Commit | Line | Data |
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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
e26af52f DJ |
3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 |
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 | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
19 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
3993f6b1 DJ |
22 | |
23 | #include "defs.h" | |
24 | #include "inferior.h" | |
25 | #include "target.h" | |
d6b0e80f | 26 | #include "gdb_string.h" |
3993f6b1 | 27 | #include "gdb_wait.h" |
d6b0e80f AC |
28 | #include "gdb_assert.h" |
29 | #ifdef HAVE_TKILL_SYSCALL | |
30 | #include <unistd.h> | |
31 | #include <sys/syscall.h> | |
32 | #endif | |
3993f6b1 | 33 | #include <sys/ptrace.h> |
0274a8ce | 34 | #include "linux-nat.h" |
ac264b3b | 35 | #include "linux-fork.h" |
d6b0e80f AC |
36 | #include "gdbthread.h" |
37 | #include "gdbcmd.h" | |
38 | #include "regcache.h" | |
10d6c8cd DJ |
39 | #include "inf-ptrace.h" |
40 | #include "auxv.h" | |
dba24537 AC |
41 | #include <sys/param.h> /* for MAXPATHLEN */ |
42 | #include <sys/procfs.h> /* for elf_gregset etc. */ | |
43 | #include "elf-bfd.h" /* for elfcore_write_* */ | |
44 | #include "gregset.h" /* for gregset */ | |
45 | #include "gdbcore.h" /* for get_exec_file */ | |
46 | #include <ctype.h> /* for isdigit */ | |
47 | #include "gdbthread.h" /* for struct thread_info etc. */ | |
48 | #include "gdb_stat.h" /* for struct stat */ | |
49 | #include <fcntl.h> /* for O_RDONLY */ | |
50 | ||
51 | #ifndef O_LARGEFILE | |
52 | #define O_LARGEFILE 0 | |
53 | #endif | |
0274a8ce | 54 | |
3993f6b1 DJ |
55 | /* If the system headers did not provide the constants, hard-code the normal |
56 | values. */ | |
57 | #ifndef PTRACE_EVENT_FORK | |
58 | ||
59 | #define PTRACE_SETOPTIONS 0x4200 | |
60 | #define PTRACE_GETEVENTMSG 0x4201 | |
61 | ||
62 | /* options set using PTRACE_SETOPTIONS */ | |
63 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
64 | #define PTRACE_O_TRACEFORK 0x00000002 | |
65 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
66 | #define PTRACE_O_TRACECLONE 0x00000008 | |
67 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
9016a515 DJ |
68 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
69 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
3993f6b1 DJ |
70 | |
71 | /* Wait extended result codes for the above trace options. */ | |
72 | #define PTRACE_EVENT_FORK 1 | |
73 | #define PTRACE_EVENT_VFORK 2 | |
74 | #define PTRACE_EVENT_CLONE 3 | |
75 | #define PTRACE_EVENT_EXEC 4 | |
c874c7fc | 76 | #define PTRACE_EVENT_VFORK_DONE 5 |
9016a515 | 77 | #define PTRACE_EVENT_EXIT 6 |
3993f6b1 DJ |
78 | |
79 | #endif /* PTRACE_EVENT_FORK */ | |
80 | ||
81 | /* We can't always assume that this flag is available, but all systems | |
82 | with the ptrace event handlers also have __WALL, so it's safe to use | |
83 | here. */ | |
84 | #ifndef __WALL | |
85 | #define __WALL 0x40000000 /* Wait for any child. */ | |
86 | #endif | |
87 | ||
10d6c8cd DJ |
88 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
89 | the use of the multi-threaded target. */ | |
90 | static struct target_ops *linux_ops; | |
91 | ||
ac264b3b MS |
92 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
93 | Called by our to_xfer_partial. */ | |
94 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
95 | enum target_object, | |
96 | const char *, gdb_byte *, | |
97 | const gdb_byte *, | |
10d6c8cd DJ |
98 | ULONGEST, LONGEST); |
99 | ||
ac264b3b MS |
100 | /* The saved to_mourn_inferior method, inherited from inf-ptrace.c. |
101 | Called by our to_mourn_inferior. */ | |
102 | static void (*super_mourn_inferior) (void); | |
103 | ||
d6b0e80f | 104 | static int debug_linux_nat; |
920d2a44 AC |
105 | static void |
106 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
107 | struct cmd_list_element *c, const char *value) | |
108 | { | |
109 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
110 | value); | |
111 | } | |
d6b0e80f | 112 | |
9016a515 DJ |
113 | static int linux_parent_pid; |
114 | ||
ae087d01 DJ |
115 | struct simple_pid_list |
116 | { | |
117 | int pid; | |
118 | struct simple_pid_list *next; | |
119 | }; | |
120 | struct simple_pid_list *stopped_pids; | |
121 | ||
3993f6b1 DJ |
122 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
123 | can not be used, 1 if it can. */ | |
124 | ||
125 | static int linux_supports_tracefork_flag = -1; | |
126 | ||
9016a515 DJ |
127 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
128 | PTRACE_O_TRACEVFORKDONE. */ | |
129 | ||
130 | static int linux_supports_tracevforkdone_flag = -1; | |
131 | ||
ae087d01 DJ |
132 | \f |
133 | /* Trivial list manipulation functions to keep track of a list of | |
134 | new stopped processes. */ | |
135 | static void | |
136 | add_to_pid_list (struct simple_pid_list **listp, int pid) | |
137 | { | |
138 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
139 | new_pid->pid = pid; | |
140 | new_pid->next = *listp; | |
141 | *listp = new_pid; | |
142 | } | |
143 | ||
144 | static int | |
145 | pull_pid_from_list (struct simple_pid_list **listp, int pid) | |
146 | { | |
147 | struct simple_pid_list **p; | |
148 | ||
149 | for (p = listp; *p != NULL; p = &(*p)->next) | |
150 | if ((*p)->pid == pid) | |
151 | { | |
152 | struct simple_pid_list *next = (*p)->next; | |
153 | xfree (*p); | |
154 | *p = next; | |
155 | return 1; | |
156 | } | |
157 | return 0; | |
158 | } | |
159 | ||
160 | void | |
161 | linux_record_stopped_pid (int pid) | |
162 | { | |
163 | add_to_pid_list (&stopped_pids, pid); | |
164 | } | |
165 | ||
3993f6b1 DJ |
166 | \f |
167 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
168 | ||
169 | static void | |
170 | linux_tracefork_child (void) | |
171 | { | |
172 | int ret; | |
173 | ||
174 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
175 | kill (getpid (), SIGSTOP); | |
176 | fork (); | |
48bb3cce | 177 | _exit (0); |
3993f6b1 DJ |
178 | } |
179 | ||
b957e937 DJ |
180 | /* Wrapper function for waitpid which handles EINTR. */ |
181 | ||
182 | static int | |
183 | my_waitpid (int pid, int *status, int flags) | |
184 | { | |
185 | int ret; | |
186 | do | |
187 | { | |
188 | ret = waitpid (pid, status, flags); | |
189 | } | |
190 | while (ret == -1 && errno == EINTR); | |
191 | ||
192 | return ret; | |
193 | } | |
194 | ||
195 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
196 | ||
197 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
198 | we know that the feature is not available. This may change the tracing | |
199 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
200 | ||
201 | However, if it succeeds, we don't know for sure that the feature is | |
202 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 203 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
204 | fork tracing, and let it fork. If the process exits, we assume that we |
205 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
206 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
207 | |
208 | static void | |
b957e937 | 209 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
210 | { |
211 | int child_pid, ret, status; | |
212 | long second_pid; | |
213 | ||
b957e937 DJ |
214 | linux_supports_tracefork_flag = 0; |
215 | linux_supports_tracevforkdone_flag = 0; | |
216 | ||
217 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
218 | if (ret != 0) | |
219 | return; | |
220 | ||
3993f6b1 DJ |
221 | child_pid = fork (); |
222 | if (child_pid == -1) | |
e2e0b3e5 | 223 | perror_with_name (("fork")); |
3993f6b1 DJ |
224 | |
225 | if (child_pid == 0) | |
226 | linux_tracefork_child (); | |
227 | ||
b957e937 | 228 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 229 | if (ret == -1) |
e2e0b3e5 | 230 | perror_with_name (("waitpid")); |
3993f6b1 | 231 | else if (ret != child_pid) |
8a3fe4f8 | 232 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 233 | if (! WIFSTOPPED (status)) |
8a3fe4f8 | 234 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status); |
3993f6b1 | 235 | |
3993f6b1 DJ |
236 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
237 | if (ret != 0) | |
238 | { | |
b957e937 DJ |
239 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
240 | if (ret != 0) | |
241 | { | |
8a3fe4f8 | 242 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 DJ |
243 | return; |
244 | } | |
245 | ||
246 | ret = my_waitpid (child_pid, &status, 0); | |
247 | if (ret != child_pid) | |
8a3fe4f8 | 248 | warning (_("linux_test_for_tracefork: failed to wait for killed child")); |
b957e937 | 249 | else if (!WIFSIGNALED (status)) |
8a3fe4f8 AC |
250 | warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from " |
251 | "killed child"), status); | |
b957e937 | 252 | |
3993f6b1 DJ |
253 | return; |
254 | } | |
255 | ||
9016a515 DJ |
256 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
257 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
258 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
259 | linux_supports_tracevforkdone_flag = (ret == 0); | |
260 | ||
b957e937 DJ |
261 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
262 | if (ret != 0) | |
8a3fe4f8 | 263 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
264 | |
265 | ret = my_waitpid (child_pid, &status, 0); | |
266 | ||
3993f6b1 DJ |
267 | if (ret == child_pid && WIFSTOPPED (status) |
268 | && status >> 16 == PTRACE_EVENT_FORK) | |
269 | { | |
270 | second_pid = 0; | |
271 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
272 | if (ret == 0 && second_pid != 0) | |
273 | { | |
274 | int second_status; | |
275 | ||
276 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
277 | my_waitpid (second_pid, &second_status, 0); |
278 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
279 | if (ret != 0) | |
8a3fe4f8 | 280 | warning (_("linux_test_for_tracefork: failed to kill second child")); |
3993f6b1 DJ |
281 | } |
282 | } | |
b957e937 | 283 | else |
8a3fe4f8 AC |
284 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
285 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 286 | |
b957e937 DJ |
287 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
288 | if (ret != 0) | |
8a3fe4f8 | 289 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 290 | my_waitpid (child_pid, &status, 0); |
3993f6b1 DJ |
291 | } |
292 | ||
293 | /* Return non-zero iff we have tracefork functionality available. | |
294 | This function also sets linux_supports_tracefork_flag. */ | |
295 | ||
296 | static int | |
b957e937 | 297 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
298 | { |
299 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 300 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
301 | return linux_supports_tracefork_flag; |
302 | } | |
303 | ||
9016a515 | 304 | static int |
b957e937 | 305 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
306 | { |
307 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 308 | linux_test_for_tracefork (pid); |
9016a515 DJ |
309 | return linux_supports_tracevforkdone_flag; |
310 | } | |
311 | ||
3993f6b1 | 312 | \f |
4de4c07c DJ |
313 | void |
314 | linux_enable_event_reporting (ptid_t ptid) | |
315 | { | |
d3587048 | 316 | int pid = ptid_get_lwp (ptid); |
4de4c07c DJ |
317 | int options; |
318 | ||
d3587048 DJ |
319 | if (pid == 0) |
320 | pid = ptid_get_pid (ptid); | |
321 | ||
b957e937 | 322 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
323 | return; |
324 | ||
a2f23071 DJ |
325 | options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC |
326 | | PTRACE_O_TRACECLONE; | |
b957e937 | 327 | if (linux_supports_tracevforkdone (pid)) |
9016a515 DJ |
328 | options |= PTRACE_O_TRACEVFORKDONE; |
329 | ||
330 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
331 | read-only process state. */ | |
4de4c07c DJ |
332 | |
333 | ptrace (PTRACE_SETOPTIONS, pid, 0, options); | |
334 | } | |
335 | ||
336 | void | |
337 | child_post_attach (int pid) | |
338 | { | |
339 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
340 | } | |
341 | ||
10d6c8cd | 342 | static void |
4de4c07c DJ |
343 | linux_child_post_startup_inferior (ptid_t ptid) |
344 | { | |
345 | linux_enable_event_reporting (ptid); | |
346 | } | |
347 | ||
3993f6b1 | 348 | int |
ee057212 | 349 | child_follow_fork (struct target_ops *ops, int follow_child) |
3993f6b1 | 350 | { |
4de4c07c DJ |
351 | ptid_t last_ptid; |
352 | struct target_waitstatus last_status; | |
9016a515 | 353 | int has_vforked; |
4de4c07c DJ |
354 | int parent_pid, child_pid; |
355 | ||
356 | get_last_target_status (&last_ptid, &last_status); | |
9016a515 | 357 | has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); |
d3587048 DJ |
358 | parent_pid = ptid_get_lwp (last_ptid); |
359 | if (parent_pid == 0) | |
360 | parent_pid = ptid_get_pid (last_ptid); | |
4de4c07c DJ |
361 | child_pid = last_status.value.related_pid; |
362 | ||
363 | if (! follow_child) | |
364 | { | |
365 | /* We're already attached to the parent, by default. */ | |
366 | ||
367 | /* Before detaching from the child, remove all breakpoints from | |
368 | it. (This won't actually modify the breakpoint list, but will | |
369 | physically remove the breakpoints from the child.) */ | |
9016a515 DJ |
370 | /* If we vforked this will remove the breakpoints from the parent |
371 | also, but they'll be reinserted below. */ | |
4de4c07c DJ |
372 | detach_breakpoints (child_pid); |
373 | ||
ac264b3b MS |
374 | /* Detach new forked process? */ |
375 | if (detach_fork) | |
f75c00e4 | 376 | { |
ac264b3b MS |
377 | if (debug_linux_nat) |
378 | { | |
379 | target_terminal_ours (); | |
380 | fprintf_filtered (gdb_stdlog, | |
381 | "Detaching after fork from child process %d.\n", | |
382 | child_pid); | |
383 | } | |
4de4c07c | 384 | |
ac264b3b MS |
385 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
386 | } | |
387 | else | |
388 | { | |
389 | struct fork_info *fp; | |
390 | /* Retain child fork in ptrace (stopped) state. */ | |
391 | fp = find_fork_pid (child_pid); | |
392 | if (!fp) | |
393 | fp = add_fork (child_pid); | |
394 | fork_save_infrun_state (fp, 0); | |
395 | } | |
9016a515 DJ |
396 | |
397 | if (has_vforked) | |
398 | { | |
b957e937 DJ |
399 | gdb_assert (linux_supports_tracefork_flag >= 0); |
400 | if (linux_supports_tracevforkdone (0)) | |
9016a515 DJ |
401 | { |
402 | int status; | |
403 | ||
404 | ptrace (PTRACE_CONT, parent_pid, 0, 0); | |
58aecb61 | 405 | my_waitpid (parent_pid, &status, __WALL); |
c874c7fc | 406 | if ((status >> 16) != PTRACE_EVENT_VFORK_DONE) |
8a3fe4f8 AC |
407 | warning (_("Unexpected waitpid result %06x when waiting for " |
408 | "vfork-done"), status); | |
9016a515 DJ |
409 | } |
410 | else | |
411 | { | |
412 | /* We can't insert breakpoints until the child has | |
413 | finished with the shared memory region. We need to | |
414 | wait until that happens. Ideal would be to just | |
415 | call: | |
416 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
417 | - waitpid (parent_pid, &status, __WALL); | |
418 | However, most architectures can't handle a syscall | |
419 | being traced on the way out if it wasn't traced on | |
420 | the way in. | |
421 | ||
422 | We might also think to loop, continuing the child | |
423 | until it exits or gets a SIGTRAP. One problem is | |
424 | that the child might call ptrace with PTRACE_TRACEME. | |
425 | ||
426 | There's no simple and reliable way to figure out when | |
427 | the vforked child will be done with its copy of the | |
428 | shared memory. We could step it out of the syscall, | |
429 | two instructions, let it go, and then single-step the | |
430 | parent once. When we have hardware single-step, this | |
431 | would work; with software single-step it could still | |
