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; | |
56710373 | 796 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
6c95b8df PA |
797 | |
798 | lp = find_lwp_pid (pid_to_ptid (parent_pid)); | |
b957e937 DJ |
799 | gdb_assert (linux_supports_tracefork_flag >= 0); |
800 | if (linux_supports_tracevforkdone (0)) | |
9016a515 | 801 | { |
6c95b8df PA |
802 | if (debug_linux_nat) |
803 | fprintf_unfiltered (gdb_stdlog, | |
804 | "LCFF: waiting for VFORK_DONE on %d\n", | |
805 | parent_pid); | |
806 | ||
807 | lp->stopped = 1; | |
808 | lp->resumed = 1; | |
9016a515 | 809 | |
6c95b8df PA |
810 | /* We'll handle the VFORK_DONE event like any other |
811 | event, in target_wait. */ | |
9016a515 DJ |
812 | } |
813 | else | |
814 | { | |
815 | /* We can't insert breakpoints until the child has | |
816 | finished with the shared memory region. We need to | |
817 | wait until that happens. Ideal would be to just | |
818 | call: | |
819 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
820 | - waitpid (parent_pid, &status, __WALL); | |
821 | However, most architectures can't handle a syscall | |
822 | being traced on the way out if it wasn't traced on | |
823 | the way in. | |
824 | ||
825 | We might also think to loop, continuing the child | |
826 | until it exits or gets a SIGTRAP. One problem is | |
827 | that the child might call ptrace with PTRACE_TRACEME. | |
828 | ||
829 | There's no simple and reliable way to figure out when | |
830 | the vforked child will be done with its copy of the | |
831 | shared memory. We could step it out of the syscall, | |
832 | two instructions, let it go, and then single-step the | |
833 | parent once. When we have hardware single-step, this | |
834 | would work; with software single-step it could still | |
835 | be made to work but we'd have to be able to insert | |
836 | single-step breakpoints in the child, and we'd have | |
837 | to insert -just- the single-step breakpoint in the | |
838 | parent. Very awkward. | |
839 | ||
840 | In the end, the best we can do is to make sure it | |
841 | runs for a little while. Hopefully it will be out of | |
842 | range of any breakpoints we reinsert. Usually this | |
843 | is only the single-step breakpoint at vfork's return | |
844 | point. */ | |
845 | ||
6c95b8df PA |
846 | if (debug_linux_nat) |
847 | fprintf_unfiltered (gdb_stdlog, | |
848 | "LCFF: no VFORK_DONE support, sleeping a bit\n"); | |
849 | ||
9016a515 | 850 | usleep (10000); |
9016a515 | 851 | |
6c95b8df PA |
852 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
853 | and leave it pending. The next linux_nat_resume call | |
854 | will notice a pending event, and bypasses actually | |
855 | resuming the inferior. */ | |
856 | lp->status = 0; | |
857 | lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
858 | lp->stopped = 0; | |
859 | lp->resumed = 1; | |
860 | ||
861 | /* If we're in async mode, need to tell the event loop | |
862 | there's something here to process. */ | |
863 | if (target_can_async_p ()) | |
864 | async_file_mark (); | |
865 | } | |
9016a515 | 866 | } |
4de4c07c | 867 | } |
3993f6b1 | 868 | else |
4de4c07c | 869 | { |
4e1c45ea | 870 | struct thread_info *tp; |
77435e4c | 871 | struct inferior *parent_inf, *child_inf; |
2277426b | 872 | struct lwp_info *lp; |
6c95b8df | 873 | struct program_space *parent_pspace; |
4de4c07c | 874 | |
e85a822c | 875 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
876 | { |
877 | target_terminal_ours (); | |
6c95b8df PA |
878 | if (has_vforked) |
879 | fprintf_filtered (gdb_stdlog, _("\ | |
880 | Attaching after process %d vfork to child process %d.\n"), | |
881 | parent_pid, child_pid); | |
882 | else | |
883 | fprintf_filtered (gdb_stdlog, _("\ | |
884 | Attaching after process %d fork to child process %d.\n"), | |
885 | parent_pid, child_pid); | |
f75c00e4 | 886 | } |
4de4c07c | 887 | |
7a7d3353 PA |
888 | /* Add the new inferior first, so that the target_detach below |
889 | doesn't unpush the target. */ | |
890 | ||
77435e4c PA |
891 | child_inf = add_inferior (child_pid); |
892 | ||
e58b0e63 | 893 | parent_inf = current_inferior (); |
77435e4c | 894 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 895 | copy_terminal_info (child_inf, parent_inf); |
7a7d3353 | 896 | |
6c95b8df | 897 | parent_pspace = parent_inf->pspace; |
9016a515 | 898 | |
6c95b8df PA |
899 | /* If we're vforking, we want to hold on to the parent until the |
900 | child exits or execs. At child exec or exit time we can | |
901 | remove the old breakpoints from the parent and detach or | |
902 | resume debugging it. Otherwise, detach the parent now; we'll | |
903 | want to reuse it's program/address spaces, but we can't set | |
904 | them to the child before removing breakpoints from the | |
905 | parent, otherwise, the breakpoints module could decide to | |
906 | remove breakpoints from the wrong process (since they'd be | |
907 | assigned to the same address space). */ | |
9016a515 DJ |
908 | |
909 | if (has_vforked) | |
7f9f62ba | 910 | { |
6c95b8df PA |
911 | gdb_assert (child_inf->vfork_parent == NULL); |
912 | gdb_assert (parent_inf->vfork_child == NULL); | |
913 | child_inf->vfork_parent = parent_inf; | |
914 | child_inf->pending_detach = 0; | |
915 | parent_inf->vfork_child = child_inf; | |
916 | parent_inf->pending_detach = detach_fork; | |
917 | parent_inf->waiting_for_vfork_done = 0; | |
ac264b3b | 918 | } |
2277426b | 919 | else if (detach_fork) |
b84876c2 | 920 | target_detach (NULL, 0); |
4de4c07c | 921 | |
6c95b8df PA |
922 | /* Note that the detach above makes PARENT_INF dangling. */ |
923 | ||
924 | /* Add the child thread to the appropriate lists, and switch to | |
925 | this new thread, before cloning the program space, and | |
926 | informing the solib layer about this new process. */ | |
927 | ||
9f0bdab8 | 928 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
2277426b PA |
929 | add_thread (inferior_ptid); |
930 | lp = add_lwp (inferior_ptid); | |
931 | lp->stopped = 1; | |
6c95b8df PA |
932 | lp->resumed = 1; |
933 | ||
934 | /* If this is a vfork child, then the address-space is shared | |
935 | with the parent. If we detached from the parent, then we can | |
936 | reuse the parent's program/address spaces. */ | |
937 | if (has_vforked || detach_fork) | |
938 | { | |
939 | child_inf->pspace = parent_pspace; | |
940 | child_inf->aspace = child_inf->pspace->aspace; | |
941 | } | |
942 | else | |
943 | { | |
944 | child_inf->aspace = new_address_space (); | |
945 | child_inf->pspace = add_program_space (child_inf->aspace); | |
946 | child_inf->removable = 1; | |
947 | set_current_program_space (child_inf->pspace); | |
948 | clone_program_space (child_inf->pspace, parent_pspace); | |
949 | ||
950 | /* Let the shared library layer (solib-svr4) learn about | |
951 | this new process, relocate the cloned exec, pull in | |
952 | shared libraries, and install the solib event breakpoint. | |
953 | If a "cloned-VM" event was propagated better throughout | |
954 | the core, this wouldn't be required. */ | |
955 | solib_create_inferior_hook (); | |
956 | } | |
ac264b3b | 957 | |
6c95b8df | 958 | /* Let the thread_db layer learn about this new process. */ |
ef29ce1a | 959 | check_for_thread_db (); |
4de4c07c DJ |
960 | } |
961 | ||
7feb7d06 | 962 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
963 | return 0; |
964 | } | |
965 | ||
4de4c07c | 966 | \f |
6d8fd2b7 UW |
967 | static void |
968 | linux_child_insert_fork_catchpoint (int pid) | |
4de4c07c | 969 | { |
b957e937 | 970 | if (! linux_supports_tracefork (pid)) |
8a3fe4f8 | 971 | error (_("Your system does not support fork catchpoints.")); |
3993f6b1 DJ |
972 | } |
973 | ||
6d8fd2b7 UW |
974 | static void |
975 | linux_child_insert_vfork_catchpoint (int pid) | |
3993f6b1 | 976 | { |
b957e937 | 977 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 978 | error (_("Your system does not support vfork catchpoints.")); |
3993f6b1 DJ |
979 | } |
980 | ||
6d8fd2b7 UW |
981 | static void |
982 | linux_child_insert_exec_catchpoint (int pid) | |
3993f6b1 | 983 | { |
b957e937 | 984 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 985 | error (_("Your system does not support exec catchpoints.")); |
3993f6b1 DJ |
986 | } |
987 | ||
a96d9b2e SDJ |
988 | static int |
989 | linux_child_set_syscall_catchpoint (int pid, int needed, int any_count, | |
990 | int table_size, int *table) | |
991 | { | |
992 | if (! linux_supports_tracesysgood (pid)) | |
993 | error (_("Your system does not support syscall catchpoints.")); | |
994 | /* On GNU/Linux, we ignore the arguments. It means that we only | |
995 | enable the syscall catchpoints, but do not disable them. | |
996 | ||
997 | Also, we do not use the `table' information because we do not | |
998 | filter system calls here. We let GDB do the logic for us. */ | |
999 | return 0; | |
1000 | } | |
1001 | ||
d6b0e80f AC |
1002 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
1003 | are processes sharing the same VM space. A multi-threaded process | |
1004 | is basically a group of such processes. However, such a grouping | |
1005 | is almost entirely a user-space issue; the kernel doesn't enforce | |
1006 | such a grouping at all (this might change in the future). In | |
1007 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
1008 | Threads library) to provide such a grouping. | |
1009 | ||
1010 | It is perfectly well possible to write a multi-threaded application | |
1011 | without the assistance of a threads library, by using the clone | |
1012 | system call directly. This module should be able to give some | |
1013 | rudimentary support for debugging such applications if developers | |
1014 | specify the CLONE_PTRACE flag in the clone system call, and are | |
1015 | using the Linux kernel 2.4 or above. | |
1016 | ||
1017 | Note that there are some peculiarities in GNU/Linux that affect | |
1018 | this code: | |
1019 | ||
1020 | - In general one should specify the __WCLONE flag to waitpid in | |
1021 | order to make it report events for any of the cloned processes | |
1022 | (and leave it out for the initial process). However, if a cloned | |
1023 | process has exited the exit status is only reported if the | |
1024 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
1025 | we cannot use it since GDB must work on older systems too. | |
1026 | ||
1027 | - When a traced, cloned process exits and is waited for by the | |
1028 | debugger, the kernel reassigns it to the original parent and | |
1029 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
1030 | library doesn't notice this, which leads to the "zombie problem": | |
1031 | When debugged a multi-threaded process that spawns a lot of | |
1032 | threads will run out of processes, even if the threads exit, | |
1033 | because the "zombies" stay around. */ | |
1034 | ||
1035 | /* List of known LWPs. */ | |
9f0bdab8 | 1036 | struct lwp_info *lwp_list; |
d6b0e80f AC |
1037 | \f |
1038 | ||
d6b0e80f AC |
1039 | /* Original signal mask. */ |
1040 | static sigset_t normal_mask; | |
1041 | ||
1042 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
1043 | _initialize_linux_nat. */ | |
1044 | static sigset_t suspend_mask; | |
1045 | ||
7feb7d06 PA |
1046 | /* Signals to block to make that sigsuspend work. */ |
1047 | static sigset_t blocked_mask; | |
1048 | ||
1049 | /* SIGCHLD action. */ | |
1050 | struct sigaction sigchld_action; | |
b84876c2 | 1051 | |
7feb7d06 PA |
1052 | /* Block child signals (SIGCHLD and linux threads signals), and store |
1053 | the previous mask in PREV_MASK. */ | |
84e46146 | 1054 | |
7feb7d06 PA |
1055 | static void |
1056 | block_child_signals (sigset_t *prev_mask) | |
1057 | { | |
1058 | /* Make sure SIGCHLD is blocked. */ | |
1059 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
1060 | sigaddset (&blocked_mask, SIGCHLD); | |
1061 | ||
1062 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
1063 | } | |
1064 | ||
1065 | /* Restore child signals mask, previously returned by | |
1066 | block_child_signals. */ | |
1067 | ||
1068 | static void | |
1069 | restore_child_signals_mask (sigset_t *prev_mask) | |
1070 | { | |
1071 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
1072 | } | |
d6b0e80f AC |
1073 | \f |
1074 | ||
1075 | /* Prototypes for local functions. */ | |
1076 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 1077 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 1078 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd PA |
1079 | static int cancel_breakpoint (struct lwp_info *lp); |
1080 | ||
d6b0e80f AC |
1081 | \f |
1082 | /* Convert wait status STATUS to a string. Used for printing debug | |
1083 | messages only. */ | |
1084 | ||
1085 | static char * | |
1086 | status_to_str (int status) | |
1087 | { | |
1088 | static char buf[64]; | |
1089 | ||
1090 | if (WIFSTOPPED (status)) | |
206aa767 | 1091 | { |
ca2163eb | 1092 | if (WSTOPSIG (status) == SYSCALL_SIGTRAP) |
206aa767 DE |
1093 | snprintf (buf, sizeof (buf), "%s (stopped at syscall)", |
1094 | strsignal (SIGTRAP)); | |
1095 | else | |
1096 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
1097 | strsignal (WSTOPSIG (status))); | |
1098 | } | |
d6b0e80f AC |
1099 | else if (WIFSIGNALED (status)) |
1100 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
1101 | strsignal (WSTOPSIG (status))); | |
1102 | else | |
1103 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
1104 | ||
1105 | return buf; | |
1106 | } | |
1107 | ||
1108 | /* Initialize the list of LWPs. Note that this module, contrary to | |
1109 | what GDB's generic threads layer does for its thread list, | |
1110 | re-initializes the LWP lists whenever we mourn or detach (which | |
1111 | doesn't involve mourning) the inferior. */ | |
1112 | ||
1113 | static void | |
1114 | init_lwp_list (void) | |
1115 | { | |
1116 | struct lwp_info *lp, *lpnext; | |
1117 | ||
1118 | for (lp = lwp_list; lp; lp = lpnext) | |
1119 | { | |
1120 | lpnext = lp->next; | |
1121 | xfree (lp); | |
1122 | } | |
1123 | ||
1124 | lwp_list = NULL; | |
d90e17a7 PA |
1125 | } |
1126 | ||
1127 | /* Remove all LWPs belong to PID from the lwp list. */ | |
1128 | ||
1129 | static void | |
1130 | purge_lwp_list (int pid) | |
1131 | { | |
1132 | struct lwp_info *lp, *lpprev, *lpnext; | |
1133 | ||
1134 | lpprev = NULL; | |
1135 | ||
1136 | for (lp = lwp_list; lp; lp = lpnext) | |
1137 | { | |
1138 | lpnext = lp->next; | |
1139 | ||
1140 | if (ptid_get_pid (lp->ptid) == pid) | |
1141 | { | |
1142 | if (lp == lwp_list) | |
1143 | lwp_list = lp->next; | |
1144 | else | |
1145 | lpprev->next = lp->next; | |
1146 | ||
1147 | xfree (lp); | |
1148 | } | |
1149 | else | |
1150 | lpprev = lp; | |
1151 | } | |
1152 | } | |
1153 | ||
1154 | /* Return the number of known LWPs in the tgid given by PID. */ | |
1155 | ||
1156 | static int | |
1157 | num_lwps (int pid) | |
1158 | { | |
1159 | int count = 0; | |
1160 | struct lwp_info *lp; | |
1161 | ||
1162 | for (lp = lwp_list; lp; lp = lp->next) | |
1163 | if (ptid_get_pid (lp->ptid) == pid) | |
1164 | count++; | |
1165 | ||
1166 | return count; | |
d6b0e80f AC |
1167 | } |
1168 | ||
f973ed9c | 1169 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1170 | structure describing the new LWP. The LWP should already be stopped |
1171 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1172 | |
1173 | static struct lwp_info * | |
1174 | add_lwp (ptid_t ptid) | |
1175 | { | |
1176 | struct lwp_info *lp; | |
1177 | ||
1178 | gdb_assert (is_lwp (ptid)); | |
1179 | ||
1180 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1181 | ||
1182 | memset (lp, 0, sizeof (struct lwp_info)); | |
1183 | ||
1184 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1185 | ||
1186 | lp->ptid = ptid; | |
1187 | ||
1188 | lp->next = lwp_list; | |
1189 | lwp_list = lp; | |
d6b0e80f | 1190 | |
d90e17a7 | 1191 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1192 | linux_nat_new_thread (ptid); |
1193 | ||
d6b0e80f AC |
1194 | return lp; |
1195 | } | |
1196 | ||
1197 | /* Remove the LWP specified by PID from the list. */ | |
1198 | ||
1199 | static void | |
1200 | delete_lwp (ptid_t ptid) | |
1201 | { | |
1202 | struct lwp_info *lp, *lpprev; | |
1203 | ||
1204 | lpprev = NULL; | |
1205 | ||
1206 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1207 | if (ptid_equal (lp->ptid, ptid)) | |
1208 | break; | |
1209 | ||
1210 | if (!lp) | |
1211 | return; | |
1212 | ||
d6b0e80f AC |
1213 | if (lpprev) |
1214 | lpprev->next = lp->next; | |
1215 | else | |
1216 | lwp_list = lp->next; | |
1217 | ||
1218 | xfree (lp); | |
1219 | } | |
1220 | ||
1221 | /* Return a pointer to the structure describing the LWP corresponding | |
1222 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1223 | ||
1224 | static struct lwp_info * | |
1225 | find_lwp_pid (ptid_t ptid) | |
1226 | { | |
1227 | struct lwp_info *lp; | |
1228 | int lwp; | |
1229 | ||
1230 | if (is_lwp (ptid)) | |
1231 | lwp = GET_LWP (ptid); | |
1232 | else | |
1233 | lwp = GET_PID (ptid); | |
1234 | ||
1235 | for (lp = lwp_list; lp; lp = lp->next) | |
1236 | if (lwp == GET_LWP (lp->ptid)) | |
1237 | return lp; | |
1238 | ||
1239 | return NULL; | |
1240 | } | |
1241 | ||
d90e17a7 PA |
1242 | /* Returns true if PTID matches filter FILTER. FILTER can be the wild |
1243 | card MINUS_ONE_PTID (all ptid match it); can be a ptid representing | |
1244 | a process (ptid_is_pid returns true), in which case, all lwps of | |
1245 | that give process match, lwps of other process do not; or, it can | |
1246 | represent a specific thread, in which case, only that thread will | |
1247 | match true. PTID must represent an LWP, it can never be a wild | |
1248 | card. */ | |
1249 | ||
1250 | static int | |
1251 | ptid_match (ptid_t ptid, ptid_t filter) | |
1252 | { | |
1253 | /* Since both parameters have the same type, prevent easy mistakes | |
1254 | from happening. */ | |
1255 | gdb_assert (!ptid_equal (ptid, minus_one_ptid) | |
1256 | && !ptid_equal (ptid, null_ptid)); | |
1257 | ||
1258 | if (ptid_equal (filter, minus_one_ptid)) | |
1259 | return 1; | |
1260 | if (ptid_is_pid (filter) | |
1261 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
1262 | return 1; | |
1263 | else if (ptid_equal (ptid, filter)) | |
1264 | return 1; | |
1265 | ||
1266 | return 0; | |
1267 | } | |
1268 | ||
d6b0e80f AC |
1269 | /* Call CALLBACK with its second argument set to DATA for every LWP in |
1270 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1271 | pointer to the structure describing that LWP immediately. | |
1272 | Otherwise return NULL. */ | |
1273 | ||
1274 | struct lwp_info * | |
d90e17a7 PA |
1275 | iterate_over_lwps (ptid_t filter, |
1276 | int (*callback) (struct lwp_info *, void *), | |
1277 | void *data) | |
d6b0e80f AC |
1278 | { |
1279 | struct lwp_info *lp, *lpnext; | |
1280 | ||
1281 | for (lp = lwp_list; lp; lp = lpnext) | |
1282 | { | |
1283 | lpnext = lp->next; | |
d90e17a7 PA |
1284 | |
1285 | if (ptid_match (lp->ptid, filter)) | |
1286 | { | |
1287 | if ((*callback) (lp, data)) | |
1288 | return lp; | |
1289 | } | |
d6b0e80f AC |
1290 | } |
1291 | ||
1292 | return NULL; | |
1293 | } | |
1294 | ||
2277426b PA |
1295 | /* Update our internal state when changing from one checkpoint to |
1296 | another indicated by NEW_PTID. We can only switch single-threaded | |
1297 | applications, so we only create one new LWP, and the previous list | |
1298 | is discarded. */ | |
f973ed9c DJ |
1299 | |
1300 | void | |
1301 | linux_nat_switch_fork (ptid_t new_ptid) | |
1302 | { | |
1303 | struct lwp_info *lp; | |
1304 | ||
2277426b PA |
1305 | purge_lwp_list (GET_PID (inferior_ptid)); |
1306 | ||
f973ed9c DJ |
1307 | lp = add_lwp (new_ptid); |
1308 | lp->stopped = 1; | |
e26af52f | 1309 | |
2277426b PA |
1310 | /* This changes the thread's ptid while preserving the gdb thread |
1311 | num. Also changes the inferior pid, while preserving the | |
1312 | inferior num. */ | |
1313 | thread_change_ptid (inferior_ptid, new_ptid); | |
1314 | ||
1315 | /* We've just told GDB core that the thread changed target id, but, | |
1316 | in fact, it really is a different thread, with different register | |
1317 | contents. */ | |
1318 | registers_changed (); | |
e26af52f DJ |
1319 | } |
1320 | ||
e26af52f DJ |
1321 | /* Handle the exit of a single thread LP. */ |
1322 | ||
1323 | static void | |
1324 | exit_lwp (struct lwp_info *lp) | |
1325 | { | |
e09875d4 | 1326 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1327 | |
1328 | if (th) | |
e26af52f | 1329 | { |
17faa917 DJ |
1330 | if (print_thread_events) |
1331 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1332 | ||
4f8d22e3 | 1333 | delete_thread (lp->ptid); |
e26af52f DJ |
1334 | } |
1335 | ||
1336 | delete_lwp (lp->ptid); | |
1337 | } | |
1338 | ||
4d062f1a PA |
1339 | /* Return an lwp's tgid, found in `/proc/PID/status'. */ |
1340 | ||
1341 | int | |
1342 | linux_proc_get_tgid (int lwpid) | |
1343 | { | |
1344 | FILE *status_file; | |
1345 | char buf[100]; | |
1346 | int tgid = -1; | |
1347 | ||
1348 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); | |
1349 | status_file = fopen (buf, "r"); | |
1350 | if (status_file != NULL) | |
1351 | { | |
1352 | while (fgets (buf, sizeof (buf), status_file)) | |
1353 | { | |
1354 | if (strncmp (buf, "Tgid:", 5) == 0) | |
1355 | { | |
1356 | tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10); | |
1357 | break; | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | fclose (status_file); | |
1362 | } | |
1363 | ||
1364 | return tgid; | |
1365 | } | |
1366 | ||
a0ef4274 DJ |
1367 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1368 | Other states including `T (tracing stop)' are reported as false. */ | |
1369 | ||
1370 | static int | |
1371 | pid_is_stopped (pid_t pid) | |
1372 | { | |
1373 | FILE *status_file; | |
1374 | char buf[100]; | |
1375 | int retval = 0; | |
1376 | ||
1377 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1378 | status_file = fopen (buf, "r"); | |
1379 | if (status_file != NULL) | |
1380 | { | |
1381 | int have_state = 0; | |
1382 | ||
1383 | while (fgets (buf, sizeof (buf), status_file)) | |
1384 | { | |
