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 | |
24a09b5f DJ |
95 | /* A list of all unknown processes which receive stop signals. Some other |
96 | process will presumably claim each of these as forked children | |
97 | momentarily. */ | |
98 | ||
99 | struct inferior_list stopped_pids; | |
100 | ||
0d62e5e8 DJ |
101 | /* FIXME this is a bit of a hack, and could be removed. */ |
102 | int stopping_threads; | |
103 | ||
104 | /* FIXME make into a target method? */ | |
24a09b5f | 105 | int using_threads = 1; |
24a09b5f | 106 | |
fa593d66 PA |
107 | /* True if we're presently stabilizing threads (moving them out of |
108 | jump pads). */ | |
109 | static int stabilizing_threads; | |
110 | ||
95954743 PA |
111 | /* This flag is true iff we've just created or attached to our first |
112 | inferior but it has not stopped yet. As soon as it does, we need | |
113 | to call the low target's arch_setup callback. Doing this only on | |
114 | the first inferior avoids reinializing the architecture on every | |
115 | inferior, and avoids messing with the register caches of the | |
116 | already running inferiors. NOTE: this assumes all inferiors under | |
117 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
118 | static int new_inferior; |
119 | ||
2acc282a | 120 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 121 | int step, int signal, siginfo_t *info); |
2bd7c093 | 122 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
123 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
124 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 125 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 126 | static void *add_lwp (ptid_t ptid); |
c35fafde | 127 | static int linux_stopped_by_watchpoint (void); |
95954743 | 128 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 129 | static void proceed_all_lwps (void); |
d50171e4 PA |
130 | static int finish_step_over (struct lwp_info *lwp); |
131 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
132 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 133 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
134 | |
135 | /* True if the low target can hardware single-step. Such targets | |
136 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
137 | ||
138 | static int | |
139 | can_hardware_single_step (void) | |
140 | { | |
141 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
142 | } | |
143 | ||
144 | /* True if the low target supports memory breakpoints. If so, we'll | |
145 | have a GET_PC implementation. */ | |
146 | ||
147 | static int | |
148 | supports_breakpoints (void) | |
149 | { | |
150 | return (the_low_target.get_pc != NULL); | |
151 | } | |
0d62e5e8 | 152 | |
fa593d66 PA |
153 | /* Returns true if this target can support fast tracepoints. This |
154 | does not mean that the in-process agent has been loaded in the | |
155 | inferior. */ | |
156 | ||
157 | static int | |
158 | supports_fast_tracepoints (void) | |
159 | { | |
160 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
161 | } | |
162 | ||
0d62e5e8 DJ |
163 | struct pending_signals |
164 | { | |
165 | int signal; | |
32ca6d61 | 166 | siginfo_t info; |
0d62e5e8 DJ |
167 | struct pending_signals *prev; |
168 | }; | |
611cb4a5 | 169 | |
14ce3065 DE |
170 | #define PTRACE_ARG3_TYPE void * |
171 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 172 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 173 | |
58caa3dc | 174 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
175 | static char *disabled_regsets; |
176 | static int num_regsets; | |
58caa3dc DJ |
177 | #endif |
178 | ||
bd99dc85 PA |
179 | /* The read/write ends of the pipe registered as waitable file in the |
180 | event loop. */ | |
181 | static int linux_event_pipe[2] = { -1, -1 }; | |
182 | ||
183 | /* True if we're currently in async mode. */ | |
184 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
185 | ||
02fc4de7 | 186 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
187 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
188 | ||
d0722149 DE |
189 | /* Accepts an integer PID; Returns a string representing a file that |
190 | can be opened to get info for the child process. | |
191 | Space for the result is malloc'd, caller must free. */ | |
192 | ||
193 | char * | |
194 | linux_child_pid_to_exec_file (int pid) | |
195 | { | |
196 | char *name1, *name2; | |
197 | ||
198 | name1 = xmalloc (MAXPATHLEN); | |
199 | name2 = xmalloc (MAXPATHLEN); | |
200 | memset (name2, 0, MAXPATHLEN); | |
201 | ||
202 | sprintf (name1, "/proc/%d/exe", pid); | |
203 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
204 | { | |
205 | free (name1); | |
206 | return name2; | |
207 | } | |
208 | else | |
209 | { | |
210 | free (name2); | |
211 | return name1; | |
212 | } | |
213 | } | |
214 | ||
215 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
216 | ||
217 | static int | |
957f3f49 | 218 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
219 | { |
220 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
221 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
222 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
223 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
224 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
225 | } | |
226 | ||
227 | /* Return non-zero if FILE is a 64-bit ELF file, | |
228 | zero if the file is not a 64-bit ELF file, | |
229 | and -1 if the file is not accessible or doesn't exist. */ | |
230 | ||
231 | int | |
232 | elf_64_file_p (const char *file) | |
233 | { | |
957f3f49 | 234 | Elf64_Ehdr header; |
d0722149 DE |
235 | int fd; |
236 | ||
237 | fd = open (file, O_RDONLY); | |
238 | if (fd < 0) | |
239 | return -1; | |
240 | ||
241 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
242 | { | |
243 | close (fd); | |
244 | return 0; | |
245 | } | |
246 | close (fd); | |
247 | ||
248 | return elf_64_header_p (&header); | |
249 | } | |
250 | ||
bd99dc85 PA |
251 | static void |
252 | delete_lwp (struct lwp_info *lwp) | |
253 | { | |
254 | remove_thread (get_lwp_thread (lwp)); | |
255 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 256 | free (lwp->arch_private); |
bd99dc85 PA |
257 | free (lwp); |
258 | } | |
259 | ||
95954743 PA |
260 | /* Add a process to the common process list, and set its private |
261 | data. */ | |
262 | ||
263 | static struct process_info * | |
264 | linux_add_process (int pid, int attached) | |
265 | { | |
266 | struct process_info *proc; | |
267 | ||
268 | /* Is this the first process? If so, then set the arch. */ | |
269 | if (all_processes.head == NULL) | |
270 | new_inferior = 1; | |
271 | ||
272 | proc = add_process (pid, attached); | |
273 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
274 | ||
aa5ca48f DE |
275 | if (the_low_target.new_process != NULL) |
276 | proc->private->arch_private = the_low_target.new_process (); | |
277 | ||
95954743 PA |
278 | return proc; |
279 | } | |
280 | ||
07d4f67e DE |
281 | /* Wrapper function for waitpid which handles EINTR, and emulates |
282 | __WALL for systems where that is not available. */ | |
283 | ||
284 | static int | |
285 | my_waitpid (int pid, int *status, int flags) | |
286 | { | |
287 | int ret, out_errno; | |
288 | ||
289 | if (debug_threads) | |
290 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
291 | ||
292 | if (flags & __WALL) | |
293 | { | |
294 | sigset_t block_mask, org_mask, wake_mask; | |
295 | int wnohang; | |
296 | ||
297 | wnohang = (flags & WNOHANG) != 0; | |
298 | flags &= ~(__WALL | __WCLONE); | |
299 | flags |= WNOHANG; | |
300 | ||
301 | /* Block all signals while here. This avoids knowing about | |
302 | LinuxThread's signals. */ | |
303 | sigfillset (&block_mask); | |
304 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
305 | ||
306 | /* ... except during the sigsuspend below. */ | |
307 | sigemptyset (&wake_mask); | |
308 | ||
309 | while (1) | |
310 | { | |
311 | /* Since all signals are blocked, there's no need to check | |
312 | for EINTR here. */ | |
313 | ret = waitpid (pid, status, flags); | |
314 | out_errno = errno; | |
315 | ||
316 | if (ret == -1 && out_errno != ECHILD) | |
317 | break; | |
318 | else if (ret > 0) | |
319 | break; | |
320 | ||
321 | if (flags & __WCLONE) | |
322 | { | |
323 | /* We've tried both flavors now. If WNOHANG is set, | |
324 | there's nothing else to do, just bail out. */ | |
325 | if (wnohang) | |
326 | break; | |
327 | ||
328 | if (debug_threads) | |
329 | fprintf (stderr, "blocking\n"); | |
330 | ||
331 | /* Block waiting for signals. */ | |
332 | sigsuspend (&wake_mask); | |
333 | } | |
334 | ||
335 | flags ^= __WCLONE; | |
336 | } | |
337 | ||
338 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
339 | } | |
340 | else | |
341 | { | |
342 | do | |
343 | ret = waitpid (pid, status, flags); | |
344 | while (ret == -1 && errno == EINTR); | |
345 | out_errno = errno; | |
346 | } | |
347 | ||
348 | if (debug_threads) | |
349 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
350 | pid, flags, status ? *status : -1, ret); | |
351 | ||
352 | errno = out_errno; | |
353 | return ret; | |
354 | } | |
355 | ||
bd99dc85 PA |
356 | /* Handle a GNU/Linux extended wait response. If we see a clone |
357 | event, we need to add the new LWP to our list (and not report the | |
358 | trap to higher layers). */ | |
0d62e5e8 | 359 | |
24a09b5f | 360 | static void |
54a0b537 | 361 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
362 | { |
363 | int event = wstat >> 16; | |
54a0b537 | 364 | struct lwp_info *new_lwp; |
24a09b5f DJ |
365 | |
366 | if (event == PTRACE_EVENT_CLONE) | |
367 | { | |
95954743 | 368 | ptid_t ptid; |
24a09b5f | 369 | unsigned long new_pid; |
836acd6d | 370 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 371 | |
bd99dc85 | 372 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
373 | |
374 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
375 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
376 | { | |
377 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
378 | hits the SIGSTOP, but we're already attached. */ | |
379 | ||
97438e3f | 380 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
381 | |
382 | if (ret == -1) | |
383 | perror_with_name ("waiting for new child"); | |
384 | else if (ret != new_pid) | |
385 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 386 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
387 | warning ("wait returned unexpected status 0x%x", status); |
388 | } | |
389 | ||
1e7fc18c | 390 | linux_enable_event_reporting (new_pid); |
24a09b5f | 391 | |
95954743 PA |
392 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
393 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
394 | add_thread (ptid, new_lwp); | |
24a09b5f | 395 | |
e27d73f6 DE |
396 | /* Either we're going to immediately resume the new thread |
397 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
398 | thinks the thread is currently running, so set this first | |
399 | before calling linux_resume_one_lwp. */ | |
400 | new_lwp->stopped = 1; | |
401 | ||
da5898ce DJ |
402 | /* Normally we will get the pending SIGSTOP. But in some cases |
403 | we might get another signal delivered to the group first. | |
f21cc1a2 | 404 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
405 | if (WSTOPSIG (status) == SIGSTOP) |
406 | { | |
d50171e4 PA |
407 | if (stopping_threads) |
408 | new_lwp->stop_pc = get_stop_pc (new_lwp); | |
409 | else | |
e27d73f6 | 410 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 411 | } |
24a09b5f | 412 | else |
da5898ce | 413 | { |
54a0b537 | 414 | new_lwp->stop_expected = 1; |
d50171e4 | 415 | |
da5898ce DJ |
416 | if (stopping_threads) |
417 | { | |
d50171e4 | 418 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
419 | new_lwp->status_pending_p = 1; |
420 | new_lwp->status_pending = status; | |
da5898ce DJ |
421 | } |
422 | else | |
423 | /* Pass the signal on. This is what GDB does - except | |
424 | shouldn't we really report it instead? */ | |
e27d73f6 | 425 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 426 | } |
24a09b5f DJ |
427 | |
428 | /* Always resume the current thread. If we are stopping | |
429 | threads, it will have a pending SIGSTOP; we may as well | |
430 | collect it now. */ | |
2acc282a | 431 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
432 | } |
433 | } | |
434 | ||
d50171e4 PA |
435 | /* Return the PC as read from the regcache of LWP, without any |
436 | adjustment. */ | |
437 | ||
438 | static CORE_ADDR | |
439 | get_pc (struct lwp_info *lwp) | |
440 | { | |
441 | struct thread_info *saved_inferior; | |
442 | struct regcache *regcache; | |
443 | CORE_ADDR pc; | |
444 | ||
445 | if (the_low_target.get_pc == NULL) | |
446 | return 0; | |
447 | ||
448 | saved_inferior = current_inferior; | |
449 | current_inferior = get_lwp_thread (lwp); | |
450 | ||
451 | regcache = get_thread_regcache (current_inferior, 1); | |
452 | pc = (*the_low_target.get_pc) (regcache); | |
453 | ||
454 | if (debug_threads) | |
455 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
456 | ||
457 | current_inferior = saved_inferior; | |
458 | return pc; | |
459 | } | |
460 | ||
461 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
462 | The SIGTRAP could mean several things. |
463 | ||
464 | On i386, where decr_pc_after_break is non-zero: | |
465 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
466 | we will get only the one SIGTRAP (even if the instruction we | |
467 | stepped over was a breakpoint). The value of $eip will be the | |
468 | next instruction. | |
469 | If we continue the process using PTRACE_CONT, we will get a | |
470 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
471 | the instruction after the breakpoint (i.e. needs to be | |
472 | decremented). If we report the SIGTRAP to GDB, we must also | |
473 | report the undecremented PC. If we cancel the SIGTRAP, we | |
474 | must resume at the decremented PC. | |
475 | ||
476 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
477 | with hardware or kernel single-step: | |
478 | If we single-step over a breakpoint instruction, our PC will | |
479 | point at the following instruction. If we continue and hit a | |
480 | breakpoint instruction, our PC will point at the breakpoint | |
481 | instruction. */ | |
482 | ||
483 | static CORE_ADDR | |
d50171e4 | 484 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 485 | { |
d50171e4 PA |
486 | CORE_ADDR stop_pc; |
487 | ||
488 | if (the_low_target.get_pc == NULL) | |
489 | return 0; | |
0d62e5e8 | 490 | |
d50171e4 PA |
491 | stop_pc = get_pc (lwp); |
492 | ||
bdabb078 PA |
493 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
494 | && !lwp->stepping | |
495 | && !lwp->stopped_by_watchpoint | |
496 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
497 | stop_pc -= the_low_target.decr_pc_after_break; |
498 | ||
499 | if (debug_threads) | |
500 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
501 | ||
502 | return stop_pc; | |
0d62e5e8 | 503 | } |
ce3a066d | 504 | |
0d62e5e8 | 505 | static void * |
95954743 | 506 | add_lwp (ptid_t ptid) |
611cb4a5 | 507 | { |
54a0b537 | 508 | struct lwp_info *lwp; |
0d62e5e8 | 509 | |
54a0b537 PA |
510 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
511 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 512 | |
95954743 | 513 | lwp->head.id = ptid; |
0d62e5e8 | 514 | |
aa5ca48f DE |
515 | if (the_low_target.new_thread != NULL) |
516 | lwp->arch_private = the_low_target.new_thread (); | |
517 | ||
54a0b537 | 518 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 519 | |
54a0b537 | 520 | return lwp; |
0d62e5e8 | 521 | } |
611cb4a5 | 522 | |
da6d8c04 DJ |
523 | /* Start an inferior process and returns its pid. |
524 | ALLARGS is a vector of program-name and args. */ | |
525 | ||
ce3a066d DJ |
526 | static int |
527 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 528 | { |
03583c20 UW |
529 | #ifdef HAVE_PERSONALITY |
530 | int personality_orig = 0, personality_set = 0; | |
531 | #endif | |
a6dbe5df | 532 | struct lwp_info *new_lwp; |
da6d8c04 | 533 | int pid; |
95954743 | 534 | ptid_t ptid; |
da6d8c04 | 535 | |
03583c20 UW |
536 | #ifdef HAVE_PERSONALITY |
537 | if (disable_randomization) | |
538 | { | |
539 | errno = 0; | |
540 | personality_orig = personality (0xffffffff); | |
541 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
542 | { | |
543 | personality_set = 1; | |
544 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
545 | } | |
546 | if (errno != 0 || (personality_set | |
547 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
548 | warning ("Error disabling address space randomization: %s", | |
549 | strerror (errno)); | |
550 | } | |
551 | #endif | |
552 | ||
42c81e2a | 553 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
554 | pid = vfork (); |
555 | #else | |
da6d8c04 | 556 | pid = fork (); |
52fb6437 | 557 | #endif |
da6d8c04 DJ |
558 | if (pid < 0) |
559 | perror_with_name ("fork"); | |
560 | ||
561 | if (pid == 0) | |
562 | { | |
563 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
564 | ||
1a981360 | 565 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 566 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 567 | #endif |
0d62e5e8 | 568 | |
a9fa9f7d DJ |
569 | setpgid (0, 0); |
570 | ||
e0f9f062 DE |
571 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
572 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
573 | Also, redirect stdin to /dev/null. */ | |
574 | if (remote_connection_is_stdio ()) | |
575 | { | |
576 | close (0); | |
577 | open ("/dev/null", O_RDONLY); | |
578 | dup2 (2, 1); | |
3e52c33d JK |
579 | if (write (2, "stdin/stdout redirected\n", |
580 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
581 | /* Errors ignored. */; | |
e0f9f062 DE |
582 | } |
583 | ||
2b876972 DJ |
584 | execv (program, allargs); |
585 | if (errno == ENOENT) | |
586 | execvp (program, allargs); | |
da6d8c04 DJ |
587 | |
588 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 589 | strerror (errno)); |
da6d8c04 DJ |
590 | fflush (stderr); |
591 | _exit (0177); | |
592 | } | |
593 | ||
03583c20 UW |
594 | #ifdef HAVE_PERSONALITY |
595 | if (personality_set) | |
596 | { | |
597 | errno = 0; | |
598 | personality (personality_orig); | |
599 | if (errno != 0) | |
600 | warning ("Error restoring address space randomization: %s", | |
601 | strerror (errno)); | |
602 | } | |
603 | #endif | |
604 | ||
95954743 PA |
605 | linux_add_process (pid, 0); |
606 | ||
607 | ptid = ptid_build (pid, pid, 0); | |
608 | new_lwp = add_lwp (ptid); | |
609 | add_thread (ptid, new_lwp); | |
a6dbe5df | 610 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 611 | |
a9fa9f7d | 612 | return pid; |
da6d8c04 DJ |
613 | } |
614 | ||
615 | /* Attach to an inferior process. */ | |
616 | ||
95954743 PA |
617 | static void |
618 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 619 | { |
95954743 | 620 | ptid_t ptid; |
54a0b537 | 621 | struct lwp_info *new_lwp; |
611cb4a5 | 622 | |
95954743 | 623 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 624 | { |
95954743 | 625 | if (!initial) |
2d717e4f DJ |
626 | { |
627 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 628 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
629 | strerror (errno), errno); |
630 | fflush (stderr); | |
631 | return; | |
632 | } | |
633 | else | |
634 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 635 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 636 | strerror (errno), errno); |
da6d8c04 DJ |
637 | } |
638 | ||
95954743 | 639 | if (initial) |
e3deef73 LM |
640 | /* If lwp is the tgid, we handle adding existing threads later. |
641 | Otherwise we just add lwp without bothering about any other | |
642 | threads. */ | |
95954743 PA |
643 | ptid = ptid_build (lwpid, lwpid, 0); |
644 | else | |
645 | { | |
646 | /* Note that extracting the pid from the current inferior is | |
647 | safe, since we're always called in the context of the same | |
648 | process as this new thread. */ | |
649 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
650 | ptid = ptid_build (pid, lwpid, 0); | |
651 | } | |
24a09b5f | 652 | |
95954743 PA |
653 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
654 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 655 | |
a6dbe5df PA |
656 | /* We need to wait for SIGSTOP before being able to make the next |
657 | ptrace call on this LWP. */ | |
658 | new_lwp->must_set_ptrace_flags = 1; | |
659 | ||
0d62e5e8 | 660 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
661 | brings it to a halt. |
662 | ||
663 | There are several cases to consider here: | |
664 | ||
665 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 666 | of a new thread that is being created. |
d50171e4 PA |
667 | In this case we should ignore that SIGSTOP and resume the |
668 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 669 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 670 | resume_continue. |
0e21c1ec DE |
671 | |
672 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
673 | to it via attach_inferior. |
674 | In this case we want the process thread to stop. | |
d50171e4 PA |
675 | This is handled by having linux_attach set last_resume_kind == |
676 | resume_stop after we return. | |
e3deef73 LM |
677 | |
678 | If the pid we are attaching to is also the tgid, we attach to and | |
679 | stop all the existing threads. Otherwise, we attach to pid and | |
680 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
681 | |
682 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
683 | existing threads. |
684 | In this case we want the thread to stop. | |
685 | FIXME: This case is currently not properly handled. | |
686 | We should wait for the SIGSTOP but don't. Things work apparently | |
687 | because enough time passes between when we ptrace (ATTACH) and when | |
688 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
689 | |
690 | On the other hand, if we are currently trying to stop all threads, we | |
691 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 692 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
693 | end of the list, and so the new thread has not yet reached |
694 | wait_for_sigstop (but will). */ | |
d50171e4 | 695 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
696 | } |
697 | ||
95954743 PA |
698 | void |
699 | linux_attach_lwp (unsigned long lwpid) | |
700 | { | |
701 | linux_attach_lwp_1 (lwpid, 0); | |
702 | } | |
703 | ||
e3deef73 LM |
704 | /* Attach to PID. If PID is the tgid, attach to it and all |
705 | of its threads. */ | |
706 | ||
0d62e5e8 | 707 | int |
a1928bad | 708 | linux_attach (unsigned long pid) |
0d62e5e8 | 709 | { |
e3deef73 LM |
710 | /* Attach to PID. We will check for other threads |
711 | soon. */ | |
95954743 | 712 | linux_attach_lwp_1 (pid, 1); |
95954743 | 713 | linux_add_process (pid, 1); |
0d62e5e8 | 714 | |
bd99dc85 PA |
715 | if (!non_stop) |
716 | { | |
8336d594 PA |
717 | struct thread_info *thread; |
718 | ||
719 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
720 | process. It will be collected by wait shortly. */ | |
721 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
722 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 723 | } |
0d62e5e8 | 724 | |
e3deef73 LM |
725 | if (linux_proc_get_tgid (pid) == pid) |
726 | { | |
727 | DIR *dir; | |
728 | char pathname[128]; | |
729 | ||
730 | sprintf (pathname, "/proc/%ld/task", pid); | |
731 | ||
732 | dir = opendir (pathname); | |
733 | ||
734 | if (!dir) | |
735 | { | |
736 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
737 | fflush (stderr); | |
738 | } | |
739 | else | |
740 | { | |
741 | /* At this point we attached to the tgid. Scan the task for | |
742 | existing threads. */ | |
743 | unsigned long lwp; | |
744 | int new_threads_found; | |
745 | int iterations = 0; | |
746 | struct dirent *dp; | |
747 | ||
748 | while (iterations < 2) | |
749 | { | |
750 | new_threads_found = 0; | |
751 | /* Add all the other threads. While we go through the | |
752 | threads, new threads may be spawned. Cycle through | |
753 | the list of threads until we have done two iterations without | |
754 | finding new threads. */ | |
755 | while ((dp = readdir (dir)) != NULL) | |
