Commit | Line | Data |
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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
197e01b6 | 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. |
3993f6b1 DJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
3993f6b1 DJ |
21 | |
22 | #include "defs.h" | |
23 | #include "inferior.h" | |
24 | #include "target.h" | |
d6b0e80f | 25 | #include "gdb_string.h" |
3993f6b1 | 26 | #include "gdb_wait.h" |
d6b0e80f AC |
27 | #include "gdb_assert.h" |
28 | #ifdef HAVE_TKILL_SYSCALL | |
29 | #include <unistd.h> | |
30 | #include <sys/syscall.h> | |
31 | #endif | |
3993f6b1 | 32 | #include <sys/ptrace.h> |
0274a8ce | 33 | #include "linux-nat.h" |
ac264b3b | 34 | #include "linux-fork.h" |
d6b0e80f AC |
35 | #include "gdbthread.h" |
36 | #include "gdbcmd.h" | |
37 | #include "regcache.h" | |
10d6c8cd DJ |
38 | #include "inf-ptrace.h" |
39 | #include "auxv.h" | |
dba24537 AC |
40 | #include <sys/param.h> /* for MAXPATHLEN */ |
41 | #include <sys/procfs.h> /* for elf_gregset etc. */ | |
42 | #include "elf-bfd.h" /* for elfcore_write_* */ | |
43 | #include "gregset.h" /* for gregset */ | |
44 | #include "gdbcore.h" /* for get_exec_file */ | |
45 | #include <ctype.h> /* for isdigit */ | |
46 | #include "gdbthread.h" /* for struct thread_info etc. */ | |
47 | #include "gdb_stat.h" /* for struct stat */ | |
48 | #include <fcntl.h> /* for O_RDONLY */ | |
49 | ||
50 | #ifndef O_LARGEFILE | |
51 | #define O_LARGEFILE 0 | |
52 | #endif | |
0274a8ce | 53 | |
3993f6b1 DJ |
54 | /* If the system headers did not provide the constants, hard-code the normal |
55 | values. */ | |
56 | #ifndef PTRACE_EVENT_FORK | |
57 | ||
58 | #define PTRACE_SETOPTIONS 0x4200 | |
59 | #define PTRACE_GETEVENTMSG 0x4201 | |
60 | ||
61 | /* options set using PTRACE_SETOPTIONS */ | |
62 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
63 | #define PTRACE_O_TRACEFORK 0x00000002 | |
64 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
65 | #define PTRACE_O_TRACECLONE 0x00000008 | |
66 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
9016a515 DJ |
67 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
68 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
3993f6b1 DJ |
69 | |
70 | /* Wait extended result codes for the above trace options. */ | |
71 | #define PTRACE_EVENT_FORK 1 | |
72 | #define PTRACE_EVENT_VFORK 2 | |
73 | #define PTRACE_EVENT_CLONE 3 | |
74 | #define PTRACE_EVENT_EXEC 4 | |
c874c7fc | 75 | #define PTRACE_EVENT_VFORK_DONE 5 |
9016a515 | 76 | #define PTRACE_EVENT_EXIT 6 |
3993f6b1 DJ |
77 | |
78 | #endif /* PTRACE_EVENT_FORK */ | |
79 | ||
80 | /* We can't always assume that this flag is available, but all systems | |
81 | with the ptrace event handlers also have __WALL, so it's safe to use | |
82 | here. */ | |
83 | #ifndef __WALL | |
84 | #define __WALL 0x40000000 /* Wait for any child. */ | |
85 | #endif | |
86 | ||
10d6c8cd DJ |
87 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
88 | the use of the multi-threaded target. */ | |
89 | static struct target_ops *linux_ops; | |
90 | ||
ac264b3b MS |
91 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
92 | Called by our to_xfer_partial. */ | |
93 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
94 | enum target_object, | |
95 | const char *, gdb_byte *, | |
96 | const gdb_byte *, | |
10d6c8cd DJ |
97 | ULONGEST, LONGEST); |
98 | ||
ac264b3b MS |
99 | /* The saved to_mourn_inferior method, inherited from inf-ptrace.c. |
100 | Called by our to_mourn_inferior. */ | |
101 | static void (*super_mourn_inferior) (void); | |
102 | ||
d6b0e80f | 103 | static int debug_linux_nat; |
920d2a44 AC |
104 | static void |
105 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
106 | struct cmd_list_element *c, const char *value) | |
107 | { | |
108 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
109 | value); | |
110 | } | |
d6b0e80f | 111 | |
9016a515 DJ |
112 | static int linux_parent_pid; |
113 | ||
ae087d01 DJ |
114 | struct simple_pid_list |
115 | { | |
116 | int pid; | |
117 | struct simple_pid_list *next; | |
118 | }; | |
119 | struct simple_pid_list *stopped_pids; | |
120 | ||
3993f6b1 DJ |
121 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
122 | can not be used, 1 if it can. */ | |
123 | ||
124 | static int linux_supports_tracefork_flag = -1; | |
125 | ||
9016a515 DJ |
126 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
127 | PTRACE_O_TRACEVFORKDONE. */ | |
128 | ||
129 | static int linux_supports_tracevforkdone_flag = -1; | |
130 | ||
ae087d01 DJ |
131 | \f |
132 | /* Trivial list manipulation functions to keep track of a list of | |
133 | new stopped processes. */ | |
134 | static void | |
135 | add_to_pid_list (struct simple_pid_list **listp, int pid) | |
136 | { | |
137 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
138 | new_pid->pid = pid; | |
139 | new_pid->next = *listp; | |
140 | *listp = new_pid; | |
141 | } | |
142 | ||
143 | static int | |
144 | pull_pid_from_list (struct simple_pid_list **listp, int pid) | |
145 | { | |
146 | struct simple_pid_list **p; | |
147 | ||
148 | for (p = listp; *p != NULL; p = &(*p)->next) | |
149 | if ((*p)->pid == pid) | |
150 | { | |
151 | struct simple_pid_list *next = (*p)->next; | |
152 | xfree (*p); | |
153 | *p = next; | |
154 | return 1; | |
155 | } | |
156 | return 0; | |
157 | } | |
158 | ||
159 | void | |
160 | linux_record_stopped_pid (int pid) | |
161 | { | |
162 | add_to_pid_list (&stopped_pids, pid); | |
163 | } | |
164 | ||
3993f6b1 DJ |
165 | \f |
166 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
167 | ||
168 | static void | |
169 | linux_tracefork_child (void) | |
170 | { | |
171 | int ret; | |
172 | ||
173 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
174 | kill (getpid (), SIGSTOP); | |
175 | fork (); | |
48bb3cce | 176 | _exit (0); |
3993f6b1 DJ |
177 | } |
178 | ||
b957e937 DJ |
179 | /* Wrapper function for waitpid which handles EINTR. */ |
180 | ||
181 | static int | |
182 | my_waitpid (int pid, int *status, int flags) | |
183 | { | |
184 | int ret; | |
185 | do | |
186 | { | |
187 | ret = waitpid (pid, status, flags); | |
188 | } | |
189 | while (ret == -1 && errno == EINTR); | |
190 | ||
191 | return ret; | |
192 | } | |
193 | ||
194 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
195 | ||
196 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
197 | we know that the feature is not available. This may change the tracing | |
198 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
199 | ||
200 | However, if it succeeds, we don't know for sure that the feature is | |
201 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 202 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
203 | fork tracing, and let it fork. If the process exits, we assume that we |
204 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
205 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
206 | |
207 | static void | |
b957e937 | 208 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
209 | { |
210 | int child_pid, ret, status; | |
211 | long second_pid; | |
212 | ||
b957e937 DJ |
213 | linux_supports_tracefork_flag = 0; |
214 | linux_supports_tracevforkdone_flag = 0; | |
215 | ||
216 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
217 | if (ret != 0) | |
218 | return; | |
219 | ||
3993f6b1 DJ |
220 | child_pid = fork (); |
221 | if (child_pid == -1) | |
e2e0b3e5 | 222 | perror_with_name (("fork")); |
3993f6b1 DJ |
223 | |
224 | if (child_pid == 0) | |
225 | linux_tracefork_child (); | |
226 | ||
b957e937 | 227 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 228 | if (ret == -1) |
e2e0b3e5 | 229 | perror_with_name (("waitpid")); |
3993f6b1 | 230 | else if (ret != child_pid) |
8a3fe4f8 | 231 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 232 | if (! WIFSTOPPED (status)) |
8a3fe4f8 | 233 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status); |
3993f6b1 | 234 | |
3993f6b1 DJ |
235 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
236 | if (ret != 0) | |
237 | { | |
b957e937 DJ |
238 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
239 | if (ret != 0) | |
240 | { | |
8a3fe4f8 | 241 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 DJ |
242 | return; |
243 | } | |
244 | ||
245 | ret = my_waitpid (child_pid, &status, 0); | |
246 | if (ret != child_pid) | |
8a3fe4f8 | 247 | warning (_("linux_test_for_tracefork: failed to wait for killed child")); |
b957e937 | 248 | else if (!WIFSIGNALED (status)) |
8a3fe4f8 AC |
249 | warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from " |
250 | "killed child"), status); | |
b957e937 | 251 | |
3993f6b1 DJ |
252 | return; |
253 | } | |
254 | ||
9016a515 DJ |
255 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
256 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
257 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
258 | linux_supports_tracevforkdone_flag = (ret == 0); | |
259 | ||
b957e937 DJ |
260 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
261 | if (ret != 0) | |
8a3fe4f8 | 262 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
263 | |
264 | ret = my_waitpid (child_pid, &status, 0); | |
265 | ||
3993f6b1 DJ |
266 | if (ret == child_pid && WIFSTOPPED (status) |
267 | && status >> 16 == PTRACE_EVENT_FORK) | |
268 | { | |
269 | second_pid = 0; | |
270 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
271 | if (ret == 0 && second_pid != 0) | |
272 | { | |
273 | int second_status; | |
274 | ||
275 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
276 | my_waitpid (second_pid, &second_status, 0); |
277 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
278 | if (ret != 0) | |
8a3fe4f8 | 279 | warning (_("linux_test_for_tracefork: failed to kill second child")); |
3993f6b1 DJ |
280 | } |
281 | } | |
b957e937 | 282 | else |
8a3fe4f8 AC |
283 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
284 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 285 | |
b957e937 DJ |
286 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
287 | if (ret != 0) | |
8a3fe4f8 | 288 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 289 | my_waitpid (child_pid, &status, 0); |
3993f6b1 DJ |
290 | } |
291 | ||
292 | /* Return non-zero iff we have tracefork functionality available. | |
293 | This function also sets linux_supports_tracefork_flag. */ | |
294 | ||
295 | static int | |
b957e937 | 296 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
297 | { |
298 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 299 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
300 | return linux_supports_tracefork_flag; |
301 | } | |
302 | ||
9016a515 | 303 | static int |
b957e937 | 304 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
305 | { |
306 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 307 | linux_test_for_tracefork (pid); |
9016a515 DJ |
308 | return linux_supports_tracevforkdone_flag; |
309 | } | |
310 | ||
3993f6b1 | 311 | \f |
4de4c07c DJ |
312 | void |
313 | linux_enable_event_reporting (ptid_t ptid) | |
314 | { | |
d3587048 | 315 | int pid = ptid_get_lwp (ptid); |
4de4c07c DJ |
316 | int options; |
317 | ||
d3587048 DJ |
318 | if (pid == 0) |
319 | pid = ptid_get_pid (ptid); | |
320 | ||
b957e937 | 321 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
322 | return; |
323 | ||
a2f23071 DJ |
324 | options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC |
325 | | PTRACE_O_TRACECLONE; | |
b957e937 | 326 | if (linux_supports_tracevforkdone (pid)) |
9016a515 DJ |
327 | options |= PTRACE_O_TRACEVFORKDONE; |
328 | ||
329 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
330 | read-only process state. */ | |
4de4c07c DJ |
331 | |
332 | ptrace (PTRACE_SETOPTIONS, pid, 0, options); | |
333 | } | |
334 | ||
335 | void | |
336 | child_post_attach (int pid) | |
337 | { | |
338 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
339 | } | |
340 | ||
10d6c8cd | 341 | static void |
4de4c07c DJ |
342 | linux_child_post_startup_inferior (ptid_t ptid) |
343 | { | |
344 | linux_enable_event_reporting (ptid); | |
345 | } | |
346 | ||
3993f6b1 | 347 | int |
ee057212 | 348 | child_follow_fork (struct target_ops *ops, int follow_child) |
3993f6b1 | 349 | { |
4de4c07c DJ |
350 | ptid_t last_ptid; |
351 | struct target_waitstatus last_status; | |
9016a515 | 352 | int has_vforked; |
4de4c07c DJ |
353 | int parent_pid, child_pid; |
354 | ||
355 | get_last_target_status (&last_ptid, &last_status); | |
9016a515 | 356 | has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); |
d3587048 DJ |
357 | parent_pid = ptid_get_lwp (last_ptid); |
358 | if (parent_pid == 0) | |
359 | parent_pid = ptid_get_pid (last_ptid); | |
4de4c07c DJ |
360 | child_pid = last_status.value.related_pid; |
361 | ||
362 | if (! follow_child) | |
363 | { | |
364 | /* We're already attached to the parent, by default. */ | |
365 | ||
366 | /* Before detaching from the child, remove all breakpoints from | |
367 | it. (This won't actually modify the breakpoint list, but will | |
368 | physically remove the breakpoints from the child.) */ | |
9016a515 DJ |
369 | /* If we vforked this will remove the breakpoints from the parent |
370 | also, but they'll be reinserted below. */ | |
4de4c07c DJ |
371 | detach_breakpoints (child_pid); |
372 | ||
ac264b3b MS |
373 | /* Detach new forked process? */ |
374 | if (detach_fork) | |
f75c00e4 | 375 | { |
ac264b3b MS |
376 | if (debug_linux_nat) |
377 | { | |
378 | target_terminal_ours (); | |
379 | fprintf_filtered (gdb_stdlog, | |
380 | "Detaching after fork from child process %d.\n", | |
381 | child_pid); | |
382 | } | |
4de4c07c | 383 | |
ac264b3b MS |
384 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
385 | } | |
386 | else | |
387 | { | |
388 | struct fork_info *fp; | |
389 | /* Retain child fork in ptrace (stopped) state. */ | |
390 | fp = find_fork_pid (child_pid); | |
391 | if (!fp) | |
392 | fp = add_fork (child_pid); | |
393 | fork_save_infrun_state (fp, 0); | |
394 | } | |
9016a515 DJ |
395 | |
396 | if (has_vforked) | |
397 | { | |
b957e937 DJ |
398 | gdb_assert (linux_supports_tracefork_flag >= 0); |
399 | if (linux_supports_tracevforkdone (0)) | |
9016a515 DJ |
400 | { |
401 | int status; | |
402 | ||
403 | ptrace (PTRACE_CONT, parent_pid, 0, 0); | |
58aecb61 | 404 | my_waitpid (parent_pid, &status, __WALL); |
c874c7fc | 405 | if ((status >> 16) != PTRACE_EVENT_VFORK_DONE) |
8a3fe4f8 AC |
406 | warning (_("Unexpected waitpid result %06x when waiting for " |
407 | "vfork-done"), status); | |
9016a515 DJ |
408 | } |
409 | else | |
410 | { | |
411 | /* We can't insert breakpoints until the child has | |
412 | finished with the shared memory region. We need to | |
413 | wait until that happens. Ideal would be to just | |
414 | call: | |
415 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
416 | - waitpid (parent_pid, &status, __WALL); | |
417 | However, most architectures can't handle a syscall | |
418 | being traced on the way out if it wasn't traced on | |
419 | the way in. | |
420 | ||
421 | We might also think to loop, continuing the child | |
422 | until it exits or gets a SIGTRAP. One problem is | |
423 | that the child might call ptrace with PTRACE_TRACEME. | |
424 | ||
425 | There's no simple and reliable way to figure out when | |
426 | the vforked child will be done with its copy of the | |
427 | shared memory. We could step it out of the syscall, | |
428 | two instructions, let it go, and then single-step the | |
