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Commit | Line | Data |
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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" |
af96c192 | 33 | #include "linux-ptrace.h" |
ac264b3b | 34 | #include "linux-fork.h" |
d6b0e80f AC |
35 | #include "gdbthread.h" |
36 | #include "gdbcmd.h" | |
37 | #include "regcache.h" | |
4f844a66 | 38 | #include "regset.h" |
10d6c8cd DJ |
39 | #include "inf-ptrace.h" |
40 | #include "auxv.h" | |
dba24537 | 41 | #include <sys/param.h> /* for MAXPATHLEN */ |
1777feb0 | 42 | #include <sys/procfs.h> /* for elf_gregset etc. */ |
dba24537 AC |
43 | #include "elf-bfd.h" /* for elfcore_write_* */ |
44 | #include "gregset.h" /* for gregset */ | |
45 | #include "gdbcore.h" /* for get_exec_file */ | |
46 | #include <ctype.h> /* for isdigit */ | |
1777feb0 | 47 | #include "gdbthread.h" /* for struct thread_info etc. */ |
dba24537 AC |
48 | #include "gdb_stat.h" /* for struct stat */ |
49 | #include <fcntl.h> /* for O_RDONLY */ | |
b84876c2 PA |
50 | #include "inf-loop.h" |
51 | #include "event-loop.h" | |
52 | #include "event-top.h" | |
07e059b5 VP |
53 | #include <pwd.h> |
54 | #include <sys/types.h> | |
55 | #include "gdb_dirent.h" | |
56 | #include "xml-support.h" | |
191c4426 | 57 | #include "terminal.h" |
efcbbd14 | 58 | #include <sys/vfs.h> |
6c95b8df | 59 | #include "solib.h" |
efcbbd14 UW |
60 | |
61 | #ifndef SPUFS_MAGIC | |
62 | #define SPUFS_MAGIC 0x23c9b64e | |
63 | #endif | |
dba24537 | 64 | |
10568435 JK |
65 | #ifdef HAVE_PERSONALITY |
66 | # include <sys/personality.h> | |
67 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
68 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
69 | # endif | |
70 | #endif /* HAVE_PERSONALITY */ | |
71 | ||
1777feb0 | 72 | /* This comment documents high-level logic of this file. |
8a77dff3 VP |
73 | |
74 | Waiting for events in sync mode | |
75 | =============================== | |
76 | ||
77 | When waiting for an event in a specific thread, we just use waitpid, passing | |
78 | the specific pid, and not passing WNOHANG. | |
79 | ||
1777feb0 | 80 | When waiting for an event in all threads, waitpid is not quite good. Prior to |
8a77dff3 | 81 | version 2.4, Linux can either wait for event in main thread, or in secondary |
1777feb0 | 82 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might |
8a77dff3 VP |
83 | miss an event. The solution is to use non-blocking waitpid, together with |
84 | sigsuspend. First, we use non-blocking waitpid to get an event in the main | |
1777feb0 | 85 | process, if any. Second, we use non-blocking waitpid with the __WCLONED |
8a77dff3 VP |
86 | flag to check for events in cloned processes. If nothing is found, we use |
87 | sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something | |
88 | happened to a child process -- and SIGCHLD will be delivered both for events | |
89 | in main debugged process and in cloned processes. As soon as we know there's | |
3e43a32a MS |
90 | an event, we get back to calling nonblocking waitpid with and without |
91 | __WCLONED. | |
8a77dff3 VP |
92 | |
93 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
1777feb0 | 94 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's |
8a77dff3 VP |
95 | blocked, the signal becomes pending and sigsuspend immediately |
96 | notices it and returns. | |
97 | ||
98 | Waiting for events in async mode | |
99 | ================================ | |
100 | ||
7feb7d06 PA |
101 | In async mode, GDB should always be ready to handle both user input |
102 | and target events, so neither blocking waitpid nor sigsuspend are | |
103 | viable options. Instead, we should asynchronously notify the GDB main | |
104 | event loop whenever there's an unprocessed event from the target. We | |
105 | detect asynchronous target events by handling SIGCHLD signals. To | |
106 | notify the event loop about target events, the self-pipe trick is used | |
107 | --- a pipe is registered as waitable event source in the event loop, | |
108 | the event loop select/poll's on the read end of this pipe (as well on | |
109 | other event sources, e.g., stdin), and the SIGCHLD handler writes a | |
110 | byte to this pipe. This is more portable than relying on | |
111 | pselect/ppoll, since on kernels that lack those syscalls, libc | |
112 | emulates them with select/poll+sigprocmask, and that is racy | |
113 | (a.k.a. plain broken). | |
114 | ||
115 | Obviously, if we fail to notify the event loop if there's a target | |
116 | event, it's bad. OTOH, if we notify the event loop when there's no | |
117 | event from the target, linux_nat_wait will detect that there's no real | |
118 | event to report, and return event of type TARGET_WAITKIND_IGNORE. | |
119 | This is mostly harmless, but it will waste time and is better avoided. | |
120 | ||
121 | The main design point is that every time GDB is outside linux-nat.c, | |
122 | we have a SIGCHLD handler installed that is called when something | |
123 | happens to the target and notifies the GDB event loop. Whenever GDB | |
124 | core decides to handle the event, and calls into linux-nat.c, we | |
125 | process things as in sync mode, except that the we never block in | |
126 | sigsuspend. | |
127 | ||
128 | While processing an event, we may end up momentarily blocked in | |
129 | waitpid calls. Those waitpid calls, while blocking, are guarantied to | |
130 | return quickly. E.g., in all-stop mode, before reporting to the core | |
131 | that an LWP hit a breakpoint, all LWPs are stopped by sending them | |
132 | SIGSTOP, and synchronously waiting for the SIGSTOP to be reported. | |
133 | Note that this is different from blocking indefinitely waiting for the | |
134 | next event --- here, we're already handling an event. | |
8a77dff3 VP |
135 | |
136 | Use of signals | |
137 | ============== | |
138 | ||
139 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
140 | signal is not entirely significant; we just need for a signal to be delivered, | |
141 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
142 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
143 | be queued once; we do not keep track of other sources of SIGSTOP. | |
144 | ||
145 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
146 | use them, because they have special behavior when the signal is generated - | |
147 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
148 | kills the entire thread group. | |
149 | ||
150 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
151 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
152 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
153 | ||
154 | We could use a real-time signal instead. This would solve those problems; we | |
155 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
156 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
157 | generates it, and there are races with trying to find a signal that is not | |
158 | blocked. */ | |
a0ef4274 | 159 | |
dba24537 AC |
160 | #ifndef O_LARGEFILE |
161 | #define O_LARGEFILE 0 | |
162 | #endif | |
0274a8ce | 163 | |
ca2163eb PA |
164 | /* Unlike other extended result codes, WSTOPSIG (status) on |
165 | PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but | |
166 | instead SIGTRAP with bit 7 set. */ | |
167 | #define SYSCALL_SIGTRAP (SIGTRAP | 0x80) | |
168 | ||
10d6c8cd DJ |
169 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
170 | the use of the multi-threaded target. */ | |
171 | static struct target_ops *linux_ops; | |
f973ed9c | 172 | static struct target_ops linux_ops_saved; |
10d6c8cd | 173 | |
9f0bdab8 DJ |
174 | /* The method to call, if any, when a new thread is attached. */ |
175 | static void (*linux_nat_new_thread) (ptid_t); | |
176 | ||
5b009018 PA |
177 | /* The method to call, if any, when the siginfo object needs to be |
178 | converted between the layout returned by ptrace, and the layout in | |
179 | the architecture of the inferior. */ | |
180 | static int (*linux_nat_siginfo_fixup) (struct siginfo *, | |
181 | gdb_byte *, | |
182 | int); | |
183 | ||
ac264b3b MS |
184 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
185 | Called by our to_xfer_partial. */ | |
186 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
187 | enum target_object, | |
188 | const char *, gdb_byte *, | |
189 | const gdb_byte *, | |
10d6c8cd DJ |
190 | ULONGEST, LONGEST); |
191 | ||
d6b0e80f | 192 | static int debug_linux_nat; |
920d2a44 AC |
193 | static void |
194 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
195 | struct cmd_list_element *c, const char *value) | |
196 | { | |
197 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
198 | value); | |
199 | } | |
d6b0e80f | 200 | |
b84876c2 PA |
201 | static int debug_linux_nat_async = 0; |
202 | static void | |
203 | show_debug_linux_nat_async (struct ui_file *file, int from_tty, | |
204 | struct cmd_list_element *c, const char *value) | |
205 | { | |
3e43a32a MS |
206 | fprintf_filtered (file, |
207 | _("Debugging of GNU/Linux async lwp module is %s.\n"), | |
b84876c2 PA |
208 | value); |
209 | } | |
210 | ||
10568435 JK |
211 | static int disable_randomization = 1; |
212 | ||
213 | static void | |
214 | show_disable_randomization (struct ui_file *file, int from_tty, | |
215 | struct cmd_list_element *c, const char *value) | |
216 | { | |
217 | #ifdef HAVE_PERSONALITY | |
3e43a32a MS |
218 | fprintf_filtered (file, |
219 | _("Disabling randomization of debuggee's " | |
220 | "virtual address space is %s.\n"), | |
10568435 JK |
221 | value); |
222 | #else /* !HAVE_PERSONALITY */ | |
3e43a32a MS |
223 | fputs_filtered (_("Disabling randomization of debuggee's " |
224 | "virtual address space is unsupported on\n" | |
225 | "this platform.\n"), file); | |
10568435 JK |
226 | #endif /* !HAVE_PERSONALITY */ |
227 | } | |
228 | ||
229 | static void | |
3e43a32a MS |
230 | set_disable_randomization (char *args, int from_tty, |
231 | struct cmd_list_element *c) | |
10568435 JK |
232 | { |
233 | #ifndef HAVE_PERSONALITY | |
3e43a32a MS |
234 | error (_("Disabling randomization of debuggee's " |
235 | "virtual address space is unsupported on\n" | |
236 | "this platform.")); | |
10568435 JK |
237 | #endif /* !HAVE_PERSONALITY */ |
238 | } | |
239 | ||
ae087d01 DJ |
240 | struct simple_pid_list |
241 | { | |
242 | int pid; | |
3d799a95 | 243 | int status; |
ae087d01 DJ |
244 | struct simple_pid_list *next; |
245 | }; | |
246 | struct simple_pid_list *stopped_pids; | |
247 | ||
3993f6b1 DJ |
248 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
249 | can not be used, 1 if it can. */ | |
250 | ||
251 | static int linux_supports_tracefork_flag = -1; | |
252 | ||
3e43a32a MS |
253 | /* This variable is a tri-state flag: -1 for unknown, 0 if |
254 | PTRACE_O_TRACESYSGOOD can not be used, 1 if it can. */ | |
a96d9b2e SDJ |
255 | |
256 | static int linux_supports_tracesysgood_flag = -1; | |
257 | ||
9016a515 DJ |
258 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
259 | PTRACE_O_TRACEVFORKDONE. */ | |
260 | ||
261 | static int linux_supports_tracevforkdone_flag = -1; | |
262 | ||
1777feb0 | 263 | /* Async mode support. */ |
b84876c2 | 264 | |
b84876c2 PA |
265 | /* Zero if the async mode, although enabled, is masked, which means |
266 | linux_nat_wait should behave as if async mode was off. */ | |
267 | static int linux_nat_async_mask_value = 1; | |
268 | ||
a96d9b2e SDJ |
269 | /* Stores the current used ptrace() options. */ |
270 | static int current_ptrace_options = 0; | |
271 | ||
b84876c2 PA |
272 | /* The read/write ends of the pipe registered as waitable file in the |
273 | event loop. */ | |
274 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
275 | ||
7feb7d06 | 276 | /* Flush the event pipe. */ |
b84876c2 | 277 | |
7feb7d06 PA |
278 | static void |
279 | async_file_flush (void) | |
b84876c2 | 280 | { |
7feb7d06 PA |
281 | int ret; |
282 | char buf; | |
b84876c2 | 283 | |
7feb7d06 | 284 | do |
b84876c2 | 285 | { |
7feb7d06 | 286 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 287 | } |
7feb7d06 | 288 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
289 | } |
290 | ||
7feb7d06 PA |
291 | /* Put something (anything, doesn't matter what, or how much) in event |
292 | pipe, so that the select/poll in the event-loop realizes we have | |
293 | something to process. */ | |
252fbfc8 | 294 | |
b84876c2 | 295 | static void |
7feb7d06 | 296 | async_file_mark (void) |
b84876c2 | 297 | { |
7feb7d06 | 298 | int ret; |
b84876c2 | 299 | |
7feb7d06 PA |
300 | /* It doesn't really matter what the pipe contains, as long we end |
301 | up with something in it. Might as well flush the previous | |
302 | left-overs. */ | |
303 | async_file_flush (); | |
b84876c2 | 304 | |
7feb7d06 | 305 | do |
b84876c2 | 306 | { |
7feb7d06 | 307 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 308 | } |
7feb7d06 | 309 | while (ret == -1 && errno == EINTR); |
b84876c2 | 310 | |
7feb7d06 PA |
311 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
312 | be awakened anyway. */ | |
b84876c2 PA |
313 | } |
314 | ||
7feb7d06 | 315 | static void linux_nat_async (void (*callback) |
3e43a32a MS |
316 | (enum inferior_event_type event_type, |
317 | void *context), | |
7feb7d06 PA |
318 | void *context); |
319 | static int linux_nat_async_mask (int mask); | |
320 | static int kill_lwp (int lwpid, int signo); | |
321 | ||
322 | static int stop_callback (struct lwp_info *lp, void *data); | |
323 | ||
324 | static void block_child_signals (sigset_t *prev_mask); | |
325 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
2277426b PA |
326 | |
327 | struct lwp_info; | |
328 | static struct lwp_info *add_lwp (ptid_t ptid); | |
329 | static void purge_lwp_list (int pid); | |
330 | static struct lwp_info *find_lwp_pid (ptid_t ptid); | |
331 | ||
ae087d01 DJ |
332 | \f |
333 | /* Trivial list manipulation functions to keep track of a list of | |
334 | new stopped processes. */ | |
335 | static void | |
3d799a95 | 336 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
337 | { |
338 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
e0881a8e | 339 | |
ae087d01 | 340 | new_pid->pid = pid; |
3d799a95 | 341 | new_pid->status = status; |
ae087d01 DJ |
342 | new_pid->next = *listp; |
343 | *listp = new_pid; | |
344 | } | |
345 | ||
346 | static int | |
46a96992 | 347 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) |
ae087d01 DJ |
348 | { |
349 | struct simple_pid_list **p; | |
350 | ||
351 | for (p = listp; *p != NULL; p = &(*p)->next) | |
352 | if ((*p)->pid == pid) | |
353 | { | |
354 | struct simple_pid_list *next = (*p)->next; | |
e0881a8e | 355 | |
46a96992 | 356 | *statusp = (*p)->status; |
ae087d01 DJ |
357 | xfree (*p); |
358 | *p = next; | |
359 | return 1; | |
360 | } | |
361 | return 0; | |
362 | } | |
363 | ||
3d799a95 DJ |
364 | static void |
365 | linux_record_stopped_pid (int pid, int status) | |
ae087d01 | 366 | { |
3d799a95 | 367 | add_to_pid_list (&stopped_pids, pid, status); |
ae087d01 DJ |
368 | } |
369 | ||
3993f6b1 DJ |
370 | \f |
371 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
372 | ||
373 | static void | |
374 | linux_tracefork_child (void) | |
375 | { | |
3993f6b1 DJ |
376 | ptrace (PTRACE_TRACEME, 0, 0, 0); |
377 | kill (getpid (), SIGSTOP); | |
378 | fork (); | |
48bb3cce | 379 | _exit (0); |
3993f6b1 DJ |
380 | } |
381 | ||
7feb7d06 | 382 | /* Wrapper function for waitpid which handles EINTR. */ |
b957e937 DJ |
383 | |
384 | static int | |
46a96992 | 385 | my_waitpid (int pid, int *statusp, int flags) |
b957e937 DJ |
386 | { |
387 | int ret; | |
b84876c2 | 388 | |
b957e937 DJ |
389 | do |
390 | { | |
46a96992 | 391 | ret = waitpid (pid, statusp, flags); |
b957e937 DJ |
392 | } |
393 | while (ret == -1 && errno == EINTR); | |
394 | ||
395 | return ret; | |
396 | } | |
397 | ||
398 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
399 | ||
400 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
401 | we know that the feature is not available. This may change the tracing | |
402 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
403 | ||
404 | However, if it succeeds, we don't know for sure that the feature is | |
405 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 406 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
407 | fork tracing, and let it fork. If the process exits, we assume that we |
408 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
409 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
410 | |
411 | static void | |
b957e937 | 412 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
413 | { |
414 | int child_pid, ret, status; | |
415 | long second_pid; | |
7feb7d06 | 416 | sigset_t prev_mask; |
4c28f408 | 417 | |
7feb7d06 PA |
418 | /* We don't want those ptrace calls to be interrupted. */ |
419 | block_child_signals (&prev_mask); | |
3993f6b1 | 420 | |
b957e937 DJ |
421 | linux_supports_tracefork_flag = 0; |
422 | linux_supports_tracevforkdone_flag = 0; | |
423 | ||
424 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
425 | if (ret != 0) | |
7feb7d06 PA |
426 | { |
427 | restore_child_signals_mask (&prev_mask); | |
428 | return; | |
429 | } | |
b957e937 | 430 | |
3993f6b1 DJ |
431 | child_pid = fork (); |
432 | if (child_pid == -1) | |
e2e0b3e5 | 433 | perror_with_name (("fork")); |
3993f6b1 DJ |
434 | |
435 | if (child_pid == 0) | |
436 | linux_tracefork_child (); | |
437 | ||
b957e937 | 438 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 439 | if (ret == -1) |
e2e0b3e5 | 440 | perror_with_name (("waitpid")); |
3993f6b1 | 441 | else if (ret != child_pid) |
8a3fe4f8 | 442 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 443 | if (! WIFSTOPPED (status)) |
3e43a32a MS |
444 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), |
445 | status); | |
3993f6b1 | 446 | |
3993f6b1 DJ |
447 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
448 | if (ret != 0) | |
449 | { | |
b957e937 DJ |
450 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
451 | if (ret != 0) | |
452 | { | |
8a3fe4f8 | 453 | warning (_("linux_test_for_tracefork: failed to kill child")); |
7feb7d06 | 454 | restore_child_signals_mask (&prev_mask); |
b957e937 DJ |
455 | return; |
456 | } | |
457 | ||
458 | ret = my_waitpid (child_pid, &status, 0); | |
459 | if (ret != child_pid) | |
3e43a32a MS |
460 | warning (_("linux_test_for_tracefork: failed " |
461 | "to wait for killed child")); | |
b957e937 | 462 | else if (!WIFSIGNALED (status)) |
3e43a32a MS |
463 | warning (_("linux_test_for_tracefork: unexpected " |
464 | "wait status 0x%x from killed child"), status); | |
b957e937 | 465 | |
7feb7d06 | 466 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
467 | return; |
468 | } | |
469 | ||
9016a515 DJ |
470 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
471 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
472 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
473 | linux_supports_tracevforkdone_flag = (ret == 0); | |
474 | ||
b957e937 DJ |
475 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
476 | if (ret != 0) | |
8a3fe4f8 | 477 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
478 | |
479 | ret = my_waitpid (child_pid, &status, 0); | |
480 | ||
3993f6b1 DJ |
481 | if (ret == child_pid && WIFSTOPPED (status) |
482 | && status >> 16 == PTRACE_EVENT_FORK) | |
483 | { | |
484 | second_pid = 0; | |
485 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
486 | if (ret == 0 && second_pid != 0) | |
487 | { | |
488 | int second_status; | |
489 | ||
490 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
491 | my_waitpid (second_pid, &second_status, 0); |
492 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
493 | if (ret != 0) | |
3e43a32a MS |
494 | warning (_("linux_test_for_tracefork: " |
495 | "failed to kill second child")); | |
97725dc4 | 496 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
497 | } |
498 | } | |
b957e937 | 499 | else |
8a3fe4f8 AC |
500 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
501 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 502 | |
b957e937 DJ |
503 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
504 | if (ret != 0) | |
8a3fe4f8 | 505 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 506 | my_waitpid (child_pid, &status, 0); |
4c28f408 | 507 | |
7feb7d06 | 508 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
509 | } |
510 | ||
a96d9b2e SDJ |
511 | /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls. |
512 | ||
513 | We try to enable syscall tracing on ORIGINAL_PID. If this fails, | |
514 | we know that the feature is not available. This may change the tracing | |
515 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. */ | |
516 | ||
517 | static void | |
518 | linux_test_for_tracesysgood (int original_pid) | |
519 | { | |
520 | int ret; | |
521 | sigset_t prev_mask; | |
522 | ||
523 | /* We don't want those ptrace calls to be interrupted. */ | |
524 | block_child_signals (&prev_mask); | |
525 | ||
526 | linux_supports_tracesysgood_flag = 0; | |
527 | ||
528 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACESYSGOOD); | |
529 | if (ret != 0) | |
530 | goto out; | |
531 | ||
532 | linux_supports_tracesysgood_flag = 1; | |
533 | out: | |
534 | restore_child_signals_mask (&prev_mask); | |
535 | } | |
536 | ||
537 | /* Determine wether we support PTRACE_O_TRACESYSGOOD option available. | |
538 | This function also sets linux_supports_tracesysgood_flag. */ | |
539 | ||
540 | static int | |
541 | linux_supports_tracesysgood (int pid) | |
542 | { | |
543 | if (linux_supports_tracesysgood_flag == -1) | |
544 | linux_test_for_tracesysgood (pid); | |
545 | return linux_supports_tracesysgood_flag; | |
546 | } | |
547 | ||
3993f6b1 DJ |
548 | /* Return non-zero iff we have tracefork functionality available. |
549 | This function also sets linux_supports_tracefork_flag. */ | |
550 | ||
551 | static int | |
b957e937 | 552 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
553 | { |
554 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 555 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
556 | return linux_supports_tracefork_flag; |
557 | } | |
558 | ||
9016a515 | 559 | static int |
b957e937 | 560 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
561 | { |
562 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 563 | linux_test_for_tracefork (pid); |
9016a515 DJ |
564 | return linux_supports_tracevforkdone_flag; |
565 | } | |
566 | ||
a96d9b2e SDJ |
567 | static void |
568 | linux_enable_tracesysgood (ptid_t ptid) | |
569 | { | |
570 | int pid = ptid_get_lwp (ptid); | |
571 | ||
572 | if (pid == 0) | |
573 | pid = ptid_get_pid (ptid); | |
574 | ||
575 | if (linux_supports_tracesysgood (pid) == 0) | |
576 | return; | |
577 | ||
578 | current_ptrace_options |= PTRACE_O_TRACESYSGOOD; | |
579 | ||
580 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); | |
581 | } | |
582 | ||
3993f6b1 | 583 | \f |
4de4c07c DJ |
584 | void |
585 | linux_enable_event_reporting (ptid_t ptid) | |
586 | { | |
d3587048 | 587 | int pid = ptid_get_lwp (ptid); |
4de4c07c | 588 | |
d3587048 DJ |
589 | if (pid == 0) |
590 | pid = ptid_get_pid (ptid); | |
591 | ||
b957e937 | 592 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
593 | return; |
594 | ||
a96d9b2e SDJ |
595 | current_ptrace_options |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK |
596 | | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE; | |
597 | ||
b957e937 | 598 | if (linux_supports_tracevforkdone (pid)) |
a96d9b2e | 599 | current_ptrace_options |= PTRACE_O_TRACEVFORKDONE; |
9016a515 DJ |
600 | |
601 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
602 | read-only process state. */ | |
4de4c07c | 603 | |
a96d9b2e | 604 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); |
4de4c07c DJ |
605 | } |
606 | ||
6d8fd2b7 UW |
607 | static void |
608 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
609 | { |
610 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
0ec9a092 | 611 | check_for_thread_db (); |
a96d9b2e | 612 | linux_enable_tracesysgood (pid_to_ptid (pid)); |
4de4c07c DJ |
613 | } |
614 | ||
10d6c8cd | 615 | static void |
4de4c07c DJ |
616 | linux_child_post_startup_inferior (ptid_t ptid) |
617 | { | |
618 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 619 | check_for_thread_db (); |
a96d9b2e | 620 | linux_enable_tracesysgood (ptid); |
4de4c07c DJ |
621 | } |
622 | ||
6d8fd2b7 UW |
623 | static int |
624 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 625 | { |
7feb7d06 | 626 | sigset_t prev_mask; |
9016a515 | 627 | int has_vforked; |
4de4c07c DJ |
628 | int parent_pid, child_pid; |
629 | ||
7feb7d06 | 630 | block_child_signals (&prev_mask); |
b84876c2 | 631 | |
e58b0e63 PA |
632 | has_vforked = (inferior_thread ()->pending_follow.kind |
633 | == TARGET_WAITKIND_VFORKED); | |
634 | parent_pid = ptid_get_lwp (inferior_ptid); | |
d3587048 | 635 | if (parent_pid == 0) |
e58b0e63 PA |
636 | parent_pid = ptid_get_pid (inferior_ptid); |
637 | child_pid = PIDGET (inferior_thread ()->pending_follow.value.related_pid); | |
4de4c07c | 638 | |
2277426b PA |
639 | if (!detach_fork) |
640 | linux_enable_event_reporting (pid_to_ptid (child_pid)); | |
641 | ||
6c95b8df PA |
642 | if (has_vforked |
643 | && !non_stop /* Non-stop always resumes both branches. */ | |
644 | && (!target_is_async_p () || sync_execution) | |
645 | && !(follow_child || detach_fork || sched_multi)) | |
646 | { | |
647 | /* The parent stays blocked inside the vfork syscall until the | |
648 | child execs or exits. If we don't let the child run, then | |
649 | the parent stays blocked. If we're telling the parent to run | |
650 | in the foreground, the user will not be able to ctrl-c to get | |
651 | back the terminal, effectively hanging the debug session. */ | |
ac74f770 MS |
652 | fprintf_filtered (gdb_stderr, _("\ |
653 | Can not resume the parent process over vfork in the foreground while\n\ | |
654 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
655 | \"set schedule-multiple\".\n")); | |
656 | /* FIXME output string > 80 columns. */ | |
6c95b8df PA |
657 | return 1; |
658 | } | |
659 | ||
4de4c07c DJ |
660 | if (! follow_child) |
661 | { | |
6c95b8df | 662 | struct lwp_info *child_lp = NULL; |
4de4c07c | 663 | |
1777feb0 | 664 | /* We're already attached to the parent, by default. */ |
4de4c07c | 665 | |
ac264b3b MS |
666 | /* Detach new forked process? */ |
667 | if (detach_fork) | |
f75c00e4 | 668 | { |
6c95b8df PA |
669 | /* Before detaching from the child, remove all breakpoints |
670 | from it. If we forked, then this has already been taken | |
671 | care of by infrun.c. If we vforked however, any | |
672 | breakpoint inserted in the parent is visible in the | |
673 | child, even those added while stopped in a vfork | |
674 | catchpoint. This will remove the breakpoints from the | |
675 | parent also, but they'll be reinserted below. */ | |
676 | if (has_vforked) | |
677 | { | |
678 | /* keep breakpoints list in sync. */ | |
679 | remove_breakpoints_pid (GET_PID (inferior_ptid)); | |
680 | } | |
681 | ||
e85a822c | 682 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
683 | { |
684 | target_terminal_ours (); | |
685 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
686 | "Detaching after fork from " |
687 | "child process %d.\n", | |
ac264b3b MS |
688 | child_pid); |
689 | } | |
4de4c07c | 690 | |
ac264b3b MS |
691 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
692 | } | |
693 | else | |
694 | { | |
77435e4c | 695 | struct inferior *parent_inf, *child_inf; |
