Commit | Line | Data |
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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
4c38e0a4 | 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
e26af52f | 4 | Free Software Foundation, Inc. |
3993f6b1 DJ |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
3993f6b1 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
3993f6b1 DJ |
20 | |
21 | #include "defs.h" | |
22 | #include "inferior.h" | |
23 | #include "target.h" | |
d6b0e80f | 24 | #include "gdb_string.h" |
3993f6b1 | 25 | #include "gdb_wait.h" |
d6b0e80f AC |
26 | #include "gdb_assert.h" |
27 | #ifdef HAVE_TKILL_SYSCALL | |
28 | #include <unistd.h> | |
29 | #include <sys/syscall.h> | |
30 | #endif | |
3993f6b1 | 31 | #include <sys/ptrace.h> |
0274a8ce | 32 | #include "linux-nat.h" |
ac264b3b | 33 | #include "linux-fork.h" |
d6b0e80f AC |
34 | #include "gdbthread.h" |
35 | #include "gdbcmd.h" | |
36 | #include "regcache.h" | |
4f844a66 | 37 | #include "regset.h" |
10d6c8cd DJ |
38 | #include "inf-ptrace.h" |
39 | #include "auxv.h" | |
dba24537 AC |
40 | #include <sys/param.h> /* for MAXPATHLEN */ |
41 | #include <sys/procfs.h> /* for elf_gregset etc. */ | |
42 | #include "elf-bfd.h" /* for elfcore_write_* */ | |
43 | #include "gregset.h" /* for gregset */ | |
44 | #include "gdbcore.h" /* for get_exec_file */ | |
45 | #include <ctype.h> /* for isdigit */ | |
46 | #include "gdbthread.h" /* for struct thread_info etc. */ | |
47 | #include "gdb_stat.h" /* for struct stat */ | |
48 | #include <fcntl.h> /* for O_RDONLY */ | |
b84876c2 PA |
49 | #include "inf-loop.h" |
50 | #include "event-loop.h" | |
51 | #include "event-top.h" | |
07e059b5 VP |
52 | #include <pwd.h> |
53 | #include <sys/types.h> | |
54 | #include "gdb_dirent.h" | |
55 | #include "xml-support.h" | |
191c4426 | 56 | #include "terminal.h" |
efcbbd14 | 57 | #include <sys/vfs.h> |
6c95b8df | 58 | #include "solib.h" |
efcbbd14 UW |
59 | |
60 | #ifndef SPUFS_MAGIC | |
61 | #define SPUFS_MAGIC 0x23c9b64e | |
62 | #endif | |
dba24537 | 63 | |
10568435 JK |
64 | #ifdef HAVE_PERSONALITY |
65 | # include <sys/personality.h> | |
66 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
67 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
68 | # endif | |
69 | #endif /* HAVE_PERSONALITY */ | |
70 | ||
8a77dff3 VP |
71 | /* This comment documents high-level logic of this file. |
72 | ||
73 | Waiting for events in sync mode | |
74 | =============================== | |
75 | ||
76 | When waiting for an event in a specific thread, we just use waitpid, passing | |
77 | the specific pid, and not passing WNOHANG. | |
78 | ||
79 | When waiting for an event in all threads, waitpid is not quite good. Prior to | |
80 | version 2.4, Linux can either wait for event in main thread, or in secondary | |
81 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might | |
82 | miss an event. The solution is to use non-blocking waitpid, together with | |
83 | sigsuspend. First, we use non-blocking waitpid to get an event in the main | |
84 | process, if any. Second, we use non-blocking waitpid with the __WCLONED | |
85 | flag to check for events in cloned processes. If nothing is found, we use | |
86 | sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something | |
87 | happened to a child process -- and SIGCHLD will be delivered both for events | |
88 | in main debugged process and in cloned processes. As soon as we know there's | |
89 | an event, we get back to calling nonblocking waitpid with and without __WCLONED. | |
90 | ||
91 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
92 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's | |
93 | blocked, the signal becomes pending and sigsuspend immediately | |
94 | notices it and returns. | |
95 | ||
96 | Waiting for events in async mode | |
97 | ================================ | |
98 | ||
7feb7d06 PA |
99 | In async mode, GDB should always be ready to handle both user input |
100 | and target events, so neither blocking waitpid nor sigsuspend are | |
101 | viable options. Instead, we should asynchronously notify the GDB main | |
102 | event loop whenever there's an unprocessed event from the target. We | |
103 | detect asynchronous target events by handling SIGCHLD signals. To | |
104 | notify the event loop about target events, the self-pipe trick is used | |
105 | --- a pipe is registered as waitable event source in the event loop, | |
106 | the event loop select/poll's on the read end of this pipe (as well on | |
107 | other event sources, e.g., stdin), and the SIGCHLD handler writes a | |
108 | byte to this pipe. This is more portable than relying on | |
109 | pselect/ppoll, since on kernels that lack those syscalls, libc | |
110 | emulates them with select/poll+sigprocmask, and that is racy | |
111 | (a.k.a. plain broken). | |
112 | ||
113 | Obviously, if we fail to notify the event loop if there's a target | |
114 | event, it's bad. OTOH, if we notify the event loop when there's no | |
115 | event from the target, linux_nat_wait will detect that there's no real | |
116 | event to report, and return event of type TARGET_WAITKIND_IGNORE. | |
117 | This is mostly harmless, but it will waste time and is better avoided. | |
118 | ||
119 | The main design point is that every time GDB is outside linux-nat.c, | |
120 | we have a SIGCHLD handler installed that is called when something | |
121 | happens to the target and notifies the GDB event loop. Whenever GDB | |
122 | core decides to handle the event, and calls into linux-nat.c, we | |
123 | process things as in sync mode, except that the we never block in | |
124 | sigsuspend. | |
125 | ||
126 | While processing an event, we may end up momentarily blocked in | |
127 | waitpid calls. Those waitpid calls, while blocking, are guarantied to | |
128 | return quickly. E.g., in all-stop mode, before reporting to the core | |
129 | that an LWP hit a breakpoint, all LWPs are stopped by sending them | |
130 | SIGSTOP, and synchronously waiting for the SIGSTOP to be reported. | |
131 | Note that this is different from blocking indefinitely waiting for the | |
132 | next event --- here, we're already handling an event. | |
8a77dff3 VP |
133 | |
134 | Use of signals | |
135 | ============== | |
136 | ||
137 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
138 | signal is not entirely significant; we just need for a signal to be delivered, | |
139 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
140 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
141 | be queued once; we do not keep track of other sources of SIGSTOP. | |
142 | ||
143 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
144 | use them, because they have special behavior when the signal is generated - | |
145 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
146 | kills the entire thread group. | |
147 | ||
148 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
149 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
150 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
151 | ||
152 | We could use a real-time signal instead. This would solve those problems; we | |
153 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
154 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
155 | generates it, and there are races with trying to find a signal that is not | |
156 | blocked. */ | |
a0ef4274 | 157 | |
dba24537 AC |
158 | #ifndef O_LARGEFILE |
159 | #define O_LARGEFILE 0 | |
160 | #endif | |
0274a8ce | 161 | |
3993f6b1 DJ |
162 | /* If the system headers did not provide the constants, hard-code the normal |
163 | values. */ | |
164 | #ifndef PTRACE_EVENT_FORK | |
165 | ||
166 | #define PTRACE_SETOPTIONS 0x4200 | |
167 | #define PTRACE_GETEVENTMSG 0x4201 | |
168 | ||
169 | /* options set using PTRACE_SETOPTIONS */ | |
170 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
171 | #define PTRACE_O_TRACEFORK 0x00000002 | |
172 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
173 | #define PTRACE_O_TRACECLONE 0x00000008 | |
174 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
9016a515 DJ |
175 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
176 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
3993f6b1 DJ |
177 | |
178 | /* Wait extended result codes for the above trace options. */ | |
179 | #define PTRACE_EVENT_FORK 1 | |
180 | #define PTRACE_EVENT_VFORK 2 | |
181 | #define PTRACE_EVENT_CLONE 3 | |
182 | #define PTRACE_EVENT_EXEC 4 | |
c874c7fc | 183 | #define PTRACE_EVENT_VFORK_DONE 5 |
9016a515 | 184 | #define PTRACE_EVENT_EXIT 6 |
3993f6b1 DJ |
185 | |
186 | #endif /* PTRACE_EVENT_FORK */ | |
187 | ||
ca2163eb PA |
188 | /* Unlike other extended result codes, WSTOPSIG (status) on |
189 | PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but | |
190 | instead SIGTRAP with bit 7 set. */ | |
191 | #define SYSCALL_SIGTRAP (SIGTRAP | 0x80) | |
192 | ||
3993f6b1 DJ |
193 | /* We can't always assume that this flag is available, but all systems |
194 | with the ptrace event handlers also have __WALL, so it's safe to use | |
195 | here. */ | |
196 | #ifndef __WALL | |
197 | #define __WALL 0x40000000 /* Wait for any child. */ | |
198 | #endif | |
199 | ||
02d3ff8c | 200 | #ifndef PTRACE_GETSIGINFO |
1ef18d08 PA |
201 | # define PTRACE_GETSIGINFO 0x4202 |
202 | # define PTRACE_SETSIGINFO 0x4203 | |
02d3ff8c UW |
203 | #endif |
204 | ||
10d6c8cd DJ |
205 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
206 | the use of the multi-threaded target. */ | |
207 | static struct target_ops *linux_ops; | |
f973ed9c | 208 | static struct target_ops linux_ops_saved; |
10d6c8cd | 209 | |
9f0bdab8 DJ |
210 | /* The method to call, if any, when a new thread is attached. */ |
211 | static void (*linux_nat_new_thread) (ptid_t); | |
212 | ||
5b009018 PA |
213 | /* The method to call, if any, when the siginfo object needs to be |
214 | converted between the layout returned by ptrace, and the layout in | |
215 | the architecture of the inferior. */ | |
216 | static int (*linux_nat_siginfo_fixup) (struct siginfo *, | |
217 | gdb_byte *, | |
218 | int); | |
219 | ||
ac264b3b MS |
220 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
221 | Called by our to_xfer_partial. */ | |
222 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
223 | enum target_object, | |
224 | const char *, gdb_byte *, | |
225 | const gdb_byte *, | |
10d6c8cd DJ |
226 | ULONGEST, LONGEST); |
227 | ||
d6b0e80f | 228 | static int debug_linux_nat; |
920d2a44 AC |
229 | static void |
230 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
231 | struct cmd_list_element *c, const char *value) | |
232 | { | |
233 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
234 | value); | |
235 | } | |
d6b0e80f | 236 | |
b84876c2 PA |
237 | static int debug_linux_nat_async = 0; |
238 | static void | |
239 | show_debug_linux_nat_async (struct ui_file *file, int from_tty, | |
240 | struct cmd_list_element *c, const char *value) | |
241 | { | |
242 | fprintf_filtered (file, _("Debugging of GNU/Linux async lwp module is %s.\n"), | |
243 | value); | |
244 | } | |
245 | ||
10568435 JK |
246 | static int disable_randomization = 1; |
247 | ||
248 | static void | |
249 | show_disable_randomization (struct ui_file *file, int from_tty, | |
250 | struct cmd_list_element *c, const char *value) | |
251 | { | |
252 | #ifdef HAVE_PERSONALITY | |
253 | fprintf_filtered (file, _("\ | |
254 | Disabling randomization of debuggee's virtual address space is %s.\n"), | |
255 | value); | |
256 | #else /* !HAVE_PERSONALITY */ | |
257 | fputs_filtered (_("\ | |
258 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
259 | this platform.\n"), file); | |
260 | #endif /* !HAVE_PERSONALITY */ | |
261 | } | |
262 | ||
263 | static void | |
264 | set_disable_randomization (char *args, int from_tty, struct cmd_list_element *c) | |
265 | { | |
266 | #ifndef HAVE_PERSONALITY | |
267 | error (_("\ | |
268 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
269 | this platform.")); | |
270 | #endif /* !HAVE_PERSONALITY */ | |
271 | } | |
272 | ||
9016a515 DJ |
273 | static int linux_parent_pid; |
274 | ||
ae087d01 DJ |
275 | struct simple_pid_list |
276 | { | |
277 | int pid; | |
3d799a95 | 278 | int status; |
ae087d01 DJ |
279 | struct simple_pid_list *next; |
280 | }; | |
281 | struct simple_pid_list *stopped_pids; | |
282 | ||
3993f6b1 DJ |
283 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
284 | can not be used, 1 if it can. */ | |
285 | ||
286 | static int linux_supports_tracefork_flag = -1; | |
287 | ||
a96d9b2e SDJ |
288 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACESYSGOOD |
289 | can not be used, 1 if it can. */ | |
290 | ||
291 | static int linux_supports_tracesysgood_flag = -1; | |
292 | ||
9016a515 DJ |
293 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
294 | PTRACE_O_TRACEVFORKDONE. */ | |
295 | ||
296 | static int linux_supports_tracevforkdone_flag = -1; | |
297 | ||
b84876c2 PA |
298 | /* Async mode support */ |
299 | ||
b84876c2 PA |
300 | /* Zero if the async mode, although enabled, is masked, which means |
301 | linux_nat_wait should behave as if async mode was off. */ | |
302 | static int linux_nat_async_mask_value = 1; | |
303 | ||
a96d9b2e SDJ |
304 | /* Stores the current used ptrace() options. */ |
305 | static int current_ptrace_options = 0; | |
306 | ||
b84876c2 PA |
307 | /* The read/write ends of the pipe registered as waitable file in the |
308 | event loop. */ | |
309 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
310 | ||
7feb7d06 | 311 | /* Flush the event pipe. */ |
b84876c2 | 312 | |
7feb7d06 PA |
313 | static void |
314 | async_file_flush (void) | |
b84876c2 | 315 | { |
7feb7d06 PA |
316 | int ret; |
317 | char buf; | |
b84876c2 | 318 | |
7feb7d06 | 319 | do |
b84876c2 | 320 | { |
7feb7d06 | 321 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 322 | } |
7feb7d06 | 323 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
324 | } |
325 | ||
7feb7d06 PA |
326 | /* Put something (anything, doesn't matter what, or how much) in event |
327 | pipe, so that the select/poll in the event-loop realizes we have | |
328 | something to process. */ | |
252fbfc8 | 329 | |
b84876c2 | 330 | static void |
7feb7d06 | 331 | async_file_mark (void) |
b84876c2 | 332 | { |
7feb7d06 | 333 | int ret; |
b84876c2 | 334 | |
7feb7d06 PA |
335 | /* It doesn't really matter what the pipe contains, as long we end |
336 | up with something in it. Might as well flush the previous | |
337 | left-overs. */ | |
338 | async_file_flush (); | |
b84876c2 | 339 | |
7feb7d06 | 340 | do |
b84876c2 | 341 | { |
7feb7d06 | 342 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 343 | } |
7feb7d06 | 344 | while (ret == -1 && errno == EINTR); |
b84876c2 | 345 | |
7feb7d06 PA |
346 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
347 | be awakened anyway. */ | |
b84876c2 PA |
348 | } |
349 | ||
7feb7d06 PA |
350 | static void linux_nat_async (void (*callback) |
351 | (enum inferior_event_type event_type, void *context), | |
352 | void *context); | |
353 | static int linux_nat_async_mask (int mask); | |
354 | static int kill_lwp (int lwpid, int signo); | |
355 | ||
356 | static int stop_callback (struct lwp_info *lp, void *data); | |
357 | ||
358 | static void block_child_signals (sigset_t *prev_mask); | |
359 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
2277426b PA |
360 | |
361 | struct lwp_info; | |
362 | static struct lwp_info *add_lwp (ptid_t ptid); | |
363 | static void purge_lwp_list (int pid); | |
364 | static struct lwp_info *find_lwp_pid (ptid_t ptid); | |
365 | ||
ae087d01 DJ |
366 | \f |
367 | /* Trivial list manipulation functions to keep track of a list of | |
368 | new stopped processes. */ | |
369 | static void | |
3d799a95 | 370 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
371 | { |
372 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
373 | new_pid->pid = pid; | |
3d799a95 | 374 | new_pid->status = status; |
ae087d01 DJ |
375 | new_pid->next = *listp; |
376 | *listp = new_pid; | |
377 | } | |
378 | ||
379 | static int | |
3d799a95 | 380 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *status) |
ae087d01 DJ |
381 | { |
382 | struct simple_pid_list **p; | |
383 | ||
384 | for (p = listp; *p != NULL; p = &(*p)->next) | |
385 | if ((*p)->pid == pid) | |
386 | { | |
387 | struct simple_pid_list *next = (*p)->next; | |
3d799a95 | 388 | *status = (*p)->status; |
ae087d01 DJ |
389 | xfree (*p); |
390 | *p = next; | |
391 | return 1; | |
392 | } | |
393 | return 0; | |
394 | } | |
395 | ||
3d799a95 DJ |
396 | static void |
397 | linux_record_stopped_pid (int pid, int status) | |
ae087d01 | 398 | { |
3d799a95 | 399 | add_to_pid_list (&stopped_pids, pid, status); |
ae087d01 DJ |
400 | } |
401 | ||
3993f6b1 DJ |
402 | \f |
403 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
404 | ||
405 | static void | |
406 | linux_tracefork_child (void) | |
407 | { | |
408 | int ret; | |
409 | ||
410 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
411 | kill (getpid (), SIGSTOP); | |
412 | fork (); | |
48bb3cce | 413 | _exit (0); |
3993f6b1 DJ |
414 | } |
415 | ||
7feb7d06 | 416 | /* Wrapper function for waitpid which handles EINTR. */ |
b957e937 DJ |
417 | |
418 | static int | |
419 | my_waitpid (int pid, int *status, int flags) | |
420 | { | |
421 | int ret; | |
b84876c2 | 422 | |
b957e937 DJ |
423 | do |
424 | { | |
425 | ret = waitpid (pid, status, flags); | |
426 | } | |
427 | while (ret == -1 && errno == EINTR); | |
428 | ||
429 | return ret; | |
430 | } | |
431 | ||
432 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
433 | ||
434 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
435 | we know that the feature is not available. This may change the tracing | |
436 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
437 | ||
438 | However, if it succeeds, we don't know for sure that the feature is | |
439 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 440 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
441 | fork tracing, and let it fork. If the process exits, we assume that we |
442 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
443 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
444 | |
445 | static void | |
b957e937 | 446 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
447 | { |
448 | int child_pid, ret, status; | |
449 | long second_pid; | |
7feb7d06 | 450 | sigset_t prev_mask; |
4c28f408 | 451 | |
7feb7d06 PA |
452 | /* We don't want those ptrace calls to be interrupted. */ |
453 | block_child_signals (&prev_mask); | |
3993f6b1 | 454 | |
b957e937 DJ |
455 | linux_supports_tracefork_flag = 0; |
456 | linux_supports_tracevforkdone_flag = 0; | |
457 | ||
458 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
459 | if (ret != 0) | |
7feb7d06 PA |
460 | { |
461 | restore_child_signals_mask (&prev_mask); | |
462 | return; | |
463 | } | |
b957e937 | 464 | |
3993f6b1 DJ |
465 | child_pid = fork (); |
466 | if (child_pid == -1) | |
e2e0b3e5 | 467 | perror_with_name (("fork")); |
3993f6b1 DJ |
468 | |
469 | if (child_pid == 0) | |
470 | linux_tracefork_child (); | |
471 | ||
b957e937 | 472 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 473 | if (ret == -1) |
e2e0b3e5 | 474 | perror_with_name (("waitpid")); |
3993f6b1 | 475 | else if (ret != child_pid) |
8a3fe4f8 | 476 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 477 | if (! WIFSTOPPED (status)) |
8a3fe4f8 | 478 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status); |
3993f6b1 | 479 | |
3993f6b1 DJ |
480 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
481 | if (ret != 0) | |
482 | { | |
b957e937 DJ |
483 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
484 | if (ret != 0) | |
485 | { | |
8a3fe4f8 | 486 | warning (_("linux_test_for_tracefork: failed to kill child")); |
7feb7d06 | 487 | restore_child_signals_mask (&prev_mask); |
b957e937 DJ |
488 | return; |
489 | } | |
490 | ||
491 | ret = my_waitpid (child_pid, &status, 0); | |
492 | if (ret != child_pid) | |
8a3fe4f8 | 493 | warning (_("linux_test_for_tracefork: failed to wait for killed child")); |
b957e937 | 494 | else if (!WIFSIGNALED (status)) |
8a3fe4f8 AC |
495 | warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from " |
496 | "killed child"), status); | |
b957e937 | 497 | |
7feb7d06 | 498 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
499 | return; |
500 | } | |
501 | ||
9016a515 DJ |
502 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
503 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
504 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
505 | linux_supports_tracevforkdone_flag = (ret == 0); | |
506 | ||
b957e937 DJ |
507 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
508 | if (ret != 0) | |
8a3fe4f8 | 509 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
510 | |
511 | ret = my_waitpid (child_pid, &status, 0); | |
512 | ||
3993f6b1 DJ |
513 | if (ret == child_pid && WIFSTOPPED (status) |
514 | && status >> 16 == PTRACE_EVENT_FORK) | |
515 | { | |
516 | second_pid = 0; | |
517 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
518 | if (ret == 0 && second_pid != 0) | |
519 | { | |
520 | int second_status; | |
521 | ||
522 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
523 | my_waitpid (second_pid, &second_status, 0); |
524 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
525 | if (ret != 0) | |
8a3fe4f8 | 526 | warning (_("linux_test_for_tracefork: failed to kill second child")); |
97725dc4 | 527 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
528 | } |
529 | } | |
b957e937 | 530 | else |
8a3fe4f8 AC |
531 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
532 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 533 | |
b957e937 DJ |
534 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
535 | if (ret != 0) | |
8a3fe4f8 | 536 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 537 | my_waitpid (child_pid, &status, 0); |
4c28f408 | 538 | |
7feb7d06 | 539 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
540 | } |
541 | ||
a96d9b2e SDJ |
542 | /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls. |
543 | ||
544 | We try to enable syscall tracing on ORIGINAL_PID. If this fails, | |
545 | we know that the feature is not available. This may change the tracing | |
546 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. */ | |
547 | ||
548 | static void | |
549 | linux_test_for_tracesysgood (int original_pid) | |
550 | { | |
551 | int ret; | |
552 | sigset_t prev_mask; | |
553 | ||
554 | /* We don't want those ptrace calls to be interrupted. */ | |
555 | block_child_signals (&prev_mask); | |
556 | ||
557 | linux_supports_tracesysgood_flag = 0; | |
558 | ||
559 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACESYSGOOD); | |
560 | if (ret != 0) | |
561 | goto out; | |
562 | ||
563 | linux_supports_tracesysgood_flag = 1; | |
564 | out: | |
565 | restore_child_signals_mask (&prev_mask); | |
566 | } | |
567 | ||
568 | /* Determine wether we support PTRACE_O_TRACESYSGOOD option available. | |
569 | This function also sets linux_supports_tracesysgood_flag. */ | |
570 | ||
571 | static int | |
572 | linux_supports_tracesysgood (int pid) | |
573 | { | |
574 | if (linux_supports_tracesysgood_flag == -1) | |
575 | linux_test_for_tracesysgood (pid); | |
576 | return linux_supports_tracesysgood_flag; | |
577 | } | |
578 | ||
3993f6b1 DJ |
579 | /* Return non-zero iff we have tracefork functionality available. |
580 | This function also sets linux_supports_tracefork_flag. */ | |
581 | ||
582 | static int | |
b957e937 | 583 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
584 | { |
585 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 586 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
587 | return linux_supports_tracefork_flag; |
588 | } | |
589 | ||
9016a515 | 590 | static int |
b957e937 | 591 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
592 | { |
593 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 594 | linux_test_for_tracefork (pid); |
9016a515 DJ |
595 | return linux_supports_tracevforkdone_flag; |
596 | } | |
597 | ||
a96d9b2e SDJ |
598 | static void |
599 | linux_enable_tracesysgood (ptid_t ptid) | |
600 | { | |
601 | int pid = ptid_get_lwp (ptid); | |
602 | ||
603 | if (pid == 0) | |
604 | pid = ptid_get_pid (ptid); | |
605 | ||
606 | if (linux_supports_tracesysgood (pid) == 0) | |
607 | return; | |
608 | ||
609 | current_ptrace_options |= PTRACE_O_TRACESYSGOOD; | |
610 | ||
611 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); | |
612 | } | |
613 | ||
3993f6b1 | 614 | \f |
4de4c07c DJ |
615 | void |
616 | linux_enable_event_reporting (ptid_t ptid) | |
617 | { | |
d3587048 | 618 | int pid = ptid_get_lwp (ptid); |
4de4c07c | 619 | |
d3587048 DJ |
620 | if (pid == 0) |
621 | pid = ptid_get_pid (ptid); | |
622 | ||
b957e937 | 623 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
624 | return; |
625 | ||
a96d9b2e SDJ |
626 | current_ptrace_options |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK |
627 | | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE; | |
628 | ||
b957e937 | 629 | if (linux_supports_tracevforkdone (pid)) |
a96d9b2e | 630 | current_ptrace_options |= PTRACE_O_TRACEVFORKDONE; |
9016a515 DJ |
631 | |
632 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
633 | read-only process state. */ | |
4de4c07c | 634 | |
a96d9b2e | 635 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); |
4de4c07c DJ |
636 | } |
637 | ||
6d8fd2b7 UW |
638 | static void |
639 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
640 | { |
641 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
0ec9a092 | 642 | check_for_thread_db (); |
a96d9b2e | 643 | linux_enable_tracesysgood (pid_to_ptid (pid)); |
4de4c07c DJ |
644 | } |
645 | ||
10d6c8cd | 646 | static void |
4de4c07c DJ |
647 | linux_child_post_startup_inferior (ptid_t ptid) |
648 | { | |
649 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 650 | check_for_thread_db (); |
a96d9b2e | 651 | linux_enable_tracesysgood (ptid); |
4de4c07c DJ |
652 | } |
653 | ||
6d8fd2b7 UW |
654 | static int |
655 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 656 | { |
7feb7d06 | 657 | sigset_t prev_mask; |
9016a515 | 658 | int has_vforked; |
4de4c07c DJ |
659 | int parent_pid, child_pid; |
660 | ||
7feb7d06 | 661 | block_child_signals (&prev_mask); |
b84876c2 | 662 | |
e58b0e63 PA |
663 | has_vforked = (inferior_thread ()->pending_follow.kind |
664 | == TARGET_WAITKIND_VFORKED); | |
665 | parent_pid = ptid_get_lwp (inferior_ptid); | |
d3587048 | 666 | if (parent_pid == 0) |
e58b0e63 PA |
667 | parent_pid = ptid_get_pid (inferior_ptid); |
668 | child_pid = PIDGET (inferior_thread ()->pending_follow.value.related_pid); | |
4de4c07c | 669 | |
2277426b PA |
670 | if (!detach_fork) |
671 | linux_enable_event_reporting (pid_to_ptid (child_pid)); | |
672 | ||
6c95b8df PA |
673 | if (has_vforked |
674 | && !non_stop /* Non-stop always resumes both branches. */ | |
675 | && (!target_is_async_p () || sync_execution) | |
676 | && !(follow_child || detach_fork || sched_multi)) | |
677 | { | |
