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 | |
fd7dd3e6 | 262 | linux_remove_process (struct process_info *process, int detaching) |
5091eb23 | 263 | { |
cdbfd419 PP |
264 | struct process_info_private *priv = process->private; |
265 | ||
266 | #ifdef USE_THREAD_DB | |
fd7dd3e6 | 267 | thread_db_free (process, detaching); |
cdbfd419 PP |
268 | #endif |
269 | ||
270 | free (priv->arch_private); | |
271 | free (priv); | |
5091eb23 DE |
272 | remove_process (process); |
273 | } | |
274 | ||
07d4f67e DE |
275 | /* Wrapper function for waitpid which handles EINTR, and emulates |
276 | __WALL for systems where that is not available. */ | |
277 | ||
278 | static int | |
279 | my_waitpid (int pid, int *status, int flags) | |
280 | { | |
281 | int ret, out_errno; | |
282 | ||
283 | if (debug_threads) | |
284 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
285 | ||
286 | if (flags & __WALL) | |
287 | { | |
288 | sigset_t block_mask, org_mask, wake_mask; | |
289 | int wnohang; | |
290 | ||
291 | wnohang = (flags & WNOHANG) != 0; | |
292 | flags &= ~(__WALL | __WCLONE); | |
293 | flags |= WNOHANG; | |
294 | ||
295 | /* Block all signals while here. This avoids knowing about | |
296 | LinuxThread's signals. */ | |
297 | sigfillset (&block_mask); | |
298 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
299 | ||
300 | /* ... except during the sigsuspend below. */ | |
301 | sigemptyset (&wake_mask); | |
302 | ||
303 | while (1) | |
304 | { | |
305 | /* Since all signals are blocked, there's no need to check | |
306 | for EINTR here. */ | |
307 | ret = waitpid (pid, status, flags); | |
308 | out_errno = errno; | |
309 | ||
310 | if (ret == -1 && out_errno != ECHILD) | |
311 | break; | |
312 | else if (ret > 0) | |
313 | break; | |
314 | ||
315 | if (flags & __WCLONE) | |
316 | { | |
317 | /* We've tried both flavors now. If WNOHANG is set, | |
318 | there's nothing else to do, just bail out. */ | |
319 | if (wnohang) | |
320 | break; | |
321 | ||
322 | if (debug_threads) | |
323 | fprintf (stderr, "blocking\n"); | |
324 | ||
325 | /* Block waiting for signals. */ | |
326 | sigsuspend (&wake_mask); | |
327 | } | |
328 | ||
329 | flags ^= __WCLONE; | |
330 | } | |
331 | ||
332 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
333 | } | |
334 | else | |
335 | { | |
336 | do | |
337 | ret = waitpid (pid, status, flags); | |
338 | while (ret == -1 && errno == EINTR); | |
339 | out_errno = errno; | |
340 | } | |
341 | ||
342 | if (debug_threads) | |
343 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
344 | pid, flags, status ? *status : -1, ret); | |
345 | ||
346 | errno = out_errno; | |
347 | return ret; | |
348 | } | |
349 | ||
bd99dc85 PA |
350 | /* Handle a GNU/Linux extended wait response. If we see a clone |
351 | event, we need to add the new LWP to our list (and not report the | |
352 | trap to higher layers). */ | |
0d62e5e8 | 353 | |
24a09b5f | 354 | static void |
54a0b537 | 355 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
356 | { |
357 | int event = wstat >> 16; | |
54a0b537 | 358 | struct lwp_info *new_lwp; |
24a09b5f DJ |
359 | |
360 | if (event == PTRACE_EVENT_CLONE) | |
361 | { | |
95954743 | 362 | ptid_t ptid; |
24a09b5f | 363 | unsigned long new_pid; |
836acd6d | 364 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 365 | |
bd99dc85 | 366 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
367 | |
368 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
369 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
370 | { | |
371 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
372 | hits the SIGSTOP, but we're already attached. */ | |
373 | ||
97438e3f | 374 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
375 | |
376 | if (ret == -1) | |
377 | perror_with_name ("waiting for new child"); | |
378 | else if (ret != new_pid) | |
379 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 380 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
381 | warning ("wait returned unexpected status 0x%x", status); |
382 | } | |
383 | ||
384 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE); | |
385 | ||
95954743 PA |
386 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
387 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
388 | add_thread (ptid, new_lwp); | |
24a09b5f | 389 | |
e27d73f6 DE |
390 | /* Either we're going to immediately resume the new thread |
391 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
392 | thinks the thread is currently running, so set this first | |
393 | before calling linux_resume_one_lwp. */ | |
394 | new_lwp->stopped = 1; | |
395 | ||
da5898ce DJ |
396 | /* Normally we will get the pending SIGSTOP. But in some cases |
397 | we might get another signal delivered to the group first. | |
f21cc1a2 | 398 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
399 | if (WSTOPSIG (status) == SIGSTOP) |
400 | { | |
e27d73f6 DE |
401 | if (! stopping_threads) |
402 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); | |
da5898ce | 403 | } |
24a09b5f | 404 | else |
da5898ce | 405 | { |
54a0b537 | 406 | new_lwp->stop_expected = 1; |
da5898ce DJ |
407 | if (stopping_threads) |
408 | { | |
54a0b537 PA |
409 | new_lwp->status_pending_p = 1; |
410 | new_lwp->status_pending = status; | |
da5898ce DJ |
411 | } |
412 | else | |
413 | /* Pass the signal on. This is what GDB does - except | |
414 | shouldn't we really report it instead? */ | |
e27d73f6 | 415 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 416 | } |
24a09b5f DJ |
417 | |
418 | /* Always resume the current thread. If we are stopping | |
419 | threads, it will have a pending SIGSTOP; we may as well | |
420 | collect it now. */ | |
2acc282a | 421 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
422 | } |
423 | } | |
424 | ||
0d62e5e8 DJ |
425 | /* This function should only be called if the process got a SIGTRAP. |
426 | The SIGTRAP could mean several things. | |
427 | ||
428 | On i386, where decr_pc_after_break is non-zero: | |
429 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
430 | we will get only the one SIGTRAP (even if the instruction we | |
431 | stepped over was a breakpoint). The value of $eip will be the | |
432 | next instruction. | |
433 | If we continue the process using PTRACE_CONT, we will get a | |
434 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
435 | the instruction after the breakpoint (i.e. needs to be | |
436 | decremented). If we report the SIGTRAP to GDB, we must also | |
437 | report the undecremented PC. If we cancel the SIGTRAP, we | |
438 | must resume at the decremented PC. | |
439 | ||
440 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
441 | with hardware or kernel single-step: | |
442 | If we single-step over a breakpoint instruction, our PC will | |
443 | point at the following instruction. If we continue and hit a | |
444 | breakpoint instruction, our PC will point at the breakpoint | |
445 | instruction. */ | |
446 | ||
447 | static CORE_ADDR | |
448 | get_stop_pc (void) | |
449 | { | |
450 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
451 | ||
47c0c975 DE |
452 | if (! get_thread_lwp (current_inferior)->stepping) |
453 | stop_pc -= the_low_target.decr_pc_after_break; | |
454 | ||
455 | if (debug_threads) | |
456 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
457 | ||
458 | return stop_pc; | |
0d62e5e8 | 459 | } |
ce3a066d | 460 | |
0d62e5e8 | 461 | static void * |
95954743 | 462 | add_lwp (ptid_t ptid) |
611cb4a5 | 463 | { |
54a0b537 | 464 | struct lwp_info *lwp; |
0d62e5e8 | 465 | |
54a0b537 PA |
466 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
467 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 468 | |
95954743 | 469 | lwp->head.id = ptid; |
0d62e5e8 | 470 | |
aa5ca48f DE |
471 | if (the_low_target.new_thread != NULL) |
472 | lwp->arch_private = the_low_target.new_thread (); | |
473 | ||
54a0b537 | 474 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 475 | |
54a0b537 | 476 | return lwp; |
0d62e5e8 | 477 | } |
611cb4a5 | 478 | |
da6d8c04 DJ |
479 | /* Start an inferior process and returns its pid. |
480 | ALLARGS is a vector of program-name and args. */ | |
481 | ||
ce3a066d DJ |
482 | static int |
483 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 484 | { |
a6dbe5df | 485 | struct lwp_info *new_lwp; |
da6d8c04 | 486 | int pid; |
95954743 | 487 | ptid_t ptid; |
da6d8c04 | 488 | |
42c81e2a | 489 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
490 | pid = vfork (); |
491 | #else | |
da6d8c04 | 492 | pid = fork (); |
52fb6437 | 493 | #endif |
da6d8c04 DJ |
494 | if (pid < 0) |
495 | perror_with_name ("fork"); | |
496 | ||
497 | if (pid == 0) | |
498 | { | |
499 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
500 | ||
254787d4 | 501 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 502 | |
a9fa9f7d DJ |
503 | setpgid (0, 0); |
504 | ||
2b876972 DJ |
505 | execv (program, allargs); |
506 | if (errno == ENOENT) | |
507 | execvp (program, allargs); | |
da6d8c04 DJ |
508 | |
509 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 510 | strerror (errno)); |
da6d8c04 DJ |
511 | fflush (stderr); |
512 | _exit (0177); | |
513 | } | |
514 | ||
95954743 PA |
515 | linux_add_process (pid, 0); |
516 | ||
517 | ptid = ptid_build (pid, pid, 0); | |
518 | new_lwp = add_lwp (ptid); | |
519 | add_thread (ptid, new_lwp); | |
a6dbe5df | 520 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 521 | |
a9fa9f7d | 522 | return pid; |
da6d8c04 DJ |
523 | } |
524 | ||
525 | /* Attach to an inferior process. */ | |
526 | ||
95954743 PA |
527 | static void |
528 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 529 | { |
95954743 | 530 | ptid_t ptid; |
54a0b537 | 531 | struct lwp_info *new_lwp; |
611cb4a5 | 532 | |
95954743 | 533 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 534 | { |
95954743 | 535 | if (!initial) |
2d717e4f DJ |
536 | { |
537 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 538 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
539 | strerror (errno), errno); |
540 | fflush (stderr); | |
541 | return; | |
542 | } | |
543 | else | |
544 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 545 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 546 | strerror (errno), errno); |
da6d8c04 DJ |
547 | } |
548 | ||
95954743 PA |
549 | if (initial) |
550 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
551 | ptid = ptid_build (lwpid, lwpid, 0); | |
552 | else | |
553 | { | |
554 | /* Note that extracting the pid from the current inferior is | |
555 | safe, since we're always called in the context of the same | |
556 | process as this new thread. */ | |
557 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
558 | ptid = ptid_build (pid, lwpid, 0); | |
559 | } | |
