdlog, | |
2398 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2399 | target_pid_to_str (lp->ptid), | |
2400 | errno ? safe_strerror (errno) : "OK"); | |
2401 | ||
2402 | /* Hold this event/waitstatus while we check to see if | |
2403 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2404 | stop_wait_callback (lp, NULL); |
710151dd PA |
2405 | |
2406 | /* If the lp->status field is still empty, use it to | |
2407 | hold this event. If not, then this event must be | |
2408 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2409 | if (lp->status) |
d6b0e80f AC |
2410 | { |
2411 | if (debug_linux_nat) | |
2412 | { | |
2413 | fprintf_unfiltered (gdb_stdlog, | |
2414 | "SWC: kill %s, %s\n", | |
2415 | target_pid_to_str (lp->ptid), | |
2416 | status_to_str ((int) status)); | |
2417 | } | |
2418 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2419 | } | |
710151dd PA |
2420 | else |
2421 | lp->status = status; | |
d6b0e80f AC |
2422 | return 0; |
2423 | } | |
2424 | } | |
2425 | else | |
2426 | { | |
2427 | /* We caught the SIGSTOP that we intended to catch, so | |
2428 | there's no SIGSTOP pending. */ | |
2429 | lp->stopped = 1; | |
2430 | lp->signalled = 0; | |
2431 | } | |
2432 | } | |
2433 | ||
2434 | return 0; | |
2435 | } | |
2436 | ||
d6b0e80f AC |
2437 | /* Return non-zero if LP has a wait status pending. */ |
2438 | ||
2439 | static int | |
2440 | status_callback (struct lwp_info *lp, void *data) | |
2441 | { | |
2442 | /* Only report a pending wait status if we pretend that this has | |
2443 | indeed been resumed. */ | |
d90e17a7 PA |
2444 | /* We check for lp->waitstatus in addition to lp->status, because we |
2445 | can have pending process exits recorded in lp->waitstatus, and | |
2446 | W_EXITCODE(0,0) == 0. */ | |
2447 | return ((lp->status != 0 | |
2448 | || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2449 | && lp->resumed); | |
d6b0e80f AC |
2450 | } |
2451 | ||
2452 | /* Return non-zero if LP isn't stopped. */ | |
2453 | ||
2454 | static int | |
2455 | running_callback (struct lwp_info *lp, void *data) | |
2456 | { | |
2457 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2458 | } | |
2459 | ||
2460 | /* Count the LWP's that have had events. */ | |
2461 | ||
2462 | static int | |
2463 | count_events_callback (struct lwp_info *lp, void *data) | |
2464 | { | |
2465 | int *count = data; | |
2466 | ||
2467 | gdb_assert (count != NULL); | |
2468 | ||
e09490f1 DJ |
2469 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
2470 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2471 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2472 | (*count)++; | |
2473 | ||
2474 | return 0; | |
2475 | } | |
2476 | ||
2477 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2478 | ||
2479 | static int | |
2480 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2481 | { | |
2482 | if (lp->step && lp->status != 0) | |
2483 | return 1; | |
2484 | else | |
2485 | return 0; | |
2486 | } | |
2487 | ||
2488 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2489 | ||
2490 | static int | |
2491 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2492 | { | |
2493 | int *selector = data; | |
2494 | ||
2495 | gdb_assert (selector != NULL); | |
2496 | ||
e09490f1 DJ |
2497 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
2498 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2499 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2500 | if ((*selector)-- == 0) | |
2501 | return 1; | |
2502 | ||
2503 | return 0; | |
2504 | } | |
2505 | ||
710151dd PA |
2506 | static int |
2507 | cancel_breakpoint (struct lwp_info *lp) | |
2508 | { | |
2509 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2510 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2511 | LWP. We will handle the current event, eventually we will resume | |
2512 | this LWP, and this breakpoint will trap again. | |
2513 | ||
2514 | If we do not do this, then we run the risk that the user will | |
2515 | delete or disable the breakpoint, but the LWP will have already | |
2516 | tripped on it. */ | |
2517 | ||
515630c5 UW |
2518 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2519 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2520 | CORE_ADDR pc; | |
2521 | ||
2522 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
2523 | if (breakpoint_inserted_here_p (pc)) | |
710151dd PA |
2524 | { |
2525 | if (debug_linux_nat) | |
2526 | fprintf_unfiltered (gdb_stdlog, | |
2527 | "CB: Push back breakpoint for %s\n", | |
2528 | target_pid_to_str (lp->ptid)); | |
2529 | ||
2530 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2531 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2532 | regcache_write_pc (regcache, pc); | |
2533 | ||
710151dd PA |
2534 | return 1; |
2535 | } | |
2536 | return 0; | |
2537 | } | |
2538 | ||
d6b0e80f AC |
2539 | static int |
2540 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2541 | { | |
2542 | struct lwp_info *event_lp = data; | |
2543 | ||
2544 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2545 | if (lp == event_lp) | |
2546 | return 0; | |
2547 | ||
2548 | /* If a LWP other than the LWP that we're reporting an event for has | |
2549 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2550 | then just arrange for it to hit it again later. We don't keep | |
2551 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2552 | LWP. We will handle the current event, eventually we will resume | |
2553 | all LWPs, and this one will get its breakpoint trap again. | |
2554 | ||
2555 | If we do not do this, then we run the risk that the user will | |
2556 | delete or disable the breakpoint, but the LWP will have already | |
2557 | tripped on it. */ | |
2558 | ||
2559 | if (lp->status != 0 | |
2560 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP | |
710151dd PA |
2561 | && cancel_breakpoint (lp)) |
2562 | /* Throw away the SIGTRAP. */ | |
2563 | lp->status = 0; | |
d6b0e80f AC |
2564 | |
2565 | return 0; | |
2566 | } | |
2567 | ||
2568 | /* Select one LWP out of those that have events pending. */ | |
2569 | ||
2570 | static void | |
d90e17a7 | 2571 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
2572 | { |
2573 | int num_events = 0; | |
2574 | int random_selector; | |
2575 | struct lwp_info *event_lp; | |
2576 | ||
ac264b3b | 2577 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2578 | (*orig_lp)->status = *status; |
2579 | ||
2580 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
2581 | event_lp = iterate_over_lwps (filter, |
2582 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
2583 | if (event_lp != NULL) |
2584 | { | |
2585 | if (debug_linux_nat) | |
2586 | fprintf_unfiltered (gdb_stdlog, | |
2587 | "SEL: Select single-step %s\n", | |
2588 | target_pid_to_str (event_lp->ptid)); | |
2589 | } | |
2590 | else | |
2591 | { | |
2592 | /* No single-stepping LWP. Select one at random, out of those | |
2593 | which have had SIGTRAP events. */ | |
2594 | ||
2595 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 2596 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
2597 | |
2598 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2599 | random_selector = (int) | |
2600 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2601 | ||
2602 | if (debug_linux_nat && num_events > 1) | |
2603 | fprintf_unfiltered (gdb_stdlog, | |
2604 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2605 | num_events, random_selector); | |
2606 | ||
d90e17a7 PA |
2607 | event_lp = iterate_over_lwps (filter, |
2608 | select_event_lwp_callback, | |
d6b0e80f AC |
2609 | &random_selector); |
2610 | } | |
2611 | ||
2612 | if (event_lp != NULL) | |
2613 | { | |
2614 | /* Switch the event LWP. */ | |
2615 | *orig_lp = event_lp; | |
2616 | *status = event_lp->status; | |
2617 | } | |
2618 | ||
2619 | /* Flush the wait status for the event LWP. */ | |
2620 | (*orig_lp)->status = 0; | |
2621 | } | |
2622 | ||
2623 | /* Return non-zero if LP has been resumed. */ | |
2624 | ||
2625 | static int | |
2626 | resumed_callback (struct lwp_info *lp, void *data) | |
2627 | { | |
2628 | return lp->resumed; | |
2629 | } | |
2630 | ||
d6b0e80f AC |
2631 | /* Stop an active thread, verify it still exists, then resume it. */ |
2632 | ||
2633 | static int | |
2634 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
2635 | { | |
2636 | struct lwp_info *ptr; | |
2637 | ||
2638 | if (!lp->stopped && !lp->signalled) | |
2639 | { | |
2640 | stop_callback (lp, NULL); | |
2641 | stop_wait_callback (lp, NULL); | |
2642 | /* Resume if the lwp still exists. */ | |
2643 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
2644 | if (lp == ptr) | |
2645 | { | |
2646 | resume_callback (lp, NULL); | |
2647 | resume_set_callback (lp, NULL); | |
2648 | } | |
2649 | } | |
2650 | return 0; | |
2651 | } | |
2652 | ||
02f3fc28 | 2653 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 2654 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
2655 | static struct lwp_info * |
2656 | linux_nat_filter_event (int lwpid, int status, int options) | |
2657 | { | |
2658 | struct lwp_info *lp; | |
2659 | ||
2660 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2661 | ||
2662 | /* Check for stop events reported by a process we didn't already | |
2663 | know about - anything not already in our LWP list. | |
2664 | ||
2665 | If we're expecting to receive stopped processes after | |
2666 | fork, vfork, and clone events, then we'll just add the | |
2667 | new one to our list and go back to waiting for the event | |
2668 | to be reported - the stopped process might be returned | |
2669 | from waitpid before or after the event is. */ | |
2670 | if (WIFSTOPPED (status) && !lp) | |
2671 | { | |
2672 | linux_record_stopped_pid (lwpid, status); | |
2673 | return NULL; | |
2674 | } | |
2675 | ||
2676 | /* Make sure we don't report an event for the exit of an LWP not in | |
2677 | our list, i.e. not part of the current process. This can happen | |
2678 | if we detach from a program we original forked and then it | |
2679 | exits. */ | |
2680 | if (!WIFSTOPPED (status) && !lp) | |
2681 | return NULL; | |
2682 | ||
2683 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
2684 | CLONE_PTRACE processes which do not use the thread library - | |
2685 | otherwise we wouldn't find the new LWP this way. That doesn't | |
2686 | currently work, and the following code is currently unreachable | |
2687 | due to the two blocks above. If it's fixed some day, this code | |
2688 | should be broken out into a function so that we can also pick up | |
2689 | LWPs from the new interface. */ | |
2690 | if (!lp) | |
2691 | { | |
2692 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
2693 | if (options & __WCLONE) | |
2694 | lp->cloned = 1; | |
2695 | ||
2696 | gdb_assert (WIFSTOPPED (status) | |
2697 | && WSTOPSIG (status) == SIGSTOP); | |
2698 | lp->signalled = 1; | |
2699 | ||
2700 | if (!in_thread_list (inferior_ptid)) | |
2701 | { | |
2702 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
2703 | GET_PID (inferior_ptid)); | |
2704 | add_thread (inferior_ptid); | |
2705 | } | |
2706 | ||
2707 | add_thread (lp->ptid); | |
2708 | } | |
2709 | ||
2710 | /* Save the trap's siginfo in case we need it later. */ | |
a96d9b2e SDJ |
2711 | if (WIFSTOPPED (status) |
2712 | && (WSTOPSIG (status) == SIGTRAP || WSTOPSIG (status) == TRAP_IS_SYSCALL)) | |
02f3fc28 PA |
2713 | save_siginfo (lp); |
2714 | ||
a96d9b2e SDJ |
2715 | /* Handle GNU/Linux's extended waitstatus for trace events. |
2716 | It is necessary to check if WSTOPSIG is signaling that | |
2717 | the inferior is entering/exiting a system call. */ | |
2718 | if (WIFSTOPPED (status) | |
2719 | && ((WSTOPSIG (status) == TRAP_IS_SYSCALL) | |
2720 | || (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0))) | |
02f3fc28 PA |
2721 | { |
2722 | if (debug_linux_nat) | |
2723 | fprintf_unfiltered (gdb_stdlog, | |
2724 | "LLW: Handling extended status 0x%06x\n", | |
2725 | status); | |
2726 | if (linux_handle_extended_wait (lp, status, 0)) | |
2727 | return NULL; | |
2728 | } | |
2729 | ||
2730 | /* Check if the thread has exited. */ | |
d90e17a7 PA |
2731 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
2732 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 2733 | { |
9db03742 JB |
2734 | /* If this is the main thread, we must stop all threads and verify |
2735 | if they are still alive. This is because in the nptl thread model | |
2736 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
2737 | other than the main thread. We only get the main thread exit |
2738 | signal once all child threads have already exited. If we | |
2739 | stop all the threads and use the stop_wait_callback to check | |
2740 | if they have exited we can determine whether this signal | |
2741 | should be ignored or whether it means the end of the debugged | |
