Commit | Line | Data |
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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
0fb0cc75 | 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
e26af52f | 4 | Free Software Foundation, Inc. |
3993f6b1 DJ |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
3993f6b1 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
3993f6b1 DJ |
20 | |
21 | #include "defs.h" | |
22 | #include "inferior.h" | |
23 | #include "target.h" | |
d6b0e80f | 24 | #include "gdb_string.h" |
3993f6b1 | 25 | #include "gdb_wait.h" |
d6b0e80f AC |
26 | #include "gdb_assert.h" |
27 | #ifdef HAVE_TKILL_SYSCALL | |
28 | #include <unistd.h> | |
29 | #include <sys/syscall.h> | |
30 | #endif | |
3993f6b1 | 31 | #include <sys/ptrace.h> |
0274a8ce | 32 | #include "linux-nat.h" |
ac264b3b | 33 | #include "linux-fork.h" |
d6b0e80f AC |
34 | #include "gdbthread.h" |
35 | #include "gdbcmd.h" | |
36 | #include "regcache.h" | |
4f844a66 | 37 | #include "regset.h" |
10d6c8cd DJ |
38 | #include "inf-ptrace.h" |
39 | #include "auxv.h" | |
dba24537 AC |
40 | #include <sys/param.h> /* for MAXPATHLEN */ |
41 | #include <sys/procfs.h> /* for elf_gregset etc. */ | |
42 | #include "elf-bfd.h" /* for elfcore_write_* */ | |
43 | #include "gregset.h" /* for gregset */ | |
44 | #include "gdbcore.h" /* for get_exec_file */ | |
45 | #include <ctype.h> /* for isdigit */ | |
46 | #include "gdbthread.h" /* for struct thread_info etc. */ | |
47 | #include "gdb_stat.h" /* for struct stat */ | |
48 | #include <fcntl.h> /* for O_RDONLY */ | |
b84876c2 PA |
49 | #include "inf-loop.h" |
50 | #include "event-loop.h" | |
51 | #include "event-top.h" | |
07e059b5 VP |
52 | #include <pwd.h> |
53 | #include <sys/types.h> | |
54 | #include "gdb_dirent.h" | |
55 | #include "xml-support.h" | |
191c4426 | 56 | #include "terminal.h" |
efcbbd14 | 57 | #include <sys/vfs.h> |
6c95b8df | 58 | #include "solib.h" |
efcbbd14 UW |
59 | |
60 | #ifndef SPUFS_MAGIC | |
61 | #define SPUFS_MAGIC 0x23c9b64e | |
62 | #endif | |
dba24537 | 63 | |
10568435 JK |
64 | #ifdef HAVE_PERSONALITY |
65 | # include <sys/personality.h> | |
66 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
67 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
68 | # endif | |
69 | #endif /* HAVE_PERSONALITY */ | |
70 | ||
8a77dff3 VP |
71 | /* This comment documents high-level logic of this file. |
72 | ||
73 | Waiting for events in sync mode | |
74 | =============================== | |
75 | ||
76 | When waiting for an event in a specific thread, we just use waitpid, passing | |
77 | the specific pid, and not passing WNOHANG. | |
78 | ||
79 | When waiting for an event in all threads, waitpid is not quite good. Prior to | |
80 | version 2.4, Linux can either wait for event in main thread, or in secondary | |
81 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might | |
82 | miss an event. The solution is to use non-blocking waitpid, together with | |
83 | sigsuspend. First, we use non-blocking waitpid to get an event in the main | |
84 | process, if any. Second, we use non-blocking waitpid with the __WCLONED | |
85 | flag to check for events in cloned processes. If nothing is found, we use | |
86 | sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something | |
87 | happened to a child process -- and SIGCHLD will be delivered both for events | |
88 | in main debugged process and in cloned processes. As soon as we know there's | |
89 | an event, we get back to calling nonblocking waitpid with and without __WCLONED. | |
90 | ||
91 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
92 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's | |
93 | blocked, the signal becomes pending and sigsuspend immediately | |
94 | notices it and returns. | |
95 | ||
96 | Waiting for events in async mode | |
97 | ================================ | |
98 | ||
7feb7d06 PA |
99 | In async mode, GDB should always be ready to handle both user input |
100 | and target events, so neither blocking waitpid nor sigsuspend are | |
101 | viable options. Instead, we should asynchronously notify the GDB main | |
102 | event loop whenever there's an unprocessed event from the target. We | |
103 | detect asynchronous target events by handling SIGCHLD signals. To | |
104 | notify the event loop about target events, the self-pipe trick is used | |
105 | --- a pipe is registered as waitable event source in the event loop, | |
106 | the event loop select/poll's on the read end of this pipe (as well on | |
107 | other event sources, e.g., stdin), and the SIGCHLD handler writes a | |
108 | byte to this pipe. This is more portable than relying on | |
109 | pselect/ppoll, since on kernels that lack those syscalls, libc | |
110 | emulates them with select/poll+sigprocmask, and that is racy | |
111 | (a.k.a. plain broken). | |
112 | ||
113 | Obviously, if we fail to notify the event loop if there's a target | |
114 | event, it's bad. OTOH, if we notify the event loop when there's no | |
115 | event from the target, linux_nat_wait will detect that there's no real | |
116 | event to report, and return event of type TARGET_WAITKIND_IGNORE. | |
117 | This is mostly harmless, but it will waste time and is better avoided. | |
118 | ||
119 | The main design point is that every time GDB is outside linux-nat.c, | |
120 | we have a SIGCHLD handler installed that is called when something | |
121 | happens to the target and notifies the GDB event loop. Whenever GDB | |
122 | core decides to handle the event, and calls into linux-nat.c, we | |
123 | process things as in sync mode, except that the we never block in | |
124 | sigsuspend. | |
125 | ||
126 | While processing an event, we may end up momentarily blocked in | |
127 | waitpid calls. Those waitpid calls, while blocking, are guarantied to | |
128 | return quickly. E.g., in all-stop mode, before reporting to the core | |
129 | that an LWP hit a breakpoint, all LWPs are stopped by sending them | |
130 | SIGSTOP, and synchronously waiting for the SIGSTOP to be reported. | |
131 | Note that this is different from blocking indefinitely waiting for the | |
132 | next event --- here, we're already handling an event. | |
8a77dff3 VP |
133 | |
134 | Use of signals | |
135 | ============== | |
136 | ||
137 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
138 | signal is not entirely significant; we just need for a signal to be delivered, | |
139 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
140 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
141 | be queued once; we do not keep track of other sources of SIGSTOP. | |
142 | ||
143 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
144 | use them, because they have special behavior when the signal is generated - | |
145 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
146 | kills the entire thread group. | |
147 | ||
148 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
149 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
150 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
151 | ||
152 | We could use a real-time signal instead. This would solve those problems; we | |
153 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
154 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
155 | generates it, and there are races with trying to find a signal that is not | |
156 | blocked. */ | |
a0ef4274 | 157 | |
dba24537 AC |
158 | #ifndef O_LARGEFILE |
159 | #define O_LARGEFILE 0 | |
160 | #endif | |
0274a8ce | 161 | |
3993f6b1 DJ |
162 | /* If the system headers did not provide the constants, hard-code the normal |
163 | values. */ | |
164 | #ifndef PTRACE_EVENT_FORK | |
165 | ||
166 | #define PTRACE_SETOPTIONS 0x4200 | |
167 | #define PTRACE_GETEVENTMSG 0x4201 | |
168 | ||
169 | /* options set using PTRACE_SETOPTIONS */ | |
170 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
171 | #define PTRACE_O_TRACEFORK 0x00000002 | |
172 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
173 | #define PTRACE_O_TRACECLONE 0x00000008 | |
174 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
9016a515 DJ |
175 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
176 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
3993f6b1 DJ |
177 | |
178 | /* Wait extended result codes for the above trace options. */ | |
179 | #define PTRACE_EVENT_FORK 1 | |
180 | #define PTRACE_EVENT_VFORK 2 | |
181 | #define PTRACE_EVENT_CLONE 3 | |
182 | #define PTRACE_EVENT_EXEC 4 | |
c874c7fc | 183 | #define PTRACE_EVENT_VFORK_DONE 5 |
9016a515 | 184 | #define PTRACE_EVENT_EXIT 6 |
3993f6b1 DJ |
185 | |
186 | #endif /* PTRACE_EVENT_FORK */ | |
187 | ||
ca2163eb PA |
188 | /* Unlike other extended result codes, WSTOPSIG (status) on |
189 | PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but | |
190 | instead SIGTRAP with bit 7 set. */ | |
191 | #define SYSCALL_SIGTRAP (SIGTRAP | 0x80) | |
192 | ||
3993f6b1 DJ |
193 | /* We can't always assume that this flag is available, but all systems |
194 | with the ptrace event handlers also have __WALL, so it's safe to use | |
195 | here. */ | |
196 | #ifndef __WALL | |
197 | #define __WALL 0x40000000 /* Wait for any child. */ | |
198 | #endif | |
199 | ||
02d3ff8c | 200 | #ifndef PTRACE_GETSIGINFO |
1ef18d08 PA |
201 | # define PTRACE_GETSIGINFO 0x4202 |
202 | # define PTRACE_SETSIGINFO 0x4203 | |
02d3ff8c UW |
203 | #endif |
204 | ||
10d6c8cd DJ |
205 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
206 | the use of the multi-threaded target. */ | |
207 | static struct target_ops *linux_ops; | |
f973ed9c | 208 | static struct target_ops linux_ops_saved; |
10d6c8cd | 209 | |
9f0bdab8 DJ |
210 | /* The method to call, if any, when a new thread is attached. */ |
211 | static void (*linux_nat_new_thread) (ptid_t); | |
212 | ||
5b009018 PA |
213 | /* The method to call, if any, when the siginfo object needs to be |
214 | converted between the layout returned by ptrace, and the layout in | |
215 | the architecture of the inferior. */ | |
216 | static int (*linux_nat_siginfo_fixup) (struct siginfo *, | |
217 | gdb_byte *, | |
218 | int); | |
219 | ||
ac264b3b MS |
220 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
221 | Called by our to_xfer_partial. */ | |
222 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
223 | enum target_object, | |
224 | const char *, gdb_byte *, | |
225 | const gdb_byte *, | |
10d6c8cd DJ |
226 | ULONGEST, LONGEST); |
227 | ||
d6b0e80f | 228 | static int debug_linux_nat; |
920d2a44 AC |
229 | static void |
230 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
231 | struct cmd_list_element *c, const char *value) | |
232 | { | |
233 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
234 | value); | |
235 | } | |
d6b0e80f | 236 | |
b84876c2 PA |
237 | static int debug_linux_nat_async = 0; |
238 | static void | |
239 | show_debug_linux_nat_async (struct ui_file *file, int from_tty, | |
240 | struct cmd_list_element *c, const char *value) | |
241 | { | |
242 | fprintf_filtered (file, _("Debugging of GNU/Linux async lwp module is %s.\n"), | |
243 | value); | |
244 | } | |
245 | ||
10568435 JK |
246 | static int disable_randomization = 1; |
247 | ||
248 | static void | |
249 | show_disable_randomization (struct ui_file *file, int from_tty, | |
250 | struct cmd_list_element *c, const char *value) | |
251 | { | |
252 | #ifdef HAVE_PERSONALITY | |
253 | fprintf_filtered (file, _("\ | |
254 | Disabling randomization of debuggee's virtual address space is %s.\n"), | |
255 | value); | |
256 | #else /* !HAVE_PERSONALITY */ | |
257 | fputs_filtered (_("\ | |
258 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
259 | this platform.\n"), file); | |
260 | #endif /* !HAVE_PERSONALITY */ | |
261 | } | |
262 | ||
263 | static void | |
264 | set_disable_randomization (char *args, int from_tty, struct cmd_list_element *c) | |
265 | { | |
266 | #ifndef HAVE_PERSONALITY | |
267 | error (_("\ | |
268 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
269 | this platform.")); | |
270 | #endif /* !HAVE_PERSONALITY */ | |
271 | } | |
272 | ||
9016a515 DJ |
273 | static int linux_parent_pid; |
274 | ||
ae087d01 DJ |
275 | struct simple_pid_list |
276 | { | |
277 | int pid; | |
3d799a95 | 278 | int status; |
ae087d01 DJ |
279 | struct simple_pid_list *next; |
280 | }; | |
281 | struct simple_pid_list *stopped_pids; | |
282 | ||
3993f6b1 DJ |
283 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
284 | can not be used, 1 if it can. */ | |
285 | ||
286 | static int linux_supports_tracefork_flag = -1; | |
287 | ||
a96d9b2e SDJ |
288 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACESYSGOOD |
289 | can not be used, 1 if it can. */ | |
290 | ||
291 | static int linux_supports_tracesysgood_flag = -1; | |
292 | ||
9016a515 DJ |
293 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
294 | PTRACE_O_TRACEVFORKDONE. */ | |
295 | ||
296 | static int linux_supports_tracevforkdone_flag = -1; | |
297 | ||
b84876c2 PA |
298 | /* Async mode support */ |
299 | ||
b84876c2 PA |
300 | /* Zero if the async mode, although enabled, is masked, which means |
301 | linux_nat_wait should behave as if async mode was off. */ | |
302 | static int linux_nat_async_mask_value = 1; | |
303 | ||
a96d9b2e SDJ |
304 | /* Stores the current used ptrace() options. */ |
305 | static int current_ptrace_options = 0; | |
306 | ||
b84876c2 PA |
307 | /* The read/write ends of the pipe registered as waitable file in the |
308 | event loop. */ | |
309 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
310 | ||
7feb7d06 | 311 | /* Flush the event pipe. */ |
b84876c2 | 312 | |
7feb7d06 PA |
313 | static void |
314 | async_file_flush (void) | |
b84876c2 | 315 | { |
7feb7d06 PA |
316 | int ret; |
317 | char buf; | |
b84876c2 | 318 | |
7feb7d06 | 319 | do |
b84876c2 | 320 | { |
7feb7d06 | 321 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 322 | } |
7feb7d06 | 323 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
324 | } |
325 | ||
7feb7d06 PA |
326 | /* Put something (anything, doesn't matter what, or how much) in event |
327 | pipe, so that the select/poll in the event-loop realizes we have | |
328 | something to process. */ | |
252fbfc8 | 329 | |
b84876c2 | 330 | static void |
7feb7d06 | 331 | async_file_mark (void) |
b84876c2 | 332 | { |
7feb7d06 | 333 | int ret; |
b84876c2 | 334 | |
7feb7d06 PA |
335 | /* It doesn't really matter what the pipe contains, as long we end |
336 | up with something in it. Might as well flush the previous | |
337 | left-overs. */ | |
338 | async_file_flush (); | |
b84876c2 | 339 | |
7feb7d06 | 340 | do |
b84876c2 | 341 | { |
7feb7d06 | 342 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 343 | } |
7feb7d06 | 344 | while (ret == -1 && errno == EINTR); |
b84876c2 | 345 | |
7feb7d06 PA |
346 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
347 | be awakened anyway. */ | |
b84876c2 PA |
348 | } |
349 | ||
7feb7d06 PA |
350 | static void linux_nat_async (void (*callback) |
351 | (enum inferior_event_type event_type, void *context), | |
352 | void *context); | |
353 | static int linux_nat_async_mask (int mask); | |
354 | static int kill_lwp (int lwpid, int signo); | |
355 | ||
356 | static int stop_callback (struct lwp_info *lp, void *data); | |
357 | ||
358 | static void block_child_signals (sigset_t *prev_mask); | |
359 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
2277426b PA |
360 | |
361 | struct lwp_info; | |
362 | static struct lwp_info *add_lwp (ptid_t ptid); | |
363 | static void purge_lwp_list (int pid); | |
364 | static struct lwp_info *find_lwp_pid (ptid_t ptid); | |
365 | ||
ae087d01 DJ |
366 | \f |
367 | /* Trivial list manipulation functions to keep track of a list of | |
368 | new stopped processes. */ | |
369 | static void | |
3d799a95 | 370 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
371 | { |
372 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
373 | new_pid->pid = pid; | |
3d799a95 | 374 | new_pid->status = status; |
ae087d01 DJ |
375 | new_pid->next = *listp; |
376 | *listp = new_pid; | |
377 | } | |
378 | ||
379 | static int | |
3d799a95 | 380 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *status) |
ae087d01 DJ |
381 | { |
382 | struct simple_pid_list **p; | |
383 | ||
384 | for (p = listp; *p != NULL; p = &(*p)->next) | |
385 | if ((*p)->pid == pid) | |
386 | { | |
387 | struct simple_pid_list *next = (*p)->next; | |
3d799a95 | 388 | *status = (*p)->status; |
ae087d01 DJ |
389 | xfree (*p); |
390 | *p = next; | |
391 | return 1; | |
392 | } | |
393 | return 0; | |
394 | } | |
395 | ||
3d799a95 DJ |
396 | static void |
397 | linux_record_stopped_pid (int pid, int status) | |
ae087d01 | 398 | { |
3d799a95 | 399 | add_to_pid_list (&stopped_pids, pid, status); |
ae087d01 DJ |
400 | } |
401 | ||
3993f6b1 DJ |
402 | \f |
403 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
404 | ||
405 | static void | |
406 | linux_tracefork_child (void) | |
407 | { | |
408 | int ret; | |
409 | ||
410 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
411 | kill (getpid (), SIGSTOP); | |
412 | fork (); | |
48bb3cce | 413 | _exit (0); |
3993f6b1 DJ |
414 | } |
415 | ||
7feb7d06 | 416 | /* Wrapper function for waitpid which handles EINTR. */ |
b957e937 DJ |
417 | |
418 | static int | |
419 | my_waitpid (int pid, int *status, int flags) | |
420 | { | |
421 | int ret; | |
b84876c2 | 422 | |
b957e937 DJ |
423 | do |
424 | { | |
425 | ret = waitpid (pid, status, flags); | |
426 | } | |
427 | while (ret == -1 && errno == EINTR); | |
428 | ||
429 | return ret; | |
430 | } | |
431 | ||
432 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
433 | ||
434 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
435 | we know that the feature is not available. This may change the tracing | |
436 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
437 | ||
438 | However, if it succeeds, we don't know for sure that the feature is | |
439 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 440 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
441 | fork tracing, and let it fork. If the process exits, we assume that we |
442 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
443 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
444 | |
445 | static void | |
b957e937 | 446 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
447 | { |
448 | int child_pid, ret, status; | |
449 | long second_pid; | |
7feb7d06 | 450 | sigset_t prev_mask; |
4c28f408 | 451 | |
7feb7d06 PA |
452 | /* We don't want those ptrace calls to be interrupted. */ |
453 | block_child_signals (&prev_mask); | |
3993f6b1 | 454 | |
b957e937 DJ |
455 | linux_supports_tracefork_flag = 0; |
456 | linux_supports_tracevforkdone_flag = 0; | |
457 | ||
458 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
459 | if (ret != 0) | |
7feb7d06 PA |
460 | { |
461 | restore_child_signals_mask (&prev_mask); | |
462 | return; | |
463 | } | |
b957e937 | 464 | |
3993f6b1 DJ |
465 | child_pid = fork (); |
466 | if (child_pid == -1) | |
e2e0b3e5 | 467 | perror_with_name (("fork")); |
3993f6b1 DJ |
468 | |
469 | if (child_pid == 0) | |
470 | linux_tracefork_child (); | |
471 | ||
b957e937 | 472 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 473 | if (ret == -1) |
e2e0b3e5 | 474 | perror_with_name (("waitpid")); |
3993f6b1 | 475 | else if (ret != child_pid) |
8a3fe4f8 | 476 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 477 | if (! WIFSTOPPED (status)) |
8a3fe4f8 | 478 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status); |
3993f6b1 | 479 | |
3993f6b1 DJ |
480 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
481 | if (ret != 0) | |
482 | { | |
b957e937 DJ |
483 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
484 | if (ret != 0) | |
485 | { | |
8a3fe4f8 | 486 | warning (_("linux_test_for_tracefork: failed to kill child")); |
7feb7d06 | 487 | restore_child_signals_mask (&prev_mask); |
b957e937 DJ |
488 | return; |
489 | } | |
490 | ||
491 | ret = my_waitpid (child_pid, &status, 0); | |
492 | if (ret != child_pid) | |
8a3fe4f8 | 493 | warning (_("linux_test_for_tracefork: failed to wait for killed child")); |
b957e937 | 494 | else if (!WIFSIGNALED (status)) |
8a3fe4f8 AC |
495 | warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from " |
496 | "killed child"), status); | |
b957e937 | 497 | |
7feb7d06 | 498 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
499 | return; |
500 | } | |
501 | ||
9016a515 DJ |
502 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
503 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
504 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
505 | linux_supports_tracevforkdone_flag = (ret == 0); | |
506 | ||
b957e937 DJ |
507 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
508 | if (ret != 0) | |
8a3fe4f8 | 509 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
510 | |
511 | ret = my_waitpid (child_pid, &status, 0); | |
512 | ||
3993f6b1 DJ |
513 | if (ret == child_pid && WIFSTOPPED (status) |
514 | && status >> 16 == PTRACE_EVENT_FORK) | |
515 | { | |
516 | second_pid = 0; | |
517 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
518 | if (ret == 0 && second_pid != 0) | |
519 | { | |
520 | int second_status; | |
521 | ||
522 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
523 | my_waitpid (second_pid, &second_status, 0); |
524 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
525 | if (ret != 0) | |
8a3fe4f8 | 526 | warning (_("linux_test_for_tracefork: failed to kill second child")); |
97725dc4 | 527 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
528 | } |
529 | } | |
b957e937 | 530 | else |
8a3fe4f8 AC |
531 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
532 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 533 | |
b957e937 DJ |
534 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
535 | if (ret != 0) | |
8a3fe4f8 | 536 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 537 | my_waitpid (child_pid, &status, 0); |
4c28f408 | 538 | |
7feb7d06 | 539 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
540 | } |
541 | ||
a96d9b2e SDJ |
542 | /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls. |
543 | ||
544 | We try to enable syscall tracing on ORIGINAL_PID. If this fails, | |
545 | we know that the feature is not available. This may change the tracing | |
546 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. */ | |
547 | ||
548 | static void | |
549 | linux_test_for_tracesysgood (int original_pid) | |
550 | { | |
551 | int ret; | |
552 | sigset_t prev_mask; | |
553 | ||
554 | /* We don't want those ptrace calls to be interrupted. */ | |
555 | block_child_signals (&prev_mask); | |
556 | ||
557 | linux_supports_tracesysgood_flag = 0; | |
558 | ||
559 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACESYSGOOD); | |
560 | if (ret != 0) | |
561 | goto out; | |
562 | ||
563 | linux_supports_tracesysgood_flag = 1; | |
564 | out: | |
565 | restore_child_signals_mask (&prev_mask); | |
566 | } | |
567 | ||
568 | /* Determine wether we support PTRACE_O_TRACESYSGOOD option available. | |
569 | This function also sets linux_supports_tracesysgood_flag. */ | |
570 | ||
571 | static int | |
572 | linux_supports_tracesysgood (int pid) | |
573 | { | |
574 | if (linux_supports_tracesysgood_flag == -1) | |
575 | linux_test_for_tracesysgood (pid); | |
576 | return linux_supports_tracesysgood_flag; | |
577 | } | |
578 | ||
3993f6b1 DJ |
579 | /* Return non-zero iff we have tracefork functionality available. |
580 | This function also sets linux_supports_tracefork_flag. */ | |
581 | ||
582 | static int | |
b957e937 | 583 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
584 | { |
585 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 586 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
587 | return linux_supports_tracefork_flag; |
588 | } | |
589 | ||
9016a515 | 590 | static int |
b957e937 | 591 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
592 | { |
593 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 594 | linux_test_for_tracefork (pid); |
9016a515 DJ |
595 | return linux_supports_tracevforkdone_flag; |
596 | } | |
597 | ||
a96d9b2e SDJ |
598 | static void |
599 | linux_enable_tracesysgood (ptid_t ptid) | |
600 | { | |
601 | int pid = ptid_get_lwp (ptid); | |
602 | ||
603 | if (pid == 0) | |
604 | pid = ptid_get_pid (ptid); | |
605 | ||
606 | if (linux_supports_tracesysgood (pid) == 0) | |
607 | return; | |
608 | ||
609 | current_ptrace_options |= PTRACE_O_TRACESYSGOOD; | |
610 | ||
611 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); | |
612 | } | |
613 | ||
3993f6b1 | 614 | \f |
4de4c07c DJ |
615 | void |
616 | linux_enable_event_reporting (ptid_t ptid) | |
617 | { | |
d3587048 | 618 | int pid = ptid_get_lwp (ptid); |
4de4c07c | 619 | |
d3587048 DJ |
620 | if (pid == 0) |
621 | pid = ptid_get_pid (ptid); | |
622 | ||
b957e937 | 623 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
624 | return; |
625 | ||
a96d9b2e SDJ |
626 | current_ptrace_options |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK |
627 | | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE; | |
628 | ||
b957e937 | 629 | if (linux_supports_tracevforkdone (pid)) |
a96d9b2e | 630 | current_ptrace_options |= PTRACE_O_TRACEVFORKDONE; |
9016a515 DJ |
631 | |
632 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
633 | read-only process state. */ | |
4de4c07c | 634 | |
a96d9b2e | 635 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); |
4de4c07c DJ |
636 | } |
637 | ||
6d8fd2b7 UW |
638 | static void |
639 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
640 | { |
641 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
0ec9a092 | 642 | check_for_thread_db (); |
a96d9b2e | 643 | linux_enable_tracesysgood (pid_to_ptid (pid)); |
4de4c07c DJ |
644 | } |
645 | ||
10d6c8cd | 646 | static void |
4de4c07c DJ |
647 | linux_child_post_startup_inferior (ptid_t ptid) |
648 | { | |
649 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 650 | check_for_thread_db (); |
a96d9b2e | 651 | linux_enable_tracesysgood (ptid); |
4de4c07c DJ |
652 | } |
653 | ||
6d8fd2b7 UW |
654 | static int |