24a09b5f | 560 | |
95954743 PA |
561 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
562 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 563 | |
a6dbe5df PA |
564 | /* We need to wait for SIGSTOP before being able to make the next |
565 | ptrace call on this LWP. */ | |
566 | new_lwp->must_set_ptrace_flags = 1; | |
567 | ||
0d62e5e8 | 568 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
569 | brings it to a halt. |
570 | ||
571 | There are several cases to consider here: | |
572 | ||
573 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 PA |
574 | of a new thread that is being created. |
575 | In this case we should ignore that SIGSTOP and resume the process. | |
576 | This is handled below by setting stop_expected = 1. | |
0e21c1ec DE |
577 | |
578 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
579 | to it via attach_inferior. |
580 | In this case we want the process thread to stop. | |
581 | This is handled by having linux_attach clear stop_expected after | |
582 | we return. | |
583 | ??? If the process already has several threads we leave the other | |
584 | threads running. | |
0e21c1ec DE |
585 | |
586 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
587 | existing threads. |
588 | In this case we want the thread to stop. | |
589 | FIXME: This case is currently not properly handled. | |
590 | We should wait for the SIGSTOP but don't. Things work apparently | |
591 | because enough time passes between when we ptrace (ATTACH) and when | |
592 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
593 | |
594 | On the other hand, if we are currently trying to stop all threads, we | |
595 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 596 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
597 | end of the list, and so the new thread has not yet reached |
598 | wait_for_sigstop (but will). */ | |
0d62e5e8 | 599 | if (! stopping_threads) |
54a0b537 | 600 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
601 | } |
602 | ||
95954743 PA |
603 | void |
604 | linux_attach_lwp (unsigned long lwpid) | |
605 | { | |
606 | linux_attach_lwp_1 (lwpid, 0); | |
607 | } | |
608 | ||
0d62e5e8 | 609 | int |
a1928bad | 610 | linux_attach (unsigned long pid) |
0d62e5e8 | 611 | { |
54a0b537 | 612 | struct lwp_info *lwp; |
0d62e5e8 | 613 | |
95954743 PA |
614 | linux_attach_lwp_1 (pid, 1); |
615 | ||
616 | linux_add_process (pid, 1); | |
0d62e5e8 | 617 | |
bd99dc85 PA |
618 | if (!non_stop) |
619 | { | |
620 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
621 | process. It will be collected by wait shortly. */ | |
95954743 PA |
622 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
623 | ptid_build (pid, pid, 0)); | |
bd99dc85 PA |
624 | lwp->stop_expected = 0; |
625 | } | |
0d62e5e8 | 626 | |
95954743 PA |
627 | return 0; |
628 | } | |
629 | ||
630 | struct counter | |
631 | { | |
632 | int pid; | |
633 | int count; | |
634 | }; | |
635 | ||
636 | static int | |
637 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
638 | { | |
639 | struct counter *counter = args; | |
640 | ||
641 | if (ptid_get_pid (entry->id) == counter->pid) | |
642 | { | |
643 | if (++counter->count > 1) | |
644 | return 1; | |
645 | } | |
d61ddec4 | 646 | |
da6d8c04 DJ |
647 | return 0; |
648 | } | |
649 | ||
95954743 PA |
650 | static int |
651 | last_thread_of_process_p (struct thread_info *thread) | |
652 | { | |
653 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
654 | int pid = ptid_get_pid (ptid); | |
655 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 656 | |
95954743 PA |
657 | return (find_inferior (&all_threads, |
658 | second_thread_of_pid_p, &counter) == NULL); | |
659 | } | |
660 | ||
661 | /* Kill the inferior lwp. */ | |
662 | ||
663 | static int | |
664 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 665 | { |
0d62e5e8 | 666 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 667 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 668 | int wstat; |
95954743 PA |
669 | int pid = * (int *) args; |
670 | ||
671 | if (ptid_get_pid (entry->id) != pid) | |
672 | return 0; | |
0d62e5e8 | 673 | |
fd500816 DJ |
674 | /* We avoid killing the first thread here, because of a Linux kernel (at |
675 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
676 | the children get a chance to be reaped, it will remain a zombie | |
677 | forever. */ | |
95954743 | 678 | |
12b42a12 | 679 | if (lwpid_of (lwp) == pid) |
95954743 PA |
680 | { |
681 | if (debug_threads) | |
682 | fprintf (stderr, "lkop: is last of process %s\n", | |
683 | target_pid_to_str (entry->id)); | |
684 | return 0; | |
685 | } | |
fd500816 | 686 | |
bd99dc85 PA |
687 | /* If we're killing a running inferior, make sure it is stopped |
688 | first, as PTRACE_KILL will not work otherwise. */ | |
689 | if (!lwp->stopped) | |
690 | send_sigstop (&lwp->head); | |
691 | ||
0d62e5e8 DJ |
692 | do |
693 | { | |
bd99dc85 | 694 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
695 | |
696 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 697 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 698 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
699 | |
700 | return 0; | |
da6d8c04 DJ |
701 | } |
702 | ||
95954743 PA |
703 | static int |
704 | linux_kill (int pid) | |
0d62e5e8 | 705 | { |
95954743 | 706 | struct process_info *process; |
54a0b537 | 707 | struct lwp_info *lwp; |
95954743 | 708 | struct thread_info *thread; |
fd500816 | 709 | int wstat; |
95954743 | 710 | int lwpid; |
fd500816 | 711 | |
95954743 PA |
712 | process = find_process_pid (pid); |
713 | if (process == NULL) | |
714 | return -1; | |
9d606399 | 715 | |
95954743 | 716 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 717 | |
54a0b537 | 718 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 719 | thread in the list, so do so now. */ |
95954743 PA |
720 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
721 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
722 | |
723 | if (debug_threads) | |
95954743 PA |
724 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
725 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
726 | |
727 | /* If we're killing a running inferior, make sure it is stopped | |
728 | first, as PTRACE_KILL will not work otherwise. */ | |
729 | if (!lwp->stopped) | |
730 | send_sigstop (&lwp->head); | |
731 | ||
fd500816 DJ |
732 | do |
733 | { | |
bd99dc85 | 734 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
735 | |
736 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
737 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
738 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 739 | |
bd99dc85 | 740 | delete_lwp (lwp); |
fd7dd3e6 | 741 | linux_remove_process (process, 0); |
95954743 | 742 | return 0; |
0d62e5e8 DJ |
743 | } |
744 | ||
95954743 PA |
745 | static int |
746 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
747 | { |
748 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 749 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
750 | int pid = * (int *) args; |
751 | ||
752 | if (ptid_get_pid (entry->id) != pid) | |
753 | return 0; | |
6ad8ae5c | 754 | |
bd99dc85 PA |
755 | /* If we're detaching from a running inferior, make sure it is |
756 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
757 | if (!lwp->stopped) | |
758 | { | |
95954743 | 759 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
760 | |
761 | stopping_threads = 1; | |
762 | send_sigstop (&lwp->head); | |
763 | ||
764 | /* If this detects a new thread through a clone event, the new | |
765 | thread is appended to the end of the lwp list, so we'll | |
766 | eventually detach from it. */ | |
767 | wait_for_sigstop (&lwp->head); | |
768 | stopping_threads = 0; | |
769 | ||
770 | /* If LWP exits while we're trying to stop it, there's nothing | |
771 | left to do. */ | |
95954743 | 772 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 773 | if (lwp == NULL) |
95954743 | 774 | return 0; |
bd99dc85 PA |
775 | } |
776 | ||
ae13219e DJ |
777 | /* Make sure the process isn't stopped at a breakpoint that's |
778 | no longer there. */ | |
54a0b537 | 779 | check_removed_breakpoint (lwp); |
ae13219e DJ |
780 | |
781 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
782 | sure we take care of that now. This isn't absolutely guaranteed | |
783 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 784 | if (lwp->stop_expected) |
ae13219e | 785 | { |
bd99dc85 | 786 | int wstat; |
ae13219e | 787 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
788 | lwp->stop_expected = 0; |
789 | if (lwp->stopped) | |
2acc282a | 790 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 791 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
792 | } |
793 | ||
794 | /* Flush any pending changes to the process's registers. */ | |
795 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 796 | get_lwp_thread (lwp)); |
ae13219e DJ |
797 | |
798 | /* Finally, let it resume. */ | |
bd99dc85 PA |
799 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
800 | ||
801 | delete_lwp (lwp); | |
95954743 | 802 | return 0; |
6ad8ae5c DJ |
803 | } |
804 | ||
dd6953e1 | 805 | static int |
95954743 | 806 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 807 | { |
95954743 PA |
808 | int *pid_p = args; |
809 | ||
810 | if (ptid_get_pid (entry->id) == *pid_p) | |
811 | return 1; | |
812 | ||
813 | return 0; | |
814 | } | |
815 | ||
816 | static int | |
817 | linux_detach (int pid) | |
818 | { | |
819 | struct process_info *process; | |
820 | ||
821 | process = find_process_pid (pid); | |
822 | if (process == NULL) | |
823 | return -1; | |
824 | ||
825 | current_inferior = | |
826 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
827 | ||
ae13219e | 828 | delete_all_breakpoints (); |
95954743 | 829 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
fd7dd3e6 | 830 | linux_remove_process (process, 1); |
dd6953e1 | 831 | return 0; |
6ad8ae5c DJ |
832 | } |
833 | ||
444d6139 | 834 | static void |
95954743 | 835 | linux_join (int pid) |
444d6139 | 836 | { |
444d6139 | 837 | int status, ret; |
95954743 | 838 | struct process_info *process; |
bd99dc85 | 839 | |
95954743 PA |
840 | process = find_process_pid (pid); |
841 | if (process == NULL) | |
842 | return; | |
444d6139 PA |
843 | |
844 | do { | |
95954743 | 845 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
846 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
847 | break; | |
848 | } while (ret != -1 || errno != ECHILD); | |
849 | } | |
850 | ||
6ad8ae5c | 851 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 852 | static int |
95954743 | 853 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 854 | { |
95954743 PA |
855 | struct lwp_info *lwp = find_lwp_pid (ptid); |
856 | ||
