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) |
95954743 PA |
93 | the same as the LWP ID. |
94 | ||
95 | ``all_processes'' is keyed by the "overall process ID", which | |
96 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 97 | |
54a0b537 | 98 | struct inferior_list all_lwps; |
0d62e5e8 | 99 | |
24a09b5f DJ |
100 | /* A list of all unknown processes which receive stop signals. Some other |
101 | process will presumably claim each of these as forked children | |
102 | momentarily. */ | |
103 | ||
104 | struct inferior_list stopped_pids; | |
105 | ||
0d62e5e8 DJ |
106 | /* FIXME this is a bit of a hack, and could be removed. */ |
107 | int stopping_threads; | |
108 | ||
109 | /* FIXME make into a target method? */ | |
24a09b5f | 110 | int using_threads = 1; |
24a09b5f DJ |
111 | |
112 | static int must_set_ptrace_flags; | |
0d62e5e8 | 113 | |
95954743 PA |
114 | /* This flag is true iff we've just created or attached to our first |
115 | inferior but it has not stopped yet. As soon as it does, we need | |
116 | to call the low target's arch_setup callback. Doing this only on | |
117 | the first inferior avoids reinializing the architecture on every | |
118 | inferior, and avoids messing with the register caches of the | |
119 | already running inferiors. NOTE: this assumes all inferiors under | |
120 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
121 | static int new_inferior; |
122 | ||
54a0b537 PA |
123 | static void linux_resume_one_lwp (struct inferior_list_entry *entry, |
124 | int step, int signal, siginfo_t *info); | |
2bd7c093 | 125 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
54a0b537 | 126 | static void stop_all_lwps (void); |
95954743 | 127 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
54a0b537 | 128 | static int check_removed_breakpoint (struct lwp_info *event_child); |
95954743 | 129 | static void *add_lwp (ptid_t ptid); |
97438e3f | 130 | static int my_waitpid (int pid, int *status, int flags); |
c35fafde | 131 | static int linux_stopped_by_watchpoint (void); |
95954743 | 132 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
0d62e5e8 DJ |
133 | |
134 | struct pending_signals | |
135 | { | |
136 | int signal; | |
32ca6d61 | 137 | siginfo_t info; |
0d62e5e8 DJ |
138 | struct pending_signals *prev; |
139 | }; | |
611cb4a5 | 140 | |
d844cde6 | 141 | #define PTRACE_ARG3_TYPE long |
c6ecbae5 | 142 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 143 | |
58caa3dc | 144 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
145 | static char *disabled_regsets; |
146 | static int num_regsets; | |
58caa3dc DJ |
147 | #endif |
148 | ||
bd99dc85 PA |
149 | /* The read/write ends of the pipe registered as waitable file in the |
150 | event loop. */ | |
151 | static int linux_event_pipe[2] = { -1, -1 }; | |
152 | ||
153 | /* True if we're currently in async mode. */ | |
154 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
155 | ||
156 | static void send_sigstop (struct inferior_list_entry *entry); | |
157 | static void wait_for_sigstop (struct inferior_list_entry *entry); | |
158 | ||
159 | static void | |
160 | delete_lwp (struct lwp_info *lwp) | |
161 | { | |
162 | remove_thread (get_lwp_thread (lwp)); | |
163 | remove_inferior (&all_lwps, &lwp->head); | |
164 | free (lwp); | |
165 | } | |
166 | ||
95954743 PA |
167 | /* Add a process to the common process list, and set its private |
168 | data. */ | |
169 | ||
170 | static struct process_info * | |
171 | linux_add_process (int pid, int attached) | |
172 | { | |
173 | struct process_info *proc; | |
174 | ||
175 | /* Is this the first process? If so, then set the arch. */ | |
176 | if (all_processes.head == NULL) | |
177 | new_inferior = 1; | |
178 | ||
179 | proc = add_process (pid, attached); | |
180 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
181 | ||
182 | return proc; | |
183 | } | |
184 | ||
bd99dc85 PA |
185 | /* Handle a GNU/Linux extended wait response. If we see a clone |
186 | event, we need to add the new LWP to our list (and not report the | |
187 | trap to higher layers). */ | |
0d62e5e8 | 188 | |
24a09b5f | 189 | static void |
54a0b537 | 190 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
191 | { |
192 | int event = wstat >> 16; | |
54a0b537 | 193 | struct lwp_info *new_lwp; |
24a09b5f DJ |
194 | |
195 | if (event == PTRACE_EVENT_CLONE) | |
196 | { | |
95954743 | 197 | ptid_t ptid; |
24a09b5f | 198 | unsigned long new_pid; |
836acd6d | 199 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 200 | |
bd99dc85 | 201 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
202 | |
203 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
204 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
205 | { | |
206 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
207 | hits the SIGSTOP, but we're already attached. */ | |
208 | ||
97438e3f | 209 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
210 | |
211 | if (ret == -1) | |
212 | perror_with_name ("waiting for new child"); | |
213 | else if (ret != new_pid) | |
214 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 215 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
216 | warning ("wait returned unexpected status 0x%x", status); |
217 | } | |
218 | ||
219 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE); | |
220 | ||
95954743 PA |
221 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
222 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
223 | add_thread (ptid, new_lwp); | |
24a09b5f | 224 | |
da5898ce DJ |
225 | /* Normally we will get the pending SIGSTOP. But in some cases |
226 | we might get another signal delivered to the group first. | |
f21cc1a2 | 227 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
228 | if (WSTOPSIG (status) == SIGSTOP) |
229 | { | |
230 | if (stopping_threads) | |
54a0b537 | 231 | new_lwp->stopped = 1; |
da5898ce DJ |
232 | else |
233 | ptrace (PTRACE_CONT, new_pid, 0, 0); | |
234 | } | |
24a09b5f | 235 | else |
da5898ce | 236 | { |
54a0b537 | 237 | new_lwp->stop_expected = 1; |
da5898ce DJ |
238 | if (stopping_threads) |
239 | { | |
54a0b537 PA |
240 | new_lwp->stopped = 1; |
241 | new_lwp->status_pending_p = 1; | |
242 | new_lwp->status_pending = status; | |
da5898ce DJ |
243 | } |
244 | else | |
245 | /* Pass the signal on. This is what GDB does - except | |
246 | shouldn't we really report it instead? */ | |
247 | ptrace (PTRACE_CONT, new_pid, 0, WSTOPSIG (status)); | |
248 | } | |
24a09b5f DJ |
249 | |
250 | /* Always resume the current thread. If we are stopping | |
251 | threads, it will have a pending SIGSTOP; we may as well | |
252 | collect it now. */ | |
54a0b537 PA |
253 | linux_resume_one_lwp (&event_child->head, |
254 | event_child->stepping, 0, NULL); | |
24a09b5f DJ |
255 | } |
256 | } | |
257 | ||
0d62e5e8 DJ |
258 | /* This function should only be called if the process got a SIGTRAP. |
259 | The SIGTRAP could mean several things. | |
260 | ||
261 | On i386, where decr_pc_after_break is non-zero: | |
262 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
263 | we will get only the one SIGTRAP (even if the instruction we | |
264 | stepped over was a breakpoint). The value of $eip will be the | |
265 | next instruction. | |
266 | If we continue the process using PTRACE_CONT, we will get a | |
267 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
268 | the instruction after the breakpoint (i.e. needs to be | |
269 | decremented). If we report the SIGTRAP to GDB, we must also | |
270 | report the undecremented PC. If we cancel the SIGTRAP, we | |
271 | must resume at the decremented PC. | |
272 | ||
273 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
274 | with hardware or kernel single-step: | |
275 | If we single-step over a breakpoint instruction, our PC will | |
276 | point at the following instruction. If we continue and hit a | |
277 | breakpoint instruction, our PC will point at the breakpoint | |
278 | instruction. */ | |
279 | ||
280 | static CORE_ADDR | |
281 | get_stop_pc (void) | |
282 | { | |
283 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
284 | ||
54a0b537 | 285 | if (get_thread_lwp (current_inferior)->stepping) |
0d62e5e8 DJ |
286 | return stop_pc; |
287 | else | |
288 | return stop_pc - the_low_target.decr_pc_after_break; | |
289 | } | |
ce3a066d | 290 | |
0d62e5e8 | 291 | static void * |
95954743 | 292 | add_lwp (ptid_t ptid) |
611cb4a5 | 293 | { |
54a0b537 | 294 | struct lwp_info *lwp; |
0d62e5e8 | 295 | |
54a0b537 PA |
296 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
297 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 298 | |
95954743 | 299 | lwp->head.id = ptid; |
0d62e5e8 | 300 | |
54a0b537 | 301 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 302 | |
54a0b537 | 303 | return lwp; |
0d62e5e8 | 304 | } |
611cb4a5 | 305 | |
da6d8c04 DJ |
306 | /* Start an inferior process and returns its pid. |
307 | ALLARGS is a vector of program-name and args. */ | |
308 | ||
ce3a066d DJ |
309 | static int |
310 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 311 | { |
54a0b537 | 312 | void *new_lwp; |
da6d8c04 | 313 | int pid; |
95954743 | 314 | ptid_t ptid; |
da6d8c04 | 315 | |
42c81e2a | 316 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
317 | pid = vfork (); |
318 | #else | |
da6d8c04 | 319 | pid = fork (); |
52fb6437 | 320 | #endif |
da6d8c04 DJ |
321 | if (pid < 0) |
322 | perror_with_name ("fork"); | |
323 | ||
324 | if (pid == 0) | |
325 | { | |
326 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
327 | ||
254787d4 | 328 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 329 | |
a9fa9f7d DJ |
330 | setpgid (0, 0); |
331 | ||
2b876972 DJ |
332 | execv (program, allargs); |
333 | if (errno == ENOENT) | |
334 | execvp (program, allargs); | |
da6d8c04 DJ |
335 | |
336 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 337 | strerror (errno)); |
da6d8c04 DJ |
338 | fflush (stderr); |
339 | _exit (0177); | |
340 | } | |
341 | ||
95954743 PA |
342 | linux_add_process (pid, 0); |
343 | ||
344 | ptid = ptid_build (pid, pid, 0); | |
345 | new_lwp = add_lwp (ptid); | |
346 | add_thread (ptid, new_lwp); | |
24a09b5f | 347 | must_set_ptrace_flags = 1; |
611cb4a5 | 348 | |
a9fa9f7d | 349 | return pid; |
da6d8c04 DJ |
350 | } |
351 | ||
352 | /* Attach to an inferior process. */ | |
353 | ||
95954743 PA |
354 | static void |
355 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 356 | { |
95954743 | 357 | ptid_t ptid; |
54a0b537 | 358 | struct lwp_info *new_lwp; |
611cb4a5 | 359 | |
95954743 | 360 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 361 | { |
95954743 | 362 | if (!initial) |
2d717e4f DJ |
363 | { |
364 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 365 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
366 | strerror (errno), errno); |
367 | fflush (stderr); | |
368 | return; | |
369 | } | |
370 | else | |
371 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 372 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 373 | strerror (errno), errno); |
da6d8c04 DJ |
374 | } |
375 | ||
0e21c1ec DE |
376 | /* FIXME: This intermittently fails. |
377 | We need to wait for SIGSTOP first. */ | |
95954743 PA |
378 | ptrace (PTRACE_SETOPTIONS, lwpid, 0, PTRACE_O_TRACECLONE); |
379 | ||
380 | if (initial) | |
381 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
382 | ptid = ptid_build (lwpid, lwpid, 0); | |
383 | else | |
384 | { | |
385 | /* Note that extracting the pid from the current inferior is | |
386 | safe, since we're always called in the context of the same | |
387 | process as this new thread. */ | |
388 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
389 | ptid = ptid_build (pid, lwpid, 0); | |
390 | } | |
24a09b5f | 391 | |
95954743 PA |
392 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
393 | add_thread (ptid, new_lwp); | |
0d62e5e8 DJ |
394 | |
395 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH | |
0e21c1ec DE |
396 | brings it to a halt. |
397 | ||
398 | There are several cases to consider here: | |
399 | ||
400 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 PA |
401 | of a new thread that is being created. |
402 | In this case we should ignore that SIGSTOP and resume the process. | |
403 | This is handled below by setting stop_expected = 1. | |
0e21c1ec DE |
404 | |
405 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
406 | to it via attach_inferior. |
407 | In this case we want the process thread to stop. | |
408 | This is handled by having linux_attach clear stop_expected after | |
409 | we return. | |
410 | ??? If the process already has several threads we leave the other | |
411 | threads running. | |
0e21c1ec DE |
412 | |
413 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
414 | existing threads. |
415 | In this case we want the thread to stop. | |
416 | FIXME: This case is currently not properly handled. | |
417 | We should wait for the SIGSTOP but don't. Things work apparently | |
418 | because enough time passes between when we ptrace (ATTACH) and when | |
419 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
420 | |
421 | On the other hand, if we are currently trying to stop all threads, we | |
