Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
0b302171 | 2 | Copyright (C) 1995-1996, 1998-2012 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
d26e3629 | 21 | #include "linux-osdata.h" |
58b4daa5 | 22 | #include "agent.h" |
da6d8c04 | 23 | |
58caa3dc | 24 | #include <sys/wait.h> |
da6d8c04 DJ |
25 | #include <stdio.h> |
26 | #include <sys/param.h> | |
da6d8c04 | 27 | #include <sys/ptrace.h> |
af96c192 | 28 | #include "linux-ptrace.h" |
e3deef73 | 29 | #include "linux-procfs.h" |
da6d8c04 DJ |
30 | #include <signal.h> |
31 | #include <sys/ioctl.h> | |
32 | #include <fcntl.h> | |
d07c63e7 | 33 | #include <string.h> |
0a30fbc4 DJ |
34 | #include <stdlib.h> |
35 | #include <unistd.h> | |
fa6a77dc | 36 | #include <errno.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
efcbbd14 UW |
43 | #include <sys/stat.h> |
44 | #include <sys/vfs.h> | |
1570b33e | 45 | #include <sys/uio.h> |
957f3f49 DE |
46 | #ifndef ELFMAG0 |
47 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
48 | then ELFMAG0 will have been defined. If it didn't get included by | |
49 | gdb_proc_service.h then including it will likely introduce a duplicate | |
50 | definition of elf_fpregset_t. */ | |
51 | #include <elf.h> | |
52 | #endif | |
efcbbd14 UW |
53 | |
54 | #ifndef SPUFS_MAGIC | |
55 | #define SPUFS_MAGIC 0x23c9b64e | |
56 | #endif | |
da6d8c04 | 57 | |
03583c20 UW |
58 | #ifdef HAVE_PERSONALITY |
59 | # include <sys/personality.h> | |
60 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
61 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
62 | # endif | |
63 | #endif | |
64 | ||
fd462a61 DJ |
65 | #ifndef O_LARGEFILE |
66 | #define O_LARGEFILE 0 | |
67 | #endif | |
68 | ||
ec8ebe72 DE |
69 | #ifndef W_STOPCODE |
70 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
71 | #endif | |
72 | ||
1a981360 PA |
73 | /* This is the kernel's hard limit. Not to be confused with |
74 | SIGRTMIN. */ | |
75 | #ifndef __SIGRTMIN | |
76 | #define __SIGRTMIN 32 | |
77 | #endif | |
78 | ||
42c81e2a DJ |
79 | #ifdef __UCLIBC__ |
80 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
81 | #define HAS_NOMMU | |
82 | #endif | |
83 | #endif | |
84 | ||
8365dcf5 TJB |
85 | #ifndef HAVE_ELF32_AUXV_T |
86 | /* Copied from glibc's elf.h. */ | |
87 | typedef struct | |
88 | { | |
89 | uint32_t a_type; /* Entry type */ | |
90 | union | |
91 | { | |
92 | uint32_t a_val; /* Integer value */ | |
93 | /* We use to have pointer elements added here. We cannot do that, | |
94 | though, since it does not work when using 32-bit definitions | |
95 | on 64-bit platforms and vice versa. */ | |
96 | } a_un; | |
97 | } Elf32_auxv_t; | |
98 | #endif | |
99 | ||
100 | #ifndef HAVE_ELF64_AUXV_T | |
101 | /* Copied from glibc's elf.h. */ | |
102 | typedef struct | |
103 | { | |
104 | uint64_t a_type; /* Entry type */ | |
105 | union | |
106 | { | |
107 | uint64_t a_val; /* Integer value */ | |
108 | /* We use to have pointer elements added here. We cannot do that, | |
109 | though, since it does not work when using 32-bit definitions | |
110 | on 64-bit platforms and vice versa. */ | |
111 | } a_un; | |
112 | } Elf64_auxv_t; | |
113 | #endif | |
114 | ||
24a09b5f DJ |
115 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
116 | representation of the thread ID. | |
611cb4a5 | 117 | |
54a0b537 | 118 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
119 | the same as the LWP ID. |
120 | ||
121 | ``all_processes'' is keyed by the "overall process ID", which | |
122 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 123 | |
54a0b537 | 124 | struct inferior_list all_lwps; |
0d62e5e8 | 125 | |
05044653 PA |
126 | /* A list of all unknown processes which receive stop signals. Some |
127 | other process will presumably claim each of these as forked | |
128 | children momentarily. */ | |
24a09b5f | 129 | |
05044653 PA |
130 | struct simple_pid_list |
131 | { | |
132 | /* The process ID. */ | |
133 | int pid; | |
134 | ||
135 | /* The status as reported by waitpid. */ | |
136 | int status; | |
137 | ||
138 | /* Next in chain. */ | |
139 | struct simple_pid_list *next; | |
140 | }; | |
141 | struct simple_pid_list *stopped_pids; | |
142 | ||
143 | /* Trivial list manipulation functions to keep track of a list of new | |
144 | stopped processes. */ | |
145 | ||
146 | static void | |
147 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
148 | { | |
149 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
150 | ||
151 | new_pid->pid = pid; | |
152 | new_pid->status = status; | |
153 | new_pid->next = *listp; | |
154 | *listp = new_pid; | |
155 | } | |
156 | ||
157 | static int | |
158 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
159 | { | |
160 | struct simple_pid_list **p; | |
161 | ||
162 | for (p = listp; *p != NULL; p = &(*p)->next) | |
163 | if ((*p)->pid == pid) | |
164 | { | |
165 | struct simple_pid_list *next = (*p)->next; | |
166 | ||
167 | *statusp = (*p)->status; | |
168 | xfree (*p); | |
169 | *p = next; | |
170 | return 1; | |
171 | } | |
172 | return 0; | |
173 | } | |
24a09b5f | 174 | |
0d62e5e8 DJ |
175 | /* FIXME this is a bit of a hack, and could be removed. */ |
176 | int stopping_threads; | |
177 | ||
178 | /* FIXME make into a target method? */ | |
24a09b5f | 179 | int using_threads = 1; |
24a09b5f | 180 | |
fa593d66 PA |
181 | /* True if we're presently stabilizing threads (moving them out of |
182 | jump pads). */ | |
183 | static int stabilizing_threads; | |
184 | ||
95954743 PA |
185 | /* This flag is true iff we've just created or attached to our first |
186 | inferior but it has not stopped yet. As soon as it does, we need | |
187 | to call the low target's arch_setup callback. Doing this only on | |
188 | the first inferior avoids reinializing the architecture on every | |
189 | inferior, and avoids messing with the register caches of the | |
190 | already running inferiors. NOTE: this assumes all inferiors under | |
191 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
192 | static int new_inferior; |
193 | ||
2acc282a | 194 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 195 | int step, int signal, siginfo_t *info); |
2bd7c093 | 196 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
197 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
198 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 199 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 200 | static void *add_lwp (ptid_t ptid); |
c35fafde | 201 | static int linux_stopped_by_watchpoint (void); |
95954743 | 202 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 203 | static void proceed_all_lwps (void); |
d50171e4 PA |
204 | static int finish_step_over (struct lwp_info *lwp); |
205 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
206 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 207 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
208 | |
209 | /* True if the low target can hardware single-step. Such targets | |
210 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
211 | ||
212 | static int | |
213 | can_hardware_single_step (void) | |
214 | { | |
215 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
216 | } | |
217 | ||
218 | /* True if the low target supports memory breakpoints. If so, we'll | |
219 | have a GET_PC implementation. */ | |
220 | ||
221 | static int | |
222 | supports_breakpoints (void) | |
223 | { | |
224 | return (the_low_target.get_pc != NULL); | |
225 | } | |
0d62e5e8 | 226 | |
fa593d66 PA |
227 | /* Returns true if this target can support fast tracepoints. This |
228 | does not mean that the in-process agent has been loaded in the | |
229 | inferior. */ | |
230 | ||
231 | static int | |
232 | supports_fast_tracepoints (void) | |
233 | { | |
234 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
235 | } | |
236 | ||
0d62e5e8 DJ |
237 | struct pending_signals |
238 | { | |
239 | int signal; | |
32ca6d61 | 240 | siginfo_t info; |
0d62e5e8 DJ |
241 | struct pending_signals *prev; |
242 | }; | |
611cb4a5 | 243 | |
14ce3065 DE |
244 | #define PTRACE_ARG3_TYPE void * |
245 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 246 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 247 | |
58caa3dc | 248 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
249 | static char *disabled_regsets; |
250 | static int num_regsets; | |
58caa3dc DJ |
251 | #endif |
252 | ||
bd99dc85 PA |
253 | /* The read/write ends of the pipe registered as waitable file in the |
254 | event loop. */ | |
255 | static int linux_event_pipe[2] = { -1, -1 }; | |
256 | ||
257 | /* True if we're currently in async mode. */ | |
258 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
259 | ||
02fc4de7 | 260 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
261 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
262 | ||
d0722149 DE |
263 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
264 | ||
265 | static int | |
957f3f49 | 266 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
267 | { |
268 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
269 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
270 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
271 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
272 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
273 | } | |
274 | ||
275 | /* Return non-zero if FILE is a 64-bit ELF file, | |
276 | zero if the file is not a 64-bit ELF file, | |
277 | and -1 if the file is not accessible or doesn't exist. */ | |
278 | ||
be07f1a2 | 279 | static int |
d0722149 DE |
280 | elf_64_file_p (const char *file) |
281 | { | |
957f3f49 | 282 | Elf64_Ehdr header; |
d0722149 DE |
283 | int fd; |
284 | ||
285 | fd = open (file, O_RDONLY); | |
286 | if (fd < 0) | |
287 | return -1; | |
288 | ||
289 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
290 | { | |
291 | close (fd); | |
292 | return 0; | |
293 | } | |
294 | close (fd); | |
295 | ||
296 | return elf_64_header_p (&header); | |
297 | } | |
298 | ||
be07f1a2 PA |
299 | /* Accepts an integer PID; Returns true if the executable PID is |
300 | running is a 64-bit ELF file.. */ | |
301 | ||
302 | int | |
303 | linux_pid_exe_is_elf_64_file (int pid) | |
304 | { | |
305 | char file[MAXPATHLEN]; | |
306 | ||
307 | sprintf (file, "/proc/%d/exe", pid); | |
308 | return elf_64_file_p (file); | |
309 | } | |
310 | ||
bd99dc85 PA |
311 | static void |
312 | delete_lwp (struct lwp_info *lwp) | |
313 | { | |
314 | remove_thread (get_lwp_thread (lwp)); | |
315 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 316 | free (lwp->arch_private); |
bd99dc85 PA |
317 | free (lwp); |
318 | } | |
319 | ||
95954743 PA |
320 | /* Add a process to the common process list, and set its private |
321 | data. */ | |
322 | ||
323 | static struct process_info * | |
324 | linux_add_process (int pid, int attached) | |
325 | { | |
326 | struct process_info *proc; | |
327 | ||
328 | /* Is this the first process? If so, then set the arch. */ | |
329 | if (all_processes.head == NULL) | |
330 | new_inferior = 1; | |
331 | ||
332 | proc = add_process (pid, attached); | |
333 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
334 | ||
aa5ca48f DE |
335 | if (the_low_target.new_process != NULL) |
336 | proc->private->arch_private = the_low_target.new_process (); | |
337 | ||
95954743 PA |
338 | return proc; |
339 | } | |
340 | ||
