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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); |
c35fafde | 137 | static int linux_stopped_by_watchpoint (void); |
95954743 | 138 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
0d62e5e8 DJ |
139 | |
140 | struct pending_signals | |
141 | { | |
142 | int signal; | |
32ca6d61 | 143 | siginfo_t info; |
0d62e5e8 DJ |
144 | struct pending_signals *prev; |
145 | }; | |
611cb4a5 | 146 | |
d844cde6 | 147 | #define PTRACE_ARG3_TYPE long |
c6ecbae5 | 148 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 149 | |
58caa3dc | 150 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
151 | static char *disabled_regsets; |
152 | static int num_regsets; | |
58caa3dc DJ |
153 | #endif |
154 | ||
bd99dc85 PA |
155 | /* The read/write ends of the pipe registered as waitable file in the |
156 | event loop. */ | |
157 | static int linux_event_pipe[2] = { -1, -1 }; | |
158 | ||
159 | /* True if we're currently in async mode. */ | |
160 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
161 | ||
162 | static void send_sigstop (struct inferior_list_entry *entry); | |
163 | static void wait_for_sigstop (struct inferior_list_entry *entry); | |
164 | ||
d0722149 DE |
165 | /* Accepts an integer PID; Returns a string representing a file that |
166 | can be opened to get info for the child process. | |
167 | Space for the result is malloc'd, caller must free. */ | |
168 | ||
169 | char * | |
170 | linux_child_pid_to_exec_file (int pid) | |
171 | { | |
172 | char *name1, *name2; | |
173 | ||
174 | name1 = xmalloc (MAXPATHLEN); | |
175 | name2 = xmalloc (MAXPATHLEN); | |
176 | memset (name2, 0, MAXPATHLEN); | |
177 | ||
178 | sprintf (name1, "/proc/%d/exe", pid); | |
179 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
180 | { | |
181 | free (name1); | |
182 | return name2; | |
183 | } | |
184 | else | |
185 | { | |
186 | free (name2); | |
187 | return name1; | |
188 | } | |
189 | } | |
190 | ||
191 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
192 | ||
193 | static int | |
194 | elf_64_header_p (const Elf64_External_Ehdr *header) | |
195 | { | |
196 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
197 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
198 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
199 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
200 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
201 | } | |
202 | ||
203 | /* Return non-zero if FILE is a 64-bit ELF file, | |
204 | zero if the file is not a 64-bit ELF file, | |
205 | and -1 if the file is not accessible or doesn't exist. */ | |
206 | ||
207 | int | |
208 | elf_64_file_p (const char *file) | |
209 | { | |
210 | Elf64_External_Ehdr header; | |
211 | int fd; | |
212 | ||
213 | fd = open (file, O_RDONLY); | |
214 | if (fd < 0) | |
215 | return -1; | |
216 | ||
217 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
218 | { | |
219 | close (fd); | |
220 | return 0; | |
221 | } | |
222 | close (fd); | |
223 | ||
224 | return elf_64_header_p (&header); | |
225 | } | |
226 | ||
bd99dc85 PA |
227 | static void |
228 | delete_lwp (struct lwp_info *lwp) | |
229 | { | |
230 | remove_thread (get_lwp_thread (lwp)); | |
231 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 232 | free (lwp->arch_private); |
bd99dc85 PA |
233 | free (lwp); |
234 | } | |
235 | ||
95954743 PA |
236 | /* Add a process to the common process list, and set its private |
237 | data. */ | |
238 | ||
239 | static struct process_info * | |
240 | linux_add_process (int pid, int attached) | |
241 | { | |
242 | struct process_info *proc; | |
243 | ||
244 | /* Is this the first process? If so, then set the arch. */ | |
245 | if (all_processes.head == NULL) | |
246 | new_inferior = 1; | |
247 | ||
248 | proc = add_process (pid, attached); | |
249 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
250 | ||
aa5ca48f DE |
251 | if (the_low_target.new_process != NULL) |
252 | proc->private->arch_private = the_low_target.new_process (); | |
253 | ||
95954743 PA |
254 | return proc; |
255 | } | |
256 | ||
5091eb23 DE |
257 | /* Remove a process from the common process list, |
258 | also freeing all private data. */ | |
259 | ||
260 | static void | |
fd7dd3e6 | 261 | linux_remove_process (struct process_info *process, int detaching) |
5091eb23 | 262 | { |
cdbfd419 PP |
263 | struct process_info_private *priv = process->private; |
264 | ||
265 | #ifdef USE_THREAD_DB | |
fd7dd3e6 | 266 | thread_db_free (process, detaching); |
cdbfd419 PP |
267 | #endif |
268 | ||
269 | free (priv->arch_private); | |
270 | free (priv); | |
5091eb23 DE |
271 | remove_process (process); |
272 | } | |
273 | ||
07d4f67e DE |
274 | /* Wrapper function for waitpid which handles EINTR, and emulates |
275 | __WALL for systems where that is not available. */ | |
276 | ||
277 | static int | |
278 | my_waitpid (int pid, int *status, int flags) | |
279 | { | |
280 | int ret, out_errno; | |
281 | ||
282 | if (debug_threads) | |
283 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
284 | ||
285 | if (flags & __WALL) | |
286 | { | |
287 | sigset_t block_mask, org_mask, wake_mask; | |
288 | int wnohang; | |
289 | ||
290 | wnohang = (flags & WNOHANG) != 0; | |
291 | flags &= ~(__WALL | __WCLONE); | |
292 | flags |= WNOHANG; | |
293 | ||
294 | /* Block all signals while here. This avoids knowing about | |
295 | LinuxThread's signals. */ | |
296 | sigfillset (&block_mask); | |
297 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
298 | ||
299 | /* ... except during the sigsuspend below. */ | |
300 | sigemptyset (&wake_mask); | |
301 | ||
302 | while (1) | |
303 | { | |
304 | /* Since all signals are blocked, there's no need to check | |
305 | for EINTR here. */ | |
306 | ret = waitpid (pid, status, flags); | |
307 | out_errno = errno; | |
308 | ||
309 | if (ret == -1 && out_errno != ECHILD) | |
310 | break; | |
311 | else if (ret > 0) | |
312 | break; | |
313 | ||
314 | if (flags & __WCLONE) | |
315 | { | |
316 | /* We've tried both flavors now. If WNOHANG is set, | |
317 | there's nothing else to do, just bail out. */ | |
318 | if (wnohang) | |
319 | break; | |
320 | ||
321 | if (debug_threads) | |
322 | fprintf (stderr, "blocking\n"); | |
323 | ||
324 | /* Block waiting for signals. */ | |
325 | sigsuspend (&wake_mask); | |
326 | } | |
327 | ||
328 | flags ^= __WCLONE; | |
329 | } | |
330 | ||
331 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
332 | } | |
333 | else | |
334 | { | |
335 | do | |
336 | ret = waitpid (pid, status, flags); | |
337 | while (ret == -1 && errno == EINTR); | |
338 | out_errno = errno; | |
339 | } | |
340 | ||
341 | if (debug_threads) | |
342 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
343 | pid, flags, status ? *status : -1, ret); | |
344 | ||
345 | errno = out_errno; | |
346 | return ret; | |
347 | } | |
348 | ||
bd99dc85 PA |
349 | /* Handle a GNU/Linux extended wait response. If we see a clone |
350 | event, we need to add the new LWP to our list (and not report the | |
351 | trap to higher layers). */ | |
0d62e5e8 | 352 | |
24a09b5f | 353 | static void |
54a0b537 | 354 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
355 | { |
356 | int event = wstat >> 16; | |
54a0b537 | 357 | struct lwp_info *new_lwp; |
24a09b5f DJ |
358 | |
359 | if (event == PTRACE_EVENT_CLONE) | |
360 | { | |
95954743 | 361 | ptid_t ptid; |
24a09b5f | 362 | unsigned long new_pid; |
836acd6d | 363 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 364 | |
bd99dc85 | 365 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
366 | |
367 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
368 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
369 | { | |
370 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
371 | hits the SIGSTOP, but we're already attached. */ | |
372 | ||
97438e3f | 373 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
374 | |
375 | if (ret == -1) | |
376 | perror_with_name ("waiting for new child"); | |
377 | else if (ret != new_pid) | |
378 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 379 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
380 | warning ("wait returned unexpected status 0x%x", status); |
381 | } | |
382 | ||
383 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE); | |
384 | ||
95954743 PA |
385 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
386 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
387 | add_thread (ptid, new_lwp); | |
24a09b5f | 388 | |
e27d73f6 DE |
389 | /* Either we're going to immediately resume the new thread |
390 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
391 | thinks the thread is currently running, so set this first | |
392 | before calling linux_resume_one_lwp. */ | |
393 | new_lwp->stopped = 1; | |
394 | ||
da5898ce DJ |
395 | /* Normally we will get the pending SIGSTOP. But in some cases |
396 | we might get another signal delivered to the group first. | |
f21cc1a2 | 397 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
398 | if (WSTOPSIG (status) == SIGSTOP) |
399 | { | |
e27d73f6 DE |
400 | if (! stopping_threads) |
401 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); | |
da5898ce | 402 | } |
24a09b5f | 403 | else |
da5898ce | 404 | { |
54a0b537 | 405 | new_lwp->stop_expected = 1; |
da5898ce DJ |
406 | if (stopping_threads) |
407 | { | |
54a0b537 PA |
408 | new_lwp->status_pending_p = 1; |
409 | new_lwp->status_pending = status; | |
da5898ce DJ |
410 | } |
411 | else | |
412 | /* Pass the signal on. This is what GDB does - except | |
413 | shouldn't we really report it instead? */ | |
e27d73f6 | 414 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 415 | } |
24a09b5f DJ |
416 | |
417 | /* Always resume the current thread. If we are stopping | |
418 | threads, it will have a pending SIGSTOP; we may as well | |
419 | collect it now. */ | |
2acc282a | 420 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
421 | } |
422 | } | |
423 | ||
0d62e5e8 DJ |
424 | /* This function should only be called if the process got a SIGTRAP. |
425 | The SIGTRAP could mean several things. | |
426 | ||
427 | On i386, where decr_pc_after_break is non-zero: | |
428 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
429 | we will get only the one SIGTRAP (even if the instruction we | |
430 | stepped over was a breakpoint). The value of $eip will be the | |
431 | next instruction. | |
432 | If we continue the process using PTRACE_CONT, we will get a | |
433 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
434 | the instruction after the breakpoint (i.e. needs to be | |
435 | decremented). If we report the SIGTRAP to GDB, we must also | |
436 | report the undecremented PC. If we cancel the SIGTRAP, we | |
437 | must resume at the decremented PC. | |
438 | ||
439 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
440 | with hardware or kernel single-step: | |
441 | If we single-step over a breakpoint instruction, our PC will | |
442 | point at the following instruction. If we continue and hit a | |
443 | breakpoint instruction, our PC will point at the breakpoint | |
444 | instruction. */ | |
445 | ||
446 | static CORE_ADDR | |
447 | get_stop_pc (void) | |
448 | { | |
449 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
450 | ||
47c0c975 DE |
451 | if (! get_thread_lwp (current_inferior)->stepping) |
452 | stop_pc -= the_low_target.decr_pc_after_break; | |
453 | ||
454 | if (debug_threads) | |
455 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
456 | ||
457 | return stop_pc; | |
0d62e5e8 | 458 | } |
ce3a066d | 459 | |
0d62e5e8 | 460 | static void * |
95954743 | 461 | add_lwp (ptid_t ptid) |
611cb4a5 | 462 | { |
54a0b537 | 463 | struct lwp_info *lwp; |
0d62e5e8 | 464 | |
54a0b537 PA |
465 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
466 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 467 | |
95954743 | 468 | lwp->head.id = ptid; |
0d62e5e8 | 469 | |
aa5ca48f DE |
470 | if (the_low_target.new_thread != NULL) |
471 | lwp->arch_private = the_low_target.new_thread (); | |
472 | ||
54a0b537 | 473 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 474 | |
54a0b537 | 475 | return lwp; |
0d62e5e8 | 476 | } |
611cb4a5 | 477 | |
da6d8c04 DJ |
478 | /* Start an inferior process and returns its pid. |
479 | ALLARGS is a vector of program-name and args. */ | |
480 | ||
ce3a066d DJ |
481 | static int |
482 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 483 | { |
a6dbe5df | 484 | struct lwp_info *new_lwp; |
da6d8c04 | 485 | int pid; |
95954743 | 486 | ptid_t ptid; |
da6d8c04 | 487 | |
42c81e2a | 488 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
489 | pid = vfork (); |
490 | #else | |
da6d8c04 | 491 | pid = fork (); |
52fb6437 | 492 | #endif |
da6d8c04 DJ |
493 | if (pid < 0) |
494 | perror_with_name ("fork"); | |
495 | ||
496 | if (pid == 0) | |
497 | { | |
498 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
499 | ||
254787d4 | 500 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 501 | |
a9fa9f7d DJ |
502 | setpgid (0, 0); |
503 | ||
2b876972 DJ |
504 | execv (program, allargs); |
505 | if (errno == ENOENT) | |
506 | execvp (program, allargs); | |
da6d8c04 DJ |
507 | |
508 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 509 | strerror (errno)); |
da6d8c04 DJ |
510 | fflush (stderr); |
511 | _exit (0177); | |
512 | } | |
513 | ||
95954743 PA |
514 | linux_add_process (pid, 0); |
515 | ||
516 | ptid = ptid_build (pid, pid, 0); | |
517 | new_lwp = add_lwp (ptid); | |
518 | add_thread (ptid, new_lwp); | |
a6dbe5df | 519 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 520 | |
a9fa9f7d | 521 | return pid; |
da6d8c04 DJ |
522 | } |
523 | ||
524 | /* Attach to an inferior process. */ | |
525 | ||
95954743 PA |
526 | static void |
527 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 528 | { |
95954743 | 529 | ptid_t ptid; |
54a0b537 | 530 | struct lwp_info *new_lwp; |
611cb4a5 | 531 | |
95954743 | 532 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 533 | { |