1385 | if (strncmp (buf, "State:", 6) == 0) | |
1386 | { | |
1387 | have_state = 1; | |
1388 | break; | |
1389 | } | |
1390 | } | |
1391 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1392 | retval = 1; | |
1393 | fclose (status_file); | |
1394 | } | |
1395 | return retval; | |
1396 | } | |
1397 | ||
1398 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1399 | Returns a wait status for that LWP, to cache. */ | |
1400 | ||
1401 | static int | |
1402 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1403 | int *signalled) | |
1404 | { | |
1405 | pid_t new_pid, pid = GET_LWP (ptid); | |
1406 | int status; | |
1407 | ||
1408 | if (pid_is_stopped (pid)) | |
1409 | { | |
1410 | if (debug_linux_nat) | |
1411 | fprintf_unfiltered (gdb_stdlog, | |
1412 | "LNPAW: Attaching to a stopped process\n"); | |
1413 | ||
1414 | /* The process is definitely stopped. It is in a job control | |
1415 | stop, unless the kernel predates the TASK_STOPPED / | |
1416 | TASK_TRACED distinction, in which case it might be in a | |
1417 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1418 | can kill it, signal it, et cetera. | |
1419 | ||
1420 | First make sure there is a pending SIGSTOP. Since we are | |
1421 | already attached, the process can not transition from stopped | |
1422 | to running without a PTRACE_CONT; so we know this signal will | |
1423 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1424 | probably already in the queue (unless this kernel is old | |
1425 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1426 | is not an RT signal, it can only be queued once. */ | |
1427 | kill_lwp (pid, SIGSTOP); | |
1428 | ||
1429 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1430 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1431 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1432 | } | |
1433 | ||
1434 | /* Make sure the initial process is stopped. The user-level threads | |
1435 | layer might want to poke around in the inferior, and that won't | |
1436 | work if things haven't stabilized yet. */ | |
1437 | new_pid = my_waitpid (pid, &status, 0); | |
1438 | if (new_pid == -1 && errno == ECHILD) | |
1439 | { | |
1440 | if (first) | |
1441 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1442 | ||
1443 | /* Try again with __WCLONE to check cloned processes. */ | |
1444 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1445 | *cloned = 1; | |
1446 | } | |
1447 | ||
dacc9cb2 PP |
1448 | gdb_assert (pid == new_pid); |
1449 | ||
1450 | if (!WIFSTOPPED (status)) | |
1451 | { | |
1452 | /* The pid we tried to attach has apparently just exited. */ | |
1453 | if (debug_linux_nat) | |
1454 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1455 | pid, status_to_str (status)); | |
1456 | return status; | |
1457 | } | |
a0ef4274 DJ |
1458 | |
1459 | if (WSTOPSIG (status) != SIGSTOP) | |
1460 | { | |
1461 | *signalled = 1; | |
1462 | if (debug_linux_nat) | |
1463 | fprintf_unfiltered (gdb_stdlog, | |
1464 | "LNPAW: Received %s after attaching\n", | |
1465 | status_to_str (status)); | |
1466 | } | |
1467 | ||
1468 | return status; | |
1469 | } | |
1470 | ||
1471 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1472 | if the new LWP could not be attached. */ | |
d6b0e80f | 1473 | |
9ee57c33 | 1474 | int |
93815fbf | 1475 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1476 | { |
9ee57c33 | 1477 | struct lwp_info *lp; |
7feb7d06 | 1478 | sigset_t prev_mask; |
d6b0e80f AC |
1479 | |
1480 | gdb_assert (is_lwp (ptid)); | |
1481 | ||
7feb7d06 | 1482 | block_child_signals (&prev_mask); |
d6b0e80f | 1483 | |
9ee57c33 | 1484 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1485 | |
1486 | /* We assume that we're already attached to any LWP that has an id | |
1487 | equal to the overall process id, and to any LWP that is already | |
1488 | in our list of LWPs. If we're not seeing exit events from threads | |
1489 | and we've had PID wraparound since we last tried to stop all threads, | |
1490 | this assumption might be wrong; fortunately, this is very unlikely | |
1491 | to happen. */ | |
9ee57c33 | 1492 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1493 | { |
a0ef4274 | 1494 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1495 | |
1496 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1497 | { |
1498 | /* If we fail to attach to the thread, issue a warning, | |
1499 | but continue. One way this can happen is if thread | |
e9efe249 | 1500 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1501 | bug may place threads in the thread list and then fail |
1502 | to create them. */ | |
1503 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1504 | safe_strerror (errno)); | |
7feb7d06 | 1505 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1506 | return -1; |
1507 | } | |
1508 | ||
d6b0e80f AC |
1509 | if (debug_linux_nat) |
1510 | fprintf_unfiltered (gdb_stdlog, | |
1511 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1512 | target_pid_to_str (ptid)); | |
1513 | ||
a0ef4274 | 1514 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
dacc9cb2 PP |
1515 | if (!WIFSTOPPED (status)) |
1516 | return -1; | |
1517 | ||
a0ef4274 DJ |
1518 | lp = add_lwp (ptid); |
1519 | lp->stopped = 1; | |
1520 | lp->cloned = cloned; | |
1521 | lp->signalled = signalled; | |
1522 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1523 | { |
a0ef4274 DJ |
1524 | lp->resumed = 1; |
1525 | lp->status = status; | |
d6b0e80f AC |
1526 | } |
1527 | ||
a0ef4274 | 1528 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1529 | |
1530 | if (debug_linux_nat) | |
1531 | { | |
1532 | fprintf_unfiltered (gdb_stdlog, | |
1533 | "LLAL: waitpid %s received %s\n", | |
1534 | target_pid_to_str (ptid), | |
1535 | status_to_str (status)); | |
1536 | } | |
1537 | } | |
1538 | else | |
1539 | { | |
1540 | /* We assume that the LWP representing the original process is | |
1541 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1542 | that the GNU/linux ptrace layer uses to keep track of |
1543 | threads. Note that this won't have already been done since | |
1544 | the main thread will have, we assume, been stopped by an | |
1545 | attach from a different layer. */ | |
9ee57c33 DJ |
1546 | if (lp == NULL) |
1547 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1548 | lp->stopped = 1; |
1549 | } | |
9ee57c33 | 1550 | |
7feb7d06 | 1551 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1552 | return 0; |
d6b0e80f AC |
1553 | } |
1554 | ||
b84876c2 | 1555 | static void |
136d6dae VP |
1556 | linux_nat_create_inferior (struct target_ops *ops, |
1557 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1558 | int from_tty) |
1559 | { | |
10568435 JK |
1560 | #ifdef HAVE_PERSONALITY |
1561 | int personality_orig = 0, personality_set = 0; | |
1562 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1563 | |
1564 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1565 | we have to mask the async mode. */ | |
1566 | ||
10568435 JK |
1567 | #ifdef HAVE_PERSONALITY |
1568 | if (disable_randomization) | |
1569 | { | |
1570 | errno = 0; | |
1571 | personality_orig = personality (0xffffffff); | |
1572 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1573 | { | |
1574 | personality_set = 1; | |
1575 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1576 | } | |
1577 | if (errno != 0 || (personality_set | |
1578 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1579 | warning (_("Error disabling address space randomization: %s"), | |
1580 | safe_strerror (errno)); | |
1581 | } | |
1582 | #endif /* HAVE_PERSONALITY */ | |
1583 | ||
136d6dae | 1584 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1585 | |
10568435 JK |
1586 | #ifdef HAVE_PERSONALITY |
1587 | if (personality_set) | |
1588 | { | |
1589 | errno = 0; | |
1590 | personality (personality_orig); | |
1591 | if (errno != 0) | |
1592 | warning (_("Error restoring address space randomization: %s"), | |
1593 | safe_strerror (errno)); | |
1594 | } | |
1595 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1596 | } |
1597 | ||
d6b0e80f | 1598 | static void |
136d6dae | 1599 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1600 | { |
1601 | struct lwp_info *lp; | |
d6b0e80f | 1602 | int status; |
af990527 | 1603 | ptid_t ptid; |
d6b0e80f | 1604 | |
136d6dae | 1605 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1606 | |
af990527 PA |
1607 | /* The ptrace base target adds the main thread with (pid,0,0) |
1608 | format. Decorate it with lwp info. */ | |
1609 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1610 | thread_change_ptid (inferior_ptid, ptid); | |
1611 | ||
9f0bdab8 | 1612 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1613 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1614 | |
1615 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1616 | &lp->signalled); | |
dacc9cb2 PP |
1617 | if (!WIFSTOPPED (status)) |
1618 | { | |
1619 | if (WIFEXITED (status)) | |
1620 | { | |
1621 | int exit_code = WEXITSTATUS (status); | |
1622 | ||
1623 | target_terminal_ours (); | |
1624 | target_mourn_inferior (); | |
1625 | if (exit_code == 0) | |
1626 | error (_("Unable to attach: program exited normally.")); | |
1627 | else | |
1628 | error (_("Unable to attach: program exited with code %d."), | |
1629 | exit_code); | |
1630 | } | |
1631 | else if (WIFSIGNALED (status)) | |
1632 | { | |
1633 | enum target_signal signo; | |
1634 | ||
1635 | target_terminal_ours (); | |
1636 | target_mourn_inferior (); | |
1637 | ||
1638 | signo = target_signal_from_host (WTERMSIG (status)); | |
1639 | error (_("Unable to attach: program terminated with signal " | |
1640 | "%s, %s."), | |
1641 | target_signal_to_name (signo), | |
1642 | target_signal_to_string (signo)); | |
1643 | } | |
1644 | ||
1645 | internal_error (__FILE__, __LINE__, | |
1646 | _("unexpected status %d for PID %ld"), | |
1647 | status, (long) GET_LWP (ptid)); | |
1648 | } | |
1649 | ||
a0ef4274 | 1650 | lp->stopped = 1; |
9f0bdab8 | 1651 | |
a0ef4274 | 1652 | /* Save the wait status to report later. */ |
d6b0e80f | 1653 | lp->resumed = 1; |
a0ef4274 DJ |
1654 | if (debug_linux_nat) |
1655 | fprintf_unfiltered (gdb_stdlog, | |
1656 | "LNA: waitpid %ld, saving status %s\n", | |
1657 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1658 | |
7feb7d06 PA |
1659 | lp->status = status; |
1660 | ||
1661 | if (target_can_async_p ()) | |
1662 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1663 | } |
1664 | ||
a0ef4274 DJ |
1665 | /* Get pending status of LP. */ |
1666 | static int | |
1667 | get_pending_status (struct lwp_info *lp, int *status) | |
1668 | { | |
ca2163eb PA |
1669 | enum target_signal signo = TARGET_SIGNAL_0; |
1670 | ||
1671 | /* If we paused threads momentarily, we may have stored pending | |
1672 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1673 | and GDB core hasn't seen any signal for those threads. | |
1674 | Otherwise, the last signal reported to the core is found in the | |
1675 | thread object's stop_signal. | |
1676 | ||
1677 | There's a corner case that isn't handled here at present. Only | |
1678 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1679 | stop_signal make sense as a real signal to pass to the inferior. | |
1680 | Some catchpoint related events, like | |
1681 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
1682 | to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But, | |
1683 | those traps are debug API (ptrace in our case) related and | |
1684 | induced; the inferior wouldn't see them if it wasn't being | |
1685 | traced. Hence, we should never pass them to the inferior, even | |
1686 | when set to pass state. Since this corner case isn't handled by | |
1687 | infrun.c when proceeding with a signal, for consistency, neither | |
1688 | do we handle it here (or elsewhere in the file we check for | |
1689 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1690 | this is really a corner case. */ | |
1691 | ||
1692 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
1693 | signo = TARGET_SIGNAL_0; /* a pending ptrace event, not a real signal. */ | |
1694 | else if (lp->status) | |
1695 | signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1696 | else if (non_stop && !is_executing (lp->ptid)) | |
1697 | { | |
1698 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
1699 | signo = tp->stop_signal; | |
1700 | } | |
1701 | else if (!non_stop) | |
a0ef4274 | 1702 | { |
ca2163eb PA |
1703 | struct target_waitstatus last; |
1704 | ptid_t last_ptid; | |
4c28f408 | 1705 | |
ca2163eb | 1706 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1707 | |
ca2163eb PA |
1708 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) |
1709 | { | |
e09875d4 | 1710 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
2020b7ab | 1711 | signo = tp->stop_signal; |
4c28f408 | 1712 | } |
ca2163eb | 1713 | } |
4c28f408 | 1714 | |
ca2163eb | 1715 | *status = 0; |
4c28f408 | 1716 | |
ca2163eb PA |
1717 | if (signo == TARGET_SIGNAL_0) |
1718 | { | |
1719 | if (debug_linux_nat) | |
1720 | fprintf_unfiltered (gdb_stdlog, | |
1721 | "GPT: lwp %s has no pending signal\n", | |
1722 | target_pid_to_str (lp->ptid)); | |
1723 | } | |
1724 | else if (!signal_pass_state (signo)) | |
1725 | { | |
1726 | if (debug_linux_nat) | |
1727 | fprintf_unfiltered (gdb_stdlog, "\ | |
1728 | GPT: lwp %s had signal %s, but it is in no pass state\n", | |
1729 | target_pid_to_str (lp->ptid), | |
1730 | target_signal_to_string (signo)); | |
a0ef4274 | 1731 | } |
a0ef4274 | 1732 | else |
4c28f408 | 1733 | { |
ca2163eb PA |
1734 | *status = W_STOPCODE (target_signal_to_host (signo)); |
1735 | ||
1736 | if (debug_linux_nat) | |
1737 | fprintf_unfiltered (gdb_stdlog, | |
1738 | "GPT: lwp %s has pending signal %s\n", | |
1739 | target_pid_to_str (lp->ptid), | |
1740 | target_signal_to_string (signo)); | |
4c28f408 | 1741 | } |
a0ef4274 DJ |
1742 | |
1743 | return 0; | |
1744 | } | |
1745 | ||
d6b0e80f AC |
1746 | static int |
1747 | detach_callback (struct lwp_info *lp, void *data) | |
1748 | { | |
1749 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1750 | ||
1751 | if (debug_linux_nat && lp->status) | |
1752 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1753 | strsignal (WSTOPSIG (lp->status)), | |
1754 | target_pid_to_str (lp->ptid)); | |
1755 | ||
a0ef4274 DJ |
1756 | /* If there is a pending SIGSTOP, get rid of it. */ |
1757 | if (lp->signalled) | |
d6b0e80f | 1758 | { |
d6b0e80f AC |
1759 | if (debug_linux_nat) |
1760 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1761 | "DC: Sending SIGCONT to %s\n", |
1762 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1763 | |
a0ef4274 | 1764 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1765 | lp->signalled = 0; |
d6b0e80f AC |
1766 | } |
1767 | ||
1768 | /* We don't actually detach from the LWP that has an id equal to the | |
1769 | overall process id just yet. */ | |
1770 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1771 | { | |
a0ef4274 DJ |
1772 | int status = 0; |
1773 | ||
1774 | /* Pass on any pending signal for this LWP. */ | |
1775 | get_pending_status (lp, &status); | |
1776 | ||
d6b0e80f AC |
1777 | errno = 0; |
1778 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1779 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1780 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1781 | safe_strerror (errno)); |
1782 | ||
1783 | if (debug_linux_nat) | |
1784 | fprintf_unfiltered (gdb_stdlog, | |
1785 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1786 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1787 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1788 | |
1789 | delete_lwp (lp->ptid); | |
1790 | } | |
1791 | ||
1792 | return 0; | |
1793 | } | |
1794 | ||
1795 | static void | |
136d6dae | 1796 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1797 | { |
b84876c2 | 1798 | int pid; |
a0ef4274 DJ |
1799 | int status; |
1800 | enum target_signal sig; | |
d90e17a7 PA |
1801 | struct lwp_info *main_lwp; |
1802 | ||
1803 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1804 | |
b84876c2 PA |
1805 | if (target_can_async_p ()) |
1806 | linux_nat_async (NULL, 0); | |
1807 | ||
4c28f408 PA |
1808 | /* Stop all threads before detaching. ptrace requires that the |
1809 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1810 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1811 | /* ... and wait until all of them have reported back that |
1812 | they're no longer running. */ | |
d90e17a7 | 1813 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1814 | |
d90e17a7 | 1815 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1816 | |
1817 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1818 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1819 | ||
1820 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1821 | |
a0ef4274 DJ |
1822 | /* Pass on any pending signal for the last LWP. */ |
1823 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1824 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1825 | && WIFSTOPPED (status)) |
1826 | { | |
1827 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1828 | pass it along with PTRACE_DETACH. */ | |
1829 | args = alloca (8); | |
1830 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
1831 | fprintf_unfiltered (gdb_stdlog, | |
1832 | "LND: Sending signal %s to %s\n", | |
1833 | args, | |
d90e17a7 | 1834 | target_pid_to_str (main_lwp->ptid)); |
a0ef4274 DJ |
1835 | } |
1836 | ||
d90e17a7 | 1837 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1838 | |
7a7d3353 PA |
1839 | if (forks_exist_p ()) |
1840 | { | |
1841 | /* Multi-fork case. The current inferior_ptid is being detached | |
1842 | from, but there are other viable forks to debug. Detach from | |
1843 | the current fork, and context-switch to the first | |
1844 | available. */ | |
1845 | linux_fork_detach (args, from_tty); | |
1846 | ||
1847 | if (non_stop && target_can_async_p ()) | |
1848 | target_async (inferior_event_handler, 0); | |
1849 | } | |
1850 | else | |
1851 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1852 | } |
1853 | ||
1854 | /* Resume LP. */ | |
1855 | ||
1856 | static int | |
1857 | resume_callback (struct lwp_info *lp, void *data) | |
1858 | { | |
6c95b8df PA |
1859 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
1860 | ||
1861 | if (lp->stopped && inf->vfork_child != NULL) | |
1862 | { | |
1863 | if (debug_linux_nat) | |
1864 | fprintf_unfiltered (gdb_stdlog, | |
1865 | "RC: Not resuming %s (vfork parent)\n", | |
1866 | target_pid_to_str (lp->ptid)); | |
1867 | } | |
1868 | else if (lp->stopped && lp->status == 0) | |
d6b0e80f | 1869 | { |
d90e17a7 PA |
1870 | if (debug_linux_nat) |
1871 | fprintf_unfiltered (gdb_stdlog, | |
1872 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", | |
1873 | target_pid_to_str (lp->ptid)); | |
1874 | ||
28439f5e PA |
1875 | linux_ops->to_resume (linux_ops, |
1876 | pid_to_ptid (GET_LWP (lp->ptid)), | |
10d6c8cd | 1877 | 0, TARGET_SIGNAL_0); |
d6b0e80f AC |
1878 | if (debug_linux_nat) |
1879 | fprintf_unfiltered (gdb_stdlog, | |
1880 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1881 | target_pid_to_str (lp->ptid)); | |
1882 | lp->stopped = 0; | |
1883 | lp->step = 0; | |
9f0bdab8 | 1884 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
d6b0e80f | 1885 | } |
57380f4e DJ |
1886 | else if (lp->stopped && debug_linux_nat) |
1887 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (has pending)\n", | |
1888 | target_pid_to_str (lp->ptid)); | |
1889 | else if (debug_linux_nat) | |
1890 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (not stopped)\n", | |
1891 | target_pid_to_str (lp->ptid)); | |
d6b0e80f AC |
1892 | |
1893 | return 0; | |
1894 | } | |
1895 | ||
1896 | static int | |
1897 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1898 | { | |
1899 | lp->resumed = 0; | |
1900 | return 0; | |
1901 | } | |
1902 | ||
1903 | static int | |
1904 | resume_set_callback (struct lwp_info *lp, void *data) | |
1905 | { | |
1906 | lp->resumed = 1; | |
1907 | return 0; | |
1908 | } | |
1909 | ||
1910 | static void | |
28439f5e PA |
1911 | linux_nat_resume (struct target_ops *ops, |
1912 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1913 | { |
7feb7d06 | 1914 | sigset_t prev_mask; |
d6b0e80f | 1915 | struct lwp_info *lp; |
d90e17a7 | 1916 | int resume_many; |
d6b0e80f | 1917 | |
76f50ad1 DJ |
1918 | if (debug_linux_nat) |
1919 | fprintf_unfiltered (gdb_stdlog, | |
1920 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1921 | step ? "step" : "resume", | |
1922 | target_pid_to_str (ptid), | |
1923 | signo ? strsignal (signo) : "0", | |
1924 | target_pid_to_str (inferior_ptid)); | |
1925 | ||
7feb7d06 | 1926 | block_child_signals (&prev_mask); |
b84876c2 | 1927 | |
d6b0e80f | 1928 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1929 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1930 | || ptid_is_pid (ptid)); | |
4c28f408 PA |
1931 | |
1932 | if (!non_stop) | |
1933 | { | |
d90e17a7 PA |
1934 | /* Mark the lwps we're resuming as resumed. */ |
1935 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
1936 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
4c28f408 | 1937 | } |
d90e17a7 PA |
1938 | else |
1939 | iterate_over_lwps (minus_one_ptid, resume_set_callback, NULL); | |
d6b0e80f | 1940 | |
d90e17a7 PA |
1941 | /* See if it's the current inferior that should be handled |
1942 | specially. */ | |
1943 | if (resume_many) | |
1944 | lp = find_lwp_pid (inferior_ptid); | |
1945 | else | |
1946 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1947 | gdb_assert (lp != NULL); |
d6b0e80f | 1948 | |
9f0bdab8 DJ |
1949 | /* Remember if we're stepping. */ |
1950 | lp->step = step; | |
d6b0e80f | 1951 | |
9f0bdab8 DJ |
1952 | /* If we have a pending wait status for this thread, there is no |
1953 | point in resuming the process. But first make sure that | |
1954 | linux_nat_wait won't preemptively handle the event - we | |
1955 | should never take this short-circuit if we are going to | |
1956 | leave LP running, since we have skipped resuming all the | |
1957 | other threads. This bit of code needs to be synchronized | |
