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, |
0fb0cc75 | 3 | 2006, 2007, 2008, 2009 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 | |
54a0b537 | 92 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
0d62e5e8 DJ |
93 | the same as the LWP ID. */ |
94 | ||
54a0b537 | 95 | struct inferior_list all_lwps; |
0d62e5e8 | 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 | ||
54a0b537 PA |
117 | static void linux_resume_one_lwp (struct inferior_list_entry *entry, |
118 | int step, int signal, siginfo_t *info); | |
2bd7c093 | 119 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
54a0b537 | 120 | static void stop_all_lwps (void); |
bd99dc85 | 121 | static int linux_wait_for_event (int pid, int *wstat, int options); |
54a0b537 PA |
122 | static int check_removed_breakpoint (struct lwp_info *event_child); |
123 | static void *add_lwp (unsigned long pid); | |
97438e3f | 124 | static int my_waitpid (int pid, int *status, int flags); |
c35fafde | 125 | static int linux_stopped_by_watchpoint (void); |
0d62e5e8 DJ |
126 | |
127 | struct pending_signals | |
128 | { | |
129 | int signal; | |
32ca6d61 | 130 | siginfo_t info; |
0d62e5e8 DJ |
131 | struct pending_signals *prev; |
132 | }; | |
611cb4a5 | 133 | |
d844cde6 | 134 | #define PTRACE_ARG3_TYPE long |
c6ecbae5 | 135 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 136 | |
58caa3dc | 137 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
138 | static char *disabled_regsets; |
139 | static int num_regsets; | |
58caa3dc DJ |
140 | #endif |
141 | ||
0d62e5e8 | 142 | /* FIXME: Delete eventually. */ |
bd99dc85 PA |
143 | #define inferior_pid (lwpid_of (get_thread_lwp (current_inferior))) |
144 | ||
145 | /* The read/write ends of the pipe registered as waitable file in the | |
146 | event loop. */ | |
147 | static int linux_event_pipe[2] = { -1, -1 }; | |
148 | ||
149 | /* True if we're currently in async mode. */ | |
150 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
151 | ||
152 | static void send_sigstop (struct inferior_list_entry *entry); | |
153 | static void wait_for_sigstop (struct inferior_list_entry *entry); | |
154 | ||
155 | static void | |
156 | delete_lwp (struct lwp_info *lwp) | |
157 | { | |
158 | remove_thread (get_lwp_thread (lwp)); | |
159 | remove_inferior (&all_lwps, &lwp->head); | |
160 | free (lwp); | |
161 | } | |
162 | ||
163 | /* Handle a GNU/Linux extended wait response. If we see a clone | |
164 | event, we need to add the new LWP to our list (and not report the | |
165 | trap to higher layers). */ | |
0d62e5e8 | 166 | |
24a09b5f | 167 | static void |
54a0b537 | 168 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
169 | { |
170 | int event = wstat >> 16; | |
54a0b537 | 171 | struct lwp_info *new_lwp; |
24a09b5f DJ |
172 | |
173 | if (event == PTRACE_EVENT_CLONE) | |
174 | { | |
175 | unsigned long new_pid; | |
836acd6d | 176 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 177 | |
bd99dc85 | 178 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
179 | |
180 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
181 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
182 | { | |
183 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
184 | hits the SIGSTOP, but we're already attached. */ | |
185 | ||
97438e3f | 186 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
187 | |
188 | if (ret == -1) | |
189 | perror_with_name ("waiting for new child"); | |
190 | else if (ret != new_pid) | |
191 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 192 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
193 | warning ("wait returned unexpected status 0x%x", status); |
194 | } | |
195 | ||
196 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE); | |
197 | ||
54a0b537 PA |
198 | new_lwp = (struct lwp_info *) add_lwp (new_pid); |
199 | add_thread (new_pid, new_lwp, new_pid); | |
bd99dc85 | 200 | new_thread_notify (thread_id_to_gdb_id (lwpid_of (new_lwp))); |
24a09b5f | 201 | |
da5898ce DJ |
202 | /* Normally we will get the pending SIGSTOP. But in some cases |
203 | we might get another signal delivered to the group first. | |
f21cc1a2 | 204 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
205 | if (WSTOPSIG (status) == SIGSTOP) |
206 | { | |
207 | if (stopping_threads) | |
54a0b537 | 208 | new_lwp->stopped = 1; |
da5898ce DJ |
209 | else |
210 | ptrace (PTRACE_CONT, new_pid, 0, 0); | |
211 | } | |
24a09b5f | 212 | else |
da5898ce | 213 | { |
54a0b537 | 214 | new_lwp->stop_expected = 1; |
da5898ce DJ |
215 | if (stopping_threads) |
216 | { | |
54a0b537 PA |
217 | new_lwp->stopped = 1; |
218 | new_lwp->status_pending_p = 1; | |
219 | new_lwp->status_pending = status; | |
da5898ce DJ |
220 | } |
221 | else | |
222 | /* Pass the signal on. This is what GDB does - except | |
223 | shouldn't we really report it instead? */ | |
224 | ptrace (PTRACE_CONT, new_pid, 0, WSTOPSIG (status)); | |
225 | } | |
24a09b5f DJ |
226 | |
227 | /* Always resume the current thread. If we are stopping | |
228 | threads, it will have a pending SIGSTOP; we may as well | |
229 | collect it now. */ | |
54a0b537 PA |
230 | linux_resume_one_lwp (&event_child->head, |
231 | event_child->stepping, 0, NULL); | |
24a09b5f DJ |
232 | } |
233 | } | |
234 | ||
0d62e5e8 DJ |
235 | /* This function should only be called if the process got a SIGTRAP. |
236 | The SIGTRAP could mean several things. | |
237 | ||
238 | On i386, where decr_pc_after_break is non-zero: | |
239 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
240 | we will get only the one SIGTRAP (even if the instruction we | |
241 | stepped over was a breakpoint). The value of $eip will be the | |
242 | next instruction. | |
243 | If we continue the process using PTRACE_CONT, we will get a | |
244 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
245 | the instruction after the breakpoint (i.e. needs to be | |
246 | decremented). If we report the SIGTRAP to GDB, we must also | |
247 | report the undecremented PC. If we cancel the SIGTRAP, we | |
248 | must resume at the decremented PC. | |
249 | ||
250 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
251 | with hardware or kernel single-step: | |
252 | If we single-step over a breakpoint instruction, our PC will | |
253 | point at the following instruction. If we continue and hit a | |
254 | breakpoint instruction, our PC will point at the breakpoint | |
255 | instruction. */ | |
256 | ||
257 | static CORE_ADDR | |
258 | get_stop_pc (void) | |
259 | { | |
260 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
261 | ||
54a0b537 | 262 | if (get_thread_lwp (current_inferior)->stepping) |
0d62e5e8 DJ |
263 | return stop_pc; |
264 | else | |
265 | return stop_pc - the_low_target.decr_pc_after_break; | |
266 | } | |
ce3a066d | 267 | |
0d62e5e8 | 268 | static void * |
54a0b537 | 269 | add_lwp (unsigned long pid) |
611cb4a5 | 270 | { |
54a0b537 | 271 | struct lwp_info *lwp; |
0d62e5e8 | 272 | |
54a0b537 PA |
273 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
274 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 275 | |
54a0b537 | 276 | lwp->head.id = pid; |
0d62e5e8 | 277 | |
54a0b537 | 278 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 279 | |
54a0b537 | 280 | return lwp; |
0d62e5e8 | 281 | } |
611cb4a5 | 282 | |
da6d8c04 DJ |
283 | /* Start an inferior process and returns its pid. |
284 | ALLARGS is a vector of program-name and args. */ | |
285 | ||
ce3a066d DJ |
286 | static int |
287 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 288 | { |
54a0b537 | 289 | void *new_lwp; |
da6d8c04 DJ |
290 | int pid; |
291 | ||
42c81e2a | 292 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
293 | pid = vfork (); |
294 | #else | |
da6d8c04 | 295 | pid = fork (); |
52fb6437 | 296 | #endif |
da6d8c04 DJ |
297 | if (pid < 0) |
298 | perror_with_name ("fork"); | |
299 | ||
300 | if (pid == 0) | |
301 | { | |
302 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
303 | ||
254787d4 | 304 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 305 | |
a9fa9f7d DJ |
306 | setpgid (0, 0); |
307 | ||
2b876972 DJ |
308 | execv (program, allargs); |
309 | if (errno == ENOENT) | |
310 | execvp (program, allargs); | |
da6d8c04 DJ |
311 | |
312 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 313 | strerror (errno)); |
da6d8c04 DJ |
314 | fflush (stderr); |
315 | _exit (0177); | |
316 | } | |
317 | ||
54a0b537 PA |
318 | new_lwp = add_lwp (pid); |
319 | add_thread (pid, new_lwp, pid); | |
24a09b5f | 320 | must_set_ptrace_flags = 1; |
d61ddec4 | 321 | new_inferior = 1; |
611cb4a5 | 322 | |
a9fa9f7d | 323 | return pid; |
da6d8c04 DJ |
324 | } |
325 | ||
326 | /* Attach to an inferior process. */ | |
327 | ||
0d62e5e8 | 328 | void |
24a09b5f | 329 | linux_attach_lwp (unsigned long pid) |
da6d8c04 | 330 | { |
54a0b537 | 331 | struct lwp_info *new_lwp; |
611cb4a5 | 332 | |
da6d8c04 DJ |
333 | if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0) |
334 | { | |
2d717e4f DJ |
335 | if (all_threads.head != NULL) |
336 | { | |
337 | /* If we fail to attach to an LWP, just warn. */ | |
54a0b537 | 338 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", pid, |
2d717e4f DJ |
339 | strerror (errno), errno); |
340 | fflush (stderr); | |
341 | return; | |
342 | } | |
343 | else | |
344 | /* If we fail to attach to a process, report an error. */ | |
bd99dc85 | 345 | error ("Cannot attach to lwp %ld: %s (%d)\n", pid, |
43d5792c | 346 | strerror (errno), errno); |
da6d8c04 DJ |
347 | } |
348 | ||
0e21c1ec DE |
349 | /* FIXME: This intermittently fails. |
350 | We need to wait for SIGSTOP first. */ | |
24a09b5f DJ |
351 | ptrace (PTRACE_SETOPTIONS, pid, 0, PTRACE_O_TRACECLONE); |
352 | ||
54a0b537 PA |
353 | new_lwp = (struct lwp_info *) add_lwp (pid); |
354 | add_thread (pid, new_lwp, pid); | |
bd99dc85 | 355 | new_thread_notify (thread_id_to_gdb_id (lwpid_of (new_lwp))); |
0d62e5e8 DJ |
356 | |
357 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH | |
0e21c1ec DE |
358 | brings it to a halt. |
359 | ||
360 | There are several cases to consider here: | |
361 | ||
362 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 PA |
363 | of a new thread that is being created. |
364 | In this case we should ignore that SIGSTOP and resume the process. | |
365 | This is handled below by setting stop_expected = 1. | |
0e21c1ec DE |
366 | |
367 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
368 | to it via attach_inferior. |
369 | In this case we want the process thread to stop. | |
370 | This is handled by having linux_attach clear stop_expected after | |
371 | we return. | |
372 | ??? If the process already has several threads we leave the other | |
373 | threads running. | |
0e21c1ec DE |
374 | |
375 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
376 | existing threads. |
377 | In this case we want the thread to stop. | |
378 | FIXME: This case is currently not properly handled. | |
379 | We should wait for the SIGSTOP but don't. Things work apparently | |
380 | because enough time passes between when we ptrace (ATTACH) and when | |
381 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
382 | |
383 | On the other hand, if we are currently trying to stop all threads, we | |
384 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 385 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
386 | end of the list, and so the new thread has not yet reached |
387 | wait_for_sigstop (but will). */ | |
0d62e5e8 | 388 | if (! stopping_threads) |
54a0b537 | 389 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
390 | } |
391 | ||
392 | int | |
a1928bad | 393 | linux_attach (unsigned long pid) |
0d62e5e8 | 394 | { |
54a0b537 | 395 | struct lwp_info *lwp; |
0d62e5e8 | 396 | |
24a09b5f | 397 | linux_attach_lwp (pid); |
0d62e5e8 | 398 | |
bd99dc85 PA |
399 | if (!non_stop) |
400 | { | |
401 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
402 | process. It will be collected by wait shortly. */ | |
403 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, pid); | |
404 | lwp->stop_expected = 0; | |
405 | } | |
0d62e5e8 | 406 | |
d61ddec4 UW |
407 | new_inferior = 1; |
