Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
545587ee | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
4c38e0a4 | 3 | 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
da6d8c04 DJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
19 | |
20 | #include "server.h" | |
58caa3dc | 21 | #include "linux-low.h" |
da6d8c04 | 22 | |
58caa3dc | 23 | #include <sys/wait.h> |
da6d8c04 DJ |
24 | #include <stdio.h> |
25 | #include <sys/param.h> | |
da6d8c04 | 26 | #include <sys/ptrace.h> |
da6d8c04 DJ |
27 | #include <signal.h> |
28 | #include <sys/ioctl.h> | |
29 | #include <fcntl.h> | |
d07c63e7 | 30 | #include <string.h> |
0a30fbc4 DJ |
31 | #include <stdlib.h> |
32 | #include <unistd.h> | |
fa6a77dc | 33 | #include <errno.h> |
fd500816 | 34 | #include <sys/syscall.h> |
f9387fc3 | 35 | #include <sched.h> |
07e059b5 VP |
36 | #include <ctype.h> |
37 | #include <pwd.h> | |
38 | #include <sys/types.h> | |
39 | #include <dirent.h> | |
efcbbd14 UW |
40 | #include <sys/stat.h> |
41 | #include <sys/vfs.h> | |
957f3f49 DE |
42 | #ifndef ELFMAG0 |
43 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
44 | then ELFMAG0 will have been defined. If it didn't get included by | |
45 | gdb_proc_service.h then including it will likely introduce a duplicate | |
46 | definition of elf_fpregset_t. */ | |
47 | #include <elf.h> | |
48 | #endif | |
efcbbd14 UW |
49 | |
50 | #ifndef SPUFS_MAGIC | |
51 | #define SPUFS_MAGIC 0x23c9b64e | |
52 | #endif | |
da6d8c04 | 53 | |
32ca6d61 DJ |
54 | #ifndef PTRACE_GETSIGINFO |
55 | # define PTRACE_GETSIGINFO 0x4202 | |
56 | # define PTRACE_SETSIGINFO 0x4203 | |
57 | #endif | |
58 | ||
fd462a61 DJ |
59 | #ifndef O_LARGEFILE |
60 | #define O_LARGEFILE 0 | |
61 | #endif | |
62 | ||
24a09b5f DJ |
63 | /* If the system headers did not provide the constants, hard-code the normal |
64 | values. */ | |
65 | #ifndef PTRACE_EVENT_FORK | |
66 | ||
67 | #define PTRACE_SETOPTIONS 0x4200 | |
68 | #define PTRACE_GETEVENTMSG 0x4201 | |
69 | ||
70 | /* options set using PTRACE_SETOPTIONS */ | |
71 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
72 | #define PTRACE_O_TRACEFORK 0x00000002 | |
73 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
74 | #define PTRACE_O_TRACECLONE 0x00000008 | |
75 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
76 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 | |
77 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
78 | ||
79 | /* Wait extended result codes for the above trace options. */ | |
80 | #define PTRACE_EVENT_FORK 1 | |
81 | #define PTRACE_EVENT_VFORK 2 | |
82 | #define PTRACE_EVENT_CLONE 3 | |
83 | #define PTRACE_EVENT_EXEC 4 | |
84 | #define PTRACE_EVENT_VFORK_DONE 5 | |
85 | #define PTRACE_EVENT_EXIT 6 | |
86 | ||
87 | #endif /* PTRACE_EVENT_FORK */ | |
88 | ||
89 | /* We can't always assume that this flag is available, but all systems | |
90 | with the ptrace event handlers also have __WALL, so it's safe to use | |
91 | in some contexts. */ | |
92 | #ifndef __WALL | |
93 | #define __WALL 0x40000000 /* Wait for any child. */ | |
94 | #endif | |
95 | ||
ec8ebe72 DE |
96 | #ifndef W_STOPCODE |
97 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
98 | #endif | |
99 | ||
42c81e2a DJ |
100 | #ifdef __UCLIBC__ |
101 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
102 | #define HAS_NOMMU | |
103 | #endif | |
104 | #endif | |
105 | ||
24a09b5f DJ |
106 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
107 | representation of the thread ID. | |
611cb4a5 | 108 | |
54a0b537 | 109 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
110 | the same as the LWP ID. |
111 | ||
112 | ``all_processes'' is keyed by the "overall process ID", which | |
113 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 114 | |
54a0b537 | 115 | struct inferior_list all_lwps; |
0d62e5e8 | 116 | |
24a09b5f DJ |
117 | /* A list of all unknown processes which receive stop signals. Some other |
118 | process will presumably claim each of these as forked children | |
119 | momentarily. */ | |
120 | ||
121 | struct inferior_list stopped_pids; | |
122 | ||
0d62e5e8 DJ |
123 | /* FIXME this is a bit of a hack, and could be removed. */ |
124 | int stopping_threads; | |
125 | ||
126 | /* FIXME make into a target method? */ | |
24a09b5f | 127 | int using_threads = 1; |
24a09b5f | 128 | |
95954743 PA |
129 | /* This flag is true iff we've just created or attached to our first |
130 | inferior but it has not stopped yet. As soon as it does, we need | |
131 | to call the low target's arch_setup callback. Doing this only on | |
132 | the first inferior avoids reinializing the architecture on every | |
133 | inferior, and avoids messing with the register caches of the | |
134 | already running inferiors. NOTE: this assumes all inferiors under | |
135 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
136 | static int new_inferior; |
137 | ||
2acc282a | 138 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 139 | int step, int signal, siginfo_t *info); |
2bd7c093 | 140 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
54a0b537 | 141 | static void stop_all_lwps (void); |
95954743 | 142 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
54a0b537 | 143 | static int check_removed_breakpoint (struct lwp_info *event_child); |
95954743 | 144 | static void *add_lwp (ptid_t ptid); |
c35fafde | 145 | static int linux_stopped_by_watchpoint (void); |
95954743 | 146 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
dc146f7c | 147 | static int linux_core_of_thread (ptid_t ptid); |
0d62e5e8 DJ |
148 | |
149 | struct pending_signals | |
150 | { | |
151 | int signal; | |
32ca6d61 | 152 | siginfo_t info; |
0d62e5e8 DJ |
153 | struct pending_signals *prev; |
154 | }; | |
611cb4a5 | 155 | |
14ce3065 DE |
156 | #define PTRACE_ARG3_TYPE void * |
157 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 158 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 159 | |
58caa3dc | 160 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
161 | static char *disabled_regsets; |
162 | static int num_regsets; | |
58caa3dc DJ |
163 | #endif |
164 | ||
bd99dc85 PA |
165 | /* The read/write ends of the pipe registered as waitable file in the |
166 | event loop. */ | |
167 | static int linux_event_pipe[2] = { -1, -1 }; | |
168 | ||
169 | /* True if we're currently in async mode. */ | |
170 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
171 | ||
172 | static void send_sigstop (struct inferior_list_entry *entry); | |
173 | static void wait_for_sigstop (struct inferior_list_entry *entry); | |
174 | ||
d0722149 DE |
175 | /* Accepts an integer PID; Returns a string representing a file that |
176 | can be opened to get info for the child process. | |
177 | Space for the result is malloc'd, caller must free. */ | |
178 | ||
179 | char * | |
180 | linux_child_pid_to_exec_file (int pid) | |
181 | { | |
182 | char *name1, *name2; | |
183 | ||
184 | name1 = xmalloc (MAXPATHLEN); | |
185 | name2 = xmalloc (MAXPATHLEN); | |
186 | memset (name2, 0, MAXPATHLEN); | |
187 | ||
188 | sprintf (name1, "/proc/%d/exe", pid); | |
189 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
190 | { | |
191 | free (name1); | |
192 | return name2; | |
193 | } | |
194 | else | |
195 | { | |
196 | free (name2); | |
197 | return name1; | |
198 | } | |
199 | } | |
200 | ||
201 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
202 | ||
203 | static int | |
957f3f49 | 204 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
205 | { |
206 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
207 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
208 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
209 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
210 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
211 | } | |
212 | ||
213 | /* Return non-zero if FILE is a 64-bit ELF file, | |
214 | zero if the file is not a 64-bit ELF file, | |
215 | and -1 if the file is not accessible or doesn't exist. */ | |
216 | ||
217 | int | |
218 | elf_64_file_p (const char *file) | |
219 | { | |
957f3f49 | 220 | Elf64_Ehdr header; |
d0722149 DE |
221 | int fd; |
222 | ||
223 | fd = open (file, O_RDONLY); | |
224 | if (fd < 0) | |
225 | return -1; | |
226 | ||
227 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
228 | { | |
229 | close (fd); | |
230 | return 0; | |
231 | } | |
232 | close (fd); | |
233 | ||
234 | return elf_64_header_p (&header); | |
235 | } | |
236 | ||
bd99dc85 PA |
237 | static void |
238 | delete_lwp (struct lwp_info *lwp) | |
239 | { | |
240 | remove_thread (get_lwp_thread (lwp)); | |
241 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 242 | free (lwp->arch_private); |
bd99dc85 PA |
243 | free (lwp); |
244 | } | |
245 | ||
95954743 PA |
246 | /* Add a process to the common process list, and set its private |
247 | data. */ | |
248 | ||
249 | static struct process_info * | |
250 | linux_add_process (int pid, int attached) | |
251 | { | |
252 | struct process_info *proc; | |
253 | ||
254 | /* Is this the first process? If so, then set the arch. */ | |
255 | if (all_processes.head == NULL) | |
256 | new_inferior = 1; | |
257 | ||
258 | proc = add_process (pid, attached); | |
259 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
260 | ||
aa5ca48f DE |
261 | if (the_low_target.new_process != NULL) |
262 | proc->private->arch_private = the_low_target.new_process (); | |
263 | ||
95954743 PA |
264 | return proc; |
265 | } | |
266 | ||
5091eb23 DE |
267 | /* Remove a process from the common process list, |
268 | also freeing all private data. */ | |
269 | ||
270 | static void | |
ca5c370d | 271 | linux_remove_process (struct process_info *process) |
5091eb23 | 272 | { |
cdbfd419 PP |
273 | struct process_info_private *priv = process->private; |
274 | ||
cdbfd419 PP |
275 | free (priv->arch_private); |
276 | free (priv); | |
5091eb23 DE |
277 | remove_process (process); |
278 | } | |
279 | ||
07d4f67e DE |
280 | /* Wrapper function for waitpid which handles EINTR, and emulates |
281 | __WALL for systems where that is not available. */ | |
282 | ||
283 | static int | |
284 | my_waitpid (int pid, int *status, int flags) | |
285 | { | |
286 | int ret, out_errno; | |
287 | ||
288 | if (debug_threads) | |
289 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
290 | ||
291 | if (flags & __WALL) | |
292 | { | |
293 | sigset_t block_mask, org_mask, wake_mask; | |
294 | int wnohang; | |
295 | ||
296 | wnohang = (flags & WNOHANG) != 0; | |
297 | flags &= ~(__WALL | __WCLONE); | |
298 | flags |= WNOHANG; | |
299 | ||
300 | /* Block all signals while here. This avoids knowing about | |
301 | LinuxThread's signals. */ | |
302 | sigfillset (&block_mask); | |
303 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
304 | ||
305 | /* ... except during the sigsuspend below. */ | |
306 | sigemptyset (&wake_mask); | |
307 | ||
308 | while (1) | |
309 | { | |
310 | /* Since all signals are blocked, there's no need to check | |
311 | for EINTR here. */ | |
312 | ret = waitpid (pid, status, flags); | |
313 | out_errno = errno; | |
314 | ||
315 | if (ret == -1 && out_errno != ECHILD) | |
316 | break; | |
317 | else if (ret > 0) | |
318 | break; | |
319 | ||
320 | if (flags & __WCLONE) | |
321 | { | |
322 | /* We've tried both flavors now. If WNOHANG is set, | |
323 | there's nothing else to do, just bail out. */ | |
324 | if (wnohang) | |
325 | break; | |
326 | ||
327 | if (debug_threads) | |
328 | fprintf (stderr, "blocking\n"); | |
329 | ||
330 | /* Block waiting for signals. */ | |
331 | sigsuspend (&wake_mask); | |
332 | } | |
333 | ||
334 | flags ^= __WCLONE; | |
335 | } | |
336 | ||
337 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
338 | } | |
339 | else | |
340 | { | |
341 | do | |
342 | ret = waitpid (pid, status, flags); | |
343 | while (ret == -1 && errno == EINTR); | |
344 | out_errno = errno; | |
345 | } | |
346 | ||
347 | if (debug_threads) | |
348 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
349 | pid, flags, status ? *status : -1, ret); | |
350 | ||
351 | errno = out_errno; | |
352 | return ret; | |
353 | } | |
354 | ||
bd99dc85 PA |
355 | /* Handle a GNU/Linux extended wait response. If we see a clone |
356 | event, we need to add the new LWP to our list (and not report the | |
357 | trap to higher layers). */ | |
0d62e5e8 | 358 | |
24a09b5f | 359 | static void |
54a0b537 | 360 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
361 | { |
362 | int event = wstat >> 16; | |
54a0b537 | 363 | struct lwp_info *new_lwp; |
24a09b5f DJ |
364 | |
365 | if (event == PTRACE_EVENT_CLONE) | |
366 | { | |
95954743 | 367 | ptid_t ptid; |
24a09b5f | 368 | unsigned long new_pid; |
836acd6d | 369 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 370 | |
bd99dc85 | 371 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
372 | |
373 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
374 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
375 | { | |
376 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
377 | hits the SIGSTOP, but we're already attached. */ | |
378 | ||
97438e3f | 379 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
380 | |
381 | if (ret == -1) | |
382 | perror_with_name ("waiting for new child"); | |
383 | else if (ret != new_pid) | |
384 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 385 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
386 | warning ("wait returned unexpected status 0x%x", status); |
387 | } | |
388 | ||
14ce3065 | 389 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); |
24a09b5f | 390 | |
95954743 PA |
391 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
392 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
393 | add_thread (ptid, new_lwp); | |
24a09b5f | 394 | |
e27d73f6 DE |
395 | /* Either we're going to immediately resume the new thread |
396 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
397 | thinks the thread is currently running, so set this first | |
398 | before calling linux_resume_one_lwp. */ | |
399 | new_lwp->stopped = 1; | |
400 | ||
da5898ce DJ |
401 | /* Normally we will get the pending SIGSTOP. But in some cases |
402 | we might get another signal delivered to the group first. | |
f21cc1a2 | 403 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
404 | if (WSTOPSIG (status) == SIGSTOP) |
405 | { | |
e27d73f6 DE |
406 | if (! stopping_threads) |
407 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); | |
da5898ce | 408 | } |
24a09b5f | 409 | else |
da5898ce | 410 | { |
54a0b537 | 411 | new_lwp->stop_expected = 1; |
da5898ce DJ |
412 | if (stopping_threads) |
413 | { | |
54a0b537 PA |
414 | new_lwp->status_pending_p = 1; |
415 | new_lwp->status_pending = status; | |
da5898ce DJ |
416 | } |
417 | else | |
418 | /* Pass the signal on. This is what GDB does - except | |
419 | shouldn't we really report it instead? */ | |
e27d73f6 | 420 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 421 | } |
24a09b5f DJ |
422 | |
423 | /* Always resume the current thread. If we are stopping | |
424 | threads, it will have a pending SIGSTOP; we may as well | |
425 | collect it now. */ | |
2acc282a | 426 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
427 | } |
428 | } | |
429 | ||
0d62e5e8 DJ |
430 | /* This function should only be called if the process got a SIGTRAP. |
431 | The SIGTRAP could mean several things. | |
432 | ||
433 | On i386, where decr_pc_after_break is non-zero: | |
434 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
435 | we will get only the one SIGTRAP (even if the instruction we | |
436 | stepped over was a breakpoint). The value of $eip will be the | |
437 | next instruction. | |
438 | If we continue the process using PTRACE_CONT, we will get a | |
439 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
440 | the instruction after the breakpoint (i.e. needs to be | |
441 | decremented). If we report the SIGTRAP to GDB, we must also | |
442 | report the undecremented PC. If we cancel the SIGTRAP, we | |
443 | must resume at the decremented PC. | |