1958 | with linux_nat_wait. */ | |
76f50ad1 | 1959 | |
9f0bdab8 DJ |
1960 | if (lp->status && WIFSTOPPED (lp->status)) |
1961 | { | |
d6b48e9c PA |
1962 | int saved_signo; |
1963 | struct inferior *inf; | |
76f50ad1 | 1964 | |
d90e17a7 | 1965 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); |
d6b48e9c PA |
1966 | gdb_assert (inf); |
1967 | saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1968 | ||
1969 | /* Defer to common code if we're gaining control of the | |
1970 | inferior. */ | |
1971 | if (inf->stop_soon == NO_STOP_QUIETLY | |
1972 | && signal_stop_state (saved_signo) == 0 | |
9f0bdab8 DJ |
1973 | && signal_print_state (saved_signo) == 0 |
1974 | && signal_pass_state (saved_signo) == 1) | |
d6b0e80f | 1975 | { |
9f0bdab8 DJ |
1976 | if (debug_linux_nat) |
1977 | fprintf_unfiltered (gdb_stdlog, | |
1978 | "LLR: Not short circuiting for ignored " | |
1979 | "status 0x%x\n", lp->status); | |
1980 | ||
d6b0e80f AC |
1981 | /* FIXME: What should we do if we are supposed to continue |
1982 | this thread with a signal? */ | |
1983 | gdb_assert (signo == TARGET_SIGNAL_0); | |
9f0bdab8 DJ |
1984 | signo = saved_signo; |
1985 | lp->status = 0; | |
1986 | } | |
1987 | } | |
76f50ad1 | 1988 | |
6c95b8df | 1989 | if (lp->status || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
9f0bdab8 DJ |
1990 | { |
1991 | /* FIXME: What should we do if we are supposed to continue | |
1992 | this thread with a signal? */ | |
1993 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1994 | |
9f0bdab8 DJ |
1995 | if (debug_linux_nat) |
1996 | fprintf_unfiltered (gdb_stdlog, | |
1997 | "LLR: Short circuiting for status 0x%x\n", | |
1998 | lp->status); | |
d6b0e80f | 1999 | |
7feb7d06 PA |
2000 | restore_child_signals_mask (&prev_mask); |
2001 | if (target_can_async_p ()) | |
2002 | { | |
2003 | target_async (inferior_event_handler, 0); | |
2004 | /* Tell the event loop we have something to process. */ | |
2005 | async_file_mark (); | |
2006 | } | |
9f0bdab8 | 2007 | return; |
d6b0e80f AC |
2008 | } |
2009 | ||
9f0bdab8 DJ |
2010 | /* Mark LWP as not stopped to prevent it from being continued by |
2011 | resume_callback. */ | |
2012 | lp->stopped = 0; | |
2013 | ||
d90e17a7 PA |
2014 | if (resume_many) |
2015 | iterate_over_lwps (ptid, resume_callback, NULL); | |
2016 | ||
2017 | /* Convert to something the lower layer understands. */ | |
2018 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 2019 | |
28439f5e | 2020 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 DJ |
2021 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
2022 | ||
d6b0e80f AC |
2023 | if (debug_linux_nat) |
2024 | fprintf_unfiltered (gdb_stdlog, | |
2025 | "LLR: %s %s, %s (resume event thread)\n", | |
2026 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2027 | target_pid_to_str (ptid), | |
2028 | signo ? strsignal (signo) : "0"); | |
b84876c2 | 2029 | |
7feb7d06 | 2030 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 2031 | if (target_can_async_p ()) |
8ea051c5 | 2032 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
2033 | } |
2034 | ||
2035 | /* Issue kill to specified lwp. */ | |
2036 | ||
2037 | static int tkill_failed; | |
2038 | ||
2039 | static int | |
2040 | kill_lwp (int lwpid, int signo) | |
2041 | { | |
2042 | errno = 0; | |
2043 | ||
2044 | /* Use tkill, if possible, in case we are using nptl threads. If tkill | |
2045 | fails, then we are not using nptl threads and we should be using kill. */ | |
2046 | ||
2047 | #ifdef HAVE_TKILL_SYSCALL | |
2048 | if (!tkill_failed) | |
2049 | { | |
2050 | int ret = syscall (__NR_tkill, lwpid, signo); | |
2051 | if (errno != ENOSYS) | |
2052 | return ret; | |
2053 | errno = 0; | |
2054 | tkill_failed = 1; | |
2055 | } | |
2056 | #endif | |
2057 | ||
2058 | return kill (lwpid, signo); | |
2059 | } | |
2060 | ||
ca2163eb PA |
2061 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
2062 | event, check if the core is interested in it: if not, ignore the | |
2063 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
2064 | syscall entry/exit status, since the ptrace event itself doesn't | |
2065 | indicate it, and report the trap to higher layers. */ | |
2066 | ||
2067 | static int | |
2068 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
2069 | { | |
2070 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2071 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
2072 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2073 | ||
2074 | if (stopping) | |
2075 | { | |
2076 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
2077 | makes it so that the LWP reports an immediate syscall return, | |
2078 | followed by the SIGSTOP. Skip seeing that "return" using | |
2079 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
2080 | SIGSTOP. Later when the thread is resumed, a new syscall | |
2081 | entry event. If we didn't do this (and returned 0), we'd | |
2082 | leave a syscall entry pending, and our caller, by using | |
2083 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
2084 | itself. Later, when the user re-resumes this LWP, we'd see | |
2085 | another syscall entry event and we'd mistake it for a return. | |
2086 | ||
2087 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
2088 | (leaving immediately with LWP->signalled set, without issuing | |
2089 | a PTRACE_CONT), it would still be problematic to leave this | |
2090 | syscall enter pending, as later when the thread is resumed, | |
2091 | it would then see the same syscall exit mentioned above, | |
2092 | followed by the delayed SIGSTOP, while the syscall didn't | |
2093 | actually get to execute. It seems it would be even more | |
2094 | confusing to the user. */ | |
2095 | ||
2096 | if (debug_linux_nat) | |
2097 | fprintf_unfiltered (gdb_stdlog, | |
2098 | "LHST: ignoring syscall %d " | |
2099 | "for LWP %ld (stopping threads), " | |
2100 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
2101 | syscall_number, | |
2102 | GET_LWP (lp->ptid)); | |
2103 | ||
2104 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2105 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2106 | return 1; | |
2107 | } | |
2108 | ||
2109 | if (catch_syscall_enabled ()) | |
2110 | { | |
2111 | /* Always update the entry/return state, even if this particular | |
2112 | syscall isn't interesting to the core now. In async mode, | |
2113 | the user could install a new catchpoint for this syscall | |
2114 | between syscall enter/return, and we'll need to know to | |
2115 | report a syscall return if that happens. */ | |
2116 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2117 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2118 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2119 | ||
2120 | if (catching_syscall_number (syscall_number)) | |
2121 | { | |
2122 | /* Alright, an event to report. */ | |
2123 | ourstatus->kind = lp->syscall_state; | |
2124 | ourstatus->value.syscall_number = syscall_number; | |
2125 | ||
2126 | if (debug_linux_nat) | |
2127 | fprintf_unfiltered (gdb_stdlog, | |
2128 | "LHST: stopping for %s of syscall %d" | |
2129 | " for LWP %ld\n", | |
2130 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2131 | ? "entry" : "return", | |
2132 | syscall_number, | |
2133 | GET_LWP (lp->ptid)); | |
2134 | return 0; | |
2135 | } | |
2136 | ||
2137 | if (debug_linux_nat) | |
2138 | fprintf_unfiltered (gdb_stdlog, | |
2139 | "LHST: ignoring %s of syscall %d " | |
2140 | "for LWP %ld\n", | |
2141 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2142 | ? "entry" : "return", | |
2143 | syscall_number, | |
2144 | GET_LWP (lp->ptid)); | |
2145 | } | |
2146 | else | |
2147 | { | |
2148 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
2149 | before on this LWP, it could happen that the user removes all | |
2150 | syscall catchpoints before we get to process this event. | |
2151 | There are two noteworthy issues here: | |
2152 | ||
2153 | - When stopped at a syscall entry event, resuming with | |
2154 | PT_STEP still resumes executing the syscall and reports a | |
2155 | syscall return. | |
2156 | ||
2157 | - Only PT_SYSCALL catches syscall enters. If we last | |
2158 | single-stepped this thread, then this event can't be a | |
2159 | syscall enter. If we last single-stepped this thread, this | |
2160 | has to be a syscall exit. | |
2161 | ||
2162 | The points above mean that the next resume, be it PT_STEP or | |
2163 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
2164 | if (debug_linux_nat) | |
2165 | fprintf_unfiltered (gdb_stdlog, | |
2166 | "LHST: caught syscall event with no syscall catchpoints." | |
2167 | " %d for LWP %ld, ignoring\n", | |
2168 | syscall_number, | |
2169 | GET_LWP (lp->ptid)); | |
2170 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2171 | } | |
2172 | ||
2173 | /* The core isn't interested in this event. For efficiency, avoid | |
2174 | stopping all threads only to have the core resume them all again. | |
2175 | Since we're not stopping threads, if we're still syscall tracing | |
2176 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
2177 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
2178 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
2179 | ||
2180 | /* Note that gdbarch_get_syscall_number may access registers, hence | |
2181 | fill a regcache. */ | |
2182 | registers_changed (); | |
2183 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
2184 | lp->step, TARGET_SIGNAL_0); | |
2185 | return 1; | |
2186 | } | |
2187 | ||
3d799a95 DJ |
2188 | /* Handle a GNU/Linux extended wait response. If we see a clone |
2189 | event, we need to add the new LWP to our list (and not report the | |
2190 | trap to higher layers). This function returns non-zero if the | |
2191 | event should be ignored and we should wait again. If STOPPING is | |
2192 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
2193 | |
2194 | static int | |
3d799a95 DJ |
2195 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
2196 | int stopping) | |
d6b0e80f | 2197 | { |
3d799a95 DJ |
2198 | int pid = GET_LWP (lp->ptid); |
2199 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2200 | struct lwp_info *new_lp = NULL; | |
2201 | int event = status >> 16; | |
d6b0e80f | 2202 | |
3d799a95 DJ |
2203 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
2204 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 2205 | { |
3d799a95 DJ |
2206 | unsigned long new_pid; |
2207 | int ret; | |
2208 | ||
2209 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 2210 | |
3d799a95 DJ |
2211 | /* If we haven't already seen the new PID stop, wait for it now. */ |
2212 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
2213 | { | |
2214 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
2215 | hits the SIGSTOP, but we're already attached. */ | |
2216 | ret = my_waitpid (new_pid, &status, | |
2217 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
2218 | if (ret == -1) | |
2219 | perror_with_name (_("waiting for new child")); | |
2220 | else if (ret != new_pid) | |
2221 | internal_error (__FILE__, __LINE__, | |
2222 | _("wait returned unexpected PID %d"), ret); | |
2223 | else if (!WIFSTOPPED (status)) | |
2224 | internal_error (__FILE__, __LINE__, | |
2225 | _("wait returned unexpected status 0x%x"), status); | |
2226 | } | |
2227 | ||
3a3e9ee3 | 2228 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2229 | |
2277426b PA |
2230 | if (event == PTRACE_EVENT_FORK |
2231 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
2232 | { | |
2233 | struct fork_info *fp; | |
2234 | ||
2235 | /* Handle checkpointing by linux-fork.c here as a special | |
2236 | case. We don't want the follow-fork-mode or 'catch fork' | |
2237 | to interfere with this. */ | |
2238 | ||
2239 | /* This won't actually modify the breakpoint list, but will | |
2240 | physically remove the breakpoints from the child. */ | |
2241 | detach_breakpoints (new_pid); | |
2242 | ||
2243 | /* Retain child fork in ptrace (stopped) state. */ | |
2244 | fp = find_fork_pid (new_pid); | |
2245 | if (!fp) | |
2246 | fp = add_fork (new_pid); | |
2247 | ||
2248 | /* Report as spurious, so that infrun doesn't want to follow | |
2249 | this fork. We're actually doing an infcall in | |
2250 | linux-fork.c. */ | |
2251 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2252 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
2253 | ||
2254 | /* Report the stop to the core. */ | |
2255 | return 0; | |
2256 | } | |
2257 | ||
3d799a95 DJ |
2258 | if (event == PTRACE_EVENT_FORK) |
2259 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2260 | else if (event == PTRACE_EVENT_VFORK) | |
2261 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 2262 | else |
3d799a95 | 2263 | { |
4c28f408 PA |
2264 | struct cleanup *old_chain; |
2265 | ||
3d799a95 | 2266 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
d90e17a7 | 2267 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 2268 | new_lp->cloned = 1; |
4c28f408 | 2269 | new_lp->stopped = 1; |
d6b0e80f | 2270 | |
3d799a95 DJ |
2271 | if (WSTOPSIG (status) != SIGSTOP) |
2272 | { | |
2273 | /* This can happen if someone starts sending signals to | |
2274 | the new thread before it gets a chance to run, which | |
2275 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2276 | This is an unlikely case, and harder to handle for | |
2277 | fork / vfork than for clone, so we do not try - but | |
2278 | we handle it for clone events here. We'll send | |
2279 | the other signal on to the thread below. */ | |
2280 | ||
2281 | new_lp->signalled = 1; | |
2282 | } | |
2283 | else | |
2284 | status = 0; | |
d6b0e80f | 2285 | |
4c28f408 | 2286 | if (non_stop) |
3d799a95 | 2287 | { |
4c28f408 PA |
2288 | /* Add the new thread to GDB's lists as soon as possible |
2289 | so that: | |
2290 | ||
2291 | 1) the frontend doesn't have to wait for a stop to | |
2292 | display them, and, | |
2293 | ||
2294 | 2) we tag it with the correct running state. */ | |
2295 | ||
2296 | /* If the thread_db layer is active, let it know about | |
2297 | this new thread, and add it to GDB's list. */ | |
2298 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2299 | { | |
2300 | /* We're not using thread_db. Add it to GDB's | |
2301 | list. */ | |
2302 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2303 | add_thread (new_lp->ptid); | |
2304 | } | |
2305 | ||
2306 | if (!stopping) | |
2307 | { | |
2308 | set_running (new_lp->ptid, 1); | |
2309 | set_executing (new_lp->ptid, 1); | |
2310 | } | |
2311 | } | |
2312 | ||
ca2163eb PA |
2313 | /* Note the need to use the low target ops to resume, to |
2314 | handle resuming with PT_SYSCALL if we have syscall | |
2315 | catchpoints. */ | |
4c28f408 PA |
2316 | if (!stopping) |
2317 | { | |
ca2163eb PA |
2318 | int signo; |
2319 | ||
4c28f408 | 2320 | new_lp->stopped = 0; |
3d799a95 | 2321 | new_lp->resumed = 1; |
ca2163eb PA |
2322 | |
2323 | signo = (status | |
2324 | ? target_signal_from_host (WSTOPSIG (status)) | |
2325 | : TARGET_SIGNAL_0); | |
2326 | ||
2327 | linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid), | |
2328 | 0, signo); | |
3d799a95 | 2329 | } |
d6b0e80f | 2330 | |
3d799a95 DJ |
2331 | if (debug_linux_nat) |
2332 | fprintf_unfiltered (gdb_stdlog, | |
2333 | "LHEW: Got clone event from LWP %ld, resuming\n", | |
2334 | GET_LWP (lp->ptid)); | |
ca2163eb PA |
2335 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
2336 | 0, TARGET_SIGNAL_0); | |
3d799a95 DJ |
2337 | |
2338 | return 1; | |
2339 | } | |
2340 | ||
2341 | return 0; | |
d6b0e80f AC |
2342 | } |
2343 | ||
3d799a95 DJ |
2344 | if (event == PTRACE_EVENT_EXEC) |
2345 | { | |
a75724bc PA |
2346 | if (debug_linux_nat) |
2347 | fprintf_unfiltered (gdb_stdlog, | |
2348 | "LHEW: Got exec event from LWP %ld\n", | |
2349 | GET_LWP (lp->ptid)); | |
2350 | ||
3d799a95 DJ |
2351 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2352 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2353 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 | 2354 | |
6c95b8df PA |
2355 | return 0; |
2356 | } | |
2357 | ||
2358 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2359 | { | |
2360 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2361 | { |
6c95b8df PA |
2362 | if (debug_linux_nat) |
2363 | fprintf_unfiltered (gdb_stdlog, "\ | |
2364 | LHEW: Got expected PTRACE_EVENT_VFORK_DONE from LWP %ld: stopping\n", | |
2365 | GET_LWP (lp->ptid)); | |
3d799a95 | 2366 | |
6c95b8df PA |
2367 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2368 | return 0; | |
3d799a95 DJ |
2369 | } |
2370 | ||
6c95b8df PA |
2371 | if (debug_linux_nat) |
2372 | fprintf_unfiltered (gdb_stdlog, "\ | |
2373 | LHEW: Got PTRACE_EVENT_VFORK_DONE from LWP %ld: resuming\n", | |
2374 | GET_LWP (lp->ptid)); | |
2375 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2376 | return 1; | |
3d799a95 DJ |
2377 | } |
2378 | ||
2379 | internal_error (__FILE__, __LINE__, | |
2380 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2381 | } |
2382 | ||
2383 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
2384 | exited. */ | |
2385 | ||
2386 | static int | |
2387 | wait_lwp (struct lwp_info *lp) | |
2388 | { | |
2389 | pid_t pid; | |
2390 | int status; | |
2391 | int thread_dead = 0; | |
2392 | ||
2393 | gdb_assert (!lp->stopped); | |
2394 | gdb_assert (lp->status == 0); | |
2395 | ||
58aecb61 | 2396 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
2397 | if (pid == -1 && errno == ECHILD) |
2398 | { | |
58aecb61 | 2399 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
2400 | if (pid == -1 && errno == ECHILD) |
2401 | { | |
2402 | /* The thread has previously exited. We need to delete it | |
2403 | now because, for some vendor 2.4 kernels with NPTL | |
2404 | support backported, there won't be an exit event unless | |
2405 | it is the main thread. 2.6 kernels will report an exit | |
2406 | event for each thread that exits, as expected. */ | |
2407 | thread_dead = 1; | |
2408 | if (debug_linux_nat) | |
2409 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2410 | target_pid_to_str (lp->ptid)); | |
2411 | } | |
2412 | } | |
2413 | ||
2414 | if (!thread_dead) | |
2415 | { | |
2416 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2417 | ||
2418 | if (debug_linux_nat) | |
2419 | { | |
2420 | fprintf_unfiltered (gdb_stdlog, | |
2421 | "WL: waitpid %s received %s\n", | |
2422 | target_pid_to_str (lp->ptid), | |
2423 | status_to_str (status)); | |
2424 | } | |
2425 | } | |
2426 | ||
2427 | /* Check if the thread has exited. */ | |
2428 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2429 | { | |
2430 | thread_dead = 1; | |
2431 | if (debug_linux_nat) | |
2432 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2433 | target_pid_to_str (lp->ptid)); | |
2434 | } | |
2435 | ||
2436 | if (thread_dead) | |
2437 | { | |
e26af52f | 2438 | exit_lwp (lp); |
d6b0e80f AC |
2439 | return 0; |
2440 | } | |
2441 | ||
2442 | gdb_assert (WIFSTOPPED (status)); | |
2443 | ||
ca2163eb PA |
2444 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2445 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2446 | { | |
2447 | /* No longer need the sysgood bit. The ptrace event ends up | |
2448 | recorded in lp->waitstatus if we care for it. We can carry | |
2449 | on handling the event like a regular SIGTRAP from here | |
2450 | on. */ | |
2451 | status = W_STOPCODE (SIGTRAP); | |
2452 | if (linux_handle_syscall_trap (lp, 1)) | |
2453 | return wait_lwp (lp); | |
2454 | } | |
2455 | ||
d6b0e80f AC |
2456 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
2457 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2458 | { | |
2459 | if (debug_linux_nat) | |
2460 | fprintf_unfiltered (gdb_stdlog, | |
2461 | "WL: Handling extended status 0x%06x\n", | |
2462 | status); | |
3d799a95 | 2463 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2464 | return wait_lwp (lp); |
2465 | } | |
2466 | ||
2467 | return status; | |
2468 | } | |
2469 | ||
9f0bdab8 DJ |
2470 | /* Save the most recent siginfo for LP. This is currently only called |
2471 | for SIGTRAP; some ports use the si_addr field for | |
2472 | target_stopped_data_address. In the future, it may also be used to | |
2473 | restore the siginfo of requeued signals. */ | |
2474 | ||
2475 | static void | |
2476 | save_siginfo (struct lwp_info *lp) | |
2477 | { | |
2478 | errno = 0; | |
2479 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2480 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2481 | ||
2482 | if (errno != 0) | |
2483 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2484 | } | |
2485 | ||
d6b0e80f AC |
2486 | /* Send a SIGSTOP to LP. */ |
2487 | ||
2488 | static int | |
2489 | stop_callback (struct lwp_info *lp, void *data) | |
2490 | { | |
2491 | if (!lp->stopped && !lp->signalled) | |
2492 | { | |
2493 | int ret; | |
2494 | ||
2495 | if (debug_linux_nat) | |
2496 | { | |
2497 | fprintf_unfiltered (gdb_stdlog, | |
2498 | "SC: kill %s **<SIGSTOP>**\n", | |
2499 | target_pid_to_str (lp->ptid)); | |
2500 | } | |
2501 | errno = 0; | |
2502 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2503 | if (debug_linux_nat) | |
2504 | { | |
2505 | fprintf_unfiltered (gdb_stdlog, | |
2506 | "SC: lwp kill %d %s\n", | |
2507 | ret, | |
2508 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2509 | } | |
2510 | ||
2511 | lp->signalled = 1; | |
2512 | gdb_assert (lp->status == 0); | |
2513 | } | |
2514 | ||
2515 | return 0; | |
2516 | } | |
2517 | ||
57380f4e | 2518 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2519 | |
2520 | static int | |
57380f4e DJ |
2521 | linux_nat_has_pending_sigint (int pid) |
2522 | { | |
2523 | sigset_t pending, blocked, ignored; | |
2524 | int i; | |
2525 | ||
2526 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2527 | ||
2528 | if (sigismember (&pending, SIGINT) | |
2529 | && !sigismember (&ignored, SIGINT)) | |
2530 | return 1; | |
2531 | ||
2532 | return 0; | |
2533 | } | |
2534 | ||
2535 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2536 | ||
2537 | static int | |
2538 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2539 | { |
57380f4e DJ |
2540 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2541 | flag to consume the next one. */ | |