429 | parent once. When we have hardware single-step, this | |
430 | would work; with software single-step it could still | |
431 | be made to work but we'd have to be able to insert | |
432 | single-step breakpoints in the child, and we'd have | |
433 | to insert -just- the single-step breakpoint in the | |
434 | parent. Very awkward. | |
435 | ||
436 | In the end, the best we can do is to make sure it | |
437 | runs for a little while. Hopefully it will be out of | |
438 | range of any breakpoints we reinsert. Usually this | |
439 | is only the single-step breakpoint at vfork's return | |
440 | point. */ | |
441 | ||
442 | usleep (10000); | |
443 | } | |
444 | ||
445 | /* Since we vforked, breakpoints were removed in the parent | |
446 | too. Put them back. */ | |
447 | reattach_breakpoints (parent_pid); | |
448 | } | |
4de4c07c | 449 | } |
3993f6b1 | 450 | else |
4de4c07c DJ |
451 | { |
452 | char child_pid_spelling[40]; | |
453 | ||
454 | /* Needed to keep the breakpoint lists in sync. */ | |
9016a515 DJ |
455 | if (! has_vforked) |
456 | detach_breakpoints (child_pid); | |
4de4c07c DJ |
457 | |
458 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
459 | remove_breakpoints (); | |
460 | ||
f75c00e4 DJ |
461 | if (debug_linux_nat) |
462 | { | |
463 | target_terminal_ours (); | |
ac264b3b MS |
464 | fprintf_filtered (gdb_stdlog, |
465 | "Attaching after fork to child process %d.\n", | |
466 | child_pid); | |
f75c00e4 | 467 | } |
4de4c07c | 468 | |
9016a515 DJ |
469 | /* If we're vforking, we may want to hold on to the parent until |
470 | the child exits or execs. At exec time we can remove the old | |
471 | breakpoints from the parent and detach it; at exit time we | |
472 | could do the same (or even, sneakily, resume debugging it - the | |
473 | child's exec has failed, or something similar). | |
474 | ||
475 | This doesn't clean up "properly", because we can't call | |
476 | target_detach, but that's OK; if the current target is "child", | |
477 | then it doesn't need any further cleanups, and lin_lwp will | |
478 | generally not encounter vfork (vfork is defined to fork | |
479 | in libpthread.so). | |
480 | ||
481 | The holding part is very easy if we have VFORKDONE events; | |
482 | but keeping track of both processes is beyond GDB at the | |
483 | moment. So we don't expose the parent to the rest of GDB. | |
484 | Instead we quietly hold onto it until such time as we can | |
485 | safely resume it. */ | |
486 | ||
487 | if (has_vforked) | |
488 | linux_parent_pid = parent_pid; | |
ac264b3b MS |
489 | else if (!detach_fork) |
490 | { | |
491 | struct fork_info *fp; | |
492 | /* Retain parent fork in ptrace (stopped) state. */ | |
493 | fp = find_fork_pid (parent_pid); | |
494 | if (!fp) | |
495 | fp = add_fork (parent_pid); | |
496 | fork_save_infrun_state (fp, 0); | |
497 | } | |
9016a515 | 498 | else |
ac264b3b MS |
499 | { |
500 | target_detach (NULL, 0); | |
501 | } | |
4de4c07c DJ |
502 | |
503 | inferior_ptid = pid_to_ptid (child_pid); | |
ee057212 DJ |
504 | |
505 | /* Reinstall ourselves, since we might have been removed in | |
506 | target_detach (which does other necessary cleanup). */ | |
ac264b3b | 507 | |
ee057212 | 508 | push_target (ops); |
4de4c07c DJ |
509 | |
510 | /* Reset breakpoints in the child as appropriate. */ | |
511 | follow_inferior_reset_breakpoints (); | |
512 | } | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | ptid_t | |
518 | linux_handle_extended_wait (int pid, int status, | |
519 | struct target_waitstatus *ourstatus) | |
520 | { | |
521 | int event = status >> 16; | |
522 | ||
a2f23071 DJ |
523 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
524 | || event == PTRACE_EVENT_CLONE) | |
4de4c07c DJ |
525 | { |
526 | unsigned long new_pid; | |
527 | int ret; | |
528 | ||
529 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
530 | ||
531 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
532 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
533 | { | |
534 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
a2f23071 | 535 | hits the SIGSTOP, but we're already attached. */ |
58aecb61 DJ |
536 | ret = my_waitpid (new_pid, &status, |
537 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
4de4c07c | 538 | if (ret == -1) |
e2e0b3e5 | 539 | perror_with_name (_("waiting for new child")); |
4de4c07c DJ |
540 | else if (ret != new_pid) |
541 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 542 | _("wait returned unexpected PID %d"), ret); |
4de4c07c DJ |
543 | else if (!WIFSTOPPED (status) || WSTOPSIG (status) != SIGSTOP) |
544 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 545 | _("wait returned unexpected status 0x%x"), status); |
4de4c07c DJ |
546 | } |
547 | ||
a2f23071 DJ |
548 | if (event == PTRACE_EVENT_FORK) |
549 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
550 | else if (event == PTRACE_EVENT_VFORK) | |
551 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
552 | else | |
553 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
554 | ||
4de4c07c DJ |
555 | ourstatus->value.related_pid = new_pid; |
556 | return inferior_ptid; | |
557 | } | |
558 | ||
9016a515 DJ |
559 | if (event == PTRACE_EVENT_EXEC) |
560 | { | |
561 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
562 | ourstatus->value.execd_pathname | |
563 | = xstrdup (child_pid_to_exec_file (pid)); | |
564 | ||
565 | if (linux_parent_pid) | |
566 | { | |
567 | detach_breakpoints (linux_parent_pid); | |
568 | ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0); | |
569 | ||
570 | linux_parent_pid = 0; | |
571 | } | |
572 | ||
573 | return inferior_ptid; | |
574 | } | |
575 | ||
4de4c07c | 576 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 577 | _("unknown ptrace event %d"), event); |
4de4c07c DJ |
578 | } |
579 | ||
580 | \f | |
fa113d1a | 581 | void |
4de4c07c DJ |
582 | child_insert_fork_catchpoint (int pid) |
583 | { | |
b957e937 | 584 | if (! linux_supports_tracefork (pid)) |
8a3fe4f8 | 585 | error (_("Your system does not support fork catchpoints.")); |
3993f6b1 DJ |
586 | } |
587 | ||
fa113d1a | 588 | void |
3993f6b1 DJ |
589 | child_insert_vfork_catchpoint (int pid) |
590 | { | |
b957e937 | 591 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 592 | error (_("Your system does not support vfork catchpoints.")); |
3993f6b1 DJ |
593 | } |
594 | ||
fa113d1a | 595 | void |
3993f6b1 DJ |
596 | child_insert_exec_catchpoint (int pid) |
597 | { | |
b957e937 | 598 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 599 | error (_("Your system does not support exec catchpoints.")); |
3993f6b1 DJ |
600 | } |
601 | ||
4de4c07c DJ |
602 | void |
603 | kill_inferior (void) | |
604 | { | |
605 | int status; | |
606 | int pid = PIDGET (inferior_ptid); | |
607 | struct target_waitstatus last; | |
608 | ptid_t last_ptid; | |
609 | int ret; | |
610 | ||
611 | if (pid == 0) | |
612 | return; | |
613 | ||
ac264b3b MS |
614 | /* First cut -- let's crudely do everything inline. */ |
615 | if (forks_exist_p ()) | |
4de4c07c | 616 | { |
ac264b3b MS |
617 | linux_fork_killall (); |
618 | pop_target (); | |
619 | generic_mourn_inferior (); | |
4de4c07c | 620 | } |
ac264b3b MS |
621 | else |
622 | { | |
623 | /* If we're stopped while forking and we haven't followed yet, | |
624 | kill the other task. We need to do this first because the | |
625 | parent will be sleeping if this is a vfork. */ | |
4de4c07c | 626 | |
ac264b3b | 627 | get_last_target_status (&last_ptid, &last); |
4de4c07c | 628 | |
ac264b3b MS |
629 | if (last.kind == TARGET_WAITKIND_FORKED |
630 | || last.kind == TARGET_WAITKIND_VFORKED) | |
631 | { | |
632 | ptrace (PT_KILL, last.value.related_pid, 0, 0); | |
633 | wait (&status); | |
634 | } | |
4de4c07c | 635 | |
ac264b3b | 636 | /* Kill the current process. */ |
de9a9e51 | 637 | ptrace (PT_KILL, pid, 0, 0); |
ee21b650 | 638 | ret = wait (&status); |
4de4c07c | 639 | |
ac264b3b MS |
640 | /* We might get a SIGCHLD instead of an exit status. This is |
641 | aggravated by the first kill above - a child has just died. */ | |
642 | ||
643 | while (ret == pid && WIFSTOPPED (status)) | |
644 | { | |
645 | ptrace (PT_KILL, pid, 0, 0); | |
646 | ret = wait (&status); | |
647 | } | |
648 | target_mourn_inferior (); | |
649 | } | |
4de4c07c | 650 | } |
d6b0e80f AC |
651 | |
652 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's | |
653 | are processes sharing the same VM space. A multi-threaded process | |
654 | is basically a group of such processes. However, such a grouping | |
655 | is almost entirely a user-space issue; the kernel doesn't enforce | |
656 | such a grouping at all (this might change in the future). In | |
657 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
658 | Threads library) to provide such a grouping. | |
659 | ||
660 | It is perfectly well possible to write a multi-threaded application | |
661 | without the assistance of a threads library, by using the clone | |
662 | system call directly. This module should be able to give some | |
663 | rudimentary support for debugging such applications if developers | |
664 | specify the CLONE_PTRACE flag in the clone system call, and are | |
665 | using the Linux kernel 2.4 or above. | |
666 | ||
667 | Note that there are some peculiarities in GNU/Linux that affect | |
668 | this code: | |
669 | ||
670 | - In general one should specify the __WCLONE flag to waitpid in | |
671 | order to make it report events for any of the cloned processes | |
672 | (and leave it out for the initial process). However, if a cloned | |
673 | process has exited the exit status is only reported if the | |
674 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
675 | we cannot use it since GDB must work on older systems too. | |
676 | ||
677 | - When a traced, cloned process exits and is waited for by the | |
678 | debugger, the kernel reassigns it to the original parent and | |
679 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
680 | library doesn't notice this, which leads to the "zombie problem": | |
681 | When debugged a multi-threaded process that spawns a lot of | |
682 | threads will run out of processes, even if the threads exit, | |
683 | because the "zombies" stay around. */ | |
684 | ||
685 | /* List of known LWPs. */ | |
686 | static struct lwp_info *lwp_list; | |
687 | ||
688 | /* Number of LWPs in the list. */ | |
689 | static int num_lwps; | |
690 | ||
691 | /* Non-zero if we're running in "threaded" mode. */ | |
692 | static int threaded; | |
693 | \f | |
694 | ||
695 | #define GET_LWP(ptid) ptid_get_lwp (ptid) | |
696 | #define GET_PID(ptid) ptid_get_pid (ptid) | |
697 | #define is_lwp(ptid) (GET_LWP (ptid) != 0) | |
698 | #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) | |
699 | ||
700 | /* If the last reported event was a SIGTRAP, this variable is set to | |
701 | the process id of the LWP/thread that got it. */ | |
702 | ptid_t trap_ptid; | |
703 | \f | |
704 | ||
705 | /* This module's target-specific operations. */ | |
706 | static struct target_ops linux_nat_ops; | |
707 | ||
d6b0e80f AC |
708 | /* Since we cannot wait (in linux_nat_wait) for the initial process and |
709 | any cloned processes with a single call to waitpid, we have to use | |
710 | the WNOHANG flag and call waitpid in a loop. To optimize | |
711 | things a bit we use `sigsuspend' to wake us up when a process has | |
712 | something to report (it will send us a SIGCHLD if it has). To make | |
713 | this work we have to juggle with the signal mask. We save the | |
714 | original signal mask such that we can restore it before creating a | |
715 | new process in order to avoid blocking certain signals in the | |
716 | inferior. We then block SIGCHLD during the waitpid/sigsuspend | |
717 | loop. */ | |
718 | ||
719 | /* Original signal mask. */ | |
720 | static sigset_t normal_mask; | |
721 | ||
722 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
723 | _initialize_linux_nat. */ | |
724 | static sigset_t suspend_mask; | |
725 | ||
726 | /* Signals to block to make that sigsuspend work. */ | |
727 | static sigset_t blocked_mask; | |
728 | \f | |
729 | ||
730 | /* Prototypes for local functions. */ | |
731 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
732 | static int linux_nat_thread_alive (ptid_t ptid); | |
733 | \f | |
734 | /* Convert wait status STATUS to a string. Used for printing debug | |
735 | messages only. */ | |
736 | ||
737 | static char * | |
738 | status_to_str (int status) | |
739 | { | |
740 | static char buf[64]; | |
741 | ||
742 | if (WIFSTOPPED (status)) | |
743 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
744 | strsignal (WSTOPSIG (status))); | |
745 | else if (WIFSIGNALED (status)) | |
746 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
747 | strsignal (WSTOPSIG (status))); | |
748 | else | |
749 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
750 | ||
751 | return buf; | |
752 | } | |
753 | ||
754 | /* Initialize the list of LWPs. Note that this module, contrary to | |
755 | what GDB's generic threads layer does for its thread list, | |
756 | re-initializes the LWP lists whenever we mourn or detach (which | |
757 | doesn't involve mourning) the inferior. */ | |
758 | ||
759 | static void | |
760 | init_lwp_list (void) | |
761 | { | |
762 | struct lwp_info *lp, *lpnext; | |
763 | ||
764 | for (lp = lwp_list; lp; lp = lpnext) | |
765 | { | |
766 | lpnext = lp->next; | |
767 | xfree (lp); | |
768 | } | |
769 | ||
770 | lwp_list = NULL; | |
771 | num_lwps = 0; | |
772 | threaded = 0; | |
773 | } | |
774 | ||
775 | /* Add the LWP specified by PID to the list. If this causes the | |
776 | number of LWPs to become larger than one, go into "threaded" mode. | |
777 | Return a pointer to the structure describing the new LWP. */ | |
778 | ||
779 | static struct lwp_info * | |
780 | add_lwp (ptid_t ptid) | |
781 | { | |
782 | struct lwp_info *lp; | |
783 | ||
784 | gdb_assert (is_lwp (ptid)); | |
785 | ||
786 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
787 | ||
788 | memset (lp, 0, sizeof (struct lwp_info)); | |
789 | ||
790 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
791 | ||
792 | lp->ptid = ptid; | |
793 | ||
794 | lp->next = lwp_list; | |
795 | lwp_list = lp; | |
796 | if (++num_lwps > 1) | |
797 | threaded = 1; | |
798 | ||
799 | return lp; | |
800 | } | |
801 | ||
802 | /* Remove the LWP specified by PID from the list. */ | |
803 | ||
804 | static void | |
805 | delete_lwp (ptid_t ptid) | |
806 | { | |
807 | struct lwp_info *lp, *lpprev; | |
808 | ||
809 | lpprev = NULL; | |
810 | ||
811 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
812 | if (ptid_equal (lp->ptid, ptid)) | |
813 | break; | |
814 | ||
815 | if (!lp) | |
816 | return; | |
817 | ||
818 | /* We don't go back to "non-threaded" mode if the number of threads | |
819 | becomes less than two. */ | |
820 | num_lwps--; | |
821 | ||
822 | if (lpprev) | |
823 | lpprev->next = lp->next; | |
824 | else | |
825 | lwp_list = lp->next; | |
826 | ||
827 | xfree (lp); | |
828 | } | |
829 | ||
830 | /* Return a pointer to the structure describing the LWP corresponding | |
831 | to PID. If no corresponding LWP could be found, return NULL. */ | |
832 | ||
833 | static struct lwp_info * | |
834 | find_lwp_pid (ptid_t ptid) | |
835 | { | |
836 | struct lwp_info *lp; | |
837 | int lwp; | |
838 | ||
839 | if (is_lwp (ptid)) | |
840 | lwp = GET_LWP (ptid); | |
841 | else | |