444 | ||
445 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
446 | with hardware or kernel single-step: | |
447 | If we single-step over a breakpoint instruction, our PC will | |
448 | point at the following instruction. If we continue and hit a | |
449 | breakpoint instruction, our PC will point at the breakpoint | |
450 | instruction. */ | |
451 | ||
452 | static CORE_ADDR | |
453 | get_stop_pc (void) | |
454 | { | |
442ea881 PA |
455 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
456 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (regcache); | |
0d62e5e8 | 457 | |
2b009048 DJ |
458 | if (! get_thread_lwp (current_inferior)->stepping |
459 | && WSTOPSIG (get_thread_lwp (current_inferior)->last_status) == SIGTRAP) | |
47c0c975 DE |
460 | stop_pc -= the_low_target.decr_pc_after_break; |
461 | ||
462 | if (debug_threads) | |
463 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
464 | ||
465 | return stop_pc; | |
0d62e5e8 | 466 | } |
ce3a066d | 467 | |
0d62e5e8 | 468 | static void * |
95954743 | 469 | add_lwp (ptid_t ptid) |
611cb4a5 | 470 | { |
54a0b537 | 471 | struct lwp_info *lwp; |
0d62e5e8 | 472 | |
54a0b537 PA |
473 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
474 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 475 | |
95954743 | 476 | lwp->head.id = ptid; |
0d62e5e8 | 477 | |
aa5ca48f DE |
478 | if (the_low_target.new_thread != NULL) |
479 | lwp->arch_private = the_low_target.new_thread (); | |
480 | ||
54a0b537 | 481 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 482 | |
54a0b537 | 483 | return lwp; |
0d62e5e8 | 484 | } |
611cb4a5 | 485 | |
da6d8c04 DJ |
486 | /* Start an inferior process and returns its pid. |
487 | ALLARGS is a vector of program-name and args. */ | |
488 | ||
ce3a066d DJ |
489 | static int |
490 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 491 | { |
a6dbe5df | 492 | struct lwp_info *new_lwp; |
da6d8c04 | 493 | int pid; |
95954743 | 494 | ptid_t ptid; |
da6d8c04 | 495 | |
42c81e2a | 496 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
497 | pid = vfork (); |
498 | #else | |
da6d8c04 | 499 | pid = fork (); |
52fb6437 | 500 | #endif |
da6d8c04 DJ |
501 | if (pid < 0) |
502 | perror_with_name ("fork"); | |
503 | ||
504 | if (pid == 0) | |
505 | { | |
506 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
507 | ||
60c3d7b0 | 508 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 509 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 510 | #endif |
0d62e5e8 | 511 | |
a9fa9f7d DJ |
512 | setpgid (0, 0); |
513 | ||
2b876972 DJ |
514 | execv (program, allargs); |
515 | if (errno == ENOENT) | |
516 | execvp (program, allargs); | |
da6d8c04 DJ |
517 | |
518 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 519 | strerror (errno)); |
da6d8c04 DJ |
520 | fflush (stderr); |
521 | _exit (0177); | |
522 | } | |
523 | ||
95954743 PA |
524 | linux_add_process (pid, 0); |
525 | ||
526 | ptid = ptid_build (pid, pid, 0); | |
527 | new_lwp = add_lwp (ptid); | |
528 | add_thread (ptid, new_lwp); | |
a6dbe5df | 529 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 530 | |
a9fa9f7d | 531 | return pid; |
da6d8c04 DJ |
532 | } |
533 | ||
534 | /* Attach to an inferior process. */ | |
535 | ||
95954743 PA |
536 | static void |
537 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 538 | { |
95954743 | 539 | ptid_t ptid; |
54a0b537 | 540 | struct lwp_info *new_lwp; |
611cb4a5 | 541 | |
95954743 | 542 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 543 | { |
95954743 | 544 | if (!initial) |
2d717e4f DJ |
545 | { |
546 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 547 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
548 | strerror (errno), errno); |
549 | fflush (stderr); | |
550 | return; | |
551 | } | |
552 | else | |
553 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 554 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 555 | strerror (errno), errno); |
da6d8c04 DJ |
556 | } |
557 | ||
95954743 PA |
558 | if (initial) |
559 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
560 | ptid = ptid_build (lwpid, lwpid, 0); | |
561 | else | |
562 | { | |
563 | /* Note that extracting the pid from the current inferior is | |
564 | safe, since we're always called in the context of the same | |
565 | process as this new thread. */ | |
566 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
567 | ptid = ptid_build (pid, lwpid, 0); | |
568 | } | |
24a09b5f | 569 | |
95954743 PA |
570 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
571 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 572 | |
a6dbe5df PA |
573 | /* We need to wait for SIGSTOP before being able to make the next |
574 | ptrace call on this LWP. */ | |
575 | new_lwp->must_set_ptrace_flags = 1; | |
576 | ||
0d62e5e8 | 577 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
578 | brings it to a halt. |
579 | ||
580 | There are several cases to consider here: | |
581 | ||
582 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 PA |
583 | of a new thread that is being created. |
584 | In this case we should ignore that SIGSTOP and resume the process. | |
585 | This is handled below by setting stop_expected = 1. | |
0e21c1ec DE |
586 | |
587 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
588 | to it via attach_inferior. |
589 | In this case we want the process thread to stop. | |
590 | This is handled by having linux_attach clear stop_expected after | |
591 | we return. | |
592 | ??? If the process already has several threads we leave the other | |
593 | threads running. | |
0e21c1ec DE |
594 | |
595 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
596 | existing threads. |
597 | In this case we want the thread to stop. | |
598 | FIXME: This case is currently not properly handled. | |
599 | We should wait for the SIGSTOP but don't. Things work apparently | |
600 | because enough time passes between when we ptrace (ATTACH) and when | |
601 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
602 | |
603 | On the other hand, if we are currently trying to stop all threads, we | |
604 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 605 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
606 | end of the list, and so the new thread has not yet reached |
607 | wait_for_sigstop (but will). */ | |
0d62e5e8 | 608 | if (! stopping_threads) |
54a0b537 | 609 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
610 | } |
611 | ||
95954743 PA |
612 | void |
613 | linux_attach_lwp (unsigned long lwpid) | |
614 | { | |
615 | linux_attach_lwp_1 (lwpid, 0); | |
616 | } | |
617 | ||
0d62e5e8 | 618 | int |
a1928bad | 619 | linux_attach (unsigned long pid) |
0d62e5e8 | 620 | { |
54a0b537 | 621 | struct lwp_info *lwp; |
0d62e5e8 | 622 | |
95954743 PA |
623 | linux_attach_lwp_1 (pid, 1); |
624 | ||
625 | linux_add_process (pid, 1); | |
0d62e5e8 | 626 | |
bd99dc85 PA |
627 | if (!non_stop) |
628 | { | |
629 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
630 | process. It will be collected by wait shortly. */ | |
95954743 PA |
631 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
632 | ptid_build (pid, pid, 0)); | |
bd99dc85 PA |
633 | lwp->stop_expected = 0; |
634 | } | |
0d62e5e8 | 635 | |
95954743 PA |
636 | return 0; |
637 | } | |
638 | ||
639 | struct counter | |
640 | { | |
641 | int pid; | |
642 | int count; | |
643 | }; | |
644 | ||
645 | static int | |
646 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
647 | { | |
648 | struct counter *counter = args; | |
649 | ||
650 | if (ptid_get_pid (entry->id) == counter->pid) | |
651 | { | |
652 | if (++counter->count > 1) | |
653 | return 1; | |
654 | } | |
d61ddec4 | 655 | |
da6d8c04 DJ |
656 | return 0; |
657 | } | |
658 | ||
95954743 PA |
659 | static int |
660 | last_thread_of_process_p (struct thread_info *thread) | |
661 | { | |
662 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
663 | int pid = ptid_get_pid (ptid); | |
664 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 665 | |
95954743 PA |
666 | return (find_inferior (&all_threads, |
667 | second_thread_of_pid_p, &counter) == NULL); | |
668 | } | |
669 | ||
670 | /* Kill the inferior lwp. */ | |
671 | ||
672 | static int | |
673 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 674 | { |
0d62e5e8 | 675 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 676 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 677 | int wstat; |
95954743 PA |
678 | int pid = * (int *) args; |
679 | ||
680 | if (ptid_get_pid (entry->id) != pid) | |
681 | return 0; | |
0d62e5e8 | 682 | |
fd500816 DJ |
683 | /* We avoid killing the first thread here, because of a Linux kernel (at |
684 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
685 | the children get a chance to be reaped, it will remain a zombie | |
686 | forever. */ | |
95954743 | 687 | |
12b42a12 | 688 | if (lwpid_of (lwp) == pid) |
95954743 PA |
689 | { |
690 | if (debug_threads) | |
691 | fprintf (stderr, "lkop: is last of process %s\n", | |
692 | target_pid_to_str (entry->id)); | |
693 | return 0; | |
694 | } | |
fd500816 | 695 | |
bd99dc85 PA |
696 | /* If we're killing a running inferior, make sure it is stopped |
697 | first, as PTRACE_KILL will not work otherwise. */ | |
698 | if (!lwp->stopped) | |
699 | send_sigstop (&lwp->head); | |
700 | ||
0d62e5e8 DJ |
701 | do |
702 | { | |
bd99dc85 | 703 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
704 | |
705 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 706 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 707 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
708 | |
709 | return 0; | |
da6d8c04 DJ |
710 | } |
711 | ||
95954743 PA |
712 | static int |
713 | linux_kill (int pid) | |
0d62e5e8 | 714 | { |
95954743 | 715 | struct process_info *process; |
54a0b537 | 716 | struct lwp_info *lwp; |
95954743 | 717 | struct thread_info *thread; |
fd500816 | 718 | int wstat; |
95954743 | 719 | int lwpid; |
fd500816 | 720 | |
95954743 PA |
721 | process = find_process_pid (pid); |
722 | if (process == NULL) | |
723 | return -1; | |
9d606399 | 724 | |
95954743 | 725 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 726 | |
54a0b537 | 727 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 728 | thread in the list, so do so now. */ |
95954743 PA |
729 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
730 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
731 | |
732 | if (debug_threads) | |
95954743 PA |
733 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
734 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
735 | |
736 | /* If we're killing a running inferior, make sure it is stopped | |
737 | first, as PTRACE_KILL will not work otherwise. */ | |
738 | if (!lwp->stopped) | |
739 | send_sigstop (&lwp->head); | |
740 | ||
fd500816 DJ |
741 | do |
742 | { | |
bd99dc85 | 743 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
744 | |
745 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
746 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
747 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 748 | |
ca5c370d PA |
749 | #ifdef USE_THREAD_DB |
750 | thread_db_free (process, 0); | |
751 | #endif | |
bd99dc85 | 752 | delete_lwp (lwp); |
ca5c370d | 753 | linux_remove_process (process); |
95954743 | 754 | return 0; |
0d62e5e8 DJ |
755 | } |
756 | ||
95954743 PA |
757 | static int |
758 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
759 | { |
760 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 761 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
762 | int pid = * (int *) args; |
763 | ||
764 | if (ptid_get_pid (entry->id) != pid) | |
765 | return 0; | |
6ad8ae5c | 766 | |
bd99dc85 PA |
767 | /* If we're detaching from a running inferior, make sure it is |
768 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
769 | if (!lwp->stopped) | |
770 | { | |
95954743 | 771 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
772 | |
773 | stopping_threads = 1; | |
774 | send_sigstop (&lwp->head); | |
775 | ||
776 | /* If this detects a new thread through a clone event, the new | |
777 | thread is appended to the end of the lwp list, so we'll | |
778 | eventually detach from it. */ | |
779 | wait_for_sigstop (&lwp->head); | |
780 | stopping_threads = 0; | |
781 | ||
782 | /* If LWP exits while we're trying to stop it, there's nothing | |
783 | left to do. */ | |
95954743 | 784 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 785 | if (lwp == NULL) |
95954743 | 786 | return 0; |
bd99dc85 PA |
787 | } |
788 | ||
ae13219e DJ |
789 | /* Make sure the process isn't stopped at a breakpoint that's |
790 | no longer there. */ | |
54a0b537 | 791 | check_removed_breakpoint (lwp); |
ae13219e DJ |
792 | |
793 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
794 | sure we take care of that now. This isn't absolutely guaranteed | |
795 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 796 | if (lwp->stop_expected) |
ae13219e | 797 | { |
bd99dc85 | 798 | int wstat; |
ae13219e | 799 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
800 | lwp->stop_expected = 0; |
801 | if (lwp->stopped) | |
2acc282a | 802 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 803 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
804 | } |
805 | ||
806 | /* Flush any pending changes to the process's registers. */ | |
807 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 808 | get_lwp_thread (lwp)); |
ae13219e DJ |
809 | |
810 | /* Finally, let it resume. */ | |
bd99dc85 PA |
811 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
812 | ||
813 | delete_lwp (lwp); | |
95954743 | 814 | return 0; |
6ad8ae5c DJ |
815 | } |
816 | ||
dd6953e1 | 817 | static int |
95954743 | 818 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 819 | { |
95954743 PA |
820 | int *pid_p = args; |
821 | ||
822 | if (ptid_get_pid (entry->id) == *pid_p) | |
823 | return 1; | |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
828 | static int | |
829 | linux_detach (int pid) | |
830 | { | |
831 | struct process_info *process; | |
832 | ||
833 | process = find_process_pid (pid); | |
834 | if (process == NULL) | |
835 | return -1; | |
836 | ||
ca5c370d PA |
837 | #ifdef USE_THREAD_DB |
838 | thread_db_free (process, 1); | |
839 | #endif | |
840 | ||
95954743 PA |
841 | current_inferior = |
842 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
843 | ||
ae13219e | 844 | delete_all_breakpoints (); |
95954743 | 845 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
ca5c370d | 846 | linux_remove_process (process); |
dd6953e1 | 847 | return 0; |
6ad8ae5c DJ |
848 | } |
849 | ||
444d6139 | 850 | static void |
95954743 | 851 | linux_join (int pid) |
444d6139 | 852 | { |
444d6139 | 853 | int status, ret; |
95954743 | 854 | struct process_info *process; |
bd99dc85 | 855 | |
95954743 PA |
856 | process = find_process_pid (pid); |
857 | if (process == NULL) | |
858 | return; | |
444d6139 PA |
859 | |
860 | do { | |
95954743 | 861 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
862 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
863 | break; | |
864 | } while (ret != -1 || errno != ECHILD); | |
865 | } | |
866 | ||
6ad8ae5c | 867 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 868 | static int |
95954743 | 869 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 870 | { |
95954743 PA |
871 | struct lwp_info *lwp = find_lwp_pid (ptid); |
872 | ||
873 | /* We assume we always know if a thread exits. If a whole process | |
874 | exited but we still haven't been able to report it to GDB, we'll | |
875 | hold on to the last lwp of the dead process. */ | |
876 | if (lwp != NULL) | |
877 | return !lwp->dead; | |
0d62e5e8 DJ |
878 | else |
879 | return 0; | |
880 | } | |
881 | ||
882 | /* Return nonzero if this process stopped at a breakpoint which | |
883 | no longer appears to be inserted. Also adjust the PC | |
884 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 885 | static int |
54a0b537 | 886 | check_removed_breakpoint (struct lwp_info *event_child) |