2742 | application, regardless of which threading model is being | |
5d3b6af6 | 2743 | used. */ |
02f3fc28 PA |
2744 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
2745 | { | |
2746 | lp->stopped = 1; | |
d90e17a7 PA |
2747 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
2748 | stop_and_resume_callback, NULL); | |
02f3fc28 PA |
2749 | } |
2750 | ||
2751 | if (debug_linux_nat) | |
2752 | fprintf_unfiltered (gdb_stdlog, | |
2753 | "LLW: %s exited.\n", | |
2754 | target_pid_to_str (lp->ptid)); | |
2755 | ||
d90e17a7 | 2756 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
2757 | { |
2758 | /* If there is at least one more LWP, then the exit signal | |
2759 | was not the end of the debugged application and should be | |
2760 | ignored. */ | |
2761 | exit_lwp (lp); | |
2762 | return NULL; | |
2763 | } | |
02f3fc28 PA |
2764 | } |
2765 | ||
2766 | /* Check if the current LWP has previously exited. In the nptl | |
2767 | thread model, LWPs other than the main thread do not issue | |
2768 | signals when they exit so we must check whenever the thread has | |
2769 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 2770 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 2771 | { |
d90e17a7 PA |
2772 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
2773 | ||
02f3fc28 PA |
2774 | if (debug_linux_nat) |
2775 | fprintf_unfiltered (gdb_stdlog, | |
2776 | "LLW: %s exited.\n", | |
2777 | target_pid_to_str (lp->ptid)); | |
2778 | ||
2779 | exit_lwp (lp); | |
2780 | ||
2781 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 2782 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
2783 | |
2784 | /* Discard the event. */ | |
2785 | return NULL; | |
2786 | } | |
2787 | ||
2788 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
2789 | an attempt to stop an LWP. */ | |
2790 | if (lp->signalled | |
2791 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
2792 | { | |
2793 | if (debug_linux_nat) | |
2794 | fprintf_unfiltered (gdb_stdlog, | |
2795 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
2796 | target_pid_to_str (lp->ptid)); | |
2797 | ||
2798 | /* This is a delayed SIGSTOP. */ | |
2799 | lp->signalled = 0; | |
2800 | ||
2801 | registers_changed (); | |
2802 | ||
28439f5e | 2803 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
02f3fc28 PA |
2804 | lp->step, TARGET_SIGNAL_0); |
2805 | if (debug_linux_nat) | |
2806 | fprintf_unfiltered (gdb_stdlog, | |
2807 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
2808 | lp->step ? | |
2809 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2810 | target_pid_to_str (lp->ptid)); | |
2811 | ||
2812 | lp->stopped = 0; | |
2813 | gdb_assert (lp->resumed); | |
2814 | ||
2815 | /* Discard the event. */ | |
2816 | return NULL; | |
2817 | } | |
2818 | ||
57380f4e DJ |
2819 | /* Make sure we don't report a SIGINT that we have already displayed |
2820 | for another thread. */ | |
2821 | if (lp->ignore_sigint | |
2822 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
2823 | { | |
2824 | if (debug_linux_nat) | |
2825 | fprintf_unfiltered (gdb_stdlog, | |
2826 | "LLW: Delayed SIGINT caught for %s.\n", | |
2827 | target_pid_to_str (lp->ptid)); | |
2828 | ||
2829 | /* This is a delayed SIGINT. */ | |
2830 | lp->ignore_sigint = 0; | |
2831 | ||
2832 | registers_changed (); | |
28439f5e | 2833 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
2834 | lp->step, TARGET_SIGNAL_0); |
2835 | if (debug_linux_nat) | |
2836 | fprintf_unfiltered (gdb_stdlog, | |
2837 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
2838 | lp->step ? | |
2839 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2840 | target_pid_to_str (lp->ptid)); | |
2841 | ||
2842 | lp->stopped = 0; | |
2843 | gdb_assert (lp->resumed); | |
2844 | ||
2845 | /* Discard the event. */ | |
2846 | return NULL; | |
2847 | } | |
2848 | ||
02f3fc28 PA |
2849 | /* An interesting event. */ |
2850 | gdb_assert (lp); | |
2851 | return lp; | |
2852 | } | |
2853 | ||
d6b0e80f | 2854 | static ptid_t |
7feb7d06 | 2855 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
2856 | ptid_t ptid, struct target_waitstatus *ourstatus, |
2857 | int target_options) | |
d6b0e80f | 2858 | { |
7feb7d06 | 2859 | static sigset_t prev_mask; |
d6b0e80f AC |
2860 | struct lwp_info *lp = NULL; |
2861 | int options = 0; | |
2862 | int status = 0; | |
d90e17a7 | 2863 | pid_t pid; |
d6b0e80f | 2864 | |
b84876c2 PA |
2865 | if (debug_linux_nat_async) |
2866 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); | |
2867 | ||
f973ed9c DJ |
2868 | /* The first time we get here after starting a new inferior, we may |
2869 | not have added it to the LWP list yet - this is the earliest | |
2870 | moment at which we know its PID. */ | |
d90e17a7 | 2871 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 2872 | { |
27c9d204 PA |
2873 | /* Upgrade the main thread's ptid. */ |
2874 | thread_change_ptid (inferior_ptid, | |
2875 | BUILD_LWP (GET_PID (inferior_ptid), | |
2876 | GET_PID (inferior_ptid))); | |
2877 | ||
f973ed9c DJ |
2878 | lp = add_lwp (inferior_ptid); |
2879 | lp->resumed = 1; | |
2880 | } | |
2881 | ||
7feb7d06 PA |
2882 | /* Make sure SIGCHLD is blocked. */ |
2883 | block_child_signals (&prev_mask); | |
d6b0e80f | 2884 | |
d90e17a7 PA |
2885 | if (ptid_equal (ptid, minus_one_ptid)) |
2886 | pid = -1; | |
2887 | else if (ptid_is_pid (ptid)) | |
2888 | /* A request to wait for a specific tgid. This is not possible | |
2889 | with waitpid, so instead, we wait for any child, and leave | |
2890 | children we're not interested in right now with a pending | |
2891 | status to report later. */ | |
2892 | pid = -1; | |
2893 | else | |
2894 | pid = GET_LWP (ptid); | |
2895 | ||
d6b0e80f | 2896 | retry: |
d90e17a7 PA |
2897 | lp = NULL; |
2898 | status = 0; | |
d6b0e80f | 2899 | |
f973ed9c | 2900 | /* Make sure there is at least one LWP that has been resumed. */ |
d90e17a7 | 2901 | gdb_assert (iterate_over_lwps (ptid, resumed_callback, NULL)); |
d6b0e80f AC |
2902 | |
2903 | /* First check if there is a LWP with a wait status pending. */ | |
2904 | if (pid == -1) | |
2905 | { | |
2906 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 2907 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
2908 | if (lp) |
2909 | { | |
2910 | status = lp->status; | |
2911 | lp->status = 0; | |
2912 | ||
2913 | if (debug_linux_nat && status) | |
2914 | fprintf_unfiltered (gdb_stdlog, | |
2915 | "LLW: Using pending wait status %s for %s.\n", | |
2916 | status_to_str (status), | |
2917 | target_pid_to_str (lp->ptid)); | |
2918 | } | |
2919 | ||
b84876c2 | 2920 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
2921 | cloned and uncloned processes. We start with the cloned |
2922 | processes. */ | |
d6b0e80f AC |
2923 | options = __WCLONE | WNOHANG; |
2924 | } | |
2925 | else if (is_lwp (ptid)) | |
2926 | { | |
2927 | if (debug_linux_nat) | |
2928 | fprintf_unfiltered (gdb_stdlog, | |
2929 | "LLW: Waiting for specific LWP %s.\n", | |
2930 | target_pid_to_str (ptid)); | |
2931 | ||
2932 | /* We have a specific LWP to check. */ | |
2933 | lp = find_lwp_pid (ptid); | |
2934 | gdb_assert (lp); | |
2935 | status = lp->status; | |
2936 | lp->status = 0; | |
2937 | ||
2938 | if (debug_linux_nat && status) | |
2939 | fprintf_unfiltered (gdb_stdlog, | |
2940 | "LLW: Using pending wait status %s for %s.\n", | |
2941 | status_to_str (status), | |
2942 | target_pid_to_str (lp->ptid)); | |
2943 | ||
2944 | /* If we have to wait, take into account whether PID is a cloned | |
2945 | process or not. And we have to convert it to something that | |
2946 | the layer beneath us can understand. */ | |
2947 | options = lp->cloned ? __WCLONE : 0; | |
2948 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
2949 | |
2950 | /* We check for lp->waitstatus in addition to lp->status, | |
2951 | because we can have pending process exits recorded in | |
2952 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
2953 | an additional lp->status_p flag. */ | |
2954 | if (status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
2955 | lp = NULL; | |
d6b0e80f AC |
2956 | } |
2957 | ||
d90e17a7 | 2958 | if (lp && lp->signalled) |
d6b0e80f AC |
2959 | { |
2960 | /* A pending SIGSTOP may interfere with the normal stream of | |
2961 | events. In a typical case where interference is a problem, | |
2962 | we have a SIGSTOP signal pending for LWP A while | |
2963 | single-stepping it, encounter an event in LWP B, and take the | |
2964 | pending SIGSTOP while trying to stop LWP A. After processing | |
2965 | the event in LWP B, LWP A is continued, and we'll never see | |
2966 | the SIGTRAP associated with the last time we were | |
2967 | single-stepping LWP A. */ | |
2968 | ||
2969 | /* Resume the thread. It should halt immediately returning the | |
2970 | pending SIGSTOP. */ | |
2971 | registers_changed (); | |
28439f5e | 2972 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 2973 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
2974 | if (debug_linux_nat) |
2975 | fprintf_unfiltered (gdb_stdlog, | |
2976 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
2977 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2978 | target_pid_to_str (lp->ptid)); | |
2979 | lp->stopped = 0; | |
2980 | gdb_assert (lp->resumed); | |
2981 | ||
2982 | /* This should catch the pending SIGSTOP. */ | |
2983 | stop_wait_callback (lp, NULL); | |
2984 | } | |
2985 | ||
b84876c2 PA |
2986 | if (!target_can_async_p ()) |
2987 | { | |
2988 | /* Causes SIGINT to be passed on to the attached process. */ | |
2989 | set_sigint_trap (); | |
b84876c2 | 2990 | } |
d6b0e80f | 2991 | |
47608cb1 PA |
2992 | /* Translate generic target_wait options into waitpid options. */ |
2993 | if (target_options & TARGET_WNOHANG) | |
2994 | options |= WNOHANG; | |
7feb7d06 | 2995 | |
d90e17a7 | 2996 | while (lp == NULL) |
d6b0e80f AC |
2997 | { |
2998 | pid_t lwpid; | |
2999 | ||
7feb7d06 | 3000 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 3001 | |
d6b0e80f AC |
3002 | if (lwpid > 0) |
3003 | { | |
3004 | gdb_assert (pid == -1 || lwpid == pid); | |
3005 | ||
3006 | if (debug_linux_nat) | |
3007 | { | |
3008 | fprintf_unfiltered (gdb_stdlog, | |
3009 | "LLW: waitpid %ld received %s\n", | |
3010 | (long) lwpid, status_to_str (status)); | |
3011 | } | |
3012 | ||
02f3fc28 | 3013 | lp = linux_nat_filter_event (lwpid, status, options); |
d90e17a7 PA |
3014 | |
3015 | if (lp | |
3016 | && ptid_is_pid (ptid) | |
3017 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 3018 | { |
d90e17a7 PA |
3019 | if (debug_linux_nat) |
3020 | fprintf (stderr, "LWP %ld got an event %06x, leaving pending.\n", | |
3021 | ptid_get_lwp (lp->ptid), status); | |
3022 | ||
3023 | if (WIFSTOPPED (status)) | |
3024 | { | |
3025 | if (WSTOPSIG (status) != SIGSTOP) | |
3026 | { | |
3027 | lp->status = status; | |
3028 | ||
3029 | stop_callback (lp, NULL); | |
3030 | ||
3031 | /* Resume in order to collect the sigstop. */ | |
3032 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
3033 | ||
3034 | stop_wait_callback (lp, NULL); | |
3035 | } | |
3036 | else | |
3037 | { | |
3038 | lp->stopped = 1; | |
3039 | lp->signalled = 0; | |
3040 | } | |
3041 | } | |
3042 | else if (WIFEXITED (status) || WIFSIGNALED (status)) | |
3043 | { | |
3044 | if (debug_linux_nat) | |
3045 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
3046 | ptid_get_lwp (lp->ptid)); | |
3047 | ||
3048 | /* This was the last lwp in the process. Since | |
3049 | events are serialized to GDB core, and we can't | |
3050 | report this one right now, but GDB core and the | |
3051 | other target layers will want to be notified | |
3052 | about the exit code/signal, leave the status | |
3053 | pending for the next time we're able to report | |
3054 | it. */ | |
3055 | lp->status = status; | |
3056 | ||
3057 | /* Prevent trying to stop this thread again. We'll | |
3058 | never try to resume it because it has a pending | |
3059 | status. */ | |
3060 | lp->stopped = 1; | |
3061 | ||
3062 | /* Dead LWP's aren't expected to reported a pending | |
3063 | sigstop. */ | |
3064 | lp->signalled = 0; | |
3065 | ||
3066 | /* Store the pending event in the waitstatus as | |
3067 | well, because W_EXITCODE(0,0) == 0. */ | |
3068 | store_waitstatus (&lp->waitstatus, status); | |
3069 | } | |
3070 | ||
3071 | /* Keep looking. */ | |
3072 | lp = NULL; | |
d6b0e80f AC |
3073 | continue; |
3074 | } | |
3075 | ||
d90e17a7 PA |
3076 | if (lp) |
3077 | break; | |
3078 | else | |
3079 | { | |
3080 | if (pid == -1) | |
3081 | { | |
3082 | /* waitpid did return something. Restart over. */ | |
3083 | options |= __WCLONE; | |
3084 | } | |
3085 | continue; | |
3086 | } | |
d6b0e80f AC |
3087 | } |
3088 | ||
3089 | if (pid == -1) | |
3090 | { | |
3091 | /* Alternate between checking cloned and uncloned processes. */ | |
