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" |
d0722149 DE |
22 | #include "ansidecl.h" /* For ATTRIBUTE_PACKED, must be bug in external.h. */ |
23 | #include "elf/common.h" | |
24 | #include "elf/external.h" | |
da6d8c04 | 25 | |
58caa3dc | 26 | #include <sys/wait.h> |
da6d8c04 DJ |
27 | #include <stdio.h> |
28 | #include <sys/param.h> | |
da6d8c04 | 29 | #include <sys/ptrace.h> |
da6d8c04 DJ |
30 | #include <signal.h> |
31 | #include <sys/ioctl.h> | |
32 | #include <fcntl.h> | |
d07c63e7 | 33 | #include <string.h> |
0a30fbc4 DJ |
34 | #include <stdlib.h> |
35 | #include <unistd.h> | |
fa6a77dc | 36 | #include <errno.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
efcbbd14 UW |
43 | #include <sys/stat.h> |
44 | #include <sys/vfs.h> | |
45 | ||
46 | #ifndef SPUFS_MAGIC | |
47 | #define SPUFS_MAGIC 0x23c9b64e | |
48 | #endif | |
da6d8c04 | 49 | |
32ca6d61 DJ |
50 | #ifndef PTRACE_GETSIGINFO |
51 | # define PTRACE_GETSIGINFO 0x4202 | |
52 | # define PTRACE_SETSIGINFO 0x4203 | |
53 | #endif | |
54 | ||
fd462a61 DJ |
55 | #ifndef O_LARGEFILE |
56 | #define O_LARGEFILE 0 | |
57 | #endif | |
58 | ||
24a09b5f DJ |
59 | /* If the system headers did not provide the constants, hard-code the normal |
60 | values. */ | |
61 | #ifndef PTRACE_EVENT_FORK | |
62 | ||
63 | #define PTRACE_SETOPTIONS 0x4200 | |
64 | #define PTRACE_GETEVENTMSG 0x4201 | |
65 | ||
66 | /* options set using PTRACE_SETOPTIONS */ | |
67 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
68 | #define PTRACE_O_TRACEFORK 0x00000002 | |
69 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
70 | #define PTRACE_O_TRACECLONE 0x00000008 | |
71 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
72 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 | |
73 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
74 | ||
75 | /* Wait extended result codes for the above trace options. */ | |
76 | #define PTRACE_EVENT_FORK 1 | |
77 | #define PTRACE_EVENT_VFORK 2 | |
78 | #define PTRACE_EVENT_CLONE 3 | |
79 | #define PTRACE_EVENT_EXEC 4 | |
80 | #define PTRACE_EVENT_VFORK_DONE 5 | |
81 | #define PTRACE_EVENT_EXIT 6 | |
82 | ||
83 | #endif /* PTRACE_EVENT_FORK */ | |
84 | ||
85 | /* We can't always assume that this flag is available, but all systems | |
86 | with the ptrace event handlers also have __WALL, so it's safe to use | |
87 | in some contexts. */ | |
88 | #ifndef __WALL | |
89 | #define __WALL 0x40000000 /* Wait for any child. */ | |
90 | #endif | |
91 | ||
42c81e2a DJ |
92 | #ifdef __UCLIBC__ |
93 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
94 | #define HAS_NOMMU | |
95 | #endif | |
96 | #endif | |
97 | ||
24a09b5f DJ |
98 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
99 | representation of the thread ID. | |
611cb4a5 | 100 | |
54a0b537 | 101 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
102 | the same as the LWP ID. |
103 | ||
104 | ``all_processes'' is keyed by the "overall process ID", which | |
105 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 106 | |
54a0b537 | 107 | struct inferior_list all_lwps; |
0d62e5e8 | 108 | |
24a09b5f DJ |
109 | /* A list of all unknown processes which receive stop signals. Some other |
110 | process will presumably claim each of these as forked children | |
111 | momentarily. */ | |
112 | ||
113 | struct inferior_list stopped_pids; | |
114 | ||
0d62e5e8 DJ |
115 | /* FIXME this is a bit of a hack, and could be removed. */ |
116 | int stopping_threads; | |
117 | ||
118 | /* FIXME make into a target method? */ | |
24a09b5f | 119 | int using_threads = 1; |
24a09b5f | 120 | |
95954743 PA |
121 | /* This flag is true iff we've just created or attached to our first |
122 | inferior but it has not stopped yet. As soon as it does, we need | |
123 | to call the low target's arch_setup callback. Doing this only on | |
124 | the first inferior avoids reinializing the architecture on every | |
125 | inferior, and avoids messing with the register caches of the | |
126 | already running inferiors. NOTE: this assumes all inferiors under | |
127 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
128 | static int new_inferior; |
129 | ||
2acc282a | 130 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 131 | int step, int signal, siginfo_t *info); |
2bd7c093 | 132 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
54a0b537 | 133 | static void stop_all_lwps (void); |
95954743 | 134 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
54a0b537 | 135 | static int check_removed_breakpoint (struct lwp_info *event_child); |
95954743 | 136 | static void *add_lwp (ptid_t ptid); |
97438e3f | 137 | static int my_waitpid (int pid, int *status, int flags); |
c35fafde | 138 | static int linux_stopped_by_watchpoint (void); |
95954743 | 139 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
0d62e5e8 DJ |
140 | |
141 | struct pending_signals | |
142 | { | |
143 | int signal; | |
32ca6d61 | 144 | siginfo_t info; |
0d62e5e8 DJ |
145 | struct pending_signals *prev; |
146 | }; | |
611cb4a5 | 147 | |
d844cde6 | 148 | #define PTRACE_ARG3_TYPE long |
c6ecbae5 | 149 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 150 | |
58caa3dc | 151 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
152 | static char *disabled_regsets; |
153 | static int num_regsets; | |
58caa3dc DJ |
154 | #endif |
155 | ||
bd99dc85 PA |
156 | /* The read/write ends of the pipe registered as waitable file in the |
157 | event loop. */ | |
158 | static int linux_event_pipe[2] = { -1, -1 }; | |
159 | ||
160 | /* True if we're currently in async mode. */ | |
161 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
162 | ||
163 | static void send_sigstop (struct inferior_list_entry *entry); | |
164 | static void wait_for_sigstop (struct inferior_list_entry *entry); | |
165 | ||
d0722149 DE |
166 | /* Accepts an integer PID; Returns a string representing a file that |
167 | can be opened to get info for the child process. | |
168 | Space for the result is malloc'd, caller must free. */ | |
169 | ||
170 | char * | |
171 | linux_child_pid_to_exec_file (int pid) | |
172 | { | |
173 | char *name1, *name2; | |
174 | ||
175 | name1 = xmalloc (MAXPATHLEN); | |
176 | name2 = xmalloc (MAXPATHLEN); | |
177 | memset (name2, 0, MAXPATHLEN); | |
178 | ||
179 | sprintf (name1, "/proc/%d/exe", pid); | |
180 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
181 | { | |
182 | free (name1); | |
183 | return name2; | |
184 | } | |
185 | else | |
186 | { | |
187 | free (name2); | |
188 | return name1; | |
189 | } | |
190 | } | |
191 | ||
192 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
193 | ||
194 | static int | |
195 | elf_64_header_p (const Elf64_External_Ehdr *header) | |
196 | { | |
197 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
198 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
199 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
200 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
201 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
202 | } | |
203 | ||
204 | /* Return non-zero if FILE is a 64-bit ELF file, | |
205 | zero if the file is not a 64-bit ELF file, | |
206 | and -1 if the file is not accessible or doesn't exist. */ | |
207 | ||
208 | int | |
209 | elf_64_file_p (const char *file) | |
210 | { | |
211 | Elf64_External_Ehdr header; | |
212 | int fd; | |
213 | ||
214 | fd = open (file, O_RDONLY); | |
215 | if (fd < 0) | |
216 | return -1; | |
217 | ||
218 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
219 | { | |
220 | close (fd); | |
221 | return 0; | |
222 | } | |
223 | close (fd); | |
224 | ||
225 | return elf_64_header_p (&header); | |
226 | } | |
227 | ||
bd99dc85 PA |
228 | static void |
229 | delete_lwp (struct lwp_info *lwp) | |
230 | { | |
231 | remove_thread (get_lwp_thread (lwp)); | |
232 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 233 | free (lwp->arch_private); |
bd99dc85 PA |
234 | free (lwp); |
235 | } | |
236 | ||
95954743 PA |
237 | /* Add a process to the common process list, and set its private |
238 | data. */ | |
239 | ||
240 | static struct process_info * | |
241 | linux_add_process (int pid, int attached) | |
242 | { | |
243 | struct process_info *proc; | |
244 | ||
245 | /* Is this the first process? If so, then set the arch. */ | |
246 | if (all_processes.head == NULL) | |
247 | new_inferior = 1; | |
248 | ||
249 | proc = add_process (pid, attached); | |
250 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
251 | ||
aa5ca48f DE |
252 | if (the_low_target.new_process != NULL) |
253 | proc->private->arch_private = the_low_target.new_process (); | |
254 | ||
95954743 PA |
255 | return proc; |
256 | } | |
257 | ||
5091eb23 DE |
258 | /* Remove a process from the common process list, |
259 | also freeing all private data. */ | |
260 | ||
261 | static void | |
262 | linux_remove_process (struct process_info *process) | |
263 | { | |
cdbfd419 PP |
264 | struct process_info_private *priv = process->private; |
265 | ||
266 | #ifdef USE_THREAD_DB | |
267 | thread_db_free (process); | |
268 | #endif | |
269 | ||
270 | free (priv->arch_private); | |
271 | free (priv); | |
5091eb23 DE |
272 | remove_process (process); |
273 | } | |
274 | ||
bd99dc85 PA |
275 | /* Handle a GNU/Linux extended wait response. If we see a clone |
276 | event, we need to add the new LWP to our list (and not report the | |
277 | trap to higher layers). */ | |
0d62e5e8 | 278 | |
24a09b5f | 279 | static void |
54a0b537 | 280 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
281 | { |
282 | int event = wstat >> 16; | |
54a0b537 | 283 | struct lwp_info *new_lwp; |
24a09b5f DJ |
284 | |
285 | if (event == PTRACE_EVENT_CLONE) | |
286 | { | |
95954743 | 287 | ptid_t ptid; |
24a09b5f | 288 | unsigned long new_pid; |
836acd6d | 289 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 290 | |
bd99dc85 | 291 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
292 | |
293 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
294 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
295 | { | |
296 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
297 | hits the SIGSTOP, but we're already attached. */ | |
298 | ||
97438e3f | 299 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
300 | |
301 | if (ret == -1) | |
302 | perror_with_name ("waiting for new child"); | |
303 | else if (ret != new_pid) | |
304 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 305 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
306 | warning ("wait returned unexpected status 0x%x", status); |
307 | } | |
308 | ||
309 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE); | |
310 | ||
95954743 PA |
311 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
312 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
313 | add_thread (ptid, new_lwp); | |
24a09b5f | 314 | |
e27d73f6 DE |
315 | /* Either we're going to immediately resume the new thread |
316 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
317 | thinks the thread is currently running, so set this first | |
318 | before calling linux_resume_one_lwp. */ | |
319 | new_lwp->stopped = 1; | |
320 | ||
da5898ce DJ |
321 | /* Normally we will get the pending SIGSTOP. But in some cases |
322 | we might get another signal delivered to the group first. | |
f21cc1a2 | 323 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
324 | if (WSTOPSIG (status) == SIGSTOP) |
325 | { | |
e27d73f6 DE |
326 | if (! stopping_threads) |
327 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); | |
da5898ce | 328 | } |
24a09b5f | 329 | else |
da5898ce | 330 | { |
54a0b537 | 331 | new_lwp->stop_expected = 1; |
da5898ce DJ |
332 | if (stopping_threads) |
333 | { | |
54a0b537 PA |
334 | new_lwp->status_pending_p = 1; |
335 | new_lwp->status_pending = status; | |
da5898ce DJ |
336 | } |
337 | else | |
338 | /* Pass the signal on. This is what GDB does - except | |
339 | shouldn't we really report it instead? */ | |
e27d73f6 | 340 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 341 | } |
24a09b5f DJ |
342 | |
343 | /* Always resume the current thread. If we are stopping | |
344 | threads, it will have a pending SIGSTOP; we may as well | |
345 | collect it now. */ | |
2acc282a | 346 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
347 | } |
348 | } | |
349 | ||
0d62e5e8 DJ |
350 | /* This function should only be called if the process got a SIGTRAP. |
351 | The SIGTRAP could mean several things. | |
352 | ||
353 | On i386, where decr_pc_after_break is non-zero: | |
354 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
355 | we will get only the one SIGTRAP (even if the instruction we | |
356 | stepped over was a breakpoint). The value of $eip will be the | |
357 | next instruction. | |
358 | If we continue the process using PTRACE_CONT, we will get a | |
359 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
360 | the instruction after the breakpoint (i.e. needs to be | |
361 | decremented). If we report the SIGTRAP to GDB, we must also | |
362 | report the undecremented PC. If we cancel the SIGTRAP, we | |
363 | must resume at the decremented PC. | |
364 | ||
365 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
366 | with hardware or kernel single-step: | |
367 | If we single-step over a breakpoint instruction, our PC will | |
368 | point at the following instruction. If we continue and hit a | |
369 | breakpoint instruction, our PC will point at the breakpoint | |
370 | instruction. */ | |
371 | ||
372 | static CORE_ADDR | |
373 | get_stop_pc (void) | |
374 | { | |
375 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
376 | ||
47c0c975 DE |
377 | if (! get_thread_lwp (current_inferior)->stepping) |
378 | stop_pc -= the_low_target.decr_pc_after_break; | |
379 | ||
380 | if (debug_threads) | |
381 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
382 | ||
383 | return stop_pc; | |
0d62e5e8 | 384 | } |
ce3a066d | 385 | |
0d62e5e8 | 386 | static void * |
95954743 | 387 | add_lwp (ptid_t ptid) |
611cb4a5 | 388 | { |
54a0b537 | 389 | struct lwp_info *lwp; |
0d62e5e8 | 390 | |
54a0b537 PA |
391 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
392 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 393 | |
95954743 | 394 | lwp->head.id = ptid; |
0d62e5e8 | 395 | |
aa5ca48f DE |
396 | if (the_low_target.new_thread != NULL) |
397 | lwp->arch_private = the_low_target.new_thread (); | |
398 | ||
54a0b537 | 399 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 400 | |
54a0b537 | 401 | return lwp; |
0d62e5e8 | 402 | } |
611cb4a5 | 403 | |
da6d8c04 DJ |
404 | /* Start an inferior process and returns its pid. |
