Commit | Line | Data |
---|---|---|
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 | |
05044653 PA |
95 | /* A list of all unknown processes which receive stop signals. Some |
96 | other process will presumably claim each of these as forked | |
97 | children momentarily. */ | |
24a09b5f | 98 | |
05044653 PA |
99 | struct simple_pid_list |
100 | { | |
101 | /* The process ID. */ | |
102 | int pid; | |
103 | ||
104 | /* The status as reported by waitpid. */ | |
105 | int status; | |
106 | ||
107 | /* Next in chain. */ | |
108 | struct simple_pid_list *next; | |
109 | }; | |
110 | struct simple_pid_list *stopped_pids; | |
111 | ||
112 | /* Trivial list manipulation functions to keep track of a list of new | |
113 | stopped processes. */ | |
114 | ||
115 | static void | |
116 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
117 | { | |
118 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
119 | ||
120 | new_pid->pid = pid; | |
121 | new_pid->status = status; | |
122 | new_pid->next = *listp; | |
123 | *listp = new_pid; | |
124 | } | |
125 | ||
126 | static int | |
127 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
128 | { | |
129 | struct simple_pid_list **p; | |
130 | ||
131 | for (p = listp; *p != NULL; p = &(*p)->next) | |
132 | if ((*p)->pid == pid) | |
133 | { | |
134 | struct simple_pid_list *next = (*p)->next; | |
135 | ||
136 | *statusp = (*p)->status; | |
137 | xfree (*p); | |
138 | *p = next; | |
139 | return 1; | |
140 | } | |
141 | return 0; | |
142 | } | |
24a09b5f | 143 | |
0d62e5e8 DJ |
144 | /* FIXME this is a bit of a hack, and could be removed. */ |
145 | int stopping_threads; | |
146 | ||
147 | /* FIXME make into a target method? */ | |
24a09b5f | 148 | int using_threads = 1; |
24a09b5f | 149 | |
fa593d66 PA |
150 | /* True if we're presently stabilizing threads (moving them out of |
151 | jump pads). */ | |
152 | static int stabilizing_threads; | |
153 | ||
95954743 PA |
154 | /* This flag is true iff we've just created or attached to our first |
155 | inferior but it has not stopped yet. As soon as it does, we need | |
156 | to call the low target's arch_setup callback. Doing this only on | |
157 | the first inferior avoids reinializing the architecture on every | |
158 | inferior, and avoids messing with the register caches of the | |
159 | already running inferiors. NOTE: this assumes all inferiors under | |
160 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
161 | static int new_inferior; |
162 | ||
2acc282a | 163 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 164 | int step, int signal, siginfo_t *info); |
2bd7c093 | 165 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
166 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
167 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 168 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 169 | static void *add_lwp (ptid_t ptid); |
c35fafde | 170 | static int linux_stopped_by_watchpoint (void); |
95954743 | 171 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 172 | static void proceed_all_lwps (void); |
d50171e4 PA |
173 | static int finish_step_over (struct lwp_info *lwp); |
174 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
175 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 176 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
177 | |
178 | /* True if the low target can hardware single-step. Such targets | |
179 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
180 | ||
181 | static int | |
182 | can_hardware_single_step (void) | |
183 | { | |
184 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
185 | } | |
186 | ||
187 | /* True if the low target supports memory breakpoints. If so, we'll | |
188 | have a GET_PC implementation. */ | |
189 | ||
190 | static int | |
191 | supports_breakpoints (void) | |
192 | { | |
193 | return (the_low_target.get_pc != NULL); | |
194 | } | |
0d62e5e8 | 195 | |
fa593d66 PA |
196 | /* Returns true if this target can support fast tracepoints. This |
197 | does not mean that the in-process agent has been loaded in the | |
198 | inferior. */ | |
199 | ||
200 | static int | |
201 | supports_fast_tracepoints (void) | |
202 | { | |
203 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
204 | } | |
205 | ||
0d62e5e8 DJ |
206 | struct pending_signals |
207 | { | |
208 | int signal; | |
32ca6d61 | 209 | siginfo_t info; |
0d62e5e8 DJ |
210 | struct pending_signals *prev; |
211 | }; | |
611cb4a5 | 212 | |
14ce3065 DE |
213 | #define PTRACE_ARG3_TYPE void * |
214 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 215 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 216 | |
58caa3dc | 217 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
218 | static char *disabled_regsets; |
219 | static int num_regsets; | |
58caa3dc DJ |
220 | #endif |
221 | ||
bd99dc85 PA |
222 | /* The read/write ends of the pipe registered as waitable file in the |
223 | event loop. */ | |
224 | static int linux_event_pipe[2] = { -1, -1 }; | |
225 | ||
226 | /* True if we're currently in async mode. */ | |
227 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
228 | ||
02fc4de7 | 229 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
230 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
231 | ||
d0722149 DE |
232 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
233 | ||
234 | static int | |
957f3f49 | 235 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
236 | { |
237 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
238 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
239 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
240 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
241 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
242 | } | |
243 | ||
244 | /* Return non-zero if FILE is a 64-bit ELF file, | |
245 | zero if the file is not a 64-bit ELF file, | |
246 | and -1 if the file is not accessible or doesn't exist. */ | |
247 | ||
be07f1a2 | 248 | static int |
d0722149 DE |
249 | elf_64_file_p (const char *file) |
250 | { | |
957f3f49 | 251 | Elf64_Ehdr header; |
d0722149 DE |
252 | int fd; |
253 | ||
254 | fd = open (file, O_RDONLY); | |
255 | if (fd < 0) | |
256 | return -1; | |
257 | ||
258 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
259 | { | |
260 | close (fd); | |
261 | return 0; | |
262 | } | |
263 | close (fd); | |
264 | ||
265 | return elf_64_header_p (&header); | |
266 | } | |
267 | ||
be07f1a2 PA |
268 | /* Accepts an integer PID; Returns true if the executable PID is |
269 | running is a 64-bit ELF file.. */ | |
270 | ||
271 | int | |
272 | linux_pid_exe_is_elf_64_file (int pid) | |
273 | { | |
274 | char file[MAXPATHLEN]; | |
275 | ||
276 | sprintf (file, "/proc/%d/exe", pid); | |
277 | return elf_64_file_p (file); | |
278 | } | |
279 | ||
bd99dc85 PA |
280 | static void |
281 | delete_lwp (struct lwp_info *lwp) | |
282 | { | |
283 | remove_thread (get_lwp_thread (lwp)); | |
284 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 285 | free (lwp->arch_private); |
bd99dc85 PA |
286 | free (lwp); |
287 | } | |
288 | ||
95954743 PA |
289 | /* Add a process to the common process list, and set its private |
290 | data. */ | |
291 | ||
292 | static struct process_info * | |
293 | linux_add_process (int pid, int attached) | |
294 | { | |
295 | struct process_info *proc; | |
296 | ||
297 | /* Is this the first process? If so, then set the arch. */ | |
298 | if (all_processes.head == NULL) | |
299 | new_inferior = 1; | |
300 | ||
301 | proc = add_process (pid, attached); | |
302 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
303 | ||
aa5ca48f DE |
304 | if (the_low_target.new_process != NULL) |
305 | proc->private->arch_private = the_low_target.new_process (); | |
306 | ||
95954743 PA |
307 | return proc; |
308 | } | |
309 | ||
07d4f67e DE |
310 | /* Wrapper function for waitpid which handles EINTR, and emulates |
311 | __WALL for systems where that is not available. */ | |
312 | ||
313 | static int | |
314 | my_waitpid (int pid, int *status, int flags) | |
315 | { | |
316 | int ret, out_errno; | |
317 | ||
318 | if (debug_threads) | |
319 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
320 | ||
321 | if (flags & __WALL) | |
322 | { | |
323 | sigset_t block_mask, org_mask, wake_mask; | |
324 | int wnohang; | |
325 | ||
326 | wnohang = (flags & WNOHANG) != 0; | |
327 | flags &= ~(__WALL | __WCLONE); | |
328 | flags |= WNOHANG; | |
329 | ||
330 | /* Block all signals while here. This avoids knowing about | |
331 | LinuxThread's signals. */ | |
332 | sigfillset (&block_mask); | |
333 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
334 | ||
335 | /* ... except during the sigsuspend below. */ | |
336 | sigemptyset (&wake_mask); | |
337 | ||
338 | while (1) | |
339 | { | |
340 | /* Since all signals are blocked, there's no need to check | |
341 | for EINTR here. */ | |
342 | ret = waitpid (pid, status, flags); | |
343 | out_errno = errno; | |
344 | ||
345 | if (ret == -1 && out_errno != ECHILD) | |
346 | break; | |
347 | else if (ret > 0) | |
348 | break; | |
349 | ||
350 | if (flags & __WCLONE) | |
351 | { | |
352 | /* We've tried both flavors now. If WNOHANG is set, | |
353 | there's nothing else to do, just bail out. */ | |
354 | if (wnohang) | |
355 | break; | |
356 | ||
357 | if (debug_threads) | |
358 | fprintf (stderr, "blocking\n"); | |
359 | ||
360 | /* Block waiting for signals. */ | |
361 | sigsuspend (&wake_mask); | |
362 | } | |
363 | ||
364 | flags ^= __WCLONE; | |
365 | } | |
366 | ||
367 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
368 | } | |
369 | else | |
370 | { | |
371 | do | |
372 | ret = waitpid (pid, status, flags); | |
373 | while (ret == -1 && errno == EINTR); | |
374 | out_errno = errno; | |
375 | } | |
376 | ||
377 | if (debug_threads) | |
378 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
379 | pid, flags, status ? *status : -1, ret); | |
380 | ||
381 | errno = out_errno; | |
382 | return ret; | |
383 | } | |
384 | ||
bd99dc85 PA |
385 | /* Handle a GNU/Linux extended wait response. If we see a clone |
386 | event, we need to add the new LWP to our list (and not report the | |
387 | trap to higher layers). */ | |
0d62e5e8 | 388 | |
24a09b5f | 389 | static void |
54a0b537 | 390 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
391 | { |
392 | int event = wstat >> 16; | |
54a0b537 | 393 | struct lwp_info *new_lwp; |
24a09b5f DJ |
394 | |
395 | if (event == PTRACE_EVENT_CLONE) | |
396 | { | |
95954743 | 397 | ptid_t ptid; |
24a09b5f | 398 | unsigned long new_pid; |
05044653 | 399 | int ret, status; |
24a09b5f | 400 | |
bd99dc85 | 401 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
402 | |
403 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 404 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
405 | { |
406 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
407 | hits the SIGSTOP, but we're already attached. */ | |
408 | ||
97438e3f | 409 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
410 | |
411 | if (ret == -1) | |
412 | perror_with_name ("waiting for new child"); | |
413 | else if (ret != new_pid) | |
414 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 415 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
416 | warning ("wait returned unexpected status 0x%x", status); |
417 | } | |
418 | ||
1e7fc18c | 419 | linux_enable_event_reporting (new_pid); |
24a09b5f | 420 | |
95954743 PA |
421 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
422 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
423 | add_thread (ptid, new_lwp); | |
24a09b5f | 424 | |
e27d73f6 DE |
425 | /* Either we're going to immediately resume the new thread |
426 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
427 | thinks the thread is currently running, so set this first | |
428 | before calling linux_resume_one_lwp. */ | |
429 | new_lwp->stopped = 1; | |
430 | ||
da5898ce DJ |
431 | /* Normally we will get the pending SIGSTOP. But in some cases |
432 | we might get another signal delivered to the group first. | |
f21cc1a2 | 433 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
434 | if (WSTOPSIG (status) == SIGSTOP) |
435 | { | |
d50171e4 PA |
436 | if (stopping_threads) |
437 | new_lwp->stop_pc = get_stop_pc (new_lwp); | |
438 | else | |
e27d73f6 | 439 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 440 | } |
24a09b5f | 441 | else |
da5898ce | 442 | { |
54a0b537 | 443 | new_lwp->stop_expected = 1; |
d50171e4 | 444 | |
da5898ce DJ |
445 | if (stopping_threads) |
446 | { | |
d50171e4 | 447 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
448 | new_lwp->status_pending_p = 1; |
449 | new_lwp->status_pending = status; | |
da5898ce DJ |
450 | } |
451 | else | |
452 | /* Pass the signal on. This is what GDB does - except | |
453 | shouldn't we really report it instead? */ | |
e27d73f6 | 454 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 455 | } |
24a09b5f DJ |
456 | |
457 | /* Always resume the current thread. If we are stopping | |
458 | threads, it will have a pending SIGSTOP; we may as well | |
459 | collect it now. */ | |
2acc282a | 460 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
461 | } |
462 | } | |
463 | ||
d50171e4 PA |
464 | /* Return the PC as read from the regcache of LWP, without any |
465 | adjustment. */ | |
466 | ||
467 | static CORE_ADDR | |
468 | get_pc (struct lwp_info *lwp) | |
469 | { | |
470 | struct thread_info *saved_inferior; | |
471 | struct regcache *regcache; | |
472 | CORE_ADDR pc; | |
473 | ||
474 | if (the_low_target.get_pc == NULL) | |
475 | return 0; | |
476 | ||
477 | saved_inferior = current_inferior; | |
478 | current_inferior = get_lwp_thread (lwp); | |
479 | ||
480 | regcache = get_thread_regcache (current_inferior, 1); | |
481 | pc = (*the_low_target.get_pc) (regcache); | |
482 | ||
483 | if (debug_threads) | |
484 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
485 | ||
486 | current_inferior = saved_inferior; | |
487 | return pc; | |
488 | } | |
489 | ||
490 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
491 | The SIGTRAP could mean several things. |
492 | ||
493 | On i386, where decr_pc_after_break is non-zero: | |
494 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
495 | we will get only the one SIGTRAP (even if the instruction we | |
496 | stepped over was a breakpoint). The value of $eip will be the | |
497 | next instruction. | |
498 | If we continue the process using PTRACE_CONT, we will get a | |
499 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
500 | the instruction after the breakpoint (i.e. needs to be | |
501 | decremented). If we report the SIGTRAP to GDB, we must also | |
502 | report the undecremented PC. If we cancel the SIGTRAP, we | |
503 | must resume at the decremented PC. | |
504 | ||
505 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
506 | with hardware or kernel single-step: | |
507 | If we single-step over a breakpoint instruction, our PC will | |
508 | point at the following instruction. If we continue and hit a | |
509 | breakpoint instruction, our PC will point at the breakpoint | |
510 | instruction. */ | |
511 | ||
512 | static CORE_ADDR | |
d50171e4 | 513 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 514 | { |
d50171e4 PA |
515 | CORE_ADDR stop_pc; |
516 | ||
517 | if (the_low_target.get_pc == NULL) | |
518 | return 0; | |
0d62e5e8 | 519 | |
d50171e4 PA |
520 | stop_pc = get_pc (lwp); |
521 | ||
bdabb078 PA |
522 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
523 | && !lwp->stepping | |
524 | && !lwp->stopped_by_watchpoint | |
525 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
526 | stop_pc -= the_low_target.decr_pc_after_break; |
527 | ||
528 | if (debug_threads) | |
529 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
530 | ||
531 | return stop_pc; | |
0d62e5e8 | 532 | } |
ce3a066d | 533 | |
0d62e5e8 | 534 | static void * |
95954743 | 535 | add_lwp (ptid_t ptid) |
611cb4a5 | 536 | { |
54a0b537 | 537 | struct lwp_info *lwp; |
0d62e5e8 | 538 | |
54a0b537 PA |
539 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
540 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 541 | |
95954743 | 542 | lwp->head.id = ptid; |
0d62e5e8 | 543 | |
aa5ca48f DE |
544 | if (the_low_target.new_thread != NULL) |
545 | lwp->arch_private = the_low_target.new_thread (); | |
546 | ||
54a0b537 | 547 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 548 | |
54a0b537 | 549 | return lwp; |
0d62e5e8 | 550 | } |
611cb4a5 | 551 | |
da6d8c04 DJ |
552 | /* Start an inferior process and returns its pid. |
553 | ALLARGS is a vector of program-name and args. */ | |
554 | ||
ce3a066d DJ |
555 | static int |
556 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 557 | { |
03583c20 UW |
558 | #ifdef HAVE_PERSONALITY |
559 | int personality_orig = 0, personality_set = 0; | |
560 | #endif | |
a6dbe5df | 561 | struct lwp_info *new_lwp; |
da6d8c04 | 562 | int pid; |
95954743 | 563 | ptid_t ptid; |
da6d8c04 | 564 | |
03583c20 UW |
565 | #ifdef HAVE_PERSONALITY |
566 | if (disable_randomization) | |
567 | { | |
568 | errno = 0; | |
569 | personality_orig = personality (0xffffffff); | |
570 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
571 | { | |
572 | personality_set = 1; | |
573 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
574 | } | |
575 | if (errno != 0 || (personality_set | |
576 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
577 | warning ("Error disabling address space randomization: %s", | |
578 | strerror (errno)); | |
579 | } | |
580 | #endif | |
581 | ||
42c81e2a | 582 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
583 | pid = vfork (); |
584 | #else | |
da6d8c04 | 585 | pid = fork (); |
52fb6437 | 586 | #endif |
da6d8c04 DJ |
587 | if (pid < 0) |
588 | perror_with_name ("fork"); | |
589 | ||
590 | if (pid == 0) | |
591 | { | |
592 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
593 | ||
1a981360 | 594 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 595 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 596 | #endif |
0d62e5e8 | 597 | |
a9fa9f7d DJ |
598 | setpgid (0, 0); |
599 | ||
e0f9f062 DE |
600 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
601 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
602 | Also, redirect stdin to /dev/null. */ | |
603 | if (remote_connection_is_stdio ()) | |
604 | { | |
605 | close (0); | |
606 | open ("/dev/null", O_RDONLY); | |
607 | dup2 (2, 1); | |
3e52c33d JK |
608 | if (write (2, "stdin/stdout redirected\n", |
609 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
610 | /* Errors ignored. */; | |
e0f9f062 DE |
611 | } |
612 | ||
2b876972 DJ |
613 | execv (program, allargs); |
614 | if (errno == ENOENT) | |
615 | execvp (program, allargs); | |
da6d8c04 DJ |
616 | |
617 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 618 | strerror (errno)); |
da6d8c04 DJ |
619 | fflush (stderr); |
620 | _exit (0177); | |
621 | } | |
622 | ||
03583c20 UW |
623 | #ifdef HAVE_PERSONALITY |
624 | if (personality_set) | |
625 | { | |
626 | errno = 0; | |
627 | personality (personality_orig); | |
628 | if (errno != 0) | |
629 | warning ("Error restoring address space randomization: %s", | |
630 | strerror (errno)); | |
631 | } | |
632 | #endif | |
633 | ||
95954743 PA |
634 | linux_add_process (pid, 0); |
635 | ||
636 | ptid = ptid_build (pid, pid, 0); | |
637 | new_lwp = add_lwp (ptid); | |
638 | add_thread (ptid, new_lwp); | |
a6dbe5df | 639 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 640 | |
a9fa9f7d | 641 | return pid; |
da6d8c04 DJ |
642 | } |
643 | ||
644 | /* Attach to an inferior process. */ | |
645 | ||
95954743 PA |
646 | static void |
647 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 648 | { |
95954743 | 649 | ptid_t ptid; |
54a0b537 | 650 | struct lwp_info *new_lwp; |
611cb4a5 | 651 | |
95954743 | 652 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 653 | { |
95954743 | 654 | if (!initial) |
2d717e4f DJ |
655 | { |
656 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 657 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
658 | strerror (errno), errno); |
659 | fflush (stderr); | |
660 | return; | |
661 | } | |
662 | else | |
663 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 664 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 665 | strerror (errno), errno); |
da6d8c04 DJ |
666 | } |
667 | ||
95954743 | 668 | if (initial) |
e3deef73 LM |
669 | /* If lwp is the tgid, we handle adding existing threads later. |
670 | Otherwise we just add lwp without bothering about any other | |
671 | threads. */ | |
95954743 PA |
672 | ptid = ptid_build (lwpid, lwpid, 0); |
673 | else | |
674 | { | |
675 | /* Note that extracting the pid from the current inferior is | |
676 | safe, since we're always called in the context of the same | |
677 | process as this new thread. */ | |
678 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
679 | ptid = ptid_build (pid, lwpid, 0); | |
680 | } | |
24a09b5f | 681 | |
95954743 PA |
682 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
683 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 684 | |
a6dbe5df PA |
685 | /* We need to wait for SIGSTOP before being able to make the next |
686 | ptrace call on this LWP. */ | |
687 | new_lwp->must_set_ptrace_flags = 1; | |
688 | ||
644cebc9 | 689 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
690 | { |
691 | if (debug_threads) | |
692 | fprintf (stderr, | |
693 | "Attached to a stopped process\n"); | |
694 | ||
695 | /* The process is definitely stopped. It is in a job control | |
696 | stop, unless the kernel predates the TASK_STOPPED / | |
697 | TASK_TRACED distinction, in which case it might be in a | |
698 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
699 | can kill it, signal it, et cetera. | |
700 | ||
701 | First make sure there is a pending SIGSTOP. Since we are | |
702 | already attached, the process can not transition from stopped | |
703 | to running without a PTRACE_CONT; so we know this signal will | |
704 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
705 | probably already in the queue (unless this kernel is old | |
706 | enough to use TASK_STOPPED for ptrace stops); but since | |
707 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
708 | kill_lwp (lwpid, SIGSTOP); | |
709 | ||
710 | /* Finally, resume the stopped process. This will deliver the | |
711 | SIGSTOP (or a higher priority signal, just like normal | |
712 | PTRACE_ATTACH), which we'll catch later on. */ | |
713 | ptrace (PTRACE_CONT, lwpid, 0, 0); | |
714 | } | |
715 | ||
0d62e5e8 | 716 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
717 | brings it to a halt. |
718 | ||
719 | There are several cases to consider here: | |
720 | ||
721 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 722 | of a new thread that is being created. |
d50171e4 PA |
723 | In this case we should ignore that SIGSTOP and resume the |
724 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 725 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 726 | resume_continue. |
0e21c1ec DE |
727 | |
728 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
729 | to it via attach_inferior. |
730 | In this case we want the process thread to stop. | |
d50171e4 PA |
731 | This is handled by having linux_attach set last_resume_kind == |
732 | resume_stop after we return. | |
e3deef73 LM |
733 | |
734 | If the pid we are attaching to is also the tgid, we attach to and | |
735 | stop all the existing threads. Otherwise, we attach to pid and | |
736 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
737 | |
738 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
739 | existing threads. |
740 | In this case we want the thread to stop. | |
741 | FIXME: This case is currently not properly handled. | |
742 | We should wait for the SIGSTOP but don't. Things work apparently | |
743 | because enough time passes between when we ptrace (ATTACH) and when | |
744 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
745 | |
746 | On the other hand, if we are currently trying to stop all threads, we | |
747 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 748 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
749 | end of the list, and so the new thread has not yet reached |
750 | wait_for_sigstop (but will). */ | |
d50171e4 | 751 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
752 | } |
753 | ||
95954743 PA |
754 | void |
755 | linux_attach_lwp (unsigned long lwpid) | |
756 | { | |
757 | linux_attach_lwp_1 (lwpid, 0); | |
758 | } | |
759 | ||
e3deef73 LM |
760 | /* Attach to PID. If PID is the tgid, attach to it and all |
761 | of its threads. */ | |
762 | ||
0d62e5e8 | 763 | int |
a1928bad | 764 | linux_attach (unsigned long pid) |
0d62e5e8 | 765 | { |
e3deef73 LM |
766 | /* Attach to PID. We will check for other threads |
767 | soon. */ | |
95954743 | 768 | linux_attach_lwp_1 (pid, 1); |
95954743 | 769 | linux_add_process (pid, 1); |