da6d8c04 | 887 | { |
0d62e5e8 DJ |
888 | CORE_ADDR stop_pc; |
889 | struct thread_info *saved_inferior; | |
442ea881 | 890 | struct regcache *regcache; |
0d62e5e8 DJ |
891 | |
892 | if (event_child->pending_is_breakpoint == 0) | |
893 | return 0; | |
894 | ||
895 | if (debug_threads) | |
54a0b537 | 896 | fprintf (stderr, "Checking for breakpoint in lwp %ld.\n", |
bd99dc85 | 897 | lwpid_of (event_child)); |
0d62e5e8 DJ |
898 | |
899 | saved_inferior = current_inferior; | |
54a0b537 | 900 | current_inferior = get_lwp_thread (event_child); |
442ea881 | 901 | regcache = get_thread_regcache (current_inferior, 1); |
0d62e5e8 DJ |
902 | stop_pc = get_stop_pc (); |
903 | ||
904 | /* If the PC has changed since we stopped, then we shouldn't do | |
905 | anything. This happens if, for instance, GDB handled the | |
906 | decr_pc_after_break subtraction itself. */ | |
907 | if (stop_pc != event_child->pending_stop_pc) | |
908 | { | |
909 | if (debug_threads) | |
ae13219e DJ |
910 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
911 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
912 | |
913 | event_child->pending_is_breakpoint = 0; | |
914 | current_inferior = saved_inferior; | |
915 | return 0; | |
916 | } | |
917 | ||
918 | /* If the breakpoint is still there, we will report hitting it. */ | |
919 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
920 | { | |
921 | if (debug_threads) | |
922 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
923 | current_inferior = saved_inferior; | |
924 | return 0; | |
925 | } | |
926 | ||
927 | if (debug_threads) | |
928 | fprintf (stderr, "Removed breakpoint.\n"); | |
929 | ||
930 | /* For decr_pc_after_break targets, here is where we perform the | |
931 | decrement. We go immediately from this function to resuming, | |
932 | and can not safely call get_stop_pc () again. */ | |
933 | if (the_low_target.set_pc != NULL) | |
47c0c975 DE |
934 | { |
935 | if (debug_threads) | |
936 | fprintf (stderr, "Set pc to 0x%lx\n", (long) stop_pc); | |
442ea881 | 937 | (*the_low_target.set_pc) (regcache, stop_pc); |
47c0c975 | 938 | } |
0d62e5e8 DJ |
939 | |
940 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 941 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
942 | event_child->status_pending_p = 0; |
943 | event_child->status_pending = 0; | |
944 | ||
945 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
946 | return 1; |
947 | } | |
948 | ||
54a0b537 PA |
949 | /* Return 1 if this lwp has an interesting status pending. This |
950 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 951 | static int |
95954743 | 952 | status_pending_p (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 953 | { |
54a0b537 | 954 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 PA |
955 | ptid_t ptid = * (ptid_t *) arg; |
956 | ||
957 | /* Check if we're only interested in events from a specific process | |
958 | or its lwps. */ | |
959 | if (!ptid_equal (minus_one_ptid, ptid) | |
960 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
961 | return 0; | |
0d62e5e8 | 962 | |
bd99dc85 | 963 | if (lwp->status_pending_p && !lwp->suspended) |
54a0b537 | 964 | if (check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
965 | { |
966 | /* This thread was stopped at a breakpoint, and the breakpoint | |
967 | is now gone. We were told to continue (or step...) all threads, | |
968 | so GDB isn't trying to single-step past this breakpoint. | |
969 | So instead of reporting the old SIGTRAP, pretend we got to | |
970 | the breakpoint just after it was removed instead of just | |
971 | before; resume the process. */ | |
2acc282a | 972 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
0d62e5e8 DJ |
973 | return 0; |
974 | } | |
975 | ||
bd99dc85 | 976 | return (lwp->status_pending_p && !lwp->suspended); |
0d62e5e8 DJ |
977 | } |
978 | ||
95954743 PA |
979 | static int |
980 | same_lwp (struct inferior_list_entry *entry, void *data) | |
981 | { | |
982 | ptid_t ptid = *(ptid_t *) data; | |
983 | int lwp; | |
984 | ||
985 | if (ptid_get_lwp (ptid) != 0) | |
986 | lwp = ptid_get_lwp (ptid); | |
987 | else | |
988 | lwp = ptid_get_pid (ptid); | |
989 | ||
990 | if (ptid_get_lwp (entry->id) == lwp) | |
991 | return 1; | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
996 | struct lwp_info * | |
997 | find_lwp_pid (ptid_t ptid) | |
998 | { | |
999 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1000 | } | |
1001 | ||
bd99dc85 | 1002 | static struct lwp_info * |
95954743 | 1003 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1004 | { |
0d62e5e8 | 1005 | int ret; |
95954743 | 1006 | int to_wait_for = -1; |
bd99dc85 | 1007 | struct lwp_info *child = NULL; |
0d62e5e8 | 1008 | |
bd99dc85 | 1009 | if (debug_threads) |
95954743 PA |
1010 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1011 | ||
1012 | if (ptid_equal (ptid, minus_one_ptid)) | |
1013 | to_wait_for = -1; /* any child */ | |
1014 | else | |
1015 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1016 | |
bd99dc85 | 1017 | options |= __WALL; |
0d62e5e8 | 1018 | |
bd99dc85 | 1019 | retry: |
0d62e5e8 | 1020 | |
bd99dc85 PA |
1021 | ret = my_waitpid (to_wait_for, wstatp, options); |
1022 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1023 | return NULL; | |
1024 | else if (ret == -1) | |
1025 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1026 | |
1027 | if (debug_threads | |
1028 | && (!WIFSTOPPED (*wstatp) | |
1029 | || (WSTOPSIG (*wstatp) != 32 | |
1030 | && WSTOPSIG (*wstatp) != 33))) | |
1031 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1032 | ||
95954743 | 1033 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1034 | |
24a09b5f DJ |
1035 | /* If we didn't find a process, one of two things presumably happened: |
1036 | - A process we started and then detached from has exited. Ignore it. | |
1037 | - A process we are controlling has forked and the new child's stop | |
1038 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1039 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1040 | { |
1041 | add_pid_to_list (&stopped_pids, ret); | |
1042 | goto retry; | |
1043 | } | |
bd99dc85 | 1044 | else if (child == NULL) |
24a09b5f DJ |
1045 | goto retry; |
1046 | ||
bd99dc85 PA |
1047 | child->stopped = 1; |
1048 | child->pending_is_breakpoint = 0; | |
0d62e5e8 | 1049 | |
bd99dc85 | 1050 | child->last_status = *wstatp; |
32ca6d61 | 1051 | |
d61ddec4 UW |
1052 | /* Architecture-specific setup after inferior is running. |
1053 | This needs to happen after we have attached to the inferior | |
1054 | and it is stopped for the first time, but before we access | |
1055 | any inferior registers. */ | |
1056 | if (new_inferior) | |
1057 | { | |
1058 | the_low_target.arch_setup (); | |
52fa2412 UW |
1059 | #ifdef HAVE_LINUX_REGSETS |
1060 | memset (disabled_regsets, 0, num_regsets); | |
1061 | #endif | |
d61ddec4 UW |
1062 | new_inferior = 0; |
1063 | } | |
1064 | ||
0d62e5e8 | 1065 | if (debug_threads |
47c0c975 DE |
1066 | && WIFSTOPPED (*wstatp) |
1067 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1068 | { |
896c7fbb | 1069 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1070 | struct regcache *regcache; |
47c0c975 DE |
1071 | CORE_ADDR pc; |
1072 | ||
0d62e5e8 | 1073 | current_inferior = (struct thread_info *) |
95954743 | 1074 | find_inferior_id (&all_threads, child->head.id); |
bce522a2 | 1075 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1076 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1077 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1078 | current_inferior = saved_inferior; |
0d62e5e8 | 1079 | } |
bd99dc85 PA |
1080 | |
1081 | return child; | |
0d62e5e8 | 1082 | } |
611cb4a5 | 1083 | |
bd99dc85 PA |
1084 | /* Wait for an event from child PID. If PID is -1, wait for any |
1085 | child. Store the stop status through the status pointer WSTAT. | |
1086 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1087 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1088 | the stopped child otherwise. */ | |
1089 | ||
0d62e5e8 | 1090 | static int |
95954743 | 1091 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 DJ |
1092 | { |
1093 | CORE_ADDR stop_pc; | |
bd99dc85 | 1094 | struct lwp_info *event_child = NULL; |
b65d95c5 | 1095 | int bp_status; |
bd99dc85 | 1096 | struct lwp_info *requested_child = NULL; |
0d62e5e8 | 1097 | |
95954743 | 1098 | /* Check for a lwp with a pending status. */ |
0d62e5e8 DJ |
1099 | /* It is possible that the user changed the pending task's registers since |
1100 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 1101 | (in check_removed_breakpoint); signals should be reported anyway. */ |
bd99dc85 | 1102 | |
95954743 PA |
1103 | if (ptid_equal (ptid, minus_one_ptid) |
1104 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1105 | { |
54a0b537 | 1106 | event_child = (struct lwp_info *) |
95954743 | 1107 | find_inferior (&all_lwps, status_pending_p, &ptid); |
0d62e5e8 | 1108 | if (debug_threads && event_child) |
bd99dc85 | 1109 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1110 | } |
1111 | else | |
1112 | { | |
95954743 | 1113 | requested_child = find_lwp_pid (ptid); |
bd99dc85 PA |
1114 | if (requested_child->status_pending_p |
1115 | && !check_removed_breakpoint (requested_child)) | |
1116 | event_child = requested_child; | |
0d62e5e8 | 1117 | } |
611cb4a5 | 1118 | |
0d62e5e8 DJ |
1119 | if (event_child != NULL) |
1120 | { | |
bd99dc85 PA |
1121 | if (debug_threads) |
1122 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1123 | lwpid_of (event_child), event_child->status_pending); | |
1124 | *wstat = event_child->status_pending; | |
1125 | event_child->status_pending_p = 0; | |
1126 | event_child->status_pending = 0; | |
1127 | current_inferior = get_lwp_thread (event_child); | |
1128 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1129 | } |
1130 | ||
1131 | /* We only enter this loop if no process has a pending wait status. Thus | |
1132 | any action taken in response to a wait status inside this loop is | |
1133 | responding as soon as we detect the status, not after any pending | |
1134 | events. */ | |
1135 | while (1) | |
1136 | { | |
95954743 | 1137 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1138 | |
bd99dc85 PA |
1139 | if ((options & WNOHANG) && event_child == NULL) |
1140 | return 0; | |
0d62e5e8 DJ |
1141 | |
1142 | if (event_child == NULL) | |
1143 | error ("event from unknown child"); | |
611cb4a5 | 1144 | |
bd99dc85 | 1145 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1146 | |
89be2091 | 1147 | /* Check for thread exit. */ |
bd99dc85 | 1148 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1149 | { |
89be2091 | 1150 | if (debug_threads) |
95954743 | 1151 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1152 | |
1153 | /* If the last thread is exiting, just return. */ | |
95954743 | 1154 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1155 | { |
1156 | if (debug_threads) | |
95954743 PA |
1157 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1158 | lwpid_of (event_child)); | |
bd99dc85 PA |
1159 | return lwpid_of (event_child); |
1160 | } | |
89be2091 | 1161 | |
bd99dc85 | 1162 | delete_lwp (event_child); |
89be2091 | 1163 | |
bd99dc85 PA |
1164 | if (!non_stop) |
1165 | { | |
1166 | current_inferior = (struct thread_info *) all_threads.head; | |
1167 | if (debug_threads) | |
1168 | fprintf (stderr, "Current inferior is now %ld\n", | |
1169 | lwpid_of (get_thread_lwp (current_inferior))); | |
1170 | } | |
1171 | else | |
1172 | { | |
1173 | current_inferior = NULL; | |
1174 | if (debug_threads) | |
1175 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1176 | } | |
89be2091 DJ |
1177 | |
1178 | /* If we were waiting for this particular child to do something... | |
1179 | well, it did something. */ | |
bd99dc85 | 1180 | if (requested_child != NULL) |
95954743 | 1181 | return lwpid_of (event_child); |
89be2091 DJ |
1182 | |
1183 | /* Wait for a more interesting event. */ | |
1184 | continue; | |
1185 | } | |
1186 | ||
a6dbe5df PA |
1187 | if (event_child->must_set_ptrace_flags) |
1188 | { | |
1189 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
14ce3065 | 1190 | 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); |
a6dbe5df PA |
1191 | event_child->must_set_ptrace_flags = 0; |
1192 | } | |
1193 | ||
bd99dc85 PA |
1194 | if (WIFSTOPPED (*wstat) |
1195 | && WSTOPSIG (*wstat) == SIGSTOP | |
89be2091 DJ |
1196 | && event_child->stop_expected) |
1197 | { | |
1198 | if (debug_threads) | |
1199 | fprintf (stderr, "Expected stop.\n"); | |
1200 | event_child->stop_expected = 0; | |
2acc282a | 1201 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
89be2091 DJ |
1202 | continue; |
1203 | } | |
1204 | ||
bd99dc85 PA |
1205 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1206 | && *wstat >> 16 != 0) | |
24a09b5f | 1207 | { |
bd99dc85 | 1208 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1209 | continue; |
1210 | } | |
1211 | ||
89be2091 DJ |
1212 | /* If GDB is not interested in this signal, don't stop other |
1213 | threads, and don't report it to GDB. Just resume the | |
1214 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1215 | signals as well as any that GDB specifically requested we |
1216 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1217 | and do not ignore signals when stepping - they may require | |
1218 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1219 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1220 | thread library? */ | |
bd99dc85 | 1221 | if (WIFSTOPPED (*wstat) |
69f223ed | 1222 | && !event_child->stepping |
24a09b5f | 1223 | && ( |
60c3d7b0 | 1224 | #if defined (USE_THREAD_DB) && defined (__SIGRTMIN) |
cdbfd419 | 1225 | (current_process ()->private->thread_db != NULL |
bd99dc85 PA |
1226 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1227 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1228 | || |
1229 | #endif | |
bd99dc85 PA |
1230 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
1231 | && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
1232 | { |
1233 | siginfo_t info, *info_p; | |
1234 | ||
1235 | if (debug_threads) | |
24a09b5f | 1236 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1237 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1238 | |
bd99dc85 | 1239 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1240 | info_p = &info; |
1241 | else | |
1242 | info_p = NULL; | |
2acc282a | 1243 | linux_resume_one_lwp (event_child, |
54a0b537 | 1244 | event_child->stepping, |
bd99dc85 | 1245 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1246 | continue; |
0d62e5e8 | 1247 | } |
611cb4a5 | 1248 | |
2b009048 DJ |
1249 | /* If this event was not handled above, and is not a SIGTRAP, |
1250 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
1251 | a breakpoint is inserted at the current PC. */ | |
1252 | if (!WIFSTOPPED (*wstat) | |
1253 | || (WSTOPSIG (*wstat) != SIGTRAP && WSTOPSIG (*wstat) != SIGILL | |
1254 | && WSTOPSIG (*wstat) != SIGSEGV)) | |
bd99dc85 | 1255 | return lwpid_of (event_child); |
611cb4a5 | 1256 | |
0d62e5e8 | 1257 | /* If this target does not support breakpoints, we simply report the |
2b009048 | 1258 | signal; it's of no concern to us. */ |
0d62e5e8 | 1259 | if (the_low_target.get_pc == NULL) |
bd99dc85 | 1260 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1261 | |
1262 | stop_pc = get_stop_pc (); | |
1263 | ||
2b009048 DJ |
1264 | /* Only handle SIGILL or SIGSEGV if we've hit a recognized |
1265 | breakpoint. */ | |
1266 | if (WSTOPSIG (*wstat) != SIGTRAP | |
1267 | && (event_child->stepping | |
1268 | || ! (*the_low_target.breakpoint_at) (stop_pc))) | |
1269 | return lwpid_of (event_child); | |
1270 | ||
0d62e5e8 DJ |
1271 | /* bp_reinsert will only be set if we were single-stepping. |
1272 | Notice that we will resume the process after hitting | |
1273 | a gdbserver breakpoint; single-stepping to/over one | |
1274 | is not supported (yet). */ | |
1275 | if (event_child->bp_reinsert != 0) | |
1276 | { | |