756 | { | |
757 | /* Fetch one lwp. */ | |
758 | lwp = strtoul (dp->d_name, NULL, 10); | |
759 | ||
760 | /* Is this a new thread? */ | |
761 | if (lwp | |
762 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
763 | { | |
764 | linux_attach_lwp_1 (lwp, 0); | |
765 | new_threads_found++; | |
766 | ||
767 | if (debug_threads) | |
768 | fprintf (stderr, "\ | |
769 | Found and attached to new lwp %ld\n", lwp); | |
770 | } | |
771 | } | |
772 | ||
773 | if (!new_threads_found) | |
774 | iterations++; | |
775 | else | |
776 | iterations = 0; | |
777 | ||
778 | rewinddir (dir); | |
779 | } | |
780 | closedir (dir); | |
781 | } | |
782 | } | |
783 | ||
95954743 PA |
784 | return 0; |
785 | } | |
786 | ||
787 | struct counter | |
788 | { | |
789 | int pid; | |
790 | int count; | |
791 | }; | |
792 | ||
793 | static int | |
794 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
795 | { | |
796 | struct counter *counter = args; | |
797 | ||
798 | if (ptid_get_pid (entry->id) == counter->pid) | |
799 | { | |
800 | if (++counter->count > 1) | |
801 | return 1; | |
802 | } | |
d61ddec4 | 803 | |
da6d8c04 DJ |
804 | return 0; |
805 | } | |
806 | ||
95954743 PA |
807 | static int |
808 | last_thread_of_process_p (struct thread_info *thread) | |
809 | { | |
810 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
811 | int pid = ptid_get_pid (ptid); | |
812 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 813 | |
95954743 PA |
814 | return (find_inferior (&all_threads, |
815 | second_thread_of_pid_p, &counter) == NULL); | |
816 | } | |
817 | ||
818 | /* Kill the inferior lwp. */ | |
819 | ||
820 | static int | |
821 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 822 | { |
0d62e5e8 | 823 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 824 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 825 | int wstat; |
95954743 PA |
826 | int pid = * (int *) args; |
827 | ||
828 | if (ptid_get_pid (entry->id) != pid) | |
829 | return 0; | |
0d62e5e8 | 830 | |
fd500816 DJ |
831 | /* We avoid killing the first thread here, because of a Linux kernel (at |
832 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
833 | the children get a chance to be reaped, it will remain a zombie | |
834 | forever. */ | |
95954743 | 835 | |
12b42a12 | 836 | if (lwpid_of (lwp) == pid) |
95954743 PA |
837 | { |
838 | if (debug_threads) | |
839 | fprintf (stderr, "lkop: is last of process %s\n", | |
840 | target_pid_to_str (entry->id)); | |
841 | return 0; | |
842 | } | |
fd500816 | 843 | |
0d62e5e8 DJ |
844 | do |
845 | { | |
bd99dc85 | 846 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
847 | |
848 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 849 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 850 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
851 | |
852 | return 0; | |
da6d8c04 DJ |
853 | } |
854 | ||
95954743 PA |
855 | static int |
856 | linux_kill (int pid) | |
0d62e5e8 | 857 | { |
95954743 | 858 | struct process_info *process; |
54a0b537 | 859 | struct lwp_info *lwp; |
fd500816 | 860 | int wstat; |
95954743 | 861 | int lwpid; |
fd500816 | 862 | |
95954743 PA |
863 | process = find_process_pid (pid); |
864 | if (process == NULL) | |
865 | return -1; | |
9d606399 | 866 | |
f9e39928 PA |
867 | /* If we're killing a running inferior, make sure it is stopped |
868 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 869 | stop_all_lwps (0, NULL); |
f9e39928 | 870 | |
95954743 | 871 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 872 | |
54a0b537 | 873 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 874 | thread in the list, so do so now. */ |
95954743 | 875 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 876 | |
784867a5 | 877 | if (lwp == NULL) |
fd500816 | 878 | { |
784867a5 JK |
879 | if (debug_threads) |
880 | fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n", | |
881 | lwpid_of (lwp), pid); | |
882 | } | |
883 | else | |
884 | { | |
885 | if (debug_threads) | |
886 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", | |
887 | lwpid_of (lwp), pid); | |
fd500816 | 888 | |
784867a5 JK |
889 | do |
890 | { | |
891 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); | |
892 | ||
893 | /* Make sure it died. The loop is most likely unnecessary. */ | |
894 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); | |
895 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
896 | } | |
2d717e4f | 897 | |
8336d594 | 898 | the_target->mourn (process); |
f9e39928 PA |
899 | |
900 | /* Since we presently can only stop all lwps of all processes, we | |
901 | need to unstop lwps of other processes. */ | |
7984d532 | 902 | unstop_all_lwps (0, NULL); |
95954743 | 903 | return 0; |
0d62e5e8 DJ |
904 | } |
905 | ||
95954743 PA |
906 | static int |
907 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
908 | { |
909 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 910 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
911 | int pid = * (int *) args; |
912 | ||
913 | if (ptid_get_pid (entry->id) != pid) | |
914 | return 0; | |
6ad8ae5c | 915 | |
ae13219e DJ |
916 | /* If this process is stopped but is expecting a SIGSTOP, then make |
917 | sure we take care of that now. This isn't absolutely guaranteed | |
918 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 919 | if (lwp->stop_expected) |
ae13219e | 920 | { |
bd99dc85 | 921 | int wstat; |
ae13219e | 922 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 | 923 | lwp->stop_expected = 0; |
f9e39928 | 924 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 925 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
926 | } |
927 | ||
928 | /* Flush any pending changes to the process's registers. */ | |
929 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 930 | get_lwp_thread (lwp)); |
ae13219e DJ |
931 | |
932 | /* Finally, let it resume. */ | |
82bfbe7e PA |
933 | if (the_low_target.prepare_to_resume != NULL) |
934 | the_low_target.prepare_to_resume (lwp); | |
bd99dc85 PA |
935 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
936 | ||
937 | delete_lwp (lwp); | |
95954743 | 938 | return 0; |
6ad8ae5c DJ |
939 | } |
940 | ||
95954743 PA |
941 | static int |
942 | linux_detach (int pid) | |
943 | { | |
944 | struct process_info *process; | |
945 | ||
946 | process = find_process_pid (pid); | |
947 | if (process == NULL) | |
948 | return -1; | |
949 | ||
f9e39928 PA |
950 | /* Stop all threads before detaching. First, ptrace requires that |
951 | the thread is stopped to sucessfully detach. Second, thread_db | |
952 | may need to uninstall thread event breakpoints from memory, which | |
953 | only works with a stopped process anyway. */ | |
7984d532 | 954 | stop_all_lwps (0, NULL); |
f9e39928 | 955 | |
ca5c370d | 956 | #ifdef USE_THREAD_DB |
8336d594 | 957 | thread_db_detach (process); |
ca5c370d PA |
958 | #endif |
959 | ||
fa593d66 PA |
960 | /* Stabilize threads (move out of jump pads). */ |
961 | stabilize_threads (); | |
962 | ||
95954743 | 963 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
964 | |
965 | the_target->mourn (process); | |
f9e39928 PA |
966 | |
967 | /* Since we presently can only stop all lwps of all processes, we | |
968 | need to unstop lwps of other processes. */ | |
7984d532 | 969 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
970 | return 0; |
971 | } | |
972 | ||
973 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
974 | ||
975 | static int | |
976 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
977 | { | |
978 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
979 | struct process_info *process = proc; | |
980 | ||
981 | if (pid_of (lwp) == pid_of (process)) | |
982 | delete_lwp (lwp); | |
983 | ||
dd6953e1 | 984 | return 0; |
6ad8ae5c DJ |
985 | } |
986 | ||
8336d594 PA |
987 | static void |
988 | linux_mourn (struct process_info *process) | |
989 | { | |
990 | struct process_info_private *priv; | |
991 | ||
992 | #ifdef USE_THREAD_DB | |
993 | thread_db_mourn (process); | |
994 | #endif | |
995 | ||
f9e39928 PA |
996 | find_inferior (&all_lwps, delete_lwp_callback, process); |
997 | ||
8336d594 PA |
998 | /* Freeing all private data. */ |
999 | priv = process->private; | |
1000 | free (priv->arch_private); | |
1001 | free (priv); | |
1002 | process->private = NULL; | |
505106cd PA |
1003 | |
1004 | remove_process (process); | |
8336d594 PA |
1005 | } |
1006 | ||
444d6139 | 1007 | static void |
95954743 | 1008 | linux_join (int pid) |
444d6139 | 1009 | { |
444d6139 PA |
1010 | int status, ret; |
1011 | ||
1012 | do { | |
95954743 | 1013 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1014 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1015 | break; | |
1016 | } while (ret != -1 || errno != ECHILD); | |
1017 | } | |
1018 | ||
6ad8ae5c | 1019 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1020 | static int |
95954743 | 1021 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1022 | { |
95954743 PA |
1023 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1024 | ||
1025 | /* We assume we always know if a thread exits. If a whole process | |
1026 | exited but we still haven't been able to report it to GDB, we'll | |
1027 | hold on to the last lwp of the dead process. */ | |
1028 | if (lwp != NULL) | |
1029 | return !lwp->dead; | |
0d62e5e8 DJ |
1030 | else |
1031 | return 0; | |
1032 | } | |
1033 | ||
6bf5e0ba | 1034 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1035 | static int |
d50171e4 | 1036 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1037 | { |
54a0b537 | 1038 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1039 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1040 | struct thread_info *thread; |
95954743 PA |
1041 | |
1042 | /* Check if we're only interested in events from a specific process | |
1043 | or its lwps. */ | |
1044 | if (!ptid_equal (minus_one_ptid, ptid) | |
1045 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
1046 | return 0; | |
0d62e5e8 | 1047 | |
d50171e4 PA |
1048 | thread = get_lwp_thread (lwp); |
1049 | ||
1050 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1051 | report any status pending the LWP may have. */ | |
8336d594 | 1052 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1053 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1054 | return 0; |
0d62e5e8 | 1055 | |
d50171e4 | 1056 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1057 | } |
1058 | ||
95954743 PA |
1059 | static int |
1060 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1061 | { | |
1062 | ptid_t ptid = *(ptid_t *) data; | |
1063 | int lwp; | |
1064 | ||
1065 | if (ptid_get_lwp (ptid) != 0) | |
1066 | lwp = ptid_get_lwp (ptid); | |
1067 | else | |
1068 | lwp = ptid_get_pid (ptid); | |
1069 | ||
1070 | if (ptid_get_lwp (entry->id) == lwp) | |
1071 | return 1; | |
1072 | ||
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | struct lwp_info * | |
1077 | find_lwp_pid (ptid_t ptid) | |
1078 | { | |
1079 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1080 | } | |
1081 | ||
bd99dc85 | 1082 | static struct lwp_info * |
95954743 | 1083 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1084 | { |
0d62e5e8 | 1085 | int ret; |
95954743 | 1086 | int to_wait_for = -1; |
bd99dc85 | 1087 | struct lwp_info *child = NULL; |
0d62e5e8 | 1088 | |
bd99dc85 | 1089 | if (debug_threads) |
95954743 PA |
1090 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1091 | ||
1092 | if (ptid_equal (ptid, minus_one_ptid)) | |
1093 | to_wait_for = -1; /* any child */ | |
1094 | else | |
1095 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1096 | |
bd99dc85 | 1097 | options |= __WALL; |
0d62e5e8 | 1098 | |
bd99dc85 | 1099 | retry: |
0d62e5e8 | 1100 | |
bd99dc85 PA |
1101 | ret = my_waitpid (to_wait_for, wstatp, options); |
1102 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1103 | return NULL; | |
1104 | else if (ret == -1) | |
1105 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1106 | |
1107 | if (debug_threads | |
1108 | && (!WIFSTOPPED (*wstatp) | |
1109 | || (WSTOPSIG (*wstatp) != 32 | |
1110 | && WSTOPSIG (*wstatp) != 33))) | |
1111 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1112 | ||
95954743 | 1113 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1114 | |
24a09b5f DJ |
1115 | /* If we didn't find a process, one of two things presumably happened: |
1116 | - A process we started and then detached from has exited. Ignore it. | |
1117 | - A process we are controlling has forked and the new child's stop | |
1118 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1119 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1120 | { |
1121 | add_pid_to_list (&stopped_pids, ret); | |
1122 | goto retry; | |
1123 | } | |
bd99dc85 | 1124 | else if (child == NULL) |
24a09b5f DJ |
1125 | goto retry; |
1126 | ||
bd99dc85 | 1127 | child->stopped = 1; |
0d62e5e8 | 1128 | |
bd99dc85 | 1129 | child->last_status = *wstatp; |
32ca6d61 | 1130 | |
d61ddec4 UW |
1131 | /* Architecture-specific setup after inferior is running. |
1132 | This needs to happen after we have attached to the inferior | |
1133 | and it is stopped for the first time, but before we access | |
1134 | any inferior registers. */ | |
1135 | if (new_inferior) | |
1136 | { | |
1137 | the_low_target.arch_setup (); | |
52fa2412 UW |
1138 | #ifdef HAVE_LINUX_REGSETS |
1139 | memset (disabled_regsets, 0, num_regsets); | |
1140 | #endif | |
d61ddec4 UW |
1141 | new_inferior = 0; |
1142 | } | |
1143 | ||
c3adc08c PA |
1144 | /* Fetch the possibly triggered data watchpoint info and store it in |
1145 | CHILD. | |
1146 | ||
1147 | On some archs, like x86, that use debug registers to set | |
1148 | watchpoints, it's possible that the way to know which watched | |
1149 | address trapped, is to check the register that is used to select | |
1150 | which address to watch. Problem is, between setting the | |
1151 | watchpoint and reading back which data address trapped, the user | |
1152 | may change the set of watchpoints, and, as a consequence, GDB | |
1153 | changes the debug registers in the inferior. To avoid reading | |
1154 | back a stale stopped-data-address when that happens, we cache in | |
1155 | LP the fact that a watchpoint trapped, and the corresponding data | |
1156 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1157 | changes the debug registers meanwhile, we have the cached data we | |
1158 | can rely on. */ | |
1159 | ||
1160 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1161 | { | |
1162 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1163 | { | |
1164 | child->stopped_by_watchpoint = 0; | |
1165 | } | |
1166 | else | |
1167 | { | |
1168 | struct thread_info *saved_inferior; | |
1169 | ||
1170 | saved_inferior = current_inferior; | |
1171 | current_inferior = get_lwp_thread (child); | |
1172 | ||
1173 | child->stopped_by_watchpoint | |
1174 | = the_low_target.stopped_by_watchpoint (); | |
1175 | ||
1176 | if (child->stopped_by_watchpoint) | |
1177 | { | |
1178 | if (the_low_target.stopped_data_address != NULL) | |
1179 | child->stopped_data_address | |
1180 | = the_low_target.stopped_data_address (); | |
1181 | else | |
1182 | child->stopped_data_address = 0; | |
1183 | } | |
1184 | ||
1185 | current_inferior = saved_inferior; | |
1186 | } | |
1187 | } | |
1188 | ||
d50171e4 PA |
1189 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1190 | architecture being defined already (so that CHILD has a valid | |
1191 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1192 | not). */ | |
1193 | if (WIFSTOPPED (*wstatp)) | |
1194 | child->stop_pc = get_stop_pc (child); | |
1195 | ||
0d62e5e8 | 1196 | if (debug_threads |
47c0c975 DE |
1197 | && WIFSTOPPED (*wstatp) |
1198 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1199 | { |
896c7fbb | 1200 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1201 | struct regcache *regcache; |
47c0c975 DE |
1202 | CORE_ADDR pc; |
1203 | ||
d50171e4 | 1204 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1205 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1206 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1207 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1208 | current_inferior = saved_inferior; |
0d62e5e8 | 1209 | } |
bd99dc85 PA |
1210 | |
1211 | return child; | |
0d62e5e8 | 1212 | } |
611cb4a5 | 1213 | |
219f2f23 PA |
1214 | /* This function should only be called if the LWP got a SIGTRAP. |
1215 | ||
1216 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1217 | event was handled, 0 otherwise. */ | |
1218 | ||
1219 | static int | |
1220 | handle_tracepoints (struct lwp_info *lwp) | |
1221 | { | |
1222 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1223 | int tpoint_related_event = 0; | |
1224 | ||
7984d532 PA |
1225 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1226 | uninsert tracepoints. To do this, we temporarily pause all | |
1227 | threads, unpatch away, and then unpause threads. We need to make | |
1228 | sure the unpausing doesn't resume LWP too. */ | |
1229 | lwp->suspended++; | |
1230 | ||
219f2f23 PA |
1231 | /* And we need to be sure that any all-threads-stopping doesn't try |
1232 | to move threads out of the jump pads, as it could deadlock the | |
1233 | inferior (LWP could be in the jump pad, maybe even holding the | |
1234 | lock.) */ | |
1235 | ||
1236 | /* Do any necessary step collect actions. */ | |
1237 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1238 | ||
fa593d66 PA |
1239 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1240 | ||
219f2f23 PA |
1241 | /* See if we just hit a tracepoint and do its main collect |
1242 | actions. */ | |
1243 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1244 | ||
7984d532 PA |
1245 | lwp->suspended--; |
1246 | ||
1247 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1248 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1249 | |
219f2f23 PA |
1250 | if (tpoint_related_event) |
1251 | { | |
1252 | if (debug_threads) | |
1253 | fprintf (stderr, "got a tracepoint event\n"); | |
1254 | return 1; | |
1255 | } | |
1256 | ||
1257 | return 0; | |
1258 | } | |
1259 | ||
fa593d66 PA |
1260 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1261 | fast tracepoint. */ | |
1262 | ||
1263 | static int | |
1264 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1265 | struct fast_tpoint_collect_status *status) | |
1266 | { | |
1267 | CORE_ADDR thread_area; | |
1268 | ||
1269 | if (the_low_target.get_thread_area == NULL) | |
1270 | return 0; | |
1271 | ||
1272 | /* Get the thread area address. This is used to recognize which | |
1273 | thread is which when tracing with the in-process agent library. | |
1274 | We don't read anything from the address, and treat it as opaque; | |
1275 | it's the address itself that we assume is unique per-thread. */ | |
1276 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1277 | return 0; | |
1278 | ||
1279 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1280 | } | |
1281 | ||
1282 | /* The reason we resume in the caller, is because we want to be able | |
1283 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1284 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1285 | refuses to resume. */ | |
1286 | ||
1287 | static int | |
1288 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1289 | { | |
1290 | struct thread_info *saved_inferior; | |
1291 | ||
1292 | saved_inferior = current_inferior; | |
1293 | current_inferior = get_lwp_thread (lwp); | |
1294 | ||
1295 | if ((wstat == NULL | |
1296 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1297 | && supports_fast_tracepoints () | |
1298 | && in_process_agent_loaded ()) | |
1299 | { | |
1300 | struct fast_tpoint_collect_status status; | |
1301 | int r; | |
1302 | ||
1303 | if (debug_threads) | |
1304 | fprintf (stderr, "\ | |
1305 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1306 | lwpid_of (lwp)); | |
1307 | ||
1308 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1309 | ||
1310 | if (wstat == NULL | |
1311 | || (WSTOPSIG (*wstat) != SIGILL | |
1312 | && WSTOPSIG (*wstat) != SIGFPE | |
1313 | && WSTOPSIG (*wstat) != SIGSEGV | |
1314 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1315 | { | |
1316 | lwp->collecting_fast_tracepoint = r; | |
1317 | ||
1318 | if (r != 0) | |
1319 | { | |
1320 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1321 | { | |
1322 | /* Haven't executed the original instruction yet. | |
1323 | Set breakpoint there, and wait till it's hit, | |
1324 | then single-step until exiting the jump pad. */ | |
1325 | lwp->exit_jump_pad_bkpt | |
1326 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1327 | } | |
1328 | ||
1329 | if (debug_threads) | |
1330 | fprintf (stderr, "\ | |
1331 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1332 | lwpid_of (lwp)); | |
0cccb683 | 1333 | current_inferior = saved_inferior; |
fa593d66 PA |
1334 | |
1335 | return 1; | |
1336 | } | |
1337 | } | |
1338 | else | |
1339 | { | |
1340 | /* If we get a synchronous signal while collecting, *and* | |
1341 | while executing the (relocated) original instruction, | |
1342 | reset the PC to point at the tpoint address, before | |
1343 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1344 | report the signal to GDB, and pray for the best. */ | |
1345 | ||
1346 | lwp->collecting_fast_tracepoint = 0; | |
1347 | ||
1348 | if (r != 0 | |
1349 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1350 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1351 | { | |
1352 | siginfo_t info; | |
1353 | struct regcache *regcache; | |
1354 | ||
1355 | /* The si_addr on a few signals references the address | |
1356 | of the faulting instruction. Adjust that as | |
1357 | well. */ | |
1358 | if ((WSTOPSIG (*wstat) == SIGILL | |
1359 | || WSTOPSIG (*wstat) == SIGFPE | |
1360 | || WSTOPSIG (*wstat) == SIGBUS | |
1361 | || WSTOPSIG (*wstat) == SIGSEGV) | |
1362 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &info) == 0 | |
1363 | /* Final check just to make sure we don't clobber | |
1364 | the siginfo of non-kernel-sent signals. */ | |
1365 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1366 | { | |
1367 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
1368 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &info); | |
1369 | } | |
1370 | ||
1371 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1372 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1373 | lwp->stop_pc = status.tpoint_addr; | |
1374 | ||
1375 | /* Cancel any fast tracepoint lock this thread was | |
1376 | holding. */ | |
1377 | force_unlock_trace_buffer (); | |
1378 | } | |
1379 | ||
1380 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1381 | { | |
1382 | if (debug_threads) | |
1383 | fprintf (stderr, | |
1384 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1385 | "stopping all threads momentarily.\n"); | |
1386 | ||
1387 | stop_all_lwps (1, lwp); | |
1388 | cancel_breakpoints (); | |
1389 | ||
1390 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1391 | lwp->exit_jump_pad_bkpt = NULL; | |
1392 | ||
1393 | unstop_all_lwps (1, lwp); | |
1394 | ||
1395 | gdb_assert (lwp->suspended >= 0); | |
1396 | } | |
1397 | } | |
1398 | } | |
1399 | ||
1400 | if (debug_threads) | |
1401 | fprintf (stderr, "\ | |
1402 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1403 | lwpid_of (lwp)); | |
0cccb683 YQ |
1404 | |
1405 | current_inferior = saved_inferior; | |
fa593d66 PA |
1406 | return 0; |
1407 | } | |
1408 | ||
1409 | /* Enqueue one signal in the "signals to report later when out of the | |
1410 | jump pad" list. */ | |
1411 | ||
1412 | static void | |
1413 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1414 | { | |
1415 | struct pending_signals *p_sig; | |
1416 | ||
1417 | if (debug_threads) | |
1418 | fprintf (stderr, "\ | |
1419 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1420 | ||
1421 | if (debug_threads) | |
1422 | { | |
1423 | struct pending_signals *sig; | |
1424 | ||
1425 | for (sig = lwp->pending_signals_to_report; | |
1426 | sig != NULL; | |
1427 | sig = sig->prev) | |
1428 | fprintf (stderr, | |
1429 | " Already queued %d\n", | |
1430 | sig->signal); | |
1431 | ||
1432 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1433 | } | |