0d62e5e8 | 770 | |
bd99dc85 PA |
771 | if (!non_stop) |
772 | { | |
8336d594 PA |
773 | struct thread_info *thread; |
774 | ||
775 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
776 | process. It will be collected by wait shortly. */ | |
777 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
778 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 779 | } |
0d62e5e8 | 780 | |
e3deef73 LM |
781 | if (linux_proc_get_tgid (pid) == pid) |
782 | { | |
783 | DIR *dir; | |
784 | char pathname[128]; | |
785 | ||
786 | sprintf (pathname, "/proc/%ld/task", pid); | |
787 | ||
788 | dir = opendir (pathname); | |
789 | ||
790 | if (!dir) | |
791 | { | |
792 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
793 | fflush (stderr); | |
794 | } | |
795 | else | |
796 | { | |
797 | /* At this point we attached to the tgid. Scan the task for | |
798 | existing threads. */ | |
799 | unsigned long lwp; | |
800 | int new_threads_found; | |
801 | int iterations = 0; | |
802 | struct dirent *dp; | |
803 | ||
804 | while (iterations < 2) | |
805 | { | |
806 | new_threads_found = 0; | |
807 | /* Add all the other threads. While we go through the | |
808 | threads, new threads may be spawned. Cycle through | |
809 | the list of threads until we have done two iterations without | |
810 | finding new threads. */ | |
811 | while ((dp = readdir (dir)) != NULL) | |
812 | { | |
813 | /* Fetch one lwp. */ | |
814 | lwp = strtoul (dp->d_name, NULL, 10); | |
815 | ||
816 | /* Is this a new thread? */ | |
817 | if (lwp | |
818 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
819 | { | |
820 | linux_attach_lwp_1 (lwp, 0); | |
821 | new_threads_found++; | |
822 | ||
823 | if (debug_threads) | |
824 | fprintf (stderr, "\ | |
825 | Found and attached to new lwp %ld\n", lwp); | |
826 | } | |
827 | } | |
828 | ||
829 | if (!new_threads_found) | |
830 | iterations++; | |
831 | else | |
832 | iterations = 0; | |
833 | ||
834 | rewinddir (dir); | |
835 | } | |
836 | closedir (dir); | |
837 | } | |
838 | } | |
839 | ||
95954743 PA |
840 | return 0; |
841 | } | |
842 | ||
843 | struct counter | |
844 | { | |
845 | int pid; | |
846 | int count; | |
847 | }; | |
848 | ||
849 | static int | |
850 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
851 | { | |
852 | struct counter *counter = args; | |
853 | ||
854 | if (ptid_get_pid (entry->id) == counter->pid) | |
855 | { | |
856 | if (++counter->count > 1) | |
857 | return 1; | |
858 | } | |
d61ddec4 | 859 | |
da6d8c04 DJ |
860 | return 0; |
861 | } | |
862 | ||
95954743 PA |
863 | static int |
864 | last_thread_of_process_p (struct thread_info *thread) | |
865 | { | |
866 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
867 | int pid = ptid_get_pid (ptid); | |
868 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 869 | |
95954743 PA |
870 | return (find_inferior (&all_threads, |
871 | second_thread_of_pid_p, &counter) == NULL); | |
872 | } | |
873 | ||
da84f473 PA |
874 | /* Kill LWP. */ |
875 | ||
876 | static void | |
877 | linux_kill_one_lwp (struct lwp_info *lwp) | |
878 | { | |
879 | int pid = lwpid_of (lwp); | |
880 | ||
881 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
882 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
883 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
884 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
885 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
886 | per process, not one for each thread. But since we still support | |
887 | linuxthreads, and we also support debugging programs using raw | |
888 | clone without CLONE_THREAD, we send one for each thread. For | |
889 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
890 | about some old kernels where PTRACE_KILL might work better | |
891 | (dubious if there are any such, but that's why it's paranoia), so | |
892 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
893 | everywhere. */ | |
894 | ||
895 | errno = 0; | |
896 | kill (pid, SIGKILL); | |
897 | if (debug_threads) | |
898 | fprintf (stderr, | |
899 | "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
900 | target_pid_to_str (ptid_of (lwp)), | |
901 | errno ? strerror (errno) : "OK"); | |
902 | ||
903 | errno = 0; | |
904 | ptrace (PTRACE_KILL, pid, 0, 0); | |
905 | if (debug_threads) | |
906 | fprintf (stderr, | |
907 | "LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
908 | target_pid_to_str (ptid_of (lwp)), | |
909 | errno ? strerror (errno) : "OK"); | |
910 | } | |
911 | ||
912 | /* Callback for `find_inferior'. Kills an lwp of a given process, | |
913 | except the leader. */ | |
95954743 PA |
914 | |
915 | static int | |
da84f473 | 916 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 917 | { |
0d62e5e8 | 918 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 919 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 920 | int wstat; |
95954743 PA |
921 | int pid = * (int *) args; |
922 | ||
923 | if (ptid_get_pid (entry->id) != pid) | |
924 | return 0; | |
0d62e5e8 | 925 | |
fd500816 DJ |
926 | /* We avoid killing the first thread here, because of a Linux kernel (at |
927 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
928 | the children get a chance to be reaped, it will remain a zombie | |
929 | forever. */ | |
95954743 | 930 | |
12b42a12 | 931 | if (lwpid_of (lwp) == pid) |
95954743 PA |
932 | { |
933 | if (debug_threads) | |
934 | fprintf (stderr, "lkop: is last of process %s\n", | |
935 | target_pid_to_str (entry->id)); | |
936 | return 0; | |
937 | } | |
fd500816 | 938 | |
0d62e5e8 DJ |
939 | do |
940 | { | |
da84f473 | 941 | linux_kill_one_lwp (lwp); |
0d62e5e8 DJ |
942 | |
943 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 944 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 945 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
946 | |
947 | return 0; | |
da6d8c04 DJ |
948 | } |
949 | ||
95954743 PA |
950 | static int |
951 | linux_kill (int pid) | |
0d62e5e8 | 952 | { |
95954743 | 953 | struct process_info *process; |
54a0b537 | 954 | struct lwp_info *lwp; |
fd500816 | 955 | int wstat; |
95954743 | 956 | int lwpid; |
fd500816 | 957 | |
95954743 PA |
958 | process = find_process_pid (pid); |
959 | if (process == NULL) | |
960 | return -1; | |
9d606399 | 961 | |
f9e39928 PA |
962 | /* If we're killing a running inferior, make sure it is stopped |
963 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 964 | stop_all_lwps (0, NULL); |
f9e39928 | 965 | |
da84f473 | 966 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 967 | |
54a0b537 | 968 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 969 | thread in the list, so do so now. */ |
95954743 | 970 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 971 | |
784867a5 | 972 | if (lwp == NULL) |
fd500816 | 973 | { |
784867a5 JK |
974 | if (debug_threads) |
975 | fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n", | |
976 | lwpid_of (lwp), pid); | |
977 | } | |
978 | else | |
979 | { | |
980 | if (debug_threads) | |
981 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", | |
982 | lwpid_of (lwp), pid); | |
fd500816 | 983 | |
784867a5 JK |
984 | do |
985 | { | |
da84f473 | 986 | linux_kill_one_lwp (lwp); |
784867a5 JK |
987 | |
988 | /* Make sure it died. The loop is most likely unnecessary. */ | |
989 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); | |
990 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
991 | } | |
2d717e4f | 992 | |
8336d594 | 993 | the_target->mourn (process); |
f9e39928 PA |
994 | |
995 | /* Since we presently can only stop all lwps of all processes, we | |
996 | need to unstop lwps of other processes. */ | |
7984d532 | 997 | unstop_all_lwps (0, NULL); |
95954743 | 998 | return 0; |
0d62e5e8 DJ |
999 | } |
1000 | ||
95954743 PA |
1001 | static int |
1002 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1003 | { |
1004 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1005 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1006 | int pid = * (int *) args; |
1007 | ||
1008 | if (ptid_get_pid (entry->id) != pid) | |
1009 | return 0; | |
6ad8ae5c | 1010 | |
ae13219e DJ |
1011 | /* If this process is stopped but is expecting a SIGSTOP, then make |
1012 | sure we take care of that now. This isn't absolutely guaranteed | |
1013 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 1014 | if (lwp->stop_expected) |
ae13219e | 1015 | { |
bd99dc85 | 1016 | int wstat; |
ae13219e | 1017 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 | 1018 | lwp->stop_expected = 0; |
f9e39928 | 1019 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 1020 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
1021 | } |
1022 | ||
1023 | /* Flush any pending changes to the process's registers. */ | |
1024 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 1025 | get_lwp_thread (lwp)); |
ae13219e DJ |
1026 | |
1027 | /* Finally, let it resume. */ | |
82bfbe7e PA |
1028 | if (the_low_target.prepare_to_resume != NULL) |
1029 | the_low_target.prepare_to_resume (lwp); | |
bd99dc85 PA |
1030 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
1031 | ||
1032 | delete_lwp (lwp); | |
95954743 | 1033 | return 0; |
6ad8ae5c DJ |
1034 | } |
1035 | ||
95954743 PA |
1036 | static int |
1037 | linux_detach (int pid) | |
1038 | { | |
1039 | struct process_info *process; | |
1040 | ||
1041 | process = find_process_pid (pid); | |
1042 | if (process == NULL) | |
1043 | return -1; | |
1044 | ||
f9e39928 PA |
1045 | /* Stop all threads before detaching. First, ptrace requires that |
1046 | the thread is stopped to sucessfully detach. Second, thread_db | |
1047 | may need to uninstall thread event breakpoints from memory, which | |
1048 | only works with a stopped process anyway. */ | |
7984d532 | 1049 | stop_all_lwps (0, NULL); |
f9e39928 | 1050 | |
ca5c370d | 1051 | #ifdef USE_THREAD_DB |
8336d594 | 1052 | thread_db_detach (process); |
ca5c370d PA |
1053 | #endif |
1054 | ||
fa593d66 PA |
1055 | /* Stabilize threads (move out of jump pads). */ |
1056 | stabilize_threads (); | |
1057 | ||
95954743 | 1058 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1059 | |
1060 | the_target->mourn (process); | |
f9e39928 PA |
1061 | |
1062 | /* Since we presently can only stop all lwps of all processes, we | |
1063 | need to unstop lwps of other processes. */ | |
7984d532 | 1064 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1065 | return 0; |
1066 | } | |
1067 | ||
1068 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1069 | ||
1070 | static int | |
1071 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1072 | { | |
1073 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1074 | struct process_info *process = proc; | |
1075 | ||
1076 | if (pid_of (lwp) == pid_of (process)) | |
1077 | delete_lwp (lwp); | |
1078 | ||
dd6953e1 | 1079 | return 0; |
6ad8ae5c DJ |
1080 | } |
1081 | ||
8336d594 PA |
1082 | static void |
1083 | linux_mourn (struct process_info *process) | |
1084 | { | |
1085 | struct process_info_private *priv; | |
1086 | ||
1087 | #ifdef USE_THREAD_DB | |
1088 | thread_db_mourn (process); | |
1089 | #endif | |
1090 | ||
f9e39928 PA |
1091 | find_inferior (&all_lwps, delete_lwp_callback, process); |
1092 | ||
8336d594 PA |
1093 | /* Freeing all private data. */ |
1094 | priv = process->private; | |
1095 | free (priv->arch_private); | |
1096 | free (priv); | |
1097 | process->private = NULL; | |
505106cd PA |
1098 | |
1099 | remove_process (process); | |
8336d594 PA |
1100 | } |
1101 | ||
444d6139 | 1102 | static void |
95954743 | 1103 | linux_join (int pid) |
444d6139 | 1104 | { |
444d6139 PA |
1105 | int status, ret; |
1106 | ||
1107 | do { | |
95954743 | 1108 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1109 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1110 | break; | |
1111 | } while (ret != -1 || errno != ECHILD); | |
1112 | } | |
1113 | ||
6ad8ae5c | 1114 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1115 | static int |
95954743 | 1116 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1117 | { |
95954743 PA |
1118 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1119 | ||
1120 | /* We assume we always know if a thread exits. If a whole process | |
1121 | exited but we still haven't been able to report it to GDB, we'll | |
1122 | hold on to the last lwp of the dead process. */ | |
1123 | if (lwp != NULL) | |
1124 | return !lwp->dead; | |
0d62e5e8 DJ |
1125 | else |
1126 | return 0; | |
1127 | } | |
1128 | ||
6bf5e0ba | 1129 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1130 | static int |
d50171e4 | 1131 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1132 | { |
54a0b537 | 1133 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1134 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1135 | struct thread_info *thread; |
95954743 PA |
1136 | |
1137 | /* Check if we're only interested in events from a specific process | |
1138 | or its lwps. */ | |
1139 | if (!ptid_equal (minus_one_ptid, ptid) | |
1140 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
1141 | return 0; | |
0d62e5e8 | 1142 | |
d50171e4 PA |
1143 | thread = get_lwp_thread (lwp); |
1144 | ||
1145 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1146 | report any status pending the LWP may have. */ | |
8336d594 | 1147 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1148 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1149 | return 0; |
0d62e5e8 | 1150 | |
d50171e4 | 1151 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1152 | } |
1153 | ||
95954743 PA |
1154 | static int |
1155 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1156 | { | |
1157 | ptid_t ptid = *(ptid_t *) data; | |
1158 | int lwp; | |
1159 | ||
1160 | if (ptid_get_lwp (ptid) != 0) | |
1161 | lwp = ptid_get_lwp (ptid); | |
1162 | else | |
1163 | lwp = ptid_get_pid (ptid); | |
1164 | ||
1165 | if (ptid_get_lwp (entry->id) == lwp) | |
1166 | return 1; | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | struct lwp_info * | |
1172 | find_lwp_pid (ptid_t ptid) | |
1173 | { | |
1174 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1175 | } | |
1176 | ||
bd99dc85 | 1177 | static struct lwp_info * |
95954743 | 1178 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1179 | { |
0d62e5e8 | 1180 | int ret; |
95954743 | 1181 | int to_wait_for = -1; |
bd99dc85 | 1182 | struct lwp_info *child = NULL; |
0d62e5e8 | 1183 | |
bd99dc85 | 1184 | if (debug_threads) |
95954743 PA |
1185 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1186 | ||
1187 | if (ptid_equal (ptid, minus_one_ptid)) | |
1188 | to_wait_for = -1; /* any child */ | |
1189 | else | |
1190 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1191 | |
bd99dc85 | 1192 | options |= __WALL; |
0d62e5e8 | 1193 | |
bd99dc85 | 1194 | retry: |
0d62e5e8 | 1195 | |
bd99dc85 PA |
1196 | ret = my_waitpid (to_wait_for, wstatp, options); |
1197 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1198 | return NULL; | |
1199 | else if (ret == -1) | |
1200 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1201 | |
1202 | if (debug_threads | |
1203 | && (!WIFSTOPPED (*wstatp) | |
1204 | || (WSTOPSIG (*wstatp) != 32 | |
1205 | && WSTOPSIG (*wstatp) != 33))) | |
1206 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1207 | ||
95954743 | 1208 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1209 | |
24a09b5f DJ |
1210 | /* If we didn't find a process, one of two things presumably happened: |
1211 | - A process we started and then detached from has exited. Ignore it. | |
1212 | - A process we are controlling has forked and the new child's stop | |
1213 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1214 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f | 1215 | { |
05044653 | 1216 | add_to_pid_list (&stopped_pids, ret, *wstatp); |
24a09b5f DJ |
1217 | goto retry; |
1218 | } | |
bd99dc85 | 1219 | else if (child == NULL) |
24a09b5f DJ |
1220 | goto retry; |
1221 | ||
bd99dc85 | 1222 | child->stopped = 1; |
0d62e5e8 | 1223 | |
bd99dc85 | 1224 | child->last_status = *wstatp; |
32ca6d61 | 1225 | |
d61ddec4 UW |
1226 | /* Architecture-specific setup after inferior is running. |
1227 | This needs to happen after we have attached to the inferior | |
1228 | and it is stopped for the first time, but before we access | |
1229 | any inferior registers. */ | |
1230 | if (new_inferior) | |
1231 | { | |
1232 | the_low_target.arch_setup (); | |
52fa2412 UW |
1233 | #ifdef HAVE_LINUX_REGSETS |
1234 | memset (disabled_regsets, 0, num_regsets); | |
1235 | #endif | |
d61ddec4 UW |
1236 | new_inferior = 0; |
1237 | } | |
1238 | ||
c3adc08c PA |
1239 | /* Fetch the possibly triggered data watchpoint info and store it in |
1240 | CHILD. | |
1241 | ||
1242 | On some archs, like x86, that use debug registers to set | |
1243 | watchpoints, it's possible that the way to know which watched | |
1244 | address trapped, is to check the register that is used to select | |
1245 | which address to watch. Problem is, between setting the | |
1246 | watchpoint and reading back which data address trapped, the user | |
1247 | may change the set of watchpoints, and, as a consequence, GDB | |
1248 | changes the debug registers in the inferior. To avoid reading | |
1249 | back a stale stopped-data-address when that happens, we cache in | |
1250 | LP the fact that a watchpoint trapped, and the corresponding data | |
1251 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1252 | changes the debug registers meanwhile, we have the cached data we | |
1253 | can rely on. */ | |
1254 | ||
1255 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1256 | { | |
1257 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1258 | { | |
1259 | child->stopped_by_watchpoint = 0; | |
1260 | } | |
1261 | else | |
1262 | { | |
1263 | struct thread_info *saved_inferior; | |
1264 | ||
1265 | saved_inferior = current_inferior; | |
1266 | current_inferior = get_lwp_thread (child); | |
1267 | ||
1268 | child->stopped_by_watchpoint | |
1269 | = the_low_target.stopped_by_watchpoint (); | |
1270 | ||
1271 | if (child->stopped_by_watchpoint) | |
1272 | { | |
1273 | if (the_low_target.stopped_data_address != NULL) | |
1274 | child->stopped_data_address | |
1275 | = the_low_target.stopped_data_address (); | |
1276 | else | |
1277 | child->stopped_data_address = 0; | |
1278 | } | |
1279 | ||
1280 | current_inferior = saved_inferior; | |
1281 | } | |
1282 | } | |
1283 | ||
d50171e4 PA |
1284 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1285 | architecture being defined already (so that CHILD has a valid | |
1286 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1287 | not). */ | |
1288 | if (WIFSTOPPED (*wstatp)) | |
1289 | child->stop_pc = get_stop_pc (child); | |
1290 | ||
0d62e5e8 | 1291 | if (debug_threads |
47c0c975 DE |
1292 | && WIFSTOPPED (*wstatp) |
1293 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1294 | { |
896c7fbb | 1295 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1296 | struct regcache *regcache; |
47c0c975 DE |
1297 | CORE_ADDR pc; |
1298 | ||
d50171e4 | 1299 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1300 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1301 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1302 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1303 | current_inferior = saved_inferior; |
0d62e5e8 | 1304 | } |
bd99dc85 PA |
1305 | |
1306 | return child; | |
0d62e5e8 | 1307 | } |
611cb4a5 | 1308 | |
219f2f23 PA |
1309 | /* This function should only be called if the LWP got a SIGTRAP. |
1310 | ||
1311 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1312 | event was handled, 0 otherwise. */ | |
1313 | ||
1314 | static int | |
1315 | handle_tracepoints (struct lwp_info *lwp) | |
1316 | { | |
1317 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1318 | int tpoint_related_event = 0; | |
1319 | ||
7984d532 PA |
1320 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1321 | uninsert tracepoints. To do this, we temporarily pause all | |
1322 | threads, unpatch away, and then unpause threads. We need to make | |
1323 | sure the unpausing doesn't resume LWP too. */ | |
1324 | lwp->suspended++; | |
1325 | ||
219f2f23 PA |
1326 | /* And we need to be sure that any all-threads-stopping doesn't try |
1327 | to move threads out of the jump pads, as it could deadlock the | |
1328 | inferior (LWP could be in the jump pad, maybe even holding the | |
1329 | lock.) */ | |
1330 | ||
1331 | /* Do any necessary step collect actions. */ | |
1332 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1333 | ||
fa593d66 PA |
1334 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1335 | ||
219f2f23 PA |
1336 | /* See if we just hit a tracepoint and do its main collect |
1337 | actions. */ | |
1338 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1339 | ||
7984d532 PA |
1340 | lwp->suspended--; |
1341 | ||
1342 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1343 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1344 | |
219f2f23 PA |
1345 | if (tpoint_related_event) |
1346 | { | |
1347 | if (debug_threads) | |
1348 | fprintf (stderr, "got a tracepoint event\n"); | |
1349 | return 1; | |
1350 | } | |
1351 | ||
1352 | return 0; | |
1353 | } | |
1354 | ||
fa593d66 PA |
1355 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1356 | fast tracepoint. */ | |
1357 | ||
1358 | static int | |
1359 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1360 | struct fast_tpoint_collect_status *status) | |
1361 | { | |
1362 | CORE_ADDR thread_area; | |
1363 | ||
1364 | if (the_low_target.get_thread_area == NULL) | |
1365 | return 0; | |
1366 | ||
1367 | /* Get the thread area address. This is used to recognize which | |
1368 | thread is which when tracing with the in-process agent library. | |
1369 | We don't read anything from the address, and treat it as opaque; | |
1370 | it's the address itself that we assume is unique per-thread. */ | |
1371 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1372 | return 0; | |
1373 | ||
1374 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1375 | } | |
1376 | ||
1377 | /* The reason we resume in the caller, is because we want to be able | |
1378 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1379 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1380 | refuses to resume. */ | |
1381 | ||
1382 | static int | |
1383 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1384 | { | |
1385 | struct thread_info *saved_inferior; | |
1386 | ||
1387 | saved_inferior = current_inferior; | |
1388 | current_inferior = get_lwp_thread (lwp); | |
1389 | ||
1390 | if ((wstat == NULL | |
1391 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1392 | && supports_fast_tracepoints () | |
1393 | && in_process_agent_loaded ()) | |
1394 | { | |
1395 | struct fast_tpoint_collect_status status; | |
1396 | int r; | |
1397 | ||
1398 | if (debug_threads) | |
1399 | fprintf (stderr, "\ | |
1400 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1401 | lwpid_of (lwp)); | |
1402 | ||
1403 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1404 | ||
1405 | if (wstat == NULL | |
1406 | || (WSTOPSIG (*wstat) != SIGILL | |
1407 | && WSTOPSIG (*wstat) != SIGFPE | |
1408 | && WSTOPSIG (*wstat) != SIGSEGV | |
1409 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1410 | { | |
1411 | lwp->collecting_fast_tracepoint = r; | |
1412 | ||
1413 | if (r != 0) | |
1414 | { | |
1415 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1416 | { | |
1417 | /* Haven't executed the original instruction yet. | |
1418 | Set breakpoint there, and wait till it's hit, | |
1419 | then single-step until exiting the jump pad. */ | |
1420 | lwp->exit_jump_pad_bkpt | |
1421 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1422 | } | |
1423 | ||
1424 | if (debug_threads) | |
1425 | fprintf (stderr, "\ | |
1426 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1427 | lwpid_of (lwp)); | |
0cccb683 | 1428 | current_inferior = saved_inferior; |
fa593d66 PA |
1429 | |
1430 | return 1; | |
1431 | } | |
1432 | } | |
1433 | else | |
1434 | { | |
1435 | /* If we get a synchronous signal while collecting, *and* | |
1436 | while executing the (relocated) original instruction, | |
1437 | reset the PC to point at the tpoint address, before | |
1438 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1439 | report the signal to GDB, and pray for the best. */ | |
1440 | ||
1441 | lwp->collecting_fast_tracepoint = 0; | |
1442 | ||
1443 | if (r != 0 | |
1444 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1445 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1446 | { | |
1447 | siginfo_t info; | |
1448 | struct regcache *regcache; | |
1449 | ||
1450 | /* The si_addr on a few signals references the address | |
1451 | of the faulting instruction. Adjust that as | |
1452 | well. */ | |
1453 | if ((WSTOPSIG (*wstat) == SIGILL | |
1454 | || WSTOPSIG (*wstat) == SIGFPE | |
1455 | || WSTOPSIG (*wstat) == SIGBUS | |