3092 | options ^= __WCLONE; | |
3093 | ||
b84876c2 PA |
3094 | /* And every time we have checked both: |
3095 | In async mode, return to event loop; | |
3096 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 3097 | if (options & __WCLONE) |
b84876c2 | 3098 | { |
47608cb1 | 3099 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
3100 | { |
3101 | /* No interesting event. */ | |
3102 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3103 | ||
b84876c2 PA |
3104 | if (debug_linux_nat_async) |
3105 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3106 | ||
7feb7d06 | 3107 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
3108 | return minus_one_ptid; |
3109 | } | |
3110 | ||
3111 | sigsuspend (&suspend_mask); | |
3112 | } | |
d6b0e80f AC |
3113 | } |
3114 | ||
3115 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3116 | gdb_assert (lp == NULL); |
d6b0e80f AC |
3117 | } |
3118 | ||
b84876c2 | 3119 | if (!target_can_async_p ()) |
d26b5354 | 3120 | clear_sigint_trap (); |
d6b0e80f AC |
3121 | |
3122 | gdb_assert (lp); | |
3123 | ||
3124 | /* Don't report signals that GDB isn't interested in, such as | |
3125 | signals that are neither printed nor stopped upon. Stopping all | |
3126 | threads can be a bit time-consuming so if we want decent | |
3127 | performance with heavily multi-threaded programs, especially when | |
3128 | they're using a high frequency timer, we'd better avoid it if we | |
3129 | can. */ | |
3130 | ||
3131 | if (WIFSTOPPED (status)) | |
3132 | { | |
3133 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
d6b48e9c PA |
3134 | struct inferior *inf; |
3135 | ||
3136 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
3137 | gdb_assert (inf); | |
d6b0e80f | 3138 | |
d6b48e9c PA |
3139 | /* Defer to common code if we get a signal while |
3140 | single-stepping, since that may need special care, e.g. to | |
3141 | skip the signal handler, or, if we're gaining control of the | |
3142 | inferior. */ | |
d539ed7e | 3143 | if (!lp->step |
d6b48e9c | 3144 | && inf->stop_soon == NO_STOP_QUIETLY |
d539ed7e | 3145 | && signal_stop_state (signo) == 0 |
d6b0e80f AC |
3146 | && signal_print_state (signo) == 0 |
3147 | && signal_pass_state (signo) == 1) | |
3148 | { | |
3149 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3150 | here? It is not clear we should. GDB may not expect | |
3151 | other threads to run. On the other hand, not resuming | |
3152 | newly attached threads may cause an unwanted delay in | |
3153 | getting them running. */ | |
3154 | registers_changed (); | |
28439f5e | 3155 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3156 | lp->step, signo); |
d6b0e80f AC |
3157 | if (debug_linux_nat) |
3158 | fprintf_unfiltered (gdb_stdlog, | |
3159 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3160 | lp->step ? | |
3161 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3162 | target_pid_to_str (lp->ptid), | |
3163 | signo ? strsignal (signo) : "0"); | |
3164 | lp->stopped = 0; | |
d6b0e80f AC |
3165 | goto retry; |
3166 | } | |
3167 | ||
1ad15515 | 3168 | if (!non_stop) |
d6b0e80f | 3169 | { |
1ad15515 PA |
3170 | /* Only do the below in all-stop, as we currently use SIGINT |
3171 | to implement target_stop (see linux_nat_stop) in | |
3172 | non-stop. */ | |
3173 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3174 | { | |
3175 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3176 | forwarded to the entire process group, that is, all LWPs | |
3177 | will receive it - unless they're using CLONE_THREAD to | |
3178 | share signals. Since we only want to report it once, we | |
3179 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3180 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3181 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3182 | lp->ignore_sigint = 0; |
3183 | } | |
3184 | else | |
3185 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3186 | } |
3187 | } | |
3188 | ||
3189 | /* This LWP is stopped now. */ | |
3190 | lp->stopped = 1; | |
3191 | ||
3192 | if (debug_linux_nat) | |
3193 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3194 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3195 | ||
4c28f408 PA |
3196 | if (!non_stop) |
3197 | { | |
3198 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3199 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3200 | |
3201 | /* ... and wait until all of them have reported back that | |
3202 | they're no longer running. */ | |
d90e17a7 | 3203 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3204 | |
3205 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3206 | from among those that have had events. Giving equal priority | |
3207 | to all LWPs that have had events helps prevent | |
3208 | starvation. */ | |
3209 | if (pid == -1) | |
d90e17a7 | 3210 | select_event_lwp (ptid, &lp, &status); |
4c28f408 | 3211 | } |
d6b0e80f AC |
3212 | |
3213 | /* Now that we've selected our final event LWP, cancel any | |
3214 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
3215 | the comment in cancel_breakpoints_callback to find out why. */ | |
d90e17a7 | 3216 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); |
d6b0e80f | 3217 | |
d6b0e80f AC |
3218 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) |
3219 | { | |
d6b0e80f AC |
3220 | if (debug_linux_nat) |
3221 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3222 | "LLW: trap ptid is %s.\n", |
3223 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3224 | } |
d6b0e80f AC |
3225 | |
3226 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3227 | { | |
3228 | *ourstatus = lp->waitstatus; | |
3229 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3230 | } | |
3231 | else | |
3232 | store_waitstatus (ourstatus, status); | |
3233 | ||
b84876c2 PA |
3234 | if (debug_linux_nat_async) |
3235 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); | |
3236 | ||
7feb7d06 | 3237 | restore_child_signals_mask (&prev_mask); |
f973ed9c | 3238 | return lp->ptid; |
d6b0e80f AC |
3239 | } |
3240 | ||
7feb7d06 PA |
3241 | static ptid_t |
3242 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3243 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3244 | int target_options) | |
7feb7d06 PA |
3245 | { |
3246 | ptid_t event_ptid; | |
3247 | ||
3248 | if (debug_linux_nat) | |
3249 | fprintf_unfiltered (gdb_stdlog, "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
3250 | ||
3251 | /* Flush the async file first. */ | |
3252 | if (target_can_async_p ()) | |
3253 | async_file_flush (); | |
3254 | ||
47608cb1 | 3255 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3256 | |
3257 | /* If we requested any event, and something came out, assume there | |
3258 | may be more. If we requested a specific lwp or process, also | |
3259 | assume there may be more. */ | |
3260 | if (target_can_async_p () | |
3261 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3262 | || !ptid_equal (ptid, minus_one_ptid))) | |
3263 | async_file_mark (); | |
3264 | ||
3265 | /* Get ready for the next event. */ | |
3266 | if (target_can_async_p ()) | |
3267 | target_async (inferior_event_handler, 0); | |
3268 | ||
3269 | return event_ptid; | |
3270 | } | |
3271 | ||
d6b0e80f AC |
3272 | static int |
3273 | kill_callback (struct lwp_info *lp, void *data) | |
3274 | { | |
3275 | errno = 0; | |
3276 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3277 | if (debug_linux_nat) | |
3278 | fprintf_unfiltered (gdb_stdlog, | |
3279 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3280 | target_pid_to_str (lp->ptid), | |
3281 | errno ? safe_strerror (errno) : "OK"); | |
3282 | ||
3283 | return 0; | |
3284 | } | |
3285 | ||
3286 | static int | |
3287 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3288 | { | |
3289 | pid_t pid; | |
3290 | ||
3291 | /* We must make sure that there are no pending events (delayed | |
3292 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3293 | program doesn't interfere with any following debugging session. */ | |
3294 | ||
3295 | /* For cloned processes we must check both with __WCLONE and | |
3296 | without, since the exit status of a cloned process isn't reported | |
3297 | with __WCLONE. */ | |
3298 | if (lp->cloned) | |
3299 | { | |
3300 | do | |
3301 | { | |
58aecb61 | 3302 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3303 | if (pid != (pid_t) -1) |
d6b0e80f | 3304 | { |
e85a822c DJ |
3305 | if (debug_linux_nat) |
3306 | fprintf_unfiltered (gdb_stdlog, | |
3307 | "KWC: wait %s received unknown.\n", | |
3308 | target_pid_to_str (lp->ptid)); | |
3309 | /* The Linux kernel sometimes fails to kill a thread | |
3310 | completely after PTRACE_KILL; that goes from the stop | |
3311 | point in do_fork out to the one in | |
3312 | get_signal_to_deliever and waits again. So kill it | |
3313 | again. */ | |
3314 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3315 | } |
3316 | } | |
3317 | while (pid == GET_LWP (lp->ptid)); | |
3318 | ||
3319 | gdb_assert (pid == -1 && errno == ECHILD); | |
3320 | } | |
3321 | ||
3322 | do | |
3323 | { | |
58aecb61 | 3324 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3325 | if (pid != (pid_t) -1) |
d6b0e80f | 3326 | { |
e85a822c DJ |
3327 | if (debug_linux_nat) |
3328 | fprintf_unfiltered (gdb_stdlog, | |
3329 | "KWC: wait %s received unk.\n", | |
3330 | target_pid_to_str (lp->ptid)); | |
3331 | /* See the call to kill_callback above. */ | |
3332 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3333 | } |
3334 | } | |
3335 | while (pid == GET_LWP (lp->ptid)); | |
3336 | ||
3337 | gdb_assert (pid == -1 && errno == ECHILD); | |
3338 | return 0; | |
3339 | } | |
3340 | ||
3341 | static void | |
7d85a9c0 | 3342 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3343 | { |
f973ed9c DJ |
3344 | struct target_waitstatus last; |
3345 | ptid_t last_ptid; | |
3346 | int status; | |
d6b0e80f | 3347 | |
f973ed9c DJ |
3348 | /* If we're stopped while forking and we haven't followed yet, |
3349 | kill the other task. We need to do this first because the | |
3350 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3351 | |
f973ed9c | 3352 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3353 | |
f973ed9c DJ |
3354 | if (last.kind == TARGET_WAITKIND_FORKED |
3355 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3356 | { | |
3a3e9ee3 | 3357 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3358 | wait (&status); |
3359 | } | |
3360 | ||
3361 | if (forks_exist_p ()) | |
7feb7d06 | 3362 | linux_fork_killall (); |
f973ed9c DJ |
3363 | else |
3364 | { | |
d90e17a7 | 3365 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
4c28f408 PA |
3366 | /* Stop all threads before killing them, since ptrace requires |
3367 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3368 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3369 | /* ... and wait until all of them have reported back that |
3370 | they're no longer running. */ | |
d90e17a7 | 3371 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3372 | |
f973ed9c | 3373 | /* Kill all LWP's ... */ |
d90e17a7 | 3374 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3375 | |
3376 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3377 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3378 | } |
3379 | ||
3380 | target_mourn_inferior (); | |
d6b0e80f AC |
3381 | } |
3382 | ||
3383 | static void | |
136d6dae | 3384 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3385 | { |
d90e17a7 | 3386 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 3387 | |
f973ed9c | 3388 | if (! forks_exist_p ()) |
d90e17a7 PA |
3389 | /* Normal case, no other forks available. */ |
3390 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3391 | else |
3392 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3393 | there are other viable forks to debug. Delete the exiting | |
3394 | one and context-switch to the first available. */ | |
3395 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3396 | } |
3397 | ||
5b009018 PA |
3398 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3399 | layout of the inferiors' architecture. */ | |
3400 | ||
3401 | static void | |
3402 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
3403 | { | |
3404 | int done = 0; | |
3405 | ||
3406 | if (linux_nat_siginfo_fixup != NULL) | |
3407 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3408 | ||
3409 | /* If there was no callback, or the callback didn't do anything, | |
3410 | then just do a straight memcpy. */ | |
3411 | if (!done) | |
3412 | { | |
3413 | if (direction == 1) | |
3414 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3415 | else | |
3416 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3417 | } | |
3418 | } | |
3419 | ||
4aa995e1 PA |
3420 | static LONGEST |
3421 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