857 | /* We assume we always know if a thread exits. If a whole process | |
858 | exited but we still haven't been able to report it to GDB, we'll | |
859 | hold on to the last lwp of the dead process. */ | |
860 | if (lwp != NULL) | |
861 | return !lwp->dead; | |
0d62e5e8 DJ |
862 | else |
863 | return 0; | |
864 | } | |
865 | ||
866 | /* Return nonzero if this process stopped at a breakpoint which | |
867 | no longer appears to be inserted. Also adjust the PC | |
868 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 869 | static int |
54a0b537 | 870 | check_removed_breakpoint (struct lwp_info *event_child) |
da6d8c04 | 871 | { |
0d62e5e8 DJ |
872 | CORE_ADDR stop_pc; |
873 | struct thread_info *saved_inferior; | |
874 | ||
875 | if (event_child->pending_is_breakpoint == 0) | |
876 | return 0; | |
877 | ||
878 | if (debug_threads) | |
54a0b537 | 879 | fprintf (stderr, "Checking for breakpoint in lwp %ld.\n", |
bd99dc85 | 880 | lwpid_of (event_child)); |
0d62e5e8 DJ |
881 | |
882 | saved_inferior = current_inferior; | |
54a0b537 | 883 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 DJ |
884 | |
885 | stop_pc = get_stop_pc (); | |
886 | ||
887 | /* If the PC has changed since we stopped, then we shouldn't do | |
888 | anything. This happens if, for instance, GDB handled the | |
889 | decr_pc_after_break subtraction itself. */ | |
890 | if (stop_pc != event_child->pending_stop_pc) | |
891 | { | |
892 | if (debug_threads) | |
ae13219e DJ |
893 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
894 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
895 | |
896 | event_child->pending_is_breakpoint = 0; | |
897 | current_inferior = saved_inferior; | |
898 | return 0; | |
899 | } | |
900 | ||
901 | /* If the breakpoint is still there, we will report hitting it. */ | |
902 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
903 | { | |
904 | if (debug_threads) | |
905 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
906 | current_inferior = saved_inferior; | |
907 | return 0; | |
908 | } | |
909 | ||
910 | if (debug_threads) | |
911 | fprintf (stderr, "Removed breakpoint.\n"); | |
912 | ||
913 | /* For decr_pc_after_break targets, here is where we perform the | |
914 | decrement. We go immediately from this function to resuming, | |
915 | and can not safely call get_stop_pc () again. */ | |
916 | if (the_low_target.set_pc != NULL) | |
47c0c975 DE |
917 | { |
918 | if (debug_threads) | |
919 | fprintf (stderr, "Set pc to 0x%lx\n", (long) stop_pc); | |
920 | (*the_low_target.set_pc) (stop_pc); | |
921 | } | |
0d62e5e8 DJ |
922 | |
923 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 924 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
925 | event_child->status_pending_p = 0; |
926 | event_child->status_pending = 0; | |
927 | ||
928 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
929 | return 1; |
930 | } | |
931 | ||
54a0b537 PA |
932 | /* Return 1 if this lwp has an interesting status pending. This |
933 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 934 | static int |
95954743 | 935 | status_pending_p (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 936 | { |
54a0b537 | 937 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 PA |
938 | ptid_t ptid = * (ptid_t *) arg; |
939 | ||
940 | /* Check if we're only interested in events from a specific process | |
941 | or its lwps. */ | |
942 | if (!ptid_equal (minus_one_ptid, ptid) | |
943 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
944 | return 0; | |
0d62e5e8 | 945 | |
bd99dc85 | 946 | if (lwp->status_pending_p && !lwp->suspended) |
54a0b537 | 947 | if (check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
948 | { |
949 | /* This thread was stopped at a breakpoint, and the breakpoint | |
950 | is now gone. We were told to continue (or step...) all threads, | |
951 | so GDB isn't trying to single-step past this breakpoint. | |
952 | So instead of reporting the old SIGTRAP, pretend we got to | |
953 | the breakpoint just after it was removed instead of just | |
954 | before; resume the process. */ | |
2acc282a | 955 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
0d62e5e8 DJ |
956 | return 0; |
957 | } | |
958 | ||
bd99dc85 | 959 | return (lwp->status_pending_p && !lwp->suspended); |
0d62e5e8 DJ |
960 | } |
961 | ||
95954743 PA |
962 | static int |
963 | same_lwp (struct inferior_list_entry *entry, void *data) | |
964 | { | |
965 | ptid_t ptid = *(ptid_t *) data; | |
966 | int lwp; | |
967 | ||
968 | if (ptid_get_lwp (ptid) != 0) | |
969 | lwp = ptid_get_lwp (ptid); | |
970 | else | |
971 | lwp = ptid_get_pid (ptid); | |
972 | ||
973 | if (ptid_get_lwp (entry->id) == lwp) | |
974 | return 1; | |
975 | ||
976 | return 0; | |
977 | } | |
978 | ||
979 | struct lwp_info * | |
980 | find_lwp_pid (ptid_t ptid) | |
981 | { | |
982 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
983 | } | |
984 | ||
bd99dc85 | 985 | static struct lwp_info * |
95954743 | 986 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 987 | { |
0d62e5e8 | 988 | int ret; |
95954743 | 989 | int to_wait_for = -1; |
bd99dc85 | 990 | struct lwp_info *child = NULL; |
0d62e5e8 | 991 | |
bd99dc85 | 992 | if (debug_threads) |
95954743 PA |
993 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
994 | ||
995 | if (ptid_equal (ptid, minus_one_ptid)) | |
996 | to_wait_for = -1; /* any child */ | |
997 | else | |
998 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 999 | |
bd99dc85 | 1000 | options |= __WALL; |
0d62e5e8 | 1001 | |
bd99dc85 | 1002 | retry: |
0d62e5e8 | 1003 | |
bd99dc85 PA |
1004 | ret = my_waitpid (to_wait_for, wstatp, options); |
1005 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1006 | return NULL; | |
1007 | else if (ret == -1) | |
1008 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1009 | |
1010 | if (debug_threads | |
1011 | && (!WIFSTOPPED (*wstatp) | |
1012 | || (WSTOPSIG (*wstatp) != 32 | |
1013 | && WSTOPSIG (*wstatp) != 33))) | |
1014 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1015 | ||
95954743 | 1016 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1017 | |
24a09b5f DJ |
1018 | /* If we didn't find a process, one of two things presumably happened: |
1019 | - A process we started and then detached from has exited. Ignore it. | |
1020 | - A process we are controlling has forked and the new child's stop | |
1021 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1022 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1023 | { |
1024 | add_pid_to_list (&stopped_pids, ret); | |
1025 | goto retry; | |
1026 | } | |
bd99dc85 | 1027 | else if (child == NULL) |
24a09b5f DJ |
1028 | goto retry; |
1029 | ||
bd99dc85 PA |
1030 | child->stopped = 1; |
1031 | child->pending_is_breakpoint = 0; | |
0d62e5e8 | 1032 | |
bd99dc85 | 1033 | child->last_status = *wstatp; |
32ca6d61 | 1034 | |
d61ddec4 UW |
1035 | /* Architecture-specific setup after inferior is running. |
1036 | This needs to happen after we have attached to the inferior | |
1037 | and it is stopped for the first time, but before we access | |
1038 | any inferior registers. */ | |
1039 | if (new_inferior) | |
1040 | { | |
1041 | the_low_target.arch_setup (); | |
52fa2412 UW |
1042 | #ifdef HAVE_LINUX_REGSETS |
1043 | memset (disabled_regsets, 0, num_regsets); | |
1044 | #endif | |
d61ddec4 UW |
1045 | new_inferior = 0; |
1046 | } | |
1047 | ||
0d62e5e8 | 1048 | if (debug_threads |
47c0c975 DE |
1049 | && WIFSTOPPED (*wstatp) |
1050 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1051 | { |
896c7fbb | 1052 | struct thread_info *saved_inferior = current_inferior; |
47c0c975 DE |
1053 | CORE_ADDR pc; |
1054 | ||
0d62e5e8 | 1055 | current_inferior = (struct thread_info *) |
95954743 | 1056 | find_inferior_id (&all_threads, child->head.id); |
47c0c975 DE |
1057 | pc = (*the_low_target.get_pc) (); |
1058 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); | |
896c7fbb | 1059 | current_inferior = saved_inferior; |
0d62e5e8 | 1060 | } |
bd99dc85 PA |
1061 | |
1062 | return child; | |
0d62e5e8 | 1063 | } |
611cb4a5 | 1064 | |
bd99dc85 PA |
1065 | /* Wait for an event from child PID. If PID is -1, wait for any |
1066 | child. Store the stop status through the status pointer WSTAT. | |
1067 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1068 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1069 | the stopped child otherwise. */ | |
1070 | ||
0d62e5e8 | 1071 | static int |
95954743 | 1072 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 DJ |
1073 | { |
1074 | CORE_ADDR stop_pc; | |
bd99dc85 | 1075 | struct lwp_info *event_child = NULL; |
b65d95c5 | 1076 | int bp_status; |
bd99dc85 | 1077 | struct lwp_info *requested_child = NULL; |
0d62e5e8 | 1078 | |
95954743 | 1079 | /* Check for a lwp with a pending status. */ |
0d62e5e8 DJ |
1080 | /* It is possible that the user changed the pending task's registers since |
1081 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 1082 | (in check_removed_breakpoint); signals should be reported anyway. */ |
bd99dc85 | 1083 | |
95954743 PA |
1084 | if (ptid_equal (ptid, minus_one_ptid) |
1085 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1086 | { |
54a0b537 | 1087 | event_child = (struct lwp_info *) |
95954743 | 1088 | find_inferior (&all_lwps, status_pending_p, &ptid); |
0d62e5e8 | 1089 | if (debug_threads && event_child) |
bd99dc85 | 1090 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1091 | } |
1092 | else | |
1093 | { | |
95954743 | 1094 | requested_child = find_lwp_pid (ptid); |
bd99dc85 PA |
1095 | if (requested_child->status_pending_p |
1096 | && !check_removed_breakpoint (requested_child)) | |
1097 | event_child = requested_child; | |
0d62e5e8 | 1098 | } |
611cb4a5 | 1099 | |
0d62e5e8 DJ |
1100 | if (event_child != NULL) |
1101 | { | |
bd99dc85 PA |
1102 | if (debug_threads) |
1103 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1104 | lwpid_of (event_child), event_child->status_pending); | |
1105 | *wstat = event_child->status_pending; | |
1106 | event_child->status_pending_p = 0; | |
1107 | event_child->status_pending = 0; | |
1108 | current_inferior = get_lwp_thread (event_child); | |
1109 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1110 | } |
1111 | ||
1112 | /* We only enter this loop if no process has a pending wait status. Thus | |
1113 | any action taken in response to a wait status inside this loop is | |
1114 | responding as soon as we detect the status, not after any pending | |
1115 | events. */ | |
1116 | while (1) | |
1117 | { | |
95954743 | 1118 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1119 | |
bd99dc85 PA |
1120 | if ((options & WNOHANG) && event_child == NULL) |
1121 | return 0; | |
0d62e5e8 DJ |
1122 | |
1123 | if (event_child == NULL) | |
1124 | error ("event from unknown child"); | |