432 | be made to work but we'd have to be able to insert | |
433 | single-step breakpoints in the child, and we'd have | |
434 | to insert -just- the single-step breakpoint in the | |
435 | parent. Very awkward. | |
436 | ||
437 | In the end, the best we can do is to make sure it | |
438 | runs for a little while. Hopefully it will be out of | |
439 | range of any breakpoints we reinsert. Usually this | |
440 | is only the single-step breakpoint at vfork's return | |
441 | point. */ | |
442 | ||
443 | usleep (10000); | |
444 | } | |
445 | ||
446 | /* Since we vforked, breakpoints were removed in the parent | |
447 | too. Put them back. */ | |
448 | reattach_breakpoints (parent_pid); | |
449 | } | |
4de4c07c | 450 | } |
3993f6b1 | 451 | else |
4de4c07c DJ |
452 | { |
453 | char child_pid_spelling[40]; | |
454 | ||
455 | /* Needed to keep the breakpoint lists in sync. */ | |
9016a515 DJ |
456 | if (! has_vforked) |
457 | detach_breakpoints (child_pid); | |
4de4c07c DJ |
458 | |
459 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
460 | remove_breakpoints (); | |
461 | ||
f75c00e4 DJ |
462 | if (debug_linux_nat) |
463 | { | |
464 | target_terminal_ours (); | |
ac264b3b MS |
465 | fprintf_filtered (gdb_stdlog, |
466 | "Attaching after fork to child process %d.\n", | |
467 | child_pid); | |
f75c00e4 | 468 | } |
4de4c07c | 469 | |
9016a515 DJ |
470 | /* If we're vforking, we may want to hold on to the parent until |
471 | the child exits or execs. At exec time we can remove the old | |
472 | breakpoints from the parent and detach it; at exit time we | |
473 | could do the same (or even, sneakily, resume debugging it - the | |
474 | child's exec has failed, or something similar). | |
475 | ||
476 | This doesn't clean up "properly", because we can't call | |
477 | target_detach, but that's OK; if the current target is "child", | |
478 | then it doesn't need any further cleanups, and lin_lwp will | |
479 | generally not encounter vfork (vfork is defined to fork | |
480 | in libpthread.so). | |
481 | ||
482 | The holding part is very easy if we have VFORKDONE events; | |
483 | but keeping track of both processes is beyond GDB at the | |
484 | moment. So we don't expose the parent to the rest of GDB. | |
485 | Instead we quietly hold onto it until such time as we can | |
486 | safely resume it. */ | |
487 | ||
488 | if (has_vforked) | |
489 | linux_parent_pid = parent_pid; | |
ac264b3b MS |
490 | else if (!detach_fork) |
491 | { | |
492 | struct fork_info *fp; | |
493 | /* Retain parent fork in ptrace (stopped) state. */ | |
494 | fp = find_fork_pid (parent_pid); | |
495 | if (!fp) | |
496 | fp = add_fork (parent_pid); | |
497 | fork_save_infrun_state (fp, 0); | |
498 | } | |
9016a515 | 499 | else |
ac264b3b MS |
500 | { |
501 | target_detach (NULL, 0); | |
502 | } | |
4de4c07c DJ |
503 | |
504 | inferior_ptid = pid_to_ptid (child_pid); | |
ee057212 DJ |
505 | |
506 | /* Reinstall ourselves, since we might have been removed in | |
507 | target_detach (which does other necessary cleanup). */ | |
ac264b3b | 508 | |
ee057212 | 509 | push_target (ops); |
4de4c07c DJ |
510 | |
511 | /* Reset breakpoints in the child as appropriate. */ | |
512 | follow_inferior_reset_breakpoints (); | |
513 | } | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | ptid_t | |
519 | linux_handle_extended_wait (int pid, int status, | |
520 | struct target_waitstatus *ourstatus) | |
521 | { | |
522 | int event = status >> 16; | |
523 | ||
a2f23071 DJ |
524 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
525 | || event == PTRACE_EVENT_CLONE) | |
4de4c07c DJ |
526 | { |
527 | unsigned long new_pid; | |
528 | int ret; | |
529 | ||
530 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
531 | ||
532 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
533 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
534 | { | |
535 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
a2f23071 | 536 | hits the SIGSTOP, but we're already attached. */ |
58aecb61 DJ |
537 | ret = my_waitpid (new_pid, &status, |
538 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
4de4c07c | 539 | if (ret == -1) |
e2e0b3e5 | 540 | perror_with_name (_("waiting for new child")); |
4de4c07c DJ |
541 | else if (ret != new_pid) |
542 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 543 | _("wait returned unexpected PID %d"), ret); |
4de4c07c DJ |
544 | else if (!WIFSTOPPED (status) || WSTOPSIG (status) != SIGSTOP) |
545 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 546 | _("wait returned unexpected status 0x%x"), status); |
4de4c07c DJ |
547 | } |
548 | ||
a2f23071 DJ |
549 | if (event == PTRACE_EVENT_FORK) |
550 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
551 | else if (event == PTRACE_EVENT_VFORK) | |
552 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
553 | else | |
554 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
555 | ||
4de4c07c DJ |
556 | ourstatus->value.related_pid = new_pid; |
557 | return inferior_ptid; | |
558 | } | |
559 | ||
9016a515 DJ |
560 | if (event == PTRACE_EVENT_EXEC) |
561 | { | |
562 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
563 | ourstatus->value.execd_pathname | |
564 | = xstrdup (child_pid_to_exec_file (pid)); | |
565 | ||
566 | if (linux_parent_pid) | |
567 | { | |
568 | detach_breakpoints (linux_parent_pid); | |
569 | ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0); | |
570 | ||
571 | linux_parent_pid = 0; | |
572 | } | |
573 | ||
574 | return inferior_ptid; | |
575 | } | |
576 | ||
4de4c07c | 577 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 578 | _("unknown ptrace event %d"), event); |
4de4c07c DJ |
579 | } |
580 | ||
581 | \f | |
fa113d1a | 582 | void |
4de4c07c DJ |
583 | child_insert_fork_catchpoint (int pid) |
584 | { | |
b957e937 | 585 | if (! linux_supports_tracefork (pid)) |
8a3fe4f8 | 586 | error (_("Your system does not support fork catchpoints.")); |
3993f6b1 DJ |
587 | } |
588 | ||
fa113d1a | 589 | void |
3993f6b1 DJ |
590 | child_insert_vfork_catchpoint (int pid) |
591 | { | |
b957e937 | 592 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 593 | error (_("Your system does not support vfork catchpoints.")); |
3993f6b1 DJ |
594 | } |
595 | ||
fa113d1a | 596 | void |
3993f6b1 DJ |
597 | child_insert_exec_catchpoint (int pid) |
598 | { | |
b957e937 | 599 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 600 | error (_("Your system does not support exec catchpoints.")); |
3993f6b1 DJ |
601 | } |
602 | ||
4de4c07c DJ |
603 | void |
604 | kill_inferior (void) | |
605 | { | |
606 | int status; | |
607 | int pid = PIDGET (inferior_ptid); | |
608 | struct target_waitstatus last; | |
609 | ptid_t last_ptid; | |
610 | int ret; | |
611 | ||
612 | if (pid == 0) | |
613 | return; | |
614 | ||
ac264b3b MS |
615 | /* First cut -- let's crudely do everything inline. */ |
616 | if (forks_exist_p ()) | |
4de4c07c | 617 | { |
ac264b3b MS |
618 | linux_fork_killall (); |
619 | pop_target (); | |
620 | generic_mourn_inferior (); | |
4de4c07c | 621 | } |
ac264b3b MS |
622 | else |
623 | { | |
624 | /* If we're stopped while forking and we haven't followed yet, | |
625 | kill the other task. We need to do this first because the | |
626 | parent will be sleeping if this is a vfork. */ | |
4de4c07c | 627 | |
ac264b3b | 628 | get_last_target_status (&last_ptid, &last); |
4de4c07c | 629 | |
ac264b3b MS |
630 | if (last.kind == TARGET_WAITKIND_FORKED |
631 | || last.kind == TARGET_WAITKIND_VFORKED) | |
632 | { | |
633 | ptrace (PT_KILL, last.value.related_pid, 0, 0); | |
634 | wait (&status); | |
635 | } | |
4de4c07c | 636 | |
ac264b3b | 637 | /* Kill the current process. */ |
de9a9e51 | 638 | ptrace (PT_KILL, pid, 0, 0); |
ee21b650 | 639 | ret = wait (&status); |
4de4c07c | 640 | |
ac264b3b MS |
641 | /* We might get a SIGCHLD instead of an exit status. This is |
642 | aggravated by the first kill above - a child has just died. */ | |
643 | ||
644 | while (ret == pid && WIFSTOPPED (status)) | |
645 | { | |
646 | ptrace (PT_KILL, pid, 0, 0); | |
647 | ret = wait (&status); | |
648 | } | |
649 | target_mourn_inferior (); | |
650 | } | |
4de4c07c | 651 | } |
d6b0e80f AC |
652 | |
653 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's | |
654 | are processes sharing the same VM space. A multi-threaded process | |
655 | is basically a group of such processes. However, such a grouping | |
656 | is almost entirely a user-space issue; the kernel doesn't enforce | |
657 | such a grouping at all (this might change in the future). In | |
658 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
659 | Threads library) to provide such a grouping. | |
660 | ||
661 | It is perfectly well possible to write a multi-threaded application | |
662 | without the assistance of a threads library, by using the clone | |
663 | system call directly. This module should be able to give some | |
664 | rudimentary support for debugging such applications if developers | |
665 | specify the CLONE_PTRACE flag in the clone system call, and are | |
666 | using the Linux kernel 2.4 or above. | |
667 | ||
668 | Note that there are some peculiarities in GNU/Linux that affect | |
669 | this code: | |
670 | ||
671 | - In general one should specify the __WCLONE flag to waitpid in | |
672 | order to make it report events for any of the cloned processes | |
673 | (and leave it out for the initial process). However, if a cloned | |
674 | process has exited the exit status is only reported if the | |
675 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
676 | we cannot use it since GDB must work on older systems too. | |
677 | ||
678 | - When a traced, cloned process exits and is waited for by the | |
679 | debugger, the kernel reassigns it to the original parent and | |
680 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
681 | library doesn't notice this, which leads to the "zombie problem": | |
682 | When debugged a multi-threaded process that spawns a lot of | |
683 | threads will run out of processes, even if the threads exit, | |
684 | because the "zombies" stay around. */ | |
685 | ||
686 | /* List of known LWPs. */ | |
687 | static struct lwp_info *lwp_list; | |
688 | ||
689 | /* Number of LWPs in the list. */ | |
690 | static int num_lwps; | |
691 | ||
692 | /* Non-zero if we're running in "threaded" mode. */ | |
693 | static int threaded; | |
694 | \f | |
695 | ||
696 | #define GET_LWP(ptid) ptid_get_lwp (ptid) | |
697 | #define GET_PID(ptid) ptid_get_pid (ptid) | |
698 | #define is_lwp(ptid) (GET_LWP (ptid) != 0) | |
699 | #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) | |
700 | ||
701 | /* If the last reported event was a SIGTRAP, this variable is set to | |
702 | the process id of the LWP/thread that got it. */ | |
703 | ptid_t trap_ptid; | |
704 | \f | |
705 | ||
706 | /* This module's target-specific operations. */ | |
707 | static struct target_ops linux_nat_ops; | |
708 | ||
d6b0e80f AC |
709 | /* Since we cannot wait (in linux_nat_wait) for the initial process and |
710 | any cloned processes with a single call to waitpid, we have to use | |
711 | the WNOHANG flag and call waitpid in a loop. To optimize | |
712 | things a bit we use `sigsuspend' to wake us up when a process has | |
713 | something to report (it will send us a SIGCHLD if it has). To make | |
714 | this work we have to juggle with the signal mask. We save the | |
715 | original signal mask such that we can restore it before creating a | |
716 | new process in order to avoid blocking certain signals in the | |
717 | inferior. We then block SIGCHLD during the waitpid/sigsuspend | |
718 | loop. */ | |
719 | ||
720 | /* Original signal mask. */ | |
721 | static sigset_t normal_mask; | |
722 | ||
723 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
724 | _initialize_linux_nat. */ | |
725 | static sigset_t suspend_mask; | |
726 | ||
727 | /* Signals to block to make that sigsuspend work. */ | |
728 | static sigset_t blocked_mask; | |
729 | \f | |
730 | ||
731 | /* Prototypes for local functions. */ | |
732 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
733 | static int linux_nat_thread_alive (ptid_t ptid); | |
734 | \f | |
735 | /* Convert wait status STATUS to a string. Used for printing debug | |
736 | messages only. */ | |
737 | ||
738 | static char * | |
739 | status_to_str (int status) | |
740 | { | |
741 | static char buf[64]; | |
742 | ||
743 | if (WIFSTOPPED (status)) | |
744 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
745 | strsignal (WSTOPSIG (status))); | |
746 | else if (WIFSIGNALED (status)) | |
747 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
748 | strsignal (WSTOPSIG (status))); | |
749 | else | |
750 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
751 | ||
752 | return buf; | |
753 | } | |
754 | ||
755 | /* Initialize the list of LWPs. Note that this module, contrary to | |
756 | what GDB's generic threads layer does for its thread list, | |
757 | re-initializes the LWP lists whenever we mourn or detach (which | |
758 | doesn't involve mourning) the inferior. */ | |
759 | ||
760 | static void | |
761 | init_lwp_list (void) | |
762 | { | |
763 | struct lwp_info *lp, *lpnext; | |
764 | ||
765 | for (lp = lwp_list; lp; lp = lpnext) | |
766 | { | |
767 | lpnext = lp->next; | |
768 | xfree (lp); | |
769 | } | |
770 | ||
771 | lwp_list = NULL; | |
772 | num_lwps = 0; | |
773 | threaded = 0; | |
774 | } | |
775 | ||
776 | /* Add the LWP specified by PID to the list. If this causes the | |
777 | number of LWPs to become larger than one, go into "threaded" mode. | |
778 | Return a pointer to the structure describing the new LWP. */ | |
779 | ||
780 | static struct lwp_info * | |
781 | add_lwp (ptid_t ptid) | |
782 | { | |
783 | struct lwp_info *lp; | |
784 | ||
785 | gdb_assert (is_lwp (ptid)); | |
786 | ||
787 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
788 | ||
789 | memset (lp, 0, sizeof (struct lwp_info)); | |
790 | ||
791 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
792 | ||
793 | lp->ptid = ptid; | |
794 | ||
795 | lp->next = lwp_list; | |
796 | lwp_list = lp; | |
797 | if (++num_lwps > 1) | |
798 | threaded = 1; | |
799 | ||
800 | return lp; | |
801 | } | |
802 | ||
803 | /* Remove the LWP specified by PID from the list. */ | |
804 | ||
805 | static void | |
806 | delete_lwp (ptid_t ptid) | |
807 | { | |
808 | struct lwp_info *lp, *lpprev; | |
809 | ||
810 | lpprev = NULL; | |
811 | ||
812 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
813 | if (ptid_equal (lp->ptid, ptid)) | |
814 | break; | |
815 | ||
816 | if (!lp) | |
817 | return; | |
818 | ||
819 | /* We don't go back to "non-threaded" mode if the number of threads | |
820 | becomes less than two. */ | |
821 | num_lwps--; | |
822 | ||
823 | if (lpprev) | |
824 | lpprev->next = lp->next; | |
825 | else | |
826 | lwp_list = lp->next; | |
827 | ||
828 | xfree (lp); | |
829 | } | |
830 | ||
831 | /* Return a pointer to the structure describing the LWP corresponding | |
832 | to PID. If no corresponding LWP could be found, return NULL. */ | |
833 | ||
834 | static struct lwp_info * | |
835 | find_lwp_pid (ptid_t ptid) | |
836 | { | |
837 | struct lwp_info *lp; | |
838 | int lwp; | |
839 | ||
840 | if (is_lwp (ptid)) | |
841 | lwp = GET_LWP (ptid); | |
842 | else | |
843 | lwp = GET_PID (ptid); | |
844 | ||
845 | for (lp = lwp_list; lp; lp = lp->next) | |
846 | if (lwp == GET_LWP (lp->ptid)) | |
847 | return lp; | |
848 | ||
849 | return NULL; | |
850 | } | |
851 | ||
852 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
853 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
854 | pointer to the structure describing that LWP immediately. | |
