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" |
dba24537 | 57 | |
10568435 JK |
58 | #ifdef HAVE_PERSONALITY |
59 | # include <sys/personality.h> | |
60 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
61 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
62 | # endif | |
63 | #endif /* HAVE_PERSONALITY */ | |
64 | ||
8a77dff3 VP |
65 | /* This comment documents high-level logic of this file. |
66 | ||
67 | Waiting for events in sync mode | |
68 | =============================== | |
69 | ||
70 | When waiting for an event in a specific thread, we just use waitpid, passing | |
71 | the specific pid, and not passing WNOHANG. | |
72 | ||
73 | When waiting for an event in all threads, waitpid is not quite good. Prior to | |
74 | version 2.4, Linux can either wait for event in main thread, or in secondary | |
75 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might | |
76 | miss an event. The solution is to use non-blocking waitpid, together with | |
77 | sigsuspend. First, we use non-blocking waitpid to get an event in the main | |
78 | process, if any. Second, we use non-blocking waitpid with the __WCLONED | |
79 | flag to check for events in cloned processes. If nothing is found, we use | |
80 | sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something | |
81 | happened to a child process -- and SIGCHLD will be delivered both for events | |
82 | in main debugged process and in cloned processes. As soon as we know there's | |
83 | an event, we get back to calling nonblocking waitpid with and without __WCLONED. | |
84 | ||
85 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
86 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's | |
87 | blocked, the signal becomes pending and sigsuspend immediately | |
88 | notices it and returns. | |
89 | ||
90 | Waiting for events in async mode | |
91 | ================================ | |
92 | ||
7feb7d06 PA |
93 | In async mode, GDB should always be ready to handle both user input |
94 | and target events, so neither blocking waitpid nor sigsuspend are | |
95 | viable options. Instead, we should asynchronously notify the GDB main | |
96 | event loop whenever there's an unprocessed event from the target. We | |
97 | detect asynchronous target events by handling SIGCHLD signals. To | |
98 | notify the event loop about target events, the self-pipe trick is used | |
99 | --- a pipe is registered as waitable event source in the event loop, | |
100 | the event loop select/poll's on the read end of this pipe (as well on | |
101 | other event sources, e.g., stdin), and the SIGCHLD handler writes a | |
102 | byte to this pipe. This is more portable than relying on | |
103 | pselect/ppoll, since on kernels that lack those syscalls, libc | |
104 | emulates them with select/poll+sigprocmask, and that is racy | |
105 | (a.k.a. plain broken). | |
106 | ||
107 | Obviously, if we fail to notify the event loop if there's a target | |
108 | event, it's bad. OTOH, if we notify the event loop when there's no | |
109 | event from the target, linux_nat_wait will detect that there's no real | |
110 | event to report, and return event of type TARGET_WAITKIND_IGNORE. | |
111 | This is mostly harmless, but it will waste time and is better avoided. | |
112 | ||
113 | The main design point is that every time GDB is outside linux-nat.c, | |
114 | we have a SIGCHLD handler installed that is called when something | |
115 | happens to the target and notifies the GDB event loop. Whenever GDB | |
116 | core decides to handle the event, and calls into linux-nat.c, we | |
117 | process things as in sync mode, except that the we never block in | |
118 | sigsuspend. | |
119 | ||
120 | While processing an event, we may end up momentarily blocked in | |
121 | waitpid calls. Those waitpid calls, while blocking, are guarantied to | |
122 | return quickly. E.g., in all-stop mode, before reporting to the core | |
123 | that an LWP hit a breakpoint, all LWPs are stopped by sending them | |
124 | SIGSTOP, and synchronously waiting for the SIGSTOP to be reported. | |
125 | Note that this is different from blocking indefinitely waiting for the | |
126 | next event --- here, we're already handling an event. | |
8a77dff3 VP |
127 | |
128 | Use of signals | |
129 | ============== | |
130 | ||
131 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
132 | signal is not entirely significant; we just need for a signal to be delivered, | |
133 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
134 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
135 | be queued once; we do not keep track of other sources of SIGSTOP. | |
136 | ||
137 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
138 | use them, because they have special behavior when the signal is generated - | |
139 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
140 | kills the entire thread group. | |
141 | ||
142 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
143 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
144 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
145 | ||
146 | We could use a real-time signal instead. This would solve those problems; we | |
147 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
148 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
149 | generates it, and there are races with trying to find a signal that is not | |
150 | blocked. */ | |
a0ef4274 | 151 | |
dba24537 AC |
152 | #ifndef O_LARGEFILE |
153 | #define O_LARGEFILE 0 | |
154 | #endif | |
0274a8ce | 155 | |
3993f6b1 DJ |
156 | /* If the system headers did not provide the constants, hard-code the normal |
157 | values. */ | |
158 | #ifndef PTRACE_EVENT_FORK | |
159 | ||
160 | #define PTRACE_SETOPTIONS 0x4200 | |
161 | #define PTRACE_GETEVENTMSG 0x4201 | |
162 | ||
163 | /* options set using PTRACE_SETOPTIONS */ | |
164 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
165 | #define PTRACE_O_TRACEFORK 0x00000002 | |
166 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
167 | #define PTRACE_O_TRACECLONE 0x00000008 | |
168 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
9016a515 DJ |
169 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
170 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
3993f6b1 DJ |
171 | |
172 | /* Wait extended result codes for the above trace options. */ | |
173 | #define PTRACE_EVENT_FORK 1 | |
174 | #define PTRACE_EVENT_VFORK 2 | |
175 | #define PTRACE_EVENT_CLONE 3 | |
176 | #define PTRACE_EVENT_EXEC 4 | |
c874c7fc | 177 | #define PTRACE_EVENT_VFORK_DONE 5 |
9016a515 | 178 | #define PTRACE_EVENT_EXIT 6 |
3993f6b1 DJ |
179 | |
180 | #endif /* PTRACE_EVENT_FORK */ | |
181 | ||
182 | /* We can't always assume that this flag is available, but all systems | |
183 | with the ptrace event handlers also have __WALL, so it's safe to use | |
184 | here. */ | |
185 | #ifndef __WALL | |
186 | #define __WALL 0x40000000 /* Wait for any child. */ | |
187 | #endif | |
188 | ||
02d3ff8c | 189 | #ifndef PTRACE_GETSIGINFO |
1ef18d08 PA |
190 | # define PTRACE_GETSIGINFO 0x4202 |
191 | # define PTRACE_SETSIGINFO 0x4203 | |
02d3ff8c UW |
192 | #endif |
193 | ||
10d6c8cd DJ |
194 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
195 | the use of the multi-threaded target. */ | |
196 | static struct target_ops *linux_ops; | |
f973ed9c | 197 | static struct target_ops linux_ops_saved; |
10d6c8cd | 198 | |
9f0bdab8 DJ |
199 | /* The method to call, if any, when a new thread is attached. */ |
200 | static void (*linux_nat_new_thread) (ptid_t); | |
201 | ||
5b009018 PA |
202 | /* The method to call, if any, when the siginfo object needs to be |
203 | converted between the layout returned by ptrace, and the layout in | |
204 | the architecture of the inferior. */ | |
205 | static int (*linux_nat_siginfo_fixup) (struct siginfo *, | |
206 | gdb_byte *, | |
207 | int); | |
208 | ||
ac264b3b MS |
209 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
210 | Called by our to_xfer_partial. */ | |
211 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
212 | enum target_object, | |
213 | const char *, gdb_byte *, | |
214 | const gdb_byte *, | |
10d6c8cd DJ |
215 | ULONGEST, LONGEST); |
216 | ||
d6b0e80f | 217 | static int debug_linux_nat; |
920d2a44 AC |
218 | static void |
219 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
220 | struct cmd_list_element *c, const char *value) | |
221 | { | |
222 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
223 | value); | |
224 | } | |
d6b0e80f | 225 | |
b84876c2 PA |
226 | static int debug_linux_nat_async = 0; |
227 | static void | |
228 | show_debug_linux_nat_async (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 async lwp module is %s.\n"), | |
232 | value); | |
233 | } | |
234 | ||
10568435 JK |
235 | static int disable_randomization = 1; |
236 | ||
237 | static void | |
238 | show_disable_randomization (struct ui_file *file, int from_tty, | |
239 | struct cmd_list_element *c, const char *value) | |
240 | { | |
241 | #ifdef HAVE_PERSONALITY | |
242 | fprintf_filtered (file, _("\ | |
243 | Disabling randomization of debuggee's virtual address space is %s.\n"), | |
244 | value); | |
245 | #else /* !HAVE_PERSONALITY */ | |
246 | fputs_filtered (_("\ | |
247 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
248 | this platform.\n"), file); | |
249 | #endif /* !HAVE_PERSONALITY */ | |
250 | } | |
251 | ||
252 | static void | |
253 | set_disable_randomization (char *args, int from_tty, struct cmd_list_element *c) | |
254 | { | |
255 | #ifndef HAVE_PERSONALITY | |
256 | error (_("\ | |
257 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
258 | this platform.")); | |
259 | #endif /* !HAVE_PERSONALITY */ | |
260 | } | |
261 | ||
9016a515 DJ |
262 | static int linux_parent_pid; |
263 | ||
ae087d01 DJ |
264 | struct simple_pid_list |
265 | { | |
266 | int pid; | |
3d799a95 | 267 | int status; |
ae087d01 DJ |
268 | struct simple_pid_list *next; |
269 | }; | |
270 | struct simple_pid_list *stopped_pids; | |
271 | ||
3993f6b1 DJ |
272 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
273 | can not be used, 1 if it can. */ | |
274 | ||
275 | static int linux_supports_tracefork_flag = -1; | |
276 | ||
9016a515 DJ |
277 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
278 | PTRACE_O_TRACEVFORKDONE. */ | |
279 | ||
280 | static int linux_supports_tracevforkdone_flag = -1; | |
281 | ||
b84876c2 PA |
282 | /* Async mode support */ |
283 | ||
b84876c2 PA |
284 | /* Zero if the async mode, although enabled, is masked, which means |
285 | linux_nat_wait should behave as if async mode was off. */ | |
286 | static int linux_nat_async_mask_value = 1; | |
287 | ||
288 | /* The read/write ends of the pipe registered as waitable file in the | |
289 | event loop. */ | |
290 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
291 | ||
7feb7d06 | 292 | /* Flush the event pipe. */ |
b84876c2 | 293 | |
7feb7d06 PA |
294 | static void |
295 | async_file_flush (void) | |
b84876c2 | 296 | { |
7feb7d06 PA |
297 | int ret; |
298 | char buf; | |
b84876c2 | 299 | |
7feb7d06 | 300 | do |
b84876c2 | 301 | { |
7feb7d06 | 302 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 303 | } |
7feb7d06 | 304 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
305 | } |
306 | ||
7feb7d06 PA |
307 | /* Put something (anything, doesn't matter what, or how much) in event |
308 | pipe, so that the select/poll in the event-loop realizes we have | |
309 | something to process. */ | |
252fbfc8 | 310 | |
b84876c2 | 311 | static void |
7feb7d06 | 312 | async_file_mark (void) |
b84876c2 | 313 | { |
7feb7d06 | 314 | int ret; |
b84876c2 | 315 | |
7feb7d06 PA |
316 | /* It doesn't really matter what the pipe contains, as long we end |
317 | up with something in it. Might as well flush the previous | |
318 | left-overs. */ | |
319 | async_file_flush (); | |
b84876c2 | 320 | |
7feb7d06 | 321 | do |
b84876c2 | 322 | { |
7feb7d06 | 323 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 324 | } |
7feb7d06 | 325 | while (ret == -1 && errno == EINTR); |
b84876c2 | 326 | |
7feb7d06 PA |
327 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
328 | be awakened anyway. */ | |
b84876c2 PA |
329 | } |
330 | ||
7feb7d06 PA |
331 | static void linux_nat_async (void (*callback) |
332 | (enum inferior_event_type event_type, void *context), | |
333 | void *context); | |
334 | static int linux_nat_async_mask (int mask); | |
335 | static int kill_lwp (int lwpid, int signo); | |
336 | ||
337 | static int stop_callback (struct lwp_info *lp, void *data); | |
338 | ||
339 | static void block_child_signals (sigset_t *prev_mask); | |
340 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
ae087d01 DJ |
341 | \f |
342 | /* Trivial list manipulation functions to keep track of a list of | |
343 | new stopped processes. */ | |
344 | static void | |
3d799a95 | 345 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
346 | { |
347 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
348 | new_pid->pid = pid; | |
3d799a95 | 349 | new_pid->status = status; |
ae087d01 DJ |
350 | new_pid->next = *listp; |
351 | *listp = new_pid; | |
352 | } | |
353 | ||
354 | static int | |
3d799a95 | 355 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *status) |
ae087d01 DJ |
356 | { |
357 | struct simple_pid_list **p; | |
358 | ||
359 | for (p = listp; *p != NULL; p = &(*p)->next) | |
360 | if ((*p)->pid == pid) | |
361 | { | |
362 | struct simple_pid_list *next = (*p)->next; | |
3d799a95 | 363 | *status = (*p)->status; |
ae087d01 DJ |
364 | xfree (*p); |
365 | *p = next; | |
366 | return 1; | |
367 | } | |
368 | return 0; | |
369 | } | |
370 | ||
3d799a95 DJ |
371 | static void |
372 | linux_record_stopped_pid (int pid, int status) | |
ae087d01 | 373 | { |
3d799a95 | 374 | add_to_pid_list (&stopped_pids, pid, status); |
ae087d01 DJ |
375 | } |
376 | ||
3993f6b1 DJ |
377 | \f |
378 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
379 | ||
380 | static void | |
381 | linux_tracefork_child (void) | |
382 | { | |
383 | int ret; | |
384 | ||
385 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
386 | kill (getpid (), SIGSTOP); | |
387 | fork (); | |
48bb3cce | 388 | _exit (0); |
3993f6b1 DJ |
389 | } |
390 | ||
7feb7d06 | 391 | /* Wrapper function for waitpid which handles EINTR. */ |
b957e937 DJ |
392 | |
393 | static int | |
394 | my_waitpid (int pid, int *status, int flags) | |
395 | { | |
396 | int ret; | |
b84876c2 | 397 | |
b957e937 DJ |
398 | do |
399 | { | |
400 | ret = waitpid (pid, status, flags); | |
401 | } | |
402 | while (ret == -1 && errno == EINTR); | |
403 | ||
404 | return ret; | |
405 | } | |
406 | ||
407 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
408 | ||
409 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
410 | we know that the feature is not available. This may change the tracing | |
411 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
412 | ||
413 | However, if it succeeds, we don't know for sure that the feature is | |
414 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 415 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
416 | fork tracing, and let it fork. If the process exits, we assume that we |
417 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
418 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
419 | |
420 | static void | |
b957e937 | 421 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
422 | { |
423 | int child_pid, ret, status; | |
424 | long second_pid; | |
7feb7d06 | 425 | sigset_t prev_mask; |
4c28f408 | 426 | |
7feb7d06 PA |
427 | /* We don't want those ptrace calls to be interrupted. */ |
428 | block_child_signals (&prev_mask); | |
3993f6b1 | 429 | |
b957e937 DJ |
430 | linux_supports_tracefork_flag = 0; |
431 | linux_supports_tracevforkdone_flag = 0; | |
432 | ||
433 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
434 | if (ret != 0) | |
7feb7d06 PA |
435 | { |
436 | restore_child_signals_mask (&prev_mask); | |
437 | return; | |
438 | } | |
b957e937 | 439 | |
3993f6b1 DJ |
440 | child_pid = fork (); |
441 | if (child_pid == -1) | |
e2e0b3e5 | 442 | perror_with_name (("fork")); |
3993f6b1 DJ |
443 | |
444 | if (child_pid == 0) | |
445 | linux_tracefork_child (); | |
446 | ||
b957e937 | 447 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 448 | if (ret == -1) |
e2e0b3e5 | 449 | perror_with_name (("waitpid")); |
3993f6b1 | 450 | else if (ret != child_pid) |
8a3fe4f8 | 451 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 452 | if (! WIFSTOPPED (status)) |
8a3fe4f8 | 453 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status); |
3993f6b1 | 454 | |
3993f6b1 DJ |
455 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
456 | if (ret != 0) | |
457 | { | |
b957e937 DJ |
458 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
459 | if (ret != 0) | |
460 | { | |
8a3fe4f8 | 461 | warning (_("linux_test_for_tracefork: failed to kill child")); |
7feb7d06 | 462 | restore_child_signals_mask (&prev_mask); |
b957e937 DJ |
463 | return; |
464 | } | |
465 | ||
466 | ret = my_waitpid (child_pid, &status, 0); | |
467 | if (ret != child_pid) | |
8a3fe4f8 | 468 | warning (_("linux_test_for_tracefork: failed to wait for killed child")); |
b957e937 | 469 | else if (!WIFSIGNALED (status)) |
8a3fe4f8 AC |
470 | warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from " |
471 | "killed child"), status); | |
b957e937 | 472 | |
7feb7d06 | 473 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
474 | return; |
475 | } | |
476 | ||
9016a515 DJ |
477 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
478 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
479 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
480 | linux_supports_tracevforkdone_flag = (ret == 0); | |
481 | ||
b957e937 DJ |
482 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
483 | if (ret != 0) | |
8a3fe4f8 | 484 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
485 | |
486 | ret = my_waitpid (child_pid, &status, 0); | |
487 | ||
3993f6b1 DJ |
488 | if (ret == child_pid && WIFSTOPPED (status) |
489 | && status >> 16 == PTRACE_EVENT_FORK) | |
490 | { | |
491 | second_pid = 0; | |
492 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
493 | if (ret == 0 && second_pid != 0) | |
494 | { | |
495 | int second_status; | |
496 | ||
497 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
498 | my_waitpid (second_pid, &second_status, 0); |
499 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
500 | if (ret != 0) | |
8a3fe4f8 | 501 | warning (_("linux_test_for_tracefork: failed to kill second child")); |
97725dc4 | 502 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
503 | } |
504 | } | |
b957e937 | 505 | else |
8a3fe4f8 AC |
506 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
507 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 508 | |
b957e937 DJ |
509 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
510 | if (ret != 0) | |
8a3fe4f8 | 511 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 512 | my_waitpid (child_pid, &status, 0); |
4c28f408 | 513 | |
7feb7d06 | 514 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
515 | } |
516 | ||
517 | /* Return non-zero iff we have tracefork functionality available. | |
518 | This function also sets linux_supports_tracefork_flag. */ | |
519 | ||
520 | static int | |
b957e937 | 521 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
522 | { |
523 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 524 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
525 | return linux_supports_tracefork_flag; |
526 | } | |
527 | ||
9016a515 | 528 | static int |
b957e937 | 529 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
530 | { |
531 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 532 | linux_test_for_tracefork (pid); |
9016a515 DJ |
533 | return linux_supports_tracevforkdone_flag; |
534 | } | |
535 | ||
3993f6b1 | 536 | \f |
4de4c07c DJ |
537 | void |
538 | linux_enable_event_reporting (ptid_t ptid) | |
539 | { | |
d3587048 | 540 | int pid = ptid_get_lwp (ptid); |
4de4c07c DJ |
541 | int options; |
542 | ||
d3587048 DJ |
543 | if (pid == 0) |
544 | pid = ptid_get_pid (ptid); | |
545 | ||
b957e937 | 546 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
547 | return; |
548 | ||
a2f23071 DJ |
549 | options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC |
550 | | PTRACE_O_TRACECLONE; | |
b957e937 | 551 | if (linux_supports_tracevforkdone (pid)) |
9016a515 DJ |
552 | options |= PTRACE_O_TRACEVFORKDONE; |
553 | ||
554 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
555 | read-only process state. */ | |
4de4c07c DJ |
556 | |
557 | ptrace (PTRACE_SETOPTIONS, pid, 0, options); | |
558 | } | |
559 | ||
6d8fd2b7 UW |
560 | static void |
561 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
562 | { |
563 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
0ec9a092 | 564 | check_for_thread_db (); |
4de4c07c DJ |
565 | } |
566 | ||
10d6c8cd | 567 | static void |
4de4c07c DJ |
568 | linux_child_post_startup_inferior (ptid_t ptid) |
569 | { | |
570 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 571 | check_for_thread_db (); |
4de4c07c DJ |
572 | } |
573 | ||
6d8fd2b7 UW |
574 | static int |
575 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 576 | { |
7feb7d06 | 577 | sigset_t prev_mask; |
4de4c07c DJ |
578 | ptid_t last_ptid; |
579 | struct target_waitstatus last_status; | |
9016a515 | 580 | int has_vforked; |
4de4c07c DJ |
581 | int parent_pid, child_pid; |
582 | ||
7feb7d06 | 583 | block_child_signals (&prev_mask); |
b84876c2 | 584 | |
4de4c07c | 585 | get_last_target_status (&last_ptid, &last_status); |
9016a515 | 586 | has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); |
d3587048 DJ |
587 | parent_pid = ptid_get_lwp (last_ptid); |
588 | if (parent_pid == 0) | |
589 | parent_pid = ptid_get_pid (last_ptid); | |
3a3e9ee3 | 590 | child_pid = PIDGET (last_status.value.related_pid); |
4de4c07c DJ |
591 | |
592 | if (! follow_child) | |
593 | { | |
594 | /* We're already attached to the parent, by default. */ | |
595 | ||
596 | /* Before detaching from the child, remove all breakpoints from | |
b242c3c2 PA |
597 | it. If we forked, then this has already been taken care of |
