Commit | Line | Data |
---|---|---|
3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
7b6bb8da JB |
3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, |
4 | 2011 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 | 40 | #include <sys/param.h> /* for MAXPATHLEN */ |
1777feb0 | 41 | #include <sys/procfs.h> /* for elf_gregset etc. */ |
dba24537 AC |
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 */ | |
1777feb0 | 46 | #include "gdbthread.h" /* for struct thread_info etc. */ |
dba24537 AC |
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 | ||
1777feb0 | 71 | /* This comment documents high-level logic of this file. |
8a77dff3 VP |
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 | ||
1777feb0 | 79 | When waiting for an event in all threads, waitpid is not quite good. Prior to |
8a77dff3 | 80 | version 2.4, Linux can either wait for event in main thread, or in secondary |
1777feb0 | 81 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might |
8a77dff3 VP |
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 | |
1777feb0 | 84 | process, if any. Second, we use non-blocking waitpid with the __WCLONED |
8a77dff3 VP |
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 | |
3e43a32a MS |
89 | an event, we get back to calling nonblocking waitpid with and without |
90 | __WCLONED. | |
8a77dff3 VP |
91 | |
92 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
1777feb0 | 93 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's |
8a77dff3 VP |
94 | blocked, the signal becomes pending and sigsuspend immediately |
95 | notices it and returns. | |
96 | ||
97 | Waiting for events in async mode | |
98 | ================================ | |
99 | ||
7feb7d06 PA |
100 | In async mode, GDB should always be ready to handle both user input |
101 | and target events, so neither blocking waitpid nor sigsuspend are | |
102 | viable options. Instead, we should asynchronously notify the GDB main | |
103 | event loop whenever there's an unprocessed event from the target. We | |
104 | detect asynchronous target events by handling SIGCHLD signals. To | |
105 | notify the event loop about target events, the self-pipe trick is used | |
106 | --- a pipe is registered as waitable event source in the event loop, | |
107 | the event loop select/poll's on the read end of this pipe (as well on | |
108 | other event sources, e.g., stdin), and the SIGCHLD handler writes a | |
109 | byte to this pipe. This is more portable than relying on | |
110 | pselect/ppoll, since on kernels that lack those syscalls, libc | |
111 | emulates them with select/poll+sigprocmask, and that is racy | |
112 | (a.k.a. plain broken). | |
113 | ||
114 | Obviously, if we fail to notify the event loop if there's a target | |
115 | event, it's bad. OTOH, if we notify the event loop when there's no | |
116 | event from the target, linux_nat_wait will detect that there's no real | |
117 | event to report, and return event of type TARGET_WAITKIND_IGNORE. | |
118 | This is mostly harmless, but it will waste time and is better avoided. | |
119 | ||
120 | The main design point is that every time GDB is outside linux-nat.c, | |
121 | we have a SIGCHLD handler installed that is called when something | |
122 | happens to the target and notifies the GDB event loop. Whenever GDB | |
123 | core decides to handle the event, and calls into linux-nat.c, we | |
124 | process things as in sync mode, except that the we never block in | |
125 | sigsuspend. | |
126 | ||
127 | While processing an event, we may end up momentarily blocked in | |
128 | waitpid calls. Those waitpid calls, while blocking, are guarantied to | |
129 | return quickly. E.g., in all-stop mode, before reporting to the core | |
130 | that an LWP hit a breakpoint, all LWPs are stopped by sending them | |
131 | SIGSTOP, and synchronously waiting for the SIGSTOP to be reported. | |
132 | Note that this is different from blocking indefinitely waiting for the | |
133 | next event --- here, we're already handling an event. | |
8a77dff3 VP |
134 | |
135 | Use of signals | |
136 | ============== | |
137 | ||
138 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
139 | signal is not entirely significant; we just need for a signal to be delivered, | |
140 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
141 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
142 | be queued once; we do not keep track of other sources of SIGSTOP. | |
143 | ||
144 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
145 | use them, because they have special behavior when the signal is generated - | |
146 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
147 | kills the entire thread group. | |
148 | ||
149 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
150 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
151 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
152 | ||
153 | We could use a real-time signal instead. This would solve those problems; we | |
154 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
155 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
156 | generates it, and there are races with trying to find a signal that is not | |
157 | blocked. */ | |
a0ef4274 | 158 | |
dba24537 AC |
159 | #ifndef O_LARGEFILE |
160 | #define O_LARGEFILE 0 | |
161 | #endif | |
0274a8ce | 162 | |
3993f6b1 DJ |
163 | /* If the system headers did not provide the constants, hard-code the normal |
164 | values. */ | |
165 | #ifndef PTRACE_EVENT_FORK | |
166 | ||
167 | #define PTRACE_SETOPTIONS 0x4200 | |
168 | #define PTRACE_GETEVENTMSG 0x4201 | |
169 | ||
1777feb0 | 170 | /* Options set using PTRACE_SETOPTIONS. */ |
3993f6b1 DJ |
171 | #define PTRACE_O_TRACESYSGOOD 0x00000001 |
172 | #define PTRACE_O_TRACEFORK 0x00000002 | |
173 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
174 | #define PTRACE_O_TRACECLONE 0x00000008 | |
175 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
9016a515 DJ |
176 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
177 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
3993f6b1 DJ |
178 | |
179 | /* Wait extended result codes for the above trace options. */ | |
180 | #define PTRACE_EVENT_FORK 1 | |
181 | #define PTRACE_EVENT_VFORK 2 | |
182 | #define PTRACE_EVENT_CLONE 3 | |
183 | #define PTRACE_EVENT_EXEC 4 | |
c874c7fc | 184 | #define PTRACE_EVENT_VFORK_DONE 5 |
9016a515 | 185 | #define PTRACE_EVENT_EXIT 6 |
3993f6b1 DJ |
186 | |
187 | #endif /* PTRACE_EVENT_FORK */ | |
188 | ||
ca2163eb PA |
189 | /* Unlike other extended result codes, WSTOPSIG (status) on |
190 | PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but | |
191 | instead SIGTRAP with bit 7 set. */ | |
192 | #define SYSCALL_SIGTRAP (SIGTRAP | 0x80) | |
193 | ||
3993f6b1 DJ |
194 | /* We can't always assume that this flag is available, but all systems |
195 | with the ptrace event handlers also have __WALL, so it's safe to use | |
196 | here. */ | |
197 | #ifndef __WALL | |
198 | #define __WALL 0x40000000 /* Wait for any child. */ | |
199 | #endif | |
200 | ||
02d3ff8c | 201 | #ifndef PTRACE_GETSIGINFO |
1ef18d08 PA |
202 | # define PTRACE_GETSIGINFO 0x4202 |
203 | # define PTRACE_SETSIGINFO 0x4203 | |
02d3ff8c UW |
204 | #endif |
205 | ||
10d6c8cd DJ |
206 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
207 | the use of the multi-threaded target. */ | |
208 | static struct target_ops *linux_ops; | |
f973ed9c | 209 | static struct target_ops linux_ops_saved; |
10d6c8cd | 210 | |
9f0bdab8 DJ |
211 | /* The method to call, if any, when a new thread is attached. */ |
212 | static void (*linux_nat_new_thread) (ptid_t); | |
213 | ||
5b009018 PA |
214 | /* The method to call, if any, when the siginfo object needs to be |
215 | converted between the layout returned by ptrace, and the layout in | |
216 | the architecture of the inferior. */ | |
217 | static int (*linux_nat_siginfo_fixup) (struct siginfo *, | |
218 | gdb_byte *, | |
219 | int); | |
220 | ||
ac264b3b MS |
221 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
222 | Called by our to_xfer_partial. */ | |
223 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
224 | enum target_object, | |
225 | const char *, gdb_byte *, | |
226 | const gdb_byte *, | |
10d6c8cd DJ |
227 | ULONGEST, LONGEST); |
228 | ||
d6b0e80f | 229 | static int debug_linux_nat; |
920d2a44 AC |
230 | static void |
231 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
232 | struct cmd_list_element *c, const char *value) | |
233 | { | |
234 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
235 | value); | |
236 | } | |
d6b0e80f | 237 | |
b84876c2 PA |
238 | static int debug_linux_nat_async = 0; |
239 | static void | |
240 | show_debug_linux_nat_async (struct ui_file *file, int from_tty, | |
241 | struct cmd_list_element *c, const char *value) | |
242 | { | |
3e43a32a MS |
243 | fprintf_filtered (file, |
244 | _("Debugging of GNU/Linux async lwp module is %s.\n"), | |
b84876c2 PA |
245 | value); |
246 | } | |
247 | ||
10568435 JK |
248 | static int disable_randomization = 1; |
249 | ||
250 | static void | |
251 | show_disable_randomization (struct ui_file *file, int from_tty, | |
252 | struct cmd_list_element *c, const char *value) | |
253 | { | |
254 | #ifdef HAVE_PERSONALITY | |
3e43a32a MS |
255 | fprintf_filtered (file, |
256 | _("Disabling randomization of debuggee's " | |
257 | "virtual address space is %s.\n"), | |
10568435 JK |
258 | value); |
259 | #else /* !HAVE_PERSONALITY */ | |
3e43a32a MS |
260 | fputs_filtered (_("Disabling randomization of debuggee's " |
261 | "virtual address space is unsupported on\n" | |
262 | "this platform.\n"), file); | |
10568435 JK |
263 | #endif /* !HAVE_PERSONALITY */ |
264 | } | |
265 | ||
266 | static void | |
3e43a32a MS |
267 | set_disable_randomization (char *args, int from_tty, |
268 | struct cmd_list_element *c) | |
10568435 JK |
269 | { |
270 | #ifndef HAVE_PERSONALITY | |
3e43a32a MS |
271 | error (_("Disabling randomization of debuggee's " |
272 | "virtual address space is unsupported on\n" | |
273 | "this platform.")); | |
10568435 JK |
274 | #endif /* !HAVE_PERSONALITY */ |
275 | } | |
276 | ||
ae087d01 DJ |
277 | struct simple_pid_list |
278 | { | |
279 | int pid; | |
3d799a95 | 280 | int status; |
ae087d01 DJ |
281 | struct simple_pid_list *next; |
282 | }; | |
283 | struct simple_pid_list *stopped_pids; | |
284 | ||
3993f6b1 DJ |
285 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
286 | can not be used, 1 if it can. */ | |
287 | ||
288 | static int linux_supports_tracefork_flag = -1; | |
289 | ||
3e43a32a MS |
290 | /* This variable is a tri-state flag: -1 for unknown, 0 if |
291 | PTRACE_O_TRACESYSGOOD can not be used, 1 if it can. */ | |
a96d9b2e SDJ |
292 | |
293 | static int linux_supports_tracesysgood_flag = -1; | |
294 | ||
9016a515 DJ |
295 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
296 | PTRACE_O_TRACEVFORKDONE. */ | |
297 | ||
298 | static int linux_supports_tracevforkdone_flag = -1; | |
299 | ||
1777feb0 | 300 | /* Async mode support. */ |
b84876c2 | 301 | |
b84876c2 PA |
302 | /* Zero if the async mode, although enabled, is masked, which means |
303 | linux_nat_wait should behave as if async mode was off. */ | |
304 | static int linux_nat_async_mask_value = 1; | |
305 | ||
a96d9b2e SDJ |
306 | /* Stores the current used ptrace() options. */ |
307 | static int current_ptrace_options = 0; | |
308 | ||
b84876c2 PA |
309 | /* The read/write ends of the pipe registered as waitable file in the |
310 | event loop. */ | |
311 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
312 | ||
7feb7d06 | 313 | /* Flush the event pipe. */ |
b84876c2 | 314 | |
7feb7d06 PA |
315 | static void |
316 | async_file_flush (void) | |
b84876c2 | 317 | { |
7feb7d06 PA |
318 | int ret; |
319 | char buf; | |
b84876c2 | 320 | |
7feb7d06 | 321 | do |
b84876c2 | 322 | { |
7feb7d06 | 323 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 324 | } |
7feb7d06 | 325 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
326 | } |
327 | ||
7feb7d06 PA |
328 | /* Put something (anything, doesn't matter what, or how much) in event |
329 | pipe, so that the select/poll in the event-loop realizes we have | |
330 | something to process. */ | |
252fbfc8 | 331 | |
b84876c2 | 332 | static void |
7feb7d06 | 333 | async_file_mark (void) |
b84876c2 | 334 | { |
7feb7d06 | 335 | int ret; |
b84876c2 | 336 | |
7feb7d06 PA |
337 | /* It doesn't really matter what the pipe contains, as long we end |
338 | up with something in it. Might as well flush the previous | |
339 | left-overs. */ | |
340 | async_file_flush (); | |
b84876c2 | 341 | |
7feb7d06 | 342 | do |
b84876c2 | 343 | { |
7feb7d06 | 344 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 345 | } |
7feb7d06 | 346 | while (ret == -1 && errno == EINTR); |
b84876c2 | 347 | |
7feb7d06 PA |
348 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
349 | be awakened anyway. */ | |
b84876c2 PA |
350 | } |
351 | ||
7feb7d06 | 352 | static void linux_nat_async (void (*callback) |
3e43a32a MS |
353 | (enum inferior_event_type event_type, |
354 | void *context), | |
7feb7d06 PA |
355 | void *context); |
356 | static int linux_nat_async_mask (int mask); | |
357 | static int kill_lwp (int lwpid, int signo); | |
358 | ||
359 | static int stop_callback (struct lwp_info *lp, void *data); | |
360 | ||
361 | static void block_child_signals (sigset_t *prev_mask); | |
362 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
2277426b PA |
363 | |
364 | struct lwp_info; | |
365 | static struct lwp_info *add_lwp (ptid_t ptid); | |
366 | static void purge_lwp_list (int pid); | |
367 | static struct lwp_info *find_lwp_pid (ptid_t ptid); | |
368 | ||
ae087d01 DJ |
369 | \f |
370 | /* Trivial list manipulation functions to keep track of a list of | |
371 | new stopped processes. */ | |
372 | static void | |
3d799a95 | 373 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
374 | { |
375 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
e0881a8e | 376 | |
ae087d01 | 377 | new_pid->pid = pid; |
3d799a95 | 378 | new_pid->status = status; |
ae087d01 DJ |
379 | new_pid->next = *listp; |
380 | *listp = new_pid; | |
381 | } | |
382 | ||
383 | static int | |
46a96992 | 384 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) |
ae087d01 DJ |
385 | { |
386 | struct simple_pid_list **p; | |
387 | ||
388 | for (p = listp; *p != NULL; p = &(*p)->next) | |
389 | if ((*p)->pid == pid) | |
390 | { | |
391 | struct simple_pid_list *next = (*p)->next; | |
e0881a8e | 392 | |
46a96992 | 393 | *statusp = (*p)->status; |
ae087d01 DJ |
394 | xfree (*p); |
395 | *p = next; | |
396 | return 1; | |
397 | } | |
398 | return 0; | |
399 | } | |
400 | ||
3d799a95 DJ |
401 | static void |
402 | linux_record_stopped_pid (int pid, int status) | |
ae087d01 | 403 | { |
3d799a95 | 404 | add_to_pid_list (&stopped_pids, pid, status); |
ae087d01 DJ |
405 | } |
406 | ||
3993f6b1 DJ |
407 | \f |
408 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
409 | ||
410 | static void | |
411 | linux_tracefork_child (void) | |
412 | { | |
3993f6b1 DJ |
413 | ptrace (PTRACE_TRACEME, 0, 0, 0); |
414 | kill (getpid (), SIGSTOP); | |
415 | fork (); | |
48bb3cce | 416 | _exit (0); |
3993f6b1 DJ |
417 | } |
418 | ||
7feb7d06 | 419 | /* Wrapper function for waitpid which handles EINTR. */ |
b957e937 DJ |
420 | |
421 | static int | |
46a96992 | 422 | my_waitpid (int pid, int *statusp, int flags) |
b957e937 DJ |
423 | { |
424 | int ret; | |
b84876c2 | 425 | |
b957e937 DJ |
426 | do |
427 | { | |
46a96992 | 428 | ret = waitpid (pid, statusp, flags); |
b957e937 DJ |
429 | } |
430 | while (ret == -1 && errno == EINTR); | |
431 | ||
432 | return ret; | |
433 | } | |
434 | ||
435 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
436 | ||
437 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
438 | we know that the feature is not available. This may change the tracing | |
439 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
440 | ||
441 | However, if it succeeds, we don't know for sure that the feature is | |
442 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 443 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
444 | fork tracing, and let it fork. If the process exits, we assume that we |
445 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
446 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
447 | |
448 | static void | |
b957e937 | 449 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
450 | { |
451 | int child_pid, ret, status; | |
452 | long second_pid; | |
7feb7d06 | 453 | sigset_t prev_mask; |
4c28f408 | 454 | |
7feb7d06 PA |
455 | /* We don't want those ptrace calls to be interrupted. */ |
456 | block_child_signals (&prev_mask); | |
3993f6b1 | 457 | |
b957e937 DJ |
458 | linux_supports_tracefork_flag = 0; |
459 | linux_supports_tracevforkdone_flag = 0; | |
460 | ||
461 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
462 | if (ret != 0) | |
7feb7d06 PA |
463 | { |
464 | restore_child_signals_mask (&prev_mask); | |
465 | return; | |
466 | } | |
b957e937 | 467 | |
3993f6b1 DJ |
468 | child_pid = fork (); |
469 | if (child_pid == -1) | |
e2e0b3e5 | 470 | perror_with_name (("fork")); |
3993f6b1 DJ |
471 | |
472 | if (child_pid == 0) | |
473 | linux_tracefork_child (); | |
474 | ||
b957e937 | 475 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 476 | if (ret == -1) |
e2e0b3e5 | 477 | perror_with_name (("waitpid")); |
3993f6b1 | 478 | else if (ret != child_pid) |
8a3fe4f8 | 479 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 480 | if (! WIFSTOPPED (status)) |
3e43a32a MS |
481 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), |
482 | status); | |
3993f6b1 | 483 | |
3993f6b1 DJ |
484 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
485 | if (ret != 0) | |
486 | { | |
b957e937 DJ |
487 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
488 | if (ret != 0) | |
489 | { | |
8a3fe4f8 | 490 | warning (_("linux_test_for_tracefork: failed to kill child")); |
7feb7d06 | 491 | restore_child_signals_mask (&prev_mask); |
b957e937 DJ |
492 | return; |
493 | } | |
494 | ||
495 | ret = my_waitpid (child_pid, &status, 0); | |
496 | if (ret != child_pid) | |
3e43a32a MS |
497 | warning (_("linux_test_for_tracefork: failed " |
498 | "to wait for killed child")); | |
b957e937 | 499 | else if (!WIFSIGNALED (status)) |
3e43a32a MS |
500 | warning (_("linux_test_for_tracefork: unexpected " |
501 | "wait status 0x%x from killed child"), status); | |
b957e937 | 502 | |
7feb7d06 | 503 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
504 | return; |
505 | } | |
506 | ||
9016a515 DJ |
507 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
508 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
509 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
510 | linux_supports_tracevforkdone_flag = (ret == 0); | |
511 | ||
b957e937 DJ |
512 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
513 | if (ret != 0) | |
8a3fe4f8 | 514 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
515 | |
516 | ret = my_waitpid (child_pid, &status, 0); | |
517 | ||
3993f6b1 DJ |
518 | if (ret == child_pid && WIFSTOPPED (status) |
519 | && status >> 16 == PTRACE_EVENT_FORK) | |
520 | { | |
521 | second_pid = 0; | |
522 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
523 | if (ret == 0 && second_pid != 0) | |
524 | { | |
525 | int second_status; | |
526 | ||
527 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
528 | my_waitpid (second_pid, &second_status, 0); |
529 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
530 | if (ret != 0) | |
3e43a32a MS |
531 | warning (_("linux_test_for_tracefork: " |
532 | "failed to kill second child")); | |
97725dc4 | 533 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
534 | } |
535 | } | |
b957e937 | 536 | else |
8a3fe4f8 AC |
537 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
538 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 539 | |
b957e937 DJ |
540 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
541 | if (ret != 0) | |
8a3fe4f8 | 542 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 543 | my_waitpid (child_pid, &status, 0); |
4c28f408 | 544 | |
7feb7d06 | 545 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
546 | } |
547 | ||
a96d9b2e SDJ |
548 | /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls. |
549 | ||
550 | We try to enable syscall tracing on ORIGINAL_PID. If this fails, | |
551 | we know that the feature is not available. This may change the tracing | |
552 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. */ | |
553 | ||
554 | static void | |
555 | linux_test_for_tracesysgood (int original_pid) | |
556 | { | |
557 | int ret; | |
558 | sigset_t prev_mask; | |
559 | ||
560 | /* We don't want those ptrace calls to be interrupted. */ | |
561 | block_child_signals (&prev_mask); | |
562 | ||
563 | linux_supports_tracesysgood_flag = 0; | |
564 | ||
565 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACESYSGOOD); | |
566 | if (ret != 0) | |
567 | goto out; | |
568 | ||
569 | linux_supports_tracesysgood_flag = 1; | |
570 | out: | |
571 | restore_child_signals_mask (&prev_mask); | |
572 | } | |
573 | ||
574 | /* Determine wether we support PTRACE_O_TRACESYSGOOD option available. | |
575 | This function also sets linux_supports_tracesysgood_flag. */ | |
576 | ||
577 | static int | |
578 | linux_supports_tracesysgood (int pid) | |
579 | { | |
580 | if (linux_supports_tracesysgood_flag == -1) | |
581 | linux_test_for_tracesysgood (pid); | |
582 | return linux_supports_tracesysgood_flag; | |
583 | } | |
584 | ||
3993f6b1 DJ |
585 | /* Return non-zero iff we have tracefork functionality available. |
586 | This function also sets linux_supports_tracefork_flag. */ | |
587 | ||
588 | static int | |
b957e937 | 589 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
590 | { |
591 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 592 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
593 | return linux_supports_tracefork_flag; |
594 | } | |
595 | ||
9016a515 | 596 | static int |
b957e937 | 597 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
598 | { |
599 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 600 | linux_test_for_tracefork (pid); |
9016a515 DJ |
601 | return linux_supports_tracevforkdone_flag; |
602 | } | |
603 | ||
a96d9b2e SDJ |
604 | static void |
605 | linux_enable_tracesysgood (ptid_t ptid) | |
606 | { | |
607 | int pid = ptid_get_lwp (ptid); | |
608 | ||
609 | if (pid == 0) | |
610 | pid = ptid_get_pid (ptid); | |
611 | ||
612 | if (linux_supports_tracesysgood (pid) == 0) | |
613 | return; | |
614 | ||
615 | current_ptrace_options |= PTRACE_O_TRACESYSGOOD; | |
616 | ||
617 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); | |
618 | } | |
619 | ||
3993f6b1 | 620 | \f |
4de4c07c DJ |
621 | void |
622 | linux_enable_event_reporting (ptid_t ptid) | |
623 | { | |
d3587048 | 624 | int pid = ptid_get_lwp (ptid); |
4de4c07c | 625 | |
d3587048 DJ |
626 | if (pid == 0) |
627 | pid = ptid_get_pid (ptid); | |
628 | ||
b957e937 | 629 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
630 | return; |
631 | ||
a96d9b2e SDJ |
632 | current_ptrace_options |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK |
633 | | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE; | |
634 | ||
b957e937 | 635 | if (linux_supports_tracevforkdone (pid)) |
a96d9b2e | 636 | current_ptrace_options |= PTRACE_O_TRACEVFORKDONE; |
9016a515 DJ |
637 | |
638 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
639 | read-only process state. */ | |
4de4c07c | 640 | |
a96d9b2e | 641 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); |
4de4c07c DJ |
642 | } |
643 | ||
6d8fd2b7 UW |
644 | static void |
645 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
646 | { |
647 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
0ec9a092 | 648 | check_for_thread_db (); |
a96d9b2e | 649 | linux_enable_tracesysgood (pid_to_ptid (pid)); |
4de4c07c DJ |
650 | } |
651 | ||
10d6c8cd | 652 | static void |
4de4c07c DJ |
653 | linux_child_post_startup_inferior (ptid_t ptid) |
654 | { | |
655 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 656 | check_for_thread_db (); |
a96d9b2e | 657 | linux_enable_tracesysgood (ptid); |
4de4c07c DJ |
658 | } |
659 | ||
6d8fd2b7 UW |
660 | static int |
661 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 662 | { |
7feb7d06 | 663 | sigset_t prev_mask; |
9016a515 | 664 | int has_vforked; |
4de4c07c DJ |
665 | int parent_pid, child_pid; |
666 | ||
7feb7d06 | 667 | block_child_signals (&prev_mask); |
b84876c2 | 668 | |
e58b0e63 PA |
669 | has_vforked = (inferior_thread ()->pending_follow.kind |
670 | == TARGET_WAITKIND_VFORKED); | |
671 | parent_pid = ptid_get_lwp (inferior_ptid); | |
d3587048 | 672 | if (parent_pid == 0) |
e58b0e63 PA |
673 | parent_pid = ptid_get_pid (inferior_ptid); |
674 | child_pid = PIDGET (inferior_thread ()->pending_follow.value.related_pid); | |
4de4c07c | 675 | |
2277426b PA |
676 | if (!detach_fork) |
677 | linux_enable_event_reporting (pid_to_ptid (child_pid)); | |
678 | ||
6c95b8df PA |
679 | if (has_vforked |
680 | && !non_stop /* Non-stop always resumes both branches. */ | |
681 | && (!target_is_async_p () || sync_execution) | |
682 | && !(follow_child || detach_fork || sched_multi)) | |
683 | { | |
684 | /* The parent stays blocked inside the vfork syscall until the | |
685 | child execs or exits. If we don't let the child run, then | |
686 | the parent stays blocked. If we're telling the parent to run | |
687 | in the foreground, the user will not be able to ctrl-c to get | |
688 | back the terminal, effectively hanging the debug session. */ | |
ac74f770 MS |
689 | fprintf_filtered (gdb_stderr, _("\ |
690 | Can not resume the parent process over vfork in the foreground while\n\ | |
691 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
692 | \"set schedule-multiple\".\n")); | |
693 | /* FIXME output string > 80 columns. */ | |
6c95b8df PA |
694 | return 1; |
695 | } | |
696 | ||
4de4c07c DJ |
697 | if (! follow_child) |
698 | { | |
6c95b8df | 699 | struct lwp_info *child_lp = NULL; |
4de4c07c | 700 | |
1777feb0 | 701 | /* We're already attached to the parent, by default. */ |
4de4c07c | 702 | |
ac264b3b MS |
703 | /* Detach new forked process? */ |
704 | if (detach_fork) | |
f75c00e4 | 705 | { |
6c95b8df PA |
706 | /* Before detaching from the child, remove all breakpoints |
707 | from it. If we forked, then this has already been taken | |
708 | care of by infrun.c. If we vforked however, any | |
709 | breakpoint inserted in the parent is visible in the | |
710 | child, even those added while stopped in a vfork | |
711 | catchpoint. This will remove the breakpoints from the | |
712 | parent also, but they'll be reinserted below. */ | |
713 | if (has_vforked) | |
714 | { | |
715 | /* keep breakpoints list in sync. */ | |
716 | remove_breakpoints_pid (GET_PID (inferior_ptid)); | |
717 | } | |
718 | ||
e85a822c | 719 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
720 | { |
721 | target_terminal_ours (); | |
722 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
723 | "Detaching after fork from " |
724 | "child process %d.\n", | |
ac264b3b MS |
725 | child_pid); |
726 | } | |
4de4c07c | 727 | |
ac264b3b MS |
728 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
729 | } | |
730 | else | |
731 | { | |
77435e4c | 732 | struct inferior *parent_inf, *child_inf; |
2277426b | 733 | struct cleanup *old_chain; |
7f9f62ba PA |
734 | |
735 | /* Add process to GDB's tables. */ | |