07d4f67e DE |
341 | /* Wrapper function for waitpid which handles EINTR, and emulates |
342 | __WALL for systems where that is not available. */ | |
343 | ||
344 | static int | |
345 | my_waitpid (int pid, int *status, int flags) | |
346 | { | |
347 | int ret, out_errno; | |
348 | ||
349 | if (debug_threads) | |
350 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
351 | ||
352 | if (flags & __WALL) | |
353 | { | |
354 | sigset_t block_mask, org_mask, wake_mask; | |
355 | int wnohang; | |
356 | ||
357 | wnohang = (flags & WNOHANG) != 0; | |
358 | flags &= ~(__WALL | __WCLONE); | |
359 | flags |= WNOHANG; | |
360 | ||
361 | /* Block all signals while here. This avoids knowing about | |
362 | LinuxThread's signals. */ | |
363 | sigfillset (&block_mask); | |
364 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
365 | ||
366 | /* ... except during the sigsuspend below. */ | |
367 | sigemptyset (&wake_mask); | |
368 | ||
369 | while (1) | |
370 | { | |
371 | /* Since all signals are blocked, there's no need to check | |
372 | for EINTR here. */ | |
373 | ret = waitpid (pid, status, flags); | |
374 | out_errno = errno; | |
375 | ||
376 | if (ret == -1 && out_errno != ECHILD) | |
377 | break; | |
378 | else if (ret > 0) | |
379 | break; | |
380 | ||
381 | if (flags & __WCLONE) | |
382 | { | |
383 | /* We've tried both flavors now. If WNOHANG is set, | |
384 | there's nothing else to do, just bail out. */ | |
385 | if (wnohang) | |
386 | break; | |
387 | ||
388 | if (debug_threads) | |
389 | fprintf (stderr, "blocking\n"); | |
390 | ||
391 | /* Block waiting for signals. */ | |
392 | sigsuspend (&wake_mask); | |
393 | } | |
394 | ||
395 | flags ^= __WCLONE; | |
396 | } | |
397 | ||
398 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
399 | } | |
400 | else | |
401 | { | |
402 | do | |
403 | ret = waitpid (pid, status, flags); | |
404 | while (ret == -1 && errno == EINTR); | |
405 | out_errno = errno; | |
406 | } | |
407 | ||
408 | if (debug_threads) | |
409 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
410 | pid, flags, status ? *status : -1, ret); | |
411 | ||
412 | errno = out_errno; | |
413 | return ret; | |
414 | } | |
415 | ||
bd99dc85 PA |
416 | /* Handle a GNU/Linux extended wait response. If we see a clone |
417 | event, we need to add the new LWP to our list (and not report the | |
418 | trap to higher layers). */ | |
0d62e5e8 | 419 | |
24a09b5f | 420 | static void |
54a0b537 | 421 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
422 | { |
423 | int event = wstat >> 16; | |
54a0b537 | 424 | struct lwp_info *new_lwp; |
24a09b5f DJ |
425 | |
426 | if (event == PTRACE_EVENT_CLONE) | |
427 | { | |
95954743 | 428 | ptid_t ptid; |
24a09b5f | 429 | unsigned long new_pid; |
05044653 | 430 | int ret, status; |
24a09b5f | 431 | |
bd99dc85 | 432 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
433 | |
434 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 435 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
436 | { |
437 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
438 | hits the SIGSTOP, but we're already attached. */ | |
439 | ||
97438e3f | 440 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
441 | |
442 | if (ret == -1) | |
443 | perror_with_name ("waiting for new child"); | |
444 | else if (ret != new_pid) | |
445 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 446 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
447 | warning ("wait returned unexpected status 0x%x", status); |
448 | } | |
449 | ||
1e7fc18c | 450 | linux_enable_event_reporting (new_pid); |
24a09b5f | 451 | |
95954743 PA |
452 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
453 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
454 | add_thread (ptid, new_lwp); | |
24a09b5f | 455 | |
e27d73f6 DE |
456 | /* Either we're going to immediately resume the new thread |
457 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
458 | thinks the thread is currently running, so set this first | |
459 | before calling linux_resume_one_lwp. */ | |
460 | new_lwp->stopped = 1; | |
461 | ||
da5898ce DJ |
462 | /* Normally we will get the pending SIGSTOP. But in some cases |
463 | we might get another signal delivered to the group first. | |
f21cc1a2 | 464 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
465 | if (WSTOPSIG (status) == SIGSTOP) |
466 | { | |
d50171e4 PA |
467 | if (stopping_threads) |
468 | new_lwp->stop_pc = get_stop_pc (new_lwp); | |
469 | else | |
e27d73f6 | 470 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 471 | } |
24a09b5f | 472 | else |
da5898ce | 473 | { |
54a0b537 | 474 | new_lwp->stop_expected = 1; |
d50171e4 | 475 | |
da5898ce DJ |
476 | if (stopping_threads) |
477 | { | |
d50171e4 | 478 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
479 | new_lwp->status_pending_p = 1; |
480 | new_lwp->status_pending = status; | |
da5898ce DJ |
481 | } |
482 | else | |
483 | /* Pass the signal on. This is what GDB does - except | |
484 | shouldn't we really report it instead? */ | |
e27d73f6 | 485 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 486 | } |
24a09b5f DJ |
487 | |
488 | /* Always resume the current thread. If we are stopping | |
489 | threads, it will have a pending SIGSTOP; we may as well | |
490 | collect it now. */ | |
2acc282a | 491 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
492 | } |
493 | } | |
494 | ||
d50171e4 PA |
495 | /* Return the PC as read from the regcache of LWP, without any |
496 | adjustment. */ | |
497 | ||
498 | static CORE_ADDR | |
499 | get_pc (struct lwp_info *lwp) | |
500 | { | |
501 | struct thread_info *saved_inferior; | |
502 | struct regcache *regcache; | |
503 | CORE_ADDR pc; | |
504 | ||
505 | if (the_low_target.get_pc == NULL) | |
506 | return 0; | |
507 | ||
508 | saved_inferior = current_inferior; | |
509 | current_inferior = get_lwp_thread (lwp); | |
510 | ||
511 | regcache = get_thread_regcache (current_inferior, 1); | |
512 | pc = (*the_low_target.get_pc) (regcache); | |
513 | ||
514 | if (debug_threads) | |
515 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
516 | ||
517 | current_inferior = saved_inferior; | |
518 | return pc; | |
519 | } | |
520 | ||
521 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
522 | The SIGTRAP could mean several things. |
523 | ||
524 | On i386, where decr_pc_after_break is non-zero: | |
525 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
526 | we will get only the one SIGTRAP (even if the instruction we | |
527 | stepped over was a breakpoint). The value of $eip will be the | |
528 | next instruction. | |
529 | If we continue the process using PTRACE_CONT, we will get a | |
530 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
531 | the instruction after the breakpoint (i.e. needs to be | |
532 | decremented). If we report the SIGTRAP to GDB, we must also | |
533 | report the undecremented PC. If we cancel the SIGTRAP, we | |
534 | must resume at the decremented PC. | |
535 | ||
536 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
537 | with hardware or kernel single-step: | |
538 | If we single-step over a breakpoint instruction, our PC will | |
539 | point at the following instruction. If we continue and hit a | |
540 | breakpoint instruction, our PC will point at the breakpoint | |
541 | instruction. */ | |
542 | ||
543 | static CORE_ADDR | |
d50171e4 | 544 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 545 | { |
d50171e4 PA |
546 | CORE_ADDR stop_pc; |
547 | ||
548 | if (the_low_target.get_pc == NULL) | |
549 | return 0; | |
0d62e5e8 | 550 | |
d50171e4 PA |
551 | stop_pc = get_pc (lwp); |
552 | ||
bdabb078 PA |
553 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
554 | && !lwp->stepping | |
555 | && !lwp->stopped_by_watchpoint | |
556 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
557 | stop_pc -= the_low_target.decr_pc_after_break; |
558 | ||
559 | if (debug_threads) | |
560 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
561 | ||
562 | return stop_pc; | |
0d62e5e8 | 563 | } |
ce3a066d | 564 | |
0d62e5e8 | 565 | static void * |
95954743 | 566 | add_lwp (ptid_t ptid) |
611cb4a5 | 567 | { |
54a0b537 | 568 | struct lwp_info *lwp; |
0d62e5e8 | 569 | |
54a0b537 PA |
570 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
571 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 572 | |
95954743 | 573 | lwp->head.id = ptid; |
0d62e5e8 | 574 | |
aa5ca48f DE |
575 | if (the_low_target.new_thread != NULL) |
576 | lwp->arch_private = the_low_target.new_thread (); | |
577 | ||
54a0b537 | 578 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 579 | |
54a0b537 | 580 | return lwp; |
0d62e5e8 | 581 | } |
611cb4a5 | 582 | |
da6d8c04 DJ |
583 | /* Start an inferior process and returns its pid. |
584 | ALLARGS is a vector of program-name and args. */ | |
585 | ||
ce3a066d DJ |
586 | static int |
587 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 588 | { |
03583c20 UW |
589 | #ifdef HAVE_PERSONALITY |
590 | int personality_orig = 0, personality_set = 0; | |
591 | #endif | |
a6dbe5df | 592 | struct lwp_info *new_lwp; |
da6d8c04 | 593 | int pid; |
95954743 | 594 | ptid_t ptid; |
da6d8c04 | 595 | |
03583c20 UW |
596 | #ifdef HAVE_PERSONALITY |
597 | if (disable_randomization) | |
598 | { | |
599 | errno = 0; | |
600 | personality_orig = personality (0xffffffff); | |
601 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
602 | { | |
603 | personality_set = 1; | |
604 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
605 | } | |
606 | if (errno != 0 || (personality_set | |
607 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
608 | warning ("Error disabling address space randomization: %s", | |
609 | strerror (errno)); | |
610 | } | |
611 | #endif | |
612 | ||
42c81e2a | 613 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
614 | pid = vfork (); |
615 | #else | |
da6d8c04 | 616 | pid = fork (); |
52fb6437 | 617 | #endif |
da6d8c04 DJ |
618 | if (pid < 0) |
619 | perror_with_name ("fork"); | |
620 | ||
621 | if (pid == 0) | |
622 | { | |
623 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
624 | ||
1a981360 | 625 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 626 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 627 | #endif |
0d62e5e8 | 628 | |
a9fa9f7d DJ |
629 | setpgid (0, 0); |
630 | ||
e0f9f062 DE |
631 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
632 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
633 | Also, redirect stdin to /dev/null. */ | |
634 | if (remote_connection_is_stdio ()) | |
635 | { | |
636 | close (0); | |
637 | open ("/dev/null", O_RDONLY); | |
638 | dup2 (2, 1); | |
3e52c33d JK |
639 | if (write (2, "stdin/stdout redirected\n", |
640 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
641 | /* Errors ignored. */; | |
e0f9f062 DE |
642 | } |
643 | ||
2b876972 DJ |
644 | execv (program, allargs); |
645 | if (errno == ENOENT) | |
646 | execvp (program, allargs); | |
da6d8c04 DJ |
647 | |
648 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 649 | strerror (errno)); |
da6d8c04 DJ |
650 | fflush (stderr); |
651 | _exit (0177); | |
652 | } | |
653 | ||
03583c20 UW |
654 | #ifdef HAVE_PERSONALITY |
655 | if (personality_set) | |
656 | { | |
657 | errno = 0; | |
658 | personality (personality_orig); | |
659 | if (errno != 0) | |
660 | warning ("Error restoring address space randomization: %s", | |