1434 | ||
1a981360 PA |
1435 | /* Don't enqueue non-RT signals if they are already in the deferred |
1436 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1437 | twice) */ | |
1438 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1439 | { | |
1440 | struct pending_signals *sig; | |
1441 | ||
1442 | for (sig = lwp->pending_signals_to_report; | |
1443 | sig != NULL; | |
1444 | sig = sig->prev) | |
1445 | { | |
1446 | if (sig->signal == WSTOPSIG (*wstat)) | |
1447 | { | |
1448 | if (debug_threads) | |
1449 | fprintf (stderr, | |
1450 | "Not requeuing already queued non-RT signal %d" | |
1451 | " for LWP %ld\n", | |
1452 | sig->signal, | |
1453 | lwpid_of (lwp)); | |
1454 | return; | |
1455 | } | |
1456 | } | |
1457 | } | |
1458 | ||
fa593d66 PA |
1459 | p_sig = xmalloc (sizeof (*p_sig)); |
1460 | p_sig->prev = lwp->pending_signals_to_report; | |
1461 | p_sig->signal = WSTOPSIG (*wstat); | |
1462 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1463 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1464 | ||
1465 | lwp->pending_signals_to_report = p_sig; | |
1466 | } | |
1467 | ||
1468 | /* Dequeue one signal from the "signals to report later when out of | |
1469 | the jump pad" list. */ | |
1470 | ||
1471 | static int | |
1472 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1473 | { | |
1474 | if (lwp->pending_signals_to_report != NULL) | |
1475 | { | |
1476 | struct pending_signals **p_sig; | |
1477 | ||
1478 | p_sig = &lwp->pending_signals_to_report; | |
1479 | while ((*p_sig)->prev != NULL) | |
1480 | p_sig = &(*p_sig)->prev; | |
1481 | ||
1482 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1483 | if ((*p_sig)->info.si_signo != 0) | |
1484 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); | |
1485 | free (*p_sig); | |
1486 | *p_sig = NULL; | |
1487 | ||
1488 | if (debug_threads) | |
1489 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1490 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1491 | ||
1492 | if (debug_threads) | |
1493 | { | |
1494 | struct pending_signals *sig; | |
1495 | ||
1496 | for (sig = lwp->pending_signals_to_report; | |
1497 | sig != NULL; | |
1498 | sig = sig->prev) | |
1499 | fprintf (stderr, | |
1500 | " Still queued %d\n", | |
1501 | sig->signal); | |
1502 | ||
1503 | fprintf (stderr, " (no more queued signals)\n"); | |
1504 | } | |
1505 | ||
1506 | return 1; | |
1507 | } | |
1508 | ||
1509 | return 0; | |
1510 | } | |
1511 | ||
d50171e4 PA |
1512 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1513 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1514 | will handle the current event, eventually we will resume this LWP, | |
1515 | and this breakpoint will trap again. */ | |
1516 | ||
1517 | static int | |
1518 | cancel_breakpoint (struct lwp_info *lwp) | |
1519 | { | |
1520 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1521 | |
1522 | /* There's nothing to do if we don't support breakpoints. */ | |
1523 | if (!supports_breakpoints ()) | |
1524 | return 0; | |
1525 | ||
d50171e4 PA |
1526 | /* breakpoint_at reads from current inferior. */ |
1527 | saved_inferior = current_inferior; | |
1528 | current_inferior = get_lwp_thread (lwp); | |
1529 | ||
1530 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1531 | { | |
1532 | if (debug_threads) | |
1533 | fprintf (stderr, | |
1534 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1535 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1536 | |
1537 | /* Back up the PC if necessary. */ | |
1538 | if (the_low_target.decr_pc_after_break) | |
1539 | { | |
1540 | struct regcache *regcache | |
fc7238bb | 1541 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1542 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1543 | } | |
1544 | ||
1545 | current_inferior = saved_inferior; | |
1546 | return 1; | |
1547 | } | |
1548 | else | |
1549 | { | |
1550 | if (debug_threads) | |
1551 | fprintf (stderr, | |
1552 | "CB: No breakpoint found at %s for [%s]\n", | |
1553 | paddress (lwp->stop_pc), | |
fc7238bb | 1554 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1555 | } |
1556 | ||
1557 | current_inferior = saved_inferior; | |
1558 | return 0; | |
1559 | } | |
1560 | ||
1561 | /* When the event-loop is doing a step-over, this points at the thread | |
1562 | being stepped. */ | |
1563 | ptid_t step_over_bkpt; | |
1564 | ||
bd99dc85 PA |
1565 | /* Wait for an event from child PID. If PID is -1, wait for any |
1566 | child. Store the stop status through the status pointer WSTAT. | |
1567 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1568 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1569 | the stopped child otherwise. */ | |
1570 | ||
0d62e5e8 | 1571 | static int |
95954743 | 1572 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1573 | { |
d50171e4 PA |
1574 | struct lwp_info *event_child, *requested_child; |
1575 | ||
d50171e4 PA |
1576 | event_child = NULL; |
1577 | requested_child = NULL; | |
0d62e5e8 | 1578 | |
95954743 | 1579 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1580 | |
95954743 PA |
1581 | if (ptid_equal (ptid, minus_one_ptid) |
1582 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1583 | { |
54a0b537 | 1584 | event_child = (struct lwp_info *) |
d50171e4 | 1585 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1586 | if (debug_threads && event_child) |
bd99dc85 | 1587 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1588 | } |
1589 | else | |
1590 | { | |
95954743 | 1591 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1592 | |
fa593d66 PA |
1593 | if (!stopping_threads |
1594 | && requested_child->status_pending_p | |
1595 | && requested_child->collecting_fast_tracepoint) | |
1596 | { | |
1597 | enqueue_one_deferred_signal (requested_child, | |
1598 | &requested_child->status_pending); | |
1599 | requested_child->status_pending_p = 0; | |
1600 | requested_child->status_pending = 0; | |
1601 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1602 | } | |
1603 | ||
1604 | if (requested_child->suspended | |
1605 | && requested_child->status_pending_p) | |
1606 | fatal ("requesting an event out of a suspended child?"); | |
1607 | ||
d50171e4 | 1608 | if (requested_child->status_pending_p) |
bd99dc85 | 1609 | event_child = requested_child; |
0d62e5e8 | 1610 | } |
611cb4a5 | 1611 | |
0d62e5e8 DJ |
1612 | if (event_child != NULL) |
1613 | { | |
bd99dc85 PA |
1614 | if (debug_threads) |
1615 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1616 | lwpid_of (event_child), event_child->status_pending); | |
1617 | *wstat = event_child->status_pending; | |
1618 | event_child->status_pending_p = 0; | |
1619 | event_child->status_pending = 0; | |
1620 | current_inferior = get_lwp_thread (event_child); | |
1621 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1622 | } |
1623 | ||
1624 | /* We only enter this loop if no process has a pending wait status. Thus | |
1625 | any action taken in response to a wait status inside this loop is | |
1626 | responding as soon as we detect the status, not after any pending | |
1627 | events. */ | |
1628 | while (1) | |
1629 | { | |
6bf5e0ba | 1630 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1631 | |
bd99dc85 | 1632 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1633 | { |
1634 | if (debug_threads) | |
1635 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1636 | return 0; | |
1637 | } | |
0d62e5e8 DJ |
1638 | |
1639 | if (event_child == NULL) | |
1640 | error ("event from unknown child"); | |
611cb4a5 | 1641 | |
bd99dc85 | 1642 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1643 | |
89be2091 | 1644 | /* Check for thread exit. */ |
bd99dc85 | 1645 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1646 | { |
89be2091 | 1647 | if (debug_threads) |
95954743 | 1648 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1649 | |
1650 | /* If the last thread is exiting, just return. */ | |
95954743 | 1651 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1652 | { |
1653 | if (debug_threads) | |
95954743 PA |
1654 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1655 | lwpid_of (event_child)); | |
bd99dc85 PA |
1656 | return lwpid_of (event_child); |
1657 | } | |
89be2091 | 1658 | |
bd99dc85 PA |
1659 | if (!non_stop) |
1660 | { | |
1661 | current_inferior = (struct thread_info *) all_threads.head; | |
1662 | if (debug_threads) | |
1663 | fprintf (stderr, "Current inferior is now %ld\n", | |
1664 | lwpid_of (get_thread_lwp (current_inferior))); | |
1665 | } | |
1666 | else | |
1667 | { | |
1668 | current_inferior = NULL; | |
1669 | if (debug_threads) | |
1670 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1671 | } | |
89be2091 DJ |
1672 | |
1673 | /* If we were waiting for this particular child to do something... | |
1674 | well, it did something. */ | |
bd99dc85 | 1675 | if (requested_child != NULL) |
d50171e4 PA |
1676 | { |
1677 | int lwpid = lwpid_of (event_child); | |
1678 | ||
1679 | /* Cancel the step-over operation --- the thread that | |
1680 | started it is gone. */ | |
1681 | if (finish_step_over (event_child)) | |
7984d532 | 1682 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1683 | delete_lwp (event_child); |
1684 | return lwpid; | |
1685 | } | |
1686 | ||
1687 | delete_lwp (event_child); | |
89be2091 DJ |
1688 | |
1689 | /* Wait for a more interesting event. */ | |
1690 | continue; | |
1691 | } | |
1692 | ||
a6dbe5df PA |
1693 | if (event_child->must_set_ptrace_flags) |
1694 | { | |
1e7fc18c | 1695 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1696 | event_child->must_set_ptrace_flags = 0; |
1697 | } | |
1698 | ||
bd99dc85 PA |
1699 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1700 | && *wstat >> 16 != 0) | |
24a09b5f | 1701 | { |
bd99dc85 | 1702 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1703 | continue; |
1704 | } | |
1705 | ||
d50171e4 PA |
1706 | if (WIFSTOPPED (*wstat) |
1707 | && WSTOPSIG (*wstat) == SIGSTOP | |
1708 | && event_child->stop_expected) | |
1709 | { | |
1710 | int should_stop; | |
1711 | ||
1712 | if (debug_threads) | |
1713 | fprintf (stderr, "Expected stop.\n"); | |
1714 | event_child->stop_expected = 0; | |
1715 | ||
8336d594 | 1716 | should_stop = (current_inferior->last_resume_kind == resume_stop |
d50171e4 PA |
1717 | || stopping_threads); |
1718 | ||
1719 | if (!should_stop) | |
1720 | { | |
1721 | linux_resume_one_lwp (event_child, | |
1722 | event_child->stepping, 0, NULL); | |
1723 | continue; | |
1724 | } | |
1725 | } | |
1726 | ||
bd99dc85 | 1727 | return lwpid_of (event_child); |
611cb4a5 | 1728 | } |
0d62e5e8 | 1729 | |
611cb4a5 DJ |
1730 | /* NOTREACHED */ |
1731 | return 0; | |
1732 | } | |
1733 | ||
95954743 PA |
1734 | static int |
1735 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1736 | { | |
1737 | ptid_t wait_ptid; | |
1738 | ||
1739 | if (ptid_is_pid (ptid)) | |
1740 | { | |
1741 | /* A request to wait for a specific tgid. This is not possible | |
1742 | with waitpid, so instead, we wait for any child, and leave | |
1743 | children we're not interested in right now with a pending | |
1744 | status to report later. */ | |
1745 | wait_ptid = minus_one_ptid; | |
1746 | } | |
1747 | else | |
1748 | wait_ptid = ptid; | |
1749 | ||
1750 | while (1) | |
1751 | { | |
1752 | int event_pid; | |
1753 | ||
1754 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1755 | ||
1756 | if (event_pid > 0 | |
1757 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1758 | { | |
493e2a69 MS |
1759 | struct lwp_info *event_child |
1760 | = find_lwp_pid (pid_to_ptid (event_pid)); | |
95954743 PA |
1761 | |
1762 | if (! WIFSTOPPED (*wstat)) | |
1763 | mark_lwp_dead (event_child, *wstat); | |
1764 | else | |
1765 | { | |
1766 | event_child->status_pending_p = 1; | |
1767 | event_child->status_pending = *wstat; | |
1768 | } | |
1769 | } | |
1770 | else | |
1771 | return event_pid; | |
1772 | } | |
1773 | } | |
1774 | ||
6bf5e0ba PA |
1775 | |
1776 | /* Count the LWP's that have had events. */ | |
1777 | ||
1778 | static int | |
1779 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1780 | { | |
1781 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1782 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1783 | int *count = data; |
1784 | ||
1785 | gdb_assert (count != NULL); | |
1786 | ||
1787 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1788 | should be reported to GDB. */ | |
8336d594 PA |
1789 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1790 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
1791 | && lp->status_pending_p |
1792 | && WIFSTOPPED (lp->status_pending) | |
1793 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1794 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1795 | (*count)++; | |
1796 | ||
1797 | return 0; | |
1798 | } | |
1799 | ||
1800 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1801 | ||
1802 | static int | |
1803 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1804 | { | |
1805 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1806 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 1807 | |
8336d594 PA |
1808 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1809 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
1810 | && lp->status_pending_p) |
1811 | return 1; | |
1812 | else | |
1813 | return 0; | |
1814 | } | |
1815 | ||
1816 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1817 | reported to GDB. */ | |
1818 | ||
1819 | static int | |
1820 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1821 | { | |
1822 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1823 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1824 | int *selector = data; |
1825 | ||
1826 | gdb_assert (selector != NULL); | |
1827 | ||
1828 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
1829 | if (thread->last_resume_kind != resume_stop |
1830 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1831 | && lp->status_pending_p |
1832 | && WIFSTOPPED (lp->status_pending) | |
1833 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1834 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1835 | if ((*selector)-- == 0) | |
1836 | return 1; | |
1837 | ||
1838 | return 0; | |
1839 | } | |
1840 | ||
1841 | static int | |
1842 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
1843 | { | |
1844 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1845 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1846 | struct lwp_info *event_lp = data; |
1847 | ||
1848 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1849 | if (lp == event_lp) | |
1850 | return 0; | |
1851 | ||
1852 | /* If a LWP other than the LWP that we're reporting an event for has | |
1853 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1854 | then just arrange for it to hit it again later. We don't keep | |
1855 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1856 | LWP. We will handle the current event, eventually we will resume | |
1857 | all LWPs, and this one will get its breakpoint trap again. | |
1858 | ||
1859 | If we do not do this, then we run the risk that the user will | |
1860 | delete or disable the breakpoint, but the LWP will have already | |
1861 | tripped on it. */ | |
1862 | ||
8336d594 PA |
1863 | if (thread->last_resume_kind != resume_stop |
1864 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1865 | && lp->status_pending_p |
1866 | && WIFSTOPPED (lp->status_pending) | |
1867 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
1868 | && !lp->stepping |
1869 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
1870 | && cancel_breakpoint (lp)) |
1871 | /* Throw away the SIGTRAP. */ | |
1872 | lp->status_pending_p = 0; | |
1873 | ||
1874 | return 0; | |
1875 | } | |
1876 | ||
7984d532 PA |
1877 | static void |
1878 | linux_cancel_breakpoints (void) | |
1879 | { | |
1880 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
1881 | } | |
1882 | ||
6bf5e0ba PA |
1883 | /* Select one LWP out of those that have events pending. */ |
1884 | ||
1885 | static void | |
1886 | select_event_lwp (struct lwp_info **orig_lp) | |
1887 | { | |
1888 | int num_events = 0; | |
1889 | int random_selector; | |
1890 | struct lwp_info *event_lp; | |
1891 | ||
1892 | /* Give preference to any LWP that is being single-stepped. */ | |
1893 | event_lp | |
1894 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1895 | select_singlestep_lwp_callback, NULL); | |
1896 | if (event_lp != NULL) | |
1897 | { | |
1898 | if (debug_threads) | |
1899 | fprintf (stderr, | |
1900 | "SEL: Select single-step %s\n", | |
1901 | target_pid_to_str (ptid_of (event_lp))); | |
1902 | } | |
1903 | else | |
1904 | { | |
1905 | /* No single-stepping LWP. Select one at random, out of those | |
1906 | which have had SIGTRAP events. */ | |
1907 | ||
1908 | /* First see how many SIGTRAP events we have. */ | |
1909 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
1910 | ||
1911 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1912 | random_selector = (int) | |
1913 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1914 | ||
1915 | if (debug_threads && num_events > 1) | |
1916 | fprintf (stderr, | |
1917 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1918 | num_events, random_selector); | |
1919 | ||
1920 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
1921 | select_event_lwp_callback, | |
1922 | &random_selector); | |
1923 | } | |
1924 | ||
1925 | if (event_lp != NULL) | |
1926 | { | |
1927 | /* Switch the event LWP. */ | |
1928 | *orig_lp = event_lp; | |
1929 | } | |
1930 | } | |
1931 | ||
7984d532 PA |
1932 | /* Decrement the suspend count of an LWP. */ |
1933 | ||
1934 | static int | |
1935 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
1936 | { | |
1937 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1938 | ||
1939 | /* Ignore EXCEPT. */ | |
1940 | if (lwp == except) | |
1941 | return 0; | |
1942 | ||
1943 | lwp->suspended--; | |
1944 | ||
1945 | gdb_assert (lwp->suspended >= 0); | |
1946 | return 0; | |
1947 | } | |
1948 | ||
1949 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
1950 | NULL. */ | |
1951 | ||
1952 | static void | |
1953 | unsuspend_all_lwps (struct lwp_info *except) | |
1954 | { | |
1955 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
1956 | } | |
1957 | ||
fa593d66 PA |
1958 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
1959 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
1960 | void *data); | |
1961 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
1962 | static ptid_t linux_wait_1 (ptid_t ptid, | |
1963 | struct target_waitstatus *ourstatus, | |
1964 | int target_options); | |
1965 | ||
1966 | /* Stabilize threads (move out of jump pads). | |
1967 | ||
1968 | If a thread is midway collecting a fast tracepoint, we need to | |
1969 | finish the collection and move it out of the jump pad before | |
1970 | reporting the signal. | |
1971 | ||
1972 | This avoids recursion while collecting (when a signal arrives | |
1973 | midway, and the signal handler itself collects), which would trash | |
1974 | the trace buffer. In case the user set a breakpoint in a signal | |
1975 | handler, this avoids the backtrace showing the jump pad, etc.. | |
1976 | Most importantly, there are certain things we can't do safely if | |
1977 | threads are stopped in a jump pad (or in its callee's). For | |
1978 | example: | |
1979 | ||
1980 | - starting a new trace run. A thread still collecting the | |
1981 | previous run, could trash the trace buffer when resumed. The trace | |
1982 | buffer control structures would have been reset but the thread had | |
1983 | no way to tell. The thread could even midway memcpy'ing to the | |
1984 | buffer, which would mean that when resumed, it would clobber the | |
1985 | trace buffer that had been set for a new run. | |
1986 | ||
1987 | - we can't rewrite/reuse the jump pads for new tracepoints | |
1988 | safely. Say you do tstart while a thread is stopped midway while | |
1989 | collecting. When the thread is later resumed, it finishes the | |
1990 | collection, and returns to the jump pad, to execute the original | |
1991 | instruction that was under the tracepoint jump at the time the | |
1992 | older run had been started. If the jump pad had been rewritten | |
1993 | since for something else in the new run, the thread would now | |
1994 | execute the wrong / random instructions. */ | |
1995 | ||
1996 | static void | |
1997 | linux_stabilize_threads (void) | |
1998 | { | |
1999 | struct thread_info *save_inferior; | |
2000 | struct lwp_info *lwp_stuck; | |
2001 | ||
2002 | lwp_stuck | |
2003 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2004 | stuck_in_jump_pad_callback, NULL); | |
2005 | if (lwp_stuck != NULL) | |
2006 | { | |
b4d51a55 PA |
2007 | if (debug_threads) |
2008 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
2009 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2010 | return; |
2011 | } | |
2012 | ||
2013 | save_inferior = current_inferior; | |
2014 | ||
2015 | stabilizing_threads = 1; | |
2016 | ||
2017 | /* Kick 'em all. */ | |
2018 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2019 | ||
2020 | /* Loop until all are stopped out of the jump pads. */ | |
2021 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2022 | { | |
2023 | struct target_waitstatus ourstatus; | |
2024 | struct lwp_info *lwp; | |
fa593d66 PA |
2025 | int wstat; |
2026 | ||
2027 | /* Note that we go through the full wait even loop. While | |
2028 | moving threads out of jump pad, we need to be able to step | |
2029 | over internal breakpoints and such. */ | |
32fcada3 | 2030 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2031 | |
2032 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2033 | { | |
2034 | lwp = get_thread_lwp (current_inferior); | |
2035 | ||
2036 | /* Lock it. */ | |
2037 | lwp->suspended++; | |
2038 | ||
2039 | if (ourstatus.value.sig != TARGET_SIGNAL_0 | |
2040 | || current_inferior->last_resume_kind == resume_stop) | |
2041 | { | |
2042 | wstat = W_STOPCODE (target_signal_to_host (ourstatus.value.sig)); | |
2043 | enqueue_one_deferred_signal (lwp, &wstat); | |
2044 | } | |
2045 | } | |
2046 | } | |
2047 | ||
2048 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2049 | ||
2050 | stabilizing_threads = 0; | |
2051 | ||
2052 | current_inferior = save_inferior; | |
2053 | ||
b4d51a55 | 2054 | if (debug_threads) |
fa593d66 | 2055 | { |
b4d51a55 PA |
2056 | lwp_stuck |
2057 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2058 | stuck_in_jump_pad_callback, NULL); | |
2059 | if (lwp_stuck != NULL) | |
fa593d66 PA |
2060 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2061 | lwpid_of (lwp_stuck)); | |
2062 | } | |
2063 | } | |
2064 | ||
0d62e5e8 | 2065 | /* Wait for process, returns status. */ |
da6d8c04 | 2066 | |
95954743 PA |
2067 | static ptid_t |
2068 | linux_wait_1 (ptid_t ptid, | |
2069 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2070 | { |
e5f1222d | 2071 | int w; |
fc7238bb | 2072 | struct lwp_info *event_child; |
bd99dc85 | 2073 | int options; |
bd99dc85 | 2074 | int pid; |
6bf5e0ba PA |
2075 | int step_over_finished; |
2076 | int bp_explains_trap; | |
2077 | int maybe_internal_trap; | |
2078 | int report_to_gdb; | |
219f2f23 | 2079 | int trace_event; |
bd99dc85 PA |
2080 | |
2081 | /* Translate generic target options into linux options. */ | |
2082 | options = __WALL; | |
2083 | if (target_options & TARGET_WNOHANG) | |
2084 | options |= WNOHANG; | |
0d62e5e8 DJ |
2085 | |
2086 | retry: | |
fa593d66 PA |
2087 | bp_explains_trap = 0; |
2088 | trace_event = 0; | |
bd99dc85 PA |
2089 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2090 | ||
0d62e5e8 DJ |
2091 | /* If we were only supposed to resume one thread, only wait for |
2092 | that thread - if it's still alive. If it died, however - which | |
2093 | can happen if we're coming from the thread death case below - | |
2094 | then we need to make sure we restart the other threads. We could | |
2095 | pick a thread at random or restart all; restarting all is less | |
2096 | arbitrary. */ | |
95954743 PA |
2097 | if (!non_stop |
2098 | && !ptid_equal (cont_thread, null_ptid) | |
2099 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2100 | { |
fc7238bb PA |
