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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
0b302171 | 2 | Copyright (C) 1995-1996, 1998-2012 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
d26e3629 | 21 | #include "linux-osdata.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> |
af96c192 | 27 | #include "linux-ptrace.h" |
e3deef73 | 28 | #include "linux-procfs.h" |
da6d8c04 DJ |
29 | #include <signal.h> |
30 | #include <sys/ioctl.h> | |
31 | #include <fcntl.h> | |
d07c63e7 | 32 | #include <string.h> |
0a30fbc4 DJ |
33 | #include <stdlib.h> |
34 | #include <unistd.h> | |
fa6a77dc | 35 | #include <errno.h> |
fd500816 | 36 | #include <sys/syscall.h> |
f9387fc3 | 37 | #include <sched.h> |
07e059b5 VP |
38 | #include <ctype.h> |
39 | #include <pwd.h> | |
40 | #include <sys/types.h> | |
41 | #include <dirent.h> | |
efcbbd14 UW |
42 | #include <sys/stat.h> |
43 | #include <sys/vfs.h> | |
1570b33e | 44 | #include <sys/uio.h> |
957f3f49 DE |
45 | #ifndef ELFMAG0 |
46 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
47 | then ELFMAG0 will have been defined. If it didn't get included by | |
48 | gdb_proc_service.h then including it will likely introduce a duplicate | |
49 | definition of elf_fpregset_t. */ | |
50 | #include <elf.h> | |
51 | #endif | |
efcbbd14 UW |
52 | |
53 | #ifndef SPUFS_MAGIC | |
54 | #define SPUFS_MAGIC 0x23c9b64e | |
55 | #endif | |
da6d8c04 | 56 | |
03583c20 UW |
57 | #ifdef HAVE_PERSONALITY |
58 | # include <sys/personality.h> | |
59 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
60 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
61 | # endif | |
62 | #endif | |
63 | ||
fd462a61 DJ |
64 | #ifndef O_LARGEFILE |
65 | #define O_LARGEFILE 0 | |
66 | #endif | |
67 | ||
ec8ebe72 DE |
68 | #ifndef W_STOPCODE |
69 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
70 | #endif | |
71 | ||
1a981360 PA |
72 | /* This is the kernel's hard limit. Not to be confused with |
73 | SIGRTMIN. */ | |
74 | #ifndef __SIGRTMIN | |
75 | #define __SIGRTMIN 32 | |
76 | #endif | |
77 | ||
42c81e2a DJ |
78 | #ifdef __UCLIBC__ |
79 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
80 | #define HAS_NOMMU | |
81 | #endif | |
82 | #endif | |
83 | ||
24a09b5f DJ |
84 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
85 | representation of the thread ID. | |
611cb4a5 | 86 | |
54a0b537 | 87 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
88 | the same as the LWP ID. |
89 | ||
90 | ``all_processes'' is keyed by the "overall process ID", which | |
91 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 92 | |
54a0b537 | 93 | struct inferior_list all_lwps; |
0d62e5e8 | 94 | |
24a09b5f DJ |
95 | /* A list of all unknown processes which receive stop signals. Some other |
96 | process will presumably claim each of these as forked children | |
97 | momentarily. */ | |
98 | ||
99 | struct inferior_list stopped_pids; | |
100 | ||
0d62e5e8 DJ |
101 | /* FIXME this is a bit of a hack, and could be removed. */ |
102 | int stopping_threads; | |
103 | ||
104 | /* FIXME make into a target method? */ | |
24a09b5f | 105 | int using_threads = 1; |
24a09b5f | 106 | |
fa593d66 PA |
107 | /* True if we're presently stabilizing threads (moving them out of |
108 | jump pads). */ | |
109 | static int stabilizing_threads; | |
110 | ||
95954743 PA |
111 | /* This flag is true iff we've just created or attached to our first |
112 | inferior but it has not stopped yet. As soon as it does, we need | |
113 | to call the low target's arch_setup callback. Doing this only on | |
114 | the first inferior avoids reinializing the architecture on every | |
115 | inferior, and avoids messing with the register caches of the | |
116 | already running inferiors. NOTE: this assumes all inferiors under | |
117 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
118 | static int new_inferior; |
119 | ||
2acc282a | 120 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 121 | int step, int signal, siginfo_t *info); |
2bd7c093 | 122 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
123 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
124 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 125 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 126 | static void *add_lwp (ptid_t ptid); |
c35fafde | 127 | static int linux_stopped_by_watchpoint (void); |
95954743 | 128 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 129 | static void proceed_all_lwps (void); |
d50171e4 PA |
130 | static int finish_step_over (struct lwp_info *lwp); |
131 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
132 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 133 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
134 | |
135 | /* True if the low target can hardware single-step. Such targets | |
136 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
137 | ||
138 | static int | |
139 | can_hardware_single_step (void) | |
140 | { | |
141 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
142 | } | |
143 | ||
144 | /* True if the low target supports memory breakpoints. If so, we'll | |
145 | have a GET_PC implementation. */ | |
146 | ||
147 | static int | |
148 | supports_breakpoints (void) | |
149 | { | |
150 | return (the_low_target.get_pc != NULL); | |
151 | } | |
0d62e5e8 | 152 | |
fa593d66 PA |
153 | /* Returns true if this target can support fast tracepoints. This |
154 | does not mean that the in-process agent has been loaded in the | |
155 | inferior. */ | |
156 | ||
157 | static int | |
158 | supports_fast_tracepoints (void) | |
159 | { | |
160 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
161 | } | |
162 | ||
0d62e5e8 DJ |
163 | struct pending_signals |
164 | { | |
165 | int signal; | |
32ca6d61 | 166 | siginfo_t info; |
0d62e5e8 DJ |
167 | struct pending_signals *prev; |
168 | }; | |
611cb4a5 | 169 | |
14ce3065 DE |
170 | #define PTRACE_ARG3_TYPE void * |
171 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 172 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 173 | |
58caa3dc | 174 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
175 | static char *disabled_regsets; |
176 | static int num_regsets; | |
58caa3dc DJ |
177 | #endif |
178 | ||
bd99dc85 PA |
179 | /* The read/write ends of the pipe registered as waitable file in the |
180 | event loop. */ | |
181 | static int linux_event_pipe[2] = { -1, -1 }; | |
182 | ||
183 | /* True if we're currently in async mode. */ | |
184 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
185 | ||
02fc4de7 | 186 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
187 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
188 | ||
d0722149 DE |
189 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
190 | ||
191 | static int | |
957f3f49 | 192 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
193 | { |
194 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
195 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
196 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
197 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
198 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
199 | } | |
200 | ||
201 | /* Return non-zero if FILE is a 64-bit ELF file, | |
202 | zero if the file is not a 64-bit ELF file, | |
203 | and -1 if the file is not accessible or doesn't exist. */ | |
204 | ||
be07f1a2 | 205 | static int |
d0722149 DE |
206 | elf_64_file_p (const char *file) |
207 | { | |
957f3f49 | 208 | Elf64_Ehdr header; |
d0722149 DE |
209 | int fd; |
210 | ||
211 | fd = open (file, O_RDONLY); | |
212 | if (fd < 0) | |
213 | return -1; | |
214 | ||
215 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
216 | { | |
217 | close (fd); | |
218 | return 0; | |
219 | } | |
220 | close (fd); | |
221 | ||
222 | return elf_64_header_p (&header); | |
223 | } | |
224 | ||
be07f1a2 PA |
225 | /* Accepts an integer PID; Returns true if the executable PID is |
226 | running is a 64-bit ELF file.. */ | |
227 | ||
228 | int | |
229 | linux_pid_exe_is_elf_64_file (int pid) | |
230 | { | |
231 | char file[MAXPATHLEN]; | |
232 | ||
233 | sprintf (file, "/proc/%d/exe", pid); | |
234 | return elf_64_file_p (file); | |
235 | } | |
236 | ||
bd99dc85 PA |
237 | static void |
238 | delete_lwp (struct lwp_info *lwp) | |
239 | { | |
240 | remove_thread (get_lwp_thread (lwp)); | |
241 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 242 | free (lwp->arch_private); |
bd99dc85 PA |
243 | free (lwp); |
244 | } | |
245 | ||
95954743 PA |
246 | /* Add a process to the common process list, and set its private |
247 | data. */ | |
248 | ||
249 | static struct process_info * | |
250 | linux_add_process (int pid, int attached) | |
251 | { | |
252 | struct process_info *proc; | |
253 | ||
254 | /* Is this the first process? If so, then set the arch. */ | |
255 | if (all_processes.head == NULL) | |
256 | new_inferior = 1; | |
257 | ||
258 | proc = add_process (pid, attached); | |
259 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
260 | ||
aa5ca48f DE |
261 | if (the_low_target.new_process != NULL) |
262 | proc->private->arch_private = the_low_target.new_process (); | |
263 | ||
95954743 PA |
264 | return proc; |
265 | } | |
266 | ||
07d4f67e DE |
267 | /* Wrapper function for waitpid which handles EINTR, and emulates |
268 | __WALL for systems where that is not available. */ | |
269 | ||
270 | static int | |
271 | my_waitpid (int pid, int *status, int flags) | |
272 | { | |
273 | int ret, out_errno; | |
274 | ||
275 | if (debug_threads) | |
276 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
277 | ||
278 | if (flags & __WALL) | |
279 | { | |
280 | sigset_t block_mask, org_mask, wake_mask; | |
281 | int wnohang; | |
282 | ||
283 | wnohang = (flags & WNOHANG) != 0; | |
284 | flags &= ~(__WALL | __WCLONE); | |
285 | flags |= WNOHANG; | |
286 | ||
287 | /* Block all signals while here. This avoids knowing about | |
288 | LinuxThread's signals. */ | |
289 | sigfillset (&block_mask); | |
290 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
291 | ||
292 | /* ... except during the sigsuspend below. */ | |
293 | sigemptyset (&wake_mask); | |
294 | ||
295 | while (1) | |
296 | { | |
297 | /* Since all signals are blocked, there's no need to check | |
298 | for EINTR here. */ | |
299 | ret = waitpid (pid, status, flags); | |
300 | out_errno = errno; | |
301 | ||
302 | if (ret == -1 && out_errno != ECHILD) | |
303 | break; | |
304 | else if (ret > 0) | |
305 | break; | |
306 | ||
307 | if (flags & __WCLONE) | |
308 | { | |
309 | /* We've tried both flavors now. If WNOHANG is set, | |
310 | there's nothing else to do, just bail out. */ | |
311 | if (wnohang) | |
312 | break; | |
313 | ||
314 | if (debug_threads) | |
315 | fprintf (stderr, "blocking\n"); | |
316 | ||
317 | /* Block waiting for signals. */ | |
318 | sigsuspend (&wake_mask); | |
319 | } | |
320 | ||
321 | flags ^= __WCLONE; | |
322 | } | |
323 | ||
324 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
325 | } | |
326 | else | |
327 | { | |
328 | do | |
329 | ret = waitpid (pid, status, flags); | |
330 | while (ret == -1 && errno == EINTR); | |
331 | out_errno = errno; | |
332 | } | |
333 | ||
334 | if (debug_threads) | |
335 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
336 | pid, flags, status ? *status : -1, ret); | |
337 | ||
338 | errno = out_errno; | |
339 | return ret; | |
340 | } | |
341 | ||
bd99dc85 PA |
342 | /* Handle a GNU/Linux extended wait response. If we see a clone |
343 | event, we need to add the new LWP to our list (and not report the | |
344 | trap to higher layers). */ | |
0d62e5e8 | 345 | |
24a09b5f | 346 | static void |
54a0b537 | 347 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
348 | { |
349 | int event = wstat >> 16; | |
54a0b537 | 350 | struct lwp_info *new_lwp; |
24a09b5f DJ |
351 | |
352 | if (event == PTRACE_EVENT_CLONE) | |
353 | { | |
95954743 | 354 | ptid_t ptid; |
24a09b5f | 355 | unsigned long new_pid; |
836acd6d | 356 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 357 | |
bd99dc85 | 358 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
359 | |
360 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
361 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
362 | { | |
363 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
364 | hits the SIGSTOP, but we're already attached. */ | |
365 | ||
97438e3f | 366 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
367 | |
368 | if (ret == -1) | |
369 | perror_with_name ("waiting for new child"); | |
370 | else if (ret != new_pid) | |
371 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 372 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
373 | warning ("wait returned unexpected status 0x%x", status); |
374 | } | |
375 | ||
1e7fc18c | 376 | linux_enable_event_reporting (new_pid); |
24a09b5f | 377 | |
95954743 PA |
378 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
379 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
380 | add_thread (ptid, new_lwp); | |
24a09b5f | 381 | |
e27d73f6 DE |
382 | /* Either we're going to immediately resume the new thread |
383 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
384 | thinks the thread is currently running, so set this first | |
385 | before calling linux_resume_one_lwp. */ | |
386 | new_lwp->stopped = 1; | |
387 | ||
da5898ce DJ |
388 | /* Normally we will get the pending SIGSTOP. But in some cases |
389 | we might get another signal delivered to the group first. | |
f21cc1a2 | 390 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
391 | if (WSTOPSIG (status) == SIGSTOP) |
392 | { | |
d50171e4 PA |
393 | if (stopping_threads) |
394 | new_lwp->stop_pc = get_stop_pc (new_lwp); | |
395 | else | |
e27d73f6 | 396 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 397 | } |
24a09b5f | 398 | else |
da5898ce | 399 | { |
54a0b537 | 400 | new_lwp->stop_expected = 1; |
d50171e4 | 401 | |
da5898ce DJ |
402 | if (stopping_threads) |
403 | { | |
d50171e4 | 404 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
405 | new_lwp->status_pending_p = 1; |
406 | new_lwp->status_pending = status; | |
da5898ce DJ |
407 | } |
408 | else | |
409 | /* Pass the signal on. This is what GDB does - except | |
410 | shouldn't we really report it instead? */ | |
e27d73f6 | 411 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 412 | } |
24a09b5f DJ |
413 | |
414 | /* Always resume the current thread. If we are stopping | |
415 | threads, it will have a pending SIGSTOP; we may as well | |
416 | collect it now. */ | |
2acc282a | 417 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
418 | } |
419 | } | |
420 | ||
d50171e4 PA |
421 | /* Return the PC as read from the regcache of LWP, without any |
422 | adjustment. */ | |
423 | ||
424 | static CORE_ADDR | |
425 | get_pc (struct lwp_info *lwp) | |
426 | { | |
427 | struct thread_info *saved_inferior; | |
428 | struct regcache *regcache; | |
429 | CORE_ADDR pc; | |
430 | ||
431 | if (the_low_target.get_pc == NULL) | |
432 | return 0; | |
433 | ||
434 | saved_inferior = current_inferior; | |
435 | current_inferior = get_lwp_thread (lwp); | |
436 | ||
437 | regcache = get_thread_regcache (current_inferior, 1); | |
438 | pc = (*the_low_target.get_pc) (regcache); | |
439 | ||
440 | if (debug_threads) | |
441 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
442 | ||
443 | current_inferior = saved_inferior; | |
444 | return pc; | |
445 | } | |
446 | ||
447 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
448 | The SIGTRAP could mean several things. |
449 | ||
450 | On i386, where decr_pc_after_break is non-zero: | |
451 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
452 | we will get only the one SIGTRAP (even if the instruction we | |
453 | stepped over was a breakpoint). The value of $eip will be the | |
454 | next instruction. | |
455 | If we continue the process using PTRACE_CONT, we will get a | |
456 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
457 | the instruction after the breakpoint (i.e. needs to be | |
458 | decremented). If we report the SIGTRAP to GDB, we must also | |
459 | report the undecremented PC. If we cancel the SIGTRAP, we | |
460 | must resume at the decremented PC. | |
461 | ||
462 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
463 | with hardware or kernel single-step: | |
464 | If we single-step over a breakpoint instruction, our PC will | |
465 | point at the following instruction. If we continue and hit a | |
466 | breakpoint instruction, our PC will point at the breakpoint | |
467 | instruction. */ | |
468 | ||
469 | static CORE_ADDR | |
d50171e4 | 470 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 471 | { |
d50171e4 PA |
472 | CORE_ADDR stop_pc; |
473 | ||
474 | if (the_low_target.get_pc == NULL) | |
475 | return 0; | |
0d62e5e8 | 476 | |
d50171e4 PA |
477 | stop_pc = get_pc (lwp); |
478 | ||
bdabb078 PA |
479 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
480 | && !lwp->stepping | |
481 | && !lwp->stopped_by_watchpoint | |
482 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
483 | stop_pc -= the_low_target.decr_pc_after_break; |
484 | ||
485 | if (debug_threads) | |
486 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
487 | ||
488 | return stop_pc; | |
0d62e5e8 | 489 | } |
ce3a066d | 490 | |
0d62e5e8 | 491 | static void * |
95954743 | 492 | add_lwp (ptid_t ptid) |
611cb4a5 | 493 | { |
54a0b537 | 494 | struct lwp_info *lwp; |
0d62e5e8 | 495 | |
54a0b537 PA |
496 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
497 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 498 | |
95954743 | 499 | lwp->head.id = ptid; |
0d62e5e8 | 500 | |
aa5ca48f DE |
501 | if (the_low_target.new_thread != NULL) |
502 | lwp->arch_private = the_low_target.new_thread (); | |
503 | ||
54a0b537 | 504 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 505 | |
54a0b537 | 506 | return lwp; |
0d62e5e8 | 507 | } |
611cb4a5 | 508 | |
da6d8c04 DJ |
509 | /* Start an inferior process and returns its pid. |
510 | ALLARGS is a vector of program-name and args. */ | |
511 | ||
ce3a066d DJ |
512 | static int |
513 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 514 | { |
03583c20 UW |
515 | #ifdef HAVE_PERSONALITY |
516 | int personality_orig = 0, personality_set = 0; | |
517 | #endif | |
a6dbe5df | 518 | struct lwp_info *new_lwp; |
da6d8c04 | 519 | int pid; |
95954743 | 520 | ptid_t ptid; |
da6d8c04 | 521 | |
03583c20 UW |
522 | #ifdef HAVE_PERSONALITY |
523 | if (disable_randomization) | |
524 | { | |
525 | errno = 0; | |
526 | personality_orig = personality (0xffffffff); | |
527 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
528 | { | |
529 | personality_set = 1; | |
530 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
531 | } | |
532 | if (errno != 0 || (personality_set | |
533 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
534 | warning ("Error disabling address space randomization: %s", | |
535 | strerror (errno)); | |
536 | } | |
537 | #endif | |
538 | ||
42c81e2a | 539 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
540 | pid = vfork (); |
541 | #else | |
da6d8c04 | 542 | pid = fork (); |
52fb6437 | 543 | #endif |
da6d8c04 DJ |
544 | if (pid < 0) |
545 | perror_with_name ("fork"); | |
546 | ||
547 | if (pid == 0) | |
548 | { | |
549 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
550 | ||
1a981360 | 551 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 552 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 553 | #endif |
0d62e5e8 | 554 | |
a9fa9f7d DJ |
555 | setpgid (0, 0); |
556 | ||
e0f9f062 DE |
557 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
558 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
559 | Also, redirect stdin to /dev/null. */ | |
560 | if (remote_connection_is_stdio ()) | |
561 | { | |
562 | close (0); | |
563 | open ("/dev/null", O_RDONLY); | |
564 | dup2 (2, 1); | |
3e52c33d JK |
565 | if (write (2, "stdin/stdout redirected\n", |
566 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
567 | /* Errors ignored. */; | |
e0f9f062 DE |
568 | } |
569 | ||
2b876972 DJ |
570 | execv (program, allargs); |
571 | if (errno == ENOENT) | |
572 | execvp (program, allargs); | |
da6d8c04 DJ |
573 | |
574 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 575 | strerror (errno)); |
da6d8c04 DJ |
576 | fflush (stderr); |
577 | _exit (0177); | |
578 | } | |
579 | ||
03583c20 UW |
580 | #ifdef HAVE_PERSONALITY |
581 | if (personality_set) | |
582 | { | |
583 | errno = 0; | |
584 | personality (personality_orig); | |
585 | if (errno != 0) | |
586 | warning ("Error restoring address space randomization: %s", | |
587 | strerror (errno)); | |
588 | } | |
589 | #endif | |
590 | ||
95954743 PA |
591 | linux_add_process (pid, 0); |
592 | ||
593 | ptid = ptid_build (pid, pid, 0); | |
594 | new_lwp = add_lwp (ptid); | |
595 | add_thread (ptid, new_lwp); | |
a6dbe5df | 596 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 597 | |
a9fa9f7d | 598 | return pid; |
da6d8c04 DJ |
599 | } |
600 | ||
c14d7ab2 PA |
601 | /* Detect `T (stopped)' in `/proc/PID/status'. |
602 | Other states including `T (tracing stop)' are reported as false. */ | |
603 | ||
604 | static int | |
605 | pid_is_stopped (pid_t pid) | |
606 | { | |
607 | FILE *status_file; | |
608 | char buf[100]; | |
609 | int retval = 0; | |
610 | ||
611 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
612 | status_file = fopen (buf, "r"); | |
613 | if (status_file != NULL) | |
614 | { | |
615 | int have_state = 0; | |
616 | ||
617 | while (fgets (buf, sizeof (buf), status_file)) | |
618 | { | |
619 | if (strncmp (buf, "State:", 6) == 0) | |
620 | { | |
621 | have_state = 1; | |
622 | break; | |
623 | } | |
624 | } | |
625 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
626 | retval = 1; | |
627 | fclose (status_file); | |
628 | } | |
629 | return retval; | |
630 | } | |
631 | ||
da6d8c04 DJ |
632 | /* Attach to an inferior process. */ |
633 | ||
95954743 PA |
634 | static void |
635 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 636 | { |
95954743 | 637 | ptid_t ptid; |
54a0b537 | 638 | struct lwp_info *new_lwp; |
611cb4a5 | 639 | |
95954743 | 640 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 641 | { |
95954743 | 642 | if (!initial) |
2d717e4f DJ |
643 | { |
644 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 645 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
646 | strerror (errno), errno); |
647 | fflush (stderr); | |
648 | return; | |
649 | } | |
650 | else | |
651 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 652 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 653 | strerror (errno), errno); |
da6d8c04 DJ |
654 | } |
655 | ||
95954743 | 656 | if (initial) |
e3deef73 LM |
657 | /* If lwp is the tgid, we handle adding existing threads later. |
658 | Otherwise we just add lwp without bothering about any other | |
659 | threads. */ | |
95954743 PA |
660 | ptid = ptid_build (lwpid, lwpid, 0); |
661 | else | |
662 | { | |
663 | /* Note that extracting the pid from the current inferior is | |
664 | safe, since we're always called in the context of the same | |
665 | process as this new thread. */ | |
666 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
667 | ptid = ptid_build (pid, lwpid, 0); | |
668 | } | |
24a09b5f | 669 | |
95954743 PA |
670 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
671 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 672 | |
a6dbe5df PA |
673 | /* We need to wait for SIGSTOP before being able to make the next |
674 | ptrace call on this LWP. */ | |
675 | new_lwp->must_set_ptrace_flags = 1; | |
676 | ||
c14d7ab2 PA |
677 | if (pid_is_stopped (lwpid)) |
678 | { | |
679 | if (debug_threads) | |
680 | fprintf (stderr, | |
681 | "Attached to a stopped process\n"); | |
682 | ||
683 | /* The process is definitely stopped. It is in a job control | |
684 | stop, unless the kernel predates the TASK_STOPPED / | |
685 | TASK_TRACED distinction, in which case it might be in a | |
686 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
687 | can kill it, signal it, et cetera. | |
688 | ||
689 | First make sure there is a pending SIGSTOP. Since we are | |
690 | already attached, the process can not transition from stopped | |
691 | to running without a PTRACE_CONT; so we know this signal will | |
692 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
693 | probably already in the queue (unless this kernel is old | |
694 | enough to use TASK_STOPPED for ptrace stops); but since | |
695 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
696 | kill_lwp (lwpid, SIGSTOP); | |
697 | ||
698 | /* Finally, resume the stopped process. This will deliver the | |
699 | SIGSTOP (or a higher priority signal, just like normal | |
700 | PTRACE_ATTACH), which we'll catch later on. */ | |
701 | ptrace (PTRACE_CONT, lwpid, 0, 0); | |
702 | } | |
703 | ||
0d62e5e8 | 704 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
705 | brings it to a halt. |
706 | ||