598 | by infrun.c. If we vforked however, any breakpoint inserted | |
599 | in the parent is visible in the child, even those added while | |
600 | stopped in a vfork catchpoint. This won't actually modify | |
601 | the breakpoint list, but will physically remove the | |
602 | breakpoints from the child. This will remove the breakpoints | |
603 | from the parent also, but they'll be reinserted below. */ | |
604 | if (has_vforked) | |
605 | detach_breakpoints (child_pid); | |
4de4c07c | 606 | |
ac264b3b MS |
607 | /* Detach new forked process? */ |
608 | if (detach_fork) | |
f75c00e4 | 609 | { |
e85a822c | 610 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
611 | { |
612 | target_terminal_ours (); | |
613 | fprintf_filtered (gdb_stdlog, | |
614 | "Detaching after fork from child process %d.\n", | |
615 | child_pid); | |
616 | } | |
4de4c07c | 617 | |
ac264b3b MS |
618 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
619 | } | |
620 | else | |
621 | { | |
622 | struct fork_info *fp; | |
77435e4c | 623 | struct inferior *parent_inf, *child_inf; |
7f9f62ba PA |
624 | |
625 | /* Add process to GDB's tables. */ | |
77435e4c PA |
626 | child_inf = add_inferior (child_pid); |
627 | ||
628 | parent_inf = find_inferior_pid (GET_PID (last_ptid)); | |
629 | child_inf->attach_flag = parent_inf->attach_flag; | |
191c4426 | 630 | copy_terminal_info (child_inf, parent_inf); |
7f9f62ba | 631 | |
ac264b3b MS |
632 | /* Retain child fork in ptrace (stopped) state. */ |
633 | fp = find_fork_pid (child_pid); | |
634 | if (!fp) | |
635 | fp = add_fork (child_pid); | |
636 | fork_save_infrun_state (fp, 0); | |
637 | } | |
9016a515 DJ |
638 | |
639 | if (has_vforked) | |
640 | { | |
b957e937 DJ |
641 | gdb_assert (linux_supports_tracefork_flag >= 0); |
642 | if (linux_supports_tracevforkdone (0)) | |
9016a515 DJ |
643 | { |
644 | int status; | |
645 | ||
646 | ptrace (PTRACE_CONT, parent_pid, 0, 0); | |
58aecb61 | 647 | my_waitpid (parent_pid, &status, __WALL); |
c874c7fc | 648 | if ((status >> 16) != PTRACE_EVENT_VFORK_DONE) |
8a3fe4f8 AC |
649 | warning (_("Unexpected waitpid result %06x when waiting for " |
650 | "vfork-done"), status); | |
9016a515 DJ |
651 | } |
652 | else | |
653 | { | |
654 | /* We can't insert breakpoints until the child has | |
655 | finished with the shared memory region. We need to | |
656 | wait until that happens. Ideal would be to just | |
657 | call: | |
658 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
659 | - waitpid (parent_pid, &status, __WALL); | |
660 | However, most architectures can't handle a syscall | |
661 | being traced on the way out if it wasn't traced on | |
662 | the way in. | |
663 | ||
664 | We might also think to loop, continuing the child | |
665 | until it exits or gets a SIGTRAP. One problem is | |
666 | that the child might call ptrace with PTRACE_TRACEME. | |
667 | ||
668 | There's no simple and reliable way to figure out when | |
669 | the vforked child will be done with its copy of the | |
670 | shared memory. We could step it out of the syscall, | |
671 | two instructions, let it go, and then single-step the | |
672 | parent once. When we have hardware single-step, this | |
673 | would work; with software single-step it could still | |
674 | be made to work but we'd have to be able to insert | |
675 | single-step breakpoints in the child, and we'd have | |
676 | to insert -just- the single-step breakpoint in the | |
677 | parent. Very awkward. | |
678 | ||
679 | In the end, the best we can do is to make sure it | |
680 | runs for a little while. Hopefully it will be out of | |
681 | range of any breakpoints we reinsert. Usually this | |
682 | is only the single-step breakpoint at vfork's return | |
683 | point. */ | |
684 | ||
685 | usleep (10000); | |
686 | } | |
687 | ||
688 | /* Since we vforked, breakpoints were removed in the parent | |
689 | too. Put them back. */ | |
690 | reattach_breakpoints (parent_pid); | |
691 | } | |
4de4c07c | 692 | } |
3993f6b1 | 693 | else |
4de4c07c | 694 | { |
4e1c45ea PA |
695 | struct thread_info *last_tp = find_thread_pid (last_ptid); |
696 | struct thread_info *tp; | |
4de4c07c | 697 | char child_pid_spelling[40]; |
77435e4c | 698 | struct inferior *parent_inf, *child_inf; |
4de4c07c | 699 | |
4e1c45ea PA |
700 | /* Copy user stepping state to the new inferior thread. */ |
701 | struct breakpoint *step_resume_breakpoint = last_tp->step_resume_breakpoint; | |
702 | CORE_ADDR step_range_start = last_tp->step_range_start; | |
703 | CORE_ADDR step_range_end = last_tp->step_range_end; | |
704 | struct frame_id step_frame_id = last_tp->step_frame_id; | |
705 | ||
706 | /* Otherwise, deleting the parent would get rid of this | |
707 | breakpoint. */ | |
708 | last_tp->step_resume_breakpoint = NULL; | |
709 | ||
4de4c07c DJ |
710 | /* Before detaching from the parent, remove all breakpoints from it. */ |
711 | remove_breakpoints (); | |
712 | ||
e85a822c | 713 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
714 | { |
715 | target_terminal_ours (); | |
ac264b3b MS |
716 | fprintf_filtered (gdb_stdlog, |
717 | "Attaching after fork to child process %d.\n", | |
718 | child_pid); | |
f75c00e4 | 719 | } |
4de4c07c | 720 | |
7a7d3353 PA |
721 | /* Add the new inferior first, so that the target_detach below |
722 | doesn't unpush the target. */ | |
723 | ||
77435e4c PA |
724 | child_inf = add_inferior (child_pid); |
725 | ||
726 | parent_inf = find_inferior_pid (GET_PID (last_ptid)); | |
727 | child_inf->attach_flag = parent_inf->attach_flag; | |
191c4426 | 728 | copy_terminal_info (child_inf, parent_inf); |
7a7d3353 | 729 | |
9016a515 DJ |
730 | /* If we're vforking, we may want to hold on to the parent until |
731 | the child exits or execs. At exec time we can remove the old | |
732 | breakpoints from the parent and detach it; at exit time we | |
733 | could do the same (or even, sneakily, resume debugging it - the | |
734 | child's exec has failed, or something similar). | |
735 | ||
736 | This doesn't clean up "properly", because we can't call | |
737 | target_detach, but that's OK; if the current target is "child", | |
738 | then it doesn't need any further cleanups, and lin_lwp will | |
739 | generally not encounter vfork (vfork is defined to fork | |
740 | in libpthread.so). | |
741 | ||
742 | The holding part is very easy if we have VFORKDONE events; | |
743 | but keeping track of both processes is beyond GDB at the | |
744 | moment. So we don't expose the parent to the rest of GDB. | |
745 | Instead we quietly hold onto it until such time as we can | |
746 | safely resume it. */ | |
747 | ||
748 | if (has_vforked) | |
7f9f62ba PA |
749 | { |
750 | linux_parent_pid = parent_pid; | |
751 | detach_inferior (parent_pid); | |
752 | } | |
ac264b3b MS |
753 | else if (!detach_fork) |
754 | { | |
755 | struct fork_info *fp; | |
756 | /* Retain parent fork in ptrace (stopped) state. */ | |
757 | fp = find_fork_pid (parent_pid); | |
758 | if (!fp) | |
759 | fp = add_fork (parent_pid); | |
760 | fork_save_infrun_state (fp, 0); | |
0d14fc63 PA |
761 | |
762 | /* Also add an entry for the child fork. */ | |
763 | fp = find_fork_pid (child_pid); | |
764 | if (!fp) | |
765 | fp = add_fork (child_pid); | |
766 | fork_save_infrun_state (fp, 0); | |
ac264b3b | 767 | } |
9016a515 | 768 | else |
b84876c2 | 769 | target_detach (NULL, 0); |
4de4c07c | 770 | |
9f0bdab8 | 771 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
ac264b3b | 772 | |
9f0bdab8 | 773 | linux_nat_switch_fork (inferior_ptid); |
ef29ce1a | 774 | check_for_thread_db (); |
4de4c07c | 775 | |
4e1c45ea PA |
776 | tp = inferior_thread (); |
777 | tp->step_resume_breakpoint = step_resume_breakpoint; | |
778 | tp->step_range_start = step_range_start; | |
779 | tp->step_range_end = step_range_end; | |
780 | tp->step_frame_id = step_frame_id; | |
781 | ||
4de4c07c DJ |
782 | /* Reset breakpoints in the child as appropriate. */ |
783 | follow_inferior_reset_breakpoints (); | |
784 | } | |
785 | ||
7feb7d06 | 786 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
787 | return 0; |
788 | } | |
789 | ||
4de4c07c | 790 | \f |
6d8fd2b7 UW |
791 | static void |
792 | linux_child_insert_fork_catchpoint (int pid) | |
4de4c07c | 793 | { |
b957e937 | 794 | if (! linux_supports_tracefork (pid)) |
8a3fe4f8 | 795 | error (_("Your system does not support fork catchpoints.")); |
3993f6b1 DJ |
796 | } |
797 | ||
6d8fd2b7 UW |
798 | static void |
799 | linux_child_insert_vfork_catchpoint (int pid) | |
3993f6b1 | 800 | { |
b957e937 | 801 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 802 | error (_("Your system does not support vfork catchpoints.")); |
3993f6b1 DJ |
803 | } |
804 | ||
6d8fd2b7 UW |
805 | static void |
806 | linux_child_insert_exec_catchpoint (int pid) | |
3993f6b1 | 807 | { |
b957e937 | 808 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 809 | error (_("Your system does not support exec catchpoints.")); |
3993f6b1 DJ |
810 | } |
811 | ||
d6b0e80f AC |
812 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
813 | are processes sharing the same VM space. A multi-threaded process | |
814 | is basically a group of such processes. However, such a grouping | |
815 | is almost entirely a user-space issue; the kernel doesn't enforce | |
816 | such a grouping at all (this might change in the future). In | |
817 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
818 | Threads library) to provide such a grouping. | |
819 | ||
820 | It is perfectly well possible to write a multi-threaded application | |
821 | without the assistance of a threads library, by using the clone | |
822 | system call directly. This module should be able to give some | |
823 | rudimentary support for debugging such applications if developers | |
824 | specify the CLONE_PTRACE flag in the clone system call, and are | |
825 | using the Linux kernel 2.4 or above. | |
826 | ||
827 | Note that there are some peculiarities in GNU/Linux that affect | |
828 | this code: | |
829 | ||
830 | - In general one should specify the __WCLONE flag to waitpid in | |
831 | order to make it report events for any of the cloned processes | |
832 | (and leave it out for the initial process). However, if a cloned | |
833 | process has exited the exit status is only reported if the | |
834 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
835 | we cannot use it since GDB must work on older systems too. | |
836 | ||
837 | - When a traced, cloned process exits and is waited for by the | |
838 | debugger, the kernel reassigns it to the original parent and | |
839 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
840 | library doesn't notice this, which leads to the "zombie problem": | |
841 | When debugged a multi-threaded process that spawns a lot of | |
842 | threads will run out of processes, even if the threads exit, | |
843 | because the "zombies" stay around. */ | |
844 | ||
845 | /* List of known LWPs. */ | |
9f0bdab8 | 846 | struct lwp_info *lwp_list; |
d6b0e80f AC |
847 | \f |
848 | ||
d6b0e80f AC |
849 | /* Original signal mask. */ |
850 | static sigset_t normal_mask; | |
851 | ||
852 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
853 | _initialize_linux_nat. */ | |
854 | static sigset_t suspend_mask; | |
855 | ||
7feb7d06 PA |
856 | /* Signals to block to make that sigsuspend work. */ |
857 | static sigset_t blocked_mask; | |
858 | ||
859 | /* SIGCHLD action. */ | |
860 | struct sigaction sigchld_action; | |
b84876c2 | 861 | |
7feb7d06 PA |
862 | /* Block child signals (SIGCHLD and linux threads signals), and store |
863 | the previous mask in PREV_MASK. */ | |
84e46146 | 864 | |
7feb7d06 PA |
865 | static void |
866 | block_child_signals (sigset_t *prev_mask) | |
867 | { | |
868 | /* Make sure SIGCHLD is blocked. */ | |
869 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
870 | sigaddset (&blocked_mask, SIGCHLD); | |
871 | ||
872 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
873 | } | |
874 | ||
875 | /* Restore child signals mask, previously returned by | |
876 | block_child_signals. */ | |
877 | ||
878 | static void | |
879 | restore_child_signals_mask (sigset_t *prev_mask) | |
880 | { | |
881 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
882 | } | |
d6b0e80f AC |
883 | \f |
884 | ||
885 | /* Prototypes for local functions. */ | |
886 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 887 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 888 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd PA |
889 | static int cancel_breakpoint (struct lwp_info *lp); |
890 | ||
d6b0e80f AC |
891 | \f |
892 | /* Convert wait status STATUS to a string. Used for printing debug | |
893 | messages only. */ | |
894 | ||
895 | static char * | |
896 | status_to_str (int status) | |
897 | { | |
898 | static char buf[64]; | |
899 | ||
900 | if (WIFSTOPPED (status)) | |
901 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
902 | strsignal (WSTOPSIG (status))); | |
903 | else if (WIFSIGNALED (status)) | |
904 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
905 | strsignal (WSTOPSIG (status))); | |
906 | else | |
907 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
908 | ||
909 | return buf; | |
910 | } | |
911 | ||
912 | /* Initialize the list of LWPs. Note that this module, contrary to | |
913 | what GDB's generic threads layer does for its thread list, | |
914 | re-initializes the LWP lists whenever we mourn or detach (which | |
915 | doesn't involve mourning) the inferior. */ | |
916 | ||
917 | static void | |
918 | init_lwp_list (void) | |
919 | { | |
920 | struct lwp_info *lp, *lpnext; | |
921 | ||
922 | for (lp = lwp_list; lp; lp = lpnext) | |
923 | { | |
924 | lpnext = lp->next; | |
925 | xfree (lp); | |
926 | } | |
927 | ||
928 | lwp_list = NULL; | |
d90e17a7 PA |
929 | } |
930 | ||
931 | /* Remove all LWPs belong to PID from the lwp list. */ | |
932 | ||
933 | static void | |
934 | purge_lwp_list (int pid) | |
935 | { | |
936 | struct lwp_info *lp, *lpprev, *lpnext; | |
937 | ||
938 | lpprev = NULL; | |
939 | ||
940 | for (lp = lwp_list; lp; lp = lpnext) | |
941 | { | |
942 | lpnext = lp->next; | |
943 | ||
944 | if (ptid_get_pid (lp->ptid) == pid) | |
945 | { | |
946 | if (lp == lwp_list) | |
947 | lwp_list = lp->next; | |
948 | else | |
949 | lpprev->next = lp->next; | |
950 | ||
951 | xfree (lp); | |
952 | } | |
953 | else | |
954 | lpprev = lp; | |
955 | } | |
956 | } | |
957 | ||
958 | /* Return the number of known LWPs in the tgid given by PID. */ | |
959 | ||
960 | static int | |
961 | num_lwps (int pid) | |
962 | { | |
963 | int count = 0; | |
964 | struct lwp_info *lp; | |
965 | ||
966 | for (lp = lwp_list; lp; lp = lp->next) | |
967 | if (ptid_get_pid (lp->ptid) == pid) | |
968 | count++; | |
969 | ||
970 | return count; | |
d6b0e80f AC |
971 | } |
972 | ||
f973ed9c | 973 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
974 | structure describing the new LWP. The LWP should already be stopped |
975 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
976 | |
977 | static struct lwp_info * | |
978 | add_lwp (ptid_t ptid) | |
979 | { | |
980 | struct lwp_info *lp; | |
981 | ||
982 | gdb_assert (is_lwp (ptid)); | |
983 | ||
984 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
985 | ||
986 | memset (lp, 0, sizeof (struct lwp_info)); | |
987 | ||
988 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
989 | ||
990 | lp->ptid = ptid; | |
991 | ||
992 | lp->next = lwp_list; | |
993 | lwp_list = lp; | |
d6b0e80f | 994 | |
d90e17a7 | 995 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
996 | linux_nat_new_thread (ptid); |
997 | ||
d6b0e80f AC |
998 | return lp; |
999 | } | |
1000 | ||
1001 | /* Remove the LWP specified by PID from the list. */ | |
1002 | ||
1003 | static void | |
1004 | delete_lwp (ptid_t ptid) | |
1005 | { | |
1006 | struct lwp_info *lp, *lpprev; | |
1007 | ||
1008 | lpprev = NULL; | |
1009 | ||
1010 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1011 | if (ptid_equal (lp->ptid, ptid)) | |
1012 | break; | |
1013 | ||
1014 | if (!lp) | |
1015 | return; | |
1016 | ||
d6b0e80f AC |
1017 | if (lpprev) |
1018 | lpprev->next = lp->next; | |
1019 | else | |
1020 | lwp_list = lp->next; | |
1021 | ||
1022 | xfree (lp); | |
1023 | } | |
1024 | ||
1025 | /* Return a pointer to the structure describing the LWP corresponding | |
1026 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1027 | ||
1028 | static struct lwp_info * | |
1029 | find_lwp_pid (ptid_t ptid) | |
1030 | { | |
1031 | struct lwp_info *lp; | |
1032 | int lwp; | |
1033 | ||
1034 | if (is_lwp (ptid)) | |
1035 | lwp = GET_LWP (ptid); | |
1036 | else | |
1037 | lwp = GET_PID (ptid); | |
1038 | ||
1039 | for (lp = lwp_list; lp; lp = lp->next) | |
1040 | if (lwp == GET_LWP (lp->ptid)) | |
1041 | return lp; | |
1042 | ||
1043 | return NULL; | |
1044 | } | |
1045 | ||
d90e17a7 PA |
1046 | /* Returns true if PTID matches filter FILTER. FILTER can be the wild |
1047 | card MINUS_ONE_PTID (all ptid match it); can be a ptid representing | |
1048 | a process (ptid_is_pid returns true), in which case, all lwps of | |
1049 | that give process match, lwps of other process do not; or, it can | |
1050 | represent a specific thread, in which case, only that thread will | |
1051 | match true. PTID must represent an LWP, it can never be a wild | |
1052 | card. */ | |
1053 | ||
1054 | static int | |
1055 | ptid_match (ptid_t ptid, ptid_t filter) | |
1056 | { | |
1057 | /* Since both parameters have the same type, prevent easy mistakes | |
1058 | from happening. */ | |
1059 | gdb_assert (!ptid_equal (ptid, minus_one_ptid) | |
1060 | && !ptid_equal (ptid, null_ptid)); | |
1061 | ||
1062 | if (ptid_equal (filter, minus_one_ptid)) | |
1063 | return 1; | |
1064 | if (ptid_is_pid (filter) | |
1065 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
1066 | return 1; | |
1067 | else if (ptid_equal (ptid, filter)) | |
1068 | return 1; | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | ||
d6b0e80f AC |
1073 | /* Call CALLBACK with its second argument set to DATA for every LWP in |
1074 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1075 | pointer to the structure describing that LWP immediately. | |
1076 | Otherwise return NULL. */ | |
1077 | ||
1078 | struct lwp_info * | |
d90e17a7 PA |
1079 | iterate_over_lwps (ptid_t filter, |
1080 | int (*callback) (struct lwp_info *, void *), | |
1081 | void *data) | |
d6b0e80f AC |
1082 | { |
1083 | struct lwp_info *lp, *lpnext; | |
1084 | ||
1085 | for (lp = lwp_list; lp; lp = lpnext) | |
1086 | { | |
1087 | lpnext = lp->next; | |
d90e17a7 PA |
1088 | |
1089 | if (ptid_match (lp->ptid, filter)) | |
1090 | { | |
1091 | if ((*callback) (lp, data)) | |
1092 | return lp; | |
1093 | } | |
d6b0e80f AC |
1094 | } |
1095 | ||
1096 | return NULL; | |
1097 | } | |
1098 | ||
f973ed9c DJ |
1099 | /* Update our internal state when changing from one fork (checkpoint, |
1100 | et cetera) to another indicated by NEW_PTID. We can only switch | |
1101 | single-threaded applications, so we only create one new LWP, and | |
1102 | the previous list is discarded. */ | |
1103 | ||
1104 | void | |
1105 | linux_nat_switch_fork (ptid_t new_ptid) | |
1106 | { | |
1107 | struct lwp_info *lp; | |
1108 | ||
1109 | init_lwp_list (); | |
1110 | lp = add_lwp (new_ptid); | |
1111 | lp->stopped = 1; | |
e26af52f | 1112 | |
4f8d22e3 PA |
1113 | init_thread_list (); |
1114 | add_thread_silent (new_ptid); | |
e26af52f DJ |
1115 | } |
1116 | ||
e26af52f DJ |
1117 | /* Handle the exit of a single thread LP. */ |
1118 | ||
1119 | static void | |
1120 | exit_lwp (struct lwp_info *lp) | |
1121 | { | |
063bfe2e VP |
1122 | struct thread_info *th = find_thread_pid (lp->ptid); |
1123 | ||
1124 | if (th) | |
e26af52f | 1125 | { |
17faa917 DJ |
1126 | if (print_thread_events) |
1127 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1128 | ||
4f8d22e3 | 1129 | delete_thread (lp->ptid); |
e26af52f DJ |
1130 | } |
1131 | ||
1132 | delete_lwp (lp->ptid); | |
1133 | } | |
1134 | ||
4d062f1a PA |
1135 | /* Return an lwp's tgid, found in `/proc/PID/status'. */ |
1136 | ||
1137 | int | |
1138 | linux_proc_get_tgid (int lwpid) | |
1139 | { | |
1140 | FILE *status_file; | |
1141 | char buf[100]; | |
1142 | int tgid = -1; | |
1143 | ||
1144 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); | |
1145 | status_file = fopen (buf, "r"); | |
1146 | if (status_file != NULL) | |
1147 | { | |
1148 | while (fgets (buf, sizeof (buf), status_file)) | |
1149 | { | |
1150 | if (strncmp (buf, "Tgid:", 5) == 0) | |
1151 | { | |
1152 | tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10); | |
1153 | break; | |
1154 | } | |
1155 | } | |
1156 | ||
1157 | fclose (status_file); | |
1158 | } | |
1159 | ||
1160 | return tgid; | |
1161 | } | |
1162 | ||
a0ef4274 DJ |
1163 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1164 | Other states including `T (tracing stop)' are reported as false. */ | |
1165 | ||
1166 | static int | |
1167 | pid_is_stopped (pid_t pid) | |
1168 | { | |
1169 | FILE *status_file; | |
1170 | char buf[100]; | |
1171 | int retval = 0; | |
1172 | ||
1173 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1174 | status_file = fopen (buf, "r"); | |
1175 | if (status_file != NULL) | |
1176 | { | |
1177 | int have_state = 0; | |
1178 | ||
1179 | while (fgets (buf, sizeof (buf), status_file)) | |
1180 | { | |
1181 | if (strncmp (buf, "State:", 6) == 0) | |
1182 | { | |
1183 | have_state = 1; | |
1184 | break; | |
1185 | } | |
1186 | } | |
1187 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1188 | retval = 1; | |
1189 | fclose (status_file); | |
1190 | } | |
1191 | return retval; | |
1192 | } | |
1193 | ||
1194 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1195 | Returns a wait status for that LWP, to cache. */ | |
1196 | ||
1197 | static int | |
1198 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1199 | int *signalled) | |
1200 | { | |
1201 | pid_t new_pid, pid = GET_LWP (ptid); | |
1202 | int status; | |
1203 | ||
1204 | if (pid_is_stopped (pid)) | |
1205 | { | |
1206 | if (debug_linux_nat) | |
1207 | fprintf_unfiltered (gdb_stdlog, | |
1208 | "LNPAW: Attaching to a stopped process\n"); | |
1209 | ||