1277 | if (debug_threads) | |
1278 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
1279 | reinsert_breakpoint (event_child->bp_reinsert); | |
1280 | event_child->bp_reinsert = 0; | |
1281 | ||
1282 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
2acc282a | 1283 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
0d62e5e8 DJ |
1284 | continue; |
1285 | } | |
1286 | ||
b65d95c5 | 1287 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 1288 | |
b65d95c5 | 1289 | if (bp_status != 0) |
0d62e5e8 | 1290 | { |
b65d95c5 DJ |
1291 | if (debug_threads) |
1292 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1293 | ||
0d62e5e8 | 1294 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 1295 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
1296 | adjustment for us at the appropriate time. */ |
1297 | event_child->pending_is_breakpoint = 1; | |
1298 | event_child->pending_stop_pc = stop_pc; | |
1299 | ||
b65d95c5 | 1300 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
1301 | loop instead of simply replacing the breakpoint right away, |
1302 | in order to not lose signals sent to the thread that hit the | |
1303 | breakpoint. Unfortunately this increases the window where another | |
1304 | thread could sneak past the removed breakpoint. For the current | |
1305 | use of server-side breakpoints (thread creation) this is | |
1306 | acceptable; but it needs to be considered before this breakpoint | |
1307 | mechanism can be used in more general ways. For some breakpoints | |
1308 | it may be necessary to stop all other threads, but that should | |
1309 | be avoided where possible. | |
1310 | ||
1311 | If breakpoint_reinsert_addr is NULL, that means that we can | |
1312 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
1313 | mark it for reinsertion, and single-step. | |
1314 | ||
1315 | Otherwise, call the target function to figure out where we need | |
1316 | our temporary breakpoint, create it, and continue executing this | |
1317 | process. */ | |
bd99dc85 PA |
1318 | |
1319 | /* NOTE: we're lifting breakpoints in non-stop mode. This | |
1320 | is currently only used for thread event breakpoints, so | |
1321 | it isn't that bad as long as we have PTRACE_EVENT_CLONE | |
1322 | events. */ | |
b65d95c5 DJ |
1323 | if (bp_status == 2) |
1324 | /* No need to reinsert. */ | |
2acc282a | 1325 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
b65d95c5 | 1326 | else if (the_low_target.breakpoint_reinsert_addr == NULL) |
0d62e5e8 DJ |
1327 | { |
1328 | event_child->bp_reinsert = stop_pc; | |
1329 | uninsert_breakpoint (stop_pc); | |
2acc282a | 1330 | linux_resume_one_lwp (event_child, 1, 0, NULL); |
0d62e5e8 DJ |
1331 | } |
1332 | else | |
1333 | { | |
1334 | reinsert_breakpoint_by_bp | |
1335 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
2acc282a | 1336 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
611cb4a5 | 1337 | } |
0d62e5e8 DJ |
1338 | |
1339 | continue; | |
1340 | } | |
1341 | ||
b65d95c5 DJ |
1342 | if (debug_threads) |
1343 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
1344 | ||
0d62e5e8 | 1345 | /* If we were single-stepping, we definitely want to report the |
c35fafde PA |
1346 | SIGTRAP. Although the single-step operation has completed, |
1347 | do not clear clear the stepping flag yet; we need to check it | |
1348 | in wait_for_sigstop. */ | |
0d62e5e8 | 1349 | if (event_child->stepping) |
bd99dc85 | 1350 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1351 | |
1352 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
1353 | Check if it is a breakpoint, and if so mark the process information | |
1354 | accordingly. This will handle both the necessary fiddling with the | |
1355 | PC on decr_pc_after_break targets and suppressing extra threads | |
1356 | hitting a breakpoint if two hit it at once and then GDB removes it | |
1357 | after the first is reported. Arguably it would be better to report | |
1358 | multiple threads hitting breakpoints simultaneously, but the current | |
1359 | remote protocol does not allow this. */ | |
1360 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
1361 | { | |
1362 | event_child->pending_is_breakpoint = 1; | |
1363 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
1364 | } |
1365 | ||
bd99dc85 | 1366 | return lwpid_of (event_child); |
611cb4a5 | 1367 | } |
0d62e5e8 | 1368 | |
611cb4a5 DJ |
1369 | /* NOTREACHED */ |
1370 | return 0; | |
1371 | } | |
1372 | ||
95954743 PA |
1373 | static int |
1374 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1375 | { | |
1376 | ptid_t wait_ptid; | |
1377 | ||
1378 | if (ptid_is_pid (ptid)) | |
1379 | { | |
1380 | /* A request to wait for a specific tgid. This is not possible | |
1381 | with waitpid, so instead, we wait for any child, and leave | |
1382 | children we're not interested in right now with a pending | |
1383 | status to report later. */ | |
1384 | wait_ptid = minus_one_ptid; | |
1385 | } | |
1386 | else | |
1387 | wait_ptid = ptid; | |
1388 | ||
1389 | while (1) | |
1390 | { | |
1391 | int event_pid; | |
1392 | ||
1393 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1394 | ||
1395 | if (event_pid > 0 | |
1396 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1397 | { | |
1398 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1399 | ||
1400 | if (! WIFSTOPPED (*wstat)) | |
1401 | mark_lwp_dead (event_child, *wstat); | |
1402 | else | |
1403 | { | |
1404 | event_child->status_pending_p = 1; | |
1405 | event_child->status_pending = *wstat; | |
1406 | } | |
1407 | } | |
1408 | else | |
1409 | return event_pid; | |
1410 | } | |
1411 | } | |
1412 | ||
0d62e5e8 | 1413 | /* Wait for process, returns status. */ |
da6d8c04 | 1414 | |
95954743 PA |
1415 | static ptid_t |
1416 | linux_wait_1 (ptid_t ptid, | |
1417 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1418 | { |
e5f1222d | 1419 | int w; |
bd99dc85 PA |
1420 | struct thread_info *thread = NULL; |
1421 | struct lwp_info *lwp = NULL; | |
1422 | int options; | |
bd99dc85 PA |
1423 | int pid; |
1424 | ||
1425 | /* Translate generic target options into linux options. */ | |
1426 | options = __WALL; | |
1427 | if (target_options & TARGET_WNOHANG) | |
1428 | options |= WNOHANG; | |
0d62e5e8 DJ |
1429 | |
1430 | retry: | |
bd99dc85 PA |
1431 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1432 | ||
0d62e5e8 DJ |
1433 | /* If we were only supposed to resume one thread, only wait for |
1434 | that thread - if it's still alive. If it died, however - which | |
1435 | can happen if we're coming from the thread death case below - | |
1436 | then we need to make sure we restart the other threads. We could | |
1437 | pick a thread at random or restart all; restarting all is less | |
1438 | arbitrary. */ | |
95954743 PA |
1439 | if (!non_stop |
1440 | && !ptid_equal (cont_thread, null_ptid) | |
1441 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1442 | { |
bd99dc85 PA |
1443 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1444 | cont_thread); | |
0d62e5e8 DJ |
1445 | |
1446 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1447 | if (thread == NULL) |
64386c31 DJ |
1448 | { |
1449 | struct thread_resume resume_info; | |
95954743 | 1450 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1451 | resume_info.kind = resume_continue; |
1452 | resume_info.sig = 0; | |
2bd7c093 | 1453 | linux_resume (&resume_info, 1); |
64386c31 | 1454 | } |
bd99dc85 | 1455 | else |
95954743 | 1456 | ptid = cont_thread; |
0d62e5e8 | 1457 | } |
da6d8c04 | 1458 | |
95954743 | 1459 | pid = linux_wait_for_event (ptid, &w, options); |
bd99dc85 | 1460 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1461 | return null_ptid; |
bd99dc85 PA |
1462 | |
1463 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1464 | |
0d62e5e8 DJ |
1465 | /* If we are waiting for a particular child, and it exited, |
1466 | linux_wait_for_event will return its exit status. Similarly if | |
1467 | the last child exited. If this is not the last child, however, | |
1468 | do not report it as exited until there is a 'thread exited' response | |
1469 | available in the remote protocol. Instead, just wait for another event. | |
1470 | This should be safe, because if the thread crashed we will already | |
1471 | have reported the termination signal to GDB; that should stop any | |
1472 | in-progress stepping operations, etc. | |
1473 | ||
1474 | Report the exit status of the last thread to exit. This matches | |
1475 | LinuxThreads' behavior. */ | |
1476 | ||
95954743 | 1477 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1478 | { |
bd99dc85 | 1479 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1480 | { |
95954743 PA |
1481 | int pid = pid_of (lwp); |
1482 | struct process_info *process = find_process_pid (pid); | |
5b1c542e | 1483 | |
ca5c370d PA |
1484 | #ifdef USE_THREAD_DB |
1485 | thread_db_free (process, 0); | |
1486 | #endif | |
bd99dc85 | 1487 | delete_lwp (lwp); |
ca5c370d | 1488 | linux_remove_process (process); |
5b1c542e | 1489 | |
bd99dc85 | 1490 | current_inferior = NULL; |
5b1c542e | 1491 | |
bd99dc85 PA |
1492 | if (WIFEXITED (w)) |
1493 | { | |
1494 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1495 | ourstatus->value.integer = WEXITSTATUS (w); | |
1496 | ||
1497 | if (debug_threads) | |
1498 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1499 | } | |
1500 | else | |
1501 | { | |
1502 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1503 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1504 | ||
1505 | if (debug_threads) | |
1506 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1507 | ||
1508 | } | |
5b1c542e | 1509 | |
95954743 | 1510 | return pid_to_ptid (pid); |
0d62e5e8 | 1511 | } |
da6d8c04 | 1512 | } |
0d62e5e8 | 1513 | else |
da6d8c04 | 1514 | { |
0d62e5e8 DJ |
1515 | if (!WIFSTOPPED (w)) |
1516 | goto retry; | |
da6d8c04 DJ |
1517 | } |
1518 | ||
bd99dc85 PA |
1519 | /* In all-stop, stop all threads. Be careful to only do this if |
1520 | we're about to report an event to GDB. */ | |
1521 | if (!non_stop) | |
1522 | stop_all_lwps (); | |
1523 | ||
5b1c542e | 1524 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1525 | |
bd99dc85 PA |
1526 | if (lwp->suspended && WSTOPSIG (w) == SIGSTOP) |
1527 | { | |
1528 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1529 | and it stopped cleanly, so report as SIG0. The use of | |
1530 | SIGSTOP is an implementation detail. */ | |
1531 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1532 | } | |
1533 | else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP) | |
1534 | { | |
1535 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1536 | but, it stopped for other reasons. Set stop_expected so the | |
1537 | pending SIGSTOP is ignored and the LWP is resumed. */ | |
1538 | lwp->stop_expected = 1; | |
1539 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1540 | } | |
1541 | else | |
1542 | { | |
1543 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1544 | } | |
1545 | ||
1546 | if (debug_threads) | |
95954743 PA |
1547 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
1548 | target_pid_to_str (lwp->head.id), | |
bd99dc85 PA |
1549 | ourstatus->kind, |
1550 | ourstatus->value.sig); | |
1551 | ||
95954743 | 1552 | return lwp->head.id; |
bd99dc85 PA |
1553 | } |
1554 | ||
1555 | /* Get rid of any pending event in the pipe. */ | |
1556 | static void | |
1557 | async_file_flush (void) | |
1558 | { | |
1559 | int ret; | |
1560 | char buf; | |
1561 | ||
1562 | do | |
1563 | ret = read (linux_event_pipe[0], &buf, 1); | |
1564 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1565 | } | |
1566 | ||
1567 | /* Put something in the pipe, so the event loop wakes up. */ | |
1568 | static void | |
1569 | async_file_mark (void) | |
1570 | { | |
1571 | int ret; | |
1572 | ||
1573 | async_file_flush (); | |
1574 | ||
1575 | do | |
1576 | ret = write (linux_event_pipe[1], "+", 1); | |
1577 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1578 | ||
1579 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1580 | be awakened anyway. */ | |
1581 | } | |
1582 | ||
95954743 PA |
1583 | static ptid_t |
1584 | linux_wait (ptid_t ptid, | |
1585 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1586 | { |
95954743 | 1587 | ptid_t event_ptid; |
bd99dc85 PA |
1588 | |
1589 | if (debug_threads) | |
95954743 | 1590 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1591 | |
1592 | /* Flush the async file first. */ | |
1593 | if (target_is_async_p ()) | |
1594 | async_file_flush (); | |
1595 | ||
95954743 | 1596 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1597 | |
1598 | /* If at least one stop was reported, there may be more. A single | |
1599 | SIGCHLD can signal more than one child stop. */ | |
1600 | if (target_is_async_p () | |
1601 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1602 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1603 | async_file_mark (); |
1604 | ||
1605 | return event_ptid; | |
da6d8c04 DJ |
1606 | } |
1607 | ||
c5f62d5f | 1608 | /* Send a signal to an LWP. */ |
fd500816 DJ |
1609 | |
1610 | static int | |
a1928bad | 1611 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 1612 | { |
c5f62d5f DE |
1613 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1614 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 1615 | |
c5f62d5f DE |
1616 | #ifdef __NR_tkill |
1617 | { | |
1618 | static int tkill_failed; | |
fd500816 | 1619 | |
c5f62d5f DE |
1620 | if (!tkill_failed) |
1621 | { | |
1622 | int ret; | |
1623 | ||
1624 | errno = 0; | |
1625 | ret = syscall (__NR_tkill, lwpid, signo); | |
1626 | if (errno != ENOSYS) | |
1627 | return ret; | |
1628 | tkill_failed = 1; | |
1629 | } | |
1630 | } | |
fd500816 DJ |
1631 | #endif |
1632 | ||
1633 | return kill (lwpid, signo); | |
1634 | } | |
1635 | ||
0d62e5e8 DJ |
1636 | static void |
1637 | send_sigstop (struct inferior_list_entry *entry) | |
1638 | { | |
54a0b537 | 1639 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1640 | int pid; |
0d62e5e8 | 1641 | |
54a0b537 | 1642 | if (lwp->stopped) |
0d62e5e8 DJ |
1643 | return; |
1644 | ||
bd99dc85 PA |
1645 | pid = lwpid_of (lwp); |
1646 | ||
0d62e5e8 DJ |
1647 | /* If we already have a pending stop signal for this process, don't |
1648 | send another. */ | |
54a0b537 | 1649 | if (lwp->stop_expected) |
0d62e5e8 | 1650 | { |
ae13219e | 1651 | if (debug_threads) |
bd99dc85 | 1652 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e DJ |
1653 | |
1654 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1655 | will receive the SIGSTOP event (instead of silently resuming and | |
1656 | waiting again). It'll be reset below. */ | |
54a0b537 | 1657 | lwp->stop_expected = 0; |
0d62e5e8 DJ |
1658 | return; |
1659 | } | |
1660 | ||
1661 | if (debug_threads) | |
bd99dc85 | 1662 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1663 | |
bd99dc85 | 1664 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1665 | } |
1666 | ||
95954743 PA |
1667 | static void |
1668 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
1669 | { | |
1670 | /* It's dead, really. */ | |
1671 | lwp->dead = 1; | |
1672 | ||
1673 | /* Store the exit status for later. */ | |
1674 | lwp->status_pending_p = 1; | |
1675 | lwp->status_pending = wstat; | |
1676 | ||
1677 | /* So that check_removed_breakpoint doesn't try to figure out if | |
1678 | this is stopped at a breakpoint. */ | |
1679 | lwp->pending_is_breakpoint = 0; | |
1680 | ||
1681 | /* Prevent trying to stop it. */ | |
1682 | lwp->stopped = 1; | |
1683 | ||
1684 | /* No further stops are expected from a dead lwp. */ | |
1685 | lwp->stop_expected = 0; | |
1686 | } | |
1687 | ||
0d62e5e8 DJ |
1688 | static void |
1689 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1690 | { | |
54a0b537 | 1691 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1692 | struct thread_info *saved_inferior; |
a1928bad | 1693 | int wstat; |
95954743 PA |
1694 | ptid_t saved_tid; |
1695 | ptid_t ptid; | |
0d62e5e8 | 1696 | |
54a0b537 | 1697 | if (lwp->stopped) |
0d62e5e8 DJ |
