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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); |
95954743 | 143 | static void *add_lwp (ptid_t ptid); |
c35fafde | 144 | static int linux_stopped_by_watchpoint (void); |
95954743 | 145 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
dc146f7c | 146 | static int linux_core_of_thread (ptid_t ptid); |
d50171e4 PA |
147 | static void proceed_all_lwps (void); |
148 | static void unstop_all_lwps (struct lwp_info *except); | |
d50171e4 PA |
149 | static int finish_step_over (struct lwp_info *lwp); |
150 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
151 | static int kill_lwp (unsigned long lwpid, int signo); | |
152 | ||
153 | /* True if the low target can hardware single-step. Such targets | |
154 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
155 | ||
156 | static int | |
157 | can_hardware_single_step (void) | |
158 | { | |
159 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
160 | } | |
161 | ||
162 | /* True if the low target supports memory breakpoints. If so, we'll | |
163 | have a GET_PC implementation. */ | |
164 | ||
165 | static int | |
166 | supports_breakpoints (void) | |
167 | { | |
168 | return (the_low_target.get_pc != NULL); | |
169 | } | |
0d62e5e8 DJ |
170 | |
171 | struct pending_signals | |
172 | { | |
173 | int signal; | |
32ca6d61 | 174 | siginfo_t info; |
0d62e5e8 DJ |
175 | struct pending_signals *prev; |
176 | }; | |
611cb4a5 | 177 | |
14ce3065 DE |
178 | #define PTRACE_ARG3_TYPE void * |
179 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 180 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 181 | |
58caa3dc | 182 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
183 | static char *disabled_regsets; |
184 | static int num_regsets; | |
58caa3dc DJ |
185 | #endif |
186 | ||
bd99dc85 PA |
187 | /* The read/write ends of the pipe registered as waitable file in the |
188 | event loop. */ | |
189 | static int linux_event_pipe[2] = { -1, -1 }; | |
190 | ||
191 | /* True if we're currently in async mode. */ | |
192 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
193 | ||
194 | static void send_sigstop (struct inferior_list_entry *entry); | |
195 | static void wait_for_sigstop (struct inferior_list_entry *entry); | |
196 | ||
d0722149 DE |
197 | /* Accepts an integer PID; Returns a string representing a file that |
198 | can be opened to get info for the child process. | |
199 | Space for the result is malloc'd, caller must free. */ | |
200 | ||
201 | char * | |
202 | linux_child_pid_to_exec_file (int pid) | |
203 | { | |
204 | char *name1, *name2; | |
205 | ||
206 | name1 = xmalloc (MAXPATHLEN); | |
207 | name2 = xmalloc (MAXPATHLEN); | |
208 | memset (name2, 0, MAXPATHLEN); | |
209 | ||
210 | sprintf (name1, "/proc/%d/exe", pid); | |
211 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
212 | { | |
213 | free (name1); | |
214 | return name2; | |
215 | } | |
216 | else | |
217 | { | |
218 | free (name2); | |
219 | return name1; | |
220 | } | |
221 | } | |
222 | ||
223 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
224 | ||
225 | static int | |
957f3f49 | 226 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
227 | { |
228 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
229 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
230 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
231 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
232 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
233 | } | |
234 | ||
235 | /* Return non-zero if FILE is a 64-bit ELF file, | |
236 | zero if the file is not a 64-bit ELF file, | |
237 | and -1 if the file is not accessible or doesn't exist. */ | |
238 | ||
239 | int | |
240 | elf_64_file_p (const char *file) | |
241 | { | |
957f3f49 | 242 | Elf64_Ehdr header; |
d0722149 DE |
243 | int fd; |
244 | ||
245 | fd = open (file, O_RDONLY); | |
246 | if (fd < 0) | |
247 | return -1; | |
248 | ||
249 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
250 | { | |
251 | close (fd); | |
252 | return 0; | |
253 | } | |
254 | close (fd); | |
255 | ||
256 | return elf_64_header_p (&header); | |
257 | } | |
258 | ||
bd99dc85 PA |
259 | static void |
260 | delete_lwp (struct lwp_info *lwp) | |
261 | { | |
262 | remove_thread (get_lwp_thread (lwp)); | |
263 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 264 | free (lwp->arch_private); |
bd99dc85 PA |
265 | free (lwp); |
266 | } | |
267 | ||
95954743 PA |
268 | /* Add a process to the common process list, and set its private |
269 | data. */ | |
270 | ||
271 | static struct process_info * | |
272 | linux_add_process (int pid, int attached) | |
273 | { | |
274 | struct process_info *proc; | |
275 | ||
276 | /* Is this the first process? If so, then set the arch. */ | |
277 | if (all_processes.head == NULL) | |
278 | new_inferior = 1; | |
279 | ||
280 | proc = add_process (pid, attached); | |
281 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
282 | ||
aa5ca48f DE |
283 | if (the_low_target.new_process != NULL) |
284 | proc->private->arch_private = the_low_target.new_process (); | |
285 | ||
95954743 PA |
286 | return proc; |
287 | } | |
288 | ||
5091eb23 DE |
289 | /* Remove a process from the common process list, |
290 | also freeing all private data. */ | |
291 | ||
292 | static void | |
ca5c370d | 293 | linux_remove_process (struct process_info *process) |
5091eb23 | 294 | { |
cdbfd419 PP |
295 | struct process_info_private *priv = process->private; |
296 | ||
cdbfd419 PP |
297 | free (priv->arch_private); |
298 | free (priv); | |
5091eb23 DE |
299 | remove_process (process); |
300 | } | |
301 | ||
07d4f67e DE |
302 | /* Wrapper function for waitpid which handles EINTR, and emulates |
303 | __WALL for systems where that is not available. */ | |
304 | ||
305 | static int | |
306 | my_waitpid (int pid, int *status, int flags) | |
307 | { | |
308 | int ret, out_errno; | |
309 | ||
310 | if (debug_threads) | |
311 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
312 | ||
313 | if (flags & __WALL) | |
314 | { | |
315 | sigset_t block_mask, org_mask, wake_mask; | |
316 | int wnohang; | |
317 | ||
318 | wnohang = (flags & WNOHANG) != 0; | |
319 | flags &= ~(__WALL | __WCLONE); | |
320 | flags |= WNOHANG; | |
321 | ||
322 | /* Block all signals while here. This avoids knowing about | |
323 | LinuxThread's signals. */ | |
324 | sigfillset (&block_mask); | |
325 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
326 | ||
327 | /* ... except during the sigsuspend below. */ | |
328 | sigemptyset (&wake_mask); | |
329 | ||
330 | while (1) | |
331 | { | |
332 | /* Since all signals are blocked, there's no need to check | |
333 | for EINTR here. */ | |
334 | ret = waitpid (pid, status, flags); | |
335 | out_errno = errno; | |
336 | ||
337 | if (ret == -1 && out_errno != ECHILD) | |
338 | break; | |
339 | else if (ret > 0) | |
340 | break; | |
341 | ||
342 | if (flags & __WCLONE) | |
343 | { | |
344 | /* We've tried both flavors now. If WNOHANG is set, | |
345 | there's nothing else to do, just bail out. */ | |
346 | if (wnohang) | |
347 | break; | |
348 | ||
349 | if (debug_threads) | |
350 | fprintf (stderr, "blocking\n"); | |
351 | ||
352 | /* Block waiting for signals. */ | |
353 | sigsuspend (&wake_mask); | |
354 | } | |
355 | ||
356 | flags ^= __WCLONE; | |
357 | } | |
358 | ||
359 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
360 | } | |
361 | else | |
362 | { | |
363 | do | |
364 | ret = waitpid (pid, status, flags); | |
365 | while (ret == -1 && errno == EINTR); | |
366 | out_errno = errno; | |
367 | } | |
368 | ||
369 | if (debug_threads) | |
370 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
371 | pid, flags, status ? *status : -1, ret); | |
372 | ||
373 | errno = out_errno; | |
374 | return ret; | |
375 | } | |
376 | ||
bd99dc85 PA |
377 | /* Handle a GNU/Linux extended wait response. If we see a clone |
378 | event, we need to add the new LWP to our list (and not report the | |
379 | trap to higher layers). */ | |
0d62e5e8 | 380 | |
24a09b5f | 381 | static void |
54a0b537 | 382 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
383 | { |
384 | int event = wstat >> 16; | |
54a0b537 | 385 | struct lwp_info *new_lwp; |
24a09b5f DJ |
386 | |
387 | if (event == PTRACE_EVENT_CLONE) | |
388 | { | |
95954743 | 389 | ptid_t ptid; |
24a09b5f | 390 | unsigned long new_pid; |
836acd6d | 391 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 392 | |
bd99dc85 | 393 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
394 | |
395 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
396 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
397 | { | |
398 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
399 | hits the SIGSTOP, but we're already attached. */ | |
400 | ||
97438e3f | 401 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
402 | |
403 | if (ret == -1) | |
404 | perror_with_name ("waiting for new child"); | |
405 | else if (ret != new_pid) | |
406 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 407 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
408 | warning ("wait returned unexpected status 0x%x", status); |
409 | } | |
410 | ||
14ce3065 | 411 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); |
24a09b5f | 412 | |
95954743 PA |
413 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
414 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
415 | add_thread (ptid, new_lwp); | |
24a09b5f | 416 | |
e27d73f6 DE |
417 | /* Either we're going to immediately resume the new thread |
418 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
419 | thinks the thread is currently running, so set this first | |
420 | before calling linux_resume_one_lwp. */ | |
421 | new_lwp->stopped = 1; | |
422 | ||
da5898ce DJ |
423 | /* Normally we will get the pending SIGSTOP. But in some cases |
424 | we might get another signal delivered to the group first. | |
f21cc1a2 | 425 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
426 | if (WSTOPSIG (status) == SIGSTOP) |
427 | { | |
d50171e4 PA |
428 | if (stopping_threads) |
429 | new_lwp->stop_pc = get_stop_pc (new_lwp); | |
430 | else | |
e27d73f6 | 431 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 432 | } |
24a09b5f | 433 | else |
da5898ce | 434 | { |
54a0b537 | 435 | new_lwp->stop_expected = 1; |
d50171e4 | 436 | |
da5898ce DJ |
437 | if (stopping_threads) |
438 | { | |
d50171e4 | 439 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
440 | new_lwp->status_pending_p = 1; |
441 | new_lwp->status_pending = status; | |
da5898ce DJ |
442 | } |
443 | else | |
444 | /* Pass the signal on. This is what GDB does - except | |
445 | shouldn't we really report it instead? */ | |
e27d73f6 | 446 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 447 | } |
24a09b5f DJ |
448 | |
449 | /* Always resume the current thread. If we are stopping | |
450 | threads, it will have a pending SIGSTOP; we may as well | |
451 | collect it now. */ | |
2acc282a | 452 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
453 | } |
454 | } | |
455 | ||
d50171e4 PA |
456 | /* Return the PC as read from the regcache of LWP, without any |
457 | adjustment. */ | |
458 | ||
459 | static CORE_ADDR | |
460 | get_pc (struct lwp_info *lwp) | |
461 | { | |
462 | struct thread_info *saved_inferior; | |
463 | struct regcache *regcache; | |
464 | CORE_ADDR pc; | |
465 | ||
466 | if (the_low_target.get_pc == NULL) | |
467 | return 0; | |
468 | ||
469 | saved_inferior = current_inferior; | |
470 | current_inferior = get_lwp_thread (lwp); | |
471 | ||
472 | regcache = get_thread_regcache (current_inferior, 1); | |
473 | pc = (*the_low_target.get_pc) (regcache); | |
474 | ||
475 | if (debug_threads) | |
476 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
477 | ||
478 | current_inferior = saved_inferior; | |
479 | return pc; | |
480 | } | |
481 | ||
482 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
483 | The SIGTRAP could mean several things. |
484 | ||
485 | On i386, where decr_pc_after_break is non-zero: | |
486 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
487 | we will get only the one SIGTRAP (even if the instruction we | |
488 | stepped over was a breakpoint). The value of $eip will be the | |
489 | next instruction. | |
490 | If we continue the process using PTRACE_CONT, we will get a | |
491 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
492 | the instruction after the breakpoint (i.e. needs to be | |
493 | decremented). If we report the SIGTRAP to GDB, we must also | |
494 | report the undecremented PC. If we cancel the SIGTRAP, we | |
495 | must resume at the decremented PC. | |
496 | ||
497 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
498 | with hardware or kernel single-step: | |
499 | If we single-step over a breakpoint instruction, our PC will | |
500 | point at the following instruction. If we continue and hit a | |
501 | breakpoint instruction, our PC will point at the breakpoint | |
502 | instruction. */ | |
503 | ||
504 | static CORE_ADDR | |
d50171e4 | 505 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 506 | { |
d50171e4 PA |
507 | CORE_ADDR stop_pc; |
508 | ||
509 | if (the_low_target.get_pc == NULL) | |
510 | return 0; | |
0d62e5e8 | 511 | |
d50171e4 PA |
512 | stop_pc = get_pc (lwp); |
513 | ||
bdabb078 PA |
514 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
515 | && !lwp->stepping | |
516 | && !lwp->stopped_by_watchpoint | |
517 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
518 | stop_pc -= the_low_target.decr_pc_after_break; |
519 | ||
520 | if (debug_threads) | |
521 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
522 | ||
523 | return stop_pc; | |
0d62e5e8 | 524 | } |
ce3a066d | 525 | |
0d62e5e8 | 526 | static void * |
95954743 | 527 | add_lwp (ptid_t ptid) |
611cb4a5 | 528 | { |
54a0b537 | 529 | struct lwp_info *lwp; |
0d62e5e8 | 530 | |
54a0b537 PA |
531 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
532 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 533 | |
95954743 | 534 | lwp->head.id = ptid; |
0d62e5e8 | 535 | |
d50171e4 PA |
536 | lwp->last_resume_kind = resume_continue; |
537 | ||
aa5ca48f DE |
538 | if (the_low_target.new_thread != NULL) |
539 | lwp->arch_private = the_low_target.new_thread (); | |
540 | ||
54a0b537 | 541 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 542 | |
54a0b537 | 543 | return lwp; |
0d62e5e8 | 544 | } |
611cb4a5 | 545 | |
da6d8c04 DJ |
546 | /* Start an inferior process and returns its pid. |
547 | ALLARGS is a vector of program-name and args. */ | |
548 | ||
ce3a066d DJ |
549 | static int |
550 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 551 | { |
a6dbe5df | 552 | struct lwp_info *new_lwp; |
da6d8c04 | 553 | int pid; |
95954743 | 554 | ptid_t ptid; |
da6d8c04 | 555 | |
42c81e2a | 556 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
557 | pid = vfork (); |
558 | #else | |
da6d8c04 | 559 | pid = fork (); |
52fb6437 | 560 | #endif |
da6d8c04 DJ |
561 | if (pid < 0) |
562 | perror_with_name ("fork"); | |
563 | ||
564 | if (pid == 0) | |
565 | { | |
566 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
567 | ||
60c3d7b0 | 568 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 569 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 570 | #endif |
0d62e5e8 | 571 | |
a9fa9f7d DJ |
572 | setpgid (0, 0); |
573 | ||
2b876972 DJ |
574 | execv (program, allargs); |
575 | if (errno == ENOENT) | |
576 | execvp (program, allargs); | |
da6d8c04 DJ |
577 | |
578 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 579 | strerror (errno)); |
da6d8c04 DJ |
580 | fflush (stderr); |
581 | _exit (0177); | |
582 | } | |
583 | ||
95954743 PA |
584 | linux_add_process (pid, 0); |
585 | ||
586 | ptid = ptid_build (pid, pid, 0); | |
587 | new_lwp = add_lwp (ptid); | |
588 | add_thread (ptid, new_lwp); | |
a6dbe5df | 589 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 590 | |
a9fa9f7d | 591 | return pid; |
da6d8c04 DJ |
592 | } |
593 | ||
594 | /* Attach to an inferior process. */ | |
595 | ||
95954743 PA |
596 | static void |
597 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 598 | { |
95954743 | 599 | ptid_t ptid; |
54a0b537 | 600 | struct lwp_info *new_lwp; |
611cb4a5 | 601 | |
95954743 | 602 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 603 | { |
95954743 | 604 | if (!initial) |
2d717e4f DJ |
605 | { |
606 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 607 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
608 | strerror (errno), errno); |
609 | fflush (stderr); | |
610 | return; | |
611 | } | |
612 | else | |
613 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 614 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 615 | strerror (errno), errno); |
da6d8c04 DJ |
616 | } |
617 | ||
95954743 PA |
618 | if (initial) |
619 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
620 | ptid = ptid_build (lwpid, lwpid, 0); | |
621 | else | |
622 | { | |
623 | /* Note that extracting the pid from the current inferior is | |
624 | safe, since we're always called in the context of the same | |
625 | process as this new thread. */ | |
626 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
627 | ptid = ptid_build (pid, lwpid, 0); | |
628 | } | |
24a09b5f | 629 | |
95954743 PA |
630 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
631 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 632 | |
a6dbe5df PA |
633 | /* We need to wait for SIGSTOP before being able to make the next |
634 | ptrace call on this LWP. */ | |
635 | new_lwp->must_set_ptrace_flags = 1; | |
636 | ||
0d62e5e8 | 637 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
638 | brings it to a halt. |
639 | ||
640 | There are several cases to consider here: | |
641 | ||
642 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 643 | of a new thread that is being created. |
d50171e4 PA |
644 | In this case we should ignore that SIGSTOP and resume the |
645 | process. This is handled below by setting stop_expected = 1, | |
646 | and the fact that add_lwp sets last_resume_kind == | |
647 | resume_continue. | |
0e21c1ec DE |
648 | |
649 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
650 | to it via attach_inferior. |
651 | In this case we want the process thread to stop. | |
d50171e4 PA |
652 | This is handled by having linux_attach set last_resume_kind == |
653 | resume_stop after we return. | |
1b3f6016 PA |
654 | ??? If the process already has several threads we leave the other |