405 | ALLARGS is a vector of program-name and args. */ | |
406 | ||
ce3a066d DJ |
407 | static int |
408 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 409 | { |
a6dbe5df | 410 | struct lwp_info *new_lwp; |
da6d8c04 | 411 | int pid; |
95954743 | 412 | ptid_t ptid; |
da6d8c04 | 413 | |
42c81e2a | 414 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
415 | pid = vfork (); |
416 | #else | |
da6d8c04 | 417 | pid = fork (); |
52fb6437 | 418 | #endif |
da6d8c04 DJ |
419 | if (pid < 0) |
420 | perror_with_name ("fork"); | |
421 | ||
422 | if (pid == 0) | |
423 | { | |
424 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
425 | ||
254787d4 | 426 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 427 | |
a9fa9f7d DJ |
428 | setpgid (0, 0); |
429 | ||
2b876972 DJ |
430 | execv (program, allargs); |
431 | if (errno == ENOENT) | |
432 | execvp (program, allargs); | |
da6d8c04 DJ |
433 | |
434 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 435 | strerror (errno)); |
da6d8c04 DJ |
436 | fflush (stderr); |
437 | _exit (0177); | |
438 | } | |
439 | ||
95954743 PA |
440 | linux_add_process (pid, 0); |
441 | ||
442 | ptid = ptid_build (pid, pid, 0); | |
443 | new_lwp = add_lwp (ptid); | |
444 | add_thread (ptid, new_lwp); | |
a6dbe5df | 445 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 446 | |
a9fa9f7d | 447 | return pid; |
da6d8c04 DJ |
448 | } |
449 | ||
450 | /* Attach to an inferior process. */ | |
451 | ||
95954743 PA |
452 | static void |
453 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 454 | { |
95954743 | 455 | ptid_t ptid; |
54a0b537 | 456 | struct lwp_info *new_lwp; |
611cb4a5 | 457 | |
95954743 | 458 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 459 | { |
95954743 | 460 | if (!initial) |
2d717e4f DJ |
461 | { |
462 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 463 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
464 | strerror (errno), errno); |
465 | fflush (stderr); | |
466 | return; | |
467 | } | |
468 | else | |
469 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 470 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 471 | strerror (errno), errno); |
da6d8c04 DJ |
472 | } |
473 | ||
95954743 PA |
474 | if (initial) |
475 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
476 | ptid = ptid_build (lwpid, lwpid, 0); | |
477 | else | |
478 | { | |
479 | /* Note that extracting the pid from the current inferior is | |
480 | safe, since we're always called in the context of the same | |
481 | process as this new thread. */ | |
482 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
483 | ptid = ptid_build (pid, lwpid, 0); | |
484 | } | |
24a09b5f | 485 | |
95954743 PA |
486 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
487 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 488 | |
a6dbe5df PA |
489 | /* We need to wait for SIGSTOP before being able to make the next |
490 | ptrace call on this LWP. */ | |
491 | new_lwp->must_set_ptrace_flags = 1; | |
492 | ||
0d62e5e8 | 493 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
494 | brings it to a halt. |
495 | ||
496 | There are several cases to consider here: | |
497 | ||
498 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 PA |
499 | of a new thread that is being created. |
500 | In this case we should ignore that SIGSTOP and resume the process. | |
501 | This is handled below by setting stop_expected = 1. | |
0e21c1ec DE |
502 | |
503 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
504 | to it via attach_inferior. |
505 | In this case we want the process thread to stop. | |
506 | This is handled by having linux_attach clear stop_expected after | |
507 | we return. | |
508 | ??? If the process already has several threads we leave the other | |
509 | threads running. | |
0e21c1ec DE |
510 | |
511 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
512 | existing threads. |
513 | In this case we want the thread to stop. | |
514 | FIXME: This case is currently not properly handled. | |
515 | We should wait for the SIGSTOP but don't. Things work apparently | |
516 | because enough time passes between when we ptrace (ATTACH) and when | |
517 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
518 | |
519 | On the other hand, if we are currently trying to stop all threads, we | |
520 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 521 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
522 | end of the list, and so the new thread has not yet reached |
523 | wait_for_sigstop (but will). */ | |
0d62e5e8 | 524 | if (! stopping_threads) |
54a0b537 | 525 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
526 | } |
527 | ||
95954743 PA |
528 | void |
529 | linux_attach_lwp (unsigned long lwpid) | |
530 | { | |
531 | linux_attach_lwp_1 (lwpid, 0); | |
532 | } | |
533 | ||
0d62e5e8 | 534 | int |
a1928bad | 535 | linux_attach (unsigned long pid) |
0d62e5e8 | 536 | { |
54a0b537 | 537 | struct lwp_info *lwp; |
0d62e5e8 | 538 | |
95954743 PA |
539 | linux_attach_lwp_1 (pid, 1); |
540 | ||
541 | linux_add_process (pid, 1); | |
0d62e5e8 | 542 | |
bd99dc85 PA |
543 | if (!non_stop) |
544 | { | |
545 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
546 | process. It will be collected by wait shortly. */ | |
95954743 PA |
547 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
548 | ptid_build (pid, pid, 0)); | |
bd99dc85 PA |
549 | lwp->stop_expected = 0; |
550 | } | |
0d62e5e8 | 551 | |
95954743 PA |
552 | return 0; |
553 | } | |
554 | ||
555 | struct counter | |
556 | { | |
557 | int pid; | |
558 | int count; | |
559 | }; | |
560 | ||
561 | static int | |
562 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
563 | { | |
564 | struct counter *counter = args; | |
565 | ||
566 | if (ptid_get_pid (entry->id) == counter->pid) | |
567 | { | |
568 | if (++counter->count > 1) | |
569 | return 1; | |
570 | } | |
d61ddec4 | 571 | |
da6d8c04 DJ |
572 | return 0; |
573 | } | |
574 | ||
95954743 PA |
575 | static int |
576 | last_thread_of_process_p (struct thread_info *thread) | |
577 | { | |
578 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
579 | int pid = ptid_get_pid (ptid); | |
580 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 581 | |
95954743 PA |
582 | return (find_inferior (&all_threads, |
583 | second_thread_of_pid_p, &counter) == NULL); | |
584 | } | |
585 | ||
586 | /* Kill the inferior lwp. */ | |
587 | ||
588 | static int | |
589 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 590 | { |
0d62e5e8 | 591 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 592 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 593 | int wstat; |
95954743 PA |
594 | int pid = * (int *) args; |
595 | ||
596 | if (ptid_get_pid (entry->id) != pid) | |
597 | return 0; | |
0d62e5e8 | 598 | |
fd500816 DJ |
599 | /* We avoid killing the first thread here, because of a Linux kernel (at |
600 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
601 | the children get a chance to be reaped, it will remain a zombie | |
602 | forever. */ | |
95954743 | 603 | |
12b42a12 | 604 | if (lwpid_of (lwp) == pid) |
95954743 PA |
605 | { |
606 | if (debug_threads) | |
607 | fprintf (stderr, "lkop: is last of process %s\n", | |
608 | target_pid_to_str (entry->id)); | |
609 | return 0; | |
610 | } | |
fd500816 | 611 | |
bd99dc85 PA |
612 | /* If we're killing a running inferior, make sure it is stopped |
613 | first, as PTRACE_KILL will not work otherwise. */ | |
614 | if (!lwp->stopped) | |
615 | send_sigstop (&lwp->head); | |
616 | ||
0d62e5e8 DJ |
617 | do |
618 | { | |
bd99dc85 | 619 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
620 | |
621 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 622 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 623 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
624 | |
625 | return 0; | |
da6d8c04 DJ |
626 | } |
627 | ||
95954743 PA |
628 | static int |
629 | linux_kill (int pid) | |
0d62e5e8 | 630 | { |
95954743 | 631 | struct process_info *process; |
54a0b537 | 632 | struct lwp_info *lwp; |
95954743 | 633 | struct thread_info *thread; |
fd500816 | 634 | int wstat; |
95954743 | 635 | int lwpid; |
fd500816 | 636 | |
95954743 PA |
637 | process = find_process_pid (pid); |
638 | if (process == NULL) | |
639 | return -1; | |
9d606399 | 640 | |
95954743 | 641 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 642 | |
54a0b537 | 643 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 644 | thread in the list, so do so now. */ |
95954743 PA |
645 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
646 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
647 | |
648 | if (debug_threads) | |
95954743 PA |
649 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
650 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
651 | |
652 | /* If we're killing a running inferior, make sure it is stopped | |
653 | first, as PTRACE_KILL will not work otherwise. */ | |
654 | if (!lwp->stopped) | |
655 | send_sigstop (&lwp->head); | |
656 | ||
fd500816 DJ |
657 | do |
658 | { | |
bd99dc85 | 659 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
660 | |
661 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
662 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
663 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 664 | |
bd99dc85 | 665 | delete_lwp (lwp); |
5091eb23 | 666 | linux_remove_process (process); |
95954743 | 667 | return 0; |
0d62e5e8 DJ |
668 | } |
669 | ||
95954743 PA |
670 | static int |
671 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
672 | { |
673 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 674 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
675 | int pid = * (int *) args; |
676 | ||
677 | if (ptid_get_pid (entry->id) != pid) | |
678 | return 0; | |
6ad8ae5c | 679 | |
bd99dc85 PA |
680 | /* If we're detaching from a running inferior, make sure it is |
681 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
682 | if (!lwp->stopped) | |
683 | { | |
95954743 | 684 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
685 | |
686 | stopping_threads = 1; | |
687 | send_sigstop (&lwp->head); | |
688 | ||
689 | /* If this detects a new thread through a clone event, the new | |
690 | thread is appended to the end of the lwp list, so we'll | |
691 | eventually detach from it. */ | |
692 | wait_for_sigstop (&lwp->head); | |
693 | stopping_threads = 0; | |
694 | ||
695 | /* If LWP exits while we're trying to stop it, there's nothing | |
696 | left to do. */ | |
95954743 | 697 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 698 | if (lwp == NULL) |
95954743 | 699 | return 0; |
bd99dc85 PA |
700 | } |
701 | ||
ae13219e DJ |
702 | /* Make sure the process isn't stopped at a breakpoint that's |
703 | no longer there. */ | |
54a0b537 | 704 | check_removed_breakpoint (lwp); |
ae13219e DJ |
705 | |
706 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
707 | sure we take care of that now. This isn't absolutely guaranteed | |
708 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 709 | if (lwp->stop_expected) |
ae13219e | 710 | { |
bd99dc85 | 711 | int wstat; |
ae13219e | 712 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
713 | lwp->stop_expected = 0; |
714 | if (lwp->stopped) | |
2acc282a | 715 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 716 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
717 | } |
718 | ||
719 | /* Flush any pending changes to the process's registers. */ | |
720 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 721 | get_lwp_thread (lwp)); |
ae13219e DJ |
722 | |
723 | /* Finally, let it resume. */ | |
bd99dc85 PA |
724 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
725 | ||
726 | delete_lwp (lwp); | |
95954743 | 727 | return 0; |
6ad8ae5c DJ |
728 | } |
729 | ||
dd6953e1 | 730 | static int |
95954743 | 731 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 732 | { |
95954743 PA |
733 | int *pid_p = args; |
734 | ||
735 | if (ptid_get_pid (entry->id) == *pid_p) | |
736 | return 1; | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
741 | static int | |
742 | linux_detach (int pid) | |
743 | { | |
744 | struct process_info *process; | |
745 | ||
746 | process = find_process_pid (pid); | |
747 | if (process == NULL) | |
748 | return -1; | |
749 | ||
750 | current_inferior = | |
751 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
752 | ||
ae13219e | 753 | delete_all_breakpoints (); |
95954743 | 754 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
5091eb23 | 755 | linux_remove_process (process); |
dd6953e1 | 756 | return 0; |
6ad8ae5c DJ |
757 | } |
758 | ||
444d6139 | 759 | static void |
95954743 | 760 | linux_join (int pid) |
444d6139 | 761 | { |
444d6139 | 762 | int status, ret; |
95954743 | 763 | struct process_info *process; |
bd99dc85 | 764 | |
95954743 PA |
765 | process = find_process_pid (pid); |
766 | if (process == NULL) | |
767 | return; | |
444d6139 PA |
768 | |
769 | do { | |
95954743 | 770 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
771 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
772 | break; | |
773 | } while (ret != -1 || errno != ECHILD); | |
774 | } | |
775 | ||
6ad8ae5c | 776 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 777 | static int |
95954743 | 778 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 779 | { |
95954743 PA |
780 | struct lwp_info *lwp = find_lwp_pid (ptid); |
781 | ||
782 | /* We assume we always know if a thread exits. If a whole process | |
783 | exited but we still haven't been able to report it to GDB, we'll | |
784 | hold on to the last lwp of the dead process. */ | |
785 | if (lwp != NULL) | |
786 | return !lwp->dead; | |
0d62e5e8 DJ |
787 | else |
788 | return 0; | |
789 | } | |
790 | ||
791 | /* Return nonzero if this process stopped at a breakpoint which | |
792 | no longer appears to be inserted. Also adjust the PC | |
793 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 794 | static int |
54a0b537 | 795 | check_removed_breakpoint (struct lwp_info *event_child) |
da6d8c04 | 796 | { |
0d62e5e8 DJ |
797 | CORE_ADDR stop_pc; |
798 | struct thread_info *saved_inferior; | |
799 | ||
800 | if (event_child->pending_is_breakpoint == 0) | |
801 | return 0; | |
802 | ||
803 | if (debug_threads) | |
54a0b537 | 804 | fprintf (stderr, "Checking for breakpoint in lwp %ld.\n", |
bd99dc85 | 805 | lwpid_of (event_child)); |
0d62e5e8 DJ |
806 | |
807 | saved_inferior = current_inferior; | |
54a0b537 | 808 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 DJ |
809 | |
810 | stop_pc = get_stop_pc (); | |
811 | ||