855 | Otherwise return NULL. */ | |
856 | ||
857 | struct lwp_info * | |
858 | iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data) | |
859 | { | |
860 | struct lwp_info *lp, *lpnext; | |
861 | ||
862 | for (lp = lwp_list; lp; lp = lpnext) | |
863 | { | |
864 | lpnext = lp->next; | |
865 | if ((*callback) (lp, data)) | |
866 | return lp; | |
867 | } | |
868 | ||
869 | return NULL; | |
870 | } | |
871 | ||
e26af52f DJ |
872 | /* Record a PTID for later deletion. */ |
873 | ||
874 | struct saved_ptids | |
875 | { | |
876 | ptid_t ptid; | |
877 | struct saved_ptids *next; | |
878 | }; | |
879 | static struct saved_ptids *threads_to_delete; | |
880 | ||
881 | static void | |
882 | record_dead_thread (ptid_t ptid) | |
883 | { | |
884 | struct saved_ptids *p = xmalloc (sizeof (struct saved_ptids)); | |
885 | p->ptid = ptid; | |
886 | p->next = threads_to_delete; | |
887 | threads_to_delete = p; | |
888 | } | |
889 | ||
890 | /* Delete any dead threads which are not the current thread. */ | |
891 | ||
892 | static void | |
893 | prune_lwps (void) | |
894 | { | |
895 | struct saved_ptids **p = &threads_to_delete; | |
896 | ||
897 | while (*p) | |
898 | if (! ptid_equal ((*p)->ptid, inferior_ptid)) | |
899 | { | |
900 | struct saved_ptids *tmp = *p; | |
901 | delete_thread (tmp->ptid); | |
902 | *p = tmp->next; | |
903 | xfree (tmp); | |
904 | } | |
905 | else | |
906 | p = &(*p)->next; | |
907 | } | |
908 | ||
909 | /* Callback for iterate_over_threads that finds a thread corresponding | |
910 | to the given LWP. */ | |
911 | ||
912 | static int | |
913 | find_thread_from_lwp (struct thread_info *thr, void *dummy) | |
914 | { | |
915 | ptid_t *ptid_p = dummy; | |
916 | ||
917 | if (GET_LWP (thr->ptid) && GET_LWP (thr->ptid) == GET_LWP (*ptid_p)) | |
918 | return 1; | |
919 | else | |
920 | return 0; | |
921 | } | |
922 | ||
923 | /* Handle the exit of a single thread LP. */ | |
924 | ||
925 | static void | |
926 | exit_lwp (struct lwp_info *lp) | |
927 | { | |
928 | if (in_thread_list (lp->ptid)) | |
929 | { | |
930 | /* Core GDB cannot deal with us deleting the current thread. */ | |
931 | if (!ptid_equal (lp->ptid, inferior_ptid)) | |
932 | delete_thread (lp->ptid); | |
933 | else | |
934 | record_dead_thread (lp->ptid); | |
935 | printf_unfiltered (_("[%s exited]\n"), | |
936 | target_pid_to_str (lp->ptid)); | |
937 | } | |
938 | else | |
939 | { | |
940 | /* Even if LP->PTID is not in the global GDB thread list, the | |
941 | LWP may be - with an additional thread ID. We don't need | |
942 | to print anything in this case; thread_db is in use and | |
943 | already took care of that. But it didn't delete the thread | |
944 | in order to handle zombies correctly. */ | |
945 | ||
946 | struct thread_info *thr; | |
947 | ||
948 | thr = iterate_over_threads (find_thread_from_lwp, &lp->ptid); | |
949 | if (thr && !ptid_equal (thr->ptid, inferior_ptid)) | |
950 | delete_thread (thr->ptid); | |
951 | else | |
952 | record_dead_thread (thr->ptid); | |
953 | } | |
954 | ||
955 | delete_lwp (lp->ptid); | |
956 | } | |
957 | ||
d6b0e80f AC |
958 | /* Attach to the LWP specified by PID. If VERBOSE is non-zero, print |
959 | a message telling the user that a new LWP has been added to the | |
960 | process. */ | |
961 | ||
962 | void | |
963 | lin_lwp_attach_lwp (ptid_t ptid, int verbose) | |
964 | { | |
965 | struct lwp_info *lp, *found_lp; | |
966 | ||
967 | gdb_assert (is_lwp (ptid)); | |
968 | ||
969 | /* Make sure SIGCHLD is blocked. We don't want SIGCHLD events | |
970 | to interrupt either the ptrace() or waitpid() calls below. */ | |
971 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
972 | { | |
973 | sigaddset (&blocked_mask, SIGCHLD); | |
974 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
975 | } | |
976 | ||
977 | if (verbose) | |
a3f17187 | 978 | printf_filtered (_("[New %s]\n"), target_pid_to_str (ptid)); |
d6b0e80f AC |
979 | |
980 | found_lp = lp = find_lwp_pid (ptid); | |
981 | if (lp == NULL) | |
982 | lp = add_lwp (ptid); | |
983 | ||
984 | /* We assume that we're already attached to any LWP that has an id | |
985 | equal to the overall process id, and to any LWP that is already | |
986 | in our list of LWPs. If we're not seeing exit events from threads | |
987 | and we've had PID wraparound since we last tried to stop all threads, | |
988 | this assumption might be wrong; fortunately, this is very unlikely | |
989 | to happen. */ | |
990 | if (GET_LWP (ptid) != GET_PID (ptid) && found_lp == NULL) | |
991 | { | |
992 | pid_t pid; | |
993 | int status; | |
994 | ||
995 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
8a3fe4f8 | 996 | error (_("Can't attach %s: %s"), target_pid_to_str (ptid), |
d6b0e80f AC |
997 | safe_strerror (errno)); |
998 | ||
999 | if (debug_linux_nat) | |
1000 | fprintf_unfiltered (gdb_stdlog, | |
1001 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1002 | target_pid_to_str (ptid)); | |
1003 | ||
58aecb61 | 1004 | pid = my_waitpid (GET_LWP (ptid), &status, 0); |
d6b0e80f AC |
1005 | if (pid == -1 && errno == ECHILD) |
1006 | { | |
1007 | /* Try again with __WCLONE to check cloned processes. */ | |
58aecb61 | 1008 | pid = my_waitpid (GET_LWP (ptid), &status, __WCLONE); |
d6b0e80f AC |
1009 | lp->cloned = 1; |
1010 | } | |
1011 | ||
1012 | gdb_assert (pid == GET_LWP (ptid) | |
1013 | && WIFSTOPPED (status) && WSTOPSIG (status)); | |
1014 | ||
1015 | child_post_attach (pid); | |
1016 | ||
1017 | lp->stopped = 1; | |
1018 | ||
1019 | if (debug_linux_nat) | |
1020 | { | |
1021 | fprintf_unfiltered (gdb_stdlog, | |
1022 | "LLAL: waitpid %s received %s\n", | |
1023 | target_pid_to_str (ptid), | |
1024 | status_to_str (status)); | |
1025 | } | |
1026 | } | |
1027 | else | |
1028 | { | |
1029 | /* We assume that the LWP representing the original process is | |
1030 | already stopped. Mark it as stopped in the data structure | |
1031 | that the linux ptrace layer uses to keep track of threads. | |
1032 | Note that this won't have already been done since the main | |
1033 | thread will have, we assume, been stopped by an attach from a | |
1034 | different layer. */ | |
1035 | lp->stopped = 1; | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | static void | |
1040 | linux_nat_attach (char *args, int from_tty) | |
1041 | { | |
1042 | struct lwp_info *lp; | |
1043 | pid_t pid; | |
1044 | int status; | |
1045 | ||
1046 | /* FIXME: We should probably accept a list of process id's, and | |
1047 | attach all of them. */ | |
10d6c8cd | 1048 | linux_ops->to_attach (args, from_tty); |
d6b0e80f AC |
1049 | |
1050 | /* Add the initial process as the first LWP to the list. */ | |
1051 | lp = add_lwp (BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid))); | |
1052 | ||
1053 | /* Make sure the initial process is stopped. The user-level threads | |
1054 | layer might want to poke around in the inferior, and that won't | |
1055 | work if things haven't stabilized yet. */ | |
58aecb61 | 1056 | pid = my_waitpid (GET_PID (inferior_ptid), &status, 0); |
d6b0e80f AC |
1057 | if (pid == -1 && errno == ECHILD) |
1058 | { | |
8a3fe4f8 | 1059 | warning (_("%s is a cloned process"), target_pid_to_str (inferior_ptid)); |
d6b0e80f AC |
1060 | |
1061 | /* Try again with __WCLONE to check cloned processes. */ | |
58aecb61 | 1062 | pid = my_waitpid (GET_PID (inferior_ptid), &status, __WCLONE); |
d6b0e80f AC |
1063 | lp->cloned = 1; |
1064 | } | |
1065 | ||
1066 | gdb_assert (pid == GET_PID (inferior_ptid) | |
1067 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP); | |
1068 | ||
1069 | lp->stopped = 1; | |
1070 | ||
1071 | /* Fake the SIGSTOP that core GDB expects. */ | |
1072 | lp->status = W_STOPCODE (SIGSTOP); | |
1073 | lp->resumed = 1; | |
1074 | if (debug_linux_nat) | |
1075 | { | |
1076 | fprintf_unfiltered (gdb_stdlog, | |
1077 | "LLA: waitpid %ld, faking SIGSTOP\n", (long) pid); | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | static int | |
1082 | detach_callback (struct lwp_info *lp, void *data) | |
1083 | { | |
1084 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1085 | ||
1086 | if (debug_linux_nat && lp->status) | |
1087 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1088 | strsignal (WSTOPSIG (lp->status)), | |
1089 | target_pid_to_str (lp->ptid)); | |
1090 | ||
1091 | while (lp->signalled && lp->stopped) | |
1092 | { | |
1093 | errno = 0; | |
1094 | if (ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, | |
1095 | WSTOPSIG (lp->status)) < 0) | |
8a3fe4f8 | 1096 | error (_("Can't continue %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1097 | safe_strerror (errno)); |
1098 | ||
1099 | if (debug_linux_nat) | |
1100 | fprintf_unfiltered (gdb_stdlog, | |
1101 | "DC: PTRACE_CONTINUE (%s, 0, %s) (OK)\n", | |
1102 | target_pid_to_str (lp->ptid), | |
1103 | status_to_str (lp->status)); | |
1104 | ||
1105 | lp->stopped = 0; | |
1106 | lp->signalled = 0; | |
1107 | lp->status = 0; | |
1108 | /* FIXME drow/2003-08-26: There was a call to stop_wait_callback | |
1109 | here. But since lp->signalled was cleared above, | |
1110 | stop_wait_callback didn't do anything; the process was left | |
1111 | running. Shouldn't we be waiting for it to stop? | |
1112 | I've removed the call, since stop_wait_callback now does do | |
1113 | something when called with lp->signalled == 0. */ | |
1114 | ||
1115 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1116 | } | |
1117 | ||
1118 | /* We don't actually detach from the LWP that has an id equal to the | |
1119 | overall process id just yet. */ | |
1120 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1121 | { | |
1122 | errno = 0; | |
1123 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
1124 | WSTOPSIG (lp->status)) < 0) | |
8a3fe4f8 | 1125 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1126 | safe_strerror (errno)); |
1127 | ||
1128 | if (debug_linux_nat) | |
1129 | fprintf_unfiltered (gdb_stdlog, | |
1130 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1131 | target_pid_to_str (lp->ptid), | |
1132 | strsignal (WSTOPSIG (lp->status))); | |
1133 | ||
1134 | delete_lwp (lp->ptid); | |
1135 | } | |
1136 | ||
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | static void | |
1141 | linux_nat_detach (char *args, int from_tty) | |
1142 | { | |
1143 | iterate_over_lwps (detach_callback, NULL); | |
1144 | ||
1145 | /* Only the initial process should be left right now. */ | |
1146 | gdb_assert (num_lwps == 1); | |
1147 | ||
1148 | trap_ptid = null_ptid; | |
1149 | ||
1150 | /* Destroy LWP info; it's no longer valid. */ | |
1151 | init_lwp_list (); | |
1152 | ||
1153 | /* Restore the original signal mask. */ | |
1154 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); | |
1155 | sigemptyset (&blocked_mask); | |
1156 | ||
1157 | inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); | |
10d6c8cd | 1158 | linux_ops->to_detach (args, from_tty); |
d6b0e80f AC |
1159 | } |
1160 | ||
1161 | /* Resume LP. */ | |
1162 | ||
1163 | static int | |
1164 | resume_callback (struct lwp_info *lp, void *data) | |
1165 | { | |
1166 | if (lp->stopped && lp->status == 0) | |
1167 | { | |
1168 | struct thread_info *tp; | |
1169 | ||
10d6c8cd DJ |
1170 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
1171 | 0, TARGET_SIGNAL_0); | |
d6b0e80f AC |
1172 | if (debug_linux_nat) |
1173 | fprintf_unfiltered (gdb_stdlog, | |
1174 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1175 | target_pid_to_str (lp->ptid)); | |
1176 | lp->stopped = 0; | |
1177 | lp->step = 0; | |
1178 | } | |
1179 | ||
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | static int | |
1184 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1185 | { | |
1186 | lp->resumed = 0; | |
1187 | return 0; | |
1188 | } | |
1189 | ||
1190 | static int | |
1191 | resume_set_callback (struct lwp_info *lp, void *data) | |
1192 | { | |
1193 | lp->resumed = 1; | |
1194 | return 0; | |
1195 | } | |
1196 | ||
1197 | static void | |
1198 | linux_nat_resume (ptid_t ptid, int step, enum target_signal signo) | |
1199 | { | |
1200 | struct lwp_info *lp; | |
1201 | int resume_all; | |
1202 | ||
76f50ad1 DJ |
1203 | if (debug_linux_nat) |
1204 | fprintf_unfiltered (gdb_stdlog, | |
1205 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1206 | step ? "step" : "resume", | |
1207 | target_pid_to_str (ptid), | |
1208 | signo ? strsignal (signo) : "0", | |
1209 | target_pid_to_str (inferior_ptid)); | |
1210 | ||
e26af52f DJ |
1211 | prune_lwps (); |
1212 | ||
d6b0e80f AC |
1213 | /* A specific PTID means `step only this process id'. */ |
1214 | resume_all = (PIDGET (ptid) == -1); | |
1215 | ||
1216 | if (resume_all) | |
1217 | iterate_over_lwps (resume_set_callback, NULL); | |
1218 | else | |
1219 | iterate_over_lwps (resume_clear_callback, NULL); | |
1220 | ||
1221 | /* If PID is -1, it's the current inferior that should be | |
1222 | handled specially. */ | |
1223 | if (PIDGET (ptid) == -1) | |
1224 | ptid = inferior_ptid; | |
1225 | ||
1226 | lp = find_lwp_pid (ptid); | |
1227 | if (lp) | |
1228 | { | |
1229 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
1230 | ||
1231 | /* Remember if we're stepping. */ | |
1232 | lp->step = step; | |
1233 | ||
1234 | /* Mark this LWP as resumed. */ | |
1235 | lp->resumed = 1; | |
1236 | ||
1237 | /* If we have a pending wait status for this thread, there is no | |
76f50ad1 DJ |
1238 | point in resuming the process. But first make sure that |
1239 | linux_nat_wait won't preemptively handle the event - we | |
1240 | should never take this short-circuit if we are going to | |
1241 | leave LP running, since we have skipped resuming all the | |
1242 | other threads. This bit of code needs to be synchronized | |
1243 | with linux_nat_wait. */ | |
1244 | ||
1245 | if (lp->status && WIFSTOPPED (lp->status)) | |
1246 | { | |
1247 | int saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1248 | ||
1249 | if (signal_stop_state (saved_signo) == 0 | |
1250 | && signal_print_state (saved_signo) == 0 | |
1251 | && signal_pass_state (saved_signo) == 1) | |
1252 | { | |
1253 | if (debug_linux_nat) | |
1254 | fprintf_unfiltered (gdb_stdlog, | |
1255 | "LLR: Not short circuiting for ignored " | |
1256 | "status 0x%x\n", lp->status); | |
1257 | ||
1258 | /* FIXME: What should we do if we are supposed to continue | |
1259 | this thread with a signal? */ | |
1260 | gdb_assert (signo == TARGET_SIGNAL_0); | |
1261 | signo = saved_signo; | |
1262 | lp->status = 0; | |
1263 | } | |
1264 | } | |
1265 | ||
d6b0e80f AC |
1266 | if (lp->status) |
1267 | { | |
1268 | /* FIXME: What should we do if we are supposed to continue | |
1269 | this thread with a signal? */ | |
1270 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 DJ |
1271 | |
1272 | if (debug_linux_nat) | |
1273 | fprintf_unfiltered (gdb_stdlog, | |
1274 | "LLR: Short circuiting for status 0x%x\n", | |
1275 | lp->status); | |
1276 | ||
d6b0e80f AC |
1277 | return; |
1278 | } | |
1279 | ||
1280 | /* Mark LWP as not stopped to prevent it from being continued by | |
1281 | resume_callback. */ | |
1282 | lp->stopped = 0; | |
1283 | } | |
1284 | ||
1285 | if (resume_all) | |
1286 | iterate_over_lwps (resume_callback, NULL); | |
1287 | ||
10d6c8cd | 1288 | linux_ops->to_resume (ptid, step, signo); |
d6b0e80f AC |
1289 | if (debug_linux_nat) |
1290 | fprintf_unfiltered (gdb_stdlog, | |
1291 | "LLR: %s %s, %s (resume event thread)\n", | |
1292 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1293 | target_pid_to_str (ptid), | |
1294 | signo ? strsignal (signo) : "0"); | |
1295 | } | |
1296 | ||
1297 | /* Issue kill to specified lwp. */ | |
1298 | ||
1299 | static int tkill_failed; | |
1300 | ||
1301 | static int | |