77435e4c PA |
736 | child_inf = add_inferior (child_pid); |
737 | ||
e58b0e63 | 738 | parent_inf = current_inferior (); |
77435e4c | 739 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 740 | copy_terminal_info (child_inf, parent_inf); |
7f9f62ba | 741 | |
2277426b | 742 | old_chain = save_inferior_ptid (); |
6c95b8df | 743 | save_current_program_space (); |
2277426b PA |
744 | |
745 | inferior_ptid = ptid_build (child_pid, child_pid, 0); | |
746 | add_thread (inferior_ptid); | |
6c95b8df PA |
747 | child_lp = add_lwp (inferior_ptid); |
748 | child_lp->stopped = 1; | |
749 | child_lp->resumed = 1; | |
2277426b | 750 | |
6c95b8df PA |
751 | /* If this is a vfork child, then the address-space is |
752 | shared with the parent. */ | |
753 | if (has_vforked) | |
754 | { | |
755 | child_inf->pspace = parent_inf->pspace; | |
756 | child_inf->aspace = parent_inf->aspace; | |
757 | ||
758 | /* The parent will be frozen until the child is done | |
759 | with the shared region. Keep track of the | |
760 | parent. */ | |
761 | child_inf->vfork_parent = parent_inf; | |
762 | child_inf->pending_detach = 0; | |
763 | parent_inf->vfork_child = child_inf; | |
764 | parent_inf->pending_detach = 0; | |
765 | } | |
766 | else | |
767 | { | |
768 | child_inf->aspace = new_address_space (); | |
769 | child_inf->pspace = add_program_space (child_inf->aspace); | |
770 | child_inf->removable = 1; | |
771 | set_current_program_space (child_inf->pspace); | |
772 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
773 | ||
774 | /* Let the shared library layer (solib-svr4) learn about | |
775 | this new process, relocate the cloned exec, pull in | |
776 | shared libraries, and install the solib event | |
777 | breakpoint. If a "cloned-VM" event was propagated | |
778 | better throughout the core, this wouldn't be | |
779 | required. */ | |
268a4a75 | 780 | solib_create_inferior_hook (0); |
6c95b8df PA |
781 | } |
782 | ||
783 | /* Let the thread_db layer learn about this new process. */ | |
2277426b PA |
784 | check_for_thread_db (); |
785 | ||
786 | do_cleanups (old_chain); | |
ac264b3b | 787 | } |
9016a515 DJ |
788 | |
789 | if (has_vforked) | |
790 | { | |
6c95b8df PA |
791 | struct lwp_info *lp; |
792 | struct inferior *parent_inf; | |
793 | ||
794 | parent_inf = current_inferior (); | |
795 | ||
796 | /* If we detached from the child, then we have to be careful | |
797 | to not insert breakpoints in the parent until the child | |
798 | is done with the shared memory region. However, if we're | |
799 | staying attached to the child, then we can and should | |
800 | insert breakpoints, so that we can debug it. A | |
801 | subsequent child exec or exit is enough to know when does | |
802 | the child stops using the parent's address space. */ | |
803 | parent_inf->waiting_for_vfork_done = detach_fork; | |
56710373 | 804 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
6c95b8df PA |
805 | |
806 | lp = find_lwp_pid (pid_to_ptid (parent_pid)); | |
b957e937 DJ |
807 | gdb_assert (linux_supports_tracefork_flag >= 0); |
808 | if (linux_supports_tracevforkdone (0)) | |
9016a515 | 809 | { |
6c95b8df PA |
810 | if (debug_linux_nat) |
811 | fprintf_unfiltered (gdb_stdlog, | |
812 | "LCFF: waiting for VFORK_DONE on %d\n", | |
813 | parent_pid); | |
814 | ||
815 | lp->stopped = 1; | |
816 | lp->resumed = 1; | |
9016a515 | 817 | |
6c95b8df PA |
818 | /* We'll handle the VFORK_DONE event like any other |
819 | event, in target_wait. */ | |
9016a515 DJ |
820 | } |
821 | else | |
822 | { | |
823 | /* We can't insert breakpoints until the child has | |
824 | finished with the shared memory region. We need to | |
825 | wait until that happens. Ideal would be to just | |
826 | call: | |
827 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
828 | - waitpid (parent_pid, &status, __WALL); | |
829 | However, most architectures can't handle a syscall | |
830 | being traced on the way out if it wasn't traced on | |
831 | the way in. | |
832 | ||
833 | We might also think to loop, continuing the child | |
834 | until it exits or gets a SIGTRAP. One problem is | |
835 | that the child might call ptrace with PTRACE_TRACEME. | |
836 | ||
837 | There's no simple and reliable way to figure out when | |
838 | the vforked child will be done with its copy of the | |
839 | shared memory. We could step it out of the syscall, | |
840 | two instructions, let it go, and then single-step the | |
841 | parent once. When we have hardware single-step, this | |
842 | would work; with software single-step it could still | |
843 | be made to work but we'd have to be able to insert | |
844 | single-step breakpoints in the child, and we'd have | |
845 | to insert -just- the single-step breakpoint in the | |
846 | parent. Very awkward. | |
847 | ||
848 | In the end, the best we can do is to make sure it | |
849 | runs for a little while. Hopefully it will be out of | |
850 | range of any breakpoints we reinsert. Usually this | |
851 | is only the single-step breakpoint at vfork's return | |
852 | point. */ | |
853 | ||
6c95b8df PA |
854 | if (debug_linux_nat) |
855 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
856 | "LCFF: no VFORK_DONE " |
857 | "support, sleeping a bit\n"); | |
6c95b8df | 858 | |
9016a515 | 859 | usleep (10000); |
9016a515 | 860 | |
6c95b8df PA |
861 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
862 | and leave it pending. The next linux_nat_resume call | |
863 | will notice a pending event, and bypasses actually | |
864 | resuming the inferior. */ | |
865 | lp->status = 0; | |
866 | lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
867 | lp->stopped = 0; | |
868 | lp->resumed = 1; | |
869 | ||
870 | /* If we're in async mode, need to tell the event loop | |
871 | there's something here to process. */ | |
872 | if (target_can_async_p ()) | |
873 | async_file_mark (); | |
874 | } | |
9016a515 | 875 | } |
4de4c07c | 876 | } |
3993f6b1 | 877 | else |
4de4c07c | 878 | { |
77435e4c | 879 | struct inferior *parent_inf, *child_inf; |
2277426b | 880 | struct lwp_info *lp; |
6c95b8df | 881 | struct program_space *parent_pspace; |
4de4c07c | 882 | |
e85a822c | 883 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
884 | { |
885 | target_terminal_ours (); | |
6c95b8df | 886 | if (has_vforked) |
3e43a32a MS |
887 | fprintf_filtered (gdb_stdlog, |
888 | _("Attaching after process %d " | |
889 | "vfork to child process %d.\n"), | |
6c95b8df PA |
890 | parent_pid, child_pid); |
891 | else | |
3e43a32a MS |
892 | fprintf_filtered (gdb_stdlog, |
893 | _("Attaching after process %d " | |
894 | "fork to child process %d.\n"), | |
6c95b8df | 895 | parent_pid, child_pid); |
f75c00e4 | 896 | } |
4de4c07c | 897 | |
7a7d3353 PA |
898 | /* Add the new inferior first, so that the target_detach below |
899 | doesn't unpush the target. */ | |
900 | ||
77435e4c PA |
901 | child_inf = add_inferior (child_pid); |
902 | ||
e58b0e63 | 903 | parent_inf = current_inferior (); |
77435e4c | 904 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 905 | copy_terminal_info (child_inf, parent_inf); |
7a7d3353 | 906 | |
6c95b8df | 907 | parent_pspace = parent_inf->pspace; |
9016a515 | 908 | |
6c95b8df PA |
909 | /* If we're vforking, we want to hold on to the parent until the |
910 | child exits or execs. At child exec or exit time we can | |
911 | remove the old breakpoints from the parent and detach or | |
912 | resume debugging it. Otherwise, detach the parent now; we'll | |
913 | want to reuse it's program/address spaces, but we can't set | |
914 | them to the child before removing breakpoints from the | |
915 | parent, otherwise, the breakpoints module could decide to | |
916 | remove breakpoints from the wrong process (since they'd be | |
917 | assigned to the same address space). */ | |
9016a515 DJ |
918 | |
919 | if (has_vforked) | |
7f9f62ba | 920 | { |
6c95b8df PA |
921 | gdb_assert (child_inf->vfork_parent == NULL); |
922 | gdb_assert (parent_inf->vfork_child == NULL); | |
923 | child_inf->vfork_parent = parent_inf; | |
924 | child_inf->pending_detach = 0; | |
925 | parent_inf->vfork_child = child_inf; | |
926 | parent_inf->pending_detach = detach_fork; | |
927 | parent_inf->waiting_for_vfork_done = 0; | |
ac264b3b | 928 | } |
2277426b | 929 | else if (detach_fork) |
b84876c2 | 930 | target_detach (NULL, 0); |
4de4c07c | 931 | |
6c95b8df PA |
932 | /* Note that the detach above makes PARENT_INF dangling. */ |
933 | ||
934 | /* Add the child thread to the appropriate lists, and switch to | |
935 | this new thread, before cloning the program space, and | |
936 | informing the solib layer about this new process. */ | |
937 | ||
9f0bdab8 | 938 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
2277426b PA |
939 | add_thread (inferior_ptid); |
940 | lp = add_lwp (inferior_ptid); | |
941 | lp->stopped = 1; | |
6c95b8df PA |
942 | lp->resumed = 1; |
943 | ||
944 | /* If this is a vfork child, then the address-space is shared | |
945 | with the parent. If we detached from the parent, then we can | |
946 | reuse the parent's program/address spaces. */ | |
947 | if (has_vforked || detach_fork) | |
948 | { | |
949 | child_inf->pspace = parent_pspace; | |
950 | child_inf->aspace = child_inf->pspace->aspace; | |
951 | } | |
952 | else | |
953 | { | |
954 | child_inf->aspace = new_address_space (); | |
955 | child_inf->pspace = add_program_space (child_inf->aspace); | |
956 | child_inf->removable = 1; | |
957 | set_current_program_space (child_inf->pspace); | |
958 | clone_program_space (child_inf->pspace, parent_pspace); | |
959 | ||
960 | /* Let the shared library layer (solib-svr4) learn about | |
961 | this new process, relocate the cloned exec, pull in | |
962 | shared libraries, and install the solib event breakpoint. | |
963 | If a "cloned-VM" event was propagated better throughout | |
964 | the core, this wouldn't be required. */ | |
268a4a75 | 965 | solib_create_inferior_hook (0); |
6c95b8df | 966 | } |
ac264b3b | 967 | |
6c95b8df | 968 | /* Let the thread_db layer learn about this new process. */ |
ef29ce1a | 969 | check_for_thread_db (); |
4de4c07c DJ |
970 | } |
971 | ||
7feb7d06 | 972 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
973 | return 0; |
974 | } | |
975 | ||
4de4c07c | 976 | \f |
77b06cd7 | 977 | static int |
6d8fd2b7 | 978 | linux_child_insert_fork_catchpoint (int pid) |
4de4c07c | 979 | { |
77b06cd7 | 980 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
981 | } |
982 | ||
77b06cd7 | 983 | static int |
6d8fd2b7 | 984 | linux_child_insert_vfork_catchpoint (int pid) |
3993f6b1 | 985 | { |
77b06cd7 | 986 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
987 | } |
988 | ||
77b06cd7 | 989 | static int |
6d8fd2b7 | 990 | linux_child_insert_exec_catchpoint (int pid) |
3993f6b1 | 991 | { |
77b06cd7 | 992 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
993 | } |
994 | ||
a96d9b2e SDJ |
995 | static int |
996 | linux_child_set_syscall_catchpoint (int pid, int needed, int any_count, | |
997 | int table_size, int *table) | |
998 | { | |
77b06cd7 TJB |
999 | if (!linux_supports_tracesysgood (pid)) |
1000 | return 1; | |
1001 | ||
a96d9b2e SDJ |
1002 | /* On GNU/Linux, we ignore the arguments. It means that we only |
1003 | enable the syscall catchpoints, but do not disable them. | |
77b06cd7 | 1004 | |
a96d9b2e SDJ |
1005 | Also, we do not use the `table' information because we do not |
1006 | filter system calls here. We let GDB do the logic for us. */ | |
1007 | return 0; | |
1008 | } | |
1009 | ||
d6b0e80f AC |
1010 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
1011 | are processes sharing the same VM space. A multi-threaded process | |
1012 | is basically a group of such processes. However, such a grouping | |
1013 | is almost entirely a user-space issue; the kernel doesn't enforce | |
1014 | such a grouping at all (this might change in the future). In | |
1015 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
1016 | Threads library) to provide such a grouping. | |
1017 | ||
1018 | It is perfectly well possible to write a multi-threaded application | |
1019 | without the assistance of a threads library, by using the clone | |
1020 | system call directly. This module should be able to give some | |
1021 | rudimentary support for debugging such applications if developers | |
1022 | specify the CLONE_PTRACE flag in the clone system call, and are | |
1023 | using the Linux kernel 2.4 or above. | |
1024 | ||
1025 | Note that there are some peculiarities in GNU/Linux that affect | |
1026 | this code: | |
1027 | ||
1028 | - In general one should specify the __WCLONE flag to waitpid in | |
1029 | order to make it report events for any of the cloned processes | |
1030 | (and leave it out for the initial process). However, if a cloned | |
1031 | process has exited the exit status is only reported if the | |
1032 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
1033 | we cannot use it since GDB must work on older systems too. | |
1034 | ||
1035 | - When a traced, cloned process exits and is waited for by the | |
1036 | debugger, the kernel reassigns it to the original parent and | |
1037 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
1038 | library doesn't notice this, which leads to the "zombie problem": | |
1039 | When debugged a multi-threaded process that spawns a lot of | |
1040 | threads will run out of processes, even if the threads exit, | |
1041 | because the "zombies" stay around. */ | |
1042 | ||
1043 | /* List of known LWPs. */ | |
9f0bdab8 | 1044 | struct lwp_info *lwp_list; |
d6b0e80f AC |
1045 | \f |
1046 | ||
d6b0e80f AC |
1047 | /* Original signal mask. */ |
1048 | static sigset_t normal_mask; | |
1049 | ||
1050 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
1051 | _initialize_linux_nat. */ | |
1052 | static sigset_t suspend_mask; | |
1053 | ||
7feb7d06 PA |
1054 | /* Signals to block to make that sigsuspend work. */ |
1055 | static sigset_t blocked_mask; | |
1056 | ||
1057 | /* SIGCHLD action. */ | |
1058 | struct sigaction sigchld_action; | |
b84876c2 | 1059 | |
7feb7d06 PA |
1060 | /* Block child signals (SIGCHLD and linux threads signals), and store |
1061 | the previous mask in PREV_MASK. */ | |
84e46146 | 1062 | |
7feb7d06 PA |
1063 | static void |
1064 | block_child_signals (sigset_t *prev_mask) | |
1065 | { | |
1066 | /* Make sure SIGCHLD is blocked. */ | |
1067 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
1068 | sigaddset (&blocked_mask, SIGCHLD); | |
1069 | ||
1070 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
1071 | } | |
1072 | ||
1073 | /* Restore child signals mask, previously returned by | |
1074 | block_child_signals. */ | |
1075 | ||
1076 | static void | |
1077 | restore_child_signals_mask (sigset_t *prev_mask) | |
1078 | { | |
1079 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
1080 | } | |
d6b0e80f AC |
1081 | \f |
1082 | ||
1083 | /* Prototypes for local functions. */ | |
1084 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 1085 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 1086 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd | 1087 | |
d6b0e80f AC |
1088 | \f |
1089 | /* Convert wait status STATUS to a string. Used for printing debug | |
1090 | messages only. */ | |
1091 | ||
1092 | static char * | |
1093 | status_to_str (int status) | |
1094 | { | |
1095 | static char buf[64]; | |
1096 | ||
1097 | if (WIFSTOPPED (status)) | |
206aa767 | 1098 | { |
ca2163eb | 1099 | if (WSTOPSIG (status) == SYSCALL_SIGTRAP) |
206aa767 DE |
1100 | snprintf (buf, sizeof (buf), "%s (stopped at syscall)", |
1101 | strsignal (SIGTRAP)); | |
1102 | else | |
1103 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
1104 | strsignal (WSTOPSIG (status))); | |
1105 | } | |
d6b0e80f AC |
1106 | else if (WIFSIGNALED (status)) |
1107 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
ba9b2ec3 | 1108 | strsignal (WTERMSIG (status))); |
d6b0e80f AC |
1109 | else |
1110 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
1111 | ||
1112 | return buf; | |
1113 | } | |
1114 | ||
d90e17a7 PA |
1115 | /* Remove all LWPs belong to PID from the lwp list. */ |
1116 | ||
1117 | static void | |
1118 | purge_lwp_list (int pid) | |
1119 | { | |
1120 | struct lwp_info *lp, *lpprev, *lpnext; | |
1121 | ||
1122 | lpprev = NULL; | |
1123 | ||
1124 | for (lp = lwp_list; lp; lp = lpnext) | |
1125 | { | |
1126 | lpnext = lp->next; | |
1127 | ||
1128 | if (ptid_get_pid (lp->ptid) == pid) | |
1129 | { | |
1130 | if (lp == lwp_list) | |
1131 | lwp_list = lp->next; | |
1132 | else | |
1133 | lpprev->next = lp->next; | |
1134 | ||
1135 | xfree (lp); | |
1136 | } | |
1137 | else | |
1138 | lpprev = lp; | |
1139 | } | |
1140 | } | |
1141 | ||
1142 | /* Return the number of known LWPs in the tgid given by PID. */ | |
1143 | ||
1144 | static int | |
1145 | num_lwps (int pid) | |
1146 | { | |
1147 | int count = 0; | |
1148 | struct lwp_info *lp; | |
1149 | ||
1150 | for (lp = lwp_list; lp; lp = lp->next) | |
1151 | if (ptid_get_pid (lp->ptid) == pid) | |
1152 | count++; | |
1153 | ||
1154 | return count; | |
d6b0e80f AC |
1155 | } |
1156 | ||
f973ed9c | 1157 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1158 | structure describing the new LWP. The LWP should already be stopped |
1159 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1160 | |
1161 | static struct lwp_info * | |
1162 | add_lwp (ptid_t ptid) | |
1163 | { | |
1164 | struct lwp_info *lp; | |
1165 | ||
1166 | gdb_assert (is_lwp (ptid)); | |
1167 | ||
1168 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1169 | ||
1170 | memset (lp, 0, sizeof (struct lwp_info)); | |
1171 | ||
1172 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1173 | ||
1174 | lp->ptid = ptid; | |
dc146f7c | 1175 | lp->core = -1; |
d6b0e80f AC |
1176 | |
1177 | lp->next = lwp_list; | |
1178 | lwp_list = lp; | |
d6b0e80f | 1179 | |
d90e17a7 | 1180 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1181 | linux_nat_new_thread (ptid); |
1182 | ||
d6b0e80f AC |
1183 | return lp; |
1184 | } | |
1185 | ||
1186 | /* Remove the LWP specified by PID from the list. */ | |
1187 | ||
1188 | static void | |
1189 | delete_lwp (ptid_t ptid) | |
1190 | { | |
1191 | struct lwp_info *lp, *lpprev; | |
1192 | ||
1193 | lpprev = NULL; | |
1194 | ||
1195 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1196 | if (ptid_equal (lp->ptid, ptid)) | |
1197 | break; | |
1198 | ||
1199 | if (!lp) | |
1200 | return; | |
1201 | ||
d6b0e80f AC |
1202 | if (lpprev) |
1203 | lpprev->next = lp->next; | |
1204 | else | |
1205 | lwp_list = lp->next; | |
1206 | ||
1207 | xfree (lp); | |
1208 | } | |
1209 | ||
1210 | /* Return a pointer to the structure describing the LWP corresponding | |
1211 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1212 | ||
1213 | static struct lwp_info * | |
1214 | find_lwp_pid (ptid_t ptid) | |
1215 | { | |
1216 | struct lwp_info *lp; | |
1217 | int lwp; | |
1218 | ||
1219 | if (is_lwp (ptid)) | |
1220 | lwp = GET_LWP (ptid); | |
1221 | else | |
1222 | lwp = GET_PID (ptid); | |
1223 | ||
1224 | for (lp = lwp_list; lp; lp = lp->next) | |
1225 | if (lwp == GET_LWP (lp->ptid)) | |
1226 | return lp; | |
1227 | ||
1228 | return NULL; | |
1229 | } | |
1230 | ||
1231 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
1232 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1233 | pointer to the structure describing that LWP immediately. | |
1234 | Otherwise return NULL. */ | |
1235 | ||
1236 | struct lwp_info * | |
d90e17a7 PA |
1237 | iterate_over_lwps (ptid_t filter, |
1238 | int (*callback) (struct lwp_info *, void *), | |
1239 | void *data) | |
d6b0e80f AC |
1240 | { |
1241 | struct lwp_info *lp, *lpnext; | |
1242 | ||
1243 | for (lp = lwp_list; lp; lp = lpnext) | |
1244 | { | |
1245 | lpnext = lp->next; | |
d90e17a7 PA |
1246 | |
1247 | if (ptid_match (lp->ptid, filter)) | |
1248 | { | |
1249 | if ((*callback) (lp, data)) | |
1250 | return lp; | |
1251 | } | |
d6b0e80f AC |
1252 | } |
1253 | ||
1254 | return NULL; | |
1255 | } | |
1256 | ||
2277426b PA |
1257 | /* Update our internal state when changing from one checkpoint to |
1258 | another indicated by NEW_PTID. We can only switch single-threaded | |
1259 | applications, so we only create one new LWP, and the previous list | |
1260 | is discarded. */ | |
f973ed9c DJ |
1261 | |
1262 | void | |
1263 | linux_nat_switch_fork (ptid_t new_ptid) | |
1264 | { | |
1265 | struct lwp_info *lp; | |
1266 | ||
2277426b PA |
1267 | purge_lwp_list (GET_PID (inferior_ptid)); |
1268 | ||
f973ed9c DJ |
1269 | lp = add_lwp (new_ptid); |
1270 | lp->stopped = 1; | |
e26af52f | 1271 | |
2277426b PA |
1272 | /* This changes the thread's ptid while preserving the gdb thread |
1273 | num. Also changes the inferior pid, while preserving the | |
1274 | inferior num. */ | |
1275 | thread_change_ptid (inferior_ptid, new_ptid); | |
1276 | ||
1277 | /* We've just told GDB core that the thread changed target id, but, | |
1278 | in fact, it really is a different thread, with different register | |
1279 | contents. */ | |
1280 | registers_changed (); | |
e26af52f DJ |
1281 | } |
1282 | ||
e26af52f DJ |
1283 | /* Handle the exit of a single thread LP. */ |
1284 | ||
1285 | static void | |
1286 | exit_lwp (struct lwp_info *lp) | |
1287 | { | |
e09875d4 | 1288 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1289 | |
1290 | if (th) | |
e26af52f | 1291 | { |
17faa917 DJ |
1292 | if (print_thread_events) |
1293 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1294 | ||
4f8d22e3 | 1295 | delete_thread (lp->ptid); |
e26af52f DJ |
1296 | } |
1297 | ||
1298 | delete_lwp (lp->ptid); | |
1299 | } | |
1300 | ||
4d062f1a PA |
1301 | /* Return an lwp's tgid, found in `/proc/PID/status'. */ |
1302 | ||
1303 | int | |
1304 | linux_proc_get_tgid (int lwpid) | |
1305 | { | |
1306 | FILE *status_file; | |
1307 | char buf[100]; | |
1308 | int tgid = -1; | |
1309 | ||
1310 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); | |
1311 | status_file = fopen (buf, "r"); | |
1312 | if (status_file != NULL) | |
1313 | { | |
1314 | while (fgets (buf, sizeof (buf), status_file)) | |
1315 | { | |
1316 | if (strncmp (buf, "Tgid:", 5) == 0) | |
1317 | { | |
1318 | tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10); | |
1319 | break; | |
1320 | } | |
1321 | } | |
1322 | ||
1323 | fclose (status_file); | |
1324 | } | |
1325 | ||
1326 | return tgid; | |
1327 | } | |
1328 | ||
a0ef4274 DJ |
1329 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1330 | Other states including `T (tracing stop)' are reported as false. */ | |
1331 | ||
1332 | static int | |
1333 | pid_is_stopped (pid_t pid) | |
1334 | { | |
1335 | FILE *status_file; | |
1336 | char buf[100]; | |
1337 | int retval = 0; | |
1338 | ||
1339 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1340 | status_file = fopen (buf, "r"); | |
1341 | if (status_file != NULL) | |
1342 | { | |
1343 | int have_state = 0; | |
1344 | ||
1345 | while (fgets (buf, sizeof (buf), status_file)) | |
1346 | { | |
1347 | if (strncmp (buf, "State:", 6) == 0) | |
1348 | { | |
1349 | have_state = 1; | |
1350 | break; | |
1351 | } | |
1352 | } | |
1353 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1354 | retval = 1; | |
1355 | fclose (status_file); | |
1356 | } | |
1357 | return retval; | |
1358 | } | |
1359 | ||
1360 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1361 | Returns a wait status for that LWP, to cache. */ | |
1362 | ||
1363 | static int | |
1364 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1365 | int *signalled) | |
1366 | { | |
1367 | pid_t new_pid, pid = GET_LWP (ptid); | |
1368 | int status; | |
1369 | ||
1370 | if (pid_is_stopped (pid)) | |
1371 | { | |
1372 | if (debug_linux_nat) | |
1373 | fprintf_unfiltered (gdb_stdlog, | |
1374 | "LNPAW: Attaching to a stopped process\n"); | |
1375 | ||
1376 | /* The process is definitely stopped. It is in a job control | |
1377 | stop, unless the kernel predates the TASK_STOPPED / | |
1378 | TASK_TRACED distinction, in which case it might be in a | |
1379 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1380 | can kill it, signal it, et cetera. | |
1381 | ||
1382 | First make sure there is a pending SIGSTOP. Since we are | |
1383 | already attached, the process can not transition from stopped | |
1384 | to running without a PTRACE_CONT; so we know this signal will | |
1385 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1386 | probably already in the queue (unless this kernel is old | |
1387 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1388 | is not an RT signal, it can only be queued once. */ | |
1389 | kill_lwp (pid, SIGSTOP); | |
1390 | ||
1391 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1392 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1393 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1394 | } | |
1395 | ||
1396 | /* Make sure the initial process is stopped. The user-level threads | |
1397 | layer might want to poke around in the inferior, and that won't | |
1398 | work if things haven't stabilized yet. */ | |
1399 | new_pid = my_waitpid (pid, &status, 0); | |
1400 | if (new_pid == -1 && errno == ECHILD) | |
1401 | { | |
1402 | if (first) | |
1403 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1404 | ||
1405 | /* Try again with __WCLONE to check cloned processes. */ | |
1406 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1407 | *cloned = 1; | |
1408 | } | |
1409 | ||
dacc9cb2 PP |
1410 | gdb_assert (pid == new_pid); |
1411 | ||
1412 | if (!WIFSTOPPED (status)) | |
1413 | { | |
1414 | /* The pid we tried to attach has apparently just exited. */ | |
1415 | if (debug_linux_nat) | |
1416 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1417 | pid, status_to_str (status)); | |
1418 | return status; | |
1419 | } | |
a0ef4274 DJ |
1420 | |
1421 | if (WSTOPSIG (status) != SIGSTOP) | |
1422 | { | |
1423 | *signalled = 1; | |
1424 | if (debug_linux_nat) | |
1425 | fprintf_unfiltered (gdb_stdlog, | |
1426 | "LNPAW: Received %s after attaching\n", | |
1427 | status_to_str (status)); | |
1428 | } | |
1429 | ||
1430 | return status; | |
1431 | } | |
1432 | ||
1433 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1434 | if the new LWP could not be attached. */ | |
d6b0e80f | 1435 | |
9ee57c33 | 1436 | int |
93815fbf | 1437 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1438 | { |
9ee57c33 | 1439 | struct lwp_info *lp; |
7feb7d06 | 1440 | sigset_t prev_mask; |
d6b0e80f AC |
1441 | |
1442 | gdb_assert (is_lwp (ptid)); | |
1443 | ||
7feb7d06 | 1444 | block_child_signals (&prev_mask); |
d6b0e80f | 1445 | |
9ee57c33 | 1446 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1447 | |
1448 | /* We assume that we're already attached to any LWP that has an id | |
1449 | equal to the overall process id, and to any LWP that is already | |
1450 | in our list of LWPs. If we're not seeing exit events from threads | |
1451 | and we've had PID wraparound since we last tried to stop all threads, | |
1452 | this assumption might be wrong; fortunately, this is very unlikely | |
1453 | to happen. */ | |
9ee57c33 | 1454 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1455 | { |
a0ef4274 | 1456 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1457 | |
1458 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1459 | { |
1460 | /* If we fail to attach to the thread, issue a warning, | |
1461 | but continue. One way this can happen is if thread | |