655 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 656 | { |
7feb7d06 | 657 | sigset_t prev_mask; |
9016a515 | 658 | int has_vforked; |
4de4c07c DJ |
659 | int parent_pid, child_pid; |
660 | ||
7feb7d06 | 661 | block_child_signals (&prev_mask); |
b84876c2 | 662 | |
e58b0e63 PA |
663 | has_vforked = (inferior_thread ()->pending_follow.kind |
664 | == TARGET_WAITKIND_VFORKED); | |
665 | parent_pid = ptid_get_lwp (inferior_ptid); | |
d3587048 | 666 | if (parent_pid == 0) |
e58b0e63 PA |
667 | parent_pid = ptid_get_pid (inferior_ptid); |
668 | child_pid = PIDGET (inferior_thread ()->pending_follow.value.related_pid); | |
4de4c07c | 669 | |
2277426b PA |
670 | if (!detach_fork) |
671 | linux_enable_event_reporting (pid_to_ptid (child_pid)); | |
672 | ||
6c95b8df PA |
673 | if (has_vforked |
674 | && !non_stop /* Non-stop always resumes both branches. */ | |
675 | && (!target_is_async_p () || sync_execution) | |
676 | && !(follow_child || detach_fork || sched_multi)) | |
677 | { | |
678 | /* The parent stays blocked inside the vfork syscall until the | |
679 | child execs or exits. If we don't let the child run, then | |
680 | the parent stays blocked. If we're telling the parent to run | |
681 | in the foreground, the user will not be able to ctrl-c to get | |
682 | back the terminal, effectively hanging the debug session. */ | |
683 | fprintf_filtered (gdb_stderr, _("\ | |
684 | Can not resume the parent process over vfork in the foreground while \n\ | |
685 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
686 | \"set schedule-multiple\".\n")); | |
687 | return 1; | |
688 | } | |
689 | ||
4de4c07c DJ |
690 | if (! follow_child) |
691 | { | |
6c95b8df | 692 | struct lwp_info *child_lp = NULL; |
4de4c07c | 693 | |
6c95b8df | 694 | /* We're already attached to the parent, by default. */ |
4de4c07c | 695 | |
ac264b3b MS |
696 | /* Detach new forked process? */ |
697 | if (detach_fork) | |
f75c00e4 | 698 | { |
6c95b8df PA |
699 | /* Before detaching from the child, remove all breakpoints |
700 | from it. If we forked, then this has already been taken | |
701 | care of by infrun.c. If we vforked however, any | |
702 | breakpoint inserted in the parent is visible in the | |
703 | child, even those added while stopped in a vfork | |
704 | catchpoint. This will remove the breakpoints from the | |
705 | parent also, but they'll be reinserted below. */ | |
706 | if (has_vforked) | |
707 | { | |
708 | /* keep breakpoints list in sync. */ | |
709 | remove_breakpoints_pid (GET_PID (inferior_ptid)); | |
710 | } | |
711 | ||
e85a822c | 712 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
713 | { |
714 | target_terminal_ours (); | |
715 | fprintf_filtered (gdb_stdlog, | |
716 | "Detaching after fork from child process %d.\n", | |
717 | child_pid); | |
718 | } | |
4de4c07c | 719 | |
ac264b3b MS |
720 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
721 | } | |
722 | else | |
723 | { | |
77435e4c | 724 | struct inferior *parent_inf, *child_inf; |
2277426b | 725 | struct cleanup *old_chain; |
7f9f62ba PA |
726 | |
727 | /* Add process to GDB's tables. */ | |
77435e4c PA |
728 | child_inf = add_inferior (child_pid); |
729 | ||
e58b0e63 | 730 | parent_inf = current_inferior (); |
77435e4c | 731 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 732 | copy_terminal_info (child_inf, parent_inf); |
7f9f62ba | 733 | |
2277426b | 734 | old_chain = save_inferior_ptid (); |
6c95b8df | 735 | save_current_program_space (); |
2277426b PA |
736 | |
737 | inferior_ptid = ptid_build (child_pid, child_pid, 0); | |
738 | add_thread (inferior_ptid); | |
6c95b8df PA |
739 | child_lp = add_lwp (inferior_ptid); |
740 | child_lp->stopped = 1; | |
741 | child_lp->resumed = 1; | |
2277426b | 742 | |
6c95b8df PA |
743 | /* If this is a vfork child, then the address-space is |
744 | shared with the parent. */ | |
745 | if (has_vforked) | |
746 | { | |
747 | child_inf->pspace = parent_inf->pspace; | |
748 | child_inf->aspace = parent_inf->aspace; | |
749 | ||
750 | /* The parent will be frozen until the child is done | |
751 | with the shared region. Keep track of the | |
752 | parent. */ | |
753 | child_inf->vfork_parent = parent_inf; | |
754 | child_inf->pending_detach = 0; | |
755 | parent_inf->vfork_child = child_inf; | |
756 | parent_inf->pending_detach = 0; | |
757 | } | |
758 | else | |
759 | { | |
760 | child_inf->aspace = new_address_space (); | |
761 | child_inf->pspace = add_program_space (child_inf->aspace); | |
762 | child_inf->removable = 1; | |
763 | set_current_program_space (child_inf->pspace); | |
764 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
765 | ||
766 | /* Let the shared library layer (solib-svr4) learn about | |
767 | this new process, relocate the cloned exec, pull in | |
768 | shared libraries, and install the solib event | |
769 | breakpoint. If a "cloned-VM" event was propagated | |
770 | better throughout the core, this wouldn't be | |
771 | required. */ | |
772 | solib_create_inferior_hook (); | |
773 | } | |
774 | ||
775 | /* Let the thread_db layer learn about this new process. */ | |
2277426b PA |
776 | check_for_thread_db (); |
777 | ||
778 | do_cleanups (old_chain); | |
ac264b3b | 779 | } |
9016a515 DJ |
780 | |
781 | if (has_vforked) | |
782 | { | |
6c95b8df PA |
783 | struct lwp_info *lp; |
784 | struct inferior *parent_inf; | |
785 | ||
786 | parent_inf = current_inferior (); | |
787 | ||
788 | /* If we detached from the child, then we have to be careful | |
789 | to not insert breakpoints in the parent until the child | |
790 | is done with the shared memory region. However, if we're | |
791 | staying attached to the child, then we can and should | |
792 | insert breakpoints, so that we can debug it. A | |
793 | subsequent child exec or exit is enough to know when does | |
794 | the child stops using the parent's address space. */ | |
795 | parent_inf->waiting_for_vfork_done = detach_fork; | |
796 | ||
797 | lp = find_lwp_pid (pid_to_ptid (parent_pid)); | |
b957e937 DJ |
798 | gdb_assert (linux_supports_tracefork_flag >= 0); |
799 | if (linux_supports_tracevforkdone (0)) | |
9016a515 | 800 | { |
6c95b8df PA |
801 | if (debug_linux_nat) |
802 | fprintf_unfiltered (gdb_stdlog, | |
803 | "LCFF: waiting for VFORK_DONE on %d\n", | |
804 | parent_pid); | |
805 | ||
806 | lp->stopped = 1; | |
807 | lp->resumed = 1; | |
9016a515 | 808 | |
6c95b8df PA |
809 | /* We'll handle the VFORK_DONE event like any other |
810 | event, in target_wait. */ | |
9016a515 DJ |
811 | } |
812 | else | |
813 | { | |
814 | /* We can't insert breakpoints until the child has | |
815 | finished with the shared memory region. We need to | |
816 | wait until that happens. Ideal would be to just | |
817 | call: | |
818 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
819 | - waitpid (parent_pid, &status, __WALL); | |
820 | However, most architectures can't handle a syscall | |
821 | being traced on the way out if it wasn't traced on | |
822 | the way in. | |
823 | ||
824 | We might also think to loop, continuing the child | |
825 | until it exits or gets a SIGTRAP. One problem is | |
826 | that the child might call ptrace with PTRACE_TRACEME. | |
827 | ||
828 | There's no simple and reliable way to figure out when | |
829 | the vforked child will be done with its copy of the | |
830 | shared memory. We could step it out of the syscall, | |
831 | two instructions, let it go, and then single-step the | |
832 | parent once. When we have hardware single-step, this | |
833 | would work; with software single-step it could still | |
834 | be made to work but we'd have to be able to insert | |
835 | single-step breakpoints in the child, and we'd have | |
836 | to insert -just- the single-step breakpoint in the | |
837 | parent. Very awkward. | |
838 | ||
839 | In the end, the best we can do is to make sure it | |
840 | runs for a little while. Hopefully it will be out of | |
841 | range of any breakpoints we reinsert. Usually this | |
842 | is only the single-step breakpoint at vfork's return | |
843 | point. */ | |
844 | ||
6c95b8df PA |
845 | if (debug_linux_nat) |
846 | fprintf_unfiltered (gdb_stdlog, | |
847 | "LCFF: no VFORK_DONE support, sleeping a bit\n"); | |
848 | ||
9016a515 | 849 | usleep (10000); |
9016a515 | 850 | |
6c95b8df PA |
851 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
852 | and leave it pending. The next linux_nat_resume call | |
853 | will notice a pending event, and bypasses actually | |
854 | resuming the inferior. */ | |
855 | lp->status = 0; | |
856 | lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
857 | lp->stopped = 0; | |
858 | lp->resumed = 1; | |
859 | ||
860 | /* If we're in async mode, need to tell the event loop | |
861 | there's something here to process. */ | |
862 | if (target_can_async_p ()) | |
863 | async_file_mark (); | |
864 | } | |
9016a515 | 865 | } |
4de4c07c | 866 | } |
3993f6b1 | 867 | else |
4de4c07c | 868 | { |
4e1c45ea | 869 | struct thread_info *tp; |
77435e4c | 870 | struct inferior *parent_inf, *child_inf; |
2277426b | 871 | struct lwp_info *lp; |
6c95b8df | 872 | struct program_space *parent_pspace; |
4de4c07c | 873 | |
e85a822c | 874 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
875 | { |
876 | target_terminal_ours (); | |
6c95b8df PA |
877 | if (has_vforked) |
878 | fprintf_filtered (gdb_stdlog, _("\ | |
879 | Attaching after process %d vfork to child process %d.\n"), | |
880 | parent_pid, child_pid); | |
881 | else | |
882 | fprintf_filtered (gdb_stdlog, _("\ | |
883 | Attaching after process %d fork to child process %d.\n"), | |
884 | parent_pid, child_pid); | |
f75c00e4 | 885 | } |
4de4c07c | 886 | |
7a7d3353 PA |
887 | /* Add the new inferior first, so that the target_detach below |
888 | doesn't unpush the target. */ | |
889 | ||
77435e4c PA |
890 | child_inf = add_inferior (child_pid); |
891 | ||
e58b0e63 | 892 | parent_inf = current_inferior (); |
77435e4c | 893 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 894 | copy_terminal_info (child_inf, parent_inf); |
7a7d3353 | 895 | |
6c95b8df | 896 | parent_pspace = parent_inf->pspace; |
9016a515 | 897 | |
6c95b8df PA |
898 | /* If we're vforking, we want to hold on to the parent until the |
899 | child exits or execs. At child exec or exit time we can | |
900 | remove the old breakpoints from the parent and detach or | |
901 | resume debugging it. Otherwise, detach the parent now; we'll | |
902 | want to reuse it's program/address spaces, but we can't set | |
903 | them to the child before removing breakpoints from the | |
904 | parent, otherwise, the breakpoints module could decide to | |
905 | remove breakpoints from the wrong process (since they'd be | |
906 | assigned to the same address space). */ | |
9016a515 DJ |
907 | |
908 | if (has_vforked) | |
7f9f62ba | 909 | { |
6c95b8df PA |
910 | gdb_assert (child_inf->vfork_parent == NULL); |
911 | gdb_assert (parent_inf->vfork_child == NULL); | |
912 | child_inf->vfork_parent = parent_inf; | |
913 | child_inf->pending_detach = 0; | |
914 | parent_inf->vfork_child = child_inf; | |
915 | parent_inf->pending_detach = detach_fork; | |
916 | parent_inf->waiting_for_vfork_done = 0; | |
ac264b3b | 917 | } |
2277426b | 918 | else if (detach_fork) |
b84876c2 | 919 | target_detach (NULL, 0); |
4de4c07c | 920 | |
6c95b8df PA |
921 | /* Note that the detach above makes PARENT_INF dangling. */ |
922 | ||
923 | /* Add the child thread to the appropriate lists, and switch to | |
924 | this new thread, before cloning the program space, and | |
925 | informing the solib layer about this new process. */ | |
926 | ||
9f0bdab8 | 927 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
2277426b PA |
928 | add_thread (inferior_ptid); |
929 | lp = add_lwp (inferior_ptid); | |
930 | lp->stopped = 1; | |
6c95b8df PA |
931 | lp->resumed = 1; |
932 | ||
933 | /* If this is a vfork child, then the address-space is shared | |
934 | with the parent. If we detached from the parent, then we can | |
935 | reuse the parent's program/address spaces. */ | |
936 | if (has_vforked || detach_fork) | |
937 | { | |
938 | child_inf->pspace = parent_pspace; | |
939 | child_inf->aspace = child_inf->pspace->aspace; | |
940 | } | |
941 | else | |
942 | { | |
943 | child_inf->aspace = new_address_space (); | |
944 | child_inf->pspace = add_program_space (child_inf->aspace); | |
945 | child_inf->removable = 1; | |
946 | set_current_program_space (child_inf->pspace); | |
947 | clone_program_space (child_inf->pspace, parent_pspace); | |
948 | ||
949 | /* Let the shared library layer (solib-svr4) learn about | |
950 | this new process, relocate the cloned exec, pull in | |
951 | shared libraries, and install the solib event breakpoint. | |
952 | If a "cloned-VM" event was propagated better throughout | |
953 | the core, this wouldn't be required. */ | |
954 | solib_create_inferior_hook (); | |
955 | } | |
ac264b3b | 956 | |
6c95b8df | 957 | /* Let the thread_db layer learn about this new process. */ |
ef29ce1a | 958 | check_for_thread_db (); |
4de4c07c DJ |
959 | } |
960 | ||
7feb7d06 | 961 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
962 | return 0; |
963 | } | |
964 | ||
4de4c07c | 965 | \f |
6d8fd2b7 UW |
966 | static void |
967 | linux_child_insert_fork_catchpoint (int pid) | |
4de4c07c | 968 | { |
b957e937 | 969 | if (! linux_supports_tracefork (pid)) |
8a3fe4f8 | 970 | error (_("Your system does not support fork catchpoints.")); |
3993f6b1 DJ |
971 | } |
972 | ||
6d8fd2b7 UW |
973 | static void |
974 | linux_child_insert_vfork_catchpoint (int pid) | |
3993f6b1 | 975 | { |
b957e937 | 976 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 977 | error (_("Your system does not support vfork catchpoints.")); |
3993f6b1 DJ |
978 | } |
979 | ||
6d8fd2b7 UW |
980 | static void |
981 | linux_child_insert_exec_catchpoint (int pid) | |
3993f6b1 | 982 | { |
b957e937 | 983 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 984 | error (_("Your system does not support exec catchpoints.")); |
3993f6b1 DJ |
985 | } |
986 | ||
a96d9b2e SDJ |
987 | static int |
988 | linux_child_set_syscall_catchpoint (int pid, int needed, int any_count, | |
989 | int table_size, int *table) | |
990 | { | |
991 | if (! linux_supports_tracesysgood (pid)) | |
992 | error (_("Your system does not support syscall catchpoints.")); | |
993 | /* On GNU/Linux, we ignore the arguments. It means that we only | |
994 | enable the syscall catchpoints, but do not disable them. | |
995 | ||
996 | Also, we do not use the `table' information because we do not | |
997 | filter system calls here. We let GDB do the logic for us. */ | |
998 | return 0; | |
999 | } | |
1000 | ||
d6b0e80f AC |
1001 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
1002 | are processes sharing the same VM space. A multi-threaded process | |
1003 | is basically a group of such processes. However, such a grouping | |
1004 | is almost entirely a user-space issue; the kernel doesn't enforce | |
1005 | such a grouping at all (this might change in the future). In | |
1006 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
1007 | Threads library) to provide such a grouping. | |
1008 | ||
1009 | It is perfectly well possible to write a multi-threaded application | |
1010 | without the assistance of a threads library, by using the clone | |
1011 | system call directly. This module should be able to give some | |
1012 | rudimentary support for debugging such applications if developers | |
1013 | specify the CLONE_PTRACE flag in the clone system call, and are | |
1014 | using the Linux kernel 2.4 or above. | |
1015 | ||
1016 | Note that there are some peculiarities in GNU/Linux that affect | |
1017 | this code: | |
1018 | ||
1019 | - In general one should specify the __WCLONE flag to waitpid in | |
1020 | order to make it report events for any of the cloned processes | |
1021 | (and leave it out for the initial process). However, if a cloned | |
1022 | process has exited the exit status is only reported if the | |
1023 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
1024 | we cannot use it since GDB must work on older systems too. | |
1025 | ||
1026 | - When a traced, cloned process exits and is waited for by the | |
1027 | debugger, the kernel reassigns it to the original parent and | |
1028 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
1029 | library doesn't notice this, which leads to the "zombie problem": | |
1030 | When debugged a multi-threaded process that spawns a lot of | |
1031 | threads will run out of processes, even if the threads exit, | |
1032 | because the "zombies" stay around. */ | |
1033 | ||
1034 | /* List of known LWPs. */ | |
9f0bdab8 | 1035 | struct lwp_info *lwp_list; |
d6b0e80f AC |
1036 | \f |
1037 | ||
d6b0e80f AC |
1038 | /* Original signal mask. */ |
1039 | static sigset_t normal_mask; | |
1040 | ||
1041 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
1042 | _initialize_linux_nat. */ | |
1043 | static sigset_t suspend_mask; | |
1044 | ||
7feb7d06 PA |
1045 | /* Signals to block to make that sigsuspend work. */ |
1046 | static sigset_t blocked_mask; | |
1047 | ||
1048 | /* SIGCHLD action. */ | |
1049 | struct sigaction sigchld_action; | |
b84876c2 | 1050 | |
7feb7d06 PA |
1051 | /* Block child signals (SIGCHLD and linux threads signals), and store |
1052 | the previous mask in PREV_MASK. */ | |
84e46146 | 1053 | |
7feb7d06 PA |
1054 | static void |
1055 | block_child_signals (sigset_t *prev_mask) | |
1056 | { | |
1057 | /* Make sure SIGCHLD is blocked. */ | |
1058 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
1059 | sigaddset (&blocked_mask, SIGCHLD); | |
1060 | ||
1061 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
1062 | } | |
1063 | ||
1064 | /* Restore child signals mask, previously returned by | |
1065 | block_child_signals. */ | |
1066 | ||
1067 | static void | |
1068 | restore_child_signals_mask (sigset_t *prev_mask) | |
1069 | { | |
1070 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
1071 | } | |
d6b0e80f AC |
1072 | \f |
1073 | ||
1074 | /* Prototypes for local functions. */ | |
1075 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 1076 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 1077 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd PA |
1078 | static int cancel_breakpoint (struct lwp_info *lp); |
1079 | ||
d6b0e80f AC |
1080 | \f |
1081 | /* Convert wait status STATUS to a string. Used for printing debug | |
1082 | messages only. */ | |
1083 | ||
1084 | static char * | |
1085 | status_to_str (int status) | |
1086 | { | |
1087 | static char buf[64]; | |
1088 | ||
1089 | if (WIFSTOPPED (status)) | |
206aa767 | 1090 | { |
ca2163eb | 1091 | if (WSTOPSIG (status) == SYSCALL_SIGTRAP) |
206aa767 DE |
1092 | snprintf (buf, sizeof (buf), "%s (stopped at syscall)", |
1093 | strsignal (SIGTRAP)); | |
1094 | else | |
1095 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
1096 | strsignal (WSTOPSIG (status))); | |
1097 | } | |
d6b0e80f AC |
1098 | else if (WIFSIGNALED (status)) |
1099 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
1100 | strsignal (WSTOPSIG (status))); | |
1101 | else | |
1102 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
1103 | ||
1104 | return buf; | |
1105 | } | |
1106 | ||
1107 | /* Initialize the list of LWPs. Note that this module, contrary to | |
1108 | what GDB's generic threads layer does for its thread list, | |
1109 | re-initializes the LWP lists whenever we mourn or detach (which | |
1110 | doesn't involve mourning) the inferior. */ | |
1111 | ||
1112 | static void | |
1113 | init_lwp_list (void) | |
1114 | { | |
1115 | struct lwp_info *lp, *lpnext; | |
1116 | ||
1117 | for (lp = lwp_list; lp; lp = lpnext) | |
1118 | { | |
1119 | lpnext = lp->next; | |
1120 | xfree (lp); | |
1121 | } | |
1122 | ||
1123 | lwp_list = NULL; | |
d90e17a7 PA |
1124 | } |
1125 | ||
1126 | /* Remove all LWPs belong to PID from the lwp list. */ | |
1127 | ||
1128 | static void | |
1129 | purge_lwp_list (int pid) | |
1130 | { | |
1131 | struct lwp_info *lp, *lpprev, *lpnext; | |
1132 | ||
1133 | lpprev = NULL; | |
1134 | ||
1135 | for (lp = lwp_list; lp; lp = lpnext) | |
1136 | { | |
1137 | lpnext = lp->next; | |
1138 | ||
1139 | if (ptid_get_pid (lp->ptid) == pid) | |
1140 | { | |
1141 | if (lp == lwp_list) | |
1142 | lwp_list = lp->next; | |
1143 | else | |
1144 | lpprev->next = lp->next; | |
1145 | ||
1146 | xfree (lp); | |
1147 | } | |
1148 | else | |
1149 | lpprev = lp; | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | /* Return the number of known LWPs in the tgid given by PID. */ | |
1154 | ||
1155 | static int | |
1156 | num_lwps (int pid) | |
1157 | { | |
1158 | int count = 0; | |
1159 | struct lwp_info *lp; | |
1160 | ||
1161 | for (lp = lwp_list; lp; lp = lp->next) | |
1162 | if (ptid_get_pid (lp->ptid) == pid) | |
1163 | count++; | |
1164 | ||
1165 | return count; | |
d6b0e80f AC |
1166 | } |
1167 | ||
f973ed9c | 1168 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1169 | structure describing the new LWP. The LWP should already be stopped |
1170 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1171 | |
1172 | static struct lwp_info * | |
1173 | add_lwp (ptid_t ptid) | |
1174 | { | |
1175 | struct lwp_info *lp; | |
1176 | ||
1177 | gdb_assert (is_lwp (ptid)); | |
1178 | ||
1179 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1180 | ||
1181 | memset (lp, 0, sizeof (struct lwp_info)); | |
1182 | ||
1183 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1184 | ||
1185 | lp->ptid = ptid; | |
1186 | ||
1187 | lp->next = lwp_list; | |
1188 | lwp_list = lp; | |
d6b0e80f | 1189 | |
d90e17a7 | 1190 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1191 | linux_nat_new_thread (ptid); |
1192 | ||
d6b0e80f AC |
1193 | return lp; |
1194 | } | |
1195 | ||
1196 | /* Remove the LWP specified by PID from the list. */ | |
1197 | ||
1198 | static void | |
1199 | delete_lwp (ptid_t ptid) | |
1200 | { | |
1201 | struct lwp_info *lp, *lpprev; | |
1202 | ||
1203 | lpprev = NULL; | |
1204 | ||
1205 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1206 | if (ptid_equal (lp->ptid, ptid)) | |
1207 | break; | |
1208 | ||
1209 | if (!lp) | |
1210 | return; | |
1211 | ||
d6b0e80f AC |
1212 | if (lpprev) |
1213 | lpprev->next = lp->next; | |
1214 | else | |
1215 | lwp_list = lp->next; | |
1216 | ||
1217 | xfree (lp); | |
1218 | } | |
1219 | ||
1220 | /* Return a pointer to the structure describing the LWP corresponding | |
1221 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1222 | ||
1223 | static struct lwp_info * | |
1224 | find_lwp_pid (ptid_t ptid) | |
1225 | { | |
1226 | struct lwp_info *lp; | |
1227 | int lwp; | |
1228 | ||
1229 | if (is_lwp (ptid)) | |
1230 | lwp = GET_LWP (ptid); | |
1231 | else | |
1232 | lwp = GET_PID (ptid); | |
1233 | ||
1234 | for (lp = lwp_list; lp; lp = lp->next) | |
1235 | if (lwp == GET_LWP (lp->ptid)) | |
1236 | return lp; | |
1237 | ||
1238 | return NULL; | |
1239 | } | |
1240 | ||
d90e17a7 PA |
1241 | /* Returns true if PTID matches filter FILTER. FILTER can be the wild |
1242 | card MINUS_ONE_PTID (all ptid match it); can be a ptid representing | |
1243 | a process (ptid_is_pid returns true), in which case, all lwps of | |
1244 | that give process match, lwps of other process do not; or, it can | |
1245 | represent a specific thread, in which case, only that thread will | |
1246 | match true. PTID must represent an LWP, it can never be a wild | |
1247 | card. */ | |
1248 | ||
1249 | static int | |
1250 | ptid_match (ptid_t ptid, ptid_t filter) | |
1251 | { | |
1252 | /* Since both parameters have the same type, prevent easy mistakes | |
1253 | from happening. */ | |
1254 | gdb_assert (!ptid_equal (ptid, minus_one_ptid) | |
1255 | && !ptid_equal (ptid, null_ptid)); | |
1256 | ||
1257 | if (ptid_equal (filter, minus_one_ptid)) | |
1258 | return 1; | |
1259 | if (ptid_is_pid (filter) | |
1260 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
1261 | return 1; | |
1262 | else if (ptid_equal (ptid, filter)) | |
1263 | return 1; | |
1264 | ||
1265 | return 0; | |
1266 | } | |
1267 | ||
d6b0e80f AC |
1268 | /* Call CALLBACK with its second argument set to DATA for every LWP in |
1269 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1270 | pointer to the structure describing that LWP immediately. | |
1271 | Otherwise return NULL. */ | |
1272 | ||
1273 | struct lwp_info * | |
d90e17a7 PA |
1274 | iterate_over_lwps (ptid_t filter, |
1275 | int (*callback) (struct lwp_info *, void *), | |
1276 | void *data) | |
d6b0e80f AC |
1277 | { |
1278 | struct lwp_info *lp, *lpnext; | |
1279 | ||
1280 | for (lp = lwp_list; lp; lp = lpnext) | |
1281 | { | |
1282 | lpnext = lp->next; | |
d90e17a7 PA |
1283 | |
1284 | if (ptid_match (lp->ptid, filter)) | |
1285 | { | |
1286 | if ((*callback) (lp, data)) | |
1287 | return lp; | |
1288 | } | |
d6b0e80f AC |
1289 | } |
1290 | ||
1291 | return NULL; | |
1292 | } | |
1293 | ||
2277426b PA |
1294 | /* Update our internal state when changing from one checkpoint to |
1295 | another indicated by NEW_PTID. We can only switch single-threaded | |
1296 | applications, so we only create one new LWP, and the previous list | |
1297 | is discarded. */ | |
f973ed9c DJ |
1298 | |
1299 | void | |
1300 | linux_nat_switch_fork (ptid_t new_ptid) | |
1301 | { | |
1302 | struct lwp_info *lp; | |
1303 | ||
2277426b PA |
1304 | purge_lwp_list (GET_PID (inferior_ptid)); |
1305 | ||
f973ed9c DJ |
1306 | lp = add_lwp (new_ptid); |
1307 | lp->stopped = 1; | |
e26af52f | 1308 | |
2277426b PA |
1309 | /* This changes the thread's ptid while preserving the gdb thread |
1310 | num. Also changes the inferior pid, while preserving the | |
1311 | inferior num. */ | |
1312 | thread_change_ptid (inferior_ptid, new_ptid); | |
1313 | ||
1314 | /* We've just told GDB core that the thread changed target id, but, | |
1315 | in fact, it really is a different thread, with different register | |
1316 | contents. */ | |
1317 | registers_changed (); | |
e26af52f DJ |
1318 | } |
1319 | ||
e26af52f DJ |
1320 | /* Handle the exit of a single thread LP. */ |
1321 | ||
1322 | static void | |