661 | strerror (errno)); | |
662 | } | |
663 | #endif | |
664 | ||
95954743 PA |
665 | linux_add_process (pid, 0); |
666 | ||
667 | ptid = ptid_build (pid, pid, 0); | |
668 | new_lwp = add_lwp (ptid); | |
669 | add_thread (ptid, new_lwp); | |
a6dbe5df | 670 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 671 | |
a9fa9f7d | 672 | return pid; |
da6d8c04 DJ |
673 | } |
674 | ||
675 | /* Attach to an inferior process. */ | |
676 | ||
95954743 PA |
677 | static void |
678 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 679 | { |
95954743 | 680 | ptid_t ptid; |
54a0b537 | 681 | struct lwp_info *new_lwp; |
611cb4a5 | 682 | |
95954743 | 683 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 684 | { |
87b0bb13 JK |
685 | struct buffer buffer; |
686 | ||
95954743 | 687 | if (!initial) |
2d717e4f DJ |
688 | { |
689 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 690 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
691 | strerror (errno), errno); |
692 | fflush (stderr); | |
693 | return; | |
694 | } | |
5f572dec JK |
695 | |
696 | /* If we fail to attach to a process, report an error. */ | |
87b0bb13 JK |
697 | buffer_init (&buffer); |
698 | linux_ptrace_attach_warnings (lwpid, &buffer); | |
699 | buffer_grow_str0 (&buffer, ""); | |
700 | error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer), | |
701 | lwpid, strerror (errno), errno); | |
da6d8c04 DJ |
702 | } |
703 | ||
95954743 | 704 | if (initial) |
e3deef73 LM |
705 | /* If lwp is the tgid, we handle adding existing threads later. |
706 | Otherwise we just add lwp without bothering about any other | |
707 | threads. */ | |
95954743 PA |
708 | ptid = ptid_build (lwpid, lwpid, 0); |
709 | else | |
710 | { | |
711 | /* Note that extracting the pid from the current inferior is | |
712 | safe, since we're always called in the context of the same | |
713 | process as this new thread. */ | |
714 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
715 | ptid = ptid_build (pid, lwpid, 0); | |
716 | } | |
24a09b5f | 717 | |
95954743 PA |
718 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
719 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 720 | |
a6dbe5df PA |
721 | /* We need to wait for SIGSTOP before being able to make the next |
722 | ptrace call on this LWP. */ | |
723 | new_lwp->must_set_ptrace_flags = 1; | |
724 | ||
644cebc9 | 725 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
726 | { |
727 | if (debug_threads) | |
728 | fprintf (stderr, | |
729 | "Attached to a stopped process\n"); | |
730 | ||
731 | /* The process is definitely stopped. It is in a job control | |
732 | stop, unless the kernel predates the TASK_STOPPED / | |
733 | TASK_TRACED distinction, in which case it might be in a | |
734 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
735 | can kill it, signal it, et cetera. | |
736 | ||
737 | First make sure there is a pending SIGSTOP. Since we are | |
738 | already attached, the process can not transition from stopped | |
739 | to running without a PTRACE_CONT; so we know this signal will | |
740 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
741 | probably already in the queue (unless this kernel is old | |
742 | enough to use TASK_STOPPED for ptrace stops); but since | |
743 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
744 | kill_lwp (lwpid, SIGSTOP); | |
745 | ||
746 | /* Finally, resume the stopped process. This will deliver the | |
747 | SIGSTOP (or a higher priority signal, just like normal | |
748 | PTRACE_ATTACH), which we'll catch later on. */ | |
749 | ptrace (PTRACE_CONT, lwpid, 0, 0); | |
750 | } | |
751 | ||
0d62e5e8 | 752 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
753 | brings it to a halt. |
754 | ||
755 | There are several cases to consider here: | |
756 | ||
757 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 758 | of a new thread that is being created. |
d50171e4 PA |
759 | In this case we should ignore that SIGSTOP and resume the |
760 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 761 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 762 | resume_continue. |
0e21c1ec DE |
763 | |
764 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
765 | to it via attach_inferior. |
766 | In this case we want the process thread to stop. | |
d50171e4 PA |
767 | This is handled by having linux_attach set last_resume_kind == |
768 | resume_stop after we return. | |
e3deef73 LM |
769 | |
770 | If the pid we are attaching to is also the tgid, we attach to and | |
771 | stop all the existing threads. Otherwise, we attach to pid and | |
772 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
773 | |
774 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
775 | existing threads. |
776 | In this case we want the thread to stop. | |
777 | FIXME: This case is currently not properly handled. | |
778 | We should wait for the SIGSTOP but don't. Things work apparently | |
779 | because enough time passes between when we ptrace (ATTACH) and when | |
780 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
781 | |
782 | On the other hand, if we are currently trying to stop all threads, we | |
783 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 784 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
785 | end of the list, and so the new thread has not yet reached |
786 | wait_for_sigstop (but will). */ | |
d50171e4 | 787 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
788 | } |
789 | ||
95954743 PA |
790 | void |
791 | linux_attach_lwp (unsigned long lwpid) | |
792 | { | |
793 | linux_attach_lwp_1 (lwpid, 0); | |
794 | } | |
795 | ||
e3deef73 LM |
796 | /* Attach to PID. If PID is the tgid, attach to it and all |
797 | of its threads. */ | |
798 | ||
0d62e5e8 | 799 | int |
a1928bad | 800 | linux_attach (unsigned long pid) |
0d62e5e8 | 801 | { |
e3deef73 LM |
802 | /* Attach to PID. We will check for other threads |
803 | soon. */ | |
95954743 | 804 | linux_attach_lwp_1 (pid, 1); |
95954743 | 805 | linux_add_process (pid, 1); |
0d62e5e8 | 806 | |
bd99dc85 PA |
807 | if (!non_stop) |
808 | { | |
8336d594 PA |
809 | struct thread_info *thread; |
810 | ||
811 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
812 | process. It will be collected by wait shortly. */ | |
813 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
814 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 815 | } |
0d62e5e8 | 816 | |
e3deef73 LM |
817 | if (linux_proc_get_tgid (pid) == pid) |
818 | { | |
819 | DIR *dir; | |
820 | char pathname[128]; | |
821 | ||
822 | sprintf (pathname, "/proc/%ld/task", pid); | |
823 | ||
824 | dir = opendir (pathname); | |
825 | ||
826 | if (!dir) | |
827 | { | |
828 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
829 | fflush (stderr); | |
830 | } | |
831 | else | |
832 | { | |
833 | /* At this point we attached to the tgid. Scan the task for | |
834 | existing threads. */ | |
835 | unsigned long lwp; | |
836 | int new_threads_found; | |
837 | int iterations = 0; | |
838 | struct dirent *dp; | |
839 | ||
840 | while (iterations < 2) | |
841 | { | |
842 | new_threads_found = 0; | |
843 | /* Add all the other threads. While we go through the | |
844 | threads, new threads may be spawned. Cycle through | |
845 | the list of threads until we have done two iterations without | |
846 | finding new threads. */ | |
847 | while ((dp = readdir (dir)) != NULL) | |
848 | { | |
849 | /* Fetch one lwp. */ | |
850 | lwp = strtoul (dp->d_name, NULL, 10); | |
851 | ||
852 | /* Is this a new thread? */ | |
853 | if (lwp | |
854 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
855 | { | |
856 | linux_attach_lwp_1 (lwp, 0); | |
857 | new_threads_found++; | |
858 | ||
859 | if (debug_threads) | |
860 | fprintf (stderr, "\ | |
861 | Found and attached to new lwp %ld\n", lwp); | |
862 | } | |
863 | } | |
864 | ||
865 | if (!new_threads_found) | |
866 | iterations++; | |
867 | else | |
868 | iterations = 0; | |
869 | ||
870 | rewinddir (dir); | |
871 | } | |
872 | closedir (dir); | |
873 | } | |
874 | } | |
875 | ||
95954743 PA |
876 | return 0; |
877 | } | |
878 | ||
879 | struct counter | |
880 | { | |
881 | int pid; | |
882 | int count; | |
883 | }; | |
884 | ||
885 | static int | |
886 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
887 | { | |
888 | struct counter *counter = args; | |
889 | ||
890 | if (ptid_get_pid (entry->id) == counter->pid) | |
891 | { | |
892 | if (++counter->count > 1) | |
893 | return 1; | |
894 | } | |
d61ddec4 | 895 | |
da6d8c04 DJ |
896 | return 0; |
897 | } | |
898 | ||
95954743 PA |
899 | static int |
900 | last_thread_of_process_p (struct thread_info *thread) | |
901 | { | |
902 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
903 | int pid = ptid_get_pid (ptid); | |
904 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 905 | |
95954743 PA |
906 | return (find_inferior (&all_threads, |
907 | second_thread_of_pid_p, &counter) == NULL); | |
908 | } | |
909 | ||
da84f473 PA |
910 | /* Kill LWP. */ |
911 | ||
912 | static void | |
913 | linux_kill_one_lwp (struct lwp_info *lwp) | |
914 | { | |
915 | int pid = lwpid_of (lwp); | |
916 | ||
917 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
918 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
919 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
920 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
921 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
922 | per process, not one for each thread. But since we still support | |
923 | linuxthreads, and we also support debugging programs using raw | |
924 | clone without CLONE_THREAD, we send one for each thread. For | |
925 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
926 | about some old kernels where PTRACE_KILL might work better | |
927 | (dubious if there are any such, but that's why it's paranoia), so | |
928 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
929 | everywhere. */ | |
930 | ||
931 | errno = 0; | |
932 | kill (pid, SIGKILL); | |
933 | if (debug_threads) | |
934 | fprintf (stderr, | |
935 | "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
936 | target_pid_to_str (ptid_of (lwp)), | |
937 | errno ? strerror (errno) : "OK"); | |
938 | ||
939 | errno = 0; | |
940 | ptrace (PTRACE_KILL, pid, 0, 0); | |
941 | if (debug_threads) | |
942 | fprintf (stderr, | |
943 | "LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
944 | target_pid_to_str (ptid_of (lwp)), | |
945 | errno ? strerror (errno) : "OK"); | |
946 | } | |
947 | ||
948 | /* Callback for `find_inferior'. Kills an lwp of a given process, | |
949 | except the leader. */ | |
95954743 PA |
950 | |
951 | static int | |
da84f473 | 952 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 953 | { |
0d62e5e8 | 954 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 955 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 956 | int wstat; |
95954743 PA |
957 | int pid = * (int *) args; |
958 | ||
959 | if (ptid_get_pid (entry->id) != pid) | |
960 | return 0; | |
0d62e5e8 | 961 | |
fd500816 DJ |
962 | /* We avoid killing the first thread here, because of a Linux kernel (at |
963 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
964 | the children get a chance to be reaped, it will remain a zombie | |
965 | forever. */ | |
95954743 | 966 | |