422 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 423 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
424 | end of the list, and so the new thread has not yet reached |
425 | wait_for_sigstop (but will). */ | |
0d62e5e8 | 426 | if (! stopping_threads) |
54a0b537 | 427 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
428 | } |
429 | ||
95954743 PA |
430 | void |
431 | linux_attach_lwp (unsigned long lwpid) | |
432 | { | |
433 | linux_attach_lwp_1 (lwpid, 0); | |
434 | } | |
435 | ||
0d62e5e8 | 436 | int |
a1928bad | 437 | linux_attach (unsigned long pid) |
0d62e5e8 | 438 | { |
54a0b537 | 439 | struct lwp_info *lwp; |
0d62e5e8 | 440 | |
95954743 PA |
441 | linux_attach_lwp_1 (pid, 1); |
442 | ||
443 | linux_add_process (pid, 1); | |
0d62e5e8 | 444 | |
bd99dc85 PA |
445 | if (!non_stop) |
446 | { | |
447 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
448 | process. It will be collected by wait shortly. */ | |
95954743 PA |
449 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
450 | ptid_build (pid, pid, 0)); | |
bd99dc85 PA |
451 | lwp->stop_expected = 0; |
452 | } | |
0d62e5e8 | 453 | |
95954743 PA |
454 | return 0; |
455 | } | |
456 | ||
457 | struct counter | |
458 | { | |
459 | int pid; | |
460 | int count; | |
461 | }; | |
462 | ||
463 | static int | |
464 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
465 | { | |
466 | struct counter *counter = args; | |
467 | ||
468 | if (ptid_get_pid (entry->id) == counter->pid) | |
469 | { | |
470 | if (++counter->count > 1) | |
471 | return 1; | |
472 | } | |
d61ddec4 | 473 | |
da6d8c04 DJ |
474 | return 0; |
475 | } | |
476 | ||
95954743 PA |
477 | static int |
478 | last_thread_of_process_p (struct thread_info *thread) | |
479 | { | |
480 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
481 | int pid = ptid_get_pid (ptid); | |
482 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 483 | |
95954743 PA |
484 | return (find_inferior (&all_threads, |
485 | second_thread_of_pid_p, &counter) == NULL); | |
486 | } | |
487 | ||
488 | /* Kill the inferior lwp. */ | |
489 | ||
490 | static int | |
491 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 492 | { |
0d62e5e8 | 493 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 494 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 495 | int wstat; |
95954743 PA |
496 | int pid = * (int *) args; |
497 | ||
498 | if (ptid_get_pid (entry->id) != pid) | |
499 | return 0; | |
0d62e5e8 | 500 | |
fd500816 DJ |
501 | /* We avoid killing the first thread here, because of a Linux kernel (at |
502 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
503 | the children get a chance to be reaped, it will remain a zombie | |
504 | forever. */ | |
95954743 PA |
505 | |
506 | if (last_thread_of_process_p (thread)) | |
507 | { | |
508 | if (debug_threads) | |
509 | fprintf (stderr, "lkop: is last of process %s\n", | |
510 | target_pid_to_str (entry->id)); | |
511 | return 0; | |
512 | } | |
fd500816 | 513 | |
bd99dc85 PA |
514 | /* If we're killing a running inferior, make sure it is stopped |
515 | first, as PTRACE_KILL will not work otherwise. */ | |
516 | if (!lwp->stopped) | |
517 | send_sigstop (&lwp->head); | |
518 | ||
0d62e5e8 DJ |
519 | do |
520 | { | |
bd99dc85 | 521 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
522 | |
523 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 524 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 525 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
526 | |
527 | return 0; | |
da6d8c04 DJ |
528 | } |
529 | ||
95954743 PA |
530 | static int |
531 | linux_kill (int pid) | |
0d62e5e8 | 532 | { |
95954743 | 533 | struct process_info *process; |
54a0b537 | 534 | struct lwp_info *lwp; |
95954743 | 535 | struct thread_info *thread; |
fd500816 | 536 | int wstat; |
95954743 | 537 | int lwpid; |
fd500816 | 538 | |
95954743 PA |
539 | process = find_process_pid (pid); |
540 | if (process == NULL) | |
541 | return -1; | |
9d606399 | 542 | |
95954743 | 543 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 544 | |
54a0b537 | 545 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 546 | thread in the list, so do so now. */ |
95954743 PA |
547 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
548 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
549 | |
550 | if (debug_threads) | |
95954743 PA |
551 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
552 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
553 | |
554 | /* If we're killing a running inferior, make sure it is stopped | |
555 | first, as PTRACE_KILL will not work otherwise. */ | |
556 | if (!lwp->stopped) | |
557 | send_sigstop (&lwp->head); | |
558 | ||
fd500816 DJ |
559 | do |
560 | { | |
bd99dc85 | 561 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
562 | |
563 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
564 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
565 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 566 | |
bd99dc85 | 567 | delete_lwp (lwp); |
95954743 PA |
568 | remove_process (process); |
569 | return 0; | |
0d62e5e8 DJ |
570 | } |
571 | ||
95954743 PA |
572 | static int |
573 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
574 | { |
575 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 576 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
577 | int pid = * (int *) args; |
578 | ||
579 | if (ptid_get_pid (entry->id) != pid) | |
580 | return 0; | |
6ad8ae5c | 581 | |
bd99dc85 PA |
582 | /* If we're detaching from a running inferior, make sure it is |
583 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
584 | if (!lwp->stopped) | |
585 | { | |
95954743 | 586 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
587 | |
588 | stopping_threads = 1; | |
589 | send_sigstop (&lwp->head); | |
590 | ||
591 | /* If this detects a new thread through a clone event, the new | |
592 | thread is appended to the end of the lwp list, so we'll | |
593 | eventually detach from it. */ | |
594 | wait_for_sigstop (&lwp->head); | |
595 | stopping_threads = 0; | |
596 | ||
597 | /* If LWP exits while we're trying to stop it, there's nothing | |
598 | left to do. */ | |
95954743 | 599 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 600 | if (lwp == NULL) |
95954743 | 601 | return 0; |
bd99dc85 PA |
602 | } |
603 | ||
ae13219e DJ |
604 | /* Make sure the process isn't stopped at a breakpoint that's |
605 | no longer there. */ | |
54a0b537 | 606 | check_removed_breakpoint (lwp); |
ae13219e DJ |
607 | |
608 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
609 | sure we take care of that now. This isn't absolutely guaranteed | |
610 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 611 | if (lwp->stop_expected) |
ae13219e | 612 | { |
bd99dc85 | 613 | int wstat; |
ae13219e | 614 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
615 | lwp->stop_expected = 0; |
616 | if (lwp->stopped) | |
617 | linux_resume_one_lwp (&lwp->head, 0, 0, NULL); | |
95954743 | 618 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
619 | } |
620 | ||
621 | /* Flush any pending changes to the process's registers. */ | |
622 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 623 | get_lwp_thread (lwp)); |
ae13219e DJ |
624 | |
625 | /* Finally, let it resume. */ | |
bd99dc85 PA |
626 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
627 | ||
628 | delete_lwp (lwp); | |
95954743 | 629 | return 0; |
6ad8ae5c DJ |
630 | } |
631 | ||
dd6953e1 | 632 | static int |
95954743 | 633 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 634 | { |
95954743 PA |
635 | int *pid_p = args; |
636 | ||
637 | if (ptid_get_pid (entry->id) == *pid_p) | |
638 | return 1; | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | static int | |
644 | linux_detach (int pid) | |
645 | { | |
646 | struct process_info *process; | |
647 | ||
648 | process = find_process_pid (pid); | |
649 | if (process == NULL) | |
650 | return -1; | |
651 | ||
652 | current_inferior = | |
653 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
654 | ||
ae13219e | 655 | delete_all_breakpoints (); |
95954743 PA |
656 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
657 | remove_process (process); | |
dd6953e1 | 658 | return 0; |
6ad8ae5c DJ |
659 | } |
660 | ||
444d6139 | 661 | static void |
95954743 | 662 | linux_join (int pid) |
444d6139 | 663 | { |
444d6139 | 664 | int status, ret; |
95954743 | 665 | struct process_info *process; |
bd99dc85 | 666 | |
95954743 PA |
667 | process = find_process_pid (pid); |
668 | if (process == NULL) | |
669 | return; | |
444d6139 PA |
670 | |
671 | do { | |
95954743 | 672 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
673 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
674 | break; | |
675 | } while (ret != -1 || errno != ECHILD); | |
676 | } | |
677 | ||
6ad8ae5c | 678 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 679 | static int |
95954743 | 680 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 681 | { |
95954743 PA |
682 | struct lwp_info *lwp = find_lwp_pid (ptid); |
683 | ||
684 | /* We assume we always know if a thread exits. If a whole process | |
685 | exited but we still haven't been able to report it to GDB, we'll | |
686 | hold on to the last lwp of the dead process. */ | |
687 | if (lwp != NULL) | |
688 | return !lwp->dead; | |
0d62e5e8 DJ |
689 | else |
690 | return 0; | |
691 | } | |
692 | ||
693 | /* Return nonzero if this process stopped at a breakpoint which | |
694 | no longer appears to be inserted. Also adjust the PC | |
695 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 696 | static int |
54a0b537 | 697 | check_removed_breakpoint (struct lwp_info *event_child) |
da6d8c04 | 698 | { |
0d62e5e8 DJ |
699 | CORE_ADDR stop_pc; |
700 | struct thread_info *saved_inferior; | |
701 | ||
702 | if (event_child->pending_is_breakpoint == 0) | |
703 | return 0; | |
704 | ||
705 | if (debug_threads) | |
54a0b537 | 706 | fprintf (stderr, "Checking for breakpoint in lwp %ld.\n", |
bd99dc85 | 707 | lwpid_of (event_child)); |
0d62e5e8 DJ |
708 | |
709 | saved_inferior = current_inferior; | |
54a0b537 | 710 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 DJ |
711 | |
712 | stop_pc = get_stop_pc (); | |
713 | ||
714 | /* If the PC has changed since we stopped, then we shouldn't do | |
715 | anything. This happens if, for instance, GDB handled the | |
716 | decr_pc_after_break subtraction itself. */ | |
717 | if (stop_pc != event_child->pending_stop_pc) | |
718 | { | |
719 | if (debug_threads) | |
ae13219e DJ |
720 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
721 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
722 | |
723 | event_child->pending_is_breakpoint = 0; | |
724 | current_inferior = saved_inferior; | |
725 | return 0; | |
726 | } | |
727 | ||
728 | /* If the breakpoint is still there, we will report hitting it. */ | |
729 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
730 | { | |
731 | if (debug_threads) | |
732 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
733 | current_inferior = saved_inferior; | |
734 | return 0; | |
735 | } | |
736 | ||
737 | if (debug_threads) | |
738 | fprintf (stderr, "Removed breakpoint.\n"); | |
739 | ||
740 | /* For decr_pc_after_break targets, here is where we perform the | |
741 | decrement. We go immediately from this function to resuming, | |
742 | and can not safely call get_stop_pc () again. */ | |
743 | if (the_low_target.set_pc != NULL) | |
744 | (*the_low_target.set_pc) (stop_pc); | |
745 | ||
746 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 747 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
748 | event_child->status_pending_p = 0; |
749 | event_child->status_pending = 0; | |
750 | ||
751 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
752 | return 1; |
753 | } | |
754 | ||
54a0b537 PA |
755 | /* Return 1 if this lwp has an interesting status pending. This |
756 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 757 | static int |
95954743 | 758 | status_pending_p (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 759 | { |
54a0b537 | 760 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 PA |
761 | ptid_t ptid = * (ptid_t *) arg; |
762 | ||
763 | /* Check if we're only interested in events from a specific process | |
764 | or its lwps. */ | |
765 | if (!ptid_equal (minus_one_ptid, ptid) | |
766 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
767 | return 0; | |
0d62e5e8 | 768 | |
bd99dc85 | 769 | if (lwp->status_pending_p && !lwp->suspended) |
54a0b537 | 770 | if (check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
771 | { |
772 | /* This thread was stopped at a breakpoint, and the breakpoint | |
773 | is now gone. We were told to continue (or step...) all threads, | |
774 | so GDB isn't trying to single-step past this breakpoint. | |
775 | So instead of reporting the old SIGTRAP, pretend we got to | |
776 | the breakpoint just after it was removed instead of just | |
777 | before; resume the process. */ | |
54a0b537 | 778 | linux_resume_one_lwp (&lwp->head, 0, 0, NULL); |
0d62e5e8 DJ |
779 | return 0; |
780 | } | |
781 | ||
bd99dc85 | 782 | return (lwp->status_pending_p && !lwp->suspended); |
0d62e5e8 DJ |
783 | } |
784 | ||
95954743 PA |
785 | static int |