95954743 | 534 | if (!initial) |
2d717e4f DJ |
535 | { |
536 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 537 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
538 | strerror (errno), errno); |
539 | fflush (stderr); | |
540 | return; | |
541 | } | |
542 | else | |
543 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 544 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 545 | strerror (errno), errno); |
da6d8c04 DJ |
546 | } |
547 | ||
95954743 PA |
548 | if (initial) |
549 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
550 | ptid = ptid_build (lwpid, lwpid, 0); | |
551 | else | |
552 | { | |
553 | /* Note that extracting the pid from the current inferior is | |
554 | safe, since we're always called in the context of the same | |
555 | process as this new thread. */ | |
556 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
557 | ptid = ptid_build (pid, lwpid, 0); | |
558 | } | |
24a09b5f | 559 | |
95954743 PA |
560 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
561 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 562 | |
a6dbe5df PA |
563 | /* We need to wait for SIGSTOP before being able to make the next |
564 | ptrace call on this LWP. */ | |
565 | new_lwp->must_set_ptrace_flags = 1; | |
566 | ||
0d62e5e8 | 567 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
568 | brings it to a halt. |
569 | ||
570 | There are several cases to consider here: | |
571 | ||
572 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 PA |
573 | of a new thread that is being created. |
574 | In this case we should ignore that SIGSTOP and resume the process. | |
575 | This is handled below by setting stop_expected = 1. | |
0e21c1ec DE |
576 | |
577 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
578 | to it via attach_inferior. |
579 | In this case we want the process thread to stop. | |
580 | This is handled by having linux_attach clear stop_expected after | |
581 | we return. | |
582 | ??? If the process already has several threads we leave the other | |
583 | threads running. | |
0e21c1ec DE |
584 | |
585 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
586 | existing threads. |
587 | In this case we want the thread to stop. | |
588 | FIXME: This case is currently not properly handled. | |
589 | We should wait for the SIGSTOP but don't. Things work apparently | |
590 | because enough time passes between when we ptrace (ATTACH) and when | |
591 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
592 | |
593 | On the other hand, if we are currently trying to stop all threads, we | |
594 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 595 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
596 | end of the list, and so the new thread has not yet reached |
597 | wait_for_sigstop (but will). */ | |
0d62e5e8 | 598 | if (! stopping_threads) |
54a0b537 | 599 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
600 | } |
601 | ||
95954743 PA |
602 | void |
603 | linux_attach_lwp (unsigned long lwpid) | |
604 | { | |
605 | linux_attach_lwp_1 (lwpid, 0); | |
606 | } | |
607 | ||
0d62e5e8 | 608 | int |
a1928bad | 609 | linux_attach (unsigned long pid) |
0d62e5e8 | 610 | { |
54a0b537 | 611 | struct lwp_info *lwp; |
0d62e5e8 | 612 | |
95954743 PA |
613 | linux_attach_lwp_1 (pid, 1); |
614 | ||
615 | linux_add_process (pid, 1); | |
0d62e5e8 | 616 | |
bd99dc85 PA |
617 | if (!non_stop) |
618 | { | |
619 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
620 | process. It will be collected by wait shortly. */ | |
95954743 PA |
621 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
622 | ptid_build (pid, pid, 0)); | |
bd99dc85 PA |
623 | lwp->stop_expected = 0; |
624 | } | |
0d62e5e8 | 625 | |
95954743 PA |
626 | return 0; |
627 | } | |
628 | ||
629 | struct counter | |
630 | { | |
631 | int pid; | |
632 | int count; | |
633 | }; | |
634 | ||
635 | static int | |
636 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
637 | { | |
638 | struct counter *counter = args; | |
639 | ||
640 | if (ptid_get_pid (entry->id) == counter->pid) | |
641 | { | |
642 | if (++counter->count > 1) | |
643 | return 1; | |
644 | } | |
d61ddec4 | 645 | |
da6d8c04 DJ |
646 | return 0; |
647 | } | |
648 | ||
95954743 PA |
649 | static int |
650 | last_thread_of_process_p (struct thread_info *thread) | |
651 | { | |
652 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
653 | int pid = ptid_get_pid (ptid); | |
654 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 655 | |
95954743 PA |
656 | return (find_inferior (&all_threads, |
657 | second_thread_of_pid_p, &counter) == NULL); | |
658 | } | |
659 | ||
660 | /* Kill the inferior lwp. */ | |
661 | ||
662 | static int | |
663 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 664 | { |
0d62e5e8 | 665 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 666 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 667 | int wstat; |
95954743 PA |
668 | int pid = * (int *) args; |
669 | ||
670 | if (ptid_get_pid (entry->id) != pid) | |
671 | return 0; | |
0d62e5e8 | 672 | |
fd500816 DJ |
673 | /* We avoid killing the first thread here, because of a Linux kernel (at |
674 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
675 | the children get a chance to be reaped, it will remain a zombie | |
676 | forever. */ | |
95954743 | 677 | |
12b42a12 | 678 | if (lwpid_of (lwp) == pid) |
95954743 PA |
679 | { |
680 | if (debug_threads) | |
681 | fprintf (stderr, "lkop: is last of process %s\n", | |
682 | target_pid_to_str (entry->id)); | |
683 | return 0; | |
684 | } | |
fd500816 | 685 | |
bd99dc85 PA |
686 | /* If we're killing a running inferior, make sure it is stopped |
687 | first, as PTRACE_KILL will not work otherwise. */ | |
688 | if (!lwp->stopped) | |
689 | send_sigstop (&lwp->head); | |
690 | ||
0d62e5e8 DJ |
691 | do |
692 | { | |
bd99dc85 | 693 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
694 | |
695 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 696 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 697 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
698 | |
699 | return 0; | |
da6d8c04 DJ |
700 | } |
701 | ||
95954743 PA |
702 | static int |
703 | linux_kill (int pid) | |
0d62e5e8 | 704 | { |
95954743 | 705 | struct process_info *process; |
54a0b537 | 706 | struct lwp_info *lwp; |
95954743 | 707 | struct thread_info *thread; |
fd500816 | 708 | int wstat; |
95954743 | 709 | int lwpid; |
fd500816 | 710 | |
95954743 PA |
711 | process = find_process_pid (pid); |
712 | if (process == NULL) | |
713 | return -1; | |
9d606399 | 714 | |
95954743 | 715 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 716 | |
54a0b537 | 717 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 718 | thread in the list, so do so now. */ |
95954743 PA |
719 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
720 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
721 | |
722 | if (debug_threads) | |
95954743 PA |
723 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
724 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
725 | |
726 | /* If we're killing a running inferior, make sure it is stopped | |
727 | first, as PTRACE_KILL will not work otherwise. */ | |
728 | if (!lwp->stopped) | |
729 | send_sigstop (&lwp->head); | |
730 | ||
fd500816 DJ |
731 | do |
732 | { | |
bd99dc85 | 733 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
734 | |
735 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
736 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
737 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 738 | |
bd99dc85 | 739 | delete_lwp (lwp); |
fd7dd3e6 | 740 | linux_remove_process (process, 0); |
95954743 | 741 | return 0; |
0d62e5e8 DJ |
742 | } |
743 | ||
95954743 PA |
744 | static int |
745 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
746 | { |
747 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 748 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
749 | int pid = * (int *) args; |
750 | ||
751 | if (ptid_get_pid (entry->id) != pid) | |
752 | return 0; | |
6ad8ae5c | 753 | |
bd99dc85 PA |
754 | /* If we're detaching from a running inferior, make sure it is |
755 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
756 | if (!lwp->stopped) | |
757 | { | |
95954743 | 758 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
759 | |
760 | stopping_threads = 1; | |
761 | send_sigstop (&lwp->head); | |
762 | ||
763 | /* If this detects a new thread through a clone event, the new | |
764 | thread is appended to the end of the lwp list, so we'll | |
765 | eventually detach from it. */ | |
766 | wait_for_sigstop (&lwp->head); | |
767 | stopping_threads = 0; | |
768 | ||
769 | /* If LWP exits while we're trying to stop it, there's nothing | |
770 | left to do. */ | |
95954743 | 771 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 772 | if (lwp == NULL) |
95954743 | 773 | return 0; |
bd99dc85 PA |
774 | } |
775 | ||
ae13219e DJ |
776 | /* Make sure the process isn't stopped at a breakpoint that's |
777 | no longer there. */ | |
54a0b537 | 778 | check_removed_breakpoint (lwp); |
ae13219e DJ |
779 | |
780 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
781 | sure we take care of that now. This isn't absolutely guaranteed | |
782 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 783 | if (lwp->stop_expected) |
ae13219e | 784 | { |
bd99dc85 | 785 | int wstat; |
ae13219e | 786 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
787 | lwp->stop_expected = 0; |
788 | if (lwp->stopped) | |
2acc282a | 789 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 790 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
791 | } |
792 | ||
793 | /* Flush any pending changes to the process's registers. */ | |
794 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 795 | get_lwp_thread (lwp)); |
ae13219e DJ |
796 | |
797 | /* Finally, let it resume. */ | |
bd99dc85 PA |
798 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
799 | ||
800 | delete_lwp (lwp); | |
95954743 | 801 | return 0; |
6ad8ae5c DJ |
802 | } |
803 | ||
dd6953e1 | 804 | static int |
95954743 | 805 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 806 | { |
95954743 PA |
807 | int *pid_p = args; |
808 | ||
809 | if (ptid_get_pid (entry->id) == *pid_p) | |
810 | return 1; | |
811 | ||
812 | return 0; | |
813 | } | |
814 | ||
815 | static int | |
816 | linux_detach (int pid) | |
817 | { | |
818 | struct process_info *process; | |
819 | ||
820 | process = find_process_pid (pid); | |
821 | if (process == NULL) | |
822 | return -1; | |
823 | ||
824 | current_inferior = | |
825 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
826 | ||
ae13219e | 827 | delete_all_breakpoints (); |
95954743 | 828 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
fd7dd3e6 | 829 | linux_remove_process (process, 1); |
dd6953e1 | 830 | return 0; |
6ad8ae5c DJ |
831 | } |
832 | ||
444d6139 | 833 | static void |
95954743 | 834 | linux_join (int pid) |
444d6139 | 835 | { |
444d6139 | 836 | int status, ret; |
95954743 | 837 | struct process_info *process; |
bd99dc85 | 838 | |
95954743 PA |
839 | process = find_process_pid (pid); |
840 | if (process == NULL) | |
841 | return; | |
444d6139 PA |
842 | |
843 | do { | |
95954743 | 844 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
845 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
846 | break; | |
847 | } while (ret != -1 || errno != ECHILD); | |
848 | } | |
849 | ||
6ad8ae5c | 850 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 851 | static int |
95954743 | 852 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 853 | { |
95954743 PA |
854 | struct lwp_info *lwp = find_lwp_pid (ptid); |
855 | ||
856 | /* We assume we always know if a thread exits. If a whole process | |
857 | exited but we still haven't been able to report it to GDB, we'll | |
858 | hold on to the last lwp of the dead process. */ | |
859 | if (lwp != NULL) | |
860 | return !lwp->dead; | |
0d62e5e8 DJ |
861 | else |
862 | return 0; | |
863 | } | |
864 | ||
865 | /* Return nonzero if this process stopped at a breakpoint which | |
866 | no longer appears to be inserted. Also adjust the PC | |
867 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 868 | static int |
54a0b537 | 869 | check_removed_breakpoint (struct lwp_info *event_child) |
da6d8c04 | 870 | { |
0d62e5e8 DJ |
871 | CORE_ADDR stop_pc; |
872 | struct thread_info *saved_inferior; | |
873 | ||
874 | if (event_child->pending_is_breakpoint == 0) | |
875 | return 0; | |
876 | ||
877 | if (debug_threads) | |
54a0b537 | 878 | fprintf (stderr, "Checking for breakpoint in lwp %ld.\n", |
bd99dc85 | 879 | lwpid_of (event_child)); |
0d62e5e8 DJ |
880 | |
881 | saved_inferior = current_inferior; | |
54a0b537 | 882 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 DJ |
883 | |
884 | stop_pc = get_stop_pc (); | |
885 | ||
886 | /* If the PC has changed since we stopped, then we shouldn't do | |
887 | anything. This happens if, for instance, GDB handled the | |
888 | decr_pc_after_break subtraction itself. */ | |
889 | if (stop_pc != event_child->pending_stop_pc) | |
890 | { | |
891 | if (debug_threads) | |
ae13219e DJ |
892 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
893 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
894 | |
895 | event_child->pending_is_breakpoint = 0; | |
896 | current_inferior = saved_inferior; | |
897 | return 0; | |
898 | } | |
899 | ||
900 | /* If the breakpoint is still there, we will report hitting it. */ | |
901 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
902 | { | |
903 | if (debug_threads) | |
904 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
905 | current_inferior = saved_inferior; | |
906 | return 0; | |
907 | } | |
908 | ||
909 | if (debug_threads) | |
910 | fprintf (stderr, "Removed breakpoint.\n"); | |
911 | ||
912 | /* For decr_pc_after_break targets, here is where we perform the | |
913 | decrement. We go immediately from this function to resuming, | |
914 | and can not safely call get_stop_pc () again. */ | |