1698 | return; |
1699 | ||
1700 | saved_inferior = current_inferior; | |
bd99dc85 PA |
1701 | if (saved_inferior != NULL) |
1702 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1703 | else | |
95954743 | 1704 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 1705 | |
95954743 | 1706 | ptid = lwp->head.id; |
bd99dc85 PA |
1707 | |
1708 | linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
1709 | |
1710 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1711 | and record the pending SIGSTOP. If the process exited, just | |
1712 | return. */ | |
1713 | if (WIFSTOPPED (wstat) | |
1714 | && WSTOPSIG (wstat) != SIGSTOP) | |
1715 | { | |
1716 | if (debug_threads) | |
24a09b5f | 1717 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
bd99dc85 | 1718 | lwpid_of (lwp), wstat); |
c35fafde PA |
1719 | |
1720 | /* Do not leave a pending single-step finish to be reported to | |
1721 | the client. The client will give us a new action for this | |
1722 | thread, possibly a continue request --- otherwise, the client | |
1723 | would consider this pending SIGTRAP reported later a spurious | |
1724 | signal. */ | |
1725 | if (WSTOPSIG (wstat) == SIGTRAP | |
1726 | && lwp->stepping | |
1727 | && !linux_stopped_by_watchpoint ()) | |
1728 | { | |
1729 | if (debug_threads) | |
1730 | fprintf (stderr, " single-step SIGTRAP ignored\n"); | |
1731 | } | |
1732 | else | |
1733 | { | |
1734 | lwp->status_pending_p = 1; | |
1735 | lwp->status_pending = wstat; | |
1736 | } | |
54a0b537 | 1737 | lwp->stop_expected = 1; |
0d62e5e8 | 1738 | } |
95954743 PA |
1739 | else if (!WIFSTOPPED (wstat)) |
1740 | { | |
1741 | if (debug_threads) | |
1742 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
1743 | lwpid_of (lwp)); | |
1744 | ||
1745 | /* Leave this status pending for the next time we're able to | |
1746 | report it. In the mean time, we'll report this lwp as dead | |
1747 | to GDB, so GDB doesn't try to read registers and memory from | |
1748 | it. */ | |
1749 | mark_lwp_dead (lwp, wstat); | |
1750 | } | |
0d62e5e8 | 1751 | |
bd99dc85 | 1752 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
1753 | current_inferior = saved_inferior; |
1754 | else | |
1755 | { | |
1756 | if (debug_threads) | |
1757 | fprintf (stderr, "Previously current thread died.\n"); | |
1758 | ||
bd99dc85 PA |
1759 | if (non_stop) |
1760 | { | |
1761 | /* We can't change the current inferior behind GDB's back, | |
1762 | otherwise, a subsequent command may apply to the wrong | |
1763 | process. */ | |
1764 | current_inferior = NULL; | |
1765 | } | |
1766 | else | |
1767 | { | |
1768 | /* Set a valid thread as current. */ | |
1769 | set_desired_inferior (0); | |
1770 | } | |
0d62e5e8 DJ |
1771 | } |
1772 | } | |
1773 | ||
1774 | static void | |
54a0b537 | 1775 | stop_all_lwps (void) |
0d62e5e8 DJ |
1776 | { |
1777 | stopping_threads = 1; | |
54a0b537 PA |
1778 | for_each_inferior (&all_lwps, send_sigstop); |
1779 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
1780 | stopping_threads = 0; |
1781 | } | |
1782 | ||
da6d8c04 DJ |
1783 | /* Resume execution of the inferior process. |
1784 | If STEP is nonzero, single-step it. | |
1785 | If SIGNAL is nonzero, give it that signal. */ | |
1786 | ||
ce3a066d | 1787 | static void |
2acc282a | 1788 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 1789 | int step, int signal, siginfo_t *info) |
da6d8c04 | 1790 | { |
0d62e5e8 DJ |
1791 | struct thread_info *saved_inferior; |
1792 | ||
54a0b537 | 1793 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
1794 | return; |
1795 | ||
1796 | /* If we have pending signals or status, and a new signal, enqueue the | |
1797 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1798 | breakpoint; it will be picked up again below. */ | |
1799 | if (signal != 0 | |
54a0b537 PA |
1800 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
1801 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
1802 | { |
1803 | struct pending_signals *p_sig; | |
bca929d3 | 1804 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 1805 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 1806 | p_sig->signal = signal; |
32ca6d61 DJ |
1807 | if (info == NULL) |
1808 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1809 | else | |
1810 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 1811 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
1812 | } |
1813 | ||
54a0b537 | 1814 | if (lwp->status_pending_p && !check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
1815 | return; |
1816 | ||
1817 | saved_inferior = current_inferior; | |
54a0b537 | 1818 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
1819 | |
1820 | if (debug_threads) | |
1b3f6016 | 1821 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 1822 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 1823 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
1824 | |
1825 | /* This bit needs some thinking about. If we get a signal that | |
1826 | we must report while a single-step reinsert is still pending, | |
1827 | we often end up resuming the thread. It might be better to | |
1828 | (ew) allow a stack of pending events; then we could be sure that | |
1829 | the reinsert happened right away and not lose any signals. | |
1830 | ||
1831 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 1832 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
1833 | complete correctness, so it won't solve that problem. It may be |
1834 | worthwhile just to solve this one, however. */ | |
54a0b537 | 1835 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
1836 | { |
1837 | if (debug_threads) | |
54a0b537 | 1838 | fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert); |
0d62e5e8 DJ |
1839 | if (step == 0) |
1840 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1841 | step = 1; | |
1842 | ||
1843 | /* Postpone any pending signal. It was enqueued above. */ | |
1844 | signal = 0; | |
1845 | } | |
1846 | ||
54a0b537 | 1847 | check_removed_breakpoint (lwp); |
0d62e5e8 | 1848 | |
aa691b87 | 1849 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 1850 | { |
442ea881 PA |
1851 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
1852 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 1853 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
1854 | } |
1855 | ||
1856 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1857 | a breakpoint. */ | |
54a0b537 | 1858 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
1859 | { |
1860 | struct pending_signals **p_sig; | |
1861 | ||
54a0b537 | 1862 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
1863 | while ((*p_sig)->prev != NULL) |
1864 | p_sig = &(*p_sig)->prev; | |
1865 | ||
1866 | signal = (*p_sig)->signal; | |
32ca6d61 | 1867 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 1868 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 1869 | |
0d62e5e8 DJ |
1870 | free (*p_sig); |
1871 | *p_sig = NULL; | |
1872 | } | |
1873 | ||
aa5ca48f DE |
1874 | if (the_low_target.prepare_to_resume != NULL) |
1875 | the_low_target.prepare_to_resume (lwp); | |
1876 | ||
0d62e5e8 | 1877 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 1878 | get_lwp_thread (lwp)); |
da6d8c04 | 1879 | errno = 0; |
54a0b537 PA |
1880 | lwp->stopped = 0; |
1881 | lwp->stepping = step; | |
14ce3065 DE |
1882 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
1883 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
1884 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
1885 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
1886 | |
1887 | current_inferior = saved_inferior; | |
da6d8c04 | 1888 | if (errno) |
3221518c UW |
1889 | { |
1890 | /* ESRCH from ptrace either means that the thread was already | |
1891 | running (an error) or that it is gone (a race condition). If | |
1892 | it's gone, we will get a notification the next time we wait, | |
1893 | so we can ignore the error. We could differentiate these | |
1894 | two, but it's tricky without waiting; the thread still exists | |
1895 | as a zombie, so sending it signal 0 would succeed. So just | |
1896 | ignore ESRCH. */ | |
1897 | if (errno == ESRCH) | |
1898 | return; | |
1899 | ||
1900 | perror_with_name ("ptrace"); | |
1901 | } | |
da6d8c04 DJ |
1902 | } |
1903 | ||
2bd7c093 PA |
1904 | struct thread_resume_array |
1905 | { | |
1906 | struct thread_resume *resume; | |
1907 | size_t n; | |
1908 | }; | |
64386c31 DJ |
1909 | |
1910 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1911 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1912 | resume request. | |
1913 | ||
1914 | This algorithm is O(threads * resume elements), but resume elements | |
1915 | is small (and will remain small at least until GDB supports thread | |
1916 | suspension). */ | |
2bd7c093 PA |
1917 | static int |
1918 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 1919 | { |
54a0b537 | 1920 | struct lwp_info *lwp; |
64386c31 | 1921 | struct thread_info *thread; |
5544ad89 | 1922 | int ndx; |
2bd7c093 | 1923 | struct thread_resume_array *r; |
64386c31 DJ |
1924 | |
1925 | thread = (struct thread_info *) entry; | |
54a0b537 | 1926 | lwp = get_thread_lwp (thread); |
2bd7c093 | 1927 | r = arg; |
64386c31 | 1928 | |
2bd7c093 | 1929 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
1930 | { |
1931 | ptid_t ptid = r->resume[ndx].thread; | |
1932 | if (ptid_equal (ptid, minus_one_ptid) | |
1933 | || ptid_equal (ptid, entry->id) | |
1934 | || (ptid_is_pid (ptid) | |
1935 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
1936 | || (ptid_get_lwp (ptid) == -1 | |
1937 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
1938 | { | |
1939 | lwp->resume = &r->resume[ndx]; | |
1940 | return 0; | |
1941 | } | |
1942 | } | |
2bd7c093 PA |
1943 | |
1944 | /* No resume action for this thread. */ | |
1945 | lwp->resume = NULL; | |
64386c31 | 1946 | |
2bd7c093 | 1947 | return 0; |
5544ad89 DJ |
1948 | } |
1949 | ||
5544ad89 | 1950 | |
bd99dc85 PA |
1951 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
1952 | static int | |
1953 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 1954 | { |
bd99dc85 | 1955 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 1956 | |
bd99dc85 PA |
1957 | /* LWPs which will not be resumed are not interesting, because |
1958 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 1959 | if (lwp->resume == NULL) |
bd99dc85 | 1960 | return 0; |
64386c31 | 1961 | |
bd99dc85 PA |
1962 | /* If this thread has a removed breakpoint, we won't have any |
1963 | events to report later, so check now. check_removed_breakpoint | |
1964 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1965 | for any thread that we are not otherwise going to resume - this | |
1966 | lets us preserve stopped status when two threads hit a breakpoint. | |
1967 | GDB removes the breakpoint to single-step a particular thread | |
1968 | past it, then re-inserts it and resumes all threads. We want | |
1969 | to report the second thread without resuming it in the interim. */ | |
1970 | if (lwp->status_pending_p) | |
1971 | check_removed_breakpoint (lwp); | |
5544ad89 | 1972 | |
bd99dc85 PA |
1973 | if (lwp->status_pending_p) |
1974 | * (int *) flag_p = 1; | |
c6ecbae5 | 1975 | |
bd99dc85 | 1976 | return 0; |
5544ad89 DJ |
1977 | } |
1978 | ||
1979 | /* This function is called once per thread. We check the thread's resume | |
1980 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 1981 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 1982 | |
bd99dc85 PA |
1983 | For threads which we aren't explicitly told otherwise, we preserve |
1984 | the stepping flag; this is used for stepping over gdbserver-placed | |
1985 | breakpoints. | |
1986 | ||
1987 | If pending_flags was set in any thread, we queue any needed | |
1988 | signals, since we won't actually resume. We already have a pending | |
1989 | event to report, so we don't need to preserve any step requests; | |
1990 | they should be re-issued if necessary. */ | |
1991 | ||
1992 | static int | |
1993 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 1994 | { |
54a0b537 | 1995 | struct lwp_info *lwp; |
5544ad89 | 1996 | struct thread_info *thread; |
bd99dc85 PA |
1997 | int step; |
1998 | int pending_flag = * (int *) arg; | |
5544ad89 DJ |
1999 | |
2000 | thread = (struct thread_info *) entry; | |
54a0b537 | 2001 | lwp = get_thread_lwp (thread); |
5544ad89 | 2002 | |
2bd7c093 | 2003 | if (lwp->resume == NULL) |
bd99dc85 | 2004 | return 0; |
5544ad89 | 2005 | |
bd99dc85 | 2006 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 2007 | { |
bd99dc85 PA |
2008 | if (debug_threads) |
2009 | fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp)); | |
2010 | ||
2011 | if (!lwp->stopped) | |
2012 | { | |
2013 | if (debug_threads) | |
95954743 | 2014 | fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
2015 | |
2016 | lwp->suspended = 1; | |
2017 | send_sigstop (&lwp->head); | |
2018 | } | |
2019 | else | |
2020 | { | |
2021 | if (debug_threads) | |
2022 | { | |
2023 | if (lwp->suspended) | |
2024 | fprintf (stderr, "already stopped/suspended LWP %ld\n", | |
2025 | lwpid_of (lwp)); | |
2026 | else | |
2027 | fprintf (stderr, "already stopped/not suspended LWP %ld\n", | |
2028 | lwpid_of (lwp)); | |
2029 | } | |
32ca6d61 | 2030 | |
bd99dc85 PA |
2031 | /* Make sure we leave the LWP suspended, so we don't try to |
2032 | resume it without GDB telling us to. FIXME: The LWP may | |
2033 | have been stopped in an internal event that was not meant | |
2034 | to be notified back to GDB (e.g., gdbserver breakpoint), | |
2035 | so we should be reporting a stop event in that case | |
2036 | too. */ | |
2037 | lwp->suspended = 1; | |
2038 | } | |
32ca6d61 | 2039 | |
bd99dc85 PA |
2040 | /* For stop requests, we're done. */ |
2041 | lwp->resume = NULL; | |
2042 | return 0; | |
5544ad89 | 2043 | } |
bd99dc85 PA |
2044 | else |
2045 | lwp->suspended = 0; | |
5544ad89 | 2046 | |
bd99dc85 PA |
2047 | /* If this thread which is about to be resumed has a pending status, |
2048 | then don't resume any threads - we can just report the pending | |
2049 | status. Make sure to queue any signals that would otherwise be | |
2050 | sent. In all-stop mode, we do this decision based on if *any* | |
2051 | thread has a pending status. */ | |
2052 | if (non_stop) | |
2053 | resume_status_pending_p (&lwp->head, &pending_flag); | |
5544ad89 | 2054 | |
bd99dc85 PA |
2055 | if (!pending_flag) |
2056 | { | |
2057 | if (debug_threads) | |
2058 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 2059 | |
95954743 | 2060 | if (ptid_equal (lwp->resume->thread, minus_one_ptid) |
bd99dc85 PA |
2061 | && lwp->stepping |
2062 | && lwp->pending_is_breakpoint) | |
2063 | step = 1; | |
2064 | else | |
2065 | step = (lwp->resume->kind == resume_step); | |
5544ad89 | 2066 | |
2acc282a | 2067 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
2068 | } |
2069 | else | |
2070 | { | |
2071 | if (debug_threads) | |
2072 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 2073 | |
bd99dc85 PA |
2074 | /* If we have a new signal, enqueue the signal. */ |
2075 | if (lwp->resume->sig != 0) | |
2076 | { | |
2077 | struct pending_signals *p_sig; | |
2078 | p_sig = xmalloc (sizeof (*p_sig)); | |
2079 | p_sig->prev = lwp->pending_signals; | |
2080 | p_sig->signal = lwp->resume->sig; | |
2081 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2082 | ||
2083 | /* If this is the same signal we were previously stopped by, | |
2084 | make sure to queue its siginfo. We can ignore the return | |
2085 | value of ptrace; if it fails, we'll skip | |
2086 | PTRACE_SETSIGINFO. */ | |
2087 | if (WIFSTOPPED (lwp->last_status) | |
2088 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
2089 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
2090 | ||
2091 | lwp->pending_signals = p_sig; | |
2092 | } | |
2093 | } | |
5544ad89 | 2094 | |
bd99dc85 | 2095 | lwp->resume = NULL; |
5544ad89 | 2096 | return 0; |
0d62e5e8 DJ |
2097 | } |
2098 | ||
2099 | static void | |
2bd7c093 | 2100 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 2101 | { |