e9efe249 | 1462 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1463 | bug may place threads in the thread list and then fail |
1464 | to create them. */ | |
1465 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1466 | safe_strerror (errno)); | |
7feb7d06 | 1467 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1468 | return -1; |
1469 | } | |
1470 | ||
d6b0e80f AC |
1471 | if (debug_linux_nat) |
1472 | fprintf_unfiltered (gdb_stdlog, | |
1473 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1474 | target_pid_to_str (ptid)); | |
1475 | ||
a0ef4274 | 1476 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
dacc9cb2 PP |
1477 | if (!WIFSTOPPED (status)) |
1478 | return -1; | |
1479 | ||
a0ef4274 DJ |
1480 | lp = add_lwp (ptid); |
1481 | lp->stopped = 1; | |
1482 | lp->cloned = cloned; | |
1483 | lp->signalled = signalled; | |
1484 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1485 | { |
a0ef4274 DJ |
1486 | lp->resumed = 1; |
1487 | lp->status = status; | |
d6b0e80f AC |
1488 | } |
1489 | ||
a0ef4274 | 1490 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1491 | |
1492 | if (debug_linux_nat) | |
1493 | { | |
1494 | fprintf_unfiltered (gdb_stdlog, | |
1495 | "LLAL: waitpid %s received %s\n", | |
1496 | target_pid_to_str (ptid), | |
1497 | status_to_str (status)); | |
1498 | } | |
1499 | } | |
1500 | else | |
1501 | { | |
1502 | /* We assume that the LWP representing the original process is | |
1503 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1504 | that the GNU/linux ptrace layer uses to keep track of |
1505 | threads. Note that this won't have already been done since | |
1506 | the main thread will have, we assume, been stopped by an | |
1507 | attach from a different layer. */ | |
9ee57c33 DJ |
1508 | if (lp == NULL) |
1509 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1510 | lp->stopped = 1; |
1511 | } | |
9ee57c33 | 1512 | |
7feb7d06 | 1513 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1514 | return 0; |
d6b0e80f AC |
1515 | } |
1516 | ||
b84876c2 | 1517 | static void |
136d6dae VP |
1518 | linux_nat_create_inferior (struct target_ops *ops, |
1519 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1520 | int from_tty) |
1521 | { | |
10568435 JK |
1522 | #ifdef HAVE_PERSONALITY |
1523 | int personality_orig = 0, personality_set = 0; | |
1524 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1525 | |
1526 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1527 | we have to mask the async mode. */ | |
1528 | ||
10568435 JK |
1529 | #ifdef HAVE_PERSONALITY |
1530 | if (disable_randomization) | |
1531 | { | |
1532 | errno = 0; | |
1533 | personality_orig = personality (0xffffffff); | |
1534 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1535 | { | |
1536 | personality_set = 1; | |
1537 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1538 | } | |
1539 | if (errno != 0 || (personality_set | |
1540 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1541 | warning (_("Error disabling address space randomization: %s"), | |
1542 | safe_strerror (errno)); | |
1543 | } | |
1544 | #endif /* HAVE_PERSONALITY */ | |
1545 | ||
136d6dae | 1546 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1547 | |
10568435 JK |
1548 | #ifdef HAVE_PERSONALITY |
1549 | if (personality_set) | |
1550 | { | |
1551 | errno = 0; | |
1552 | personality (personality_orig); | |
1553 | if (errno != 0) | |
1554 | warning (_("Error restoring address space randomization: %s"), | |
1555 | safe_strerror (errno)); | |
1556 | } | |
1557 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1558 | } |
1559 | ||
d6b0e80f | 1560 | static void |
136d6dae | 1561 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1562 | { |
1563 | struct lwp_info *lp; | |
d6b0e80f | 1564 | int status; |
af990527 | 1565 | ptid_t ptid; |
d6b0e80f | 1566 | |
136d6dae | 1567 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1568 | |
af990527 PA |
1569 | /* The ptrace base target adds the main thread with (pid,0,0) |
1570 | format. Decorate it with lwp info. */ | |
1571 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1572 | thread_change_ptid (inferior_ptid, ptid); | |
1573 | ||
9f0bdab8 | 1574 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1575 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1576 | |
1577 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1578 | &lp->signalled); | |
dacc9cb2 PP |
1579 | if (!WIFSTOPPED (status)) |
1580 | { | |
1581 | if (WIFEXITED (status)) | |
1582 | { | |
1583 | int exit_code = WEXITSTATUS (status); | |
1584 | ||
1585 | target_terminal_ours (); | |
1586 | target_mourn_inferior (); | |
1587 | if (exit_code == 0) | |
1588 | error (_("Unable to attach: program exited normally.")); | |
1589 | else | |
1590 | error (_("Unable to attach: program exited with code %d."), | |
1591 | exit_code); | |
1592 | } | |
1593 | else if (WIFSIGNALED (status)) | |
1594 | { | |
1595 | enum target_signal signo; | |
1596 | ||
1597 | target_terminal_ours (); | |
1598 | target_mourn_inferior (); | |
1599 | ||
1600 | signo = target_signal_from_host (WTERMSIG (status)); | |
1601 | error (_("Unable to attach: program terminated with signal " | |
1602 | "%s, %s."), | |
1603 | target_signal_to_name (signo), | |
1604 | target_signal_to_string (signo)); | |
1605 | } | |
1606 | ||
1607 | internal_error (__FILE__, __LINE__, | |
1608 | _("unexpected status %d for PID %ld"), | |
1609 | status, (long) GET_LWP (ptid)); | |
1610 | } | |
1611 | ||
a0ef4274 | 1612 | lp->stopped = 1; |
9f0bdab8 | 1613 | |
a0ef4274 | 1614 | /* Save the wait status to report later. */ |
d6b0e80f | 1615 | lp->resumed = 1; |
a0ef4274 DJ |
1616 | if (debug_linux_nat) |
1617 | fprintf_unfiltered (gdb_stdlog, | |
1618 | "LNA: waitpid %ld, saving status %s\n", | |
1619 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1620 | |
7feb7d06 PA |
1621 | lp->status = status; |
1622 | ||
1623 | if (target_can_async_p ()) | |
1624 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1625 | } |
1626 | ||
a0ef4274 DJ |
1627 | /* Get pending status of LP. */ |
1628 | static int | |
1629 | get_pending_status (struct lwp_info *lp, int *status) | |
1630 | { | |
ca2163eb PA |
1631 | enum target_signal signo = TARGET_SIGNAL_0; |
1632 | ||
1633 | /* If we paused threads momentarily, we may have stored pending | |
1634 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1635 | and GDB core hasn't seen any signal for those threads. | |
1636 | Otherwise, the last signal reported to the core is found in the | |
1637 | thread object's stop_signal. | |
1638 | ||
1639 | There's a corner case that isn't handled here at present. Only | |
1640 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1641 | stop_signal make sense as a real signal to pass to the inferior. | |
1642 | Some catchpoint related events, like | |
1643 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
1644 | to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But, | |
1645 | those traps are debug API (ptrace in our case) related and | |
1646 | induced; the inferior wouldn't see them if it wasn't being | |
1647 | traced. Hence, we should never pass them to the inferior, even | |
1648 | when set to pass state. Since this corner case isn't handled by | |
1649 | infrun.c when proceeding with a signal, for consistency, neither | |
1650 | do we handle it here (or elsewhere in the file we check for | |
1651 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1652 | this is really a corner case. */ | |
1653 | ||
1654 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
1655 | signo = TARGET_SIGNAL_0; /* a pending ptrace event, not a real signal. */ | |
1656 | else if (lp->status) | |
1657 | signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1658 | else if (non_stop && !is_executing (lp->ptid)) | |
1659 | { | |
1660 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
e0881a8e | 1661 | |
16c381f0 | 1662 | signo = tp->suspend.stop_signal; |
ca2163eb PA |
1663 | } |
1664 | else if (!non_stop) | |
a0ef4274 | 1665 | { |
ca2163eb PA |
1666 | struct target_waitstatus last; |
1667 | ptid_t last_ptid; | |
4c28f408 | 1668 | |
ca2163eb | 1669 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1670 | |
ca2163eb PA |
1671 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) |
1672 | { | |
e09875d4 | 1673 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
e0881a8e | 1674 | |
16c381f0 | 1675 | signo = tp->suspend.stop_signal; |
4c28f408 | 1676 | } |
ca2163eb | 1677 | } |
4c28f408 | 1678 | |
ca2163eb | 1679 | *status = 0; |
4c28f408 | 1680 | |
ca2163eb PA |
1681 | if (signo == TARGET_SIGNAL_0) |
1682 | { | |
1683 | if (debug_linux_nat) | |
1684 | fprintf_unfiltered (gdb_stdlog, | |
1685 | "GPT: lwp %s has no pending signal\n", | |
1686 | target_pid_to_str (lp->ptid)); | |
1687 | } | |
1688 | else if (!signal_pass_state (signo)) | |
1689 | { | |
1690 | if (debug_linux_nat) | |
3e43a32a MS |
1691 | fprintf_unfiltered (gdb_stdlog, |
1692 | "GPT: lwp %s had signal %s, " | |
1693 | "but it is in no pass state\n", | |
ca2163eb PA |
1694 | target_pid_to_str (lp->ptid), |
1695 | target_signal_to_string (signo)); | |
a0ef4274 | 1696 | } |
a0ef4274 | 1697 | else |
4c28f408 | 1698 | { |
ca2163eb PA |
1699 | *status = W_STOPCODE (target_signal_to_host (signo)); |
1700 | ||
1701 | if (debug_linux_nat) | |
1702 | fprintf_unfiltered (gdb_stdlog, | |
1703 | "GPT: lwp %s has pending signal %s\n", | |
1704 | target_pid_to_str (lp->ptid), | |
1705 | target_signal_to_string (signo)); | |
4c28f408 | 1706 | } |
a0ef4274 DJ |
1707 | |
1708 | return 0; | |
1709 | } | |
1710 | ||
d6b0e80f AC |
1711 | static int |
1712 | detach_callback (struct lwp_info *lp, void *data) | |
1713 | { | |
1714 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1715 | ||
1716 | if (debug_linux_nat && lp->status) | |
1717 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1718 | strsignal (WSTOPSIG (lp->status)), | |
1719 | target_pid_to_str (lp->ptid)); | |
1720 | ||
a0ef4274 DJ |
1721 | /* If there is a pending SIGSTOP, get rid of it. */ |
1722 | if (lp->signalled) | |
d6b0e80f | 1723 | { |
d6b0e80f AC |
1724 | if (debug_linux_nat) |
1725 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1726 | "DC: Sending SIGCONT to %s\n", |
1727 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1728 | |
a0ef4274 | 1729 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1730 | lp->signalled = 0; |
d6b0e80f AC |
1731 | } |
1732 | ||
1733 | /* We don't actually detach from the LWP that has an id equal to the | |
1734 | overall process id just yet. */ | |
1735 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1736 | { | |
a0ef4274 DJ |
1737 | int status = 0; |
1738 | ||
1739 | /* Pass on any pending signal for this LWP. */ | |
1740 | get_pending_status (lp, &status); | |
1741 | ||
d6b0e80f AC |
1742 | errno = 0; |
1743 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1744 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1745 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1746 | safe_strerror (errno)); |
1747 | ||
1748 | if (debug_linux_nat) | |
1749 | fprintf_unfiltered (gdb_stdlog, | |
1750 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1751 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1752 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1753 | |
1754 | delete_lwp (lp->ptid); | |
1755 | } | |
1756 | ||
1757 | return 0; | |
1758 | } | |
1759 | ||
1760 | static void | |
136d6dae | 1761 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1762 | { |
b84876c2 | 1763 | int pid; |
a0ef4274 | 1764 | int status; |
d90e17a7 PA |
1765 | struct lwp_info *main_lwp; |
1766 | ||
1767 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1768 | |
b84876c2 PA |
1769 | if (target_can_async_p ()) |
1770 | linux_nat_async (NULL, 0); | |
1771 | ||
4c28f408 PA |
1772 | /* Stop all threads before detaching. ptrace requires that the |
1773 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1774 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1775 | /* ... and wait until all of them have reported back that |
1776 | they're no longer running. */ | |
d90e17a7 | 1777 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1778 | |
d90e17a7 | 1779 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1780 | |
1781 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1782 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1783 | ||
1784 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1785 | |
a0ef4274 DJ |
1786 | /* Pass on any pending signal for the last LWP. */ |
1787 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1788 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1789 | && WIFSTOPPED (status)) |
1790 | { | |
1791 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1792 | pass it along with PTRACE_DETACH. */ | |
1793 | args = alloca (8); | |
1794 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
ddabfc73 TT |
1795 | if (debug_linux_nat) |
1796 | fprintf_unfiltered (gdb_stdlog, | |
1797 | "LND: Sending signal %s to %s\n", | |
1798 | args, | |
1799 | target_pid_to_str (main_lwp->ptid)); | |
a0ef4274 DJ |
1800 | } |
1801 | ||
d90e17a7 | 1802 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1803 | |
7a7d3353 PA |
1804 | if (forks_exist_p ()) |
1805 | { | |
1806 | /* Multi-fork case. The current inferior_ptid is being detached | |
1807 | from, but there are other viable forks to debug. Detach from | |
1808 | the current fork, and context-switch to the first | |
1809 | available. */ | |
1810 | linux_fork_detach (args, from_tty); | |
1811 | ||
1812 | if (non_stop && target_can_async_p ()) | |
1813 | target_async (inferior_event_handler, 0); | |
1814 | } | |
1815 | else | |
1816 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1817 | } |
1818 | ||
1819 | /* Resume LP. */ | |
1820 | ||
1821 | static int | |
1822 | resume_callback (struct lwp_info *lp, void *data) | |
1823 | { | |
6c95b8df PA |
1824 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
1825 | ||
1826 | if (lp->stopped && inf->vfork_child != NULL) | |
1827 | { | |
1828 | if (debug_linux_nat) | |
1829 | fprintf_unfiltered (gdb_stdlog, | |
1830 | "RC: Not resuming %s (vfork parent)\n", | |
1831 | target_pid_to_str (lp->ptid)); | |
1832 | } | |
1833 | else if (lp->stopped && lp->status == 0) | |
d6b0e80f | 1834 | { |
d90e17a7 PA |
1835 | if (debug_linux_nat) |
1836 | fprintf_unfiltered (gdb_stdlog, | |
a289b8f6 | 1837 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", |
d90e17a7 PA |
1838 | target_pid_to_str (lp->ptid)); |
1839 | ||
28439f5e PA |
1840 | linux_ops->to_resume (linux_ops, |
1841 | pid_to_ptid (GET_LWP (lp->ptid)), | |
a289b8f6 | 1842 | 0, TARGET_SIGNAL_0); |
d6b0e80f AC |
1843 | if (debug_linux_nat) |
1844 | fprintf_unfiltered (gdb_stdlog, | |
a289b8f6 | 1845 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", |
d6b0e80f AC |
1846 | target_pid_to_str (lp->ptid)); |
1847 | lp->stopped = 0; | |
a289b8f6 | 1848 | lp->step = 0; |
9f0bdab8 | 1849 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 1850 | lp->stopped_by_watchpoint = 0; |
d6b0e80f | 1851 | } |
57380f4e | 1852 | else if (lp->stopped && debug_linux_nat) |
3e43a32a MS |
1853 | fprintf_unfiltered (gdb_stdlog, |
1854 | "RC: Not resuming sibling %s (has pending)\n", | |
57380f4e DJ |
1855 | target_pid_to_str (lp->ptid)); |
1856 | else if (debug_linux_nat) | |
3e43a32a MS |
1857 | fprintf_unfiltered (gdb_stdlog, |
1858 | "RC: Not resuming sibling %s (not stopped)\n", | |
57380f4e | 1859 | target_pid_to_str (lp->ptid)); |
d6b0e80f AC |
1860 | |
1861 | return 0; | |
1862 | } | |
1863 | ||
1864 | static int | |
1865 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1866 | { | |
1867 | lp->resumed = 0; | |
1868 | return 0; | |
1869 | } | |
1870 | ||
1871 | static int | |
1872 | resume_set_callback (struct lwp_info *lp, void *data) | |
1873 | { | |
1874 | lp->resumed = 1; | |
1875 | return 0; | |
1876 | } | |
1877 | ||
1878 | static void | |
28439f5e PA |
1879 | linux_nat_resume (struct target_ops *ops, |
1880 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1881 | { |
7feb7d06 | 1882 | sigset_t prev_mask; |
d6b0e80f | 1883 | struct lwp_info *lp; |
d90e17a7 | 1884 | int resume_many; |
d6b0e80f | 1885 | |
76f50ad1 DJ |
1886 | if (debug_linux_nat) |
1887 | fprintf_unfiltered (gdb_stdlog, | |
1888 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1889 | step ? "step" : "resume", | |
1890 | target_pid_to_str (ptid), | |
423ec54c JK |
1891 | (signo != TARGET_SIGNAL_0 |
1892 | ? strsignal (target_signal_to_host (signo)) : "0"), | |
76f50ad1 DJ |
1893 | target_pid_to_str (inferior_ptid)); |
1894 | ||
7feb7d06 | 1895 | block_child_signals (&prev_mask); |
b84876c2 | 1896 | |
d6b0e80f | 1897 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1898 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1899 | || ptid_is_pid (ptid)); | |
4c28f408 | 1900 | |
e3e9f5a2 PA |
1901 | /* Mark the lwps we're resuming as resumed. */ |
1902 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
d6b0e80f | 1903 | |
d90e17a7 PA |
1904 | /* See if it's the current inferior that should be handled |
1905 | specially. */ | |
1906 | if (resume_many) | |
1907 | lp = find_lwp_pid (inferior_ptid); | |
1908 | else | |
1909 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1910 | gdb_assert (lp != NULL); |
d6b0e80f | 1911 | |
9f0bdab8 DJ |
1912 | /* Remember if we're stepping. */ |
1913 | lp->step = step; | |
d6b0e80f | 1914 | |
9f0bdab8 DJ |
1915 | /* If we have a pending wait status for this thread, there is no |
1916 | point in resuming the process. But first make sure that | |
1917 | linux_nat_wait won't preemptively handle the event - we | |
1918 | should never take this short-circuit if we are going to | |
1919 | leave LP running, since we have skipped resuming all the | |
1920 | other threads. This bit of code needs to be synchronized | |
1921 | with linux_nat_wait. */ | |
76f50ad1 | 1922 | |
9f0bdab8 DJ |
1923 | if (lp->status && WIFSTOPPED (lp->status)) |
1924 | { | |
423ec54c | 1925 | enum target_signal saved_signo; |
d6b48e9c | 1926 | struct inferior *inf; |
76f50ad1 | 1927 | |
d90e17a7 | 1928 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); |
d6b48e9c PA |
1929 | gdb_assert (inf); |
1930 | saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1931 | ||
1932 | /* Defer to common code if we're gaining control of the | |
1933 | inferior. */ | |
16c381f0 | 1934 | if (inf->control.stop_soon == NO_STOP_QUIETLY |
d6b48e9c | 1935 | && signal_stop_state (saved_signo) == 0 |
9f0bdab8 DJ |
1936 | && signal_print_state (saved_signo) == 0 |
1937 | && signal_pass_state (saved_signo) == 1) | |
d6b0e80f | 1938 | { |
9f0bdab8 DJ |
1939 | if (debug_linux_nat) |
1940 | fprintf_unfiltered (gdb_stdlog, | |
1941 | "LLR: Not short circuiting for ignored " | |
1942 | "status 0x%x\n", lp->status); | |
1943 | ||
d6b0e80f AC |
1944 | /* FIXME: What should we do if we are supposed to continue |
1945 | this thread with a signal? */ | |
1946 | gdb_assert (signo == TARGET_SIGNAL_0); | |
9f0bdab8 DJ |
1947 | signo = saved_signo; |
1948 | lp->status = 0; | |
1949 | } | |
1950 | } | |
76f50ad1 | 1951 | |
6c95b8df | 1952 | if (lp->status || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
9f0bdab8 DJ |
1953 | { |
1954 | /* FIXME: What should we do if we are supposed to continue | |
1955 | this thread with a signal? */ | |
1956 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1957 | |
9f0bdab8 DJ |
1958 | if (debug_linux_nat) |
1959 | fprintf_unfiltered (gdb_stdlog, | |
1960 | "LLR: Short circuiting for status 0x%x\n", | |
1961 | lp->status); | |
d6b0e80f | 1962 | |
7feb7d06 PA |
1963 | restore_child_signals_mask (&prev_mask); |
1964 | if (target_can_async_p ()) | |
1965 | { | |
1966 | target_async (inferior_event_handler, 0); | |
1967 | /* Tell the event loop we have something to process. */ | |
1968 | async_file_mark (); | |
1969 | } | |
9f0bdab8 | 1970 | return; |
d6b0e80f AC |
1971 | } |
1972 | ||
9f0bdab8 DJ |
1973 | /* Mark LWP as not stopped to prevent it from being continued by |
1974 | resume_callback. */ | |
1975 | lp->stopped = 0; | |
1976 | ||
d90e17a7 PA |
1977 | if (resume_many) |
1978 | iterate_over_lwps (ptid, resume_callback, NULL); | |
1979 | ||
1980 | /* Convert to something the lower layer understands. */ | |
1981 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 1982 | |
28439f5e | 1983 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 | 1984 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 1985 | lp->stopped_by_watchpoint = 0; |
9f0bdab8 | 1986 | |
d6b0e80f AC |
1987 | if (debug_linux_nat) |
1988 | fprintf_unfiltered (gdb_stdlog, | |
1989 | "LLR: %s %s, %s (resume event thread)\n", | |
1990 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1991 | target_pid_to_str (ptid), | |
423ec54c JK |
1992 | (signo != TARGET_SIGNAL_0 |
1993 | ? strsignal (target_signal_to_host (signo)) : "0")); | |
b84876c2 | 1994 | |
7feb7d06 | 1995 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 1996 | if (target_can_async_p ()) |
8ea051c5 | 1997 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1998 | } |
1999 | ||
c5f62d5f | 2000 | /* Send a signal to an LWP. */ |
d6b0e80f AC |
2001 | |
2002 | static int | |
2003 | kill_lwp (int lwpid, int signo) | |
2004 | { | |
c5f62d5f DE |
2005 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2006 | fails, then we are not using nptl threads and we should be using kill. */ | |
d6b0e80f AC |
2007 | |
2008 | #ifdef HAVE_TKILL_SYSCALL | |
c5f62d5f DE |
2009 | { |
2010 | static int tkill_failed; | |
2011 | ||
2012 | if (!tkill_failed) | |
2013 | { | |
2014 | int ret; | |
2015 | ||
2016 | errno = 0; | |
2017 | ret = syscall (__NR_tkill, lwpid, signo); | |
2018 | if (errno != ENOSYS) | |
2019 | return ret; | |
2020 | tkill_failed = 1; | |
2021 | } | |
2022 | } | |
d6b0e80f AC |
2023 | #endif |
2024 | ||
2025 | return kill (lwpid, signo); | |
2026 | } | |
2027 | ||
ca2163eb PA |
2028 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
2029 | event, check if the core is interested in it: if not, ignore the | |
2030 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
2031 | syscall entry/exit status, since the ptrace event itself doesn't | |
2032 | indicate it, and report the trap to higher layers. */ | |
2033 | ||
2034 | static int | |
2035 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
2036 | { | |
2037 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2038 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
2039 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2040 | ||
2041 | if (stopping) | |
2042 | { | |
2043 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
2044 | makes it so that the LWP reports an immediate syscall return, | |
2045 | followed by the SIGSTOP. Skip seeing that "return" using | |
2046 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
2047 | SIGSTOP. Later when the thread is resumed, a new syscall | |
2048 | entry event. If we didn't do this (and returned 0), we'd | |
2049 | leave a syscall entry pending, and our caller, by using | |
2050 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
2051 | itself. Later, when the user re-resumes this LWP, we'd see | |
2052 | another syscall entry event and we'd mistake it for a return. | |
2053 | ||
2054 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
2055 | (leaving immediately with LWP->signalled set, without issuing | |
2056 | a PTRACE_CONT), it would still be problematic to leave this | |
2057 | syscall enter pending, as later when the thread is resumed, | |
2058 | it would then see the same syscall exit mentioned above, | |
2059 | followed by the delayed SIGSTOP, while the syscall didn't | |
2060 | actually get to execute. It seems it would be even more | |
2061 | confusing to the user. */ | |
2062 | ||
2063 | if (debug_linux_nat) | |
2064 | fprintf_unfiltered (gdb_stdlog, | |
2065 | "LHST: ignoring syscall %d " | |
2066 | "for LWP %ld (stopping threads), " | |
2067 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
2068 | syscall_number, | |
2069 | GET_LWP (lp->ptid)); | |
2070 | ||
2071 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2072 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2073 | return 1; | |
2074 | } | |
2075 | ||
2076 | if (catch_syscall_enabled ()) | |
2077 | { | |
2078 | /* Always update the entry/return state, even if this particular | |
2079 | syscall isn't interesting to the core now. In async mode, | |
2080 | the user could install a new catchpoint for this syscall | |
2081 | between syscall enter/return, and we'll need to know to | |
2082 | report a syscall return if that happens. */ | |
2083 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2084 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2085 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2086 | ||
2087 | if (catching_syscall_number (syscall_number)) | |
2088 | { | |
2089 | /* Alright, an event to report. */ | |
2090 | ourstatus->kind = lp->syscall_state; | |
2091 | ourstatus->value.syscall_number = syscall_number; | |
2092 | ||
2093 | if (debug_linux_nat) | |
2094 | fprintf_unfiltered (gdb_stdlog, | |
2095 | "LHST: stopping for %s of syscall %d" | |
2096 | " for LWP %ld\n", | |
3e43a32a MS |
2097 | lp->syscall_state |
2098 | == TARGET_WAITKIND_SYSCALL_ENTRY | |
ca2163eb PA |
2099 | ? "entry" : "return", |
2100 | syscall_number, | |
2101 | GET_LWP (lp->ptid)); | |
2102 | return 0; | |
2103 | } | |
2104 | ||
2105 | if (debug_linux_nat) | |
2106 | fprintf_unfiltered (gdb_stdlog, | |
2107 | "LHST: ignoring %s of syscall %d " | |
2108 | "for LWP %ld\n", | |
2109 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2110 | ? "entry" : "return", | |
2111 | syscall_number, | |
2112 | GET_LWP (lp->ptid)); | |
2113 | } | |
2114 | else | |
2115 | { | |
2116 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
2117 | before on this LWP, it could happen that the user removes all | |
2118 | syscall catchpoints before we get to process this event. | |
2119 | There are two noteworthy issues here: | |
2120 | ||
2121 | - When stopped at a syscall entry event, resuming with | |
2122 | PT_STEP still resumes executing the syscall and reports a | |
2123 | syscall return. | |
2124 | ||
2125 | - Only PT_SYSCALL catches syscall enters. If we last | |
2126 | single-stepped this thread, then this event can't be a | |
2127 | syscall enter. If we last single-stepped this thread, this | |
2128 | has to be a syscall exit. | |
2129 | ||
2130 | The points above mean that the next resume, be it PT_STEP or | |
2131 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
2132 | if (debug_linux_nat) | |
2133 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2134 | "LHST: caught syscall event " |
2135 | "with no syscall catchpoints." | |
ca2163eb PA |
2136 | " %d for LWP %ld, ignoring\n", |
2137 | syscall_number, | |
2138 | GET_LWP (lp->ptid)); | |
2139 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2140 | } | |
2141 | ||
2142 | /* The core isn't interested in this event. For efficiency, avoid | |
2143 | stopping all threads only to have the core resume them all again. | |
2144 | Since we're not stopping threads, if we're still syscall tracing | |
2145 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
2146 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
2147 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
2148 | ||
2149 | /* Note that gdbarch_get_syscall_number may access registers, hence | |
2150 | fill a regcache. */ | |
2151 | registers_changed (); | |
2152 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
