Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
545587ee | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
9b254dd1 | 3 | 2006, 2007, 2008 Free Software Foundation, Inc. |
da6d8c04 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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
19 | |
20 | #include "server.h" | |
58caa3dc | 21 | #include "linux-low.h" |
da6d8c04 | 22 | |
58caa3dc | 23 | #include <sys/wait.h> |
da6d8c04 DJ |
24 | #include <stdio.h> |
25 | #include <sys/param.h> | |
da6d8c04 | 26 | #include <sys/ptrace.h> |
da6d8c04 DJ |
27 | #include <signal.h> |
28 | #include <sys/ioctl.h> | |
29 | #include <fcntl.h> | |
d07c63e7 | 30 | #include <string.h> |
0a30fbc4 DJ |
31 | #include <stdlib.h> |
32 | #include <unistd.h> | |
fa6a77dc | 33 | #include <errno.h> |
fd500816 | 34 | #include <sys/syscall.h> |
f9387fc3 | 35 | #include <sched.h> |
07e059b5 VP |
36 | #include <ctype.h> |
37 | #include <pwd.h> | |
38 | #include <sys/types.h> | |
39 | #include <dirent.h> | |
da6d8c04 | 40 | |
32ca6d61 DJ |
41 | #ifndef PTRACE_GETSIGINFO |
42 | # define PTRACE_GETSIGINFO 0x4202 | |
43 | # define PTRACE_SETSIGINFO 0x4203 | |
44 | #endif | |
45 | ||
fd462a61 DJ |
46 | #ifndef O_LARGEFILE |
47 | #define O_LARGEFILE 0 | |
48 | #endif | |
49 | ||
24a09b5f DJ |
50 | /* If the system headers did not provide the constants, hard-code the normal |
51 | values. */ | |
52 | #ifndef PTRACE_EVENT_FORK | |
53 | ||
54 | #define PTRACE_SETOPTIONS 0x4200 | |
55 | #define PTRACE_GETEVENTMSG 0x4201 | |
56 | ||
57 | /* options set using PTRACE_SETOPTIONS */ | |
58 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
59 | #define PTRACE_O_TRACEFORK 0x00000002 | |
60 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
61 | #define PTRACE_O_TRACECLONE 0x00000008 | |
62 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
63 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 | |
64 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
65 | ||
66 | /* Wait extended result codes for the above trace options. */ | |
67 | #define PTRACE_EVENT_FORK 1 | |
68 | #define PTRACE_EVENT_VFORK 2 | |
69 | #define PTRACE_EVENT_CLONE 3 | |
70 | #define PTRACE_EVENT_EXEC 4 | |
71 | #define PTRACE_EVENT_VFORK_DONE 5 | |
72 | #define PTRACE_EVENT_EXIT 6 | |
73 | ||
74 | #endif /* PTRACE_EVENT_FORK */ | |
75 | ||
76 | /* We can't always assume that this flag is available, but all systems | |
77 | with the ptrace event handlers also have __WALL, so it's safe to use | |
78 | in some contexts. */ | |
79 | #ifndef __WALL | |
80 | #define __WALL 0x40000000 /* Wait for any child. */ | |
81 | #endif | |
82 | ||
42c81e2a DJ |
83 | #ifdef __UCLIBC__ |
84 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
85 | #define HAS_NOMMU | |
86 | #endif | |
87 | #endif | |
88 | ||
24a09b5f DJ |
89 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
90 | representation of the thread ID. | |
611cb4a5 | 91 | |
0d62e5e8 DJ |
92 | ``all_processes'' is keyed by the process ID - which on Linux is (presently) |
93 | the same as the LWP ID. */ | |
94 | ||
95 | struct inferior_list all_processes; | |
96 | ||
24a09b5f DJ |
97 | /* A list of all unknown processes which receive stop signals. Some other |
98 | process will presumably claim each of these as forked children | |
99 | momentarily. */ | |
100 | ||
101 | struct inferior_list stopped_pids; | |
102 | ||
0d62e5e8 DJ |
103 | /* FIXME this is a bit of a hack, and could be removed. */ |
104 | int stopping_threads; | |
105 | ||
106 | /* FIXME make into a target method? */ | |
24a09b5f DJ |
107 | int using_threads = 1; |
108 | static int thread_db_active; | |
109 | ||
110 | static int must_set_ptrace_flags; | |
0d62e5e8 | 111 | |
d61ddec4 UW |
112 | /* This flag is true iff we've just created or attached to a new inferior |
113 | but it has not stopped yet. As soon as it does, we need to call the | |
114 | low target's arch_setup callback. */ | |
115 | static int new_inferior; | |
116 | ||
0d62e5e8 | 117 | static void linux_resume_one_process (struct inferior_list_entry *entry, |
32ca6d61 | 118 | int step, int signal, siginfo_t *info); |
64386c31 | 119 | static void linux_resume (struct thread_resume *resume_info); |
0d62e5e8 DJ |
120 | static void stop_all_processes (void); |
121 | static int linux_wait_for_event (struct thread_info *child); | |
ae13219e | 122 | static int check_removed_breakpoint (struct process_info *event_child); |
24a09b5f | 123 | static void *add_process (unsigned long pid); |
97438e3f | 124 | static int my_waitpid (int pid, int *status, int flags); |
0d62e5e8 DJ |
125 | |
126 | struct pending_signals | |
127 | { | |
128 | int signal; | |
32ca6d61 | 129 | siginfo_t info; |
0d62e5e8 DJ |
130 | struct pending_signals *prev; |
131 | }; | |
611cb4a5 | 132 | |
d844cde6 | 133 | #define PTRACE_ARG3_TYPE long |
c6ecbae5 | 134 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 135 | |
58caa3dc | 136 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
137 | static char *disabled_regsets; |
138 | static int num_regsets; | |
58caa3dc DJ |
139 | #endif |
140 | ||
0d62e5e8 DJ |
141 | #define pid_of(proc) ((proc)->head.id) |
142 | ||
143 | /* FIXME: Delete eventually. */ | |
144 | #define inferior_pid (pid_of (get_thread_process (current_inferior))) | |
145 | ||
24a09b5f DJ |
146 | static void |
147 | handle_extended_wait (struct process_info *event_child, int wstat) | |
148 | { | |
149 | int event = wstat >> 16; | |
150 | struct process_info *new_process; | |
151 | ||
152 | if (event == PTRACE_EVENT_CLONE) | |
153 | { | |
154 | unsigned long new_pid; | |
836acd6d | 155 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f DJ |
156 | |
157 | ptrace (PTRACE_GETEVENTMSG, inferior_pid, 0, &new_pid); | |
158 | ||
159 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
160 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
161 | { | |
162 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
163 | hits the SIGSTOP, but we're already attached. */ | |
164 | ||
97438e3f | 165 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
166 | |
167 | if (ret == -1) | |
168 | perror_with_name ("waiting for new child"); | |
169 | else if (ret != new_pid) | |
170 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 171 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
172 | warning ("wait returned unexpected status 0x%x", status); |
173 | } | |
174 | ||
175 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE); | |
176 | ||
177 | new_process = (struct process_info *) add_process (new_pid); | |
178 | add_thread (new_pid, new_process, new_pid); | |
179 | new_thread_notify (thread_id_to_gdb_id (new_process->lwpid)); | |
180 | ||
da5898ce DJ |
181 | /* Normally we will get the pending SIGSTOP. But in some cases |
182 | we might get another signal delivered to the group first. | |
183 | If we do, be sure not to lose it. */ | |
184 | if (WSTOPSIG (status) == SIGSTOP) | |
185 | { | |
186 | if (stopping_threads) | |
187 | new_process->stopped = 1; | |
188 | else | |
189 | ptrace (PTRACE_CONT, new_pid, 0, 0); | |
190 | } | |
24a09b5f | 191 | else |
da5898ce DJ |
192 | { |
193 | new_process->stop_expected = 1; | |
194 | if (stopping_threads) | |
195 | { | |
196 | new_process->stopped = 1; | |
197 | new_process->status_pending_p = 1; | |
198 | new_process->status_pending = status; | |
199 | } | |
200 | else | |
201 | /* Pass the signal on. This is what GDB does - except | |
202 | shouldn't we really report it instead? */ | |
203 | ptrace (PTRACE_CONT, new_pid, 0, WSTOPSIG (status)); | |
204 | } | |
24a09b5f DJ |
205 | |
206 | /* Always resume the current thread. If we are stopping | |
207 | threads, it will have a pending SIGSTOP; we may as well | |
208 | collect it now. */ | |
209 | linux_resume_one_process (&event_child->head, | |
210 | event_child->stepping, 0, NULL); | |
211 | } | |
212 | } | |
213 | ||
0d62e5e8 DJ |
214 | /* This function should only be called if the process got a SIGTRAP. |
215 | The SIGTRAP could mean several things. | |
216 | ||
217 | On i386, where decr_pc_after_break is non-zero: | |
218 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
219 | we will get only the one SIGTRAP (even if the instruction we | |
220 | stepped over was a breakpoint). The value of $eip will be the | |
221 | next instruction. | |
222 | If we continue the process using PTRACE_CONT, we will get a | |
223 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
224 | the instruction after the breakpoint (i.e. needs to be | |
225 | decremented). If we report the SIGTRAP to GDB, we must also | |
226 | report the undecremented PC. If we cancel the SIGTRAP, we | |
227 | must resume at the decremented PC. | |
228 | ||
229 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
230 | with hardware or kernel single-step: | |
231 | If we single-step over a breakpoint instruction, our PC will | |
232 | point at the following instruction. If we continue and hit a | |
233 | breakpoint instruction, our PC will point at the breakpoint | |
234 | instruction. */ | |
235 | ||
236 | static CORE_ADDR | |
237 | get_stop_pc (void) | |
238 | { | |
239 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
240 | ||
241 | if (get_thread_process (current_inferior)->stepping) | |
242 | return stop_pc; | |
243 | else | |
244 | return stop_pc - the_low_target.decr_pc_after_break; | |
245 | } | |
ce3a066d | 246 | |
0d62e5e8 | 247 | static void * |
a1928bad | 248 | add_process (unsigned long pid) |
611cb4a5 | 249 | { |
0d62e5e8 DJ |
250 | struct process_info *process; |
251 | ||
bca929d3 | 252 | process = (struct process_info *) xmalloc (sizeof (*process)); |
0d62e5e8 DJ |
253 | memset (process, 0, sizeof (*process)); |
254 | ||
255 | process->head.id = pid; | |
0d62e5e8 DJ |
256 | process->lwpid = pid; |
257 | ||
258 | add_inferior_to_list (&all_processes, &process->head); | |
259 | ||
260 | return process; | |
261 | } | |
611cb4a5 | 262 | |
da6d8c04 DJ |
263 | /* Start an inferior process and returns its pid. |
264 | ALLARGS is a vector of program-name and args. */ | |
265 | ||
ce3a066d DJ |
266 | static int |
267 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 268 | { |
0d62e5e8 | 269 | void *new_process; |
da6d8c04 DJ |
270 | int pid; |
271 | ||
42c81e2a | 272 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
273 | pid = vfork (); |
274 | #else | |