678 | /* The parent stays blocked inside the vfork syscall until the | |
679 | child execs or exits. If we don't let the child run, then | |
680 | the parent stays blocked. If we're telling the parent to run | |
681 | in the foreground, the user will not be able to ctrl-c to get | |
682 | back the terminal, effectively hanging the debug session. */ | |
683 | fprintf_filtered (gdb_stderr, _("\ | |
684 | Can not resume the parent process over vfork in the foreground while \n\ | |
685 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
686 | \"set schedule-multiple\".\n")); | |
687 | return 1; | |
688 | } | |
689 | ||
4de4c07c DJ |
690 | if (! follow_child) |
691 | { | |
6c95b8df | 692 | struct lwp_info *child_lp = NULL; |
4de4c07c | 693 | |
6c95b8df | 694 | /* We're already attached to the parent, by default. */ |
4de4c07c | 695 | |
ac264b3b MS |
696 | /* Detach new forked process? */ |
697 | if (detach_fork) | |
f75c00e4 | 698 | { |
6c95b8df PA |
699 | /* Before detaching from the child, remove all breakpoints |
700 | from it. If we forked, then this has already been taken | |
701 | care of by infrun.c. If we vforked however, any | |
702 | breakpoint inserted in the parent is visible in the | |
703 | child, even those added while stopped in a vfork | |
704 | catchpoint. This will remove the breakpoints from the | |
705 | parent also, but they'll be reinserted below. */ | |
706 | if (has_vforked) | |
707 | { | |
708 | /* keep breakpoints list in sync. */ | |
709 | remove_breakpoints_pid (GET_PID (inferior_ptid)); | |
710 | } | |
711 | ||
e85a822c | 712 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
713 | { |
714 | target_terminal_ours (); | |
715 | fprintf_filtered (gdb_stdlog, | |
716 | "Detaching after fork from child process %d.\n", | |
717 | child_pid); | |
718 | } | |
4de4c07c | 719 | |
ac264b3b MS |
720 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
721 | } | |
722 | else | |
723 | { | |
77435e4c | 724 | struct inferior *parent_inf, *child_inf; |
2277426b | 725 | struct cleanup *old_chain; |
7f9f62ba PA |
726 | |
727 | /* Add process to GDB's tables. */ | |
77435e4c PA |
728 | child_inf = add_inferior (child_pid); |
729 | ||
e58b0e63 | 730 | parent_inf = current_inferior (); |
77435e4c | 731 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 732 | copy_terminal_info (child_inf, parent_inf); |
7f9f62ba | 733 | |
2277426b | 734 | old_chain = save_inferior_ptid (); |
6c95b8df | 735 | save_current_program_space (); |
2277426b PA |
736 | |
737 | inferior_ptid = ptid_build (child_pid, child_pid, 0); | |
738 | add_thread (inferior_ptid); | |
6c95b8df PA |
739 | child_lp = add_lwp (inferior_ptid); |
740 | child_lp->stopped = 1; | |
741 | child_lp->resumed = 1; | |
2277426b | 742 | |
6c95b8df PA |
743 | /* If this is a vfork child, then the address-space is |
744 | shared with the parent. */ | |
745 | if (has_vforked) | |
746 | { | |
747 | child_inf->pspace = parent_inf->pspace; | |
748 | child_inf->aspace = parent_inf->aspace; | |
749 | ||
750 | /* The parent will be frozen until the child is done | |
751 | with the shared region. Keep track of the | |
752 | parent. */ | |
753 | child_inf->vfork_parent = parent_inf; | |
754 | child_inf->pending_detach = 0; | |
755 | parent_inf->vfork_child = child_inf; | |
756 | parent_inf->pending_detach = 0; | |
757 | } | |
758 | else | |
759 | { | |
760 | child_inf->aspace = new_address_space (); | |
761 | child_inf->pspace = add_program_space (child_inf->aspace); | |
762 | child_inf->removable = 1; | |
763 | set_current_program_space (child_inf->pspace); | |
764 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
765 | ||
766 | /* Let the shared library layer (solib-svr4) learn about | |
767 | this new process, relocate the cloned exec, pull in | |
768 | shared libraries, and install the solib event | |
769 | breakpoint. If a "cloned-VM" event was propagated | |
770 | better throughout the core, this wouldn't be | |
771 | required. */ | |
268a4a75 | 772 | solib_create_inferior_hook (0); |
6c95b8df PA |
773 | } |
774 | ||
775 | /* Let the thread_db layer learn about this new process. */ | |
2277426b PA |
776 | check_for_thread_db (); |
777 | ||
778 | do_cleanups (old_chain); | |
ac264b3b | 779 | } |
9016a515 DJ |
780 | |
781 | if (has_vforked) | |
782 | { | |
6c95b8df PA |
783 | struct lwp_info *lp; |
784 | struct inferior *parent_inf; | |
785 | ||
786 | parent_inf = current_inferior (); | |
787 | ||
788 | /* If we detached from the child, then we have to be careful | |
789 | to not insert breakpoints in the parent until the child | |
790 | is done with the shared memory region. However, if we're | |
791 | staying attached to the child, then we can and should | |
792 | insert breakpoints, so that we can debug it. A | |
793 | subsequent child exec or exit is enough to know when does | |
794 | the child stops using the parent's address space. */ | |
795 | parent_inf->waiting_for_vfork_done = detach_fork; | |
56710373 | 796 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
6c95b8df PA |
797 | |
798 | lp = find_lwp_pid (pid_to_ptid (parent_pid)); | |
b957e937 DJ |
799 | gdb_assert (linux_supports_tracefork_flag >= 0); |
800 | if (linux_supports_tracevforkdone (0)) | |
9016a515 | 801 | { |
6c95b8df PA |
802 | if (debug_linux_nat) |
803 | fprintf_unfiltered (gdb_stdlog, | |
804 | "LCFF: waiting for VFORK_DONE on %d\n", | |
805 | parent_pid); | |
806 | ||
807 | lp->stopped = 1; | |
808 | lp->resumed = 1; | |
9016a515 | 809 | |
6c95b8df PA |
810 | /* We'll handle the VFORK_DONE event like any other |
811 | event, in target_wait. */ | |
9016a515 DJ |
812 | } |
813 | else | |
814 | { | |
815 | /* We can't insert breakpoints until the child has | |
816 | finished with the shared memory region. We need to | |
817 | wait until that happens. Ideal would be to just | |
818 | call: | |
819 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
820 | - waitpid (parent_pid, &status, __WALL); | |
821 | However, most architectures can't handle a syscall | |
822 | being traced on the way out if it wasn't traced on | |
823 | the way in. | |
824 | ||
825 | We might also think to loop, continuing the child | |
826 | until it exits or gets a SIGTRAP. One problem is | |
827 | that the child might call ptrace with PTRACE_TRACEME. | |
828 | ||
829 | There's no simple and reliable way to figure out when | |
830 | the vforked child will be done with its copy of the | |
831 | shared memory. We could step it out of the syscall, | |
832 | two instructions, let it go, and then single-step the | |
833 | parent once. When we have hardware single-step, this | |
834 | would work; with software single-step it could still | |
835 | be made to work but we'd have to be able to insert | |
836 | single-step breakpoints in the child, and we'd have | |
837 | to insert -just- the single-step breakpoint in the | |
838 | parent. Very awkward. | |
839 | ||
840 | In the end, the best we can do is to make sure it | |
841 | runs for a little while. Hopefully it will be out of | |
842 | range of any breakpoints we reinsert. Usually this | |
843 | is only the single-step breakpoint at vfork's return | |
844 | point. */ | |
845 | ||
6c95b8df PA |
846 | if (debug_linux_nat) |
847 | fprintf_unfiltered (gdb_stdlog, | |
848 | "LCFF: no VFORK_DONE support, sleeping a bit\n"); | |
849 | ||
9016a515 | 850 | usleep (10000); |
9016a515 | 851 | |
6c95b8df PA |
852 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
853 | and leave it pending. The next linux_nat_resume call | |
854 | will notice a pending event, and bypasses actually | |
855 | resuming the inferior. */ | |
856 | lp->status = 0; | |
857 | lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
858 | lp->stopped = 0; | |
859 | lp->resumed = 1; | |
860 | ||
861 | /* If we're in async mode, need to tell the event loop | |
862 | there's something here to process. */ | |
863 | if (target_can_async_p ()) | |
864 | async_file_mark (); | |
865 | } | |
9016a515 | 866 | } |
4de4c07c | 867 | } |
3993f6b1 | 868 | else |
4de4c07c | 869 | { |
4e1c45ea | 870 | struct thread_info *tp; |
77435e4c | 871 | struct inferior *parent_inf, *child_inf; |
2277426b | 872 | struct lwp_info *lp; |
6c95b8df | 873 | struct program_space *parent_pspace; |
4de4c07c | 874 | |
e85a822c | 875 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
876 | { |
877 | target_terminal_ours (); | |
6c95b8df PA |
878 | if (has_vforked) |
879 | fprintf_filtered (gdb_stdlog, _("\ | |
880 | Attaching after process %d vfork to child process %d.\n"), | |
881 | parent_pid, child_pid); | |
882 | else | |
883 | fprintf_filtered (gdb_stdlog, _("\ | |
884 | Attaching after process %d fork to child process %d.\n"), | |
885 | parent_pid, child_pid); | |
f75c00e4 | 886 | } |
4de4c07c | 887 | |
7a7d3353 PA |
888 | /* Add the new inferior first, so that the target_detach below |
889 | doesn't unpush the target. */ | |
890 | ||
77435e4c PA |
891 | child_inf = add_inferior (child_pid); |
892 | ||
e58b0e63 | 893 | parent_inf = current_inferior (); |
77435e4c | 894 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 895 | copy_terminal_info (child_inf, parent_inf); |
7a7d3353 | 896 | |
6c95b8df | 897 | parent_pspace = parent_inf->pspace; |
9016a515 | 898 | |
6c95b8df PA |
899 | /* If we're vforking, we want to hold on to the parent until the |
900 | child exits or execs. At child exec or exit time we can | |
901 | remove the old breakpoints from the parent and detach or | |
902 | resume debugging it. Otherwise, detach the parent now; we'll | |
903 | want to reuse it's program/address spaces, but we can't set | |
904 | them to the child before removing breakpoints from the | |
905 | parent, otherwise, the breakpoints module could decide to | |
906 | remove breakpoints from the wrong process (since they'd be | |
907 | assigned to the same address space). */ | |
9016a515 DJ |
908 | |
909 | if (has_vforked) | |
7f9f62ba | 910 | { |
6c95b8df PA |
911 | gdb_assert (child_inf->vfork_parent == NULL); |
912 | gdb_assert (parent_inf->vfork_child == NULL); | |
913 | child_inf->vfork_parent = parent_inf; | |
914 | child_inf->pending_detach = 0; | |
915 | parent_inf->vfork_child = child_inf; | |
916 | parent_inf->pending_detach = detach_fork; | |
917 | parent_inf->waiting_for_vfork_done = 0; | |
ac264b3b | 918 | } |
2277426b | 919 | else if (detach_fork) |
b84876c2 | 920 | target_detach (NULL, 0); |
4de4c07c | 921 | |
6c95b8df PA |
922 | /* Note that the detach above makes PARENT_INF dangling. */ |
923 | ||
924 | /* Add the child thread to the appropriate lists, and switch to | |
925 | this new thread, before cloning the program space, and | |
926 | informing the solib layer about this new process. */ | |
927 | ||
9f0bdab8 | 928 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
2277426b PA |
929 | add_thread (inferior_ptid); |
930 | lp = add_lwp (inferior_ptid); | |
931 | lp->stopped = 1; | |
6c95b8df PA |
932 | lp->resumed = 1; |
933 | ||
934 | /* If this is a vfork child, then the address-space is shared | |
935 | with the parent. If we detached from the parent, then we can | |
936 | reuse the parent's program/address spaces. */ | |
937 | if (has_vforked || detach_fork) | |
938 | { | |
939 | child_inf->pspace = parent_pspace; | |
940 | child_inf->aspace = child_inf->pspace->aspace; | |
941 | } | |
942 | else | |
943 | { | |
944 | child_inf->aspace = new_address_space (); | |
945 | child_inf->pspace = add_program_space (child_inf->aspace); | |
946 | child_inf->removable = 1; | |
947 | set_current_program_space (child_inf->pspace); | |
948 | clone_program_space (child_inf->pspace, parent_pspace); | |
949 | ||
950 | /* Let the shared library layer (solib-svr4) learn about | |
951 | this new process, relocate the cloned exec, pull in | |
952 | shared libraries, and install the solib event breakpoint. | |
953 | If a "cloned-VM" event was propagated better throughout | |
954 | the core, this wouldn't be required. */ | |
268a4a75 | 955 | solib_create_inferior_hook (0); |
6c95b8df | 956 | } |
ac264b3b | 957 | |
6c95b8df | 958 | /* Let the thread_db layer learn about this new process. */ |
ef29ce1a | 959 | check_for_thread_db (); |
4de4c07c DJ |
960 | } |
961 | ||
7feb7d06 | 962 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
963 | return 0; |
964 | } | |
965 | ||
4de4c07c | 966 | \f |
6d8fd2b7 UW |
967 | static void |
968 | linux_child_insert_fork_catchpoint (int pid) | |
4de4c07c | 969 | { |
b957e937 | 970 | if (! linux_supports_tracefork (pid)) |
8a3fe4f8 | 971 | error (_("Your system does not support fork catchpoints.")); |
3993f6b1 DJ |
972 | } |
973 | ||
6d8fd2b7 UW |
974 | static void |
975 | linux_child_insert_vfork_catchpoint (int pid) | |
3993f6b1 | 976 | { |
b957e937 | 977 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 978 | error (_("Your system does not support vfork catchpoints.")); |
3993f6b1 DJ |
979 | } |
980 | ||
6d8fd2b7 UW |
981 | static void |
982 | linux_child_insert_exec_catchpoint (int pid) | |
3993f6b1 | 983 | { |
b957e937 | 984 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 985 | error (_("Your system does not support exec catchpoints.")); |
3993f6b1 DJ |
986 | } |
987 | ||
a96d9b2e SDJ |
988 | static int |
989 | linux_child_set_syscall_catchpoint (int pid, int needed, int any_count, | |
990 | int table_size, int *table) | |
991 | { | |
992 | if (! linux_supports_tracesysgood (pid)) | |
993 | error (_("Your system does not support syscall catchpoints.")); | |
994 | /* On GNU/Linux, we ignore the arguments. It means that we only | |
995 | enable the syscall catchpoints, but do not disable them. | |
996 | ||
997 | Also, we do not use the `table' information because we do not | |
998 | filter system calls here. We let GDB do the logic for us. */ | |
999 | return 0; | |
1000 | } | |
1001 | ||
d6b0e80f AC |
1002 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
1003 | are processes sharing the same VM space. A multi-threaded process | |
1004 | is basically a group of such processes. However, such a grouping | |
1005 | is almost entirely a user-space issue; the kernel doesn't enforce | |
1006 | such a grouping at all (this might change in the future). In | |
1007 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
1008 | Threads library) to provide such a grouping. | |
1009 | ||
1010 | It is perfectly well possible to write a multi-threaded application | |
1011 | without the assistance of a threads library, by using the clone | |
1012 | system call directly. This module should be able to give some | |
1013 | rudimentary support for debugging such applications if developers | |
1014 | specify the CLONE_PTRACE flag in the clone system call, and are | |
1015 | using the Linux kernel 2.4 or above. | |
1016 | ||
1017 | Note that there are some peculiarities in GNU/Linux that affect | |
1018 | this code: | |
1019 | ||
1020 | - In general one should specify the __WCLONE flag to waitpid in | |
1021 | order to make it report events for any of the cloned processes | |
1022 | (and leave it out for the initial process). However, if a cloned | |
1023 | process has exited the exit status is only reported if the | |
1024 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
1025 | we cannot use it since GDB must work on older systems too. | |
1026 | ||
1027 | - When a traced, cloned process exits and is waited for by the | |
1028 | debugger, the kernel reassigns it to the original parent and | |
1029 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
1030 | library doesn't notice this, which leads to the "zombie problem": | |
1031 | When debugged a multi-threaded process that spawns a lot of | |
1032 | threads will run out of processes, even if the threads exit, | |
1033 | because the "zombies" stay around. */ | |
1034 | ||
1035 | /* List of known LWPs. */ | |
9f0bdab8 | 1036 | struct lwp_info *lwp_list; |
d6b0e80f AC |
1037 | \f |
1038 | ||
d6b0e80f AC |
1039 | /* Original signal mask. */ |
1040 | static sigset_t normal_mask; | |
1041 | ||
1042 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
1043 | _initialize_linux_nat. */ | |
1044 | static sigset_t suspend_mask; | |
1045 | ||
7feb7d06 PA |
1046 | /* Signals to block to make that sigsuspend work. */ |
1047 | static sigset_t blocked_mask; | |
1048 | ||
1049 | /* SIGCHLD action. */ | |
1050 | struct sigaction sigchld_action; | |
b84876c2 | 1051 | |
7feb7d06 PA |
1052 | /* Block child signals (SIGCHLD and linux threads signals), and store |
1053 | the previous mask in PREV_MASK. */ | |
84e46146 | 1054 | |
7feb7d06 PA |
1055 | static void |
1056 | block_child_signals (sigset_t *prev_mask) | |
1057 | { | |
1058 | /* Make sure SIGCHLD is blocked. */ | |
1059 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
1060 | sigaddset (&blocked_mask, SIGCHLD); | |
1061 | ||
1062 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
1063 | } | |
1064 | ||
1065 | /* Restore child signals mask, previously returned by | |
1066 | block_child_signals. */ | |
1067 | ||
1068 | static void | |
1069 | restore_child_signals_mask (sigset_t *prev_mask) | |
1070 | { | |
1071 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
1072 | } | |
d6b0e80f AC |
1073 | \f |
1074 | ||
1075 | /* Prototypes for local functions. */ | |
1076 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 1077 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 1078 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd PA |
1079 | static int cancel_breakpoint (struct lwp_info *lp); |
1080 | ||
d6b0e80f AC |
1081 | \f |
1082 | /* Convert wait status STATUS to a string. Used for printing debug | |
1083 | messages only. */ | |
1084 | ||
1085 | static char * | |
1086 | status_to_str (int status) | |
1087 | { | |
1088 | static char buf[64]; | |
1089 | ||
1090 | if (WIFSTOPPED (status)) | |
206aa767 | 1091 | { |
ca2163eb | 1092 | if (WSTOPSIG (status) == SYSCALL_SIGTRAP) |
206aa767 DE |
1093 | snprintf (buf, sizeof (buf), "%s (stopped at syscall)", |
1094 | strsignal (SIGTRAP)); | |
1095 | else | |
1096 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
1097 | strsignal (WSTOPSIG (status))); | |
1098 | } | |
d6b0e80f AC |
1099 | else if (WIFSIGNALED (status)) |
1100 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
1101 | strsignal (WSTOPSIG (status))); | |
1102 | else | |
1103 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
1104 | ||
1105 | return buf; | |
1106 | } | |
1107 | ||
d90e17a7 PA |
1108 | /* Remove all LWPs belong to PID from the lwp list. */ |
1109 | ||
1110 | static void | |
1111 | purge_lwp_list (int pid) | |
1112 | { | |
1113 | struct lwp_info *lp, *lpprev, *lpnext; | |
1114 | ||
1115 | lpprev = NULL; | |
1116 | ||
1117 | for (lp = lwp_list; lp; lp = lpnext) | |
1118 | { | |
1119 | lpnext = lp->next; | |
1120 | ||
1121 | if (ptid_get_pid (lp->ptid) == pid) | |
1122 | { | |
1123 | if (lp == lwp_list) | |
1124 | lwp_list = lp->next; | |
1125 | else | |
1126 | lpprev->next = lp->next; | |
1127 | ||
1128 | xfree (lp); | |
1129 | } | |
1130 | else | |
1131 | lpprev = lp; | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | /* Return the number of known LWPs in the tgid given by PID. */ | |
1136 | ||
1137 | static int | |
1138 | num_lwps (int pid) | |
1139 | { | |
1140 | int count = 0; | |
1141 | struct lwp_info *lp; | |
1142 | ||
1143 | for (lp = lwp_list; lp; lp = lp->next) | |
1144 | if (ptid_get_pid (lp->ptid) == pid) | |
1145 | count++; | |
1146 | ||
1147 | return count; | |
d6b0e80f AC |
1148 | } |
1149 | ||
f973ed9c | 1150 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1151 | structure describing the new LWP. The LWP should already be stopped |
1152 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1153 | |
1154 | static struct lwp_info * | |
1155 | add_lwp (ptid_t ptid) | |
1156 | { | |
1157 | struct lwp_info *lp; | |
1158 | ||
1159 | gdb_assert (is_lwp (ptid)); | |
1160 | ||
1161 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1162 | ||
1163 | memset (lp, 0, sizeof (struct lwp_info)); | |
1164 | ||
1165 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1166 | ||
1167 | lp->ptid = ptid; | |
dc146f7c | 1168 | lp->core = -1; |
d6b0e80f AC |
1169 | |
1170 | lp->next = lwp_list; | |
1171 | lwp_list = lp; | |
d6b0e80f | 1172 | |
d90e17a7 | 1173 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1174 | linux_nat_new_thread (ptid); |
1175 | ||
d6b0e80f AC |
1176 | return lp; |
1177 | } | |
1178 | ||
1179 | /* Remove the LWP specified by PID from the list. */ | |
1180 | ||
1181 | static void | |
1182 | delete_lwp (ptid_t ptid) | |
1183 | { | |
1184 | struct lwp_info *lp, *lpprev; | |
1185 | ||
1186 | lpprev = NULL; | |
1187 | ||
1188 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1189 | if (ptid_equal (lp->ptid, ptid)) | |
1190 | break; | |
1191 | ||
1192 | if (!lp) | |
1193 | return; | |
1194 | ||
d6b0e80f AC |
1195 | if (lpprev) |
1196 | lpprev->next = lp->next; | |
1197 | else | |
1198 | lwp_list = lp->next; | |
1199 | ||
1200 | xfree (lp); | |
1201 | } | |
1202 | ||
1203 | /* Return a pointer to the structure describing the LWP corresponding | |
1204 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1205 | ||
1206 | static struct lwp_info * | |
1207 | find_lwp_pid (ptid_t ptid) | |
1208 | { | |
1209 | struct lwp_info *lp; | |
1210 | int lwp; | |
1211 | ||
1212 | if (is_lwp (ptid)) | |
1213 | lwp = GET_LWP (ptid); | |
1214 | else | |
1215 | lwp = GET_PID (ptid); | |
1216 | ||
1217 | for (lp = lwp_list; lp; lp = lp->next) | |
1218 | if (lwp == GET_LWP (lp->ptid)) | |
1219 | return lp; | |
1220 | ||
1221 | return NULL; | |
1222 | } | |
1223 | ||
d90e17a7 PA |
1224 | /* Returns true if PTID matches filter FILTER. FILTER can be the wild |
1225 | card MINUS_ONE_PTID (all ptid match it); can be a ptid representing | |
1226 | a process (ptid_is_pid returns true), in which case, all lwps of | |
1227 | that give process match, lwps of other process do not; or, it can | |
1228 | represent a specific thread, in which case, only that thread will | |
1229 | match true. PTID must represent an LWP, it can never be a wild | |
1230 | card. */ | |
1231 | ||
1232 | static int | |
1233 | ptid_match (ptid_t ptid, ptid_t filter) | |
1234 | { | |
1235 | /* Since both parameters have the same type, prevent easy mistakes | |
1236 | from happening. */ | |
1237 | gdb_assert (!ptid_equal (ptid, minus_one_ptid) | |
1238 | && !ptid_equal (ptid, null_ptid)); | |
1239 | ||
1240 | if (ptid_equal (filter, minus_one_ptid)) | |
1241 | return 1; | |
1242 | if (ptid_is_pid (filter) | |
1243 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
1244 | return 1; | |
1245 | else if (ptid_equal (ptid, filter)) | |
1246 | return 1; | |
1247 | ||
1248 | return 0; | |
1249 | } | |
1250 | ||
d6b0e80f AC |
1251 | /* Call CALLBACK with its second argument set to DATA for every LWP in |
1252 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1253 | pointer to the structure describing that LWP immediately. | |
1254 | Otherwise return NULL. */ | |
1255 | ||
1256 | struct lwp_info * | |
d90e17a7 PA |
1257 | iterate_over_lwps (ptid_t filter, |
1258 | int (*callback) (struct lwp_info *, void *), | |
1259 | void *data) | |
d6b0e80f AC |
1260 | { |
1261 | struct lwp_info *lp, *lpnext; | |
1262 | ||
1263 | for (lp = lwp_list; lp; lp = lpnext) | |
1264 | { | |
1265 | lpnext = lp->next; | |
d90e17a7 PA |
1266 | |
1267 | if (ptid_match (lp->ptid, filter)) | |
1268 | { | |
1269 | if ((*callback) (lp, data)) | |
1270 | return lp; | |
1271 | } | |
d6b0e80f AC |
1272 | } |
1273 | ||
1274 | return NULL; | |
1275 | } | |
1276 | ||
2277426b PA |
1277 | /* Update our internal state when changing from one checkpoint to |
1278 | another indicated by NEW_PTID. We can only switch single-threaded | |
1279 | applications, so we only create one new LWP, and the previous list | |
1280 | is discarded. */ | |
f973ed9c DJ |
1281 | |
1282 | void | |
1283 | linux_nat_switch_fork (ptid_t new_ptid) | |
1284 | { | |
1285 | struct lwp_info *lp; | |
1286 | ||
2277426b PA |
1287 | purge_lwp_list (GET_PID (inferior_ptid)); |
1288 | ||
f973ed9c DJ |
1289 | lp = add_lwp (new_ptid); |
1290 | lp->stopped = 1; | |
e26af52f | 1291 | |
2277426b PA |
1292 | /* This changes the thread's ptid while preserving the gdb thread |
1293 | num. Also changes the inferior pid, while preserving the | |
1294 | inferior num. */ | |
1295 | thread_change_ptid (inferior_ptid, new_ptid); | |
1296 | ||
1297 | /* We've just told GDB core that the thread changed target id, but, | |
1298 | in fact, it really is a different thread, with different register | |
1299 | contents. */ | |
1300 | registers_changed (); | |
e26af52f DJ |
1301 | } |
1302 | ||
e26af52f DJ |
1303 | /* Handle the exit of a single thread LP. */ |
1304 | ||
1305 | static void | |
1306 | exit_lwp (struct lwp_info *lp) | |
1307 | { | |
e09875d4 | 1308 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1309 | |
1310 | if (th) | |
e26af52f | 1311 | { |
17faa917 DJ |
1312 | if (print_thread_events) |
1313 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1314 | ||
4f8d22e3 | 1315 | delete_thread (lp->ptid); |
e26af52f DJ |
1316 | } |
1317 | ||
1318 | delete_lwp (lp->ptid); | |
1319 | } | |
1320 | ||
4d062f1a PA |
1321 | /* Return an lwp's tgid, found in `/proc/PID/status'. */ |
1322 | ||
1323 | int | |
1324 | linux_proc_get_tgid (int lwpid) | |
1325 | { | |
1326 | FILE *status_file; | |
1327 | char buf[100]; | |
1328 | int tgid = -1; | |
1329 | ||
1330 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid); | |
1331 | status_file = fopen (buf, "r"); | |
1332 | if (status_file != NULL) | |
1333 | { | |
1334 | while (fgets (buf, sizeof (buf), status_file)) | |
1335 | { | |
1336 | if (strncmp (buf, "Tgid:", 5) == 0) | |
1337 | { | |
1338 | tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10); | |
1339 | break; | |
1340 | } | |
1341 | } | |
1342 | ||
1343 | fclose (status_file); | |
1344 | } | |
1345 | ||
1346 | return tgid; | |
1347 | } | |
1348 | ||
a0ef4274 DJ |
1349 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1350 | Other states including `T (tracing stop)' are reported as false. */ | |
1351 | ||
1352 | static int | |
1353 | pid_is_stopped (pid_t pid) | |
1354 | { | |
1355 | FILE *status_file; | |
1356 | char buf[100]; | |
1357 | int retval = 0; | |
1358 | ||
1359 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1360 | status_file = fopen (buf, "r"); | |
1361 | if (status_file != NULL) | |
1362 | { | |
1363 | int have_state = 0; | |
1364 | ||
1365 | while (fgets (buf, sizeof (buf), status_file)) | |
1366 | { | |
1367 | if (strncmp (buf, "State:", 6) == 0) | |
1368 | { | |
1369 | have_state = 1; | |
1370 | break; | |
1371 | } | |
1372 | } | |
1373 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1374 | retval = 1; | |
1375 | fclose (status_file); | |
1376 | } | |
1377 | return retval; | |
1378 | } | |
1379 | ||
1380 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1381 | Returns a wait status for that LWP, to cache. */ | |
1382 | ||
1383 | static int | |
1384 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1385 | int *signalled) | |
1386 | { | |
1387 | pid_t new_pid, pid = GET_LWP (ptid); | |
1388 | int status; | |
1389 | ||
1390 | if (pid_is_stopped (pid)) | |