655 | threads running. | |
0e21c1ec DE |
656 | |
657 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
658 | existing threads. |
659 | In this case we want the thread to stop. | |
660 | FIXME: This case is currently not properly handled. | |
661 | We should wait for the SIGSTOP but don't. Things work apparently | |
662 | because enough time passes between when we ptrace (ATTACH) and when | |
663 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
664 | |
665 | On the other hand, if we are currently trying to stop all threads, we | |
666 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 667 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
668 | end of the list, and so the new thread has not yet reached |
669 | wait_for_sigstop (but will). */ | |
d50171e4 | 670 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
671 | } |
672 | ||
95954743 PA |
673 | void |
674 | linux_attach_lwp (unsigned long lwpid) | |
675 | { | |
676 | linux_attach_lwp_1 (lwpid, 0); | |
677 | } | |
678 | ||
0d62e5e8 | 679 | int |
a1928bad | 680 | linux_attach (unsigned long pid) |
0d62e5e8 | 681 | { |
54a0b537 | 682 | struct lwp_info *lwp; |
0d62e5e8 | 683 | |
95954743 PA |
684 | linux_attach_lwp_1 (pid, 1); |
685 | ||
686 | linux_add_process (pid, 1); | |
0d62e5e8 | 687 | |
bd99dc85 PA |
688 | if (!non_stop) |
689 | { | |
690 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
691 | process. It will be collected by wait shortly. */ | |
95954743 PA |
692 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
693 | ptid_build (pid, pid, 0)); | |
d50171e4 | 694 | lwp->last_resume_kind = resume_stop; |
bd99dc85 | 695 | } |
0d62e5e8 | 696 | |
95954743 PA |
697 | return 0; |
698 | } | |
699 | ||
700 | struct counter | |
701 | { | |
702 | int pid; | |
703 | int count; | |
704 | }; | |
705 | ||
706 | static int | |
707 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
708 | { | |
709 | struct counter *counter = args; | |
710 | ||
711 | if (ptid_get_pid (entry->id) == counter->pid) | |
712 | { | |
713 | if (++counter->count > 1) | |
714 | return 1; | |
715 | } | |
d61ddec4 | 716 | |
da6d8c04 DJ |
717 | return 0; |
718 | } | |
719 | ||
95954743 PA |
720 | static int |
721 | last_thread_of_process_p (struct thread_info *thread) | |
722 | { | |
723 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
724 | int pid = ptid_get_pid (ptid); | |
725 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 726 | |
95954743 PA |
727 | return (find_inferior (&all_threads, |
728 | second_thread_of_pid_p, &counter) == NULL); | |
729 | } | |
730 | ||
731 | /* Kill the inferior lwp. */ | |
732 | ||
733 | static int | |
734 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 735 | { |
0d62e5e8 | 736 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 737 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 738 | int wstat; |
95954743 PA |
739 | int pid = * (int *) args; |
740 | ||
741 | if (ptid_get_pid (entry->id) != pid) | |
742 | return 0; | |
0d62e5e8 | 743 | |
fd500816 DJ |
744 | /* We avoid killing the first thread here, because of a Linux kernel (at |
745 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
746 | the children get a chance to be reaped, it will remain a zombie | |
747 | forever. */ | |
95954743 | 748 | |
12b42a12 | 749 | if (lwpid_of (lwp) == pid) |
95954743 PA |
750 | { |
751 | if (debug_threads) | |
752 | fprintf (stderr, "lkop: is last of process %s\n", | |
753 | target_pid_to_str (entry->id)); | |
754 | return 0; | |
755 | } | |
fd500816 | 756 | |
bd99dc85 PA |
757 | /* If we're killing a running inferior, make sure it is stopped |
758 | first, as PTRACE_KILL will not work otherwise. */ | |
759 | if (!lwp->stopped) | |
760 | send_sigstop (&lwp->head); | |
761 | ||
0d62e5e8 DJ |
762 | do |
763 | { | |
bd99dc85 | 764 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
765 | |
766 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 767 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 768 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
769 | |
770 | return 0; | |
da6d8c04 DJ |
771 | } |
772 | ||
95954743 PA |
773 | static int |
774 | linux_kill (int pid) | |
0d62e5e8 | 775 | { |
95954743 | 776 | struct process_info *process; |
54a0b537 | 777 | struct lwp_info *lwp; |
95954743 | 778 | struct thread_info *thread; |
fd500816 | 779 | int wstat; |
95954743 | 780 | int lwpid; |
fd500816 | 781 | |
95954743 PA |
782 | process = find_process_pid (pid); |
783 | if (process == NULL) | |
784 | return -1; | |
9d606399 | 785 | |
95954743 | 786 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 787 | |
54a0b537 | 788 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 789 | thread in the list, so do so now. */ |
95954743 PA |
790 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
791 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
792 | |
793 | if (debug_threads) | |
95954743 PA |
794 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
795 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
796 | |
797 | /* If we're killing a running inferior, make sure it is stopped | |
798 | first, as PTRACE_KILL will not work otherwise. */ | |
799 | if (!lwp->stopped) | |
800 | send_sigstop (&lwp->head); | |
801 | ||
fd500816 DJ |
802 | do |
803 | { | |
bd99dc85 | 804 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
805 | |
806 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
807 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
808 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 809 | |
ca5c370d PA |
810 | #ifdef USE_THREAD_DB |
811 | thread_db_free (process, 0); | |
812 | #endif | |
bd99dc85 | 813 | delete_lwp (lwp); |
ca5c370d | 814 | linux_remove_process (process); |
95954743 | 815 | return 0; |
0d62e5e8 DJ |
816 | } |
817 | ||
95954743 PA |
818 | static int |
819 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
820 | { |
821 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 822 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
823 | int pid = * (int *) args; |
824 | ||
825 | if (ptid_get_pid (entry->id) != pid) | |
826 | return 0; | |
6ad8ae5c | 827 | |
bd99dc85 PA |
828 | /* If we're detaching from a running inferior, make sure it is |
829 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
830 | if (!lwp->stopped) | |
831 | { | |
95954743 | 832 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
833 | |
834 | stopping_threads = 1; | |
835 | send_sigstop (&lwp->head); | |
836 | ||
837 | /* If this detects a new thread through a clone event, the new | |
838 | thread is appended to the end of the lwp list, so we'll | |
839 | eventually detach from it. */ | |
840 | wait_for_sigstop (&lwp->head); | |
841 | stopping_threads = 0; | |
842 | ||
843 | /* If LWP exits while we're trying to stop it, there's nothing | |
844 | left to do. */ | |
95954743 | 845 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 846 | if (lwp == NULL) |
95954743 | 847 | return 0; |
bd99dc85 PA |
848 | } |
849 | ||
ae13219e DJ |
850 | /* If this process is stopped but is expecting a SIGSTOP, then make |
851 | sure we take care of that now. This isn't absolutely guaranteed | |
852 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 853 | if (lwp->stop_expected) |
ae13219e | 854 | { |
bd99dc85 | 855 | int wstat; |
ae13219e | 856 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
857 | lwp->stop_expected = 0; |
858 | if (lwp->stopped) | |
2acc282a | 859 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 860 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
861 | } |
862 | ||
863 | /* Flush any pending changes to the process's registers. */ | |
864 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 865 | get_lwp_thread (lwp)); |
ae13219e DJ |
866 | |
867 | /* Finally, let it resume. */ | |
bd99dc85 PA |
868 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
869 | ||
870 | delete_lwp (lwp); | |
95954743 | 871 | return 0; |
6ad8ae5c DJ |
872 | } |
873 | ||
dd6953e1 | 874 | static int |
95954743 | 875 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 876 | { |
95954743 PA |
877 | int *pid_p = args; |
878 | ||
879 | if (ptid_get_pid (entry->id) == *pid_p) | |
880 | return 1; | |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
885 | static int | |
886 | linux_detach (int pid) | |
887 | { | |
888 | struct process_info *process; | |
889 | ||
890 | process = find_process_pid (pid); | |
891 | if (process == NULL) | |
892 | return -1; | |
893 | ||
ca5c370d PA |
894 | #ifdef USE_THREAD_DB |
895 | thread_db_free (process, 1); | |
896 | #endif | |
897 | ||
95954743 PA |
898 | current_inferior = |
899 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
900 | ||
ae13219e | 901 | delete_all_breakpoints (); |
95954743 | 902 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
ca5c370d | 903 | linux_remove_process (process); |
dd6953e1 | 904 | return 0; |
6ad8ae5c DJ |
905 | } |
906 | ||
444d6139 | 907 | static void |
95954743 | 908 | linux_join (int pid) |
444d6139 | 909 | { |
444d6139 | 910 | int status, ret; |
95954743 | 911 | struct process_info *process; |
bd99dc85 | 912 | |
95954743 PA |
913 | process = find_process_pid (pid); |
914 | if (process == NULL) | |
915 | return; | |
444d6139 PA |
916 | |
917 | do { | |
95954743 | 918 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
919 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
920 | break; | |
921 | } while (ret != -1 || errno != ECHILD); | |
922 | } | |
923 | ||
6ad8ae5c | 924 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 925 | static int |
95954743 | 926 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 927 | { |
95954743 PA |
928 | struct lwp_info *lwp = find_lwp_pid (ptid); |
929 | ||
930 | /* We assume we always know if a thread exits. If a whole process | |
931 | exited but we still haven't been able to report it to GDB, we'll | |
932 | hold on to the last lwp of the dead process. */ | |
933 | if (lwp != NULL) | |
934 | return !lwp->dead; | |
0d62e5e8 DJ |
935 | else |
936 | return 0; | |
937 | } | |
938 | ||
6bf5e0ba | 939 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 940 | static int |
d50171e4 | 941 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 942 | { |
54a0b537 | 943 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 944 | ptid_t ptid = * (ptid_t *) arg; |
d50171e4 | 945 | struct thread_info *thread = get_lwp_thread (lwp); |
95954743 PA |
946 | |
947 | /* Check if we're only interested in events from a specific process | |
948 | or its lwps. */ | |
949 | if (!ptid_equal (minus_one_ptid, ptid) | |
950 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
951 | return 0; | |
0d62e5e8 | 952 | |
d50171e4 PA |
953 | thread = get_lwp_thread (lwp); |
954 | ||
955 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
956 | report any status pending the LWP may have. */ | |
957 | if (lwp->last_resume_kind == resume_stop | |
958 | && thread->last_status.kind == TARGET_WAITKIND_STOPPED) | |
959 | return 0; | |
0d62e5e8 | 960 | |
d50171e4 | 961 | return lwp->status_pending_p; |
0d62e5e8 DJ |
962 | } |
963 | ||
95954743 PA |
964 | static int |
965 | same_lwp (struct inferior_list_entry *entry, void *data) | |
966 | { | |
967 | ptid_t ptid = *(ptid_t *) data; | |
968 | int lwp; | |
969 | ||
970 | if (ptid_get_lwp (ptid) != 0) | |
971 | lwp = ptid_get_lwp (ptid); | |
972 | else | |
973 | lwp = ptid_get_pid (ptid); | |
974 | ||
975 | if (ptid_get_lwp (entry->id) == lwp) | |
976 | return 1; | |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
981 | struct lwp_info * | |
982 | find_lwp_pid (ptid_t ptid) | |
983 | { | |
984 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
985 | } | |
986 | ||
bd99dc85 | 987 | static struct lwp_info * |
95954743 | 988 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 989 | { |
0d62e5e8 | 990 | int ret; |
95954743 | 991 | int to_wait_for = -1; |
bd99dc85 | 992 | struct lwp_info *child = NULL; |
0d62e5e8 | 993 | |
bd99dc85 | 994 | if (debug_threads) |
95954743 PA |
995 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
996 | ||
997 | if (ptid_equal (ptid, minus_one_ptid)) | |
998 | to_wait_for = -1; /* any child */ | |
999 | else | |
1000 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1001 | |
bd99dc85 | 1002 | options |= __WALL; |
0d62e5e8 | 1003 | |
bd99dc85 | 1004 | retry: |
0d62e5e8 | 1005 | |
bd99dc85 PA |
1006 | ret = my_waitpid (to_wait_for, wstatp, options); |
1007 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1008 | return NULL; | |
1009 | else if (ret == -1) | |
1010 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1011 | |
1012 | if (debug_threads | |
1013 | && (!WIFSTOPPED (*wstatp) | |
1014 | || (WSTOPSIG (*wstatp) != 32 | |
1015 | && WSTOPSIG (*wstatp) != 33))) | |
1016 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1017 | ||
95954743 | 1018 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1019 | |
24a09b5f DJ |
1020 | /* If we didn't find a process, one of two things presumably happened: |
1021 | - A process we started and then detached from has exited. Ignore it. | |
1022 | - A process we are controlling has forked and the new child's stop | |
1023 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1024 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1025 | { |
1026 | add_pid_to_list (&stopped_pids, ret); | |
1027 | goto retry; | |
1028 | } | |
bd99dc85 | 1029 | else if (child == NULL) |
24a09b5f DJ |
1030 | goto retry; |
1031 | ||
bd99dc85 | 1032 | child->stopped = 1; |
0d62e5e8 | 1033 | |
bd99dc85 | 1034 | child->last_status = *wstatp; |
32ca6d61 | 1035 | |
d61ddec4 UW |
1036 | /* Architecture-specific setup after inferior is running. |
1037 | This needs to happen after we have attached to the inferior | |
1038 | and it is stopped for the first time, but before we access | |
1039 | any inferior registers. */ | |
1040 | if (new_inferior) | |
1041 | { | |
1042 | the_low_target.arch_setup (); | |
52fa2412 UW |
1043 | #ifdef HAVE_LINUX_REGSETS |
1044 | memset (disabled_regsets, 0, num_regsets); | |
1045 | #endif | |
d61ddec4 UW |
1046 | new_inferior = 0; |
1047 | } | |
1048 | ||
c3adc08c PA |
1049 | /* Fetch the possibly triggered data watchpoint info and store it in |
1050 | CHILD. | |
1051 | ||
1052 | On some archs, like x86, that use debug registers to set | |
1053 | watchpoints, it's possible that the way to know which watched | |
1054 | address trapped, is to check the register that is used to select | |
1055 | which address to watch. Problem is, between setting the | |
1056 | watchpoint and reading back which data address trapped, the user | |
1057 | may change the set of watchpoints, and, as a consequence, GDB | |
1058 | changes the debug registers in the inferior. To avoid reading | |
1059 | back a stale stopped-data-address when that happens, we cache in | |
1060 | LP the fact that a watchpoint trapped, and the corresponding data | |
1061 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1062 | changes the debug registers meanwhile, we have the cached data we | |
1063 | can rely on. */ | |
1064 | ||
1065 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1066 | { | |
1067 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1068 | { | |
1069 | child->stopped_by_watchpoint = 0; | |
1070 | } | |
1071 | else | |
1072 | { | |
1073 | struct thread_info *saved_inferior; | |
1074 | ||
1075 | saved_inferior = current_inferior; | |
1076 | current_inferior = get_lwp_thread (child); | |
1077 | ||
1078 | child->stopped_by_watchpoint | |
1079 | = the_low_target.stopped_by_watchpoint (); | |
1080 | ||
1081 | if (child->stopped_by_watchpoint) | |
1082 | { | |
1083 | if (the_low_target.stopped_data_address != NULL) | |
1084 | child->stopped_data_address | |
1085 | = the_low_target.stopped_data_address (); | |
1086 | else | |
1087 | child->stopped_data_address = 0; | |
1088 | } | |
1089 | ||
1090 | current_inferior = saved_inferior; | |
1091 | } | |
1092 | } | |
1093 | ||
d50171e4 PA |
1094 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1095 | architecture being defined already (so that CHILD has a valid | |
1096 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1097 | not). */ | |
1098 | if (WIFSTOPPED (*wstatp)) | |
1099 | child->stop_pc = get_stop_pc (child); | |
1100 | ||
0d62e5e8 | 1101 | if (debug_threads |
47c0c975 DE |
1102 | && WIFSTOPPED (*wstatp) |
1103 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1104 | { |
896c7fbb | 1105 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1106 | struct regcache *regcache; |
47c0c975 DE |
1107 | CORE_ADDR pc; |
1108 | ||
d50171e4 | 1109 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1110 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1111 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1112 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1113 | current_inferior = saved_inferior; |
0d62e5e8 | 1114 | } |
bd99dc85 PA |
1115 | |
1116 | return child; | |
0d62e5e8 | 1117 | } |
611cb4a5 | 1118 | |
d50171e4 PA |
1119 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1120 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1121 | will handle the current event, eventually we will resume this LWP, | |
1122 | and this breakpoint will trap again. */ | |
1123 | ||
1124 | static int | |
1125 | cancel_breakpoint (struct lwp_info *lwp) | |
1126 | { | |
1127 | struct thread_info *saved_inferior; | |
1128 | struct regcache *regcache; | |
1129 | ||
1130 | /* There's nothing to do if we don't support breakpoints. */ | |
1131 | if (!supports_breakpoints ()) | |
1132 | return 0; | |
1133 | ||
d50171e4 PA |
1134 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); |
1135 | ||
1136 | /* breakpoint_at reads from current inferior. */ | |
1137 | saved_inferior = current_inferior; | |
1138 | current_inferior = get_lwp_thread (lwp); | |
1139 | ||
1140 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1141 | { | |
1142 | if (debug_threads) | |
1143 | fprintf (stderr, | |
1144 | "CB: Push back breakpoint for %s\n", | |
1145 | target_pid_to_str (lwp->head.id)); | |
1146 | ||
1147 | /* Back up the PC if necessary. */ | |
1148 | if (the_low_target.decr_pc_after_break) | |
1149 | { | |
1150 | struct regcache *regcache | |
1151 | = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1152 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); | |
1153 | } | |
1154 | ||
1155 | current_inferior = saved_inferior; | |
1156 | return 1; | |
1157 | } | |
1158 | else | |
1159 | { | |
1160 | if (debug_threads) | |