842 | lwp = GET_PID (ptid); | |
843 | ||
844 | for (lp = lwp_list; lp; lp = lp->next) | |
845 | if (lwp == GET_LWP (lp->ptid)) | |
846 | return lp; | |
847 | ||
848 | return NULL; | |
849 | } | |
850 | ||
851 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
852 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
853 | pointer to the structure describing that LWP immediately. | |
854 | Otherwise return NULL. */ | |
855 | ||
856 | struct lwp_info * | |
857 | iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data) | |
858 | { | |
859 | struct lwp_info *lp, *lpnext; | |
860 | ||
861 | for (lp = lwp_list; lp; lp = lpnext) | |
862 | { | |
863 | lpnext = lp->next; | |
864 | if ((*callback) (lp, data)) | |
865 | return lp; | |
866 | } | |
867 | ||
868 | return NULL; | |
869 | } | |
870 | ||
871 | /* Attach to the LWP specified by PID. If VERBOSE is non-zero, print | |
872 | a message telling the user that a new LWP has been added to the | |
873 | process. */ | |
874 | ||
875 | void | |
876 | lin_lwp_attach_lwp (ptid_t ptid, int verbose) | |
877 | { | |
878 | struct lwp_info *lp, *found_lp; | |
879 | ||
880 | gdb_assert (is_lwp (ptid)); | |
881 | ||
882 | /* Make sure SIGCHLD is blocked. We don't want SIGCHLD events | |
883 | to interrupt either the ptrace() or waitpid() calls below. */ | |
884 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
885 | { | |
886 | sigaddset (&blocked_mask, SIGCHLD); | |
887 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
888 | } | |
889 | ||
890 | if (verbose) | |
a3f17187 | 891 | printf_filtered (_("[New %s]\n"), target_pid_to_str (ptid)); |
d6b0e80f AC |
892 | |
893 | found_lp = lp = find_lwp_pid (ptid); | |
894 | if (lp == NULL) | |
895 | lp = add_lwp (ptid); | |
896 | ||
897 | /* We assume that we're already attached to any LWP that has an id | |
898 | equal to the overall process id, and to any LWP that is already | |
899 | in our list of LWPs. If we're not seeing exit events from threads | |
900 | and we've had PID wraparound since we last tried to stop all threads, | |
901 | this assumption might be wrong; fortunately, this is very unlikely | |
902 | to happen. */ | |
903 | if (GET_LWP (ptid) != GET_PID (ptid) && found_lp == NULL) | |
904 | { | |
905 | pid_t pid; | |
906 | int status; | |
907 | ||
908 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
8a3fe4f8 | 909 | error (_("Can't attach %s: %s"), target_pid_to_str (ptid), |
d6b0e80f AC |
910 | safe_strerror (errno)); |
911 | ||
912 | if (debug_linux_nat) | |
913 | fprintf_unfiltered (gdb_stdlog, | |
914 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
915 | target_pid_to_str (ptid)); | |
916 | ||
58aecb61 | 917 | pid = my_waitpid (GET_LWP (ptid), &status, 0); |
d6b0e80f AC |
918 | if (pid == -1 && errno == ECHILD) |
919 | { | |
920 | /* Try again with __WCLONE to check cloned processes. */ | |
58aecb61 | 921 | pid = my_waitpid (GET_LWP (ptid), &status, __WCLONE); |
d6b0e80f AC |
922 | lp->cloned = 1; |
923 | } | |
924 | ||
925 | gdb_assert (pid == GET_LWP (ptid) | |
926 | && WIFSTOPPED (status) && WSTOPSIG (status)); | |
927 | ||
928 | child_post_attach (pid); | |
929 | ||
930 | lp->stopped = 1; | |
931 | ||
932 | if (debug_linux_nat) | |
933 | { | |
934 | fprintf_unfiltered (gdb_stdlog, | |
935 | "LLAL: waitpid %s received %s\n", | |
936 | target_pid_to_str (ptid), | |
937 | status_to_str (status)); | |
938 | } | |
939 | } | |
940 | else | |
941 | { | |
942 | /* We assume that the LWP representing the original process is | |
943 | already stopped. Mark it as stopped in the data structure | |
944 | that the linux ptrace layer uses to keep track of threads. | |
945 | Note that this won't have already been done since the main | |
946 | thread will have, we assume, been stopped by an attach from a | |
947 | different layer. */ | |
948 | lp->stopped = 1; | |
949 | } | |
950 | } | |
951 | ||
952 | static void | |
953 | linux_nat_attach (char *args, int from_tty) | |
954 | { | |
955 | struct lwp_info *lp; | |
956 | pid_t pid; | |
957 | int status; | |
958 | ||
959 | /* FIXME: We should probably accept a list of process id's, and | |
960 | attach all of them. */ | |
10d6c8cd | 961 | linux_ops->to_attach (args, from_tty); |
d6b0e80f AC |
962 | |
963 | /* Add the initial process as the first LWP to the list. */ | |
964 | lp = add_lwp (BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid))); | |
965 | ||
966 | /* Make sure the initial process is stopped. The user-level threads | |
967 | layer might want to poke around in the inferior, and that won't | |
968 | work if things haven't stabilized yet. */ | |
58aecb61 | 969 | pid = my_waitpid (GET_PID (inferior_ptid), &status, 0); |
d6b0e80f AC |
970 | if (pid == -1 && errno == ECHILD) |
971 | { | |
8a3fe4f8 | 972 | warning (_("%s is a cloned process"), target_pid_to_str (inferior_ptid)); |
d6b0e80f AC |
973 | |
974 | /* Try again with __WCLONE to check cloned processes. */ | |
58aecb61 | 975 | pid = my_waitpid (GET_PID (inferior_ptid), &status, __WCLONE); |
d6b0e80f AC |
976 | lp->cloned = 1; |
977 | } | |
978 | ||
979 | gdb_assert (pid == GET_PID (inferior_ptid) | |
980 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP); | |
981 | ||
982 | lp->stopped = 1; | |
983 | ||
984 | /* Fake the SIGSTOP that core GDB expects. */ | |
985 | lp->status = W_STOPCODE (SIGSTOP); | |
986 | lp->resumed = 1; | |
987 | if (debug_linux_nat) | |
988 | { | |
989 | fprintf_unfiltered (gdb_stdlog, | |
990 | "LLA: waitpid %ld, faking SIGSTOP\n", (long) pid); | |
991 | } | |
992 | } | |
993 | ||
994 | static int | |
995 | detach_callback (struct lwp_info *lp, void *data) | |
996 | { | |
997 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
998 | ||
999 | if (debug_linux_nat && lp->status) | |
1000 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1001 | strsignal (WSTOPSIG (lp->status)), | |
1002 | target_pid_to_str (lp->ptid)); | |
1003 | ||
1004 | while (lp->signalled && lp->stopped) | |
1005 | { | |
1006 | errno = 0; | |
1007 | if (ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, | |
1008 | WSTOPSIG (lp->status)) < 0) | |
8a3fe4f8 | 1009 | error (_("Can't continue %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1010 | safe_strerror (errno)); |
1011 | ||
1012 | if (debug_linux_nat) | |
1013 | fprintf_unfiltered (gdb_stdlog, | |
1014 | "DC: PTRACE_CONTINUE (%s, 0, %s) (OK)\n", | |
1015 | target_pid_to_str (lp->ptid), | |
1016 | status_to_str (lp->status)); | |
1017 | ||
1018 | lp->stopped = 0; | |
1019 | lp->signalled = 0; | |
1020 | lp->status = 0; | |
1021 | /* FIXME drow/2003-08-26: There was a call to stop_wait_callback | |
1022 | here. But since lp->signalled was cleared above, | |
1023 | stop_wait_callback didn't do anything; the process was left | |
1024 | running. Shouldn't we be waiting for it to stop? | |
1025 | I've removed the call, since stop_wait_callback now does do | |
1026 | something when called with lp->signalled == 0. */ | |
1027 | ||
1028 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1029 | } | |
1030 | ||
1031 | /* We don't actually detach from the LWP that has an id equal to the | |
1032 | overall process id just yet. */ | |
1033 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1034 | { | |
1035 | errno = 0; | |
1036 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
1037 | WSTOPSIG (lp->status)) < 0) | |
8a3fe4f8 | 1038 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1039 | safe_strerror (errno)); |
1040 | ||
1041 | if (debug_linux_nat) | |
1042 | fprintf_unfiltered (gdb_stdlog, | |
1043 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1044 | target_pid_to_str (lp->ptid), | |
1045 | strsignal (WSTOPSIG (lp->status))); | |
1046 | ||
1047 | delete_lwp (lp->ptid); | |
1048 | } | |
1049 | ||
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | static void | |
1054 | linux_nat_detach (char *args, int from_tty) | |
1055 | { | |
1056 | iterate_over_lwps (detach_callback, NULL); | |
1057 | ||
1058 | /* Only the initial process should be left right now. */ | |
1059 | gdb_assert (num_lwps == 1); | |
1060 | ||
1061 | trap_ptid = null_ptid; | |
1062 | ||
1063 | /* Destroy LWP info; it's no longer valid. */ | |
1064 | init_lwp_list (); | |
1065 | ||
1066 | /* Restore the original signal mask. */ | |
1067 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); | |
1068 | sigemptyset (&blocked_mask); | |
1069 | ||
1070 | inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid)); | |
10d6c8cd | 1071 | linux_ops->to_detach (args, from_tty); |
d6b0e80f AC |
1072 | } |
1073 | ||
1074 | /* Resume LP. */ | |
1075 | ||
1076 | static int | |
1077 | resume_callback (struct lwp_info *lp, void *data) | |
1078 | { | |
1079 | if (lp->stopped && lp->status == 0) | |
1080 | { | |
1081 | struct thread_info *tp; | |
1082 | ||
10d6c8cd DJ |
1083 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
1084 | 0, TARGET_SIGNAL_0); | |
d6b0e80f AC |
1085 | if (debug_linux_nat) |
1086 | fprintf_unfiltered (gdb_stdlog, | |
1087 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1088 | target_pid_to_str (lp->ptid)); | |
1089 | lp->stopped = 0; | |
1090 | lp->step = 0; | |
1091 | } | |
1092 | ||
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | static int | |
1097 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1098 | { | |
1099 | lp->resumed = 0; | |
1100 | return 0; | |
1101 | } | |
1102 | ||
1103 | static int | |
1104 | resume_set_callback (struct lwp_info *lp, void *data) | |
1105 | { | |
1106 | lp->resumed = 1; | |
1107 | return 0; | |
1108 | } | |
1109 | ||
1110 | static void | |
1111 | linux_nat_resume (ptid_t ptid, int step, enum target_signal signo) | |
1112 | { | |
1113 | struct lwp_info *lp; | |
1114 | int resume_all; | |
1115 | ||
76f50ad1 DJ |
1116 | if (debug_linux_nat) |
1117 | fprintf_unfiltered (gdb_stdlog, | |
1118 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1119 | step ? "step" : "resume", | |
1120 | target_pid_to_str (ptid), | |
1121 | signo ? strsignal (signo) : "0", | |
1122 | target_pid_to_str (inferior_ptid)); | |
1123 | ||
d6b0e80f AC |
1124 | /* A specific PTID means `step only this process id'. */ |
1125 | resume_all = (PIDGET (ptid) == -1); | |
1126 | ||
1127 | if (resume_all) | |
1128 | iterate_over_lwps (resume_set_callback, NULL); | |
1129 | else | |
1130 | iterate_over_lwps (resume_clear_callback, NULL); | |
1131 | ||
1132 | /* If PID is -1, it's the current inferior that should be | |
1133 | handled specially. */ | |
1134 | if (PIDGET (ptid) == -1) | |
1135 | ptid = inferior_ptid; | |
1136 | ||
1137 | lp = find_lwp_pid (ptid); | |
1138 | if (lp) | |
1139 | { | |
1140 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
1141 | ||
1142 | /* Remember if we're stepping. */ | |
1143 | lp->step = step; | |
1144 | ||
1145 | /* Mark this LWP as resumed. */ | |
1146 | lp->resumed = 1; | |
1147 | ||
1148 | /* If we have a pending wait status for this thread, there is no | |
76f50ad1 DJ |
1149 | point in resuming the process. But first make sure that |
1150 | linux_nat_wait won't preemptively handle the event - we | |
1151 | should never take this short-circuit if we are going to | |
1152 | leave LP running, since we have skipped resuming all the | |
1153 | other threads. This bit of code needs to be synchronized | |
1154 | with linux_nat_wait. */ | |
1155 | ||
1156 | if (lp->status && WIFSTOPPED (lp->status)) | |
1157 | { | |
1158 | int saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1159 | ||
1160 | if (signal_stop_state (saved_signo) == 0 | |
1161 | && signal_print_state (saved_signo) == 0 | |
1162 | && signal_pass_state (saved_signo) == 1) | |
1163 | { | |
1164 | if (debug_linux_nat) | |
1165 | fprintf_unfiltered (gdb_stdlog, | |
1166 | "LLR: Not short circuiting for ignored " | |
1167 | "status 0x%x\n", lp->status); | |
1168 | ||
1169 | /* FIXME: What should we do if we are supposed to continue | |
1170 | this thread with a signal? */ | |
1171 | gdb_assert (signo == TARGET_SIGNAL_0); | |
1172 | signo = saved_signo; | |
1173 | lp->status = 0; | |
1174 | } | |
1175 | } | |
1176 | ||
d6b0e80f AC |
1177 | if (lp->status) |
1178 | { | |
1179 | /* FIXME: What should we do if we are supposed to continue | |
1180 | this thread with a signal? */ | |
1181 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 DJ |
1182 | |
1183 | if (debug_linux_nat) | |
1184 | fprintf_unfiltered (gdb_stdlog, | |
1185 | "LLR: Short circuiting for status 0x%x\n", | |
1186 | lp->status); | |
1187 | ||
d6b0e80f AC |
1188 | return; |
1189 | } | |
1190 | ||
1191 | /* Mark LWP as not stopped to prevent it from being continued by | |
1192 | resume_callback. */ | |
1193 | lp->stopped = 0; | |
1194 | } | |
1195 | ||
1196 | if (resume_all) | |
1197 | iterate_over_lwps (resume_callback, NULL); | |
1198 | ||
10d6c8cd | 1199 | linux_ops->to_resume (ptid, step, signo); |
d6b0e80f AC |
1200 | if (debug_linux_nat) |
1201 | fprintf_unfiltered (gdb_stdlog, | |
1202 | "LLR: %s %s, %s (resume event thread)\n", | |
1203 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1204 | target_pid_to_str (ptid), | |
1205 | signo ? strsignal (signo) : "0"); | |
1206 | } | |
1207 | ||
1208 | /* Issue kill to specified lwp. */ | |
1209 | ||
1210 | static int tkill_failed; | |
1211 | ||
1212 | static int | |
1213 | kill_lwp (int lwpid, int signo) | |
1214 | { | |
1215 | errno = 0; | |
1216 | ||
1217 | /* Use tkill, if possible, in case we are using nptl threads. If tkill | |
1218 | fails, then we are not using nptl threads and we should be using kill. */ | |
1219 | ||
1220 | #ifdef HAVE_TKILL_SYSCALL | |
1221 | if (!tkill_failed) | |
1222 | { | |
1223 | int ret = syscall (__NR_tkill, lwpid, signo); | |
1224 | if (errno != ENOSYS) | |
1225 | return ret; | |
1226 | errno = 0; | |
1227 | tkill_failed = 1; | |
1228 | } | |
1229 | #endif | |
1230 | ||
1231 | return kill (lwpid, signo); | |
1232 | } | |
1233 | ||
1234 | /* Handle a GNU/Linux extended wait response. Most of the work we | |
1235 | just pass off to linux_handle_extended_wait, but if it reports a | |
1236 | clone event we need to add the new LWP to our list (and not report | |
1237 | the trap to higher layers). This function returns non-zero if | |
1238 | the event should be ignored and we should wait again. */ | |
1239 | ||
1240 | static int | |
1241 | linux_nat_handle_extended (struct lwp_info *lp, int status) | |
1242 | { | |
1243 | linux_handle_extended_wait (GET_LWP (lp->ptid), status, | |
1244 | &lp->waitstatus); | |
1245 | ||
1246 | /* TARGET_WAITKIND_SPURIOUS is used to indicate clone events. */ | |
1247 | if (lp->waitstatus.kind == TARGET_WAITKIND_SPURIOUS) | |
1248 | { | |
1249 | struct lwp_info *new_lp; | |
1250 | new_lp = add_lwp (BUILD_LWP (lp->waitstatus.value.related_pid, | |
1251 | GET_PID (inferior_ptid))); | |
1252 | new_lp->cloned = 1; | |
1253 | new_lp->stopped = 1; | |
1254 | ||
1255 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1256 | ||
1257 | if (debug_linux_nat) | |
1258 | fprintf_unfiltered (gdb_stdlog, | |
1259 | "LLHE: Got clone event from LWP %ld, resuming\n", | |
1260 | GET_LWP (lp->ptid)); | |
1261 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1262 | ||
1263 | return 1; | |
1264 | } | |
1265 | ||
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
1270 | exited. */ | |
1271 | ||
1272 | static int | |
1273 | wait_lwp (struct lwp_info *lp) | |
1274 | { | |
1275 | pid_t pid; | |
1276 | int status; | |
1277 | int thread_dead = 0; | |
1278 | ||
1279 | gdb_assert (!lp->stopped); | |