812 | /* If the PC has changed since we stopped, then we shouldn't do | |
813 | anything. This happens if, for instance, GDB handled the | |
814 | decr_pc_after_break subtraction itself. */ | |
815 | if (stop_pc != event_child->pending_stop_pc) | |
816 | { | |
817 | if (debug_threads) | |
ae13219e DJ |
818 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
819 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
820 | |
821 | event_child->pending_is_breakpoint = 0; | |
822 | current_inferior = saved_inferior; | |
823 | return 0; | |
824 | } | |
825 | ||
826 | /* If the breakpoint is still there, we will report hitting it. */ | |
827 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
828 | { | |
829 | if (debug_threads) | |
830 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
831 | current_inferior = saved_inferior; | |
832 | return 0; | |
833 | } | |
834 | ||
835 | if (debug_threads) | |
836 | fprintf (stderr, "Removed breakpoint.\n"); | |
837 | ||
838 | /* For decr_pc_after_break targets, here is where we perform the | |
839 | decrement. We go immediately from this function to resuming, | |
840 | and can not safely call get_stop_pc () again. */ | |
841 | if (the_low_target.set_pc != NULL) | |
47c0c975 DE |
842 | { |
843 | if (debug_threads) | |
844 | fprintf (stderr, "Set pc to 0x%lx\n", (long) stop_pc); | |
845 | (*the_low_target.set_pc) (stop_pc); | |
846 | } | |
0d62e5e8 DJ |
847 | |
848 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 849 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
850 | event_child->status_pending_p = 0; |
851 | event_child->status_pending = 0; | |
852 | ||
853 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
854 | return 1; |
855 | } | |
856 | ||
54a0b537 PA |
857 | /* Return 1 if this lwp has an interesting status pending. This |
858 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 859 | static int |
95954743 | 860 | status_pending_p (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 861 | { |
54a0b537 | 862 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 PA |
863 | ptid_t ptid = * (ptid_t *) arg; |
864 | ||
865 | /* Check if we're only interested in events from a specific process | |
866 | or its lwps. */ | |
867 | if (!ptid_equal (minus_one_ptid, ptid) | |
868 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
869 | return 0; | |
0d62e5e8 | 870 | |
bd99dc85 | 871 | if (lwp->status_pending_p && !lwp->suspended) |
54a0b537 | 872 | if (check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
873 | { |
874 | /* This thread was stopped at a breakpoint, and the breakpoint | |
875 | is now gone. We were told to continue (or step...) all threads, | |
876 | so GDB isn't trying to single-step past this breakpoint. | |
877 | So instead of reporting the old SIGTRAP, pretend we got to | |
878 | the breakpoint just after it was removed instead of just | |
879 | before; resume the process. */ | |
2acc282a | 880 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
0d62e5e8 DJ |
881 | return 0; |
882 | } | |
883 | ||
bd99dc85 | 884 | return (lwp->status_pending_p && !lwp->suspended); |
0d62e5e8 DJ |
885 | } |
886 | ||
95954743 PA |
887 | static int |
888 | same_lwp (struct inferior_list_entry *entry, void *data) | |
889 | { | |
890 | ptid_t ptid = *(ptid_t *) data; | |
891 | int lwp; | |
892 | ||
893 | if (ptid_get_lwp (ptid) != 0) | |
894 | lwp = ptid_get_lwp (ptid); | |
895 | else | |
896 | lwp = ptid_get_pid (ptid); | |
897 | ||
898 | if (ptid_get_lwp (entry->id) == lwp) | |
899 | return 1; | |
900 | ||
901 | return 0; | |
902 | } | |
903 | ||
904 | struct lwp_info * | |
905 | find_lwp_pid (ptid_t ptid) | |
906 | { | |
907 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
908 | } | |
909 | ||
bd99dc85 | 910 | static struct lwp_info * |
95954743 | 911 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 912 | { |
0d62e5e8 | 913 | int ret; |
95954743 | 914 | int to_wait_for = -1; |
bd99dc85 | 915 | struct lwp_info *child = NULL; |
0d62e5e8 | 916 | |
bd99dc85 | 917 | if (debug_threads) |
95954743 PA |
918 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
919 | ||
920 | if (ptid_equal (ptid, minus_one_ptid)) | |
921 | to_wait_for = -1; /* any child */ | |
922 | else | |
923 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 924 | |
bd99dc85 | 925 | options |= __WALL; |
0d62e5e8 | 926 | |
bd99dc85 | 927 | retry: |
0d62e5e8 | 928 | |
bd99dc85 PA |
929 | ret = my_waitpid (to_wait_for, wstatp, options); |
930 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
931 | return NULL; | |
932 | else if (ret == -1) | |
933 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
934 | |
935 | if (debug_threads | |
936 | && (!WIFSTOPPED (*wstatp) | |
937 | || (WSTOPSIG (*wstatp) != 32 | |
938 | && WSTOPSIG (*wstatp) != 33))) | |
939 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
940 | ||
95954743 | 941 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 942 | |
24a09b5f DJ |
943 | /* If we didn't find a process, one of two things presumably happened: |
944 | - A process we started and then detached from has exited. Ignore it. | |
945 | - A process we are controlling has forked and the new child's stop | |
946 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 947 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
948 | { |
949 | add_pid_to_list (&stopped_pids, ret); | |
950 | goto retry; | |
951 | } | |
bd99dc85 | 952 | else if (child == NULL) |
24a09b5f DJ |
953 | goto retry; |
954 | ||
bd99dc85 PA |
955 | child->stopped = 1; |
956 | child->pending_is_breakpoint = 0; | |
0d62e5e8 | 957 | |
bd99dc85 | 958 | child->last_status = *wstatp; |
32ca6d61 | 959 | |
d61ddec4 UW |
960 | /* Architecture-specific setup after inferior is running. |
961 | This needs to happen after we have attached to the inferior | |
962 | and it is stopped for the first time, but before we access | |
963 | any inferior registers. */ | |
964 | if (new_inferior) | |
965 | { | |
966 | the_low_target.arch_setup (); | |
52fa2412 UW |
967 | #ifdef HAVE_LINUX_REGSETS |
968 | memset (disabled_regsets, 0, num_regsets); | |
969 | #endif | |
d61ddec4 UW |
970 | new_inferior = 0; |
971 | } | |
972 | ||
0d62e5e8 | 973 | if (debug_threads |
47c0c975 DE |
974 | && WIFSTOPPED (*wstatp) |
975 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 976 | { |
896c7fbb | 977 | struct thread_info *saved_inferior = current_inferior; |
47c0c975 DE |
978 | CORE_ADDR pc; |
979 | ||
0d62e5e8 | 980 | current_inferior = (struct thread_info *) |
95954743 | 981 | find_inferior_id (&all_threads, child->head.id); |
47c0c975 DE |
982 | pc = (*the_low_target.get_pc) (); |
983 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); | |
896c7fbb | 984 | current_inferior = saved_inferior; |
0d62e5e8 | 985 | } |
bd99dc85 PA |
986 | |
987 | return child; | |
0d62e5e8 | 988 | } |
611cb4a5 | 989 | |
bd99dc85 PA |
990 | /* Wait for an event from child PID. If PID is -1, wait for any |
991 | child. Store the stop status through the status pointer WSTAT. | |
992 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
993 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
994 | the stopped child otherwise. */ | |
995 | ||
0d62e5e8 | 996 | static int |
95954743 | 997 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 DJ |
998 | { |
999 | CORE_ADDR stop_pc; | |
bd99dc85 | 1000 | struct lwp_info *event_child = NULL; |
b65d95c5 | 1001 | int bp_status; |
bd99dc85 | 1002 | struct lwp_info *requested_child = NULL; |
0d62e5e8 | 1003 | |
95954743 | 1004 | /* Check for a lwp with a pending status. */ |
0d62e5e8 DJ |
1005 | /* It is possible that the user changed the pending task's registers since |
1006 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 1007 | (in check_removed_breakpoint); signals should be reported anyway. */ |
bd99dc85 | 1008 | |
95954743 PA |
1009 | if (ptid_equal (ptid, minus_one_ptid) |
1010 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1011 | { |
54a0b537 | 1012 | event_child = (struct lwp_info *) |
95954743 | 1013 | find_inferior (&all_lwps, status_pending_p, &ptid); |
0d62e5e8 | 1014 | if (debug_threads && event_child) |
bd99dc85 | 1015 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1016 | } |
1017 | else | |
1018 | { | |
95954743 | 1019 | requested_child = find_lwp_pid (ptid); |
bd99dc85 PA |
1020 | if (requested_child->status_pending_p |
1021 | && !check_removed_breakpoint (requested_child)) | |
1022 | event_child = requested_child; | |
0d62e5e8 | 1023 | } |
611cb4a5 | 1024 | |
0d62e5e8 DJ |
1025 | if (event_child != NULL) |
1026 | { | |
bd99dc85 PA |
1027 | if (debug_threads) |
1028 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1029 | lwpid_of (event_child), event_child->status_pending); | |
1030 | *wstat = event_child->status_pending; | |
1031 | event_child->status_pending_p = 0; | |
1032 | event_child->status_pending = 0; | |
1033 | current_inferior = get_lwp_thread (event_child); | |
1034 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1035 | } |
1036 | ||
1037 | /* We only enter this loop if no process has a pending wait status. Thus | |
1038 | any action taken in response to a wait status inside this loop is | |
1039 | responding as soon as we detect the status, not after any pending | |
1040 | events. */ | |
1041 | while (1) | |
1042 | { | |
95954743 | 1043 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1044 | |
bd99dc85 PA |
1045 | if ((options & WNOHANG) && event_child == NULL) |
1046 | return 0; | |
0d62e5e8 DJ |
1047 | |
1048 | if (event_child == NULL) | |
1049 | error ("event from unknown child"); | |
611cb4a5 | 1050 | |
bd99dc85 | 1051 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1052 | |
89be2091 | 1053 | /* Check for thread exit. */ |
bd99dc85 | 1054 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1055 | { |
89be2091 | 1056 | if (debug_threads) |
95954743 | 1057 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1058 | |
1059 | /* If the last thread is exiting, just return. */ | |
95954743 | 1060 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1061 | { |
1062 | if (debug_threads) | |
95954743 PA |
1063 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1064 | lwpid_of (event_child)); | |
bd99dc85 PA |
1065 | return lwpid_of (event_child); |
1066 | } | |
89be2091 | 1067 | |
bd99dc85 | 1068 | delete_lwp (event_child); |
89be2091 | 1069 | |
bd99dc85 PA |
1070 | if (!non_stop) |
1071 | { | |
1072 | current_inferior = (struct thread_info *) all_threads.head; | |
1073 | if (debug_threads) | |
1074 | fprintf (stderr, "Current inferior is now %ld\n", | |
1075 | lwpid_of (get_thread_lwp (current_inferior))); | |
1076 | } | |
1077 | else | |
1078 | { | |
1079 | current_inferior = NULL; | |
1080 | if (debug_threads) | |
1081 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1082 | } | |
89be2091 DJ |
1083 | |
1084 | /* If we were waiting for this particular child to do something... | |
1085 | well, it did something. */ | |
bd99dc85 | 1086 | if (requested_child != NULL) |
95954743 | 1087 | return lwpid_of (event_child); |
89be2091 DJ |
1088 | |
1089 | /* Wait for a more interesting event. */ | |
1090 | continue; | |
1091 | } | |
1092 | ||
a6dbe5df PA |
1093 | if (event_child->must_set_ptrace_flags) |
1094 | { | |
1095 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
1096 | 0, PTRACE_O_TRACECLONE); | |
1097 | event_child->must_set_ptrace_flags = 0; | |
1098 | } | |
1099 | ||
bd99dc85 PA |
1100 | if (WIFSTOPPED (*wstat) |
1101 | && WSTOPSIG (*wstat) == SIGSTOP | |
89be2091 DJ |
1102 | && event_child->stop_expected) |
1103 | { | |
1104 | if (debug_threads) | |
1105 | fprintf (stderr, "Expected stop.\n"); | |
1106 | event_child->stop_expected = 0; | |
2acc282a | 1107 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
89be2091 DJ |
1108 | continue; |
1109 | } | |
1110 | ||
bd99dc85 PA |
1111 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1112 | && *wstat >> 16 != 0) | |
24a09b5f | 1113 | { |
bd99dc85 | 1114 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1115 | continue; |
1116 | } | |
1117 | ||
89be2091 DJ |
1118 | /* If GDB is not interested in this signal, don't stop other |
1119 | threads, and don't report it to GDB. Just resume the | |
1120 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1121 | signals as well as any that GDB specifically requested we |
1122 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1123 | and do not ignore signals when stepping - they may require | |
1124 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1125 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1126 | thread library? */ | |
bd99dc85 | 1127 | if (WIFSTOPPED (*wstat) |
69f223ed | 1128 | && !event_child->stepping |
24a09b5f DJ |
1129 | && ( |
1130 | #ifdef USE_THREAD_DB | |
cdbfd419 | 1131 | (current_process ()->private->thread_db != NULL |
bd99dc85 PA |
1132 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1133 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1134 | || |
1135 | #endif | |
bd99dc85 PA |
1136 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
1137 | && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
1138 | { |
1139 | siginfo_t info, *info_p; | |
1140 | ||
1141 | if (debug_threads) | |
24a09b5f | 1142 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1143 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1144 | |
bd99dc85 | 1145 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1146 | info_p = &info; |
1147 | else | |
1148 | info_p = NULL; | |
2acc282a | 1149 | linux_resume_one_lwp (event_child, |
54a0b537 | 1150 | event_child->stepping, |
bd99dc85 | 1151 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1152 | continue; |
0d62e5e8 | 1153 | } |
611cb4a5 | 1154 | |
0d62e5e8 DJ |
1155 | /* If this event was not handled above, and is not a SIGTRAP, report |
1156 | it. */ | |
bd99dc85 PA |
1157 | if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP) |
1158 | return lwpid_of (event_child); | |
611cb4a5 | 1159 | |
0d62e5e8 DJ |
1160 | /* If this target does not support breakpoints, we simply report the |
1161 | SIGTRAP; it's of no concern to us. */ | |
1162 | if (the_low_target.get_pc == NULL) | |
bd99dc85 | 1163 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1164 | |
1165 | stop_pc = get_stop_pc (); | |
1166 | ||
1167 | /* bp_reinsert will only be set if we were single-stepping. | |
1168 | Notice that we will resume the process after hitting | |
1169 | a gdbserver breakpoint; single-stepping to/over one | |
1170 | is not supported (yet). */ | |
1171 | if (event_child->bp_reinsert != 0) | |
1172 | { | |
1173 | if (debug_threads) | |