1161 | fprintf (stderr, | |
1162 | "CB: No breakpoint found at %s for [%s]\n", | |
1163 | paddress (lwp->stop_pc), | |
1164 | target_pid_to_str (lwp->head.id)); | |
1165 | } | |
1166 | ||
1167 | current_inferior = saved_inferior; | |
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | /* When the event-loop is doing a step-over, this points at the thread | |
1172 | being stepped. */ | |
1173 | ptid_t step_over_bkpt; | |
1174 | ||
bd99dc85 PA |
1175 | /* Wait for an event from child PID. If PID is -1, wait for any |
1176 | child. Store the stop status through the status pointer WSTAT. | |
1177 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1178 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1179 | the stopped child otherwise. */ | |
1180 | ||
0d62e5e8 | 1181 | static int |
95954743 | 1182 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1183 | { |
d50171e4 PA |
1184 | struct lwp_info *event_child, *requested_child; |
1185 | ||
d50171e4 PA |
1186 | event_child = NULL; |
1187 | requested_child = NULL; | |
0d62e5e8 | 1188 | |
95954743 | 1189 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1190 | |
95954743 PA |
1191 | if (ptid_equal (ptid, minus_one_ptid) |
1192 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1193 | { |
54a0b537 | 1194 | event_child = (struct lwp_info *) |
d50171e4 | 1195 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1196 | if (debug_threads && event_child) |
bd99dc85 | 1197 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1198 | } |
1199 | else | |
1200 | { | |
95954743 | 1201 | requested_child = find_lwp_pid (ptid); |
d50171e4 PA |
1202 | |
1203 | if (requested_child->status_pending_p) | |
bd99dc85 | 1204 | event_child = requested_child; |
0d62e5e8 | 1205 | } |
611cb4a5 | 1206 | |
0d62e5e8 DJ |
1207 | if (event_child != NULL) |
1208 | { | |
bd99dc85 PA |
1209 | if (debug_threads) |
1210 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1211 | lwpid_of (event_child), event_child->status_pending); | |
1212 | *wstat = event_child->status_pending; | |
1213 | event_child->status_pending_p = 0; | |
1214 | event_child->status_pending = 0; | |
1215 | current_inferior = get_lwp_thread (event_child); | |
1216 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1217 | } |
1218 | ||
1219 | /* We only enter this loop if no process has a pending wait status. Thus | |
1220 | any action taken in response to a wait status inside this loop is | |
1221 | responding as soon as we detect the status, not after any pending | |
1222 | events. */ | |
1223 | while (1) | |
1224 | { | |
6bf5e0ba | 1225 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1226 | |
bd99dc85 | 1227 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1228 | { |
1229 | if (debug_threads) | |
1230 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1231 | return 0; | |
1232 | } | |
0d62e5e8 DJ |
1233 | |
1234 | if (event_child == NULL) | |
1235 | error ("event from unknown child"); | |
611cb4a5 | 1236 | |
bd99dc85 | 1237 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1238 | |
89be2091 | 1239 | /* Check for thread exit. */ |
bd99dc85 | 1240 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1241 | { |
89be2091 | 1242 | if (debug_threads) |
95954743 | 1243 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1244 | |
1245 | /* If the last thread is exiting, just return. */ | |
95954743 | 1246 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1247 | { |
1248 | if (debug_threads) | |
95954743 PA |
1249 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1250 | lwpid_of (event_child)); | |
bd99dc85 PA |
1251 | return lwpid_of (event_child); |
1252 | } | |
89be2091 | 1253 | |
bd99dc85 PA |
1254 | if (!non_stop) |
1255 | { | |
1256 | current_inferior = (struct thread_info *) all_threads.head; | |
1257 | if (debug_threads) | |
1258 | fprintf (stderr, "Current inferior is now %ld\n", | |
1259 | lwpid_of (get_thread_lwp (current_inferior))); | |
1260 | } | |
1261 | else | |
1262 | { | |
1263 | current_inferior = NULL; | |
1264 | if (debug_threads) | |
1265 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1266 | } | |
89be2091 DJ |
1267 | |
1268 | /* If we were waiting for this particular child to do something... | |
1269 | well, it did something. */ | |
bd99dc85 | 1270 | if (requested_child != NULL) |
d50171e4 PA |
1271 | { |
1272 | int lwpid = lwpid_of (event_child); | |
1273 | ||
1274 | /* Cancel the step-over operation --- the thread that | |
1275 | started it is gone. */ | |
1276 | if (finish_step_over (event_child)) | |
1277 | unstop_all_lwps (event_child); | |
1278 | delete_lwp (event_child); | |
1279 | return lwpid; | |
1280 | } | |
1281 | ||
1282 | delete_lwp (event_child); | |
89be2091 DJ |
1283 | |
1284 | /* Wait for a more interesting event. */ | |
1285 | continue; | |
1286 | } | |
1287 | ||
a6dbe5df PA |
1288 | if (event_child->must_set_ptrace_flags) |
1289 | { | |
1290 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
14ce3065 | 1291 | 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); |
a6dbe5df PA |
1292 | event_child->must_set_ptrace_flags = 0; |
1293 | } | |
1294 | ||
bd99dc85 PA |
1295 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1296 | && *wstat >> 16 != 0) | |
24a09b5f | 1297 | { |
bd99dc85 | 1298 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1299 | continue; |
1300 | } | |
1301 | ||
89be2091 DJ |
1302 | /* If GDB is not interested in this signal, don't stop other |
1303 | threads, and don't report it to GDB. Just resume the | |
1304 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1305 | signals as well as any that GDB specifically requested we |
1306 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1307 | and do not ignore signals when stepping - they may require | |
1308 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1309 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1310 | thread library? */ | |
bd99dc85 | 1311 | if (WIFSTOPPED (*wstat) |
69f223ed | 1312 | && !event_child->stepping |
24a09b5f | 1313 | && ( |
60c3d7b0 | 1314 | #if defined (USE_THREAD_DB) && defined (__SIGRTMIN) |
cdbfd419 | 1315 | (current_process ()->private->thread_db != NULL |
bd99dc85 PA |
1316 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1317 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1318 | || |
1319 | #endif | |
bd99dc85 | 1320 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
d50171e4 PA |
1321 | && !(WSTOPSIG (*wstat) == SIGSTOP |
1322 | && event_child->stop_expected)))) | |
89be2091 DJ |
1323 | { |
1324 | siginfo_t info, *info_p; | |
1325 | ||
1326 | if (debug_threads) | |
24a09b5f | 1327 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1328 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1329 | |
bd99dc85 | 1330 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1331 | info_p = &info; |
1332 | else | |
1333 | info_p = NULL; | |
d50171e4 | 1334 | linux_resume_one_lwp (event_child, event_child->stepping, |
bd99dc85 | 1335 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1336 | continue; |
0d62e5e8 | 1337 | } |
611cb4a5 | 1338 | |
d50171e4 PA |
1339 | if (WIFSTOPPED (*wstat) |
1340 | && WSTOPSIG (*wstat) == SIGSTOP | |
1341 | && event_child->stop_expected) | |
1342 | { | |
1343 | int should_stop; | |
1344 | ||
1345 | if (debug_threads) | |
1346 | fprintf (stderr, "Expected stop.\n"); | |
1347 | event_child->stop_expected = 0; | |
1348 | ||
1349 | should_stop = (event_child->last_resume_kind == resume_stop | |
1350 | || stopping_threads); | |
1351 | ||
1352 | if (!should_stop) | |
1353 | { | |
1354 | linux_resume_one_lwp (event_child, | |
1355 | event_child->stepping, 0, NULL); | |
1356 | continue; | |
1357 | } | |
1358 | } | |
1359 | ||
bd99dc85 | 1360 | return lwpid_of (event_child); |
611cb4a5 | 1361 | } |
0d62e5e8 | 1362 | |
611cb4a5 DJ |
1363 | /* NOTREACHED */ |
1364 | return 0; | |
1365 | } | |
1366 | ||
95954743 PA |
1367 | static int |
1368 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1369 | { | |
1370 | ptid_t wait_ptid; | |
1371 | ||
1372 | if (ptid_is_pid (ptid)) | |
1373 | { | |
1374 | /* A request to wait for a specific tgid. This is not possible | |
1375 | with waitpid, so instead, we wait for any child, and leave | |
1376 | children we're not interested in right now with a pending | |
1377 | status to report later. */ | |
1378 | wait_ptid = minus_one_ptid; | |
1379 | } | |
1380 | else | |
1381 | wait_ptid = ptid; | |
1382 | ||
1383 | while (1) | |
1384 | { | |
1385 | int event_pid; | |
1386 | ||
1387 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1388 | ||
1389 | if (event_pid > 0 | |
1390 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1391 | { | |
1392 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1393 | ||
1394 | if (! WIFSTOPPED (*wstat)) | |
1395 | mark_lwp_dead (event_child, *wstat); | |
1396 | else | |
1397 | { | |
1398 | event_child->status_pending_p = 1; | |
1399 | event_child->status_pending = *wstat; | |
1400 | } | |
1401 | } | |
1402 | else | |
1403 | return event_pid; | |
1404 | } | |
1405 | } | |
1406 | ||
6bf5e0ba PA |
1407 | |
1408 | /* Count the LWP's that have had events. */ | |
1409 | ||
1410 | static int | |
1411 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1412 | { | |
1413 | struct lwp_info *lp = (struct lwp_info *) entry; | |
1414 | int *count = data; | |
1415 | ||
1416 | gdb_assert (count != NULL); | |
1417 | ||
1418 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1419 | should be reported to GDB. */ | |
1420 | if (get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE | |
1421 | && lp->last_resume_kind != resume_stop | |
1422 | && lp->status_pending_p | |
1423 | && WIFSTOPPED (lp->status_pending) | |
1424 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1425 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1426 | (*count)++; | |
1427 | ||
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1432 | ||
1433 | static int | |
1434 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1435 | { | |
1436 | struct lwp_info *lp = (struct lwp_info *) entry; | |
1437 | ||
1438 | if (get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE | |
1439 | && lp->last_resume_kind == resume_step | |
1440 | && lp->status_pending_p) | |
1441 | return 1; | |
1442 | else | |
1443 | return 0; | |
1444 | } | |
1445 | ||
1446 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1447 | reported to GDB. */ | |
1448 | ||
1449 | static int | |
1450 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1451 | { | |
1452 | struct lwp_info *lp = (struct lwp_info *) entry; | |
1453 | int *selector = data; | |
1454 | ||
1455 | gdb_assert (selector != NULL); | |
1456 | ||
1457 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
1458 | if (lp->last_resume_kind != resume_stop | |
1459 | && get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE | |
1460 | && lp->status_pending_p | |
1461 | && WIFSTOPPED (lp->status_pending) | |
1462 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1463 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1464 | if ((*selector)-- == 0) | |
1465 | return 1; | |
1466 | ||
1467 | return 0; | |
1468 | } | |
1469 | ||
1470 | static int | |
1471 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
1472 | { | |
1473 | struct lwp_info *lp = (struct lwp_info *) entry; | |
1474 | struct lwp_info *event_lp = data; | |
1475 | ||
1476 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1477 | if (lp == event_lp) | |
1478 | return 0; | |
1479 | ||
1480 | /* If a LWP other than the LWP that we're reporting an event for has | |
1481 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1482 | then just arrange for it to hit it again later. We don't keep | |
1483 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1484 | LWP. We will handle the current event, eventually we will resume | |
1485 | all LWPs, and this one will get its breakpoint trap again. | |
1486 | ||
1487 | If we do not do this, then we run the risk that the user will | |
1488 | delete or disable the breakpoint, but the LWP will have already | |
1489 | tripped on it. */ | |
1490 | ||
1491 | if (lp->last_resume_kind != resume_stop | |
1492 | && get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE | |
1493 | && lp->status_pending_p | |
1494 | && WIFSTOPPED (lp->status_pending) | |
1495 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
1496 | && !lp->stepping |
1497 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
1498 | && cancel_breakpoint (lp)) |
1499 | /* Throw away the SIGTRAP. */ | |
1500 | lp->status_pending_p = 0; | |
1501 | ||
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | /* Select one LWP out of those that have events pending. */ | |
1506 | ||
1507 | static void | |
1508 | select_event_lwp (struct lwp_info **orig_lp) | |
1509 | { | |
1510 | int num_events = 0; | |
1511 | int random_selector; | |
1512 | struct lwp_info *event_lp; | |
1513 | ||
1514 | /* Give preference to any LWP that is being single-stepped. */ | |
1515 | event_lp | |
1516 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1517 | select_singlestep_lwp_callback, NULL); | |
1518 | if (event_lp != NULL) | |
1519 | { | |
1520 | if (debug_threads) | |
1521 | fprintf (stderr, | |
1522 | "SEL: Select single-step %s\n", | |
1523 | target_pid_to_str (ptid_of (event_lp))); | |
1524 | } | |
1525 | else | |
1526 | { | |
1527 | /* No single-stepping LWP. Select one at random, out of those | |
1528 | which have had SIGTRAP events. */ | |
1529 | ||
1530 | /* First see how many SIGTRAP events we have. */ | |
1531 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
1532 | ||
1533 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1534 | random_selector = (int) | |
1535 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1536 | ||
1537 | if (debug_threads && num_events > 1) | |
1538 | fprintf (stderr, | |
1539 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1540 | num_events, random_selector); | |
1541 | ||
1542 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
1543 | select_event_lwp_callback, | |
1544 | &random_selector); | |
1545 | } | |
1546 | ||
1547 | if (event_lp != NULL) | |
1548 | { | |
1549 | /* Switch the event LWP. */ | |
1550 | *orig_lp = event_lp; | |
1551 | } | |
1552 | } | |
1553 | ||
d50171e4 PA |
1554 | /* Set this inferior LWP's state as "want-stopped". We won't resume |
1555 | this LWP until the client gives us another action for it. */ | |
1556 | ||
1557 | static void | |
1558 | gdb_wants_lwp_stopped (struct inferior_list_entry *entry) | |
1559 | { | |
1560 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1561 | struct thread_info *thread = get_lwp_thread (lwp); | |
1562 | ||
1563 | /* Most threads are stopped implicitly (all-stop); tag that with | |
1564 | signal 0. The thread being explicitly reported stopped to the | |
1565 | client, gets it's status fixed up afterwards. */ | |
1566 | thread->last_status.kind = TARGET_WAITKIND_STOPPED; | |
1567 | thread->last_status.value.sig = TARGET_SIGNAL_0; | |
1568 | ||
1569 | lwp->last_resume_kind = resume_stop; | |
1570 | } | |
1571 | ||
1572 | /* Set all LWP's states as "want-stopped". */ | |
1573 | ||
1574 | static void | |
1575 | gdb_wants_all_stopped (void) | |
1576 | { | |
1577 | for_each_inferior (&all_lwps, gdb_wants_lwp_stopped); | |
1578 | } | |
1579 | ||
0d62e5e8 | 1580 | /* Wait for process, returns status. */ |
da6d8c04 | 1581 | |
95954743 PA |
1582 | static ptid_t |
1583 | linux_wait_1 (ptid_t ptid, | |
1584 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1585 | { |
e5f1222d | 1586 | int w; |
bd99dc85 | 1587 | struct thread_info *thread = NULL; |
6bf5e0ba | 1588 | struct lwp_info *event_child = NULL; |
bd99dc85 | 1589 | int options; |
bd99dc85 | 1590 | int pid; |
6bf5e0ba PA |
1591 | int step_over_finished; |
1592 | int bp_explains_trap; | |
1593 | int maybe_internal_trap; | |
1594 | int report_to_gdb; | |
bd99dc85 PA |
1595 | |
1596 | /* Translate generic target options into linux options. */ | |
1597 | options = __WALL; | |
1598 | if (target_options & TARGET_WNOHANG) | |
1599 | options |= WNOHANG; | |
0d62e5e8 DJ |
1600 | |
1601 | retry: | |
bd99dc85 PA |
1602 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1603 | ||
0d62e5e8 DJ |
1604 | /* If we were only supposed to resume one thread, only wait for |
1605 | that thread - if it's still alive. If it died, however - which | |
1606 | can happen if we're coming from the thread death case below - | |
1607 | then we need to make sure we restart the other threads. We could | |
1608 | pick a thread at random or restart all; restarting all is less | |
1609 | arbitrary. */ | |
95954743 PA |
1610 | if (!non_stop |
1611 | && !ptid_equal (cont_thread, null_ptid) | |
1612 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1613 | { |
bd99dc85 PA |
1614 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1615 | cont_thread); | |
0d62e5e8 DJ |
1616 | |
1617 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1618 | if (thread == NULL) |
64386c31 DJ |
1619 | { |
1620 | struct thread_resume resume_info; | |
95954743 | 1621 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1622 | resume_info.kind = resume_continue; |
1623 | resume_info.sig = 0; | |
2bd7c093 | 1624 | linux_resume (&resume_info, 1); |
64386c31 | 1625 | } |
bd99dc85 | 1626 | else |
95954743 | 1627 | ptid = cont_thread; |
0d62e5e8 | 1628 | } |
da6d8c04 | 1629 | |
6bf5e0ba PA |
1630 | if (ptid_equal (step_over_bkpt, null_ptid)) |
1631 | pid = linux_wait_for_event (ptid, &w, options); | |
1632 | else | |
1633 | { | |
1634 | if (debug_threads) | |
1635 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
1636 | target_pid_to_str (step_over_bkpt)); | |
1637 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
1638 | } | |
1639 | ||
bd99dc85 | 1640 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1641 | return null_ptid; |
bd99dc85 | 1642 | |
6bf5e0ba | 1643 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 1644 | |
0d62e5e8 DJ |
1645 | /* If we are waiting for a particular child, and it exited, |
1646 | linux_wait_for_event will return its exit status. Similarly if | |
1647 | the last child exited. If this is not the last child, however, | |
1648 | do not report it as exited until there is a 'thread exited' response | |
1649 | available in the remote protocol. Instead, just wait for another event. | |
1650 | This should be safe, because if the thread crashed we will already | |
1651 | have reported the termination signal to GDB; that should stop any | |