5544ad89 | 2102 | int pending_flag; |
2bd7c093 | 2103 | struct thread_resume_array array = { resume_info, n }; |
c6ecbae5 | 2104 | |
2bd7c093 | 2105 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 DJ |
2106 | |
2107 | /* If there is a thread which would otherwise be resumed, which | |
2108 | has a pending status, then don't resume any threads - we can just | |
2109 | report the pending status. Make sure to queue any signals | |
bd99dc85 PA |
2110 | that would otherwise be sent. In non-stop mode, we'll apply this |
2111 | logic to each thread individually. */ | |
5544ad89 | 2112 | pending_flag = 0; |
bd99dc85 PA |
2113 | if (!non_stop) |
2114 | find_inferior (&all_lwps, resume_status_pending_p, &pending_flag); | |
5544ad89 DJ |
2115 | |
2116 | if (debug_threads) | |
2117 | { | |
2118 | if (pending_flag) | |
2119 | fprintf (stderr, "Not resuming, pending status\n"); | |
2120 | else | |
2121 | fprintf (stderr, "Resuming, no pending status\n"); | |
2122 | } | |
2123 | ||
bd99dc85 | 2124 | find_inferior (&all_threads, linux_resume_one_thread, &pending_flag); |
0d62e5e8 DJ |
2125 | } |
2126 | ||
2127 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
2128 | |
2129 | int | |
0a30fbc4 | 2130 | register_addr (int regnum) |
da6d8c04 DJ |
2131 | { |
2132 | int addr; | |
2133 | ||
2ec06d2e | 2134 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
2135 | error ("Invalid register number %d.", regnum); |
2136 | ||
2ec06d2e | 2137 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2138 | |
2139 | return addr; | |
2140 | } | |
2141 | ||
58caa3dc | 2142 | /* Fetch one register. */ |
da6d8c04 | 2143 | static void |
442ea881 | 2144 | fetch_register (struct regcache *regcache, int regno) |
da6d8c04 DJ |
2145 | { |
2146 | CORE_ADDR regaddr; | |
48d93c75 | 2147 | int i, size; |
0d62e5e8 | 2148 | char *buf; |
95954743 | 2149 | int pid; |
da6d8c04 | 2150 | |
2ec06d2e | 2151 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2152 | return; |
2ec06d2e | 2153 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2154 | return; |
da6d8c04 | 2155 | |
0a30fbc4 DJ |
2156 | regaddr = register_addr (regno); |
2157 | if (regaddr == -1) | |
2158 | return; | |
95954743 PA |
2159 | |
2160 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2161 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2162 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2163 | buf = alloca (size); |
2164 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2165 | { |
2166 | errno = 0; | |
0d62e5e8 | 2167 | *(PTRACE_XFER_TYPE *) (buf + i) = |
14ce3065 DE |
2168 | ptrace (PTRACE_PEEKUSER, pid, |
2169 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2170 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2171 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
da6d8c04 DJ |
2172 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2173 | if (errno != 0) | |
2174 | { | |
2175 | /* Warning, not error, in case we are attached; sometimes the | |
2176 | kernel doesn't let us at the registers. */ | |
2177 | char *err = strerror (errno); | |
2178 | char *msg = alloca (strlen (err) + 128); | |
2179 | sprintf (msg, "reading register %d: %s", regno, err); | |
2180 | error (msg); | |
2181 | goto error_exit; | |
2182 | } | |
2183 | } | |
ee1a7ae4 UW |
2184 | |
2185 | if (the_low_target.supply_ptrace_register) | |
442ea881 | 2186 | the_low_target.supply_ptrace_register (regcache, regno, buf); |
5a1f5858 | 2187 | else |
442ea881 | 2188 | supply_register (regcache, regno, buf); |
0d62e5e8 | 2189 | |
da6d8c04 DJ |
2190 | error_exit:; |
2191 | } | |
2192 | ||
2193 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc | 2194 | static void |
442ea881 | 2195 | usr_fetch_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 2196 | { |
4463ce24 | 2197 | if (regno == -1) |
2ec06d2e | 2198 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 2199 | fetch_register (regcache, regno); |
da6d8c04 | 2200 | else |
442ea881 | 2201 | fetch_register (regcache, regno); |
da6d8c04 DJ |
2202 | } |
2203 | ||
2204 | /* Store our register values back into the inferior. | |
2205 | If REGNO is -1, do this for all registers. | |
2206 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc | 2207 | static void |
442ea881 | 2208 | usr_store_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 DJ |
2209 | { |
2210 | CORE_ADDR regaddr; | |
48d93c75 | 2211 | int i, size; |
0d62e5e8 | 2212 | char *buf; |
55ac2b99 | 2213 | int pid; |
da6d8c04 DJ |
2214 | |
2215 | if (regno >= 0) | |
2216 | { | |
2ec06d2e | 2217 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2218 | return; |
2219 | ||
bc1e36ca | 2220 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2221 | return; |
2222 | ||
2223 | regaddr = register_addr (regno); | |
2224 | if (regaddr == -1) | |
da6d8c04 | 2225 | return; |
da6d8c04 | 2226 | errno = 0; |
48d93c75 UW |
2227 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2228 | & - sizeof (PTRACE_XFER_TYPE); | |
2229 | buf = alloca (size); | |
2230 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2231 | |
2232 | if (the_low_target.collect_ptrace_register) | |
442ea881 | 2233 | the_low_target.collect_ptrace_register (regcache, regno, buf); |
5a1f5858 | 2234 | else |
442ea881 | 2235 | collect_register (regcache, regno, buf); |
ee1a7ae4 | 2236 | |
95954743 | 2237 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2238 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2239 | { |
0a30fbc4 | 2240 | errno = 0; |
14ce3065 DE |
2241 | ptrace (PTRACE_POKEUSER, pid, |
2242 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2243 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
2244 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
2245 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
da6d8c04 DJ |
2246 | if (errno != 0) |
2247 | { | |
1b3f6016 PA |
2248 | /* At this point, ESRCH should mean the process is |
2249 | already gone, in which case we simply ignore attempts | |
2250 | to change its registers. See also the related | |
2251 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2252 | if (errno == ESRCH) |
2253 | return; | |
2254 | ||
bc1e36ca DJ |
2255 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
2256 | { | |
2257 | char *err = strerror (errno); | |
2258 | char *msg = alloca (strlen (err) + 128); | |
2259 | sprintf (msg, "writing register %d: %s", | |
2260 | regno, err); | |
2261 | error (msg); | |
2262 | return; | |
2263 | } | |
da6d8c04 | 2264 | } |
2ff29de4 | 2265 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2266 | } |
da6d8c04 DJ |
2267 | } |
2268 | else | |
2ec06d2e | 2269 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 2270 | usr_store_inferior_registers (regcache, regno); |
da6d8c04 | 2271 | } |
58caa3dc DJ |
2272 | #endif /* HAVE_LINUX_USRREGS */ |
2273 | ||
2274 | ||
2275 | ||
2276 | #ifdef HAVE_LINUX_REGSETS | |
2277 | ||
2278 | static int | |
442ea881 | 2279 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
2280 | { |
2281 | struct regset_info *regset; | |
e9d25b98 | 2282 | int saw_general_regs = 0; |
95954743 | 2283 | int pid; |
58caa3dc DJ |
2284 | |
2285 | regset = target_regsets; | |
2286 | ||
95954743 | 2287 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2288 | while (regset->size >= 0) |
2289 | { | |
2290 | void *buf; | |
2291 | int res; | |
2292 | ||
52fa2412 | 2293 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2294 | { |
2295 | regset ++; | |
2296 | continue; | |
2297 | } | |
2298 | ||
bca929d3 | 2299 | buf = xmalloc (regset->size); |
dfb64f85 | 2300 | #ifndef __sparc__ |
95954743 | 2301 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2302 | #else |
95954743 | 2303 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2304 | #endif |
58caa3dc DJ |
2305 | if (res < 0) |
2306 | { | |
2307 | if (errno == EIO) | |
2308 | { | |
52fa2412 UW |
2309 | /* If we get EIO on a regset, do not try it again for |
2310 | this process. */ | |
2311 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2312 | free (buf); |
52fa2412 | 2313 | continue; |
58caa3dc DJ |
2314 | } |
2315 | else | |
2316 | { | |
0d62e5e8 | 2317 | char s[256]; |
95954743 PA |
2318 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
2319 | pid); | |
0d62e5e8 | 2320 | perror (s); |
58caa3dc DJ |
2321 | } |
2322 | } | |
e9d25b98 DJ |
2323 | else if (regset->type == GENERAL_REGS) |
2324 | saw_general_regs = 1; | |
442ea881 | 2325 | regset->store_function (regcache, buf); |
58caa3dc | 2326 | regset ++; |
fdeb2a12 | 2327 | free (buf); |
58caa3dc | 2328 | } |
e9d25b98 DJ |
2329 | if (saw_general_regs) |
2330 | return 0; | |
2331 | else | |
2332 | return 1; | |
58caa3dc DJ |
2333 | } |
2334 | ||
2335 | static int | |
442ea881 | 2336 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
2337 | { |
2338 | struct regset_info *regset; | |
e9d25b98 | 2339 | int saw_general_regs = 0; |
95954743 | 2340 | int pid; |
58caa3dc DJ |
2341 | |
2342 | regset = target_regsets; | |
2343 | ||
95954743 | 2344 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2345 | while (regset->size >= 0) |
2346 | { | |
2347 | void *buf; | |
2348 | int res; | |
2349 | ||
52fa2412 | 2350 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2351 | { |
2352 | regset ++; | |
2353 | continue; | |
2354 | } | |
2355 | ||
bca929d3 | 2356 | buf = xmalloc (regset->size); |
545587ee DJ |
2357 | |
2358 | /* First fill the buffer with the current register set contents, | |
2359 | in case there are any items in the kernel's regset that are | |
2360 | not in gdbserver's regcache. */ | |
dfb64f85 | 2361 | #ifndef __sparc__ |
95954743 | 2362 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2363 | #else |
95954743 | 2364 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2365 | #endif |
545587ee DJ |
2366 | |
2367 | if (res == 0) | |
2368 | { | |
2369 | /* Then overlay our cached registers on that. */ | |
442ea881 | 2370 | regset->fill_function (regcache, buf); |
545587ee DJ |
2371 | |
2372 | /* Only now do we write the register set. */ | |
dfb64f85 | 2373 | #ifndef __sparc__ |
95954743 | 2374 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 2375 | #else |
95954743 | 2376 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 2377 | #endif |
545587ee DJ |
2378 | } |
2379 | ||
58caa3dc DJ |
2380 | if (res < 0) |
2381 | { | |
2382 | if (errno == EIO) | |
2383 | { | |
52fa2412 UW |
2384 | /* If we get EIO on a regset, do not try it again for |
2385 | this process. */ | |
2386 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2387 | free (buf); |
52fa2412 | 2388 | continue; |
58caa3dc | 2389 | } |
3221518c UW |
2390 | else if (errno == ESRCH) |
2391 | { | |
1b3f6016 PA |
2392 | /* At this point, ESRCH should mean the process is |
2393 | already gone, in which case we simply ignore attempts | |
2394 | to change its registers. See also the related | |
2395 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 2396 | free (buf); |
3221518c UW |
2397 | return 0; |
2398 | } | |
58caa3dc DJ |
2399 | else |
2400 | { | |
ce3a066d | 2401 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
2402 | } |
2403 | } | |
e9d25b98 DJ |
2404 | else if (regset->type == GENERAL_REGS) |
2405 | saw_general_regs = 1; | |
58caa3dc | 2406 | regset ++; |
09ec9b38 | 2407 | free (buf); |
58caa3dc | 2408 | } |
e9d25b98 DJ |
2409 | if (saw_general_regs) |
2410 | return 0; | |
2411 | else | |
2412 | return 1; | |
ce3a066d | 2413 | return 0; |
58caa3dc DJ |
2414 | } |
2415 | ||
2416 | #endif /* HAVE_LINUX_REGSETS */ | |
2417 | ||
2418 | ||
2419 | void | |
442ea881 | 2420 | linux_fetch_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
2421 | { |
2422 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 2423 | if (regsets_fetch_inferior_registers (regcache) == 0) |
52fa2412 | 2424 | return; |
58caa3dc DJ |
2425 | #endif |
2426 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 2427 | usr_fetch_inferior_registers (regcache, regno); |
58caa3dc DJ |
2428 | #endif |
2429 | } | |
2430 | ||
2431 | void | |
442ea881 | 2432 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
2433 | { |
2434 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 2435 | if (regsets_store_inferior_registers (regcache) == 0) |
52fa2412 | 2436 | return; |
58caa3dc DJ |
2437 | #endif |
2438 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 2439 | usr_store_inferior_registers (regcache, regno); |
58caa3dc DJ |
2440 | #endif |
2441 | } | |
2442 | ||
da6d8c04 | 2443 | |
da6d8c04 DJ |
2444 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
2445 | to debugger memory starting at MYADDR. */ | |
2446 | ||
c3e735a6 | 2447 | static int |
f450004a | 2448 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
2449 | { |
2450 | register int i; | |
2451 | /* Round starting address down to longword boundary. */ | |
2452 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2453 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
2454 | register int count |
2455 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
2456 | / sizeof (PTRACE_XFER_TYPE); |
2457 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 2458 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 2459 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
2460 | int fd; |
2461 | char filename[64]; | |
95954743 | 2462 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
2463 | |
2464 | /* Try using /proc. Don't bother for one word. */ | |
2465 | if (len >= 3 * sizeof (long)) | |
2466 | { | |
2467 | /* We could keep this file open and cache it - possibly one per | |
2468 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 2469 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
2470 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
2471 | if (fd == -1) | |
2472 | goto no_proc; | |
2473 | ||
2474 | /* If pread64 is available, use it. It's faster if the kernel | |
2475 | supports it (only one syscall), and it's 64-bit safe even on | |
2476 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
2477 | application). */ | |
2478 | #ifdef HAVE_PREAD64 | |
2479 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
2480 | #else | |
1de1badb | 2481 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
2482 | #endif |
2483 | { | |
2484 | close (fd); | |
2485 | goto no_proc; | |
2486 | } | |
2487 | ||
2488 | close (fd); | |
2489 | return 0; | |
2490 | } | |
da6d8c04 | 2491 | |
fd462a61 | 2492 | no_proc: |
da6d8c04 DJ |
2493 | /* Read all the longwords */ |
2494 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2495 | { | |
c3e735a6 | 2496 | errno = 0; |
14ce3065 DE |
2497 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
2498 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
2499 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
2500 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
2501 | if (errno) |
2502 | return errno; | |
da6d8c04 DJ |
2503 | } |
2504 | ||
2505 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
2506 | memcpy (myaddr, |
2507 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
2508 | len); | |
c3e735a6 DJ |
2509 | |
2510 | return 0; | |
da6d8c04 DJ |
2511 | } |
2512 | ||
2513 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
2514 | to inferior's memory at MEMADDR. | |
2515 | On failure (cannot write the inferior) | |
2516 | returns the value of errno. */ | |
2517 | ||
ce3a066d | 2518 | static int |
f450004a | 2519 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
2520 | { |
2521 | register int i; | |
2522 | /* Round starting address down to longword boundary. */ | |
2523 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2524 | /* Round ending address up; get number of longwords that makes. */ | |
2525 | register int count | |
2526 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
2527 | /* Allocate buffer of that many longwords. */ | |
2528 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 2529 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 2530 | |
0d62e5e8 DJ |
2531 | if (debug_threads) |
2532 | { | |
58d6951d DJ |
2533 | /* Dump up to four bytes. */ |