2101 | struct thread_info *thread; |
2102 | ||
bd99dc85 PA |
2103 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2104 | cont_thread); | |
0d62e5e8 DJ |
2105 | |
2106 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2107 | if (thread == NULL) |
64386c31 DJ |
2108 | { |
2109 | struct thread_resume resume_info; | |
95954743 | 2110 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2111 | resume_info.kind = resume_continue; |
2112 | resume_info.sig = 0; | |
2bd7c093 | 2113 | linux_resume (&resume_info, 1); |
64386c31 | 2114 | } |
bd99dc85 | 2115 | else |
95954743 | 2116 | ptid = cont_thread; |
0d62e5e8 | 2117 | } |
da6d8c04 | 2118 | |
6bf5e0ba PA |
2119 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2120 | pid = linux_wait_for_event (ptid, &w, options); | |
2121 | else | |
2122 | { | |
2123 | if (debug_threads) | |
2124 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2125 | target_pid_to_str (step_over_bkpt)); | |
2126 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2127 | } | |
2128 | ||
bd99dc85 | 2129 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2130 | return null_ptid; |
bd99dc85 | 2131 | |
6bf5e0ba | 2132 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2133 | |
0d62e5e8 DJ |
2134 | /* If we are waiting for a particular child, and it exited, |
2135 | linux_wait_for_event will return its exit status. Similarly if | |
2136 | the last child exited. If this is not the last child, however, | |
2137 | do not report it as exited until there is a 'thread exited' response | |
2138 | available in the remote protocol. Instead, just wait for another event. | |
2139 | This should be safe, because if the thread crashed we will already | |
2140 | have reported the termination signal to GDB; that should stop any | |
2141 | in-progress stepping operations, etc. | |
2142 | ||
2143 | Report the exit status of the last thread to exit. This matches | |
2144 | LinuxThreads' behavior. */ | |
2145 | ||
95954743 | 2146 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2147 | { |
bd99dc85 | 2148 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2149 | { |
bd99dc85 PA |
2150 | if (WIFEXITED (w)) |
2151 | { | |
2152 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2153 | ourstatus->value.integer = WEXITSTATUS (w); | |
2154 | ||
2155 | if (debug_threads) | |
493e2a69 MS |
2156 | fprintf (stderr, |
2157 | "\nChild exited with retcode = %x \n", | |
2158 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2159 | } |
2160 | else | |
2161 | { | |
2162 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2163 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
2164 | ||
2165 | if (debug_threads) | |
493e2a69 MS |
2166 | fprintf (stderr, |
2167 | "\nChild terminated with signal = %x \n", | |
2168 | WTERMSIG (w)); | |
bd99dc85 PA |
2169 | |
2170 | } | |
5b1c542e | 2171 | |
3e4c1235 | 2172 | return ptid_of (event_child); |
0d62e5e8 | 2173 | } |
da6d8c04 | 2174 | } |
0d62e5e8 | 2175 | else |
da6d8c04 | 2176 | { |
0d62e5e8 DJ |
2177 | if (!WIFSTOPPED (w)) |
2178 | goto retry; | |
da6d8c04 DJ |
2179 | } |
2180 | ||
6bf5e0ba PA |
2181 | /* If this event was not handled before, and is not a SIGTRAP, we |
2182 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2183 | a breakpoint is inserted at the current PC. If this target does | |
2184 | not support internal breakpoints at all, we also report the | |
2185 | SIGTRAP without further processing; it's of no concern to us. */ | |
2186 | maybe_internal_trap | |
2187 | = (supports_breakpoints () | |
2188 | && (WSTOPSIG (w) == SIGTRAP | |
2189 | || ((WSTOPSIG (w) == SIGILL | |
2190 | || WSTOPSIG (w) == SIGSEGV) | |
2191 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2192 | ||
2193 | if (maybe_internal_trap) | |
2194 | { | |
2195 | /* Handle anything that requires bookkeeping before deciding to | |
2196 | report the event or continue waiting. */ | |
2197 | ||
2198 | /* First check if we can explain the SIGTRAP with an internal | |
2199 | breakpoint, or if we should possibly report the event to GDB. | |
2200 | Do this before anything that may remove or insert a | |
2201 | breakpoint. */ | |
2202 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2203 | ||
2204 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2205 | finished. If so, tweak the state machine accordingly, | |
2206 | reinsert breakpoints and delete any reinsert (software | |
2207 | single-step) breakpoints. */ | |
2208 | step_over_finished = finish_step_over (event_child); | |
2209 | ||
2210 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2211 | check_breakpoints (event_child->stop_pc); | |
2212 | ||
219f2f23 PA |
2213 | /* Handle tracepoint data collecting. This may overflow the |
2214 | trace buffer, and cause a tracing stop, removing | |
2215 | breakpoints. */ | |
2216 | trace_event = handle_tracepoints (event_child); | |
2217 | ||
6bf5e0ba PA |
2218 | if (bp_explains_trap) |
2219 | { | |
2220 | /* If we stepped or ran into an internal breakpoint, we've | |
2221 | already handled it. So next time we resume (from this | |
2222 | PC), we should step over it. */ | |
2223 | if (debug_threads) | |
2224 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2225 | ||
8b07ae33 PA |
2226 | if (breakpoint_here (event_child->stop_pc)) |
2227 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2228 | } |
2229 | } | |
2230 | else | |
2231 | { | |
2232 | /* We have some other signal, possibly a step-over dance was in | |
2233 | progress, and it should be cancelled too. */ | |
2234 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2235 | } |
2236 | ||
2237 | /* We have all the data we need. Either report the event to GDB, or | |
2238 | resume threads and keep waiting for more. */ | |
2239 | ||
2240 | /* If we're collecting a fast tracepoint, finish the collection and | |
2241 | move out of the jump pad before delivering a signal. See | |
2242 | linux_stabilize_threads. */ | |
2243 | ||
2244 | if (WIFSTOPPED (w) | |
2245 | && WSTOPSIG (w) != SIGTRAP | |
2246 | && supports_fast_tracepoints () | |
2247 | && in_process_agent_loaded ()) | |
2248 | { | |
2249 | if (debug_threads) | |
2250 | fprintf (stderr, | |
2251 | "Got signal %d for LWP %ld. Check if we need " | |
2252 | "to defer or adjust it.\n", | |
2253 | WSTOPSIG (w), lwpid_of (event_child)); | |
2254 | ||
2255 | /* Allow debugging the jump pad itself. */ | |
2256 | if (current_inferior->last_resume_kind != resume_step | |
2257 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2258 | { | |
2259 | enqueue_one_deferred_signal (event_child, &w); | |
2260 | ||
2261 | if (debug_threads) | |
2262 | fprintf (stderr, | |
2263 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2264 | WSTOPSIG (w), lwpid_of (event_child)); | |
2265 | ||
2266 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2267 | goto retry; | |
2268 | } | |
2269 | } | |
219f2f23 | 2270 | |
fa593d66 PA |
2271 | if (event_child->collecting_fast_tracepoint) |
2272 | { | |
2273 | if (debug_threads) | |
2274 | fprintf (stderr, "\ | |
2275 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2276 | Check if we're already there.\n", | |
2277 | lwpid_of (event_child), | |
2278 | event_child->collecting_fast_tracepoint); | |
2279 | ||
2280 | trace_event = 1; | |
2281 | ||
2282 | event_child->collecting_fast_tracepoint | |
2283 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2284 | ||
2285 | if (event_child->collecting_fast_tracepoint != 1) | |
2286 | { | |
2287 | /* No longer need this breakpoint. */ | |
2288 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2289 | { | |
2290 | if (debug_threads) | |
2291 | fprintf (stderr, | |
2292 | "No longer need exit-jump-pad bkpt; removing it." | |
2293 | "stopping all threads momentarily.\n"); | |
2294 | ||
2295 | /* Other running threads could hit this breakpoint. | |
2296 | We don't handle moribund locations like GDB does, | |
2297 | instead we always pause all threads when removing | |
2298 | breakpoints, so that any step-over or | |
2299 | decr_pc_after_break adjustment is always taken | |
2300 | care of while the breakpoint is still | |
2301 | inserted. */ | |
2302 | stop_all_lwps (1, event_child); | |
2303 | cancel_breakpoints (); | |
2304 | ||
2305 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2306 | event_child->exit_jump_pad_bkpt = NULL; | |
2307 | ||
2308 | unstop_all_lwps (1, event_child); | |
2309 | ||
2310 | gdb_assert (event_child->suspended >= 0); | |
2311 | } | |
2312 | } | |
2313 | ||
2314 | if (event_child->collecting_fast_tracepoint == 0) | |
2315 | { | |
2316 | if (debug_threads) | |
2317 | fprintf (stderr, | |
2318 | "fast tracepoint finished " | |
2319 | "collecting successfully.\n"); | |
2320 | ||
2321 | /* We may have a deferred signal to report. */ | |
2322 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2323 | { | |
2324 | if (debug_threads) | |
2325 | fprintf (stderr, "dequeued one signal.\n"); | |
2326 | } | |
3c11dd79 | 2327 | else |
fa593d66 | 2328 | { |
3c11dd79 PA |
2329 | if (debug_threads) |
2330 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2331 | |
2332 | if (stabilizing_threads) | |
2333 | { | |
2334 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
2335 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2336 | return ptid_of (event_child); | |
2337 | } | |
2338 | } | |
2339 | } | |
6bf5e0ba PA |
2340 | } |
2341 | ||
e471f25b PA |
2342 | /* Check whether GDB would be interested in this event. */ |
2343 | ||
2344 | /* If GDB is not interested in this signal, don't stop other | |
2345 | threads, and don't report it to GDB. Just resume the inferior | |
2346 | right away. We do this for threading-related signals as well as | |
2347 | any that GDB specifically requested we ignore. But never ignore | |
2348 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2349 | stepping - they may require special handling to skip the signal | |
2350 | handler. */ | |
2351 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2352 | thread library? */ | |
2353 | if (WIFSTOPPED (w) | |
2354 | && current_inferior->last_resume_kind != resume_step | |
2355 | && ( | |
1a981360 | 2356 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2357 | (current_process ()->private->thread_db != NULL |
2358 | && (WSTOPSIG (w) == __SIGRTMIN | |
2359 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2360 | || | |
2361 | #endif | |
2362 | (pass_signals[target_signal_from_host (WSTOPSIG (w))] | |
2363 | && !(WSTOPSIG (w) == SIGSTOP | |
2364 | && current_inferior->last_resume_kind == resume_stop)))) | |
2365 | { | |
2366 | siginfo_t info, *info_p; | |
2367 | ||
2368 | if (debug_threads) | |
2369 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2370 | WSTOPSIG (w), lwpid_of (event_child)); | |
2371 | ||
2372 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) | |
2373 | info_p = &info; | |
2374 | else | |
2375 | info_p = NULL; | |
2376 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2377 | WSTOPSIG (w), info_p); | |
2378 | goto retry; | |
2379 | } | |
2380 | ||
2381 | /* If GDB wanted this thread to single step, we always want to | |
2382 | report the SIGTRAP, and let GDB handle it. Watchpoints should | |
2383 | always be reported. So should signals we can't explain. A | |
2384 | SIGTRAP we can't explain could be a GDB breakpoint --- we may or | |
2385 | not support Z0 breakpoints. If we do, we're be able to handle | |
2386 | GDB breakpoints on top of internal breakpoints, by handling the | |
2387 | internal breakpoint and still reporting the event to GDB. If we | |
2388 | don't, we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 2389 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 2390 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 2391 | || event_child->stopped_by_watchpoint |
493e2a69 MS |
2392 | || (!step_over_finished |
2393 | && !bp_explains_trap && !trace_event) | |
8b07ae33 | 2394 | || gdb_breakpoint_here (event_child->stop_pc)); |
6bf5e0ba PA |
2395 | |
2396 | /* We found no reason GDB would want us to stop. We either hit one | |
2397 | of our own breakpoints, or finished an internal step GDB | |
2398 | shouldn't know about. */ | |
2399 | if (!report_to_gdb) | |
2400 | { | |
2401 | if (debug_threads) | |
2402 | { | |
2403 | if (bp_explains_trap) | |
2404 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2405 | if (step_over_finished) | |
2406 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2407 | if (trace_event) |
2408 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
2409 | } |
2410 | ||
2411 | /* We're not reporting this breakpoint to GDB, so apply the | |
2412 | decr_pc_after_break adjustment to the inferior's regcache | |
2413 | ourselves. */ | |
2414 | ||
2415 | if (the_low_target.set_pc != NULL) | |
2416 | { | |
2417 | struct regcache *regcache | |
2418 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2419 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2420 | } | |
2421 | ||
7984d532 PA |
2422 | /* We may have finished stepping over a breakpoint. If so, |
2423 | we've stopped and suspended all LWPs momentarily except the | |
2424 | stepping one. This is where we resume them all again. We're | |
2425 | going to keep waiting, so use proceed, which handles stepping | |
2426 | over the next breakpoint. */ | |
6bf5e0ba PA |
2427 | if (debug_threads) |
2428 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2429 | |
2430 | if (step_over_finished) | |
2431 | unsuspend_all_lwps (event_child); | |
2432 | ||
6bf5e0ba PA |
2433 | proceed_all_lwps (); |
2434 | goto retry; | |
2435 | } | |
2436 | ||
2437 | if (debug_threads) | |
2438 | { | |
8336d594 | 2439 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
2440 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
2441 | if (event_child->stopped_by_watchpoint) | |
2442 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2443 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2444 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2445 | if (debug_threads) |
2446 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2447 | } | |
2448 | ||
2449 | /* Alright, we're going to report a stop. */ | |
2450 | ||
fa593d66 | 2451 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2452 | { |
2453 | /* In all-stop, stop all threads. */ | |
7984d532 | 2454 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2455 | |
2456 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2457 | from among those that have had events. Giving equal priority | |
2458 | to all LWPs that have had events helps prevent | |
2459 | starvation. */ | |
2460 | if (ptid_equal (ptid, minus_one_ptid)) | |
2461 | { | |
2462 | event_child->status_pending_p = 1; | |
2463 | event_child->status_pending = w; | |
2464 | ||
2465 | select_event_lwp (&event_child); | |
2466 | ||
2467 | event_child->status_pending_p = 0; | |
2468 | w = event_child->status_pending; | |
2469 | } | |
2470 | ||
2471 | /* Now that we've selected our final event LWP, cancel any | |
2472 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2473 | See the comment in cancel_breakpoints_callback to find out | |
2474 | why. */ | |
2475 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 PA |
2476 | |
2477 | /* Stabilize threads (move out of jump pads). */ | |
2478 | stabilize_threads (); | |
6bf5e0ba PA |
2479 | } |
2480 | else | |
2481 | { | |
2482 | /* If we just finished a step-over, then all threads had been | |
2483 | momentarily paused. In all-stop, that's fine, we want | |
2484 | threads stopped by now anyway. In non-stop, we need to | |
2485 | re-resume threads that GDB wanted to be running. */ | |
2486 | if (step_over_finished) | |
7984d532 | 2487 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2488 | } |
2489 | ||
5b1c542e | 2490 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2491 | |
8336d594 PA |
2492 | if (current_inferior->last_resume_kind == resume_stop |
2493 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2494 | { |
2495 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2496 | and it stopped cleanly, so report as SIG0. The use of | |
2497 | SIGSTOP is an implementation detail. */ | |
2498 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2499 | } | |
8336d594 PA |
2500 | else if (current_inferior->last_resume_kind == resume_stop |
2501 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2502 | { |
2503 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2504 | but, it stopped for other reasons. */ |
bd99dc85 PA |
2505 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
2506 | } | |
2507 | else | |
2508 | { | |
2509 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
2510 | } | |
2511 | ||
d50171e4 PA |
2512 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2513 | ||
bd99dc85 | 2514 | if (debug_threads) |
95954743 | 2515 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2516 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2517 | ourstatus->kind, |
2518 | ourstatus->value.sig); | |
2519 | ||
6bf5e0ba | 2520 | return ptid_of (event_child); |
bd99dc85 PA |
2521 | } |
2522 | ||
2523 | /* Get rid of any pending event in the pipe. */ | |
2524 | static void | |
2525 | async_file_flush (void) | |
2526 | { | |
2527 | int ret; | |
2528 | char buf; | |
2529 | ||
2530 | do | |
2531 | ret = read (linux_event_pipe[0], &buf, 1); | |
2532 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2533 | } | |
2534 | ||
2535 | /* Put something in the pipe, so the event loop wakes up. */ | |
2536 | static void | |
2537 | async_file_mark (void) | |
2538 | { | |
2539 | int ret; | |
2540 | ||
2541 | async_file_flush (); | |
2542 | ||
2543 | do | |
2544 | ret = write (linux_event_pipe[1], "+", 1); | |
2545 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2546 | ||
2547 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2548 | be awakened anyway. */ | |
2549 | } | |
2550 | ||
95954743 PA |
2551 | static ptid_t |
2552 | linux_wait (ptid_t ptid, | |
2553 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2554 | { |
95954743 | 2555 | ptid_t event_ptid; |
bd99dc85 PA |
2556 | |
2557 | if (debug_threads) | |
95954743 | 2558 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2559 | |
2560 | /* Flush the async file first. */ | |
2561 | if (target_is_async_p ()) | |
2562 | async_file_flush (); | |
2563 | ||
95954743 | 2564 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2565 | |
2566 | /* If at least one stop was reported, there may be more. A single | |
2567 | SIGCHLD can signal more than one child stop. */ | |
2568 | if (target_is_async_p () | |
2569 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2570 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2571 | async_file_mark (); |
2572 | ||
2573 | return event_ptid; | |
da6d8c04 DJ |
2574 | } |
2575 | ||
c5f62d5f | 2576 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2577 | |
2578 | static int | |
a1928bad | 2579 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2580 | { |
c5f62d5f DE |
2581 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2582 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2583 | |
c5f62d5f DE |
2584 | #ifdef __NR_tkill |
2585 | { | |
2586 | static int tkill_failed; | |
fd500816 | 2587 | |
c5f62d5f DE |
2588 | if (!tkill_failed) |
2589 | { | |
2590 | int ret; | |
2591 | ||
2592 | errno = 0; | |
2593 | ret = syscall (__NR_tkill, lwpid, signo); | |
2594 | if (errno != ENOSYS) | |
2595 | return ret; | |
2596 | tkill_failed = 1; | |
2597 | } | |
2598 | } | |
fd500816 DJ |
2599 | #endif |
2600 | ||
2601 | return kill (lwpid, signo); | |
2602 | } | |
2603 | ||
964e4306 PA |
2604 | void |
2605 | linux_stop_lwp (struct lwp_info *lwp) | |
2606 | { | |
2607 | send_sigstop (lwp); | |
2608 | } | |
2609 | ||
0d62e5e8 | 2610 | static void |
02fc4de7 | 2611 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2612 | { |
bd99dc85 | 2613 | int pid; |
0d62e5e8 | 2614 | |
bd99dc85 PA |
2615 | pid = lwpid_of (lwp); |
2616 | ||
0d62e5e8 DJ |
2617 | /* If we already have a pending stop signal for this process, don't |
2618 | send another. */ | |
54a0b537 | 2619 | if (lwp->stop_expected) |
0d62e5e8 | 2620 | { |
ae13219e | 2621 | if (debug_threads) |
bd99dc85 | 2622 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2623 | |
0d62e5e8 DJ |
2624 | return; |
2625 | } | |
2626 | ||
2627 | if (debug_threads) | |
bd99dc85 | 2628 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2629 | |
d50171e4 | 2630 | lwp->stop_expected = 1; |
bd99dc85 | 2631 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2632 | } |
2633 | ||
7984d532 PA |
2634 | static int |
2635 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2636 | { |
2637 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2638 | ||
7984d532 PA |
2639 | /* Ignore EXCEPT. */ |
2640 | if (lwp == except) | |
2641 | return 0; | |
2642 | ||
02fc4de7 | 2643 | if (lwp->stopped) |
7984d532 | 2644 | return 0; |
02fc4de7 PA |
2645 | |
2646 | send_sigstop (lwp); | |
7984d532 PA |
2647 | return 0; |
2648 | } | |
2649 | ||
2650 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2651 | yet. */ | |
2652 | static int | |
2653 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2654 | void *except) | |
2655 | { | |
2656 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2657 | ||
2658 | /* Ignore EXCEPT. */ | |
2659 | if (lwp == except) | |
2660 | return 0; | |
2661 | ||
2662 | lwp->suspended++; | |
2663 | ||
2664 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2665 | } |
2666 | ||
95954743 PA |
2667 | static void |
2668 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2669 | { | |
2670 | /* It's dead, really. */ | |
2671 | lwp->dead = 1; | |
2672 | ||
2673 | /* Store the exit status for later. */ | |
2674 | lwp->status_pending_p = 1; | |
2675 | lwp->status_pending = wstat; | |
2676 | ||
95954743 PA |
2677 | /* Prevent trying to stop it. */ |
2678 | lwp->stopped = 1; | |
2679 | ||
2680 | /* No further stops are expected from a dead lwp. */ | |
2681 | lwp->stop_expected = 0; | |
2682 | } | |
2683 | ||
0d62e5e8 DJ |
2684 | static void |
2685 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2686 | { | |
54a0b537 | 2687 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2688 | struct thread_info *saved_inferior; |
a1928bad | 2689 | int wstat; |
95954743 PA |
2690 | ptid_t saved_tid; |
2691 | ptid_t ptid; | |
d50171e4 | 2692 | int pid; |
0d62e5e8 | 2693 | |
54a0b537 | 2694 | if (lwp->stopped) |
d50171e4 PA |
2695 | { |
2696 | if (debug_threads) | |
2697 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2698 | lwpid_of (lwp)); | |
2699 | return; | |
2700 | } | |
0d62e5e8 DJ |
2701 | |
2702 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2703 | if (saved_inferior != NULL) |
2704 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2705 | else | |
95954743 | 2706 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2707 | |
95954743 | 2708 | ptid = lwp->head.id; |
bd99dc85 | 2709 | |
d50171e4 PA |
2710 | if (debug_threads) |
2711 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2712 | ||
2713 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2714 | |
2715 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2716 | and record the pending SIGSTOP. If the process exited, just | |
2717 | return. */ | |
d50171e4 | 2718 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2719 | { |
2720 | if (debug_threads) | |
d50171e4 PA |
2721 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2722 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2723 | |
d50171e4 | 2724 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2725 | { |
2726 | if (debug_threads) | |
d50171e4 PA |
2727 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2728 | lwpid_of (lwp), wstat); | |
2729 | ||
c35fafde PA |
2730 | lwp->status_pending_p = 1; |
2731 | lwp->status_pending = wstat; | |
2732 | } | |
0d62e5e8 | 2733 | } |
d50171e4 | 2734 | else |
95954743 PA |
2735 | { |
2736 | if (debug_threads) | |
d50171e4 | 2737 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2738 | |
d50171e4 PA |
2739 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2740 | if (lwp) | |
2741 | { | |
2742 | /* Leave this status pending for the next time we're able to | |
2743 | report it. In the mean time, we'll report this lwp as | |
2744 | dead to GDB, so GDB doesn't try to read registers and | |