1652 | in-progress stepping operations, etc. | |
1653 | ||
1654 | Report the exit status of the last thread to exit. This matches | |
1655 | LinuxThreads' behavior. */ | |
1656 | ||
95954743 | 1657 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1658 | { |
bd99dc85 | 1659 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1660 | { |
6bf5e0ba | 1661 | int pid = pid_of (event_child); |
95954743 | 1662 | struct process_info *process = find_process_pid (pid); |
5b1c542e | 1663 | |
ca5c370d PA |
1664 | #ifdef USE_THREAD_DB |
1665 | thread_db_free (process, 0); | |
1666 | #endif | |
6bf5e0ba | 1667 | delete_lwp (event_child); |
ca5c370d | 1668 | linux_remove_process (process); |
5b1c542e | 1669 | |
bd99dc85 | 1670 | current_inferior = NULL; |
5b1c542e | 1671 | |
bd99dc85 PA |
1672 | if (WIFEXITED (w)) |
1673 | { | |
1674 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1675 | ourstatus->value.integer = WEXITSTATUS (w); | |
1676 | ||
1677 | if (debug_threads) | |
1678 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1679 | } | |
1680 | else | |
1681 | { | |
1682 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1683 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1684 | ||
1685 | if (debug_threads) | |
1686 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1687 | ||
1688 | } | |
5b1c542e | 1689 | |
95954743 | 1690 | return pid_to_ptid (pid); |
0d62e5e8 | 1691 | } |
da6d8c04 | 1692 | } |
0d62e5e8 | 1693 | else |
da6d8c04 | 1694 | { |
0d62e5e8 DJ |
1695 | if (!WIFSTOPPED (w)) |
1696 | goto retry; | |
da6d8c04 DJ |
1697 | } |
1698 | ||
6bf5e0ba PA |
1699 | /* If this event was not handled before, and is not a SIGTRAP, we |
1700 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
1701 | a breakpoint is inserted at the current PC. If this target does | |
1702 | not support internal breakpoints at all, we also report the | |
1703 | SIGTRAP without further processing; it's of no concern to us. */ | |
1704 | maybe_internal_trap | |
1705 | = (supports_breakpoints () | |
1706 | && (WSTOPSIG (w) == SIGTRAP | |
1707 | || ((WSTOPSIG (w) == SIGILL | |
1708 | || WSTOPSIG (w) == SIGSEGV) | |
1709 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
1710 | ||
1711 | if (maybe_internal_trap) | |
1712 | { | |
1713 | /* Handle anything that requires bookkeeping before deciding to | |
1714 | report the event or continue waiting. */ | |
1715 | ||
1716 | /* First check if we can explain the SIGTRAP with an internal | |
1717 | breakpoint, or if we should possibly report the event to GDB. | |
1718 | Do this before anything that may remove or insert a | |
1719 | breakpoint. */ | |
1720 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
1721 | ||
1722 | /* We have a SIGTRAP, possibly a step-over dance has just | |
1723 | finished. If so, tweak the state machine accordingly, | |
1724 | reinsert breakpoints and delete any reinsert (software | |
1725 | single-step) breakpoints. */ | |
1726 | step_over_finished = finish_step_over (event_child); | |
1727 | ||
1728 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
1729 | check_breakpoints (event_child->stop_pc); | |
1730 | ||
1731 | if (bp_explains_trap) | |
1732 | { | |
1733 | /* If we stepped or ran into an internal breakpoint, we've | |
1734 | already handled it. So next time we resume (from this | |
1735 | PC), we should step over it. */ | |
1736 | if (debug_threads) | |
1737 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1738 | ||
8b07ae33 PA |
1739 | if (breakpoint_here (event_child->stop_pc)) |
1740 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
1741 | } |
1742 | } | |
1743 | else | |
1744 | { | |
1745 | /* We have some other signal, possibly a step-over dance was in | |
1746 | progress, and it should be cancelled too. */ | |
1747 | step_over_finished = finish_step_over (event_child); | |
1748 | } | |
1749 | ||
1750 | /* We have all the data we need. Either report the event to GDB, or | |
1751 | resume threads and keep waiting for more. */ | |
1752 | ||
1753 | /* Check If GDB would be interested in this event. If GDB wanted | |
1754 | this thread to single step, we always want to report the SIGTRAP, | |
8b07ae33 PA |
1755 | and let GDB handle it. Watchpoints should always be reported. |
1756 | So should signals we can't explain. A SIGTRAP we can't explain | |
1757 | could be a GDB breakpoint --- we may or not support Z0 | |
1758 | breakpoints. If we do, we're be able to handle GDB breakpoints | |
1759 | on top of internal breakpoints, by handling the internal | |
1760 | breakpoint and still reporting the event to GDB. If we don't, | |
1761 | we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba PA |
1762 | report_to_gdb = (!maybe_internal_trap |
1763 | || event_child->last_resume_kind == resume_step | |
1764 | || event_child->stopped_by_watchpoint | |
8b07ae33 PA |
1765 | || (!step_over_finished && !bp_explains_trap) |
1766 | || gdb_breakpoint_here (event_child->stop_pc)); | |
6bf5e0ba PA |
1767 | |
1768 | /* We found no reason GDB would want us to stop. We either hit one | |
1769 | of our own breakpoints, or finished an internal step GDB | |
1770 | shouldn't know about. */ | |
1771 | if (!report_to_gdb) | |
1772 | { | |
1773 | if (debug_threads) | |
1774 | { | |
1775 | if (bp_explains_trap) | |
1776 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1777 | if (step_over_finished) | |
1778 | fprintf (stderr, "Step-over finished.\n"); | |
1779 | } | |
1780 | ||
1781 | /* We're not reporting this breakpoint to GDB, so apply the | |
1782 | decr_pc_after_break adjustment to the inferior's regcache | |
1783 | ourselves. */ | |
1784 | ||
1785 | if (the_low_target.set_pc != NULL) | |
1786 | { | |
1787 | struct regcache *regcache | |
1788 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
1789 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
1790 | } | |
1791 | ||
1792 | /* We've finished stepping over a breakpoint. We've stopped all | |
1793 | LWPs momentarily except the stepping one. This is where we | |
1794 | resume them all again. We're going to keep waiting, so use | |
1795 | proceed, which handles stepping over the next breakpoint. */ | |
1796 | if (debug_threads) | |
1797 | fprintf (stderr, "proceeding all threads.\n"); | |
1798 | proceed_all_lwps (); | |
1799 | goto retry; | |
1800 | } | |
1801 | ||
1802 | if (debug_threads) | |
1803 | { | |
1804 | if (event_child->last_resume_kind == resume_step) | |
1805 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); | |
1806 | if (event_child->stopped_by_watchpoint) | |
1807 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
1808 | if (gdb_breakpoint_here (event_child->stop_pc)) |
1809 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
1810 | if (debug_threads) |
1811 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
1812 | } | |
1813 | ||
1814 | /* Alright, we're going to report a stop. */ | |
1815 | ||
1816 | if (!non_stop) | |
1817 | { | |
1818 | /* In all-stop, stop all threads. */ | |
1819 | stop_all_lwps (); | |
1820 | ||
1821 | /* If we're not waiting for a specific LWP, choose an event LWP | |
1822 | from among those that have had events. Giving equal priority | |
1823 | to all LWPs that have had events helps prevent | |
1824 | starvation. */ | |
1825 | if (ptid_equal (ptid, minus_one_ptid)) | |
1826 | { | |
1827 | event_child->status_pending_p = 1; | |
1828 | event_child->status_pending = w; | |
1829 | ||
1830 | select_event_lwp (&event_child); | |
1831 | ||
1832 | event_child->status_pending_p = 0; | |
1833 | w = event_child->status_pending; | |
1834 | } | |
1835 | ||
1836 | /* Now that we've selected our final event LWP, cancel any | |
1837 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
1838 | See the comment in cancel_breakpoints_callback to find out | |
1839 | why. */ | |
1840 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
1841 | } | |
1842 | else | |
1843 | { | |
1844 | /* If we just finished a step-over, then all threads had been | |
1845 | momentarily paused. In all-stop, that's fine, we want | |
1846 | threads stopped by now anyway. In non-stop, we need to | |
1847 | re-resume threads that GDB wanted to be running. */ | |
1848 | if (step_over_finished) | |
1849 | unstop_all_lwps (event_child); | |
1850 | } | |
1851 | ||
5b1c542e | 1852 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1853 | |
d50171e4 PA |
1854 | /* Do this before the gdb_wants_all_stopped calls below, since they |
1855 | always set last_resume_kind to resume_stop. */ | |
6bf5e0ba | 1856 | if (event_child->last_resume_kind == resume_stop && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
1857 | { |
1858 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1859 | and it stopped cleanly, so report as SIG0. The use of | |
1860 | SIGSTOP is an implementation detail. */ | |
1861 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1862 | } | |
6bf5e0ba | 1863 | else if (event_child->last_resume_kind == resume_stop && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
1864 | { |
1865 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 1866 | but, it stopped for other reasons. */ |
bd99dc85 PA |
1867 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
1868 | } | |
1869 | else | |
1870 | { | |
1871 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1872 | } | |
1873 | ||
d50171e4 PA |
1874 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
1875 | ||
1876 | if (!non_stop) | |
1877 | { | |
d50171e4 PA |
1878 | /* From GDB's perspective, all-stop mode always stops all |
1879 | threads implicitly. Tag all threads as "want-stopped". */ | |
1880 | gdb_wants_all_stopped (); | |
1881 | } | |
1882 | else | |
1883 | { | |
1884 | /* We're reporting this LWP as stopped. Update it's | |
1885 | "want-stopped" state to what the client wants, until it gets | |
1886 | a new resume action. */ | |
6bf5e0ba | 1887 | gdb_wants_lwp_stopped (&event_child->head); |
d50171e4 PA |
1888 | } |
1889 | ||
bd99dc85 | 1890 | if (debug_threads) |
95954743 | 1891 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 1892 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
1893 | ourstatus->kind, |
1894 | ourstatus->value.sig); | |
1895 | ||
6bf5e0ba PA |
1896 | get_lwp_thread (event_child)->last_status = *ourstatus; |
1897 | return ptid_of (event_child); | |
bd99dc85 PA |
1898 | } |
1899 | ||
1900 | /* Get rid of any pending event in the pipe. */ | |
1901 | static void | |
1902 | async_file_flush (void) | |
1903 | { | |
1904 | int ret; | |
1905 | char buf; | |
1906 | ||
1907 | do | |
1908 | ret = read (linux_event_pipe[0], &buf, 1); | |
1909 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1910 | } | |
1911 | ||
1912 | /* Put something in the pipe, so the event loop wakes up. */ | |
1913 | static void | |
1914 | async_file_mark (void) | |
1915 | { | |
1916 | int ret; | |
1917 | ||
1918 | async_file_flush (); | |
1919 | ||
1920 | do | |
1921 | ret = write (linux_event_pipe[1], "+", 1); | |
1922 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1923 | ||
1924 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1925 | be awakened anyway. */ | |
1926 | } | |
1927 | ||
95954743 PA |
1928 | static ptid_t |
1929 | linux_wait (ptid_t ptid, | |
1930 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1931 | { |
95954743 | 1932 | ptid_t event_ptid; |
bd99dc85 PA |
1933 | |
1934 | if (debug_threads) | |
95954743 | 1935 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1936 | |
1937 | /* Flush the async file first. */ | |
1938 | if (target_is_async_p ()) | |
1939 | async_file_flush (); | |
1940 | ||
95954743 | 1941 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1942 | |
1943 | /* If at least one stop was reported, there may be more. A single | |
1944 | SIGCHLD can signal more than one child stop. */ | |
1945 | if (target_is_async_p () | |
1946 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1947 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1948 | async_file_mark (); |
1949 | ||
1950 | return event_ptid; | |
da6d8c04 DJ |
1951 | } |
1952 | ||
c5f62d5f | 1953 | /* Send a signal to an LWP. */ |
fd500816 DJ |
1954 | |
1955 | static int | |
a1928bad | 1956 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 1957 | { |
c5f62d5f DE |
1958 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1959 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 1960 | |
c5f62d5f DE |
1961 | #ifdef __NR_tkill |
1962 | { | |
1963 | static int tkill_failed; | |
fd500816 | 1964 | |
c5f62d5f DE |
1965 | if (!tkill_failed) |
1966 | { | |
1967 | int ret; | |
1968 | ||
1969 | errno = 0; | |
1970 | ret = syscall (__NR_tkill, lwpid, signo); | |
1971 | if (errno != ENOSYS) | |
1972 | return ret; | |
1973 | tkill_failed = 1; | |
1974 | } | |
1975 | } | |
fd500816 DJ |
1976 | #endif |
1977 | ||
1978 | return kill (lwpid, signo); | |
1979 | } | |
1980 | ||
0d62e5e8 DJ |
1981 | static void |
1982 | send_sigstop (struct inferior_list_entry *entry) | |
1983 | { | |
54a0b537 | 1984 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1985 | int pid; |
0d62e5e8 | 1986 | |
54a0b537 | 1987 | if (lwp->stopped) |
0d62e5e8 DJ |
1988 | return; |
1989 | ||
bd99dc85 PA |
1990 | pid = lwpid_of (lwp); |
1991 | ||
0d62e5e8 DJ |
1992 | /* If we already have a pending stop signal for this process, don't |
1993 | send another. */ | |
54a0b537 | 1994 | if (lwp->stop_expected) |
0d62e5e8 | 1995 | { |
ae13219e | 1996 | if (debug_threads) |
bd99dc85 | 1997 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 1998 | |
0d62e5e8 DJ |
1999 | return; |
2000 | } | |
2001 | ||
2002 | if (debug_threads) | |
bd99dc85 | 2003 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2004 | |
d50171e4 | 2005 | lwp->stop_expected = 1; |
bd99dc85 | 2006 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2007 | } |
2008 | ||
95954743 PA |
2009 | static void |
2010 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2011 | { | |
2012 | /* It's dead, really. */ | |
2013 | lwp->dead = 1; | |
2014 | ||
2015 | /* Store the exit status for later. */ | |
2016 | lwp->status_pending_p = 1; | |
2017 | lwp->status_pending = wstat; | |
2018 | ||
95954743 PA |
2019 | /* Prevent trying to stop it. */ |
2020 | lwp->stopped = 1; | |
2021 | ||
2022 | /* No further stops are expected from a dead lwp. */ | |
2023 | lwp->stop_expected = 0; | |
2024 | } | |
2025 | ||
0d62e5e8 DJ |
2026 | static void |
2027 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2028 | { | |
54a0b537 | 2029 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2030 | struct thread_info *saved_inferior; |
a1928bad | 2031 | int wstat; |
95954743 PA |
2032 | ptid_t saved_tid; |
2033 | ptid_t ptid; | |
d50171e4 | 2034 | int pid; |
0d62e5e8 | 2035 | |
54a0b537 | 2036 | if (lwp->stopped) |
d50171e4 PA |
2037 | { |
2038 | if (debug_threads) | |
2039 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2040 | lwpid_of (lwp)); | |
2041 | return; | |
2042 | } | |
0d62e5e8 DJ |
2043 | |
2044 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2045 | if (saved_inferior != NULL) |
2046 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2047 | else | |
95954743 | 2048 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2049 | |
95954743 | 2050 | ptid = lwp->head.id; |
bd99dc85 | 2051 | |
d50171e4 PA |
2052 | if (debug_threads) |
2053 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2054 | ||
2055 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2056 | |
2057 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2058 | and record the pending SIGSTOP. If the process exited, just | |
2059 | return. */ | |
d50171e4 | 2060 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2061 | { |
2062 | if (debug_threads) | |
d50171e4 PA |
2063 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2064 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2065 | |
d50171e4 | 2066 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2067 | { |
2068 | if (debug_threads) | |
d50171e4 PA |
2069 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2070 | lwpid_of (lwp), wstat); | |
2071 | ||
c35fafde PA |
2072 | lwp->status_pending_p = 1; |
2073 | lwp->status_pending = wstat; | |
2074 | } | |
0d62e5e8 | 2075 | } |
d50171e4 | 2076 | else |
95954743 PA |
2077 | { |
2078 | if (debug_threads) | |
d50171e4 | 2079 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2080 | |
d50171e4 PA |
2081 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2082 | if (lwp) | |
2083 | { | |
2084 | /* Leave this status pending for the next time we're able to | |
2085 | report it. In the mean time, we'll report this lwp as | |
2086 | dead to GDB, so GDB doesn't try to read registers and | |
2087 | memory from it. This can only happen if this was the | |
2088 | last thread of the process; otherwise, PID is removed | |
2089 | from the thread tables before linux_wait_for_event | |
2090 | returns. */ | |
2091 | mark_lwp_dead (lwp, wstat); | |
2092 | } | |
95954743 | 2093 | } |
0d62e5e8 | 2094 | |
bd99dc85 | 2095 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2096 | current_inferior = saved_inferior; |
2097 | else | |
2098 | { | |
2099 | if (debug_threads) | |
2100 | fprintf (stderr, "Previously current thread died.\n"); | |
2101 | ||
bd99dc85 PA |
2102 | if (non_stop) |
2103 | { | |
2104 | /* We can't change the current inferior behind GDB's back, | |
2105 | otherwise, a subsequent command may apply to the wrong | |
2106 | process. */ | |
2107 | current_inferior = NULL; | |
2108 | } | |
2109 | else | |
2110 | { | |
2111 | /* Set a valid thread as current. */ | |
2112 | set_desired_inferior (0); | |
2113 | } | |
0d62e5e8 DJ |
2114 | } |
2115 | } | |
2116 | ||
2117 | static void | |
54a0b537 | 2118 | stop_all_lwps (void) |
0d62e5e8 DJ |
2119 | { |
2120 | stopping_threads = 1; | |
54a0b537 PA |
2121 | for_each_inferior (&all_lwps, send_sigstop); |
2122 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
2123 | stopping_threads = 0; |
2124 | } | |
2125 | ||
da6d8c04 DJ |
2126 | /* Resume execution of the inferior process. |
2127 | If STEP is nonzero, single-step it. | |
2128 | If SIGNAL is nonzero, give it that signal. */ | |
2129 | ||
ce3a066d | 2130 | static void |
2acc282a | 2131 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 2132 | int step, int signal, siginfo_t *info) |
da6d8c04 | 2133 | { |
0d62e5e8 DJ |
2134 | struct thread_info *saved_inferior; |
2135 | ||
54a0b537 | 2136 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
2137 | return; |
2138 | ||