408 | ||
da6d8c04 DJ |
409 | return 0; |
410 | } | |
411 | ||
412 | /* Kill the inferior process. Make us have no inferior. */ | |
413 | ||
ce3a066d | 414 | static void |
54a0b537 | 415 | linux_kill_one_lwp (struct inferior_list_entry *entry) |
da6d8c04 | 416 | { |
0d62e5e8 | 417 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 418 | struct lwp_info *lwp = get_thread_lwp (thread); |
bd99dc85 | 419 | int pid; |
0d62e5e8 DJ |
420 | int wstat; |
421 | ||
fd500816 DJ |
422 | /* We avoid killing the first thread here, because of a Linux kernel (at |
423 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
424 | the children get a chance to be reaped, it will remain a zombie | |
425 | forever. */ | |
426 | if (entry == all_threads.head) | |
427 | return; | |
428 | ||
bd99dc85 PA |
429 | /* If we're killing a running inferior, make sure it is stopped |
430 | first, as PTRACE_KILL will not work otherwise. */ | |
431 | if (!lwp->stopped) | |
432 | send_sigstop (&lwp->head); | |
433 | ||
0d62e5e8 DJ |
434 | do |
435 | { | |
bd99dc85 | 436 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
437 | |
438 | /* Make sure it died. The loop is most likely unnecessary. */ | |
bd99dc85 PA |
439 | pid = linux_wait_for_event (lwpid_of (lwp), &wstat, __WALL); |
440 | } while (pid > 0 && WIFSTOPPED (wstat)); | |
da6d8c04 DJ |
441 | } |
442 | ||
0d62e5e8 DJ |
443 | static void |
444 | linux_kill (void) | |
445 | { | |
fd500816 | 446 | struct thread_info *thread = (struct thread_info *) all_threads.head; |
54a0b537 | 447 | struct lwp_info *lwp; |
fd500816 | 448 | int wstat; |
bd99dc85 | 449 | int pid; |
fd500816 | 450 | |
9d606399 DJ |
451 | if (thread == NULL) |
452 | return; | |
453 | ||
54a0b537 | 454 | for_each_inferior (&all_threads, linux_kill_one_lwp); |
fd500816 | 455 | |
54a0b537 | 456 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 457 | thread in the list, so do so now. */ |
54a0b537 | 458 | lwp = get_thread_lwp (thread); |
bd99dc85 PA |
459 | |
460 | if (debug_threads) | |
461 | fprintf (stderr, "lk_1: killing lwp %ld\n", lwpid_of (lwp)); | |
462 | ||
463 | /* If we're killing a running inferior, make sure it is stopped | |
464 | first, as PTRACE_KILL will not work otherwise. */ | |
465 | if (!lwp->stopped) | |
466 | send_sigstop (&lwp->head); | |
467 | ||
fd500816 DJ |
468 | do |
469 | { | |
bd99dc85 | 470 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
471 | |
472 | /* Make sure it died. The loop is most likely unnecessary. */ | |
bd99dc85 PA |
473 | pid = linux_wait_for_event (lwpid_of (lwp), &wstat, __WALL); |
474 | } while (pid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 475 | |
bd99dc85 | 476 | delete_lwp (lwp); |
2d717e4f | 477 | clear_inferiors (); |
0d62e5e8 DJ |
478 | } |
479 | ||
6ad8ae5c | 480 | static void |
54a0b537 | 481 | linux_detach_one_lwp (struct inferior_list_entry *entry) |
6ad8ae5c DJ |
482 | { |
483 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 484 | struct lwp_info *lwp = get_thread_lwp (thread); |
6ad8ae5c | 485 | |
bd99dc85 PA |
486 | /* If we're detaching from a running inferior, make sure it is |
487 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
488 | if (!lwp->stopped) | |
489 | { | |
490 | int pid = lwpid_of (lwp); | |
491 | ||
492 | stopping_threads = 1; | |
493 | send_sigstop (&lwp->head); | |
494 | ||
495 | /* If this detects a new thread through a clone event, the new | |
496 | thread is appended to the end of the lwp list, so we'll | |
497 | eventually detach from it. */ | |
498 | wait_for_sigstop (&lwp->head); | |
499 | stopping_threads = 0; | |
500 | ||
501 | /* If LWP exits while we're trying to stop it, there's nothing | |
502 | left to do. */ | |
503 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, pid); | |
504 | if (lwp == NULL) | |
505 | return; | |
506 | } | |
507 | ||
ae13219e DJ |
508 | /* Make sure the process isn't stopped at a breakpoint that's |
509 | no longer there. */ | |
54a0b537 | 510 | check_removed_breakpoint (lwp); |
ae13219e DJ |
511 | |
512 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
513 | sure we take care of that now. This isn't absolutely guaranteed | |
514 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 515 | if (lwp->stop_expected) |
ae13219e | 516 | { |
bd99dc85 | 517 | int wstat; |
ae13219e | 518 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
519 | lwp->stop_expected = 0; |
520 | if (lwp->stopped) | |
521 | linux_resume_one_lwp (&lwp->head, 0, 0, NULL); | |
bd99dc85 | 522 | linux_wait_for_event (lwpid_of (lwp), &wstat, __WALL); |
ae13219e DJ |
523 | } |
524 | ||
525 | /* Flush any pending changes to the process's registers. */ | |
526 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 527 | get_lwp_thread (lwp)); |
ae13219e DJ |
528 | |
529 | /* Finally, let it resume. */ | |
bd99dc85 PA |
530 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
531 | ||
532 | delete_lwp (lwp); | |
6ad8ae5c DJ |
533 | } |
534 | ||
dd6953e1 | 535 | static int |
6ad8ae5c DJ |
536 | linux_detach (void) |
537 | { | |
ae13219e | 538 | delete_all_breakpoints (); |
54a0b537 | 539 | for_each_inferior (&all_threads, linux_detach_one_lwp); |
ae13219e | 540 | clear_inferiors (); |
dd6953e1 | 541 | return 0; |
6ad8ae5c DJ |
542 | } |
543 | ||
444d6139 PA |
544 | static void |
545 | linux_join (void) | |
546 | { | |
444d6139 | 547 | int status, ret; |
bd99dc85 PA |
548 | struct thread_info *thread; |
549 | struct lwp_info *lwp; | |
550 | ||
551 | thread = (struct thread_info *) all_threads.head; | |
552 | lwp = get_thread_lwp (thread); | |
444d6139 PA |
553 | |
554 | do { | |
bd99dc85 | 555 | ret = my_waitpid (lwpid_of (lwp), &status, 0); |
444d6139 PA |
556 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
557 | break; | |
558 | } while (ret != -1 || errno != ECHILD); | |
559 | } | |
560 | ||
6ad8ae5c | 561 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 562 | static int |
24a09b5f | 563 | linux_thread_alive (unsigned long lwpid) |
0d62e5e8 | 564 | { |
24a09b5f | 565 | if (find_inferior_id (&all_threads, lwpid) != NULL) |
0d62e5e8 DJ |
566 | return 1; |
567 | else | |
568 | return 0; | |
569 | } | |
570 | ||
571 | /* Return nonzero if this process stopped at a breakpoint which | |
572 | no longer appears to be inserted. Also adjust the PC | |
573 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 574 | static int |
54a0b537 | 575 | check_removed_breakpoint (struct lwp_info *event_child) |
da6d8c04 | 576 | { |
0d62e5e8 DJ |
577 | CORE_ADDR stop_pc; |
578 | struct thread_info *saved_inferior; | |
579 | ||
580 | if (event_child->pending_is_breakpoint == 0) | |
581 | return 0; | |
582 | ||
583 | if (debug_threads) | |
54a0b537 | 584 | fprintf (stderr, "Checking for breakpoint in lwp %ld.\n", |
bd99dc85 | 585 | lwpid_of (event_child)); |
0d62e5e8 DJ |
586 | |
587 | saved_inferior = current_inferior; | |
54a0b537 | 588 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 DJ |
589 | |
590 | stop_pc = get_stop_pc (); | |
591 | ||
592 | /* If the PC has changed since we stopped, then we shouldn't do | |
593 | anything. This happens if, for instance, GDB handled the | |
594 | decr_pc_after_break subtraction itself. */ | |
595 | if (stop_pc != event_child->pending_stop_pc) | |
596 | { | |
597 | if (debug_threads) | |
ae13219e DJ |
598 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
599 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
600 | |
601 | event_child->pending_is_breakpoint = 0; | |
602 | current_inferior = saved_inferior; | |
603 | return 0; | |
604 | } | |
605 | ||
606 | /* If the breakpoint is still there, we will report hitting it. */ | |
607 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
608 | { | |
609 | if (debug_threads) | |
610 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
611 | current_inferior = saved_inferior; | |
612 | return 0; | |
613 | } | |
614 | ||
615 | if (debug_threads) | |
616 | fprintf (stderr, "Removed breakpoint.\n"); | |
617 | ||
618 | /* For decr_pc_after_break targets, here is where we perform the | |
619 | decrement. We go immediately from this function to resuming, | |
620 | and can not safely call get_stop_pc () again. */ | |
621 | if (the_low_target.set_pc != NULL) | |
622 | (*the_low_target.set_pc) (stop_pc); | |
623 | ||
624 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 625 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
626 | event_child->status_pending_p = 0; |
627 | event_child->status_pending = 0; | |
628 | ||
629 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
630 | return 1; |
631 | } | |
632 | ||
54a0b537 PA |
633 | /* Return 1 if this lwp has an interesting status pending. This |
634 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 635 | static int |
0d62e5e8 DJ |
636 | status_pending_p (struct inferior_list_entry *entry, void *dummy) |
637 | { | |
54a0b537 | 638 | struct lwp_info *lwp = (struct lwp_info *) entry; |
0d62e5e8 | 639 | |
bd99dc85 | 640 | if (lwp->status_pending_p && !lwp->suspended) |
54a0b537 | 641 | if (check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
642 | { |
643 | /* This thread was stopped at a breakpoint, and the breakpoint | |
644 | is now gone. We were told to continue (or step...) all threads, | |
645 | so GDB isn't trying to single-step past this breakpoint. | |
646 | So instead of reporting the old SIGTRAP, pretend we got to | |
647 | the breakpoint just after it was removed instead of just | |
648 | before; resume the process. */ | |
54a0b537 | 649 | linux_resume_one_lwp (&lwp->head, 0, 0, NULL); |
0d62e5e8 DJ |
650 | return 0; |
651 | } | |
652 | ||
bd99dc85 | 653 | return (lwp->status_pending_p && !lwp->suspended); |
0d62e5e8 DJ |
654 | } |
655 | ||
bd99dc85 PA |
656 | static struct lwp_info * |
657 | linux_wait_for_lwp (int pid, int *wstatp, int options) | |
611cb4a5 | 658 | { |
0d62e5e8 | 659 | int ret; |
bd99dc85 PA |
660 | int to_wait_for = pid; |
661 | struct lwp_info *child = NULL; | |
0d62e5e8 | 662 | |
bd99dc85 PA |
663 | if (debug_threads) |
664 | fprintf (stderr, "linux_wait_for_lwp: %d\n", pid); | |
0d62e5e8 | 665 | |
bd99dc85 | 666 | options |= __WALL; |
0d62e5e8 | 667 | |
bd99dc85 | 668 | retry: |
0d62e5e8 | 669 | |
bd99dc85 PA |
670 | ret = my_waitpid (to_wait_for, wstatp, options); |
671 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
672 | return NULL; | |
673 | else if (ret == -1) | |
674 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
675 | |
676 | if (debug_threads | |
677 | && (!WIFSTOPPED (*wstatp) | |
678 | || (WSTOPSIG (*wstatp) != 32 | |
679 | && WSTOPSIG (*wstatp) != 33))) | |
680 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
681 | ||
bd99dc85 | 682 | child = (struct lwp_info *) find_inferior_id (&all_lwps, ret); |
0d62e5e8 | 683 | |
24a09b5f DJ |
684 | /* If we didn't find a process, one of two things presumably happened: |
685 | - A process we started and then detached from has exited. Ignore it. | |
686 | - A process we are controlling has forked and the new child's stop | |
687 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 688 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
689 | { |
690 | add_pid_to_list (&stopped_pids, ret); | |
691 | goto retry; | |
692 | } | |
bd99dc85 | 693 | else if (child == NULL) |
24a09b5f DJ |
694 | goto retry; |
695 | ||
bd99dc85 PA |
696 | child->stopped = 1; |
697 | child->pending_is_breakpoint = 0; | |
0d62e5e8 | 698 | |
bd99dc85 | 699 | child->last_status = *wstatp; |
32ca6d61 | 700 | |
d61ddec4 UW |
701 | /* Architecture-specific setup after inferior is running. |
702 | This needs to happen after we have attached to the inferior | |
703 | and it is stopped for the first time, but before we access | |
704 | any inferior registers. */ | |
705 | if (new_inferior) | |
706 | { | |
707 | the_low_target.arch_setup (); | |
52fa2412 UW |
708 | #ifdef HAVE_LINUX_REGSETS |
709 | memset (disabled_regsets, 0, num_regsets); | |
710 | #endif | |
d61ddec4 UW |
711 | new_inferior = 0; |
712 | } | |
713 | ||
0d62e5e8 DJ |
714 | if (debug_threads |
715 | && WIFSTOPPED (*wstatp)) | |
716 | { | |
896c7fbb | 717 | struct thread_info *saved_inferior = current_inferior; |