2153 | lp->step, TARGET_SIGNAL_0); | |
2154 | return 1; | |
2155 | } | |
2156 | ||
3d799a95 DJ |
2157 | /* Handle a GNU/Linux extended wait response. If we see a clone |
2158 | event, we need to add the new LWP to our list (and not report the | |
2159 | trap to higher layers). This function returns non-zero if the | |
2160 | event should be ignored and we should wait again. If STOPPING is | |
2161 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
2162 | |
2163 | static int | |
3d799a95 DJ |
2164 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
2165 | int stopping) | |
d6b0e80f | 2166 | { |
3d799a95 DJ |
2167 | int pid = GET_LWP (lp->ptid); |
2168 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
3d799a95 | 2169 | int event = status >> 16; |
d6b0e80f | 2170 | |
3d799a95 DJ |
2171 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
2172 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 2173 | { |
3d799a95 DJ |
2174 | unsigned long new_pid; |
2175 | int ret; | |
2176 | ||
2177 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 2178 | |
3d799a95 DJ |
2179 | /* If we haven't already seen the new PID stop, wait for it now. */ |
2180 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
2181 | { | |
2182 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
2183 | hits the SIGSTOP, but we're already attached. */ | |
2184 | ret = my_waitpid (new_pid, &status, | |
2185 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
2186 | if (ret == -1) | |
2187 | perror_with_name (_("waiting for new child")); | |
2188 | else if (ret != new_pid) | |
2189 | internal_error (__FILE__, __LINE__, | |
2190 | _("wait returned unexpected PID %d"), ret); | |
2191 | else if (!WIFSTOPPED (status)) | |
2192 | internal_error (__FILE__, __LINE__, | |
2193 | _("wait returned unexpected status 0x%x"), status); | |
2194 | } | |
2195 | ||
3a3e9ee3 | 2196 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2197 | |
2277426b PA |
2198 | if (event == PTRACE_EVENT_FORK |
2199 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
2200 | { | |
2201 | struct fork_info *fp; | |
2202 | ||
2203 | /* Handle checkpointing by linux-fork.c here as a special | |
2204 | case. We don't want the follow-fork-mode or 'catch fork' | |
2205 | to interfere with this. */ | |
2206 | ||
2207 | /* This won't actually modify the breakpoint list, but will | |
2208 | physically remove the breakpoints from the child. */ | |
2209 | detach_breakpoints (new_pid); | |
2210 | ||
2211 | /* Retain child fork in ptrace (stopped) state. */ | |
2212 | fp = find_fork_pid (new_pid); | |
2213 | if (!fp) | |
2214 | fp = add_fork (new_pid); | |
2215 | ||
2216 | /* Report as spurious, so that infrun doesn't want to follow | |
2217 | this fork. We're actually doing an infcall in | |
2218 | linux-fork.c. */ | |
2219 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2220 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
2221 | ||
2222 | /* Report the stop to the core. */ | |
2223 | return 0; | |
2224 | } | |
2225 | ||
3d799a95 DJ |
2226 | if (event == PTRACE_EVENT_FORK) |
2227 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2228 | else if (event == PTRACE_EVENT_VFORK) | |
2229 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 2230 | else |
3d799a95 | 2231 | { |
78768c4a JK |
2232 | struct lwp_info *new_lp; |
2233 | ||
3d799a95 | 2234 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
78768c4a | 2235 | |
d90e17a7 | 2236 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 2237 | new_lp->cloned = 1; |
4c28f408 | 2238 | new_lp->stopped = 1; |
d6b0e80f | 2239 | |
3d799a95 DJ |
2240 | if (WSTOPSIG (status) != SIGSTOP) |
2241 | { | |
2242 | /* This can happen if someone starts sending signals to | |
2243 | the new thread before it gets a chance to run, which | |
2244 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2245 | This is an unlikely case, and harder to handle for | |
2246 | fork / vfork than for clone, so we do not try - but | |
2247 | we handle it for clone events here. We'll send | |
2248 | the other signal on to the thread below. */ | |
2249 | ||
2250 | new_lp->signalled = 1; | |
2251 | } | |
2252 | else | |
2253 | status = 0; | |
d6b0e80f | 2254 | |
4c28f408 | 2255 | if (non_stop) |
3d799a95 | 2256 | { |
4c28f408 PA |
2257 | /* Add the new thread to GDB's lists as soon as possible |
2258 | so that: | |
2259 | ||
2260 | 1) the frontend doesn't have to wait for a stop to | |
2261 | display them, and, | |
2262 | ||
2263 | 2) we tag it with the correct running state. */ | |
2264 | ||
2265 | /* If the thread_db layer is active, let it know about | |
2266 | this new thread, and add it to GDB's list. */ | |
2267 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2268 | { | |
2269 | /* We're not using thread_db. Add it to GDB's | |
2270 | list. */ | |
2271 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2272 | add_thread (new_lp->ptid); | |
2273 | } | |
2274 | ||
2275 | if (!stopping) | |
2276 | { | |
2277 | set_running (new_lp->ptid, 1); | |
2278 | set_executing (new_lp->ptid, 1); | |
2279 | } | |
2280 | } | |
2281 | ||
ca2163eb PA |
2282 | /* Note the need to use the low target ops to resume, to |
2283 | handle resuming with PT_SYSCALL if we have syscall | |
2284 | catchpoints. */ | |
4c28f408 PA |
2285 | if (!stopping) |
2286 | { | |
423ec54c | 2287 | enum target_signal signo; |
ca2163eb | 2288 | |
4c28f408 | 2289 | new_lp->stopped = 0; |
3d799a95 | 2290 | new_lp->resumed = 1; |
ca2163eb PA |
2291 | |
2292 | signo = (status | |
2293 | ? target_signal_from_host (WSTOPSIG (status)) | |
2294 | : TARGET_SIGNAL_0); | |
2295 | ||
2296 | linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid), | |
2297 | 0, signo); | |
3d799a95 | 2298 | } |
ad34eb2f JK |
2299 | else |
2300 | { | |
2301 | if (status != 0) | |
2302 | { | |
2303 | /* We created NEW_LP so it cannot yet contain STATUS. */ | |
2304 | gdb_assert (new_lp->status == 0); | |
2305 | ||
2306 | /* Save the wait status to report later. */ | |
2307 | if (debug_linux_nat) | |
2308 | fprintf_unfiltered (gdb_stdlog, | |
2309 | "LHEW: waitpid of new LWP %ld, " | |
2310 | "saving status %s\n", | |
2311 | (long) GET_LWP (new_lp->ptid), | |
2312 | status_to_str (status)); | |
2313 | new_lp->status = status; | |
2314 | } | |
2315 | } | |
d6b0e80f | 2316 | |
3d799a95 DJ |
2317 | if (debug_linux_nat) |
2318 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2319 | "LHEW: Got clone event " |
2320 | "from LWP %ld, resuming\n", | |
3d799a95 | 2321 | GET_LWP (lp->ptid)); |
ca2163eb PA |
2322 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
2323 | 0, TARGET_SIGNAL_0); | |
3d799a95 DJ |
2324 | |
2325 | return 1; | |
2326 | } | |
2327 | ||
2328 | return 0; | |
d6b0e80f AC |
2329 | } |
2330 | ||
3d799a95 DJ |
2331 | if (event == PTRACE_EVENT_EXEC) |
2332 | { | |
a75724bc PA |
2333 | if (debug_linux_nat) |
2334 | fprintf_unfiltered (gdb_stdlog, | |
2335 | "LHEW: Got exec event from LWP %ld\n", | |
2336 | GET_LWP (lp->ptid)); | |
2337 | ||
3d799a95 DJ |
2338 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2339 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2340 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 | 2341 | |
6c95b8df PA |
2342 | return 0; |
2343 | } | |
2344 | ||
2345 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2346 | { | |
2347 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2348 | { |
6c95b8df | 2349 | if (debug_linux_nat) |
3e43a32a MS |
2350 | fprintf_unfiltered (gdb_stdlog, |
2351 | "LHEW: Got expected PTRACE_EVENT_" | |
2352 | "VFORK_DONE from LWP %ld: stopping\n", | |
6c95b8df | 2353 | GET_LWP (lp->ptid)); |
3d799a95 | 2354 | |
6c95b8df PA |
2355 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2356 | return 0; | |
3d799a95 DJ |
2357 | } |
2358 | ||
6c95b8df | 2359 | if (debug_linux_nat) |
3e43a32a MS |
2360 | fprintf_unfiltered (gdb_stdlog, |
2361 | "LHEW: Got PTRACE_EVENT_VFORK_DONE " | |
2362 | "from LWP %ld: resuming\n", | |
6c95b8df PA |
2363 | GET_LWP (lp->ptid)); |
2364 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2365 | return 1; | |
3d799a95 DJ |
2366 | } |
2367 | ||
2368 | internal_error (__FILE__, __LINE__, | |
2369 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2370 | } |
2371 | ||
2372 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
2373 | exited. */ | |
2374 | ||
2375 | static int | |
2376 | wait_lwp (struct lwp_info *lp) | |
2377 | { | |
2378 | pid_t pid; | |
2379 | int status; | |
2380 | int thread_dead = 0; | |
2381 | ||
2382 | gdb_assert (!lp->stopped); | |
2383 | gdb_assert (lp->status == 0); | |
2384 | ||
58aecb61 | 2385 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
2386 | if (pid == -1 && errno == ECHILD) |
2387 | { | |
58aecb61 | 2388 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
2389 | if (pid == -1 && errno == ECHILD) |
2390 | { | |
2391 | /* The thread has previously exited. We need to delete it | |
2392 | now because, for some vendor 2.4 kernels with NPTL | |
2393 | support backported, there won't be an exit event unless | |
2394 | it is the main thread. 2.6 kernels will report an exit | |
2395 | event for each thread that exits, as expected. */ | |
2396 | thread_dead = 1; | |
2397 | if (debug_linux_nat) | |
2398 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2399 | target_pid_to_str (lp->ptid)); | |
2400 | } | |
2401 | } | |
2402 | ||
2403 | if (!thread_dead) | |
2404 | { | |
2405 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2406 | ||
2407 | if (debug_linux_nat) | |
2408 | { | |
2409 | fprintf_unfiltered (gdb_stdlog, | |
2410 | "WL: waitpid %s received %s\n", | |
2411 | target_pid_to_str (lp->ptid), | |
2412 | status_to_str (status)); | |
2413 | } | |
2414 | } | |
2415 | ||
2416 | /* Check if the thread has exited. */ | |
2417 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2418 | { | |
2419 | thread_dead = 1; | |
2420 | if (debug_linux_nat) | |
2421 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2422 | target_pid_to_str (lp->ptid)); | |
2423 | } | |
2424 | ||
2425 | if (thread_dead) | |
2426 | { | |
e26af52f | 2427 | exit_lwp (lp); |
d6b0e80f AC |
2428 | return 0; |
2429 | } | |
2430 | ||
2431 | gdb_assert (WIFSTOPPED (status)); | |
2432 | ||
ca2163eb PA |
2433 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2434 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2435 | { | |
2436 | /* No longer need the sysgood bit. The ptrace event ends up | |
2437 | recorded in lp->waitstatus if we care for it. We can carry | |
2438 | on handling the event like a regular SIGTRAP from here | |
2439 | on. */ | |
2440 | status = W_STOPCODE (SIGTRAP); | |
2441 | if (linux_handle_syscall_trap (lp, 1)) | |
2442 | return wait_lwp (lp); | |
2443 | } | |
2444 | ||
d6b0e80f AC |
2445 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
2446 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2447 | { | |
2448 | if (debug_linux_nat) | |
2449 | fprintf_unfiltered (gdb_stdlog, | |
2450 | "WL: Handling extended status 0x%06x\n", | |
2451 | status); | |
3d799a95 | 2452 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2453 | return wait_lwp (lp); |
2454 | } | |
2455 | ||
2456 | return status; | |
2457 | } | |
2458 | ||
9f0bdab8 DJ |
2459 | /* Save the most recent siginfo for LP. This is currently only called |
2460 | for SIGTRAP; some ports use the si_addr field for | |
2461 | target_stopped_data_address. In the future, it may also be used to | |
2462 | restore the siginfo of requeued signals. */ | |
2463 | ||
2464 | static void | |
2465 | save_siginfo (struct lwp_info *lp) | |
2466 | { | |
2467 | errno = 0; | |
2468 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2469 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2470 | ||
2471 | if (errno != 0) | |
2472 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2473 | } | |
2474 | ||
d6b0e80f AC |
2475 | /* Send a SIGSTOP to LP. */ |
2476 | ||
2477 | static int | |
2478 | stop_callback (struct lwp_info *lp, void *data) | |
2479 | { | |
2480 | if (!lp->stopped && !lp->signalled) | |
2481 | { | |
2482 | int ret; | |
2483 | ||
2484 | if (debug_linux_nat) | |
2485 | { | |
2486 | fprintf_unfiltered (gdb_stdlog, | |
2487 | "SC: kill %s **<SIGSTOP>**\n", | |
2488 | target_pid_to_str (lp->ptid)); | |
2489 | } | |
2490 | errno = 0; | |
2491 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2492 | if (debug_linux_nat) | |
2493 | { | |
2494 | fprintf_unfiltered (gdb_stdlog, | |
2495 | "SC: lwp kill %d %s\n", | |
2496 | ret, | |
2497 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2498 | } | |
2499 | ||
2500 | lp->signalled = 1; | |
2501 | gdb_assert (lp->status == 0); | |
2502 | } | |
2503 | ||
2504 | return 0; | |
2505 | } | |
2506 | ||
57380f4e | 2507 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2508 | |
2509 | static int | |
57380f4e DJ |
2510 | linux_nat_has_pending_sigint (int pid) |
2511 | { | |
2512 | sigset_t pending, blocked, ignored; | |
57380f4e DJ |
2513 | |
2514 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2515 | ||
2516 | if (sigismember (&pending, SIGINT) | |
2517 | && !sigismember (&ignored, SIGINT)) | |
2518 | return 1; | |
2519 | ||
2520 | return 0; | |
2521 | } | |
2522 | ||
2523 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2524 | ||
2525 | static int | |
2526 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2527 | { |
57380f4e DJ |
2528 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2529 | flag to consume the next one. */ | |
2530 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2531 | && WSTOPSIG (lp->status) == SIGINT) | |
2532 | lp->status = 0; | |
2533 | else | |
2534 | lp->ignore_sigint = 1; | |
2535 | ||
2536 | return 0; | |
2537 | } | |
2538 | ||
2539 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2540 | This function is called after we know the LWP has stopped; if the LWP | |
2541 | stopped before the expected SIGINT was delivered, then it will never have | |
2542 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2543 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2544 | |
57380f4e DJ |
2545 | static void |
2546 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2547 | { | |
2548 | if (!lp->ignore_sigint) | |
2549 | return; | |
2550 | ||
2551 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2552 | { | |
2553 | if (debug_linux_nat) | |
2554 | fprintf_unfiltered (gdb_stdlog, | |
2555 | "MCIS: Clearing bogus flag for %s\n", | |
2556 | target_pid_to_str (lp->ptid)); | |
2557 | lp->ignore_sigint = 0; | |
2558 | } | |
2559 | } | |
2560 | ||
ebec9a0f PA |
2561 | /* Fetch the possible triggered data watchpoint info and store it in |
2562 | LP. | |
2563 | ||
2564 | On some archs, like x86, that use debug registers to set | |
2565 | watchpoints, it's possible that the way to know which watched | |
2566 | address trapped, is to check the register that is used to select | |
2567 | which address to watch. Problem is, between setting the watchpoint | |
2568 | and reading back which data address trapped, the user may change | |
2569 | the set of watchpoints, and, as a consequence, GDB changes the | |
2570 | debug registers in the inferior. To avoid reading back a stale | |
2571 | stopped-data-address when that happens, we cache in LP the fact | |
2572 | that a watchpoint trapped, and the corresponding data address, as | |
2573 | soon as we see LP stop with a SIGTRAP. If GDB changes the debug | |
2574 | registers meanwhile, we have the cached data we can rely on. */ | |
2575 | ||
2576 | static void | |
2577 | save_sigtrap (struct lwp_info *lp) | |
2578 | { | |
2579 | struct cleanup *old_chain; | |
2580 | ||
2581 | if (linux_ops->to_stopped_by_watchpoint == NULL) | |
2582 | { | |
2583 | lp->stopped_by_watchpoint = 0; | |
2584 | return; | |
2585 | } | |
2586 | ||
2587 | old_chain = save_inferior_ptid (); | |
2588 | inferior_ptid = lp->ptid; | |
2589 | ||
2590 | lp->stopped_by_watchpoint = linux_ops->to_stopped_by_watchpoint (); | |
2591 | ||
2592 | if (lp->stopped_by_watchpoint) | |
2593 | { | |
2594 | if (linux_ops->to_stopped_data_address != NULL) | |
2595 | lp->stopped_data_address_p = | |
2596 | linux_ops->to_stopped_data_address (¤t_target, | |
2597 | &lp->stopped_data_address); | |
2598 | else | |
2599 | lp->stopped_data_address_p = 0; | |
2600 | } | |
2601 | ||
2602 | do_cleanups (old_chain); | |
2603 | } | |
2604 | ||
2605 | /* See save_sigtrap. */ | |
2606 | ||
2607 | static int | |
2608 | linux_nat_stopped_by_watchpoint (void) | |
2609 | { | |
2610 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2611 | ||
2612 | gdb_assert (lp != NULL); | |
2613 | ||
2614 | return lp->stopped_by_watchpoint; | |
2615 | } | |
2616 | ||
2617 | static int | |
2618 | linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) | |
2619 | { | |
2620 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2621 | ||
2622 | gdb_assert (lp != NULL); | |
2623 | ||
2624 | *addr_p = lp->stopped_data_address; | |
2625 | ||
2626 | return lp->stopped_data_address_p; | |
2627 | } | |
2628 | ||
26ab7092 JK |
2629 | /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */ |
2630 | ||
2631 | static int | |
2632 | sigtrap_is_event (int status) | |
2633 | { | |
2634 | return WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP; | |
2635 | } | |
2636 | ||
2637 | /* SIGTRAP-like events recognizer. */ | |
2638 | ||
2639 | static int (*linux_nat_status_is_event) (int status) = sigtrap_is_event; | |
2640 | ||
00390b84 JK |
2641 | /* Check for SIGTRAP-like events in LP. */ |
2642 | ||
2643 | static int | |
2644 | linux_nat_lp_status_is_event (struct lwp_info *lp) | |
2645 | { | |
2646 | /* We check for lp->waitstatus in addition to lp->status, because we can | |
2647 | have pending process exits recorded in lp->status | |
2648 | and W_EXITCODE(0,0) == 0. We should probably have an additional | |
2649 | lp->status_p flag. */ | |
2650 | ||
2651 | return (lp->waitstatus.kind == TARGET_WAITKIND_IGNORE | |
2652 | && linux_nat_status_is_event (lp->status)); | |
2653 | } | |
2654 | ||
26ab7092 JK |
2655 | /* Set alternative SIGTRAP-like events recognizer. If |
2656 | breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be | |
2657 | applied. */ | |
2658 | ||
2659 | void | |
2660 | linux_nat_set_status_is_event (struct target_ops *t, | |
2661 | int (*status_is_event) (int status)) | |
2662 | { | |
2663 | linux_nat_status_is_event = status_is_event; | |
2664 | } | |
2665 | ||
57380f4e DJ |
2666 | /* Wait until LP is stopped. */ |
2667 | ||
2668 | static int | |
2669 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2670 | { | |
6c95b8df PA |
2671 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
2672 | ||
2673 | /* If this is a vfork parent, bail out, it is not going to report | |
2674 | any SIGSTOP until the vfork is done with. */ | |
2675 | if (inf->vfork_child != NULL) | |
2676 | return 0; | |
2677 | ||
d6b0e80f AC |
2678 | if (!lp->stopped) |
2679 | { | |
2680 | int status; | |
2681 | ||
2682 | status = wait_lwp (lp); | |
2683 | if (status == 0) | |
2684 | return 0; | |
2685 | ||
57380f4e DJ |
2686 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2687 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2688 | { |
57380f4e | 2689 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2690 | |
2691 | errno = 0; | |
2692 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2693 | if (debug_linux_nat) | |
2694 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2695 | "PTRACE_CONT %s, 0, 0 (%s) " |
2696 | "(discarding SIGINT)\n", | |
d6b0e80f AC |
2697 | target_pid_to_str (lp->ptid), |
2698 | errno ? safe_strerror (errno) : "OK"); | |
2699 | ||
57380f4e | 2700 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2701 | } |
2702 | ||
57380f4e DJ |
2703 | maybe_clear_ignore_sigint (lp); |
2704 | ||
d6b0e80f AC |
2705 | if (WSTOPSIG (status) != SIGSTOP) |
2706 | { | |
26ab7092 | 2707 | if (linux_nat_status_is_event (status)) |
d6b0e80f AC |
2708 | { |
2709 | /* If a LWP other than the LWP that we're reporting an | |
2710 | event for has hit a GDB breakpoint (as opposed to | |
2711 | some random trap signal), then just arrange for it to | |
2712 | hit it again later. We don't keep the SIGTRAP status | |
2713 | and don't forward the SIGTRAP signal to the LWP. We | |
2714 | will handle the current event, eventually we will | |
2715 | resume all LWPs, and this one will get its breakpoint | |
2716 | trap again. | |
2717 | ||
2718 | If we do not do this, then we run the risk that the | |
2719 | user will delete or disable the breakpoint, but the | |
2720 | thread will have already tripped on it. */ | |
2721 | ||
9f0bdab8 DJ |
2722 | /* Save the trap's siginfo in case we need it later. */ |
2723 | save_siginfo (lp); | |
2724 | ||
ebec9a0f PA |
2725 | save_sigtrap (lp); |
2726 | ||
1777feb0 | 2727 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2728 | errno = 0; |
2729 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2730 | if (debug_linux_nat) | |
2731 | { | |
2732 | fprintf_unfiltered (gdb_stdlog, | |
2733 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2734 | target_pid_to_str (lp->ptid), | |
2735 | errno ? safe_strerror (errno) : "OK"); | |
2736 | ||
2737 | fprintf_unfiltered (gdb_stdlog, | |
2738 | "SWC: Candidate SIGTRAP event in %s\n", | |
2739 | target_pid_to_str (lp->ptid)); | |
2740 | } | |
710151dd | 2741 | /* Hold this event/waitstatus while we check to see if |
1777feb0 | 2742 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2743 | stop_wait_callback (lp, NULL); |
710151dd | 2744 | |
7feb7d06 PA |
2745 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2746 | there's another event, throw it back into the | |
1777feb0 | 2747 | queue. */ |
7feb7d06 | 2748 | if (lp->status) |
710151dd | 2749 | { |
7feb7d06 PA |
2750 | if (debug_linux_nat) |
2751 | fprintf_unfiltered (gdb_stdlog, | |
2752 | "SWC: kill %s, %s\n", | |
2753 | target_pid_to_str (lp->ptid), | |
2754 | status_to_str ((int) status)); | |
2755 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2756 | } |
7feb7d06 | 2757 | |
1777feb0 | 2758 | /* Save the sigtrap event. */ |
7feb7d06 | 2759 | lp->status = status; |
d6b0e80f AC |
2760 | return 0; |
2761 | } | |
2762 | else | |
2763 | { | |
2764 | /* The thread was stopped with a signal other than | |
1777feb0 | 2765 | SIGSTOP, and didn't accidentally trip a breakpoint. */ |
d6b0e80f AC |
2766 | |
2767 | if (debug_linux_nat) | |
2768 | { | |
2769 | fprintf_unfiltered (gdb_stdlog, | |
2770 | "SWC: Pending event %s in %s\n", | |
2771 | status_to_str ((int) status), | |
2772 | target_pid_to_str (lp->ptid)); | |
2773 | } | |
1777feb0 | 2774 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2775 | errno = 0; |
2776 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2777 | if (debug_linux_nat) | |
2778 | fprintf_unfiltered (gdb_stdlog, | |
2779 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2780 | target_pid_to_str (lp->ptid), | |
2781 | errno ? safe_strerror (errno) : "OK"); | |
2782 | ||
2783 | /* Hold this event/waitstatus while we check to see if | |
1777feb0 | 2784 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2785 | stop_wait_callback (lp, NULL); |
710151dd PA |
2786 | |
2787 | /* If the lp->status field is still empty, use it to | |
2788 | hold this event. If not, then this event must be | |
2789 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2790 | if (lp->status) |
d6b0e80f AC |
2791 | { |
2792 | if (debug_linux_nat) | |
2793 | { | |
2794 | fprintf_unfiltered (gdb_stdlog, | |
2795 | "SWC: kill %s, %s\n", | |
2796 | target_pid_to_str (lp->ptid), | |
2797 | status_to_str ((int) status)); | |
2798 | } | |
2799 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2800 | } | |
710151dd PA |
2801 | else |
2802 | lp->status = status; | |
d6b0e80f AC |
2803 | return 0; |
2804 | } | |
2805 | } | |
2806 | else | |
2807 | { | |
2808 | /* We caught the SIGSTOP that we intended to catch, so | |
2809 | there's no SIGSTOP pending. */ | |
2810 | lp->stopped = 1; | |
2811 | lp->signalled = 0; | |
2812 | } | |
2813 | } | |
2814 | ||
2815 | return 0; | |
2816 | } | |
2817 | ||
d6b0e80f AC |
2818 | /* Return non-zero if LP has a wait status pending. */ |
2819 | ||
2820 | static int | |
2821 | status_callback (struct lwp_info *lp, void *data) | |
2822 | { | |
2823 | /* Only report a pending wait status if we pretend that this has | |
2824 | indeed been resumed. */ | |
ca2163eb PA |
2825 | if (!lp->resumed) |
2826 | return 0; | |
2827 | ||
2828 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2829 | { | |
2830 | /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event, | |
766062f6 | 2831 | or a pending process exit. Note that `W_EXITCODE(0,0) == |
ca2163eb PA |
2832 | 0', so a clean process exit can not be stored pending in |
2833 | lp->status, it is indistinguishable from | |
2834 | no-pending-status. */ | |
2835 | return 1; | |
2836 | } | |
2837 | ||
2838 | if (lp->status != 0) | |
2839 | return 1; | |
2840 | ||
2841 | return 0; | |
d6b0e80f AC |
2842 | } |
2843 | ||
2844 | /* Return non-zero if LP isn't stopped. */ | |
2845 | ||
2846 | static int | |
2847 | running_callback (struct lwp_info *lp, void *data) | |
2848 | { | |
2849 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2850 | } | |
2851 | ||
2852 | /* Count the LWP's that have had events. */ | |
2853 | ||
2854 | static int | |
2855 | count_events_callback (struct lwp_info *lp, void *data) | |
2856 | { | |
2857 | int *count = data; | |
2858 | ||
2859 | gdb_assert (count != NULL); | |
2860 | ||
e09490f1 | 2861 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2862 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2863 | (*count)++; |
2864 | ||
2865 | return 0; | |
2866 | } | |
2867 | ||
2868 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2869 | ||
2870 | static int | |
2871 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2872 | { | |
2873 | if (lp->step && lp->status != 0) | |
2874 | return 1; | |
2875 | else | |
2876 | return 0; | |
2877 | } | |
2878 | ||
2879 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2880 | ||
2881 | static int | |
2882 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2883 | { | |
2884 | int *selector = data; | |
2885 | ||
2886 | gdb_assert (selector != NULL); | |
2887 | ||
1777feb0 | 2888 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2889 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2890 | if ((*selector)-- == 0) |
2891 | return 1; | |
2892 | ||
2893 | return 0; | |
2894 | } | |
2895 | ||
710151dd PA |
2896 | static int |
2897 | cancel_breakpoint (struct lwp_info *lp) | |
2898 | { | |
2899 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2900 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2901 | LWP. We will handle the current event, eventually we will resume | |
2902 | this LWP, and this breakpoint will trap again. | |
2903 | ||
2904 | If we do not do this, then we run the risk that the user will | |
2905 | delete or disable the breakpoint, but the LWP will have already | |
2906 | tripped on it. */ | |
2907 | ||
515630c5 UW |
2908 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2909 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2910 | CORE_ADDR pc; | |
2911 | ||
2912 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
6c95b8df | 2913 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
710151dd PA |
2914 | { |
2915 | if (debug_linux_nat) | |
2916 | fprintf_unfiltered (gdb_stdlog, | |
2917 | "CB: Push back breakpoint for %s\n", | |
2918 | target_pid_to_str (lp->ptid)); | |
2919 | ||