1391 | { | |
1392 | if (debug_linux_nat) | |
1393 | fprintf_unfiltered (gdb_stdlog, | |
1394 | "LNPAW: Attaching to a stopped process\n"); | |
1395 | ||
1396 | /* The process is definitely stopped. It is in a job control | |
1397 | stop, unless the kernel predates the TASK_STOPPED / | |
1398 | TASK_TRACED distinction, in which case it might be in a | |
1399 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1400 | can kill it, signal it, et cetera. | |
1401 | ||
1402 | First make sure there is a pending SIGSTOP. Since we are | |
1403 | already attached, the process can not transition from stopped | |
1404 | to running without a PTRACE_CONT; so we know this signal will | |
1405 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1406 | probably already in the queue (unless this kernel is old | |
1407 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1408 | is not an RT signal, it can only be queued once. */ | |
1409 | kill_lwp (pid, SIGSTOP); | |
1410 | ||
1411 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1412 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1413 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1414 | } | |
1415 | ||
1416 | /* Make sure the initial process is stopped. The user-level threads | |
1417 | layer might want to poke around in the inferior, and that won't | |
1418 | work if things haven't stabilized yet. */ | |
1419 | new_pid = my_waitpid (pid, &status, 0); | |
1420 | if (new_pid == -1 && errno == ECHILD) | |
1421 | { | |
1422 | if (first) | |
1423 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1424 | ||
1425 | /* Try again with __WCLONE to check cloned processes. */ | |
1426 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1427 | *cloned = 1; | |
1428 | } | |
1429 | ||
dacc9cb2 PP |
1430 | gdb_assert (pid == new_pid); |
1431 | ||
1432 | if (!WIFSTOPPED (status)) | |
1433 | { | |
1434 | /* The pid we tried to attach has apparently just exited. */ | |
1435 | if (debug_linux_nat) | |
1436 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1437 | pid, status_to_str (status)); | |
1438 | return status; | |
1439 | } | |
a0ef4274 DJ |
1440 | |
1441 | if (WSTOPSIG (status) != SIGSTOP) | |
1442 | { | |
1443 | *signalled = 1; | |
1444 | if (debug_linux_nat) | |
1445 | fprintf_unfiltered (gdb_stdlog, | |
1446 | "LNPAW: Received %s after attaching\n", | |
1447 | status_to_str (status)); | |
1448 | } | |
1449 | ||
1450 | return status; | |
1451 | } | |
1452 | ||
1453 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1454 | if the new LWP could not be attached. */ | |
d6b0e80f | 1455 | |
9ee57c33 | 1456 | int |
93815fbf | 1457 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1458 | { |
9ee57c33 | 1459 | struct lwp_info *lp; |
7feb7d06 | 1460 | sigset_t prev_mask; |
d6b0e80f AC |
1461 | |
1462 | gdb_assert (is_lwp (ptid)); | |
1463 | ||
7feb7d06 | 1464 | block_child_signals (&prev_mask); |
d6b0e80f | 1465 | |
9ee57c33 | 1466 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1467 | |
1468 | /* We assume that we're already attached to any LWP that has an id | |
1469 | equal to the overall process id, and to any LWP that is already | |
1470 | in our list of LWPs. If we're not seeing exit events from threads | |
1471 | and we've had PID wraparound since we last tried to stop all threads, | |
1472 | this assumption might be wrong; fortunately, this is very unlikely | |
1473 | to happen. */ | |
9ee57c33 | 1474 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1475 | { |
a0ef4274 | 1476 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1477 | |
1478 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1479 | { |
1480 | /* If we fail to attach to the thread, issue a warning, | |
1481 | but continue. One way this can happen is if thread | |
e9efe249 | 1482 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1483 | bug may place threads in the thread list and then fail |
1484 | to create them. */ | |
1485 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1486 | safe_strerror (errno)); | |
7feb7d06 | 1487 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1488 | return -1; |
1489 | } | |
1490 | ||
d6b0e80f AC |
1491 | if (debug_linux_nat) |
1492 | fprintf_unfiltered (gdb_stdlog, | |
1493 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1494 | target_pid_to_str (ptid)); | |
1495 | ||
a0ef4274 | 1496 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
dacc9cb2 PP |
1497 | if (!WIFSTOPPED (status)) |
1498 | return -1; | |
1499 | ||
a0ef4274 DJ |
1500 | lp = add_lwp (ptid); |
1501 | lp->stopped = 1; | |
1502 | lp->cloned = cloned; | |
1503 | lp->signalled = signalled; | |
1504 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1505 | { |
a0ef4274 DJ |
1506 | lp->resumed = 1; |
1507 | lp->status = status; | |
d6b0e80f AC |
1508 | } |
1509 | ||
a0ef4274 | 1510 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1511 | |
1512 | if (debug_linux_nat) | |
1513 | { | |
1514 | fprintf_unfiltered (gdb_stdlog, | |
1515 | "LLAL: waitpid %s received %s\n", | |
1516 | target_pid_to_str (ptid), | |
1517 | status_to_str (status)); | |
1518 | } | |
1519 | } | |
1520 | else | |
1521 | { | |
1522 | /* We assume that the LWP representing the original process is | |
1523 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1524 | that the GNU/linux ptrace layer uses to keep track of |
1525 | threads. Note that this won't have already been done since | |
1526 | the main thread will have, we assume, been stopped by an | |
1527 | attach from a different layer. */ | |
9ee57c33 DJ |
1528 | if (lp == NULL) |
1529 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1530 | lp->stopped = 1; |
1531 | } | |
9ee57c33 | 1532 | |
7feb7d06 | 1533 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1534 | return 0; |
d6b0e80f AC |
1535 | } |
1536 | ||
b84876c2 | 1537 | static void |
136d6dae VP |
1538 | linux_nat_create_inferior (struct target_ops *ops, |
1539 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1540 | int from_tty) |
1541 | { | |
10568435 JK |
1542 | #ifdef HAVE_PERSONALITY |
1543 | int personality_orig = 0, personality_set = 0; | |
1544 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1545 | |
1546 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1547 | we have to mask the async mode. */ | |
1548 | ||
10568435 JK |
1549 | #ifdef HAVE_PERSONALITY |
1550 | if (disable_randomization) | |
1551 | { | |
1552 | errno = 0; | |
1553 | personality_orig = personality (0xffffffff); | |
1554 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1555 | { | |
1556 | personality_set = 1; | |
1557 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1558 | } | |
1559 | if (errno != 0 || (personality_set | |
1560 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1561 | warning (_("Error disabling address space randomization: %s"), | |
1562 | safe_strerror (errno)); | |
1563 | } | |
1564 | #endif /* HAVE_PERSONALITY */ | |
1565 | ||
136d6dae | 1566 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1567 | |
10568435 JK |
1568 | #ifdef HAVE_PERSONALITY |
1569 | if (personality_set) | |
1570 | { | |
1571 | errno = 0; | |
1572 | personality (personality_orig); | |
1573 | if (errno != 0) | |
1574 | warning (_("Error restoring address space randomization: %s"), | |
1575 | safe_strerror (errno)); | |
1576 | } | |
1577 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1578 | } |
1579 | ||
d6b0e80f | 1580 | static void |
136d6dae | 1581 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1582 | { |
1583 | struct lwp_info *lp; | |
d6b0e80f | 1584 | int status; |
af990527 | 1585 | ptid_t ptid; |
d6b0e80f | 1586 | |
136d6dae | 1587 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1588 | |
af990527 PA |
1589 | /* The ptrace base target adds the main thread with (pid,0,0) |
1590 | format. Decorate it with lwp info. */ | |
1591 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1592 | thread_change_ptid (inferior_ptid, ptid); | |
1593 | ||
9f0bdab8 | 1594 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1595 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1596 | |
1597 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1598 | &lp->signalled); | |
dacc9cb2 PP |
1599 | if (!WIFSTOPPED (status)) |
1600 | { | |
1601 | if (WIFEXITED (status)) | |
1602 | { | |
1603 | int exit_code = WEXITSTATUS (status); | |
1604 | ||
1605 | target_terminal_ours (); | |
1606 | target_mourn_inferior (); | |
1607 | if (exit_code == 0) | |
1608 | error (_("Unable to attach: program exited normally.")); | |
1609 | else | |
1610 | error (_("Unable to attach: program exited with code %d."), | |
1611 | exit_code); | |
1612 | } | |
1613 | else if (WIFSIGNALED (status)) | |
1614 | { | |
1615 | enum target_signal signo; | |
1616 | ||
1617 | target_terminal_ours (); | |
1618 | target_mourn_inferior (); | |
1619 | ||
1620 | signo = target_signal_from_host (WTERMSIG (status)); | |
1621 | error (_("Unable to attach: program terminated with signal " | |
1622 | "%s, %s."), | |
1623 | target_signal_to_name (signo), | |
1624 | target_signal_to_string (signo)); | |
1625 | } | |
1626 | ||
1627 | internal_error (__FILE__, __LINE__, | |
1628 | _("unexpected status %d for PID %ld"), | |
1629 | status, (long) GET_LWP (ptid)); | |
1630 | } | |
1631 | ||
a0ef4274 | 1632 | lp->stopped = 1; |
9f0bdab8 | 1633 | |
a0ef4274 | 1634 | /* Save the wait status to report later. */ |
d6b0e80f | 1635 | lp->resumed = 1; |
a0ef4274 DJ |
1636 | if (debug_linux_nat) |
1637 | fprintf_unfiltered (gdb_stdlog, | |
1638 | "LNA: waitpid %ld, saving status %s\n", | |
1639 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1640 | |
7feb7d06 PA |
1641 | lp->status = status; |
1642 | ||
1643 | if (target_can_async_p ()) | |
1644 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1645 | } |
1646 | ||
a0ef4274 DJ |
1647 | /* Get pending status of LP. */ |
1648 | static int | |
1649 | get_pending_status (struct lwp_info *lp, int *status) | |
1650 | { | |
ca2163eb PA |
1651 | enum target_signal signo = TARGET_SIGNAL_0; |
1652 | ||
1653 | /* If we paused threads momentarily, we may have stored pending | |
1654 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1655 | and GDB core hasn't seen any signal for those threads. | |
1656 | Otherwise, the last signal reported to the core is found in the | |
1657 | thread object's stop_signal. | |
1658 | ||
1659 | There's a corner case that isn't handled here at present. Only | |
1660 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1661 | stop_signal make sense as a real signal to pass to the inferior. | |
1662 | Some catchpoint related events, like | |
1663 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
1664 | to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But, | |
1665 | those traps are debug API (ptrace in our case) related and | |
1666 | induced; the inferior wouldn't see them if it wasn't being | |
1667 | traced. Hence, we should never pass them to the inferior, even | |
1668 | when set to pass state. Since this corner case isn't handled by | |
1669 | infrun.c when proceeding with a signal, for consistency, neither | |
1670 | do we handle it here (or elsewhere in the file we check for | |
1671 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1672 | this is really a corner case. */ | |
1673 | ||
1674 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
1675 | signo = TARGET_SIGNAL_0; /* a pending ptrace event, not a real signal. */ | |
1676 | else if (lp->status) | |
1677 | signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1678 | else if (non_stop && !is_executing (lp->ptid)) | |
1679 | { | |
1680 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
1681 | signo = tp->stop_signal; | |
1682 | } | |
1683 | else if (!non_stop) | |
a0ef4274 | 1684 | { |
ca2163eb PA |
1685 | struct target_waitstatus last; |
1686 | ptid_t last_ptid; | |
4c28f408 | 1687 | |
ca2163eb | 1688 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1689 | |
ca2163eb PA |
1690 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) |
1691 | { | |
e09875d4 | 1692 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
2020b7ab | 1693 | signo = tp->stop_signal; |
4c28f408 | 1694 | } |
ca2163eb | 1695 | } |
4c28f408 | 1696 | |
ca2163eb | 1697 | *status = 0; |
4c28f408 | 1698 | |
ca2163eb PA |
1699 | if (signo == TARGET_SIGNAL_0) |
1700 | { | |
1701 | if (debug_linux_nat) | |
1702 | fprintf_unfiltered (gdb_stdlog, | |
1703 | "GPT: lwp %s has no pending signal\n", | |
1704 | target_pid_to_str (lp->ptid)); | |
1705 | } | |
1706 | else if (!signal_pass_state (signo)) | |
1707 | { | |
1708 | if (debug_linux_nat) | |
1709 | fprintf_unfiltered (gdb_stdlog, "\ | |
1710 | GPT: lwp %s had signal %s, but it is in no pass state\n", | |
1711 | target_pid_to_str (lp->ptid), | |
1712 | target_signal_to_string (signo)); | |
a0ef4274 | 1713 | } |
a0ef4274 | 1714 | else |
4c28f408 | 1715 | { |
ca2163eb PA |
1716 | *status = W_STOPCODE (target_signal_to_host (signo)); |
1717 | ||
1718 | if (debug_linux_nat) | |
1719 | fprintf_unfiltered (gdb_stdlog, | |
1720 | "GPT: lwp %s has pending signal %s\n", | |
1721 | target_pid_to_str (lp->ptid), | |
1722 | target_signal_to_string (signo)); | |
4c28f408 | 1723 | } |
a0ef4274 DJ |
1724 | |
1725 | return 0; | |
1726 | } | |
1727 | ||
d6b0e80f AC |
1728 | static int |
1729 | detach_callback (struct lwp_info *lp, void *data) | |
1730 | { | |
1731 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1732 | ||
1733 | if (debug_linux_nat && lp->status) | |
1734 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1735 | strsignal (WSTOPSIG (lp->status)), | |
1736 | target_pid_to_str (lp->ptid)); | |
1737 | ||
a0ef4274 DJ |
1738 | /* If there is a pending SIGSTOP, get rid of it. */ |
1739 | if (lp->signalled) | |
d6b0e80f | 1740 | { |
d6b0e80f AC |
1741 | if (debug_linux_nat) |
1742 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1743 | "DC: Sending SIGCONT to %s\n", |
1744 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1745 | |
a0ef4274 | 1746 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1747 | lp->signalled = 0; |
d6b0e80f AC |
1748 | } |
1749 | ||
1750 | /* We don't actually detach from the LWP that has an id equal to the | |
1751 | overall process id just yet. */ | |
1752 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1753 | { | |
a0ef4274 DJ |
1754 | int status = 0; |
1755 | ||
1756 | /* Pass on any pending signal for this LWP. */ | |
1757 | get_pending_status (lp, &status); | |
1758 | ||
d6b0e80f AC |
1759 | errno = 0; |
1760 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1761 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1762 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1763 | safe_strerror (errno)); |
1764 | ||
1765 | if (debug_linux_nat) | |
1766 | fprintf_unfiltered (gdb_stdlog, | |
1767 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1768 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1769 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1770 | |
1771 | delete_lwp (lp->ptid); | |
1772 | } | |
1773 | ||
1774 | return 0; | |
1775 | } | |
1776 | ||
1777 | static void | |
136d6dae | 1778 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1779 | { |
b84876c2 | 1780 | int pid; |
a0ef4274 DJ |
1781 | int status; |
1782 | enum target_signal sig; | |
d90e17a7 PA |
1783 | struct lwp_info *main_lwp; |
1784 | ||
1785 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1786 | |
b84876c2 PA |
1787 | if (target_can_async_p ()) |
1788 | linux_nat_async (NULL, 0); | |
1789 | ||
4c28f408 PA |
1790 | /* Stop all threads before detaching. ptrace requires that the |
1791 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1792 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1793 | /* ... and wait until all of them have reported back that |
1794 | they're no longer running. */ | |
d90e17a7 | 1795 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1796 | |
d90e17a7 | 1797 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1798 | |
1799 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1800 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1801 | ||
1802 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1803 | |
a0ef4274 DJ |
1804 | /* Pass on any pending signal for the last LWP. */ |
1805 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1806 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1807 | && WIFSTOPPED (status)) |
1808 | { | |
1809 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1810 | pass it along with PTRACE_DETACH. */ | |
1811 | args = alloca (8); | |
1812 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
1813 | fprintf_unfiltered (gdb_stdlog, | |
1814 | "LND: Sending signal %s to %s\n", | |
1815 | args, | |
d90e17a7 | 1816 | target_pid_to_str (main_lwp->ptid)); |
a0ef4274 DJ |
1817 | } |
1818 | ||
d90e17a7 | 1819 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1820 | |
7a7d3353 PA |
1821 | if (forks_exist_p ()) |
1822 | { | |
1823 | /* Multi-fork case. The current inferior_ptid is being detached | |
1824 | from, but there are other viable forks to debug. Detach from | |
1825 | the current fork, and context-switch to the first | |
1826 | available. */ | |
1827 | linux_fork_detach (args, from_tty); | |
1828 | ||
1829 | if (non_stop && target_can_async_p ()) | |
1830 | target_async (inferior_event_handler, 0); | |
1831 | } | |
1832 | else | |
1833 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1834 | } |
1835 | ||
1836 | /* Resume LP. */ | |
1837 | ||
1838 | static int | |
1839 | resume_callback (struct lwp_info *lp, void *data) | |
1840 | { | |
6c95b8df PA |
1841 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
1842 | ||
1843 | if (lp->stopped && inf->vfork_child != NULL) | |
1844 | { | |
1845 | if (debug_linux_nat) | |
1846 | fprintf_unfiltered (gdb_stdlog, | |
1847 | "RC: Not resuming %s (vfork parent)\n", | |
1848 | target_pid_to_str (lp->ptid)); | |
1849 | } | |
1850 | else if (lp->stopped && lp->status == 0) | |
d6b0e80f | 1851 | { |
d90e17a7 PA |
1852 | if (debug_linux_nat) |
1853 | fprintf_unfiltered (gdb_stdlog, | |
1854 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", | |
1855 | target_pid_to_str (lp->ptid)); | |
1856 | ||
28439f5e PA |
1857 | linux_ops->to_resume (linux_ops, |
1858 | pid_to_ptid (GET_LWP (lp->ptid)), | |
10d6c8cd | 1859 | 0, TARGET_SIGNAL_0); |
d6b0e80f AC |
1860 | if (debug_linux_nat) |
1861 | fprintf_unfiltered (gdb_stdlog, | |
1862 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1863 | target_pid_to_str (lp->ptid)); | |
1864 | lp->stopped = 0; | |
1865 | lp->step = 0; | |
9f0bdab8 | 1866 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 1867 | lp->stopped_by_watchpoint = 0; |
d6b0e80f | 1868 | } |
57380f4e DJ |
1869 | else if (lp->stopped && debug_linux_nat) |
1870 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (has pending)\n", | |
1871 | target_pid_to_str (lp->ptid)); | |
1872 | else if (debug_linux_nat) | |
1873 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (not stopped)\n", | |
1874 | target_pid_to_str (lp->ptid)); | |
d6b0e80f AC |
1875 | |
1876 | return 0; | |
1877 | } | |
1878 | ||
1879 | static int | |
1880 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1881 | { | |
1882 | lp->resumed = 0; | |
1883 | return 0; | |
1884 | } | |
1885 | ||
1886 | static int | |
1887 | resume_set_callback (struct lwp_info *lp, void *data) | |
1888 | { | |
1889 | lp->resumed = 1; | |
1890 | return 0; | |
1891 | } | |
1892 | ||
1893 | static void | |
28439f5e PA |
1894 | linux_nat_resume (struct target_ops *ops, |
1895 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1896 | { |
7feb7d06 | 1897 | sigset_t prev_mask; |
d6b0e80f | 1898 | struct lwp_info *lp; |
d90e17a7 | 1899 | int resume_many; |
d6b0e80f | 1900 | |
76f50ad1 DJ |
1901 | if (debug_linux_nat) |
1902 | fprintf_unfiltered (gdb_stdlog, | |
1903 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1904 | step ? "step" : "resume", | |
1905 | target_pid_to_str (ptid), | |
1906 | signo ? strsignal (signo) : "0", | |
1907 | target_pid_to_str (inferior_ptid)); | |
1908 | ||
7feb7d06 | 1909 | block_child_signals (&prev_mask); |
b84876c2 | 1910 | |
d6b0e80f | 1911 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1912 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1913 | || ptid_is_pid (ptid)); | |
4c28f408 | 1914 | |
e3e9f5a2 PA |
1915 | /* Mark the lwps we're resuming as resumed. */ |
1916 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
d6b0e80f | 1917 | |
d90e17a7 PA |
1918 | /* See if it's the current inferior that should be handled |
1919 | specially. */ | |
1920 | if (resume_many) | |
1921 | lp = find_lwp_pid (inferior_ptid); | |
1922 | else | |
1923 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1924 | gdb_assert (lp != NULL); |
d6b0e80f | 1925 | |
9f0bdab8 DJ |
1926 | /* Remember if we're stepping. */ |
1927 | lp->step = step; | |
d6b0e80f | 1928 | |
9f0bdab8 DJ |
1929 | /* If we have a pending wait status for this thread, there is no |
1930 | point in resuming the process. But first make sure that | |
1931 | linux_nat_wait won't preemptively handle the event - we | |
1932 | should never take this short-circuit if we are going to | |
1933 | leave LP running, since we have skipped resuming all the | |
1934 | other threads. This bit of code needs to be synchronized | |
1935 | with linux_nat_wait. */ | |
76f50ad1 | 1936 | |
9f0bdab8 DJ |
1937 | if (lp->status && WIFSTOPPED (lp->status)) |
1938 | { | |
d6b48e9c PA |
1939 | int saved_signo; |
1940 | struct inferior *inf; | |
76f50ad1 | 1941 | |
d90e17a7 | 1942 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); |
d6b48e9c PA |
1943 | gdb_assert (inf); |
1944 | saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1945 | ||
1946 | /* Defer to common code if we're gaining control of the | |
1947 | inferior. */ | |
1948 | if (inf->stop_soon == NO_STOP_QUIETLY | |
1949 | && signal_stop_state (saved_signo) == 0 | |
9f0bdab8 DJ |
1950 | && signal_print_state (saved_signo) == 0 |
1951 | && signal_pass_state (saved_signo) == 1) | |
d6b0e80f | 1952 | { |
9f0bdab8 DJ |
1953 | if (debug_linux_nat) |
1954 | fprintf_unfiltered (gdb_stdlog, | |
1955 | "LLR: Not short circuiting for ignored " | |
1956 | "status 0x%x\n", lp->status); | |
1957 | ||
d6b0e80f AC |
1958 | /* FIXME: What should we do if we are supposed to continue |
1959 | this thread with a signal? */ | |
1960 | gdb_assert (signo == TARGET_SIGNAL_0); | |
9f0bdab8 DJ |
1961 | signo = saved_signo; |
1962 | lp->status = 0; | |
1963 | } | |
1964 | } | |
76f50ad1 | 1965 | |
6c95b8df | 1966 | if (lp->status || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
9f0bdab8 DJ |
1967 | { |
1968 | /* FIXME: What should we do if we are supposed to continue | |
1969 | this thread with a signal? */ | |
1970 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1971 | |
9f0bdab8 DJ |
1972 | if (debug_linux_nat) |
1973 | fprintf_unfiltered (gdb_stdlog, | |
1974 | "LLR: Short circuiting for status 0x%x\n", | |
1975 | lp->status); | |
d6b0e80f | 1976 | |
7feb7d06 PA |
1977 | restore_child_signals_mask (&prev_mask); |
1978 | if (target_can_async_p ()) | |
1979 | { | |
1980 | target_async (inferior_event_handler, 0); | |
1981 | /* Tell the event loop we have something to process. */ | |
1982 | async_file_mark (); | |
1983 | } | |
9f0bdab8 | 1984 | return; |
d6b0e80f AC |
1985 | } |
1986 | ||
9f0bdab8 DJ |
1987 | /* Mark LWP as not stopped to prevent it from being continued by |
1988 | resume_callback. */ | |
1989 | lp->stopped = 0; | |
1990 | ||
d90e17a7 PA |
1991 | if (resume_many) |
1992 | iterate_over_lwps (ptid, resume_callback, NULL); | |
1993 | ||
1994 | /* Convert to something the lower layer understands. */ | |
1995 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 1996 | |
28439f5e | 1997 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 | 1998 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 1999 | lp->stopped_by_watchpoint = 0; |
9f0bdab8 | 2000 | |
d6b0e80f AC |
2001 | if (debug_linux_nat) |
2002 | fprintf_unfiltered (gdb_stdlog, | |
2003 | "LLR: %s %s, %s (resume event thread)\n", | |
2004 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2005 | target_pid_to_str (ptid), | |
2006 | signo ? strsignal (signo) : "0"); | |
b84876c2 | 2007 | |
7feb7d06 | 2008 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 2009 | if (target_can_async_p ()) |
8ea051c5 | 2010 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
2011 | } |
2012 | ||
c5f62d5f | 2013 | /* Send a signal to an LWP. */ |
d6b0e80f AC |
2014 | |
2015 | static int | |
2016 | kill_lwp (int lwpid, int signo) | |
2017 | { | |
c5f62d5f DE |
2018 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2019 | fails, then we are not using nptl threads and we should be using kill. */ | |
d6b0e80f AC |
2020 | |
2021 | #ifdef HAVE_TKILL_SYSCALL | |
c5f62d5f DE |
2022 | { |
2023 | static int tkill_failed; | |
2024 | ||
2025 | if (!tkill_failed) | |
2026 | { | |
2027 | int ret; | |
2028 | ||
2029 | errno = 0; | |
2030 | ret = syscall (__NR_tkill, lwpid, signo); | |
2031 | if (errno != ENOSYS) | |
2032 | return ret; | |
2033 | tkill_failed = 1; | |
2034 | } | |
2035 | } | |
d6b0e80f AC |
2036 | #endif |
2037 | ||
2038 | return kill (lwpid, signo); | |
2039 | } | |
2040 | ||
ca2163eb PA |
2041 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
2042 | event, check if the core is interested in it: if not, ignore the | |
2043 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
2044 | syscall entry/exit status, since the ptrace event itself doesn't | |
2045 | indicate it, and report the trap to higher layers. */ | |
2046 | ||
2047 | static int | |
2048 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
2049 | { | |
2050 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2051 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
2052 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2053 | ||
2054 | if (stopping) | |
2055 | { | |
2056 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
2057 | makes it so that the LWP reports an immediate syscall return, | |
2058 | followed by the SIGSTOP. Skip seeing that "return" using | |
2059 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
2060 | SIGSTOP. Later when the thread is resumed, a new syscall | |
2061 | entry event. If we didn't do this (and returned 0), we'd | |
2062 | leave a syscall entry pending, and our caller, by using | |
2063 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
2064 | itself. Later, when the user re-resumes this LWP, we'd see | |
2065 | another syscall entry event and we'd mistake it for a return. | |
2066 | ||
2067 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
2068 | (leaving immediately with LWP->signalled set, without issuing | |
2069 | a PTRACE_CONT), it would still be problematic to leave this | |
2070 | syscall enter pending, as later when the thread is resumed, | |
2071 | it would then see the same syscall exit mentioned above, | |
2072 | followed by the delayed SIGSTOP, while the syscall didn't | |
2073 | actually get to execute. It seems it would be even more | |
2074 | confusing to the user. */ | |
2075 | ||
2076 | if (debug_linux_nat) | |