0d62e5e8 | 718 | current_inferior = (struct thread_info *) |
bd99dc85 | 719 | find_inferior_id (&all_threads, lwpid_of (child)); |
0d62e5e8 DJ |
720 | /* For testing only; i386_stop_pc prints out a diagnostic. */ |
721 | if (the_low_target.get_pc != NULL) | |
722 | get_stop_pc (); | |
896c7fbb | 723 | current_inferior = saved_inferior; |
0d62e5e8 | 724 | } |
bd99dc85 PA |
725 | |
726 | return child; | |
0d62e5e8 | 727 | } |
611cb4a5 | 728 | |
bd99dc85 PA |
729 | /* Wait for an event from child PID. If PID is -1, wait for any |
730 | child. Store the stop status through the status pointer WSTAT. | |
731 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
732 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
733 | the stopped child otherwise. */ | |
734 | ||
0d62e5e8 | 735 | static int |
bd99dc85 | 736 | linux_wait_for_event (int pid, int *wstat, int options) |
0d62e5e8 DJ |
737 | { |
738 | CORE_ADDR stop_pc; | |
bd99dc85 | 739 | struct lwp_info *event_child = NULL; |
b65d95c5 | 740 | int bp_status; |
bd99dc85 | 741 | struct lwp_info *requested_child = NULL; |
0d62e5e8 DJ |
742 | |
743 | /* Check for a process with a pending status. */ | |
744 | /* It is possible that the user changed the pending task's registers since | |
745 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 746 | (in check_removed_breakpoint); signals should be reported anyway. */ |
bd99dc85 PA |
747 | |
748 | if (pid == -1) | |
0d62e5e8 | 749 | { |
54a0b537 PA |
750 | event_child = (struct lwp_info *) |
751 | find_inferior (&all_lwps, status_pending_p, NULL); | |
0d62e5e8 | 752 | if (debug_threads && event_child) |
bd99dc85 | 753 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
754 | } |
755 | else | |
756 | { | |
bd99dc85 PA |
757 | requested_child = (struct lwp_info *) |
758 | find_inferior_id (&all_lwps, pid); | |
759 | if (requested_child->status_pending_p | |
760 | && !check_removed_breakpoint (requested_child)) | |
761 | event_child = requested_child; | |
0d62e5e8 | 762 | } |
611cb4a5 | 763 | |
0d62e5e8 DJ |
764 | if (event_child != NULL) |
765 | { | |
bd99dc85 PA |
766 | if (debug_threads) |
767 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
768 | lwpid_of (event_child), event_child->status_pending); | |
769 | *wstat = event_child->status_pending; | |
770 | event_child->status_pending_p = 0; | |
771 | event_child->status_pending = 0; | |
772 | current_inferior = get_lwp_thread (event_child); | |
773 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
774 | } |
775 | ||
776 | /* We only enter this loop if no process has a pending wait status. Thus | |
777 | any action taken in response to a wait status inside this loop is | |
778 | responding as soon as we detect the status, not after any pending | |
779 | events. */ | |
780 | while (1) | |
781 | { | |
bd99dc85 | 782 | event_child = linux_wait_for_lwp (pid, wstat, options); |
0d62e5e8 | 783 | |
bd99dc85 PA |
784 | if ((options & WNOHANG) && event_child == NULL) |
785 | return 0; | |
0d62e5e8 DJ |
786 | |
787 | if (event_child == NULL) | |
788 | error ("event from unknown child"); | |
611cb4a5 | 789 | |
bd99dc85 | 790 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 791 | |
89be2091 | 792 | /* Check for thread exit. */ |
bd99dc85 | 793 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 794 | { |
bd99dc85 | 795 | int lwpid = lwpid_of (event_child); |
89be2091 | 796 | if (debug_threads) |
bd99dc85 | 797 | fprintf (stderr, "LWP %d exiting\n", lwpid); |
89be2091 DJ |
798 | |
799 | /* If the last thread is exiting, just return. */ | |
800 | if (all_threads.head == all_threads.tail) | |
bd99dc85 PA |
801 | { |
802 | if (debug_threads) | |
803 | fprintf (stderr, "LWP %d is last lwp of process\n", lwpid); | |
804 | return lwpid_of (event_child); | |
805 | } | |
89be2091 | 806 | |
bd99dc85 PA |
807 | dead_thread_notify (thread_id_to_gdb_id (lwpid_of (event_child))); |
808 | delete_lwp (event_child); | |
89be2091 | 809 | |
bd99dc85 PA |
810 | if (!non_stop) |
811 | { | |
812 | current_inferior = (struct thread_info *) all_threads.head; | |
813 | if (debug_threads) | |
814 | fprintf (stderr, "Current inferior is now %ld\n", | |
815 | lwpid_of (get_thread_lwp (current_inferior))); | |
816 | } | |
817 | else | |
818 | { | |
819 | current_inferior = NULL; | |
820 | if (debug_threads) | |
821 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
822 | } | |
89be2091 DJ |
823 | |
824 | /* If we were waiting for this particular child to do something... | |
825 | well, it did something. */ | |
bd99dc85 PA |
826 | if (requested_child != NULL) |
827 | return lwpid; | |
89be2091 DJ |
828 | |
829 | /* Wait for a more interesting event. */ | |
830 | continue; | |
831 | } | |
832 | ||
bd99dc85 PA |
833 | if (WIFSTOPPED (*wstat) |
834 | && WSTOPSIG (*wstat) == SIGSTOP | |
89be2091 DJ |
835 | && event_child->stop_expected) |
836 | { | |
837 | if (debug_threads) | |
838 | fprintf (stderr, "Expected stop.\n"); | |
839 | event_child->stop_expected = 0; | |
54a0b537 PA |
840 | linux_resume_one_lwp (&event_child->head, |
841 | event_child->stepping, 0, NULL); | |
89be2091 DJ |
842 | continue; |
843 | } | |
844 | ||
bd99dc85 PA |
845 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
846 | && *wstat >> 16 != 0) | |
24a09b5f | 847 | { |
bd99dc85 | 848 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
849 | continue; |
850 | } | |
851 | ||
89be2091 DJ |
852 | /* If GDB is not interested in this signal, don't stop other |
853 | threads, and don't report it to GDB. Just resume the | |
854 | inferior right away. We do this for threading-related | |
69f223ed DJ |
855 | signals as well as any that GDB specifically requested we |
856 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
857 | and do not ignore signals when stepping - they may require | |
858 | special handling to skip the signal handler. */ | |
89be2091 DJ |
859 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
860 | thread library? */ | |
bd99dc85 | 861 | if (WIFSTOPPED (*wstat) |
69f223ed | 862 | && !event_child->stepping |
24a09b5f DJ |
863 | && ( |
864 | #ifdef USE_THREAD_DB | |
bd99dc85 PA |
865 | (thread_db_active |
866 | && (WSTOPSIG (*wstat) == __SIGRTMIN | |
867 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
868 | || |
869 | #endif | |
bd99dc85 PA |
870 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
871 | && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
872 | { |
873 | siginfo_t info, *info_p; | |
874 | ||
875 | if (debug_threads) | |
24a09b5f | 876 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 877 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 878 | |
bd99dc85 | 879 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
880 | info_p = &info; |
881 | else | |
882 | info_p = NULL; | |
54a0b537 PA |
883 | linux_resume_one_lwp (&event_child->head, |
884 | event_child->stepping, | |
bd99dc85 | 885 | WSTOPSIG (*wstat), info_p); |
89be2091 | 886 | continue; |
0d62e5e8 | 887 | } |
611cb4a5 | 888 | |
0d62e5e8 DJ |
889 | /* If this event was not handled above, and is not a SIGTRAP, report |
890 | it. */ | |
bd99dc85 PA |
891 | if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP) |
892 | return lwpid_of (event_child); | |
611cb4a5 | 893 | |
0d62e5e8 DJ |
894 | /* If this target does not support breakpoints, we simply report the |
895 | SIGTRAP; it's of no concern to us. */ | |
896 | if (the_low_target.get_pc == NULL) | |
bd99dc85 | 897 | return lwpid_of (event_child); |
0d62e5e8 DJ |
898 | |
899 | stop_pc = get_stop_pc (); | |
900 | ||
901 | /* bp_reinsert will only be set if we were single-stepping. | |
902 | Notice that we will resume the process after hitting | |
903 | a gdbserver breakpoint; single-stepping to/over one | |
904 | is not supported (yet). */ | |
905 | if (event_child->bp_reinsert != 0) | |
906 | { | |
907 | if (debug_threads) | |
908 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
909 | reinsert_breakpoint (event_child->bp_reinsert); | |
910 | event_child->bp_reinsert = 0; | |
911 | ||
912 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
54a0b537 | 913 | linux_resume_one_lwp (&event_child->head, 0, 0, NULL); |
0d62e5e8 DJ |
914 | continue; |
915 | } | |
916 | ||
b65d95c5 | 917 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 918 | |
b65d95c5 | 919 | if (bp_status != 0) |
0d62e5e8 | 920 | { |
b65d95c5 DJ |
921 | if (debug_threads) |
922 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
923 | ||
0d62e5e8 | 924 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 925 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
926 | adjustment for us at the appropriate time. */ |
927 | event_child->pending_is_breakpoint = 1; | |
928 | event_child->pending_stop_pc = stop_pc; | |
929 | ||
b65d95c5 | 930 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
931 | loop instead of simply replacing the breakpoint right away, |
932 | in order to not lose signals sent to the thread that hit the | |
933 | breakpoint. Unfortunately this increases the window where another | |
934 | thread could sneak past the removed breakpoint. For the current | |
935 | use of server-side breakpoints (thread creation) this is | |
936 | acceptable; but it needs to be considered before this breakpoint | |
937 | mechanism can be used in more general ways. For some breakpoints | |
938 | it may be necessary to stop all other threads, but that should | |
939 | be avoided where possible. | |
940 | ||
941 | If breakpoint_reinsert_addr is NULL, that means that we can | |
942 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
943 | mark it for reinsertion, and single-step. | |
944 | ||
945 | Otherwise, call the target function to figure out where we need | |
946 | our temporary breakpoint, create it, and continue executing this | |
947 | process. */ | |
bd99dc85 PA |
948 | |
949 | /* NOTE: we're lifting breakpoints in non-stop mode. This | |
950 | is currently only used for thread event breakpoints, so | |
951 | it isn't that bad as long as we have PTRACE_EVENT_CLONE | |
952 | events. */ | |
b65d95c5 DJ |
953 | if (bp_status == 2) |
954 | /* No need to reinsert. */ | |
54a0b537 | 955 | linux_resume_one_lwp (&event_child->head, 0, 0, NULL); |
b65d95c5 | 956 | else if (the_low_target.breakpoint_reinsert_addr == NULL) |
0d62e5e8 DJ |
957 | { |
958 | event_child->bp_reinsert = stop_pc; | |
959 | uninsert_breakpoint (stop_pc); | |
54a0b537 | 960 | linux_resume_one_lwp (&event_child->head, 1, 0, NULL); |
0d62e5e8 DJ |
961 | } |
962 | else | |
963 | { | |
964 | reinsert_breakpoint_by_bp | |
965 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
54a0b537 | 966 | linux_resume_one_lwp (&event_child->head, 0, 0, NULL); |
611cb4a5 | 967 | } |
0d62e5e8 DJ |
968 | |
969 | continue; | |
970 | } | |
971 | ||
b65d95c5 DJ |
972 | if (debug_threads) |
973 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
974 | ||
0d62e5e8 | 975 | /* If we were single-stepping, we definitely want to report the |
c35fafde PA |
976 | SIGTRAP. Although the single-step operation has completed, |
977 | do not clear clear the stepping flag yet; we need to check it | |
978 | in wait_for_sigstop. */ | |
0d62e5e8 | 979 | if (event_child->stepping) |
bd99dc85 | 980 | return lwpid_of (event_child); |
0d62e5e8 DJ |
981 | |
982 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
983 | Check if it is a breakpoint, and if so mark the process information | |
984 | accordingly. This will handle both the necessary fiddling with the | |
985 | PC on decr_pc_after_break targets and suppressing extra threads | |
986 | hitting a breakpoint if two hit it at once and then GDB removes it | |
987 | after the first is reported. Arguably it would be better to report | |
988 | multiple threads hitting breakpoints simultaneously, but the current | |
989 | remote protocol does not allow this. */ | |
990 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
991 | { | |
992 | event_child->pending_is_breakpoint = 1; | |
993 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
994 | } |
995 | ||
bd99dc85 | 996 | return lwpid_of (event_child); |
611cb4a5 | 997 | } |
0d62e5e8 | 998 | |