707 | There are several cases to consider here: | |
708 | ||
709 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 710 | of a new thread that is being created. |
d50171e4 PA |
711 | In this case we should ignore that SIGSTOP and resume the |
712 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 713 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 714 | resume_continue. |
0e21c1ec DE |
715 | |
716 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
717 | to it via attach_inferior. |
718 | In this case we want the process thread to stop. | |
d50171e4 PA |
719 | This is handled by having linux_attach set last_resume_kind == |
720 | resume_stop after we return. | |
e3deef73 LM |
721 | |
722 | If the pid we are attaching to is also the tgid, we attach to and | |
723 | stop all the existing threads. Otherwise, we attach to pid and | |
724 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
725 | |
726 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
727 | existing threads. |
728 | In this case we want the thread to stop. | |
729 | FIXME: This case is currently not properly handled. | |
730 | We should wait for the SIGSTOP but don't. Things work apparently | |
731 | because enough time passes between when we ptrace (ATTACH) and when | |
732 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
733 | |
734 | On the other hand, if we are currently trying to stop all threads, we | |
735 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 736 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
737 | end of the list, and so the new thread has not yet reached |
738 | wait_for_sigstop (but will). */ | |
d50171e4 | 739 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
740 | } |
741 | ||
95954743 PA |
742 | void |
743 | linux_attach_lwp (unsigned long lwpid) | |
744 | { | |
745 | linux_attach_lwp_1 (lwpid, 0); | |
746 | } | |
747 | ||
e3deef73 LM |
748 | /* Attach to PID. If PID is the tgid, attach to it and all |
749 | of its threads. */ | |
750 | ||
0d62e5e8 | 751 | int |
a1928bad | 752 | linux_attach (unsigned long pid) |
0d62e5e8 | 753 | { |
e3deef73 LM |
754 | /* Attach to PID. We will check for other threads |
755 | soon. */ | |
95954743 | 756 | linux_attach_lwp_1 (pid, 1); |
95954743 | 757 | linux_add_process (pid, 1); |
0d62e5e8 | 758 | |
bd99dc85 PA |
759 | if (!non_stop) |
760 | { | |
8336d594 PA |
761 | struct thread_info *thread; |
762 | ||
763 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
764 | process. It will be collected by wait shortly. */ | |
765 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
766 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 767 | } |
0d62e5e8 | 768 | |
e3deef73 LM |
769 | if (linux_proc_get_tgid (pid) == pid) |
770 | { | |
771 | DIR *dir; | |
772 | char pathname[128]; | |
773 | ||
774 | sprintf (pathname, "/proc/%ld/task", pid); | |
775 | ||
776 | dir = opendir (pathname); | |
777 | ||
778 | if (!dir) | |
779 | { | |
780 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
781 | fflush (stderr); | |
782 | } | |
783 | else | |
784 | { | |
785 | /* At this point we attached to the tgid. Scan the task for | |
786 | existing threads. */ | |
787 | unsigned long lwp; | |
788 | int new_threads_found; | |
789 | int iterations = 0; | |
790 | struct dirent *dp; | |
791 | ||
792 | while (iterations < 2) | |
793 | { | |
794 | new_threads_found = 0; | |
795 | /* Add all the other threads. While we go through the | |
796 | threads, new threads may be spawned. Cycle through | |
797 | the list of threads until we have done two iterations without | |
798 | finding new threads. */ | |
799 | while ((dp = readdir (dir)) != NULL) | |
800 | { | |
801 | /* Fetch one lwp. */ | |
802 | lwp = strtoul (dp->d_name, NULL, 10); | |
803 | ||
804 | /* Is this a new thread? */ | |
805 | if (lwp | |
806 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
807 | { | |
808 | linux_attach_lwp_1 (lwp, 0); | |
809 | new_threads_found++; | |
810 | ||
811 | if (debug_threads) | |
812 | fprintf (stderr, "\ | |
813 | Found and attached to new lwp %ld\n", lwp); | |
814 | } | |
815 | } | |
816 | ||
817 | if (!new_threads_found) | |
818 | iterations++; | |
819 | else | |
820 | iterations = 0; | |
821 | ||
822 | rewinddir (dir); | |
823 | } | |
824 | closedir (dir); | |
825 | } | |
826 | } | |
827 | ||
95954743 PA |
828 | return 0; |
829 | } | |
830 | ||
831 | struct counter | |
832 | { | |
833 | int pid; | |
834 | int count; | |
835 | }; | |
836 | ||
837 | static int | |
838 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
839 | { | |
840 | struct counter *counter = args; | |
841 | ||
842 | if (ptid_get_pid (entry->id) == counter->pid) | |
843 | { | |
844 | if (++counter->count > 1) | |
845 | return 1; | |
846 | } | |
d61ddec4 | 847 | |
da6d8c04 DJ |
848 | return 0; |
849 | } | |
850 | ||
95954743 PA |
851 | static int |
852 | last_thread_of_process_p (struct thread_info *thread) | |
853 | { | |
854 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
855 | int pid = ptid_get_pid (ptid); | |
856 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 857 | |
95954743 PA |
858 | return (find_inferior (&all_threads, |
859 | second_thread_of_pid_p, &counter) == NULL); | |
860 | } | |
861 | ||
da84f473 PA |
862 | /* Kill LWP. */ |
863 | ||
864 | static void | |
865 | linux_kill_one_lwp (struct lwp_info *lwp) | |
866 | { | |
867 | int pid = lwpid_of (lwp); | |
868 | ||
869 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
870 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
871 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
872 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
873 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
874 | per process, not one for each thread. But since we still support | |
875 | linuxthreads, and we also support debugging programs using raw | |
876 | clone without CLONE_THREAD, we send one for each thread. For | |
877 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
878 | about some old kernels where PTRACE_KILL might work better | |
879 | (dubious if there are any such, but that's why it's paranoia), so | |
880 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
881 | everywhere. */ | |
882 | ||
883 | errno = 0; | |
884 | kill (pid, SIGKILL); | |
885 | if (debug_threads) | |
886 | fprintf (stderr, | |
887 | "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
888 | target_pid_to_str (ptid_of (lwp)), | |
889 | errno ? strerror (errno) : "OK"); | |
890 | ||
891 | errno = 0; | |
892 | ptrace (PTRACE_KILL, pid, 0, 0); | |
893 | if (debug_threads) | |
894 | fprintf (stderr, | |
895 | "LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
896 | target_pid_to_str (ptid_of (lwp)), | |
897 | errno ? strerror (errno) : "OK"); | |
898 | } | |
899 | ||
900 | /* Callback for `find_inferior'. Kills an lwp of a given process, | |
901 | except the leader. */ | |
95954743 PA |
902 | |
903 | static int | |
da84f473 | 904 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 905 | { |
0d62e5e8 | 906 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 907 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 908 | int wstat; |
95954743 PA |
909 | int pid = * (int *) args; |
910 | ||
911 | if (ptid_get_pid (entry->id) != pid) | |
912 | return 0; | |
0d62e5e8 | 913 | |
fd500816 DJ |
914 | /* We avoid killing the first thread here, because of a Linux kernel (at |
915 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
916 | the children get a chance to be reaped, it will remain a zombie | |
917 | forever. */ | |
95954743 | 918 | |
12b42a12 | 919 | if (lwpid_of (lwp) == pid) |
95954743 PA |
920 | { |
921 | if (debug_threads) | |
922 | fprintf (stderr, "lkop: is last of process %s\n", | |
923 | target_pid_to_str (entry->id)); | |
924 | return 0; | |
925 | } | |
fd500816 | 926 | |
0d62e5e8 DJ |
927 | do |
928 | { | |
da84f473 | 929 | linux_kill_one_lwp (lwp); |
0d62e5e8 DJ |
930 | |
931 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 932 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 933 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
934 | |
935 | return 0; | |
da6d8c04 DJ |
936 | } |
937 | ||
95954743 PA |
938 | static int |
939 | linux_kill (int pid) | |
0d62e5e8 | 940 | { |
95954743 | 941 | struct process_info *process; |
54a0b537 | 942 | struct lwp_info *lwp; |
fd500816 | 943 | int wstat; |
95954743 | 944 | int lwpid; |
fd500816 | 945 | |
95954743 PA |
946 | process = find_process_pid (pid); |
947 | if (process == NULL) | |
948 | return -1; | |
9d606399 | 949 | |
f9e39928 PA |
950 | /* If we're killing a running inferior, make sure it is stopped |
951 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 952 | stop_all_lwps (0, NULL); |
f9e39928 | 953 | |
da84f473 | 954 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 955 | |
54a0b537 | 956 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 957 | thread in the list, so do so now. */ |
95954743 | 958 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 959 | |
784867a5 | 960 | if (lwp == NULL) |
fd500816 | 961 | { |
784867a5 JK |
962 | if (debug_threads) |
963 | fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n", | |
964 | lwpid_of (lwp), pid); | |
965 | } | |
966 | else | |
967 | { | |
968 | if (debug_threads) | |
969 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", | |
970 | lwpid_of (lwp), pid); | |
fd500816 | 971 | |
784867a5 JK |
972 | do |
973 | { | |
da84f473 | 974 | linux_kill_one_lwp (lwp); |
784867a5 JK |
975 | |
976 | /* Make sure it died. The loop is most likely unnecessary. */ | |
977 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); | |
978 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
979 | } | |
2d717e4f | 980 | |
8336d594 | 981 | the_target->mourn (process); |
f9e39928 PA |
982 | |
983 | /* Since we presently can only stop all lwps of all processes, we | |
984 | need to unstop lwps of other processes. */ | |
7984d532 | 985 | unstop_all_lwps (0, NULL); |
95954743 | 986 | return 0; |
0d62e5e8 DJ |
987 | } |
988 | ||
95954743 PA |
989 | static int |
990 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
991 | { |
992 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 993 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
994 | int pid = * (int *) args; |
995 | ||
996 | if (ptid_get_pid (entry->id) != pid) | |
997 | return 0; | |
6ad8ae5c | 998 | |
ae13219e DJ |
999 | /* If this process is stopped but is expecting a SIGSTOP, then make |
1000 | sure we take care of that now. This isn't absolutely guaranteed | |
1001 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 1002 | if (lwp->stop_expected) |
ae13219e | 1003 | { |
bd99dc85 | 1004 | int wstat; |
ae13219e | 1005 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 | 1006 | lwp->stop_expected = 0; |
f9e39928 | 1007 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 1008 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
1009 | } |
1010 | ||
1011 | /* Flush any pending changes to the process's registers. */ | |
1012 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 1013 | get_lwp_thread (lwp)); |
ae13219e DJ |
1014 | |
1015 | /* Finally, let it resume. */ | |
82bfbe7e PA |
1016 | if (the_low_target.prepare_to_resume != NULL) |
1017 | the_low_target.prepare_to_resume (lwp); | |
bd99dc85 PA |
1018 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
1019 | ||
1020 | delete_lwp (lwp); | |
95954743 | 1021 | return 0; |
6ad8ae5c DJ |
1022 | } |
1023 | ||
95954743 PA |
1024 | static int |
1025 | linux_detach (int pid) | |
1026 | { | |
1027 | struct process_info *process; | |
1028 | ||
1029 | process = find_process_pid (pid); | |
1030 | if (process == NULL) | |
1031 | return -1; | |
1032 | ||
f9e39928 PA |
1033 | /* Stop all threads before detaching. First, ptrace requires that |
1034 | the thread is stopped to sucessfully detach. Second, thread_db | |
1035 | may need to uninstall thread event breakpoints from memory, which | |
1036 | only works with a stopped process anyway. */ | |
7984d532 | 1037 | stop_all_lwps (0, NULL); |
f9e39928 | 1038 | |
ca5c370d | 1039 | #ifdef USE_THREAD_DB |
8336d594 | 1040 | thread_db_detach (process); |
ca5c370d PA |
1041 | #endif |
1042 | ||
fa593d66 PA |
1043 | /* Stabilize threads (move out of jump pads). */ |
1044 | stabilize_threads (); | |
1045 | ||
95954743 | 1046 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1047 | |
1048 | the_target->mourn (process); | |
f9e39928 PA |
1049 | |
1050 | /* Since we presently can only stop all lwps of all processes, we | |
1051 | need to unstop lwps of other processes. */ | |
7984d532 | 1052 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1053 | return 0; |
1054 | } | |
1055 | ||
1056 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1057 | ||
1058 | static int | |
1059 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1060 | { | |
1061 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1062 | struct process_info *process = proc; | |
1063 | ||
1064 | if (pid_of (lwp) == pid_of (process)) | |
1065 | delete_lwp (lwp); | |
1066 | ||
dd6953e1 | 1067 | return 0; |
6ad8ae5c DJ |
1068 | } |
1069 | ||
8336d594 PA |
1070 | static void |
1071 | linux_mourn (struct process_info *process) | |
1072 | { | |
1073 | struct process_info_private *priv; | |
1074 | ||
1075 | #ifdef USE_THREAD_DB | |
1076 | thread_db_mourn (process); | |
1077 | #endif | |
1078 | ||
f9e39928 PA |
1079 | find_inferior (&all_lwps, delete_lwp_callback, process); |
1080 | ||
8336d594 PA |
1081 | /* Freeing all private data. */ |
1082 | priv = process->private; | |
1083 | free (priv->arch_private); | |
1084 | free (priv); | |
1085 | process->private = NULL; | |
505106cd PA |
1086 | |
1087 | remove_process (process); | |
8336d594 PA |
1088 | } |
1089 | ||
444d6139 | 1090 | static void |
95954743 | 1091 | linux_join (int pid) |
444d6139 | 1092 | { |
444d6139 PA |
1093 | int status, ret; |
1094 | ||
1095 | do { | |
95954743 | 1096 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1097 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1098 | break; | |
1099 | } while (ret != -1 || errno != ECHILD); | |
1100 | } | |
1101 | ||
6ad8ae5c | 1102 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1103 | static int |
95954743 | 1104 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1105 | { |
95954743 PA |
1106 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1107 | ||
1108 | /* We assume we always know if a thread exits. If a whole process | |
1109 | exited but we still haven't been able to report it to GDB, we'll | |
1110 | hold on to the last lwp of the dead process. */ | |
1111 | if (lwp != NULL) | |
1112 | return !lwp->dead; | |
0d62e5e8 DJ |
1113 | else |
1114 | return 0; | |
1115 | } | |
1116 | ||
6bf5e0ba | 1117 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1118 | static int |
d50171e4 | 1119 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1120 | { |
54a0b537 | 1121 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1122 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1123 | struct thread_info *thread; |
95954743 PA |
1124 | |
1125 | /* Check if we're only interested in events from a specific process | |
1126 | or its lwps. */ | |
1127 | if (!ptid_equal (minus_one_ptid, ptid) | |
1128 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
1129 | return 0; | |
0d62e5e8 | 1130 | |
d50171e4 PA |
1131 | thread = get_lwp_thread (lwp); |
1132 | ||
1133 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1134 | report any status pending the LWP may have. */ | |
8336d594 | 1135 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1136 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1137 | return 0; |
0d62e5e8 | 1138 | |
d50171e4 | 1139 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1140 | } |
1141 | ||
95954743 PA |
1142 | static int |
1143 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1144 | { | |
1145 | ptid_t ptid = *(ptid_t *) data; | |
1146 | int lwp; | |
1147 | ||
1148 | if (ptid_get_lwp (ptid) != 0) | |
1149 | lwp = ptid_get_lwp (ptid); | |
1150 | else | |
1151 | lwp = ptid_get_pid (ptid); | |
1152 | ||
1153 | if (ptid_get_lwp (entry->id) == lwp) | |
1154 | return 1; | |
1155 | ||
1156 | return 0; | |
1157 | } | |
1158 | ||
1159 | struct lwp_info * | |
1160 | find_lwp_pid (ptid_t ptid) | |
1161 | { | |
1162 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1163 | } | |
1164 | ||
bd99dc85 | 1165 | static struct lwp_info * |
95954743 | 1166 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1167 | { |
0d62e5e8 | 1168 | int ret; |
95954743 | 1169 | int to_wait_for = -1; |
bd99dc85 | 1170 | struct lwp_info *child = NULL; |
0d62e5e8 | 1171 | |
bd99dc85 | 1172 | if (debug_threads) |
95954743 PA |
1173 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1174 | ||
1175 | if (ptid_equal (ptid, minus_one_ptid)) | |
1176 | to_wait_for = -1; /* any child */ | |
1177 | else | |
1178 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1179 | |
bd99dc85 | 1180 | options |= __WALL; |
0d62e5e8 | 1181 | |
bd99dc85 | 1182 | retry: |
0d62e5e8 | 1183 | |
bd99dc85 PA |
1184 | ret = my_waitpid (to_wait_for, wstatp, options); |
1185 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1186 | return NULL; | |
1187 | else if (ret == -1) | |
1188 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1189 | |
1190 | if (debug_threads | |
1191 | && (!WIFSTOPPED (*wstatp) | |
1192 | || (WSTOPSIG (*wstatp) != 32 | |
1193 | && WSTOPSIG (*wstatp) != 33))) | |
1194 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1195 | ||
95954743 | 1196 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1197 | |
24a09b5f DJ |
1198 | /* If we didn't find a process, one of two things presumably happened: |
1199 | - A process we started and then detached from has exited. Ignore it. | |
1200 | - A process we are controlling has forked and the new child's stop | |
1201 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1202 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1203 | { |
1204 | add_pid_to_list (&stopped_pids, ret); | |
1205 | goto retry; | |
1206 | } | |
bd99dc85 | 1207 | else if (child == NULL) |
24a09b5f DJ |
1208 | goto retry; |
1209 | ||
bd99dc85 | 1210 | child->stopped = 1; |
0d62e5e8 | 1211 | |
bd99dc85 | 1212 | child->last_status = *wstatp; |
32ca6d61 | 1213 | |
d61ddec4 UW |
1214 | /* Architecture-specific setup after inferior is running. |
1215 | This needs to happen after we have attached to the inferior | |
1216 | and it is stopped for the first time, but before we access | |
1217 | any inferior registers. */ | |
1218 | if (new_inferior) | |
1219 | { | |
1220 | the_low_target.arch_setup (); | |
52fa2412 UW |
1221 | #ifdef HAVE_LINUX_REGSETS |
1222 | memset (disabled_regsets, 0, num_regsets); | |
1223 | #endif | |
d61ddec4 UW |
1224 | new_inferior = 0; |
1225 | } | |
1226 | ||
c3adc08c PA |
1227 | /* Fetch the possibly triggered data watchpoint info and store it in |
1228 | CHILD. | |
1229 | ||
1230 | On some archs, like x86, that use debug registers to set | |
1231 | watchpoints, it's possible that the way to know which watched | |
1232 | address trapped, is to check the register that is used to select | |
1233 | which address to watch. Problem is, between setting the | |
1234 | watchpoint and reading back which data address trapped, the user | |
1235 | may change the set of watchpoints, and, as a consequence, GDB | |
1236 | changes the debug registers in the inferior. To avoid reading | |
1237 | back a stale stopped-data-address when that happens, we cache in | |
1238 | LP the fact that a watchpoint trapped, and the corresponding data | |
1239 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1240 | changes the debug registers meanwhile, we have the cached data we | |
1241 | can rely on. */ | |
1242 | ||
1243 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1244 | { | |
1245 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1246 | { | |
1247 | child->stopped_by_watchpoint = 0; | |
1248 | } | |
1249 | else | |
1250 | { | |
1251 | struct thread_info *saved_inferior; | |
1252 | ||
1253 | saved_inferior = current_inferior; | |
1254 | current_inferior = get_lwp_thread (child); | |
1255 | ||
1256 | child->stopped_by_watchpoint | |
1257 | = the_low_target.stopped_by_watchpoint (); | |
1258 | ||
1259 | if (child->stopped_by_watchpoint) | |
1260 | { | |
1261 | if (the_low_target.stopped_data_address != NULL) | |
1262 | child->stopped_data_address | |
1263 | = the_low_target.stopped_data_address (); | |
1264 | else | |
1265 | child->stopped_data_address = 0; | |
1266 | } | |
1267 | ||
1268 | current_inferior = saved_inferior; | |
1269 | } | |
1270 | } | |
1271 | ||
d50171e4 PA |
1272 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1273 | architecture being defined already (so that CHILD has a valid | |
1274 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1275 | not). */ | |
1276 | if (WIFSTOPPED (*wstatp)) | |
1277 | child->stop_pc = get_stop_pc (child); | |
1278 | ||
0d62e5e8 | 1279 | if (debug_threads |
47c0c975 DE |
1280 | && WIFSTOPPED (*wstatp) |
1281 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1282 | { |
896c7fbb | 1283 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1284 | struct regcache *regcache; |
47c0c975 DE |
1285 | CORE_ADDR pc; |
1286 | ||
d50171e4 | 1287 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1288 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1289 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1290 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1291 | current_inferior = saved_inferior; |
0d62e5e8 | 1292 | } |
bd99dc85 PA |
1293 | |
1294 | return child; | |
0d62e5e8 | 1295 | } |
611cb4a5 | 1296 | |
219f2f23 PA |
1297 | /* This function should only be called if the LWP got a SIGTRAP. |
1298 | ||
1299 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1300 | event was handled, 0 otherwise. */ | |
1301 | ||
1302 | static int | |
1303 | handle_tracepoints (struct lwp_info *lwp) | |
1304 | { | |
1305 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1306 | int tpoint_related_event = 0; | |
1307 | ||
7984d532 PA |
1308 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1309 | uninsert tracepoints. To do this, we temporarily pause all | |
1310 | threads, unpatch away, and then unpause threads. We need to make | |
1311 | sure the unpausing doesn't resume LWP too. */ | |
1312 | lwp->suspended++; | |
1313 | ||
219f2f23 PA |
1314 | /* And we need to be sure that any all-threads-stopping doesn't try |
1315 | to move threads out of the jump pads, as it could deadlock the | |
1316 | inferior (LWP could be in the jump pad, maybe even holding the | |
1317 | lock.) */ | |
1318 | ||
1319 | /* Do any necessary step collect actions. */ | |
1320 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1321 | ||
fa593d66 PA |
1322 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1323 | ||
219f2f23 PA |
1324 | /* See if we just hit a tracepoint and do its main collect |
1325 | actions. */ | |
1326 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1327 | ||
7984d532 PA |
1328 | lwp->suspended--; |
1329 | ||
1330 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1331 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1332 | |
219f2f23 PA |
1333 | if (tpoint_related_event) |
1334 | { | |
1335 | if (debug_threads) | |
1336 | fprintf (stderr, "got a tracepoint event\n"); | |
1337 | return 1; | |
1338 | } | |
1339 | ||
1340 | return 0; | |
1341 | } | |
1342 | ||
fa593d66 PA |
1343 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1344 | fast tracepoint. */ | |
1345 | ||
1346 | static int | |
1347 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1348 | struct fast_tpoint_collect_status *status) | |
1349 | { | |
1350 | CORE_ADDR thread_area; | |
1351 | ||
1352 | if (the_low_target.get_thread_area == NULL) | |
1353 | return 0; | |
1354 | ||
1355 | /* Get the thread area address. This is used to recognize which | |
1356 | thread is which when tracing with the in-process agent library. | |
1357 | We don't read anything from the address, and treat it as opaque; | |
1358 | it's the address itself that we assume is unique per-thread. */ | |
1359 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1360 | return 0; | |
1361 | ||
1362 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1363 | } | |
1364 | ||
1365 | /* The reason we resume in the caller, is because we want to be able | |
1366 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1367 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1368 | refuses to resume. */ | |
1369 | ||
1370 | static int | |
1371 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1372 | { | |
1373 | struct thread_info *saved_inferior; | |
1374 | ||
1375 | saved_inferior = current_inferior; | |
1376 | current_inferior = get_lwp_thread (lwp); | |
1377 | ||
1378 | if ((wstat == NULL | |
1379 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1380 | && supports_fast_tracepoints () | |