1456 | || WSTOPSIG (*wstat) == SIGSEGV) | |
1457 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &info) == 0 | |
1458 | /* Final check just to make sure we don't clobber | |
1459 | the siginfo of non-kernel-sent signals. */ | |
1460 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1461 | { | |
1462 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
1463 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &info); | |
1464 | } | |
1465 | ||
1466 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1467 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1468 | lwp->stop_pc = status.tpoint_addr; | |
1469 | ||
1470 | /* Cancel any fast tracepoint lock this thread was | |
1471 | holding. */ | |
1472 | force_unlock_trace_buffer (); | |
1473 | } | |
1474 | ||
1475 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1476 | { | |
1477 | if (debug_threads) | |
1478 | fprintf (stderr, | |
1479 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1480 | "stopping all threads momentarily.\n"); | |
1481 | ||
1482 | stop_all_lwps (1, lwp); | |
1483 | cancel_breakpoints (); | |
1484 | ||
1485 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1486 | lwp->exit_jump_pad_bkpt = NULL; | |
1487 | ||
1488 | unstop_all_lwps (1, lwp); | |
1489 | ||
1490 | gdb_assert (lwp->suspended >= 0); | |
1491 | } | |
1492 | } | |
1493 | } | |
1494 | ||
1495 | if (debug_threads) | |
1496 | fprintf (stderr, "\ | |
1497 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1498 | lwpid_of (lwp)); | |
0cccb683 YQ |
1499 | |
1500 | current_inferior = saved_inferior; | |
fa593d66 PA |
1501 | return 0; |
1502 | } | |
1503 | ||
1504 | /* Enqueue one signal in the "signals to report later when out of the | |
1505 | jump pad" list. */ | |
1506 | ||
1507 | static void | |
1508 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1509 | { | |
1510 | struct pending_signals *p_sig; | |
1511 | ||
1512 | if (debug_threads) | |
1513 | fprintf (stderr, "\ | |
1514 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1515 | ||
1516 | if (debug_threads) | |
1517 | { | |
1518 | struct pending_signals *sig; | |
1519 | ||
1520 | for (sig = lwp->pending_signals_to_report; | |
1521 | sig != NULL; | |
1522 | sig = sig->prev) | |
1523 | fprintf (stderr, | |
1524 | " Already queued %d\n", | |
1525 | sig->signal); | |
1526 | ||
1527 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1528 | } | |
1529 | ||
1a981360 PA |
1530 | /* Don't enqueue non-RT signals if they are already in the deferred |
1531 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1532 | twice) */ | |
1533 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1534 | { | |
1535 | struct pending_signals *sig; | |
1536 | ||
1537 | for (sig = lwp->pending_signals_to_report; | |
1538 | sig != NULL; | |
1539 | sig = sig->prev) | |
1540 | { | |
1541 | if (sig->signal == WSTOPSIG (*wstat)) | |
1542 | { | |
1543 | if (debug_threads) | |
1544 | fprintf (stderr, | |
1545 | "Not requeuing already queued non-RT signal %d" | |
1546 | " for LWP %ld\n", | |
1547 | sig->signal, | |
1548 | lwpid_of (lwp)); | |
1549 | return; | |
1550 | } | |
1551 | } | |
1552 | } | |
1553 | ||
fa593d66 PA |
1554 | p_sig = xmalloc (sizeof (*p_sig)); |
1555 | p_sig->prev = lwp->pending_signals_to_report; | |
1556 | p_sig->signal = WSTOPSIG (*wstat); | |
1557 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1558 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1559 | ||
1560 | lwp->pending_signals_to_report = p_sig; | |
1561 | } | |
1562 | ||
1563 | /* Dequeue one signal from the "signals to report later when out of | |
1564 | the jump pad" list. */ | |
1565 | ||
1566 | static int | |
1567 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1568 | { | |
1569 | if (lwp->pending_signals_to_report != NULL) | |
1570 | { | |
1571 | struct pending_signals **p_sig; | |
1572 | ||
1573 | p_sig = &lwp->pending_signals_to_report; | |
1574 | while ((*p_sig)->prev != NULL) | |
1575 | p_sig = &(*p_sig)->prev; | |
1576 | ||
1577 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1578 | if ((*p_sig)->info.si_signo != 0) | |
1579 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); | |
1580 | free (*p_sig); | |
1581 | *p_sig = NULL; | |
1582 | ||
1583 | if (debug_threads) | |
1584 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1585 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1586 | ||
1587 | if (debug_threads) | |
1588 | { | |
1589 | struct pending_signals *sig; | |
1590 | ||
1591 | for (sig = lwp->pending_signals_to_report; | |
1592 | sig != NULL; | |
1593 | sig = sig->prev) | |
1594 | fprintf (stderr, | |
1595 | " Still queued %d\n", | |
1596 | sig->signal); | |
1597 | ||
1598 | fprintf (stderr, " (no more queued signals)\n"); | |
1599 | } | |
1600 | ||
1601 | return 1; | |
1602 | } | |
1603 | ||
1604 | return 0; | |
1605 | } | |
1606 | ||
d50171e4 PA |
1607 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1608 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1609 | will handle the current event, eventually we will resume this LWP, | |
1610 | and this breakpoint will trap again. */ | |
1611 | ||
1612 | static int | |
1613 | cancel_breakpoint (struct lwp_info *lwp) | |
1614 | { | |
1615 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1616 | |
1617 | /* There's nothing to do if we don't support breakpoints. */ | |
1618 | if (!supports_breakpoints ()) | |
1619 | return 0; | |
1620 | ||
d50171e4 PA |
1621 | /* breakpoint_at reads from current inferior. */ |
1622 | saved_inferior = current_inferior; | |
1623 | current_inferior = get_lwp_thread (lwp); | |
1624 | ||
1625 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1626 | { | |
1627 | if (debug_threads) | |
1628 | fprintf (stderr, | |
1629 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1630 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1631 | |
1632 | /* Back up the PC if necessary. */ | |
1633 | if (the_low_target.decr_pc_after_break) | |
1634 | { | |
1635 | struct regcache *regcache | |
fc7238bb | 1636 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1637 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1638 | } | |
1639 | ||
1640 | current_inferior = saved_inferior; | |
1641 | return 1; | |
1642 | } | |
1643 | else | |
1644 | { | |
1645 | if (debug_threads) | |
1646 | fprintf (stderr, | |
1647 | "CB: No breakpoint found at %s for [%s]\n", | |
1648 | paddress (lwp->stop_pc), | |
fc7238bb | 1649 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1650 | } |
1651 | ||
1652 | current_inferior = saved_inferior; | |
1653 | return 0; | |
1654 | } | |
1655 | ||
1656 | /* When the event-loop is doing a step-over, this points at the thread | |
1657 | being stepped. */ | |
1658 | ptid_t step_over_bkpt; | |
1659 | ||
bd99dc85 PA |
1660 | /* Wait for an event from child PID. If PID is -1, wait for any |
1661 | child. Store the stop status through the status pointer WSTAT. | |
1662 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1663 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1664 | the stopped child otherwise. */ | |
1665 | ||
0d62e5e8 | 1666 | static int |
d8301ad1 | 1667 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1668 | { |
d50171e4 | 1669 | struct lwp_info *event_child, *requested_child; |
d8301ad1 | 1670 | ptid_t wait_ptid; |
d50171e4 | 1671 | |
d50171e4 PA |
1672 | event_child = NULL; |
1673 | requested_child = NULL; | |
0d62e5e8 | 1674 | |
95954743 | 1675 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1676 | |
e825046f | 1677 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
0d62e5e8 | 1678 | { |
54a0b537 | 1679 | event_child = (struct lwp_info *) |
d50171e4 | 1680 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1681 | if (debug_threads && event_child) |
bd99dc85 | 1682 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1683 | } |
1684 | else | |
1685 | { | |
95954743 | 1686 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1687 | |
fa593d66 PA |
1688 | if (!stopping_threads |
1689 | && requested_child->status_pending_p | |
1690 | && requested_child->collecting_fast_tracepoint) | |
1691 | { | |
1692 | enqueue_one_deferred_signal (requested_child, | |
1693 | &requested_child->status_pending); | |
1694 | requested_child->status_pending_p = 0; | |
1695 | requested_child->status_pending = 0; | |
1696 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1697 | } | |
1698 | ||
1699 | if (requested_child->suspended | |
1700 | && requested_child->status_pending_p) | |
1701 | fatal ("requesting an event out of a suspended child?"); | |
1702 | ||
d50171e4 | 1703 | if (requested_child->status_pending_p) |
bd99dc85 | 1704 | event_child = requested_child; |
0d62e5e8 | 1705 | } |
611cb4a5 | 1706 | |
0d62e5e8 DJ |
1707 | if (event_child != NULL) |
1708 | { | |
bd99dc85 PA |
1709 | if (debug_threads) |
1710 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1711 | lwpid_of (event_child), event_child->status_pending); | |
1712 | *wstat = event_child->status_pending; | |
1713 | event_child->status_pending_p = 0; | |
1714 | event_child->status_pending = 0; | |
1715 | current_inferior = get_lwp_thread (event_child); | |
1716 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1717 | } |
1718 | ||
d8301ad1 JK |
1719 | if (ptid_is_pid (ptid)) |
1720 | { | |
1721 | /* A request to wait for a specific tgid. This is not possible | |
1722 | with waitpid, so instead, we wait for any child, and leave | |
1723 | children we're not interested in right now with a pending | |
1724 | status to report later. */ | |
1725 | wait_ptid = minus_one_ptid; | |
1726 | } | |
1727 | else | |
1728 | wait_ptid = ptid; | |
1729 | ||
0d62e5e8 DJ |
1730 | /* We only enter this loop if no process has a pending wait status. Thus |
1731 | any action taken in response to a wait status inside this loop is | |
1732 | responding as soon as we detect the status, not after any pending | |
1733 | events. */ | |
1734 | while (1) | |
1735 | { | |
d8301ad1 | 1736 | event_child = linux_wait_for_lwp (wait_ptid, wstat, options); |
0d62e5e8 | 1737 | |
bd99dc85 | 1738 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1739 | { |
1740 | if (debug_threads) | |
1741 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1742 | return 0; | |
1743 | } | |
0d62e5e8 DJ |
1744 | |
1745 | if (event_child == NULL) | |
1746 | error ("event from unknown child"); | |
611cb4a5 | 1747 | |
d8301ad1 JK |
1748 | if (ptid_is_pid (ptid) |
1749 | && ptid_get_pid (ptid) != ptid_get_pid (ptid_of (event_child))) | |
1750 | { | |
1751 | if (! WIFSTOPPED (*wstat)) | |
1752 | mark_lwp_dead (event_child, *wstat); | |
1753 | else | |
1754 | { | |
1755 | event_child->status_pending_p = 1; | |
1756 | event_child->status_pending = *wstat; | |
1757 | } | |
1758 | continue; | |
1759 | } | |
1760 | ||
bd99dc85 | 1761 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1762 | |
89be2091 | 1763 | /* Check for thread exit. */ |
bd99dc85 | 1764 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1765 | { |
89be2091 | 1766 | if (debug_threads) |
95954743 | 1767 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1768 | |
1769 | /* If the last thread is exiting, just return. */ | |
95954743 | 1770 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1771 | { |
1772 | if (debug_threads) | |
95954743 PA |
1773 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1774 | lwpid_of (event_child)); | |
bd99dc85 PA |
1775 | return lwpid_of (event_child); |
1776 | } | |
89be2091 | 1777 | |
bd99dc85 PA |
1778 | if (!non_stop) |
1779 | { | |
1780 | current_inferior = (struct thread_info *) all_threads.head; | |
1781 | if (debug_threads) | |
1782 | fprintf (stderr, "Current inferior is now %ld\n", | |
1783 | lwpid_of (get_thread_lwp (current_inferior))); | |
1784 | } | |
1785 | else | |
1786 | { | |
1787 | current_inferior = NULL; | |
1788 | if (debug_threads) | |
1789 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1790 | } | |
89be2091 DJ |
1791 | |
1792 | /* If we were waiting for this particular child to do something... | |
1793 | well, it did something. */ | |
bd99dc85 | 1794 | if (requested_child != NULL) |
d50171e4 PA |
1795 | { |
1796 | int lwpid = lwpid_of (event_child); | |
1797 | ||
1798 | /* Cancel the step-over operation --- the thread that | |
1799 | started it is gone. */ | |
1800 | if (finish_step_over (event_child)) | |
7984d532 | 1801 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1802 | delete_lwp (event_child); |
1803 | return lwpid; | |
1804 | } | |
1805 | ||
1806 | delete_lwp (event_child); | |
89be2091 DJ |
1807 | |
1808 | /* Wait for a more interesting event. */ | |
1809 | continue; | |
1810 | } | |
1811 | ||
a6dbe5df PA |
1812 | if (event_child->must_set_ptrace_flags) |
1813 | { | |
1e7fc18c | 1814 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1815 | event_child->must_set_ptrace_flags = 0; |
1816 | } | |
1817 | ||
bd99dc85 PA |
1818 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1819 | && *wstat >> 16 != 0) | |
24a09b5f | 1820 | { |
bd99dc85 | 1821 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1822 | continue; |
1823 | } | |
1824 | ||
d50171e4 PA |
1825 | if (WIFSTOPPED (*wstat) |
1826 | && WSTOPSIG (*wstat) == SIGSTOP | |
1827 | && event_child->stop_expected) | |
1828 | { | |
1829 | int should_stop; | |
1830 | ||
1831 | if (debug_threads) | |
1832 | fprintf (stderr, "Expected stop.\n"); | |
1833 | event_child->stop_expected = 0; | |
1834 | ||
8336d594 | 1835 | should_stop = (current_inferior->last_resume_kind == resume_stop |
d50171e4 PA |
1836 | || stopping_threads); |
1837 | ||
1838 | if (!should_stop) | |
1839 | { | |
1840 | linux_resume_one_lwp (event_child, | |
1841 | event_child->stepping, 0, NULL); | |
1842 | continue; | |
1843 | } | |
1844 | } | |
1845 | ||
bd99dc85 | 1846 | return lwpid_of (event_child); |
611cb4a5 | 1847 | } |
0d62e5e8 | 1848 | |
611cb4a5 DJ |
1849 | /* NOTREACHED */ |
1850 | return 0; | |
1851 | } | |
1852 | ||
6bf5e0ba PA |
1853 | /* Count the LWP's that have had events. */ |
1854 | ||
1855 | static int | |
1856 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1857 | { | |
1858 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1859 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1860 | int *count = data; |
1861 | ||
1862 | gdb_assert (count != NULL); | |
1863 | ||
1864 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1865 | should be reported to GDB. */ | |
8336d594 PA |
1866 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1867 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
1868 | && lp->status_pending_p |
1869 | && WIFSTOPPED (lp->status_pending) | |
1870 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1871 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1872 | (*count)++; | |
1873 | ||
1874 | return 0; | |
1875 | } | |
1876 | ||
1877 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1878 | ||
1879 | static int | |
1880 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1881 | { | |
1882 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1883 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 1884 | |
8336d594 PA |
1885 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1886 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
1887 | && lp->status_pending_p) |
1888 | return 1; | |
1889 | else | |
1890 | return 0; | |
1891 | } | |
1892 | ||
1893 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1894 | reported to GDB. */ | |
1895 | ||
1896 | static int | |
1897 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1898 | { | |
1899 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1900 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1901 | int *selector = data; |
1902 | ||
1903 | gdb_assert (selector != NULL); | |
1904 | ||
1905 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
1906 | if (thread->last_resume_kind != resume_stop |
1907 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1908 | && lp->status_pending_p |
1909 | && WIFSTOPPED (lp->status_pending) | |
1910 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1911 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1912 | if ((*selector)-- == 0) | |
1913 | return 1; | |
1914 | ||
1915 | return 0; | |
1916 | } | |
1917 | ||
1918 | static int | |
1919 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
1920 | { | |
1921 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1922 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1923 | struct lwp_info *event_lp = data; |
1924 | ||
1925 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1926 | if (lp == event_lp) | |
1927 | return 0; | |
1928 | ||
1929 | /* If a LWP other than the LWP that we're reporting an event for has | |
1930 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1931 | then just arrange for it to hit it again later. We don't keep | |
1932 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1933 | LWP. We will handle the current event, eventually we will resume | |
1934 | all LWPs, and this one will get its breakpoint trap again. | |
1935 | ||
1936 | If we do not do this, then we run the risk that the user will | |
1937 | delete or disable the breakpoint, but the LWP will have already | |
1938 | tripped on it. */ | |
1939 | ||
8336d594 PA |
1940 | if (thread->last_resume_kind != resume_stop |
1941 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1942 | && lp->status_pending_p |
1943 | && WIFSTOPPED (lp->status_pending) | |
1944 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
1945 | && !lp->stepping |
1946 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
1947 | && cancel_breakpoint (lp)) |
1948 | /* Throw away the SIGTRAP. */ | |
1949 | lp->status_pending_p = 0; | |
1950 | ||
1951 | return 0; | |
1952 | } | |
1953 | ||
7984d532 PA |
1954 | static void |
1955 | linux_cancel_breakpoints (void) | |
1956 | { | |
1957 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
1958 | } | |
1959 | ||
6bf5e0ba PA |
1960 | /* Select one LWP out of those that have events pending. */ |
1961 | ||
1962 | static void | |
1963 | select_event_lwp (struct lwp_info **orig_lp) | |
1964 | { | |
1965 | int num_events = 0; | |
1966 | int random_selector; | |
1967 | struct lwp_info *event_lp; | |
1968 | ||
1969 | /* Give preference to any LWP that is being single-stepped. */ | |
1970 | event_lp | |
1971 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1972 | select_singlestep_lwp_callback, NULL); | |
1973 | if (event_lp != NULL) | |
1974 | { | |
1975 | if (debug_threads) | |
1976 | fprintf (stderr, | |
1977 | "SEL: Select single-step %s\n", | |
1978 | target_pid_to_str (ptid_of (event_lp))); | |
1979 | } | |
1980 | else | |
1981 | { | |
1982 | /* No single-stepping LWP. Select one at random, out of those | |
1983 | which have had SIGTRAP events. */ | |
1984 | ||
1985 | /* First see how many SIGTRAP events we have. */ | |
1986 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
1987 | ||
1988 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1989 | random_selector = (int) | |
1990 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1991 | ||
1992 | if (debug_threads && num_events > 1) | |
1993 | fprintf (stderr, | |
1994 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1995 | num_events, random_selector); | |
1996 | ||
1997 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
1998 | select_event_lwp_callback, | |
1999 | &random_selector); | |
2000 | } | |
2001 | ||
2002 | if (event_lp != NULL) | |
2003 | { | |
2004 | /* Switch the event LWP. */ | |
2005 | *orig_lp = event_lp; | |
2006 | } | |
2007 | } | |
2008 | ||
7984d532 PA |
2009 | /* Decrement the suspend count of an LWP. */ |
2010 | ||
2011 | static int | |
2012 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2013 | { | |
2014 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2015 | ||
2016 | /* Ignore EXCEPT. */ | |
2017 | if (lwp == except) | |
2018 | return 0; | |
2019 | ||
2020 | lwp->suspended--; | |
2021 | ||
2022 | gdb_assert (lwp->suspended >= 0); | |
2023 | return 0; | |
2024 | } | |
2025 | ||
2026 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2027 | NULL. */ | |
2028 | ||
2029 | static void | |
2030 | unsuspend_all_lwps (struct lwp_info *except) | |
2031 | { | |
2032 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
2033 | } | |
2034 | ||
fa593d66 PA |
2035 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2036 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2037 | void *data); | |
2038 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2039 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2040 | struct target_waitstatus *ourstatus, | |
2041 | int target_options); | |
2042 | ||
2043 | /* Stabilize threads (move out of jump pads). | |
2044 | ||
2045 | If a thread is midway collecting a fast tracepoint, we need to | |
2046 | finish the collection and move it out of the jump pad before | |
2047 | reporting the signal. | |
2048 | ||
2049 | This avoids recursion while collecting (when a signal arrives | |
2050 | midway, and the signal handler itself collects), which would trash | |
2051 | the trace buffer. In case the user set a breakpoint in a signal | |
2052 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2053 | Most importantly, there are certain things we can't do safely if | |
2054 | threads are stopped in a jump pad (or in its callee's). For | |
2055 | example: | |
2056 | ||
2057 | - starting a new trace run. A thread still collecting the | |
2058 | previous run, could trash the trace buffer when resumed. The trace | |
2059 | buffer control structures would have been reset but the thread had | |
2060 | no way to tell. The thread could even midway memcpy'ing to the | |
2061 | buffer, which would mean that when resumed, it would clobber the | |
2062 | trace buffer that had been set for a new run. | |
2063 | ||
2064 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2065 | safely. Say you do tstart while a thread is stopped midway while | |
2066 | collecting. When the thread is later resumed, it finishes the | |
2067 | collection, and returns to the jump pad, to execute the original | |
2068 | instruction that was under the tracepoint jump at the time the | |
2069 | older run had been started. If the jump pad had been rewritten | |
2070 | since for something else in the new run, the thread would now | |
2071 | execute the wrong / random instructions. */ | |
2072 | ||
2073 | static void | |
2074 | linux_stabilize_threads (void) | |
2075 | { | |
2076 | struct thread_info *save_inferior; | |
2077 | struct lwp_info *lwp_stuck; | |
2078 | ||
2079 | lwp_stuck | |
2080 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2081 | stuck_in_jump_pad_callback, NULL); | |
2082 | if (lwp_stuck != NULL) | |
2083 | { | |
b4d51a55 PA |
2084 | if (debug_threads) |
2085 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
2086 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2087 | return; |
2088 | } | |
2089 | ||
2090 | save_inferior = current_inferior; | |
2091 | ||
2092 | stabilizing_threads = 1; | |
2093 | ||
2094 | /* Kick 'em all. */ | |
2095 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2096 | ||
2097 | /* Loop until all are stopped out of the jump pads. */ | |
2098 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2099 | { | |
2100 | struct target_waitstatus ourstatus; | |
2101 | struct lwp_info *lwp; | |
fa593d66 PA |
2102 | int wstat; |
2103 | ||
2104 | /* Note that we go through the full wait even loop. While | |
2105 | moving threads out of jump pad, we need to be able to step | |
2106 | over internal breakpoints and such. */ | |
32fcada3 | 2107 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2108 | |
2109 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2110 | { | |
2111 | lwp = get_thread_lwp (current_inferior); | |
2112 | ||
2113 | /* Lock it. */ | |
2114 | lwp->suspended++; | |
2115 | ||
2116 | if (ourstatus.value.sig != TARGET_SIGNAL_0 | |
2117 | || current_inferior->last_resume_kind == resume_stop) | |
2118 | { | |
2119 | wstat = W_STOPCODE (target_signal_to_host (ourstatus.value.sig)); | |
2120 | enqueue_one_deferred_signal (lwp, &wstat); | |
2121 | } | |
2122 | } | |
2123 | } | |
2124 | ||
2125 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2126 | ||
2127 | stabilizing_threads = 0; | |
2128 | ||
2129 | current_inferior = save_inferior; | |
2130 | ||
b4d51a55 | 2131 | if (debug_threads) |
fa593d66 | 2132 | { |
b4d51a55 PA |
2133 | lwp_stuck |
2134 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2135 | stuck_in_jump_pad_callback, NULL); | |
2136 | if (lwp_stuck != NULL) | |
fa593d66 PA |
2137 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2138 | lwpid_of (lwp_stuck)); | |
2139 | } | |
2140 | } | |
2141 | ||
0d62e5e8 | 2142 | /* Wait for process, returns status. */ |
da6d8c04 | 2143 | |
95954743 PA |
2144 | static ptid_t |
2145 | linux_wait_1 (ptid_t ptid, | |
2146 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2147 | { |
e5f1222d | 2148 | int w; |
fc7238bb | 2149 | struct lwp_info *event_child; |