1280 | gdb_assert (lp->status == 0); | |
1281 | ||
58aecb61 | 1282 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
1283 | if (pid == -1 && errno == ECHILD) |
1284 | { | |
58aecb61 | 1285 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
1286 | if (pid == -1 && errno == ECHILD) |
1287 | { | |
1288 | /* The thread has previously exited. We need to delete it | |
1289 | now because, for some vendor 2.4 kernels with NPTL | |
1290 | support backported, there won't be an exit event unless | |
1291 | it is the main thread. 2.6 kernels will report an exit | |
1292 | event for each thread that exits, as expected. */ | |
1293 | thread_dead = 1; | |
1294 | if (debug_linux_nat) | |
1295 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
1296 | target_pid_to_str (lp->ptid)); | |
1297 | } | |
1298 | } | |
1299 | ||
1300 | if (!thread_dead) | |
1301 | { | |
1302 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
1303 | ||
1304 | if (debug_linux_nat) | |
1305 | { | |
1306 | fprintf_unfiltered (gdb_stdlog, | |
1307 | "WL: waitpid %s received %s\n", | |
1308 | target_pid_to_str (lp->ptid), | |
1309 | status_to_str (status)); | |
1310 | } | |
1311 | } | |
1312 | ||
1313 | /* Check if the thread has exited. */ | |
1314 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
1315 | { | |
1316 | thread_dead = 1; | |
1317 | if (debug_linux_nat) | |
1318 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
1319 | target_pid_to_str (lp->ptid)); | |
1320 | } | |
1321 | ||
1322 | if (thread_dead) | |
1323 | { | |
1324 | if (in_thread_list (lp->ptid)) | |
1325 | { | |
1326 | /* Core GDB cannot deal with us deleting the current thread. */ | |
1327 | if (!ptid_equal (lp->ptid, inferior_ptid)) | |
1328 | delete_thread (lp->ptid); | |
a3f17187 | 1329 | printf_unfiltered (_("[%s exited]\n"), |
d6b0e80f AC |
1330 | target_pid_to_str (lp->ptid)); |
1331 | } | |
1332 | ||
1333 | delete_lwp (lp->ptid); | |
1334 | return 0; | |
1335 | } | |
1336 | ||
1337 | gdb_assert (WIFSTOPPED (status)); | |
1338 | ||
1339 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
1340 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1341 | { | |
1342 | if (debug_linux_nat) | |
1343 | fprintf_unfiltered (gdb_stdlog, | |
1344 | "WL: Handling extended status 0x%06x\n", | |
1345 | status); | |
1346 | if (linux_nat_handle_extended (lp, status)) | |
1347 | return wait_lwp (lp); | |
1348 | } | |
1349 | ||
1350 | return status; | |
1351 | } | |
1352 | ||
1353 | /* Send a SIGSTOP to LP. */ | |
1354 | ||
1355 | static int | |
1356 | stop_callback (struct lwp_info *lp, void *data) | |
1357 | { | |
1358 | if (!lp->stopped && !lp->signalled) | |
1359 | { | |
1360 | int ret; | |
1361 | ||
1362 | if (debug_linux_nat) | |
1363 | { | |
1364 | fprintf_unfiltered (gdb_stdlog, | |
1365 | "SC: kill %s **<SIGSTOP>**\n", | |
1366 | target_pid_to_str (lp->ptid)); | |
1367 | } | |
1368 | errno = 0; | |
1369 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
1370 | if (debug_linux_nat) | |
1371 | { | |
1372 | fprintf_unfiltered (gdb_stdlog, | |
1373 | "SC: lwp kill %d %s\n", | |
1374 | ret, | |
1375 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
1376 | } | |
1377 | ||
1378 | lp->signalled = 1; | |
1379 | gdb_assert (lp->status == 0); | |
1380 | } | |
1381 | ||
1382 | return 0; | |
1383 | } | |
1384 | ||
1385 | /* Wait until LP is stopped. If DATA is non-null it is interpreted as | |
1386 | a pointer to a set of signals to be flushed immediately. */ | |
1387 | ||
1388 | static int | |
1389 | stop_wait_callback (struct lwp_info *lp, void *data) | |
1390 | { | |
1391 | sigset_t *flush_mask = data; | |
1392 | ||
1393 | if (!lp->stopped) | |
1394 | { | |
1395 | int status; | |
1396 | ||
1397 | status = wait_lwp (lp); | |
1398 | if (status == 0) | |
1399 | return 0; | |
1400 | ||
1401 | /* Ignore any signals in FLUSH_MASK. */ | |
1402 | if (flush_mask && sigismember (flush_mask, WSTOPSIG (status))) | |
1403 | { | |
1404 | if (!lp->signalled) | |
1405 | { | |
1406 | lp->stopped = 1; | |
1407 | return 0; | |
1408 | } | |
1409 | ||
1410 | errno = 0; | |
1411 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1412 | if (debug_linux_nat) | |
1413 | fprintf_unfiltered (gdb_stdlog, | |
1414 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
1415 | target_pid_to_str (lp->ptid), | |
1416 | errno ? safe_strerror (errno) : "OK"); | |
1417 | ||
1418 | return stop_wait_callback (lp, flush_mask); | |
1419 | } | |
1420 | ||
1421 | if (WSTOPSIG (status) != SIGSTOP) | |
1422 | { | |
1423 | if (WSTOPSIG (status) == SIGTRAP) | |
1424 | { | |
1425 | /* If a LWP other than the LWP that we're reporting an | |
1426 | event for has hit a GDB breakpoint (as opposed to | |
1427 | some random trap signal), then just arrange for it to | |
1428 | hit it again later. We don't keep the SIGTRAP status | |
1429 | and don't forward the SIGTRAP signal to the LWP. We | |
1430 | will handle the current event, eventually we will | |
1431 | resume all LWPs, and this one will get its breakpoint | |
1432 | trap again. | |
1433 | ||
1434 | If we do not do this, then we run the risk that the | |
1435 | user will delete or disable the breakpoint, but the | |
1436 | thread will have already tripped on it. */ | |
1437 | ||
1438 | /* Now resume this LWP and get the SIGSTOP event. */ | |
1439 | errno = 0; | |
1440 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1441 | if (debug_linux_nat) | |
1442 | { | |
1443 | fprintf_unfiltered (gdb_stdlog, | |
1444 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
1445 | target_pid_to_str (lp->ptid), | |
1446 | errno ? safe_strerror (errno) : "OK"); | |
1447 | ||
1448 | fprintf_unfiltered (gdb_stdlog, | |
1449 | "SWC: Candidate SIGTRAP event in %s\n", | |
1450 | target_pid_to_str (lp->ptid)); | |
1451 | } | |
1452 | /* Hold the SIGTRAP for handling by linux_nat_wait. */ | |
1453 | stop_wait_callback (lp, data); | |
1454 | /* If there's another event, throw it back into the queue. */ | |
1455 | if (lp->status) | |
1456 | { | |
1457 | if (debug_linux_nat) | |
1458 | { | |
1459 | fprintf_unfiltered (gdb_stdlog, | |
1460 | "SWC: kill %s, %s\n", | |
1461 | target_pid_to_str (lp->ptid), | |
1462 | status_to_str ((int) status)); | |
1463 | } | |
1464 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
1465 | } | |
1466 | /* Save the sigtrap event. */ | |
1467 | lp->status = status; | |
1468 | return 0; | |
1469 | } | |
1470 | else | |
1471 | { | |
1472 | /* The thread was stopped with a signal other than | |
1473 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
1474 | ||
1475 | if (debug_linux_nat) | |
1476 | { | |
1477 | fprintf_unfiltered (gdb_stdlog, | |
1478 | "SWC: Pending event %s in %s\n", | |
1479 | status_to_str ((int) status), | |
1480 | target_pid_to_str (lp->ptid)); | |
1481 | } | |
1482 | /* Now resume this LWP and get the SIGSTOP event. */ | |
1483 | errno = 0; | |
1484 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1485 | if (debug_linux_nat) | |
1486 | fprintf_unfiltered (gdb_stdlog, | |
1487 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
1488 | target_pid_to_str (lp->ptid), | |
1489 | errno ? safe_strerror (errno) : "OK"); | |
1490 | ||
1491 | /* Hold this event/waitstatus while we check to see if | |
1492 | there are any more (we still want to get that SIGSTOP). */ | |
1493 | stop_wait_callback (lp, data); | |
1494 | /* If the lp->status field is still empty, use it to hold | |
1495 | this event. If not, then this event must be returned | |
1496 | to the event queue of the LWP. */ | |
1497 | if (lp->status == 0) | |
1498 | lp->status = status; | |
1499 | else | |
1500 | { | |
1501 | if (debug_linux_nat) | |
1502 | { | |
1503 | fprintf_unfiltered (gdb_stdlog, | |
1504 | "SWC: kill %s, %s\n", | |
1505 | target_pid_to_str (lp->ptid), | |
1506 | status_to_str ((int) status)); | |
1507 | } | |
1508 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
1509 | } | |
1510 | return 0; | |
1511 | } | |
1512 | } | |
1513 | else | |
1514 | { | |
1515 | /* We caught the SIGSTOP that we intended to catch, so | |
1516 | there's no SIGSTOP pending. */ | |
1517 | lp->stopped = 1; | |
1518 | lp->signalled = 0; | |
1519 | } | |
1520 | } | |
1521 | ||
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | /* Check whether PID has any pending signals in FLUSH_MASK. If so set | |
1526 | the appropriate bits in PENDING, and return 1 - otherwise return 0. */ | |
1527 | ||
1528 | static int | |
1529 | linux_nat_has_pending (int pid, sigset_t *pending, sigset_t *flush_mask) | |
1530 | { | |
1531 | sigset_t blocked, ignored; | |
1532 | int i; | |
1533 | ||
1534 | linux_proc_pending_signals (pid, pending, &blocked, &ignored); | |
1535 | ||
1536 | if (!flush_mask) | |
1537 | return 0; | |
1538 | ||
1539 | for (i = 1; i < NSIG; i++) | |
1540 | if (sigismember (pending, i)) | |
1541 | if (!sigismember (flush_mask, i) | |
1542 | || sigismember (&blocked, i) | |
1543 | || sigismember (&ignored, i)) | |
1544 | sigdelset (pending, i); | |
1545 | ||
1546 | if (sigisemptyset (pending)) | |
1547 | return 0; | |
1548 | ||
1549 | return 1; | |
1550 | } | |
1551 | ||
1552 | /* DATA is interpreted as a mask of signals to flush. If LP has | |
1553 | signals pending, and they are all in the flush mask, then arrange | |
1554 | to flush them. LP should be stopped, as should all other threads | |
1555 | it might share a signal queue with. */ | |
1556 | ||
1557 | static int | |
1558 | flush_callback (struct lwp_info *lp, void *data) | |
1559 | { | |
1560 | sigset_t *flush_mask = data; | |
1561 | sigset_t pending, intersection, blocked, ignored; | |
1562 | int pid, status; | |
1563 | ||
1564 | /* Normally, when an LWP exits, it is removed from the LWP list. The | |
1565 | last LWP isn't removed till later, however. So if there is only | |
1566 | one LWP on the list, make sure it's alive. */ | |
1567 | if (lwp_list == lp && lp->next == NULL) | |
1568 | if (!linux_nat_thread_alive (lp->ptid)) | |
1569 | return 0; | |
1570 | ||
1571 | /* Just because the LWP is stopped doesn't mean that new signals | |
1572 | can't arrive from outside, so this function must be careful of | |
1573 | race conditions. However, because all threads are stopped, we | |
1574 | can assume that the pending mask will not shrink unless we resume | |
1575 | the LWP, and that it will then get another signal. We can't | |
1576 | control which one, however. */ | |
1577 | ||
1578 | if (lp->status) | |
1579 | { | |
1580 | if (debug_linux_nat) | |
a3f17187 | 1581 | printf_unfiltered (_("FC: LP has pending status %06x\n"), lp->status); |
d6b0e80f AC |
1582 | if (WIFSTOPPED (lp->status) && sigismember (flush_mask, WSTOPSIG (lp->status))) |
1583 | lp->status = 0; | |
1584 | } | |
1585 | ||
1586 | while (linux_nat_has_pending (GET_LWP (lp->ptid), &pending, flush_mask)) | |
1587 | { | |
1588 | int ret; | |
1589 | ||
1590 | errno = 0; | |
1591 | ret = ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1592 | if (debug_linux_nat) | |
1593 | fprintf_unfiltered (gdb_stderr, | |
1594 | "FC: Sent PTRACE_CONT, ret %d %d\n", ret, errno); | |
1595 | ||
1596 | lp->stopped = 0; | |
1597 | stop_wait_callback (lp, flush_mask); | |
1598 | if (debug_linux_nat) | |
1599 | fprintf_unfiltered (gdb_stderr, | |
1600 | "FC: Wait finished; saved status is %d\n", | |
1601 | lp->status); | |
1602 | } | |
1603 | ||
1604 | return 0; | |
1605 | } | |
1606 | ||
1607 | /* Return non-zero if LP has a wait status pending. */ | |
1608 | ||
1609 | static int | |
1610 | status_callback (struct lwp_info *lp, void *data) | |
1611 | { | |
1612 | /* Only report a pending wait status if we pretend that this has | |
1613 | indeed been resumed. */ | |
1614 | return (lp->status != 0 && lp->resumed); | |
1615 | } | |
1616 | ||
1617 | /* Return non-zero if LP isn't stopped. */ | |
1618 | ||
1619 | static int | |
1620 | running_callback (struct lwp_info *lp, void *data) | |
1621 | { | |
1622 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
1623 | } | |
1624 | ||
1625 | /* Count the LWP's that have had events. */ | |
1626 | ||
1627 | static int | |
1628 | count_events_callback (struct lwp_info *lp, void *data) | |
1629 | { | |
1630 | int *count = data; | |
1631 | ||
1632 | gdb_assert (count != NULL); | |
1633 | ||
1634 | /* Count only LWPs that have a SIGTRAP event pending. */ | |
1635 | if (lp->status != 0 | |
1636 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) | |
1637 | (*count)++; | |
1638 | ||
1639 | return 0; | |
1640 | } | |
1641 | ||
1642 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1643 | ||
1644 | static int | |
1645 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
1646 | { | |
1647 | if (lp->step && lp->status != 0) | |
1648 | return 1; | |
1649 | else | |
1650 | return 0; | |
1651 | } | |
1652 | ||
1653 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
1654 | ||
1655 | static int | |
1656 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
1657 | { | |
1658 | int *selector = data; | |
1659 | ||
1660 | gdb_assert (selector != NULL); | |
1661 | ||
1662 | /* Select only LWPs that have a SIGTRAP event pending. */ | |
1663 | if (lp->status != 0 | |
1664 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) | |
1665 | if ((*selector)-- == 0) | |
1666 | return 1; | |
1667 | ||
1668 | return 0; | |
1669 | } | |
1670 | ||
1671 | static int | |
1672 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
1673 | { | |
1674 | struct lwp_info *event_lp = data; | |
1675 | ||
1676 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1677 | if (lp == event_lp) | |
1678 | return 0; | |
1679 | ||
1680 | /* If a LWP other than the LWP that we're reporting an event for has | |
1681 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1682 | then just arrange for it to hit it again later. We don't keep | |
1683 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1684 | LWP. We will handle the current event, eventually we will resume | |
1685 | all LWPs, and this one will get its breakpoint trap again. | |
1686 | ||
1687 | If we do not do this, then we run the risk that the user will | |
1688 | delete or disable the breakpoint, but the LWP will have already | |
1689 | tripped on it. */ | |
1690 | ||
1691 | if (lp->status != 0 | |
1692 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP | |
1693 | && breakpoint_inserted_here_p (read_pc_pid (lp->ptid) - | |
1694 | DECR_PC_AFTER_BREAK)) | |
1695 | { | |
1696 | if (debug_linux_nat) | |
1697 | fprintf_unfiltered (gdb_stdlog, | |
1698 | "CBC: Push back breakpoint for %s\n", | |
1699 | target_pid_to_str (lp->ptid)); | |
1700 | ||
1701 | /* Back up the PC if necessary. */ | |
1702 | if (DECR_PC_AFTER_BREAK) | |
1703 | write_pc_pid (read_pc_pid (lp->ptid) - DECR_PC_AFTER_BREAK, lp->ptid); | |
1704 | ||
1705 | /* Throw away the SIGTRAP. */ | |
1706 | lp->status = 0; | |
1707 | } | |
1708 | ||
1709 | return 0; | |
1710 | } | |
1711 | ||
1712 | /* Select one LWP out of those that have events pending. */ | |
1713 | ||
1714 | static void | |
1715 | select_event_lwp (struct lwp_info **orig_lp, int *status) | |
1716 | { | |
1717 | int num_events = 0; | |
1718 | int random_selector; | |
1719 | struct lwp_info *event_lp; | |
1720 | ||
ac264b3b | 1721 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
1722 | (*orig_lp)->status = *status; |
1723 | ||
1724 | /* Give preference to any LWP that is being single-stepped. */ | |
1725 | event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL); | |
1726 | if (event_lp != NULL) | |