2277426b | 696 | struct cleanup *old_chain; |
7f9f62ba PA |
697 | |
698 | /* Add process to GDB's tables. */ | |
77435e4c PA |
699 | child_inf = add_inferior (child_pid); |
700 | ||
e58b0e63 | 701 | parent_inf = current_inferior (); |
77435e4c | 702 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 703 | copy_terminal_info (child_inf, parent_inf); |
7f9f62ba | 704 | |
2277426b | 705 | old_chain = save_inferior_ptid (); |
6c95b8df | 706 | save_current_program_space (); |
2277426b PA |
707 | |
708 | inferior_ptid = ptid_build (child_pid, child_pid, 0); | |
709 | add_thread (inferior_ptid); | |
6c95b8df PA |
710 | child_lp = add_lwp (inferior_ptid); |
711 | child_lp->stopped = 1; | |
712 | child_lp->resumed = 1; | |
2277426b | 713 | |
6c95b8df PA |
714 | /* If this is a vfork child, then the address-space is |
715 | shared with the parent. */ | |
716 | if (has_vforked) | |
717 | { | |
718 | child_inf->pspace = parent_inf->pspace; | |
719 | child_inf->aspace = parent_inf->aspace; | |
720 | ||
721 | /* The parent will be frozen until the child is done | |
722 | with the shared region. Keep track of the | |
723 | parent. */ | |
724 | child_inf->vfork_parent = parent_inf; | |
725 | child_inf->pending_detach = 0; | |
726 | parent_inf->vfork_child = child_inf; | |
727 | parent_inf->pending_detach = 0; | |
728 | } | |
729 | else | |
730 | { | |
731 | child_inf->aspace = new_address_space (); | |
732 | child_inf->pspace = add_program_space (child_inf->aspace); | |
733 | child_inf->removable = 1; | |
734 | set_current_program_space (child_inf->pspace); | |
735 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
736 | ||
737 | /* Let the shared library layer (solib-svr4) learn about | |
738 | this new process, relocate the cloned exec, pull in | |
739 | shared libraries, and install the solib event | |
740 | breakpoint. If a "cloned-VM" event was propagated | |
741 | better throughout the core, this wouldn't be | |
742 | required. */ | |
268a4a75 | 743 | solib_create_inferior_hook (0); |
6c95b8df PA |
744 | } |
745 | ||
746 | /* Let the thread_db layer learn about this new process. */ | |
2277426b PA |
747 | check_for_thread_db (); |
748 | ||
749 | do_cleanups (old_chain); | |
ac264b3b | 750 | } |
9016a515 DJ |
751 | |
752 | if (has_vforked) | |
753 | { | |
6c95b8df PA |
754 | struct lwp_info *lp; |
755 | struct inferior *parent_inf; | |
756 | ||
757 | parent_inf = current_inferior (); | |
758 | ||
759 | /* If we detached from the child, then we have to be careful | |
760 | to not insert breakpoints in the parent until the child | |
761 | is done with the shared memory region. However, if we're | |
762 | staying attached to the child, then we can and should | |
763 | insert breakpoints, so that we can debug it. A | |
764 | subsequent child exec or exit is enough to know when does | |
765 | the child stops using the parent's address space. */ | |
766 | parent_inf->waiting_for_vfork_done = detach_fork; | |
56710373 | 767 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
6c95b8df PA |
768 | |
769 | lp = find_lwp_pid (pid_to_ptid (parent_pid)); | |
b957e937 DJ |
770 | gdb_assert (linux_supports_tracefork_flag >= 0); |
771 | if (linux_supports_tracevforkdone (0)) | |
9016a515 | 772 | { |
6c95b8df PA |
773 | if (debug_linux_nat) |
774 | fprintf_unfiltered (gdb_stdlog, | |
775 | "LCFF: waiting for VFORK_DONE on %d\n", | |
776 | parent_pid); | |
777 | ||
778 | lp->stopped = 1; | |
779 | lp->resumed = 1; | |
9016a515 | 780 | |
6c95b8df PA |
781 | /* We'll handle the VFORK_DONE event like any other |
782 | event, in target_wait. */ | |
9016a515 DJ |
783 | } |
784 | else | |
785 | { | |
786 | /* We can't insert breakpoints until the child has | |
787 | finished with the shared memory region. We need to | |
788 | wait until that happens. Ideal would be to just | |
789 | call: | |
790 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
791 | - waitpid (parent_pid, &status, __WALL); | |
792 | However, most architectures can't handle a syscall | |
793 | being traced on the way out if it wasn't traced on | |
794 | the way in. | |
795 | ||
796 | We might also think to loop, continuing the child | |
797 | until it exits or gets a SIGTRAP. One problem is | |
798 | that the child might call ptrace with PTRACE_TRACEME. | |
799 | ||
800 | There's no simple and reliable way to figure out when | |
801 | the vforked child will be done with its copy of the | |
802 | shared memory. We could step it out of the syscall, | |
803 | two instructions, let it go, and then single-step the | |
804 | parent once. When we have hardware single-step, this | |
805 | would work; with software single-step it could still | |
806 | be made to work but we'd have to be able to insert | |
807 | single-step breakpoints in the child, and we'd have | |
808 | to insert -just- the single-step breakpoint in the | |
809 | parent. Very awkward. | |
810 | ||
811 | In the end, the best we can do is to make sure it | |
812 | runs for a little while. Hopefully it will be out of | |
813 | range of any breakpoints we reinsert. Usually this | |
814 | is only the single-step breakpoint at vfork's return | |
815 | point. */ | |
816 | ||
6c95b8df PA |
817 | if (debug_linux_nat) |
818 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
819 | "LCFF: no VFORK_DONE " |
820 | "support, sleeping a bit\n"); | |
6c95b8df | 821 | |
9016a515 | 822 | usleep (10000); |
9016a515 | 823 | |
6c95b8df PA |
824 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
825 | and leave it pending. The next linux_nat_resume call | |
826 | will notice a pending event, and bypasses actually | |
827 | resuming the inferior. */ | |
828 | lp->status = 0; | |
829 | lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
830 | lp->stopped = 0; | |
831 | lp->resumed = 1; | |
832 | ||
833 | /* If we're in async mode, need to tell the event loop | |
834 | there's something here to process. */ | |
835 | if (target_can_async_p ()) | |
836 | async_file_mark (); | |
837 | } | |
9016a515 | 838 | } |
4de4c07c | 839 | } |
3993f6b1 | 840 | else |
4de4c07c | 841 | { |
77435e4c | 842 | struct inferior *parent_inf, *child_inf; |
2277426b | 843 | struct lwp_info *lp; |
6c95b8df | 844 | struct program_space *parent_pspace; |
4de4c07c | 845 | |
e85a822c | 846 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
847 | { |
848 | target_terminal_ours (); | |
6c95b8df | 849 | if (has_vforked) |
3e43a32a MS |
850 | fprintf_filtered (gdb_stdlog, |
851 | _("Attaching after process %d " | |
852 | "vfork to child process %d.\n"), | |
6c95b8df PA |
853 | parent_pid, child_pid); |
854 | else | |
3e43a32a MS |
855 | fprintf_filtered (gdb_stdlog, |
856 | _("Attaching after process %d " | |
857 | "fork to child process %d.\n"), | |
6c95b8df | 858 | parent_pid, child_pid); |
f75c00e4 | 859 | } |
4de4c07c | 860 | |
7a7d3353 PA |
861 | /* Add the new inferior first, so that the target_detach below |
862 | doesn't unpush the target. */ | |
863 | ||
77435e4c PA |
864 | child_inf = add_inferior (child_pid); |
865 | ||
e58b0e63 | 866 | parent_inf = current_inferior (); |
77435e4c | 867 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 868 | copy_terminal_info (child_inf, parent_inf); |
7a7d3353 | 869 | |
6c95b8df | 870 | parent_pspace = parent_inf->pspace; |
9016a515 | 871 | |
6c95b8df PA |
872 | /* If we're vforking, we want to hold on to the parent until the |
873 | child exits or execs. At child exec or exit time we can | |
874 | remove the old breakpoints from the parent and detach or | |
875 | resume debugging it. Otherwise, detach the parent now; we'll | |
876 | want to reuse it's program/address spaces, but we can't set | |
877 | them to the child before removing breakpoints from the | |
878 | parent, otherwise, the breakpoints module could decide to | |
879 | remove breakpoints from the wrong process (since they'd be | |
880 | assigned to the same address space). */ | |
9016a515 DJ |
881 | |
882 | if (has_vforked) | |
7f9f62ba | 883 | { |
6c95b8df PA |
884 | gdb_assert (child_inf->vfork_parent == NULL); |
885 | gdb_assert (parent_inf->vfork_child == NULL); | |
886 | child_inf->vfork_parent = parent_inf; | |
887 | child_inf->pending_detach = 0; | |
888 | parent_inf->vfork_child = child_inf; | |
889 | parent_inf->pending_detach = detach_fork; | |
890 | parent_inf->waiting_for_vfork_done = 0; | |
ac264b3b | 891 | } |
2277426b | 892 | else if (detach_fork) |
b84876c2 | 893 | target_detach (NULL, 0); |
4de4c07c | 894 | |
6c95b8df PA |
895 | /* Note that the detach above makes PARENT_INF dangling. */ |
896 | ||
897 | /* Add the child thread to the appropriate lists, and switch to | |
898 | this new thread, before cloning the program space, and | |
899 | informing the solib layer about this new process. */ | |
900 | ||
9f0bdab8 | 901 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
2277426b PA |
902 | add_thread (inferior_ptid); |
903 | lp = add_lwp (inferior_ptid); | |
904 | lp->stopped = 1; | |
6c95b8df PA |
905 | lp->resumed = 1; |
906 | ||
907 | /* If this is a vfork child, then the address-space is shared | |
908 | with the parent. If we detached from the parent, then we can | |
909 | reuse the parent's program/address spaces. */ | |
910 | if (has_vforked || detach_fork) | |
911 | { | |
912 | child_inf->pspace = parent_pspace; | |
913 | child_inf->aspace = child_inf->pspace->aspace; | |
914 | } | |
915 | else | |
916 | { | |
917 | child_inf->aspace = new_address_space (); | |
918 | child_inf->pspace = add_program_space (child_inf->aspace); | |
919 | child_inf->removable = 1; | |
920 | set_current_program_space (child_inf->pspace); | |
921 | clone_program_space (child_inf->pspace, parent_pspace); | |
922 | ||
923 | /* Let the shared library layer (solib-svr4) learn about | |
924 | this new process, relocate the cloned exec, pull in | |
925 | shared libraries, and install the solib event breakpoint. | |
926 | If a "cloned-VM" event was propagated better throughout | |
927 | the core, this wouldn't be required. */ | |
268a4a75 | 928 | solib_create_inferior_hook (0); |
6c95b8df | 929 | } |
ac264b3b | 930 | |
6c95b8df | 931 | /* Let the thread_db layer learn about this new process. */ |
ef29ce1a | 932 | check_for_thread_db (); |
4de4c07c DJ |
933 | } |
934 | ||
7feb7d06 | 935 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
936 | return 0; |
937 | } | |
938 | ||
4de4c07c | 939 | \f |
77b06cd7 | 940 | static int |
6d8fd2b7 | 941 | linux_child_insert_fork_catchpoint (int pid) |
4de4c07c | 942 | { |
77b06cd7 | 943 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
944 | } |
945 | ||
77b06cd7 | 946 | static int |
6d8fd2b7 | 947 | linux_child_insert_vfork_catchpoint (int pid) |
3993f6b1 | 948 | { |
77b06cd7 | 949 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
950 | } |
951 | ||
77b06cd7 | 952 | static int |
6d8fd2b7 | 953 | linux_child_insert_exec_catchpoint (int pid) |
3993f6b1 | 954 | { |
77b06cd7 | 955 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
956 | } |
957 | ||
a96d9b2e SDJ |
958 | static int |
959 | linux_child_set_syscall_catchpoint (int pid, int needed, int any_count, | |
960 | int table_size, int *table) | |
961 | { | |
77b06cd7 TJB |
962 | if (!linux_supports_tracesysgood (pid)) |
963 | return 1; | |
964 | ||
a96d9b2e SDJ |
965 | /* On GNU/Linux, we ignore the arguments. It means that we only |
966 | enable the syscall catchpoints, but do not disable them. | |
77b06cd7 | 967 | |
a96d9b2e SDJ |
968 | Also, we do not use the `table' information because we do not |
969 | filter system calls here. We let GDB do the logic for us. */ | |
970 | return 0; | |
971 | } | |
972 | ||
d6b0e80f AC |
973 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
974 | are processes sharing the same VM space. A multi-threaded process | |
975 | is basically a group of such processes. However, such a grouping | |
976 | is almost entirely a user-space issue; the kernel doesn't enforce | |
977 | such a grouping at all (this might change in the future). In | |
978 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
979 | Threads library) to provide such a grouping. | |
980 | ||
981 | It is perfectly well possible to write a multi-threaded application | |
982 | without the assistance of a threads library, by using the clone | |
983 | system call directly. This module should be able to give some | |
984 | rudimentary support for debugging such applications if developers | |
985 | specify the CLONE_PTRACE flag in the clone system call, and are | |
986 | using the Linux kernel 2.4 or above. | |
987 | ||
988 | Note that there are some peculiarities in GNU/Linux that affect | |
989 | this code: | |
990 | ||
991 | - In general one should specify the __WCLONE flag to waitpid in | |
992 | order to make it report events for any of the cloned processes | |
993 | (and leave it out for the initial process). However, if a cloned | |
994 | process has exited the exit status is only reported if the | |
995 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
996 | we cannot use it since GDB must work on older systems too. | |
997 | ||
998 | - When a traced, cloned process exits and is waited for by the | |
999 | debugger, the kernel reassigns it to the original parent and | |
1000 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
1001 | library doesn't notice this, which leads to the "zombie problem": | |
1002 | When debugged a multi-threaded process that spawns a lot of | |
1003 | threads will run out of processes, even if the threads exit, | |
1004 | because the "zombies" stay around. */ | |
1005 | ||
1006 | /* List of known LWPs. */ | |
9f0bdab8 | 1007 | struct lwp_info *lwp_list; |
d6b0e80f AC |
1008 | \f |
1009 | ||
d6b0e80f AC |
1010 | /* Original signal mask. */ |
1011 | static sigset_t normal_mask; | |
1012 | ||
1013 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
1014 | _initialize_linux_nat. */ | |
1015 | static sigset_t suspend_mask; | |
1016 | ||
7feb7d06 PA |
1017 | /* Signals to block to make that sigsuspend work. */ |
1018 | static sigset_t blocked_mask; | |
1019 | ||
1020 | /* SIGCHLD action. */ | |
1021 | struct sigaction sigchld_action; | |
b84876c2 | 1022 | |
7feb7d06 PA |
1023 | /* Block child signals (SIGCHLD and linux threads signals), and store |
1024 | the previous mask in PREV_MASK. */ | |
84e46146 | 1025 | |
7feb7d06 PA |
1026 | static void |
1027 | block_child_signals (sigset_t *prev_mask) | |
1028 | { | |
1029 | /* Make sure SIGCHLD is blocked. */ | |
1030 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
1031 | sigaddset (&blocked_mask, SIGCHLD); | |
1032 | ||
1033 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
1034 | } | |
1035 | ||
1036 | /* Restore child signals mask, previously returned by | |
1037 | block_child_signals. */ | |
1038 | ||
1039 | static void | |
1040 | restore_child_signals_mask (sigset_t *prev_mask) | |
1041 | { | |
1042 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
1043 | } | |
d6b0e80f AC |
1044 | \f |
1045 | ||
1046 | /* Prototypes for local functions. */ | |
1047 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 1048 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 1049 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd | 1050 | |
d6b0e80f AC |
1051 | \f |
1052 | /* Convert wait status STATUS to a string. Used for printing debug | |
1053 | messages only. */ | |
1054 | ||
1055 | static char * | |
1056 | status_to_str (int status) | |
1057 | { | |
1058 | static char buf[64]; | |
1059 | ||
1060 | if (WIFSTOPPED (status)) | |
206aa767 | 1061 | { |
ca2163eb | 1062 | if (WSTOPSIG (status) == SYSCALL_SIGTRAP) |
206aa767 DE |
1063 | snprintf (buf, sizeof (buf), "%s (stopped at syscall)", |
1064 | strsignal (SIGTRAP)); | |
1065 | else | |
1066 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
1067 | strsignal (WSTOPSIG (status))); | |
1068 | } | |
d6b0e80f AC |
1069 | else if (WIFSIGNALED (status)) |
1070 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
ba9b2ec3 | 1071 | strsignal (WTERMSIG (status))); |
d6b0e80f AC |
1072 | else |
1073 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
1074 | ||
1075 | return buf; | |
1076 | } | |
1077 | ||
d90e17a7 PA |
1078 | /* Remove all LWPs belong to PID from the lwp list. */ |
1079 | ||
1080 | static void | |
1081 | purge_lwp_list (int pid) | |
1082 | { | |
1083 | struct lwp_info *lp, *lpprev, *lpnext; | |
1084 | ||
1085 | lpprev = NULL; | |
1086 | ||
1087 | for (lp = lwp_list; lp; lp = lpnext) | |
1088 | { | |
1089 | lpnext = lp->next; | |
1090 | ||
1091 | if (ptid_get_pid (lp->ptid) == pid) | |
1092 | { | |
1093 | if (lp == lwp_list) | |
1094 | lwp_list = lp->next; | |
1095 | else | |
1096 | lpprev->next = lp->next; | |
1097 | ||
1098 | xfree (lp); | |
1099 | } | |
1100 | else | |
1101 | lpprev = lp; | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | /* Return the number of known LWPs in the tgid given by PID. */ | |
1106 | ||
1107 | static int | |
1108 | num_lwps (int pid) | |
1109 | { | |
1110 | int count = 0; | |
1111 | struct lwp_info *lp; | |
1112 | ||
1113 | for (lp = lwp_list; lp; lp = lp->next) | |
1114 | if (ptid_get_pid (lp->ptid) == pid) | |
1115 | count++; | |
1116 | ||
1117 | return count; | |
d6b0e80f AC |
1118 | } |
1119 | ||
f973ed9c | 1120 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1121 | structure describing the new LWP. The LWP should already be stopped |
1122 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1123 | |
1124 | static struct lwp_info * | |
1125 | add_lwp (ptid_t ptid) | |
1126 | { | |
1127 | struct lwp_info *lp; | |
1128 | ||
1129 | gdb_assert (is_lwp (ptid)); | |
1130 | ||
1131 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1132 | ||
1133 | memset (lp, 0, sizeof (struct lwp_info)); | |
1134 | ||
1135 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1136 | ||
1137 | lp->ptid = ptid; | |
dc146f7c | 1138 | lp->core = -1; |
d6b0e80f AC |
1139 | |
1140 | lp->next = lwp_list; | |
1141 | lwp_list = lp; | |
d6b0e80f | 1142 | |
d90e17a7 | 1143 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1144 | linux_nat_new_thread (ptid); |
1145 | ||
d6b0e80f AC |
1146 | return lp; |
1147 | } | |
1148 | ||
1149 | /* Remove the LWP specified by PID from the list. */ | |
1150 | ||
1151 | static void | |
1152 | delete_lwp (ptid_t ptid) | |
1153 | { | |
1154 | struct lwp_info *lp, *lpprev; | |
1155 | ||
1156 | lpprev = NULL; | |
1157 | ||
1158 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1159 | if (ptid_equal (lp->ptid, ptid)) | |
1160 | break; | |
1161 | ||
1162 | if (!lp) | |
1163 | return; | |
1164 | ||
d6b0e80f AC |
1165 | if (lpprev) |
1166 | lpprev->next = lp->next; | |
1167 | else | |
1168 | lwp_list = lp->next; | |
1169 | ||
1170 | xfree (lp); | |
1171 | } | |
1172 | ||
1173 | /* Return a pointer to the structure describing the LWP corresponding | |
1174 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1175 | ||
1176 | static struct lwp_info * | |
1177 | find_lwp_pid (ptid_t ptid) | |
1178 | { | |
1179 | struct lwp_info *lp; | |
1180 | int lwp; | |
1181 | ||
1182 | if (is_lwp (ptid)) | |
1183 | lwp = GET_LWP (ptid); | |
1184 | else | |
1185 | lwp = GET_PID (ptid); | |
1186 | ||
1187 | for (lp = lwp_list; lp; lp = lp->next) | |
1188 | if (lwp == GET_LWP (lp->ptid)) | |
1189 | return lp; | |
1190 | ||
1191 | return NULL; | |
1192 | } | |
1193 | ||
1194 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
1195 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1196 | pointer to the structure describing that LWP immediately. | |
1197 | Otherwise return NULL. */ | |
1198 | ||
1199 | struct lwp_info * | |
d90e17a7 PA |
1200 | iterate_over_lwps (ptid_t filter, |
1201 | int (*callback) (struct lwp_info *, void *), | |
1202 | void *data) | |
d6b0e80f AC |
1203 | { |
1204 | struct lwp_info *lp, *lpnext; | |
1205 | ||
1206 | for (lp = lwp_list; lp; lp = lpnext) | |
1207 | { | |
1208 | lpnext = lp->next; | |
d90e17a7 PA |
1209 | |
1210 | if (ptid_match (lp->ptid, filter)) | |
1211 | { | |
1212 | if ((*callback) (lp, data)) | |
1213 | return lp; | |
1214 | } | |
d6b0e80f AC |
1215 | } |
1216 | ||
1217 | return NULL; | |
1218 | } | |
1219 | ||
2277426b PA |
1220 | /* Update our internal state when changing from one checkpoint to |
1221 | another indicated by NEW_PTID. We can only switch single-threaded | |
1222 | applications, so we only create one new LWP, and the previous list | |
1223 | is discarded. */ | |
f973ed9c DJ |
1224 | |
1225 | void | |
1226 | linux_nat_switch_fork (ptid_t new_ptid) | |
1227 | { | |
1228 | struct lwp_info *lp; | |
1229 | ||
2277426b PA |
1230 | purge_lwp_list (GET_PID (inferior_ptid)); |
1231 | ||
f973ed9c DJ |
1232 | lp = add_lwp (new_ptid); |
1233 | lp->stopped = 1; | |
e26af52f | 1234 | |
2277426b PA |
1235 | /* This changes the thread's ptid while preserving the gdb thread |
1236 | num. Also changes the inferior pid, while preserving the | |
1237 | inferior num. */ | |
1238 | thread_change_ptid (inferior_ptid, new_ptid); | |
1239 | ||
1240 | /* We've just told GDB core that the thread changed target id, but, | |
1241 | in fact, it really is a different thread, with different register | |
1242 | contents. */ | |
1243 | registers_changed (); | |
e26af52f DJ |
1244 | } |
1245 | ||
e26af52f DJ |
1246 | /* Handle the exit of a single thread LP. */ |
1247 | ||
1248 | static void | |
1249 | exit_lwp (struct lwp_info *lp) | |
1250 | { | |
e09875d4 | 1251 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1252 | |
1253 | if (th) | |
e26af52f | 1254 | { |
17faa917 DJ |
1255 | if (print_thread_events) |
1256 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1257 | ||
4f8d22e3 | 1258 | delete_thread (lp->ptid); |
e26af52f DJ |
1259 | } |
1260 | ||
1261 | delete_lwp (lp->ptid); | |
1262 | } | |
1263 | ||
4d062f1a PA |
1264 | /* Return an lwp's tgid, found in `/proc/PID/status'. */ |
1265 | ||
1266 | int | |
1267 | linux_proc_get_tgid (int lwpid) | |
1268 | { | |
1269 | FILE *status_file; | |
1270 | char buf[100]; | |
1271 | int tgid = -1; | |
1272 | ||
1273 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); | |
1274 | status_file = fopen (buf, "r"); | |
1275 | if (status_file != NULL) | |
1276 | { | |
1277 | while (fgets (buf, sizeof (buf), status_file)) | |
1278 | { | |
1279 | if (strncmp (buf, "Tgid:", 5) == 0) | |
1280 | { | |
1281 | tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10); | |
1282 | break; | |
1283 | } | |
1284 | } | |
1285 | ||
1286 | fclose (status_file); | |
1287 | } | |
1288 | ||
1289 | return tgid; | |
1290 | } | |
1291 | ||
a0ef4274 DJ |
1292 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1293 | Other states including `T (tracing stop)' are reported as false. */ | |
1294 | ||
1295 | static int | |
1296 | pid_is_stopped (pid_t pid) | |
1297 | { | |
1298 | FILE *status_file; | |
1299 | char buf[100]; | |
1300 | int retval = 0; | |
1301 | ||
1302 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1303 | status_file = fopen (buf, "r"); | |
1304 | if (status_file != NULL) | |
1305 | { | |
1306 | int have_state = 0; | |
1307 | ||
1308 | while (fgets (buf, sizeof (buf), status_file)) | |
1309 | { | |
1310 | if (strncmp (buf, "State:", 6) == 0) | |
1311 | { | |
1312 | have_state = 1; | |
1313 | break; | |
1314 | } | |
1315 | } | |
1316 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1317 | retval = 1; | |
1318 | fclose (status_file); | |
1319 | } | |
1320 | return retval; | |
1321 | } | |
1322 | ||
1323 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1324 | Returns a wait status for that LWP, to cache. */ | |
1325 | ||
1326 | static int | |
1327 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1328 | int *signalled) | |
1329 | { | |
1330 | pid_t new_pid, pid = GET_LWP (ptid); | |
1331 | int status; | |
1332 | ||
1333 | if (pid_is_stopped (pid)) | |
1334 | { | |
1335 | if (debug_linux_nat) | |
1336 | fprintf_unfiltered (gdb_stdlog, | |
1337 | "LNPAW: Attaching to a stopped process\n"); | |
1338 | ||
1339 | /* The process is definitely stopped. It is in a job control | |
1340 | stop, unless the kernel predates the TASK_STOPPED / | |
1341 | TASK_TRACED distinction, in which case it might be in a | |
1342 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1343 | can kill it, signal it, et cetera. | |
1344 | ||
1345 | First make sure there is a pending SIGSTOP. Since we are | |
1346 | already attached, the process can not transition from stopped | |
1347 | to running without a PTRACE_CONT; so we know this signal will | |
1348 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1349 | probably already in the queue (unless this kernel is old | |
1350 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1351 | is not an RT signal, it can only be queued once. */ | |
1352 | kill_lwp (pid, SIGSTOP); | |
1353 | ||
1354 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1355 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1356 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1357 | } | |
1358 | ||
1359 | /* Make sure the initial process is stopped. The user-level threads | |
1360 | layer might want to poke around in the inferior, and that won't | |
1361 | work if things haven't stabilized yet. */ | |
1362 | new_pid = my_waitpid (pid, &status, 0); | |
1363 | if (new_pid == -1 && errno == ECHILD) | |
1364 | { | |
1365 | if (first) | |
1366 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1367 | ||
1368 | /* Try again with __WCLONE to check cloned processes. */ | |
1369 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1370 | *cloned = 1; | |
1371 | } | |
1372 | ||
dacc9cb2 PP |
1373 | gdb_assert (pid == new_pid); |
1374 | ||
1375 | if (!WIFSTOPPED (status)) | |
1376 | { | |
1377 | /* The pid we tried to attach has apparently just exited. */ | |
1378 | if (debug_linux_nat) | |
1379 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1380 | pid, status_to_str (status)); | |
1381 | return status; | |
1382 | } | |
a0ef4274 DJ |
1383 | |
1384 | if (WSTOPSIG (status) != SIGSTOP) | |
1385 | { | |
1386 | *signalled = 1; | |
1387 | if (debug_linux_nat) | |
1388 | fprintf_unfiltered (gdb_stdlog, | |
1389 | "LNPAW: Received %s after attaching\n", | |
1390 | status_to_str (status)); | |
1391 | } | |
1392 | ||
1393 | return status; | |
1394 | } | |
1395 | ||
1396 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1397 | if the new LWP could not be attached. */ | |
d6b0e80f | 1398 | |
9ee57c33 | 1399 | int |
93815fbf | 1400 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1401 | { |
9ee57c33 | 1402 | struct lwp_info *lp; |
7feb7d06 | 1403 | sigset_t prev_mask; |
d6b0e80f AC |
1404 | |
1405 | gdb_assert (is_lwp (ptid)); | |
1406 | ||
7feb7d06 | 1407 | block_child_signals (&prev_mask); |
d6b0e80f | 1408 | |
9ee57c33 | 1409 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1410 | |
1411 | /* We assume that we're already attached to any LWP that has an id | |
1412 | equal to the overall process id, and to any LWP that is already | |
1413 | in our list of LWPs. If we're not seeing exit events from threads | |
1414 | and we've had PID wraparound since we last tried to stop all threads, | |
1415 | this assumption might be wrong; fortunately, this is very unlikely | |
1416 | to happen. */ | |
9ee57c33 | 1417 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1418 | { |
a0ef4274 | 1419 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1420 | |
1421 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1422 | { |
1423 | /* If we fail to attach to the thread, issue a warning, | |
1424 | but continue. One way this can happen is if thread | |