2542 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2543 | && WSTOPSIG (lp->status) == SIGINT) | |
2544 | lp->status = 0; | |
2545 | else | |
2546 | lp->ignore_sigint = 1; | |
2547 | ||
2548 | return 0; | |
2549 | } | |
2550 | ||
2551 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2552 | This function is called after we know the LWP has stopped; if the LWP | |
2553 | stopped before the expected SIGINT was delivered, then it will never have | |
2554 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2555 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2556 | |
57380f4e DJ |
2557 | static void |
2558 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2559 | { | |
2560 | if (!lp->ignore_sigint) | |
2561 | return; | |
2562 | ||
2563 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2564 | { | |
2565 | if (debug_linux_nat) | |
2566 | fprintf_unfiltered (gdb_stdlog, | |
2567 | "MCIS: Clearing bogus flag for %s\n", | |
2568 | target_pid_to_str (lp->ptid)); | |
2569 | lp->ignore_sigint = 0; | |
2570 | } | |
2571 | } | |
2572 | ||
2573 | /* Wait until LP is stopped. */ | |
2574 | ||
2575 | static int | |
2576 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2577 | { | |
6c95b8df PA |
2578 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
2579 | ||
2580 | /* If this is a vfork parent, bail out, it is not going to report | |
2581 | any SIGSTOP until the vfork is done with. */ | |
2582 | if (inf->vfork_child != NULL) | |
2583 | return 0; | |
2584 | ||
d6b0e80f AC |
2585 | if (!lp->stopped) |
2586 | { | |
2587 | int status; | |
2588 | ||
2589 | status = wait_lwp (lp); | |
2590 | if (status == 0) | |
2591 | return 0; | |
2592 | ||
57380f4e DJ |
2593 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2594 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2595 | { |
57380f4e | 2596 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2597 | |
2598 | errno = 0; | |
2599 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2600 | if (debug_linux_nat) | |
2601 | fprintf_unfiltered (gdb_stdlog, | |
57380f4e | 2602 | "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n", |
d6b0e80f AC |
2603 | target_pid_to_str (lp->ptid), |
2604 | errno ? safe_strerror (errno) : "OK"); | |
2605 | ||
57380f4e | 2606 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2607 | } |
2608 | ||
57380f4e DJ |
2609 | maybe_clear_ignore_sigint (lp); |
2610 | ||
d6b0e80f AC |
2611 | if (WSTOPSIG (status) != SIGSTOP) |
2612 | { | |
2613 | if (WSTOPSIG (status) == SIGTRAP) | |
2614 | { | |
2615 | /* If a LWP other than the LWP that we're reporting an | |
2616 | event for has hit a GDB breakpoint (as opposed to | |
2617 | some random trap signal), then just arrange for it to | |
2618 | hit it again later. We don't keep the SIGTRAP status | |
2619 | and don't forward the SIGTRAP signal to the LWP. We | |
2620 | will handle the current event, eventually we will | |
2621 | resume all LWPs, and this one will get its breakpoint | |
2622 | trap again. | |
2623 | ||
2624 | If we do not do this, then we run the risk that the | |
2625 | user will delete or disable the breakpoint, but the | |
2626 | thread will have already tripped on it. */ | |
2627 | ||
9f0bdab8 DJ |
2628 | /* Save the trap's siginfo in case we need it later. */ |
2629 | save_siginfo (lp); | |
2630 | ||
d6b0e80f AC |
2631 | /* Now resume this LWP and get the SIGSTOP event. */ |
2632 | errno = 0; | |
2633 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2634 | if (debug_linux_nat) | |
2635 | { | |
2636 | fprintf_unfiltered (gdb_stdlog, | |
2637 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2638 | target_pid_to_str (lp->ptid), | |
2639 | errno ? safe_strerror (errno) : "OK"); | |
2640 | ||
2641 | fprintf_unfiltered (gdb_stdlog, | |
2642 | "SWC: Candidate SIGTRAP event in %s\n", | |
2643 | target_pid_to_str (lp->ptid)); | |
2644 | } | |
710151dd PA |
2645 | /* Hold this event/waitstatus while we check to see if |
2646 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2647 | stop_wait_callback (lp, NULL); |
710151dd | 2648 | |
7feb7d06 PA |
2649 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2650 | there's another event, throw it back into the | |
2651 | queue. */ | |
2652 | if (lp->status) | |
710151dd | 2653 | { |
7feb7d06 PA |
2654 | if (debug_linux_nat) |
2655 | fprintf_unfiltered (gdb_stdlog, | |
2656 | "SWC: kill %s, %s\n", | |
2657 | target_pid_to_str (lp->ptid), | |
2658 | status_to_str ((int) status)); | |
2659 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2660 | } |
7feb7d06 PA |
2661 | |
2662 | /* Save the sigtrap event. */ | |
2663 | lp->status = status; | |
d6b0e80f AC |
2664 | return 0; |
2665 | } | |
2666 | else | |
2667 | { | |
2668 | /* The thread was stopped with a signal other than | |
2669 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
2670 | ||
2671 | if (debug_linux_nat) | |
2672 | { | |
2673 | fprintf_unfiltered (gdb_stdlog, | |
2674 | "SWC: Pending event %s in %s\n", | |
2675 | status_to_str ((int) status), | |
2676 | target_pid_to_str (lp->ptid)); | |
2677 | } | |
2678 | /* Now resume this LWP and get the SIGSTOP event. */ | |
2679 | errno = 0; | |
2680 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2681 | if (debug_linux_nat) | |
2682 | fprintf_unfiltered (gdb_stdlog, | |
2683 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2684 | target_pid_to_str (lp->ptid), | |
2685 | errno ? safe_strerror (errno) : "OK"); | |
2686 | ||
2687 | /* Hold this event/waitstatus while we check to see if | |
2688 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2689 | stop_wait_callback (lp, NULL); |
710151dd PA |
2690 | |
2691 | /* If the lp->status field is still empty, use it to | |
2692 | hold this event. If not, then this event must be | |
2693 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2694 | if (lp->status) |
d6b0e80f AC |
2695 | { |
2696 | if (debug_linux_nat) | |
2697 | { | |
2698 | fprintf_unfiltered (gdb_stdlog, | |
2699 | "SWC: kill %s, %s\n", | |
2700 | target_pid_to_str (lp->ptid), | |
2701 | status_to_str ((int) status)); | |
2702 | } | |
2703 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2704 | } | |
710151dd PA |
2705 | else |
2706 | lp->status = status; | |
d6b0e80f AC |
2707 | return 0; |
2708 | } | |
2709 | } | |
2710 | else | |
2711 | { | |
2712 | /* We caught the SIGSTOP that we intended to catch, so | |
2713 | there's no SIGSTOP pending. */ | |
2714 | lp->stopped = 1; | |
2715 | lp->signalled = 0; | |
2716 | } | |
2717 | } | |
2718 | ||
2719 | return 0; | |
2720 | } | |
2721 | ||
d6b0e80f AC |
2722 | /* Return non-zero if LP has a wait status pending. */ |
2723 | ||
2724 | static int | |
2725 | status_callback (struct lwp_info *lp, void *data) | |
2726 | { | |
2727 | /* Only report a pending wait status if we pretend that this has | |
2728 | indeed been resumed. */ | |
ca2163eb PA |
2729 | if (!lp->resumed) |
2730 | return 0; | |
2731 | ||
2732 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2733 | { | |
2734 | /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event, | |
2735 | or a a pending process exit. Note that `W_EXITCODE(0,0) == | |
2736 | 0', so a clean process exit can not be stored pending in | |
2737 | lp->status, it is indistinguishable from | |
2738 | no-pending-status. */ | |
2739 | return 1; | |
2740 | } | |
2741 | ||
2742 | if (lp->status != 0) | |
2743 | return 1; | |
2744 | ||
2745 | return 0; | |
d6b0e80f AC |
2746 | } |
2747 | ||
2748 | /* Return non-zero if LP isn't stopped. */ | |
2749 | ||
2750 | static int | |
2751 | running_callback (struct lwp_info *lp, void *data) | |
2752 | { | |
2753 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2754 | } | |
2755 | ||
2756 | /* Count the LWP's that have had events. */ | |
2757 | ||
2758 | static int | |
2759 | count_events_callback (struct lwp_info *lp, void *data) | |
2760 | { | |
2761 | int *count = data; | |
2762 | ||
2763 | gdb_assert (count != NULL); | |
2764 | ||
e09490f1 DJ |
2765 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
2766 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2767 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2768 | (*count)++; | |
2769 | ||
2770 | return 0; | |
2771 | } | |
2772 | ||
2773 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2774 | ||
2775 | static int | |
2776 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2777 | { | |
2778 | if (lp->step && lp->status != 0) | |
2779 | return 1; | |
2780 | else | |
2781 | return 0; | |
2782 | } | |
2783 | ||
2784 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2785 | ||
2786 | static int | |
2787 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2788 | { | |
2789 | int *selector = data; | |
2790 | ||
2791 | gdb_assert (selector != NULL); | |
2792 | ||
e09490f1 DJ |
2793 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
2794 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2795 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2796 | if ((*selector)-- == 0) | |
2797 | return 1; | |
2798 | ||
2799 | return 0; | |
2800 | } | |
2801 | ||
710151dd PA |
2802 | static int |
2803 | cancel_breakpoint (struct lwp_info *lp) | |
2804 | { | |
2805 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2806 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2807 | LWP. We will handle the current event, eventually we will resume | |
2808 | this LWP, and this breakpoint will trap again. | |
2809 | ||
2810 | If we do not do this, then we run the risk that the user will | |
2811 | delete or disable the breakpoint, but the LWP will have already | |
2812 | tripped on it. */ | |
2813 | ||
515630c5 UW |
2814 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2815 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2816 | CORE_ADDR pc; | |
2817 | ||
2818 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
6c95b8df | 2819 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
710151dd PA |
2820 | { |
2821 | if (debug_linux_nat) | |
2822 | fprintf_unfiltered (gdb_stdlog, | |
2823 | "CB: Push back breakpoint for %s\n", | |
2824 | target_pid_to_str (lp->ptid)); | |
2825 | ||
2826 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2827 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2828 | regcache_write_pc (regcache, pc); | |
2829 | ||
710151dd PA |
2830 | return 1; |
2831 | } | |
2832 | return 0; | |
2833 | } | |
2834 | ||
d6b0e80f AC |
2835 | static int |
2836 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2837 | { | |
2838 | struct lwp_info *event_lp = data; | |
2839 | ||
2840 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2841 | if (lp == event_lp) | |
2842 | return 0; | |
2843 | ||
2844 | /* If a LWP other than the LWP that we're reporting an event for has | |
2845 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2846 | then just arrange for it to hit it again later. We don't keep | |
2847 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2848 | LWP. We will handle the current event, eventually we will resume | |
2849 | all LWPs, and this one will get its breakpoint trap again. | |
2850 | ||
2851 | If we do not do this, then we run the risk that the user will | |
2852 | delete or disable the breakpoint, but the LWP will have already | |
2853 | tripped on it. */ | |
2854 | ||
ca2163eb PA |
2855 | if (lp->waitstatus.kind == TARGET_WAITKIND_IGNORE |
2856 | && lp->status != 0 | |
d6b0e80f | 2857 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP |
710151dd PA |
2858 | && cancel_breakpoint (lp)) |
2859 | /* Throw away the SIGTRAP. */ | |
2860 | lp->status = 0; | |
d6b0e80f AC |
2861 | |
2862 | return 0; | |
2863 | } | |
2864 | ||
2865 | /* Select one LWP out of those that have events pending. */ | |
2866 | ||
2867 | static void | |
d90e17a7 | 2868 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
2869 | { |
2870 | int num_events = 0; | |
2871 | int random_selector; | |
2872 | struct lwp_info *event_lp; | |
2873 | ||
ac264b3b | 2874 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2875 | (*orig_lp)->status = *status; |
2876 | ||
2877 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
2878 | event_lp = iterate_over_lwps (filter, |
2879 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
2880 | if (event_lp != NULL) |
2881 | { | |
2882 | if (debug_linux_nat) | |
2883 | fprintf_unfiltered (gdb_stdlog, | |
2884 | "SEL: Select single-step %s\n", | |
2885 | target_pid_to_str (event_lp->ptid)); | |
2886 | } | |
2887 | else | |
2888 | { | |
2889 | /* No single-stepping LWP. Select one at random, out of those | |
2890 | which have had SIGTRAP events. */ | |
2891 | ||
2892 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 2893 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
2894 | |
2895 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2896 | random_selector = (int) | |
2897 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2898 | ||
2899 | if (debug_linux_nat && num_events > 1) | |
2900 | fprintf_unfiltered (gdb_stdlog, | |
2901 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2902 | num_events, random_selector); | |
2903 | ||
d90e17a7 PA |
2904 | event_lp = iterate_over_lwps (filter, |
2905 | select_event_lwp_callback, | |
d6b0e80f AC |
2906 | &random_selector); |
2907 | } | |
2908 | ||
2909 | if (event_lp != NULL) | |
2910 | { | |
2911 | /* Switch the event LWP. */ | |
2912 | *orig_lp = event_lp; | |
2913 | *status = event_lp->status; | |
2914 | } | |
2915 | ||
2916 | /* Flush the wait status for the event LWP. */ | |
2917 | (*orig_lp)->status = 0; | |
2918 | } | |
2919 | ||
2920 | /* Return non-zero if LP has been resumed. */ | |
2921 | ||
2922 | static int | |
2923 | resumed_callback (struct lwp_info *lp, void *data) | |
2924 | { | |
2925 | return lp->resumed; | |
2926 | } | |
2927 | ||
d6b0e80f AC |
2928 | /* Stop an active thread, verify it still exists, then resume it. */ |
2929 | ||
2930 | static int | |
2931 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
2932 | { | |
2933 | struct lwp_info *ptr; | |
2934 | ||
2935 | if (!lp->stopped && !lp->signalled) | |
2936 | { | |
2937 | stop_callback (lp, NULL); | |
2938 | stop_wait_callback (lp, NULL); | |
2939 | /* Resume if the lwp still exists. */ | |
2940 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
2941 | if (lp == ptr) | |
2942 | { | |
2943 | resume_callback (lp, NULL); | |
2944 | resume_set_callback (lp, NULL); | |
2945 | } | |
2946 | } | |
2947 | return 0; | |
2948 | } | |
2949 | ||
02f3fc28 | 2950 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 2951 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
2952 | static struct lwp_info * |
2953 | linux_nat_filter_event (int lwpid, int status, int options) | |
2954 | { | |
2955 | struct lwp_info *lp; | |
2956 | ||
2957 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2958 | ||
2959 | /* Check for stop events reported by a process we didn't already | |
2960 | know about - anything not already in our LWP list. | |
2961 | ||
2962 | If we're expecting to receive stopped processes after | |
2963 | fork, vfork, and clone events, then we'll just add the | |
2964 | new one to our list and go back to waiting for the event | |
2965 | to be reported - the stopped process might be returned | |
2966 | from waitpid before or after the event is. */ | |
2967 | if (WIFSTOPPED (status) && !lp) | |
2968 | { | |
2969 | linux_record_stopped_pid (lwpid, status); | |
2970 | return NULL; | |
2971 | } | |
2972 | ||
2973 | /* Make sure we don't report an event for the exit of an LWP not in | |
2974 | our list, i.e. not part of the current process. This can happen | |
2975 | if we detach from a program we original forked and then it | |
2976 | exits. */ | |
2977 | if (!WIFSTOPPED (status) && !lp) | |
2978 | return NULL; | |
2979 | ||
2980 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
2981 | CLONE_PTRACE processes which do not use the thread library - | |
2982 | otherwise we wouldn't find the new LWP this way. That doesn't | |
2983 | currently work, and the following code is currently unreachable | |
2984 | due to the two blocks above. If it's fixed some day, this code | |
2985 | should be broken out into a function so that we can also pick up | |
2986 | LWPs from the new interface. */ | |
2987 | if (!lp) | |
2988 | { | |
2989 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
2990 | if (options & __WCLONE) | |
2991 | lp->cloned = 1; | |
2992 | ||
2993 | gdb_assert (WIFSTOPPED (status) | |
2994 | && WSTOPSIG (status) == SIGSTOP); | |
2995 | lp->signalled = 1; | |
2996 | ||
2997 | if (!in_thread_list (inferior_ptid)) | |
2998 | { | |
2999 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
3000 | GET_PID (inferior_ptid)); | |
3001 | add_thread (inferior_ptid); | |
3002 | } | |
3003 | ||
3004 | add_thread (lp->ptid); | |
3005 | } | |
3006 | ||
ca2163eb PA |
3007 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3008 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3009 | { | |
3010 | /* No longer need the sysgood bit. The ptrace event ends up | |
3011 | recorded in lp->waitstatus if we care for it. We can carry | |
3012 | on handling the event like a regular SIGTRAP from here | |
3013 | on. */ | |
3014 | status = W_STOPCODE (SIGTRAP); | |
3015 | if (linux_handle_syscall_trap (lp, 0)) | |
3016 | return NULL; | |
3017 | } | |
02f3fc28 | 3018 | |
ca2163eb PA |
3019 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
3020 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
02f3fc28 PA |
3021 | { |
3022 | if (debug_linux_nat) | |
3023 | fprintf_unfiltered (gdb_stdlog, | |
3024 | "LLW: Handling extended status 0x%06x\n", | |
3025 | status); | |
3026 | if (linux_handle_extended_wait (lp, status, 0)) | |
3027 | return NULL; | |
3028 | } | |
3029 | ||
ca2163eb PA |
3030 | /* Save the trap's siginfo in case we need it later. */ |
3031 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) | |
3032 | save_siginfo (lp); | |
3033 | ||
02f3fc28 | 3034 | /* Check if the thread has exited. */ |
d90e17a7 PA |
3035 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
3036 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 3037 | { |
9db03742 JB |
3038 | /* If this is the main thread, we must stop all threads and verify |
3039 | if they are still alive. This is because in the nptl thread model | |
3040 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
3041 | other than the main thread. We only get the main thread exit |
3042 | signal once all child threads have already exited. If we | |
3043 | stop all the threads and use the stop_wait_callback to check | |
3044 | if they have exited we can determine whether this signal | |
3045 | should be ignored or whether it means the end of the debugged | |
3046 | application, regardless of which threading model is being | |
5d3b6af6 | 3047 | used. */ |
02f3fc28 PA |
3048 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
3049 | { | |
3050 | lp->stopped = 1; | |
d90e17a7 PA |
3051 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
3052 | stop_and_resume_callback, NULL); | |
02f3fc28 PA |
3053 | } |
3054 | ||
3055 | if (debug_linux_nat) | |
3056 | fprintf_unfiltered (gdb_stdlog, | |
3057 | "LLW: %s exited.\n", | |
3058 | target_pid_to_str (lp->ptid)); | |
3059 | ||
d90e17a7 | 3060 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
3061 | { |
3062 | /* If there is at least one more LWP, then the exit signal | |
3063 | was not the end of the debugged application and should be | |
3064 | ignored. */ | |
3065 | exit_lwp (lp); | |
3066 | return NULL; | |
3067 | } | |
02f3fc28 PA |
3068 | } |
3069 | ||
3070 | /* Check if the current LWP has previously exited. In the nptl | |
3071 | thread model, LWPs other than the main thread do not issue | |
3072 | signals when they exit so we must check whenever the thread has | |
3073 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 3074 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 3075 | { |
d90e17a7 PA |
3076 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
3077 | ||
02f3fc28 PA |
3078 | if (debug_linux_nat) |
3079 | fprintf_unfiltered (gdb_stdlog, | |
3080 | "LLW: %s exited.\n", | |
3081 | target_pid_to_str (lp->ptid)); | |
3082 | ||
3083 | exit_lwp (lp); | |
3084 | ||
3085 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 3086 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
3087 | |
3088 | /* Discard the event. */ | |
3089 | return NULL; | |
3090 | } | |
3091 | ||
3092 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
3093 | an attempt to stop an LWP. */ | |
3094 | if (lp->signalled | |
3095 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3096 | { | |
3097 | if (debug_linux_nat) | |
3098 | fprintf_unfiltered (gdb_stdlog, | |
3099 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
3100 | target_pid_to_str (lp->ptid)); | |
3101 | ||
3102 | /* This is a delayed SIGSTOP. */ | |
3103 | lp->signalled = 0; | |
3104 | ||
3105 | registers_changed (); | |
3106 | ||
28439f5e | 3107 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
02f3fc28 PA |
3108 | lp->step, TARGET_SIGNAL_0); |
3109 | if (debug_linux_nat) | |
3110 | fprintf_unfiltered (gdb_stdlog, | |
3111 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
3112 | lp->step ? | |
3113 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3114 | target_pid_to_str (lp->ptid)); | |
3115 | ||
3116 | lp->stopped = 0; | |
3117 | gdb_assert (lp->resumed); | |
3118 | ||
3119 | /* Discard the event. */ | |
3120 | return NULL; | |
3121 | } | |
3122 | ||
57380f4e DJ |
3123 | /* Make sure we don't report a SIGINT that we have already displayed |
3124 | for another thread. */ | |
3125 | if (lp->ignore_sigint | |
3126 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3127 | { | |
3128 | if (debug_linux_nat) | |
3129 | fprintf_unfiltered (gdb_stdlog, | |
3130 | "LLW: Delayed SIGINT caught for %s.\n", | |
3131 | target_pid_to_str (lp->ptid)); | |
3132 | ||
3133 | /* This is a delayed SIGINT. */ | |
3134 | lp->ignore_sigint = 0; | |
3135 | ||
3136 | registers_changed (); | |
28439f5e | 3137 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
3138 | lp->step, TARGET_SIGNAL_0); |
3139 | if (debug_linux_nat) | |