2139 | /* If we have pending signals or status, and a new signal, enqueue the | |
2140 | signal. Also enqueue the signal if we are waiting to reinsert a | |
2141 | breakpoint; it will be picked up again below. */ | |
2142 | if (signal != 0 | |
54a0b537 PA |
2143 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
2144 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
2145 | { |
2146 | struct pending_signals *p_sig; | |
bca929d3 | 2147 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 2148 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 2149 | p_sig->signal = signal; |
32ca6d61 DJ |
2150 | if (info == NULL) |
2151 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2152 | else | |
2153 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 2154 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
2155 | } |
2156 | ||
d50171e4 PA |
2157 | if (lwp->status_pending_p) |
2158 | { | |
2159 | if (debug_threads) | |
2160 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
2161 | " has pending status\n", | |
2162 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
2163 | lwp->stop_expected ? "expected" : "not expected"); | |
2164 | return; | |
2165 | } | |
0d62e5e8 DJ |
2166 | |
2167 | saved_inferior = current_inferior; | |
54a0b537 | 2168 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
2169 | |
2170 | if (debug_threads) | |
1b3f6016 | 2171 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 2172 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 2173 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
2174 | |
2175 | /* This bit needs some thinking about. If we get a signal that | |
2176 | we must report while a single-step reinsert is still pending, | |
2177 | we often end up resuming the thread. It might be better to | |
2178 | (ew) allow a stack of pending events; then we could be sure that | |
2179 | the reinsert happened right away and not lose any signals. | |
2180 | ||
2181 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 2182 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
2183 | complete correctness, so it won't solve that problem. It may be |
2184 | worthwhile just to solve this one, however. */ | |
54a0b537 | 2185 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
2186 | { |
2187 | if (debug_threads) | |
d50171e4 PA |
2188 | fprintf (stderr, " pending reinsert at 0x%s\n", |
2189 | paddress (lwp->bp_reinsert)); | |
2190 | ||
2191 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
2192 | { | |
2193 | if (step == 0) | |
2194 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
2195 | ||
2196 | step = 1; | |
2197 | } | |
0d62e5e8 DJ |
2198 | |
2199 | /* Postpone any pending signal. It was enqueued above. */ | |
2200 | signal = 0; | |
2201 | } | |
2202 | ||
aa691b87 | 2203 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 2204 | { |
442ea881 PA |
2205 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
2206 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 2207 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
2208 | } |
2209 | ||
2210 | /* If we have pending signals, consume one unless we are trying to reinsert | |
2211 | a breakpoint. */ | |
54a0b537 | 2212 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
2213 | { |
2214 | struct pending_signals **p_sig; | |
2215 | ||
54a0b537 | 2216 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
2217 | while ((*p_sig)->prev != NULL) |
2218 | p_sig = &(*p_sig)->prev; | |
2219 | ||
2220 | signal = (*p_sig)->signal; | |
32ca6d61 | 2221 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 2222 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 2223 | |
0d62e5e8 DJ |
2224 | free (*p_sig); |
2225 | *p_sig = NULL; | |
2226 | } | |
2227 | ||
aa5ca48f DE |
2228 | if (the_low_target.prepare_to_resume != NULL) |
2229 | the_low_target.prepare_to_resume (lwp); | |
2230 | ||
0d62e5e8 | 2231 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 2232 | get_lwp_thread (lwp)); |
da6d8c04 | 2233 | errno = 0; |
54a0b537 | 2234 | lwp->stopped = 0; |
c3adc08c | 2235 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 2236 | lwp->stepping = step; |
14ce3065 DE |
2237 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
2238 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2239 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2240 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
2241 | |
2242 | current_inferior = saved_inferior; | |
da6d8c04 | 2243 | if (errno) |
3221518c UW |
2244 | { |
2245 | /* ESRCH from ptrace either means that the thread was already | |
2246 | running (an error) or that it is gone (a race condition). If | |
2247 | it's gone, we will get a notification the next time we wait, | |
2248 | so we can ignore the error. We could differentiate these | |
2249 | two, but it's tricky without waiting; the thread still exists | |
2250 | as a zombie, so sending it signal 0 would succeed. So just | |
2251 | ignore ESRCH. */ | |
2252 | if (errno == ESRCH) | |
2253 | return; | |
2254 | ||
2255 | perror_with_name ("ptrace"); | |
2256 | } | |
da6d8c04 DJ |
2257 | } |
2258 | ||
2bd7c093 PA |
2259 | struct thread_resume_array |
2260 | { | |
2261 | struct thread_resume *resume; | |
2262 | size_t n; | |
2263 | }; | |
64386c31 DJ |
2264 | |
2265 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
2266 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
2267 | resume request. | |
2268 | ||
2269 | This algorithm is O(threads * resume elements), but resume elements | |
2270 | is small (and will remain small at least until GDB supports thread | |
2271 | suspension). */ | |
2bd7c093 PA |
2272 | static int |
2273 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 2274 | { |
54a0b537 | 2275 | struct lwp_info *lwp; |
64386c31 | 2276 | struct thread_info *thread; |
5544ad89 | 2277 | int ndx; |
2bd7c093 | 2278 | struct thread_resume_array *r; |
64386c31 DJ |
2279 | |
2280 | thread = (struct thread_info *) entry; | |
54a0b537 | 2281 | lwp = get_thread_lwp (thread); |
2bd7c093 | 2282 | r = arg; |
64386c31 | 2283 | |
2bd7c093 | 2284 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
2285 | { |
2286 | ptid_t ptid = r->resume[ndx].thread; | |
2287 | if (ptid_equal (ptid, minus_one_ptid) | |
2288 | || ptid_equal (ptid, entry->id) | |
2289 | || (ptid_is_pid (ptid) | |
2290 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
2291 | || (ptid_get_lwp (ptid) == -1 | |
2292 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
2293 | { | |
d50171e4 PA |
2294 | if (r->resume[ndx].kind == resume_stop |
2295 | && lwp->last_resume_kind == resume_stop) | |
2296 | { | |
2297 | if (debug_threads) | |
2298 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
2299 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
2300 | ? "stopped" | |
2301 | : "stopping", | |
2302 | lwpid_of (lwp)); | |
2303 | ||
2304 | continue; | |
2305 | } | |
2306 | ||
95954743 | 2307 | lwp->resume = &r->resume[ndx]; |
d50171e4 | 2308 | lwp->last_resume_kind = lwp->resume->kind; |
95954743 PA |
2309 | return 0; |
2310 | } | |
2311 | } | |
2bd7c093 PA |
2312 | |
2313 | /* No resume action for this thread. */ | |
2314 | lwp->resume = NULL; | |
64386c31 | 2315 | |
2bd7c093 | 2316 | return 0; |
5544ad89 DJ |
2317 | } |
2318 | ||
5544ad89 | 2319 | |
bd99dc85 PA |
2320 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
2321 | static int | |
2322 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 2323 | { |
bd99dc85 | 2324 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 2325 | |
bd99dc85 PA |
2326 | /* LWPs which will not be resumed are not interesting, because |
2327 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 2328 | if (lwp->resume == NULL) |
bd99dc85 | 2329 | return 0; |
64386c31 | 2330 | |
bd99dc85 | 2331 | if (lwp->status_pending_p) |
d50171e4 PA |
2332 | * (int *) flag_p = 1; |
2333 | ||
2334 | return 0; | |
2335 | } | |
2336 | ||
2337 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
2338 | internal breakpoint that we need to step over. It assumes that any | |
2339 | required STOP_PC adjustment has already been propagated to the | |
2340 | inferior's regcache. */ | |
2341 | ||
2342 | static int | |
2343 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
2344 | { | |
2345 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2346 | struct thread_info *saved_inferior; | |
2347 | CORE_ADDR pc; | |
2348 | ||
2349 | /* LWPs which will not be resumed are not interesting, because we | |
2350 | might not wait for them next time through linux_wait. */ | |
2351 | ||
2352 | if (!lwp->stopped) | |
2353 | { | |
2354 | if (debug_threads) | |
2355 | fprintf (stderr, | |
2356 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
2357 | lwpid_of (lwp)); | |
2358 | return 0; | |
2359 | } | |
2360 | ||
2361 | if (lwp->last_resume_kind == resume_stop) | |
2362 | { | |
2363 | if (debug_threads) | |
2364 | fprintf (stderr, | |
2365 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
2366 | lwpid_of (lwp)); | |
2367 | return 0; | |
2368 | } | |
2369 | ||
2370 | if (!lwp->need_step_over) | |
2371 | { | |
2372 | if (debug_threads) | |
2373 | fprintf (stderr, | |
2374 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
2375 | } | |
5544ad89 | 2376 | |
bd99dc85 | 2377 | if (lwp->status_pending_p) |
d50171e4 PA |
2378 | { |
2379 | if (debug_threads) | |
2380 | fprintf (stderr, | |
2381 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
2382 | lwpid_of (lwp)); | |
2383 | return 0; | |
2384 | } | |
2385 | ||
2386 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
2387 | or we have. */ | |
2388 | pc = get_pc (lwp); | |
2389 | ||
2390 | /* If the PC has changed since we stopped, then don't do anything, | |
2391 | and let the breakpoint/tracepoint be hit. This happens if, for | |
2392 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
2393 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
2394 | command, or poked thread's registers herself. */ | |
2395 | if (pc != lwp->stop_pc) | |
2396 | { | |
2397 | if (debug_threads) | |
2398 | fprintf (stderr, | |
2399 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
2400 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
2401 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
2402 | ||
2403 | lwp->need_step_over = 0; | |
2404 | return 0; | |
2405 | } | |
2406 | ||
2407 | saved_inferior = current_inferior; | |
2408 | current_inferior = get_lwp_thread (lwp); | |
2409 | ||
8b07ae33 | 2410 | /* We can only step over breakpoints we know about. */ |
d50171e4 PA |
2411 | if (breakpoint_here (pc)) |
2412 | { | |
8b07ae33 PA |
2413 | /* Don't step over a breakpoint that GDB expects to hit |
2414 | though. */ | |
2415 | if (gdb_breakpoint_here (pc)) | |
2416 | { | |
2417 | if (debug_threads) | |
2418 | fprintf (stderr, | |
2419 | "Need step over [LWP %ld]? yes, but found" | |
2420 | " GDB breakpoint at 0x%s; skipping step over\n", | |
2421 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 2422 | |
8b07ae33 PA |
2423 | current_inferior = saved_inferior; |
2424 | return 0; | |
2425 | } | |
2426 | else | |
2427 | { | |
2428 | if (debug_threads) | |
2429 | fprintf (stderr, | |
2430 | "Need step over [LWP %ld]? yes, found breakpoint at 0x%s\n", | |
2431 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 2432 | |
8b07ae33 PA |
2433 | /* We've found an lwp that needs stepping over --- return 1 so |
2434 | that find_inferior stops looking. */ | |
2435 | current_inferior = saved_inferior; | |
2436 | ||
2437 | /* If the step over is cancelled, this is set again. */ | |
2438 | lwp->need_step_over = 0; | |
2439 | return 1; | |
2440 | } | |
d50171e4 PA |
2441 | } |
2442 | ||
2443 | current_inferior = saved_inferior; | |
2444 | ||
2445 | if (debug_threads) | |
2446 | fprintf (stderr, | |
2447 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
2448 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 2449 | |
bd99dc85 | 2450 | return 0; |
5544ad89 DJ |
2451 | } |
2452 | ||
d50171e4 PA |
2453 | /* Start a step-over operation on LWP. When LWP stopped at a |
2454 | breakpoint, to make progress, we need to remove the breakpoint out | |
2455 | of the way. If we let other threads run while we do that, they may | |
2456 | pass by the breakpoint location and miss hitting it. To avoid | |
2457 | that, a step-over momentarily stops all threads while LWP is | |
2458 | single-stepped while the breakpoint is temporarily uninserted from | |
2459 | the inferior. When the single-step finishes, we reinsert the | |
2460 | breakpoint, and let all threads that are supposed to be running, | |
2461 | run again. | |
2462 | ||
2463 | On targets that don't support hardware single-step, we don't | |
2464 | currently support full software single-stepping. Instead, we only | |
2465 | support stepping over the thread event breakpoint, by asking the | |
2466 | low target where to place a reinsert breakpoint. Since this | |
2467 | routine assumes the breakpoint being stepped over is a thread event | |
2468 | breakpoint, it usually assumes the return address of the current | |
2469 | function is a good enough place to set the reinsert breakpoint. */ | |
2470 | ||
2471 | static int | |
2472 | start_step_over (struct lwp_info *lwp) | |
2473 | { | |
2474 | struct thread_info *saved_inferior; | |
2475 | CORE_ADDR pc; | |
2476 | int step; | |
2477 | ||
2478 | if (debug_threads) | |
2479 | fprintf (stderr, | |
2480 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
2481 | lwpid_of (lwp)); | |
2482 | ||
2483 | stop_all_lwps (); | |
2484 | ||
2485 | if (debug_threads) | |
2486 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
2487 | ||
2488 | /* Note, we should always reach here with an already adjusted PC, | |
2489 | either by GDB (if we're resuming due to GDB's request), or by our | |
2490 | caller, if we just finished handling an internal breakpoint GDB | |
2491 | shouldn't care about. */ | |
2492 | pc = get_pc (lwp); | |
2493 | ||
2494 | saved_inferior = current_inferior; | |
2495 | current_inferior = get_lwp_thread (lwp); | |
2496 | ||
2497 | lwp->bp_reinsert = pc; | |
2498 | uninsert_breakpoints_at (pc); | |
2499 | ||
2500 | if (can_hardware_single_step ()) | |
2501 | { | |
2502 | step = 1; | |
2503 | } | |
2504 | else | |
2505 | { | |
2506 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
2507 | set_reinsert_breakpoint (raddr); | |
2508 | step = 0; | |
2509 | } | |
2510 | ||
2511 | current_inferior = saved_inferior; | |
2512 | ||
2513 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
2514 | ||
2515 | /* Require next event from this LWP. */ | |
2516 | step_over_bkpt = lwp->head.id; | |
2517 | return 1; | |
2518 | } | |
2519 | ||
2520 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
2521 | start_step_over, if still there, and delete any reinsert | |
2522 | breakpoints we've set, on non hardware single-step targets. */ | |
2523 | ||
2524 | static int | |
2525 | finish_step_over (struct lwp_info *lwp) | |
2526 | { | |
2527 | if (lwp->bp_reinsert != 0) | |
2528 | { | |
2529 | if (debug_threads) | |
2530 | fprintf (stderr, "Finished step over.\n"); | |
2531 | ||
2532 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
2533 | may be no breakpoint to reinsert there by now. */ | |
2534 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
2535 | ||
2536 | lwp->bp_reinsert = 0; | |
2537 | ||
2538 | /* Delete any software-single-step reinsert breakpoints. No | |
2539 | longer needed. We don't have to worry about other threads | |
2540 | hitting this trap, and later not being able to explain it, | |
2541 | because we were stepping over a breakpoint, and we hold all | |
2542 | threads but LWP stopped while doing that. */ | |
2543 | if (!can_hardware_single_step ()) | |
2544 | delete_reinsert_breakpoints (); | |
2545 | ||
2546 | step_over_bkpt = null_ptid; | |
2547 | return 1; | |
2548 | } | |
2549 | else | |
2550 | return 0; | |
2551 | } | |
2552 | ||
5544ad89 DJ |
2553 | /* This function is called once per thread. We check the thread's resume |
2554 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 2555 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 2556 | |
bd99dc85 PA |
2557 | For threads which we aren't explicitly told otherwise, we preserve |
2558 | the stepping flag; this is used for stepping over gdbserver-placed | |
2559 | breakpoints. | |
2560 | ||
2561 | If pending_flags was set in any thread, we queue any needed | |
2562 | signals, since we won't actually resume. We already have a pending | |
2563 | event to report, so we don't need to preserve any step requests; | |
2564 | they should be re-issued if necessary. */ | |
2565 | ||
2566 | static int | |
2567 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 2568 | { |
54a0b537 | 2569 | struct lwp_info *lwp; |
5544ad89 | 2570 | struct thread_info *thread; |
bd99dc85 | 2571 | int step; |
d50171e4 PA |
2572 | int leave_all_stopped = * (int *) arg; |
2573 | int leave_pending; | |
5544ad89 DJ |
2574 | |
2575 | thread = (struct thread_info *) entry; | |
54a0b537 | 2576 | lwp = get_thread_lwp (thread); |
5544ad89 | 2577 | |
2bd7c093 | 2578 | if (lwp->resume == NULL) |
bd99dc85 | 2579 | return 0; |
5544ad89 | 2580 | |
bd99dc85 | 2581 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 2582 | { |
bd99dc85 | 2583 | if (debug_threads) |
d50171e4 | 2584 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
2585 | |
2586 | if (!lwp->stopped) | |
2587 | { | |
2588 | if (debug_threads) | |
d50171e4 | 2589 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 2590 | |
d50171e4 PA |
2591 | /* Stop the thread, and wait for the event asynchronously, |
2592 | through the event loop. */ | |
bd99dc85 PA |
2593 | send_sigstop (&lwp->head); |
2594 | } | |
2595 | else | |
2596 | { | |
2597 | if (debug_threads) | |
d50171e4 PA |
2598 | fprintf (stderr, "already stopped LWP %ld\n", |
2599 | lwpid_of (lwp)); | |
2600 | ||
2601 | /* The LWP may have been stopped in an internal event that | |
2602 | was not meant to be notified back to GDB (e.g., gdbserver | |
2603 | breakpoint), so we should be reporting a stop event in | |
2604 | this case too. */ | |
2605 | ||
2606 | /* If the thread already has a pending SIGSTOP, this is a | |
2607 | no-op. Otherwise, something later will presumably resume | |
2608 | the thread and this will cause it to cancel any pending | |
2609 | operation, due to last_resume_kind == resume_stop. If | |
2610 | the thread already has a pending status to report, we | |
2611 | will still report it the next time we wait - see | |
2612 | status_pending_p_callback. */ | |