2745 | memory from it. This can only happen if this was the | |
2746 | last thread of the process; otherwise, PID is removed | |
2747 | from the thread tables before linux_wait_for_event | |
2748 | returns. */ | |
2749 | mark_lwp_dead (lwp, wstat); | |
2750 | } | |
95954743 | 2751 | } |
0d62e5e8 | 2752 | |
bd99dc85 | 2753 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2754 | current_inferior = saved_inferior; |
2755 | else | |
2756 | { | |
2757 | if (debug_threads) | |
2758 | fprintf (stderr, "Previously current thread died.\n"); | |
2759 | ||
bd99dc85 PA |
2760 | if (non_stop) |
2761 | { | |
2762 | /* We can't change the current inferior behind GDB's back, | |
2763 | otherwise, a subsequent command may apply to the wrong | |
2764 | process. */ | |
2765 | current_inferior = NULL; | |
2766 | } | |
2767 | else | |
2768 | { | |
2769 | /* Set a valid thread as current. */ | |
2770 | set_desired_inferior (0); | |
2771 | } | |
0d62e5e8 DJ |
2772 | } |
2773 | } | |
2774 | ||
fa593d66 PA |
2775 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
2776 | move it out, because we need to report the stop event to GDB. For | |
2777 | example, if the user puts a breakpoint in the jump pad, it's | |
2778 | because she wants to debug it. */ | |
2779 | ||
2780 | static int | |
2781 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
2782 | { | |
2783 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2784 | struct thread_info *thread = get_lwp_thread (lwp); | |
2785 | ||
2786 | gdb_assert (lwp->suspended == 0); | |
2787 | gdb_assert (lwp->stopped); | |
2788 | ||
2789 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
2790 | return (supports_fast_tracepoints () | |
2791 | && in_process_agent_loaded () | |
2792 | && (gdb_breakpoint_here (lwp->stop_pc) | |
2793 | || lwp->stopped_by_watchpoint | |
2794 | || thread->last_resume_kind == resume_step) | |
2795 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
2796 | } | |
2797 | ||
2798 | static void | |
2799 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
2800 | { | |
2801 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2802 | struct thread_info *thread = get_lwp_thread (lwp); | |
2803 | int *wstat; | |
2804 | ||
2805 | gdb_assert (lwp->suspended == 0); | |
2806 | gdb_assert (lwp->stopped); | |
2807 | ||
2808 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
2809 | ||
2810 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
2811 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
2812 | && !lwp->stopped_by_watchpoint | |
2813 | && thread->last_resume_kind != resume_step | |
2814 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
2815 | { | |
2816 | if (debug_threads) | |
2817 | fprintf (stderr, | |
2818 | "LWP %ld needs stabilizing (in jump pad)\n", | |
2819 | lwpid_of (lwp)); | |
2820 | ||
2821 | if (wstat) | |
2822 | { | |
2823 | lwp->status_pending_p = 0; | |
2824 | enqueue_one_deferred_signal (lwp, wstat); | |
2825 | ||
2826 | if (debug_threads) | |
2827 | fprintf (stderr, | |
2828 | "Signal %d for LWP %ld deferred " | |
2829 | "(in jump pad)\n", | |
2830 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
2831 | } | |
2832 | ||
2833 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
2834 | } | |
2835 | else | |
2836 | lwp->suspended++; | |
2837 | } | |
2838 | ||
2839 | static int | |
2840 | lwp_running (struct inferior_list_entry *entry, void *data) | |
2841 | { | |
2842 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2843 | ||
2844 | if (lwp->dead) | |
2845 | return 0; | |
2846 | if (lwp->stopped) | |
2847 | return 0; | |
2848 | return 1; | |
2849 | } | |
2850 | ||
7984d532 PA |
2851 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
2852 | If SUSPEND, then also increase the suspend count of every LWP, | |
2853 | except EXCEPT. */ | |
2854 | ||
0d62e5e8 | 2855 | static void |
7984d532 | 2856 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 DJ |
2857 | { |
2858 | stopping_threads = 1; | |
7984d532 PA |
2859 | |
2860 | if (suspend) | |
2861 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
2862 | else | |
2863 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 2864 | for_each_inferior (&all_lwps, wait_for_sigstop); |
0d62e5e8 DJ |
2865 | stopping_threads = 0; |
2866 | } | |
2867 | ||
da6d8c04 DJ |
2868 | /* Resume execution of the inferior process. |
2869 | If STEP is nonzero, single-step it. | |
2870 | If SIGNAL is nonzero, give it that signal. */ | |
2871 | ||
ce3a066d | 2872 | static void |
2acc282a | 2873 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 2874 | int step, int signal, siginfo_t *info) |
da6d8c04 | 2875 | { |
0d62e5e8 | 2876 | struct thread_info *saved_inferior; |
fa593d66 | 2877 | int fast_tp_collecting; |
0d62e5e8 | 2878 | |
54a0b537 | 2879 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
2880 | return; |
2881 | ||
fa593d66 PA |
2882 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
2883 | ||
2884 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
2885 | ||
219f2f23 PA |
2886 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
2887 | user used the "jump" command, or "set $pc = foo"). */ | |
2888 | if (lwp->stop_pc != get_pc (lwp)) | |
2889 | { | |
2890 | /* Collecting 'while-stepping' actions doesn't make sense | |
2891 | anymore. */ | |
2892 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
2893 | } | |
2894 | ||
0d62e5e8 DJ |
2895 | /* If we have pending signals or status, and a new signal, enqueue the |
2896 | signal. Also enqueue the signal if we are waiting to reinsert a | |
2897 | breakpoint; it will be picked up again below. */ | |
2898 | if (signal != 0 | |
fa593d66 PA |
2899 | && (lwp->status_pending_p |
2900 | || lwp->pending_signals != NULL | |
2901 | || lwp->bp_reinsert != 0 | |
2902 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
2903 | { |
2904 | struct pending_signals *p_sig; | |
bca929d3 | 2905 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 2906 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 2907 | p_sig->signal = signal; |
32ca6d61 DJ |
2908 | if (info == NULL) |
2909 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2910 | else | |
2911 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 2912 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
2913 | } |
2914 | ||
d50171e4 PA |
2915 | if (lwp->status_pending_p) |
2916 | { | |
2917 | if (debug_threads) | |
2918 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
2919 | " has pending status\n", | |
2920 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
2921 | lwp->stop_expected ? "expected" : "not expected"); | |
2922 | return; | |
2923 | } | |
0d62e5e8 DJ |
2924 | |
2925 | saved_inferior = current_inferior; | |
54a0b537 | 2926 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
2927 | |
2928 | if (debug_threads) | |
1b3f6016 | 2929 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 2930 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 2931 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
2932 | |
2933 | /* This bit needs some thinking about. If we get a signal that | |
2934 | we must report while a single-step reinsert is still pending, | |
2935 | we often end up resuming the thread. It might be better to | |
2936 | (ew) allow a stack of pending events; then we could be sure that | |
2937 | the reinsert happened right away and not lose any signals. | |
2938 | ||
2939 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 2940 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
2941 | complete correctness, so it won't solve that problem. It may be |
2942 | worthwhile just to solve this one, however. */ | |
54a0b537 | 2943 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
2944 | { |
2945 | if (debug_threads) | |
d50171e4 PA |
2946 | fprintf (stderr, " pending reinsert at 0x%s\n", |
2947 | paddress (lwp->bp_reinsert)); | |
2948 | ||
2949 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
2950 | { | |
fa593d66 PA |
2951 | if (fast_tp_collecting == 0) |
2952 | { | |
2953 | if (step == 0) | |
2954 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
2955 | if (lwp->suspended) | |
2956 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
2957 | lwp->suspended); | |
2958 | } | |
d50171e4 PA |
2959 | |
2960 | step = 1; | |
2961 | } | |
0d62e5e8 DJ |
2962 | |
2963 | /* Postpone any pending signal. It was enqueued above. */ | |
2964 | signal = 0; | |
2965 | } | |
2966 | ||
fa593d66 PA |
2967 | if (fast_tp_collecting == 1) |
2968 | { | |
2969 | if (debug_threads) | |
2970 | fprintf (stderr, "\ | |
2971 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
2972 | lwpid_of (lwp)); | |
2973 | ||
2974 | /* Postpone any pending signal. It was enqueued above. */ | |
2975 | signal = 0; | |
2976 | } | |
2977 | else if (fast_tp_collecting == 2) | |
2978 | { | |
2979 | if (debug_threads) | |
2980 | fprintf (stderr, "\ | |
2981 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
2982 | lwpid_of (lwp)); | |
2983 | ||
2984 | if (can_hardware_single_step ()) | |
2985 | step = 1; | |
2986 | else | |
2987 | fatal ("moving out of jump pad single-stepping" | |
2988 | " not implemented on this target"); | |
2989 | ||
2990 | /* Postpone any pending signal. It was enqueued above. */ | |
2991 | signal = 0; | |
2992 | } | |
2993 | ||
219f2f23 PA |
2994 | /* If we have while-stepping actions in this thread set it stepping. |
2995 | If we have a signal to deliver, it may or may not be set to | |
2996 | SIG_IGN, we don't know. Assume so, and allow collecting | |
2997 | while-stepping into a signal handler. A possible smart thing to | |
2998 | do would be to set an internal breakpoint at the signal return | |
2999 | address, continue, and carry on catching this while-stepping | |
3000 | action only when that breakpoint is hit. A future | |
3001 | enhancement. */ | |
3002 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
3003 | && can_hardware_single_step ()) | |
3004 | { | |
3005 | if (debug_threads) | |
3006 | fprintf (stderr, | |
3007 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
3008 | lwpid_of (lwp)); | |
3009 | step = 1; | |
3010 | } | |
3011 | ||
aa691b87 | 3012 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3013 | { |
442ea881 PA |
3014 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3015 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 3016 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3017 | } |
3018 | ||
fa593d66 PA |
3019 | /* If we have pending signals, consume one unless we are trying to |
3020 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3021 | collect. */ | |
3022 | if (lwp->pending_signals != NULL | |
3023 | && lwp->bp_reinsert == 0 | |
3024 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3025 | { |
3026 | struct pending_signals **p_sig; | |
3027 | ||
54a0b537 | 3028 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3029 | while ((*p_sig)->prev != NULL) |
3030 | p_sig = &(*p_sig)->prev; | |
3031 | ||
3032 | signal = (*p_sig)->signal; | |
32ca6d61 | 3033 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 3034 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 3035 | |
0d62e5e8 DJ |
3036 | free (*p_sig); |
3037 | *p_sig = NULL; | |
3038 | } | |
3039 | ||
aa5ca48f DE |
3040 | if (the_low_target.prepare_to_resume != NULL) |
3041 | the_low_target.prepare_to_resume (lwp); | |
3042 | ||
0d62e5e8 | 3043 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 3044 | get_lwp_thread (lwp)); |
da6d8c04 | 3045 | errno = 0; |
54a0b537 | 3046 | lwp->stopped = 0; |
c3adc08c | 3047 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3048 | lwp->stepping = step; |
14ce3065 DE |
3049 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
3050 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3051 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3052 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
3053 | |
3054 | current_inferior = saved_inferior; | |
da6d8c04 | 3055 | if (errno) |
3221518c UW |
3056 | { |
3057 | /* ESRCH from ptrace either means that the thread was already | |
3058 | running (an error) or that it is gone (a race condition). If | |
3059 | it's gone, we will get a notification the next time we wait, | |
3060 | so we can ignore the error. We could differentiate these | |
3061 | two, but it's tricky without waiting; the thread still exists | |
3062 | as a zombie, so sending it signal 0 would succeed. So just | |
3063 | ignore ESRCH. */ | |
3064 | if (errno == ESRCH) | |
3065 | return; | |
3066 | ||
3067 | perror_with_name ("ptrace"); | |
3068 | } | |
da6d8c04 DJ |
3069 | } |
3070 | ||
2bd7c093 PA |
3071 | struct thread_resume_array |
3072 | { | |
3073 | struct thread_resume *resume; | |
3074 | size_t n; | |
3075 | }; | |
64386c31 DJ |
3076 | |
3077 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
3078 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
3079 | resume request. | |
3080 | ||
3081 | This algorithm is O(threads * resume elements), but resume elements | |
3082 | is small (and will remain small at least until GDB supports thread | |
3083 | suspension). */ | |
2bd7c093 PA |
3084 | static int |
3085 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3086 | { |
54a0b537 | 3087 | struct lwp_info *lwp; |
64386c31 | 3088 | struct thread_info *thread; |
5544ad89 | 3089 | int ndx; |
2bd7c093 | 3090 | struct thread_resume_array *r; |
64386c31 DJ |
3091 | |
3092 | thread = (struct thread_info *) entry; | |
54a0b537 | 3093 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3094 | r = arg; |
64386c31 | 3095 | |
2bd7c093 | 3096 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3097 | { |
3098 | ptid_t ptid = r->resume[ndx].thread; | |
3099 | if (ptid_equal (ptid, minus_one_ptid) | |
3100 | || ptid_equal (ptid, entry->id) | |
3101 | || (ptid_is_pid (ptid) | |
3102 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
3103 | || (ptid_get_lwp (ptid) == -1 | |
3104 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
3105 | { | |
d50171e4 | 3106 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3107 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3108 | { |
3109 | if (debug_threads) | |
3110 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3111 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3112 | ? "stopped" | |
3113 | : "stopping", | |
3114 | lwpid_of (lwp)); | |
3115 | ||
3116 | continue; | |
3117 | } | |
3118 | ||
95954743 | 3119 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3120 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 PA |
3121 | |
3122 | /* If we had a deferred signal to report, dequeue one now. | |
3123 | This can happen if LWP gets more than one signal while | |
3124 | trying to get out of a jump pad. */ | |
3125 | if (lwp->stopped | |
3126 | && !lwp->status_pending_p | |
3127 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3128 | { | |
3129 | lwp->status_pending_p = 1; | |
3130 | ||
3131 | if (debug_threads) | |
3132 | fprintf (stderr, | |
3133 | "Dequeueing deferred signal %d for LWP %ld, " | |
3134 | "leaving status pending.\n", | |
3135 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3136 | } | |
3137 | ||
95954743 PA |
3138 | return 0; |
3139 | } | |
3140 | } | |
2bd7c093 PA |
3141 | |
3142 | /* No resume action for this thread. */ | |
3143 | lwp->resume = NULL; | |
64386c31 | 3144 | |
2bd7c093 | 3145 | return 0; |
5544ad89 DJ |
3146 | } |
3147 | ||
5544ad89 | 3148 | |
bd99dc85 PA |
3149 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3150 | static int | |
3151 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3152 | { |
bd99dc85 | 3153 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3154 | |
bd99dc85 PA |
3155 | /* LWPs which will not be resumed are not interesting, because |
3156 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3157 | if (lwp->resume == NULL) |
bd99dc85 | 3158 | return 0; |
64386c31 | 3159 | |
bd99dc85 | 3160 | if (lwp->status_pending_p) |
d50171e4 PA |
3161 | * (int *) flag_p = 1; |
3162 | ||
3163 | return 0; | |
3164 | } | |
3165 | ||
3166 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3167 | internal breakpoint that we need to step over. It assumes that any | |
3168 | required STOP_PC adjustment has already been propagated to the | |
3169 | inferior's regcache. */ | |
3170 | ||
3171 | static int | |
3172 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3173 | { | |
3174 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3175 | struct thread_info *thread; |
d50171e4 PA |
3176 | struct thread_info *saved_inferior; |
3177 | CORE_ADDR pc; | |
3178 | ||
3179 | /* LWPs which will not be resumed are not interesting, because we | |
3180 | might not wait for them next time through linux_wait. */ | |
3181 | ||
3182 | if (!lwp->stopped) | |
3183 | { | |
3184 | if (debug_threads) | |
3185 | fprintf (stderr, | |
3186 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3187 | lwpid_of (lwp)); | |
3188 | return 0; | |
3189 | } | |
3190 | ||
8336d594 PA |
3191 | thread = get_lwp_thread (lwp); |
3192 | ||
3193 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3194 | { |
3195 | if (debug_threads) | |
3196 | fprintf (stderr, | |
3197 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3198 | lwpid_of (lwp)); | |
3199 | return 0; | |
3200 | } | |
3201 | ||
7984d532 PA |
3202 | gdb_assert (lwp->suspended >= 0); |
3203 | ||
3204 | if (lwp->suspended) | |
3205 | { | |
3206 | if (debug_threads) | |
3207 | fprintf (stderr, | |
3208 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3209 | lwpid_of (lwp)); | |
3210 | return 0; | |
3211 | } | |
3212 | ||
d50171e4 PA |
3213 | if (!lwp->need_step_over) |
3214 | { | |
3215 | if (debug_threads) | |
3216 | fprintf (stderr, | |
3217 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3218 | } | |
5544ad89 | 3219 | |
bd99dc85 | 3220 | if (lwp->status_pending_p) |
d50171e4 PA |
3221 | { |
3222 | if (debug_threads) | |
3223 | fprintf (stderr, | |
3224 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3225 | lwpid_of (lwp)); | |
3226 | return 0; | |
3227 | } | |
3228 | ||
3229 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3230 | or we have. */ | |
3231 | pc = get_pc (lwp); | |
3232 | ||
3233 | /* If the PC has changed since we stopped, then don't do anything, | |
3234 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3235 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3236 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3237 | command, or poked thread's registers herself. */ | |
3238 | if (pc != lwp->stop_pc) | |
3239 | { | |
3240 | if (debug_threads) | |
3241 | fprintf (stderr, | |
3242 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3243 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3244 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3245 | ||
3246 | lwp->need_step_over = 0; | |
3247 | return 0; | |
3248 | } | |
3249 | ||
3250 | saved_inferior = current_inferior; | |
8336d594 | 3251 | current_inferior = thread; |
d50171e4 | 3252 | |
8b07ae33 | 3253 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3254 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3255 | { |
8b07ae33 PA |
3256 | /* Don't step over a breakpoint that GDB expects to hit |
3257 | though. */ | |
3258 | if (gdb_breakpoint_here (pc)) | |
3259 | { | |
3260 | if (debug_threads) | |
3261 | fprintf (stderr, | |
3262 | "Need step over [LWP %ld]? yes, but found" | |
3263 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3264 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3265 | |
8b07ae33 PA |
3266 | current_inferior = saved_inferior; |
3267 | return 0; | |
3268 | } | |
3269 | else | |
3270 | { | |
3271 | if (debug_threads) | |
3272 | fprintf (stderr, | |
493e2a69 MS |
3273 | "Need step over [LWP %ld]? yes, " |
3274 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3275 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3276 | |
8b07ae33 PA |
3277 | /* We've found an lwp that needs stepping over --- return 1 so |
3278 | that find_inferior stops looking. */ | |
3279 | current_inferior = saved_inferior; | |
3280 | ||
3281 | /* If the step over is cancelled, this is set again. */ | |
3282 | lwp->need_step_over = 0; | |
3283 | return 1; | |
3284 | } | |
d50171e4 PA |
3285 | } |
3286 | ||
3287 | current_inferior = saved_inferior; | |
3288 | ||
3289 | if (debug_threads) | |
3290 | fprintf (stderr, | |
3291 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3292 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3293 | |
bd99dc85 | 3294 | return 0; |
5544ad89 DJ |
3295 | } |
3296 | ||
d50171e4 PA |
3297 | /* Start a step-over operation on LWP. When LWP stopped at a |
3298 | breakpoint, to make progress, we need to remove the breakpoint out | |
3299 | of the way. If we let other threads run while we do that, they may | |
3300 | pass by the breakpoint location and miss hitting it. To avoid | |
3301 | that, a step-over momentarily stops all threads while LWP is | |
3302 | single-stepped while the breakpoint is temporarily uninserted from | |
3303 | the inferior. When the single-step finishes, we reinsert the | |
3304 | breakpoint, and let all threads that are supposed to be running, | |
3305 | run again. | |
3306 | ||
3307 | On targets that don't support hardware single-step, we don't | |
3308 | currently support full software single-stepping. Instead, we only | |
3309 | support stepping over the thread event breakpoint, by asking the | |
3310 | low target where to place a reinsert breakpoint. Since this | |
3311 | routine assumes the breakpoint being stepped over is a thread event | |
3312 | breakpoint, it usually assumes the return address of the current | |
3313 | function is a good enough place to set the reinsert breakpoint. */ | |
3314 | ||
3315 | static int | |
3316 | start_step_over (struct lwp_info *lwp) | |
3317 | { | |
3318 | struct thread_info *saved_inferior; | |
3319 | CORE_ADDR pc; | |
3320 | int step; | |
3321 | ||
3322 | if (debug_threads) | |
3323 | fprintf (stderr, | |
3324 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3325 | lwpid_of (lwp)); | |
3326 | ||
7984d532 PA |
3327 | stop_all_lwps (1, lwp); |
3328 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3329 | |
3330 | if (debug_threads) | |
3331 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3332 | ||
3333 | /* Note, we should always reach here with an already adjusted PC, | |
3334 | either by GDB (if we're resuming due to GDB's request), or by our | |
3335 | caller, if we just finished handling an internal breakpoint GDB | |
3336 | shouldn't care about. */ | |
3337 | pc = get_pc (lwp); | |
3338 | ||
3339 | saved_inferior = current_inferior; | |
3340 | current_inferior = get_lwp_thread (lwp); | |
3341 | ||
3342 | lwp->bp_reinsert = pc; | |
3343 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3344 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3345 | |
3346 | if (can_hardware_single_step ()) | |
3347 | { | |
3348 | step = 1; | |
3349 | } | |
3350 | else | |
3351 | { | |
3352 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3353 | set_reinsert_breakpoint (raddr); | |
3354 | step = 0; | |
3355 | } | |
3356 | ||
3357 | current_inferior = saved_inferior; | |
3358 | ||
3359 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3360 | ||
3361 | /* Require next event from this LWP. */ | |
3362 | step_over_bkpt = lwp->head.id; | |
3363 | return 1; | |
3364 | } | |
3365 | ||
3366 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3367 | start_step_over, if still there, and delete any reinsert | |
3368 | breakpoints we've set, on non hardware single-step targets. */ | |
3369 | ||
3370 | static int | |
3371 | finish_step_over (struct lwp_info *lwp) | |
3372 | { | |
3373 | if (lwp->bp_reinsert != 0) | |
3374 | { | |
3375 | if (debug_threads) | |
3376 | fprintf (stderr, "Finished step over.\n"); | |
3377 | ||
3378 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3379 | may be no breakpoint to reinsert there by now. */ | |
3380 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3381 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3382 | |
3383 | lwp->bp_reinsert = 0; | |
3384 | ||
3385 | /* Delete any software-single-step reinsert breakpoints. No | |
3386 | longer needed. We don't have to worry about other threads | |