e9efe249 | 1425 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1426 | bug may place threads in the thread list and then fail |
1427 | to create them. */ | |
1428 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1429 | safe_strerror (errno)); | |
7feb7d06 | 1430 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1431 | return -1; |
1432 | } | |
1433 | ||
d6b0e80f AC |
1434 | if (debug_linux_nat) |
1435 | fprintf_unfiltered (gdb_stdlog, | |
1436 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1437 | target_pid_to_str (ptid)); | |
1438 | ||
a0ef4274 | 1439 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
dacc9cb2 PP |
1440 | if (!WIFSTOPPED (status)) |
1441 | return -1; | |
1442 | ||
a0ef4274 DJ |
1443 | lp = add_lwp (ptid); |
1444 | lp->stopped = 1; | |
1445 | lp->cloned = cloned; | |
1446 | lp->signalled = signalled; | |
1447 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1448 | { |
a0ef4274 DJ |
1449 | lp->resumed = 1; |
1450 | lp->status = status; | |
d6b0e80f AC |
1451 | } |
1452 | ||
a0ef4274 | 1453 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1454 | |
1455 | if (debug_linux_nat) | |
1456 | { | |
1457 | fprintf_unfiltered (gdb_stdlog, | |
1458 | "LLAL: waitpid %s received %s\n", | |
1459 | target_pid_to_str (ptid), | |
1460 | status_to_str (status)); | |
1461 | } | |
1462 | } | |
1463 | else | |
1464 | { | |
1465 | /* We assume that the LWP representing the original process is | |
1466 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1467 | that the GNU/linux ptrace layer uses to keep track of |
1468 | threads. Note that this won't have already been done since | |
1469 | the main thread will have, we assume, been stopped by an | |
1470 | attach from a different layer. */ | |
9ee57c33 DJ |
1471 | if (lp == NULL) |
1472 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1473 | lp->stopped = 1; |
1474 | } | |
9ee57c33 | 1475 | |
7feb7d06 | 1476 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1477 | return 0; |
d6b0e80f AC |
1478 | } |
1479 | ||
b84876c2 | 1480 | static void |
136d6dae VP |
1481 | linux_nat_create_inferior (struct target_ops *ops, |
1482 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1483 | int from_tty) |
1484 | { | |
10568435 JK |
1485 | #ifdef HAVE_PERSONALITY |
1486 | int personality_orig = 0, personality_set = 0; | |
1487 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1488 | |
1489 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1490 | we have to mask the async mode. */ | |
1491 | ||
10568435 JK |
1492 | #ifdef HAVE_PERSONALITY |
1493 | if (disable_randomization) | |
1494 | { | |
1495 | errno = 0; | |
1496 | personality_orig = personality (0xffffffff); | |
1497 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1498 | { | |
1499 | personality_set = 1; | |
1500 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1501 | } | |
1502 | if (errno != 0 || (personality_set | |
1503 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1504 | warning (_("Error disabling address space randomization: %s"), | |
1505 | safe_strerror (errno)); | |
1506 | } | |
1507 | #endif /* HAVE_PERSONALITY */ | |
1508 | ||
136d6dae | 1509 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1510 | |
10568435 JK |
1511 | #ifdef HAVE_PERSONALITY |
1512 | if (personality_set) | |
1513 | { | |
1514 | errno = 0; | |
1515 | personality (personality_orig); | |
1516 | if (errno != 0) | |
1517 | warning (_("Error restoring address space randomization: %s"), | |
1518 | safe_strerror (errno)); | |
1519 | } | |
1520 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1521 | } |
1522 | ||
d6b0e80f | 1523 | static void |
136d6dae | 1524 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1525 | { |
1526 | struct lwp_info *lp; | |
d6b0e80f | 1527 | int status; |
af990527 | 1528 | ptid_t ptid; |
d6b0e80f | 1529 | |
136d6dae | 1530 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1531 | |
af990527 PA |
1532 | /* The ptrace base target adds the main thread with (pid,0,0) |
1533 | format. Decorate it with lwp info. */ | |
1534 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1535 | thread_change_ptid (inferior_ptid, ptid); | |
1536 | ||
9f0bdab8 | 1537 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1538 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1539 | |
1540 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1541 | &lp->signalled); | |
dacc9cb2 PP |
1542 | if (!WIFSTOPPED (status)) |
1543 | { | |
1544 | if (WIFEXITED (status)) | |
1545 | { | |
1546 | int exit_code = WEXITSTATUS (status); | |
1547 | ||
1548 | target_terminal_ours (); | |
1549 | target_mourn_inferior (); | |
1550 | if (exit_code == 0) | |
1551 | error (_("Unable to attach: program exited normally.")); | |
1552 | else | |
1553 | error (_("Unable to attach: program exited with code %d."), | |
1554 | exit_code); | |
1555 | } | |
1556 | else if (WIFSIGNALED (status)) | |
1557 | { | |
1558 | enum target_signal signo; | |
1559 | ||
1560 | target_terminal_ours (); | |
1561 | target_mourn_inferior (); | |
1562 | ||
1563 | signo = target_signal_from_host (WTERMSIG (status)); | |
1564 | error (_("Unable to attach: program terminated with signal " | |
1565 | "%s, %s."), | |
1566 | target_signal_to_name (signo), | |
1567 | target_signal_to_string (signo)); | |
1568 | } | |
1569 | ||
1570 | internal_error (__FILE__, __LINE__, | |
1571 | _("unexpected status %d for PID %ld"), | |
1572 | status, (long) GET_LWP (ptid)); | |
1573 | } | |
1574 | ||
a0ef4274 | 1575 | lp->stopped = 1; |
9f0bdab8 | 1576 | |
a0ef4274 | 1577 | /* Save the wait status to report later. */ |
d6b0e80f | 1578 | lp->resumed = 1; |
a0ef4274 DJ |
1579 | if (debug_linux_nat) |
1580 | fprintf_unfiltered (gdb_stdlog, | |
1581 | "LNA: waitpid %ld, saving status %s\n", | |
1582 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1583 | |
7feb7d06 PA |
1584 | lp->status = status; |
1585 | ||
1586 | if (target_can_async_p ()) | |
1587 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1588 | } |
1589 | ||
a0ef4274 DJ |
1590 | /* Get pending status of LP. */ |
1591 | static int | |
1592 | get_pending_status (struct lwp_info *lp, int *status) | |
1593 | { | |
ca2163eb PA |
1594 | enum target_signal signo = TARGET_SIGNAL_0; |
1595 | ||
1596 | /* If we paused threads momentarily, we may have stored pending | |
1597 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1598 | and GDB core hasn't seen any signal for those threads. | |
1599 | Otherwise, the last signal reported to the core is found in the | |
1600 | thread object's stop_signal. | |
1601 | ||
1602 | There's a corner case that isn't handled here at present. Only | |
1603 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1604 | stop_signal make sense as a real signal to pass to the inferior. | |
1605 | Some catchpoint related events, like | |
1606 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
1607 | to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But, | |
1608 | those traps are debug API (ptrace in our case) related and | |
1609 | induced; the inferior wouldn't see them if it wasn't being | |
1610 | traced. Hence, we should never pass them to the inferior, even | |
1611 | when set to pass state. Since this corner case isn't handled by | |
1612 | infrun.c when proceeding with a signal, for consistency, neither | |
1613 | do we handle it here (or elsewhere in the file we check for | |
1614 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1615 | this is really a corner case. */ | |
1616 | ||
1617 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
1618 | signo = TARGET_SIGNAL_0; /* a pending ptrace event, not a real signal. */ | |
1619 | else if (lp->status) | |
1620 | signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1621 | else if (non_stop && !is_executing (lp->ptid)) | |
1622 | { | |
1623 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
e0881a8e | 1624 | |
16c381f0 | 1625 | signo = tp->suspend.stop_signal; |
ca2163eb PA |
1626 | } |
1627 | else if (!non_stop) | |
a0ef4274 | 1628 | { |
ca2163eb PA |
1629 | struct target_waitstatus last; |
1630 | ptid_t last_ptid; | |
4c28f408 | 1631 | |
ca2163eb | 1632 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1633 | |
ca2163eb PA |
1634 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) |
1635 | { | |
e09875d4 | 1636 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
e0881a8e | 1637 | |
16c381f0 | 1638 | signo = tp->suspend.stop_signal; |
4c28f408 | 1639 | } |
ca2163eb | 1640 | } |
4c28f408 | 1641 | |
ca2163eb | 1642 | *status = 0; |
4c28f408 | 1643 | |
ca2163eb PA |
1644 | if (signo == TARGET_SIGNAL_0) |
1645 | { | |
1646 | if (debug_linux_nat) | |
1647 | fprintf_unfiltered (gdb_stdlog, | |
1648 | "GPT: lwp %s has no pending signal\n", | |
1649 | target_pid_to_str (lp->ptid)); | |
1650 | } | |
1651 | else if (!signal_pass_state (signo)) | |
1652 | { | |
1653 | if (debug_linux_nat) | |
3e43a32a MS |
1654 | fprintf_unfiltered (gdb_stdlog, |
1655 | "GPT: lwp %s had signal %s, " | |
1656 | "but it is in no pass state\n", | |
ca2163eb PA |
1657 | target_pid_to_str (lp->ptid), |
1658 | target_signal_to_string (signo)); | |
a0ef4274 | 1659 | } |
a0ef4274 | 1660 | else |
4c28f408 | 1661 | { |
ca2163eb PA |
1662 | *status = W_STOPCODE (target_signal_to_host (signo)); |
1663 | ||
1664 | if (debug_linux_nat) | |
1665 | fprintf_unfiltered (gdb_stdlog, | |
1666 | "GPT: lwp %s has pending signal %s\n", | |
1667 | target_pid_to_str (lp->ptid), | |
1668 | target_signal_to_string (signo)); | |
4c28f408 | 1669 | } |
a0ef4274 DJ |
1670 | |
1671 | return 0; | |
1672 | } | |
1673 | ||
d6b0e80f AC |
1674 | static int |
1675 | detach_callback (struct lwp_info *lp, void *data) | |
1676 | { | |
1677 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1678 | ||
1679 | if (debug_linux_nat && lp->status) | |
1680 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1681 | strsignal (WSTOPSIG (lp->status)), | |
1682 | target_pid_to_str (lp->ptid)); | |
1683 | ||
a0ef4274 DJ |
1684 | /* If there is a pending SIGSTOP, get rid of it. */ |
1685 | if (lp->signalled) | |
d6b0e80f | 1686 | { |
d6b0e80f AC |
1687 | if (debug_linux_nat) |
1688 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1689 | "DC: Sending SIGCONT to %s\n", |
1690 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1691 | |
a0ef4274 | 1692 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1693 | lp->signalled = 0; |
d6b0e80f AC |
1694 | } |
1695 | ||
1696 | /* We don't actually detach from the LWP that has an id equal to the | |
1697 | overall process id just yet. */ | |
1698 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1699 | { | |
a0ef4274 DJ |
1700 | int status = 0; |
1701 | ||
1702 | /* Pass on any pending signal for this LWP. */ | |
1703 | get_pending_status (lp, &status); | |
1704 | ||
d6b0e80f AC |
1705 | errno = 0; |
1706 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1707 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1708 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1709 | safe_strerror (errno)); |
1710 | ||
1711 | if (debug_linux_nat) | |
1712 | fprintf_unfiltered (gdb_stdlog, | |
1713 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1714 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1715 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1716 | |
1717 | delete_lwp (lp->ptid); | |
1718 | } | |
1719 | ||
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | static void | |
136d6dae | 1724 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1725 | { |
b84876c2 | 1726 | int pid; |
a0ef4274 | 1727 | int status; |
d90e17a7 PA |
1728 | struct lwp_info *main_lwp; |
1729 | ||
1730 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1731 | |
b84876c2 PA |
1732 | if (target_can_async_p ()) |
1733 | linux_nat_async (NULL, 0); | |
1734 | ||
4c28f408 PA |
1735 | /* Stop all threads before detaching. ptrace requires that the |
1736 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1737 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1738 | /* ... and wait until all of them have reported back that |
1739 | they're no longer running. */ | |
d90e17a7 | 1740 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1741 | |
d90e17a7 | 1742 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1743 | |
1744 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1745 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1746 | ||
1747 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1748 | |
a0ef4274 DJ |
1749 | /* Pass on any pending signal for the last LWP. */ |
1750 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1751 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1752 | && WIFSTOPPED (status)) |
1753 | { | |
1754 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1755 | pass it along with PTRACE_DETACH. */ | |
1756 | args = alloca (8); | |
1757 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
ddabfc73 TT |
1758 | if (debug_linux_nat) |
1759 | fprintf_unfiltered (gdb_stdlog, | |
1760 | "LND: Sending signal %s to %s\n", | |
1761 | args, | |
1762 | target_pid_to_str (main_lwp->ptid)); | |
a0ef4274 DJ |
1763 | } |
1764 | ||
d90e17a7 | 1765 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1766 | |
7a7d3353 PA |
1767 | if (forks_exist_p ()) |
1768 | { | |
1769 | /* Multi-fork case. The current inferior_ptid is being detached | |
1770 | from, but there are other viable forks to debug. Detach from | |
1771 | the current fork, and context-switch to the first | |
1772 | available. */ | |
1773 | linux_fork_detach (args, from_tty); | |
1774 | ||
1775 | if (non_stop && target_can_async_p ()) | |
1776 | target_async (inferior_event_handler, 0); | |
1777 | } | |
1778 | else | |
1779 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1780 | } |
1781 | ||
1782 | /* Resume LP. */ | |
1783 | ||
1784 | static int | |
1785 | resume_callback (struct lwp_info *lp, void *data) | |
1786 | { | |
6c95b8df PA |
1787 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
1788 | ||
1789 | if (lp->stopped && inf->vfork_child != NULL) | |
1790 | { | |
1791 | if (debug_linux_nat) | |
1792 | fprintf_unfiltered (gdb_stdlog, | |
1793 | "RC: Not resuming %s (vfork parent)\n", | |
1794 | target_pid_to_str (lp->ptid)); | |
1795 | } | |
1796 | else if (lp->stopped && lp->status == 0) | |
d6b0e80f | 1797 | { |
d90e17a7 PA |
1798 | if (debug_linux_nat) |
1799 | fprintf_unfiltered (gdb_stdlog, | |
a289b8f6 | 1800 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", |
d90e17a7 PA |
1801 | target_pid_to_str (lp->ptid)); |
1802 | ||
28439f5e PA |
1803 | linux_ops->to_resume (linux_ops, |
1804 | pid_to_ptid (GET_LWP (lp->ptid)), | |
a289b8f6 | 1805 | 0, TARGET_SIGNAL_0); |
d6b0e80f AC |
1806 | if (debug_linux_nat) |
1807 | fprintf_unfiltered (gdb_stdlog, | |
a289b8f6 | 1808 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", |
d6b0e80f AC |
1809 | target_pid_to_str (lp->ptid)); |
1810 | lp->stopped = 0; | |
a289b8f6 | 1811 | lp->step = 0; |
9f0bdab8 | 1812 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 1813 | lp->stopped_by_watchpoint = 0; |
d6b0e80f | 1814 | } |
57380f4e | 1815 | else if (lp->stopped && debug_linux_nat) |
3e43a32a MS |
1816 | fprintf_unfiltered (gdb_stdlog, |
1817 | "RC: Not resuming sibling %s (has pending)\n", | |
57380f4e DJ |
1818 | target_pid_to_str (lp->ptid)); |
1819 | else if (debug_linux_nat) | |
3e43a32a MS |
1820 | fprintf_unfiltered (gdb_stdlog, |
1821 | "RC: Not resuming sibling %s (not stopped)\n", | |
57380f4e | 1822 | target_pid_to_str (lp->ptid)); |
d6b0e80f AC |
1823 | |
1824 | return 0; | |
1825 | } | |
1826 | ||
1827 | static int | |
1828 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1829 | { | |
1830 | lp->resumed = 0; | |
1831 | return 0; | |
1832 | } | |
1833 | ||
1834 | static int | |
1835 | resume_set_callback (struct lwp_info *lp, void *data) | |
1836 | { | |
1837 | lp->resumed = 1; | |
1838 | return 0; | |
1839 | } | |
1840 | ||
1841 | static void | |
28439f5e PA |
1842 | linux_nat_resume (struct target_ops *ops, |
1843 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1844 | { |
7feb7d06 | 1845 | sigset_t prev_mask; |
d6b0e80f | 1846 | struct lwp_info *lp; |
d90e17a7 | 1847 | int resume_many; |
d6b0e80f | 1848 | |
76f50ad1 DJ |
1849 | if (debug_linux_nat) |
1850 | fprintf_unfiltered (gdb_stdlog, | |
1851 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1852 | step ? "step" : "resume", | |
1853 | target_pid_to_str (ptid), | |
423ec54c JK |
1854 | (signo != TARGET_SIGNAL_0 |
1855 | ? strsignal (target_signal_to_host (signo)) : "0"), | |
76f50ad1 DJ |
1856 | target_pid_to_str (inferior_ptid)); |
1857 | ||
7feb7d06 | 1858 | block_child_signals (&prev_mask); |
b84876c2 | 1859 | |
d6b0e80f | 1860 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1861 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1862 | || ptid_is_pid (ptid)); | |
4c28f408 | 1863 | |
e3e9f5a2 PA |
1864 | /* Mark the lwps we're resuming as resumed. */ |
1865 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
d6b0e80f | 1866 | |
d90e17a7 PA |
1867 | /* See if it's the current inferior that should be handled |
1868 | specially. */ | |
1869 | if (resume_many) | |
1870 | lp = find_lwp_pid (inferior_ptid); | |
1871 | else | |
1872 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1873 | gdb_assert (lp != NULL); |
d6b0e80f | 1874 | |
9f0bdab8 DJ |
1875 | /* Remember if we're stepping. */ |
1876 | lp->step = step; | |
d6b0e80f | 1877 | |
9f0bdab8 DJ |
1878 | /* If we have a pending wait status for this thread, there is no |
1879 | point in resuming the process. But first make sure that | |
1880 | linux_nat_wait won't preemptively handle the event - we | |
1881 | should never take this short-circuit if we are going to | |
1882 | leave LP running, since we have skipped resuming all the | |
1883 | other threads. This bit of code needs to be synchronized | |
1884 | with linux_nat_wait. */ | |
76f50ad1 | 1885 | |
9f0bdab8 DJ |
1886 | if (lp->status && WIFSTOPPED (lp->status)) |
1887 | { | |
423ec54c | 1888 | enum target_signal saved_signo; |
d6b48e9c | 1889 | struct inferior *inf; |
76f50ad1 | 1890 | |
d90e17a7 | 1891 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); |
d6b48e9c PA |
1892 | gdb_assert (inf); |
1893 | saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1894 | ||
1895 | /* Defer to common code if we're gaining control of the | |
1896 | inferior. */ | |
16c381f0 | 1897 | if (inf->control.stop_soon == NO_STOP_QUIETLY |
d6b48e9c | 1898 | && signal_stop_state (saved_signo) == 0 |
9f0bdab8 DJ |
1899 | && signal_print_state (saved_signo) == 0 |
1900 | && signal_pass_state (saved_signo) == 1) | |
d6b0e80f | 1901 | { |
9f0bdab8 DJ |
1902 | if (debug_linux_nat) |
1903 | fprintf_unfiltered (gdb_stdlog, | |
1904 | "LLR: Not short circuiting for ignored " | |
1905 | "status 0x%x\n", lp->status); | |
1906 | ||
d6b0e80f AC |
1907 | /* FIXME: What should we do if we are supposed to continue |
1908 | this thread with a signal? */ | |
1909 | gdb_assert (signo == TARGET_SIGNAL_0); | |
9f0bdab8 DJ |
1910 | signo = saved_signo; |
1911 | lp->status = 0; | |
1912 | } | |
1913 | } | |
76f50ad1 | 1914 | |
6c95b8df | 1915 | if (lp->status || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
9f0bdab8 DJ |
1916 | { |
1917 | /* FIXME: What should we do if we are supposed to continue | |
1918 | this thread with a signal? */ | |
1919 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1920 | |
9f0bdab8 DJ |
1921 | if (debug_linux_nat) |
1922 | fprintf_unfiltered (gdb_stdlog, | |
1923 | "LLR: Short circuiting for status 0x%x\n", | |
1924 | lp->status); | |
d6b0e80f | 1925 | |
7feb7d06 PA |
1926 | restore_child_signals_mask (&prev_mask); |
1927 | if (target_can_async_p ()) | |
1928 | { | |
1929 | target_async (inferior_event_handler, 0); | |
1930 | /* Tell the event loop we have something to process. */ | |
1931 | async_file_mark (); | |
1932 | } | |
9f0bdab8 | 1933 | return; |
d6b0e80f AC |
1934 | } |
1935 | ||
9f0bdab8 DJ |
1936 | /* Mark LWP as not stopped to prevent it from being continued by |
1937 | resume_callback. */ | |
1938 | lp->stopped = 0; | |
1939 | ||
d90e17a7 PA |
1940 | if (resume_many) |
1941 | iterate_over_lwps (ptid, resume_callback, NULL); | |
1942 | ||
1943 | /* Convert to something the lower layer understands. */ | |
1944 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 1945 | |
28439f5e | 1946 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 | 1947 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 1948 | lp->stopped_by_watchpoint = 0; |
9f0bdab8 | 1949 | |
d6b0e80f AC |
1950 | if (debug_linux_nat) |
1951 | fprintf_unfiltered (gdb_stdlog, | |
1952 | "LLR: %s %s, %s (resume event thread)\n", | |
1953 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1954 | target_pid_to_str (ptid), | |
423ec54c JK |
1955 | (signo != TARGET_SIGNAL_0 |
1956 | ? strsignal (target_signal_to_host (signo)) : "0")); | |
b84876c2 | 1957 | |
7feb7d06 | 1958 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 1959 | if (target_can_async_p ()) |
8ea051c5 | 1960 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1961 | } |
1962 | ||
c5f62d5f | 1963 | /* Send a signal to an LWP. */ |
d6b0e80f AC |
1964 | |
1965 | static int | |
1966 | kill_lwp (int lwpid, int signo) | |
1967 | { | |
c5f62d5f DE |
1968 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1969 | fails, then we are not using nptl threads and we should be using kill. */ | |
d6b0e80f AC |
1970 | |
1971 | #ifdef HAVE_TKILL_SYSCALL | |
c5f62d5f DE |
1972 | { |
1973 | static int tkill_failed; | |
1974 | ||
1975 | if (!tkill_failed) | |
1976 | { | |
1977 | int ret; | |
1978 | ||
1979 | errno = 0; | |
1980 | ret = syscall (__NR_tkill, lwpid, signo); | |
1981 | if (errno != ENOSYS) | |
1982 | return ret; | |
1983 | tkill_failed = 1; | |
1984 | } | |
1985 | } | |
d6b0e80f AC |
1986 | #endif |
1987 | ||
1988 | return kill (lwpid, signo); | |
1989 | } | |
1990 | ||
ca2163eb PA |
1991 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
1992 | event, check if the core is interested in it: if not, ignore the | |
1993 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
1994 | syscall entry/exit status, since the ptrace event itself doesn't | |
1995 | indicate it, and report the trap to higher layers. */ | |
1996 | ||
1997 | static int | |
1998 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
1999 | { | |
2000 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2001 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
2002 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2003 | ||
2004 | if (stopping) | |
2005 | { | |
2006 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
2007 | makes it so that the LWP reports an immediate syscall return, | |
2008 | followed by the SIGSTOP. Skip seeing that "return" using | |
2009 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
2010 | SIGSTOP. Later when the thread is resumed, a new syscall | |
2011 | entry event. If we didn't do this (and returned 0), we'd | |
2012 | leave a syscall entry pending, and our caller, by using | |
2013 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
2014 | itself. Later, when the user re-resumes this LWP, we'd see | |
2015 | another syscall entry event and we'd mistake it for a return. | |
2016 | ||
2017 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
2018 | (leaving immediately with LWP->signalled set, without issuing | |
2019 | a PTRACE_CONT), it would still be problematic to leave this | |
2020 | syscall enter pending, as later when the thread is resumed, | |
2021 | it would then see the same syscall exit mentioned above, | |
2022 | followed by the delayed SIGSTOP, while the syscall didn't | |
2023 | actually get to execute. It seems it would be even more | |
2024 | confusing to the user. */ | |
2025 | ||
2026 | if (debug_linux_nat) | |
2027 | fprintf_unfiltered (gdb_stdlog, | |
2028 | "LHST: ignoring syscall %d " | |
2029 | "for LWP %ld (stopping threads), " | |
2030 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
2031 | syscall_number, | |
2032 | GET_LWP (lp->ptid)); | |
2033 | ||
2034 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2035 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2036 | return 1; | |
2037 | } | |
2038 | ||
2039 | if (catch_syscall_enabled ()) | |
2040 | { | |
2041 | /* Always update the entry/return state, even if this particular | |
2042 | syscall isn't interesting to the core now. In async mode, | |
2043 | the user could install a new catchpoint for this syscall | |
2044 | between syscall enter/return, and we'll need to know to | |
2045 | report a syscall return if that happens. */ | |
2046 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2047 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2048 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2049 | ||
2050 | if (catching_syscall_number (syscall_number)) | |
2051 | { | |
2052 | /* Alright, an event to report. */ | |
2053 | ourstatus->kind = lp->syscall_state; | |
2054 | ourstatus->value.syscall_number = syscall_number; | |
2055 | ||
2056 | if (debug_linux_nat) | |
2057 | fprintf_unfiltered (gdb_stdlog, | |
2058 | "LHST: stopping for %s of syscall %d" | |
2059 | " for LWP %ld\n", | |
3e43a32a MS |
2060 | lp->syscall_state |
2061 | == TARGET_WAITKIND_SYSCALL_ENTRY | |
ca2163eb PA |
2062 | ? "entry" : "return", |
2063 | syscall_number, | |
2064 | GET_LWP (lp->ptid)); | |
2065 | return 0; | |
2066 | } | |
2067 | ||
2068 | if (debug_linux_nat) | |
2069 | fprintf_unfiltered (gdb_stdlog, | |
2070 | "LHST: ignoring %s of syscall %d " | |
2071 | "for LWP %ld\n", | |
2072 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2073 | ? "entry" : "return", | |
2074 | syscall_number, | |
2075 | GET_LWP (lp->ptid)); | |
2076 | } | |
2077 | else | |
2078 | { | |
2079 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
2080 | before on this LWP, it could happen that the user removes all | |
2081 | syscall catchpoints before we get to process this event. | |
2082 | There are two noteworthy issues here: | |
2083 | ||
2084 | - When stopped at a syscall entry event, resuming with | |
2085 | PT_STEP still resumes executing the syscall and reports a | |
2086 | syscall return. | |
2087 | ||
2088 | - Only PT_SYSCALL catches syscall enters. If we last | |
2089 | single-stepped this thread, then this event can't be a | |
2090 | syscall enter. If we last single-stepped this thread, this | |
2091 | has to be a syscall exit. | |
2092 | ||
2093 | The points above mean that the next resume, be it PT_STEP or | |
2094 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
2095 | if (debug_linux_nat) | |
2096 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2097 | "LHST: caught syscall event " |
2098 | "with no syscall catchpoints." | |
ca2163eb PA |
2099 | " %d for LWP %ld, ignoring\n", |
2100 | syscall_number, | |
2101 | GET_LWP (lp->ptid)); | |
2102 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2103 | } | |
2104 | ||
2105 | /* The core isn't interested in this event. For efficiency, avoid | |
2106 | stopping all threads only to have the core resume them all again. | |
2107 | Since we're not stopping threads, if we're still syscall tracing | |
2108 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
2109 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
2110 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
2111 | ||
2112 | /* Note that gdbarch_get_syscall_number may access registers, hence | |
2113 | fill a regcache. */ | |
2114 | registers_changed (); | |