611cb4a5 | 1125 | |
bd99dc85 | 1126 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1127 | |
89be2091 | 1128 | /* Check for thread exit. */ |
bd99dc85 | 1129 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1130 | { |
89be2091 | 1131 | if (debug_threads) |
95954743 | 1132 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1133 | |
1134 | /* If the last thread is exiting, just return. */ | |
95954743 | 1135 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1136 | { |
1137 | if (debug_threads) | |
95954743 PA |
1138 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1139 | lwpid_of (event_child)); | |
bd99dc85 PA |
1140 | return lwpid_of (event_child); |
1141 | } | |
89be2091 | 1142 | |
bd99dc85 | 1143 | delete_lwp (event_child); |
89be2091 | 1144 | |
bd99dc85 PA |
1145 | if (!non_stop) |
1146 | { | |
1147 | current_inferior = (struct thread_info *) all_threads.head; | |
1148 | if (debug_threads) | |
1149 | fprintf (stderr, "Current inferior is now %ld\n", | |
1150 | lwpid_of (get_thread_lwp (current_inferior))); | |
1151 | } | |
1152 | else | |
1153 | { | |
1154 | current_inferior = NULL; | |
1155 | if (debug_threads) | |
1156 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1157 | } | |
89be2091 DJ |
1158 | |
1159 | /* If we were waiting for this particular child to do something... | |
1160 | well, it did something. */ | |
bd99dc85 | 1161 | if (requested_child != NULL) |
95954743 | 1162 | return lwpid_of (event_child); |
89be2091 DJ |
1163 | |
1164 | /* Wait for a more interesting event. */ | |
1165 | continue; | |
1166 | } | |
1167 | ||
a6dbe5df PA |
1168 | if (event_child->must_set_ptrace_flags) |
1169 | { | |
1170 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
1171 | 0, PTRACE_O_TRACECLONE); | |
1172 | event_child->must_set_ptrace_flags = 0; | |
1173 | } | |
1174 | ||
bd99dc85 PA |
1175 | if (WIFSTOPPED (*wstat) |
1176 | && WSTOPSIG (*wstat) == SIGSTOP | |
89be2091 DJ |
1177 | && event_child->stop_expected) |
1178 | { | |
1179 | if (debug_threads) | |
1180 | fprintf (stderr, "Expected stop.\n"); | |
1181 | event_child->stop_expected = 0; | |
2acc282a | 1182 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
89be2091 DJ |
1183 | continue; |
1184 | } | |
1185 | ||
bd99dc85 PA |
1186 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1187 | && *wstat >> 16 != 0) | |
24a09b5f | 1188 | { |
bd99dc85 | 1189 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1190 | continue; |
1191 | } | |
1192 | ||
89be2091 DJ |
1193 | /* If GDB is not interested in this signal, don't stop other |
1194 | threads, and don't report it to GDB. Just resume the | |
1195 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1196 | signals as well as any that GDB specifically requested we |
1197 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1198 | and do not ignore signals when stepping - they may require | |
1199 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1200 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1201 | thread library? */ | |
bd99dc85 | 1202 | if (WIFSTOPPED (*wstat) |
69f223ed | 1203 | && !event_child->stepping |
24a09b5f DJ |
1204 | && ( |
1205 | #ifdef USE_THREAD_DB | |
cdbfd419 | 1206 | (current_process ()->private->thread_db != NULL |
bd99dc85 PA |
1207 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1208 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1209 | || |
1210 | #endif | |
bd99dc85 PA |
1211 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
1212 | && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
1213 | { |
1214 | siginfo_t info, *info_p; | |
1215 | ||
1216 | if (debug_threads) | |
24a09b5f | 1217 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1218 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1219 | |
bd99dc85 | 1220 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1221 | info_p = &info; |
1222 | else | |
1223 | info_p = NULL; | |
2acc282a | 1224 | linux_resume_one_lwp (event_child, |
54a0b537 | 1225 | event_child->stepping, |
bd99dc85 | 1226 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1227 | continue; |
0d62e5e8 | 1228 | } |
611cb4a5 | 1229 | |
0d62e5e8 DJ |
1230 | /* If this event was not handled above, and is not a SIGTRAP, report |
1231 | it. */ | |
bd99dc85 PA |
1232 | if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP) |
1233 | return lwpid_of (event_child); | |
611cb4a5 | 1234 | |
0d62e5e8 DJ |
1235 | /* If this target does not support breakpoints, we simply report the |
1236 | SIGTRAP; it's of no concern to us. */ | |
1237 | if (the_low_target.get_pc == NULL) | |
bd99dc85 | 1238 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1239 | |
1240 | stop_pc = get_stop_pc (); | |
1241 | ||
1242 | /* bp_reinsert will only be set if we were single-stepping. | |
1243 | Notice that we will resume the process after hitting | |
1244 | a gdbserver breakpoint; single-stepping to/over one | |
1245 | is not supported (yet). */ | |
1246 | if (event_child->bp_reinsert != 0) | |
1247 | { | |
1248 | if (debug_threads) | |
1249 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
1250 | reinsert_breakpoint (event_child->bp_reinsert); | |
1251 | event_child->bp_reinsert = 0; | |
1252 | ||
1253 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
2acc282a | 1254 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
0d62e5e8 DJ |
1255 | continue; |
1256 | } | |
1257 | ||
b65d95c5 | 1258 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 1259 | |
b65d95c5 | 1260 | if (bp_status != 0) |
0d62e5e8 | 1261 | { |
b65d95c5 DJ |
1262 | if (debug_threads) |
1263 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1264 | ||
0d62e5e8 | 1265 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 1266 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
1267 | adjustment for us at the appropriate time. */ |
1268 | event_child->pending_is_breakpoint = 1; | |
1269 | event_child->pending_stop_pc = stop_pc; | |
1270 | ||
b65d95c5 | 1271 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
1272 | loop instead of simply replacing the breakpoint right away, |
1273 | in order to not lose signals sent to the thread that hit the | |
1274 | breakpoint. Unfortunately this increases the window where another | |
1275 | thread could sneak past the removed breakpoint. For the current | |
1276 | use of server-side breakpoints (thread creation) this is | |
1277 | acceptable; but it needs to be considered before this breakpoint | |
1278 | mechanism can be used in more general ways. For some breakpoints | |
1279 | it may be necessary to stop all other threads, but that should | |
1280 | be avoided where possible. | |
1281 | ||
1282 | If breakpoint_reinsert_addr is NULL, that means that we can | |
1283 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
1284 | mark it for reinsertion, and single-step. | |
1285 | ||
1286 | Otherwise, call the target function to figure out where we need | |
1287 | our temporary breakpoint, create it, and continue executing this | |
1288 | process. */ | |
bd99dc85 PA |
1289 | |
1290 | /* NOTE: we're lifting breakpoints in non-stop mode. This | |
1291 | is currently only used for thread event breakpoints, so | |
1292 | it isn't that bad as long as we have PTRACE_EVENT_CLONE | |
1293 | events. */ | |
b65d95c5 DJ |
1294 | if (bp_status == 2) |
1295 | /* No need to reinsert. */ | |
2acc282a | 1296 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
b65d95c5 | 1297 | else if (the_low_target.breakpoint_reinsert_addr == NULL) |
0d62e5e8 DJ |
1298 | { |
1299 | event_child->bp_reinsert = stop_pc; | |
1300 | uninsert_breakpoint (stop_pc); | |
2acc282a | 1301 | linux_resume_one_lwp (event_child, 1, 0, NULL); |
0d62e5e8 DJ |
1302 | } |
1303 | else | |
1304 | { | |
1305 | reinsert_breakpoint_by_bp | |
1306 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
2acc282a | 1307 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
611cb4a5 | 1308 | } |
0d62e5e8 DJ |
1309 | |
1310 | continue; | |
1311 | } | |
1312 | ||
b65d95c5 DJ |
1313 | if (debug_threads) |
1314 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
1315 | ||
0d62e5e8 | 1316 | /* If we were single-stepping, we definitely want to report the |
c35fafde PA |
1317 | SIGTRAP. Although the single-step operation has completed, |
1318 | do not clear clear the stepping flag yet; we need to check it | |
1319 | in wait_for_sigstop. */ | |
0d62e5e8 | 1320 | if (event_child->stepping) |
bd99dc85 | 1321 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1322 | |
1323 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
1324 | Check if it is a breakpoint, and if so mark the process information | |
1325 | accordingly. This will handle both the necessary fiddling with the | |
1326 | PC on decr_pc_after_break targets and suppressing extra threads | |
1327 | hitting a breakpoint if two hit it at once and then GDB removes it | |
1328 | after the first is reported. Arguably it would be better to report | |
1329 | multiple threads hitting breakpoints simultaneously, but the current | |
1330 | remote protocol does not allow this. */ | |
1331 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
1332 | { | |
1333 | event_child->pending_is_breakpoint = 1; | |
1334 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
1335 | } |
1336 | ||
bd99dc85 | 1337 | return lwpid_of (event_child); |
611cb4a5 | 1338 | } |
0d62e5e8 | 1339 | |
611cb4a5 DJ |
1340 | /* NOTREACHED */ |
1341 | return 0; | |
1342 | } | |
1343 | ||
95954743 PA |
1344 | static int |
1345 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1346 | { | |
1347 | ptid_t wait_ptid; | |
1348 | ||
1349 | if (ptid_is_pid (ptid)) | |
1350 | { | |
1351 | /* A request to wait for a specific tgid. This is not possible | |
1352 | with waitpid, so instead, we wait for any child, and leave | |
1353 | children we're not interested in right now with a pending | |
1354 | status to report later. */ | |
1355 | wait_ptid = minus_one_ptid; | |
1356 | } | |
1357 | else | |
1358 | wait_ptid = ptid; | |
1359 | ||
1360 | while (1) | |
1361 | { | |
1362 | int event_pid; | |
1363 | ||
1364 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1365 | ||
1366 | if (event_pid > 0 | |
1367 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1368 | { | |
1369 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1370 | ||
1371 | if (! WIFSTOPPED (*wstat)) | |
1372 | mark_lwp_dead (event_child, *wstat); | |
1373 | else | |
1374 | { | |
1375 | event_child->status_pending_p = 1; | |
1376 | event_child->status_pending = *wstat; | |
1377 | } | |
1378 | } | |
1379 | else | |
1380 | return event_pid; | |
1381 | } | |
1382 | } | |
1383 | ||
0d62e5e8 | 1384 | /* Wait for process, returns status. */ |
da6d8c04 | 1385 | |
95954743 PA |
1386 | static ptid_t |