1174 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
1175 | reinsert_breakpoint (event_child->bp_reinsert); | |
1176 | event_child->bp_reinsert = 0; | |
1177 | ||
1178 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
2acc282a | 1179 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
0d62e5e8 DJ |
1180 | continue; |
1181 | } | |
1182 | ||
b65d95c5 | 1183 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 1184 | |
b65d95c5 | 1185 | if (bp_status != 0) |
0d62e5e8 | 1186 | { |
b65d95c5 DJ |
1187 | if (debug_threads) |
1188 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1189 | ||
0d62e5e8 | 1190 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 1191 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
1192 | adjustment for us at the appropriate time. */ |
1193 | event_child->pending_is_breakpoint = 1; | |
1194 | event_child->pending_stop_pc = stop_pc; | |
1195 | ||
b65d95c5 | 1196 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
1197 | loop instead of simply replacing the breakpoint right away, |
1198 | in order to not lose signals sent to the thread that hit the | |
1199 | breakpoint. Unfortunately this increases the window where another | |
1200 | thread could sneak past the removed breakpoint. For the current | |
1201 | use of server-side breakpoints (thread creation) this is | |
1202 | acceptable; but it needs to be considered before this breakpoint | |
1203 | mechanism can be used in more general ways. For some breakpoints | |
1204 | it may be necessary to stop all other threads, but that should | |
1205 | be avoided where possible. | |
1206 | ||
1207 | If breakpoint_reinsert_addr is NULL, that means that we can | |
1208 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
1209 | mark it for reinsertion, and single-step. | |
1210 | ||
1211 | Otherwise, call the target function to figure out where we need | |
1212 | our temporary breakpoint, create it, and continue executing this | |
1213 | process. */ | |
bd99dc85 PA |
1214 | |
1215 | /* NOTE: we're lifting breakpoints in non-stop mode. This | |
1216 | is currently only used for thread event breakpoints, so | |
1217 | it isn't that bad as long as we have PTRACE_EVENT_CLONE | |
1218 | events. */ | |
b65d95c5 DJ |
1219 | if (bp_status == 2) |
1220 | /* No need to reinsert. */ | |
2acc282a | 1221 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
b65d95c5 | 1222 | else if (the_low_target.breakpoint_reinsert_addr == NULL) |
0d62e5e8 DJ |
1223 | { |
1224 | event_child->bp_reinsert = stop_pc; | |
1225 | uninsert_breakpoint (stop_pc); | |
2acc282a | 1226 | linux_resume_one_lwp (event_child, 1, 0, NULL); |
0d62e5e8 DJ |
1227 | } |
1228 | else | |
1229 | { | |
1230 | reinsert_breakpoint_by_bp | |
1231 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
2acc282a | 1232 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
611cb4a5 | 1233 | } |
0d62e5e8 DJ |
1234 | |
1235 | continue; | |
1236 | } | |
1237 | ||
b65d95c5 DJ |
1238 | if (debug_threads) |
1239 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
1240 | ||
0d62e5e8 | 1241 | /* If we were single-stepping, we definitely want to report the |
c35fafde PA |
1242 | SIGTRAP. Although the single-step operation has completed, |
1243 | do not clear clear the stepping flag yet; we need to check it | |
1244 | in wait_for_sigstop. */ | |
0d62e5e8 | 1245 | if (event_child->stepping) |
bd99dc85 | 1246 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1247 | |
1248 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
1249 | Check if it is a breakpoint, and if so mark the process information | |
1250 | accordingly. This will handle both the necessary fiddling with the | |
1251 | PC on decr_pc_after_break targets and suppressing extra threads | |
1252 | hitting a breakpoint if two hit it at once and then GDB removes it | |
1253 | after the first is reported. Arguably it would be better to report | |
1254 | multiple threads hitting breakpoints simultaneously, but the current | |
1255 | remote protocol does not allow this. */ | |
1256 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
1257 | { | |
1258 | event_child->pending_is_breakpoint = 1; | |
1259 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
1260 | } |
1261 | ||
bd99dc85 | 1262 | return lwpid_of (event_child); |
611cb4a5 | 1263 | } |
0d62e5e8 | 1264 | |
611cb4a5 DJ |
1265 | /* NOTREACHED */ |
1266 | return 0; | |
1267 | } | |
1268 | ||
95954743 PA |
1269 | static int |
1270 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1271 | { | |
1272 | ptid_t wait_ptid; | |
1273 | ||
1274 | if (ptid_is_pid (ptid)) | |
1275 | { | |
1276 | /* A request to wait for a specific tgid. This is not possible | |
1277 | with waitpid, so instead, we wait for any child, and leave | |
1278 | children we're not interested in right now with a pending | |
1279 | status to report later. */ | |
1280 | wait_ptid = minus_one_ptid; | |
1281 | } | |
1282 | else | |
1283 | wait_ptid = ptid; | |
1284 | ||
1285 | while (1) | |
1286 | { | |
1287 | int event_pid; | |
1288 | ||
1289 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1290 | ||
1291 | if (event_pid > 0 | |
1292 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1293 | { | |
1294 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1295 | ||
1296 | if (! WIFSTOPPED (*wstat)) | |
1297 | mark_lwp_dead (event_child, *wstat); | |
1298 | else | |
1299 | { | |
1300 | event_child->status_pending_p = 1; | |
1301 | event_child->status_pending = *wstat; | |
1302 | } | |
1303 | } | |
1304 | else | |
1305 | return event_pid; | |
1306 | } | |
1307 | } | |
1308 | ||
0d62e5e8 | 1309 | /* Wait for process, returns status. */ |
da6d8c04 | 1310 | |
95954743 PA |
1311 | static ptid_t |
1312 | linux_wait_1 (ptid_t ptid, | |
1313 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1314 | { |
e5f1222d | 1315 | int w; |
bd99dc85 PA |
1316 | struct thread_info *thread = NULL; |
1317 | struct lwp_info *lwp = NULL; | |
1318 | int options; | |
bd99dc85 PA |
1319 | int pid; |
1320 | ||
1321 | /* Translate generic target options into linux options. */ | |
1322 | options = __WALL; | |
1323 | if (target_options & TARGET_WNOHANG) | |
1324 | options |= WNOHANG; | |
0d62e5e8 DJ |
1325 | |
1326 | retry: | |
bd99dc85 PA |
1327 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1328 | ||
0d62e5e8 DJ |
1329 | /* If we were only supposed to resume one thread, only wait for |
1330 | that thread - if it's still alive. If it died, however - which | |
1331 | can happen if we're coming from the thread death case below - | |
1332 | then we need to make sure we restart the other threads. We could | |
1333 | pick a thread at random or restart all; restarting all is less | |
1334 | arbitrary. */ | |
95954743 PA |
1335 | if (!non_stop |
1336 | && !ptid_equal (cont_thread, null_ptid) | |
1337 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1338 | { |
bd99dc85 PA |
1339 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1340 | cont_thread); | |
0d62e5e8 DJ |
1341 | |
1342 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1343 | if (thread == NULL) |
64386c31 DJ |
1344 | { |
1345 | struct thread_resume resume_info; | |
95954743 | 1346 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1347 | resume_info.kind = resume_continue; |
1348 | resume_info.sig = 0; | |
2bd7c093 | 1349 | linux_resume (&resume_info, 1); |
64386c31 | 1350 | } |
bd99dc85 | 1351 | else |
95954743 | 1352 | ptid = cont_thread; |
0d62e5e8 | 1353 | } |
da6d8c04 | 1354 | |
95954743 | 1355 | pid = linux_wait_for_event (ptid, &w, options); |
bd99dc85 | 1356 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1357 | return null_ptid; |
bd99dc85 PA |
1358 | |
1359 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1360 | |
0d62e5e8 DJ |
1361 | /* If we are waiting for a particular child, and it exited, |
1362 | linux_wait_for_event will return its exit status. Similarly if | |
1363 | the last child exited. If this is not the last child, however, | |
1364 | do not report it as exited until there is a 'thread exited' response | |
1365 | available in the remote protocol. Instead, just wait for another event. | |
1366 | This should be safe, because if the thread crashed we will already | |
1367 | have reported the termination signal to GDB; that should stop any | |
1368 | in-progress stepping operations, etc. | |
1369 | ||
1370 | Report the exit status of the last thread to exit. This matches | |
1371 | LinuxThreads' behavior. */ | |
1372 | ||
95954743 | 1373 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1374 | { |
bd99dc85 | 1375 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1376 | { |
95954743 PA |
1377 | int pid = pid_of (lwp); |
1378 | struct process_info *process = find_process_pid (pid); | |
5b1c542e | 1379 | |
bd99dc85 | 1380 | delete_lwp (lwp); |
5091eb23 | 1381 | linux_remove_process (process); |
5b1c542e | 1382 | |
bd99dc85 | 1383 | current_inferior = NULL; |
5b1c542e | 1384 | |
bd99dc85 PA |
1385 | if (WIFEXITED (w)) |
1386 | { | |
1387 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1388 | ourstatus->value.integer = WEXITSTATUS (w); | |
1389 | ||
1390 | if (debug_threads) | |
1391 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1392 | } | |
1393 | else | |
1394 | { | |
1395 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1396 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1397 | ||
1398 | if (debug_threads) | |
1399 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1400 | ||
1401 | } | |
5b1c542e | 1402 | |
95954743 | 1403 | return pid_to_ptid (pid); |
0d62e5e8 | 1404 | } |
da6d8c04 | 1405 | } |
0d62e5e8 | 1406 | else |
da6d8c04 | 1407 | { |
0d62e5e8 DJ |
1408 | if (!WIFSTOPPED (w)) |
1409 | goto retry; | |
da6d8c04 DJ |
1410 | } |
1411 | ||
bd99dc85 PA |
1412 | /* In all-stop, stop all threads. Be careful to only do this if |
1413 | we're about to report an event to GDB. */ | |
1414 | if (!non_stop) | |
1415 | stop_all_lwps (); | |
1416 | ||
5b1c542e | 1417 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1418 | |
bd99dc85 PA |
1419 | if (lwp->suspended && WSTOPSIG (w) == SIGSTOP) |
1420 | { | |
1421 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1422 | and it stopped cleanly, so report as SIG0. The use of | |
1423 | SIGSTOP is an implementation detail. */ | |
1424 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1425 | } | |
1426 | else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP) | |
1427 | { | |
1428 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1429 | but, it stopped for other reasons. Set stop_expected so the | |
1430 | pending SIGSTOP is ignored and the LWP is resumed. */ | |
1431 | lwp->stop_expected = 1; | |
1432 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1433 | } | |
1434 | else | |
1435 | { | |
1436 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1437 | } | |
1438 | ||
1439 | if (debug_threads) | |
95954743 PA |
1440 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
1441 | target_pid_to_str (lwp->head.id), | |
bd99dc85 PA |
1442 | ourstatus->kind, |
1443 | ourstatus->value.sig); | |
1444 | ||
95954743 | 1445 | return lwp->head.id; |
bd99dc85 PA |
1446 | } |
1447 | ||
1448 | /* Get rid of any pending event in the pipe. */ | |
1449 | static void | |
1450 | async_file_flush (void) | |
1451 | { | |
1452 | int ret; | |
1453 | char buf; | |
1454 | ||
1455 | do | |
1456 | ret = read (linux_event_pipe[0], &buf, 1); | |
1457 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1458 | } | |
1459 | ||
1460 | /* Put something in the pipe, so the event loop wakes up. */ | |
1461 | static void | |
1462 | async_file_mark (void) | |
1463 | { | |
1464 | int ret; | |
1465 | ||
1466 | async_file_flush (); | |
1467 | ||
1468 | do | |
1469 | ret = write (linux_event_pipe[1], "+", 1); | |
1470 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1471 | ||
1472 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1473 | be awakened anyway. */ | |
1474 | } | |
1475 | ||
95954743 PA |
1476 | static ptid_t |
1477 | linux_wait (ptid_t ptid, | |
1478 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1479 | { |
95954743 | 1480 | ptid_t event_ptid; |
bd99dc85 PA |
1481 | |
1482 | if (debug_threads) | |
95954743 | 1483 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1484 | |
1485 | /* Flush the async file first. */ | |
1486 | if (target_is_async_p ()) | |
1487 | async_file_flush (); | |
1488 | ||
95954743 | 1489 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1490 | |
1491 | /* If at least one stop was reported, there may be more. A single | |
1492 | SIGCHLD can signal more than one child stop. */ | |
1493 | if (target_is_async_p () | |
1494 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1495 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1496 | async_file_mark (); |
1497 | ||
1498 | return event_ptid; | |
da6d8c04 DJ |
1499 | } |
1500 | ||
fd500816 DJ |
1501 | /* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if |
1502 | thread groups are in use, we need to use tkill. */ | |
1503 | ||
1504 | static int | |
a1928bad | 1505 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 DJ |
1506 | { |
1507 | static int tkill_failed; | |
1508 | ||
1509 | errno = 0; | |
1510 | ||
1511 | #ifdef SYS_tkill | |
1512 | if (!tkill_failed) | |
1513 | { | |
1514 | int ret = syscall (SYS_tkill, lwpid, signo); | |
1515 | if (errno != ENOSYS) | |
1b3f6016 | 1516 | return ret; |
fd500816 DJ |
1517 | errno = 0; |
1518 | tkill_failed = 1; | |
1519 | } | |
1520 | #endif | |
1521 | ||
1522 | return kill (lwpid, signo); | |
1523 | } | |
1524 | ||
0d62e5e8 DJ |
1525 | static void |
1526 | send_sigstop (struct inferior_list_entry *entry) | |
1527 | { | |
54a0b537 | 1528 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1529 | int pid; |
0d62e5e8 | 1530 | |
54a0b537 | 1531 | if (lwp->stopped) |
0d62e5e8 DJ |
1532 | return; |
1533 | ||
bd99dc85 PA |
1534 | pid = lwpid_of (lwp); |
1535 | ||
0d62e5e8 DJ |
1536 | /* If we already have a pending stop signal for this process, don't |
1537 | send another. */ | |
54a0b537 | 1538 | if (lwp->stop_expected) |
0d62e5e8 | 1539 | { |
ae13219e | 1540 | if (debug_threads) |
bd99dc85 | 1541 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e DJ |
1542 | |
1543 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1544 | will receive the SIGSTOP event (instead of silently resuming and | |
1545 | waiting again). It'll be reset below. */ | |
54a0b537 | 1546 | lwp->stop_expected = 0; |
0d62e5e8 DJ |
1547 | return; |
1548 | } | |
1549 | ||
1550 | if (debug_threads) | |
bd99dc85 | 1551 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1552 | |