2115 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
2116 | lp->step, TARGET_SIGNAL_0); | |
2117 | return 1; | |
2118 | } | |
2119 | ||
3d799a95 DJ |
2120 | /* Handle a GNU/Linux extended wait response. If we see a clone |
2121 | event, we need to add the new LWP to our list (and not report the | |
2122 | trap to higher layers). This function returns non-zero if the | |
2123 | event should be ignored and we should wait again. If STOPPING is | |
2124 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
2125 | |
2126 | static int | |
3d799a95 DJ |
2127 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
2128 | int stopping) | |
d6b0e80f | 2129 | { |
3d799a95 DJ |
2130 | int pid = GET_LWP (lp->ptid); |
2131 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
3d799a95 | 2132 | int event = status >> 16; |
d6b0e80f | 2133 | |
3d799a95 DJ |
2134 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
2135 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 2136 | { |
3d799a95 DJ |
2137 | unsigned long new_pid; |
2138 | int ret; | |
2139 | ||
2140 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 2141 | |
3d799a95 DJ |
2142 | /* If we haven't already seen the new PID stop, wait for it now. */ |
2143 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
2144 | { | |
2145 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
2146 | hits the SIGSTOP, but we're already attached. */ | |
2147 | ret = my_waitpid (new_pid, &status, | |
2148 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
2149 | if (ret == -1) | |
2150 | perror_with_name (_("waiting for new child")); | |
2151 | else if (ret != new_pid) | |
2152 | internal_error (__FILE__, __LINE__, | |
2153 | _("wait returned unexpected PID %d"), ret); | |
2154 | else if (!WIFSTOPPED (status)) | |
2155 | internal_error (__FILE__, __LINE__, | |
2156 | _("wait returned unexpected status 0x%x"), status); | |
2157 | } | |
2158 | ||
3a3e9ee3 | 2159 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2160 | |
2277426b PA |
2161 | if (event == PTRACE_EVENT_FORK |
2162 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
2163 | { | |
2277426b PA |
2164 | /* Handle checkpointing by linux-fork.c here as a special |
2165 | case. We don't want the follow-fork-mode or 'catch fork' | |
2166 | to interfere with this. */ | |
2167 | ||
2168 | /* This won't actually modify the breakpoint list, but will | |
2169 | physically remove the breakpoints from the child. */ | |
2170 | detach_breakpoints (new_pid); | |
2171 | ||
2172 | /* Retain child fork in ptrace (stopped) state. */ | |
14571dad MS |
2173 | if (!find_fork_pid (new_pid)) |
2174 | add_fork (new_pid); | |
2277426b PA |
2175 | |
2176 | /* Report as spurious, so that infrun doesn't want to follow | |
2177 | this fork. We're actually doing an infcall in | |
2178 | linux-fork.c. */ | |
2179 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2180 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
2181 | ||
2182 | /* Report the stop to the core. */ | |
2183 | return 0; | |
2184 | } | |
2185 | ||
3d799a95 DJ |
2186 | if (event == PTRACE_EVENT_FORK) |
2187 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2188 | else if (event == PTRACE_EVENT_VFORK) | |
2189 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 2190 | else |
3d799a95 | 2191 | { |
78768c4a JK |
2192 | struct lwp_info *new_lp; |
2193 | ||
3d799a95 | 2194 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
78768c4a | 2195 | |
d90e17a7 | 2196 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 2197 | new_lp->cloned = 1; |
4c28f408 | 2198 | new_lp->stopped = 1; |
d6b0e80f | 2199 | |
3d799a95 DJ |
2200 | if (WSTOPSIG (status) != SIGSTOP) |
2201 | { | |
2202 | /* This can happen if someone starts sending signals to | |
2203 | the new thread before it gets a chance to run, which | |
2204 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2205 | This is an unlikely case, and harder to handle for | |
2206 | fork / vfork than for clone, so we do not try - but | |
2207 | we handle it for clone events here. We'll send | |
2208 | the other signal on to the thread below. */ | |
2209 | ||
2210 | new_lp->signalled = 1; | |
2211 | } | |
2212 | else | |
2213 | status = 0; | |
d6b0e80f | 2214 | |
4c28f408 | 2215 | if (non_stop) |
3d799a95 | 2216 | { |
4c28f408 PA |
2217 | /* Add the new thread to GDB's lists as soon as possible |
2218 | so that: | |
2219 | ||
2220 | 1) the frontend doesn't have to wait for a stop to | |
2221 | display them, and, | |
2222 | ||
2223 | 2) we tag it with the correct running state. */ | |
2224 | ||
2225 | /* If the thread_db layer is active, let it know about | |
2226 | this new thread, and add it to GDB's list. */ | |
2227 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2228 | { | |
2229 | /* We're not using thread_db. Add it to GDB's | |
2230 | list. */ | |
2231 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2232 | add_thread (new_lp->ptid); | |
2233 | } | |
2234 | ||
2235 | if (!stopping) | |
2236 | { | |
2237 | set_running (new_lp->ptid, 1); | |
2238 | set_executing (new_lp->ptid, 1); | |
2239 | } | |
2240 | } | |
2241 | ||
ca2163eb PA |
2242 | /* Note the need to use the low target ops to resume, to |
2243 | handle resuming with PT_SYSCALL if we have syscall | |
2244 | catchpoints. */ | |
4c28f408 PA |
2245 | if (!stopping) |
2246 | { | |
423ec54c | 2247 | enum target_signal signo; |
ca2163eb | 2248 | |
4c28f408 | 2249 | new_lp->stopped = 0; |
3d799a95 | 2250 | new_lp->resumed = 1; |
ca2163eb PA |
2251 | |
2252 | signo = (status | |
2253 | ? target_signal_from_host (WSTOPSIG (status)) | |
2254 | : TARGET_SIGNAL_0); | |
2255 | ||
2256 | linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid), | |
2257 | 0, signo); | |
3d799a95 | 2258 | } |
ad34eb2f JK |
2259 | else |
2260 | { | |
2261 | if (status != 0) | |
2262 | { | |
2263 | /* We created NEW_LP so it cannot yet contain STATUS. */ | |
2264 | gdb_assert (new_lp->status == 0); | |
2265 | ||
2266 | /* Save the wait status to report later. */ | |
2267 | if (debug_linux_nat) | |
2268 | fprintf_unfiltered (gdb_stdlog, | |
2269 | "LHEW: waitpid of new LWP %ld, " | |
2270 | "saving status %s\n", | |
2271 | (long) GET_LWP (new_lp->ptid), | |
2272 | status_to_str (status)); | |
2273 | new_lp->status = status; | |
2274 | } | |
2275 | } | |
d6b0e80f | 2276 | |
3d799a95 DJ |
2277 | if (debug_linux_nat) |
2278 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2279 | "LHEW: Got clone event " |
2280 | "from LWP %ld, resuming\n", | |
3d799a95 | 2281 | GET_LWP (lp->ptid)); |
ca2163eb PA |
2282 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
2283 | 0, TARGET_SIGNAL_0); | |
3d799a95 DJ |
2284 | |
2285 | return 1; | |
2286 | } | |
2287 | ||
2288 | return 0; | |
d6b0e80f AC |
2289 | } |
2290 | ||
3d799a95 DJ |
2291 | if (event == PTRACE_EVENT_EXEC) |
2292 | { | |
a75724bc PA |
2293 | if (debug_linux_nat) |
2294 | fprintf_unfiltered (gdb_stdlog, | |
2295 | "LHEW: Got exec event from LWP %ld\n", | |
2296 | GET_LWP (lp->ptid)); | |
2297 | ||
3d799a95 DJ |
2298 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2299 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2300 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 | 2301 | |
6c95b8df PA |
2302 | return 0; |
2303 | } | |
2304 | ||
2305 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2306 | { | |
2307 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2308 | { |
6c95b8df | 2309 | if (debug_linux_nat) |
3e43a32a MS |
2310 | fprintf_unfiltered (gdb_stdlog, |
2311 | "LHEW: Got expected PTRACE_EVENT_" | |
2312 | "VFORK_DONE from LWP %ld: stopping\n", | |
6c95b8df | 2313 | GET_LWP (lp->ptid)); |
3d799a95 | 2314 | |
6c95b8df PA |
2315 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2316 | return 0; | |
3d799a95 DJ |
2317 | } |
2318 | ||
6c95b8df | 2319 | if (debug_linux_nat) |
3e43a32a MS |
2320 | fprintf_unfiltered (gdb_stdlog, |
2321 | "LHEW: Got PTRACE_EVENT_VFORK_DONE " | |
2322 | "from LWP %ld: resuming\n", | |
6c95b8df PA |
2323 | GET_LWP (lp->ptid)); |
2324 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2325 | return 1; | |
3d799a95 DJ |
2326 | } |
2327 | ||
2328 | internal_error (__FILE__, __LINE__, | |
2329 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2330 | } |
2331 | ||
2332 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
2333 | exited. */ | |
2334 | ||
2335 | static int | |
2336 | wait_lwp (struct lwp_info *lp) | |
2337 | { | |
2338 | pid_t pid; | |
2339 | int status; | |
2340 | int thread_dead = 0; | |
2341 | ||
2342 | gdb_assert (!lp->stopped); | |
2343 | gdb_assert (lp->status == 0); | |
2344 | ||
58aecb61 | 2345 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
2346 | if (pid == -1 && errno == ECHILD) |
2347 | { | |
58aecb61 | 2348 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
2349 | if (pid == -1 && errno == ECHILD) |
2350 | { | |
2351 | /* The thread has previously exited. We need to delete it | |
2352 | now because, for some vendor 2.4 kernels with NPTL | |
2353 | support backported, there won't be an exit event unless | |
2354 | it is the main thread. 2.6 kernels will report an exit | |
2355 | event for each thread that exits, as expected. */ | |
2356 | thread_dead = 1; | |
2357 | if (debug_linux_nat) | |
2358 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2359 | target_pid_to_str (lp->ptid)); | |
2360 | } | |
2361 | } | |
2362 | ||
2363 | if (!thread_dead) | |
2364 | { | |
2365 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2366 | ||
2367 | if (debug_linux_nat) | |
2368 | { | |
2369 | fprintf_unfiltered (gdb_stdlog, | |
2370 | "WL: waitpid %s received %s\n", | |
2371 | target_pid_to_str (lp->ptid), | |
2372 | status_to_str (status)); | |
2373 | } | |
2374 | } | |
2375 | ||
2376 | /* Check if the thread has exited. */ | |
2377 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2378 | { | |
2379 | thread_dead = 1; | |
2380 | if (debug_linux_nat) | |
2381 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2382 | target_pid_to_str (lp->ptid)); | |
2383 | } | |
2384 | ||
2385 | if (thread_dead) | |
2386 | { | |
e26af52f | 2387 | exit_lwp (lp); |
d6b0e80f AC |
2388 | return 0; |
2389 | } | |
2390 | ||
2391 | gdb_assert (WIFSTOPPED (status)); | |
2392 | ||
ca2163eb PA |
2393 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2394 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2395 | { | |
2396 | /* No longer need the sysgood bit. The ptrace event ends up | |
2397 | recorded in lp->waitstatus if we care for it. We can carry | |
2398 | on handling the event like a regular SIGTRAP from here | |
2399 | on. */ | |
2400 | status = W_STOPCODE (SIGTRAP); | |
2401 | if (linux_handle_syscall_trap (lp, 1)) | |
2402 | return wait_lwp (lp); | |
2403 | } | |
2404 | ||
d6b0e80f AC |
2405 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
2406 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2407 | { | |
2408 | if (debug_linux_nat) | |
2409 | fprintf_unfiltered (gdb_stdlog, | |
2410 | "WL: Handling extended status 0x%06x\n", | |
2411 | status); | |
3d799a95 | 2412 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2413 | return wait_lwp (lp); |
2414 | } | |
2415 | ||
2416 | return status; | |
2417 | } | |
2418 | ||
9f0bdab8 DJ |
2419 | /* Save the most recent siginfo for LP. This is currently only called |
2420 | for SIGTRAP; some ports use the si_addr field for | |
2421 | target_stopped_data_address. In the future, it may also be used to | |
2422 | restore the siginfo of requeued signals. */ | |
2423 | ||
2424 | static void | |
2425 | save_siginfo (struct lwp_info *lp) | |
2426 | { | |
2427 | errno = 0; | |
2428 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2429 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2430 | ||
2431 | if (errno != 0) | |
2432 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2433 | } | |
2434 | ||
d6b0e80f AC |
2435 | /* Send a SIGSTOP to LP. */ |
2436 | ||
2437 | static int | |
2438 | stop_callback (struct lwp_info *lp, void *data) | |
2439 | { | |
2440 | if (!lp->stopped && !lp->signalled) | |
2441 | { | |
2442 | int ret; | |
2443 | ||
2444 | if (debug_linux_nat) | |
2445 | { | |
2446 | fprintf_unfiltered (gdb_stdlog, | |
2447 | "SC: kill %s **<SIGSTOP>**\n", | |
2448 | target_pid_to_str (lp->ptid)); | |
2449 | } | |
2450 | errno = 0; | |
2451 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2452 | if (debug_linux_nat) | |
2453 | { | |
2454 | fprintf_unfiltered (gdb_stdlog, | |
2455 | "SC: lwp kill %d %s\n", | |
2456 | ret, | |
2457 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2458 | } | |
2459 | ||
2460 | lp->signalled = 1; | |
2461 | gdb_assert (lp->status == 0); | |
2462 | } | |
2463 | ||
2464 | return 0; | |
2465 | } | |
2466 | ||
57380f4e | 2467 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2468 | |
2469 | static int | |
57380f4e DJ |
2470 | linux_nat_has_pending_sigint (int pid) |
2471 | { | |
2472 | sigset_t pending, blocked, ignored; | |
57380f4e DJ |
2473 | |
2474 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2475 | ||
2476 | if (sigismember (&pending, SIGINT) | |
2477 | && !sigismember (&ignored, SIGINT)) | |
2478 | return 1; | |
2479 | ||
2480 | return 0; | |
2481 | } | |
2482 | ||
2483 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2484 | ||
2485 | static int | |
2486 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2487 | { |
57380f4e DJ |
2488 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2489 | flag to consume the next one. */ | |
2490 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2491 | && WSTOPSIG (lp->status) == SIGINT) | |
2492 | lp->status = 0; | |
2493 | else | |
2494 | lp->ignore_sigint = 1; | |
2495 | ||
2496 | return 0; | |
2497 | } | |
2498 | ||
2499 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2500 | This function is called after we know the LWP has stopped; if the LWP | |
2501 | stopped before the expected SIGINT was delivered, then it will never have | |
2502 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2503 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2504 | |
57380f4e DJ |
2505 | static void |
2506 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2507 | { | |
2508 | if (!lp->ignore_sigint) | |
2509 | return; | |
2510 | ||
2511 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2512 | { | |
2513 | if (debug_linux_nat) | |
2514 | fprintf_unfiltered (gdb_stdlog, | |
2515 | "MCIS: Clearing bogus flag for %s\n", | |
2516 | target_pid_to_str (lp->ptid)); | |
2517 | lp->ignore_sigint = 0; | |
2518 | } | |
2519 | } | |
2520 | ||
ebec9a0f PA |
2521 | /* Fetch the possible triggered data watchpoint info and store it in |
2522 | LP. | |
2523 | ||
2524 | On some archs, like x86, that use debug registers to set | |
2525 | watchpoints, it's possible that the way to know which watched | |
2526 | address trapped, is to check the register that is used to select | |
2527 | which address to watch. Problem is, between setting the watchpoint | |
2528 | and reading back which data address trapped, the user may change | |
2529 | the set of watchpoints, and, as a consequence, GDB changes the | |
2530 | debug registers in the inferior. To avoid reading back a stale | |
2531 | stopped-data-address when that happens, we cache in LP the fact | |
2532 | that a watchpoint trapped, and the corresponding data address, as | |
2533 | soon as we see LP stop with a SIGTRAP. If GDB changes the debug | |
2534 | registers meanwhile, we have the cached data we can rely on. */ | |
2535 | ||
2536 | static void | |
2537 | save_sigtrap (struct lwp_info *lp) | |
2538 | { | |
2539 | struct cleanup *old_chain; | |
2540 | ||
2541 | if (linux_ops->to_stopped_by_watchpoint == NULL) | |
2542 | { | |
2543 | lp->stopped_by_watchpoint = 0; | |
2544 | return; | |
2545 | } | |
2546 | ||
2547 | old_chain = save_inferior_ptid (); | |
2548 | inferior_ptid = lp->ptid; | |
2549 | ||
2550 | lp->stopped_by_watchpoint = linux_ops->to_stopped_by_watchpoint (); | |
2551 | ||
2552 | if (lp->stopped_by_watchpoint) | |
2553 | { | |
2554 | if (linux_ops->to_stopped_data_address != NULL) | |
2555 | lp->stopped_data_address_p = | |
2556 | linux_ops->to_stopped_data_address (¤t_target, | |
2557 | &lp->stopped_data_address); | |
2558 | else | |
2559 | lp->stopped_data_address_p = 0; | |
2560 | } | |
2561 | ||
2562 | do_cleanups (old_chain); | |
2563 | } | |
2564 | ||
2565 | /* See save_sigtrap. */ | |
2566 | ||
2567 | static int | |
2568 | linux_nat_stopped_by_watchpoint (void) | |
2569 | { | |
2570 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2571 | ||
2572 | gdb_assert (lp != NULL); | |
2573 | ||
2574 | return lp->stopped_by_watchpoint; | |
2575 | } | |
2576 | ||
2577 | static int | |
2578 | linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) | |
2579 | { | |
2580 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2581 | ||
2582 | gdb_assert (lp != NULL); | |
2583 | ||
2584 | *addr_p = lp->stopped_data_address; | |
2585 | ||
2586 | return lp->stopped_data_address_p; | |
2587 | } | |
2588 | ||
26ab7092 JK |
2589 | /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */ |
2590 | ||
2591 | static int | |
2592 | sigtrap_is_event (int status) | |
2593 | { | |
2594 | return WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP; | |
2595 | } | |
2596 | ||
2597 | /* SIGTRAP-like events recognizer. */ | |
2598 | ||
2599 | static int (*linux_nat_status_is_event) (int status) = sigtrap_is_event; | |
2600 | ||
00390b84 JK |
2601 | /* Check for SIGTRAP-like events in LP. */ |
2602 | ||
2603 | static int | |
2604 | linux_nat_lp_status_is_event (struct lwp_info *lp) | |
2605 | { | |
2606 | /* We check for lp->waitstatus in addition to lp->status, because we can | |
2607 | have pending process exits recorded in lp->status | |
2608 | and W_EXITCODE(0,0) == 0. We should probably have an additional | |
2609 | lp->status_p flag. */ | |
2610 | ||
2611 | return (lp->waitstatus.kind == TARGET_WAITKIND_IGNORE | |
2612 | && linux_nat_status_is_event (lp->status)); | |
2613 | } | |
2614 | ||
26ab7092 JK |
2615 | /* Set alternative SIGTRAP-like events recognizer. If |
2616 | breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be | |
2617 | applied. */ | |
2618 | ||
2619 | void | |
2620 | linux_nat_set_status_is_event (struct target_ops *t, | |
2621 | int (*status_is_event) (int status)) | |
2622 | { | |
2623 | linux_nat_status_is_event = status_is_event; | |
2624 | } | |
2625 | ||
57380f4e DJ |
2626 | /* Wait until LP is stopped. */ |
2627 | ||
2628 | static int | |
2629 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2630 | { | |
6c95b8df PA |
2631 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
2632 | ||
2633 | /* If this is a vfork parent, bail out, it is not going to report | |
2634 | any SIGSTOP until the vfork is done with. */ | |
2635 | if (inf->vfork_child != NULL) | |
2636 | return 0; | |
2637 | ||
d6b0e80f AC |
2638 | if (!lp->stopped) |
2639 | { | |
2640 | int status; | |
2641 | ||
2642 | status = wait_lwp (lp); | |
2643 | if (status == 0) | |
2644 | return 0; | |
2645 | ||
57380f4e DJ |
2646 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2647 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2648 | { |
57380f4e | 2649 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2650 | |
2651 | errno = 0; | |
2652 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2653 | if (debug_linux_nat) | |
2654 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2655 | "PTRACE_CONT %s, 0, 0 (%s) " |
2656 | "(discarding SIGINT)\n", | |
d6b0e80f AC |
2657 | target_pid_to_str (lp->ptid), |
2658 | errno ? safe_strerror (errno) : "OK"); | |
2659 | ||
57380f4e | 2660 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2661 | } |
2662 | ||
57380f4e DJ |
2663 | maybe_clear_ignore_sigint (lp); |
2664 | ||
d6b0e80f AC |
2665 | if (WSTOPSIG (status) != SIGSTOP) |
2666 | { | |
26ab7092 | 2667 | if (linux_nat_status_is_event (status)) |
d6b0e80f AC |
2668 | { |
2669 | /* If a LWP other than the LWP that we're reporting an | |
2670 | event for has hit a GDB breakpoint (as opposed to | |
2671 | some random trap signal), then just arrange for it to | |
2672 | hit it again later. We don't keep the SIGTRAP status | |
2673 | and don't forward the SIGTRAP signal to the LWP. We | |
2674 | will handle the current event, eventually we will | |
2675 | resume all LWPs, and this one will get its breakpoint | |
2676 | trap again. | |
2677 | ||
2678 | If we do not do this, then we run the risk that the | |
2679 | user will delete or disable the breakpoint, but the | |
2680 | thread will have already tripped on it. */ | |
2681 | ||
9f0bdab8 DJ |
2682 | /* Save the trap's siginfo in case we need it later. */ |
2683 | save_siginfo (lp); | |
2684 | ||
ebec9a0f PA |
2685 | save_sigtrap (lp); |
2686 | ||
1777feb0 | 2687 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2688 | errno = 0; |
2689 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2690 | if (debug_linux_nat) | |
2691 | { | |
2692 | fprintf_unfiltered (gdb_stdlog, | |
2693 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2694 | target_pid_to_str (lp->ptid), | |
2695 | errno ? safe_strerror (errno) : "OK"); | |
2696 | ||
2697 | fprintf_unfiltered (gdb_stdlog, | |
2698 | "SWC: Candidate SIGTRAP event in %s\n", | |
2699 | target_pid_to_str (lp->ptid)); | |
2700 | } | |
710151dd | 2701 | /* Hold this event/waitstatus while we check to see if |
1777feb0 | 2702 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2703 | stop_wait_callback (lp, NULL); |
710151dd | 2704 | |
7feb7d06 PA |
2705 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2706 | there's another event, throw it back into the | |
1777feb0 | 2707 | queue. */ |
7feb7d06 | 2708 | if (lp->status) |
710151dd | 2709 | { |
7feb7d06 PA |
2710 | if (debug_linux_nat) |
2711 | fprintf_unfiltered (gdb_stdlog, | |
2712 | "SWC: kill %s, %s\n", | |
2713 | target_pid_to_str (lp->ptid), | |
2714 | status_to_str ((int) status)); | |
2715 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2716 | } |
7feb7d06 | 2717 | |
1777feb0 | 2718 | /* Save the sigtrap event. */ |
7feb7d06 | 2719 | lp->status = status; |
d6b0e80f AC |
2720 | return 0; |
2721 | } | |
2722 | else | |
2723 | { | |
2724 | /* The thread was stopped with a signal other than | |
1777feb0 | 2725 | SIGSTOP, and didn't accidentally trip a breakpoint. */ |
d6b0e80f AC |
2726 | |
2727 | if (debug_linux_nat) | |
2728 | { | |
2729 | fprintf_unfiltered (gdb_stdlog, | |
2730 | "SWC: Pending event %s in %s\n", | |
2731 | status_to_str ((int) status), | |
2732 | target_pid_to_str (lp->ptid)); | |
2733 | } | |
1777feb0 | 2734 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2735 | errno = 0; |
2736 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2737 | if (debug_linux_nat) | |
2738 | fprintf_unfiltered (gdb_stdlog, | |
2739 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2740 | target_pid_to_str (lp->ptid), | |
2741 | errno ? safe_strerror (errno) : "OK"); | |
2742 | ||
2743 | /* Hold this event/waitstatus while we check to see if | |
1777feb0 | 2744 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2745 | stop_wait_callback (lp, NULL); |
710151dd PA |
2746 | |
2747 | /* If the lp->status field is still empty, use it to | |
2748 | hold this event. If not, then this event must be | |
2749 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2750 | if (lp->status) |
d6b0e80f AC |
2751 | { |
2752 | if (debug_linux_nat) | |
2753 | { | |
2754 | fprintf_unfiltered (gdb_stdlog, | |
2755 | "SWC: kill %s, %s\n", | |
2756 | target_pid_to_str (lp->ptid), | |
2757 | status_to_str ((int) status)); | |
2758 | } | |
2759 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2760 | } | |
710151dd PA |
2761 | else |
2762 | lp->status = status; | |
d6b0e80f AC |
2763 | return 0; |
2764 | } | |
2765 | } | |
2766 | else | |
2767 | { | |
2768 | /* We caught the SIGSTOP that we intended to catch, so | |
2769 | there's no SIGSTOP pending. */ | |
2770 | lp->stopped = 1; | |
2771 | lp->signalled = 0; | |
2772 | } | |
2773 | } | |
2774 | ||
2775 | return 0; | |
2776 | } | |
2777 | ||
d6b0e80f AC |
2778 | /* Return non-zero if LP has a wait status pending. */ |
2779 | ||
2780 | static int | |
2781 | status_callback (struct lwp_info *lp, void *data) | |
2782 | { | |
2783 | /* Only report a pending wait status if we pretend that this has | |
2784 | indeed been resumed. */ | |
ca2163eb PA |
2785 | if (!lp->resumed) |
2786 | return 0; | |
2787 | ||
2788 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2789 | { | |
2790 | /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event, | |
766062f6 | 2791 | or a pending process exit. Note that `W_EXITCODE(0,0) == |
ca2163eb PA |
2792 | 0', so a clean process exit can not be stored pending in |
2793 | lp->status, it is indistinguishable from | |
2794 | no-pending-status. */ | |
2795 | return 1; | |
2796 | } | |
2797 | ||
2798 | if (lp->status != 0) | |
2799 | return 1; | |
2800 | ||
2801 | return 0; | |
d6b0e80f AC |
2802 | } |
2803 | ||
2804 | /* Return non-zero if LP isn't stopped. */ | |
2805 | ||
2806 | static int | |
2807 | running_callback (struct lwp_info *lp, void *data) | |
2808 | { | |
2809 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2810 | } | |
2811 | ||
2812 | /* Count the LWP's that have had events. */ | |
2813 | ||
2814 | static int | |
2815 | count_events_callback (struct lwp_info *lp, void *data) | |
2816 | { | |
2817 | int *count = data; | |
2818 | ||
2819 | gdb_assert (count != NULL); | |
2820 | ||
e09490f1 | 2821 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2822 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2823 | (*count)++; |
2824 | ||
2825 | return 0; | |
2826 | } | |
2827 | ||
2828 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2829 | ||
2830 | static int | |
2831 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2832 | { | |
2833 | if (lp->step && lp->status != 0) | |
2834 | return 1; | |
2835 | else | |
2836 | return 0; | |
2837 | } | |
2838 | ||
2839 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2840 | ||
2841 | static int | |
2842 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2843 | { | |
2844 | int *selector = data; | |
2845 | ||
2846 | gdb_assert (selector != NULL); | |
2847 | ||
1777feb0 | 2848 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2849 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2850 | if ((*selector)-- == 0) |
2851 | return 1; | |
2852 | ||
2853 | return 0; | |
2854 | } | |
2855 | ||
710151dd PA |
2856 | static int |
2857 | cancel_breakpoint (struct lwp_info *lp) | |
2858 | { | |
2859 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2860 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2861 | LWP. We will handle the current event, eventually we will resume | |
2862 | this LWP, and this breakpoint will trap again. | |
2863 | ||
2864 | If we do not do this, then we run the risk that the user will | |
2865 | delete or disable the breakpoint, but the LWP will have already | |
2866 | tripped on it. */ | |
2867 | ||
515630c5 UW |
2868 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2869 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2870 | CORE_ADDR pc; | |
2871 | ||
2872 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
6c95b8df | 2873 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
710151dd PA |
2874 | { |
2875 | if (debug_linux_nat) | |
2876 | fprintf_unfiltered (gdb_stdlog, | |
2877 | "CB: Push back breakpoint for %s\n", | |
2878 | target_pid_to_str (lp->ptid)); | |
2879 | ||