786 | same_lwp (struct inferior_list_entry *entry, void *data) | |
787 | { | |
788 | ptid_t ptid = *(ptid_t *) data; | |
789 | int lwp; | |
790 | ||
791 | if (ptid_get_lwp (ptid) != 0) | |
792 | lwp = ptid_get_lwp (ptid); | |
793 | else | |
794 | lwp = ptid_get_pid (ptid); | |
795 | ||
796 | if (ptid_get_lwp (entry->id) == lwp) | |
797 | return 1; | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
802 | struct lwp_info * | |
803 | find_lwp_pid (ptid_t ptid) | |
804 | { | |
805 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
806 | } | |
807 | ||
bd99dc85 | 808 | static struct lwp_info * |
95954743 | 809 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 810 | { |
0d62e5e8 | 811 | int ret; |
95954743 | 812 | int to_wait_for = -1; |
bd99dc85 | 813 | struct lwp_info *child = NULL; |
0d62e5e8 | 814 | |
bd99dc85 | 815 | if (debug_threads) |
95954743 PA |
816 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
817 | ||
818 | if (ptid_equal (ptid, minus_one_ptid)) | |
819 | to_wait_for = -1; /* any child */ | |
820 | else | |
821 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 822 | |
bd99dc85 | 823 | options |= __WALL; |
0d62e5e8 | 824 | |
bd99dc85 | 825 | retry: |
0d62e5e8 | 826 | |
bd99dc85 PA |
827 | ret = my_waitpid (to_wait_for, wstatp, options); |
828 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
829 | return NULL; | |
830 | else if (ret == -1) | |
831 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
832 | |
833 | if (debug_threads | |
834 | && (!WIFSTOPPED (*wstatp) | |
835 | || (WSTOPSIG (*wstatp) != 32 | |
836 | && WSTOPSIG (*wstatp) != 33))) | |
837 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
838 | ||
95954743 | 839 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 840 | |
24a09b5f DJ |
841 | /* If we didn't find a process, one of two things presumably happened: |
842 | - A process we started and then detached from has exited. Ignore it. | |
843 | - A process we are controlling has forked and the new child's stop | |
844 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 845 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
846 | { |
847 | add_pid_to_list (&stopped_pids, ret); | |
848 | goto retry; | |
849 | } | |
bd99dc85 | 850 | else if (child == NULL) |
24a09b5f DJ |
851 | goto retry; |
852 | ||
bd99dc85 PA |
853 | child->stopped = 1; |
854 | child->pending_is_breakpoint = 0; | |
0d62e5e8 | 855 | |
bd99dc85 | 856 | child->last_status = *wstatp; |
32ca6d61 | 857 | |
d61ddec4 UW |
858 | /* Architecture-specific setup after inferior is running. |
859 | This needs to happen after we have attached to the inferior | |
860 | and it is stopped for the first time, but before we access | |
861 | any inferior registers. */ | |
862 | if (new_inferior) | |
863 | { | |
864 | the_low_target.arch_setup (); | |
52fa2412 UW |
865 | #ifdef HAVE_LINUX_REGSETS |
866 | memset (disabled_regsets, 0, num_regsets); | |
867 | #endif | |
d61ddec4 UW |
868 | new_inferior = 0; |
869 | } | |
870 | ||
0d62e5e8 DJ |
871 | if (debug_threads |
872 | && WIFSTOPPED (*wstatp)) | |
873 | { | |
896c7fbb | 874 | struct thread_info *saved_inferior = current_inferior; |
0d62e5e8 | 875 | current_inferior = (struct thread_info *) |
95954743 | 876 | find_inferior_id (&all_threads, child->head.id); |
0d62e5e8 DJ |
877 | /* For testing only; i386_stop_pc prints out a diagnostic. */ |
878 | if (the_low_target.get_pc != NULL) | |
879 | get_stop_pc (); | |
896c7fbb | 880 | current_inferior = saved_inferior; |
0d62e5e8 | 881 | } |
bd99dc85 PA |
882 | |
883 | return child; | |
0d62e5e8 | 884 | } |
611cb4a5 | 885 | |
bd99dc85 PA |
886 | /* Wait for an event from child PID. If PID is -1, wait for any |
887 | child. Store the stop status through the status pointer WSTAT. | |
888 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
889 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
890 | the stopped child otherwise. */ | |
891 | ||
0d62e5e8 | 892 | static int |
95954743 | 893 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 DJ |
894 | { |
895 | CORE_ADDR stop_pc; | |
bd99dc85 | 896 | struct lwp_info *event_child = NULL; |
b65d95c5 | 897 | int bp_status; |
bd99dc85 | 898 | struct lwp_info *requested_child = NULL; |
0d62e5e8 | 899 | |
95954743 | 900 | /* Check for a lwp with a pending status. */ |
0d62e5e8 DJ |
901 | /* It is possible that the user changed the pending task's registers since |
902 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 903 | (in check_removed_breakpoint); signals should be reported anyway. */ |
bd99dc85 | 904 | |
95954743 PA |
905 | if (ptid_equal (ptid, minus_one_ptid) |
906 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 907 | { |
54a0b537 | 908 | event_child = (struct lwp_info *) |
95954743 | 909 | find_inferior (&all_lwps, status_pending_p, &ptid); |
0d62e5e8 | 910 | if (debug_threads && event_child) |
bd99dc85 | 911 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
912 | } |
913 | else | |
914 | { | |
95954743 | 915 | requested_child = find_lwp_pid (ptid); |
bd99dc85 PA |
916 | if (requested_child->status_pending_p |
917 | && !check_removed_breakpoint (requested_child)) | |
918 | event_child = requested_child; | |
0d62e5e8 | 919 | } |
611cb4a5 | 920 | |
0d62e5e8 DJ |
921 | if (event_child != NULL) |
922 | { | |
bd99dc85 PA |
923 | if (debug_threads) |
924 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
925 | lwpid_of (event_child), event_child->status_pending); | |
926 | *wstat = event_child->status_pending; | |
927 | event_child->status_pending_p = 0; | |
928 | event_child->status_pending = 0; | |
929 | current_inferior = get_lwp_thread (event_child); | |
930 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
931 | } |
932 | ||
933 | /* We only enter this loop if no process has a pending wait status. Thus | |
934 | any action taken in response to a wait status inside this loop is | |
935 | responding as soon as we detect the status, not after any pending | |
936 | events. */ | |
937 | while (1) | |
938 | { | |
95954743 | 939 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 940 | |
bd99dc85 PA |
941 | if ((options & WNOHANG) && event_child == NULL) |
942 | return 0; | |
0d62e5e8 DJ |
943 | |
944 | if (event_child == NULL) | |
945 | error ("event from unknown child"); | |
611cb4a5 | 946 | |
bd99dc85 | 947 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 948 | |
89be2091 | 949 | /* Check for thread exit. */ |
bd99dc85 | 950 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 951 | { |
89be2091 | 952 | if (debug_threads) |
95954743 | 953 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
954 | |
955 | /* If the last thread is exiting, just return. */ | |
95954743 | 956 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
957 | { |
958 | if (debug_threads) | |
95954743 PA |
959 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
960 | lwpid_of (event_child)); | |
bd99dc85 PA |
961 | return lwpid_of (event_child); |
962 | } | |
89be2091 | 963 | |
bd99dc85 | 964 | delete_lwp (event_child); |
89be2091 | 965 | |
bd99dc85 PA |
966 | if (!non_stop) |
967 | { | |
968 | current_inferior = (struct thread_info *) all_threads.head; | |
969 | if (debug_threads) | |
970 | fprintf (stderr, "Current inferior is now %ld\n", | |
971 | lwpid_of (get_thread_lwp (current_inferior))); | |
972 | } | |
973 | else | |
974 | { | |
975 | current_inferior = NULL; | |
976 | if (debug_threads) | |
977 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
978 | } | |
89be2091 DJ |
979 | |
980 | /* If we were waiting for this particular child to do something... | |
981 | well, it did something. */ | |
bd99dc85 | 982 | if (requested_child != NULL) |
95954743 | 983 | return lwpid_of (event_child); |
89be2091 DJ |
984 | |
985 | /* Wait for a more interesting event. */ | |
986 | continue; | |
987 | } | |
988 | ||
bd99dc85 PA |
989 | if (WIFSTOPPED (*wstat) |
990 | && WSTOPSIG (*wstat) == SIGSTOP | |
89be2091 DJ |
991 | && event_child->stop_expected) |
992 | { | |
993 | if (debug_threads) | |
994 | fprintf (stderr, "Expected stop.\n"); | |
995 | event_child->stop_expected = 0; | |
54a0b537 PA |
996 | linux_resume_one_lwp (&event_child->head, |
997 | event_child->stepping, 0, NULL); | |
89be2091 DJ |
998 | continue; |
999 | } | |
1000 | ||
bd99dc85 PA |
1001 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1002 | && *wstat >> 16 != 0) | |
24a09b5f | 1003 | { |
bd99dc85 | 1004 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1005 | continue; |
1006 | } | |
1007 | ||
89be2091 DJ |
1008 | /* If GDB is not interested in this signal, don't stop other |
1009 | threads, and don't report it to GDB. Just resume the | |
1010 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1011 | signals as well as any that GDB specifically requested we |
1012 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1013 | and do not ignore signals when stepping - they may require | |
1014 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1015 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1016 | thread library? */ | |
bd99dc85 | 1017 | if (WIFSTOPPED (*wstat) |
69f223ed | 1018 | && !event_child->stepping |
24a09b5f DJ |
1019 | && ( |
1020 | #ifdef USE_THREAD_DB | |
95954743 | 1021 | (current_process ()->private->thread_db_active |
bd99dc85 PA |
1022 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1023 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1024 | || |
1025 | #endif | |
bd99dc85 PA |
1026 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
1027 | && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
1028 | { |
1029 | siginfo_t info, *info_p; | |
1030 | ||
1031 | if (debug_threads) | |
24a09b5f | 1032 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1033 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1034 | |
bd99dc85 | 1035 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1036 | info_p = &info; |
1037 | else | |
1038 | info_p = NULL; | |
54a0b537 PA |
1039 | linux_resume_one_lwp (&event_child->head, |
1040 | event_child->stepping, | |
bd99dc85 | 1041 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1042 | continue; |
0d62e5e8 | 1043 | } |
611cb4a5 | 1044 | |
0d62e5e8 DJ |
1045 | /* If this event was not handled above, and is not a SIGTRAP, report |
1046 | it. */ | |
bd99dc85 PA |
1047 | if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP) |
1048 | return lwpid_of (event_child); | |
611cb4a5 | 1049 | |
0d62e5e8 DJ |
1050 | /* If this target does not support breakpoints, we simply report the |
1051 | SIGTRAP; it's of no concern to us. */ | |
1052 | if (the_low_target.get_pc == NULL) | |
bd99dc85 | 1053 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1054 | |
1055 | stop_pc = get_stop_pc (); | |
1056 | ||
1057 | /* bp_reinsert will only be set if we were single-stepping. | |
1058 | Notice that we will resume the process after hitting | |
1059 | a gdbserver breakpoint; single-stepping to/over one | |
1060 | is not supported (yet). */ | |
1061 | if (event_child->bp_reinsert != 0) | |
1062 | { | |
1063 | if (debug_threads) | |
1064 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
1065 | reinsert_breakpoint (event_child->bp_reinsert); | |
1066 | event_child->bp_reinsert = 0; | |
1067 | ||
1068 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
54a0b537 | 1069 | linux_resume_one_lwp (&event_child->head, 0, 0, NULL); |
0d62e5e8 DJ |
1070 | continue; |
1071 | } | |
1072 | ||
b65d95c5 | 1073 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 1074 | |
b65d95c5 | 1075 | if (bp_status != 0) |
0d62e5e8 | 1076 | { |
b65d95c5 DJ |
1077 | if (debug_threads) |
1078 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1079 | ||
0d62e5e8 | 1080 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 1081 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
1082 | adjustment for us at the appropriate time. */ |
1083 | event_child->pending_is_breakpoint = 1; | |
1084 | event_child->pending_stop_pc = stop_pc; | |
1085 | ||
b65d95c5 | 1086 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
1087 | loop instead of simply replacing the breakpoint right away, |
1088 | in order to not lose signals sent to the thread that hit the | |
1089 | breakpoint. Unfortunately this increases the window where another | |
1090 | thread could sneak past the removed breakpoint. For the current | |
1091 | use of server-side breakpoints (thread creation) this is | |
1092 | acceptable; but it needs to be considered before this breakpoint | |
1093 | mechanism can be used in more general ways. For some breakpoints | |
1094 | it may be necessary to stop all other threads, but that should | |
1095 | be avoided where possible. | |
1096 | ||
1097 | If breakpoint_reinsert_addr is NULL, that means that we can | |
1098 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
1099 | mark it for reinsertion, and single-step. | |
1100 | ||
1101 | Otherwise, call the target function to figure out where we need | |
1102 | our temporary breakpoint, create it, and continue executing this | |
1103 | process. */ | |
bd99dc85 PA |
1104 | |
1105 | /* NOTE: we're lifting breakpoints in non-stop mode. This | |
1106 | is currently only used for thread event breakpoints, so | |
1107 | it isn't that bad as long as we have PTRACE_EVENT_CLONE | |
1108 | events. */ | |