12b42a12 | 967 | if (lwpid_of (lwp) == pid) |
95954743 PA |
968 | { |
969 | if (debug_threads) | |
970 | fprintf (stderr, "lkop: is last of process %s\n", | |
971 | target_pid_to_str (entry->id)); | |
972 | return 0; | |
973 | } | |
fd500816 | 974 | |
0d62e5e8 DJ |
975 | do |
976 | { | |
da84f473 | 977 | linux_kill_one_lwp (lwp); |
0d62e5e8 DJ |
978 | |
979 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 980 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 981 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
982 | |
983 | return 0; | |
da6d8c04 DJ |
984 | } |
985 | ||
95954743 PA |
986 | static int |
987 | linux_kill (int pid) | |
0d62e5e8 | 988 | { |
95954743 | 989 | struct process_info *process; |
54a0b537 | 990 | struct lwp_info *lwp; |
fd500816 | 991 | int wstat; |
95954743 | 992 | int lwpid; |
fd500816 | 993 | |
95954743 PA |
994 | process = find_process_pid (pid); |
995 | if (process == NULL) | |
996 | return -1; | |
9d606399 | 997 | |
f9e39928 PA |
998 | /* If we're killing a running inferior, make sure it is stopped |
999 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1000 | stop_all_lwps (0, NULL); |
f9e39928 | 1001 | |
da84f473 | 1002 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1003 | |
54a0b537 | 1004 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1005 | thread in the list, so do so now. */ |
95954743 | 1006 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1007 | |
784867a5 | 1008 | if (lwp == NULL) |
fd500816 | 1009 | { |
784867a5 JK |
1010 | if (debug_threads) |
1011 | fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n", | |
1012 | lwpid_of (lwp), pid); | |
1013 | } | |
1014 | else | |
1015 | { | |
1016 | if (debug_threads) | |
1017 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", | |
1018 | lwpid_of (lwp), pid); | |
fd500816 | 1019 | |
784867a5 JK |
1020 | do |
1021 | { | |
da84f473 | 1022 | linux_kill_one_lwp (lwp); |
784867a5 JK |
1023 | |
1024 | /* Make sure it died. The loop is most likely unnecessary. */ | |
1025 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); | |
1026 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
1027 | } | |
2d717e4f | 1028 | |
8336d594 | 1029 | the_target->mourn (process); |
f9e39928 PA |
1030 | |
1031 | /* Since we presently can only stop all lwps of all processes, we | |
1032 | need to unstop lwps of other processes. */ | |
7984d532 | 1033 | unstop_all_lwps (0, NULL); |
95954743 | 1034 | return 0; |
0d62e5e8 DJ |
1035 | } |
1036 | ||
9b224c5e PA |
1037 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1038 | signal the thread last stopped for, which we need to deliver to the | |
1039 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1040 | ||
1041 | static int | |
1042 | get_detach_signal (struct thread_info *thread) | |
1043 | { | |
1044 | enum target_signal signo = TARGET_SIGNAL_0; | |
1045 | int status; | |
1046 | struct lwp_info *lp = get_thread_lwp (thread); | |
1047 | ||
1048 | if (lp->status_pending_p) | |
1049 | status = lp->status_pending; | |
1050 | else | |
1051 | { | |
1052 | /* If the thread had been suspended by gdbserver, and it stopped | |
1053 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1054 | want to deliver that SIGSTOP. */ | |
1055 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
1056 | || thread->last_status.value.sig == TARGET_SIGNAL_0) | |
1057 | return 0; | |
1058 | ||
1059 | /* Otherwise, we may need to deliver the signal we | |
1060 | intercepted. */ | |
1061 | status = lp->last_status; | |
1062 | } | |
1063 | ||
1064 | if (!WIFSTOPPED (status)) | |
1065 | { | |
1066 | if (debug_threads) | |
1067 | fprintf (stderr, | |
1068 | "GPS: lwp %s hasn't stopped: no pending signal\n", | |
1069 | target_pid_to_str (ptid_of (lp))); | |
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
1074 | if (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1075 | { | |
1076 | if (debug_threads) | |
1077 | fprintf (stderr, | |
1078 | "GPS: lwp %s had stopped with extended " | |
1079 | "status: no pending signal\n", | |
1080 | target_pid_to_str (ptid_of (lp))); | |
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | signo = target_signal_from_host (WSTOPSIG (status)); | |
1085 | ||
1086 | if (program_signals_p && !program_signals[signo]) | |
1087 | { | |
1088 | if (debug_threads) | |
1089 | fprintf (stderr, | |
1090 | "GPS: lwp %s had signal %s, but it is in nopass state\n", | |
1091 | target_pid_to_str (ptid_of (lp)), | |
1092 | target_signal_to_string (signo)); | |
1093 | return 0; | |
1094 | } | |
1095 | else if (!program_signals_p | |
1096 | /* If we have no way to know which signals GDB does not | |
1097 | want to have passed to the program, assume | |
1098 | SIGTRAP/SIGINT, which is GDB's default. */ | |
1099 | && (signo == TARGET_SIGNAL_TRAP || signo == TARGET_SIGNAL_INT)) | |
1100 | { | |
1101 | if (debug_threads) | |
1102 | fprintf (stderr, | |
1103 | "GPS: lwp %s had signal %s, " | |
1104 | "but we don't know if we should pass it. Default to not.\n", | |
1105 | target_pid_to_str (ptid_of (lp)), | |
1106 | target_signal_to_string (signo)); | |
1107 | return 0; | |
1108 | } | |
1109 | else | |
1110 | { | |
1111 | if (debug_threads) | |
1112 | fprintf (stderr, | |
1113 | "GPS: lwp %s has pending signal %s: delivering it.\n", | |
1114 | target_pid_to_str (ptid_of (lp)), | |
1115 | target_signal_to_string (signo)); | |
1116 | ||
1117 | return WSTOPSIG (status); | |
1118 | } | |
1119 | } | |
1120 | ||
95954743 PA |
1121 | static int |
1122 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1123 | { |
1124 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1125 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1126 | int pid = * (int *) args; |
9b224c5e | 1127 | int sig; |
95954743 PA |
1128 | |
1129 | if (ptid_get_pid (entry->id) != pid) | |
1130 | return 0; | |
6ad8ae5c | 1131 | |
9b224c5e | 1132 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1133 | if (lwp->stop_expected) |
ae13219e | 1134 | { |
9b224c5e PA |
1135 | if (debug_threads) |
1136 | fprintf (stderr, | |
1137 | "Sending SIGCONT to %s\n", | |
1138 | target_pid_to_str (ptid_of (lwp))); | |
1139 | ||
1140 | kill_lwp (lwpid_of (lwp), SIGCONT); | |
54a0b537 | 1141 | lwp->stop_expected = 0; |
ae13219e DJ |
1142 | } |
1143 | ||
1144 | /* Flush any pending changes to the process's registers. */ | |
1145 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 1146 | get_lwp_thread (lwp)); |
ae13219e | 1147 | |
9b224c5e PA |
1148 | /* Pass on any pending signal for this thread. */ |
1149 | sig = get_detach_signal (thread); | |
1150 | ||
ae13219e | 1151 | /* Finally, let it resume. */ |
82bfbe7e PA |
1152 | if (the_low_target.prepare_to_resume != NULL) |
1153 | the_low_target.prepare_to_resume (lwp); | |
9b224c5e PA |
1154 | if (ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, sig) < 0) |
1155 | error (_("Can't detach %s: %s"), | |
1156 | target_pid_to_str (ptid_of (lwp)), | |
1157 | strerror (errno)); | |
bd99dc85 PA |
1158 | |
1159 | delete_lwp (lwp); | |
95954743 | 1160 | return 0; |
6ad8ae5c DJ |
1161 | } |
1162 | ||
95954743 PA |
1163 | static int |
1164 | linux_detach (int pid) | |
1165 | { | |
1166 | struct process_info *process; | |
1167 | ||
1168 | process = find_process_pid (pid); | |
1169 | if (process == NULL) | |
1170 | return -1; | |
1171 | ||
f9e39928 PA |
1172 | /* Stop all threads before detaching. First, ptrace requires that |
1173 | the thread is stopped to sucessfully detach. Second, thread_db | |
1174 | may need to uninstall thread event breakpoints from memory, which | |
1175 | only works with a stopped process anyway. */ | |
7984d532 | 1176 | stop_all_lwps (0, NULL); |
f9e39928 | 1177 | |
ca5c370d | 1178 | #ifdef USE_THREAD_DB |
8336d594 | 1179 | thread_db_detach (process); |
ca5c370d PA |
1180 | #endif |
1181 | ||
fa593d66 PA |
1182 | /* Stabilize threads (move out of jump pads). */ |
1183 | stabilize_threads (); | |
1184 | ||
95954743 | 1185 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1186 | |
1187 | the_target->mourn (process); | |
f9e39928 PA |
1188 | |
1189 | /* Since we presently can only stop all lwps of all processes, we | |
1190 | need to unstop lwps of other processes. */ | |
7984d532 | 1191 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1192 | return 0; |
1193 | } | |
1194 | ||
1195 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1196 | ||
1197 | static int | |
1198 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1199 | { | |
1200 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1201 | struct process_info *process = proc; | |
1202 | ||
1203 | if (pid_of (lwp) == pid_of (process)) | |
1204 | delete_lwp (lwp); | |
1205 | ||
dd6953e1 | 1206 | return 0; |
6ad8ae5c DJ |
1207 | } |
1208 | ||
8336d594 PA |
1209 | static void |
1210 | linux_mourn (struct process_info *process) | |
1211 | { | |
1212 | struct process_info_private *priv; | |
1213 | ||
1214 | #ifdef USE_THREAD_DB | |
1215 | thread_db_mourn (process); | |
1216 | #endif | |
1217 | ||
f9e39928 PA |
1218 | find_inferior (&all_lwps, delete_lwp_callback, process); |
1219 | ||
8336d594 PA |
1220 | /* Freeing all private data. */ |
1221 | priv = process->private; | |
1222 | free (priv->arch_private); | |
1223 | free (priv); | |
1224 | process->private = NULL; | |
505106cd PA |
1225 | |
1226 | remove_process (process); | |
8336d594 PA |
1227 | } |
1228 | ||
444d6139 | 1229 | static void |
95954743 | 1230 | linux_join (int pid) |
444d6139 | 1231 | { |
444d6139 PA |
1232 | int status, ret; |
1233 | ||
1234 | do { | |
95954743 | 1235 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1236 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1237 | break; | |
1238 | } while (ret != -1 || errno != ECHILD); | |
1239 | } | |
1240 | ||
6ad8ae5c | 1241 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1242 | static int |
95954743 | 1243 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1244 | { |
95954743 PA |
1245 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1246 | ||
1247 | /* We assume we always know if a thread exits. If a whole process | |
1248 | exited but we still haven't been able to report it to GDB, we'll | |
1249 | hold on to the last lwp of the dead process. */ | |
1250 | if (lwp != NULL) | |
1251 | return !lwp->dead; | |
0d62e5e8 DJ |
1252 | else |
1253 | return 0; | |
1254 | } | |
1255 | ||
6bf5e0ba | 1256 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1257 | static int |
d50171e4 | 1258 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1259 | { |
54a0b537 | 1260 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1261 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1262 | struct thread_info *thread; |
95954743 PA |
1263 | |
1264 | /* Check if we're only interested in events from a specific process | |
1265 | or its lwps. */ | |
1266 | if (!ptid_equal (minus_one_ptid, ptid) | |
1267 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
1268 | return 0; | |
0d62e5e8 | 1269 | |
d50171e4 PA |
1270 | thread = get_lwp_thread (lwp); |
1271 | ||
1272 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1273 | report any status pending the LWP may have. */ | |
8336d594 | 1274 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1275 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1276 | return 0; |
0d62e5e8 | 1277 | |
d50171e4 | 1278 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1279 | } |