1381 | && in_process_agent_loaded ()) | |
1382 | { | |
1383 | struct fast_tpoint_collect_status status; | |
1384 | int r; | |
1385 | ||
1386 | if (debug_threads) | |
1387 | fprintf (stderr, "\ | |
1388 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1389 | lwpid_of (lwp)); | |
1390 | ||
1391 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1392 | ||
1393 | if (wstat == NULL | |
1394 | || (WSTOPSIG (*wstat) != SIGILL | |
1395 | && WSTOPSIG (*wstat) != SIGFPE | |
1396 | && WSTOPSIG (*wstat) != SIGSEGV | |
1397 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1398 | { | |
1399 | lwp->collecting_fast_tracepoint = r; | |
1400 | ||
1401 | if (r != 0) | |
1402 | { | |
1403 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1404 | { | |
1405 | /* Haven't executed the original instruction yet. | |
1406 | Set breakpoint there, and wait till it's hit, | |
1407 | then single-step until exiting the jump pad. */ | |
1408 | lwp->exit_jump_pad_bkpt | |
1409 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1410 | } | |
1411 | ||
1412 | if (debug_threads) | |
1413 | fprintf (stderr, "\ | |
1414 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1415 | lwpid_of (lwp)); | |
0cccb683 | 1416 | current_inferior = saved_inferior; |
fa593d66 PA |
1417 | |
1418 | return 1; | |
1419 | } | |
1420 | } | |
1421 | else | |
1422 | { | |
1423 | /* If we get a synchronous signal while collecting, *and* | |
1424 | while executing the (relocated) original instruction, | |
1425 | reset the PC to point at the tpoint address, before | |
1426 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1427 | report the signal to GDB, and pray for the best. */ | |
1428 | ||
1429 | lwp->collecting_fast_tracepoint = 0; | |
1430 | ||
1431 | if (r != 0 | |
1432 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1433 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1434 | { | |
1435 | siginfo_t info; | |
1436 | struct regcache *regcache; | |
1437 | ||
1438 | /* The si_addr on a few signals references the address | |
1439 | of the faulting instruction. Adjust that as | |
1440 | well. */ | |
1441 | if ((WSTOPSIG (*wstat) == SIGILL | |
1442 | || WSTOPSIG (*wstat) == SIGFPE | |
1443 | || WSTOPSIG (*wstat) == SIGBUS | |
1444 | || WSTOPSIG (*wstat) == SIGSEGV) | |
1445 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &info) == 0 | |
1446 | /* Final check just to make sure we don't clobber | |
1447 | the siginfo of non-kernel-sent signals. */ | |
1448 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1449 | { | |
1450 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
1451 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &info); | |
1452 | } | |
1453 | ||
1454 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1455 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1456 | lwp->stop_pc = status.tpoint_addr; | |
1457 | ||
1458 | /* Cancel any fast tracepoint lock this thread was | |
1459 | holding. */ | |
1460 | force_unlock_trace_buffer (); | |
1461 | } | |
1462 | ||
1463 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1464 | { | |
1465 | if (debug_threads) | |
1466 | fprintf (stderr, | |
1467 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1468 | "stopping all threads momentarily.\n"); | |
1469 | ||
1470 | stop_all_lwps (1, lwp); | |
1471 | cancel_breakpoints (); | |
1472 | ||
1473 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1474 | lwp->exit_jump_pad_bkpt = NULL; | |
1475 | ||
1476 | unstop_all_lwps (1, lwp); | |
1477 | ||
1478 | gdb_assert (lwp->suspended >= 0); | |
1479 | } | |
1480 | } | |
1481 | } | |
1482 | ||
1483 | if (debug_threads) | |
1484 | fprintf (stderr, "\ | |
1485 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1486 | lwpid_of (lwp)); | |
0cccb683 YQ |
1487 | |
1488 | current_inferior = saved_inferior; | |
fa593d66 PA |
1489 | return 0; |
1490 | } | |
1491 | ||
1492 | /* Enqueue one signal in the "signals to report later when out of the | |
1493 | jump pad" list. */ | |
1494 | ||
1495 | static void | |
1496 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1497 | { | |
1498 | struct pending_signals *p_sig; | |
1499 | ||
1500 | if (debug_threads) | |
1501 | fprintf (stderr, "\ | |
1502 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1503 | ||
1504 | if (debug_threads) | |
1505 | { | |
1506 | struct pending_signals *sig; | |
1507 | ||
1508 | for (sig = lwp->pending_signals_to_report; | |
1509 | sig != NULL; | |
1510 | sig = sig->prev) | |
1511 | fprintf (stderr, | |
1512 | " Already queued %d\n", | |
1513 | sig->signal); | |
1514 | ||
1515 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1516 | } | |
1517 | ||
1a981360 PA |
1518 | /* Don't enqueue non-RT signals if they are already in the deferred |
1519 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1520 | twice) */ | |
1521 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1522 | { | |
1523 | struct pending_signals *sig; | |
1524 | ||
1525 | for (sig = lwp->pending_signals_to_report; | |
1526 | sig != NULL; | |
1527 | sig = sig->prev) | |
1528 | { | |
1529 | if (sig->signal == WSTOPSIG (*wstat)) | |
1530 | { | |
1531 | if (debug_threads) | |
1532 | fprintf (stderr, | |
1533 | "Not requeuing already queued non-RT signal %d" | |
1534 | " for LWP %ld\n", | |
1535 | sig->signal, | |
1536 | lwpid_of (lwp)); | |
1537 | return; | |
1538 | } | |
1539 | } | |
1540 | } | |
1541 | ||
fa593d66 PA |
1542 | p_sig = xmalloc (sizeof (*p_sig)); |
1543 | p_sig->prev = lwp->pending_signals_to_report; | |
1544 | p_sig->signal = WSTOPSIG (*wstat); | |
1545 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1546 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1547 | ||
1548 | lwp->pending_signals_to_report = p_sig; | |
1549 | } | |
1550 | ||
1551 | /* Dequeue one signal from the "signals to report later when out of | |
1552 | the jump pad" list. */ | |
1553 | ||
1554 | static int | |
1555 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1556 | { | |
1557 | if (lwp->pending_signals_to_report != NULL) | |
1558 | { | |
1559 | struct pending_signals **p_sig; | |
1560 | ||
1561 | p_sig = &lwp->pending_signals_to_report; | |
1562 | while ((*p_sig)->prev != NULL) | |
1563 | p_sig = &(*p_sig)->prev; | |
1564 | ||
1565 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1566 | if ((*p_sig)->info.si_signo != 0) | |
1567 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); | |
1568 | free (*p_sig); | |
1569 | *p_sig = NULL; | |
1570 | ||
1571 | if (debug_threads) | |
1572 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1573 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1574 | ||
1575 | if (debug_threads) | |
1576 | { | |
1577 | struct pending_signals *sig; | |
1578 | ||
1579 | for (sig = lwp->pending_signals_to_report; | |
1580 | sig != NULL; | |
1581 | sig = sig->prev) | |
1582 | fprintf (stderr, | |
1583 | " Still queued %d\n", | |
1584 | sig->signal); | |
1585 | ||
1586 | fprintf (stderr, " (no more queued signals)\n"); | |
1587 | } | |
1588 | ||
1589 | return 1; | |
1590 | } | |
1591 | ||
1592 | return 0; | |
1593 | } | |
1594 | ||
d50171e4 PA |
1595 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1596 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1597 | will handle the current event, eventually we will resume this LWP, | |
1598 | and this breakpoint will trap again. */ | |
1599 | ||
1600 | static int | |
1601 | cancel_breakpoint (struct lwp_info *lwp) | |
1602 | { | |
1603 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1604 | |
1605 | /* There's nothing to do if we don't support breakpoints. */ | |
1606 | if (!supports_breakpoints ()) | |
1607 | return 0; | |
1608 | ||
d50171e4 PA |
1609 | /* breakpoint_at reads from current inferior. */ |
1610 | saved_inferior = current_inferior; | |
1611 | current_inferior = get_lwp_thread (lwp); | |
1612 | ||
1613 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1614 | { | |
1615 | if (debug_threads) | |
1616 | fprintf (stderr, | |
1617 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1618 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1619 | |
1620 | /* Back up the PC if necessary. */ | |
1621 | if (the_low_target.decr_pc_after_break) | |
1622 | { | |
1623 | struct regcache *regcache | |
fc7238bb | 1624 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1625 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1626 | } | |
1627 | ||
1628 | current_inferior = saved_inferior; | |
1629 | return 1; | |
1630 | } | |
1631 | else | |
1632 | { | |
1633 | if (debug_threads) | |
1634 | fprintf (stderr, | |
1635 | "CB: No breakpoint found at %s for [%s]\n", | |
1636 | paddress (lwp->stop_pc), | |
fc7238bb | 1637 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1638 | } |
1639 | ||
1640 | current_inferior = saved_inferior; | |
1641 | return 0; | |
1642 | } | |
1643 | ||
1644 | /* When the event-loop is doing a step-over, this points at the thread | |
1645 | being stepped. */ | |
1646 | ptid_t step_over_bkpt; | |
1647 | ||
bd99dc85 PA |
1648 | /* Wait for an event from child PID. If PID is -1, wait for any |
1649 | child. Store the stop status through the status pointer WSTAT. | |
1650 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1651 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1652 | the stopped child otherwise. */ | |
1653 | ||
0d62e5e8 | 1654 | static int |
d8301ad1 | 1655 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1656 | { |
d50171e4 | 1657 | struct lwp_info *event_child, *requested_child; |
d8301ad1 | 1658 | ptid_t wait_ptid; |
d50171e4 | 1659 | |
d50171e4 PA |
1660 | event_child = NULL; |
1661 | requested_child = NULL; | |
0d62e5e8 | 1662 | |
95954743 | 1663 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1664 | |
e825046f | 1665 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
0d62e5e8 | 1666 | { |
54a0b537 | 1667 | event_child = (struct lwp_info *) |
d50171e4 | 1668 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1669 | if (debug_threads && event_child) |
bd99dc85 | 1670 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1671 | } |
1672 | else | |
1673 | { | |
95954743 | 1674 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1675 | |
fa593d66 PA |
1676 | if (!stopping_threads |
1677 | && requested_child->status_pending_p | |
1678 | && requested_child->collecting_fast_tracepoint) | |
1679 | { | |
1680 | enqueue_one_deferred_signal (requested_child, | |
1681 | &requested_child->status_pending); | |
1682 | requested_child->status_pending_p = 0; | |
1683 | requested_child->status_pending = 0; | |
1684 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1685 | } | |
1686 | ||
1687 | if (requested_child->suspended | |
1688 | && requested_child->status_pending_p) | |
1689 | fatal ("requesting an event out of a suspended child?"); | |
1690 | ||
d50171e4 | 1691 | if (requested_child->status_pending_p) |
bd99dc85 | 1692 | event_child = requested_child; |
0d62e5e8 | 1693 | } |
611cb4a5 | 1694 | |
0d62e5e8 DJ |
1695 | if (event_child != NULL) |
1696 | { | |
bd99dc85 PA |
1697 | if (debug_threads) |
1698 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1699 | lwpid_of (event_child), event_child->status_pending); | |
1700 | *wstat = event_child->status_pending; | |
1701 | event_child->status_pending_p = 0; | |
1702 | event_child->status_pending = 0; | |
1703 | current_inferior = get_lwp_thread (event_child); | |
1704 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1705 | } |
1706 | ||
d8301ad1 JK |
1707 | if (ptid_is_pid (ptid)) |
1708 | { | |
1709 | /* A request to wait for a specific tgid. This is not possible | |
1710 | with waitpid, so instead, we wait for any child, and leave | |
1711 | children we're not interested in right now with a pending | |
1712 | status to report later. */ | |
1713 | wait_ptid = minus_one_ptid; | |
1714 | } | |
1715 | else | |
1716 | wait_ptid = ptid; | |
1717 | ||
0d62e5e8 DJ |
1718 | /* We only enter this loop if no process has a pending wait status. Thus |
1719 | any action taken in response to a wait status inside this loop is | |
1720 | responding as soon as we detect the status, not after any pending | |
1721 | events. */ | |
1722 | while (1) | |
1723 | { | |
d8301ad1 | 1724 | event_child = linux_wait_for_lwp (wait_ptid, wstat, options); |
0d62e5e8 | 1725 | |
bd99dc85 | 1726 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1727 | { |
1728 | if (debug_threads) | |
1729 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1730 | return 0; | |
1731 | } | |
0d62e5e8 DJ |
1732 | |
1733 | if (event_child == NULL) | |
1734 | error ("event from unknown child"); | |
611cb4a5 | 1735 | |
d8301ad1 JK |
1736 | if (ptid_is_pid (ptid) |
1737 | && ptid_get_pid (ptid) != ptid_get_pid (ptid_of (event_child))) | |
1738 | { | |
1739 | if (! WIFSTOPPED (*wstat)) | |
1740 | mark_lwp_dead (event_child, *wstat); | |
1741 | else | |
1742 | { | |
1743 | event_child->status_pending_p = 1; | |
1744 | event_child->status_pending = *wstat; | |
1745 | } | |
1746 | continue; | |
1747 | } | |
1748 | ||
bd99dc85 | 1749 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1750 | |
89be2091 | 1751 | /* Check for thread exit. */ |
bd99dc85 | 1752 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1753 | { |
89be2091 | 1754 | if (debug_threads) |
95954743 | 1755 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1756 | |
1757 | /* If the last thread is exiting, just return. */ | |
95954743 | 1758 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1759 | { |
1760 | if (debug_threads) | |
95954743 PA |
1761 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1762 | lwpid_of (event_child)); | |
bd99dc85 PA |
1763 | return lwpid_of (event_child); |
1764 | } | |
89be2091 | 1765 | |
bd99dc85 PA |
1766 | if (!non_stop) |
1767 | { | |
1768 | current_inferior = (struct thread_info *) all_threads.head; | |
1769 | if (debug_threads) | |
1770 | fprintf (stderr, "Current inferior is now %ld\n", | |
1771 | lwpid_of (get_thread_lwp (current_inferior))); | |
1772 | } | |
1773 | else | |
1774 | { | |
1775 | current_inferior = NULL; | |
1776 | if (debug_threads) | |
1777 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1778 | } | |
89be2091 DJ |
1779 | |
1780 | /* If we were waiting for this particular child to do something... | |
1781 | well, it did something. */ | |
bd99dc85 | 1782 | if (requested_child != NULL) |
d50171e4 PA |
1783 | { |
1784 | int lwpid = lwpid_of (event_child); | |
1785 | ||
1786 | /* Cancel the step-over operation --- the thread that | |
1787 | started it is gone. */ | |
1788 | if (finish_step_over (event_child)) | |
7984d532 | 1789 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1790 | delete_lwp (event_child); |
1791 | return lwpid; | |
1792 | } | |
1793 | ||
1794 | delete_lwp (event_child); | |
89be2091 DJ |
1795 | |
1796 | /* Wait for a more interesting event. */ | |
1797 | continue; | |
1798 | } | |
1799 | ||
a6dbe5df PA |
1800 | if (event_child->must_set_ptrace_flags) |
1801 | { | |
1e7fc18c | 1802 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1803 | event_child->must_set_ptrace_flags = 0; |
1804 | } | |
1805 | ||
bd99dc85 PA |
1806 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1807 | && *wstat >> 16 != 0) | |
24a09b5f | 1808 | { |
bd99dc85 | 1809 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1810 | continue; |
1811 | } | |
1812 | ||
d50171e4 PA |
1813 | if (WIFSTOPPED (*wstat) |
1814 | && WSTOPSIG (*wstat) == SIGSTOP | |
1815 | && event_child->stop_expected) | |
1816 | { | |
1817 | int should_stop; | |
1818 | ||
1819 | if (debug_threads) | |
1820 | fprintf (stderr, "Expected stop.\n"); | |
1821 | event_child->stop_expected = 0; | |
1822 | ||
8336d594 | 1823 | should_stop = (current_inferior->last_resume_kind == resume_stop |
d50171e4 PA |
1824 | || stopping_threads); |
1825 | ||
1826 | if (!should_stop) | |
1827 | { | |
1828 | linux_resume_one_lwp (event_child, | |
1829 | event_child->stepping, 0, NULL); | |
1830 | continue; | |
1831 | } | |
1832 | } | |
1833 | ||
bd99dc85 | 1834 | return lwpid_of (event_child); |
611cb4a5 | 1835 | } |
0d62e5e8 | 1836 | |
611cb4a5 DJ |
1837 | /* NOTREACHED */ |
1838 | return 0; | |
1839 | } | |
1840 | ||
6bf5e0ba PA |
1841 | /* Count the LWP's that have had events. */ |
1842 | ||
1843 | static int | |
1844 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1845 | { | |
1846 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1847 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1848 | int *count = data; |
1849 | ||
1850 | gdb_assert (count != NULL); | |
1851 | ||
1852 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1853 | should be reported to GDB. */ | |
8336d594 PA |
1854 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1855 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
1856 | && lp->status_pending_p |
1857 | && WIFSTOPPED (lp->status_pending) | |
1858 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1859 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1860 | (*count)++; | |
1861 | ||
1862 | return 0; | |
1863 | } | |
1864 | ||
1865 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1866 | ||
1867 | static int | |
1868 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1869 | { | |
1870 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1871 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 1872 | |
8336d594 PA |
1873 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1874 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
1875 | && lp->status_pending_p) |
1876 | return 1; | |
1877 | else | |
1878 | return 0; | |
1879 | } | |
1880 | ||
1881 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1882 | reported to GDB. */ | |
1883 | ||
1884 | static int | |
1885 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1886 | { | |
1887 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1888 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1889 | int *selector = data; |
1890 | ||
1891 | gdb_assert (selector != NULL); | |
1892 | ||
1893 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
1894 | if (thread->last_resume_kind != resume_stop |
1895 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1896 | && lp->status_pending_p |
1897 | && WIFSTOPPED (lp->status_pending) | |
1898 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1899 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1900 | if ((*selector)-- == 0) | |
1901 | return 1; | |
1902 | ||
1903 | return 0; | |
1904 | } | |
1905 | ||
1906 | static int | |
1907 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
1908 | { | |
1909 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1910 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1911 | struct lwp_info *event_lp = data; |
1912 | ||
1913 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1914 | if (lp == event_lp) | |
1915 | return 0; | |
1916 | ||
1917 | /* If a LWP other than the LWP that we're reporting an event for has | |
1918 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1919 | then just arrange for it to hit it again later. We don't keep | |
1920 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1921 | LWP. We will handle the current event, eventually we will resume | |
1922 | all LWPs, and this one will get its breakpoint trap again. | |
1923 | ||
1924 | If we do not do this, then we run the risk that the user will | |
1925 | delete or disable the breakpoint, but the LWP will have already | |
1926 | tripped on it. */ | |
1927 | ||
8336d594 PA |
1928 | if (thread->last_resume_kind != resume_stop |
1929 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1930 | && lp->status_pending_p |
1931 | && WIFSTOPPED (lp->status_pending) | |
1932 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
1933 | && !lp->stepping |
1934 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
1935 | && cancel_breakpoint (lp)) |
1936 | /* Throw away the SIGTRAP. */ | |
1937 | lp->status_pending_p = 0; | |
1938 | ||
1939 | return 0; | |
1940 | } | |
1941 | ||
7984d532 PA |
1942 | static void |
1943 | linux_cancel_breakpoints (void) | |
1944 | { | |
1945 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
1946 | } | |
1947 | ||
6bf5e0ba PA |
1948 | /* Select one LWP out of those that have events pending. */ |
1949 | ||
1950 | static void | |
1951 | select_event_lwp (struct lwp_info **orig_lp) | |
1952 | { | |
1953 | int num_events = 0; | |
1954 | int random_selector; | |
1955 | struct lwp_info *event_lp; | |
1956 | ||
1957 | /* Give preference to any LWP that is being single-stepped. */ | |
1958 | event_lp | |
1959 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1960 | select_singlestep_lwp_callback, NULL); | |
1961 | if (event_lp != NULL) | |
1962 | { | |
1963 | if (debug_threads) | |
1964 | fprintf (stderr, | |
1965 | "SEL: Select single-step %s\n", | |
1966 | target_pid_to_str (ptid_of (event_lp))); | |
1967 | } | |
1968 | else | |
1969 | { | |
1970 | /* No single-stepping LWP. Select one at random, out of those | |
1971 | which have had SIGTRAP events. */ | |
1972 | ||
1973 | /* First see how many SIGTRAP events we have. */ | |
1974 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
1975 | ||
1976 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1977 | random_selector = (int) | |
1978 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1979 | ||
1980 | if (debug_threads && num_events > 1) | |
1981 | fprintf (stderr, | |
1982 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1983 | num_events, random_selector); | |
1984 | ||
1985 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
1986 | select_event_lwp_callback, | |
1987 | &random_selector); | |
1988 | } | |
1989 | ||
1990 | if (event_lp != NULL) | |
1991 | { | |
1992 | /* Switch the event LWP. */ | |
1993 | *orig_lp = event_lp; | |
1994 | } | |
1995 | } | |
1996 | ||
7984d532 PA |
1997 | /* Decrement the suspend count of an LWP. */ |
1998 | ||
1999 | static int | |
2000 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2001 | { | |
2002 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2003 | ||
2004 | /* Ignore EXCEPT. */ | |
2005 | if (lwp == except) | |
2006 | return 0; | |
2007 | ||
2008 | lwp->suspended--; | |
2009 | ||
2010 | gdb_assert (lwp->suspended >= 0); | |
2011 | return 0; | |
2012 | } | |
2013 | ||
2014 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2015 | NULL. */ | |
2016 | ||
2017 | static void | |
2018 | unsuspend_all_lwps (struct lwp_info *except) | |
2019 | { | |
2020 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
2021 | } | |
2022 | ||
fa593d66 PA |
2023 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2024 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2025 | void *data); | |
2026 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2027 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2028 | struct target_waitstatus *ourstatus, | |
2029 | int target_options); | |
2030 | ||
2031 | /* Stabilize threads (move out of jump pads). | |
2032 | ||
2033 | If a thread is midway collecting a fast tracepoint, we need to | |
2034 | finish the collection and move it out of the jump pad before | |
2035 | reporting the signal. | |
2036 | ||
2037 | This avoids recursion while collecting (when a signal arrives | |
2038 | midway, and the signal handler itself collects), which would trash | |
2039 | the trace buffer. In case the user set a breakpoint in a signal | |
2040 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2041 | Most importantly, there are certain things we can't do safely if | |
2042 | threads are stopped in a jump pad (or in its callee's). For | |
2043 | example: | |
2044 | ||
2045 | - starting a new trace run. A thread still collecting the | |
2046 | previous run, could trash the trace buffer when resumed. The trace | |
2047 | buffer control structures would have been reset but the thread had | |
2048 | no way to tell. The thread could even midway memcpy'ing to the | |
2049 | buffer, which would mean that when resumed, it would clobber the | |
2050 | trace buffer that had been set for a new run. | |
2051 | ||
2052 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2053 | safely. Say you do tstart while a thread is stopped midway while | |
2054 | collecting. When the thread is later resumed, it finishes the | |
2055 | collection, and returns to the jump pad, to execute the original | |
2056 | instruction that was under the tracepoint jump at the time the | |
2057 | older run had been started. If the jump pad had been rewritten | |
2058 | since for something else in the new run, the thread would now | |
2059 | execute the wrong / random instructions. */ | |
2060 | ||
2061 | static void | |
2062 | linux_stabilize_threads (void) | |
2063 | { | |
2064 | struct thread_info *save_inferior; | |
2065 | struct lwp_info *lwp_stuck; | |
2066 | ||
2067 | lwp_stuck | |
2068 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2069 | stuck_in_jump_pad_callback, NULL); | |
2070 | if (lwp_stuck != NULL) | |
2071 | { | |
b4d51a55 PA |
2072 | if (debug_threads) |