1727 | { | |
1728 | if (debug_linux_nat) | |
1729 | fprintf_unfiltered (gdb_stdlog, | |
1730 | "SEL: Select single-step %s\n", | |
1731 | target_pid_to_str (event_lp->ptid)); | |
1732 | } | |
1733 | else | |
1734 | { | |
1735 | /* No single-stepping LWP. Select one at random, out of those | |
1736 | which have had SIGTRAP events. */ | |
1737 | ||
1738 | /* First see how many SIGTRAP events we have. */ | |
1739 | iterate_over_lwps (count_events_callback, &num_events); | |
1740 | ||
1741 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1742 | random_selector = (int) | |
1743 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1744 | ||
1745 | if (debug_linux_nat && num_events > 1) | |
1746 | fprintf_unfiltered (gdb_stdlog, | |
1747 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1748 | num_events, random_selector); | |
1749 | ||
1750 | event_lp = iterate_over_lwps (select_event_lwp_callback, | |
1751 | &random_selector); | |
1752 | } | |
1753 | ||
1754 | if (event_lp != NULL) | |
1755 | { | |
1756 | /* Switch the event LWP. */ | |
1757 | *orig_lp = event_lp; | |
1758 | *status = event_lp->status; | |
1759 | } | |
1760 | ||
1761 | /* Flush the wait status for the event LWP. */ | |
1762 | (*orig_lp)->status = 0; | |
1763 | } | |
1764 | ||
1765 | /* Return non-zero if LP has been resumed. */ | |
1766 | ||
1767 | static int | |
1768 | resumed_callback (struct lwp_info *lp, void *data) | |
1769 | { | |
1770 | return lp->resumed; | |
1771 | } | |
1772 | ||
ac264b3b MS |
1773 | /* Local mourn_inferior -- we need to override mourn_inferior |
1774 | so that we can do something clever if one of several forks | |
1775 | has exited. */ | |
1776 | ||
1777 | static void | |
1778 | child_mourn_inferior (void) | |
1779 | { | |
1780 | int status; | |
1781 | ||
1782 | if (! forks_exist_p ()) | |
1783 | { | |
1784 | /* Normal case, no other forks available. */ | |
1785 | super_mourn_inferior (); | |
1786 | return; | |
1787 | } | |
1788 | else | |
1789 | { | |
1790 | /* Multi-fork case. The current inferior_ptid has exited, but | |
1791 | there are other viable forks to debug. Delete the exiting | |
1792 | one and context-switch to the first available. */ | |
1793 | linux_fork_mourn_inferior (); | |
1794 | } | |
1795 | } | |
1796 | ||
d6b0e80f AC |
1797 | /* We need to override child_wait to support attaching to cloned |
1798 | processes, since a normal wait (as done by the default version) | |
1799 | ignores those processes. */ | |
1800 | ||
1801 | /* Wait for child PTID to do something. Return id of the child, | |
1802 | minus_one_ptid in case of error; store status into *OURSTATUS. */ | |
1803 | ||
1804 | ptid_t | |
1805 | child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
1806 | { | |
1807 | int save_errno; | |
1808 | int status; | |
1809 | pid_t pid; | |
1810 | ||
1811 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1812 | ||
1813 | do | |
1814 | { | |
1815 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
1816 | attached process. */ | |
1817 | set_sigio_trap (); | |
1818 | ||
58aecb61 | 1819 | pid = my_waitpid (GET_PID (ptid), &status, 0); |
d6b0e80f AC |
1820 | if (pid == -1 && errno == ECHILD) |
1821 | /* Try again with __WCLONE to check cloned processes. */ | |
58aecb61 | 1822 | pid = my_waitpid (GET_PID (ptid), &status, __WCLONE); |
d6b0e80f AC |
1823 | |
1824 | if (debug_linux_nat) | |
1825 | { | |
1826 | fprintf_unfiltered (gdb_stdlog, | |
1827 | "CW: waitpid %ld received %s\n", | |
1828 | (long) pid, status_to_str (status)); | |
1829 | } | |
1830 | ||
1831 | save_errno = errno; | |
1832 | ||
1833 | /* Make sure we don't report an event for the exit of the | |
1834 | original program, if we've detached from it. */ | |
1835 | if (pid != -1 && !WIFSTOPPED (status) && pid != GET_PID (inferior_ptid)) | |
1836 | { | |
1837 | pid = -1; | |
1838 | save_errno = EINTR; | |
1839 | } | |
1840 | ||
1841 | /* Check for stop events reported by a process we didn't already | |
1842 | know about - in this case, anything other than inferior_ptid. | |
1843 | ||
1844 | If we're expecting to receive stopped processes after fork, | |
1845 | vfork, and clone events, then we'll just add the new one to | |
1846 | our list and go back to waiting for the event to be reported | |
1847 | - the stopped process might be returned from waitpid before | |
1848 | or after the event is. If we want to handle debugging of | |
1849 | CLONE_PTRACE processes we need to do more here, i.e. switch | |
1850 | to multi-threaded mode. */ | |
1851 | if (pid != -1 && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP | |
1852 | && pid != GET_PID (inferior_ptid)) | |
1853 | { | |
1854 | linux_record_stopped_pid (pid); | |
1855 | pid = -1; | |
1856 | save_errno = EINTR; | |
1857 | } | |
1858 | ||
1859 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
1860 | if (pid != -1 && WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP | |
1861 | && status >> 16 != 0) | |
1862 | { | |
1863 | linux_handle_extended_wait (pid, status, ourstatus); | |
1864 | ||
1865 | /* If we see a clone event, detach the child, and don't | |
1866 | report the event. It would be nice to offer some way to | |
1867 | switch into a non-thread-db based threaded mode at this | |
1868 | point. */ | |
1869 | if (ourstatus->kind == TARGET_WAITKIND_SPURIOUS) | |
1870 | { | |
1871 | ptrace (PTRACE_DETACH, ourstatus->value.related_pid, 0, 0); | |
1872 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
1873 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1874 | pid = -1; | |
1875 | save_errno = EINTR; | |
1876 | } | |
1877 | } | |
1878 | ||
1879 | clear_sigio_trap (); | |
1880 | clear_sigint_trap (); | |
1881 | } | |
1882 | while (pid == -1 && save_errno == EINTR); | |
1883 | ||
1884 | if (pid == -1) | |
1885 | { | |
8a3fe4f8 | 1886 | warning (_("Child process unexpectedly missing: %s"), |
d6b0e80f AC |
1887 | safe_strerror (errno)); |
1888 | ||
1889 | /* Claim it exited with unknown signal. */ | |
1890 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1891 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
1892 | return minus_one_ptid; | |
1893 | } | |
1894 | ||
1895 | if (ourstatus->kind == TARGET_WAITKIND_IGNORE) | |
1896 | store_waitstatus (ourstatus, status); | |
1897 | ||
1898 | return pid_to_ptid (pid); | |
1899 | } | |
1900 | ||
d6b0e80f AC |
1901 | /* Stop an active thread, verify it still exists, then resume it. */ |
1902 | ||
1903 | static int | |
1904 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
1905 | { | |
1906 | struct lwp_info *ptr; | |
1907 | ||
1908 | if (!lp->stopped && !lp->signalled) | |
1909 | { | |
1910 | stop_callback (lp, NULL); | |
1911 | stop_wait_callback (lp, NULL); | |
1912 | /* Resume if the lwp still exists. */ | |
1913 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
1914 | if (lp == ptr) | |
1915 | { | |
1916 | resume_callback (lp, NULL); | |
1917 | resume_set_callback (lp, NULL); | |
1918 | } | |
1919 | } | |
1920 | return 0; | |
1921 | } | |
1922 | ||
1923 | static ptid_t | |
1924 | linux_nat_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
1925 | { | |
1926 | struct lwp_info *lp = NULL; | |
1927 | int options = 0; | |
1928 | int status = 0; | |
1929 | pid_t pid = PIDGET (ptid); | |
1930 | sigset_t flush_mask; | |
1931 | ||
1932 | sigemptyset (&flush_mask); | |
1933 | ||
1934 | /* Make sure SIGCHLD is blocked. */ | |
1935 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
1936 | { | |
1937 | sigaddset (&blocked_mask, SIGCHLD); | |
1938 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
1939 | } | |
1940 | ||
1941 | retry: | |
1942 | ||
1943 | /* Make sure there is at least one LWP that has been resumed, at | |
1944 | least if there are any LWPs at all. */ | |
1945 | gdb_assert (num_lwps == 0 || iterate_over_lwps (resumed_callback, NULL)); | |
1946 | ||
1947 | /* First check if there is a LWP with a wait status pending. */ | |
1948 | if (pid == -1) | |
1949 | { | |
1950 | /* Any LWP that's been resumed will do. */ | |
1951 | lp = iterate_over_lwps (status_callback, NULL); | |
1952 | if (lp) | |
1953 | { | |
1954 | status = lp->status; | |
1955 | lp->status = 0; | |
1956 | ||
1957 | if (debug_linux_nat && status) | |
1958 | fprintf_unfiltered (gdb_stdlog, | |
1959 | "LLW: Using pending wait status %s for %s.\n", | |
1960 | status_to_str (status), | |
1961 | target_pid_to_str (lp->ptid)); | |
1962 | } | |
1963 | ||
1964 | /* But if we don't fine one, we'll have to wait, and check both | |
1965 | cloned and uncloned processes. We start with the cloned | |
1966 | processes. */ | |
1967 | options = __WCLONE | WNOHANG; | |
1968 | } | |
1969 | else if (is_lwp (ptid)) | |
1970 | { | |
1971 | if (debug_linux_nat) | |
1972 | fprintf_unfiltered (gdb_stdlog, | |
1973 | "LLW: Waiting for specific LWP %s.\n", | |
1974 | target_pid_to_str (ptid)); | |
1975 | ||
1976 | /* We have a specific LWP to check. */ | |
1977 | lp = find_lwp_pid (ptid); | |
1978 | gdb_assert (lp); | |
1979 | status = lp->status; | |
1980 | lp->status = 0; | |
1981 | ||
1982 | if (debug_linux_nat && status) | |
1983 | fprintf_unfiltered (gdb_stdlog, | |
1984 | "LLW: Using pending wait status %s for %s.\n", | |
1985 | status_to_str (status), | |
1986 | target_pid_to_str (lp->ptid)); | |
1987 | ||
1988 | /* If we have to wait, take into account whether PID is a cloned | |
1989 | process or not. And we have to convert it to something that | |
1990 | the layer beneath us can understand. */ | |
1991 | options = lp->cloned ? __WCLONE : 0; | |
1992 | pid = GET_LWP (ptid); | |
1993 | } | |
1994 | ||
1995 | if (status && lp->signalled) | |
1996 | { | |
1997 | /* A pending SIGSTOP may interfere with the normal stream of | |
1998 | events. In a typical case where interference is a problem, | |
1999 | we have a SIGSTOP signal pending for LWP A while | |
2000 | single-stepping it, encounter an event in LWP B, and take the | |
2001 | pending SIGSTOP while trying to stop LWP A. After processing | |
2002 | the event in LWP B, LWP A is continued, and we'll never see | |
2003 | the SIGTRAP associated with the last time we were | |
2004 | single-stepping LWP A. */ | |
2005 | ||
2006 | /* Resume the thread. It should halt immediately returning the | |
2007 | pending SIGSTOP. */ | |
2008 | registers_changed (); | |
10d6c8cd DJ |
2009 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
2010 | lp->step, TARGET_SIGNAL_0); | |
d6b0e80f AC |
2011 | if (debug_linux_nat) |
2012 | fprintf_unfiltered (gdb_stdlog, | |
2013 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
2014 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2015 | target_pid_to_str (lp->ptid)); | |
2016 | lp->stopped = 0; | |
2017 | gdb_assert (lp->resumed); | |
2018 | ||
2019 | /* This should catch the pending SIGSTOP. */ | |
2020 | stop_wait_callback (lp, NULL); | |
2021 | } | |
2022 | ||
2023 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
2024 | attached process. */ | |
2025 | set_sigio_trap (); | |
2026 | ||
2027 | while (status == 0) | |
2028 | { | |
2029 | pid_t lwpid; | |
2030 | ||
58aecb61 | 2031 | lwpid = my_waitpid (pid, &status, options); |
d6b0e80f AC |
2032 | if (lwpid > 0) |
2033 | { | |
2034 | gdb_assert (pid == -1 || lwpid == pid); | |
2035 | ||
2036 | if (debug_linux_nat) | |
2037 | { | |
2038 | fprintf_unfiltered (gdb_stdlog, | |
2039 | "LLW: waitpid %ld received %s\n", | |
2040 | (long) lwpid, status_to_str (status)); | |
2041 | } | |
2042 | ||
2043 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2044 | ||
2045 | /* Check for stop events reported by a process we didn't | |
2046 | already know about - anything not already in our LWP | |
2047 | list. | |
2048 | ||
2049 | If we're expecting to receive stopped processes after | |
2050 | fork, vfork, and clone events, then we'll just add the | |
2051 | new one to our list and go back to waiting for the event | |
2052 | to be reported - the stopped process might be returned | |
2053 | from waitpid before or after the event is. */ | |
2054 | if (WIFSTOPPED (status) && !lp) | |
2055 | { | |
2056 | linux_record_stopped_pid (lwpid); | |
2057 | status = 0; | |
2058 | continue; | |
2059 | } | |
2060 | ||
2061 | /* Make sure we don't report an event for the exit of an LWP not in | |
2062 | our list, i.e. not part of the current process. This can happen | |
2063 | if we detach from a program we original forked and then it | |
2064 | exits. */ | |
2065 | if (!WIFSTOPPED (status) && !lp) | |
2066 | { | |
2067 | status = 0; | |
2068 | continue; | |
2069 | } | |
2070 | ||
2071 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
2072 | CLONE_PTRACE processes which do not use the thread library - | |
2073 | otherwise we wouldn't find the new LWP this way. That doesn't | |
2074 | currently work, and the following code is currently unreachable | |
2075 | due to the two blocks above. If it's fixed some day, this code | |
2076 | should be broken out into a function so that we can also pick up | |
2077 | LWPs from the new interface. */ | |
2078 | if (!lp) | |
2079 | { | |
2080 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
2081 | if (options & __WCLONE) | |
2082 | lp->cloned = 1; | |
2083 | ||
2084 | if (threaded) | |
2085 | { | |
2086 | gdb_assert (WIFSTOPPED (status) | |
2087 | && WSTOPSIG (status) == SIGSTOP); | |
2088 | lp->signalled = 1; | |
2089 | ||
2090 | if (!in_thread_list (inferior_ptid)) | |
2091 | { | |
2092 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
2093 | GET_PID (inferior_ptid)); | |
2094 | add_thread (inferior_ptid); | |
2095 | } | |
2096 | ||
2097 | add_thread (lp->ptid); | |
a3f17187 | 2098 | printf_unfiltered (_("[New %s]\n"), |
d6b0e80f AC |
2099 | target_pid_to_str (lp->ptid)); |
2100 | } | |
2101 | } | |
2102 | ||
2103 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
2104 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2105 | { | |
2106 | if (debug_linux_nat) | |
2107 | fprintf_unfiltered (gdb_stdlog, | |
2108 | "LLW: Handling extended status 0x%06x\n", | |
2109 | status); | |
2110 | if (linux_nat_handle_extended (lp, status)) | |
2111 | { | |
2112 | status = 0; | |
2113 | continue; | |
2114 | } | |
2115 | } | |
2116 | ||
2117 | /* Check if the thread has exited. */ | |
2118 | if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1) | |
2119 | { | |
2120 | if (in_thread_list (lp->ptid)) | |
2121 | { | |
2122 | /* Core GDB cannot deal with us deleting the current | |
2123 | thread. */ | |
2124 | if (!ptid_equal (lp->ptid, inferior_ptid)) | |
2125 | delete_thread (lp->ptid); | |
a3f17187 | 2126 | printf_unfiltered (_("[%s exited]\n"), |
d6b0e80f AC |
2127 | target_pid_to_str (lp->ptid)); |
2128 | } | |
2129 | ||
2130 | /* If this is the main thread, we must stop all threads and | |
2131 | verify if they are still alive. This is because in the nptl | |
2132 | thread model, there is no signal issued for exiting LWPs | |
2133 | other than the main thread. We only get the main thread | |
2134 | exit signal once all child threads have already exited. | |
2135 | If we stop all the threads and use the stop_wait_callback | |
2136 | to check if they have exited we can determine whether this | |
2137 | signal should be ignored or whether it means the end of the | |
2138 | debugged application, regardless of which threading model | |
2139 | is being used. */ | |
2140 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) | |
2141 | { | |
2142 | lp->stopped = 1; | |
2143 | iterate_over_lwps (stop_and_resume_callback, NULL); | |