1280 | ||
95954743 PA |
1281 | static int |
1282 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1283 | { | |
1284 | ptid_t ptid = *(ptid_t *) data; | |
1285 | int lwp; | |
1286 | ||
1287 | if (ptid_get_lwp (ptid) != 0) | |
1288 | lwp = ptid_get_lwp (ptid); | |
1289 | else | |
1290 | lwp = ptid_get_pid (ptid); | |
1291 | ||
1292 | if (ptid_get_lwp (entry->id) == lwp) | |
1293 | return 1; | |
1294 | ||
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | struct lwp_info * | |
1299 | find_lwp_pid (ptid_t ptid) | |
1300 | { | |
1301 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1302 | } | |
1303 | ||
bd99dc85 | 1304 | static struct lwp_info * |
95954743 | 1305 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1306 | { |
0d62e5e8 | 1307 | int ret; |
95954743 | 1308 | int to_wait_for = -1; |
bd99dc85 | 1309 | struct lwp_info *child = NULL; |
0d62e5e8 | 1310 | |
bd99dc85 | 1311 | if (debug_threads) |
95954743 PA |
1312 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1313 | ||
1314 | if (ptid_equal (ptid, minus_one_ptid)) | |
1315 | to_wait_for = -1; /* any child */ | |
1316 | else | |
1317 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1318 | |
bd99dc85 | 1319 | options |= __WALL; |
0d62e5e8 | 1320 | |
bd99dc85 | 1321 | retry: |
0d62e5e8 | 1322 | |
bd99dc85 PA |
1323 | ret = my_waitpid (to_wait_for, wstatp, options); |
1324 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1325 | return NULL; | |
1326 | else if (ret == -1) | |
1327 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1328 | |
1329 | if (debug_threads | |
1330 | && (!WIFSTOPPED (*wstatp) | |
1331 | || (WSTOPSIG (*wstatp) != 32 | |
1332 | && WSTOPSIG (*wstatp) != 33))) | |
1333 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1334 | ||
95954743 | 1335 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1336 | |
24a09b5f DJ |
1337 | /* If we didn't find a process, one of two things presumably happened: |
1338 | - A process we started and then detached from has exited. Ignore it. | |
1339 | - A process we are controlling has forked and the new child's stop | |
1340 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1341 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f | 1342 | { |
05044653 | 1343 | add_to_pid_list (&stopped_pids, ret, *wstatp); |
24a09b5f DJ |
1344 | goto retry; |
1345 | } | |
bd99dc85 | 1346 | else if (child == NULL) |
24a09b5f DJ |
1347 | goto retry; |
1348 | ||
bd99dc85 | 1349 | child->stopped = 1; |
0d62e5e8 | 1350 | |
bd99dc85 | 1351 | child->last_status = *wstatp; |
32ca6d61 | 1352 | |
d61ddec4 UW |
1353 | /* Architecture-specific setup after inferior is running. |
1354 | This needs to happen after we have attached to the inferior | |
1355 | and it is stopped for the first time, but before we access | |
1356 | any inferior registers. */ | |
1357 | if (new_inferior) | |
1358 | { | |
1359 | the_low_target.arch_setup (); | |
52fa2412 UW |
1360 | #ifdef HAVE_LINUX_REGSETS |
1361 | memset (disabled_regsets, 0, num_regsets); | |
1362 | #endif | |
d61ddec4 UW |
1363 | new_inferior = 0; |
1364 | } | |
1365 | ||
c3adc08c PA |
1366 | /* Fetch the possibly triggered data watchpoint info and store it in |
1367 | CHILD. | |
1368 | ||
1369 | On some archs, like x86, that use debug registers to set | |
1370 | watchpoints, it's possible that the way to know which watched | |
1371 | address trapped, is to check the register that is used to select | |
1372 | which address to watch. Problem is, between setting the | |
1373 | watchpoint and reading back which data address trapped, the user | |
1374 | may change the set of watchpoints, and, as a consequence, GDB | |
1375 | changes the debug registers in the inferior. To avoid reading | |
1376 | back a stale stopped-data-address when that happens, we cache in | |
1377 | LP the fact that a watchpoint trapped, and the corresponding data | |
1378 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1379 | changes the debug registers meanwhile, we have the cached data we | |
1380 | can rely on. */ | |
1381 | ||
1382 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1383 | { | |
1384 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1385 | { | |
1386 | child->stopped_by_watchpoint = 0; | |
1387 | } | |
1388 | else | |
1389 | { | |
1390 | struct thread_info *saved_inferior; | |
1391 | ||
1392 | saved_inferior = current_inferior; | |
1393 | current_inferior = get_lwp_thread (child); | |
1394 | ||
1395 | child->stopped_by_watchpoint | |
1396 | = the_low_target.stopped_by_watchpoint (); | |
1397 | ||
1398 | if (child->stopped_by_watchpoint) | |
1399 | { | |
1400 | if (the_low_target.stopped_data_address != NULL) | |
1401 | child->stopped_data_address | |
1402 | = the_low_target.stopped_data_address (); | |
1403 | else | |
1404 | child->stopped_data_address = 0; | |
1405 | } | |
1406 | ||
1407 | current_inferior = saved_inferior; | |
1408 | } | |
1409 | } | |
1410 | ||
d50171e4 PA |
1411 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1412 | architecture being defined already (so that CHILD has a valid | |
1413 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1414 | not). */ | |
1415 | if (WIFSTOPPED (*wstatp)) | |
1416 | child->stop_pc = get_stop_pc (child); | |
1417 | ||
0d62e5e8 | 1418 | if (debug_threads |
47c0c975 DE |
1419 | && WIFSTOPPED (*wstatp) |
1420 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1421 | { |
896c7fbb | 1422 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1423 | struct regcache *regcache; |
47c0c975 DE |
1424 | CORE_ADDR pc; |
1425 | ||
d50171e4 | 1426 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1427 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1428 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1429 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1430 | current_inferior = saved_inferior; |
0d62e5e8 | 1431 | } |
bd99dc85 PA |
1432 | |
1433 | return child; | |
0d62e5e8 | 1434 | } |
611cb4a5 | 1435 | |
219f2f23 PA |
1436 | /* This function should only be called if the LWP got a SIGTRAP. |
1437 | ||
1438 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1439 | event was handled, 0 otherwise. */ | |
1440 | ||
1441 | static int | |
1442 | handle_tracepoints (struct lwp_info *lwp) | |
1443 | { | |
1444 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1445 | int tpoint_related_event = 0; | |
1446 | ||
7984d532 PA |
1447 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1448 | uninsert tracepoints. To do this, we temporarily pause all | |
1449 | threads, unpatch away, and then unpause threads. We need to make | |
1450 | sure the unpausing doesn't resume LWP too. */ | |
1451 | lwp->suspended++; | |
1452 | ||
219f2f23 PA |
1453 | /* And we need to be sure that any all-threads-stopping doesn't try |
1454 | to move threads out of the jump pads, as it could deadlock the | |
1455 | inferior (LWP could be in the jump pad, maybe even holding the | |
1456 | lock.) */ | |
1457 | ||
1458 | /* Do any necessary step collect actions. */ | |
1459 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1460 | ||
fa593d66 PA |
1461 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1462 | ||
219f2f23 PA |
1463 | /* See if we just hit a tracepoint and do its main collect |
1464 | actions. */ | |
1465 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1466 | ||
7984d532 PA |
1467 | lwp->suspended--; |
1468 | ||
1469 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1470 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1471 | |
219f2f23 PA |
1472 | if (tpoint_related_event) |
1473 | { | |
1474 | if (debug_threads) | |
1475 | fprintf (stderr, "got a tracepoint event\n"); | |
1476 | return 1; | |
1477 | } | |
1478 | ||
1479 | return 0; | |
1480 | } | |
1481 | ||
fa593d66 PA |
1482 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1483 | fast tracepoint. */ | |
1484 | ||
1485 | static int | |
1486 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1487 | struct fast_tpoint_collect_status *status) | |
1488 | { | |
1489 | CORE_ADDR thread_area; | |
1490 | ||
1491 | if (the_low_target.get_thread_area == NULL) | |
1492 | return 0; | |
1493 | ||
1494 | /* Get the thread area address. This is used to recognize which | |
1495 | thread is which when tracing with the in-process agent library. | |
1496 | We don't read anything from the address, and treat it as opaque; | |
1497 | it's the address itself that we assume is unique per-thread. */ | |
1498 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1499 | return 0; | |
1500 | ||
1501 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1502 | } | |
1503 | ||
1504 | /* The reason we resume in the caller, is because we want to be able | |
1505 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1506 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1507 | refuses to resume. */ | |
1508 | ||
1509 | static int | |
1510 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1511 | { | |
1512 | struct thread_info *saved_inferior; | |
1513 | ||
1514 | saved_inferior = current_inferior; | |
1515 | current_inferior = get_lwp_thread (lwp); | |
1516 | ||
1517 | if ((wstat == NULL | |
1518 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1519 | && supports_fast_tracepoints () | |
58b4daa5 | 1520 | && agent_loaded_p ()) |
fa593d66 PA |
1521 | { |
1522 | struct fast_tpoint_collect_status status; | |
1523 | int r; | |
1524 | ||
1525 | if (debug_threads) | |
1526 | fprintf (stderr, "\ | |
1527 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1528 | lwpid_of (lwp)); | |
1529 | ||
1530 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1531 | ||
1532 | if (wstat == NULL | |
1533 | || (WSTOPSIG (*wstat) != SIGILL | |
1534 | && WSTOPSIG (*wstat) != SIGFPE | |
1535 | && WSTOPSIG (*wstat) != SIGSEGV | |
1536 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1537 | { | |
1538 | lwp->collecting_fast_tracepoint = r; | |
1539 | ||
1540 | if (r != 0) | |
1541 | { | |
1542 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1543 | { | |
1544 | /* Haven't executed the original instruction yet. | |
1545 | Set breakpoint there, and wait till it's hit, | |
1546 | then single-step until exiting the jump pad. */ | |
1547 | lwp->exit_jump_pad_bkpt | |
1548 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1549 | } | |
1550 | ||
1551 | if (debug_threads) | |
1552 | fprintf (stderr, "\ | |
1553 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1554 | lwpid_of (lwp)); | |
0cccb683 | 1555 | current_inferior = saved_inferior; |
fa593d66 PA |
1556 | |
1557 | return 1; | |
1558 | } | |
1559 | } | |
1560 | else | |
1561 | { | |
1562 | /* If we get a synchronous signal while collecting, *and* | |
1563 | while executing the (relocated) original instruction, | |
1564 | reset the PC to point at the tpoint address, before | |
1565 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1566 | report the signal to GDB, and pray for the best. */ | |
1567 | ||
1568 | lwp->collecting_fast_tracepoint = 0; | |
1569 | ||
1570 | if (r != 0 | |
1571 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1572 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1573 | { | |
1574 | siginfo_t info; | |
1575 | struct regcache *regcache; | |
1576 | ||
1577 | /* The si_addr on a few signals references the address | |
1578 | of the faulting instruction. Adjust that as | |