3422 | const char *annex, gdb_byte *readbuf, | |
3423 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3424 | { | |
4aa995e1 PA |
3425 | int pid; |
3426 | struct siginfo siginfo; | |
5b009018 | 3427 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3428 | |
3429 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3430 | gdb_assert (readbuf || writebuf); | |
3431 | ||
3432 | pid = GET_LWP (inferior_ptid); | |
3433 | if (pid == 0) | |
3434 | pid = GET_PID (inferior_ptid); | |
3435 | ||
3436 | if (offset > sizeof (siginfo)) | |
3437 | return -1; | |
3438 | ||
3439 | errno = 0; | |
3440 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3441 | if (errno != 0) | |
3442 | return -1; | |
3443 | ||
5b009018 PA |
3444 | /* When GDB is built as a 64-bit application, ptrace writes into |
3445 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3446 | inferior with a 64-bit GDB should look the same as debugging it | |
3447 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3448 | the converted layout, so any read/write will have to be done | |
3449 | post-conversion. */ | |
3450 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3451 | ||
4aa995e1 PA |
3452 | if (offset + len > sizeof (siginfo)) |
3453 | len = sizeof (siginfo) - offset; | |
3454 | ||
3455 | if (readbuf != NULL) | |
5b009018 | 3456 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3457 | else |
3458 | { | |
5b009018 PA |
3459 | memcpy (inf_siginfo + offset, writebuf, len); |
3460 | ||
3461 | /* Convert back to ptrace layout before flushing it out. */ | |
3462 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3463 | ||
4aa995e1 PA |
3464 | errno = 0; |
3465 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3466 | if (errno != 0) | |
3467 | return -1; | |
3468 | } | |
3469 | ||
3470 | return len; | |
3471 | } | |
3472 | ||
10d6c8cd DJ |
3473 | static LONGEST |
3474 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
3475 | const char *annex, gdb_byte *readbuf, | |
3476 | const gdb_byte *writebuf, | |
3477 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 3478 | { |
4aa995e1 | 3479 | struct cleanup *old_chain; |
10d6c8cd | 3480 | LONGEST xfer; |
d6b0e80f | 3481 | |
4aa995e1 PA |
3482 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3483 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
3484 | offset, len); | |
3485 | ||
c35b1492 PA |
3486 | /* The target is connected but no live inferior is selected. Pass |
3487 | this request down to a lower stratum (e.g., the executable | |
3488 | file). */ | |
3489 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
3490 | return 0; | |
3491 | ||
4aa995e1 PA |
3492 | old_chain = save_inferior_ptid (); |
3493 | ||
d6b0e80f AC |
3494 | if (is_lwp (inferior_ptid)) |
3495 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
3496 | ||
10d6c8cd DJ |
3497 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
3498 | offset, len); | |
d6b0e80f AC |
3499 | |
3500 | do_cleanups (old_chain); | |
3501 | return xfer; | |
3502 | } | |
3503 | ||
3504 | static int | |
28439f5e | 3505 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 3506 | { |
4c28f408 PA |
3507 | int err; |
3508 | ||
d6b0e80f AC |
3509 | gdb_assert (is_lwp (ptid)); |
3510 | ||
4c28f408 PA |
3511 | /* Send signal 0 instead of anything ptrace, because ptracing a |
3512 | running thread errors out claiming that the thread doesn't | |
3513 | exist. */ | |
3514 | err = kill_lwp (GET_LWP (ptid), 0); | |
3515 | ||
d6b0e80f AC |
3516 | if (debug_linux_nat) |
3517 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 3518 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 3519 | target_pid_to_str (ptid), |
4c28f408 | 3520 | err ? safe_strerror (err) : "OK"); |
9c0dd46b | 3521 | |
4c28f408 | 3522 | if (err != 0) |
d6b0e80f AC |
3523 | return 0; |
3524 | ||
3525 | return 1; | |
3526 | } | |
3527 | ||
28439f5e PA |
3528 | static int |
3529 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
3530 | { | |
3531 | return linux_thread_alive (ptid); | |
3532 | } | |
3533 | ||
d6b0e80f | 3534 | static char * |
117de6a9 | 3535 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
3536 | { |
3537 | static char buf[64]; | |
3538 | ||
a0ef4274 | 3539 | if (is_lwp (ptid) |
d90e17a7 PA |
3540 | && (GET_PID (ptid) != GET_LWP (ptid) |
3541 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
3542 | { |
3543 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
3544 | return buf; | |
3545 | } | |
3546 | ||
3547 | return normal_pid_to_str (ptid); | |
3548 | } | |
3549 | ||
dba24537 AC |
3550 | /* Accepts an integer PID; Returns a string representing a file that |
3551 | can be opened to get the symbols for the child process. */ | |
3552 | ||
6d8fd2b7 UW |
3553 | static char * |
3554 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
3555 | { |
3556 | char *name1, *name2; | |
3557 | ||
3558 | name1 = xmalloc (MAXPATHLEN); | |
3559 | name2 = xmalloc (MAXPATHLEN); | |
3560 | make_cleanup (xfree, name1); | |
3561 | make_cleanup (xfree, name2); | |
3562 | memset (name2, 0, MAXPATHLEN); | |
3563 | ||
3564 | sprintf (name1, "/proc/%d/exe", pid); | |
3565 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
3566 | return name2; | |
3567 | else | |
3568 | return name1; | |
3569 | } | |
3570 | ||
3571 | /* Service function for corefiles and info proc. */ | |
3572 | ||
3573 | static int | |
3574 | read_mapping (FILE *mapfile, | |
3575 | long long *addr, | |
3576 | long long *endaddr, | |
3577 | char *permissions, | |
3578 | long long *offset, | |
3579 | char *device, long long *inode, char *filename) | |
3580 | { | |
3581 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
3582 | addr, endaddr, permissions, offset, device, inode); | |
3583 | ||
2e14c2ea MS |
3584 | filename[0] = '\0'; |
3585 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
3586 | { |
3587 | /* Eat everything up to EOL for the filename. This will prevent | |
3588 | weird filenames (such as one with embedded whitespace) from | |
3589 | confusing this code. It also makes this code more robust in | |
3590 | respect to annotations the kernel may add after the filename. | |
3591 | ||
3592 | Note the filename is used for informational purposes | |
3593 | only. */ | |
3594 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
3595 | } | |
2e14c2ea | 3596 | |
dba24537 AC |
3597 | return (ret != 0 && ret != EOF); |
3598 | } | |
3599 | ||
3600 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
3601 | regions in the inferior for a corefile. */ | |
3602 | ||
3603 | static int | |
3604 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
3605 | unsigned long, | |
3606 | int, int, int, void *), void *obfd) | |
3607 | { | |
89ecc4f5 | 3608 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
3609 | char mapsfilename[MAXPATHLEN]; |
3610 | FILE *mapsfile; | |
3611 | long long addr, endaddr, size, offset, inode; | |
3612 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
3613 | int read, write, exec; | |
3614 | int ret; | |
7c8a8b04 | 3615 | struct cleanup *cleanup; |
dba24537 AC |
3616 | |
3617 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 3618 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 3619 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 3620 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 3621 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
3622 | |
3623 | if (info_verbose) | |
3624 | fprintf_filtered (gdb_stdout, | |
3625 | "Reading memory regions from %s\n", mapsfilename); | |
3626 | ||
3627 | /* Now iterate until end-of-file. */ | |
3628 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
3629 | &offset, &device[0], &inode, &filename[0])) | |
3630 | { | |
3631 | size = endaddr - addr; | |
3632 | ||
3633 | /* Get the segment's permissions. */ | |
3634 | read = (strchr (permissions, 'r') != 0); | |
3635 | write = (strchr (permissions, 'w') != 0); | |
3636 | exec = (strchr (permissions, 'x') != 0); | |
3637 | ||
3638 | if (info_verbose) | |
3639 | { | |
3640 | fprintf_filtered (gdb_stdout, | |
5af949e3 UW |
3641 | "Save segment, %lld bytes at %s (%c%c%c)", |
3642 | size, paddress (target_gdbarch, addr), | |
dba24537 AC |
3643 | read ? 'r' : ' ', |
3644 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 3645 | if (filename[0]) |
dba24537 AC |
3646 | fprintf_filtered (gdb_stdout, " for %s", filename); |
3647 | fprintf_filtered (gdb_stdout, "\n"); | |
3648 | } | |
3649 | ||
3650 | /* Invoke the callback function to create the corefile | |
3651 | segment. */ | |
3652 | func (addr, size, read, write, exec, obfd); | |
3653 | } | |
7c8a8b04 | 3654 | do_cleanups (cleanup); |
dba24537 AC |
3655 | return 0; |
3656 | } | |
3657 | ||
2020b7ab PA |
3658 | static int |
3659 | find_signalled_thread (struct thread_info *info, void *data) | |
3660 | { | |
3661 | if (info->stop_signal != TARGET_SIGNAL_0 | |
3662 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) | |
3663 | return 1; | |
3664 | ||
3665 | return 0; | |
3666 | } | |
3667 | ||
3668 | static enum target_signal | |
3669 | find_stop_signal (void) | |
3670 | { | |
3671 | struct thread_info *info = | |
3672 | iterate_over_threads (find_signalled_thread, NULL); | |
3673 | ||
3674 | if (info) | |
3675 | return info->stop_signal; | |
3676 | else | |
3677 | return TARGET_SIGNAL_0; | |
3678 | } | |
3679 | ||
dba24537 AC |
3680 | /* Records the thread's register state for the corefile note |
3681 | section. */ | |
3682 | ||
3683 | static char * | |
3684 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
3685 | char *note_data, int *note_size, |
3686 | enum target_signal stop_signal) | |
dba24537 AC |
3687 | { |
3688 | gdb_gregset_t gregs; | |
3689 | gdb_fpregset_t fpregs; | |
dba24537 | 3690 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
3691 | struct gdbarch *gdbarch = target_gdbarch; |
3692 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 3693 | const struct regset *regset; |
55e969c1 | 3694 | int core_regset_p; |
594f7785 | 3695 | struct cleanup *old_chain; |
17ea7499 CES |
3696 | struct core_regset_section *sect_list; |
3697 | char *gdb_regset; | |
594f7785 UW |
3698 | |
3699 | old_chain = save_inferior_ptid (); | |
3700 | inferior_ptid = ptid; | |
3701 | target_fetch_registers (regcache, -1); | |
3702 | do_cleanups (old_chain); | |
4f844a66 DM |
3703 | |
3704 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
3705 | sect_list = gdbarch_core_regset_sections (gdbarch); |
3706 | ||
55e969c1 DM |
3707 | if (core_regset_p |
3708 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3709 | sizeof (gregs))) != NULL | |
3710 | && regset->collect_regset != NULL) | |
594f7785 | 3711 | regset->collect_regset (regset, regcache, -1, |
55e969c1 | 3712 | &gregs, sizeof (gregs)); |
4f844a66 | 3713 | else |
594f7785 | 3714 | fill_gregset (regcache, &gregs, -1); |
4f844a66 | 3715 | |
55e969c1 DM |
3716 | note_data = (char *) elfcore_write_prstatus (obfd, |
3717 | note_data, | |
3718 | note_size, | |
3719 | lwp, | |
3720 | stop_signal, &gregs); | |
3721 | ||
17ea7499 CES |
3722 | /* The loop below uses the new struct core_regset_section, which stores |
3723 | the supported section names and sizes for the core file. Note that | |
3724 | note PRSTATUS needs to be treated specially. But the other notes are | |
3725 | structurally the same, so they can benefit from the new struct. */ | |
3726 | if (core_regset_p && sect_list != NULL) | |
3727 | while (sect_list->sect_name != NULL) | |
3728 | { | |
3729 | /* .reg was already handled above. */ | |
3730 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
3731 | { | |
3732 | sect_list++; | |
3733 | continue; | |
3734 | } | |
3735 | regset = gdbarch_regset_from_core_section (gdbarch, | |
3736 | sect_list->sect_name, | |
3737 | sect_list->size); | |
3738 | gdb_assert (regset && regset->collect_regset); | |
3739 | gdb_regset = xmalloc (sect_list->size); | |
3740 | regset->collect_regset (regset, regcache, -1, | |
3741 | gdb_regset, sect_list->size); | |
3742 | note_data = (char *) elfcore_write_register_note (obfd, | |
3743 | note_data, | |
3744 | note_size, | |
3745 | sect_list->sect_name, | |
3746 | gdb_regset, | |
3747 | sect_list->size); | |
3748 | xfree (gdb_regset); | |
3749 | sect_list++; | |
3750 | } | |
dba24537 | 3751 | |
17ea7499 CES |
3752 | /* For architectures that does not have the struct core_regset_section |
3753 | implemented, we use the old method. When all the architectures have | |
3754 | the new support, the code below should be deleted. */ | |
4f844a66 | 3755 | else |
17ea7499 CES |
3756 | { |
3757 | if (core_regset_p | |
3758 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3759 | sizeof (fpregs))) != NULL | |
3760 | && regset->collect_regset != NULL) | |
3761 | regset->collect_regset (regset, regcache, -1, | |
3762 | &fpregs, sizeof (fpregs)); | |