da6d8c04 | 275 | pid = fork (); |
52fb6437 | 276 | #endif |
da6d8c04 DJ |
277 | if (pid < 0) |
278 | perror_with_name ("fork"); | |
279 | ||
280 | if (pid == 0) | |
281 | { | |
282 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
283 | ||
254787d4 | 284 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 285 | |
a9fa9f7d DJ |
286 | setpgid (0, 0); |
287 | ||
2b876972 DJ |
288 | execv (program, allargs); |
289 | if (errno == ENOENT) | |
290 | execvp (program, allargs); | |
da6d8c04 DJ |
291 | |
292 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 293 | strerror (errno)); |
da6d8c04 DJ |
294 | fflush (stderr); |
295 | _exit (0177); | |
296 | } | |
297 | ||
0d62e5e8 | 298 | new_process = add_process (pid); |
a06660f7 | 299 | add_thread (pid, new_process, pid); |
24a09b5f | 300 | must_set_ptrace_flags = 1; |
d61ddec4 | 301 | new_inferior = 1; |
611cb4a5 | 302 | |
a9fa9f7d | 303 | return pid; |
da6d8c04 DJ |
304 | } |
305 | ||
306 | /* Attach to an inferior process. */ | |
307 | ||
0d62e5e8 | 308 | void |
24a09b5f | 309 | linux_attach_lwp (unsigned long pid) |
da6d8c04 | 310 | { |
0d62e5e8 | 311 | struct process_info *new_process; |
611cb4a5 | 312 | |
da6d8c04 DJ |
313 | if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0) |
314 | { | |
2d717e4f DJ |
315 | if (all_threads.head != NULL) |
316 | { | |
317 | /* If we fail to attach to an LWP, just warn. */ | |
318 | fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid, | |
319 | strerror (errno), errno); | |
320 | fflush (stderr); | |
321 | return; | |
322 | } | |
323 | else | |
324 | /* If we fail to attach to a process, report an error. */ | |
325 | error ("Cannot attach to process %ld: %s (%d)\n", pid, | |
43d5792c | 326 | strerror (errno), errno); |
da6d8c04 DJ |
327 | } |
328 | ||
24a09b5f DJ |
329 | ptrace (PTRACE_SETOPTIONS, pid, 0, PTRACE_O_TRACECLONE); |
330 | ||
0d62e5e8 | 331 | new_process = (struct process_info *) add_process (pid); |
24a09b5f DJ |
332 | add_thread (pid, new_process, pid); |
333 | new_thread_notify (thread_id_to_gdb_id (new_process->lwpid)); | |
0d62e5e8 DJ |
334 | |
335 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH | |
336 | brings it to a halt. We should ignore that SIGSTOP and resume the process | |
337 | (unless this is the first process, in which case the flag will be cleared | |
338 | in linux_attach). | |
339 | ||
340 | On the other hand, if we are currently trying to stop all threads, we | |
341 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
342 | because we are guaranteed that add_process added us to the end of the | |
343 | list, and so the new thread has not yet reached wait_for_sigstop (but | |
344 | will). */ | |
345 | if (! stopping_threads) | |
346 | new_process->stop_expected = 1; | |
347 | } | |
348 | ||
349 | int | |
a1928bad | 350 | linux_attach (unsigned long pid) |
0d62e5e8 DJ |
351 | { |
352 | struct process_info *process; | |
353 | ||
24a09b5f | 354 | linux_attach_lwp (pid); |
0d62e5e8 | 355 | |
ae13219e DJ |
356 | /* Don't ignore the initial SIGSTOP if we just attached to this process. |
357 | It will be collected by wait shortly. */ | |
0d62e5e8 DJ |
358 | process = (struct process_info *) find_inferior_id (&all_processes, pid); |
359 | process->stop_expected = 0; | |
360 | ||
d61ddec4 UW |
361 | new_inferior = 1; |
362 | ||
da6d8c04 DJ |
363 | return 0; |
364 | } | |
365 | ||
366 | /* Kill the inferior process. Make us have no inferior. */ | |
367 | ||
ce3a066d | 368 | static void |
0d62e5e8 | 369 | linux_kill_one_process (struct inferior_list_entry *entry) |
da6d8c04 | 370 | { |
0d62e5e8 DJ |
371 | struct thread_info *thread = (struct thread_info *) entry; |
372 | struct process_info *process = get_thread_process (thread); | |
373 | int wstat; | |
374 | ||
fd500816 DJ |
375 | /* We avoid killing the first thread here, because of a Linux kernel (at |
376 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
377 | the children get a chance to be reaped, it will remain a zombie | |
378 | forever. */ | |
379 | if (entry == all_threads.head) | |
380 | return; | |
381 | ||
0d62e5e8 DJ |
382 | do |
383 | { | |
384 | ptrace (PTRACE_KILL, pid_of (process), 0, 0); | |
385 | ||
386 | /* Make sure it died. The loop is most likely unnecessary. */ | |
387 | wstat = linux_wait_for_event (thread); | |
388 | } while (WIFSTOPPED (wstat)); | |
da6d8c04 DJ |
389 | } |
390 | ||
0d62e5e8 DJ |
391 | static void |
392 | linux_kill (void) | |
393 | { | |
fd500816 | 394 | struct thread_info *thread = (struct thread_info *) all_threads.head; |
9d606399 | 395 | struct process_info *process; |
fd500816 DJ |
396 | int wstat; |
397 | ||
9d606399 DJ |
398 | if (thread == NULL) |
399 | return; | |
400 | ||
0d62e5e8 | 401 | for_each_inferior (&all_threads, linux_kill_one_process); |
fd500816 DJ |
402 | |
403 | /* See the comment in linux_kill_one_process. We did not kill the first | |
404 | thread in the list, so do so now. */ | |
9d606399 | 405 | process = get_thread_process (thread); |
fd500816 DJ |
406 | do |
407 | { | |
408 | ptrace (PTRACE_KILL, pid_of (process), 0, 0); | |
409 | ||
410 | /* Make sure it died. The loop is most likely unnecessary. */ | |
411 | wstat = linux_wait_for_event (thread); | |
412 | } while (WIFSTOPPED (wstat)); | |
2d717e4f DJ |
413 | |
414 | clear_inferiors (); | |
415 | free (all_processes.head); | |
416 | all_processes.head = all_processes.tail = NULL; | |
0d62e5e8 DJ |
417 | } |
418 | ||
6ad8ae5c DJ |
419 | static void |
420 | linux_detach_one_process (struct inferior_list_entry *entry) | |
421 | { | |
422 | struct thread_info *thread = (struct thread_info *) entry; | |
423 | struct process_info *process = get_thread_process (thread); | |
424 | ||
ae13219e DJ |
425 | /* Make sure the process isn't stopped at a breakpoint that's |
426 | no longer there. */ | |
427 | check_removed_breakpoint (process); | |
428 | ||
429 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
430 | sure we take care of that now. This isn't absolutely guaranteed | |
431 | to collect the SIGSTOP, but is fairly likely to. */ | |
432 | if (process->stop_expected) | |
433 | { | |
434 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ | |
435 | process->stop_expected = 0; | |
436 | if (process->stopped) | |
437 | linux_resume_one_process (&process->head, 0, 0, NULL); | |
438 | linux_wait_for_event (thread); | |
439 | } | |
440 | ||
441 | /* Flush any pending changes to the process's registers. */ | |
442 | regcache_invalidate_one ((struct inferior_list_entry *) | |
443 | get_process_thread (process)); | |
444 | ||
445 | /* Finally, let it resume. */ | |
6ad8ae5c DJ |
446 | ptrace (PTRACE_DETACH, pid_of (process), 0, 0); |
447 | } | |
448 | ||
dd6953e1 | 449 | static int |
6ad8ae5c DJ |
450 | linux_detach (void) |
451 | { | |
ae13219e | 452 | delete_all_breakpoints (); |
6ad8ae5c | 453 | for_each_inferior (&all_threads, linux_detach_one_process); |
ae13219e | 454 | clear_inferiors (); |
2d717e4f DJ |
455 | free (all_processes.head); |
456 | all_processes.head = all_processes.tail = NULL; | |
dd6953e1 | 457 | return 0; |
6ad8ae5c DJ |
458 | } |
459 | ||
444d6139 PA |
460 | static void |
461 | linux_join (void) | |
462 | { | |
463 | extern unsigned long signal_pid; | |
464 | int status, ret; | |
465 | ||
466 | do { | |
467 | ret = waitpid (signal_pid, &status, 0); | |
468 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
469 | break; | |
470 | } while (ret != -1 || errno != ECHILD); | |
471 | } | |
472 | ||
6ad8ae5c | 473 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 474 | static int |
24a09b5f | 475 | linux_thread_alive (unsigned long lwpid) |
0d62e5e8 | 476 | { |
24a09b5f | 477 | if (find_inferior_id (&all_threads, lwpid) != NULL) |
0d62e5e8 DJ |
478 | return 1; |
479 | else | |
480 | return 0; | |
481 | } | |
482 | ||
483 | /* Return nonzero if this process stopped at a breakpoint which | |
484 | no longer appears to be inserted. Also adjust the PC | |
485 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 486 | static int |
0d62e5e8 | 487 | check_removed_breakpoint (struct process_info *event_child) |
da6d8c04 | 488 | { |
0d62e5e8 DJ |
489 | CORE_ADDR stop_pc; |
490 | struct thread_info *saved_inferior; | |
491 | ||
492 | if (event_child->pending_is_breakpoint == 0) | |
493 | return 0; | |
494 | ||
495 | if (debug_threads) | |
ae13219e DJ |
496 | fprintf (stderr, "Checking for breakpoint in process %ld.\n", |
497 | event_child->lwpid); | |
0d62e5e8 DJ |
498 | |
499 | saved_inferior = current_inferior; | |
500 | current_inferior = get_process_thread (event_child); | |
501 | ||
502 | stop_pc = get_stop_pc (); | |
503 | ||
504 | /* If the PC has changed since we stopped, then we shouldn't do | |
505 | anything. This happens if, for instance, GDB handled the | |
506 | decr_pc_after_break subtraction itself. */ | |
507 | if (stop_pc != event_child->pending_stop_pc) | |
508 | { | |
509 | if (debug_threads) | |
ae13219e DJ |
510 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
511 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
512 | |
513 | event_child->pending_is_breakpoint = 0; | |
514 | current_inferior = saved_inferior; | |
515 | return 0; | |
516 | } | |
517 | ||
518 | /* If the breakpoint is still there, we will report hitting it. */ | |
519 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
520 | { | |
521 | if (debug_threads) | |
522 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
523 | current_inferior = saved_inferior; | |
524 | return 0; | |
525 | } | |
526 | ||
527 | if (debug_threads) | |
528 | fprintf (stderr, "Removed breakpoint.\n"); | |
529 | ||
530 | /* For decr_pc_after_break targets, here is where we perform the | |
531 | decrement. We go immediately from this function to resuming, | |
532 | and can not safely call get_stop_pc () again. */ | |
533 | if (the_low_target.set_pc != NULL) | |
534 | (*the_low_target.set_pc) (stop_pc); | |
535 | ||
536 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 537 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
538 | event_child->status_pending_p = 0; |
539 | event_child->status_pending = 0; | |
540 | ||
541 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
542 | return 1; |
543 | } | |
544 | ||
0d62e5e8 DJ |
545 | /* Return 1 if this process has an interesting status pending. This function |
546 | may silently resume an inferior process. */ | |