1210 | /* The process is definitely stopped. It is in a job control | |
1211 | stop, unless the kernel predates the TASK_STOPPED / | |
1212 | TASK_TRACED distinction, in which case it might be in a | |
1213 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1214 | can kill it, signal it, et cetera. | |
1215 | ||
1216 | First make sure there is a pending SIGSTOP. Since we are | |
1217 | already attached, the process can not transition from stopped | |
1218 | to running without a PTRACE_CONT; so we know this signal will | |
1219 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1220 | probably already in the queue (unless this kernel is old | |
1221 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1222 | is not an RT signal, it can only be queued once. */ | |
1223 | kill_lwp (pid, SIGSTOP); | |
1224 | ||
1225 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1226 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1227 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1228 | } | |
1229 | ||
1230 | /* Make sure the initial process is stopped. The user-level threads | |
1231 | layer might want to poke around in the inferior, and that won't | |
1232 | work if things haven't stabilized yet. */ | |
1233 | new_pid = my_waitpid (pid, &status, 0); | |
1234 | if (new_pid == -1 && errno == ECHILD) | |
1235 | { | |
1236 | if (first) | |
1237 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1238 | ||
1239 | /* Try again with __WCLONE to check cloned processes. */ | |
1240 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1241 | *cloned = 1; | |
1242 | } | |
1243 | ||
1244 | gdb_assert (pid == new_pid && WIFSTOPPED (status)); | |
1245 | ||
1246 | if (WSTOPSIG (status) != SIGSTOP) | |
1247 | { | |
1248 | *signalled = 1; | |
1249 | if (debug_linux_nat) | |
1250 | fprintf_unfiltered (gdb_stdlog, | |
1251 | "LNPAW: Received %s after attaching\n", | |
1252 | status_to_str (status)); | |
1253 | } | |
1254 | ||
1255 | return status; | |
1256 | } | |
1257 | ||
1258 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1259 | if the new LWP could not be attached. */ | |
d6b0e80f | 1260 | |
9ee57c33 | 1261 | int |
93815fbf | 1262 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1263 | { |
9ee57c33 | 1264 | struct lwp_info *lp; |
7feb7d06 | 1265 | sigset_t prev_mask; |
d6b0e80f AC |
1266 | |
1267 | gdb_assert (is_lwp (ptid)); | |
1268 | ||
7feb7d06 | 1269 | block_child_signals (&prev_mask); |
d6b0e80f | 1270 | |
9ee57c33 | 1271 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1272 | |
1273 | /* We assume that we're already attached to any LWP that has an id | |
1274 | equal to the overall process id, and to any LWP that is already | |
1275 | in our list of LWPs. If we're not seeing exit events from threads | |
1276 | and we've had PID wraparound since we last tried to stop all threads, | |
1277 | this assumption might be wrong; fortunately, this is very unlikely | |
1278 | to happen. */ | |
9ee57c33 | 1279 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1280 | { |
a0ef4274 | 1281 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1282 | |
1283 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1284 | { |
1285 | /* If we fail to attach to the thread, issue a warning, | |
1286 | but continue. One way this can happen is if thread | |
e9efe249 | 1287 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1288 | bug may place threads in the thread list and then fail |
1289 | to create them. */ | |
1290 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1291 | safe_strerror (errno)); | |
7feb7d06 | 1292 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1293 | return -1; |
1294 | } | |
1295 | ||
d6b0e80f AC |
1296 | if (debug_linux_nat) |
1297 | fprintf_unfiltered (gdb_stdlog, | |
1298 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1299 | target_pid_to_str (ptid)); | |
1300 | ||
a0ef4274 DJ |
1301 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
1302 | lp = add_lwp (ptid); | |
1303 | lp->stopped = 1; | |
1304 | lp->cloned = cloned; | |
1305 | lp->signalled = signalled; | |
1306 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1307 | { |
a0ef4274 DJ |
1308 | lp->resumed = 1; |
1309 | lp->status = status; | |
d6b0e80f AC |
1310 | } |
1311 | ||
a0ef4274 | 1312 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1313 | |
1314 | if (debug_linux_nat) | |
1315 | { | |
1316 | fprintf_unfiltered (gdb_stdlog, | |
1317 | "LLAL: waitpid %s received %s\n", | |
1318 | target_pid_to_str (ptid), | |
1319 | status_to_str (status)); | |
1320 | } | |
1321 | } | |
1322 | else | |
1323 | { | |
1324 | /* We assume that the LWP representing the original process is | |
1325 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1326 | that the GNU/linux ptrace layer uses to keep track of |
1327 | threads. Note that this won't have already been done since | |
1328 | the main thread will have, we assume, been stopped by an | |
1329 | attach from a different layer. */ | |
9ee57c33 DJ |
1330 | if (lp == NULL) |
1331 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1332 | lp->stopped = 1; |
1333 | } | |
9ee57c33 | 1334 | |
7feb7d06 | 1335 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1336 | return 0; |
d6b0e80f AC |
1337 | } |
1338 | ||
b84876c2 | 1339 | static void |
136d6dae VP |
1340 | linux_nat_create_inferior (struct target_ops *ops, |
1341 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1342 | int from_tty) |
1343 | { | |
10568435 JK |
1344 | #ifdef HAVE_PERSONALITY |
1345 | int personality_orig = 0, personality_set = 0; | |
1346 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1347 | |
1348 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1349 | we have to mask the async mode. */ | |
1350 | ||
10568435 JK |
1351 | #ifdef HAVE_PERSONALITY |
1352 | if (disable_randomization) | |
1353 | { | |
1354 | errno = 0; | |
1355 | personality_orig = personality (0xffffffff); | |
1356 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1357 | { | |
1358 | personality_set = 1; | |
1359 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1360 | } | |
1361 | if (errno != 0 || (personality_set | |
1362 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1363 | warning (_("Error disabling address space randomization: %s"), | |
1364 | safe_strerror (errno)); | |
1365 | } | |
1366 | #endif /* HAVE_PERSONALITY */ | |
1367 | ||
136d6dae | 1368 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1369 | |
10568435 JK |
1370 | #ifdef HAVE_PERSONALITY |
1371 | if (personality_set) | |
1372 | { | |
1373 | errno = 0; | |
1374 | personality (personality_orig); | |
1375 | if (errno != 0) | |
1376 | warning (_("Error restoring address space randomization: %s"), | |
1377 | safe_strerror (errno)); | |
1378 | } | |
1379 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1380 | } |
1381 | ||
d6b0e80f | 1382 | static void |
136d6dae | 1383 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1384 | { |
1385 | struct lwp_info *lp; | |
d6b0e80f | 1386 | int status; |
af990527 | 1387 | ptid_t ptid; |
d6b0e80f | 1388 | |
136d6dae | 1389 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1390 | |
af990527 PA |
1391 | /* The ptrace base target adds the main thread with (pid,0,0) |
1392 | format. Decorate it with lwp info. */ | |
1393 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1394 | thread_change_ptid (inferior_ptid, ptid); | |
1395 | ||
9f0bdab8 | 1396 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1397 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1398 | |
1399 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1400 | &lp->signalled); | |
1401 | lp->stopped = 1; | |
9f0bdab8 | 1402 | |
a0ef4274 | 1403 | /* Save the wait status to report later. */ |
d6b0e80f | 1404 | lp->resumed = 1; |
a0ef4274 DJ |
1405 | if (debug_linux_nat) |
1406 | fprintf_unfiltered (gdb_stdlog, | |
1407 | "LNA: waitpid %ld, saving status %s\n", | |
1408 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1409 | |
7feb7d06 PA |
1410 | lp->status = status; |
1411 | ||
1412 | if (target_can_async_p ()) | |
1413 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1414 | } |
1415 | ||
a0ef4274 DJ |
1416 | /* Get pending status of LP. */ |
1417 | static int | |
1418 | get_pending_status (struct lwp_info *lp, int *status) | |
1419 | { | |
1420 | struct target_waitstatus last; | |
1421 | ptid_t last_ptid; | |
1422 | ||
1423 | get_last_target_status (&last_ptid, &last); | |
1424 | ||
1425 | /* If this lwp is the ptid that GDB is processing an event from, the | |
7feb7d06 PA |
1426 | signal will be in stop_signal. Otherwise, we may cache pending |
1427 | events in lp->status while trying to stop all threads (see | |
1428 | stop_wait_callback). */ | |
a0ef4274 DJ |
1429 | |
1430 | *status = 0; | |
4c28f408 PA |
1431 | |
1432 | if (non_stop) | |
a0ef4274 | 1433 | { |
4c28f408 PA |
1434 | enum target_signal signo = TARGET_SIGNAL_0; |
1435 | ||
1436 | if (is_executing (lp->ptid)) | |
1437 | { | |
1438 | /* If the core thought this lwp was executing --- e.g., the | |
1439 | executing property hasn't been updated yet, but the | |
1440 | thread has been stopped with a stop_callback / | |
1441 | stop_wait_callback sequence (see linux_nat_detach for | |
1442 | example) --- we can only have pending events in the local | |
1443 | queue. */ | |
7feb7d06 | 1444 | signo = target_signal_from_host (WSTOPSIG (lp->status)); |
4c28f408 PA |
1445 | } |
1446 | else | |
1447 | { | |
1448 | /* If the core knows the thread is not executing, then we | |
1449 | have the last signal recorded in | |
2020b7ab | 1450 | thread_info->stop_signal. */ |
4c28f408 | 1451 | |
2020b7ab PA |
1452 | struct thread_info *tp = find_thread_pid (lp->ptid); |
1453 | signo = tp->stop_signal; | |
4c28f408 PA |
1454 | } |
1455 | ||
1456 | if (signo != TARGET_SIGNAL_0 | |
1457 | && !signal_pass_state (signo)) | |
1458 | { | |
1459 | if (debug_linux_nat) | |
1460 | fprintf_unfiltered (gdb_stdlog, "\ | |
1461 | GPT: lwp %s had signal %s, but it is in no pass state\n", | |
1462 | target_pid_to_str (lp->ptid), | |
1463 | target_signal_to_string (signo)); | |
1464 | } | |
1465 | else | |
1466 | { | |
1467 | if (signo != TARGET_SIGNAL_0) | |
1468 | *status = W_STOPCODE (target_signal_to_host (signo)); | |
1469 | ||
1470 | if (debug_linux_nat) | |
1471 | fprintf_unfiltered (gdb_stdlog, | |
1472 | "GPT: lwp %s as pending signal %s\n", | |
1473 | target_pid_to_str (lp->ptid), | |
1474 | target_signal_to_string (signo)); | |
1475 | } | |
a0ef4274 | 1476 | } |
a0ef4274 | 1477 | else |
4c28f408 PA |
1478 | { |
1479 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) | |
1480 | { | |
2020b7ab PA |
1481 | struct thread_info *tp = find_thread_pid (lp->ptid); |
1482 | if (tp->stop_signal != TARGET_SIGNAL_0 | |
1483 | && signal_pass_state (tp->stop_signal)) | |
1484 | *status = W_STOPCODE (target_signal_to_host (tp->stop_signal)); | |
4c28f408 | 1485 | } |
4c28f408 PA |
1486 | else |
1487 | *status = lp->status; | |
1488 | } | |
a0ef4274 DJ |
1489 | |
1490 | return 0; | |
1491 | } | |
1492 | ||
d6b0e80f AC |
1493 | static int |
1494 | detach_callback (struct lwp_info *lp, void *data) | |
1495 | { | |
1496 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1497 | ||
1498 | if (debug_linux_nat && lp->status) | |
1499 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1500 | strsignal (WSTOPSIG (lp->status)), | |
1501 | target_pid_to_str (lp->ptid)); | |
1502 | ||
a0ef4274 DJ |
1503 | /* If there is a pending SIGSTOP, get rid of it. */ |
1504 | if (lp->signalled) | |
d6b0e80f | 1505 | { |
d6b0e80f AC |
1506 | if (debug_linux_nat) |
1507 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1508 | "DC: Sending SIGCONT to %s\n", |
1509 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1510 | |
a0ef4274 | 1511 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1512 | lp->signalled = 0; |
d6b0e80f AC |
1513 | } |
1514 | ||
1515 | /* We don't actually detach from the LWP that has an id equal to the | |
1516 | overall process id just yet. */ | |
1517 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1518 | { | |
a0ef4274 DJ |
1519 | int status = 0; |
1520 | ||
1521 | /* Pass on any pending signal for this LWP. */ | |
1522 | get_pending_status (lp, &status); | |
1523 | ||
d6b0e80f AC |
1524 | errno = 0; |
1525 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1526 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1527 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1528 | safe_strerror (errno)); |
1529 | ||
1530 | if (debug_linux_nat) | |
1531 | fprintf_unfiltered (gdb_stdlog, | |
1532 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1533 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1534 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1535 | |
1536 | delete_lwp (lp->ptid); | |
1537 | } | |
1538 | ||
1539 | return 0; | |
1540 | } | |
1541 | ||
1542 | static void | |
136d6dae | 1543 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1544 | { |
b84876c2 | 1545 | int pid; |
a0ef4274 DJ |
1546 | int status; |
1547 | enum target_signal sig; | |
d90e17a7 PA |
1548 | struct lwp_info *main_lwp; |
1549 | ||
1550 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1551 | |
b84876c2 PA |
1552 | if (target_can_async_p ()) |
1553 | linux_nat_async (NULL, 0); | |
1554 | ||
4c28f408 PA |
1555 | /* Stop all threads before detaching. ptrace requires that the |
1556 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1557 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1558 | /* ... and wait until all of them have reported back that |
1559 | they're no longer running. */ | |
d90e17a7 | 1560 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1561 | |
d90e17a7 | 1562 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1563 | |
1564 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1565 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1566 | ||
1567 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1568 | |
a0ef4274 DJ |
1569 | /* Pass on any pending signal for the last LWP. */ |
1570 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1571 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1572 | && WIFSTOPPED (status)) |
1573 | { | |
1574 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1575 | pass it along with PTRACE_DETACH. */ | |
1576 | args = alloca (8); | |
1577 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
1578 | fprintf_unfiltered (gdb_stdlog, | |
1579 | "LND: Sending signal %s to %s\n", | |
1580 | args, | |
d90e17a7 | 1581 | target_pid_to_str (main_lwp->ptid)); |
a0ef4274 DJ |
1582 | } |
1583 | ||
d90e17a7 | 1584 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1585 | |
7a7d3353 PA |
1586 | if (forks_exist_p ()) |
1587 | { | |
1588 | /* Multi-fork case. The current inferior_ptid is being detached | |
1589 | from, but there are other viable forks to debug. Detach from | |
1590 | the current fork, and context-switch to the first | |
1591 | available. */ | |
1592 | linux_fork_detach (args, from_tty); | |
1593 | ||
1594 | if (non_stop && target_can_async_p ()) | |
1595 | target_async (inferior_event_handler, 0); | |
1596 | } | |
1597 | else | |
1598 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1599 | } |
1600 | ||
1601 | /* Resume LP. */ | |
1602 | ||
1603 | static int | |
1604 | resume_callback (struct lwp_info *lp, void *data) | |
1605 | { | |
1606 | if (lp->stopped && lp->status == 0) | |
1607 | { | |
d90e17a7 PA |
1608 | if (debug_linux_nat) |
1609 | fprintf_unfiltered (gdb_stdlog, | |
1610 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", | |
1611 | target_pid_to_str (lp->ptid)); | |
1612 | ||
28439f5e PA |
1613 | linux_ops->to_resume (linux_ops, |
1614 | pid_to_ptid (GET_LWP (lp->ptid)), | |
10d6c8cd | 1615 | 0, TARGET_SIGNAL_0); |
d6b0e80f AC |
1616 | if (debug_linux_nat) |
1617 | fprintf_unfiltered (gdb_stdlog, | |
1618 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1619 | target_pid_to_str (lp->ptid)); | |
1620 | lp->stopped = 0; | |
1621 | lp->step = 0; | |
9f0bdab8 | 1622 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
d6b0e80f | 1623 | } |
57380f4e DJ |
1624 | else if (lp->stopped && debug_linux_nat) |
1625 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (has pending)\n", | |
1626 | target_pid_to_str (lp->ptid)); | |
1627 | else if (debug_linux_nat) | |
1628 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (not stopped)\n", | |
1629 | target_pid_to_str (lp->ptid)); | |
d6b0e80f AC |
1630 | |
1631 | return 0; | |
1632 | } | |
1633 | ||
1634 | static int | |
1635 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1636 | { | |
1637 | lp->resumed = 0; | |
1638 | return 0; | |
1639 | } | |
1640 | ||
1641 | static int | |
1642 | resume_set_callback (struct lwp_info *lp, void *data) | |
1643 | { | |
1644 | lp->resumed = 1; | |
1645 | return 0; | |
1646 | } | |
1647 | ||
1648 | static void | |
28439f5e PA |
1649 | linux_nat_resume (struct target_ops *ops, |
1650 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1651 | { |
7feb7d06 | 1652 | sigset_t prev_mask; |
d6b0e80f | 1653 | struct lwp_info *lp; |
d90e17a7 | 1654 | int resume_many; |
d6b0e80f | 1655 | |
76f50ad1 DJ |
1656 | if (debug_linux_nat) |
1657 | fprintf_unfiltered (gdb_stdlog, | |
1658 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1659 | step ? "step" : "resume", | |
1660 | target_pid_to_str (ptid), | |
1661 | signo ? strsignal (signo) : "0", | |
1662 | target_pid_to_str (inferior_ptid)); | |
1663 | ||
7feb7d06 | 1664 | block_child_signals (&prev_mask); |
b84876c2 | 1665 | |
d6b0e80f | 1666 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1667 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1668 | || ptid_is_pid (ptid)); | |
4c28f408 PA |
1669 | |
1670 | if (!non_stop) | |
1671 | { | |
d90e17a7 PA |
1672 | /* Mark the lwps we're resuming as resumed. */ |
1673 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
1674 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
4c28f408 | 1675 | } |
d90e17a7 PA |
1676 | else |
1677 | iterate_over_lwps (minus_one_ptid, resume_set_callback, NULL); | |
d6b0e80f | 1678 | |
d90e17a7 PA |
1679 | /* See if it's the current inferior that should be handled |
1680 | specially. */ | |
1681 | if (resume_many) | |
1682 | lp = find_lwp_pid (inferior_ptid); | |
1683 | else | |
1684 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1685 | gdb_assert (lp != NULL); |
d6b0e80f | 1686 | |
9f0bdab8 DJ |
1687 | /* Remember if we're stepping. */ |
1688 | lp->step = step; | |
d6b0e80f | 1689 | |
9f0bdab8 DJ |
1690 | /* If we have a pending wait status for this thread, there is no |
1691 | point in resuming the process. But first make sure that | |
1692 | linux_nat_wait won't preemptively handle the event - we | |
1693 | should never take this short-circuit if we are going to | |
1694 | leave LP running, since we have skipped resuming all the | |
1695 | other threads. This bit of code needs to be synchronized | |
1696 | with linux_nat_wait. */ | |
76f50ad1 | 1697 | |
9f0bdab8 DJ |
1698 | if (lp->status && WIFSTOPPED (lp->status)) |
1699 | { | |
d6b48e9c PA |
1700 | int saved_signo; |
1701 | struct inferior *inf; | |
76f50ad1 | 1702 | |
d90e17a7 | 1703 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); |
d6b48e9c PA |
1704 | gdb_assert (inf); |
1705 | saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1706 | ||
1707 | /* Defer to common code if we're gaining control of the | |
1708 | inferior. */ | |
1709 | if (inf->stop_soon == NO_STOP_QUIETLY | |
1710 | && signal_stop_state (saved_signo) == 0 | |
9f0bdab8 DJ |
1711 | && signal_print_state (saved_signo) == 0 |
1712 | && signal_pass_state (saved_signo) == 1) | |
d6b0e80f | 1713 | { |
9f0bdab8 DJ |
1714 | if (debug_linux_nat) |
1715 | fprintf_unfiltered (gdb_stdlog, | |
1716 | "LLR: Not short circuiting for ignored " | |
1717 | "status 0x%x\n", lp->status); | |
1718 | ||
d6b0e80f AC |
1719 | /* FIXME: What should we do if we are supposed to continue |
1720 | this thread with a signal? */ | |
1721 | gdb_assert (signo == TARGET_SIGNAL_0); | |
9f0bdab8 DJ |
1722 | signo = saved_signo; |
1723 | lp->status = 0; | |
1724 | } | |
1725 | } | |
76f50ad1 | 1726 | |
9f0bdab8 DJ |
1727 | if (lp->status) |
1728 | { | |
1729 | /* FIXME: What should we do if we are supposed to continue | |
1730 | this thread with a signal? */ | |
1731 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1732 | |
9f0bdab8 DJ |
1733 | if (debug_linux_nat) |
1734 | fprintf_unfiltered (gdb_stdlog, | |
1735 | "LLR: Short circuiting for status 0x%x\n", | |
1736 | lp->status); | |
d6b0e80f | 1737 | |
7feb7d06 PA |
1738 | restore_child_signals_mask (&prev_mask); |
1739 | if (target_can_async_p ()) | |
1740 | { | |
1741 | target_async (inferior_event_handler, 0); | |
1742 | /* Tell the event loop we have something to process. */ | |
1743 | async_file_mark (); | |
1744 | } | |
9f0bdab8 | 1745 | return; |
d6b0e80f AC |
1746 | } |
1747 | ||
9f0bdab8 DJ |
1748 | /* Mark LWP as not stopped to prevent it from being continued by |
1749 | resume_callback. */ | |
1750 | lp->stopped = 0; | |
1751 | ||
d90e17a7 PA |
1752 | if (resume_many) |
1753 | iterate_over_lwps (ptid, resume_callback, NULL); | |
1754 | ||
1755 | /* Convert to something the lower layer understands. */ | |
1756 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 1757 | |
28439f5e | 1758 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 DJ |
1759 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
1760 | ||
d6b0e80f AC |
1761 | if (debug_linux_nat) |
1762 | fprintf_unfiltered (gdb_stdlog, | |
1763 | "LLR: %s %s, %s (resume event thread)\n", | |
1764 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1765 | target_pid_to_str (ptid), | |
1766 | signo ? strsignal (signo) : "0"); | |
b84876c2 | 1767 | |
7feb7d06 | 1768 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 1769 | if (target_can_async_p ()) |
8ea051c5 | 1770 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1771 | } |
1772 | ||
1773 | /* Issue kill to specified lwp. */ | |
1774 | ||
1775 | static int tkill_failed; | |
1776 | ||
1777 | static int | |
1778 | kill_lwp (int lwpid, int signo) | |
1779 | { | |
1780 | errno = 0; | |
1781 | ||
1782 | /* Use tkill, if possible, in case we are using nptl threads. If tkill | |