3763 | else | |
3764 | fill_fpregset (regcache, &fpregs, -1); | |
3765 | ||
3766 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
3767 | note_data, | |
3768 | note_size, | |
3769 | &fpregs, sizeof (fpregs)); | |
3770 | } | |
4f844a66 | 3771 | |
dba24537 AC |
3772 | return note_data; |
3773 | } | |
3774 | ||
3775 | struct linux_nat_corefile_thread_data | |
3776 | { | |
3777 | bfd *obfd; | |
3778 | char *note_data; | |
3779 | int *note_size; | |
3780 | int num_notes; | |
2020b7ab | 3781 | enum target_signal stop_signal; |
dba24537 AC |
3782 | }; |
3783 | ||
3784 | /* Called by gdbthread.c once per thread. Records the thread's | |
3785 | register state for the corefile note section. */ | |
3786 | ||
3787 | static int | |
3788 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
3789 | { | |
3790 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 3791 | |
dba24537 AC |
3792 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
3793 | ti->ptid, | |
3794 | args->note_data, | |
2020b7ab PA |
3795 | args->note_size, |
3796 | args->stop_signal); | |
dba24537 | 3797 | args->num_notes++; |
56be3814 | 3798 | |
dba24537 AC |
3799 | return 0; |
3800 | } | |
3801 | ||
efcbbd14 UW |
3802 | /* Enumerate spufs IDs for process PID. */ |
3803 | ||
3804 | static void | |
3805 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
3806 | { | |
3807 | char path[128]; | |
3808 | DIR *dir; | |
3809 | struct dirent *entry; | |
3810 | ||
3811 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
3812 | dir = opendir (path); | |
3813 | if (!dir) | |
3814 | return; | |
3815 | ||
3816 | rewinddir (dir); | |
3817 | while ((entry = readdir (dir)) != NULL) | |
3818 | { | |
3819 | struct stat st; | |
3820 | struct statfs stfs; | |
3821 | int fd; | |
3822 | ||
3823 | fd = atoi (entry->d_name); | |
3824 | if (!fd) | |
3825 | continue; | |
3826 | ||
3827 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
3828 | if (stat (path, &st) != 0) | |
3829 | continue; | |
3830 | if (!S_ISDIR (st.st_mode)) | |
3831 | continue; | |
3832 | ||
3833 | if (statfs (path, &stfs) != 0) | |
3834 | continue; | |
3835 | if (stfs.f_type != SPUFS_MAGIC) | |
3836 | continue; | |
3837 | ||
3838 | callback (data, fd); | |
3839 | } | |
3840 | ||
3841 | closedir (dir); | |
3842 | } | |
3843 | ||
3844 | /* Generate corefile notes for SPU contexts. */ | |
3845 | ||
3846 | struct linux_spu_corefile_data | |
3847 | { | |
3848 | bfd *obfd; | |
3849 | char *note_data; | |
3850 | int *note_size; | |
3851 | }; | |
3852 | ||
3853 | static void | |
3854 | linux_spu_corefile_callback (void *data, int fd) | |
3855 | { | |
3856 | struct linux_spu_corefile_data *args = data; | |
3857 | int i; | |
3858 | ||
3859 | static const char *spu_files[] = | |
3860 | { | |
3861 | "object-id", | |
3862 | "mem", | |
3863 | "regs", | |
3864 | "fpcr", | |
3865 | "lslr", | |
3866 | "decr", | |
3867 | "decr_status", | |
3868 | "signal1", | |
3869 | "signal1_type", | |
3870 | "signal2", | |
3871 | "signal2_type", | |
3872 | "event_mask", | |
3873 | "event_status", | |
3874 | "mbox_info", | |
3875 | "ibox_info", | |
3876 | "wbox_info", | |
3877 | "dma_info", | |
3878 | "proxydma_info", | |
3879 | }; | |
3880 | ||
3881 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
3882 | { | |
3883 | char annex[32], note_name[32]; | |
3884 | gdb_byte *spu_data; | |
3885 | LONGEST spu_len; | |
3886 | ||
3887 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
3888 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
3889 | annex, &spu_data); | |
3890 | if (spu_len > 0) | |
3891 | { | |
3892 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
3893 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
3894 | args->note_size, note_name, | |
3895 | NT_SPU, spu_data, spu_len); | |
3896 | xfree (spu_data); | |
3897 | } | |
3898 | } | |
3899 | } | |
3900 | ||
3901 | static char * | |
3902 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
3903 | { | |
3904 | struct linux_spu_corefile_data args; | |
3905 | args.obfd = obfd; | |
3906 | args.note_data = note_data; | |
3907 | args.note_size = note_size; | |
3908 | ||
3909 | iterate_over_spus (PIDGET (inferior_ptid), | |
3910 | linux_spu_corefile_callback, &args); | |
3911 | ||
3912 | return args.note_data; | |
3913 | } | |
3914 | ||
dba24537 AC |
3915 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
3916 | section for a corefile, and returns it in a malloc buffer. */ | |
3917 | ||
3918 | static char * | |
3919 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
3920 | { | |
3921 | struct linux_nat_corefile_thread_data thread_args; | |
3922 | struct cleanup *old_chain; | |
d99148ef | 3923 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 3924 | char fname[16] = { '\0' }; |
d99148ef | 3925 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
3926 | char psargs[80] = { '\0' }; |
3927 | char *note_data = NULL; | |
3928 | ptid_t current_ptid = inferior_ptid; | |
d90e17a7 | 3929 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 3930 | gdb_byte *auxv; |
dba24537 AC |
3931 | int auxv_len; |
3932 | ||
3933 | if (get_exec_file (0)) | |
3934 | { | |
3935 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
3936 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
3937 | if (get_inferior_args ()) | |
3938 | { | |
d99148ef JK |
3939 | char *string_end; |
3940 | char *psargs_end = psargs + sizeof (psargs); | |
3941 | ||
3942 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
3943 | strings fine. */ | |
3944 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
3945 | if (string_end != NULL) | |
3946 | { | |
3947 | *string_end++ = ' '; | |
3948 | strncpy (string_end, get_inferior_args (), | |
3949 | psargs_end - string_end); | |
3950 | } | |
dba24537 AC |
3951 | } |
3952 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
3953 | note_data, | |
3954 | note_size, fname, psargs); | |
3955 | } | |
3956 | ||
3957 | /* Dump information for threads. */ | |
3958 | thread_args.obfd = obfd; | |
3959 | thread_args.note_data = note_data; | |
3960 | thread_args.note_size = note_size; | |
3961 | thread_args.num_notes = 0; | |
2020b7ab | 3962 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 3963 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
3964 | gdb_assert (thread_args.num_notes != 0); |
3965 | note_data = thread_args.note_data; | |
dba24537 | 3966 | |
13547ab6 DJ |
3967 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
3968 | NULL, &auxv); | |
dba24537 AC |
3969 | if (auxv_len > 0) |
3970 | { | |
3971 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
3972 | "CORE", NT_AUXV, auxv, auxv_len); | |
3973 | xfree (auxv); | |
3974 | } | |
3975 | ||
efcbbd14 UW |
3976 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
3977 | ||
dba24537 AC |
3978 | make_cleanup (xfree, note_data); |
3979 | return note_data; | |
3980 | } | |
3981 | ||
3982 | /* Implement the "info proc" command. */ | |
3983 | ||
3984 | static void | |
3985 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
3986 | { | |
89ecc4f5 DE |
3987 | /* A long is used for pid instead of an int to avoid a loss of precision |
3988 | compiler warning from the output of strtoul. */ | |
3989 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
3990 | FILE *procfile; |
3991 | char **argv = NULL; | |
3992 | char buffer[MAXPATHLEN]; | |
3993 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
3994 | int cmdline_f = 1; | |
3995 | int cwd_f = 1; | |
3996 | int exe_f = 1; | |
3997 | int mappings_f = 0; | |
3998 | int environ_f = 0; | |
3999 | int status_f = 0; | |
4000 | int stat_f = 0; | |
4001 | int all = 0; | |
4002 | struct stat dummy; | |
4003 | ||
4004 | if (args) | |
4005 | { | |
4006 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
4007 | argv = gdb_buildargv (args); |
4008 | make_cleanup_freeargv (argv); | |
dba24537 AC |
4009 | } |
4010 | while (argv != NULL && *argv != NULL) | |
4011 | { | |
4012 | if (isdigit (argv[0][0])) | |
4013 | { | |
4014 | pid = strtoul (argv[0], NULL, 10); | |
4015 | } | |
4016 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
4017 | { | |
4018 | mappings_f = 1; | |
4019 | } | |
4020 | else if (strcmp (argv[0], "status") == 0) | |
4021 | { | |
4022 | status_f = 1; | |
4023 | } | |
4024 | else if (strcmp (argv[0], "stat") == 0) | |
4025 | { | |
4026 | stat_f = 1; | |
4027 | } | |
4028 | else if (strcmp (argv[0], "cmd") == 0) | |
4029 | { | |
4030 | cmdline_f = 1; | |
4031 | } | |
4032 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
4033 | { | |
4034 | exe_f = 1; | |
4035 | } | |
4036 | else if (strcmp (argv[0], "cwd") == 0) | |
4037 | { | |
4038 | cwd_f = 1; | |
4039 | } | |
4040 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
4041 | { | |
4042 | all = 1; | |
4043 | } | |
4044 | else | |
4045 | { | |
4046 | /* [...] (future options here) */ | |
4047 | } | |
4048 | argv++; | |
4049 | } | |
4050 | if (pid == 0) | |
8a3fe4f8 | 4051 | error (_("No current process: you must name one.")); |
dba24537 | 4052 | |
89ecc4f5 | 4053 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4054 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4055 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4056 | |
89ecc4f5 | 4057 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
4058 | if (cmdline_f || all) |
4059 | { | |
89ecc4f5 | 4060 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4061 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4062 | { |
7c8a8b04 | 4063 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
bf1d7d9c JB |
4064 | if (fgets (buffer, sizeof (buffer), procfile)) |
4065 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4066 | else | |
4067 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4068 | do_cleanups (cleanup); |
dba24537 AC |
4069 | } |
4070 | else | |
8a3fe4f8 | 4071 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4072 | } |
4073 | if (cwd_f || all) | |
4074 | { | |
89ecc4f5 | 4075 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4076 | memset (fname2, 0, sizeof (fname2)); |
4077 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4078 | printf_filtered ("cwd = '%s'\n", fname2); | |
4079 | else | |
8a3fe4f8 | 4080 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4081 | } |
4082 | if (exe_f || all) | |
4083 | { | |
89ecc4f5 | 4084 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4085 | memset (fname2, 0, sizeof (fname2)); |
4086 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4087 | printf_filtered ("exe = '%s'\n", fname2); | |
4088 | else | |
8a3fe4f8 | 4089 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4090 | } |
4091 | if (mappings_f || all) | |
4092 | { | |
89ecc4f5 | 4093 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4094 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4095 | { |
4096 | long long addr, endaddr, size, offset, inode; | |
4097 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4098 | struct cleanup *cleanup; |
dba24537 | 4099 | |
7c8a8b04 | 4100 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4101 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4102 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4103 | { |
4104 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4105 | "Start Addr", | |
4106 | " End Addr", | |
4107 | " Size", " Offset", "objfile"); | |
4108 | } | |
4109 | else | |
4110 | { | |
4111 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4112 | "Start Addr", | |
4113 | " End Addr", | |
4114 | " Size", " Offset", "objfile"); | |
4115 | } | |
4116 | ||
4117 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4118 | &offset, &device[0], &inode, &filename[0])) | |
4119 | { | |
4120 | size = endaddr - addr; | |
4121 | ||
4122 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4123 | calls here (and possibly above) should be abstracted | |
4124 | out into their own functions? Andrew suggests using | |
4125 | a generic local_address_string instead to print out | |
4126 | the addresses; that makes sense to me, too. */ | |
4127 | ||
a97b0ac8 | 4128 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4129 | { |
4130 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4131 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4132 | (unsigned long) endaddr, | |
4133 | (int) size, | |
4134 | (unsigned int) offset, | |
4135 | filename[0] ? filename : ""); | |
4136 | } | |
4137 | else | |
4138 | { | |
4139 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4140 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4141 | (unsigned long) endaddr, | |
4142 | (int) size, | |
4143 | (unsigned int) offset, | |
4144 | filename[0] ? filename : ""); | |
4145 | } | |
4146 | } | |
4147 | ||
7c8a8b04 | 4148 | do_cleanups (cleanup); |
dba24537 AC |
4149 | } |
4150 | else | |
8a3fe4f8 | 4151 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4152 | } |