b65d95c5 DJ |
1109 | if (bp_status == 2) |
1110 | /* No need to reinsert. */ | |
54a0b537 | 1111 | linux_resume_one_lwp (&event_child->head, 0, 0, NULL); |
b65d95c5 | 1112 | else if (the_low_target.breakpoint_reinsert_addr == NULL) |
0d62e5e8 DJ |
1113 | { |
1114 | event_child->bp_reinsert = stop_pc; | |
1115 | uninsert_breakpoint (stop_pc); | |
54a0b537 | 1116 | linux_resume_one_lwp (&event_child->head, 1, 0, NULL); |
0d62e5e8 DJ |
1117 | } |
1118 | else | |
1119 | { | |
1120 | reinsert_breakpoint_by_bp | |
1121 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
54a0b537 | 1122 | linux_resume_one_lwp (&event_child->head, 0, 0, NULL); |
611cb4a5 | 1123 | } |
0d62e5e8 DJ |
1124 | |
1125 | continue; | |
1126 | } | |
1127 | ||
b65d95c5 DJ |
1128 | if (debug_threads) |
1129 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
1130 | ||
0d62e5e8 | 1131 | /* If we were single-stepping, we definitely want to report the |
c35fafde PA |
1132 | SIGTRAP. Although the single-step operation has completed, |
1133 | do not clear clear the stepping flag yet; we need to check it | |
1134 | in wait_for_sigstop. */ | |
0d62e5e8 | 1135 | if (event_child->stepping) |
bd99dc85 | 1136 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1137 | |
1138 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
1139 | Check if it is a breakpoint, and if so mark the process information | |
1140 | accordingly. This will handle both the necessary fiddling with the | |
1141 | PC on decr_pc_after_break targets and suppressing extra threads | |
1142 | hitting a breakpoint if two hit it at once and then GDB removes it | |
1143 | after the first is reported. Arguably it would be better to report | |
1144 | multiple threads hitting breakpoints simultaneously, but the current | |
1145 | remote protocol does not allow this. */ | |
1146 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
1147 | { | |
1148 | event_child->pending_is_breakpoint = 1; | |
1149 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
1150 | } |
1151 | ||
bd99dc85 | 1152 | return lwpid_of (event_child); |
611cb4a5 | 1153 | } |
0d62e5e8 | 1154 | |
611cb4a5 DJ |
1155 | /* NOTREACHED */ |
1156 | return 0; | |
1157 | } | |
1158 | ||
95954743 PA |
1159 | static int |
1160 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1161 | { | |
1162 | ptid_t wait_ptid; | |
1163 | ||
1164 | if (ptid_is_pid (ptid)) | |
1165 | { | |
1166 | /* A request to wait for a specific tgid. This is not possible | |
1167 | with waitpid, so instead, we wait for any child, and leave | |
1168 | children we're not interested in right now with a pending | |
1169 | status to report later. */ | |
1170 | wait_ptid = minus_one_ptid; | |
1171 | } | |
1172 | else | |
1173 | wait_ptid = ptid; | |
1174 | ||
1175 | while (1) | |
1176 | { | |
1177 | int event_pid; | |
1178 | ||
1179 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1180 | ||
1181 | if (event_pid > 0 | |
1182 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1183 | { | |
1184 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1185 | ||
1186 | if (! WIFSTOPPED (*wstat)) | |
1187 | mark_lwp_dead (event_child, *wstat); | |
1188 | else | |
1189 | { | |
1190 | event_child->status_pending_p = 1; | |
1191 | event_child->status_pending = *wstat; | |
1192 | } | |
1193 | } | |
1194 | else | |
1195 | return event_pid; | |
1196 | } | |
1197 | } | |
1198 | ||
0d62e5e8 | 1199 | /* Wait for process, returns status. */ |
da6d8c04 | 1200 | |
95954743 PA |
1201 | static ptid_t |
1202 | linux_wait_1 (ptid_t ptid, | |
1203 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1204 | { |
e5f1222d | 1205 | int w; |
bd99dc85 PA |
1206 | struct thread_info *thread = NULL; |
1207 | struct lwp_info *lwp = NULL; | |
1208 | int options; | |
bd99dc85 PA |
1209 | int pid; |
1210 | ||
1211 | /* Translate generic target options into linux options. */ | |
1212 | options = __WALL; | |
1213 | if (target_options & TARGET_WNOHANG) | |
1214 | options |= WNOHANG; | |
0d62e5e8 DJ |
1215 | |
1216 | retry: | |
bd99dc85 PA |
1217 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1218 | ||
0d62e5e8 DJ |
1219 | /* If we were only supposed to resume one thread, only wait for |
1220 | that thread - if it's still alive. If it died, however - which | |
1221 | can happen if we're coming from the thread death case below - | |
1222 | then we need to make sure we restart the other threads. We could | |
1223 | pick a thread at random or restart all; restarting all is less | |
1224 | arbitrary. */ | |
95954743 PA |
1225 | if (!non_stop |
1226 | && !ptid_equal (cont_thread, null_ptid) | |
1227 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1228 | { |
bd99dc85 PA |
1229 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1230 | cont_thread); | |
0d62e5e8 DJ |
1231 | |
1232 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1233 | if (thread == NULL) |
64386c31 DJ |
1234 | { |
1235 | struct thread_resume resume_info; | |
95954743 | 1236 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1237 | resume_info.kind = resume_continue; |
1238 | resume_info.sig = 0; | |
2bd7c093 | 1239 | linux_resume (&resume_info, 1); |
64386c31 | 1240 | } |
bd99dc85 | 1241 | else |
95954743 | 1242 | ptid = cont_thread; |
0d62e5e8 | 1243 | } |
da6d8c04 | 1244 | |
95954743 | 1245 | pid = linux_wait_for_event (ptid, &w, options); |
bd99dc85 | 1246 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1247 | return null_ptid; |
bd99dc85 PA |
1248 | |
1249 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1250 | |
24a09b5f DJ |
1251 | if (must_set_ptrace_flags) |
1252 | { | |
bd99dc85 | 1253 | ptrace (PTRACE_SETOPTIONS, lwpid_of (lwp), 0, PTRACE_O_TRACECLONE); |
24a09b5f DJ |
1254 | must_set_ptrace_flags = 0; |
1255 | } | |
0d62e5e8 DJ |
1256 | /* If we are waiting for a particular child, and it exited, |
1257 | linux_wait_for_event will return its exit status. Similarly if | |
1258 | the last child exited. If this is not the last child, however, | |
1259 | do not report it as exited until there is a 'thread exited' response | |
1260 | available in the remote protocol. Instead, just wait for another event. | |
1261 | This should be safe, because if the thread crashed we will already | |
1262 | have reported the termination signal to GDB; that should stop any | |
1263 | in-progress stepping operations, etc. | |
1264 | ||
1265 | Report the exit status of the last thread to exit. This matches | |
1266 | LinuxThreads' behavior. */ | |
1267 | ||
95954743 | 1268 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1269 | { |
bd99dc85 | 1270 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1271 | { |
95954743 PA |
1272 | int pid = pid_of (lwp); |
1273 | struct process_info *process = find_process_pid (pid); | |
5b1c542e | 1274 | |
bd99dc85 | 1275 | delete_lwp (lwp); |
95954743 | 1276 | remove_process (process); |
5b1c542e | 1277 | |
bd99dc85 | 1278 | current_inferior = NULL; |
5b1c542e | 1279 | |
bd99dc85 PA |
1280 | if (WIFEXITED (w)) |
1281 | { | |
1282 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1283 | ourstatus->value.integer = WEXITSTATUS (w); | |
1284 | ||
1285 | if (debug_threads) | |
1286 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1287 | } | |
1288 | else | |
1289 | { | |
1290 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1291 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1292 | ||
1293 | if (debug_threads) | |
1294 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1295 | ||
1296 | } | |
5b1c542e | 1297 | |
95954743 | 1298 | return pid_to_ptid (pid); |
0d62e5e8 | 1299 | } |
da6d8c04 | 1300 | } |
0d62e5e8 | 1301 | else |
da6d8c04 | 1302 | { |
0d62e5e8 DJ |
1303 | if (!WIFSTOPPED (w)) |
1304 | goto retry; | |
da6d8c04 DJ |
1305 | } |
1306 | ||
bd99dc85 PA |
1307 | /* In all-stop, stop all threads. Be careful to only do this if |
1308 | we're about to report an event to GDB. */ | |
1309 | if (!non_stop) | |
1310 | stop_all_lwps (); | |
1311 | ||
5b1c542e | 1312 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1313 | |
bd99dc85 PA |
1314 | if (lwp->suspended && WSTOPSIG (w) == SIGSTOP) |
1315 | { | |
1316 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1317 | and it stopped cleanly, so report as SIG0. The use of | |
1318 | SIGSTOP is an implementation detail. */ | |
1319 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1320 | } | |
1321 | else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP) | |
1322 | { | |
1323 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1324 | but, it stopped for other reasons. Set stop_expected so the | |
1325 | pending SIGSTOP is ignored and the LWP is resumed. */ | |
1326 | lwp->stop_expected = 1; | |
1327 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1328 | } | |
1329 | else | |
1330 | { | |
1331 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1332 | } | |
1333 | ||
1334 | if (debug_threads) | |
95954743 PA |
1335 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
1336 | target_pid_to_str (lwp->head.id), | |
bd99dc85 PA |
1337 | ourstatus->kind, |
1338 | ourstatus->value.sig); | |
1339 | ||
95954743 | 1340 | return lwp->head.id; |
bd99dc85 PA |
1341 | } |
1342 | ||
1343 | /* Get rid of any pending event in the pipe. */ | |
1344 | static void | |
1345 | async_file_flush (void) | |
1346 | { | |
1347 | int ret; | |
1348 | char buf; | |
1349 | ||
1350 | do | |
1351 | ret = read (linux_event_pipe[0], &buf, 1); | |
1352 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1353 | } | |
1354 | ||
1355 | /* Put something in the pipe, so the event loop wakes up. */ | |
1356 | static void | |
1357 | async_file_mark (void) | |
1358 | { | |
1359 | int ret; | |
1360 | ||
1361 | async_file_flush (); | |
1362 | ||
1363 | do | |
1364 | ret = write (linux_event_pipe[1], "+", 1); | |
1365 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1366 | ||
1367 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1368 | be awakened anyway. */ | |
1369 | } | |
1370 | ||
95954743 PA |
1371 | static ptid_t |
1372 | linux_wait (ptid_t ptid, | |
1373 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1374 | { |
95954743 | 1375 | ptid_t event_ptid; |
bd99dc85 PA |
1376 | |
1377 | if (debug_threads) | |
95954743 | 1378 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1379 | |
1380 | /* Flush the async file first. */ | |
1381 | if (target_is_async_p ()) | |
1382 | async_file_flush (); | |
1383 | ||
95954743 | 1384 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1385 | |
1386 | /* If at least one stop was reported, there may be more. A single | |
1387 | SIGCHLD can signal more than one child stop. */ | |
1388 | if (target_is_async_p () | |
1389 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1390 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1391 | async_file_mark (); |
1392 | ||
1393 | return event_ptid; | |
da6d8c04 DJ |
1394 | } |
1395 | ||
fd500816 DJ |
1396 | /* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if |
1397 | thread groups are in use, we need to use tkill. */ | |
1398 | ||
1399 | static int | |
a1928bad | 1400 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 DJ |
1401 | { |
1402 | static int tkill_failed; | |
1403 | ||
1404 | errno = 0; | |
1405 | ||
1406 | #ifdef SYS_tkill | |
1407 | if (!tkill_failed) | |
1408 | { | |
1409 | int ret = syscall (SYS_tkill, lwpid, signo); | |
1410 | if (errno != ENOSYS) | |
1b3f6016 | 1411 | return ret; |
fd500816 DJ |
1412 | errno = 0; |
1413 | tkill_failed = 1; | |
1414 | } | |
1415 | #endif | |
1416 | ||
1417 | return kill (lwpid, signo); | |
1418 | } | |
1419 | ||
0d62e5e8 DJ |
1420 | static void |
1421 | send_sigstop (struct inferior_list_entry *entry) | |
1422 | { | |
54a0b537 | 1423 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1424 | int pid; |
0d62e5e8 | 1425 | |
54a0b537 | 1426 | if (lwp->stopped) |
0d62e5e8 DJ |
1427 | return; |
1428 | ||
bd99dc85 PA |
1429 | pid = lwpid_of (lwp); |
1430 | ||
0d62e5e8 DJ |
1431 | /* If we already have a pending stop signal for this process, don't |
1432 | send another. */ | |
54a0b537 | 1433 | if (lwp->stop_expected) |
0d62e5e8 | 1434 | { |
ae13219e | 1435 | if (debug_threads) |
bd99dc85 | 1436 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e DJ |
1437 | |
1438 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1439 | will receive the SIGSTOP event (instead of silently resuming and | |
1440 | waiting again). It'll be reset below. */ | |
54a0b537 | 1441 | lwp->stop_expected = 0; |
0d62e5e8 DJ |
1442 | return; |
1443 | } | |
1444 | ||
1445 | if (debug_threads) | |
bd99dc85 | 1446 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1447 | |
bd99dc85 | 1448 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1449 | } |
1450 | ||
95954743 PA |
1451 | static void |
1452 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
1453 | { | |
1454 | /* It's dead, really. */ | |
1455 | lwp->dead = 1; | |
1456 | ||
1457 | /* Store the exit status for later. */ | |
1458 | lwp->status_pending_p = 1; | |
1459 | lwp->status_pending = wstat; | |
1460 | ||
1461 | /* So that check_removed_breakpoint doesn't try to figure out if | |
1462 | this is stopped at a breakpoint. */ | |
1463 | lwp->pending_is_breakpoint = 0; | |
1464 | ||
1465 | /* Prevent trying to stop it. */ | |