2077 | fprintf_unfiltered (gdb_stdlog, | |
2078 | "LHST: ignoring syscall %d " | |
2079 | "for LWP %ld (stopping threads), " | |
2080 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
2081 | syscall_number, | |
2082 | GET_LWP (lp->ptid)); | |
2083 | ||
2084 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2085 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2086 | return 1; | |
2087 | } | |
2088 | ||
2089 | if (catch_syscall_enabled ()) | |
2090 | { | |
2091 | /* Always update the entry/return state, even if this particular | |
2092 | syscall isn't interesting to the core now. In async mode, | |
2093 | the user could install a new catchpoint for this syscall | |
2094 | between syscall enter/return, and we'll need to know to | |
2095 | report a syscall return if that happens. */ | |
2096 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2097 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2098 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2099 | ||
2100 | if (catching_syscall_number (syscall_number)) | |
2101 | { | |
2102 | /* Alright, an event to report. */ | |
2103 | ourstatus->kind = lp->syscall_state; | |
2104 | ourstatus->value.syscall_number = syscall_number; | |
2105 | ||
2106 | if (debug_linux_nat) | |
2107 | fprintf_unfiltered (gdb_stdlog, | |
2108 | "LHST: stopping for %s of syscall %d" | |
2109 | " for LWP %ld\n", | |
2110 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2111 | ? "entry" : "return", | |
2112 | syscall_number, | |
2113 | GET_LWP (lp->ptid)); | |
2114 | return 0; | |
2115 | } | |
2116 | ||
2117 | if (debug_linux_nat) | |
2118 | fprintf_unfiltered (gdb_stdlog, | |
2119 | "LHST: ignoring %s of syscall %d " | |
2120 | "for LWP %ld\n", | |
2121 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2122 | ? "entry" : "return", | |
2123 | syscall_number, | |
2124 | GET_LWP (lp->ptid)); | |
2125 | } | |
2126 | else | |
2127 | { | |
2128 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
2129 | before on this LWP, it could happen that the user removes all | |
2130 | syscall catchpoints before we get to process this event. | |
2131 | There are two noteworthy issues here: | |
2132 | ||
2133 | - When stopped at a syscall entry event, resuming with | |
2134 | PT_STEP still resumes executing the syscall and reports a | |
2135 | syscall return. | |
2136 | ||
2137 | - Only PT_SYSCALL catches syscall enters. If we last | |
2138 | single-stepped this thread, then this event can't be a | |
2139 | syscall enter. If we last single-stepped this thread, this | |
2140 | has to be a syscall exit. | |
2141 | ||
2142 | The points above mean that the next resume, be it PT_STEP or | |
2143 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
2144 | if (debug_linux_nat) | |
2145 | fprintf_unfiltered (gdb_stdlog, | |
2146 | "LHST: caught syscall event with no syscall catchpoints." | |
2147 | " %d for LWP %ld, ignoring\n", | |
2148 | syscall_number, | |
2149 | GET_LWP (lp->ptid)); | |
2150 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2151 | } | |
2152 | ||
2153 | /* The core isn't interested in this event. For efficiency, avoid | |
2154 | stopping all threads only to have the core resume them all again. | |
2155 | Since we're not stopping threads, if we're still syscall tracing | |
2156 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
2157 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
2158 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
2159 | ||
2160 | /* Note that gdbarch_get_syscall_number may access registers, hence | |
2161 | fill a regcache. */ | |
2162 | registers_changed (); | |
2163 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
2164 | lp->step, TARGET_SIGNAL_0); | |
2165 | return 1; | |
2166 | } | |
2167 | ||
3d799a95 DJ |
2168 | /* Handle a GNU/Linux extended wait response. If we see a clone |
2169 | event, we need to add the new LWP to our list (and not report the | |
2170 | trap to higher layers). This function returns non-zero if the | |
2171 | event should be ignored and we should wait again. If STOPPING is | |
2172 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
2173 | |
2174 | static int | |
3d799a95 DJ |
2175 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
2176 | int stopping) | |
d6b0e80f | 2177 | { |
3d799a95 DJ |
2178 | int pid = GET_LWP (lp->ptid); |
2179 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2180 | struct lwp_info *new_lp = NULL; | |
2181 | int event = status >> 16; | |
d6b0e80f | 2182 | |
3d799a95 DJ |
2183 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
2184 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 2185 | { |
3d799a95 DJ |
2186 | unsigned long new_pid; |
2187 | int ret; | |
2188 | ||
2189 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 2190 | |
3d799a95 DJ |
2191 | /* If we haven't already seen the new PID stop, wait for it now. */ |
2192 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
2193 | { | |
2194 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
2195 | hits the SIGSTOP, but we're already attached. */ | |
2196 | ret = my_waitpid (new_pid, &status, | |
2197 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
2198 | if (ret == -1) | |
2199 | perror_with_name (_("waiting for new child")); | |
2200 | else if (ret != new_pid) | |
2201 | internal_error (__FILE__, __LINE__, | |
2202 | _("wait returned unexpected PID %d"), ret); | |
2203 | else if (!WIFSTOPPED (status)) | |
2204 | internal_error (__FILE__, __LINE__, | |
2205 | _("wait returned unexpected status 0x%x"), status); | |
2206 | } | |
2207 | ||
3a3e9ee3 | 2208 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2209 | |
2277426b PA |
2210 | if (event == PTRACE_EVENT_FORK |
2211 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
2212 | { | |
2213 | struct fork_info *fp; | |
2214 | ||
2215 | /* Handle checkpointing by linux-fork.c here as a special | |
2216 | case. We don't want the follow-fork-mode or 'catch fork' | |
2217 | to interfere with this. */ | |
2218 | ||
2219 | /* This won't actually modify the breakpoint list, but will | |
2220 | physically remove the breakpoints from the child. */ | |
2221 | detach_breakpoints (new_pid); | |
2222 | ||
2223 | /* Retain child fork in ptrace (stopped) state. */ | |
2224 | fp = find_fork_pid (new_pid); | |
2225 | if (!fp) | |
2226 | fp = add_fork (new_pid); | |
2227 | ||
2228 | /* Report as spurious, so that infrun doesn't want to follow | |
2229 | this fork. We're actually doing an infcall in | |
2230 | linux-fork.c. */ | |
2231 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2232 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
2233 | ||
2234 | /* Report the stop to the core. */ | |
2235 | return 0; | |
2236 | } | |
2237 | ||
3d799a95 DJ |
2238 | if (event == PTRACE_EVENT_FORK) |
2239 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2240 | else if (event == PTRACE_EVENT_VFORK) | |
2241 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 2242 | else |
3d799a95 | 2243 | { |
4c28f408 PA |
2244 | struct cleanup *old_chain; |
2245 | ||
3d799a95 | 2246 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
d90e17a7 | 2247 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 2248 | new_lp->cloned = 1; |
4c28f408 | 2249 | new_lp->stopped = 1; |
d6b0e80f | 2250 | |
3d799a95 DJ |
2251 | if (WSTOPSIG (status) != SIGSTOP) |
2252 | { | |
2253 | /* This can happen if someone starts sending signals to | |
2254 | the new thread before it gets a chance to run, which | |
2255 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2256 | This is an unlikely case, and harder to handle for | |
2257 | fork / vfork than for clone, so we do not try - but | |
2258 | we handle it for clone events here. We'll send | |
2259 | the other signal on to the thread below. */ | |
2260 | ||
2261 | new_lp->signalled = 1; | |
2262 | } | |
2263 | else | |
2264 | status = 0; | |
d6b0e80f | 2265 | |
4c28f408 | 2266 | if (non_stop) |
3d799a95 | 2267 | { |
4c28f408 PA |
2268 | /* Add the new thread to GDB's lists as soon as possible |
2269 | so that: | |
2270 | ||
2271 | 1) the frontend doesn't have to wait for a stop to | |
2272 | display them, and, | |
2273 | ||
2274 | 2) we tag it with the correct running state. */ | |
2275 | ||
2276 | /* If the thread_db layer is active, let it know about | |
2277 | this new thread, and add it to GDB's list. */ | |
2278 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2279 | { | |
2280 | /* We're not using thread_db. Add it to GDB's | |
2281 | list. */ | |
2282 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2283 | add_thread (new_lp->ptid); | |
2284 | } | |
2285 | ||
2286 | if (!stopping) | |
2287 | { | |
2288 | set_running (new_lp->ptid, 1); | |
2289 | set_executing (new_lp->ptid, 1); | |
2290 | } | |
2291 | } | |
2292 | ||
ca2163eb PA |
2293 | /* Note the need to use the low target ops to resume, to |
2294 | handle resuming with PT_SYSCALL if we have syscall | |
2295 | catchpoints. */ | |
4c28f408 PA |
2296 | if (!stopping) |
2297 | { | |
ca2163eb PA |
2298 | int signo; |
2299 | ||
4c28f408 | 2300 | new_lp->stopped = 0; |
3d799a95 | 2301 | new_lp->resumed = 1; |
ca2163eb PA |
2302 | |
2303 | signo = (status | |
2304 | ? target_signal_from_host (WSTOPSIG (status)) | |
2305 | : TARGET_SIGNAL_0); | |
2306 | ||
2307 | linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid), | |
2308 | 0, signo); | |
3d799a95 | 2309 | } |
d6b0e80f | 2310 | |
3d799a95 DJ |
2311 | if (debug_linux_nat) |
2312 | fprintf_unfiltered (gdb_stdlog, | |
2313 | "LHEW: Got clone event from LWP %ld, resuming\n", | |
2314 | GET_LWP (lp->ptid)); | |
ca2163eb PA |
2315 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
2316 | 0, TARGET_SIGNAL_0); | |
3d799a95 DJ |
2317 | |
2318 | return 1; | |
2319 | } | |
2320 | ||
2321 | return 0; | |
d6b0e80f AC |
2322 | } |
2323 | ||
3d799a95 DJ |
2324 | if (event == PTRACE_EVENT_EXEC) |
2325 | { | |
a75724bc PA |
2326 | if (debug_linux_nat) |
2327 | fprintf_unfiltered (gdb_stdlog, | |
2328 | "LHEW: Got exec event from LWP %ld\n", | |
2329 | GET_LWP (lp->ptid)); | |
2330 | ||
3d799a95 DJ |
2331 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2332 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2333 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 | 2334 | |
6c95b8df PA |
2335 | return 0; |
2336 | } | |
2337 | ||
2338 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2339 | { | |
2340 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2341 | { |
6c95b8df PA |
2342 | if (debug_linux_nat) |
2343 | fprintf_unfiltered (gdb_stdlog, "\ | |
2344 | LHEW: Got expected PTRACE_EVENT_VFORK_DONE from LWP %ld: stopping\n", | |
2345 | GET_LWP (lp->ptid)); | |
3d799a95 | 2346 | |
6c95b8df PA |
2347 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2348 | return 0; | |
3d799a95 DJ |
2349 | } |
2350 | ||
6c95b8df PA |
2351 | if (debug_linux_nat) |
2352 | fprintf_unfiltered (gdb_stdlog, "\ | |
2353 | LHEW: Got PTRACE_EVENT_VFORK_DONE from LWP %ld: resuming\n", | |
2354 | GET_LWP (lp->ptid)); | |
2355 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2356 | return 1; | |
3d799a95 DJ |
2357 | } |
2358 | ||
2359 | internal_error (__FILE__, __LINE__, | |
2360 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2361 | } |
2362 | ||
2363 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
2364 | exited. */ | |
2365 | ||
2366 | static int | |
2367 | wait_lwp (struct lwp_info *lp) | |
2368 | { | |
2369 | pid_t pid; | |
2370 | int status; | |
2371 | int thread_dead = 0; | |
2372 | ||
2373 | gdb_assert (!lp->stopped); | |
2374 | gdb_assert (lp->status == 0); | |
2375 | ||
58aecb61 | 2376 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
2377 | if (pid == -1 && errno == ECHILD) |
2378 | { | |
58aecb61 | 2379 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
2380 | if (pid == -1 && errno == ECHILD) |
2381 | { | |
2382 | /* The thread has previously exited. We need to delete it | |
2383 | now because, for some vendor 2.4 kernels with NPTL | |
2384 | support backported, there won't be an exit event unless | |
2385 | it is the main thread. 2.6 kernels will report an exit | |
2386 | event for each thread that exits, as expected. */ | |
2387 | thread_dead = 1; | |
2388 | if (debug_linux_nat) | |
2389 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2390 | target_pid_to_str (lp->ptid)); | |
2391 | } | |
2392 | } | |
2393 | ||
2394 | if (!thread_dead) | |
2395 | { | |
2396 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2397 | ||
2398 | if (debug_linux_nat) | |
2399 | { | |
2400 | fprintf_unfiltered (gdb_stdlog, | |
2401 | "WL: waitpid %s received %s\n", | |
2402 | target_pid_to_str (lp->ptid), | |
2403 | status_to_str (status)); | |
2404 | } | |
2405 | } | |
2406 | ||
2407 | /* Check if the thread has exited. */ | |
2408 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2409 | { | |
2410 | thread_dead = 1; | |
2411 | if (debug_linux_nat) | |
2412 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2413 | target_pid_to_str (lp->ptid)); | |
2414 | } | |
2415 | ||
2416 | if (thread_dead) | |
2417 | { | |
e26af52f | 2418 | exit_lwp (lp); |
d6b0e80f AC |
2419 | return 0; |
2420 | } | |
2421 | ||
2422 | gdb_assert (WIFSTOPPED (status)); | |
2423 | ||
ca2163eb PA |
2424 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2425 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2426 | { | |
2427 | /* No longer need the sysgood bit. The ptrace event ends up | |
2428 | recorded in lp->waitstatus if we care for it. We can carry | |
2429 | on handling the event like a regular SIGTRAP from here | |
2430 | on. */ | |
2431 | status = W_STOPCODE (SIGTRAP); | |
2432 | if (linux_handle_syscall_trap (lp, 1)) | |
2433 | return wait_lwp (lp); | |
2434 | } | |
2435 | ||
d6b0e80f AC |
2436 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
2437 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2438 | { | |
2439 | if (debug_linux_nat) | |
2440 | fprintf_unfiltered (gdb_stdlog, | |
2441 | "WL: Handling extended status 0x%06x\n", | |
2442 | status); | |
3d799a95 | 2443 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2444 | return wait_lwp (lp); |
2445 | } | |
2446 | ||
2447 | return status; | |
2448 | } | |
2449 | ||
9f0bdab8 DJ |
2450 | /* Save the most recent siginfo for LP. This is currently only called |
2451 | for SIGTRAP; some ports use the si_addr field for | |
2452 | target_stopped_data_address. In the future, it may also be used to | |
2453 | restore the siginfo of requeued signals. */ | |
2454 | ||
2455 | static void | |
2456 | save_siginfo (struct lwp_info *lp) | |
2457 | { | |
2458 | errno = 0; | |
2459 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2460 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2461 | ||
2462 | if (errno != 0) | |
2463 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2464 | } | |
2465 | ||
d6b0e80f AC |
2466 | /* Send a SIGSTOP to LP. */ |
2467 | ||
2468 | static int | |
2469 | stop_callback (struct lwp_info *lp, void *data) | |
2470 | { | |
2471 | if (!lp->stopped && !lp->signalled) | |
2472 | { | |
2473 | int ret; | |
2474 | ||
2475 | if (debug_linux_nat) | |
2476 | { | |
2477 | fprintf_unfiltered (gdb_stdlog, | |
2478 | "SC: kill %s **<SIGSTOP>**\n", | |
2479 | target_pid_to_str (lp->ptid)); | |
2480 | } | |
2481 | errno = 0; | |
2482 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2483 | if (debug_linux_nat) | |
2484 | { | |
2485 | fprintf_unfiltered (gdb_stdlog, | |
2486 | "SC: lwp kill %d %s\n", | |
2487 | ret, | |
2488 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2489 | } | |
2490 | ||
2491 | lp->signalled = 1; | |
2492 | gdb_assert (lp->status == 0); | |
2493 | } | |
2494 | ||
2495 | return 0; | |
2496 | } | |
2497 | ||
57380f4e | 2498 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2499 | |
2500 | static int | |
57380f4e DJ |
2501 | linux_nat_has_pending_sigint (int pid) |
2502 | { | |
2503 | sigset_t pending, blocked, ignored; | |
2504 | int i; | |
2505 | ||
2506 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2507 | ||
2508 | if (sigismember (&pending, SIGINT) | |
2509 | && !sigismember (&ignored, SIGINT)) | |
2510 | return 1; | |
2511 | ||
2512 | return 0; | |
2513 | } | |
2514 | ||
2515 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2516 | ||
2517 | static int | |
2518 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2519 | { |
57380f4e DJ |
2520 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2521 | flag to consume the next one. */ | |
2522 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2523 | && WSTOPSIG (lp->status) == SIGINT) | |
2524 | lp->status = 0; | |
2525 | else | |
2526 | lp->ignore_sigint = 1; | |
2527 | ||
2528 | return 0; | |
2529 | } | |
2530 | ||
2531 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2532 | This function is called after we know the LWP has stopped; if the LWP | |
2533 | stopped before the expected SIGINT was delivered, then it will never have | |
2534 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2535 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2536 | |
57380f4e DJ |
2537 | static void |
2538 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2539 | { | |
2540 | if (!lp->ignore_sigint) | |
2541 | return; | |
2542 | ||
2543 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2544 | { | |
2545 | if (debug_linux_nat) | |
2546 | fprintf_unfiltered (gdb_stdlog, | |
2547 | "MCIS: Clearing bogus flag for %s\n", | |
2548 | target_pid_to_str (lp->ptid)); | |
2549 | lp->ignore_sigint = 0; | |
2550 | } | |
2551 | } | |
2552 | ||
ebec9a0f PA |
2553 | /* Fetch the possible triggered data watchpoint info and store it in |
2554 | LP. | |
2555 | ||
2556 | On some archs, like x86, that use debug registers to set | |
2557 | watchpoints, it's possible that the way to know which watched | |
2558 | address trapped, is to check the register that is used to select | |
2559 | which address to watch. Problem is, between setting the watchpoint | |
2560 | and reading back which data address trapped, the user may change | |
2561 | the set of watchpoints, and, as a consequence, GDB changes the | |
2562 | debug registers in the inferior. To avoid reading back a stale | |
2563 | stopped-data-address when that happens, we cache in LP the fact | |
2564 | that a watchpoint trapped, and the corresponding data address, as | |
2565 | soon as we see LP stop with a SIGTRAP. If GDB changes the debug | |
2566 | registers meanwhile, we have the cached data we can rely on. */ | |
2567 | ||
2568 | static void | |
2569 | save_sigtrap (struct lwp_info *lp) | |
2570 | { | |
2571 | struct cleanup *old_chain; | |
2572 | ||
2573 | if (linux_ops->to_stopped_by_watchpoint == NULL) | |
2574 | { | |
2575 | lp->stopped_by_watchpoint = 0; | |
2576 | return; | |
2577 | } | |
2578 | ||
2579 | old_chain = save_inferior_ptid (); | |
2580 | inferior_ptid = lp->ptid; | |
2581 | ||
2582 | lp->stopped_by_watchpoint = linux_ops->to_stopped_by_watchpoint (); | |
2583 | ||
2584 | if (lp->stopped_by_watchpoint) | |
2585 | { | |
2586 | if (linux_ops->to_stopped_data_address != NULL) | |
2587 | lp->stopped_data_address_p = | |
2588 | linux_ops->to_stopped_data_address (¤t_target, | |
2589 | &lp->stopped_data_address); | |
2590 | else | |
2591 | lp->stopped_data_address_p = 0; | |
2592 | } | |
2593 | ||
2594 | do_cleanups (old_chain); | |
2595 | } | |
2596 | ||
2597 | /* See save_sigtrap. */ | |
2598 | ||
2599 | static int | |
2600 | linux_nat_stopped_by_watchpoint (void) | |
2601 | { | |
2602 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2603 | ||
2604 | gdb_assert (lp != NULL); | |
2605 | ||
2606 | return lp->stopped_by_watchpoint; | |
2607 | } | |
2608 | ||
2609 | static int | |
2610 | linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) | |
2611 | { | |
2612 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2613 | ||
2614 | gdb_assert (lp != NULL); | |
2615 | ||
2616 | *addr_p = lp->stopped_data_address; | |
2617 | ||
2618 | return lp->stopped_data_address_p; | |
2619 | } | |
2620 | ||
57380f4e DJ |
2621 | /* Wait until LP is stopped. */ |
2622 | ||
2623 | static int | |
2624 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2625 | { | |
6c95b8df PA |
2626 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
2627 | ||
2628 | /* If this is a vfork parent, bail out, it is not going to report | |
2629 | any SIGSTOP until the vfork is done with. */ | |
2630 | if (inf->vfork_child != NULL) | |
2631 | return 0; | |
2632 | ||
d6b0e80f AC |
2633 | if (!lp->stopped) |
2634 | { | |
2635 | int status; | |
2636 | ||
2637 | status = wait_lwp (lp); | |
2638 | if (status == 0) | |
2639 | return 0; | |
2640 | ||
57380f4e DJ |
2641 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2642 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2643 | { |
57380f4e | 2644 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2645 | |
2646 | errno = 0; | |
2647 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2648 | if (debug_linux_nat) | |
2649 | fprintf_unfiltered (gdb_stdlog, | |
57380f4e | 2650 | "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n", |
d6b0e80f AC |
2651 | target_pid_to_str (lp->ptid), |
2652 | errno ? safe_strerror (errno) : "OK"); | |
2653 | ||
57380f4e | 2654 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2655 | } |
2656 | ||
57380f4e DJ |
2657 | maybe_clear_ignore_sigint (lp); |
2658 | ||
d6b0e80f AC |
2659 | if (WSTOPSIG (status) != SIGSTOP) |
2660 | { | |
2661 | if (WSTOPSIG (status) == SIGTRAP) | |
2662 | { | |
2663 | /* If a LWP other than the LWP that we're reporting an | |
2664 | event for has hit a GDB breakpoint (as opposed to | |
2665 | some random trap signal), then just arrange for it to | |
2666 | hit it again later. We don't keep the SIGTRAP status | |
2667 | and don't forward the SIGTRAP signal to the LWP. We | |
2668 | will handle the current event, eventually we will | |
2669 | resume all LWPs, and this one will get its breakpoint | |
2670 | trap again. | |
2671 | ||
2672 | If we do not do this, then we run the risk that the | |
2673 | user will delete or disable the breakpoint, but the | |
2674 | thread will have already tripped on it. */ | |
2675 | ||
9f0bdab8 DJ |
2676 | /* Save the trap's siginfo in case we need it later. */ |
2677 | save_siginfo (lp); | |
2678 | ||
ebec9a0f PA |
2679 | save_sigtrap (lp); |
2680 | ||
d6b0e80f AC |
2681 | /* Now resume this LWP and get the SIGSTOP event. */ |
2682 | errno = 0; | |
2683 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2684 | if (debug_linux_nat) | |
2685 | { | |
2686 | fprintf_unfiltered (gdb_stdlog, | |
2687 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2688 | target_pid_to_str (lp->ptid), | |
2689 | errno ? safe_strerror (errno) : "OK"); | |
2690 | ||
2691 | fprintf_unfiltered (gdb_stdlog, | |
2692 | "SWC: Candidate SIGTRAP event in %s\n", | |
2693 | target_pid_to_str (lp->ptid)); | |
2694 | } | |
710151dd PA |
2695 | /* Hold this event/waitstatus while we check to see if |
2696 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2697 | stop_wait_callback (lp, NULL); |
710151dd | 2698 | |
7feb7d06 PA |
2699 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2700 | there's another event, throw it back into the | |
2701 | queue. */ | |
2702 | if (lp->status) | |
710151dd | 2703 | { |
7feb7d06 PA |
2704 | if (debug_linux_nat) |
2705 | fprintf_unfiltered (gdb_stdlog, | |
2706 | "SWC: kill %s, %s\n", | |
2707 | target_pid_to_str (lp->ptid), | |
2708 | status_to_str ((int) status)); | |
2709 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2710 | } |
7feb7d06 PA |
2711 | |
2712 | /* Save the sigtrap event. */ | |
2713 | lp->status = status; | |
d6b0e80f AC |
2714 | return 0; |
2715 | } | |
2716 | else | |
2717 | { | |
2718 | /* The thread was stopped with a signal other than | |
2719 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
2720 | ||
2721 | if (debug_linux_nat) | |
2722 | { | |
2723 | fprintf_unfiltered (gdb_stdlog, | |
2724 | "SWC: Pending event %s in %s\n", | |
2725 | status_to_str ((int) status), | |
2726 | target_pid_to_str (lp->ptid)); | |
2727 | } | |
2728 | /* Now resume this LWP and get the SIGSTOP event. */ | |
2729 | errno = 0; | |
2730 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2731 | if (debug_linux_nat) | |
2732 | fprintf_unfiltered (gdb_stdlog, | |
2733 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2734 | target_pid_to_str (lp->ptid), | |
2735 | errno ? safe_strerror (errno) : "OK"); | |
2736 | ||
2737 | /* Hold this event/waitstatus while we check to see if | |
2738 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2739 | stop_wait_callback (lp, NULL); |
710151dd PA |
2740 | |
2741 | /* If the lp->status field is still empty, use it to | |
2742 | hold this event. If not, then this event must be | |
2743 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2744 | if (lp->status) |
d6b0e80f AC |
2745 | { |
2746 | if (debug_linux_nat) | |
2747 | { | |
2748 | fprintf_unfiltered (gdb_stdlog, | |
2749 | "SWC: kill %s, %s\n", | |
2750 | target_pid_to_str (lp->ptid), | |
2751 | status_to_str ((int) status)); | |
2752 | } | |
2753 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2754 | } | |
710151dd PA |
2755 | else |
2756 | lp->status = status; | |
d6b0e80f AC |
2757 | return 0; |
2758 | } | |
2759 | } | |
2760 | else | |
2761 | { | |
2762 | /* We caught the SIGSTOP that we intended to catch, so | |
2763 | there's no SIGSTOP pending. */ | |
2764 | lp->stopped = 1; | |
2765 | lp->signalled = 0; | |
2766 | } | |
2767 | } | |
2768 | ||
2769 | return 0; | |
2770 | } | |
2771 | ||
d6b0e80f AC |
2772 | /* Return non-zero if LP has a wait status pending. */ |
2773 | ||
2774 | static int | |
2775 | status_callback (struct lwp_info *lp, void *data) | |
2776 | { | |
2777 | /* Only report a pending wait status if we pretend that this has | |
2778 | indeed been resumed. */ | |
ca2163eb PA |
2779 | if (!lp->resumed) |
2780 | return 0; | |
2781 | ||
2782 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2783 | { | |
2784 | /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event, | |
2785 | or a a pending process exit. Note that `W_EXITCODE(0,0) == | |
2786 | 0', so a clean process exit can not be stored pending in | |
2787 | lp->status, it is indistinguishable from | |
2788 | no-pending-status. */ | |
2789 | return 1; | |
2790 | } | |
2791 | ||
2792 | if (lp->status != 0) | |
2793 | return 1; | |
2794 | ||
2795 | return 0; | |
d6b0e80f AC |
2796 | } |
2797 | ||
2798 | /* Return non-zero if LP isn't stopped. */ | |
2799 | ||
2800 | static int | |
2801 | running_callback (struct lwp_info *lp, void *data) | |
2802 | { | |
2803 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2804 | } | |
2805 | ||
2806 | /* Count the LWP's that have had events. */ | |
2807 | ||
2808 | static int | |
2809 | count_events_callback (struct lwp_info *lp, void *data) | |
2810 | { | |
2811 | int *count = data; | |
2812 | ||
2813 | gdb_assert (count != NULL); | |
2814 | ||
e09490f1 DJ |
2815 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
2816 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2817 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2818 | (*count)++; | |