2073 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
2074 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2075 | return; |
2076 | } | |
2077 | ||
2078 | save_inferior = current_inferior; | |
2079 | ||
2080 | stabilizing_threads = 1; | |
2081 | ||
2082 | /* Kick 'em all. */ | |
2083 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2084 | ||
2085 | /* Loop until all are stopped out of the jump pads. */ | |
2086 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2087 | { | |
2088 | struct target_waitstatus ourstatus; | |
2089 | struct lwp_info *lwp; | |
fa593d66 PA |
2090 | int wstat; |
2091 | ||
2092 | /* Note that we go through the full wait even loop. While | |
2093 | moving threads out of jump pad, we need to be able to step | |
2094 | over internal breakpoints and such. */ | |
32fcada3 | 2095 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2096 | |
2097 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2098 | { | |
2099 | lwp = get_thread_lwp (current_inferior); | |
2100 | ||
2101 | /* Lock it. */ | |
2102 | lwp->suspended++; | |
2103 | ||
2104 | if (ourstatus.value.sig != TARGET_SIGNAL_0 | |
2105 | || current_inferior->last_resume_kind == resume_stop) | |
2106 | { | |
2107 | wstat = W_STOPCODE (target_signal_to_host (ourstatus.value.sig)); | |
2108 | enqueue_one_deferred_signal (lwp, &wstat); | |
2109 | } | |
2110 | } | |
2111 | } | |
2112 | ||
2113 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2114 | ||
2115 | stabilizing_threads = 0; | |
2116 | ||
2117 | current_inferior = save_inferior; | |
2118 | ||
b4d51a55 | 2119 | if (debug_threads) |
fa593d66 | 2120 | { |
b4d51a55 PA |
2121 | lwp_stuck |
2122 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2123 | stuck_in_jump_pad_callback, NULL); | |
2124 | if (lwp_stuck != NULL) | |
fa593d66 PA |
2125 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2126 | lwpid_of (lwp_stuck)); | |
2127 | } | |
2128 | } | |
2129 | ||
0d62e5e8 | 2130 | /* Wait for process, returns status. */ |
da6d8c04 | 2131 | |
95954743 PA |
2132 | static ptid_t |
2133 | linux_wait_1 (ptid_t ptid, | |
2134 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2135 | { |
e5f1222d | 2136 | int w; |
fc7238bb | 2137 | struct lwp_info *event_child; |
bd99dc85 | 2138 | int options; |
bd99dc85 | 2139 | int pid; |
6bf5e0ba PA |
2140 | int step_over_finished; |
2141 | int bp_explains_trap; | |
2142 | int maybe_internal_trap; | |
2143 | int report_to_gdb; | |
219f2f23 | 2144 | int trace_event; |
bd99dc85 PA |
2145 | |
2146 | /* Translate generic target options into linux options. */ | |
2147 | options = __WALL; | |
2148 | if (target_options & TARGET_WNOHANG) | |
2149 | options |= WNOHANG; | |
0d62e5e8 DJ |
2150 | |
2151 | retry: | |
fa593d66 PA |
2152 | bp_explains_trap = 0; |
2153 | trace_event = 0; | |
bd99dc85 PA |
2154 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2155 | ||
0d62e5e8 DJ |
2156 | /* If we were only supposed to resume one thread, only wait for |
2157 | that thread - if it's still alive. If it died, however - which | |
2158 | can happen if we're coming from the thread death case below - | |
2159 | then we need to make sure we restart the other threads. We could | |
2160 | pick a thread at random or restart all; restarting all is less | |
2161 | arbitrary. */ | |
95954743 PA |
2162 | if (!non_stop |
2163 | && !ptid_equal (cont_thread, null_ptid) | |
2164 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2165 | { |
fc7238bb PA |
2166 | struct thread_info *thread; |
2167 | ||
bd99dc85 PA |
2168 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2169 | cont_thread); | |
0d62e5e8 DJ |
2170 | |
2171 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2172 | if (thread == NULL) |
64386c31 DJ |
2173 | { |
2174 | struct thread_resume resume_info; | |
95954743 | 2175 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2176 | resume_info.kind = resume_continue; |
2177 | resume_info.sig = 0; | |
2bd7c093 | 2178 | linux_resume (&resume_info, 1); |
64386c31 | 2179 | } |
bd99dc85 | 2180 | else |
95954743 | 2181 | ptid = cont_thread; |
0d62e5e8 | 2182 | } |
da6d8c04 | 2183 | |
6bf5e0ba PA |
2184 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2185 | pid = linux_wait_for_event (ptid, &w, options); | |
2186 | else | |
2187 | { | |
2188 | if (debug_threads) | |
2189 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2190 | target_pid_to_str (step_over_bkpt)); | |
2191 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2192 | } | |
2193 | ||
bd99dc85 | 2194 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2195 | return null_ptid; |
bd99dc85 | 2196 | |
6bf5e0ba | 2197 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2198 | |
0d62e5e8 DJ |
2199 | /* If we are waiting for a particular child, and it exited, |
2200 | linux_wait_for_event will return its exit status. Similarly if | |
2201 | the last child exited. If this is not the last child, however, | |
2202 | do not report it as exited until there is a 'thread exited' response | |
2203 | available in the remote protocol. Instead, just wait for another event. | |
2204 | This should be safe, because if the thread crashed we will already | |
2205 | have reported the termination signal to GDB; that should stop any | |
2206 | in-progress stepping operations, etc. | |
2207 | ||
2208 | Report the exit status of the last thread to exit. This matches | |
2209 | LinuxThreads' behavior. */ | |
2210 | ||
95954743 | 2211 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2212 | { |
bd99dc85 | 2213 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2214 | { |
bd99dc85 PA |
2215 | if (WIFEXITED (w)) |
2216 | { | |
2217 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2218 | ourstatus->value.integer = WEXITSTATUS (w); | |
2219 | ||
2220 | if (debug_threads) | |
493e2a69 MS |
2221 | fprintf (stderr, |
2222 | "\nChild exited with retcode = %x \n", | |
2223 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2224 | } |
2225 | else | |
2226 | { | |
2227 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2228 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
2229 | ||
2230 | if (debug_threads) | |
493e2a69 MS |
2231 | fprintf (stderr, |
2232 | "\nChild terminated with signal = %x \n", | |
2233 | WTERMSIG (w)); | |
bd99dc85 PA |
2234 | |
2235 | } | |
5b1c542e | 2236 | |
3e4c1235 | 2237 | return ptid_of (event_child); |
0d62e5e8 | 2238 | } |
da6d8c04 | 2239 | } |
0d62e5e8 | 2240 | else |
da6d8c04 | 2241 | { |
0d62e5e8 DJ |
2242 | if (!WIFSTOPPED (w)) |
2243 | goto retry; | |
da6d8c04 DJ |
2244 | } |
2245 | ||
6bf5e0ba PA |
2246 | /* If this event was not handled before, and is not a SIGTRAP, we |
2247 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2248 | a breakpoint is inserted at the current PC. If this target does | |
2249 | not support internal breakpoints at all, we also report the | |
2250 | SIGTRAP without further processing; it's of no concern to us. */ | |
2251 | maybe_internal_trap | |
2252 | = (supports_breakpoints () | |
2253 | && (WSTOPSIG (w) == SIGTRAP | |
2254 | || ((WSTOPSIG (w) == SIGILL | |
2255 | || WSTOPSIG (w) == SIGSEGV) | |
2256 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2257 | ||
2258 | if (maybe_internal_trap) | |
2259 | { | |
2260 | /* Handle anything that requires bookkeeping before deciding to | |
2261 | report the event or continue waiting. */ | |
2262 | ||
2263 | /* First check if we can explain the SIGTRAP with an internal | |
2264 | breakpoint, or if we should possibly report the event to GDB. | |
2265 | Do this before anything that may remove or insert a | |
2266 | breakpoint. */ | |
2267 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2268 | ||
2269 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2270 | finished. If so, tweak the state machine accordingly, | |
2271 | reinsert breakpoints and delete any reinsert (software | |
2272 | single-step) breakpoints. */ | |
2273 | step_over_finished = finish_step_over (event_child); | |
2274 | ||
2275 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2276 | check_breakpoints (event_child->stop_pc); | |
2277 | ||
219f2f23 PA |
2278 | /* Handle tracepoint data collecting. This may overflow the |
2279 | trace buffer, and cause a tracing stop, removing | |
2280 | breakpoints. */ | |
2281 | trace_event = handle_tracepoints (event_child); | |
2282 | ||
6bf5e0ba PA |
2283 | if (bp_explains_trap) |
2284 | { | |
2285 | /* If we stepped or ran into an internal breakpoint, we've | |
2286 | already handled it. So next time we resume (from this | |
2287 | PC), we should step over it. */ | |
2288 | if (debug_threads) | |
2289 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2290 | ||
8b07ae33 PA |
2291 | if (breakpoint_here (event_child->stop_pc)) |
2292 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2293 | } |
2294 | } | |
2295 | else | |
2296 | { | |
2297 | /* We have some other signal, possibly a step-over dance was in | |
2298 | progress, and it should be cancelled too. */ | |
2299 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2300 | } |
2301 | ||
2302 | /* We have all the data we need. Either report the event to GDB, or | |
2303 | resume threads and keep waiting for more. */ | |
2304 | ||
2305 | /* If we're collecting a fast tracepoint, finish the collection and | |
2306 | move out of the jump pad before delivering a signal. See | |
2307 | linux_stabilize_threads. */ | |
2308 | ||
2309 | if (WIFSTOPPED (w) | |
2310 | && WSTOPSIG (w) != SIGTRAP | |
2311 | && supports_fast_tracepoints () | |
2312 | && in_process_agent_loaded ()) | |
2313 | { | |
2314 | if (debug_threads) | |
2315 | fprintf (stderr, | |
2316 | "Got signal %d for LWP %ld. Check if we need " | |
2317 | "to defer or adjust it.\n", | |
2318 | WSTOPSIG (w), lwpid_of (event_child)); | |
2319 | ||
2320 | /* Allow debugging the jump pad itself. */ | |
2321 | if (current_inferior->last_resume_kind != resume_step | |
2322 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2323 | { | |
2324 | enqueue_one_deferred_signal (event_child, &w); | |
2325 | ||
2326 | if (debug_threads) | |
2327 | fprintf (stderr, | |
2328 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2329 | WSTOPSIG (w), lwpid_of (event_child)); | |
2330 | ||
2331 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2332 | goto retry; | |
2333 | } | |
2334 | } | |
219f2f23 | 2335 | |
fa593d66 PA |
2336 | if (event_child->collecting_fast_tracepoint) |
2337 | { | |
2338 | if (debug_threads) | |
2339 | fprintf (stderr, "\ | |
2340 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2341 | Check if we're already there.\n", | |
2342 | lwpid_of (event_child), | |
2343 | event_child->collecting_fast_tracepoint); | |
2344 | ||
2345 | trace_event = 1; | |
2346 | ||
2347 | event_child->collecting_fast_tracepoint | |
2348 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2349 | ||
2350 | if (event_child->collecting_fast_tracepoint != 1) | |
2351 | { | |
2352 | /* No longer need this breakpoint. */ | |
2353 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2354 | { | |
2355 | if (debug_threads) | |
2356 | fprintf (stderr, | |
2357 | "No longer need exit-jump-pad bkpt; removing it." | |
2358 | "stopping all threads momentarily.\n"); | |
2359 | ||
2360 | /* Other running threads could hit this breakpoint. | |
2361 | We don't handle moribund locations like GDB does, | |
2362 | instead we always pause all threads when removing | |
2363 | breakpoints, so that any step-over or | |
2364 | decr_pc_after_break adjustment is always taken | |
2365 | care of while the breakpoint is still | |
2366 | inserted. */ | |
2367 | stop_all_lwps (1, event_child); | |
2368 | cancel_breakpoints (); | |
2369 | ||
2370 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2371 | event_child->exit_jump_pad_bkpt = NULL; | |
2372 | ||
2373 | unstop_all_lwps (1, event_child); | |
2374 | ||
2375 | gdb_assert (event_child->suspended >= 0); | |
2376 | } | |
2377 | } | |
2378 | ||
2379 | if (event_child->collecting_fast_tracepoint == 0) | |
2380 | { | |
2381 | if (debug_threads) | |
2382 | fprintf (stderr, | |
2383 | "fast tracepoint finished " | |
2384 | "collecting successfully.\n"); | |
2385 | ||
2386 | /* We may have a deferred signal to report. */ | |
2387 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2388 | { | |
2389 | if (debug_threads) | |
2390 | fprintf (stderr, "dequeued one signal.\n"); | |
2391 | } | |
3c11dd79 | 2392 | else |
fa593d66 | 2393 | { |
3c11dd79 PA |
2394 | if (debug_threads) |
2395 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2396 | |
2397 | if (stabilizing_threads) | |
2398 | { | |
2399 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
2400 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2401 | return ptid_of (event_child); | |
2402 | } | |
2403 | } | |
2404 | } | |
6bf5e0ba PA |
2405 | } |
2406 | ||
e471f25b PA |
2407 | /* Check whether GDB would be interested in this event. */ |
2408 | ||
2409 | /* If GDB is not interested in this signal, don't stop other | |
2410 | threads, and don't report it to GDB. Just resume the inferior | |
2411 | right away. We do this for threading-related signals as well as | |
2412 | any that GDB specifically requested we ignore. But never ignore | |
2413 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2414 | stepping - they may require special handling to skip the signal | |
2415 | handler. */ | |
2416 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2417 | thread library? */ | |
2418 | if (WIFSTOPPED (w) | |
2419 | && current_inferior->last_resume_kind != resume_step | |
2420 | && ( | |
1a981360 | 2421 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2422 | (current_process ()->private->thread_db != NULL |
2423 | && (WSTOPSIG (w) == __SIGRTMIN | |
2424 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2425 | || | |
2426 | #endif | |
2427 | (pass_signals[target_signal_from_host (WSTOPSIG (w))] | |
2428 | && !(WSTOPSIG (w) == SIGSTOP | |
2429 | && current_inferior->last_resume_kind == resume_stop)))) | |
2430 | { | |
2431 | siginfo_t info, *info_p; | |
2432 | ||
2433 | if (debug_threads) | |
2434 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2435 | WSTOPSIG (w), lwpid_of (event_child)); | |
2436 | ||
2437 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) | |
2438 | info_p = &info; | |
2439 | else | |
2440 | info_p = NULL; | |
2441 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2442 | WSTOPSIG (w), info_p); | |
2443 | goto retry; | |
2444 | } | |
2445 | ||
2446 | /* If GDB wanted this thread to single step, we always want to | |
2447 | report the SIGTRAP, and let GDB handle it. Watchpoints should | |
2448 | always be reported. So should signals we can't explain. A | |
2449 | SIGTRAP we can't explain could be a GDB breakpoint --- we may or | |
2450 | not support Z0 breakpoints. If we do, we're be able to handle | |
2451 | GDB breakpoints on top of internal breakpoints, by handling the | |
2452 | internal breakpoint and still reporting the event to GDB. If we | |
2453 | don't, we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 2454 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 2455 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 2456 | || event_child->stopped_by_watchpoint |
493e2a69 MS |
2457 | || (!step_over_finished |
2458 | && !bp_explains_trap && !trace_event) | |
9f3a5c85 LM |
2459 | || (gdb_breakpoint_here (event_child->stop_pc) |
2460 | && gdb_condition_true_at_breakpoint (event_child->stop_pc))); | |
6bf5e0ba PA |
2461 | |
2462 | /* We found no reason GDB would want us to stop. We either hit one | |
2463 | of our own breakpoints, or finished an internal step GDB | |
2464 | shouldn't know about. */ | |
2465 | if (!report_to_gdb) | |
2466 | { | |
2467 | if (debug_threads) | |
2468 | { | |
2469 | if (bp_explains_trap) | |
2470 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2471 | if (step_over_finished) | |
2472 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2473 | if (trace_event) |
2474 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
2475 | } |
2476 | ||
2477 | /* We're not reporting this breakpoint to GDB, so apply the | |
2478 | decr_pc_after_break adjustment to the inferior's regcache | |
2479 | ourselves. */ | |
2480 | ||
2481 | if (the_low_target.set_pc != NULL) | |
2482 | { | |
2483 | struct regcache *regcache | |
2484 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2485 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2486 | } | |
2487 | ||
7984d532 PA |
2488 | /* We may have finished stepping over a breakpoint. If so, |
2489 | we've stopped and suspended all LWPs momentarily except the | |
2490 | stepping one. This is where we resume them all again. We're | |
2491 | going to keep waiting, so use proceed, which handles stepping | |
2492 | over the next breakpoint. */ | |
6bf5e0ba PA |
2493 | if (debug_threads) |
2494 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2495 | |
2496 | if (step_over_finished) | |
2497 | unsuspend_all_lwps (event_child); | |
2498 | ||
6bf5e0ba PA |
2499 | proceed_all_lwps (); |
2500 | goto retry; | |
2501 | } | |
2502 | ||
2503 | if (debug_threads) | |
2504 | { | |
8336d594 | 2505 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
2506 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
2507 | if (event_child->stopped_by_watchpoint) | |
2508 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2509 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2510 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2511 | if (debug_threads) |
2512 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2513 | } | |
2514 | ||
2515 | /* Alright, we're going to report a stop. */ | |
2516 | ||
fa593d66 | 2517 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2518 | { |
2519 | /* In all-stop, stop all threads. */ | |
7984d532 | 2520 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2521 | |
2522 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2523 | from among those that have had events. Giving equal priority | |
2524 | to all LWPs that have had events helps prevent | |
2525 | starvation. */ | |
2526 | if (ptid_equal (ptid, minus_one_ptid)) | |
2527 | { | |
2528 | event_child->status_pending_p = 1; | |
2529 | event_child->status_pending = w; | |
2530 | ||
2531 | select_event_lwp (&event_child); | |
2532 | ||
2533 | event_child->status_pending_p = 0; | |
2534 | w = event_child->status_pending; | |
2535 | } | |
2536 | ||
2537 | /* Now that we've selected our final event LWP, cancel any | |
2538 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2539 | See the comment in cancel_breakpoints_callback to find out | |
2540 | why. */ | |
2541 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 PA |
2542 | |
2543 | /* Stabilize threads (move out of jump pads). */ | |
2544 | stabilize_threads (); | |
6bf5e0ba PA |
2545 | } |
2546 | else | |
2547 | { | |
2548 | /* If we just finished a step-over, then all threads had been | |
2549 | momentarily paused. In all-stop, that's fine, we want | |
2550 | threads stopped by now anyway. In non-stop, we need to | |
2551 | re-resume threads that GDB wanted to be running. */ | |
2552 | if (step_over_finished) | |
7984d532 | 2553 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2554 | } |
2555 | ||
5b1c542e | 2556 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2557 | |
8336d594 PA |
2558 | if (current_inferior->last_resume_kind == resume_stop |
2559 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2560 | { |
2561 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2562 | and it stopped cleanly, so report as SIG0. The use of | |
2563 | SIGSTOP is an implementation detail. */ | |
2564 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2565 | } | |
8336d594 PA |
2566 | else if (current_inferior->last_resume_kind == resume_stop |
2567 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2568 | { |
2569 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2570 | but, it stopped for other reasons. */ |
bd99dc85 PA |
2571 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
2572 | } | |
2573 | else | |
2574 | { | |
2575 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
2576 | } | |
2577 | ||
d50171e4 PA |
2578 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2579 | ||
bd99dc85 | 2580 | if (debug_threads) |
95954743 | 2581 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2582 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2583 | ourstatus->kind, |
2584 | ourstatus->value.sig); | |
2585 | ||
6bf5e0ba | 2586 | return ptid_of (event_child); |
bd99dc85 PA |
2587 | } |
2588 | ||
2589 | /* Get rid of any pending event in the pipe. */ | |
2590 | static void | |
2591 | async_file_flush (void) | |
2592 | { | |
2593 | int ret; | |
2594 | char buf; | |
2595 | ||
2596 | do | |
2597 | ret = read (linux_event_pipe[0], &buf, 1); | |
2598 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2599 | } | |
2600 | ||
2601 | /* Put something in the pipe, so the event loop wakes up. */ | |
2602 | static void | |
2603 | async_file_mark (void) | |
2604 | { | |
2605 | int ret; | |
2606 | ||
2607 | async_file_flush (); | |
2608 | ||
2609 | do | |
2610 | ret = write (linux_event_pipe[1], "+", 1); | |
2611 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2612 | ||
2613 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2614 | be awakened anyway. */ | |
2615 | } | |
2616 | ||
95954743 PA |
2617 | static ptid_t |
2618 | linux_wait (ptid_t ptid, | |
2619 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2620 | { |
95954743 | 2621 | ptid_t event_ptid; |
bd99dc85 PA |
2622 | |
2623 | if (debug_threads) | |
95954743 | 2624 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2625 | |
2626 | /* Flush the async file first. */ | |
2627 | if (target_is_async_p ()) | |
2628 | async_file_flush (); | |
2629 | ||
95954743 | 2630 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2631 | |
2632 | /* If at least one stop was reported, there may be more. A single | |
2633 | SIGCHLD can signal more than one child stop. */ | |
2634 | if (target_is_async_p () | |
2635 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2636 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2637 | async_file_mark (); |
2638 | ||
2639 | return event_ptid; | |
da6d8c04 DJ |
2640 | } |
2641 | ||
c5f62d5f | 2642 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2643 | |
2644 | static int | |
a1928bad | 2645 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2646 | { |
c5f62d5f DE |
2647 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2648 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2649 | |
c5f62d5f DE |
2650 | #ifdef __NR_tkill |
2651 | { | |
2652 | static int tkill_failed; | |
fd500816 | 2653 | |
c5f62d5f DE |
2654 | if (!tkill_failed) |
2655 | { | |
2656 | int ret; | |
2657 | ||
2658 | errno = 0; | |
2659 | ret = syscall (__NR_tkill, lwpid, signo); | |
2660 | if (errno != ENOSYS) | |
2661 | return ret; | |
2662 | tkill_failed = 1; | |
2663 | } | |
2664 | } | |
fd500816 DJ |
2665 | #endif |
2666 | ||
2667 | return kill (lwpid, signo); | |
2668 | } | |
2669 | ||
964e4306 PA |
2670 | void |
2671 | linux_stop_lwp (struct lwp_info *lwp) | |
2672 | { | |
2673 | send_sigstop (lwp); | |
2674 | } | |
2675 | ||
0d62e5e8 | 2676 | static void |
02fc4de7 | 2677 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2678 | { |
bd99dc85 | 2679 | int pid; |
0d62e5e8 | 2680 | |
bd99dc85 PA |
2681 | pid = lwpid_of (lwp); |
2682 | ||
0d62e5e8 DJ |
2683 | /* If we already have a pending stop signal for this process, don't |
2684 | send another. */ | |
54a0b537 | 2685 | if (lwp->stop_expected) |
0d62e5e8 | 2686 | { |
ae13219e | 2687 | if (debug_threads) |
bd99dc85 | 2688 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2689 | |
0d62e5e8 DJ |
2690 | return; |
2691 | } | |
2692 | ||
2693 | if (debug_threads) | |
bd99dc85 | 2694 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2695 | |
d50171e4 | 2696 | lwp->stop_expected = 1; |
bd99dc85 | 2697 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2698 | } |
2699 | ||
7984d532 PA |
2700 | static int |
2701 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2702 | { |
2703 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2704 | ||
7984d532 PA |
2705 | /* Ignore EXCEPT. */ |
2706 | if (lwp == except) | |
2707 | return 0; | |
2708 | ||
02fc4de7 | 2709 | if (lwp->stopped) |
7984d532 | 2710 | return 0; |
02fc4de7 PA |
2711 | |
2712 | send_sigstop (lwp); | |
7984d532 PA |
2713 | return 0; |
2714 | } | |
2715 | ||
2716 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2717 | yet. */ | |
2718 | static int | |
2719 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2720 | void *except) | |
2721 | { | |
2722 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2723 | ||
2724 | /* Ignore EXCEPT. */ | |
2725 | if (lwp == except) | |
2726 | return 0; | |
2727 | ||
2728 | lwp->suspended++; | |
2729 | ||
2730 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2731 | } |
2732 | ||