1302 | kill_lwp (int lwpid, int signo) | |
1303 | { | |
1304 | errno = 0; | |
1305 | ||
1306 | /* Use tkill, if possible, in case we are using nptl threads. If tkill | |
1307 | fails, then we are not using nptl threads and we should be using kill. */ | |
1308 | ||
1309 | #ifdef HAVE_TKILL_SYSCALL | |
1310 | if (!tkill_failed) | |
1311 | { | |
1312 | int ret = syscall (__NR_tkill, lwpid, signo); | |
1313 | if (errno != ENOSYS) | |
1314 | return ret; | |
1315 | errno = 0; | |
1316 | tkill_failed = 1; | |
1317 | } | |
1318 | #endif | |
1319 | ||
1320 | return kill (lwpid, signo); | |
1321 | } | |
1322 | ||
1323 | /* Handle a GNU/Linux extended wait response. Most of the work we | |
1324 | just pass off to linux_handle_extended_wait, but if it reports a | |
1325 | clone event we need to add the new LWP to our list (and not report | |
1326 | the trap to higher layers). This function returns non-zero if | |
1327 | the event should be ignored and we should wait again. */ | |
1328 | ||
1329 | static int | |
1330 | linux_nat_handle_extended (struct lwp_info *lp, int status) | |
1331 | { | |
1332 | linux_handle_extended_wait (GET_LWP (lp->ptid), status, | |
1333 | &lp->waitstatus); | |
1334 | ||
1335 | /* TARGET_WAITKIND_SPURIOUS is used to indicate clone events. */ | |
1336 | if (lp->waitstatus.kind == TARGET_WAITKIND_SPURIOUS) | |
1337 | { | |
1338 | struct lwp_info *new_lp; | |
1339 | new_lp = add_lwp (BUILD_LWP (lp->waitstatus.value.related_pid, | |
1340 | GET_PID (inferior_ptid))); | |
1341 | new_lp->cloned = 1; | |
1342 | new_lp->stopped = 1; | |
1343 | ||
1344 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1345 | ||
1346 | if (debug_linux_nat) | |
1347 | fprintf_unfiltered (gdb_stdlog, | |
1348 | "LLHE: Got clone event from LWP %ld, resuming\n", | |
1349 | GET_LWP (lp->ptid)); | |
1350 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1351 | ||
1352 | return 1; | |
1353 | } | |
1354 | ||
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
1359 | exited. */ | |
1360 | ||
1361 | static int | |
1362 | wait_lwp (struct lwp_info *lp) | |
1363 | { | |
1364 | pid_t pid; | |
1365 | int status; | |
1366 | int thread_dead = 0; | |
1367 | ||
1368 | gdb_assert (!lp->stopped); | |
1369 | gdb_assert (lp->status == 0); | |
1370 | ||
58aecb61 | 1371 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
1372 | if (pid == -1 && errno == ECHILD) |
1373 | { | |
58aecb61 | 1374 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
1375 | if (pid == -1 && errno == ECHILD) |
1376 | { | |
1377 | /* The thread has previously exited. We need to delete it | |
1378 | now because, for some vendor 2.4 kernels with NPTL | |
1379 | support backported, there won't be an exit event unless | |
1380 | it is the main thread. 2.6 kernels will report an exit | |
1381 | event for each thread that exits, as expected. */ | |
1382 | thread_dead = 1; | |
1383 | if (debug_linux_nat) | |
1384 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
1385 | target_pid_to_str (lp->ptid)); | |
1386 | } | |
1387 | } | |
1388 | ||
1389 | if (!thread_dead) | |
1390 | { | |
1391 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
1392 | ||
1393 | if (debug_linux_nat) | |
1394 | { | |
1395 | fprintf_unfiltered (gdb_stdlog, | |
1396 | "WL: waitpid %s received %s\n", | |
1397 | target_pid_to_str (lp->ptid), | |
1398 | status_to_str (status)); | |
1399 | } | |
1400 | } | |
1401 | ||
1402 | /* Check if the thread has exited. */ | |
1403 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
1404 | { | |
1405 | thread_dead = 1; | |
1406 | if (debug_linux_nat) | |
1407 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
1408 | target_pid_to_str (lp->ptid)); | |
1409 | } | |
1410 | ||
1411 | if (thread_dead) | |
1412 | { | |
e26af52f | 1413 | exit_lwp (lp); |
d6b0e80f AC |
1414 | return 0; |
1415 | } | |
1416 | ||
1417 | gdb_assert (WIFSTOPPED (status)); | |
1418 | ||
1419 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
1420 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1421 | { | |
1422 | if (debug_linux_nat) | |
1423 | fprintf_unfiltered (gdb_stdlog, | |
1424 | "WL: Handling extended status 0x%06x\n", | |
1425 | status); | |
1426 | if (linux_nat_handle_extended (lp, status)) | |
1427 | return wait_lwp (lp); | |
1428 | } | |
1429 | ||
1430 | return status; | |
1431 | } | |
1432 | ||
1433 | /* Send a SIGSTOP to LP. */ | |
1434 | ||
1435 | static int | |
1436 | stop_callback (struct lwp_info *lp, void *data) | |
1437 | { | |
1438 | if (!lp->stopped && !lp->signalled) | |
1439 | { | |
1440 | int ret; | |
1441 | ||
1442 | if (debug_linux_nat) | |
1443 | { | |
1444 | fprintf_unfiltered (gdb_stdlog, | |
1445 | "SC: kill %s **<SIGSTOP>**\n", | |
1446 | target_pid_to_str (lp->ptid)); | |
1447 | } | |
1448 | errno = 0; | |
1449 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
1450 | if (debug_linux_nat) | |
1451 | { | |
1452 | fprintf_unfiltered (gdb_stdlog, | |
1453 | "SC: lwp kill %d %s\n", | |
1454 | ret, | |
1455 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
1456 | } | |
1457 | ||
1458 | lp->signalled = 1; | |
1459 | gdb_assert (lp->status == 0); | |
1460 | } | |
1461 | ||
1462 | return 0; | |
1463 | } | |
1464 | ||
1465 | /* Wait until LP is stopped. If DATA is non-null it is interpreted as | |
1466 | a pointer to a set of signals to be flushed immediately. */ | |
1467 | ||
1468 | static int | |
1469 | stop_wait_callback (struct lwp_info *lp, void *data) | |
1470 | { | |
1471 | sigset_t *flush_mask = data; | |
1472 | ||
1473 | if (!lp->stopped) | |
1474 | { | |
1475 | int status; | |
1476 | ||
1477 | status = wait_lwp (lp); | |
1478 | if (status == 0) | |
1479 | return 0; | |
1480 | ||
1481 | /* Ignore any signals in FLUSH_MASK. */ | |
1482 | if (flush_mask && sigismember (flush_mask, WSTOPSIG (status))) | |
1483 | { | |
1484 | if (!lp->signalled) | |
1485 | { | |
1486 | lp->stopped = 1; | |
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | errno = 0; | |
1491 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1492 | if (debug_linux_nat) | |
1493 | fprintf_unfiltered (gdb_stdlog, | |
1494 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
1495 | target_pid_to_str (lp->ptid), | |
1496 | errno ? safe_strerror (errno) : "OK"); | |
1497 | ||
1498 | return stop_wait_callback (lp, flush_mask); | |
1499 | } | |
1500 | ||
1501 | if (WSTOPSIG (status) != SIGSTOP) | |
1502 | { | |
1503 | if (WSTOPSIG (status) == SIGTRAP) | |
1504 | { | |
1505 | /* If a LWP other than the LWP that we're reporting an | |
1506 | event for has hit a GDB breakpoint (as opposed to | |
1507 | some random trap signal), then just arrange for it to | |
1508 | hit it again later. We don't keep the SIGTRAP status | |
1509 | and don't forward the SIGTRAP signal to the LWP. We | |
1510 | will handle the current event, eventually we will | |
1511 | resume all LWPs, and this one will get its breakpoint | |
1512 | trap again. | |
1513 | ||
1514 | If we do not do this, then we run the risk that the | |
1515 | user will delete or disable the breakpoint, but the | |
1516 | thread will have already tripped on it. */ | |
1517 | ||
1518 | /* Now resume this LWP and get the SIGSTOP event. */ | |
1519 | errno = 0; | |
1520 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1521 | if (debug_linux_nat) | |
1522 | { | |
1523 | fprintf_unfiltered (gdb_stdlog, | |
1524 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
1525 | target_pid_to_str (lp->ptid), | |
1526 | errno ? safe_strerror (errno) : "OK"); | |
1527 | ||
1528 | fprintf_unfiltered (gdb_stdlog, | |
1529 | "SWC: Candidate SIGTRAP event in %s\n", | |
1530 | target_pid_to_str (lp->ptid)); | |
1531 | } | |
1532 | /* Hold the SIGTRAP for handling by linux_nat_wait. */ | |
1533 | stop_wait_callback (lp, data); | |
1534 | /* If there's another event, throw it back into the queue. */ | |
1535 | if (lp->status) | |
1536 | { | |
1537 | if (debug_linux_nat) | |
1538 | { | |
1539 | fprintf_unfiltered (gdb_stdlog, | |
1540 | "SWC: kill %s, %s\n", | |
1541 | target_pid_to_str (lp->ptid), | |
1542 | status_to_str ((int) status)); | |
1543 | } | |
1544 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
1545 | } | |
1546 | /* Save the sigtrap event. */ | |
1547 | lp->status = status; | |
1548 | return 0; | |
1549 | } | |
1550 | else | |
1551 | { | |
1552 | /* The thread was stopped with a signal other than | |
1553 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
1554 | ||
1555 | if (debug_linux_nat) | |
1556 | { | |
1557 | fprintf_unfiltered (gdb_stdlog, | |
1558 | "SWC: Pending event %s in %s\n", | |
1559 | status_to_str ((int) status), | |
1560 | target_pid_to_str (lp->ptid)); | |
1561 | } | |
1562 | /* Now resume this LWP and get the SIGSTOP event. */ | |
1563 | errno = 0; | |
1564 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1565 | if (debug_linux_nat) | |
1566 | fprintf_unfiltered (gdb_stdlog, | |
1567 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
1568 | target_pid_to_str (lp->ptid), | |
1569 | errno ? safe_strerror (errno) : "OK"); | |
1570 | ||
1571 | /* Hold this event/waitstatus while we check to see if | |
1572 | there are any more (we still want to get that SIGSTOP). */ | |
1573 | stop_wait_callback (lp, data); | |
1574 | /* If the lp->status field is still empty, use it to hold | |
1575 | this event. If not, then this event must be returned | |
1576 | to the event queue of the LWP. */ | |
1577 | if (lp->status == 0) | |
1578 | lp->status = status; | |
1579 | else | |
1580 | { | |
1581 | if (debug_linux_nat) | |
1582 | { | |
1583 | fprintf_unfiltered (gdb_stdlog, | |
1584 | "SWC: kill %s, %s\n", | |
1585 | target_pid_to_str (lp->ptid), | |
1586 | status_to_str ((int) status)); | |
1587 | } | |
1588 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
1589 | } | |
1590 | return 0; | |
1591 | } | |
1592 | } | |
1593 | else | |
1594 | { | |
1595 | /* We caught the SIGSTOP that we intended to catch, so | |
1596 | there's no SIGSTOP pending. */ | |
1597 | lp->stopped = 1; | |
1598 | lp->signalled = 0; | |
1599 | } | |
1600 | } | |
1601 | ||
1602 | return 0; | |
1603 | } | |
1604 | ||
1605 | /* Check whether PID has any pending signals in FLUSH_MASK. If so set | |
1606 | the appropriate bits in PENDING, and return 1 - otherwise return 0. */ | |
1607 | ||
1608 | static int | |
1609 | linux_nat_has_pending (int pid, sigset_t *pending, sigset_t *flush_mask) | |
1610 | { | |
1611 | sigset_t blocked, ignored; | |
1612 | int i; | |
1613 | ||
1614 | linux_proc_pending_signals (pid, pending, &blocked, &ignored); | |
1615 | ||
1616 | if (!flush_mask) | |
1617 | return 0; | |
1618 | ||
1619 | for (i = 1; i < NSIG; i++) | |
1620 | if (sigismember (pending, i)) | |
1621 | if (!sigismember (flush_mask, i) | |
1622 | || sigismember (&blocked, i) | |
1623 | || sigismember (&ignored, i)) | |
1624 | sigdelset (pending, i); | |
1625 | ||
1626 | if (sigisemptyset (pending)) | |
1627 | return 0; | |
1628 | ||
1629 | return 1; | |
1630 | } | |
1631 | ||
1632 | /* DATA is interpreted as a mask of signals to flush. If LP has | |
1633 | signals pending, and they are all in the flush mask, then arrange | |
1634 | to flush them. LP should be stopped, as should all other threads | |
1635 | it might share a signal queue with. */ | |
1636 | ||
1637 | static int | |
1638 | flush_callback (struct lwp_info *lp, void *data) | |
1639 | { | |
1640 | sigset_t *flush_mask = data; | |
1641 | sigset_t pending, intersection, blocked, ignored; | |
1642 | int pid, status; | |
1643 | ||
1644 | /* Normally, when an LWP exits, it is removed from the LWP list. The | |
1645 | last LWP isn't removed till later, however. So if there is only | |
1646 | one LWP on the list, make sure it's alive. */ | |
1647 | if (lwp_list == lp && lp->next == NULL) | |
1648 | if (!linux_nat_thread_alive (lp->ptid)) | |
1649 | return 0; | |
1650 | ||
1651 | /* Just because the LWP is stopped doesn't mean that new signals | |
1652 | can't arrive from outside, so this function must be careful of | |
1653 | race conditions. However, because all threads are stopped, we | |
1654 | can assume that the pending mask will not shrink unless we resume | |
1655 | the LWP, and that it will then get another signal. We can't | |
1656 | control which one, however. */ | |
1657 | ||
1658 | if (lp->status) | |
1659 | { | |
1660 | if (debug_linux_nat) | |
a3f17187 | 1661 | printf_unfiltered (_("FC: LP has pending status %06x\n"), lp->status); |
d6b0e80f AC |
1662 | if (WIFSTOPPED (lp->status) && sigismember (flush_mask, WSTOPSIG (lp->status))) |
1663 | lp->status = 0; | |
1664 | } | |
1665 | ||
1666 | while (linux_nat_has_pending (GET_LWP (lp->ptid), &pending, flush_mask)) | |
1667 | { | |
1668 | int ret; | |
1669 | ||
1670 | errno = 0; | |
1671 | ret = ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1672 | if (debug_linux_nat) | |
1673 | fprintf_unfiltered (gdb_stderr, | |
1674 | "FC: Sent PTRACE_CONT, ret %d %d\n", ret, errno); | |
1675 | ||
1676 | lp->stopped = 0; | |
1677 | stop_wait_callback (lp, flush_mask); | |
1678 | if (debug_linux_nat) | |
1679 | fprintf_unfiltered (gdb_stderr, | |
1680 | "FC: Wait finished; saved status is %d\n", | |
1681 | lp->status); | |
1682 | } | |
1683 | ||
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | /* Return non-zero if LP has a wait status pending. */ | |
1688 | ||
1689 | static int | |
1690 | status_callback (struct lwp_info *lp, void *data) | |
1691 | { | |
1692 | /* Only report a pending wait status if we pretend that this has | |
1693 | indeed been resumed. */ | |
1694 | return (lp->status != 0 && lp->resumed); | |
1695 | } | |
1696 | ||
1697 | /* Return non-zero if LP isn't stopped. */ | |
1698 | ||
1699 | static int | |
1700 | running_callback (struct lwp_info *lp, void *data) | |
1701 | { | |
1702 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
1703 | } | |
1704 | ||
1705 | /* Count the LWP's that have had events. */ | |
1706 | ||
1707 | static int | |
1708 | count_events_callback (struct lwp_info *lp, void *data) | |
1709 | { | |
1710 | int *count = data; | |
1711 | ||
1712 | gdb_assert (count != NULL); | |
1713 | ||
1714 | /* Count only LWPs that have a SIGTRAP event pending. */ | |
1715 | if (lp->status != 0 | |
1716 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) | |
1717 | (*count)++; | |
1718 | ||
1719 | return 0; | |
1720 | } | |
1721 | ||
1722 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1723 | ||
1724 | static int | |
1725 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
1726 | { | |
1727 | if (lp->step && lp->status != 0) | |
1728 | return 1; | |
1729 | else | |
1730 | return 0; | |
1731 | } | |
1732 | ||
1733 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
1734 | ||
1735 | static int | |
1736 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
1737 | { | |
1738 | int *selector = data; | |
1739 | ||
1740 | gdb_assert (selector != NULL); | |
1741 | ||
1742 | /* Select only LWPs that have a SIGTRAP event pending. */ | |
1743 | if (lp->status != 0 | |
1744 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) | |
1745 | if ((*selector)-- == 0) | |
1746 | return 1; | |
1747 | ||
1748 | return 0; | |
1749 | } | |
1750 | ||
1751 | static int | |
1752 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
1753 | { | |
1754 | struct lwp_info *event_lp = data; | |
1755 | ||
1756 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1757 | if (lp == event_lp) | |
1758 | return 0; | |
1759 | ||
1760 | /* If a LWP other than the LWP that we're reporting an event for has | |
1761 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1762 | then just arrange for it to hit it again later. We don't keep | |
