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