1387 | linux_wait_1 (ptid_t ptid, | |
1388 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1389 | { |
e5f1222d | 1390 | int w; |
bd99dc85 PA |
1391 | struct thread_info *thread = NULL; |
1392 | struct lwp_info *lwp = NULL; | |
1393 | int options; | |
bd99dc85 PA |
1394 | int pid; |
1395 | ||
1396 | /* Translate generic target options into linux options. */ | |
1397 | options = __WALL; | |
1398 | if (target_options & TARGET_WNOHANG) | |
1399 | options |= WNOHANG; | |
0d62e5e8 DJ |
1400 | |
1401 | retry: | |
bd99dc85 PA |
1402 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1403 | ||
0d62e5e8 DJ |
1404 | /* If we were only supposed to resume one thread, only wait for |
1405 | that thread - if it's still alive. If it died, however - which | |
1406 | can happen if we're coming from the thread death case below - | |
1407 | then we need to make sure we restart the other threads. We could | |
1408 | pick a thread at random or restart all; restarting all is less | |
1409 | arbitrary. */ | |
95954743 PA |
1410 | if (!non_stop |
1411 | && !ptid_equal (cont_thread, null_ptid) | |
1412 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1413 | { |
bd99dc85 PA |
1414 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1415 | cont_thread); | |
0d62e5e8 DJ |
1416 | |
1417 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1418 | if (thread == NULL) |
64386c31 DJ |
1419 | { |
1420 | struct thread_resume resume_info; | |
95954743 | 1421 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1422 | resume_info.kind = resume_continue; |
1423 | resume_info.sig = 0; | |
2bd7c093 | 1424 | linux_resume (&resume_info, 1); |
64386c31 | 1425 | } |
bd99dc85 | 1426 | else |
95954743 | 1427 | ptid = cont_thread; |
0d62e5e8 | 1428 | } |
da6d8c04 | 1429 | |
95954743 | 1430 | pid = linux_wait_for_event (ptid, &w, options); |
bd99dc85 | 1431 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1432 | return null_ptid; |
bd99dc85 PA |
1433 | |
1434 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1435 | |
0d62e5e8 DJ |
1436 | /* If we are waiting for a particular child, and it exited, |
1437 | linux_wait_for_event will return its exit status. Similarly if | |
1438 | the last child exited. If this is not the last child, however, | |
1439 | do not report it as exited until there is a 'thread exited' response | |
1440 | available in the remote protocol. Instead, just wait for another event. | |
1441 | This should be safe, because if the thread crashed we will already | |
1442 | have reported the termination signal to GDB; that should stop any | |
1443 | in-progress stepping operations, etc. | |
1444 | ||
1445 | Report the exit status of the last thread to exit. This matches | |
1446 | LinuxThreads' behavior. */ | |
1447 | ||
95954743 | 1448 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1449 | { |
bd99dc85 | 1450 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1451 | { |
95954743 PA |
1452 | int pid = pid_of (lwp); |
1453 | struct process_info *process = find_process_pid (pid); | |
5b1c542e | 1454 | |
bd99dc85 | 1455 | delete_lwp (lwp); |
fd7dd3e6 | 1456 | linux_remove_process (process, 0); |
5b1c542e | 1457 | |
bd99dc85 | 1458 | current_inferior = NULL; |
5b1c542e | 1459 | |
bd99dc85 PA |
1460 | if (WIFEXITED (w)) |
1461 | { | |
1462 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1463 | ourstatus->value.integer = WEXITSTATUS (w); | |
1464 | ||
1465 | if (debug_threads) | |
1466 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1467 | } | |
1468 | else | |
1469 | { | |
1470 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1471 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1472 | ||
1473 | if (debug_threads) | |
1474 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1475 | ||
1476 | } | |
5b1c542e | 1477 | |
95954743 | 1478 | return pid_to_ptid (pid); |
0d62e5e8 | 1479 | } |
da6d8c04 | 1480 | } |
0d62e5e8 | 1481 | else |
da6d8c04 | 1482 | { |
0d62e5e8 DJ |
1483 | if (!WIFSTOPPED (w)) |
1484 | goto retry; | |
da6d8c04 DJ |
1485 | } |
1486 | ||
bd99dc85 PA |
1487 | /* In all-stop, stop all threads. Be careful to only do this if |
1488 | we're about to report an event to GDB. */ | |
1489 | if (!non_stop) | |
1490 | stop_all_lwps (); | |
1491 | ||
5b1c542e | 1492 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1493 | |
bd99dc85 PA |
1494 | if (lwp->suspended && WSTOPSIG (w) == SIGSTOP) |
1495 | { | |
1496 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1497 | and it stopped cleanly, so report as SIG0. The use of | |
1498 | SIGSTOP is an implementation detail. */ | |
1499 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1500 | } | |
1501 | else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP) | |
1502 | { | |
1503 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1504 | but, it stopped for other reasons. Set stop_expected so the | |
1505 | pending SIGSTOP is ignored and the LWP is resumed. */ | |
1506 | lwp->stop_expected = 1; | |
1507 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1508 | } | |
1509 | else | |
1510 | { | |
1511 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1512 | } | |
1513 | ||
1514 | if (debug_threads) | |
95954743 PA |
1515 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
1516 | target_pid_to_str (lwp->head.id), | |
bd99dc85 PA |
1517 | ourstatus->kind, |
1518 | ourstatus->value.sig); | |
1519 | ||
95954743 | 1520 | return lwp->head.id; |
bd99dc85 PA |
1521 | } |
1522 | ||
1523 | /* Get rid of any pending event in the pipe. */ | |
1524 | static void | |
1525 | async_file_flush (void) | |
1526 | { | |
1527 | int ret; | |
1528 | char buf; | |
1529 | ||
1530 | do | |
1531 | ret = read (linux_event_pipe[0], &buf, 1); | |
1532 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1533 | } | |
1534 | ||
1535 | /* Put something in the pipe, so the event loop wakes up. */ | |
1536 | static void | |
1537 | async_file_mark (void) | |
1538 | { | |
1539 | int ret; | |
1540 | ||
1541 | async_file_flush (); | |
1542 | ||
1543 | do | |
1544 | ret = write (linux_event_pipe[1], "+", 1); | |
1545 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1546 | ||
1547 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1548 | be awakened anyway. */ | |
1549 | } | |
1550 | ||
95954743 PA |
1551 | static ptid_t |
1552 | linux_wait (ptid_t ptid, | |
1553 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1554 | { |
95954743 | 1555 | ptid_t event_ptid; |
bd99dc85 PA |
1556 | |
1557 | if (debug_threads) | |
95954743 | 1558 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1559 | |
1560 | /* Flush the async file first. */ | |
1561 | if (target_is_async_p ()) | |
1562 | async_file_flush (); | |
1563 | ||
95954743 | 1564 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1565 | |
1566 | /* If at least one stop was reported, there may be more. A single | |
1567 | SIGCHLD can signal more than one child stop. */ | |
1568 | if (target_is_async_p () | |
1569 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1570 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1571 | async_file_mark (); |
1572 | ||
1573 | return event_ptid; | |
da6d8c04 DJ |
1574 | } |
1575 | ||
fd500816 DJ |
1576 | /* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if |
1577 | thread groups are in use, we need to use tkill. */ | |
1578 | ||
1579 | static int | |
a1928bad | 1580 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 DJ |
1581 | { |
1582 | static int tkill_failed; | |
1583 | ||
1584 | errno = 0; | |
1585 | ||
1586 | #ifdef SYS_tkill | |
1587 | if (!tkill_failed) | |
1588 | { | |
1589 | int ret = syscall (SYS_tkill, lwpid, signo); | |
1590 | if (errno != ENOSYS) | |
1b3f6016 | 1591 | return ret; |
fd500816 DJ |
1592 | errno = 0; |
1593 | tkill_failed = 1; | |
1594 | } | |
1595 | #endif | |
1596 | ||
1597 | return kill (lwpid, signo); | |
1598 | } | |
1599 | ||
0d62e5e8 DJ |
1600 | static void |
1601 | send_sigstop (struct inferior_list_entry *entry) | |
1602 | { | |
54a0b537 | 1603 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1604 | int pid; |
0d62e5e8 | 1605 | |
54a0b537 | 1606 | if (lwp->stopped) |
0d62e5e8 DJ |
1607 | return; |
1608 | ||
bd99dc85 PA |
1609 | pid = lwpid_of (lwp); |
1610 | ||
0d62e5e8 DJ |
1611 | /* If we already have a pending stop signal for this process, don't |
1612 | send another. */ | |
54a0b537 | 1613 | if (lwp->stop_expected) |
0d62e5e8 | 1614 | { |
ae13219e | 1615 | if (debug_threads) |
bd99dc85 | 1616 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e DJ |
1617 | |
1618 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1619 | will receive the SIGSTOP event (instead of silently resuming and | |
1620 | waiting again). It'll be reset below. */ | |
54a0b537 | 1621 | lwp->stop_expected = 0; |
0d62e5e8 DJ |
1622 | return; |
1623 | } | |
1624 | ||
1625 | if (debug_threads) | |
bd99dc85 | 1626 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1627 | |
bd99dc85 | 1628 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1629 | } |
1630 | ||
95954743 PA |
1631 | static void |
1632 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
1633 | { | |
1634 | /* It's dead, really. */ | |
1635 | lwp->dead = 1; | |
1636 | ||
1637 | /* Store the exit status for later. */ | |
1638 | lwp->status_pending_p = 1; | |
1639 | lwp->status_pending = wstat; | |
1640 | ||
1641 | /* So that check_removed_breakpoint doesn't try to figure out if | |
1642 | this is stopped at a breakpoint. */ | |
1643 | lwp->pending_is_breakpoint = 0; | |
1644 | ||
1645 | /* Prevent trying to stop it. */ | |
1646 | lwp->stopped = 1; | |
1647 | ||
1648 | /* No further stops are expected from a dead lwp. */ | |
1649 | lwp->stop_expected = 0; | |
1650 | } | |
1651 | ||
0d62e5e8 DJ |
1652 | static void |
1653 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1654 | { | |
54a0b537 | 1655 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1656 | struct thread_info *saved_inferior; |
a1928bad | 1657 | int wstat; |
95954743 PA |
1658 | ptid_t saved_tid; |
1659 | ptid_t ptid; | |
0d62e5e8 | 1660 | |
54a0b537 | 1661 | if (lwp->stopped) |
0d62e5e8 DJ |
1662 | return; |
1663 | ||
1664 | saved_inferior = current_inferior; | |
bd99dc85 PA |
1665 | if (saved_inferior != NULL) |
1666 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1667 | else | |
95954743 | 1668 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 1669 | |
95954743 | 1670 | ptid = lwp->head.id; |
bd99dc85 PA |
1671 | |
1672 | linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
1673 | |
1674 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1675 | and record the pending SIGSTOP. If the process exited, just | |
1676 | return. */ | |
1677 | if (WIFSTOPPED (wstat) | |
1678 | && WSTOPSIG (wstat) != SIGSTOP) | |
1679 | { | |
1680 | if (debug_threads) | |