2819 | ||
2820 | return 0; | |
2821 | } | |
2822 | ||
2823 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2824 | ||
2825 | static int | |
2826 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2827 | { | |
2828 | if (lp->step && lp->status != 0) | |
2829 | return 1; | |
2830 | else | |
2831 | return 0; | |
2832 | } | |
2833 | ||
2834 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2835 | ||
2836 | static int | |
2837 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2838 | { | |
2839 | int *selector = data; | |
2840 | ||
2841 | gdb_assert (selector != NULL); | |
2842 | ||
e09490f1 DJ |
2843 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
2844 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2845 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2846 | if ((*selector)-- == 0) | |
2847 | return 1; | |
2848 | ||
2849 | return 0; | |
2850 | } | |
2851 | ||
710151dd PA |
2852 | static int |
2853 | cancel_breakpoint (struct lwp_info *lp) | |
2854 | { | |
2855 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2856 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2857 | LWP. We will handle the current event, eventually we will resume | |
2858 | this LWP, and this breakpoint will trap again. | |
2859 | ||
2860 | If we do not do this, then we run the risk that the user will | |
2861 | delete or disable the breakpoint, but the LWP will have already | |
2862 | tripped on it. */ | |
2863 | ||
515630c5 UW |
2864 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2865 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2866 | CORE_ADDR pc; | |
2867 | ||
2868 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
6c95b8df | 2869 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
710151dd PA |
2870 | { |
2871 | if (debug_linux_nat) | |
2872 | fprintf_unfiltered (gdb_stdlog, | |
2873 | "CB: Push back breakpoint for %s\n", | |
2874 | target_pid_to_str (lp->ptid)); | |
2875 | ||
2876 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2877 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2878 | regcache_write_pc (regcache, pc); | |
2879 | ||
710151dd PA |
2880 | return 1; |
2881 | } | |
2882 | return 0; | |
2883 | } | |
2884 | ||
d6b0e80f AC |
2885 | static int |
2886 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2887 | { | |
2888 | struct lwp_info *event_lp = data; | |
2889 | ||
2890 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2891 | if (lp == event_lp) | |
2892 | return 0; | |
2893 | ||
2894 | /* If a LWP other than the LWP that we're reporting an event for has | |
2895 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2896 | then just arrange for it to hit it again later. We don't keep | |
2897 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2898 | LWP. We will handle the current event, eventually we will resume | |
2899 | all LWPs, and this one will get its breakpoint trap again. | |
2900 | ||
2901 | If we do not do this, then we run the risk that the user will | |
2902 | delete or disable the breakpoint, but the LWP will have already | |
2903 | tripped on it. */ | |
2904 | ||
ca2163eb PA |
2905 | if (lp->waitstatus.kind == TARGET_WAITKIND_IGNORE |
2906 | && lp->status != 0 | |
d6b0e80f | 2907 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP |
710151dd PA |
2908 | && cancel_breakpoint (lp)) |
2909 | /* Throw away the SIGTRAP. */ | |
2910 | lp->status = 0; | |
d6b0e80f AC |
2911 | |
2912 | return 0; | |
2913 | } | |
2914 | ||
2915 | /* Select one LWP out of those that have events pending. */ | |
2916 | ||
2917 | static void | |
d90e17a7 | 2918 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
2919 | { |
2920 | int num_events = 0; | |
2921 | int random_selector; | |
2922 | struct lwp_info *event_lp; | |
2923 | ||
ac264b3b | 2924 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2925 | (*orig_lp)->status = *status; |
2926 | ||
2927 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
2928 | event_lp = iterate_over_lwps (filter, |
2929 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
2930 | if (event_lp != NULL) |
2931 | { | |
2932 | if (debug_linux_nat) | |
2933 | fprintf_unfiltered (gdb_stdlog, | |
2934 | "SEL: Select single-step %s\n", | |
2935 | target_pid_to_str (event_lp->ptid)); | |
2936 | } | |
2937 | else | |
2938 | { | |
2939 | /* No single-stepping LWP. Select one at random, out of those | |
2940 | which have had SIGTRAP events. */ | |
2941 | ||
2942 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 2943 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
2944 | |
2945 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2946 | random_selector = (int) | |
2947 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2948 | ||
2949 | if (debug_linux_nat && num_events > 1) | |
2950 | fprintf_unfiltered (gdb_stdlog, | |
2951 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2952 | num_events, random_selector); | |
2953 | ||
d90e17a7 PA |
2954 | event_lp = iterate_over_lwps (filter, |
2955 | select_event_lwp_callback, | |
d6b0e80f AC |
2956 | &random_selector); |
2957 | } | |
2958 | ||
2959 | if (event_lp != NULL) | |
2960 | { | |
2961 | /* Switch the event LWP. */ | |
2962 | *orig_lp = event_lp; | |
2963 | *status = event_lp->status; | |
2964 | } | |
2965 | ||
2966 | /* Flush the wait status for the event LWP. */ | |
2967 | (*orig_lp)->status = 0; | |
2968 | } | |
2969 | ||
2970 | /* Return non-zero if LP has been resumed. */ | |
2971 | ||
2972 | static int | |
2973 | resumed_callback (struct lwp_info *lp, void *data) | |
2974 | { | |
2975 | return lp->resumed; | |
2976 | } | |
2977 | ||
d6b0e80f AC |
2978 | /* Stop an active thread, verify it still exists, then resume it. */ |
2979 | ||
2980 | static int | |
2981 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
2982 | { | |
2983 | struct lwp_info *ptr; | |
2984 | ||
2985 | if (!lp->stopped && !lp->signalled) | |
2986 | { | |
2987 | stop_callback (lp, NULL); | |
2988 | stop_wait_callback (lp, NULL); | |
2989 | /* Resume if the lwp still exists. */ | |
2990 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
2991 | if (lp == ptr) | |
2992 | { | |
2993 | resume_callback (lp, NULL); | |
2994 | resume_set_callback (lp, NULL); | |
2995 | } | |
2996 | } | |
2997 | return 0; | |
2998 | } | |
2999 | ||
02f3fc28 | 3000 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 3001 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
3002 | static struct lwp_info * |
3003 | linux_nat_filter_event (int lwpid, int status, int options) | |
3004 | { | |
3005 | struct lwp_info *lp; | |
3006 | ||
3007 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
3008 | ||
3009 | /* Check for stop events reported by a process we didn't already | |
3010 | know about - anything not already in our LWP list. | |
3011 | ||
3012 | If we're expecting to receive stopped processes after | |
3013 | fork, vfork, and clone events, then we'll just add the | |
3014 | new one to our list and go back to waiting for the event | |
3015 | to be reported - the stopped process might be returned | |
3016 | from waitpid before or after the event is. */ | |
3017 | if (WIFSTOPPED (status) && !lp) | |
3018 | { | |
3019 | linux_record_stopped_pid (lwpid, status); | |
3020 | return NULL; | |
3021 | } | |
3022 | ||
3023 | /* Make sure we don't report an event for the exit of an LWP not in | |
3024 | our list, i.e. not part of the current process. This can happen | |
3025 | if we detach from a program we original forked and then it | |
3026 | exits. */ | |
3027 | if (!WIFSTOPPED (status) && !lp) | |
3028 | return NULL; | |
3029 | ||
3030 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
3031 | CLONE_PTRACE processes which do not use the thread library - | |
3032 | otherwise we wouldn't find the new LWP this way. That doesn't | |
3033 | currently work, and the following code is currently unreachable | |
3034 | due to the two blocks above. If it's fixed some day, this code | |
3035 | should be broken out into a function so that we can also pick up | |
3036 | LWPs from the new interface. */ | |
3037 | if (!lp) | |
3038 | { | |
3039 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
3040 | if (options & __WCLONE) | |
3041 | lp->cloned = 1; | |
3042 | ||
3043 | gdb_assert (WIFSTOPPED (status) | |
3044 | && WSTOPSIG (status) == SIGSTOP); | |
3045 | lp->signalled = 1; | |
3046 | ||
3047 | if (!in_thread_list (inferior_ptid)) | |
3048 | { | |
3049 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
3050 | GET_PID (inferior_ptid)); | |
3051 | add_thread (inferior_ptid); | |
3052 | } | |
3053 | ||
3054 | add_thread (lp->ptid); | |
3055 | } | |
3056 | ||
ca2163eb PA |
3057 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3058 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3059 | { | |
3060 | /* No longer need the sysgood bit. The ptrace event ends up | |
3061 | recorded in lp->waitstatus if we care for it. We can carry | |
3062 | on handling the event like a regular SIGTRAP from here | |
3063 | on. */ | |
3064 | status = W_STOPCODE (SIGTRAP); | |
3065 | if (linux_handle_syscall_trap (lp, 0)) | |
3066 | return NULL; | |
3067 | } | |
02f3fc28 | 3068 | |
ca2163eb PA |
3069 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
3070 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
02f3fc28 PA |
3071 | { |
3072 | if (debug_linux_nat) | |
3073 | fprintf_unfiltered (gdb_stdlog, | |
3074 | "LLW: Handling extended status 0x%06x\n", | |
3075 | status); | |
3076 | if (linux_handle_extended_wait (lp, status, 0)) | |
3077 | return NULL; | |
3078 | } | |
3079 | ||
ca2163eb | 3080 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) |
ebec9a0f PA |
3081 | { |
3082 | /* Save the trap's siginfo in case we need it later. */ | |
3083 | save_siginfo (lp); | |
3084 | ||
3085 | save_sigtrap (lp); | |
3086 | } | |
ca2163eb | 3087 | |
02f3fc28 | 3088 | /* Check if the thread has exited. */ |
d90e17a7 PA |
3089 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
3090 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 3091 | { |
9db03742 JB |
3092 | /* If this is the main thread, we must stop all threads and verify |
3093 | if they are still alive. This is because in the nptl thread model | |
3094 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
3095 | other than the main thread. We only get the main thread exit |
3096 | signal once all child threads have already exited. If we | |
3097 | stop all the threads and use the stop_wait_callback to check | |
3098 | if they have exited we can determine whether this signal | |
3099 | should be ignored or whether it means the end of the debugged | |
3100 | application, regardless of which threading model is being | |
5d3b6af6 | 3101 | used. */ |
02f3fc28 PA |
3102 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
3103 | { | |
3104 | lp->stopped = 1; | |
d90e17a7 PA |
3105 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
3106 | stop_and_resume_callback, NULL); | |
02f3fc28 PA |
3107 | } |
3108 | ||
3109 | if (debug_linux_nat) | |
3110 | fprintf_unfiltered (gdb_stdlog, | |
3111 | "LLW: %s exited.\n", | |
3112 | target_pid_to_str (lp->ptid)); | |
3113 | ||
d90e17a7 | 3114 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
3115 | { |
3116 | /* If there is at least one more LWP, then the exit signal | |
3117 | was not the end of the debugged application and should be | |
3118 | ignored. */ | |
3119 | exit_lwp (lp); | |
3120 | return NULL; | |
3121 | } | |
02f3fc28 PA |
3122 | } |
3123 | ||
3124 | /* Check if the current LWP has previously exited. In the nptl | |
3125 | thread model, LWPs other than the main thread do not issue | |
3126 | signals when they exit so we must check whenever the thread has | |
3127 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 3128 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 3129 | { |
d90e17a7 PA |
3130 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
3131 | ||
02f3fc28 PA |
3132 | if (debug_linux_nat) |
3133 | fprintf_unfiltered (gdb_stdlog, | |
3134 | "LLW: %s exited.\n", | |
3135 | target_pid_to_str (lp->ptid)); | |
3136 | ||
3137 | exit_lwp (lp); | |
3138 | ||
3139 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 3140 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
3141 | |
3142 | /* Discard the event. */ | |
3143 | return NULL; | |
3144 | } | |
3145 | ||
3146 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
3147 | an attempt to stop an LWP. */ | |
3148 | if (lp->signalled | |
3149 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3150 | { | |
3151 | if (debug_linux_nat) | |
3152 | fprintf_unfiltered (gdb_stdlog, | |
3153 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
3154 | target_pid_to_str (lp->ptid)); | |
3155 | ||
3156 | /* This is a delayed SIGSTOP. */ | |
3157 | lp->signalled = 0; | |
3158 | ||
3159 | registers_changed (); | |
3160 | ||
28439f5e | 3161 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
02f3fc28 PA |
3162 | lp->step, TARGET_SIGNAL_0); |
3163 | if (debug_linux_nat) | |
3164 | fprintf_unfiltered (gdb_stdlog, | |
3165 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
3166 | lp->step ? | |
3167 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3168 | target_pid_to_str (lp->ptid)); | |
3169 | ||
3170 | lp->stopped = 0; | |
3171 | gdb_assert (lp->resumed); | |
3172 | ||
3173 | /* Discard the event. */ | |
3174 | return NULL; | |
3175 | } | |
3176 | ||
57380f4e DJ |
3177 | /* Make sure we don't report a SIGINT that we have already displayed |
3178 | for another thread. */ | |
3179 | if (lp->ignore_sigint | |
3180 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3181 | { | |
3182 | if (debug_linux_nat) | |
3183 | fprintf_unfiltered (gdb_stdlog, | |
3184 | "LLW: Delayed SIGINT caught for %s.\n", | |
3185 | target_pid_to_str (lp->ptid)); | |
3186 | ||
3187 | /* This is a delayed SIGINT. */ | |
3188 | lp->ignore_sigint = 0; | |
3189 | ||
3190 | registers_changed (); | |
28439f5e | 3191 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
3192 | lp->step, TARGET_SIGNAL_0); |
3193 | if (debug_linux_nat) | |
3194 | fprintf_unfiltered (gdb_stdlog, | |
3195 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3196 | lp->step ? | |
3197 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3198 | target_pid_to_str (lp->ptid)); | |
3199 | ||
3200 | lp->stopped = 0; | |
3201 | gdb_assert (lp->resumed); | |
3202 | ||
3203 | /* Discard the event. */ | |
3204 | return NULL; | |
3205 | } | |
3206 | ||
02f3fc28 PA |
3207 | /* An interesting event. */ |
3208 | gdb_assert (lp); | |
ca2163eb | 3209 | lp->status = status; |
02f3fc28 PA |
3210 | return lp; |
3211 | } | |
3212 | ||
d6b0e80f | 3213 | static ptid_t |
7feb7d06 | 3214 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3215 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3216 | int target_options) | |
d6b0e80f | 3217 | { |
7feb7d06 | 3218 | static sigset_t prev_mask; |
d6b0e80f AC |
3219 | struct lwp_info *lp = NULL; |
3220 | int options = 0; | |
3221 | int status = 0; | |
d90e17a7 | 3222 | pid_t pid; |
d6b0e80f | 3223 | |
b84876c2 PA |
3224 | if (debug_linux_nat_async) |
3225 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); | |
3226 | ||
f973ed9c DJ |
3227 | /* The first time we get here after starting a new inferior, we may |
3228 | not have added it to the LWP list yet - this is the earliest | |
3229 | moment at which we know its PID. */ | |
d90e17a7 | 3230 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3231 | { |
27c9d204 PA |
3232 | /* Upgrade the main thread's ptid. */ |
3233 | thread_change_ptid (inferior_ptid, | |
3234 | BUILD_LWP (GET_PID (inferior_ptid), | |
3235 | GET_PID (inferior_ptid))); | |
3236 | ||
f973ed9c DJ |
3237 | lp = add_lwp (inferior_ptid); |
3238 | lp->resumed = 1; | |
3239 | } | |
3240 | ||
7feb7d06 PA |
3241 | /* Make sure SIGCHLD is blocked. */ |
3242 | block_child_signals (&prev_mask); | |
d6b0e80f | 3243 | |
d90e17a7 PA |
3244 | if (ptid_equal (ptid, minus_one_ptid)) |
3245 | pid = -1; | |
3246 | else if (ptid_is_pid (ptid)) | |
3247 | /* A request to wait for a specific tgid. This is not possible | |
3248 | with waitpid, so instead, we wait for any child, and leave | |
3249 | children we're not interested in right now with a pending | |
3250 | status to report later. */ | |
3251 | pid = -1; | |
3252 | else | |
3253 | pid = GET_LWP (ptid); | |
3254 | ||
d6b0e80f | 3255 | retry: |
d90e17a7 PA |
3256 | lp = NULL; |
3257 | status = 0; | |
d6b0e80f | 3258 | |
e3e9f5a2 PA |
3259 | /* Make sure that of those LWPs we want to get an event from, there |
3260 | is at least one LWP that has been resumed. If there's none, just | |
3261 | bail out. The core may just be flushing asynchronously all | |
3262 | events. */ | |
3263 | if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL) | |
3264 | { | |
3265 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3266 | ||
3267 | if (debug_linux_nat_async) | |
3268 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n"); | |
3269 | ||
3270 | restore_child_signals_mask (&prev_mask); | |
3271 | return minus_one_ptid; | |
3272 | } | |
d6b0e80f AC |
3273 | |
3274 | /* First check if there is a LWP with a wait status pending. */ | |
3275 | if (pid == -1) | |
3276 | { | |
3277 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 3278 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
3279 | if (lp) |
3280 | { | |
ca2163eb | 3281 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3282 | fprintf_unfiltered (gdb_stdlog, |
3283 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3284 | status_to_str (lp->status), |
d6b0e80f AC |
3285 | target_pid_to_str (lp->ptid)); |
3286 | } | |
3287 | ||
b84876c2 | 3288 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
3289 | cloned and uncloned processes. We start with the cloned |
3290 | processes. */ | |
d6b0e80f AC |
3291 | options = __WCLONE | WNOHANG; |
3292 | } | |
3293 | else if (is_lwp (ptid)) | |
3294 | { | |
3295 | if (debug_linux_nat) | |
3296 | fprintf_unfiltered (gdb_stdlog, | |
3297 | "LLW: Waiting for specific LWP %s.\n", | |
3298 | target_pid_to_str (ptid)); | |
3299 | ||
3300 | /* We have a specific LWP to check. */ | |
3301 | lp = find_lwp_pid (ptid); | |
3302 | gdb_assert (lp); | |
d6b0e80f | 3303 | |
ca2163eb | 3304 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3305 | fprintf_unfiltered (gdb_stdlog, |
3306 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3307 | status_to_str (lp->status), |
d6b0e80f AC |
3308 | target_pid_to_str (lp->ptid)); |
3309 | ||
3310 | /* If we have to wait, take into account whether PID is a cloned | |
3311 | process or not. And we have to convert it to something that | |
3312 | the layer beneath us can understand. */ | |
3313 | options = lp->cloned ? __WCLONE : 0; | |
3314 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
3315 | |
3316 | /* We check for lp->waitstatus in addition to lp->status, | |
3317 | because we can have pending process exits recorded in | |
3318 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
3319 | an additional lp->status_p flag. */ | |
ca2163eb | 3320 | if (lp->status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) |
d90e17a7 | 3321 | lp = NULL; |
d6b0e80f AC |
3322 | } |
3323 | ||
d90e17a7 | 3324 | if (lp && lp->signalled) |
d6b0e80f AC |
3325 | { |
3326 | /* A pending SIGSTOP may interfere with the normal stream of | |
3327 | events. In a typical case where interference is a problem, | |
3328 | we have a SIGSTOP signal pending for LWP A while | |
3329 | single-stepping it, encounter an event in LWP B, and take the | |
3330 | pending SIGSTOP while trying to stop LWP A. After processing | |
3331 | the event in LWP B, LWP A is continued, and we'll never see | |
3332 | the SIGTRAP associated with the last time we were | |
3333 | single-stepping LWP A. */ | |
3334 | ||
3335 | /* Resume the thread. It should halt immediately returning the | |
3336 | pending SIGSTOP. */ | |
3337 | registers_changed (); | |
28439f5e | 3338 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3339 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
3340 | if (debug_linux_nat) |
3341 | fprintf_unfiltered (gdb_stdlog, | |
3342 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
3343 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3344 | target_pid_to_str (lp->ptid)); | |
3345 | lp->stopped = 0; | |
3346 | gdb_assert (lp->resumed); | |
3347 | ||
ca2163eb PA |
3348 | /* Catch the pending SIGSTOP. */ |
3349 | status = lp->status; | |
3350 | lp->status = 0; | |
3351 | ||
d6b0e80f | 3352 | stop_wait_callback (lp, NULL); |
ca2163eb PA |
3353 | |
3354 | /* If the lp->status field isn't empty, we caught another signal | |
3355 | while flushing the SIGSTOP. Return it back to the event | |
3356 | queue of the LWP, as we already have an event to handle. */ | |
3357 | if (lp->status) | |
3358 | { | |
3359 | if (debug_linux_nat) | |
3360 | fprintf_unfiltered (gdb_stdlog, | |
3361 | "LLW: kill %s, %s\n", | |
3362 | target_pid_to_str (lp->ptid), | |
3363 | status_to_str (lp->status)); | |
3364 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
3365 | } | |
3366 | ||
3367 | lp->status = status; | |
d6b0e80f AC |
3368 | } |
3369 | ||
b84876c2 PA |
3370 | if (!target_can_async_p ()) |
3371 | { | |
3372 | /* Causes SIGINT to be passed on to the attached process. */ | |
3373 | set_sigint_trap (); | |
b84876c2 | 3374 | } |
d6b0e80f | 3375 | |
47608cb1 PA |
3376 | /* Translate generic target_wait options into waitpid options. */ |
3377 | if (target_options & TARGET_WNOHANG) | |
3378 | options |= WNOHANG; | |
7feb7d06 | 3379 | |
d90e17a7 | 3380 | while (lp == NULL) |
d6b0e80f AC |
3381 | { |
3382 | pid_t lwpid; | |
3383 | ||
7feb7d06 | 3384 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 3385 | |
d6b0e80f AC |
3386 | if (lwpid > 0) |
3387 | { | |
3388 | gdb_assert (pid == -1 || lwpid == pid); | |
3389 | ||
3390 | if (debug_linux_nat) | |
3391 | { | |
3392 | fprintf_unfiltered (gdb_stdlog, | |
3393 | "LLW: waitpid %ld received %s\n", | |
3394 | (long) lwpid, status_to_str (status)); | |
3395 | } | |
3396 | ||
02f3fc28 | 3397 | lp = linux_nat_filter_event (lwpid, status, options); |
d90e17a7 PA |
3398 | |
3399 | if (lp | |
3400 | && ptid_is_pid (ptid) | |
3401 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 3402 | { |
e3e9f5a2 PA |
3403 | gdb_assert (lp->resumed); |
3404 | ||
d90e17a7 PA |
3405 | if (debug_linux_nat) |
3406 | fprintf (stderr, "LWP %ld got an event %06x, leaving pending.\n", | |
3407 | ptid_get_lwp (lp->ptid), status); | |
3408 | ||
ca2163eb | 3409 | if (WIFSTOPPED (lp->status)) |
d90e17a7 | 3410 | { |
ca2163eb | 3411 | if (WSTOPSIG (lp->status) != SIGSTOP) |
d90e17a7 | 3412 | { |
e3e9f5a2 PA |
3413 | /* Cancel breakpoint hits. The breakpoint may |
3414 | be removed before we fetch events from this | |
3415 | process to report to the core. It is best | |
3416 | not to assume the moribund breakpoints | |
3417 | heuristic always handles these cases --- it | |
3418 | could be too many events go through to the | |
3419 | core before this one is handled. All-stop | |
3420 | always cancels breakpoint hits in all | |
3421 | threads. */ | |
3422 | if (non_stop | |
3423 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE | |
3424 | && WSTOPSIG (lp->status) == SIGTRAP | |
3425 | && cancel_breakpoint (lp)) | |
3426 | { | |
3427 | /* Throw away the SIGTRAP. */ | |
3428 | lp->status = 0; | |
3429 | ||
3430 | if (debug_linux_nat) | |
3431 | fprintf (stderr, | |
3432 | "LLW: LWP %ld hit a breakpoint while waiting " | |
3433 | "for another process; cancelled it\n", | |
3434 | ptid_get_lwp (lp->ptid)); | |
3435 | } | |
3436 | lp->stopped = 1; | |
d90e17a7 PA |
3437 | } |
3438 | else | |
3439 | { | |
3440 | lp->stopped = 1; | |
3441 | lp->signalled = 0; | |
3442 | } | |
3443 | } | |
3444 | else if (WIFEXITED (status) || WIFSIGNALED (status)) | |
3445 | { | |
3446 | if (debug_linux_nat) | |
3447 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
3448 | ptid_get_lwp (lp->ptid)); | |
3449 | ||
3450 | /* This was the last lwp in the process. Since | |
3451 | events are serialized to GDB core, and we can't | |
3452 | report this one right now, but GDB core and the | |
3453 | other target layers will want to be notified | |
3454 | about the exit code/signal, leave the status | |
3455 | pending for the next time we're able to report | |
3456 | it. */ | |
d90e17a7 PA |
3457 | |
3458 | /* Prevent trying to stop this thread again. We'll | |
3459 | never try to resume it because it has a pending | |
3460 | status. */ | |
3461 | lp->stopped = 1; | |
3462 | ||
3463 | /* Dead LWP's aren't expected to reported a pending | |
3464 | sigstop. */ | |
3465 | lp->signalled = 0; | |
3466 | ||
3467 | /* Store the pending event in the waitstatus as | |
3468 | well, because W_EXITCODE(0,0) == 0. */ | |
ca2163eb | 3469 | store_waitstatus (&lp->waitstatus, lp->status); |
d90e17a7 PA |
3470 | } |
3471 | ||
3472 | /* Keep looking. */ | |
3473 | lp = NULL; | |
d6b0e80f AC |
3474 | continue; |
3475 | } | |
3476 | ||
d90e17a7 PA |
3477 | if (lp) |
3478 | break; | |
3479 | else | |
3480 | { | |
3481 | if (pid == -1) | |
3482 | { | |
3483 | /* waitpid did return something. Restart over. */ | |
3484 | options |= __WCLONE; | |
3485 | } | |
3486 | continue; | |
3487 | } | |
d6b0e80f AC |
3488 | } |
3489 | ||
3490 | if (pid == -1) | |
3491 | { | |
3492 | /* Alternate between checking cloned and uncloned processes. */ | |
3493 | options ^= __WCLONE; | |
3494 | ||
b84876c2 PA |
3495 | /* And every time we have checked both: |
3496 | In async mode, return to event loop; | |
3497 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 3498 | if (options & __WCLONE) |
b84876c2 | 3499 | { |
47608cb1 | 3500 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
3501 | { |
3502 | /* No interesting event. */ | |
3503 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3504 | ||
b84876c2 PA |
3505 | if (debug_linux_nat_async) |
3506 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3507 | ||
7feb7d06 | 3508 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
3509 | return minus_one_ptid; |
3510 | } | |
3511 | ||
3512 | sigsuspend (&suspend_mask); | |
3513 | } | |
d6b0e80f | 3514 | } |
28736962 PA |
3515 | else if (target_options & TARGET_WNOHANG) |
3516 | { | |
3517 | /* No interesting event for PID yet. */ | |
3518 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3519 | ||
3520 | if (debug_linux_nat_async) | |
3521 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
3522 | ||
3523 | restore_child_signals_mask (&prev_mask); | |
3524 | return minus_one_ptid; | |
3525 | } | |
d6b0e80f AC |
3526 | |
3527 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3528 | gdb_assert (lp == NULL); |
d6b0e80f AC |
3529 | } |
3530 | ||
b84876c2 | 3531 | if (!target_can_async_p ()) |
d26b5354 | 3532 | clear_sigint_trap (); |
d6b0e80f AC |
3533 | |
3534 | gdb_assert (lp); | |
3535 | ||
ca2163eb PA |
3536 | status = lp->status; |
3537 | lp->status = 0; | |
3538 | ||
d6b0e80f AC |
3539 | /* Don't report signals that GDB isn't interested in, such as |
3540 | signals that are neither printed nor stopped upon. Stopping all | |