915 | if (the_low_target.set_pc != NULL) | |
47c0c975 DE |
916 | { |
917 | if (debug_threads) | |
918 | fprintf (stderr, "Set pc to 0x%lx\n", (long) stop_pc); | |
919 | (*the_low_target.set_pc) (stop_pc); | |
920 | } | |
0d62e5e8 DJ |
921 | |
922 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 923 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
924 | event_child->status_pending_p = 0; |
925 | event_child->status_pending = 0; | |
926 | ||
927 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
928 | return 1; |
929 | } | |
930 | ||
54a0b537 PA |
931 | /* Return 1 if this lwp has an interesting status pending. This |
932 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 933 | static int |
95954743 | 934 | status_pending_p (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 935 | { |
54a0b537 | 936 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 PA |
937 | ptid_t ptid = * (ptid_t *) arg; |
938 | ||
939 | /* Check if we're only interested in events from a specific process | |
940 | or its lwps. */ | |
941 | if (!ptid_equal (minus_one_ptid, ptid) | |
942 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
943 | return 0; | |
0d62e5e8 | 944 | |
bd99dc85 | 945 | if (lwp->status_pending_p && !lwp->suspended) |
54a0b537 | 946 | if (check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
947 | { |
948 | /* This thread was stopped at a breakpoint, and the breakpoint | |
949 | is now gone. We were told to continue (or step...) all threads, | |
950 | so GDB isn't trying to single-step past this breakpoint. | |
951 | So instead of reporting the old SIGTRAP, pretend we got to | |
952 | the breakpoint just after it was removed instead of just | |
953 | before; resume the process. */ | |
2acc282a | 954 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
0d62e5e8 DJ |
955 | return 0; |
956 | } | |
957 | ||
bd99dc85 | 958 | return (lwp->status_pending_p && !lwp->suspended); |
0d62e5e8 DJ |
959 | } |
960 | ||
95954743 PA |
961 | static int |
962 | same_lwp (struct inferior_list_entry *entry, void *data) | |
963 | { | |
964 | ptid_t ptid = *(ptid_t *) data; | |
965 | int lwp; | |
966 | ||
967 | if (ptid_get_lwp (ptid) != 0) | |
968 | lwp = ptid_get_lwp (ptid); | |
969 | else | |
970 | lwp = ptid_get_pid (ptid); | |
971 | ||
972 | if (ptid_get_lwp (entry->id) == lwp) | |
973 | return 1; | |
974 | ||
975 | return 0; | |
976 | } | |
977 | ||
978 | struct lwp_info * | |
979 | find_lwp_pid (ptid_t ptid) | |
980 | { | |
981 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
982 | } | |
983 | ||
bd99dc85 | 984 | static struct lwp_info * |
95954743 | 985 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 986 | { |
0d62e5e8 | 987 | int ret; |
95954743 | 988 | int to_wait_for = -1; |
bd99dc85 | 989 | struct lwp_info *child = NULL; |
0d62e5e8 | 990 | |
bd99dc85 | 991 | if (debug_threads) |
95954743 PA |
992 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
993 | ||
994 | if (ptid_equal (ptid, minus_one_ptid)) | |
995 | to_wait_for = -1; /* any child */ | |
996 | else | |
997 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 998 | |
bd99dc85 | 999 | options |= __WALL; |
0d62e5e8 | 1000 | |
bd99dc85 | 1001 | retry: |
0d62e5e8 | 1002 | |
bd99dc85 PA |
1003 | ret = my_waitpid (to_wait_for, wstatp, options); |
1004 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1005 | return NULL; | |
1006 | else if (ret == -1) | |
1007 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1008 | |
1009 | if (debug_threads | |
1010 | && (!WIFSTOPPED (*wstatp) | |
1011 | || (WSTOPSIG (*wstatp) != 32 | |
1012 | && WSTOPSIG (*wstatp) != 33))) | |
1013 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1014 | ||
95954743 | 1015 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1016 | |
24a09b5f DJ |
1017 | /* If we didn't find a process, one of two things presumably happened: |
1018 | - A process we started and then detached from has exited. Ignore it. | |
1019 | - A process we are controlling has forked and the new child's stop | |
1020 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1021 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1022 | { |
1023 | add_pid_to_list (&stopped_pids, ret); | |
1024 | goto retry; | |
1025 | } | |
bd99dc85 | 1026 | else if (child == NULL) |
24a09b5f DJ |
1027 | goto retry; |
1028 | ||
bd99dc85 PA |
1029 | child->stopped = 1; |
1030 | child->pending_is_breakpoint = 0; | |
0d62e5e8 | 1031 | |
bd99dc85 | 1032 | child->last_status = *wstatp; |
32ca6d61 | 1033 | |
d61ddec4 UW |
1034 | /* Architecture-specific setup after inferior is running. |
1035 | This needs to happen after we have attached to the inferior | |
1036 | and it is stopped for the first time, but before we access | |
1037 | any inferior registers. */ | |
1038 | if (new_inferior) | |
1039 | { | |
1040 | the_low_target.arch_setup (); | |
52fa2412 UW |
1041 | #ifdef HAVE_LINUX_REGSETS |
1042 | memset (disabled_regsets, 0, num_regsets); | |
1043 | #endif | |
d61ddec4 UW |
1044 | new_inferior = 0; |
1045 | } | |
1046 | ||
0d62e5e8 | 1047 | if (debug_threads |
47c0c975 DE |
1048 | && WIFSTOPPED (*wstatp) |
1049 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1050 | { |
896c7fbb | 1051 | struct thread_info *saved_inferior = current_inferior; |
47c0c975 DE |
1052 | CORE_ADDR pc; |
1053 | ||
0d62e5e8 | 1054 | current_inferior = (struct thread_info *) |
95954743 | 1055 | find_inferior_id (&all_threads, child->head.id); |
47c0c975 DE |
1056 | pc = (*the_low_target.get_pc) (); |
1057 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); | |
896c7fbb | 1058 | current_inferior = saved_inferior; |
0d62e5e8 | 1059 | } |
bd99dc85 PA |
1060 | |
1061 | return child; | |
0d62e5e8 | 1062 | } |
611cb4a5 | 1063 | |
bd99dc85 PA |
1064 | /* Wait for an event from child PID. If PID is -1, wait for any |
1065 | child. Store the stop status through the status pointer WSTAT. | |
1066 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1067 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1068 | the stopped child otherwise. */ | |
1069 | ||
0d62e5e8 | 1070 | static int |
95954743 | 1071 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 DJ |
1072 | { |
1073 | CORE_ADDR stop_pc; | |
bd99dc85 | 1074 | struct lwp_info *event_child = NULL; |
b65d95c5 | 1075 | int bp_status; |
bd99dc85 | 1076 | struct lwp_info *requested_child = NULL; |
0d62e5e8 | 1077 | |
95954743 | 1078 | /* Check for a lwp with a pending status. */ |
0d62e5e8 DJ |
1079 | /* It is possible that the user changed the pending task's registers since |
1080 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 1081 | (in check_removed_breakpoint); signals should be reported anyway. */ |
bd99dc85 | 1082 | |
95954743 PA |
1083 | if (ptid_equal (ptid, minus_one_ptid) |
1084 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1085 | { |
54a0b537 | 1086 | event_child = (struct lwp_info *) |
95954743 | 1087 | find_inferior (&all_lwps, status_pending_p, &ptid); |
0d62e5e8 | 1088 | if (debug_threads && event_child) |
bd99dc85 | 1089 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1090 | } |
1091 | else | |
1092 | { | |
95954743 | 1093 | requested_child = find_lwp_pid (ptid); |
bd99dc85 PA |
1094 | if (requested_child->status_pending_p |
1095 | && !check_removed_breakpoint (requested_child)) | |
1096 | event_child = requested_child; | |
0d62e5e8 | 1097 | } |
611cb4a5 | 1098 | |
0d62e5e8 DJ |
1099 | if (event_child != NULL) |
1100 | { | |
bd99dc85 PA |
1101 | if (debug_threads) |
1102 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1103 | lwpid_of (event_child), event_child->status_pending); | |
1104 | *wstat = event_child->status_pending; | |
1105 | event_child->status_pending_p = 0; | |
1106 | event_child->status_pending = 0; | |
1107 | current_inferior = get_lwp_thread (event_child); | |
1108 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1109 | } |
1110 | ||
1111 | /* We only enter this loop if no process has a pending wait status. Thus | |
1112 | any action taken in response to a wait status inside this loop is | |
1113 | responding as soon as we detect the status, not after any pending | |
1114 | events. */ | |
1115 | while (1) | |
1116 | { | |
95954743 | 1117 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1118 | |
bd99dc85 PA |
1119 | if ((options & WNOHANG) && event_child == NULL) |
1120 | return 0; | |
0d62e5e8 DJ |
1121 | |
1122 | if (event_child == NULL) | |
1123 | error ("event from unknown child"); | |
611cb4a5 | 1124 | |
bd99dc85 | 1125 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1126 | |
89be2091 | 1127 | /* Check for thread exit. */ |
bd99dc85 | 1128 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1129 | { |
89be2091 | 1130 | if (debug_threads) |
95954743 | 1131 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1132 | |
1133 | /* If the last thread is exiting, just return. */ | |
95954743 | 1134 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1135 | { |
1136 | if (debug_threads) | |
95954743 PA |
1137 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1138 | lwpid_of (event_child)); | |
bd99dc85 PA |
1139 | return lwpid_of (event_child); |
1140 | } | |
89be2091 | 1141 | |
bd99dc85 | 1142 | delete_lwp (event_child); |
89be2091 | 1143 | |
bd99dc85 PA |
1144 | if (!non_stop) |
1145 | { | |
1146 | current_inferior = (struct thread_info *) all_threads.head; | |
1147 | if (debug_threads) | |
1148 | fprintf (stderr, "Current inferior is now %ld\n", | |
1149 | lwpid_of (get_thread_lwp (current_inferior))); | |
1150 | } | |
1151 | else | |
1152 | { | |
1153 | current_inferior = NULL; | |
1154 | if (debug_threads) | |
1155 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1156 | } | |
89be2091 DJ |
1157 | |
1158 | /* If we were waiting for this particular child to do something... | |
1159 | well, it did something. */ | |
bd99dc85 | 1160 | if (requested_child != NULL) |
95954743 | 1161 | return lwpid_of (event_child); |
89be2091 DJ |
1162 | |
1163 | /* Wait for a more interesting event. */ | |
1164 | continue; | |
1165 | } | |
1166 | ||
a6dbe5df PA |
1167 | if (event_child->must_set_ptrace_flags) |
1168 | { | |
1169 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
1170 | 0, PTRACE_O_TRACECLONE); | |
1171 | event_child->must_set_ptrace_flags = 0; | |
1172 | } | |
1173 | ||
bd99dc85 PA |
1174 | if (WIFSTOPPED (*wstat) |
1175 | && WSTOPSIG (*wstat) == SIGSTOP | |
89be2091 DJ |
1176 | && event_child->stop_expected) |
1177 | { | |
1178 | if (debug_threads) | |
1179 | fprintf (stderr, "Expected stop.\n"); | |
1180 | event_child->stop_expected = 0; | |
2acc282a | 1181 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
89be2091 DJ |
1182 | continue; |
1183 | } | |
1184 | ||
bd99dc85 PA |
1185 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1186 | && *wstat >> 16 != 0) | |
24a09b5f | 1187 | { |
bd99dc85 | 1188 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1189 | continue; |
1190 | } | |
1191 | ||
89be2091 DJ |
1192 | /* If GDB is not interested in this signal, don't stop other |
1193 | threads, and don't report it to GDB. Just resume the | |
1194 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1195 | signals as well as any that GDB specifically requested we |
1196 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1197 | and do not ignore signals when stepping - they may require | |
1198 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1199 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1200 | thread library? */ | |
bd99dc85 | 1201 | if (WIFSTOPPED (*wstat) |
69f223ed | 1202 | && !event_child->stepping |
24a09b5f DJ |
1203 | && ( |
1204 | #ifdef USE_THREAD_DB | |
cdbfd419 | 1205 | (current_process ()->private->thread_db != NULL |
bd99dc85 PA |
1206 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1207 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1208 | || |
1209 | #endif | |
bd99dc85 PA |
1210 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
1211 | && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
1212 | { |
1213 | siginfo_t info, *info_p; | |
1214 | ||
1215 | if (debug_threads) | |
24a09b5f | 1216 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1217 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1218 | |
bd99dc85 | 1219 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1220 | info_p = &info; |
1221 | else | |
1222 | info_p = NULL; | |
2acc282a | 1223 | linux_resume_one_lwp (event_child, |
54a0b537 | 1224 | event_child->stepping, |
bd99dc85 | 1225 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1226 | continue; |
0d62e5e8 | 1227 | } |
611cb4a5 | 1228 | |
0d62e5e8 DJ |
1229 | /* If this event was not handled above, and is not a SIGTRAP, report |
1230 | it. */ | |
bd99dc85 PA |
1231 | if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP) |
1232 | return lwpid_of (event_child); | |
611cb4a5 | 1233 | |
0d62e5e8 DJ |
1234 | /* If this target does not support breakpoints, we simply report the |
1235 | SIGTRAP; it's of no concern to us. */ | |
1236 | if (the_low_target.get_pc == NULL) | |
bd99dc85 | 1237 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1238 | |
1239 | stop_pc = get_stop_pc (); | |
1240 | ||
1241 | /* bp_reinsert will only be set if we were single-stepping. | |
1242 | Notice that we will resume the process after hitting | |
1243 | a gdbserver breakpoint; single-stepping to/over one | |
1244 | is not supported (yet). */ | |
1245 | if (event_child->bp_reinsert != 0) | |
1246 | { | |
1247 | if (debug_threads) | |
1248 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
1249 | reinsert_breakpoint (event_child->bp_reinsert); | |
1250 | event_child->bp_reinsert = 0; | |
1251 | ||
1252 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
2acc282a | 1253 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
0d62e5e8 DJ |
1254 | continue; |
1255 | } | |
1256 | ||
b65d95c5 | 1257 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 1258 | |
b65d95c5 | 1259 | if (bp_status != 0) |
0d62e5e8 | 1260 | { |
b65d95c5 DJ |
1261 | if (debug_threads) |