1579 | well. */ | |
1580 | if ((WSTOPSIG (*wstat) == SIGILL | |
1581 | || WSTOPSIG (*wstat) == SIGFPE | |
1582 | || WSTOPSIG (*wstat) == SIGBUS | |
1583 | || WSTOPSIG (*wstat) == SIGSEGV) | |
1584 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &info) == 0 | |
1585 | /* Final check just to make sure we don't clobber | |
1586 | the siginfo of non-kernel-sent signals. */ | |
1587 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1588 | { | |
1589 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
1590 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &info); | |
1591 | } | |
1592 | ||
1593 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1594 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1595 | lwp->stop_pc = status.tpoint_addr; | |
1596 | ||
1597 | /* Cancel any fast tracepoint lock this thread was | |
1598 | holding. */ | |
1599 | force_unlock_trace_buffer (); | |
1600 | } | |
1601 | ||
1602 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1603 | { | |
1604 | if (debug_threads) | |
1605 | fprintf (stderr, | |
1606 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1607 | "stopping all threads momentarily.\n"); | |
1608 | ||
1609 | stop_all_lwps (1, lwp); | |
1610 | cancel_breakpoints (); | |
1611 | ||
1612 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1613 | lwp->exit_jump_pad_bkpt = NULL; | |
1614 | ||
1615 | unstop_all_lwps (1, lwp); | |
1616 | ||
1617 | gdb_assert (lwp->suspended >= 0); | |
1618 | } | |
1619 | } | |
1620 | } | |
1621 | ||
1622 | if (debug_threads) | |
1623 | fprintf (stderr, "\ | |
1624 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1625 | lwpid_of (lwp)); | |
0cccb683 YQ |
1626 | |
1627 | current_inferior = saved_inferior; | |
fa593d66 PA |
1628 | return 0; |
1629 | } | |
1630 | ||
1631 | /* Enqueue one signal in the "signals to report later when out of the | |
1632 | jump pad" list. */ | |
1633 | ||
1634 | static void | |
1635 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1636 | { | |
1637 | struct pending_signals *p_sig; | |
1638 | ||
1639 | if (debug_threads) | |
1640 | fprintf (stderr, "\ | |
1641 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1642 | ||
1643 | if (debug_threads) | |
1644 | { | |
1645 | struct pending_signals *sig; | |
1646 | ||
1647 | for (sig = lwp->pending_signals_to_report; | |
1648 | sig != NULL; | |
1649 | sig = sig->prev) | |
1650 | fprintf (stderr, | |
1651 | " Already queued %d\n", | |
1652 | sig->signal); | |
1653 | ||
1654 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1655 | } | |
1656 | ||
1a981360 PA |
1657 | /* Don't enqueue non-RT signals if they are already in the deferred |
1658 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1659 | twice) */ | |
1660 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1661 | { | |
1662 | struct pending_signals *sig; | |
1663 | ||
1664 | for (sig = lwp->pending_signals_to_report; | |
1665 | sig != NULL; | |
1666 | sig = sig->prev) | |
1667 | { | |
1668 | if (sig->signal == WSTOPSIG (*wstat)) | |
1669 | { | |
1670 | if (debug_threads) | |
1671 | fprintf (stderr, | |
1672 | "Not requeuing already queued non-RT signal %d" | |
1673 | " for LWP %ld\n", | |
1674 | sig->signal, | |
1675 | lwpid_of (lwp)); | |
1676 | return; | |
1677 | } | |
1678 | } | |
1679 | } | |
1680 | ||
fa593d66 PA |
1681 | p_sig = xmalloc (sizeof (*p_sig)); |
1682 | p_sig->prev = lwp->pending_signals_to_report; | |
1683 | p_sig->signal = WSTOPSIG (*wstat); | |
1684 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1685 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1686 | ||
1687 | lwp->pending_signals_to_report = p_sig; | |
1688 | } | |
1689 | ||
1690 | /* Dequeue one signal from the "signals to report later when out of | |
1691 | the jump pad" list. */ | |
1692 | ||
1693 | static int | |
1694 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1695 | { | |
1696 | if (lwp->pending_signals_to_report != NULL) | |
1697 | { | |
1698 | struct pending_signals **p_sig; | |
1699 | ||
1700 | p_sig = &lwp->pending_signals_to_report; | |
1701 | while ((*p_sig)->prev != NULL) | |
1702 | p_sig = &(*p_sig)->prev; | |
1703 | ||
1704 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1705 | if ((*p_sig)->info.si_signo != 0) | |
1706 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); | |
1707 | free (*p_sig); | |
1708 | *p_sig = NULL; | |
1709 | ||
1710 | if (debug_threads) | |
1711 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1712 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1713 | ||
1714 | if (debug_threads) | |
1715 | { | |
1716 | struct pending_signals *sig; | |
1717 | ||
1718 | for (sig = lwp->pending_signals_to_report; | |
1719 | sig != NULL; | |
1720 | sig = sig->prev) | |
1721 | fprintf (stderr, | |
1722 | " Still queued %d\n", | |
1723 | sig->signal); | |
1724 | ||
1725 | fprintf (stderr, " (no more queued signals)\n"); | |
1726 | } | |
1727 | ||
1728 | return 1; | |
1729 | } | |
1730 | ||
1731 | return 0; | |
1732 | } | |
1733 | ||
d50171e4 PA |
1734 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1735 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1736 | will handle the current event, eventually we will resume this LWP, | |
1737 | and this breakpoint will trap again. */ | |
1738 | ||
1739 | static int | |
1740 | cancel_breakpoint (struct lwp_info *lwp) | |
1741 | { | |
1742 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1743 | |
1744 | /* There's nothing to do if we don't support breakpoints. */ | |
1745 | if (!supports_breakpoints ()) | |
1746 | return 0; | |
1747 | ||
d50171e4 PA |
1748 | /* breakpoint_at reads from current inferior. */ |
1749 | saved_inferior = current_inferior; | |
1750 | current_inferior = get_lwp_thread (lwp); | |
1751 | ||
1752 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1753 | { | |
1754 | if (debug_threads) | |
1755 | fprintf (stderr, | |
1756 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1757 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1758 | |
1759 | /* Back up the PC if necessary. */ | |
1760 | if (the_low_target.decr_pc_after_break) | |
1761 | { | |
1762 | struct regcache *regcache | |
fc7238bb | 1763 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1764 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1765 | } | |
1766 | ||
1767 | current_inferior = saved_inferior; | |
1768 | return 1; | |
1769 | } | |
1770 | else | |
1771 | { | |
1772 | if (debug_threads) | |
1773 | fprintf (stderr, | |
1774 | "CB: No breakpoint found at %s for [%s]\n", | |
1775 | paddress (lwp->stop_pc), | |
fc7238bb | 1776 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1777 | } |
1778 | ||
1779 | current_inferior = saved_inferior; | |
1780 | return 0; | |
1781 | } | |
1782 | ||
1783 | /* When the event-loop is doing a step-over, this points at the thread | |
1784 | being stepped. */ | |
1785 | ptid_t step_over_bkpt; | |
1786 | ||
bd99dc85 PA |
1787 | /* Wait for an event from child PID. If PID is -1, wait for any |
1788 | child. Store the stop status through the status pointer WSTAT. | |
1789 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1790 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1791 | the stopped child otherwise. */ | |
1792 | ||
0d62e5e8 | 1793 | static int |
d8301ad1 | 1794 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1795 | { |
d50171e4 | 1796 | struct lwp_info *event_child, *requested_child; |
d8301ad1 | 1797 | ptid_t wait_ptid; |
d50171e4 | 1798 | |
d50171e4 PA |
1799 | event_child = NULL; |
1800 | requested_child = NULL; | |
0d62e5e8 | 1801 | |
95954743 | 1802 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1803 | |
e825046f | 1804 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
0d62e5e8 | 1805 | { |
54a0b537 | 1806 | event_child = (struct lwp_info *) |
d50171e4 | 1807 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1808 | if (debug_threads && event_child) |
bd99dc85 | 1809 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1810 | } |
1811 | else | |
1812 | { | |
95954743 | 1813 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1814 | |
fa593d66 PA |
1815 | if (!stopping_threads |
1816 | && requested_child->status_pending_p | |
1817 | && requested_child->collecting_fast_tracepoint) | |
1818 | { | |
1819 | enqueue_one_deferred_signal (requested_child, | |
1820 | &requested_child->status_pending); | |
1821 | requested_child->status_pending_p = 0; | |
1822 | requested_child->status_pending = 0; | |
1823 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1824 | } | |
1825 | ||
1826 | if (requested_child->suspended | |
1827 | && requested_child->status_pending_p) | |
1828 | fatal ("requesting an event out of a suspended child?"); | |
1829 | ||
d50171e4 | 1830 | if (requested_child->status_pending_p) |
bd99dc85 | 1831 | event_child = requested_child; |
0d62e5e8 | 1832 | } |
611cb4a5 | 1833 | |
0d62e5e8 DJ |
1834 | if (event_child != NULL) |
1835 | { | |
bd99dc85 PA |
1836 | if (debug_threads) |
1837 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1838 | lwpid_of (event_child), event_child->status_pending); | |
1839 | *wstat = event_child->status_pending; | |
1840 | event_child->status_pending_p = 0; | |
1841 | event_child->status_pending = 0; | |
1842 | current_inferior = get_lwp_thread (event_child); | |
1843 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1844 | } |
1845 | ||
d8301ad1 JK |
1846 | if (ptid_is_pid (ptid)) |
1847 | { | |
1848 | /* A request to wait for a specific tgid. This is not possible | |
1849 | with waitpid, so instead, we wait for any child, and leave | |
1850 | children we're not interested in right now with a pending | |
1851 | status to report later. */ | |
1852 | wait_ptid = minus_one_ptid; | |
1853 | } | |
1854 | else | |
1855 | wait_ptid = ptid; | |
1856 | ||
0d62e5e8 DJ |
1857 | /* We only enter this loop if no process has a pending wait status. Thus |
1858 | any action taken in response to a wait status inside this loop is | |
1859 | responding as soon as we detect the status, not after any pending | |
1860 | events. */ | |
1861 | while (1) | |
1862 | { | |
d8301ad1 | 1863 | event_child = linux_wait_for_lwp (wait_ptid, wstat, options); |
0d62e5e8 | 1864 | |
bd99dc85 | 1865 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1866 | { |
1867 | if (debug_threads) | |
1868 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1869 | return 0; | |
1870 | } | |
0d62e5e8 DJ |
1871 | |
1872 | if (event_child == NULL) | |
1873 | error ("event from unknown child"); | |
611cb4a5 | 1874 | |
d8301ad1 JK |
1875 | if (ptid_is_pid (ptid) |
1876 | && ptid_get_pid (ptid) != ptid_get_pid (ptid_of (event_child))) | |
1877 | { | |
1878 | if (! WIFSTOPPED (*wstat)) | |
1879 | mark_lwp_dead (event_child, *wstat); | |
1880 | else | |
1881 | { | |
1882 | event_child->status_pending_p = 1; | |
1883 | event_child->status_pending = *wstat; | |
1884 | } | |
1885 | continue; | |
1886 | } | |
1887 | ||
bd99dc85 | 1888 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1889 | |
89be2091 | 1890 | /* Check for thread exit. */ |
bd99dc85 | 1891 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1892 | { |
89be2091 | 1893 | if (debug_threads) |
95954743 | 1894 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1895 | |
1896 | /* If the last thread is exiting, just return. */ | |
95954743 | 1897 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1898 | { |