2613 | send_sigstop (&lwp->head); | |
bd99dc85 | 2614 | } |
32ca6d61 | 2615 | |
bd99dc85 PA |
2616 | /* For stop requests, we're done. */ |
2617 | lwp->resume = NULL; | |
d50171e4 | 2618 | get_lwp_thread (lwp)->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 2619 | return 0; |
5544ad89 DJ |
2620 | } |
2621 | ||
bd99dc85 PA |
2622 | /* If this thread which is about to be resumed has a pending status, |
2623 | then don't resume any threads - we can just report the pending | |
2624 | status. Make sure to queue any signals that would otherwise be | |
2625 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
2626 | thread has a pending status. If there's a thread that needs the |
2627 | step-over-breakpoint dance, then don't resume any other thread | |
2628 | but that particular one. */ | |
2629 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 2630 | |
d50171e4 | 2631 | if (!leave_pending) |
bd99dc85 PA |
2632 | { |
2633 | if (debug_threads) | |
2634 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 2635 | |
d50171e4 | 2636 | step = (lwp->resume->kind == resume_step); |
2acc282a | 2637 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
d50171e4 | 2638 | get_lwp_thread (lwp)->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 PA |
2639 | } |
2640 | else | |
2641 | { | |
2642 | if (debug_threads) | |
2643 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 2644 | |
bd99dc85 PA |
2645 | /* If we have a new signal, enqueue the signal. */ |
2646 | if (lwp->resume->sig != 0) | |
2647 | { | |
2648 | struct pending_signals *p_sig; | |
2649 | p_sig = xmalloc (sizeof (*p_sig)); | |
2650 | p_sig->prev = lwp->pending_signals; | |
2651 | p_sig->signal = lwp->resume->sig; | |
2652 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2653 | ||
2654 | /* If this is the same signal we were previously stopped by, | |
2655 | make sure to queue its siginfo. We can ignore the return | |
2656 | value of ptrace; if it fails, we'll skip | |
2657 | PTRACE_SETSIGINFO. */ | |
2658 | if (WIFSTOPPED (lwp->last_status) | |
2659 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
2660 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
2661 | ||
2662 | lwp->pending_signals = p_sig; | |
2663 | } | |
2664 | } | |
5544ad89 | 2665 | |
bd99dc85 | 2666 | lwp->resume = NULL; |
5544ad89 | 2667 | return 0; |
0d62e5e8 DJ |
2668 | } |
2669 | ||
2670 | static void | |
2bd7c093 | 2671 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 2672 | { |
2bd7c093 | 2673 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
2674 | struct lwp_info *need_step_over = NULL; |
2675 | int any_pending; | |
2676 | int leave_all_stopped; | |
c6ecbae5 | 2677 | |
2bd7c093 | 2678 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 2679 | |
d50171e4 PA |
2680 | /* If there is a thread which would otherwise be resumed, which has |
2681 | a pending status, then don't resume any threads - we can just | |
2682 | report the pending status. Make sure to queue any signals that | |
2683 | would otherwise be sent. In non-stop mode, we'll apply this | |
2684 | logic to each thread individually. We consume all pending events | |
2685 | before considering to start a step-over (in all-stop). */ | |
2686 | any_pending = 0; | |
bd99dc85 | 2687 | if (!non_stop) |
d50171e4 PA |
2688 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
2689 | ||
2690 | /* If there is a thread which would otherwise be resumed, which is | |
2691 | stopped at a breakpoint that needs stepping over, then don't | |
2692 | resume any threads - have it step over the breakpoint with all | |
2693 | other threads stopped, then resume all threads again. Make sure | |
2694 | to queue any signals that would otherwise be delivered or | |
2695 | queued. */ | |
2696 | if (!any_pending && supports_breakpoints ()) | |
2697 | need_step_over | |
2698 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2699 | need_step_over_p, NULL); | |
2700 | ||
2701 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
2702 | ||
2703 | if (debug_threads) | |
2704 | { | |
2705 | if (need_step_over != NULL) | |
2706 | fprintf (stderr, "Not resuming all, need step over\n"); | |
2707 | else if (any_pending) | |
2708 | fprintf (stderr, | |
2709 | "Not resuming, all-stop and found " | |
2710 | "an LWP with pending status\n"); | |
2711 | else | |
2712 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
2713 | } | |
2714 | ||
2715 | /* Even if we're leaving threads stopped, queue all signals we'd | |
2716 | otherwise deliver. */ | |
2717 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
2718 | ||
2719 | if (need_step_over) | |
2720 | start_step_over (need_step_over); | |
2721 | } | |
2722 | ||
2723 | /* This function is called once per thread. We check the thread's | |
2724 | last resume request, which will tell us whether to resume, step, or | |
2725 | leave the thread stopped. Any signal the client requested to be | |
2726 | delivered has already been enqueued at this point. | |
2727 | ||
2728 | If any thread that GDB wants running is stopped at an internal | |
2729 | breakpoint that needs stepping over, we start a step-over operation | |
2730 | on that particular thread, and leave all others stopped. */ | |
2731 | ||
2732 | static void | |
2733 | proceed_one_lwp (struct inferior_list_entry *entry) | |
2734 | { | |
2735 | struct lwp_info *lwp; | |
2736 | int step; | |
2737 | ||
2738 | lwp = (struct lwp_info *) entry; | |
2739 | ||
2740 | if (debug_threads) | |
2741 | fprintf (stderr, | |
2742 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
2743 | ||
2744 | if (!lwp->stopped) | |
2745 | { | |
2746 | if (debug_threads) | |
2747 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
2748 | return; | |
2749 | } | |
2750 | ||
2751 | if (lwp->last_resume_kind == resume_stop) | |
2752 | { | |
2753 | if (debug_threads) | |
2754 | fprintf (stderr, " client wants LWP %ld stopped\n", lwpid_of (lwp)); | |
2755 | return; | |
2756 | } | |
2757 | ||
2758 | if (lwp->status_pending_p) | |
2759 | { | |
2760 | if (debug_threads) | |
2761 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
2762 | lwpid_of (lwp)); | |
2763 | return; | |
2764 | } | |
2765 | ||
2766 | if (lwp->suspended) | |
2767 | { | |
2768 | if (debug_threads) | |
2769 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
2770 | return; | |
2771 | } | |
2772 | ||
2773 | step = lwp->last_resume_kind == resume_step; | |
2774 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
2775 | } | |
2776 | ||
2777 | /* When we finish a step-over, set threads running again. If there's | |
2778 | another thread that may need a step-over, now's the time to start | |
2779 | it. Eventually, we'll move all threads past their breakpoints. */ | |
2780 | ||
2781 | static void | |
2782 | proceed_all_lwps (void) | |
2783 | { | |
2784 | struct lwp_info *need_step_over; | |
2785 | ||
2786 | /* If there is a thread which would otherwise be resumed, which is | |
2787 | stopped at a breakpoint that needs stepping over, then don't | |
2788 | resume any threads - have it step over the breakpoint with all | |
2789 | other threads stopped, then resume all threads again. */ | |
2790 | ||
2791 | if (supports_breakpoints ()) | |
2792 | { | |
2793 | need_step_over | |
2794 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2795 | need_step_over_p, NULL); | |
2796 | ||
2797 | if (need_step_over != NULL) | |
2798 | { | |
2799 | if (debug_threads) | |
2800 | fprintf (stderr, "proceed_all_lwps: found " | |
2801 | "thread %ld needing a step-over\n", | |
2802 | lwpid_of (need_step_over)); | |
2803 | ||
2804 | start_step_over (need_step_over); | |
2805 | return; | |
2806 | } | |
2807 | } | |
5544ad89 | 2808 | |
d50171e4 PA |
2809 | if (debug_threads) |
2810 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
2811 | ||
2812 | for_each_inferior (&all_lwps, proceed_one_lwp); | |
2813 | } | |
2814 | ||
2815 | /* Stopped LWPs that the client wanted to be running, that don't have | |
2816 | pending statuses, are set to run again, except for EXCEPT, if not | |
2817 | NULL. This undoes a stop_all_lwps call. */ | |
2818 | ||
2819 | static void | |
2820 | unstop_all_lwps (struct lwp_info *except) | |
2821 | { | |
5544ad89 DJ |
2822 | if (debug_threads) |
2823 | { | |
d50171e4 PA |
2824 | if (except) |
2825 | fprintf (stderr, | |
2826 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 2827 | else |
d50171e4 PA |
2828 | fprintf (stderr, |
2829 | "unstopping all lwps\n"); | |
5544ad89 DJ |
2830 | } |
2831 | ||
d50171e4 PA |
2832 | /* Make sure proceed_one_lwp doesn't try to resume this thread. */ |
2833 | if (except != NULL) | |
2834 | ++except->suspended; | |
2835 | ||
2836 | for_each_inferior (&all_lwps, proceed_one_lwp); | |
2837 | ||
2838 | if (except != NULL) | |
2839 | --except->suspended; | |
0d62e5e8 DJ |
2840 | } |
2841 | ||
2842 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
2843 | |
2844 | int | |
0a30fbc4 | 2845 | register_addr (int regnum) |
da6d8c04 DJ |
2846 | { |
2847 | int addr; | |
2848 | ||
2ec06d2e | 2849 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
2850 | error ("Invalid register number %d.", regnum); |
2851 | ||
2ec06d2e | 2852 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2853 | |
2854 | return addr; | |
2855 | } | |
2856 | ||
58caa3dc | 2857 | /* Fetch one register. */ |
da6d8c04 | 2858 | static void |
442ea881 | 2859 | fetch_register (struct regcache *regcache, int regno) |
da6d8c04 DJ |
2860 | { |
2861 | CORE_ADDR regaddr; | |
48d93c75 | 2862 | int i, size; |
0d62e5e8 | 2863 | char *buf; |
95954743 | 2864 | int pid; |
da6d8c04 | 2865 | |
2ec06d2e | 2866 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2867 | return; |
2ec06d2e | 2868 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2869 | return; |
da6d8c04 | 2870 | |
0a30fbc4 DJ |
2871 | regaddr = register_addr (regno); |
2872 | if (regaddr == -1) | |
2873 | return; | |
95954743 PA |
2874 | |
2875 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2876 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2877 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2878 | buf = alloca (size); |
2879 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2880 | { |
2881 | errno = 0; | |
0d62e5e8 | 2882 | *(PTRACE_XFER_TYPE *) (buf + i) = |
14ce3065 DE |
2883 | ptrace (PTRACE_PEEKUSER, pid, |
2884 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2885 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2886 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
da6d8c04 DJ |
2887 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2888 | if (errno != 0) | |
f52cd8cd | 2889 | error ("reading register %d: %s", regno, strerror (errno)); |
da6d8c04 | 2890 | } |
ee1a7ae4 UW |
2891 | |
2892 | if (the_low_target.supply_ptrace_register) | |
442ea881 | 2893 | the_low_target.supply_ptrace_register (regcache, regno, buf); |
5a1f5858 | 2894 | else |
442ea881 | 2895 | supply_register (regcache, regno, buf); |
da6d8c04 DJ |
2896 | } |
2897 | ||
2898 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc | 2899 | static void |
442ea881 | 2900 | usr_fetch_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 2901 | { |
4463ce24 | 2902 | if (regno == -1) |
2ec06d2e | 2903 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 2904 | fetch_register (regcache, regno); |
da6d8c04 | 2905 | else |
442ea881 | 2906 | fetch_register (regcache, regno); |
da6d8c04 DJ |
2907 | } |
2908 | ||
2909 | /* Store our register values back into the inferior. | |
2910 | If REGNO is -1, do this for all registers. | |
2911 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc | 2912 | static void |
442ea881 | 2913 | usr_store_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 DJ |
2914 | { |
2915 | CORE_ADDR regaddr; | |
48d93c75 | 2916 | int i, size; |
0d62e5e8 | 2917 | char *buf; |
55ac2b99 | 2918 | int pid; |
da6d8c04 DJ |
2919 | |
2920 | if (regno >= 0) | |
2921 | { | |
2ec06d2e | 2922 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2923 | return; |
2924 | ||
bc1e36ca | 2925 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2926 | return; |
2927 | ||
2928 | regaddr = register_addr (regno); | |
2929 | if (regaddr == -1) | |
da6d8c04 | 2930 | return; |
da6d8c04 | 2931 | errno = 0; |
48d93c75 UW |
2932 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2933 | & - sizeof (PTRACE_XFER_TYPE); | |
2934 | buf = alloca (size); | |
2935 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2936 | |
2937 | if (the_low_target.collect_ptrace_register) | |
442ea881 | 2938 | the_low_target.collect_ptrace_register (regcache, regno, buf); |
5a1f5858 | 2939 | else |
442ea881 | 2940 | collect_register (regcache, regno, buf); |
ee1a7ae4 | 2941 | |
95954743 | 2942 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2943 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2944 | { |
0a30fbc4 | 2945 | errno = 0; |
14ce3065 DE |
2946 | ptrace (PTRACE_POKEUSER, pid, |
2947 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2948 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
2949 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
2950 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
da6d8c04 DJ |
2951 | if (errno != 0) |
2952 | { | |
1b3f6016 PA |
2953 | /* At this point, ESRCH should mean the process is |
2954 | already gone, in which case we simply ignore attempts | |
2955 | to change its registers. See also the related | |
2956 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2957 | if (errno == ESRCH) |
2958 | return; | |
2959 | ||
bc1e36ca | 2960 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
f52cd8cd | 2961 | error ("writing register %d: %s", regno, strerror (errno)); |
da6d8c04 | 2962 | } |
2ff29de4 | 2963 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2964 | } |
da6d8c04 DJ |
2965 | } |
2966 | else | |
2ec06d2e | 2967 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 2968 | usr_store_inferior_registers (regcache, regno); |
da6d8c04 | 2969 | } |
58caa3dc DJ |
2970 | #endif /* HAVE_LINUX_USRREGS */ |
2971 | ||
2972 | ||
2973 | ||
2974 | #ifdef HAVE_LINUX_REGSETS | |
2975 | ||
2976 | static int | |
442ea881 | 2977 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
2978 | { |
2979 | struct regset_info *regset; | |
e9d25b98 | 2980 | int saw_general_regs = 0; |
95954743 | 2981 | int pid; |
58caa3dc DJ |
2982 | |
2983 | regset = target_regsets; | |
2984 | ||
95954743 | 2985 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2986 | while (regset->size >= 0) |
2987 | { | |
2988 | void *buf; | |
2989 | int res; | |
2990 | ||
52fa2412 | 2991 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2992 | { |
2993 | regset ++; | |
2994 | continue; | |
2995 | } | |
2996 | ||
bca929d3 | 2997 | buf = xmalloc (regset->size); |
dfb64f85 | 2998 | #ifndef __sparc__ |
95954743 | 2999 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 3000 | #else |
95954743 | 3001 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 3002 | #endif |
58caa3dc DJ |
3003 | if (res < 0) |
3004 | { | |
3005 | if (errno == EIO) | |
3006 | { | |
52fa2412 UW |
3007 | /* If we get EIO on a regset, do not try it again for |
3008 | this process. */ | |
3009 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3010 | free (buf); |
52fa2412 | 3011 | continue; |
58caa3dc DJ |
3012 | } |
3013 | else | |
3014 | { | |
0d62e5e8 | 3015 | char s[256]; |
95954743 PA |
3016 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
3017 | pid); | |
0d62e5e8 | 3018 | perror (s); |
58caa3dc DJ |
3019 | } |
3020 | } | |
e9d25b98 DJ |
3021 | else if (regset->type == GENERAL_REGS) |
3022 | saw_general_regs = 1; | |
442ea881 | 3023 | regset->store_function (regcache, buf); |
58caa3dc | 3024 | regset ++; |
fdeb2a12 | 3025 | free (buf); |
58caa3dc | 3026 | } |
e9d25b98 DJ |
3027 | if (saw_general_regs) |
3028 | return 0; | |
3029 | else | |
3030 | return 1; | |
58caa3dc DJ |
3031 | } |
3032 | ||
3033 | static int | |
442ea881 | 3034 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3035 | { |
3036 | struct regset_info *regset; | |
e9d25b98 | 3037 | int saw_general_regs = 0; |
95954743 | 3038 | int pid; |
58caa3dc DJ |
3039 | |
3040 | regset = target_regsets; | |
3041 | ||
95954743 | 3042 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3043 | while (regset->size >= 0) |
3044 | { | |
3045 | void *buf; | |
3046 | int res; | |
3047 | ||
52fa2412 | 3048 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3049 | { |
3050 | regset ++; | |
3051 | continue; | |
3052 | } | |
3053 | ||
bca929d3 | 3054 | buf = xmalloc (regset->size); |
545587ee DJ |
3055 | |
3056 | /* First fill the buffer with the current register set contents, | |
3057 | in case there are any items in the kernel's regset that are | |
3058 | not in gdbserver's regcache. */ | |
dfb64f85 | 3059 | #ifndef __sparc__ |
95954743 | 3060 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 3061 | #else |
95954743 | 3062 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 3063 | #endif |
545587ee DJ |
3064 | |
3065 | if (res == 0) | |
3066 | { | |
3067 | /* Then overlay our cached registers on that. */ | |
442ea881 | 3068 | regset->fill_function (regcache, buf); |
545587ee DJ |
3069 | |
3070 | /* Only now do we write the register set. */ | |
dfb64f85 | 3071 | #ifndef __sparc__ |
95954743 | 3072 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 3073 | #else |
95954743 | 3074 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 3075 | #endif |
545587ee DJ |
3076 | } |
3077 | ||
58caa3dc DJ |
3078 | if (res < 0) |
3079 | { | |
3080 | if (errno == EIO) | |
3081 | { | |
52fa2412 UW |
3082 | /* If we get EIO on a regset, do not try it again for |
3083 | this process. */ | |
3084 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3085 | free (buf); |
52fa2412 | 3086 | continue; |
58caa3dc | 3087 | } |
3221518c UW |
3088 | else if (errno == ESRCH) |
3089 | { | |
1b3f6016 PA |
3090 | /* At this point, ESRCH should mean the process is |
3091 | already gone, in which case we simply ignore attempts | |
3092 | to change its registers. See also the related | |
3093 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 3094 | free (buf); |
3221518c UW |
3095 | return 0; |
3096 | } | |
58caa3dc DJ |
3097 | else |
3098 | { | |
ce3a066d | 3099 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
3100 | } |
3101 | } | |
e9d25b98 DJ |
3102 | else if (regset->type == GENERAL_REGS) |
3103 | saw_general_regs = 1; | |
58caa3dc | 3104 | regset ++; |
09ec9b38 | 3105 | free (buf); |
58caa3dc | 3106 | } |