611cb4a5 | 547 | static int |
0d62e5e8 DJ |
548 | status_pending_p (struct inferior_list_entry *entry, void *dummy) |
549 | { | |
550 | struct process_info *process = (struct process_info *) entry; | |
551 | ||
552 | if (process->status_pending_p) | |
553 | if (check_removed_breakpoint (process)) | |
554 | { | |
555 | /* This thread was stopped at a breakpoint, and the breakpoint | |
556 | is now gone. We were told to continue (or step...) all threads, | |
557 | so GDB isn't trying to single-step past this breakpoint. | |
558 | So instead of reporting the old SIGTRAP, pretend we got to | |
559 | the breakpoint just after it was removed instead of just | |
560 | before; resume the process. */ | |
32ca6d61 | 561 | linux_resume_one_process (&process->head, 0, 0, NULL); |
0d62e5e8 DJ |
562 | return 0; |
563 | } | |
564 | ||
565 | return process->status_pending_p; | |
566 | } | |
567 | ||
568 | static void | |
569 | linux_wait_for_process (struct process_info **childp, int *wstatp) | |
611cb4a5 | 570 | { |
0d62e5e8 DJ |
571 | int ret; |
572 | int to_wait_for = -1; | |
573 | ||
574 | if (*childp != NULL) | |
575 | to_wait_for = (*childp)->lwpid; | |
611cb4a5 | 576 | |
24a09b5f | 577 | retry: |
611cb4a5 DJ |
578 | while (1) |
579 | { | |
0d62e5e8 DJ |
580 | ret = waitpid (to_wait_for, wstatp, WNOHANG); |
581 | ||
582 | if (ret == -1) | |
583 | { | |
584 | if (errno != ECHILD) | |
585 | perror_with_name ("waitpid"); | |
586 | } | |
587 | else if (ret > 0) | |
588 | break; | |
589 | ||
590 | ret = waitpid (to_wait_for, wstatp, WNOHANG | __WCLONE); | |
591 | ||
592 | if (ret == -1) | |
593 | { | |
594 | if (errno != ECHILD) | |
595 | perror_with_name ("waitpid (WCLONE)"); | |
596 | } | |
597 | else if (ret > 0) | |
598 | break; | |
599 | ||
600 | usleep (1000); | |
601 | } | |
602 | ||
603 | if (debug_threads | |
604 | && (!WIFSTOPPED (*wstatp) | |
605 | || (WSTOPSIG (*wstatp) != 32 | |
606 | && WSTOPSIG (*wstatp) != 33))) | |
607 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
608 | ||
609 | if (to_wait_for == -1) | |
610 | *childp = (struct process_info *) find_inferior_id (&all_processes, ret); | |
611 | ||
24a09b5f DJ |
612 | /* If we didn't find a process, one of two things presumably happened: |
613 | - A process we started and then detached from has exited. Ignore it. | |
614 | - A process we are controlling has forked and the new child's stop | |
615 | was reported to us by the kernel. Save its PID. */ | |
616 | if (*childp == NULL && WIFSTOPPED (*wstatp)) | |
617 | { | |
618 | add_pid_to_list (&stopped_pids, ret); | |
619 | goto retry; | |
620 | } | |
621 | else if (*childp == NULL) | |
622 | goto retry; | |
623 | ||
0d62e5e8 DJ |
624 | (*childp)->stopped = 1; |
625 | (*childp)->pending_is_breakpoint = 0; | |
626 | ||
32ca6d61 DJ |
627 | (*childp)->last_status = *wstatp; |
628 | ||
d61ddec4 UW |
629 | /* Architecture-specific setup after inferior is running. |
630 | This needs to happen after we have attached to the inferior | |
631 | and it is stopped for the first time, but before we access | |
632 | any inferior registers. */ | |
633 | if (new_inferior) | |
634 | { | |
635 | the_low_target.arch_setup (); | |
52fa2412 UW |
636 | #ifdef HAVE_LINUX_REGSETS |
637 | memset (disabled_regsets, 0, num_regsets); | |
638 | #endif | |
d61ddec4 UW |
639 | new_inferior = 0; |
640 | } | |
641 | ||
0d62e5e8 DJ |
642 | if (debug_threads |
643 | && WIFSTOPPED (*wstatp)) | |
644 | { | |
896c7fbb | 645 | struct thread_info *saved_inferior = current_inferior; |
0d62e5e8 | 646 | current_inferior = (struct thread_info *) |
24a09b5f | 647 | find_inferior_id (&all_threads, (*childp)->lwpid); |
0d62e5e8 DJ |
648 | /* For testing only; i386_stop_pc prints out a diagnostic. */ |
649 | if (the_low_target.get_pc != NULL) | |
650 | get_stop_pc (); | |
896c7fbb | 651 | current_inferior = saved_inferior; |
0d62e5e8 DJ |
652 | } |
653 | } | |
611cb4a5 | 654 | |
0d62e5e8 DJ |
655 | static int |
656 | linux_wait_for_event (struct thread_info *child) | |
657 | { | |
658 | CORE_ADDR stop_pc; | |
659 | struct process_info *event_child; | |
660 | int wstat; | |
b65d95c5 | 661 | int bp_status; |
0d62e5e8 DJ |
662 | |
663 | /* Check for a process with a pending status. */ | |
664 | /* It is possible that the user changed the pending task's registers since | |
665 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 666 | (in check_removed_breakpoint); signals should be reported anyway. */ |
0d62e5e8 DJ |
667 | if (child == NULL) |
668 | { | |
669 | event_child = (struct process_info *) | |
670 | find_inferior (&all_processes, status_pending_p, NULL); | |
671 | if (debug_threads && event_child) | |
a1928bad | 672 | fprintf (stderr, "Got a pending child %ld\n", event_child->lwpid); |
0d62e5e8 DJ |
673 | } |
674 | else | |
675 | { | |
676 | event_child = get_thread_process (child); | |
677 | if (event_child->status_pending_p | |
678 | && check_removed_breakpoint (event_child)) | |
679 | event_child = NULL; | |
680 | } | |
611cb4a5 | 681 | |
0d62e5e8 DJ |
682 | if (event_child != NULL) |
683 | { | |
684 | if (event_child->status_pending_p) | |
611cb4a5 | 685 | { |
0d62e5e8 | 686 | if (debug_threads) |
a1928bad | 687 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", |
0d62e5e8 DJ |
688 | event_child->lwpid, event_child->status_pending); |
689 | wstat = event_child->status_pending; | |
690 | event_child->status_pending_p = 0; | |
691 | event_child->status_pending = 0; | |
692 | current_inferior = get_process_thread (event_child); | |
693 | return wstat; | |
694 | } | |
695 | } | |
696 | ||
697 | /* We only enter this loop if no process has a pending wait status. Thus | |
698 | any action taken in response to a wait status inside this loop is | |
699 | responding as soon as we detect the status, not after any pending | |
700 | events. */ | |
701 | while (1) | |
702 | { | |
703 | if (child == NULL) | |
704 | event_child = NULL; | |
705 | else | |
706 | event_child = get_thread_process (child); | |
707 | ||
708 | linux_wait_for_process (&event_child, &wstat); | |
709 | ||
710 | if (event_child == NULL) | |
711 | error ("event from unknown child"); | |
611cb4a5 | 712 | |
0d62e5e8 | 713 | current_inferior = (struct thread_info *) |
24a09b5f | 714 | find_inferior_id (&all_threads, event_child->lwpid); |
0d62e5e8 | 715 | |
89be2091 | 716 | /* Check for thread exit. */ |
24a09b5f | 717 | if (! WIFSTOPPED (wstat)) |
0d62e5e8 | 718 | { |
89be2091 | 719 | if (debug_threads) |
24a09b5f | 720 | fprintf (stderr, "LWP %ld exiting\n", event_child->head.id); |
89be2091 DJ |
721 | |
722 | /* If the last thread is exiting, just return. */ | |
723 | if (all_threads.head == all_threads.tail) | |
724 | return wstat; | |
725 | ||
24a09b5f | 726 | dead_thread_notify (thread_id_to_gdb_id (event_child->lwpid)); |
89be2091 DJ |
727 | |
728 | remove_inferior (&all_processes, &event_child->head); | |
729 | free (event_child); | |
730 | remove_thread (current_inferior); | |
731 | current_inferior = (struct thread_info *) all_threads.head; | |
732 | ||
733 | /* If we were waiting for this particular child to do something... | |
734 | well, it did something. */ | |
735 | if (child != NULL) | |
736 | return wstat; | |
737 | ||
738 | /* Wait for a more interesting event. */ | |
739 | continue; | |
740 | } | |
741 | ||
24a09b5f | 742 | if (WIFSTOPPED (wstat) |
89be2091 DJ |
743 | && WSTOPSIG (wstat) == SIGSTOP |
744 | && event_child->stop_expected) | |
745 | { | |
746 | if (debug_threads) | |
747 | fprintf (stderr, "Expected stop.\n"); | |
748 | event_child->stop_expected = 0; | |
749 | linux_resume_one_process (&event_child->head, | |
750 | event_child->stepping, 0, NULL); | |
751 | continue; | |
752 | } | |
753 | ||
24a09b5f DJ |
754 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
755 | && wstat >> 16 != 0) | |
756 | { | |
757 | handle_extended_wait (event_child, wstat); | |
758 | continue; | |
759 | } | |
760 | ||
89be2091 DJ |
761 | /* If GDB is not interested in this signal, don't stop other |
762 | threads, and don't report it to GDB. Just resume the | |
763 | inferior right away. We do this for threading-related | |
69f223ed DJ |
764 | signals as well as any that GDB specifically requested we |
765 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
766 | and do not ignore signals when stepping - they may require | |
767 | special handling to skip the signal handler. */ | |
89be2091 DJ |
768 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
769 | thread library? */ | |
770 | if (WIFSTOPPED (wstat) | |
69f223ed | 771 | && !event_child->stepping |
24a09b5f DJ |
772 | && ( |
773 | #ifdef USE_THREAD_DB | |
774 | (thread_db_active && (WSTOPSIG (wstat) == __SIGRTMIN | |
775 | || WSTOPSIG (wstat) == __SIGRTMIN + 1)) | |
776 | || | |
777 | #endif | |
778 | (pass_signals[target_signal_from_host (WSTOPSIG (wstat))] | |
779 | && (WSTOPSIG (wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
780 | { |
781 | siginfo_t info, *info_p; | |
782 | ||
783 | if (debug_threads) | |
24a09b5f DJ |
784 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
785 | WSTOPSIG (wstat), event_child->head.id); | |
89be2091 DJ |
786 | |
787 | if (ptrace (PTRACE_GETSIGINFO, event_child->lwpid, 0, &info) == 0) | |
788 | info_p = &info; | |
789 | else | |
790 | info_p = NULL; | |
791 | linux_resume_one_process (&event_child->head, | |
792 | event_child->stepping, | |
793 | WSTOPSIG (wstat), info_p); | |
794 | continue; | |
0d62e5e8 | 795 | } |
611cb4a5 | 796 | |
0d62e5e8 DJ |
797 | /* If this event was not handled above, and is not a SIGTRAP, report |
798 | it. */ | |
799 | if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGTRAP) | |
800 | return wstat; | |
611cb4a5 | 801 | |
0d62e5e8 DJ |
802 | /* If this target does not support breakpoints, we simply report the |
803 | SIGTRAP; it's of no concern to us. */ | |
804 | if (the_low_target.get_pc == NULL) | |
805 | return wstat; | |
806 | ||
807 | stop_pc = get_stop_pc (); | |
808 | ||
809 | /* bp_reinsert will only be set if we were single-stepping. | |
810 | Notice that we will resume the process after hitting | |
811 | a gdbserver breakpoint; single-stepping to/over one | |
812 | is not supported (yet). */ | |
813 | if (event_child->bp_reinsert != 0) | |
814 | { | |
815 | if (debug_threads) | |
816 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