2920 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2921 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2922 | regcache_write_pc (regcache, pc); | |
2923 | ||
710151dd PA |
2924 | return 1; |
2925 | } | |
2926 | return 0; | |
2927 | } | |
2928 | ||
d6b0e80f AC |
2929 | static int |
2930 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2931 | { | |
2932 | struct lwp_info *event_lp = data; | |
2933 | ||
2934 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2935 | if (lp == event_lp) | |
2936 | return 0; | |
2937 | ||
2938 | /* If a LWP other than the LWP that we're reporting an event for has | |
2939 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2940 | then just arrange for it to hit it again later. We don't keep | |
2941 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2942 | LWP. We will handle the current event, eventually we will resume | |
2943 | all LWPs, and this one will get its breakpoint trap again. | |
2944 | ||
2945 | If we do not do this, then we run the risk that the user will | |
2946 | delete or disable the breakpoint, but the LWP will have already | |
2947 | tripped on it. */ | |
2948 | ||
00390b84 | 2949 | if (linux_nat_lp_status_is_event (lp) |
710151dd PA |
2950 | && cancel_breakpoint (lp)) |
2951 | /* Throw away the SIGTRAP. */ | |
2952 | lp->status = 0; | |
d6b0e80f AC |
2953 | |
2954 | return 0; | |
2955 | } | |
2956 | ||
2957 | /* Select one LWP out of those that have events pending. */ | |
2958 | ||
2959 | static void | |
d90e17a7 | 2960 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
2961 | { |
2962 | int num_events = 0; | |
2963 | int random_selector; | |
2964 | struct lwp_info *event_lp; | |
2965 | ||
ac264b3b | 2966 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2967 | (*orig_lp)->status = *status; |
2968 | ||
2969 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
2970 | event_lp = iterate_over_lwps (filter, |
2971 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
2972 | if (event_lp != NULL) |
2973 | { | |
2974 | if (debug_linux_nat) | |
2975 | fprintf_unfiltered (gdb_stdlog, | |
2976 | "SEL: Select single-step %s\n", | |
2977 | target_pid_to_str (event_lp->ptid)); | |
2978 | } | |
2979 | else | |
2980 | { | |
2981 | /* No single-stepping LWP. Select one at random, out of those | |
2982 | which have had SIGTRAP events. */ | |
2983 | ||
2984 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 2985 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
2986 | |
2987 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2988 | random_selector = (int) | |
2989 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2990 | ||
2991 | if (debug_linux_nat && num_events > 1) | |
2992 | fprintf_unfiltered (gdb_stdlog, | |
2993 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2994 | num_events, random_selector); | |
2995 | ||
d90e17a7 PA |
2996 | event_lp = iterate_over_lwps (filter, |
2997 | select_event_lwp_callback, | |
d6b0e80f AC |
2998 | &random_selector); |
2999 | } | |
3000 | ||
3001 | if (event_lp != NULL) | |
3002 | { | |
3003 | /* Switch the event LWP. */ | |
3004 | *orig_lp = event_lp; | |
3005 | *status = event_lp->status; | |
3006 | } | |
3007 | ||
3008 | /* Flush the wait status for the event LWP. */ | |
3009 | (*orig_lp)->status = 0; | |
3010 | } | |
3011 | ||
3012 | /* Return non-zero if LP has been resumed. */ | |
3013 | ||
3014 | static int | |
3015 | resumed_callback (struct lwp_info *lp, void *data) | |
3016 | { | |
3017 | return lp->resumed; | |
3018 | } | |
3019 | ||
d6b0e80f AC |
3020 | /* Stop an active thread, verify it still exists, then resume it. */ |
3021 | ||
3022 | static int | |
3023 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
3024 | { | |
3025 | struct lwp_info *ptr; | |
3026 | ||
3027 | if (!lp->stopped && !lp->signalled) | |
3028 | { | |
3029 | stop_callback (lp, NULL); | |
3030 | stop_wait_callback (lp, NULL); | |
3031 | /* Resume if the lwp still exists. */ | |
3032 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
3033 | if (lp == ptr) | |
3034 | { | |
3035 | resume_callback (lp, NULL); | |
3036 | resume_set_callback (lp, NULL); | |
3037 | } | |
3038 | } | |
3039 | return 0; | |
3040 | } | |
3041 | ||
02f3fc28 | 3042 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 3043 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
3044 | static struct lwp_info * |
3045 | linux_nat_filter_event (int lwpid, int status, int options) | |
3046 | { | |
3047 | struct lwp_info *lp; | |
3048 | ||
3049 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
3050 | ||
3051 | /* Check for stop events reported by a process we didn't already | |
3052 | know about - anything not already in our LWP list. | |
3053 | ||
3054 | If we're expecting to receive stopped processes after | |
3055 | fork, vfork, and clone events, then we'll just add the | |
3056 | new one to our list and go back to waiting for the event | |
3057 | to be reported - the stopped process might be returned | |
3058 | from waitpid before or after the event is. */ | |
3059 | if (WIFSTOPPED (status) && !lp) | |
3060 | { | |
3061 | linux_record_stopped_pid (lwpid, status); | |
3062 | return NULL; | |
3063 | } | |
3064 | ||
3065 | /* Make sure we don't report an event for the exit of an LWP not in | |
1777feb0 | 3066 | our list, i.e. not part of the current process. This can happen |
fd62cb89 | 3067 | if we detach from a program we originally forked and then it |
02f3fc28 PA |
3068 | exits. */ |
3069 | if (!WIFSTOPPED (status) && !lp) | |
3070 | return NULL; | |
3071 | ||
3072 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
3073 | CLONE_PTRACE processes which do not use the thread library - | |
3074 | otherwise we wouldn't find the new LWP this way. That doesn't | |
3075 | currently work, and the following code is currently unreachable | |
3076 | due to the two blocks above. If it's fixed some day, this code | |
3077 | should be broken out into a function so that we can also pick up | |
3078 | LWPs from the new interface. */ | |
3079 | if (!lp) | |
3080 | { | |
3081 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
3082 | if (options & __WCLONE) | |
3083 | lp->cloned = 1; | |
3084 | ||
3085 | gdb_assert (WIFSTOPPED (status) | |
3086 | && WSTOPSIG (status) == SIGSTOP); | |
3087 | lp->signalled = 1; | |
3088 | ||
3089 | if (!in_thread_list (inferior_ptid)) | |
3090 | { | |
3091 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
3092 | GET_PID (inferior_ptid)); | |
3093 | add_thread (inferior_ptid); | |
3094 | } | |
3095 | ||
3096 | add_thread (lp->ptid); | |
3097 | } | |
3098 | ||
ca2163eb PA |
3099 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3100 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3101 | { | |
3102 | /* No longer need the sysgood bit. The ptrace event ends up | |
3103 | recorded in lp->waitstatus if we care for it. We can carry | |
3104 | on handling the event like a regular SIGTRAP from here | |
3105 | on. */ | |
3106 | status = W_STOPCODE (SIGTRAP); | |
3107 | if (linux_handle_syscall_trap (lp, 0)) | |
3108 | return NULL; | |
3109 | } | |
02f3fc28 | 3110 | |
ca2163eb PA |
3111 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
3112 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
02f3fc28 PA |
3113 | { |
3114 | if (debug_linux_nat) | |
3115 | fprintf_unfiltered (gdb_stdlog, | |
3116 | "LLW: Handling extended status 0x%06x\n", | |
3117 | status); | |
3118 | if (linux_handle_extended_wait (lp, status, 0)) | |
3119 | return NULL; | |
3120 | } | |
3121 | ||
26ab7092 | 3122 | if (linux_nat_status_is_event (status)) |
ebec9a0f PA |
3123 | { |
3124 | /* Save the trap's siginfo in case we need it later. */ | |
3125 | save_siginfo (lp); | |
3126 | ||
3127 | save_sigtrap (lp); | |
3128 | } | |
ca2163eb | 3129 | |
02f3fc28 | 3130 | /* Check if the thread has exited. */ |
d90e17a7 PA |
3131 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
3132 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 3133 | { |
9db03742 JB |
3134 | /* If this is the main thread, we must stop all threads and verify |
3135 | if they are still alive. This is because in the nptl thread model | |
3136 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
3137 | other than the main thread. We only get the main thread exit |
3138 | signal once all child threads have already exited. If we | |
3139 | stop all the threads and use the stop_wait_callback to check | |
3140 | if they have exited we can determine whether this signal | |
3141 | should be ignored or whether it means the end of the debugged | |
3142 | application, regardless of which threading model is being | |
5d3b6af6 | 3143 | used. */ |
02f3fc28 PA |
3144 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
3145 | { | |
3146 | lp->stopped = 1; | |
d90e17a7 PA |
3147 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
3148 | stop_and_resume_callback, NULL); | |
02f3fc28 PA |
3149 | } |
3150 | ||
3151 | if (debug_linux_nat) | |
3152 | fprintf_unfiltered (gdb_stdlog, | |
3153 | "LLW: %s exited.\n", | |
3154 | target_pid_to_str (lp->ptid)); | |
3155 | ||
d90e17a7 | 3156 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
3157 | { |
3158 | /* If there is at least one more LWP, then the exit signal | |
3159 | was not the end of the debugged application and should be | |
3160 | ignored. */ | |
3161 | exit_lwp (lp); | |
3162 | return NULL; | |
3163 | } | |
02f3fc28 PA |
3164 | } |
3165 | ||
3166 | /* Check if the current LWP has previously exited. In the nptl | |
3167 | thread model, LWPs other than the main thread do not issue | |
3168 | signals when they exit so we must check whenever the thread has | |
3169 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 3170 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 3171 | { |
d90e17a7 PA |
3172 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
3173 | ||
02f3fc28 PA |
3174 | if (debug_linux_nat) |
3175 | fprintf_unfiltered (gdb_stdlog, | |
3176 | "LLW: %s exited.\n", | |
3177 | target_pid_to_str (lp->ptid)); | |
3178 | ||
3179 | exit_lwp (lp); | |
3180 | ||
3181 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 3182 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
3183 | |
3184 | /* Discard the event. */ | |
3185 | return NULL; | |
3186 | } | |
3187 | ||
3188 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
3189 | an attempt to stop an LWP. */ | |
3190 | if (lp->signalled | |
3191 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3192 | { | |
3193 | if (debug_linux_nat) | |
3194 | fprintf_unfiltered (gdb_stdlog, | |
3195 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
3196 | target_pid_to_str (lp->ptid)); | |
3197 | ||
3198 | /* This is a delayed SIGSTOP. */ | |
3199 | lp->signalled = 0; | |
3200 | ||
3201 | registers_changed (); | |
3202 | ||
28439f5e | 3203 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
02f3fc28 PA |
3204 | lp->step, TARGET_SIGNAL_0); |
3205 | if (debug_linux_nat) | |
3206 | fprintf_unfiltered (gdb_stdlog, | |
3207 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
3208 | lp->step ? | |
3209 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3210 | target_pid_to_str (lp->ptid)); | |
3211 | ||
3212 | lp->stopped = 0; | |
3213 | gdb_assert (lp->resumed); | |
3214 | ||
3215 | /* Discard the event. */ | |
3216 | return NULL; | |
3217 | } | |
3218 | ||
57380f4e DJ |
3219 | /* Make sure we don't report a SIGINT that we have already displayed |
3220 | for another thread. */ | |
3221 | if (lp->ignore_sigint | |
3222 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3223 | { | |
3224 | if (debug_linux_nat) | |
3225 | fprintf_unfiltered (gdb_stdlog, | |
3226 | "LLW: Delayed SIGINT caught for %s.\n", | |
3227 | target_pid_to_str (lp->ptid)); | |
3228 | ||
3229 | /* This is a delayed SIGINT. */ | |
3230 | lp->ignore_sigint = 0; | |
3231 | ||
3232 | registers_changed (); | |
28439f5e | 3233 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
3234 | lp->step, TARGET_SIGNAL_0); |
3235 | if (debug_linux_nat) | |
3236 | fprintf_unfiltered (gdb_stdlog, | |
3237 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3238 | lp->step ? | |
3239 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3240 | target_pid_to_str (lp->ptid)); | |
3241 | ||
3242 | lp->stopped = 0; | |
3243 | gdb_assert (lp->resumed); | |
3244 | ||
3245 | /* Discard the event. */ | |
3246 | return NULL; | |
3247 | } | |
3248 | ||
02f3fc28 PA |
3249 | /* An interesting event. */ |
3250 | gdb_assert (lp); | |
ca2163eb | 3251 | lp->status = status; |
02f3fc28 PA |
3252 | return lp; |
3253 | } | |
3254 | ||
d6b0e80f | 3255 | static ptid_t |
7feb7d06 | 3256 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3257 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3258 | int target_options) | |
d6b0e80f | 3259 | { |
7feb7d06 | 3260 | static sigset_t prev_mask; |
d6b0e80f AC |
3261 | struct lwp_info *lp = NULL; |
3262 | int options = 0; | |
3263 | int status = 0; | |
d90e17a7 | 3264 | pid_t pid; |
d6b0e80f | 3265 | |
b84876c2 PA |
3266 | if (debug_linux_nat_async) |
3267 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); | |
3268 | ||
f973ed9c DJ |
3269 | /* The first time we get here after starting a new inferior, we may |
3270 | not have added it to the LWP list yet - this is the earliest | |
3271 | moment at which we know its PID. */ | |
d90e17a7 | 3272 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3273 | { |
27c9d204 PA |
3274 | /* Upgrade the main thread's ptid. */ |
3275 | thread_change_ptid (inferior_ptid, | |
3276 | BUILD_LWP (GET_PID (inferior_ptid), | |
3277 | GET_PID (inferior_ptid))); | |
3278 | ||
f973ed9c DJ |
3279 | lp = add_lwp (inferior_ptid); |
3280 | lp->resumed = 1; | |
3281 | } | |
3282 | ||
7feb7d06 PA |
3283 | /* Make sure SIGCHLD is blocked. */ |
3284 | block_child_signals (&prev_mask); | |
d6b0e80f | 3285 | |
d90e17a7 PA |
3286 | if (ptid_equal (ptid, minus_one_ptid)) |
3287 | pid = -1; | |
3288 | else if (ptid_is_pid (ptid)) | |
3289 | /* A request to wait for a specific tgid. This is not possible | |
3290 | with waitpid, so instead, we wait for any child, and leave | |
3291 | children we're not interested in right now with a pending | |
3292 | status to report later. */ | |
3293 | pid = -1; | |
3294 | else | |
3295 | pid = GET_LWP (ptid); | |
3296 | ||
d6b0e80f | 3297 | retry: |
d90e17a7 PA |
3298 | lp = NULL; |
3299 | status = 0; | |
d6b0e80f | 3300 | |
e3e9f5a2 PA |
3301 | /* Make sure that of those LWPs we want to get an event from, there |
3302 | is at least one LWP that has been resumed. If there's none, just | |
3303 | bail out. The core may just be flushing asynchronously all | |
3304 | events. */ | |
3305 | if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL) | |
3306 | { | |
3307 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3308 | ||
3309 | if (debug_linux_nat_async) | |
3310 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n"); | |
3311 | ||
3312 | restore_child_signals_mask (&prev_mask); | |
3313 | return minus_one_ptid; | |
3314 | } | |
d6b0e80f AC |
3315 | |
3316 | /* First check if there is a LWP with a wait status pending. */ | |
3317 | if (pid == -1) | |
3318 | { | |
3319 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 3320 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
3321 | if (lp) |
3322 | { | |
ca2163eb | 3323 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3324 | fprintf_unfiltered (gdb_stdlog, |
3325 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3326 | status_to_str (lp->status), |
d6b0e80f AC |
3327 | target_pid_to_str (lp->ptid)); |
3328 | } | |
3329 | ||
b84876c2 | 3330 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
3331 | cloned and uncloned processes. We start with the cloned |
3332 | processes. */ | |
d6b0e80f AC |
3333 | options = __WCLONE | WNOHANG; |
3334 | } | |
3335 | else if (is_lwp (ptid)) | |
3336 | { | |
3337 | if (debug_linux_nat) | |
3338 | fprintf_unfiltered (gdb_stdlog, | |
3339 | "LLW: Waiting for specific LWP %s.\n", | |
3340 | target_pid_to_str (ptid)); | |
3341 | ||
3342 | /* We have a specific LWP to check. */ | |
3343 | lp = find_lwp_pid (ptid); | |
3344 | gdb_assert (lp); | |
d6b0e80f | 3345 | |
ca2163eb | 3346 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3347 | fprintf_unfiltered (gdb_stdlog, |
3348 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3349 | status_to_str (lp->status), |
d6b0e80f AC |
3350 | target_pid_to_str (lp->ptid)); |
3351 | ||
3352 | /* If we have to wait, take into account whether PID is a cloned | |
3353 | process or not. And we have to convert it to something that | |
3354 | the layer beneath us can understand. */ | |
3355 | options = lp->cloned ? __WCLONE : 0; | |
3356 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
3357 | |
3358 | /* We check for lp->waitstatus in addition to lp->status, | |
3359 | because we can have pending process exits recorded in | |
3360 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
3361 | an additional lp->status_p flag. */ | |
ca2163eb | 3362 | if (lp->status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) |
d90e17a7 | 3363 | lp = NULL; |
d6b0e80f AC |
3364 | } |
3365 | ||
d90e17a7 | 3366 | if (lp && lp->signalled) |
d6b0e80f AC |
3367 | { |
3368 | /* A pending SIGSTOP may interfere with the normal stream of | |
3369 | events. In a typical case where interference is a problem, | |
3370 | we have a SIGSTOP signal pending for LWP A while | |
3371 | single-stepping it, encounter an event in LWP B, and take the | |
3372 | pending SIGSTOP while trying to stop LWP A. After processing | |
3373 | the event in LWP B, LWP A is continued, and we'll never see | |
3374 | the SIGTRAP associated with the last time we were | |
3375 | single-stepping LWP A. */ | |
3376 | ||
3377 | /* Resume the thread. It should halt immediately returning the | |
3378 | pending SIGSTOP. */ | |
3379 | registers_changed (); | |
28439f5e | 3380 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3381 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
3382 | if (debug_linux_nat) |
3383 | fprintf_unfiltered (gdb_stdlog, | |
3384 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
3385 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3386 | target_pid_to_str (lp->ptid)); | |
3387 | lp->stopped = 0; | |
3388 | gdb_assert (lp->resumed); | |
3389 | ||
ca2163eb PA |
3390 | /* Catch the pending SIGSTOP. */ |
3391 | status = lp->status; | |
3392 | lp->status = 0; | |
3393 | ||
d6b0e80f | 3394 | stop_wait_callback (lp, NULL); |
ca2163eb PA |
3395 | |
3396 | /* If the lp->status field isn't empty, we caught another signal | |
3397 | while flushing the SIGSTOP. Return it back to the event | |
3398 | queue of the LWP, as we already have an event to handle. */ | |
3399 | if (lp->status) | |
3400 | { | |
3401 | if (debug_linux_nat) | |
3402 | fprintf_unfiltered (gdb_stdlog, | |
3403 | "LLW: kill %s, %s\n", | |
3404 | target_pid_to_str (lp->ptid), | |
3405 | status_to_str (lp->status)); | |
3406 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
3407 | } | |
3408 | ||
3409 | lp->status = status; | |
d6b0e80f AC |
3410 | } |
3411 | ||
b84876c2 PA |
3412 | if (!target_can_async_p ()) |
3413 | { | |
3414 | /* Causes SIGINT to be passed on to the attached process. */ | |
3415 | set_sigint_trap (); | |
b84876c2 | 3416 | } |
d6b0e80f | 3417 | |
47608cb1 PA |
3418 | /* Translate generic target_wait options into waitpid options. */ |
3419 | if (target_options & TARGET_WNOHANG) | |
3420 | options |= WNOHANG; | |
7feb7d06 | 3421 | |
d90e17a7 | 3422 | while (lp == NULL) |
d6b0e80f AC |
3423 | { |
3424 | pid_t lwpid; | |
3425 | ||
7feb7d06 | 3426 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 3427 | |
d6b0e80f AC |
3428 | if (lwpid > 0) |
3429 | { | |
3430 | gdb_assert (pid == -1 || lwpid == pid); | |
3431 | ||
3432 | if (debug_linux_nat) | |
3433 | { | |
3434 | fprintf_unfiltered (gdb_stdlog, | |
3435 | "LLW: waitpid %ld received %s\n", | |
3436 | (long) lwpid, status_to_str (status)); | |
3437 | } | |
3438 | ||
02f3fc28 | 3439 | lp = linux_nat_filter_event (lwpid, status, options); |
d90e17a7 | 3440 | |
33355866 JK |
3441 | /* STATUS is now no longer valid, use LP->STATUS instead. */ |
3442 | status = 0; | |
3443 | ||
d90e17a7 PA |
3444 | if (lp |
3445 | && ptid_is_pid (ptid) | |
3446 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 3447 | { |
e3e9f5a2 PA |
3448 | gdb_assert (lp->resumed); |
3449 | ||
d90e17a7 | 3450 | if (debug_linux_nat) |
3e43a32a MS |
3451 | fprintf (stderr, |
3452 | "LWP %ld got an event %06x, leaving pending.\n", | |
33355866 | 3453 | ptid_get_lwp (lp->ptid), lp->status); |
d90e17a7 | 3454 | |
ca2163eb | 3455 | if (WIFSTOPPED (lp->status)) |
d90e17a7 | 3456 | { |
ca2163eb | 3457 | if (WSTOPSIG (lp->status) != SIGSTOP) |
d90e17a7 | 3458 | { |
e3e9f5a2 PA |
3459 | /* Cancel breakpoint hits. The breakpoint may |
3460 | be removed before we fetch events from this | |
3461 | process to report to the core. It is best | |
3462 | not to assume the moribund breakpoints | |
3463 | heuristic always handles these cases --- it | |
3464 | could be too many events go through to the | |
3465 | core before this one is handled. All-stop | |
3466 | always cancels breakpoint hits in all | |
3467 | threads. */ | |
3468 | if (non_stop | |
00390b84 | 3469 | && linux_nat_lp_status_is_event (lp) |
e3e9f5a2 PA |
3470 | && cancel_breakpoint (lp)) |
3471 | { | |
3472 | /* Throw away the SIGTRAP. */ | |
3473 | lp->status = 0; | |
3474 | ||
3475 | if (debug_linux_nat) | |
3476 | fprintf (stderr, | |
3e43a32a MS |
3477 | "LLW: LWP %ld hit a breakpoint while" |
3478 | " waiting for another process;" | |
3479 | " cancelled it\n", | |
e3e9f5a2 PA |
3480 | ptid_get_lwp (lp->ptid)); |
3481 | } | |
3482 | lp->stopped = 1; | |
d90e17a7 PA |
3483 | } |
3484 | else | |
3485 | { | |
3486 | lp->stopped = 1; | |
3487 | lp->signalled = 0; | |
3488 | } | |
3489 | } | |
33355866 | 3490 | else if (WIFEXITED (lp->status) || WIFSIGNALED (lp->status)) |
d90e17a7 PA |
3491 | { |
3492 | if (debug_linux_nat) | |
3e43a32a MS |
3493 | fprintf (stderr, |
3494 | "Process %ld exited while stopping LWPs\n", | |
d90e17a7 PA |
3495 | ptid_get_lwp (lp->ptid)); |
3496 | ||
3497 | /* This was the last lwp in the process. Since | |
3498 | events are serialized to GDB core, and we can't | |
3499 | report this one right now, but GDB core and the | |
3500 | other target layers will want to be notified | |
3501 | about the exit code/signal, leave the status | |
3502 | pending for the next time we're able to report | |
3503 | it. */ | |
d90e17a7 PA |
3504 | |
3505 | /* Prevent trying to stop this thread again. We'll | |
3506 | never try to resume it because it has a pending | |
3507 | status. */ | |
3508 | lp->stopped = 1; | |
3509 | ||
3510 | /* Dead LWP's aren't expected to reported a pending | |
3511 | sigstop. */ | |
3512 | lp->signalled = 0; | |
3513 | ||
3514 | /* Store the pending event in the waitstatus as | |
3515 | well, because W_EXITCODE(0,0) == 0. */ | |
ca2163eb | 3516 | store_waitstatus (&lp->waitstatus, lp->status); |
d90e17a7 PA |
3517 | } |
3518 | ||
3519 | /* Keep looking. */ | |
3520 | lp = NULL; | |
d6b0e80f AC |
3521 | continue; |
3522 | } | |
3523 | ||
d90e17a7 PA |
3524 | if (lp) |
3525 | break; | |
3526 | else | |
3527 | { | |
3528 | if (pid == -1) | |
3529 | { | |
3530 | /* waitpid did return something. Restart over. */ | |
3531 | options |= __WCLONE; | |
3532 | } | |
3533 | continue; | |
3534 | } | |
d6b0e80f AC |
3535 | } |
3536 | ||
3537 | if (pid == -1) | |
3538 | { | |
3539 | /* Alternate between checking cloned and uncloned processes. */ | |
3540 | options ^= __WCLONE; | |
3541 | ||
b84876c2 PA |
3542 | /* And every time we have checked both: |
3543 | In async mode, return to event loop; | |
3544 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 3545 | if (options & __WCLONE) |
b84876c2 | 3546 | { |
47608cb1 | 3547 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
3548 | { |
3549 | /* No interesting event. */ | |
3550 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3551 | ||
b84876c2 PA |
3552 | if (debug_linux_nat_async) |
3553 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3554 | ||
7feb7d06 | 3555 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
3556 | return minus_one_ptid; |
3557 | } | |
3558 | ||
3559 | sigsuspend (&suspend_mask); | |
3560 | } | |
d6b0e80f | 3561 | } |
28736962 PA |
3562 | else if (target_options & TARGET_WNOHANG) |
3563 | { | |
3564 | /* No interesting event for PID yet. */ | |
3565 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3566 | ||
3567 | if (debug_linux_nat_async) | |
3568 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3569 | ||
3570 | restore_child_signals_mask (&prev_mask); | |
3571 | return minus_one_ptid; | |
3572 | } | |
d6b0e80f AC |
3573 | |
3574 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3575 | gdb_assert (lp == NULL); |
d6b0e80f AC |
3576 | } |
3577 | ||
b84876c2 | 3578 | if (!target_can_async_p ()) |
d26b5354 | 3579 | clear_sigint_trap (); |
d6b0e80f AC |
3580 | |
3581 | gdb_assert (lp); | |
3582 | ||
ca2163eb PA |
3583 | status = lp->status; |
3584 | lp->status = 0; | |
3585 | ||
d6b0e80f AC |
3586 | /* Don't report signals that GDB isn't interested in, such as |
3587 | signals that are neither printed nor stopped upon. Stopping all | |
3588 | threads can be a bit time-consuming so if we want decent | |
3589 | performance with heavily multi-threaded programs, especially when | |
3590 | they're using a high frequency timer, we'd better avoid it if we | |
3591 | can. */ | |
3592 | ||
3593 | if (WIFSTOPPED (status)) | |
3594 | { | |
423ec54c | 3595 | enum target_signal signo = target_signal_from_host (WSTOPSIG (status)); |
d6b48e9c PA |
3596 | struct inferior *inf; |
3597 | ||
3598 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
3599 | gdb_assert (inf); | |
d6b0e80f | 3600 | |
d6b48e9c PA |
3601 | /* Defer to common code if we get a signal while |
3602 | single-stepping, since that may need special care, e.g. to | |
3603 | skip the signal handler, or, if we're gaining control of the | |
3604 | inferior. */ | |
d539ed7e | 3605 | if (!lp->step |
16c381f0 | 3606 | && inf->control.stop_soon == NO_STOP_QUIETLY |
d539ed7e | 3607 | && signal_stop_state (signo) == 0 |
d6b0e80f AC |
3608 | && signal_print_state (signo) == 0 |
3609 | && signal_pass_state (signo) == 1) | |
3610 | { | |
3611 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3612 | here? It is not clear we should. GDB may not expect | |
3613 | other threads to run. On the other hand, not resuming | |
3614 | newly attached threads may cause an unwanted delay in | |
3615 | getting them running. */ | |
3616 | registers_changed (); | |
28439f5e | 3617 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3618 | lp->step, signo); |
d6b0e80f AC |
3619 | if (debug_linux_nat) |
3620 | fprintf_unfiltered (gdb_stdlog, | |
3621 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3622 | lp->step ? | |
3623 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3624 | target_pid_to_str (lp->ptid), | |
423ec54c JK |
3625 | (signo != TARGET_SIGNAL_0 |
3626 | ? strsignal (target_signal_to_host (signo)) | |
3627 | : "0")); | |
d6b0e80f | 3628 | lp->stopped = 0; |
d6b0e80f AC |
3629 | goto retry; |
3630 | } | |
3631 | ||
1ad15515 | 3632 | if (!non_stop) |
d6b0e80f | 3633 | { |
1ad15515 PA |
3634 | /* Only do the below in all-stop, as we currently use SIGINT |
3635 | to implement target_stop (see linux_nat_stop) in | |
3636 | non-stop. */ | |
3637 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3638 | { | |