1783 | fails, then we are not using nptl threads and we should be using kill. */ | |
1784 | ||
1785 | #ifdef HAVE_TKILL_SYSCALL | |
1786 | if (!tkill_failed) | |
1787 | { | |
1788 | int ret = syscall (__NR_tkill, lwpid, signo); | |
1789 | if (errno != ENOSYS) | |
1790 | return ret; | |
1791 | errno = 0; | |
1792 | tkill_failed = 1; | |
1793 | } | |
1794 | #endif | |
1795 | ||
1796 | return kill (lwpid, signo); | |
1797 | } | |
1798 | ||
3d799a95 DJ |
1799 | /* Handle a GNU/Linux extended wait response. If we see a clone |
1800 | event, we need to add the new LWP to our list (and not report the | |
1801 | trap to higher layers). This function returns non-zero if the | |
1802 | event should be ignored and we should wait again. If STOPPING is | |
1803 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
1804 | |
1805 | static int | |
3d799a95 DJ |
1806 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
1807 | int stopping) | |
d6b0e80f | 1808 | { |
3d799a95 DJ |
1809 | int pid = GET_LWP (lp->ptid); |
1810 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
1811 | struct lwp_info *new_lp = NULL; | |
1812 | int event = status >> 16; | |
d6b0e80f | 1813 | |
3d799a95 DJ |
1814 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
1815 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 1816 | { |
3d799a95 DJ |
1817 | unsigned long new_pid; |
1818 | int ret; | |
1819 | ||
1820 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 1821 | |
3d799a95 DJ |
1822 | /* If we haven't already seen the new PID stop, wait for it now. */ |
1823 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
1824 | { | |
1825 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
1826 | hits the SIGSTOP, but we're already attached. */ | |
1827 | ret = my_waitpid (new_pid, &status, | |
1828 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
1829 | if (ret == -1) | |
1830 | perror_with_name (_("waiting for new child")); | |
1831 | else if (ret != new_pid) | |
1832 | internal_error (__FILE__, __LINE__, | |
1833 | _("wait returned unexpected PID %d"), ret); | |
1834 | else if (!WIFSTOPPED (status)) | |
1835 | internal_error (__FILE__, __LINE__, | |
1836 | _("wait returned unexpected status 0x%x"), status); | |
1837 | } | |
1838 | ||
3a3e9ee3 | 1839 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 DJ |
1840 | |
1841 | if (event == PTRACE_EVENT_FORK) | |
1842 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
1843 | else if (event == PTRACE_EVENT_VFORK) | |
1844 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 1845 | else |
3d799a95 | 1846 | { |
4c28f408 PA |
1847 | struct cleanup *old_chain; |
1848 | ||
3d799a95 | 1849 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
d90e17a7 | 1850 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 1851 | new_lp->cloned = 1; |
4c28f408 | 1852 | new_lp->stopped = 1; |
d6b0e80f | 1853 | |
3d799a95 DJ |
1854 | if (WSTOPSIG (status) != SIGSTOP) |
1855 | { | |
1856 | /* This can happen if someone starts sending signals to | |
1857 | the new thread before it gets a chance to run, which | |
1858 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
1859 | This is an unlikely case, and harder to handle for | |
1860 | fork / vfork than for clone, so we do not try - but | |
1861 | we handle it for clone events here. We'll send | |
1862 | the other signal on to the thread below. */ | |
1863 | ||
1864 | new_lp->signalled = 1; | |
1865 | } | |
1866 | else | |
1867 | status = 0; | |
d6b0e80f | 1868 | |
4c28f408 | 1869 | if (non_stop) |
3d799a95 | 1870 | { |
4c28f408 PA |
1871 | /* Add the new thread to GDB's lists as soon as possible |
1872 | so that: | |
1873 | ||
1874 | 1) the frontend doesn't have to wait for a stop to | |
1875 | display them, and, | |
1876 | ||
1877 | 2) we tag it with the correct running state. */ | |
1878 | ||
1879 | /* If the thread_db layer is active, let it know about | |
1880 | this new thread, and add it to GDB's list. */ | |
1881 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
1882 | { | |
1883 | /* We're not using thread_db. Add it to GDB's | |
1884 | list. */ | |
1885 | target_post_attach (GET_LWP (new_lp->ptid)); | |
1886 | add_thread (new_lp->ptid); | |
1887 | } | |
1888 | ||
1889 | if (!stopping) | |
1890 | { | |
1891 | set_running (new_lp->ptid, 1); | |
1892 | set_executing (new_lp->ptid, 1); | |
1893 | } | |
1894 | } | |
1895 | ||
1896 | if (!stopping) | |
1897 | { | |
1898 | new_lp->stopped = 0; | |
3d799a95 | 1899 | new_lp->resumed = 1; |
4c28f408 | 1900 | ptrace (PTRACE_CONT, new_pid, 0, |
3d799a95 DJ |
1901 | status ? WSTOPSIG (status) : 0); |
1902 | } | |
d6b0e80f | 1903 | |
3d799a95 DJ |
1904 | if (debug_linux_nat) |
1905 | fprintf_unfiltered (gdb_stdlog, | |
1906 | "LHEW: Got clone event from LWP %ld, resuming\n", | |
1907 | GET_LWP (lp->ptid)); | |
1908 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1909 | ||
1910 | return 1; | |
1911 | } | |
1912 | ||
1913 | return 0; | |
d6b0e80f AC |
1914 | } |
1915 | ||
3d799a95 DJ |
1916 | if (event == PTRACE_EVENT_EXEC) |
1917 | { | |
1918 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
1919 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 1920 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 DJ |
1921 | |
1922 | if (linux_parent_pid) | |
1923 | { | |
1924 | detach_breakpoints (linux_parent_pid); | |
1925 | ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0); | |
1926 | ||
1927 | linux_parent_pid = 0; | |
1928 | } | |
1929 | ||
25b22b0a PA |
1930 | /* At this point, all inserted breakpoints are gone. Doing this |
1931 | as soon as we detect an exec prevents the badness of deleting | |
1932 | a breakpoint writing the current "shadow contents" to lift | |
1933 | the bp. That shadow is NOT valid after an exec. | |
1934 | ||
1935 | Note that we have to do this after the detach_breakpoints | |
1936 | call above, otherwise breakpoints wouldn't be lifted from the | |
1937 | parent on a vfork, because detach_breakpoints would think | |
1938 | that breakpoints are not inserted. */ | |
1939 | mark_breakpoints_out (); | |
3d799a95 DJ |
1940 | return 0; |
1941 | } | |
1942 | ||
1943 | internal_error (__FILE__, __LINE__, | |
1944 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
1945 | } |
1946 | ||
1947 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
1948 | exited. */ | |
1949 | ||
1950 | static int | |
1951 | wait_lwp (struct lwp_info *lp) | |
1952 | { | |
1953 | pid_t pid; | |
1954 | int status; | |
1955 | int thread_dead = 0; | |
1956 | ||
1957 | gdb_assert (!lp->stopped); | |
1958 | gdb_assert (lp->status == 0); | |
1959 | ||
58aecb61 | 1960 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
1961 | if (pid == -1 && errno == ECHILD) |
1962 | { | |
58aecb61 | 1963 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
1964 | if (pid == -1 && errno == ECHILD) |
1965 | { | |
1966 | /* The thread has previously exited. We need to delete it | |
1967 | now because, for some vendor 2.4 kernels with NPTL | |
1968 | support backported, there won't be an exit event unless | |
1969 | it is the main thread. 2.6 kernels will report an exit | |
1970 | event for each thread that exits, as expected. */ | |
1971 | thread_dead = 1; | |
1972 | if (debug_linux_nat) | |
1973 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
1974 | target_pid_to_str (lp->ptid)); | |
1975 | } | |
1976 | } | |
1977 | ||
1978 | if (!thread_dead) | |
1979 | { | |
1980 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
1981 | ||
1982 | if (debug_linux_nat) | |
1983 | { | |
1984 | fprintf_unfiltered (gdb_stdlog, | |
1985 | "WL: waitpid %s received %s\n", | |
1986 | target_pid_to_str (lp->ptid), | |
1987 | status_to_str (status)); | |
1988 | } | |
1989 | } | |
1990 | ||
1991 | /* Check if the thread has exited. */ | |
1992 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
1993 | { | |
1994 | thread_dead = 1; | |
1995 | if (debug_linux_nat) | |
1996 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
1997 | target_pid_to_str (lp->ptid)); | |
1998 | } | |
1999 | ||
2000 | if (thread_dead) | |
2001 | { | |
e26af52f | 2002 | exit_lwp (lp); |
d6b0e80f AC |
2003 | return 0; |
2004 | } | |
2005 | ||
2006 | gdb_assert (WIFSTOPPED (status)); | |
2007 | ||
2008 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
2009 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2010 | { | |
2011 | if (debug_linux_nat) | |
2012 | fprintf_unfiltered (gdb_stdlog, | |
2013 | "WL: Handling extended status 0x%06x\n", | |
2014 | status); | |
3d799a95 | 2015 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2016 | return wait_lwp (lp); |
2017 | } | |
2018 | ||
2019 | return status; | |
2020 | } | |
2021 | ||
9f0bdab8 DJ |
2022 | /* Save the most recent siginfo for LP. This is currently only called |
2023 | for SIGTRAP; some ports use the si_addr field for | |
2024 | target_stopped_data_address. In the future, it may also be used to | |
2025 | restore the siginfo of requeued signals. */ | |
2026 | ||
2027 | static void | |
2028 | save_siginfo (struct lwp_info *lp) | |
2029 | { | |
2030 | errno = 0; | |
2031 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2032 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2033 | ||
2034 | if (errno != 0) | |
2035 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2036 | } | |
2037 | ||
d6b0e80f AC |
2038 | /* Send a SIGSTOP to LP. */ |
2039 | ||
2040 | static int | |
2041 | stop_callback (struct lwp_info *lp, void *data) | |
2042 | { | |
2043 | if (!lp->stopped && !lp->signalled) | |
2044 | { | |
2045 | int ret; | |
2046 | ||
2047 | if (debug_linux_nat) | |
2048 | { | |
2049 | fprintf_unfiltered (gdb_stdlog, | |
2050 | "SC: kill %s **<SIGSTOP>**\n", | |
2051 | target_pid_to_str (lp->ptid)); | |
2052 | } | |
2053 | errno = 0; | |
2054 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2055 | if (debug_linux_nat) | |
2056 | { | |
2057 | fprintf_unfiltered (gdb_stdlog, | |
2058 | "SC: lwp kill %d %s\n", | |
2059 | ret, | |
2060 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2061 | } | |
2062 | ||
2063 | lp->signalled = 1; | |
2064 | gdb_assert (lp->status == 0); | |
2065 | } | |
2066 | ||
2067 | return 0; | |
2068 | } | |
2069 | ||
57380f4e | 2070 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2071 | |
2072 | static int | |
57380f4e DJ |
2073 | linux_nat_has_pending_sigint (int pid) |
2074 | { | |
2075 | sigset_t pending, blocked, ignored; | |
2076 | int i; | |
2077 | ||
2078 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2079 | ||
2080 | if (sigismember (&pending, SIGINT) | |
2081 | && !sigismember (&ignored, SIGINT)) | |
2082 | return 1; | |
2083 | ||
2084 | return 0; | |
2085 | } | |
2086 | ||
2087 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2088 | ||
2089 | static int | |
2090 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2091 | { |
57380f4e DJ |
2092 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2093 | flag to consume the next one. */ | |
2094 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2095 | && WSTOPSIG (lp->status) == SIGINT) | |
2096 | lp->status = 0; | |
2097 | else | |
2098 | lp->ignore_sigint = 1; | |
2099 | ||
2100 | return 0; | |
2101 | } | |
2102 | ||
2103 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2104 | This function is called after we know the LWP has stopped; if the LWP | |
2105 | stopped before the expected SIGINT was delivered, then it will never have | |
2106 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2107 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2108 | |
57380f4e DJ |
2109 | static void |
2110 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2111 | { | |
2112 | if (!lp->ignore_sigint) | |
2113 | return; | |
2114 | ||
2115 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2116 | { | |
2117 | if (debug_linux_nat) | |
2118 | fprintf_unfiltered (gdb_stdlog, | |
2119 | "MCIS: Clearing bogus flag for %s\n", | |
2120 | target_pid_to_str (lp->ptid)); | |
2121 | lp->ignore_sigint = 0; | |
2122 | } | |
2123 | } | |
2124 | ||
2125 | /* Wait until LP is stopped. */ | |
2126 | ||
2127 | static int | |
2128 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2129 | { | |
d6b0e80f AC |
2130 | if (!lp->stopped) |
2131 | { | |
2132 | int status; | |
2133 | ||
2134 | status = wait_lwp (lp); | |
2135 | if (status == 0) | |
2136 | return 0; | |
2137 | ||
57380f4e DJ |
2138 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2139 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2140 | { |
57380f4e | 2141 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2142 | |
2143 | errno = 0; | |
2144 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2145 | if (debug_linux_nat) | |
2146 | fprintf_unfiltered (gdb_stdlog, | |
57380f4e | 2147 | "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n", |
d6b0e80f AC |
2148 | target_pid_to_str (lp->ptid), |
2149 | errno ? safe_strerror (errno) : "OK"); | |
2150 | ||
57380f4e | 2151 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2152 | } |
2153 | ||
57380f4e DJ |
2154 | maybe_clear_ignore_sigint (lp); |
2155 | ||
d6b0e80f AC |
2156 | if (WSTOPSIG (status) != SIGSTOP) |
2157 | { | |
2158 | if (WSTOPSIG (status) == SIGTRAP) | |
2159 | { | |
2160 | /* If a LWP other than the LWP that we're reporting an | |
2161 | event for has hit a GDB breakpoint (as opposed to | |
2162 | some random trap signal), then just arrange for it to | |
2163 | hit it again later. We don't keep the SIGTRAP status | |
2164 | and don't forward the SIGTRAP signal to the LWP. We | |
2165 | will handle the current event, eventually we will | |
2166 | resume all LWPs, and this one will get its breakpoint | |
2167 | trap again. | |
2168 | ||
2169 | If we do not do this, then we run the risk that the | |
2170 | user will delete or disable the breakpoint, but the | |
2171 | thread will have already tripped on it. */ | |
2172 | ||
9f0bdab8 DJ |
2173 | /* Save the trap's siginfo in case we need it later. */ |
2174 | save_siginfo (lp); | |
2175 | ||
d6b0e80f AC |
2176 | /* Now resume this LWP and get the SIGSTOP event. */ |
2177 | errno = 0; | |
2178 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2179 | if (debug_linux_nat) | |
2180 | { | |
2181 | fprintf_unfiltered (gdb_stdlog, | |
2182 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2183 | target_pid_to_str (lp->ptid), | |
2184 | errno ? safe_strerror (errno) : "OK"); | |
2185 | ||
2186 | fprintf_unfiltered (gdb_stdlog, | |
2187 | "SWC: Candidate SIGTRAP event in %s\n", | |
2188 | target_pid_to_str (lp->ptid)); | |
2189 | } | |
710151dd PA |
2190 | /* Hold this event/waitstatus while we check to see if |
2191 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2192 | stop_wait_callback (lp, NULL); |
710151dd | 2193 | |
7feb7d06 PA |
2194 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2195 | there's another event, throw it back into the | |
2196 | queue. */ | |
2197 | if (lp->status) | |
710151dd | 2198 | { |
7feb7d06 PA |
2199 | if (debug_linux_nat) |
2200 | fprintf_unfiltered (gdb_stdlog, | |
2201 | "SWC: kill %s, %s\n", | |
2202 | target_pid_to_str (lp->ptid), | |
2203 | status_to_str ((int) status)); | |
2204 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2205 | } |
7feb7d06 PA |
2206 | |
2207 | /* Save the sigtrap event. */ | |
2208 | lp->status = status; | |
d6b0e80f AC |
2209 | return 0; |
2210 | } | |
2211 | else | |
2212 | { | |
2213 | /* The thread was stopped with a signal other than | |
2214 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
2215 | ||
2216 | if (debug_linux_nat) | |
2217 | { | |
2218 | fprintf_unfiltered (gdb_stdlog, | |
2219 | "SWC: Pending event %s in %s\n", | |
2220 | status_to_str ((int) status), | |
2221 | target_pid_to_str (lp->ptid)); | |
2222 | } | |
2223 | /* Now resume this LWP and get the SIGSTOP event. */ | |
2224 | errno = 0; | |
2225 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2226 | if (debug_linux_nat) | |
2227 | fprintf_unfiltered (gdb_stdlog, | |
2228 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2229 | target_pid_to_str (lp->ptid), | |
2230 | errno ? safe_strerror (errno) : "OK"); | |
2231 | ||
2232 | /* Hold this event/waitstatus while we check to see if | |
2233 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2234 | stop_wait_callback (lp, NULL); |
710151dd PA |
2235 | |
2236 | /* If the lp->status field is still empty, use it to | |
2237 | hold this event. If not, then this event must be | |
2238 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2239 | if (lp->status) |
d6b0e80f AC |
2240 | { |
2241 | if (debug_linux_nat) | |
2242 | { | |
2243 | fprintf_unfiltered (gdb_stdlog, | |
2244 | "SWC: kill %s, %s\n", | |
2245 | target_pid_to_str (lp->ptid), | |
2246 | status_to_str ((int) status)); | |
2247 | } | |
2248 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2249 | } | |
710151dd PA |
2250 | else |
2251 | lp->status = status; | |
d6b0e80f AC |
2252 | return 0; |
2253 | } | |
2254 | } | |
2255 | else | |
2256 | { | |
2257 | /* We caught the SIGSTOP that we intended to catch, so | |
2258 | there's no SIGSTOP pending. */ | |
2259 | lp->stopped = 1; | |
2260 | lp->signalled = 0; | |
2261 | } | |
2262 | } | |
2263 | ||
2264 | return 0; | |
2265 | } | |
2266 | ||
d6b0e80f AC |
2267 | /* Return non-zero if LP has a wait status pending. */ |
2268 | ||
2269 | static int | |
2270 | status_callback (struct lwp_info *lp, void *data) | |
2271 | { | |
2272 | /* Only report a pending wait status if we pretend that this has | |
2273 | indeed been resumed. */ | |
d90e17a7 PA |
2274 | /* We check for lp->waitstatus in addition to lp->status, because we |
2275 | can have pending process exits recorded in lp->waitstatus, and | |
2276 | W_EXITCODE(0,0) == 0. */ | |
2277 | return ((lp->status != 0 | |
2278 | || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2279 | && lp->resumed); | |
d6b0e80f AC |
2280 | } |
2281 | ||
2282 | /* Return non-zero if LP isn't stopped. */ | |
2283 | ||
2284 | static int | |
2285 | running_callback (struct lwp_info *lp, void *data) | |
2286 | { | |
2287 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2288 | } | |
2289 | ||
2290 | /* Count the LWP's that have had events. */ | |
2291 | ||
2292 | static int | |
2293 | count_events_callback (struct lwp_info *lp, void *data) | |
2294 | { | |
2295 | int *count = data; | |
2296 | ||
2297 | gdb_assert (count != NULL); | |
2298 | ||
e09490f1 DJ |
2299 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
2300 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2301 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2302 | (*count)++; | |
2303 | ||
2304 | return 0; | |
2305 | } | |
2306 | ||
2307 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2308 | ||
2309 | static int | |
2310 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2311 | { | |
2312 | if (lp->step && lp->status != 0) | |
2313 | return 1; | |
2314 | else | |
2315 | return 0; | |
2316 | } | |
2317 | ||
2318 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2319 | ||
2320 | static int | |
2321 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2322 | { | |
2323 | int *selector = data; | |
2324 | ||
2325 | gdb_assert (selector != NULL); | |
2326 | ||
e09490f1 DJ |
2327 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
2328 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2329 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2330 | if ((*selector)-- == 0) | |
2331 | return 1; | |
2332 | ||
2333 | return 0; | |
2334 | } | |
2335 | ||
710151dd PA |
2336 | static int |
2337 | cancel_breakpoint (struct lwp_info *lp) | |
2338 | { | |
2339 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2340 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2341 | LWP. We will handle the current event, eventually we will resume | |
2342 | this LWP, and this breakpoint will trap again. | |
2343 | ||
2344 | If we do not do this, then we run the risk that the user will | |
2345 | delete or disable the breakpoint, but the LWP will have already | |
2346 | tripped on it. */ | |
2347 | ||
515630c5 UW |
2348 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2349 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2350 | CORE_ADDR pc; | |
2351 | ||
2352 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
2353 | if (breakpoint_inserted_here_p (pc)) | |
710151dd PA |
2354 | { |
2355 | if (debug_linux_nat) | |
2356 | fprintf_unfiltered (gdb_stdlog, | |
2357 | "CB: Push back breakpoint for %s\n", | |
2358 | target_pid_to_str (lp->ptid)); | |
2359 | ||
2360 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2361 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2362 | regcache_write_pc (regcache, pc); | |
2363 | ||
710151dd PA |
2364 | return 1; |
2365 | } | |
2366 | return 0; | |
2367 | } | |
2368 | ||
d6b0e80f AC |
2369 | static int |
2370 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2371 | { | |
2372 | struct lwp_info *event_lp = data; | |
2373 | ||
2374 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2375 | if (lp == event_lp) | |
2376 | return 0; | |
2377 | ||
2378 | /* If a LWP other than the LWP that we're reporting an event for has | |
2379 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2380 | then just arrange for it to hit it again later. We don't keep | |
2381 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2382 | LWP. We will handle the current event, eventually we will resume | |
2383 | all LWPs, and this one will get its breakpoint trap again. | |
2384 | ||
2385 | If we do not do this, then we run the risk that the user will | |
2386 | delete or disable the breakpoint, but the LWP will have already | |
2387 | tripped on it. */ | |
2388 | ||
2389 | if (lp->status != 0 | |
2390 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP | |
710151dd PA |
2391 | && cancel_breakpoint (lp)) |
2392 | /* Throw away the SIGTRAP. */ | |
2393 | lp->status = 0; | |
d6b0e80f AC |
2394 | |
2395 | return 0; | |
2396 | } | |
2397 | ||
2398 | /* Select one LWP out of those that have events pending. */ | |
2399 | ||
2400 | static void | |
d90e17a7 | 2401 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
2402 | { |
2403 | int num_events = 0; | |
2404 | int random_selector; | |
2405 | struct lwp_info *event_lp; | |
2406 | ||