bd99dc85 | 2150 | int options; |
bd99dc85 | 2151 | int pid; |
6bf5e0ba PA |
2152 | int step_over_finished; |
2153 | int bp_explains_trap; | |
2154 | int maybe_internal_trap; | |
2155 | int report_to_gdb; | |
219f2f23 | 2156 | int trace_event; |
bd99dc85 PA |
2157 | |
2158 | /* Translate generic target options into linux options. */ | |
2159 | options = __WALL; | |
2160 | if (target_options & TARGET_WNOHANG) | |
2161 | options |= WNOHANG; | |
0d62e5e8 DJ |
2162 | |
2163 | retry: | |
fa593d66 PA |
2164 | bp_explains_trap = 0; |
2165 | trace_event = 0; | |
bd99dc85 PA |
2166 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2167 | ||
0d62e5e8 DJ |
2168 | /* If we were only supposed to resume one thread, only wait for |
2169 | that thread - if it's still alive. If it died, however - which | |
2170 | can happen if we're coming from the thread death case below - | |
2171 | then we need to make sure we restart the other threads. We could | |
2172 | pick a thread at random or restart all; restarting all is less | |
2173 | arbitrary. */ | |
95954743 PA |
2174 | if (!non_stop |
2175 | && !ptid_equal (cont_thread, null_ptid) | |
2176 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2177 | { |
fc7238bb PA |
2178 | struct thread_info *thread; |
2179 | ||
bd99dc85 PA |
2180 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2181 | cont_thread); | |
0d62e5e8 DJ |
2182 | |
2183 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2184 | if (thread == NULL) |
64386c31 DJ |
2185 | { |
2186 | struct thread_resume resume_info; | |
95954743 | 2187 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2188 | resume_info.kind = resume_continue; |
2189 | resume_info.sig = 0; | |
2bd7c093 | 2190 | linux_resume (&resume_info, 1); |
64386c31 | 2191 | } |
bd99dc85 | 2192 | else |
95954743 | 2193 | ptid = cont_thread; |
0d62e5e8 | 2194 | } |
da6d8c04 | 2195 | |
6bf5e0ba PA |
2196 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2197 | pid = linux_wait_for_event (ptid, &w, options); | |
2198 | else | |
2199 | { | |
2200 | if (debug_threads) | |
2201 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2202 | target_pid_to_str (step_over_bkpt)); | |
2203 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2204 | } | |
2205 | ||
bd99dc85 | 2206 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2207 | return null_ptid; |
bd99dc85 | 2208 | |
6bf5e0ba | 2209 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2210 | |
0d62e5e8 DJ |
2211 | /* If we are waiting for a particular child, and it exited, |
2212 | linux_wait_for_event will return its exit status. Similarly if | |
2213 | the last child exited. If this is not the last child, however, | |
2214 | do not report it as exited until there is a 'thread exited' response | |
2215 | available in the remote protocol. Instead, just wait for another event. | |
2216 | This should be safe, because if the thread crashed we will already | |
2217 | have reported the termination signal to GDB; that should stop any | |
2218 | in-progress stepping operations, etc. | |
2219 | ||
2220 | Report the exit status of the last thread to exit. This matches | |
2221 | LinuxThreads' behavior. */ | |
2222 | ||
95954743 | 2223 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2224 | { |
bd99dc85 | 2225 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2226 | { |
bd99dc85 PA |
2227 | if (WIFEXITED (w)) |
2228 | { | |
2229 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2230 | ourstatus->value.integer = WEXITSTATUS (w); | |
2231 | ||
2232 | if (debug_threads) | |
493e2a69 MS |
2233 | fprintf (stderr, |
2234 | "\nChild exited with retcode = %x \n", | |
2235 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2236 | } |
2237 | else | |
2238 | { | |
2239 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2240 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
2241 | ||
2242 | if (debug_threads) | |
493e2a69 MS |
2243 | fprintf (stderr, |
2244 | "\nChild terminated with signal = %x \n", | |
2245 | WTERMSIG (w)); | |
bd99dc85 PA |
2246 | |
2247 | } | |
5b1c542e | 2248 | |
3e4c1235 | 2249 | return ptid_of (event_child); |
0d62e5e8 | 2250 | } |
da6d8c04 | 2251 | } |
0d62e5e8 | 2252 | else |
da6d8c04 | 2253 | { |
0d62e5e8 DJ |
2254 | if (!WIFSTOPPED (w)) |
2255 | goto retry; | |
da6d8c04 DJ |
2256 | } |
2257 | ||
6bf5e0ba PA |
2258 | /* If this event was not handled before, and is not a SIGTRAP, we |
2259 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2260 | a breakpoint is inserted at the current PC. If this target does | |
2261 | not support internal breakpoints at all, we also report the | |
2262 | SIGTRAP without further processing; it's of no concern to us. */ | |
2263 | maybe_internal_trap | |
2264 | = (supports_breakpoints () | |
2265 | && (WSTOPSIG (w) == SIGTRAP | |
2266 | || ((WSTOPSIG (w) == SIGILL | |
2267 | || WSTOPSIG (w) == SIGSEGV) | |
2268 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2269 | ||
2270 | if (maybe_internal_trap) | |
2271 | { | |
2272 | /* Handle anything that requires bookkeeping before deciding to | |
2273 | report the event or continue waiting. */ | |
2274 | ||
2275 | /* First check if we can explain the SIGTRAP with an internal | |
2276 | breakpoint, or if we should possibly report the event to GDB. | |
2277 | Do this before anything that may remove or insert a | |
2278 | breakpoint. */ | |
2279 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2280 | ||
2281 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2282 | finished. If so, tweak the state machine accordingly, | |
2283 | reinsert breakpoints and delete any reinsert (software | |
2284 | single-step) breakpoints. */ | |
2285 | step_over_finished = finish_step_over (event_child); | |
2286 | ||
2287 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2288 | check_breakpoints (event_child->stop_pc); | |
2289 | ||
219f2f23 PA |
2290 | /* Handle tracepoint data collecting. This may overflow the |
2291 | trace buffer, and cause a tracing stop, removing | |
2292 | breakpoints. */ | |
2293 | trace_event = handle_tracepoints (event_child); | |
2294 | ||
6bf5e0ba PA |
2295 | if (bp_explains_trap) |
2296 | { | |
2297 | /* If we stepped or ran into an internal breakpoint, we've | |
2298 | already handled it. So next time we resume (from this | |
2299 | PC), we should step over it. */ | |
2300 | if (debug_threads) | |
2301 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2302 | ||
8b07ae33 PA |
2303 | if (breakpoint_here (event_child->stop_pc)) |
2304 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2305 | } |
2306 | } | |
2307 | else | |
2308 | { | |
2309 | /* We have some other signal, possibly a step-over dance was in | |
2310 | progress, and it should be cancelled too. */ | |
2311 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2312 | } |
2313 | ||
2314 | /* We have all the data we need. Either report the event to GDB, or | |
2315 | resume threads and keep waiting for more. */ | |
2316 | ||
2317 | /* If we're collecting a fast tracepoint, finish the collection and | |
2318 | move out of the jump pad before delivering a signal. See | |
2319 | linux_stabilize_threads. */ | |
2320 | ||
2321 | if (WIFSTOPPED (w) | |
2322 | && WSTOPSIG (w) != SIGTRAP | |
2323 | && supports_fast_tracepoints () | |
2324 | && in_process_agent_loaded ()) | |
2325 | { | |
2326 | if (debug_threads) | |
2327 | fprintf (stderr, | |
2328 | "Got signal %d for LWP %ld. Check if we need " | |
2329 | "to defer or adjust it.\n", | |
2330 | WSTOPSIG (w), lwpid_of (event_child)); | |
2331 | ||
2332 | /* Allow debugging the jump pad itself. */ | |
2333 | if (current_inferior->last_resume_kind != resume_step | |
2334 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2335 | { | |
2336 | enqueue_one_deferred_signal (event_child, &w); | |
2337 | ||
2338 | if (debug_threads) | |
2339 | fprintf (stderr, | |
2340 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2341 | WSTOPSIG (w), lwpid_of (event_child)); | |
2342 | ||
2343 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2344 | goto retry; | |
2345 | } | |
2346 | } | |
219f2f23 | 2347 | |
fa593d66 PA |
2348 | if (event_child->collecting_fast_tracepoint) |
2349 | { | |
2350 | if (debug_threads) | |
2351 | fprintf (stderr, "\ | |
2352 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2353 | Check if we're already there.\n", | |
2354 | lwpid_of (event_child), | |
2355 | event_child->collecting_fast_tracepoint); | |
2356 | ||
2357 | trace_event = 1; | |
2358 | ||
2359 | event_child->collecting_fast_tracepoint | |
2360 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2361 | ||
2362 | if (event_child->collecting_fast_tracepoint != 1) | |
2363 | { | |
2364 | /* No longer need this breakpoint. */ | |
2365 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2366 | { | |
2367 | if (debug_threads) | |
2368 | fprintf (stderr, | |
2369 | "No longer need exit-jump-pad bkpt; removing it." | |
2370 | "stopping all threads momentarily.\n"); | |
2371 | ||
2372 | /* Other running threads could hit this breakpoint. | |
2373 | We don't handle moribund locations like GDB does, | |
2374 | instead we always pause all threads when removing | |
2375 | breakpoints, so that any step-over or | |
2376 | decr_pc_after_break adjustment is always taken | |
2377 | care of while the breakpoint is still | |
2378 | inserted. */ | |
2379 | stop_all_lwps (1, event_child); | |
2380 | cancel_breakpoints (); | |
2381 | ||
2382 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2383 | event_child->exit_jump_pad_bkpt = NULL; | |
2384 | ||
2385 | unstop_all_lwps (1, event_child); | |
2386 | ||
2387 | gdb_assert (event_child->suspended >= 0); | |
2388 | } | |
2389 | } | |
2390 | ||
2391 | if (event_child->collecting_fast_tracepoint == 0) | |
2392 | { | |
2393 | if (debug_threads) | |
2394 | fprintf (stderr, | |
2395 | "fast tracepoint finished " | |
2396 | "collecting successfully.\n"); | |
2397 | ||
2398 | /* We may have a deferred signal to report. */ | |
2399 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2400 | { | |
2401 | if (debug_threads) | |
2402 | fprintf (stderr, "dequeued one signal.\n"); | |
2403 | } | |
3c11dd79 | 2404 | else |
fa593d66 | 2405 | { |
3c11dd79 PA |
2406 | if (debug_threads) |
2407 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2408 | |
2409 | if (stabilizing_threads) | |
2410 | { | |
2411 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
2412 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2413 | return ptid_of (event_child); | |
2414 | } | |
2415 | } | |
2416 | } | |
6bf5e0ba PA |
2417 | } |
2418 | ||
e471f25b PA |
2419 | /* Check whether GDB would be interested in this event. */ |
2420 | ||
2421 | /* If GDB is not interested in this signal, don't stop other | |
2422 | threads, and don't report it to GDB. Just resume the inferior | |
2423 | right away. We do this for threading-related signals as well as | |
2424 | any that GDB specifically requested we ignore. But never ignore | |
2425 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2426 | stepping - they may require special handling to skip the signal | |
2427 | handler. */ | |
2428 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2429 | thread library? */ | |
2430 | if (WIFSTOPPED (w) | |
2431 | && current_inferior->last_resume_kind != resume_step | |
2432 | && ( | |
1a981360 | 2433 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2434 | (current_process ()->private->thread_db != NULL |
2435 | && (WSTOPSIG (w) == __SIGRTMIN | |
2436 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2437 | || | |
2438 | #endif | |
2439 | (pass_signals[target_signal_from_host (WSTOPSIG (w))] | |
2440 | && !(WSTOPSIG (w) == SIGSTOP | |
2441 | && current_inferior->last_resume_kind == resume_stop)))) | |
2442 | { | |
2443 | siginfo_t info, *info_p; | |
2444 | ||
2445 | if (debug_threads) | |
2446 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2447 | WSTOPSIG (w), lwpid_of (event_child)); | |
2448 | ||
2449 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) | |
2450 | info_p = &info; | |
2451 | else | |
2452 | info_p = NULL; | |
2453 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2454 | WSTOPSIG (w), info_p); | |
2455 | goto retry; | |
2456 | } | |
2457 | ||
2458 | /* If GDB wanted this thread to single step, we always want to | |
2459 | report the SIGTRAP, and let GDB handle it. Watchpoints should | |
2460 | always be reported. So should signals we can't explain. A | |
2461 | SIGTRAP we can't explain could be a GDB breakpoint --- we may or | |
2462 | not support Z0 breakpoints. If we do, we're be able to handle | |
2463 | GDB breakpoints on top of internal breakpoints, by handling the | |
2464 | internal breakpoint and still reporting the event to GDB. If we | |
2465 | don't, we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 2466 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 2467 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 2468 | || event_child->stopped_by_watchpoint |
493e2a69 MS |
2469 | || (!step_over_finished |
2470 | && !bp_explains_trap && !trace_event) | |
9f3a5c85 LM |
2471 | || (gdb_breakpoint_here (event_child->stop_pc) |
2472 | && gdb_condition_true_at_breakpoint (event_child->stop_pc))); | |
6bf5e0ba PA |
2473 | |
2474 | /* We found no reason GDB would want us to stop. We either hit one | |
2475 | of our own breakpoints, or finished an internal step GDB | |
2476 | shouldn't know about. */ | |
2477 | if (!report_to_gdb) | |
2478 | { | |
2479 | if (debug_threads) | |
2480 | { | |
2481 | if (bp_explains_trap) | |
2482 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2483 | if (step_over_finished) | |
2484 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2485 | if (trace_event) |
2486 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
2487 | } |
2488 | ||
2489 | /* We're not reporting this breakpoint to GDB, so apply the | |
2490 | decr_pc_after_break adjustment to the inferior's regcache | |
2491 | ourselves. */ | |
2492 | ||
2493 | if (the_low_target.set_pc != NULL) | |
2494 | { | |
2495 | struct regcache *regcache | |
2496 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2497 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2498 | } | |
2499 | ||
7984d532 PA |
2500 | /* We may have finished stepping over a breakpoint. If so, |
2501 | we've stopped and suspended all LWPs momentarily except the | |
2502 | stepping one. This is where we resume them all again. We're | |
2503 | going to keep waiting, so use proceed, which handles stepping | |
2504 | over the next breakpoint. */ | |
6bf5e0ba PA |
2505 | if (debug_threads) |
2506 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2507 | |
2508 | if (step_over_finished) | |
2509 | unsuspend_all_lwps (event_child); | |
2510 | ||
6bf5e0ba PA |
2511 | proceed_all_lwps (); |
2512 | goto retry; | |
2513 | } | |
2514 | ||
2515 | if (debug_threads) | |
2516 | { | |
8336d594 | 2517 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
2518 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
2519 | if (event_child->stopped_by_watchpoint) | |
2520 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2521 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2522 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2523 | if (debug_threads) |
2524 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2525 | } | |
2526 | ||
2527 | /* Alright, we're going to report a stop. */ | |
2528 | ||
fa593d66 | 2529 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2530 | { |
2531 | /* In all-stop, stop all threads. */ | |
7984d532 | 2532 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2533 | |
2534 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2535 | from among those that have had events. Giving equal priority | |
2536 | to all LWPs that have had events helps prevent | |
2537 | starvation. */ | |
2538 | if (ptid_equal (ptid, minus_one_ptid)) | |
2539 | { | |
2540 | event_child->status_pending_p = 1; | |
2541 | event_child->status_pending = w; | |
2542 | ||
2543 | select_event_lwp (&event_child); | |
2544 | ||
2545 | event_child->status_pending_p = 0; | |
2546 | w = event_child->status_pending; | |
2547 | } | |
2548 | ||
2549 | /* Now that we've selected our final event LWP, cancel any | |
2550 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2551 | See the comment in cancel_breakpoints_callback to find out | |
2552 | why. */ | |
2553 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 | 2554 | |
c03e6ccc YQ |
2555 | /* If we were going a step-over, all other threads but the stepping one |
2556 | had been paused in start_step_over, with their suspend counts | |
2557 | incremented. We don't want to do a full unstop/unpause, because we're | |
2558 | in all-stop mode (so we want threads stopped), but we still need to | |
2559 | unsuspend the other threads, to decrement their `suspended' count | |
2560 | back. */ | |
2561 | if (step_over_finished) | |
2562 | unsuspend_all_lwps (event_child); | |
2563 | ||
fa593d66 PA |
2564 | /* Stabilize threads (move out of jump pads). */ |
2565 | stabilize_threads (); | |
6bf5e0ba PA |
2566 | } |
2567 | else | |
2568 | { | |
2569 | /* If we just finished a step-over, then all threads had been | |
2570 | momentarily paused. In all-stop, that's fine, we want | |
2571 | threads stopped by now anyway. In non-stop, we need to | |
2572 | re-resume threads that GDB wanted to be running. */ | |
2573 | if (step_over_finished) | |
7984d532 | 2574 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2575 | } |
2576 | ||
5b1c542e | 2577 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2578 | |
8336d594 PA |
2579 | if (current_inferior->last_resume_kind == resume_stop |
2580 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2581 | { |
2582 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2583 | and it stopped cleanly, so report as SIG0. The use of | |
2584 | SIGSTOP is an implementation detail. */ | |
2585 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2586 | } | |
8336d594 PA |
2587 | else if (current_inferior->last_resume_kind == resume_stop |
2588 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2589 | { |
2590 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2591 | but, it stopped for other reasons. */ |
bd99dc85 PA |
2592 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
2593 | } | |
2594 | else | |
2595 | { | |
2596 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
2597 | } | |
2598 | ||
d50171e4 PA |
2599 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2600 | ||
bd99dc85 | 2601 | if (debug_threads) |
95954743 | 2602 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2603 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2604 | ourstatus->kind, |
2605 | ourstatus->value.sig); | |
2606 | ||
6bf5e0ba | 2607 | return ptid_of (event_child); |
bd99dc85 PA |
2608 | } |
2609 | ||
2610 | /* Get rid of any pending event in the pipe. */ | |
2611 | static void | |
2612 | async_file_flush (void) | |
2613 | { | |
2614 | int ret; | |
2615 | char buf; | |
2616 | ||
2617 | do | |
2618 | ret = read (linux_event_pipe[0], &buf, 1); | |
2619 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2620 | } | |
2621 | ||
2622 | /* Put something in the pipe, so the event loop wakes up. */ | |
2623 | static void | |
2624 | async_file_mark (void) | |
2625 | { | |
2626 | int ret; | |
2627 | ||
2628 | async_file_flush (); | |
2629 | ||
2630 | do | |
2631 | ret = write (linux_event_pipe[1], "+", 1); | |
2632 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2633 | ||
2634 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2635 | be awakened anyway. */ | |
2636 | } | |
2637 | ||
95954743 PA |
2638 | static ptid_t |
2639 | linux_wait (ptid_t ptid, | |
2640 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2641 | { |
95954743 | 2642 | ptid_t event_ptid; |
bd99dc85 PA |
2643 | |
2644 | if (debug_threads) | |
95954743 | 2645 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2646 | |
2647 | /* Flush the async file first. */ | |
2648 | if (target_is_async_p ()) | |
2649 | async_file_flush (); | |
2650 | ||
95954743 | 2651 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2652 | |
2653 | /* If at least one stop was reported, there may be more. A single | |
2654 | SIGCHLD can signal more than one child stop. */ | |
2655 | if (target_is_async_p () | |
2656 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2657 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2658 | async_file_mark (); |
2659 | ||
2660 | return event_ptid; | |
da6d8c04 DJ |
2661 | } |
2662 | ||
c5f62d5f | 2663 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2664 | |
2665 | static int | |
a1928bad | 2666 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2667 | { |
c5f62d5f DE |
2668 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2669 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2670 | |
c5f62d5f DE |
2671 | #ifdef __NR_tkill |
2672 | { | |
2673 | static int tkill_failed; | |
fd500816 | 2674 | |
c5f62d5f DE |
2675 | if (!tkill_failed) |
2676 | { | |
2677 | int ret; | |
2678 | ||
2679 | errno = 0; | |
2680 | ret = syscall (__NR_tkill, lwpid, signo); | |
2681 | if (errno != ENOSYS) | |
2682 | return ret; | |
2683 | tkill_failed = 1; | |
2684 | } | |
2685 | } | |
fd500816 DJ |
2686 | #endif |
2687 | ||
2688 | return kill (lwpid, signo); | |
2689 | } | |
2690 | ||
964e4306 PA |
2691 | void |
2692 | linux_stop_lwp (struct lwp_info *lwp) | |
2693 | { | |
2694 | send_sigstop (lwp); | |
2695 | } | |
2696 | ||
0d62e5e8 | 2697 | static void |
02fc4de7 | 2698 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2699 | { |
bd99dc85 | 2700 | int pid; |
0d62e5e8 | 2701 | |
bd99dc85 PA |
2702 | pid = lwpid_of (lwp); |
2703 | ||
0d62e5e8 DJ |
2704 | /* If we already have a pending stop signal for this process, don't |
2705 | send another. */ | |
54a0b537 | 2706 | if (lwp->stop_expected) |
0d62e5e8 | 2707 | { |
ae13219e | 2708 | if (debug_threads) |
bd99dc85 | 2709 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2710 | |
0d62e5e8 DJ |
2711 | return; |
2712 | } | |
2713 | ||
2714 | if (debug_threads) | |
bd99dc85 | 2715 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2716 | |
d50171e4 | 2717 | lwp->stop_expected = 1; |
bd99dc85 | 2718 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2719 | } |
2720 | ||
7984d532 PA |
2721 | static int |
2722 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2723 | { |
2724 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2725 | ||
7984d532 PA |
2726 | /* Ignore EXCEPT. */ |
2727 | if (lwp == except) | |
2728 | return 0; | |
2729 | ||
02fc4de7 | 2730 | if (lwp->stopped) |
7984d532 | 2731 | return 0; |
02fc4de7 PA |
2732 | |
2733 | send_sigstop (lwp); | |
7984d532 PA |
2734 | return 0; |
2735 | } | |
2736 | ||
2737 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2738 | yet. */ | |
2739 | static int | |
2740 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2741 | void *except) | |
2742 | { | |
2743 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2744 | ||
2745 | /* Ignore EXCEPT. */ | |
2746 | if (lwp == except) | |
2747 | return 0; | |
2748 | ||
2749 | lwp->suspended++; | |
2750 | ||
2751 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2752 | } |
2753 | ||
95954743 PA |
2754 | static void |
2755 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2756 | { | |
2757 | /* It's dead, really. */ | |
2758 | lwp->dead = 1; | |
2759 | ||
2760 | /* Store the exit status for later. */ | |
2761 | lwp->status_pending_p = 1; | |
2762 | lwp->status_pending = wstat; | |
2763 | ||
95954743 PA |
2764 | /* Prevent trying to stop it. */ |
2765 | lwp->stopped = 1; | |
2766 | ||
2767 | /* No further stops are expected from a dead lwp. */ | |
2768 | lwp->stop_expected = 0; | |
2769 | } | |
2770 | ||
0d62e5e8 DJ |
2771 | static void |
2772 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2773 | { | |
54a0b537 | 2774 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2775 | struct thread_info *saved_inferior; |
a1928bad | 2776 | int wstat; |
95954743 PA |
2777 | ptid_t saved_tid; |
2778 | ptid_t ptid; | |
d50171e4 | 2779 | int pid; |
0d62e5e8 | 2780 | |
54a0b537 | 2781 | if (lwp->stopped) |
d50171e4 PA |
2782 | { |
2783 | if (debug_threads) | |
2784 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2785 | lwpid_of (lwp)); | |
2786 | return; | |
2787 | } | |
0d62e5e8 DJ |
2788 | |
2789 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2790 | if (saved_inferior != NULL) |
2791 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2792 | else | |
95954743 | 2793 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2794 | |
95954743 | 2795 | ptid = lwp->head.id; |
bd99dc85 | 2796 | |
d50171e4 PA |
2797 | if (debug_threads) |
2798 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2799 | ||
2800 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2801 | |
2802 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2803 | and record the pending SIGSTOP. If the process exited, just | |