1466 | lwp->stopped = 1; | |
1467 | ||
1468 | /* No further stops are expected from a dead lwp. */ | |
1469 | lwp->stop_expected = 0; | |
1470 | } | |
1471 | ||
0d62e5e8 DJ |
1472 | static void |
1473 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1474 | { | |
54a0b537 | 1475 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1476 | struct thread_info *saved_inferior; |
a1928bad | 1477 | int wstat; |
95954743 PA |
1478 | ptid_t saved_tid; |
1479 | ptid_t ptid; | |
0d62e5e8 | 1480 | |
54a0b537 | 1481 | if (lwp->stopped) |
0d62e5e8 DJ |
1482 | return; |
1483 | ||
1484 | saved_inferior = current_inferior; | |
bd99dc85 PA |
1485 | if (saved_inferior != NULL) |
1486 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1487 | else | |
95954743 | 1488 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 1489 | |
95954743 | 1490 | ptid = lwp->head.id; |
bd99dc85 PA |
1491 | |
1492 | linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
1493 | |
1494 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1495 | and record the pending SIGSTOP. If the process exited, just | |
1496 | return. */ | |
1497 | if (WIFSTOPPED (wstat) | |
1498 | && WSTOPSIG (wstat) != SIGSTOP) | |
1499 | { | |
1500 | if (debug_threads) | |
24a09b5f | 1501 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
bd99dc85 | 1502 | lwpid_of (lwp), wstat); |
c35fafde PA |
1503 | |
1504 | /* Do not leave a pending single-step finish to be reported to | |
1505 | the client. The client will give us a new action for this | |
1506 | thread, possibly a continue request --- otherwise, the client | |
1507 | would consider this pending SIGTRAP reported later a spurious | |
1508 | signal. */ | |
1509 | if (WSTOPSIG (wstat) == SIGTRAP | |
1510 | && lwp->stepping | |
1511 | && !linux_stopped_by_watchpoint ()) | |
1512 | { | |
1513 | if (debug_threads) | |
1514 | fprintf (stderr, " single-step SIGTRAP ignored\n"); | |
1515 | } | |
1516 | else | |
1517 | { | |
1518 | lwp->status_pending_p = 1; | |
1519 | lwp->status_pending = wstat; | |
1520 | } | |
54a0b537 | 1521 | lwp->stop_expected = 1; |
0d62e5e8 | 1522 | } |
95954743 PA |
1523 | else if (!WIFSTOPPED (wstat)) |
1524 | { | |
1525 | if (debug_threads) | |
1526 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
1527 | lwpid_of (lwp)); | |
1528 | ||
1529 | /* Leave this status pending for the next time we're able to | |
1530 | report it. In the mean time, we'll report this lwp as dead | |
1531 | to GDB, so GDB doesn't try to read registers and memory from | |
1532 | it. */ | |
1533 | mark_lwp_dead (lwp, wstat); | |
1534 | } | |
0d62e5e8 | 1535 | |
bd99dc85 | 1536 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
1537 | current_inferior = saved_inferior; |
1538 | else | |
1539 | { | |
1540 | if (debug_threads) | |
1541 | fprintf (stderr, "Previously current thread died.\n"); | |
1542 | ||
bd99dc85 PA |
1543 | if (non_stop) |
1544 | { | |
1545 | /* We can't change the current inferior behind GDB's back, | |
1546 | otherwise, a subsequent command may apply to the wrong | |
1547 | process. */ | |
1548 | current_inferior = NULL; | |
1549 | } | |
1550 | else | |
1551 | { | |
1552 | /* Set a valid thread as current. */ | |
1553 | set_desired_inferior (0); | |
1554 | } | |
0d62e5e8 DJ |
1555 | } |
1556 | } | |
1557 | ||
1558 | static void | |
54a0b537 | 1559 | stop_all_lwps (void) |
0d62e5e8 DJ |
1560 | { |
1561 | stopping_threads = 1; | |
54a0b537 PA |
1562 | for_each_inferior (&all_lwps, send_sigstop); |
1563 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
1564 | stopping_threads = 0; |
1565 | } | |
1566 | ||
da6d8c04 DJ |
1567 | /* Resume execution of the inferior process. |
1568 | If STEP is nonzero, single-step it. | |
1569 | If SIGNAL is nonzero, give it that signal. */ | |
1570 | ||
ce3a066d | 1571 | static void |
54a0b537 PA |
1572 | linux_resume_one_lwp (struct inferior_list_entry *entry, |
1573 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 1574 | { |
54a0b537 | 1575 | struct lwp_info *lwp = (struct lwp_info *) entry; |
0d62e5e8 DJ |
1576 | struct thread_info *saved_inferior; |
1577 | ||
54a0b537 | 1578 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
1579 | return; |
1580 | ||
1581 | /* If we have pending signals or status, and a new signal, enqueue the | |
1582 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1583 | breakpoint; it will be picked up again below. */ | |
1584 | if (signal != 0 | |
54a0b537 PA |
1585 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
1586 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
1587 | { |
1588 | struct pending_signals *p_sig; | |
bca929d3 | 1589 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 1590 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 1591 | p_sig->signal = signal; |
32ca6d61 DJ |
1592 | if (info == NULL) |
1593 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1594 | else | |
1595 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 1596 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
1597 | } |
1598 | ||
54a0b537 | 1599 | if (lwp->status_pending_p && !check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
1600 | return; |
1601 | ||
1602 | saved_inferior = current_inferior; | |
54a0b537 | 1603 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
1604 | |
1605 | if (debug_threads) | |
1b3f6016 | 1606 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 1607 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 1608 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
1609 | |
1610 | /* This bit needs some thinking about. If we get a signal that | |
1611 | we must report while a single-step reinsert is still pending, | |
1612 | we often end up resuming the thread. It might be better to | |
1613 | (ew) allow a stack of pending events; then we could be sure that | |
1614 | the reinsert happened right away and not lose any signals. | |
1615 | ||
1616 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 1617 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
1618 | complete correctness, so it won't solve that problem. It may be |
1619 | worthwhile just to solve this one, however. */ | |
54a0b537 | 1620 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
1621 | { |
1622 | if (debug_threads) | |
54a0b537 | 1623 | fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert); |
0d62e5e8 DJ |
1624 | if (step == 0) |
1625 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1626 | step = 1; | |
1627 | ||
1628 | /* Postpone any pending signal. It was enqueued above. */ | |
1629 | signal = 0; | |
1630 | } | |
1631 | ||
54a0b537 | 1632 | check_removed_breakpoint (lwp); |
0d62e5e8 | 1633 | |
aa691b87 | 1634 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 DJ |
1635 | { |
1636 | fprintf (stderr, " "); | |
52fb6437 | 1637 | (*the_low_target.get_pc) (); |
0d62e5e8 DJ |
1638 | } |
1639 | ||
1640 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1641 | a breakpoint. */ | |
54a0b537 | 1642 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
1643 | { |
1644 | struct pending_signals **p_sig; | |
1645 | ||
54a0b537 | 1646 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
1647 | while ((*p_sig)->prev != NULL) |
1648 | p_sig = &(*p_sig)->prev; | |
1649 | ||
1650 | signal = (*p_sig)->signal; | |
32ca6d61 | 1651 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 1652 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 1653 | |
0d62e5e8 DJ |
1654 | free (*p_sig); |
1655 | *p_sig = NULL; | |
1656 | } | |
1657 | ||
1658 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 1659 | get_lwp_thread (lwp)); |
da6d8c04 | 1660 | errno = 0; |
54a0b537 PA |
1661 | lwp->stopped = 0; |
1662 | lwp->stepping = step; | |
bd99dc85 | 1663 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal); |
0d62e5e8 DJ |
1664 | |
1665 | current_inferior = saved_inferior; | |
da6d8c04 | 1666 | if (errno) |
3221518c UW |
1667 | { |
1668 | /* ESRCH from ptrace either means that the thread was already | |
1669 | running (an error) or that it is gone (a race condition). If | |
1670 | it's gone, we will get a notification the next time we wait, | |
1671 | so we can ignore the error. We could differentiate these | |
1672 | two, but it's tricky without waiting; the thread still exists | |
1673 | as a zombie, so sending it signal 0 would succeed. So just | |
1674 | ignore ESRCH. */ | |
1675 | if (errno == ESRCH) | |
1676 | return; | |
1677 | ||
1678 | perror_with_name ("ptrace"); | |
1679 | } | |
da6d8c04 DJ |
1680 | } |
1681 | ||
2bd7c093 PA |
1682 | struct thread_resume_array |
1683 | { | |
1684 | struct thread_resume *resume; | |
1685 | size_t n; | |
1686 | }; | |
64386c31 DJ |
1687 | |
1688 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1689 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1690 | resume request. | |
1691 | ||
1692 | This algorithm is O(threads * resume elements), but resume elements | |
1693 | is small (and will remain small at least until GDB supports thread | |
1694 | suspension). */ | |
2bd7c093 PA |
1695 | static int |
1696 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 1697 | { |
54a0b537 | 1698 | struct lwp_info *lwp; |
64386c31 | 1699 | struct thread_info *thread; |
5544ad89 | 1700 | int ndx; |
2bd7c093 | 1701 | struct thread_resume_array *r; |
64386c31 DJ |
1702 | |
1703 | thread = (struct thread_info *) entry; | |
54a0b537 | 1704 | lwp = get_thread_lwp (thread); |
2bd7c093 | 1705 | r = arg; |
64386c31 | 1706 | |
2bd7c093 | 1707 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
1708 | { |
1709 | ptid_t ptid = r->resume[ndx].thread; | |
1710 | if (ptid_equal (ptid, minus_one_ptid) | |
1711 | || ptid_equal (ptid, entry->id) | |
1712 | || (ptid_is_pid (ptid) | |
1713 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
1714 | || (ptid_get_lwp (ptid) == -1 | |
1715 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
1716 | { | |
1717 | lwp->resume = &r->resume[ndx]; | |
1718 | return 0; | |
1719 | } | |
1720 | } | |
2bd7c093 PA |
1721 | |
1722 | /* No resume action for this thread. */ | |
1723 | lwp->resume = NULL; | |
64386c31 | 1724 | |
2bd7c093 | 1725 | return 0; |
5544ad89 DJ |
1726 | } |
1727 | ||
5544ad89 | 1728 | |
bd99dc85 PA |
1729 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
1730 | static int | |
1731 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 1732 | { |
bd99dc85 | 1733 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 1734 | |
bd99dc85 PA |
1735 | /* LWPs which will not be resumed are not interesting, because |
1736 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 1737 | if (lwp->resume == NULL) |
bd99dc85 | 1738 | return 0; |
64386c31 | 1739 | |
bd99dc85 PA |
1740 | /* If this thread has a removed breakpoint, we won't have any |
1741 | events to report later, so check now. check_removed_breakpoint | |
1742 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1743 | for any thread that we are not otherwise going to resume - this | |
1744 | lets us preserve stopped status when two threads hit a breakpoint. | |
1745 | GDB removes the breakpoint to single-step a particular thread | |
1746 | past it, then re-inserts it and resumes all threads. We want | |
1747 | to report the second thread without resuming it in the interim. */ | |
1748 | if (lwp->status_pending_p) | |
1749 | check_removed_breakpoint (lwp); | |
5544ad89 | 1750 | |
bd99dc85 PA |
1751 | if (lwp->status_pending_p) |
1752 | * (int *) flag_p = 1; | |
c6ecbae5 | 1753 | |
bd99dc85 | 1754 | return 0; |
5544ad89 DJ |
1755 | } |
1756 | ||
1757 | /* This function is called once per thread. We check the thread's resume | |
1758 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 1759 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 1760 | |
bd99dc85 PA |
1761 | For threads which we aren't explicitly told otherwise, we preserve |
1762 | the stepping flag; this is used for stepping over gdbserver-placed | |
1763 | breakpoints. | |
1764 | ||
1765 | If pending_flags was set in any thread, we queue any needed | |
1766 | signals, since we won't actually resume. We already have a pending | |
1767 | event to report, so we don't need to preserve any step requests; | |
1768 | they should be re-issued if necessary. */ | |
1769 | ||
1770 | static int | |
1771 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 1772 | { |
54a0b537 | 1773 | struct lwp_info *lwp; |
5544ad89 | 1774 | struct thread_info *thread; |
bd99dc85 PA |
1775 | int step; |
1776 | int pending_flag = * (int *) arg; | |
5544ad89 DJ |
1777 | |
1778 | thread = (struct thread_info *) entry; | |
54a0b537 | 1779 | lwp = get_thread_lwp (thread); |
5544ad89 | 1780 | |
2bd7c093 | 1781 | if (lwp->resume == NULL) |
bd99dc85 | 1782 | return 0; |
5544ad89 | 1783 | |
bd99dc85 | 1784 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 1785 | { |
bd99dc85 PA |
1786 | if (debug_threads) |
1787 | fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp)); | |
1788 | ||
1789 | if (!lwp->stopped) | |
1790 | { | |
1791 | if (debug_threads) | |
95954743 | 1792 | fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
1793 | |
1794 | lwp->suspended = 1; | |
1795 | send_sigstop (&lwp->head); | |
1796 | } | |
1797 | else | |
1798 | { | |
1799 | if (debug_threads) | |
1800 | { | |