2880 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2881 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2882 | regcache_write_pc (regcache, pc); | |
2883 | ||
710151dd PA |
2884 | return 1; |
2885 | } | |
2886 | return 0; | |
2887 | } | |
2888 | ||
d6b0e80f AC |
2889 | static int |
2890 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2891 | { | |
2892 | struct lwp_info *event_lp = data; | |
2893 | ||
2894 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2895 | if (lp == event_lp) | |
2896 | return 0; | |
2897 | ||
2898 | /* If a LWP other than the LWP that we're reporting an event for has | |
2899 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2900 | then just arrange for it to hit it again later. We don't keep | |
2901 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2902 | LWP. We will handle the current event, eventually we will resume | |
2903 | all LWPs, and this one will get its breakpoint trap again. | |
2904 | ||
2905 | If we do not do this, then we run the risk that the user will | |
2906 | delete or disable the breakpoint, but the LWP will have already | |
2907 | tripped on it. */ | |
2908 | ||
00390b84 | 2909 | if (linux_nat_lp_status_is_event (lp) |
710151dd PA |
2910 | && cancel_breakpoint (lp)) |
2911 | /* Throw away the SIGTRAP. */ | |
2912 | lp->status = 0; | |
d6b0e80f AC |
2913 | |
2914 | return 0; | |
2915 | } | |
2916 | ||
2917 | /* Select one LWP out of those that have events pending. */ | |
2918 | ||
2919 | static void | |
d90e17a7 | 2920 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
2921 | { |
2922 | int num_events = 0; | |
2923 | int random_selector; | |
2924 | struct lwp_info *event_lp; | |
2925 | ||
ac264b3b | 2926 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2927 | (*orig_lp)->status = *status; |
2928 | ||
2929 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
2930 | event_lp = iterate_over_lwps (filter, |
2931 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
2932 | if (event_lp != NULL) |
2933 | { | |
2934 | if (debug_linux_nat) | |
2935 | fprintf_unfiltered (gdb_stdlog, | |
2936 | "SEL: Select single-step %s\n", | |
2937 | target_pid_to_str (event_lp->ptid)); | |
2938 | } | |
2939 | else | |
2940 | { | |
2941 | /* No single-stepping LWP. Select one at random, out of those | |
2942 | which have had SIGTRAP events. */ | |
2943 | ||
2944 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 2945 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
2946 | |
2947 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2948 | random_selector = (int) | |
2949 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2950 | ||
2951 | if (debug_linux_nat && num_events > 1) | |
2952 | fprintf_unfiltered (gdb_stdlog, | |
2953 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2954 | num_events, random_selector); | |
2955 | ||
d90e17a7 PA |
2956 | event_lp = iterate_over_lwps (filter, |
2957 | select_event_lwp_callback, | |
d6b0e80f AC |
2958 | &random_selector); |
2959 | } | |
2960 | ||
2961 | if (event_lp != NULL) | |
2962 | { | |
2963 | /* Switch the event LWP. */ | |
2964 | *orig_lp = event_lp; | |
2965 | *status = event_lp->status; | |
2966 | } | |
2967 | ||
2968 | /* Flush the wait status for the event LWP. */ | |
2969 | (*orig_lp)->status = 0; | |
2970 | } | |
2971 | ||
2972 | /* Return non-zero if LP has been resumed. */ | |
2973 | ||
2974 | static int | |
2975 | resumed_callback (struct lwp_info *lp, void *data) | |
2976 | { | |
2977 | return lp->resumed; | |
2978 | } | |
2979 | ||
d6b0e80f AC |
2980 | /* Stop an active thread, verify it still exists, then resume it. */ |
2981 | ||
2982 | static int | |
2983 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
2984 | { | |
2985 | struct lwp_info *ptr; | |
2986 | ||
2987 | if (!lp->stopped && !lp->signalled) | |
2988 | { | |
2989 | stop_callback (lp, NULL); | |
2990 | stop_wait_callback (lp, NULL); | |
2991 | /* Resume if the lwp still exists. */ | |
2992 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
2993 | if (lp == ptr) | |
2994 | { | |
2995 | resume_callback (lp, NULL); | |
2996 | resume_set_callback (lp, NULL); | |
2997 | } | |
2998 | } | |
2999 | return 0; | |
3000 | } | |
3001 | ||
02f3fc28 | 3002 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 3003 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
3004 | static struct lwp_info * |
3005 | linux_nat_filter_event (int lwpid, int status, int options) | |
3006 | { | |
3007 | struct lwp_info *lp; | |
3008 | ||
3009 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
3010 | ||
3011 | /* Check for stop events reported by a process we didn't already | |
3012 | know about - anything not already in our LWP list. | |
3013 | ||
3014 | If we're expecting to receive stopped processes after | |
3015 | fork, vfork, and clone events, then we'll just add the | |
3016 | new one to our list and go back to waiting for the event | |
3017 | to be reported - the stopped process might be returned | |
3018 | from waitpid before or after the event is. */ | |
3019 | if (WIFSTOPPED (status) && !lp) | |
3020 | { | |
3021 | linux_record_stopped_pid (lwpid, status); | |
3022 | return NULL; | |
3023 | } | |
3024 | ||
3025 | /* Make sure we don't report an event for the exit of an LWP not in | |
1777feb0 | 3026 | our list, i.e. not part of the current process. This can happen |
fd62cb89 | 3027 | if we detach from a program we originally forked and then it |
02f3fc28 PA |
3028 | exits. */ |
3029 | if (!WIFSTOPPED (status) && !lp) | |
3030 | return NULL; | |
3031 | ||
3032 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
3033 | CLONE_PTRACE processes which do not use the thread library - | |
3034 | otherwise we wouldn't find the new LWP this way. That doesn't | |
3035 | currently work, and the following code is currently unreachable | |
3036 | due to the two blocks above. If it's fixed some day, this code | |
3037 | should be broken out into a function so that we can also pick up | |
3038 | LWPs from the new interface. */ | |
3039 | if (!lp) | |
3040 | { | |
3041 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
3042 | if (options & __WCLONE) | |
3043 | lp->cloned = 1; | |
3044 | ||
3045 | gdb_assert (WIFSTOPPED (status) | |
3046 | && WSTOPSIG (status) == SIGSTOP); | |
3047 | lp->signalled = 1; | |
3048 | ||
3049 | if (!in_thread_list (inferior_ptid)) | |
3050 | { | |
3051 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
3052 | GET_PID (inferior_ptid)); | |
3053 | add_thread (inferior_ptid); | |
3054 | } | |
3055 | ||
3056 | add_thread (lp->ptid); | |
3057 | } | |
3058 | ||
ca2163eb PA |
3059 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3060 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3061 | { | |
3062 | /* No longer need the sysgood bit. The ptrace event ends up | |
3063 | recorded in lp->waitstatus if we care for it. We can carry | |
3064 | on handling the event like a regular SIGTRAP from here | |
3065 | on. */ | |
3066 | status = W_STOPCODE (SIGTRAP); | |
3067 | if (linux_handle_syscall_trap (lp, 0)) | |
3068 | return NULL; | |
3069 | } | |
02f3fc28 | 3070 | |
ca2163eb PA |
3071 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
3072 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
02f3fc28 PA |
3073 | { |
3074 | if (debug_linux_nat) | |
3075 | fprintf_unfiltered (gdb_stdlog, | |
3076 | "LLW: Handling extended status 0x%06x\n", | |
3077 | status); | |
3078 | if (linux_handle_extended_wait (lp, status, 0)) | |
3079 | return NULL; | |
3080 | } | |
3081 | ||
26ab7092 | 3082 | if (linux_nat_status_is_event (status)) |
ebec9a0f PA |
3083 | { |
3084 | /* Save the trap's siginfo in case we need it later. */ | |
3085 | save_siginfo (lp); | |
3086 | ||
3087 | save_sigtrap (lp); | |
3088 | } | |
ca2163eb | 3089 | |
02f3fc28 | 3090 | /* Check if the thread has exited. */ |
d90e17a7 PA |
3091 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
3092 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 3093 | { |
9db03742 JB |
3094 | /* If this is the main thread, we must stop all threads and verify |
3095 | if they are still alive. This is because in the nptl thread model | |
3096 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
3097 | other than the main thread. We only get the main thread exit |
3098 | signal once all child threads have already exited. If we | |
3099 | stop all the threads and use the stop_wait_callback to check | |
3100 | if they have exited we can determine whether this signal | |
3101 | should be ignored or whether it means the end of the debugged | |
3102 | application, regardless of which threading model is being | |
5d3b6af6 | 3103 | used. */ |
02f3fc28 PA |
3104 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
3105 | { | |
3106 | lp->stopped = 1; | |
d90e17a7 PA |
3107 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
3108 | stop_and_resume_callback, NULL); | |
02f3fc28 PA |
3109 | } |
3110 | ||
3111 | if (debug_linux_nat) | |
3112 | fprintf_unfiltered (gdb_stdlog, | |
3113 | "LLW: %s exited.\n", | |
3114 | target_pid_to_str (lp->ptid)); | |
3115 | ||
d90e17a7 | 3116 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
3117 | { |
3118 | /* If there is at least one more LWP, then the exit signal | |
3119 | was not the end of the debugged application and should be | |
3120 | ignored. */ | |
3121 | exit_lwp (lp); | |
3122 | return NULL; | |
3123 | } | |
02f3fc28 PA |
3124 | } |
3125 | ||
3126 | /* Check if the current LWP has previously exited. In the nptl | |
3127 | thread model, LWPs other than the main thread do not issue | |
3128 | signals when they exit so we must check whenever the thread has | |
3129 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 3130 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 3131 | { |
d90e17a7 PA |
3132 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
3133 | ||
02f3fc28 PA |
3134 | if (debug_linux_nat) |
3135 | fprintf_unfiltered (gdb_stdlog, | |
3136 | "LLW: %s exited.\n", | |
3137 | target_pid_to_str (lp->ptid)); | |
3138 | ||
3139 | exit_lwp (lp); | |
3140 | ||
3141 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 3142 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
3143 | |
3144 | /* Discard the event. */ | |
3145 | return NULL; | |
3146 | } | |
3147 | ||
3148 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
3149 | an attempt to stop an LWP. */ | |
3150 | if (lp->signalled | |
3151 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3152 | { | |
3153 | if (debug_linux_nat) | |
3154 | fprintf_unfiltered (gdb_stdlog, | |
3155 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
3156 | target_pid_to_str (lp->ptid)); | |
3157 | ||
3158 | /* This is a delayed SIGSTOP. */ | |
3159 | lp->signalled = 0; | |
3160 | ||
3161 | registers_changed (); | |
3162 | ||
28439f5e | 3163 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
02f3fc28 PA |
3164 | lp->step, TARGET_SIGNAL_0); |
3165 | if (debug_linux_nat) | |
3166 | fprintf_unfiltered (gdb_stdlog, | |
3167 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
3168 | lp->step ? | |
3169 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3170 | target_pid_to_str (lp->ptid)); | |
3171 | ||
3172 | lp->stopped = 0; | |
3173 | gdb_assert (lp->resumed); | |
3174 | ||
3175 | /* Discard the event. */ | |
3176 | return NULL; | |
3177 | } | |
3178 | ||
57380f4e DJ |
3179 | /* Make sure we don't report a SIGINT that we have already displayed |
3180 | for another thread. */ | |
3181 | if (lp->ignore_sigint | |
3182 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3183 | { | |
3184 | if (debug_linux_nat) | |
3185 | fprintf_unfiltered (gdb_stdlog, | |
3186 | "LLW: Delayed SIGINT caught for %s.\n", | |
3187 | target_pid_to_str (lp->ptid)); | |
3188 | ||
3189 | /* This is a delayed SIGINT. */ | |
3190 | lp->ignore_sigint = 0; | |
3191 | ||
3192 | registers_changed (); | |
28439f5e | 3193 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
3194 | lp->step, TARGET_SIGNAL_0); |
3195 | if (debug_linux_nat) | |
3196 | fprintf_unfiltered (gdb_stdlog, | |
3197 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3198 | lp->step ? | |
3199 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3200 | target_pid_to_str (lp->ptid)); | |
3201 | ||
3202 | lp->stopped = 0; | |
3203 | gdb_assert (lp->resumed); | |
3204 | ||
3205 | /* Discard the event. */ | |
3206 | return NULL; | |
3207 | } | |
3208 | ||
02f3fc28 PA |
3209 | /* An interesting event. */ |
3210 | gdb_assert (lp); | |
ca2163eb | 3211 | lp->status = status; |
02f3fc28 PA |
3212 | return lp; |
3213 | } | |
3214 | ||
d6b0e80f | 3215 | static ptid_t |
7feb7d06 | 3216 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3217 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3218 | int target_options) | |
d6b0e80f | 3219 | { |
7feb7d06 | 3220 | static sigset_t prev_mask; |
d6b0e80f AC |
3221 | struct lwp_info *lp = NULL; |
3222 | int options = 0; | |
3223 | int status = 0; | |
d90e17a7 | 3224 | pid_t pid; |
d6b0e80f | 3225 | |
b84876c2 PA |
3226 | if (debug_linux_nat_async) |
3227 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); | |
3228 | ||
f973ed9c DJ |
3229 | /* The first time we get here after starting a new inferior, we may |
3230 | not have added it to the LWP list yet - this is the earliest | |
3231 | moment at which we know its PID. */ | |
d90e17a7 | 3232 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3233 | { |
27c9d204 PA |
3234 | /* Upgrade the main thread's ptid. */ |
3235 | thread_change_ptid (inferior_ptid, | |
3236 | BUILD_LWP (GET_PID (inferior_ptid), | |
3237 | GET_PID (inferior_ptid))); | |
3238 | ||
f973ed9c DJ |
3239 | lp = add_lwp (inferior_ptid); |
3240 | lp->resumed = 1; | |
3241 | } | |
3242 | ||
7feb7d06 PA |
3243 | /* Make sure SIGCHLD is blocked. */ |
3244 | block_child_signals (&prev_mask); | |
d6b0e80f | 3245 | |
d90e17a7 PA |
3246 | if (ptid_equal (ptid, minus_one_ptid)) |
3247 | pid = -1; | |
3248 | else if (ptid_is_pid (ptid)) | |
3249 | /* A request to wait for a specific tgid. This is not possible | |
3250 | with waitpid, so instead, we wait for any child, and leave | |
3251 | children we're not interested in right now with a pending | |
3252 | status to report later. */ | |
3253 | pid = -1; | |
3254 | else | |
3255 | pid = GET_LWP (ptid); | |
3256 | ||
d6b0e80f | 3257 | retry: |
d90e17a7 PA |
3258 | lp = NULL; |
3259 | status = 0; | |
d6b0e80f | 3260 | |
e3e9f5a2 PA |
3261 | /* Make sure that of those LWPs we want to get an event from, there |
3262 | is at least one LWP that has been resumed. If there's none, just | |
3263 | bail out. The core may just be flushing asynchronously all | |
3264 | events. */ | |
3265 | if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL) | |
3266 | { | |
3267 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3268 | ||
3269 | if (debug_linux_nat_async) | |
3270 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n"); | |
3271 | ||
3272 | restore_child_signals_mask (&prev_mask); | |
3273 | return minus_one_ptid; | |
3274 | } | |
d6b0e80f AC |
3275 | |
3276 | /* First check if there is a LWP with a wait status pending. */ | |
3277 | if (pid == -1) | |
3278 | { | |
3279 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 3280 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
3281 | if (lp) |
3282 | { | |
ca2163eb | 3283 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3284 | fprintf_unfiltered (gdb_stdlog, |
3285 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3286 | status_to_str (lp->status), |
d6b0e80f AC |
3287 | target_pid_to_str (lp->ptid)); |
3288 | } | |
3289 | ||
b84876c2 | 3290 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
3291 | cloned and uncloned processes. We start with the cloned |
3292 | processes. */ | |
d6b0e80f AC |
3293 | options = __WCLONE | WNOHANG; |
3294 | } | |
3295 | else if (is_lwp (ptid)) | |
3296 | { | |
3297 | if (debug_linux_nat) | |
3298 | fprintf_unfiltered (gdb_stdlog, | |
3299 | "LLW: Waiting for specific LWP %s.\n", | |
3300 | target_pid_to_str (ptid)); | |
3301 | ||
3302 | /* We have a specific LWP to check. */ | |
3303 | lp = find_lwp_pid (ptid); | |
3304 | gdb_assert (lp); | |
d6b0e80f | 3305 | |
ca2163eb | 3306 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3307 | fprintf_unfiltered (gdb_stdlog, |
3308 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3309 | status_to_str (lp->status), |
d6b0e80f AC |
3310 | target_pid_to_str (lp->ptid)); |
3311 | ||
3312 | /* If we have to wait, take into account whether PID is a cloned | |
3313 | process or not. And we have to convert it to something that | |
3314 | the layer beneath us can understand. */ | |
3315 | options = lp->cloned ? __WCLONE : 0; | |
3316 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
3317 | |
3318 | /* We check for lp->waitstatus in addition to lp->status, | |
3319 | because we can have pending process exits recorded in | |
3320 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
3321 | an additional lp->status_p flag. */ | |
ca2163eb | 3322 | if (lp->status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) |
d90e17a7 | 3323 | lp = NULL; |
d6b0e80f AC |
3324 | } |
3325 | ||
d90e17a7 | 3326 | if (lp && lp->signalled) |
d6b0e80f AC |
3327 | { |
3328 | /* A pending SIGSTOP may interfere with the normal stream of | |
3329 | events. In a typical case where interference is a problem, | |
3330 | we have a SIGSTOP signal pending for LWP A while | |
3331 | single-stepping it, encounter an event in LWP B, and take the | |
3332 | pending SIGSTOP while trying to stop LWP A. After processing | |
3333 | the event in LWP B, LWP A is continued, and we'll never see | |
3334 | the SIGTRAP associated with the last time we were | |
3335 | single-stepping LWP A. */ | |
3336 | ||
3337 | /* Resume the thread. It should halt immediately returning the | |
3338 | pending SIGSTOP. */ | |
3339 | registers_changed (); | |
28439f5e | 3340 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3341 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
3342 | if (debug_linux_nat) |
3343 | fprintf_unfiltered (gdb_stdlog, | |
3344 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
3345 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3346 | target_pid_to_str (lp->ptid)); | |
3347 | lp->stopped = 0; | |
3348 | gdb_assert (lp->resumed); | |
3349 | ||
ca2163eb PA |
3350 | /* Catch the pending SIGSTOP. */ |
3351 | status = lp->status; | |
3352 | lp->status = 0; | |
3353 | ||
d6b0e80f | 3354 | stop_wait_callback (lp, NULL); |
ca2163eb PA |
3355 | |
3356 | /* If the lp->status field isn't empty, we caught another signal | |
3357 | while flushing the SIGSTOP. Return it back to the event | |
3358 | queue of the LWP, as we already have an event to handle. */ | |
3359 | if (lp->status) | |
3360 | { | |
3361 | if (debug_linux_nat) | |
3362 | fprintf_unfiltered (gdb_stdlog, | |
3363 | "LLW: kill %s, %s\n", | |
3364 | target_pid_to_str (lp->ptid), | |
3365 | status_to_str (lp->status)); | |
3366 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
3367 | } | |
3368 | ||
3369 | lp->status = status; | |
d6b0e80f AC |
3370 | } |
3371 | ||
b84876c2 PA |
3372 | if (!target_can_async_p ()) |
3373 | { | |
3374 | /* Causes SIGINT to be passed on to the attached process. */ | |
3375 | set_sigint_trap (); | |
b84876c2 | 3376 | } |
d6b0e80f | 3377 | |
47608cb1 PA |
3378 | /* Translate generic target_wait options into waitpid options. */ |
3379 | if (target_options & TARGET_WNOHANG) | |
3380 | options |= WNOHANG; | |
7feb7d06 | 3381 | |
d90e17a7 | 3382 | while (lp == NULL) |
d6b0e80f AC |
3383 | { |
3384 | pid_t lwpid; | |
3385 | ||
7feb7d06 | 3386 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 3387 | |
d6b0e80f AC |
3388 | if (lwpid > 0) |
3389 | { | |
3390 | gdb_assert (pid == -1 || lwpid == pid); | |
3391 | ||
3392 | if (debug_linux_nat) | |
3393 | { | |
3394 | fprintf_unfiltered (gdb_stdlog, | |
3395 | "LLW: waitpid %ld received %s\n", | |
3396 | (long) lwpid, status_to_str (status)); | |
3397 | } | |
3398 | ||
02f3fc28 | 3399 | lp = linux_nat_filter_event (lwpid, status, options); |
d90e17a7 | 3400 | |
33355866 JK |
3401 | /* STATUS is now no longer valid, use LP->STATUS instead. */ |
3402 | status = 0; | |
3403 | ||
d90e17a7 PA |
3404 | if (lp |
3405 | && ptid_is_pid (ptid) | |
3406 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 3407 | { |
e3e9f5a2 PA |
3408 | gdb_assert (lp->resumed); |
3409 | ||
d90e17a7 | 3410 | if (debug_linux_nat) |
3e43a32a MS |
3411 | fprintf (stderr, |
3412 | "LWP %ld got an event %06x, leaving pending.\n", | |
33355866 | 3413 | ptid_get_lwp (lp->ptid), lp->status); |
d90e17a7 | 3414 | |
ca2163eb | 3415 | if (WIFSTOPPED (lp->status)) |
d90e17a7 | 3416 | { |
ca2163eb | 3417 | if (WSTOPSIG (lp->status) != SIGSTOP) |
d90e17a7 | 3418 | { |
e3e9f5a2 PA |
3419 | /* Cancel breakpoint hits. The breakpoint may |
3420 | be removed before we fetch events from this | |
3421 | process to report to the core. It is best | |
3422 | not to assume the moribund breakpoints | |
3423 | heuristic always handles these cases --- it | |
3424 | could be too many events go through to the | |
3425 | core before this one is handled. All-stop | |
3426 | always cancels breakpoint hits in all | |
3427 | threads. */ | |
3428 | if (non_stop | |
00390b84 | 3429 | && linux_nat_lp_status_is_event (lp) |
e3e9f5a2 PA |
3430 | && cancel_breakpoint (lp)) |
3431 | { | |
3432 | /* Throw away the SIGTRAP. */ | |
3433 | lp->status = 0; | |
3434 | ||
3435 | if (debug_linux_nat) | |
3436 | fprintf (stderr, | |
3e43a32a MS |
3437 | "LLW: LWP %ld hit a breakpoint while" |
3438 | " waiting for another process;" | |
3439 | " cancelled it\n", | |
e3e9f5a2 PA |
3440 | ptid_get_lwp (lp->ptid)); |
3441 | } | |
3442 | lp->stopped = 1; | |
d90e17a7 PA |
3443 | } |
3444 | else | |
3445 | { | |
3446 | lp->stopped = 1; | |
3447 | lp->signalled = 0; | |
3448 | } | |
3449 | } | |
33355866 | 3450 | else if (WIFEXITED (lp->status) || WIFSIGNALED (lp->status)) |
d90e17a7 PA |
3451 | { |
3452 | if (debug_linux_nat) | |
3e43a32a MS |
3453 | fprintf (stderr, |
3454 | "Process %ld exited while stopping LWPs\n", | |
d90e17a7 PA |
3455 | ptid_get_lwp (lp->ptid)); |
3456 | ||
3457 | /* This was the last lwp in the process. Since | |
3458 | events are serialized to GDB core, and we can't | |
3459 | report this one right now, but GDB core and the | |
3460 | other target layers will want to be notified | |
3461 | about the exit code/signal, leave the status | |
3462 | pending for the next time we're able to report | |
3463 | it. */ | |
d90e17a7 PA |
3464 | |
3465 | /* Prevent trying to stop this thread again. We'll | |
3466 | never try to resume it because it has a pending | |
3467 | status. */ | |
3468 | lp->stopped = 1; | |
3469 | ||
3470 | /* Dead LWP's aren't expected to reported a pending | |
3471 | sigstop. */ | |
3472 | lp->signalled = 0; | |
3473 | ||
3474 | /* Store the pending event in the waitstatus as | |
3475 | well, because W_EXITCODE(0,0) == 0. */ | |
ca2163eb | 3476 | store_waitstatus (&lp->waitstatus, lp->status); |
d90e17a7 PA |
3477 | } |
3478 | ||
3479 | /* Keep looking. */ | |
3480 | lp = NULL; | |
d6b0e80f AC |
3481 | continue; |
3482 | } | |
3483 | ||
d90e17a7 PA |
3484 | if (lp) |
3485 | break; | |
3486 | else | |
3487 | { | |
3488 | if (pid == -1) | |
3489 | { | |
3490 | /* waitpid did return something. Restart over. */ | |
3491 | options |= __WCLONE; | |
3492 | } | |
3493 | continue; | |
3494 | } | |
d6b0e80f AC |
3495 | } |
3496 | ||
3497 | if (pid == -1) | |
3498 | { | |
3499 | /* Alternate between checking cloned and uncloned processes. */ | |
3500 | options ^= __WCLONE; | |
3501 | ||
b84876c2 PA |
3502 | /* And every time we have checked both: |
3503 | In async mode, return to event loop; | |
3504 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 3505 | if (options & __WCLONE) |
b84876c2 | 3506 | { |
47608cb1 | 3507 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
3508 | { |
3509 | /* No interesting event. */ | |
3510 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3511 | ||
b84876c2 PA |
3512 | if (debug_linux_nat_async) |
3513 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3514 | ||
7feb7d06 | 3515 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
3516 | return minus_one_ptid; |
3517 | } | |
3518 | ||
3519 | sigsuspend (&suspend_mask); | |
3520 | } | |
d6b0e80f | 3521 | } |
28736962 PA |
3522 | else if (target_options & TARGET_WNOHANG) |
3523 | { | |
3524 | /* No interesting event for PID yet. */ | |
3525 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3526 | ||
3527 | if (debug_linux_nat_async) | |
3528 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3529 | ||
3530 | restore_child_signals_mask (&prev_mask); | |
3531 | return minus_one_ptid; | |
3532 | } | |
d6b0e80f AC |
3533 | |
3534 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3535 | gdb_assert (lp == NULL); |
d6b0e80f AC |
3536 | } |
3537 | ||
b84876c2 | 3538 | if (!target_can_async_p ()) |
d26b5354 | 3539 | clear_sigint_trap (); |
d6b0e80f AC |
3540 | |
3541 | gdb_assert (lp); | |
3542 | ||
ca2163eb PA |
3543 | status = lp->status; |
3544 | lp->status = 0; | |
3545 | ||
d6b0e80f AC |
3546 | /* Don't report signals that GDB isn't interested in, such as |
3547 | signals that are neither printed nor stopped upon. Stopping all | |
3548 | threads can be a bit time-consuming so if we want decent | |
3549 | performance with heavily multi-threaded programs, especially when | |
3550 | they're using a high frequency timer, we'd better avoid it if we | |
3551 | can. */ | |
3552 | ||
3553 | if (WIFSTOPPED (status)) | |
3554 | { | |
423ec54c | 3555 | enum target_signal signo = target_signal_from_host (WSTOPSIG (status)); |
d6b48e9c PA |
3556 | struct inferior *inf; |
3557 | ||
3558 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
3559 | gdb_assert (inf); | |
d6b0e80f | 3560 | |
d6b48e9c PA |
3561 | /* Defer to common code if we get a signal while |
3562 | single-stepping, since that may need special care, e.g. to | |
3563 | skip the signal handler, or, if we're gaining control of the | |
3564 | inferior. */ | |
d539ed7e | 3565 | if (!lp->step |
16c381f0 | 3566 | && inf->control.stop_soon == NO_STOP_QUIETLY |
d539ed7e | 3567 | && signal_stop_state (signo) == 0 |
d6b0e80f AC |
3568 | && signal_print_state (signo) == 0 |
3569 | && signal_pass_state (signo) == 1) | |
3570 | { | |
3571 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3572 | here? It is not clear we should. GDB may not expect | |
3573 | other threads to run. On the other hand, not resuming | |
3574 | newly attached threads may cause an unwanted delay in | |
3575 | getting them running. */ | |
3576 | registers_changed (); | |
28439f5e | 3577 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3578 | lp->step, signo); |
d6b0e80f AC |
3579 | if (debug_linux_nat) |
3580 | fprintf_unfiltered (gdb_stdlog, | |
3581 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3582 | lp->step ? | |
3583 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3584 | target_pid_to_str (lp->ptid), | |
423ec54c JK |
3585 | (signo != TARGET_SIGNAL_0 |
3586 | ? strsignal (target_signal_to_host (signo)) | |
3587 | : "0")); | |
d6b0e80f | 3588 | lp->stopped = 0; |
d6b0e80f AC |
3589 | goto retry; |
3590 | } | |
3591 | ||
1ad15515 | 3592 | if (!non_stop) |
d6b0e80f | 3593 | { |
1ad15515 PA |
3594 | /* Only do the below in all-stop, as we currently use SIGINT |
3595 | to implement target_stop (see linux_nat_stop) in | |
3596 | non-stop. */ | |
3597 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3598 | { | |