ac264b3b | 2407 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2408 | (*orig_lp)->status = *status; |
2409 | ||
2410 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
2411 | event_lp = iterate_over_lwps (filter, |
2412 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
2413 | if (event_lp != NULL) |
2414 | { | |
2415 | if (debug_linux_nat) | |
2416 | fprintf_unfiltered (gdb_stdlog, | |
2417 | "SEL: Select single-step %s\n", | |
2418 | target_pid_to_str (event_lp->ptid)); | |
2419 | } | |
2420 | else | |
2421 | { | |
2422 | /* No single-stepping LWP. Select one at random, out of those | |
2423 | which have had SIGTRAP events. */ | |
2424 | ||
2425 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 2426 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
2427 | |
2428 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2429 | random_selector = (int) | |
2430 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2431 | ||
2432 | if (debug_linux_nat && num_events > 1) | |
2433 | fprintf_unfiltered (gdb_stdlog, | |
2434 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2435 | num_events, random_selector); | |
2436 | ||
d90e17a7 PA |
2437 | event_lp = iterate_over_lwps (filter, |
2438 | select_event_lwp_callback, | |
d6b0e80f AC |
2439 | &random_selector); |
2440 | } | |
2441 | ||
2442 | if (event_lp != NULL) | |
2443 | { | |
2444 | /* Switch the event LWP. */ | |
2445 | *orig_lp = event_lp; | |
2446 | *status = event_lp->status; | |
2447 | } | |
2448 | ||
2449 | /* Flush the wait status for the event LWP. */ | |
2450 | (*orig_lp)->status = 0; | |
2451 | } | |
2452 | ||
2453 | /* Return non-zero if LP has been resumed. */ | |
2454 | ||
2455 | static int | |
2456 | resumed_callback (struct lwp_info *lp, void *data) | |
2457 | { | |
2458 | return lp->resumed; | |
2459 | } | |
2460 | ||
d6b0e80f AC |
2461 | /* Stop an active thread, verify it still exists, then resume it. */ |
2462 | ||
2463 | static int | |
2464 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
2465 | { | |
2466 | struct lwp_info *ptr; | |
2467 | ||
2468 | if (!lp->stopped && !lp->signalled) | |
2469 | { | |
2470 | stop_callback (lp, NULL); | |
2471 | stop_wait_callback (lp, NULL); | |
2472 | /* Resume if the lwp still exists. */ | |
2473 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
2474 | if (lp == ptr) | |
2475 | { | |
2476 | resume_callback (lp, NULL); | |
2477 | resume_set_callback (lp, NULL); | |
2478 | } | |
2479 | } | |
2480 | return 0; | |
2481 | } | |
2482 | ||
02f3fc28 | 2483 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 2484 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
2485 | static struct lwp_info * |
2486 | linux_nat_filter_event (int lwpid, int status, int options) | |
2487 | { | |
2488 | struct lwp_info *lp; | |
2489 | ||
2490 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2491 | ||
2492 | /* Check for stop events reported by a process we didn't already | |
2493 | know about - anything not already in our LWP list. | |
2494 | ||
2495 | If we're expecting to receive stopped processes after | |
2496 | fork, vfork, and clone events, then we'll just add the | |
2497 | new one to our list and go back to waiting for the event | |
2498 | to be reported - the stopped process might be returned | |
2499 | from waitpid before or after the event is. */ | |
2500 | if (WIFSTOPPED (status) && !lp) | |
2501 | { | |
2502 | linux_record_stopped_pid (lwpid, status); | |
2503 | return NULL; | |
2504 | } | |
2505 | ||
2506 | /* Make sure we don't report an event for the exit of an LWP not in | |
2507 | our list, i.e. not part of the current process. This can happen | |
2508 | if we detach from a program we original forked and then it | |
2509 | exits. */ | |
2510 | if (!WIFSTOPPED (status) && !lp) | |
2511 | return NULL; | |
2512 | ||
2513 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
2514 | CLONE_PTRACE processes which do not use the thread library - | |
2515 | otherwise we wouldn't find the new LWP this way. That doesn't | |
2516 | currently work, and the following code is currently unreachable | |
2517 | due to the two blocks above. If it's fixed some day, this code | |
2518 | should be broken out into a function so that we can also pick up | |
2519 | LWPs from the new interface. */ | |
2520 | if (!lp) | |
2521 | { | |
2522 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
2523 | if (options & __WCLONE) | |
2524 | lp->cloned = 1; | |
2525 | ||
2526 | gdb_assert (WIFSTOPPED (status) | |
2527 | && WSTOPSIG (status) == SIGSTOP); | |
2528 | lp->signalled = 1; | |
2529 | ||
2530 | if (!in_thread_list (inferior_ptid)) | |
2531 | { | |
2532 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
2533 | GET_PID (inferior_ptid)); | |
2534 | add_thread (inferior_ptid); | |
2535 | } | |
2536 | ||
2537 | add_thread (lp->ptid); | |
2538 | } | |
2539 | ||
2540 | /* Save the trap's siginfo in case we need it later. */ | |
2541 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) | |
2542 | save_siginfo (lp); | |
2543 | ||
2544 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
2545 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2546 | { | |
2547 | if (debug_linux_nat) | |
2548 | fprintf_unfiltered (gdb_stdlog, | |
2549 | "LLW: Handling extended status 0x%06x\n", | |
2550 | status); | |
2551 | if (linux_handle_extended_wait (lp, status, 0)) | |
2552 | return NULL; | |
2553 | } | |
2554 | ||
2555 | /* Check if the thread has exited. */ | |
d90e17a7 PA |
2556 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
2557 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 2558 | { |
9db03742 JB |
2559 | /* If this is the main thread, we must stop all threads and verify |
2560 | if they are still alive. This is because in the nptl thread model | |
2561 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
2562 | other than the main thread. We only get the main thread exit |
2563 | signal once all child threads have already exited. If we | |
2564 | stop all the threads and use the stop_wait_callback to check | |
2565 | if they have exited we can determine whether this signal | |
2566 | should be ignored or whether it means the end of the debugged | |
2567 | application, regardless of which threading model is being | |
5d3b6af6 | 2568 | used. */ |
02f3fc28 PA |
2569 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
2570 | { | |
2571 | lp->stopped = 1; | |
d90e17a7 PA |
2572 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
2573 | stop_and_resume_callback, NULL); | |
02f3fc28 PA |
2574 | } |
2575 | ||
2576 | if (debug_linux_nat) | |
2577 | fprintf_unfiltered (gdb_stdlog, | |
2578 | "LLW: %s exited.\n", | |
2579 | target_pid_to_str (lp->ptid)); | |
2580 | ||
d90e17a7 | 2581 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
2582 | { |
2583 | /* If there is at least one more LWP, then the exit signal | |
2584 | was not the end of the debugged application and should be | |
2585 | ignored. */ | |
2586 | exit_lwp (lp); | |
2587 | return NULL; | |
2588 | } | |
02f3fc28 PA |
2589 | } |
2590 | ||
2591 | /* Check if the current LWP has previously exited. In the nptl | |
2592 | thread model, LWPs other than the main thread do not issue | |
2593 | signals when they exit so we must check whenever the thread has | |
2594 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 2595 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 2596 | { |
d90e17a7 PA |
2597 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
2598 | ||
02f3fc28 PA |
2599 | if (debug_linux_nat) |
2600 | fprintf_unfiltered (gdb_stdlog, | |
2601 | "LLW: %s exited.\n", | |
2602 | target_pid_to_str (lp->ptid)); | |
2603 | ||
2604 | exit_lwp (lp); | |
2605 | ||
2606 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 2607 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
2608 | |
2609 | /* Discard the event. */ | |
2610 | return NULL; | |
2611 | } | |
2612 | ||
2613 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
2614 | an attempt to stop an LWP. */ | |
2615 | if (lp->signalled | |
2616 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
2617 | { | |
2618 | if (debug_linux_nat) | |
2619 | fprintf_unfiltered (gdb_stdlog, | |
2620 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
2621 | target_pid_to_str (lp->ptid)); | |
2622 | ||
2623 | /* This is a delayed SIGSTOP. */ | |
2624 | lp->signalled = 0; | |
2625 | ||
2626 | registers_changed (); | |
2627 | ||
28439f5e | 2628 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
02f3fc28 PA |
2629 | lp->step, TARGET_SIGNAL_0); |
2630 | if (debug_linux_nat) | |
2631 | fprintf_unfiltered (gdb_stdlog, | |
2632 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
2633 | lp->step ? | |
2634 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2635 | target_pid_to_str (lp->ptid)); | |
2636 | ||
2637 | lp->stopped = 0; | |
2638 | gdb_assert (lp->resumed); | |
2639 | ||
2640 | /* Discard the event. */ | |
2641 | return NULL; | |
2642 | } | |
2643 | ||
57380f4e DJ |
2644 | /* Make sure we don't report a SIGINT that we have already displayed |
2645 | for another thread. */ | |
2646 | if (lp->ignore_sigint | |
2647 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
2648 | { | |
2649 | if (debug_linux_nat) | |
2650 | fprintf_unfiltered (gdb_stdlog, | |
2651 | "LLW: Delayed SIGINT caught for %s.\n", | |
2652 | target_pid_to_str (lp->ptid)); | |
2653 | ||
2654 | /* This is a delayed SIGINT. */ | |
2655 | lp->ignore_sigint = 0; | |
2656 | ||
2657 | registers_changed (); | |
28439f5e | 2658 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
2659 | lp->step, TARGET_SIGNAL_0); |
2660 | if (debug_linux_nat) | |
2661 | fprintf_unfiltered (gdb_stdlog, | |
2662 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
2663 | lp->step ? | |
2664 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2665 | target_pid_to_str (lp->ptid)); | |
2666 | ||
2667 | lp->stopped = 0; | |
2668 | gdb_assert (lp->resumed); | |
2669 | ||
2670 | /* Discard the event. */ | |
2671 | return NULL; | |
2672 | } | |
2673 | ||
02f3fc28 PA |
2674 | /* An interesting event. */ |
2675 | gdb_assert (lp); | |
2676 | return lp; | |
2677 | } | |
2678 | ||
d6b0e80f | 2679 | static ptid_t |
7feb7d06 | 2680 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
2681 | ptid_t ptid, struct target_waitstatus *ourstatus, |
2682 | int target_options) | |
d6b0e80f | 2683 | { |
7feb7d06 | 2684 | static sigset_t prev_mask; |
d6b0e80f AC |
2685 | struct lwp_info *lp = NULL; |
2686 | int options = 0; | |
2687 | int status = 0; | |
d90e17a7 | 2688 | pid_t pid; |
d6b0e80f | 2689 | |
b84876c2 PA |
2690 | if (debug_linux_nat_async) |
2691 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); | |
2692 | ||
f973ed9c DJ |
2693 | /* The first time we get here after starting a new inferior, we may |
2694 | not have added it to the LWP list yet - this is the earliest | |
2695 | moment at which we know its PID. */ | |
d90e17a7 | 2696 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 2697 | { |
27c9d204 PA |
2698 | /* Upgrade the main thread's ptid. */ |
2699 | thread_change_ptid (inferior_ptid, | |
2700 | BUILD_LWP (GET_PID (inferior_ptid), | |
2701 | GET_PID (inferior_ptid))); | |
2702 | ||
f973ed9c DJ |
2703 | lp = add_lwp (inferior_ptid); |
2704 | lp->resumed = 1; | |
2705 | } | |
2706 | ||
7feb7d06 PA |
2707 | /* Make sure SIGCHLD is blocked. */ |
2708 | block_child_signals (&prev_mask); | |
d6b0e80f | 2709 | |
d90e17a7 PA |
2710 | if (ptid_equal (ptid, minus_one_ptid)) |
2711 | pid = -1; | |
2712 | else if (ptid_is_pid (ptid)) | |
2713 | /* A request to wait for a specific tgid. This is not possible | |
2714 | with waitpid, so instead, we wait for any child, and leave | |
2715 | children we're not interested in right now with a pending | |
2716 | status to report later. */ | |
2717 | pid = -1; | |
2718 | else | |
2719 | pid = GET_LWP (ptid); | |
2720 | ||
d6b0e80f | 2721 | retry: |
d90e17a7 PA |
2722 | lp = NULL; |
2723 | status = 0; | |
d6b0e80f | 2724 | |
f973ed9c | 2725 | /* Make sure there is at least one LWP that has been resumed. */ |
d90e17a7 | 2726 | gdb_assert (iterate_over_lwps (ptid, resumed_callback, NULL)); |
d6b0e80f AC |
2727 | |
2728 | /* First check if there is a LWP with a wait status pending. */ | |
2729 | if (pid == -1) | |
2730 | { | |
2731 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 2732 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
2733 | if (lp) |
2734 | { | |
2735 | status = lp->status; | |
2736 | lp->status = 0; | |
2737 | ||
2738 | if (debug_linux_nat && status) | |
2739 | fprintf_unfiltered (gdb_stdlog, | |
2740 | "LLW: Using pending wait status %s for %s.\n", | |
2741 | status_to_str (status), | |
2742 | target_pid_to_str (lp->ptid)); | |
2743 | } | |
2744 | ||
b84876c2 | 2745 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
2746 | cloned and uncloned processes. We start with the cloned |
2747 | processes. */ | |
d6b0e80f AC |
2748 | options = __WCLONE | WNOHANG; |
2749 | } | |
2750 | else if (is_lwp (ptid)) | |
2751 | { | |
2752 | if (debug_linux_nat) | |
2753 | fprintf_unfiltered (gdb_stdlog, | |
2754 | "LLW: Waiting for specific LWP %s.\n", | |
2755 | target_pid_to_str (ptid)); | |
2756 | ||
2757 | /* We have a specific LWP to check. */ | |
2758 | lp = find_lwp_pid (ptid); | |
2759 | gdb_assert (lp); | |
2760 | status = lp->status; | |
2761 | lp->status = 0; | |
2762 | ||
2763 | if (debug_linux_nat && status) | |
2764 | fprintf_unfiltered (gdb_stdlog, | |
2765 | "LLW: Using pending wait status %s for %s.\n", | |
2766 | status_to_str (status), | |
2767 | target_pid_to_str (lp->ptid)); | |
2768 | ||
2769 | /* If we have to wait, take into account whether PID is a cloned | |
2770 | process or not. And we have to convert it to something that | |
2771 | the layer beneath us can understand. */ | |
2772 | options = lp->cloned ? __WCLONE : 0; | |
2773 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
2774 | |
2775 | /* We check for lp->waitstatus in addition to lp->status, | |
2776 | because we can have pending process exits recorded in | |
2777 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
2778 | an additional lp->status_p flag. */ | |
2779 | if (status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
2780 | lp = NULL; | |
d6b0e80f AC |
2781 | } |
2782 | ||
d90e17a7 | 2783 | if (lp && lp->signalled) |
d6b0e80f AC |
2784 | { |
2785 | /* A pending SIGSTOP may interfere with the normal stream of | |
2786 | events. In a typical case where interference is a problem, | |
2787 | we have a SIGSTOP signal pending for LWP A while | |
2788 | single-stepping it, encounter an event in LWP B, and take the | |
2789 | pending SIGSTOP while trying to stop LWP A. After processing | |
2790 | the event in LWP B, LWP A is continued, and we'll never see | |
2791 | the SIGTRAP associated with the last time we were | |
2792 | single-stepping LWP A. */ | |
2793 | ||
2794 | /* Resume the thread. It should halt immediately returning the | |
2795 | pending SIGSTOP. */ | |
2796 | registers_changed (); | |
28439f5e | 2797 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 2798 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
2799 | if (debug_linux_nat) |
2800 | fprintf_unfiltered (gdb_stdlog, | |
2801 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
2802 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2803 | target_pid_to_str (lp->ptid)); | |
2804 | lp->stopped = 0; | |
2805 | gdb_assert (lp->resumed); | |
2806 | ||
2807 | /* This should catch the pending SIGSTOP. */ | |
2808 | stop_wait_callback (lp, NULL); | |
2809 | } | |
2810 | ||
b84876c2 PA |
2811 | if (!target_can_async_p ()) |
2812 | { | |
2813 | /* Causes SIGINT to be passed on to the attached process. */ | |
2814 | set_sigint_trap (); | |
b84876c2 | 2815 | } |
d6b0e80f | 2816 | |
47608cb1 PA |
2817 | /* Translate generic target_wait options into waitpid options. */ |
2818 | if (target_options & TARGET_WNOHANG) | |
2819 | options |= WNOHANG; | |
7feb7d06 | 2820 | |
d90e17a7 | 2821 | while (lp == NULL) |
d6b0e80f AC |
2822 | { |
2823 | pid_t lwpid; | |
2824 | ||
7feb7d06 | 2825 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 2826 | |
d6b0e80f AC |
2827 | if (lwpid > 0) |
2828 | { | |
2829 | gdb_assert (pid == -1 || lwpid == pid); | |
2830 | ||
2831 | if (debug_linux_nat) | |
2832 | { | |
2833 | fprintf_unfiltered (gdb_stdlog, | |
2834 | "LLW: waitpid %ld received %s\n", | |
2835 | (long) lwpid, status_to_str (status)); | |
2836 | } | |
2837 | ||
02f3fc28 | 2838 | lp = linux_nat_filter_event (lwpid, status, options); |
d90e17a7 PA |
2839 | |
2840 | if (lp | |
2841 | && ptid_is_pid (ptid) | |
2842 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 2843 | { |
d90e17a7 PA |
2844 | if (debug_linux_nat) |
2845 | fprintf (stderr, "LWP %ld got an event %06x, leaving pending.\n", | |
2846 | ptid_get_lwp (lp->ptid), status); | |
2847 | ||
2848 | if (WIFSTOPPED (status)) | |
2849 | { | |
2850 | if (WSTOPSIG (status) != SIGSTOP) | |
2851 | { | |
2852 | lp->status = status; | |
2853 | ||
2854 | stop_callback (lp, NULL); | |
2855 | ||
2856 | /* Resume in order to collect the sigstop. */ | |
2857 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2858 | ||
2859 | stop_wait_callback (lp, NULL); | |
2860 | } | |
2861 | else | |
2862 | { | |
2863 | lp->stopped = 1; | |
2864 | lp->signalled = 0; | |
2865 | } | |
2866 | } | |
2867 | else if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2868 | { | |
2869 | if (debug_linux_nat) | |
2870 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
2871 | ptid_get_lwp (lp->ptid)); | |
2872 | ||
2873 | /* This was the last lwp in the process. Since | |
2874 | events are serialized to GDB core, and we can't | |
2875 | report this one right now, but GDB core and the | |
2876 | other target layers will want to be notified | |
2877 | about the exit code/signal, leave the status | |
2878 | pending for the next time we're able to report | |
2879 | it. */ | |
2880 | lp->status = status; | |
2881 | ||
2882 | /* Prevent trying to stop this thread again. We'll | |
2883 | never try to resume it because it has a pending | |
2884 | status. */ | |
2885 | lp->stopped = 1; | |
2886 | ||
2887 | /* Dead LWP's aren't expected to reported a pending | |
2888 | sigstop. */ | |
2889 | lp->signalled = 0; | |
2890 | ||
2891 | /* Store the pending event in the waitstatus as | |
2892 | well, because W_EXITCODE(0,0) == 0. */ | |
2893 | store_waitstatus (&lp->waitstatus, status); | |
2894 | } | |
2895 | ||
2896 | /* Keep looking. */ | |
2897 | lp = NULL; | |
d6b0e80f AC |
2898 | continue; |
2899 | } | |
2900 | ||
d90e17a7 PA |
2901 | if (lp) |
2902 | break; | |
2903 | else | |
2904 | { | |
2905 | if (pid == -1) | |
2906 | { | |
2907 | /* waitpid did return something. Restart over. */ | |
2908 | options |= __WCLONE; | |
2909 | } | |
2910 | continue; | |
2911 | } | |
d6b0e80f AC |
2912 | } |
2913 | ||
2914 | if (pid == -1) | |
2915 | { | |
2916 | /* Alternate between checking cloned and uncloned processes. */ | |
2917 | options ^= __WCLONE; | |
2918 | ||
b84876c2 PA |
2919 | /* And every time we have checked both: |
2920 | In async mode, return to event loop; | |
2921 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 2922 | if (options & __WCLONE) |
b84876c2 | 2923 | { |
47608cb1 | 2924 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
2925 | { |
2926 | /* No interesting event. */ | |
2927 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2928 | ||
b84876c2 PA |
2929 | if (debug_linux_nat_async) |
2930 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
2931 | ||
7feb7d06 | 2932 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
2933 | return minus_one_ptid; |
2934 | } | |
2935 | ||
2936 | sigsuspend (&suspend_mask); | |
2937 | } | |
d6b0e80f AC |
2938 | } |
2939 | ||
2940 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 2941 | gdb_assert (lp == NULL); |
d6b0e80f AC |
2942 | } |
2943 | ||
b84876c2 | 2944 | if (!target_can_async_p ()) |
d26b5354 | 2945 | clear_sigint_trap (); |
d6b0e80f AC |
2946 | |
2947 | gdb_assert (lp); | |
2948 | ||
2949 | /* Don't report signals that GDB isn't interested in, such as | |
2950 | signals that are neither printed nor stopped upon. Stopping all | |
2951 | threads can be a bit time-consuming so if we want decent | |
2952 | performance with heavily multi-threaded programs, especially when | |
2953 | they're using a high frequency timer, we'd better avoid it if we | |
2954 | can. */ | |
2955 | ||
2956 | if (WIFSTOPPED (status)) | |
2957 | { | |
2958 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
d6b48e9c PA |
2959 | struct inferior *inf; |
2960 | ||
2961 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
2962 | gdb_assert (inf); | |
d6b0e80f | 2963 | |
d6b48e9c PA |
2964 | /* Defer to common code if we get a signal while |
2965 | single-stepping, since that may need special care, e.g. to | |
2966 | skip the signal handler, or, if we're gaining control of the | |
2967 | inferior. */ | |
d539ed7e | 2968 | if (!lp->step |
d6b48e9c | 2969 | && inf->stop_soon == NO_STOP_QUIETLY |
d539ed7e | 2970 | && signal_stop_state (signo) == 0 |
d6b0e80f AC |
2971 | && signal_print_state (signo) == 0 |
2972 | && signal_pass_state (signo) == 1) | |
2973 | { | |
2974 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
2975 | here? It is not clear we should. GDB may not expect | |
2976 | other threads to run. On the other hand, not resuming | |
2977 | newly attached threads may cause an unwanted delay in | |
2978 | getting them running. */ | |
2979 | registers_changed (); | |
28439f5e | 2980 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 2981 | lp->step, signo); |
d6b0e80f AC |
2982 | if (debug_linux_nat) |
2983 | fprintf_unfiltered (gdb_stdlog, | |
2984 | "LLW: %s %s, %s (preempt 'handle')\n", | |
2985 | lp->step ? | |
2986 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2987 | target_pid_to_str (lp->ptid), | |
2988 | signo ? strsignal (signo) : "0"); | |
2989 | lp->stopped = 0; | |
d6b0e80f AC |
2990 | goto retry; |
2991 | } | |
2992 | ||
1ad15515 | 2993 | if (!non_stop) |
d6b0e80f | 2994 | { |
1ad15515 PA |
2995 | /* Only do the below in all-stop, as we currently use SIGINT |
2996 | to implement target_stop (see linux_nat_stop) in | |