817 | reinsert_breakpoint (event_child->bp_reinsert); | |
818 | event_child->bp_reinsert = 0; | |
819 | ||
820 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
32ca6d61 | 821 | linux_resume_one_process (&event_child->head, 0, 0, NULL); |
0d62e5e8 DJ |
822 | continue; |
823 | } | |
824 | ||
b65d95c5 | 825 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 826 | |
b65d95c5 | 827 | if (bp_status != 0) |
0d62e5e8 | 828 | { |
b65d95c5 DJ |
829 | if (debug_threads) |
830 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
831 | ||
0d62e5e8 | 832 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 833 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
834 | adjustment for us at the appropriate time. */ |
835 | event_child->pending_is_breakpoint = 1; | |
836 | event_child->pending_stop_pc = stop_pc; | |
837 | ||
b65d95c5 | 838 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
839 | loop instead of simply replacing the breakpoint right away, |
840 | in order to not lose signals sent to the thread that hit the | |
841 | breakpoint. Unfortunately this increases the window where another | |
842 | thread could sneak past the removed breakpoint. For the current | |
843 | use of server-side breakpoints (thread creation) this is | |
844 | acceptable; but it needs to be considered before this breakpoint | |
845 | mechanism can be used in more general ways. For some breakpoints | |
846 | it may be necessary to stop all other threads, but that should | |
847 | be avoided where possible. | |
848 | ||
849 | If breakpoint_reinsert_addr is NULL, that means that we can | |
850 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
851 | mark it for reinsertion, and single-step. | |
852 | ||
853 | Otherwise, call the target function to figure out where we need | |
854 | our temporary breakpoint, create it, and continue executing this | |
855 | process. */ | |
b65d95c5 DJ |
856 | if (bp_status == 2) |
857 | /* No need to reinsert. */ | |
858 | linux_resume_one_process (&event_child->head, 0, 0, NULL); | |
859 | else if (the_low_target.breakpoint_reinsert_addr == NULL) | |
0d62e5e8 DJ |
860 | { |
861 | event_child->bp_reinsert = stop_pc; | |
862 | uninsert_breakpoint (stop_pc); | |
32ca6d61 | 863 | linux_resume_one_process (&event_child->head, 1, 0, NULL); |
0d62e5e8 DJ |
864 | } |
865 | else | |
866 | { | |
867 | reinsert_breakpoint_by_bp | |
868 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
32ca6d61 | 869 | linux_resume_one_process (&event_child->head, 0, 0, NULL); |
611cb4a5 | 870 | } |
0d62e5e8 DJ |
871 | |
872 | continue; | |
873 | } | |
874 | ||
b65d95c5 DJ |
875 | if (debug_threads) |
876 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
877 | ||
0d62e5e8 DJ |
878 | /* If we were single-stepping, we definitely want to report the |
879 | SIGTRAP. The single-step operation has completed, so also | |
aa691b87 | 880 | clear the stepping flag; in general this does not matter, |
0d62e5e8 DJ |
881 | because the SIGTRAP will be reported to the client, which |
882 | will give us a new action for this thread, but clear it for | |
883 | consistency anyway. It's safe to clear the stepping flag | |
884 | because the only consumer of get_stop_pc () after this point | |
e5379b03 | 885 | is check_removed_breakpoint, and pending_is_breakpoint is not |
0d62e5e8 DJ |
886 | set. It might be wiser to use a step_completed flag instead. */ |
887 | if (event_child->stepping) | |
888 | { | |
889 | event_child->stepping = 0; | |
890 | return wstat; | |
891 | } | |
892 | ||
893 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
894 | Check if it is a breakpoint, and if so mark the process information | |
895 | accordingly. This will handle both the necessary fiddling with the | |
896 | PC on decr_pc_after_break targets and suppressing extra threads | |
897 | hitting a breakpoint if two hit it at once and then GDB removes it | |
898 | after the first is reported. Arguably it would be better to report | |
899 | multiple threads hitting breakpoints simultaneously, but the current | |
900 | remote protocol does not allow this. */ | |
901 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
902 | { | |
903 | event_child->pending_is_breakpoint = 1; | |
904 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
905 | } |
906 | ||
907 | return wstat; | |
908 | } | |
0d62e5e8 | 909 | |
611cb4a5 DJ |
910 | /* NOTREACHED */ |
911 | return 0; | |
912 | } | |
913 | ||
0d62e5e8 | 914 | /* Wait for process, returns status. */ |
da6d8c04 | 915 | |
ce3a066d DJ |
916 | static unsigned char |
917 | linux_wait (char *status) | |
da6d8c04 | 918 | { |
e5f1222d | 919 | int w; |
0d62e5e8 DJ |
920 | struct thread_info *child = NULL; |
921 | ||
922 | retry: | |
923 | /* If we were only supposed to resume one thread, only wait for | |
924 | that thread - if it's still alive. If it died, however - which | |
925 | can happen if we're coming from the thread death case below - | |
926 | then we need to make sure we restart the other threads. We could | |
927 | pick a thread at random or restart all; restarting all is less | |
928 | arbitrary. */ | |
d592fa2f | 929 | if (cont_thread != 0 && cont_thread != -1) |
0d62e5e8 DJ |
930 | { |
931 | child = (struct thread_info *) find_inferior_id (&all_threads, | |
932 | cont_thread); | |
933 | ||
934 | /* No stepping, no signal - unless one is pending already, of course. */ | |
935 | if (child == NULL) | |
64386c31 DJ |
936 | { |
937 | struct thread_resume resume_info; | |
938 | resume_info.thread = -1; | |
939 | resume_info.step = resume_info.sig = resume_info.leave_stopped = 0; | |
940 | linux_resume (&resume_info); | |
941 | } | |
0d62e5e8 | 942 | } |
da6d8c04 | 943 | |
0d62e5e8 DJ |
944 | w = linux_wait_for_event (child); |
945 | stop_all_processes (); | |
da6d8c04 | 946 | |
24a09b5f DJ |
947 | if (must_set_ptrace_flags) |
948 | { | |
949 | ptrace (PTRACE_SETOPTIONS, inferior_pid, 0, PTRACE_O_TRACECLONE); | |
950 | must_set_ptrace_flags = 0; | |
951 | } | |
952 | ||
0d62e5e8 DJ |
953 | /* If we are waiting for a particular child, and it exited, |
954 | linux_wait_for_event will return its exit status. Similarly if | |
955 | the last child exited. If this is not the last child, however, | |
956 | do not report it as exited until there is a 'thread exited' response | |
957 | available in the remote protocol. Instead, just wait for another event. | |
958 | This should be safe, because if the thread crashed we will already | |
959 | have reported the termination signal to GDB; that should stop any | |
960 | in-progress stepping operations, etc. | |
961 | ||
962 | Report the exit status of the last thread to exit. This matches | |
963 | LinuxThreads' behavior. */ | |
964 | ||
965 | if (all_threads.head == all_threads.tail) | |
da6d8c04 | 966 | { |
0d62e5e8 DJ |
967 | if (WIFEXITED (w)) |
968 | { | |
969 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
970 | *status = 'W'; | |
971 | clear_inferiors (); | |
075b3282 DJ |
972 | free (all_processes.head); |
973 | all_processes.head = all_processes.tail = NULL; | |
b80864fb | 974 | return WEXITSTATUS (w); |
0d62e5e8 DJ |
975 | } |
976 | else if (!WIFSTOPPED (w)) | |
977 | { | |
978 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
0d62e5e8 | 979 | *status = 'X'; |
075b3282 DJ |
980 | clear_inferiors (); |
981 | free (all_processes.head); | |
982 | all_processes.head = all_processes.tail = NULL; | |
b80864fb | 983 | return target_signal_from_host (WTERMSIG (w)); |
0d62e5e8 | 984 | } |
da6d8c04 | 985 | } |
0d62e5e8 | 986 | else |
da6d8c04 | 987 | { |
0d62e5e8 DJ |
988 | if (!WIFSTOPPED (w)) |
989 | goto retry; | |
da6d8c04 DJ |
990 | } |
991 | ||
da6d8c04 | 992 | *status = 'T'; |
b80864fb | 993 | return target_signal_from_host (WSTOPSIG (w)); |
da6d8c04 DJ |
994 | } |
995 | ||
fd500816 DJ |
996 | /* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if |
997 | thread groups are in use, we need to use tkill. */ | |
998 | ||
999 | static int | |
a1928bad | 1000 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 DJ |
1001 | { |
1002 | static int tkill_failed; | |
1003 | ||
1004 | errno = 0; | |
1005 | ||
1006 | #ifdef SYS_tkill | |
1007 | if (!tkill_failed) | |
1008 | { | |
1009 | int ret = syscall (SYS_tkill, lwpid, signo); | |
1010 | if (errno != ENOSYS) | |
1011 | return ret; | |
1012 | errno = 0; | |
1013 | tkill_failed = 1; | |
1014 | } | |
1015 | #endif | |
1016 | ||
1017 | return kill (lwpid, signo); | |
1018 | } | |
1019 | ||
0d62e5e8 DJ |
1020 | static void |
1021 | send_sigstop (struct inferior_list_entry *entry) | |
1022 | { | |
1023 | struct process_info *process = (struct process_info *) entry; | |
1024 | ||
1025 | if (process->stopped) | |
1026 | return; | |
1027 | ||
1028 | /* If we already have a pending stop signal for this process, don't | |
1029 | send another. */ | |
1030 | if (process->stop_expected) | |
1031 | { | |
ae13219e DJ |
1032 | if (debug_threads) |
1033 | fprintf (stderr, "Have pending sigstop for process %ld\n", | |
1034 | process->lwpid); | |
1035 | ||
1036 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1037 | will receive the SIGSTOP event (instead of silently resuming and | |
1038 | waiting again). It'll be reset below. */ | |
0d62e5e8 DJ |
1039 | process->stop_expected = 0; |
1040 | return; | |
1041 | } | |
1042 | ||
1043 | if (debug_threads) | |
a1928bad | 1044 | fprintf (stderr, "Sending sigstop to process %ld\n", process->head.id); |
0d62e5e8 | 1045 | |
fd500816 | 1046 | kill_lwp (process->head.id, SIGSTOP); |
0d62e5e8 DJ |
1047 | } |
1048 | ||
1049 | static void | |
1050 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1051 | { | |
1052 | struct process_info *process = (struct process_info *) entry; | |
1053 | struct thread_info *saved_inferior, *thread; | |
a1928bad DJ |
1054 | int wstat; |
1055 | unsigned long saved_tid; | |
0d62e5e8 DJ |
1056 | |
1057 | if (process->stopped) | |
1058 | return; | |
1059 | ||
1060 | saved_inferior = current_inferior; | |
1061 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1062 | thread = (struct thread_info *) find_inferior_id (&all_threads, | |
24a09b5f | 1063 | process->lwpid); |
0d62e5e8 DJ |
1064 | wstat = linux_wait_for_event (thread); |
1065 | ||
1066 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1067 | and record the pending SIGSTOP. If the process exited, just | |
1068 | return. */ | |