4153 | if (status_f || all) | |
4154 | { | |
89ecc4f5 | 4155 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4156 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4157 | { |
7c8a8b04 | 4158 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4159 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4160 | puts_filtered (buffer); | |
7c8a8b04 | 4161 | do_cleanups (cleanup); |
dba24537 AC |
4162 | } |
4163 | else | |
8a3fe4f8 | 4164 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4165 | } |
4166 | if (stat_f || all) | |
4167 | { | |
89ecc4f5 | 4168 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4169 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4170 | { |
4171 | int itmp; | |
4172 | char ctmp; | |
a25694b4 | 4173 | long ltmp; |
7c8a8b04 | 4174 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4175 | |
4176 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4177 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4178 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4179 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4180 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4181 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4182 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4183 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4184 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4185 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4186 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4187 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4188 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4189 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4190 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4191 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4192 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4193 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4194 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4195 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4196 | (unsigned long) ltmp); | |
4197 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4198 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4199 | (unsigned long) ltmp); | |
4200 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4201 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4202 | (unsigned long) ltmp); | |
4203 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4204 | printf_filtered (_("Major faults, children: %lu\n"), | |
4205 | (unsigned long) ltmp); | |
4206 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4207 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4208 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4209 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4210 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4211 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4212 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4213 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4214 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4215 | printf_filtered (_("jiffies remaining in current time slice: %ld\n"), | |
4216 | ltmp); | |
4217 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4218 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4219 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4220 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4221 | (unsigned long) ltmp); | |
4222 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4223 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4224 | (unsigned long) ltmp); | |
4225 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4226 | printf_filtered (_("start time (jiffies since system boot): %ld\n"), | |
4227 | ltmp); | |
4228 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4229 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4230 | (unsigned long) ltmp); | |
4231 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4232 | printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp); | |
4233 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4234 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4235 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4236 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4237 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4238 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4239 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4240 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
dba24537 AC |
4241 | #if 0 /* Don't know how architecture-dependent the rest is... |
4242 | Anyway the signal bitmap info is available from "status". */ | |
a25694b4 AS |
4243 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
4244 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); | |
4245 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
4246 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); | |
4247 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4248 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
4249 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4250 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
4251 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4252 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
4253 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4254 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
4255 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
4256 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); | |
dba24537 | 4257 | #endif |
7c8a8b04 | 4258 | do_cleanups (cleanup); |
dba24537 AC |
4259 | } |
4260 | else | |
8a3fe4f8 | 4261 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4262 | } |
4263 | } | |
4264 | ||
10d6c8cd DJ |
4265 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
4266 | filesystem. Because we can use a single read() call for /proc, this | |
4267 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
4268 | but it doesn't support writes. */ | |
4269 | ||
4270 | static LONGEST | |
4271 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
4272 | const char *annex, gdb_byte *readbuf, | |
4273 | const gdb_byte *writebuf, | |
4274 | ULONGEST offset, LONGEST len) | |
dba24537 | 4275 | { |
10d6c8cd DJ |
4276 | LONGEST ret; |
4277 | int fd; | |
dba24537 AC |
4278 | char filename[64]; |
4279 | ||
10d6c8cd | 4280 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
4281 | return 0; |
4282 | ||
4283 | /* Don't bother for one word. */ | |
4284 | if (len < 3 * sizeof (long)) | |
4285 | return 0; | |
4286 | ||
4287 | /* We could keep this file open and cache it - possibly one per | |
4288 | thread. That requires some juggling, but is even faster. */ | |
4289 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
4290 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
4291 | if (fd == -1) | |
4292 | return 0; | |
4293 | ||
4294 | /* If pread64 is available, use it. It's faster if the kernel | |
4295 | supports it (only one syscall), and it's 64-bit safe even on | |
4296 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4297 | application). */ | |
4298 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4299 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4300 | #else |
10d6c8cd | 4301 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4302 | #endif |
4303 | ret = 0; | |
4304 | else | |
4305 | ret = len; | |
4306 | ||
4307 | close (fd); | |
4308 | return ret; | |
4309 | } | |
4310 | ||
efcbbd14 UW |
4311 | |
4312 | /* Enumerate spufs IDs for process PID. */ | |
4313 | static LONGEST | |
4314 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
4315 | { | |
4316 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
4317 | LONGEST pos = 0; | |
4318 | LONGEST written = 0; | |
4319 | char path[128]; | |
4320 | DIR *dir; | |
4321 | struct dirent *entry; | |
4322 | ||
4323 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4324 | dir = opendir (path); | |
4325 | if (!dir) | |
4326 | return -1; | |
4327 | ||
4328 | rewinddir (dir); | |
4329 | while ((entry = readdir (dir)) != NULL) | |
4330 | { | |
4331 | struct stat st; | |
4332 | struct statfs stfs; | |
4333 | int fd; | |
4334 | ||
4335 | fd = atoi (entry->d_name); | |
4336 | if (!fd) | |
4337 | continue; | |
4338 | ||
4339 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4340 | if (stat (path, &st) != 0) | |
4341 | continue; | |
4342 | if (!S_ISDIR (st.st_mode)) | |
4343 | continue; | |
4344 | ||
4345 | if (statfs (path, &stfs) != 0) | |
4346 | continue; | |
4347 | if (stfs.f_type != SPUFS_MAGIC) | |
4348 | continue; | |
4349 | ||
4350 | if (pos >= offset && pos + 4 <= offset + len) | |
4351 | { | |
4352 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
4353 | written += 4; | |
4354 | } | |
4355 | pos += 4; | |
4356 | } | |
4357 | ||
4358 | closedir (dir); | |
4359 | return written; | |
4360 | } | |
4361 | ||
4362 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4363 | object type, using the /proc file system. */ | |
4364 | static LONGEST | |
4365 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
4366 | const char *annex, gdb_byte *readbuf, | |
4367 | const gdb_byte *writebuf, | |
4368 | ULONGEST offset, LONGEST len) | |
4369 | { | |
4370 | char buf[128]; | |
4371 | int fd = 0; | |
4372 | int ret = -1; | |
4373 | int pid = PIDGET (inferior_ptid); | |
4374 | ||
4375 | if (!annex) | |
4376 | { | |
4377 | if (!readbuf) | |
4378 | return -1; | |
4379 | else | |
4380 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4381 | } | |
4382 | ||
4383 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
4384 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4385 | if (fd <= 0) | |
4386 | return -1; | |
4387 | ||
4388 | if (offset != 0 | |
4389 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4390 | { | |
4391 | close (fd); | |
4392 | return 0; | |
4393 | } | |
4394 | ||
4395 | if (writebuf) | |
4396 | ret = write (fd, writebuf, (size_t) len); | |
4397 | else if (readbuf) | |
4398 | ret = read (fd, readbuf, (size_t) len); | |
4399 | ||
4400 | close (fd); | |
4401 | return ret; | |
4402 | } | |
4403 | ||
4404 | ||
dba24537 AC |
4405 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
4406 | ||
4407 | static void | |
4408 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4409 | { | |
4410 | int len = strlen (line) - 1; | |
4411 | const char *p; | |
4412 | int signum; | |
4413 | ||
4414 | if (line[len] != '\n') | |
8a3fe4f8 | 4415 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4416 | |
4417 | p = line; | |
4418 | signum = len * 4; | |
4419 | while (len-- > 0) | |
4420 | { | |
4421 | int digit; | |
4422 | ||
4423 | if (*p >= '0' && *p <= '9') | |
4424 | digit = *p - '0'; | |
4425 | else if (*p >= 'a' && *p <= 'f') | |
4426 | digit = *p - 'a' + 10; | |
4427 | else | |
8a3fe4f8 | 4428 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4429 | |
4430 | signum -= 4; | |
4431 | ||
4432 | if (digit & 1) | |
4433 | sigaddset (sigs, signum + 1); | |
4434 | if (digit & 2) | |
4435 | sigaddset (sigs, signum + 2); | |
4436 | if (digit & 4) | |
4437 | sigaddset (sigs, signum + 3); | |
4438 | if (digit & 8) | |
4439 | sigaddset (sigs, signum + 4); | |
4440 | ||
4441 | p++; | |
4442 | } | |
4443 | } | |
4444 | ||
4445 | /* Find process PID's pending signals from /proc/pid/status and set | |
4446 | SIGS to match. */ | |
4447 | ||
4448 | void | |
4449 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
4450 | { | |
4451 | FILE *procfile; | |
4452 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
4453 | int signum; | |
7c8a8b04 | 4454 | struct cleanup *cleanup; |
dba24537 AC |
4455 | |
4456 | sigemptyset (pending); | |
4457 | sigemptyset (blocked); | |
4458 | sigemptyset (ignored); | |
4459 | sprintf (fname, "/proc/%d/status", pid); | |
4460 | procfile = fopen (fname, "r"); | |
4461 | if (procfile == NULL) | |
8a3fe4f8 | 4462 | error (_("Could not open %s"), fname); |
7c8a8b04 | 4463 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4464 | |
4465 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
4466 | { | |
4467 | /* Normal queued signals are on the SigPnd line in the status | |
4468 | file. However, 2.6 kernels also have a "shared" pending | |
4469 | queue for delivering signals to a thread group, so check for | |
4470 | a ShdPnd line also. | |
4471 | ||
4472 | Unfortunately some Red Hat kernels include the shared pending | |
4473 | queue but not the ShdPnd status field. */ | |
4474 | ||
4475 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
4476 | add_line_to_sigset (buffer + 8, pending); | |
4477 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
4478 | add_line_to_sigset (buffer + 8, pending); | |
4479 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
4480 | add_line_to_sigset (buffer + 8, blocked); | |
4481 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
4482 | add_line_to_sigset (buffer + 8, ignored); | |