2144 | } | |
2145 | ||
2146 | if (debug_linux_nat) | |
2147 | fprintf_unfiltered (gdb_stdlog, | |
2148 | "LLW: %s exited.\n", | |
2149 | target_pid_to_str (lp->ptid)); | |
2150 | ||
2151 | delete_lwp (lp->ptid); | |
2152 | ||
2153 | /* If there is at least one more LWP, then the exit signal | |
2154 | was not the end of the debugged application and should be | |
2155 | ignored. */ | |
2156 | if (num_lwps > 0) | |
2157 | { | |
2158 | /* Make sure there is at least one thread running. */ | |
2159 | gdb_assert (iterate_over_lwps (running_callback, NULL)); | |
2160 | ||
2161 | /* Discard the event. */ | |
2162 | status = 0; | |
2163 | continue; | |
2164 | } | |
2165 | } | |
2166 | ||
2167 | /* Check if the current LWP has previously exited. In the nptl | |
2168 | thread model, LWPs other than the main thread do not issue | |
2169 | signals when they exit so we must check whenever the thread | |
2170 | has stopped. A similar check is made in stop_wait_callback(). */ | |
2171 | if (num_lwps > 1 && !linux_nat_thread_alive (lp->ptid)) | |
2172 | { | |
2173 | if (in_thread_list (lp->ptid)) | |
2174 | { | |
2175 | /* Core GDB cannot deal with us deleting the current | |
2176 | thread. */ | |
2177 | if (!ptid_equal (lp->ptid, inferior_ptid)) | |
2178 | delete_thread (lp->ptid); | |
a3f17187 | 2179 | printf_unfiltered (_("[%s exited]\n"), |
d6b0e80f AC |
2180 | target_pid_to_str (lp->ptid)); |
2181 | } | |
2182 | if (debug_linux_nat) | |
2183 | fprintf_unfiltered (gdb_stdlog, | |
2184 | "LLW: %s exited.\n", | |
2185 | target_pid_to_str (lp->ptid)); | |
2186 | ||
2187 | delete_lwp (lp->ptid); | |
2188 | ||
2189 | /* Make sure there is at least one thread running. */ | |
2190 | gdb_assert (iterate_over_lwps (running_callback, NULL)); | |
2191 | ||
2192 | /* Discard the event. */ | |
2193 | status = 0; | |
2194 | continue; | |
2195 | } | |
2196 | ||
2197 | /* Make sure we don't report a SIGSTOP that we sent | |
2198 | ourselves in an attempt to stop an LWP. */ | |
2199 | if (lp->signalled | |
2200 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
2201 | { | |
2202 | if (debug_linux_nat) | |
2203 | fprintf_unfiltered (gdb_stdlog, | |
2204 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
2205 | target_pid_to_str (lp->ptid)); | |
2206 | ||
2207 | /* This is a delayed SIGSTOP. */ | |
2208 | lp->signalled = 0; | |
2209 | ||
2210 | registers_changed (); | |
10d6c8cd DJ |
2211 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
2212 | lp->step, TARGET_SIGNAL_0); | |
d6b0e80f AC |
2213 | if (debug_linux_nat) |
2214 | fprintf_unfiltered (gdb_stdlog, | |
2215 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
2216 | lp->step ? | |
2217 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2218 | target_pid_to_str (lp->ptid)); | |
2219 | ||
2220 | lp->stopped = 0; | |
2221 | gdb_assert (lp->resumed); | |
2222 | ||
2223 | /* Discard the event. */ | |
2224 | status = 0; | |
2225 | continue; | |
2226 | } | |
2227 | ||
2228 | break; | |
2229 | } | |
2230 | ||
2231 | if (pid == -1) | |
2232 | { | |
2233 | /* Alternate between checking cloned and uncloned processes. */ | |
2234 | options ^= __WCLONE; | |
2235 | ||
2236 | /* And suspend every time we have checked both. */ | |
2237 | if (options & __WCLONE) | |
2238 | sigsuspend (&suspend_mask); | |
2239 | } | |
2240 | ||
2241 | /* We shouldn't end up here unless we want to try again. */ | |
2242 | gdb_assert (status == 0); | |
2243 | } | |
2244 | ||
2245 | clear_sigio_trap (); | |
2246 | clear_sigint_trap (); | |
2247 | ||
2248 | gdb_assert (lp); | |
2249 | ||
2250 | /* Don't report signals that GDB isn't interested in, such as | |
2251 | signals that are neither printed nor stopped upon. Stopping all | |
2252 | threads can be a bit time-consuming so if we want decent | |
2253 | performance with heavily multi-threaded programs, especially when | |
2254 | they're using a high frequency timer, we'd better avoid it if we | |
2255 | can. */ | |
2256 | ||
2257 | if (WIFSTOPPED (status)) | |
2258 | { | |
2259 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
2260 | ||
2261 | if (signal_stop_state (signo) == 0 | |
2262 | && signal_print_state (signo) == 0 | |
2263 | && signal_pass_state (signo) == 1) | |
2264 | { | |
2265 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
2266 | here? It is not clear we should. GDB may not expect | |
2267 | other threads to run. On the other hand, not resuming | |
2268 | newly attached threads may cause an unwanted delay in | |
2269 | getting them running. */ | |
2270 | registers_changed (); | |
10d6c8cd DJ |
2271 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
2272 | lp->step, signo); | |
d6b0e80f AC |
2273 | if (debug_linux_nat) |
2274 | fprintf_unfiltered (gdb_stdlog, | |
2275 | "LLW: %s %s, %s (preempt 'handle')\n", | |
2276 | lp->step ? | |
2277 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2278 | target_pid_to_str (lp->ptid), | |
2279 | signo ? strsignal (signo) : "0"); | |
2280 | lp->stopped = 0; | |
2281 | status = 0; | |
2282 | goto retry; | |
2283 | } | |
2284 | ||
2285 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
2286 | { | |
2287 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
2288 | forwarded to the entire process group, that is, all LWP's | |
2289 | will receive it. Since we only want to report it once, | |
2290 | we try to flush it from all LWPs except this one. */ | |
2291 | sigaddset (&flush_mask, SIGINT); | |
2292 | } | |
2293 | } | |
2294 | ||
2295 | /* This LWP is stopped now. */ | |
2296 | lp->stopped = 1; | |
2297 | ||
2298 | if (debug_linux_nat) | |
2299 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
2300 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
2301 | ||
2302 | /* Now stop all other LWP's ... */ | |
2303 | iterate_over_lwps (stop_callback, NULL); | |
2304 | ||
2305 | /* ... and wait until all of them have reported back that they're no | |
2306 | longer running. */ | |
2307 | iterate_over_lwps (stop_wait_callback, &flush_mask); | |
2308 | iterate_over_lwps (flush_callback, &flush_mask); | |
2309 | ||
2310 | /* If we're not waiting for a specific LWP, choose an event LWP from | |
2311 | among those that have had events. Giving equal priority to all | |
2312 | LWPs that have had events helps prevent starvation. */ | |
2313 | if (pid == -1) | |
2314 | select_event_lwp (&lp, &status); | |
2315 | ||
2316 | /* Now that we've selected our final event LWP, cancel any | |
2317 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
2318 | the comment in cancel_breakpoints_callback to find out why. */ | |
2319 | iterate_over_lwps (cancel_breakpoints_callback, lp); | |
2320 | ||
2321 | /* If we're not running in "threaded" mode, we'll report the bare | |
2322 | process id. */ | |
2323 | ||
2324 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) | |
2325 | { | |
2326 | trap_ptid = (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid))); | |
2327 | if (debug_linux_nat) | |
2328 | fprintf_unfiltered (gdb_stdlog, | |
2329 | "LLW: trap_ptid is %s.\n", | |
2330 | target_pid_to_str (trap_ptid)); | |
2331 | } | |
2332 | else | |
2333 | trap_ptid = null_ptid; | |
2334 | ||
2335 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2336 | { | |
2337 | *ourstatus = lp->waitstatus; | |
2338 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
2339 | } | |
2340 | else | |
2341 | store_waitstatus (ourstatus, status); | |
2342 | ||
2343 | return (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid))); | |
2344 | } | |
2345 | ||
2346 | static int | |
2347 | kill_callback (struct lwp_info *lp, void *data) | |
2348 | { | |
2349 | errno = 0; | |
2350 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
2351 | if (debug_linux_nat) | |
2352 | fprintf_unfiltered (gdb_stdlog, | |
2353 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
2354 | target_pid_to_str (lp->ptid), | |
2355 | errno ? safe_strerror (errno) : "OK"); | |
2356 | ||
2357 | return 0; | |
2358 | } | |
2359 | ||
2360 | static int | |
2361 | kill_wait_callback (struct lwp_info *lp, void *data) | |
2362 | { | |
2363 | pid_t pid; | |
2364 | ||
2365 | /* We must make sure that there are no pending events (delayed | |
2366 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
2367 | program doesn't interfere with any following debugging session. */ | |
2368 | ||
2369 | /* For cloned processes we must check both with __WCLONE and | |
2370 | without, since the exit status of a cloned process isn't reported | |
2371 | with __WCLONE. */ | |
2372 | if (lp->cloned) | |
2373 | { | |
2374 | do | |
2375 | { | |
58aecb61 | 2376 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
d6b0e80f AC |
2377 | if (pid != (pid_t) -1 && debug_linux_nat) |
2378 | { | |
2379 | fprintf_unfiltered (gdb_stdlog, | |
2380 | "KWC: wait %s received unknown.\n", | |
2381 | target_pid_to_str (lp->ptid)); | |
2382 | } | |
2383 | } | |
2384 | while (pid == GET_LWP (lp->ptid)); | |
2385 | ||
2386 | gdb_assert (pid == -1 && errno == ECHILD); | |
2387 | } | |
2388 | ||
2389 | do | |
2390 | { | |
58aecb61 | 2391 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
d6b0e80f AC |
2392 | if (pid != (pid_t) -1 && debug_linux_nat) |
2393 | { | |
2394 | fprintf_unfiltered (gdb_stdlog, | |
2395 | "KWC: wait %s received unk.\n", | |
2396 | target_pid_to_str (lp->ptid)); | |
2397 | } | |
2398 | } | |
2399 | while (pid == GET_LWP (lp->ptid)); | |
2400 | ||
2401 | gdb_assert (pid == -1 && errno == ECHILD); | |
2402 | return 0; | |
2403 | } | |
2404 | ||
2405 | static void | |
2406 | linux_nat_kill (void) | |
2407 | { | |
2408 | /* Kill all LWP's ... */ | |
2409 | iterate_over_lwps (kill_callback, NULL); | |
2410 | ||
2411 | /* ... and wait until we've flushed all events. */ | |
2412 | iterate_over_lwps (kill_wait_callback, NULL); | |
2413 | ||
2414 | target_mourn_inferior (); | |
2415 | } | |
2416 | ||
2417 | static void | |
2418 | linux_nat_create_inferior (char *exec_file, char *allargs, char **env, | |
2419 | int from_tty) | |
2420 | { | |
10d6c8cd | 2421 | linux_ops->to_create_inferior (exec_file, allargs, env, from_tty); |
d6b0e80f AC |
2422 | } |
2423 | ||
2424 | static void | |
2425 | linux_nat_mourn_inferior (void) | |
2426 | { | |
2427 | trap_ptid = null_ptid; | |
2428 | ||
2429 | /* Destroy LWP info; it's no longer valid. */ | |
2430 | init_lwp_list (); | |
2431 | ||
2432 | /* Restore the original signal mask. */ | |
2433 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); | |
2434 | sigemptyset (&blocked_mask); | |
2435 | ||
10d6c8cd | 2436 | linux_ops->to_mourn_inferior (); |
d6b0e80f AC |
2437 | } |
2438 | ||
10d6c8cd DJ |
2439 | static LONGEST |
2440 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
2441 | const char *annex, gdb_byte *readbuf, | |
2442 | const gdb_byte *writebuf, | |
2443 | ULONGEST offset, LONGEST len) | |
d6b0e80f AC |
2444 | { |
2445 | struct cleanup *old_chain = save_inferior_ptid (); | |
10d6c8cd | 2446 | LONGEST xfer; |
d6b0e80f AC |
2447 | |
2448 | if (is_lwp (inferior_ptid)) | |
2449 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
2450 | ||
10d6c8cd DJ |
2451 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
2452 | offset, len); | |
d6b0e80f AC |
2453 | |
2454 | do_cleanups (old_chain); | |
2455 | return xfer; | |
2456 | } | |
2457 | ||
2458 | static int | |
2459 | linux_nat_thread_alive (ptid_t ptid) | |
2460 | { | |
2461 | gdb_assert (is_lwp (ptid)); | |
2462 | ||
2463 | errno = 0; | |
2464 | ptrace (PTRACE_PEEKUSER, GET_LWP (ptid), 0, 0); | |
2465 | if (debug_linux_nat) | |
2466 | fprintf_unfiltered (gdb_stdlog, | |
2467 | "LLTA: PTRACE_PEEKUSER %s, 0, 0 (%s)\n", | |
2468 | target_pid_to_str (ptid), | |
2469 | errno ? safe_strerror (errno) : "OK"); | |
2470 | if (errno) | |
2471 | return 0; | |
2472 | ||
2473 | return 1; | |
2474 | } | |
2475 | ||
2476 | static char * | |
2477 | linux_nat_pid_to_str (ptid_t ptid) | |
2478 | { | |
2479 | static char buf[64]; | |
2480 | ||
2481 | if (is_lwp (ptid)) | |
2482 | { | |
2483 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
2484 | return buf; | |
2485 | } | |
2486 | ||
2487 | return normal_pid_to_str (ptid); | |
2488 | } | |
2489 | ||
10d6c8cd DJ |
2490 | static void |
2491 | linux_nat_fetch_registers (int regnum) | |
2492 | { | |
2493 | /* to_fetch_registers will honor the LWP ID, so we can use it directly. */ | |
2494 | linux_ops->to_fetch_registers (regnum); | |
2495 | } | |
2496 | ||
2497 | static void | |
2498 | linux_nat_store_registers (int regnum) | |
2499 | { | |
2500 | /* to_store_registers will honor the LWP ID, so we can use it directly. */ | |
2501 | linux_ops->to_store_registers (regnum); | |
2502 | } | |
2503 | ||
2504 | static void | |
2505 | linux_nat_child_post_startup_inferior (ptid_t ptid) | |
2506 | { | |
2507 | linux_ops->to_post_startup_inferior (ptid); | |
2508 | } | |
2509 | ||
d6b0e80f AC |
2510 | static void |
2511 | init_linux_nat_ops (void) | |
2512 | { | |
2513 | #if 0 | |
2514 | linux_nat_ops.to_open = linux_nat_open; | |
2515 | #endif | |
2516 | linux_nat_ops.to_shortname = "lwp-layer"; | |
2517 | linux_nat_ops.to_longname = "lwp-layer"; | |
2518 | linux_nat_ops.to_doc = "Low level threads support (LWP layer)"; | |
2519 | linux_nat_ops.to_attach = linux_nat_attach; | |
2520 | linux_nat_ops.to_detach = linux_nat_detach; | |
2521 | linux_nat_ops.to_resume = linux_nat_resume; | |
2522 | linux_nat_ops.to_wait = linux_nat_wait; | |
10d6c8cd DJ |
2523 | linux_nat_ops.to_fetch_registers = linux_nat_fetch_registers; |
2524 | linux_nat_ops.to_store_registers = linux_nat_store_registers; | |
2525 | linux_nat_ops.to_xfer_partial = linux_nat_xfer_partial; | |
d6b0e80f AC |
2526 | linux_nat_ops.to_kill = linux_nat_kill; |
2527 | linux_nat_ops.to_create_inferior = linux_nat_create_inferior; | |
2528 | linux_nat_ops.to_mourn_inferior = linux_nat_mourn_inferior; | |
2529 | linux_nat_ops.to_thread_alive = linux_nat_thread_alive; | |
2530 | linux_nat_ops.to_pid_to_str = linux_nat_pid_to_str; | |
10d6c8cd DJ |
2531 | linux_nat_ops.to_post_startup_inferior |
2532 | = linux_nat_child_post_startup_inferior; | |
d6b0e80f AC |
2533 | linux_nat_ops.to_post_attach = child_post_attach; |
2534 | linux_nat_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint; | |
2535 | linux_nat_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint; | |
2536 | linux_nat_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint; | |
2537 | ||
2538 | linux_nat_ops.to_stratum = thread_stratum; | |
2539 | linux_nat_ops.to_has_thread_control = tc_schedlock; | |
2540 | linux_nat_ops.to_magic = OPS_MAGIC; | |
2541 | } | |
2542 | ||
2543 | static void | |
2544 | sigchld_handler (int signo) | |
2545 | { | |
2546 | /* Do nothing. The only reason for this handler is that it allows | |
2547 | us to use sigsuspend in linux_nat_wait above to wait for the | |
2548 | arrival of a SIGCHLD. */ | |
2549 | } | |
2550 | ||
dba24537 AC |
2551 | /* Accepts an integer PID; Returns a string representing a file that |
2552 | can be opened to get the symbols for the child process. */ | |
2553 | ||
2554 | char * | |
2555 | child_pid_to_exec_file (int pid) | |
2556 | { | |
2557 | char *name1, *name2; | |
2558 | ||
2559 | name1 = xmalloc (MAXPATHLEN); | |
2560 | name2 = xmalloc (MAXPATHLEN); | |
2561 | make_cleanup (xfree, name1); | |
2562 | make_cleanup (xfree, name2); | |
2563 | memset (name2, 0, MAXPATHLEN); | |
2564 | ||
2565 | sprintf (name1, "/proc/%d/exe", pid); | |
2566 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