bd99dc85 | 1553 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1554 | } |
1555 | ||
95954743 PA |
1556 | static void |
1557 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
1558 | { | |
1559 | /* It's dead, really. */ | |
1560 | lwp->dead = 1; | |
1561 | ||
1562 | /* Store the exit status for later. */ | |
1563 | lwp->status_pending_p = 1; | |
1564 | lwp->status_pending = wstat; | |
1565 | ||
1566 | /* So that check_removed_breakpoint doesn't try to figure out if | |
1567 | this is stopped at a breakpoint. */ | |
1568 | lwp->pending_is_breakpoint = 0; | |
1569 | ||
1570 | /* Prevent trying to stop it. */ | |
1571 | lwp->stopped = 1; | |
1572 | ||
1573 | /* No further stops are expected from a dead lwp. */ | |
1574 | lwp->stop_expected = 0; | |
1575 | } | |
1576 | ||
0d62e5e8 DJ |
1577 | static void |
1578 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1579 | { | |
54a0b537 | 1580 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1581 | struct thread_info *saved_inferior; |
a1928bad | 1582 | int wstat; |
95954743 PA |
1583 | ptid_t saved_tid; |
1584 | ptid_t ptid; | |
0d62e5e8 | 1585 | |
54a0b537 | 1586 | if (lwp->stopped) |
0d62e5e8 DJ |
1587 | return; |
1588 | ||
1589 | saved_inferior = current_inferior; | |
bd99dc85 PA |
1590 | if (saved_inferior != NULL) |
1591 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1592 | else | |
95954743 | 1593 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 1594 | |
95954743 | 1595 | ptid = lwp->head.id; |
bd99dc85 PA |
1596 | |
1597 | linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
1598 | |
1599 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1600 | and record the pending SIGSTOP. If the process exited, just | |
1601 | return. */ | |
1602 | if (WIFSTOPPED (wstat) | |
1603 | && WSTOPSIG (wstat) != SIGSTOP) | |
1604 | { | |
1605 | if (debug_threads) | |
24a09b5f | 1606 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
bd99dc85 | 1607 | lwpid_of (lwp), wstat); |
c35fafde PA |
1608 | |
1609 | /* Do not leave a pending single-step finish to be reported to | |
1610 | the client. The client will give us a new action for this | |
1611 | thread, possibly a continue request --- otherwise, the client | |
1612 | would consider this pending SIGTRAP reported later a spurious | |
1613 | signal. */ | |
1614 | if (WSTOPSIG (wstat) == SIGTRAP | |
1615 | && lwp->stepping | |
1616 | && !linux_stopped_by_watchpoint ()) | |
1617 | { | |
1618 | if (debug_threads) | |
1619 | fprintf (stderr, " single-step SIGTRAP ignored\n"); | |
1620 | } | |
1621 | else | |
1622 | { | |
1623 | lwp->status_pending_p = 1; | |
1624 | lwp->status_pending = wstat; | |
1625 | } | |
54a0b537 | 1626 | lwp->stop_expected = 1; |
0d62e5e8 | 1627 | } |
95954743 PA |
1628 | else if (!WIFSTOPPED (wstat)) |
1629 | { | |
1630 | if (debug_threads) | |
1631 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
1632 | lwpid_of (lwp)); | |
1633 | ||
1634 | /* Leave this status pending for the next time we're able to | |
1635 | report it. In the mean time, we'll report this lwp as dead | |
1636 | to GDB, so GDB doesn't try to read registers and memory from | |
1637 | it. */ | |
1638 | mark_lwp_dead (lwp, wstat); | |
1639 | } | |
0d62e5e8 | 1640 | |
bd99dc85 | 1641 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
1642 | current_inferior = saved_inferior; |
1643 | else | |
1644 | { | |
1645 | if (debug_threads) | |
1646 | fprintf (stderr, "Previously current thread died.\n"); | |
1647 | ||
bd99dc85 PA |
1648 | if (non_stop) |
1649 | { | |
1650 | /* We can't change the current inferior behind GDB's back, | |
1651 | otherwise, a subsequent command may apply to the wrong | |
1652 | process. */ | |
1653 | current_inferior = NULL; | |
1654 | } | |
1655 | else | |
1656 | { | |
1657 | /* Set a valid thread as current. */ | |
1658 | set_desired_inferior (0); | |
1659 | } | |
0d62e5e8 DJ |
1660 | } |
1661 | } | |
1662 | ||
1663 | static void | |
54a0b537 | 1664 | stop_all_lwps (void) |
0d62e5e8 DJ |
1665 | { |
1666 | stopping_threads = 1; | |
54a0b537 PA |
1667 | for_each_inferior (&all_lwps, send_sigstop); |
1668 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
1669 | stopping_threads = 0; |
1670 | } | |
1671 | ||
da6d8c04 DJ |
1672 | /* Resume execution of the inferior process. |
1673 | If STEP is nonzero, single-step it. | |
1674 | If SIGNAL is nonzero, give it that signal. */ | |
1675 | ||
ce3a066d | 1676 | static void |
2acc282a | 1677 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 1678 | int step, int signal, siginfo_t *info) |
da6d8c04 | 1679 | { |
0d62e5e8 DJ |
1680 | struct thread_info *saved_inferior; |
1681 | ||
54a0b537 | 1682 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
1683 | return; |
1684 | ||
1685 | /* If we have pending signals or status, and a new signal, enqueue the | |
1686 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1687 | breakpoint; it will be picked up again below. */ | |
1688 | if (signal != 0 | |
54a0b537 PA |
1689 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
1690 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
1691 | { |
1692 | struct pending_signals *p_sig; | |
bca929d3 | 1693 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 1694 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 1695 | p_sig->signal = signal; |
32ca6d61 DJ |
1696 | if (info == NULL) |
1697 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1698 | else | |
1699 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 1700 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
1701 | } |
1702 | ||
54a0b537 | 1703 | if (lwp->status_pending_p && !check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
1704 | return; |
1705 | ||
1706 | saved_inferior = current_inferior; | |
54a0b537 | 1707 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
1708 | |
1709 | if (debug_threads) | |
1b3f6016 | 1710 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 1711 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 1712 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
1713 | |
1714 | /* This bit needs some thinking about. If we get a signal that | |
1715 | we must report while a single-step reinsert is still pending, | |
1716 | we often end up resuming the thread. It might be better to | |
1717 | (ew) allow a stack of pending events; then we could be sure that | |
1718 | the reinsert happened right away and not lose any signals. | |
1719 | ||
1720 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 1721 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
1722 | complete correctness, so it won't solve that problem. It may be |
1723 | worthwhile just to solve this one, however. */ | |
54a0b537 | 1724 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
1725 | { |
1726 | if (debug_threads) | |
54a0b537 | 1727 | fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert); |
0d62e5e8 DJ |
1728 | if (step == 0) |
1729 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1730 | step = 1; | |
1731 | ||
1732 | /* Postpone any pending signal. It was enqueued above. */ | |
1733 | signal = 0; | |
1734 | } | |
1735 | ||
54a0b537 | 1736 | check_removed_breakpoint (lwp); |
0d62e5e8 | 1737 | |
aa691b87 | 1738 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 1739 | { |
47c0c975 DE |
1740 | CORE_ADDR pc = (*the_low_target.get_pc) (); |
1741 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); | |
0d62e5e8 DJ |
1742 | } |
1743 | ||
1744 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1745 | a breakpoint. */ | |
54a0b537 | 1746 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
1747 | { |
1748 | struct pending_signals **p_sig; | |
1749 | ||
54a0b537 | 1750 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
1751 | while ((*p_sig)->prev != NULL) |
1752 | p_sig = &(*p_sig)->prev; | |
1753 | ||
1754 | signal = (*p_sig)->signal; | |
32ca6d61 | 1755 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 1756 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 1757 | |
0d62e5e8 DJ |
1758 | free (*p_sig); |
1759 | *p_sig = NULL; | |
1760 | } | |
1761 | ||
aa5ca48f DE |
1762 | if (the_low_target.prepare_to_resume != NULL) |
1763 | the_low_target.prepare_to_resume (lwp); | |
1764 | ||
0d62e5e8 | 1765 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 1766 | get_lwp_thread (lwp)); |
da6d8c04 | 1767 | errno = 0; |
54a0b537 PA |
1768 | lwp->stopped = 0; |
1769 | lwp->stepping = step; | |
bd99dc85 | 1770 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal); |
0d62e5e8 DJ |
1771 | |
1772 | current_inferior = saved_inferior; | |
da6d8c04 | 1773 | if (errno) |
3221518c UW |
1774 | { |
1775 | /* ESRCH from ptrace either means that the thread was already | |
1776 | running (an error) or that it is gone (a race condition). If | |
1777 | it's gone, we will get a notification the next time we wait, | |
1778 | so we can ignore the error. We could differentiate these | |
1779 | two, but it's tricky without waiting; the thread still exists | |
1780 | as a zombie, so sending it signal 0 would succeed. So just | |
1781 | ignore ESRCH. */ | |
1782 | if (errno == ESRCH) | |
1783 | return; | |
1784 | ||
1785 | perror_with_name ("ptrace"); | |
1786 | } | |
da6d8c04 DJ |
1787 | } |
1788 | ||
2bd7c093 PA |
1789 | struct thread_resume_array |
1790 | { | |
1791 | struct thread_resume *resume; | |
1792 | size_t n; | |
1793 | }; | |
64386c31 DJ |
1794 | |
1795 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1796 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1797 | resume request. | |
1798 | ||
1799 | This algorithm is O(threads * resume elements), but resume elements | |
1800 | is small (and will remain small at least until GDB supports thread | |
1801 | suspension). */ | |
2bd7c093 PA |
1802 | static int |
1803 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 1804 | { |
54a0b537 | 1805 | struct lwp_info *lwp; |
64386c31 | 1806 | struct thread_info *thread; |
5544ad89 | 1807 | int ndx; |
2bd7c093 | 1808 | struct thread_resume_array *r; |
64386c31 DJ |
1809 | |
1810 | thread = (struct thread_info *) entry; | |
54a0b537 | 1811 | lwp = get_thread_lwp (thread); |
2bd7c093 | 1812 | r = arg; |
64386c31 | 1813 | |
2bd7c093 | 1814 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
1815 | { |
1816 | ptid_t ptid = r->resume[ndx].thread; | |
1817 | if (ptid_equal (ptid, minus_one_ptid) | |
1818 | || ptid_equal (ptid, entry->id) | |
1819 | || (ptid_is_pid (ptid) | |
1820 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
1821 | || (ptid_get_lwp (ptid) == -1 | |
1822 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
1823 | { | |
1824 | lwp->resume = &r->resume[ndx]; | |
1825 | return 0; | |
1826 | } | |
1827 | } | |
2bd7c093 PA |
1828 | |
1829 | /* No resume action for this thread. */ | |
1830 | lwp->resume = NULL; | |
64386c31 | 1831 | |
2bd7c093 | 1832 | return 0; |
5544ad89 DJ |
1833 | } |
1834 | ||
5544ad89 | 1835 | |
bd99dc85 PA |
1836 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
1837 | static int | |
1838 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 1839 | { |
bd99dc85 | 1840 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 1841 | |
bd99dc85 PA |
1842 | /* LWPs which will not be resumed are not interesting, because |
1843 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 1844 | if (lwp->resume == NULL) |
bd99dc85 | 1845 | return 0; |
64386c31 | 1846 | |
bd99dc85 PA |
1847 | /* If this thread has a removed breakpoint, we won't have any |
1848 | events to report later, so check now. check_removed_breakpoint | |
1849 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1850 | for any thread that we are not otherwise going to resume - this | |
1851 | lets us preserve stopped status when two threads hit a breakpoint. | |
1852 | GDB removes the breakpoint to single-step a particular thread | |
1853 | past it, then re-inserts it and resumes all threads. We want | |
1854 | to report the second thread without resuming it in the interim. */ | |
1855 | if (lwp->status_pending_p) | |
1856 | check_removed_breakpoint (lwp); | |
5544ad89 | 1857 | |
bd99dc85 PA |
1858 | if (lwp->status_pending_p) |
1859 | * (int *) flag_p = 1; | |
c6ecbae5 | 1860 | |
bd99dc85 | 1861 | return 0; |
5544ad89 DJ |
1862 | } |
1863 | ||
1864 | /* This function is called once per thread. We check the thread's resume | |
1865 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 1866 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 1867 | |
bd99dc85 PA |
1868 | For threads which we aren't explicitly told otherwise, we preserve |
1869 | the stepping flag; this is used for stepping over gdbserver-placed | |
1870 | breakpoints. | |
1871 | ||
1872 | If pending_flags was set in any thread, we queue any needed | |
1873 | signals, since we won't actually resume. We already have a pending | |
1874 | event to report, so we don't need to preserve any step requests; | |
1875 | they should be re-issued if necessary. */ | |
1876 | ||
1877 | static int | |
1878 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 1879 | { |
54a0b537 | 1880 | struct lwp_info *lwp; |
5544ad89 | 1881 | struct thread_info *thread; |
bd99dc85 PA |
1882 | int step; |
1883 | int pending_flag = * (int *) arg; | |
5544ad89 DJ |
1884 | |
1885 | thread = (struct thread_info *) entry; | |
54a0b537 | 1886 | lwp = get_thread_lwp (thread); |
5544ad89 | 1887 | |
2bd7c093 | 1888 | if (lwp->resume == NULL) |
bd99dc85 | 1889 | return 0; |
5544ad89 | 1890 | |
bd99dc85 | 1891 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 1892 | { |
bd99dc85 PA |
1893 | if (debug_threads) |
1894 | fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp)); | |
1895 | ||
1896 | if (!lwp->stopped) | |
1897 | { | |
1898 | if (debug_threads) | |
95954743 | 1899 | fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
1900 | |
1901 | lwp->suspended = 1; | |
1902 | send_sigstop (&lwp->head); | |
1903 | } | |
1904 | else | |
1905 | { | |
1906 | if (debug_threads) | |
1907 | { | |
1908 | if (lwp->suspended) | |
1909 | fprintf (stderr, "already stopped/suspended LWP %ld\n", | |
1910 | lwpid_of (lwp)); | |
1911 | else | |
1912 | fprintf (stderr, "already stopped/not suspended LWP %ld\n", | |
1913 | lwpid_of (lwp)); | |
1914 | } | |
32ca6d61 | 1915 | |
bd99dc85 PA |
1916 | /* Make sure we leave the LWP suspended, so we don't try to |
1917 | resume it without GDB telling us to. FIXME: The LWP may | |
1918 | have been stopped in an internal event that was not meant | |
1919 | to be notified back to GDB (e.g., gdbserver breakpoint), | |
1920 | so we should be reporting a stop event in that case | |