3541 | threads can be a bit time-consuming so if we want decent | |
3542 | performance with heavily multi-threaded programs, especially when | |
3543 | they're using a high frequency timer, we'd better avoid it if we | |
3544 | can. */ | |
3545 | ||
3546 | if (WIFSTOPPED (status)) | |
3547 | { | |
3548 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
d6b48e9c PA |
3549 | struct inferior *inf; |
3550 | ||
3551 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
3552 | gdb_assert (inf); | |
d6b0e80f | 3553 | |
d6b48e9c PA |
3554 | /* Defer to common code if we get a signal while |
3555 | single-stepping, since that may need special care, e.g. to | |
3556 | skip the signal handler, or, if we're gaining control of the | |
3557 | inferior. */ | |
d539ed7e | 3558 | if (!lp->step |
d6b48e9c | 3559 | && inf->stop_soon == NO_STOP_QUIETLY |
d539ed7e | 3560 | && signal_stop_state (signo) == 0 |
d6b0e80f AC |
3561 | && signal_print_state (signo) == 0 |
3562 | && signal_pass_state (signo) == 1) | |
3563 | { | |
3564 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3565 | here? It is not clear we should. GDB may not expect | |
3566 | other threads to run. On the other hand, not resuming | |
3567 | newly attached threads may cause an unwanted delay in | |
3568 | getting them running. */ | |
3569 | registers_changed (); | |
28439f5e | 3570 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3571 | lp->step, signo); |
d6b0e80f AC |
3572 | if (debug_linux_nat) |
3573 | fprintf_unfiltered (gdb_stdlog, | |
3574 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3575 | lp->step ? | |
3576 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3577 | target_pid_to_str (lp->ptid), | |
3578 | signo ? strsignal (signo) : "0"); | |
3579 | lp->stopped = 0; | |
d6b0e80f AC |
3580 | goto retry; |
3581 | } | |
3582 | ||
1ad15515 | 3583 | if (!non_stop) |
d6b0e80f | 3584 | { |
1ad15515 PA |
3585 | /* Only do the below in all-stop, as we currently use SIGINT |
3586 | to implement target_stop (see linux_nat_stop) in | |
3587 | non-stop. */ | |
3588 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3589 | { | |
3590 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3591 | forwarded to the entire process group, that is, all LWPs | |
3592 | will receive it - unless they're using CLONE_THREAD to | |
3593 | share signals. Since we only want to report it once, we | |
3594 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3595 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3596 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3597 | lp->ignore_sigint = 0; |
3598 | } | |
3599 | else | |
3600 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3601 | } |
3602 | } | |
3603 | ||
3604 | /* This LWP is stopped now. */ | |
3605 | lp->stopped = 1; | |
3606 | ||
3607 | if (debug_linux_nat) | |
3608 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3609 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3610 | ||
4c28f408 PA |
3611 | if (!non_stop) |
3612 | { | |
3613 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3614 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3615 | |
3616 | /* ... and wait until all of them have reported back that | |
3617 | they're no longer running. */ | |
d90e17a7 | 3618 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3619 | |
3620 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3621 | from among those that have had events. Giving equal priority | |
3622 | to all LWPs that have had events helps prevent | |
3623 | starvation. */ | |
3624 | if (pid == -1) | |
d90e17a7 | 3625 | select_event_lwp (ptid, &lp, &status); |
d6b0e80f | 3626 | |
e3e9f5a2 PA |
3627 | /* Now that we've selected our final event LWP, cancel any |
3628 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
3629 | See the comment in cancel_breakpoints_callback to find out | |
3630 | why. */ | |
3631 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); | |
3632 | ||
3633 | /* In all-stop, from the core's perspective, all LWPs are now | |
3634 | stopped until a new resume action is sent over. */ | |
3635 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
3636 | } | |
3637 | else | |
3638 | lp->resumed = 0; | |
d6b0e80f | 3639 | |
d6b0e80f AC |
3640 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) |
3641 | { | |
d6b0e80f AC |
3642 | if (debug_linux_nat) |
3643 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3644 | "LLW: trap ptid is %s.\n", |
3645 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3646 | } |
d6b0e80f AC |
3647 | |
3648 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3649 | { | |
3650 | *ourstatus = lp->waitstatus; | |
3651 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3652 | } | |
3653 | else | |
3654 | store_waitstatus (ourstatus, status); | |
3655 | ||
b84876c2 PA |
3656 | if (debug_linux_nat_async) |
3657 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); | |
3658 | ||
7feb7d06 | 3659 | restore_child_signals_mask (&prev_mask); |
dc146f7c | 3660 | lp->core = linux_nat_core_of_thread_1 (lp->ptid); |
f973ed9c | 3661 | return lp->ptid; |
d6b0e80f AC |
3662 | } |
3663 | ||
e3e9f5a2 PA |
3664 | /* Resume LWPs that are currently stopped without any pending status |
3665 | to report, but are resumed from the core's perspective. */ | |
3666 | ||
3667 | static int | |
3668 | resume_stopped_resumed_lwps (struct lwp_info *lp, void *data) | |
3669 | { | |
3670 | ptid_t *wait_ptid_p = data; | |
3671 | ||
3672 | if (lp->stopped | |
3673 | && lp->resumed | |
3674 | && lp->status == 0 | |
3675 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
3676 | { | |
3677 | gdb_assert (is_executing (lp->ptid)); | |
3678 | ||
3679 | /* Don't bother if there's a breakpoint at PC that we'd hit | |
3680 | immediately, and we're not waiting for this LWP. */ | |
3681 | if (!ptid_match (lp->ptid, *wait_ptid_p)) | |
3682 | { | |
3683 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
3684 | CORE_ADDR pc = regcache_read_pc (regcache); | |
3685 | ||
3686 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3687 | return 0; | |
3688 | } | |
3689 | ||
3690 | if (debug_linux_nat) | |
3691 | fprintf_unfiltered (gdb_stdlog, | |
3692 | "RSRL: resuming stopped-resumed LWP %s\n", | |
3693 | target_pid_to_str (lp->ptid)); | |
3694 | ||
3695 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
3696 | lp->step, TARGET_SIGNAL_0); | |
3697 | lp->stopped = 0; | |
3698 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
3699 | lp->stopped_by_watchpoint = 0; | |
3700 | } | |
3701 | ||
3702 | return 0; | |
3703 | } | |
3704 | ||
7feb7d06 PA |
3705 | static ptid_t |
3706 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3707 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3708 | int target_options) | |
7feb7d06 PA |
3709 | { |
3710 | ptid_t event_ptid; | |
3711 | ||
3712 | if (debug_linux_nat) | |
3713 | fprintf_unfiltered (gdb_stdlog, "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
3714 | ||
3715 | /* Flush the async file first. */ | |
3716 | if (target_can_async_p ()) | |
3717 | async_file_flush (); | |
3718 | ||
e3e9f5a2 PA |
3719 | /* Resume LWPs that are currently stopped without any pending status |
3720 | to report, but are resumed from the core's perspective. LWPs get | |
3721 | in this state if we find them stopping at a time we're not | |
3722 | interested in reporting the event (target_wait on a | |
3723 | specific_process, for example, see linux_nat_wait_1), and | |
3724 | meanwhile the event became uninteresting. Don't bother resuming | |
3725 | LWPs we're not going to wait for if they'd stop immediately. */ | |
3726 | if (non_stop) | |
3727 | iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid); | |
3728 | ||
47608cb1 | 3729 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3730 | |
3731 | /* If we requested any event, and something came out, assume there | |
3732 | may be more. If we requested a specific lwp or process, also | |
3733 | assume there may be more. */ | |
3734 | if (target_can_async_p () | |
3735 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3736 | || !ptid_equal (ptid, minus_one_ptid))) | |
3737 | async_file_mark (); | |
3738 | ||
3739 | /* Get ready for the next event. */ | |
3740 | if (target_can_async_p ()) | |
3741 | target_async (inferior_event_handler, 0); | |
3742 | ||
3743 | return event_ptid; | |
3744 | } | |
3745 | ||
d6b0e80f AC |
3746 | static int |
3747 | kill_callback (struct lwp_info *lp, void *data) | |
3748 | { | |
3749 | errno = 0; | |
3750 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3751 | if (debug_linux_nat) | |
3752 | fprintf_unfiltered (gdb_stdlog, | |
3753 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3754 | target_pid_to_str (lp->ptid), | |
3755 | errno ? safe_strerror (errno) : "OK"); | |
3756 | ||
3757 | return 0; | |
3758 | } | |
3759 | ||
3760 | static int | |
3761 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3762 | { | |
3763 | pid_t pid; | |
3764 | ||
3765 | /* We must make sure that there are no pending events (delayed | |
3766 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3767 | program doesn't interfere with any following debugging session. */ | |
3768 | ||
3769 | /* For cloned processes we must check both with __WCLONE and | |
3770 | without, since the exit status of a cloned process isn't reported | |
3771 | with __WCLONE. */ | |
3772 | if (lp->cloned) | |
3773 | { | |
3774 | do | |
3775 | { | |
58aecb61 | 3776 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3777 | if (pid != (pid_t) -1) |
d6b0e80f | 3778 | { |
e85a822c DJ |
3779 | if (debug_linux_nat) |
3780 | fprintf_unfiltered (gdb_stdlog, | |
3781 | "KWC: wait %s received unknown.\n", | |
3782 | target_pid_to_str (lp->ptid)); | |
3783 | /* The Linux kernel sometimes fails to kill a thread | |
3784 | completely after PTRACE_KILL; that goes from the stop | |
3785 | point in do_fork out to the one in | |
3786 | get_signal_to_deliever and waits again. So kill it | |
3787 | again. */ | |
3788 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3789 | } |
3790 | } | |
3791 | while (pid == GET_LWP (lp->ptid)); | |
3792 | ||
3793 | gdb_assert (pid == -1 && errno == ECHILD); | |
3794 | } | |
3795 | ||
3796 | do | |
3797 | { | |
58aecb61 | 3798 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3799 | if (pid != (pid_t) -1) |
d6b0e80f | 3800 | { |
e85a822c DJ |
3801 | if (debug_linux_nat) |
3802 | fprintf_unfiltered (gdb_stdlog, | |
3803 | "KWC: wait %s received unk.\n", | |
3804 | target_pid_to_str (lp->ptid)); | |
3805 | /* See the call to kill_callback above. */ | |
3806 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3807 | } |
3808 | } | |
3809 | while (pid == GET_LWP (lp->ptid)); | |
3810 | ||
3811 | gdb_assert (pid == -1 && errno == ECHILD); | |
3812 | return 0; | |
3813 | } | |
3814 | ||
3815 | static void | |
7d85a9c0 | 3816 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3817 | { |
f973ed9c DJ |
3818 | struct target_waitstatus last; |
3819 | ptid_t last_ptid; | |
3820 | int status; | |
d6b0e80f | 3821 | |
f973ed9c DJ |
3822 | /* If we're stopped while forking and we haven't followed yet, |
3823 | kill the other task. We need to do this first because the | |
3824 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3825 | |
f973ed9c | 3826 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3827 | |
f973ed9c DJ |
3828 | if (last.kind == TARGET_WAITKIND_FORKED |
3829 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3830 | { | |
3a3e9ee3 | 3831 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3832 | wait (&status); |
3833 | } | |
3834 | ||
3835 | if (forks_exist_p ()) | |
7feb7d06 | 3836 | linux_fork_killall (); |
f973ed9c DJ |
3837 | else |
3838 | { | |
d90e17a7 | 3839 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
4c28f408 PA |
3840 | /* Stop all threads before killing them, since ptrace requires |
3841 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3842 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3843 | /* ... and wait until all of them have reported back that |
3844 | they're no longer running. */ | |
d90e17a7 | 3845 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3846 | |
f973ed9c | 3847 | /* Kill all LWP's ... */ |
d90e17a7 | 3848 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
3849 | |
3850 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 3851 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
3852 | } |
3853 | ||
3854 | target_mourn_inferior (); | |
d6b0e80f AC |
3855 | } |
3856 | ||
3857 | static void | |
136d6dae | 3858 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3859 | { |
d90e17a7 | 3860 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 3861 | |
f973ed9c | 3862 | if (! forks_exist_p ()) |
d90e17a7 PA |
3863 | /* Normal case, no other forks available. */ |
3864 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
3865 | else |
3866 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3867 | there are other viable forks to debug. Delete the exiting | |
3868 | one and context-switch to the first available. */ | |
3869 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3870 | } |
3871 | ||
5b009018 PA |
3872 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3873 | layout of the inferiors' architecture. */ | |
3874 | ||
3875 | static void | |
3876 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
3877 | { | |
3878 | int done = 0; | |
3879 | ||
3880 | if (linux_nat_siginfo_fixup != NULL) | |
3881 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3882 | ||
3883 | /* If there was no callback, or the callback didn't do anything, | |
3884 | then just do a straight memcpy. */ | |
3885 | if (!done) | |
3886 | { | |
3887 | if (direction == 1) | |
3888 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3889 | else | |
3890 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3891 | } | |
3892 | } | |
3893 | ||
4aa995e1 PA |
3894 | static LONGEST |
3895 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
3896 | const char *annex, gdb_byte *readbuf, | |
3897 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3898 | { | |
4aa995e1 PA |
3899 | int pid; |
3900 | struct siginfo siginfo; | |
5b009018 | 3901 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3902 | |
3903 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3904 | gdb_assert (readbuf || writebuf); | |
3905 | ||
3906 | pid = GET_LWP (inferior_ptid); | |
3907 | if (pid == 0) | |
3908 | pid = GET_PID (inferior_ptid); | |
3909 | ||
3910 | if (offset > sizeof (siginfo)) | |
3911 | return -1; | |
3912 | ||
3913 | errno = 0; | |
3914 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3915 | if (errno != 0) | |
3916 | return -1; | |
3917 | ||
5b009018 PA |
3918 | /* When GDB is built as a 64-bit application, ptrace writes into |
3919 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3920 | inferior with a 64-bit GDB should look the same as debugging it | |
3921 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3922 | the converted layout, so any read/write will have to be done | |
3923 | post-conversion. */ | |
3924 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3925 | ||
4aa995e1 PA |
3926 | if (offset + len > sizeof (siginfo)) |
3927 | len = sizeof (siginfo) - offset; | |
3928 | ||
3929 | if (readbuf != NULL) | |
5b009018 | 3930 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3931 | else |
3932 | { | |
5b009018 PA |
3933 | memcpy (inf_siginfo + offset, writebuf, len); |
3934 | ||
3935 | /* Convert back to ptrace layout before flushing it out. */ | |
3936 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3937 | ||
4aa995e1 PA |
3938 | errno = 0; |
3939 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3940 | if (errno != 0) | |
3941 | return -1; | |
3942 | } | |
3943 | ||
3944 | return len; | |
3945 | } | |
3946 | ||
10d6c8cd DJ |
3947 | static LONGEST |
3948 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
3949 | const char *annex, gdb_byte *readbuf, | |
3950 | const gdb_byte *writebuf, | |
3951 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 3952 | { |
4aa995e1 | 3953 | struct cleanup *old_chain; |
10d6c8cd | 3954 | LONGEST xfer; |
d6b0e80f | 3955 | |
4aa995e1 PA |
3956 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3957 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
3958 | offset, len); | |
3959 | ||
c35b1492 PA |
3960 | /* The target is connected but no live inferior is selected. Pass |
3961 | this request down to a lower stratum (e.g., the executable | |
3962 | file). */ | |
3963 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
3964 | return 0; | |
3965 | ||
4aa995e1 PA |
3966 | old_chain = save_inferior_ptid (); |
3967 | ||
d6b0e80f AC |
3968 | if (is_lwp (inferior_ptid)) |
3969 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
3970 | ||
10d6c8cd DJ |
3971 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
3972 | offset, len); | |
d6b0e80f AC |
3973 | |
3974 | do_cleanups (old_chain); | |
3975 | return xfer; | |
3976 | } | |
3977 | ||
3978 | static int | |
28439f5e | 3979 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 3980 | { |
4c28f408 PA |
3981 | int err; |
3982 | ||
d6b0e80f AC |
3983 | gdb_assert (is_lwp (ptid)); |
3984 | ||
4c28f408 PA |
3985 | /* Send signal 0 instead of anything ptrace, because ptracing a |
3986 | running thread errors out claiming that the thread doesn't | |
3987 | exist. */ | |
3988 | err = kill_lwp (GET_LWP (ptid), 0); | |
3989 | ||
d6b0e80f AC |
3990 | if (debug_linux_nat) |
3991 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 3992 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 3993 | target_pid_to_str (ptid), |
4c28f408 | 3994 | err ? safe_strerror (err) : "OK"); |
9c0dd46b | 3995 | |
4c28f408 | 3996 | if (err != 0) |
d6b0e80f AC |
3997 | return 0; |
3998 | ||
3999 | return 1; | |
4000 | } | |
4001 | ||
28439f5e PA |
4002 | static int |
4003 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
4004 | { | |
4005 | return linux_thread_alive (ptid); | |
4006 | } | |
4007 | ||
d6b0e80f | 4008 | static char * |
117de6a9 | 4009 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
4010 | { |
4011 | static char buf[64]; | |
4012 | ||
a0ef4274 | 4013 | if (is_lwp (ptid) |
d90e17a7 PA |
4014 | && (GET_PID (ptid) != GET_LWP (ptid) |
4015 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
4016 | { |
4017 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
4018 | return buf; | |
4019 | } | |
4020 | ||
4021 | return normal_pid_to_str (ptid); | |
4022 | } | |
4023 | ||
dba24537 AC |
4024 | /* Accepts an integer PID; Returns a string representing a file that |
4025 | can be opened to get the symbols for the child process. */ | |
4026 | ||
6d8fd2b7 UW |
4027 | static char * |
4028 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
4029 | { |
4030 | char *name1, *name2; | |
4031 | ||
4032 | name1 = xmalloc (MAXPATHLEN); | |
4033 | name2 = xmalloc (MAXPATHLEN); | |
4034 | make_cleanup (xfree, name1); | |
4035 | make_cleanup (xfree, name2); | |
4036 | memset (name2, 0, MAXPATHLEN); | |
4037 | ||
4038 | sprintf (name1, "/proc/%d/exe", pid); | |
4039 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
4040 | return name2; | |
4041 | else | |
4042 | return name1; | |
4043 | } | |
4044 | ||
4045 | /* Service function for corefiles and info proc. */ | |
4046 | ||
4047 | static int | |
4048 | read_mapping (FILE *mapfile, | |
4049 | long long *addr, | |
4050 | long long *endaddr, | |
4051 | char *permissions, | |
4052 | long long *offset, | |
4053 | char *device, long long *inode, char *filename) | |
4054 | { | |
4055 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
4056 | addr, endaddr, permissions, offset, device, inode); | |
4057 | ||
2e14c2ea MS |
4058 | filename[0] = '\0'; |
4059 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
4060 | { |
4061 | /* Eat everything up to EOL for the filename. This will prevent | |
4062 | weird filenames (such as one with embedded whitespace) from | |
4063 | confusing this code. It also makes this code more robust in | |
4064 | respect to annotations the kernel may add after the filename. | |
4065 | ||
4066 | Note the filename is used for informational purposes | |
4067 | only. */ | |
4068 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
4069 | } | |
2e14c2ea | 4070 | |
dba24537 AC |
4071 | return (ret != 0 && ret != EOF); |
4072 | } | |
4073 | ||
4074 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
4075 | regions in the inferior for a corefile. */ | |
4076 | ||
4077 | static int | |
4078 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
4079 | unsigned long, | |
4080 | int, int, int, void *), void *obfd) | |
4081 | { | |
89ecc4f5 | 4082 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
4083 | char mapsfilename[MAXPATHLEN]; |
4084 | FILE *mapsfile; | |
4085 | long long addr, endaddr, size, offset, inode; | |
4086 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
4087 | int read, write, exec; | |
4088 | int ret; | |
7c8a8b04 | 4089 | struct cleanup *cleanup; |
dba24537 AC |
4090 | |
4091 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 4092 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 4093 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 4094 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 4095 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
4096 | |
4097 | if (info_verbose) | |
4098 | fprintf_filtered (gdb_stdout, | |
4099 | "Reading memory regions from %s\n", mapsfilename); | |
4100 | ||
4101 | /* Now iterate until end-of-file. */ | |
4102 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
4103 | &offset, &device[0], &inode, &filename[0])) | |
4104 | { | |
4105 | size = endaddr - addr; | |
4106 | ||
4107 | /* Get the segment's permissions. */ | |
4108 | read = (strchr (permissions, 'r') != 0); | |
4109 | write = (strchr (permissions, 'w') != 0); | |
4110 | exec = (strchr (permissions, 'x') != 0); | |
4111 | ||
4112 | if (info_verbose) | |
4113 | { | |
4114 | fprintf_filtered (gdb_stdout, | |
5af949e3 UW |
4115 | "Save segment, %lld bytes at %s (%c%c%c)", |
4116 | size, paddress (target_gdbarch, addr), | |
dba24537 AC |
4117 | read ? 'r' : ' ', |
4118 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 4119 | if (filename[0]) |
dba24537 AC |
4120 | fprintf_filtered (gdb_stdout, " for %s", filename); |
4121 | fprintf_filtered (gdb_stdout, "\n"); | |
4122 | } | |
4123 | ||
4124 | /* Invoke the callback function to create the corefile | |
4125 | segment. */ | |
4126 | func (addr, size, read, write, exec, obfd); | |
4127 | } | |
7c8a8b04 | 4128 | do_cleanups (cleanup); |
dba24537 AC |
4129 | return 0; |
4130 | } | |
4131 | ||
2020b7ab PA |
4132 | static int |
4133 | find_signalled_thread (struct thread_info *info, void *data) | |
4134 | { | |
4135 | if (info->stop_signal != TARGET_SIGNAL_0 | |
4136 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) | |
4137 | return 1; | |
4138 | ||
4139 | return 0; | |
4140 | } | |
4141 | ||
4142 | static enum target_signal | |
4143 | find_stop_signal (void) | |
4144 | { | |
4145 | struct thread_info *info = | |
4146 | iterate_over_threads (find_signalled_thread, NULL); | |
4147 | ||
4148 | if (info) | |
4149 | return info->stop_signal; | |
4150 | else | |
4151 | return TARGET_SIGNAL_0; | |
4152 | } | |
4153 | ||
dba24537 AC |
4154 | /* Records the thread's register state for the corefile note |
4155 | section. */ | |
4156 | ||
4157 | static char * | |
4158 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
4159 | char *note_data, int *note_size, |
4160 | enum target_signal stop_signal) | |
dba24537 AC |
4161 | { |
4162 | gdb_gregset_t gregs; | |
4163 | gdb_fpregset_t fpregs; | |
dba24537 | 4164 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
4165 | struct gdbarch *gdbarch = target_gdbarch; |
4166 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 4167 | const struct regset *regset; |
55e969c1 | 4168 | int core_regset_p; |
594f7785 | 4169 | struct cleanup *old_chain; |
17ea7499 CES |
4170 | struct core_regset_section *sect_list; |
4171 | char *gdb_regset; | |
594f7785 UW |
4172 | |
4173 | old_chain = save_inferior_ptid (); | |
4174 | inferior_ptid = ptid; | |
4175 | target_fetch_registers (regcache, -1); | |
4176 | do_cleanups (old_chain); | |
4f844a66 DM |
4177 | |
4178 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
4179 | sect_list = gdbarch_core_regset_sections (gdbarch); |
4180 | ||
55e969c1 DM |
4181 | if (core_regset_p |
4182 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
4183 | sizeof (gregs))) != NULL | |
4184 | && regset->collect_regset != NULL) | |
594f7785 | 4185 | regset->collect_regset (regset, regcache, -1, |
55e969c1 | 4186 | &gregs, sizeof (gregs)); |
4f844a66 | 4187 | else |
594f7785 | 4188 | fill_gregset (regcache, &gregs, -1); |
4f844a66 | 4189 | |
55e969c1 DM |
4190 | note_data = (char *) elfcore_write_prstatus (obfd, |
4191 | note_data, | |
4192 | note_size, | |
4193 | lwp, | |
4194 | stop_signal, &gregs); | |
4195 | ||
17ea7499 CES |
4196 | /* The loop below uses the new struct core_regset_section, which stores |
4197 | the supported section names and sizes for the core file. Note that | |
4198 | note PRSTATUS needs to be treated specially. But the other notes are | |
4199 | structurally the same, so they can benefit from the new struct. */ | |
4200 | if (core_regset_p && sect_list != NULL) | |
4201 | while (sect_list->sect_name != NULL) | |
4202 | { | |
4203 | /* .reg was already handled above. */ | |
4204 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
4205 | { | |
4206 | sect_list++; | |
4207 | continue; | |
4208 | } | |
4209 | regset = gdbarch_regset_from_core_section (gdbarch, | |
4210 | sect_list->sect_name, | |
4211 | sect_list->size); | |
4212 | gdb_assert (regset && regset->collect_regset); | |
4213 | gdb_regset = xmalloc (sect_list->size); | |
4214 | regset->collect_regset (regset, regcache, -1, | |
4215 | gdb_regset, sect_list->size); | |
4216 | note_data = (char *) elfcore_write_register_note (obfd, | |
4217 | note_data, | |
4218 | note_size, | |
4219 | sect_list->sect_name, | |
4220 | gdb_regset, | |
4221 | sect_list->size); | |
4222 | xfree (gdb_regset); | |
4223 | sect_list++; | |
4224 | } | |
dba24537 | 4225 | |
17ea7499 CES |
4226 | /* For architectures that does not have the struct core_regset_section |
4227 | implemented, we use the old method. When all the architectures have | |
4228 | the new support, the code below should be deleted. */ | |
4f844a66 | 4229 | else |
17ea7499 CES |
4230 | { |
4231 | if (core_regset_p | |
4232 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
4233 | sizeof (fpregs))) != NULL | |
4234 | && regset->collect_regset != NULL) | |
4235 | regset->collect_regset (regset, regcache, -1, | |
4236 | &fpregs, sizeof (fpregs)); | |
4237 | else | |
4238 | fill_fpregset (regcache, &fpregs, -1); | |
4239 | ||
4240 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
4241 | note_data, | |
4242 | note_size, | |
4243 | &fpregs, sizeof (fpregs)); | |
4244 | } | |
4f844a66 | 4245 | |
dba24537 AC |
4246 | return note_data; |
4247 | } | |
4248 | ||
4249 | struct linux_nat_corefile_thread_data | |
4250 | { | |
4251 | bfd *obfd; | |
4252 | char *note_data; | |