95954743 PA |
2733 | static void |
2734 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2735 | { | |
2736 | /* It's dead, really. */ | |
2737 | lwp->dead = 1; | |
2738 | ||
2739 | /* Store the exit status for later. */ | |
2740 | lwp->status_pending_p = 1; | |
2741 | lwp->status_pending = wstat; | |
2742 | ||
95954743 PA |
2743 | /* Prevent trying to stop it. */ |
2744 | lwp->stopped = 1; | |
2745 | ||
2746 | /* No further stops are expected from a dead lwp. */ | |
2747 | lwp->stop_expected = 0; | |
2748 | } | |
2749 | ||
0d62e5e8 DJ |
2750 | static void |
2751 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2752 | { | |
54a0b537 | 2753 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2754 | struct thread_info *saved_inferior; |
a1928bad | 2755 | int wstat; |
95954743 PA |
2756 | ptid_t saved_tid; |
2757 | ptid_t ptid; | |
d50171e4 | 2758 | int pid; |
0d62e5e8 | 2759 | |
54a0b537 | 2760 | if (lwp->stopped) |
d50171e4 PA |
2761 | { |
2762 | if (debug_threads) | |
2763 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2764 | lwpid_of (lwp)); | |
2765 | return; | |
2766 | } | |
0d62e5e8 DJ |
2767 | |
2768 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2769 | if (saved_inferior != NULL) |
2770 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2771 | else | |
95954743 | 2772 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2773 | |
95954743 | 2774 | ptid = lwp->head.id; |
bd99dc85 | 2775 | |
d50171e4 PA |
2776 | if (debug_threads) |
2777 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2778 | ||
2779 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2780 | |
2781 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2782 | and record the pending SIGSTOP. If the process exited, just | |
2783 | return. */ | |
d50171e4 | 2784 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2785 | { |
2786 | if (debug_threads) | |
d50171e4 PA |
2787 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2788 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2789 | |
d50171e4 | 2790 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2791 | { |
2792 | if (debug_threads) | |
d50171e4 PA |
2793 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2794 | lwpid_of (lwp), wstat); | |
2795 | ||
c35fafde PA |
2796 | lwp->status_pending_p = 1; |
2797 | lwp->status_pending = wstat; | |
2798 | } | |
0d62e5e8 | 2799 | } |
d50171e4 | 2800 | else |
95954743 PA |
2801 | { |
2802 | if (debug_threads) | |
d50171e4 | 2803 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2804 | |
d50171e4 PA |
2805 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2806 | if (lwp) | |
2807 | { | |
2808 | /* Leave this status pending for the next time we're able to | |
2809 | report it. In the mean time, we'll report this lwp as | |
2810 | dead to GDB, so GDB doesn't try to read registers and | |
2811 | memory from it. This can only happen if this was the | |
2812 | last thread of the process; otherwise, PID is removed | |
2813 | from the thread tables before linux_wait_for_event | |
2814 | returns. */ | |
2815 | mark_lwp_dead (lwp, wstat); | |
2816 | } | |
95954743 | 2817 | } |
0d62e5e8 | 2818 | |
bd99dc85 | 2819 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2820 | current_inferior = saved_inferior; |
2821 | else | |
2822 | { | |
2823 | if (debug_threads) | |
2824 | fprintf (stderr, "Previously current thread died.\n"); | |
2825 | ||
bd99dc85 PA |
2826 | if (non_stop) |
2827 | { | |
2828 | /* We can't change the current inferior behind GDB's back, | |
2829 | otherwise, a subsequent command may apply to the wrong | |
2830 | process. */ | |
2831 | current_inferior = NULL; | |
2832 | } | |
2833 | else | |
2834 | { | |
2835 | /* Set a valid thread as current. */ | |
2836 | set_desired_inferior (0); | |
2837 | } | |
0d62e5e8 DJ |
2838 | } |
2839 | } | |
2840 | ||
fa593d66 PA |
2841 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
2842 | move it out, because we need to report the stop event to GDB. For | |
2843 | example, if the user puts a breakpoint in the jump pad, it's | |
2844 | because she wants to debug it. */ | |
2845 | ||
2846 | static int | |
2847 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
2848 | { | |
2849 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2850 | struct thread_info *thread = get_lwp_thread (lwp); | |
2851 | ||
2852 | gdb_assert (lwp->suspended == 0); | |
2853 | gdb_assert (lwp->stopped); | |
2854 | ||
2855 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
2856 | return (supports_fast_tracepoints () | |
2857 | && in_process_agent_loaded () | |
2858 | && (gdb_breakpoint_here (lwp->stop_pc) | |
2859 | || lwp->stopped_by_watchpoint | |
2860 | || thread->last_resume_kind == resume_step) | |
2861 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
2862 | } | |
2863 | ||
2864 | static void | |
2865 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
2866 | { | |
2867 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2868 | struct thread_info *thread = get_lwp_thread (lwp); | |
2869 | int *wstat; | |
2870 | ||
2871 | gdb_assert (lwp->suspended == 0); | |
2872 | gdb_assert (lwp->stopped); | |
2873 | ||
2874 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
2875 | ||
2876 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
2877 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
2878 | && !lwp->stopped_by_watchpoint | |
2879 | && thread->last_resume_kind != resume_step | |
2880 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
2881 | { | |
2882 | if (debug_threads) | |
2883 | fprintf (stderr, | |
2884 | "LWP %ld needs stabilizing (in jump pad)\n", | |
2885 | lwpid_of (lwp)); | |
2886 | ||
2887 | if (wstat) | |
2888 | { | |
2889 | lwp->status_pending_p = 0; | |
2890 | enqueue_one_deferred_signal (lwp, wstat); | |
2891 | ||
2892 | if (debug_threads) | |
2893 | fprintf (stderr, | |
2894 | "Signal %d for LWP %ld deferred " | |
2895 | "(in jump pad)\n", | |
2896 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
2897 | } | |
2898 | ||
2899 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
2900 | } | |
2901 | else | |
2902 | lwp->suspended++; | |
2903 | } | |
2904 | ||
2905 | static int | |
2906 | lwp_running (struct inferior_list_entry *entry, void *data) | |
2907 | { | |
2908 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2909 | ||
2910 | if (lwp->dead) | |
2911 | return 0; | |
2912 | if (lwp->stopped) | |
2913 | return 0; | |
2914 | return 1; | |
2915 | } | |
2916 | ||
7984d532 PA |
2917 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
2918 | If SUSPEND, then also increase the suspend count of every LWP, | |
2919 | except EXCEPT. */ | |
2920 | ||
0d62e5e8 | 2921 | static void |
7984d532 | 2922 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 DJ |
2923 | { |
2924 | stopping_threads = 1; | |
7984d532 PA |
2925 | |
2926 | if (suspend) | |
2927 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
2928 | else | |
2929 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 2930 | for_each_inferior (&all_lwps, wait_for_sigstop); |
0d62e5e8 DJ |
2931 | stopping_threads = 0; |
2932 | } | |
2933 | ||
da6d8c04 DJ |
2934 | /* Resume execution of the inferior process. |
2935 | If STEP is nonzero, single-step it. | |
2936 | If SIGNAL is nonzero, give it that signal. */ | |
2937 | ||
ce3a066d | 2938 | static void |
2acc282a | 2939 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 2940 | int step, int signal, siginfo_t *info) |
da6d8c04 | 2941 | { |
0d62e5e8 | 2942 | struct thread_info *saved_inferior; |
fa593d66 | 2943 | int fast_tp_collecting; |
0d62e5e8 | 2944 | |
54a0b537 | 2945 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
2946 | return; |
2947 | ||
fa593d66 PA |
2948 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
2949 | ||
2950 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
2951 | ||
219f2f23 PA |
2952 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
2953 | user used the "jump" command, or "set $pc = foo"). */ | |
2954 | if (lwp->stop_pc != get_pc (lwp)) | |
2955 | { | |
2956 | /* Collecting 'while-stepping' actions doesn't make sense | |
2957 | anymore. */ | |
2958 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
2959 | } | |
2960 | ||
0d62e5e8 DJ |
2961 | /* If we have pending signals or status, and a new signal, enqueue the |
2962 | signal. Also enqueue the signal if we are waiting to reinsert a | |
2963 | breakpoint; it will be picked up again below. */ | |
2964 | if (signal != 0 | |
fa593d66 PA |
2965 | && (lwp->status_pending_p |
2966 | || lwp->pending_signals != NULL | |
2967 | || lwp->bp_reinsert != 0 | |
2968 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
2969 | { |
2970 | struct pending_signals *p_sig; | |
bca929d3 | 2971 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 2972 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 2973 | p_sig->signal = signal; |
32ca6d61 DJ |
2974 | if (info == NULL) |
2975 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2976 | else | |
2977 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 2978 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
2979 | } |
2980 | ||
d50171e4 PA |
2981 | if (lwp->status_pending_p) |
2982 | { | |
2983 | if (debug_threads) | |
2984 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
2985 | " has pending status\n", | |
2986 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
2987 | lwp->stop_expected ? "expected" : "not expected"); | |
2988 | return; | |
2989 | } | |
0d62e5e8 DJ |
2990 | |
2991 | saved_inferior = current_inferior; | |
54a0b537 | 2992 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
2993 | |
2994 | if (debug_threads) | |
1b3f6016 | 2995 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 2996 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 2997 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
2998 | |
2999 | /* This bit needs some thinking about. If we get a signal that | |
3000 | we must report while a single-step reinsert is still pending, | |
3001 | we often end up resuming the thread. It might be better to | |
3002 | (ew) allow a stack of pending events; then we could be sure that | |
3003 | the reinsert happened right away and not lose any signals. | |
3004 | ||
3005 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3006 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3007 | complete correctness, so it won't solve that problem. It may be |
3008 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3009 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3010 | { |
3011 | if (debug_threads) | |
d50171e4 PA |
3012 | fprintf (stderr, " pending reinsert at 0x%s\n", |
3013 | paddress (lwp->bp_reinsert)); | |
3014 | ||
3015 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
3016 | { | |
fa593d66 PA |
3017 | if (fast_tp_collecting == 0) |
3018 | { | |
3019 | if (step == 0) | |
3020 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3021 | if (lwp->suspended) | |
3022 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3023 | lwp->suspended); | |
3024 | } | |
d50171e4 PA |
3025 | |
3026 | step = 1; | |
3027 | } | |
0d62e5e8 DJ |
3028 | |
3029 | /* Postpone any pending signal. It was enqueued above. */ | |
3030 | signal = 0; | |
3031 | } | |
3032 | ||
fa593d66 PA |
3033 | if (fast_tp_collecting == 1) |
3034 | { | |
3035 | if (debug_threads) | |
3036 | fprintf (stderr, "\ | |
3037 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
3038 | lwpid_of (lwp)); | |
3039 | ||
3040 | /* Postpone any pending signal. It was enqueued above. */ | |
3041 | signal = 0; | |
3042 | } | |
3043 | else if (fast_tp_collecting == 2) | |
3044 | { | |
3045 | if (debug_threads) | |
3046 | fprintf (stderr, "\ | |
3047 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
3048 | lwpid_of (lwp)); | |
3049 | ||
3050 | if (can_hardware_single_step ()) | |
3051 | step = 1; | |
3052 | else | |
3053 | fatal ("moving out of jump pad single-stepping" | |
3054 | " not implemented on this target"); | |
3055 | ||
3056 | /* Postpone any pending signal. It was enqueued above. */ | |
3057 | signal = 0; | |
3058 | } | |
3059 | ||
219f2f23 PA |
3060 | /* If we have while-stepping actions in this thread set it stepping. |
3061 | If we have a signal to deliver, it may or may not be set to | |
3062 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3063 | while-stepping into a signal handler. A possible smart thing to | |
3064 | do would be to set an internal breakpoint at the signal return | |
3065 | address, continue, and carry on catching this while-stepping | |
3066 | action only when that breakpoint is hit. A future | |
3067 | enhancement. */ | |
3068 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
3069 | && can_hardware_single_step ()) | |
3070 | { | |
3071 | if (debug_threads) | |
3072 | fprintf (stderr, | |
3073 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
3074 | lwpid_of (lwp)); | |
3075 | step = 1; | |
3076 | } | |
3077 | ||
aa691b87 | 3078 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3079 | { |
442ea881 PA |
3080 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3081 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 3082 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3083 | } |
3084 | ||
fa593d66 PA |
3085 | /* If we have pending signals, consume one unless we are trying to |
3086 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3087 | collect. */ | |
3088 | if (lwp->pending_signals != NULL | |
3089 | && lwp->bp_reinsert == 0 | |
3090 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3091 | { |
3092 | struct pending_signals **p_sig; | |
3093 | ||
54a0b537 | 3094 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3095 | while ((*p_sig)->prev != NULL) |
3096 | p_sig = &(*p_sig)->prev; | |
3097 | ||
3098 | signal = (*p_sig)->signal; | |
32ca6d61 | 3099 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 3100 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 3101 | |
0d62e5e8 DJ |
3102 | free (*p_sig); |
3103 | *p_sig = NULL; | |
3104 | } | |
3105 | ||
aa5ca48f DE |
3106 | if (the_low_target.prepare_to_resume != NULL) |
3107 | the_low_target.prepare_to_resume (lwp); | |
3108 | ||
0d62e5e8 | 3109 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 3110 | get_lwp_thread (lwp)); |
da6d8c04 | 3111 | errno = 0; |
54a0b537 | 3112 | lwp->stopped = 0; |
c3adc08c | 3113 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3114 | lwp->stepping = step; |
14ce3065 DE |
3115 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
3116 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3117 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3118 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
3119 | |
3120 | current_inferior = saved_inferior; | |
da6d8c04 | 3121 | if (errno) |
3221518c UW |
3122 | { |
3123 | /* ESRCH from ptrace either means that the thread was already | |
3124 | running (an error) or that it is gone (a race condition). If | |
3125 | it's gone, we will get a notification the next time we wait, | |
3126 | so we can ignore the error. We could differentiate these | |
3127 | two, but it's tricky without waiting; the thread still exists | |
3128 | as a zombie, so sending it signal 0 would succeed. So just | |
3129 | ignore ESRCH. */ | |
3130 | if (errno == ESRCH) | |
3131 | return; | |
3132 | ||
3133 | perror_with_name ("ptrace"); | |
3134 | } | |
da6d8c04 DJ |
3135 | } |
3136 | ||
2bd7c093 PA |
3137 | struct thread_resume_array |
3138 | { | |
3139 | struct thread_resume *resume; | |
3140 | size_t n; | |
3141 | }; | |
64386c31 DJ |
3142 | |
3143 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
3144 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
3145 | resume request. | |
3146 | ||
3147 | This algorithm is O(threads * resume elements), but resume elements | |
3148 | is small (and will remain small at least until GDB supports thread | |
3149 | suspension). */ | |
2bd7c093 PA |
3150 | static int |
3151 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3152 | { |
54a0b537 | 3153 | struct lwp_info *lwp; |
64386c31 | 3154 | struct thread_info *thread; |
5544ad89 | 3155 | int ndx; |
2bd7c093 | 3156 | struct thread_resume_array *r; |
64386c31 DJ |
3157 | |
3158 | thread = (struct thread_info *) entry; | |
54a0b537 | 3159 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3160 | r = arg; |
64386c31 | 3161 | |
2bd7c093 | 3162 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3163 | { |
3164 | ptid_t ptid = r->resume[ndx].thread; | |
3165 | if (ptid_equal (ptid, minus_one_ptid) | |
3166 | || ptid_equal (ptid, entry->id) | |
3167 | || (ptid_is_pid (ptid) | |
3168 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
3169 | || (ptid_get_lwp (ptid) == -1 | |
3170 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
3171 | { | |
d50171e4 | 3172 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3173 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3174 | { |
3175 | if (debug_threads) | |
3176 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3177 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3178 | ? "stopped" | |
3179 | : "stopping", | |
3180 | lwpid_of (lwp)); | |
3181 | ||
3182 | continue; | |
3183 | } | |
3184 | ||
95954743 | 3185 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3186 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 PA |
3187 | |
3188 | /* If we had a deferred signal to report, dequeue one now. | |
3189 | This can happen if LWP gets more than one signal while | |
3190 | trying to get out of a jump pad. */ | |
3191 | if (lwp->stopped | |
3192 | && !lwp->status_pending_p | |
3193 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3194 | { | |
3195 | lwp->status_pending_p = 1; | |
3196 | ||
3197 | if (debug_threads) | |
3198 | fprintf (stderr, | |
3199 | "Dequeueing deferred signal %d for LWP %ld, " | |
3200 | "leaving status pending.\n", | |
3201 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3202 | } | |
3203 | ||
95954743 PA |
3204 | return 0; |
3205 | } | |
3206 | } | |
2bd7c093 PA |
3207 | |
3208 | /* No resume action for this thread. */ | |
3209 | lwp->resume = NULL; | |
64386c31 | 3210 | |
2bd7c093 | 3211 | return 0; |
5544ad89 DJ |
3212 | } |
3213 | ||
5544ad89 | 3214 | |
bd99dc85 PA |
3215 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3216 | static int | |
3217 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3218 | { |
bd99dc85 | 3219 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3220 | |
bd99dc85 PA |
3221 | /* LWPs which will not be resumed are not interesting, because |
3222 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3223 | if (lwp->resume == NULL) |
bd99dc85 | 3224 | return 0; |
64386c31 | 3225 | |
bd99dc85 | 3226 | if (lwp->status_pending_p) |
d50171e4 PA |
3227 | * (int *) flag_p = 1; |
3228 | ||
3229 | return 0; | |
3230 | } | |
3231 | ||
3232 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3233 | internal breakpoint that we need to step over. It assumes that any | |
3234 | required STOP_PC adjustment has already been propagated to the | |
3235 | inferior's regcache. */ | |
3236 | ||
3237 | static int | |
3238 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3239 | { | |
3240 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3241 | struct thread_info *thread; |
d50171e4 PA |
3242 | struct thread_info *saved_inferior; |
3243 | CORE_ADDR pc; | |
3244 | ||
3245 | /* LWPs which will not be resumed are not interesting, because we | |
3246 | might not wait for them next time through linux_wait. */ | |
3247 | ||
3248 | if (!lwp->stopped) | |
3249 | { | |
3250 | if (debug_threads) | |
3251 | fprintf (stderr, | |
3252 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3253 | lwpid_of (lwp)); | |
3254 | return 0; | |
3255 | } | |
3256 | ||
8336d594 PA |
3257 | thread = get_lwp_thread (lwp); |
3258 | ||
3259 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3260 | { |
3261 | if (debug_threads) | |
3262 | fprintf (stderr, | |
3263 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3264 | lwpid_of (lwp)); | |
3265 | return 0; | |
3266 | } | |
3267 | ||
7984d532 PA |
3268 | gdb_assert (lwp->suspended >= 0); |
3269 | ||
3270 | if (lwp->suspended) | |
3271 | { | |
3272 | if (debug_threads) | |
3273 | fprintf (stderr, | |
3274 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3275 | lwpid_of (lwp)); | |
3276 | return 0; | |
3277 | } | |
3278 | ||
d50171e4 PA |
3279 | if (!lwp->need_step_over) |
3280 | { | |
3281 | if (debug_threads) | |
3282 | fprintf (stderr, | |
3283 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3284 | } | |
5544ad89 | 3285 | |
bd99dc85 | 3286 | if (lwp->status_pending_p) |
d50171e4 PA |
3287 | { |
3288 | if (debug_threads) | |
3289 | fprintf (stderr, | |
3290 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3291 | lwpid_of (lwp)); | |
3292 | return 0; | |
3293 | } | |
3294 | ||
3295 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3296 | or we have. */ | |
3297 | pc = get_pc (lwp); | |
3298 | ||
3299 | /* If the PC has changed since we stopped, then don't do anything, | |
3300 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3301 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3302 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3303 | command, or poked thread's registers herself. */ | |
3304 | if (pc != lwp->stop_pc) | |
3305 | { | |
3306 | if (debug_threads) | |
3307 | fprintf (stderr, | |
3308 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3309 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3310 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3311 | ||
3312 | lwp->need_step_over = 0; | |
3313 | return 0; | |
3314 | } | |
3315 | ||
3316 | saved_inferior = current_inferior; | |
8336d594 | 3317 | current_inferior = thread; |
d50171e4 | 3318 | |
8b07ae33 | 3319 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3320 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3321 | { |
8b07ae33 | 3322 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3323 | though. If the condition is being evaluated on the target's side |
3324 | and it evaluate to false, step over this breakpoint as well. */ | |
3325 | if (gdb_breakpoint_here (pc) | |
3326 | && gdb_condition_true_at_breakpoint (pc)) | |
8b07ae33 PA |
3327 | { |
3328 | if (debug_threads) | |
3329 | fprintf (stderr, | |
3330 | "Need step over [LWP %ld]? yes, but found" | |
3331 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3332 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3333 | |
8b07ae33 PA |
3334 | current_inferior = saved_inferior; |
3335 | return 0; | |
3336 | } | |
3337 | else | |
3338 | { | |
3339 | if (debug_threads) | |
3340 | fprintf (stderr, | |
493e2a69 MS |
3341 | "Need step over [LWP %ld]? yes, " |
3342 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3343 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3344 | |
8b07ae33 PA |
3345 | /* We've found an lwp that needs stepping over --- return 1 so |
3346 | that find_inferior stops looking. */ | |
3347 | current_inferior = saved_inferior; | |
3348 | ||
3349 | /* If the step over is cancelled, this is set again. */ | |
3350 | lwp->need_step_over = 0; | |
3351 | return 1; | |
3352 | } | |
d50171e4 PA |
3353 | } |
3354 | ||
3355 | current_inferior = saved_inferior; | |
3356 | ||
3357 | if (debug_threads) | |
3358 | fprintf (stderr, | |
3359 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3360 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3361 | |
bd99dc85 | 3362 | return 0; |
5544ad89 DJ |
3363 | } |
3364 | ||
d50171e4 PA |
3365 | /* Start a step-over operation on LWP. When LWP stopped at a |
3366 | breakpoint, to make progress, we need to remove the breakpoint out | |
3367 | of the way. If we let other threads run while we do that, they may | |
3368 | pass by the breakpoint location and miss hitting it. To avoid | |
3369 | that, a step-over momentarily stops all threads while LWP is | |
3370 | single-stepped while the breakpoint is temporarily uninserted from | |
3371 | the inferior. When the single-step finishes, we reinsert the | |
3372 | breakpoint, and let all threads that are supposed to be running, | |
3373 | run again. | |
3374 | ||
3375 | On targets that don't support hardware single-step, we don't | |
3376 | currently support full software single-stepping. Instead, we only | |
3377 | support stepping over the thread event breakpoint, by asking the | |
3378 | low target where to place a reinsert breakpoint. Since this | |
3379 | routine assumes the breakpoint being stepped over is a thread event | |
3380 | breakpoint, it usually assumes the return address of the current | |
3381 | function is a good enough place to set the reinsert breakpoint. */ | |
3382 | ||
3383 | static int | |
3384 | start_step_over (struct lwp_info *lwp) | |
3385 | { | |
3386 | struct thread_info *saved_inferior; | |
3387 | CORE_ADDR pc; | |
3388 | int step; | |
3389 | ||
3390 | if (debug_threads) | |
3391 | fprintf (stderr, | |
3392 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3393 | lwpid_of (lwp)); | |