1921 | too. */ | |
1922 | lwp->suspended = 1; | |
1923 | } | |
32ca6d61 | 1924 | |
bd99dc85 PA |
1925 | /* For stop requests, we're done. */ |
1926 | lwp->resume = NULL; | |
1927 | return 0; | |
5544ad89 | 1928 | } |
bd99dc85 PA |
1929 | else |
1930 | lwp->suspended = 0; | |
5544ad89 | 1931 | |
bd99dc85 PA |
1932 | /* If this thread which is about to be resumed has a pending status, |
1933 | then don't resume any threads - we can just report the pending | |
1934 | status. Make sure to queue any signals that would otherwise be | |
1935 | sent. In all-stop mode, we do this decision based on if *any* | |
1936 | thread has a pending status. */ | |
1937 | if (non_stop) | |
1938 | resume_status_pending_p (&lwp->head, &pending_flag); | |
5544ad89 | 1939 | |
bd99dc85 PA |
1940 | if (!pending_flag) |
1941 | { | |
1942 | if (debug_threads) | |
1943 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 1944 | |
95954743 | 1945 | if (ptid_equal (lwp->resume->thread, minus_one_ptid) |
bd99dc85 PA |
1946 | && lwp->stepping |
1947 | && lwp->pending_is_breakpoint) | |
1948 | step = 1; | |
1949 | else | |
1950 | step = (lwp->resume->kind == resume_step); | |
5544ad89 | 1951 | |
2acc282a | 1952 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
1953 | } |
1954 | else | |
1955 | { | |
1956 | if (debug_threads) | |
1957 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 1958 | |
bd99dc85 PA |
1959 | /* If we have a new signal, enqueue the signal. */ |
1960 | if (lwp->resume->sig != 0) | |
1961 | { | |
1962 | struct pending_signals *p_sig; | |
1963 | p_sig = xmalloc (sizeof (*p_sig)); | |
1964 | p_sig->prev = lwp->pending_signals; | |
1965 | p_sig->signal = lwp->resume->sig; | |
1966 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1967 | ||
1968 | /* If this is the same signal we were previously stopped by, | |
1969 | make sure to queue its siginfo. We can ignore the return | |
1970 | value of ptrace; if it fails, we'll skip | |
1971 | PTRACE_SETSIGINFO. */ | |
1972 | if (WIFSTOPPED (lwp->last_status) | |
1973 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
1974 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1975 | ||
1976 | lwp->pending_signals = p_sig; | |
1977 | } | |
1978 | } | |
5544ad89 | 1979 | |
bd99dc85 | 1980 | lwp->resume = NULL; |
5544ad89 | 1981 | return 0; |
0d62e5e8 DJ |
1982 | } |
1983 | ||
1984 | static void | |
2bd7c093 | 1985 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 1986 | { |
5544ad89 | 1987 | int pending_flag; |
2bd7c093 | 1988 | struct thread_resume_array array = { resume_info, n }; |
c6ecbae5 | 1989 | |
2bd7c093 | 1990 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 DJ |
1991 | |
1992 | /* If there is a thread which would otherwise be resumed, which | |
1993 | has a pending status, then don't resume any threads - we can just | |
1994 | report the pending status. Make sure to queue any signals | |
bd99dc85 PA |
1995 | that would otherwise be sent. In non-stop mode, we'll apply this |
1996 | logic to each thread individually. */ | |
5544ad89 | 1997 | pending_flag = 0; |
bd99dc85 PA |
1998 | if (!non_stop) |
1999 | find_inferior (&all_lwps, resume_status_pending_p, &pending_flag); | |
5544ad89 DJ |
2000 | |
2001 | if (debug_threads) | |
2002 | { | |
2003 | if (pending_flag) | |
2004 | fprintf (stderr, "Not resuming, pending status\n"); | |
2005 | else | |
2006 | fprintf (stderr, "Resuming, no pending status\n"); | |
2007 | } | |
2008 | ||
bd99dc85 | 2009 | find_inferior (&all_threads, linux_resume_one_thread, &pending_flag); |
0d62e5e8 DJ |
2010 | } |
2011 | ||
2012 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
2013 | |
2014 | int | |
0a30fbc4 | 2015 | register_addr (int regnum) |
da6d8c04 DJ |
2016 | { |
2017 | int addr; | |
2018 | ||
2ec06d2e | 2019 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
2020 | error ("Invalid register number %d.", regnum); |
2021 | ||
2ec06d2e | 2022 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2023 | |
2024 | return addr; | |
2025 | } | |
2026 | ||
58caa3dc | 2027 | /* Fetch one register. */ |
da6d8c04 DJ |
2028 | static void |
2029 | fetch_register (int regno) | |
2030 | { | |
2031 | CORE_ADDR regaddr; | |
48d93c75 | 2032 | int i, size; |
0d62e5e8 | 2033 | char *buf; |
95954743 | 2034 | int pid; |
da6d8c04 | 2035 | |
2ec06d2e | 2036 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2037 | return; |
2ec06d2e | 2038 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2039 | return; |
da6d8c04 | 2040 | |
0a30fbc4 DJ |
2041 | regaddr = register_addr (regno); |
2042 | if (regaddr == -1) | |
2043 | return; | |
95954743 PA |
2044 | |
2045 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2046 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2047 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2048 | buf = alloca (size); |
2049 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2050 | { |
2051 | errno = 0; | |
0d62e5e8 | 2052 | *(PTRACE_XFER_TYPE *) (buf + i) = |
95954743 | 2053 | ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
da6d8c04 DJ |
2054 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2055 | if (errno != 0) | |
2056 | { | |
2057 | /* Warning, not error, in case we are attached; sometimes the | |
2058 | kernel doesn't let us at the registers. */ | |
2059 | char *err = strerror (errno); | |
2060 | char *msg = alloca (strlen (err) + 128); | |
2061 | sprintf (msg, "reading register %d: %s", regno, err); | |
2062 | error (msg); | |
2063 | goto error_exit; | |
2064 | } | |
2065 | } | |
ee1a7ae4 UW |
2066 | |
2067 | if (the_low_target.supply_ptrace_register) | |
2068 | the_low_target.supply_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2069 | else |
2070 | supply_register (regno, buf); | |
0d62e5e8 | 2071 | |
da6d8c04 DJ |
2072 | error_exit:; |
2073 | } | |
2074 | ||
2075 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
2076 | static void |
2077 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 | 2078 | { |
4463ce24 | 2079 | if (regno == -1) |
2ec06d2e | 2080 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
2081 | fetch_register (regno); |
2082 | else | |
2083 | fetch_register (regno); | |
2084 | } | |
2085 | ||
2086 | /* Store our register values back into the inferior. | |
2087 | If REGNO is -1, do this for all registers. | |
2088 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
2089 | static void |
2090 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
2091 | { |
2092 | CORE_ADDR regaddr; | |
48d93c75 | 2093 | int i, size; |
0d62e5e8 | 2094 | char *buf; |
55ac2b99 | 2095 | int pid; |
da6d8c04 DJ |
2096 | |
2097 | if (regno >= 0) | |
2098 | { | |
2ec06d2e | 2099 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2100 | return; |
2101 | ||
bc1e36ca | 2102 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2103 | return; |
2104 | ||
2105 | regaddr = register_addr (regno); | |
2106 | if (regaddr == -1) | |
da6d8c04 | 2107 | return; |
da6d8c04 | 2108 | errno = 0; |
48d93c75 UW |
2109 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2110 | & - sizeof (PTRACE_XFER_TYPE); | |
2111 | buf = alloca (size); | |
2112 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2113 | |
2114 | if (the_low_target.collect_ptrace_register) | |
2115 | the_low_target.collect_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2116 | else |
2117 | collect_register (regno, buf); | |
ee1a7ae4 | 2118 | |
95954743 | 2119 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2120 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2121 | { |
0a30fbc4 | 2122 | errno = 0; |
95954743 | 2123 | ptrace (PTRACE_POKEUSER, pid, (PTRACE_ARG3_TYPE) regaddr, |
2ff29de4 | 2124 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
2125 | if (errno != 0) |
2126 | { | |
1b3f6016 PA |
2127 | /* At this point, ESRCH should mean the process is |
2128 | already gone, in which case we simply ignore attempts | |
2129 | to change its registers. See also the related | |
2130 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2131 | if (errno == ESRCH) |
2132 | return; | |
2133 | ||
bc1e36ca DJ |
2134 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
2135 | { | |
2136 | char *err = strerror (errno); | |
2137 | char *msg = alloca (strlen (err) + 128); | |
2138 | sprintf (msg, "writing register %d: %s", | |
2139 | regno, err); | |
2140 | error (msg); | |
2141 | return; | |
2142 | } | |
da6d8c04 | 2143 | } |
2ff29de4 | 2144 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2145 | } |
da6d8c04 DJ |
2146 | } |
2147 | else | |
2ec06d2e | 2148 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 2149 | usr_store_inferior_registers (regno); |
da6d8c04 | 2150 | } |
58caa3dc DJ |
2151 | #endif /* HAVE_LINUX_USRREGS */ |
2152 | ||
2153 | ||
2154 | ||
2155 | #ifdef HAVE_LINUX_REGSETS | |
2156 | ||
2157 | static int | |
0d62e5e8 | 2158 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
2159 | { |
2160 | struct regset_info *regset; | |
e9d25b98 | 2161 | int saw_general_regs = 0; |
95954743 | 2162 | int pid; |
58caa3dc DJ |
2163 | |
2164 | regset = target_regsets; | |
2165 | ||
95954743 | 2166 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2167 | while (regset->size >= 0) |
2168 | { | |
2169 | void *buf; | |
2170 | int res; | |
2171 | ||
52fa2412 | 2172 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2173 | { |
2174 | regset ++; | |
2175 | continue; | |
2176 | } | |
2177 | ||
bca929d3 | 2178 | buf = xmalloc (regset->size); |
dfb64f85 | 2179 | #ifndef __sparc__ |
95954743 | 2180 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2181 | #else |
95954743 | 2182 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2183 | #endif |
58caa3dc DJ |
2184 | if (res < 0) |
2185 | { | |
2186 | if (errno == EIO) | |
2187 | { | |
52fa2412 UW |
2188 | /* If we get EIO on a regset, do not try it again for |
2189 | this process. */ | |
2190 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2191 | free (buf); |
52fa2412 | 2192 | continue; |
58caa3dc DJ |
2193 | } |
2194 | else | |
2195 | { | |
0d62e5e8 | 2196 | char s[256]; |
95954743 PA |
2197 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
2198 | pid); | |
0d62e5e8 | 2199 | perror (s); |
58caa3dc DJ |
2200 | } |
2201 | } | |
e9d25b98 DJ |
2202 | else if (regset->type == GENERAL_REGS) |
2203 | saw_general_regs = 1; | |
58caa3dc DJ |
2204 | regset->store_function (buf); |
2205 | regset ++; | |
fdeb2a12 | 2206 | free (buf); |
58caa3dc | 2207 | } |
e9d25b98 DJ |
2208 | if (saw_general_regs) |
2209 | return 0; | |
2210 | else | |
2211 | return 1; | |
58caa3dc DJ |
2212 | } |
2213 | ||
2214 | static int | |
0d62e5e8 | 2215 | regsets_store_inferior_registers () |
58caa3dc DJ |
2216 | { |
2217 | struct regset_info *regset; | |
e9d25b98 | 2218 | int saw_general_regs = 0; |
95954743 | 2219 | int pid; |
58caa3dc DJ |
2220 | |
2221 | regset = target_regsets; | |
2222 | ||
95954743 | 2223 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2224 | while (regset->size >= 0) |
2225 | { | |
2226 | void *buf; | |
2227 | int res; | |
2228 | ||
52fa2412 | 2229 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2230 | { |
2231 | regset ++; | |
2232 | continue; | |
2233 | } | |
2234 | ||
bca929d3 | 2235 | buf = xmalloc (regset->size); |
545587ee DJ |
2236 | |
2237 | /* First fill the buffer with the current register set contents, | |
2238 | in case there are any items in the kernel's regset that are | |
2239 | not in gdbserver's regcache. */ | |
dfb64f85 | 2240 | #ifndef __sparc__ |
95954743 | 2241 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2242 | #else |
95954743 | 2243 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2244 | #endif |
545587ee DJ |
2245 | |
2246 | if (res == 0) | |
2247 | { | |
2248 | /* Then overlay our cached registers on that. */ | |
2249 | regset->fill_function (buf); | |
2250 | ||
2251 | /* Only now do we write the register set. */ | |
dfb64f85 | 2252 | #ifndef __sparc__ |
95954743 | 2253 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 2254 | #else |
95954743 | 2255 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 2256 | #endif |
545587ee DJ |
2257 | } |
2258 | ||
58caa3dc DJ |
2259 | if (res < 0) |
2260 | { | |
2261 | if (errno == EIO) | |
2262 | { | |
52fa2412 UW |
2263 | /* If we get EIO on a regset, do not try it again for |
2264 | this process. */ | |
2265 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2266 | free (buf); |
52fa2412 | 2267 | continue; |
58caa3dc | 2268 | } |
3221518c UW |
2269 | else if (errno == ESRCH) |
2270 | { | |
1b3f6016 PA |
2271 | /* At this point, ESRCH should mean the process is |
2272 | already gone, in which case we simply ignore attempts | |
2273 | to change its registers. See also the related | |
2274 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 2275 | free (buf); |
3221518c UW |
2276 | return 0; |
2277 | } | |
58caa3dc DJ |
2278 | else |
2279 | { | |
ce3a066d | 2280 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
2281 | } |
2282 | } | |
e9d25b98 DJ |
2283 | else if (regset->type == GENERAL_REGS) |
2284 | saw_general_regs = 1; | |
58caa3dc | 2285 | regset ++; |
09ec9b38 | 2286 | free (buf); |
58caa3dc | 2287 | } |
e9d25b98 DJ |
2288 | if (saw_general_regs) |
2289 | return 0; | |
2290 | else | |
2291 | return 1; | |
ce3a066d | 2292 | return 0; |
58caa3dc DJ |
2293 | } |
2294 | ||
2295 | #endif /* HAVE_LINUX_REGSETS */ | |
2296 | ||
2297 | ||
2298 | void | |
ce3a066d | 2299 | linux_fetch_registers (int regno) |
58caa3dc DJ |
2300 | { |
2301 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2302 | if (regsets_fetch_inferior_registers () == 0) |
2303 | return; | |
58caa3dc DJ |
2304 | #endif |
2305 | #ifdef HAVE_LINUX_USRREGS | |
2306 | usr_fetch_inferior_registers (regno); | |
2307 | #endif | |
2308 | } | |
2309 | ||
2310 | void | |
ce3a066d | 2311 | linux_store_registers (int regno) |
58caa3dc DJ |
2312 | { |
2313 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2314 | if (regsets_store_inferior_registers () == 0) |
2315 | return; | |
58caa3dc DJ |
2316 | #endif |
2317 | #ifdef HAVE_LINUX_USRREGS | |
2318 | usr_store_inferior_registers (regno); | |
2319 | #endif | |
2320 | } | |
2321 | ||
da6d8c04 | 2322 | |
da6d8c04 DJ |
2323 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
2324 | to debugger memory starting at MYADDR. */ | |
2325 | ||
c3e735a6 | 2326 | static int |
f450004a | 2327 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
2328 | { |
2329 | register int i; | |
2330 | /* Round starting address down to longword boundary. */ | |
2331 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2332 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