2804 | return. */ | |
d50171e4 | 2805 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2806 | { |
2807 | if (debug_threads) | |
d50171e4 PA |
2808 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2809 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2810 | |
d50171e4 | 2811 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2812 | { |
2813 | if (debug_threads) | |
d50171e4 PA |
2814 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2815 | lwpid_of (lwp), wstat); | |
2816 | ||
c35fafde PA |
2817 | lwp->status_pending_p = 1; |
2818 | lwp->status_pending = wstat; | |
2819 | } | |
0d62e5e8 | 2820 | } |
d50171e4 | 2821 | else |
95954743 PA |
2822 | { |
2823 | if (debug_threads) | |
d50171e4 | 2824 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2825 | |
d50171e4 PA |
2826 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2827 | if (lwp) | |
2828 | { | |
2829 | /* Leave this status pending for the next time we're able to | |
2830 | report it. In the mean time, we'll report this lwp as | |
2831 | dead to GDB, so GDB doesn't try to read registers and | |
2832 | memory from it. This can only happen if this was the | |
2833 | last thread of the process; otherwise, PID is removed | |
2834 | from the thread tables before linux_wait_for_event | |
2835 | returns. */ | |
2836 | mark_lwp_dead (lwp, wstat); | |
2837 | } | |
95954743 | 2838 | } |
0d62e5e8 | 2839 | |
bd99dc85 | 2840 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2841 | current_inferior = saved_inferior; |
2842 | else | |
2843 | { | |
2844 | if (debug_threads) | |
2845 | fprintf (stderr, "Previously current thread died.\n"); | |
2846 | ||
bd99dc85 PA |
2847 | if (non_stop) |
2848 | { | |
2849 | /* We can't change the current inferior behind GDB's back, | |
2850 | otherwise, a subsequent command may apply to the wrong | |
2851 | process. */ | |
2852 | current_inferior = NULL; | |
2853 | } | |
2854 | else | |
2855 | { | |
2856 | /* Set a valid thread as current. */ | |
2857 | set_desired_inferior (0); | |
2858 | } | |
0d62e5e8 DJ |
2859 | } |
2860 | } | |
2861 | ||
fa593d66 PA |
2862 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
2863 | move it out, because we need to report the stop event to GDB. For | |
2864 | example, if the user puts a breakpoint in the jump pad, it's | |
2865 | because she wants to debug it. */ | |
2866 | ||
2867 | static int | |
2868 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
2869 | { | |
2870 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2871 | struct thread_info *thread = get_lwp_thread (lwp); | |
2872 | ||
2873 | gdb_assert (lwp->suspended == 0); | |
2874 | gdb_assert (lwp->stopped); | |
2875 | ||
2876 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
2877 | return (supports_fast_tracepoints () | |
2878 | && in_process_agent_loaded () | |
2879 | && (gdb_breakpoint_here (lwp->stop_pc) | |
2880 | || lwp->stopped_by_watchpoint | |
2881 | || thread->last_resume_kind == resume_step) | |
2882 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
2883 | } | |
2884 | ||
2885 | static void | |
2886 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
2887 | { | |
2888 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2889 | struct thread_info *thread = get_lwp_thread (lwp); | |
2890 | int *wstat; | |
2891 | ||
2892 | gdb_assert (lwp->suspended == 0); | |
2893 | gdb_assert (lwp->stopped); | |
2894 | ||
2895 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
2896 | ||
2897 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
2898 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
2899 | && !lwp->stopped_by_watchpoint | |
2900 | && thread->last_resume_kind != resume_step | |
2901 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
2902 | { | |
2903 | if (debug_threads) | |
2904 | fprintf (stderr, | |
2905 | "LWP %ld needs stabilizing (in jump pad)\n", | |
2906 | lwpid_of (lwp)); | |
2907 | ||
2908 | if (wstat) | |
2909 | { | |
2910 | lwp->status_pending_p = 0; | |
2911 | enqueue_one_deferred_signal (lwp, wstat); | |
2912 | ||
2913 | if (debug_threads) | |
2914 | fprintf (stderr, | |
2915 | "Signal %d for LWP %ld deferred " | |
2916 | "(in jump pad)\n", | |
2917 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
2918 | } | |
2919 | ||
2920 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
2921 | } | |
2922 | else | |
2923 | lwp->suspended++; | |
2924 | } | |
2925 | ||
2926 | static int | |
2927 | lwp_running (struct inferior_list_entry *entry, void *data) | |
2928 | { | |
2929 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2930 | ||
2931 | if (lwp->dead) | |
2932 | return 0; | |
2933 | if (lwp->stopped) | |
2934 | return 0; | |
2935 | return 1; | |
2936 | } | |
2937 | ||
7984d532 PA |
2938 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
2939 | If SUSPEND, then also increase the suspend count of every LWP, | |
2940 | except EXCEPT. */ | |
2941 | ||
0d62e5e8 | 2942 | static void |
7984d532 | 2943 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 DJ |
2944 | { |
2945 | stopping_threads = 1; | |
7984d532 PA |
2946 | |
2947 | if (suspend) | |
2948 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
2949 | else | |
2950 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 2951 | for_each_inferior (&all_lwps, wait_for_sigstop); |
0d62e5e8 DJ |
2952 | stopping_threads = 0; |
2953 | } | |
2954 | ||
da6d8c04 DJ |
2955 | /* Resume execution of the inferior process. |
2956 | If STEP is nonzero, single-step it. | |
2957 | If SIGNAL is nonzero, give it that signal. */ | |
2958 | ||
ce3a066d | 2959 | static void |
2acc282a | 2960 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 2961 | int step, int signal, siginfo_t *info) |
da6d8c04 | 2962 | { |
0d62e5e8 | 2963 | struct thread_info *saved_inferior; |
fa593d66 | 2964 | int fast_tp_collecting; |
0d62e5e8 | 2965 | |
54a0b537 | 2966 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
2967 | return; |
2968 | ||
fa593d66 PA |
2969 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
2970 | ||
2971 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
2972 | ||
219f2f23 PA |
2973 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
2974 | user used the "jump" command, or "set $pc = foo"). */ | |
2975 | if (lwp->stop_pc != get_pc (lwp)) | |
2976 | { | |
2977 | /* Collecting 'while-stepping' actions doesn't make sense | |
2978 | anymore. */ | |
2979 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
2980 | } | |
2981 | ||
0d62e5e8 DJ |
2982 | /* If we have pending signals or status, and a new signal, enqueue the |
2983 | signal. Also enqueue the signal if we are waiting to reinsert a | |
2984 | breakpoint; it will be picked up again below. */ | |
2985 | if (signal != 0 | |
fa593d66 PA |
2986 | && (lwp->status_pending_p |
2987 | || lwp->pending_signals != NULL | |
2988 | || lwp->bp_reinsert != 0 | |
2989 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
2990 | { |
2991 | struct pending_signals *p_sig; | |
bca929d3 | 2992 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 2993 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 2994 | p_sig->signal = signal; |
32ca6d61 DJ |
2995 | if (info == NULL) |
2996 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2997 | else | |
2998 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 2999 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3000 | } |
3001 | ||
d50171e4 PA |
3002 | if (lwp->status_pending_p) |
3003 | { | |
3004 | if (debug_threads) | |
3005 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
3006 | " has pending status\n", | |
3007 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
3008 | lwp->stop_expected ? "expected" : "not expected"); | |
3009 | return; | |
3010 | } | |
0d62e5e8 DJ |
3011 | |
3012 | saved_inferior = current_inferior; | |
54a0b537 | 3013 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
3014 | |
3015 | if (debug_threads) | |
1b3f6016 | 3016 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 3017 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 3018 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3019 | |
3020 | /* This bit needs some thinking about. If we get a signal that | |
3021 | we must report while a single-step reinsert is still pending, | |
3022 | we often end up resuming the thread. It might be better to | |
3023 | (ew) allow a stack of pending events; then we could be sure that | |
3024 | the reinsert happened right away and not lose any signals. | |
3025 | ||
3026 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3027 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3028 | complete correctness, so it won't solve that problem. It may be |
3029 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3030 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3031 | { |
3032 | if (debug_threads) | |
d50171e4 PA |
3033 | fprintf (stderr, " pending reinsert at 0x%s\n", |
3034 | paddress (lwp->bp_reinsert)); | |
3035 | ||
3036 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
3037 | { | |
fa593d66 PA |
3038 | if (fast_tp_collecting == 0) |
3039 | { | |
3040 | if (step == 0) | |
3041 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3042 | if (lwp->suspended) | |
3043 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3044 | lwp->suspended); | |
3045 | } | |
d50171e4 PA |
3046 | |
3047 | step = 1; | |
3048 | } | |
0d62e5e8 DJ |
3049 | |
3050 | /* Postpone any pending signal. It was enqueued above. */ | |
3051 | signal = 0; | |
3052 | } | |
3053 | ||
fa593d66 PA |
3054 | if (fast_tp_collecting == 1) |
3055 | { | |
3056 | if (debug_threads) | |
3057 | fprintf (stderr, "\ | |
3058 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
3059 | lwpid_of (lwp)); | |
3060 | ||
3061 | /* Postpone any pending signal. It was enqueued above. */ | |
3062 | signal = 0; | |
3063 | } | |
3064 | else if (fast_tp_collecting == 2) | |
3065 | { | |
3066 | if (debug_threads) | |
3067 | fprintf (stderr, "\ | |
3068 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
3069 | lwpid_of (lwp)); | |
3070 | ||
3071 | if (can_hardware_single_step ()) | |
3072 | step = 1; | |
3073 | else | |
3074 | fatal ("moving out of jump pad single-stepping" | |
3075 | " not implemented on this target"); | |
3076 | ||
3077 | /* Postpone any pending signal. It was enqueued above. */ | |
3078 | signal = 0; | |
3079 | } | |
3080 | ||
219f2f23 PA |
3081 | /* If we have while-stepping actions in this thread set it stepping. |
3082 | If we have a signal to deliver, it may or may not be set to | |
3083 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3084 | while-stepping into a signal handler. A possible smart thing to | |
3085 | do would be to set an internal breakpoint at the signal return | |
3086 | address, continue, and carry on catching this while-stepping | |
3087 | action only when that breakpoint is hit. A future | |
3088 | enhancement. */ | |
3089 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
3090 | && can_hardware_single_step ()) | |
3091 | { | |
3092 | if (debug_threads) | |
3093 | fprintf (stderr, | |
3094 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
3095 | lwpid_of (lwp)); | |
3096 | step = 1; | |
3097 | } | |
3098 | ||
aa691b87 | 3099 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3100 | { |
442ea881 PA |
3101 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3102 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 3103 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3104 | } |
3105 | ||
fa593d66 PA |
3106 | /* If we have pending signals, consume one unless we are trying to |
3107 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3108 | collect. */ | |
3109 | if (lwp->pending_signals != NULL | |
3110 | && lwp->bp_reinsert == 0 | |
3111 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3112 | { |
3113 | struct pending_signals **p_sig; | |
3114 | ||
54a0b537 | 3115 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3116 | while ((*p_sig)->prev != NULL) |
3117 | p_sig = &(*p_sig)->prev; | |
3118 | ||
3119 | signal = (*p_sig)->signal; | |
32ca6d61 | 3120 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 3121 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 3122 | |
0d62e5e8 DJ |
3123 | free (*p_sig); |
3124 | *p_sig = NULL; | |
3125 | } | |
3126 | ||
aa5ca48f DE |
3127 | if (the_low_target.prepare_to_resume != NULL) |
3128 | the_low_target.prepare_to_resume (lwp); | |
3129 | ||
0d62e5e8 | 3130 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 3131 | get_lwp_thread (lwp)); |
da6d8c04 | 3132 | errno = 0; |
54a0b537 | 3133 | lwp->stopped = 0; |
c3adc08c | 3134 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3135 | lwp->stepping = step; |
14ce3065 DE |
3136 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
3137 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3138 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3139 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
3140 | |
3141 | current_inferior = saved_inferior; | |
da6d8c04 | 3142 | if (errno) |
3221518c UW |
3143 | { |
3144 | /* ESRCH from ptrace either means that the thread was already | |
3145 | running (an error) or that it is gone (a race condition). If | |
3146 | it's gone, we will get a notification the next time we wait, | |
3147 | so we can ignore the error. We could differentiate these | |
3148 | two, but it's tricky without waiting; the thread still exists | |
3149 | as a zombie, so sending it signal 0 would succeed. So just | |
3150 | ignore ESRCH. */ | |
3151 | if (errno == ESRCH) | |
3152 | return; | |
3153 | ||
3154 | perror_with_name ("ptrace"); | |
3155 | } | |
da6d8c04 DJ |
3156 | } |
3157 | ||
2bd7c093 PA |
3158 | struct thread_resume_array |
3159 | { | |
3160 | struct thread_resume *resume; | |
3161 | size_t n; | |
3162 | }; | |
64386c31 DJ |
3163 | |
3164 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
3165 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
3166 | resume request. | |
3167 | ||
3168 | This algorithm is O(threads * resume elements), but resume elements | |
3169 | is small (and will remain small at least until GDB supports thread | |
3170 | suspension). */ | |
2bd7c093 PA |
3171 | static int |
3172 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3173 | { |
54a0b537 | 3174 | struct lwp_info *lwp; |
64386c31 | 3175 | struct thread_info *thread; |
5544ad89 | 3176 | int ndx; |
2bd7c093 | 3177 | struct thread_resume_array *r; |
64386c31 DJ |
3178 | |
3179 | thread = (struct thread_info *) entry; | |
54a0b537 | 3180 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3181 | r = arg; |
64386c31 | 3182 | |
2bd7c093 | 3183 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3184 | { |
3185 | ptid_t ptid = r->resume[ndx].thread; | |
3186 | if (ptid_equal (ptid, minus_one_ptid) | |
3187 | || ptid_equal (ptid, entry->id) | |
3188 | || (ptid_is_pid (ptid) | |
3189 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
3190 | || (ptid_get_lwp (ptid) == -1 | |
3191 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
3192 | { | |
d50171e4 | 3193 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3194 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3195 | { |
3196 | if (debug_threads) | |
3197 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3198 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3199 | ? "stopped" | |
3200 | : "stopping", | |
3201 | lwpid_of (lwp)); | |
3202 | ||
3203 | continue; | |
3204 | } | |
3205 | ||
95954743 | 3206 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3207 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 PA |
3208 | |
3209 | /* If we had a deferred signal to report, dequeue one now. | |
3210 | This can happen if LWP gets more than one signal while | |
3211 | trying to get out of a jump pad. */ | |
3212 | if (lwp->stopped | |
3213 | && !lwp->status_pending_p | |
3214 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3215 | { | |
3216 | lwp->status_pending_p = 1; | |
3217 | ||
3218 | if (debug_threads) | |
3219 | fprintf (stderr, | |
3220 | "Dequeueing deferred signal %d for LWP %ld, " | |
3221 | "leaving status pending.\n", | |
3222 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3223 | } | |
3224 | ||
95954743 PA |
3225 | return 0; |
3226 | } | |
3227 | } | |
2bd7c093 PA |
3228 | |
3229 | /* No resume action for this thread. */ | |
3230 | lwp->resume = NULL; | |
64386c31 | 3231 | |
2bd7c093 | 3232 | return 0; |
5544ad89 DJ |
3233 | } |
3234 | ||
5544ad89 | 3235 | |
bd99dc85 PA |
3236 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3237 | static int | |
3238 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3239 | { |
bd99dc85 | 3240 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3241 | |
bd99dc85 PA |
3242 | /* LWPs which will not be resumed are not interesting, because |
3243 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3244 | if (lwp->resume == NULL) |
bd99dc85 | 3245 | return 0; |
64386c31 | 3246 | |
bd99dc85 | 3247 | if (lwp->status_pending_p) |
d50171e4 PA |
3248 | * (int *) flag_p = 1; |
3249 | ||
3250 | return 0; | |
3251 | } | |
3252 | ||
3253 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3254 | internal breakpoint that we need to step over. It assumes that any | |
3255 | required STOP_PC adjustment has already been propagated to the | |
3256 | inferior's regcache. */ | |
3257 | ||
3258 | static int | |
3259 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3260 | { | |
3261 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3262 | struct thread_info *thread; |
d50171e4 PA |
3263 | struct thread_info *saved_inferior; |
3264 | CORE_ADDR pc; | |
3265 | ||
3266 | /* LWPs which will not be resumed are not interesting, because we | |
3267 | might not wait for them next time through linux_wait. */ | |
3268 | ||
3269 | if (!lwp->stopped) | |
3270 | { | |
3271 | if (debug_threads) | |
3272 | fprintf (stderr, | |
3273 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3274 | lwpid_of (lwp)); | |
3275 | return 0; | |
3276 | } | |
3277 | ||
8336d594 PA |
3278 | thread = get_lwp_thread (lwp); |
3279 | ||
3280 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3281 | { |
3282 | if (debug_threads) | |
3283 | fprintf (stderr, | |
3284 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3285 | lwpid_of (lwp)); | |
3286 | return 0; | |
3287 | } | |
3288 | ||
7984d532 PA |
3289 | gdb_assert (lwp->suspended >= 0); |
3290 | ||
3291 | if (lwp->suspended) | |
3292 | { | |
3293 | if (debug_threads) | |
3294 | fprintf (stderr, | |
3295 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3296 | lwpid_of (lwp)); | |
3297 | return 0; | |
3298 | } | |
3299 | ||
d50171e4 PA |
3300 | if (!lwp->need_step_over) |
3301 | { | |
3302 | if (debug_threads) | |
3303 | fprintf (stderr, | |
3304 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3305 | } | |
5544ad89 | 3306 | |
bd99dc85 | 3307 | if (lwp->status_pending_p) |
d50171e4 PA |
3308 | { |
3309 | if (debug_threads) | |
3310 | fprintf (stderr, | |
3311 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3312 | lwpid_of (lwp)); | |
3313 | return 0; | |
3314 | } | |
3315 | ||
3316 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3317 | or we have. */ | |
3318 | pc = get_pc (lwp); | |
3319 | ||
3320 | /* If the PC has changed since we stopped, then don't do anything, | |
3321 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3322 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3323 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3324 | command, or poked thread's registers herself. */ | |
3325 | if (pc != lwp->stop_pc) | |
3326 | { | |
3327 | if (debug_threads) | |
3328 | fprintf (stderr, | |
3329 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3330 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3331 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3332 | ||
3333 | lwp->need_step_over = 0; | |
3334 | return 0; | |
3335 | } | |
3336 | ||
3337 | saved_inferior = current_inferior; | |
8336d594 | 3338 | current_inferior = thread; |
d50171e4 | 3339 | |
8b07ae33 | 3340 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3341 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3342 | { |
8b07ae33 | 3343 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3344 | though. If the condition is being evaluated on the target's side |
3345 | and it evaluate to false, step over this breakpoint as well. */ | |
3346 | if (gdb_breakpoint_here (pc) | |
3347 | && gdb_condition_true_at_breakpoint (pc)) | |
8b07ae33 PA |
3348 | { |
3349 | if (debug_threads) | |
3350 | fprintf (stderr, | |
3351 | "Need step over [LWP %ld]? yes, but found" | |
3352 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3353 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3354 | |
8b07ae33 PA |
3355 | current_inferior = saved_inferior; |
3356 | return 0; | |
3357 | } | |
3358 | else | |
3359 | { | |
3360 | if (debug_threads) | |
3361 | fprintf (stderr, | |
493e2a69 MS |
3362 | "Need step over [LWP %ld]? yes, " |
3363 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3364 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3365 | |
8b07ae33 PA |
3366 | /* We've found an lwp that needs stepping over --- return 1 so |
3367 | that find_inferior stops looking. */ | |
3368 | current_inferior = saved_inferior; | |
3369 | ||
3370 | /* If the step over is cancelled, this is set again. */ | |
3371 | lwp->need_step_over = 0; | |
3372 | return 1; | |
3373 | } | |
d50171e4 PA |
3374 | } |
3375 | ||
3376 | current_inferior = saved_inferior; | |
3377 | ||
3378 | if (debug_threads) | |
3379 | fprintf (stderr, | |
3380 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3381 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3382 | |
bd99dc85 | 3383 | return 0; |
5544ad89 DJ |
3384 | } |
3385 | ||
d50171e4 PA |
3386 | /* Start a step-over operation on LWP. When LWP stopped at a |
3387 | breakpoint, to make progress, we need to remove the breakpoint out | |
3388 | of the way. If we let other threads run while we do that, they may | |
3389 | pass by the breakpoint location and miss hitting it. To avoid | |
3390 | that, a step-over momentarily stops all threads while LWP is | |
3391 | single-stepped while the breakpoint is temporarily uninserted from | |
3392 | the inferior. When the single-step finishes, we reinsert the | |
3393 | breakpoint, and let all threads that are supposed to be running, | |
3394 | run again. | |
3395 | ||
3396 | On targets that don't support hardware single-step, we don't | |
3397 | currently support full software single-stepping. Instead, we only | |
3398 | support stepping over the thread event breakpoint, by asking the | |
3399 | low target where to place a reinsert breakpoint. Since this | |
3400 | routine assumes the breakpoint being stepped over is a thread event | |
3401 | breakpoint, it usually assumes the return address of the current | |
3402 | function is a good enough place to set the reinsert breakpoint. */ | |
3403 | ||
3404 | static int | |
3405 | start_step_over (struct lwp_info *lwp) | |
3406 | { | |
3407 | struct thread_info *saved_inferior; | |
3408 | CORE_ADDR pc; | |
3409 | int step; | |
3410 | ||
3411 | if (debug_threads) | |
3412 | fprintf (stderr, | |
3413 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3414 | lwpid_of (lwp)); | |
3415 | ||
7984d532 PA |
3416 | stop_all_lwps (1, lwp); |
3417 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3418 | |
3419 | if (debug_threads) | |
3420 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3421 | ||
3422 | /* Note, we should always reach here with an already adjusted PC, | |
3423 | either by GDB (if we're resuming due to GDB's request), or by our | |
3424 | caller, if we just finished handling an internal breakpoint GDB | |
3425 | shouldn't care about. */ | |
3426 | pc = get_pc (lwp); | |
3427 | ||
3428 | saved_inferior = current_inferior; | |
3429 | current_inferior = get_lwp_thread (lwp); | |
3430 | ||
3431 | lwp->bp_reinsert = pc; | |
3432 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3433 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3434 | |
3435 | if (can_hardware_single_step ()) | |
3436 | { | |
3437 | step = 1; | |
3438 | } | |
3439 | else | |
3440 | { | |
3441 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3442 | set_reinsert_breakpoint (raddr); | |
3443 | step = 0; | |
3444 | } | |
3445 | ||
3446 | current_inferior = saved_inferior; | |
3447 | ||
3448 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3449 | ||
3450 | /* Require next event from this LWP. */ | |
3451 | step_over_bkpt = lwp->head.id; | |
3452 | return 1; | |
3453 | } | |
3454 | ||
3455 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3456 | start_step_over, if still there, and delete any reinsert | |
3457 | breakpoints we've set, on non hardware single-step targets. */ | |
3458 | ||
3459 | static int | |
3460 | finish_step_over (struct lwp_info *lwp) | |
3461 | { | |
3462 | if (lwp->bp_reinsert != 0) | |