3599 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3600 | forwarded to the entire process group, that is, all LWPs | |
3601 | will receive it - unless they're using CLONE_THREAD to | |
3602 | share signals. Since we only want to report it once, we | |
3603 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3604 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3605 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3606 | lp->ignore_sigint = 0; |
3607 | } | |
3608 | else | |
3609 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3610 | } |
3611 | } | |
3612 | ||
3613 | /* This LWP is stopped now. */ | |
3614 | lp->stopped = 1; | |
3615 | ||
3616 | if (debug_linux_nat) | |
3617 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3618 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3619 | ||
4c28f408 PA |
3620 | if (!non_stop) |
3621 | { | |
3622 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3623 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3624 | |
3625 | /* ... and wait until all of them have reported back that | |
3626 | they're no longer running. */ | |
d90e17a7 | 3627 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3628 | |
3629 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3630 | from among those that have had events. Giving equal priority | |
3631 | to all LWPs that have had events helps prevent | |
3632 | starvation. */ | |
3633 | if (pid == -1) | |
d90e17a7 | 3634 | select_event_lwp (ptid, &lp, &status); |
d6b0e80f | 3635 | |
e3e9f5a2 PA |
3636 | /* Now that we've selected our final event LWP, cancel any |
3637 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
3638 | See the comment in cancel_breakpoints_callback to find out | |
3639 | why. */ | |
3640 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); | |
3641 | ||
3642 | /* In all-stop, from the core's perspective, all LWPs are now | |
3643 | stopped until a new resume action is sent over. */ | |
3644 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
3645 | } | |
3646 | else | |
3647 | lp->resumed = 0; | |
d6b0e80f | 3648 | |
26ab7092 | 3649 | if (linux_nat_status_is_event (status)) |
d6b0e80f | 3650 | { |
d6b0e80f AC |
3651 | if (debug_linux_nat) |
3652 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3653 | "LLW: trap ptid is %s.\n", |
3654 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3655 | } |
d6b0e80f AC |
3656 | |
3657 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3658 | { | |
3659 | *ourstatus = lp->waitstatus; | |
3660 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3661 | } | |
3662 | else | |
3663 | store_waitstatus (ourstatus, status); | |
3664 | ||
b84876c2 PA |
3665 | if (debug_linux_nat_async) |
3666 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); | |
3667 | ||
7feb7d06 | 3668 | restore_child_signals_mask (&prev_mask); |
1e225492 JK |
3669 | |
3670 | if (ourstatus->kind == TARGET_WAITKIND_EXITED | |
3671 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
3672 | lp->core = -1; | |
3673 | else | |
3674 | lp->core = linux_nat_core_of_thread_1 (lp->ptid); | |
3675 | ||
f973ed9c | 3676 | return lp->ptid; |
d6b0e80f AC |
3677 | } |
3678 | ||
e3e9f5a2 PA |
3679 | /* Resume LWPs that are currently stopped without any pending status |
3680 | to report, but are resumed from the core's perspective. */ | |
3681 | ||
3682 | static int | |
3683 | resume_stopped_resumed_lwps (struct lwp_info *lp, void *data) | |
3684 | { | |
3685 | ptid_t *wait_ptid_p = data; | |
3686 | ||
3687 | if (lp->stopped | |
3688 | && lp->resumed | |
3689 | && lp->status == 0 | |
3690 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
3691 | { | |
3692 | gdb_assert (is_executing (lp->ptid)); | |
3693 | ||
3694 | /* Don't bother if there's a breakpoint at PC that we'd hit | |
3695 | immediately, and we're not waiting for this LWP. */ | |
3696 | if (!ptid_match (lp->ptid, *wait_ptid_p)) | |
3697 | { | |
3698 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
3699 | CORE_ADDR pc = regcache_read_pc (regcache); | |
3700 | ||
3701 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3702 | return 0; | |
3703 | } | |
3704 | ||
3705 | if (debug_linux_nat) | |
3706 | fprintf_unfiltered (gdb_stdlog, | |
3707 | "RSRL: resuming stopped-resumed LWP %s\n", | |
3708 | target_pid_to_str (lp->ptid)); | |
3709 | ||
3710 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
3711 | lp->step, TARGET_SIGNAL_0); | |
3712 | lp->stopped = 0; | |
3713 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
3714 | lp->stopped_by_watchpoint = 0; | |
3715 | } | |
3716 | ||
3717 | return 0; | |
3718 | } | |
3719 | ||
7feb7d06 PA |
3720 | static ptid_t |
3721 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3722 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3723 | int target_options) | |
7feb7d06 PA |
3724 | { |
3725 | ptid_t event_ptid; | |
3726 | ||
3727 | if (debug_linux_nat) | |
3e43a32a MS |
3728 | fprintf_unfiltered (gdb_stdlog, |
3729 | "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
7feb7d06 PA |
3730 | |
3731 | /* Flush the async file first. */ | |
3732 | if (target_can_async_p ()) | |
3733 | async_file_flush (); | |
3734 | ||
e3e9f5a2 PA |
3735 | /* Resume LWPs that are currently stopped without any pending status |
3736 | to report, but are resumed from the core's perspective. LWPs get | |
3737 | in this state if we find them stopping at a time we're not | |
3738 | interested in reporting the event (target_wait on a | |
3739 | specific_process, for example, see linux_nat_wait_1), and | |
3740 | meanwhile the event became uninteresting. Don't bother resuming | |
3741 | LWPs we're not going to wait for if they'd stop immediately. */ | |
3742 | if (non_stop) | |
3743 | iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid); | |
3744 | ||
47608cb1 | 3745 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3746 | |
3747 | /* If we requested any event, and something came out, assume there | |
3748 | may be more. If we requested a specific lwp or process, also | |
3749 | assume there may be more. */ | |
3750 | if (target_can_async_p () | |
3751 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3752 | || !ptid_equal (ptid, minus_one_ptid))) | |
3753 | async_file_mark (); | |
3754 | ||
3755 | /* Get ready for the next event. */ | |
3756 | if (target_can_async_p ()) | |
3757 | target_async (inferior_event_handler, 0); | |
3758 | ||
3759 | return event_ptid; | |
3760 | } | |
3761 | ||
d6b0e80f AC |
3762 | static int |
3763 | kill_callback (struct lwp_info *lp, void *data) | |
3764 | { | |
3765 | errno = 0; | |
3766 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3767 | if (debug_linux_nat) | |
3768 | fprintf_unfiltered (gdb_stdlog, | |
3769 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3770 | target_pid_to_str (lp->ptid), | |
3771 | errno ? safe_strerror (errno) : "OK"); | |
3772 | ||
3773 | return 0; | |
3774 | } | |
3775 | ||
3776 | static int | |
3777 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3778 | { | |
3779 | pid_t pid; | |
3780 | ||
3781 | /* We must make sure that there are no pending events (delayed | |
3782 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3783 | program doesn't interfere with any following debugging session. */ | |
3784 | ||
3785 | /* For cloned processes we must check both with __WCLONE and | |
3786 | without, since the exit status of a cloned process isn't reported | |
3787 | with __WCLONE. */ | |
3788 | if (lp->cloned) | |
3789 | { | |
3790 | do | |
3791 | { | |
58aecb61 | 3792 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3793 | if (pid != (pid_t) -1) |
d6b0e80f | 3794 | { |
e85a822c DJ |
3795 | if (debug_linux_nat) |
3796 | fprintf_unfiltered (gdb_stdlog, | |
3797 | "KWC: wait %s received unknown.\n", | |
3798 | target_pid_to_str (lp->ptid)); | |
3799 | /* The Linux kernel sometimes fails to kill a thread | |
3800 | completely after PTRACE_KILL; that goes from the stop | |
3801 | point in do_fork out to the one in | |
3802 | get_signal_to_deliever and waits again. So kill it | |
3803 | again. */ | |
3804 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3805 | } |
3806 | } | |
3807 | while (pid == GET_LWP (lp->ptid)); | |
3808 | ||
3809 | gdb_assert (pid == -1 && errno == ECHILD); | |
3810 | } | |
3811 | ||
3812 | do | |
3813 | { | |
58aecb61 | 3814 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3815 | if (pid != (pid_t) -1) |
d6b0e80f | 3816 | { |
e85a822c DJ |
3817 | if (debug_linux_nat) |
3818 | fprintf_unfiltered (gdb_stdlog, | |
3819 | "KWC: wait %s received unk.\n", | |
3820 | target_pid_to_str (lp->ptid)); | |
3821 | /* See the call to kill_callback above. */ | |
3822 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3823 | } |
3824 | } | |
3825 | while (pid == GET_LWP (lp->ptid)); | |
3826 | ||
3827 | gdb_assert (pid == -1 && errno == ECHILD); | |
3828 | return 0; | |
3829 | } | |
3830 | ||
3831 | static void | |
7d85a9c0 | 3832 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3833 | { |
f973ed9c DJ |
3834 | struct target_waitstatus last; |
3835 | ptid_t last_ptid; | |
3836 | int status; | |
d6b0e80f | 3837 | |
f973ed9c DJ |
3838 | /* If we're stopped while forking and we haven't followed yet, |
3839 | kill the other task. We need to do this first because the | |
3840 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3841 | |
f973ed9c | 3842 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3843 | |
f973ed9c DJ |
3844 | if (last.kind == TARGET_WAITKIND_FORKED |
3845 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3846 | { | |
3a3e9ee3 | 3847 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3848 | wait (&status); |
3849 | } | |
3850 | ||
3851 | if (forks_exist_p ()) | |
7feb7d06 | 3852 | linux_fork_killall (); |
f973ed9c DJ |
3853 | else |
3854 | { | |
d90e17a7 | 3855 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
e0881a8e | 3856 | |
4c28f408 PA |
3857 | /* Stop all threads before killing them, since ptrace requires |
3858 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3859 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3860 | /* ... and wait until all of them have reported back that |
3861 | they're no longer running. */ | |
d90e17a7 | 3862 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3863 | |
f973ed9c | 3864 | /* Kill all LWP's ... */ |
d90e17a7 | 3865 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3866 | |
3867 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3868 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3869 | } |
3870 | ||
3871 | target_mourn_inferior (); | |
d6b0e80f AC |
3872 | } |
3873 | ||
3874 | static void | |
136d6dae | 3875 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3876 | { |
d90e17a7 | 3877 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 3878 | |
f973ed9c | 3879 | if (! forks_exist_p ()) |
d90e17a7 PA |
3880 | /* Normal case, no other forks available. */ |
3881 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3882 | else |
3883 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3884 | there are other viable forks to debug. Delete the exiting | |
3885 | one and context-switch to the first available. */ | |
3886 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3887 | } |
3888 | ||
5b009018 PA |
3889 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3890 | layout of the inferiors' architecture. */ | |
3891 | ||
3892 | static void | |
3893 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
3894 | { | |
3895 | int done = 0; | |
3896 | ||
3897 | if (linux_nat_siginfo_fixup != NULL) | |
3898 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3899 | ||
3900 | /* If there was no callback, or the callback didn't do anything, | |
3901 | then just do a straight memcpy. */ | |
3902 | if (!done) | |
3903 | { | |
3904 | if (direction == 1) | |
3905 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3906 | else | |
3907 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3908 | } | |
3909 | } | |
3910 | ||
4aa995e1 PA |
3911 | static LONGEST |
3912 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
3913 | const char *annex, gdb_byte *readbuf, | |
3914 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3915 | { | |
4aa995e1 PA |
3916 | int pid; |
3917 | struct siginfo siginfo; | |
5b009018 | 3918 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3919 | |
3920 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3921 | gdb_assert (readbuf || writebuf); | |
3922 | ||
3923 | pid = GET_LWP (inferior_ptid); | |
3924 | if (pid == 0) | |
3925 | pid = GET_PID (inferior_ptid); | |
3926 | ||
3927 | if (offset > sizeof (siginfo)) | |
3928 | return -1; | |
3929 | ||
3930 | errno = 0; | |
3931 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3932 | if (errno != 0) | |
3933 | return -1; | |
3934 | ||
5b009018 PA |
3935 | /* When GDB is built as a 64-bit application, ptrace writes into |
3936 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3937 | inferior with a 64-bit GDB should look the same as debugging it | |
3938 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3939 | the converted layout, so any read/write will have to be done | |
3940 | post-conversion. */ | |
3941 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3942 | ||
4aa995e1 PA |
3943 | if (offset + len > sizeof (siginfo)) |
3944 | len = sizeof (siginfo) - offset; | |
3945 | ||
3946 | if (readbuf != NULL) | |
5b009018 | 3947 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3948 | else |
3949 | { | |
5b009018 PA |
3950 | memcpy (inf_siginfo + offset, writebuf, len); |
3951 | ||
3952 | /* Convert back to ptrace layout before flushing it out. */ | |
3953 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3954 | ||
4aa995e1 PA |
3955 | errno = 0; |
3956 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3957 | if (errno != 0) | |
3958 | return -1; | |
3959 | } | |
3960 | ||
3961 | return len; | |
3962 | } | |
3963 | ||
10d6c8cd DJ |
3964 | static LONGEST |
3965 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
3966 | const char *annex, gdb_byte *readbuf, | |
3967 | const gdb_byte *writebuf, | |
3968 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 3969 | { |
4aa995e1 | 3970 | struct cleanup *old_chain; |
10d6c8cd | 3971 | LONGEST xfer; |
d6b0e80f | 3972 | |
4aa995e1 PA |
3973 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3974 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
3975 | offset, len); | |
3976 | ||
c35b1492 PA |
3977 | /* The target is connected but no live inferior is selected. Pass |
3978 | this request down to a lower stratum (e.g., the executable | |
3979 | file). */ | |
3980 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
3981 | return 0; | |
3982 | ||
4aa995e1 PA |
3983 | old_chain = save_inferior_ptid (); |
3984 | ||
d6b0e80f AC |
3985 | if (is_lwp (inferior_ptid)) |
3986 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
3987 | ||
10d6c8cd DJ |
3988 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
3989 | offset, len); | |
d6b0e80f AC |
3990 | |
3991 | do_cleanups (old_chain); | |
3992 | return xfer; | |
3993 | } | |
3994 | ||
3995 | static int | |
28439f5e | 3996 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 3997 | { |
8c6a60d1 | 3998 | int err, tmp_errno; |
4c28f408 | 3999 | |
d6b0e80f AC |
4000 | gdb_assert (is_lwp (ptid)); |
4001 | ||
4c28f408 PA |
4002 | /* Send signal 0 instead of anything ptrace, because ptracing a |
4003 | running thread errors out claiming that the thread doesn't | |
4004 | exist. */ | |
4005 | err = kill_lwp (GET_LWP (ptid), 0); | |
8c6a60d1 | 4006 | tmp_errno = errno; |
d6b0e80f AC |
4007 | if (debug_linux_nat) |
4008 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 4009 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 4010 | target_pid_to_str (ptid), |
8c6a60d1 | 4011 | err ? safe_strerror (tmp_errno) : "OK"); |
9c0dd46b | 4012 | |
4c28f408 | 4013 | if (err != 0) |
d6b0e80f AC |
4014 | return 0; |
4015 | ||
4016 | return 1; | |
4017 | } | |
4018 | ||
28439f5e PA |
4019 | static int |
4020 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
4021 | { | |
4022 | return linux_thread_alive (ptid); | |
4023 | } | |
4024 | ||
d6b0e80f | 4025 | static char * |
117de6a9 | 4026 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
4027 | { |
4028 | static char buf[64]; | |
4029 | ||
a0ef4274 | 4030 | if (is_lwp (ptid) |
d90e17a7 PA |
4031 | && (GET_PID (ptid) != GET_LWP (ptid) |
4032 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
4033 | { |
4034 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
4035 | return buf; | |
4036 | } | |
4037 | ||
4038 | return normal_pid_to_str (ptid); | |
4039 | } | |
4040 | ||
4694da01 TT |
4041 | static char * |
4042 | linux_nat_thread_name (struct thread_info *thr) | |
4043 | { | |
4044 | int pid = ptid_get_pid (thr->ptid); | |
4045 | long lwp = ptid_get_lwp (thr->ptid); | |
4046 | #define FORMAT "/proc/%d/task/%ld/comm" | |
4047 | char buf[sizeof (FORMAT) + 30]; | |
4048 | FILE *comm_file; | |
4049 | char *result = NULL; | |
4050 | ||
4051 | snprintf (buf, sizeof (buf), FORMAT, pid, lwp); | |
4052 | comm_file = fopen (buf, "r"); | |
4053 | if (comm_file) | |
4054 | { | |
4055 | /* Not exported by the kernel, so we define it here. */ | |
4056 | #define COMM_LEN 16 | |
4057 | static char line[COMM_LEN + 1]; | |
4058 | ||
4059 | if (fgets (line, sizeof (line), comm_file)) | |
4060 | { | |
4061 | char *nl = strchr (line, '\n'); | |
4062 | ||
4063 | if (nl) | |
4064 | *nl = '\0'; | |
4065 | if (*line != '\0') | |
4066 | result = line; | |
4067 | } | |
4068 | ||
4069 | fclose (comm_file); | |
4070 | } | |
4071 | ||
4072 | #undef COMM_LEN | |
4073 | #undef FORMAT | |
4074 | ||
4075 | return result; | |
4076 | } | |
4077 | ||
dba24537 AC |
4078 | /* Accepts an integer PID; Returns a string representing a file that |
4079 | can be opened to get the symbols for the child process. */ | |
4080 | ||
6d8fd2b7 UW |
4081 | static char * |
4082 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
4083 | { |
4084 | char *name1, *name2; | |
4085 | ||
4086 | name1 = xmalloc (MAXPATHLEN); | |
4087 | name2 = xmalloc (MAXPATHLEN); | |
4088 | make_cleanup (xfree, name1); | |
4089 | make_cleanup (xfree, name2); | |
4090 | memset (name2, 0, MAXPATHLEN); | |
4091 | ||
4092 | sprintf (name1, "/proc/%d/exe", pid); | |
4093 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
4094 | return name2; | |
4095 | else | |
4096 | return name1; | |
4097 | } | |
4098 | ||
4099 | /* Service function for corefiles and info proc. */ | |
4100 | ||
4101 | static int | |
4102 | read_mapping (FILE *mapfile, | |
4103 | long long *addr, | |
4104 | long long *endaddr, | |
4105 | char *permissions, | |
4106 | long long *offset, | |
4107 | char *device, long long *inode, char *filename) | |
4108 | { | |
4109 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
4110 | addr, endaddr, permissions, offset, device, inode); | |
4111 | ||
2e14c2ea MS |
4112 | filename[0] = '\0'; |
4113 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
4114 | { |
4115 | /* Eat everything up to EOL for the filename. This will prevent | |
4116 | weird filenames (such as one with embedded whitespace) from | |
4117 | confusing this code. It also makes this code more robust in | |
4118 | respect to annotations the kernel may add after the filename. | |
4119 | ||
4120 | Note the filename is used for informational purposes | |
4121 | only. */ | |
4122 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
4123 | } | |
2e14c2ea | 4124 | |
dba24537 AC |
4125 | return (ret != 0 && ret != EOF); |
4126 | } | |
4127 | ||
4128 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
4129 | regions in the inferior for a corefile. */ | |
4130 | ||
4131 | static int | |
b8edc417 | 4132 | linux_nat_find_memory_regions (find_memory_region_ftype func, void *obfd) |
dba24537 | 4133 | { |
89ecc4f5 | 4134 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
4135 | char mapsfilename[MAXPATHLEN]; |
4136 | FILE *mapsfile; | |
4137 | long long addr, endaddr, size, offset, inode; | |
4138 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
4139 | int read, write, exec; | |
7c8a8b04 | 4140 | struct cleanup *cleanup; |
dba24537 AC |
4141 | |
4142 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 4143 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 4144 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 4145 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 4146 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
4147 | |
4148 | if (info_verbose) | |
4149 | fprintf_filtered (gdb_stdout, | |
4150 | "Reading memory regions from %s\n", mapsfilename); | |
4151 | ||
4152 | /* Now iterate until end-of-file. */ | |
4153 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
4154 | &offset, &device[0], &inode, &filename[0])) | |
4155 | { | |
4156 | size = endaddr - addr; | |
4157 | ||
4158 | /* Get the segment's permissions. */ | |
4159 | read = (strchr (permissions, 'r') != 0); | |
4160 | write = (strchr (permissions, 'w') != 0); | |
4161 | exec = (strchr (permissions, 'x') != 0); | |
4162 | ||
4163 | if (info_verbose) | |
4164 | { | |
4165 | fprintf_filtered (gdb_stdout, | |
2244ba2e PM |
4166 | "Save segment, %s bytes at %s (%c%c%c)", |
4167 | plongest (size), paddress (target_gdbarch, addr), | |
dba24537 AC |
4168 | read ? 'r' : ' ', |
4169 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 4170 | if (filename[0]) |
dba24537 AC |
4171 | fprintf_filtered (gdb_stdout, " for %s", filename); |
4172 | fprintf_filtered (gdb_stdout, "\n"); | |
4173 | } | |
4174 | ||
4175 | /* Invoke the callback function to create the corefile | |
4176 | segment. */ | |
4177 | func (addr, size, read, write, exec, obfd); | |
4178 | } | |
7c8a8b04 | 4179 | do_cleanups (cleanup); |
dba24537 AC |
4180 | return 0; |
4181 | } | |
4182 | ||
2020b7ab PA |
4183 | static int |
4184 | find_signalled_thread (struct thread_info *info, void *data) | |
4185 | { | |
16c381f0 | 4186 | if (info->suspend.stop_signal != TARGET_SIGNAL_0 |
2020b7ab PA |
4187 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) |
4188 | return 1; | |
4189 | ||
4190 | return 0; | |
4191 | } | |
4192 | ||
4193 | static enum target_signal | |
4194 | find_stop_signal (void) | |
4195 | { | |
4196 | struct thread_info *info = | |
4197 | iterate_over_threads (find_signalled_thread, NULL); | |
4198 | ||
4199 | if (info) | |
16c381f0 | 4200 | return info->suspend.stop_signal; |
2020b7ab PA |
4201 | else |
4202 | return TARGET_SIGNAL_0; | |
4203 | } | |
4204 | ||
dba24537 AC |
4205 | /* Records the thread's register state for the corefile note |
4206 | section. */ | |
4207 | ||
4208 | static char * | |
4209 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
4210 | char *note_data, int *note_size, |
4211 | enum target_signal stop_signal) | |
dba24537 | 4212 | { |
dba24537 | 4213 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
4214 | struct gdbarch *gdbarch = target_gdbarch; |
4215 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 4216 | const struct regset *regset; |
55e969c1 | 4217 | int core_regset_p; |
594f7785 | 4218 | struct cleanup *old_chain; |
17ea7499 CES |
4219 | struct core_regset_section *sect_list; |
4220 | char *gdb_regset; | |
594f7785 UW |
4221 | |
4222 | old_chain = save_inferior_ptid (); | |
4223 | inferior_ptid = ptid; | |
4224 | target_fetch_registers (regcache, -1); | |
4225 | do_cleanups (old_chain); | |
4f844a66 DM |
4226 | |
4227 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
4228 | sect_list = gdbarch_core_regset_sections (gdbarch); |
4229 | ||
17ea7499 CES |
4230 | /* The loop below uses the new struct core_regset_section, which stores |
4231 | the supported section names and sizes for the core file. Note that | |
4232 | note PRSTATUS needs to be treated specially. But the other notes are | |
4233 | structurally the same, so they can benefit from the new struct. */ | |
4234 | if (core_regset_p && sect_list != NULL) | |
4235 | while (sect_list->sect_name != NULL) | |
4236 | { | |
17ea7499 CES |
4237 | regset = gdbarch_regset_from_core_section (gdbarch, |
4238 | sect_list->sect_name, | |
4239 | sect_list->size); | |
4240 | gdb_assert (regset && regset->collect_regset); | |
4241 | gdb_regset = xmalloc (sect_list->size); | |
4242 | regset->collect_regset (regset, regcache, -1, | |
4243 | gdb_regset, sect_list->size); | |
2f2241f1 UW |
4244 | |
4245 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
4246 | note_data = (char *) elfcore_write_prstatus | |
4247 | (obfd, note_data, note_size, | |
857d11d0 JK |
4248 | lwp, target_signal_to_host (stop_signal), |
4249 | gdb_regset); | |
2f2241f1 UW |
4250 | else |
4251 | note_data = (char *) elfcore_write_register_note | |
4252 | (obfd, note_data, note_size, | |
4253 | sect_list->sect_name, gdb_regset, | |
4254 | sect_list->size); | |
17ea7499 CES |
4255 | xfree (gdb_regset); |
4256 | sect_list++; | |
4257 | } | |
dba24537 | 4258 | |
17ea7499 CES |
4259 | /* For architectures that does not have the struct core_regset_section |
4260 | implemented, we use the old method. When all the architectures have | |
4261 | the new support, the code below should be deleted. */ | |
4f844a66 | 4262 | else |
17ea7499 | 4263 | { |
2f2241f1 UW |
4264 | gdb_gregset_t gregs; |
4265 | gdb_fpregset_t fpregs; | |
4266 | ||
4267 | if (core_regset_p | |
4268 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3e43a32a MS |
4269 | sizeof (gregs))) |
4270 | != NULL && regset->collect_regset != NULL) | |
2f2241f1 UW |
4271 | regset->collect_regset (regset, regcache, -1, |
4272 | &gregs, sizeof (gregs)); | |
4273 | else | |
4274 | fill_gregset (regcache, &gregs, -1); | |
4275 | ||
857d11d0 JK |
4276 | note_data = (char *) elfcore_write_prstatus |
4277 | (obfd, note_data, note_size, lwp, target_signal_to_host (stop_signal), | |
4278 | &gregs); | |
2f2241f1 | 4279 | |
17ea7499 CES |
4280 | if (core_regset_p |
4281 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3e43a32a MS |
4282 | sizeof (fpregs))) |
4283 | != NULL && regset->collect_regset != NULL) | |
17ea7499 CES |
4284 | regset->collect_regset (regset, regcache, -1, |
4285 | &fpregs, sizeof (fpregs)); | |
4286 | else | |
4287 | fill_fpregset (regcache, &fpregs, -1); | |
4288 | ||
4289 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
4290 | note_data, | |
4291 | note_size, | |
4292 | &fpregs, sizeof (fpregs)); | |
4293 | } | |
4f844a66 | 4294 | |
dba24537 AC |
4295 | return note_data; |
4296 | } | |
4297 | ||
4298 | struct linux_nat_corefile_thread_data | |
4299 | { | |
4300 | bfd *obfd; | |
4301 | char *note_data; | |
4302 | int *note_size; | |
4303 | int num_notes; | |
2020b7ab | 4304 | enum target_signal stop_signal; |
dba24537 AC |
4305 | }; |
4306 | ||
4307 | /* Called by gdbthread.c once per thread. Records the thread's | |
4308 | register state for the corefile note section. */ | |
4309 | ||
4310 | static int | |
4311 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
4312 | { | |
4313 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 4314 | |
dba24537 AC |
4315 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
4316 | ti->ptid, | |
4317 | args->note_data, | |
2020b7ab PA |
4318 | args->note_size, |
4319 | args->stop_signal); | |
dba24537 | 4320 | args->num_notes++; |
56be3814 | 4321 | |
dba24537 AC |
4322 | return 0; |
4323 | } | |
4324 | ||
efcbbd14 UW |
4325 | /* Enumerate spufs IDs for process PID. */ |
4326 | ||
4327 | static void | |
4328 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
4329 | { | |
4330 | char path[128]; | |
4331 | DIR *dir; | |
4332 | struct dirent *entry; | |