e9d25b98 DJ |
3107 | if (saw_general_regs) |
3108 | return 0; | |
3109 | else | |
3110 | return 1; | |
ce3a066d | 3111 | return 0; |
58caa3dc DJ |
3112 | } |
3113 | ||
3114 | #endif /* HAVE_LINUX_REGSETS */ | |
3115 | ||
3116 | ||
3117 | void | |
442ea881 | 3118 | linux_fetch_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3119 | { |
3120 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3121 | if (regsets_fetch_inferior_registers (regcache) == 0) |
52fa2412 | 3122 | return; |
58caa3dc DJ |
3123 | #endif |
3124 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3125 | usr_fetch_inferior_registers (regcache, regno); |
58caa3dc DJ |
3126 | #endif |
3127 | } | |
3128 | ||
3129 | void | |
442ea881 | 3130 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3131 | { |
3132 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3133 | if (regsets_store_inferior_registers (regcache) == 0) |
52fa2412 | 3134 | return; |
58caa3dc DJ |
3135 | #endif |
3136 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3137 | usr_store_inferior_registers (regcache, regno); |
58caa3dc DJ |
3138 | #endif |
3139 | } | |
3140 | ||
da6d8c04 | 3141 | |
da6d8c04 DJ |
3142 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
3143 | to debugger memory starting at MYADDR. */ | |
3144 | ||
c3e735a6 | 3145 | static int |
f450004a | 3146 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
3147 | { |
3148 | register int i; | |
3149 | /* Round starting address down to longword boundary. */ | |
3150 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
3151 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
3152 | register int count |
3153 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
3154 | / sizeof (PTRACE_XFER_TYPE); |
3155 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 3156 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 3157 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
3158 | int fd; |
3159 | char filename[64]; | |
95954743 | 3160 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
3161 | |
3162 | /* Try using /proc. Don't bother for one word. */ | |
3163 | if (len >= 3 * sizeof (long)) | |
3164 | { | |
3165 | /* We could keep this file open and cache it - possibly one per | |
3166 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 3167 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
3168 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
3169 | if (fd == -1) | |
3170 | goto no_proc; | |
3171 | ||
3172 | /* If pread64 is available, use it. It's faster if the kernel | |
3173 | supports it (only one syscall), and it's 64-bit safe even on | |
3174 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
3175 | application). */ | |
3176 | #ifdef HAVE_PREAD64 | |
3177 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
3178 | #else | |
1de1badb | 3179 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
3180 | #endif |
3181 | { | |
3182 | close (fd); | |
3183 | goto no_proc; | |
3184 | } | |
3185 | ||
3186 | close (fd); | |
3187 | return 0; | |
3188 | } | |
da6d8c04 | 3189 | |
fd462a61 | 3190 | no_proc: |
da6d8c04 DJ |
3191 | /* Read all the longwords */ |
3192 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
3193 | { | |
c3e735a6 | 3194 | errno = 0; |
14ce3065 DE |
3195 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
3196 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3197 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
3198 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
3199 | if (errno) |
3200 | return errno; | |
da6d8c04 DJ |
3201 | } |
3202 | ||
3203 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
3204 | memcpy (myaddr, |
3205 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
3206 | len); | |
c3e735a6 DJ |
3207 | |
3208 | return 0; | |
da6d8c04 DJ |
3209 | } |
3210 | ||
93ae6fdc PA |
3211 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
3212 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
3213 | returns the value of errno. */ |
3214 | ||
ce3a066d | 3215 | static int |
f450004a | 3216 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
3217 | { |
3218 | register int i; | |
3219 | /* Round starting address down to longword boundary. */ | |
3220 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
3221 | /* Round ending address up; get number of longwords that makes. */ | |
3222 | register int count | |
3223 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
3224 | /* Allocate buffer of that many longwords. */ | |
3225 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 3226 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 3227 | |
0d62e5e8 DJ |
3228 | if (debug_threads) |
3229 | { | |
58d6951d DJ |
3230 | /* Dump up to four bytes. */ |
3231 | unsigned int val = * (unsigned int *) myaddr; | |
3232 | if (len == 1) | |
3233 | val = val & 0xff; | |
3234 | else if (len == 2) | |
3235 | val = val & 0xffff; | |
3236 | else if (len == 3) | |
3237 | val = val & 0xffffff; | |
3238 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
3239 | val, (long)memaddr); | |
0d62e5e8 DJ |
3240 | } |
3241 | ||
da6d8c04 DJ |
3242 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
3243 | ||
93ae6fdc | 3244 | errno = 0; |
14ce3065 DE |
3245 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
3246 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3247 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
3248 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
3249 | if (errno) |
3250 | return errno; | |
da6d8c04 DJ |
3251 | |
3252 | if (count > 1) | |
3253 | { | |
93ae6fdc | 3254 | errno = 0; |
da6d8c04 | 3255 | buffer[count - 1] |
95954743 | 3256 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
3257 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3258 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3259 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
3260 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 3261 | 0); |
93ae6fdc PA |
3262 | if (errno) |
3263 | return errno; | |
da6d8c04 DJ |
3264 | } |
3265 | ||
93ae6fdc | 3266 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 DJ |
3267 | |
3268 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
3269 | ||
3270 | /* Write the entire buffer. */ | |
3271 | ||
3272 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
3273 | { | |
3274 | errno = 0; | |
14ce3065 DE |
3275 | ptrace (PTRACE_POKETEXT, pid, |
3276 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3277 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3278 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
3279 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
3280 | if (errno) |
3281 | return errno; | |
3282 | } | |
3283 | ||
3284 | return 0; | |
3285 | } | |
2f2893d9 | 3286 | |
6076632b | 3287 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
3288 | static int linux_supports_tracefork_flag; |
3289 | ||
51c2684e | 3290 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 3291 | |
51c2684e DJ |
3292 | static int |
3293 | linux_tracefork_grandchild (void *arg) | |
3294 | { | |
3295 | _exit (0); | |
3296 | } | |
3297 | ||
7407e2de AS |
3298 | #define STACK_SIZE 4096 |
3299 | ||
51c2684e DJ |
3300 | static int |
3301 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
3302 | { |
3303 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
3304 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
3305 | |
3306 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
3307 | ||
3308 | if (fork () == 0) | |
3309 | linux_tracefork_grandchild (NULL); | |
3310 | ||
3311 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3312 | ||
7407e2de AS |
3313 | #ifdef __ia64__ |
3314 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
3315 | CLONE_VM | SIGCHLD, NULL); | |
3316 | #else | |
3317 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
3318 | CLONE_VM | SIGCHLD, NULL); | |
3319 | #endif | |
e4b7f41c JK |
3320 | |
3321 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3322 | ||
24a09b5f DJ |
3323 | _exit (0); |
3324 | } | |
3325 | ||
24a09b5f DJ |
3326 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
3327 | sure that we can enable the option, and that it had the desired | |
3328 | effect. */ | |
3329 | ||
3330 | static void | |
3331 | linux_test_for_tracefork (void) | |
3332 | { | |
3333 | int child_pid, ret, status; | |
3334 | long second_pid; | |
e4b7f41c | 3335 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 3336 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 3337 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
3338 | |
3339 | linux_supports_tracefork_flag = 0; | |
3340 | ||
e4b7f41c JK |
3341 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
3342 | ||
3343 | child_pid = fork (); | |
3344 | if (child_pid == 0) | |
3345 | linux_tracefork_child (NULL); | |
3346 | ||
3347 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3348 | ||
51c2684e | 3349 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
3350 | #ifdef __ia64__ |
3351 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
3352 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 3353 | #else /* !__ia64__ */ |
7407e2de AS |
3354 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
3355 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
3356 | #endif /* !__ia64__ */ |
3357 | ||
3358 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3359 | ||
24a09b5f | 3360 | if (child_pid == -1) |
51c2684e | 3361 | perror_with_name ("clone"); |
24a09b5f DJ |
3362 | |
3363 | ret = my_waitpid (child_pid, &status, 0); | |
3364 | if (ret == -1) | |
3365 | perror_with_name ("waitpid"); | |
3366 | else if (ret != child_pid) | |
3367 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
3368 | if (! WIFSTOPPED (status)) | |
3369 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
3370 | ||
14ce3065 DE |
3371 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
3372 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
3373 | if (ret != 0) |
3374 | { | |
3375 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
3376 | if (ret != 0) | |
3377 | { | |
3378 | warning ("linux_test_for_tracefork: failed to kill child"); | |
3379 | return; | |
3380 | } | |
3381 | ||
3382 | ret = my_waitpid (child_pid, &status, 0); | |
3383 | if (ret != child_pid) | |
3384 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
3385 | else if (!WIFSIGNALED (status)) | |
3386 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
3387 | "killed child", status); | |
3388 | ||
3389 | return; | |
3390 | } | |
3391 | ||
3392 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
3393 | if (ret != 0) | |
3394 | warning ("linux_test_for_tracefork: failed to resume child"); | |
3395 | ||
3396 | ret = my_waitpid (child_pid, &status, 0); | |
3397 | ||
3398 | if (ret == child_pid && WIFSTOPPED (status) | |
3399 | && status >> 16 == PTRACE_EVENT_FORK) | |
3400 | { | |
3401 | second_pid = 0; | |
3402 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
3403 | if (ret == 0 && second_pid != 0) | |
3404 | { | |
3405 | int second_status; | |
3406 | ||
3407 | linux_supports_tracefork_flag = 1; | |
3408 | my_waitpid (second_pid, &second_status, 0); | |
3409 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
3410 | if (ret != 0) | |
3411 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
3412 | my_waitpid (second_pid, &status, 0); | |
3413 | } | |
3414 | } | |
3415 | else | |
3416 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
3417 | "(%d, status 0x%x)", ret, status); | |
3418 | ||
3419 | do | |
3420 | { | |
3421 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
3422 | if (ret != 0) | |
3423 | warning ("linux_test_for_tracefork: failed to kill child"); | |
3424 | my_waitpid (child_pid, &status, 0); | |
3425 | } | |
3426 | while (WIFSTOPPED (status)); | |
51c2684e | 3427 | |
e4b7f41c | 3428 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 3429 | free (stack); |
e4b7f41c | 3430 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
3431 | } |
3432 | ||
3433 | ||
2f2893d9 DJ |
3434 | static void |
3435 | linux_look_up_symbols (void) | |
3436 | { | |
0d62e5e8 | 3437 | #ifdef USE_THREAD_DB |
95954743 PA |
3438 | struct process_info *proc = current_process (); |
3439 | ||
cdbfd419 | 3440 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
3441 | return; |
3442 | ||
6076632b DE |
3443 | /* If the kernel supports tracing forks then it also supports tracing |
3444 | clones, and then we don't need to use the magic thread event breakpoint | |
3445 | to learn about threads. */ | |
cdbfd419 | 3446 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
3447 | #endif |
3448 | } | |
3449 | ||
e5379b03 | 3450 | static void |
ef57601b | 3451 | linux_request_interrupt (void) |
e5379b03 | 3452 | { |
a1928bad | 3453 | extern unsigned long signal_pid; |
e5379b03 | 3454 | |
95954743 PA |
3455 | if (!ptid_equal (cont_thread, null_ptid) |
3456 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 3457 | { |
54a0b537 | 3458 | struct lwp_info *lwp; |
bd99dc85 | 3459 | int lwpid; |
e5379b03 | 3460 | |
54a0b537 | 3461 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
3462 | lwpid = lwpid_of (lwp); |
3463 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
3464 | } |
3465 | else | |
ef57601b | 3466 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
3467 | } |
3468 | ||
aa691b87 RM |
3469 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
3470 | to debugger memory starting at MYADDR. */ | |
3471 | ||
3472 | static int | |
f450004a | 3473 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
3474 | { |
3475 | char filename[PATH_MAX]; | |
3476 | int fd, n; | |
95954743 | 3477 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 3478 | |
95954743 | 3479 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
3480 | |
3481 | fd = open (filename, O_RDONLY); | |
3482 | if (fd < 0) | |
3483 | return -1; | |
3484 | ||
3485 | if (offset != (CORE_ADDR) 0 | |
3486 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
3487 | n = -1; | |
3488 | else | |
3489 | n = read (fd, myaddr, len); | |
3490 | ||
3491 | close (fd); | |
3492 | ||
3493 | return n; | |
3494 | } | |
3495 | ||
d993e290 PA |
3496 | /* These breakpoint and watchpoint related wrapper functions simply |
3497 | pass on the function call if the target has registered a | |
3498 | corresponding function. */ | |
e013ee27 OF |
3499 | |
3500 | static int | |
d993e290 | 3501 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 3502 | { |
d993e290 PA |
3503 | if (the_low_target.insert_point != NULL) |
3504 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
3505 | else |
3506 | /* Unsupported (see target.h). */ | |
3507 | return 1; | |
3508 | } | |
3509 | ||
3510 | static int | |
d993e290 | 3511 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 3512 | { |
d993e290 PA |
3513 | if (the_low_target.remove_point != NULL) |
3514 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
3515 | else |
3516 | /* Unsupported (see target.h). */ | |
3517 | return 1; | |
3518 | } | |
3519 | ||
3520 | static int | |
3521 | linux_stopped_by_watchpoint (void) | |
3522 | { | |
c3adc08c PA |
3523 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
3524 | ||
3525 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
3526 | } |
3527 | ||
3528 | static CORE_ADDR | |
3529 | linux_stopped_data_address (void) | |
3530 | { | |
c3adc08c PA |
3531 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
3532 | ||
3533 | return lwp->stopped_data_address; | |
e013ee27 OF |
3534 | } |
3535 | ||
42c81e2a | 3536 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
3537 | #if defined(__mcoldfire__) |
3538 | /* These should really be defined in the kernel's ptrace.h header. */ | |
3539 | #define PT_TEXT_ADDR 49*4 | |
3540 | #define PT_DATA_ADDR 50*4 | |
3541 | #define PT_TEXT_END_ADDR 51*4 | |
3542 | #endif | |
3543 | ||
3544 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
3545 | to tell gdb about. */ | |
3546 | ||
3547 | static int | |
3548 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
3549 | { | |
3550 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
3551 | unsigned long text, text_end, data; | |
bd99dc85 | 3552 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
3553 | |
3554 | errno = 0; | |
3555 | ||
3556 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
3557 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
3558 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
3559 | ||
3560 | if (errno == 0) | |
3561 | { | |
3562 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
3563 | used by gdb) are relative to the beginning of the program, |
3564 | with the data segment immediately following the text segment. | |
3565 | However, the actual runtime layout in memory may put the data | |
3566 | somewhere else, so when we send gdb a data base-address, we | |
3567 | use the real data base address and subtract the compile-time | |
3568 | data base-address from it (which is just the length of the | |
3569 | text segment). BSS immediately follows data in both | |
3570 | cases. */ | |
52fb6437 NS |
3571 | *text_p = text; |
3572 | *data_p = data - (text_end - text); | |
1b3f6016 | 3573 | |
52fb6437 NS |
3574 | return 1; |
3575 | } | |
3576 | #endif | |
3577 | return 0; | |
3578 | } | |
3579 | #endif | |
3580 | ||
dc146f7c VP |
3581 | static int |
3582 | compare_ints (const void *xa, const void *xb) | |
3583 | { | |
3584 | int a = *(const int *)xa; | |
3585 | int b = *(const int *)xb; | |
3586 | ||
3587 | return a - b; | |
3588 | } | |
3589 | ||
3590 | static int * | |
3591 | unique (int *b, int *e) | |
3592 | { | |
3593 | int *d = b; | |
3594 | while (++b != e) | |
3595 | if (*d != *b) | |
3596 | *++d = *b; | |
3597 | return ++d; | |
3598 | } | |
3599 | ||
3600 | /* Given PID, iterates over all threads in that process. | |
3601 | ||
3602 | Information about each thread, in a format suitable for qXfer:osdata:thread | |
3603 | is printed to BUFFER, if it's not NULL. BUFFER is assumed to be already | |
3604 | initialized, and the caller is responsible for finishing and appending '\0' | |
3605 | to it. | |
3606 | ||
3607 | The list of cores that threads are running on is assigned to *CORES, if it | |
3608 | is not NULL. If no cores are found, *CORES will be set to NULL. Caller | |
3609 | should free *CORES. */ | |
3610 | ||
3611 | static void | |
3612 | list_threads (int pid, struct buffer *buffer, char **cores) | |
3613 | { | |
3614 | int count = 0; | |
3615 | int allocated = 10; | |