1801 | if (lwp->suspended) | |
1802 | fprintf (stderr, "already stopped/suspended LWP %ld\n", | |
1803 | lwpid_of (lwp)); | |
1804 | else | |
1805 | fprintf (stderr, "already stopped/not suspended LWP %ld\n", | |
1806 | lwpid_of (lwp)); | |
1807 | } | |
32ca6d61 | 1808 | |
bd99dc85 PA |
1809 | /* Make sure we leave the LWP suspended, so we don't try to |
1810 | resume it without GDB telling us to. FIXME: The LWP may | |
1811 | have been stopped in an internal event that was not meant | |
1812 | to be notified back to GDB (e.g., gdbserver breakpoint), | |
1813 | so we should be reporting a stop event in that case | |
1814 | too. */ | |
1815 | lwp->suspended = 1; | |
1816 | } | |
32ca6d61 | 1817 | |
bd99dc85 PA |
1818 | /* For stop requests, we're done. */ |
1819 | lwp->resume = NULL; | |
1820 | return 0; | |
5544ad89 | 1821 | } |
bd99dc85 PA |
1822 | else |
1823 | lwp->suspended = 0; | |
5544ad89 | 1824 | |
bd99dc85 PA |
1825 | /* If this thread which is about to be resumed has a pending status, |
1826 | then don't resume any threads - we can just report the pending | |
1827 | status. Make sure to queue any signals that would otherwise be | |
1828 | sent. In all-stop mode, we do this decision based on if *any* | |
1829 | thread has a pending status. */ | |
1830 | if (non_stop) | |
1831 | resume_status_pending_p (&lwp->head, &pending_flag); | |
5544ad89 | 1832 | |
bd99dc85 PA |
1833 | if (!pending_flag) |
1834 | { | |
1835 | if (debug_threads) | |
1836 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 1837 | |
95954743 | 1838 | if (ptid_equal (lwp->resume->thread, minus_one_ptid) |
bd99dc85 PA |
1839 | && lwp->stepping |
1840 | && lwp->pending_is_breakpoint) | |
1841 | step = 1; | |
1842 | else | |
1843 | step = (lwp->resume->kind == resume_step); | |
5544ad89 | 1844 | |
bd99dc85 PA |
1845 | linux_resume_one_lwp (&lwp->head, step, lwp->resume->sig, NULL); |
1846 | } | |
1847 | else | |
1848 | { | |
1849 | if (debug_threads) | |
1850 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 1851 | |
bd99dc85 PA |
1852 | /* If we have a new signal, enqueue the signal. */ |
1853 | if (lwp->resume->sig != 0) | |
1854 | { | |
1855 | struct pending_signals *p_sig; | |
1856 | p_sig = xmalloc (sizeof (*p_sig)); | |
1857 | p_sig->prev = lwp->pending_signals; | |
1858 | p_sig->signal = lwp->resume->sig; | |
1859 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1860 | ||
1861 | /* If this is the same signal we were previously stopped by, | |
1862 | make sure to queue its siginfo. We can ignore the return | |
1863 | value of ptrace; if it fails, we'll skip | |
1864 | PTRACE_SETSIGINFO. */ | |
1865 | if (WIFSTOPPED (lwp->last_status) | |
1866 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
1867 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1868 | ||
1869 | lwp->pending_signals = p_sig; | |
1870 | } | |
1871 | } | |
5544ad89 | 1872 | |
bd99dc85 | 1873 | lwp->resume = NULL; |
5544ad89 | 1874 | return 0; |
0d62e5e8 DJ |
1875 | } |
1876 | ||
1877 | static void | |
2bd7c093 | 1878 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 1879 | { |
5544ad89 | 1880 | int pending_flag; |
2bd7c093 | 1881 | struct thread_resume_array array = { resume_info, n }; |
c6ecbae5 | 1882 | |
2bd7c093 | 1883 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 DJ |
1884 | |
1885 | /* If there is a thread which would otherwise be resumed, which | |
1886 | has a pending status, then don't resume any threads - we can just | |
1887 | report the pending status. Make sure to queue any signals | |
bd99dc85 PA |
1888 | that would otherwise be sent. In non-stop mode, we'll apply this |
1889 | logic to each thread individually. */ | |
5544ad89 | 1890 | pending_flag = 0; |
bd99dc85 PA |
1891 | if (!non_stop) |
1892 | find_inferior (&all_lwps, resume_status_pending_p, &pending_flag); | |
5544ad89 DJ |
1893 | |
1894 | if (debug_threads) | |
1895 | { | |
1896 | if (pending_flag) | |
1897 | fprintf (stderr, "Not resuming, pending status\n"); | |
1898 | else | |
1899 | fprintf (stderr, "Resuming, no pending status\n"); | |
1900 | } | |
1901 | ||
bd99dc85 | 1902 | find_inferior (&all_threads, linux_resume_one_thread, &pending_flag); |
0d62e5e8 DJ |
1903 | } |
1904 | ||
1905 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
1906 | |
1907 | int | |
0a30fbc4 | 1908 | register_addr (int regnum) |
da6d8c04 DJ |
1909 | { |
1910 | int addr; | |
1911 | ||
2ec06d2e | 1912 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
1913 | error ("Invalid register number %d.", regnum); |
1914 | ||
2ec06d2e | 1915 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
1916 | |
1917 | return addr; | |
1918 | } | |
1919 | ||
58caa3dc | 1920 | /* Fetch one register. */ |
da6d8c04 DJ |
1921 | static void |
1922 | fetch_register (int regno) | |
1923 | { | |
1924 | CORE_ADDR regaddr; | |
48d93c75 | 1925 | int i, size; |
0d62e5e8 | 1926 | char *buf; |
95954743 | 1927 | int pid; |
da6d8c04 | 1928 | |
2ec06d2e | 1929 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 1930 | return; |
2ec06d2e | 1931 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 1932 | return; |
da6d8c04 | 1933 | |
0a30fbc4 DJ |
1934 | regaddr = register_addr (regno); |
1935 | if (regaddr == -1) | |
1936 | return; | |
95954743 PA |
1937 | |
1938 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
1939 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
1940 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
1941 | buf = alloca (size); |
1942 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
1943 | { |
1944 | errno = 0; | |
0d62e5e8 | 1945 | *(PTRACE_XFER_TYPE *) (buf + i) = |
95954743 | 1946 | ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
da6d8c04 DJ |
1947 | regaddr += sizeof (PTRACE_XFER_TYPE); |
1948 | if (errno != 0) | |
1949 | { | |
1950 | /* Warning, not error, in case we are attached; sometimes the | |
1951 | kernel doesn't let us at the registers. */ | |
1952 | char *err = strerror (errno); | |
1953 | char *msg = alloca (strlen (err) + 128); | |
1954 | sprintf (msg, "reading register %d: %s", regno, err); | |
1955 | error (msg); | |
1956 | goto error_exit; | |
1957 | } | |
1958 | } | |
ee1a7ae4 UW |
1959 | |
1960 | if (the_low_target.supply_ptrace_register) | |
1961 | the_low_target.supply_ptrace_register (regno, buf); | |
5a1f5858 DJ |
1962 | else |
1963 | supply_register (regno, buf); | |
0d62e5e8 | 1964 | |
da6d8c04 DJ |
1965 | error_exit:; |
1966 | } | |
1967 | ||
1968 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
1969 | static void |
1970 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 DJ |
1971 | { |
1972 | if (regno == -1 || regno == 0) | |
2ec06d2e | 1973 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
1974 | fetch_register (regno); |
1975 | else | |
1976 | fetch_register (regno); | |
1977 | } | |
1978 | ||
1979 | /* Store our register values back into the inferior. | |
1980 | If REGNO is -1, do this for all registers. | |
1981 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
1982 | static void |
1983 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
1984 | { |
1985 | CORE_ADDR regaddr; | |
48d93c75 | 1986 | int i, size; |
0d62e5e8 | 1987 | char *buf; |
da6d8c04 DJ |
1988 | |
1989 | if (regno >= 0) | |
1990 | { | |
2ec06d2e | 1991 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
1992 | return; |
1993 | ||
bc1e36ca | 1994 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
1995 | return; |
1996 | ||
1997 | regaddr = register_addr (regno); | |
1998 | if (regaddr == -1) | |
da6d8c04 | 1999 | return; |
da6d8c04 | 2000 | errno = 0; |
48d93c75 UW |
2001 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2002 | & - sizeof (PTRACE_XFER_TYPE); | |
2003 | buf = alloca (size); | |
2004 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2005 | |
2006 | if (the_low_target.collect_ptrace_register) | |
2007 | the_low_target.collect_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2008 | else |
2009 | collect_register (regno, buf); | |
ee1a7ae4 | 2010 | |
95954743 | 2011 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2012 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2013 | { |
0a30fbc4 | 2014 | errno = 0; |
95954743 | 2015 | ptrace (PTRACE_POKEUSER, pid, (PTRACE_ARG3_TYPE) regaddr, |
2ff29de4 | 2016 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
2017 | if (errno != 0) |
2018 | { | |
1b3f6016 PA |
2019 | /* At this point, ESRCH should mean the process is |
2020 | already gone, in which case we simply ignore attempts | |
2021 | to change its registers. See also the related | |
2022 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2023 | if (errno == ESRCH) |
2024 | return; | |
2025 | ||
bc1e36ca DJ |
2026 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
2027 | { | |
2028 | char *err = strerror (errno); | |
2029 | char *msg = alloca (strlen (err) + 128); | |
2030 | sprintf (msg, "writing register %d: %s", | |
2031 | regno, err); | |
2032 | error (msg); | |
2033 | return; | |
2034 | } | |
da6d8c04 | 2035 | } |
2ff29de4 | 2036 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2037 | } |
da6d8c04 DJ |
2038 | } |
2039 | else | |
2ec06d2e | 2040 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 2041 | usr_store_inferior_registers (regno); |
da6d8c04 | 2042 | } |
58caa3dc DJ |
2043 | #endif /* HAVE_LINUX_USRREGS */ |
2044 | ||
2045 | ||
2046 | ||
2047 | #ifdef HAVE_LINUX_REGSETS | |
2048 | ||
2049 | static int | |
0d62e5e8 | 2050 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
2051 | { |
2052 | struct regset_info *regset; | |
e9d25b98 | 2053 | int saw_general_regs = 0; |
95954743 | 2054 | int pid; |
58caa3dc DJ |
2055 | |
2056 | regset = target_regsets; | |
2057 | ||
95954743 | 2058 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2059 | while (regset->size >= 0) |
2060 | { | |
2061 | void *buf; | |
2062 | int res; | |
2063 | ||
52fa2412 | 2064 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2065 | { |
2066 | regset ++; | |
2067 | continue; | |
2068 | } | |
2069 | ||
bca929d3 | 2070 | buf = xmalloc (regset->size); |
dfb64f85 | 2071 | #ifndef __sparc__ |
95954743 | 2072 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2073 | #else |
95954743 | 2074 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2075 | #endif |
58caa3dc DJ |
2076 | if (res < 0) |
2077 | { | |
2078 | if (errno == EIO) | |
2079 | { | |
52fa2412 UW |
2080 | /* If we get EIO on a regset, do not try it again for |
2081 | this process. */ | |
2082 | disabled_regsets[regset - target_regsets] = 1; | |
2083 | continue; | |
58caa3dc DJ |
2084 | } |
2085 | else | |
2086 | { | |
0d62e5e8 | 2087 | char s[256]; |
95954743 PA |
2088 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
2089 | pid); | |
0d62e5e8 | 2090 | perror (s); |
58caa3dc DJ |
2091 | } |
2092 | } | |
e9d25b98 DJ |
2093 | else if (regset->type == GENERAL_REGS) |
2094 | saw_general_regs = 1; | |
58caa3dc DJ |
2095 | regset->store_function (buf); |
2096 | regset ++; | |
2097 | } | |
e9d25b98 DJ |
2098 | if (saw_general_regs) |
2099 | return 0; | |
2100 | else | |
2101 | return 1; | |
58caa3dc DJ |
2102 | } |
2103 | ||
2104 | static int | |
0d62e5e8 | 2105 | regsets_store_inferior_registers () |
58caa3dc DJ |
2106 | { |
2107 | struct regset_info *regset; | |
e9d25b98 | 2108 | int saw_general_regs = 0; |
95954743 | 2109 | int pid; |
58caa3dc DJ |
2110 | |
2111 | regset = target_regsets; | |
2112 | ||
95954743 | 2113 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2114 | while (regset->size >= 0) |
2115 | { | |
2116 | void *buf; | |
2117 | int res; | |
2118 | ||
52fa2412 | 2119 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2120 | { |
2121 | regset ++; | |
2122 | continue; | |
2123 | } | |
2124 | ||
bca929d3 | 2125 | buf = xmalloc (regset->size); |
545587ee DJ |
2126 | |
2127 | /* First fill the buffer with the current register set contents, | |
2128 | in case there are any items in the kernel's regset that are | |
2129 | not in gdbserver's regcache. */ | |
dfb64f85 | 2130 | #ifndef __sparc__ |
95954743 | 2131 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2132 | #else |
95954743 | 2133 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2134 | #endif |
545587ee DJ |
2135 | |
2136 | if (res == 0) | |
2137 | { | |
2138 | /* Then overlay our cached registers on that. */ | |
2139 | regset->fill_function (buf); | |
2140 | ||
2141 | /* Only now do we write the register set. */ | |
dfb64f85 | 2142 | #ifndef __sparc__ |
95954743 | 2143 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 2144 | #else |
95954743 | 2145 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 2146 | #endif |
545587ee DJ |
2147 | } |
2148 | ||
58caa3dc DJ |
2149 | if (res < 0) |
2150 | { | |
2151 | if (errno == EIO) | |
2152 | { | |
52fa2412 UW |
2153 | /* If we get EIO on a regset, do not try it again for |
2154 | this process. */ | |
2155 | disabled_regsets[regset - target_regsets] = 1; | |
2156 | continue; | |
58caa3dc | 2157 | } |
3221518c UW |
2158 | else if (errno == ESRCH) |
2159 | { | |
1b3f6016 PA |
2160 | /* At this point, ESRCH should mean the process is |
2161 | already gone, in which case we simply ignore attempts | |
2162 | to change its registers. See also the related | |
2163 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2164 | return 0; |