2534 | unsigned int val = * (unsigned int *) myaddr; | |
2535 | if (len == 1) | |
2536 | val = val & 0xff; | |
2537 | else if (len == 2) | |
2538 | val = val & 0xffff; | |
2539 | else if (len == 3) | |
2540 | val = val & 0xffffff; | |
2541 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
2542 | val, (long)memaddr); | |
0d62e5e8 DJ |
2543 | } |
2544 | ||
da6d8c04 DJ |
2545 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
2546 | ||
14ce3065 DE |
2547 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
2548 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
2549 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
2550 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
da6d8c04 DJ |
2551 | |
2552 | if (count > 1) | |
2553 | { | |
2554 | buffer[count - 1] | |
95954743 | 2555 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
2556 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
2557 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
2558 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
2559 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 2560 | 0); |
da6d8c04 DJ |
2561 | } |
2562 | ||
2563 | /* Copy data to be written over corresponding part of buffer */ | |
2564 | ||
2565 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
2566 | ||
2567 | /* Write the entire buffer. */ | |
2568 | ||
2569 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2570 | { | |
2571 | errno = 0; | |
14ce3065 DE |
2572 | ptrace (PTRACE_POKETEXT, pid, |
2573 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2574 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
2575 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
2576 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
2577 | if (errno) |
2578 | return errno; | |
2579 | } | |
2580 | ||
2581 | return 0; | |
2582 | } | |
2f2893d9 | 2583 | |
6076632b | 2584 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
2585 | static int linux_supports_tracefork_flag; |
2586 | ||
51c2684e | 2587 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 2588 | |
51c2684e DJ |
2589 | static int |
2590 | linux_tracefork_grandchild (void *arg) | |
2591 | { | |
2592 | _exit (0); | |
2593 | } | |
2594 | ||
7407e2de AS |
2595 | #define STACK_SIZE 4096 |
2596 | ||
51c2684e DJ |
2597 | static int |
2598 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
2599 | { |
2600 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
2601 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
2602 | |
2603 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
2604 | ||
2605 | if (fork () == 0) | |
2606 | linux_tracefork_grandchild (NULL); | |
2607 | ||
2608 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
2609 | ||
7407e2de AS |
2610 | #ifdef __ia64__ |
2611 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
2612 | CLONE_VM | SIGCHLD, NULL); | |
2613 | #else | |
2614 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
2615 | CLONE_VM | SIGCHLD, NULL); | |
2616 | #endif | |
e4b7f41c JK |
2617 | |
2618 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
2619 | ||
24a09b5f DJ |
2620 | _exit (0); |
2621 | } | |
2622 | ||
24a09b5f DJ |
2623 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
2624 | sure that we can enable the option, and that it had the desired | |
2625 | effect. */ | |
2626 | ||
2627 | static void | |
2628 | linux_test_for_tracefork (void) | |
2629 | { | |
2630 | int child_pid, ret, status; | |
2631 | long second_pid; | |
e4b7f41c | 2632 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 2633 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 2634 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
2635 | |
2636 | linux_supports_tracefork_flag = 0; | |
2637 | ||
e4b7f41c JK |
2638 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
2639 | ||
2640 | child_pid = fork (); | |
2641 | if (child_pid == 0) | |
2642 | linux_tracefork_child (NULL); | |
2643 | ||
2644 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
2645 | ||
51c2684e | 2646 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
2647 | #ifdef __ia64__ |
2648 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
2649 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 2650 | #else /* !__ia64__ */ |
7407e2de AS |
2651 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
2652 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
2653 | #endif /* !__ia64__ */ |
2654 | ||
2655 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
2656 | ||
24a09b5f | 2657 | if (child_pid == -1) |
51c2684e | 2658 | perror_with_name ("clone"); |
24a09b5f DJ |
2659 | |
2660 | ret = my_waitpid (child_pid, &status, 0); | |
2661 | if (ret == -1) | |
2662 | perror_with_name ("waitpid"); | |
2663 | else if (ret != child_pid) | |
2664 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
2665 | if (! WIFSTOPPED (status)) | |
2666 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
2667 | ||
14ce3065 DE |
2668 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
2669 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
2670 | if (ret != 0) |
2671 | { | |
2672 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2673 | if (ret != 0) | |
2674 | { | |
2675 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2676 | return; | |
2677 | } | |
2678 | ||
2679 | ret = my_waitpid (child_pid, &status, 0); | |
2680 | if (ret != child_pid) | |
2681 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
2682 | else if (!WIFSIGNALED (status)) | |
2683 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
2684 | "killed child", status); | |
2685 | ||
2686 | return; | |
2687 | } | |
2688 | ||
2689 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
2690 | if (ret != 0) | |
2691 | warning ("linux_test_for_tracefork: failed to resume child"); | |
2692 | ||
2693 | ret = my_waitpid (child_pid, &status, 0); | |
2694 | ||
2695 | if (ret == child_pid && WIFSTOPPED (status) | |
2696 | && status >> 16 == PTRACE_EVENT_FORK) | |
2697 | { | |
2698 | second_pid = 0; | |
2699 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
2700 | if (ret == 0 && second_pid != 0) | |
2701 | { | |
2702 | int second_status; | |
2703 | ||
2704 | linux_supports_tracefork_flag = 1; | |
2705 | my_waitpid (second_pid, &second_status, 0); | |
2706 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
2707 | if (ret != 0) | |
2708 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
2709 | my_waitpid (second_pid, &status, 0); | |
2710 | } | |
2711 | } | |
2712 | else | |
2713 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
2714 | "(%d, status 0x%x)", ret, status); | |
2715 | ||
2716 | do | |
2717 | { | |
2718 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2719 | if (ret != 0) | |
2720 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2721 | my_waitpid (child_pid, &status, 0); | |
2722 | } | |
2723 | while (WIFSTOPPED (status)); | |
51c2684e | 2724 | |
e4b7f41c | 2725 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 2726 | free (stack); |
e4b7f41c | 2727 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
2728 | } |
2729 | ||
2730 | ||
2f2893d9 DJ |
2731 | static void |
2732 | linux_look_up_symbols (void) | |
2733 | { | |
0d62e5e8 | 2734 | #ifdef USE_THREAD_DB |
95954743 PA |
2735 | struct process_info *proc = current_process (); |
2736 | ||
cdbfd419 | 2737 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
2738 | return; |
2739 | ||
6076632b DE |
2740 | /* If the kernel supports tracing forks then it also supports tracing |
2741 | clones, and then we don't need to use the magic thread event breakpoint | |
2742 | to learn about threads. */ | |
cdbfd419 | 2743 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
2744 | #endif |
2745 | } | |
2746 | ||
e5379b03 | 2747 | static void |
ef57601b | 2748 | linux_request_interrupt (void) |
e5379b03 | 2749 | { |
a1928bad | 2750 | extern unsigned long signal_pid; |
e5379b03 | 2751 | |
95954743 PA |
2752 | if (!ptid_equal (cont_thread, null_ptid) |
2753 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 2754 | { |
54a0b537 | 2755 | struct lwp_info *lwp; |
bd99dc85 | 2756 | int lwpid; |
e5379b03 | 2757 | |
54a0b537 | 2758 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
2759 | lwpid = lwpid_of (lwp); |
2760 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
2761 | } |
2762 | else | |
ef57601b | 2763 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
2764 | } |
2765 | ||
aa691b87 RM |
2766 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
2767 | to debugger memory starting at MYADDR. */ | |
2768 | ||
2769 | static int | |
f450004a | 2770 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
2771 | { |
2772 | char filename[PATH_MAX]; | |
2773 | int fd, n; | |
95954743 | 2774 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 2775 | |
95954743 | 2776 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
2777 | |
2778 | fd = open (filename, O_RDONLY); | |
2779 | if (fd < 0) | |
2780 | return -1; | |
2781 | ||
2782 | if (offset != (CORE_ADDR) 0 | |
2783 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
2784 | n = -1; | |
2785 | else | |
2786 | n = read (fd, myaddr, len); | |
2787 | ||
2788 | close (fd); | |
2789 | ||
2790 | return n; | |
2791 | } | |
2792 | ||
d993e290 PA |
2793 | /* These breakpoint and watchpoint related wrapper functions simply |
2794 | pass on the function call if the target has registered a | |
2795 | corresponding function. */ | |
e013ee27 OF |
2796 | |
2797 | static int | |
d993e290 | 2798 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2799 | { |
d993e290 PA |
2800 | if (the_low_target.insert_point != NULL) |
2801 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
2802 | else |
2803 | /* Unsupported (see target.h). */ | |
2804 | return 1; | |
2805 | } | |
2806 | ||
2807 | static int | |
d993e290 | 2808 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2809 | { |
d993e290 PA |
2810 | if (the_low_target.remove_point != NULL) |
2811 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
2812 | else |
2813 | /* Unsupported (see target.h). */ | |
2814 | return 1; | |
2815 | } | |
2816 | ||
2817 | static int | |
2818 | linux_stopped_by_watchpoint (void) | |
2819 | { | |
2820 | if (the_low_target.stopped_by_watchpoint != NULL) | |
2821 | return the_low_target.stopped_by_watchpoint (); | |
2822 | else | |
2823 | return 0; | |
2824 | } | |
2825 | ||
2826 | static CORE_ADDR | |
2827 | linux_stopped_data_address (void) | |
2828 | { | |
2829 | if (the_low_target.stopped_data_address != NULL) | |
2830 | return the_low_target.stopped_data_address (); | |
2831 | else | |
2832 | return 0; | |
2833 | } | |
2834 | ||
42c81e2a | 2835 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
2836 | #if defined(__mcoldfire__) |
2837 | /* These should really be defined in the kernel's ptrace.h header. */ | |
2838 | #define PT_TEXT_ADDR 49*4 | |
2839 | #define PT_DATA_ADDR 50*4 | |
2840 | #define PT_TEXT_END_ADDR 51*4 | |
2841 | #endif | |
2842 | ||
2843 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
2844 | to tell gdb about. */ | |
2845 | ||
2846 | static int | |
2847 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
2848 | { | |
2849 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
2850 | unsigned long text, text_end, data; | |
bd99dc85 | 2851 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
2852 | |
2853 | errno = 0; | |
2854 | ||
2855 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
2856 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
2857 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
2858 | ||
2859 | if (errno == 0) | |
2860 | { | |
2861 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
2862 | used by gdb) are relative to the beginning of the program, |
2863 | with the data segment immediately following the text segment. | |
2864 | However, the actual runtime layout in memory may put the data | |
2865 | somewhere else, so when we send gdb a data base-address, we | |
2866 | use the real data base address and subtract the compile-time | |
2867 | data base-address from it (which is just the length of the | |
2868 | text segment). BSS immediately follows data in both | |
2869 | cases. */ | |
52fb6437 NS |
2870 | *text_p = text; |
2871 | *data_p = data - (text_end - text); | |
1b3f6016 | 2872 | |
52fb6437 NS |
2873 | return 1; |
2874 | } | |
2875 | #endif | |
2876 | return 0; | |
2877 | } | |
2878 | #endif | |
2879 | ||
dc146f7c VP |
2880 | static int |
2881 | compare_ints (const void *xa, const void *xb) | |
2882 | { | |
2883 | int a = *(const int *)xa; | |
2884 | int b = *(const int *)xb; | |
2885 | ||
2886 | return a - b; | |
2887 | } | |
2888 | ||
2889 | static int * | |
2890 | unique (int *b, int *e) | |
2891 | { | |
2892 | int *d = b; | |
2893 | while (++b != e) | |
2894 | if (*d != *b) | |
2895 | *++d = *b; | |
2896 | return ++d; | |
2897 | } | |
2898 | ||
2899 | /* Given PID, iterates over all threads in that process. | |
2900 | ||
2901 | Information about each thread, in a format suitable for qXfer:osdata:thread | |
2902 | is printed to BUFFER, if it's not NULL. BUFFER is assumed to be already | |
2903 | initialized, and the caller is responsible for finishing and appending '\0' | |
2904 | to it. | |
2905 | ||
2906 | The list of cores that threads are running on is assigned to *CORES, if it | |
2907 | is not NULL. If no cores are found, *CORES will be set to NULL. Caller | |
2908 | should free *CORES. */ | |
2909 | ||
2910 | static void | |
2911 | list_threads (int pid, struct buffer *buffer, char **cores) | |
2912 | { | |
2913 | int count = 0; | |
2914 | int allocated = 10; | |
2915 | int *core_numbers = xmalloc (sizeof (int) * allocated); | |
2916 | char pathname[128]; | |
2917 | DIR *dir; | |
2918 | struct dirent *dp; | |
2919 | struct stat statbuf; | |
2920 | ||
2921 | sprintf (pathname, "/proc/%d/task", pid); | |
2922 | if (stat (pathname, &statbuf) == 0 && S_ISDIR (statbuf.st_mode)) | |
2923 | { | |
2924 | dir = opendir (pathname); | |
2925 | if (!dir) | |
2926 | { | |
2927 | free (core_numbers); | |
2928 | return; | |
2929 | } | |
2930 | ||
2931 | while ((dp = readdir (dir)) != NULL) | |
2932 | { | |
2933 | unsigned long lwp = strtoul (dp->d_name, NULL, 10); | |
2934 | ||
2935 | if (lwp != 0) | |
2936 | { | |
2937 | unsigned core = linux_core_of_thread (ptid_build (pid, lwp, 0)); | |
2938 | ||
2939 | if (core != -1) | |
2940 | { | |
2941 | char s[sizeof ("4294967295")]; | |
2942 | sprintf (s, "%u", core); | |
2943 | ||
2944 | if (count == allocated) | |
2945 | { | |
2946 | allocated *= 2; | |
2947 | core_numbers = realloc (core_numbers, | |
2948 | sizeof (int) * allocated); | |
2949 | } | |
2950 | core_numbers[count++] = core; | |
2951 | if (buffer) | |
2952 | buffer_xml_printf (buffer, | |
2953 | "<item>" | |
2954 | "<column name=\"pid\">%d</column>" | |
2955 | "<column name=\"tid\">%s</column>" | |
2956 | "<column name=\"core\">%s</column>" | |
2957 | "</item>", pid, dp->d_name, s); | |
2958 | } | |
2959 | else | |
2960 | { | |
2961 | if (buffer) | |
2962 | buffer_xml_printf (buffer, | |
2963 | "<item>" | |
2964 | "<column name=\"pid\">%d</column>" | |
2965 | "<column name=\"tid\">%s</column>" | |
2966 | "</item>", pid, dp->d_name); | |
2967 | } | |
2968 | } | |
2969 | } | |
2970 | } | |
2971 | ||
2972 | if (cores) | |
2973 | { | |
2974 | *cores = NULL; | |
2975 | if (count > 0) | |
2976 | { | |
2977 | struct buffer buffer2; | |
2978 | int *b; | |
2979 | int *e; | |
2980 | qsort (core_numbers, count, sizeof (int), compare_ints); | |
2981 | ||
2982 | /* Remove duplicates. */ | |
2983 | b = core_numbers; | |
2984 | e = unique (b, core_numbers + count); | |
2985 | ||
2986 | buffer_init (&buffer2); | |
2987 | ||
2988 | for (b = core_numbers; b != e; ++b) | |
2989 | { | |
2990 | char number[sizeof ("4294967295")]; | |
2991 | sprintf (number, "%u", *b); | |
2992 | buffer_xml_printf (&buffer2, "%s%s", | |
2993 | (b == core_numbers) ? "" : ",", number); | |
2994 | } | |
2995 | buffer_grow_str0 (&buffer2, ""); | |
2996 | ||
2997 | *cores = buffer_finish (&buffer2); | |
2998 | } | |
2999 | } | |