3387 | hitting this trap, and later not being able to explain it, | |
3388 | because we were stepping over a breakpoint, and we hold all | |
3389 | threads but LWP stopped while doing that. */ | |
3390 | if (!can_hardware_single_step ()) | |
3391 | delete_reinsert_breakpoints (); | |
3392 | ||
3393 | step_over_bkpt = null_ptid; | |
3394 | return 1; | |
3395 | } | |
3396 | else | |
3397 | return 0; | |
3398 | } | |
3399 | ||
5544ad89 DJ |
3400 | /* This function is called once per thread. We check the thread's resume |
3401 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3402 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3403 | |
bd99dc85 PA |
3404 | For threads which we aren't explicitly told otherwise, we preserve |
3405 | the stepping flag; this is used for stepping over gdbserver-placed | |
3406 | breakpoints. | |
3407 | ||
3408 | If pending_flags was set in any thread, we queue any needed | |
3409 | signals, since we won't actually resume. We already have a pending | |
3410 | event to report, so we don't need to preserve any step requests; | |
3411 | they should be re-issued if necessary. */ | |
3412 | ||
3413 | static int | |
3414 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3415 | { |
54a0b537 | 3416 | struct lwp_info *lwp; |
5544ad89 | 3417 | struct thread_info *thread; |
bd99dc85 | 3418 | int step; |
d50171e4 PA |
3419 | int leave_all_stopped = * (int *) arg; |
3420 | int leave_pending; | |
5544ad89 DJ |
3421 | |
3422 | thread = (struct thread_info *) entry; | |
54a0b537 | 3423 | lwp = get_thread_lwp (thread); |
5544ad89 | 3424 | |
2bd7c093 | 3425 | if (lwp->resume == NULL) |
bd99dc85 | 3426 | return 0; |
5544ad89 | 3427 | |
bd99dc85 | 3428 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3429 | { |
bd99dc85 | 3430 | if (debug_threads) |
d50171e4 | 3431 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3432 | |
3433 | if (!lwp->stopped) | |
3434 | { | |
3435 | if (debug_threads) | |
d50171e4 | 3436 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3437 | |
d50171e4 PA |
3438 | /* Stop the thread, and wait for the event asynchronously, |
3439 | through the event loop. */ | |
02fc4de7 | 3440 | send_sigstop (lwp); |
bd99dc85 PA |
3441 | } |
3442 | else | |
3443 | { | |
3444 | if (debug_threads) | |
d50171e4 PA |
3445 | fprintf (stderr, "already stopped LWP %ld\n", |
3446 | lwpid_of (lwp)); | |
3447 | ||
3448 | /* The LWP may have been stopped in an internal event that | |
3449 | was not meant to be notified back to GDB (e.g., gdbserver | |
3450 | breakpoint), so we should be reporting a stop event in | |
3451 | this case too. */ | |
3452 | ||
3453 | /* If the thread already has a pending SIGSTOP, this is a | |
3454 | no-op. Otherwise, something later will presumably resume | |
3455 | the thread and this will cause it to cancel any pending | |
3456 | operation, due to last_resume_kind == resume_stop. If | |
3457 | the thread already has a pending status to report, we | |
3458 | will still report it the next time we wait - see | |
3459 | status_pending_p_callback. */ | |
1a981360 PA |
3460 | |
3461 | /* If we already have a pending signal to report, then | |
3462 | there's no need to queue a SIGSTOP, as this means we're | |
3463 | midway through moving the LWP out of the jumppad, and we | |
3464 | will report the pending signal as soon as that is | |
3465 | finished. */ | |
3466 | if (lwp->pending_signals_to_report == NULL) | |
3467 | send_sigstop (lwp); | |
bd99dc85 | 3468 | } |
32ca6d61 | 3469 | |
bd99dc85 PA |
3470 | /* For stop requests, we're done. */ |
3471 | lwp->resume = NULL; | |
fc7238bb | 3472 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3473 | return 0; |
5544ad89 DJ |
3474 | } |
3475 | ||
bd99dc85 PA |
3476 | /* If this thread which is about to be resumed has a pending status, |
3477 | then don't resume any threads - we can just report the pending | |
3478 | status. Make sure to queue any signals that would otherwise be | |
3479 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3480 | thread has a pending status. If there's a thread that needs the |
3481 | step-over-breakpoint dance, then don't resume any other thread | |
3482 | but that particular one. */ | |
3483 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3484 | |
d50171e4 | 3485 | if (!leave_pending) |
bd99dc85 PA |
3486 | { |
3487 | if (debug_threads) | |
3488 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3489 | |
d50171e4 | 3490 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3491 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3492 | } |
3493 | else | |
3494 | { | |
3495 | if (debug_threads) | |
3496 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3497 | |
bd99dc85 PA |
3498 | /* If we have a new signal, enqueue the signal. */ |
3499 | if (lwp->resume->sig != 0) | |
3500 | { | |
3501 | struct pending_signals *p_sig; | |
3502 | p_sig = xmalloc (sizeof (*p_sig)); | |
3503 | p_sig->prev = lwp->pending_signals; | |
3504 | p_sig->signal = lwp->resume->sig; | |
3505 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3506 | ||
3507 | /* If this is the same signal we were previously stopped by, | |
3508 | make sure to queue its siginfo. We can ignore the return | |
3509 | value of ptrace; if it fails, we'll skip | |
3510 | PTRACE_SETSIGINFO. */ | |
3511 | if (WIFSTOPPED (lwp->last_status) | |
3512 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
3513 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
3514 | ||
3515 | lwp->pending_signals = p_sig; | |
3516 | } | |
3517 | } | |
5544ad89 | 3518 | |
fc7238bb | 3519 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3520 | lwp->resume = NULL; |
5544ad89 | 3521 | return 0; |
0d62e5e8 DJ |
3522 | } |
3523 | ||
3524 | static void | |
2bd7c093 | 3525 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3526 | { |
2bd7c093 | 3527 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3528 | struct lwp_info *need_step_over = NULL; |
3529 | int any_pending; | |
3530 | int leave_all_stopped; | |
c6ecbae5 | 3531 | |
2bd7c093 | 3532 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3533 | |
d50171e4 PA |
3534 | /* If there is a thread which would otherwise be resumed, which has |
3535 | a pending status, then don't resume any threads - we can just | |
3536 | report the pending status. Make sure to queue any signals that | |
3537 | would otherwise be sent. In non-stop mode, we'll apply this | |
3538 | logic to each thread individually. We consume all pending events | |
3539 | before considering to start a step-over (in all-stop). */ | |
3540 | any_pending = 0; | |
bd99dc85 | 3541 | if (!non_stop) |
d50171e4 PA |
3542 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3543 | ||
3544 | /* If there is a thread which would otherwise be resumed, which is | |
3545 | stopped at a breakpoint that needs stepping over, then don't | |
3546 | resume any threads - have it step over the breakpoint with all | |
3547 | other threads stopped, then resume all threads again. Make sure | |
3548 | to queue any signals that would otherwise be delivered or | |
3549 | queued. */ | |
3550 | if (!any_pending && supports_breakpoints ()) | |
3551 | need_step_over | |
3552 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3553 | need_step_over_p, NULL); | |
3554 | ||
3555 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3556 | ||
3557 | if (debug_threads) | |
3558 | { | |
3559 | if (need_step_over != NULL) | |
3560 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3561 | else if (any_pending) | |
3562 | fprintf (stderr, | |
3563 | "Not resuming, all-stop and found " | |
3564 | "an LWP with pending status\n"); | |
3565 | else | |
3566 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3567 | } | |
3568 | ||
3569 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3570 | otherwise deliver. */ | |
3571 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3572 | ||
3573 | if (need_step_over) | |
3574 | start_step_over (need_step_over); | |
3575 | } | |
3576 | ||
3577 | /* This function is called once per thread. We check the thread's | |
3578 | last resume request, which will tell us whether to resume, step, or | |
3579 | leave the thread stopped. Any signal the client requested to be | |
3580 | delivered has already been enqueued at this point. | |
3581 | ||
3582 | If any thread that GDB wants running is stopped at an internal | |
3583 | breakpoint that needs stepping over, we start a step-over operation | |
3584 | on that particular thread, and leave all others stopped. */ | |
3585 | ||
7984d532 PA |
3586 | static int |
3587 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3588 | { |
7984d532 | 3589 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3590 | struct thread_info *thread; |
d50171e4 PA |
3591 | int step; |
3592 | ||
7984d532 PA |
3593 | if (lwp == except) |
3594 | return 0; | |
d50171e4 PA |
3595 | |
3596 | if (debug_threads) | |
3597 | fprintf (stderr, | |
3598 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3599 | ||
3600 | if (!lwp->stopped) | |
3601 | { | |
3602 | if (debug_threads) | |
3603 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3604 | return 0; |
d50171e4 PA |
3605 | } |
3606 | ||
8336d594 PA |
3607 | thread = get_lwp_thread (lwp); |
3608 | ||
02fc4de7 PA |
3609 | if (thread->last_resume_kind == resume_stop |
3610 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3611 | { |
3612 | if (debug_threads) | |
02fc4de7 PA |
3613 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3614 | lwpid_of (lwp)); | |
7984d532 | 3615 | return 0; |
d50171e4 PA |
3616 | } |
3617 | ||
3618 | if (lwp->status_pending_p) | |
3619 | { | |
3620 | if (debug_threads) | |
3621 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3622 | lwpid_of (lwp)); | |
7984d532 | 3623 | return 0; |
d50171e4 PA |
3624 | } |
3625 | ||
7984d532 PA |
3626 | gdb_assert (lwp->suspended >= 0); |
3627 | ||
d50171e4 PA |
3628 | if (lwp->suspended) |
3629 | { | |
3630 | if (debug_threads) | |
3631 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3632 | return 0; |
d50171e4 PA |
3633 | } |
3634 | ||
1a981360 PA |
3635 | if (thread->last_resume_kind == resume_stop |
3636 | && lwp->pending_signals_to_report == NULL | |
3637 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3638 | { |
3639 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3640 | last_status.kind check above would catch it, and we wouldn't | |
3641 | reach here. This LWP may have been momentarily paused by a | |
3642 | stop_all_lwps call while handling for example, another LWP's | |
3643 | step-over. In that case, the pending expected SIGSTOP signal | |
3644 | that was queued at vCont;t handling time will have already | |
3645 | been consumed by wait_for_sigstop, and so we need to requeue | |
3646 | another one here. Note that if the LWP already has a SIGSTOP | |
3647 | pending, this is a no-op. */ | |
3648 | ||
3649 | if (debug_threads) | |
3650 | fprintf (stderr, | |
3651 | "Client wants LWP %ld to stop. " | |
3652 | "Making sure it has a SIGSTOP pending\n", | |
3653 | lwpid_of (lwp)); | |
3654 | ||
3655 | send_sigstop (lwp); | |
3656 | } | |
3657 | ||
8336d594 | 3658 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3659 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3660 | return 0; |
3661 | } | |
3662 | ||
3663 | static int | |
3664 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3665 | { | |
3666 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3667 | ||
3668 | if (lwp == except) | |
3669 | return 0; | |
3670 | ||
3671 | lwp->suspended--; | |
3672 | gdb_assert (lwp->suspended >= 0); | |
3673 | ||
3674 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3675 | } |
3676 | ||
3677 | /* When we finish a step-over, set threads running again. If there's | |
3678 | another thread that may need a step-over, now's the time to start | |
3679 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3680 | ||
3681 | static void | |
3682 | proceed_all_lwps (void) | |
3683 | { | |
3684 | struct lwp_info *need_step_over; | |
3685 | ||
3686 | /* If there is a thread which would otherwise be resumed, which is | |
3687 | stopped at a breakpoint that needs stepping over, then don't | |
3688 | resume any threads - have it step over the breakpoint with all | |
3689 | other threads stopped, then resume all threads again. */ | |
3690 | ||
3691 | if (supports_breakpoints ()) | |
3692 | { | |
3693 | need_step_over | |
3694 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3695 | need_step_over_p, NULL); | |
3696 | ||
3697 | if (need_step_over != NULL) | |
3698 | { | |
3699 | if (debug_threads) | |
3700 | fprintf (stderr, "proceed_all_lwps: found " | |
3701 | "thread %ld needing a step-over\n", | |
3702 | lwpid_of (need_step_over)); | |
3703 | ||
3704 | start_step_over (need_step_over); | |
3705 | return; | |
3706 | } | |
3707 | } | |
5544ad89 | 3708 | |
d50171e4 PA |
3709 | if (debug_threads) |
3710 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3711 | ||
7984d532 | 3712 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3713 | } |
3714 | ||
3715 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3716 | pending statuses, are set to run again, except for EXCEPT, if not | |
3717 | NULL. This undoes a stop_all_lwps call. */ | |
3718 | ||
3719 | static void | |
7984d532 | 3720 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3721 | { |
5544ad89 DJ |
3722 | if (debug_threads) |
3723 | { | |
d50171e4 PA |
3724 | if (except) |
3725 | fprintf (stderr, | |
3726 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3727 | else |
d50171e4 PA |
3728 | fprintf (stderr, |
3729 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3730 | } |
3731 | ||
7984d532 PA |
3732 | if (unsuspend) |
3733 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3734 | else | |
3735 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3736 | } |
3737 | ||
3738 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
3739 | |
3740 | int | |
0a30fbc4 | 3741 | register_addr (int regnum) |
da6d8c04 DJ |
3742 | { |
3743 | int addr; | |
3744 | ||
2ec06d2e | 3745 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
3746 | error ("Invalid register number %d.", regnum); |
3747 | ||
2ec06d2e | 3748 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
3749 | |
3750 | return addr; | |
3751 | } | |
3752 | ||
58caa3dc | 3753 | /* Fetch one register. */ |
da6d8c04 | 3754 | static void |
442ea881 | 3755 | fetch_register (struct regcache *regcache, int regno) |
da6d8c04 DJ |
3756 | { |
3757 | CORE_ADDR regaddr; | |
48d93c75 | 3758 | int i, size; |
0d62e5e8 | 3759 | char *buf; |
95954743 | 3760 | int pid; |
da6d8c04 | 3761 | |
2ec06d2e | 3762 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 3763 | return; |
2ec06d2e | 3764 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 3765 | return; |
da6d8c04 | 3766 | |
0a30fbc4 DJ |
3767 | regaddr = register_addr (regno); |
3768 | if (regaddr == -1) | |
3769 | return; | |
95954743 | 3770 | |
1b3f6016 | 3771 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
50275556 | 3772 | & -sizeof (PTRACE_XFER_TYPE)); |
48d93c75 | 3773 | buf = alloca (size); |
50275556 MR |
3774 | |
3775 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
48d93c75 | 3776 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 DJ |
3777 | { |
3778 | errno = 0; | |
0d62e5e8 | 3779 | *(PTRACE_XFER_TYPE *) (buf + i) = |
14ce3065 DE |
3780 | ptrace (PTRACE_PEEKUSER, pid, |
3781 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3782 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3783 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
da6d8c04 DJ |
3784 | regaddr += sizeof (PTRACE_XFER_TYPE); |
3785 | if (errno != 0) | |
f52cd8cd | 3786 | error ("reading register %d: %s", regno, strerror (errno)); |
da6d8c04 | 3787 | } |
ee1a7ae4 UW |
3788 | |
3789 | if (the_low_target.supply_ptrace_register) | |
442ea881 | 3790 | the_low_target.supply_ptrace_register (regcache, regno, buf); |
5a1f5858 | 3791 | else |
442ea881 | 3792 | supply_register (regcache, regno, buf); |
da6d8c04 DJ |
3793 | } |
3794 | ||
7325beb4 MR |
3795 | /* Store one register. */ |
3796 | static void | |
3797 | store_register (struct regcache *regcache, int regno) | |
3798 | { | |
3799 | CORE_ADDR regaddr; | |
3800 | int i, size; | |
3801 | char *buf; | |
3802 | int pid; | |
3803 | ||
3804 | if (regno >= the_low_target.num_regs) | |
3805 | return; | |
50275556 | 3806 | if ((*the_low_target.cannot_store_register) (regno)) |
7325beb4 MR |
3807 | return; |
3808 | ||
3809 | regaddr = register_addr (regno); | |
3810 | if (regaddr == -1) | |
3811 | return; | |
50275556 MR |
3812 | |
3813 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
3814 | & -sizeof (PTRACE_XFER_TYPE)); | |
7325beb4 MR |
3815 | buf = alloca (size); |
3816 | memset (buf, 0, size); | |
3817 | ||
3818 | if (the_low_target.collect_ptrace_register) | |
3819 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
3820 | else | |
3821 | collect_register (regcache, regno, buf); | |
3822 | ||
3823 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
3824 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
3825 | { | |
3826 | errno = 0; | |
3827 | ptrace (PTRACE_POKEUSER, pid, | |
3828 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3829 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3830 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
3831 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
3832 | if (errno != 0) | |
3833 | { | |
3834 | /* At this point, ESRCH should mean the process is | |
3835 | already gone, in which case we simply ignore attempts | |
3836 | to change its registers. See also the related | |
3837 | comment in linux_resume_one_lwp. */ | |
3838 | if (errno == ESRCH) | |
3839 | return; | |
3840 | ||
3841 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
3842 | error ("writing register %d: %s", regno, strerror (errno)); | |
3843 | } | |
3844 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
3845 | } | |
3846 | } | |
3847 | ||
da6d8c04 | 3848 | /* Fetch all registers, or just one, from the child process. */ |
58caa3dc | 3849 | static void |
442ea881 | 3850 | usr_fetch_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 3851 | { |
4463ce24 | 3852 | if (regno == -1) |
2ec06d2e | 3853 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 3854 | fetch_register (regcache, regno); |
da6d8c04 | 3855 | else |
442ea881 | 3856 | fetch_register (regcache, regno); |
da6d8c04 DJ |
3857 | } |
3858 | ||
3859 | /* Store our register values back into the inferior. | |
3860 | If REGNO is -1, do this for all registers. | |
3861 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc | 3862 | static void |
442ea881 | 3863 | usr_store_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 3864 | { |
7325beb4 | 3865 | if (regno == -1) |
2ec06d2e | 3866 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
7325beb4 MR |
3867 | store_register (regcache, regno); |
3868 | else | |
3869 | store_register (regcache, regno); | |
da6d8c04 | 3870 | } |
58caa3dc DJ |
3871 | #endif /* HAVE_LINUX_USRREGS */ |
3872 | ||
3873 | ||
3874 | ||
3875 | #ifdef HAVE_LINUX_REGSETS | |
3876 | ||
3877 | static int | |
442ea881 | 3878 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3879 | { |
3880 | struct regset_info *regset; | |
e9d25b98 | 3881 | int saw_general_regs = 0; |
95954743 | 3882 | int pid; |
1570b33e | 3883 | struct iovec iov; |
58caa3dc DJ |
3884 | |
3885 | regset = target_regsets; | |
3886 | ||
95954743 | 3887 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3888 | while (regset->size >= 0) |
3889 | { | |
1570b33e L |
3890 | void *buf, *data; |
3891 | int nt_type, res; | |
58caa3dc | 3892 | |
52fa2412 | 3893 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3894 | { |
3895 | regset ++; | |
3896 | continue; | |
3897 | } | |
3898 | ||
bca929d3 | 3899 | buf = xmalloc (regset->size); |
1570b33e L |
3900 | |
3901 | nt_type = regset->nt_type; | |
3902 | if (nt_type) | |
3903 | { | |
3904 | iov.iov_base = buf; | |
3905 | iov.iov_len = regset->size; | |
3906 | data = (void *) &iov; | |
3907 | } | |
3908 | else | |
3909 | data = buf; | |
3910 | ||
dfb64f85 | 3911 | #ifndef __sparc__ |
1570b33e | 3912 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3913 | #else |
1570b33e | 3914 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 3915 | #endif |
58caa3dc DJ |
3916 | if (res < 0) |
3917 | { | |
3918 | if (errno == EIO) | |
3919 | { | |
52fa2412 UW |
3920 | /* If we get EIO on a regset, do not try it again for |
3921 | this process. */ | |
3922 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3923 | free (buf); |
52fa2412 | 3924 | continue; |
58caa3dc DJ |
3925 | } |
3926 | else | |
3927 | { | |
0d62e5e8 | 3928 | char s[256]; |
95954743 PA |
3929 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
3930 | pid); | |
0d62e5e8 | 3931 | perror (s); |
58caa3dc DJ |
3932 | } |
3933 | } | |
e9d25b98 DJ |
3934 | else if (regset->type == GENERAL_REGS) |
3935 | saw_general_regs = 1; | |
442ea881 | 3936 | regset->store_function (regcache, buf); |
58caa3dc | 3937 | regset ++; |
fdeb2a12 | 3938 | free (buf); |
58caa3dc | 3939 | } |
e9d25b98 DJ |
3940 | if (saw_general_regs) |
3941 | return 0; | |
3942 | else | |
3943 | return 1; | |
58caa3dc DJ |
3944 | } |
3945 | ||
3946 | static int | |
442ea881 | 3947 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3948 | { |
3949 | struct regset_info *regset; | |
e9d25b98 | 3950 | int saw_general_regs = 0; |
95954743 | 3951 | int pid; |
1570b33e | 3952 | struct iovec iov; |
58caa3dc DJ |
3953 | |
3954 | regset = target_regsets; | |
3955 | ||
95954743 | 3956 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3957 | while (regset->size >= 0) |
3958 | { | |
1570b33e L |
3959 | void *buf, *data; |
3960 | int nt_type, res; | |
58caa3dc | 3961 | |
52fa2412 | 3962 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3963 | { |
3964 | regset ++; | |
3965 | continue; | |
3966 | } | |
3967 | ||
bca929d3 | 3968 | buf = xmalloc (regset->size); |
545587ee DJ |
3969 | |
3970 | /* First fill the buffer with the current register set contents, | |
3971 | in case there are any items in the kernel's regset that are | |
3972 | not in gdbserver's regcache. */ | |
1570b33e L |
3973 | |
3974 | nt_type = regset->nt_type; | |
3975 | if (nt_type) | |
3976 | { | |
3977 | iov.iov_base = buf; | |
3978 | iov.iov_len = regset->size; | |
3979 | data = (void *) &iov; | |
3980 | } | |
3981 | else | |
3982 | data = buf; | |
3983 | ||
dfb64f85 | 3984 | #ifndef __sparc__ |
1570b33e | 3985 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3986 | #else |
1570b33e | 3987 | res = ptrace (regset->get_request, pid, &iov, data); |
dfb64f85 | 3988 | #endif |
545587ee DJ |
3989 | |
3990 | if (res == 0) | |
3991 | { | |
3992 | /* Then overlay our cached registers on that. */ | |
442ea881 | 3993 | regset->fill_function (regcache, buf); |
545587ee DJ |
3994 | |
3995 | /* Only now do we write the register set. */ | |
dfb64f85 | 3996 | #ifndef __sparc__ |
1570b33e | 3997 | res = ptrace (regset->set_request, pid, nt_type, data); |
dfb64f85 | 3998 | #else |
1570b33e | 3999 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4000 | #endif |
545587ee DJ |
4001 | } |
4002 | ||
58caa3dc DJ |
4003 | if (res < 0) |
4004 | { | |
4005 | if (errno == EIO) | |
4006 | { | |
52fa2412 UW |
4007 | /* If we get EIO on a regset, do not try it again for |
4008 | this process. */ | |
4009 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 4010 | free (buf); |
52fa2412 | 4011 | continue; |
58caa3dc | 4012 | } |
3221518c UW |
4013 | else if (errno == ESRCH) |
4014 | { | |
1b3f6016 PA |
4015 | /* At this point, ESRCH should mean the process is |
4016 | already gone, in which case we simply ignore attempts | |
4017 | to change its registers. See also the related | |
4018 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4019 | free (buf); |
3221518c UW |
4020 | return 0; |
4021 | } | |
58caa3dc DJ |
4022 | else |
4023 | { | |
ce3a066d | 4024 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4025 | } |
4026 | } | |
e9d25b98 DJ |
4027 | else if (regset->type == GENERAL_REGS) |
4028 | saw_general_regs = 1; | |
58caa3dc | 4029 | regset ++; |
09ec9b38 | 4030 | free (buf); |