1763 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1764 | LWP. We will handle the current event, eventually we will resume | |
1765 | all LWPs, and this one will get its breakpoint trap again. | |
1766 | ||
1767 | If we do not do this, then we run the risk that the user will | |
1768 | delete or disable the breakpoint, but the LWP will have already | |
1769 | tripped on it. */ | |
1770 | ||
1771 | if (lp->status != 0 | |
1772 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP | |
1773 | && breakpoint_inserted_here_p (read_pc_pid (lp->ptid) - | |
1774 | DECR_PC_AFTER_BREAK)) | |
1775 | { | |
1776 | if (debug_linux_nat) | |
1777 | fprintf_unfiltered (gdb_stdlog, | |
1778 | "CBC: Push back breakpoint for %s\n", | |
1779 | target_pid_to_str (lp->ptid)); | |
1780 | ||
1781 | /* Back up the PC if necessary. */ | |
1782 | if (DECR_PC_AFTER_BREAK) | |
1783 | write_pc_pid (read_pc_pid (lp->ptid) - DECR_PC_AFTER_BREAK, lp->ptid); | |
1784 | ||
1785 | /* Throw away the SIGTRAP. */ | |
1786 | lp->status = 0; | |
1787 | } | |
1788 | ||
1789 | return 0; | |
1790 | } | |
1791 | ||
1792 | /* Select one LWP out of those that have events pending. */ | |
1793 | ||
1794 | static void | |
1795 | select_event_lwp (struct lwp_info **orig_lp, int *status) | |
1796 | { | |
1797 | int num_events = 0; | |
1798 | int random_selector; | |
1799 | struct lwp_info *event_lp; | |
1800 | ||
ac264b3b | 1801 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
1802 | (*orig_lp)->status = *status; |
1803 | ||
1804 | /* Give preference to any LWP that is being single-stepped. */ | |
1805 | event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL); | |
1806 | if (event_lp != NULL) | |
1807 | { | |
1808 | if (debug_linux_nat) | |
1809 | fprintf_unfiltered (gdb_stdlog, | |
1810 | "SEL: Select single-step %s\n", | |
1811 | target_pid_to_str (event_lp->ptid)); | |
1812 | } | |
1813 | else | |
1814 | { | |
1815 | /* No single-stepping LWP. Select one at random, out of those | |
1816 | which have had SIGTRAP events. */ | |
1817 | ||
1818 | /* First see how many SIGTRAP events we have. */ | |
1819 | iterate_over_lwps (count_events_callback, &num_events); | |
1820 | ||
1821 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1822 | random_selector = (int) | |
1823 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1824 | ||
1825 | if (debug_linux_nat && num_events > 1) | |
1826 | fprintf_unfiltered (gdb_stdlog, | |
1827 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1828 | num_events, random_selector); | |
1829 | ||
1830 | event_lp = iterate_over_lwps (select_event_lwp_callback, | |
1831 | &random_selector); | |
1832 | } | |
1833 | ||
1834 | if (event_lp != NULL) | |
1835 | { | |
1836 | /* Switch the event LWP. */ | |
1837 | *orig_lp = event_lp; | |
1838 | *status = event_lp->status; | |
1839 | } | |
1840 | ||
1841 | /* Flush the wait status for the event LWP. */ | |
1842 | (*orig_lp)->status = 0; | |
1843 | } | |
1844 | ||
1845 | /* Return non-zero if LP has been resumed. */ | |
1846 | ||
1847 | static int | |
1848 | resumed_callback (struct lwp_info *lp, void *data) | |
1849 | { | |
1850 | return lp->resumed; | |
1851 | } | |
1852 | ||
ac264b3b MS |
1853 | /* Local mourn_inferior -- we need to override mourn_inferior |
1854 | so that we can do something clever if one of several forks | |
1855 | has exited. */ | |
1856 | ||
1857 | static void | |
1858 | child_mourn_inferior (void) | |
1859 | { | |
1860 | int status; | |
1861 | ||
1862 | if (! forks_exist_p ()) | |
1863 | { | |
1864 | /* Normal case, no other forks available. */ | |
1865 | super_mourn_inferior (); | |
1866 | return; | |
1867 | } | |
1868 | else | |
1869 | { | |
1870 | /* Multi-fork case. The current inferior_ptid has exited, but | |
1871 | there are other viable forks to debug. Delete the exiting | |
1872 | one and context-switch to the first available. */ | |
1873 | linux_fork_mourn_inferior (); | |
1874 | } | |
1875 | } | |
1876 | ||
d6b0e80f AC |
1877 | /* We need to override child_wait to support attaching to cloned |
1878 | processes, since a normal wait (as done by the default version) | |
1879 | ignores those processes. */ | |
1880 | ||
1881 | /* Wait for child PTID to do something. Return id of the child, | |
1882 | minus_one_ptid in case of error; store status into *OURSTATUS. */ | |
1883 | ||
1884 | ptid_t | |
1885 | child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
1886 | { | |
1887 | int save_errno; | |
1888 | int status; | |
1889 | pid_t pid; | |
1890 | ||
1891 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1892 | ||
1893 | do | |
1894 | { | |
1895 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
1896 | attached process. */ | |
1897 | set_sigio_trap (); | |
1898 | ||
58aecb61 | 1899 | pid = my_waitpid (GET_PID (ptid), &status, 0); |
d6b0e80f AC |
1900 | if (pid == -1 && errno == ECHILD) |
1901 | /* Try again with __WCLONE to check cloned processes. */ | |
58aecb61 | 1902 | pid = my_waitpid (GET_PID (ptid), &status, __WCLONE); |
d6b0e80f AC |
1903 | |
1904 | if (debug_linux_nat) | |
1905 | { | |
1906 | fprintf_unfiltered (gdb_stdlog, | |
1907 | "CW: waitpid %ld received %s\n", | |
1908 | (long) pid, status_to_str (status)); | |
1909 | } | |
1910 | ||
1911 | save_errno = errno; | |
1912 | ||
1913 | /* Make sure we don't report an event for the exit of the | |
1914 | original program, if we've detached from it. */ | |
1915 | if (pid != -1 && !WIFSTOPPED (status) && pid != GET_PID (inferior_ptid)) | |
1916 | { | |
1917 | pid = -1; | |
1918 | save_errno = EINTR; | |
1919 | } | |
1920 | ||
1921 | /* Check for stop events reported by a process we didn't already | |
1922 | know about - in this case, anything other than inferior_ptid. | |
1923 | ||
1924 | If we're expecting to receive stopped processes after fork, | |
1925 | vfork, and clone events, then we'll just add the new one to | |
1926 | our list and go back to waiting for the event to be reported | |
1927 | - the stopped process might be returned from waitpid before | |
1928 | or after the event is. If we want to handle debugging of | |
1929 | CLONE_PTRACE processes we need to do more here, i.e. switch | |
1930 | to multi-threaded mode. */ | |
1931 | if (pid != -1 && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP | |
1932 | && pid != GET_PID (inferior_ptid)) | |
1933 | { | |
1934 | linux_record_stopped_pid (pid); | |
1935 | pid = -1; | |
1936 | save_errno = EINTR; | |
1937 | } | |
1938 | ||
1939 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
1940 | if (pid != -1 && WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP | |
1941 | && status >> 16 != 0) | |
1942 | { | |
1943 | linux_handle_extended_wait (pid, status, ourstatus); | |
1944 | ||
1945 | /* If we see a clone event, detach the child, and don't | |
1946 | report the event. It would be nice to offer some way to | |
1947 | switch into a non-thread-db based threaded mode at this | |
1948 | point. */ | |
1949 | if (ourstatus->kind == TARGET_WAITKIND_SPURIOUS) | |
1950 | { | |
1951 | ptrace (PTRACE_DETACH, ourstatus->value.related_pid, 0, 0); | |
1952 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1953 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1954 | pid = -1; | |
1955 | save_errno = EINTR; | |
1956 | } | |
1957 | } | |
1958 | ||
1959 | clear_sigio_trap (); | |
1960 | clear_sigint_trap (); | |
1961 | } | |
1962 | while (pid == -1 && save_errno == EINTR); | |
1963 | ||
1964 | if (pid == -1) | |
1965 | { | |
8a3fe4f8 | 1966 | warning (_("Child process unexpectedly missing: %s"), |
d6b0e80f AC |
1967 | safe_strerror (errno)); |
1968 | ||
1969 | /* Claim it exited with unknown signal. */ | |
1970 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1971 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
1972 | return minus_one_ptid; | |
1973 | } | |
1974 | ||
1975 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) | |
1976 | store_waitstatus (ourstatus, status); | |
1977 | ||
1978 | return pid_to_ptid (pid); | |
1979 | } | |
1980 | ||
d6b0e80f AC |
1981 | /* Stop an active thread, verify it still exists, then resume it. */ |
1982 | ||
1983 | static int | |
1984 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
1985 | { | |
1986 | struct lwp_info *ptr; | |
1987 | ||
1988 | if (!lp->stopped && !lp->signalled) | |
1989 | { | |
1990 | stop_callback (lp, NULL); | |
1991 | stop_wait_callback (lp, NULL); | |
1992 | /* Resume if the lwp still exists. */ | |
1993 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
1994 | if (lp == ptr) | |
1995 | { | |
1996 | resume_callback (lp, NULL); | |
1997 | resume_set_callback (lp, NULL); | |
1998 | } | |
1999 | } | |
2000 | return 0; | |
2001 | } | |
2002 | ||
2003 | static ptid_t | |
2004 | linux_nat_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
2005 | { | |
2006 | struct lwp_info *lp = NULL; | |
2007 | int options = 0; | |
2008 | int status = 0; | |
2009 | pid_t pid = PIDGET (ptid); | |
2010 | sigset_t flush_mask; | |
2011 | ||
2012 | sigemptyset (&flush_mask); | |
2013 | ||
2014 | /* Make sure SIGCHLD is blocked. */ | |
2015 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
2016 | { | |
2017 | sigaddset (&blocked_mask, SIGCHLD); | |
2018 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
2019 | } | |
2020 | ||
2021 | retry: | |
2022 | ||
2023 | /* Make sure there is at least one LWP that has been resumed, at | |
2024 | least if there are any LWPs at all. */ | |
2025 | gdb_assert (num_lwps == 0 || iterate_over_lwps (resumed_callback, NULL)); | |
2026 | ||
2027 | /* First check if there is a LWP with a wait status pending. */ | |
2028 | if (pid == -1) | |
2029 | { | |
2030 | /* Any LWP that's been resumed will do. */ | |
2031 | lp = iterate_over_lwps (status_callback, NULL); | |
2032 | if (lp) | |
2033 | { | |
2034 | status = lp->status; | |
2035 | lp->status = 0; | |
2036 | ||
2037 | if (debug_linux_nat && status) | |
2038 | fprintf_unfiltered (gdb_stdlog, | |
2039 | "LLW: Using pending wait status %s for %s.\n", | |
2040 | status_to_str (status), | |
2041 | target_pid_to_str (lp->ptid)); | |
2042 | } | |
2043 | ||
2044 | /* But if we don't fine one, we'll have to wait, and check both | |
2045 | cloned and uncloned processes. We start with the cloned | |
2046 | processes. */ | |
2047 | options = __WCLONE | WNOHANG; | |
2048 | } | |
2049 | else if (is_lwp (ptid)) | |
2050 | { | |
2051 | if (debug_linux_nat) | |
2052 | fprintf_unfiltered (gdb_stdlog, | |
2053 | "LLW: Waiting for specific LWP %s.\n", | |
2054 | target_pid_to_str (ptid)); | |
2055 | ||
2056 | /* We have a specific LWP to check. */ | |
2057 | lp = find_lwp_pid (ptid); | |
2058 | gdb_assert (lp); | |
2059 | status = lp->status; | |
2060 | lp->status = 0; | |
2061 | ||
2062 | if (debug_linux_nat && status) | |
2063 | fprintf_unfiltered (gdb_stdlog, | |
2064 | "LLW: Using pending wait status %s for %s.\n", | |
2065 | status_to_str (status), | |
2066 | target_pid_to_str (lp->ptid)); | |
2067 | ||
2068 | /* If we have to wait, take into account whether PID is a cloned | |
2069 | process or not. And we have to convert it to something that | |
2070 | the layer beneath us can understand. */ | |
2071 | options = lp->cloned ? __WCLONE : 0; | |
2072 | pid = GET_LWP (ptid); | |
2073 | } | |
2074 | ||
2075 | if (status && lp->signalled) | |
2076 | { | |
2077 | /* A pending SIGSTOP may interfere with the normal stream of | |
2078 | events. In a typical case where interference is a problem, | |
2079 | we have a SIGSTOP signal pending for LWP A while | |
2080 | single-stepping it, encounter an event in LWP B, and take the | |
2081 | pending SIGSTOP while trying to stop LWP A. After processing | |
2082 | the event in LWP B, LWP A is continued, and we'll never see | |
2083 | the SIGTRAP associated with the last time we were | |
2084 | single-stepping LWP A. */ | |
2085 | ||
2086 | /* Resume the thread. It should halt immediately returning the | |
2087 | pending SIGSTOP. */ | |
2088 | registers_changed (); | |
10d6c8cd DJ |
2089 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
2090 | lp->step, TARGET_SIGNAL_0); | |
d6b0e80f AC |
2091 | if (debug_linux_nat) |
2092 | fprintf_unfiltered (gdb_stdlog, | |
2093 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
2094 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2095 | target_pid_to_str (lp->ptid)); | |
2096 | lp->stopped = 0; | |
2097 | gdb_assert (lp->resumed); | |
2098 | ||
2099 | /* This should catch the pending SIGSTOP. */ | |
2100 | stop_wait_callback (lp, NULL); | |
2101 | } | |
2102 | ||
2103 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
2104 | attached process. */ | |
2105 | set_sigio_trap (); | |
2106 | ||
2107 | while (status == 0) | |
2108 | { | |
2109 | pid_t lwpid; | |
2110 | ||
58aecb61 | 2111 | lwpid = my_waitpid (pid, &status, options); |
d6b0e80f AC |
2112 | if (lwpid > 0) |
2113 | { | |
2114 | gdb_assert (pid == -1 || lwpid == pid); | |
2115 | ||
2116 | if (debug_linux_nat) | |
2117 | { | |
2118 | fprintf_unfiltered (gdb_stdlog, | |
2119 | "LLW: waitpid %ld received %s\n", | |
2120 | (long) lwpid, status_to_str (status)); | |
2121 | } | |
2122 | ||
2123 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2124 | ||
2125 | /* Check for stop events reported by a process we didn't | |
2126 | already know about - anything not already in our LWP | |
2127 | list. | |
2128 | ||
2129 | If we're expecting to receive stopped processes after | |
2130 | fork, vfork, and clone events, then we'll just add the | |
2131 | new one to our list and go back to waiting for the event | |
2132 | to be reported - the stopped process might be returned | |
2133 | from waitpid before or after the event is. */ | |
2134 | if (WIFSTOPPED (status) && !lp) | |
2135 | { | |
2136 | linux_record_stopped_pid (lwpid); | |
2137 | status = 0; | |
2138 | continue; | |
2139 | } | |
2140 | ||
2141 | /* Make sure we don't report an event for the exit of an LWP not in | |
2142 | our list, i.e. not part of the current process. This can happen | |
2143 | if we detach from a program we original forked and then it | |
2144 | exits. */ | |
2145 | if (!WIFSTOPPED (status) && !lp) | |
2146 | { | |
2147 | status = 0; | |
2148 | continue; | |
2149 | } | |
2150 | ||
2151 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
2152 | CLONE_PTRACE processes which do not use the thread library - | |
2153 | otherwise we wouldn't find the new LWP this way. That doesn't | |
2154 | currently work, and the following code is currently unreachable | |
2155 | due to the two blocks above. If it's fixed some day, this code | |
2156 | should be broken out into a function so that we can also pick up | |
2157 | LWPs from the new interface. */ | |
2158 | if (!lp) | |
2159 | { | |
2160 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
2161 | if (options & __WCLONE) | |
2162 | lp->cloned = 1; | |
2163 | ||
2164 | if (threaded) | |
2165 | { | |
2166 | gdb_assert (WIFSTOPPED (status) | |
2167 | && WSTOPSIG (status) == SIGSTOP); | |
2168 | lp->signalled = 1; | |
2169 | ||
2170 | if (!in_thread_list (inferior_ptid)) | |
2171 | { | |
2172 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
2173 | GET_PID (inferior_ptid)); | |
2174 | add_thread (inferior_ptid); | |
2175 | } | |
2176 | ||
2177 | add_thread (lp->ptid); | |
a3f17187 | 2178 | printf_unfiltered (_("[New %s]\n"), |
d6b0e80f AC |
2179 | target_pid_to_str (lp->ptid)); |
2180 | } | |
2181 | } | |
2182 | ||
2183 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
2184 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2185 | { | |
2186 | if (debug_linux_nat) | |
2187 | fprintf_unfiltered (gdb_stdlog, | |
2188 | "LLW: Handling extended status 0x%06x\n", | |
2189 | status); | |
2190 | if (linux_nat_handle_extended (lp, status)) | |