1323 | exit_lwp (struct lwp_info *lp) | |
1324 | { | |
e09875d4 | 1325 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1326 | |
1327 | if (th) | |
e26af52f | 1328 | { |
17faa917 DJ |
1329 | if (print_thread_events) |
1330 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1331 | ||
4f8d22e3 | 1332 | delete_thread (lp->ptid); |
e26af52f DJ |
1333 | } |
1334 | ||
1335 | delete_lwp (lp->ptid); | |
1336 | } | |
1337 | ||
4d062f1a PA |
1338 | /* Return an lwp's tgid, found in `/proc/PID/status'. */ |
1339 | ||
1340 | int | |
1341 | linux_proc_get_tgid (int lwpid) | |
1342 | { | |
1343 | FILE *status_file; | |
1344 | char buf[100]; | |
1345 | int tgid = -1; | |
1346 | ||
1347 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); | |
1348 | status_file = fopen (buf, "r"); | |
1349 | if (status_file != NULL) | |
1350 | { | |
1351 | while (fgets (buf, sizeof (buf), status_file)) | |
1352 | { | |
1353 | if (strncmp (buf, "Tgid:", 5) == 0) | |
1354 | { | |
1355 | tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10); | |
1356 | break; | |
1357 | } | |
1358 | } | |
1359 | ||
1360 | fclose (status_file); | |
1361 | } | |
1362 | ||
1363 | return tgid; | |
1364 | } | |
1365 | ||
a0ef4274 DJ |
1366 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1367 | Other states including `T (tracing stop)' are reported as false. */ | |
1368 | ||
1369 | static int | |
1370 | pid_is_stopped (pid_t pid) | |
1371 | { | |
1372 | FILE *status_file; | |
1373 | char buf[100]; | |
1374 | int retval = 0; | |
1375 | ||
1376 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1377 | status_file = fopen (buf, "r"); | |
1378 | if (status_file != NULL) | |
1379 | { | |
1380 | int have_state = 0; | |
1381 | ||
1382 | while (fgets (buf, sizeof (buf), status_file)) | |
1383 | { | |
1384 | if (strncmp (buf, "State:", 6) == 0) | |
1385 | { | |
1386 | have_state = 1; | |
1387 | break; | |
1388 | } | |
1389 | } | |
1390 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1391 | retval = 1; | |
1392 | fclose (status_file); | |
1393 | } | |
1394 | return retval; | |
1395 | } | |
1396 | ||
1397 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1398 | Returns a wait status for that LWP, to cache. */ | |
1399 | ||
1400 | static int | |
1401 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1402 | int *signalled) | |
1403 | { | |
1404 | pid_t new_pid, pid = GET_LWP (ptid); | |
1405 | int status; | |
1406 | ||
1407 | if (pid_is_stopped (pid)) | |
1408 | { | |
1409 | if (debug_linux_nat) | |
1410 | fprintf_unfiltered (gdb_stdlog, | |
1411 | "LNPAW: Attaching to a stopped process\n"); | |
1412 | ||
1413 | /* The process is definitely stopped. It is in a job control | |
1414 | stop, unless the kernel predates the TASK_STOPPED / | |
1415 | TASK_TRACED distinction, in which case it might be in a | |
1416 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1417 | can kill it, signal it, et cetera. | |
1418 | ||
1419 | First make sure there is a pending SIGSTOP. Since we are | |
1420 | already attached, the process can not transition from stopped | |
1421 | to running without a PTRACE_CONT; so we know this signal will | |
1422 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1423 | probably already in the queue (unless this kernel is old | |
1424 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1425 | is not an RT signal, it can only be queued once. */ | |
1426 | kill_lwp (pid, SIGSTOP); | |
1427 | ||
1428 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1429 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1430 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1431 | } | |
1432 | ||
1433 | /* Make sure the initial process is stopped. The user-level threads | |
1434 | layer might want to poke around in the inferior, and that won't | |
1435 | work if things haven't stabilized yet. */ | |
1436 | new_pid = my_waitpid (pid, &status, 0); | |
1437 | if (new_pid == -1 && errno == ECHILD) | |
1438 | { | |
1439 | if (first) | |
1440 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1441 | ||
1442 | /* Try again with __WCLONE to check cloned processes. */ | |
1443 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1444 | *cloned = 1; | |
1445 | } | |
1446 | ||
dacc9cb2 PP |
1447 | gdb_assert (pid == new_pid); |
1448 | ||
1449 | if (!WIFSTOPPED (status)) | |
1450 | { | |
1451 | /* The pid we tried to attach has apparently just exited. */ | |
1452 | if (debug_linux_nat) | |
1453 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1454 | pid, status_to_str (status)); | |
1455 | return status; | |
1456 | } | |
a0ef4274 DJ |
1457 | |
1458 | if (WSTOPSIG (status) != SIGSTOP) | |
1459 | { | |
1460 | *signalled = 1; | |
1461 | if (debug_linux_nat) | |
1462 | fprintf_unfiltered (gdb_stdlog, | |
1463 | "LNPAW: Received %s after attaching\n", | |
1464 | status_to_str (status)); | |
1465 | } | |
1466 | ||
1467 | return status; | |
1468 | } | |
1469 | ||
1470 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1471 | if the new LWP could not be attached. */ | |
d6b0e80f | 1472 | |
9ee57c33 | 1473 | int |
93815fbf | 1474 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1475 | { |
9ee57c33 | 1476 | struct lwp_info *lp; |
7feb7d06 | 1477 | sigset_t prev_mask; |
d6b0e80f AC |
1478 | |
1479 | gdb_assert (is_lwp (ptid)); | |
1480 | ||
7feb7d06 | 1481 | block_child_signals (&prev_mask); |
d6b0e80f | 1482 | |
9ee57c33 | 1483 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1484 | |
1485 | /* We assume that we're already attached to any LWP that has an id | |
1486 | equal to the overall process id, and to any LWP that is already | |
1487 | in our list of LWPs. If we're not seeing exit events from threads | |
1488 | and we've had PID wraparound since we last tried to stop all threads, | |
1489 | this assumption might be wrong; fortunately, this is very unlikely | |
1490 | to happen. */ | |
9ee57c33 | 1491 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1492 | { |
a0ef4274 | 1493 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1494 | |
1495 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1496 | { |
1497 | /* If we fail to attach to the thread, issue a warning, | |
1498 | but continue. One way this can happen is if thread | |
e9efe249 | 1499 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1500 | bug may place threads in the thread list and then fail |
1501 | to create them. */ | |
1502 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1503 | safe_strerror (errno)); | |
7feb7d06 | 1504 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1505 | return -1; |
1506 | } | |
1507 | ||
d6b0e80f AC |
1508 | if (debug_linux_nat) |
1509 | fprintf_unfiltered (gdb_stdlog, | |
1510 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1511 | target_pid_to_str (ptid)); | |
1512 | ||
a0ef4274 | 1513 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
dacc9cb2 PP |
1514 | if (!WIFSTOPPED (status)) |
1515 | return -1; | |
1516 | ||
a0ef4274 DJ |
1517 | lp = add_lwp (ptid); |
1518 | lp->stopped = 1; | |
1519 | lp->cloned = cloned; | |
1520 | lp->signalled = signalled; | |
1521 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1522 | { |
a0ef4274 DJ |
1523 | lp->resumed = 1; |
1524 | lp->status = status; | |
d6b0e80f AC |
1525 | } |
1526 | ||
a0ef4274 | 1527 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1528 | |
1529 | if (debug_linux_nat) | |
1530 | { | |
1531 | fprintf_unfiltered (gdb_stdlog, | |
1532 | "LLAL: waitpid %s received %s\n", | |
1533 | target_pid_to_str (ptid), | |
1534 | status_to_str (status)); | |
1535 | } | |
1536 | } | |
1537 | else | |
1538 | { | |
1539 | /* We assume that the LWP representing the original process is | |
1540 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1541 | that the GNU/linux ptrace layer uses to keep track of |
1542 | threads. Note that this won't have already been done since | |
1543 | the main thread will have, we assume, been stopped by an | |
1544 | attach from a different layer. */ | |
9ee57c33 DJ |
1545 | if (lp == NULL) |
1546 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1547 | lp->stopped = 1; |
1548 | } | |
9ee57c33 | 1549 | |
7feb7d06 | 1550 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1551 | return 0; |
d6b0e80f AC |
1552 | } |
1553 | ||
b84876c2 | 1554 | static void |
136d6dae VP |
1555 | linux_nat_create_inferior (struct target_ops *ops, |
1556 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1557 | int from_tty) |
1558 | { | |
10568435 JK |
1559 | #ifdef HAVE_PERSONALITY |
1560 | int personality_orig = 0, personality_set = 0; | |
1561 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1562 | |
1563 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1564 | we have to mask the async mode. */ | |
1565 | ||
10568435 JK |
1566 | #ifdef HAVE_PERSONALITY |
1567 | if (disable_randomization) | |
1568 | { | |
1569 | errno = 0; | |
1570 | personality_orig = personality (0xffffffff); | |
1571 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1572 | { | |
1573 | personality_set = 1; | |
1574 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1575 | } | |
1576 | if (errno != 0 || (personality_set | |
1577 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1578 | warning (_("Error disabling address space randomization: %s"), | |
1579 | safe_strerror (errno)); | |
1580 | } | |
1581 | #endif /* HAVE_PERSONALITY */ | |
1582 | ||
136d6dae | 1583 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1584 | |
10568435 JK |
1585 | #ifdef HAVE_PERSONALITY |
1586 | if (personality_set) | |
1587 | { | |
1588 | errno = 0; | |
1589 | personality (personality_orig); | |
1590 | if (errno != 0) | |
1591 | warning (_("Error restoring address space randomization: %s"), | |
1592 | safe_strerror (errno)); | |
1593 | } | |
1594 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1595 | } |
1596 | ||
d6b0e80f | 1597 | static void |
136d6dae | 1598 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1599 | { |
1600 | struct lwp_info *lp; | |
d6b0e80f | 1601 | int status; |
af990527 | 1602 | ptid_t ptid; |
d6b0e80f | 1603 | |
136d6dae | 1604 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1605 | |
af990527 PA |
1606 | /* The ptrace base target adds the main thread with (pid,0,0) |
1607 | format. Decorate it with lwp info. */ | |
1608 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1609 | thread_change_ptid (inferior_ptid, ptid); | |
1610 | ||
9f0bdab8 | 1611 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1612 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1613 | |
1614 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1615 | &lp->signalled); | |
dacc9cb2 PP |
1616 | if (!WIFSTOPPED (status)) |
1617 | { | |
1618 | if (WIFEXITED (status)) | |
1619 | { | |
1620 | int exit_code = WEXITSTATUS (status); | |
1621 | ||
1622 | target_terminal_ours (); | |
1623 | target_mourn_inferior (); | |
1624 | if (exit_code == 0) | |
1625 | error (_("Unable to attach: program exited normally.")); | |
1626 | else | |
1627 | error (_("Unable to attach: program exited with code %d."), | |
1628 | exit_code); | |
1629 | } | |
1630 | else if (WIFSIGNALED (status)) | |
1631 | { | |
1632 | enum target_signal signo; | |
1633 | ||
1634 | target_terminal_ours (); | |
1635 | target_mourn_inferior (); | |
1636 | ||
1637 | signo = target_signal_from_host (WTERMSIG (status)); | |
1638 | error (_("Unable to attach: program terminated with signal " | |
1639 | "%s, %s."), | |
1640 | target_signal_to_name (signo), | |
1641 | target_signal_to_string (signo)); | |
1642 | } | |
1643 | ||
1644 | internal_error (__FILE__, __LINE__, | |
1645 | _("unexpected status %d for PID %ld"), | |
1646 | status, (long) GET_LWP (ptid)); | |
1647 | } | |
1648 | ||
a0ef4274 | 1649 | lp->stopped = 1; |
9f0bdab8 | 1650 | |
a0ef4274 | 1651 | /* Save the wait status to report later. */ |
d6b0e80f | 1652 | lp->resumed = 1; |
a0ef4274 DJ |
1653 | if (debug_linux_nat) |
1654 | fprintf_unfiltered (gdb_stdlog, | |
1655 | "LNA: waitpid %ld, saving status %s\n", | |
1656 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1657 | |
7feb7d06 PA |
1658 | lp->status = status; |
1659 | ||
1660 | if (target_can_async_p ()) | |
1661 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1662 | } |
1663 | ||
a0ef4274 DJ |
1664 | /* Get pending status of LP. */ |
1665 | static int | |
1666 | get_pending_status (struct lwp_info *lp, int *status) | |
1667 | { | |
ca2163eb PA |
1668 | enum target_signal signo = TARGET_SIGNAL_0; |
1669 | ||
1670 | /* If we paused threads momentarily, we may have stored pending | |
1671 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1672 | and GDB core hasn't seen any signal for those threads. | |
1673 | Otherwise, the last signal reported to the core is found in the | |
1674 | thread object's stop_signal. | |
1675 | ||
1676 | There's a corner case that isn't handled here at present. Only | |
1677 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1678 | stop_signal make sense as a real signal to pass to the inferior. | |
1679 | Some catchpoint related events, like | |
1680 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
1681 | to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But, | |
1682 | those traps are debug API (ptrace in our case) related and | |
1683 | induced; the inferior wouldn't see them if it wasn't being | |
1684 | traced. Hence, we should never pass them to the inferior, even | |
1685 | when set to pass state. Since this corner case isn't handled by | |
1686 | infrun.c when proceeding with a signal, for consistency, neither | |
1687 | do we handle it here (or elsewhere in the file we check for | |
1688 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1689 | this is really a corner case. */ | |
1690 | ||
1691 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
1692 | signo = TARGET_SIGNAL_0; /* a pending ptrace event, not a real signal. */ | |
1693 | else if (lp->status) | |
1694 | signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1695 | else if (non_stop && !is_executing (lp->ptid)) | |
1696 | { | |
1697 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
1698 | signo = tp->stop_signal; | |
1699 | } | |
1700 | else if (!non_stop) | |
a0ef4274 | 1701 | { |
ca2163eb PA |
1702 | struct target_waitstatus last; |
1703 | ptid_t last_ptid; | |
4c28f408 | 1704 | |
ca2163eb | 1705 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1706 | |
ca2163eb PA |
1707 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) |
1708 | { | |
e09875d4 | 1709 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
2020b7ab | 1710 | signo = tp->stop_signal; |
4c28f408 | 1711 | } |
ca2163eb | 1712 | } |
4c28f408 | 1713 | |
ca2163eb | 1714 | *status = 0; |
4c28f408 | 1715 | |
ca2163eb PA |
1716 | if (signo == TARGET_SIGNAL_0) |
1717 | { | |
1718 | if (debug_linux_nat) | |
1719 | fprintf_unfiltered (gdb_stdlog, | |
1720 | "GPT: lwp %s has no pending signal\n", | |
1721 | target_pid_to_str (lp->ptid)); | |
1722 | } | |
1723 | else if (!signal_pass_state (signo)) | |
1724 | { | |
1725 | if (debug_linux_nat) | |
1726 | fprintf_unfiltered (gdb_stdlog, "\ | |
1727 | GPT: lwp %s had signal %s, but it is in no pass state\n", | |
1728 | target_pid_to_str (lp->ptid), | |
1729 | target_signal_to_string (signo)); | |
a0ef4274 | 1730 | } |
a0ef4274 | 1731 | else |
4c28f408 | 1732 | { |
ca2163eb PA |
1733 | *status = W_STOPCODE (target_signal_to_host (signo)); |
1734 | ||
1735 | if (debug_linux_nat) | |
1736 | fprintf_unfiltered (gdb_stdlog, | |
1737 | "GPT: lwp %s has pending signal %s\n", | |
1738 | target_pid_to_str (lp->ptid), | |
1739 | target_signal_to_string (signo)); | |
4c28f408 | 1740 | } |
a0ef4274 DJ |
1741 | |
1742 | return 0; | |
1743 | } | |
1744 | ||
d6b0e80f AC |
1745 | static int |
1746 | detach_callback (struct lwp_info *lp, void *data) | |
1747 | { | |
1748 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1749 | ||
1750 | if (debug_linux_nat && lp->status) | |
1751 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1752 | strsignal (WSTOPSIG (lp->status)), | |
1753 | target_pid_to_str (lp->ptid)); | |
1754 | ||
a0ef4274 DJ |
1755 | /* If there is a pending SIGSTOP, get rid of it. */ |
1756 | if (lp->signalled) | |
d6b0e80f | 1757 | { |
d6b0e80f AC |
1758 | if (debug_linux_nat) |
1759 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1760 | "DC: Sending SIGCONT to %s\n", |
1761 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1762 | |
a0ef4274 | 1763 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1764 | lp->signalled = 0; |
d6b0e80f AC |
1765 | } |
1766 | ||
1767 | /* We don't actually detach from the LWP that has an id equal to the | |
1768 | overall process id just yet. */ | |
1769 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1770 | { | |
a0ef4274 DJ |
1771 | int status = 0; |
1772 | ||
1773 | /* Pass on any pending signal for this LWP. */ | |
1774 | get_pending_status (lp, &status); | |
1775 | ||
d6b0e80f AC |
1776 | errno = 0; |
1777 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1778 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1779 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1780 | safe_strerror (errno)); |
1781 | ||
1782 | if (debug_linux_nat) | |
1783 | fprintf_unfiltered (gdb_stdlog, | |
1784 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1785 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1786 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1787 | |
1788 | delete_lwp (lp->ptid); | |
1789 | } | |
1790 | ||
1791 | return 0; | |
1792 | } | |
1793 | ||
1794 | static void | |
136d6dae | 1795 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1796 | { |
b84876c2 | 1797 | int pid; |
a0ef4274 DJ |
1798 | int status; |
1799 | enum target_signal sig; | |
d90e17a7 PA |
1800 | struct lwp_info *main_lwp; |
1801 | ||
1802 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1803 | |
b84876c2 PA |
1804 | if (target_can_async_p ()) |
1805 | linux_nat_async (NULL, 0); | |
1806 | ||
4c28f408 PA |
1807 | /* Stop all threads before detaching. ptrace requires that the |
1808 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1809 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1810 | /* ... and wait until all of them have reported back that |
1811 | they're no longer running. */ | |
d90e17a7 | 1812 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1813 | |
d90e17a7 | 1814 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1815 | |
1816 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1817 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1818 | ||
1819 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1820 | |
a0ef4274 DJ |
1821 | /* Pass on any pending signal for the last LWP. */ |
1822 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1823 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1824 | && WIFSTOPPED (status)) |
1825 | { | |
1826 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1827 | pass it along with PTRACE_DETACH. */ | |
1828 | args = alloca (8); | |
1829 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
1830 | fprintf_unfiltered (gdb_stdlog, | |
1831 | "LND: Sending signal %s to %s\n", | |
1832 | args, | |
d90e17a7 | 1833 | target_pid_to_str (main_lwp->ptid)); |
a0ef4274 DJ |
1834 | } |
1835 | ||
d90e17a7 | 1836 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1837 | |
7a7d3353 PA |
1838 | if (forks_exist_p ()) |
1839 | { | |
1840 | /* Multi-fork case. The current inferior_ptid is being detached | |
1841 | from, but there are other viable forks to debug. Detach from | |
1842 | the current fork, and context-switch to the first | |
1843 | available. */ | |
1844 | linux_fork_detach (args, from_tty); | |
1845 | ||
1846 | if (non_stop && target_can_async_p ()) | |
1847 | target_async (inferior_event_handler, 0); | |
1848 | } | |
1849 | else | |
1850 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1851 | } |
1852 | ||
1853 | /* Resume LP. */ | |
1854 | ||
1855 | static int | |
1856 | resume_callback (struct lwp_info *lp, void *data) | |
1857 | { | |
6c95b8df PA |
1858 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
1859 | ||
1860 | if (lp->stopped && inf->vfork_child != NULL) | |
1861 | { | |
1862 | if (debug_linux_nat) | |
1863 | fprintf_unfiltered (gdb_stdlog, | |
1864 | "RC: Not resuming %s (vfork parent)\n", | |
1865 | target_pid_to_str (lp->ptid)); | |
1866 | } | |
1867 | else if (lp->stopped && lp->status == 0) | |
d6b0e80f | 1868 | { |
d90e17a7 PA |
1869 | if (debug_linux_nat) |
1870 | fprintf_unfiltered (gdb_stdlog, | |
1871 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", | |
1872 | target_pid_to_str (lp->ptid)); | |
1873 | ||
28439f5e PA |
1874 | linux_ops->to_resume (linux_ops, |
1875 | pid_to_ptid (GET_LWP (lp->ptid)), | |
10d6c8cd | 1876 | 0, TARGET_SIGNAL_0); |
d6b0e80f AC |
1877 | if (debug_linux_nat) |
1878 | fprintf_unfiltered (gdb_stdlog, | |
1879 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1880 | target_pid_to_str (lp->ptid)); | |
1881 | lp->stopped = 0; | |
1882 | lp->step = 0; | |
9f0bdab8 | 1883 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
d6b0e80f | 1884 | } |
57380f4e DJ |
1885 | else if (lp->stopped && debug_linux_nat) |
1886 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (has pending)\n", | |
1887 | target_pid_to_str (lp->ptid)); | |
1888 | else if (debug_linux_nat) | |
1889 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (not stopped)\n", | |
1890 | target_pid_to_str (lp->ptid)); | |
d6b0e80f AC |
1891 | |
1892 | return 0; | |
1893 | } | |
1894 | ||
1895 | static int | |
1896 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1897 | { | |
1898 | lp->resumed = 0; | |
1899 | return 0; | |
1900 | } | |
1901 | ||
1902 | static int | |
1903 | resume_set_callback (struct lwp_info *lp, void *data) | |
1904 | { | |
1905 | lp->resumed = 1; | |
1906 | return 0; | |
1907 | } | |
1908 | ||
1909 | static void | |
28439f5e PA |
1910 | linux_nat_resume (struct target_ops *ops, |
1911 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1912 | { |
7feb7d06 | 1913 | sigset_t prev_mask; |
d6b0e80f | 1914 | struct lwp_info *lp; |
d90e17a7 | 1915 | int resume_many; |
d6b0e80f | 1916 | |
76f50ad1 DJ |
1917 | if (debug_linux_nat) |
1918 | fprintf_unfiltered (gdb_stdlog, | |
1919 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1920 | step ? "step" : "resume", | |
1921 | target_pid_to_str (ptid), | |
1922 | signo ? strsignal (signo) : "0", | |
1923 | target_pid_to_str (inferior_ptid)); | |
1924 | ||
7feb7d06 | 1925 | block_child_signals (&prev_mask); |
b84876c2 | 1926 | |
d6b0e80f | 1927 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1928 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1929 | || ptid_is_pid (ptid)); | |
4c28f408 PA |
1930 | |
1931 | if (!non_stop) | |
1932 | { | |
d90e17a7 PA |
1933 | /* Mark the lwps we're resuming as resumed. */ |
1934 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
1935 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
4c28f408 | 1936 | } |
d90e17a7 PA |
1937 | else |
1938 | iterate_over_lwps (minus_one_ptid, resume_set_callback, NULL); | |
d6b0e80f | 1939 | |
d90e17a7 PA |
1940 | /* See if it's the current inferior that should be handled |
1941 | specially. */ | |
1942 | if (resume_many) | |
1943 | lp = find_lwp_pid (inferior_ptid); | |
1944 | else | |
1945 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1946 | gdb_assert (lp != NULL); |
d6b0e80f | 1947 | |
9f0bdab8 DJ |
1948 | /* Remember if we're stepping. */ |
1949 | lp->step = step; | |
d6b0e80f | 1950 | |
9f0bdab8 DJ |
1951 | /* If we have a pending wait status for this thread, there is no |
1952 | point in resuming the process. But first make sure that | |
1953 | linux_nat_wait won't preemptively handle the event - we | |
1954 | should never take this short-circuit if we are going to | |
1955 | leave LP running, since we have skipped resuming all the | |
1956 | other threads. This bit of code needs to be synchronized | |
1957 | with linux_nat_wait. */ | |
76f50ad1 | 1958 | |
9f0bdab8 DJ |
1959 | if (lp->status && WIFSTOPPED (lp->status)) |
1960 | { | |
d6b48e9c PA |
1961 | int saved_signo; |
1962 | struct inferior *inf; | |
76f50ad1 | 1963 | |
d90e17a7 | 1964 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); |
d6b48e9c PA |
1965 | gdb_assert (inf); |
1966 | saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1967 | ||
1968 | /* Defer to common code if we're gaining control of the | |
1969 | inferior. */ | |
1970 | if (inf->stop_soon == NO_STOP_QUIETLY | |
1971 | && signal_stop_state (saved_signo) == 0 | |
9f0bdab8 DJ |
1972 | && signal_print_state (saved_signo) == 0 |
1973 | && signal_pass_state (saved_signo) == 1) | |
d6b0e80f | 1974 | { |
9f0bdab8 DJ |
1975 | if (debug_linux_nat) |
1976 | fprintf_unfiltered (gdb_stdlog, | |
1977 | "LLR: Not short circuiting for ignored " | |
1978 | "status 0x%x\n", lp->status); | |
1979 | ||
d6b0e80f AC |
1980 | /* FIXME: What should we do if we are supposed to continue |
1981 | this thread with a signal? */ | |
1982 | gdb_assert (signo == TARGET_SIGNAL_0); | |
9f0bdab8 DJ |
1983 | signo = saved_signo; |
1984 | lp->status = 0; | |
1985 | } | |
1986 | } | |
76f50ad1 | 1987 | |
6c95b8df | 1988 | if (lp->status || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
9f0bdab8 DJ |
1989 | { |
1990 | /* FIXME: What should we do if we are supposed to continue | |
1991 | this thread with a signal? */ | |
1992 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1993 | |
9f0bdab8 DJ |
1994 | if (debug_linux_nat) |
1995 | fprintf_unfiltered (gdb_stdlog, | |
1996 | "LLR: Short circuiting for status 0x%x\n", | |
1997 | lp->status); | |
d6b0e80f | 1998 | |
7feb7d06 PA |
1999 | restore_child_signals_mask (&prev_mask); |
2000 | if (target_can_async_p ()) | |
2001 | { | |
2002 | target_async (inferior_event_handler, 0); | |
2003 | /* Tell the event loop we have something to process. */ | |
2004 | async_file_mark (); | |
2005 | } | |
9f0bdab8 | 2006 | return; |
d6b0e80f AC |
2007 | } |
2008 | ||
9f0bdab8 DJ |
2009 | /* Mark LWP as not stopped to prevent it from being continued by |
2010 | resume_callback. */ | |
2011 | lp->stopped = 0; | |
2012 | ||
d90e17a7 PA |