3463 | { | |
3464 | if (debug_threads) | |
3465 | fprintf (stderr, "Finished step over.\n"); | |
3466 | ||
3467 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3468 | may be no breakpoint to reinsert there by now. */ | |
3469 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3470 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3471 | |
3472 | lwp->bp_reinsert = 0; | |
3473 | ||
3474 | /* Delete any software-single-step reinsert breakpoints. No | |
3475 | longer needed. We don't have to worry about other threads | |
3476 | hitting this trap, and later not being able to explain it, | |
3477 | because we were stepping over a breakpoint, and we hold all | |
3478 | threads but LWP stopped while doing that. */ | |
3479 | if (!can_hardware_single_step ()) | |
3480 | delete_reinsert_breakpoints (); | |
3481 | ||
3482 | step_over_bkpt = null_ptid; | |
3483 | return 1; | |
3484 | } | |
3485 | else | |
3486 | return 0; | |
3487 | } | |
3488 | ||
5544ad89 DJ |
3489 | /* This function is called once per thread. We check the thread's resume |
3490 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3491 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3492 | |
bd99dc85 PA |
3493 | For threads which we aren't explicitly told otherwise, we preserve |
3494 | the stepping flag; this is used for stepping over gdbserver-placed | |
3495 | breakpoints. | |
3496 | ||
3497 | If pending_flags was set in any thread, we queue any needed | |
3498 | signals, since we won't actually resume. We already have a pending | |
3499 | event to report, so we don't need to preserve any step requests; | |
3500 | they should be re-issued if necessary. */ | |
3501 | ||
3502 | static int | |
3503 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3504 | { |
54a0b537 | 3505 | struct lwp_info *lwp; |
5544ad89 | 3506 | struct thread_info *thread; |
bd99dc85 | 3507 | int step; |
d50171e4 PA |
3508 | int leave_all_stopped = * (int *) arg; |
3509 | int leave_pending; | |
5544ad89 DJ |
3510 | |
3511 | thread = (struct thread_info *) entry; | |
54a0b537 | 3512 | lwp = get_thread_lwp (thread); |
5544ad89 | 3513 | |
2bd7c093 | 3514 | if (lwp->resume == NULL) |
bd99dc85 | 3515 | return 0; |
5544ad89 | 3516 | |
bd99dc85 | 3517 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3518 | { |
bd99dc85 | 3519 | if (debug_threads) |
d50171e4 | 3520 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3521 | |
3522 | if (!lwp->stopped) | |
3523 | { | |
3524 | if (debug_threads) | |
d50171e4 | 3525 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3526 | |
d50171e4 PA |
3527 | /* Stop the thread, and wait for the event asynchronously, |
3528 | through the event loop. */ | |
02fc4de7 | 3529 | send_sigstop (lwp); |
bd99dc85 PA |
3530 | } |
3531 | else | |
3532 | { | |
3533 | if (debug_threads) | |
d50171e4 PA |
3534 | fprintf (stderr, "already stopped LWP %ld\n", |
3535 | lwpid_of (lwp)); | |
3536 | ||
3537 | /* The LWP may have been stopped in an internal event that | |
3538 | was not meant to be notified back to GDB (e.g., gdbserver | |
3539 | breakpoint), so we should be reporting a stop event in | |
3540 | this case too. */ | |
3541 | ||
3542 | /* If the thread already has a pending SIGSTOP, this is a | |
3543 | no-op. Otherwise, something later will presumably resume | |
3544 | the thread and this will cause it to cancel any pending | |
3545 | operation, due to last_resume_kind == resume_stop. If | |
3546 | the thread already has a pending status to report, we | |
3547 | will still report it the next time we wait - see | |
3548 | status_pending_p_callback. */ | |
1a981360 PA |
3549 | |
3550 | /* If we already have a pending signal to report, then | |
3551 | there's no need to queue a SIGSTOP, as this means we're | |
3552 | midway through moving the LWP out of the jumppad, and we | |
3553 | will report the pending signal as soon as that is | |
3554 | finished. */ | |
3555 | if (lwp->pending_signals_to_report == NULL) | |
3556 | send_sigstop (lwp); | |
bd99dc85 | 3557 | } |
32ca6d61 | 3558 | |
bd99dc85 PA |
3559 | /* For stop requests, we're done. */ |
3560 | lwp->resume = NULL; | |
fc7238bb | 3561 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3562 | return 0; |
5544ad89 DJ |
3563 | } |
3564 | ||
bd99dc85 PA |
3565 | /* If this thread which is about to be resumed has a pending status, |
3566 | then don't resume any threads - we can just report the pending | |
3567 | status. Make sure to queue any signals that would otherwise be | |
3568 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3569 | thread has a pending status. If there's a thread that needs the |
3570 | step-over-breakpoint dance, then don't resume any other thread | |
3571 | but that particular one. */ | |
3572 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3573 | |
d50171e4 | 3574 | if (!leave_pending) |
bd99dc85 PA |
3575 | { |
3576 | if (debug_threads) | |
3577 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3578 | |
d50171e4 | 3579 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3580 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3581 | } |
3582 | else | |
3583 | { | |
3584 | if (debug_threads) | |
3585 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3586 | |
bd99dc85 PA |
3587 | /* If we have a new signal, enqueue the signal. */ |
3588 | if (lwp->resume->sig != 0) | |
3589 | { | |
3590 | struct pending_signals *p_sig; | |
3591 | p_sig = xmalloc (sizeof (*p_sig)); | |
3592 | p_sig->prev = lwp->pending_signals; | |
3593 | p_sig->signal = lwp->resume->sig; | |
3594 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3595 | ||
3596 | /* If this is the same signal we were previously stopped by, | |
3597 | make sure to queue its siginfo. We can ignore the return | |
3598 | value of ptrace; if it fails, we'll skip | |
3599 | PTRACE_SETSIGINFO. */ | |
3600 | if (WIFSTOPPED (lwp->last_status) | |
3601 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
3602 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
3603 | ||
3604 | lwp->pending_signals = p_sig; | |
3605 | } | |
3606 | } | |
5544ad89 | 3607 | |
fc7238bb | 3608 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3609 | lwp->resume = NULL; |
5544ad89 | 3610 | return 0; |
0d62e5e8 DJ |
3611 | } |
3612 | ||
3613 | static void | |
2bd7c093 | 3614 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3615 | { |
2bd7c093 | 3616 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3617 | struct lwp_info *need_step_over = NULL; |
3618 | int any_pending; | |
3619 | int leave_all_stopped; | |
c6ecbae5 | 3620 | |
2bd7c093 | 3621 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3622 | |
d50171e4 PA |
3623 | /* If there is a thread which would otherwise be resumed, which has |
3624 | a pending status, then don't resume any threads - we can just | |
3625 | report the pending status. Make sure to queue any signals that | |
3626 | would otherwise be sent. In non-stop mode, we'll apply this | |
3627 | logic to each thread individually. We consume all pending events | |
3628 | before considering to start a step-over (in all-stop). */ | |
3629 | any_pending = 0; | |
bd99dc85 | 3630 | if (!non_stop) |
d50171e4 PA |
3631 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3632 | ||
3633 | /* If there is a thread which would otherwise be resumed, which is | |
3634 | stopped at a breakpoint that needs stepping over, then don't | |
3635 | resume any threads - have it step over the breakpoint with all | |
3636 | other threads stopped, then resume all threads again. Make sure | |
3637 | to queue any signals that would otherwise be delivered or | |
3638 | queued. */ | |
3639 | if (!any_pending && supports_breakpoints ()) | |
3640 | need_step_over | |
3641 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3642 | need_step_over_p, NULL); | |
3643 | ||
3644 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3645 | ||
3646 | if (debug_threads) | |
3647 | { | |
3648 | if (need_step_over != NULL) | |
3649 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3650 | else if (any_pending) | |
3651 | fprintf (stderr, | |
3652 | "Not resuming, all-stop and found " | |
3653 | "an LWP with pending status\n"); | |
3654 | else | |
3655 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3656 | } | |
3657 | ||
3658 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3659 | otherwise deliver. */ | |
3660 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3661 | ||
3662 | if (need_step_over) | |
3663 | start_step_over (need_step_over); | |
3664 | } | |
3665 | ||
3666 | /* This function is called once per thread. We check the thread's | |
3667 | last resume request, which will tell us whether to resume, step, or | |
3668 | leave the thread stopped. Any signal the client requested to be | |
3669 | delivered has already been enqueued at this point. | |
3670 | ||
3671 | If any thread that GDB wants running is stopped at an internal | |
3672 | breakpoint that needs stepping over, we start a step-over operation | |
3673 | on that particular thread, and leave all others stopped. */ | |
3674 | ||
7984d532 PA |
3675 | static int |
3676 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3677 | { |
7984d532 | 3678 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3679 | struct thread_info *thread; |
d50171e4 PA |
3680 | int step; |
3681 | ||
7984d532 PA |
3682 | if (lwp == except) |
3683 | return 0; | |
d50171e4 PA |
3684 | |
3685 | if (debug_threads) | |
3686 | fprintf (stderr, | |
3687 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3688 | ||
3689 | if (!lwp->stopped) | |
3690 | { | |
3691 | if (debug_threads) | |
3692 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3693 | return 0; |
d50171e4 PA |
3694 | } |
3695 | ||
8336d594 PA |
3696 | thread = get_lwp_thread (lwp); |
3697 | ||
02fc4de7 PA |
3698 | if (thread->last_resume_kind == resume_stop |
3699 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3700 | { |
3701 | if (debug_threads) | |
02fc4de7 PA |
3702 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3703 | lwpid_of (lwp)); | |
7984d532 | 3704 | return 0; |
d50171e4 PA |
3705 | } |
3706 | ||
3707 | if (lwp->status_pending_p) | |
3708 | { | |
3709 | if (debug_threads) | |
3710 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3711 | lwpid_of (lwp)); | |
7984d532 | 3712 | return 0; |
d50171e4 PA |
3713 | } |
3714 | ||
7984d532 PA |
3715 | gdb_assert (lwp->suspended >= 0); |
3716 | ||
d50171e4 PA |
3717 | if (lwp->suspended) |
3718 | { | |
3719 | if (debug_threads) | |
3720 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3721 | return 0; |
d50171e4 PA |
3722 | } |
3723 | ||
1a981360 PA |
3724 | if (thread->last_resume_kind == resume_stop |
3725 | && lwp->pending_signals_to_report == NULL | |
3726 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3727 | { |
3728 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3729 | last_status.kind check above would catch it, and we wouldn't | |
3730 | reach here. This LWP may have been momentarily paused by a | |
3731 | stop_all_lwps call while handling for example, another LWP's | |
3732 | step-over. In that case, the pending expected SIGSTOP signal | |
3733 | that was queued at vCont;t handling time will have already | |
3734 | been consumed by wait_for_sigstop, and so we need to requeue | |
3735 | another one here. Note that if the LWP already has a SIGSTOP | |
3736 | pending, this is a no-op. */ | |
3737 | ||
3738 | if (debug_threads) | |
3739 | fprintf (stderr, | |
3740 | "Client wants LWP %ld to stop. " | |
3741 | "Making sure it has a SIGSTOP pending\n", | |
3742 | lwpid_of (lwp)); | |
3743 | ||
3744 | send_sigstop (lwp); | |
3745 | } | |
3746 | ||
8336d594 | 3747 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3748 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3749 | return 0; |
3750 | } | |
3751 | ||
3752 | static int | |
3753 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3754 | { | |
3755 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3756 | ||
3757 | if (lwp == except) | |
3758 | return 0; | |
3759 | ||
3760 | lwp->suspended--; | |
3761 | gdb_assert (lwp->suspended >= 0); | |
3762 | ||
3763 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3764 | } |
3765 | ||
3766 | /* When we finish a step-over, set threads running again. If there's | |
3767 | another thread that may need a step-over, now's the time to start | |
3768 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3769 | ||
3770 | static void | |
3771 | proceed_all_lwps (void) | |
3772 | { | |
3773 | struct lwp_info *need_step_over; | |
3774 | ||
3775 | /* If there is a thread which would otherwise be resumed, which is | |
3776 | stopped at a breakpoint that needs stepping over, then don't | |
3777 | resume any threads - have it step over the breakpoint with all | |
3778 | other threads stopped, then resume all threads again. */ | |
3779 | ||
3780 | if (supports_breakpoints ()) | |
3781 | { | |
3782 | need_step_over | |
3783 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3784 | need_step_over_p, NULL); | |
3785 | ||
3786 | if (need_step_over != NULL) | |
3787 | { | |
3788 | if (debug_threads) | |
3789 | fprintf (stderr, "proceed_all_lwps: found " | |
3790 | "thread %ld needing a step-over\n", | |
3791 | lwpid_of (need_step_over)); | |
3792 | ||
3793 | start_step_over (need_step_over); | |
3794 | return; | |
3795 | } | |
3796 | } | |
5544ad89 | 3797 | |
d50171e4 PA |
3798 | if (debug_threads) |
3799 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3800 | ||
7984d532 | 3801 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3802 | } |
3803 | ||
3804 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3805 | pending statuses, are set to run again, except for EXCEPT, if not | |
3806 | NULL. This undoes a stop_all_lwps call. */ | |
3807 | ||
3808 | static void | |
7984d532 | 3809 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3810 | { |
5544ad89 DJ |
3811 | if (debug_threads) |
3812 | { | |
d50171e4 PA |
3813 | if (except) |
3814 | fprintf (stderr, | |
3815 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3816 | else |
d50171e4 PA |
3817 | fprintf (stderr, |
3818 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3819 | } |
3820 | ||
7984d532 PA |
3821 | if (unsuspend) |
3822 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3823 | else | |
3824 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3825 | } |
3826 | ||
58caa3dc DJ |
3827 | |
3828 | #ifdef HAVE_LINUX_REGSETS | |
3829 | ||
1faeff08 MR |
3830 | #define use_linux_regsets 1 |
3831 | ||
58caa3dc | 3832 | static int |
442ea881 | 3833 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3834 | { |
3835 | struct regset_info *regset; | |
e9d25b98 | 3836 | int saw_general_regs = 0; |
95954743 | 3837 | int pid; |
1570b33e | 3838 | struct iovec iov; |
58caa3dc DJ |
3839 | |
3840 | regset = target_regsets; | |
3841 | ||
95954743 | 3842 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3843 | while (regset->size >= 0) |
3844 | { | |
1570b33e L |
3845 | void *buf, *data; |
3846 | int nt_type, res; | |
58caa3dc | 3847 | |
52fa2412 | 3848 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3849 | { |
3850 | regset ++; | |
3851 | continue; | |
3852 | } | |
3853 | ||
bca929d3 | 3854 | buf = xmalloc (regset->size); |
1570b33e L |
3855 | |
3856 | nt_type = regset->nt_type; | |
3857 | if (nt_type) | |
3858 | { | |
3859 | iov.iov_base = buf; | |
3860 | iov.iov_len = regset->size; | |
3861 | data = (void *) &iov; | |
3862 | } | |
3863 | else | |
3864 | data = buf; | |
3865 | ||
dfb64f85 | 3866 | #ifndef __sparc__ |
1570b33e | 3867 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3868 | #else |
1570b33e | 3869 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 3870 | #endif |
58caa3dc DJ |
3871 | if (res < 0) |
3872 | { | |
3873 | if (errno == EIO) | |
3874 | { | |
52fa2412 UW |
3875 | /* If we get EIO on a regset, do not try it again for |
3876 | this process. */ | |
3877 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3878 | free (buf); |
52fa2412 | 3879 | continue; |
58caa3dc DJ |
3880 | } |
3881 | else | |
3882 | { | |
0d62e5e8 | 3883 | char s[256]; |
95954743 PA |
3884 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
3885 | pid); | |
0d62e5e8 | 3886 | perror (s); |
58caa3dc DJ |
3887 | } |
3888 | } | |
e9d25b98 DJ |
3889 | else if (regset->type == GENERAL_REGS) |
3890 | saw_general_regs = 1; | |
442ea881 | 3891 | regset->store_function (regcache, buf); |
58caa3dc | 3892 | regset ++; |
fdeb2a12 | 3893 | free (buf); |
58caa3dc | 3894 | } |
e9d25b98 DJ |
3895 | if (saw_general_regs) |
3896 | return 0; | |
3897 | else | |
3898 | return 1; | |
58caa3dc DJ |
3899 | } |
3900 | ||
3901 | static int | |
442ea881 | 3902 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3903 | { |
3904 | struct regset_info *regset; | |
e9d25b98 | 3905 | int saw_general_regs = 0; |
95954743 | 3906 | int pid; |
1570b33e | 3907 | struct iovec iov; |
58caa3dc DJ |
3908 | |
3909 | regset = target_regsets; | |
3910 | ||
95954743 | 3911 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3912 | while (regset->size >= 0) |
3913 | { | |
1570b33e L |
3914 | void *buf, *data; |
3915 | int nt_type, res; | |
58caa3dc | 3916 | |
52fa2412 | 3917 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3918 | { |
3919 | regset ++; | |
3920 | continue; | |
3921 | } | |
3922 | ||
bca929d3 | 3923 | buf = xmalloc (regset->size); |
545587ee DJ |
3924 | |
3925 | /* First fill the buffer with the current register set contents, | |
3926 | in case there are any items in the kernel's regset that are | |
3927 | not in gdbserver's regcache. */ | |
1570b33e L |
3928 | |
3929 | nt_type = regset->nt_type; | |
3930 | if (nt_type) | |
3931 | { | |
3932 | iov.iov_base = buf; | |
3933 | iov.iov_len = regset->size; | |
3934 | data = (void *) &iov; | |
3935 | } | |
3936 | else | |
3937 | data = buf; | |
3938 | ||
dfb64f85 | 3939 | #ifndef __sparc__ |
1570b33e | 3940 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3941 | #else |
1570b33e | 3942 | res = ptrace (regset->get_request, pid, &iov, data); |
dfb64f85 | 3943 | #endif |
545587ee DJ |
3944 | |
3945 | if (res == 0) | |
3946 | { | |
3947 | /* Then overlay our cached registers on that. */ | |
442ea881 | 3948 | regset->fill_function (regcache, buf); |
545587ee DJ |
3949 | |
3950 | /* Only now do we write the register set. */ | |
dfb64f85 | 3951 | #ifndef __sparc__ |
1570b33e | 3952 | res = ptrace (regset->set_request, pid, nt_type, data); |
dfb64f85 | 3953 | #else |
1570b33e | 3954 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 3955 | #endif |
545587ee DJ |
3956 | } |
3957 | ||
58caa3dc DJ |
3958 | if (res < 0) |
3959 | { | |
3960 | if (errno == EIO) | |
3961 | { | |
52fa2412 UW |
3962 | /* If we get EIO on a regset, do not try it again for |
3963 | this process. */ | |
3964 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3965 | free (buf); |
52fa2412 | 3966 | continue; |
58caa3dc | 3967 | } |
3221518c UW |
3968 | else if (errno == ESRCH) |
3969 | { | |
1b3f6016 PA |
3970 | /* At this point, ESRCH should mean the process is |
3971 | already gone, in which case we simply ignore attempts | |
3972 | to change its registers. See also the related | |
3973 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 3974 | free (buf); |
3221518c UW |
3975 | return 0; |
3976 | } | |
58caa3dc DJ |
3977 | else |
3978 | { | |
ce3a066d | 3979 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
3980 | } |
3981 | } | |
e9d25b98 DJ |
3982 | else if (regset->type == GENERAL_REGS) |
3983 | saw_general_regs = 1; | |
58caa3dc | 3984 | regset ++; |
09ec9b38 | 3985 | free (buf); |
58caa3dc | 3986 | } |
e9d25b98 DJ |
3987 | if (saw_general_regs) |
3988 | return 0; | |
3989 | else | |
3990 | return 1; | |
58caa3dc DJ |
3991 | } |
3992 | ||
1faeff08 | 3993 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 3994 | |
1faeff08 MR |
3995 | #define use_linux_regsets 0 |
3996 | #define regsets_fetch_inferior_registers(regcache) 1 | |
3997 | #define regsets_store_inferior_registers(regcache) 1 | |
58caa3dc | 3998 | |
58caa3dc | 3999 | #endif |
1faeff08 MR |
4000 | |
4001 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4002 | calls or 0 if it has to be transferred individually. */ | |
4003 | ||
4004 | static int | |
4005 | linux_register_in_regsets (int regno) | |
4006 | { | |
4007 | unsigned char mask = 1 << (regno % 8); | |
4008 | size_t index = regno / 8; | |
4009 | ||
4010 | return (use_linux_regsets | |
4011 | && (the_low_target.regset_bitmap == NULL | |
4012 | || (the_low_target.regset_bitmap[index] & mask) != 0)); | |
4013 | } | |
4014 | ||
58caa3dc | 4015 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4016 | |
4017 | int | |
4018 | register_addr (int regnum) | |
4019 | { | |
4020 | int addr; | |
4021 | ||
4022 | if (regnum < 0 || regnum >= the_low_target.num_regs) | |
4023 | error ("Invalid register number %d.", regnum); | |
4024 | ||
4025 | addr = the_low_target.regmap[regnum]; | |
4026 | ||
4027 | return addr; | |
4028 | } | |
4029 | ||
4030 | /* Fetch one register. */ | |
4031 | static void | |
4032 | fetch_register (struct regcache *regcache, int regno) | |
4033 | { | |
4034 | CORE_ADDR regaddr; | |
4035 | int i, size; | |
4036 | char *buf; | |
4037 | int pid; | |
4038 | ||
4039 | if (regno >= the_low_target.num_regs) | |
4040 | return; | |
4041 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4042 | return; | |
4043 | ||
4044 | regaddr = register_addr (regno); | |
4045 | if (regaddr == -1) | |
4046 | return; | |
4047 | ||
4048 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4049 | & -sizeof (PTRACE_XFER_TYPE)); | |
4050 | buf = alloca (size); | |
4051 | ||
4052 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4053 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4054 | { | |
4055 | errno = 0; | |
4056 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4057 | ptrace (PTRACE_PEEKUSER, pid, | |
4058 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4059 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
4060 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
4061 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4062 | if (errno != 0) | |
4063 | error ("reading register %d: %s", regno, strerror (errno)); | |
4064 | } | |
4065 | ||
4066 | if (the_low_target.supply_ptrace_register) | |
4067 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4068 | else | |
4069 | supply_register (regcache, regno, buf); | |
4070 | } | |
4071 | ||
4072 | /* Store one register. */ | |
4073 | static void | |
4074 | store_register (struct regcache *regcache, int regno) | |
4075 | { | |
4076 | CORE_ADDR regaddr; | |
4077 | int i, size; | |
4078 | char *buf; | |
4079 | int pid; | |
4080 | ||
4081 | if (regno >= the_low_target.num_regs) | |
4082 | return; | |
4083 | if ((*the_low_target.cannot_store_register) (regno)) | |
4084 | return; | |
4085 | ||
4086 | regaddr = register_addr (regno); | |
4087 | if (regaddr == -1) | |
4088 | return; | |
4089 | ||
4090 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4091 | & -sizeof (PTRACE_XFER_TYPE)); | |
4092 | buf = alloca (size); | |
4093 | memset (buf, 0, size); | |
4094 | ||
4095 | if (the_low_target.collect_ptrace_register) | |
4096 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4097 | else | |
4098 | collect_register (regcache, regno, buf); | |
4099 | ||
4100 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4101 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4102 | { | |
4103 | errno = 0; | |
4104 | ptrace (PTRACE_POKEUSER, pid, | |
4105 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4106 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4107 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
4108 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
4109 | if (errno != 0) | |
4110 | { | |
4111 | /* At this point, ESRCH should mean the process is | |
4112 | already gone, in which case we simply ignore attempts | |
4113 | to change its registers. See also the related | |
4114 | comment in linux_resume_one_lwp. */ | |
4115 | if (errno == ESRCH) | |
4116 | return; | |
4117 | ||
4118 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4119 | error ("writing register %d: %s", regno, strerror (errno)); | |
4120 | } | |
4121 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4122 | } | |
4123 | } | |
4124 | ||
4125 | /* Fetch all registers, or just one, from the child process. | |
4126 | If REGNO is -1, do this for all registers, skipping any that are | |
4127 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4128 | unless ALL is non-zero. | |
4129 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4130 | static void | |
4131 | usr_fetch_inferior_registers (struct regcache *regcache, int regno, int all) | |
4132 | { | |
4133 | if (regno == -1) | |
4134 | { | |
4135 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4136 | if (all || !linux_register_in_regsets (regno)) | |
4137 | fetch_register (regcache, regno); | |