2191 | { | |
2192 | status = 0; | |
2193 | continue; | |
2194 | } | |
2195 | } | |
2196 | ||
2197 | /* Check if the thread has exited. */ | |
2198 | if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1) | |
2199 | { | |
d6b0e80f AC |
2200 | /* If this is the main thread, we must stop all threads and |
2201 | verify if they are still alive. This is because in the nptl | |
2202 | thread model, there is no signal issued for exiting LWPs | |
2203 | other than the main thread. We only get the main thread | |
2204 | exit signal once all child threads have already exited. | |
2205 | If we stop all the threads and use the stop_wait_callback | |
2206 | to check if they have exited we can determine whether this | |
2207 | signal should be ignored or whether it means the end of the | |
2208 | debugged application, regardless of which threading model | |
2209 | is being used. */ | |
2210 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) | |
2211 | { | |
2212 | lp->stopped = 1; | |
2213 | iterate_over_lwps (stop_and_resume_callback, NULL); | |
2214 | } | |
2215 | ||
2216 | if (debug_linux_nat) | |
2217 | fprintf_unfiltered (gdb_stdlog, | |
2218 | "LLW: %s exited.\n", | |
2219 | target_pid_to_str (lp->ptid)); | |
2220 | ||
e26af52f | 2221 | exit_lwp (lp); |
d6b0e80f AC |
2222 | |
2223 | /* If there is at least one more LWP, then the exit signal | |
2224 | was not the end of the debugged application and should be | |
2225 | ignored. */ | |
2226 | if (num_lwps > 0) | |
2227 | { | |
2228 | /* Make sure there is at least one thread running. */ | |
2229 | gdb_assert (iterate_over_lwps (running_callback, NULL)); | |
2230 | ||
2231 | /* Discard the event. */ | |
2232 | status = 0; | |
2233 | continue; | |
2234 | } | |
2235 | } | |
2236 | ||
2237 | /* Check if the current LWP has previously exited. In the nptl | |
2238 | thread model, LWPs other than the main thread do not issue | |
2239 | signals when they exit so we must check whenever the thread | |
2240 | has stopped. A similar check is made in stop_wait_callback(). */ | |
2241 | if (num_lwps > 1 && !linux_nat_thread_alive (lp->ptid)) | |
2242 | { | |
d6b0e80f AC |
2243 | if (debug_linux_nat) |
2244 | fprintf_unfiltered (gdb_stdlog, | |
2245 | "LLW: %s exited.\n", | |
2246 | target_pid_to_str (lp->ptid)); | |
2247 | ||
e26af52f | 2248 | exit_lwp (lp); |
d6b0e80f AC |
2249 | |
2250 | /* Make sure there is at least one thread running. */ | |
2251 | gdb_assert (iterate_over_lwps (running_callback, NULL)); | |
2252 | ||
2253 | /* Discard the event. */ | |
2254 | status = 0; | |
2255 | continue; | |
2256 | } | |
2257 | ||
2258 | /* Make sure we don't report a SIGSTOP that we sent | |
2259 | ourselves in an attempt to stop an LWP. */ | |
2260 | if (lp->signalled | |
2261 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
2262 | { | |
2263 | if (debug_linux_nat) | |
2264 | fprintf_unfiltered (gdb_stdlog, | |
2265 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
2266 | target_pid_to_str (lp->ptid)); | |
2267 | ||
2268 | /* This is a delayed SIGSTOP. */ | |
2269 | lp->signalled = 0; | |
2270 | ||
2271 | registers_changed (); | |
10d6c8cd DJ |
2272 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
2273 | lp->step, TARGET_SIGNAL_0); | |
d6b0e80f AC |
2274 | if (debug_linux_nat) |
2275 | fprintf_unfiltered (gdb_stdlog, | |
2276 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
2277 | lp->step ? | |
2278 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2279 | target_pid_to_str (lp->ptid)); | |
2280 | ||
2281 | lp->stopped = 0; | |
2282 | gdb_assert (lp->resumed); | |
2283 | ||
2284 | /* Discard the event. */ | |
2285 | status = 0; | |
2286 | continue; | |
2287 | } | |
2288 | ||
2289 | break; | |
2290 | } | |
2291 | ||
2292 | if (pid == -1) | |
2293 | { | |
2294 | /* Alternate between checking cloned and uncloned processes. */ | |
2295 | options ^= __WCLONE; | |
2296 | ||
2297 | /* And suspend every time we have checked both. */ | |
2298 | if (options & __WCLONE) | |
2299 | sigsuspend (&suspend_mask); | |
2300 | } | |
2301 | ||
2302 | /* We shouldn't end up here unless we want to try again. */ | |
2303 | gdb_assert (status == 0); | |
2304 | } | |
2305 | ||
2306 | clear_sigio_trap (); | |
2307 | clear_sigint_trap (); | |
2308 | ||
2309 | gdb_assert (lp); | |
2310 | ||
2311 | /* Don't report signals that GDB isn't interested in, such as | |
2312 | signals that are neither printed nor stopped upon. Stopping all | |
2313 | threads can be a bit time-consuming so if we want decent | |
2314 | performance with heavily multi-threaded programs, especially when | |
2315 | they're using a high frequency timer, we'd better avoid it if we | |
2316 | can. */ | |
2317 | ||
2318 | if (WIFSTOPPED (status)) | |
2319 | { | |
2320 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
2321 | ||
2322 | if (signal_stop_state (signo) == 0 | |
2323 | && signal_print_state (signo) == 0 | |
2324 | && signal_pass_state (signo) == 1) | |
2325 | { | |
2326 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
2327 | here? It is not clear we should. GDB may not expect | |
2328 | other threads to run. On the other hand, not resuming | |
2329 | newly attached threads may cause an unwanted delay in | |
2330 | getting them running. */ | |
2331 | registers_changed (); | |
10d6c8cd DJ |
2332 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
2333 | lp->step, signo); | |
d6b0e80f AC |
2334 | if (debug_linux_nat) |
2335 | fprintf_unfiltered (gdb_stdlog, | |
2336 | "LLW: %s %s, %s (preempt 'handle')\n", | |
2337 | lp->step ? | |
2338 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2339 | target_pid_to_str (lp->ptid), | |
2340 | signo ? strsignal (signo) : "0"); | |
2341 | lp->stopped = 0; | |
2342 | status = 0; | |
2343 | goto retry; | |
2344 | } | |
2345 | ||
2346 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
2347 | { | |
2348 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
2349 | forwarded to the entire process group, that is, all LWP's | |
2350 | will receive it. Since we only want to report it once, | |
2351 | we try to flush it from all LWPs except this one. */ | |
2352 | sigaddset (&flush_mask, SIGINT); | |
2353 | } | |
2354 | } | |
2355 | ||
2356 | /* This LWP is stopped now. */ | |
2357 | lp->stopped = 1; | |
2358 | ||
2359 | if (debug_linux_nat) | |
2360 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
2361 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
2362 | ||
2363 | /* Now stop all other LWP's ... */ | |
2364 | iterate_over_lwps (stop_callback, NULL); | |
2365 | ||
2366 | /* ... and wait until all of them have reported back that they're no | |
2367 | longer running. */ | |
2368 | iterate_over_lwps (stop_wait_callback, &flush_mask); | |
2369 | iterate_over_lwps (flush_callback, &flush_mask); | |
2370 | ||
2371 | /* If we're not waiting for a specific LWP, choose an event LWP from | |
2372 | among those that have had events. Giving equal priority to all | |
2373 | LWPs that have had events helps prevent starvation. */ | |
2374 | if (pid == -1) | |
2375 | select_event_lwp (&lp, &status); | |
2376 | ||
2377 | /* Now that we've selected our final event LWP, cancel any | |
2378 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
2379 | the comment in cancel_breakpoints_callback to find out why. */ | |
2380 | iterate_over_lwps (cancel_breakpoints_callback, lp); | |
2381 | ||
2382 | /* If we're not running in "threaded" mode, we'll report the bare | |
2383 | process id. */ | |
2384 | ||
2385 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) | |
2386 | { | |
2387 | trap_ptid = (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid))); | |
2388 | if (debug_linux_nat) | |
2389 | fprintf_unfiltered (gdb_stdlog, | |
2390 | "LLW: trap_ptid is %s.\n", | |
2391 | target_pid_to_str (trap_ptid)); | |
2392 | } | |
2393 | else | |
2394 | trap_ptid = null_ptid; | |
2395 | ||
2396 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2397 | { | |
2398 | *ourstatus = lp->waitstatus; | |
2399 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
2400 | } | |
2401 | else | |
2402 | store_waitstatus (ourstatus, status); | |
2403 | ||
2404 | return (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid))); | |
2405 | } | |
2406 | ||
2407 | static int | |
2408 | kill_callback (struct lwp_info *lp, void *data) | |
2409 | { | |
2410 | errno = 0; | |
2411 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
2412 | if (debug_linux_nat) | |
2413 | fprintf_unfiltered (gdb_stdlog, | |
2414 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
2415 | target_pid_to_str (lp->ptid), | |
2416 | errno ? safe_strerror (errno) : "OK"); | |
2417 | ||
2418 | return 0; | |
2419 | } | |
2420 | ||
2421 | static int | |
2422 | kill_wait_callback (struct lwp_info *lp, void *data) | |
2423 | { | |
2424 | pid_t pid; | |
2425 | ||
2426 | /* We must make sure that there are no pending events (delayed | |
2427 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
2428 | program doesn't interfere with any following debugging session. */ | |
2429 | ||
2430 | /* For cloned processes we must check both with __WCLONE and | |
2431 | without, since the exit status of a cloned process isn't reported | |
2432 | with __WCLONE. */ | |
2433 | if (lp->cloned) | |
2434 | { | |
2435 | do | |
2436 | { | |
58aecb61 | 2437 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
d6b0e80f AC |
2438 | if (pid != (pid_t) -1 && debug_linux_nat) |
2439 | { | |
2440 | fprintf_unfiltered (gdb_stdlog, | |
2441 | "KWC: wait %s received unknown.\n", | |
2442 | target_pid_to_str (lp->ptid)); | |
2443 | } | |
2444 | } | |
2445 | while (pid == GET_LWP (lp->ptid)); | |
2446 | ||
2447 | gdb_assert (pid == -1 && errno == ECHILD); | |
2448 | } | |
2449 | ||
2450 | do | |
2451 | { | |
58aecb61 | 2452 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
d6b0e80f AC |
2453 | if (pid != (pid_t) -1 && debug_linux_nat) |
2454 | { | |
2455 | fprintf_unfiltered (gdb_stdlog, | |
2456 | "KWC: wait %s received unk.\n", | |
2457 | target_pid_to_str (lp->ptid)); | |
2458 | } | |
2459 | } | |
2460 | while (pid == GET_LWP (lp->ptid)); | |
2461 | ||
2462 | gdb_assert (pid == -1 && errno == ECHILD); | |
2463 | return 0; | |
2464 | } | |
2465 | ||
2466 | static void | |
2467 | linux_nat_kill (void) | |
2468 | { | |
2469 | /* Kill all LWP's ... */ | |
2470 | iterate_over_lwps (kill_callback, NULL); | |
2471 | ||
2472 | /* ... and wait until we've flushed all events. */ | |
2473 | iterate_over_lwps (kill_wait_callback, NULL); | |
2474 | ||
2475 | target_mourn_inferior (); | |
2476 | } | |
2477 | ||
2478 | static void | |
2479 | linux_nat_create_inferior (char *exec_file, char *allargs, char **env, | |
2480 | int from_tty) | |
2481 | { | |
10d6c8cd | 2482 | linux_ops->to_create_inferior (exec_file, allargs, env, from_tty); |
d6b0e80f AC |
2483 | } |
2484 | ||
2485 | static void | |
2486 | linux_nat_mourn_inferior (void) | |
2487 | { | |
2488 | trap_ptid = null_ptid; | |
2489 | ||
2490 | /* Destroy LWP info; it's no longer valid. */ | |
2491 | init_lwp_list (); | |
2492 | ||
2493 | /* Restore the original signal mask. */ | |
2494 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); | |
2495 | sigemptyset (&blocked_mask); | |
2496 | ||
10d6c8cd | 2497 | linux_ops->to_mourn_inferior (); |
d6b0e80f AC |
2498 | } |
2499 | ||
10d6c8cd DJ |
2500 | static LONGEST |
2501 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
2502 | const char *annex, gdb_byte *readbuf, | |
2503 | const gdb_byte *writebuf, | |
2504 | ULONGEST offset, LONGEST len) | |
d6b0e80f AC |
2505 | { |
2506 | struct cleanup *old_chain = save_inferior_ptid (); | |
10d6c8cd | 2507 | LONGEST xfer; |
d6b0e80f AC |
2508 | |
2509 | if (is_lwp (inferior_ptid)) | |
2510 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
2511 | ||
10d6c8cd DJ |
2512 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
2513 | offset, len); | |
d6b0e80f AC |
2514 | |
2515 | do_cleanups (old_chain); | |
2516 | return xfer; | |
2517 | } | |
2518 | ||
2519 | static int | |
2520 | linux_nat_thread_alive (ptid_t ptid) | |
2521 | { | |
2522 | gdb_assert (is_lwp (ptid)); | |
2523 | ||
2524 | errno = 0; | |
2525 | ptrace (PTRACE_PEEKUSER, GET_LWP (ptid), 0, 0); | |
2526 | if (debug_linux_nat) | |
2527 | fprintf_unfiltered (gdb_stdlog, | |
2528 | "LLTA: PTRACE_PEEKUSER %s, 0, 0 (%s)\n", | |
2529 | target_pid_to_str (ptid), | |
2530 | errno ? safe_strerror (errno) : "OK"); | |
2531 | if (errno) | |
2532 | return 0; | |
2533 | ||
2534 | return 1; | |
2535 | } | |
2536 | ||
2537 | static char * | |
2538 | linux_nat_pid_to_str (ptid_t ptid) | |
2539 | { | |
2540 | static char buf[64]; | |
2541 | ||
2542 | if (is_lwp (ptid)) | |
2543 | { | |
2544 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
2545 | return buf; | |
2546 | } | |
2547 | ||
2548 | return normal_pid_to_str (ptid); | |
2549 | } | |
2550 | ||
10d6c8cd DJ |
2551 | static void |
2552 | linux_nat_fetch_registers (int regnum) | |
2553 | { | |
2554 | /* to_fetch_registers will honor the LWP ID, so we can use it directly. */ | |
2555 | linux_ops->to_fetch_registers (regnum); | |
2556 | } | |
2557 | ||
2558 | static void | |
2559 | linux_nat_store_registers (int regnum) | |
2560 | { | |
2561 | /* to_store_registers will honor the LWP ID, so we can use it directly. */ | |
2562 | linux_ops->to_store_registers (regnum); | |
2563 | } | |
2564 | ||
2565 | static void | |
2566 | linux_nat_child_post_startup_inferior (ptid_t ptid) | |
2567 | { | |
2568 | linux_ops->to_post_startup_inferior (ptid); | |
2569 | } | |
2570 | ||
d6b0e80f AC |
2571 | static void |
2572 | init_linux_nat_ops (void) | |
2573 | { | |
2574 | #if 0 | |
2575 | linux_nat_ops.to_open = linux_nat_open; | |
2576 | #endif | |
2577 | linux_nat_ops.to_shortname = "lwp-layer"; | |
2578 | linux_nat_ops.to_longname = "lwp-layer"; | |
2579 | linux_nat_ops.to_doc = "Low level threads support (LWP layer)"; | |
2580 | linux_nat_ops.to_attach = linux_nat_attach; | |
2581 | linux_nat_ops.to_detach = linux_nat_detach; | |
2582 | linux_nat_ops.to_resume = linux_nat_resume; | |
2583 | linux_nat_ops.to_wait = linux_nat_wait; | |
10d6c8cd DJ |
2584 | linux_nat_ops.to_fetch_registers = linux_nat_fetch_registers; |
2585 | linux_nat_ops.to_store_registers = linux_nat_store_registers; | |
2586 | linux_nat_ops.to_xfer_partial = linux_nat_xfer_partial; | |
d6b0e80f AC |
2587 | linux_nat_ops.to_kill = linux_nat_kill; |
2588 | linux_nat_ops.to_create_inferior = linux_nat_create_inferior; | |
2589 | linux_nat_ops.to_mourn_inferior = linux_nat_mourn_inferior; | |
2590 | linux_nat_ops.to_thread_alive = linux_nat_thread_alive; | |
2591 | linux_nat_ops.to_pid_to_str = linux_nat_pid_to_str; | |
10d6c8cd DJ |
2592 | linux_nat_ops.to_post_startup_inferior |
2593 | = linux_nat_child_post_startup_inferior; | |
d6b0e80f AC |
2594 | linux_nat_ops.to_post_attach = child_post_attach; |
2595 | linux_nat_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint; | |
2596 | linux_nat_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint; | |
2597 | linux_nat_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint; | |
2598 | ||
2599 | linux_nat_ops.to_stratum = thread_stratum; | |
2600 | linux_nat_ops.to_has_thread_control = tc_schedlock; | |
2601 | linux_nat_ops.to_magic = OPS_MAGIC; | |
2602 | } | |
2603 | ||
2604 | static void | |
2605 | sigchld_handler (int signo) | |
2606 | { | |
2607 | /* Do nothing. The only reason for this handler is that it allows | |
2608 | us to use sigsuspend in linux_nat_wait above to wait for the | |
2609 | arrival of a SIGCHLD. */ | |
2610 | } | |
2611 | ||
dba24537 AC |
2612 | /* Accepts an integer PID; Returns a string representing a file that |