4483 | } | |
4484 | ||
7c8a8b04 | 4485 | do_cleanups (cleanup); |
dba24537 AC |
4486 | } |
4487 | ||
07e059b5 VP |
4488 | static LONGEST |
4489 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
4490 | const char *annex, gdb_byte *readbuf, | |
4491 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4492 | { | |
4493 | /* We make the process list snapshot when the object starts to be | |
4494 | read. */ | |
4495 | static const char *buf; | |
4496 | static LONGEST len_avail = -1; | |
4497 | static struct obstack obstack; | |
4498 | ||
4499 | DIR *dirp; | |
4500 | ||
4501 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
4502 | ||
4503 | if (strcmp (annex, "processes") != 0) | |
4504 | return 0; | |
4505 | ||
4506 | gdb_assert (readbuf && !writebuf); | |
4507 | ||
4508 | if (offset == 0) | |
4509 | { | |
4510 | if (len_avail != -1 && len_avail != 0) | |
4511 | obstack_free (&obstack, NULL); | |
4512 | len_avail = 0; | |
4513 | buf = NULL; | |
4514 | obstack_init (&obstack); | |
4515 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
4516 | ||
4517 | dirp = opendir ("/proc"); | |
4518 | if (dirp) | |
4519 | { | |
4520 | struct dirent *dp; | |
4521 | while ((dp = readdir (dirp)) != NULL) | |
4522 | { | |
4523 | struct stat statbuf; | |
4524 | char procentry[sizeof ("/proc/4294967295")]; | |
4525 | ||
4526 | if (!isdigit (dp->d_name[0]) | |
1a6d2f2f | 4527 | || NAMELEN (dp) > sizeof ("4294967295") - 1) |
07e059b5 VP |
4528 | continue; |
4529 | ||
4530 | sprintf (procentry, "/proc/%s", dp->d_name); | |
4531 | if (stat (procentry, &statbuf) == 0 | |
4532 | && S_ISDIR (statbuf.st_mode)) | |
4533 | { | |
4534 | char *pathname; | |
4535 | FILE *f; | |
4536 | char cmd[MAXPATHLEN + 1]; | |
4537 | struct passwd *entry; | |
4538 | ||
4539 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
4540 | entry = getpwuid (statbuf.st_uid); | |
4541 | ||
4542 | if ((f = fopen (pathname, "r")) != NULL) | |
4543 | { | |
4544 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
4545 | if (len > 0) | |
4546 | { | |
4547 | int i; | |
4548 | for (i = 0; i < len; i++) | |
4549 | if (cmd[i] == '\0') | |
4550 | cmd[i] = ' '; | |
4551 | cmd[len] = '\0'; | |
4552 | ||
4553 | obstack_xml_printf ( | |
4554 | &obstack, | |
4555 | "<item>" | |
4556 | "<column name=\"pid\">%s</column>" | |
4557 | "<column name=\"user\">%s</column>" | |
4558 | "<column name=\"command\">%s</column>" | |
4559 | "</item>", | |
4560 | dp->d_name, | |
4561 | entry ? entry->pw_name : "?", | |
4562 | cmd); | |
4563 | } | |
4564 | fclose (f); | |
4565 | } | |
4566 | ||
4567 | xfree (pathname); | |
4568 | } | |
4569 | } | |
4570 | ||
4571 | closedir (dirp); | |
4572 | } | |
4573 | ||
4574 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
4575 | buf = obstack_finish (&obstack); | |
4576 | len_avail = strlen (buf); | |
4577 | } | |
4578 | ||
4579 | if (offset >= len_avail) | |
4580 | { | |
4581 | /* Done. Get rid of the obstack. */ | |
4582 | obstack_free (&obstack, NULL); | |
4583 | buf = NULL; | |
4584 | len_avail = 0; | |
4585 | return 0; | |
4586 | } | |
4587 | ||
4588 | if (len > len_avail - offset) | |
4589 | len = len_avail - offset; | |
4590 | memcpy (readbuf, buf + offset, len); | |
4591 | ||
4592 | return len; | |
4593 | } | |
4594 | ||
10d6c8cd DJ |
4595 | static LONGEST |
4596 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
4597 | const char *annex, gdb_byte *readbuf, | |
4598 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4599 | { | |
4600 | LONGEST xfer; | |
4601 | ||
4602 | if (object == TARGET_OBJECT_AUXV) | |
4603 | return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf, | |
4604 | offset, len); | |
4605 | ||
07e059b5 VP |
4606 | if (object == TARGET_OBJECT_OSDATA) |
4607 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
4608 | offset, len); | |
4609 | ||
efcbbd14 UW |
4610 | if (object == TARGET_OBJECT_SPU) |
4611 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
4612 | offset, len); | |
4613 | ||
8f313923 JK |
4614 | /* GDB calculates all the addresses in possibly larget width of the address. |
4615 | Address width needs to be masked before its final use - either by | |
4616 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
4617 | ||
4618 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
4619 | ||
4620 | if (object == TARGET_OBJECT_MEMORY) | |
4621 | { | |
4622 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
4623 | ||
4624 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
4625 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
4626 | } | |
4627 | ||
10d6c8cd DJ |
4628 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
4629 | offset, len); | |
4630 | if (xfer != 0) | |
4631 | return xfer; | |
4632 | ||
4633 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
4634 | offset, len); | |
4635 | } | |
4636 | ||
e9efe249 | 4637 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
4638 | it with local methods. */ |
4639 | ||
910122bf UW |
4640 | static void |
4641 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 4642 | { |
6d8fd2b7 UW |
4643 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
4644 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; | |
4645 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; | |
a96d9b2e | 4646 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 4647 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 4648 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
4649 | t->to_post_attach = linux_child_post_attach; |
4650 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
4651 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
4652 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
4653 | ||
4654 | super_xfer_partial = t->to_xfer_partial; | |
4655 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
4656 | } |
4657 | ||
4658 | struct target_ops * | |
4659 | linux_target (void) | |
4660 | { | |
4661 | struct target_ops *t; | |
4662 | ||
4663 | t = inf_ptrace_target (); | |
4664 | linux_target_install_ops (t); | |
4665 | ||
4666 | return t; | |
4667 | } | |
4668 | ||
4669 | struct target_ops * | |
7714d83a | 4670 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
4671 | { |
4672 | struct target_ops *t; | |
4673 | ||
4674 | t = inf_ptrace_trad_target (register_u_offset); | |
4675 | linux_target_install_ops (t); | |
10d6c8cd | 4676 | |
10d6c8cd DJ |
4677 | return t; |
4678 | } | |
4679 | ||
b84876c2 PA |
4680 | /* target_is_async_p implementation. */ |
4681 | ||
4682 | static int | |
4683 | linux_nat_is_async_p (void) | |
4684 | { | |
4685 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 4686 | it explicitly with the "set target-async" command. |
b84876c2 | 4687 | Someday, linux will always be async. */ |
c6ebd6cf | 4688 | if (!target_async_permitted) |
b84876c2 PA |
4689 | return 0; |
4690 | ||
d90e17a7 PA |
4691 | /* See target.h/target_async_mask. */ |
4692 | return linux_nat_async_mask_value; | |
b84876c2 PA |
4693 | } |
4694 | ||
4695 | /* target_can_async_p implementation. */ | |
4696 | ||
4697 | static int | |
4698 | linux_nat_can_async_p (void) | |
4699 | { | |
4700 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 4701 | it explicitly with the "set target-async" command. |
b84876c2 | 4702 | Someday, linux will always be async. */ |
c6ebd6cf | 4703 | if (!target_async_permitted) |
b84876c2 PA |
4704 | return 0; |
4705 | ||
4706 | /* See target.h/target_async_mask. */ | |
4707 | return linux_nat_async_mask_value; | |
4708 | } | |
4709 | ||
9908b566 VP |
4710 | static int |
4711 | linux_nat_supports_non_stop (void) | |
4712 | { | |
4713 | return 1; | |
4714 | } | |
4715 | ||
d90e17a7 PA |
4716 | /* True if we want to support multi-process. To be removed when GDB |
4717 | supports multi-exec. */ | |
4718 | ||
2277426b | 4719 | int linux_multi_process = 1; |
d90e17a7 PA |
4720 | |
4721 | static int | |
4722 | linux_nat_supports_multi_process (void) | |
4723 | { | |
4724 | return linux_multi_process; | |
4725 | } | |
4726 | ||
b84876c2 PA |
4727 | /* target_async_mask implementation. */ |
4728 | ||
4729 | static int | |
7feb7d06 | 4730 | linux_nat_async_mask (int new_mask) |
b84876c2 | 4731 | { |
7feb7d06 | 4732 | int curr_mask = linux_nat_async_mask_value; |
b84876c2 | 4733 | |
7feb7d06 | 4734 | if (curr_mask != new_mask) |
b84876c2 | 4735 | { |
7feb7d06 | 4736 | if (new_mask == 0) |
b84876c2 PA |
4737 | { |
4738 | linux_nat_async (NULL, 0); | |
7feb7d06 | 4739 | linux_nat_async_mask_value = new_mask; |
b84876c2 PA |
4740 | } |
4741 | else | |
4742 | { | |
7feb7d06 | 4743 | linux_nat_async_mask_value = new_mask; |
84e46146 | 4744 | |
7feb7d06 PA |
4745 | /* If we're going out of async-mask in all-stop, then the |
4746 | inferior is stopped. The next resume will call | |
4747 | target_async. In non-stop, the target event source | |
4748 | should be always registered in the event loop. Do so | |
4749 | now. */ | |
4750 | if (non_stop) | |
4751 | linux_nat_async (inferior_event_handler, 0); | |
b84876c2 PA |
4752 | } |
4753 | } | |
4754 | ||
7feb7d06 | 4755 | return curr_mask; |
b84876c2 PA |
4756 | } |
4757 | ||
4758 | static int async_terminal_is_ours = 1; | |
4759 | ||
4760 | /* target_terminal_inferior implementation. */ | |
4761 | ||
4762 | static void | |
4763 | linux_nat_terminal_inferior (void) | |
4764 | { | |
4765 | if (!target_is_async_p ()) | |
4766 | { | |
4767 | /* Async mode is disabled. */ | |
4768 | terminal_inferior (); | |
4769 | return; | |
4770 | } | |
4771 | ||
b84876c2 PA |
4772 | terminal_inferior (); |
4773 | ||
d9d2d8b6 | 4774 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
4775 | if (!async_terminal_is_ours) |
4776 | return; | |
4777 | ||
4778 | delete_file_handler (input_fd); | |
4779 | async_terminal_is_ours = 0; | |
4780 | set_sigint_trap (); | |
4781 | } | |
4782 | ||
4783 | /* target_terminal_ours implementation. */ | |
4784 | ||
2c0b251b | 4785 | static void |
b84876c2 PA |
4786 | linux_nat_terminal_ours (void) |
4787 | { | |
4788 | if (!target_is_async_p ()) | |
4789 | { | |
4790 | /* Async mode is disabled. */ | |
4791 | terminal_ours (); | |
4792 | return; | |
4793 | } | |
4794 | ||
4795 | /* GDB should never give the terminal to the inferior if the | |
4796 | inferior is running in the background (run&, continue&, etc.), | |
4797 | but claiming it sure should. */ | |
4798 | terminal_ours (); | |
4799 | ||
b84876c2 PA |
4800 | if (async_terminal_is_ours) |
4801 | return; | |
4802 | ||
4803 | clear_sigint_trap (); | |
4804 | add_file_handler (input_fd, stdin_event_handler, 0); | |
4805 | async_terminal_is_ours = 1; | |
4806 | } | |
4807 | ||
4808 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
4809 | void *context); | |
4810 | static void *async_client_context; | |
4811 | ||
7feb7d06 PA |
4812 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4813 | so we notice when any child changes state, and notify the | |
4814 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
4815 | above to wait for the arrival of a SIGCHLD. */ | |
4816 | ||
b84876c2 | 4817 | static void |
7feb7d06 | 4818 | sigchld_handler (int signo) |
b84876c2 | 4819 | { |
7feb7d06 PA |
4820 | int old_errno = errno; |
4821 | ||
4822 | if (debug_linux_nat_async) | |
4823 | fprintf_unfiltered (gdb_stdlog, "sigchld\n"); | |
4824 | ||
4825 | if (signo == SIGCHLD | |
4826 | && linux_nat_event_pipe[0] != -1) | |
4827 | async_file_mark (); /* Let the event loop know that there are | |
4828 | events to handle. */ | |
4829 | ||
4830 | errno = old_errno; | |
4831 | } | |
4832 | ||
4833 | /* Callback registered with the target events file descriptor. */ | |
4834 | ||
4835 | static void | |
4836 | handle_target_event (int error, gdb_client_data client_data) | |
4837 | { | |
4838 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
4839 | } | |
4840 | ||
4841 | /* Create/destroy the target events pipe. Returns previous state. */ | |
4842 | ||
4843 | static int | |
4844 | linux_async_pipe (int enable) | |
4845 | { | |
4846 | int previous = (linux_nat_event_pipe[0] != -1); | |
4847 | ||
4848 | if (previous != enable) | |
4849 | { | |
4850 | sigset_t prev_mask; | |
4851 | ||
4852 | block_child_signals (&prev_mask); | |
4853 | ||
4854 | if (enable) | |
4855 | { | |
4856 | if (pipe (linux_nat_event_pipe) == -1) | |
4857 | internal_error (__FILE__, __LINE__, | |
4858 | "creating event pipe failed."); | |
4859 | ||
4860 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4861 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4862 | } | |
4863 | else | |
4864 | { | |
4865 | close (linux_nat_event_pipe[0]); | |
4866 | close (linux_nat_event_pipe[1]); | |
4867 | linux_nat_event_pipe[0] = -1; | |
4868 | linux_nat_event_pipe[1] = -1; | |
4869 | } | |
4870 | ||
4871 | restore_child_signals_mask (&prev_mask); | |
4872 | } | |
4873 | ||
4874 | return previous; | |