4333 | ||
4334 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4335 | dir = opendir (path); | |
4336 | if (!dir) | |
4337 | return; | |
4338 | ||
4339 | rewinddir (dir); | |
4340 | while ((entry = readdir (dir)) != NULL) | |
4341 | { | |
4342 | struct stat st; | |
4343 | struct statfs stfs; | |
4344 | int fd; | |
4345 | ||
4346 | fd = atoi (entry->d_name); | |
4347 | if (!fd) | |
4348 | continue; | |
4349 | ||
4350 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4351 | if (stat (path, &st) != 0) | |
4352 | continue; | |
4353 | if (!S_ISDIR (st.st_mode)) | |
4354 | continue; | |
4355 | ||
4356 | if (statfs (path, &stfs) != 0) | |
4357 | continue; | |
4358 | if (stfs.f_type != SPUFS_MAGIC) | |
4359 | continue; | |
4360 | ||
4361 | callback (data, fd); | |
4362 | } | |
4363 | ||
4364 | closedir (dir); | |
4365 | } | |
4366 | ||
4367 | /* Generate corefile notes for SPU contexts. */ | |
4368 | ||
4369 | struct linux_spu_corefile_data | |
4370 | { | |
4371 | bfd *obfd; | |
4372 | char *note_data; | |
4373 | int *note_size; | |
4374 | }; | |
4375 | ||
4376 | static void | |
4377 | linux_spu_corefile_callback (void *data, int fd) | |
4378 | { | |
4379 | struct linux_spu_corefile_data *args = data; | |
4380 | int i; | |
4381 | ||
4382 | static const char *spu_files[] = | |
4383 | { | |
4384 | "object-id", | |
4385 | "mem", | |
4386 | "regs", | |
4387 | "fpcr", | |
4388 | "lslr", | |
4389 | "decr", | |
4390 | "decr_status", | |
4391 | "signal1", | |
4392 | "signal1_type", | |
4393 | "signal2", | |
4394 | "signal2_type", | |
4395 | "event_mask", | |
4396 | "event_status", | |
4397 | "mbox_info", | |
4398 | "ibox_info", | |
4399 | "wbox_info", | |
4400 | "dma_info", | |
4401 | "proxydma_info", | |
4402 | }; | |
4403 | ||
4404 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
4405 | { | |
4406 | char annex[32], note_name[32]; | |
4407 | gdb_byte *spu_data; | |
4408 | LONGEST spu_len; | |
4409 | ||
4410 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
4411 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
4412 | annex, &spu_data); | |
4413 | if (spu_len > 0) | |
4414 | { | |
4415 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
4416 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
4417 | args->note_size, note_name, | |
4418 | NT_SPU, spu_data, spu_len); | |
4419 | xfree (spu_data); | |
4420 | } | |
4421 | } | |
4422 | } | |
4423 | ||
4424 | static char * | |
4425 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
4426 | { | |
4427 | struct linux_spu_corefile_data args; | |
e0881a8e | 4428 | |
efcbbd14 UW |
4429 | args.obfd = obfd; |
4430 | args.note_data = note_data; | |
4431 | args.note_size = note_size; | |
4432 | ||
4433 | iterate_over_spus (PIDGET (inferior_ptid), | |
4434 | linux_spu_corefile_callback, &args); | |
4435 | ||
4436 | return args.note_data; | |
4437 | } | |
4438 | ||
dba24537 AC |
4439 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
4440 | section for a corefile, and returns it in a malloc buffer. */ | |
4441 | ||
4442 | static char * | |
4443 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
4444 | { | |
4445 | struct linux_nat_corefile_thread_data thread_args; | |
d99148ef | 4446 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 4447 | char fname[16] = { '\0' }; |
d99148ef | 4448 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
4449 | char psargs[80] = { '\0' }; |
4450 | char *note_data = NULL; | |
d90e17a7 | 4451 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 4452 | gdb_byte *auxv; |
dba24537 AC |
4453 | int auxv_len; |
4454 | ||
4455 | if (get_exec_file (0)) | |
4456 | { | |
9f37bbcc | 4457 | strncpy (fname, lbasename (get_exec_file (0)), sizeof (fname)); |
dba24537 AC |
4458 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); |
4459 | if (get_inferior_args ()) | |
4460 | { | |
d99148ef JK |
4461 | char *string_end; |
4462 | char *psargs_end = psargs + sizeof (psargs); | |
4463 | ||
4464 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
4465 | strings fine. */ | |
4466 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
4467 | if (string_end != NULL) | |
4468 | { | |
4469 | *string_end++ = ' '; | |
4470 | strncpy (string_end, get_inferior_args (), | |
4471 | psargs_end - string_end); | |
4472 | } | |
dba24537 AC |
4473 | } |
4474 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
4475 | note_data, | |
4476 | note_size, fname, psargs); | |
4477 | } | |
4478 | ||
4479 | /* Dump information for threads. */ | |
4480 | thread_args.obfd = obfd; | |
4481 | thread_args.note_data = note_data; | |
4482 | thread_args.note_size = note_size; | |
4483 | thread_args.num_notes = 0; | |
2020b7ab | 4484 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 4485 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
4486 | gdb_assert (thread_args.num_notes != 0); |
4487 | note_data = thread_args.note_data; | |
dba24537 | 4488 | |
13547ab6 DJ |
4489 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
4490 | NULL, &auxv); | |
dba24537 AC |
4491 | if (auxv_len > 0) |
4492 | { | |
4493 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
4494 | "CORE", NT_AUXV, auxv, auxv_len); | |
4495 | xfree (auxv); | |
4496 | } | |
4497 | ||
efcbbd14 UW |
4498 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
4499 | ||
dba24537 AC |
4500 | make_cleanup (xfree, note_data); |
4501 | return note_data; | |
4502 | } | |
4503 | ||
4504 | /* Implement the "info proc" command. */ | |
4505 | ||
4506 | static void | |
4507 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
4508 | { | |
89ecc4f5 DE |
4509 | /* A long is used for pid instead of an int to avoid a loss of precision |
4510 | compiler warning from the output of strtoul. */ | |
4511 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
4512 | FILE *procfile; |
4513 | char **argv = NULL; | |
4514 | char buffer[MAXPATHLEN]; | |
4515 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
4516 | int cmdline_f = 1; | |
4517 | int cwd_f = 1; | |
4518 | int exe_f = 1; | |
4519 | int mappings_f = 0; | |
dba24537 AC |
4520 | int status_f = 0; |
4521 | int stat_f = 0; | |
4522 | int all = 0; | |
4523 | struct stat dummy; | |
4524 | ||
4525 | if (args) | |
4526 | { | |
4527 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
4528 | argv = gdb_buildargv (args); |
4529 | make_cleanup_freeargv (argv); | |
dba24537 AC |
4530 | } |
4531 | while (argv != NULL && *argv != NULL) | |
4532 | { | |
4533 | if (isdigit (argv[0][0])) | |
4534 | { | |
4535 | pid = strtoul (argv[0], NULL, 10); | |
4536 | } | |
4537 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
4538 | { | |
4539 | mappings_f = 1; | |
4540 | } | |
4541 | else if (strcmp (argv[0], "status") == 0) | |
4542 | { | |
4543 | status_f = 1; | |
4544 | } | |
4545 | else if (strcmp (argv[0], "stat") == 0) | |
4546 | { | |
4547 | stat_f = 1; | |
4548 | } | |
4549 | else if (strcmp (argv[0], "cmd") == 0) | |
4550 | { | |
4551 | cmdline_f = 1; | |
4552 | } | |
4553 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
4554 | { | |
4555 | exe_f = 1; | |
4556 | } | |
4557 | else if (strcmp (argv[0], "cwd") == 0) | |
4558 | { | |
4559 | cwd_f = 1; | |
4560 | } | |
4561 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
4562 | { | |
4563 | all = 1; | |
4564 | } | |
4565 | else | |
4566 | { | |
1777feb0 | 4567 | /* [...] (future options here). */ |
dba24537 AC |
4568 | } |
4569 | argv++; | |
4570 | } | |
4571 | if (pid == 0) | |
8a3fe4f8 | 4572 | error (_("No current process: you must name one.")); |
dba24537 | 4573 | |
89ecc4f5 | 4574 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4575 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4576 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4577 | |
89ecc4f5 | 4578 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
4579 | if (cmdline_f || all) |
4580 | { | |
89ecc4f5 | 4581 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4582 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4583 | { |
7c8a8b04 | 4584 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4585 | |
bf1d7d9c JB |
4586 | if (fgets (buffer, sizeof (buffer), procfile)) |
4587 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4588 | else | |
4589 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4590 | do_cleanups (cleanup); |
dba24537 AC |
4591 | } |
4592 | else | |
8a3fe4f8 | 4593 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4594 | } |
4595 | if (cwd_f || all) | |
4596 | { | |
89ecc4f5 | 4597 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4598 | memset (fname2, 0, sizeof (fname2)); |
4599 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4600 | printf_filtered ("cwd = '%s'\n", fname2); | |
4601 | else | |
8a3fe4f8 | 4602 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4603 | } |
4604 | if (exe_f || all) | |
4605 | { | |
89ecc4f5 | 4606 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4607 | memset (fname2, 0, sizeof (fname2)); |
4608 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4609 | printf_filtered ("exe = '%s'\n", fname2); | |
4610 | else | |
8a3fe4f8 | 4611 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4612 | } |
4613 | if (mappings_f || all) | |
4614 | { | |
89ecc4f5 | 4615 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4616 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4617 | { |
4618 | long long addr, endaddr, size, offset, inode; | |
4619 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4620 | struct cleanup *cleanup; |
dba24537 | 4621 | |
7c8a8b04 | 4622 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4623 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4624 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4625 | { |
4626 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4627 | "Start Addr", | |
4628 | " End Addr", | |
4629 | " Size", " Offset", "objfile"); | |
4630 | } | |
4631 | else | |
4632 | { | |
4633 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4634 | "Start Addr", | |
4635 | " End Addr", | |
4636 | " Size", " Offset", "objfile"); | |
4637 | } | |
4638 | ||
4639 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4640 | &offset, &device[0], &inode, &filename[0])) | |
4641 | { | |
4642 | size = endaddr - addr; | |
4643 | ||
4644 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4645 | calls here (and possibly above) should be abstracted | |
4646 | out into their own functions? Andrew suggests using | |
4647 | a generic local_address_string instead to print out | |
4648 | the addresses; that makes sense to me, too. */ | |
4649 | ||
a97b0ac8 | 4650 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4651 | { |
4652 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4653 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4654 | (unsigned long) endaddr, | |
4655 | (int) size, | |
4656 | (unsigned int) offset, | |
4657 | filename[0] ? filename : ""); | |
4658 | } | |
4659 | else | |
4660 | { | |
4661 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4662 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4663 | (unsigned long) endaddr, | |
4664 | (int) size, | |
4665 | (unsigned int) offset, | |
4666 | filename[0] ? filename : ""); | |
4667 | } | |
4668 | } | |
4669 | ||
7c8a8b04 | 4670 | do_cleanups (cleanup); |
dba24537 AC |
4671 | } |
4672 | else | |
8a3fe4f8 | 4673 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4674 | } |
4675 | if (status_f || all) | |
4676 | { | |
89ecc4f5 | 4677 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4678 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4679 | { |
7c8a8b04 | 4680 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4681 | |
dba24537 AC |
4682 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4683 | puts_filtered (buffer); | |
7c8a8b04 | 4684 | do_cleanups (cleanup); |
dba24537 AC |
4685 | } |
4686 | else | |
8a3fe4f8 | 4687 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4688 | } |
4689 | if (stat_f || all) | |
4690 | { | |
89ecc4f5 | 4691 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4692 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4693 | { |
4694 | int itmp; | |
4695 | char ctmp; | |
a25694b4 | 4696 | long ltmp; |
7c8a8b04 | 4697 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4698 | |
4699 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4700 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4701 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4702 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4703 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4704 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4705 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4706 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4707 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4708 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4709 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4710 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4711 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4712 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4713 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4714 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4715 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4716 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4717 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4718 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4719 | (unsigned long) ltmp); | |
4720 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4721 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4722 | (unsigned long) ltmp); | |
4723 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4724 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4725 | (unsigned long) ltmp); | |
4726 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4727 | printf_filtered (_("Major faults, children: %lu\n"), | |
4728 | (unsigned long) ltmp); | |
4729 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4730 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4731 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4732 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4733 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4734 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4735 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4736 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4737 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4738 | printf_filtered (_("jiffies remaining in current " |
4739 | "time slice: %ld\n"), ltmp); | |
a25694b4 AS |
4740 | if (fscanf (procfile, "%ld ", <mp) > 0) |
4741 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4742 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4743 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4744 | (unsigned long) ltmp); | |
4745 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4746 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4747 | (unsigned long) ltmp); | |
4748 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4749 | printf_filtered (_("start time (jiffies since " |
4750 | "system boot): %ld\n"), ltmp); | |
a25694b4 AS |
4751 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4752 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4753 | (unsigned long) ltmp); | |
4754 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3e43a32a MS |
4755 | printf_filtered (_("Resident set size: %lu\n"), |
4756 | (unsigned long) ltmp); | |
a25694b4 AS |
4757 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4758 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4759 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4760 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4761 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4762 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4763 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4764 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
3e43a32a MS |
4765 | #if 0 /* Don't know how architecture-dependent the rest is... |
4766 | Anyway the signal bitmap info is available from "status". */ | |
1777feb0 | 4767 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4768 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); |
1777feb0 | 4769 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 AS |
4770 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); |
4771 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4772 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
4773 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4774 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
4775 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4776 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
4777 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4778 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
1777feb0 | 4779 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4780 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); |
dba24537 | 4781 | #endif |
7c8a8b04 | 4782 | do_cleanups (cleanup); |
dba24537 AC |
4783 | } |
4784 | else | |
8a3fe4f8 | 4785 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4786 | } |
4787 | } | |
4788 | ||
10d6c8cd DJ |
4789 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
4790 | filesystem. Because we can use a single read() call for /proc, this | |
4791 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
4792 | but it doesn't support writes. */ | |
4793 | ||
4794 | static LONGEST | |
4795 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
4796 | const char *annex, gdb_byte *readbuf, | |
4797 | const gdb_byte *writebuf, | |
4798 | ULONGEST offset, LONGEST len) | |
dba24537 | 4799 | { |
10d6c8cd DJ |
4800 | LONGEST ret; |
4801 | int fd; | |
dba24537 AC |
4802 | char filename[64]; |
4803 | ||
10d6c8cd | 4804 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
4805 | return 0; |
4806 | ||
4807 | /* Don't bother for one word. */ | |
4808 | if (len < 3 * sizeof (long)) | |
4809 | return 0; | |
4810 | ||
4811 | /* We could keep this file open and cache it - possibly one per | |
4812 | thread. That requires some juggling, but is even faster. */ | |
4813 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
4814 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
4815 | if (fd == -1) | |
4816 | return 0; | |
4817 | ||
4818 | /* If pread64 is available, use it. It's faster if the kernel | |
4819 | supports it (only one syscall), and it's 64-bit safe even on | |
4820 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4821 | application). */ | |
4822 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4823 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4824 | #else |
10d6c8cd | 4825 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4826 | #endif |
4827 | ret = 0; | |
4828 | else | |
4829 | ret = len; | |
4830 | ||
4831 | close (fd); | |
4832 | return ret; | |
4833 | } | |
4834 | ||
efcbbd14 UW |
4835 | |
4836 | /* Enumerate spufs IDs for process PID. */ | |
4837 | static LONGEST | |
4838 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
4839 | { | |
4840 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
4841 | LONGEST pos = 0; | |
4842 | LONGEST written = 0; | |
4843 | char path[128]; | |
4844 | DIR *dir; | |
4845 | struct dirent *entry; | |
4846 | ||
4847 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4848 | dir = opendir (path); | |
4849 | if (!dir) | |
4850 | return -1; | |
4851 | ||
4852 | rewinddir (dir); | |
4853 | while ((entry = readdir (dir)) != NULL) | |
4854 | { | |
4855 | struct stat st; | |
4856 | struct statfs stfs; | |
4857 | int fd; | |
4858 | ||
4859 | fd = atoi (entry->d_name); | |
4860 | if (!fd) | |
4861 | continue; | |
4862 | ||
4863 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4864 | if (stat (path, &st) != 0) | |
4865 | continue; | |
4866 | if (!S_ISDIR (st.st_mode)) | |
4867 | continue; | |
4868 | ||
4869 | if (statfs (path, &stfs) != 0) | |
4870 | continue; | |
4871 | if (stfs.f_type != SPUFS_MAGIC) | |
4872 | continue; | |
4873 | ||
4874 | if (pos >= offset && pos + 4 <= offset + len) | |
4875 | { | |
4876 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
4877 | written += 4; | |
4878 | } | |
4879 | pos += 4; | |
4880 | } | |
4881 | ||
4882 | closedir (dir); | |
4883 | return written; | |
4884 | } | |
4885 | ||
4886 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4887 | object type, using the /proc file system. */ | |
4888 | static LONGEST | |
4889 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
4890 | const char *annex, gdb_byte *readbuf, | |
4891 | const gdb_byte *writebuf, | |
4892 | ULONGEST offset, LONGEST len) | |
4893 | { | |
4894 | char buf[128]; | |
4895 | int fd = 0; | |
4896 | int ret = -1; | |
4897 | int pid = PIDGET (inferior_ptid); | |
4898 | ||
4899 | if (!annex) | |
4900 | { | |
4901 | if (!readbuf) | |
4902 | return -1; | |
4903 | else | |
4904 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4905 | } | |
4906 | ||
4907 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
4908 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4909 | if (fd <= 0) | |
4910 | return -1; | |
4911 | ||
4912 | if (offset != 0 | |
4913 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4914 | { | |
4915 | close (fd); | |
4916 | return 0; | |
4917 | } | |
4918 | ||
4919 | if (writebuf) | |
4920 | ret = write (fd, writebuf, (size_t) len); | |
4921 | else if (readbuf) | |
4922 | ret = read (fd, readbuf, (size_t) len); | |
4923 | ||
4924 | close (fd); | |
4925 | return ret; | |
4926 | } | |
4927 | ||
4928 | ||
dba24537 AC |
4929 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
4930 | ||
4931 | static void | |
4932 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4933 | { | |
4934 | int len = strlen (line) - 1; | |
4935 | const char *p; | |
4936 | int signum; | |
4937 | ||
4938 | if (line[len] != '\n') | |
8a3fe4f8 | 4939 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4940 | |
4941 | p = line; | |
4942 | signum = len * 4; | |
4943 | while (len-- > 0) | |
4944 | { | |
4945 | int digit; | |
4946 | ||
4947 | if (*p >= '0' && *p <= '9') | |
4948 | digit = *p - '0'; | |
4949 | else if (*p >= 'a' && *p <= 'f') | |
4950 | digit = *p - 'a' + 10; | |
4951 | else | |
8a3fe4f8 | 4952 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4953 | |
4954 | signum -= 4; | |
4955 | ||
4956 | if (digit & 1) | |
4957 | sigaddset (sigs, signum + 1); | |
4958 | if (digit & 2) | |
4959 | sigaddset (sigs, signum + 2); | |
4960 | if (digit & 4) | |
4961 | sigaddset (sigs, signum + 3); | |
4962 | if (digit & 8) | |
4963 | sigaddset (sigs, signum + 4); | |
4964 | ||
4965 | p++; | |
4966 | } | |
4967 | } | |
4968 | ||
4969 | /* Find process PID's pending signals from /proc/pid/status and set | |
4970 | SIGS to match. */ | |
4971 | ||
4972 | void | |
3e43a32a MS |
4973 | linux_proc_pending_signals (int pid, sigset_t *pending, |
4974 | sigset_t *blocked, sigset_t *ignored) | |
dba24537 AC |
4975 | { |
4976 | FILE *procfile; | |
4977 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
7c8a8b04 | 4978 | struct cleanup *cleanup; |
dba24537 AC |
4979 | |
4980 | sigemptyset (pending); | |
4981 | sigemptyset (blocked); | |
4982 | sigemptyset (ignored); | |
4983 | sprintf (fname, "/proc/%d/status", pid); | |
4984 | procfile = fopen (fname, "r"); | |
4985 | if (procfile == NULL) | |
8a3fe4f8 | 4986 | error (_("Could not open %s"), fname); |
7c8a8b04 | 4987 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4988 | |
4989 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
4990 | { | |
4991 | /* Normal queued signals are on the SigPnd line in the status | |
4992 | file. However, 2.6 kernels also have a "shared" pending | |
4993 | queue for delivering signals to a thread group, so check for | |
4994 | a ShdPnd line also. | |
4995 | ||
4996 | Unfortunately some Red Hat kernels include the shared pending | |
4997 | queue but not the ShdPnd status field. */ | |
4998 | ||
4999 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
5000 | add_line_to_sigset (buffer + 8, pending); | |
5001 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
5002 | add_line_to_sigset (buffer + 8, pending); | |
5003 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
5004 | add_line_to_sigset (buffer + 8, blocked); | |
5005 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
5006 | add_line_to_sigset (buffer + 8, ignored); | |
5007 | } | |
5008 | ||
7c8a8b04 | 5009 | do_cleanups (cleanup); |
dba24537 AC |
5010 | } |
5011 | ||
07e059b5 VP |
5012 | static LONGEST |
5013 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
e0881a8e MS |
5014 | const char *annex, gdb_byte *readbuf, |
5015 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
07e059b5 VP |
5016 | { |
5017 | /* We make the process list snapshot when the object starts to be | |
5018 | read. */ | |
5019 | static const char *buf; | |
5020 | static LONGEST len_avail = -1; | |
5021 | static struct obstack obstack; | |
5022 | ||
5023 | DIR *dirp; | |
5024 | ||
5025 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
5026 | ||
a61408f8 SS |
5027 | if (!annex) |
5028 | { | |
5029 | if (offset == 0) | |
5030 | { | |
5031 | if (len_avail != -1 && len_avail != 0) | |
5032 | obstack_free (&obstack, NULL); | |
5033 | len_avail = 0; | |
5034 | buf = NULL; | |
5035 | obstack_init (&obstack); | |
5036 | obstack_grow_str (&obstack, "<osdata type=\"types\">\n"); | |
5037 | ||
3e43a32a | 5038 | obstack_xml_printf (&obstack, |
a61408f8 SS |
5039 | "<item>" |
5040 | "<column name=\"Type\">processes</column>" | |
3e43a32a MS |
5041 | "<column name=\"Description\">" |
5042 | "Listing of all processes</column>" | |
a61408f8 SS |
5043 | "</item>"); |
5044 | ||
5045 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
5046 | buf = obstack_finish (&obstack); | |
5047 | len_avail = strlen (buf); | |
5048 | } | |
5049 | ||
5050 | if (offset >= len_avail) | |
5051 | { | |
5052 | /* Done. Get rid of the obstack. */ | |
5053 | obstack_free (&obstack, NULL); | |
5054 | buf = NULL; | |
5055 | len_avail = 0; | |
5056 | return 0; | |
5057 | } | |
5058 | ||
5059 | if (len > len_avail - offset) | |
5060 | len = len_avail - offset; | |
5061 | memcpy (readbuf, buf + offset, len); | |
5062 | ||
5063 | return len; | |
5064 | } | |
5065 | ||
07e059b5 VP |
5066 | if (strcmp (annex, "processes") != 0) |
5067 | return 0; | |
5068 | ||
5069 | gdb_assert (readbuf && !writebuf); | |
5070 | ||
5071 | if (offset == 0) | |
5072 | { | |
5073 | if (len_avail != -1 && len_avail != 0) | |
e0881a8e | 5074 | obstack_free (&obstack, NULL); |
07e059b5 VP |
5075 | len_avail = 0; |
5076 | buf = NULL; | |
5077 | obstack_init (&obstack); | |
5078 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
5079 | ||
5080 | dirp = opendir ("/proc"); | |
5081 | if (dirp) | |
e0881a8e MS |
5082 | { |
5083 | struct dirent *dp; | |
5084 | ||
5085 | while ((dp = readdir (dirp)) != NULL) | |
5086 | { | |
5087 | struct stat statbuf; | |
5088 | char procentry[sizeof ("/proc/4294967295")]; | |
5089 | ||
5090 | if (!isdigit (dp->d_name[0]) | |
5091 | || NAMELEN (dp) > sizeof ("4294967295") - 1) | |
5092 | continue; | |
5093 | ||
5094 | sprintf (procentry, "/proc/%s", dp->d_name); | |
5095 | if (stat (procentry, &statbuf) == 0 | |
5096 | && S_ISDIR (statbuf.st_mode)) | |
5097 | { | |
5098 | char *pathname; | |
5099 | FILE *f; | |
5100 | char cmd[MAXPATHLEN + 1]; | |
5101 | struct passwd *entry; | |
5102 | ||
5103 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
5104 | entry = getpwuid (statbuf.st_uid); | |
5105 | ||
5106 | if ((f = fopen (pathname, "r")) != NULL) | |
5107 | { | |