2333 | register int count |
2334 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
2335 | / sizeof (PTRACE_XFER_TYPE); |
2336 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 2337 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 2338 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
2339 | int fd; |
2340 | char filename[64]; | |
95954743 | 2341 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
2342 | |
2343 | /* Try using /proc. Don't bother for one word. */ | |
2344 | if (len >= 3 * sizeof (long)) | |
2345 | { | |
2346 | /* We could keep this file open and cache it - possibly one per | |
2347 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 2348 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
2349 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
2350 | if (fd == -1) | |
2351 | goto no_proc; | |
2352 | ||
2353 | /* If pread64 is available, use it. It's faster if the kernel | |
2354 | supports it (only one syscall), and it's 64-bit safe even on | |
2355 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
2356 | application). */ | |
2357 | #ifdef HAVE_PREAD64 | |
2358 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
2359 | #else | |
2360 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len) | |
2361 | #endif | |
2362 | { | |
2363 | close (fd); | |
2364 | goto no_proc; | |
2365 | } | |
2366 | ||
2367 | close (fd); | |
2368 | return 0; | |
2369 | } | |
da6d8c04 | 2370 | |
fd462a61 | 2371 | no_proc: |
da6d8c04 DJ |
2372 | /* Read all the longwords */ |
2373 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2374 | { | |
c3e735a6 | 2375 | errno = 0; |
95954743 | 2376 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
c3e735a6 DJ |
2377 | if (errno) |
2378 | return errno; | |
da6d8c04 DJ |
2379 | } |
2380 | ||
2381 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
2382 | memcpy (myaddr, |
2383 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
2384 | len); | |
c3e735a6 DJ |
2385 | |
2386 | return 0; | |
da6d8c04 DJ |
2387 | } |
2388 | ||
2389 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
2390 | to inferior's memory at MEMADDR. | |
2391 | On failure (cannot write the inferior) | |
2392 | returns the value of errno. */ | |
2393 | ||
ce3a066d | 2394 | static int |
f450004a | 2395 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
2396 | { |
2397 | register int i; | |
2398 | /* Round starting address down to longword boundary. */ | |
2399 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2400 | /* Round ending address up; get number of longwords that makes. */ | |
2401 | register int count | |
2402 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
2403 | /* Allocate buffer of that many longwords. */ | |
2404 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 2405 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 2406 | |
0d62e5e8 DJ |
2407 | if (debug_threads) |
2408 | { | |
58d6951d DJ |
2409 | /* Dump up to four bytes. */ |
2410 | unsigned int val = * (unsigned int *) myaddr; | |
2411 | if (len == 1) | |
2412 | val = val & 0xff; | |
2413 | else if (len == 2) | |
2414 | val = val & 0xffff; | |
2415 | else if (len == 3) | |
2416 | val = val & 0xffffff; | |
2417 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
2418 | val, (long)memaddr); | |
0d62e5e8 DJ |
2419 | } |
2420 | ||
da6d8c04 DJ |
2421 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
2422 | ||
95954743 | 2423 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
da6d8c04 DJ |
2424 | |
2425 | if (count > 1) | |
2426 | { | |
2427 | buffer[count - 1] | |
95954743 | 2428 | = ptrace (PTRACE_PEEKTEXT, pid, |
d844cde6 DJ |
2429 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
2430 | * sizeof (PTRACE_XFER_TYPE)), | |
2431 | 0); | |
da6d8c04 DJ |
2432 | } |
2433 | ||
2434 | /* Copy data to be written over corresponding part of buffer */ | |
2435 | ||
2436 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
2437 | ||
2438 | /* Write the entire buffer. */ | |
2439 | ||
2440 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2441 | { | |
2442 | errno = 0; | |
95954743 | 2443 | ptrace (PTRACE_POKETEXT, pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
2444 | if (errno) |
2445 | return errno; | |
2446 | } | |
2447 | ||
2448 | return 0; | |
2449 | } | |
2f2893d9 | 2450 | |
24a09b5f DJ |
2451 | static int linux_supports_tracefork_flag; |
2452 | ||
51c2684e | 2453 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 2454 | |
51c2684e DJ |
2455 | static int |
2456 | linux_tracefork_grandchild (void *arg) | |
2457 | { | |
2458 | _exit (0); | |
2459 | } | |
2460 | ||
7407e2de AS |
2461 | #define STACK_SIZE 4096 |
2462 | ||
51c2684e DJ |
2463 | static int |
2464 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
2465 | { |
2466 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
2467 | kill (getpid (), SIGSTOP); | |
7407e2de AS |
2468 | #ifdef __ia64__ |
2469 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
2470 | CLONE_VM | SIGCHLD, NULL); | |
2471 | #else | |
2472 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
2473 | CLONE_VM | SIGCHLD, NULL); | |
2474 | #endif | |
24a09b5f DJ |
2475 | _exit (0); |
2476 | } | |
2477 | ||
bd99dc85 PA |
2478 | /* Wrapper function for waitpid which handles EINTR, and emulates |
2479 | __WALL for systems where that is not available. */ | |
24a09b5f DJ |
2480 | |
2481 | static int | |
2482 | my_waitpid (int pid, int *status, int flags) | |
2483 | { | |
bd99dc85 PA |
2484 | int ret, out_errno; |
2485 | ||
2486 | if (debug_threads) | |
2487 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
2488 | ||
2489 | if (flags & __WALL) | |
24a09b5f | 2490 | { |
bd99dc85 PA |
2491 | sigset_t block_mask, org_mask, wake_mask; |
2492 | int wnohang; | |
2493 | ||
2494 | wnohang = (flags & WNOHANG) != 0; | |
2495 | flags &= ~(__WALL | __WCLONE); | |
2496 | flags |= WNOHANG; | |
2497 | ||
2498 | /* Block all signals while here. This avoids knowing about | |
2499 | LinuxThread's signals. */ | |
2500 | sigfillset (&block_mask); | |
2501 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
2502 | ||
2503 | /* ... except during the sigsuspend below. */ | |
2504 | sigemptyset (&wake_mask); | |
2505 | ||
2506 | while (1) | |
2507 | { | |
2508 | /* Since all signals are blocked, there's no need to check | |
2509 | for EINTR here. */ | |
2510 | ret = waitpid (pid, status, flags); | |
2511 | out_errno = errno; | |
2512 | ||
2513 | if (ret == -1 && out_errno != ECHILD) | |
2514 | break; | |
2515 | else if (ret > 0) | |
2516 | break; | |
2517 | ||
2518 | if (flags & __WCLONE) | |
2519 | { | |
2520 | /* We've tried both flavors now. If WNOHANG is set, | |
2521 | there's nothing else to do, just bail out. */ | |
2522 | if (wnohang) | |
2523 | break; | |
2524 | ||
2525 | if (debug_threads) | |
2526 | fprintf (stderr, "blocking\n"); | |
2527 | ||
2528 | /* Block waiting for signals. */ | |
2529 | sigsuspend (&wake_mask); | |
2530 | } | |
2531 | ||
2532 | flags ^= __WCLONE; | |
2533 | } | |
2534 | ||
2535 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
24a09b5f | 2536 | } |
bd99dc85 PA |
2537 | else |
2538 | { | |
2539 | do | |
2540 | ret = waitpid (pid, status, flags); | |
2541 | while (ret == -1 && errno == EINTR); | |
2542 | out_errno = errno; | |
2543 | } | |
2544 | ||
2545 | if (debug_threads) | |
2546 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
2547 | pid, flags, status ? *status : -1, ret); | |
24a09b5f | 2548 | |
bd99dc85 | 2549 | errno = out_errno; |
24a09b5f DJ |
2550 | return ret; |
2551 | } | |
2552 | ||
2553 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make | |
2554 | sure that we can enable the option, and that it had the desired | |
2555 | effect. */ | |
2556 | ||
2557 | static void | |
2558 | linux_test_for_tracefork (void) | |
2559 | { | |
2560 | int child_pid, ret, status; | |
2561 | long second_pid; | |
bca929d3 | 2562 | char *stack = xmalloc (STACK_SIZE * 4); |
24a09b5f DJ |
2563 | |
2564 | linux_supports_tracefork_flag = 0; | |
2565 | ||
51c2684e | 2566 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
2567 | #ifdef __ia64__ |
2568 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
2569 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2570 | #else | |
2571 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, | |
2572 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2573 | #endif | |
24a09b5f | 2574 | if (child_pid == -1) |
51c2684e | 2575 | perror_with_name ("clone"); |
24a09b5f DJ |
2576 | |
2577 | ret = my_waitpid (child_pid, &status, 0); | |
2578 | if (ret == -1) | |
2579 | perror_with_name ("waitpid"); | |
2580 | else if (ret != child_pid) | |
2581 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
2582 | if (! WIFSTOPPED (status)) | |
2583 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
2584 | ||
2585 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); | |
2586 | if (ret != 0) | |
2587 | { | |
2588 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2589 | if (ret != 0) | |
2590 | { | |
2591 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2592 | return; | |
2593 | } | |
2594 | ||
2595 | ret = my_waitpid (child_pid, &status, 0); | |
2596 | if (ret != child_pid) | |
2597 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
2598 | else if (!WIFSIGNALED (status)) | |
2599 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
2600 | "killed child", status); | |
2601 | ||
2602 | return; | |
2603 | } | |
2604 | ||
2605 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
2606 | if (ret != 0) | |
2607 | warning ("linux_test_for_tracefork: failed to resume child"); | |
2608 | ||
2609 | ret = my_waitpid (child_pid, &status, 0); | |
2610 | ||
2611 | if (ret == child_pid && WIFSTOPPED (status) | |
2612 | && status >> 16 == PTRACE_EVENT_FORK) | |
2613 | { | |
2614 | second_pid = 0; | |
2615 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
2616 | if (ret == 0 && second_pid != 0) | |
2617 | { | |
2618 | int second_status; | |
2619 | ||
2620 | linux_supports_tracefork_flag = 1; | |
2621 | my_waitpid (second_pid, &second_status, 0); | |
2622 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
2623 | if (ret != 0) | |
2624 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
2625 | my_waitpid (second_pid, &status, 0); | |
2626 | } | |
2627 | } | |
2628 | else | |
2629 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
2630 | "(%d, status 0x%x)", ret, status); | |
2631 | ||
2632 | do | |
2633 | { | |
2634 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2635 | if (ret != 0) | |
2636 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2637 | my_waitpid (child_pid, &status, 0); | |
2638 | } | |
2639 | while (WIFSTOPPED (status)); | |
51c2684e DJ |
2640 | |
2641 | free (stack); | |
24a09b5f DJ |
2642 | } |
2643 | ||
2644 | ||
2f2893d9 DJ |
2645 | static void |
2646 | linux_look_up_symbols (void) | |
2647 | { | |
0d62e5e8 | 2648 | #ifdef USE_THREAD_DB |
95954743 PA |
2649 | struct process_info *proc = current_process (); |
2650 | ||
cdbfd419 | 2651 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
2652 | return; |
2653 | ||
cdbfd419 | 2654 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
2655 | #endif |
2656 | } | |
2657 | ||
e5379b03 | 2658 | static void |
ef57601b | 2659 | linux_request_interrupt (void) |
e5379b03 | 2660 | { |
a1928bad | 2661 | extern unsigned long signal_pid; |
e5379b03 | 2662 | |
95954743 PA |
2663 | if (!ptid_equal (cont_thread, null_ptid) |
2664 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 2665 | { |
54a0b537 | 2666 | struct lwp_info *lwp; |
bd99dc85 | 2667 | int lwpid; |
e5379b03 | 2668 | |
54a0b537 | 2669 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
2670 | lwpid = lwpid_of (lwp); |
2671 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
2672 | } |
2673 | else | |
ef57601b | 2674 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
2675 | } |
2676 | ||
aa691b87 RM |
2677 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
2678 | to debugger memory starting at MYADDR. */ | |
2679 | ||
2680 | static int | |
f450004a | 2681 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
2682 | { |
2683 | char filename[PATH_MAX]; | |
2684 | int fd, n; | |
95954743 | 2685 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 2686 | |
95954743 | 2687 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
2688 | |
2689 | fd = open (filename, O_RDONLY); | |
2690 | if (fd < 0) | |
2691 | return -1; | |
2692 | ||
2693 | if (offset != (CORE_ADDR) 0 | |
2694 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
2695 | n = -1; | |
2696 | else | |
2697 | n = read (fd, myaddr, len); | |
2698 | ||
2699 | close (fd); | |
2700 | ||
2701 | return n; | |
2702 | } | |
2703 | ||
d993e290 PA |
2704 | /* These breakpoint and watchpoint related wrapper functions simply |
2705 | pass on the function call if the target has registered a | |
2706 | corresponding function. */ | |
e013ee27 OF |
2707 | |
2708 | static int | |
d993e290 | 2709 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2710 | { |
d993e290 PA |
2711 | if (the_low_target.insert_point != NULL) |
2712 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
2713 | else |
2714 | /* Unsupported (see target.h). */ | |
2715 | return 1; | |
2716 | } | |
2717 | ||
2718 | static int | |
d993e290 | 2719 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2720 | { |
d993e290 PA |
2721 | if (the_low_target.remove_point != NULL) |
2722 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
2723 | else |
2724 | /* Unsupported (see target.h). */ | |
2725 | return 1; | |
2726 | } | |
2727 | ||
2728 | static int | |
2729 | linux_stopped_by_watchpoint (void) | |
2730 | { | |
2731 | if (the_low_target.stopped_by_watchpoint != NULL) | |
2732 | return the_low_target.stopped_by_watchpoint (); | |
2733 | else | |
2734 | return 0; | |
2735 | } | |
2736 | ||
2737 | static CORE_ADDR | |
2738 | linux_stopped_data_address (void) | |
2739 | { | |
2740 | if (the_low_target.stopped_data_address != NULL) | |
2741 | return the_low_target.stopped_data_address (); | |
2742 | else | |
2743 | return 0; | |
2744 | } | |
2745 | ||
42c81e2a | 2746 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
2747 | #if defined(__mcoldfire__) |
2748 | /* These should really be defined in the kernel's ptrace.h header. */ | |
2749 | #define PT_TEXT_ADDR 49*4 | |
2750 | #define PT_DATA_ADDR 50*4 | |
2751 | #define PT_TEXT_END_ADDR 51*4 | |
2752 | #endif | |
2753 | ||
2754 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
2755 | to tell gdb about. */ | |
2756 | ||
2757 | static int | |