1262 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1263 | ||
0d62e5e8 | 1264 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 1265 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
1266 | adjustment for us at the appropriate time. */ |
1267 | event_child->pending_is_breakpoint = 1; | |
1268 | event_child->pending_stop_pc = stop_pc; | |
1269 | ||
b65d95c5 | 1270 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
1271 | loop instead of simply replacing the breakpoint right away, |
1272 | in order to not lose signals sent to the thread that hit the | |
1273 | breakpoint. Unfortunately this increases the window where another | |
1274 | thread could sneak past the removed breakpoint. For the current | |
1275 | use of server-side breakpoints (thread creation) this is | |
1276 | acceptable; but it needs to be considered before this breakpoint | |
1277 | mechanism can be used in more general ways. For some breakpoints | |
1278 | it may be necessary to stop all other threads, but that should | |
1279 | be avoided where possible. | |
1280 | ||
1281 | If breakpoint_reinsert_addr is NULL, that means that we can | |
1282 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
1283 | mark it for reinsertion, and single-step. | |
1284 | ||
1285 | Otherwise, call the target function to figure out where we need | |
1286 | our temporary breakpoint, create it, and continue executing this | |
1287 | process. */ | |
bd99dc85 PA |
1288 | |
1289 | /* NOTE: we're lifting breakpoints in non-stop mode. This | |
1290 | is currently only used for thread event breakpoints, so | |
1291 | it isn't that bad as long as we have PTRACE_EVENT_CLONE | |
1292 | events. */ | |
b65d95c5 DJ |
1293 | if (bp_status == 2) |
1294 | /* No need to reinsert. */ | |
2acc282a | 1295 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
b65d95c5 | 1296 | else if (the_low_target.breakpoint_reinsert_addr == NULL) |
0d62e5e8 DJ |
1297 | { |
1298 | event_child->bp_reinsert = stop_pc; | |
1299 | uninsert_breakpoint (stop_pc); | |
2acc282a | 1300 | linux_resume_one_lwp (event_child, 1, 0, NULL); |
0d62e5e8 DJ |
1301 | } |
1302 | else | |
1303 | { | |
1304 | reinsert_breakpoint_by_bp | |
1305 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
2acc282a | 1306 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
611cb4a5 | 1307 | } |
0d62e5e8 DJ |
1308 | |
1309 | continue; | |
1310 | } | |
1311 | ||
b65d95c5 DJ |
1312 | if (debug_threads) |
1313 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
1314 | ||
0d62e5e8 | 1315 | /* If we were single-stepping, we definitely want to report the |
c35fafde PA |
1316 | SIGTRAP. Although the single-step operation has completed, |
1317 | do not clear clear the stepping flag yet; we need to check it | |
1318 | in wait_for_sigstop. */ | |
0d62e5e8 | 1319 | if (event_child->stepping) |
bd99dc85 | 1320 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1321 | |
1322 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
1323 | Check if it is a breakpoint, and if so mark the process information | |
1324 | accordingly. This will handle both the necessary fiddling with the | |
1325 | PC on decr_pc_after_break targets and suppressing extra threads | |
1326 | hitting a breakpoint if two hit it at once and then GDB removes it | |
1327 | after the first is reported. Arguably it would be better to report | |
1328 | multiple threads hitting breakpoints simultaneously, but the current | |
1329 | remote protocol does not allow this. */ | |
1330 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
1331 | { | |
1332 | event_child->pending_is_breakpoint = 1; | |
1333 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
1334 | } |
1335 | ||
bd99dc85 | 1336 | return lwpid_of (event_child); |
611cb4a5 | 1337 | } |
0d62e5e8 | 1338 | |
611cb4a5 DJ |
1339 | /* NOTREACHED */ |
1340 | return 0; | |
1341 | } | |
1342 | ||
95954743 PA |
1343 | static int |
1344 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1345 | { | |
1346 | ptid_t wait_ptid; | |
1347 | ||
1348 | if (ptid_is_pid (ptid)) | |
1349 | { | |
1350 | /* A request to wait for a specific tgid. This is not possible | |
1351 | with waitpid, so instead, we wait for any child, and leave | |
1352 | children we're not interested in right now with a pending | |
1353 | status to report later. */ | |
1354 | wait_ptid = minus_one_ptid; | |
1355 | } | |
1356 | else | |
1357 | wait_ptid = ptid; | |
1358 | ||
1359 | while (1) | |
1360 | { | |
1361 | int event_pid; | |
1362 | ||
1363 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1364 | ||
1365 | if (event_pid > 0 | |
1366 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1367 | { | |
1368 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1369 | ||
1370 | if (! WIFSTOPPED (*wstat)) | |
1371 | mark_lwp_dead (event_child, *wstat); | |
1372 | else | |
1373 | { | |
1374 | event_child->status_pending_p = 1; | |
1375 | event_child->status_pending = *wstat; | |
1376 | } | |
1377 | } | |
1378 | else | |
1379 | return event_pid; | |
1380 | } | |
1381 | } | |
1382 | ||
0d62e5e8 | 1383 | /* Wait for process, returns status. */ |
da6d8c04 | 1384 | |
95954743 PA |
1385 | static ptid_t |
1386 | linux_wait_1 (ptid_t ptid, | |
1387 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1388 | { |
e5f1222d | 1389 | int w; |
bd99dc85 PA |
1390 | struct thread_info *thread = NULL; |
1391 | struct lwp_info *lwp = NULL; | |
1392 | int options; | |
bd99dc85 PA |
1393 | int pid; |
1394 | ||
1395 | /* Translate generic target options into linux options. */ | |
1396 | options = __WALL; | |
1397 | if (target_options & TARGET_WNOHANG) | |
1398 | options |= WNOHANG; | |
0d62e5e8 DJ |
1399 | |
1400 | retry: | |
bd99dc85 PA |
1401 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1402 | ||
0d62e5e8 DJ |
1403 | /* If we were only supposed to resume one thread, only wait for |
1404 | that thread - if it's still alive. If it died, however - which | |
1405 | can happen if we're coming from the thread death case below - | |
1406 | then we need to make sure we restart the other threads. We could | |
1407 | pick a thread at random or restart all; restarting all is less | |
1408 | arbitrary. */ | |
95954743 PA |
1409 | if (!non_stop |
1410 | && !ptid_equal (cont_thread, null_ptid) | |
1411 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1412 | { |
bd99dc85 PA |
1413 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1414 | cont_thread); | |
0d62e5e8 DJ |
1415 | |
1416 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1417 | if (thread == NULL) |
64386c31 DJ |
1418 | { |
1419 | struct thread_resume resume_info; | |
95954743 | 1420 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1421 | resume_info.kind = resume_continue; |
1422 | resume_info.sig = 0; | |
2bd7c093 | 1423 | linux_resume (&resume_info, 1); |
64386c31 | 1424 | } |
bd99dc85 | 1425 | else |
95954743 | 1426 | ptid = cont_thread; |
0d62e5e8 | 1427 | } |
da6d8c04 | 1428 | |
95954743 | 1429 | pid = linux_wait_for_event (ptid, &w, options); |
bd99dc85 | 1430 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1431 | return null_ptid; |
bd99dc85 PA |
1432 | |
1433 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1434 | |
0d62e5e8 DJ |
1435 | /* If we are waiting for a particular child, and it exited, |
1436 | linux_wait_for_event will return its exit status. Similarly if | |
1437 | the last child exited. If this is not the last child, however, | |
1438 | do not report it as exited until there is a 'thread exited' response | |
1439 | available in the remote protocol. Instead, just wait for another event. | |
1440 | This should be safe, because if the thread crashed we will already | |
1441 | have reported the termination signal to GDB; that should stop any | |
1442 | in-progress stepping operations, etc. | |
1443 | ||
1444 | Report the exit status of the last thread to exit. This matches | |
1445 | LinuxThreads' behavior. */ | |
1446 | ||
95954743 | 1447 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1448 | { |
bd99dc85 | 1449 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1450 | { |
95954743 PA |
1451 | int pid = pid_of (lwp); |
1452 | struct process_info *process = find_process_pid (pid); | |
5b1c542e | 1453 | |
bd99dc85 | 1454 | delete_lwp (lwp); |
fd7dd3e6 | 1455 | linux_remove_process (process, 0); |
5b1c542e | 1456 | |
bd99dc85 | 1457 | current_inferior = NULL; |
5b1c542e | 1458 | |
bd99dc85 PA |
1459 | if (WIFEXITED (w)) |
1460 | { | |
1461 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1462 | ourstatus->value.integer = WEXITSTATUS (w); | |
1463 | ||
1464 | if (debug_threads) | |
1465 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1466 | } | |
1467 | else | |
1468 | { | |
1469 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1470 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1471 | ||
1472 | if (debug_threads) | |
1473 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1474 | ||
1475 | } | |
5b1c542e | 1476 | |
95954743 | 1477 | return pid_to_ptid (pid); |
0d62e5e8 | 1478 | } |
da6d8c04 | 1479 | } |
0d62e5e8 | 1480 | else |
da6d8c04 | 1481 | { |
0d62e5e8 DJ |
1482 | if (!WIFSTOPPED (w)) |
1483 | goto retry; | |
da6d8c04 DJ |
1484 | } |
1485 | ||
bd99dc85 PA |
1486 | /* In all-stop, stop all threads. Be careful to only do this if |
1487 | we're about to report an event to GDB. */ | |
1488 | if (!non_stop) | |
1489 | stop_all_lwps (); | |
1490 | ||
5b1c542e | 1491 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1492 | |
bd99dc85 PA |
1493 | if (lwp->suspended && WSTOPSIG (w) == SIGSTOP) |
1494 | { | |
1495 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1496 | and it stopped cleanly, so report as SIG0. The use of | |
1497 | SIGSTOP is an implementation detail. */ | |
1498 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1499 | } | |
1500 | else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP) | |
1501 | { | |
1502 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1503 | but, it stopped for other reasons. Set stop_expected so the | |
1504 | pending SIGSTOP is ignored and the LWP is resumed. */ | |
1505 | lwp->stop_expected = 1; | |
1506 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1507 | } | |
1508 | else | |
1509 | { | |
1510 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1511 | } | |
1512 | ||
1513 | if (debug_threads) | |
95954743 PA |
1514 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
1515 | target_pid_to_str (lwp->head.id), | |
bd99dc85 PA |
1516 | ourstatus->kind, |
1517 | ourstatus->value.sig); | |
1518 | ||
95954743 | 1519 | return lwp->head.id; |
bd99dc85 PA |
1520 | } |
1521 | ||
1522 | /* Get rid of any pending event in the pipe. */ | |
1523 | static void | |
1524 | async_file_flush (void) | |
1525 | { | |
1526 | int ret; | |
1527 | char buf; | |
1528 | ||
1529 | do | |
1530 | ret = read (linux_event_pipe[0], &buf, 1); | |
1531 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1532 | } | |
1533 | ||
1534 | /* Put something in the pipe, so the event loop wakes up. */ | |
1535 | static void | |
1536 | async_file_mark (void) | |
1537 | { | |
1538 | int ret; | |
1539 | ||
1540 | async_file_flush (); | |
1541 | ||
1542 | do | |
1543 | ret = write (linux_event_pipe[1], "+", 1); | |
1544 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1545 | ||
1546 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1547 | be awakened anyway. */ | |
1548 | } | |
1549 | ||
95954743 PA |
1550 | static ptid_t |
1551 | linux_wait (ptid_t ptid, | |
1552 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1553 | { |
95954743 | 1554 | ptid_t event_ptid; |
bd99dc85 PA |
1555 | |
1556 | if (debug_threads) | |
95954743 | 1557 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1558 | |
1559 | /* Flush the async file first. */ | |
1560 | if (target_is_async_p ()) | |
1561 | async_file_flush (); | |
1562 | ||
95954743 | 1563 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1564 | |
1565 | /* If at least one stop was reported, there may be more. A single | |
1566 | SIGCHLD can signal more than one child stop. */ | |
1567 | if (target_is_async_p () | |
1568 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1569 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1570 | async_file_mark (); |
1571 | ||
1572 | return event_ptid; | |
da6d8c04 DJ |
1573 | } |
1574 | ||
c5f62d5f | 1575 | /* Send a signal to an LWP. */ |
fd500816 DJ |
1576 | |
1577 | static int | |
a1928bad | 1578 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 1579 | { |
c5f62d5f DE |
1580 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1581 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 1582 | |
c5f62d5f DE |
1583 | #ifdef __NR_tkill |
1584 | { | |
1585 | static int tkill_failed; | |
fd500816 | 1586 | |
c5f62d5f DE |
1587 | if (!tkill_failed) |
1588 | { | |
1589 | int ret; | |
1590 | ||
1591 | errno = 0; | |
1592 | ret = syscall (__NR_tkill, lwpid, signo); | |
1593 | if (errno != ENOSYS) | |
1594 | return ret; | |
1595 | tkill_failed = 1; | |
1596 | } | |
1597 | } | |
fd500816 DJ |
1598 | #endif |
1599 | ||
1600 | return kill (lwpid, signo); | |
1601 | } | |
1602 | ||
0d62e5e8 DJ |
1603 | static void |
1604 | send_sigstop (struct inferior_list_entry *entry) | |
1605 | { | |
54a0b537 | 1606 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1607 | int pid; |
0d62e5e8 | 1608 | |
54a0b537 | 1609 | if (lwp->stopped) |
0d62e5e8 DJ |
1610 | return; |
1611 | ||
bd99dc85 PA |
1612 | pid = lwpid_of (lwp); |
1613 | ||
0d62e5e8 DJ |
1614 | /* If we already have a pending stop signal for this process, don't |
1615 | send another. */ | |
54a0b537 | 1616 | if (lwp->stop_expected) |
0d62e5e8 | 1617 | { |
ae13219e | 1618 | if (debug_threads) |
bd99dc85 | 1619 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e DJ |
1620 | |
1621 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1622 | will receive the SIGSTOP event (instead of silently resuming and | |
1623 | waiting again). It'll be reset below. */ | |
54a0b537 | 1624 | lwp->stop_expected = 0; |
0d62e5e8 DJ |
1625 | return; |
1626 | } | |