2567 | return name2; | |
2568 | else | |
2569 | return name1; | |
2570 | } | |
2571 | ||
2572 | /* Service function for corefiles and info proc. */ | |
2573 | ||
2574 | static int | |
2575 | read_mapping (FILE *mapfile, | |
2576 | long long *addr, | |
2577 | long long *endaddr, | |
2578 | char *permissions, | |
2579 | long long *offset, | |
2580 | char *device, long long *inode, char *filename) | |
2581 | { | |
2582 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
2583 | addr, endaddr, permissions, offset, device, inode); | |
2584 | ||
2e14c2ea MS |
2585 | filename[0] = '\0'; |
2586 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
2587 | { |
2588 | /* Eat everything up to EOL for the filename. This will prevent | |
2589 | weird filenames (such as one with embedded whitespace) from | |
2590 | confusing this code. It also makes this code more robust in | |
2591 | respect to annotations the kernel may add after the filename. | |
2592 | ||
2593 | Note the filename is used for informational purposes | |
2594 | only. */ | |
2595 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
2596 | } | |
2e14c2ea | 2597 | |
dba24537 AC |
2598 | return (ret != 0 && ret != EOF); |
2599 | } | |
2600 | ||
2601 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
2602 | regions in the inferior for a corefile. */ | |
2603 | ||
2604 | static int | |
2605 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
2606 | unsigned long, | |
2607 | int, int, int, void *), void *obfd) | |
2608 | { | |
2609 | long long pid = PIDGET (inferior_ptid); | |
2610 | char mapsfilename[MAXPATHLEN]; | |
2611 | FILE *mapsfile; | |
2612 | long long addr, endaddr, size, offset, inode; | |
2613 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
2614 | int read, write, exec; | |
2615 | int ret; | |
2616 | ||
2617 | /* Compose the filename for the /proc memory map, and open it. */ | |
2618 | sprintf (mapsfilename, "/proc/%lld/maps", pid); | |
2619 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) | |
8a3fe4f8 | 2620 | error (_("Could not open %s."), mapsfilename); |
dba24537 AC |
2621 | |
2622 | if (info_verbose) | |
2623 | fprintf_filtered (gdb_stdout, | |
2624 | "Reading memory regions from %s\n", mapsfilename); | |
2625 | ||
2626 | /* Now iterate until end-of-file. */ | |
2627 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
2628 | &offset, &device[0], &inode, &filename[0])) | |
2629 | { | |
2630 | size = endaddr - addr; | |
2631 | ||
2632 | /* Get the segment's permissions. */ | |
2633 | read = (strchr (permissions, 'r') != 0); | |
2634 | write = (strchr (permissions, 'w') != 0); | |
2635 | exec = (strchr (permissions, 'x') != 0); | |
2636 | ||
2637 | if (info_verbose) | |
2638 | { | |
2639 | fprintf_filtered (gdb_stdout, | |
2640 | "Save segment, %lld bytes at 0x%s (%c%c%c)", | |
2641 | size, paddr_nz (addr), | |
2642 | read ? 'r' : ' ', | |
2643 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
2644 | if (filename && filename[0]) | |
2645 | fprintf_filtered (gdb_stdout, " for %s", filename); | |
2646 | fprintf_filtered (gdb_stdout, "\n"); | |
2647 | } | |
2648 | ||
2649 | /* Invoke the callback function to create the corefile | |
2650 | segment. */ | |
2651 | func (addr, size, read, write, exec, obfd); | |
2652 | } | |
2653 | fclose (mapsfile); | |
2654 | return 0; | |
2655 | } | |
2656 | ||
2657 | /* Records the thread's register state for the corefile note | |
2658 | section. */ | |
2659 | ||
2660 | static char * | |
2661 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2662 | char *note_data, int *note_size) | |
2663 | { | |
2664 | gdb_gregset_t gregs; | |
2665 | gdb_fpregset_t fpregs; | |
2666 | #ifdef FILL_FPXREGSET | |
2667 | gdb_fpxregset_t fpxregs; | |
2668 | #endif | |
2669 | unsigned long lwp = ptid_get_lwp (ptid); | |
2670 | ||
2671 | fill_gregset (&gregs, -1); | |
2672 | note_data = (char *) elfcore_write_prstatus (obfd, | |
2673 | note_data, | |
2674 | note_size, | |
2675 | lwp, | |
2676 | stop_signal, &gregs); | |
2677 | ||
2678 | fill_fpregset (&fpregs, -1); | |
2679 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
2680 | note_data, | |
2681 | note_size, | |
2682 | &fpregs, sizeof (fpregs)); | |
2683 | #ifdef FILL_FPXREGSET | |
2684 | fill_fpxregset (&fpxregs, -1); | |
2685 | note_data = (char *) elfcore_write_prxfpreg (obfd, | |
2686 | note_data, | |
2687 | note_size, | |
2688 | &fpxregs, sizeof (fpxregs)); | |
2689 | #endif | |
2690 | return note_data; | |
2691 | } | |
2692 | ||
2693 | struct linux_nat_corefile_thread_data | |
2694 | { | |
2695 | bfd *obfd; | |
2696 | char *note_data; | |
2697 | int *note_size; | |
2698 | int num_notes; | |
2699 | }; | |
2700 | ||
2701 | /* Called by gdbthread.c once per thread. Records the thread's | |
2702 | register state for the corefile note section. */ | |
2703 | ||
2704 | static int | |
2705 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
2706 | { | |
2707 | struct linux_nat_corefile_thread_data *args = data; | |
2708 | ptid_t saved_ptid = inferior_ptid; | |
2709 | ||
2710 | inferior_ptid = ti->ptid; | |
2711 | registers_changed (); | |
2712 | target_fetch_registers (-1); /* FIXME should not be necessary; | |
2713 | fill_gregset should do it automatically. */ | |
2714 | args->note_data = linux_nat_do_thread_registers (args->obfd, | |
2715 | ti->ptid, | |
2716 | args->note_data, | |
2717 | args->note_size); | |
2718 | args->num_notes++; | |
2719 | inferior_ptid = saved_ptid; | |
2720 | registers_changed (); | |
2721 | target_fetch_registers (-1); /* FIXME should not be necessary; | |
2722 | fill_gregset should do it automatically. */ | |
2723 | return 0; | |
2724 | } | |
2725 | ||
2726 | /* Records the register state for the corefile note section. */ | |
2727 | ||
2728 | static char * | |
2729 | linux_nat_do_registers (bfd *obfd, ptid_t ptid, | |
2730 | char *note_data, int *note_size) | |
2731 | { | |
2732 | registers_changed (); | |
2733 | target_fetch_registers (-1); /* FIXME should not be necessary; | |
2734 | fill_gregset should do it automatically. */ | |
2735 | return linux_nat_do_thread_registers (obfd, | |
2736 | ptid_build (ptid_get_pid (inferior_ptid), | |
2737 | ptid_get_pid (inferior_ptid), | |
2738 | 0), | |
2739 | note_data, note_size); | |
2740 | return note_data; | |
2741 | } | |
2742 | ||
2743 | /* Fills the "to_make_corefile_note" target vector. Builds the note | |
2744 | section for a corefile, and returns it in a malloc buffer. */ | |
2745 | ||
2746 | static char * | |
2747 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
2748 | { | |
2749 | struct linux_nat_corefile_thread_data thread_args; | |
2750 | struct cleanup *old_chain; | |
2751 | char fname[16] = { '\0' }; | |
2752 | char psargs[80] = { '\0' }; | |
2753 | char *note_data = NULL; | |
2754 | ptid_t current_ptid = inferior_ptid; | |
c6826062 | 2755 | gdb_byte *auxv; |
dba24537 AC |
2756 | int auxv_len; |
2757 | ||
2758 | if (get_exec_file (0)) | |
2759 | { | |
2760 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
2761 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
2762 | if (get_inferior_args ()) | |
2763 | { | |
2764 | strncat (psargs, " ", sizeof (psargs) - strlen (psargs)); | |
2765 | strncat (psargs, get_inferior_args (), | |
2766 | sizeof (psargs) - strlen (psargs)); | |
2767 | } | |
2768 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
2769 | note_data, | |
2770 | note_size, fname, psargs); | |
2771 | } | |
2772 | ||
2773 | /* Dump information for threads. */ | |
2774 | thread_args.obfd = obfd; | |
2775 | thread_args.note_data = note_data; | |
2776 | thread_args.note_size = note_size; | |
2777 | thread_args.num_notes = 0; | |
2778 | iterate_over_lwps (linux_nat_corefile_thread_callback, &thread_args); | |
2779 | if (thread_args.num_notes == 0) | |
2780 | { | |
2781 | /* iterate_over_threads didn't come up with any threads; just | |
2782 | use inferior_ptid. */ | |
2783 | note_data = linux_nat_do_registers (obfd, inferior_ptid, | |
2784 | note_data, note_size); | |
2785 | } | |
2786 | else | |
2787 | { | |
2788 | note_data = thread_args.note_data; | |
2789 | } | |
2790 | ||
2791 | auxv_len = target_auxv_read (¤t_target, &auxv); | |
2792 | if (auxv_len > 0) | |
2793 | { | |
2794 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
2795 | "CORE", NT_AUXV, auxv, auxv_len); | |
2796 | xfree (auxv); | |
2797 | } | |
2798 | ||
2799 | make_cleanup (xfree, note_data); | |
2800 | return note_data; | |
2801 | } | |
2802 | ||
2803 | /* Implement the "info proc" command. */ | |
2804 | ||
2805 | static void | |
2806 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
2807 | { | |
2808 | long long pid = PIDGET (inferior_ptid); | |
2809 | FILE *procfile; | |
2810 | char **argv = NULL; | |
2811 | char buffer[MAXPATHLEN]; | |
2812 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
2813 | int cmdline_f = 1; | |
2814 | int cwd_f = 1; | |
2815 | int exe_f = 1; | |
2816 | int mappings_f = 0; | |
2817 | int environ_f = 0; | |
2818 | int status_f = 0; | |
2819 | int stat_f = 0; | |
2820 | int all = 0; | |
2821 | struct stat dummy; | |
2822 | ||
2823 | if (args) | |
2824 | { | |
2825 | /* Break up 'args' into an argv array. */ | |
2826 | if ((argv = buildargv (args)) == NULL) | |
2827 | nomem (0); | |
2828 | else | |
2829 | make_cleanup_freeargv (argv); | |
2830 | } | |
2831 | while (argv != NULL && *argv != NULL) | |
2832 | { | |
2833 | if (isdigit (argv[0][0])) | |
2834 | { | |
2835 | pid = strtoul (argv[0], NULL, 10); | |
2836 | } | |
2837 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
2838 | { | |
2839 | mappings_f = 1; | |
2840 | } | |
2841 | else if (strcmp (argv[0], "status") == 0) | |
2842 | { | |
2843 | status_f = 1; | |
2844 | } | |
2845 | else if (strcmp (argv[0], "stat") == 0) | |
2846 | { | |
2847 | stat_f = 1; | |
2848 | } | |
2849 | else if (strcmp (argv[0], "cmd") == 0) | |
2850 | { | |
2851 | cmdline_f = 1; | |
2852 | } | |
2853 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
2854 | { | |
2855 | exe_f = 1; | |
2856 | } | |
2857 | else if (strcmp (argv[0], "cwd") == 0) | |
2858 | { | |
2859 | cwd_f = 1; | |
2860 | } | |
2861 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
2862 | { | |
2863 | all = 1; | |
2864 | } | |
2865 | else | |
2866 | { | |
2867 | /* [...] (future options here) */ | |
2868 | } | |
2869 | argv++; | |
2870 | } | |
2871 | if (pid == 0) | |
8a3fe4f8 | 2872 | error (_("No current process: you must name one.")); |
dba24537 AC |
2873 | |
2874 | sprintf (fname1, "/proc/%lld", pid); | |
2875 | if (stat (fname1, &dummy) != 0) | |
8a3fe4f8 | 2876 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 2877 | |
a3f17187 | 2878 | printf_filtered (_("process %lld\n"), pid); |
dba24537 AC |
2879 | if (cmdline_f || all) |
2880 | { | |
2881 | sprintf (fname1, "/proc/%lld/cmdline", pid); | |
2882 | if ((procfile = fopen (fname1, "r")) > 0) | |
2883 | { | |
2884 | fgets (buffer, sizeof (buffer), procfile); | |
2885 | printf_filtered ("cmdline = '%s'\n", buffer); | |
2886 | fclose (procfile); | |
2887 | } | |
2888 | else | |
8a3fe4f8 | 2889 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
2890 | } |
2891 | if (cwd_f || all) | |
2892 | { | |
2893 | sprintf (fname1, "/proc/%lld/cwd", pid); | |
2894 | memset (fname2, 0, sizeof (fname2)); | |
2895 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
2896 | printf_filtered ("cwd = '%s'\n", fname2); | |
2897 | else | |
8a3fe4f8 | 2898 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
2899 | } |
2900 | if (exe_f || all) | |
2901 | { | |
2902 | sprintf (fname1, "/proc/%lld/exe", pid); | |
2903 | memset (fname2, 0, sizeof (fname2)); | |
2904 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
2905 | printf_filtered ("exe = '%s'\n", fname2); | |
2906 | else | |
8a3fe4f8 | 2907 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
2908 | } |
2909 | if (mappings_f || all) | |
2910 | { | |
2911 | sprintf (fname1, "/proc/%lld/maps", pid); | |
2912 | if ((procfile = fopen (fname1, "r")) > 0) | |
2913 | { | |
2914 | long long addr, endaddr, size, offset, inode; | |
2915 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
2916 | ||
a3f17187 | 2917 | printf_filtered (_("Mapped address spaces:\n\n")); |
dba24537 AC |
2918 | if (TARGET_ADDR_BIT == 32) |
2919 | { | |
2920 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
2921 | "Start Addr", | |
2922 | " End Addr", | |
2923 | " Size", " Offset", "objfile"); | |
2924 | } | |
2925 | else | |
2926 | { | |
2927 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
2928 | "Start Addr", | |
2929 | " End Addr", | |
2930 | " Size", " Offset", "objfile"); | |
2931 | } | |
2932 | ||
2933 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
2934 | &offset, &device[0], &inode, &filename[0])) | |
2935 | { | |
2936 | size = endaddr - addr; | |
2937 | ||
2938 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
2939 | calls here (and possibly above) should be abstracted | |
2940 | out into their own functions? Andrew suggests using | |
2941 | a generic local_address_string instead to print out | |
2942 | the addresses; that makes sense to me, too. */ | |
2943 | ||
2944 | if (TARGET_ADDR_BIT == 32) | |
2945 | { | |
2946 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
2947 | (unsigned long) addr, /* FIXME: pr_addr */ | |
2948 | (unsigned long) endaddr, | |
2949 | (int) size, | |
2950 | (unsigned int) offset, | |
2951 | filename[0] ? filename : ""); | |
2952 | } | |
2953 | else | |
2954 | { | |
2955 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
2956 | (unsigned long) addr, /* FIXME: pr_addr */ | |
2957 | (unsigned long) endaddr, | |
2958 | (int) size, | |
2959 | (unsigned int) offset, | |
2960 | filename[0] ? filename : ""); | |
2961 | } | |
2962 | } | |
2963 | ||
2964 | fclose (procfile); | |
2965 | } | |
2966 | else | |
8a3fe4f8 | 2967 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
2968 | } |
2969 | if (status_f || all) | |
2970 | { | |
2971 | sprintf (fname1, "/proc/%lld/status", pid); | |
2972 | if ((procfile = fopen (fname1, "r")) > 0) | |
2973 | { | |
2974 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) | |
2975 | puts_filtered (buffer); | |
2976 | fclose (procfile); | |
2977 | } | |
2978 | else | |
8a3fe4f8 | 2979 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
2980 | } |
2981 | if (stat_f || all) | |
2982 | { | |
2983 | sprintf (fname1, "/proc/%lld/stat", pid); | |
2984 | if ((procfile = fopen (fname1, "r")) > 0) | |
2985 | { | |
2986 | int itmp; | |
2987 | char ctmp; | |
2988 | ||
2989 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 2990 | printf_filtered (_("Process: %d\n"), itmp); |
dba24537 | 2991 | if (fscanf (procfile, "%s ", &buffer[0]) > 0) |
a3f17187 | 2992 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 2993 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 2994 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 2995 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 2996 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 2997 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 2998 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 2999 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3000 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 3001 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3002 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 3003 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3004 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