3140 | fprintf_unfiltered (gdb_stdlog, | |
3141 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3142 | lp->step ? | |
3143 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3144 | target_pid_to_str (lp->ptid)); | |
3145 | ||
3146 | lp->stopped = 0; | |
3147 | gdb_assert (lp->resumed); | |
3148 | ||
3149 | /* Discard the event. */ | |
3150 | return NULL; | |
3151 | } | |
3152 | ||
02f3fc28 PA |
3153 | /* An interesting event. */ |
3154 | gdb_assert (lp); | |
ca2163eb | 3155 | lp->status = status; |
02f3fc28 PA |
3156 | return lp; |
3157 | } | |
3158 | ||
d6b0e80f | 3159 | static ptid_t |
7feb7d06 | 3160 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3161 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3162 | int target_options) | |
d6b0e80f | 3163 | { |
7feb7d06 | 3164 | static sigset_t prev_mask; |
d6b0e80f AC |
3165 | struct lwp_info *lp = NULL; |
3166 | int options = 0; | |
3167 | int status = 0; | |
d90e17a7 | 3168 | pid_t pid; |
d6b0e80f | 3169 | |
b84876c2 PA |
3170 | if (debug_linux_nat_async) |
3171 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); | |
3172 | ||
f973ed9c DJ |
3173 | /* The first time we get here after starting a new inferior, we may |
3174 | not have added it to the LWP list yet - this is the earliest | |
3175 | moment at which we know its PID. */ | |
d90e17a7 | 3176 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3177 | { |
27c9d204 PA |
3178 | /* Upgrade the main thread's ptid. */ |
3179 | thread_change_ptid (inferior_ptid, | |
3180 | BUILD_LWP (GET_PID (inferior_ptid), | |
3181 | GET_PID (inferior_ptid))); | |
3182 | ||
f973ed9c DJ |
3183 | lp = add_lwp (inferior_ptid); |
3184 | lp->resumed = 1; | |
3185 | } | |
3186 | ||
7feb7d06 PA |
3187 | /* Make sure SIGCHLD is blocked. */ |
3188 | block_child_signals (&prev_mask); | |
d6b0e80f | 3189 | |
d90e17a7 PA |
3190 | if (ptid_equal (ptid, minus_one_ptid)) |
3191 | pid = -1; | |
3192 | else if (ptid_is_pid (ptid)) | |
3193 | /* A request to wait for a specific tgid. This is not possible | |
3194 | with waitpid, so instead, we wait for any child, and leave | |
3195 | children we're not interested in right now with a pending | |
3196 | status to report later. */ | |
3197 | pid = -1; | |
3198 | else | |
3199 | pid = GET_LWP (ptid); | |
3200 | ||
d6b0e80f | 3201 | retry: |
d90e17a7 PA |
3202 | lp = NULL; |
3203 | status = 0; | |
d6b0e80f | 3204 | |
f973ed9c | 3205 | /* Make sure there is at least one LWP that has been resumed. */ |
d90e17a7 | 3206 | gdb_assert (iterate_over_lwps (ptid, resumed_callback, NULL)); |
d6b0e80f AC |
3207 | |
3208 | /* First check if there is a LWP with a wait status pending. */ | |
3209 | if (pid == -1) | |
3210 | { | |
3211 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 3212 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
3213 | if (lp) |
3214 | { | |
ca2163eb | 3215 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3216 | fprintf_unfiltered (gdb_stdlog, |
3217 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3218 | status_to_str (lp->status), |
d6b0e80f AC |
3219 | target_pid_to_str (lp->ptid)); |
3220 | } | |
3221 | ||
b84876c2 | 3222 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
3223 | cloned and uncloned processes. We start with the cloned |
3224 | processes. */ | |
d6b0e80f AC |
3225 | options = __WCLONE | WNOHANG; |
3226 | } | |
3227 | else if (is_lwp (ptid)) | |
3228 | { | |
3229 | if (debug_linux_nat) | |
3230 | fprintf_unfiltered (gdb_stdlog, | |
3231 | "LLW: Waiting for specific LWP %s.\n", | |
3232 | target_pid_to_str (ptid)); | |
3233 | ||
3234 | /* We have a specific LWP to check. */ | |
3235 | lp = find_lwp_pid (ptid); | |
3236 | gdb_assert (lp); | |
d6b0e80f | 3237 | |
ca2163eb | 3238 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3239 | fprintf_unfiltered (gdb_stdlog, |
3240 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3241 | status_to_str (lp->status), |
d6b0e80f AC |
3242 | target_pid_to_str (lp->ptid)); |
3243 | ||
3244 | /* If we have to wait, take into account whether PID is a cloned | |
3245 | process or not. And we have to convert it to something that | |
3246 | the layer beneath us can understand. */ | |
3247 | options = lp->cloned ? __WCLONE : 0; | |
3248 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
3249 | |
3250 | /* We check for lp->waitstatus in addition to lp->status, | |
3251 | because we can have pending process exits recorded in | |
3252 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
3253 | an additional lp->status_p flag. */ | |
ca2163eb | 3254 | if (lp->status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) |
d90e17a7 | 3255 | lp = NULL; |
d6b0e80f AC |
3256 | } |
3257 | ||
d90e17a7 | 3258 | if (lp && lp->signalled) |
d6b0e80f AC |
3259 | { |
3260 | /* A pending SIGSTOP may interfere with the normal stream of | |
3261 | events. In a typical case where interference is a problem, | |
3262 | we have a SIGSTOP signal pending for LWP A while | |
3263 | single-stepping it, encounter an event in LWP B, and take the | |
3264 | pending SIGSTOP while trying to stop LWP A. After processing | |
3265 | the event in LWP B, LWP A is continued, and we'll never see | |
3266 | the SIGTRAP associated with the last time we were | |
3267 | single-stepping LWP A. */ | |
3268 | ||
3269 | /* Resume the thread. It should halt immediately returning the | |
3270 | pending SIGSTOP. */ | |
3271 | registers_changed (); | |
28439f5e | 3272 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3273 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
3274 | if (debug_linux_nat) |
3275 | fprintf_unfiltered (gdb_stdlog, | |
3276 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
3277 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3278 | target_pid_to_str (lp->ptid)); | |
3279 | lp->stopped = 0; | |
3280 | gdb_assert (lp->resumed); | |
3281 | ||
ca2163eb PA |
3282 | /* Catch the pending SIGSTOP. */ |
3283 | status = lp->status; | |
3284 | lp->status = 0; | |
3285 | ||
d6b0e80f | 3286 | stop_wait_callback (lp, NULL); |
ca2163eb PA |
3287 | |
3288 | /* If the lp->status field isn't empty, we caught another signal | |
3289 | while flushing the SIGSTOP. Return it back to the event | |
3290 | queue of the LWP, as we already have an event to handle. */ | |
3291 | if (lp->status) | |
3292 | { | |
3293 | if (debug_linux_nat) | |
3294 | fprintf_unfiltered (gdb_stdlog, | |
3295 | "LLW: kill %s, %s\n", | |
3296 | target_pid_to_str (lp->ptid), | |
3297 | status_to_str (lp->status)); | |
3298 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
3299 | } | |
3300 | ||
3301 | lp->status = status; | |
d6b0e80f AC |
3302 | } |
3303 | ||
b84876c2 PA |
3304 | if (!target_can_async_p ()) |
3305 | { | |
3306 | /* Causes SIGINT to be passed on to the attached process. */ | |
3307 | set_sigint_trap (); | |
b84876c2 | 3308 | } |
d6b0e80f | 3309 | |
47608cb1 PA |
3310 | /* Translate generic target_wait options into waitpid options. */ |
3311 | if (target_options & TARGET_WNOHANG) | |
3312 | options |= WNOHANG; | |
7feb7d06 | 3313 | |
d90e17a7 | 3314 | while (lp == NULL) |
d6b0e80f AC |
3315 | { |
3316 | pid_t lwpid; | |
3317 | ||
7feb7d06 | 3318 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 3319 | |
d6b0e80f AC |
3320 | if (lwpid > 0) |
3321 | { | |
3322 | gdb_assert (pid == -1 || lwpid == pid); | |
3323 | ||
3324 | if (debug_linux_nat) | |
3325 | { | |
3326 | fprintf_unfiltered (gdb_stdlog, | |
3327 | "LLW: waitpid %ld received %s\n", | |
3328 | (long) lwpid, status_to_str (status)); | |
3329 | } | |
3330 | ||
02f3fc28 | 3331 | lp = linux_nat_filter_event (lwpid, status, options); |
d90e17a7 PA |
3332 | |
3333 | if (lp | |
3334 | && ptid_is_pid (ptid) | |
3335 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 3336 | { |
d90e17a7 PA |
3337 | if (debug_linux_nat) |
3338 | fprintf (stderr, "LWP %ld got an event %06x, leaving pending.\n", | |
3339 | ptid_get_lwp (lp->ptid), status); | |
3340 | ||
ca2163eb | 3341 | if (WIFSTOPPED (lp->status)) |
d90e17a7 | 3342 | { |
ca2163eb | 3343 | if (WSTOPSIG (lp->status) != SIGSTOP) |
d90e17a7 | 3344 | { |
d90e17a7 PA |
3345 | stop_callback (lp, NULL); |
3346 | ||
3347 | /* Resume in order to collect the sigstop. */ | |
3348 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
3349 | ||
3350 | stop_wait_callback (lp, NULL); | |
3351 | } | |
3352 | else | |
3353 | { | |
3354 | lp->stopped = 1; | |
3355 | lp->signalled = 0; | |
3356 | } | |
3357 | } | |
3358 | else if (WIFEXITED (status) || WIFSIGNALED (status)) | |
3359 | { | |
3360 | if (debug_linux_nat) | |
3361 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
3362 | ptid_get_lwp (lp->ptid)); | |
3363 | ||
3364 | /* This was the last lwp in the process. Since | |
3365 | events are serialized to GDB core, and we can't | |
3366 | report this one right now, but GDB core and the | |
3367 | other target layers will want to be notified | |
3368 | about the exit code/signal, leave the status | |
3369 | pending for the next time we're able to report | |
3370 | it. */ | |
d90e17a7 PA |
3371 | |
3372 | /* Prevent trying to stop this thread again. We'll | |
3373 | never try to resume it because it has a pending | |
3374 | status. */ | |
3375 | lp->stopped = 1; | |
3376 | ||
3377 | /* Dead LWP's aren't expected to reported a pending | |
3378 | sigstop. */ | |
3379 | lp->signalled = 0; | |
3380 | ||
3381 | /* Store the pending event in the waitstatus as | |
3382 | well, because W_EXITCODE(0,0) == 0. */ | |
ca2163eb | 3383 | store_waitstatus (&lp->waitstatus, lp->status); |
d90e17a7 PA |
3384 | } |
3385 | ||
3386 | /* Keep looking. */ | |
3387 | lp = NULL; | |
d6b0e80f AC |
3388 | continue; |
3389 | } | |
3390 | ||
d90e17a7 PA |
3391 | if (lp) |
3392 | break; | |
3393 | else | |
3394 | { | |
3395 | if (pid == -1) | |
3396 | { | |
3397 | /* waitpid did return something. Restart over. */ | |
3398 | options |= __WCLONE; | |
3399 | } | |
3400 | continue; | |
3401 | } | |
d6b0e80f AC |
3402 | } |
3403 | ||
3404 | if (pid == -1) | |
3405 | { | |
3406 | /* Alternate between checking cloned and uncloned processes. */ | |
3407 | options ^= __WCLONE; | |
3408 | ||
b84876c2 PA |
3409 | /* And every time we have checked both: |
3410 | In async mode, return to event loop; | |
3411 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 3412 | if (options & __WCLONE) |
b84876c2 | 3413 | { |
47608cb1 | 3414 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
3415 | { |
3416 | /* No interesting event. */ | |
3417 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3418 | ||
b84876c2 PA |
3419 | if (debug_linux_nat_async) |
3420 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3421 | ||
7feb7d06 | 3422 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
3423 | return minus_one_ptid; |
3424 | } | |
3425 | ||
3426 | sigsuspend (&suspend_mask); | |
3427 | } | |
d6b0e80f | 3428 | } |
28736962 PA |
3429 | else if (target_options & TARGET_WNOHANG) |
3430 | { | |
3431 | /* No interesting event for PID yet. */ | |
3432 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3433 | ||
3434 | if (debug_linux_nat_async) | |
3435 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3436 | ||
3437 | restore_child_signals_mask (&prev_mask); | |
3438 | return minus_one_ptid; | |
3439 | } | |
d6b0e80f AC |
3440 | |
3441 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3442 | gdb_assert (lp == NULL); |
d6b0e80f AC |
3443 | } |
3444 | ||
b84876c2 | 3445 | if (!target_can_async_p ()) |
d26b5354 | 3446 | clear_sigint_trap (); |
d6b0e80f AC |
3447 | |
3448 | gdb_assert (lp); | |
3449 | ||
ca2163eb PA |
3450 | status = lp->status; |
3451 | lp->status = 0; | |
3452 | ||
d6b0e80f AC |
3453 | /* Don't report signals that GDB isn't interested in, such as |
3454 | signals that are neither printed nor stopped upon. Stopping all | |
3455 | threads can be a bit time-consuming so if we want decent | |
3456 | performance with heavily multi-threaded programs, especially when | |
3457 | they're using a high frequency timer, we'd better avoid it if we | |
3458 | can. */ | |
3459 | ||
3460 | if (WIFSTOPPED (status)) | |
3461 | { | |
3462 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
d6b48e9c PA |
3463 | struct inferior *inf; |
3464 | ||
3465 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
3466 | gdb_assert (inf); | |
d6b0e80f | 3467 | |
d6b48e9c PA |
3468 | /* Defer to common code if we get a signal while |
3469 | single-stepping, since that may need special care, e.g. to | |
3470 | skip the signal handler, or, if we're gaining control of the | |
3471 | inferior. */ | |
d539ed7e | 3472 | if (!lp->step |
d6b48e9c | 3473 | && inf->stop_soon == NO_STOP_QUIETLY |
d539ed7e | 3474 | && signal_stop_state (signo) == 0 |
d6b0e80f AC |
3475 | && signal_print_state (signo) == 0 |
3476 | && signal_pass_state (signo) == 1) | |
3477 | { | |
3478 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3479 | here? It is not clear we should. GDB may not expect | |
3480 | other threads to run. On the other hand, not resuming | |
3481 | newly attached threads may cause an unwanted delay in | |
3482 | getting them running. */ | |
3483 | registers_changed (); | |
28439f5e | 3484 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3485 | lp->step, signo); |
d6b0e80f AC |
3486 | if (debug_linux_nat) |
3487 | fprintf_unfiltered (gdb_stdlog, | |
3488 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3489 | lp->step ? | |
3490 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3491 | target_pid_to_str (lp->ptid), | |
3492 | signo ? strsignal (signo) : "0"); | |
3493 | lp->stopped = 0; | |
d6b0e80f AC |
3494 | goto retry; |
3495 | } | |
3496 | ||
1ad15515 | 3497 | if (!non_stop) |
d6b0e80f | 3498 | { |
1ad15515 PA |
3499 | /* Only do the below in all-stop, as we currently use SIGINT |
3500 | to implement target_stop (see linux_nat_stop) in | |
3501 | non-stop. */ | |
3502 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3503 | { | |
3504 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3505 | forwarded to the entire process group, that is, all LWPs | |
3506 | will receive it - unless they're using CLONE_THREAD to | |
3507 | share signals. Since we only want to report it once, we | |
3508 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3509 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3510 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3511 | lp->ignore_sigint = 0; |
3512 | } | |
3513 | else | |
3514 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3515 | } |
3516 | } | |
3517 | ||
3518 | /* This LWP is stopped now. */ | |
3519 | lp->stopped = 1; | |
3520 | ||
3521 | if (debug_linux_nat) | |
3522 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3523 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3524 | ||
4c28f408 PA |
3525 | if (!non_stop) |
3526 | { | |
3527 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3528 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3529 | |
3530 | /* ... and wait until all of them have reported back that | |
3531 | they're no longer running. */ | |
d90e17a7 | 3532 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3533 | |
3534 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3535 | from among those that have had events. Giving equal priority | |
3536 | to all LWPs that have had events helps prevent | |
3537 | starvation. */ | |
3538 | if (pid == -1) | |
d90e17a7 | 3539 | select_event_lwp (ptid, &lp, &status); |
4c28f408 | 3540 | } |
d6b0e80f AC |
3541 | |
3542 | /* Now that we've selected our final event LWP, cancel any | |
3543 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
3544 | the comment in cancel_breakpoints_callback to find out why. */ | |
d90e17a7 | 3545 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); |
d6b0e80f | 3546 | |
d6b0e80f AC |
3547 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) |
3548 | { | |
d6b0e80f AC |
3549 | if (debug_linux_nat) |
3550 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3551 | "LLW: trap ptid is %s.\n", |
3552 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3553 | } |
d6b0e80f AC |
3554 | |
3555 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3556 | { | |
3557 | *ourstatus = lp->waitstatus; | |
3558 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3559 | } | |
3560 | else | |
3561 | store_waitstatus (ourstatus, status); | |
3562 | ||
b84876c2 PA |
3563 | if (debug_linux_nat_async) |
3564 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); | |
3565 | ||
7feb7d06 | 3566 | restore_child_signals_mask (&prev_mask); |
f973ed9c | 3567 | return lp->ptid; |
d6b0e80f AC |
3568 | } |
3569 | ||
7feb7d06 PA |
3570 | static ptid_t |
3571 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3572 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3573 | int target_options) | |
7feb7d06 PA |
3574 | { |
3575 | ptid_t event_ptid; | |
3576 | ||
3577 | if (debug_linux_nat) | |
3578 | fprintf_unfiltered (gdb_stdlog, "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
3579 | ||
3580 | /* Flush the async file first. */ | |
3581 | if (target_can_async_p ()) | |
3582 | async_file_flush (); | |
3583 | ||
47608cb1 | 3584 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3585 | |
3586 | /* If we requested any event, and something came out, assume there | |
3587 | may be more. If we requested a specific lwp or process, also | |
3588 | assume there may be more. */ | |
3589 | if (target_can_async_p () | |
3590 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3591 | || !ptid_equal (ptid, minus_one_ptid))) | |
3592 | async_file_mark (); | |
3593 | ||
3594 | /* Get ready for the next event. */ | |
3595 | if (target_can_async_p ()) | |
3596 | target_async (inferior_event_handler, 0); | |
3597 | ||
3598 | return event_ptid; | |
3599 | } | |
3600 | ||
d6b0e80f AC |
3601 | static int |
3602 | kill_callback (struct lwp_info *lp, void *data) | |
3603 | { | |
3604 | errno = 0; | |
3605 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3606 | if (debug_linux_nat) | |
3607 | fprintf_unfiltered (gdb_stdlog, | |
3608 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3609 | target_pid_to_str (lp->ptid), | |
3610 | errno ? safe_strerror (errno) : "OK"); | |
3611 | ||
3612 | return 0; | |
3613 | } | |
3614 | ||
3615 | static int | |
3616 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3617 | { | |
3618 | pid_t pid; | |
3619 | ||
3620 | /* We must make sure that there are no pending events (delayed | |
3621 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3622 | program doesn't interfere with any following debugging session. */ | |
3623 | ||
3624 | /* For cloned processes we must check both with __WCLONE and | |
3625 | without, since the exit status of a cloned process isn't reported | |
3626 | with __WCLONE. */ | |
3627 | if (lp->cloned) | |
3628 | { | |
3629 | do | |
3630 | { | |
58aecb61 | 3631 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3632 | if (pid != (pid_t) -1) |
d6b0e80f | 3633 | { |
e85a822c DJ |
3634 | if (debug_linux_nat) |
3635 | fprintf_unfiltered (gdb_stdlog, | |
3636 | "KWC: wait %s received unknown.\n", | |
3637 | target_pid_to_str (lp->ptid)); | |
3638 | /* The Linux kernel sometimes fails to kill a thread | |
3639 | completely after PTRACE_KILL; that goes from the stop | |
3640 | point in do_fork out to the one in | |
3641 | get_signal_to_deliever and waits again. So kill it | |
3642 | again. */ | |
3643 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3644 | } |
3645 | } | |
3646 | while (pid == GET_LWP (lp->ptid)); | |
3647 | ||
3648 | gdb_assert (pid == -1 && errno == ECHILD); | |
3649 | } | |
3650 | ||
3651 | do | |
3652 | { | |
58aecb61 | 3653 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3654 | if (pid != (pid_t) -1) |
d6b0e80f | 3655 | { |
e85a822c DJ |
3656 | if (debug_linux_nat) |
3657 | fprintf_unfiltered (gdb_stdlog, | |
3658 | "KWC: wait %s received unk.\n", | |
3659 | target_pid_to_str (lp->ptid)); | |
3660 | /* See the call to kill_callback above. */ | |
3661 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3662 | } |
3663 | } | |
3664 | while (pid == GET_LWP (lp->ptid)); | |
3665 | ||
3666 | gdb_assert (pid == -1 && errno == ECHILD); | |
3667 | return 0; | |
3668 | } | |
3669 | ||
3670 | static void | |
7d85a9c0 | 3671 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3672 | { |
f973ed9c DJ |
3673 | struct target_waitstatus last; |
3674 | ptid_t last_ptid; | |
3675 | int status; | |
d6b0e80f | 3676 | |
f973ed9c DJ |
3677 | /* If we're stopped while forking and we haven't followed yet, |
3678 | kill the other task. We need to do this first because the | |
3679 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3680 | |
f973ed9c | 3681 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3682 | |
f973ed9c DJ |
3683 | if (last.kind == TARGET_WAITKIND_FORKED |
3684 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3685 | { | |
3a3e9ee3 | 3686 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3687 | wait (&status); |
3688 | } | |
3689 | ||
3690 | if (forks_exist_p ()) | |
7feb7d06 | 3691 | linux_fork_killall (); |
f973ed9c DJ |
3692 | else |
3693 | { | |
d90e17a7 | 3694 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
4c28f408 PA |
3695 | /* Stop all threads before killing them, since ptrace requires |
3696 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3697 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3698 | /* ... and wait until all of them have reported back that |
3699 | they're no longer running. */ | |
d90e17a7 | 3700 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3701 | |
f973ed9c | 3702 | /* Kill all LWP's ... */ |
d90e17a7 | 3703 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3704 | |
3705 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3706 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3707 | } |
3708 | ||
3709 | target_mourn_inferior (); | |
d6b0e80f AC |
3710 | } |
3711 | ||
3712 | static void | |
136d6dae | 3713 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3714 | { |
d90e17a7 | 3715 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 3716 | |
f973ed9c | 3717 | if (! forks_exist_p ()) |
d90e17a7 PA |