1627 | ||
1628 | if (debug_threads) | |
bd99dc85 | 1629 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1630 | |
bd99dc85 | 1631 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1632 | } |
1633 | ||
95954743 PA |
1634 | static void |
1635 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
1636 | { | |
1637 | /* It's dead, really. */ | |
1638 | lwp->dead = 1; | |
1639 | ||
1640 | /* Store the exit status for later. */ | |
1641 | lwp->status_pending_p = 1; | |
1642 | lwp->status_pending = wstat; | |
1643 | ||
1644 | /* So that check_removed_breakpoint doesn't try to figure out if | |
1645 | this is stopped at a breakpoint. */ | |
1646 | lwp->pending_is_breakpoint = 0; | |
1647 | ||
1648 | /* Prevent trying to stop it. */ | |
1649 | lwp->stopped = 1; | |
1650 | ||
1651 | /* No further stops are expected from a dead lwp. */ | |
1652 | lwp->stop_expected = 0; | |
1653 | } | |
1654 | ||
0d62e5e8 DJ |
1655 | static void |
1656 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1657 | { | |
54a0b537 | 1658 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1659 | struct thread_info *saved_inferior; |
a1928bad | 1660 | int wstat; |
95954743 PA |
1661 | ptid_t saved_tid; |
1662 | ptid_t ptid; | |
0d62e5e8 | 1663 | |
54a0b537 | 1664 | if (lwp->stopped) |
0d62e5e8 DJ |
1665 | return; |
1666 | ||
1667 | saved_inferior = current_inferior; | |
bd99dc85 PA |
1668 | if (saved_inferior != NULL) |
1669 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1670 | else | |
95954743 | 1671 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 1672 | |
95954743 | 1673 | ptid = lwp->head.id; |
bd99dc85 PA |
1674 | |
1675 | linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
1676 | |
1677 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1678 | and record the pending SIGSTOP. If the process exited, just | |
1679 | return. */ | |
1680 | if (WIFSTOPPED (wstat) | |
1681 | && WSTOPSIG (wstat) != SIGSTOP) | |
1682 | { | |
1683 | if (debug_threads) | |
24a09b5f | 1684 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
bd99dc85 | 1685 | lwpid_of (lwp), wstat); |
c35fafde PA |
1686 | |
1687 | /* Do not leave a pending single-step finish to be reported to | |
1688 | the client. The client will give us a new action for this | |
1689 | thread, possibly a continue request --- otherwise, the client | |
1690 | would consider this pending SIGTRAP reported later a spurious | |
1691 | signal. */ | |
1692 | if (WSTOPSIG (wstat) == SIGTRAP | |
1693 | && lwp->stepping | |
1694 | && !linux_stopped_by_watchpoint ()) | |
1695 | { | |
1696 | if (debug_threads) | |
1697 | fprintf (stderr, " single-step SIGTRAP ignored\n"); | |
1698 | } | |
1699 | else | |
1700 | { | |
1701 | lwp->status_pending_p = 1; | |
1702 | lwp->status_pending = wstat; | |
1703 | } | |
54a0b537 | 1704 | lwp->stop_expected = 1; |
0d62e5e8 | 1705 | } |
95954743 PA |
1706 | else if (!WIFSTOPPED (wstat)) |
1707 | { | |
1708 | if (debug_threads) | |
1709 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
1710 | lwpid_of (lwp)); | |
1711 | ||
1712 | /* Leave this status pending for the next time we're able to | |
1713 | report it. In the mean time, we'll report this lwp as dead | |
1714 | to GDB, so GDB doesn't try to read registers and memory from | |
1715 | it. */ | |
1716 | mark_lwp_dead (lwp, wstat); | |
1717 | } | |
0d62e5e8 | 1718 | |
bd99dc85 | 1719 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
1720 | current_inferior = saved_inferior; |
1721 | else | |
1722 | { | |
1723 | if (debug_threads) | |
1724 | fprintf (stderr, "Previously current thread died.\n"); | |
1725 | ||
bd99dc85 PA |
1726 | if (non_stop) |
1727 | { | |
1728 | /* We can't change the current inferior behind GDB's back, | |
1729 | otherwise, a subsequent command may apply to the wrong | |
1730 | process. */ | |
1731 | current_inferior = NULL; | |
1732 | } | |
1733 | else | |
1734 | { | |
1735 | /* Set a valid thread as current. */ | |
1736 | set_desired_inferior (0); | |
1737 | } | |
0d62e5e8 DJ |
1738 | } |
1739 | } | |
1740 | ||
1741 | static void | |
54a0b537 | 1742 | stop_all_lwps (void) |
0d62e5e8 DJ |
1743 | { |
1744 | stopping_threads = 1; | |
54a0b537 PA |
1745 | for_each_inferior (&all_lwps, send_sigstop); |
1746 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
1747 | stopping_threads = 0; |
1748 | } | |
1749 | ||
da6d8c04 DJ |
1750 | /* Resume execution of the inferior process. |
1751 | If STEP is nonzero, single-step it. | |
1752 | If SIGNAL is nonzero, give it that signal. */ | |
1753 | ||
ce3a066d | 1754 | static void |
2acc282a | 1755 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 1756 | int step, int signal, siginfo_t *info) |
da6d8c04 | 1757 | { |
0d62e5e8 DJ |
1758 | struct thread_info *saved_inferior; |
1759 | ||
54a0b537 | 1760 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
1761 | return; |
1762 | ||
1763 | /* If we have pending signals or status, and a new signal, enqueue the | |
1764 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1765 | breakpoint; it will be picked up again below. */ | |
1766 | if (signal != 0 | |
54a0b537 PA |
1767 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
1768 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
1769 | { |
1770 | struct pending_signals *p_sig; | |
bca929d3 | 1771 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 1772 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 1773 | p_sig->signal = signal; |
32ca6d61 DJ |
1774 | if (info == NULL) |
1775 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1776 | else | |
1777 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 1778 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
1779 | } |
1780 | ||
54a0b537 | 1781 | if (lwp->status_pending_p && !check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
1782 | return; |
1783 | ||
1784 | saved_inferior = current_inferior; | |
54a0b537 | 1785 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
1786 | |
1787 | if (debug_threads) | |
1b3f6016 | 1788 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 1789 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 1790 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
1791 | |
1792 | /* This bit needs some thinking about. If we get a signal that | |
1793 | we must report while a single-step reinsert is still pending, | |
1794 | we often end up resuming the thread. It might be better to | |
1795 | (ew) allow a stack of pending events; then we could be sure that | |
1796 | the reinsert happened right away and not lose any signals. | |
1797 | ||
1798 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 1799 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
1800 | complete correctness, so it won't solve that problem. It may be |
1801 | worthwhile just to solve this one, however. */ | |
54a0b537 | 1802 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
1803 | { |
1804 | if (debug_threads) | |
54a0b537 | 1805 | fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert); |
0d62e5e8 DJ |
1806 | if (step == 0) |
1807 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1808 | step = 1; | |
1809 | ||
1810 | /* Postpone any pending signal. It was enqueued above. */ | |
1811 | signal = 0; | |
1812 | } | |
1813 | ||
54a0b537 | 1814 | check_removed_breakpoint (lwp); |
0d62e5e8 | 1815 | |
aa691b87 | 1816 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 1817 | { |
47c0c975 DE |
1818 | CORE_ADDR pc = (*the_low_target.get_pc) (); |
1819 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); | |
0d62e5e8 DJ |
1820 | } |
1821 | ||
1822 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1823 | a breakpoint. */ | |
54a0b537 | 1824 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
1825 | { |
1826 | struct pending_signals **p_sig; | |
1827 | ||
54a0b537 | 1828 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
1829 | while ((*p_sig)->prev != NULL) |
1830 | p_sig = &(*p_sig)->prev; | |
1831 | ||
1832 | signal = (*p_sig)->signal; | |
32ca6d61 | 1833 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 1834 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 1835 | |
0d62e5e8 DJ |
1836 | free (*p_sig); |
1837 | *p_sig = NULL; | |
1838 | } | |
1839 | ||
aa5ca48f DE |
1840 | if (the_low_target.prepare_to_resume != NULL) |
1841 | the_low_target.prepare_to_resume (lwp); | |
1842 | ||
0d62e5e8 | 1843 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 1844 | get_lwp_thread (lwp)); |
da6d8c04 | 1845 | errno = 0; |
54a0b537 PA |
1846 | lwp->stopped = 0; |
1847 | lwp->stepping = step; | |
bd99dc85 | 1848 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal); |
0d62e5e8 DJ |
1849 | |
1850 | current_inferior = saved_inferior; | |
da6d8c04 | 1851 | if (errno) |
3221518c UW |
1852 | { |
1853 | /* ESRCH from ptrace either means that the thread was already | |
1854 | running (an error) or that it is gone (a race condition). If | |
1855 | it's gone, we will get a notification the next time we wait, | |
1856 | so we can ignore the error. We could differentiate these | |
1857 | two, but it's tricky without waiting; the thread still exists | |
1858 | as a zombie, so sending it signal 0 would succeed. So just | |
1859 | ignore ESRCH. */ | |
1860 | if (errno == ESRCH) | |
1861 | return; | |
1862 | ||
1863 | perror_with_name ("ptrace"); | |
1864 | } | |
da6d8c04 DJ |
1865 | } |
1866 | ||
2bd7c093 PA |
1867 | struct thread_resume_array |
1868 | { | |
1869 | struct thread_resume *resume; | |
1870 | size_t n; | |
1871 | }; | |
64386c31 DJ |
1872 | |
1873 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1874 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1875 | resume request. | |
1876 | ||
1877 | This algorithm is O(threads * resume elements), but resume elements | |
1878 | is small (and will remain small at least until GDB supports thread | |
1879 | suspension). */ | |
2bd7c093 PA |
1880 | static int |
1881 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 1882 | { |
54a0b537 | 1883 | struct lwp_info *lwp; |
64386c31 | 1884 | struct thread_info *thread; |
5544ad89 | 1885 | int ndx; |
2bd7c093 | 1886 | struct thread_resume_array *r; |
64386c31 DJ |
1887 | |
1888 | thread = (struct thread_info *) entry; | |
54a0b537 | 1889 | lwp = get_thread_lwp (thread); |
2bd7c093 | 1890 | r = arg; |
64386c31 | 1891 | |
2bd7c093 | 1892 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
1893 | { |
1894 | ptid_t ptid = r->resume[ndx].thread; | |
1895 | if (ptid_equal (ptid, minus_one_ptid) | |
1896 | || ptid_equal (ptid, entry->id) | |
1897 | || (ptid_is_pid (ptid) | |
1898 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
1899 | || (ptid_get_lwp (ptid) == -1 | |
1900 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
1901 | { | |
1902 | lwp->resume = &r->resume[ndx]; | |
1903 | return 0; | |
1904 | } | |
1905 | } | |
2bd7c093 PA |
1906 | |
1907 | /* No resume action for this thread. */ | |
1908 | lwp->resume = NULL; | |
64386c31 | 1909 | |
2bd7c093 | 1910 | return 0; |
5544ad89 DJ |
1911 | } |
1912 | ||
5544ad89 | 1913 | |
bd99dc85 PA |
1914 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
1915 | static int | |
1916 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 1917 | { |
bd99dc85 | 1918 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 1919 | |
bd99dc85 PA |
1920 | /* LWPs which will not be resumed are not interesting, because |
1921 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 1922 | if (lwp->resume == NULL) |
bd99dc85 | 1923 | return 0; |
64386c31 | 1924 | |
bd99dc85 PA |
1925 | /* If this thread has a removed breakpoint, we won't have any |
1926 | events to report later, so check now. check_removed_breakpoint | |
1927 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1928 | for any thread that we are not otherwise going to resume - this | |
1929 | lets us preserve stopped status when two threads hit a breakpoint. | |
1930 | GDB removes the breakpoint to single-step a particular thread | |
1931 | past it, then re-inserts it and resumes all threads. We want | |
1932 | to report the second thread without resuming it in the interim. */ | |
1933 | if (lwp->status_pending_p) | |
1934 | check_removed_breakpoint (lwp); | |
5544ad89 | 1935 | |
bd99dc85 PA |
1936 | if (lwp->status_pending_p) |
1937 | * (int *) flag_p = 1; | |
c6ecbae5 | 1938 | |
bd99dc85 | 1939 | return 0; |
5544ad89 DJ |
1940 | } |
1941 | ||
1942 | /* This function is called once per thread. We check the thread's resume | |
1943 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 1944 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 1945 | |
bd99dc85 PA |
1946 | For threads which we aren't explicitly told otherwise, we preserve |
1947 | the stepping flag; this is used for stepping over gdbserver-placed | |
1948 | breakpoints. | |
1949 | ||
1950 | If pending_flags was set in any thread, we queue any needed | |
1951 | signals, since we won't actually resume. We already have a pending | |
1952 | event to report, so we don't need to preserve any step requests; | |
1953 | they should be re-issued if necessary. */ | |
1954 | ||
1955 | static int | |
1956 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 1957 | { |
54a0b537 | 1958 | struct lwp_info *lwp; |
5544ad89 | 1959 | struct thread_info *thread; |
bd99dc85 PA |
1960 | int step; |
1961 | int pending_flag = * (int *) arg; | |
5544ad89 DJ |
1962 | |
1963 | thread = (struct thread_info *) entry; | |
54a0b537 | 1964 | lwp = get_thread_lwp (thread); |
5544ad89 | 1965 | |
2bd7c093 | 1966 | if (lwp->resume == NULL) |
bd99dc85 | 1967 | return 0; |
5544ad89 | 1968 | |
bd99dc85 | 1969 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 1970 | { |
bd99dc85 PA |
1971 | if (debug_threads) |
1972 | fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp)); | |
1973 | ||
1974 | if (!lwp->stopped) | |
1975 | { | |
1976 | if (debug_threads) | |
95954743 | 1977 | fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
1978 | |
1979 | lwp->suspended = 1; | |
1980 | send_sigstop (&lwp->head); | |
1981 | } | |
1982 | else | |
1983 | { | |