3000 | free (core_numbers); | |
3001 | } | |
3002 | ||
3003 | static void | |
3004 | show_process (int pid, const char *username, struct buffer *buffer) | |
3005 | { | |
3006 | char pathname[128]; | |
3007 | FILE *f; | |
3008 | char cmd[MAXPATHLEN + 1]; | |
3009 | ||
3010 | sprintf (pathname, "/proc/%d/cmdline", pid); | |
3011 | ||
3012 | if ((f = fopen (pathname, "r")) != NULL) | |
3013 | { | |
3014 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
3015 | if (len > 0) | |
3016 | { | |
3017 | char *cores = 0; | |
3018 | int i; | |
3019 | for (i = 0; i < len; i++) | |
3020 | if (cmd[i] == '\0') | |
3021 | cmd[i] = ' '; | |
3022 | cmd[len] = '\0'; | |
3023 | ||
3024 | buffer_xml_printf (buffer, | |
3025 | "<item>" | |
3026 | "<column name=\"pid\">%d</column>" | |
3027 | "<column name=\"user\">%s</column>" | |
3028 | "<column name=\"command\">%s</column>", | |
3029 | pid, | |
3030 | username, | |
3031 | cmd); | |
3032 | ||
3033 | /* This only collects core numbers, and does not print threads. */ | |
3034 | list_threads (pid, NULL, &cores); | |
3035 | ||
3036 | if (cores) | |
3037 | { | |
3038 | buffer_xml_printf (buffer, | |
3039 | "<column name=\"cores\">%s</column>", cores); | |
3040 | free (cores); | |
3041 | } | |
3042 | ||
3043 | buffer_xml_printf (buffer, "</item>"); | |
3044 | } | |
3045 | fclose (f); | |
3046 | } | |
3047 | } | |
3048 | ||
07e059b5 VP |
3049 | static int |
3050 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
3051 | unsigned char *readbuf, unsigned const char *writebuf, |
3052 | CORE_ADDR offset, int len) | |
07e059b5 VP |
3053 | { |
3054 | /* We make the process list snapshot when the object starts to be | |
3055 | read. */ | |
3056 | static const char *buf; | |
3057 | static long len_avail = -1; | |
3058 | static struct buffer buffer; | |
dc146f7c VP |
3059 | int processes = 0; |
3060 | int threads = 0; | |
07e059b5 VP |
3061 | |
3062 | DIR *dirp; | |
3063 | ||
dc146f7c VP |
3064 | if (strcmp (annex, "processes") == 0) |
3065 | processes = 1; | |
3066 | else if (strcmp (annex, "threads") == 0) | |
3067 | threads = 1; | |
3068 | else | |
07e059b5 VP |
3069 | return 0; |
3070 | ||
3071 | if (!readbuf || writebuf) | |
3072 | return 0; | |
3073 | ||
3074 | if (offset == 0) | |
3075 | { | |
3076 | if (len_avail != -1 && len_avail != 0) | |
3077 | buffer_free (&buffer); | |
3078 | len_avail = 0; | |
3079 | buf = NULL; | |
3080 | buffer_init (&buffer); | |
dc146f7c VP |
3081 | if (processes) |
3082 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
3083 | else if (threads) | |
3084 | buffer_grow_str (&buffer, "<osdata type=\"threads\">"); | |
07e059b5 VP |
3085 | |
3086 | dirp = opendir ("/proc"); | |
3087 | if (dirp) | |
3088 | { | |
1b3f6016 PA |
3089 | struct dirent *dp; |
3090 | while ((dp = readdir (dirp)) != NULL) | |
3091 | { | |
3092 | struct stat statbuf; | |
3093 | char procentry[sizeof ("/proc/4294967295")]; | |
3094 | ||
3095 | if (!isdigit (dp->d_name[0]) | |
3096 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
3097 | continue; | |
3098 | ||
3099 | sprintf (procentry, "/proc/%s", dp->d_name); | |
3100 | if (stat (procentry, &statbuf) == 0 | |
3101 | && S_ISDIR (statbuf.st_mode)) | |
3102 | { | |
dc146f7c | 3103 | int pid = (int) strtoul (dp->d_name, NULL, 10); |
1b3f6016 | 3104 | |
dc146f7c | 3105 | if (processes) |
1b3f6016 | 3106 | { |
dc146f7c VP |
3107 | struct passwd *entry = getpwuid (statbuf.st_uid); |
3108 | show_process (pid, entry ? entry->pw_name : "?", &buffer); | |
3109 | } | |
3110 | else if (threads) | |
3111 | { | |
3112 | list_threads (pid, &buffer, NULL); | |
1b3f6016 PA |
3113 | } |
3114 | } | |
3115 | } | |
07e059b5 | 3116 | |
1b3f6016 | 3117 | closedir (dirp); |
07e059b5 VP |
3118 | } |
3119 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
3120 | buf = buffer_finish (&buffer); | |
3121 | len_avail = strlen (buf); | |
3122 | } | |
3123 | ||
3124 | if (offset >= len_avail) | |
3125 | { | |
3126 | /* Done. Get rid of the data. */ | |
3127 | buffer_free (&buffer); | |
3128 | buf = NULL; | |
3129 | len_avail = 0; | |
3130 | return 0; | |
3131 | } | |
3132 | ||
3133 | if (len > len_avail - offset) | |
3134 | len = len_avail - offset; | |
3135 | memcpy (readbuf, buf + offset, len); | |
3136 | ||
3137 | return len; | |
3138 | } | |
3139 | ||
d0722149 DE |
3140 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3141 | layout of the inferiors' architecture. */ | |
3142 | ||
3143 | static void | |
3144 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
3145 | { | |
3146 | int done = 0; | |
3147 | ||
3148 | if (the_low_target.siginfo_fixup != NULL) | |
3149 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
3150 | ||
3151 | /* If there was no callback, or the callback didn't do anything, | |
3152 | then just do a straight memcpy. */ | |
3153 | if (!done) | |
3154 | { | |
3155 | if (direction == 1) | |
3156 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3157 | else | |
3158 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3159 | } | |
3160 | } | |
3161 | ||
4aa995e1 PA |
3162 | static int |
3163 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
3164 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
3165 | { | |
d0722149 | 3166 | int pid; |
4aa995e1 | 3167 | struct siginfo siginfo; |
d0722149 | 3168 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3169 | |
3170 | if (current_inferior == NULL) | |
3171 | return -1; | |
3172 | ||
bd99dc85 | 3173 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
3174 | |
3175 | if (debug_threads) | |
d0722149 | 3176 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
3177 | readbuf != NULL ? "Reading" : "Writing", |
3178 | pid); | |
3179 | ||
3180 | if (offset > sizeof (siginfo)) | |
3181 | return -1; | |
3182 | ||
3183 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
3184 | return -1; | |
3185 | ||
d0722149 DE |
3186 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
3187 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3188 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
3189 | with a 32-bit GDBSERVER, we need to convert it. */ | |
3190 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3191 | ||
4aa995e1 PA |
3192 | if (offset + len > sizeof (siginfo)) |
3193 | len = sizeof (siginfo) - offset; | |
3194 | ||
3195 | if (readbuf != NULL) | |
d0722149 | 3196 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3197 | else |
3198 | { | |
d0722149 DE |
3199 | memcpy (inf_siginfo + offset, writebuf, len); |
3200 | ||
3201 | /* Convert back to ptrace layout before flushing it out. */ | |
3202 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3203 | ||
4aa995e1 PA |
3204 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
3205 | return -1; | |
3206 | } | |
3207 | ||
3208 | return len; | |
3209 | } | |
3210 | ||
bd99dc85 PA |
3211 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
3212 | so we notice when children change state; as the handler for the | |
3213 | sigsuspend in my_waitpid. */ | |
3214 | ||
3215 | static void | |
3216 | sigchld_handler (int signo) | |
3217 | { | |
3218 | int old_errno = errno; | |
3219 | ||
3220 | if (debug_threads) | |
3221 | /* fprintf is not async-signal-safe, so call write directly. */ | |
3222 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
3223 | ||
3224 | if (target_is_async_p ()) | |
3225 | async_file_mark (); /* trigger a linux_wait */ | |
3226 | ||
3227 | errno = old_errno; | |
3228 | } | |
3229 | ||
3230 | static int | |
3231 | linux_supports_non_stop (void) | |
3232 | { | |
3233 | return 1; | |
3234 | } | |
3235 | ||
3236 | static int | |
3237 | linux_async (int enable) | |
3238 | { | |
3239 | int previous = (linux_event_pipe[0] != -1); | |
3240 | ||
3241 | if (previous != enable) | |
3242 | { | |
3243 | sigset_t mask; | |
3244 | sigemptyset (&mask); | |
3245 | sigaddset (&mask, SIGCHLD); | |
3246 | ||
3247 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
3248 | ||
3249 | if (enable) | |
3250 | { | |
3251 | if (pipe (linux_event_pipe) == -1) | |
3252 | fatal ("creating event pipe failed."); | |
3253 | ||
3254 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
3255 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
3256 | ||
3257 | /* Register the event loop handler. */ | |
3258 | add_file_handler (linux_event_pipe[0], | |
3259 | handle_target_event, NULL); | |
3260 | ||
3261 | /* Always trigger a linux_wait. */ | |
3262 | async_file_mark (); | |
3263 | } | |
3264 | else | |
3265 | { | |
3266 | delete_file_handler (linux_event_pipe[0]); | |
3267 | ||
3268 | close (linux_event_pipe[0]); | |
3269 | close (linux_event_pipe[1]); | |
3270 | linux_event_pipe[0] = -1; | |
3271 | linux_event_pipe[1] = -1; | |
3272 | } | |
3273 | ||
3274 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
3275 | } | |
3276 | ||
3277 | return previous; | |
3278 | } | |
3279 | ||
3280 | static int | |
3281 | linux_start_non_stop (int nonstop) | |
3282 | { | |
3283 | /* Register or unregister from event-loop accordingly. */ | |
3284 | linux_async (nonstop); | |
3285 | return 0; | |
3286 | } | |
3287 | ||
cf8fd78b PA |
3288 | static int |
3289 | linux_supports_multi_process (void) | |
3290 | { | |
3291 | return 1; | |
3292 | } | |
3293 | ||
efcbbd14 UW |
3294 | |
3295 | /* Enumerate spufs IDs for process PID. */ | |
3296 | static int | |
3297 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
3298 | { | |
3299 | int pos = 0; | |
3300 | int written = 0; | |
3301 | char path[128]; | |
3302 | DIR *dir; | |
3303 | struct dirent *entry; | |
3304 | ||
3305 | sprintf (path, "/proc/%ld/fd", pid); | |
3306 | dir = opendir (path); | |
3307 | if (!dir) | |
3308 | return -1; | |
3309 | ||
3310 | rewinddir (dir); | |
3311 | while ((entry = readdir (dir)) != NULL) | |
3312 | { | |
3313 | struct stat st; | |
3314 | struct statfs stfs; | |
3315 | int fd; | |
3316 | ||
3317 | fd = atoi (entry->d_name); | |
3318 | if (!fd) | |
3319 | continue; | |
3320 | ||
3321 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
3322 | if (stat (path, &st) != 0) | |
3323 | continue; | |
3324 | if (!S_ISDIR (st.st_mode)) | |
3325 | continue; | |
3326 | ||
3327 | if (statfs (path, &stfs) != 0) | |
3328 | continue; | |
3329 | if (stfs.f_type != SPUFS_MAGIC) | |
3330 | continue; | |
3331 | ||
3332 | if (pos >= offset && pos + 4 <= offset + len) | |
3333 | { | |
3334 | *(unsigned int *)(buf + pos - offset) = fd; | |
3335 | written += 4; | |
3336 | } | |
3337 | pos += 4; | |
3338 | } | |
3339 | ||
3340 | closedir (dir); | |
3341 | return written; | |
3342 | } | |
3343 | ||
3344 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
3345 | object type, using the /proc file system. */ | |
3346 | static int | |
3347 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
3348 | unsigned const char *writebuf, | |
3349 | CORE_ADDR offset, int len) | |
3350 | { | |
3351 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
3352 | char buf[128]; | |
3353 | int fd = 0; | |
3354 | int ret = 0; | |
3355 | ||
3356 | if (!writebuf && !readbuf) | |
3357 | return -1; | |
3358 | ||
3359 | if (!*annex) | |
3360 | { | |
3361 | if (!readbuf) | |
3362 | return -1; | |
3363 | else | |
3364 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
3365 | } | |
3366 | ||
3367 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
3368 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
3369 | if (fd <= 0) | |
3370 | return -1; | |
3371 | ||
3372 | if (offset != 0 | |
3373 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
3374 | { | |
3375 | close (fd); | |
3376 | return 0; | |
3377 | } | |
3378 | ||
3379 | if (writebuf) | |
3380 | ret = write (fd, writebuf, (size_t) len); | |
3381 | else | |
3382 | ret = read (fd, readbuf, (size_t) len); | |
3383 | ||
3384 | close (fd); | |
3385 | return ret; | |
3386 | } | |
3387 | ||
dc146f7c VP |
3388 | static int |
3389 | linux_core_of_thread (ptid_t ptid) | |
3390 | { | |
3391 | char filename[sizeof ("/proc//task//stat") | |
3392 | + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */ | |
3393 | + 1]; | |
3394 | FILE *f; | |
3395 | char *content = NULL; | |
3396 | char *p; | |
3397 | char *ts = 0; | |
3398 | int content_read = 0; | |
3399 | int i; | |
3400 | int core; | |
3401 | ||
3402 | sprintf (filename, "/proc/%d/task/%ld/stat", | |
3403 | ptid_get_pid (ptid), ptid_get_lwp (ptid)); | |
3404 | f = fopen (filename, "r"); | |
3405 | if (!f) | |
3406 | return -1; | |
3407 | ||
3408 | for (;;) | |
3409 | { | |
3410 | int n; | |
3411 | content = realloc (content, content_read + 1024); | |
3412 | n = fread (content + content_read, 1, 1024, f); | |
3413 | content_read += n; | |
3414 | if (n < 1024) | |
3415 | { | |
3416 | content[content_read] = '\0'; | |
3417 | break; | |
3418 | } | |
3419 | } | |
3420 | ||
3421 | p = strchr (content, '('); | |
3422 | p = strchr (p, ')') + 2; /* skip ")" and a whitespace. */ | |
3423 | ||
3424 | p = strtok_r (p, " ", &ts); | |
3425 | for (i = 0; i != 36; ++i) | |
3426 | p = strtok_r (NULL, " ", &ts); | |
3427 | ||
3428 | if (sscanf (p, "%d", &core) == 0) | |
3429 | core = -1; | |
3430 | ||
3431 | free (content); | |
3432 | fclose (f); | |
3433 | ||
3434 | return core; | |
3435 | } | |
3436 | ||
ce3a066d DJ |
3437 | static struct target_ops linux_target_ops = { |
3438 | linux_create_inferior, | |
3439 | linux_attach, | |
3440 | linux_kill, | |
6ad8ae5c | 3441 | linux_detach, |
444d6139 | 3442 | linux_join, |
ce3a066d DJ |
3443 | linux_thread_alive, |
3444 | linux_resume, | |
3445 | linux_wait, | |
3446 | linux_fetch_registers, | |
3447 | linux_store_registers, | |
3448 | linux_read_memory, | |
3449 | linux_write_memory, | |
2f2893d9 | 3450 | linux_look_up_symbols, |
ef57601b | 3451 | linux_request_interrupt, |
aa691b87 | 3452 | linux_read_auxv, |
d993e290 PA |
3453 | linux_insert_point, |
3454 | linux_remove_point, | |
e013ee27 OF |
3455 | linux_stopped_by_watchpoint, |
3456 | linux_stopped_data_address, | |
42c81e2a | 3457 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 3458 | linux_read_offsets, |
dae5f5cf DJ |
3459 | #else |
3460 | NULL, | |
3461 | #endif | |
3462 | #ifdef USE_THREAD_DB | |
3463 | thread_db_get_tls_address, | |
3464 | #else | |
3465 | NULL, | |
52fb6437 | 3466 | #endif |
efcbbd14 | 3467 | linux_qxfer_spu, |
59a016f0 | 3468 | hostio_last_error_from_errno, |
07e059b5 | 3469 | linux_qxfer_osdata, |
4aa995e1 | 3470 | linux_xfer_siginfo, |
bd99dc85 PA |
3471 | linux_supports_non_stop, |
3472 | linux_async, | |
3473 | linux_start_non_stop, | |
cdbfd419 PP |
3474 | linux_supports_multi_process, |
3475 | #ifdef USE_THREAD_DB | |
dc146f7c | 3476 | thread_db_handle_monitor_command, |
cdbfd419 | 3477 | #else |
dc146f7c | 3478 | NULL, |
cdbfd419 | 3479 | #endif |
dc146f7c | 3480 | linux_core_of_thread |
ce3a066d DJ |
3481 | }; |
3482 | ||
0d62e5e8 DJ |
3483 | static void |
3484 | linux_init_signals () | |
3485 | { | |
3486 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
3487 | to find what the cancel signal actually is. */ | |
60c3d7b0 | 3488 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 3489 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 3490 | #endif |
0d62e5e8 DJ |
3491 | } |
3492 | ||
da6d8c04 DJ |
3493 | void |
3494 | initialize_low (void) | |
3495 | { | |
bd99dc85 PA |
3496 | struct sigaction sigchld_action; |
3497 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 3498 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
3499 | set_breakpoint_data (the_low_target.breakpoint, |
3500 | the_low_target.breakpoint_len); | |
0d62e5e8 | 3501 | linux_init_signals (); |
24a09b5f | 3502 | linux_test_for_tracefork (); |
52fa2412 UW |
3503 | #ifdef HAVE_LINUX_REGSETS |
3504 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
3505 | ; | |
bca929d3 | 3506 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 3507 | #endif |
bd99dc85 PA |
3508 | |
3509 | sigchld_action.sa_handler = sigchld_handler; | |
3510 | sigemptyset (&sigchld_action.sa_mask); | |
3511 | sigchld_action.sa_flags = SA_RESTART; | |
3512 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 3513 | } |