b84876c2 PA |
4875 | } |
4876 | ||
4877 | /* target_async implementation. */ | |
4878 | ||
4879 | static void | |
4880 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
4881 | void *context), void *context) | |
4882 | { | |
c6ebd6cf | 4883 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
4884 | internal_error (__FILE__, __LINE__, |
4885 | "Calling target_async when async is masked"); | |
4886 | ||
4887 | if (callback != NULL) | |
4888 | { | |
4889 | async_client_callback = callback; | |
4890 | async_client_context = context; | |
7feb7d06 PA |
4891 | if (!linux_async_pipe (1)) |
4892 | { | |
4893 | add_file_handler (linux_nat_event_pipe[0], | |
4894 | handle_target_event, NULL); | |
4895 | /* There may be pending events to handle. Tell the event loop | |
4896 | to poll them. */ | |
4897 | async_file_mark (); | |
4898 | } | |
b84876c2 PA |
4899 | } |
4900 | else | |
4901 | { | |
4902 | async_client_callback = callback; | |
4903 | async_client_context = context; | |
b84876c2 | 4904 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 4905 | linux_async_pipe (0); |
b84876c2 PA |
4906 | } |
4907 | return; | |
4908 | } | |
4909 | ||
252fbfc8 PA |
4910 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
4911 | event came out. */ | |
4912 | ||
4c28f408 | 4913 | static int |
252fbfc8 | 4914 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 4915 | { |
d90e17a7 | 4916 | if (!lwp->stopped) |
252fbfc8 | 4917 | { |
d90e17a7 PA |
4918 | int pid, status; |
4919 | ptid_t ptid = lwp->ptid; | |
252fbfc8 | 4920 | |
d90e17a7 PA |
4921 | if (debug_linux_nat) |
4922 | fprintf_unfiltered (gdb_stdlog, | |
4923 | "LNSL: running -> suspending %s\n", | |
4924 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 4925 | |
252fbfc8 | 4926 | |
d90e17a7 PA |
4927 | stop_callback (lwp, NULL); |
4928 | stop_wait_callback (lwp, NULL); | |
252fbfc8 | 4929 | |
d90e17a7 PA |
4930 | /* If the lwp exits while we try to stop it, there's nothing |
4931 | else to do. */ | |
4932 | lwp = find_lwp_pid (ptid); | |
4933 | if (lwp == NULL) | |
4934 | return 0; | |
252fbfc8 | 4935 | |
d90e17a7 PA |
4936 | /* If we didn't collect any signal other than SIGSTOP while |
4937 | stopping the LWP, push a SIGNAL_0 event. In either case, the | |
4938 | event-loop will end up calling target_wait which will collect | |
4939 | these. */ | |
4940 | if (lwp->status == 0) | |
4941 | lwp->status = W_STOPCODE (0); | |
4942 | async_file_mark (); | |
4943 | } | |
4944 | else | |
4945 | { | |
4946 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 4947 | |
d90e17a7 PA |
4948 | if (debug_linux_nat) |
4949 | { | |
e09875d4 | 4950 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
d90e17a7 | 4951 | fprintf_unfiltered (gdb_stdlog, "\ |
252fbfc8 | 4952 | LNSL: already stopped/stop_requested %s\n", |
d90e17a7 PA |
4953 | target_pid_to_str (lwp->ptid)); |
4954 | else | |
4955 | fprintf_unfiltered (gdb_stdlog, "\ | |
252fbfc8 | 4956 | LNSL: already stopped/no stop_requested yet %s\n", |
d90e17a7 | 4957 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
4958 | } |
4959 | } | |
4c28f408 PA |
4960 | return 0; |
4961 | } | |
4962 | ||
4963 | static void | |
4964 | linux_nat_stop (ptid_t ptid) | |
4965 | { | |
4966 | if (non_stop) | |
d90e17a7 | 4967 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
4968 | else |
4969 | linux_ops->to_stop (ptid); | |
4970 | } | |
4971 | ||
d90e17a7 PA |
4972 | static void |
4973 | linux_nat_close (int quitting) | |
4974 | { | |
4975 | /* Unregister from the event loop. */ | |
4976 | if (target_is_async_p ()) | |
4977 | target_async (NULL, 0); | |
4978 | ||
4979 | /* Reset the async_masking. */ | |
4980 | linux_nat_async_mask_value = 1; | |
4981 | ||
4982 | if (linux_ops->to_close) | |
4983 | linux_ops->to_close (quitting); | |
4984 | } | |
4985 | ||
f973ed9c DJ |
4986 | void |
4987 | linux_nat_add_target (struct target_ops *t) | |
4988 | { | |
f973ed9c DJ |
4989 | /* Save the provided single-threaded target. We save this in a separate |
4990 | variable because another target we've inherited from (e.g. inf-ptrace) | |
4991 | may have saved a pointer to T; we want to use it for the final | |
4992 | process stratum target. */ | |
4993 | linux_ops_saved = *t; | |
4994 | linux_ops = &linux_ops_saved; | |
4995 | ||
4996 | /* Override some methods for multithreading. */ | |
b84876c2 | 4997 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
4998 | t->to_attach = linux_nat_attach; |
4999 | t->to_detach = linux_nat_detach; | |
5000 | t->to_resume = linux_nat_resume; | |
5001 | t->to_wait = linux_nat_wait; | |
5002 | t->to_xfer_partial = linux_nat_xfer_partial; | |
5003 | t->to_kill = linux_nat_kill; | |
5004 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
5005 | t->to_thread_alive = linux_nat_thread_alive; | |
5006 | t->to_pid_to_str = linux_nat_pid_to_str; | |
5007 | t->to_has_thread_control = tc_schedlock; | |
5008 | ||
b84876c2 PA |
5009 | t->to_can_async_p = linux_nat_can_async_p; |
5010 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5011 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
5012 | t->to_async = linux_nat_async; |
5013 | t->to_async_mask = linux_nat_async_mask; | |
5014 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
5015 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5016 | t->to_close = linux_nat_close; |
b84876c2 | 5017 | |
4c28f408 PA |
5018 | /* Methods for non-stop support. */ |
5019 | t->to_stop = linux_nat_stop; | |
5020 | ||
d90e17a7 PA |
5021 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5022 | ||
f973ed9c DJ |
5023 | /* We don't change the stratum; this target will sit at |
5024 | process_stratum and thread_db will set at thread_stratum. This | |
5025 | is a little strange, since this is a multi-threaded-capable | |
5026 | target, but we want to be on the stack below thread_db, and we | |
5027 | also want to be used for single-threaded processes. */ | |
5028 | ||
5029 | add_target (t); | |
f973ed9c DJ |
5030 | } |
5031 | ||
9f0bdab8 DJ |
5032 | /* Register a method to call whenever a new thread is attached. */ |
5033 | void | |
5034 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5035 | { | |
5036 | /* Save the pointer. We only support a single registered instance | |
5037 | of the GNU/Linux native target, so we do not need to map this to | |
5038 | T. */ | |
5039 | linux_nat_new_thread = new_thread; | |
5040 | } | |
5041 | ||
5b009018 PA |
5042 | /* Register a method that converts a siginfo object between the layout |
5043 | that ptrace returns, and the layout in the architecture of the | |
5044 | inferior. */ | |
5045 | void | |
5046 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5047 | int (*siginfo_fixup) (struct siginfo *, | |
5048 | gdb_byte *, | |
5049 | int)) | |
5050 | { | |
5051 | /* Save the pointer. */ | |
5052 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5053 | } | |
5054 | ||
9f0bdab8 DJ |
5055 | /* Return the saved siginfo associated with PTID. */ |
5056 | struct siginfo * | |
5057 | linux_nat_get_siginfo (ptid_t ptid) | |
5058 | { | |
5059 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5060 | ||
5061 | gdb_assert (lp != NULL); | |
5062 | ||
5063 | return &lp->siginfo; | |
5064 | } | |
5065 | ||
2c0b251b PA |
5066 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5067 | extern initialize_file_ftype _initialize_linux_nat; | |
5068 | ||
d6b0e80f AC |
5069 | void |
5070 | _initialize_linux_nat (void) | |
5071 | { | |
b84876c2 | 5072 | sigset_t mask; |
dba24537 | 5073 | |
1bedd215 AC |
5074 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
5075 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
5076 | Specify any process id, or use the program being debugged by default.\n\ |
5077 | Specify any of the following keywords for detailed info:\n\ | |
5078 | mappings -- list of mapped memory regions.\n\ | |
5079 | stat -- list a bunch of random process info.\n\ | |
5080 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 5081 | all -- list all available /proc info.")); |
d6b0e80f | 5082 | |
b84876c2 PA |
5083 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5084 | &debug_linux_nat, _("\ | |
5085 | Set debugging of GNU/Linux lwp module."), _("\ | |
5086 | Show debugging of GNU/Linux lwp module."), _("\ | |
5087 | Enables printf debugging output."), | |
5088 | NULL, | |
5089 | show_debug_linux_nat, | |
5090 | &setdebuglist, &showdebuglist); | |
5091 | ||
5092 | add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance, | |
5093 | &debug_linux_nat_async, _("\ | |
5094 | Set debugging of GNU/Linux async lwp module."), _("\ | |
5095 | Show debugging of GNU/Linux async lwp module."), _("\ | |
5096 | Enables printf debugging output."), | |
5097 | NULL, | |
5098 | show_debug_linux_nat_async, | |
5099 | &setdebuglist, &showdebuglist); | |
5100 | ||
b84876c2 | 5101 | /* Save this mask as the default. */ |
d6b0e80f AC |
5102 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5103 | ||
7feb7d06 PA |
5104 | /* Install a SIGCHLD handler. */ |
5105 | sigchld_action.sa_handler = sigchld_handler; | |
5106 | sigemptyset (&sigchld_action.sa_mask); | |
5107 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5108 | |
5109 | /* Make it the default. */ | |
7feb7d06 | 5110 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5111 | |
5112 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5113 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5114 | sigdelset (&suspend_mask, SIGCHLD); | |
5115 | ||
7feb7d06 | 5116 | sigemptyset (&blocked_mask); |
10568435 JK |
5117 | |
5118 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
5119 | &disable_randomization, _("\ | |
5120 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
5121 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
5122 | When this mode is on (which is the default), randomization of the virtual\n\ | |
5123 | address space is disabled. Standalone programs run with the randomization\n\ | |
5124 | enabled by default on some platforms."), | |
5125 | &set_disable_randomization, | |
5126 | &show_disable_randomization, | |
5127 | &setlist, &showlist); | |
d6b0e80f AC |
5128 | } |
5129 | \f | |
5130 | ||
5131 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5132 | the GNU/Linux Threads library and therefore doesn't really belong | |
5133 | here. */ | |
5134 | ||
5135 | /* Read variable NAME in the target and return its value if found. | |
5136 | Otherwise return zero. It is assumed that the type of the variable | |
5137 | is `int'. */ | |
5138 | ||
5139 | static int | |
5140 | get_signo (const char *name) | |
5141 | { | |
5142 | struct minimal_symbol *ms; | |
5143 | int signo; | |
5144 | ||
5145 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5146 | if (ms == NULL) | |
5147 | return 0; | |
5148 | ||
8e70166d | 5149 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5150 | sizeof (signo)) != 0) |
5151 | return 0; | |
5152 | ||
5153 | return signo; | |
5154 | } | |
5155 | ||
5156 | /* Return the set of signals used by the threads library in *SET. */ | |
5157 | ||
5158 | void | |
5159 | lin_thread_get_thread_signals (sigset_t *set) | |
5160 | { | |
5161 | struct sigaction action; | |
5162 | int restart, cancel; | |
5163 | ||
b84876c2 | 5164 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5165 | sigemptyset (set); |
5166 | ||
5167 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5168 | cancel = get_signo ("__pthread_sig_cancel"); |
5169 | ||
5170 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5171 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5172 | not provide any way for the debugger to query the signal numbers - | |
5173 | fortunately they don't change! */ | |
5174 | ||
d6b0e80f | 5175 | if (restart == 0) |
17fbb0bd | 5176 | restart = __SIGRTMIN; |
d6b0e80f | 5177 | |
d6b0e80f | 5178 | if (cancel == 0) |
17fbb0bd | 5179 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5180 | |
5181 | sigaddset (set, restart); | |
5182 | sigaddset (set, cancel); | |
5183 | ||
5184 | /* The GNU/Linux Threads library makes terminating threads send a | |
5185 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
5186 | those (to prevent them from terminating GDB itself, which is | |
5187 | likely to be their default action) and treat them the same way as | |
5188 | SIGCHLD. */ | |
5189 | ||
5190 | action.sa_handler = sigchld_handler; | |
5191 | sigemptyset (&action.sa_mask); | |
58aecb61 | 5192 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
5193 | sigaction (cancel, &action, NULL); |
5194 | ||
5195 | /* We block the "cancel" signal throughout this code ... */ | |
5196 | sigaddset (&blocked_mask, cancel); | |
5197 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
5198 | ||
5199 | /* ... except during a sigsuspend. */ | |
5200 | sigdelset (&suspend_mask, cancel); | |
5201 | } |