1984 | if (debug_threads) | |
1985 | { | |
1986 | if (lwp->suspended) | |
1987 | fprintf (stderr, "already stopped/suspended LWP %ld\n", | |
1988 | lwpid_of (lwp)); | |
1989 | else | |
1990 | fprintf (stderr, "already stopped/not suspended LWP %ld\n", | |
1991 | lwpid_of (lwp)); | |
1992 | } | |
32ca6d61 | 1993 | |
bd99dc85 PA |
1994 | /* Make sure we leave the LWP suspended, so we don't try to |
1995 | resume it without GDB telling us to. FIXME: The LWP may | |
1996 | have been stopped in an internal event that was not meant | |
1997 | to be notified back to GDB (e.g., gdbserver breakpoint), | |
1998 | so we should be reporting a stop event in that case | |
1999 | too. */ | |
2000 | lwp->suspended = 1; | |
2001 | } | |
32ca6d61 | 2002 | |
bd99dc85 PA |
2003 | /* For stop requests, we're done. */ |
2004 | lwp->resume = NULL; | |
2005 | return 0; | |
5544ad89 | 2006 | } |
bd99dc85 PA |
2007 | else |
2008 | lwp->suspended = 0; | |
5544ad89 | 2009 | |
bd99dc85 PA |
2010 | /* If this thread which is about to be resumed has a pending status, |
2011 | then don't resume any threads - we can just report the pending | |
2012 | status. Make sure to queue any signals that would otherwise be | |
2013 | sent. In all-stop mode, we do this decision based on if *any* | |
2014 | thread has a pending status. */ | |
2015 | if (non_stop) | |
2016 | resume_status_pending_p (&lwp->head, &pending_flag); | |
5544ad89 | 2017 | |
bd99dc85 PA |
2018 | if (!pending_flag) |
2019 | { | |
2020 | if (debug_threads) | |
2021 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 2022 | |
95954743 | 2023 | if (ptid_equal (lwp->resume->thread, minus_one_ptid) |
bd99dc85 PA |
2024 | && lwp->stepping |
2025 | && lwp->pending_is_breakpoint) | |
2026 | step = 1; | |
2027 | else | |
2028 | step = (lwp->resume->kind == resume_step); | |
5544ad89 | 2029 | |
2acc282a | 2030 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
2031 | } |
2032 | else | |
2033 | { | |
2034 | if (debug_threads) | |
2035 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 2036 | |
bd99dc85 PA |
2037 | /* If we have a new signal, enqueue the signal. */ |
2038 | if (lwp->resume->sig != 0) | |
2039 | { | |
2040 | struct pending_signals *p_sig; | |
2041 | p_sig = xmalloc (sizeof (*p_sig)); | |
2042 | p_sig->prev = lwp->pending_signals; | |
2043 | p_sig->signal = lwp->resume->sig; | |
2044 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2045 | ||
2046 | /* If this is the same signal we were previously stopped by, | |
2047 | make sure to queue its siginfo. We can ignore the return | |
2048 | value of ptrace; if it fails, we'll skip | |
2049 | PTRACE_SETSIGINFO. */ | |
2050 | if (WIFSTOPPED (lwp->last_status) | |
2051 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
2052 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
2053 | ||
2054 | lwp->pending_signals = p_sig; | |
2055 | } | |
2056 | } | |
5544ad89 | 2057 | |
bd99dc85 | 2058 | lwp->resume = NULL; |
5544ad89 | 2059 | return 0; |
0d62e5e8 DJ |
2060 | } |
2061 | ||
2062 | static void | |
2bd7c093 | 2063 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 2064 | { |
5544ad89 | 2065 | int pending_flag; |
2bd7c093 | 2066 | struct thread_resume_array array = { resume_info, n }; |
c6ecbae5 | 2067 | |
2bd7c093 | 2068 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 DJ |
2069 | |
2070 | /* If there is a thread which would otherwise be resumed, which | |
2071 | has a pending status, then don't resume any threads - we can just | |
2072 | report the pending status. Make sure to queue any signals | |
bd99dc85 PA |
2073 | that would otherwise be sent. In non-stop mode, we'll apply this |
2074 | logic to each thread individually. */ | |
5544ad89 | 2075 | pending_flag = 0; |
bd99dc85 PA |
2076 | if (!non_stop) |
2077 | find_inferior (&all_lwps, resume_status_pending_p, &pending_flag); | |
5544ad89 DJ |
2078 | |
2079 | if (debug_threads) | |
2080 | { | |
2081 | if (pending_flag) | |
2082 | fprintf (stderr, "Not resuming, pending status\n"); | |
2083 | else | |
2084 | fprintf (stderr, "Resuming, no pending status\n"); | |
2085 | } | |
2086 | ||
bd99dc85 | 2087 | find_inferior (&all_threads, linux_resume_one_thread, &pending_flag); |
0d62e5e8 DJ |
2088 | } |
2089 | ||
2090 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
2091 | |
2092 | int | |
0a30fbc4 | 2093 | register_addr (int regnum) |
da6d8c04 DJ |
2094 | { |
2095 | int addr; | |
2096 | ||
2ec06d2e | 2097 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
2098 | error ("Invalid register number %d.", regnum); |
2099 | ||
2ec06d2e | 2100 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2101 | |
2102 | return addr; | |
2103 | } | |
2104 | ||
58caa3dc | 2105 | /* Fetch one register. */ |
da6d8c04 DJ |
2106 | static void |
2107 | fetch_register (int regno) | |
2108 | { | |
2109 | CORE_ADDR regaddr; | |
48d93c75 | 2110 | int i, size; |
0d62e5e8 | 2111 | char *buf; |
95954743 | 2112 | int pid; |
da6d8c04 | 2113 | |
2ec06d2e | 2114 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2115 | return; |
2ec06d2e | 2116 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2117 | return; |
da6d8c04 | 2118 | |
0a30fbc4 DJ |
2119 | regaddr = register_addr (regno); |
2120 | if (regaddr == -1) | |
2121 | return; | |
95954743 PA |
2122 | |
2123 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2124 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2125 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2126 | buf = alloca (size); |
2127 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2128 | { |
2129 | errno = 0; | |
0d62e5e8 | 2130 | *(PTRACE_XFER_TYPE *) (buf + i) = |
95954743 | 2131 | ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
da6d8c04 DJ |
2132 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2133 | if (errno != 0) | |
2134 | { | |
2135 | /* Warning, not error, in case we are attached; sometimes the | |
2136 | kernel doesn't let us at the registers. */ | |
2137 | char *err = strerror (errno); | |
2138 | char *msg = alloca (strlen (err) + 128); | |
2139 | sprintf (msg, "reading register %d: %s", regno, err); | |
2140 | error (msg); | |
2141 | goto error_exit; | |
2142 | } | |
2143 | } | |
ee1a7ae4 UW |
2144 | |
2145 | if (the_low_target.supply_ptrace_register) | |
2146 | the_low_target.supply_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2147 | else |
2148 | supply_register (regno, buf); | |
0d62e5e8 | 2149 | |
da6d8c04 DJ |
2150 | error_exit:; |
2151 | } | |
2152 | ||
2153 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
2154 | static void |
2155 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 | 2156 | { |
4463ce24 | 2157 | if (regno == -1) |
2ec06d2e | 2158 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
2159 | fetch_register (regno); |
2160 | else | |
2161 | fetch_register (regno); | |
2162 | } | |
2163 | ||
2164 | /* Store our register values back into the inferior. | |
2165 | If REGNO is -1, do this for all registers. | |
2166 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
2167 | static void |
2168 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
2169 | { |
2170 | CORE_ADDR regaddr; | |
48d93c75 | 2171 | int i, size; |
0d62e5e8 | 2172 | char *buf; |
55ac2b99 | 2173 | int pid; |
da6d8c04 DJ |
2174 | |
2175 | if (regno >= 0) | |
2176 | { | |
2ec06d2e | 2177 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2178 | return; |
2179 | ||
bc1e36ca | 2180 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2181 | return; |
2182 | ||
2183 | regaddr = register_addr (regno); | |
2184 | if (regaddr == -1) | |
da6d8c04 | 2185 | return; |
da6d8c04 | 2186 | errno = 0; |
48d93c75 UW |
2187 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2188 | & - sizeof (PTRACE_XFER_TYPE); | |
2189 | buf = alloca (size); | |
2190 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2191 | |
2192 | if (the_low_target.collect_ptrace_register) | |
2193 | the_low_target.collect_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2194 | else |
2195 | collect_register (regno, buf); | |
ee1a7ae4 | 2196 | |
95954743 | 2197 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2198 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2199 | { |
0a30fbc4 | 2200 | errno = 0; |
95954743 | 2201 | ptrace (PTRACE_POKEUSER, pid, (PTRACE_ARG3_TYPE) regaddr, |
2ff29de4 | 2202 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
2203 | if (errno != 0) |
2204 | { | |
1b3f6016 PA |
2205 | /* At this point, ESRCH should mean the process is |
2206 | already gone, in which case we simply ignore attempts | |
2207 | to change its registers. See also the related | |
2208 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2209 | if (errno == ESRCH) |
2210 | return; | |
2211 | ||
bc1e36ca DJ |
2212 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
2213 | { | |
2214 | char *err = strerror (errno); | |
2215 | char *msg = alloca (strlen (err) + 128); | |
2216 | sprintf (msg, "writing register %d: %s", | |
2217 | regno, err); | |
2218 | error (msg); | |
2219 | return; | |
2220 | } | |
da6d8c04 | 2221 | } |
2ff29de4 | 2222 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2223 | } |
da6d8c04 DJ |
2224 | } |
2225 | else | |
2ec06d2e | 2226 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 2227 | usr_store_inferior_registers (regno); |
da6d8c04 | 2228 | } |
58caa3dc DJ |
2229 | #endif /* HAVE_LINUX_USRREGS */ |
2230 | ||
2231 | ||
2232 | ||
2233 | #ifdef HAVE_LINUX_REGSETS | |
2234 | ||
2235 | static int | |
0d62e5e8 | 2236 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
2237 | { |
2238 | struct regset_info *regset; | |
e9d25b98 | 2239 | int saw_general_regs = 0; |
95954743 | 2240 | int pid; |
58caa3dc DJ |
2241 | |
2242 | regset = target_regsets; | |
2243 | ||
95954743 | 2244 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2245 | while (regset->size >= 0) |
2246 | { | |
2247 | void *buf; | |
2248 | int res; | |
2249 | ||
52fa2412 | 2250 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2251 | { |
2252 | regset ++; | |
2253 | continue; | |
2254 | } | |
2255 | ||
bca929d3 | 2256 | buf = xmalloc (regset->size); |
dfb64f85 | 2257 | #ifndef __sparc__ |
95954743 | 2258 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2259 | #else |
95954743 | 2260 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2261 | #endif |
58caa3dc DJ |
2262 | if (res < 0) |
2263 | { | |
2264 | if (errno == EIO) | |
2265 | { | |
52fa2412 UW |
2266 | /* If we get EIO on a regset, do not try it again for |
2267 | this process. */ | |
2268 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2269 | free (buf); |
52fa2412 | 2270 | continue; |
58caa3dc DJ |
2271 | } |
2272 | else | |
2273 | { | |
0d62e5e8 | 2274 | char s[256]; |
95954743 PA |
2275 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
2276 | pid); | |
0d62e5e8 | 2277 | perror (s); |
58caa3dc DJ |
2278 | } |
2279 | } | |
e9d25b98 DJ |
2280 | else if (regset->type == GENERAL_REGS) |
2281 | saw_general_regs = 1; | |
58caa3dc DJ |
2282 | regset->store_function (buf); |
2283 | regset ++; | |
fdeb2a12 | 2284 | free (buf); |
58caa3dc | 2285 | } |
e9d25b98 DJ |
2286 | if (saw_general_regs) |
2287 | return 0; | |
2288 | else | |
2289 | return 1; | |
58caa3dc DJ |
2290 | } |
2291 | ||
2292 | static int | |
0d62e5e8 | 2293 | regsets_store_inferior_registers () |
58caa3dc DJ |
2294 | { |
2295 | struct regset_info *regset; | |
e9d25b98 | 2296 | int saw_general_regs = 0; |
95954743 | 2297 | int pid; |
58caa3dc DJ |
2298 | |
2299 | regset = target_regsets; | |
2300 | ||
95954743 | 2301 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2302 | while (regset->size >= 0) |
2303 | { | |
2304 | void *buf; | |
2305 | int res; | |
2306 | ||
52fa2412 | 2307 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2308 | { |
2309 | regset ++; | |
2310 | continue; | |
2311 | } | |
2312 | ||
bca929d3 | 2313 | buf = xmalloc (regset->size); |
545587ee DJ |
2314 | |
2315 | /* First fill the buffer with the current register set contents, | |
2316 | in case there are any items in the kernel's regset that are | |
2317 | not in gdbserver's regcache. */ | |
dfb64f85 | 2318 | #ifndef __sparc__ |
95954743 | 2319 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2320 | #else |
95954743 | 2321 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2322 | #endif |
545587ee DJ |
2323 | |
2324 | if (res == 0) | |
2325 | { | |
2326 | /* Then overlay our cached registers on that. */ | |
2327 | regset->fill_function (buf); | |
2328 | ||
2329 | /* Only now do we write the register set. */ | |
dfb64f85 | 2330 | #ifndef __sparc__ |
95954743 | 2331 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 2332 | #else |
95954743 | 2333 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 2334 | #endif |
545587ee DJ |
2335 | } |
2336 | ||
58caa3dc DJ |
2337 | if (res < 0) |
2338 | { | |
2339 | if (errno == EIO) | |
2340 | { | |
52fa2412 UW |
2341 | /* If we get EIO on a regset, do not try it again for |
2342 | this process. */ | |
2343 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2344 | free (buf); |
52fa2412 | 2345 | continue; |
58caa3dc | 2346 | } |
3221518c UW |
2347 | else if (errno == ESRCH) |
2348 | { | |
1b3f6016 PA |
2349 | /* At this point, ESRCH should mean the process is |
2350 | already gone, in which case we simply ignore attempts | |
2351 | to change its registers. See also the related | |
2352 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 2353 | free (buf); |
3221518c UW |
2354 | return 0; |
2355 | } | |
58caa3dc DJ |
2356 | else |
2357 | { | |
ce3a066d | 2358 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
2359 | } |
2360 | } | |
e9d25b98 DJ |
2361 | else if (regset->type == GENERAL_REGS) |
2362 | saw_general_regs = 1; | |
58caa3dc | 2363 | regset ++; |
09ec9b38 | 2364 | free (buf); |
58caa3dc | 2365 | } |
e9d25b98 DJ |
2366 | if (saw_general_regs) |
2367 | return 0; | |
2368 | else | |
2369 | return 1; | |
ce3a066d | 2370 | return 0; |
58caa3dc DJ |
2371 | } |
2372 | ||
2373 | #endif /* HAVE_LINUX_REGSETS */ | |
2374 | ||
2375 | ||
2376 | void | |