3394 | ||
7984d532 PA |
3395 | stop_all_lwps (1, lwp); |
3396 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3397 | |
3398 | if (debug_threads) | |
3399 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3400 | ||
3401 | /* Note, we should always reach here with an already adjusted PC, | |
3402 | either by GDB (if we're resuming due to GDB's request), or by our | |
3403 | caller, if we just finished handling an internal breakpoint GDB | |
3404 | shouldn't care about. */ | |
3405 | pc = get_pc (lwp); | |
3406 | ||
3407 | saved_inferior = current_inferior; | |
3408 | current_inferior = get_lwp_thread (lwp); | |
3409 | ||
3410 | lwp->bp_reinsert = pc; | |
3411 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3412 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3413 | |
3414 | if (can_hardware_single_step ()) | |
3415 | { | |
3416 | step = 1; | |
3417 | } | |
3418 | else | |
3419 | { | |
3420 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3421 | set_reinsert_breakpoint (raddr); | |
3422 | step = 0; | |
3423 | } | |
3424 | ||
3425 | current_inferior = saved_inferior; | |
3426 | ||
3427 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3428 | ||
3429 | /* Require next event from this LWP. */ | |
3430 | step_over_bkpt = lwp->head.id; | |
3431 | return 1; | |
3432 | } | |
3433 | ||
3434 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3435 | start_step_over, if still there, and delete any reinsert | |
3436 | breakpoints we've set, on non hardware single-step targets. */ | |
3437 | ||
3438 | static int | |
3439 | finish_step_over (struct lwp_info *lwp) | |
3440 | { | |
3441 | if (lwp->bp_reinsert != 0) | |
3442 | { | |
3443 | if (debug_threads) | |
3444 | fprintf (stderr, "Finished step over.\n"); | |
3445 | ||
3446 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3447 | may be no breakpoint to reinsert there by now. */ | |
3448 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3449 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3450 | |
3451 | lwp->bp_reinsert = 0; | |
3452 | ||
3453 | /* Delete any software-single-step reinsert breakpoints. No | |
3454 | longer needed. We don't have to worry about other threads | |
3455 | hitting this trap, and later not being able to explain it, | |
3456 | because we were stepping over a breakpoint, and we hold all | |
3457 | threads but LWP stopped while doing that. */ | |
3458 | if (!can_hardware_single_step ()) | |
3459 | delete_reinsert_breakpoints (); | |
3460 | ||
3461 | step_over_bkpt = null_ptid; | |
3462 | return 1; | |
3463 | } | |
3464 | else | |
3465 | return 0; | |
3466 | } | |
3467 | ||
5544ad89 DJ |
3468 | /* This function is called once per thread. We check the thread's resume |
3469 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3470 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3471 | |
bd99dc85 PA |
3472 | For threads which we aren't explicitly told otherwise, we preserve |
3473 | the stepping flag; this is used for stepping over gdbserver-placed | |
3474 | breakpoints. | |
3475 | ||
3476 | If pending_flags was set in any thread, we queue any needed | |
3477 | signals, since we won't actually resume. We already have a pending | |
3478 | event to report, so we don't need to preserve any step requests; | |
3479 | they should be re-issued if necessary. */ | |
3480 | ||
3481 | static int | |
3482 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3483 | { |
54a0b537 | 3484 | struct lwp_info *lwp; |
5544ad89 | 3485 | struct thread_info *thread; |
bd99dc85 | 3486 | int step; |
d50171e4 PA |
3487 | int leave_all_stopped = * (int *) arg; |
3488 | int leave_pending; | |
5544ad89 DJ |
3489 | |
3490 | thread = (struct thread_info *) entry; | |
54a0b537 | 3491 | lwp = get_thread_lwp (thread); |
5544ad89 | 3492 | |
2bd7c093 | 3493 | if (lwp->resume == NULL) |
bd99dc85 | 3494 | return 0; |
5544ad89 | 3495 | |
bd99dc85 | 3496 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3497 | { |
bd99dc85 | 3498 | if (debug_threads) |
d50171e4 | 3499 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3500 | |
3501 | if (!lwp->stopped) | |
3502 | { | |
3503 | if (debug_threads) | |
d50171e4 | 3504 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3505 | |
d50171e4 PA |
3506 | /* Stop the thread, and wait for the event asynchronously, |
3507 | through the event loop. */ | |
02fc4de7 | 3508 | send_sigstop (lwp); |
bd99dc85 PA |
3509 | } |
3510 | else | |
3511 | { | |
3512 | if (debug_threads) | |
d50171e4 PA |
3513 | fprintf (stderr, "already stopped LWP %ld\n", |
3514 | lwpid_of (lwp)); | |
3515 | ||
3516 | /* The LWP may have been stopped in an internal event that | |
3517 | was not meant to be notified back to GDB (e.g., gdbserver | |
3518 | breakpoint), so we should be reporting a stop event in | |
3519 | this case too. */ | |
3520 | ||
3521 | /* If the thread already has a pending SIGSTOP, this is a | |
3522 | no-op. Otherwise, something later will presumably resume | |
3523 | the thread and this will cause it to cancel any pending | |
3524 | operation, due to last_resume_kind == resume_stop. If | |
3525 | the thread already has a pending status to report, we | |
3526 | will still report it the next time we wait - see | |
3527 | status_pending_p_callback. */ | |
1a981360 PA |
3528 | |
3529 | /* If we already have a pending signal to report, then | |
3530 | there's no need to queue a SIGSTOP, as this means we're | |
3531 | midway through moving the LWP out of the jumppad, and we | |
3532 | will report the pending signal as soon as that is | |
3533 | finished. */ | |
3534 | if (lwp->pending_signals_to_report == NULL) | |
3535 | send_sigstop (lwp); | |
bd99dc85 | 3536 | } |
32ca6d61 | 3537 | |
bd99dc85 PA |
3538 | /* For stop requests, we're done. */ |
3539 | lwp->resume = NULL; | |
fc7238bb | 3540 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3541 | return 0; |
5544ad89 DJ |
3542 | } |
3543 | ||
bd99dc85 PA |
3544 | /* If this thread which is about to be resumed has a pending status, |
3545 | then don't resume any threads - we can just report the pending | |
3546 | status. Make sure to queue any signals that would otherwise be | |
3547 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3548 | thread has a pending status. If there's a thread that needs the |
3549 | step-over-breakpoint dance, then don't resume any other thread | |
3550 | but that particular one. */ | |
3551 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3552 | |
d50171e4 | 3553 | if (!leave_pending) |
bd99dc85 PA |
3554 | { |
3555 | if (debug_threads) | |
3556 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3557 | |
d50171e4 | 3558 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3559 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3560 | } |
3561 | else | |
3562 | { | |
3563 | if (debug_threads) | |
3564 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3565 | |
bd99dc85 PA |
3566 | /* If we have a new signal, enqueue the signal. */ |
3567 | if (lwp->resume->sig != 0) | |
3568 | { | |
3569 | struct pending_signals *p_sig; | |
3570 | p_sig = xmalloc (sizeof (*p_sig)); | |
3571 | p_sig->prev = lwp->pending_signals; | |
3572 | p_sig->signal = lwp->resume->sig; | |
3573 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3574 | ||
3575 | /* If this is the same signal we were previously stopped by, | |
3576 | make sure to queue its siginfo. We can ignore the return | |
3577 | value of ptrace; if it fails, we'll skip | |
3578 | PTRACE_SETSIGINFO. */ | |
3579 | if (WIFSTOPPED (lwp->last_status) | |
3580 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
3581 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
3582 | ||
3583 | lwp->pending_signals = p_sig; | |
3584 | } | |
3585 | } | |
5544ad89 | 3586 | |
fc7238bb | 3587 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3588 | lwp->resume = NULL; |
5544ad89 | 3589 | return 0; |
0d62e5e8 DJ |
3590 | } |
3591 | ||
3592 | static void | |
2bd7c093 | 3593 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3594 | { |
2bd7c093 | 3595 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3596 | struct lwp_info *need_step_over = NULL; |
3597 | int any_pending; | |
3598 | int leave_all_stopped; | |
c6ecbae5 | 3599 | |
2bd7c093 | 3600 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3601 | |
d50171e4 PA |
3602 | /* If there is a thread which would otherwise be resumed, which has |
3603 | a pending status, then don't resume any threads - we can just | |
3604 | report the pending status. Make sure to queue any signals that | |
3605 | would otherwise be sent. In non-stop mode, we'll apply this | |
3606 | logic to each thread individually. We consume all pending events | |
3607 | before considering to start a step-over (in all-stop). */ | |
3608 | any_pending = 0; | |
bd99dc85 | 3609 | if (!non_stop) |
d50171e4 PA |
3610 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3611 | ||
3612 | /* If there is a thread which would otherwise be resumed, which is | |
3613 | stopped at a breakpoint that needs stepping over, then don't | |
3614 | resume any threads - have it step over the breakpoint with all | |
3615 | other threads stopped, then resume all threads again. Make sure | |
3616 | to queue any signals that would otherwise be delivered or | |
3617 | queued. */ | |
3618 | if (!any_pending && supports_breakpoints ()) | |
3619 | need_step_over | |
3620 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3621 | need_step_over_p, NULL); | |
3622 | ||
3623 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3624 | ||
3625 | if (debug_threads) | |
3626 | { | |
3627 | if (need_step_over != NULL) | |
3628 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3629 | else if (any_pending) | |
3630 | fprintf (stderr, | |
3631 | "Not resuming, all-stop and found " | |
3632 | "an LWP with pending status\n"); | |
3633 | else | |
3634 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3635 | } | |
3636 | ||
3637 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3638 | otherwise deliver. */ | |
3639 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3640 | ||
3641 | if (need_step_over) | |
3642 | start_step_over (need_step_over); | |
3643 | } | |
3644 | ||
3645 | /* This function is called once per thread. We check the thread's | |
3646 | last resume request, which will tell us whether to resume, step, or | |
3647 | leave the thread stopped. Any signal the client requested to be | |
3648 | delivered has already been enqueued at this point. | |
3649 | ||
3650 | If any thread that GDB wants running is stopped at an internal | |
3651 | breakpoint that needs stepping over, we start a step-over operation | |
3652 | on that particular thread, and leave all others stopped. */ | |
3653 | ||
7984d532 PA |
3654 | static int |
3655 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3656 | { |
7984d532 | 3657 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3658 | struct thread_info *thread; |
d50171e4 PA |
3659 | int step; |
3660 | ||
7984d532 PA |
3661 | if (lwp == except) |
3662 | return 0; | |
d50171e4 PA |
3663 | |
3664 | if (debug_threads) | |
3665 | fprintf (stderr, | |
3666 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3667 | ||
3668 | if (!lwp->stopped) | |
3669 | { | |
3670 | if (debug_threads) | |
3671 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3672 | return 0; |
d50171e4 PA |
3673 | } |
3674 | ||
8336d594 PA |
3675 | thread = get_lwp_thread (lwp); |
3676 | ||
02fc4de7 PA |
3677 | if (thread->last_resume_kind == resume_stop |
3678 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3679 | { |
3680 | if (debug_threads) | |
02fc4de7 PA |
3681 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3682 | lwpid_of (lwp)); | |
7984d532 | 3683 | return 0; |
d50171e4 PA |
3684 | } |
3685 | ||
3686 | if (lwp->status_pending_p) | |
3687 | { | |
3688 | if (debug_threads) | |
3689 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3690 | lwpid_of (lwp)); | |
7984d532 | 3691 | return 0; |
d50171e4 PA |
3692 | } |
3693 | ||
7984d532 PA |
3694 | gdb_assert (lwp->suspended >= 0); |
3695 | ||
d50171e4 PA |
3696 | if (lwp->suspended) |
3697 | { | |
3698 | if (debug_threads) | |
3699 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3700 | return 0; |
d50171e4 PA |
3701 | } |
3702 | ||
1a981360 PA |
3703 | if (thread->last_resume_kind == resume_stop |
3704 | && lwp->pending_signals_to_report == NULL | |
3705 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3706 | { |
3707 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3708 | last_status.kind check above would catch it, and we wouldn't | |
3709 | reach here. This LWP may have been momentarily paused by a | |
3710 | stop_all_lwps call while handling for example, another LWP's | |
3711 | step-over. In that case, the pending expected SIGSTOP signal | |
3712 | that was queued at vCont;t handling time will have already | |
3713 | been consumed by wait_for_sigstop, and so we need to requeue | |
3714 | another one here. Note that if the LWP already has a SIGSTOP | |
3715 | pending, this is a no-op. */ | |
3716 | ||
3717 | if (debug_threads) | |
3718 | fprintf (stderr, | |
3719 | "Client wants LWP %ld to stop. " | |
3720 | "Making sure it has a SIGSTOP pending\n", | |
3721 | lwpid_of (lwp)); | |
3722 | ||
3723 | send_sigstop (lwp); | |
3724 | } | |
3725 | ||
8336d594 | 3726 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3727 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3728 | return 0; |
3729 | } | |
3730 | ||
3731 | static int | |
3732 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3733 | { | |
3734 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3735 | ||
3736 | if (lwp == except) | |
3737 | return 0; | |
3738 | ||
3739 | lwp->suspended--; | |
3740 | gdb_assert (lwp->suspended >= 0); | |
3741 | ||
3742 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3743 | } |
3744 | ||
3745 | /* When we finish a step-over, set threads running again. If there's | |
3746 | another thread that may need a step-over, now's the time to start | |
3747 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3748 | ||
3749 | static void | |
3750 | proceed_all_lwps (void) | |
3751 | { | |
3752 | struct lwp_info *need_step_over; | |
3753 | ||
3754 | /* If there is a thread which would otherwise be resumed, which is | |
3755 | stopped at a breakpoint that needs stepping over, then don't | |
3756 | resume any threads - have it step over the breakpoint with all | |
3757 | other threads stopped, then resume all threads again. */ | |
3758 | ||
3759 | if (supports_breakpoints ()) | |
3760 | { | |
3761 | need_step_over | |
3762 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3763 | need_step_over_p, NULL); | |
3764 | ||
3765 | if (need_step_over != NULL) | |
3766 | { | |
3767 | if (debug_threads) | |
3768 | fprintf (stderr, "proceed_all_lwps: found " | |
3769 | "thread %ld needing a step-over\n", | |
3770 | lwpid_of (need_step_over)); | |
3771 | ||
3772 | start_step_over (need_step_over); | |
3773 | return; | |
3774 | } | |
3775 | } | |
5544ad89 | 3776 | |
d50171e4 PA |
3777 | if (debug_threads) |
3778 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3779 | ||
7984d532 | 3780 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3781 | } |
3782 | ||
3783 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3784 | pending statuses, are set to run again, except for EXCEPT, if not | |
3785 | NULL. This undoes a stop_all_lwps call. */ | |
3786 | ||
3787 | static void | |
7984d532 | 3788 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3789 | { |
5544ad89 DJ |
3790 | if (debug_threads) |
3791 | { | |
d50171e4 PA |
3792 | if (except) |
3793 | fprintf (stderr, | |
3794 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3795 | else |
d50171e4 PA |
3796 | fprintf (stderr, |
3797 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3798 | } |
3799 | ||
7984d532 PA |
3800 | if (unsuspend) |
3801 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3802 | else | |
3803 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3804 | } |
3805 | ||
3806 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
3807 | |
3808 | int | |
0a30fbc4 | 3809 | register_addr (int regnum) |
da6d8c04 DJ |
3810 | { |
3811 | int addr; | |
3812 | ||
2ec06d2e | 3813 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
3814 | error ("Invalid register number %d.", regnum); |
3815 | ||
2ec06d2e | 3816 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
3817 | |
3818 | return addr; | |
3819 | } | |
3820 | ||
58caa3dc | 3821 | /* Fetch one register. */ |
da6d8c04 | 3822 | static void |
442ea881 | 3823 | fetch_register (struct regcache *regcache, int regno) |
da6d8c04 DJ |
3824 | { |
3825 | CORE_ADDR regaddr; | |
48d93c75 | 3826 | int i, size; |
0d62e5e8 | 3827 | char *buf; |
95954743 | 3828 | int pid; |
da6d8c04 | 3829 | |
2ec06d2e | 3830 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 3831 | return; |
2ec06d2e | 3832 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 3833 | return; |
da6d8c04 | 3834 | |
0a30fbc4 DJ |
3835 | regaddr = register_addr (regno); |
3836 | if (regaddr == -1) | |
3837 | return; | |
95954743 | 3838 | |
1b3f6016 | 3839 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
50275556 | 3840 | & -sizeof (PTRACE_XFER_TYPE)); |
48d93c75 | 3841 | buf = alloca (size); |
50275556 MR |
3842 | |
3843 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
48d93c75 | 3844 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 DJ |
3845 | { |
3846 | errno = 0; | |
0d62e5e8 | 3847 | *(PTRACE_XFER_TYPE *) (buf + i) = |
14ce3065 DE |
3848 | ptrace (PTRACE_PEEKUSER, pid, |
3849 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3850 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3851 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
da6d8c04 DJ |
3852 | regaddr += sizeof (PTRACE_XFER_TYPE); |
3853 | if (errno != 0) | |
f52cd8cd | 3854 | error ("reading register %d: %s", regno, strerror (errno)); |
da6d8c04 | 3855 | } |
ee1a7ae4 UW |
3856 | |
3857 | if (the_low_target.supply_ptrace_register) | |
442ea881 | 3858 | the_low_target.supply_ptrace_register (regcache, regno, buf); |
5a1f5858 | 3859 | else |
442ea881 | 3860 | supply_register (regcache, regno, buf); |
da6d8c04 DJ |
3861 | } |
3862 | ||
7325beb4 MR |
3863 | /* Store one register. */ |
3864 | static void | |
3865 | store_register (struct regcache *regcache, int regno) | |
3866 | { | |
3867 | CORE_ADDR regaddr; | |
3868 | int i, size; | |
3869 | char *buf; | |
3870 | int pid; | |
3871 | ||
3872 | if (regno >= the_low_target.num_regs) | |
3873 | return; | |
50275556 | 3874 | if ((*the_low_target.cannot_store_register) (regno)) |
7325beb4 MR |
3875 | return; |
3876 | ||
3877 | regaddr = register_addr (regno); | |
3878 | if (regaddr == -1) | |
3879 | return; | |
50275556 MR |
3880 | |
3881 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
3882 | & -sizeof (PTRACE_XFER_TYPE)); | |
7325beb4 MR |
3883 | buf = alloca (size); |
3884 | memset (buf, 0, size); | |
3885 | ||
3886 | if (the_low_target.collect_ptrace_register) | |
3887 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
3888 | else | |
3889 | collect_register (regcache, regno, buf); | |
3890 | ||
3891 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
3892 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
3893 | { | |
3894 | errno = 0; | |
3895 | ptrace (PTRACE_POKEUSER, pid, | |
3896 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3897 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3898 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
3899 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
3900 | if (errno != 0) | |
3901 | { | |
3902 | /* At this point, ESRCH should mean the process is | |
3903 | already gone, in which case we simply ignore attempts | |
3904 | to change its registers. See also the related | |
3905 | comment in linux_resume_one_lwp. */ | |
3906 | if (errno == ESRCH) | |
3907 | return; | |
3908 | ||
3909 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
3910 | error ("writing register %d: %s", regno, strerror (errno)); | |
3911 | } | |
3912 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
3913 | } | |
3914 | } | |
3915 | ||
da6d8c04 | 3916 | /* Fetch all registers, or just one, from the child process. */ |
58caa3dc | 3917 | static void |
442ea881 | 3918 | usr_fetch_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 3919 | { |
4463ce24 | 3920 | if (regno == -1) |
2ec06d2e | 3921 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 3922 | fetch_register (regcache, regno); |
da6d8c04 | 3923 | else |
442ea881 | 3924 | fetch_register (regcache, regno); |
da6d8c04 DJ |
3925 | } |
3926 | ||
3927 | /* Store our register values back into the inferior. | |
3928 | If REGNO is -1, do this for all registers. | |
3929 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc | 3930 | static void |
442ea881 | 3931 | usr_store_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 3932 | { |
7325beb4 | 3933 | if (regno == -1) |
2ec06d2e | 3934 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
7325beb4 MR |
3935 | store_register (regcache, regno); |
3936 | else | |
3937 | store_register (regcache, regno); | |
da6d8c04 | 3938 | } |
58caa3dc DJ |
3939 | #endif /* HAVE_LINUX_USRREGS */ |
3940 | ||
3941 | ||
3942 | ||
3943 | #ifdef HAVE_LINUX_REGSETS | |
3944 | ||
3945 | static int | |
442ea881 | 3946 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3947 | { |
3948 | struct regset_info *regset; | |
e9d25b98 | 3949 | int saw_general_regs = 0; |
95954743 | 3950 | int pid; |
1570b33e | 3951 | struct iovec iov; |
58caa3dc DJ |
3952 | |
3953 | regset = target_regsets; | |
3954 | ||
95954743 | 3955 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3956 | while (regset->size >= 0) |
3957 | { | |
1570b33e L |
3958 | void *buf, *data; |
3959 | int nt_type, res; | |
58caa3dc | 3960 | |
52fa2412 | 3961 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3962 | { |
3963 | regset ++; | |
3964 | continue; | |
3965 | } | |
3966 | ||
bca929d3 | 3967 | buf = xmalloc (regset->size); |
1570b33e L |
3968 | |
3969 | nt_type = regset->nt_type; | |
3970 | if (nt_type) | |
3971 | { | |
3972 | iov.iov_base = buf; | |
3973 | iov.iov_len = regset->size; | |
3974 | data = (void *) &iov; | |
3975 | } | |
3976 | else | |
3977 | data = buf; | |
3978 | ||
dfb64f85 | 3979 | #ifndef __sparc__ |
1570b33e | 3980 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3981 | #else |
1570b33e | 3982 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 3983 | #endif |
58caa3dc DJ |
3984 | if (res < 0) |
3985 | { | |
3986 | if (errno == EIO) | |
3987 | { | |
52fa2412 UW |
3988 | /* If we get EIO on a regset, do not try it again for |
3989 | this process. */ | |
3990 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3991 | free (buf); |
52fa2412 | 3992 | continue; |
58caa3dc DJ |
3993 | } |
3994 | else | |
3995 | { | |
0d62e5e8 | 3996 | char s[256]; |
95954743 PA |
3997 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
3998 | pid); | |
0d62e5e8 | 3999 | perror (s); |
58caa3dc DJ |
4000 | } |
4001 | } | |
e9d25b98 DJ |
4002 | else if (regset->type == GENERAL_REGS) |
4003 | saw_general_regs = 1; | |
442ea881 | 4004 | regset->store_function (regcache, buf); |
58caa3dc | 4005 | regset ++; |
fdeb2a12 | 4006 | free (buf); |
58caa3dc | 4007 | } |
e9d25b98 DJ |
4008 | if (saw_general_regs) |
4009 | return 0; | |
4010 | else | |
4011 | return 1; | |
58caa3dc DJ |
4012 | } |
4013 | ||
4014 | static int | |
442ea881 | 4015 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
4016 | { |
4017 | struct regset_info *regset; | |
e9d25b98 | 4018 | int saw_general_regs = 0; |
95954743 | 4019 | int pid; |
1570b33e | 4020 | struct iovec iov; |
58caa3dc DJ |
4021 | |
4022 | regset = target_regsets; | |
4023 | ||
95954743 | 4024 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4025 | while (regset->size >= 0) |
4026 | { | |
1570b33e L |
4027 | void *buf, *data; |
4028 | int nt_type, res; | |
58caa3dc | 4029 | |
52fa2412 | 4030 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
4031 | { |
4032 | regset ++; | |
4033 | continue; | |
4034 | } | |
4035 | ||
bca929d3 | 4036 | buf = xmalloc (regset->size); |
545587ee DJ |
4037 | |
4038 | /* First fill the buffer with the current register set contents, | |
4039 | in case there are any items in the kernel's regset that are | |
4040 | not in gdbserver's regcache. */ | |
1570b33e L |
4041 | |
4042 | nt_type = regset->nt_type; | |
4043 | if (nt_type) | |
4044 | { | |
4045 | iov.iov_base = buf; | |
4046 | iov.iov_len = regset->size; | |
4047 | data = (void *) &iov; | |
4048 | } | |
4049 | else | |
4050 | data = buf; | |
4051 | ||
dfb64f85 | 4052 | #ifndef __sparc__ |
1570b33e | 4053 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 4054 | #else |
1570b33e | 4055 | res = ptrace (regset->get_request, pid, &iov, data); |
dfb64f85 | 4056 | #endif |
545587ee DJ |
4057 | |
4058 | if (res == 0) | |