1069 | if (WIFSTOPPED (wstat) | |
1070 | && WSTOPSIG (wstat) != SIGSTOP) | |
1071 | { | |
1072 | if (debug_threads) | |
24a09b5f DJ |
1073 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
1074 | process->lwpid, wstat); | |
0d62e5e8 DJ |
1075 | process->status_pending_p = 1; |
1076 | process->status_pending = wstat; | |
1077 | process->stop_expected = 1; | |
1078 | } | |
1079 | ||
1080 | if (linux_thread_alive (saved_tid)) | |
1081 | current_inferior = saved_inferior; | |
1082 | else | |
1083 | { | |
1084 | if (debug_threads) | |
1085 | fprintf (stderr, "Previously current thread died.\n"); | |
1086 | ||
1087 | /* Set a valid thread as current. */ | |
1088 | set_desired_inferior (0); | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | static void | |
1093 | stop_all_processes (void) | |
1094 | { | |
1095 | stopping_threads = 1; | |
1096 | for_each_inferior (&all_processes, send_sigstop); | |
1097 | for_each_inferior (&all_processes, wait_for_sigstop); | |
1098 | stopping_threads = 0; | |
1099 | } | |
1100 | ||
da6d8c04 DJ |
1101 | /* Resume execution of the inferior process. |
1102 | If STEP is nonzero, single-step it. | |
1103 | If SIGNAL is nonzero, give it that signal. */ | |
1104 | ||
ce3a066d | 1105 | static void |
0d62e5e8 | 1106 | linux_resume_one_process (struct inferior_list_entry *entry, |
32ca6d61 | 1107 | int step, int signal, siginfo_t *info) |
da6d8c04 | 1108 | { |
0d62e5e8 DJ |
1109 | struct process_info *process = (struct process_info *) entry; |
1110 | struct thread_info *saved_inferior; | |
1111 | ||
1112 | if (process->stopped == 0) | |
1113 | return; | |
1114 | ||
1115 | /* If we have pending signals or status, and a new signal, enqueue the | |
1116 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1117 | breakpoint; it will be picked up again below. */ | |
1118 | if (signal != 0 | |
1119 | && (process->status_pending_p || process->pending_signals != NULL | |
1120 | || process->bp_reinsert != 0)) | |
1121 | { | |
1122 | struct pending_signals *p_sig; | |
bca929d3 | 1123 | p_sig = xmalloc (sizeof (*p_sig)); |
0d62e5e8 DJ |
1124 | p_sig->prev = process->pending_signals; |
1125 | p_sig->signal = signal; | |
32ca6d61 DJ |
1126 | if (info == NULL) |
1127 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1128 | else | |
1129 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
0d62e5e8 DJ |
1130 | process->pending_signals = p_sig; |
1131 | } | |
1132 | ||
e5379b03 | 1133 | if (process->status_pending_p && !check_removed_breakpoint (process)) |
0d62e5e8 DJ |
1134 | return; |
1135 | ||
1136 | saved_inferior = current_inferior; | |
1137 | current_inferior = get_process_thread (process); | |
1138 | ||
1139 | if (debug_threads) | |
a1928bad | 1140 | fprintf (stderr, "Resuming process %ld (%s, signal %d, stop %s)\n", inferior_pid, |
0d62e5e8 DJ |
1141 | step ? "step" : "continue", signal, |
1142 | process->stop_expected ? "expected" : "not expected"); | |
1143 | ||
1144 | /* This bit needs some thinking about. If we get a signal that | |
1145 | we must report while a single-step reinsert is still pending, | |
1146 | we often end up resuming the thread. It might be better to | |
1147 | (ew) allow a stack of pending events; then we could be sure that | |
1148 | the reinsert happened right away and not lose any signals. | |
1149 | ||
1150 | Making this stack would also shrink the window in which breakpoints are | |
1151 | uninserted (see comment in linux_wait_for_process) but not enough for | |
1152 | complete correctness, so it won't solve that problem. It may be | |
1153 | worthwhile just to solve this one, however. */ | |
1154 | if (process->bp_reinsert != 0) | |
1155 | { | |
1156 | if (debug_threads) | |
1157 | fprintf (stderr, " pending reinsert at %08lx", (long)process->bp_reinsert); | |
1158 | if (step == 0) | |
1159 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1160 | step = 1; | |
1161 | ||
1162 | /* Postpone any pending signal. It was enqueued above. */ | |
1163 | signal = 0; | |
1164 | } | |
1165 | ||
1166 | check_removed_breakpoint (process); | |
1167 | ||
aa691b87 | 1168 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 DJ |
1169 | { |
1170 | fprintf (stderr, " "); | |
52fb6437 | 1171 | (*the_low_target.get_pc) (); |
0d62e5e8 DJ |
1172 | } |
1173 | ||
1174 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1175 | a breakpoint. */ | |
1176 | if (process->pending_signals != NULL && process->bp_reinsert == 0) | |
1177 | { | |
1178 | struct pending_signals **p_sig; | |
1179 | ||
1180 | p_sig = &process->pending_signals; | |
1181 | while ((*p_sig)->prev != NULL) | |
1182 | p_sig = &(*p_sig)->prev; | |
1183 | ||
1184 | signal = (*p_sig)->signal; | |
32ca6d61 DJ |
1185 | if ((*p_sig)->info.si_signo != 0) |
1186 | ptrace (PTRACE_SETSIGINFO, process->lwpid, 0, &(*p_sig)->info); | |
1187 | ||
0d62e5e8 DJ |
1188 | free (*p_sig); |
1189 | *p_sig = NULL; | |
1190 | } | |
1191 | ||
1192 | regcache_invalidate_one ((struct inferior_list_entry *) | |
1193 | get_process_thread (process)); | |
da6d8c04 | 1194 | errno = 0; |
0d62e5e8 DJ |
1195 | process->stopped = 0; |
1196 | process->stepping = step; | |
1197 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, process->lwpid, 0, signal); | |
1198 | ||
1199 | current_inferior = saved_inferior; | |
da6d8c04 | 1200 | if (errno) |
3221518c UW |
1201 | { |
1202 | /* ESRCH from ptrace either means that the thread was already | |
1203 | running (an error) or that it is gone (a race condition). If | |
1204 | it's gone, we will get a notification the next time we wait, | |
1205 | so we can ignore the error. We could differentiate these | |
1206 | two, but it's tricky without waiting; the thread still exists | |
1207 | as a zombie, so sending it signal 0 would succeed. So just | |
1208 | ignore ESRCH. */ | |
1209 | if (errno == ESRCH) | |
1210 | return; | |
1211 | ||
1212 | perror_with_name ("ptrace"); | |
1213 | } | |
da6d8c04 DJ |
1214 | } |
1215 | ||
64386c31 DJ |
1216 | static struct thread_resume *resume_ptr; |
1217 | ||
1218 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1219 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1220 | resume request. | |
1221 | ||
1222 | This algorithm is O(threads * resume elements), but resume elements | |
1223 | is small (and will remain small at least until GDB supports thread | |
1224 | suspension). */ | |
0d62e5e8 | 1225 | static void |
5544ad89 | 1226 | linux_set_resume_request (struct inferior_list_entry *entry) |
0d62e5e8 DJ |
1227 | { |
1228 | struct process_info *process; | |
64386c31 | 1229 | struct thread_info *thread; |
5544ad89 | 1230 | int ndx; |
64386c31 DJ |
1231 | |
1232 | thread = (struct thread_info *) entry; | |
1233 | process = get_thread_process (thread); | |
1234 | ||
1235 | ndx = 0; | |
1236 | while (resume_ptr[ndx].thread != -1 && resume_ptr[ndx].thread != entry->id) | |
1237 | ndx++; | |
1238 | ||
5544ad89 DJ |
1239 | process->resume = &resume_ptr[ndx]; |
1240 | } | |
1241 | ||
1242 | /* This function is called once per thread. We check the thread's resume | |
1243 | request, which will tell us whether to resume, step, or leave the thread | |
1244 | stopped; and what signal, if any, it should be sent. For threads which | |
1245 | we aren't explicitly told otherwise, we preserve the stepping flag; this | |
1246 | is used for stepping over gdbserver-placed breakpoints. */ | |
1247 | ||
1248 | static void | |
1249 | linux_continue_one_thread (struct inferior_list_entry *entry) | |
1250 | { | |
1251 | struct process_info *process; | |
1252 | struct thread_info *thread; | |
1253 | int step; | |
1254 | ||
1255 | thread = (struct thread_info *) entry; | |
1256 | process = get_thread_process (thread); | |
1257 | ||
1258 | if (process->resume->leave_stopped) | |
64386c31 DJ |
1259 | return; |
1260 | ||
5544ad89 DJ |
1261 | if (process->resume->thread == -1) |
1262 | step = process->stepping || process->resume->step; | |
64386c31 | 1263 | else |
5544ad89 DJ |
1264 | step = process->resume->step; |
1265 | ||
32ca6d61 | 1266 | linux_resume_one_process (&process->head, step, process->resume->sig, NULL); |
c6ecbae5 | 1267 | |
5544ad89 DJ |
1268 | process->resume = NULL; |
1269 | } | |
1270 | ||
1271 | /* This function is called once per thread. We check the thread's resume | |
1272 | request, which will tell us whether to resume, step, or leave the thread | |
1273 | stopped; and what signal, if any, it should be sent. We queue any needed | |
1274 | signals, since we won't actually resume. We already have a pending event | |
1275 | to report, so we don't need to preserve any step requests; they should | |
1276 | be re-issued if necessary. */ | |
1277 | ||
1278 | static void | |
1279 | linux_queue_one_thread (struct inferior_list_entry *entry) | |
1280 | { | |
1281 | struct process_info *process; | |
1282 | struct thread_info *thread; | |
1283 | ||
1284 | thread = (struct thread_info *) entry; | |
1285 | process = get_thread_process (thread); | |
1286 | ||
1287 | if (process->resume->leave_stopped) | |
1288 | return; | |
1289 | ||
1290 | /* If we have a new signal, enqueue the signal. */ | |
1291 | if (process->resume->sig != 0) | |
1292 | { | |
1293 | struct pending_signals *p_sig; | |
bca929d3 | 1294 | p_sig = xmalloc (sizeof (*p_sig)); |
5544ad89 DJ |
1295 | p_sig->prev = process->pending_signals; |
1296 | p_sig->signal = process->resume->sig; | |
32ca6d61 DJ |
1297 | memset (&p_sig->info, 0, sizeof (siginfo_t)); |
1298 | ||
1299 | /* If this is the same signal we were previously stopped by, | |
1300 | make sure to queue its siginfo. We can ignore the return | |
1301 | value of ptrace; if it fails, we'll skip | |
1302 | PTRACE_SETSIGINFO. */ | |
1303 | if (WIFSTOPPED (process->last_status) | |
1304 | && WSTOPSIG (process->last_status) == process->resume->sig) | |
1305 | ptrace (PTRACE_GETSIGINFO, process->lwpid, 0, &p_sig->info); | |
1306 | ||
5544ad89 DJ |
1307 | process->pending_signals = p_sig; |
1308 | } | |
1309 | ||
1310 | process->resume = NULL; | |
1311 | } | |
1312 | ||
1313 | /* Set DUMMY if this process has an interesting status pending. */ | |
1314 | static int | |
1315 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
1316 | { | |
1317 | struct process_info *process = (struct process_info *) entry; | |
1318 | ||
1319 | /* Processes which will not be resumed are not interesting, because | |