611cb4a5 DJ |
999 | /* NOTREACHED */ |
1000 | return 0; | |
1001 | } | |
1002 | ||
0d62e5e8 | 1003 | /* Wait for process, returns status. */ |
da6d8c04 | 1004 | |
5b1c542e | 1005 | static unsigned long |
bd99dc85 | 1006 | linux_wait_1 (struct target_waitstatus *ourstatus, int target_options) |
da6d8c04 | 1007 | { |
e5f1222d | 1008 | int w; |
bd99dc85 PA |
1009 | struct thread_info *thread = NULL; |
1010 | struct lwp_info *lwp = NULL; | |
1011 | int options; | |
1012 | int wait_pid = -1; | |
1013 | int pid; | |
1014 | ||
1015 | /* Translate generic target options into linux options. */ | |
1016 | options = __WALL; | |
1017 | if (target_options & TARGET_WNOHANG) | |
1018 | options |= WNOHANG; | |
0d62e5e8 DJ |
1019 | |
1020 | retry: | |
bd99dc85 PA |
1021 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1022 | ||
0d62e5e8 DJ |
1023 | /* If we were only supposed to resume one thread, only wait for |
1024 | that thread - if it's still alive. If it died, however - which | |
1025 | can happen if we're coming from the thread death case below - | |
1026 | then we need to make sure we restart the other threads. We could | |
1027 | pick a thread at random or restart all; restarting all is less | |
1028 | arbitrary. */ | |
bd99dc85 | 1029 | if (!non_stop && cont_thread != 0 && cont_thread != -1) |
0d62e5e8 | 1030 | { |
bd99dc85 PA |
1031 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1032 | cont_thread); | |
0d62e5e8 DJ |
1033 | |
1034 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1035 | if (thread == NULL) |
64386c31 DJ |
1036 | { |
1037 | struct thread_resume resume_info; | |
1038 | resume_info.thread = -1; | |
bd99dc85 PA |
1039 | resume_info.kind = resume_continue; |
1040 | resume_info.sig = 0; | |
2bd7c093 | 1041 | linux_resume (&resume_info, 1); |
64386c31 | 1042 | } |
bd99dc85 PA |
1043 | else |
1044 | wait_pid = cont_thread; | |
0d62e5e8 | 1045 | } |
da6d8c04 | 1046 | |
bd99dc85 PA |
1047 | pid = linux_wait_for_event (wait_pid, &w, options); |
1048 | if (pid == 0) /* only if TARGET_WNOHANG */ | |
1049 | return pid; | |
1050 | ||
1051 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1052 | |
24a09b5f DJ |
1053 | if (must_set_ptrace_flags) |
1054 | { | |
bd99dc85 | 1055 | ptrace (PTRACE_SETOPTIONS, lwpid_of (lwp), 0, PTRACE_O_TRACECLONE); |
24a09b5f DJ |
1056 | must_set_ptrace_flags = 0; |
1057 | } | |
0d62e5e8 DJ |
1058 | /* If we are waiting for a particular child, and it exited, |
1059 | linux_wait_for_event will return its exit status. Similarly if | |
1060 | the last child exited. If this is not the last child, however, | |
1061 | do not report it as exited until there is a 'thread exited' response | |
1062 | available in the remote protocol. Instead, just wait for another event. | |
1063 | This should be safe, because if the thread crashed we will already | |
1064 | have reported the termination signal to GDB; that should stop any | |
1065 | in-progress stepping operations, etc. | |
1066 | ||
1067 | Report the exit status of the last thread to exit. This matches | |
1068 | LinuxThreads' behavior. */ | |
1069 | ||
1070 | if (all_threads.head == all_threads.tail) | |
da6d8c04 | 1071 | { |
bd99dc85 | 1072 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1073 | { |
bd99dc85 PA |
1074 | int pid; |
1075 | ||
1076 | pid = pid_of (lwp); | |
5b1c542e | 1077 | |
bd99dc85 | 1078 | delete_lwp (lwp); |
0d62e5e8 | 1079 | clear_inferiors (); |
5b1c542e | 1080 | |
bd99dc85 | 1081 | current_inferior = NULL; |
5b1c542e | 1082 | |
bd99dc85 PA |
1083 | if (WIFEXITED (w)) |
1084 | { | |
1085 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1086 | ourstatus->value.integer = WEXITSTATUS (w); | |
1087 | ||
1088 | if (debug_threads) | |
1089 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1090 | } | |
1091 | else | |
1092 | { | |
1093 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1094 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1095 | ||
1096 | if (debug_threads) | |
1097 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1098 | ||
1099 | } | |
5b1c542e PA |
1100 | |
1101 | return pid; | |
0d62e5e8 | 1102 | } |
da6d8c04 | 1103 | } |
0d62e5e8 | 1104 | else |
da6d8c04 | 1105 | { |
0d62e5e8 DJ |
1106 | if (!WIFSTOPPED (w)) |
1107 | goto retry; | |
da6d8c04 DJ |
1108 | } |
1109 | ||
bd99dc85 PA |
1110 | /* In all-stop, stop all threads. Be careful to only do this if |
1111 | we're about to report an event to GDB. */ | |
1112 | if (!non_stop) | |
1113 | stop_all_lwps (); | |
1114 | ||
5b1c542e | 1115 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1116 | |
bd99dc85 PA |
1117 | if (lwp->suspended && WSTOPSIG (w) == SIGSTOP) |
1118 | { | |
1119 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1120 | and it stopped cleanly, so report as SIG0. The use of | |
1121 | SIGSTOP is an implementation detail. */ | |
1122 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1123 | } | |
1124 | else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP) | |
1125 | { | |
1126 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1127 | but, it stopped for other reasons. Set stop_expected so the | |
1128 | pending SIGSTOP is ignored and the LWP is resumed. */ | |
1129 | lwp->stop_expected = 1; | |
1130 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1131 | } | |
1132 | else | |
1133 | { | |
1134 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1135 | } | |
1136 | ||
1137 | if (debug_threads) | |
1138 | fprintf (stderr, "linux_wait ret = %ld, %d, %d\n", | |
1139 | lwpid_of (lwp), | |
1140 | ourstatus->kind, | |
1141 | ourstatus->value.sig); | |
1142 | ||
1143 | return lwpid_of (lwp); | |
1144 | } | |
1145 | ||
1146 | /* Get rid of any pending event in the pipe. */ | |
1147 | static void | |
1148 | async_file_flush (void) | |
1149 | { | |
1150 | int ret; | |
1151 | char buf; | |
1152 | ||
1153 | do | |
1154 | ret = read (linux_event_pipe[0], &buf, 1); | |
1155 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1156 | } | |
1157 | ||
1158 | /* Put something in the pipe, so the event loop wakes up. */ | |
1159 | static void | |
1160 | async_file_mark (void) | |
1161 | { | |
1162 | int ret; | |
1163 | ||
1164 | async_file_flush (); | |
1165 | ||
1166 | do | |
1167 | ret = write (linux_event_pipe[1], "+", 1); | |
1168 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1169 | ||
1170 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1171 | be awakened anyway. */ | |
1172 | } | |
1173 | ||
1174 | static unsigned long | |
1175 | linux_wait (struct target_waitstatus *ourstatus, int target_options) | |
1176 | { | |
1177 | unsigned long event_ptid; | |
1178 | ||
1179 | if (debug_threads) | |
1180 | fprintf (stderr, "linux_wait\n"); | |
1181 | ||
1182 | /* Flush the async file first. */ | |
1183 | if (target_is_async_p ()) | |
1184 | async_file_flush (); | |
1185 | ||
1186 | event_ptid = linux_wait_1 (ourstatus, target_options); | |
1187 | ||
1188 | /* If at least one stop was reported, there may be more. A single | |
1189 | SIGCHLD can signal more than one child stop. */ | |
1190 | if (target_is_async_p () | |
1191 | && (target_options & TARGET_WNOHANG) != 0 | |
1192 | && event_ptid != 0) | |
1193 | async_file_mark (); | |
1194 | ||
1195 | return event_ptid; | |
da6d8c04 DJ |
1196 | } |
1197 | ||
fd500816 DJ |
1198 | /* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if |
1199 | thread groups are in use, we need to use tkill. */ | |
1200 | ||
1201 | static int | |
a1928bad | 1202 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 DJ |
1203 | { |
1204 | static int tkill_failed; | |
1205 | ||
1206 | errno = 0; | |
1207 | ||
1208 | #ifdef SYS_tkill | |
1209 | if (!tkill_failed) | |
1210 | { | |
1211 | int ret = syscall (SYS_tkill, lwpid, signo); | |
1212 | if (errno != ENOSYS) | |
1b3f6016 | 1213 | return ret; |
fd500816 DJ |
1214 | errno = 0; |
1215 | tkill_failed = 1; | |
1216 | } | |
1217 | #endif | |
1218 | ||
1219 | return kill (lwpid, signo); | |
1220 | } | |
1221 | ||
0d62e5e8 DJ |
1222 | static void |
1223 | send_sigstop (struct inferior_list_entry *entry) | |
1224 | { | |
54a0b537 | 1225 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1226 | int pid; |
0d62e5e8 | 1227 | |
54a0b537 | 1228 | if (lwp->stopped) |
0d62e5e8 DJ |
1229 | return; |
1230 | ||
bd99dc85 PA |
1231 | pid = lwpid_of (lwp); |
1232 | ||
0d62e5e8 DJ |
1233 | /* If we already have a pending stop signal for this process, don't |
1234 | send another. */ | |
54a0b537 | 1235 | if (lwp->stop_expected) |
0d62e5e8 | 1236 | { |
ae13219e | 1237 | if (debug_threads) |
bd99dc85 | 1238 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e DJ |
1239 | |
1240 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1241 | will receive the SIGSTOP event (instead of silently resuming and | |
1242 | waiting again). It'll be reset below. */ | |
54a0b537 | 1243 | lwp->stop_expected = 0; |
0d62e5e8 DJ |
1244 | return; |
1245 | } | |
1246 | ||
1247 | if (debug_threads) | |
bd99dc85 | 1248 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1249 | |
bd99dc85 | 1250 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1251 | } |
1252 | ||
1253 | static void | |
1254 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1255 | { | |
54a0b537 | 1256 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1257 | struct thread_info *saved_inferior; |
a1928bad DJ |
1258 | int wstat; |
1259 | unsigned long saved_tid; | |
bd99dc85 | 1260 | unsigned long ptid; |
0d62e5e8 | 1261 | |
54a0b537 | 1262 | if (lwp->stopped) |
0d62e5e8 DJ |
1263 | return; |
1264 | ||
1265 | saved_inferior = current_inferior; | |
bd99dc85 PA |
1266 | if (saved_inferior != NULL) |
1267 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1268 | else | |
1269 | saved_tid = 0; /* avoid bogus unused warning */ | |
1270 | ||
1271 | ptid = lwpid_of (lwp); | |
1272 | ||
1273 | linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
1274 | |
1275 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1276 | and record the pending SIGSTOP. If the process exited, just | |
1277 | return. */ | |
1278 | if (WIFSTOPPED (wstat) | |
1279 | && WSTOPSIG (wstat) != SIGSTOP) | |
1280 | { | |
1281 | if (debug_threads) | |
24a09b5f | 1282 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
bd99dc85 | 1283 | lwpid_of (lwp), wstat); |
c35fafde PA |
1284 | |
1285 | /* Do not leave a pending single-step finish to be reported to | |
1286 | the client. The client will give us a new action for this | |
1287 | thread, possibly a continue request --- otherwise, the client | |
1288 | would consider this pending SIGTRAP reported later a spurious | |
1289 | signal. */ | |
1290 | if (WSTOPSIG (wstat) == SIGTRAP | |
1291 | && lwp->stepping | |
1292 | && !linux_stopped_by_watchpoint ()) | |
1293 | { | |
1294 | if (debug_threads) | |
1295 | fprintf (stderr, " single-step SIGTRAP ignored\n"); | |
1296 | } | |
1297 | else | |
1298 | { | |
1299 | lwp->status_pending_p = 1; | |
1300 | lwp->status_pending = wstat; | |
1301 | } | |
54a0b537 | 1302 | lwp->stop_expected = 1; |
0d62e5e8 DJ |
1303 | } |
1304 | ||
bd99dc85 | 1305 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
1306 | current_inferior = saved_inferior; |
1307 | else | |
1308 | { | |
1309 | if (debug_threads) | |
1310 | fprintf (stderr, "Previously current thread died.\n"); | |
1311 | ||
bd99dc85 PA |
1312 | if (non_stop) |
1313 | { | |
1314 | /* We can't change the current inferior behind GDB's back, | |
1315 | otherwise, a subsequent command may apply to the wrong | |
1316 | process. */ | |
1317 | current_inferior = NULL; | |
1318 | } | |
1319 | else | |
1320 | { | |
1321 | /* Set a valid thread as current. */ | |
1322 | set_desired_inferior (0); | |
1323 | } | |
0d62e5e8 DJ |
1324 | } |
1325 | } | |
1326 | ||
1327 | static void | |
54a0b537 | 1328 | stop_all_lwps (void) |
0d62e5e8 DJ |
1329 | { |
1330 | stopping_threads = 1; | |
54a0b537 PA |
1331 | for_each_inferior (&all_lwps, send_sigstop); |
1332 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
1333 | stopping_threads = 0; |
1334 | } | |
1335 | ||
da6d8c04 DJ |
1336 | /* Resume execution of the inferior process. |
1337 | If STEP is nonzero, single-step it. | |