4059 | { | |
4060 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4061 | regset->fill_function (regcache, buf); |
545587ee DJ |
4062 | |
4063 | /* Only now do we write the register set. */ | |
dfb64f85 | 4064 | #ifndef __sparc__ |
1570b33e | 4065 | res = ptrace (regset->set_request, pid, nt_type, data); |
dfb64f85 | 4066 | #else |
1570b33e | 4067 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4068 | #endif |
545587ee DJ |
4069 | } |
4070 | ||
58caa3dc DJ |
4071 | if (res < 0) |
4072 | { | |
4073 | if (errno == EIO) | |
4074 | { | |
52fa2412 UW |
4075 | /* If we get EIO on a regset, do not try it again for |
4076 | this process. */ | |
4077 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 4078 | free (buf); |
52fa2412 | 4079 | continue; |
58caa3dc | 4080 | } |
3221518c UW |
4081 | else if (errno == ESRCH) |
4082 | { | |
1b3f6016 PA |
4083 | /* At this point, ESRCH should mean the process is |
4084 | already gone, in which case we simply ignore attempts | |
4085 | to change its registers. See also the related | |
4086 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4087 | free (buf); |
3221518c UW |
4088 | return 0; |
4089 | } | |
58caa3dc DJ |
4090 | else |
4091 | { | |
ce3a066d | 4092 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4093 | } |
4094 | } | |
e9d25b98 DJ |
4095 | else if (regset->type == GENERAL_REGS) |
4096 | saw_general_regs = 1; | |
58caa3dc | 4097 | regset ++; |
09ec9b38 | 4098 | free (buf); |
58caa3dc | 4099 | } |
e9d25b98 DJ |
4100 | if (saw_general_regs) |
4101 | return 0; | |
4102 | else | |
4103 | return 1; | |
ce3a066d | 4104 | return 0; |
58caa3dc DJ |
4105 | } |
4106 | ||
4107 | #endif /* HAVE_LINUX_REGSETS */ | |
4108 | ||
4109 | ||
4110 | void | |
442ea881 | 4111 | linux_fetch_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
4112 | { |
4113 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 4114 | if (regsets_fetch_inferior_registers (regcache) == 0) |
52fa2412 | 4115 | return; |
58caa3dc DJ |
4116 | #endif |
4117 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 4118 | usr_fetch_inferior_registers (regcache, regno); |
58caa3dc DJ |
4119 | #endif |
4120 | } | |
4121 | ||
4122 | void | |
442ea881 | 4123 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
4124 | { |
4125 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 4126 | if (regsets_store_inferior_registers (regcache) == 0) |
52fa2412 | 4127 | return; |
58caa3dc DJ |
4128 | #endif |
4129 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 4130 | usr_store_inferior_registers (regcache, regno); |
58caa3dc DJ |
4131 | #endif |
4132 | } | |
4133 | ||
da6d8c04 | 4134 | |
da6d8c04 DJ |
4135 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4136 | to debugger memory starting at MYADDR. */ | |
4137 | ||
c3e735a6 | 4138 | static int |
f450004a | 4139 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
4140 | { |
4141 | register int i; | |
4142 | /* Round starting address down to longword boundary. */ | |
4143 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4144 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
4145 | register int count |
4146 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
4147 | / sizeof (PTRACE_XFER_TYPE); |
4148 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 4149 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 4150 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
4151 | int fd; |
4152 | char filename[64]; | |
95954743 | 4153 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
4154 | |
4155 | /* Try using /proc. Don't bother for one word. */ | |
4156 | if (len >= 3 * sizeof (long)) | |
4157 | { | |
4158 | /* We could keep this file open and cache it - possibly one per | |
4159 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4160 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4161 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4162 | if (fd == -1) | |
4163 | goto no_proc; | |
4164 | ||
4165 | /* If pread64 is available, use it. It's faster if the kernel | |
4166 | supports it (only one syscall), and it's 64-bit safe even on | |
4167 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4168 | application). */ | |
4169 | #ifdef HAVE_PREAD64 | |
4170 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
4171 | #else | |
1de1badb | 4172 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
4173 | #endif |
4174 | { | |
4175 | close (fd); | |
4176 | goto no_proc; | |
4177 | } | |
4178 | ||
4179 | close (fd); | |
4180 | return 0; | |
4181 | } | |
da6d8c04 | 4182 | |
fd462a61 | 4183 | no_proc: |
da6d8c04 DJ |
4184 | /* Read all the longwords */ |
4185 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4186 | { | |
c3e735a6 | 4187 | errno = 0; |
14ce3065 DE |
4188 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4189 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4190 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
4191 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
4192 | if (errno) |
4193 | return errno; | |
da6d8c04 DJ |
4194 | } |
4195 | ||
4196 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
4197 | memcpy (myaddr, |
4198 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4199 | len); | |
c3e735a6 DJ |
4200 | |
4201 | return 0; | |
da6d8c04 DJ |
4202 | } |
4203 | ||
93ae6fdc PA |
4204 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4205 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
4206 | returns the value of errno. */ |
4207 | ||
ce3a066d | 4208 | static int |
f450004a | 4209 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4210 | { |
4211 | register int i; | |
4212 | /* Round starting address down to longword boundary. */ | |
4213 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4214 | /* Round ending address up; get number of longwords that makes. */ | |
4215 | register int count | |
493e2a69 MS |
4216 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4217 | / sizeof (PTRACE_XFER_TYPE); | |
4218 | ||
da6d8c04 | 4219 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4220 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4221 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4222 | ||
95954743 | 4223 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4224 | |
0d62e5e8 DJ |
4225 | if (debug_threads) |
4226 | { | |
58d6951d DJ |
4227 | /* Dump up to four bytes. */ |
4228 | unsigned int val = * (unsigned int *) myaddr; | |
4229 | if (len == 1) | |
4230 | val = val & 0xff; | |
4231 | else if (len == 2) | |
4232 | val = val & 0xffff; | |
4233 | else if (len == 3) | |
4234 | val = val & 0xffffff; | |
4235 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4236 | val, (long)memaddr); | |
0d62e5e8 DJ |
4237 | } |
4238 | ||
da6d8c04 DJ |
4239 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4240 | ||
93ae6fdc | 4241 | errno = 0; |
14ce3065 DE |
4242 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4243 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4244 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
4245 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
4246 | if (errno) |
4247 | return errno; | |
da6d8c04 DJ |
4248 | |
4249 | if (count > 1) | |
4250 | { | |
93ae6fdc | 4251 | errno = 0; |
da6d8c04 | 4252 | buffer[count - 1] |
95954743 | 4253 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4254 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4255 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4256 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4257 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 4258 | 0); |
93ae6fdc PA |
4259 | if (errno) |
4260 | return errno; | |
da6d8c04 DJ |
4261 | } |
4262 | ||
93ae6fdc | 4263 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4264 | |
493e2a69 MS |
4265 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4266 | myaddr, len); | |
da6d8c04 DJ |
4267 | |
4268 | /* Write the entire buffer. */ | |
4269 | ||
4270 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4271 | { | |
4272 | errno = 0; | |
14ce3065 DE |
4273 | ptrace (PTRACE_POKETEXT, pid, |
4274 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4275 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4276 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4277 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4278 | if (errno) |
4279 | return errno; | |
4280 | } | |
4281 | ||
4282 | return 0; | |
4283 | } | |
2f2893d9 | 4284 | |
6076632b | 4285 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4286 | static int linux_supports_tracefork_flag; |
4287 | ||
1e7fc18c PA |
4288 | static void |
4289 | linux_enable_event_reporting (int pid) | |
4290 | { | |
4291 | if (!linux_supports_tracefork_flag) | |
4292 | return; | |
4293 | ||
4294 | ptrace (PTRACE_SETOPTIONS, pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
4295 | } | |
4296 | ||
51c2684e | 4297 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4298 | |
51c2684e DJ |
4299 | static int |
4300 | linux_tracefork_grandchild (void *arg) | |
4301 | { | |
4302 | _exit (0); | |
4303 | } | |
4304 | ||
7407e2de AS |
4305 | #define STACK_SIZE 4096 |
4306 | ||
51c2684e DJ |
4307 | static int |
4308 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
4309 | { |
4310 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
4311 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
4312 | |
4313 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4314 | ||
4315 | if (fork () == 0) | |
4316 | linux_tracefork_grandchild (NULL); | |
4317 | ||
4318 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4319 | ||
7407e2de AS |
4320 | #ifdef __ia64__ |
4321 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4322 | CLONE_VM | SIGCHLD, NULL); | |
4323 | #else | |
a1f2ce7d | 4324 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4325 | CLONE_VM | SIGCHLD, NULL); |
4326 | #endif | |
e4b7f41c JK |
4327 | |
4328 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4329 | ||
24a09b5f DJ |
4330 | _exit (0); |
4331 | } | |
4332 | ||
24a09b5f DJ |
4333 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4334 | sure that we can enable the option, and that it had the desired | |
4335 | effect. */ | |
4336 | ||
4337 | static void | |
4338 | linux_test_for_tracefork (void) | |
4339 | { | |
4340 | int child_pid, ret, status; | |
4341 | long second_pid; | |
e4b7f41c | 4342 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4343 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4344 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4345 | |
4346 | linux_supports_tracefork_flag = 0; | |
4347 | ||
e4b7f41c JK |
4348 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4349 | ||
4350 | child_pid = fork (); | |
4351 | if (child_pid == 0) | |
4352 | linux_tracefork_child (NULL); | |
4353 | ||
4354 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4355 | ||
51c2684e | 4356 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4357 | #ifdef __ia64__ |
4358 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4359 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4360 | #else /* !__ia64__ */ |
7407e2de AS |
4361 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4362 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4363 | #endif /* !__ia64__ */ |
4364 | ||
4365 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4366 | ||
24a09b5f | 4367 | if (child_pid == -1) |
51c2684e | 4368 | perror_with_name ("clone"); |
24a09b5f DJ |
4369 | |
4370 | ret = my_waitpid (child_pid, &status, 0); | |
4371 | if (ret == -1) | |
4372 | perror_with_name ("waitpid"); | |
4373 | else if (ret != child_pid) | |
4374 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4375 | if (! WIFSTOPPED (status)) | |
4376 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4377 | ||
14ce3065 DE |
4378 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
4379 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
4380 | if (ret != 0) |
4381 | { | |
4382 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4383 | if (ret != 0) | |
4384 | { | |
4385 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4386 | return; | |
4387 | } | |
4388 | ||
4389 | ret = my_waitpid (child_pid, &status, 0); | |
4390 | if (ret != child_pid) | |
4391 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4392 | else if (!WIFSIGNALED (status)) | |
4393 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4394 | "killed child", status); | |
4395 | ||
4396 | return; | |
4397 | } | |
4398 | ||
4399 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
4400 | if (ret != 0) | |
4401 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4402 | ||
4403 | ret = my_waitpid (child_pid, &status, 0); | |
4404 | ||
4405 | if (ret == child_pid && WIFSTOPPED (status) | |
4406 | && status >> 16 == PTRACE_EVENT_FORK) | |
4407 | { | |
4408 | second_pid = 0; | |
4409 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
4410 | if (ret == 0 && second_pid != 0) | |
4411 | { | |
4412 | int second_status; | |
4413 | ||
4414 | linux_supports_tracefork_flag = 1; | |
4415 | my_waitpid (second_pid, &second_status, 0); | |
4416 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
4417 | if (ret != 0) | |
4418 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4419 | my_waitpid (second_pid, &status, 0); | |
4420 | } | |
4421 | } | |
4422 | else | |
4423 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4424 | "(%d, status 0x%x)", ret, status); | |
4425 | ||
4426 | do | |
4427 | { | |
4428 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4429 | if (ret != 0) | |
4430 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4431 | my_waitpid (child_pid, &status, 0); | |
4432 | } | |
4433 | while (WIFSTOPPED (status)); | |
51c2684e | 4434 | |
e4b7f41c | 4435 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4436 | free (stack); |
e4b7f41c | 4437 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4438 | } |
4439 | ||
4440 | ||
2f2893d9 DJ |
4441 | static void |
4442 | linux_look_up_symbols (void) | |
4443 | { | |
0d62e5e8 | 4444 | #ifdef USE_THREAD_DB |
95954743 PA |
4445 | struct process_info *proc = current_process (); |
4446 | ||
cdbfd419 | 4447 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4448 | return; |
4449 | ||
6076632b DE |
4450 | /* If the kernel supports tracing forks then it also supports tracing |
4451 | clones, and then we don't need to use the magic thread event breakpoint | |
4452 | to learn about threads. */ | |
cdbfd419 | 4453 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4454 | #endif |
4455 | } | |
4456 | ||
e5379b03 | 4457 | static void |
ef57601b | 4458 | linux_request_interrupt (void) |
e5379b03 | 4459 | { |
a1928bad | 4460 | extern unsigned long signal_pid; |
e5379b03 | 4461 | |
95954743 PA |
4462 | if (!ptid_equal (cont_thread, null_ptid) |
4463 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4464 | { |
54a0b537 | 4465 | struct lwp_info *lwp; |
bd99dc85 | 4466 | int lwpid; |
e5379b03 | 4467 | |
54a0b537 | 4468 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4469 | lwpid = lwpid_of (lwp); |
4470 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4471 | } |
4472 | else | |
ef57601b | 4473 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4474 | } |
4475 | ||
aa691b87 RM |
4476 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4477 | to debugger memory starting at MYADDR. */ | |
4478 | ||
4479 | static int | |
f450004a | 4480 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4481 | { |
4482 | char filename[PATH_MAX]; | |
4483 | int fd, n; | |
95954743 | 4484 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4485 | |
6cebaf6e | 4486 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4487 | |
4488 | fd = open (filename, O_RDONLY); | |
4489 | if (fd < 0) | |
4490 | return -1; | |
4491 | ||
4492 | if (offset != (CORE_ADDR) 0 | |
4493 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4494 | n = -1; | |
4495 | else | |
4496 | n = read (fd, myaddr, len); | |
4497 | ||
4498 | close (fd); | |
4499 | ||
4500 | return n; | |
4501 | } | |
4502 | ||
d993e290 PA |
4503 | /* These breakpoint and watchpoint related wrapper functions simply |
4504 | pass on the function call if the target has registered a | |
4505 | corresponding function. */ | |
e013ee27 OF |
4506 | |
4507 | static int | |
d993e290 | 4508 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4509 | { |
d993e290 PA |
4510 | if (the_low_target.insert_point != NULL) |
4511 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4512 | else |
4513 | /* Unsupported (see target.h). */ | |
4514 | return 1; | |
4515 | } | |
4516 | ||
4517 | static int | |
d993e290 | 4518 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4519 | { |
d993e290 PA |
4520 | if (the_low_target.remove_point != NULL) |
4521 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4522 | else |
4523 | /* Unsupported (see target.h). */ | |
4524 | return 1; | |
4525 | } | |
4526 | ||
4527 | static int | |
4528 | linux_stopped_by_watchpoint (void) | |
4529 | { | |
c3adc08c PA |
4530 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4531 | ||
4532 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4533 | } |
4534 | ||
4535 | static CORE_ADDR | |
4536 | linux_stopped_data_address (void) | |
4537 | { | |
c3adc08c PA |
4538 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4539 | ||
4540 | return lwp->stopped_data_address; | |
e013ee27 OF |
4541 | } |
4542 | ||
42c81e2a | 4543 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
4544 | #if defined(__mcoldfire__) |
4545 | /* These should really be defined in the kernel's ptrace.h header. */ | |
4546 | #define PT_TEXT_ADDR 49*4 | |
4547 | #define PT_DATA_ADDR 50*4 | |
4548 | #define PT_TEXT_END_ADDR 51*4 | |
eb826dc6 MF |
4549 | #elif defined(BFIN) |
4550 | #define PT_TEXT_ADDR 220 | |
4551 | #define PT_TEXT_END_ADDR 224 | |
4552 | #define PT_DATA_ADDR 228 | |
58dbd541 YQ |
4553 | #elif defined(__TMS320C6X__) |
4554 | #define PT_TEXT_ADDR (0x10000*4) | |
4555 | #define PT_DATA_ADDR (0x10004*4) | |
4556 | #define PT_TEXT_END_ADDR (0x10008*4) | |
52fb6437 NS |
4557 | #endif |
4558 | ||
4559 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4560 | to tell gdb about. */ | |
4561 | ||
4562 | static int | |
4563 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4564 | { | |
4565 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
4566 | unsigned long text, text_end, data; | |
bd99dc85 | 4567 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4568 | |
4569 | errno = 0; | |
4570 | ||
4571 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
4572 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
4573 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
4574 | ||
4575 | if (errno == 0) | |
4576 | { | |
4577 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4578 | used by gdb) are relative to the beginning of the program, |
4579 | with the data segment immediately following the text segment. | |
4580 | However, the actual runtime layout in memory may put the data | |
4581 | somewhere else, so when we send gdb a data base-address, we | |
4582 | use the real data base address and subtract the compile-time | |
4583 | data base-address from it (which is just the length of the | |
4584 | text segment). BSS immediately follows data in both | |
4585 | cases. */ | |
52fb6437 NS |
4586 | *text_p = text; |
4587 | *data_p = data - (text_end - text); | |
1b3f6016 | 4588 | |
52fb6437 NS |
4589 | return 1; |
4590 | } | |
4591 | #endif | |
4592 | return 0; | |
4593 | } | |
4594 | #endif | |
4595 | ||
07e059b5 VP |
4596 | static int |
4597 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4598 | unsigned char *readbuf, unsigned const char *writebuf, |
4599 | CORE_ADDR offset, int len) | |
07e059b5 | 4600 | { |
d26e3629 | 4601 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4602 | } |
4603 | ||
d0722149 DE |
4604 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4605 | layout of the inferiors' architecture. */ | |
4606 | ||
4607 | static void | |
4608 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
4609 | { | |
4610 | int done = 0; | |
4611 | ||
4612 | if (the_low_target.siginfo_fixup != NULL) | |
4613 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4614 | ||
4615 | /* If there was no callback, or the callback didn't do anything, | |
4616 | then just do a straight memcpy. */ | |
4617 | if (!done) | |
4618 | { | |
4619 | if (direction == 1) | |
4620 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4621 | else | |
4622 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4623 | } | |
4624 | } | |
4625 | ||
4aa995e1 PA |
4626 | static int |
4627 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4628 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4629 | { | |
d0722149 | 4630 | int pid; |
4aa995e1 | 4631 | struct siginfo siginfo; |
d0722149 | 4632 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4633 | |
4634 | if (current_inferior == NULL) | |
4635 | return -1; | |
4636 | ||
bd99dc85 | 4637 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4638 | |
4639 | if (debug_threads) | |
d0722149 | 4640 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4641 | readbuf != NULL ? "Reading" : "Writing", |
4642 | pid); | |
4643 | ||
0adea5f7 | 4644 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4645 | return -1; |
4646 | ||
4647 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
4648 | return -1; | |
4649 | ||
d0722149 DE |
4650 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4651 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4652 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4653 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4654 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4655 | ||
4aa995e1 PA |
4656 | if (offset + len > sizeof (siginfo)) |
4657 | len = sizeof (siginfo) - offset; | |
4658 | ||
4659 | if (readbuf != NULL) | |
d0722149 | 4660 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4661 | else |
4662 | { | |
d0722149 DE |
4663 | memcpy (inf_siginfo + offset, writebuf, len); |
4664 | ||
4665 | /* Convert back to ptrace layout before flushing it out. */ | |
4666 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4667 | ||
4aa995e1 PA |
4668 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
4669 | return -1; | |
4670 | } | |
4671 | ||
4672 | return len; | |
4673 | } | |
4674 | ||
bd99dc85 PA |
4675 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4676 | so we notice when children change state; as the handler for the | |
4677 | sigsuspend in my_waitpid. */ | |
4678 | ||
4679 | static void | |
4680 | sigchld_handler (int signo) | |
4681 | { | |
4682 | int old_errno = errno; | |
4683 | ||
4684 | if (debug_threads) | |
e581f2b4 PA |
4685 | { |
4686 | do | |
4687 | { | |
4688 | /* fprintf is not async-signal-safe, so call write | |
4689 | directly. */ | |
4690 | if (write (2, "sigchld_handler\n", | |
4691 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4692 | break; /* just ignore */ | |
4693 | } while (0); | |
4694 | } | |
bd99dc85 PA |
4695 | |
4696 | if (target_is_async_p ()) | |
4697 | async_file_mark (); /* trigger a linux_wait */ | |
4698 | ||
4699 | errno = old_errno; | |
4700 | } | |
4701 | ||
4702 | static int | |
4703 | linux_supports_non_stop (void) | |
4704 | { | |
4705 | return 1; | |
4706 | } | |
4707 | ||
4708 | static int | |
4709 | linux_async (int enable) | |
4710 | { | |
4711 | int previous = (linux_event_pipe[0] != -1); | |
4712 | ||
8336d594 PA |
4713 | if (debug_threads) |
4714 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4715 | enable, previous); | |
4716 | ||
bd99dc85 PA |
4717 | if (previous != enable) |
4718 | { | |
4719 | sigset_t mask; | |
4720 | sigemptyset (&mask); | |
4721 | sigaddset (&mask, SIGCHLD); | |
4722 | ||
4723 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4724 | ||
4725 | if (enable) | |
4726 | { | |
4727 | if (pipe (linux_event_pipe) == -1) | |
4728 | fatal ("creating event pipe failed."); | |
4729 | ||
4730 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4731 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4732 | ||
4733 | /* Register the event loop handler. */ | |
4734 | add_file_handler (linux_event_pipe[0], | |
4735 | handle_target_event, NULL); | |
4736 | ||
4737 | /* Always trigger a linux_wait. */ | |
4738 | async_file_mark (); | |
4739 | } | |
4740 | else | |
4741 | { | |
4742 | delete_file_handler (linux_event_pipe[0]); | |
4743 | ||
4744 | close (linux_event_pipe[0]); | |
4745 | close (linux_event_pipe[1]); | |
4746 | linux_event_pipe[0] = -1; | |
4747 | linux_event_pipe[1] = -1; | |
4748 | } | |
4749 | ||
4750 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4751 | } | |
4752 | ||
4753 | return previous; | |
4754 | } | |
4755 | ||
4756 | static int | |
4757 | linux_start_non_stop (int nonstop) | |
4758 | { | |
4759 | /* Register or unregister from event-loop accordingly. */ | |
4760 | linux_async (nonstop); | |
4761 | return 0; | |
4762 | } | |
4763 | ||
cf8fd78b PA |
4764 | static int |