ce3a066d | 2377 | linux_fetch_registers (int regno) |
58caa3dc DJ |
2378 | { |
2379 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2380 | if (regsets_fetch_inferior_registers () == 0) |
2381 | return; | |
58caa3dc DJ |
2382 | #endif |
2383 | #ifdef HAVE_LINUX_USRREGS | |
2384 | usr_fetch_inferior_registers (regno); | |
2385 | #endif | |
2386 | } | |
2387 | ||
2388 | void | |
ce3a066d | 2389 | linux_store_registers (int regno) |
58caa3dc DJ |
2390 | { |
2391 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2392 | if (regsets_store_inferior_registers () == 0) |
2393 | return; | |
58caa3dc DJ |
2394 | #endif |
2395 | #ifdef HAVE_LINUX_USRREGS | |
2396 | usr_store_inferior_registers (regno); | |
2397 | #endif | |
2398 | } | |
2399 | ||
da6d8c04 | 2400 | |
da6d8c04 DJ |
2401 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
2402 | to debugger memory starting at MYADDR. */ | |
2403 | ||
c3e735a6 | 2404 | static int |
f450004a | 2405 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
2406 | { |
2407 | register int i; | |
2408 | /* Round starting address down to longword boundary. */ | |
2409 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2410 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
2411 | register int count |
2412 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
2413 | / sizeof (PTRACE_XFER_TYPE); |
2414 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 2415 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 2416 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
2417 | int fd; |
2418 | char filename[64]; | |
95954743 | 2419 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
2420 | |
2421 | /* Try using /proc. Don't bother for one word. */ | |
2422 | if (len >= 3 * sizeof (long)) | |
2423 | { | |
2424 | /* We could keep this file open and cache it - possibly one per | |
2425 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 2426 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
2427 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
2428 | if (fd == -1) | |
2429 | goto no_proc; | |
2430 | ||
2431 | /* If pread64 is available, use it. It's faster if the kernel | |
2432 | supports it (only one syscall), and it's 64-bit safe even on | |
2433 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
2434 | application). */ | |
2435 | #ifdef HAVE_PREAD64 | |
2436 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
2437 | #else | |
1de1badb | 2438 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
2439 | #endif |
2440 | { | |
2441 | close (fd); | |
2442 | goto no_proc; | |
2443 | } | |
2444 | ||
2445 | close (fd); | |
2446 | return 0; | |
2447 | } | |
da6d8c04 | 2448 | |
fd462a61 | 2449 | no_proc: |
da6d8c04 DJ |
2450 | /* Read all the longwords */ |
2451 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2452 | { | |
c3e735a6 | 2453 | errno = 0; |
95954743 | 2454 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
c3e735a6 DJ |
2455 | if (errno) |
2456 | return errno; | |
da6d8c04 DJ |
2457 | } |
2458 | ||
2459 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
2460 | memcpy (myaddr, |
2461 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
2462 | len); | |
c3e735a6 DJ |
2463 | |
2464 | return 0; | |
da6d8c04 DJ |
2465 | } |
2466 | ||
2467 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
2468 | to inferior's memory at MEMADDR. | |
2469 | On failure (cannot write the inferior) | |
2470 | returns the value of errno. */ | |
2471 | ||
ce3a066d | 2472 | static int |
f450004a | 2473 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
2474 | { |
2475 | register int i; | |
2476 | /* Round starting address down to longword boundary. */ | |
2477 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2478 | /* Round ending address up; get number of longwords that makes. */ | |
2479 | register int count | |
2480 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
2481 | /* Allocate buffer of that many longwords. */ | |
2482 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 2483 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 2484 | |
0d62e5e8 DJ |
2485 | if (debug_threads) |
2486 | { | |
58d6951d DJ |
2487 | /* Dump up to four bytes. */ |
2488 | unsigned int val = * (unsigned int *) myaddr; | |
2489 | if (len == 1) | |
2490 | val = val & 0xff; | |
2491 | else if (len == 2) | |
2492 | val = val & 0xffff; | |
2493 | else if (len == 3) | |
2494 | val = val & 0xffffff; | |
2495 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
2496 | val, (long)memaddr); | |
0d62e5e8 DJ |
2497 | } |
2498 | ||
da6d8c04 DJ |
2499 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
2500 | ||
95954743 | 2501 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
da6d8c04 DJ |
2502 | |
2503 | if (count > 1) | |
2504 | { | |
2505 | buffer[count - 1] | |
95954743 | 2506 | = ptrace (PTRACE_PEEKTEXT, pid, |
d844cde6 DJ |
2507 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
2508 | * sizeof (PTRACE_XFER_TYPE)), | |
2509 | 0); | |
da6d8c04 DJ |
2510 | } |
2511 | ||
2512 | /* Copy data to be written over corresponding part of buffer */ | |
2513 | ||
2514 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
2515 | ||
2516 | /* Write the entire buffer. */ | |
2517 | ||
2518 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2519 | { | |
2520 | errno = 0; | |
95954743 | 2521 | ptrace (PTRACE_POKETEXT, pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
2522 | if (errno) |
2523 | return errno; | |
2524 | } | |
2525 | ||
2526 | return 0; | |
2527 | } | |
2f2893d9 | 2528 | |
24a09b5f DJ |
2529 | static int linux_supports_tracefork_flag; |
2530 | ||
51c2684e | 2531 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 2532 | |
51c2684e DJ |
2533 | static int |
2534 | linux_tracefork_grandchild (void *arg) | |
2535 | { | |
2536 | _exit (0); | |
2537 | } | |
2538 | ||
7407e2de AS |
2539 | #define STACK_SIZE 4096 |
2540 | ||
51c2684e DJ |
2541 | static int |
2542 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
2543 | { |
2544 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
2545 | kill (getpid (), SIGSTOP); | |
7407e2de AS |
2546 | #ifdef __ia64__ |
2547 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
2548 | CLONE_VM | SIGCHLD, NULL); | |
2549 | #else | |
2550 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
2551 | CLONE_VM | SIGCHLD, NULL); | |
2552 | #endif | |
24a09b5f DJ |
2553 | _exit (0); |
2554 | } | |
2555 | ||
24a09b5f DJ |
2556 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
2557 | sure that we can enable the option, and that it had the desired | |
2558 | effect. */ | |
2559 | ||
2560 | static void | |
2561 | linux_test_for_tracefork (void) | |
2562 | { | |
2563 | int child_pid, ret, status; | |
2564 | long second_pid; | |
bca929d3 | 2565 | char *stack = xmalloc (STACK_SIZE * 4); |
24a09b5f DJ |
2566 | |
2567 | linux_supports_tracefork_flag = 0; | |
2568 | ||
51c2684e | 2569 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
2570 | #ifdef __ia64__ |
2571 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
2572 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2573 | #else | |
2574 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, | |
2575 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2576 | #endif | |
24a09b5f | 2577 | if (child_pid == -1) |
51c2684e | 2578 | perror_with_name ("clone"); |
24a09b5f DJ |
2579 | |
2580 | ret = my_waitpid (child_pid, &status, 0); | |
2581 | if (ret == -1) | |
2582 | perror_with_name ("waitpid"); | |
2583 | else if (ret != child_pid) | |
2584 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
2585 | if (! WIFSTOPPED (status)) | |
2586 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
2587 | ||
2588 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); | |
2589 | if (ret != 0) | |
2590 | { | |
2591 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2592 | if (ret != 0) | |
2593 | { | |
2594 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2595 | return; | |
2596 | } | |
2597 | ||
2598 | ret = my_waitpid (child_pid, &status, 0); | |
2599 | if (ret != child_pid) | |
2600 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
2601 | else if (!WIFSIGNALED (status)) | |
2602 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
2603 | "killed child", status); | |
2604 | ||
2605 | return; | |
2606 | } | |
2607 | ||
2608 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
2609 | if (ret != 0) | |
2610 | warning ("linux_test_for_tracefork: failed to resume child"); | |
2611 | ||
2612 | ret = my_waitpid (child_pid, &status, 0); | |
2613 | ||
2614 | if (ret == child_pid && WIFSTOPPED (status) | |
2615 | && status >> 16 == PTRACE_EVENT_FORK) | |
2616 | { | |
2617 | second_pid = 0; | |
2618 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
2619 | if (ret == 0 && second_pid != 0) | |
2620 | { | |
2621 | int second_status; | |
2622 | ||
2623 | linux_supports_tracefork_flag = 1; | |
2624 | my_waitpid (second_pid, &second_status, 0); | |
2625 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
2626 | if (ret != 0) | |
2627 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
2628 | my_waitpid (second_pid, &status, 0); | |
2629 | } | |
2630 | } | |
2631 | else | |
2632 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
2633 | "(%d, status 0x%x)", ret, status); | |
2634 | ||
2635 | do | |
2636 | { | |
2637 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2638 | if (ret != 0) | |
2639 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2640 | my_waitpid (child_pid, &status, 0); | |
2641 | } | |
2642 | while (WIFSTOPPED (status)); | |
51c2684e DJ |
2643 | |
2644 | free (stack); | |
24a09b5f DJ |
2645 | } |
2646 | ||
2647 | ||
2f2893d9 DJ |
2648 | static void |
2649 | linux_look_up_symbols (void) | |
2650 | { | |
0d62e5e8 | 2651 | #ifdef USE_THREAD_DB |
95954743 PA |
2652 | struct process_info *proc = current_process (); |
2653 | ||
cdbfd419 | 2654 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
2655 | return; |
2656 | ||
cdbfd419 | 2657 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
2658 | #endif |
2659 | } | |
2660 | ||
e5379b03 | 2661 | static void |
ef57601b | 2662 | linux_request_interrupt (void) |
e5379b03 | 2663 | { |
a1928bad | 2664 | extern unsigned long signal_pid; |
e5379b03 | 2665 | |
95954743 PA |
2666 | if (!ptid_equal (cont_thread, null_ptid) |
2667 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 2668 | { |
54a0b537 | 2669 | struct lwp_info *lwp; |
bd99dc85 | 2670 | int lwpid; |
e5379b03 | 2671 | |
54a0b537 | 2672 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
2673 | lwpid = lwpid_of (lwp); |
2674 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
2675 | } |
2676 | else | |
ef57601b | 2677 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
2678 | } |
2679 | ||
aa691b87 RM |
2680 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
2681 | to debugger memory starting at MYADDR. */ | |
2682 | ||
2683 | static int | |
f450004a | 2684 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
2685 | { |
2686 | char filename[PATH_MAX]; | |
2687 | int fd, n; | |
95954743 | 2688 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 2689 | |
95954743 | 2690 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
2691 | |
2692 | fd = open (filename, O_RDONLY); | |
2693 | if (fd < 0) | |
2694 | return -1; | |
2695 | ||
2696 | if (offset != (CORE_ADDR) 0 | |
2697 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
2698 | n = -1; | |
2699 | else | |
2700 | n = read (fd, myaddr, len); | |
2701 | ||
2702 | close (fd); | |
2703 | ||
2704 | return n; | |
2705 | } | |
2706 | ||
d993e290 PA |
2707 | /* These breakpoint and watchpoint related wrapper functions simply |
2708 | pass on the function call if the target has registered a | |
2709 | corresponding function. */ | |
e013ee27 OF |
2710 | |
2711 | static int | |
d993e290 | 2712 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2713 | { |
d993e290 PA |
2714 | if (the_low_target.insert_point != NULL) |
2715 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
2716 | else |
2717 | /* Unsupported (see target.h). */ | |
2718 | return 1; | |
2719 | } | |
2720 | ||
2721 | static int | |
d993e290 | 2722 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2723 | { |
d993e290 PA |
2724 | if (the_low_target.remove_point != NULL) |
2725 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
2726 | else |
2727 | /* Unsupported (see target.h). */ | |
2728 | return 1; | |
2729 | } | |
2730 | ||
2731 | static int | |
2732 | linux_stopped_by_watchpoint (void) | |
2733 | { | |
2734 | if (the_low_target.stopped_by_watchpoint != NULL) | |
2735 | return the_low_target.stopped_by_watchpoint (); | |
2736 | else | |
2737 | return 0; | |
2738 | } | |
2739 | ||
2740 | static CORE_ADDR | |
2741 | linux_stopped_data_address (void) | |
2742 | { | |
2743 | if (the_low_target.stopped_data_address != NULL) | |
2744 | return the_low_target.stopped_data_address (); | |
2745 | else | |
2746 | return 0; | |
2747 | } | |
2748 | ||
42c81e2a | 2749 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
2750 | #if defined(__mcoldfire__) |
2751 | /* These should really be defined in the kernel's ptrace.h header. */ | |
2752 | #define PT_TEXT_ADDR 49*4 | |
2753 | #define PT_DATA_ADDR 50*4 | |
2754 | #define PT_TEXT_END_ADDR 51*4 | |
2755 | #endif | |
2756 | ||
2757 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
2758 | to tell gdb about. */ | |
2759 | ||
2760 | static int | |
2761 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
2762 | { | |
2763 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
2764 | unsigned long text, text_end, data; | |
bd99dc85 | 2765 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
2766 | |
2767 | errno = 0; | |
2768 | ||
2769 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
2770 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
2771 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
2772 | ||
2773 | if (errno == 0) | |
2774 | { | |
2775 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