4138 | } | |
4139 | else | |
4140 | fetch_register (regcache, regno); | |
4141 | } | |
4142 | ||
4143 | /* Store our register values back into the inferior. | |
4144 | If REGNO is -1, do this for all registers, skipping any that are | |
4145 | assumed to have been saved by regsets_store_inferior_registers, | |
4146 | unless ALL is non-zero. | |
4147 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4148 | static void | |
4149 | usr_store_inferior_registers (struct regcache *regcache, int regno, int all) | |
4150 | { | |
4151 | if (regno == -1) | |
4152 | { | |
4153 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4154 | if (all || !linux_register_in_regsets (regno)) | |
4155 | store_register (regcache, regno); | |
4156 | } | |
4157 | else | |
4158 | store_register (regcache, regno); | |
4159 | } | |
4160 | ||
4161 | #else /* !HAVE_LINUX_USRREGS */ | |
4162 | ||
4163 | #define usr_fetch_inferior_registers(regcache, regno, all) do {} while (0) | |
4164 | #define usr_store_inferior_registers(regcache, regno, all) do {} while (0) | |
4165 | ||
58caa3dc | 4166 | #endif |
1faeff08 MR |
4167 | |
4168 | ||
4169 | void | |
4170 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4171 | { | |
4172 | int use_regsets; | |
4173 | int all = 0; | |
4174 | ||
4175 | if (regno == -1) | |
4176 | { | |
4177 | all = regsets_fetch_inferior_registers (regcache); | |
4178 | usr_fetch_inferior_registers (regcache, regno, all); | |
4179 | } | |
4180 | else | |
4181 | { | |
4182 | use_regsets = linux_register_in_regsets (regno); | |
4183 | if (use_regsets) | |
4184 | all = regsets_fetch_inferior_registers (regcache); | |
4185 | if (!use_regsets || all) | |
4186 | usr_fetch_inferior_registers (regcache, regno, 1); | |
4187 | } | |
58caa3dc DJ |
4188 | } |
4189 | ||
4190 | void | |
442ea881 | 4191 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4192 | { |
1faeff08 MR |
4193 | int use_regsets; |
4194 | int all = 0; | |
4195 | ||
4196 | if (regno == -1) | |
4197 | { | |
4198 | all = regsets_store_inferior_registers (regcache); | |
4199 | usr_store_inferior_registers (regcache, regno, all); | |
4200 | } | |
4201 | else | |
4202 | { | |
4203 | use_regsets = linux_register_in_regsets (regno); | |
4204 | if (use_regsets) | |
4205 | all = regsets_store_inferior_registers (regcache); | |
4206 | if (!use_regsets || all) | |
4207 | usr_store_inferior_registers (regcache, regno, 1); | |
4208 | } | |
58caa3dc DJ |
4209 | } |
4210 | ||
da6d8c04 | 4211 | |
da6d8c04 DJ |
4212 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4213 | to debugger memory starting at MYADDR. */ | |
4214 | ||
c3e735a6 | 4215 | static int |
f450004a | 4216 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
4217 | { |
4218 | register int i; | |
4219 | /* Round starting address down to longword boundary. */ | |
4220 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4221 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
4222 | register int count |
4223 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
4224 | / sizeof (PTRACE_XFER_TYPE); |
4225 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 4226 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 4227 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
4228 | int fd; |
4229 | char filename[64]; | |
95954743 | 4230 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
4231 | |
4232 | /* Try using /proc. Don't bother for one word. */ | |
4233 | if (len >= 3 * sizeof (long)) | |
4234 | { | |
4235 | /* We could keep this file open and cache it - possibly one per | |
4236 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4237 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4238 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4239 | if (fd == -1) | |
4240 | goto no_proc; | |
4241 | ||
4242 | /* If pread64 is available, use it. It's faster if the kernel | |
4243 | supports it (only one syscall), and it's 64-bit safe even on | |
4244 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4245 | application). */ | |
4246 | #ifdef HAVE_PREAD64 | |
4247 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
4248 | #else | |
1de1badb | 4249 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
4250 | #endif |
4251 | { | |
4252 | close (fd); | |
4253 | goto no_proc; | |
4254 | } | |
4255 | ||
4256 | close (fd); | |
4257 | return 0; | |
4258 | } | |
da6d8c04 | 4259 | |
fd462a61 | 4260 | no_proc: |
da6d8c04 DJ |
4261 | /* Read all the longwords */ |
4262 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4263 | { | |
c3e735a6 | 4264 | errno = 0; |
14ce3065 DE |
4265 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4266 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4267 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
4268 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
4269 | if (errno) |
4270 | return errno; | |
da6d8c04 DJ |
4271 | } |
4272 | ||
4273 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
4274 | memcpy (myaddr, |
4275 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4276 | len); | |
c3e735a6 DJ |
4277 | |
4278 | return 0; | |
da6d8c04 DJ |
4279 | } |
4280 | ||
93ae6fdc PA |
4281 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4282 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
4283 | returns the value of errno. */ |
4284 | ||
ce3a066d | 4285 | static int |
f450004a | 4286 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4287 | { |
4288 | register int i; | |
4289 | /* Round starting address down to longword boundary. */ | |
4290 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4291 | /* Round ending address up; get number of longwords that makes. */ | |
4292 | register int count | |
493e2a69 MS |
4293 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4294 | / sizeof (PTRACE_XFER_TYPE); | |
4295 | ||
da6d8c04 | 4296 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4297 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4298 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4299 | ||
95954743 | 4300 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4301 | |
0d62e5e8 DJ |
4302 | if (debug_threads) |
4303 | { | |
58d6951d DJ |
4304 | /* Dump up to four bytes. */ |
4305 | unsigned int val = * (unsigned int *) myaddr; | |
4306 | if (len == 1) | |
4307 | val = val & 0xff; | |
4308 | else if (len == 2) | |
4309 | val = val & 0xffff; | |
4310 | else if (len == 3) | |
4311 | val = val & 0xffffff; | |
4312 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4313 | val, (long)memaddr); | |
0d62e5e8 DJ |
4314 | } |
4315 | ||
da6d8c04 DJ |
4316 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4317 | ||
93ae6fdc | 4318 | errno = 0; |
14ce3065 DE |
4319 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4320 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4321 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
4322 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
4323 | if (errno) |
4324 | return errno; | |
da6d8c04 DJ |
4325 | |
4326 | if (count > 1) | |
4327 | { | |
93ae6fdc | 4328 | errno = 0; |
da6d8c04 | 4329 | buffer[count - 1] |
95954743 | 4330 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4331 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4332 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4333 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4334 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 4335 | 0); |
93ae6fdc PA |
4336 | if (errno) |
4337 | return errno; | |
da6d8c04 DJ |
4338 | } |
4339 | ||
93ae6fdc | 4340 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4341 | |
493e2a69 MS |
4342 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4343 | myaddr, len); | |
da6d8c04 DJ |
4344 | |
4345 | /* Write the entire buffer. */ | |
4346 | ||
4347 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4348 | { | |
4349 | errno = 0; | |
14ce3065 DE |
4350 | ptrace (PTRACE_POKETEXT, pid, |
4351 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4352 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4353 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4354 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4355 | if (errno) |
4356 | return errno; | |
4357 | } | |
4358 | ||
4359 | return 0; | |
4360 | } | |
2f2893d9 | 4361 | |
6076632b | 4362 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4363 | static int linux_supports_tracefork_flag; |
4364 | ||
1e7fc18c PA |
4365 | static void |
4366 | linux_enable_event_reporting (int pid) | |
4367 | { | |
4368 | if (!linux_supports_tracefork_flag) | |
4369 | return; | |
4370 | ||
4371 | ptrace (PTRACE_SETOPTIONS, pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
4372 | } | |
4373 | ||
51c2684e | 4374 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4375 | |
51c2684e DJ |
4376 | static int |
4377 | linux_tracefork_grandchild (void *arg) | |
4378 | { | |
4379 | _exit (0); | |
4380 | } | |
4381 | ||
7407e2de AS |
4382 | #define STACK_SIZE 4096 |
4383 | ||
51c2684e DJ |
4384 | static int |
4385 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
4386 | { |
4387 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
4388 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
4389 | |
4390 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4391 | ||
4392 | if (fork () == 0) | |
4393 | linux_tracefork_grandchild (NULL); | |
4394 | ||
4395 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4396 | ||
7407e2de AS |
4397 | #ifdef __ia64__ |
4398 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4399 | CLONE_VM | SIGCHLD, NULL); | |
4400 | #else | |
a1f2ce7d | 4401 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4402 | CLONE_VM | SIGCHLD, NULL); |
4403 | #endif | |
e4b7f41c JK |
4404 | |
4405 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4406 | ||
24a09b5f DJ |
4407 | _exit (0); |
4408 | } | |
4409 | ||
24a09b5f DJ |
4410 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4411 | sure that we can enable the option, and that it had the desired | |
4412 | effect. */ | |
4413 | ||
4414 | static void | |
4415 | linux_test_for_tracefork (void) | |
4416 | { | |
4417 | int child_pid, ret, status; | |
4418 | long second_pid; | |
e4b7f41c | 4419 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4420 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4421 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4422 | |
4423 | linux_supports_tracefork_flag = 0; | |
4424 | ||
e4b7f41c JK |
4425 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4426 | ||
4427 | child_pid = fork (); | |
4428 | if (child_pid == 0) | |
4429 | linux_tracefork_child (NULL); | |
4430 | ||
4431 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4432 | ||
51c2684e | 4433 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4434 | #ifdef __ia64__ |
4435 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4436 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4437 | #else /* !__ia64__ */ |
7407e2de AS |
4438 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4439 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4440 | #endif /* !__ia64__ */ |
4441 | ||
4442 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4443 | ||
24a09b5f | 4444 | if (child_pid == -1) |
51c2684e | 4445 | perror_with_name ("clone"); |
24a09b5f DJ |
4446 | |
4447 | ret = my_waitpid (child_pid, &status, 0); | |
4448 | if (ret == -1) | |
4449 | perror_with_name ("waitpid"); | |
4450 | else if (ret != child_pid) | |
4451 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4452 | if (! WIFSTOPPED (status)) | |
4453 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4454 | ||
14ce3065 DE |
4455 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
4456 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
4457 | if (ret != 0) |
4458 | { | |
4459 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4460 | if (ret != 0) | |
4461 | { | |
4462 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4463 | return; | |
4464 | } | |
4465 | ||
4466 | ret = my_waitpid (child_pid, &status, 0); | |
4467 | if (ret != child_pid) | |
4468 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4469 | else if (!WIFSIGNALED (status)) | |
4470 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4471 | "killed child", status); | |
4472 | ||
4473 | return; | |
4474 | } | |
4475 | ||
4476 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
4477 | if (ret != 0) | |
4478 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4479 | ||
4480 | ret = my_waitpid (child_pid, &status, 0); | |
4481 | ||
4482 | if (ret == child_pid && WIFSTOPPED (status) | |
4483 | && status >> 16 == PTRACE_EVENT_FORK) | |
4484 | { | |
4485 | second_pid = 0; | |
4486 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
4487 | if (ret == 0 && second_pid != 0) | |
4488 | { | |
4489 | int second_status; | |
4490 | ||
4491 | linux_supports_tracefork_flag = 1; | |
4492 | my_waitpid (second_pid, &second_status, 0); | |
4493 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
4494 | if (ret != 0) | |
4495 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4496 | my_waitpid (second_pid, &status, 0); | |
4497 | } | |
4498 | } | |
4499 | else | |
4500 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4501 | "(%d, status 0x%x)", ret, status); | |
4502 | ||
4503 | do | |
4504 | { | |
4505 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4506 | if (ret != 0) | |
4507 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4508 | my_waitpid (child_pid, &status, 0); | |
4509 | } | |
4510 | while (WIFSTOPPED (status)); | |
51c2684e | 4511 | |
e4b7f41c | 4512 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4513 | free (stack); |
e4b7f41c | 4514 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4515 | } |
4516 | ||
4517 | ||
2f2893d9 DJ |
4518 | static void |
4519 | linux_look_up_symbols (void) | |
4520 | { | |
0d62e5e8 | 4521 | #ifdef USE_THREAD_DB |
95954743 PA |
4522 | struct process_info *proc = current_process (); |
4523 | ||
cdbfd419 | 4524 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4525 | return; |
4526 | ||
6076632b DE |
4527 | /* If the kernel supports tracing forks then it also supports tracing |
4528 | clones, and then we don't need to use the magic thread event breakpoint | |
4529 | to learn about threads. */ | |
cdbfd419 | 4530 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4531 | #endif |
4532 | } | |
4533 | ||
e5379b03 | 4534 | static void |
ef57601b | 4535 | linux_request_interrupt (void) |
e5379b03 | 4536 | { |
a1928bad | 4537 | extern unsigned long signal_pid; |
e5379b03 | 4538 | |
95954743 PA |
4539 | if (!ptid_equal (cont_thread, null_ptid) |
4540 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4541 | { |
54a0b537 | 4542 | struct lwp_info *lwp; |
bd99dc85 | 4543 | int lwpid; |
e5379b03 | 4544 | |
54a0b537 | 4545 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4546 | lwpid = lwpid_of (lwp); |
4547 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4548 | } |
4549 | else | |
ef57601b | 4550 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4551 | } |
4552 | ||
aa691b87 RM |
4553 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4554 | to debugger memory starting at MYADDR. */ | |
4555 | ||
4556 | static int | |
f450004a | 4557 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4558 | { |
4559 | char filename[PATH_MAX]; | |
4560 | int fd, n; | |
95954743 | 4561 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4562 | |
6cebaf6e | 4563 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4564 | |
4565 | fd = open (filename, O_RDONLY); | |
4566 | if (fd < 0) | |
4567 | return -1; | |
4568 | ||
4569 | if (offset != (CORE_ADDR) 0 | |
4570 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4571 | n = -1; | |
4572 | else | |
4573 | n = read (fd, myaddr, len); | |
4574 | ||
4575 | close (fd); | |
4576 | ||
4577 | return n; | |
4578 | } | |
4579 | ||
d993e290 PA |
4580 | /* These breakpoint and watchpoint related wrapper functions simply |
4581 | pass on the function call if the target has registered a | |
4582 | corresponding function. */ | |
e013ee27 OF |
4583 | |
4584 | static int | |
d993e290 | 4585 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4586 | { |
d993e290 PA |
4587 | if (the_low_target.insert_point != NULL) |
4588 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4589 | else |
4590 | /* Unsupported (see target.h). */ | |
4591 | return 1; | |
4592 | } | |
4593 | ||
4594 | static int | |
d993e290 | 4595 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4596 | { |
d993e290 PA |
4597 | if (the_low_target.remove_point != NULL) |
4598 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4599 | else |
4600 | /* Unsupported (see target.h). */ | |
4601 | return 1; | |
4602 | } | |
4603 | ||
4604 | static int | |
4605 | linux_stopped_by_watchpoint (void) | |
4606 | { | |
c3adc08c PA |
4607 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4608 | ||
4609 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4610 | } |
4611 | ||
4612 | static CORE_ADDR | |
4613 | linux_stopped_data_address (void) | |
4614 | { | |
c3adc08c PA |
4615 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4616 | ||
4617 | return lwp->stopped_data_address; | |
e013ee27 OF |
4618 | } |
4619 | ||
42c81e2a | 4620 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
4621 | #if defined(__mcoldfire__) |
4622 | /* These should really be defined in the kernel's ptrace.h header. */ | |
4623 | #define PT_TEXT_ADDR 49*4 | |
4624 | #define PT_DATA_ADDR 50*4 | |
4625 | #define PT_TEXT_END_ADDR 51*4 | |
eb826dc6 MF |
4626 | #elif defined(BFIN) |
4627 | #define PT_TEXT_ADDR 220 | |
4628 | #define PT_TEXT_END_ADDR 224 | |
4629 | #define PT_DATA_ADDR 228 | |
58dbd541 YQ |
4630 | #elif defined(__TMS320C6X__) |
4631 | #define PT_TEXT_ADDR (0x10000*4) | |
4632 | #define PT_DATA_ADDR (0x10004*4) | |
4633 | #define PT_TEXT_END_ADDR (0x10008*4) | |
52fb6437 NS |
4634 | #endif |
4635 | ||
4636 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4637 | to tell gdb about. */ | |
4638 | ||
4639 | static int | |
4640 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4641 | { | |
4642 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
4643 | unsigned long text, text_end, data; | |
bd99dc85 | 4644 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4645 | |
4646 | errno = 0; | |
4647 | ||
4648 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
4649 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
4650 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
4651 | ||
4652 | if (errno == 0) | |
4653 | { | |
4654 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4655 | used by gdb) are relative to the beginning of the program, |
4656 | with the data segment immediately following the text segment. | |
4657 | However, the actual runtime layout in memory may put the data | |
4658 | somewhere else, so when we send gdb a data base-address, we | |
4659 | use the real data base address and subtract the compile-time | |
4660 | data base-address from it (which is just the length of the | |
4661 | text segment). BSS immediately follows data in both | |
4662 | cases. */ | |
52fb6437 NS |
4663 | *text_p = text; |
4664 | *data_p = data - (text_end - text); | |
1b3f6016 | 4665 | |
52fb6437 NS |
4666 | return 1; |
4667 | } | |
4668 | #endif | |
4669 | return 0; | |
4670 | } | |
4671 | #endif | |
4672 | ||
07e059b5 VP |
4673 | static int |
4674 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4675 | unsigned char *readbuf, unsigned const char *writebuf, |
4676 | CORE_ADDR offset, int len) | |
07e059b5 | 4677 | { |
d26e3629 | 4678 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4679 | } |
4680 | ||
d0722149 DE |
4681 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4682 | layout of the inferiors' architecture. */ | |
4683 | ||
4684 | static void | |
4685 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
4686 | { | |
4687 | int done = 0; | |
4688 | ||
4689 | if (the_low_target.siginfo_fixup != NULL) | |
4690 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4691 | ||
4692 | /* If there was no callback, or the callback didn't do anything, | |
4693 | then just do a straight memcpy. */ | |
4694 | if (!done) | |
4695 | { | |
4696 | if (direction == 1) | |
4697 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4698 | else | |
4699 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4700 | } | |
4701 | } | |
4702 | ||
4aa995e1 PA |
4703 | static int |
4704 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4705 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4706 | { | |
d0722149 | 4707 | int pid; |
4aa995e1 | 4708 | struct siginfo siginfo; |
d0722149 | 4709 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4710 | |
4711 | if (current_inferior == NULL) | |
4712 | return -1; | |
4713 | ||
bd99dc85 | 4714 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4715 | |
4716 | if (debug_threads) | |
d0722149 | 4717 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4718 | readbuf != NULL ? "Reading" : "Writing", |
4719 | pid); | |
4720 | ||
0adea5f7 | 4721 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4722 | return -1; |
4723 | ||
4724 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
4725 | return -1; | |
4726 | ||
d0722149 DE |
4727 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4728 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4729 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4730 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4731 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4732 | ||
4aa995e1 PA |
4733 | if (offset + len > sizeof (siginfo)) |
4734 | len = sizeof (siginfo) - offset; | |
4735 | ||
4736 | if (readbuf != NULL) | |
d0722149 | 4737 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4738 | else |
4739 | { | |
d0722149 DE |
4740 | memcpy (inf_siginfo + offset, writebuf, len); |
4741 | ||
4742 | /* Convert back to ptrace layout before flushing it out. */ | |
4743 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4744 | ||
4aa995e1 PA |
4745 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
4746 | return -1; | |
4747 | } | |
4748 | ||
4749 | return len; | |
4750 | } | |
4751 | ||
bd99dc85 PA |
4752 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4753 | so we notice when children change state; as the handler for the | |
4754 | sigsuspend in my_waitpid. */ | |
4755 | ||
4756 | static void | |
4757 | sigchld_handler (int signo) | |
4758 | { | |
4759 | int old_errno = errno; | |
4760 | ||
4761 | if (debug_threads) | |
e581f2b4 PA |
4762 | { |
4763 | do | |
4764 | { | |
4765 | /* fprintf is not async-signal-safe, so call write | |
4766 | directly. */ | |
4767 | if (write (2, "sigchld_handler\n", | |
4768 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4769 | break; /* just ignore */ | |
4770 | } while (0); | |
4771 | } | |
bd99dc85 PA |
4772 | |
4773 | if (target_is_async_p ()) | |
4774 | async_file_mark (); /* trigger a linux_wait */ | |
4775 | ||
4776 | errno = old_errno; | |
4777 | } | |
4778 | ||
4779 | static int | |
4780 | linux_supports_non_stop (void) | |
4781 | { | |
4782 | return 1; | |
4783 | } | |
4784 | ||
4785 | static int | |
4786 | linux_async (int enable) | |
4787 | { | |
4788 | int previous = (linux_event_pipe[0] != -1); | |
4789 | ||
8336d594 PA |
4790 | if (debug_threads) |
4791 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4792 | enable, previous); | |
4793 | ||
bd99dc85 PA |
4794 | if (previous != enable) |
4795 | { | |
4796 | sigset_t mask; | |
4797 | sigemptyset (&mask); | |
4798 | sigaddset (&mask, SIGCHLD); | |
4799 | ||
4800 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4801 | ||
4802 | if (enable) | |
4803 | { | |
4804 | if (pipe (linux_event_pipe) == -1) | |
4805 | fatal ("creating event pipe failed."); | |
4806 | ||
4807 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4808 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4809 | ||
4810 | /* Register the event loop handler. */ | |
4811 | add_file_handler (linux_event_pipe[0], | |
4812 | handle_target_event, NULL); | |
4813 | ||
4814 | /* Always trigger a linux_wait. */ | |
4815 | async_file_mark (); | |
4816 | } | |
4817 | else | |
4818 | { | |
4819 | delete_file_handler (linux_event_pipe[0]); | |
4820 | ||
4821 | close (linux_event_pipe[0]); | |
4822 | close (linux_event_pipe[1]); | |
4823 | linux_event_pipe[0] = -1; | |
4824 | linux_event_pipe[1] = -1; | |
4825 | } | |
4826 | ||
4827 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4828 | } | |
4829 | ||
4830 | return previous; | |
4831 | } | |
4832 | ||
4833 | static int | |
4834 | linux_start_non_stop (int nonstop) | |
4835 | { | |
4836 | /* Register or unregister from event-loop accordingly. */ | |
4837 | linux_async (nonstop); | |
4838 | return 0; | |
4839 | } | |
4840 | ||
cf8fd78b PA |
4841 | static int |
4842 | linux_supports_multi_process (void) | |
4843 | { | |
4844 | return 1; | |
4845 | } | |
4846 | ||
03583c20 UW |
4847 | static int |