4765 | linux_supports_multi_process (void) | |
4766 | { | |
4767 | return 1; | |
4768 | } | |
4769 | ||
03583c20 UW |
4770 | static int |
4771 | linux_supports_disable_randomization (void) | |
4772 | { | |
4773 | #ifdef HAVE_PERSONALITY | |
4774 | return 1; | |
4775 | #else | |
4776 | return 0; | |
4777 | #endif | |
4778 | } | |
efcbbd14 UW |
4779 | |
4780 | /* Enumerate spufs IDs for process PID. */ | |
4781 | static int | |
4782 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
4783 | { | |
4784 | int pos = 0; | |
4785 | int written = 0; | |
4786 | char path[128]; | |
4787 | DIR *dir; | |
4788 | struct dirent *entry; | |
4789 | ||
4790 | sprintf (path, "/proc/%ld/fd", pid); | |
4791 | dir = opendir (path); | |
4792 | if (!dir) | |
4793 | return -1; | |
4794 | ||
4795 | rewinddir (dir); | |
4796 | while ((entry = readdir (dir)) != NULL) | |
4797 | { | |
4798 | struct stat st; | |
4799 | struct statfs stfs; | |
4800 | int fd; | |
4801 | ||
4802 | fd = atoi (entry->d_name); | |
4803 | if (!fd) | |
4804 | continue; | |
4805 | ||
4806 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4807 | if (stat (path, &st) != 0) | |
4808 | continue; | |
4809 | if (!S_ISDIR (st.st_mode)) | |
4810 | continue; | |
4811 | ||
4812 | if (statfs (path, &stfs) != 0) | |
4813 | continue; | |
4814 | if (stfs.f_type != SPUFS_MAGIC) | |
4815 | continue; | |
4816 | ||
4817 | if (pos >= offset && pos + 4 <= offset + len) | |
4818 | { | |
4819 | *(unsigned int *)(buf + pos - offset) = fd; | |
4820 | written += 4; | |
4821 | } | |
4822 | pos += 4; | |
4823 | } | |
4824 | ||
4825 | closedir (dir); | |
4826 | return written; | |
4827 | } | |
4828 | ||
4829 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4830 | object type, using the /proc file system. */ | |
4831 | static int | |
4832 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4833 | unsigned const char *writebuf, | |
4834 | CORE_ADDR offset, int len) | |
4835 | { | |
4836 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4837 | char buf[128]; | |
4838 | int fd = 0; | |
4839 | int ret = 0; | |
4840 | ||
4841 | if (!writebuf && !readbuf) | |
4842 | return -1; | |
4843 | ||
4844 | if (!*annex) | |
4845 | { | |
4846 | if (!readbuf) | |
4847 | return -1; | |
4848 | else | |
4849 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4850 | } | |
4851 | ||
4852 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
4853 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4854 | if (fd <= 0) | |
4855 | return -1; | |
4856 | ||
4857 | if (offset != 0 | |
4858 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4859 | { | |
4860 | close (fd); | |
4861 | return 0; | |
4862 | } | |
4863 | ||
4864 | if (writebuf) | |
4865 | ret = write (fd, writebuf, (size_t) len); | |
4866 | else | |
4867 | ret = read (fd, readbuf, (size_t) len); | |
4868 | ||
4869 | close (fd); | |
4870 | return ret; | |
4871 | } | |
4872 | ||
723b724b | 4873 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
4874 | struct target_loadseg |
4875 | { | |
4876 | /* Core address to which the segment is mapped. */ | |
4877 | Elf32_Addr addr; | |
4878 | /* VMA recorded in the program header. */ | |
4879 | Elf32_Addr p_vaddr; | |
4880 | /* Size of this segment in memory. */ | |
4881 | Elf32_Word p_memsz; | |
4882 | }; | |
4883 | ||
723b724b | 4884 | # if defined PT_GETDSBT |
78d85199 YQ |
4885 | struct target_loadmap |
4886 | { | |
4887 | /* Protocol version number, must be zero. */ | |
4888 | Elf32_Word version; | |
4889 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
4890 | unsigned *dsbt_table; | |
4891 | unsigned dsbt_size, dsbt_index; | |
4892 | /* Number of segments in this map. */ | |
4893 | Elf32_Word nsegs; | |
4894 | /* The actual memory map. */ | |
4895 | struct target_loadseg segs[/*nsegs*/]; | |
4896 | }; | |
723b724b MF |
4897 | # define LINUX_LOADMAP PT_GETDSBT |
4898 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
4899 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
4900 | # else | |
4901 | struct target_loadmap | |
4902 | { | |
4903 | /* Protocol version number, must be zero. */ | |
4904 | Elf32_Half version; | |
4905 | /* Number of segments in this map. */ | |
4906 | Elf32_Half nsegs; | |
4907 | /* The actual memory map. */ | |
4908 | struct target_loadseg segs[/*nsegs*/]; | |
4909 | }; | |
4910 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
4911 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
4912 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
4913 | # endif | |
78d85199 | 4914 | |
78d85199 YQ |
4915 | static int |
4916 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
4917 | unsigned char *myaddr, unsigned int len) | |
4918 | { | |
4919 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4920 | int addr = -1; | |
4921 | struct target_loadmap *data = NULL; | |
4922 | unsigned int actual_length, copy_length; | |
4923 | ||
4924 | if (strcmp (annex, "exec") == 0) | |
723b724b | 4925 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 4926 | else if (strcmp (annex, "interp") == 0) |
723b724b | 4927 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
4928 | else |
4929 | return -1; | |
4930 | ||
723b724b | 4931 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
4932 | return -1; |
4933 | ||
4934 | if (data == NULL) | |
4935 | return -1; | |
4936 | ||
4937 | actual_length = sizeof (struct target_loadmap) | |
4938 | + sizeof (struct target_loadseg) * data->nsegs; | |
4939 | ||
4940 | if (offset < 0 || offset > actual_length) | |
4941 | return -1; | |
4942 | ||
4943 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
4944 | memcpy (myaddr, (char *) data + offset, copy_length); | |
4945 | return copy_length; | |
4946 | } | |
723b724b MF |
4947 | #else |
4948 | # define linux_read_loadmap NULL | |
4949 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 4950 | |
1570b33e L |
4951 | static void |
4952 | linux_process_qsupported (const char *query) | |
4953 | { | |
4954 | if (the_low_target.process_qsupported != NULL) | |
4955 | the_low_target.process_qsupported (query); | |
4956 | } | |
4957 | ||
219f2f23 PA |
4958 | static int |
4959 | linux_supports_tracepoints (void) | |
4960 | { | |
4961 | if (*the_low_target.supports_tracepoints == NULL) | |
4962 | return 0; | |
4963 | ||
4964 | return (*the_low_target.supports_tracepoints) (); | |
4965 | } | |
4966 | ||
4967 | static CORE_ADDR | |
4968 | linux_read_pc (struct regcache *regcache) | |
4969 | { | |
4970 | if (the_low_target.get_pc == NULL) | |
4971 | return 0; | |
4972 | ||
4973 | return (*the_low_target.get_pc) (regcache); | |
4974 | } | |
4975 | ||
4976 | static void | |
4977 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
4978 | { | |
4979 | gdb_assert (the_low_target.set_pc != NULL); | |
4980 | ||
4981 | (*the_low_target.set_pc) (regcache, pc); | |
4982 | } | |
4983 | ||
8336d594 PA |
4984 | static int |
4985 | linux_thread_stopped (struct thread_info *thread) | |
4986 | { | |
4987 | return get_thread_lwp (thread)->stopped; | |
4988 | } | |
4989 | ||
4990 | /* This exposes stop-all-threads functionality to other modules. */ | |
4991 | ||
4992 | static void | |
7984d532 | 4993 | linux_pause_all (int freeze) |
8336d594 | 4994 | { |
7984d532 PA |
4995 | stop_all_lwps (freeze, NULL); |
4996 | } | |
4997 | ||
4998 | /* This exposes unstop-all-threads functionality to other gdbserver | |
4999 | modules. */ | |
5000 | ||
5001 | static void | |
5002 | linux_unpause_all (int unfreeze) | |
5003 | { | |
5004 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5005 | } |
5006 | ||
90d74c30 PA |
5007 | static int |
5008 | linux_prepare_to_access_memory (void) | |
5009 | { | |
5010 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5011 | running LWP. */ | |
5012 | if (non_stop) | |
5013 | linux_pause_all (1); | |
5014 | return 0; | |
5015 | } | |
5016 | ||
5017 | static void | |
0146f85b | 5018 | linux_done_accessing_memory (void) |
90d74c30 PA |
5019 | { |
5020 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5021 | running LWP. */ | |
5022 | if (non_stop) | |
5023 | linux_unpause_all (1); | |
5024 | } | |
5025 | ||
fa593d66 PA |
5026 | static int |
5027 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5028 | CORE_ADDR collector, | |
5029 | CORE_ADDR lockaddr, | |
5030 | ULONGEST orig_size, | |
5031 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5032 | CORE_ADDR *trampoline, |
5033 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5034 | unsigned char *jjump_pad_insn, |
5035 | ULONGEST *jjump_pad_insn_size, | |
5036 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5037 | CORE_ADDR *adjusted_insn_addr_end, |
5038 | char *err) | |
fa593d66 PA |
5039 | { |
5040 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5041 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5042 | jump_entry, trampoline, trampoline_size, |
5043 | jjump_pad_insn, jjump_pad_insn_size, | |
5044 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5045 | err); | |
fa593d66 PA |
5046 | } |
5047 | ||
6a271cae PA |
5048 | static struct emit_ops * |
5049 | linux_emit_ops (void) | |
5050 | { | |
5051 | if (the_low_target.emit_ops != NULL) | |
5052 | return (*the_low_target.emit_ops) (); | |
5053 | else | |
5054 | return NULL; | |
5055 | } | |
5056 | ||
405f8e94 SS |
5057 | static int |
5058 | linux_get_min_fast_tracepoint_insn_len (void) | |
5059 | { | |
5060 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5061 | } | |
5062 | ||
2268b414 JK |
5063 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5064 | ||
5065 | static int | |
5066 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5067 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5068 | { | |
5069 | char filename[PATH_MAX]; | |
5070 | int fd; | |
5071 | const int auxv_size = is_elf64 | |
5072 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5073 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5074 | ||
5075 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5076 | ||
5077 | fd = open (filename, O_RDONLY); | |
5078 | if (fd < 0) | |
5079 | return 1; | |
5080 | ||
5081 | *phdr_memaddr = 0; | |
5082 | *num_phdr = 0; | |
5083 | while (read (fd, buf, auxv_size) == auxv_size | |
5084 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5085 | { | |
5086 | if (is_elf64) | |
5087 | { | |
5088 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5089 | ||
5090 | switch (aux->a_type) | |
5091 | { | |
5092 | case AT_PHDR: | |
5093 | *phdr_memaddr = aux->a_un.a_val; | |
5094 | break; | |
5095 | case AT_PHNUM: | |
5096 | *num_phdr = aux->a_un.a_val; | |
5097 | break; | |
5098 | } | |
5099 | } | |
5100 | else | |
5101 | { | |
5102 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5103 | ||
5104 | switch (aux->a_type) | |
5105 | { | |
5106 | case AT_PHDR: | |
5107 | *phdr_memaddr = aux->a_un.a_val; | |
5108 | break; | |
5109 | case AT_PHNUM: | |
5110 | *num_phdr = aux->a_un.a_val; | |
5111 | break; | |
5112 | } | |
5113 | } | |
5114 | } | |
5115 | ||
5116 | close (fd); | |
5117 | ||
5118 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5119 | { | |
5120 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5121 | "phdr_memaddr = %ld, phdr_num = %d", | |
5122 | (long) *phdr_memaddr, *num_phdr); | |
5123 | return 2; | |
5124 | } | |
5125 | ||
5126 | return 0; | |
5127 | } | |
5128 | ||
5129 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5130 | ||
5131 | static CORE_ADDR | |
5132 | get_dynamic (const int pid, const int is_elf64) | |
5133 | { | |
5134 | CORE_ADDR phdr_memaddr, relocation; | |
5135 | int num_phdr, i; | |
5136 | unsigned char *phdr_buf; | |
5137 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5138 | ||
5139 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5140 | return 0; | |
5141 | ||
5142 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5143 | phdr_buf = alloca (num_phdr * phdr_size); | |
5144 | ||
5145 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5146 | return 0; | |
5147 | ||
5148 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5149 | non-zero for PIE ones. */ | |
5150 | relocation = -1; | |
5151 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5152 | if (is_elf64) | |
5153 | { | |
5154 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5155 | ||
5156 | if (p->p_type == PT_PHDR) | |
5157 | relocation = phdr_memaddr - p->p_vaddr; | |
5158 | } | |
5159 | else | |
5160 | { | |
5161 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5162 | ||
5163 | if (p->p_type == PT_PHDR) | |
5164 | relocation = phdr_memaddr - p->p_vaddr; | |
5165 | } | |
5166 | ||
5167 | if (relocation == -1) | |
5168 | { | |
5169 | warning ("Unexpected missing PT_PHDR"); | |
5170 | return 0; | |
5171 | } | |
5172 | ||
5173 | for (i = 0; i < num_phdr; i++) | |
5174 | { | |
5175 | if (is_elf64) | |
5176 | { | |
5177 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5178 | ||
5179 | if (p->p_type == PT_DYNAMIC) | |
5180 | return p->p_vaddr + relocation; | |
5181 | } | |
5182 | else | |
5183 | { | |
5184 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5185 | ||
5186 | if (p->p_type == PT_DYNAMIC) | |
5187 | return p->p_vaddr + relocation; | |
5188 | } | |
5189 | } | |
5190 | ||
5191 | return 0; | |
5192 | } | |
5193 | ||
5194 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
5195 | can be 0 if the inferior does not yet have the library list initialized. */ | |
5196 | ||
5197 | static CORE_ADDR | |
5198 | get_r_debug (const int pid, const int is_elf64) | |
5199 | { | |
5200 | CORE_ADDR dynamic_memaddr; | |
5201 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5202 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
5203 | ||
5204 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5205 | if (dynamic_memaddr == 0) | |
5206 | return (CORE_ADDR) -1; | |
5207 | ||
5208 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5209 | { | |
5210 | if (is_elf64) | |
5211 | { | |
5212 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
5213 | ||
5214 | if (dyn->d_tag == DT_DEBUG) | |
5215 | return dyn->d_un.d_val; | |
5216 | ||
5217 | if (dyn->d_tag == DT_NULL) | |
5218 | break; | |
5219 | } | |
5220 | else | |
5221 | { | |
5222 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
5223 | ||
5224 | if (dyn->d_tag == DT_DEBUG) | |
5225 | return dyn->d_un.d_val; | |
5226 | ||
5227 | if (dyn->d_tag == DT_NULL) | |
5228 | break; | |
5229 | } | |
5230 | ||
5231 | dynamic_memaddr += dyn_size; | |
5232 | } | |
5233 | ||
5234 | return (CORE_ADDR) -1; | |
5235 | } | |
5236 | ||
5237 | /* Read one pointer from MEMADDR in the inferior. */ | |
5238 | ||
5239 | static int | |
5240 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5241 | { | |
5242 | *ptr = 0; | |
5243 | return linux_read_memory (memaddr, (unsigned char *) ptr, ptr_size); | |
5244 | } | |
5245 | ||
5246 | struct link_map_offsets | |
5247 | { | |
5248 | /* Offset and size of r_debug.r_version. */ | |
5249 | int r_version_offset; | |
5250 | ||
5251 | /* Offset and size of r_debug.r_map. */ | |
5252 | int r_map_offset; | |
5253 | ||
5254 | /* Offset to l_addr field in struct link_map. */ | |
5255 | int l_addr_offset; | |
5256 | ||
5257 | /* Offset to l_name field in struct link_map. */ | |
5258 | int l_name_offset; | |
5259 | ||
5260 | /* Offset to l_ld field in struct link_map. */ | |
5261 | int l_ld_offset; | |
5262 | ||
5263 | /* Offset to l_next field in struct link_map. */ | |
5264 | int l_next_offset; | |
5265 | ||
5266 | /* Offset to l_prev field in struct link_map. */ | |
5267 | int l_prev_offset; | |
5268 | }; | |
5269 | ||
5270 | /* Construct qXfer:libraries:read reply. */ | |
5271 | ||
5272 | static int | |
5273 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5274 | unsigned const char *writebuf, | |
5275 | CORE_ADDR offset, int len) | |
5276 | { | |
5277 | char *document; | |
5278 | unsigned document_len; | |
5279 | struct process_info_private *const priv = current_process ()->private; | |
5280 | char filename[PATH_MAX]; | |
5281 | int pid, is_elf64; | |
5282 | ||
5283 | static const struct link_map_offsets lmo_32bit_offsets = | |
5284 | { | |
5285 | 0, /* r_version offset. */ | |
5286 | 4, /* r_debug.r_map offset. */ | |
5287 | 0, /* l_addr offset in link_map. */ | |
5288 | 4, /* l_name offset in link_map. */ | |
5289 | 8, /* l_ld offset in link_map. */ | |
5290 | 12, /* l_next offset in link_map. */ | |
5291 | 16 /* l_prev offset in link_map. */ | |
5292 | }; | |
5293 | ||
5294 | static const struct link_map_offsets lmo_64bit_offsets = | |
5295 | { | |
5296 | 0, /* r_version offset. */ | |
5297 | 8, /* r_debug.r_map offset. */ | |
5298 | 0, /* l_addr offset in link_map. */ | |
5299 | 8, /* l_name offset in link_map. */ | |
5300 | 16, /* l_ld offset in link_map. */ | |
5301 | 24, /* l_next offset in link_map. */ | |
5302 | 32 /* l_prev offset in link_map. */ | |
5303 | }; | |
5304 | const struct link_map_offsets *lmo; | |
5305 | ||
5306 | if (writebuf != NULL) | |
5307 | return -2; | |
5308 | if (readbuf == NULL) | |
5309 | return -1; | |
5310 | ||
5311 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5312 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
5313 | is_elf64 = elf_64_file_p (filename); | |
5314 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; | |
5315 | ||
5316 | if (priv->r_debug == 0) | |
5317 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5318 | ||
5319 | if (priv->r_debug == (CORE_ADDR) -1 || priv->r_debug == 0) | |
5320 | { | |
5321 | document = xstrdup ("<library-list-svr4 version=\"1.0\"/>\n"); | |
5322 | } | |
5323 | else | |
5324 | { | |
5325 | int allocated = 1024; | |
5326 | char *p; | |
5327 | const int ptr_size = is_elf64 ? 8 : 4; | |
5328 | CORE_ADDR lm_addr, lm_prev, l_name, l_addr, l_ld, l_next, l_prev; | |
5329 | int r_version, header_done = 0; | |
5330 | ||
5331 | document = xmalloc (allocated); | |
5332 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5333 | p = document + strlen (document); | |
5334 | ||
5335 | r_version = 0; | |
5336 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, | |
5337 | (unsigned char *) &r_version, | |
5338 | sizeof (r_version)) != 0 | |
5339 | || r_version != 1) | |
5340 | { | |
5341 | warning ("unexpected r_debug version %d", r_version); | |
5342 | goto done; | |
5343 | } | |
5344 | ||
5345 | if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5346 | &lm_addr, ptr_size) != 0) | |
5347 | { | |
5348 | warning ("unable to read r_map from 0x%lx", | |
5349 | (long) priv->r_debug + lmo->r_map_offset); | |
5350 | goto done; | |
5351 | } | |
5352 | ||
5353 | lm_prev = 0; | |
5354 | while (read_one_ptr (lm_addr + lmo->l_name_offset, | |
5355 | &l_name, ptr_size) == 0 | |
5356 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5357 | &l_addr, ptr_size) == 0 | |
5358 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5359 | &l_ld, ptr_size) == 0 | |
5360 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5361 | &l_prev, ptr_size) == 0 | |
5362 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5363 | &l_next, ptr_size) == 0) | |
5364 | { | |
5365 | unsigned char libname[PATH_MAX]; | |
5366 | ||
5367 | if (lm_prev != l_prev) | |
5368 | { | |
5369 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", | |
5370 | (long) lm_prev, (long) l_prev); | |
5371 | break; | |
5372 | } | |
5373 | ||
5374 | /* Not checking for error because reading may stop before | |
5375 | we've got PATH_MAX worth of characters. */ | |
5376 | libname[0] = '\0'; | |
5377 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5378 | libname[sizeof (libname) - 1] = '\0'; | |
5379 | if (libname[0] != '\0') | |
5380 | { | |
5381 | /* 6x the size for xml_escape_text below. */ | |
5382 | size_t len = 6 * strlen ((char *) libname); | |
5383 | char *name; | |
5384 | ||
5385 | if (!header_done) | |
5386 | { | |
5387 | /* Terminate `<library-list-svr4'. */ | |
5388 | *p++ = '>'; | |
5389 | header_done = 1; | |
5390 | } | |
5391 | ||
5392 | while (allocated < p - document + len + 200) | |
5393 | { | |
5394 | /* Expand to guarantee sufficient storage. */ | |
5395 | uintptr_t document_len = p - document; | |
5396 | ||
5397 | document = xrealloc (document, 2 * allocated); | |
5398 | allocated *= 2; | |
5399 | p = document + document_len; | |
5400 | } | |
5401 | ||
5402 | name = xml_escape_text ((char *) libname); | |
5403 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5404 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5405 | name, (unsigned long) lm_addr, | |
5406 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5407 | free (name); | |
5408 | } | |
5409 | else if (lm_prev == 0) | |
5410 | { | |
5411 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); | |
5412 | p = p + strlen (p); | |
5413 | } | |
5414 | ||
5415 | if (l_next == 0) | |
5416 | break; | |
5417 | ||
5418 | lm_prev = lm_addr; | |
5419 | lm_addr = l_next; | |
5420 | } | |
5421 | done: | |
5422 | strcpy (p, "</library-list-svr4>"); | |
5423 | } | |
5424 | ||
5425 | document_len = strlen (document); | |
5426 | if (offset < document_len) | |
5427 | document_len -= offset; | |
5428 | else | |
5429 | document_len = 0; | |
5430 | if (len > document_len) | |
5431 | len = document_len; | |
5432 | ||
5433 | memcpy (readbuf, document + offset, len); | |
5434 | xfree (document); | |
5435 | ||
5436 | return len; | |
5437 | } | |
5438 | ||
ce3a066d DJ |
5439 | static struct target_ops linux_target_ops = { |
5440 | linux_create_inferior, | |
5441 | linux_attach, | |
5442 | linux_kill, | |
6ad8ae5c | 5443 | linux_detach, |
8336d594 | 5444 | linux_mourn, |
444d6139 | 5445 | linux_join, |
ce3a066d DJ |
5446 | linux_thread_alive, |
5447 | linux_resume, | |
5448 | linux_wait, | |
5449 | linux_fetch_registers, | |
5450 | linux_store_registers, | |
90d74c30 | 5451 | linux_prepare_to_access_memory, |
0146f85b | 5452 | linux_done_accessing_memory, |
ce3a066d DJ |
5453 | linux_read_memory, |
5454 | linux_write_memory, | |
2f2893d9 | 5455 | linux_look_up_symbols, |
ef57601b | 5456 | linux_request_interrupt, |
aa691b87 | 5457 | linux_read_auxv, |
d993e290 PA |
5458 | linux_insert_point, |
5459 | linux_remove_point, | |
e013ee27 OF |
5460 | linux_stopped_by_watchpoint, |
5461 | linux_stopped_data_address, | |
42c81e2a | 5462 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 5463 | linux_read_offsets, |
dae5f5cf DJ |
5464 | #else |
5465 | NULL, | |
5466 | #endif | |
5467 | #ifdef USE_THREAD_DB | |
5468 | thread_db_get_tls_address, | |
5469 | #else | |
5470 | NULL, | |
52fb6437 | 5471 | #endif |
efcbbd14 | 5472 | linux_qxfer_spu, |
59a016f0 | 5473 | hostio_last_error_from_errno, |
07e059b5 | 5474 | linux_qxfer_osdata, |
4aa995e1 | 5475 | linux_xfer_siginfo, |
bd99dc85 PA |
5476 | linux_supports_non_stop, |
5477 | linux_async, | |
5478 | linux_start_non_stop, | |
cdbfd419 PP |
5479 | linux_supports_multi_process, |
5480 | #ifdef USE_THREAD_DB | |
dc146f7c | 5481 | thread_db_handle_monitor_command, |
cdbfd419 | 5482 | #else |
dc146f7c | 5483 | NULL, |
cdbfd419 | 5484 | #endif |
d26e3629 | 5485 | linux_common_core_of_thread, |
78d85199 | 5486 | linux_read_loadmap, |
219f2f23 PA |
5487 | linux_process_qsupported, |
5488 | linux_supports_tracepoints, | |
5489 | linux_read_pc, | |
8336d594 PA |
5490 | linux_write_pc, |
5491 | linux_thread_stopped, | |
7984d532 | 5492 | NULL, |
711e434b | 5493 | linux_pause_all, |
7984d532 | 5494 | linux_unpause_all, |
fa593d66 PA |
5495 | linux_cancel_breakpoints, |
5496 | linux_stabilize_threads, | |
6a271cae | 5497 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
5498 | linux_emit_ops, |
5499 | linux_supports_disable_randomization, | |
405f8e94 | 5500 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 5501 | linux_qxfer_libraries_svr4, |
ce3a066d DJ |
5502 | }; |
5503 | ||
0d62e5e8 DJ |
5504 | static void |
5505 | linux_init_signals () | |
5506 | { | |
5507 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5508 | to find what the cancel signal actually is. */ | |
1a981360 | 5509 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5510 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5511 | #endif |
0d62e5e8 DJ |
5512 | } |
5513 | ||
da6d8c04 DJ |
5514 | void |
5515 | initialize_low (void) | |
5516 | { | |
bd99dc85 PA |
5517 | struct sigaction sigchld_action; |
5518 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5519 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5520 | set_breakpoint_data (the_low_target.breakpoint, |
5521 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5522 | linux_init_signals (); |
24a09b5f | 5523 | linux_test_for_tracefork (); |
52fa2412 UW |
5524 | #ifdef HAVE_LINUX_REGSETS |
5525 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
5526 | ; | |
bca929d3 | 5527 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 5528 | #endif |
bd99dc85 PA |
5529 | |
5530 | sigchld_action.sa_handler = sigchld_handler; | |
5531 | sigemptyset (&sigchld_action.sa_mask); | |
5532 | sigchld_action.sa_flags = SA_RESTART; | |
5533 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 5534 | } |