2997 | non-stop. */ | |
2998 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
2999 | { | |
3000 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3001 | forwarded to the entire process group, that is, all LWPs | |
3002 | will receive it - unless they're using CLONE_THREAD to | |
3003 | share signals. Since we only want to report it once, we | |
3004 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3005 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3006 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3007 | lp->ignore_sigint = 0; |
3008 | } | |
3009 | else | |
3010 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3011 | } |
3012 | } | |
3013 | ||
3014 | /* This LWP is stopped now. */ | |
3015 | lp->stopped = 1; | |
3016 | ||
3017 | if (debug_linux_nat) | |
3018 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3019 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3020 | ||
4c28f408 PA |
3021 | if (!non_stop) |
3022 | { | |
3023 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3024 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3025 | |
3026 | /* ... and wait until all of them have reported back that | |
3027 | they're no longer running. */ | |
d90e17a7 | 3028 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3029 | |
3030 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3031 | from among those that have had events. Giving equal priority | |
3032 | to all LWPs that have had events helps prevent | |
3033 | starvation. */ | |
3034 | if (pid == -1) | |
d90e17a7 | 3035 | select_event_lwp (ptid, &lp, &status); |
4c28f408 | 3036 | } |
d6b0e80f AC |
3037 | |
3038 | /* Now that we've selected our final event LWP, cancel any | |
3039 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
3040 | the comment in cancel_breakpoints_callback to find out why. */ | |
d90e17a7 | 3041 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); |
d6b0e80f | 3042 | |
d6b0e80f AC |
3043 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) |
3044 | { | |
d6b0e80f AC |
3045 | if (debug_linux_nat) |
3046 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3047 | "LLW: trap ptid is %s.\n", |
3048 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3049 | } |
d6b0e80f AC |
3050 | |
3051 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3052 | { | |
3053 | *ourstatus = lp->waitstatus; | |
3054 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3055 | } | |
3056 | else | |
3057 | store_waitstatus (ourstatus, status); | |
3058 | ||
b84876c2 PA |
3059 | if (debug_linux_nat_async) |
3060 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); | |
3061 | ||
7feb7d06 | 3062 | restore_child_signals_mask (&prev_mask); |
f973ed9c | 3063 | return lp->ptid; |
d6b0e80f AC |
3064 | } |
3065 | ||
7feb7d06 PA |
3066 | static ptid_t |
3067 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3068 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3069 | int target_options) | |
7feb7d06 PA |
3070 | { |
3071 | ptid_t event_ptid; | |
3072 | ||
3073 | if (debug_linux_nat) | |
3074 | fprintf_unfiltered (gdb_stdlog, "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
3075 | ||
3076 | /* Flush the async file first. */ | |
3077 | if (target_can_async_p ()) | |
3078 | async_file_flush (); | |
3079 | ||
47608cb1 | 3080 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3081 | |
3082 | /* If we requested any event, and something came out, assume there | |
3083 | may be more. If we requested a specific lwp or process, also | |
3084 | assume there may be more. */ | |
3085 | if (target_can_async_p () | |
3086 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3087 | || !ptid_equal (ptid, minus_one_ptid))) | |
3088 | async_file_mark (); | |
3089 | ||
3090 | /* Get ready for the next event. */ | |
3091 | if (target_can_async_p ()) | |
3092 | target_async (inferior_event_handler, 0); | |
3093 | ||
3094 | return event_ptid; | |
3095 | } | |
3096 | ||
d6b0e80f AC |
3097 | static int |
3098 | kill_callback (struct lwp_info *lp, void *data) | |
3099 | { | |
3100 | errno = 0; | |
3101 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3102 | if (debug_linux_nat) | |
3103 | fprintf_unfiltered (gdb_stdlog, | |
3104 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3105 | target_pid_to_str (lp->ptid), | |
3106 | errno ? safe_strerror (errno) : "OK"); | |
3107 | ||
3108 | return 0; | |
3109 | } | |
3110 | ||
3111 | static int | |
3112 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3113 | { | |
3114 | pid_t pid; | |
3115 | ||
3116 | /* We must make sure that there are no pending events (delayed | |
3117 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3118 | program doesn't interfere with any following debugging session. */ | |
3119 | ||
3120 | /* For cloned processes we must check both with __WCLONE and | |
3121 | without, since the exit status of a cloned process isn't reported | |
3122 | with __WCLONE. */ | |
3123 | if (lp->cloned) | |
3124 | { | |
3125 | do | |
3126 | { | |
58aecb61 | 3127 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3128 | if (pid != (pid_t) -1) |
d6b0e80f | 3129 | { |
e85a822c DJ |
3130 | if (debug_linux_nat) |
3131 | fprintf_unfiltered (gdb_stdlog, | |
3132 | "KWC: wait %s received unknown.\n", | |
3133 | target_pid_to_str (lp->ptid)); | |
3134 | /* The Linux kernel sometimes fails to kill a thread | |
3135 | completely after PTRACE_KILL; that goes from the stop | |
3136 | point in do_fork out to the one in | |
3137 | get_signal_to_deliever and waits again. So kill it | |
3138 | again. */ | |
3139 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3140 | } |
3141 | } | |
3142 | while (pid == GET_LWP (lp->ptid)); | |
3143 | ||
3144 | gdb_assert (pid == -1 && errno == ECHILD); | |
3145 | } | |
3146 | ||
3147 | do | |
3148 | { | |
58aecb61 | 3149 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3150 | if (pid != (pid_t) -1) |
d6b0e80f | 3151 | { |
e85a822c DJ |
3152 | if (debug_linux_nat) |
3153 | fprintf_unfiltered (gdb_stdlog, | |
3154 | "KWC: wait %s received unk.\n", | |
3155 | target_pid_to_str (lp->ptid)); | |
3156 | /* See the call to kill_callback above. */ | |
3157 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3158 | } |
3159 | } | |
3160 | while (pid == GET_LWP (lp->ptid)); | |
3161 | ||
3162 | gdb_assert (pid == -1 && errno == ECHILD); | |
3163 | return 0; | |
3164 | } | |
3165 | ||
3166 | static void | |
7d85a9c0 | 3167 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3168 | { |
f973ed9c DJ |
3169 | struct target_waitstatus last; |
3170 | ptid_t last_ptid; | |
3171 | int status; | |
d6b0e80f | 3172 | |
f973ed9c DJ |
3173 | /* If we're stopped while forking and we haven't followed yet, |
3174 | kill the other task. We need to do this first because the | |
3175 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3176 | |
f973ed9c | 3177 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3178 | |
f973ed9c DJ |
3179 | if (last.kind == TARGET_WAITKIND_FORKED |
3180 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3181 | { | |
3a3e9ee3 | 3182 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3183 | wait (&status); |
3184 | } | |
3185 | ||
3186 | if (forks_exist_p ()) | |
7feb7d06 | 3187 | linux_fork_killall (); |
f973ed9c DJ |
3188 | else |
3189 | { | |
d90e17a7 | 3190 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
4c28f408 PA |
3191 | /* Stop all threads before killing them, since ptrace requires |
3192 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3193 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3194 | /* ... and wait until all of them have reported back that |
3195 | they're no longer running. */ | |
d90e17a7 | 3196 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3197 | |
f973ed9c | 3198 | /* Kill all LWP's ... */ |
d90e17a7 | 3199 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3200 | |
3201 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3202 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3203 | } |
3204 | ||
3205 | target_mourn_inferior (); | |
d6b0e80f AC |
3206 | } |
3207 | ||
3208 | static void | |
136d6dae | 3209 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3210 | { |
d90e17a7 | 3211 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 3212 | |
f973ed9c | 3213 | if (! forks_exist_p ()) |
d90e17a7 PA |
3214 | /* Normal case, no other forks available. */ |
3215 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3216 | else |
3217 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3218 | there are other viable forks to debug. Delete the exiting | |
3219 | one and context-switch to the first available. */ | |
3220 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3221 | } |
3222 | ||
5b009018 PA |
3223 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3224 | layout of the inferiors' architecture. */ | |
3225 | ||
3226 | static void | |
3227 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
3228 | { | |
3229 | int done = 0; | |
3230 | ||
3231 | if (linux_nat_siginfo_fixup != NULL) | |
3232 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3233 | ||
3234 | /* If there was no callback, or the callback didn't do anything, | |
3235 | then just do a straight memcpy. */ | |
3236 | if (!done) | |
3237 | { | |
3238 | if (direction == 1) | |
3239 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3240 | else | |
3241 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3242 | } | |
3243 | } | |
3244 | ||
4aa995e1 PA |
3245 | static LONGEST |
3246 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
3247 | const char *annex, gdb_byte *readbuf, | |
3248 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3249 | { | |
4aa995e1 PA |
3250 | int pid; |
3251 | struct siginfo siginfo; | |
5b009018 | 3252 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3253 | |
3254 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3255 | gdb_assert (readbuf || writebuf); | |
3256 | ||
3257 | pid = GET_LWP (inferior_ptid); | |
3258 | if (pid == 0) | |
3259 | pid = GET_PID (inferior_ptid); | |
3260 | ||
3261 | if (offset > sizeof (siginfo)) | |
3262 | return -1; | |
3263 | ||
3264 | errno = 0; | |
3265 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3266 | if (errno != 0) | |
3267 | return -1; | |
3268 | ||
5b009018 PA |
3269 | /* When GDB is built as a 64-bit application, ptrace writes into |
3270 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3271 | inferior with a 64-bit GDB should look the same as debugging it | |
3272 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3273 | the converted layout, so any read/write will have to be done | |
3274 | post-conversion. */ | |
3275 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3276 | ||
4aa995e1 PA |
3277 | if (offset + len > sizeof (siginfo)) |
3278 | len = sizeof (siginfo) - offset; | |
3279 | ||
3280 | if (readbuf != NULL) | |
5b009018 | 3281 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3282 | else |
3283 | { | |
5b009018 PA |
3284 | memcpy (inf_siginfo + offset, writebuf, len); |
3285 | ||
3286 | /* Convert back to ptrace layout before flushing it out. */ | |
3287 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3288 | ||
4aa995e1 PA |
3289 | errno = 0; |
3290 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3291 | if (errno != 0) | |
3292 | return -1; | |
3293 | } | |
3294 | ||
3295 | return len; | |
3296 | } | |
3297 | ||
10d6c8cd DJ |
3298 | static LONGEST |
3299 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
3300 | const char *annex, gdb_byte *readbuf, | |
3301 | const gdb_byte *writebuf, | |
3302 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 3303 | { |
4aa995e1 | 3304 | struct cleanup *old_chain; |
10d6c8cd | 3305 | LONGEST xfer; |
d6b0e80f | 3306 | |
4aa995e1 PA |
3307 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3308 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
3309 | offset, len); | |
3310 | ||
3311 | old_chain = save_inferior_ptid (); | |
3312 | ||
d6b0e80f AC |
3313 | if (is_lwp (inferior_ptid)) |
3314 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
3315 | ||
10d6c8cd DJ |
3316 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
3317 | offset, len); | |
d6b0e80f AC |
3318 | |
3319 | do_cleanups (old_chain); | |
3320 | return xfer; | |
3321 | } | |
3322 | ||
3323 | static int | |
28439f5e | 3324 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 3325 | { |
4c28f408 PA |
3326 | int err; |
3327 | ||
d6b0e80f AC |
3328 | gdb_assert (is_lwp (ptid)); |
3329 | ||
4c28f408 PA |
3330 | /* Send signal 0 instead of anything ptrace, because ptracing a |
3331 | running thread errors out claiming that the thread doesn't | |
3332 | exist. */ | |
3333 | err = kill_lwp (GET_LWP (ptid), 0); | |
3334 | ||
d6b0e80f AC |
3335 | if (debug_linux_nat) |
3336 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 3337 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 3338 | target_pid_to_str (ptid), |
4c28f408 | 3339 | err ? safe_strerror (err) : "OK"); |
9c0dd46b | 3340 | |
4c28f408 | 3341 | if (err != 0) |
d6b0e80f AC |
3342 | return 0; |
3343 | ||
3344 | return 1; | |
3345 | } | |
3346 | ||
28439f5e PA |
3347 | static int |
3348 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
3349 | { | |
3350 | return linux_thread_alive (ptid); | |
3351 | } | |
3352 | ||
d6b0e80f | 3353 | static char * |
117de6a9 | 3354 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
3355 | { |
3356 | static char buf[64]; | |
3357 | ||
a0ef4274 | 3358 | if (is_lwp (ptid) |
d90e17a7 PA |
3359 | && (GET_PID (ptid) != GET_LWP (ptid) |
3360 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
3361 | { |
3362 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
3363 | return buf; | |
3364 | } | |
3365 | ||
3366 | return normal_pid_to_str (ptid); | |
3367 | } | |
3368 | ||
dba24537 AC |
3369 | /* Accepts an integer PID; Returns a string representing a file that |
3370 | can be opened to get the symbols for the child process. */ | |
3371 | ||
6d8fd2b7 UW |
3372 | static char * |
3373 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
3374 | { |
3375 | char *name1, *name2; | |
3376 | ||
3377 | name1 = xmalloc (MAXPATHLEN); | |
3378 | name2 = xmalloc (MAXPATHLEN); | |
3379 | make_cleanup (xfree, name1); | |
3380 | make_cleanup (xfree, name2); | |
3381 | memset (name2, 0, MAXPATHLEN); | |
3382 | ||
3383 | sprintf (name1, "/proc/%d/exe", pid); | |
3384 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
3385 | return name2; | |
3386 | else | |
3387 | return name1; | |
3388 | } | |
3389 | ||
3390 | /* Service function for corefiles and info proc. */ | |
3391 | ||
3392 | static int | |
3393 | read_mapping (FILE *mapfile, | |
3394 | long long *addr, | |
3395 | long long *endaddr, | |
3396 | char *permissions, | |
3397 | long long *offset, | |
3398 | char *device, long long *inode, char *filename) | |
3399 | { | |
3400 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
3401 | addr, endaddr, permissions, offset, device, inode); | |
3402 | ||
2e14c2ea MS |
3403 | filename[0] = '\0'; |
3404 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
3405 | { |
3406 | /* Eat everything up to EOL for the filename. This will prevent | |
3407 | weird filenames (such as one with embedded whitespace) from | |
3408 | confusing this code. It also makes this code more robust in | |
3409 | respect to annotations the kernel may add after the filename. | |
3410 | ||
3411 | Note the filename is used for informational purposes | |
3412 | only. */ | |
3413 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
3414 | } | |
2e14c2ea | 3415 | |
dba24537 AC |
3416 | return (ret != 0 && ret != EOF); |
3417 | } | |
3418 | ||
3419 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
3420 | regions in the inferior for a corefile. */ | |
3421 | ||
3422 | static int | |
3423 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
3424 | unsigned long, | |
3425 | int, int, int, void *), void *obfd) | |
3426 | { | |
89ecc4f5 | 3427 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
3428 | char mapsfilename[MAXPATHLEN]; |
3429 | FILE *mapsfile; | |
3430 | long long addr, endaddr, size, offset, inode; | |
3431 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
3432 | int read, write, exec; | |
3433 | int ret; | |
7c8a8b04 | 3434 | struct cleanup *cleanup; |
dba24537 AC |
3435 | |
3436 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 3437 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 3438 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 3439 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 3440 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
3441 | |
3442 | if (info_verbose) | |
3443 | fprintf_filtered (gdb_stdout, | |
3444 | "Reading memory regions from %s\n", mapsfilename); | |
3445 | ||
3446 | /* Now iterate until end-of-file. */ | |
3447 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
3448 | &offset, &device[0], &inode, &filename[0])) | |
3449 | { | |
3450 | size = endaddr - addr; | |
3451 | ||
3452 | /* Get the segment's permissions. */ | |
3453 | read = (strchr (permissions, 'r') != 0); | |
3454 | write = (strchr (permissions, 'w') != 0); | |
3455 | exec = (strchr (permissions, 'x') != 0); | |
3456 | ||
3457 | if (info_verbose) | |
3458 | { | |
3459 | fprintf_filtered (gdb_stdout, | |
3460 | "Save segment, %lld bytes at 0x%s (%c%c%c)", | |
3461 | size, paddr_nz (addr), | |
3462 | read ? 'r' : ' ', | |
3463 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 3464 | if (filename[0]) |
dba24537 AC |
3465 | fprintf_filtered (gdb_stdout, " for %s", filename); |
3466 | fprintf_filtered (gdb_stdout, "\n"); | |
3467 | } | |
3468 | ||
3469 | /* Invoke the callback function to create the corefile | |
3470 | segment. */ | |
3471 | func (addr, size, read, write, exec, obfd); | |
3472 | } | |
7c8a8b04 | 3473 | do_cleanups (cleanup); |
dba24537 AC |
3474 | return 0; |
3475 | } | |
3476 | ||
2020b7ab PA |
3477 | static int |
3478 | find_signalled_thread (struct thread_info *info, void *data) | |
3479 | { | |
3480 | if (info->stop_signal != TARGET_SIGNAL_0 | |
3481 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) | |
3482 | return 1; | |
3483 | ||
3484 | return 0; | |
3485 | } | |
3486 | ||
3487 | static enum target_signal | |
3488 | find_stop_signal (void) | |
3489 | { | |
3490 | struct thread_info *info = | |
3491 | iterate_over_threads (find_signalled_thread, NULL); | |
3492 | ||
3493 | if (info) | |
3494 | return info->stop_signal; | |
3495 | else | |
3496 | return TARGET_SIGNAL_0; | |
3497 | } | |
3498 | ||
dba24537 AC |
3499 | /* Records the thread's register state for the corefile note |
3500 | section. */ | |
3501 | ||
3502 | static char * | |
3503 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
3504 | char *note_data, int *note_size, |
3505 | enum target_signal stop_signal) | |
dba24537 AC |
3506 | { |
3507 | gdb_gregset_t gregs; | |
3508 | gdb_fpregset_t fpregs; | |
dba24537 | 3509 | unsigned long lwp = ptid_get_lwp (ptid); |
594f7785 UW |
3510 | struct regcache *regcache = get_thread_regcache (ptid); |
3511 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4f844a66 | 3512 | const struct regset *regset; |
55e969c1 | 3513 | int core_regset_p; |
594f7785 | 3514 | struct cleanup *old_chain; |
17ea7499 CES |
3515 | struct core_regset_section *sect_list; |
3516 | char *gdb_regset; | |
594f7785 UW |
3517 | |
3518 | old_chain = save_inferior_ptid (); | |
3519 | inferior_ptid = ptid; | |
3520 | target_fetch_registers (regcache, -1); | |
3521 | do_cleanups (old_chain); | |
4f844a66 DM |
3522 | |
3523 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
3524 | sect_list = gdbarch_core_regset_sections (gdbarch); |
3525 | ||
55e969c1 DM |
3526 | if (core_regset_p |
3527 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3528 | sizeof (gregs))) != NULL | |
3529 | && regset->collect_regset != NULL) | |
594f7785 | 3530 | regset->collect_regset (regset, regcache, -1, |
55e969c1 | 3531 | &gregs, sizeof (gregs)); |
4f844a66 | 3532 | else |
594f7785 | 3533 | fill_gregset (regcache, &gregs, -1); |
4f844a66 | 3534 | |
55e969c1 DM |
3535 | note_data = (char *) elfcore_write_prstatus (obfd, |
3536 | note_data, | |
3537 | note_size, | |
3538 | lwp, | |
3539 | stop_signal, &gregs); | |
3540 | ||
17ea7499 CES |
3541 | /* The loop below uses the new struct core_regset_section, which stores |
3542 | the supported section names and sizes for the core file. Note that | |
3543 | note PRSTATUS needs to be treated specially. But the other notes are | |
3544 | structurally the same, so they can benefit from the new struct. */ | |
3545 | if (core_regset_p && sect_list != NULL) | |
3546 | while (sect_list->sect_name != NULL) | |
3547 | { | |
3548 | /* .reg was already handled above. */ | |
3549 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
3550 | { | |
3551 | sect_list++; | |
3552 | continue; | |
3553 | } | |
3554 | regset = gdbarch_regset_from_core_section (gdbarch, | |
3555 | sect_list->sect_name, | |
3556 | sect_list->size); | |
3557 | gdb_assert (regset && regset->collect_regset); | |
3558 | gdb_regset = xmalloc (sect_list->size); | |
3559 | regset->collect_regset (regset, regcache, -1, | |
3560 | gdb_regset, sect_list->size); | |
3561 | note_data = (char *) elfcore_write_register_note (obfd, | |
3562 | note_data, | |
3563 | note_size, | |
3564 | sect_list->sect_name, | |
3565 | gdb_regset, | |
3566 | sect_list->size); | |
3567 | xfree (gdb_regset); | |
3568 | sect_list++; | |
3569 | } | |
dba24537 | 3570 | |
17ea7499 CES |
3571 | /* For architectures that does not have the struct core_regset_section |
3572 | implemented, we use the old method. When all the architectures have | |
3573 | the new support, the code below should be deleted. */ | |
4f844a66 | 3574 | else |
17ea7499 CES |
3575 | { |
3576 | if (core_regset_p | |
3577 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3578 | sizeof (fpregs))) != NULL | |
3579 | && regset->collect_regset != NULL) | |
3580 | regset->collect_regset (regset, regcache, -1, | |
3581 | &fpregs, sizeof (fpregs)); | |
3582 | else | |
3583 | fill_fpregset (regcache, &fpregs, -1); | |
3584 | ||
3585 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
3586 | note_data, | |
3587 | note_size, | |