2776 | used by gdb) are relative to the beginning of the program, |
2777 | with the data segment immediately following the text segment. | |
2778 | However, the actual runtime layout in memory may put the data | |
2779 | somewhere else, so when we send gdb a data base-address, we | |
2780 | use the real data base address and subtract the compile-time | |
2781 | data base-address from it (which is just the length of the | |
2782 | text segment). BSS immediately follows data in both | |
2783 | cases. */ | |
52fb6437 NS |
2784 | *text_p = text; |
2785 | *data_p = data - (text_end - text); | |
1b3f6016 | 2786 | |
52fb6437 NS |
2787 | return 1; |
2788 | } | |
2789 | #endif | |
2790 | return 0; | |
2791 | } | |
2792 | #endif | |
2793 | ||
07e059b5 VP |
2794 | static int |
2795 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
2796 | unsigned char *readbuf, unsigned const char *writebuf, |
2797 | CORE_ADDR offset, int len) | |
07e059b5 VP |
2798 | { |
2799 | /* We make the process list snapshot when the object starts to be | |
2800 | read. */ | |
2801 | static const char *buf; | |
2802 | static long len_avail = -1; | |
2803 | static struct buffer buffer; | |
2804 | ||
2805 | DIR *dirp; | |
2806 | ||
2807 | if (strcmp (annex, "processes") != 0) | |
2808 | return 0; | |
2809 | ||
2810 | if (!readbuf || writebuf) | |
2811 | return 0; | |
2812 | ||
2813 | if (offset == 0) | |
2814 | { | |
2815 | if (len_avail != -1 && len_avail != 0) | |
2816 | buffer_free (&buffer); | |
2817 | len_avail = 0; | |
2818 | buf = NULL; | |
2819 | buffer_init (&buffer); | |
2820 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
2821 | ||
2822 | dirp = opendir ("/proc"); | |
2823 | if (dirp) | |
2824 | { | |
1b3f6016 PA |
2825 | struct dirent *dp; |
2826 | while ((dp = readdir (dirp)) != NULL) | |
2827 | { | |
2828 | struct stat statbuf; | |
2829 | char procentry[sizeof ("/proc/4294967295")]; | |
2830 | ||
2831 | if (!isdigit (dp->d_name[0]) | |
2832 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
2833 | continue; | |
2834 | ||
2835 | sprintf (procentry, "/proc/%s", dp->d_name); | |
2836 | if (stat (procentry, &statbuf) == 0 | |
2837 | && S_ISDIR (statbuf.st_mode)) | |
2838 | { | |
2839 | char pathname[128]; | |
2840 | FILE *f; | |
2841 | char cmd[MAXPATHLEN + 1]; | |
2842 | struct passwd *entry; | |
2843 | ||
2844 | sprintf (pathname, "/proc/%s/cmdline", dp->d_name); | |
2845 | entry = getpwuid (statbuf.st_uid); | |
2846 | ||
2847 | if ((f = fopen (pathname, "r")) != NULL) | |
2848 | { | |
2849 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
2850 | if (len > 0) | |
2851 | { | |
2852 | int i; | |
2853 | for (i = 0; i < len; i++) | |
2854 | if (cmd[i] == '\0') | |
2855 | cmd[i] = ' '; | |
2856 | cmd[len] = '\0'; | |
2857 | ||
2858 | buffer_xml_printf ( | |
07e059b5 VP |
2859 | &buffer, |
2860 | "<item>" | |
2861 | "<column name=\"pid\">%s</column>" | |
2862 | "<column name=\"user\">%s</column>" | |
2863 | "<column name=\"command\">%s</column>" | |
2864 | "</item>", | |
2865 | dp->d_name, | |
2866 | entry ? entry->pw_name : "?", | |
2867 | cmd); | |
1b3f6016 PA |
2868 | } |
2869 | fclose (f); | |
2870 | } | |
2871 | } | |
2872 | } | |
07e059b5 | 2873 | |
1b3f6016 | 2874 | closedir (dirp); |
07e059b5 VP |
2875 | } |
2876 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
2877 | buf = buffer_finish (&buffer); | |
2878 | len_avail = strlen (buf); | |
2879 | } | |
2880 | ||
2881 | if (offset >= len_avail) | |
2882 | { | |
2883 | /* Done. Get rid of the data. */ | |
2884 | buffer_free (&buffer); | |
2885 | buf = NULL; | |
2886 | len_avail = 0; | |
2887 | return 0; | |
2888 | } | |
2889 | ||
2890 | if (len > len_avail - offset) | |
2891 | len = len_avail - offset; | |
2892 | memcpy (readbuf, buf + offset, len); | |
2893 | ||
2894 | return len; | |
2895 | } | |
2896 | ||
d0722149 DE |
2897 | /* Convert a native/host siginfo object, into/from the siginfo in the |
2898 | layout of the inferiors' architecture. */ | |
2899 | ||
2900 | static void | |
2901 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
2902 | { | |
2903 | int done = 0; | |
2904 | ||
2905 | if (the_low_target.siginfo_fixup != NULL) | |
2906 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
2907 | ||
2908 | /* If there was no callback, or the callback didn't do anything, | |
2909 | then just do a straight memcpy. */ | |
2910 | if (!done) | |
2911 | { | |
2912 | if (direction == 1) | |
2913 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
2914 | else | |
2915 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
2916 | } | |
2917 | } | |
2918 | ||
4aa995e1 PA |
2919 | static int |
2920 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
2921 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
2922 | { | |
d0722149 | 2923 | int pid; |
4aa995e1 | 2924 | struct siginfo siginfo; |
d0722149 | 2925 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
2926 | |
2927 | if (current_inferior == NULL) | |
2928 | return -1; | |
2929 | ||
bd99dc85 | 2930 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
2931 | |
2932 | if (debug_threads) | |
d0722149 | 2933 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
2934 | readbuf != NULL ? "Reading" : "Writing", |
2935 | pid); | |
2936 | ||
2937 | if (offset > sizeof (siginfo)) | |
2938 | return -1; | |
2939 | ||
2940 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
2941 | return -1; | |
2942 | ||
d0722149 DE |
2943 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
2944 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
2945 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
2946 | with a 32-bit GDBSERVER, we need to convert it. */ | |
2947 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
2948 | ||
4aa995e1 PA |
2949 | if (offset + len > sizeof (siginfo)) |
2950 | len = sizeof (siginfo) - offset; | |
2951 | ||
2952 | if (readbuf != NULL) | |
d0722149 | 2953 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
2954 | else |
2955 | { | |
d0722149 DE |
2956 | memcpy (inf_siginfo + offset, writebuf, len); |
2957 | ||
2958 | /* Convert back to ptrace layout before flushing it out. */ | |
2959 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
2960 | ||
4aa995e1 PA |
2961 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
2962 | return -1; | |
2963 | } | |
2964 | ||
2965 | return len; | |
2966 | } | |
2967 | ||
bd99dc85 PA |
2968 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
2969 | so we notice when children change state; as the handler for the | |
2970 | sigsuspend in my_waitpid. */ | |
2971 | ||
2972 | static void | |
2973 | sigchld_handler (int signo) | |
2974 | { | |
2975 | int old_errno = errno; | |
2976 | ||
2977 | if (debug_threads) | |
2978 | /* fprintf is not async-signal-safe, so call write directly. */ | |
2979 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
2980 | ||
2981 | if (target_is_async_p ()) | |
2982 | async_file_mark (); /* trigger a linux_wait */ | |
2983 | ||
2984 | errno = old_errno; | |
2985 | } | |
2986 | ||
2987 | static int | |
2988 | linux_supports_non_stop (void) | |
2989 | { | |
2990 | return 1; | |
2991 | } | |
2992 | ||
2993 | static int | |
2994 | linux_async (int enable) | |
2995 | { | |
2996 | int previous = (linux_event_pipe[0] != -1); | |
2997 | ||
2998 | if (previous != enable) | |
2999 | { | |
3000 | sigset_t mask; | |
3001 | sigemptyset (&mask); | |
3002 | sigaddset (&mask, SIGCHLD); | |
3003 | ||
3004 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
3005 | ||
3006 | if (enable) | |
3007 | { | |
3008 | if (pipe (linux_event_pipe) == -1) | |
3009 | fatal ("creating event pipe failed."); | |
3010 | ||
3011 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
3012 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
3013 | ||
3014 | /* Register the event loop handler. */ | |
3015 | add_file_handler (linux_event_pipe[0], | |
3016 | handle_target_event, NULL); | |
3017 | ||
3018 | /* Always trigger a linux_wait. */ | |
3019 | async_file_mark (); | |
3020 | } | |
3021 | else | |
3022 | { | |
3023 | delete_file_handler (linux_event_pipe[0]); | |
3024 | ||
3025 | close (linux_event_pipe[0]); | |
3026 | close (linux_event_pipe[1]); | |
3027 | linux_event_pipe[0] = -1; | |
3028 | linux_event_pipe[1] = -1; | |
3029 | } | |
3030 | ||
3031 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
3032 | } | |
3033 | ||
3034 | return previous; | |
3035 | } | |
3036 | ||
3037 | static int | |
3038 | linux_start_non_stop (int nonstop) | |
3039 | { | |
3040 | /* Register or unregister from event-loop accordingly. */ | |
3041 | linux_async (nonstop); | |
3042 | return 0; | |
3043 | } | |
3044 | ||
cf8fd78b PA |
3045 | static int |
3046 | linux_supports_multi_process (void) | |
3047 | { | |
3048 | return 1; | |
3049 | } | |
3050 | ||
efcbbd14 UW |
3051 | |
3052 | /* Enumerate spufs IDs for process PID. */ | |
3053 | static int | |
3054 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
3055 | { | |
3056 | int pos = 0; | |
3057 | int written = 0; | |
3058 | char path[128]; | |
3059 | DIR *dir; | |
3060 | struct dirent *entry; | |
3061 | ||
3062 | sprintf (path, "/proc/%ld/fd", pid); | |
3063 | dir = opendir (path); | |
3064 | if (!dir) | |
3065 | return -1; | |
3066 | ||
3067 | rewinddir (dir); | |
3068 | while ((entry = readdir (dir)) != NULL) | |
3069 | { | |
3070 | struct stat st; | |
3071 | struct statfs stfs; | |
3072 | int fd; | |
3073 | ||
3074 | fd = atoi (entry->d_name); | |
3075 | if (!fd) | |
3076 | continue; | |
3077 | ||
3078 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
3079 | if (stat (path, &st) != 0) | |
3080 | continue; | |
3081 | if (!S_ISDIR (st.st_mode)) | |
3082 | continue; | |
3083 | ||
3084 | if (statfs (path, &stfs) != 0) | |
3085 | continue; | |
3086 | if (stfs.f_type != SPUFS_MAGIC) | |
3087 | continue; | |
3088 | ||
3089 | if (pos >= offset && pos + 4 <= offset + len) | |
3090 | { | |
3091 | *(unsigned int *)(buf + pos - offset) = fd; | |
3092 | written += 4; | |
3093 | } | |
3094 | pos += 4; | |
3095 | } | |
3096 | ||
3097 | closedir (dir); | |
3098 | return written; | |
3099 | } | |
3100 | ||
3101 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
3102 | object type, using the /proc file system. */ | |
3103 | static int | |
3104 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
3105 | unsigned const char *writebuf, | |
3106 | CORE_ADDR offset, int len) | |
3107 | { | |
3108 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
3109 | char buf[128]; | |
3110 | int fd = 0; | |
3111 | int ret = 0; | |
3112 | ||
3113 | if (!writebuf && !readbuf) | |
3114 | return -1; | |
3115 | ||
3116 | if (!*annex) | |
3117 | { | |
3118 | if (!readbuf) | |
3119 | return -1; | |
3120 | else | |
3121 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
3122 | } | |
3123 | ||
3124 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
3125 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
3126 | if (fd <= 0) | |
3127 | return -1; | |
3128 | ||
3129 | if (offset != 0 | |
3130 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
3131 | { | |
3132 | close (fd); | |
3133 | return 0; | |
3134 | } | |
3135 | ||
3136 | if (writebuf) | |
3137 | ret = write (fd, writebuf, (size_t) len); | |
3138 | else | |
3139 | ret = read (fd, readbuf, (size_t) len); | |
3140 | ||
3141 | close (fd); | |
3142 | return ret; | |
3143 | } | |
3144 | ||
ce3a066d DJ |
3145 | static struct target_ops linux_target_ops = { |
3146 | linux_create_inferior, | |
3147 | linux_attach, | |
3148 | linux_kill, | |
6ad8ae5c | 3149 | linux_detach, |
444d6139 | 3150 | linux_join, |
ce3a066d DJ |
3151 | linux_thread_alive, |
3152 | linux_resume, | |
3153 | linux_wait, | |
3154 | linux_fetch_registers, | |
3155 | linux_store_registers, | |
3156 | linux_read_memory, | |
3157 | linux_write_memory, | |
2f2893d9 | 3158 | linux_look_up_symbols, |
ef57601b | 3159 | linux_request_interrupt, |
aa691b87 | 3160 | linux_read_auxv, |
d993e290 PA |
3161 | linux_insert_point, |
3162 | linux_remove_point, | |
e013ee27 OF |
3163 | linux_stopped_by_watchpoint, |
3164 | linux_stopped_data_address, | |
42c81e2a | 3165 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 3166 | linux_read_offsets, |
dae5f5cf DJ |
3167 | #else |
3168 | NULL, | |
3169 | #endif | |
3170 | #ifdef USE_THREAD_DB | |
3171 | thread_db_get_tls_address, | |
3172 | #else | |
3173 | NULL, | |
52fb6437 | 3174 | #endif |
efcbbd14 | 3175 | linux_qxfer_spu, |
59a016f0 | 3176 | hostio_last_error_from_errno, |
07e059b5 | 3177 | linux_qxfer_osdata, |
4aa995e1 | 3178 | linux_xfer_siginfo, |
bd99dc85 PA |
3179 | linux_supports_non_stop, |
3180 | linux_async, | |
3181 | linux_start_non_stop, | |
cdbfd419 PP |
3182 | linux_supports_multi_process, |
3183 | #ifdef USE_THREAD_DB | |
3184 | thread_db_handle_monitor_command | |
3185 | #else | |
3186 | NULL | |
3187 | #endif | |
ce3a066d DJ |
3188 | }; |
3189 | ||
0d62e5e8 DJ |
3190 | static void |
3191 | linux_init_signals () | |
3192 | { | |
3193 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
3194 | to find what the cancel signal actually is. */ | |
254787d4 | 3195 | signal (__SIGRTMIN+1, SIG_IGN); |
0d62e5e8 DJ |
3196 | } |
3197 | ||
da6d8c04 DJ |
3198 | void |
3199 | initialize_low (void) | |
3200 | { | |
bd99dc85 PA |
3201 | struct sigaction sigchld_action; |
3202 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 3203 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
3204 | set_breakpoint_data (the_low_target.breakpoint, |
3205 | the_low_target.breakpoint_len); | |
0d62e5e8 | 3206 | linux_init_signals (); |
24a09b5f | 3207 | linux_test_for_tracefork (); |
52fa2412 UW |
3208 | #ifdef HAVE_LINUX_REGSETS |
3209 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
3210 | ; | |
bca929d3 | 3211 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 3212 | #endif |
bd99dc85 PA |
3213 | |
3214 | sigchld_action.sa_handler = sigchld_handler; | |
3215 | sigemptyset (&sigchld_action.sa_mask); | |
3216 | sigchld_action.sa_flags = SA_RESTART; | |
3217 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 3218 | } |