3718 | /* Normal case, no other forks available. */ |
3719 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3720 | else |
3721 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3722 | there are other viable forks to debug. Delete the exiting | |
3723 | one and context-switch to the first available. */ | |
3724 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3725 | } |
3726 | ||
5b009018 PA |
3727 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3728 | layout of the inferiors' architecture. */ | |
3729 | ||
3730 | static void | |
3731 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
3732 | { | |
3733 | int done = 0; | |
3734 | ||
3735 | if (linux_nat_siginfo_fixup != NULL) | |
3736 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3737 | ||
3738 | /* If there was no callback, or the callback didn't do anything, | |
3739 | then just do a straight memcpy. */ | |
3740 | if (!done) | |
3741 | { | |
3742 | if (direction == 1) | |
3743 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3744 | else | |
3745 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3746 | } | |
3747 | } | |
3748 | ||
4aa995e1 PA |
3749 | static LONGEST |
3750 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
3751 | const char *annex, gdb_byte *readbuf, | |
3752 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3753 | { | |
4aa995e1 PA |
3754 | int pid; |
3755 | struct siginfo siginfo; | |
5b009018 | 3756 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3757 | |
3758 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3759 | gdb_assert (readbuf || writebuf); | |
3760 | ||
3761 | pid = GET_LWP (inferior_ptid); | |
3762 | if (pid == 0) | |
3763 | pid = GET_PID (inferior_ptid); | |
3764 | ||
3765 | if (offset > sizeof (siginfo)) | |
3766 | return -1; | |
3767 | ||
3768 | errno = 0; | |
3769 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3770 | if (errno != 0) | |
3771 | return -1; | |
3772 | ||
5b009018 PA |
3773 | /* When GDB is built as a 64-bit application, ptrace writes into |
3774 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3775 | inferior with a 64-bit GDB should look the same as debugging it | |
3776 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3777 | the converted layout, so any read/write will have to be done | |
3778 | post-conversion. */ | |
3779 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3780 | ||
4aa995e1 PA |
3781 | if (offset + len > sizeof (siginfo)) |
3782 | len = sizeof (siginfo) - offset; | |
3783 | ||
3784 | if (readbuf != NULL) | |
5b009018 | 3785 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3786 | else |
3787 | { | |
5b009018 PA |
3788 | memcpy (inf_siginfo + offset, writebuf, len); |
3789 | ||
3790 | /* Convert back to ptrace layout before flushing it out. */ | |
3791 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3792 | ||
4aa995e1 PA |
3793 | errno = 0; |
3794 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3795 | if (errno != 0) | |
3796 | return -1; | |
3797 | } | |
3798 | ||
3799 | return len; | |
3800 | } | |
3801 | ||
10d6c8cd DJ |
3802 | static LONGEST |
3803 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
3804 | const char *annex, gdb_byte *readbuf, | |
3805 | const gdb_byte *writebuf, | |
3806 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 3807 | { |
4aa995e1 | 3808 | struct cleanup *old_chain; |
10d6c8cd | 3809 | LONGEST xfer; |
d6b0e80f | 3810 | |
4aa995e1 PA |
3811 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3812 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
3813 | offset, len); | |
3814 | ||
c35b1492 PA |
3815 | /* The target is connected but no live inferior is selected. Pass |
3816 | this request down to a lower stratum (e.g., the executable | |
3817 | file). */ | |
3818 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
3819 | return 0; | |
3820 | ||
4aa995e1 PA |
3821 | old_chain = save_inferior_ptid (); |
3822 | ||
d6b0e80f AC |
3823 | if (is_lwp (inferior_ptid)) |
3824 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
3825 | ||
10d6c8cd DJ |
3826 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
3827 | offset, len); | |
d6b0e80f AC |
3828 | |
3829 | do_cleanups (old_chain); | |
3830 | return xfer; | |
3831 | } | |
3832 | ||
3833 | static int | |
28439f5e | 3834 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 3835 | { |
4c28f408 PA |
3836 | int err; |
3837 | ||
d6b0e80f AC |
3838 | gdb_assert (is_lwp (ptid)); |
3839 | ||
4c28f408 PA |
3840 | /* Send signal 0 instead of anything ptrace, because ptracing a |
3841 | running thread errors out claiming that the thread doesn't | |
3842 | exist. */ | |
3843 | err = kill_lwp (GET_LWP (ptid), 0); | |
3844 | ||
d6b0e80f AC |
3845 | if (debug_linux_nat) |
3846 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 3847 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 3848 | target_pid_to_str (ptid), |
4c28f408 | 3849 | err ? safe_strerror (err) : "OK"); |
9c0dd46b | 3850 | |
4c28f408 | 3851 | if (err != 0) |
d6b0e80f AC |
3852 | return 0; |
3853 | ||
3854 | return 1; | |
3855 | } | |
3856 | ||
28439f5e PA |
3857 | static int |
3858 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
3859 | { | |
3860 | return linux_thread_alive (ptid); | |
3861 | } | |
3862 | ||
d6b0e80f | 3863 | static char * |
117de6a9 | 3864 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
3865 | { |
3866 | static char buf[64]; | |
3867 | ||
a0ef4274 | 3868 | if (is_lwp (ptid) |
d90e17a7 PA |
3869 | && (GET_PID (ptid) != GET_LWP (ptid) |
3870 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
3871 | { |
3872 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
3873 | return buf; | |
3874 | } | |
3875 | ||
3876 | return normal_pid_to_str (ptid); | |
3877 | } | |
3878 | ||
dba24537 AC |
3879 | /* Accepts an integer PID; Returns a string representing a file that |
3880 | can be opened to get the symbols for the child process. */ | |
3881 | ||
6d8fd2b7 UW |
3882 | static char * |
3883 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
3884 | { |
3885 | char *name1, *name2; | |
3886 | ||
3887 | name1 = xmalloc (MAXPATHLEN); | |
3888 | name2 = xmalloc (MAXPATHLEN); | |
3889 | make_cleanup (xfree, name1); | |
3890 | make_cleanup (xfree, name2); | |
3891 | memset (name2, 0, MAXPATHLEN); | |
3892 | ||
3893 | sprintf (name1, "/proc/%d/exe", pid); | |
3894 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
3895 | return name2; | |
3896 | else | |
3897 | return name1; | |
3898 | } | |
3899 | ||
3900 | /* Service function for corefiles and info proc. */ | |
3901 | ||
3902 | static int | |
3903 | read_mapping (FILE *mapfile, | |
3904 | long long *addr, | |
3905 | long long *endaddr, | |
3906 | char *permissions, | |
3907 | long long *offset, | |
3908 | char *device, long long *inode, char *filename) | |
3909 | { | |
3910 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
3911 | addr, endaddr, permissions, offset, device, inode); | |
3912 | ||
2e14c2ea MS |
3913 | filename[0] = '\0'; |
3914 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
3915 | { |
3916 | /* Eat everything up to EOL for the filename. This will prevent | |
3917 | weird filenames (such as one with embedded whitespace) from | |
3918 | confusing this code. It also makes this code more robust in | |
3919 | respect to annotations the kernel may add after the filename. | |
3920 | ||
3921 | Note the filename is used for informational purposes | |
3922 | only. */ | |
3923 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
3924 | } | |
2e14c2ea | 3925 | |
dba24537 AC |
3926 | return (ret != 0 && ret != EOF); |
3927 | } | |
3928 | ||
3929 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
3930 | regions in the inferior for a corefile. */ | |
3931 | ||
3932 | static int | |
3933 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
3934 | unsigned long, | |
3935 | int, int, int, void *), void *obfd) | |
3936 | { | |
89ecc4f5 | 3937 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
3938 | char mapsfilename[MAXPATHLEN]; |
3939 | FILE *mapsfile; | |
3940 | long long addr, endaddr, size, offset, inode; | |
3941 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
3942 | int read, write, exec; | |
3943 | int ret; | |
7c8a8b04 | 3944 | struct cleanup *cleanup; |
dba24537 AC |
3945 | |
3946 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 3947 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 3948 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 3949 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 3950 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
3951 | |
3952 | if (info_verbose) | |
3953 | fprintf_filtered (gdb_stdout, | |
3954 | "Reading memory regions from %s\n", mapsfilename); | |
3955 | ||
3956 | /* Now iterate until end-of-file. */ | |
3957 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
3958 | &offset, &device[0], &inode, &filename[0])) | |
3959 | { | |
3960 | size = endaddr - addr; | |
3961 | ||
3962 | /* Get the segment's permissions. */ | |
3963 | read = (strchr (permissions, 'r') != 0); | |
3964 | write = (strchr (permissions, 'w') != 0); | |
3965 | exec = (strchr (permissions, 'x') != 0); | |
3966 | ||
3967 | if (info_verbose) | |
3968 | { | |
3969 | fprintf_filtered (gdb_stdout, | |
5af949e3 UW |
3970 | "Save segment, %lld bytes at %s (%c%c%c)", |
3971 | size, paddress (target_gdbarch, addr), | |
dba24537 AC |
3972 | read ? 'r' : ' ', |
3973 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 3974 | if (filename[0]) |
dba24537 AC |
3975 | fprintf_filtered (gdb_stdout, " for %s", filename); |
3976 | fprintf_filtered (gdb_stdout, "\n"); | |
3977 | } | |
3978 | ||
3979 | /* Invoke the callback function to create the corefile | |
3980 | segment. */ | |
3981 | func (addr, size, read, write, exec, obfd); | |
3982 | } | |
7c8a8b04 | 3983 | do_cleanups (cleanup); |
dba24537 AC |
3984 | return 0; |
3985 | } | |
3986 | ||
2020b7ab PA |
3987 | static int |
3988 | find_signalled_thread (struct thread_info *info, void *data) | |
3989 | { | |
3990 | if (info->stop_signal != TARGET_SIGNAL_0 | |
3991 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) | |
3992 | return 1; | |
3993 | ||
3994 | return 0; | |
3995 | } | |
3996 | ||
3997 | static enum target_signal | |
3998 | find_stop_signal (void) | |
3999 | { | |
4000 | struct thread_info *info = | |
4001 | iterate_over_threads (find_signalled_thread, NULL); | |
4002 | ||
4003 | if (info) | |
4004 | return info->stop_signal; | |
4005 | else | |
4006 | return TARGET_SIGNAL_0; | |
4007 | } | |
4008 | ||
dba24537 AC |
4009 | /* Records the thread's register state for the corefile note |
4010 | section. */ | |
4011 | ||
4012 | static char * | |
4013 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
4014 | char *note_data, int *note_size, |
4015 | enum target_signal stop_signal) | |
dba24537 AC |
4016 | { |
4017 | gdb_gregset_t gregs; | |
4018 | gdb_fpregset_t fpregs; | |
dba24537 | 4019 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
4020 | struct gdbarch *gdbarch = target_gdbarch; |
4021 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 4022 | const struct regset *regset; |
55e969c1 | 4023 | int core_regset_p; |
594f7785 | 4024 | struct cleanup *old_chain; |
17ea7499 CES |
4025 | struct core_regset_section *sect_list; |
4026 | char *gdb_regset; | |
594f7785 UW |
4027 | |
4028 | old_chain = save_inferior_ptid (); | |
4029 | inferior_ptid = ptid; | |
4030 | target_fetch_registers (regcache, -1); | |
4031 | do_cleanups (old_chain); | |
4f844a66 DM |
4032 | |
4033 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
4034 | sect_list = gdbarch_core_regset_sections (gdbarch); |
4035 | ||
55e969c1 DM |
4036 | if (core_regset_p |
4037 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
4038 | sizeof (gregs))) != NULL | |
4039 | && regset->collect_regset != NULL) | |
594f7785 | 4040 | regset->collect_regset (regset, regcache, -1, |
55e969c1 | 4041 | &gregs, sizeof (gregs)); |
4f844a66 | 4042 | else |
594f7785 | 4043 | fill_gregset (regcache, &gregs, -1); |
4f844a66 | 4044 | |
55e969c1 DM |
4045 | note_data = (char *) elfcore_write_prstatus (obfd, |
4046 | note_data, | |
4047 | note_size, | |
4048 | lwp, | |
4049 | stop_signal, &gregs); | |
4050 | ||
17ea7499 CES |
4051 | /* The loop below uses the new struct core_regset_section, which stores |
4052 | the supported section names and sizes for the core file. Note that | |
4053 | note PRSTATUS needs to be treated specially. But the other notes are | |
4054 | structurally the same, so they can benefit from the new struct. */ | |
4055 | if (core_regset_p && sect_list != NULL) | |
4056 | while (sect_list->sect_name != NULL) | |
4057 | { | |
4058 | /* .reg was already handled above. */ | |
4059 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
4060 | { | |
4061 | sect_list++; | |
4062 | continue; | |
4063 | } | |
4064 | regset = gdbarch_regset_from_core_section (gdbarch, | |
4065 | sect_list->sect_name, | |
4066 | sect_list->size); | |
4067 | gdb_assert (regset && regset->collect_regset); | |
4068 | gdb_regset = xmalloc (sect_list->size); | |
4069 | regset->collect_regset (regset, regcache, -1, | |
4070 | gdb_regset, sect_list->size); | |
4071 | note_data = (char *) elfcore_write_register_note (obfd, | |
4072 | note_data, | |
4073 | note_size, | |
4074 | sect_list->sect_name, | |
4075 | gdb_regset, | |
4076 | sect_list->size); | |
4077 | xfree (gdb_regset); | |
4078 | sect_list++; | |
4079 | } | |
dba24537 | 4080 | |
17ea7499 CES |
4081 | /* For architectures that does not have the struct core_regset_section |
4082 | implemented, we use the old method. When all the architectures have | |
4083 | the new support, the code below should be deleted. */ | |
4f844a66 | 4084 | else |
17ea7499 CES |
4085 | { |
4086 | if (core_regset_p | |
4087 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
4088 | sizeof (fpregs))) != NULL | |
4089 | && regset->collect_regset != NULL) | |
4090 | regset->collect_regset (regset, regcache, -1, | |
4091 | &fpregs, sizeof (fpregs)); | |
4092 | else | |
4093 | fill_fpregset (regcache, &fpregs, -1); | |
4094 | ||
4095 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
4096 | note_data, | |
4097 | note_size, | |
4098 | &fpregs, sizeof (fpregs)); | |
4099 | } | |
4f844a66 | 4100 | |
dba24537 AC |
4101 | return note_data; |
4102 | } | |
4103 | ||
4104 | struct linux_nat_corefile_thread_data | |
4105 | { | |
4106 | bfd *obfd; | |
4107 | char *note_data; | |
4108 | int *note_size; | |
4109 | int num_notes; | |
2020b7ab | 4110 | enum target_signal stop_signal; |
dba24537 AC |
4111 | }; |
4112 | ||
4113 | /* Called by gdbthread.c once per thread. Records the thread's | |
4114 | register state for the corefile note section. */ | |
4115 | ||
4116 | static int | |
4117 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
4118 | { | |
4119 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 4120 | |
dba24537 AC |
4121 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
4122 | ti->ptid, | |
4123 | args->note_data, | |
2020b7ab PA |
4124 | args->note_size, |
4125 | args->stop_signal); | |
dba24537 | 4126 | args->num_notes++; |
56be3814 | 4127 | |
dba24537 AC |
4128 | return 0; |
4129 | } | |
4130 | ||
efcbbd14 UW |
4131 | /* Enumerate spufs IDs for process PID. */ |
4132 | ||
4133 | static void | |
4134 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
4135 | { | |
4136 | char path[128]; | |
4137 | DIR *dir; | |
4138 | struct dirent *entry; | |
4139 | ||
4140 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4141 | dir = opendir (path); | |
4142 | if (!dir) | |
4143 | return; | |
4144 | ||
4145 | rewinddir (dir); | |
4146 | while ((entry = readdir (dir)) != NULL) | |
4147 | { | |
4148 | struct stat st; | |
4149 | struct statfs stfs; | |
4150 | int fd; | |
4151 | ||
4152 | fd = atoi (entry->d_name); | |
4153 | if (!fd) | |
4154 | continue; | |
4155 | ||
4156 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4157 | if (stat (path, &st) != 0) | |
4158 | continue; | |
4159 | if (!S_ISDIR (st.st_mode)) | |
4160 | continue; | |
4161 | ||
4162 | if (statfs (path, &stfs) != 0) | |
4163 | continue; | |
4164 | if (stfs.f_type != SPUFS_MAGIC) | |
4165 | continue; | |
4166 | ||
4167 | callback (data, fd); | |
4168 | } | |
4169 | ||
4170 | closedir (dir); | |
4171 | } | |
4172 | ||
4173 | /* Generate corefile notes for SPU contexts. */ | |
4174 | ||
4175 | struct linux_spu_corefile_data | |
4176 | { | |
4177 | bfd *obfd; | |
4178 | char *note_data; | |
4179 | int *note_size; | |
4180 | }; | |
4181 | ||
4182 | static void | |
4183 | linux_spu_corefile_callback (void *data, int fd) | |
4184 | { | |
4185 | struct linux_spu_corefile_data *args = data; | |
4186 | int i; | |
4187 | ||
4188 | static const char *spu_files[] = | |
4189 | { | |
4190 | "object-id", | |
4191 | "mem", | |
4192 | "regs", | |
4193 | "fpcr", | |
4194 | "lslr", | |
4195 | "decr", | |
4196 | "decr_status", | |
4197 | "signal1", | |
4198 | "signal1_type", | |
4199 | "signal2", | |
4200 | "signal2_type", | |
4201 | "event_mask", | |
4202 | "event_status", | |
4203 | "mbox_info", | |
4204 | "ibox_info", | |
4205 | "wbox_info", | |
4206 | "dma_info", | |
4207 | "proxydma_info", | |
4208 | }; | |
4209 | ||
4210 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
4211 | { | |
4212 | char annex[32], note_name[32]; | |
4213 | gdb_byte *spu_data; | |
4214 | LONGEST spu_len; | |
4215 | ||
4216 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
4217 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
4218 | annex, &spu_data); | |
4219 | if (spu_len > 0) | |
4220 | { | |
4221 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
4222 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
4223 | args->note_size, note_name, | |
4224 | NT_SPU, spu_data, spu_len); | |
4225 | xfree (spu_data); | |
4226 | } | |
4227 | } | |
4228 | } | |
4229 | ||
4230 | static char * | |
4231 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
4232 | { | |
4233 | struct linux_spu_corefile_data args; | |
4234 | args.obfd = obfd; | |
4235 | args.note_data = note_data; | |
4236 | args.note_size = note_size; | |
4237 | ||
4238 | iterate_over_spus (PIDGET (inferior_ptid), | |
4239 | linux_spu_corefile_callback, &args); | |
4240 | ||
4241 | return args.note_data; | |
4242 | } | |
4243 | ||
dba24537 AC |
4244 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
4245 | section for a corefile, and returns it in a malloc buffer. */ | |
4246 | ||
4247 | static char * | |
4248 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
4249 | { | |
4250 | struct linux_nat_corefile_thread_data thread_args; | |
4251 | struct cleanup *old_chain; | |
d99148ef | 4252 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 4253 | char fname[16] = { '\0' }; |
d99148ef | 4254 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
4255 | char psargs[80] = { '\0' }; |
4256 | char *note_data = NULL; | |
4257 | ptid_t current_ptid = inferior_ptid; | |
d90e17a7 | 4258 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 4259 | gdb_byte *auxv; |
dba24537 AC |
4260 | int auxv_len; |
4261 | ||
4262 | if (get_exec_file (0)) | |
4263 | { | |
4264 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
4265 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
4266 | if (get_inferior_args ()) | |
4267 | { | |
d99148ef JK |
4268 | char *string_end; |
4269 | char *psargs_end = psargs + sizeof (psargs); | |
4270 | ||
4271 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
4272 | strings fine. */ | |
4273 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
4274 | if (string_end != NULL) | |
4275 | { | |
4276 | *string_end++ = ' '; | |
4277 | strncpy (string_end, get_inferior_args (), | |
4278 | psargs_end - string_end); | |
4279 | } | |
dba24537 AC |
4280 | } |
4281 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
4282 | note_data, | |
4283 | note_size, fname, psargs); | |
4284 | } | |
4285 | ||
4286 | /* Dump information for threads. */ | |
4287 | thread_args.obfd = obfd; | |
4288 | thread_args.note_data = note_data; | |
4289 | thread_args.note_size = note_size; | |
4290 | thread_args.num_notes = 0; | |
2020b7ab | 4291 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 4292 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
4293 | gdb_assert (thread_args.num_notes != 0); |
4294 | note_data = thread_args.note_data; | |
dba24537 | 4295 | |
13547ab6 DJ |
4296 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
4297 | NULL, &auxv); | |
dba24537 AC |
4298 | if (auxv_len > 0) |
4299 | { | |
4300 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
4301 | "CORE", NT_AUXV, auxv, auxv_len); | |
4302 | xfree (auxv); | |
4303 | } | |
4304 | ||
efcbbd14 UW |
4305 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
4306 | ||
dba24537 AC |
4307 | make_cleanup (xfree, note_data); |
4308 | return note_data; | |
4309 | } | |
4310 | ||
4311 | /* Implement the "info proc" command. */ | |
4312 | ||
4313 | static void | |
4314 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
4315 | { | |
89ecc4f5 DE |
4316 | /* A long is used for pid instead of an int to avoid a loss of precision |
4317 | compiler warning from the output of strtoul. */ | |
4318 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
4319 | FILE *procfile; |
4320 | char **argv = NULL; | |
4321 | char buffer[MAXPATHLEN]; | |
4322 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
4323 | int cmdline_f = 1; | |
4324 | int cwd_f = 1; | |
4325 | int exe_f = 1; | |
4326 | int mappings_f = 0; | |
4327 | int environ_f = 0; | |
4328 | int status_f = 0; | |
4329 | int stat_f = 0; | |
4330 | int all = 0; | |
4331 | struct stat dummy; | |
4332 | ||
4333 | if (args) | |
4334 | { | |
4335 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
4336 | argv = gdb_buildargv (args); |
4337 | make_cleanup_freeargv (argv); | |
dba24537 AC |
4338 | } |
4339 | while (argv != NULL && *argv != NULL) | |
4340 | { | |
4341 | if (isdigit (argv[0][0])) | |
4342 | { | |
4343 | pid = strtoul (argv[0], NULL, 10); | |
4344 | } | |
4345 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
4346 | { | |
4347 | mappings_f = 1; | |
4348 | } | |
4349 | else if (strcmp (argv[0], "status") == 0) | |