3588 | &fpregs, sizeof (fpregs)); | |
3589 | } | |
4f844a66 | 3590 | |
dba24537 AC |
3591 | return note_data; |
3592 | } | |
3593 | ||
3594 | struct linux_nat_corefile_thread_data | |
3595 | { | |
3596 | bfd *obfd; | |
3597 | char *note_data; | |
3598 | int *note_size; | |
3599 | int num_notes; | |
2020b7ab | 3600 | enum target_signal stop_signal; |
dba24537 AC |
3601 | }; |
3602 | ||
3603 | /* Called by gdbthread.c once per thread. Records the thread's | |
3604 | register state for the corefile note section. */ | |
3605 | ||
3606 | static int | |
3607 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
3608 | { | |
3609 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 3610 | |
dba24537 AC |
3611 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
3612 | ti->ptid, | |
3613 | args->note_data, | |
2020b7ab PA |
3614 | args->note_size, |
3615 | args->stop_signal); | |
dba24537 | 3616 | args->num_notes++; |
56be3814 | 3617 | |
dba24537 AC |
3618 | return 0; |
3619 | } | |
3620 | ||
dba24537 AC |
3621 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
3622 | section for a corefile, and returns it in a malloc buffer. */ | |
3623 | ||
3624 | static char * | |
3625 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
3626 | { | |
3627 | struct linux_nat_corefile_thread_data thread_args; | |
3628 | struct cleanup *old_chain; | |
d99148ef | 3629 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 3630 | char fname[16] = { '\0' }; |
d99148ef | 3631 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
3632 | char psargs[80] = { '\0' }; |
3633 | char *note_data = NULL; | |
3634 | ptid_t current_ptid = inferior_ptid; | |
d90e17a7 | 3635 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 3636 | gdb_byte *auxv; |
dba24537 AC |
3637 | int auxv_len; |
3638 | ||
3639 | if (get_exec_file (0)) | |
3640 | { | |
3641 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
3642 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
3643 | if (get_inferior_args ()) | |
3644 | { | |
d99148ef JK |
3645 | char *string_end; |
3646 | char *psargs_end = psargs + sizeof (psargs); | |
3647 | ||
3648 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
3649 | strings fine. */ | |
3650 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
3651 | if (string_end != NULL) | |
3652 | { | |
3653 | *string_end++ = ' '; | |
3654 | strncpy (string_end, get_inferior_args (), | |
3655 | psargs_end - string_end); | |
3656 | } | |
dba24537 AC |
3657 | } |
3658 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
3659 | note_data, | |
3660 | note_size, fname, psargs); | |
3661 | } | |
3662 | ||
3663 | /* Dump information for threads. */ | |
3664 | thread_args.obfd = obfd; | |
3665 | thread_args.note_data = note_data; | |
3666 | thread_args.note_size = note_size; | |
3667 | thread_args.num_notes = 0; | |
2020b7ab | 3668 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 3669 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
3670 | gdb_assert (thread_args.num_notes != 0); |
3671 | note_data = thread_args.note_data; | |
dba24537 | 3672 | |
13547ab6 DJ |
3673 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
3674 | NULL, &auxv); | |
dba24537 AC |
3675 | if (auxv_len > 0) |
3676 | { | |
3677 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
3678 | "CORE", NT_AUXV, auxv, auxv_len); | |
3679 | xfree (auxv); | |
3680 | } | |
3681 | ||
3682 | make_cleanup (xfree, note_data); | |
3683 | return note_data; | |
3684 | } | |
3685 | ||
3686 | /* Implement the "info proc" command. */ | |
3687 | ||
3688 | static void | |
3689 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
3690 | { | |
89ecc4f5 DE |
3691 | /* A long is used for pid instead of an int to avoid a loss of precision |
3692 | compiler warning from the output of strtoul. */ | |
3693 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
3694 | FILE *procfile; |
3695 | char **argv = NULL; | |
3696 | char buffer[MAXPATHLEN]; | |
3697 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
3698 | int cmdline_f = 1; | |
3699 | int cwd_f = 1; | |
3700 | int exe_f = 1; | |
3701 | int mappings_f = 0; | |
3702 | int environ_f = 0; | |
3703 | int status_f = 0; | |
3704 | int stat_f = 0; | |
3705 | int all = 0; | |
3706 | struct stat dummy; | |
3707 | ||
3708 | if (args) | |
3709 | { | |
3710 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
3711 | argv = gdb_buildargv (args); |
3712 | make_cleanup_freeargv (argv); | |
dba24537 AC |
3713 | } |
3714 | while (argv != NULL && *argv != NULL) | |
3715 | { | |
3716 | if (isdigit (argv[0][0])) | |
3717 | { | |
3718 | pid = strtoul (argv[0], NULL, 10); | |
3719 | } | |
3720 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
3721 | { | |
3722 | mappings_f = 1; | |
3723 | } | |
3724 | else if (strcmp (argv[0], "status") == 0) | |
3725 | { | |
3726 | status_f = 1; | |
3727 | } | |
3728 | else if (strcmp (argv[0], "stat") == 0) | |
3729 | { | |
3730 | stat_f = 1; | |
3731 | } | |
3732 | else if (strcmp (argv[0], "cmd") == 0) | |
3733 | { | |
3734 | cmdline_f = 1; | |
3735 | } | |
3736 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
3737 | { | |
3738 | exe_f = 1; | |
3739 | } | |
3740 | else if (strcmp (argv[0], "cwd") == 0) | |
3741 | { | |
3742 | cwd_f = 1; | |
3743 | } | |
3744 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
3745 | { | |
3746 | all = 1; | |
3747 | } | |
3748 | else | |
3749 | { | |
3750 | /* [...] (future options here) */ | |
3751 | } | |
3752 | argv++; | |
3753 | } | |
3754 | if (pid == 0) | |
8a3fe4f8 | 3755 | error (_("No current process: you must name one.")); |
dba24537 | 3756 | |
89ecc4f5 | 3757 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 3758 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 3759 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 3760 | |
89ecc4f5 | 3761 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
3762 | if (cmdline_f || all) |
3763 | { | |
89ecc4f5 | 3764 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 3765 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 3766 | { |
7c8a8b04 | 3767 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
bf1d7d9c JB |
3768 | if (fgets (buffer, sizeof (buffer), procfile)) |
3769 | printf_filtered ("cmdline = '%s'\n", buffer); | |
3770 | else | |
3771 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 3772 | do_cleanups (cleanup); |
dba24537 AC |
3773 | } |
3774 | else | |
8a3fe4f8 | 3775 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3776 | } |
3777 | if (cwd_f || all) | |
3778 | { | |
89ecc4f5 | 3779 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
3780 | memset (fname2, 0, sizeof (fname2)); |
3781 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
3782 | printf_filtered ("cwd = '%s'\n", fname2); | |
3783 | else | |
8a3fe4f8 | 3784 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
3785 | } |
3786 | if (exe_f || all) | |
3787 | { | |
89ecc4f5 | 3788 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
3789 | memset (fname2, 0, sizeof (fname2)); |
3790 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
3791 | printf_filtered ("exe = '%s'\n", fname2); | |
3792 | else | |
8a3fe4f8 | 3793 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
3794 | } |
3795 | if (mappings_f || all) | |
3796 | { | |
89ecc4f5 | 3797 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 3798 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
3799 | { |
3800 | long long addr, endaddr, size, offset, inode; | |
3801 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 3802 | struct cleanup *cleanup; |
dba24537 | 3803 | |
7c8a8b04 | 3804 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 3805 | printf_filtered (_("Mapped address spaces:\n\n")); |
17a912b6 | 3806 | if (gdbarch_addr_bit (current_gdbarch) == 32) |
dba24537 AC |
3807 | { |
3808 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
3809 | "Start Addr", | |
3810 | " End Addr", | |
3811 | " Size", " Offset", "objfile"); | |
3812 | } | |
3813 | else | |
3814 | { | |
3815 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
3816 | "Start Addr", | |
3817 | " End Addr", | |
3818 | " Size", " Offset", "objfile"); | |
3819 | } | |
3820 | ||
3821 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
3822 | &offset, &device[0], &inode, &filename[0])) | |
3823 | { | |
3824 | size = endaddr - addr; | |
3825 | ||
3826 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
3827 | calls here (and possibly above) should be abstracted | |
3828 | out into their own functions? Andrew suggests using | |
3829 | a generic local_address_string instead to print out | |
3830 | the addresses; that makes sense to me, too. */ | |
3831 | ||
17a912b6 | 3832 | if (gdbarch_addr_bit (current_gdbarch) == 32) |
dba24537 AC |
3833 | { |
3834 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
3835 | (unsigned long) addr, /* FIXME: pr_addr */ | |
3836 | (unsigned long) endaddr, | |
3837 | (int) size, | |
3838 | (unsigned int) offset, | |
3839 | filename[0] ? filename : ""); | |
3840 | } | |
3841 | else | |
3842 | { | |
3843 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
3844 | (unsigned long) addr, /* FIXME: pr_addr */ | |
3845 | (unsigned long) endaddr, | |
3846 | (int) size, | |
3847 | (unsigned int) offset, | |
3848 | filename[0] ? filename : ""); | |
3849 | } | |
3850 | } | |
3851 | ||
7c8a8b04 | 3852 | do_cleanups (cleanup); |
dba24537 AC |
3853 | } |
3854 | else | |
8a3fe4f8 | 3855 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3856 | } |
3857 | if (status_f || all) | |
3858 | { | |
89ecc4f5 | 3859 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 3860 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 3861 | { |
7c8a8b04 | 3862 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
3863 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
3864 | puts_filtered (buffer); | |
7c8a8b04 | 3865 | do_cleanups (cleanup); |
dba24537 AC |
3866 | } |
3867 | else | |
8a3fe4f8 | 3868 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3869 | } |
3870 | if (stat_f || all) | |
3871 | { | |
89ecc4f5 | 3872 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 3873 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
3874 | { |
3875 | int itmp; | |
3876 | char ctmp; | |
a25694b4 | 3877 | long ltmp; |
7c8a8b04 | 3878 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
3879 | |
3880 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 3881 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 3882 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 3883 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 3884 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 3885 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 3886 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3887 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 3888 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3889 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 3890 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3891 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 3892 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3893 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 3894 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3895 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
3896 | if (fscanf (procfile, "%lu ", <mp) > 0) |
3897 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
3898 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3899 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
3900 | (unsigned long) ltmp); | |
3901 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3902 | printf_filtered (_("Minor faults, children: %lu\n"), | |
3903 | (unsigned long) ltmp); | |
3904 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3905 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
3906 | (unsigned long) ltmp); | |
3907 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3908 | printf_filtered (_("Major faults, children: %lu\n"), | |
3909 | (unsigned long) ltmp); | |
3910 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3911 | printf_filtered (_("utime: %ld\n"), ltmp); | |
3912 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3913 | printf_filtered (_("stime: %ld\n"), ltmp); | |
3914 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3915 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
3916 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3917 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
3918 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3919 | printf_filtered (_("jiffies remaining in current time slice: %ld\n"), | |
3920 | ltmp); | |
3921 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3922 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
3923 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3924 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
3925 | (unsigned long) ltmp); | |
3926 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3927 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
3928 | (unsigned long) ltmp); | |
3929 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3930 | printf_filtered (_("start time (jiffies since system boot): %ld\n"), | |
3931 | ltmp); | |
3932 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3933 | printf_filtered (_("Virtual memory size: %lu\n"), | |
3934 | (unsigned long) ltmp); | |
3935 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3936 | printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp); | |
3937 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3938 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
3939 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3940 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
3941 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3942 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
3943 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3944 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
dba24537 AC |
3945 | #if 0 /* Don't know how architecture-dependent the rest is... |
3946 | Anyway the signal bitmap info is available from "status". */ | |
a25694b4 AS |
3947 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
3948 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); | |
3949 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
3950 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); | |
3951 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3952 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
3953 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3954 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
3955 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3956 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
3957 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3958 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
3959 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
3960 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); | |
dba24537 | 3961 | #endif |
7c8a8b04 | 3962 | do_cleanups (cleanup); |
dba24537 AC |
3963 | } |
3964 | else | |
8a3fe4f8 | 3965 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3966 | } |
3967 | } | |
3968 | ||
10d6c8cd DJ |
3969 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
3970 | filesystem. Because we can use a single read() call for /proc, this | |
3971 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
3972 | but it doesn't support writes. */ | |
3973 | ||
3974 | static LONGEST | |
3975 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
3976 | const char *annex, gdb_byte *readbuf, | |
3977 | const gdb_byte *writebuf, | |
3978 | ULONGEST offset, LONGEST len) | |
dba24537 | 3979 | { |
10d6c8cd DJ |
3980 | LONGEST ret; |
3981 | int fd; | |
dba24537 AC |
3982 | char filename[64]; |
3983 | ||
10d6c8cd | 3984 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
3985 | return 0; |
3986 | ||
3987 | /* Don't bother for one word. */ | |
3988 | if (len < 3 * sizeof (long)) | |
3989 | return 0; | |
3990 | ||
3991 | /* We could keep this file open and cache it - possibly one per | |
3992 | thread. That requires some juggling, but is even faster. */ | |
3993 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
3994 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
3995 | if (fd == -1) | |
3996 | return 0; | |
3997 | ||
3998 | /* If pread64 is available, use it. It's faster if the kernel | |
3999 | supports it (only one syscall), and it's 64-bit safe even on | |
4000 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4001 | application). */ | |
4002 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4003 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4004 | #else |
10d6c8cd | 4005 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4006 | #endif |
4007 | ret = 0; | |
4008 | else | |
4009 | ret = len; | |
4010 | ||
4011 | close (fd); | |
4012 | return ret; | |
4013 | } | |
4014 | ||
4015 | /* Parse LINE as a signal set and add its set bits to SIGS. */ | |
4016 | ||
4017 | static void | |
4018 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4019 | { | |
4020 | int len = strlen (line) - 1; | |
4021 | const char *p; | |
4022 | int signum; | |
4023 | ||
4024 | if (line[len] != '\n') | |
8a3fe4f8 | 4025 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4026 | |
4027 | p = line; | |
4028 | signum = len * 4; | |
4029 | while (len-- > 0) | |
4030 | { | |
4031 | int digit; | |
4032 | ||
4033 | if (*p >= '0' && *p <= '9') | |
4034 | digit = *p - '0'; | |
4035 | else if (*p >= 'a' && *p <= 'f') | |
4036 | digit = *p - 'a' + 10; | |
4037 | else | |
8a3fe4f8 | 4038 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4039 | |
4040 | signum -= 4; | |
4041 | ||
4042 | if (digit & 1) | |
4043 | sigaddset (sigs, signum + 1); | |
4044 | if (digit & 2) | |
4045 | sigaddset (sigs, signum + 2); | |
4046 | if (digit & 4) | |
4047 | sigaddset (sigs, signum + 3); | |
4048 | if (digit & 8) | |
4049 | sigaddset (sigs, signum + 4); | |
4050 | ||
4051 | p++; | |
4052 | } | |
4053 | } | |
4054 | ||
4055 | /* Find process PID's pending signals from /proc/pid/status and set | |
4056 | SIGS to match. */ | |
4057 | ||
4058 | void | |
4059 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
4060 | { | |
4061 | FILE *procfile; | |
4062 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
4063 | int signum; | |
7c8a8b04 | 4064 | struct cleanup *cleanup; |
dba24537 AC |
4065 | |
4066 | sigemptyset (pending); | |
4067 | sigemptyset (blocked); | |
4068 | sigemptyset (ignored); | |
4069 | sprintf (fname, "/proc/%d/status", pid); | |
4070 | procfile = fopen (fname, "r"); | |
4071 | if (procfile == NULL) | |
8a3fe4f8 | 4072 | error (_("Could not open %s"), fname); |
7c8a8b04 | 4073 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4074 | |
4075 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
4076 | { | |
4077 | /* Normal queued signals are on the SigPnd line in the status | |
4078 | file. However, 2.6 kernels also have a "shared" pending | |
4079 | queue for delivering signals to a thread group, so check for | |
4080 | a ShdPnd line also. | |
4081 | ||
4082 | Unfortunately some Red Hat kernels include the shared pending | |
4083 | queue but not the ShdPnd status field. */ | |
4084 | ||
4085 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
4086 | add_line_to_sigset (buffer + 8, pending); | |
4087 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
4088 | add_line_to_sigset (buffer + 8, pending); | |
4089 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
4090 | add_line_to_sigset (buffer + 8, blocked); | |
4091 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
4092 | add_line_to_sigset (buffer + 8, ignored); | |
4093 | } | |
4094 | ||
7c8a8b04 | 4095 | do_cleanups (cleanup); |
dba24537 AC |
4096 | } |
4097 | ||
07e059b5 VP |
4098 | static LONGEST |
4099 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
4100 | const char *annex, gdb_byte *readbuf, | |
4101 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4102 | { | |
4103 | /* We make the process list snapshot when the object starts to be | |
4104 | read. */ | |
4105 | static const char *buf; | |
4106 | static LONGEST len_avail = -1; | |
4107 | static struct obstack obstack; | |
4108 | ||
4109 | DIR *dirp; | |
4110 | ||
4111 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
4112 | ||
4113 | if (strcmp (annex, "processes") != 0) | |
4114 | return 0; | |
4115 | ||
4116 | gdb_assert (readbuf && !writebuf); | |
4117 | ||
4118 | if (offset == 0) | |
4119 | { | |
4120 | if (len_avail != -1 && len_avail != 0) | |
4121 | obstack_free (&obstack, NULL); | |
4122 | len_avail = 0; | |
4123 | buf = NULL; | |
4124 | obstack_init (&obstack); | |
4125 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
4126 | ||
4127 | dirp = opendir ("/proc"); | |
4128 | if (dirp) | |
4129 | { | |
4130 | struct dirent *dp; | |
4131 | while ((dp = readdir (dirp)) != NULL) | |
4132 | { | |
4133 | struct stat statbuf; | |
4134 | char procentry[sizeof ("/proc/4294967295")]; | |
4135 | ||
4136 | if (!isdigit (dp->d_name[0]) | |
1a6d2f2f | 4137 | || NAMELEN (dp) > sizeof ("4294967295") - 1) |
07e059b5 VP |
4138 | continue; |
4139 | ||
4140 | sprintf (procentry, "/proc/%s", dp->d_name); | |
4141 | if (stat (procentry, &statbuf) == 0 | |
4142 | && S_ISDIR (statbuf.st_mode)) | |
4143 | { | |
4144 | char *pathname; | |
4145 | FILE *f; | |
4146 | char cmd[MAXPATHLEN + 1]; | |
4147 | struct passwd *entry; | |
4148 | ||
4149 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
4150 | entry = getpwuid (statbuf.st_uid); | |
4151 | ||
4152 | if ((f = fopen (pathname, "r")) != NULL) | |
4153 | { | |
4154 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
4155 | if (len > 0) | |
4156 | { | |
4157 | int i; | |
4158 | for (i = 0; i < len; i++) | |
4159 | if (cmd[i] == '\0') | |
4160 | cmd[i] = ' '; | |
4161 | cmd[len] = '\0'; | |
4162 | ||
4163 | obstack_xml_printf ( | |
4164 | &obstack, | |
4165 | "<item>" | |
4166 | "<column name=\"pid\">%s</column>" | |
4167 | "<column name=\"user\">%s</column>" | |
4168 | "<column name=\"command\">%s</column>" | |
4169 | "</item>", | |
4170 | dp->d_name, | |
4171 | entry ? entry->pw_name : "?", | |
4172 | cmd); | |
4173 | } | |
4174 | fclose (f); | |