5eee517d | 5108 | size_t length = fread (cmd, 1, sizeof (cmd) - 1, f); |
e0881a8e | 5109 | |
5eee517d | 5110 | if (length > 0) |
e0881a8e MS |
5111 | { |
5112 | int i; | |
5113 | ||
5eee517d | 5114 | for (i = 0; i < length; i++) |
e0881a8e MS |
5115 | if (cmd[i] == '\0') |
5116 | cmd[i] = ' '; | |
5eee517d | 5117 | cmd[length] = '\0'; |
e0881a8e MS |
5118 | |
5119 | obstack_xml_printf ( | |
5120 | &obstack, | |
5121 | "<item>" | |
5122 | "<column name=\"pid\">%s</column>" | |
5123 | "<column name=\"user\">%s</column>" | |
5124 | "<column name=\"command\">%s</column>" | |
5125 | "</item>", | |
5126 | dp->d_name, | |
5127 | entry ? entry->pw_name : "?", | |
5128 | cmd); | |
5129 | } | |
5130 | fclose (f); | |
5131 | } | |
5132 | ||
5133 | xfree (pathname); | |
5134 | } | |
5135 | } | |
5136 | ||
5137 | closedir (dirp); | |
5138 | } | |
07e059b5 VP |
5139 | |
5140 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
5141 | buf = obstack_finish (&obstack); | |
5142 | len_avail = strlen (buf); | |
5143 | } | |
5144 | ||
5145 | if (offset >= len_avail) | |
5146 | { | |
5147 | /* Done. Get rid of the obstack. */ | |
5148 | obstack_free (&obstack, NULL); | |
5149 | buf = NULL; | |
5150 | len_avail = 0; | |
5151 | return 0; | |
5152 | } | |
5153 | ||
5154 | if (len > len_avail - offset) | |
5155 | len = len_avail - offset; | |
5156 | memcpy (readbuf, buf + offset, len); | |
5157 | ||
5158 | return len; | |
5159 | } | |
5160 | ||
10d6c8cd DJ |
5161 | static LONGEST |
5162 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
5163 | const char *annex, gdb_byte *readbuf, | |
5164 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
5165 | { | |
5166 | LONGEST xfer; | |
5167 | ||
5168 | if (object == TARGET_OBJECT_AUXV) | |
9f2982ff | 5169 | return memory_xfer_auxv (ops, object, annex, readbuf, writebuf, |
10d6c8cd DJ |
5170 | offset, len); |
5171 | ||
07e059b5 VP |
5172 | if (object == TARGET_OBJECT_OSDATA) |
5173 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
5174 | offset, len); | |
5175 | ||
efcbbd14 UW |
5176 | if (object == TARGET_OBJECT_SPU) |
5177 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
5178 | offset, len); | |
5179 | ||
8f313923 JK |
5180 | /* GDB calculates all the addresses in possibly larget width of the address. |
5181 | Address width needs to be masked before its final use - either by | |
5182 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
5183 | ||
5184 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
5185 | ||
5186 | if (object == TARGET_OBJECT_MEMORY) | |
5187 | { | |
5188 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
5189 | ||
5190 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
5191 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
5192 | } | |
5193 | ||
10d6c8cd DJ |
5194 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
5195 | offset, len); | |
5196 | if (xfer != 0) | |
5197 | return xfer; | |
5198 | ||
5199 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
5200 | offset, len); | |
5201 | } | |
5202 | ||
e9efe249 | 5203 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
5204 | it with local methods. */ |
5205 | ||
910122bf UW |
5206 | static void |
5207 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 5208 | { |
6d8fd2b7 UW |
5209 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
5210 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; | |
5211 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; | |
a96d9b2e | 5212 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 5213 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 5214 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
5215 | t->to_post_attach = linux_child_post_attach; |
5216 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
5217 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
5218 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
5219 | ||
5220 | super_xfer_partial = t->to_xfer_partial; | |
5221 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
5222 | } |
5223 | ||
5224 | struct target_ops * | |
5225 | linux_target (void) | |
5226 | { | |
5227 | struct target_ops *t; | |
5228 | ||
5229 | t = inf_ptrace_target (); | |
5230 | linux_target_install_ops (t); | |
5231 | ||
5232 | return t; | |
5233 | } | |
5234 | ||
5235 | struct target_ops * | |
7714d83a | 5236 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
5237 | { |
5238 | struct target_ops *t; | |
5239 | ||
5240 | t = inf_ptrace_trad_target (register_u_offset); | |
5241 | linux_target_install_ops (t); | |
10d6c8cd | 5242 | |
10d6c8cd DJ |
5243 | return t; |
5244 | } | |
5245 | ||
b84876c2 PA |
5246 | /* target_is_async_p implementation. */ |
5247 | ||
5248 | static int | |
5249 | linux_nat_is_async_p (void) | |
5250 | { | |
5251 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5252 | it explicitly with the "set target-async" command. |
b84876c2 | 5253 | Someday, linux will always be async. */ |
c6ebd6cf | 5254 | if (!target_async_permitted) |
b84876c2 PA |
5255 | return 0; |
5256 | ||
d90e17a7 PA |
5257 | /* See target.h/target_async_mask. */ |
5258 | return linux_nat_async_mask_value; | |
b84876c2 PA |
5259 | } |
5260 | ||
5261 | /* target_can_async_p implementation. */ | |
5262 | ||
5263 | static int | |
5264 | linux_nat_can_async_p (void) | |
5265 | { | |
5266 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5267 | it explicitly with the "set target-async" command. |
b84876c2 | 5268 | Someday, linux will always be async. */ |
c6ebd6cf | 5269 | if (!target_async_permitted) |
b84876c2 PA |
5270 | return 0; |
5271 | ||
5272 | /* See target.h/target_async_mask. */ | |
5273 | return linux_nat_async_mask_value; | |
5274 | } | |
5275 | ||
9908b566 VP |
5276 | static int |
5277 | linux_nat_supports_non_stop (void) | |
5278 | { | |
5279 | return 1; | |
5280 | } | |
5281 | ||
d90e17a7 PA |
5282 | /* True if we want to support multi-process. To be removed when GDB |
5283 | supports multi-exec. */ | |
5284 | ||
2277426b | 5285 | int linux_multi_process = 1; |
d90e17a7 PA |
5286 | |
5287 | static int | |
5288 | linux_nat_supports_multi_process (void) | |
5289 | { | |
5290 | return linux_multi_process; | |
5291 | } | |
5292 | ||
b84876c2 PA |
5293 | /* target_async_mask implementation. */ |
5294 | ||
5295 | static int | |
7feb7d06 | 5296 | linux_nat_async_mask (int new_mask) |
b84876c2 | 5297 | { |
7feb7d06 | 5298 | int curr_mask = linux_nat_async_mask_value; |
b84876c2 | 5299 | |
7feb7d06 | 5300 | if (curr_mask != new_mask) |
b84876c2 | 5301 | { |
7feb7d06 | 5302 | if (new_mask == 0) |
b84876c2 PA |
5303 | { |
5304 | linux_nat_async (NULL, 0); | |
7feb7d06 | 5305 | linux_nat_async_mask_value = new_mask; |
b84876c2 PA |
5306 | } |
5307 | else | |
5308 | { | |
7feb7d06 | 5309 | linux_nat_async_mask_value = new_mask; |
84e46146 | 5310 | |
7feb7d06 PA |
5311 | /* If we're going out of async-mask in all-stop, then the |
5312 | inferior is stopped. The next resume will call | |
5313 | target_async. In non-stop, the target event source | |
5314 | should be always registered in the event loop. Do so | |
5315 | now. */ | |
5316 | if (non_stop) | |
5317 | linux_nat_async (inferior_event_handler, 0); | |
b84876c2 PA |
5318 | } |
5319 | } | |
5320 | ||
7feb7d06 | 5321 | return curr_mask; |
b84876c2 PA |
5322 | } |
5323 | ||
5324 | static int async_terminal_is_ours = 1; | |
5325 | ||
5326 | /* target_terminal_inferior implementation. */ | |
5327 | ||
5328 | static void | |
5329 | linux_nat_terminal_inferior (void) | |
5330 | { | |
5331 | if (!target_is_async_p ()) | |
5332 | { | |
5333 | /* Async mode is disabled. */ | |
5334 | terminal_inferior (); | |
5335 | return; | |
5336 | } | |
5337 | ||
b84876c2 PA |
5338 | terminal_inferior (); |
5339 | ||
d9d2d8b6 | 5340 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
5341 | if (!async_terminal_is_ours) |
5342 | return; | |
5343 | ||
5344 | delete_file_handler (input_fd); | |
5345 | async_terminal_is_ours = 0; | |
5346 | set_sigint_trap (); | |
5347 | } | |
5348 | ||
5349 | /* target_terminal_ours implementation. */ | |
5350 | ||
2c0b251b | 5351 | static void |
b84876c2 PA |
5352 | linux_nat_terminal_ours (void) |
5353 | { | |
5354 | if (!target_is_async_p ()) | |
5355 | { | |
5356 | /* Async mode is disabled. */ | |
5357 | terminal_ours (); | |
5358 | return; | |
5359 | } | |
5360 | ||
5361 | /* GDB should never give the terminal to the inferior if the | |
5362 | inferior is running in the background (run&, continue&, etc.), | |
5363 | but claiming it sure should. */ | |
5364 | terminal_ours (); | |
5365 | ||
b84876c2 PA |
5366 | if (async_terminal_is_ours) |
5367 | return; | |
5368 | ||
5369 | clear_sigint_trap (); | |
5370 | add_file_handler (input_fd, stdin_event_handler, 0); | |
5371 | async_terminal_is_ours = 1; | |
5372 | } | |
5373 | ||
5374 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
5375 | void *context); | |
5376 | static void *async_client_context; | |
5377 | ||
7feb7d06 PA |
5378 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5379 | so we notice when any child changes state, and notify the | |
5380 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
5381 | above to wait for the arrival of a SIGCHLD. */ | |
5382 | ||
b84876c2 | 5383 | static void |
7feb7d06 | 5384 | sigchld_handler (int signo) |
b84876c2 | 5385 | { |
7feb7d06 PA |
5386 | int old_errno = errno; |
5387 | ||
5388 | if (debug_linux_nat_async) | |
5389 | fprintf_unfiltered (gdb_stdlog, "sigchld\n"); | |
5390 | ||
5391 | if (signo == SIGCHLD | |
5392 | && linux_nat_event_pipe[0] != -1) | |
5393 | async_file_mark (); /* Let the event loop know that there are | |
5394 | events to handle. */ | |
5395 | ||
5396 | errno = old_errno; | |
5397 | } | |
5398 | ||
5399 | /* Callback registered with the target events file descriptor. */ | |
5400 | ||
5401 | static void | |
5402 | handle_target_event (int error, gdb_client_data client_data) | |
5403 | { | |
5404 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
5405 | } | |
5406 | ||
5407 | /* Create/destroy the target events pipe. Returns previous state. */ | |
5408 | ||
5409 | static int | |
5410 | linux_async_pipe (int enable) | |
5411 | { | |
5412 | int previous = (linux_nat_event_pipe[0] != -1); | |
5413 | ||
5414 | if (previous != enable) | |
5415 | { | |
5416 | sigset_t prev_mask; | |
5417 | ||
5418 | block_child_signals (&prev_mask); | |
5419 | ||
5420 | if (enable) | |
5421 | { | |
5422 | if (pipe (linux_nat_event_pipe) == -1) | |
5423 | internal_error (__FILE__, __LINE__, | |
5424 | "creating event pipe failed."); | |
5425 | ||
5426 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5427 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5428 | } | |
5429 | else | |
5430 | { | |
5431 | close (linux_nat_event_pipe[0]); | |
5432 | close (linux_nat_event_pipe[1]); | |
5433 | linux_nat_event_pipe[0] = -1; | |
5434 | linux_nat_event_pipe[1] = -1; | |
5435 | } | |
5436 | ||
5437 | restore_child_signals_mask (&prev_mask); | |
5438 | } | |
5439 | ||
5440 | return previous; | |
b84876c2 PA |
5441 | } |
5442 | ||
5443 | /* target_async implementation. */ | |
5444 | ||
5445 | static void | |
5446 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
5447 | void *context), void *context) | |
5448 | { | |
c6ebd6cf | 5449 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
5450 | internal_error (__FILE__, __LINE__, |
5451 | "Calling target_async when async is masked"); | |
5452 | ||
5453 | if (callback != NULL) | |
5454 | { | |
5455 | async_client_callback = callback; | |
5456 | async_client_context = context; | |
7feb7d06 PA |
5457 | if (!linux_async_pipe (1)) |
5458 | { | |
5459 | add_file_handler (linux_nat_event_pipe[0], | |
5460 | handle_target_event, NULL); | |
5461 | /* There may be pending events to handle. Tell the event loop | |
5462 | to poll them. */ | |
5463 | async_file_mark (); | |
5464 | } | |
b84876c2 PA |
5465 | } |
5466 | else | |
5467 | { | |
5468 | async_client_callback = callback; | |
5469 | async_client_context = context; | |
b84876c2 | 5470 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 5471 | linux_async_pipe (0); |
b84876c2 PA |
5472 | } |
5473 | return; | |
5474 | } | |
5475 | ||
252fbfc8 PA |
5476 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
5477 | event came out. */ | |
5478 | ||
4c28f408 | 5479 | static int |
252fbfc8 | 5480 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 5481 | { |
d90e17a7 | 5482 | if (!lwp->stopped) |
252fbfc8 | 5483 | { |
d90e17a7 | 5484 | ptid_t ptid = lwp->ptid; |
252fbfc8 | 5485 | |
d90e17a7 PA |
5486 | if (debug_linux_nat) |
5487 | fprintf_unfiltered (gdb_stdlog, | |
5488 | "LNSL: running -> suspending %s\n", | |
5489 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 5490 | |
252fbfc8 | 5491 | |
d90e17a7 PA |
5492 | stop_callback (lwp, NULL); |
5493 | stop_wait_callback (lwp, NULL); | |
252fbfc8 | 5494 | |
d90e17a7 PA |
5495 | /* If the lwp exits while we try to stop it, there's nothing |
5496 | else to do. */ | |
5497 | lwp = find_lwp_pid (ptid); | |
5498 | if (lwp == NULL) | |
5499 | return 0; | |
252fbfc8 | 5500 | |
d90e17a7 PA |
5501 | /* If we didn't collect any signal other than SIGSTOP while |
5502 | stopping the LWP, push a SIGNAL_0 event. In either case, the | |
5503 | event-loop will end up calling target_wait which will collect | |
5504 | these. */ | |
5505 | if (lwp->status == 0) | |
5506 | lwp->status = W_STOPCODE (0); | |
5507 | async_file_mark (); | |
5508 | } | |
5509 | else | |
5510 | { | |
5511 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 5512 | |
d90e17a7 PA |
5513 | if (debug_linux_nat) |
5514 | { | |
e09875d4 | 5515 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
3e43a32a MS |
5516 | fprintf_unfiltered (gdb_stdlog, |
5517 | "LNSL: already stopped/stop_requested %s\n", | |
d90e17a7 PA |
5518 | target_pid_to_str (lwp->ptid)); |
5519 | else | |
3e43a32a MS |
5520 | fprintf_unfiltered (gdb_stdlog, |
5521 | "LNSL: already stopped/no " | |
5522 | "stop_requested yet %s\n", | |
d90e17a7 | 5523 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
5524 | } |
5525 | } | |
4c28f408 PA |
5526 | return 0; |
5527 | } | |
5528 | ||
5529 | static void | |
5530 | linux_nat_stop (ptid_t ptid) | |
5531 | { | |
5532 | if (non_stop) | |
d90e17a7 | 5533 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
5534 | else |
5535 | linux_ops->to_stop (ptid); | |
5536 | } | |
5537 | ||
d90e17a7 PA |
5538 | static void |
5539 | linux_nat_close (int quitting) | |
5540 | { | |
5541 | /* Unregister from the event loop. */ | |
5542 | if (target_is_async_p ()) | |
5543 | target_async (NULL, 0); | |
5544 | ||
5545 | /* Reset the async_masking. */ | |
5546 | linux_nat_async_mask_value = 1; | |
5547 | ||
5548 | if (linux_ops->to_close) | |
5549 | linux_ops->to_close (quitting); | |
5550 | } | |
5551 | ||
c0694254 PA |
5552 | /* When requests are passed down from the linux-nat layer to the |
5553 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
5554 | used. The address space pointer is stored in the inferior object, | |
5555 | but the common code that is passed such ptid can't tell whether | |
5556 | lwpid is a "main" process id or not (it assumes so). We reverse | |
5557 | look up the "main" process id from the lwp here. */ | |
5558 | ||
5559 | struct address_space * | |
5560 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) | |
5561 | { | |
5562 | struct lwp_info *lwp; | |
5563 | struct inferior *inf; | |
5564 | int pid; | |
5565 | ||
5566 | pid = GET_LWP (ptid); | |
5567 | if (GET_LWP (ptid) == 0) | |
5568 | { | |
5569 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
5570 | tgid. */ | |
5571 | lwp = find_lwp_pid (ptid); | |
5572 | pid = GET_PID (lwp->ptid); | |
5573 | } | |
5574 | else | |
5575 | { | |
5576 | /* A (pid,lwpid,0) ptid. */ | |
5577 | pid = GET_PID (ptid); | |
5578 | } | |
5579 | ||
5580 | inf = find_inferior_pid (pid); | |
5581 | gdb_assert (inf != NULL); | |
5582 | return inf->aspace; | |
5583 | } | |
5584 | ||
dc146f7c VP |
5585 | int |
5586 | linux_nat_core_of_thread_1 (ptid_t ptid) | |
5587 | { | |
5588 | struct cleanup *back_to; | |
5589 | char *filename; | |
5590 | FILE *f; | |
5591 | char *content = NULL; | |
5592 | char *p; | |
5593 | char *ts = 0; | |
5594 | int content_read = 0; | |
5595 | int i; | |
5596 | int core; | |
5597 | ||
5598 | filename = xstrprintf ("/proc/%d/task/%ld/stat", | |
5599 | GET_PID (ptid), GET_LWP (ptid)); | |
5600 | back_to = make_cleanup (xfree, filename); | |
5601 | ||
5602 | f = fopen (filename, "r"); | |
5603 | if (!f) | |
5604 | { | |
5605 | do_cleanups (back_to); | |
5606 | return -1; | |
5607 | } | |
5608 | ||
5609 | make_cleanup_fclose (f); | |
5610 | ||
5611 | for (;;) | |
5612 | { | |
5613 | int n; | |
e0881a8e | 5614 | |
dc146f7c VP |
5615 | content = xrealloc (content, content_read + 1024); |
5616 | n = fread (content + content_read, 1, 1024, f); | |
5617 | content_read += n; | |
5618 | if (n < 1024) | |
5619 | { | |
5620 | content[content_read] = '\0'; | |
5621 | break; | |
5622 | } | |
5623 | } | |
5624 | ||
5625 | make_cleanup (xfree, content); | |
5626 | ||
5627 | p = strchr (content, '('); | |
ca2a87a0 JK |
5628 | |
5629 | /* Skip ")". */ | |
5630 | if (p != NULL) | |
5631 | p = strchr (p, ')'); | |
5632 | if (p != NULL) | |
5633 | p++; | |
dc146f7c VP |
5634 | |
5635 | /* If the first field after program name has index 0, then core number is | |
5636 | the field with index 36. There's no constant for that anywhere. */ | |
ca2a87a0 JK |
5637 | if (p != NULL) |
5638 | p = strtok_r (p, " ", &ts); | |
5639 | for (i = 0; p != NULL && i != 36; ++i) | |
dc146f7c VP |
5640 | p = strtok_r (NULL, " ", &ts); |
5641 | ||
ca2a87a0 | 5642 | if (p == NULL || sscanf (p, "%d", &core) == 0) |
dc146f7c VP |
5643 | core = -1; |
5644 | ||
5645 | do_cleanups (back_to); | |
5646 | ||
5647 | return core; | |
5648 | } | |
5649 | ||
5650 | /* Return the cached value of the processor core for thread PTID. */ | |
5651 | ||
5652 | int | |
5653 | linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid) | |
5654 | { | |
5655 | struct lwp_info *info = find_lwp_pid (ptid); | |
e0881a8e | 5656 | |
dc146f7c VP |
5657 | if (info) |
5658 | return info->core; | |
5659 | return -1; | |
5660 | } | |
5661 | ||
f973ed9c DJ |
5662 | void |
5663 | linux_nat_add_target (struct target_ops *t) | |
5664 | { | |
f973ed9c DJ |
5665 | /* Save the provided single-threaded target. We save this in a separate |
5666 | variable because another target we've inherited from (e.g. inf-ptrace) | |
5667 | may have saved a pointer to T; we want to use it for the final | |
5668 | process stratum target. */ | |
5669 | linux_ops_saved = *t; | |
5670 | linux_ops = &linux_ops_saved; | |
5671 | ||
5672 | /* Override some methods for multithreading. */ | |
b84876c2 | 5673 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
5674 | t->to_attach = linux_nat_attach; |
5675 | t->to_detach = linux_nat_detach; | |
5676 | t->to_resume = linux_nat_resume; | |
5677 | t->to_wait = linux_nat_wait; | |
5678 | t->to_xfer_partial = linux_nat_xfer_partial; | |
5679 | t->to_kill = linux_nat_kill; | |
5680 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
5681 | t->to_thread_alive = linux_nat_thread_alive; | |
5682 | t->to_pid_to_str = linux_nat_pid_to_str; | |
4694da01 | 5683 | t->to_thread_name = linux_nat_thread_name; |
f973ed9c | 5684 | t->to_has_thread_control = tc_schedlock; |
c0694254 | 5685 | t->to_thread_address_space = linux_nat_thread_address_space; |
ebec9a0f PA |
5686 | t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint; |
5687 | t->to_stopped_data_address = linux_nat_stopped_data_address; | |
f973ed9c | 5688 | |
b84876c2 PA |
5689 | t->to_can_async_p = linux_nat_can_async_p; |
5690 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5691 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
5692 | t->to_async = linux_nat_async; |
5693 | t->to_async_mask = linux_nat_async_mask; | |
5694 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
5695 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5696 | t->to_close = linux_nat_close; |
b84876c2 | 5697 | |
4c28f408 PA |
5698 | /* Methods for non-stop support. */ |
5699 | t->to_stop = linux_nat_stop; | |
5700 | ||
d90e17a7 PA |
5701 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5702 | ||
dc146f7c VP |
5703 | t->to_core_of_thread = linux_nat_core_of_thread; |
5704 | ||
f973ed9c DJ |
5705 | /* We don't change the stratum; this target will sit at |
5706 | process_stratum and thread_db will set at thread_stratum. This | |
5707 | is a little strange, since this is a multi-threaded-capable | |
5708 | target, but we want to be on the stack below thread_db, and we | |
5709 | also want to be used for single-threaded processes. */ | |
5710 | ||
5711 | add_target (t); | |
f973ed9c DJ |
5712 | } |
5713 | ||
9f0bdab8 DJ |
5714 | /* Register a method to call whenever a new thread is attached. */ |
5715 | void | |
5716 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5717 | { | |
5718 | /* Save the pointer. We only support a single registered instance | |
5719 | of the GNU/Linux native target, so we do not need to map this to | |
5720 | T. */ | |
5721 | linux_nat_new_thread = new_thread; | |
5722 | } | |
5723 | ||
5b009018 PA |
5724 | /* Register a method that converts a siginfo object between the layout |
5725 | that ptrace returns, and the layout in the architecture of the | |
5726 | inferior. */ | |
5727 | void | |
5728 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5729 | int (*siginfo_fixup) (struct siginfo *, | |
5730 | gdb_byte *, | |
5731 | int)) | |
5732 | { | |
5733 | /* Save the pointer. */ | |
5734 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5735 | } | |
5736 | ||
9f0bdab8 DJ |
5737 | /* Return the saved siginfo associated with PTID. */ |
5738 | struct siginfo * | |
5739 | linux_nat_get_siginfo (ptid_t ptid) | |
5740 | { | |
5741 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5742 | ||
5743 | gdb_assert (lp != NULL); | |
5744 | ||
5745 | return &lp->siginfo; | |
5746 | } | |
5747 | ||
2c0b251b PA |
5748 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5749 | extern initialize_file_ftype _initialize_linux_nat; | |
5750 | ||
d6b0e80f AC |
5751 | void |
5752 | _initialize_linux_nat (void) | |
5753 | { | |
1bedd215 AC |
5754 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
5755 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
5756 | Specify any process id, or use the program being debugged by default.\n\ |
5757 | Specify any of the following keywords for detailed info:\n\ | |
5758 | mappings -- list of mapped memory regions.\n\ | |
5759 | stat -- list a bunch of random process info.\n\ | |
5760 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 5761 | all -- list all available /proc info.")); |
d6b0e80f | 5762 | |
b84876c2 PA |
5763 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5764 | &debug_linux_nat, _("\ | |
5765 | Set debugging of GNU/Linux lwp module."), _("\ | |
5766 | Show debugging of GNU/Linux lwp module."), _("\ | |
5767 | Enables printf debugging output."), | |
5768 | NULL, | |
5769 | show_debug_linux_nat, | |
5770 | &setdebuglist, &showdebuglist); | |
5771 | ||
5772 | add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance, | |
5773 | &debug_linux_nat_async, _("\ | |
5774 | Set debugging of GNU/Linux async lwp module."), _("\ | |
5775 | Show debugging of GNU/Linux async lwp module."), _("\ | |
5776 | Enables printf debugging output."), | |
5777 | NULL, | |
5778 | show_debug_linux_nat_async, | |
5779 | &setdebuglist, &showdebuglist); | |
5780 | ||
b84876c2 | 5781 | /* Save this mask as the default. */ |
d6b0e80f AC |
5782 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5783 | ||
7feb7d06 PA |
5784 | /* Install a SIGCHLD handler. */ |
5785 | sigchld_action.sa_handler = sigchld_handler; | |
5786 | sigemptyset (&sigchld_action.sa_mask); | |
5787 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5788 | |
5789 | /* Make it the default. */ | |
7feb7d06 | 5790 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5791 | |
5792 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5793 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5794 | sigdelset (&suspend_mask, SIGCHLD); | |
5795 | ||
7feb7d06 | 5796 | sigemptyset (&blocked_mask); |
10568435 JK |
5797 | |
5798 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
5799 | &disable_randomization, _("\ | |
5800 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
5801 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
5802 | When this mode is on (which is the default), randomization of the virtual\n\ | |
5803 | address space is disabled. Standalone programs run with the randomization\n\ | |
5804 | enabled by default on some platforms."), | |
5805 | &set_disable_randomization, | |
5806 | &show_disable_randomization, | |
5807 | &setlist, &showlist); | |
d6b0e80f AC |
5808 | } |
5809 | \f | |
5810 | ||
5811 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5812 | the GNU/Linux Threads library and therefore doesn't really belong | |
5813 | here. */ | |
5814 | ||
5815 | /* Read variable NAME in the target and return its value if found. | |
5816 | Otherwise return zero. It is assumed that the type of the variable | |
5817 | is `int'. */ | |
5818 | ||
5819 | static int | |
5820 | get_signo (const char *name) | |
5821 | { | |
5822 | struct minimal_symbol *ms; | |
5823 | int signo; | |
5824 | ||
5825 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5826 | if (ms == NULL) | |
5827 | return 0; | |
5828 | ||
8e70166d | 5829 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5830 | sizeof (signo)) != 0) |
5831 | return 0; | |
5832 | ||
5833 | return signo; | |
5834 | } | |
5835 | ||
5836 | /* Return the set of signals used by the threads library in *SET. */ | |
5837 | ||
5838 | void | |
5839 | lin_thread_get_thread_signals (sigset_t *set) | |
5840 | { | |
5841 | struct sigaction action; | |
5842 | int restart, cancel; | |
5843 | ||
b84876c2 | 5844 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5845 | sigemptyset (set); |
5846 | ||
5847 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5848 | cancel = get_signo ("__pthread_sig_cancel"); |
5849 | ||
5850 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5851 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5852 | not provide any way for the debugger to query the signal numbers - | |
5853 | fortunately they don't change! */ | |
5854 | ||
d6b0e80f | 5855 | if (restart == 0) |
17fbb0bd | 5856 | restart = __SIGRTMIN; |
d6b0e80f | 5857 | |
d6b0e80f | 5858 | if (cancel == 0) |
17fbb0bd | 5859 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5860 | |
5861 | sigaddset (set, restart); | |
5862 | sigaddset (set, cancel); | |
5863 | ||
5864 | /* The GNU/Linux Threads library makes terminating threads send a | |
5865 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
5866 | those (to prevent them from terminating GDB itself, which is | |
5867 | likely to be their default action) and treat them the same way as | |
5868 | SIGCHLD. */ | |
5869 | ||
5870 | action.sa_handler = sigchld_handler; | |
5871 | sigemptyset (&action.sa_mask); | |
58aecb61 | 5872 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
5873 | sigaction (cancel, &action, NULL); |
5874 | ||
5875 | /* We block the "cancel" signal throughout this code ... */ | |
5876 | sigaddset (&blocked_mask, cancel); | |
5877 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
5878 | ||
5879 | /* ... except during a sigsuspend. */ | |
5880 | sigdelset (&suspend_mask, cancel); | |
5881 | } |