3616 | int *core_numbers = xmalloc (sizeof (int) * allocated); | |
3617 | char pathname[128]; | |
3618 | DIR *dir; | |
3619 | struct dirent *dp; | |
3620 | struct stat statbuf; | |
3621 | ||
3622 | sprintf (pathname, "/proc/%d/task", pid); | |
3623 | if (stat (pathname, &statbuf) == 0 && S_ISDIR (statbuf.st_mode)) | |
3624 | { | |
3625 | dir = opendir (pathname); | |
3626 | if (!dir) | |
3627 | { | |
3628 | free (core_numbers); | |
3629 | return; | |
3630 | } | |
3631 | ||
3632 | while ((dp = readdir (dir)) != NULL) | |
3633 | { | |
3634 | unsigned long lwp = strtoul (dp->d_name, NULL, 10); | |
3635 | ||
3636 | if (lwp != 0) | |
3637 | { | |
3638 | unsigned core = linux_core_of_thread (ptid_build (pid, lwp, 0)); | |
3639 | ||
3640 | if (core != -1) | |
3641 | { | |
3642 | char s[sizeof ("4294967295")]; | |
3643 | sprintf (s, "%u", core); | |
3644 | ||
3645 | if (count == allocated) | |
3646 | { | |
3647 | allocated *= 2; | |
3648 | core_numbers = realloc (core_numbers, | |
3649 | sizeof (int) * allocated); | |
3650 | } | |
3651 | core_numbers[count++] = core; | |
3652 | if (buffer) | |
3653 | buffer_xml_printf (buffer, | |
3654 | "<item>" | |
3655 | "<column name=\"pid\">%d</column>" | |
3656 | "<column name=\"tid\">%s</column>" | |
3657 | "<column name=\"core\">%s</column>" | |
3658 | "</item>", pid, dp->d_name, s); | |
3659 | } | |
3660 | else | |
3661 | { | |
3662 | if (buffer) | |
3663 | buffer_xml_printf (buffer, | |
3664 | "<item>" | |
3665 | "<column name=\"pid\">%d</column>" | |
3666 | "<column name=\"tid\">%s</column>" | |
3667 | "</item>", pid, dp->d_name); | |
3668 | } | |
3669 | } | |
3670 | } | |
3671 | } | |
3672 | ||
3673 | if (cores) | |
3674 | { | |
3675 | *cores = NULL; | |
3676 | if (count > 0) | |
3677 | { | |
3678 | struct buffer buffer2; | |
3679 | int *b; | |
3680 | int *e; | |
3681 | qsort (core_numbers, count, sizeof (int), compare_ints); | |
3682 | ||
3683 | /* Remove duplicates. */ | |
3684 | b = core_numbers; | |
3685 | e = unique (b, core_numbers + count); | |
3686 | ||
3687 | buffer_init (&buffer2); | |
3688 | ||
3689 | for (b = core_numbers; b != e; ++b) | |
3690 | { | |
3691 | char number[sizeof ("4294967295")]; | |
3692 | sprintf (number, "%u", *b); | |
3693 | buffer_xml_printf (&buffer2, "%s%s", | |
3694 | (b == core_numbers) ? "" : ",", number); | |
3695 | } | |
3696 | buffer_grow_str0 (&buffer2, ""); | |
3697 | ||
3698 | *cores = buffer_finish (&buffer2); | |
3699 | } | |
3700 | } | |
3701 | free (core_numbers); | |
3702 | } | |
3703 | ||
3704 | static void | |
3705 | show_process (int pid, const char *username, struct buffer *buffer) | |
3706 | { | |
3707 | char pathname[128]; | |
3708 | FILE *f; | |
3709 | char cmd[MAXPATHLEN + 1]; | |
3710 | ||
3711 | sprintf (pathname, "/proc/%d/cmdline", pid); | |
3712 | ||
3713 | if ((f = fopen (pathname, "r")) != NULL) | |
3714 | { | |
3715 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
3716 | if (len > 0) | |
3717 | { | |
3718 | char *cores = 0; | |
3719 | int i; | |
3720 | for (i = 0; i < len; i++) | |
3721 | if (cmd[i] == '\0') | |
3722 | cmd[i] = ' '; | |
3723 | cmd[len] = '\0'; | |
3724 | ||
3725 | buffer_xml_printf (buffer, | |
3726 | "<item>" | |
3727 | "<column name=\"pid\">%d</column>" | |
3728 | "<column name=\"user\">%s</column>" | |
3729 | "<column name=\"command\">%s</column>", | |
3730 | pid, | |
3731 | username, | |
3732 | cmd); | |
3733 | ||
3734 | /* This only collects core numbers, and does not print threads. */ | |
3735 | list_threads (pid, NULL, &cores); | |
3736 | ||
3737 | if (cores) | |
3738 | { | |
3739 | buffer_xml_printf (buffer, | |
3740 | "<column name=\"cores\">%s</column>", cores); | |
3741 | free (cores); | |
3742 | } | |
3743 | ||
3744 | buffer_xml_printf (buffer, "</item>"); | |
3745 | } | |
3746 | fclose (f); | |
3747 | } | |
3748 | } | |
3749 | ||
07e059b5 VP |
3750 | static int |
3751 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
3752 | unsigned char *readbuf, unsigned const char *writebuf, |
3753 | CORE_ADDR offset, int len) | |
07e059b5 VP |
3754 | { |
3755 | /* We make the process list snapshot when the object starts to be | |
3756 | read. */ | |
3757 | static const char *buf; | |
3758 | static long len_avail = -1; | |
3759 | static struct buffer buffer; | |
dc146f7c VP |
3760 | int processes = 0; |
3761 | int threads = 0; | |
07e059b5 VP |
3762 | |
3763 | DIR *dirp; | |
3764 | ||
dc146f7c VP |
3765 | if (strcmp (annex, "processes") == 0) |
3766 | processes = 1; | |
3767 | else if (strcmp (annex, "threads") == 0) | |
3768 | threads = 1; | |
3769 | else | |
07e059b5 VP |
3770 | return 0; |
3771 | ||
3772 | if (!readbuf || writebuf) | |
3773 | return 0; | |
3774 | ||
3775 | if (offset == 0) | |
3776 | { | |
3777 | if (len_avail != -1 && len_avail != 0) | |
3778 | buffer_free (&buffer); | |
3779 | len_avail = 0; | |
3780 | buf = NULL; | |
3781 | buffer_init (&buffer); | |
dc146f7c VP |
3782 | if (processes) |
3783 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
3784 | else if (threads) | |
3785 | buffer_grow_str (&buffer, "<osdata type=\"threads\">"); | |
07e059b5 VP |
3786 | |
3787 | dirp = opendir ("/proc"); | |
3788 | if (dirp) | |
3789 | { | |
1b3f6016 PA |
3790 | struct dirent *dp; |
3791 | while ((dp = readdir (dirp)) != NULL) | |
3792 | { | |
3793 | struct stat statbuf; | |
3794 | char procentry[sizeof ("/proc/4294967295")]; | |
3795 | ||
3796 | if (!isdigit (dp->d_name[0]) | |
3797 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
3798 | continue; | |
3799 | ||
3800 | sprintf (procentry, "/proc/%s", dp->d_name); | |
3801 | if (stat (procentry, &statbuf) == 0 | |
3802 | && S_ISDIR (statbuf.st_mode)) | |
3803 | { | |
dc146f7c | 3804 | int pid = (int) strtoul (dp->d_name, NULL, 10); |
1b3f6016 | 3805 | |
dc146f7c | 3806 | if (processes) |
1b3f6016 | 3807 | { |
dc146f7c VP |
3808 | struct passwd *entry = getpwuid (statbuf.st_uid); |
3809 | show_process (pid, entry ? entry->pw_name : "?", &buffer); | |
3810 | } | |
3811 | else if (threads) | |
3812 | { | |
3813 | list_threads (pid, &buffer, NULL); | |
1b3f6016 PA |
3814 | } |
3815 | } | |
3816 | } | |
07e059b5 | 3817 | |
1b3f6016 | 3818 | closedir (dirp); |
07e059b5 VP |
3819 | } |
3820 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
3821 | buf = buffer_finish (&buffer); | |
3822 | len_avail = strlen (buf); | |
3823 | } | |
3824 | ||
3825 | if (offset >= len_avail) | |
3826 | { | |
3827 | /* Done. Get rid of the data. */ | |
3828 | buffer_free (&buffer); | |
3829 | buf = NULL; | |
3830 | len_avail = 0; | |
3831 | return 0; | |
3832 | } | |
3833 | ||
3834 | if (len > len_avail - offset) | |
3835 | len = len_avail - offset; | |
3836 | memcpy (readbuf, buf + offset, len); | |
3837 | ||
3838 | return len; | |
3839 | } | |
3840 | ||
d0722149 DE |
3841 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3842 | layout of the inferiors' architecture. */ | |
3843 | ||
3844 | static void | |
3845 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
3846 | { | |
3847 | int done = 0; | |
3848 | ||
3849 | if (the_low_target.siginfo_fixup != NULL) | |
3850 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
3851 | ||
3852 | /* If there was no callback, or the callback didn't do anything, | |
3853 | then just do a straight memcpy. */ | |
3854 | if (!done) | |
3855 | { | |
3856 | if (direction == 1) | |
3857 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3858 | else | |
3859 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3860 | } | |
3861 | } | |
3862 | ||
4aa995e1 PA |
3863 | static int |
3864 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
3865 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
3866 | { | |
d0722149 | 3867 | int pid; |
4aa995e1 | 3868 | struct siginfo siginfo; |
d0722149 | 3869 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3870 | |
3871 | if (current_inferior == NULL) | |
3872 | return -1; | |
3873 | ||
bd99dc85 | 3874 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
3875 | |
3876 | if (debug_threads) | |
d0722149 | 3877 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
3878 | readbuf != NULL ? "Reading" : "Writing", |
3879 | pid); | |
3880 | ||
3881 | if (offset > sizeof (siginfo)) | |
3882 | return -1; | |
3883 | ||
3884 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
3885 | return -1; | |
3886 | ||
d0722149 DE |
3887 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
3888 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3889 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
3890 | with a 32-bit GDBSERVER, we need to convert it. */ | |
3891 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3892 | ||
4aa995e1 PA |
3893 | if (offset + len > sizeof (siginfo)) |
3894 | len = sizeof (siginfo) - offset; | |
3895 | ||
3896 | if (readbuf != NULL) | |
d0722149 | 3897 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3898 | else |
3899 | { | |
d0722149 DE |
3900 | memcpy (inf_siginfo + offset, writebuf, len); |
3901 | ||
3902 | /* Convert back to ptrace layout before flushing it out. */ | |
3903 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3904 | ||
4aa995e1 PA |
3905 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
3906 | return -1; | |
3907 | } | |
3908 | ||
3909 | return len; | |
3910 | } | |
3911 | ||
bd99dc85 PA |
3912 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
3913 | so we notice when children change state; as the handler for the | |
3914 | sigsuspend in my_waitpid. */ | |
3915 | ||
3916 | static void | |
3917 | sigchld_handler (int signo) | |
3918 | { | |
3919 | int old_errno = errno; | |
3920 | ||
3921 | if (debug_threads) | |
3922 | /* fprintf is not async-signal-safe, so call write directly. */ | |
3923 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
3924 | ||
3925 | if (target_is_async_p ()) | |
3926 | async_file_mark (); /* trigger a linux_wait */ | |
3927 | ||
3928 | errno = old_errno; | |
3929 | } | |
3930 | ||
3931 | static int | |
3932 | linux_supports_non_stop (void) | |
3933 | { | |
3934 | return 1; | |
3935 | } | |
3936 | ||
3937 | static int | |
3938 | linux_async (int enable) | |
3939 | { | |
3940 | int previous = (linux_event_pipe[0] != -1); | |
3941 | ||
3942 | if (previous != enable) | |
3943 | { | |
3944 | sigset_t mask; | |
3945 | sigemptyset (&mask); | |
3946 | sigaddset (&mask, SIGCHLD); | |
3947 | ||
3948 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
3949 | ||
3950 | if (enable) | |
3951 | { | |
3952 | if (pipe (linux_event_pipe) == -1) | |
3953 | fatal ("creating event pipe failed."); | |
3954 | ||
3955 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
3956 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
3957 | ||
3958 | /* Register the event loop handler. */ | |
3959 | add_file_handler (linux_event_pipe[0], | |
3960 | handle_target_event, NULL); | |
3961 | ||
3962 | /* Always trigger a linux_wait. */ | |
3963 | async_file_mark (); | |
3964 | } | |
3965 | else | |
3966 | { | |
3967 | delete_file_handler (linux_event_pipe[0]); | |
3968 | ||
3969 | close (linux_event_pipe[0]); | |
3970 | close (linux_event_pipe[1]); | |
3971 | linux_event_pipe[0] = -1; | |
3972 | linux_event_pipe[1] = -1; | |
3973 | } | |
3974 | ||
3975 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
3976 | } | |
3977 | ||
3978 | return previous; | |
3979 | } | |
3980 | ||
3981 | static int | |
3982 | linux_start_non_stop (int nonstop) | |
3983 | { | |
3984 | /* Register or unregister from event-loop accordingly. */ | |
3985 | linux_async (nonstop); | |
3986 | return 0; | |
3987 | } | |
3988 | ||
cf8fd78b PA |
3989 | static int |
3990 | linux_supports_multi_process (void) | |
3991 | { | |
3992 | return 1; | |
3993 | } | |
3994 | ||
efcbbd14 UW |
3995 | |
3996 | /* Enumerate spufs IDs for process PID. */ | |
3997 | static int | |
3998 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
3999 | { | |
4000 | int pos = 0; | |
4001 | int written = 0; | |
4002 | char path[128]; | |
4003 | DIR *dir; | |
4004 | struct dirent *entry; | |
4005 | ||
4006 | sprintf (path, "/proc/%ld/fd", pid); | |
4007 | dir = opendir (path); | |
4008 | if (!dir) | |
4009 | return -1; | |
4010 | ||
4011 | rewinddir (dir); | |
4012 | while ((entry = readdir (dir)) != NULL) | |
4013 | { | |
4014 | struct stat st; | |
4015 | struct statfs stfs; | |
4016 | int fd; | |
4017 | ||
4018 | fd = atoi (entry->d_name); | |
4019 | if (!fd) | |
4020 | continue; | |
4021 | ||
4022 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4023 | if (stat (path, &st) != 0) | |
4024 | continue; | |
4025 | if (!S_ISDIR (st.st_mode)) | |
4026 | continue; | |
4027 | ||
4028 | if (statfs (path, &stfs) != 0) | |
4029 | continue; | |
4030 | if (stfs.f_type != SPUFS_MAGIC) | |
4031 | continue; | |
4032 | ||
4033 | if (pos >= offset && pos + 4 <= offset + len) | |
4034 | { | |
4035 | *(unsigned int *)(buf + pos - offset) = fd; | |
4036 | written += 4; | |
4037 | } | |
4038 | pos += 4; | |
4039 | } | |
4040 | ||
4041 | closedir (dir); | |
4042 | return written; | |
4043 | } | |
4044 | ||
4045 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4046 | object type, using the /proc file system. */ | |
4047 | static int | |
4048 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4049 | unsigned const char *writebuf, | |
4050 | CORE_ADDR offset, int len) | |
4051 | { | |
4052 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4053 | char buf[128]; | |
4054 | int fd = 0; | |
4055 | int ret = 0; | |
4056 | ||
4057 | if (!writebuf && !readbuf) | |
4058 | return -1; | |
4059 | ||
4060 | if (!*annex) | |
4061 | { | |
4062 | if (!readbuf) | |
4063 | return -1; | |
4064 | else | |
4065 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4066 | } | |
4067 | ||
4068 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
4069 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4070 | if (fd <= 0) | |
4071 | return -1; | |
4072 | ||
4073 | if (offset != 0 | |
4074 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4075 | { | |
4076 | close (fd); | |
4077 | return 0; | |
4078 | } | |
4079 | ||
4080 | if (writebuf) | |
4081 | ret = write (fd, writebuf, (size_t) len); | |
4082 | else | |
4083 | ret = read (fd, readbuf, (size_t) len); | |
4084 | ||
4085 | close (fd); | |
4086 | return ret; | |
4087 | } | |
4088 | ||
dc146f7c VP |
4089 | static int |
4090 | linux_core_of_thread (ptid_t ptid) | |
4091 | { | |
4092 | char filename[sizeof ("/proc//task//stat") | |
4093 | + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */ | |
4094 | + 1]; | |
4095 | FILE *f; | |
4096 | char *content = NULL; | |
4097 | char *p; | |
4098 | char *ts = 0; | |
4099 | int content_read = 0; | |
4100 | int i; | |
4101 | int core; | |
4102 | ||
4103 | sprintf (filename, "/proc/%d/task/%ld/stat", | |
4104 | ptid_get_pid (ptid), ptid_get_lwp (ptid)); | |
4105 | f = fopen (filename, "r"); | |
4106 | if (!f) | |
4107 | return -1; | |
4108 | ||
4109 | for (;;) | |
4110 | { | |
4111 | int n; | |
4112 | content = realloc (content, content_read + 1024); | |
4113 | n = fread (content + content_read, 1, 1024, f); | |
4114 | content_read += n; | |
4115 | if (n < 1024) | |
4116 | { | |
4117 | content[content_read] = '\0'; | |
4118 | break; | |
4119 | } | |
4120 | } | |
4121 | ||
4122 | p = strchr (content, '('); | |
4123 | p = strchr (p, ')') + 2; /* skip ")" and a whitespace. */ | |
4124 | ||
4125 | p = strtok_r (p, " ", &ts); | |
4126 | for (i = 0; i != 36; ++i) | |
4127 | p = strtok_r (NULL, " ", &ts); | |
4128 | ||
4129 | if (sscanf (p, "%d", &core) == 0) | |
4130 | core = -1; | |
4131 | ||
4132 | free (content); | |
4133 | fclose (f); | |
4134 | ||
4135 | return core; | |
4136 | } | |
4137 | ||
ce3a066d DJ |
4138 | static struct target_ops linux_target_ops = { |
4139 | linux_create_inferior, | |
4140 | linux_attach, | |
4141 | linux_kill, | |
6ad8ae5c | 4142 | linux_detach, |
444d6139 | 4143 | linux_join, |
ce3a066d DJ |
4144 | linux_thread_alive, |
4145 | linux_resume, | |
4146 | linux_wait, | |
4147 | linux_fetch_registers, | |
4148 | linux_store_registers, | |
4149 | linux_read_memory, | |
4150 | linux_write_memory, | |
2f2893d9 | 4151 | linux_look_up_symbols, |
ef57601b | 4152 | linux_request_interrupt, |
aa691b87 | 4153 | linux_read_auxv, |
d993e290 PA |
4154 | linux_insert_point, |
4155 | linux_remove_point, | |
e013ee27 OF |
4156 | linux_stopped_by_watchpoint, |
4157 | linux_stopped_data_address, | |
42c81e2a | 4158 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 4159 | linux_read_offsets, |
dae5f5cf DJ |
4160 | #else |
4161 | NULL, | |
4162 | #endif | |
4163 | #ifdef USE_THREAD_DB | |
4164 | thread_db_get_tls_address, | |
4165 | #else | |
4166 | NULL, | |
52fb6437 | 4167 | #endif |
efcbbd14 | 4168 | linux_qxfer_spu, |
59a016f0 | 4169 | hostio_last_error_from_errno, |
07e059b5 | 4170 | linux_qxfer_osdata, |
4aa995e1 | 4171 | linux_xfer_siginfo, |
bd99dc85 PA |
4172 | linux_supports_non_stop, |
4173 | linux_async, | |
4174 | linux_start_non_stop, | |
cdbfd419 PP |
4175 | linux_supports_multi_process, |
4176 | #ifdef USE_THREAD_DB | |
dc146f7c | 4177 | thread_db_handle_monitor_command, |
cdbfd419 | 4178 | #else |
dc146f7c | 4179 | NULL, |
cdbfd419 | 4180 | #endif |
dc146f7c | 4181 | linux_core_of_thread |
ce3a066d DJ |
4182 | }; |
4183 | ||
0d62e5e8 DJ |
4184 | static void |
4185 | linux_init_signals () | |
4186 | { | |
4187 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
4188 | to find what the cancel signal actually is. */ | |
60c3d7b0 | 4189 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 4190 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 4191 | #endif |
0d62e5e8 DJ |
4192 | } |
4193 | ||
da6d8c04 DJ |
4194 | void |
4195 | initialize_low (void) | |
4196 | { | |
bd99dc85 PA |
4197 | struct sigaction sigchld_action; |
4198 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 4199 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
4200 | set_breakpoint_data (the_low_target.breakpoint, |
4201 | the_low_target.breakpoint_len); | |
0d62e5e8 | 4202 | linux_init_signals (); |
24a09b5f | 4203 | linux_test_for_tracefork (); |
52fa2412 UW |
4204 | #ifdef HAVE_LINUX_REGSETS |
4205 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
4206 | ; | |
bca929d3 | 4207 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 4208 | #endif |
bd99dc85 PA |
4209 | |
4210 | sigchld_action.sa_handler = sigchld_handler; | |
4211 | sigemptyset (&sigchld_action.sa_mask); | |
4212 | sigchld_action.sa_flags = SA_RESTART; | |
4213 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 4214 | } |