4350 | { | |
4351 | status_f = 1; | |
4352 | } | |
4353 | else if (strcmp (argv[0], "stat") == 0) | |
4354 | { | |
4355 | stat_f = 1; | |
4356 | } | |
4357 | else if (strcmp (argv[0], "cmd") == 0) | |
4358 | { | |
4359 | cmdline_f = 1; | |
4360 | } | |
4361 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
4362 | { | |
4363 | exe_f = 1; | |
4364 | } | |
4365 | else if (strcmp (argv[0], "cwd") == 0) | |
4366 | { | |
4367 | cwd_f = 1; | |
4368 | } | |
4369 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
4370 | { | |
4371 | all = 1; | |
4372 | } | |
4373 | else | |
4374 | { | |
4375 | /* [...] (future options here) */ | |
4376 | } | |
4377 | argv++; | |
4378 | } | |
4379 | if (pid == 0) | |
8a3fe4f8 | 4380 | error (_("No current process: you must name one.")); |
dba24537 | 4381 | |
89ecc4f5 | 4382 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4383 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4384 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4385 | |
89ecc4f5 | 4386 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
4387 | if (cmdline_f || all) |
4388 | { | |
89ecc4f5 | 4389 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4390 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4391 | { |
7c8a8b04 | 4392 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
bf1d7d9c JB |
4393 | if (fgets (buffer, sizeof (buffer), procfile)) |
4394 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4395 | else | |
4396 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4397 | do_cleanups (cleanup); |
dba24537 AC |
4398 | } |
4399 | else | |
8a3fe4f8 | 4400 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4401 | } |
4402 | if (cwd_f || all) | |
4403 | { | |
89ecc4f5 | 4404 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4405 | memset (fname2, 0, sizeof (fname2)); |
4406 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4407 | printf_filtered ("cwd = '%s'\n", fname2); | |
4408 | else | |
8a3fe4f8 | 4409 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4410 | } |
4411 | if (exe_f || all) | |
4412 | { | |
89ecc4f5 | 4413 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4414 | memset (fname2, 0, sizeof (fname2)); |
4415 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4416 | printf_filtered ("exe = '%s'\n", fname2); | |
4417 | else | |
8a3fe4f8 | 4418 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4419 | } |
4420 | if (mappings_f || all) | |
4421 | { | |
89ecc4f5 | 4422 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4423 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4424 | { |
4425 | long long addr, endaddr, size, offset, inode; | |
4426 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4427 | struct cleanup *cleanup; |
dba24537 | 4428 | |
7c8a8b04 | 4429 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4430 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4431 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4432 | { |
4433 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4434 | "Start Addr", | |
4435 | " End Addr", | |
4436 | " Size", " Offset", "objfile"); | |
4437 | } | |
4438 | else | |
4439 | { | |
4440 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4441 | "Start Addr", | |
4442 | " End Addr", | |
4443 | " Size", " Offset", "objfile"); | |
4444 | } | |
4445 | ||
4446 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4447 | &offset, &device[0], &inode, &filename[0])) | |
4448 | { | |
4449 | size = endaddr - addr; | |
4450 | ||
4451 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4452 | calls here (and possibly above) should be abstracted | |
4453 | out into their own functions? Andrew suggests using | |
4454 | a generic local_address_string instead to print out | |
4455 | the addresses; that makes sense to me, too. */ | |
4456 | ||
a97b0ac8 | 4457 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4458 | { |
4459 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4460 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4461 | (unsigned long) endaddr, | |
4462 | (int) size, | |
4463 | (unsigned int) offset, | |
4464 | filename[0] ? filename : ""); | |
4465 | } | |
4466 | else | |
4467 | { | |
4468 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4469 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4470 | (unsigned long) endaddr, | |
4471 | (int) size, | |
4472 | (unsigned int) offset, | |
4473 | filename[0] ? filename : ""); | |
4474 | } | |
4475 | } | |
4476 | ||
7c8a8b04 | 4477 | do_cleanups (cleanup); |
dba24537 AC |
4478 | } |
4479 | else | |
8a3fe4f8 | 4480 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4481 | } |
4482 | if (status_f || all) | |
4483 | { | |
89ecc4f5 | 4484 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4485 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4486 | { |
7c8a8b04 | 4487 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4488 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4489 | puts_filtered (buffer); | |
7c8a8b04 | 4490 | do_cleanups (cleanup); |
dba24537 AC |
4491 | } |
4492 | else | |
8a3fe4f8 | 4493 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4494 | } |
4495 | if (stat_f || all) | |
4496 | { | |
89ecc4f5 | 4497 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4498 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4499 | { |
4500 | int itmp; | |
4501 | char ctmp; | |
a25694b4 | 4502 | long ltmp; |
7c8a8b04 | 4503 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4504 | |
4505 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4506 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4507 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4508 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4509 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4510 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4511 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4512 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4513 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4514 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4515 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4516 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4517 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4518 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4519 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4520 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4521 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4522 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4523 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4524 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4525 | (unsigned long) ltmp); | |
4526 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4527 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4528 | (unsigned long) ltmp); | |
4529 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4530 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4531 | (unsigned long) ltmp); | |
4532 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4533 | printf_filtered (_("Major faults, children: %lu\n"), | |
4534 | (unsigned long) ltmp); | |
4535 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4536 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4537 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4538 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4539 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4540 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4541 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4542 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4543 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4544 | printf_filtered (_("jiffies remaining in current time slice: %ld\n"), | |
4545 | ltmp); | |
4546 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4547 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4548 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4549 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4550 | (unsigned long) ltmp); | |
4551 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4552 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4553 | (unsigned long) ltmp); | |
4554 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4555 | printf_filtered (_("start time (jiffies since system boot): %ld\n"), | |
4556 | ltmp); | |
4557 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4558 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4559 | (unsigned long) ltmp); | |
4560 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4561 | printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp); | |
4562 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4563 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4564 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4565 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4566 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4567 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4568 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4569 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
dba24537 AC |
4570 | #if 0 /* Don't know how architecture-dependent the rest is... |
4571 | Anyway the signal bitmap info is available from "status". */ | |
a25694b4 AS |
4572 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
4573 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); | |
4574 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
4575 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); | |
4576 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4577 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
4578 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4579 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
4580 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4581 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
4582 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4583 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
4584 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
4585 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); | |
dba24537 | 4586 | #endif |
7c8a8b04 | 4587 | do_cleanups (cleanup); |
dba24537 AC |
4588 | } |
4589 | else | |
8a3fe4f8 | 4590 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4591 | } |
4592 | } | |
4593 | ||
10d6c8cd DJ |
4594 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
4595 | filesystem. Because we can use a single read() call for /proc, this | |
4596 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
4597 | but it doesn't support writes. */ | |
4598 | ||
4599 | static LONGEST | |
4600 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
4601 | const char *annex, gdb_byte *readbuf, | |
4602 | const gdb_byte *writebuf, | |
4603 | ULONGEST offset, LONGEST len) | |
dba24537 | 4604 | { |
10d6c8cd DJ |
4605 | LONGEST ret; |
4606 | int fd; | |
dba24537 AC |
4607 | char filename[64]; |
4608 | ||
10d6c8cd | 4609 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
4610 | return 0; |
4611 | ||
4612 | /* Don't bother for one word. */ | |
4613 | if (len < 3 * sizeof (long)) | |
4614 | return 0; | |
4615 | ||
4616 | /* We could keep this file open and cache it - possibly one per | |
4617 | thread. That requires some juggling, but is even faster. */ | |
4618 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
4619 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
4620 | if (fd == -1) | |
4621 | return 0; | |
4622 | ||
4623 | /* If pread64 is available, use it. It's faster if the kernel | |
4624 | supports it (only one syscall), and it's 64-bit safe even on | |
4625 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4626 | application). */ | |
4627 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4628 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4629 | #else |
10d6c8cd | 4630 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4631 | #endif |
4632 | ret = 0; | |
4633 | else | |
4634 | ret = len; | |
4635 | ||
4636 | close (fd); | |
4637 | return ret; | |
4638 | } | |
4639 | ||
efcbbd14 UW |
4640 | |
4641 | /* Enumerate spufs IDs for process PID. */ | |
4642 | static LONGEST | |
4643 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
4644 | { | |
4645 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
4646 | LONGEST pos = 0; | |
4647 | LONGEST written = 0; | |
4648 | char path[128]; | |
4649 | DIR *dir; | |
4650 | struct dirent *entry; | |
4651 | ||
4652 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4653 | dir = opendir (path); | |
4654 | if (!dir) | |
4655 | return -1; | |
4656 | ||
4657 | rewinddir (dir); | |
4658 | while ((entry = readdir (dir)) != NULL) | |
4659 | { | |
4660 | struct stat st; | |
4661 | struct statfs stfs; | |
4662 | int fd; | |
4663 | ||
4664 | fd = atoi (entry->d_name); | |
4665 | if (!fd) | |
4666 | continue; | |
4667 | ||
4668 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4669 | if (stat (path, &st) != 0) | |
4670 | continue; | |
4671 | if (!S_ISDIR (st.st_mode)) | |
4672 | continue; | |
4673 | ||
4674 | if (statfs (path, &stfs) != 0) | |
4675 | continue; | |
4676 | if (stfs.f_type != SPUFS_MAGIC) | |
4677 | continue; | |
4678 | ||
4679 | if (pos >= offset && pos + 4 <= offset + len) | |
4680 | { | |
4681 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
4682 | written += 4; | |
4683 | } | |
4684 | pos += 4; | |
4685 | } | |
4686 | ||
4687 | closedir (dir); | |
4688 | return written; | |
4689 | } | |
4690 | ||
4691 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4692 | object type, using the /proc file system. */ | |
4693 | static LONGEST | |
4694 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
4695 | const char *annex, gdb_byte *readbuf, | |
4696 | const gdb_byte *writebuf, | |
4697 | ULONGEST offset, LONGEST len) | |
4698 | { | |
4699 | char buf[128]; | |
4700 | int fd = 0; | |
4701 | int ret = -1; | |
4702 | int pid = PIDGET (inferior_ptid); | |
4703 | ||
4704 | if (!annex) | |
4705 | { | |
4706 | if (!readbuf) | |
4707 | return -1; | |
4708 | else | |
4709 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4710 | } | |
4711 | ||
4712 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
4713 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4714 | if (fd <= 0) | |
4715 | return -1; | |
4716 | ||
4717 | if (offset != 0 | |
4718 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4719 | { | |
4720 | close (fd); | |
4721 | return 0; | |
4722 | } | |
4723 | ||
4724 | if (writebuf) | |
4725 | ret = write (fd, writebuf, (size_t) len); | |
4726 | else if (readbuf) | |
4727 | ret = read (fd, readbuf, (size_t) len); | |
4728 | ||
4729 | close (fd); | |
4730 | return ret; | |
4731 | } | |
4732 | ||
4733 | ||
dba24537 AC |
4734 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
4735 | ||
4736 | static void | |
4737 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4738 | { | |
4739 | int len = strlen (line) - 1; | |
4740 | const char *p; | |
4741 | int signum; | |
4742 | ||
4743 | if (line[len] != '\n') | |
8a3fe4f8 | 4744 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4745 | |
4746 | p = line; | |
4747 | signum = len * 4; | |
4748 | while (len-- > 0) | |
4749 | { | |
4750 | int digit; | |
4751 | ||
4752 | if (*p >= '0' && *p <= '9') | |
4753 | digit = *p - '0'; | |
4754 | else if (*p >= 'a' && *p <= 'f') | |
4755 | digit = *p - 'a' + 10; | |
4756 | else | |
8a3fe4f8 | 4757 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4758 | |
4759 | signum -= 4; | |
4760 | ||
4761 | if (digit & 1) | |
4762 | sigaddset (sigs, signum + 1); | |
4763 | if (digit & 2) | |
4764 | sigaddset (sigs, signum + 2); | |
4765 | if (digit & 4) | |
4766 | sigaddset (sigs, signum + 3); | |
4767 | if (digit & 8) | |
4768 | sigaddset (sigs, signum + 4); | |
4769 | ||
4770 | p++; | |
4771 | } | |
4772 | } | |
4773 | ||
4774 | /* Find process PID's pending signals from /proc/pid/status and set | |
4775 | SIGS to match. */ | |
4776 | ||
4777 | void | |
4778 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
4779 | { | |
4780 | FILE *procfile; | |
4781 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
4782 | int signum; | |
7c8a8b04 | 4783 | struct cleanup *cleanup; |
dba24537 AC |
4784 | |
4785 | sigemptyset (pending); | |
4786 | sigemptyset (blocked); | |
4787 | sigemptyset (ignored); | |
4788 | sprintf (fname, "/proc/%d/status", pid); | |
4789 | procfile = fopen (fname, "r"); | |
4790 | if (procfile == NULL) | |
8a3fe4f8 | 4791 | error (_("Could not open %s"), fname); |
7c8a8b04 | 4792 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4793 | |
4794 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
4795 | { | |
4796 | /* Normal queued signals are on the SigPnd line in the status | |
4797 | file. However, 2.6 kernels also have a "shared" pending | |
4798 | queue for delivering signals to a thread group, so check for | |
4799 | a ShdPnd line also. | |
4800 | ||
4801 | Unfortunately some Red Hat kernels include the shared pending | |
4802 | queue but not the ShdPnd status field. */ | |
4803 | ||
4804 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
4805 | add_line_to_sigset (buffer + 8, pending); | |
4806 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
4807 | add_line_to_sigset (buffer + 8, pending); | |
4808 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
4809 | add_line_to_sigset (buffer + 8, blocked); | |
4810 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
4811 | add_line_to_sigset (buffer + 8, ignored); | |
4812 | } | |
4813 | ||
7c8a8b04 | 4814 | do_cleanups (cleanup); |
dba24537 AC |
4815 | } |
4816 | ||
07e059b5 VP |
4817 | static LONGEST |
4818 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
4819 | const char *annex, gdb_byte *readbuf, | |
4820 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4821 | { | |
4822 | /* We make the process list snapshot when the object starts to be | |
4823 | read. */ | |
4824 | static const char *buf; | |
4825 | static LONGEST len_avail = -1; | |
4826 | static struct obstack obstack; | |
4827 | ||
4828 | DIR *dirp; | |
4829 | ||
4830 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
4831 | ||
4832 | if (strcmp (annex, "processes") != 0) | |
4833 | return 0; | |
4834 | ||
4835 | gdb_assert (readbuf && !writebuf); | |
4836 | ||
4837 | if (offset == 0) | |
4838 | { | |
4839 | if (len_avail != -1 && len_avail != 0) | |
4840 | obstack_free (&obstack, NULL); | |
4841 | len_avail = 0; | |
4842 | buf = NULL; | |
4843 | obstack_init (&obstack); | |
4844 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
4845 | ||
4846 | dirp = opendir ("/proc"); | |
4847 | if (dirp) | |
4848 | { | |
4849 | struct dirent *dp; | |
4850 | while ((dp = readdir (dirp)) != NULL) | |
4851 | { | |
4852 | struct stat statbuf; | |
4853 | char procentry[sizeof ("/proc/4294967295")]; | |
4854 | ||
4855 | if (!isdigit (dp->d_name[0]) | |
1a6d2f2f | 4856 | || NAMELEN (dp) > sizeof ("4294967295") - 1) |
07e059b5 VP |
4857 | continue; |
4858 | ||
4859 | sprintf (procentry, "/proc/%s", dp->d_name); | |
4860 | if (stat (procentry, &statbuf) == 0 | |
4861 | && S_ISDIR (statbuf.st_mode)) | |
4862 | { | |
4863 | char *pathname; | |
4864 | FILE *f; | |
4865 | char cmd[MAXPATHLEN + 1]; | |
4866 | struct passwd *entry; | |
4867 | ||
4868 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
4869 | entry = getpwuid (statbuf.st_uid); | |
4870 | ||
4871 | if ((f = fopen (pathname, "r")) != NULL) | |
4872 | { | |
4873 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
4874 | if (len > 0) | |
4875 | { | |
4876 | int i; | |
4877 | for (i = 0; i < len; i++) | |
4878 | if (cmd[i] == '\0') | |
4879 | cmd[i] = ' '; | |
4880 | cmd[len] = '\0'; | |
4881 | ||
4882 | obstack_xml_printf ( | |
4883 | &obstack, | |
4884 | "<item>" | |
4885 | "<column name=\"pid\">%s</column>" | |
4886 | "<column name=\"user\">%s</column>" | |
4887 | "<column name=\"command\">%s</column>" | |
4888 | "</item>", | |
4889 | dp->d_name, | |
4890 | entry ? entry->pw_name : "?", | |
4891 | cmd); | |
4892 | } | |
4893 | fclose (f); | |
4894 | } | |
4895 | ||
4896 | xfree (pathname); | |
4897 | } | |
4898 | } | |
4899 | ||
4900 | closedir (dirp); | |
4901 | } | |
4902 | ||
4903 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
4904 | buf = obstack_finish (&obstack); | |
4905 | len_avail = strlen (buf); | |
4906 | } | |
4907 | ||
4908 | if (offset >= len_avail) | |
4909 | { | |
4910 | /* Done. Get rid of the obstack. */ | |
4911 | obstack_free (&obstack, NULL); | |
4912 | buf = NULL; | |
4913 | len_avail = 0; | |
4914 | return 0; | |
4915 | } | |
4916 | ||
4917 | if (len > len_avail - offset) | |
4918 | len = len_avail - offset; | |
4919 | memcpy (readbuf, buf + offset, len); | |
4920 | ||
4921 | return len; | |
4922 | } | |
4923 | ||
10d6c8cd DJ |
4924 | static LONGEST |
4925 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
4926 | const char *annex, gdb_byte *readbuf, | |
4927 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4928 | { | |
4929 | LONGEST xfer; | |
4930 | ||
4931 | if (object == TARGET_OBJECT_AUXV) | |
4932 | return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf, | |
4933 | offset, len); | |
4934 | ||
07e059b5 VP |
4935 | if (object == TARGET_OBJECT_OSDATA) |
4936 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
4937 | offset, len); | |
4938 | ||
efcbbd14 UW |
4939 | if (object == TARGET_OBJECT_SPU) |
4940 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
4941 | offset, len); | |
4942 | ||
8f313923 JK |
4943 | /* GDB calculates all the addresses in possibly larget width of the address. |
4944 | Address width needs to be masked before its final use - either by | |
4945 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
4946 | ||
4947 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
4948 | ||
4949 | if (object == TARGET_OBJECT_MEMORY) | |
4950 | { | |
4951 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
4952 | ||
4953 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
4954 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
4955 | } | |
4956 | ||
10d6c8cd DJ |
4957 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
4958 | offset, len); | |
4959 | if (xfer != 0) | |