4848 | linux_supports_disable_randomization (void) | |
4849 | { | |
4850 | #ifdef HAVE_PERSONALITY | |
4851 | return 1; | |
4852 | #else | |
4853 | return 0; | |
4854 | #endif | |
4855 | } | |
efcbbd14 | 4856 | |
d1feda86 YQ |
4857 | static int |
4858 | linux_supports_agent (void) | |
4859 | { | |
4860 | return 1; | |
4861 | } | |
4862 | ||
efcbbd14 UW |
4863 | /* Enumerate spufs IDs for process PID. */ |
4864 | static int | |
4865 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
4866 | { | |
4867 | int pos = 0; | |
4868 | int written = 0; | |
4869 | char path[128]; | |
4870 | DIR *dir; | |
4871 | struct dirent *entry; | |
4872 | ||
4873 | sprintf (path, "/proc/%ld/fd", pid); | |
4874 | dir = opendir (path); | |
4875 | if (!dir) | |
4876 | return -1; | |
4877 | ||
4878 | rewinddir (dir); | |
4879 | while ((entry = readdir (dir)) != NULL) | |
4880 | { | |
4881 | struct stat st; | |
4882 | struct statfs stfs; | |
4883 | int fd; | |
4884 | ||
4885 | fd = atoi (entry->d_name); | |
4886 | if (!fd) | |
4887 | continue; | |
4888 | ||
4889 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4890 | if (stat (path, &st) != 0) | |
4891 | continue; | |
4892 | if (!S_ISDIR (st.st_mode)) | |
4893 | continue; | |
4894 | ||
4895 | if (statfs (path, &stfs) != 0) | |
4896 | continue; | |
4897 | if (stfs.f_type != SPUFS_MAGIC) | |
4898 | continue; | |
4899 | ||
4900 | if (pos >= offset && pos + 4 <= offset + len) | |
4901 | { | |
4902 | *(unsigned int *)(buf + pos - offset) = fd; | |
4903 | written += 4; | |
4904 | } | |
4905 | pos += 4; | |
4906 | } | |
4907 | ||
4908 | closedir (dir); | |
4909 | return written; | |
4910 | } | |
4911 | ||
4912 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4913 | object type, using the /proc file system. */ | |
4914 | static int | |
4915 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4916 | unsigned const char *writebuf, | |
4917 | CORE_ADDR offset, int len) | |
4918 | { | |
4919 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4920 | char buf[128]; | |
4921 | int fd = 0; | |
4922 | int ret = 0; | |
4923 | ||
4924 | if (!writebuf && !readbuf) | |
4925 | return -1; | |
4926 | ||
4927 | if (!*annex) | |
4928 | { | |
4929 | if (!readbuf) | |
4930 | return -1; | |
4931 | else | |
4932 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4933 | } | |
4934 | ||
4935 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
4936 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4937 | if (fd <= 0) | |
4938 | return -1; | |
4939 | ||
4940 | if (offset != 0 | |
4941 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4942 | { | |
4943 | close (fd); | |
4944 | return 0; | |
4945 | } | |
4946 | ||
4947 | if (writebuf) | |
4948 | ret = write (fd, writebuf, (size_t) len); | |
4949 | else | |
4950 | ret = read (fd, readbuf, (size_t) len); | |
4951 | ||
4952 | close (fd); | |
4953 | return ret; | |
4954 | } | |
4955 | ||
723b724b | 4956 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
4957 | struct target_loadseg |
4958 | { | |
4959 | /* Core address to which the segment is mapped. */ | |
4960 | Elf32_Addr addr; | |
4961 | /* VMA recorded in the program header. */ | |
4962 | Elf32_Addr p_vaddr; | |
4963 | /* Size of this segment in memory. */ | |
4964 | Elf32_Word p_memsz; | |
4965 | }; | |
4966 | ||
723b724b | 4967 | # if defined PT_GETDSBT |
78d85199 YQ |
4968 | struct target_loadmap |
4969 | { | |
4970 | /* Protocol version number, must be zero. */ | |
4971 | Elf32_Word version; | |
4972 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
4973 | unsigned *dsbt_table; | |
4974 | unsigned dsbt_size, dsbt_index; | |
4975 | /* Number of segments in this map. */ | |
4976 | Elf32_Word nsegs; | |
4977 | /* The actual memory map. */ | |
4978 | struct target_loadseg segs[/*nsegs*/]; | |
4979 | }; | |
723b724b MF |
4980 | # define LINUX_LOADMAP PT_GETDSBT |
4981 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
4982 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
4983 | # else | |
4984 | struct target_loadmap | |
4985 | { | |
4986 | /* Protocol version number, must be zero. */ | |
4987 | Elf32_Half version; | |
4988 | /* Number of segments in this map. */ | |
4989 | Elf32_Half nsegs; | |
4990 | /* The actual memory map. */ | |
4991 | struct target_loadseg segs[/*nsegs*/]; | |
4992 | }; | |
4993 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
4994 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
4995 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
4996 | # endif | |
78d85199 | 4997 | |
78d85199 YQ |
4998 | static int |
4999 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5000 | unsigned char *myaddr, unsigned int len) | |
5001 | { | |
5002 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5003 | int addr = -1; | |
5004 | struct target_loadmap *data = NULL; | |
5005 | unsigned int actual_length, copy_length; | |
5006 | ||
5007 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5008 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5009 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5010 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5011 | else |
5012 | return -1; | |
5013 | ||
723b724b | 5014 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5015 | return -1; |
5016 | ||
5017 | if (data == NULL) | |
5018 | return -1; | |
5019 | ||
5020 | actual_length = sizeof (struct target_loadmap) | |
5021 | + sizeof (struct target_loadseg) * data->nsegs; | |
5022 | ||
5023 | if (offset < 0 || offset > actual_length) | |
5024 | return -1; | |
5025 | ||
5026 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5027 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5028 | return copy_length; | |
5029 | } | |
723b724b MF |
5030 | #else |
5031 | # define linux_read_loadmap NULL | |
5032 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5033 | |
1570b33e L |
5034 | static void |
5035 | linux_process_qsupported (const char *query) | |
5036 | { | |
5037 | if (the_low_target.process_qsupported != NULL) | |
5038 | the_low_target.process_qsupported (query); | |
5039 | } | |
5040 | ||
219f2f23 PA |
5041 | static int |
5042 | linux_supports_tracepoints (void) | |
5043 | { | |
5044 | if (*the_low_target.supports_tracepoints == NULL) | |
5045 | return 0; | |
5046 | ||
5047 | return (*the_low_target.supports_tracepoints) (); | |
5048 | } | |
5049 | ||
5050 | static CORE_ADDR | |
5051 | linux_read_pc (struct regcache *regcache) | |
5052 | { | |
5053 | if (the_low_target.get_pc == NULL) | |
5054 | return 0; | |
5055 | ||
5056 | return (*the_low_target.get_pc) (regcache); | |
5057 | } | |
5058 | ||
5059 | static void | |
5060 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5061 | { | |
5062 | gdb_assert (the_low_target.set_pc != NULL); | |
5063 | ||
5064 | (*the_low_target.set_pc) (regcache, pc); | |
5065 | } | |
5066 | ||
8336d594 PA |
5067 | static int |
5068 | linux_thread_stopped (struct thread_info *thread) | |
5069 | { | |
5070 | return get_thread_lwp (thread)->stopped; | |
5071 | } | |
5072 | ||
5073 | /* This exposes stop-all-threads functionality to other modules. */ | |
5074 | ||
5075 | static void | |
7984d532 | 5076 | linux_pause_all (int freeze) |
8336d594 | 5077 | { |
7984d532 PA |
5078 | stop_all_lwps (freeze, NULL); |
5079 | } | |
5080 | ||
5081 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5082 | modules. */ | |
5083 | ||
5084 | static void | |
5085 | linux_unpause_all (int unfreeze) | |
5086 | { | |
5087 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5088 | } |
5089 | ||
90d74c30 PA |
5090 | static int |
5091 | linux_prepare_to_access_memory (void) | |
5092 | { | |
5093 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5094 | running LWP. */ | |
5095 | if (non_stop) | |
5096 | linux_pause_all (1); | |
5097 | return 0; | |
5098 | } | |
5099 | ||
5100 | static void | |
0146f85b | 5101 | linux_done_accessing_memory (void) |
90d74c30 PA |
5102 | { |
5103 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5104 | running LWP. */ | |
5105 | if (non_stop) | |
5106 | linux_unpause_all (1); | |
5107 | } | |
5108 | ||
fa593d66 PA |
5109 | static int |
5110 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5111 | CORE_ADDR collector, | |
5112 | CORE_ADDR lockaddr, | |
5113 | ULONGEST orig_size, | |
5114 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5115 | CORE_ADDR *trampoline, |
5116 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5117 | unsigned char *jjump_pad_insn, |
5118 | ULONGEST *jjump_pad_insn_size, | |
5119 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5120 | CORE_ADDR *adjusted_insn_addr_end, |
5121 | char *err) | |
fa593d66 PA |
5122 | { |
5123 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5124 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5125 | jump_entry, trampoline, trampoline_size, |
5126 | jjump_pad_insn, jjump_pad_insn_size, | |
5127 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5128 | err); | |
fa593d66 PA |
5129 | } |
5130 | ||
6a271cae PA |
5131 | static struct emit_ops * |
5132 | linux_emit_ops (void) | |
5133 | { | |
5134 | if (the_low_target.emit_ops != NULL) | |
5135 | return (*the_low_target.emit_ops) (); | |
5136 | else | |
5137 | return NULL; | |
5138 | } | |
5139 | ||
405f8e94 SS |
5140 | static int |
5141 | linux_get_min_fast_tracepoint_insn_len (void) | |
5142 | { | |
5143 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5144 | } | |
5145 | ||
2268b414 JK |
5146 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5147 | ||
5148 | static int | |
5149 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5150 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5151 | { | |
5152 | char filename[PATH_MAX]; | |
5153 | int fd; | |
5154 | const int auxv_size = is_elf64 | |
5155 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5156 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5157 | ||
5158 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5159 | ||
5160 | fd = open (filename, O_RDONLY); | |
5161 | if (fd < 0) | |
5162 | return 1; | |
5163 | ||
5164 | *phdr_memaddr = 0; | |
5165 | *num_phdr = 0; | |
5166 | while (read (fd, buf, auxv_size) == auxv_size | |
5167 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5168 | { | |
5169 | if (is_elf64) | |
5170 | { | |
5171 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5172 | ||
5173 | switch (aux->a_type) | |
5174 | { | |
5175 | case AT_PHDR: | |
5176 | *phdr_memaddr = aux->a_un.a_val; | |
5177 | break; | |
5178 | case AT_PHNUM: | |
5179 | *num_phdr = aux->a_un.a_val; | |
5180 | break; | |
5181 | } | |
5182 | } | |
5183 | else | |
5184 | { | |
5185 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5186 | ||
5187 | switch (aux->a_type) | |
5188 | { | |
5189 | case AT_PHDR: | |
5190 | *phdr_memaddr = aux->a_un.a_val; | |
5191 | break; | |
5192 | case AT_PHNUM: | |
5193 | *num_phdr = aux->a_un.a_val; | |
5194 | break; | |
5195 | } | |
5196 | } | |
5197 | } | |
5198 | ||
5199 | close (fd); | |
5200 | ||
5201 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5202 | { | |
5203 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5204 | "phdr_memaddr = %ld, phdr_num = %d", | |
5205 | (long) *phdr_memaddr, *num_phdr); | |
5206 | return 2; | |
5207 | } | |
5208 | ||
5209 | return 0; | |
5210 | } | |
5211 | ||
5212 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5213 | ||
5214 | static CORE_ADDR | |
5215 | get_dynamic (const int pid, const int is_elf64) | |
5216 | { | |
5217 | CORE_ADDR phdr_memaddr, relocation; | |
5218 | int num_phdr, i; | |
5219 | unsigned char *phdr_buf; | |
5220 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5221 | ||
5222 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5223 | return 0; | |
5224 | ||
5225 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5226 | phdr_buf = alloca (num_phdr * phdr_size); | |
5227 | ||
5228 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5229 | return 0; | |
5230 | ||
5231 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5232 | non-zero for PIE ones. */ | |
5233 | relocation = -1; | |
5234 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5235 | if (is_elf64) | |
5236 | { | |
5237 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5238 | ||
5239 | if (p->p_type == PT_PHDR) | |
5240 | relocation = phdr_memaddr - p->p_vaddr; | |
5241 | } | |
5242 | else | |
5243 | { | |
5244 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5245 | ||
5246 | if (p->p_type == PT_PHDR) | |
5247 | relocation = phdr_memaddr - p->p_vaddr; | |
5248 | } | |
5249 | ||
5250 | if (relocation == -1) | |
5251 | { | |
5252 | warning ("Unexpected missing PT_PHDR"); | |
5253 | return 0; | |
5254 | } | |
5255 | ||
5256 | for (i = 0; i < num_phdr; i++) | |
5257 | { | |
5258 | if (is_elf64) | |
5259 | { | |
5260 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5261 | ||
5262 | if (p->p_type == PT_DYNAMIC) | |
5263 | return p->p_vaddr + relocation; | |
5264 | } | |
5265 | else | |
5266 | { | |
5267 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5268 | ||
5269 | if (p->p_type == PT_DYNAMIC) | |
5270 | return p->p_vaddr + relocation; | |
5271 | } | |
5272 | } | |
5273 | ||
5274 | return 0; | |
5275 | } | |
5276 | ||
5277 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
5278 | can be 0 if the inferior does not yet have the library list initialized. */ | |
5279 | ||
5280 | static CORE_ADDR | |
5281 | get_r_debug (const int pid, const int is_elf64) | |
5282 | { | |
5283 | CORE_ADDR dynamic_memaddr; | |
5284 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5285 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
5286 | ||
5287 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5288 | if (dynamic_memaddr == 0) | |
5289 | return (CORE_ADDR) -1; | |
5290 | ||
5291 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5292 | { | |
5293 | if (is_elf64) | |
5294 | { | |
5295 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
5296 | ||
5297 | if (dyn->d_tag == DT_DEBUG) | |
5298 | return dyn->d_un.d_val; | |
5299 | ||
5300 | if (dyn->d_tag == DT_NULL) | |
5301 | break; | |
5302 | } | |
5303 | else | |
5304 | { | |
5305 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
5306 | ||
5307 | if (dyn->d_tag == DT_DEBUG) | |
5308 | return dyn->d_un.d_val; | |
5309 | ||
5310 | if (dyn->d_tag == DT_NULL) | |
5311 | break; | |
5312 | } | |
5313 | ||
5314 | dynamic_memaddr += dyn_size; | |
5315 | } | |
5316 | ||
5317 | return (CORE_ADDR) -1; | |
5318 | } | |
5319 | ||
5320 | /* Read one pointer from MEMADDR in the inferior. */ | |
5321 | ||
5322 | static int | |
5323 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5324 | { | |
5325 | *ptr = 0; | |
5326 | return linux_read_memory (memaddr, (unsigned char *) ptr, ptr_size); | |
5327 | } | |
5328 | ||
5329 | struct link_map_offsets | |
5330 | { | |
5331 | /* Offset and size of r_debug.r_version. */ | |
5332 | int r_version_offset; | |
5333 | ||
5334 | /* Offset and size of r_debug.r_map. */ | |
5335 | int r_map_offset; | |
5336 | ||
5337 | /* Offset to l_addr field in struct link_map. */ | |
5338 | int l_addr_offset; | |
5339 | ||
5340 | /* Offset to l_name field in struct link_map. */ | |
5341 | int l_name_offset; | |
5342 | ||
5343 | /* Offset to l_ld field in struct link_map. */ | |
5344 | int l_ld_offset; | |
5345 | ||
5346 | /* Offset to l_next field in struct link_map. */ | |
5347 | int l_next_offset; | |
5348 | ||
5349 | /* Offset to l_prev field in struct link_map. */ | |
5350 | int l_prev_offset; | |
5351 | }; | |
5352 | ||
5353 | /* Construct qXfer:libraries:read reply. */ | |
5354 | ||
5355 | static int | |
5356 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5357 | unsigned const char *writebuf, | |
5358 | CORE_ADDR offset, int len) | |
5359 | { | |
5360 | char *document; | |
5361 | unsigned document_len; | |
5362 | struct process_info_private *const priv = current_process ()->private; | |
5363 | char filename[PATH_MAX]; | |
5364 | int pid, is_elf64; | |
5365 | ||
5366 | static const struct link_map_offsets lmo_32bit_offsets = | |
5367 | { | |
5368 | 0, /* r_version offset. */ | |
5369 | 4, /* r_debug.r_map offset. */ | |
5370 | 0, /* l_addr offset in link_map. */ | |
5371 | 4, /* l_name offset in link_map. */ | |
5372 | 8, /* l_ld offset in link_map. */ | |
5373 | 12, /* l_next offset in link_map. */ | |
5374 | 16 /* l_prev offset in link_map. */ | |
5375 | }; | |
5376 | ||
5377 | static const struct link_map_offsets lmo_64bit_offsets = | |
5378 | { | |
5379 | 0, /* r_version offset. */ | |
5380 | 8, /* r_debug.r_map offset. */ | |
5381 | 0, /* l_addr offset in link_map. */ | |
5382 | 8, /* l_name offset in link_map. */ | |
5383 | 16, /* l_ld offset in link_map. */ | |
5384 | 24, /* l_next offset in link_map. */ | |
5385 | 32 /* l_prev offset in link_map. */ | |
5386 | }; | |
5387 | const struct link_map_offsets *lmo; | |
5388 | ||
5389 | if (writebuf != NULL) | |
5390 | return -2; | |
5391 | if (readbuf == NULL) | |
5392 | return -1; | |
5393 | ||
5394 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5395 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
5396 | is_elf64 = elf_64_file_p (filename); | |
5397 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; | |
5398 | ||
5399 | if (priv->r_debug == 0) | |
5400 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5401 | ||
5402 | if (priv->r_debug == (CORE_ADDR) -1 || priv->r_debug == 0) | |
5403 | { | |
5404 | document = xstrdup ("<library-list-svr4 version=\"1.0\"/>\n"); | |
5405 | } | |
5406 | else | |
5407 | { | |
5408 | int allocated = 1024; | |
5409 | char *p; | |
5410 | const int ptr_size = is_elf64 ? 8 : 4; | |
5411 | CORE_ADDR lm_addr, lm_prev, l_name, l_addr, l_ld, l_next, l_prev; | |
5412 | int r_version, header_done = 0; | |
5413 | ||
5414 | document = xmalloc (allocated); | |
5415 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5416 | p = document + strlen (document); | |
5417 | ||
5418 | r_version = 0; | |
5419 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, | |
5420 | (unsigned char *) &r_version, | |
5421 | sizeof (r_version)) != 0 | |
5422 | || r_version != 1) | |
5423 | { | |
5424 | warning ("unexpected r_debug version %d", r_version); | |
5425 | goto done; | |
5426 | } | |
5427 | ||
5428 | if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5429 | &lm_addr, ptr_size) != 0) | |
5430 | { | |
5431 | warning ("unable to read r_map from 0x%lx", | |
5432 | (long) priv->r_debug + lmo->r_map_offset); | |
5433 | goto done; | |
5434 | } | |
5435 | ||
5436 | lm_prev = 0; | |
5437 | while (read_one_ptr (lm_addr + lmo->l_name_offset, | |
5438 | &l_name, ptr_size) == 0 | |
5439 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5440 | &l_addr, ptr_size) == 0 | |
5441 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5442 | &l_ld, ptr_size) == 0 | |
5443 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5444 | &l_prev, ptr_size) == 0 | |
5445 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5446 | &l_next, ptr_size) == 0) | |
5447 | { | |
5448 | unsigned char libname[PATH_MAX]; | |
5449 | ||
5450 | if (lm_prev != l_prev) | |
5451 | { | |
5452 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", | |
5453 | (long) lm_prev, (long) l_prev); | |
5454 | break; | |
5455 | } | |
5456 | ||
5457 | /* Not checking for error because reading may stop before | |
5458 | we've got PATH_MAX worth of characters. */ | |
5459 | libname[0] = '\0'; | |
5460 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5461 | libname[sizeof (libname) - 1] = '\0'; | |
5462 | if (libname[0] != '\0') | |
5463 | { | |
5464 | /* 6x the size for xml_escape_text below. */ | |
5465 | size_t len = 6 * strlen ((char *) libname); | |
5466 | char *name; | |
5467 | ||
5468 | if (!header_done) | |
5469 | { | |
5470 | /* Terminate `<library-list-svr4'. */ | |
5471 | *p++ = '>'; | |
5472 | header_done = 1; | |
5473 | } | |
5474 | ||
5475 | while (allocated < p - document + len + 200) | |
5476 | { | |
5477 | /* Expand to guarantee sufficient storage. */ | |
5478 | uintptr_t document_len = p - document; | |
5479 | ||
5480 | document = xrealloc (document, 2 * allocated); | |
5481 | allocated *= 2; | |
5482 | p = document + document_len; | |
5483 | } | |
5484 | ||
5485 | name = xml_escape_text ((char *) libname); | |
5486 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5487 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5488 | name, (unsigned long) lm_addr, | |
5489 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5490 | free (name); | |
5491 | } | |
5492 | else if (lm_prev == 0) | |
5493 | { | |
5494 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); | |
5495 | p = p + strlen (p); | |
5496 | } | |
5497 | ||
5498 | if (l_next == 0) | |
5499 | break; | |
5500 | ||
5501 | lm_prev = lm_addr; | |
5502 | lm_addr = l_next; | |
5503 | } | |
5504 | done: | |
5505 | strcpy (p, "</library-list-svr4>"); | |
5506 | } | |
5507 | ||
5508 | document_len = strlen (document); | |
5509 | if (offset < document_len) | |
5510 | document_len -= offset; | |
5511 | else | |
5512 | document_len = 0; | |
5513 | if (len > document_len) | |
5514 | len = document_len; | |
5515 | ||
5516 | memcpy (readbuf, document + offset, len); | |
5517 | xfree (document); | |
5518 | ||
5519 | return len; | |
5520 | } | |
5521 | ||
ce3a066d DJ |
5522 | static struct target_ops linux_target_ops = { |
5523 | linux_create_inferior, | |
5524 | linux_attach, | |
5525 | linux_kill, | |
6ad8ae5c | 5526 | linux_detach, |
8336d594 | 5527 | linux_mourn, |
444d6139 | 5528 | linux_join, |
ce3a066d DJ |
5529 | linux_thread_alive, |
5530 | linux_resume, | |
5531 | linux_wait, | |
5532 | linux_fetch_registers, | |
5533 | linux_store_registers, | |
90d74c30 | 5534 | linux_prepare_to_access_memory, |
0146f85b | 5535 | linux_done_accessing_memory, |
ce3a066d DJ |
5536 | linux_read_memory, |
5537 | linux_write_memory, | |
2f2893d9 | 5538 | linux_look_up_symbols, |
ef57601b | 5539 | linux_request_interrupt, |
aa691b87 | 5540 | linux_read_auxv, |
d993e290 PA |
5541 | linux_insert_point, |
5542 | linux_remove_point, | |
e013ee27 OF |
5543 | linux_stopped_by_watchpoint, |
5544 | linux_stopped_data_address, | |
42c81e2a | 5545 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 5546 | linux_read_offsets, |
dae5f5cf DJ |
5547 | #else |
5548 | NULL, | |
5549 | #endif | |
5550 | #ifdef USE_THREAD_DB | |
5551 | thread_db_get_tls_address, | |
5552 | #else | |
5553 | NULL, | |
52fb6437 | 5554 | #endif |
efcbbd14 | 5555 | linux_qxfer_spu, |
59a016f0 | 5556 | hostio_last_error_from_errno, |
07e059b5 | 5557 | linux_qxfer_osdata, |
4aa995e1 | 5558 | linux_xfer_siginfo, |
bd99dc85 PA |
5559 | linux_supports_non_stop, |
5560 | linux_async, | |
5561 | linux_start_non_stop, | |
cdbfd419 PP |
5562 | linux_supports_multi_process, |
5563 | #ifdef USE_THREAD_DB | |
dc146f7c | 5564 | thread_db_handle_monitor_command, |
cdbfd419 | 5565 | #else |
dc146f7c | 5566 | NULL, |
cdbfd419 | 5567 | #endif |
d26e3629 | 5568 | linux_common_core_of_thread, |
78d85199 | 5569 | linux_read_loadmap, |
219f2f23 PA |
5570 | linux_process_qsupported, |
5571 | linux_supports_tracepoints, | |
5572 | linux_read_pc, | |
8336d594 PA |
5573 | linux_write_pc, |
5574 | linux_thread_stopped, | |
7984d532 | 5575 | NULL, |
711e434b | 5576 | linux_pause_all, |
7984d532 | 5577 | linux_unpause_all, |
fa593d66 PA |
5578 | linux_cancel_breakpoints, |
5579 | linux_stabilize_threads, | |
6a271cae | 5580 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
5581 | linux_emit_ops, |
5582 | linux_supports_disable_randomization, | |
405f8e94 | 5583 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 5584 | linux_qxfer_libraries_svr4, |
d1feda86 | 5585 | linux_supports_agent, |
ce3a066d DJ |
5586 | }; |
5587 | ||
0d62e5e8 DJ |
5588 | static void |
5589 | linux_init_signals () | |
5590 | { | |
5591 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5592 | to find what the cancel signal actually is. */ | |
1a981360 | 5593 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5594 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5595 | #endif |
0d62e5e8 DJ |
5596 | } |
5597 | ||
da6d8c04 DJ |
5598 | void |
5599 | initialize_low (void) | |
5600 | { | |
bd99dc85 PA |
5601 | struct sigaction sigchld_action; |
5602 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5603 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5604 | set_breakpoint_data (the_low_target.breakpoint, |
5605 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5606 | linux_init_signals (); |
24a09b5f | 5607 | linux_test_for_tracefork (); |
52fa2412 UW |
5608 | #ifdef HAVE_LINUX_REGSETS |
5609 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
5610 | ; | |
bca929d3 | 5611 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 5612 | #endif |
bd99dc85 PA |
5613 | |
5614 | sigchld_action.sa_handler = sigchld_handler; | |
5615 | sigemptyset (&sigchld_action.sa_mask); | |
5616 | sigchld_action.sa_flags = SA_RESTART; | |
5617 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 5618 | } |