2013 | if (resume_many) |
2014 | iterate_over_lwps (ptid, resume_callback, NULL); | |
2015 | ||
2016 | /* Convert to something the lower layer understands. */ | |
2017 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 2018 | |
28439f5e | 2019 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 DJ |
2020 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
2021 | ||
d6b0e80f AC |
2022 | if (debug_linux_nat) |
2023 | fprintf_unfiltered (gdb_stdlog, | |
2024 | "LLR: %s %s, %s (resume event thread)\n", | |
2025 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2026 | target_pid_to_str (ptid), | |
2027 | signo ? strsignal (signo) : "0"); | |
b84876c2 | 2028 | |
7feb7d06 | 2029 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 2030 | if (target_can_async_p ()) |
8ea051c5 | 2031 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
2032 | } |
2033 | ||
2034 | /* Issue kill to specified lwp. */ | |
2035 | ||
2036 | static int tkill_failed; | |
2037 | ||
2038 | static int | |
2039 | kill_lwp (int lwpid, int signo) | |
2040 | { | |
2041 | errno = 0; | |
2042 | ||
2043 | /* Use tkill, if possible, in case we are using nptl threads. If tkill | |
2044 | fails, then we are not using nptl threads and we should be using kill. */ | |
2045 | ||
2046 | #ifdef HAVE_TKILL_SYSCALL | |
2047 | if (!tkill_failed) | |
2048 | { | |
2049 | int ret = syscall (__NR_tkill, lwpid, signo); | |
2050 | if (errno != ENOSYS) | |
2051 | return ret; | |
2052 | errno = 0; | |
2053 | tkill_failed = 1; | |
2054 | } | |
2055 | #endif | |
2056 | ||
2057 | return kill (lwpid, signo); | |
2058 | } | |
2059 | ||
ca2163eb PA |
2060 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
2061 | event, check if the core is interested in it: if not, ignore the | |
2062 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
2063 | syscall entry/exit status, since the ptrace event itself doesn't | |
2064 | indicate it, and report the trap to higher layers. */ | |
2065 | ||
2066 | static int | |
2067 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
2068 | { | |
2069 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2070 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
2071 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2072 | ||
2073 | if (stopping) | |
2074 | { | |
2075 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
2076 | makes it so that the LWP reports an immediate syscall return, | |
2077 | followed by the SIGSTOP. Skip seeing that "return" using | |
2078 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
2079 | SIGSTOP. Later when the thread is resumed, a new syscall | |
2080 | entry event. If we didn't do this (and returned 0), we'd | |
2081 | leave a syscall entry pending, and our caller, by using | |
2082 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
2083 | itself. Later, when the user re-resumes this LWP, we'd see | |
2084 | another syscall entry event and we'd mistake it for a return. | |
2085 | ||
2086 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
2087 | (leaving immediately with LWP->signalled set, without issuing | |
2088 | a PTRACE_CONT), it would still be problematic to leave this | |
2089 | syscall enter pending, as later when the thread is resumed, | |
2090 | it would then see the same syscall exit mentioned above, | |
2091 | followed by the delayed SIGSTOP, while the syscall didn't | |
2092 | actually get to execute. It seems it would be even more | |
2093 | confusing to the user. */ | |
2094 | ||
2095 | if (debug_linux_nat) | |
2096 | fprintf_unfiltered (gdb_stdlog, | |
2097 | "LHST: ignoring syscall %d " | |
2098 | "for LWP %ld (stopping threads), " | |
2099 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
2100 | syscall_number, | |
2101 | GET_LWP (lp->ptid)); | |
2102 | ||
2103 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2104 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2105 | return 1; | |
2106 | } | |
2107 | ||
2108 | if (catch_syscall_enabled ()) | |
2109 | { | |
2110 | /* Always update the entry/return state, even if this particular | |
2111 | syscall isn't interesting to the core now. In async mode, | |
2112 | the user could install a new catchpoint for this syscall | |
2113 | between syscall enter/return, and we'll need to know to | |
2114 | report a syscall return if that happens. */ | |
2115 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2116 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2117 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2118 | ||
2119 | if (catching_syscall_number (syscall_number)) | |
2120 | { | |
2121 | /* Alright, an event to report. */ | |
2122 | ourstatus->kind = lp->syscall_state; | |
2123 | ourstatus->value.syscall_number = syscall_number; | |
2124 | ||
2125 | if (debug_linux_nat) | |
2126 | fprintf_unfiltered (gdb_stdlog, | |
2127 | "LHST: stopping for %s of syscall %d" | |
2128 | " for LWP %ld\n", | |
2129 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2130 | ? "entry" : "return", | |
2131 | syscall_number, | |
2132 | GET_LWP (lp->ptid)); | |
2133 | return 0; | |
2134 | } | |
2135 | ||
2136 | if (debug_linux_nat) | |
2137 | fprintf_unfiltered (gdb_stdlog, | |
2138 | "LHST: ignoring %s of syscall %d " | |
2139 | "for LWP %ld\n", | |
2140 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2141 | ? "entry" : "return", | |
2142 | syscall_number, | |
2143 | GET_LWP (lp->ptid)); | |
2144 | } | |
2145 | else | |
2146 | { | |
2147 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
2148 | before on this LWP, it could happen that the user removes all | |
2149 | syscall catchpoints before we get to process this event. | |
2150 | There are two noteworthy issues here: | |
2151 | ||
2152 | - When stopped at a syscall entry event, resuming with | |
2153 | PT_STEP still resumes executing the syscall and reports a | |
2154 | syscall return. | |
2155 | ||
2156 | - Only PT_SYSCALL catches syscall enters. If we last | |
2157 | single-stepped this thread, then this event can't be a | |
2158 | syscall enter. If we last single-stepped this thread, this | |
2159 | has to be a syscall exit. | |
2160 | ||
2161 | The points above mean that the next resume, be it PT_STEP or | |
2162 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
2163 | if (debug_linux_nat) | |
2164 | fprintf_unfiltered (gdb_stdlog, | |
2165 | "LHST: caught syscall event with no syscall catchpoints." | |
2166 | " %d for LWP %ld, ignoring\n", | |
2167 | syscall_number, | |
2168 | GET_LWP (lp->ptid)); | |
2169 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2170 | } | |
2171 | ||
2172 | /* The core isn't interested in this event. For efficiency, avoid | |
2173 | stopping all threads only to have the core resume them all again. | |
2174 | Since we're not stopping threads, if we're still syscall tracing | |
2175 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
2176 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
2177 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
2178 | ||
2179 | /* Note that gdbarch_get_syscall_number may access registers, hence | |
2180 | fill a regcache. */ | |
2181 | registers_changed (); | |
2182 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
2183 | lp->step, TARGET_SIGNAL_0); | |
2184 | return 1; | |
2185 | } | |
2186 | ||
3d799a95 DJ |
2187 | /* Handle a GNU/Linux extended wait response. If we see a clone |
2188 | event, we need to add the new LWP to our list (and not report the | |
2189 | trap to higher layers). This function returns non-zero if the | |
2190 | event should be ignored and we should wait again. If STOPPING is | |
2191 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
2192 | |
2193 | static int | |
3d799a95 DJ |
2194 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
2195 | int stopping) | |
d6b0e80f | 2196 | { |
3d799a95 DJ |
2197 | int pid = GET_LWP (lp->ptid); |
2198 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2199 | struct lwp_info *new_lp = NULL; | |
2200 | int event = status >> 16; | |
d6b0e80f | 2201 | |
3d799a95 DJ |
2202 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
2203 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 2204 | { |
3d799a95 DJ |
2205 | unsigned long new_pid; |
2206 | int ret; | |
2207 | ||
2208 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 2209 | |
3d799a95 DJ |
2210 | /* If we haven't already seen the new PID stop, wait for it now. */ |
2211 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
2212 | { | |
2213 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
2214 | hits the SIGSTOP, but we're already attached. */ | |
2215 | ret = my_waitpid (new_pid, &status, | |
2216 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
2217 | if (ret == -1) | |
2218 | perror_with_name (_("waiting for new child")); | |
2219 | else if (ret != new_pid) | |
2220 | internal_error (__FILE__, __LINE__, | |
2221 | _("wait returned unexpected PID %d"), ret); | |
2222 | else if (!WIFSTOPPED (status)) | |
2223 | internal_error (__FILE__, __LINE__, | |
2224 | _("wait returned unexpected status 0x%x"), status); | |
2225 | } | |
2226 | ||
3a3e9ee3 | 2227 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2228 | |
2277426b PA |
2229 | if (event == PTRACE_EVENT_FORK |
2230 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
2231 | { | |
2232 | struct fork_info *fp; | |
2233 | ||
2234 | /* Handle checkpointing by linux-fork.c here as a special | |
2235 | case. We don't want the follow-fork-mode or 'catch fork' | |
2236 | to interfere with this. */ | |
2237 | ||
2238 | /* This won't actually modify the breakpoint list, but will | |
2239 | physically remove the breakpoints from the child. */ | |
2240 | detach_breakpoints (new_pid); | |
2241 | ||
2242 | /* Retain child fork in ptrace (stopped) state. */ | |
2243 | fp = find_fork_pid (new_pid); | |
2244 | if (!fp) | |
2245 | fp = add_fork (new_pid); | |
2246 | ||
2247 | /* Report as spurious, so that infrun doesn't want to follow | |
2248 | this fork. We're actually doing an infcall in | |
2249 | linux-fork.c. */ | |
2250 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2251 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
2252 | ||
2253 | /* Report the stop to the core. */ | |
2254 | return 0; | |
2255 | } | |
2256 | ||
3d799a95 DJ |
2257 | if (event == PTRACE_EVENT_FORK) |
2258 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2259 | else if (event == PTRACE_EVENT_VFORK) | |
2260 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 2261 | else |
3d799a95 | 2262 | { |
4c28f408 PA |
2263 | struct cleanup *old_chain; |
2264 | ||
3d799a95 | 2265 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
d90e17a7 | 2266 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 2267 | new_lp->cloned = 1; |
4c28f408 | 2268 | new_lp->stopped = 1; |
d6b0e80f | 2269 | |
3d799a95 DJ |
2270 | if (WSTOPSIG (status) != SIGSTOP) |
2271 | { | |
2272 | /* This can happen if someone starts sending signals to | |
2273 | the new thread before it gets a chance to run, which | |
2274 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2275 | This is an unlikely case, and harder to handle for | |
2276 | fork / vfork than for clone, so we do not try - but | |
2277 | we handle it for clone events here. We'll send | |
2278 | the other signal on to the thread below. */ | |
2279 | ||
2280 | new_lp->signalled = 1; | |
2281 | } | |
2282 | else | |
2283 | status = 0; | |
d6b0e80f | 2284 | |
4c28f408 | 2285 | if (non_stop) |
3d799a95 | 2286 | { |
4c28f408 PA |
2287 | /* Add the new thread to GDB's lists as soon as possible |
2288 | so that: | |
2289 | ||
2290 | 1) the frontend doesn't have to wait for a stop to | |
2291 | display them, and, | |
2292 | ||
2293 | 2) we tag it with the correct running state. */ | |
2294 | ||
2295 | /* If the thread_db layer is active, let it know about | |
2296 | this new thread, and add it to GDB's list. */ | |
2297 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2298 | { | |
2299 | /* We're not using thread_db. Add it to GDB's | |
2300 | list. */ | |
2301 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2302 | add_thread (new_lp->ptid); | |
2303 | } | |
2304 | ||
2305 | if (!stopping) | |
2306 | { | |
2307 | set_running (new_lp->ptid, 1); | |
2308 | set_executing (new_lp->ptid, 1); | |
2309 | } | |
2310 | } | |
2311 | ||
ca2163eb PA |
2312 | /* Note the need to use the low target ops to resume, to |
2313 | handle resuming with PT_SYSCALL if we have syscall | |
2314 | catchpoints. */ | |
4c28f408 PA |
2315 | if (!stopping) |
2316 | { | |
ca2163eb PA |
2317 | int signo; |
2318 | ||
4c28f408 | 2319 | new_lp->stopped = 0; |
3d799a95 | 2320 | new_lp->resumed = 1; |
ca2163eb PA |
2321 | |
2322 | signo = (status | |
2323 | ? target_signal_from_host (WSTOPSIG (status)) | |
2324 | : TARGET_SIGNAL_0); | |
2325 | ||
2326 | linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid), | |
2327 | 0, signo); | |
3d799a95 | 2328 | } |
d6b0e80f | 2329 | |
3d799a95 DJ |
2330 | if (debug_linux_nat) |
2331 | fprintf_unfiltered (gdb_stdlog, | |
2332 | "LHEW: Got clone event from LWP %ld, resuming\n", | |
2333 | GET_LWP (lp->ptid)); | |
ca2163eb PA |
2334 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
2335 | 0, TARGET_SIGNAL_0); | |
3d799a95 DJ |
2336 | |
2337 | return 1; | |
2338 | } | |
2339 | ||
2340 | return 0; | |
d6b0e80f AC |
2341 | } |
2342 | ||
3d799a95 DJ |
2343 | if (event == PTRACE_EVENT_EXEC) |
2344 | { | |
a75724bc PA |
2345 | if (debug_linux_nat) |
2346 | fprintf_unfiltered (gdb_stdlog, | |
2347 | "LHEW: Got exec event from LWP %ld\n", | |
2348 | GET_LWP (lp->ptid)); | |
2349 | ||
3d799a95 DJ |
2350 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2351 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2352 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 | 2353 | |
6c95b8df PA |
2354 | return 0; |
2355 | } | |
2356 | ||
2357 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2358 | { | |
2359 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2360 | { |
6c95b8df PA |
2361 | if (debug_linux_nat) |
2362 | fprintf_unfiltered (gdb_stdlog, "\ | |
2363 | LHEW: Got expected PTRACE_EVENT_VFORK_DONE from LWP %ld: stopping\n", | |
2364 | GET_LWP (lp->ptid)); | |
3d799a95 | 2365 | |
6c95b8df PA |
2366 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2367 | return 0; | |
3d799a95 DJ |
2368 | } |
2369 | ||
6c95b8df PA |
2370 | if (debug_linux_nat) |
2371 | fprintf_unfiltered (gdb_stdlog, "\ | |
2372 | LHEW: Got PTRACE_EVENT_VFORK_DONE from LWP %ld: resuming\n", | |
2373 | GET_LWP (lp->ptid)); | |
2374 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2375 | return 1; | |
3d799a95 DJ |
2376 | } |
2377 | ||
2378 | internal_error (__FILE__, __LINE__, | |
2379 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2380 | } |
2381 | ||
2382 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
2383 | exited. */ | |
2384 | ||
2385 | static int | |
2386 | wait_lwp (struct lwp_info *lp) | |
2387 | { | |
2388 | pid_t pid; | |
2389 | int status; | |
2390 | int thread_dead = 0; | |
2391 | ||
2392 | gdb_assert (!lp->stopped); | |
2393 | gdb_assert (lp->status == 0); | |
2394 | ||
58aecb61 | 2395 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
2396 | if (pid == -1 && errno == ECHILD) |
2397 | { | |
58aecb61 | 2398 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
2399 | if (pid == -1 && errno == ECHILD) |
2400 | { | |
2401 | /* The thread has previously exited. We need to delete it | |
2402 | now because, for some vendor 2.4 kernels with NPTL | |
2403 | support backported, there won't be an exit event unless | |
2404 | it is the main thread. 2.6 kernels will report an exit | |
2405 | event for each thread that exits, as expected. */ | |
2406 | thread_dead = 1; | |
2407 | if (debug_linux_nat) | |
2408 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2409 | target_pid_to_str (lp->ptid)); | |
2410 | } | |
2411 | } | |
2412 | ||
2413 | if (!thread_dead) | |
2414 | { | |
2415 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2416 | ||
2417 | if (debug_linux_nat) | |
2418 | { | |
2419 | fprintf_unfiltered (gdb_stdlog, | |
2420 | "WL: waitpid %s received %s\n", | |
2421 | target_pid_to_str (lp->ptid), | |
2422 | status_to_str (status)); | |
2423 | } | |
2424 | } | |
2425 | ||
2426 | /* Check if the thread has exited. */ | |
2427 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2428 | { | |
2429 | thread_dead = 1; | |
2430 | if (debug_linux_nat) | |
2431 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2432 | target_pid_to_str (lp->ptid)); | |
2433 | } | |
2434 | ||
2435 | if (thread_dead) | |
2436 | { | |
e26af52f | 2437 | exit_lwp (lp); |
d6b0e80f AC |
2438 | return 0; |
2439 | } | |
2440 | ||
2441 | gdb_assert (WIFSTOPPED (status)); | |
2442 | ||
ca2163eb PA |
2443 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2444 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2445 | { | |
2446 | /* No longer need the sysgood bit. The ptrace event ends up | |
2447 | recorded in lp->waitstatus if we care for it. We can carry | |
2448 | on handling the event like a regular SIGTRAP from here | |
2449 | on. */ | |
2450 | status = W_STOPCODE (SIGTRAP); | |
2451 | if (linux_handle_syscall_trap (lp, 1)) | |
2452 | return wait_lwp (lp); | |
2453 | } | |
2454 | ||
d6b0e80f AC |
2455 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
2456 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2457 | { | |
2458 | if (debug_linux_nat) | |
2459 | fprintf_unfiltered (gdb_stdlog, | |
2460 | "WL: Handling extended status 0x%06x\n", | |
2461 | status); | |
3d799a95 | 2462 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2463 | return wait_lwp (lp); |
2464 | } | |
2465 | ||
2466 | return status; | |
2467 | } | |
2468 | ||
9f0bdab8 DJ |
2469 | /* Save the most recent siginfo for LP. This is currently only called |
2470 | for SIGTRAP; some ports use the si_addr field for | |
2471 | target_stopped_data_address. In the future, it may also be used to | |
2472 | restore the siginfo of requeued signals. */ | |
2473 | ||
2474 | static void | |
2475 | save_siginfo (struct lwp_info *lp) | |
2476 | { | |
2477 | errno = 0; | |
2478 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2479 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2480 | ||
2481 | if (errno != 0) | |
2482 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2483 | } | |
2484 | ||
d6b0e80f AC |
2485 | /* Send a SIGSTOP to LP. */ |
2486 | ||
2487 | static int | |
2488 | stop_callback (struct lwp_info *lp, void *data) | |
2489 | { | |
2490 | if (!lp->stopped && !lp->signalled) | |
2491 | { | |
2492 | int ret; | |
2493 | ||
2494 | if (debug_linux_nat) | |
2495 | { | |
2496 | fprintf_unfiltered (gdb_stdlog, | |
2497 | "SC: kill %s **<SIGSTOP>**\n", | |
2498 | target_pid_to_str (lp->ptid)); | |
2499 | } | |
2500 | errno = 0; | |
2501 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2502 | if (debug_linux_nat) | |
2503 | { | |
2504 | fprintf_unfiltered (gdb_stdlog, | |
2505 | "SC: lwp kill %d %s\n", | |
2506 | ret, | |
2507 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2508 | } | |
2509 | ||
2510 | lp->signalled = 1; | |
2511 | gdb_assert (lp->status == 0); | |
2512 | } | |
2513 | ||
2514 | return 0; | |
2515 | } | |
2516 | ||
57380f4e | 2517 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2518 | |
2519 | static int | |
57380f4e DJ |
2520 | linux_nat_has_pending_sigint (int pid) |
2521 | { | |
2522 | sigset_t pending, blocked, ignored; | |
2523 | int i; | |
2524 | ||
2525 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2526 | ||
2527 | if (sigismember (&pending, SIGINT) | |
2528 | && !sigismember (&ignored, SIGINT)) | |
2529 | return 1; | |
2530 | ||
2531 | return 0; | |
2532 | } | |
2533 | ||
2534 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2535 | ||
2536 | static int | |
2537 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2538 | { |
57380f4e DJ |
2539 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2540 | flag to consume the next one. */ | |
2541 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2542 | && WSTOPSIG (lp->status) == SIGINT) | |
2543 | lp->status = 0; | |
2544 | else | |
2545 | lp->ignore_sigint = 1; | |
2546 | ||
2547 | return 0; | |
2548 | } | |
2549 | ||
2550 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2551 | This function is called after we know the LWP has stopped; if the LWP | |
2552 | stopped before the expected SIGINT was delivered, then it will never have | |
2553 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2554 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2555 | |
57380f4e DJ |
2556 | static void |
2557 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2558 | { | |
2559 | if (!lp->ignore_sigint) | |
2560 | return; | |
2561 | ||
2562 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2563 | { | |
2564 | if (debug_linux_nat) | |
2565 | fprintf_unfiltered (gdb_stdlog, | |
2566 | "MCIS: Clearing bogus flag for %s\n", | |
2567 | target_pid_to_str (lp->ptid)); | |
2568 | lp->ignore_sigint = 0; | |
2569 | } | |
2570 | } | |
2571 | ||
2572 | /* Wait until LP is stopped. */ | |
2573 | ||
2574 | static int | |
2575 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2576 | { | |
6c95b8df PA |
2577 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
2578 | ||
2579 | /* If this is a vfork parent, bail out, it is not going to report | |
2580 | any SIGSTOP until the vfork is done with. */ | |
2581 | if (inf->vfork_child != NULL) | |
2582 | return 0; | |
2583 | ||
d6b0e80f AC |
2584 | if (!lp->stopped) |
2585 | { | |
2586 | int status; | |
2587 | ||
2588 | status = wait_lwp (lp); | |
2589 | if (status == 0) | |
2590 | return 0; | |
2591 | ||
57380f4e DJ |
2592 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2593 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2594 | { |
57380f4e | 2595 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2596 | |
2597 | errno = 0; | |
2598 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2599 | if (debug_linux_nat) | |
2600 | fprintf_unfiltered (gdb_stdlog, | |
57380f4e | 2601 | "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n", |
d6b0e80f AC |
2602 | target_pid_to_str (lp->ptid), |
2603 | errno ? safe_strerror (errno) : "OK"); | |
2604 | ||
57380f4e | 2605 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2606 | } |
2607 | ||
57380f4e DJ |
2608 | maybe_clear_ignore_sigint (lp); |
2609 | ||
d6b0e80f AC |
2610 | if (WSTOPSIG (status) != SIGSTOP) |
2611 | { | |
2612 | if (WSTOPSIG (status) == SIGTRAP) | |
2613 | { | |
2614 | /* If a LWP other than the LWP that we're reporting an | |
2615 | event for has hit a GDB breakpoint (as opposed to | |
2616 | some random trap signal), then just arrange for it to | |
2617 | hit it again later. We don't keep the SIGTRAP status | |
2618 | and don't forward the SIGTRAP signal to the LWP. We | |
2619 | will handle the current event, eventually we will | |
2620 | resume all LWPs, and this one will get its breakpoint | |
2621 | trap again. | |
2622 | ||
2623 | If we do not do this, then we run the risk that the | |
2624 | user will delete or disable the breakpoint, but the | |
2625 | thread will have already tripped on it. */ | |
2626 | ||
9f0bdab8 DJ |
2627 | /* Save the trap's siginfo in case we need it later. */ |
2628 | save_siginfo (lp); | |
2629 | ||
d6b0e80f AC |
2630 | /* Now resume this LWP and get the SIGSTOP event. */ |
2631 | errno = 0; | |
2632 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2633 | if (debug_linux_nat) | |
2634 | { | |
2635 | fprintf_unfiltered (gdb_stdlog, | |
2636 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2637 | target_pid_to_str (lp->ptid), | |
2638 | errno ? safe_strerror (errno) : "OK"); | |
2639 | ||
2640 | fprintf_unfiltered (gdb_stdlog, | |
2641 | "SWC: Candidate SIGTRAP event in %s\n", | |
2642 | target_pid_to_str (lp->ptid)); | |
2643 | } | |
710151dd PA |
2644 | /* Hold this event/waitstatus while we check to see if |
2645 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2646 | stop_wait_callback (lp, NULL); |
710151dd | 2647 | |
7feb7d06 PA |
2648 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2649 | there's another event, throw it back into the | |
2650 | queue. */ | |
2651 | if (lp->status) | |
710151dd | 2652 | { |
7feb7d06 PA |
2653 | if (debug_linux_nat) |
2654 | fprintf_unfiltered (gdb_stdlog, | |
2655 | "SWC: kill %s, %s\n", | |
2656 | target_pid_to_str (lp->ptid), | |
2657 | status_to_str ((int) status)); | |
2658 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2659 | } |
7feb7d06 PA |
2660 | |
2661 | /* Save the sigtrap event. */ | |
2662 | lp->status = status; | |
d6b0e80f AC |
2663 | return 0; |
2664 | } | |
2665 | else | |
2666 | { | |
2667 | /* The thread was stopped with a signal other than | |
2668 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
2669 | ||
2670 | if (debug_linux_nat) | |
2671 | { | |
2672 | fprintf_unfiltered (gdb_stdlog, | |
2673 | "SWC: Pending event %s in %s\n", | |
2674 | status_to_str ((int) status), | |
2675 | target_pid_to_str (lp->ptid)); | |
2676 | } | |
2677 | /* Now resume this LWP and get the SIGSTOP event. */ | |
2678 | errno = 0; | |
2679 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2680 | if (debug_linux_nat) | |
2681 | fprintf_unfiltered (gdb_stdlog, | |
2682 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2683 | target_pid_to_str (lp->ptid), | |
2684 | errno ? safe_strerror (errno) : "OK"); | |
2685 | ||
2686 | /* Hold this event/waitstatus while we check to see if | |
2687 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2688 | stop_wait_callback (lp, NULL); |
710151dd PA |
2689 | |
2690 | /* If the lp->status field is still empty, use it to | |
2691 | hold this event. If not, then this event must be | |
2692 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2693 | if (lp->status) |
d6b0e80f AC |
2694 | { |
2695 | if (debug_linux_nat) | |
2696 | { | |
2697 | fprintf_unfiltered (gdb_stdlog, | |
2698 | "SWC: kill %s, %s\n", | |
2699 | target_pid_to_str (lp->ptid), | |
2700 | status_to_str ((int) status)); | |
2701 | } | |
2702 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2703 | } | |