2165 | } | |
58caa3dc DJ |
2166 | else |
2167 | { | |
ce3a066d | 2168 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
2169 | } |
2170 | } | |
e9d25b98 DJ |
2171 | else if (regset->type == GENERAL_REGS) |
2172 | saw_general_regs = 1; | |
58caa3dc | 2173 | regset ++; |
09ec9b38 | 2174 | free (buf); |
58caa3dc | 2175 | } |
e9d25b98 DJ |
2176 | if (saw_general_regs) |
2177 | return 0; | |
2178 | else | |
2179 | return 1; | |
ce3a066d | 2180 | return 0; |
58caa3dc DJ |
2181 | } |
2182 | ||
2183 | #endif /* HAVE_LINUX_REGSETS */ | |
2184 | ||
2185 | ||
2186 | void | |
ce3a066d | 2187 | linux_fetch_registers (int regno) |
58caa3dc DJ |
2188 | { |
2189 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2190 | if (regsets_fetch_inferior_registers () == 0) |
2191 | return; | |
58caa3dc DJ |
2192 | #endif |
2193 | #ifdef HAVE_LINUX_USRREGS | |
2194 | usr_fetch_inferior_registers (regno); | |
2195 | #endif | |
2196 | } | |
2197 | ||
2198 | void | |
ce3a066d | 2199 | linux_store_registers (int regno) |
58caa3dc DJ |
2200 | { |
2201 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2202 | if (regsets_store_inferior_registers () == 0) |
2203 | return; | |
58caa3dc DJ |
2204 | #endif |
2205 | #ifdef HAVE_LINUX_USRREGS | |
2206 | usr_store_inferior_registers (regno); | |
2207 | #endif | |
2208 | } | |
2209 | ||
da6d8c04 | 2210 | |
da6d8c04 DJ |
2211 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
2212 | to debugger memory starting at MYADDR. */ | |
2213 | ||
c3e735a6 | 2214 | static int |
f450004a | 2215 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
2216 | { |
2217 | register int i; | |
2218 | /* Round starting address down to longword boundary. */ | |
2219 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2220 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
2221 | register int count |
2222 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
2223 | / sizeof (PTRACE_XFER_TYPE); |
2224 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 2225 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 2226 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
2227 | int fd; |
2228 | char filename[64]; | |
95954743 | 2229 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
2230 | |
2231 | /* Try using /proc. Don't bother for one word. */ | |
2232 | if (len >= 3 * sizeof (long)) | |
2233 | { | |
2234 | /* We could keep this file open and cache it - possibly one per | |
2235 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 2236 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
2237 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
2238 | if (fd == -1) | |
2239 | goto no_proc; | |
2240 | ||
2241 | /* If pread64 is available, use it. It's faster if the kernel | |
2242 | supports it (only one syscall), and it's 64-bit safe even on | |
2243 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
2244 | application). */ | |
2245 | #ifdef HAVE_PREAD64 | |
2246 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
2247 | #else | |
2248 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len) | |
2249 | #endif | |
2250 | { | |
2251 | close (fd); | |
2252 | goto no_proc; | |
2253 | } | |
2254 | ||
2255 | close (fd); | |
2256 | return 0; | |
2257 | } | |
da6d8c04 | 2258 | |
fd462a61 | 2259 | no_proc: |
da6d8c04 DJ |
2260 | /* Read all the longwords */ |
2261 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2262 | { | |
c3e735a6 | 2263 | errno = 0; |
95954743 | 2264 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
c3e735a6 DJ |
2265 | if (errno) |
2266 | return errno; | |
da6d8c04 DJ |
2267 | } |
2268 | ||
2269 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
2270 | memcpy (myaddr, |
2271 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
2272 | len); | |
c3e735a6 DJ |
2273 | |
2274 | return 0; | |
da6d8c04 DJ |
2275 | } |
2276 | ||
2277 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
2278 | to inferior's memory at MEMADDR. | |
2279 | On failure (cannot write the inferior) | |
2280 | returns the value of errno. */ | |
2281 | ||
ce3a066d | 2282 | static int |
f450004a | 2283 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
2284 | { |
2285 | register int i; | |
2286 | /* Round starting address down to longword boundary. */ | |
2287 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2288 | /* Round ending address up; get number of longwords that makes. */ | |
2289 | register int count | |
2290 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
2291 | /* Allocate buffer of that many longwords. */ | |
2292 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 2293 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 2294 | |
0d62e5e8 DJ |
2295 | if (debug_threads) |
2296 | { | |
2297 | fprintf (stderr, "Writing %02x to %08lx\n", (unsigned)myaddr[0], (long)memaddr); | |
2298 | } | |
2299 | ||
da6d8c04 DJ |
2300 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
2301 | ||
95954743 | 2302 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
da6d8c04 DJ |
2303 | |
2304 | if (count > 1) | |
2305 | { | |
2306 | buffer[count - 1] | |
95954743 | 2307 | = ptrace (PTRACE_PEEKTEXT, pid, |
d844cde6 DJ |
2308 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
2309 | * sizeof (PTRACE_XFER_TYPE)), | |
2310 | 0); | |
da6d8c04 DJ |
2311 | } |
2312 | ||
2313 | /* Copy data to be written over corresponding part of buffer */ | |
2314 | ||
2315 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
2316 | ||
2317 | /* Write the entire buffer. */ | |
2318 | ||
2319 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2320 | { | |
2321 | errno = 0; | |
95954743 | 2322 | ptrace (PTRACE_POKETEXT, pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
2323 | if (errno) |
2324 | return errno; | |
2325 | } | |
2326 | ||
2327 | return 0; | |
2328 | } | |
2f2893d9 | 2329 | |
24a09b5f DJ |
2330 | static int linux_supports_tracefork_flag; |
2331 | ||
51c2684e | 2332 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 2333 | |
51c2684e DJ |
2334 | static int |
2335 | linux_tracefork_grandchild (void *arg) | |
2336 | { | |
2337 | _exit (0); | |
2338 | } | |
2339 | ||
7407e2de AS |
2340 | #define STACK_SIZE 4096 |
2341 | ||
51c2684e DJ |
2342 | static int |
2343 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
2344 | { |
2345 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
2346 | kill (getpid (), SIGSTOP); | |
7407e2de AS |
2347 | #ifdef __ia64__ |
2348 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
2349 | CLONE_VM | SIGCHLD, NULL); | |
2350 | #else | |
2351 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
2352 | CLONE_VM | SIGCHLD, NULL); | |
2353 | #endif | |
24a09b5f DJ |
2354 | _exit (0); |
2355 | } | |
2356 | ||
bd99dc85 PA |
2357 | /* Wrapper function for waitpid which handles EINTR, and emulates |
2358 | __WALL for systems where that is not available. */ | |
24a09b5f DJ |
2359 | |
2360 | static int | |
2361 | my_waitpid (int pid, int *status, int flags) | |
2362 | { | |
bd99dc85 PA |
2363 | int ret, out_errno; |
2364 | ||
2365 | if (debug_threads) | |
2366 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
2367 | ||
2368 | if (flags & __WALL) | |
24a09b5f | 2369 | { |
bd99dc85 PA |
2370 | sigset_t block_mask, org_mask, wake_mask; |
2371 | int wnohang; | |
2372 | ||
2373 | wnohang = (flags & WNOHANG) != 0; | |
2374 | flags &= ~(__WALL | __WCLONE); | |
2375 | flags |= WNOHANG; | |
2376 | ||
2377 | /* Block all signals while here. This avoids knowing about | |
2378 | LinuxThread's signals. */ | |
2379 | sigfillset (&block_mask); | |
2380 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
2381 | ||
2382 | /* ... except during the sigsuspend below. */ | |
2383 | sigemptyset (&wake_mask); | |
2384 | ||
2385 | while (1) | |
2386 | { | |
2387 | /* Since all signals are blocked, there's no need to check | |
2388 | for EINTR here. */ | |
2389 | ret = waitpid (pid, status, flags); | |
2390 | out_errno = errno; | |
2391 | ||
2392 | if (ret == -1 && out_errno != ECHILD) | |
2393 | break; | |
2394 | else if (ret > 0) | |
2395 | break; | |
2396 | ||
2397 | if (flags & __WCLONE) | |
2398 | { | |
2399 | /* We've tried both flavors now. If WNOHANG is set, | |
2400 | there's nothing else to do, just bail out. */ | |
2401 | if (wnohang) | |
2402 | break; | |
2403 | ||
2404 | if (debug_threads) | |
2405 | fprintf (stderr, "blocking\n"); | |
2406 | ||
2407 | /* Block waiting for signals. */ | |
2408 | sigsuspend (&wake_mask); | |
2409 | } | |
2410 | ||
2411 | flags ^= __WCLONE; | |
2412 | } | |
2413 | ||
2414 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
24a09b5f | 2415 | } |
bd99dc85 PA |
2416 | else |
2417 | { | |
2418 | do | |
2419 | ret = waitpid (pid, status, flags); | |
2420 | while (ret == -1 && errno == EINTR); | |
2421 | out_errno = errno; | |
2422 | } | |
2423 | ||
2424 | if (debug_threads) | |
2425 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
2426 | pid, flags, status ? *status : -1, ret); | |
24a09b5f | 2427 | |
bd99dc85 | 2428 | errno = out_errno; |
24a09b5f DJ |
2429 | return ret; |
2430 | } | |
2431 | ||
2432 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make | |
2433 | sure that we can enable the option, and that it had the desired | |
2434 | effect. */ | |
2435 | ||
2436 | static void | |
2437 | linux_test_for_tracefork (void) | |
2438 | { | |
2439 | int child_pid, ret, status; | |
2440 | long second_pid; | |
bca929d3 | 2441 | char *stack = xmalloc (STACK_SIZE * 4); |
24a09b5f DJ |
2442 | |
2443 | linux_supports_tracefork_flag = 0; | |
2444 | ||
51c2684e | 2445 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
2446 | #ifdef __ia64__ |
2447 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
2448 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2449 | #else | |
2450 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, | |
2451 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2452 | #endif | |
24a09b5f | 2453 | if (child_pid == -1) |
51c2684e | 2454 | perror_with_name ("clone"); |
24a09b5f DJ |
2455 | |
2456 | ret = my_waitpid (child_pid, &status, 0); | |
2457 | if (ret == -1) | |
2458 | perror_with_name ("waitpid"); | |
2459 | else if (ret != child_pid) | |
2460 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
2461 | if (! WIFSTOPPED (status)) | |
2462 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
2463 | ||
2464 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); | |
2465 | if (ret != 0) | |
2466 | { | |
2467 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2468 | if (ret != 0) | |
2469 | { | |
2470 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2471 | return; | |
2472 | } | |
2473 | ||
2474 | ret = my_waitpid (child_pid, &status, 0); | |
2475 | if (ret != child_pid) | |
2476 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
2477 | else if (!WIFSIGNALED (status)) | |
2478 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
2479 | "killed child", status); | |
2480 | ||
2481 | return; | |
2482 | } | |
2483 | ||
2484 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
2485 | if (ret != 0) | |
2486 | warning ("linux_test_for_tracefork: failed to resume child"); | |
2487 | ||
2488 | ret = my_waitpid (child_pid, &status, 0); | |
2489 | ||
2490 | if (ret == child_pid && WIFSTOPPED (status) | |
2491 | && status >> 16 == PTRACE_EVENT_FORK) | |
2492 | { | |
2493 | second_pid = 0; | |
2494 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
2495 | if (ret == 0 && second_pid != 0) | |
2496 | { | |
2497 | int second_status; | |
2498 | ||
2499 | linux_supports_tracefork_flag = 1; | |
2500 | my_waitpid (second_pid, &second_status, 0); | |
2501 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
2502 | if (ret != 0) | |
2503 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
2504 | my_waitpid (second_pid, &status, 0); | |
2505 | } | |
2506 | } | |
2507 | else | |
2508 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
2509 | "(%d, status 0x%x)", ret, status); | |
2510 | ||
2511 | do | |
2512 | { | |
2513 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2514 | if (ret != 0) | |
2515 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2516 | my_waitpid (child_pid, &status, 0); | |
2517 | } | |
2518 | while (WIFSTOPPED (status)); | |
51c2684e DJ |
2519 | |
2520 | free (stack); | |
24a09b5f DJ |
2521 | } |
2522 | ||
2523 | ||
2f2893d9 DJ |
2524 | static void |
2525 | linux_look_up_symbols (void) | |
2526 | { | |
0d62e5e8 | 2527 | #ifdef USE_THREAD_DB |
95954743 PA |
2528 | struct process_info *proc = current_process (); |
2529 | ||
2530 | if (proc->private->thread_db_active) | |
0d62e5e8 DJ |
2531 | return; |
2532 | ||
95954743 PA |
2533 | proc->private->thread_db_active |
2534 | = thread_db_init (!linux_supports_tracefork_flag); | |
0d62e5e8 DJ |
2535 | #endif |
2536 | } | |
2537 | ||
e5379b03 | 2538 | static void |
ef57601b | 2539 | linux_request_interrupt (void) |
e5379b03 | 2540 | { |
a1928bad | 2541 | extern unsigned long signal_pid; |
e5379b03 | 2542 | |
95954743 PA |
2543 | if (!ptid_equal (cont_thread, null_ptid) |
2544 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 2545 | { |
54a0b537 | 2546 | struct lwp_info *lwp; |
bd99dc85 | 2547 | int lwpid; |
e5379b03 | 2548 | |
54a0b537 | 2549 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