1338 | If SIGNAL is nonzero, give it that signal. */ | |
1339 | ||
ce3a066d | 1340 | static void |
54a0b537 PA |
1341 | linux_resume_one_lwp (struct inferior_list_entry *entry, |
1342 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 1343 | { |
54a0b537 | 1344 | struct lwp_info *lwp = (struct lwp_info *) entry; |
0d62e5e8 DJ |
1345 | struct thread_info *saved_inferior; |
1346 | ||
54a0b537 | 1347 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
1348 | return; |
1349 | ||
1350 | /* If we have pending signals or status, and a new signal, enqueue the | |
1351 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1352 | breakpoint; it will be picked up again below. */ | |
1353 | if (signal != 0 | |
54a0b537 PA |
1354 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
1355 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
1356 | { |
1357 | struct pending_signals *p_sig; | |
bca929d3 | 1358 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 1359 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 1360 | p_sig->signal = signal; |
32ca6d61 DJ |
1361 | if (info == NULL) |
1362 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1363 | else | |
1364 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 1365 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
1366 | } |
1367 | ||
54a0b537 | 1368 | if (lwp->status_pending_p && !check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
1369 | return; |
1370 | ||
1371 | saved_inferior = current_inferior; | |
54a0b537 | 1372 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
1373 | |
1374 | if (debug_threads) | |
1b3f6016 | 1375 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 1376 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 1377 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
1378 | |
1379 | /* This bit needs some thinking about. If we get a signal that | |
1380 | we must report while a single-step reinsert is still pending, | |
1381 | we often end up resuming the thread. It might be better to | |
1382 | (ew) allow a stack of pending events; then we could be sure that | |
1383 | the reinsert happened right away and not lose any signals. | |
1384 | ||
1385 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 1386 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
1387 | complete correctness, so it won't solve that problem. It may be |
1388 | worthwhile just to solve this one, however. */ | |
54a0b537 | 1389 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
1390 | { |
1391 | if (debug_threads) | |
54a0b537 | 1392 | fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert); |
0d62e5e8 DJ |
1393 | if (step == 0) |
1394 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1395 | step = 1; | |
1396 | ||
1397 | /* Postpone any pending signal. It was enqueued above. */ | |
1398 | signal = 0; | |
1399 | } | |
1400 | ||
54a0b537 | 1401 | check_removed_breakpoint (lwp); |
0d62e5e8 | 1402 | |
aa691b87 | 1403 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 DJ |
1404 | { |
1405 | fprintf (stderr, " "); | |
52fb6437 | 1406 | (*the_low_target.get_pc) (); |
0d62e5e8 DJ |
1407 | } |
1408 | ||
1409 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1410 | a breakpoint. */ | |
54a0b537 | 1411 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
1412 | { |
1413 | struct pending_signals **p_sig; | |
1414 | ||
54a0b537 | 1415 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
1416 | while ((*p_sig)->prev != NULL) |
1417 | p_sig = &(*p_sig)->prev; | |
1418 | ||
1419 | signal = (*p_sig)->signal; | |
32ca6d61 | 1420 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 1421 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 1422 | |
0d62e5e8 DJ |
1423 | free (*p_sig); |
1424 | *p_sig = NULL; | |
1425 | } | |
1426 | ||
1427 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 1428 | get_lwp_thread (lwp)); |
da6d8c04 | 1429 | errno = 0; |
54a0b537 PA |
1430 | lwp->stopped = 0; |
1431 | lwp->stepping = step; | |
bd99dc85 | 1432 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal); |
0d62e5e8 DJ |
1433 | |
1434 | current_inferior = saved_inferior; | |
da6d8c04 | 1435 | if (errno) |
3221518c UW |
1436 | { |
1437 | /* ESRCH from ptrace either means that the thread was already | |
1438 | running (an error) or that it is gone (a race condition). If | |
1439 | it's gone, we will get a notification the next time we wait, | |
1440 | so we can ignore the error. We could differentiate these | |
1441 | two, but it's tricky without waiting; the thread still exists | |
1442 | as a zombie, so sending it signal 0 would succeed. So just | |
1443 | ignore ESRCH. */ | |
1444 | if (errno == ESRCH) | |
1445 | return; | |
1446 | ||
1447 | perror_with_name ("ptrace"); | |
1448 | } | |
da6d8c04 DJ |
1449 | } |
1450 | ||
2bd7c093 PA |
1451 | struct thread_resume_array |
1452 | { | |
1453 | struct thread_resume *resume; | |
1454 | size_t n; | |
1455 | }; | |
64386c31 DJ |
1456 | |
1457 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1458 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1459 | resume request. | |
1460 | ||
1461 | This algorithm is O(threads * resume elements), but resume elements | |
1462 | is small (and will remain small at least until GDB supports thread | |
1463 | suspension). */ | |
2bd7c093 PA |
1464 | static int |
1465 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 1466 | { |
54a0b537 | 1467 | struct lwp_info *lwp; |
64386c31 | 1468 | struct thread_info *thread; |
5544ad89 | 1469 | int ndx; |
2bd7c093 | 1470 | struct thread_resume_array *r; |
64386c31 DJ |
1471 | |
1472 | thread = (struct thread_info *) entry; | |
54a0b537 | 1473 | lwp = get_thread_lwp (thread); |
2bd7c093 | 1474 | r = arg; |
64386c31 | 1475 | |
2bd7c093 PA |
1476 | for (ndx = 0; ndx < r->n; ndx++) |
1477 | if (r->resume[ndx].thread == -1 || r->resume[ndx].thread == entry->id) | |
1478 | { | |
1479 | lwp->resume = &r->resume[ndx]; | |
1480 | return 0; | |
1481 | } | |
1482 | ||
1483 | /* No resume action for this thread. */ | |
1484 | lwp->resume = NULL; | |
64386c31 | 1485 | |
2bd7c093 | 1486 | return 0; |
5544ad89 DJ |
1487 | } |
1488 | ||
5544ad89 | 1489 | |
bd99dc85 PA |
1490 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
1491 | static int | |
1492 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 1493 | { |
bd99dc85 | 1494 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 1495 | |
bd99dc85 PA |
1496 | /* LWPs which will not be resumed are not interesting, because |
1497 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 1498 | if (lwp->resume == NULL) |
bd99dc85 | 1499 | return 0; |
64386c31 | 1500 | |
bd99dc85 PA |
1501 | /* If this thread has a removed breakpoint, we won't have any |
1502 | events to report later, so check now. check_removed_breakpoint | |
1503 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1504 | for any thread that we are not otherwise going to resume - this | |
1505 | lets us preserve stopped status when two threads hit a breakpoint. | |
1506 | GDB removes the breakpoint to single-step a particular thread | |
1507 | past it, then re-inserts it and resumes all threads. We want | |
1508 | to report the second thread without resuming it in the interim. */ | |
1509 | if (lwp->status_pending_p) | |
1510 | check_removed_breakpoint (lwp); | |
5544ad89 | 1511 | |
bd99dc85 PA |
1512 | if (lwp->status_pending_p) |
1513 | * (int *) flag_p = 1; | |
c6ecbae5 | 1514 | |
bd99dc85 | 1515 | return 0; |
5544ad89 DJ |
1516 | } |
1517 | ||
1518 | /* This function is called once per thread. We check the thread's resume | |
1519 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 1520 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 1521 | |
bd99dc85 PA |
1522 | For threads which we aren't explicitly told otherwise, we preserve |
1523 | the stepping flag; this is used for stepping over gdbserver-placed | |
1524 | breakpoints. | |
1525 | ||
1526 | If pending_flags was set in any thread, we queue any needed | |
1527 | signals, since we won't actually resume. We already have a pending | |
1528 | event to report, so we don't need to preserve any step requests; | |
1529 | they should be re-issued if necessary. */ | |
1530 | ||
1531 | static int | |
1532 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 1533 | { |
54a0b537 | 1534 | struct lwp_info *lwp; |
5544ad89 | 1535 | struct thread_info *thread; |
bd99dc85 PA |
1536 | int step; |
1537 | int pending_flag = * (int *) arg; | |
5544ad89 DJ |
1538 | |
1539 | thread = (struct thread_info *) entry; | |
54a0b537 | 1540 | lwp = get_thread_lwp (thread); |
5544ad89 | 1541 | |
2bd7c093 | 1542 | if (lwp->resume == NULL) |
bd99dc85 | 1543 | return 0; |
5544ad89 | 1544 | |
bd99dc85 | 1545 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 1546 | { |
bd99dc85 PA |
1547 | if (debug_threads) |
1548 | fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp)); | |
1549 | ||
1550 | if (!lwp->stopped) | |
1551 | { | |
1552 | if (debug_threads) | |
1553 | fprintf (stderr, "running -> suspending %ld\n", lwpid_of (lwp)); | |
1554 | ||
1555 | lwp->suspended = 1; | |
1556 | send_sigstop (&lwp->head); | |
1557 | } | |
1558 | else | |
1559 | { | |
1560 | if (debug_threads) | |
1561 | { | |
1562 | if (lwp->suspended) | |
1563 | fprintf (stderr, "already stopped/suspended LWP %ld\n", | |
1564 | lwpid_of (lwp)); | |
1565 | else | |
1566 | fprintf (stderr, "already stopped/not suspended LWP %ld\n", | |
1567 | lwpid_of (lwp)); | |
1568 | } | |
32ca6d61 | 1569 | |
bd99dc85 PA |
1570 | /* Make sure we leave the LWP suspended, so we don't try to |
1571 | resume it without GDB telling us to. FIXME: The LWP may | |
1572 | have been stopped in an internal event that was not meant | |
1573 | to be notified back to GDB (e.g., gdbserver breakpoint), | |
1574 | so we should be reporting a stop event in that case | |
1575 | too. */ | |
1576 | lwp->suspended = 1; | |
1577 | } | |
32ca6d61 | 1578 | |
bd99dc85 PA |
1579 | /* For stop requests, we're done. */ |
1580 | lwp->resume = NULL; | |
1581 | return 0; | |
5544ad89 | 1582 | } |
bd99dc85 PA |
1583 | else |
1584 | lwp->suspended = 0; | |
5544ad89 | 1585 | |
bd99dc85 PA |
1586 | /* If this thread which is about to be resumed has a pending status, |
1587 | then don't resume any threads - we can just report the pending | |
1588 | status. Make sure to queue any signals that would otherwise be | |
1589 | sent. In all-stop mode, we do this decision based on if *any* | |
1590 | thread has a pending status. */ | |
1591 | if (non_stop) | |
1592 | resume_status_pending_p (&lwp->head, &pending_flag); | |
5544ad89 | 1593 | |
bd99dc85 PA |
1594 | if (!pending_flag) |
1595 | { | |
1596 | if (debug_threads) | |
1597 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 1598 | |
bd99dc85 PA |
1599 | if (lwp->resume->thread == -1 |
1600 | && lwp->stepping | |
1601 | && lwp->pending_is_breakpoint) | |
1602 | step = 1; | |
1603 | else | |
1604 | step = (lwp->resume->kind == resume_step); | |
5544ad89 | 1605 | |
bd99dc85 PA |
1606 | linux_resume_one_lwp (&lwp->head, step, lwp->resume->sig, NULL); |
1607 | } | |
1608 | else | |
1609 | { | |
1610 | if (debug_threads) | |
1611 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 1612 | |
bd99dc85 PA |
1613 | /* If we have a new signal, enqueue the signal. */ |
1614 | if (lwp->resume->sig != 0) | |
1615 | { | |
1616 | struct pending_signals *p_sig; | |
1617 | p_sig = xmalloc (sizeof (*p_sig)); | |
1618 | p_sig->prev = lwp->pending_signals; | |
1619 | p_sig->signal = lwp->resume->sig; | |
1620 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1621 | ||
1622 | /* If this is the same signal we were previously stopped by, | |
1623 | make sure to queue its siginfo. We can ignore the return | |
1624 | value of ptrace; if it fails, we'll skip | |
1625 | PTRACE_SETSIGINFO. */ | |
1626 | if (WIFSTOPPED (lwp->last_status) | |
1627 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
1628 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1629 | ||
1630 | lwp->pending_signals = p_sig; | |
1631 | } | |
1632 | } | |
5544ad89 | 1633 | |
bd99dc85 | 1634 | lwp->resume = NULL; |