710151dd PA |
2704 | else |
2705 | lp->status = status; | |
d6b0e80f AC |
2706 | return 0; |
2707 | } | |
2708 | } | |
2709 | else | |
2710 | { | |
2711 | /* We caught the SIGSTOP that we intended to catch, so | |
2712 | there's no SIGSTOP pending. */ | |
2713 | lp->stopped = 1; | |
2714 | lp->signalled = 0; | |
2715 | } | |
2716 | } | |
2717 | ||
2718 | return 0; | |
2719 | } | |
2720 | ||
d6b0e80f AC |
2721 | /* Return non-zero if LP has a wait status pending. */ |
2722 | ||
2723 | static int | |
2724 | status_callback (struct lwp_info *lp, void *data) | |
2725 | { | |
2726 | /* Only report a pending wait status if we pretend that this has | |
2727 | indeed been resumed. */ | |
ca2163eb PA |
2728 | if (!lp->resumed) |
2729 | return 0; | |
2730 | ||
2731 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2732 | { | |
2733 | /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event, | |
2734 | or a a pending process exit. Note that `W_EXITCODE(0,0) == | |
2735 | 0', so a clean process exit can not be stored pending in | |
2736 | lp->status, it is indistinguishable from | |
2737 | no-pending-status. */ | |
2738 | return 1; | |
2739 | } | |
2740 | ||
2741 | if (lp->status != 0) | |
2742 | return 1; | |
2743 | ||
2744 | return 0; | |
d6b0e80f AC |
2745 | } |
2746 | ||
2747 | /* Return non-zero if LP isn't stopped. */ | |
2748 | ||
2749 | static int | |
2750 | running_callback (struct lwp_info *lp, void *data) | |
2751 | { | |
2752 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2753 | } | |
2754 | ||
2755 | /* Count the LWP's that have had events. */ | |
2756 | ||
2757 | static int | |
2758 | count_events_callback (struct lwp_info *lp, void *data) | |
2759 | { | |
2760 | int *count = data; | |
2761 | ||
2762 | gdb_assert (count != NULL); | |
2763 | ||
e09490f1 DJ |
2764 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
2765 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2766 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2767 | (*count)++; | |
2768 | ||
2769 | return 0; | |
2770 | } | |
2771 | ||
2772 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2773 | ||
2774 | static int | |
2775 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2776 | { | |
2777 | if (lp->step && lp->status != 0) | |
2778 | return 1; | |
2779 | else | |
2780 | return 0; | |
2781 | } | |
2782 | ||
2783 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2784 | ||
2785 | static int | |
2786 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2787 | { | |
2788 | int *selector = data; | |
2789 | ||
2790 | gdb_assert (selector != NULL); | |
2791 | ||
e09490f1 DJ |
2792 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
2793 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2794 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2795 | if ((*selector)-- == 0) | |
2796 | return 1; | |
2797 | ||
2798 | return 0; | |
2799 | } | |
2800 | ||
710151dd PA |
2801 | static int |
2802 | cancel_breakpoint (struct lwp_info *lp) | |
2803 | { | |
2804 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2805 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2806 | LWP. We will handle the current event, eventually we will resume | |
2807 | this LWP, and this breakpoint will trap again. | |
2808 | ||
2809 | If we do not do this, then we run the risk that the user will | |
2810 | delete or disable the breakpoint, but the LWP will have already | |
2811 | tripped on it. */ | |
2812 | ||
515630c5 UW |
2813 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2814 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2815 | CORE_ADDR pc; | |
2816 | ||
2817 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
6c95b8df | 2818 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
710151dd PA |
2819 | { |
2820 | if (debug_linux_nat) | |
2821 | fprintf_unfiltered (gdb_stdlog, | |
2822 | "CB: Push back breakpoint for %s\n", | |
2823 | target_pid_to_str (lp->ptid)); | |
2824 | ||
2825 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2826 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2827 | regcache_write_pc (regcache, pc); | |
2828 | ||
710151dd PA |
2829 | return 1; |
2830 | } | |
2831 | return 0; | |
2832 | } | |
2833 | ||
d6b0e80f AC |
2834 | static int |
2835 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2836 | { | |
2837 | struct lwp_info *event_lp = data; | |
2838 | ||
2839 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2840 | if (lp == event_lp) | |
2841 | return 0; | |
2842 | ||
2843 | /* If a LWP other than the LWP that we're reporting an event for has | |
2844 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2845 | then just arrange for it to hit it again later. We don't keep | |
2846 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2847 | LWP. We will handle the current event, eventually we will resume | |
2848 | all LWPs, and this one will get its breakpoint trap again. | |
2849 | ||
2850 | If we do not do this, then we run the risk that the user will | |
2851 | delete or disable the breakpoint, but the LWP will have already | |
2852 | tripped on it. */ | |
2853 | ||
ca2163eb PA |
2854 | if (lp->waitstatus.kind == TARGET_WAITKIND_IGNORE |
2855 | && lp->status != 0 | |
d6b0e80f | 2856 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP |
710151dd PA |
2857 | && cancel_breakpoint (lp)) |
2858 | /* Throw away the SIGTRAP. */ | |
2859 | lp->status = 0; | |
d6b0e80f AC |
2860 | |
2861 | return 0; | |
2862 | } | |
2863 | ||
2864 | /* Select one LWP out of those that have events pending. */ | |
2865 | ||
2866 | static void | |
d90e17a7 | 2867 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
2868 | { |
2869 | int num_events = 0; | |
2870 | int random_selector; | |
2871 | struct lwp_info *event_lp; | |
2872 | ||
ac264b3b | 2873 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2874 | (*orig_lp)->status = *status; |
2875 | ||
2876 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
2877 | event_lp = iterate_over_lwps (filter, |
2878 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
2879 | if (event_lp != NULL) |
2880 | { | |
2881 | if (debug_linux_nat) | |
2882 | fprintf_unfiltered (gdb_stdlog, | |
2883 | "SEL: Select single-step %s\n", | |
2884 | target_pid_to_str (event_lp->ptid)); | |
2885 | } | |
2886 | else | |
2887 | { | |
2888 | /* No single-stepping LWP. Select one at random, out of those | |
2889 | which have had SIGTRAP events. */ | |
2890 | ||
2891 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 2892 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
2893 | |
2894 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2895 | random_selector = (int) | |
2896 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2897 | ||
2898 | if (debug_linux_nat && num_events > 1) | |
2899 | fprintf_unfiltered (gdb_stdlog, | |
2900 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2901 | num_events, random_selector); | |
2902 | ||
d90e17a7 PA |
2903 | event_lp = iterate_over_lwps (filter, |
2904 | select_event_lwp_callback, | |
d6b0e80f AC |
2905 | &random_selector); |
2906 | } | |
2907 | ||
2908 | if (event_lp != NULL) | |
2909 | { | |
2910 | /* Switch the event LWP. */ | |
2911 | *orig_lp = event_lp; | |
2912 | *status = event_lp->status; | |
2913 | } | |
2914 | ||
2915 | /* Flush the wait status for the event LWP. */ | |
2916 | (*orig_lp)->status = 0; | |
2917 | } | |
2918 | ||
2919 | /* Return non-zero if LP has been resumed. */ | |
2920 | ||
2921 | static int | |
2922 | resumed_callback (struct lwp_info *lp, void *data) | |
2923 | { | |
2924 | return lp->resumed; | |
2925 | } | |
2926 | ||
d6b0e80f AC |
2927 | /* Stop an active thread, verify it still exists, then resume it. */ |
2928 | ||
2929 | static int | |
2930 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
2931 | { | |
2932 | struct lwp_info *ptr; | |
2933 | ||
2934 | if (!lp->stopped && !lp->signalled) | |
2935 | { | |
2936 | stop_callback (lp, NULL); | |
2937 | stop_wait_callback (lp, NULL); | |
2938 | /* Resume if the lwp still exists. */ | |
2939 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
2940 | if (lp == ptr) | |
2941 | { | |
2942 | resume_callback (lp, NULL); | |
2943 | resume_set_callback (lp, NULL); | |
2944 | } | |
2945 | } | |
2946 | return 0; | |
2947 | } | |
2948 | ||
02f3fc28 | 2949 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 2950 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
2951 | static struct lwp_info * |
2952 | linux_nat_filter_event (int lwpid, int status, int options) | |
2953 | { | |
2954 | struct lwp_info *lp; | |
2955 | ||
2956 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2957 | ||
2958 | /* Check for stop events reported by a process we didn't already | |
2959 | know about - anything not already in our LWP list. | |
2960 | ||
2961 | If we're expecting to receive stopped processes after | |
2962 | fork, vfork, and clone events, then we'll just add the | |
2963 | new one to our list and go back to waiting for the event | |
2964 | to be reported - the stopped process might be returned | |
2965 | from waitpid before or after the event is. */ | |
2966 | if (WIFSTOPPED (status) && !lp) | |
2967 | { | |
2968 | linux_record_stopped_pid (lwpid, status); | |
2969 | return NULL; | |
2970 | } | |
2971 | ||
2972 | /* Make sure we don't report an event for the exit of an LWP not in | |
2973 | our list, i.e. not part of the current process. This can happen | |
2974 | if we detach from a program we original forked and then it | |
2975 | exits. */ | |
2976 | if (!WIFSTOPPED (status) && !lp) | |
2977 | return NULL; | |
2978 | ||
2979 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
2980 | CLONE_PTRACE processes which do not use the thread library - | |
2981 | otherwise we wouldn't find the new LWP this way. That doesn't | |
2982 | currently work, and the following code is currently unreachable | |
2983 | due to the two blocks above. If it's fixed some day, this code | |
2984 | should be broken out into a function so that we can also pick up | |
2985 | LWPs from the new interface. */ | |
2986 | if (!lp) | |
2987 | { | |
2988 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
2989 | if (options & __WCLONE) | |
2990 | lp->cloned = 1; | |
2991 | ||
2992 | gdb_assert (WIFSTOPPED (status) | |
2993 | && WSTOPSIG (status) == SIGSTOP); | |
2994 | lp->signalled = 1; | |
2995 | ||
2996 | if (!in_thread_list (inferior_ptid)) | |
2997 | { | |
2998 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
2999 | GET_PID (inferior_ptid)); | |
3000 | add_thread (inferior_ptid); | |
3001 | } | |
3002 | ||
3003 | add_thread (lp->ptid); | |
3004 | } | |
3005 | ||
ca2163eb PA |
3006 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3007 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3008 | { | |
3009 | /* No longer need the sysgood bit. The ptrace event ends up | |
3010 | recorded in lp->waitstatus if we care for it. We can carry | |
3011 | on handling the event like a regular SIGTRAP from here | |
3012 | on. */ | |
3013 | status = W_STOPCODE (SIGTRAP); | |
3014 | if (linux_handle_syscall_trap (lp, 0)) | |
3015 | return NULL; | |
3016 | } | |
02f3fc28 | 3017 | |
ca2163eb PA |
3018 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
3019 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
02f3fc28 PA |
3020 | { |
3021 | if (debug_linux_nat) | |
3022 | fprintf_unfiltered (gdb_stdlog, | |
3023 | "LLW: Handling extended status 0x%06x\n", | |
3024 | status); | |
3025 | if (linux_handle_extended_wait (lp, status, 0)) | |
3026 | return NULL; | |
3027 | } | |
3028 | ||
ca2163eb PA |
3029 | /* Save the trap's siginfo in case we need it later. */ |
3030 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) | |
3031 | save_siginfo (lp); | |
3032 | ||
02f3fc28 | 3033 | /* Check if the thread has exited. */ |
d90e17a7 PA |
3034 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
3035 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 3036 | { |
9db03742 JB |
3037 | /* If this is the main thread, we must stop all threads and verify |
3038 | if they are still alive. This is because in the nptl thread model | |
3039 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
3040 | other than the main thread. We only get the main thread exit |
3041 | signal once all child threads have already exited. If we | |
3042 | stop all the threads and use the stop_wait_callback to check | |
3043 | if they have exited we can determine whether this signal | |
3044 | should be ignored or whether it means the end of the debugged | |
3045 | application, regardless of which threading model is being | |
5d3b6af6 | 3046 | used. */ |
02f3fc28 PA |
3047 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
3048 | { | |
3049 | lp->stopped = 1; | |
d90e17a7 PA |
3050 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
3051 | stop_and_resume_callback, NULL); | |
02f3fc28 PA |
3052 | } |
3053 | ||
3054 | if (debug_linux_nat) | |
3055 | fprintf_unfiltered (gdb_stdlog, | |
3056 | "LLW: %s exited.\n", | |
3057 | target_pid_to_str (lp->ptid)); | |
3058 | ||
d90e17a7 | 3059 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
3060 | { |
3061 | /* If there is at least one more LWP, then the exit signal | |
3062 | was not the end of the debugged application and should be | |
3063 | ignored. */ | |
3064 | exit_lwp (lp); | |
3065 | return NULL; | |
3066 | } | |
02f3fc28 PA |
3067 | } |
3068 | ||
3069 | /* Check if the current LWP has previously exited. In the nptl | |
3070 | thread model, LWPs other than the main thread do not issue | |
3071 | signals when they exit so we must check whenever the thread has | |
3072 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 3073 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 3074 | { |
d90e17a7 PA |
3075 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
3076 | ||
02f3fc28 PA |
3077 | if (debug_linux_nat) |
3078 | fprintf_unfiltered (gdb_stdlog, | |
3079 | "LLW: %s exited.\n", | |
3080 | target_pid_to_str (lp->ptid)); | |
3081 | ||
3082 | exit_lwp (lp); | |
3083 | ||
3084 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 3085 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
3086 | |
3087 | /* Discard the event. */ | |
3088 | return NULL; | |
3089 | } | |
3090 | ||
3091 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
3092 | an attempt to stop an LWP. */ | |
3093 | if (lp->signalled | |
3094 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3095 | { | |
3096 | if (debug_linux_nat) | |
3097 | fprintf_unfiltered (gdb_stdlog, | |
3098 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
3099 | target_pid_to_str (lp->ptid)); | |
3100 | ||
3101 | /* This is a delayed SIGSTOP. */ | |
3102 | lp->signalled = 0; | |
3103 | ||
3104 | registers_changed (); | |
3105 | ||
28439f5e | 3106 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
02f3fc28 PA |
3107 | lp->step, TARGET_SIGNAL_0); |
3108 | if (debug_linux_nat) | |
3109 | fprintf_unfiltered (gdb_stdlog, | |
3110 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
3111 | lp->step ? | |
3112 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3113 | target_pid_to_str (lp->ptid)); | |
3114 | ||
3115 | lp->stopped = 0; | |
3116 | gdb_assert (lp->resumed); | |
3117 | ||
3118 | /* Discard the event. */ | |
3119 | return NULL; | |
3120 | } | |
3121 | ||
57380f4e DJ |
3122 | /* Make sure we don't report a SIGINT that we have already displayed |
3123 | for another thread. */ | |
3124 | if (lp->ignore_sigint | |
3125 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3126 | { | |
3127 | if (debug_linux_nat) | |
3128 | fprintf_unfiltered (gdb_stdlog, | |
3129 | "LLW: Delayed SIGINT caught for %s.\n", | |
3130 | target_pid_to_str (lp->ptid)); | |
3131 | ||
3132 | /* This is a delayed SIGINT. */ | |
3133 | lp->ignore_sigint = 0; | |
3134 | ||
3135 | registers_changed (); | |
28439f5e | 3136 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
3137 | lp->step, TARGET_SIGNAL_0); |
3138 | if (debug_linux_nat) | |
3139 | fprintf_unfiltered (gdb_stdlog, | |
3140 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3141 | lp->step ? | |
3142 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3143 | target_pid_to_str (lp->ptid)); | |
3144 | ||
3145 | lp->stopped = 0; | |
3146 | gdb_assert (lp->resumed); | |
3147 | ||
3148 | /* Discard the event. */ | |
3149 | return NULL; | |
3150 | } | |
3151 | ||
02f3fc28 PA |
3152 | /* An interesting event. */ |
3153 | gdb_assert (lp); | |
ca2163eb | 3154 | lp->status = status; |
02f3fc28 PA |
3155 | return lp; |
3156 | } | |
3157 | ||
d6b0e80f | 3158 | static ptid_t |
7feb7d06 | 3159 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3160 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3161 | int target_options) | |
d6b0e80f | 3162 | { |
7feb7d06 | 3163 | static sigset_t prev_mask; |
d6b0e80f AC |
3164 | struct lwp_info *lp = NULL; |
3165 | int options = 0; | |
3166 | int status = 0; | |
d90e17a7 | 3167 | pid_t pid; |
d6b0e80f | 3168 | |
b84876c2 PA |
3169 | if (debug_linux_nat_async) |
3170 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); | |
3171 | ||
f973ed9c DJ |
3172 | /* The first time we get here after starting a new inferior, we may |
3173 | not have added it to the LWP list yet - this is the earliest | |
3174 | moment at which we know its PID. */ | |
d90e17a7 | 3175 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3176 | { |
27c9d204 PA |
3177 | /* Upgrade the main thread's ptid. */ |
3178 | thread_change_ptid (inferior_ptid, | |
3179 | BUILD_LWP (GET_PID (inferior_ptid), | |
3180 | GET_PID (inferior_ptid))); | |
3181 | ||
f973ed9c DJ |
3182 | lp = add_lwp (inferior_ptid); |
3183 | lp->resumed = 1; | |
3184 | } | |
3185 | ||
7feb7d06 PA |
3186 | /* Make sure SIGCHLD is blocked. */ |
3187 | block_child_signals (&prev_mask); | |
d6b0e80f | 3188 | |
d90e17a7 PA |
3189 | if (ptid_equal (ptid, minus_one_ptid)) |
3190 | pid = -1; | |
3191 | else if (ptid_is_pid (ptid)) | |
3192 | /* A request to wait for a specific tgid. This is not possible | |
3193 | with waitpid, so instead, we wait for any child, and leave | |
3194 | children we're not interested in right now with a pending | |
3195 | status to report later. */ | |
3196 | pid = -1; | |
3197 | else | |
3198 | pid = GET_LWP (ptid); | |
3199 | ||
d6b0e80f | 3200 | retry: |
d90e17a7 PA |
3201 | lp = NULL; |
3202 | status = 0; | |
d6b0e80f | 3203 | |
f973ed9c | 3204 | /* Make sure there is at least one LWP that has been resumed. */ |
d90e17a7 | 3205 | gdb_assert (iterate_over_lwps (ptid, resumed_callback, NULL)); |
d6b0e80f AC |
3206 | |
3207 | /* First check if there is a LWP with a wait status pending. */ | |
3208 | if (pid == -1) | |
3209 | { | |
3210 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 3211 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
3212 | if (lp) |
3213 | { | |
ca2163eb | 3214 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3215 | fprintf_unfiltered (gdb_stdlog, |
3216 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3217 | status_to_str (lp->status), |
d6b0e80f AC |
3218 | target_pid_to_str (lp->ptid)); |
3219 | } | |
3220 | ||
b84876c2 | 3221 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
3222 | cloned and uncloned processes. We start with the cloned |
3223 | processes. */ | |
d6b0e80f AC |
3224 | options = __WCLONE | WNOHANG; |
3225 | } | |
3226 | else if (is_lwp (ptid)) | |
3227 | { | |
3228 | if (debug_linux_nat) | |
3229 | fprintf_unfiltered (gdb_stdlog, | |
3230 | "LLW: Waiting for specific LWP %s.\n", | |
3231 | target_pid_to_str (ptid)); | |
3232 | ||
3233 | /* We have a specific LWP to check. */ | |
3234 | lp = find_lwp_pid (ptid); | |
3235 | gdb_assert (lp); | |
d6b0e80f | 3236 | |
ca2163eb | 3237 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3238 | fprintf_unfiltered (gdb_stdlog, |
3239 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3240 | status_to_str (lp->status), |
d6b0e80f AC |
3241 | target_pid_to_str (lp->ptid)); |
3242 | ||
3243 | /* If we have to wait, take into account whether PID is a cloned | |
3244 | process or not. And we have to convert it to something that | |
3245 | the layer beneath us can understand. */ | |
3246 | options = lp->cloned ? __WCLONE : 0; | |
3247 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
3248 | |
3249 | /* We check for lp->waitstatus in addition to lp->status, | |
3250 | because we can have pending process exits recorded in | |
3251 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
3252 | an additional lp->status_p flag. */ | |
ca2163eb | 3253 | if (lp->status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) |
d90e17a7 | 3254 | lp = NULL; |
d6b0e80f AC |
3255 | } |
3256 | ||
d90e17a7 | 3257 | if (lp && lp->signalled) |
d6b0e80f AC |
3258 | { |
3259 | /* A pending SIGSTOP may interfere with the normal stream of | |
3260 | events. In a typical case where interference is a problem, | |
3261 | we have a SIGSTOP signal pending for LWP A while | |
3262 | single-stepping it, encounter an event in LWP B, and take the | |
3263 | pending SIGSTOP while trying to stop LWP A. After processing | |
3264 | the event in LWP B, LWP A is continued, and we'll never see | |
3265 | the SIGTRAP associated with the last time we were | |
3266 | single-stepping LWP A. */ | |
3267 | ||
3268 | /* Resume the thread. It should halt immediately returning the | |
3269 | pending SIGSTOP. */ | |
3270 | registers_changed (); | |
28439f5e | 3271 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3272 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
3273 | if (debug_linux_nat) |
3274 | fprintf_unfiltered (gdb_stdlog, | |
3275 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
3276 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3277 | target_pid_to_str (lp->ptid)); | |
3278 | lp->stopped = 0; | |
3279 | gdb_assert (lp->resumed); | |
3280 | ||
ca2163eb PA |
3281 | /* Catch the pending SIGSTOP. */ |
3282 | status = lp->status; | |
3283 | lp->status = 0; | |
3284 | ||
d6b0e80f | 3285 | stop_wait_callback (lp, NULL); |
ca2163eb PA |
3286 | |
3287 | /* If the lp->status field isn't empty, we caught another signal | |
3288 | while flushing the SIGSTOP. Return it back to the event | |
3289 | queue of the LWP, as we already have an event to handle. */ | |
3290 | if (lp->status) | |
3291 | { | |
3292 | if (debug_linux_nat) | |
3293 | fprintf_unfiltered (gdb_stdlog, | |
3294 | "LLW: kill %s, %s\n", | |
3295 | target_pid_to_str (lp->ptid), | |
3296 | status_to_str (lp->status)); | |
3297 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
3298 | } | |
3299 | ||
3300 | lp->status = status; | |
d6b0e80f AC |
3301 | } |
3302 | ||
b84876c2 PA |
3303 | if (!target_can_async_p ()) |
3304 | { | |
3305 | /* Causes SIGINT to be passed on to the attached process. */ | |
3306 | set_sigint_trap (); | |
b84876c2 | 3307 | } |
d6b0e80f | 3308 | |
47608cb1 PA |
3309 | /* Translate generic target_wait options into waitpid options. */ |
3310 | if (target_options & TARGET_WNOHANG) | |
3311 | options |= WNOHANG; | |
7feb7d06 | 3312 | |
d90e17a7 | 3313 | while (lp == NULL) |
d6b0e80f AC |
3314 | { |
3315 | pid_t lwpid; | |
3316 | ||
7feb7d06 | 3317 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 3318 | |
d6b0e80f AC |
3319 | if (lwpid > 0) |
3320 | { | |
3321 | gdb_assert (pid == -1 || lwpid == pid); | |
3322 | ||
3323 | if (debug_linux_nat) | |
3324 | { | |
3325 | fprintf_unfiltered (gdb_stdlog, | |
3326 | "LLW: waitpid %ld received %s\n", | |
3327 | (long) lwpid, status_to_str (status)); | |
3328 | } | |
3329 | ||
02f3fc28 | 3330 | lp = linux_nat_filter_event (lwpid, status, options); |
d90e17a7 PA |
3331 | |
3332 | if (lp | |
3333 | && ptid_is_pid (ptid) | |
3334 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 3335 | { |
d90e17a7 PA |
3336 | if (debug_linux_nat) |
3337 | fprintf (stderr, "LWP %ld got an event %06x, leaving pending.\n", | |
3338 | ptid_get_lwp (lp->ptid), status); | |
3339 | ||
ca2163eb | 3340 | if (WIFSTOPPED (lp->status)) |
d90e17a7 | 3341 | { |
ca2163eb | 3342 | if (WSTOPSIG (lp->status) != SIGSTOP) |
d90e17a7 | 3343 | { |
d90e17a7 PA |
3344 | stop_callback (lp, NULL); |
3345 | ||
3346 | /* Resume in order to collect the sigstop. */ | |
3347 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
3348 | ||
3349 | stop_wait_callback (lp, NULL); | |
3350 | } | |
3351 | else | |
3352 | { | |
3353 | lp->stopped = 1; | |
3354 | lp->signalled = 0; | |
3355 | } | |
3356 | } | |
3357 | else if (WIFEXITED (status) || WIFSIGNALED (status)) | |
3358 | { | |
3359 | if (debug_linux_nat) | |
3360 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
3361 | ptid_get_lwp (lp->ptid)); | |
3362 | ||
3363 | /* This was the last lwp in the process. Since | |
3364 | events are serialized to GDB core, and we can't | |
3365 | report this one right now, but GDB core and the | |
3366 | other target layers will want to be notified | |
3367 | about the exit code/signal, leave the status | |
3368 | pending for the next time we're able to report | |
3369 | it. */ | |
d90e17a7 PA |
3370 | |
3371 | /* Prevent trying to stop this thread again. We'll | |
3372 | never try to resume it because it has a pending | |
3373 | status. */ | |
3374 | lp->stopped = 1; | |
3375 | ||
3376 | /* Dead LWP's aren't expected to reported a pending | |
3377 | sigstop. */ | |
3378 | lp->signalled = 0; | |
3379 | ||
3380 | /* Store the pending event in the waitstatus as | |
3381 | well, because W_EXITCODE(0,0) == 0. */ | |
ca2163eb | 3382 | store_waitstatus (&lp->waitstatus, lp->status); |
d90e17a7 PA |
3383 | } |
3384 | ||
3385 | /* Keep looking. */ | |
3386 | lp = NULL; | |
d6b0e80f AC |
3387 | continue; |
3388 | } | |
3389 | ||
d90e17a7 PA |
3390 | if (lp) |
3391 | break; | |
3392 | else | |
3393 | { | |
3394 | if (pid == -1) | |
3395 | { | |
3396 | /* waitpid did return something. Restart over. */ | |
3397 | options |= __WCLONE; | |
3398 | } | |
3399 | continue; | |
3400 | } | |
d6b0e80f AC |
3401 | } |
3402 | ||
3403 | if (pid == -1) | |
3404 | { | |
3405 | /* Alternate between checking cloned and uncloned processes. */ | |
3406 | options ^= __WCLONE; | |
3407 | ||
b84876c2 PA |
3408 | /* And every time we have checked both: |