4253 | int *note_size; | |
4254 | int num_notes; | |
2020b7ab | 4255 | enum target_signal stop_signal; |
dba24537 AC |
4256 | }; |
4257 | ||
4258 | /* Called by gdbthread.c once per thread. Records the thread's | |
4259 | register state for the corefile note section. */ | |
4260 | ||
4261 | static int | |
4262 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
4263 | { | |
4264 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 4265 | |
dba24537 AC |
4266 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
4267 | ti->ptid, | |
4268 | args->note_data, | |
2020b7ab PA |
4269 | args->note_size, |
4270 | args->stop_signal); | |
dba24537 | 4271 | args->num_notes++; |
56be3814 | 4272 | |
dba24537 AC |
4273 | return 0; |
4274 | } | |
4275 | ||
efcbbd14 UW |
4276 | /* Enumerate spufs IDs for process PID. */ |
4277 | ||
4278 | static void | |
4279 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
4280 | { | |
4281 | char path[128]; | |
4282 | DIR *dir; | |
4283 | struct dirent *entry; | |
4284 | ||
4285 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4286 | dir = opendir (path); | |
4287 | if (!dir) | |
4288 | return; | |
4289 | ||
4290 | rewinddir (dir); | |
4291 | while ((entry = readdir (dir)) != NULL) | |
4292 | { | |
4293 | struct stat st; | |
4294 | struct statfs stfs; | |
4295 | int fd; | |
4296 | ||
4297 | fd = atoi (entry->d_name); | |
4298 | if (!fd) | |
4299 | continue; | |
4300 | ||
4301 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4302 | if (stat (path, &st) != 0) | |
4303 | continue; | |
4304 | if (!S_ISDIR (st.st_mode)) | |
4305 | continue; | |
4306 | ||
4307 | if (statfs (path, &stfs) != 0) | |
4308 | continue; | |
4309 | if (stfs.f_type != SPUFS_MAGIC) | |
4310 | continue; | |
4311 | ||
4312 | callback (data, fd); | |
4313 | } | |
4314 | ||
4315 | closedir (dir); | |
4316 | } | |
4317 | ||
4318 | /* Generate corefile notes for SPU contexts. */ | |
4319 | ||
4320 | struct linux_spu_corefile_data | |
4321 | { | |
4322 | bfd *obfd; | |
4323 | char *note_data; | |
4324 | int *note_size; | |
4325 | }; | |
4326 | ||
4327 | static void | |
4328 | linux_spu_corefile_callback (void *data, int fd) | |
4329 | { | |
4330 | struct linux_spu_corefile_data *args = data; | |
4331 | int i; | |
4332 | ||
4333 | static const char *spu_files[] = | |
4334 | { | |
4335 | "object-id", | |
4336 | "mem", | |
4337 | "regs", | |
4338 | "fpcr", | |
4339 | "lslr", | |
4340 | "decr", | |
4341 | "decr_status", | |
4342 | "signal1", | |
4343 | "signal1_type", | |
4344 | "signal2", | |
4345 | "signal2_type", | |
4346 | "event_mask", | |
4347 | "event_status", | |
4348 | "mbox_info", | |
4349 | "ibox_info", | |
4350 | "wbox_info", | |
4351 | "dma_info", | |
4352 | "proxydma_info", | |
4353 | }; | |
4354 | ||
4355 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
4356 | { | |
4357 | char annex[32], note_name[32]; | |
4358 | gdb_byte *spu_data; | |
4359 | LONGEST spu_len; | |
4360 | ||
4361 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
4362 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
4363 | annex, &spu_data); | |
4364 | if (spu_len > 0) | |
4365 | { | |
4366 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
4367 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
4368 | args->note_size, note_name, | |
4369 | NT_SPU, spu_data, spu_len); | |
4370 | xfree (spu_data); | |
4371 | } | |
4372 | } | |
4373 | } | |
4374 | ||
4375 | static char * | |
4376 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
4377 | { | |
4378 | struct linux_spu_corefile_data args; | |
4379 | args.obfd = obfd; | |
4380 | args.note_data = note_data; | |
4381 | args.note_size = note_size; | |
4382 | ||
4383 | iterate_over_spus (PIDGET (inferior_ptid), | |
4384 | linux_spu_corefile_callback, &args); | |
4385 | ||
4386 | return args.note_data; | |
4387 | } | |
4388 | ||
dba24537 AC |
4389 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
4390 | section for a corefile, and returns it in a malloc buffer. */ | |
4391 | ||
4392 | static char * | |
4393 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
4394 | { | |
4395 | struct linux_nat_corefile_thread_data thread_args; | |
4396 | struct cleanup *old_chain; | |
d99148ef | 4397 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 4398 | char fname[16] = { '\0' }; |
d99148ef | 4399 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
4400 | char psargs[80] = { '\0' }; |
4401 | char *note_data = NULL; | |
4402 | ptid_t current_ptid = inferior_ptid; | |
d90e17a7 | 4403 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 4404 | gdb_byte *auxv; |
dba24537 AC |
4405 | int auxv_len; |
4406 | ||
4407 | if (get_exec_file (0)) | |
4408 | { | |
4409 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
4410 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
4411 | if (get_inferior_args ()) | |
4412 | { | |
d99148ef JK |
4413 | char *string_end; |
4414 | char *psargs_end = psargs + sizeof (psargs); | |
4415 | ||
4416 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
4417 | strings fine. */ | |
4418 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
4419 | if (string_end != NULL) | |
4420 | { | |
4421 | *string_end++ = ' '; | |
4422 | strncpy (string_end, get_inferior_args (), | |
4423 | psargs_end - string_end); | |
4424 | } | |
dba24537 AC |
4425 | } |
4426 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
4427 | note_data, | |
4428 | note_size, fname, psargs); | |
4429 | } | |
4430 | ||
4431 | /* Dump information for threads. */ | |
4432 | thread_args.obfd = obfd; | |
4433 | thread_args.note_data = note_data; | |
4434 | thread_args.note_size = note_size; | |
4435 | thread_args.num_notes = 0; | |
2020b7ab | 4436 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 4437 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
4438 | gdb_assert (thread_args.num_notes != 0); |
4439 | note_data = thread_args.note_data; | |
dba24537 | 4440 | |
13547ab6 DJ |
4441 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
4442 | NULL, &auxv); | |
dba24537 AC |
4443 | if (auxv_len > 0) |
4444 | { | |
4445 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
4446 | "CORE", NT_AUXV, auxv, auxv_len); | |
4447 | xfree (auxv); | |
4448 | } | |
4449 | ||
efcbbd14 UW |
4450 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
4451 | ||
dba24537 AC |
4452 | make_cleanup (xfree, note_data); |
4453 | return note_data; | |
4454 | } | |
4455 | ||
4456 | /* Implement the "info proc" command. */ | |
4457 | ||
4458 | static void | |
4459 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
4460 | { | |
89ecc4f5 DE |
4461 | /* A long is used for pid instead of an int to avoid a loss of precision |
4462 | compiler warning from the output of strtoul. */ | |
4463 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
4464 | FILE *procfile; |
4465 | char **argv = NULL; | |
4466 | char buffer[MAXPATHLEN]; | |
4467 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
4468 | int cmdline_f = 1; | |
4469 | int cwd_f = 1; | |
4470 | int exe_f = 1; | |
4471 | int mappings_f = 0; | |
4472 | int environ_f = 0; | |
4473 | int status_f = 0; | |
4474 | int stat_f = 0; | |
4475 | int all = 0; | |
4476 | struct stat dummy; | |
4477 | ||
4478 | if (args) | |
4479 | { | |
4480 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
4481 | argv = gdb_buildargv (args); |
4482 | make_cleanup_freeargv (argv); | |
dba24537 AC |
4483 | } |
4484 | while (argv != NULL && *argv != NULL) | |
4485 | { | |
4486 | if (isdigit (argv[0][0])) | |
4487 | { | |
4488 | pid = strtoul (argv[0], NULL, 10); | |
4489 | } | |
4490 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
4491 | { | |
4492 | mappings_f = 1; | |
4493 | } | |
4494 | else if (strcmp (argv[0], "status") == 0) | |
4495 | { | |
4496 | status_f = 1; | |
4497 | } | |
4498 | else if (strcmp (argv[0], "stat") == 0) | |
4499 | { | |
4500 | stat_f = 1; | |
4501 | } | |
4502 | else if (strcmp (argv[0], "cmd") == 0) | |
4503 | { | |
4504 | cmdline_f = 1; | |
4505 | } | |
4506 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
4507 | { | |
4508 | exe_f = 1; | |
4509 | } | |
4510 | else if (strcmp (argv[0], "cwd") == 0) | |
4511 | { | |
4512 | cwd_f = 1; | |
4513 | } | |
4514 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
4515 | { | |
4516 | all = 1; | |
4517 | } | |
4518 | else | |
4519 | { | |
4520 | /* [...] (future options here) */ | |
4521 | } | |
4522 | argv++; | |
4523 | } | |
4524 | if (pid == 0) | |
8a3fe4f8 | 4525 | error (_("No current process: you must name one.")); |
dba24537 | 4526 | |
89ecc4f5 | 4527 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4528 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4529 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4530 | |
89ecc4f5 | 4531 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
4532 | if (cmdline_f || all) |
4533 | { | |
89ecc4f5 | 4534 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4535 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4536 | { |
7c8a8b04 | 4537 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
bf1d7d9c JB |
4538 | if (fgets (buffer, sizeof (buffer), procfile)) |
4539 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4540 | else | |
4541 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4542 | do_cleanups (cleanup); |
dba24537 AC |
4543 | } |
4544 | else | |
8a3fe4f8 | 4545 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4546 | } |
4547 | if (cwd_f || all) | |
4548 | { | |
89ecc4f5 | 4549 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4550 | memset (fname2, 0, sizeof (fname2)); |
4551 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4552 | printf_filtered ("cwd = '%s'\n", fname2); | |
4553 | else | |
8a3fe4f8 | 4554 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4555 | } |
4556 | if (exe_f || all) | |
4557 | { | |
89ecc4f5 | 4558 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4559 | memset (fname2, 0, sizeof (fname2)); |
4560 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4561 | printf_filtered ("exe = '%s'\n", fname2); | |
4562 | else | |
8a3fe4f8 | 4563 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4564 | } |
4565 | if (mappings_f || all) | |
4566 | { | |
89ecc4f5 | 4567 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4568 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4569 | { |
4570 | long long addr, endaddr, size, offset, inode; | |
4571 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4572 | struct cleanup *cleanup; |
dba24537 | 4573 | |
7c8a8b04 | 4574 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4575 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4576 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4577 | { |
4578 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4579 | "Start Addr", | |
4580 | " End Addr", | |
4581 | " Size", " Offset", "objfile"); | |
4582 | } | |
4583 | else | |
4584 | { | |
4585 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4586 | "Start Addr", | |
4587 | " End Addr", | |
4588 | " Size", " Offset", "objfile"); | |
4589 | } | |
4590 | ||
4591 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4592 | &offset, &device[0], &inode, &filename[0])) | |
4593 | { | |
4594 | size = endaddr - addr; | |
4595 | ||
4596 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4597 | calls here (and possibly above) should be abstracted | |
4598 | out into their own functions? Andrew suggests using | |
4599 | a generic local_address_string instead to print out | |
4600 | the addresses; that makes sense to me, too. */ | |
4601 | ||
a97b0ac8 | 4602 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4603 | { |
4604 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4605 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4606 | (unsigned long) endaddr, | |
4607 | (int) size, | |
4608 | (unsigned int) offset, | |
4609 | filename[0] ? filename : ""); | |
4610 | } | |
4611 | else | |
4612 | { | |
4613 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4614 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4615 | (unsigned long) endaddr, | |
4616 | (int) size, | |
4617 | (unsigned int) offset, | |
4618 | filename[0] ? filename : ""); | |
4619 | } | |
4620 | } | |
4621 | ||
7c8a8b04 | 4622 | do_cleanups (cleanup); |
dba24537 AC |
4623 | } |
4624 | else | |
8a3fe4f8 | 4625 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4626 | } |
4627 | if (status_f || all) | |
4628 | { | |
89ecc4f5 | 4629 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4630 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4631 | { |
7c8a8b04 | 4632 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4633 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4634 | puts_filtered (buffer); | |
7c8a8b04 | 4635 | do_cleanups (cleanup); |
dba24537 AC |
4636 | } |
4637 | else | |
8a3fe4f8 | 4638 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4639 | } |
4640 | if (stat_f || all) | |
4641 | { | |
89ecc4f5 | 4642 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4643 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4644 | { |
4645 | int itmp; | |
4646 | char ctmp; | |
a25694b4 | 4647 | long ltmp; |
7c8a8b04 | 4648 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4649 | |
4650 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4651 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4652 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4653 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4654 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4655 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4656 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4657 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4658 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4659 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4660 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4661 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4662 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4663 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4664 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4665 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4666 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4667 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4668 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4669 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4670 | (unsigned long) ltmp); | |
4671 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4672 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4673 | (unsigned long) ltmp); | |
4674 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4675 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4676 | (unsigned long) ltmp); | |
4677 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4678 | printf_filtered (_("Major faults, children: %lu\n"), | |
4679 | (unsigned long) ltmp); | |
4680 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4681 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4682 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4683 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4684 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4685 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4686 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4687 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4688 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4689 | printf_filtered (_("jiffies remaining in current time slice: %ld\n"), | |
4690 | ltmp); | |
4691 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4692 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4693 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4694 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4695 | (unsigned long) ltmp); | |
4696 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4697 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4698 | (unsigned long) ltmp); | |
4699 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4700 | printf_filtered (_("start time (jiffies since system boot): %ld\n"), | |
4701 | ltmp); | |
4702 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4703 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4704 | (unsigned long) ltmp); | |
4705 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4706 | printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp); | |
4707 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4708 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4709 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4710 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4711 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4712 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4713 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4714 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
dba24537 AC |
4715 | #if 0 /* Don't know how architecture-dependent the rest is... |
4716 | Anyway the signal bitmap info is available from "status". */ | |
a25694b4 AS |
4717 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
4718 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); | |
4719 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
4720 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); | |
4721 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4722 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
4723 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4724 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
4725 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4726 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
4727 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4728 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
4729 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
4730 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); | |
dba24537 | 4731 | #endif |
7c8a8b04 | 4732 | do_cleanups (cleanup); |
dba24537 AC |
4733 | } |
4734 | else | |
8a3fe4f8 | 4735 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4736 | } |
4737 | } | |
4738 | ||
10d6c8cd DJ |
4739 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
4740 | filesystem. Because we can use a single read() call for /proc, this | |
4741 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
4742 | but it doesn't support writes. */ | |
4743 | ||
4744 | static LONGEST | |
4745 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
4746 | const char *annex, gdb_byte *readbuf, | |
4747 | const gdb_byte *writebuf, | |
4748 | ULONGEST offset, LONGEST len) | |
dba24537 | 4749 | { |
10d6c8cd DJ |
4750 | LONGEST ret; |
4751 | int fd; | |
dba24537 AC |
4752 | char filename[64]; |
4753 | ||
10d6c8cd | 4754 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
4755 | return 0; |
4756 | ||
4757 | /* Don't bother for one word. */ | |
4758 | if (len < 3 * sizeof (long)) | |
4759 | return 0; | |
4760 | ||
4761 | /* We could keep this file open and cache it - possibly one per | |
4762 | thread. That requires some juggling, but is even faster. */ | |
4763 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
4764 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
4765 | if (fd == -1) | |
4766 | return 0; | |
4767 | ||
4768 | /* If pread64 is available, use it. It's faster if the kernel | |
4769 | supports it (only one syscall), and it's 64-bit safe even on | |
4770 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4771 | application). */ | |
4772 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4773 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4774 | #else |
10d6c8cd | 4775 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4776 | #endif |
4777 | ret = 0; | |
4778 | else | |
4779 | ret = len; | |
4780 | ||
4781 | close (fd); | |
4782 | return ret; | |
4783 | } | |
4784 | ||
efcbbd14 UW |
4785 | |
4786 | /* Enumerate spufs IDs for process PID. */ | |
4787 | static LONGEST | |
4788 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
4789 | { | |
4790 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
4791 | LONGEST pos = 0; | |
4792 | LONGEST written = 0; | |
4793 | char path[128]; | |
4794 | DIR *dir; | |
4795 | struct dirent *entry; | |
4796 | ||
4797 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4798 | dir = opendir (path); | |
4799 | if (!dir) | |
4800 | return -1; | |
4801 | ||
4802 | rewinddir (dir); | |
4803 | while ((entry = readdir (dir)) != NULL) | |
4804 | { | |
4805 | struct stat st; | |
4806 | struct statfs stfs; | |
4807 | int fd; | |
4808 | ||
4809 | fd = atoi (entry->d_name); | |
4810 | if (!fd) | |
4811 | continue; | |
4812 | ||
4813 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4814 | if (stat (path, &st) != 0) | |
4815 | continue; | |
4816 | if (!S_ISDIR (st.st_mode)) | |
4817 | continue; | |
4818 | ||
4819 | if (statfs (path, &stfs) != 0) | |
4820 | continue; | |
4821 | if (stfs.f_type != SPUFS_MAGIC) | |
4822 | continue; | |
4823 | ||
4824 | if (pos >= offset && pos + 4 <= offset + len) | |
4825 | { | |
4826 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
4827 | written += 4; | |
4828 | } | |
4829 | pos += 4; | |
4830 | } | |
4831 | ||
4832 | closedir (dir); | |
4833 | return written; | |
4834 | } | |
4835 | ||
4836 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4837 | object type, using the /proc file system. */ | |
4838 | static LONGEST | |
4839 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
4840 | const char *annex, gdb_byte *readbuf, | |
4841 | const gdb_byte *writebuf, | |
4842 | ULONGEST offset, LONGEST len) | |
4843 | { | |
4844 | char buf[128]; | |
4845 | int fd = 0; | |
4846 | int ret = -1; | |
4847 | int pid = PIDGET (inferior_ptid); | |
4848 | ||
4849 | if (!annex) | |
4850 | { | |
4851 | if (!readbuf) | |
4852 | return -1; | |
4853 | else | |
4854 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4855 | } | |
4856 | ||
4857 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
4858 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4859 | if (fd <= 0) | |
4860 | return -1; | |
4861 | ||
4862 | if (offset != 0 | |
4863 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4864 | { | |
4865 | close (fd); | |
4866 | return 0; | |
4867 | } | |
4868 | ||
4869 | if (writebuf) | |
4870 | ret = write (fd, writebuf, (size_t) len); | |
4871 | else if (readbuf) | |
4872 | ret = read (fd, readbuf, (size_t) len); | |
4873 | ||
4874 | close (fd); | |
4875 | return ret; | |
4876 | } | |
4877 | ||
4878 | ||
dba24537 AC |
4879 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
4880 | ||
4881 | static void | |
4882 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4883 | { | |
4884 | int len = strlen (line) - 1; | |
4885 | const char *p; | |
4886 | int signum; | |
4887 | ||
4888 | if (line[len] != '\n') | |
8a3fe4f8 | 4889 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4890 | |
4891 | p = line; | |
4892 | signum = len * 4; | |
4893 | while (len-- > 0) | |
4894 | { | |
4895 | int digit; | |
4896 | ||
4897 | if (*p >= '0' && *p <= '9') | |
4898 | digit = *p - '0'; | |
4899 | else if (*p >= 'a' && *p <= 'f') | |
4900 | digit = *p - 'a' + 10; | |
4901 | else | |
8a3fe4f8 | 4902 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4903 | |
4904 | signum -= 4; | |
4905 | ||
4906 | if (digit & 1) | |
4907 | sigaddset (sigs, signum + 1); | |
4908 | if (digit & 2) | |
4909 | sigaddset (sigs, signum + 2); | |
4910 | if (digit & 4) | |
4911 | sigaddset (sigs, signum + 3); | |
4912 | if (digit & 8) | |
4913 | sigaddset (sigs, signum + 4); | |
4914 | ||
4915 | p++; | |
4916 | } | |
4917 | } | |
4918 | ||
4919 | /* Find process PID's pending signals from /proc/pid/status and set | |
4920 | SIGS to match. */ | |
4921 | ||
4922 | void | |
4923 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
4924 | { | |
4925 | FILE *procfile; | |
4926 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
4927 | int signum; | |
7c8a8b04 | 4928 | struct cleanup *cleanup; |
dba24537 AC |
4929 | |
4930 | sigemptyset (pending); | |
4931 | sigemptyset (blocked); | |
4932 | sigemptyset (ignored); | |
4933 | sprintf (fname, "/proc/%d/status", pid); | |
4934 | procfile = fopen (fname, "r"); | |
4935 | if (procfile == NULL) | |
8a3fe4f8 | 4936 | error (_("Could not open %s"), fname); |
7c8a8b04 | 4937 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4938 | |
4939 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
4940 | { | |
4941 | /* Normal queued signals are on the SigPnd line in the status | |
4942 | file. However, 2.6 kernels also have a "shared" pending | |
4943 | queue for delivering signals to a thread group, so check for | |
4944 | a ShdPnd line also. | |
4945 | ||
4946 | Unfortunately some Red Hat kernels include the shared pending | |
4947 | queue but not the ShdPnd status field. */ | |
4948 | ||
4949 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
4950 | add_line_to_sigset (buffer + 8, pending); | |
4951 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
4952 | add_line_to_sigset (buffer + 8, pending); | |
4953 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
4954 | add_line_to_sigset (buffer + 8, blocked); | |
4955 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
4956 | add_line_to_sigset (buffer + 8, ignored); | |
4957 | } | |
4958 | ||
7c8a8b04 | 4959 | do_cleanups (cleanup); |
dba24537 AC |
4960 | } |
4961 | ||
07e059b5 VP |
4962 | static LONGEST |
4963 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
4964 | const char *annex, gdb_byte *readbuf, | |
4965 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4966 | { | |
4967 | /* We make the process list snapshot when the object starts to be | |
4968 | read. */ | |
4969 | static const char *buf; | |
4970 | static LONGEST len_avail = -1; | |
4971 | static struct obstack obstack; | |
4972 | ||
4973 | DIR *dirp; | |
4974 | ||
4975 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
4976 | ||
4977 | if (strcmp (annex, "processes") != 0) | |
4978 | return 0; | |
4979 | ||
4980 | gdb_assert (readbuf && !writebuf); | |
4981 | ||
4982 | if (offset == 0) | |
4983 | { | |
4984 | if (len_avail != -1 && len_avail != 0) | |
4985 | obstack_free (&obstack, NULL); | |
4986 | len_avail = 0; | |
4987 | buf = NULL; | |
4988 | obstack_init (&obstack); | |
4989 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
4990 | ||
4991 | dirp = opendir ("/proc"); | |
4992 | if (dirp) | |
4993 | { | |
4994 | struct dirent *dp; | |
4995 | while ((dp = readdir (dirp)) != NULL) | |
4996 | { | |
4997 | struct stat statbuf; | |
4998 | char procentry[sizeof ("/proc/4294967295")]; | |
4999 | ||
5000 | if (!isdigit (dp->d_name[0]) | |
1a6d2f2f | 5001 | || NAMELEN (dp) > sizeof ("4294967295") - 1) |
07e059b5 VP |
5002 | continue; |
5003 | ||
5004 | sprintf (procentry, "/proc/%s", dp->d_name); | |
5005 | if (stat (procentry, &statbuf) == 0 | |
5006 | && S_ISDIR (statbuf.st_mode)) | |
5007 | { | |
5008 | char *pathname; | |
5009 | FILE *f; | |
5010 | char cmd[MAXPATHLEN + 1]; | |
5011 | struct passwd *entry; | |
5012 | ||
5013 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
5014 | entry = getpwuid (statbuf.st_uid); | |
5015 | ||
5016 | if ((f = fopen (pathname, "r")) != NULL) | |
5017 | { | |