3639 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3640 | forwarded to the entire process group, that is, all LWPs | |
3641 | will receive it - unless they're using CLONE_THREAD to | |
3642 | share signals. Since we only want to report it once, we | |
3643 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3644 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3645 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3646 | lp->ignore_sigint = 0; |
3647 | } | |
3648 | else | |
3649 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3650 | } |
3651 | } | |
3652 | ||
3653 | /* This LWP is stopped now. */ | |
3654 | lp->stopped = 1; | |
3655 | ||
3656 | if (debug_linux_nat) | |
3657 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3658 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3659 | ||
4c28f408 PA |
3660 | if (!non_stop) |
3661 | { | |
3662 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3663 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3664 | |
3665 | /* ... and wait until all of them have reported back that | |
3666 | they're no longer running. */ | |
d90e17a7 | 3667 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3668 | |
3669 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3670 | from among those that have had events. Giving equal priority | |
3671 | to all LWPs that have had events helps prevent | |
3672 | starvation. */ | |
3673 | if (pid == -1) | |
d90e17a7 | 3674 | select_event_lwp (ptid, &lp, &status); |
d6b0e80f | 3675 | |
e3e9f5a2 PA |
3676 | /* Now that we've selected our final event LWP, cancel any |
3677 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
3678 | See the comment in cancel_breakpoints_callback to find out | |
3679 | why. */ | |
3680 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); | |
3681 | ||
3682 | /* In all-stop, from the core's perspective, all LWPs are now | |
3683 | stopped until a new resume action is sent over. */ | |
3684 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
3685 | } | |
3686 | else | |
3687 | lp->resumed = 0; | |
d6b0e80f | 3688 | |
26ab7092 | 3689 | if (linux_nat_status_is_event (status)) |
d6b0e80f | 3690 | { |
d6b0e80f AC |
3691 | if (debug_linux_nat) |
3692 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3693 | "LLW: trap ptid is %s.\n", |
3694 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3695 | } |
d6b0e80f AC |
3696 | |
3697 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3698 | { | |
3699 | *ourstatus = lp->waitstatus; | |
3700 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3701 | } | |
3702 | else | |
3703 | store_waitstatus (ourstatus, status); | |
3704 | ||
b84876c2 PA |
3705 | if (debug_linux_nat_async) |
3706 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); | |
3707 | ||
7feb7d06 | 3708 | restore_child_signals_mask (&prev_mask); |
1e225492 JK |
3709 | |
3710 | if (ourstatus->kind == TARGET_WAITKIND_EXITED | |
3711 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
3712 | lp->core = -1; | |
3713 | else | |
3714 | lp->core = linux_nat_core_of_thread_1 (lp->ptid); | |
3715 | ||
f973ed9c | 3716 | return lp->ptid; |
d6b0e80f AC |
3717 | } |
3718 | ||
e3e9f5a2 PA |
3719 | /* Resume LWPs that are currently stopped without any pending status |
3720 | to report, but are resumed from the core's perspective. */ | |
3721 | ||
3722 | static int | |
3723 | resume_stopped_resumed_lwps (struct lwp_info *lp, void *data) | |
3724 | { | |
3725 | ptid_t *wait_ptid_p = data; | |
3726 | ||
3727 | if (lp->stopped | |
3728 | && lp->resumed | |
3729 | && lp->status == 0 | |
3730 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
3731 | { | |
3732 | gdb_assert (is_executing (lp->ptid)); | |
3733 | ||
3734 | /* Don't bother if there's a breakpoint at PC that we'd hit | |
3735 | immediately, and we're not waiting for this LWP. */ | |
3736 | if (!ptid_match (lp->ptid, *wait_ptid_p)) | |
3737 | { | |
3738 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
3739 | CORE_ADDR pc = regcache_read_pc (regcache); | |
3740 | ||
3741 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3742 | return 0; | |
3743 | } | |
3744 | ||
3745 | if (debug_linux_nat) | |
3746 | fprintf_unfiltered (gdb_stdlog, | |
3747 | "RSRL: resuming stopped-resumed LWP %s\n", | |
3748 | target_pid_to_str (lp->ptid)); | |
3749 | ||
3750 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
3751 | lp->step, TARGET_SIGNAL_0); | |
3752 | lp->stopped = 0; | |
3753 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
3754 | lp->stopped_by_watchpoint = 0; | |
3755 | } | |
3756 | ||
3757 | return 0; | |
3758 | } | |
3759 | ||
7feb7d06 PA |
3760 | static ptid_t |
3761 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3762 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3763 | int target_options) | |
7feb7d06 PA |
3764 | { |
3765 | ptid_t event_ptid; | |
3766 | ||
3767 | if (debug_linux_nat) | |
3e43a32a MS |
3768 | fprintf_unfiltered (gdb_stdlog, |
3769 | "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
7feb7d06 PA |
3770 | |
3771 | /* Flush the async file first. */ | |
3772 | if (target_can_async_p ()) | |
3773 | async_file_flush (); | |
3774 | ||
e3e9f5a2 PA |
3775 | /* Resume LWPs that are currently stopped without any pending status |
3776 | to report, but are resumed from the core's perspective. LWPs get | |
3777 | in this state if we find them stopping at a time we're not | |
3778 | interested in reporting the event (target_wait on a | |
3779 | specific_process, for example, see linux_nat_wait_1), and | |
3780 | meanwhile the event became uninteresting. Don't bother resuming | |
3781 | LWPs we're not going to wait for if they'd stop immediately. */ | |
3782 | if (non_stop) | |
3783 | iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid); | |
3784 | ||
47608cb1 | 3785 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3786 | |
3787 | /* If we requested any event, and something came out, assume there | |
3788 | may be more. If we requested a specific lwp or process, also | |
3789 | assume there may be more. */ | |
3790 | if (target_can_async_p () | |
3791 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3792 | || !ptid_equal (ptid, minus_one_ptid))) | |
3793 | async_file_mark (); | |
3794 | ||
3795 | /* Get ready for the next event. */ | |
3796 | if (target_can_async_p ()) | |
3797 | target_async (inferior_event_handler, 0); | |
3798 | ||
3799 | return event_ptid; | |
3800 | } | |
3801 | ||
d6b0e80f AC |
3802 | static int |
3803 | kill_callback (struct lwp_info *lp, void *data) | |
3804 | { | |
3805 | errno = 0; | |
3806 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3807 | if (debug_linux_nat) | |
3808 | fprintf_unfiltered (gdb_stdlog, | |
3809 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3810 | target_pid_to_str (lp->ptid), | |
3811 | errno ? safe_strerror (errno) : "OK"); | |
3812 | ||
3813 | return 0; | |
3814 | } | |
3815 | ||
3816 | static int | |
3817 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3818 | { | |
3819 | pid_t pid; | |
3820 | ||
3821 | /* We must make sure that there are no pending events (delayed | |
3822 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3823 | program doesn't interfere with any following debugging session. */ | |
3824 | ||
3825 | /* For cloned processes we must check both with __WCLONE and | |
3826 | without, since the exit status of a cloned process isn't reported | |
3827 | with __WCLONE. */ | |
3828 | if (lp->cloned) | |
3829 | { | |
3830 | do | |
3831 | { | |
58aecb61 | 3832 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3833 | if (pid != (pid_t) -1) |
d6b0e80f | 3834 | { |
e85a822c DJ |
3835 | if (debug_linux_nat) |
3836 | fprintf_unfiltered (gdb_stdlog, | |
3837 | "KWC: wait %s received unknown.\n", | |
3838 | target_pid_to_str (lp->ptid)); | |
3839 | /* The Linux kernel sometimes fails to kill a thread | |
3840 | completely after PTRACE_KILL; that goes from the stop | |
3841 | point in do_fork out to the one in | |
3842 | get_signal_to_deliever and waits again. So kill it | |
3843 | again. */ | |
3844 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3845 | } |
3846 | } | |
3847 | while (pid == GET_LWP (lp->ptid)); | |
3848 | ||
3849 | gdb_assert (pid == -1 && errno == ECHILD); | |
3850 | } | |
3851 | ||
3852 | do | |
3853 | { | |
58aecb61 | 3854 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3855 | if (pid != (pid_t) -1) |
d6b0e80f | 3856 | { |
e85a822c DJ |
3857 | if (debug_linux_nat) |
3858 | fprintf_unfiltered (gdb_stdlog, | |
3859 | "KWC: wait %s received unk.\n", | |
3860 | target_pid_to_str (lp->ptid)); | |
3861 | /* See the call to kill_callback above. */ | |
3862 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3863 | } |
3864 | } | |
3865 | while (pid == GET_LWP (lp->ptid)); | |
3866 | ||
3867 | gdb_assert (pid == -1 && errno == ECHILD); | |
3868 | return 0; | |
3869 | } | |
3870 | ||
3871 | static void | |
7d85a9c0 | 3872 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3873 | { |
f973ed9c DJ |
3874 | struct target_waitstatus last; |
3875 | ptid_t last_ptid; | |
3876 | int status; | |
d6b0e80f | 3877 | |
f973ed9c DJ |
3878 | /* If we're stopped while forking and we haven't followed yet, |
3879 | kill the other task. We need to do this first because the | |
3880 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3881 | |
f973ed9c | 3882 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3883 | |
f973ed9c DJ |
3884 | if (last.kind == TARGET_WAITKIND_FORKED |
3885 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3886 | { | |
3a3e9ee3 | 3887 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3888 | wait (&status); |
3889 | } | |
3890 | ||
3891 | if (forks_exist_p ()) | |
7feb7d06 | 3892 | linux_fork_killall (); |
f973ed9c DJ |
3893 | else |
3894 | { | |
d90e17a7 | 3895 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
e0881a8e | 3896 | |
4c28f408 PA |
3897 | /* Stop all threads before killing them, since ptrace requires |
3898 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3899 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3900 | /* ... and wait until all of them have reported back that |
3901 | they're no longer running. */ | |
d90e17a7 | 3902 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3903 | |
f973ed9c | 3904 | /* Kill all LWP's ... */ |
d90e17a7 | 3905 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3906 | |
3907 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3908 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3909 | } |
3910 | ||
3911 | target_mourn_inferior (); | |
d6b0e80f AC |
3912 | } |
3913 | ||
3914 | static void | |
136d6dae | 3915 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3916 | { |
d90e17a7 | 3917 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 3918 | |
f973ed9c | 3919 | if (! forks_exist_p ()) |
d90e17a7 PA |
3920 | /* Normal case, no other forks available. */ |
3921 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3922 | else |
3923 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3924 | there are other viable forks to debug. Delete the exiting | |
3925 | one and context-switch to the first available. */ | |
3926 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3927 | } |
3928 | ||
5b009018 PA |
3929 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3930 | layout of the inferiors' architecture. */ | |
3931 | ||
3932 | static void | |
3933 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
3934 | { | |
3935 | int done = 0; | |
3936 | ||
3937 | if (linux_nat_siginfo_fixup != NULL) | |
3938 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3939 | ||
3940 | /* If there was no callback, or the callback didn't do anything, | |
3941 | then just do a straight memcpy. */ | |
3942 | if (!done) | |
3943 | { | |
3944 | if (direction == 1) | |
3945 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3946 | else | |
3947 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3948 | } | |
3949 | } | |
3950 | ||
4aa995e1 PA |
3951 | static LONGEST |
3952 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
3953 | const char *annex, gdb_byte *readbuf, | |
3954 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3955 | { | |
4aa995e1 PA |
3956 | int pid; |
3957 | struct siginfo siginfo; | |
5b009018 | 3958 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3959 | |
3960 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3961 | gdb_assert (readbuf || writebuf); | |
3962 | ||
3963 | pid = GET_LWP (inferior_ptid); | |
3964 | if (pid == 0) | |
3965 | pid = GET_PID (inferior_ptid); | |
3966 | ||
3967 | if (offset > sizeof (siginfo)) | |
3968 | return -1; | |
3969 | ||
3970 | errno = 0; | |
3971 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3972 | if (errno != 0) | |
3973 | return -1; | |
3974 | ||
5b009018 PA |
3975 | /* When GDB is built as a 64-bit application, ptrace writes into |
3976 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3977 | inferior with a 64-bit GDB should look the same as debugging it | |
3978 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3979 | the converted layout, so any read/write will have to be done | |
3980 | post-conversion. */ | |
3981 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3982 | ||
4aa995e1 PA |
3983 | if (offset + len > sizeof (siginfo)) |
3984 | len = sizeof (siginfo) - offset; | |
3985 | ||
3986 | if (readbuf != NULL) | |
5b009018 | 3987 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3988 | else |
3989 | { | |
5b009018 PA |
3990 | memcpy (inf_siginfo + offset, writebuf, len); |
3991 | ||
3992 | /* Convert back to ptrace layout before flushing it out. */ | |
3993 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3994 | ||
4aa995e1 PA |
3995 | errno = 0; |
3996 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3997 | if (errno != 0) | |
3998 | return -1; | |
3999 | } | |
4000 | ||
4001 | return len; | |
4002 | } | |
4003 | ||
10d6c8cd DJ |
4004 | static LONGEST |
4005 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
4006 | const char *annex, gdb_byte *readbuf, | |
4007 | const gdb_byte *writebuf, | |
4008 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 4009 | { |
4aa995e1 | 4010 | struct cleanup *old_chain; |
10d6c8cd | 4011 | LONGEST xfer; |
d6b0e80f | 4012 | |
4aa995e1 PA |
4013 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
4014 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
4015 | offset, len); | |
4016 | ||
c35b1492 PA |
4017 | /* The target is connected but no live inferior is selected. Pass |
4018 | this request down to a lower stratum (e.g., the executable | |
4019 | file). */ | |
4020 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
4021 | return 0; | |
4022 | ||
4aa995e1 PA |
4023 | old_chain = save_inferior_ptid (); |
4024 | ||
d6b0e80f AC |
4025 | if (is_lwp (inferior_ptid)) |
4026 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
4027 | ||
10d6c8cd DJ |
4028 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
4029 | offset, len); | |
d6b0e80f AC |
4030 | |
4031 | do_cleanups (old_chain); | |
4032 | return xfer; | |
4033 | } | |
4034 | ||
4035 | static int | |
28439f5e | 4036 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 4037 | { |
4c28f408 PA |
4038 | int err; |
4039 | ||
d6b0e80f AC |
4040 | gdb_assert (is_lwp (ptid)); |
4041 | ||
4c28f408 PA |
4042 | /* Send signal 0 instead of anything ptrace, because ptracing a |
4043 | running thread errors out claiming that the thread doesn't | |
4044 | exist. */ | |
4045 | err = kill_lwp (GET_LWP (ptid), 0); | |
4046 | ||
d6b0e80f AC |
4047 | if (debug_linux_nat) |
4048 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 4049 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 4050 | target_pid_to_str (ptid), |
4c28f408 | 4051 | err ? safe_strerror (err) : "OK"); |
9c0dd46b | 4052 | |
4c28f408 | 4053 | if (err != 0) |
d6b0e80f AC |
4054 | return 0; |
4055 | ||
4056 | return 1; | |
4057 | } | |
4058 | ||
28439f5e PA |
4059 | static int |
4060 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
4061 | { | |
4062 | return linux_thread_alive (ptid); | |
4063 | } | |
4064 | ||
d6b0e80f | 4065 | static char * |
117de6a9 | 4066 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
4067 | { |
4068 | static char buf[64]; | |
4069 | ||
a0ef4274 | 4070 | if (is_lwp (ptid) |
d90e17a7 PA |
4071 | && (GET_PID (ptid) != GET_LWP (ptid) |
4072 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
4073 | { |
4074 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
4075 | return buf; | |
4076 | } | |
4077 | ||
4078 | return normal_pid_to_str (ptid); | |
4079 | } | |
4080 | ||
4694da01 TT |
4081 | static char * |
4082 | linux_nat_thread_name (struct thread_info *thr) | |
4083 | { | |
4084 | int pid = ptid_get_pid (thr->ptid); | |
4085 | long lwp = ptid_get_lwp (thr->ptid); | |
4086 | #define FORMAT "/proc/%d/task/%ld/comm" | |
4087 | char buf[sizeof (FORMAT) + 30]; | |
4088 | FILE *comm_file; | |
4089 | char *result = NULL; | |
4090 | ||
4091 | snprintf (buf, sizeof (buf), FORMAT, pid, lwp); | |
4092 | comm_file = fopen (buf, "r"); | |
4093 | if (comm_file) | |
4094 | { | |
4095 | /* Not exported by the kernel, so we define it here. */ | |
4096 | #define COMM_LEN 16 | |
4097 | static char line[COMM_LEN + 1]; | |
4098 | ||
4099 | if (fgets (line, sizeof (line), comm_file)) | |
4100 | { | |
4101 | char *nl = strchr (line, '\n'); | |
4102 | ||
4103 | if (nl) | |
4104 | *nl = '\0'; | |
4105 | if (*line != '\0') | |
4106 | result = line; | |
4107 | } | |
4108 | ||
4109 | fclose (comm_file); | |
4110 | } | |
4111 | ||
4112 | #undef COMM_LEN | |
4113 | #undef FORMAT | |
4114 | ||
4115 | return result; | |
4116 | } | |
4117 | ||
dba24537 AC |
4118 | /* Accepts an integer PID; Returns a string representing a file that |
4119 | can be opened to get the symbols for the child process. */ | |
4120 | ||
6d8fd2b7 UW |
4121 | static char * |
4122 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
4123 | { |
4124 | char *name1, *name2; | |
4125 | ||
4126 | name1 = xmalloc (MAXPATHLEN); | |
4127 | name2 = xmalloc (MAXPATHLEN); | |
4128 | make_cleanup (xfree, name1); | |
4129 | make_cleanup (xfree, name2); | |
4130 | memset (name2, 0, MAXPATHLEN); | |
4131 | ||
4132 | sprintf (name1, "/proc/%d/exe", pid); | |
4133 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
4134 | return name2; | |
4135 | else | |
4136 | return name1; | |
4137 | } | |
4138 | ||
4139 | /* Service function for corefiles and info proc. */ | |
4140 | ||
4141 | static int | |
4142 | read_mapping (FILE *mapfile, | |
4143 | long long *addr, | |
4144 | long long *endaddr, | |
4145 | char *permissions, | |
4146 | long long *offset, | |
4147 | char *device, long long *inode, char *filename) | |
4148 | { | |
4149 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
4150 | addr, endaddr, permissions, offset, device, inode); | |
4151 | ||
2e14c2ea MS |
4152 | filename[0] = '\0'; |
4153 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
4154 | { |
4155 | /* Eat everything up to EOL for the filename. This will prevent | |
4156 | weird filenames (such as one with embedded whitespace) from | |
4157 | confusing this code. It also makes this code more robust in | |
4158 | respect to annotations the kernel may add after the filename. | |
4159 | ||
4160 | Note the filename is used for informational purposes | |
4161 | only. */ | |
4162 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
4163 | } | |
2e14c2ea | 4164 | |
dba24537 AC |
4165 | return (ret != 0 && ret != EOF); |
4166 | } | |
4167 | ||
4168 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
4169 | regions in the inferior for a corefile. */ | |
4170 | ||
4171 | static int | |
b8edc417 | 4172 | linux_nat_find_memory_regions (find_memory_region_ftype func, void *obfd) |
dba24537 | 4173 | { |
89ecc4f5 | 4174 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
4175 | char mapsfilename[MAXPATHLEN]; |
4176 | FILE *mapsfile; | |
4177 | long long addr, endaddr, size, offset, inode; | |
4178 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
4179 | int read, write, exec; | |
7c8a8b04 | 4180 | struct cleanup *cleanup; |
dba24537 AC |
4181 | |
4182 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 4183 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 4184 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 4185 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 4186 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
4187 | |
4188 | if (info_verbose) | |
4189 | fprintf_filtered (gdb_stdout, | |
4190 | "Reading memory regions from %s\n", mapsfilename); | |
4191 | ||
4192 | /* Now iterate until end-of-file. */ | |
4193 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
4194 | &offset, &device[0], &inode, &filename[0])) | |
4195 | { | |
4196 | size = endaddr - addr; | |
4197 | ||
4198 | /* Get the segment's permissions. */ | |
4199 | read = (strchr (permissions, 'r') != 0); | |
4200 | write = (strchr (permissions, 'w') != 0); | |
4201 | exec = (strchr (permissions, 'x') != 0); | |
4202 | ||
4203 | if (info_verbose) | |
4204 | { | |
4205 | fprintf_filtered (gdb_stdout, | |
2244ba2e PM |
4206 | "Save segment, %s bytes at %s (%c%c%c)", |
4207 | plongest (size), paddress (target_gdbarch, addr), | |
dba24537 AC |
4208 | read ? 'r' : ' ', |
4209 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 4210 | if (filename[0]) |
dba24537 AC |
4211 | fprintf_filtered (gdb_stdout, " for %s", filename); |
4212 | fprintf_filtered (gdb_stdout, "\n"); | |
4213 | } | |
4214 | ||
4215 | /* Invoke the callback function to create the corefile | |
4216 | segment. */ | |
4217 | func (addr, size, read, write, exec, obfd); | |
4218 | } | |
7c8a8b04 | 4219 | do_cleanups (cleanup); |
dba24537 AC |
4220 | return 0; |
4221 | } | |
4222 | ||
2020b7ab PA |
4223 | static int |
4224 | find_signalled_thread (struct thread_info *info, void *data) | |
4225 | { | |
16c381f0 | 4226 | if (info->suspend.stop_signal != TARGET_SIGNAL_0 |
2020b7ab PA |
4227 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) |
4228 | return 1; | |
4229 | ||
4230 | return 0; | |
4231 | } | |
4232 | ||
4233 | static enum target_signal | |
4234 | find_stop_signal (void) | |
4235 | { | |
4236 | struct thread_info *info = | |
4237 | iterate_over_threads (find_signalled_thread, NULL); | |
4238 | ||
4239 | if (info) | |
16c381f0 | 4240 | return info->suspend.stop_signal; |
2020b7ab PA |
4241 | else |
4242 | return TARGET_SIGNAL_0; | |
4243 | } | |
4244 | ||
dba24537 AC |
4245 | /* Records the thread's register state for the corefile note |
4246 | section. */ | |
4247 | ||
4248 | static char * | |
4249 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
4250 | char *note_data, int *note_size, |
4251 | enum target_signal stop_signal) | |
dba24537 | 4252 | { |
dba24537 | 4253 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
4254 | struct gdbarch *gdbarch = target_gdbarch; |
4255 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 4256 | const struct regset *regset; |
55e969c1 | 4257 | int core_regset_p; |
594f7785 | 4258 | struct cleanup *old_chain; |
17ea7499 CES |
4259 | struct core_regset_section *sect_list; |
4260 | char *gdb_regset; | |
594f7785 UW |
4261 | |
4262 | old_chain = save_inferior_ptid (); | |
4263 | inferior_ptid = ptid; | |
4264 | target_fetch_registers (regcache, -1); | |
4265 | do_cleanups (old_chain); | |
4f844a66 DM |
4266 | |
4267 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
4268 | sect_list = gdbarch_core_regset_sections (gdbarch); |
4269 | ||
17ea7499 CES |
4270 | /* The loop below uses the new struct core_regset_section, which stores |
4271 | the supported section names and sizes for the core file. Note that | |
4272 | note PRSTATUS needs to be treated specially. But the other notes are | |
4273 | structurally the same, so they can benefit from the new struct. */ | |
4274 | if (core_regset_p && sect_list != NULL) | |
4275 | while (sect_list->sect_name != NULL) | |
4276 | { | |
17ea7499 CES |
4277 | regset = gdbarch_regset_from_core_section (gdbarch, |
4278 | sect_list->sect_name, | |
4279 | sect_list->size); | |
4280 | gdb_assert (regset && regset->collect_regset); | |
4281 | gdb_regset = xmalloc (sect_list->size); | |
4282 | regset->collect_regset (regset, regcache, -1, | |
4283 | gdb_regset, sect_list->size); | |
2f2241f1 UW |
4284 | |
4285 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
4286 | note_data = (char *) elfcore_write_prstatus | |
4287 | (obfd, note_data, note_size, | |
857d11d0 JK |
4288 | lwp, target_signal_to_host (stop_signal), |
4289 | gdb_regset); | |
2f2241f1 UW |
4290 | else |
4291 | note_data = (char *) elfcore_write_register_note | |
4292 | (obfd, note_data, note_size, | |
4293 | sect_list->sect_name, gdb_regset, | |
4294 | sect_list->size); | |
17ea7499 CES |
4295 | xfree (gdb_regset); |
4296 | sect_list++; | |
4297 | } | |
dba24537 | 4298 | |
17ea7499 CES |
4299 | /* For architectures that does not have the struct core_regset_section |
4300 | implemented, we use the old method. When all the architectures have | |
4301 | the new support, the code below should be deleted. */ | |
4f844a66 | 4302 | else |
17ea7499 | 4303 | { |
2f2241f1 UW |
4304 | gdb_gregset_t gregs; |
4305 | gdb_fpregset_t fpregs; | |
4306 | ||
4307 | if (core_regset_p | |
4308 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3e43a32a MS |
4309 | sizeof (gregs))) |
4310 | != NULL && regset->collect_regset != NULL) | |
2f2241f1 UW |
4311 | regset->collect_regset (regset, regcache, -1, |
4312 | &gregs, sizeof (gregs)); | |
4313 | else | |
4314 | fill_gregset (regcache, &gregs, -1); | |
4315 | ||
857d11d0 JK |
4316 | note_data = (char *) elfcore_write_prstatus |
4317 | (obfd, note_data, note_size, lwp, target_signal_to_host (stop_signal), | |
4318 | &gregs); | |
2f2241f1 | 4319 | |
17ea7499 CES |
4320 | if (core_regset_p |
4321 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3e43a32a MS |
4322 | sizeof (fpregs))) |
4323 | != NULL && regset->collect_regset != NULL) | |
17ea7499 CES |
4324 | regset->collect_regset (regset, regcache, -1, |
4325 | &fpregs, sizeof (fpregs)); | |
4326 | else | |
4327 | fill_fpregset (regcache, &fpregs, -1); | |
4328 | ||
4329 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
4330 | note_data, | |
4331 | note_size, | |
4332 | &fpregs, sizeof (fpregs)); | |
4333 | } | |
4f844a66 | 4334 | |
dba24537 AC |
4335 | return note_data; |
4336 | } | |
4337 | ||
4338 | struct linux_nat_corefile_thread_data | |
4339 | { | |
4340 | bfd *obfd; | |
4341 | char *note_data; | |
4342 | int *note_size; | |
4343 | int num_notes; | |
2020b7ab | 4344 | enum target_signal stop_signal; |
dba24537 AC |
4345 | }; |
4346 | ||
4347 | /* Called by gdbthread.c once per thread. Records the thread's | |
4348 | register state for the corefile note section. */ | |
4349 | ||
4350 | static int | |
4351 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
4352 | { | |
4353 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 4354 | |
dba24537 AC |
4355 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
4356 | ti->ptid, | |
4357 | args->note_data, | |
2020b7ab PA |
4358 | args->note_size, |
4359 | args->stop_signal); | |
dba24537 | 4360 | args->num_notes++; |
56be3814 | 4361 | |
dba24537 AC |
4362 | return 0; |
4363 | } | |
4364 | ||
efcbbd14 UW |
4365 | /* Enumerate spufs IDs for process PID. */ |
4366 | ||
4367 | static void | |
4368 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
4369 | { | |
4370 | char path[128]; | |
4371 | DIR *dir; | |
4372 | struct dirent *entry; | |