3409 | In async mode, return to event loop; | |
3410 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 3411 | if (options & __WCLONE) |
b84876c2 | 3412 | { |
47608cb1 | 3413 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
3414 | { |
3415 | /* No interesting event. */ | |
3416 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3417 | ||
b84876c2 PA |
3418 | if (debug_linux_nat_async) |
3419 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3420 | ||
7feb7d06 | 3421 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
3422 | return minus_one_ptid; |
3423 | } | |
3424 | ||
3425 | sigsuspend (&suspend_mask); | |
3426 | } | |
d6b0e80f | 3427 | } |
28736962 PA |
3428 | else if (target_options & TARGET_WNOHANG) |
3429 | { | |
3430 | /* No interesting event for PID yet. */ | |
3431 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3432 | ||
3433 | if (debug_linux_nat_async) | |
3434 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3435 | ||
3436 | restore_child_signals_mask (&prev_mask); | |
3437 | return minus_one_ptid; | |
3438 | } | |
d6b0e80f AC |
3439 | |
3440 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3441 | gdb_assert (lp == NULL); |
d6b0e80f AC |
3442 | } |
3443 | ||
b84876c2 | 3444 | if (!target_can_async_p ()) |
d26b5354 | 3445 | clear_sigint_trap (); |
d6b0e80f AC |
3446 | |
3447 | gdb_assert (lp); | |
3448 | ||
ca2163eb PA |
3449 | status = lp->status; |
3450 | lp->status = 0; | |
3451 | ||
d6b0e80f AC |
3452 | /* Don't report signals that GDB isn't interested in, such as |
3453 | signals that are neither printed nor stopped upon. Stopping all | |
3454 | threads can be a bit time-consuming so if we want decent | |
3455 | performance with heavily multi-threaded programs, especially when | |
3456 | they're using a high frequency timer, we'd better avoid it if we | |
3457 | can. */ | |
3458 | ||
3459 | if (WIFSTOPPED (status)) | |
3460 | { | |
3461 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
d6b48e9c PA |
3462 | struct inferior *inf; |
3463 | ||
3464 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
3465 | gdb_assert (inf); | |
d6b0e80f | 3466 | |
d6b48e9c PA |
3467 | /* Defer to common code if we get a signal while |
3468 | single-stepping, since that may need special care, e.g. to | |
3469 | skip the signal handler, or, if we're gaining control of the | |
3470 | inferior. */ | |
d539ed7e | 3471 | if (!lp->step |
d6b48e9c | 3472 | && inf->stop_soon == NO_STOP_QUIETLY |
d539ed7e | 3473 | && signal_stop_state (signo) == 0 |
d6b0e80f AC |
3474 | && signal_print_state (signo) == 0 |
3475 | && signal_pass_state (signo) == 1) | |
3476 | { | |
3477 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3478 | here? It is not clear we should. GDB may not expect | |
3479 | other threads to run. On the other hand, not resuming | |
3480 | newly attached threads may cause an unwanted delay in | |
3481 | getting them running. */ | |
3482 | registers_changed (); | |
28439f5e | 3483 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3484 | lp->step, signo); |
d6b0e80f AC |
3485 | if (debug_linux_nat) |
3486 | fprintf_unfiltered (gdb_stdlog, | |
3487 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3488 | lp->step ? | |
3489 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3490 | target_pid_to_str (lp->ptid), | |
3491 | signo ? strsignal (signo) : "0"); | |
3492 | lp->stopped = 0; | |
d6b0e80f AC |
3493 | goto retry; |
3494 | } | |
3495 | ||
1ad15515 | 3496 | if (!non_stop) |
d6b0e80f | 3497 | { |
1ad15515 PA |
3498 | /* Only do the below in all-stop, as we currently use SIGINT |
3499 | to implement target_stop (see linux_nat_stop) in | |
3500 | non-stop. */ | |
3501 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3502 | { | |
3503 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3504 | forwarded to the entire process group, that is, all LWPs | |
3505 | will receive it - unless they're using CLONE_THREAD to | |
3506 | share signals. Since we only want to report it once, we | |
3507 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3508 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3509 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3510 | lp->ignore_sigint = 0; |
3511 | } | |
3512 | else | |
3513 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3514 | } |
3515 | } | |
3516 | ||
3517 | /* This LWP is stopped now. */ | |
3518 | lp->stopped = 1; | |
3519 | ||
3520 | if (debug_linux_nat) | |
3521 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3522 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3523 | ||
4c28f408 PA |
3524 | if (!non_stop) |
3525 | { | |
3526 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3527 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3528 | |
3529 | /* ... and wait until all of them have reported back that | |
3530 | they're no longer running. */ | |
d90e17a7 | 3531 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3532 | |
3533 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3534 | from among those that have had events. Giving equal priority | |
3535 | to all LWPs that have had events helps prevent | |
3536 | starvation. */ | |
3537 | if (pid == -1) | |
d90e17a7 | 3538 | select_event_lwp (ptid, &lp, &status); |
4c28f408 | 3539 | } |
d6b0e80f AC |
3540 | |
3541 | /* Now that we've selected our final event LWP, cancel any | |
3542 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
3543 | the comment in cancel_breakpoints_callback to find out why. */ | |
d90e17a7 | 3544 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); |
d6b0e80f | 3545 | |
d6b0e80f AC |
3546 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) |
3547 | { | |
d6b0e80f AC |
3548 | if (debug_linux_nat) |
3549 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3550 | "LLW: trap ptid is %s.\n", |
3551 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3552 | } |
d6b0e80f AC |
3553 | |
3554 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3555 | { | |
3556 | *ourstatus = lp->waitstatus; | |
3557 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3558 | } | |
3559 | else | |
3560 | store_waitstatus (ourstatus, status); | |
3561 | ||
b84876c2 PA |
3562 | if (debug_linux_nat_async) |
3563 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); | |
3564 | ||
7feb7d06 | 3565 | restore_child_signals_mask (&prev_mask); |
f973ed9c | 3566 | return lp->ptid; |
d6b0e80f AC |
3567 | } |
3568 | ||
7feb7d06 PA |
3569 | static ptid_t |
3570 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3571 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3572 | int target_options) | |
7feb7d06 PA |
3573 | { |
3574 | ptid_t event_ptid; | |
3575 | ||
3576 | if (debug_linux_nat) | |
3577 | fprintf_unfiltered (gdb_stdlog, "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
3578 | ||
3579 | /* Flush the async file first. */ | |
3580 | if (target_can_async_p ()) | |
3581 | async_file_flush (); | |
3582 | ||
47608cb1 | 3583 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3584 | |
3585 | /* If we requested any event, and something came out, assume there | |
3586 | may be more. If we requested a specific lwp or process, also | |
3587 | assume there may be more. */ | |
3588 | if (target_can_async_p () | |
3589 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3590 | || !ptid_equal (ptid, minus_one_ptid))) | |
3591 | async_file_mark (); | |
3592 | ||
3593 | /* Get ready for the next event. */ | |
3594 | if (target_can_async_p ()) | |
3595 | target_async (inferior_event_handler, 0); | |
3596 | ||
3597 | return event_ptid; | |
3598 | } | |
3599 | ||
d6b0e80f AC |
3600 | static int |
3601 | kill_callback (struct lwp_info *lp, void *data) | |
3602 | { | |
3603 | errno = 0; | |
3604 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3605 | if (debug_linux_nat) | |
3606 | fprintf_unfiltered (gdb_stdlog, | |
3607 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3608 | target_pid_to_str (lp->ptid), | |
3609 | errno ? safe_strerror (errno) : "OK"); | |
3610 | ||
3611 | return 0; | |
3612 | } | |
3613 | ||
3614 | static int | |
3615 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3616 | { | |
3617 | pid_t pid; | |
3618 | ||
3619 | /* We must make sure that there are no pending events (delayed | |
3620 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3621 | program doesn't interfere with any following debugging session. */ | |
3622 | ||
3623 | /* For cloned processes we must check both with __WCLONE and | |
3624 | without, since the exit status of a cloned process isn't reported | |
3625 | with __WCLONE. */ | |
3626 | if (lp->cloned) | |
3627 | { | |
3628 | do | |
3629 | { | |
58aecb61 | 3630 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3631 | if (pid != (pid_t) -1) |
d6b0e80f | 3632 | { |
e85a822c DJ |
3633 | if (debug_linux_nat) |
3634 | fprintf_unfiltered (gdb_stdlog, | |
3635 | "KWC: wait %s received unknown.\n", | |
3636 | target_pid_to_str (lp->ptid)); | |
3637 | /* The Linux kernel sometimes fails to kill a thread | |
3638 | completely after PTRACE_KILL; that goes from the stop | |
3639 | point in do_fork out to the one in | |
3640 | get_signal_to_deliever and waits again. So kill it | |
3641 | again. */ | |
3642 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3643 | } |
3644 | } | |
3645 | while (pid == GET_LWP (lp->ptid)); | |
3646 | ||
3647 | gdb_assert (pid == -1 && errno == ECHILD); | |
3648 | } | |
3649 | ||
3650 | do | |
3651 | { | |
58aecb61 | 3652 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3653 | if (pid != (pid_t) -1) |
d6b0e80f | 3654 | { |
e85a822c DJ |
3655 | if (debug_linux_nat) |
3656 | fprintf_unfiltered (gdb_stdlog, | |
3657 | "KWC: wait %s received unk.\n", | |
3658 | target_pid_to_str (lp->ptid)); | |
3659 | /* See the call to kill_callback above. */ | |
3660 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3661 | } |
3662 | } | |
3663 | while (pid == GET_LWP (lp->ptid)); | |
3664 | ||
3665 | gdb_assert (pid == -1 && errno == ECHILD); | |
3666 | return 0; | |
3667 | } | |
3668 | ||
3669 | static void | |
7d85a9c0 | 3670 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3671 | { |
f973ed9c DJ |
3672 | struct target_waitstatus last; |
3673 | ptid_t last_ptid; | |
3674 | int status; | |
d6b0e80f | 3675 | |
f973ed9c DJ |
3676 | /* If we're stopped while forking and we haven't followed yet, |
3677 | kill the other task. We need to do this first because the | |
3678 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3679 | |
f973ed9c | 3680 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3681 | |
f973ed9c DJ |
3682 | if (last.kind == TARGET_WAITKIND_FORKED |
3683 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3684 | { | |
3a3e9ee3 | 3685 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3686 | wait (&status); |
3687 | } | |
3688 | ||
3689 | if (forks_exist_p ()) | |
7feb7d06 | 3690 | linux_fork_killall (); |
f973ed9c DJ |
3691 | else |
3692 | { | |
d90e17a7 | 3693 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
4c28f408 PA |
3694 | /* Stop all threads before killing them, since ptrace requires |
3695 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3696 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3697 | /* ... and wait until all of them have reported back that |
3698 | they're no longer running. */ | |
d90e17a7 | 3699 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3700 | |
f973ed9c | 3701 | /* Kill all LWP's ... */ |
d90e17a7 | 3702 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3703 | |
3704 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3705 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3706 | } |
3707 | ||
3708 | target_mourn_inferior (); | |
d6b0e80f AC |
3709 | } |
3710 | ||
3711 | static void | |
136d6dae | 3712 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3713 | { |
d90e17a7 | 3714 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 3715 | |
f973ed9c | 3716 | if (! forks_exist_p ()) |
d90e17a7 PA |
3717 | /* Normal case, no other forks available. */ |
3718 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3719 | else |
3720 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3721 | there are other viable forks to debug. Delete the exiting | |
3722 | one and context-switch to the first available. */ | |
3723 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3724 | } |
3725 | ||
5b009018 PA |
3726 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3727 | layout of the inferiors' architecture. */ | |
3728 | ||
3729 | static void | |
3730 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
3731 | { | |
3732 | int done = 0; | |
3733 | ||
3734 | if (linux_nat_siginfo_fixup != NULL) | |
3735 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3736 | ||
3737 | /* If there was no callback, or the callback didn't do anything, | |
3738 | then just do a straight memcpy. */ | |
3739 | if (!done) | |
3740 | { | |
3741 | if (direction == 1) | |
3742 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3743 | else | |
3744 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3745 | } | |
3746 | } | |
3747 | ||
4aa995e1 PA |
3748 | static LONGEST |
3749 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
3750 | const char *annex, gdb_byte *readbuf, | |
3751 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3752 | { | |
4aa995e1 PA |
3753 | int pid; |
3754 | struct siginfo siginfo; | |
5b009018 | 3755 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3756 | |
3757 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3758 | gdb_assert (readbuf || writebuf); | |
3759 | ||
3760 | pid = GET_LWP (inferior_ptid); | |
3761 | if (pid == 0) | |
3762 | pid = GET_PID (inferior_ptid); | |
3763 | ||
3764 | if (offset > sizeof (siginfo)) | |
3765 | return -1; | |
3766 | ||
3767 | errno = 0; | |
3768 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3769 | if (errno != 0) | |
3770 | return -1; | |
3771 | ||
5b009018 PA |
3772 | /* When GDB is built as a 64-bit application, ptrace writes into |
3773 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3774 | inferior with a 64-bit GDB should look the same as debugging it | |
3775 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3776 | the converted layout, so any read/write will have to be done | |
3777 | post-conversion. */ | |
3778 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3779 | ||
4aa995e1 PA |
3780 | if (offset + len > sizeof (siginfo)) |
3781 | len = sizeof (siginfo) - offset; | |
3782 | ||
3783 | if (readbuf != NULL) | |
5b009018 | 3784 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3785 | else |
3786 | { | |
5b009018 PA |
3787 | memcpy (inf_siginfo + offset, writebuf, len); |
3788 | ||
3789 | /* Convert back to ptrace layout before flushing it out. */ | |
3790 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3791 | ||
4aa995e1 PA |
3792 | errno = 0; |
3793 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3794 | if (errno != 0) | |
3795 | return -1; | |
3796 | } | |
3797 | ||
3798 | return len; | |
3799 | } | |
3800 | ||
10d6c8cd DJ |
3801 | static LONGEST |
3802 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
3803 | const char *annex, gdb_byte *readbuf, | |
3804 | const gdb_byte *writebuf, | |
3805 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 3806 | { |
4aa995e1 | 3807 | struct cleanup *old_chain; |
10d6c8cd | 3808 | LONGEST xfer; |
d6b0e80f | 3809 | |
4aa995e1 PA |
3810 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3811 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
3812 | offset, len); | |
3813 | ||
c35b1492 PA |
3814 | /* The target is connected but no live inferior is selected. Pass |
3815 | this request down to a lower stratum (e.g., the executable | |
3816 | file). */ | |
3817 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
3818 | return 0; | |
3819 | ||
4aa995e1 PA |
3820 | old_chain = save_inferior_ptid (); |
3821 | ||
d6b0e80f AC |
3822 | if (is_lwp (inferior_ptid)) |
3823 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
3824 | ||
10d6c8cd DJ |
3825 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
3826 | offset, len); | |
d6b0e80f AC |
3827 | |
3828 | do_cleanups (old_chain); | |
3829 | return xfer; | |
3830 | } | |
3831 | ||
3832 | static int | |
28439f5e | 3833 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 3834 | { |
4c28f408 PA |
3835 | int err; |
3836 | ||
d6b0e80f AC |
3837 | gdb_assert (is_lwp (ptid)); |
3838 | ||
4c28f408 PA |
3839 | /* Send signal 0 instead of anything ptrace, because ptracing a |
3840 | running thread errors out claiming that the thread doesn't | |
3841 | exist. */ | |
3842 | err = kill_lwp (GET_LWP (ptid), 0); | |
3843 | ||
d6b0e80f AC |
3844 | if (debug_linux_nat) |
3845 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 3846 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 3847 | target_pid_to_str (ptid), |
4c28f408 | 3848 | err ? safe_strerror (err) : "OK"); |
9c0dd46b | 3849 | |
4c28f408 | 3850 | if (err != 0) |
d6b0e80f AC |
3851 | return 0; |
3852 | ||
3853 | return 1; | |
3854 | } | |
3855 | ||
28439f5e PA |
3856 | static int |
3857 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
3858 | { | |
3859 | return linux_thread_alive (ptid); | |
3860 | } | |
3861 | ||
d6b0e80f | 3862 | static char * |
117de6a9 | 3863 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
3864 | { |
3865 | static char buf[64]; | |
3866 | ||
a0ef4274 | 3867 | if (is_lwp (ptid) |
d90e17a7 PA |
3868 | && (GET_PID (ptid) != GET_LWP (ptid) |
3869 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
3870 | { |
3871 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
3872 | return buf; | |
3873 | } | |
3874 | ||
3875 | return normal_pid_to_str (ptid); | |
3876 | } | |
3877 | ||
dba24537 AC |
3878 | /* Accepts an integer PID; Returns a string representing a file that |
3879 | can be opened to get the symbols for the child process. */ | |
3880 | ||
6d8fd2b7 UW |
3881 | static char * |
3882 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
3883 | { |
3884 | char *name1, *name2; | |
3885 | ||
3886 | name1 = xmalloc (MAXPATHLEN); | |
3887 | name2 = xmalloc (MAXPATHLEN); | |
3888 | make_cleanup (xfree, name1); | |
3889 | make_cleanup (xfree, name2); | |
3890 | memset (name2, 0, MAXPATHLEN); | |
3891 | ||
3892 | sprintf (name1, "/proc/%d/exe", pid); | |
3893 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
3894 | return name2; | |
3895 | else | |
3896 | return name1; | |
3897 | } | |
3898 | ||
3899 | /* Service function for corefiles and info proc. */ | |
3900 | ||
3901 | static int | |
3902 | read_mapping (FILE *mapfile, | |
3903 | long long *addr, | |
3904 | long long *endaddr, | |
3905 | char *permissions, | |
3906 | long long *offset, | |
3907 | char *device, long long *inode, char *filename) | |
3908 | { | |
3909 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
3910 | addr, endaddr, permissions, offset, device, inode); | |
3911 | ||
2e14c2ea MS |
3912 | filename[0] = '\0'; |
3913 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
3914 | { |
3915 | /* Eat everything up to EOL for the filename. This will prevent | |
3916 | weird filenames (such as one with embedded whitespace) from | |
3917 | confusing this code. It also makes this code more robust in | |
3918 | respect to annotations the kernel may add after the filename. | |
3919 | ||
3920 | Note the filename is used for informational purposes | |
3921 | only. */ | |
3922 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
3923 | } | |
2e14c2ea | 3924 | |
dba24537 AC |
3925 | return (ret != 0 && ret != EOF); |
3926 | } | |
3927 | ||
3928 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
3929 | regions in the inferior for a corefile. */ | |
3930 | ||
3931 | static int | |
3932 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
3933 | unsigned long, | |
3934 | int, int, int, void *), void *obfd) | |
3935 | { | |
89ecc4f5 | 3936 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
3937 | char mapsfilename[MAXPATHLEN]; |
3938 | FILE *mapsfile; | |
3939 | long long addr, endaddr, size, offset, inode; | |
3940 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
3941 | int read, write, exec; | |
3942 | int ret; | |
7c8a8b04 | 3943 | struct cleanup *cleanup; |
dba24537 AC |
3944 | |
3945 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 3946 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 3947 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 3948 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 3949 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
3950 | |
3951 | if (info_verbose) | |
3952 | fprintf_filtered (gdb_stdout, | |
3953 | "Reading memory regions from %s\n", mapsfilename); | |
3954 | ||
3955 | /* Now iterate until end-of-file. */ | |
3956 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
3957 | &offset, &device[0], &inode, &filename[0])) | |
3958 | { | |
3959 | size = endaddr - addr; | |
3960 | ||
3961 | /* Get the segment's permissions. */ | |
3962 | read = (strchr (permissions, 'r') != 0); | |
3963 | write = (strchr (permissions, 'w') != 0); | |
3964 | exec = (strchr (permissions, 'x') != 0); | |
3965 | ||
3966 | if (info_verbose) | |
3967 | { | |
3968 | fprintf_filtered (gdb_stdout, | |
5af949e3 UW |
3969 | "Save segment, %lld bytes at %s (%c%c%c)", |
3970 | size, paddress (target_gdbarch, addr), | |
dba24537 AC |
3971 | read ? 'r' : ' ', |
3972 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 3973 | if (filename[0]) |
dba24537 AC |
3974 | fprintf_filtered (gdb_stdout, " for %s", filename); |
3975 | fprintf_filtered (gdb_stdout, "\n"); | |
3976 | } | |
3977 | ||
3978 | /* Invoke the callback function to create the corefile | |
3979 | segment. */ | |
3980 | func (addr, size, read, write, exec, obfd); | |
3981 | } | |
7c8a8b04 | 3982 | do_cleanups (cleanup); |
dba24537 AC |
3983 | return 0; |
3984 | } | |
3985 | ||
2020b7ab PA |
3986 | static int |
3987 | find_signalled_thread (struct thread_info *info, void *data) | |
3988 | { | |
3989 | if (info->stop_signal != TARGET_SIGNAL_0 | |
3990 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) | |
3991 | return 1; | |
3992 | ||
3993 | return 0; | |
3994 | } | |
3995 | ||
3996 | static enum target_signal | |
3997 | find_stop_signal (void) | |
3998 | { | |
3999 | struct thread_info *info = | |
4000 | iterate_over_threads (find_signalled_thread, NULL); | |
4001 | ||
4002 | if (info) | |
4003 | return info->stop_signal; | |
4004 | else | |
4005 | return TARGET_SIGNAL_0; | |
4006 | } | |
4007 | ||
dba24537 AC |
4008 | /* Records the thread's register state for the corefile note |
4009 | section. */ | |
4010 | ||
4011 | static char * | |
4012 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
4013 | char *note_data, int *note_size, |
4014 | enum target_signal stop_signal) | |
dba24537 AC |
4015 | { |
4016 | gdb_gregset_t gregs; | |
4017 | gdb_fpregset_t fpregs; | |
dba24537 | 4018 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
4019 | struct gdbarch *gdbarch = target_gdbarch; |
4020 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 4021 | const struct regset *regset; |
55e969c1 | 4022 | int core_regset_p; |
594f7785 | 4023 | struct cleanup *old_chain; |
17ea7499 CES |
4024 | struct core_regset_section *sect_list; |
4025 | char *gdb_regset; | |
594f7785 UW |
4026 | |
4027 | old_chain = save_inferior_ptid (); | |
4028 | inferior_ptid = ptid; | |
4029 | target_fetch_registers (regcache, -1); | |
4030 | do_cleanups (old_chain); | |
4f844a66 DM |
4031 | |
4032 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
4033 | sect_list = gdbarch_core_regset_sections (gdbarch); |
4034 | ||
55e969c1 DM |
4035 | if (core_regset_p |
4036 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
4037 | sizeof (gregs))) != NULL | |
4038 | && regset->collect_regset != NULL) | |
594f7785 | 4039 | regset->collect_regset (regset, regcache, -1, |
55e969c1 | 4040 | &gregs, sizeof (gregs)); |
4f844a66 | 4041 | else |
594f7785 | 4042 | fill_gregset (regcache, &gregs, -1); |
4f844a66 | 4043 | |
55e969c1 DM |
4044 | note_data = (char *) elfcore_write_prstatus (obfd, |
4045 | note_data, | |
4046 | note_size, | |
4047 | lwp, | |
4048 | stop_signal, &gregs); | |
4049 | ||
17ea7499 CES |
4050 | /* The loop below uses the new struct core_regset_section, which stores |
4051 | the supported section names and sizes for the core file. Note that | |
4052 | note PRSTATUS needs to be treated specially. But the other notes are | |
4053 | structurally the same, so they can benefit from the new struct. */ | |
4054 | if (core_regset_p && sect_list != NULL) | |
4055 | while (sect_list->sect_name != NULL) | |
4056 | { | |
4057 | /* .reg was already handled above. */ | |
4058 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
4059 | { | |
4060 | sect_list++; | |
4061 | continue; | |
4062 | } | |
4063 | regset = gdbarch_regset_from_core_section (gdbarch, | |
4064 | sect_list->sect_name, | |
4065 | sect_list->size); | |
4066 | gdb_assert (regset && regset->collect_regset); | |
4067 | gdb_regset = xmalloc (sect_list->size); | |
4068 | regset->collect_regset (regset, regcache, -1, | |
4069 | gdb_regset, sect_list->size); | |
4070 | note_data = (char *) elfcore_write_register_note (obfd, | |
4071 | note_data, | |
4072 | note_size, | |
4073 | sect_list->sect_name, | |
4074 | gdb_regset, | |
4075 | sect_list->size); | |
4076 | xfree (gdb_regset); | |
4077 | sect_list++; | |
4078 | } | |
dba24537 | 4079 | |
17ea7499 CES |
4080 | /* For architectures that does not have the struct core_regset_section |
4081 | implemented, we use the old method. When all the architectures have | |
4082 | the new support, the code below should be deleted. */ | |
4f844a66 | 4083 | else |
17ea7499 CES |
4084 | { |
4085 | if (core_regset_p | |
4086 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
4087 | sizeof (fpregs))) != NULL | |
4088 | && regset->collect_regset != NULL) | |
4089 | regset->collect_regset (regset, regcache, -1, | |
4090 | &fpregs, sizeof (fpregs)); | |
4091 | else | |
4092 | fill_fpregset (regcache, &fpregs, -1); | |
4093 | ||
4094 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
4095 | note_data, | |