1320 | we might not wait for them next time through linux_wait. */ | |
1321 | if (process->resume->leave_stopped) | |
1322 | return 0; | |
1323 | ||
1324 | /* If this thread has a removed breakpoint, we won't have any | |
1325 | events to report later, so check now. check_removed_breakpoint | |
1326 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1327 | for any thread that we are not otherwise going to resume - this | |
1328 | lets us preserve stopped status when two threads hit a breakpoint. | |
1329 | GDB removes the breakpoint to single-step a particular thread | |
1330 | past it, then re-inserts it and resumes all threads. We want | |
1331 | to report the second thread without resuming it in the interim. */ | |
1332 | if (process->status_pending_p) | |
1333 | check_removed_breakpoint (process); | |
1334 | ||
1335 | if (process->status_pending_p) | |
1336 | * (int *) flag_p = 1; | |
1337 | ||
1338 | return 0; | |
0d62e5e8 DJ |
1339 | } |
1340 | ||
1341 | static void | |
64386c31 | 1342 | linux_resume (struct thread_resume *resume_info) |
0d62e5e8 | 1343 | { |
5544ad89 | 1344 | int pending_flag; |
c6ecbae5 | 1345 | |
5544ad89 | 1346 | /* Yes, the use of a global here is rather ugly. */ |
64386c31 | 1347 | resume_ptr = resume_info; |
5544ad89 DJ |
1348 | |
1349 | for_each_inferior (&all_threads, linux_set_resume_request); | |
1350 | ||
1351 | /* If there is a thread which would otherwise be resumed, which | |
1352 | has a pending status, then don't resume any threads - we can just | |
1353 | report the pending status. Make sure to queue any signals | |
1354 | that would otherwise be sent. */ | |
1355 | pending_flag = 0; | |
1356 | find_inferior (&all_processes, resume_status_pending_p, &pending_flag); | |
1357 | ||
1358 | if (debug_threads) | |
1359 | { | |
1360 | if (pending_flag) | |
1361 | fprintf (stderr, "Not resuming, pending status\n"); | |
1362 | else | |
1363 | fprintf (stderr, "Resuming, no pending status\n"); | |
1364 | } | |
1365 | ||
1366 | if (pending_flag) | |
1367 | for_each_inferior (&all_threads, linux_queue_one_thread); | |
1368 | else | |
a20d5e98 | 1369 | for_each_inferior (&all_threads, linux_continue_one_thread); |
0d62e5e8 DJ |
1370 | } |
1371 | ||
1372 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
1373 | |
1374 | int | |
0a30fbc4 | 1375 | register_addr (int regnum) |
da6d8c04 DJ |
1376 | { |
1377 | int addr; | |
1378 | ||
2ec06d2e | 1379 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
1380 | error ("Invalid register number %d.", regnum); |
1381 | ||
2ec06d2e | 1382 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
1383 | |
1384 | return addr; | |
1385 | } | |
1386 | ||
58caa3dc | 1387 | /* Fetch one register. */ |
da6d8c04 DJ |
1388 | static void |
1389 | fetch_register (int regno) | |
1390 | { | |
1391 | CORE_ADDR regaddr; | |
48d93c75 | 1392 | int i, size; |
0d62e5e8 | 1393 | char *buf; |
da6d8c04 | 1394 | |
2ec06d2e | 1395 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 1396 | return; |
2ec06d2e | 1397 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 1398 | return; |
da6d8c04 | 1399 | |
0a30fbc4 DJ |
1400 | regaddr = register_addr (regno); |
1401 | if (regaddr == -1) | |
1402 | return; | |
48d93c75 UW |
1403 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
1404 | & - sizeof (PTRACE_XFER_TYPE); | |
1405 | buf = alloca (size); | |
1406 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
1407 | { |
1408 | errno = 0; | |
0d62e5e8 | 1409 | *(PTRACE_XFER_TYPE *) (buf + i) = |
da6d8c04 DJ |
1410 | ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
1411 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
1412 | if (errno != 0) | |
1413 | { | |
1414 | /* Warning, not error, in case we are attached; sometimes the | |
1415 | kernel doesn't let us at the registers. */ | |
1416 | char *err = strerror (errno); | |
1417 | char *msg = alloca (strlen (err) + 128); | |
1418 | sprintf (msg, "reading register %d: %s", regno, err); | |
1419 | error (msg); | |
1420 | goto error_exit; | |
1421 | } | |
1422 | } | |
ee1a7ae4 UW |
1423 | |
1424 | if (the_low_target.supply_ptrace_register) | |
1425 | the_low_target.supply_ptrace_register (regno, buf); | |
5a1f5858 DJ |
1426 | else |
1427 | supply_register (regno, buf); | |
0d62e5e8 | 1428 | |
da6d8c04 DJ |
1429 | error_exit:; |
1430 | } | |
1431 | ||
1432 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
1433 | static void |
1434 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 DJ |
1435 | { |
1436 | if (regno == -1 || regno == 0) | |
2ec06d2e | 1437 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
1438 | fetch_register (regno); |
1439 | else | |
1440 | fetch_register (regno); | |
1441 | } | |
1442 | ||
1443 | /* Store our register values back into the inferior. | |
1444 | If REGNO is -1, do this for all registers. | |
1445 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
1446 | static void |
1447 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
1448 | { |
1449 | CORE_ADDR regaddr; | |
48d93c75 | 1450 | int i, size; |
0d62e5e8 | 1451 | char *buf; |
da6d8c04 DJ |
1452 | |
1453 | if (regno >= 0) | |
1454 | { | |
2ec06d2e | 1455 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
1456 | return; |
1457 | ||
bc1e36ca | 1458 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
1459 | return; |
1460 | ||
1461 | regaddr = register_addr (regno); | |
1462 | if (regaddr == -1) | |
da6d8c04 | 1463 | return; |
da6d8c04 | 1464 | errno = 0; |
48d93c75 UW |
1465 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
1466 | & - sizeof (PTRACE_XFER_TYPE); | |
1467 | buf = alloca (size); | |
1468 | memset (buf, 0, size); | |
ee1a7ae4 UW |
1469 | |
1470 | if (the_low_target.collect_ptrace_register) | |
1471 | the_low_target.collect_ptrace_register (regno, buf); | |
5a1f5858 DJ |
1472 | else |
1473 | collect_register (regno, buf); | |
ee1a7ae4 | 1474 | |
48d93c75 | 1475 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 1476 | { |
0a30fbc4 DJ |
1477 | errno = 0; |
1478 | ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
2ff29de4 | 1479 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
1480 | if (errno != 0) |
1481 | { | |
3221518c UW |
1482 | /* At this point, ESRCH should mean the process is already gone, |
1483 | in which case we simply ignore attempts to change its registers. | |
1484 | See also the related comment in linux_resume_one_process. */ | |
1485 | if (errno == ESRCH) | |
1486 | return; | |
1487 | ||
bc1e36ca DJ |
1488 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
1489 | { | |
1490 | char *err = strerror (errno); | |
1491 | char *msg = alloca (strlen (err) + 128); | |
1492 | sprintf (msg, "writing register %d: %s", | |
1493 | regno, err); | |
1494 | error (msg); | |
1495 | return; | |
1496 | } | |
da6d8c04 | 1497 | } |
2ff29de4 | 1498 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 1499 | } |
da6d8c04 DJ |
1500 | } |
1501 | else | |
2ec06d2e | 1502 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 1503 | usr_store_inferior_registers (regno); |
da6d8c04 | 1504 | } |
58caa3dc DJ |
1505 | #endif /* HAVE_LINUX_USRREGS */ |
1506 | ||
1507 | ||
1508 | ||
1509 | #ifdef HAVE_LINUX_REGSETS | |
1510 | ||
1511 | static int | |
0d62e5e8 | 1512 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
1513 | { |
1514 | struct regset_info *regset; | |
e9d25b98 | 1515 | int saw_general_regs = 0; |
58caa3dc DJ |
1516 | |
1517 | regset = target_regsets; | |
1518 | ||
1519 | while (regset->size >= 0) | |
1520 | { | |
1521 | void *buf; | |
1522 | int res; | |
1523 | ||
52fa2412 | 1524 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
1525 | { |
1526 | regset ++; | |
1527 | continue; | |
1528 | } | |
1529 | ||
bca929d3 | 1530 | buf = xmalloc (regset->size); |
dfb64f85 | 1531 | #ifndef __sparc__ |
d06f167a | 1532 | res = ptrace (regset->get_request, inferior_pid, 0, buf); |
dfb64f85 DJ |
1533 | #else |
1534 | res = ptrace (regset->get_request, inferior_pid, buf, 0); | |
1535 | #endif | |
58caa3dc DJ |
1536 | if (res < 0) |
1537 | { | |
1538 | if (errno == EIO) | |
1539 | { | |
52fa2412 UW |
1540 | /* If we get EIO on a regset, do not try it again for |
1541 | this process. */ | |
1542 | disabled_regsets[regset - target_regsets] = 1; | |
1543 | continue; | |
58caa3dc DJ |
1544 | } |
1545 | else | |
1546 | { | |
0d62e5e8 | 1547 | char s[256]; |
a1928bad | 1548 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%ld", |
0d62e5e8 DJ |
1549 | inferior_pid); |
1550 | perror (s); | |
58caa3dc DJ |
1551 | } |
1552 | } | |
e9d25b98 DJ |
1553 | else if (regset->type == GENERAL_REGS) |
1554 | saw_general_regs = 1; | |
58caa3dc DJ |
1555 | regset->store_function (buf); |
1556 | regset ++; | |
1557 | } | |
e9d25b98 DJ |
1558 | if (saw_general_regs) |
1559 | return 0; | |
1560 | else | |
1561 | return 1; | |
58caa3dc DJ |
1562 | } |
1563 | ||
1564 | static int | |
0d62e5e8 | 1565 | regsets_store_inferior_registers () |
58caa3dc DJ |
1566 | { |
1567 | struct regset_info *regset; | |
e9d25b98 | 1568 | int saw_general_regs = 0; |
58caa3dc DJ |
1569 | |
1570 | regset = target_regsets; | |
1571 | ||
1572 | while (regset->size >= 0) | |
1573 | { | |
1574 | void *buf; | |
1575 | int res; | |
1576 | ||
52fa2412 | 1577 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
1578 | { |
1579 | regset ++; | |
1580 | continue; | |
1581 | } | |
1582 | ||
bca929d3 | 1583 | buf = xmalloc (regset->size); |
545587ee DJ |
1584 | |
1585 | /* First fill the buffer with the current register set contents, | |
1586 | in case there are any items in the kernel's regset that are | |
1587 | not in gdbserver's regcache. */ | |
dfb64f85 | 1588 | #ifndef __sparc__ |
545587ee | 1589 | res = ptrace (regset->get_request, inferior_pid, 0, buf); |
dfb64f85 DJ |
1590 | #else |
1591 | res = ptrace (regset->get_request, inferior_pid, buf, 0); | |
1592 | #endif | |
545587ee DJ |
1593 | |
1594 | if (res == 0) | |
1595 | { | |
1596 | /* Then overlay our cached registers on that. */ | |
1597 | regset->fill_function (buf); | |
1598 | ||
1599 | /* Only now do we write the register set. */ | |
dfb64f85 DJ |
1600 | #ifndef __sparc__ |
1601 | res = ptrace (regset->set_request, inferior_pid, 0, buf); | |
1602 | #else | |
1603 | res = ptrace (regset->set_request, inferior_pid, buf, 0); | |
1604 | #endif | |
545587ee DJ |
1605 | } |
1606 | ||
58caa3dc DJ |
1607 | if (res < 0) |
1608 | { | |