24a09b5f | 1681 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
bd99dc85 | 1682 | lwpid_of (lwp), wstat); |
c35fafde PA |
1683 | |
1684 | /* Do not leave a pending single-step finish to be reported to | |
1685 | the client. The client will give us a new action for this | |
1686 | thread, possibly a continue request --- otherwise, the client | |
1687 | would consider this pending SIGTRAP reported later a spurious | |
1688 | signal. */ | |
1689 | if (WSTOPSIG (wstat) == SIGTRAP | |
1690 | && lwp->stepping | |
1691 | && !linux_stopped_by_watchpoint ()) | |
1692 | { | |
1693 | if (debug_threads) | |
1694 | fprintf (stderr, " single-step SIGTRAP ignored\n"); | |
1695 | } | |
1696 | else | |
1697 | { | |
1698 | lwp->status_pending_p = 1; | |
1699 | lwp->status_pending = wstat; | |
1700 | } | |
54a0b537 | 1701 | lwp->stop_expected = 1; |
0d62e5e8 | 1702 | } |
95954743 PA |
1703 | else if (!WIFSTOPPED (wstat)) |
1704 | { | |
1705 | if (debug_threads) | |
1706 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
1707 | lwpid_of (lwp)); | |
1708 | ||
1709 | /* Leave this status pending for the next time we're able to | |
1710 | report it. In the mean time, we'll report this lwp as dead | |
1711 | to GDB, so GDB doesn't try to read registers and memory from | |
1712 | it. */ | |
1713 | mark_lwp_dead (lwp, wstat); | |
1714 | } | |
0d62e5e8 | 1715 | |
bd99dc85 | 1716 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
1717 | current_inferior = saved_inferior; |
1718 | else | |
1719 | { | |
1720 | if (debug_threads) | |
1721 | fprintf (stderr, "Previously current thread died.\n"); | |
1722 | ||
bd99dc85 PA |
1723 | if (non_stop) |
1724 | { | |
1725 | /* We can't change the current inferior behind GDB's back, | |
1726 | otherwise, a subsequent command may apply to the wrong | |
1727 | process. */ | |
1728 | current_inferior = NULL; | |
1729 | } | |
1730 | else | |
1731 | { | |
1732 | /* Set a valid thread as current. */ | |
1733 | set_desired_inferior (0); | |
1734 | } | |
0d62e5e8 DJ |
1735 | } |
1736 | } | |
1737 | ||
1738 | static void | |
54a0b537 | 1739 | stop_all_lwps (void) |
0d62e5e8 DJ |
1740 | { |
1741 | stopping_threads = 1; | |
54a0b537 PA |
1742 | for_each_inferior (&all_lwps, send_sigstop); |
1743 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
1744 | stopping_threads = 0; |
1745 | } | |
1746 | ||
da6d8c04 DJ |
1747 | /* Resume execution of the inferior process. |
1748 | If STEP is nonzero, single-step it. | |
1749 | If SIGNAL is nonzero, give it that signal. */ | |
1750 | ||
ce3a066d | 1751 | static void |
2acc282a | 1752 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 1753 | int step, int signal, siginfo_t *info) |
da6d8c04 | 1754 | { |
0d62e5e8 DJ |
1755 | struct thread_info *saved_inferior; |
1756 | ||
54a0b537 | 1757 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
1758 | return; |
1759 | ||
1760 | /* If we have pending signals or status, and a new signal, enqueue the | |
1761 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1762 | breakpoint; it will be picked up again below. */ | |
1763 | if (signal != 0 | |
54a0b537 PA |
1764 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
1765 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
1766 | { |
1767 | struct pending_signals *p_sig; | |
bca929d3 | 1768 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 1769 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 1770 | p_sig->signal = signal; |
32ca6d61 DJ |
1771 | if (info == NULL) |
1772 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1773 | else | |
1774 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 1775 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
1776 | } |
1777 | ||
54a0b537 | 1778 | if (lwp->status_pending_p && !check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
1779 | return; |
1780 | ||
1781 | saved_inferior = current_inferior; | |
54a0b537 | 1782 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
1783 | |
1784 | if (debug_threads) | |
1b3f6016 | 1785 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 1786 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 1787 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
1788 | |
1789 | /* This bit needs some thinking about. If we get a signal that | |
1790 | we must report while a single-step reinsert is still pending, | |
1791 | we often end up resuming the thread. It might be better to | |
1792 | (ew) allow a stack of pending events; then we could be sure that | |
1793 | the reinsert happened right away and not lose any signals. | |
1794 | ||
1795 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 1796 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
1797 | complete correctness, so it won't solve that problem. It may be |
1798 | worthwhile just to solve this one, however. */ | |
54a0b537 | 1799 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
1800 | { |
1801 | if (debug_threads) | |
54a0b537 | 1802 | fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert); |
0d62e5e8 DJ |
1803 | if (step == 0) |
1804 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1805 | step = 1; | |
1806 | ||
1807 | /* Postpone any pending signal. It was enqueued above. */ | |
1808 | signal = 0; | |
1809 | } | |
1810 | ||
54a0b537 | 1811 | check_removed_breakpoint (lwp); |
0d62e5e8 | 1812 | |
aa691b87 | 1813 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 1814 | { |
47c0c975 DE |
1815 | CORE_ADDR pc = (*the_low_target.get_pc) (); |
1816 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); | |
0d62e5e8 DJ |
1817 | } |
1818 | ||
1819 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1820 | a breakpoint. */ | |
54a0b537 | 1821 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
1822 | { |
1823 | struct pending_signals **p_sig; | |
1824 | ||
54a0b537 | 1825 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
1826 | while ((*p_sig)->prev != NULL) |
1827 | p_sig = &(*p_sig)->prev; | |
1828 | ||
1829 | signal = (*p_sig)->signal; | |
32ca6d61 | 1830 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 1831 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 1832 | |
0d62e5e8 DJ |
1833 | free (*p_sig); |
1834 | *p_sig = NULL; | |
1835 | } | |
1836 | ||
aa5ca48f DE |
1837 | if (the_low_target.prepare_to_resume != NULL) |
1838 | the_low_target.prepare_to_resume (lwp); | |
1839 | ||
0d62e5e8 | 1840 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 1841 | get_lwp_thread (lwp)); |
da6d8c04 | 1842 | errno = 0; |
54a0b537 PA |
1843 | lwp->stopped = 0; |
1844 | lwp->stepping = step; | |
bd99dc85 | 1845 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal); |
0d62e5e8 DJ |
1846 | |
1847 | current_inferior = saved_inferior; | |
da6d8c04 | 1848 | if (errno) |
3221518c UW |
1849 | { |
1850 | /* ESRCH from ptrace either means that the thread was already | |
1851 | running (an error) or that it is gone (a race condition). If | |
1852 | it's gone, we will get a notification the next time we wait, | |
1853 | so we can ignore the error. We could differentiate these | |
1854 | two, but it's tricky without waiting; the thread still exists | |
1855 | as a zombie, so sending it signal 0 would succeed. So just | |
1856 | ignore ESRCH. */ | |
1857 | if (errno == ESRCH) | |
1858 | return; | |
1859 | ||
1860 | perror_with_name ("ptrace"); | |
1861 | } | |
da6d8c04 DJ |
1862 | } |
1863 | ||
2bd7c093 PA |
1864 | struct thread_resume_array |
1865 | { | |
1866 | struct thread_resume *resume; | |
1867 | size_t n; | |
1868 | }; | |
64386c31 DJ |
1869 | |
1870 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1871 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1872 | resume request. | |
1873 | ||
1874 | This algorithm is O(threads * resume elements), but resume elements | |
1875 | is small (and will remain small at least until GDB supports thread | |
1876 | suspension). */ | |
2bd7c093 PA |
1877 | static int |
1878 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 1879 | { |
54a0b537 | 1880 | struct lwp_info *lwp; |
64386c31 | 1881 | struct thread_info *thread; |
5544ad89 | 1882 | int ndx; |
2bd7c093 | 1883 | struct thread_resume_array *r; |
64386c31 DJ |
1884 | |
1885 | thread = (struct thread_info *) entry; | |
54a0b537 | 1886 | lwp = get_thread_lwp (thread); |
2bd7c093 | 1887 | r = arg; |
64386c31 | 1888 | |
2bd7c093 | 1889 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
1890 | { |
1891 | ptid_t ptid = r->resume[ndx].thread; | |
1892 | if (ptid_equal (ptid, minus_one_ptid) | |
1893 | || ptid_equal (ptid, entry->id) | |
1894 | || (ptid_is_pid (ptid) | |
1895 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
1896 | || (ptid_get_lwp (ptid) == -1 | |
1897 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
1898 | { | |
1899 | lwp->resume = &r->resume[ndx]; | |
1900 | return 0; | |
1901 | } | |
1902 | } | |
2bd7c093 PA |
1903 | |
1904 | /* No resume action for this thread. */ | |
1905 | lwp->resume = NULL; | |
64386c31 | 1906 | |
2bd7c093 | 1907 | return 0; |
5544ad89 DJ |
1908 | } |
1909 | ||
5544ad89 | 1910 | |
bd99dc85 PA |
1911 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
1912 | static int | |
1913 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 1914 | { |
bd99dc85 | 1915 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 1916 | |
bd99dc85 PA |
1917 | /* LWPs which will not be resumed are not interesting, because |
1918 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 1919 | if (lwp->resume == NULL) |
bd99dc85 | 1920 | return 0; |
64386c31 | 1921 | |
bd99dc85 PA |
1922 | /* If this thread has a removed breakpoint, we won't have any |
1923 | events to report later, so check now. check_removed_breakpoint | |
1924 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1925 | for any thread that we are not otherwise going to resume - this | |
1926 | lets us preserve stopped status when two threads hit a breakpoint. | |
1927 | GDB removes the breakpoint to single-step a particular thread | |
1928 | past it, then re-inserts it and resumes all threads. We want | |
1929 | to report the second thread without resuming it in the interim. */ | |
1930 | if (lwp->status_pending_p) | |
1931 | check_removed_breakpoint (lwp); | |
5544ad89 | 1932 | |
bd99dc85 PA |
1933 | if (lwp->status_pending_p) |
1934 | * (int *) flag_p = 1; | |
c6ecbae5 | 1935 | |
bd99dc85 | 1936 | return 0; |
5544ad89 DJ |
1937 | } |
1938 | ||
1939 | /* This function is called once per thread. We check the thread's resume | |
1940 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 1941 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 1942 | |
bd99dc85 PA |
1943 | For threads which we aren't explicitly told otherwise, we preserve |
1944 | the stepping flag; this is used for stepping over gdbserver-placed | |
1945 | breakpoints. | |
1946 | ||