5544ad89 | 1635 | return 0; |
0d62e5e8 DJ |
1636 | } |
1637 | ||
1638 | static void | |
2bd7c093 | 1639 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 1640 | { |
5544ad89 | 1641 | int pending_flag; |
2bd7c093 | 1642 | struct thread_resume_array array = { resume_info, n }; |
c6ecbae5 | 1643 | |
2bd7c093 | 1644 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 DJ |
1645 | |
1646 | /* If there is a thread which would otherwise be resumed, which | |
1647 | has a pending status, then don't resume any threads - we can just | |
1648 | report the pending status. Make sure to queue any signals | |
bd99dc85 PA |
1649 | that would otherwise be sent. In non-stop mode, we'll apply this |
1650 | logic to each thread individually. */ | |
5544ad89 | 1651 | pending_flag = 0; |
bd99dc85 PA |
1652 | if (!non_stop) |
1653 | find_inferior (&all_lwps, resume_status_pending_p, &pending_flag); | |
5544ad89 DJ |
1654 | |
1655 | if (debug_threads) | |
1656 | { | |
1657 | if (pending_flag) | |
1658 | fprintf (stderr, "Not resuming, pending status\n"); | |
1659 | else | |
1660 | fprintf (stderr, "Resuming, no pending status\n"); | |
1661 | } | |
1662 | ||
bd99dc85 | 1663 | find_inferior (&all_threads, linux_resume_one_thread, &pending_flag); |
0d62e5e8 DJ |
1664 | } |
1665 | ||
1666 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
1667 | |
1668 | int | |
0a30fbc4 | 1669 | register_addr (int regnum) |
da6d8c04 DJ |
1670 | { |
1671 | int addr; | |
1672 | ||
2ec06d2e | 1673 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
1674 | error ("Invalid register number %d.", regnum); |
1675 | ||
2ec06d2e | 1676 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
1677 | |
1678 | return addr; | |
1679 | } | |
1680 | ||
58caa3dc | 1681 | /* Fetch one register. */ |
da6d8c04 DJ |
1682 | static void |
1683 | fetch_register (int regno) | |
1684 | { | |
1685 | CORE_ADDR regaddr; | |
48d93c75 | 1686 | int i, size; |
0d62e5e8 | 1687 | char *buf; |
da6d8c04 | 1688 | |
2ec06d2e | 1689 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 1690 | return; |
2ec06d2e | 1691 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 1692 | return; |
da6d8c04 | 1693 | |
0a30fbc4 DJ |
1694 | regaddr = register_addr (regno); |
1695 | if (regaddr == -1) | |
1696 | return; | |
1b3f6016 PA |
1697 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
1698 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
1699 | buf = alloca (size); |
1700 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
1701 | { |
1702 | errno = 0; | |
0d62e5e8 | 1703 | *(PTRACE_XFER_TYPE *) (buf + i) = |
da6d8c04 DJ |
1704 | ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
1705 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
1706 | if (errno != 0) | |
1707 | { | |
1708 | /* Warning, not error, in case we are attached; sometimes the | |
1709 | kernel doesn't let us at the registers. */ | |
1710 | char *err = strerror (errno); | |
1711 | char *msg = alloca (strlen (err) + 128); | |
1712 | sprintf (msg, "reading register %d: %s", regno, err); | |
1713 | error (msg); | |
1714 | goto error_exit; | |
1715 | } | |
1716 | } | |
ee1a7ae4 UW |
1717 | |
1718 | if (the_low_target.supply_ptrace_register) | |
1719 | the_low_target.supply_ptrace_register (regno, buf); | |
5a1f5858 DJ |
1720 | else |
1721 | supply_register (regno, buf); | |
0d62e5e8 | 1722 | |
da6d8c04 DJ |
1723 | error_exit:; |
1724 | } | |
1725 | ||
1726 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
1727 | static void |
1728 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 DJ |
1729 | { |
1730 | if (regno == -1 || regno == 0) | |
2ec06d2e | 1731 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
1732 | fetch_register (regno); |
1733 | else | |
1734 | fetch_register (regno); | |
1735 | } | |
1736 | ||
1737 | /* Store our register values back into the inferior. | |
1738 | If REGNO is -1, do this for all registers. | |
1739 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
1740 | static void |
1741 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
1742 | { |
1743 | CORE_ADDR regaddr; | |
48d93c75 | 1744 | int i, size; |
0d62e5e8 | 1745 | char *buf; |
da6d8c04 DJ |
1746 | |
1747 | if (regno >= 0) | |
1748 | { | |
2ec06d2e | 1749 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
1750 | return; |
1751 | ||
bc1e36ca | 1752 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
1753 | return; |
1754 | ||
1755 | regaddr = register_addr (regno); | |
1756 | if (regaddr == -1) | |
da6d8c04 | 1757 | return; |
da6d8c04 | 1758 | errno = 0; |
48d93c75 UW |
1759 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
1760 | & - sizeof (PTRACE_XFER_TYPE); | |
1761 | buf = alloca (size); | |
1762 | memset (buf, 0, size); | |
ee1a7ae4 UW |
1763 | |
1764 | if (the_low_target.collect_ptrace_register) | |
1765 | the_low_target.collect_ptrace_register (regno, buf); | |
5a1f5858 DJ |
1766 | else |
1767 | collect_register (regno, buf); | |
ee1a7ae4 | 1768 | |
48d93c75 | 1769 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 1770 | { |
0a30fbc4 DJ |
1771 | errno = 0; |
1772 | ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
2ff29de4 | 1773 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
1774 | if (errno != 0) |
1775 | { | |
1b3f6016 PA |
1776 | /* At this point, ESRCH should mean the process is |
1777 | already gone, in which case we simply ignore attempts | |
1778 | to change its registers. See also the related | |
1779 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
1780 | if (errno == ESRCH) |
1781 | return; | |
1782 | ||
bc1e36ca DJ |
1783 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
1784 | { | |
1785 | char *err = strerror (errno); | |
1786 | char *msg = alloca (strlen (err) + 128); | |
1787 | sprintf (msg, "writing register %d: %s", | |
1788 | regno, err); | |
1789 | error (msg); | |
1790 | return; | |
1791 | } | |
da6d8c04 | 1792 | } |
2ff29de4 | 1793 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 1794 | } |
da6d8c04 DJ |
1795 | } |
1796 | else | |
2ec06d2e | 1797 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 1798 | usr_store_inferior_registers (regno); |
da6d8c04 | 1799 | } |
58caa3dc DJ |
1800 | #endif /* HAVE_LINUX_USRREGS */ |
1801 | ||
1802 | ||
1803 | ||
1804 | #ifdef HAVE_LINUX_REGSETS | |
1805 | ||
1806 | static int | |
0d62e5e8 | 1807 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
1808 | { |
1809 | struct regset_info *regset; | |
e9d25b98 | 1810 | int saw_general_regs = 0; |
58caa3dc DJ |
1811 | |
1812 | regset = target_regsets; | |
1813 | ||
1814 | while (regset->size >= 0) | |
1815 | { | |
1816 | void *buf; | |
1817 | int res; | |
1818 | ||
52fa2412 | 1819 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
1820 | { |
1821 | regset ++; | |
1822 | continue; | |
1823 | } | |
1824 | ||
bca929d3 | 1825 | buf = xmalloc (regset->size); |
dfb64f85 | 1826 | #ifndef __sparc__ |
d06f167a | 1827 | res = ptrace (regset->get_request, inferior_pid, 0, buf); |
dfb64f85 DJ |
1828 | #else |
1829 | res = ptrace (regset->get_request, inferior_pid, buf, 0); | |
1830 | #endif | |
58caa3dc DJ |
1831 | if (res < 0) |
1832 | { | |
1833 | if (errno == EIO) | |
1834 | { | |
52fa2412 UW |
1835 | /* If we get EIO on a regset, do not try it again for |
1836 | this process. */ | |
1837 | disabled_regsets[regset - target_regsets] = 1; | |
1838 | continue; | |
58caa3dc DJ |
1839 | } |
1840 | else | |
1841 | { | |
0d62e5e8 | 1842 | char s[256]; |
a1928bad | 1843 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%ld", |
0d62e5e8 DJ |
1844 | inferior_pid); |
1845 | perror (s); | |
58caa3dc DJ |
1846 | } |
1847 | } | |
e9d25b98 DJ |
1848 | else if (regset->type == GENERAL_REGS) |
1849 | saw_general_regs = 1; | |
58caa3dc DJ |
1850 | regset->store_function (buf); |
1851 | regset ++; | |
1852 | } | |
e9d25b98 DJ |
1853 | if (saw_general_regs) |
1854 | return 0; | |
1855 | else | |
1856 | return 1; | |
58caa3dc DJ |
1857 | } |
1858 | ||
1859 | static int | |
0d62e5e8 | 1860 | regsets_store_inferior_registers () |
58caa3dc DJ |
1861 | { |
1862 | struct regset_info *regset; | |
e9d25b98 | 1863 | int saw_general_regs = 0; |
58caa3dc DJ |
1864 | |
1865 | regset = target_regsets; | |
1866 | ||
1867 | while (regset->size >= 0) | |
1868 | { | |
1869 | void *buf; | |
1870 | int res; | |
1871 | ||
52fa2412 | 1872 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
1873 | { |
1874 | regset ++; | |
1875 | continue; | |
1876 | } | |
1877 | ||
bca929d3 | 1878 | buf = xmalloc (regset->size); |
545587ee DJ |
1879 | |
1880 | /* First fill the buffer with the current register set contents, | |
1881 | in case there are any items in the kernel's regset that are | |
1882 | not in gdbserver's regcache. */ | |
dfb64f85 | 1883 | #ifndef __sparc__ |
545587ee | 1884 | res = ptrace (regset->get_request, inferior_pid, 0, buf); |
dfb64f85 DJ |
1885 | #else |
1886 | res = ptrace (regset->get_request, inferior_pid, buf, 0); | |
1887 | #endif | |
545587ee DJ |
1888 | |
1889 | if (res == 0) | |
1890 | { | |
1891 | /* Then overlay our cached registers on that. */ | |
1892 | regset->fill_function (buf); | |
1893 | ||
1894 | /* Only now do we write the register set. */ | |
dfb64f85 | 1895 | #ifndef __sparc__ |
1b3f6016 | 1896 | res = ptrace (regset->set_request, inferior_pid, 0, buf); |
dfb64f85 | 1897 | #else |
1b3f6016 | 1898 | res = ptrace (regset->set_request, inferior_pid, buf, 0); |
dfb64f85 | 1899 | #endif |
545587ee DJ |
1900 | } |
1901 | ||
58caa3dc DJ |
1902 | if (res < 0) |
1903 | { | |
1904 | if (errno == EIO) | |
1905 | { | |
52fa2412 UW |
1906 | /* If we get EIO on a regset, do not try it again for |
1907 | this process. */ | |
1908 | disabled_regsets[regset - target_regsets] = 1; | |
1909 | continue; | |
58caa3dc | 1910 | } |
3221518c UW |
1911 | else if (errno == ESRCH) |
1912 | { | |
1b3f6016 PA |
1913 | /* At this point, ESRCH should mean the process is |
1914 | already gone, in which case we simply ignore attempts | |
1915 | to change its registers. See also the related | |
1916 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
1917 | return 0; |
1918 | } | |
58caa3dc DJ |
1919 | else |
1920 | { | |
ce3a066d | 1921 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
1922 | } |
1923 | } | |
e9d25b98 DJ |
1924 | else if (regset->type == GENERAL_REGS) |
1925 | saw_general_regs = 1; | |
58caa3dc | 1926 | regset ++; |
09ec9b38 | 1927 | free (buf); |
58caa3dc | 1928 | } |
e9d25b98 DJ |
1929 | if (saw_general_regs) |
1930 | return 0; | |
1931 | else | |
1932 | return 1; | |
ce3a066d | 1933 | return 0; |
58caa3dc DJ |
1934 | } |
1935 | ||
1936 | #endif /* HAVE_LINUX_REGSETS */ | |
1937 | ||
1938 | ||
1939 | void | |
ce3a066d | 1940 | linux_fetch_registers (int regno) |
58caa3dc DJ |
1941 | { |
1942 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
1943 | if (regsets_fetch_inferior_registers () == 0) |
1944 | return; | |
58caa3dc DJ |
1945 | #endif |
1946 | #ifdef HAVE_LINUX_USRREGS | |
1947 | usr_fetch_inferior_registers (regno); | |
1948 | #endif | |
1949 | } | |
1950 | ||
1951 | void | |
ce3a066d | 1952 | linux_store_registers (int regno) |
58caa3dc DJ |
1953 | { |
1954 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
1955 | if (regsets_store_inferior_registers () == 0) |
1956 | return; | |
58caa3dc DJ |
1957 | #endif |
1958 | #ifdef HAVE_LINUX_USRREGS | |
1959 | usr_store_inferior_registers (regno); | |
1960 | #endif | |
1961 | } | |
1962 | ||
da6d8c04 | 1963 | |
da6d8c04 DJ |
1964 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
1965 | to debugger memory starting at MYADDR. */ | |
1966 | ||
c3e735a6 | 1967 | static int |
f450004a | 1968 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
1969 | { |
1970 | register int i; | |
1971 | /* Round starting address down to longword boundary. */ | |
1972 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
1973 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
1974 | register int count |
1975 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
1976 | / sizeof (PTRACE_XFER_TYPE); |
1977 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 1978 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 1979 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