5018 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
5019 | if (len > 0) | |
5020 | { | |
5021 | int i; | |
5022 | for (i = 0; i < len; i++) | |
5023 | if (cmd[i] == '\0') | |
5024 | cmd[i] = ' '; | |
5025 | cmd[len] = '\0'; | |
5026 | ||
5027 | obstack_xml_printf ( | |
5028 | &obstack, | |
5029 | "<item>" | |
5030 | "<column name=\"pid\">%s</column>" | |
5031 | "<column name=\"user\">%s</column>" | |
5032 | "<column name=\"command\">%s</column>" | |
5033 | "</item>", | |
5034 | dp->d_name, | |
5035 | entry ? entry->pw_name : "?", | |
5036 | cmd); | |
5037 | } | |
5038 | fclose (f); | |
5039 | } | |
5040 | ||
5041 | xfree (pathname); | |
5042 | } | |
5043 | } | |
5044 | ||
5045 | closedir (dirp); | |
5046 | } | |
5047 | ||
5048 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
5049 | buf = obstack_finish (&obstack); | |
5050 | len_avail = strlen (buf); | |
5051 | } | |
5052 | ||
5053 | if (offset >= len_avail) | |
5054 | { | |
5055 | /* Done. Get rid of the obstack. */ | |
5056 | obstack_free (&obstack, NULL); | |
5057 | buf = NULL; | |
5058 | len_avail = 0; | |
5059 | return 0; | |
5060 | } | |
5061 | ||
5062 | if (len > len_avail - offset) | |
5063 | len = len_avail - offset; | |
5064 | memcpy (readbuf, buf + offset, len); | |
5065 | ||
5066 | return len; | |
5067 | } | |
5068 | ||
10d6c8cd DJ |
5069 | static LONGEST |
5070 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
5071 | const char *annex, gdb_byte *readbuf, | |
5072 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
5073 | { | |
5074 | LONGEST xfer; | |
5075 | ||
5076 | if (object == TARGET_OBJECT_AUXV) | |
9f2982ff | 5077 | return memory_xfer_auxv (ops, object, annex, readbuf, writebuf, |
10d6c8cd DJ |
5078 | offset, len); |
5079 | ||
07e059b5 VP |
5080 | if (object == TARGET_OBJECT_OSDATA) |
5081 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
5082 | offset, len); | |
5083 | ||
efcbbd14 UW |
5084 | if (object == TARGET_OBJECT_SPU) |
5085 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
5086 | offset, len); | |
5087 | ||
8f313923 JK |
5088 | /* GDB calculates all the addresses in possibly larget width of the address. |
5089 | Address width needs to be masked before its final use - either by | |
5090 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
5091 | ||
5092 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
5093 | ||
5094 | if (object == TARGET_OBJECT_MEMORY) | |
5095 | { | |
5096 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
5097 | ||
5098 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
5099 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
5100 | } | |
5101 | ||
10d6c8cd DJ |
5102 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
5103 | offset, len); | |
5104 | if (xfer != 0) | |
5105 | return xfer; | |
5106 | ||
5107 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
5108 | offset, len); | |
5109 | } | |
5110 | ||
e9efe249 | 5111 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
5112 | it with local methods. */ |
5113 | ||
910122bf UW |
5114 | static void |
5115 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 5116 | { |
6d8fd2b7 UW |
5117 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
5118 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; | |
5119 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; | |
a96d9b2e | 5120 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 5121 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 5122 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
5123 | t->to_post_attach = linux_child_post_attach; |
5124 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
5125 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
5126 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
5127 | ||
5128 | super_xfer_partial = t->to_xfer_partial; | |
5129 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
5130 | } |
5131 | ||
5132 | struct target_ops * | |
5133 | linux_target (void) | |
5134 | { | |
5135 | struct target_ops *t; | |
5136 | ||
5137 | t = inf_ptrace_target (); | |
5138 | linux_target_install_ops (t); | |
5139 | ||
5140 | return t; | |
5141 | } | |
5142 | ||
5143 | struct target_ops * | |
7714d83a | 5144 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
5145 | { |
5146 | struct target_ops *t; | |
5147 | ||
5148 | t = inf_ptrace_trad_target (register_u_offset); | |
5149 | linux_target_install_ops (t); | |
10d6c8cd | 5150 | |
10d6c8cd DJ |
5151 | return t; |
5152 | } | |
5153 | ||
b84876c2 PA |
5154 | /* target_is_async_p implementation. */ |
5155 | ||
5156 | static int | |
5157 | linux_nat_is_async_p (void) | |
5158 | { | |
5159 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5160 | it explicitly with the "set target-async" command. |
b84876c2 | 5161 | Someday, linux will always be async. */ |
c6ebd6cf | 5162 | if (!target_async_permitted) |
b84876c2 PA |
5163 | return 0; |
5164 | ||
d90e17a7 PA |
5165 | /* See target.h/target_async_mask. */ |
5166 | return linux_nat_async_mask_value; | |
b84876c2 PA |
5167 | } |
5168 | ||
5169 | /* target_can_async_p implementation. */ | |
5170 | ||
5171 | static int | |
5172 | linux_nat_can_async_p (void) | |
5173 | { | |
5174 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5175 | it explicitly with the "set target-async" command. |
b84876c2 | 5176 | Someday, linux will always be async. */ |
c6ebd6cf | 5177 | if (!target_async_permitted) |
b84876c2 PA |
5178 | return 0; |
5179 | ||
5180 | /* See target.h/target_async_mask. */ | |
5181 | return linux_nat_async_mask_value; | |
5182 | } | |
5183 | ||
9908b566 VP |
5184 | static int |
5185 | linux_nat_supports_non_stop (void) | |
5186 | { | |
5187 | return 1; | |
5188 | } | |
5189 | ||
d90e17a7 PA |
5190 | /* True if we want to support multi-process. To be removed when GDB |
5191 | supports multi-exec. */ | |
5192 | ||
2277426b | 5193 | int linux_multi_process = 1; |
d90e17a7 PA |
5194 | |
5195 | static int | |
5196 | linux_nat_supports_multi_process (void) | |
5197 | { | |
5198 | return linux_multi_process; | |
5199 | } | |
5200 | ||
b84876c2 PA |
5201 | /* target_async_mask implementation. */ |
5202 | ||
5203 | static int | |
7feb7d06 | 5204 | linux_nat_async_mask (int new_mask) |
b84876c2 | 5205 | { |
7feb7d06 | 5206 | int curr_mask = linux_nat_async_mask_value; |
b84876c2 | 5207 | |
7feb7d06 | 5208 | if (curr_mask != new_mask) |
b84876c2 | 5209 | { |
7feb7d06 | 5210 | if (new_mask == 0) |
b84876c2 PA |
5211 | { |
5212 | linux_nat_async (NULL, 0); | |
7feb7d06 | 5213 | linux_nat_async_mask_value = new_mask; |
b84876c2 PA |
5214 | } |
5215 | else | |
5216 | { | |
7feb7d06 | 5217 | linux_nat_async_mask_value = new_mask; |
84e46146 | 5218 | |
7feb7d06 PA |
5219 | /* If we're going out of async-mask in all-stop, then the |
5220 | inferior is stopped. The next resume will call | |
5221 | target_async. In non-stop, the target event source | |
5222 | should be always registered in the event loop. Do so | |
5223 | now. */ | |
5224 | if (non_stop) | |
5225 | linux_nat_async (inferior_event_handler, 0); | |
b84876c2 PA |
5226 | } |
5227 | } | |
5228 | ||
7feb7d06 | 5229 | return curr_mask; |
b84876c2 PA |
5230 | } |
5231 | ||
5232 | static int async_terminal_is_ours = 1; | |
5233 | ||
5234 | /* target_terminal_inferior implementation. */ | |
5235 | ||
5236 | static void | |
5237 | linux_nat_terminal_inferior (void) | |
5238 | { | |
5239 | if (!target_is_async_p ()) | |
5240 | { | |
5241 | /* Async mode is disabled. */ | |
5242 | terminal_inferior (); | |
5243 | return; | |
5244 | } | |
5245 | ||
b84876c2 PA |
5246 | terminal_inferior (); |
5247 | ||
d9d2d8b6 | 5248 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
5249 | if (!async_terminal_is_ours) |
5250 | return; | |
5251 | ||
5252 | delete_file_handler (input_fd); | |
5253 | async_terminal_is_ours = 0; | |
5254 | set_sigint_trap (); | |
5255 | } | |
5256 | ||
5257 | /* target_terminal_ours implementation. */ | |
5258 | ||
2c0b251b | 5259 | static void |
b84876c2 PA |
5260 | linux_nat_terminal_ours (void) |
5261 | { | |
5262 | if (!target_is_async_p ()) | |
5263 | { | |
5264 | /* Async mode is disabled. */ | |
5265 | terminal_ours (); | |
5266 | return; | |
5267 | } | |
5268 | ||
5269 | /* GDB should never give the terminal to the inferior if the | |
5270 | inferior is running in the background (run&, continue&, etc.), | |
5271 | but claiming it sure should. */ | |
5272 | terminal_ours (); | |
5273 | ||
b84876c2 PA |
5274 | if (async_terminal_is_ours) |
5275 | return; | |
5276 | ||
5277 | clear_sigint_trap (); | |
5278 | add_file_handler (input_fd, stdin_event_handler, 0); | |
5279 | async_terminal_is_ours = 1; | |
5280 | } | |
5281 | ||
5282 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
5283 | void *context); | |
5284 | static void *async_client_context; | |
5285 | ||
7feb7d06 PA |
5286 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5287 | so we notice when any child changes state, and notify the | |
5288 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
5289 | above to wait for the arrival of a SIGCHLD. */ | |
5290 | ||
b84876c2 | 5291 | static void |
7feb7d06 | 5292 | sigchld_handler (int signo) |
b84876c2 | 5293 | { |
7feb7d06 PA |
5294 | int old_errno = errno; |
5295 | ||
5296 | if (debug_linux_nat_async) | |
5297 | fprintf_unfiltered (gdb_stdlog, "sigchld\n"); | |
5298 | ||
5299 | if (signo == SIGCHLD | |
5300 | && linux_nat_event_pipe[0] != -1) | |
5301 | async_file_mark (); /* Let the event loop know that there are | |
5302 | events to handle. */ | |
5303 | ||
5304 | errno = old_errno; | |
5305 | } | |
5306 | ||
5307 | /* Callback registered with the target events file descriptor. */ | |
5308 | ||
5309 | static void | |
5310 | handle_target_event (int error, gdb_client_data client_data) | |
5311 | { | |
5312 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
5313 | } | |
5314 | ||
5315 | /* Create/destroy the target events pipe. Returns previous state. */ | |
5316 | ||
5317 | static int | |
5318 | linux_async_pipe (int enable) | |
5319 | { | |
5320 | int previous = (linux_nat_event_pipe[0] != -1); | |
5321 | ||
5322 | if (previous != enable) | |
5323 | { | |
5324 | sigset_t prev_mask; | |
5325 | ||
5326 | block_child_signals (&prev_mask); | |
5327 | ||
5328 | if (enable) | |
5329 | { | |
5330 | if (pipe (linux_nat_event_pipe) == -1) | |
5331 | internal_error (__FILE__, __LINE__, | |
5332 | "creating event pipe failed."); | |
5333 | ||
5334 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5335 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5336 | } | |
5337 | else | |
5338 | { | |
5339 | close (linux_nat_event_pipe[0]); | |
5340 | close (linux_nat_event_pipe[1]); | |
5341 | linux_nat_event_pipe[0] = -1; | |
5342 | linux_nat_event_pipe[1] = -1; | |
5343 | } | |
5344 | ||
5345 | restore_child_signals_mask (&prev_mask); | |
5346 | } | |
5347 | ||
5348 | return previous; | |
b84876c2 PA |
5349 | } |
5350 | ||
5351 | /* target_async implementation. */ | |
5352 | ||
5353 | static void | |
5354 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
5355 | void *context), void *context) | |
5356 | { | |
c6ebd6cf | 5357 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
5358 | internal_error (__FILE__, __LINE__, |
5359 | "Calling target_async when async is masked"); | |
5360 | ||
5361 | if (callback != NULL) | |
5362 | { | |
5363 | async_client_callback = callback; | |
5364 | async_client_context = context; | |
7feb7d06 PA |
5365 | if (!linux_async_pipe (1)) |
5366 | { | |
5367 | add_file_handler (linux_nat_event_pipe[0], | |
5368 | handle_target_event, NULL); | |
5369 | /* There may be pending events to handle. Tell the event loop | |
5370 | to poll them. */ | |
5371 | async_file_mark (); | |
5372 | } | |
b84876c2 PA |
5373 | } |
5374 | else | |
5375 | { | |
5376 | async_client_callback = callback; | |
5377 | async_client_context = context; | |
b84876c2 | 5378 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 5379 | linux_async_pipe (0); |
b84876c2 PA |
5380 | } |
5381 | return; | |
5382 | } | |
5383 | ||
252fbfc8 PA |
5384 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
5385 | event came out. */ | |
5386 | ||
4c28f408 | 5387 | static int |
252fbfc8 | 5388 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 5389 | { |
d90e17a7 | 5390 | if (!lwp->stopped) |
252fbfc8 | 5391 | { |
d90e17a7 PA |
5392 | int pid, status; |
5393 | ptid_t ptid = lwp->ptid; | |
252fbfc8 | 5394 | |
d90e17a7 PA |
5395 | if (debug_linux_nat) |
5396 | fprintf_unfiltered (gdb_stdlog, | |
5397 | "LNSL: running -> suspending %s\n", | |
5398 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 5399 | |
252fbfc8 | 5400 | |
d90e17a7 PA |
5401 | stop_callback (lwp, NULL); |
5402 | stop_wait_callback (lwp, NULL); | |
252fbfc8 | 5403 | |
d90e17a7 PA |
5404 | /* If the lwp exits while we try to stop it, there's nothing |
5405 | else to do. */ | |
5406 | lwp = find_lwp_pid (ptid); | |
5407 | if (lwp == NULL) | |
5408 | return 0; | |
252fbfc8 | 5409 | |
d90e17a7 PA |
5410 | /* If we didn't collect any signal other than SIGSTOP while |
5411 | stopping the LWP, push a SIGNAL_0 event. In either case, the | |
5412 | event-loop will end up calling target_wait which will collect | |
5413 | these. */ | |
5414 | if (lwp->status == 0) | |
5415 | lwp->status = W_STOPCODE (0); | |
5416 | async_file_mark (); | |
5417 | } | |
5418 | else | |
5419 | { | |
5420 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 5421 | |
d90e17a7 PA |
5422 | if (debug_linux_nat) |
5423 | { | |
e09875d4 | 5424 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
d90e17a7 | 5425 | fprintf_unfiltered (gdb_stdlog, "\ |
252fbfc8 | 5426 | LNSL: already stopped/stop_requested %s\n", |
d90e17a7 PA |
5427 | target_pid_to_str (lwp->ptid)); |
5428 | else | |
5429 | fprintf_unfiltered (gdb_stdlog, "\ | |
252fbfc8 | 5430 | LNSL: already stopped/no stop_requested yet %s\n", |
d90e17a7 | 5431 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
5432 | } |
5433 | } | |
4c28f408 PA |
5434 | return 0; |
5435 | } | |
5436 | ||
5437 | static void | |
5438 | linux_nat_stop (ptid_t ptid) | |
5439 | { | |
5440 | if (non_stop) | |
d90e17a7 | 5441 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
5442 | else |
5443 | linux_ops->to_stop (ptid); | |
5444 | } | |
5445 | ||
d90e17a7 PA |
5446 | static void |
5447 | linux_nat_close (int quitting) | |
5448 | { | |
5449 | /* Unregister from the event loop. */ | |
5450 | if (target_is_async_p ()) | |
5451 | target_async (NULL, 0); | |
5452 | ||
5453 | /* Reset the async_masking. */ | |
5454 | linux_nat_async_mask_value = 1; | |
5455 | ||
5456 | if (linux_ops->to_close) | |
5457 | linux_ops->to_close (quitting); | |
5458 | } | |
5459 | ||
c0694254 PA |
5460 | /* When requests are passed down from the linux-nat layer to the |
5461 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
5462 | used. The address space pointer is stored in the inferior object, | |
5463 | but the common code that is passed such ptid can't tell whether | |
5464 | lwpid is a "main" process id or not (it assumes so). We reverse | |
5465 | look up the "main" process id from the lwp here. */ | |
5466 | ||
5467 | struct address_space * | |
5468 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) | |
5469 | { | |
5470 | struct lwp_info *lwp; | |
5471 | struct inferior *inf; | |
5472 | int pid; | |
5473 | ||
5474 | pid = GET_LWP (ptid); | |
5475 | if (GET_LWP (ptid) == 0) | |
5476 | { | |
5477 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
5478 | tgid. */ | |
5479 | lwp = find_lwp_pid (ptid); | |
5480 | pid = GET_PID (lwp->ptid); | |
5481 | } | |
5482 | else | |
5483 | { | |
5484 | /* A (pid,lwpid,0) ptid. */ | |
5485 | pid = GET_PID (ptid); | |
5486 | } | |
5487 | ||
5488 | inf = find_inferior_pid (pid); | |
5489 | gdb_assert (inf != NULL); | |
5490 | return inf->aspace; | |
5491 | } | |
5492 | ||
dc146f7c VP |
5493 | int |
5494 | linux_nat_core_of_thread_1 (ptid_t ptid) | |
5495 | { | |
5496 | struct cleanup *back_to; | |
5497 | char *filename; | |
5498 | FILE *f; | |
5499 | char *content = NULL; | |
5500 | char *p; | |
5501 | char *ts = 0; | |
5502 | int content_read = 0; | |
5503 | int i; | |
5504 | int core; | |
5505 | ||
5506 | filename = xstrprintf ("/proc/%d/task/%ld/stat", | |
5507 | GET_PID (ptid), GET_LWP (ptid)); | |
5508 | back_to = make_cleanup (xfree, filename); | |
5509 | ||
5510 | f = fopen (filename, "r"); | |
5511 | if (!f) | |
5512 | { | |
5513 | do_cleanups (back_to); | |
5514 | return -1; | |
5515 | } | |
5516 | ||
5517 | make_cleanup_fclose (f); | |
5518 | ||
5519 | for (;;) | |
5520 | { | |
5521 | int n; | |
5522 | content = xrealloc (content, content_read + 1024); | |
5523 | n = fread (content + content_read, 1, 1024, f); | |
5524 | content_read += n; | |
5525 | if (n < 1024) | |
5526 | { | |
5527 | content[content_read] = '\0'; | |
5528 | break; | |
5529 | } | |
5530 | } | |
5531 | ||
5532 | make_cleanup (xfree, content); | |
5533 | ||
5534 | p = strchr (content, '('); | |
5535 | p = strchr (p, ')') + 2; /* skip ")" and a whitespace. */ | |
5536 | ||
5537 | /* If the first field after program name has index 0, then core number is | |
5538 | the field with index 36. There's no constant for that anywhere. */ | |
5539 | p = strtok_r (p, " ", &ts); | |
5540 | for (i = 0; i != 36; ++i) | |
5541 | p = strtok_r (NULL, " ", &ts); | |
5542 | ||
5543 | if (sscanf (p, "%d", &core) == 0) | |
5544 | core = -1; | |
5545 | ||
5546 | do_cleanups (back_to); | |
5547 | ||
5548 | return core; | |
5549 | } | |
5550 | ||
5551 | /* Return the cached value of the processor core for thread PTID. */ | |
5552 | ||
5553 | int | |
5554 | linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid) | |
5555 | { | |
5556 | struct lwp_info *info = find_lwp_pid (ptid); | |
5557 | if (info) | |
5558 | return info->core; | |
5559 | return -1; | |
5560 | } | |
5561 | ||
f973ed9c DJ |
5562 | void |
5563 | linux_nat_add_target (struct target_ops *t) | |
5564 | { | |
f973ed9c DJ |
5565 | /* Save the provided single-threaded target. We save this in a separate |
5566 | variable because another target we've inherited from (e.g. inf-ptrace) | |
5567 | may have saved a pointer to T; we want to use it for the final | |
5568 | process stratum target. */ | |
5569 | linux_ops_saved = *t; | |
5570 | linux_ops = &linux_ops_saved; | |
5571 | ||
5572 | /* Override some methods for multithreading. */ | |
b84876c2 | 5573 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
5574 | t->to_attach = linux_nat_attach; |
5575 | t->to_detach = linux_nat_detach; | |
5576 | t->to_resume = linux_nat_resume; | |
5577 | t->to_wait = linux_nat_wait; | |
5578 | t->to_xfer_partial = linux_nat_xfer_partial; | |
5579 | t->to_kill = linux_nat_kill; | |
5580 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
5581 | t->to_thread_alive = linux_nat_thread_alive; | |
5582 | t->to_pid_to_str = linux_nat_pid_to_str; | |
5583 | t->to_has_thread_control = tc_schedlock; | |
c0694254 | 5584 | t->to_thread_address_space = linux_nat_thread_address_space; |
ebec9a0f PA |
5585 | t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint; |
5586 | t->to_stopped_data_address = linux_nat_stopped_data_address; | |
f973ed9c | 5587 | |
b84876c2 PA |
5588 | t->to_can_async_p = linux_nat_can_async_p; |
5589 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5590 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
5591 | t->to_async = linux_nat_async; |
5592 | t->to_async_mask = linux_nat_async_mask; | |
5593 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
5594 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5595 | t->to_close = linux_nat_close; |
b84876c2 | 5596 | |
4c28f408 PA |
5597 | /* Methods for non-stop support. */ |
5598 | t->to_stop = linux_nat_stop; | |
5599 | ||
d90e17a7 PA |
5600 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5601 | ||
dc146f7c VP |
5602 | t->to_core_of_thread = linux_nat_core_of_thread; |
5603 | ||
f973ed9c DJ |
5604 | /* We don't change the stratum; this target will sit at |
5605 | process_stratum and thread_db will set at thread_stratum. This | |
5606 | is a little strange, since this is a multi-threaded-capable | |
5607 | target, but we want to be on the stack below thread_db, and we | |
5608 | also want to be used for single-threaded processes. */ | |
5609 | ||
5610 | add_target (t); | |
f973ed9c DJ |
5611 | } |
5612 | ||
9f0bdab8 DJ |
5613 | /* Register a method to call whenever a new thread is attached. */ |
5614 | void | |
5615 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5616 | { | |
5617 | /* Save the pointer. We only support a single registered instance | |
5618 | of the GNU/Linux native target, so we do not need to map this to | |
5619 | T. */ | |
5620 | linux_nat_new_thread = new_thread; | |
5621 | } | |
5622 | ||
5b009018 PA |
5623 | /* Register a method that converts a siginfo object between the layout |
5624 | that ptrace returns, and the layout in the architecture of the | |
5625 | inferior. */ | |
5626 | void | |
5627 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5628 | int (*siginfo_fixup) (struct siginfo *, | |
5629 | gdb_byte *, | |
5630 | int)) | |
5631 | { | |
5632 | /* Save the pointer. */ | |
5633 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5634 | } | |
5635 | ||
9f0bdab8 DJ |
5636 | /* Return the saved siginfo associated with PTID. */ |
5637 | struct siginfo * | |
5638 | linux_nat_get_siginfo (ptid_t ptid) | |
5639 | { | |
5640 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5641 | ||
5642 | gdb_assert (lp != NULL); | |
5643 | ||
5644 | return &lp->siginfo; | |
5645 | } | |
5646 | ||
2c0b251b PA |
5647 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5648 | extern initialize_file_ftype _initialize_linux_nat; | |
5649 | ||
d6b0e80f AC |
5650 | void |
5651 | _initialize_linux_nat (void) | |
5652 | { | |
b84876c2 | 5653 | sigset_t mask; |
dba24537 | 5654 | |
1bedd215 AC |
5655 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
5656 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
5657 | Specify any process id, or use the program being debugged by default.\n\ |
5658 | Specify any of the following keywords for detailed info:\n\ | |
5659 | mappings -- list of mapped memory regions.\n\ | |
5660 | stat -- list a bunch of random process info.\n\ | |
5661 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 5662 | all -- list all available /proc info.")); |
d6b0e80f | 5663 | |
b84876c2 PA |
5664 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5665 | &debug_linux_nat, _("\ | |
5666 | Set debugging of GNU/Linux lwp module."), _("\ | |
5667 | Show debugging of GNU/Linux lwp module."), _("\ | |
5668 | Enables printf debugging output."), | |
5669 | NULL, | |
5670 | show_debug_linux_nat, | |
5671 | &setdebuglist, &showdebuglist); | |
5672 | ||
5673 | add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance, | |
5674 | &debug_linux_nat_async, _("\ | |
5675 | Set debugging of GNU/Linux async lwp module."), _("\ | |
5676 | Show debugging of GNU/Linux async lwp module."), _("\ | |
5677 | Enables printf debugging output."), | |
5678 | NULL, | |
5679 | show_debug_linux_nat_async, | |
5680 | &setdebuglist, &showdebuglist); | |
5681 | ||
b84876c2 | 5682 | /* Save this mask as the default. */ |
d6b0e80f AC |
5683 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5684 | ||
7feb7d06 PA |
5685 | /* Install a SIGCHLD handler. */ |
5686 | sigchld_action.sa_handler = sigchld_handler; | |
5687 | sigemptyset (&sigchld_action.sa_mask); | |
5688 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5689 | |
5690 | /* Make it the default. */ | |
7feb7d06 | 5691 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5692 | |
5693 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5694 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5695 | sigdelset (&suspend_mask, SIGCHLD); | |
5696 | ||
7feb7d06 | 5697 | sigemptyset (&blocked_mask); |
10568435 JK |
5698 | |
5699 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
5700 | &disable_randomization, _("\ | |
5701 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
5702 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
5703 | When this mode is on (which is the default), randomization of the virtual\n\ | |
5704 | address space is disabled. Standalone programs run with the randomization\n\ | |
5705 | enabled by default on some platforms."), | |
5706 | &set_disable_randomization, | |
5707 | &show_disable_randomization, | |
5708 | &setlist, &showlist); | |
d6b0e80f AC |
5709 | } |
5710 | \f | |
5711 | ||
5712 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5713 | the GNU/Linux Threads library and therefore doesn't really belong | |
5714 | here. */ | |
5715 | ||
5716 | /* Read variable NAME in the target and return its value if found. | |
5717 | Otherwise return zero. It is assumed that the type of the variable | |
5718 | is `int'. */ | |
5719 | ||
5720 | static int | |
5721 | get_signo (const char *name) | |
5722 | { | |
5723 | struct minimal_symbol *ms; | |
5724 | int signo; | |
5725 | ||
5726 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5727 | if (ms == NULL) | |
5728 | return 0; | |
5729 | ||
8e70166d | 5730 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5731 | sizeof (signo)) != 0) |
5732 | return 0; | |
5733 | ||
5734 | return signo; | |
5735 | } | |
5736 | ||
5737 | /* Return the set of signals used by the threads library in *SET. */ | |
5738 | ||
5739 | void | |
5740 | lin_thread_get_thread_signals (sigset_t *set) | |
5741 | { | |
5742 | struct sigaction action; | |
5743 | int restart, cancel; | |
5744 | ||
b84876c2 | 5745 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5746 | sigemptyset (set); |
5747 | ||
5748 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5749 | cancel = get_signo ("__pthread_sig_cancel"); |
5750 | ||
5751 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5752 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5753 | not provide any way for the debugger to query the signal numbers - | |
5754 | fortunately they don't change! */ | |
5755 | ||
d6b0e80f | 5756 | if (restart == 0) |
17fbb0bd | 5757 | restart = __SIGRTMIN; |
d6b0e80f | 5758 | |
d6b0e80f | 5759 | if (cancel == 0) |
17fbb0bd | 5760 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5761 | |
5762 | sigaddset (set, restart); | |
5763 | sigaddset (set, cancel); | |
5764 | ||
5765 | /* The GNU/Linux Threads library makes terminating threads send a | |
5766 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
5767 | those (to prevent them from terminating GDB itself, which is | |
5768 | likely to be their default action) and treat them the same way as | |
5769 | SIGCHLD. */ | |
5770 | ||
5771 | action.sa_handler = sigchld_handler; | |
5772 | sigemptyset (&action.sa_mask); | |
58aecb61 | 5773 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
5774 | sigaction (cancel, &action, NULL); |
5775 | ||
5776 | /* We block the "cancel" signal throughout this code ... */ | |
5777 | sigaddset (&blocked_mask, cancel); | |
5778 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
5779 | ||
5780 | /* ... except during a sigsuspend. */ | |
5781 | sigdelset (&suspend_mask, cancel); | |
5782 | } |