1947 | If pending_flags was set in any thread, we queue any needed | |
1948 | signals, since we won't actually resume. We already have a pending | |
1949 | event to report, so we don't need to preserve any step requests; | |
1950 | they should be re-issued if necessary. */ | |
1951 | ||
1952 | static int | |
1953 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 1954 | { |
54a0b537 | 1955 | struct lwp_info *lwp; |
5544ad89 | 1956 | struct thread_info *thread; |
bd99dc85 PA |
1957 | int step; |
1958 | int pending_flag = * (int *) arg; | |
5544ad89 DJ |
1959 | |
1960 | thread = (struct thread_info *) entry; | |
54a0b537 | 1961 | lwp = get_thread_lwp (thread); |
5544ad89 | 1962 | |
2bd7c093 | 1963 | if (lwp->resume == NULL) |
bd99dc85 | 1964 | return 0; |
5544ad89 | 1965 | |
bd99dc85 | 1966 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 1967 | { |
bd99dc85 PA |
1968 | if (debug_threads) |
1969 | fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp)); | |
1970 | ||
1971 | if (!lwp->stopped) | |
1972 | { | |
1973 | if (debug_threads) | |
95954743 | 1974 | fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
1975 | |
1976 | lwp->suspended = 1; | |
1977 | send_sigstop (&lwp->head); | |
1978 | } | |
1979 | else | |
1980 | { | |
1981 | if (debug_threads) | |
1982 | { | |
1983 | if (lwp->suspended) | |
1984 | fprintf (stderr, "already stopped/suspended LWP %ld\n", | |
1985 | lwpid_of (lwp)); | |
1986 | else | |
1987 | fprintf (stderr, "already stopped/not suspended LWP %ld\n", | |
1988 | lwpid_of (lwp)); | |
1989 | } | |
32ca6d61 | 1990 | |
bd99dc85 PA |
1991 | /* Make sure we leave the LWP suspended, so we don't try to |
1992 | resume it without GDB telling us to. FIXME: The LWP may | |
1993 | have been stopped in an internal event that was not meant | |
1994 | to be notified back to GDB (e.g., gdbserver breakpoint), | |
1995 | so we should be reporting a stop event in that case | |
1996 | too. */ | |
1997 | lwp->suspended = 1; | |
1998 | } | |
32ca6d61 | 1999 | |
bd99dc85 PA |
2000 | /* For stop requests, we're done. */ |
2001 | lwp->resume = NULL; | |
2002 | return 0; | |
5544ad89 | 2003 | } |
bd99dc85 PA |
2004 | else |
2005 | lwp->suspended = 0; | |
5544ad89 | 2006 | |
bd99dc85 PA |
2007 | /* If this thread which is about to be resumed has a pending status, |
2008 | then don't resume any threads - we can just report the pending | |
2009 | status. Make sure to queue any signals that would otherwise be | |
2010 | sent. In all-stop mode, we do this decision based on if *any* | |
2011 | thread has a pending status. */ | |
2012 | if (non_stop) | |
2013 | resume_status_pending_p (&lwp->head, &pending_flag); | |
5544ad89 | 2014 | |
bd99dc85 PA |
2015 | if (!pending_flag) |
2016 | { | |
2017 | if (debug_threads) | |
2018 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 2019 | |
95954743 | 2020 | if (ptid_equal (lwp->resume->thread, minus_one_ptid) |
bd99dc85 PA |
2021 | && lwp->stepping |
2022 | && lwp->pending_is_breakpoint) | |
2023 | step = 1; | |
2024 | else | |
2025 | step = (lwp->resume->kind == resume_step); | |
5544ad89 | 2026 | |
2acc282a | 2027 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
2028 | } |
2029 | else | |
2030 | { | |
2031 | if (debug_threads) | |
2032 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 2033 | |
bd99dc85 PA |
2034 | /* If we have a new signal, enqueue the signal. */ |
2035 | if (lwp->resume->sig != 0) | |
2036 | { | |
2037 | struct pending_signals *p_sig; | |
2038 | p_sig = xmalloc (sizeof (*p_sig)); | |
2039 | p_sig->prev = lwp->pending_signals; | |
2040 | p_sig->signal = lwp->resume->sig; | |
2041 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2042 | ||
2043 | /* If this is the same signal we were previously stopped by, | |
2044 | make sure to queue its siginfo. We can ignore the return | |
2045 | value of ptrace; if it fails, we'll skip | |
2046 | PTRACE_SETSIGINFO. */ | |
2047 | if (WIFSTOPPED (lwp->last_status) | |
2048 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
2049 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
2050 | ||
2051 | lwp->pending_signals = p_sig; | |
2052 | } | |
2053 | } | |
5544ad89 | 2054 | |
bd99dc85 | 2055 | lwp->resume = NULL; |
5544ad89 | 2056 | return 0; |
0d62e5e8 DJ |
2057 | } |
2058 | ||
2059 | static void | |
2bd7c093 | 2060 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 2061 | { |
5544ad89 | 2062 | int pending_flag; |
2bd7c093 | 2063 | struct thread_resume_array array = { resume_info, n }; |
c6ecbae5 | 2064 | |
2bd7c093 | 2065 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 DJ |
2066 | |
2067 | /* If there is a thread which would otherwise be resumed, which | |
2068 | has a pending status, then don't resume any threads - we can just | |
2069 | report the pending status. Make sure to queue any signals | |
bd99dc85 PA |
2070 | that would otherwise be sent. In non-stop mode, we'll apply this |
2071 | logic to each thread individually. */ | |
5544ad89 | 2072 | pending_flag = 0; |
bd99dc85 PA |
2073 | if (!non_stop) |
2074 | find_inferior (&all_lwps, resume_status_pending_p, &pending_flag); | |
5544ad89 DJ |
2075 | |
2076 | if (debug_threads) | |
2077 | { | |
2078 | if (pending_flag) | |
2079 | fprintf (stderr, "Not resuming, pending status\n"); | |
2080 | else | |
2081 | fprintf (stderr, "Resuming, no pending status\n"); | |
2082 | } | |
2083 | ||
bd99dc85 | 2084 | find_inferior (&all_threads, linux_resume_one_thread, &pending_flag); |
0d62e5e8 DJ |
2085 | } |
2086 | ||
2087 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
2088 | |
2089 | int | |
0a30fbc4 | 2090 | register_addr (int regnum) |
da6d8c04 DJ |
2091 | { |
2092 | int addr; | |
2093 | ||
2ec06d2e | 2094 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
2095 | error ("Invalid register number %d.", regnum); |
2096 | ||
2ec06d2e | 2097 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2098 | |
2099 | return addr; | |
2100 | } | |
2101 | ||
58caa3dc | 2102 | /* Fetch one register. */ |
da6d8c04 DJ |
2103 | static void |
2104 | fetch_register (int regno) | |
2105 | { | |
2106 | CORE_ADDR regaddr; | |
48d93c75 | 2107 | int i, size; |
0d62e5e8 | 2108 | char *buf; |
95954743 | 2109 | int pid; |
da6d8c04 | 2110 | |
2ec06d2e | 2111 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2112 | return; |
2ec06d2e | 2113 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2114 | return; |
da6d8c04 | 2115 | |
0a30fbc4 DJ |
2116 | regaddr = register_addr (regno); |
2117 | if (regaddr == -1) | |
2118 | return; | |
95954743 PA |
2119 | |
2120 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2121 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2122 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2123 | buf = alloca (size); |
2124 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2125 | { |
2126 | errno = 0; | |
0d62e5e8 | 2127 | *(PTRACE_XFER_TYPE *) (buf + i) = |
95954743 | 2128 | ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
da6d8c04 DJ |
2129 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2130 | if (errno != 0) | |
2131 | { | |
2132 | /* Warning, not error, in case we are attached; sometimes the | |
2133 | kernel doesn't let us at the registers. */ | |
2134 | char *err = strerror (errno); | |
2135 | char *msg = alloca (strlen (err) + 128); | |
2136 | sprintf (msg, "reading register %d: %s", regno, err); | |
2137 | error (msg); | |
2138 | goto error_exit; | |
2139 | } | |
2140 | } | |
ee1a7ae4 UW |
2141 | |
2142 | if (the_low_target.supply_ptrace_register) | |
2143 | the_low_target.supply_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2144 | else |
2145 | supply_register (regno, buf); | |
0d62e5e8 | 2146 | |
da6d8c04 DJ |
2147 | error_exit:; |
2148 | } | |
2149 | ||
2150 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
2151 | static void |
2152 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 | 2153 | { |
4463ce24 | 2154 | if (regno == -1) |
2ec06d2e | 2155 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
2156 | fetch_register (regno); |
2157 | else | |
2158 | fetch_register (regno); | |
2159 | } | |
2160 | ||
2161 | /* Store our register values back into the inferior. | |
2162 | If REGNO is -1, do this for all registers. | |
2163 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
2164 | static void |
2165 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
2166 | { |
2167 | CORE_ADDR regaddr; | |
48d93c75 | 2168 | int i, size; |
0d62e5e8 | 2169 | char *buf; |
55ac2b99 | 2170 | int pid; |
da6d8c04 DJ |
2171 | |
2172 | if (regno >= 0) | |
2173 | { | |
2ec06d2e | 2174 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2175 | return; |
2176 | ||
bc1e36ca | 2177 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2178 | return; |
2179 | ||
2180 | regaddr = register_addr (regno); | |
2181 | if (regaddr == -1) | |
da6d8c04 | 2182 | return; |
da6d8c04 | 2183 | errno = 0; |
48d93c75 UW |
2184 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2185 | & - sizeof (PTRACE_XFER_TYPE); | |
2186 | buf = alloca (size); | |
2187 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2188 | |
2189 | if (the_low_target.collect_ptrace_register) | |
2190 | the_low_target.collect_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2191 | else |
2192 | collect_register (regno, buf); | |
ee1a7ae4 | 2193 | |
95954743 | 2194 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2195 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2196 | { |
0a30fbc4 | 2197 | errno = 0; |
95954743 | 2198 | ptrace (PTRACE_POKEUSER, pid, (PTRACE_ARG3_TYPE) regaddr, |
2ff29de4 | 2199 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
2200 | if (errno != 0) |
2201 | { | |
1b3f6016 PA |
2202 | /* At this point, ESRCH should mean the process is |
2203 | already gone, in which case we simply ignore attempts | |
2204 | to change its registers. See also the related | |
2205 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2206 | if (errno == ESRCH) |
2207 | return; | |
2208 | ||
bc1e36ca DJ |
2209 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
2210 | { | |
2211 | char *err = strerror (errno); | |
2212 | char *msg = alloca (strlen (err) + 128); | |
2213 | sprintf (msg, "writing register %d: %s", | |
2214 | regno, err); | |
2215 | error (msg); | |
2216 | return; | |
2217 | } | |
da6d8c04 | 2218 | } |
2ff29de4 | 2219 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2220 | } |
da6d8c04 DJ |
2221 | } |
2222 | else | |
2ec06d2e | 2223 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 2224 | usr_store_inferior_registers (regno); |
da6d8c04 | 2225 | } |
58caa3dc DJ |
2226 | #endif /* HAVE_LINUX_USRREGS */ |
2227 | ||
2228 | ||
2229 | ||
2230 | #ifdef HAVE_LINUX_REGSETS | |
2231 | ||
2232 | static int | |