4096 | note_size, | |
4097 | &fpregs, sizeof (fpregs)); | |
4098 | } | |
4f844a66 | 4099 | |
dba24537 AC |
4100 | return note_data; |
4101 | } | |
4102 | ||
4103 | struct linux_nat_corefile_thread_data | |
4104 | { | |
4105 | bfd *obfd; | |
4106 | char *note_data; | |
4107 | int *note_size; | |
4108 | int num_notes; | |
2020b7ab | 4109 | enum target_signal stop_signal; |
dba24537 AC |
4110 | }; |
4111 | ||
4112 | /* Called by gdbthread.c once per thread. Records the thread's | |
4113 | register state for the corefile note section. */ | |
4114 | ||
4115 | static int | |
4116 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
4117 | { | |
4118 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 4119 | |
dba24537 AC |
4120 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
4121 | ti->ptid, | |
4122 | args->note_data, | |
2020b7ab PA |
4123 | args->note_size, |
4124 | args->stop_signal); | |
dba24537 | 4125 | args->num_notes++; |
56be3814 | 4126 | |
dba24537 AC |
4127 | return 0; |
4128 | } | |
4129 | ||
efcbbd14 UW |
4130 | /* Enumerate spufs IDs for process PID. */ |
4131 | ||
4132 | static void | |
4133 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
4134 | { | |
4135 | char path[128]; | |
4136 | DIR *dir; | |
4137 | struct dirent *entry; | |
4138 | ||
4139 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4140 | dir = opendir (path); | |
4141 | if (!dir) | |
4142 | return; | |
4143 | ||
4144 | rewinddir (dir); | |
4145 | while ((entry = readdir (dir)) != NULL) | |
4146 | { | |
4147 | struct stat st; | |
4148 | struct statfs stfs; | |
4149 | int fd; | |
4150 | ||
4151 | fd = atoi (entry->d_name); | |
4152 | if (!fd) | |
4153 | continue; | |
4154 | ||
4155 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4156 | if (stat (path, &st) != 0) | |
4157 | continue; | |
4158 | if (!S_ISDIR (st.st_mode)) | |
4159 | continue; | |
4160 | ||
4161 | if (statfs (path, &stfs) != 0) | |
4162 | continue; | |
4163 | if (stfs.f_type != SPUFS_MAGIC) | |
4164 | continue; | |
4165 | ||
4166 | callback (data, fd); | |
4167 | } | |
4168 | ||
4169 | closedir (dir); | |
4170 | } | |
4171 | ||
4172 | /* Generate corefile notes for SPU contexts. */ | |
4173 | ||
4174 | struct linux_spu_corefile_data | |
4175 | { | |
4176 | bfd *obfd; | |
4177 | char *note_data; | |
4178 | int *note_size; | |
4179 | }; | |
4180 | ||
4181 | static void | |
4182 | linux_spu_corefile_callback (void *data, int fd) | |
4183 | { | |
4184 | struct linux_spu_corefile_data *args = data; | |
4185 | int i; | |
4186 | ||
4187 | static const char *spu_files[] = | |
4188 | { | |
4189 | "object-id", | |
4190 | "mem", | |
4191 | "regs", | |
4192 | "fpcr", | |
4193 | "lslr", | |
4194 | "decr", | |
4195 | "decr_status", | |
4196 | "signal1", | |
4197 | "signal1_type", | |
4198 | "signal2", | |
4199 | "signal2_type", | |
4200 | "event_mask", | |
4201 | "event_status", | |
4202 | "mbox_info", | |
4203 | "ibox_info", | |
4204 | "wbox_info", | |
4205 | "dma_info", | |
4206 | "proxydma_info", | |
4207 | }; | |
4208 | ||
4209 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
4210 | { | |
4211 | char annex[32], note_name[32]; | |
4212 | gdb_byte *spu_data; | |
4213 | LONGEST spu_len; | |
4214 | ||
4215 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
4216 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
4217 | annex, &spu_data); | |
4218 | if (spu_len > 0) | |
4219 | { | |
4220 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
4221 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
4222 | args->note_size, note_name, | |
4223 | NT_SPU, spu_data, spu_len); | |
4224 | xfree (spu_data); | |
4225 | } | |
4226 | } | |
4227 | } | |
4228 | ||
4229 | static char * | |
4230 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
4231 | { | |
4232 | struct linux_spu_corefile_data args; | |
4233 | args.obfd = obfd; | |
4234 | args.note_data = note_data; | |
4235 | args.note_size = note_size; | |
4236 | ||
4237 | iterate_over_spus (PIDGET (inferior_ptid), | |
4238 | linux_spu_corefile_callback, &args); | |
4239 | ||
4240 | return args.note_data; | |
4241 | } | |
4242 | ||
dba24537 AC |
4243 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
4244 | section for a corefile, and returns it in a malloc buffer. */ | |
4245 | ||
4246 | static char * | |
4247 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
4248 | { | |
4249 | struct linux_nat_corefile_thread_data thread_args; | |
4250 | struct cleanup *old_chain; | |
d99148ef | 4251 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 4252 | char fname[16] = { '\0' }; |
d99148ef | 4253 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
4254 | char psargs[80] = { '\0' }; |
4255 | char *note_data = NULL; | |
4256 | ptid_t current_ptid = inferior_ptid; | |
d90e17a7 | 4257 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 4258 | gdb_byte *auxv; |
dba24537 AC |
4259 | int auxv_len; |
4260 | ||
4261 | if (get_exec_file (0)) | |
4262 | { | |
4263 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
4264 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
4265 | if (get_inferior_args ()) | |
4266 | { | |
d99148ef JK |
4267 | char *string_end; |
4268 | char *psargs_end = psargs + sizeof (psargs); | |
4269 | ||
4270 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
4271 | strings fine. */ | |
4272 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
4273 | if (string_end != NULL) | |
4274 | { | |
4275 | *string_end++ = ' '; | |
4276 | strncpy (string_end, get_inferior_args (), | |
4277 | psargs_end - string_end); | |
4278 | } | |
dba24537 AC |
4279 | } |
4280 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
4281 | note_data, | |
4282 | note_size, fname, psargs); | |
4283 | } | |
4284 | ||
4285 | /* Dump information for threads. */ | |
4286 | thread_args.obfd = obfd; | |
4287 | thread_args.note_data = note_data; | |
4288 | thread_args.note_size = note_size; | |
4289 | thread_args.num_notes = 0; | |
2020b7ab | 4290 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 4291 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
4292 | gdb_assert (thread_args.num_notes != 0); |
4293 | note_data = thread_args.note_data; | |
dba24537 | 4294 | |
13547ab6 DJ |
4295 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
4296 | NULL, &auxv); | |
dba24537 AC |
4297 | if (auxv_len > 0) |
4298 | { | |
4299 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
4300 | "CORE", NT_AUXV, auxv, auxv_len); | |
4301 | xfree (auxv); | |
4302 | } | |
4303 | ||
efcbbd14 UW |
4304 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
4305 | ||
dba24537 AC |
4306 | make_cleanup (xfree, note_data); |
4307 | return note_data; | |
4308 | } | |
4309 | ||
4310 | /* Implement the "info proc" command. */ | |
4311 | ||
4312 | static void | |
4313 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
4314 | { | |
89ecc4f5 DE |
4315 | /* A long is used for pid instead of an int to avoid a loss of precision |
4316 | compiler warning from the output of strtoul. */ | |
4317 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
4318 | FILE *procfile; |
4319 | char **argv = NULL; | |
4320 | char buffer[MAXPATHLEN]; | |
4321 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
4322 | int cmdline_f = 1; | |
4323 | int cwd_f = 1; | |
4324 | int exe_f = 1; | |
4325 | int mappings_f = 0; | |
4326 | int environ_f = 0; | |
4327 | int status_f = 0; | |
4328 | int stat_f = 0; | |
4329 | int all = 0; | |
4330 | struct stat dummy; | |
4331 | ||
4332 | if (args) | |
4333 | { | |
4334 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
4335 | argv = gdb_buildargv (args); |
4336 | make_cleanup_freeargv (argv); | |
dba24537 AC |
4337 | } |
4338 | while (argv != NULL && *argv != NULL) | |
4339 | { | |
4340 | if (isdigit (argv[0][0])) | |
4341 | { | |
4342 | pid = strtoul (argv[0], NULL, 10); | |
4343 | } | |
4344 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
4345 | { | |
4346 | mappings_f = 1; | |
4347 | } | |
4348 | else if (strcmp (argv[0], "status") == 0) | |
4349 | { | |
4350 | status_f = 1; | |
4351 | } | |
4352 | else if (strcmp (argv[0], "stat") == 0) | |
4353 | { | |
4354 | stat_f = 1; | |
4355 | } | |
4356 | else if (strcmp (argv[0], "cmd") == 0) | |
4357 | { | |
4358 | cmdline_f = 1; | |
4359 | } | |
4360 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
4361 | { | |
4362 | exe_f = 1; | |
4363 | } | |
4364 | else if (strcmp (argv[0], "cwd") == 0) | |
4365 | { | |
4366 | cwd_f = 1; | |
4367 | } | |
4368 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
4369 | { | |
4370 | all = 1; | |
4371 | } | |
4372 | else | |
4373 | { | |
4374 | /* [...] (future options here) */ | |
4375 | } | |
4376 | argv++; | |
4377 | } | |
4378 | if (pid == 0) | |
8a3fe4f8 | 4379 | error (_("No current process: you must name one.")); |
dba24537 | 4380 | |
89ecc4f5 | 4381 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4382 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4383 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4384 | |
89ecc4f5 | 4385 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
4386 | if (cmdline_f || all) |
4387 | { | |
89ecc4f5 | 4388 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4389 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4390 | { |
7c8a8b04 | 4391 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
bf1d7d9c JB |
4392 | if (fgets (buffer, sizeof (buffer), procfile)) |
4393 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4394 | else | |
4395 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4396 | do_cleanups (cleanup); |
dba24537 AC |
4397 | } |
4398 | else | |
8a3fe4f8 | 4399 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4400 | } |
4401 | if (cwd_f || all) | |
4402 | { | |
89ecc4f5 | 4403 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4404 | memset (fname2, 0, sizeof (fname2)); |
4405 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4406 | printf_filtered ("cwd = '%s'\n", fname2); | |
4407 | else | |
8a3fe4f8 | 4408 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4409 | } |
4410 | if (exe_f || all) | |
4411 | { | |
89ecc4f5 | 4412 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4413 | memset (fname2, 0, sizeof (fname2)); |
4414 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4415 | printf_filtered ("exe = '%s'\n", fname2); | |
4416 | else | |
8a3fe4f8 | 4417 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4418 | } |
4419 | if (mappings_f || all) | |
4420 | { | |
89ecc4f5 | 4421 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4422 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4423 | { |
4424 | long long addr, endaddr, size, offset, inode; | |
4425 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4426 | struct cleanup *cleanup; |
dba24537 | 4427 | |
7c8a8b04 | 4428 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4429 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4430 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4431 | { |
4432 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4433 | "Start Addr", | |
4434 | " End Addr", | |
4435 | " Size", " Offset", "objfile"); | |
4436 | } | |
4437 | else | |
4438 | { | |
4439 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4440 | "Start Addr", | |
4441 | " End Addr", | |
4442 | " Size", " Offset", "objfile"); | |
4443 | } | |
4444 | ||
4445 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4446 | &offset, &device[0], &inode, &filename[0])) | |
4447 | { | |
4448 | size = endaddr - addr; | |
4449 | ||
4450 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4451 | calls here (and possibly above) should be abstracted | |
4452 | out into their own functions? Andrew suggests using | |
4453 | a generic local_address_string instead to print out | |
4454 | the addresses; that makes sense to me, too. */ | |
4455 | ||
a97b0ac8 | 4456 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4457 | { |
4458 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4459 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4460 | (unsigned long) endaddr, | |
4461 | (int) size, | |
4462 | (unsigned int) offset, | |
4463 | filename[0] ? filename : ""); | |
4464 | } | |
4465 | else | |
4466 | { | |
4467 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4468 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4469 | (unsigned long) endaddr, | |
4470 | (int) size, | |
4471 | (unsigned int) offset, | |
4472 | filename[0] ? filename : ""); | |
4473 | } | |
4474 | } | |
4475 | ||
7c8a8b04 | 4476 | do_cleanups (cleanup); |
dba24537 AC |
4477 | } |
4478 | else | |
8a3fe4f8 | 4479 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4480 | } |
4481 | if (status_f || all) | |
4482 | { | |
89ecc4f5 | 4483 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4484 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4485 | { |
7c8a8b04 | 4486 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4487 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4488 | puts_filtered (buffer); | |
7c8a8b04 | 4489 | do_cleanups (cleanup); |
dba24537 AC |
4490 | } |
4491 | else | |
8a3fe4f8 | 4492 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4493 | } |
4494 | if (stat_f || all) | |
4495 | { | |
89ecc4f5 | 4496 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4497 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4498 | { |
4499 | int itmp; | |
4500 | char ctmp; | |
a25694b4 | 4501 | long ltmp; |
7c8a8b04 | 4502 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4503 | |
4504 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4505 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4506 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4507 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4508 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4509 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4510 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4511 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4512 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4513 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4514 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4515 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4516 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4517 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4518 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4519 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4520 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4521 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4522 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4523 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4524 | (unsigned long) ltmp); | |
4525 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4526 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4527 | (unsigned long) ltmp); | |
4528 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4529 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4530 | (unsigned long) ltmp); | |
4531 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4532 | printf_filtered (_("Major faults, children: %lu\n"), | |
4533 | (unsigned long) ltmp); | |
4534 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4535 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4536 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4537 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4538 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4539 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4540 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4541 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4542 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4543 | printf_filtered (_("jiffies remaining in current time slice: %ld\n"), | |
4544 | ltmp); | |
4545 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4546 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4547 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4548 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4549 | (unsigned long) ltmp); | |
4550 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4551 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4552 | (unsigned long) ltmp); | |
4553 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4554 | printf_filtered (_("start time (jiffies since system boot): %ld\n"), | |
4555 | ltmp); | |
4556 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4557 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4558 | (unsigned long) ltmp); | |
4559 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4560 | printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp); | |
4561 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4562 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4563 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4564 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4565 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4566 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4567 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4568 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
dba24537 AC |
4569 | #if 0 /* Don't know how architecture-dependent the rest is... |
4570 | Anyway the signal bitmap info is available from "status". */ | |
a25694b4 AS |
4571 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
4572 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); | |
4573 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
4574 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); | |
4575 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4576 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
4577 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4578 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
4579 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4580 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
4581 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4582 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
4583 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
4584 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); | |
dba24537 | 4585 | #endif |
7c8a8b04 | 4586 | do_cleanups (cleanup); |
dba24537 AC |
4587 | } |
4588 | else | |
8a3fe4f8 | 4589 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4590 | } |
4591 | } | |
4592 | ||
10d6c8cd DJ |
4593 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
4594 | filesystem. Because we can use a single read() call for /proc, this | |
4595 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
4596 | but it doesn't support writes. */ | |
4597 | ||
4598 | static LONGEST | |
4599 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
4600 | const char *annex, gdb_byte *readbuf, | |
4601 | const gdb_byte *writebuf, | |
4602 | ULONGEST offset, LONGEST len) | |
dba24537 | 4603 | { |
10d6c8cd DJ |
4604 | LONGEST ret; |
4605 | int fd; | |
dba24537 AC |
4606 | char filename[64]; |
4607 | ||
10d6c8cd | 4608 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
4609 | return 0; |
4610 | ||
4611 | /* Don't bother for one word. */ | |
4612 | if (len < 3 * sizeof (long)) | |
4613 | return 0; | |
4614 | ||
4615 | /* We could keep this file open and cache it - possibly one per | |
4616 | thread. That requires some juggling, but is even faster. */ | |
4617 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
4618 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
4619 | if (fd == -1) | |
4620 | return 0; | |
4621 | ||
4622 | /* If pread64 is available, use it. It's faster if the kernel | |
4623 | supports it (only one syscall), and it's 64-bit safe even on | |
4624 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4625 | application). */ | |
4626 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4627 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4628 | #else |
10d6c8cd | 4629 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4630 | #endif |
4631 | ret = 0; | |
4632 | else | |
4633 | ret = len; | |
4634 | ||
4635 | close (fd); | |
4636 | return ret; | |
4637 | } | |
4638 | ||
efcbbd14 UW |
4639 | |
4640 | /* Enumerate spufs IDs for process PID. */ | |
4641 | static LONGEST | |
4642 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
4643 | { | |
4644 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
4645 | LONGEST pos = 0; | |
4646 | LONGEST written = 0; | |
4647 | char path[128]; | |
4648 | DIR *dir; | |
4649 | struct dirent *entry; | |
4650 | ||
4651 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4652 | dir = opendir (path); | |
4653 | if (!dir) | |
4654 | return -1; | |
4655 | ||
4656 | rewinddir (dir); | |
4657 | while ((entry = readdir (dir)) != NULL) | |
4658 | { | |
4659 | struct stat st; | |
4660 | struct statfs stfs; | |
4661 | int fd; | |
4662 | ||
4663 | fd = atoi (entry->d_name); | |
4664 | if (!fd) | |
4665 | continue; | |
4666 | ||
4667 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4668 | if (stat (path, &st) != 0) | |
4669 | continue; | |
4670 | if (!S_ISDIR (st.st_mode)) | |
4671 | continue; | |
4672 | ||
4673 | if (statfs (path, &stfs) != 0) | |
4674 | continue; | |
4675 | if (stfs.f_type != SPUFS_MAGIC) | |
4676 | continue; | |
4677 | ||
4678 | if (pos >= offset && pos + 4 <= offset + len) | |
4679 | { | |
4680 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
4681 | written += 4; | |
4682 | } | |
4683 | pos += 4; | |
4684 | } | |
4685 | ||
4686 | closedir (dir); | |
4687 | return written; | |
4688 | } | |
4689 | ||
4690 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4691 | object type, using the /proc file system. */ | |
4692 | static LONGEST | |
4693 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
4694 | const char *annex, gdb_byte *readbuf, | |
4695 | const gdb_byte *writebuf, | |
4696 | ULONGEST offset, LONGEST len) | |
4697 | { | |
4698 | char buf[128]; | |
4699 | int fd = 0; | |
4700 | int ret = -1; | |
4701 | int pid = PIDGET (inferior_ptid); | |
4702 | ||
4703 | if (!annex) | |
4704 | { | |
4705 | if (!readbuf) | |
4706 | return -1; | |
4707 | else | |
4708 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4709 | } | |
4710 | ||
4711 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
4712 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4713 | if (fd <= 0) | |
4714 | return -1; | |
4715 | ||
4716 | if (offset != 0 | |
4717 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4718 | { | |
4719 | close (fd); | |
4720 | return 0; | |
4721 | } | |
4722 | ||
4723 | if (writebuf) | |
4724 | ret = write (fd, writebuf, (size_t) len); | |
4725 | else if (readbuf) | |
4726 | ret = read (fd, readbuf, (size_t) len); | |
4727 | ||
4728 | close (fd); | |
4729 | return ret; | |
4730 | } | |
4731 | ||
4732 | ||
dba24537 AC |
4733 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
4734 | ||
4735 | static void | |
4736 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4737 | { | |
4738 | int len = strlen (line) - 1; | |
4739 | const char *p; | |
4740 | int signum; | |
4741 | ||
4742 | if (line[len] != '\n') | |
8a3fe4f8 | 4743 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4744 | |
4745 | p = line; | |
4746 | signum = len * 4; | |
4747 | while (len-- > 0) | |
4748 | { | |
4749 | int digit; | |
4750 | ||
4751 | if (*p >= '0' && *p <= '9') | |
4752 | digit = *p - '0'; | |
4753 | else if (*p >= 'a' && *p <= 'f') | |
4754 | digit = *p - 'a' + 10; | |
4755 | else | |
8a3fe4f8 | 4756 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4757 | |
4758 | signum -= 4; | |
4759 | ||
4760 | if (digit & 1) | |
4761 | sigaddset (sigs, signum + 1); | |
4762 | if (digit & 2) | |
4763 | sigaddset (sigs, signum + 2); | |
4764 | if (digit & 4) | |
4765 | sigaddset (sigs, signum + 3); | |
4766 | if (digit & 8) | |
4767 | sigaddset (sigs, signum + 4); | |
4768 | ||
4769 | p++; | |
4770 | } | |
4771 | } | |
4772 | ||
4773 | /* Find process PID's pending signals from /proc/pid/status and set | |
4774 | SIGS to match. */ | |
4775 | ||
4776 | void | |
4777 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
4778 | { | |
4779 | FILE *procfile; | |
4780 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
4781 | int signum; | |
7c8a8b04 | 4782 | struct cleanup *cleanup; |
dba24537 AC |
4783 | |
4784 | sigemptyset (pending); | |
4785 | sigemptyset (blocked); | |
4786 | sigemptyset (ignored); | |
4787 | sprintf (fname, "/proc/%d/status", pid); | |
4788 | procfile = fopen (fname, "r"); | |
4789 | if (procfile == NULL) | |
8a3fe4f8 | 4790 | error (_("Could not open %s"), fname); |
7c8a8b04 | 4791 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4792 | |
4793 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
4794 | { | |
4795 | /* Normal queued signals are on the SigPnd line in the status | |
4796 | file. However, 2.6 kernels also have a "shared" pending | |
4797 | queue for delivering signals to a thread group, so check for | |
4798 | a ShdPnd line also. | |
4799 | ||
4800 | Unfortunately some Red Hat kernels include the shared pending | |
4801 | queue but not the ShdPnd status field. */ | |
4802 | ||
4803 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
4804 | add_line_to_sigset (buffer + 8, pending); | |
4805 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
4806 | add_line_to_sigset (buffer + 8, pending); | |
4807 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
4808 | add_line_to_sigset (buffer + 8, blocked); | |
4809 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
4810 | add_line_to_sigset (buffer + 8, ignored); | |
4811 | } | |
4812 | ||
7c8a8b04 | 4813 | do_cleanups (cleanup); |
dba24537 AC |
4814 | } |
4815 | ||
07e059b5 VP |
4816 | static LONGEST |
4817 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
4818 | const char *annex, gdb_byte *readbuf, | |
4819 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4820 | { | |
4821 | /* We make the process list snapshot when the object starts to be | |
4822 | read. */ | |
4823 | static const char *buf; | |
4824 | static LONGEST len_avail = -1; | |
4825 | static struct obstack obstack; | |
4826 | ||
4827 | DIR *dirp; | |
4828 | ||
4829 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
4830 | ||
4831 | if (strcmp (annex, "processes") != 0) | |