dba24537 | 3005 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 3006 | printf_filtered (_("Flags: 0x%x\n"), itmp); |
dba24537 | 3007 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 3008 | printf_filtered (_("Minor faults (no memory page): %u\n"), |
dba24537 AC |
3009 | (unsigned int) itmp); |
3010 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3011 | printf_filtered (_("Minor faults, children: %u\n"), |
dba24537 AC |
3012 | (unsigned int) itmp); |
3013 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3014 | printf_filtered (_("Major faults (memory page faults): %u\n"), |
dba24537 AC |
3015 | (unsigned int) itmp); |
3016 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3017 | printf_filtered (_("Major faults, children: %u\n"), |
dba24537 AC |
3018 | (unsigned int) itmp); |
3019 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
3020 | printf_filtered ("utime: %d\n", itmp); | |
3021 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
3022 | printf_filtered ("stime: %d\n", itmp); | |
3023 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
3024 | printf_filtered ("utime, children: %d\n", itmp); | |
3025 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
3026 | printf_filtered ("stime, children: %d\n", itmp); | |
3027 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 3028 | printf_filtered (_("jiffies remaining in current time slice: %d\n"), |
dba24537 AC |
3029 | itmp); |
3030 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
3031 | printf_filtered ("'nice' value: %d\n", itmp); | |
3032 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3033 | printf_filtered (_("jiffies until next timeout: %u\n"), |
dba24537 AC |
3034 | (unsigned int) itmp); |
3035 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
3036 | printf_filtered ("jiffies until next SIGALRM: %u\n", | |
3037 | (unsigned int) itmp); | |
3038 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 3039 | printf_filtered (_("start time (jiffies since system boot): %d\n"), |
dba24537 AC |
3040 | itmp); |
3041 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3042 | printf_filtered (_("Virtual memory size: %u\n"), |
dba24537 AC |
3043 | (unsigned int) itmp); |
3044 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3045 | printf_filtered (_("Resident set size: %u\n"), (unsigned int) itmp); |
dba24537 AC |
3046 | if (fscanf (procfile, "%u ", &itmp) > 0) |
3047 | printf_filtered ("rlim: %u\n", (unsigned int) itmp); | |
3048 | if (fscanf (procfile, "%u ", &itmp) > 0) | |
a3f17187 | 3049 | printf_filtered (_("Start of text: 0x%x\n"), itmp); |
dba24537 | 3050 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 3051 | printf_filtered (_("End of text: 0x%x\n"), itmp); |
dba24537 | 3052 | if (fscanf (procfile, "%u ", &itmp) > 0) |
a3f17187 | 3053 | printf_filtered (_("Start of stack: 0x%x\n"), itmp); |
dba24537 AC |
3054 | #if 0 /* Don't know how architecture-dependent the rest is... |
3055 | Anyway the signal bitmap info is available from "status". */ | |
3056 | if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ | |
a3f17187 | 3057 | printf_filtered (_("Kernel stack pointer: 0x%x\n"), itmp); |
dba24537 | 3058 | if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ |
a3f17187 | 3059 | printf_filtered (_("Kernel instr pointer: 0x%x\n"), itmp); |
dba24537 | 3060 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3061 | printf_filtered (_("Pending signals bitmap: 0x%x\n"), itmp); |
dba24537 | 3062 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3063 | printf_filtered (_("Blocked signals bitmap: 0x%x\n"), itmp); |
dba24537 | 3064 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3065 | printf_filtered (_("Ignored signals bitmap: 0x%x\n"), itmp); |
dba24537 | 3066 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3067 | printf_filtered (_("Catched signals bitmap: 0x%x\n"), itmp); |
dba24537 | 3068 | if (fscanf (procfile, "%u ", &itmp) > 0) /* FIXME arch? */ |
a3f17187 | 3069 | printf_filtered (_("wchan (system call): 0x%x\n"), itmp); |
dba24537 AC |
3070 | #endif |
3071 | fclose (procfile); | |
3072 | } | |
3073 | else | |
8a3fe4f8 | 3074 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3075 | } |
3076 | } | |
3077 | ||
10d6c8cd DJ |
3078 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
3079 | filesystem. Because we can use a single read() call for /proc, this | |
3080 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
3081 | but it doesn't support writes. */ | |
3082 | ||
3083 | static LONGEST | |
3084 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
3085 | const char *annex, gdb_byte *readbuf, | |
3086 | const gdb_byte *writebuf, | |
3087 | ULONGEST offset, LONGEST len) | |
dba24537 | 3088 | { |
10d6c8cd DJ |
3089 | LONGEST ret; |
3090 | int fd; | |
dba24537 AC |
3091 | char filename[64]; |
3092 | ||
10d6c8cd | 3093 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
3094 | return 0; |
3095 | ||
3096 | /* Don't bother for one word. */ | |
3097 | if (len < 3 * sizeof (long)) | |
3098 | return 0; | |
3099 | ||
3100 | /* We could keep this file open and cache it - possibly one per | |
3101 | thread. That requires some juggling, but is even faster. */ | |
3102 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
3103 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
3104 | if (fd == -1) | |
3105 | return 0; | |
3106 | ||
3107 | /* If pread64 is available, use it. It's faster if the kernel | |
3108 | supports it (only one syscall), and it's 64-bit safe even on | |
3109 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
3110 | application). */ | |
3111 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 3112 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 3113 | #else |
10d6c8cd | 3114 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
3115 | #endif |
3116 | ret = 0; | |
3117 | else | |
3118 | ret = len; | |
3119 | ||
3120 | close (fd); | |
3121 | return ret; | |
3122 | } | |
3123 | ||
3124 | /* Parse LINE as a signal set and add its set bits to SIGS. */ | |
3125 | ||
3126 | static void | |
3127 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
3128 | { | |
3129 | int len = strlen (line) - 1; | |
3130 | const char *p; | |
3131 | int signum; | |
3132 | ||
3133 | if (line[len] != '\n') | |
8a3fe4f8 | 3134 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
3135 | |
3136 | p = line; | |
3137 | signum = len * 4; | |
3138 | while (len-- > 0) | |
3139 | { | |
3140 | int digit; | |
3141 | ||
3142 | if (*p >= '0' && *p <= '9') | |
3143 | digit = *p - '0'; | |
3144 | else if (*p >= 'a' && *p <= 'f') | |
3145 | digit = *p - 'a' + 10; | |
3146 | else | |
8a3fe4f8 | 3147 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
3148 | |
3149 | signum -= 4; | |
3150 | ||
3151 | if (digit & 1) | |
3152 | sigaddset (sigs, signum + 1); | |
3153 | if (digit & 2) | |
3154 | sigaddset (sigs, signum + 2); | |
3155 | if (digit & 4) | |
3156 | sigaddset (sigs, signum + 3); | |
3157 | if (digit & 8) | |
3158 | sigaddset (sigs, signum + 4); | |
3159 | ||
3160 | p++; | |
3161 | } | |
3162 | } | |
3163 | ||
3164 | /* Find process PID's pending signals from /proc/pid/status and set | |
3165 | SIGS to match. */ | |
3166 | ||
3167 | void | |
3168 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
3169 | { | |
3170 | FILE *procfile; | |
3171 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
3172 | int signum; | |
3173 | ||
3174 | sigemptyset (pending); | |
3175 | sigemptyset (blocked); | |
3176 | sigemptyset (ignored); | |
3177 | sprintf (fname, "/proc/%d/status", pid); | |
3178 | procfile = fopen (fname, "r"); | |
3179 | if (procfile == NULL) | |
8a3fe4f8 | 3180 | error (_("Could not open %s"), fname); |
dba24537 AC |
3181 | |
3182 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
3183 | { | |
3184 | /* Normal queued signals are on the SigPnd line in the status | |
3185 | file. However, 2.6 kernels also have a "shared" pending | |
3186 | queue for delivering signals to a thread group, so check for | |
3187 | a ShdPnd line also. | |
3188 | ||
3189 | Unfortunately some Red Hat kernels include the shared pending | |
3190 | queue but not the ShdPnd status field. */ | |
3191 | ||
3192 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
3193 | add_line_to_sigset (buffer + 8, pending); | |
3194 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
3195 | add_line_to_sigset (buffer + 8, pending); | |
3196 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
3197 | add_line_to_sigset (buffer + 8, blocked); | |
3198 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
3199 | add_line_to_sigset (buffer + 8, ignored); | |
3200 | } | |
3201 | ||
3202 | fclose (procfile); | |
3203 | } | |
3204 | ||
10d6c8cd DJ |
3205 | static LONGEST |
3206 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
3207 | const char *annex, gdb_byte *readbuf, | |
3208 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3209 | { | |
3210 | LONGEST xfer; | |
3211 | ||
3212 | if (object == TARGET_OBJECT_AUXV) | |
3213 | return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf, | |
3214 | offset, len); | |
3215 | ||
3216 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, | |
3217 | offset, len); | |
3218 | if (xfer != 0) | |
3219 | return xfer; | |
3220 | ||
3221 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
3222 | offset, len); | |
3223 | } | |
3224 | ||
3225 | #ifndef FETCH_INFERIOR_REGISTERS | |
3226 | ||
3227 | /* Return the address in the core dump or inferior of register | |
3228 | REGNO. */ | |
3229 | ||
3230 | static CORE_ADDR | |
3231 | linux_register_u_offset (int regno) | |
3232 | { | |
3233 | /* FIXME drow/2005-09-04: The hardcoded use of register_addr should go | |
3234 | away. This requires disentangling the various definitions of it | |
3235 | (particularly alpha-nat.c's). */ | |
3236 | return register_addr (regno, 0); | |
3237 | } | |
3238 | ||
3239 | #endif | |
3240 | ||
3241 | /* Create a prototype generic Linux target. The client can override | |
3242 | it with local methods. */ | |
3243 | ||
3244 | struct target_ops * | |
3245 | linux_target (void) | |
3246 | { | |
3247 | struct target_ops *t; | |
3248 | ||
3249 | #ifdef FETCH_INFERIOR_REGISTERS | |
3250 | t = inf_ptrace_target (); | |
3251 | #else | |
3252 | t = inf_ptrace_trad_target (linux_register_u_offset); | |
3253 | #endif | |
3254 | t->to_wait = child_wait; | |
3255 | t->to_kill = kill_inferior; | |
3256 | t->to_insert_fork_catchpoint = child_insert_fork_catchpoint; | |
3257 | t->to_insert_vfork_catchpoint = child_insert_vfork_catchpoint; | |
3258 | t->to_insert_exec_catchpoint = child_insert_exec_catchpoint; | |
3259 | t->to_pid_to_exec_file = child_pid_to_exec_file; | |
3260 | t->to_post_startup_inferior = linux_child_post_startup_inferior; | |
3261 | t->to_post_attach = child_post_attach; | |
3262 | t->to_follow_fork = child_follow_fork; | |
3263 | t->to_find_memory_regions = linux_nat_find_memory_regions; | |
3264 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
3265 | ||
3266 | super_xfer_partial = t->to_xfer_partial; | |
3267 | t->to_xfer_partial = linux_xfer_partial; | |
3268 | ||
ac264b3b MS |
3269 | super_mourn_inferior = t->to_mourn_inferior; |
3270 | t->to_mourn_inferior = child_mourn_inferior; | |
3271 | ||
10d6c8cd DJ |
3272 | linux_ops = t; |
3273 | return t; | |
3274 | } | |
3275 | ||
d6b0e80f AC |
3276 | void |
3277 | _initialize_linux_nat (void) | |
3278 | { | |
3279 | struct sigaction action; | |
d6b0e80f | 3280 | extern void thread_db_init (struct target_ops *); |
dba24537 | 3281 | |
1bedd215 AC |
3282 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
3283 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
3284 | Specify any process id, or use the program being debugged by default.\n\ |
3285 | Specify any of the following keywords for detailed info:\n\ | |
3286 | mappings -- list of mapped memory regions.\n\ | |
3287 | stat -- list a bunch of random process info.\n\ | |
3288 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 3289 | all -- list all available /proc info.")); |
d6b0e80f AC |
3290 | |
3291 | init_linux_nat_ops (); | |
3292 | add_target (&linux_nat_ops); | |
3293 | thread_db_init (&linux_nat_ops); | |
3294 | ||
3295 | /* Save the original signal mask. */ | |
3296 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); | |
3297 | ||
3298 | action.sa_handler = sigchld_handler; | |
3299 | sigemptyset (&action.sa_mask); | |
58aecb61 | 3300 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
3301 | sigaction (SIGCHLD, &action, NULL); |
3302 | ||
3303 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
3304 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
3305 | sigdelset (&suspend_mask, SIGCHLD); | |
3306 | ||
3307 | sigemptyset (&blocked_mask); | |
3308 | ||
85c07804 AC |
3309 | add_setshow_zinteger_cmd ("lin-lwp", no_class, &debug_linux_nat, _("\ |
3310 | Set debugging of GNU/Linux lwp module."), _("\ | |
3311 | Show debugging of GNU/Linux lwp module."), _("\ | |
3312 | Enables printf debugging output."), | |
3313 | NULL, | |
920d2a44 | 3314 | show_debug_linux_nat, |
85c07804 | 3315 | &setdebuglist, &showdebuglist); |
d6b0e80f AC |
3316 | } |
3317 | \f | |
3318 | ||
3319 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
3320 | the GNU/Linux Threads library and therefore doesn't really belong | |
3321 | here. */ | |
3322 | ||
3323 | /* Read variable NAME in the target and return its value if found. | |
3324 | Otherwise return zero. It is assumed that the type of the variable | |
3325 | is `int'. */ | |
3326 | ||
3327 | static int | |
3328 | get_signo (const char *name) | |
3329 | { | |
3330 | struct minimal_symbol *ms; | |
3331 | int signo; | |
3332 | ||
3333 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
3334 | if (ms == NULL) | |
3335 | return 0; | |
3336 | ||
8e70166d | 3337 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
3338 | sizeof (signo)) != 0) |
3339 | return 0; | |
3340 | ||
3341 | return signo; | |
3342 | } | |
3343 | ||
3344 | /* Return the set of signals used by the threads library in *SET. */ | |
3345 | ||
3346 | void | |
3347 | lin_thread_get_thread_signals (sigset_t *set) | |
3348 | { | |
3349 | struct sigaction action; | |
3350 | int restart, cancel; | |
3351 | ||
3352 | sigemptyset (set); | |
3353 | ||
3354 | restart = get_signo ("__pthread_sig_restart"); | |
3355 | if (restart == 0) | |
3356 | return; | |
3357 | ||
3358 | cancel = get_signo ("__pthread_sig_cancel"); | |
3359 | if (cancel == 0) | |
3360 | return; | |
3361 | ||
3362 | sigaddset (set, restart); | |
3363 | sigaddset (set, cancel); | |
3364 | ||
3365 | /* The GNU/Linux Threads library makes terminating threads send a | |
3366 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
3367 | those (to prevent them from terminating GDB itself, which is | |
3368 | likely to be their default action) and treat them the same way as | |
3369 | SIGCHLD. */ | |
3370 | ||
3371 | action.sa_handler = sigchld_handler; | |
3372 | sigemptyset (&action.sa_mask); | |
58aecb61 | 3373 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
3374 | sigaction (cancel, &action, NULL); |
3375 | ||
3376 | /* We block the "cancel" signal throughout this code ... */ | |
3377 | sigaddset (&blocked_mask, cancel); | |
3378 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
3379 | ||
3380 | /* ... except during a sigsuspend. */ | |
3381 | sigdelset (&suspend_mask, cancel); | |
3382 | } | |
ac264b3b | 3383 |