4175 | } | |
4176 | ||
4177 | xfree (pathname); | |
4178 | } | |
4179 | } | |
4180 | ||
4181 | closedir (dirp); | |
4182 | } | |
4183 | ||
4184 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
4185 | buf = obstack_finish (&obstack); | |
4186 | len_avail = strlen (buf); | |
4187 | } | |
4188 | ||
4189 | if (offset >= len_avail) | |
4190 | { | |
4191 | /* Done. Get rid of the obstack. */ | |
4192 | obstack_free (&obstack, NULL); | |
4193 | buf = NULL; | |
4194 | len_avail = 0; | |
4195 | return 0; | |
4196 | } | |
4197 | ||
4198 | if (len > len_avail - offset) | |
4199 | len = len_avail - offset; | |
4200 | memcpy (readbuf, buf + offset, len); | |
4201 | ||
4202 | return len; | |
4203 | } | |
4204 | ||
10d6c8cd DJ |
4205 | static LONGEST |
4206 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
4207 | const char *annex, gdb_byte *readbuf, | |
4208 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4209 | { | |
4210 | LONGEST xfer; | |
4211 | ||
4212 | if (object == TARGET_OBJECT_AUXV) | |
4213 | return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf, | |
4214 | offset, len); | |
4215 | ||
07e059b5 VP |
4216 | if (object == TARGET_OBJECT_OSDATA) |
4217 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
4218 | offset, len); | |
4219 | ||
10d6c8cd DJ |
4220 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
4221 | offset, len); | |
4222 | if (xfer != 0) | |
4223 | return xfer; | |
4224 | ||
4225 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
4226 | offset, len); | |
4227 | } | |
4228 | ||
e9efe249 | 4229 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
4230 | it with local methods. */ |
4231 | ||
910122bf UW |
4232 | static void |
4233 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 4234 | { |
6d8fd2b7 UW |
4235 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
4236 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; | |
4237 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; | |
4238 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; | |
10d6c8cd | 4239 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
4240 | t->to_post_attach = linux_child_post_attach; |
4241 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
4242 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
4243 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
4244 | ||
4245 | super_xfer_partial = t->to_xfer_partial; | |
4246 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
4247 | } |
4248 | ||
4249 | struct target_ops * | |
4250 | linux_target (void) | |
4251 | { | |
4252 | struct target_ops *t; | |
4253 | ||
4254 | t = inf_ptrace_target (); | |
4255 | linux_target_install_ops (t); | |
4256 | ||
4257 | return t; | |
4258 | } | |
4259 | ||
4260 | struct target_ops * | |
7714d83a | 4261 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
4262 | { |
4263 | struct target_ops *t; | |
4264 | ||
4265 | t = inf_ptrace_trad_target (register_u_offset); | |
4266 | linux_target_install_ops (t); | |
10d6c8cd | 4267 | |
10d6c8cd DJ |
4268 | return t; |
4269 | } | |
4270 | ||
b84876c2 PA |
4271 | /* target_is_async_p implementation. */ |
4272 | ||
4273 | static int | |
4274 | linux_nat_is_async_p (void) | |
4275 | { | |
4276 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 4277 | it explicitly with the "set target-async" command. |
b84876c2 | 4278 | Someday, linux will always be async. */ |
c6ebd6cf | 4279 | if (!target_async_permitted) |
b84876c2 PA |
4280 | return 0; |
4281 | ||
d90e17a7 PA |
4282 | /* See target.h/target_async_mask. */ |
4283 | return linux_nat_async_mask_value; | |
b84876c2 PA |
4284 | } |
4285 | ||
4286 | /* target_can_async_p implementation. */ | |
4287 | ||
4288 | static int | |
4289 | linux_nat_can_async_p (void) | |
4290 | { | |
4291 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 4292 | it explicitly with the "set target-async" command. |
b84876c2 | 4293 | Someday, linux will always be async. */ |
c6ebd6cf | 4294 | if (!target_async_permitted) |
b84876c2 PA |
4295 | return 0; |
4296 | ||
4297 | /* See target.h/target_async_mask. */ | |
4298 | return linux_nat_async_mask_value; | |
4299 | } | |
4300 | ||
9908b566 VP |
4301 | static int |
4302 | linux_nat_supports_non_stop (void) | |
4303 | { | |
4304 | return 1; | |
4305 | } | |
4306 | ||
d90e17a7 PA |
4307 | /* True if we want to support multi-process. To be removed when GDB |
4308 | supports multi-exec. */ | |
4309 | ||
4310 | int linux_multi_process = 0; | |
4311 | ||
4312 | static int | |
4313 | linux_nat_supports_multi_process (void) | |
4314 | { | |
4315 | return linux_multi_process; | |
4316 | } | |
4317 | ||
b84876c2 PA |
4318 | /* target_async_mask implementation. */ |
4319 | ||
4320 | static int | |
7feb7d06 | 4321 | linux_nat_async_mask (int new_mask) |
b84876c2 | 4322 | { |
7feb7d06 | 4323 | int curr_mask = linux_nat_async_mask_value; |
b84876c2 | 4324 | |
7feb7d06 | 4325 | if (curr_mask != new_mask) |
b84876c2 | 4326 | { |
7feb7d06 | 4327 | if (new_mask == 0) |
b84876c2 PA |
4328 | { |
4329 | linux_nat_async (NULL, 0); | |
7feb7d06 | 4330 | linux_nat_async_mask_value = new_mask; |
b84876c2 PA |
4331 | } |
4332 | else | |
4333 | { | |
7feb7d06 | 4334 | linux_nat_async_mask_value = new_mask; |
84e46146 | 4335 | |
7feb7d06 PA |
4336 | /* If we're going out of async-mask in all-stop, then the |
4337 | inferior is stopped. The next resume will call | |
4338 | target_async. In non-stop, the target event source | |
4339 | should be always registered in the event loop. Do so | |
4340 | now. */ | |
4341 | if (non_stop) | |
4342 | linux_nat_async (inferior_event_handler, 0); | |
b84876c2 PA |
4343 | } |
4344 | } | |
4345 | ||
7feb7d06 | 4346 | return curr_mask; |
b84876c2 PA |
4347 | } |
4348 | ||
4349 | static int async_terminal_is_ours = 1; | |
4350 | ||
4351 | /* target_terminal_inferior implementation. */ | |
4352 | ||
4353 | static void | |
4354 | linux_nat_terminal_inferior (void) | |
4355 | { | |
4356 | if (!target_is_async_p ()) | |
4357 | { | |
4358 | /* Async mode is disabled. */ | |
4359 | terminal_inferior (); | |
4360 | return; | |
4361 | } | |
4362 | ||
b84876c2 PA |
4363 | terminal_inferior (); |
4364 | ||
d9d2d8b6 | 4365 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
4366 | if (!async_terminal_is_ours) |
4367 | return; | |
4368 | ||
4369 | delete_file_handler (input_fd); | |
4370 | async_terminal_is_ours = 0; | |
4371 | set_sigint_trap (); | |
4372 | } | |
4373 | ||
4374 | /* target_terminal_ours implementation. */ | |
4375 | ||
2c0b251b | 4376 | static void |
b84876c2 PA |
4377 | linux_nat_terminal_ours (void) |
4378 | { | |
4379 | if (!target_is_async_p ()) | |
4380 | { | |
4381 | /* Async mode is disabled. */ | |
4382 | terminal_ours (); | |
4383 | return; | |
4384 | } | |
4385 | ||
4386 | /* GDB should never give the terminal to the inferior if the | |
4387 | inferior is running in the background (run&, continue&, etc.), | |
4388 | but claiming it sure should. */ | |
4389 | terminal_ours (); | |
4390 | ||
b84876c2 PA |
4391 | if (async_terminal_is_ours) |
4392 | return; | |
4393 | ||
4394 | clear_sigint_trap (); | |
4395 | add_file_handler (input_fd, stdin_event_handler, 0); | |
4396 | async_terminal_is_ours = 1; | |
4397 | } | |
4398 | ||
4399 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
4400 | void *context); | |
4401 | static void *async_client_context; | |
4402 | ||
7feb7d06 PA |
4403 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4404 | so we notice when any child changes state, and notify the | |
4405 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
4406 | above to wait for the arrival of a SIGCHLD. */ | |
4407 | ||
b84876c2 | 4408 | static void |
7feb7d06 | 4409 | sigchld_handler (int signo) |
b84876c2 | 4410 | { |
7feb7d06 PA |
4411 | int old_errno = errno; |
4412 | ||
4413 | if (debug_linux_nat_async) | |
4414 | fprintf_unfiltered (gdb_stdlog, "sigchld\n"); | |
4415 | ||
4416 | if (signo == SIGCHLD | |
4417 | && linux_nat_event_pipe[0] != -1) | |
4418 | async_file_mark (); /* Let the event loop know that there are | |
4419 | events to handle. */ | |
4420 | ||
4421 | errno = old_errno; | |
4422 | } | |
4423 | ||
4424 | /* Callback registered with the target events file descriptor. */ | |
4425 | ||
4426 | static void | |
4427 | handle_target_event (int error, gdb_client_data client_data) | |
4428 | { | |
4429 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
4430 | } | |
4431 | ||
4432 | /* Create/destroy the target events pipe. Returns previous state. */ | |
4433 | ||
4434 | static int | |
4435 | linux_async_pipe (int enable) | |
4436 | { | |
4437 | int previous = (linux_nat_event_pipe[0] != -1); | |
4438 | ||
4439 | if (previous != enable) | |
4440 | { | |
4441 | sigset_t prev_mask; | |
4442 | ||
4443 | block_child_signals (&prev_mask); | |
4444 | ||
4445 | if (enable) | |
4446 | { | |
4447 | if (pipe (linux_nat_event_pipe) == -1) | |
4448 | internal_error (__FILE__, __LINE__, | |
4449 | "creating event pipe failed."); | |
4450 | ||
4451 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4452 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4453 | } | |
4454 | else | |
4455 | { | |
4456 | close (linux_nat_event_pipe[0]); | |
4457 | close (linux_nat_event_pipe[1]); | |
4458 | linux_nat_event_pipe[0] = -1; | |
4459 | linux_nat_event_pipe[1] = -1; | |
4460 | } | |
4461 | ||
4462 | restore_child_signals_mask (&prev_mask); | |
4463 | } | |
4464 | ||
4465 | return previous; | |
b84876c2 PA |
4466 | } |
4467 | ||
4468 | /* target_async implementation. */ | |
4469 | ||
4470 | static void | |
4471 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
4472 | void *context), void *context) | |
4473 | { | |
c6ebd6cf | 4474 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
4475 | internal_error (__FILE__, __LINE__, |
4476 | "Calling target_async when async is masked"); | |
4477 | ||
4478 | if (callback != NULL) | |
4479 | { | |
4480 | async_client_callback = callback; | |
4481 | async_client_context = context; | |
7feb7d06 PA |
4482 | if (!linux_async_pipe (1)) |
4483 | { | |
4484 | add_file_handler (linux_nat_event_pipe[0], | |
4485 | handle_target_event, NULL); | |
4486 | /* There may be pending events to handle. Tell the event loop | |
4487 | to poll them. */ | |
4488 | async_file_mark (); | |
4489 | } | |
b84876c2 PA |
4490 | } |
4491 | else | |
4492 | { | |
4493 | async_client_callback = callback; | |
4494 | async_client_context = context; | |
b84876c2 | 4495 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 4496 | linux_async_pipe (0); |
b84876c2 PA |
4497 | } |
4498 | return; | |
4499 | } | |
4500 | ||
252fbfc8 PA |
4501 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
4502 | event came out. */ | |
4503 | ||
4c28f408 | 4504 | static int |
252fbfc8 | 4505 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 4506 | { |
d90e17a7 | 4507 | if (!lwp->stopped) |
252fbfc8 | 4508 | { |
d90e17a7 PA |
4509 | int pid, status; |
4510 | ptid_t ptid = lwp->ptid; | |
252fbfc8 | 4511 | |
d90e17a7 PA |
4512 | if (debug_linux_nat) |
4513 | fprintf_unfiltered (gdb_stdlog, | |
4514 | "LNSL: running -> suspending %s\n", | |
4515 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 4516 | |
252fbfc8 | 4517 | |
d90e17a7 PA |
4518 | stop_callback (lwp, NULL); |
4519 | stop_wait_callback (lwp, NULL); | |
252fbfc8 | 4520 | |
d90e17a7 PA |
4521 | /* If the lwp exits while we try to stop it, there's nothing |
4522 | else to do. */ | |
4523 | lwp = find_lwp_pid (ptid); | |
4524 | if (lwp == NULL) | |
4525 | return 0; | |
252fbfc8 | 4526 | |
d90e17a7 PA |
4527 | /* If we didn't collect any signal other than SIGSTOP while |
4528 | stopping the LWP, push a SIGNAL_0 event. In either case, the | |
4529 | event-loop will end up calling target_wait which will collect | |
4530 | these. */ | |
4531 | if (lwp->status == 0) | |
4532 | lwp->status = W_STOPCODE (0); | |
4533 | async_file_mark (); | |
4534 | } | |
4535 | else | |
4536 | { | |
4537 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 4538 | |
d90e17a7 PA |
4539 | if (debug_linux_nat) |
4540 | { | |
4541 | if (find_thread_pid (lwp->ptid)->stop_requested) | |
4542 | fprintf_unfiltered (gdb_stdlog, "\ | |
252fbfc8 | 4543 | LNSL: already stopped/stop_requested %s\n", |
d90e17a7 PA |
4544 | target_pid_to_str (lwp->ptid)); |
4545 | else | |
4546 | fprintf_unfiltered (gdb_stdlog, "\ | |
252fbfc8 | 4547 | LNSL: already stopped/no stop_requested yet %s\n", |
d90e17a7 | 4548 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
4549 | } |
4550 | } | |
4c28f408 PA |
4551 | return 0; |
4552 | } | |
4553 | ||
4554 | static void | |
4555 | linux_nat_stop (ptid_t ptid) | |
4556 | { | |
4557 | if (non_stop) | |
d90e17a7 | 4558 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
4559 | else |
4560 | linux_ops->to_stop (ptid); | |
4561 | } | |
4562 | ||
d90e17a7 PA |
4563 | static void |
4564 | linux_nat_close (int quitting) | |
4565 | { | |
4566 | /* Unregister from the event loop. */ | |
4567 | if (target_is_async_p ()) | |
4568 | target_async (NULL, 0); | |
4569 | ||
4570 | /* Reset the async_masking. */ | |
4571 | linux_nat_async_mask_value = 1; | |
4572 | ||
4573 | if (linux_ops->to_close) | |
4574 | linux_ops->to_close (quitting); | |
4575 | } | |
4576 | ||
f973ed9c DJ |
4577 | void |
4578 | linux_nat_add_target (struct target_ops *t) | |
4579 | { | |
f973ed9c DJ |
4580 | /* Save the provided single-threaded target. We save this in a separate |
4581 | variable because another target we've inherited from (e.g. inf-ptrace) | |
4582 | may have saved a pointer to T; we want to use it for the final | |
4583 | process stratum target. */ | |
4584 | linux_ops_saved = *t; | |
4585 | linux_ops = &linux_ops_saved; | |
4586 | ||
4587 | /* Override some methods for multithreading. */ | |
b84876c2 | 4588 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
4589 | t->to_attach = linux_nat_attach; |
4590 | t->to_detach = linux_nat_detach; | |
4591 | t->to_resume = linux_nat_resume; | |
4592 | t->to_wait = linux_nat_wait; | |
4593 | t->to_xfer_partial = linux_nat_xfer_partial; | |
4594 | t->to_kill = linux_nat_kill; | |
4595 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
4596 | t->to_thread_alive = linux_nat_thread_alive; | |
4597 | t->to_pid_to_str = linux_nat_pid_to_str; | |
4598 | t->to_has_thread_control = tc_schedlock; | |
4599 | ||
b84876c2 PA |
4600 | t->to_can_async_p = linux_nat_can_async_p; |
4601 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 4602 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
4603 | t->to_async = linux_nat_async; |
4604 | t->to_async_mask = linux_nat_async_mask; | |
4605 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
4606 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 4607 | t->to_close = linux_nat_close; |
b84876c2 | 4608 | |
4c28f408 PA |
4609 | /* Methods for non-stop support. */ |
4610 | t->to_stop = linux_nat_stop; | |
4611 | ||
d90e17a7 PA |
4612 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
4613 | ||
f973ed9c DJ |
4614 | /* We don't change the stratum; this target will sit at |
4615 | process_stratum and thread_db will set at thread_stratum. This | |
4616 | is a little strange, since this is a multi-threaded-capable | |
4617 | target, but we want to be on the stack below thread_db, and we | |
4618 | also want to be used for single-threaded processes. */ | |
4619 | ||
4620 | add_target (t); | |
f973ed9c DJ |
4621 | } |
4622 | ||
9f0bdab8 DJ |
4623 | /* Register a method to call whenever a new thread is attached. */ |
4624 | void | |
4625 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
4626 | { | |
4627 | /* Save the pointer. We only support a single registered instance | |
4628 | of the GNU/Linux native target, so we do not need to map this to | |
4629 | T. */ | |
4630 | linux_nat_new_thread = new_thread; | |
4631 | } | |
4632 | ||
5b009018 PA |
4633 | /* Register a method that converts a siginfo object between the layout |
4634 | that ptrace returns, and the layout in the architecture of the | |
4635 | inferior. */ | |
4636 | void | |
4637 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
4638 | int (*siginfo_fixup) (struct siginfo *, | |
4639 | gdb_byte *, | |
4640 | int)) | |
4641 | { | |
4642 | /* Save the pointer. */ | |
4643 | linux_nat_siginfo_fixup = siginfo_fixup; | |
4644 | } | |
4645 | ||
9f0bdab8 DJ |
4646 | /* Return the saved siginfo associated with PTID. */ |
4647 | struct siginfo * | |
4648 | linux_nat_get_siginfo (ptid_t ptid) | |
4649 | { | |
4650 | struct lwp_info *lp = find_lwp_pid (ptid); | |
4651 | ||
4652 | gdb_assert (lp != NULL); | |
4653 | ||
4654 | return &lp->siginfo; | |
4655 | } | |
4656 | ||
2c0b251b PA |
4657 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
4658 | extern initialize_file_ftype _initialize_linux_nat; | |
4659 | ||
d6b0e80f AC |
4660 | void |
4661 | _initialize_linux_nat (void) | |
4662 | { | |
b84876c2 | 4663 | sigset_t mask; |
dba24537 | 4664 | |
1bedd215 AC |
4665 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
4666 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
4667 | Specify any process id, or use the program being debugged by default.\n\ |
4668 | Specify any of the following keywords for detailed info:\n\ | |
4669 | mappings -- list of mapped memory regions.\n\ | |
4670 | stat -- list a bunch of random process info.\n\ | |
4671 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 4672 | all -- list all available /proc info.")); |
d6b0e80f | 4673 | |
b84876c2 PA |
4674 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
4675 | &debug_linux_nat, _("\ | |
4676 | Set debugging of GNU/Linux lwp module."), _("\ | |
4677 | Show debugging of GNU/Linux lwp module."), _("\ | |
4678 | Enables printf debugging output."), | |
4679 | NULL, | |
4680 | show_debug_linux_nat, | |
4681 | &setdebuglist, &showdebuglist); | |
4682 | ||
4683 | add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance, | |
4684 | &debug_linux_nat_async, _("\ | |
4685 | Set debugging of GNU/Linux async lwp module."), _("\ | |
4686 | Show debugging of GNU/Linux async lwp module."), _("\ | |
4687 | Enables printf debugging output."), | |
4688 | NULL, | |
4689 | show_debug_linux_nat_async, | |
4690 | &setdebuglist, &showdebuglist); | |
4691 | ||
b84876c2 | 4692 | /* Save this mask as the default. */ |
d6b0e80f AC |
4693 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
4694 | ||
7feb7d06 PA |
4695 | /* Install a SIGCHLD handler. */ |
4696 | sigchld_action.sa_handler = sigchld_handler; | |
4697 | sigemptyset (&sigchld_action.sa_mask); | |
4698 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
4699 | |
4700 | /* Make it the default. */ | |
7feb7d06 | 4701 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
4702 | |
4703 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
4704 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
4705 | sigdelset (&suspend_mask, SIGCHLD); | |
4706 | ||
7feb7d06 | 4707 | sigemptyset (&blocked_mask); |
10568435 JK |
4708 | |
4709 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
4710 | &disable_randomization, _("\ | |
4711 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
4712 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
4713 | When this mode is on (which is the default), randomization of the virtual\n\ | |
4714 | address space is disabled. Standalone programs run with the randomization\n\ | |
4715 | enabled by default on some platforms."), | |
4716 | &set_disable_randomization, | |
4717 | &show_disable_randomization, | |
4718 | &setlist, &showlist); | |
d6b0e80f AC |
4719 | } |
4720 | \f | |
4721 | ||
4722 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
4723 | the GNU/Linux Threads library and therefore doesn't really belong | |
4724 | here. */ | |
4725 | ||
4726 | /* Read variable NAME in the target and return its value if found. | |
4727 | Otherwise return zero. It is assumed that the type of the variable | |
4728 | is `int'. */ | |
4729 | ||
4730 | static int | |
4731 | get_signo (const char *name) | |
4732 | { | |
4733 | struct minimal_symbol *ms; | |
4734 | int signo; | |
4735 | ||
4736 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
4737 | if (ms == NULL) | |
4738 | return 0; | |
4739 | ||
8e70166d | 4740 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
4741 | sizeof (signo)) != 0) |
4742 | return 0; | |
4743 | ||
4744 | return signo; | |
4745 | } | |
4746 | ||
4747 | /* Return the set of signals used by the threads library in *SET. */ | |
4748 | ||
4749 | void | |
4750 | lin_thread_get_thread_signals (sigset_t *set) | |
4751 | { | |
4752 | struct sigaction action; | |
4753 | int restart, cancel; | |
4754 | ||
b84876c2 | 4755 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
4756 | sigemptyset (set); |
4757 | ||
4758 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
4759 | cancel = get_signo ("__pthread_sig_cancel"); |
4760 | ||
4761 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
4762 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
4763 | not provide any way for the debugger to query the signal numbers - | |
4764 | fortunately they don't change! */ | |
4765 | ||
d6b0e80f | 4766 | if (restart == 0) |
17fbb0bd | 4767 | restart = __SIGRTMIN; |
d6b0e80f | 4768 | |
d6b0e80f | 4769 | if (cancel == 0) |
17fbb0bd | 4770 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
4771 | |
4772 | sigaddset (set, restart); | |
4773 | sigaddset (set, cancel); | |
4774 | ||
4775 | /* The GNU/Linux Threads library makes terminating threads send a | |
4776 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
4777 | those (to prevent them from terminating GDB itself, which is | |
4778 | likely to be their default action) and treat them the same way as | |
4779 | SIGCHLD. */ | |
4780 | ||
4781 | action.sa_handler = sigchld_handler; | |
4782 | sigemptyset (&action.sa_mask); | |
58aecb61 | 4783 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
4784 | sigaction (cancel, &action, NULL); |
4785 | ||
4786 | /* We block the "cancel" signal throughout this code ... */ | |
4787 | sigaddset (&blocked_mask, cancel); | |
4788 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
4789 | ||
4790 | /* ... except during a sigsuspend. */ | |
4791 | sigdelset (&suspend_mask, cancel); | |
4792 | } |