2758 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
2759 | { | |
2760 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
2761 | unsigned long text, text_end, data; | |
bd99dc85 | 2762 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
2763 | |
2764 | errno = 0; | |
2765 | ||
2766 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
2767 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
2768 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
2769 | ||
2770 | if (errno == 0) | |
2771 | { | |
2772 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
2773 | used by gdb) are relative to the beginning of the program, |
2774 | with the data segment immediately following the text segment. | |
2775 | However, the actual runtime layout in memory may put the data | |
2776 | somewhere else, so when we send gdb a data base-address, we | |
2777 | use the real data base address and subtract the compile-time | |
2778 | data base-address from it (which is just the length of the | |
2779 | text segment). BSS immediately follows data in both | |
2780 | cases. */ | |
52fb6437 NS |
2781 | *text_p = text; |
2782 | *data_p = data - (text_end - text); | |
1b3f6016 | 2783 | |
52fb6437 NS |
2784 | return 1; |
2785 | } | |
2786 | #endif | |
2787 | return 0; | |
2788 | } | |
2789 | #endif | |
2790 | ||
07e059b5 VP |
2791 | static int |
2792 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
2793 | unsigned char *readbuf, unsigned const char *writebuf, |
2794 | CORE_ADDR offset, int len) | |
07e059b5 VP |
2795 | { |
2796 | /* We make the process list snapshot when the object starts to be | |
2797 | read. */ | |
2798 | static const char *buf; | |
2799 | static long len_avail = -1; | |
2800 | static struct buffer buffer; | |
2801 | ||
2802 | DIR *dirp; | |
2803 | ||
2804 | if (strcmp (annex, "processes") != 0) | |
2805 | return 0; | |
2806 | ||
2807 | if (!readbuf || writebuf) | |
2808 | return 0; | |
2809 | ||
2810 | if (offset == 0) | |
2811 | { | |
2812 | if (len_avail != -1 && len_avail != 0) | |
2813 | buffer_free (&buffer); | |
2814 | len_avail = 0; | |
2815 | buf = NULL; | |
2816 | buffer_init (&buffer); | |
2817 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
2818 | ||
2819 | dirp = opendir ("/proc"); | |
2820 | if (dirp) | |
2821 | { | |
1b3f6016 PA |
2822 | struct dirent *dp; |
2823 | while ((dp = readdir (dirp)) != NULL) | |
2824 | { | |
2825 | struct stat statbuf; | |
2826 | char procentry[sizeof ("/proc/4294967295")]; | |
2827 | ||
2828 | if (!isdigit (dp->d_name[0]) | |
2829 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
2830 | continue; | |
2831 | ||
2832 | sprintf (procentry, "/proc/%s", dp->d_name); | |
2833 | if (stat (procentry, &statbuf) == 0 | |
2834 | && S_ISDIR (statbuf.st_mode)) | |
2835 | { | |
2836 | char pathname[128]; | |
2837 | FILE *f; | |
2838 | char cmd[MAXPATHLEN + 1]; | |
2839 | struct passwd *entry; | |
2840 | ||
2841 | sprintf (pathname, "/proc/%s/cmdline", dp->d_name); | |
2842 | entry = getpwuid (statbuf.st_uid); | |
2843 | ||
2844 | if ((f = fopen (pathname, "r")) != NULL) | |
2845 | { | |
2846 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
2847 | if (len > 0) | |
2848 | { | |
2849 | int i; | |
2850 | for (i = 0; i < len; i++) | |
2851 | if (cmd[i] == '\0') | |
2852 | cmd[i] = ' '; | |
2853 | cmd[len] = '\0'; | |
2854 | ||
2855 | buffer_xml_printf ( | |
07e059b5 VP |
2856 | &buffer, |
2857 | "<item>" | |
2858 | "<column name=\"pid\">%s</column>" | |
2859 | "<column name=\"user\">%s</column>" | |
2860 | "<column name=\"command\">%s</column>" | |
2861 | "</item>", | |
2862 | dp->d_name, | |
2863 | entry ? entry->pw_name : "?", | |
2864 | cmd); | |
1b3f6016 PA |
2865 | } |
2866 | fclose (f); | |
2867 | } | |
2868 | } | |
2869 | } | |
07e059b5 | 2870 | |
1b3f6016 | 2871 | closedir (dirp); |
07e059b5 VP |
2872 | } |
2873 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
2874 | buf = buffer_finish (&buffer); | |
2875 | len_avail = strlen (buf); | |
2876 | } | |
2877 | ||
2878 | if (offset >= len_avail) | |
2879 | { | |
2880 | /* Done. Get rid of the data. */ | |
2881 | buffer_free (&buffer); | |
2882 | buf = NULL; | |
2883 | len_avail = 0; | |
2884 | return 0; | |
2885 | } | |
2886 | ||
2887 | if (len > len_avail - offset) | |
2888 | len = len_avail - offset; | |
2889 | memcpy (readbuf, buf + offset, len); | |
2890 | ||
2891 | return len; | |
2892 | } | |
2893 | ||
d0722149 DE |
2894 | /* Convert a native/host siginfo object, into/from the siginfo in the |
2895 | layout of the inferiors' architecture. */ | |
2896 | ||
2897 | static void | |
2898 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
2899 | { | |
2900 | int done = 0; | |
2901 | ||
2902 | if (the_low_target.siginfo_fixup != NULL) | |
2903 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
2904 | ||
2905 | /* If there was no callback, or the callback didn't do anything, | |
2906 | then just do a straight memcpy. */ | |
2907 | if (!done) | |
2908 | { | |
2909 | if (direction == 1) | |
2910 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
2911 | else | |
2912 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
2913 | } | |
2914 | } | |
2915 | ||
4aa995e1 PA |
2916 | static int |
2917 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
2918 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
2919 | { | |
d0722149 | 2920 | int pid; |
4aa995e1 | 2921 | struct siginfo siginfo; |
d0722149 | 2922 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
2923 | |
2924 | if (current_inferior == NULL) | |
2925 | return -1; | |
2926 | ||
bd99dc85 | 2927 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
2928 | |
2929 | if (debug_threads) | |
d0722149 | 2930 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
2931 | readbuf != NULL ? "Reading" : "Writing", |
2932 | pid); | |
2933 | ||
2934 | if (offset > sizeof (siginfo)) | |
2935 | return -1; | |
2936 | ||
2937 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
2938 | return -1; | |
2939 | ||
d0722149 DE |
2940 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
2941 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
2942 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
2943 | with a 32-bit GDBSERVER, we need to convert it. */ | |
2944 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
2945 | ||
4aa995e1 PA |
2946 | if (offset + len > sizeof (siginfo)) |
2947 | len = sizeof (siginfo) - offset; | |
2948 | ||
2949 | if (readbuf != NULL) | |
d0722149 | 2950 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
2951 | else |
2952 | { | |
d0722149 DE |
2953 | memcpy (inf_siginfo + offset, writebuf, len); |
2954 | ||
2955 | /* Convert back to ptrace layout before flushing it out. */ | |
2956 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
2957 | ||
4aa995e1 PA |
2958 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
2959 | return -1; | |
2960 | } | |
2961 | ||
2962 | return len; | |
2963 | } | |
2964 | ||
bd99dc85 PA |
2965 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
2966 | so we notice when children change state; as the handler for the | |
2967 | sigsuspend in my_waitpid. */ | |
2968 | ||
2969 | static void | |
2970 | sigchld_handler (int signo) | |
2971 | { | |
2972 | int old_errno = errno; | |
2973 | ||
2974 | if (debug_threads) | |
2975 | /* fprintf is not async-signal-safe, so call write directly. */ | |
2976 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
2977 | ||
2978 | if (target_is_async_p ()) | |
2979 | async_file_mark (); /* trigger a linux_wait */ | |
2980 | ||
2981 | errno = old_errno; | |
2982 | } | |
2983 | ||
2984 | static int | |
2985 | linux_supports_non_stop (void) | |
2986 | { | |
2987 | return 1; | |
2988 | } | |
2989 | ||
2990 | static int | |
2991 | linux_async (int enable) | |
2992 | { | |
2993 | int previous = (linux_event_pipe[0] != -1); | |
2994 | ||
2995 | if (previous != enable) | |
2996 | { | |
2997 | sigset_t mask; | |
2998 | sigemptyset (&mask); | |
2999 | sigaddset (&mask, SIGCHLD); | |
3000 | ||
3001 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
3002 | ||
3003 | if (enable) | |
3004 | { | |
3005 | if (pipe (linux_event_pipe) == -1) | |
3006 | fatal ("creating event pipe failed."); | |
3007 | ||
3008 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
3009 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
3010 | ||
3011 | /* Register the event loop handler. */ | |
3012 | add_file_handler (linux_event_pipe[0], | |
3013 | handle_target_event, NULL); | |
3014 | ||
3015 | /* Always trigger a linux_wait. */ | |
3016 | async_file_mark (); | |
3017 | } | |
3018 | else | |
3019 | { | |
3020 | delete_file_handler (linux_event_pipe[0]); | |
3021 | ||
3022 | close (linux_event_pipe[0]); | |
3023 | close (linux_event_pipe[1]); | |
3024 | linux_event_pipe[0] = -1; | |
3025 | linux_event_pipe[1] = -1; | |
3026 | } | |
3027 | ||
3028 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
3029 | } | |
3030 | ||
3031 | return previous; | |
3032 | } | |
3033 | ||
3034 | static int | |
3035 | linux_start_non_stop (int nonstop) | |
3036 | { | |
3037 | /* Register or unregister from event-loop accordingly. */ | |
3038 | linux_async (nonstop); | |
3039 | return 0; | |
3040 | } | |
3041 | ||
cf8fd78b PA |
3042 | static int |
3043 | linux_supports_multi_process (void) | |
3044 | { | |
3045 | return 1; | |
3046 | } | |
3047 | ||
efcbbd14 UW |
3048 | |
3049 | /* Enumerate spufs IDs for process PID. */ | |
3050 | static int | |
3051 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
3052 | { | |
3053 | int pos = 0; | |
3054 | int written = 0; | |
3055 | char path[128]; | |
3056 | DIR *dir; | |
3057 | struct dirent *entry; | |
3058 | ||
3059 | sprintf (path, "/proc/%ld/fd", pid); | |
3060 | dir = opendir (path); | |
3061 | if (!dir) | |
3062 | return -1; | |
3063 | ||
3064 | rewinddir (dir); | |
3065 | while ((entry = readdir (dir)) != NULL) | |
3066 | { | |
3067 | struct stat st; | |
3068 | struct statfs stfs; | |
3069 | int fd; | |
3070 | ||
3071 | fd = atoi (entry->d_name); | |
3072 | if (!fd) | |
3073 | continue; | |
3074 | ||
3075 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
3076 | if (stat (path, &st) != 0) | |
3077 | continue; | |
3078 | if (!S_ISDIR (st.st_mode)) | |
3079 | continue; | |
3080 | ||
3081 | if (statfs (path, &stfs) != 0) | |
3082 | continue; | |
3083 | if (stfs.f_type != SPUFS_MAGIC) | |
3084 | continue; | |
3085 | ||
3086 | if (pos >= offset && pos + 4 <= offset + len) | |
3087 | { | |
3088 | *(unsigned int *)(buf + pos - offset) = fd; | |
3089 | written += 4; | |
3090 | } | |
3091 | pos += 4; | |
3092 | } | |
3093 | ||
3094 | closedir (dir); | |
3095 | return written; | |
3096 | } | |
3097 | ||
3098 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
3099 | object type, using the /proc file system. */ | |
3100 | static int | |
3101 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
3102 | unsigned const char *writebuf, | |
3103 | CORE_ADDR offset, int len) | |
3104 | { | |
3105 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
3106 | char buf[128]; | |
3107 | int fd = 0; | |
3108 | int ret = 0; | |
3109 | ||
3110 | if (!writebuf && !readbuf) | |
3111 | return -1; | |
3112 | ||
3113 | if (!*annex) | |
3114 | { | |
3115 | if (!readbuf) | |
3116 | return -1; | |
3117 | else | |
3118 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
3119 | } | |
3120 | ||
3121 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
3122 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
3123 | if (fd <= 0) | |
3124 | return -1; | |
3125 | ||
3126 | if (offset != 0 | |
3127 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
3128 | { | |
3129 | close (fd); | |
3130 | return 0; | |
3131 | } | |
3132 | ||
3133 | if (writebuf) | |
3134 | ret = write (fd, writebuf, (size_t) len); | |
3135 | else | |
3136 | ret = read (fd, readbuf, (size_t) len); | |
3137 | ||
3138 | close (fd); | |
3139 | return ret; | |
3140 | } | |
3141 | ||
ce3a066d DJ |
3142 | static struct target_ops linux_target_ops = { |
3143 | linux_create_inferior, | |
3144 | linux_attach, | |
3145 | linux_kill, | |
6ad8ae5c | 3146 | linux_detach, |
444d6139 | 3147 | linux_join, |
ce3a066d DJ |
3148 | linux_thread_alive, |
3149 | linux_resume, | |
3150 | linux_wait, | |
3151 | linux_fetch_registers, | |
3152 | linux_store_registers, | |
3153 | linux_read_memory, | |
3154 | linux_write_memory, | |
2f2893d9 | 3155 | linux_look_up_symbols, |
ef57601b | 3156 | linux_request_interrupt, |
aa691b87 | 3157 | linux_read_auxv, |
d993e290 PA |
3158 | linux_insert_point, |
3159 | linux_remove_point, | |
e013ee27 OF |
3160 | linux_stopped_by_watchpoint, |
3161 | linux_stopped_data_address, | |
42c81e2a | 3162 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 3163 | linux_read_offsets, |
dae5f5cf DJ |
3164 | #else |
3165 | NULL, | |
3166 | #endif | |
3167 | #ifdef USE_THREAD_DB | |
3168 | thread_db_get_tls_address, | |
3169 | #else | |
3170 | NULL, | |
52fb6437 | 3171 | #endif |
efcbbd14 | 3172 | linux_qxfer_spu, |
59a016f0 | 3173 | hostio_last_error_from_errno, |
07e059b5 | 3174 | linux_qxfer_osdata, |
4aa995e1 | 3175 | linux_xfer_siginfo, |
bd99dc85 PA |
3176 | linux_supports_non_stop, |
3177 | linux_async, | |
3178 | linux_start_non_stop, | |
cdbfd419 PP |
3179 | linux_supports_multi_process, |
3180 | #ifdef USE_THREAD_DB | |
3181 | thread_db_handle_monitor_command | |
3182 | #else | |
3183 | NULL | |
3184 | #endif | |
ce3a066d DJ |
3185 | }; |
3186 | ||
0d62e5e8 DJ |
3187 | static void |
3188 | linux_init_signals () | |
3189 | { | |
3190 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
3191 | to find what the cancel signal actually is. */ | |
254787d4 | 3192 | signal (__SIGRTMIN+1, SIG_IGN); |
0d62e5e8 DJ |
3193 | } |
3194 | ||
da6d8c04 DJ |
3195 | void |
3196 | initialize_low (void) | |
3197 | { | |
bd99dc85 PA |
3198 | struct sigaction sigchld_action; |
3199 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 3200 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
3201 | set_breakpoint_data (the_low_target.breakpoint, |
3202 | the_low_target.breakpoint_len); | |
0d62e5e8 | 3203 | linux_init_signals (); |
24a09b5f | 3204 | linux_test_for_tracefork (); |
52fa2412 UW |
3205 | #ifdef HAVE_LINUX_REGSETS |
3206 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
3207 | ; | |
bca929d3 | 3208 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 3209 | #endif |
bd99dc85 PA |
3210 | |
3211 | sigchld_action.sa_handler = sigchld_handler; | |
3212 | sigemptyset (&sigchld_action.sa_mask); | |
3213 | sigchld_action.sa_flags = SA_RESTART; | |
3214 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 3215 | } |