2613 | can be opened to get the symbols for the child process. */ | |
2614 | ||
2615 | char * | |
2616 | child_pid_to_exec_file (int pid) | |
2617 | { | |
2618 | char *name1, *name2; | |
2619 | ||
2620 | name1 = xmalloc (MAXPATHLEN); | |
2621 | name2 = xmalloc (MAXPATHLEN); | |
2622 | make_cleanup (xfree, name1); | |
2623 | make_cleanup (xfree, name2); | |
2624 | memset (name2, 0, MAXPATHLEN); | |
2625 | ||
2626 | sprintf (name1, "/proc/%d/exe", pid); | |
2627 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
2628 | return name2; | |
2629 | else | |
2630 | return name1; | |
2631 | } | |
2632 | ||
2633 | /* Service function for corefiles and info proc. */ | |
2634 | ||
2635 | static int | |
2636 | read_mapping (FILE *mapfile, | |
2637 | long long *addr, | |
2638 | long long *endaddr, | |
2639 | char *permissions, | |
2640 | long long *offset, | |
2641 | char *device, long long *inode, char *filename) | |
2642 | { | |
2643 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
2644 | addr, endaddr, permissions, offset, device, inode); | |
2645 | ||
2e14c2ea MS |
2646 | filename[0] = '\0'; |
2647 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
2648 | { |
2649 | /* Eat everything up to EOL for the filename. This will prevent | |
2650 | weird filenames (such as one with embedded whitespace) from | |
2651 | confusing this code. It also makes this code more robust in | |
2652 | respect to annotations the kernel may add after the filename. | |
2653 | ||
2654 | Note the filename is used for informational purposes | |
2655 | only. */ | |
2656 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
2657 | } | |
2e14c2ea | 2658 | |
dba24537 AC |
2659 | return (ret != 0 && ret != EOF); |
2660 | } | |
2661 | ||
2662 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
2663 | regions in the inferior for a corefile. */ | |
2664 | ||
2665 | static int | |
2666 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
2667 | unsigned long, | |
2668 | int, int, int, void *), void *obfd) | |
2669 | { | |
2670 | long long pid = PIDGET (inferior_ptid); | |
2671 | char mapsfilename[MAXPATHLEN]; | |
2672 | FILE *mapsfile; | |
2673 | long long addr, endaddr, size, offset, inode; | |
2674 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
2675 | int read, write, exec; | |
2676 | int ret; | |
2677 | ||
2678 | /* Compose the filename for the /proc memory map, and open it. */ | |
2679 | sprintf (mapsfilename, "/proc/%lld/maps", pid); | |
2680 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) | |
8a3fe4f8 | 2681 | error (_("Could not open %s."), mapsfilename); |
dba24537 AC |
2682 | |
2683 | if (info_verbose) | |
2684 | fprintf_filtered (gdb_stdout, | |
2685 | "Reading memory regions from %s\n", mapsfilename); | |
2686 | ||
2687 | /* Now iterate until end-of-file. */ | |
2688 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
2689 | &offset, &device[0], &inode, &filename[0])) | |
2690 | { | |
2691 | size = endaddr - addr; | |
2692 | ||
2693 | /* Get the segment's permissions. */ | |
2694 | read = (strchr (permissions, 'r') != 0); | |
2695 | write = (strchr (permissions, 'w') != 0); | |
2696 | exec = (strchr (permissions, 'x') != 0); | |
2697 | ||
2698 | if (info_verbose) | |
2699 | { | |
2700 | fprintf_filtered (gdb_stdout, | |
2701 | "Save segment, %lld bytes at 0x%s (%c%c%c)", | |
2702 | size, paddr_nz (addr), | |
2703 | read ? 'r' : ' ', | |
2704 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
2705 | if (filename && filename[0]) | |
2706 | fprintf_filtered (gdb_stdout, " for %s", filename); | |
2707 | fprintf_filtered (gdb_stdout, "\n"); | |
2708 | } | |
2709 | ||
2710 | /* Invoke the callback function to create the corefile | |
2711 | segment. */ | |
2712 | func (addr, size, read, write, exec, obfd); | |
2713 | } | |
2714 | fclose (mapsfile); | |
2715 | return 0; | |
2716 | } | |
2717 | ||
2718 | /* Records the thread's register state for the corefile note | |
2719 | section. */ | |
2720 | ||
2721 | static char * | |
2722 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2723 | char *note_data, int *note_size) | |
2724 | { | |
2725 | gdb_gregset_t gregs; | |
2726 | gdb_fpregset_t fpregs; | |
2727 | #ifdef FILL_FPXREGSET | |
2728 | gdb_fpxregset_t fpxregs; | |
2729 | #endif | |
2730 | unsigned long lwp = ptid_get_lwp (ptid); | |
2731 | ||
2732 | fill_gregset (&gregs, -1); | |
2733 | note_data = (char *) elfcore_write_prstatus (obfd, | |
2734 | note_data, | |
2735 | note_size, | |
2736 | lwp, | |
2737 | stop_signal, &gregs); | |
2738 | ||
2739 | fill_fpregset (&fpregs, -1); | |
2740 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
2741 | note_data, | |
2742 | note_size, | |
2743 | &fpregs, sizeof (fpregs)); | |
2744 | #ifdef FILL_FPXREGSET | |
2745 | fill_fpxregset (&fpxregs, -1); | |
2746 | note_data = (char *) elfcore_write_prxfpreg (obfd, | |
2747 | note_data, | |
2748 | note_size, | |
2749 | &fpxregs, sizeof (fpxregs)); | |
2750 | #endif | |
2751 | return note_data; | |
2752 | } | |
2753 | ||
2754 | struct linux_nat_corefile_thread_data | |
2755 | { | |
2756 | bfd *obfd; | |
2757 | char *note_data; | |
2758 | int *note_size; | |
2759 | int num_notes; | |
2760 | }; | |
2761 | ||
2762 | /* Called by gdbthread.c once per thread. Records the thread's | |
2763 | register state for the corefile note section. */ | |
2764 | ||
2765 | static int | |
2766 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
2767 | { | |
2768 | struct linux_nat_corefile_thread_data *args = data; | |
2769 | ptid_t saved_ptid = inferior_ptid; | |
2770 | ||
2771 | inferior_ptid = ti->ptid; | |
2772 | registers_changed (); | |
2773 | target_fetch_registers (-1); /* FIXME should not be necessary; | |
2774 | fill_gregset should do it automatically. */ | |
2775 | args->note_data = linux_nat_do_thread_registers (args->obfd, | |
2776 | ti->ptid, | |
2777 | args->note_data, | |
2778 | args->note_size); | |
2779 | args->num_notes++; | |
2780 | inferior_ptid = saved_ptid; | |
2781 | registers_changed (); | |
2782 | target_fetch_registers (-1); /* FIXME should not be necessary; | |
2783 | fill_gregset should do it automatically. */ | |
2784 | return 0; | |
2785 | } | |
2786 | ||
2787 | /* Records the register state for the corefile note section. */ | |
2788 | ||
2789 | static char * | |
2790 | linux_nat_do_registers (bfd *obfd, ptid_t ptid, | |
2791 | char *note_data, int *note_size) | |
2792 | { | |
2793 | registers_changed (); | |
2794 | target_fetch_registers (-1); /* FIXME should not be necessary; | |
2795 | fill_gregset should do it automatically. */ | |
2796 | return linux_nat_do_thread_registers (obfd, | |
2797 | ptid_build (ptid_get_pid (inferior_ptid), | |
2798 | ptid_get_pid (inferior_ptid), | |
2799 | 0), | |
2800 | note_data, note_size); | |
2801 | return note_data; | |
2802 | } | |
2803 | ||
2804 | /* Fills the "to_make_corefile_note" target vector. Builds the note | |
2805 | section for a corefile, and returns it in a malloc buffer. */ | |
2806 | ||
2807 | static char * | |
2808 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
2809 | { | |
2810 | struct linux_nat_corefile_thread_data thread_args; | |
2811 | struct cleanup *old_chain; | |
2812 | char fname[16] = { '\0' }; | |
2813 | char psargs[80] = { '\0' }; | |
2814 | char *note_data = NULL; | |
2815 | ptid_t current_ptid = inferior_ptid; | |
c6826062 | 2816 | gdb_byte *auxv; |
dba24537 AC |
2817 | int auxv_len; |
2818 | ||
2819 | if (get_exec_file (0)) | |
2820 | { | |
2821 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
2822 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
2823 | if (get_inferior_args ()) | |
2824 | { | |
2825 | strncat (psargs, " ", sizeof (psargs) - strlen (psargs)); | |
2826 | strncat (psargs, get_inferior_args (), | |
2827 | sizeof (psargs) - strlen (psargs)); | |
2828 | } | |
2829 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
2830 | note_data, | |
2831 | note_size, fname, psargs); | |
2832 | } | |
2833 | ||
2834 | /* Dump information for threads. */ | |
2835 | thread_args.obfd = obfd; | |
2836 | thread_args.note_data = note_data; | |
2837 | thread_args.note_size = note_size; | |
2838 | thread_args.num_notes = 0; | |
2839 | iterate_over_lwps (linux_nat_corefile_thread_callback, &thread_args); | |
2840 | if (thread_args.num_notes == 0) | |
2841 | { | |
2842 | /* iterate_over_threads didn't come up with any threads; just | |
2843 | use inferior_ptid. */ | |
2844 | note_data = linux_nat_do_registers (obfd, inferior_ptid, | |
2845 | note_data, note_size); | |
2846 | } | |
2847 | else | |
2848 | { | |
2849 | note_data = thread_args.note_data; | |
2850 | } | |
2851 | ||
2852 | auxv_len = target_auxv_read (¤t_target, &auxv); | |
2853 | if (auxv_len > 0) | |
2854 | { | |
2855 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
2856 | "CORE", NT_AUXV, auxv, auxv_len); | |
2857 | xfree (auxv); | |
2858 | } | |
2859 | ||
2860 | make_cleanup (xfree, note_data); | |
2861 | return note_data; | |
2862 | } | |
2863 | ||
2864 | /* Implement the "info proc" command. */ | |
2865 | ||
2866 | static void | |
2867 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
2868 | { | |
2869 | long long pid = PIDGET (inferior_ptid); | |
2870 | FILE *procfile; | |
2871 | char **argv = NULL; | |
2872 | char buffer[MAXPATHLEN]; | |
2873 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
2874 | int cmdline_f = 1; | |
2875 | int cwd_f = 1; | |
2876 | int exe_f = 1; | |
2877 | int mappings_f = 0; | |
2878 | int environ_f = 0; | |
2879 | int status_f = 0; | |
2880 | int stat_f = 0; | |
2881 | int all = 0; | |
2882 | struct stat dummy; | |
2883 | ||
2884 | if (args) | |
2885 | { | |
2886 | /* Break up 'args' into an argv array. */ | |
2887 | if ((argv = buildargv (args)) == NULL) | |
2888 | nomem (0); | |
2889 | else | |
2890 | make_cleanup_freeargv (argv); | |
2891 | } | |
2892 | while (argv != NULL && *argv != NULL) | |
2893 | { | |
2894 | if (isdigit (argv[0][0])) | |
2895 | { | |
2896 | pid = strtoul (argv[0], NULL, 10); | |
2897 | } | |
2898 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
2899 | { | |
2900 | mappings_f = 1; | |
2901 | } | |
2902 | else if (strcmp (argv[0], "status") == 0) | |
2903 | { | |
2904 | status_f = 1; | |
2905 | } | |
2906 | else if (strcmp (argv[0], "stat") == 0) | |
2907 | { | |
2908 | stat_f = 1; | |
2909 | } | |
2910 | else if (strcmp (argv[0], "cmd") == 0) | |
2911 | { | |
2912 | cmdline_f = 1; | |
2913 | } | |
2914 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
2915 | { | |
2916 | exe_f = 1; | |
2917 | } | |
2918 | else if (strcmp (argv[0], "cwd") == 0) | |
2919 | { | |
2920 | cwd_f = 1; | |
2921 | } | |
2922 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
2923 | { | |
2924 | all = 1; | |
2925 | } | |
2926 | else | |
2927 | { | |
2928 | /* [...] (future options here) */ | |
2929 | } | |
2930 | argv++; | |
2931 | } | |
2932 | if (pid == 0) | |
8a3fe4f8 | 2933 | error (_("No current process: you must name one.")); |
dba24537 AC |
2934 | |
2935 | sprintf (fname1, "/proc/%lld", pid); | |
2936 | if (stat (fname1, &dummy) != 0) | |
8a3fe4f8 | 2937 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 2938 | |
a3f17187 | 2939 | printf_filtered (_("process %lld\n"), pid); |
dba24537 AC |
2940 | if (cmdline_f || all) |
2941 | { | |
2942 | sprintf (fname1, "/proc/%lld/cmdline", pid); | |
2943 | if ((procfile = fopen (fname1, "r")) > 0) | |
2944 | { | |
2945 | fgets (buffer, sizeof (buffer), procfile); | |
2946 | printf_filtered ("cmdline = '%s'\n", buffer); | |
2947 | fclose (procfile); | |
2948 | } | |
2949 | else | |
8a3fe4f8 | 2950 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
2951 | } |
2952 | if (cwd_f || all) | |
2953 | { | |
2954 | sprintf (fname1, "/proc/%lld/cwd", pid); | |
2955 | memset (fname2, 0, sizeof (fname2)); | |
2956 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
2957 | printf_filtered ("cwd = '%s'\n", fname2); | |
2958 | else | |
8a3fe4f8 | 2959 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
2960 | } |
2961 | if (exe_f || all) | |
2962 | { | |
2963 | sprintf (fname1, "/proc/%lld/exe", pid); | |
2964 | memset (fname2, 0, sizeof (fname2)); | |
2965 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
2966 | printf_filtered ("exe = '%s'\n", fname2); | |
2967 | else | |
8a3fe4f8 | 2968 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
2969 | } |
2970 | if (mappings_f || all) | |
2971 | { | |
2972 | sprintf (fname1, "/proc/%lld/maps", pid); | |
2973 | if ((procfile = fopen (fname1, "r")) > 0) | |
2974 | { | |
2975 | long long addr, endaddr, size, offset, inode; | |
2976 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
2977 | ||
a3f17187 | 2978 | printf_filtered (_("Mapped address spaces:\n\n")); |
dba24537 AC |
2979 | if (TARGET_ADDR_BIT == 32) |
2980 | { | |
2981 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
2982 | "Start Addr", | |
2983 | " End Addr", | |
2984 | " Size", " Offset", "objfile"); | |
2985 | } | |
2986 | else | |
2987 | { | |
2988 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
2989 | "Start Addr", | |
2990 | " End Addr", | |
2991 | " Size", " Offset", "objfile"); | |
2992 | } | |
2993 | ||
2994 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
2995 | &offset, &device[0], &inode, &filename[0])) | |
2996 | { | |
2997 | size = endaddr - addr; | |
2998 | ||
2999 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
3000 | calls here (and possibly above) should be abstracted | |
3001 | out into their own functions? Andrew suggests using | |
3002 | a generic local_address_string instead to print out | |
3003 | the addresses; that makes sense to me, too. */ | |
3004 | ||
3005 | if (TARGET_ADDR_BIT == 32) | |
3006 | { | |
3007 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
3008 | (unsigned long) addr, /* FIXME: pr_addr */ | |
3009 | (unsigned long) endaddr, | |
3010 | (int) size, | |
3011 | (unsigned int) offset, | |
3012 | filename[0] ? filename : ""); | |
3013 | } | |
3014 | else | |
3015 | { | |
3016 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
3017 | (unsigned long) addr, /* FIXME: pr_addr */ | |
3018 | (unsigned long) endaddr, | |
3019 | (int) size, | |
3020 | (unsigned int) offset, | |
3021 | filename[0] ? filename : ""); | |
3022 | } | |
3023 | } | |
3024 | ||
3025 | fclose (procfile); | |
3026 | } | |
3027 | else | |
8a3fe4f8 | 3028 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3029 | } |
3030 | if (status_f || all) | |
3031 | { | |
3032 | sprintf (fname1, "/proc/%lld/status", pid); | |
3033 | if ((procfile = fopen (fname1, "r")) > 0) | |
3034 | { | |
3035 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) | |
3036 | puts_filtered (buffer); | |
3037 | fclose (procfile); | |
3038 | } | |
3039 | else | |
8a3fe4f8 | 3040 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3041 | } |
3042 | if (stat_f || all) | |
3043 | { | |
3044 | sprintf (fname1, "/proc/%lld/stat", pid); | |
3045 | if ((procfile = fopen (fname1, "r")) > 0) | |
3046 | { | |
3047 | int itmp; | |
3048 | char ctmp; | |
3049 | ||
3050 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 3051 | printf_filtered (_("Process: %d\n"), itmp); |
dba24537 | 3052 | if (fscanf (procfile, "%s ", &buffer[0]) > 0) |
a3f17187 | 3053 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 3054 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 3055 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 3056 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3057 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 3058 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3059 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 3060 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3061 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 3062 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3063 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 3064 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3065 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