4960 | return xfer; | |
4961 | ||
4962 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
4963 | offset, len); | |
4964 | } | |
4965 | ||
e9efe249 | 4966 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
4967 | it with local methods. */ |
4968 | ||
910122bf UW |
4969 | static void |
4970 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 4971 | { |
6d8fd2b7 UW |
4972 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
4973 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; | |
4974 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; | |
a96d9b2e | 4975 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 4976 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 4977 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
4978 | t->to_post_attach = linux_child_post_attach; |
4979 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
4980 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
4981 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
4982 | ||
4983 | super_xfer_partial = t->to_xfer_partial; | |
4984 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
4985 | } |
4986 | ||
4987 | struct target_ops * | |
4988 | linux_target (void) | |
4989 | { | |
4990 | struct target_ops *t; | |
4991 | ||
4992 | t = inf_ptrace_target (); | |
4993 | linux_target_install_ops (t); | |
4994 | ||
4995 | return t; | |
4996 | } | |
4997 | ||
4998 | struct target_ops * | |
7714d83a | 4999 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
5000 | { |
5001 | struct target_ops *t; | |
5002 | ||
5003 | t = inf_ptrace_trad_target (register_u_offset); | |
5004 | linux_target_install_ops (t); | |
10d6c8cd | 5005 | |
10d6c8cd DJ |
5006 | return t; |
5007 | } | |
5008 | ||
b84876c2 PA |
5009 | /* target_is_async_p implementation. */ |
5010 | ||
5011 | static int | |
5012 | linux_nat_is_async_p (void) | |
5013 | { | |
5014 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5015 | it explicitly with the "set target-async" command. |
b84876c2 | 5016 | Someday, linux will always be async. */ |
c6ebd6cf | 5017 | if (!target_async_permitted) |
b84876c2 PA |
5018 | return 0; |
5019 | ||
d90e17a7 PA |
5020 | /* See target.h/target_async_mask. */ |
5021 | return linux_nat_async_mask_value; | |
b84876c2 PA |
5022 | } |
5023 | ||
5024 | /* target_can_async_p implementation. */ | |
5025 | ||
5026 | static int | |
5027 | linux_nat_can_async_p (void) | |
5028 | { | |
5029 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5030 | it explicitly with the "set target-async" command. |
b84876c2 | 5031 | Someday, linux will always be async. */ |
c6ebd6cf | 5032 | if (!target_async_permitted) |
b84876c2 PA |
5033 | return 0; |
5034 | ||
5035 | /* See target.h/target_async_mask. */ | |
5036 | return linux_nat_async_mask_value; | |
5037 | } | |
5038 | ||
9908b566 VP |
5039 | static int |
5040 | linux_nat_supports_non_stop (void) | |
5041 | { | |
5042 | return 1; | |
5043 | } | |
5044 | ||
d90e17a7 PA |
5045 | /* True if we want to support multi-process. To be removed when GDB |
5046 | supports multi-exec. */ | |
5047 | ||
2277426b | 5048 | int linux_multi_process = 1; |
d90e17a7 PA |
5049 | |
5050 | static int | |
5051 | linux_nat_supports_multi_process (void) | |
5052 | { | |
5053 | return linux_multi_process; | |
5054 | } | |
5055 | ||
b84876c2 PA |
5056 | /* target_async_mask implementation. */ |
5057 | ||
5058 | static int | |
7feb7d06 | 5059 | linux_nat_async_mask (int new_mask) |
b84876c2 | 5060 | { |
7feb7d06 | 5061 | int curr_mask = linux_nat_async_mask_value; |
b84876c2 | 5062 | |
7feb7d06 | 5063 | if (curr_mask != new_mask) |
b84876c2 | 5064 | { |
7feb7d06 | 5065 | if (new_mask == 0) |
b84876c2 PA |
5066 | { |
5067 | linux_nat_async (NULL, 0); | |
7feb7d06 | 5068 | linux_nat_async_mask_value = new_mask; |
b84876c2 PA |
5069 | } |
5070 | else | |
5071 | { | |
7feb7d06 | 5072 | linux_nat_async_mask_value = new_mask; |
84e46146 | 5073 | |
7feb7d06 PA |
5074 | /* If we're going out of async-mask in all-stop, then the |
5075 | inferior is stopped. The next resume will call | |
5076 | target_async. In non-stop, the target event source | |
5077 | should be always registered in the event loop. Do so | |
5078 | now. */ | |
5079 | if (non_stop) | |
5080 | linux_nat_async (inferior_event_handler, 0); | |
b84876c2 PA |
5081 | } |
5082 | } | |
5083 | ||
7feb7d06 | 5084 | return curr_mask; |
b84876c2 PA |
5085 | } |
5086 | ||
5087 | static int async_terminal_is_ours = 1; | |
5088 | ||
5089 | /* target_terminal_inferior implementation. */ | |
5090 | ||
5091 | static void | |
5092 | linux_nat_terminal_inferior (void) | |
5093 | { | |
5094 | if (!target_is_async_p ()) | |
5095 | { | |
5096 | /* Async mode is disabled. */ | |
5097 | terminal_inferior (); | |
5098 | return; | |
5099 | } | |
5100 | ||
b84876c2 PA |
5101 | terminal_inferior (); |
5102 | ||
d9d2d8b6 | 5103 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
5104 | if (!async_terminal_is_ours) |
5105 | return; | |
5106 | ||
5107 | delete_file_handler (input_fd); | |
5108 | async_terminal_is_ours = 0; | |
5109 | set_sigint_trap (); | |
5110 | } | |
5111 | ||
5112 | /* target_terminal_ours implementation. */ | |
5113 | ||
2c0b251b | 5114 | static void |
b84876c2 PA |
5115 | linux_nat_terminal_ours (void) |
5116 | { | |
5117 | if (!target_is_async_p ()) | |
5118 | { | |
5119 | /* Async mode is disabled. */ | |
5120 | terminal_ours (); | |
5121 | return; | |
5122 | } | |
5123 | ||
5124 | /* GDB should never give the terminal to the inferior if the | |
5125 | inferior is running in the background (run&, continue&, etc.), | |
5126 | but claiming it sure should. */ | |
5127 | terminal_ours (); | |
5128 | ||
b84876c2 PA |
5129 | if (async_terminal_is_ours) |
5130 | return; | |
5131 | ||
5132 | clear_sigint_trap (); | |
5133 | add_file_handler (input_fd, stdin_event_handler, 0); | |
5134 | async_terminal_is_ours = 1; | |
5135 | } | |
5136 | ||
5137 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
5138 | void *context); | |
5139 | static void *async_client_context; | |
5140 | ||
7feb7d06 PA |
5141 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5142 | so we notice when any child changes state, and notify the | |
5143 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
5144 | above to wait for the arrival of a SIGCHLD. */ | |
5145 | ||
b84876c2 | 5146 | static void |
7feb7d06 | 5147 | sigchld_handler (int signo) |
b84876c2 | 5148 | { |
7feb7d06 PA |
5149 | int old_errno = errno; |
5150 | ||
5151 | if (debug_linux_nat_async) | |
5152 | fprintf_unfiltered (gdb_stdlog, "sigchld\n"); | |
5153 | ||
5154 | if (signo == SIGCHLD | |
5155 | && linux_nat_event_pipe[0] != -1) | |
5156 | async_file_mark (); /* Let the event loop know that there are | |
5157 | events to handle. */ | |
5158 | ||
5159 | errno = old_errno; | |
5160 | } | |
5161 | ||
5162 | /* Callback registered with the target events file descriptor. */ | |
5163 | ||
5164 | static void | |
5165 | handle_target_event (int error, gdb_client_data client_data) | |
5166 | { | |
5167 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
5168 | } | |
5169 | ||
5170 | /* Create/destroy the target events pipe. Returns previous state. */ | |
5171 | ||
5172 | static int | |
5173 | linux_async_pipe (int enable) | |
5174 | { | |
5175 | int previous = (linux_nat_event_pipe[0] != -1); | |
5176 | ||
5177 | if (previous != enable) | |
5178 | { | |
5179 | sigset_t prev_mask; | |
5180 | ||
5181 | block_child_signals (&prev_mask); | |
5182 | ||
5183 | if (enable) | |
5184 | { | |
5185 | if (pipe (linux_nat_event_pipe) == -1) | |
5186 | internal_error (__FILE__, __LINE__, | |
5187 | "creating event pipe failed."); | |
5188 | ||
5189 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5190 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5191 | } | |
5192 | else | |
5193 | { | |
5194 | close (linux_nat_event_pipe[0]); | |
5195 | close (linux_nat_event_pipe[1]); | |
5196 | linux_nat_event_pipe[0] = -1; | |
5197 | linux_nat_event_pipe[1] = -1; | |
5198 | } | |
5199 | ||
5200 | restore_child_signals_mask (&prev_mask); | |
5201 | } | |
5202 | ||
5203 | return previous; | |
b84876c2 PA |
5204 | } |
5205 | ||
5206 | /* target_async implementation. */ | |
5207 | ||
5208 | static void | |
5209 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
5210 | void *context), void *context) | |
5211 | { | |
c6ebd6cf | 5212 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
5213 | internal_error (__FILE__, __LINE__, |
5214 | "Calling target_async when async is masked"); | |
5215 | ||
5216 | if (callback != NULL) | |
5217 | { | |
5218 | async_client_callback = callback; | |
5219 | async_client_context = context; | |
7feb7d06 PA |
5220 | if (!linux_async_pipe (1)) |
5221 | { | |
5222 | add_file_handler (linux_nat_event_pipe[0], | |
5223 | handle_target_event, NULL); | |
5224 | /* There may be pending events to handle. Tell the event loop | |
5225 | to poll them. */ | |
5226 | async_file_mark (); | |
5227 | } | |
b84876c2 PA |
5228 | } |
5229 | else | |
5230 | { | |
5231 | async_client_callback = callback; | |
5232 | async_client_context = context; | |
b84876c2 | 5233 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 5234 | linux_async_pipe (0); |
b84876c2 PA |
5235 | } |
5236 | return; | |
5237 | } | |
5238 | ||
252fbfc8 PA |
5239 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
5240 | event came out. */ | |
5241 | ||
4c28f408 | 5242 | static int |
252fbfc8 | 5243 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 5244 | { |
d90e17a7 | 5245 | if (!lwp->stopped) |
252fbfc8 | 5246 | { |
d90e17a7 PA |
5247 | int pid, status; |
5248 | ptid_t ptid = lwp->ptid; | |
252fbfc8 | 5249 | |
d90e17a7 PA |
5250 | if (debug_linux_nat) |
5251 | fprintf_unfiltered (gdb_stdlog, | |
5252 | "LNSL: running -> suspending %s\n", | |
5253 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 5254 | |
252fbfc8 | 5255 | |
d90e17a7 PA |
5256 | stop_callback (lwp, NULL); |
5257 | stop_wait_callback (lwp, NULL); | |
252fbfc8 | 5258 | |
d90e17a7 PA |
5259 | /* If the lwp exits while we try to stop it, there's nothing |
5260 | else to do. */ | |
5261 | lwp = find_lwp_pid (ptid); | |
5262 | if (lwp == NULL) | |
5263 | return 0; | |
252fbfc8 | 5264 | |
d90e17a7 PA |
5265 | /* If we didn't collect any signal other than SIGSTOP while |
5266 | stopping the LWP, push a SIGNAL_0 event. In either case, the | |
5267 | event-loop will end up calling target_wait which will collect | |
5268 | these. */ | |
5269 | if (lwp->status == 0) | |
5270 | lwp->status = W_STOPCODE (0); | |
5271 | async_file_mark (); | |
5272 | } | |
5273 | else | |
5274 | { | |
5275 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 5276 | |
d90e17a7 PA |
5277 | if (debug_linux_nat) |
5278 | { | |
e09875d4 | 5279 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
d90e17a7 | 5280 | fprintf_unfiltered (gdb_stdlog, "\ |
252fbfc8 | 5281 | LNSL: already stopped/stop_requested %s\n", |
d90e17a7 PA |
5282 | target_pid_to_str (lwp->ptid)); |
5283 | else | |
5284 | fprintf_unfiltered (gdb_stdlog, "\ | |
252fbfc8 | 5285 | LNSL: already stopped/no stop_requested yet %s\n", |
d90e17a7 | 5286 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
5287 | } |
5288 | } | |
4c28f408 PA |
5289 | return 0; |
5290 | } | |
5291 | ||
5292 | static void | |
5293 | linux_nat_stop (ptid_t ptid) | |
5294 | { | |
5295 | if (non_stop) | |
d90e17a7 | 5296 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
5297 | else |
5298 | linux_ops->to_stop (ptid); | |
5299 | } | |
5300 | ||
d90e17a7 PA |
5301 | static void |
5302 | linux_nat_close (int quitting) | |
5303 | { | |
5304 | /* Unregister from the event loop. */ | |
5305 | if (target_is_async_p ()) | |
5306 | target_async (NULL, 0); | |
5307 | ||
5308 | /* Reset the async_masking. */ | |
5309 | linux_nat_async_mask_value = 1; | |
5310 | ||
5311 | if (linux_ops->to_close) | |
5312 | linux_ops->to_close (quitting); | |
5313 | } | |
5314 | ||
c0694254 PA |
5315 | /* When requests are passed down from the linux-nat layer to the |
5316 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
5317 | used. The address space pointer is stored in the inferior object, | |
5318 | but the common code that is passed such ptid can't tell whether | |
5319 | lwpid is a "main" process id or not (it assumes so). We reverse | |
5320 | look up the "main" process id from the lwp here. */ | |
5321 | ||
5322 | struct address_space * | |
5323 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) | |
5324 | { | |
5325 | struct lwp_info *lwp; | |
5326 | struct inferior *inf; | |
5327 | int pid; | |
5328 | ||
5329 | pid = GET_LWP (ptid); | |
5330 | if (GET_LWP (ptid) == 0) | |
5331 | { | |
5332 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
5333 | tgid. */ | |
5334 | lwp = find_lwp_pid (ptid); | |
5335 | pid = GET_PID (lwp->ptid); | |
5336 | } | |
5337 | else | |
5338 | { | |
5339 | /* A (pid,lwpid,0) ptid. */ | |
5340 | pid = GET_PID (ptid); | |
5341 | } | |
5342 | ||
5343 | inf = find_inferior_pid (pid); | |
5344 | gdb_assert (inf != NULL); | |
5345 | return inf->aspace; | |
5346 | } | |
5347 | ||
f973ed9c DJ |
5348 | void |
5349 | linux_nat_add_target (struct target_ops *t) | |
5350 | { | |
f973ed9c DJ |
5351 | /* Save the provided single-threaded target. We save this in a separate |
5352 | variable because another target we've inherited from (e.g. inf-ptrace) | |
5353 | may have saved a pointer to T; we want to use it for the final | |
5354 | process stratum target. */ | |
5355 | linux_ops_saved = *t; | |
5356 | linux_ops = &linux_ops_saved; | |
5357 | ||
5358 | /* Override some methods for multithreading. */ | |
b84876c2 | 5359 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
5360 | t->to_attach = linux_nat_attach; |
5361 | t->to_detach = linux_nat_detach; | |
5362 | t->to_resume = linux_nat_resume; | |
5363 | t->to_wait = linux_nat_wait; | |
5364 | t->to_xfer_partial = linux_nat_xfer_partial; | |
5365 | t->to_kill = linux_nat_kill; | |
5366 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
5367 | t->to_thread_alive = linux_nat_thread_alive; | |
5368 | t->to_pid_to_str = linux_nat_pid_to_str; | |
5369 | t->to_has_thread_control = tc_schedlock; | |
c0694254 | 5370 | t->to_thread_address_space = linux_nat_thread_address_space; |
f973ed9c | 5371 | |
b84876c2 PA |
5372 | t->to_can_async_p = linux_nat_can_async_p; |
5373 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5374 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
5375 | t->to_async = linux_nat_async; |
5376 | t->to_async_mask = linux_nat_async_mask; | |
5377 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
5378 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5379 | t->to_close = linux_nat_close; |
b84876c2 | 5380 | |
4c28f408 PA |
5381 | /* Methods for non-stop support. */ |
5382 | t->to_stop = linux_nat_stop; | |
5383 | ||
d90e17a7 PA |
5384 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5385 | ||
f973ed9c DJ |
5386 | /* We don't change the stratum; this target will sit at |
5387 | process_stratum and thread_db will set at thread_stratum. This | |
5388 | is a little strange, since this is a multi-threaded-capable | |
5389 | target, but we want to be on the stack below thread_db, and we | |
5390 | also want to be used for single-threaded processes. */ | |
5391 | ||
5392 | add_target (t); | |
f973ed9c DJ |
5393 | } |
5394 | ||
9f0bdab8 DJ |
5395 | /* Register a method to call whenever a new thread is attached. */ |
5396 | void | |
5397 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5398 | { | |
5399 | /* Save the pointer. We only support a single registered instance | |
5400 | of the GNU/Linux native target, so we do not need to map this to | |
5401 | T. */ | |
5402 | linux_nat_new_thread = new_thread; | |
5403 | } | |
5404 | ||
5b009018 PA |
5405 | /* Register a method that converts a siginfo object between the layout |
5406 | that ptrace returns, and the layout in the architecture of the | |
5407 | inferior. */ | |
5408 | void | |
5409 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5410 | int (*siginfo_fixup) (struct siginfo *, | |
5411 | gdb_byte *, | |
5412 | int)) | |
5413 | { | |
5414 | /* Save the pointer. */ | |
5415 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5416 | } | |
5417 | ||
9f0bdab8 DJ |
5418 | /* Return the saved siginfo associated with PTID. */ |
5419 | struct siginfo * | |
5420 | linux_nat_get_siginfo (ptid_t ptid) | |
5421 | { | |
5422 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5423 | ||
5424 | gdb_assert (lp != NULL); | |
5425 | ||
5426 | return &lp->siginfo; | |
5427 | } | |
5428 | ||
2c0b251b PA |
5429 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5430 | extern initialize_file_ftype _initialize_linux_nat; | |
5431 | ||
d6b0e80f AC |
5432 | void |
5433 | _initialize_linux_nat (void) | |
5434 | { | |
b84876c2 | 5435 | sigset_t mask; |
dba24537 | 5436 | |
1bedd215 AC |
5437 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
5438 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
5439 | Specify any process id, or use the program being debugged by default.\n\ |
5440 | Specify any of the following keywords for detailed info:\n\ | |
5441 | mappings -- list of mapped memory regions.\n\ | |
5442 | stat -- list a bunch of random process info.\n\ | |
5443 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 5444 | all -- list all available /proc info.")); |
d6b0e80f | 5445 | |
b84876c2 PA |
5446 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5447 | &debug_linux_nat, _("\ | |
5448 | Set debugging of GNU/Linux lwp module."), _("\ | |
5449 | Show debugging of GNU/Linux lwp module."), _("\ | |
5450 | Enables printf debugging output."), | |
5451 | NULL, | |
5452 | show_debug_linux_nat, | |
5453 | &setdebuglist, &showdebuglist); | |
5454 | ||
5455 | add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance, | |
5456 | &debug_linux_nat_async, _("\ | |
5457 | Set debugging of GNU/Linux async lwp module."), _("\ | |
5458 | Show debugging of GNU/Linux async lwp module."), _("\ | |
5459 | Enables printf debugging output."), | |
5460 | NULL, | |
5461 | show_debug_linux_nat_async, | |
5462 | &setdebuglist, &showdebuglist); | |
5463 | ||
b84876c2 | 5464 | /* Save this mask as the default. */ |
d6b0e80f AC |
5465 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5466 | ||
7feb7d06 PA |
5467 | /* Install a SIGCHLD handler. */ |
5468 | sigchld_action.sa_handler = sigchld_handler; | |
5469 | sigemptyset (&sigchld_action.sa_mask); | |
5470 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5471 | |
5472 | /* Make it the default. */ | |
7feb7d06 | 5473 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5474 | |
5475 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5476 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5477 | sigdelset (&suspend_mask, SIGCHLD); | |
5478 | ||
7feb7d06 | 5479 | sigemptyset (&blocked_mask); |
10568435 JK |
5480 | |
5481 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
5482 | &disable_randomization, _("\ | |
5483 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
5484 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
5485 | When this mode is on (which is the default), randomization of the virtual\n\ | |
5486 | address space is disabled. Standalone programs run with the randomization\n\ | |
5487 | enabled by default on some platforms."), | |
5488 | &set_disable_randomization, | |
5489 | &show_disable_randomization, | |
5490 | &setlist, &showlist); | |
d6b0e80f AC |
5491 | } |
5492 | \f | |
5493 | ||
5494 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5495 | the GNU/Linux Threads library and therefore doesn't really belong | |
5496 | here. */ | |
5497 | ||
5498 | /* Read variable NAME in the target and return its value if found. | |
5499 | Otherwise return zero. It is assumed that the type of the variable | |
5500 | is `int'. */ | |
5501 | ||
5502 | static int | |
5503 | get_signo (const char *name) | |
5504 | { | |
5505 | struct minimal_symbol *ms; | |
5506 | int signo; | |
5507 | ||
5508 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5509 | if (ms == NULL) | |
5510 | return 0; | |
5511 | ||
8e70166d | 5512 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5513 | sizeof (signo)) != 0) |
5514 | return 0; | |
5515 | ||
5516 | return signo; | |
5517 | } | |
5518 | ||
5519 | /* Return the set of signals used by the threads library in *SET. */ | |
5520 | ||
5521 | void | |
5522 | lin_thread_get_thread_signals (sigset_t *set) | |
5523 | { | |
5524 | struct sigaction action; | |
5525 | int restart, cancel; | |
5526 | ||
b84876c2 | 5527 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5528 | sigemptyset (set); |
5529 | ||
5530 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5531 | cancel = get_signo ("__pthread_sig_cancel"); |
5532 | ||
5533 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5534 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5535 | not provide any way for the debugger to query the signal numbers - | |
5536 | fortunately they don't change! */ | |
5537 | ||
d6b0e80f | 5538 | if (restart == 0) |
17fbb0bd | 5539 | restart = __SIGRTMIN; |
d6b0e80f | 5540 | |
d6b0e80f | 5541 | if (cancel == 0) |
17fbb0bd | 5542 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5543 | |
5544 | sigaddset (set, restart); | |
5545 | sigaddset (set, cancel); | |
5546 | ||
5547 | /* The GNU/Linux Threads library makes terminating threads send a | |
5548 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
5549 | those (to prevent them from terminating GDB itself, which is | |
5550 | likely to be their default action) and treat them the same way as | |
5551 | SIGCHLD. */ | |
5552 | ||
5553 | action.sa_handler = sigchld_handler; | |
5554 | sigemptyset (&action.sa_mask); | |
58aecb61 | 5555 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
5556 | sigaction (cancel, &action, NULL); |
5557 | ||
5558 | /* We block the "cancel" signal throughout this code ... */ | |
5559 | sigaddset (&blocked_mask, cancel); | |
5560 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
5561 | ||
5562 | /* ... except during a sigsuspend. */ | |
5563 | sigdelset (&suspend_mask, cancel); | |
5564 | } |