2550 | lwpid = lwpid_of (lwp); |
2551 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
2552 | } |
2553 | else | |
ef57601b | 2554 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
2555 | } |
2556 | ||
aa691b87 RM |
2557 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
2558 | to debugger memory starting at MYADDR. */ | |
2559 | ||
2560 | static int | |
f450004a | 2561 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
2562 | { |
2563 | char filename[PATH_MAX]; | |
2564 | int fd, n; | |
95954743 | 2565 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 2566 | |
95954743 | 2567 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
2568 | |
2569 | fd = open (filename, O_RDONLY); | |
2570 | if (fd < 0) | |
2571 | return -1; | |
2572 | ||
2573 | if (offset != (CORE_ADDR) 0 | |
2574 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
2575 | n = -1; | |
2576 | else | |
2577 | n = read (fd, myaddr, len); | |
2578 | ||
2579 | close (fd); | |
2580 | ||
2581 | return n; | |
2582 | } | |
2583 | ||
e013ee27 OF |
2584 | /* These watchpoint related wrapper functions simply pass on the function call |
2585 | if the target has registered a corresponding function. */ | |
2586 | ||
2587 | static int | |
2588 | linux_insert_watchpoint (char type, CORE_ADDR addr, int len) | |
2589 | { | |
2590 | if (the_low_target.insert_watchpoint != NULL) | |
2591 | return the_low_target.insert_watchpoint (type, addr, len); | |
2592 | else | |
2593 | /* Unsupported (see target.h). */ | |
2594 | return 1; | |
2595 | } | |
2596 | ||
2597 | static int | |
2598 | linux_remove_watchpoint (char type, CORE_ADDR addr, int len) | |
2599 | { | |
2600 | if (the_low_target.remove_watchpoint != NULL) | |
2601 | return the_low_target.remove_watchpoint (type, addr, len); | |
2602 | else | |
2603 | /* Unsupported (see target.h). */ | |
2604 | return 1; | |
2605 | } | |
2606 | ||
2607 | static int | |
2608 | linux_stopped_by_watchpoint (void) | |
2609 | { | |
2610 | if (the_low_target.stopped_by_watchpoint != NULL) | |
2611 | return the_low_target.stopped_by_watchpoint (); | |
2612 | else | |
2613 | return 0; | |
2614 | } | |
2615 | ||
2616 | static CORE_ADDR | |
2617 | linux_stopped_data_address (void) | |
2618 | { | |
2619 | if (the_low_target.stopped_data_address != NULL) | |
2620 | return the_low_target.stopped_data_address (); | |
2621 | else | |
2622 | return 0; | |
2623 | } | |
2624 | ||
42c81e2a | 2625 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
2626 | #if defined(__mcoldfire__) |
2627 | /* These should really be defined in the kernel's ptrace.h header. */ | |
2628 | #define PT_TEXT_ADDR 49*4 | |
2629 | #define PT_DATA_ADDR 50*4 | |
2630 | #define PT_TEXT_END_ADDR 51*4 | |
2631 | #endif | |
2632 | ||
2633 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
2634 | to tell gdb about. */ | |
2635 | ||
2636 | static int | |
2637 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
2638 | { | |
2639 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
2640 | unsigned long text, text_end, data; | |
bd99dc85 | 2641 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
2642 | |
2643 | errno = 0; | |
2644 | ||
2645 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
2646 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
2647 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
2648 | ||
2649 | if (errno == 0) | |
2650 | { | |
2651 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
2652 | used by gdb) are relative to the beginning of the program, |
2653 | with the data segment immediately following the text segment. | |
2654 | However, the actual runtime layout in memory may put the data | |
2655 | somewhere else, so when we send gdb a data base-address, we | |
2656 | use the real data base address and subtract the compile-time | |
2657 | data base-address from it (which is just the length of the | |
2658 | text segment). BSS immediately follows data in both | |
2659 | cases. */ | |
52fb6437 NS |
2660 | *text_p = text; |
2661 | *data_p = data - (text_end - text); | |
1b3f6016 | 2662 | |
52fb6437 NS |
2663 | return 1; |
2664 | } | |
2665 | #endif | |
2666 | return 0; | |
2667 | } | |
2668 | #endif | |
2669 | ||
07e059b5 VP |
2670 | static int |
2671 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
2672 | unsigned char *readbuf, unsigned const char *writebuf, |
2673 | CORE_ADDR offset, int len) | |
07e059b5 VP |
2674 | { |
2675 | /* We make the process list snapshot when the object starts to be | |
2676 | read. */ | |
2677 | static const char *buf; | |
2678 | static long len_avail = -1; | |
2679 | static struct buffer buffer; | |
2680 | ||
2681 | DIR *dirp; | |
2682 | ||
2683 | if (strcmp (annex, "processes") != 0) | |
2684 | return 0; | |
2685 | ||
2686 | if (!readbuf || writebuf) | |
2687 | return 0; | |
2688 | ||
2689 | if (offset == 0) | |
2690 | { | |
2691 | if (len_avail != -1 && len_avail != 0) | |
2692 | buffer_free (&buffer); | |
2693 | len_avail = 0; | |
2694 | buf = NULL; | |
2695 | buffer_init (&buffer); | |
2696 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
2697 | ||
2698 | dirp = opendir ("/proc"); | |
2699 | if (dirp) | |
2700 | { | |
1b3f6016 PA |
2701 | struct dirent *dp; |
2702 | while ((dp = readdir (dirp)) != NULL) | |
2703 | { | |
2704 | struct stat statbuf; | |
2705 | char procentry[sizeof ("/proc/4294967295")]; | |
2706 | ||
2707 | if (!isdigit (dp->d_name[0]) | |
2708 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
2709 | continue; | |
2710 | ||
2711 | sprintf (procentry, "/proc/%s", dp->d_name); | |
2712 | if (stat (procentry, &statbuf) == 0 | |
2713 | && S_ISDIR (statbuf.st_mode)) | |
2714 | { | |
2715 | char pathname[128]; | |
2716 | FILE *f; | |
2717 | char cmd[MAXPATHLEN + 1]; | |
2718 | struct passwd *entry; | |
2719 | ||
2720 | sprintf (pathname, "/proc/%s/cmdline", dp->d_name); | |
2721 | entry = getpwuid (statbuf.st_uid); | |
2722 | ||
2723 | if ((f = fopen (pathname, "r")) != NULL) | |
2724 | { | |
2725 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
2726 | if (len > 0) | |
2727 | { | |
2728 | int i; | |
2729 | for (i = 0; i < len; i++) | |
2730 | if (cmd[i] == '\0') | |
2731 | cmd[i] = ' '; | |
2732 | cmd[len] = '\0'; | |
2733 | ||
2734 | buffer_xml_printf ( | |
07e059b5 VP |
2735 | &buffer, |
2736 | "<item>" | |
2737 | "<column name=\"pid\">%s</column>" | |
2738 | "<column name=\"user\">%s</column>" | |
2739 | "<column name=\"command\">%s</column>" | |
2740 | "</item>", | |
2741 | dp->d_name, | |
2742 | entry ? entry->pw_name : "?", | |
2743 | cmd); | |
1b3f6016 PA |
2744 | } |
2745 | fclose (f); | |
2746 | } | |
2747 | } | |
2748 | } | |
07e059b5 | 2749 | |
1b3f6016 | 2750 | closedir (dirp); |
07e059b5 VP |
2751 | } |
2752 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
2753 | buf = buffer_finish (&buffer); | |
2754 | len_avail = strlen (buf); | |
2755 | } | |
2756 | ||
2757 | if (offset >= len_avail) | |
2758 | { | |
2759 | /* Done. Get rid of the data. */ | |
2760 | buffer_free (&buffer); | |
2761 | buf = NULL; | |
2762 | len_avail = 0; | |
2763 | return 0; | |
2764 | } | |
2765 | ||
2766 | if (len > len_avail - offset) | |
2767 | len = len_avail - offset; | |
2768 | memcpy (readbuf, buf + offset, len); | |
2769 | ||
2770 | return len; | |
2771 | } | |
2772 | ||
4aa995e1 PA |
2773 | static int |
2774 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
2775 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
2776 | { | |
2777 | struct siginfo siginfo; | |
2778 | long pid = -1; | |
2779 | ||
2780 | if (current_inferior == NULL) | |
2781 | return -1; | |
2782 | ||
bd99dc85 | 2783 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
2784 | |
2785 | if (debug_threads) | |
2786 | fprintf (stderr, "%s siginfo for lwp %ld.\n", | |
2787 | readbuf != NULL ? "Reading" : "Writing", | |
2788 | pid); | |
2789 | ||
2790 | if (offset > sizeof (siginfo)) | |
2791 | return -1; | |
2792 | ||
2793 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
2794 | return -1; | |
2795 | ||
2796 | if (offset + len > sizeof (siginfo)) | |
2797 | len = sizeof (siginfo) - offset; | |
2798 | ||
2799 | if (readbuf != NULL) | |
2800 | memcpy (readbuf, (char *) &siginfo + offset, len); | |
2801 | else | |
2802 | { | |
2803 | memcpy ((char *) &siginfo + offset, writebuf, len); | |
2804 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) | |
2805 | return -1; | |
2806 | } | |
2807 | ||
2808 | return len; | |
2809 | } | |
2810 | ||
bd99dc85 PA |
2811 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
2812 | so we notice when children change state; as the handler for the | |
2813 | sigsuspend in my_waitpid. */ | |
2814 | ||
2815 | static void | |
2816 | sigchld_handler (int signo) | |
2817 | { | |
2818 | int old_errno = errno; | |
2819 | ||
2820 | if (debug_threads) | |
2821 | /* fprintf is not async-signal-safe, so call write directly. */ | |
2822 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
2823 | ||
2824 | if (target_is_async_p ()) | |
2825 | async_file_mark (); /* trigger a linux_wait */ | |
2826 | ||
2827 | errno = old_errno; | |
2828 | } | |
2829 | ||
2830 | static int | |
2831 | linux_supports_non_stop (void) | |
2832 | { | |
2833 | return 1; | |
2834 | } | |
2835 | ||
2836 | static int | |
2837 | linux_async (int enable) | |
2838 | { | |
2839 | int previous = (linux_event_pipe[0] != -1); | |
2840 | ||
2841 | if (previous != enable) | |
2842 | { | |
2843 | sigset_t mask; | |
2844 | sigemptyset (&mask); | |
2845 | sigaddset (&mask, SIGCHLD); | |
2846 | ||
2847 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
2848 | ||
2849 | if (enable) | |
2850 | { | |
2851 | if (pipe (linux_event_pipe) == -1) | |
2852 | fatal ("creating event pipe failed."); | |
2853 | ||
2854 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
2855 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
2856 | ||
2857 | /* Register the event loop handler. */ | |
2858 | add_file_handler (linux_event_pipe[0], | |
2859 | handle_target_event, NULL); | |
2860 | ||
2861 | /* Always trigger a linux_wait. */ | |
2862 | async_file_mark (); | |
2863 | } | |
2864 | else | |
2865 | { | |
2866 | delete_file_handler (linux_event_pipe[0]); | |
2867 | ||
2868 | close (linux_event_pipe[0]); | |
2869 | close (linux_event_pipe[1]); | |
2870 | linux_event_pipe[0] = -1; | |
2871 | linux_event_pipe[1] = -1; | |
2872 | } | |
2873 | ||
2874 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
2875 | } | |
2876 | ||
2877 | return previous; | |
2878 | } | |
2879 | ||
2880 | static int | |
2881 | linux_start_non_stop (int nonstop) | |
2882 | { | |
2883 | /* Register or unregister from event-loop accordingly. */ | |
2884 | linux_async (nonstop); | |
2885 | return 0; | |
2886 | } | |
2887 | ||
ce3a066d DJ |
2888 | static struct target_ops linux_target_ops = { |
2889 | linux_create_inferior, | |
2890 | linux_attach, | |
2891 | linux_kill, | |
6ad8ae5c | 2892 | linux_detach, |
444d6139 | 2893 | linux_join, |
ce3a066d DJ |
2894 | linux_thread_alive, |
2895 | linux_resume, | |
2896 | linux_wait, | |
2897 | linux_fetch_registers, | |
2898 | linux_store_registers, | |
2899 | linux_read_memory, | |
2900 | linux_write_memory, | |
2f2893d9 | 2901 | linux_look_up_symbols, |
ef57601b | 2902 | linux_request_interrupt, |
aa691b87 | 2903 | linux_read_auxv, |
e013ee27 OF |
2904 | linux_insert_watchpoint, |
2905 | linux_remove_watchpoint, | |
2906 | linux_stopped_by_watchpoint, | |
2907 | linux_stopped_data_address, | |
42c81e2a | 2908 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 2909 | linux_read_offsets, |
dae5f5cf DJ |
2910 | #else |
2911 | NULL, | |
2912 | #endif | |
2913 | #ifdef USE_THREAD_DB | |
2914 | thread_db_get_tls_address, | |
2915 | #else | |
2916 | NULL, | |
52fb6437 | 2917 | #endif |
59a016f0 PA |
2918 | NULL, |
2919 | hostio_last_error_from_errno, | |
07e059b5 | 2920 | linux_qxfer_osdata, |
4aa995e1 | 2921 | linux_xfer_siginfo, |
bd99dc85 PA |
2922 | linux_supports_non_stop, |
2923 | linux_async, | |
2924 | linux_start_non_stop, | |
ce3a066d DJ |
2925 | }; |
2926 | ||
0d62e5e8 DJ |
2927 | static void |
2928 | linux_init_signals () | |
2929 | { | |
2930 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
2931 | to find what the cancel signal actually is. */ | |
254787d4 | 2932 | signal (__SIGRTMIN+1, SIG_IGN); |
0d62e5e8 DJ |
2933 | } |
2934 | ||
da6d8c04 DJ |
2935 | void |
2936 | initialize_low (void) | |
2937 | { | |
bd99dc85 PA |
2938 | struct sigaction sigchld_action; |
2939 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 2940 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
2941 | set_breakpoint_data (the_low_target.breakpoint, |
2942 | the_low_target.breakpoint_len); | |
0d62e5e8 | 2943 | linux_init_signals (); |
24a09b5f | 2944 | linux_test_for_tracefork (); |
52fa2412 UW |
2945 | #ifdef HAVE_LINUX_REGSETS |
2946 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
2947 | ; | |
bca929d3 | 2948 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 2949 | #endif |
bd99dc85 PA |
2950 | |
2951 | sigchld_action.sa_handler = sigchld_handler; | |
2952 | sigemptyset (&sigchld_action.sa_mask); | |
2953 | sigchld_action.sa_flags = SA_RESTART; | |
2954 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 2955 | } |