dba24537 | 3066 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 3067 | printf_filtered (_("Flags: 0x%x\n"), itmp); |
dba24537 | 3068 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 3069 | printf_filtered (_("Minor faults (no memory page): %u\n"), |
dba24537 AC |
3070 | (unsigned int) itmp); |
3071 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3072 | printf_filtered (_("Minor faults, children: %u\n"), |
dba24537 AC |
3073 | (unsigned int) itmp); |
3074 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3075 | printf_filtered (_("Major faults (memory page faults): %u\n"), |
dba24537 AC |
3076 | (unsigned int) itmp); |
3077 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3078 | printf_filtered (_("Major faults, children: %u\n"), |
dba24537 AC |
3079 | (unsigned int) itmp); |
3080 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
3081 | printf_filtered ("utime: %d\n", itmp); | |
3082 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
3083 | printf_filtered ("stime: %d\n", itmp); | |
3084 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
3085 | printf_filtered ("utime, children: %d\n", itmp); | |
3086 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
3087 | printf_filtered ("stime, children: %d\n", itmp); | |
3088 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 3089 | printf_filtered (_("jiffies remaining in current time slice: %d\n"), |
dba24537 AC |
3090 | itmp); |
3091 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
3092 | printf_filtered ("'nice' value: %d\n", itmp); | |
3093 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3094 | printf_filtered (_("jiffies until next timeout: %u\n"), |
dba24537 AC |
3095 | (unsigned int) itmp); |
3096 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
3097 | printf_filtered ("jiffies until next SIGALRM: %u\n", | |
3098 | (unsigned int) itmp); | |
3099 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 3100 | printf_filtered (_("start time (jiffies since system boot): %d\n"), |
dba24537 AC |
3101 | itmp); |
3102 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3103 | printf_filtered (_("Virtual memory size: %u\n"), |
dba24537 AC |
3104 | (unsigned int) itmp); |
3105 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3106 | printf_filtered (_("Resident set size: %u\n"), (unsigned int) itmp); |
dba24537 AC |
3107 | if (fscanf (procfile, "%u ", &itmp) > 0) |
3108 | printf_filtered ("rlim: %u\n", (unsigned int) itmp); | |
3109 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3110 | printf_filtered (_("Start of text: 0x%x\n"), itmp); |
dba24537 | 3111 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 3112 | printf_filtered (_("End of text: 0x%x\n"), itmp); |
dba24537 | 3113 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 3114 | printf_filtered (_("Start of stack: 0x%x\n"), itmp); |
dba24537 AC |
3115 | #if 0 /* Don't know how architecture-dependent the rest is... |
3116 | Anyway the signal bitmap info is available from "status". */ | |
3117 | if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ | |
a3f17187 | 3118 | printf_filtered (_("Kernel stack pointer: 0x%x\n"), itmp); |
dba24537 | 3119 | if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ |
a3f17187 | 3120 | printf_filtered (_("Kernel instr pointer: 0x%x\n"), itmp); |
dba24537 | 3121 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3122 | printf_filtered (_("Pending signals bitmap: 0x%x\n"), itmp); |
dba24537 | 3123 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3124 | printf_filtered (_("Blocked signals bitmap: 0x%x\n"), itmp); |
dba24537 | 3125 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3126 | printf_filtered (_("Ignored signals bitmap: 0x%x\n"), itmp); |
dba24537 | 3127 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3128 | printf_filtered (_("Catched signals bitmap: 0x%x\n"), itmp); |
dba24537 | 3129 | if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ |
a3f17187 | 3130 | printf_filtered (_("wchan (system call): 0x%x\n"), itmp); |
dba24537 AC |
3131 | #endif |
3132 | fclose (procfile); | |
3133 | } | |
3134 | else | |
8a3fe4f8 | 3135 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3136 | } |
3137 | } | |
3138 | ||
10d6c8cd DJ |
3139 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
3140 | filesystem. Because we can use a single read() call for /proc, this | |
3141 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
3142 | but it doesn't support writes. */ | |
3143 | ||
3144 | static LONGEST | |
3145 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
3146 | const char *annex, gdb_byte *readbuf, | |
3147 | const gdb_byte *writebuf, | |
3148 | ULONGEST offset, LONGEST len) | |
dba24537 | 3149 | { |
10d6c8cd DJ |
3150 | LONGEST ret; |
3151 | int fd; | |
dba24537 AC |
3152 | char filename[64]; |
3153 | ||
10d6c8cd | 3154 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
3155 | return 0; |
3156 | ||
3157 | /* Don't bother for one word. */ | |
3158 | if (len < 3 * sizeof (long)) | |
3159 | return 0; | |
3160 | ||
3161 | /* We could keep this file open and cache it - possibly one per | |
3162 | thread. That requires some juggling, but is even faster. */ | |
3163 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
3164 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
3165 | if (fd == -1) | |
3166 | return 0; | |
3167 | ||
3168 | /* If pread64 is available, use it. It's faster if the kernel | |
3169 | supports it (only one syscall), and it's 64-bit safe even on | |
3170 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
3171 | application). */ | |
3172 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 3173 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 3174 | #else |
10d6c8cd | 3175 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
3176 | #endif |
3177 | ret = 0; | |
3178 | else | |
3179 | ret = len; | |
3180 | ||
3181 | close (fd); | |
3182 | return ret; | |
3183 | } | |
3184 | ||
3185 | /* Parse LINE as a signal set and add its set bits to SIGS. */ | |
3186 | ||
3187 | static void | |
3188 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
3189 | { | |
3190 | int len = strlen (line) - 1; | |
3191 | const char *p; | |
3192 | int signum; | |
3193 | ||
3194 | if (line[len] != '\n') | |
8a3fe4f8 | 3195 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
3196 | |
3197 | p = line; | |
3198 | signum = len * 4; | |
3199 | while (len-- > 0) | |
3200 | { | |
3201 | int digit; | |
3202 | ||
3203 | if (*p >= '0' && *p <= '9') | |
3204 | digit = *p - '0'; | |
3205 | else if (*p >= 'a' && *p <= 'f') | |
3206 | digit = *p - 'a' + 10; | |
3207 | else | |
8a3fe4f8 | 3208 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
3209 | |
3210 | signum -= 4; | |
3211 | ||
3212 | if (digit & 1) | |
3213 | sigaddset (sigs, signum + 1); | |
3214 | if (digit & 2) | |
3215 | sigaddset (sigs, signum + 2); | |
3216 | if (digit & 4) | |
3217 | sigaddset (sigs, signum + 3); | |
3218 | if (digit & 8) | |
3219 | sigaddset (sigs, signum + 4); | |
3220 | ||
3221 | p++; | |
3222 | } | |
3223 | } | |
3224 | ||
3225 | /* Find process PID's pending signals from /proc/pid/status and set | |
3226 | SIGS to match. */ | |
3227 | ||
3228 | void | |
3229 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
3230 | { | |
3231 | FILE *procfile; | |
3232 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
3233 | int signum; | |
3234 | ||
3235 | sigemptyset (pending); | |
3236 | sigemptyset (blocked); | |
3237 | sigemptyset (ignored); | |
3238 | sprintf (fname, "/proc/%d/status", pid); | |
3239 | procfile = fopen (fname, "r"); | |
3240 | if (procfile == NULL) | |
8a3fe4f8 | 3241 | error (_("Could not open %s"), fname); |
dba24537 AC |
3242 | |
3243 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
3244 | { | |
3245 | /* Normal queued signals are on the SigPnd line in the status | |
3246 | file. However, 2.6 kernels also have a "shared" pending | |
3247 | queue for delivering signals to a thread group, so check for | |
3248 | a ShdPnd line also. | |
3249 | ||
3250 | Unfortunately some Red Hat kernels include the shared pending | |
3251 | queue but not the ShdPnd status field. */ | |
3252 | ||
3253 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
3254 | add_line_to_sigset (buffer + 8, pending); | |
3255 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
3256 | add_line_to_sigset (buffer + 8, pending); | |
3257 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
3258 | add_line_to_sigset (buffer + 8, blocked); | |
3259 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
3260 | add_line_to_sigset (buffer + 8, ignored); | |
3261 | } | |
3262 | ||
3263 | fclose (procfile); | |
3264 | } | |
3265 | ||
10d6c8cd DJ |
3266 | static LONGEST |
3267 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
3268 | const char *annex, gdb_byte *readbuf, | |
3269 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3270 | { | |
3271 | LONGEST xfer; | |
3272 | ||
3273 | if (object == TARGET_OBJECT_AUXV) | |
3274 | return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf, | |
3275 | offset, len); | |
3276 | ||
3277 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, | |
3278 | offset, len); | |
3279 | if (xfer != 0) | |
3280 | return xfer; | |
3281 | ||
3282 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
3283 | offset, len); | |
3284 | } | |
3285 | ||
3286 | #ifndef FETCH_INFERIOR_REGISTERS | |
3287 | ||
3288 | /* Return the address in the core dump or inferior of register | |
3289 | REGNO. */ | |
3290 | ||
3291 | static CORE_ADDR | |
3292 | linux_register_u_offset (int regno) | |
3293 | { | |
3294 | /* FIXME drow/2005-09-04: The hardcoded use of register_addr should go | |
3295 | away. This requires disentangling the various definitions of it | |
3296 | (particularly alpha-nat.c's). */ | |
3297 | return register_addr (regno, 0); | |
3298 | } | |
3299 | ||
3300 | #endif | |
3301 | ||
3302 | /* Create a prototype generic Linux target. The client can override | |
3303 | it with local methods. */ | |
3304 | ||
3305 | struct target_ops * | |
3306 | linux_target (void) | |
3307 | { | |
3308 | struct target_ops *t; | |
3309 | ||
3310 | #ifdef FETCH_INFERIOR_REGISTERS | |
3311 | t = inf_ptrace_target (); | |
3312 | #else | |
3313 | t = inf_ptrace_trad_target (linux_register_u_offset); | |
3314 | #endif | |
3315 | t->to_wait = child_wait; | |
3316 | t->to_kill = kill_inferior; | |
3317 | t->to_insert_fork_catchpoint = child_insert_fork_catchpoint; | |
3318 | t->to_insert_vfork_catchpoint = child_insert_vfork_catchpoint; | |
3319 | t->to_insert_exec_catchpoint = child_insert_exec_catchpoint; | |
3320 | t->to_pid_to_exec_file = child_pid_to_exec_file; | |
3321 | t->to_post_startup_inferior = linux_child_post_startup_inferior; | |
3322 | t->to_post_attach = child_post_attach; | |
3323 | t->to_follow_fork = child_follow_fork; | |
3324 | t->to_find_memory_regions = linux_nat_find_memory_regions; | |
3325 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
3326 | ||
3327 | super_xfer_partial = t->to_xfer_partial; | |
3328 | t->to_xfer_partial = linux_xfer_partial; | |
3329 | ||
ac264b3b MS |
3330 | super_mourn_inferior = t->to_mourn_inferior; |
3331 | t->to_mourn_inferior = child_mourn_inferior; | |
3332 | ||
10d6c8cd DJ |
3333 | linux_ops = t; |
3334 | return t; | |
3335 | } | |
3336 | ||
d6b0e80f AC |
3337 | void |
3338 | _initialize_linux_nat (void) | |
3339 | { | |
3340 | struct sigaction action; | |
d6b0e80f | 3341 | extern void thread_db_init (struct target_ops *); |
dba24537 | 3342 | |
1bedd215 AC |
3343 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
3344 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
3345 | Specify any process id, or use the program being debugged by default.\n\ |
3346 | Specify any of the following keywords for detailed info:\n\ | |
3347 | mappings -- list of mapped memory regions.\n\ | |
3348 | stat -- list a bunch of random process info.\n\ | |
3349 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 3350 | all -- list all available /proc info.")); |
d6b0e80f AC |
3351 | |
3352 | init_linux_nat_ops (); | |
3353 | add_target (&linux_nat_ops); | |
3354 | thread_db_init (&linux_nat_ops); | |
3355 | ||
3356 | /* Save the original signal mask. */ | |
3357 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); | |
3358 | ||
3359 | action.sa_handler = sigchld_handler; | |
3360 | sigemptyset (&action.sa_mask); | |
58aecb61 | 3361 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
3362 | sigaction (SIGCHLD, &action, NULL); |
3363 | ||
3364 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
3365 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
3366 | sigdelset (&suspend_mask, SIGCHLD); | |
3367 | ||
3368 | sigemptyset (&blocked_mask); | |
3369 | ||
85c07804 AC |
3370 | add_setshow_zinteger_cmd ("lin-lwp", no_class, &debug_linux_nat, _("\ |
3371 | Set debugging of GNU/Linux lwp module."), _("\ | |
3372 | Show debugging of GNU/Linux lwp module."), _("\ | |
3373 | Enables printf debugging output."), | |
3374 | NULL, | |
920d2a44 | 3375 | show_debug_linux_nat, |
85c07804 | 3376 | &setdebuglist, &showdebuglist); |
d6b0e80f AC |
3377 | } |
3378 | \f | |
3379 | ||
3380 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
3381 | the GNU/Linux Threads library and therefore doesn't really belong | |
3382 | here. */ | |
3383 | ||
3384 | /* Read variable NAME in the target and return its value if found. | |
3385 | Otherwise return zero. It is assumed that the type of the variable | |
3386 | is `int'. */ | |
3387 | ||
3388 | static int | |
3389 | get_signo (const char *name) | |
3390 | { | |
3391 | struct minimal_symbol *ms; | |
3392 | int signo; | |
3393 | ||
3394 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
3395 | if (ms == NULL) | |
3396 | return 0; | |
3397 | ||
8e70166d | 3398 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
3399 | sizeof (signo)) != 0) |
3400 | return 0; | |
3401 | ||
3402 | return signo; | |
3403 | } | |
3404 | ||
3405 | /* Return the set of signals used by the threads library in *SET. */ | |
3406 | ||
3407 | void | |
3408 | lin_thread_get_thread_signals (sigset_t *set) | |
3409 | { | |
3410 | struct sigaction action; | |
3411 | int restart, cancel; | |
3412 | ||
3413 | sigemptyset (set); | |
3414 | ||
3415 | restart = get_signo ("__pthread_sig_restart"); | |
3416 | if (restart == 0) | |
3417 | return; | |
3418 | ||
3419 | cancel = get_signo ("__pthread_sig_cancel"); | |
3420 | if (cancel == 0) | |
3421 | return; | |
3422 | ||
3423 | sigaddset (set, restart); | |
3424 | sigaddset (set, cancel); | |
3425 | ||
3426 | /* The GNU/Linux Threads library makes terminating threads send a | |
3427 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
3428 | those (to prevent them from terminating GDB itself, which is | |
3429 | likely to be their default action) and treat them the same way as | |
3430 | SIGCHLD. */ | |
3431 | ||
3432 | action.sa_handler = sigchld_handler; | |
3433 | sigemptyset (&action.sa_mask); | |
58aecb61 | 3434 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
3435 | sigaction (cancel, &action, NULL); |
3436 | ||
3437 | /* We block the "cancel" signal throughout this code ... */ | |
3438 | sigaddset (&blocked_mask, cancel); | |
3439 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
3440 | ||
3441 | /* ... except during a sigsuspend. */ | |
3442 | sigdelset (&suspend_mask, cancel); | |
3443 | } | |
ac264b3b | 3444 |