1980 | int fd; |
1981 | char filename[64]; | |
1982 | ||
1983 | /* Try using /proc. Don't bother for one word. */ | |
1984 | if (len >= 3 * sizeof (long)) | |
1985 | { | |
1986 | /* We could keep this file open and cache it - possibly one per | |
1987 | thread. That requires some juggling, but is even faster. */ | |
1988 | sprintf (filename, "/proc/%ld/mem", inferior_pid); | |
1989 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
1990 | if (fd == -1) | |
1991 | goto no_proc; | |
1992 | ||
1993 | /* If pread64 is available, use it. It's faster if the kernel | |
1994 | supports it (only one syscall), and it's 64-bit safe even on | |
1995 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
1996 | application). */ | |
1997 | #ifdef HAVE_PREAD64 | |
1998 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
1999 | #else | |
2000 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len) | |
2001 | #endif | |
2002 | { | |
2003 | close (fd); | |
2004 | goto no_proc; | |
2005 | } | |
2006 | ||
2007 | close (fd); | |
2008 | return 0; | |
2009 | } | |
da6d8c04 | 2010 | |
fd462a61 | 2011 | no_proc: |
da6d8c04 DJ |
2012 | /* Read all the longwords */ |
2013 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2014 | { | |
c3e735a6 | 2015 | errno = 0; |
1b3f6016 PA |
2016 | buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, |
2017 | (PTRACE_ARG3_TYPE) addr, 0); | |
c3e735a6 DJ |
2018 | if (errno) |
2019 | return errno; | |
da6d8c04 DJ |
2020 | } |
2021 | ||
2022 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
2023 | memcpy (myaddr, |
2024 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
2025 | len); | |
c3e735a6 DJ |
2026 | |
2027 | return 0; | |
da6d8c04 DJ |
2028 | } |
2029 | ||
2030 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
2031 | to inferior's memory at MEMADDR. | |
2032 | On failure (cannot write the inferior) | |
2033 | returns the value of errno. */ | |
2034 | ||
ce3a066d | 2035 | static int |
f450004a | 2036 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
2037 | { |
2038 | register int i; | |
2039 | /* Round starting address down to longword boundary. */ | |
2040 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2041 | /* Round ending address up; get number of longwords that makes. */ | |
2042 | register int count | |
2043 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
2044 | /* Allocate buffer of that many longwords. */ | |
2045 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
da6d8c04 | 2046 | |
0d62e5e8 DJ |
2047 | if (debug_threads) |
2048 | { | |
2049 | fprintf (stderr, "Writing %02x to %08lx\n", (unsigned)myaddr[0], (long)memaddr); | |
2050 | } | |
2051 | ||
da6d8c04 DJ |
2052 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
2053 | ||
d844cde6 DJ |
2054 | buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid, |
2055 | (PTRACE_ARG3_TYPE) addr, 0); | |
da6d8c04 DJ |
2056 | |
2057 | if (count > 1) | |
2058 | { | |
2059 | buffer[count - 1] | |
2060 | = ptrace (PTRACE_PEEKTEXT, inferior_pid, | |
d844cde6 DJ |
2061 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
2062 | * sizeof (PTRACE_XFER_TYPE)), | |
2063 | 0); | |
da6d8c04 DJ |
2064 | } |
2065 | ||
2066 | /* Copy data to be written over corresponding part of buffer */ | |
2067 | ||
2068 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
2069 | ||
2070 | /* Write the entire buffer. */ | |
2071 | ||
2072 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2073 | { | |
2074 | errno = 0; | |
d844cde6 | 2075 | ptrace (PTRACE_POKETEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
2076 | if (errno) |
2077 | return errno; | |
2078 | } | |
2079 | ||
2080 | return 0; | |
2081 | } | |
2f2893d9 | 2082 | |
24a09b5f DJ |
2083 | static int linux_supports_tracefork_flag; |
2084 | ||
51c2684e | 2085 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 2086 | |
51c2684e DJ |
2087 | static int |
2088 | linux_tracefork_grandchild (void *arg) | |
2089 | { | |
2090 | _exit (0); | |
2091 | } | |
2092 | ||
7407e2de AS |
2093 | #define STACK_SIZE 4096 |
2094 | ||
51c2684e DJ |
2095 | static int |
2096 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
2097 | { |
2098 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
2099 | kill (getpid (), SIGSTOP); | |
7407e2de AS |
2100 | #ifdef __ia64__ |
2101 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
2102 | CLONE_VM | SIGCHLD, NULL); | |
2103 | #else | |
2104 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
2105 | CLONE_VM | SIGCHLD, NULL); | |
2106 | #endif | |
24a09b5f DJ |
2107 | _exit (0); |
2108 | } | |
2109 | ||
bd99dc85 PA |
2110 | /* Wrapper function for waitpid which handles EINTR, and emulates |
2111 | __WALL for systems where that is not available. */ | |
24a09b5f DJ |
2112 | |
2113 | static int | |
2114 | my_waitpid (int pid, int *status, int flags) | |
2115 | { | |
bd99dc85 PA |
2116 | int ret, out_errno; |
2117 | ||
2118 | if (debug_threads) | |
2119 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
2120 | ||
2121 | if (flags & __WALL) | |
24a09b5f | 2122 | { |
bd99dc85 PA |
2123 | sigset_t block_mask, org_mask, wake_mask; |
2124 | int wnohang; | |
2125 | ||
2126 | wnohang = (flags & WNOHANG) != 0; | |
2127 | flags &= ~(__WALL | __WCLONE); | |
2128 | flags |= WNOHANG; | |
2129 | ||
2130 | /* Block all signals while here. This avoids knowing about | |
2131 | LinuxThread's signals. */ | |
2132 | sigfillset (&block_mask); | |
2133 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
2134 | ||
2135 | /* ... except during the sigsuspend below. */ | |
2136 | sigemptyset (&wake_mask); | |
2137 | ||
2138 | while (1) | |
2139 | { | |
2140 | /* Since all signals are blocked, there's no need to check | |
2141 | for EINTR here. */ | |
2142 | ret = waitpid (pid, status, flags); | |
2143 | out_errno = errno; | |
2144 | ||
2145 | if (ret == -1 && out_errno != ECHILD) | |
2146 | break; | |
2147 | else if (ret > 0) | |
2148 | break; | |
2149 | ||
2150 | if (flags & __WCLONE) | |
2151 | { | |
2152 | /* We've tried both flavors now. If WNOHANG is set, | |
2153 | there's nothing else to do, just bail out. */ | |
2154 | if (wnohang) | |
2155 | break; | |
2156 | ||
2157 | if (debug_threads) | |
2158 | fprintf (stderr, "blocking\n"); | |
2159 | ||
2160 | /* Block waiting for signals. */ | |
2161 | sigsuspend (&wake_mask); | |
2162 | } | |
2163 | ||
2164 | flags ^= __WCLONE; | |
2165 | } | |
2166 | ||
2167 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
24a09b5f | 2168 | } |
bd99dc85 PA |
2169 | else |
2170 | { | |
2171 | do | |
2172 | ret = waitpid (pid, status, flags); | |
2173 | while (ret == -1 && errno == EINTR); | |
2174 | out_errno = errno; | |
2175 | } | |
2176 | ||
2177 | if (debug_threads) | |
2178 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
2179 | pid, flags, status ? *status : -1, ret); | |
24a09b5f | 2180 | |
bd99dc85 | 2181 | errno = out_errno; |
24a09b5f DJ |
2182 | return ret; |
2183 | } | |
2184 | ||
2185 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make | |
2186 | sure that we can enable the option, and that it had the desired | |
2187 | effect. */ | |
2188 | ||
2189 | static void | |
2190 | linux_test_for_tracefork (void) | |
2191 | { | |
2192 | int child_pid, ret, status; | |
2193 | long second_pid; | |
bca929d3 | 2194 | char *stack = xmalloc (STACK_SIZE * 4); |
24a09b5f DJ |
2195 | |
2196 | linux_supports_tracefork_flag = 0; | |
2197 | ||
51c2684e | 2198 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
2199 | #ifdef __ia64__ |
2200 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
2201 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2202 | #else | |
2203 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, | |
2204 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2205 | #endif | |
24a09b5f | 2206 | if (child_pid == -1) |
51c2684e | 2207 | perror_with_name ("clone"); |
24a09b5f DJ |
2208 | |
2209 | ret = my_waitpid (child_pid, &status, 0); | |
2210 | if (ret == -1) | |
2211 | perror_with_name ("waitpid"); | |
2212 | else if (ret != child_pid) | |
2213 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
2214 | if (! WIFSTOPPED (status)) | |
2215 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
2216 | ||
2217 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); | |
2218 | if (ret != 0) | |
2219 | { | |
2220 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2221 | if (ret != 0) | |
2222 | { | |
2223 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2224 | return; | |
2225 | } | |
2226 | ||
2227 | ret = my_waitpid (child_pid, &status, 0); | |
2228 | if (ret != child_pid) | |
2229 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
2230 | else if (!WIFSIGNALED (status)) | |
2231 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
2232 | "killed child", status); | |
2233 | ||
2234 | return; | |
2235 | } | |
2236 | ||
2237 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
2238 | if (ret != 0) | |
2239 | warning ("linux_test_for_tracefork: failed to resume child"); | |
2240 | ||
2241 | ret = my_waitpid (child_pid, &status, 0); | |
2242 | ||
2243 | if (ret == child_pid && WIFSTOPPED (status) | |
2244 | && status >> 16 == PTRACE_EVENT_FORK) | |
2245 | { | |
2246 | second_pid = 0; | |
2247 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
2248 | if (ret == 0 && second_pid != 0) | |
2249 | { | |
2250 | int second_status; | |
2251 | ||
2252 | linux_supports_tracefork_flag = 1; | |
2253 | my_waitpid (second_pid, &second_status, 0); | |
2254 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
2255 | if (ret != 0) | |
2256 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
2257 | my_waitpid (second_pid, &status, 0); | |
2258 | } | |
2259 | } | |
2260 | else | |
2261 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
2262 | "(%d, status 0x%x)", ret, status); | |
2263 | ||
2264 | do | |
2265 | { | |
2266 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2267 | if (ret != 0) | |
2268 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2269 | my_waitpid (child_pid, &status, 0); | |
2270 | } | |
2271 | while (WIFSTOPPED (status)); | |
51c2684e DJ |
2272 | |
2273 | free (stack); | |
24a09b5f DJ |
2274 | } |
2275 | ||
2276 | ||
2f2893d9 DJ |
2277 | static void |
2278 | linux_look_up_symbols (void) | |
2279 | { | |
0d62e5e8 | 2280 | #ifdef USE_THREAD_DB |
24a09b5f | 2281 | if (thread_db_active) |
0d62e5e8 DJ |
2282 | return; |
2283 | ||
24a09b5f | 2284 | thread_db_active = thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
2285 | #endif |
2286 | } | |
2287 | ||
e5379b03 | 2288 | static void |
ef57601b | 2289 | linux_request_interrupt (void) |
e5379b03 | 2290 | { |
a1928bad | 2291 | extern unsigned long signal_pid; |
e5379b03 | 2292 | |
d592fa2f | 2293 | if (cont_thread != 0 && cont_thread != -1) |
e5379b03 | 2294 | { |
54a0b537 | 2295 | struct lwp_info *lwp; |
bd99dc85 | 2296 | int lwpid; |
e5379b03 | 2297 | |
54a0b537 | 2298 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
2299 | lwpid = lwpid_of (lwp); |
2300 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
2301 | } |
2302 | else | |
ef57601b | 2303 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
2304 | } |
2305 | ||
aa691b87 RM |
2306 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
2307 | to debugger memory starting at MYADDR. */ | |
2308 | ||
2309 | static int | |
f450004a | 2310 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
2311 | { |
2312 | char filename[PATH_MAX]; | |
2313 | int fd, n; | |
2314 | ||
a1928bad | 2315 | snprintf (filename, sizeof filename, "/proc/%ld/auxv", inferior_pid); |
aa691b87 RM |
2316 | |
2317 | fd = open (filename, O_RDONLY); | |
2318 | if (fd < 0) | |
2319 | return -1; | |
2320 | ||
2321 | if (offset != (CORE_ADDR) 0 | |
2322 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
2323 | n = -1; | |
2324 | else | |
2325 | n = read (fd, myaddr, len); | |
2326 | ||
2327 | close (fd); | |
2328 | ||
2329 | return n; | |
2330 | } | |
2331 | ||
e013ee27 OF |
2332 | /* These watchpoint related wrapper functions simply pass on the function call |