1899 | if (debug_threads) | |
95954743 PA |
1900 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1901 | lwpid_of (event_child)); | |
bd99dc85 PA |
1902 | return lwpid_of (event_child); |
1903 | } | |
89be2091 | 1904 | |
bd99dc85 PA |
1905 | if (!non_stop) |
1906 | { | |
1907 | current_inferior = (struct thread_info *) all_threads.head; | |
1908 | if (debug_threads) | |
1909 | fprintf (stderr, "Current inferior is now %ld\n", | |
1910 | lwpid_of (get_thread_lwp (current_inferior))); | |
1911 | } | |
1912 | else | |
1913 | { | |
1914 | current_inferior = NULL; | |
1915 | if (debug_threads) | |
1916 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1917 | } | |
89be2091 DJ |
1918 | |
1919 | /* If we were waiting for this particular child to do something... | |
1920 | well, it did something. */ | |
bd99dc85 | 1921 | if (requested_child != NULL) |
d50171e4 PA |
1922 | { |
1923 | int lwpid = lwpid_of (event_child); | |
1924 | ||
1925 | /* Cancel the step-over operation --- the thread that | |
1926 | started it is gone. */ | |
1927 | if (finish_step_over (event_child)) | |
7984d532 | 1928 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1929 | delete_lwp (event_child); |
1930 | return lwpid; | |
1931 | } | |
1932 | ||
1933 | delete_lwp (event_child); | |
89be2091 DJ |
1934 | |
1935 | /* Wait for a more interesting event. */ | |
1936 | continue; | |
1937 | } | |
1938 | ||
a6dbe5df PA |
1939 | if (event_child->must_set_ptrace_flags) |
1940 | { | |
1e7fc18c | 1941 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1942 | event_child->must_set_ptrace_flags = 0; |
1943 | } | |
1944 | ||
bd99dc85 PA |
1945 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1946 | && *wstat >> 16 != 0) | |
24a09b5f | 1947 | { |
bd99dc85 | 1948 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1949 | continue; |
1950 | } | |
1951 | ||
d50171e4 PA |
1952 | if (WIFSTOPPED (*wstat) |
1953 | && WSTOPSIG (*wstat) == SIGSTOP | |
1954 | && event_child->stop_expected) | |
1955 | { | |
1956 | int should_stop; | |
1957 | ||
1958 | if (debug_threads) | |
1959 | fprintf (stderr, "Expected stop.\n"); | |
1960 | event_child->stop_expected = 0; | |
1961 | ||
8336d594 | 1962 | should_stop = (current_inferior->last_resume_kind == resume_stop |
d50171e4 PA |
1963 | || stopping_threads); |
1964 | ||
1965 | if (!should_stop) | |
1966 | { | |
1967 | linux_resume_one_lwp (event_child, | |
1968 | event_child->stepping, 0, NULL); | |
1969 | continue; | |
1970 | } | |
1971 | } | |
1972 | ||
bd99dc85 | 1973 | return lwpid_of (event_child); |
611cb4a5 | 1974 | } |
0d62e5e8 | 1975 | |
611cb4a5 DJ |
1976 | /* NOTREACHED */ |
1977 | return 0; | |
1978 | } | |
1979 | ||
6bf5e0ba PA |
1980 | /* Count the LWP's that have had events. */ |
1981 | ||
1982 | static int | |
1983 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1984 | { | |
1985 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1986 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1987 | int *count = data; |
1988 | ||
1989 | gdb_assert (count != NULL); | |
1990 | ||
1991 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1992 | should be reported to GDB. */ | |
8336d594 PA |
1993 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1994 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
1995 | && lp->status_pending_p |
1996 | && WIFSTOPPED (lp->status_pending) | |
1997 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1998 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1999 | (*count)++; | |
2000 | ||
2001 | return 0; | |
2002 | } | |
2003 | ||
2004 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2005 | ||
2006 | static int | |
2007 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2008 | { | |
2009 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2010 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 2011 | |
8336d594 PA |
2012 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2013 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2014 | && lp->status_pending_p) |
2015 | return 1; | |
2016 | else | |
2017 | return 0; | |
2018 | } | |
2019 | ||
2020 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2021 | reported to GDB. */ | |
2022 | ||
2023 | static int | |
2024 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2025 | { | |
2026 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2027 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2028 | int *selector = data; |
2029 | ||
2030 | gdb_assert (selector != NULL); | |
2031 | ||
2032 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
2033 | if (thread->last_resume_kind != resume_stop |
2034 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2035 | && lp->status_pending_p |
2036 | && WIFSTOPPED (lp->status_pending) | |
2037 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2038 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2039 | if ((*selector)-- == 0) | |
2040 | return 1; | |
2041 | ||
2042 | return 0; | |
2043 | } | |
2044 | ||
2045 | static int | |
2046 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
2047 | { | |
2048 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2049 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2050 | struct lwp_info *event_lp = data; |
2051 | ||
2052 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2053 | if (lp == event_lp) | |
2054 | return 0; | |
2055 | ||
2056 | /* If a LWP other than the LWP that we're reporting an event for has | |
2057 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2058 | then just arrange for it to hit it again later. We don't keep | |
2059 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2060 | LWP. We will handle the current event, eventually we will resume | |
2061 | all LWPs, and this one will get its breakpoint trap again. | |
2062 | ||
2063 | If we do not do this, then we run the risk that the user will | |
2064 | delete or disable the breakpoint, but the LWP will have already | |
2065 | tripped on it. */ | |
2066 | ||
8336d594 PA |
2067 | if (thread->last_resume_kind != resume_stop |
2068 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2069 | && lp->status_pending_p |
2070 | && WIFSTOPPED (lp->status_pending) | |
2071 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
2072 | && !lp->stepping |
2073 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
2074 | && cancel_breakpoint (lp)) |
2075 | /* Throw away the SIGTRAP. */ | |
2076 | lp->status_pending_p = 0; | |
2077 | ||
2078 | return 0; | |
2079 | } | |
2080 | ||
7984d532 PA |
2081 | static void |
2082 | linux_cancel_breakpoints (void) | |
2083 | { | |
2084 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
2085 | } | |
2086 | ||
6bf5e0ba PA |
2087 | /* Select one LWP out of those that have events pending. */ |
2088 | ||
2089 | static void | |
2090 | select_event_lwp (struct lwp_info **orig_lp) | |
2091 | { | |
2092 | int num_events = 0; | |
2093 | int random_selector; | |
2094 | struct lwp_info *event_lp; | |
2095 | ||
2096 | /* Give preference to any LWP that is being single-stepped. */ | |
2097 | event_lp | |
2098 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2099 | select_singlestep_lwp_callback, NULL); | |
2100 | if (event_lp != NULL) | |
2101 | { | |
2102 | if (debug_threads) | |
2103 | fprintf (stderr, | |
2104 | "SEL: Select single-step %s\n", | |
2105 | target_pid_to_str (ptid_of (event_lp))); | |
2106 | } | |
2107 | else | |
2108 | { | |
2109 | /* No single-stepping LWP. Select one at random, out of those | |
2110 | which have had SIGTRAP events. */ | |
2111 | ||
2112 | /* First see how many SIGTRAP events we have. */ | |
2113 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
2114 | ||
2115 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2116 | random_selector = (int) | |
2117 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2118 | ||
2119 | if (debug_threads && num_events > 1) | |
2120 | fprintf (stderr, | |
2121 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2122 | num_events, random_selector); | |
2123 | ||
2124 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
2125 | select_event_lwp_callback, | |
2126 | &random_selector); | |
2127 | } | |
2128 | ||
2129 | if (event_lp != NULL) | |
2130 | { | |
2131 | /* Switch the event LWP. */ | |
2132 | *orig_lp = event_lp; | |
2133 | } | |
2134 | } | |
2135 | ||
7984d532 PA |
2136 | /* Decrement the suspend count of an LWP. */ |
2137 | ||
2138 | static int | |
2139 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2140 | { | |
2141 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2142 | ||
2143 | /* Ignore EXCEPT. */ | |
2144 | if (lwp == except) | |
2145 | return 0; | |
2146 | ||
2147 | lwp->suspended--; | |
2148 | ||
2149 | gdb_assert (lwp->suspended >= 0); | |
2150 | return 0; | |
2151 | } | |
2152 | ||
2153 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2154 | NULL. */ | |
2155 | ||
2156 | static void | |
2157 | unsuspend_all_lwps (struct lwp_info *except) | |
2158 | { | |
2159 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
2160 | } | |
2161 | ||
fa593d66 PA |
2162 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2163 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2164 | void *data); | |
2165 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2166 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2167 | struct target_waitstatus *ourstatus, | |
2168 | int target_options); | |
2169 | ||
2170 | /* Stabilize threads (move out of jump pads). | |
2171 | ||
2172 | If a thread is midway collecting a fast tracepoint, we need to | |
2173 | finish the collection and move it out of the jump pad before | |
2174 | reporting the signal. | |
2175 | ||
2176 | This avoids recursion while collecting (when a signal arrives | |
2177 | midway, and the signal handler itself collects), which would trash | |
2178 | the trace buffer. In case the user set a breakpoint in a signal | |
2179 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2180 | Most importantly, there are certain things we can't do safely if | |
2181 | threads are stopped in a jump pad (or in its callee's). For | |
2182 | example: | |
2183 | ||
2184 | - starting a new trace run. A thread still collecting the | |
2185 | previous run, could trash the trace buffer when resumed. The trace | |
2186 | buffer control structures would have been reset but the thread had | |
2187 | no way to tell. The thread could even midway memcpy'ing to the | |
2188 | buffer, which would mean that when resumed, it would clobber the | |
2189 | trace buffer that had been set for a new run. | |
2190 | ||
2191 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2192 | safely. Say you do tstart while a thread is stopped midway while | |
2193 | collecting. When the thread is later resumed, it finishes the | |
2194 | collection, and returns to the jump pad, to execute the original | |
2195 | instruction that was under the tracepoint jump at the time the | |
2196 | older run had been started. If the jump pad had been rewritten | |
2197 | since for something else in the new run, the thread would now | |
2198 | execute the wrong / random instructions. */ | |
2199 | ||
2200 | static void | |
2201 | linux_stabilize_threads (void) | |
2202 | { | |
2203 | struct thread_info *save_inferior; | |
2204 | struct lwp_info *lwp_stuck; | |
2205 | ||
2206 | lwp_stuck | |