1609 | if (errno == EIO) | |
1610 | { | |
52fa2412 UW |
1611 | /* If we get EIO on a regset, do not try it again for |
1612 | this process. */ | |
1613 | disabled_regsets[regset - target_regsets] = 1; | |
1614 | continue; | |
58caa3dc | 1615 | } |
3221518c UW |
1616 | else if (errno == ESRCH) |
1617 | { | |
1618 | /* At this point, ESRCH should mean the process is already gone, | |
1619 | in which case we simply ignore attempts to change its registers. | |
1620 | See also the related comment in linux_resume_one_process. */ | |
1621 | return 0; | |
1622 | } | |
58caa3dc DJ |
1623 | else |
1624 | { | |
ce3a066d | 1625 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
1626 | } |
1627 | } | |
e9d25b98 DJ |
1628 | else if (regset->type == GENERAL_REGS) |
1629 | saw_general_regs = 1; | |
58caa3dc | 1630 | regset ++; |
09ec9b38 | 1631 | free (buf); |
58caa3dc | 1632 | } |
e9d25b98 DJ |
1633 | if (saw_general_regs) |
1634 | return 0; | |
1635 | else | |
1636 | return 1; | |
ce3a066d | 1637 | return 0; |
58caa3dc DJ |
1638 | } |
1639 | ||
1640 | #endif /* HAVE_LINUX_REGSETS */ | |
1641 | ||
1642 | ||
1643 | void | |
ce3a066d | 1644 | linux_fetch_registers (int regno) |
58caa3dc DJ |
1645 | { |
1646 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
1647 | if (regsets_fetch_inferior_registers () == 0) |
1648 | return; | |
58caa3dc DJ |
1649 | #endif |
1650 | #ifdef HAVE_LINUX_USRREGS | |
1651 | usr_fetch_inferior_registers (regno); | |
1652 | #endif | |
1653 | } | |
1654 | ||
1655 | void | |
ce3a066d | 1656 | linux_store_registers (int regno) |
58caa3dc DJ |
1657 | { |
1658 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
1659 | if (regsets_store_inferior_registers () == 0) |
1660 | return; | |
58caa3dc DJ |
1661 | #endif |
1662 | #ifdef HAVE_LINUX_USRREGS | |
1663 | usr_store_inferior_registers (regno); | |
1664 | #endif | |
1665 | } | |
1666 | ||
da6d8c04 | 1667 | |
da6d8c04 DJ |
1668 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
1669 | to debugger memory starting at MYADDR. */ | |
1670 | ||
c3e735a6 | 1671 | static int |
f450004a | 1672 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
1673 | { |
1674 | register int i; | |
1675 | /* Round starting address down to longword boundary. */ | |
1676 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
1677 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
1678 | register int count |
1679 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
1680 | / sizeof (PTRACE_XFER_TYPE); |
1681 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 1682 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 1683 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
1684 | int fd; |
1685 | char filename[64]; | |
1686 | ||
1687 | /* Try using /proc. Don't bother for one word. */ | |
1688 | if (len >= 3 * sizeof (long)) | |
1689 | { | |
1690 | /* We could keep this file open and cache it - possibly one per | |
1691 | thread. That requires some juggling, but is even faster. */ | |
1692 | sprintf (filename, "/proc/%ld/mem", inferior_pid); | |
1693 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
1694 | if (fd == -1) | |
1695 | goto no_proc; | |
1696 | ||
1697 | /* If pread64 is available, use it. It's faster if the kernel | |
1698 | supports it (only one syscall), and it's 64-bit safe even on | |
1699 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
1700 | application). */ | |
1701 | #ifdef HAVE_PREAD64 | |
1702 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
1703 | #else | |
1704 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len) | |
1705 | #endif | |
1706 | { | |
1707 | close (fd); | |
1708 | goto no_proc; | |
1709 | } | |
1710 | ||
1711 | close (fd); | |
1712 | return 0; | |
1713 | } | |
da6d8c04 | 1714 | |
fd462a61 | 1715 | no_proc: |
da6d8c04 DJ |
1716 | /* Read all the longwords */ |
1717 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
1718 | { | |
c3e735a6 | 1719 | errno = 0; |
d844cde6 | 1720 | buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0); |
c3e735a6 DJ |
1721 | if (errno) |
1722 | return errno; | |
da6d8c04 DJ |
1723 | } |
1724 | ||
1725 | /* Copy appropriate bytes out of the buffer. */ | |
1726 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), len); | |
c3e735a6 DJ |
1727 | |
1728 | return 0; | |
da6d8c04 DJ |
1729 | } |
1730 | ||
1731 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
1732 | to inferior's memory at MEMADDR. | |
1733 | On failure (cannot write the inferior) | |
1734 | returns the value of errno. */ | |
1735 | ||
ce3a066d | 1736 | static int |
f450004a | 1737 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
1738 | { |
1739 | register int i; | |
1740 | /* Round starting address down to longword boundary. */ | |
1741 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
1742 | /* Round ending address up; get number of longwords that makes. */ | |
1743 | register int count | |
1744 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
1745 | /* Allocate buffer of that many longwords. */ | |
1746 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
da6d8c04 | 1747 | |
0d62e5e8 DJ |
1748 | if (debug_threads) |
1749 | { | |
1750 | fprintf (stderr, "Writing %02x to %08lx\n", (unsigned)myaddr[0], (long)memaddr); | |
1751 | } | |
1752 | ||
da6d8c04 DJ |
1753 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
1754 | ||
d844cde6 DJ |
1755 | buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid, |
1756 | (PTRACE_ARG3_TYPE) addr, 0); | |
da6d8c04 DJ |
1757 | |
1758 | if (count > 1) | |
1759 | { | |
1760 | buffer[count - 1] | |
1761 | = ptrace (PTRACE_PEEKTEXT, inferior_pid, | |
d844cde6 DJ |
1762 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
1763 | * sizeof (PTRACE_XFER_TYPE)), | |
1764 | 0); | |
da6d8c04 DJ |
1765 | } |
1766 | ||
1767 | /* Copy data to be written over corresponding part of buffer */ | |
1768 | ||
1769 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
1770 | ||
1771 | /* Write the entire buffer. */ | |
1772 | ||
1773 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
1774 | { | |
1775 | errno = 0; | |
d844cde6 | 1776 | ptrace (PTRACE_POKETEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
1777 | if (errno) |
1778 | return errno; | |
1779 | } | |
1780 | ||
1781 | return 0; | |
1782 | } | |
2f2893d9 | 1783 | |
24a09b5f DJ |
1784 | static int linux_supports_tracefork_flag; |
1785 | ||
51c2684e | 1786 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 1787 | |
51c2684e DJ |
1788 | static int |
1789 | linux_tracefork_grandchild (void *arg) | |
1790 | { | |
1791 | _exit (0); | |
1792 | } | |
1793 | ||
7407e2de AS |
1794 | #define STACK_SIZE 4096 |
1795 | ||
51c2684e DJ |
1796 | static int |
1797 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
1798 | { |
1799 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
1800 | kill (getpid (), SIGSTOP); | |
7407e2de AS |
1801 | #ifdef __ia64__ |
1802 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
1803 | CLONE_VM | SIGCHLD, NULL); | |
1804 | #else | |
1805 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
1806 | CLONE_VM | SIGCHLD, NULL); | |
1807 | #endif | |
24a09b5f DJ |
1808 | _exit (0); |
1809 | } | |
1810 | ||
1811 | /* Wrapper function for waitpid which handles EINTR. */ | |
1812 | ||
1813 | static int | |
1814 | my_waitpid (int pid, int *status, int flags) | |
1815 | { | |
1816 | int ret; | |
1817 | do | |
1818 | { | |
1819 | ret = waitpid (pid, status, flags); | |
1820 | } | |
1821 | while (ret == -1 && errno == EINTR); | |
1822 | ||
1823 | return ret; | |
1824 | } | |
1825 | ||
1826 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make | |
1827 | sure that we can enable the option, and that it had the desired | |
1828 | effect. */ | |
1829 | ||
1830 | static void | |
1831 | linux_test_for_tracefork (void) | |
1832 | { | |
1833 | int child_pid, ret, status; | |
1834 | long second_pid; | |
bca929d3 | 1835 | char *stack = xmalloc (STACK_SIZE * 4); |
24a09b5f DJ |
1836 | |
1837 | linux_supports_tracefork_flag = 0; | |
1838 | ||
51c2684e | 1839 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
1840 | #ifdef __ia64__ |
1841 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
1842 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
1843 | #else | |
1844 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, | |
1845 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
1846 | #endif | |
24a09b5f | 1847 | if (child_pid == -1) |
51c2684e | 1848 | perror_with_name ("clone"); |
24a09b5f DJ |
1849 | |
1850 | ret = my_waitpid (child_pid, &status, 0); | |
1851 | if (ret == -1) | |
1852 | perror_with_name ("waitpid"); | |
1853 | else if (ret != child_pid) | |
1854 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
1855 | if (! WIFSTOPPED (status)) | |
1856 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
1857 | ||
1858 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); | |
1859 | if (ret != 0) | |
1860 | { | |
1861 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
1862 | if (ret != 0) | |
1863 | { | |
1864 | warning ("linux_test_for_tracefork: failed to kill child"); | |
1865 | return; | |
1866 | } | |
1867 | ||
1868 | ret = my_waitpid (child_pid, &status, 0); | |
1869 | if (ret != child_pid) | |
1870 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
1871 | else if (!WIFSIGNALED (status)) | |
1872 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
1873 | "killed child", status); | |
1874 | ||
1875 | return; | |
1876 | } | |
1877 | ||
1878 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
1879 | if (ret != 0) | |
1880 | warning ("linux_test_for_tracefork: failed to resume child"); | |
1881 | ||
1882 | ret = my_waitpid (child_pid, &status, 0); | |
1883 | ||
1884 | if (ret == child_pid && WIFSTOPPED (status) | |
1885 | && status >> 16 == PTRACE_EVENT_FORK) | |
1886 | { | |
1887 | second_pid = 0; | |
1888 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
1889 | if (ret == 0 && second_pid != 0) | |
1890 | { | |
1891 | int second_status; | |
1892 | ||
1893 | linux_supports_tracefork_flag = 1; | |
1894 | my_waitpid (second_pid, &second_status, 0); | |
1895 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
1896 | if (ret != 0) | |
1897 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
1898 | my_waitpid (second_pid, &status, 0); | |
1899 | } | |
1900 | } | |
1901 | else | |