4373 | ||
4374 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4375 | dir = opendir (path); | |
4376 | if (!dir) | |
4377 | return; | |
4378 | ||
4379 | rewinddir (dir); | |
4380 | while ((entry = readdir (dir)) != NULL) | |
4381 | { | |
4382 | struct stat st; | |
4383 | struct statfs stfs; | |
4384 | int fd; | |
4385 | ||
4386 | fd = atoi (entry->d_name); | |
4387 | if (!fd) | |
4388 | continue; | |
4389 | ||
4390 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4391 | if (stat (path, &st) != 0) | |
4392 | continue; | |
4393 | if (!S_ISDIR (st.st_mode)) | |
4394 | continue; | |
4395 | ||
4396 | if (statfs (path, &stfs) != 0) | |
4397 | continue; | |
4398 | if (stfs.f_type != SPUFS_MAGIC) | |
4399 | continue; | |
4400 | ||
4401 | callback (data, fd); | |
4402 | } | |
4403 | ||
4404 | closedir (dir); | |
4405 | } | |
4406 | ||
4407 | /* Generate corefile notes for SPU contexts. */ | |
4408 | ||
4409 | struct linux_spu_corefile_data | |
4410 | { | |
4411 | bfd *obfd; | |
4412 | char *note_data; | |
4413 | int *note_size; | |
4414 | }; | |
4415 | ||
4416 | static void | |
4417 | linux_spu_corefile_callback (void *data, int fd) | |
4418 | { | |
4419 | struct linux_spu_corefile_data *args = data; | |
4420 | int i; | |
4421 | ||
4422 | static const char *spu_files[] = | |
4423 | { | |
4424 | "object-id", | |
4425 | "mem", | |
4426 | "regs", | |
4427 | "fpcr", | |
4428 | "lslr", | |
4429 | "decr", | |
4430 | "decr_status", | |
4431 | "signal1", | |
4432 | "signal1_type", | |
4433 | "signal2", | |
4434 | "signal2_type", | |
4435 | "event_mask", | |
4436 | "event_status", | |
4437 | "mbox_info", | |
4438 | "ibox_info", | |
4439 | "wbox_info", | |
4440 | "dma_info", | |
4441 | "proxydma_info", | |
4442 | }; | |
4443 | ||
4444 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
4445 | { | |
4446 | char annex[32], note_name[32]; | |
4447 | gdb_byte *spu_data; | |
4448 | LONGEST spu_len; | |
4449 | ||
4450 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
4451 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
4452 | annex, &spu_data); | |
4453 | if (spu_len > 0) | |
4454 | { | |
4455 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
4456 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
4457 | args->note_size, note_name, | |
4458 | NT_SPU, spu_data, spu_len); | |
4459 | xfree (spu_data); | |
4460 | } | |
4461 | } | |
4462 | } | |
4463 | ||
4464 | static char * | |
4465 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
4466 | { | |
4467 | struct linux_spu_corefile_data args; | |
e0881a8e | 4468 | |
efcbbd14 UW |
4469 | args.obfd = obfd; |
4470 | args.note_data = note_data; | |
4471 | args.note_size = note_size; | |
4472 | ||
4473 | iterate_over_spus (PIDGET (inferior_ptid), | |
4474 | linux_spu_corefile_callback, &args); | |
4475 | ||
4476 | return args.note_data; | |
4477 | } | |
4478 | ||
dba24537 AC |
4479 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
4480 | section for a corefile, and returns it in a malloc buffer. */ | |
4481 | ||
4482 | static char * | |
4483 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
4484 | { | |
4485 | struct linux_nat_corefile_thread_data thread_args; | |
d99148ef | 4486 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 4487 | char fname[16] = { '\0' }; |
d99148ef | 4488 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
4489 | char psargs[80] = { '\0' }; |
4490 | char *note_data = NULL; | |
d90e17a7 | 4491 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 4492 | gdb_byte *auxv; |
dba24537 AC |
4493 | int auxv_len; |
4494 | ||
4495 | if (get_exec_file (0)) | |
4496 | { | |
4497 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
4498 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
4499 | if (get_inferior_args ()) | |
4500 | { | |
d99148ef JK |
4501 | char *string_end; |
4502 | char *psargs_end = psargs + sizeof (psargs); | |
4503 | ||
4504 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
4505 | strings fine. */ | |
4506 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
4507 | if (string_end != NULL) | |
4508 | { | |
4509 | *string_end++ = ' '; | |
4510 | strncpy (string_end, get_inferior_args (), | |
4511 | psargs_end - string_end); | |
4512 | } | |
dba24537 AC |
4513 | } |
4514 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
4515 | note_data, | |
4516 | note_size, fname, psargs); | |
4517 | } | |
4518 | ||
4519 | /* Dump information for threads. */ | |
4520 | thread_args.obfd = obfd; | |
4521 | thread_args.note_data = note_data; | |
4522 | thread_args.note_size = note_size; | |
4523 | thread_args.num_notes = 0; | |
2020b7ab | 4524 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 4525 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
4526 | gdb_assert (thread_args.num_notes != 0); |
4527 | note_data = thread_args.note_data; | |
dba24537 | 4528 | |
13547ab6 DJ |
4529 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
4530 | NULL, &auxv); | |
dba24537 AC |
4531 | if (auxv_len > 0) |
4532 | { | |
4533 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
4534 | "CORE", NT_AUXV, auxv, auxv_len); | |
4535 | xfree (auxv); | |
4536 | } | |
4537 | ||
efcbbd14 UW |
4538 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
4539 | ||
dba24537 AC |
4540 | make_cleanup (xfree, note_data); |
4541 | return note_data; | |
4542 | } | |
4543 | ||
4544 | /* Implement the "info proc" command. */ | |
4545 | ||
4546 | static void | |
4547 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
4548 | { | |
89ecc4f5 DE |
4549 | /* A long is used for pid instead of an int to avoid a loss of precision |
4550 | compiler warning from the output of strtoul. */ | |
4551 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
4552 | FILE *procfile; |
4553 | char **argv = NULL; | |
4554 | char buffer[MAXPATHLEN]; | |
4555 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
4556 | int cmdline_f = 1; | |
4557 | int cwd_f = 1; | |
4558 | int exe_f = 1; | |
4559 | int mappings_f = 0; | |
dba24537 AC |
4560 | int status_f = 0; |
4561 | int stat_f = 0; | |
4562 | int all = 0; | |
4563 | struct stat dummy; | |
4564 | ||
4565 | if (args) | |
4566 | { | |
4567 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
4568 | argv = gdb_buildargv (args); |
4569 | make_cleanup_freeargv (argv); | |
dba24537 AC |
4570 | } |
4571 | while (argv != NULL && *argv != NULL) | |
4572 | { | |
4573 | if (isdigit (argv[0][0])) | |
4574 | { | |
4575 | pid = strtoul (argv[0], NULL, 10); | |
4576 | } | |
4577 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
4578 | { | |
4579 | mappings_f = 1; | |
4580 | } | |
4581 | else if (strcmp (argv[0], "status") == 0) | |
4582 | { | |
4583 | status_f = 1; | |
4584 | } | |
4585 | else if (strcmp (argv[0], "stat") == 0) | |
4586 | { | |
4587 | stat_f = 1; | |
4588 | } | |
4589 | else if (strcmp (argv[0], "cmd") == 0) | |
4590 | { | |
4591 | cmdline_f = 1; | |
4592 | } | |
4593 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
4594 | { | |
4595 | exe_f = 1; | |
4596 | } | |
4597 | else if (strcmp (argv[0], "cwd") == 0) | |
4598 | { | |
4599 | cwd_f = 1; | |
4600 | } | |
4601 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
4602 | { | |
4603 | all = 1; | |
4604 | } | |
4605 | else | |
4606 | { | |
1777feb0 | 4607 | /* [...] (future options here). */ |
dba24537 AC |
4608 | } |
4609 | argv++; | |
4610 | } | |
4611 | if (pid == 0) | |
8a3fe4f8 | 4612 | error (_("No current process: you must name one.")); |
dba24537 | 4613 | |
89ecc4f5 | 4614 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4615 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4616 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4617 | |
89ecc4f5 | 4618 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
4619 | if (cmdline_f || all) |
4620 | { | |
89ecc4f5 | 4621 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4622 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4623 | { |
7c8a8b04 | 4624 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4625 | |
bf1d7d9c JB |
4626 | if (fgets (buffer, sizeof (buffer), procfile)) |
4627 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4628 | else | |
4629 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4630 | do_cleanups (cleanup); |
dba24537 AC |
4631 | } |
4632 | else | |
8a3fe4f8 | 4633 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4634 | } |
4635 | if (cwd_f || all) | |
4636 | { | |
89ecc4f5 | 4637 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4638 | memset (fname2, 0, sizeof (fname2)); |
4639 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4640 | printf_filtered ("cwd = '%s'\n", fname2); | |
4641 | else | |
8a3fe4f8 | 4642 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4643 | } |
4644 | if (exe_f || all) | |
4645 | { | |
89ecc4f5 | 4646 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4647 | memset (fname2, 0, sizeof (fname2)); |
4648 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4649 | printf_filtered ("exe = '%s'\n", fname2); | |
4650 | else | |
8a3fe4f8 | 4651 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4652 | } |
4653 | if (mappings_f || all) | |
4654 | { | |
89ecc4f5 | 4655 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4656 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4657 | { |
4658 | long long addr, endaddr, size, offset, inode; | |
4659 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4660 | struct cleanup *cleanup; |
dba24537 | 4661 | |
7c8a8b04 | 4662 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4663 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4664 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4665 | { |
4666 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4667 | "Start Addr", | |
4668 | " End Addr", | |
4669 | " Size", " Offset", "objfile"); | |
4670 | } | |
4671 | else | |
4672 | { | |
4673 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4674 | "Start Addr", | |
4675 | " End Addr", | |
4676 | " Size", " Offset", "objfile"); | |
4677 | } | |
4678 | ||
4679 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4680 | &offset, &device[0], &inode, &filename[0])) | |
4681 | { | |
4682 | size = endaddr - addr; | |
4683 | ||
4684 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4685 | calls here (and possibly above) should be abstracted | |
4686 | out into their own functions? Andrew suggests using | |
4687 | a generic local_address_string instead to print out | |
4688 | the addresses; that makes sense to me, too. */ | |
4689 | ||
a97b0ac8 | 4690 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4691 | { |
4692 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4693 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4694 | (unsigned long) endaddr, | |
4695 | (int) size, | |
4696 | (unsigned int) offset, | |
4697 | filename[0] ? filename : ""); | |
4698 | } | |
4699 | else | |
4700 | { | |
4701 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4702 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4703 | (unsigned long) endaddr, | |
4704 | (int) size, | |
4705 | (unsigned int) offset, | |
4706 | filename[0] ? filename : ""); | |
4707 | } | |
4708 | } | |
4709 | ||
7c8a8b04 | 4710 | do_cleanups (cleanup); |
dba24537 AC |
4711 | } |
4712 | else | |
8a3fe4f8 | 4713 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4714 | } |
4715 | if (status_f || all) | |
4716 | { | |
89ecc4f5 | 4717 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4718 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4719 | { |
7c8a8b04 | 4720 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4721 | |
dba24537 AC |
4722 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4723 | puts_filtered (buffer); | |
7c8a8b04 | 4724 | do_cleanups (cleanup); |
dba24537 AC |
4725 | } |
4726 | else | |
8a3fe4f8 | 4727 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4728 | } |
4729 | if (stat_f || all) | |
4730 | { | |
89ecc4f5 | 4731 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4732 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4733 | { |
4734 | int itmp; | |
4735 | char ctmp; | |
a25694b4 | 4736 | long ltmp; |
7c8a8b04 | 4737 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4738 | |
4739 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4740 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4741 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4742 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4743 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4744 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4745 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4746 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4747 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4748 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4749 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4750 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4751 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4752 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4753 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4754 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4755 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4756 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4757 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4758 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4759 | (unsigned long) ltmp); | |
4760 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4761 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4762 | (unsigned long) ltmp); | |
4763 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4764 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4765 | (unsigned long) ltmp); | |
4766 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4767 | printf_filtered (_("Major faults, children: %lu\n"), | |
4768 | (unsigned long) ltmp); | |
4769 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4770 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4771 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4772 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4773 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4774 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4775 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4776 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4777 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4778 | printf_filtered (_("jiffies remaining in current " |
4779 | "time slice: %ld\n"), ltmp); | |
a25694b4 AS |
4780 | if (fscanf (procfile, "%ld ", <mp) > 0) |
4781 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4782 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4783 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4784 | (unsigned long) ltmp); | |
4785 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4786 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4787 | (unsigned long) ltmp); | |
4788 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4789 | printf_filtered (_("start time (jiffies since " |
4790 | "system boot): %ld\n"), ltmp); | |
a25694b4 AS |
4791 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4792 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4793 | (unsigned long) ltmp); | |
4794 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3e43a32a MS |
4795 | printf_filtered (_("Resident set size: %lu\n"), |
4796 | (unsigned long) ltmp); | |
a25694b4 AS |
4797 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4798 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4799 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4800 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4801 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4802 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4803 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4804 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
3e43a32a MS |
4805 | #if 0 /* Don't know how architecture-dependent the rest is... |
4806 | Anyway the signal bitmap info is available from "status". */ | |
1777feb0 | 4807 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4808 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); |
1777feb0 | 4809 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 AS |
4810 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); |
4811 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4812 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
4813 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4814 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
4815 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4816 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
4817 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4818 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
1777feb0 | 4819 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4820 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); |
dba24537 | 4821 | #endif |
7c8a8b04 | 4822 | do_cleanups (cleanup); |
dba24537 AC |
4823 | } |
4824 | else | |
8a3fe4f8 | 4825 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4826 | } |
4827 | } | |
4828 | ||
10d6c8cd DJ |
4829 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
4830 | filesystem. Because we can use a single read() call for /proc, this | |
4831 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
4832 | but it doesn't support writes. */ | |
4833 | ||
4834 | static LONGEST | |
4835 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
4836 | const char *annex, gdb_byte *readbuf, | |
4837 | const gdb_byte *writebuf, | |
4838 | ULONGEST offset, LONGEST len) | |
dba24537 | 4839 | { |
10d6c8cd DJ |
4840 | LONGEST ret; |
4841 | int fd; | |
dba24537 AC |
4842 | char filename[64]; |
4843 | ||
10d6c8cd | 4844 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
4845 | return 0; |
4846 | ||
4847 | /* Don't bother for one word. */ | |
4848 | if (len < 3 * sizeof (long)) | |
4849 | return 0; | |
4850 | ||
4851 | /* We could keep this file open and cache it - possibly one per | |
4852 | thread. That requires some juggling, but is even faster. */ | |
4853 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
4854 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
4855 | if (fd == -1) | |
4856 | return 0; | |
4857 | ||
4858 | /* If pread64 is available, use it. It's faster if the kernel | |
4859 | supports it (only one syscall), and it's 64-bit safe even on | |
4860 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4861 | application). */ | |
4862 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4863 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4864 | #else |
10d6c8cd | 4865 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4866 | #endif |
4867 | ret = 0; | |
4868 | else | |
4869 | ret = len; | |
4870 | ||
4871 | close (fd); | |
4872 | return ret; | |
4873 | } | |
4874 | ||
efcbbd14 UW |
4875 | |
4876 | /* Enumerate spufs IDs for process PID. */ | |
4877 | static LONGEST | |
4878 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
4879 | { | |
4880 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
4881 | LONGEST pos = 0; | |
4882 | LONGEST written = 0; | |
4883 | char path[128]; | |
4884 | DIR *dir; | |
4885 | struct dirent *entry; | |
4886 | ||
4887 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4888 | dir = opendir (path); | |
4889 | if (!dir) | |
4890 | return -1; | |
4891 | ||
4892 | rewinddir (dir); | |
4893 | while ((entry = readdir (dir)) != NULL) | |
4894 | { | |
4895 | struct stat st; | |
4896 | struct statfs stfs; | |
4897 | int fd; | |
4898 | ||
4899 | fd = atoi (entry->d_name); | |
4900 | if (!fd) | |
4901 | continue; | |
4902 | ||
4903 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4904 | if (stat (path, &st) != 0) | |
4905 | continue; | |
4906 | if (!S_ISDIR (st.st_mode)) | |
4907 | continue; | |
4908 | ||
4909 | if (statfs (path, &stfs) != 0) | |
4910 | continue; | |
4911 | if (stfs.f_type != SPUFS_MAGIC) | |
4912 | continue; | |
4913 | ||
4914 | if (pos >= offset && pos + 4 <= offset + len) | |
4915 | { | |
4916 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
4917 | written += 4; | |
4918 | } | |
4919 | pos += 4; | |
4920 | } | |
4921 | ||
4922 | closedir (dir); | |
4923 | return written; | |
4924 | } | |
4925 | ||
4926 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4927 | object type, using the /proc file system. */ | |
4928 | static LONGEST | |
4929 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
4930 | const char *annex, gdb_byte *readbuf, | |
4931 | const gdb_byte *writebuf, | |
4932 | ULONGEST offset, LONGEST len) | |
4933 | { | |
4934 | char buf[128]; | |
4935 | int fd = 0; | |
4936 | int ret = -1; | |
4937 | int pid = PIDGET (inferior_ptid); | |
4938 | ||
4939 | if (!annex) | |
4940 | { | |
4941 | if (!readbuf) | |
4942 | return -1; | |
4943 | else | |
4944 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4945 | } | |
4946 | ||
4947 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
4948 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4949 | if (fd <= 0) | |
4950 | return -1; | |
4951 | ||
4952 | if (offset != 0 | |
4953 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4954 | { | |
4955 | close (fd); | |
4956 | return 0; | |
4957 | } | |
4958 | ||
4959 | if (writebuf) | |
4960 | ret = write (fd, writebuf, (size_t) len); | |
4961 | else if (readbuf) | |
4962 | ret = read (fd, readbuf, (size_t) len); | |
4963 | ||
4964 | close (fd); | |
4965 | return ret; | |
4966 | } | |
4967 | ||
4968 | ||
dba24537 AC |
4969 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
4970 | ||
4971 | static void | |
4972 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4973 | { | |
4974 | int len = strlen (line) - 1; | |
4975 | const char *p; | |
4976 | int signum; | |
4977 | ||
4978 | if (line[len] != '\n') | |
8a3fe4f8 | 4979 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4980 | |
4981 | p = line; | |
4982 | signum = len * 4; | |
4983 | while (len-- > 0) | |
4984 | { | |
4985 | int digit; | |
4986 | ||
4987 | if (*p >= '0' && *p <= '9') | |
4988 | digit = *p - '0'; | |
4989 | else if (*p >= 'a' && *p <= 'f') | |
4990 | digit = *p - 'a' + 10; | |
4991 | else | |
8a3fe4f8 | 4992 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4993 | |
4994 | signum -= 4; | |
4995 | ||
4996 | if (digit & 1) | |
4997 | sigaddset (sigs, signum + 1); | |
4998 | if (digit & 2) | |
4999 | sigaddset (sigs, signum + 2); | |
5000 | if (digit & 4) | |
5001 | sigaddset (sigs, signum + 3); | |
5002 | if (digit & 8) | |
5003 | sigaddset (sigs, signum + 4); | |
5004 | ||
5005 | p++; | |
5006 | } | |
5007 | } | |
5008 | ||
5009 | /* Find process PID's pending signals from /proc/pid/status and set | |
5010 | SIGS to match. */ | |
5011 | ||
5012 | void | |
3e43a32a MS |
5013 | linux_proc_pending_signals (int pid, sigset_t *pending, |
5014 | sigset_t *blocked, sigset_t *ignored) | |
dba24537 AC |
5015 | { |
5016 | FILE *procfile; | |
5017 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
7c8a8b04 | 5018 | struct cleanup *cleanup; |
dba24537 AC |
5019 | |
5020 | sigemptyset (pending); | |
5021 | sigemptyset (blocked); | |
5022 | sigemptyset (ignored); | |
5023 | sprintf (fname, "/proc/%d/status", pid); | |
5024 | procfile = fopen (fname, "r"); | |
5025 | if (procfile == NULL) | |
8a3fe4f8 | 5026 | error (_("Could not open %s"), fname); |
7c8a8b04 | 5027 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
5028 | |
5029 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
5030 | { | |
5031 | /* Normal queued signals are on the SigPnd line in the status | |
5032 | file. However, 2.6 kernels also have a "shared" pending | |
5033 | queue for delivering signals to a thread group, so check for | |
5034 | a ShdPnd line also. | |
5035 | ||
5036 | Unfortunately some Red Hat kernels include the shared pending | |
5037 | queue but not the ShdPnd status field. */ | |
5038 | ||
5039 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
5040 | add_line_to_sigset (buffer + 8, pending); | |
5041 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
5042 | add_line_to_sigset (buffer + 8, pending); | |
5043 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
5044 | add_line_to_sigset (buffer + 8, blocked); | |
5045 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
5046 | add_line_to_sigset (buffer + 8, ignored); | |
5047 | } | |
5048 | ||
7c8a8b04 | 5049 | do_cleanups (cleanup); |
dba24537 AC |
5050 | } |
5051 | ||
07e059b5 VP |
5052 | static LONGEST |
5053 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
e0881a8e MS |
5054 | const char *annex, gdb_byte *readbuf, |
5055 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
07e059b5 VP |
5056 | { |
5057 | /* We make the process list snapshot when the object starts to be | |
5058 | read. */ | |
5059 | static const char *buf; | |
5060 | static LONGEST len_avail = -1; | |
5061 | static struct obstack obstack; | |
5062 | ||
5063 | DIR *dirp; | |
5064 | ||
5065 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
5066 | ||
a61408f8 SS |
5067 | if (!annex) |
5068 | { | |
5069 | if (offset == 0) | |
5070 | { | |
5071 | if (len_avail != -1 && len_avail != 0) | |
5072 | obstack_free (&obstack, NULL); | |
5073 | len_avail = 0; | |
5074 | buf = NULL; | |
5075 | obstack_init (&obstack); | |
5076 | obstack_grow_str (&obstack, "<osdata type=\"types\">\n"); | |
5077 | ||
3e43a32a | 5078 | obstack_xml_printf (&obstack, |
a61408f8 SS |
5079 | "<item>" |
5080 | "<column name=\"Type\">processes</column>" | |
3e43a32a MS |
5081 | "<column name=\"Description\">" |
5082 | "Listing of all processes</column>" | |
a61408f8 SS |
5083 | "</item>"); |
5084 | ||
5085 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
5086 | buf = obstack_finish (&obstack); | |
5087 | len_avail = strlen (buf); | |
5088 | } | |
5089 | ||
5090 | if (offset >= len_avail) | |
5091 | { | |
5092 | /* Done. Get rid of the obstack. */ | |
5093 | obstack_free (&obstack, NULL); | |
5094 | buf = NULL; | |
5095 | len_avail = 0; | |
5096 | return 0; | |
5097 | } | |
5098 | ||
5099 | if (len > len_avail - offset) | |
5100 | len = len_avail - offset; | |
5101 | memcpy (readbuf, buf + offset, len); | |
5102 | ||
5103 | return len; | |
5104 | } | |
5105 | ||
07e059b5 VP |
5106 | if (strcmp (annex, "processes") != 0) |
5107 | return 0; | |
5108 | ||
5109 | gdb_assert (readbuf && !writebuf); | |
5110 | ||
5111 | if (offset == 0) | |
5112 | { | |
5113 | if (len_avail != -1 && len_avail != 0) | |
e0881a8e | 5114 | obstack_free (&obstack, NULL); |
07e059b5 VP |
5115 | len_avail = 0; |
5116 | buf = NULL; | |
5117 | obstack_init (&obstack); | |
5118 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
5119 | ||
5120 | dirp = opendir ("/proc"); | |
5121 | if (dirp) | |
e0881a8e MS |
5122 | { |
5123 | struct dirent *dp; | |
5124 | ||
5125 | while ((dp = readdir (dirp)) != NULL) | |
5126 | { | |
5127 | struct stat statbuf; | |
5128 | char procentry[sizeof ("/proc/4294967295")]; | |
5129 | ||
5130 | if (!isdigit (dp->d_name[0]) | |
5131 | || NAMELEN (dp) > sizeof ("4294967295") - 1) | |
5132 | continue; | |
5133 | ||
5134 | sprintf (procentry, "/proc/%s", dp->d_name); | |
5135 | if (stat (procentry, &statbuf) == 0 | |
5136 | && S_ISDIR (statbuf.st_mode)) | |
5137 | { | |
5138 | char *pathname; | |
5139 | FILE *f; | |
5140 | char cmd[MAXPATHLEN + 1]; | |
5141 | struct passwd *entry; | |
5142 | ||
5143 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
5144 | entry = getpwuid (statbuf.st_uid); | |
5145 | ||
5146 | if ((f = fopen (pathname, "r")) != NULL) | |
5147 | { | |