58caa3dc | 4031 | } |
e9d25b98 DJ |
4032 | if (saw_general_regs) |
4033 | return 0; | |
4034 | else | |
4035 | return 1; | |
ce3a066d | 4036 | return 0; |
58caa3dc DJ |
4037 | } |
4038 | ||
4039 | #endif /* HAVE_LINUX_REGSETS */ | |
4040 | ||
4041 | ||
4042 | void | |
442ea881 | 4043 | linux_fetch_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
4044 | { |
4045 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 4046 | if (regsets_fetch_inferior_registers (regcache) == 0) |
52fa2412 | 4047 | return; |
58caa3dc DJ |
4048 | #endif |
4049 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 4050 | usr_fetch_inferior_registers (regcache, regno); |
58caa3dc DJ |
4051 | #endif |
4052 | } | |
4053 | ||
4054 | void | |
442ea881 | 4055 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
4056 | { |
4057 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 4058 | if (regsets_store_inferior_registers (regcache) == 0) |
52fa2412 | 4059 | return; |
58caa3dc DJ |
4060 | #endif |
4061 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 4062 | usr_store_inferior_registers (regcache, regno); |
58caa3dc DJ |
4063 | #endif |
4064 | } | |
4065 | ||
da6d8c04 | 4066 | |
da6d8c04 DJ |
4067 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4068 | to debugger memory starting at MYADDR. */ | |
4069 | ||
c3e735a6 | 4070 | static int |
f450004a | 4071 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
4072 | { |
4073 | register int i; | |
4074 | /* Round starting address down to longword boundary. */ | |
4075 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4076 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
4077 | register int count |
4078 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
4079 | / sizeof (PTRACE_XFER_TYPE); |
4080 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 4081 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 4082 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
4083 | int fd; |
4084 | char filename[64]; | |
95954743 | 4085 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
4086 | |
4087 | /* Try using /proc. Don't bother for one word. */ | |
4088 | if (len >= 3 * sizeof (long)) | |
4089 | { | |
4090 | /* We could keep this file open and cache it - possibly one per | |
4091 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4092 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4093 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4094 | if (fd == -1) | |
4095 | goto no_proc; | |
4096 | ||
4097 | /* If pread64 is available, use it. It's faster if the kernel | |
4098 | supports it (only one syscall), and it's 64-bit safe even on | |
4099 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4100 | application). */ | |
4101 | #ifdef HAVE_PREAD64 | |
4102 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
4103 | #else | |
1de1badb | 4104 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
4105 | #endif |
4106 | { | |
4107 | close (fd); | |
4108 | goto no_proc; | |
4109 | } | |
4110 | ||
4111 | close (fd); | |
4112 | return 0; | |
4113 | } | |
da6d8c04 | 4114 | |
fd462a61 | 4115 | no_proc: |
da6d8c04 DJ |
4116 | /* Read all the longwords */ |
4117 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4118 | { | |
c3e735a6 | 4119 | errno = 0; |
14ce3065 DE |
4120 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4121 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4122 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
4123 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
4124 | if (errno) |
4125 | return errno; | |
da6d8c04 DJ |
4126 | } |
4127 | ||
4128 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
4129 | memcpy (myaddr, |
4130 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4131 | len); | |
c3e735a6 DJ |
4132 | |
4133 | return 0; | |
da6d8c04 DJ |
4134 | } |
4135 | ||
93ae6fdc PA |
4136 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4137 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
4138 | returns the value of errno. */ |
4139 | ||
ce3a066d | 4140 | static int |
f450004a | 4141 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4142 | { |
4143 | register int i; | |
4144 | /* Round starting address down to longword boundary. */ | |
4145 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4146 | /* Round ending address up; get number of longwords that makes. */ | |
4147 | register int count | |
493e2a69 MS |
4148 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4149 | / sizeof (PTRACE_XFER_TYPE); | |
4150 | ||
da6d8c04 | 4151 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4152 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4153 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4154 | ||
95954743 | 4155 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4156 | |
0d62e5e8 DJ |
4157 | if (debug_threads) |
4158 | { | |
58d6951d DJ |
4159 | /* Dump up to four bytes. */ |
4160 | unsigned int val = * (unsigned int *) myaddr; | |
4161 | if (len == 1) | |
4162 | val = val & 0xff; | |
4163 | else if (len == 2) | |
4164 | val = val & 0xffff; | |
4165 | else if (len == 3) | |
4166 | val = val & 0xffffff; | |
4167 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4168 | val, (long)memaddr); | |
0d62e5e8 DJ |
4169 | } |
4170 | ||
da6d8c04 DJ |
4171 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4172 | ||
93ae6fdc | 4173 | errno = 0; |
14ce3065 DE |
4174 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4175 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4176 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
4177 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
4178 | if (errno) |
4179 | return errno; | |
da6d8c04 DJ |
4180 | |
4181 | if (count > 1) | |
4182 | { | |
93ae6fdc | 4183 | errno = 0; |
da6d8c04 | 4184 | buffer[count - 1] |
95954743 | 4185 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4186 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4187 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4188 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4189 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 4190 | 0); |
93ae6fdc PA |
4191 | if (errno) |
4192 | return errno; | |
da6d8c04 DJ |
4193 | } |
4194 | ||
93ae6fdc | 4195 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4196 | |
493e2a69 MS |
4197 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4198 | myaddr, len); | |
da6d8c04 DJ |
4199 | |
4200 | /* Write the entire buffer. */ | |
4201 | ||
4202 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4203 | { | |
4204 | errno = 0; | |
14ce3065 DE |
4205 | ptrace (PTRACE_POKETEXT, pid, |
4206 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4207 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4208 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4209 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4210 | if (errno) |
4211 | return errno; | |
4212 | } | |
4213 | ||
4214 | return 0; | |
4215 | } | |
2f2893d9 | 4216 | |
6076632b | 4217 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4218 | static int linux_supports_tracefork_flag; |
4219 | ||
1e7fc18c PA |
4220 | static void |
4221 | linux_enable_event_reporting (int pid) | |
4222 | { | |
4223 | if (!linux_supports_tracefork_flag) | |
4224 | return; | |
4225 | ||
4226 | ptrace (PTRACE_SETOPTIONS, pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
4227 | } | |
4228 | ||
51c2684e | 4229 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4230 | |
51c2684e DJ |
4231 | static int |
4232 | linux_tracefork_grandchild (void *arg) | |
4233 | { | |
4234 | _exit (0); | |
4235 | } | |
4236 | ||
7407e2de AS |
4237 | #define STACK_SIZE 4096 |
4238 | ||
51c2684e DJ |
4239 | static int |
4240 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
4241 | { |
4242 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
4243 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
4244 | |
4245 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4246 | ||
4247 | if (fork () == 0) | |
4248 | linux_tracefork_grandchild (NULL); | |
4249 | ||
4250 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4251 | ||
7407e2de AS |
4252 | #ifdef __ia64__ |
4253 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4254 | CLONE_VM | SIGCHLD, NULL); | |
4255 | #else | |
a1f2ce7d | 4256 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4257 | CLONE_VM | SIGCHLD, NULL); |
4258 | #endif | |
e4b7f41c JK |
4259 | |
4260 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4261 | ||
24a09b5f DJ |
4262 | _exit (0); |
4263 | } | |
4264 | ||
24a09b5f DJ |
4265 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4266 | sure that we can enable the option, and that it had the desired | |
4267 | effect. */ | |
4268 | ||
4269 | static void | |
4270 | linux_test_for_tracefork (void) | |
4271 | { | |
4272 | int child_pid, ret, status; | |
4273 | long second_pid; | |
e4b7f41c | 4274 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4275 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4276 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4277 | |
4278 | linux_supports_tracefork_flag = 0; | |
4279 | ||
e4b7f41c JK |
4280 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4281 | ||
4282 | child_pid = fork (); | |
4283 | if (child_pid == 0) | |
4284 | linux_tracefork_child (NULL); | |
4285 | ||
4286 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4287 | ||
51c2684e | 4288 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4289 | #ifdef __ia64__ |
4290 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4291 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4292 | #else /* !__ia64__ */ |
7407e2de AS |
4293 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4294 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4295 | #endif /* !__ia64__ */ |
4296 | ||
4297 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4298 | ||
24a09b5f | 4299 | if (child_pid == -1) |
51c2684e | 4300 | perror_with_name ("clone"); |
24a09b5f DJ |
4301 | |
4302 | ret = my_waitpid (child_pid, &status, 0); | |
4303 | if (ret == -1) | |
4304 | perror_with_name ("waitpid"); | |
4305 | else if (ret != child_pid) | |
4306 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4307 | if (! WIFSTOPPED (status)) | |
4308 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4309 | ||
14ce3065 DE |
4310 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
4311 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
4312 | if (ret != 0) |
4313 | { | |
4314 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4315 | if (ret != 0) | |
4316 | { | |
4317 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4318 | return; | |
4319 | } | |
4320 | ||
4321 | ret = my_waitpid (child_pid, &status, 0); | |
4322 | if (ret != child_pid) | |
4323 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4324 | else if (!WIFSIGNALED (status)) | |
4325 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4326 | "killed child", status); | |
4327 | ||
4328 | return; | |
4329 | } | |
4330 | ||
4331 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
4332 | if (ret != 0) | |
4333 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4334 | ||
4335 | ret = my_waitpid (child_pid, &status, 0); | |
4336 | ||
4337 | if (ret == child_pid && WIFSTOPPED (status) | |
4338 | && status >> 16 == PTRACE_EVENT_FORK) | |
4339 | { | |
4340 | second_pid = 0; | |
4341 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
4342 | if (ret == 0 && second_pid != 0) | |
4343 | { | |
4344 | int second_status; | |
4345 | ||
4346 | linux_supports_tracefork_flag = 1; | |
4347 | my_waitpid (second_pid, &second_status, 0); | |
4348 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
4349 | if (ret != 0) | |
4350 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4351 | my_waitpid (second_pid, &status, 0); | |
4352 | } | |
4353 | } | |
4354 | else | |
4355 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4356 | "(%d, status 0x%x)", ret, status); | |
4357 | ||
4358 | do | |
4359 | { | |
4360 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4361 | if (ret != 0) | |
4362 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4363 | my_waitpid (child_pid, &status, 0); | |
4364 | } | |
4365 | while (WIFSTOPPED (status)); | |
51c2684e | 4366 | |
e4b7f41c | 4367 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4368 | free (stack); |
e4b7f41c | 4369 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4370 | } |
4371 | ||
4372 | ||
2f2893d9 DJ |
4373 | static void |
4374 | linux_look_up_symbols (void) | |
4375 | { | |
0d62e5e8 | 4376 | #ifdef USE_THREAD_DB |
95954743 PA |
4377 | struct process_info *proc = current_process (); |
4378 | ||
cdbfd419 | 4379 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4380 | return; |
4381 | ||
6076632b DE |
4382 | /* If the kernel supports tracing forks then it also supports tracing |
4383 | clones, and then we don't need to use the magic thread event breakpoint | |
4384 | to learn about threads. */ | |
cdbfd419 | 4385 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4386 | #endif |
4387 | } | |
4388 | ||
e5379b03 | 4389 | static void |
ef57601b | 4390 | linux_request_interrupt (void) |
e5379b03 | 4391 | { |
a1928bad | 4392 | extern unsigned long signal_pid; |
e5379b03 | 4393 | |
95954743 PA |
4394 | if (!ptid_equal (cont_thread, null_ptid) |
4395 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4396 | { |
54a0b537 | 4397 | struct lwp_info *lwp; |
bd99dc85 | 4398 | int lwpid; |
e5379b03 | 4399 | |
54a0b537 | 4400 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4401 | lwpid = lwpid_of (lwp); |
4402 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4403 | } |
4404 | else | |
ef57601b | 4405 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4406 | } |
4407 | ||
aa691b87 RM |
4408 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4409 | to debugger memory starting at MYADDR. */ | |
4410 | ||
4411 | static int | |
f450004a | 4412 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4413 | { |
4414 | char filename[PATH_MAX]; | |
4415 | int fd, n; | |
95954743 | 4416 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4417 | |
6cebaf6e | 4418 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4419 | |
4420 | fd = open (filename, O_RDONLY); | |
4421 | if (fd < 0) | |
4422 | return -1; | |
4423 | ||
4424 | if (offset != (CORE_ADDR) 0 | |
4425 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4426 | n = -1; | |
4427 | else | |
4428 | n = read (fd, myaddr, len); | |
4429 | ||
4430 | close (fd); | |
4431 | ||
4432 | return n; | |
4433 | } | |
4434 | ||
d993e290 PA |
4435 | /* These breakpoint and watchpoint related wrapper functions simply |
4436 | pass on the function call if the target has registered a | |
4437 | corresponding function. */ | |
e013ee27 OF |
4438 | |
4439 | static int | |
d993e290 | 4440 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4441 | { |
d993e290 PA |
4442 | if (the_low_target.insert_point != NULL) |
4443 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4444 | else |
4445 | /* Unsupported (see target.h). */ | |
4446 | return 1; | |
4447 | } | |
4448 | ||
4449 | static int | |
d993e290 | 4450 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4451 | { |
d993e290 PA |
4452 | if (the_low_target.remove_point != NULL) |
4453 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4454 | else |
4455 | /* Unsupported (see target.h). */ | |
4456 | return 1; | |
4457 | } | |
4458 | ||
4459 | static int | |
4460 | linux_stopped_by_watchpoint (void) | |
4461 | { | |
c3adc08c PA |
4462 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4463 | ||
4464 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4465 | } |
4466 | ||
4467 | static CORE_ADDR | |
4468 | linux_stopped_data_address (void) | |
4469 | { | |
c3adc08c PA |
4470 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4471 | ||
4472 | return lwp->stopped_data_address; | |
e013ee27 OF |
4473 | } |
4474 | ||
42c81e2a | 4475 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
4476 | #if defined(__mcoldfire__) |
4477 | /* These should really be defined in the kernel's ptrace.h header. */ | |
4478 | #define PT_TEXT_ADDR 49*4 | |
4479 | #define PT_DATA_ADDR 50*4 | |
4480 | #define PT_TEXT_END_ADDR 51*4 | |
eb826dc6 MF |
4481 | #elif defined(BFIN) |
4482 | #define PT_TEXT_ADDR 220 | |
4483 | #define PT_TEXT_END_ADDR 224 | |
4484 | #define PT_DATA_ADDR 228 | |
58dbd541 YQ |
4485 | #elif defined(__TMS320C6X__) |
4486 | #define PT_TEXT_ADDR (0x10000*4) | |
4487 | #define PT_DATA_ADDR (0x10004*4) | |
4488 | #define PT_TEXT_END_ADDR (0x10008*4) | |
52fb6437 NS |
4489 | #endif |
4490 | ||
4491 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4492 | to tell gdb about. */ | |
4493 | ||
4494 | static int | |
4495 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4496 | { | |
4497 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
4498 | unsigned long text, text_end, data; | |
bd99dc85 | 4499 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4500 | |
4501 | errno = 0; | |
4502 | ||
4503 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
4504 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
4505 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
4506 | ||
4507 | if (errno == 0) | |
4508 | { | |
4509 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4510 | used by gdb) are relative to the beginning of the program, |
4511 | with the data segment immediately following the text segment. | |
4512 | However, the actual runtime layout in memory may put the data | |
4513 | somewhere else, so when we send gdb a data base-address, we | |
4514 | use the real data base address and subtract the compile-time | |
4515 | data base-address from it (which is just the length of the | |
4516 | text segment). BSS immediately follows data in both | |
4517 | cases. */ | |
52fb6437 NS |
4518 | *text_p = text; |
4519 | *data_p = data - (text_end - text); | |
1b3f6016 | 4520 | |
52fb6437 NS |
4521 | return 1; |
4522 | } | |
4523 | #endif | |
4524 | return 0; | |
4525 | } | |
4526 | #endif | |
4527 | ||
07e059b5 VP |
4528 | static int |
4529 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4530 | unsigned char *readbuf, unsigned const char *writebuf, |
4531 | CORE_ADDR offset, int len) | |
07e059b5 | 4532 | { |
d26e3629 | 4533 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4534 | } |
4535 | ||
d0722149 DE |
4536 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4537 | layout of the inferiors' architecture. */ | |
4538 | ||
4539 | static void | |
4540 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
4541 | { | |
4542 | int done = 0; | |
4543 | ||
4544 | if (the_low_target.siginfo_fixup != NULL) | |
4545 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4546 | ||
4547 | /* If there was no callback, or the callback didn't do anything, | |
4548 | then just do a straight memcpy. */ | |
4549 | if (!done) | |
4550 | { | |
4551 | if (direction == 1) | |
4552 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4553 | else | |
4554 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4555 | } | |
4556 | } | |
4557 | ||
4aa995e1 PA |
4558 | static int |
4559 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4560 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4561 | { | |
d0722149 | 4562 | int pid; |
4aa995e1 | 4563 | struct siginfo siginfo; |
d0722149 | 4564 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4565 | |
4566 | if (current_inferior == NULL) | |
4567 | return -1; | |
4568 | ||
bd99dc85 | 4569 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4570 | |
4571 | if (debug_threads) | |
d0722149 | 4572 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4573 | readbuf != NULL ? "Reading" : "Writing", |
4574 | pid); | |
4575 | ||
0adea5f7 | 4576 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4577 | return -1; |
4578 | ||
4579 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
4580 | return -1; | |
4581 | ||
d0722149 DE |
4582 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4583 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4584 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4585 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4586 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4587 | ||
4aa995e1 PA |
4588 | if (offset + len > sizeof (siginfo)) |
4589 | len = sizeof (siginfo) - offset; | |
4590 | ||
4591 | if (readbuf != NULL) | |
d0722149 | 4592 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4593 | else |
4594 | { | |
d0722149 DE |
4595 | memcpy (inf_siginfo + offset, writebuf, len); |
4596 | ||
4597 | /* Convert back to ptrace layout before flushing it out. */ | |
4598 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4599 | ||
4aa995e1 PA |
4600 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
4601 | return -1; | |
4602 | } | |
4603 | ||
4604 | return len; | |
4605 | } | |
4606 | ||
bd99dc85 PA |
4607 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4608 | so we notice when children change state; as the handler for the | |
4609 | sigsuspend in my_waitpid. */ | |
4610 | ||
4611 | static void | |
4612 | sigchld_handler (int signo) | |
4613 | { | |
4614 | int old_errno = errno; | |
4615 | ||
4616 | if (debug_threads) | |
e581f2b4 PA |
4617 | { |
4618 | do | |
4619 | { | |
4620 | /* fprintf is not async-signal-safe, so call write | |
4621 | directly. */ | |
4622 | if (write (2, "sigchld_handler\n", | |
4623 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4624 | break; /* just ignore */ | |
4625 | } while (0); | |
4626 | } | |
bd99dc85 PA |
4627 | |
4628 | if (target_is_async_p ()) | |
4629 | async_file_mark (); /* trigger a linux_wait */ | |
4630 | ||
4631 | errno = old_errno; | |
4632 | } | |
4633 | ||
4634 | static int | |
4635 | linux_supports_non_stop (void) | |
4636 | { | |
4637 | return 1; | |
4638 | } | |
4639 | ||
4640 | static int | |
4641 | linux_async (int enable) | |
4642 | { | |
4643 | int previous = (linux_event_pipe[0] != -1); | |
4644 | ||
8336d594 PA |
4645 | if (debug_threads) |
4646 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4647 | enable, previous); | |
4648 | ||
bd99dc85 PA |
4649 | if (previous != enable) |
4650 | { | |
4651 | sigset_t mask; | |
4652 | sigemptyset (&mask); | |
4653 | sigaddset (&mask, SIGCHLD); | |
4654 | ||
4655 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4656 | ||
4657 | if (enable) | |
4658 | { | |
4659 | if (pipe (linux_event_pipe) == -1) | |
4660 | fatal ("creating event pipe failed."); | |
4661 | ||
4662 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4663 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4664 | ||
4665 | /* Register the event loop handler. */ | |
4666 | add_file_handler (linux_event_pipe[0], | |
4667 | handle_target_event, NULL); | |
4668 | ||
4669 | /* Always trigger a linux_wait. */ | |
4670 | async_file_mark (); | |
4671 | } | |
4672 | else | |
4673 | { | |
4674 | delete_file_handler (linux_event_pipe[0]); | |
4675 | ||
4676 | close (linux_event_pipe[0]); | |
4677 | close (linux_event_pipe[1]); | |
4678 | linux_event_pipe[0] = -1; | |
4679 | linux_event_pipe[1] = -1; | |
4680 | } | |
4681 | ||
4682 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4683 | } | |
4684 | ||
4685 | return previous; | |
4686 | } | |
4687 | ||
4688 | static int | |
4689 | linux_start_non_stop (int nonstop) | |
4690 | { | |
4691 | /* Register or unregister from event-loop accordingly. */ | |
4692 | linux_async (nonstop); | |
4693 | return 0; | |
4694 | } | |
4695 | ||
cf8fd78b PA |
4696 | static int |
4697 | linux_supports_multi_process (void) | |
4698 | { | |
4699 | return 1; | |
4700 | } | |
4701 | ||
03583c20 UW |
4702 | static int |
4703 | linux_supports_disable_randomization (void) | |
4704 | { | |
4705 | #ifdef HAVE_PERSONALITY | |
4706 | return 1; | |
4707 | #else | |
4708 | return 0; | |
4709 | #endif | |
4710 | } | |
efcbbd14 UW |
4711 | |
4712 | /* Enumerate spufs IDs for process PID. */ | |
4713 | static int | |
4714 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
4715 | { | |
4716 | int pos = 0; | |
4717 | int written = 0; | |
4718 | char path[128]; | |
4719 | DIR *dir; | |
4720 | struct dirent *entry; | |
4721 | ||
4722 | sprintf (path, "/proc/%ld/fd", pid); | |
4723 | dir = opendir (path); | |