1902 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
1903 | "(%d, status 0x%x)", ret, status); | |
1904 | ||
1905 | do | |
1906 | { | |
1907 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
1908 | if (ret != 0) | |
1909 | warning ("linux_test_for_tracefork: failed to kill child"); | |
1910 | my_waitpid (child_pid, &status, 0); | |
1911 | } | |
1912 | while (WIFSTOPPED (status)); | |
51c2684e DJ |
1913 | |
1914 | free (stack); | |
24a09b5f DJ |
1915 | } |
1916 | ||
1917 | ||
2f2893d9 DJ |
1918 | static void |
1919 | linux_look_up_symbols (void) | |
1920 | { | |
0d62e5e8 | 1921 | #ifdef USE_THREAD_DB |
24a09b5f | 1922 | if (thread_db_active) |
0d62e5e8 DJ |
1923 | return; |
1924 | ||
24a09b5f | 1925 | thread_db_active = thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
1926 | #endif |
1927 | } | |
1928 | ||
e5379b03 | 1929 | static void |
ef57601b | 1930 | linux_request_interrupt (void) |
e5379b03 | 1931 | { |
a1928bad | 1932 | extern unsigned long signal_pid; |
e5379b03 | 1933 | |
d592fa2f | 1934 | if (cont_thread != 0 && cont_thread != -1) |
e5379b03 DJ |
1935 | { |
1936 | struct process_info *process; | |
1937 | ||
1938 | process = get_thread_process (current_inferior); | |
ef57601b | 1939 | kill_lwp (process->lwpid, SIGINT); |
e5379b03 DJ |
1940 | } |
1941 | else | |
ef57601b | 1942 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
1943 | } |
1944 | ||
aa691b87 RM |
1945 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
1946 | to debugger memory starting at MYADDR. */ | |
1947 | ||
1948 | static int | |
f450004a | 1949 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
1950 | { |
1951 | char filename[PATH_MAX]; | |
1952 | int fd, n; | |
1953 | ||
a1928bad | 1954 | snprintf (filename, sizeof filename, "/proc/%ld/auxv", inferior_pid); |
aa691b87 RM |
1955 | |
1956 | fd = open (filename, O_RDONLY); | |
1957 | if (fd < 0) | |
1958 | return -1; | |
1959 | ||
1960 | if (offset != (CORE_ADDR) 0 | |
1961 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
1962 | n = -1; | |
1963 | else | |
1964 | n = read (fd, myaddr, len); | |
1965 | ||
1966 | close (fd); | |
1967 | ||
1968 | return n; | |
1969 | } | |
1970 | ||
e013ee27 OF |
1971 | /* These watchpoint related wrapper functions simply pass on the function call |
1972 | if the target has registered a corresponding function. */ | |
1973 | ||
1974 | static int | |
1975 | linux_insert_watchpoint (char type, CORE_ADDR addr, int len) | |
1976 | { | |
1977 | if (the_low_target.insert_watchpoint != NULL) | |
1978 | return the_low_target.insert_watchpoint (type, addr, len); | |
1979 | else | |
1980 | /* Unsupported (see target.h). */ | |
1981 | return 1; | |
1982 | } | |
1983 | ||
1984 | static int | |
1985 | linux_remove_watchpoint (char type, CORE_ADDR addr, int len) | |
1986 | { | |
1987 | if (the_low_target.remove_watchpoint != NULL) | |
1988 | return the_low_target.remove_watchpoint (type, addr, len); | |
1989 | else | |
1990 | /* Unsupported (see target.h). */ | |
1991 | return 1; | |
1992 | } | |
1993 | ||
1994 | static int | |
1995 | linux_stopped_by_watchpoint (void) | |
1996 | { | |
1997 | if (the_low_target.stopped_by_watchpoint != NULL) | |
1998 | return the_low_target.stopped_by_watchpoint (); | |
1999 | else | |
2000 | return 0; | |
2001 | } | |
2002 | ||
2003 | static CORE_ADDR | |
2004 | linux_stopped_data_address (void) | |
2005 | { | |
2006 | if (the_low_target.stopped_data_address != NULL) | |
2007 | return the_low_target.stopped_data_address (); | |
2008 | else | |
2009 | return 0; | |
2010 | } | |
2011 | ||
42c81e2a | 2012 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
2013 | #if defined(__mcoldfire__) |
2014 | /* These should really be defined in the kernel's ptrace.h header. */ | |
2015 | #define PT_TEXT_ADDR 49*4 | |
2016 | #define PT_DATA_ADDR 50*4 | |
2017 | #define PT_TEXT_END_ADDR 51*4 | |
2018 | #endif | |
2019 | ||
2020 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
2021 | to tell gdb about. */ | |
2022 | ||
2023 | static int | |
2024 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
2025 | { | |
2026 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
2027 | unsigned long text, text_end, data; | |
2028 | int pid = get_thread_process (current_inferior)->head.id; | |
2029 | ||
2030 | errno = 0; | |
2031 | ||
2032 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
2033 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
2034 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
2035 | ||
2036 | if (errno == 0) | |
2037 | { | |
2038 | /* Both text and data offsets produced at compile-time (and so | |
2039 | used by gdb) are relative to the beginning of the program, | |
2040 | with the data segment immediately following the text segment. | |
2041 | However, the actual runtime layout in memory may put the data | |
2042 | somewhere else, so when we send gdb a data base-address, we | |
2043 | use the real data base address and subtract the compile-time | |
2044 | data base-address from it (which is just the length of the | |
2045 | text segment). BSS immediately follows data in both | |
2046 | cases. */ | |
2047 | *text_p = text; | |
2048 | *data_p = data - (text_end - text); | |
2049 | ||
2050 | return 1; | |
2051 | } | |
2052 | #endif | |
2053 | return 0; | |
2054 | } | |
2055 | #endif | |
2056 | ||
07e059b5 VP |
2057 | static int |
2058 | linux_qxfer_osdata (const char *annex, | |
2059 | unsigned char *readbuf, unsigned const char *writebuf, | |
2060 | CORE_ADDR offset, int len) | |
2061 | { | |
2062 | /* We make the process list snapshot when the object starts to be | |
2063 | read. */ | |
2064 | static const char *buf; | |
2065 | static long len_avail = -1; | |
2066 | static struct buffer buffer; | |
2067 | ||
2068 | DIR *dirp; | |
2069 | ||
2070 | if (strcmp (annex, "processes") != 0) | |
2071 | return 0; | |
2072 | ||
2073 | if (!readbuf || writebuf) | |
2074 | return 0; | |
2075 | ||
2076 | if (offset == 0) | |
2077 | { | |
2078 | if (len_avail != -1 && len_avail != 0) | |
2079 | buffer_free (&buffer); | |
2080 | len_avail = 0; | |
2081 | buf = NULL; | |
2082 | buffer_init (&buffer); | |
2083 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
2084 | ||
2085 | dirp = opendir ("/proc"); | |
2086 | if (dirp) | |
2087 | { | |
2088 | struct dirent *dp; | |
2089 | while ((dp = readdir (dirp)) != NULL) | |
2090 | { | |
2091 | struct stat statbuf; | |
2092 | char procentry[sizeof ("/proc/4294967295")]; | |
2093 | ||
2094 | if (!isdigit (dp->d_name[0]) | |
2095 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
2096 | continue; | |
2097 | ||
2098 | sprintf (procentry, "/proc/%s", dp->d_name); | |
2099 | if (stat (procentry, &statbuf) == 0 | |
2100 | && S_ISDIR (statbuf.st_mode)) | |
2101 | { | |
2102 | char pathname[128]; | |
2103 | FILE *f; | |
2104 | char cmd[MAXPATHLEN + 1]; | |
2105 | struct passwd *entry; | |
2106 | ||
2107 | sprintf (pathname, "/proc/%s/cmdline", dp->d_name); | |
2108 | entry = getpwuid (statbuf.st_uid); | |
2109 | ||
2110 | if ((f = fopen (pathname, "r")) != NULL) | |
2111 | { | |
2112 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
2113 | if (len > 0) | |
2114 | { | |
2115 | int i; | |
2116 | for (i = 0; i < len; i++) | |
2117 | if (cmd[i] == '\0') | |
2118 | cmd[i] = ' '; | |
2119 | cmd[len] = '\0'; | |
2120 | ||
2121 | buffer_xml_printf ( | |
2122 | &buffer, | |
2123 | "<item>" | |
2124 | "<column name=\"pid\">%s</column>" | |
2125 | "<column name=\"user\">%s</column>" | |
2126 | "<column name=\"command\">%s</column>" | |
2127 | "</item>", | |
2128 | dp->d_name, | |
2129 | entry ? entry->pw_name : "?", | |
2130 | cmd); | |
2131 | } | |
2132 | fclose (f); | |
2133 | } | |
2134 | } | |
2135 | } | |
2136 | ||
2137 | closedir (dirp); | |
2138 | } | |
2139 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
2140 | buf = buffer_finish (&buffer); | |
2141 | len_avail = strlen (buf); | |
2142 | } | |
2143 | ||
2144 | if (offset >= len_avail) | |
2145 | { | |
2146 | /* Done. Get rid of the data. */ | |
2147 | buffer_free (&buffer); | |
2148 | buf = NULL; | |
2149 | len_avail = 0; | |
2150 | return 0; | |
2151 | } | |
2152 | ||
2153 | if (len > len_avail - offset) | |
2154 | len = len_avail - offset; | |
2155 | memcpy (readbuf, buf + offset, len); | |
2156 | ||
2157 | return len; | |
2158 | } | |
2159 | ||
ce3a066d DJ |
2160 | static struct target_ops linux_target_ops = { |
2161 | linux_create_inferior, | |
2162 | linux_attach, | |
2163 | linux_kill, | |
6ad8ae5c | 2164 | linux_detach, |
444d6139 | 2165 | linux_join, |
ce3a066d DJ |
2166 | linux_thread_alive, |
2167 | linux_resume, | |
2168 | linux_wait, | |
2169 | linux_fetch_registers, | |
2170 | linux_store_registers, | |
2171 | linux_read_memory, | |
2172 | linux_write_memory, | |
2f2893d9 | 2173 | linux_look_up_symbols, |
ef57601b | 2174 | linux_request_interrupt, |
aa691b87 | 2175 | linux_read_auxv, |
e013ee27 OF |
2176 | linux_insert_watchpoint, |
2177 | linux_remove_watchpoint, | |
2178 | linux_stopped_by_watchpoint, | |
2179 | linux_stopped_data_address, | |
42c81e2a | 2180 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 2181 | linux_read_offsets, |
dae5f5cf DJ |
2182 | #else |
2183 | NULL, | |
2184 | #endif | |
2185 | #ifdef USE_THREAD_DB | |
2186 | thread_db_get_tls_address, | |
2187 | #else | |
2188 | NULL, | |
52fb6437 | 2189 | #endif |
59a016f0 PA |
2190 | NULL, |
2191 | hostio_last_error_from_errno, | |
07e059b5 | 2192 | linux_qxfer_osdata, |
ce3a066d DJ |
2193 | }; |
2194 | ||
0d62e5e8 DJ |
2195 | static void |
2196 | linux_init_signals () | |
2197 | { | |
2198 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
2199 | to find what the cancel signal actually is. */ | |
254787d4 | 2200 | signal (__SIGRTMIN+1, SIG_IGN); |
0d62e5e8 DJ |
2201 | } |
2202 | ||
da6d8c04 DJ |
2203 | void |
2204 | initialize_low (void) | |
2205 | { | |
24a09b5f | 2206 | thread_db_active = 0; |
ce3a066d | 2207 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
2208 | set_breakpoint_data (the_low_target.breakpoint, |
2209 | the_low_target.breakpoint_len); | |
0d62e5e8 | 2210 | linux_init_signals (); |
24a09b5f | 2211 | linux_test_for_tracefork (); |
52fa2412 UW |
2212 | #ifdef HAVE_LINUX_REGSETS |
2213 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
2214 | ; | |
bca929d3 | 2215 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 2216 | #endif |
da6d8c04 | 2217 | } |