0d62e5e8 | 2233 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
2234 | { |
2235 | struct regset_info *regset; | |
e9d25b98 | 2236 | int saw_general_regs = 0; |
95954743 | 2237 | int pid; |
58caa3dc DJ |
2238 | |
2239 | regset = target_regsets; | |
2240 | ||
95954743 | 2241 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2242 | while (regset->size >= 0) |
2243 | { | |
2244 | void *buf; | |
2245 | int res; | |
2246 | ||
52fa2412 | 2247 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2248 | { |
2249 | regset ++; | |
2250 | continue; | |
2251 | } | |
2252 | ||
bca929d3 | 2253 | buf = xmalloc (regset->size); |
dfb64f85 | 2254 | #ifndef __sparc__ |
95954743 | 2255 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2256 | #else |
95954743 | 2257 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2258 | #endif |
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 DJ |
2268 | } |
2269 | else | |
2270 | { | |
0d62e5e8 | 2271 | char s[256]; |
95954743 PA |
2272 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
2273 | pid); | |
0d62e5e8 | 2274 | perror (s); |
58caa3dc DJ |
2275 | } |
2276 | } | |
e9d25b98 DJ |
2277 | else if (regset->type == GENERAL_REGS) |
2278 | saw_general_regs = 1; | |
58caa3dc DJ |
2279 | regset->store_function (buf); |
2280 | regset ++; | |
fdeb2a12 | 2281 | free (buf); |
58caa3dc | 2282 | } |
e9d25b98 DJ |
2283 | if (saw_general_regs) |
2284 | return 0; | |
2285 | else | |
2286 | return 1; | |
58caa3dc DJ |
2287 | } |
2288 | ||
2289 | static int | |
0d62e5e8 | 2290 | regsets_store_inferior_registers () |
58caa3dc DJ |
2291 | { |
2292 | struct regset_info *regset; | |
e9d25b98 | 2293 | int saw_general_regs = 0; |
95954743 | 2294 | int pid; |
58caa3dc DJ |
2295 | |
2296 | regset = target_regsets; | |
2297 | ||
95954743 | 2298 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2299 | while (regset->size >= 0) |
2300 | { | |
2301 | void *buf; | |
2302 | int res; | |
2303 | ||
52fa2412 | 2304 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2305 | { |
2306 | regset ++; | |
2307 | continue; | |
2308 | } | |
2309 | ||
bca929d3 | 2310 | buf = xmalloc (regset->size); |
545587ee DJ |
2311 | |
2312 | /* First fill the buffer with the current register set contents, | |
2313 | in case there are any items in the kernel's regset that are | |
2314 | not in gdbserver's regcache. */ | |
dfb64f85 | 2315 | #ifndef __sparc__ |
95954743 | 2316 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2317 | #else |
95954743 | 2318 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2319 | #endif |
545587ee DJ |
2320 | |
2321 | if (res == 0) | |
2322 | { | |
2323 | /* Then overlay our cached registers on that. */ | |
2324 | regset->fill_function (buf); | |
2325 | ||
2326 | /* Only now do we write the register set. */ | |
dfb64f85 | 2327 | #ifndef __sparc__ |
95954743 | 2328 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 2329 | #else |
95954743 | 2330 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 2331 | #endif |
545587ee DJ |
2332 | } |
2333 | ||
58caa3dc DJ |
2334 | if (res < 0) |
2335 | { | |
2336 | if (errno == EIO) | |
2337 | { | |
52fa2412 UW |
2338 | /* If we get EIO on a regset, do not try it again for |
2339 | this process. */ | |
2340 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2341 | free (buf); |
52fa2412 | 2342 | continue; |
58caa3dc | 2343 | } |
3221518c UW |
2344 | else if (errno == ESRCH) |
2345 | { | |
1b3f6016 PA |
2346 | /* At this point, ESRCH should mean the process is |
2347 | already gone, in which case we simply ignore attempts | |
2348 | to change its registers. See also the related | |
2349 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 2350 | free (buf); |
3221518c UW |
2351 | return 0; |
2352 | } | |
58caa3dc DJ |
2353 | else |
2354 | { | |
ce3a066d | 2355 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
2356 | } |
2357 | } | |
e9d25b98 DJ |
2358 | else if (regset->type == GENERAL_REGS) |
2359 | saw_general_regs = 1; | |
58caa3dc | 2360 | regset ++; |
09ec9b38 | 2361 | free (buf); |
58caa3dc | 2362 | } |
e9d25b98 DJ |
2363 | if (saw_general_regs) |
2364 | return 0; | |
2365 | else | |
2366 | return 1; | |
ce3a066d | 2367 | return 0; |
58caa3dc DJ |
2368 | } |
2369 | ||
2370 | #endif /* HAVE_LINUX_REGSETS */ | |
2371 | ||
2372 | ||
2373 | void | |
ce3a066d | 2374 | linux_fetch_registers (int regno) |
58caa3dc DJ |
2375 | { |
2376 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2377 | if (regsets_fetch_inferior_registers () == 0) |
2378 | return; | |
58caa3dc DJ |
2379 | #endif |
2380 | #ifdef HAVE_LINUX_USRREGS | |
2381 | usr_fetch_inferior_registers (regno); | |
2382 | #endif | |
2383 | } | |
2384 | ||
2385 | void | |
ce3a066d | 2386 | linux_store_registers (int regno) |
58caa3dc DJ |
2387 | { |
2388 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2389 | if (regsets_store_inferior_registers () == 0) |
2390 | return; | |
58caa3dc DJ |
2391 | #endif |
2392 | #ifdef HAVE_LINUX_USRREGS | |
2393 | usr_store_inferior_registers (regno); | |
2394 | #endif | |
2395 | } | |
2396 | ||
da6d8c04 | 2397 | |
da6d8c04 DJ |
2398 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
2399 | to debugger memory starting at MYADDR. */ | |
2400 | ||
c3e735a6 | 2401 | static int |
f450004a | 2402 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
2403 | { |
2404 | register int i; | |
2405 | /* Round starting address down to longword boundary. */ | |
2406 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2407 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
2408 | register int count |
2409 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
2410 | / sizeof (PTRACE_XFER_TYPE); |
2411 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 2412 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 2413 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
2414 | int fd; |
2415 | char filename[64]; | |
95954743 | 2416 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
2417 | |
2418 | /* Try using /proc. Don't bother for one word. */ | |
2419 | if (len >= 3 * sizeof (long)) | |
2420 | { | |
2421 | /* We could keep this file open and cache it - possibly one per | |
2422 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 2423 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
2424 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
2425 | if (fd == -1) | |
2426 | goto no_proc; | |
2427 | ||
2428 | /* If pread64 is available, use it. It's faster if the kernel | |
2429 | supports it (only one syscall), and it's 64-bit safe even on | |
2430 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
2431 | application). */ | |
2432 | #ifdef HAVE_PREAD64 | |
2433 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
2434 | #else | |
1de1badb | 2435 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
2436 | #endif |
2437 | { | |
2438 | close (fd); | |
2439 | goto no_proc; | |
2440 | } | |
2441 | ||
2442 | close (fd); | |
2443 | return 0; | |
2444 | } | |
da6d8c04 | 2445 | |
fd462a61 | 2446 | no_proc: |
da6d8c04 DJ |
2447 | /* Read all the longwords */ |
2448 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2449 | { | |
c3e735a6 | 2450 | errno = 0; |
95954743 | 2451 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
c3e735a6 DJ |
2452 | if (errno) |
2453 | return errno; | |
da6d8c04 DJ |
2454 | } |
2455 | ||
2456 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
2457 | memcpy (myaddr, |
2458 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
2459 | len); | |
c3e735a6 DJ |
2460 | |
2461 | return 0; | |
da6d8c04 DJ |
2462 | } |
2463 | ||
2464 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
2465 | to inferior's memory at MEMADDR. | |
2466 | On failure (cannot write the inferior) | |
2467 | returns the value of errno. */ | |
2468 | ||
ce3a066d | 2469 | static int |
f450004a | 2470 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
2471 | { |
2472 | register int i; | |
2473 | /* Round starting address down to longword boundary. */ | |
2474 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2475 | /* Round ending address up; get number of longwords that makes. */ | |
2476 | register int count | |
2477 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
2478 | /* Allocate buffer of that many longwords. */ | |
2479 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 2480 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 2481 | |
0d62e5e8 DJ |
2482 | if (debug_threads) |
2483 | { | |
58d6951d DJ |
2484 | /* Dump up to four bytes. */ |
2485 | unsigned int val = * (unsigned int *) myaddr; | |
2486 | if (len == 1) | |
2487 | val = val & 0xff; | |
2488 | else if (len == 2) | |
2489 | val = val & 0xffff; | |
2490 | else if (len == 3) | |
2491 | val = val & 0xffffff; | |
2492 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
2493 | val, (long)memaddr); | |
0d62e5e8 DJ |
2494 | } |
2495 | ||
da6d8c04 DJ |
2496 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
2497 | ||
95954743 | 2498 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
da6d8c04 DJ |
2499 | |
2500 | if (count > 1) | |
2501 | { | |
2502 | buffer[count - 1] | |
95954743 | 2503 | = ptrace (PTRACE_PEEKTEXT, pid, |
d844cde6 DJ |
2504 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
2505 | * sizeof (PTRACE_XFER_TYPE)), | |
2506 | 0); | |
da6d8c04 DJ |
2507 | } |
2508 | ||
2509 | /* Copy data to be written over corresponding part of buffer */ | |
2510 | ||
2511 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
2512 | ||
2513 | /* Write the entire buffer. */ | |
2514 | ||
2515 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2516 | { | |
2517 | errno = 0; | |
95954743 | 2518 | ptrace (PTRACE_POKETEXT, pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
2519 | if (errno) |
2520 | return errno; | |
2521 | } | |
2522 | ||
2523 | return 0; | |
2524 | } | |
2f2893d9 | 2525 | |
24a09b5f DJ |
2526 | static int linux_supports_tracefork_flag; |
2527 | ||
51c2684e | 2528 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 2529 | |
51c2684e DJ |
2530 | static int |
2531 | linux_tracefork_grandchild (void *arg) | |
2532 | { | |
2533 | _exit (0); | |
2534 | } | |
2535 | ||
7407e2de AS |
2536 | #define STACK_SIZE 4096 |
2537 | ||
51c2684e DJ |
2538 | static int |
2539 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
2540 | { |
2541 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
2542 | kill (getpid (), SIGSTOP); | |
7407e2de AS |
2543 | #ifdef __ia64__ |
2544 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
2545 | CLONE_VM | SIGCHLD, NULL); | |
2546 | #else | |
2547 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
2548 | CLONE_VM | SIGCHLD, NULL); | |
2549 | #endif | |
24a09b5f DJ |
2550 | _exit (0); |
2551 | } | |
2552 | ||
24a09b5f DJ |
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 | } |