4832 | return 0; | |
4833 | ||
4834 | gdb_assert (readbuf && !writebuf); | |
4835 | ||
4836 | if (offset == 0) | |
4837 | { | |
4838 | if (len_avail != -1 && len_avail != 0) | |
4839 | obstack_free (&obstack, NULL); | |
4840 | len_avail = 0; | |
4841 | buf = NULL; | |
4842 | obstack_init (&obstack); | |
4843 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
4844 | ||
4845 | dirp = opendir ("/proc"); | |
4846 | if (dirp) | |
4847 | { | |
4848 | struct dirent *dp; | |
4849 | while ((dp = readdir (dirp)) != NULL) | |
4850 | { | |
4851 | struct stat statbuf; | |
4852 | char procentry[sizeof ("/proc/4294967295")]; | |
4853 | ||
4854 | if (!isdigit (dp->d_name[0]) | |
1a6d2f2f | 4855 | || NAMELEN (dp) > sizeof ("4294967295") - 1) |
07e059b5 VP |
4856 | continue; |
4857 | ||
4858 | sprintf (procentry, "/proc/%s", dp->d_name); | |
4859 | if (stat (procentry, &statbuf) == 0 | |
4860 | && S_ISDIR (statbuf.st_mode)) | |
4861 | { | |
4862 | char *pathname; | |
4863 | FILE *f; | |
4864 | char cmd[MAXPATHLEN + 1]; | |
4865 | struct passwd *entry; | |
4866 | ||
4867 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
4868 | entry = getpwuid (statbuf.st_uid); | |
4869 | ||
4870 | if ((f = fopen (pathname, "r")) != NULL) | |
4871 | { | |
4872 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
4873 | if (len > 0) | |
4874 | { | |
4875 | int i; | |
4876 | for (i = 0; i < len; i++) | |
4877 | if (cmd[i] == '\0') | |
4878 | cmd[i] = ' '; | |
4879 | cmd[len] = '\0'; | |
4880 | ||
4881 | obstack_xml_printf ( | |
4882 | &obstack, | |
4883 | "<item>" | |
4884 | "<column name=\"pid\">%s</column>" | |
4885 | "<column name=\"user\">%s</column>" | |
4886 | "<column name=\"command\">%s</column>" | |
4887 | "</item>", | |
4888 | dp->d_name, | |
4889 | entry ? entry->pw_name : "?", | |
4890 | cmd); | |
4891 | } | |
4892 | fclose (f); | |
4893 | } | |
4894 | ||
4895 | xfree (pathname); | |
4896 | } | |
4897 | } | |
4898 | ||
4899 | closedir (dirp); | |
4900 | } | |
4901 | ||
4902 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
4903 | buf = obstack_finish (&obstack); | |
4904 | len_avail = strlen (buf); | |
4905 | } | |
4906 | ||
4907 | if (offset >= len_avail) | |
4908 | { | |
4909 | /* Done. Get rid of the obstack. */ | |
4910 | obstack_free (&obstack, NULL); | |
4911 | buf = NULL; | |
4912 | len_avail = 0; | |
4913 | return 0; | |
4914 | } | |
4915 | ||
4916 | if (len > len_avail - offset) | |
4917 | len = len_avail - offset; | |
4918 | memcpy (readbuf, buf + offset, len); | |
4919 | ||
4920 | return len; | |
4921 | } | |
4922 | ||
10d6c8cd DJ |
4923 | static LONGEST |
4924 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
4925 | const char *annex, gdb_byte *readbuf, | |
4926 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4927 | { | |
4928 | LONGEST xfer; | |
4929 | ||
4930 | if (object == TARGET_OBJECT_AUXV) | |
4931 | return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf, | |
4932 | offset, len); | |
4933 | ||
07e059b5 VP |
4934 | if (object == TARGET_OBJECT_OSDATA) |
4935 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
4936 | offset, len); | |
4937 | ||
efcbbd14 UW |
4938 | if (object == TARGET_OBJECT_SPU) |
4939 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
4940 | offset, len); | |
4941 | ||
8f313923 JK |
4942 | /* GDB calculates all the addresses in possibly larget width of the address. |
4943 | Address width needs to be masked before its final use - either by | |
4944 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
4945 | ||
4946 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
4947 | ||
4948 | if (object == TARGET_OBJECT_MEMORY) | |
4949 | { | |
4950 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
4951 | ||
4952 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
4953 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
4954 | } | |
4955 | ||
10d6c8cd DJ |
4956 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
4957 | offset, len); | |
4958 | if (xfer != 0) | |
4959 | return xfer; | |
4960 | ||
4961 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
4962 | offset, len); | |
4963 | } | |
4964 | ||
e9efe249 | 4965 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
4966 | it with local methods. */ |
4967 | ||
910122bf UW |
4968 | static void |
4969 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 4970 | { |
6d8fd2b7 UW |
4971 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
4972 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; | |
4973 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; | |
a96d9b2e | 4974 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 4975 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 4976 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
4977 | t->to_post_attach = linux_child_post_attach; |
4978 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
4979 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
4980 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
4981 | ||
4982 | super_xfer_partial = t->to_xfer_partial; | |
4983 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
4984 | } |
4985 | ||
4986 | struct target_ops * | |
4987 | linux_target (void) | |
4988 | { | |
4989 | struct target_ops *t; | |
4990 | ||
4991 | t = inf_ptrace_target (); | |
4992 | linux_target_install_ops (t); | |
4993 | ||
4994 | return t; | |
4995 | } | |
4996 | ||
4997 | struct target_ops * | |
7714d83a | 4998 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
4999 | { |
5000 | struct target_ops *t; | |
5001 | ||
5002 | t = inf_ptrace_trad_target (register_u_offset); | |
5003 | linux_target_install_ops (t); | |
10d6c8cd | 5004 | |
10d6c8cd DJ |
5005 | return t; |
5006 | } | |
5007 | ||
b84876c2 PA |
5008 | /* target_is_async_p implementation. */ |
5009 | ||
5010 | static int | |
5011 | linux_nat_is_async_p (void) | |
5012 | { | |
5013 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5014 | it explicitly with the "set target-async" command. |
b84876c2 | 5015 | Someday, linux will always be async. */ |
c6ebd6cf | 5016 | if (!target_async_permitted) |
b84876c2 PA |
5017 | return 0; |
5018 | ||
d90e17a7 PA |
5019 | /* See target.h/target_async_mask. */ |
5020 | return linux_nat_async_mask_value; | |
b84876c2 PA |
5021 | } |
5022 | ||
5023 | /* target_can_async_p implementation. */ | |
5024 | ||
5025 | static int | |
5026 | linux_nat_can_async_p (void) | |
5027 | { | |
5028 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5029 | it explicitly with the "set target-async" command. |
b84876c2 | 5030 | Someday, linux will always be async. */ |
c6ebd6cf | 5031 | if (!target_async_permitted) |
b84876c2 PA |
5032 | return 0; |
5033 | ||
5034 | /* See target.h/target_async_mask. */ | |
5035 | return linux_nat_async_mask_value; | |
5036 | } | |
5037 | ||
9908b566 VP |
5038 | static int |
5039 | linux_nat_supports_non_stop (void) | |
5040 | { | |
5041 | return 1; | |
5042 | } | |
5043 | ||
d90e17a7 PA |
5044 | /* True if we want to support multi-process. To be removed when GDB |
5045 | supports multi-exec. */ | |
5046 | ||
2277426b | 5047 | int linux_multi_process = 1; |
d90e17a7 PA |
5048 | |
5049 | static int | |
5050 | linux_nat_supports_multi_process (void) | |
5051 | { | |
5052 | return linux_multi_process; | |
5053 | } | |
5054 | ||
b84876c2 PA |
5055 | /* target_async_mask implementation. */ |
5056 | ||
5057 | static int | |
7feb7d06 | 5058 | linux_nat_async_mask (int new_mask) |
b84876c2 | 5059 | { |
7feb7d06 | 5060 | int curr_mask = linux_nat_async_mask_value; |
b84876c2 | 5061 | |
7feb7d06 | 5062 | if (curr_mask != new_mask) |
b84876c2 | 5063 | { |
7feb7d06 | 5064 | if (new_mask == 0) |
b84876c2 PA |
5065 | { |
5066 | linux_nat_async (NULL, 0); | |
7feb7d06 | 5067 | linux_nat_async_mask_value = new_mask; |
b84876c2 PA |
5068 | } |
5069 | else | |
5070 | { | |
7feb7d06 | 5071 | linux_nat_async_mask_value = new_mask; |
84e46146 | 5072 | |
7feb7d06 PA |
5073 | /* If we're going out of async-mask in all-stop, then the |
5074 | inferior is stopped. The next resume will call | |
5075 | target_async. In non-stop, the target event source | |
5076 | should be always registered in the event loop. Do so | |
5077 | now. */ | |
5078 | if (non_stop) | |
5079 | linux_nat_async (inferior_event_handler, 0); | |
b84876c2 PA |
5080 | } |
5081 | } | |
5082 | ||
7feb7d06 | 5083 | return curr_mask; |
b84876c2 PA |
5084 | } |
5085 | ||
5086 | static int async_terminal_is_ours = 1; | |
5087 | ||
5088 | /* target_terminal_inferior implementation. */ | |
5089 | ||
5090 | static void | |
5091 | linux_nat_terminal_inferior (void) | |
5092 | { | |
5093 | if (!target_is_async_p ()) | |
5094 | { | |
5095 | /* Async mode is disabled. */ | |
5096 | terminal_inferior (); | |
5097 | return; | |
5098 | } | |
5099 | ||
b84876c2 PA |
5100 | terminal_inferior (); |
5101 | ||
d9d2d8b6 | 5102 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
5103 | if (!async_terminal_is_ours) |
5104 | return; | |
5105 | ||
5106 | delete_file_handler (input_fd); | |
5107 | async_terminal_is_ours = 0; | |
5108 | set_sigint_trap (); | |
5109 | } | |
5110 | ||
5111 | /* target_terminal_ours implementation. */ | |
5112 | ||
2c0b251b | 5113 | static void |
b84876c2 PA |
5114 | linux_nat_terminal_ours (void) |
5115 | { | |
5116 | if (!target_is_async_p ()) | |
5117 | { | |
5118 | /* Async mode is disabled. */ | |
5119 | terminal_ours (); | |
5120 | return; | |
5121 | } | |
5122 | ||
5123 | /* GDB should never give the terminal to the inferior if the | |
5124 | inferior is running in the background (run&, continue&, etc.), | |
5125 | but claiming it sure should. */ | |
5126 | terminal_ours (); | |
5127 | ||
b84876c2 PA |
5128 | if (async_terminal_is_ours) |
5129 | return; | |
5130 | ||
5131 | clear_sigint_trap (); | |
5132 | add_file_handler (input_fd, stdin_event_handler, 0); | |
5133 | async_terminal_is_ours = 1; | |
5134 | } | |
5135 | ||
5136 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
5137 | void *context); | |
5138 | static void *async_client_context; | |
5139 | ||
7feb7d06 PA |
5140 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5141 | so we notice when any child changes state, and notify the | |
5142 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
5143 | above to wait for the arrival of a SIGCHLD. */ | |
5144 | ||
b84876c2 | 5145 | static void |
7feb7d06 | 5146 | sigchld_handler (int signo) |
b84876c2 | 5147 | { |
7feb7d06 PA |
5148 | int old_errno = errno; |
5149 | ||
5150 | if (debug_linux_nat_async) | |
5151 | fprintf_unfiltered (gdb_stdlog, "sigchld\n"); | |
5152 | ||
5153 | if (signo == SIGCHLD | |
5154 | && linux_nat_event_pipe[0] != -1) | |
5155 | async_file_mark (); /* Let the event loop know that there are | |
5156 | events to handle. */ | |
5157 | ||
5158 | errno = old_errno; | |
5159 | } | |
5160 | ||
5161 | /* Callback registered with the target events file descriptor. */ | |
5162 | ||
5163 | static void | |
5164 | handle_target_event (int error, gdb_client_data client_data) | |
5165 | { | |
5166 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
5167 | } | |
5168 | ||
5169 | /* Create/destroy the target events pipe. Returns previous state. */ | |
5170 | ||
5171 | static int | |
5172 | linux_async_pipe (int enable) | |
5173 | { | |
5174 | int previous = (linux_nat_event_pipe[0] != -1); | |
5175 | ||
5176 | if (previous != enable) | |
5177 | { | |
5178 | sigset_t prev_mask; | |
5179 | ||
5180 | block_child_signals (&prev_mask); | |
5181 | ||
5182 | if (enable) | |
5183 | { | |
5184 | if (pipe (linux_nat_event_pipe) == -1) | |
5185 | internal_error (__FILE__, __LINE__, | |
5186 | "creating event pipe failed."); | |
5187 | ||
5188 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5189 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5190 | } | |
5191 | else | |
5192 | { | |
5193 | close (linux_nat_event_pipe[0]); | |
5194 | close (linux_nat_event_pipe[1]); | |
5195 | linux_nat_event_pipe[0] = -1; | |
5196 | linux_nat_event_pipe[1] = -1; | |
5197 | } | |
5198 | ||
5199 | restore_child_signals_mask (&prev_mask); | |
5200 | } | |
5201 | ||
5202 | return previous; | |
b84876c2 PA |
5203 | } |
5204 | ||
5205 | /* target_async implementation. */ | |
5206 | ||
5207 | static void | |
5208 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
5209 | void *context), void *context) | |
5210 | { | |
c6ebd6cf | 5211 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
5212 | internal_error (__FILE__, __LINE__, |
5213 | "Calling target_async when async is masked"); | |
5214 | ||
5215 | if (callback != NULL) | |
5216 | { | |
5217 | async_client_callback = callback; | |
5218 | async_client_context = context; | |
7feb7d06 PA |
5219 | if (!linux_async_pipe (1)) |
5220 | { | |
5221 | add_file_handler (linux_nat_event_pipe[0], | |
5222 | handle_target_event, NULL); | |
5223 | /* There may be pending events to handle. Tell the event loop | |
5224 | to poll them. */ | |
5225 | async_file_mark (); | |
5226 | } | |
b84876c2 PA |
5227 | } |
5228 | else | |
5229 | { | |
5230 | async_client_callback = callback; | |
5231 | async_client_context = context; | |
b84876c2 | 5232 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 5233 | linux_async_pipe (0); |
b84876c2 PA |
5234 | } |
5235 | return; | |
5236 | } | |
5237 | ||
252fbfc8 PA |
5238 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
5239 | event came out. */ | |
5240 | ||
4c28f408 | 5241 | static int |
252fbfc8 | 5242 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 5243 | { |
d90e17a7 | 5244 | if (!lwp->stopped) |
252fbfc8 | 5245 | { |
d90e17a7 PA |
5246 | int pid, status; |
5247 | ptid_t ptid = lwp->ptid; | |
252fbfc8 | 5248 | |
d90e17a7 PA |
5249 | if (debug_linux_nat) |
5250 | fprintf_unfiltered (gdb_stdlog, | |
5251 | "LNSL: running -> suspending %s\n", | |
5252 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 5253 | |
252fbfc8 | 5254 | |
d90e17a7 PA |
5255 | stop_callback (lwp, NULL); |
5256 | stop_wait_callback (lwp, NULL); | |
252fbfc8 | 5257 | |
d90e17a7 PA |
5258 | /* If the lwp exits while we try to stop it, there's nothing |
5259 | else to do. */ | |
5260 | lwp = find_lwp_pid (ptid); | |
5261 | if (lwp == NULL) | |
5262 | return 0; | |
252fbfc8 | 5263 | |
d90e17a7 PA |
5264 | /* If we didn't collect any signal other than SIGSTOP while |
5265 | stopping the LWP, push a SIGNAL_0 event. In either case, the | |
5266 | event-loop will end up calling target_wait which will collect | |
5267 | these. */ | |
5268 | if (lwp->status == 0) | |
5269 | lwp->status = W_STOPCODE (0); | |
5270 | async_file_mark (); | |
5271 | } | |
5272 | else | |
5273 | { | |
5274 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 5275 | |
d90e17a7 PA |
5276 | if (debug_linux_nat) |
5277 | { | |
e09875d4 | 5278 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
d90e17a7 | 5279 | fprintf_unfiltered (gdb_stdlog, "\ |
252fbfc8 | 5280 | LNSL: already stopped/stop_requested %s\n", |
d90e17a7 PA |
5281 | target_pid_to_str (lwp->ptid)); |
5282 | else | |
5283 | fprintf_unfiltered (gdb_stdlog, "\ | |
252fbfc8 | 5284 | LNSL: already stopped/no stop_requested yet %s\n", |
d90e17a7 | 5285 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
5286 | } |
5287 | } | |
4c28f408 PA |
5288 | return 0; |
5289 | } | |
5290 | ||
5291 | static void | |
5292 | linux_nat_stop (ptid_t ptid) | |
5293 | { | |
5294 | if (non_stop) | |
d90e17a7 | 5295 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
5296 | else |
5297 | linux_ops->to_stop (ptid); | |
5298 | } | |
5299 | ||
d90e17a7 PA |
5300 | static void |
5301 | linux_nat_close (int quitting) | |
5302 | { | |
5303 | /* Unregister from the event loop. */ | |
5304 | if (target_is_async_p ()) | |
5305 | target_async (NULL, 0); | |
5306 | ||
5307 | /* Reset the async_masking. */ | |
5308 | linux_nat_async_mask_value = 1; | |
5309 | ||
5310 | if (linux_ops->to_close) | |
5311 | linux_ops->to_close (quitting); | |
5312 | } | |
5313 | ||
c0694254 PA |
5314 | /* When requests are passed down from the linux-nat layer to the |
5315 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
5316 | used. The address space pointer is stored in the inferior object, | |
5317 | but the common code that is passed such ptid can't tell whether | |
5318 | lwpid is a "main" process id or not (it assumes so). We reverse | |
5319 | look up the "main" process id from the lwp here. */ | |
5320 | ||
5321 | struct address_space * | |
5322 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) | |
5323 | { | |
5324 | struct lwp_info *lwp; | |
5325 | struct inferior *inf; | |
5326 | int pid; | |
5327 | ||
5328 | pid = GET_LWP (ptid); | |
5329 | if (GET_LWP (ptid) == 0) | |
5330 | { | |
5331 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
5332 | tgid. */ | |
5333 | lwp = find_lwp_pid (ptid); | |
5334 | pid = GET_PID (lwp->ptid); | |
5335 | } | |
5336 | else | |
5337 | { | |
5338 | /* A (pid,lwpid,0) ptid. */ | |
5339 | pid = GET_PID (ptid); | |
5340 | } | |
5341 | ||
5342 | inf = find_inferior_pid (pid); | |
5343 | gdb_assert (inf != NULL); | |
5344 | return inf->aspace; | |
5345 | } | |
5346 | ||
f973ed9c DJ |
5347 | void |
5348 | linux_nat_add_target (struct target_ops *t) | |
5349 | { | |
f973ed9c DJ |
5350 | /* Save the provided single-threaded target. We save this in a separate |
5351 | variable because another target we've inherited from (e.g. inf-ptrace) | |
5352 | may have saved a pointer to T; we want to use it for the final | |
5353 | process stratum target. */ | |
5354 | linux_ops_saved = *t; | |
5355 | linux_ops = &linux_ops_saved; | |
5356 | ||
5357 | /* Override some methods for multithreading. */ | |
b84876c2 | 5358 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
5359 | t->to_attach = linux_nat_attach; |
5360 | t->to_detach = linux_nat_detach; | |
5361 | t->to_resume = linux_nat_resume; | |
5362 | t->to_wait = linux_nat_wait; | |
5363 | t->to_xfer_partial = linux_nat_xfer_partial; | |
5364 | t->to_kill = linux_nat_kill; | |
5365 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
5366 | t->to_thread_alive = linux_nat_thread_alive; | |
5367 | t->to_pid_to_str = linux_nat_pid_to_str; | |
5368 | t->to_has_thread_control = tc_schedlock; | |
c0694254 | 5369 | t->to_thread_address_space = linux_nat_thread_address_space; |
f973ed9c | 5370 | |
b84876c2 PA |
5371 | t->to_can_async_p = linux_nat_can_async_p; |
5372 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5373 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
5374 | t->to_async = linux_nat_async; |
5375 | t->to_async_mask = linux_nat_async_mask; | |
5376 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
5377 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5378 | t->to_close = linux_nat_close; |
b84876c2 | 5379 | |
4c28f408 PA |
5380 | /* Methods for non-stop support. */ |
5381 | t->to_stop = linux_nat_stop; | |
5382 | ||
d90e17a7 PA |
5383 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5384 | ||
f973ed9c DJ |
5385 | /* We don't change the stratum; this target will sit at |
5386 | process_stratum and thread_db will set at thread_stratum. This | |
5387 | is a little strange, since this is a multi-threaded-capable | |
5388 | target, but we want to be on the stack below thread_db, and we | |
5389 | also want to be used for single-threaded processes. */ | |
5390 | ||
5391 | add_target (t); | |
f973ed9c DJ |
5392 | } |
5393 | ||
9f0bdab8 DJ |
5394 | /* Register a method to call whenever a new thread is attached. */ |
5395 | void | |
5396 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5397 | { | |
5398 | /* Save the pointer. We only support a single registered instance | |
5399 | of the GNU/Linux native target, so we do not need to map this to | |
5400 | T. */ | |
5401 | linux_nat_new_thread = new_thread; | |
5402 | } | |
5403 | ||
5b009018 PA |
5404 | /* Register a method that converts a siginfo object between the layout |
5405 | that ptrace returns, and the layout in the architecture of the | |
5406 | inferior. */ | |
5407 | void | |
5408 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5409 | int (*siginfo_fixup) (struct siginfo *, | |
5410 | gdb_byte *, | |
5411 | int)) | |
5412 | { | |
5413 | /* Save the pointer. */ | |
5414 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5415 | } | |
5416 | ||
9f0bdab8 DJ |
5417 | /* Return the saved siginfo associated with PTID. */ |
5418 | struct siginfo * | |
5419 | linux_nat_get_siginfo (ptid_t ptid) | |
5420 | { | |
5421 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5422 | ||
5423 | gdb_assert (lp != NULL); | |
5424 | ||
5425 | return &lp->siginfo; | |
5426 | } | |
5427 | ||
2c0b251b PA |
5428 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5429 | extern initialize_file_ftype _initialize_linux_nat; | |
5430 | ||
d6b0e80f AC |
5431 | void |
5432 | _initialize_linux_nat (void) | |
5433 | { | |
b84876c2 | 5434 | sigset_t mask; |
dba24537 | 5435 | |
1bedd215 AC |
5436 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
5437 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
5438 | Specify any process id, or use the program being debugged by default.\n\ |
5439 | Specify any of the following keywords for detailed info:\n\ | |
5440 | mappings -- list of mapped memory regions.\n\ | |
5441 | stat -- list a bunch of random process info.\n\ | |
5442 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 5443 | all -- list all available /proc info.")); |
d6b0e80f | 5444 | |
b84876c2 PA |
5445 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5446 | &debug_linux_nat, _("\ | |
5447 | Set debugging of GNU/Linux lwp module."), _("\ | |
5448 | Show debugging of GNU/Linux lwp module."), _("\ | |
5449 | Enables printf debugging output."), | |
5450 | NULL, | |
5451 | show_debug_linux_nat, | |
5452 | &setdebuglist, &showdebuglist); | |
5453 | ||
5454 | add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance, | |
5455 | &debug_linux_nat_async, _("\ | |
5456 | Set debugging of GNU/Linux async lwp module."), _("\ | |
5457 | Show debugging of GNU/Linux async lwp module."), _("\ | |
5458 | Enables printf debugging output."), | |
5459 | NULL, | |
5460 | show_debug_linux_nat_async, | |
5461 | &setdebuglist, &showdebuglist); | |
5462 | ||
b84876c2 | 5463 | /* Save this mask as the default. */ |
d6b0e80f AC |
5464 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5465 | ||
7feb7d06 PA |
5466 | /* Install a SIGCHLD handler. */ |
5467 | sigchld_action.sa_handler = sigchld_handler; | |
5468 | sigemptyset (&sigchld_action.sa_mask); | |
5469 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5470 | |
5471 | /* Make it the default. */ | |
7feb7d06 | 5472 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5473 | |
5474 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5475 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5476 | sigdelset (&suspend_mask, SIGCHLD); | |
5477 | ||
7feb7d06 | 5478 | sigemptyset (&blocked_mask); |
10568435 JK |
5479 | |
5480 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
5481 | &disable_randomization, _("\ | |
5482 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
5483 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
5484 | When this mode is on (which is the default), randomization of the virtual\n\ | |
5485 | address space is disabled. Standalone programs run with the randomization\n\ | |
5486 | enabled by default on some platforms."), | |
5487 | &set_disable_randomization, | |
5488 | &show_disable_randomization, | |
5489 | &setlist, &showlist); | |
d6b0e80f AC |
5490 | } |
5491 | \f | |
5492 | ||
5493 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5494 | the GNU/Linux Threads library and therefore doesn't really belong | |
5495 | here. */ | |
5496 | ||
5497 | /* Read variable NAME in the target and return its value if found. | |
5498 | Otherwise return zero. It is assumed that the type of the variable | |
5499 | is `int'. */ | |
5500 | ||
5501 | static int | |
5502 | get_signo (const char *name) | |
5503 | { | |
5504 | struct minimal_symbol *ms; | |
5505 | int signo; | |
5506 | ||
5507 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5508 | if (ms == NULL) | |
5509 | return 0; | |
5510 | ||
8e70166d | 5511 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5512 | sizeof (signo)) != 0) |
5513 | return 0; | |
5514 | ||
5515 | return signo; | |
5516 | } | |
5517 | ||
5518 | /* Return the set of signals used by the threads library in *SET. */ | |
5519 | ||
5520 | void | |
5521 | lin_thread_get_thread_signals (sigset_t *set) | |
5522 | { | |
5523 | struct sigaction action; | |
5524 | int restart, cancel; | |
5525 | ||
b84876c2 | 5526 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5527 | sigemptyset (set); |
5528 | ||
5529 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5530 | cancel = get_signo ("__pthread_sig_cancel"); |
5531 | ||
5532 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5533 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5534 | not provide any way for the debugger to query the signal numbers - | |
5535 | fortunately they don't change! */ | |
5536 | ||
d6b0e80f | 5537 | if (restart == 0) |
17fbb0bd | 5538 | restart = __SIGRTMIN; |
d6b0e80f | 5539 | |
d6b0e80f | 5540 | if (cancel == 0) |
17fbb0bd | 5541 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5542 | |
5543 | sigaddset (set, restart); | |
5544 | sigaddset (set, cancel); | |
5545 | ||
5546 | /* The GNU/Linux Threads library makes terminating threads send a | |
5547 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
5548 | those (to prevent them from terminating GDB itself, which is | |
5549 | likely to be their default action) and treat them the same way as | |
5550 | SIGCHLD. */ | |
5551 | ||
5552 | action.sa_handler = sigchld_handler; | |
5553 | sigemptyset (&action.sa_mask); | |
58aecb61 | 5554 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
5555 | sigaction (cancel, &action, NULL); |
5556 | ||
5557 | /* We block the "cancel" signal throughout this code ... */ | |
5558 | sigaddset (&blocked_mask, cancel); | |
5559 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
5560 | ||
5561 | /* ... except during a sigsuspend. */ | |
5562 | sigdelset (&suspend_mask, cancel); | |
5563 | } |