5eee517d | 5148 | size_t length = fread (cmd, 1, sizeof (cmd) - 1, f); |
e0881a8e | 5149 | |
5eee517d | 5150 | if (length > 0) |
e0881a8e MS |
5151 | { |
5152 | int i; | |
5153 | ||
5eee517d | 5154 | for (i = 0; i < length; i++) |
e0881a8e MS |
5155 | if (cmd[i] == '\0') |
5156 | cmd[i] = ' '; | |
5eee517d | 5157 | cmd[length] = '\0'; |
e0881a8e MS |
5158 | |
5159 | obstack_xml_printf ( | |
5160 | &obstack, | |
5161 | "<item>" | |
5162 | "<column name=\"pid\">%s</column>" | |
5163 | "<column name=\"user\">%s</column>" | |
5164 | "<column name=\"command\">%s</column>" | |
5165 | "</item>", | |
5166 | dp->d_name, | |
5167 | entry ? entry->pw_name : "?", | |
5168 | cmd); | |
5169 | } | |
5170 | fclose (f); | |
5171 | } | |
5172 | ||
5173 | xfree (pathname); | |
5174 | } | |
5175 | } | |
5176 | ||
5177 | closedir (dirp); | |
5178 | } | |
07e059b5 VP |
5179 | |
5180 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
5181 | buf = obstack_finish (&obstack); | |
5182 | len_avail = strlen (buf); | |
5183 | } | |
5184 | ||
5185 | if (offset >= len_avail) | |
5186 | { | |
5187 | /* Done. Get rid of the obstack. */ | |
5188 | obstack_free (&obstack, NULL); | |
5189 | buf = NULL; | |
5190 | len_avail = 0; | |
5191 | return 0; | |
5192 | } | |
5193 | ||
5194 | if (len > len_avail - offset) | |
5195 | len = len_avail - offset; | |
5196 | memcpy (readbuf, buf + offset, len); | |
5197 | ||
5198 | return len; | |
5199 | } | |
5200 | ||
10d6c8cd DJ |
5201 | static LONGEST |
5202 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
5203 | const char *annex, gdb_byte *readbuf, | |
5204 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
5205 | { | |
5206 | LONGEST xfer; | |
5207 | ||
5208 | if (object == TARGET_OBJECT_AUXV) | |
9f2982ff | 5209 | return memory_xfer_auxv (ops, object, annex, readbuf, writebuf, |
10d6c8cd DJ |
5210 | offset, len); |
5211 | ||
07e059b5 VP |
5212 | if (object == TARGET_OBJECT_OSDATA) |
5213 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
5214 | offset, len); | |
5215 | ||
efcbbd14 UW |
5216 | if (object == TARGET_OBJECT_SPU) |
5217 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
5218 | offset, len); | |
5219 | ||
8f313923 JK |
5220 | /* GDB calculates all the addresses in possibly larget width of the address. |
5221 | Address width needs to be masked before its final use - either by | |
5222 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
5223 | ||
5224 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
5225 | ||
5226 | if (object == TARGET_OBJECT_MEMORY) | |
5227 | { | |
5228 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
5229 | ||
5230 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
5231 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
5232 | } | |
5233 | ||
10d6c8cd DJ |
5234 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
5235 | offset, len); | |
5236 | if (xfer != 0) | |
5237 | return xfer; | |
5238 | ||
5239 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
5240 | offset, len); | |
5241 | } | |
5242 | ||
e9efe249 | 5243 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
5244 | it with local methods. */ |
5245 | ||
910122bf UW |
5246 | static void |
5247 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 5248 | { |
6d8fd2b7 UW |
5249 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
5250 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; | |
5251 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; | |
a96d9b2e | 5252 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 5253 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 5254 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
5255 | t->to_post_attach = linux_child_post_attach; |
5256 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
5257 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
5258 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
5259 | ||
5260 | super_xfer_partial = t->to_xfer_partial; | |
5261 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
5262 | } |
5263 | ||
5264 | struct target_ops * | |
5265 | linux_target (void) | |
5266 | { | |
5267 | struct target_ops *t; | |
5268 | ||
5269 | t = inf_ptrace_target (); | |
5270 | linux_target_install_ops (t); | |
5271 | ||
5272 | return t; | |
5273 | } | |
5274 | ||
5275 | struct target_ops * | |
7714d83a | 5276 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
5277 | { |
5278 | struct target_ops *t; | |
5279 | ||
5280 | t = inf_ptrace_trad_target (register_u_offset); | |
5281 | linux_target_install_ops (t); | |
10d6c8cd | 5282 | |
10d6c8cd DJ |
5283 | return t; |
5284 | } | |
5285 | ||
b84876c2 PA |
5286 | /* target_is_async_p implementation. */ |
5287 | ||
5288 | static int | |
5289 | linux_nat_is_async_p (void) | |
5290 | { | |
5291 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5292 | it explicitly with the "set target-async" command. |
b84876c2 | 5293 | Someday, linux will always be async. */ |
c6ebd6cf | 5294 | if (!target_async_permitted) |
b84876c2 PA |
5295 | return 0; |
5296 | ||
d90e17a7 PA |
5297 | /* See target.h/target_async_mask. */ |
5298 | return linux_nat_async_mask_value; | |
b84876c2 PA |
5299 | } |
5300 | ||
5301 | /* target_can_async_p implementation. */ | |
5302 | ||
5303 | static int | |
5304 | linux_nat_can_async_p (void) | |
5305 | { | |
5306 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5307 | it explicitly with the "set target-async" command. |
b84876c2 | 5308 | Someday, linux will always be async. */ |
c6ebd6cf | 5309 | if (!target_async_permitted) |
b84876c2 PA |
5310 | return 0; |
5311 | ||
5312 | /* See target.h/target_async_mask. */ | |
5313 | return linux_nat_async_mask_value; | |
5314 | } | |
5315 | ||
9908b566 VP |
5316 | static int |
5317 | linux_nat_supports_non_stop (void) | |
5318 | { | |
5319 | return 1; | |
5320 | } | |
5321 | ||
d90e17a7 PA |
5322 | /* True if we want to support multi-process. To be removed when GDB |
5323 | supports multi-exec. */ | |
5324 | ||
2277426b | 5325 | int linux_multi_process = 1; |
d90e17a7 PA |
5326 | |
5327 | static int | |
5328 | linux_nat_supports_multi_process (void) | |
5329 | { | |
5330 | return linux_multi_process; | |
5331 | } | |
5332 | ||
b84876c2 PA |
5333 | /* target_async_mask implementation. */ |
5334 | ||
5335 | static int | |
7feb7d06 | 5336 | linux_nat_async_mask (int new_mask) |
b84876c2 | 5337 | { |
7feb7d06 | 5338 | int curr_mask = linux_nat_async_mask_value; |
b84876c2 | 5339 | |
7feb7d06 | 5340 | if (curr_mask != new_mask) |
b84876c2 | 5341 | { |
7feb7d06 | 5342 | if (new_mask == 0) |
b84876c2 PA |
5343 | { |
5344 | linux_nat_async (NULL, 0); | |
7feb7d06 | 5345 | linux_nat_async_mask_value = new_mask; |
b84876c2 PA |
5346 | } |
5347 | else | |
5348 | { | |
7feb7d06 | 5349 | linux_nat_async_mask_value = new_mask; |
84e46146 | 5350 | |
7feb7d06 PA |
5351 | /* If we're going out of async-mask in all-stop, then the |
5352 | inferior is stopped. The next resume will call | |
5353 | target_async. In non-stop, the target event source | |
5354 | should be always registered in the event loop. Do so | |
5355 | now. */ | |
5356 | if (non_stop) | |
5357 | linux_nat_async (inferior_event_handler, 0); | |
b84876c2 PA |
5358 | } |
5359 | } | |
5360 | ||
7feb7d06 | 5361 | return curr_mask; |
b84876c2 PA |
5362 | } |
5363 | ||
5364 | static int async_terminal_is_ours = 1; | |
5365 | ||
5366 | /* target_terminal_inferior implementation. */ | |
5367 | ||
5368 | static void | |
5369 | linux_nat_terminal_inferior (void) | |
5370 | { | |
5371 | if (!target_is_async_p ()) | |
5372 | { | |
5373 | /* Async mode is disabled. */ | |
5374 | terminal_inferior (); | |
5375 | return; | |
5376 | } | |
5377 | ||
b84876c2 PA |
5378 | terminal_inferior (); |
5379 | ||
d9d2d8b6 | 5380 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
5381 | if (!async_terminal_is_ours) |
5382 | return; | |
5383 | ||
5384 | delete_file_handler (input_fd); | |
5385 | async_terminal_is_ours = 0; | |
5386 | set_sigint_trap (); | |
5387 | } | |
5388 | ||
5389 | /* target_terminal_ours implementation. */ | |
5390 | ||
2c0b251b | 5391 | static void |
b84876c2 PA |
5392 | linux_nat_terminal_ours (void) |
5393 | { | |
5394 | if (!target_is_async_p ()) | |
5395 | { | |
5396 | /* Async mode is disabled. */ | |
5397 | terminal_ours (); | |
5398 | return; | |
5399 | } | |
5400 | ||
5401 | /* GDB should never give the terminal to the inferior if the | |
5402 | inferior is running in the background (run&, continue&, etc.), | |
5403 | but claiming it sure should. */ | |
5404 | terminal_ours (); | |
5405 | ||
b84876c2 PA |
5406 | if (async_terminal_is_ours) |
5407 | return; | |
5408 | ||
5409 | clear_sigint_trap (); | |
5410 | add_file_handler (input_fd, stdin_event_handler, 0); | |
5411 | async_terminal_is_ours = 1; | |
5412 | } | |
5413 | ||
5414 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
5415 | void *context); | |
5416 | static void *async_client_context; | |
5417 | ||
7feb7d06 PA |
5418 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5419 | so we notice when any child changes state, and notify the | |
5420 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
5421 | above to wait for the arrival of a SIGCHLD. */ | |
5422 | ||
b84876c2 | 5423 | static void |
7feb7d06 | 5424 | sigchld_handler (int signo) |
b84876c2 | 5425 | { |
7feb7d06 PA |
5426 | int old_errno = errno; |
5427 | ||
5428 | if (debug_linux_nat_async) | |
5429 | fprintf_unfiltered (gdb_stdlog, "sigchld\n"); | |
5430 | ||
5431 | if (signo == SIGCHLD | |
5432 | && linux_nat_event_pipe[0] != -1) | |
5433 | async_file_mark (); /* Let the event loop know that there are | |
5434 | events to handle. */ | |
5435 | ||
5436 | errno = old_errno; | |
5437 | } | |
5438 | ||
5439 | /* Callback registered with the target events file descriptor. */ | |
5440 | ||
5441 | static void | |
5442 | handle_target_event (int error, gdb_client_data client_data) | |
5443 | { | |
5444 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
5445 | } | |
5446 | ||
5447 | /* Create/destroy the target events pipe. Returns previous state. */ | |
5448 | ||
5449 | static int | |
5450 | linux_async_pipe (int enable) | |
5451 | { | |
5452 | int previous = (linux_nat_event_pipe[0] != -1); | |
5453 | ||
5454 | if (previous != enable) | |
5455 | { | |
5456 | sigset_t prev_mask; | |
5457 | ||
5458 | block_child_signals (&prev_mask); | |
5459 | ||
5460 | if (enable) | |
5461 | { | |
5462 | if (pipe (linux_nat_event_pipe) == -1) | |
5463 | internal_error (__FILE__, __LINE__, | |
5464 | "creating event pipe failed."); | |
5465 | ||
5466 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5467 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5468 | } | |
5469 | else | |
5470 | { | |
5471 | close (linux_nat_event_pipe[0]); | |
5472 | close (linux_nat_event_pipe[1]); | |
5473 | linux_nat_event_pipe[0] = -1; | |
5474 | linux_nat_event_pipe[1] = -1; | |
5475 | } | |
5476 | ||
5477 | restore_child_signals_mask (&prev_mask); | |
5478 | } | |
5479 | ||
5480 | return previous; | |
b84876c2 PA |
5481 | } |
5482 | ||
5483 | /* target_async implementation. */ | |
5484 | ||
5485 | static void | |
5486 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
5487 | void *context), void *context) | |
5488 | { | |
c6ebd6cf | 5489 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
5490 | internal_error (__FILE__, __LINE__, |
5491 | "Calling target_async when async is masked"); | |
5492 | ||
5493 | if (callback != NULL) | |
5494 | { | |
5495 | async_client_callback = callback; | |
5496 | async_client_context = context; | |
7feb7d06 PA |
5497 | if (!linux_async_pipe (1)) |
5498 | { | |
5499 | add_file_handler (linux_nat_event_pipe[0], | |
5500 | handle_target_event, NULL); | |
5501 | /* There may be pending events to handle. Tell the event loop | |
5502 | to poll them. */ | |
5503 | async_file_mark (); | |
5504 | } | |
b84876c2 PA |
5505 | } |
5506 | else | |
5507 | { | |
5508 | async_client_callback = callback; | |
5509 | async_client_context = context; | |
b84876c2 | 5510 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 5511 | linux_async_pipe (0); |
b84876c2 PA |
5512 | } |
5513 | return; | |
5514 | } | |
5515 | ||
252fbfc8 PA |
5516 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
5517 | event came out. */ | |
5518 | ||
4c28f408 | 5519 | static int |
252fbfc8 | 5520 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 5521 | { |
d90e17a7 | 5522 | if (!lwp->stopped) |
252fbfc8 | 5523 | { |
d90e17a7 | 5524 | ptid_t ptid = lwp->ptid; |
252fbfc8 | 5525 | |
d90e17a7 PA |
5526 | if (debug_linux_nat) |
5527 | fprintf_unfiltered (gdb_stdlog, | |
5528 | "LNSL: running -> suspending %s\n", | |
5529 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 5530 | |
252fbfc8 | 5531 | |
d90e17a7 PA |
5532 | stop_callback (lwp, NULL); |
5533 | stop_wait_callback (lwp, NULL); | |
252fbfc8 | 5534 | |
d90e17a7 PA |
5535 | /* If the lwp exits while we try to stop it, there's nothing |
5536 | else to do. */ | |
5537 | lwp = find_lwp_pid (ptid); | |
5538 | if (lwp == NULL) | |
5539 | return 0; | |
252fbfc8 | 5540 | |
d90e17a7 PA |
5541 | /* If we didn't collect any signal other than SIGSTOP while |
5542 | stopping the LWP, push a SIGNAL_0 event. In either case, the | |
5543 | event-loop will end up calling target_wait which will collect | |
5544 | these. */ | |
5545 | if (lwp->status == 0) | |
5546 | lwp->status = W_STOPCODE (0); | |
5547 | async_file_mark (); | |
5548 | } | |
5549 | else | |
5550 | { | |
5551 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 5552 | |
d90e17a7 PA |
5553 | if (debug_linux_nat) |
5554 | { | |
e09875d4 | 5555 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
3e43a32a MS |
5556 | fprintf_unfiltered (gdb_stdlog, |
5557 | "LNSL: already stopped/stop_requested %s\n", | |
d90e17a7 PA |
5558 | target_pid_to_str (lwp->ptid)); |
5559 | else | |
3e43a32a MS |
5560 | fprintf_unfiltered (gdb_stdlog, |
5561 | "LNSL: already stopped/no " | |
5562 | "stop_requested yet %s\n", | |
d90e17a7 | 5563 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
5564 | } |
5565 | } | |
4c28f408 PA |
5566 | return 0; |
5567 | } | |
5568 | ||
5569 | static void | |
5570 | linux_nat_stop (ptid_t ptid) | |
5571 | { | |
5572 | if (non_stop) | |
d90e17a7 | 5573 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
5574 | else |
5575 | linux_ops->to_stop (ptid); | |
5576 | } | |
5577 | ||
d90e17a7 PA |
5578 | static void |
5579 | linux_nat_close (int quitting) | |
5580 | { | |
5581 | /* Unregister from the event loop. */ | |
5582 | if (target_is_async_p ()) | |
5583 | target_async (NULL, 0); | |
5584 | ||
5585 | /* Reset the async_masking. */ | |
5586 | linux_nat_async_mask_value = 1; | |
5587 | ||
5588 | if (linux_ops->to_close) | |
5589 | linux_ops->to_close (quitting); | |
5590 | } | |
5591 | ||
c0694254 PA |
5592 | /* When requests are passed down from the linux-nat layer to the |
5593 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
5594 | used. The address space pointer is stored in the inferior object, | |
5595 | but the common code that is passed such ptid can't tell whether | |
5596 | lwpid is a "main" process id or not (it assumes so). We reverse | |
5597 | look up the "main" process id from the lwp here. */ | |
5598 | ||
5599 | struct address_space * | |
5600 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) | |
5601 | { | |
5602 | struct lwp_info *lwp; | |
5603 | struct inferior *inf; | |
5604 | int pid; | |
5605 | ||
5606 | pid = GET_LWP (ptid); | |
5607 | if (GET_LWP (ptid) == 0) | |
5608 | { | |
5609 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
5610 | tgid. */ | |
5611 | lwp = find_lwp_pid (ptid); | |
5612 | pid = GET_PID (lwp->ptid); | |
5613 | } | |
5614 | else | |
5615 | { | |
5616 | /* A (pid,lwpid,0) ptid. */ | |
5617 | pid = GET_PID (ptid); | |
5618 | } | |
5619 | ||
5620 | inf = find_inferior_pid (pid); | |
5621 | gdb_assert (inf != NULL); | |
5622 | return inf->aspace; | |
5623 | } | |
5624 | ||
dc146f7c VP |
5625 | int |
5626 | linux_nat_core_of_thread_1 (ptid_t ptid) | |
5627 | { | |
5628 | struct cleanup *back_to; | |
5629 | char *filename; | |
5630 | FILE *f; | |
5631 | char *content = NULL; | |
5632 | char *p; | |
5633 | char *ts = 0; | |
5634 | int content_read = 0; | |
5635 | int i; | |
5636 | int core; | |
5637 | ||
5638 | filename = xstrprintf ("/proc/%d/task/%ld/stat", | |
5639 | GET_PID (ptid), GET_LWP (ptid)); | |
5640 | back_to = make_cleanup (xfree, filename); | |
5641 | ||
5642 | f = fopen (filename, "r"); | |
5643 | if (!f) | |
5644 | { | |
5645 | do_cleanups (back_to); | |
5646 | return -1; | |
5647 | } | |
5648 | ||
5649 | make_cleanup_fclose (f); | |
5650 | ||
5651 | for (;;) | |
5652 | { | |
5653 | int n; | |
e0881a8e | 5654 | |
dc146f7c VP |
5655 | content = xrealloc (content, content_read + 1024); |
5656 | n = fread (content + content_read, 1, 1024, f); | |
5657 | content_read += n; | |
5658 | if (n < 1024) | |
5659 | { | |
5660 | content[content_read] = '\0'; | |
5661 | break; | |
5662 | } | |
5663 | } | |
5664 | ||
5665 | make_cleanup (xfree, content); | |
5666 | ||
5667 | p = strchr (content, '('); | |
ca2a87a0 JK |
5668 | |
5669 | /* Skip ")". */ | |
5670 | if (p != NULL) | |
5671 | p = strchr (p, ')'); | |
5672 | if (p != NULL) | |
5673 | p++; | |
dc146f7c VP |
5674 | |
5675 | /* If the first field after program name has index 0, then core number is | |
5676 | the field with index 36. There's no constant for that anywhere. */ | |
ca2a87a0 JK |
5677 | if (p != NULL) |
5678 | p = strtok_r (p, " ", &ts); | |
5679 | for (i = 0; p != NULL && i != 36; ++i) | |
dc146f7c VP |
5680 | p = strtok_r (NULL, " ", &ts); |
5681 | ||
ca2a87a0 | 5682 | if (p == NULL || sscanf (p, "%d", &core) == 0) |
dc146f7c VP |
5683 | core = -1; |
5684 | ||
5685 | do_cleanups (back_to); | |
5686 | ||
5687 | return core; | |
5688 | } | |
5689 | ||
5690 | /* Return the cached value of the processor core for thread PTID. */ | |
5691 | ||
5692 | int | |
5693 | linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid) | |
5694 | { | |
5695 | struct lwp_info *info = find_lwp_pid (ptid); | |
e0881a8e | 5696 | |
dc146f7c VP |
5697 | if (info) |
5698 | return info->core; | |
5699 | return -1; | |
5700 | } | |
5701 | ||
f973ed9c DJ |
5702 | void |
5703 | linux_nat_add_target (struct target_ops *t) | |
5704 | { | |
f973ed9c DJ |
5705 | /* Save the provided single-threaded target. We save this in a separate |
5706 | variable because another target we've inherited from (e.g. inf-ptrace) | |
5707 | may have saved a pointer to T; we want to use it for the final | |
5708 | process stratum target. */ | |
5709 | linux_ops_saved = *t; | |
5710 | linux_ops = &linux_ops_saved; | |
5711 | ||
5712 | /* Override some methods for multithreading. */ | |
b84876c2 | 5713 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
5714 | t->to_attach = linux_nat_attach; |
5715 | t->to_detach = linux_nat_detach; | |
5716 | t->to_resume = linux_nat_resume; | |
5717 | t->to_wait = linux_nat_wait; | |
5718 | t->to_xfer_partial = linux_nat_xfer_partial; | |
5719 | t->to_kill = linux_nat_kill; | |
5720 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
5721 | t->to_thread_alive = linux_nat_thread_alive; | |
5722 | t->to_pid_to_str = linux_nat_pid_to_str; | |
4694da01 | 5723 | t->to_thread_name = linux_nat_thread_name; |
f973ed9c | 5724 | t->to_has_thread_control = tc_schedlock; |
c0694254 | 5725 | t->to_thread_address_space = linux_nat_thread_address_space; |
ebec9a0f PA |
5726 | t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint; |
5727 | t->to_stopped_data_address = linux_nat_stopped_data_address; | |
f973ed9c | 5728 | |
b84876c2 PA |
5729 | t->to_can_async_p = linux_nat_can_async_p; |
5730 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5731 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
5732 | t->to_async = linux_nat_async; |
5733 | t->to_async_mask = linux_nat_async_mask; | |
5734 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
5735 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5736 | t->to_close = linux_nat_close; |
b84876c2 | 5737 | |
4c28f408 PA |
5738 | /* Methods for non-stop support. */ |
5739 | t->to_stop = linux_nat_stop; | |
5740 | ||
d90e17a7 PA |
5741 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5742 | ||
dc146f7c VP |
5743 | t->to_core_of_thread = linux_nat_core_of_thread; |
5744 | ||
f973ed9c DJ |
5745 | /* We don't change the stratum; this target will sit at |
5746 | process_stratum and thread_db will set at thread_stratum. This | |
5747 | is a little strange, since this is a multi-threaded-capable | |
5748 | target, but we want to be on the stack below thread_db, and we | |
5749 | also want to be used for single-threaded processes. */ | |
5750 | ||
5751 | add_target (t); | |
f973ed9c DJ |
5752 | } |
5753 | ||
9f0bdab8 DJ |
5754 | /* Register a method to call whenever a new thread is attached. */ |
5755 | void | |
5756 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5757 | { | |
5758 | /* Save the pointer. We only support a single registered instance | |
5759 | of the GNU/Linux native target, so we do not need to map this to | |
5760 | T. */ | |
5761 | linux_nat_new_thread = new_thread; | |
5762 | } | |
5763 | ||
5b009018 PA |
5764 | /* Register a method that converts a siginfo object between the layout |
5765 | that ptrace returns, and the layout in the architecture of the | |
5766 | inferior. */ | |
5767 | void | |
5768 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5769 | int (*siginfo_fixup) (struct siginfo *, | |
5770 | gdb_byte *, | |
5771 | int)) | |
5772 | { | |
5773 | /* Save the pointer. */ | |
5774 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5775 | } | |
5776 | ||
9f0bdab8 DJ |
5777 | /* Return the saved siginfo associated with PTID. */ |
5778 | struct siginfo * | |
5779 | linux_nat_get_siginfo (ptid_t ptid) | |
5780 | { | |
5781 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5782 | ||
5783 | gdb_assert (lp != NULL); | |
5784 | ||
5785 | return &lp->siginfo; | |
5786 | } | |
5787 | ||
2c0b251b PA |
5788 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5789 | extern initialize_file_ftype _initialize_linux_nat; | |
5790 | ||
d6b0e80f AC |
5791 | void |
5792 | _initialize_linux_nat (void) | |
5793 | { | |
1bedd215 AC |
5794 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
5795 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
5796 | Specify any process id, or use the program being debugged by default.\n\ |
5797 | Specify any of the following keywords for detailed info:\n\ | |
5798 | mappings -- list of mapped memory regions.\n\ | |
5799 | stat -- list a bunch of random process info.\n\ | |
5800 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 5801 | all -- list all available /proc info.")); |
d6b0e80f | 5802 | |
b84876c2 PA |
5803 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5804 | &debug_linux_nat, _("\ | |
5805 | Set debugging of GNU/Linux lwp module."), _("\ | |
5806 | Show debugging of GNU/Linux lwp module."), _("\ | |
5807 | Enables printf debugging output."), | |
5808 | NULL, | |
5809 | show_debug_linux_nat, | |
5810 | &setdebuglist, &showdebuglist); | |
5811 | ||
5812 | add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance, | |
5813 | &debug_linux_nat_async, _("\ | |
5814 | Set debugging of GNU/Linux async lwp module."), _("\ | |
5815 | Show debugging of GNU/Linux async lwp module."), _("\ | |
5816 | Enables printf debugging output."), | |
5817 | NULL, | |
5818 | show_debug_linux_nat_async, | |
5819 | &setdebuglist, &showdebuglist); | |
5820 | ||
b84876c2 | 5821 | /* Save this mask as the default. */ |
d6b0e80f AC |
5822 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5823 | ||
7feb7d06 PA |
5824 | /* Install a SIGCHLD handler. */ |
5825 | sigchld_action.sa_handler = sigchld_handler; | |
5826 | sigemptyset (&sigchld_action.sa_mask); | |
5827 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5828 | |
5829 | /* Make it the default. */ | |
7feb7d06 | 5830 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5831 | |
5832 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5833 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5834 | sigdelset (&suspend_mask, SIGCHLD); | |
5835 | ||
7feb7d06 | 5836 | sigemptyset (&blocked_mask); |
10568435 JK |
5837 | |
5838 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
5839 | &disable_randomization, _("\ | |
5840 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
5841 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
5842 | When this mode is on (which is the default), randomization of the virtual\n\ | |
5843 | address space is disabled. Standalone programs run with the randomization\n\ | |
5844 | enabled by default on some platforms."), | |
5845 | &set_disable_randomization, | |
5846 | &show_disable_randomization, | |
5847 | &setlist, &showlist); | |
d6b0e80f AC |
5848 | } |
5849 | \f | |
5850 | ||
5851 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5852 | the GNU/Linux Threads library and therefore doesn't really belong | |
5853 | here. */ | |
5854 | ||
5855 | /* Read variable NAME in the target and return its value if found. | |
5856 | Otherwise return zero. It is assumed that the type of the variable | |
5857 | is `int'. */ | |
5858 | ||
5859 | static int | |
5860 | get_signo (const char *name) | |
5861 | { | |
5862 | struct minimal_symbol *ms; | |
5863 | int signo; | |
5864 | ||
5865 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5866 | if (ms == NULL) | |
5867 | return 0; | |
5868 | ||
8e70166d | 5869 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5870 | sizeof (signo)) != 0) |
5871 | return 0; | |
5872 | ||
5873 | return signo; | |
5874 | } | |
5875 | ||
5876 | /* Return the set of signals used by the threads library in *SET. */ | |
5877 | ||
5878 | void | |
5879 | lin_thread_get_thread_signals (sigset_t *set) | |
5880 | { | |
5881 | struct sigaction action; | |
5882 | int restart, cancel; | |
5883 | ||
b84876c2 | 5884 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5885 | sigemptyset (set); |
5886 | ||
5887 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5888 | cancel = get_signo ("__pthread_sig_cancel"); |
5889 | ||
5890 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5891 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5892 | not provide any way for the debugger to query the signal numbers - | |
5893 | fortunately they don't change! */ | |
5894 | ||
d6b0e80f | 5895 | if (restart == 0) |
17fbb0bd | 5896 | restart = __SIGRTMIN; |
d6b0e80f | 5897 | |
d6b0e80f | 5898 | if (cancel == 0) |
17fbb0bd | 5899 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5900 | |
5901 | sigaddset (set, restart); | |
5902 | sigaddset (set, cancel); | |
5903 | ||
5904 | /* The GNU/Linux Threads library makes terminating threads send a | |
5905 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
5906 | those (to prevent them from terminating GDB itself, which is | |
5907 | likely to be their default action) and treat them the same way as | |
5908 | SIGCHLD. */ | |
5909 | ||
5910 | action.sa_handler = sigchld_handler; | |
5911 | sigemptyset (&action.sa_mask); | |
58aecb61 | 5912 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
5913 | sigaction (cancel, &action, NULL); |
5914 | ||
5915 | /* We block the "cancel" signal throughout this code ... */ | |
5916 | sigaddset (&blocked_mask, cancel); | |
5917 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
5918 | ||
5919 | /* ... except during a sigsuspend. */ | |
5920 | sigdelset (&suspend_mask, cancel); | |
5921 | } |