4724 | if (!dir) | |
4725 | return -1; | |
4726 | ||
4727 | rewinddir (dir); | |
4728 | while ((entry = readdir (dir)) != NULL) | |
4729 | { | |
4730 | struct stat st; | |
4731 | struct statfs stfs; | |
4732 | int fd; | |
4733 | ||
4734 | fd = atoi (entry->d_name); | |
4735 | if (!fd) | |
4736 | continue; | |
4737 | ||
4738 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4739 | if (stat (path, &st) != 0) | |
4740 | continue; | |
4741 | if (!S_ISDIR (st.st_mode)) | |
4742 | continue; | |
4743 | ||
4744 | if (statfs (path, &stfs) != 0) | |
4745 | continue; | |
4746 | if (stfs.f_type != SPUFS_MAGIC) | |
4747 | continue; | |
4748 | ||
4749 | if (pos >= offset && pos + 4 <= offset + len) | |
4750 | { | |
4751 | *(unsigned int *)(buf + pos - offset) = fd; | |
4752 | written += 4; | |
4753 | } | |
4754 | pos += 4; | |
4755 | } | |
4756 | ||
4757 | closedir (dir); | |
4758 | return written; | |
4759 | } | |
4760 | ||
4761 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4762 | object type, using the /proc file system. */ | |
4763 | static int | |
4764 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4765 | unsigned const char *writebuf, | |
4766 | CORE_ADDR offset, int len) | |
4767 | { | |
4768 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4769 | char buf[128]; | |
4770 | int fd = 0; | |
4771 | int ret = 0; | |
4772 | ||
4773 | if (!writebuf && !readbuf) | |
4774 | return -1; | |
4775 | ||
4776 | if (!*annex) | |
4777 | { | |
4778 | if (!readbuf) | |
4779 | return -1; | |
4780 | else | |
4781 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4782 | } | |
4783 | ||
4784 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
4785 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4786 | if (fd <= 0) | |
4787 | return -1; | |
4788 | ||
4789 | if (offset != 0 | |
4790 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4791 | { | |
4792 | close (fd); | |
4793 | return 0; | |
4794 | } | |
4795 | ||
4796 | if (writebuf) | |
4797 | ret = write (fd, writebuf, (size_t) len); | |
4798 | else | |
4799 | ret = read (fd, readbuf, (size_t) len); | |
4800 | ||
4801 | close (fd); | |
4802 | return ret; | |
4803 | } | |
4804 | ||
723b724b | 4805 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
4806 | struct target_loadseg |
4807 | { | |
4808 | /* Core address to which the segment is mapped. */ | |
4809 | Elf32_Addr addr; | |
4810 | /* VMA recorded in the program header. */ | |
4811 | Elf32_Addr p_vaddr; | |
4812 | /* Size of this segment in memory. */ | |
4813 | Elf32_Word p_memsz; | |
4814 | }; | |
4815 | ||
723b724b | 4816 | # if defined PT_GETDSBT |
78d85199 YQ |
4817 | struct target_loadmap |
4818 | { | |
4819 | /* Protocol version number, must be zero. */ | |
4820 | Elf32_Word version; | |
4821 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
4822 | unsigned *dsbt_table; | |
4823 | unsigned dsbt_size, dsbt_index; | |
4824 | /* Number of segments in this map. */ | |
4825 | Elf32_Word nsegs; | |
4826 | /* The actual memory map. */ | |
4827 | struct target_loadseg segs[/*nsegs*/]; | |
4828 | }; | |
723b724b MF |
4829 | # define LINUX_LOADMAP PT_GETDSBT |
4830 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
4831 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
4832 | # else | |
4833 | struct target_loadmap | |
4834 | { | |
4835 | /* Protocol version number, must be zero. */ | |
4836 | Elf32_Half version; | |
4837 | /* Number of segments in this map. */ | |
4838 | Elf32_Half nsegs; | |
4839 | /* The actual memory map. */ | |
4840 | struct target_loadseg segs[/*nsegs*/]; | |
4841 | }; | |
4842 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
4843 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
4844 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
4845 | # endif | |
78d85199 | 4846 | |
78d85199 YQ |
4847 | static int |
4848 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
4849 | unsigned char *myaddr, unsigned int len) | |
4850 | { | |
4851 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4852 | int addr = -1; | |
4853 | struct target_loadmap *data = NULL; | |
4854 | unsigned int actual_length, copy_length; | |
4855 | ||
4856 | if (strcmp (annex, "exec") == 0) | |
723b724b | 4857 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 4858 | else if (strcmp (annex, "interp") == 0) |
723b724b | 4859 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
4860 | else |
4861 | return -1; | |
4862 | ||
723b724b | 4863 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
4864 | return -1; |
4865 | ||
4866 | if (data == NULL) | |
4867 | return -1; | |
4868 | ||
4869 | actual_length = sizeof (struct target_loadmap) | |
4870 | + sizeof (struct target_loadseg) * data->nsegs; | |
4871 | ||
4872 | if (offset < 0 || offset > actual_length) | |
4873 | return -1; | |
4874 | ||
4875 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
4876 | memcpy (myaddr, (char *) data + offset, copy_length); | |
4877 | return copy_length; | |
4878 | } | |
723b724b MF |
4879 | #else |
4880 | # define linux_read_loadmap NULL | |
4881 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 4882 | |
1570b33e L |
4883 | static void |
4884 | linux_process_qsupported (const char *query) | |
4885 | { | |
4886 | if (the_low_target.process_qsupported != NULL) | |
4887 | the_low_target.process_qsupported (query); | |
4888 | } | |
4889 | ||
219f2f23 PA |
4890 | static int |
4891 | linux_supports_tracepoints (void) | |
4892 | { | |
4893 | if (*the_low_target.supports_tracepoints == NULL) | |
4894 | return 0; | |
4895 | ||
4896 | return (*the_low_target.supports_tracepoints) (); | |
4897 | } | |
4898 | ||
4899 | static CORE_ADDR | |
4900 | linux_read_pc (struct regcache *regcache) | |
4901 | { | |
4902 | if (the_low_target.get_pc == NULL) | |
4903 | return 0; | |
4904 | ||
4905 | return (*the_low_target.get_pc) (regcache); | |
4906 | } | |
4907 | ||
4908 | static void | |
4909 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
4910 | { | |
4911 | gdb_assert (the_low_target.set_pc != NULL); | |
4912 | ||
4913 | (*the_low_target.set_pc) (regcache, pc); | |
4914 | } | |
4915 | ||
8336d594 PA |
4916 | static int |
4917 | linux_thread_stopped (struct thread_info *thread) | |
4918 | { | |
4919 | return get_thread_lwp (thread)->stopped; | |
4920 | } | |
4921 | ||
4922 | /* This exposes stop-all-threads functionality to other modules. */ | |
4923 | ||
4924 | static void | |
7984d532 | 4925 | linux_pause_all (int freeze) |
8336d594 | 4926 | { |
7984d532 PA |
4927 | stop_all_lwps (freeze, NULL); |
4928 | } | |
4929 | ||
4930 | /* This exposes unstop-all-threads functionality to other gdbserver | |
4931 | modules. */ | |
4932 | ||
4933 | static void | |
4934 | linux_unpause_all (int unfreeze) | |
4935 | { | |
4936 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
4937 | } |
4938 | ||
90d74c30 PA |
4939 | static int |
4940 | linux_prepare_to_access_memory (void) | |
4941 | { | |
4942 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
4943 | running LWP. */ | |
4944 | if (non_stop) | |
4945 | linux_pause_all (1); | |
4946 | return 0; | |
4947 | } | |
4948 | ||
4949 | static void | |
0146f85b | 4950 | linux_done_accessing_memory (void) |
90d74c30 PA |
4951 | { |
4952 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
4953 | running LWP. */ | |
4954 | if (non_stop) | |
4955 | linux_unpause_all (1); | |
4956 | } | |
4957 | ||
fa593d66 PA |
4958 | static int |
4959 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
4960 | CORE_ADDR collector, | |
4961 | CORE_ADDR lockaddr, | |
4962 | ULONGEST orig_size, | |
4963 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
4964 | CORE_ADDR *trampoline, |
4965 | ULONGEST *trampoline_size, | |
fa593d66 PA |
4966 | unsigned char *jjump_pad_insn, |
4967 | ULONGEST *jjump_pad_insn_size, | |
4968 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
4969 | CORE_ADDR *adjusted_insn_addr_end, |
4970 | char *err) | |
fa593d66 PA |
4971 | { |
4972 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
4973 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
4974 | jump_entry, trampoline, trampoline_size, |
4975 | jjump_pad_insn, jjump_pad_insn_size, | |
4976 | adjusted_insn_addr, adjusted_insn_addr_end, | |
4977 | err); | |
fa593d66 PA |
4978 | } |
4979 | ||
6a271cae PA |
4980 | static struct emit_ops * |
4981 | linux_emit_ops (void) | |
4982 | { | |
4983 | if (the_low_target.emit_ops != NULL) | |
4984 | return (*the_low_target.emit_ops) (); | |
4985 | else | |
4986 | return NULL; | |
4987 | } | |
4988 | ||
405f8e94 SS |
4989 | static int |
4990 | linux_get_min_fast_tracepoint_insn_len (void) | |
4991 | { | |
4992 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
4993 | } | |
4994 | ||
2268b414 JK |
4995 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
4996 | ||
4997 | static int | |
4998 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
4999 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5000 | { | |
5001 | char filename[PATH_MAX]; | |
5002 | int fd; | |
5003 | const int auxv_size = is_elf64 | |
5004 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5005 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5006 | ||
5007 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5008 | ||
5009 | fd = open (filename, O_RDONLY); | |
5010 | if (fd < 0) | |
5011 | return 1; | |
5012 | ||
5013 | *phdr_memaddr = 0; | |
5014 | *num_phdr = 0; | |
5015 | while (read (fd, buf, auxv_size) == auxv_size | |
5016 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5017 | { | |
5018 | if (is_elf64) | |
5019 | { | |
5020 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5021 | ||
5022 | switch (aux->a_type) | |
5023 | { | |
5024 | case AT_PHDR: | |
5025 | *phdr_memaddr = aux->a_un.a_val; | |
5026 | break; | |
5027 | case AT_PHNUM: | |
5028 | *num_phdr = aux->a_un.a_val; | |
5029 | break; | |
5030 | } | |
5031 | } | |
5032 | else | |
5033 | { | |
5034 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5035 | ||
5036 | switch (aux->a_type) | |
5037 | { | |
5038 | case AT_PHDR: | |
5039 | *phdr_memaddr = aux->a_un.a_val; | |
5040 | break; | |
5041 | case AT_PHNUM: | |
5042 | *num_phdr = aux->a_un.a_val; | |
5043 | break; | |
5044 | } | |
5045 | } | |
5046 | } | |
5047 | ||
5048 | close (fd); | |
5049 | ||
5050 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5051 | { | |
5052 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5053 | "phdr_memaddr = %ld, phdr_num = %d", | |
5054 | (long) *phdr_memaddr, *num_phdr); | |
5055 | return 2; | |
5056 | } | |
5057 | ||
5058 | return 0; | |
5059 | } | |
5060 | ||
5061 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5062 | ||
5063 | static CORE_ADDR | |
5064 | get_dynamic (const int pid, const int is_elf64) | |
5065 | { | |
5066 | CORE_ADDR phdr_memaddr, relocation; | |
5067 | int num_phdr, i; | |
5068 | unsigned char *phdr_buf; | |
5069 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5070 | ||
5071 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5072 | return 0; | |
5073 | ||
5074 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5075 | phdr_buf = alloca (num_phdr * phdr_size); | |
5076 | ||
5077 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5078 | return 0; | |
5079 | ||
5080 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5081 | non-zero for PIE ones. */ | |
5082 | relocation = -1; | |
5083 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5084 | if (is_elf64) | |
5085 | { | |
5086 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5087 | ||
5088 | if (p->p_type == PT_PHDR) | |
5089 | relocation = phdr_memaddr - p->p_vaddr; | |
5090 | } | |
5091 | else | |
5092 | { | |
5093 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5094 | ||
5095 | if (p->p_type == PT_PHDR) | |
5096 | relocation = phdr_memaddr - p->p_vaddr; | |
5097 | } | |
5098 | ||
5099 | if (relocation == -1) | |
5100 | { | |
5101 | warning ("Unexpected missing PT_PHDR"); | |
5102 | return 0; | |
5103 | } | |
5104 | ||
5105 | for (i = 0; i < num_phdr; i++) | |
5106 | { | |
5107 | if (is_elf64) | |
5108 | { | |
5109 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5110 | ||
5111 | if (p->p_type == PT_DYNAMIC) | |
5112 | return p->p_vaddr + relocation; | |
5113 | } | |
5114 | else | |
5115 | { | |
5116 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5117 | ||
5118 | if (p->p_type == PT_DYNAMIC) | |
5119 | return p->p_vaddr + relocation; | |
5120 | } | |
5121 | } | |
5122 | ||
5123 | return 0; | |
5124 | } | |
5125 | ||
5126 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
5127 | can be 0 if the inferior does not yet have the library list initialized. */ | |
5128 | ||
5129 | static CORE_ADDR | |
5130 | get_r_debug (const int pid, const int is_elf64) | |
5131 | { | |
5132 | CORE_ADDR dynamic_memaddr; | |
5133 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5134 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
5135 | ||
5136 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5137 | if (dynamic_memaddr == 0) | |
5138 | return (CORE_ADDR) -1; | |
5139 | ||
5140 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5141 | { | |
5142 | if (is_elf64) | |
5143 | { | |
5144 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
5145 | ||
5146 | if (dyn->d_tag == DT_DEBUG) | |
5147 | return dyn->d_un.d_val; | |
5148 | ||
5149 | if (dyn->d_tag == DT_NULL) | |
5150 | break; | |
5151 | } | |
5152 | else | |
5153 | { | |
5154 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
5155 | ||
5156 | if (dyn->d_tag == DT_DEBUG) | |
5157 | return dyn->d_un.d_val; | |
5158 | ||
5159 | if (dyn->d_tag == DT_NULL) | |
5160 | break; | |
5161 | } | |
5162 | ||
5163 | dynamic_memaddr += dyn_size; | |
5164 | } | |
5165 | ||
5166 | return (CORE_ADDR) -1; | |
5167 | } | |
5168 | ||
5169 | /* Read one pointer from MEMADDR in the inferior. */ | |
5170 | ||
5171 | static int | |
5172 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5173 | { | |
5174 | *ptr = 0; | |
5175 | return linux_read_memory (memaddr, (unsigned char *) ptr, ptr_size); | |
5176 | } | |
5177 | ||
5178 | struct link_map_offsets | |
5179 | { | |
5180 | /* Offset and size of r_debug.r_version. */ | |
5181 | int r_version_offset; | |
5182 | ||
5183 | /* Offset and size of r_debug.r_map. */ | |
5184 | int r_map_offset; | |
5185 | ||
5186 | /* Offset to l_addr field in struct link_map. */ | |
5187 | int l_addr_offset; | |
5188 | ||
5189 | /* Offset to l_name field in struct link_map. */ | |
5190 | int l_name_offset; | |
5191 | ||
5192 | /* Offset to l_ld field in struct link_map. */ | |
5193 | int l_ld_offset; | |
5194 | ||
5195 | /* Offset to l_next field in struct link_map. */ | |
5196 | int l_next_offset; | |
5197 | ||
5198 | /* Offset to l_prev field in struct link_map. */ | |
5199 | int l_prev_offset; | |
5200 | }; | |
5201 | ||
5202 | /* Construct qXfer:libraries:read reply. */ | |
5203 | ||
5204 | static int | |
5205 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5206 | unsigned const char *writebuf, | |
5207 | CORE_ADDR offset, int len) | |
5208 | { | |
5209 | char *document; | |
5210 | unsigned document_len; | |
5211 | struct process_info_private *const priv = current_process ()->private; | |
5212 | char filename[PATH_MAX]; | |
5213 | int pid, is_elf64; | |
5214 | ||
5215 | static const struct link_map_offsets lmo_32bit_offsets = | |
5216 | { | |
5217 | 0, /* r_version offset. */ | |
5218 | 4, /* r_debug.r_map offset. */ | |
5219 | 0, /* l_addr offset in link_map. */ | |
5220 | 4, /* l_name offset in link_map. */ | |
5221 | 8, /* l_ld offset in link_map. */ | |
5222 | 12, /* l_next offset in link_map. */ | |
5223 | 16 /* l_prev offset in link_map. */ | |
5224 | }; | |
5225 | ||
5226 | static const struct link_map_offsets lmo_64bit_offsets = | |
5227 | { | |
5228 | 0, /* r_version offset. */ | |
5229 | 8, /* r_debug.r_map offset. */ | |
5230 | 0, /* l_addr offset in link_map. */ | |
5231 | 8, /* l_name offset in link_map. */ | |
5232 | 16, /* l_ld offset in link_map. */ | |
5233 | 24, /* l_next offset in link_map. */ | |
5234 | 32 /* l_prev offset in link_map. */ | |
5235 | }; | |
5236 | const struct link_map_offsets *lmo; | |
5237 | ||
5238 | if (writebuf != NULL) | |
5239 | return -2; | |
5240 | if (readbuf == NULL) | |
5241 | return -1; | |
5242 | ||
5243 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5244 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
5245 | is_elf64 = elf_64_file_p (filename); | |
5246 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; | |
5247 | ||
5248 | if (priv->r_debug == 0) | |
5249 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5250 | ||
5251 | if (priv->r_debug == (CORE_ADDR) -1 || priv->r_debug == 0) | |
5252 | { | |
5253 | document = xstrdup ("<library-list-svr4 version=\"1.0\"/>\n"); | |
5254 | } | |
5255 | else | |
5256 | { | |
5257 | int allocated = 1024; | |
5258 | char *p; | |
5259 | const int ptr_size = is_elf64 ? 8 : 4; | |
5260 | CORE_ADDR lm_addr, lm_prev, l_name, l_addr, l_ld, l_next, l_prev; | |
5261 | int r_version, header_done = 0; | |
5262 | ||
5263 | document = xmalloc (allocated); | |
5264 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5265 | p = document + strlen (document); | |
5266 | ||
5267 | r_version = 0; | |
5268 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, | |
5269 | (unsigned char *) &r_version, | |
5270 | sizeof (r_version)) != 0 | |
5271 | || r_version != 1) | |
5272 | { | |
5273 | warning ("unexpected r_debug version %d", r_version); | |
5274 | goto done; | |
5275 | } | |
5276 | ||
5277 | if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5278 | &lm_addr, ptr_size) != 0) | |
5279 | { | |
5280 | warning ("unable to read r_map from 0x%lx", | |
5281 | (long) priv->r_debug + lmo->r_map_offset); | |
5282 | goto done; | |
5283 | } | |
5284 | ||
5285 | lm_prev = 0; | |
5286 | while (read_one_ptr (lm_addr + lmo->l_name_offset, | |
5287 | &l_name, ptr_size) == 0 | |
5288 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5289 | &l_addr, ptr_size) == 0 | |
5290 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5291 | &l_ld, ptr_size) == 0 | |
5292 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5293 | &l_prev, ptr_size) == 0 | |
5294 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5295 | &l_next, ptr_size) == 0) | |
5296 | { | |
5297 | unsigned char libname[PATH_MAX]; | |
5298 | ||
5299 | if (lm_prev != l_prev) | |
5300 | { | |
5301 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", | |
5302 | (long) lm_prev, (long) l_prev); | |
5303 | break; | |
5304 | } | |
5305 | ||
5306 | /* Not checking for error because reading may stop before | |
5307 | we've got PATH_MAX worth of characters. */ | |
5308 | libname[0] = '\0'; | |
5309 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5310 | libname[sizeof (libname) - 1] = '\0'; | |
5311 | if (libname[0] != '\0') | |
5312 | { | |
5313 | /* 6x the size for xml_escape_text below. */ | |
5314 | size_t len = 6 * strlen ((char *) libname); | |
5315 | char *name; | |
5316 | ||
5317 | if (!header_done) | |
5318 | { | |
5319 | /* Terminate `<library-list-svr4'. */ | |
5320 | *p++ = '>'; | |
5321 | header_done = 1; | |
5322 | } | |
5323 | ||
5324 | while (allocated < p - document + len + 200) | |
5325 | { | |
5326 | /* Expand to guarantee sufficient storage. */ | |
5327 | uintptr_t document_len = p - document; | |
5328 | ||
5329 | document = xrealloc (document, 2 * allocated); | |
5330 | allocated *= 2; | |
5331 | p = document + document_len; | |
5332 | } | |
5333 | ||
5334 | name = xml_escape_text ((char *) libname); | |
5335 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5336 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5337 | name, (unsigned long) lm_addr, | |
5338 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5339 | free (name); | |
5340 | } | |
5341 | else if (lm_prev == 0) | |
5342 | { | |
5343 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); | |
5344 | p = p + strlen (p); | |
5345 | } | |
5346 | ||
5347 | if (l_next == 0) | |
5348 | break; | |
5349 | ||
5350 | lm_prev = lm_addr; | |
5351 | lm_addr = l_next; | |
5352 | } | |
5353 | done: | |
5354 | strcpy (p, "</library-list-svr4>"); | |
5355 | } | |
5356 | ||
5357 | document_len = strlen (document); | |
5358 | if (offset < document_len) | |
5359 | document_len -= offset; | |
5360 | else | |
5361 | document_len = 0; | |
5362 | if (len > document_len) | |
5363 | len = document_len; | |
5364 | ||
5365 | memcpy (readbuf, document + offset, len); | |
5366 | xfree (document); | |
5367 | ||
5368 | return len; | |
5369 | } | |
5370 | ||
ce3a066d DJ |
5371 | static struct target_ops linux_target_ops = { |
5372 | linux_create_inferior, | |
5373 | linux_attach, | |
5374 | linux_kill, | |
6ad8ae5c | 5375 | linux_detach, |
8336d594 | 5376 | linux_mourn, |
444d6139 | 5377 | linux_join, |
ce3a066d DJ |
5378 | linux_thread_alive, |
5379 | linux_resume, | |
5380 | linux_wait, | |
5381 | linux_fetch_registers, | |
5382 | linux_store_registers, | |
90d74c30 | 5383 | linux_prepare_to_access_memory, |
0146f85b | 5384 | linux_done_accessing_memory, |
ce3a066d DJ |
5385 | linux_read_memory, |
5386 | linux_write_memory, | |
2f2893d9 | 5387 | linux_look_up_symbols, |
ef57601b | 5388 | linux_request_interrupt, |
aa691b87 | 5389 | linux_read_auxv, |
d993e290 PA |
5390 | linux_insert_point, |
5391 | linux_remove_point, | |
e013ee27 OF |
5392 | linux_stopped_by_watchpoint, |
5393 | linux_stopped_data_address, | |
42c81e2a | 5394 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 5395 | linux_read_offsets, |
dae5f5cf DJ |
5396 | #else |
5397 | NULL, | |
5398 | #endif | |
5399 | #ifdef USE_THREAD_DB | |
5400 | thread_db_get_tls_address, | |
5401 | #else | |
5402 | NULL, | |
52fb6437 | 5403 | #endif |
efcbbd14 | 5404 | linux_qxfer_spu, |
59a016f0 | 5405 | hostio_last_error_from_errno, |
07e059b5 | 5406 | linux_qxfer_osdata, |
4aa995e1 | 5407 | linux_xfer_siginfo, |
bd99dc85 PA |
5408 | linux_supports_non_stop, |
5409 | linux_async, | |
5410 | linux_start_non_stop, | |
cdbfd419 PP |
5411 | linux_supports_multi_process, |
5412 | #ifdef USE_THREAD_DB | |
dc146f7c | 5413 | thread_db_handle_monitor_command, |
cdbfd419 | 5414 | #else |
dc146f7c | 5415 | NULL, |
cdbfd419 | 5416 | #endif |
d26e3629 | 5417 | linux_common_core_of_thread, |
78d85199 | 5418 | linux_read_loadmap, |
219f2f23 PA |
5419 | linux_process_qsupported, |
5420 | linux_supports_tracepoints, | |
5421 | linux_read_pc, | |
8336d594 PA |
5422 | linux_write_pc, |
5423 | linux_thread_stopped, | |
7984d532 | 5424 | NULL, |
711e434b | 5425 | linux_pause_all, |
7984d532 | 5426 | linux_unpause_all, |
fa593d66 PA |
5427 | linux_cancel_breakpoints, |
5428 | linux_stabilize_threads, | |
6a271cae | 5429 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
5430 | linux_emit_ops, |
5431 | linux_supports_disable_randomization, | |
405f8e94 | 5432 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 5433 | linux_qxfer_libraries_svr4, |
ce3a066d DJ |
5434 | }; |
5435 | ||
0d62e5e8 DJ |
5436 | static void |
5437 | linux_init_signals () | |
5438 | { | |
5439 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5440 | to find what the cancel signal actually is. */ | |
1a981360 | 5441 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5442 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5443 | #endif |
0d62e5e8 DJ |
5444 | } |
5445 | ||
da6d8c04 DJ |
5446 | void |
5447 | initialize_low (void) | |
5448 | { | |
bd99dc85 PA |
5449 | struct sigaction sigchld_action; |
5450 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5451 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5452 | set_breakpoint_data (the_low_target.breakpoint, |
5453 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5454 | linux_init_signals (); |
24a09b5f | 5455 | linux_test_for_tracefork (); |
52fa2412 UW |
5456 | #ifdef HAVE_LINUX_REGSETS |
5457 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
5458 | ; | |
bca929d3 | 5459 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 5460 | #endif |
bd99dc85 PA |
5461 | |
5462 | sigchld_action.sa_handler = sigchld_handler; | |
5463 | sigemptyset (&sigchld_action.sa_mask); | |
5464 | sigchld_action.sa_flags = SA_RESTART; | |
5465 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 5466 | } |