2333 | if the target has registered a corresponding function. */ | |
2334 | ||
2335 | static int | |
2336 | linux_insert_watchpoint (char type, CORE_ADDR addr, int len) | |
2337 | { | |
2338 | if (the_low_target.insert_watchpoint != NULL) | |
2339 | return the_low_target.insert_watchpoint (type, addr, len); | |
2340 | else | |
2341 | /* Unsupported (see target.h). */ | |
2342 | return 1; | |
2343 | } | |
2344 | ||
2345 | static int | |
2346 | linux_remove_watchpoint (char type, CORE_ADDR addr, int len) | |
2347 | { | |
2348 | if (the_low_target.remove_watchpoint != NULL) | |
2349 | return the_low_target.remove_watchpoint (type, addr, len); | |
2350 | else | |
2351 | /* Unsupported (see target.h). */ | |
2352 | return 1; | |
2353 | } | |
2354 | ||
2355 | static int | |
2356 | linux_stopped_by_watchpoint (void) | |
2357 | { | |
2358 | if (the_low_target.stopped_by_watchpoint != NULL) | |
2359 | return the_low_target.stopped_by_watchpoint (); | |
2360 | else | |
2361 | return 0; | |
2362 | } | |
2363 | ||
2364 | static CORE_ADDR | |
2365 | linux_stopped_data_address (void) | |
2366 | { | |
2367 | if (the_low_target.stopped_data_address != NULL) | |
2368 | return the_low_target.stopped_data_address (); | |
2369 | else | |
2370 | return 0; | |
2371 | } | |
2372 | ||
42c81e2a | 2373 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
2374 | #if defined(__mcoldfire__) |
2375 | /* These should really be defined in the kernel's ptrace.h header. */ | |
2376 | #define PT_TEXT_ADDR 49*4 | |
2377 | #define PT_DATA_ADDR 50*4 | |
2378 | #define PT_TEXT_END_ADDR 51*4 | |
2379 | #endif | |
2380 | ||
2381 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
2382 | to tell gdb about. */ | |
2383 | ||
2384 | static int | |
2385 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
2386 | { | |
2387 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
2388 | unsigned long text, text_end, data; | |
bd99dc85 | 2389 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
2390 | |
2391 | errno = 0; | |
2392 | ||
2393 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
2394 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
2395 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
2396 | ||
2397 | if (errno == 0) | |
2398 | { | |
2399 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
2400 | used by gdb) are relative to the beginning of the program, |
2401 | with the data segment immediately following the text segment. | |
2402 | However, the actual runtime layout in memory may put the data | |
2403 | somewhere else, so when we send gdb a data base-address, we | |
2404 | use the real data base address and subtract the compile-time | |
2405 | data base-address from it (which is just the length of the | |
2406 | text segment). BSS immediately follows data in both | |
2407 | cases. */ | |
52fb6437 NS |
2408 | *text_p = text; |
2409 | *data_p = data - (text_end - text); | |
1b3f6016 | 2410 | |
52fb6437 NS |
2411 | return 1; |
2412 | } | |
2413 | #endif | |
2414 | return 0; | |
2415 | } | |
2416 | #endif | |
2417 | ||
07e059b5 VP |
2418 | static int |
2419 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
2420 | unsigned char *readbuf, unsigned const char *writebuf, |
2421 | CORE_ADDR offset, int len) | |
07e059b5 VP |
2422 | { |
2423 | /* We make the process list snapshot when the object starts to be | |
2424 | read. */ | |
2425 | static const char *buf; | |
2426 | static long len_avail = -1; | |
2427 | static struct buffer buffer; | |
2428 | ||
2429 | DIR *dirp; | |
2430 | ||
2431 | if (strcmp (annex, "processes") != 0) | |
2432 | return 0; | |
2433 | ||
2434 | if (!readbuf || writebuf) | |
2435 | return 0; | |
2436 | ||
2437 | if (offset == 0) | |
2438 | { | |
2439 | if (len_avail != -1 && len_avail != 0) | |
2440 | buffer_free (&buffer); | |
2441 | len_avail = 0; | |
2442 | buf = NULL; | |
2443 | buffer_init (&buffer); | |
2444 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
2445 | ||
2446 | dirp = opendir ("/proc"); | |
2447 | if (dirp) | |
2448 | { | |
1b3f6016 PA |
2449 | struct dirent *dp; |
2450 | while ((dp = readdir (dirp)) != NULL) | |
2451 | { | |
2452 | struct stat statbuf; | |
2453 | char procentry[sizeof ("/proc/4294967295")]; | |
2454 | ||
2455 | if (!isdigit (dp->d_name[0]) | |
2456 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
2457 | continue; | |
2458 | ||
2459 | sprintf (procentry, "/proc/%s", dp->d_name); | |
2460 | if (stat (procentry, &statbuf) == 0 | |
2461 | && S_ISDIR (statbuf.st_mode)) | |
2462 | { | |
2463 | char pathname[128]; | |
2464 | FILE *f; | |
2465 | char cmd[MAXPATHLEN + 1]; | |
2466 | struct passwd *entry; | |
2467 | ||
2468 | sprintf (pathname, "/proc/%s/cmdline", dp->d_name); | |
2469 | entry = getpwuid (statbuf.st_uid); | |
2470 | ||
2471 | if ((f = fopen (pathname, "r")) != NULL) | |
2472 | { | |
2473 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
2474 | if (len > 0) | |
2475 | { | |
2476 | int i; | |
2477 | for (i = 0; i < len; i++) | |
2478 | if (cmd[i] == '\0') | |
2479 | cmd[i] = ' '; | |
2480 | cmd[len] = '\0'; | |
2481 | ||
2482 | buffer_xml_printf ( | |
07e059b5 VP |
2483 | &buffer, |
2484 | "<item>" | |
2485 | "<column name=\"pid\">%s</column>" | |
2486 | "<column name=\"user\">%s</column>" | |
2487 | "<column name=\"command\">%s</column>" | |
2488 | "</item>", | |
2489 | dp->d_name, | |
2490 | entry ? entry->pw_name : "?", | |
2491 | cmd); | |
1b3f6016 PA |
2492 | } |
2493 | fclose (f); | |
2494 | } | |
2495 | } | |
2496 | } | |
07e059b5 | 2497 | |
1b3f6016 | 2498 | closedir (dirp); |
07e059b5 VP |
2499 | } |
2500 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
2501 | buf = buffer_finish (&buffer); | |
2502 | len_avail = strlen (buf); | |
2503 | } | |
2504 | ||
2505 | if (offset >= len_avail) | |
2506 | { | |
2507 | /* Done. Get rid of the data. */ | |
2508 | buffer_free (&buffer); | |
2509 | buf = NULL; | |
2510 | len_avail = 0; | |
2511 | return 0; | |
2512 | } | |
2513 | ||
2514 | if (len > len_avail - offset) | |
2515 | len = len_avail - offset; | |
2516 | memcpy (readbuf, buf + offset, len); | |
2517 | ||
2518 | return len; | |
2519 | } | |
2520 | ||
4aa995e1 PA |
2521 | static int |
2522 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
2523 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
2524 | { | |
2525 | struct siginfo siginfo; | |
2526 | long pid = -1; | |
2527 | ||
2528 | if (current_inferior == NULL) | |
2529 | return -1; | |
2530 | ||
bd99dc85 | 2531 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
2532 | |
2533 | if (debug_threads) | |
2534 | fprintf (stderr, "%s siginfo for lwp %ld.\n", | |
2535 | readbuf != NULL ? "Reading" : "Writing", | |
2536 | pid); | |
2537 | ||
2538 | if (offset > sizeof (siginfo)) | |
2539 | return -1; | |
2540 | ||
2541 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
2542 | return -1; | |
2543 | ||
2544 | if (offset + len > sizeof (siginfo)) | |
2545 | len = sizeof (siginfo) - offset; | |
2546 | ||
2547 | if (readbuf != NULL) | |
2548 | memcpy (readbuf, (char *) &siginfo + offset, len); | |
2549 | else | |
2550 | { | |
2551 | memcpy ((char *) &siginfo + offset, writebuf, len); | |
2552 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) | |
2553 | return -1; | |
2554 | } | |
2555 | ||
2556 | return len; | |
2557 | } | |
2558 | ||
bd99dc85 PA |
2559 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
2560 | so we notice when children change state; as the handler for the | |
2561 | sigsuspend in my_waitpid. */ | |
2562 | ||
2563 | static void | |
2564 | sigchld_handler (int signo) | |
2565 | { | |
2566 | int old_errno = errno; | |
2567 | ||
2568 | if (debug_threads) | |
2569 | /* fprintf is not async-signal-safe, so call write directly. */ | |
2570 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
2571 | ||
2572 | if (target_is_async_p ()) | |
2573 | async_file_mark (); /* trigger a linux_wait */ | |
2574 | ||
2575 | errno = old_errno; | |
2576 | } | |
2577 | ||
2578 | static int | |
2579 | linux_supports_non_stop (void) | |
2580 | { | |
2581 | return 1; | |
2582 | } | |
2583 | ||
2584 | static int | |
2585 | linux_async (int enable) | |
2586 | { | |
2587 | int previous = (linux_event_pipe[0] != -1); | |
2588 | ||
2589 | if (previous != enable) | |
2590 | { | |
2591 | sigset_t mask; | |
2592 | sigemptyset (&mask); | |
2593 | sigaddset (&mask, SIGCHLD); | |
2594 | ||
2595 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
2596 | ||
2597 | if (enable) | |
2598 | { | |
2599 | if (pipe (linux_event_pipe) == -1) | |
2600 | fatal ("creating event pipe failed."); | |
2601 | ||
2602 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
2603 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
2604 | ||
2605 | /* Register the event loop handler. */ | |
2606 | add_file_handler (linux_event_pipe[0], | |
2607 | handle_target_event, NULL); | |
2608 | ||
2609 | /* Always trigger a linux_wait. */ | |
2610 | async_file_mark (); | |
2611 | } | |
2612 | else | |
2613 | { | |
2614 | delete_file_handler (linux_event_pipe[0]); | |
2615 | ||
2616 | close (linux_event_pipe[0]); | |
2617 | close (linux_event_pipe[1]); | |
2618 | linux_event_pipe[0] = -1; | |
2619 | linux_event_pipe[1] = -1; | |
2620 | } | |
2621 | ||
2622 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
2623 | } | |
2624 | ||
2625 | return previous; | |
2626 | } | |
2627 | ||
2628 | static int | |
2629 | linux_start_non_stop (int nonstop) | |
2630 | { | |
2631 | /* Register or unregister from event-loop accordingly. */ | |
2632 | linux_async (nonstop); | |
2633 | return 0; | |
2634 | } | |
2635 | ||
ce3a066d DJ |
2636 | static struct target_ops linux_target_ops = { |
2637 | linux_create_inferior, | |
2638 | linux_attach, | |
2639 | linux_kill, | |
6ad8ae5c | 2640 | linux_detach, |
444d6139 | 2641 | linux_join, |
ce3a066d DJ |
2642 | linux_thread_alive, |
2643 | linux_resume, | |
2644 | linux_wait, | |
2645 | linux_fetch_registers, | |
2646 | linux_store_registers, | |
2647 | linux_read_memory, | |
2648 | linux_write_memory, | |
2f2893d9 | 2649 | linux_look_up_symbols, |
ef57601b | 2650 | linux_request_interrupt, |
aa691b87 | 2651 | linux_read_auxv, |
e013ee27 OF |
2652 | linux_insert_watchpoint, |
2653 | linux_remove_watchpoint, | |
2654 | linux_stopped_by_watchpoint, | |
2655 | linux_stopped_data_address, | |
42c81e2a | 2656 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 2657 | linux_read_offsets, |
dae5f5cf DJ |
2658 | #else |
2659 | NULL, | |
2660 | #endif | |
2661 | #ifdef USE_THREAD_DB | |
2662 | thread_db_get_tls_address, | |
2663 | #else | |
2664 | NULL, | |
52fb6437 | 2665 | #endif |
59a016f0 PA |
2666 | NULL, |
2667 | hostio_last_error_from_errno, | |
07e059b5 | 2668 | linux_qxfer_osdata, |
4aa995e1 | 2669 | linux_xfer_siginfo, |
bd99dc85 PA |
2670 | linux_supports_non_stop, |
2671 | linux_async, | |
2672 | linux_start_non_stop, | |
ce3a066d DJ |
2673 | }; |
2674 | ||
0d62e5e8 DJ |
2675 | static void |
2676 | linux_init_signals () | |
2677 | { | |
2678 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
2679 | to find what the cancel signal actually is. */ | |
254787d4 | 2680 | signal (__SIGRTMIN+1, SIG_IGN); |
0d62e5e8 DJ |
2681 | } |
2682 | ||
da6d8c04 DJ |
2683 | void |
2684 | initialize_low (void) | |
2685 | { | |
bd99dc85 PA |
2686 | struct sigaction sigchld_action; |
2687 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
24a09b5f | 2688 | thread_db_active = 0; |
ce3a066d | 2689 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
2690 | set_breakpoint_data (the_low_target.breakpoint, |
2691 | the_low_target.breakpoint_len); | |
0d62e5e8 | 2692 | linux_init_signals (); |
24a09b5f | 2693 | linux_test_for_tracefork (); |
52fa2412 UW |
2694 | #ifdef HAVE_LINUX_REGSETS |
2695 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
2696 | ; | |
bca929d3 | 2697 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 2698 | #endif |
bd99dc85 PA |
2699 | |
2700 | sigchld_action.sa_handler = sigchld_handler; | |
2701 | sigemptyset (&sigchld_action.sa_mask); | |
2702 | sigchld_action.sa_flags = SA_RESTART; | |
2703 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 2704 | } |