2207 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2208 | stuck_in_jump_pad_callback, NULL); | |
2209 | if (lwp_stuck != NULL) | |
2210 | { | |
b4d51a55 PA |
2211 | if (debug_threads) |
2212 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
2213 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2214 | return; |
2215 | } | |
2216 | ||
2217 | save_inferior = current_inferior; | |
2218 | ||
2219 | stabilizing_threads = 1; | |
2220 | ||
2221 | /* Kick 'em all. */ | |
2222 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2223 | ||
2224 | /* Loop until all are stopped out of the jump pads. */ | |
2225 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2226 | { | |
2227 | struct target_waitstatus ourstatus; | |
2228 | struct lwp_info *lwp; | |
fa593d66 PA |
2229 | int wstat; |
2230 | ||
2231 | /* Note that we go through the full wait even loop. While | |
2232 | moving threads out of jump pad, we need to be able to step | |
2233 | over internal breakpoints and such. */ | |
32fcada3 | 2234 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2235 | |
2236 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2237 | { | |
2238 | lwp = get_thread_lwp (current_inferior); | |
2239 | ||
2240 | /* Lock it. */ | |
2241 | lwp->suspended++; | |
2242 | ||
2243 | if (ourstatus.value.sig != TARGET_SIGNAL_0 | |
2244 | || current_inferior->last_resume_kind == resume_stop) | |
2245 | { | |
2246 | wstat = W_STOPCODE (target_signal_to_host (ourstatus.value.sig)); | |
2247 | enqueue_one_deferred_signal (lwp, &wstat); | |
2248 | } | |
2249 | } | |
2250 | } | |
2251 | ||
2252 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2253 | ||
2254 | stabilizing_threads = 0; | |
2255 | ||
2256 | current_inferior = save_inferior; | |
2257 | ||
b4d51a55 | 2258 | if (debug_threads) |
fa593d66 | 2259 | { |
b4d51a55 PA |
2260 | lwp_stuck |
2261 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2262 | stuck_in_jump_pad_callback, NULL); | |
2263 | if (lwp_stuck != NULL) | |
fa593d66 PA |
2264 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2265 | lwpid_of (lwp_stuck)); | |
2266 | } | |
2267 | } | |
2268 | ||
0d62e5e8 | 2269 | /* Wait for process, returns status. */ |
da6d8c04 | 2270 | |
95954743 PA |
2271 | static ptid_t |
2272 | linux_wait_1 (ptid_t ptid, | |
2273 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2274 | { |
e5f1222d | 2275 | int w; |
fc7238bb | 2276 | struct lwp_info *event_child; |
bd99dc85 | 2277 | int options; |
bd99dc85 | 2278 | int pid; |
6bf5e0ba PA |
2279 | int step_over_finished; |
2280 | int bp_explains_trap; | |
2281 | int maybe_internal_trap; | |
2282 | int report_to_gdb; | |
219f2f23 | 2283 | int trace_event; |
bd99dc85 PA |
2284 | |
2285 | /* Translate generic target options into linux options. */ | |
2286 | options = __WALL; | |
2287 | if (target_options & TARGET_WNOHANG) | |
2288 | options |= WNOHANG; | |
0d62e5e8 DJ |
2289 | |
2290 | retry: | |
fa593d66 PA |
2291 | bp_explains_trap = 0; |
2292 | trace_event = 0; | |
bd99dc85 PA |
2293 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2294 | ||
0d62e5e8 DJ |
2295 | /* If we were only supposed to resume one thread, only wait for |
2296 | that thread - if it's still alive. If it died, however - which | |
2297 | can happen if we're coming from the thread death case below - | |
2298 | then we need to make sure we restart the other threads. We could | |
2299 | pick a thread at random or restart all; restarting all is less | |
2300 | arbitrary. */ | |
95954743 PA |
2301 | if (!non_stop |
2302 | && !ptid_equal (cont_thread, null_ptid) | |
2303 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2304 | { |
fc7238bb PA |
2305 | struct thread_info *thread; |
2306 | ||
bd99dc85 PA |
2307 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2308 | cont_thread); | |
0d62e5e8 DJ |
2309 | |
2310 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2311 | if (thread == NULL) |
64386c31 DJ |
2312 | { |
2313 | struct thread_resume resume_info; | |
95954743 | 2314 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2315 | resume_info.kind = resume_continue; |
2316 | resume_info.sig = 0; | |
2bd7c093 | 2317 | linux_resume (&resume_info, 1); |
64386c31 | 2318 | } |
bd99dc85 | 2319 | else |
95954743 | 2320 | ptid = cont_thread; |
0d62e5e8 | 2321 | } |
da6d8c04 | 2322 | |
6bf5e0ba PA |
2323 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2324 | pid = linux_wait_for_event (ptid, &w, options); | |
2325 | else | |
2326 | { | |
2327 | if (debug_threads) | |
2328 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2329 | target_pid_to_str (step_over_bkpt)); | |
2330 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2331 | } | |
2332 | ||
bd99dc85 | 2333 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2334 | return null_ptid; |
bd99dc85 | 2335 | |
6bf5e0ba | 2336 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2337 | |
0d62e5e8 DJ |
2338 | /* If we are waiting for a particular child, and it exited, |
2339 | linux_wait_for_event will return its exit status. Similarly if | |
2340 | the last child exited. If this is not the last child, however, | |
2341 | do not report it as exited until there is a 'thread exited' response | |
2342 | available in the remote protocol. Instead, just wait for another event. | |
2343 | This should be safe, because if the thread crashed we will already | |
2344 | have reported the termination signal to GDB; that should stop any | |
2345 | in-progress stepping operations, etc. | |
2346 | ||
2347 | Report the exit status of the last thread to exit. This matches | |
2348 | LinuxThreads' behavior. */ | |
2349 | ||
95954743 | 2350 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2351 | { |
bd99dc85 | 2352 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2353 | { |
bd99dc85 PA |
2354 | if (WIFEXITED (w)) |
2355 | { | |
2356 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2357 | ourstatus->value.integer = WEXITSTATUS (w); | |
2358 | ||
2359 | if (debug_threads) | |
493e2a69 MS |
2360 | fprintf (stderr, |
2361 | "\nChild exited with retcode = %x \n", | |
2362 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2363 | } |
2364 | else | |
2365 | { | |
2366 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2367 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
2368 | ||
2369 | if (debug_threads) | |
493e2a69 MS |
2370 | fprintf (stderr, |
2371 | "\nChild terminated with signal = %x \n", | |
2372 | WTERMSIG (w)); | |
bd99dc85 PA |
2373 | |
2374 | } | |
5b1c542e | 2375 | |
3e4c1235 | 2376 | return ptid_of (event_child); |
0d62e5e8 | 2377 | } |
da6d8c04 | 2378 | } |
0d62e5e8 | 2379 | else |
da6d8c04 | 2380 | { |
0d62e5e8 DJ |
2381 | if (!WIFSTOPPED (w)) |
2382 | goto retry; | |
da6d8c04 DJ |
2383 | } |
2384 | ||
6bf5e0ba PA |
2385 | /* If this event was not handled before, and is not a SIGTRAP, we |
2386 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2387 | a breakpoint is inserted at the current PC. If this target does | |
2388 | not support internal breakpoints at all, we also report the | |
2389 | SIGTRAP without further processing; it's of no concern to us. */ | |
2390 | maybe_internal_trap | |
2391 | = (supports_breakpoints () | |
2392 | && (WSTOPSIG (w) == SIGTRAP | |
2393 | || ((WSTOPSIG (w) == SIGILL | |
2394 | || WSTOPSIG (w) == SIGSEGV) | |
2395 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2396 | ||
2397 | if (maybe_internal_trap) | |
2398 | { | |
2399 | /* Handle anything that requires bookkeeping before deciding to | |
2400 | report the event or continue waiting. */ | |
2401 | ||
2402 | /* First check if we can explain the SIGTRAP with an internal | |
2403 | breakpoint, or if we should possibly report the event to GDB. | |
2404 | Do this before anything that may remove or insert a | |
2405 | breakpoint. */ | |
2406 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2407 | ||
2408 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2409 | finished. If so, tweak the state machine accordingly, | |
2410 | reinsert breakpoints and delete any reinsert (software | |
2411 | single-step) breakpoints. */ | |
2412 | step_over_finished = finish_step_over (event_child); | |
2413 | ||
2414 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2415 | check_breakpoints (event_child->stop_pc); | |
2416 | ||
219f2f23 PA |
2417 | /* Handle tracepoint data collecting. This may overflow the |
2418 | trace buffer, and cause a tracing stop, removing | |
2419 | breakpoints. */ | |
2420 | trace_event = handle_tracepoints (event_child); | |
2421 | ||
6bf5e0ba PA |
2422 | if (bp_explains_trap) |
2423 | { | |
2424 | /* If we stepped or ran into an internal breakpoint, we've | |
2425 | already handled it. So next time we resume (from this | |
2426 | PC), we should step over it. */ | |
2427 | if (debug_threads) | |
2428 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2429 | ||
8b07ae33 PA |
2430 | if (breakpoint_here (event_child->stop_pc)) |
2431 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2432 | } |
2433 | } | |
2434 | else | |
2435 | { | |
2436 | /* We have some other signal, possibly a step-over dance was in | |
2437 | progress, and it should be cancelled too. */ | |
2438 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2439 | } |
2440 | ||
2441 | /* We have all the data we need. Either report the event to GDB, or | |
2442 | resume threads and keep waiting for more. */ | |
2443 | ||
2444 | /* If we're collecting a fast tracepoint, finish the collection and | |
2445 | move out of the jump pad before delivering a signal. See | |
2446 | linux_stabilize_threads. */ | |
2447 | ||
2448 | if (WIFSTOPPED (w) | |
2449 | && WSTOPSIG (w) != SIGTRAP | |
2450 | && supports_fast_tracepoints () | |
58b4daa5 | 2451 | && agent_loaded_p ()) |
fa593d66 PA |
2452 | { |
2453 | if (debug_threads) | |
2454 | fprintf (stderr, | |
2455 | "Got signal %d for LWP %ld. Check if we need " | |
2456 | "to defer or adjust it.\n", | |
2457 | WSTOPSIG (w), lwpid_of (event_child)); | |
2458 | ||
2459 | /* Allow debugging the jump pad itself. */ | |
2460 | if (current_inferior->last_resume_kind != resume_step | |
2461 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2462 | { | |
2463 | enqueue_one_deferred_signal (event_child, &w); | |
2464 | ||
2465 | if (debug_threads) | |
2466 | fprintf (stderr, | |
2467 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2468 | WSTOPSIG (w), lwpid_of (event_child)); | |
2469 | ||
2470 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2471 | goto retry; | |
2472 | } | |
2473 | } | |
219f2f23 | 2474 | |
fa593d66 PA |
2475 | if (event_child->collecting_fast_tracepoint) |
2476 | { | |
2477 | if (debug_threads) | |
2478 | fprintf (stderr, "\ | |
2479 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2480 | Check if we're already there.\n", | |
2481 | lwpid_of (event_child), | |
2482 | event_child->collecting_fast_tracepoint); | |
2483 | ||
2484 | trace_event = 1; | |
2485 | ||
2486 | event_child->collecting_fast_tracepoint | |
2487 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2488 | ||
2489 | if (event_child->collecting_fast_tracepoint != 1) | |
2490 | { | |
2491 | /* No longer need this breakpoint. */ | |
2492 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2493 | { | |
2494 | if (debug_threads) | |
2495 | fprintf (stderr, | |
2496 | "No longer need exit-jump-pad bkpt; removing it." | |
2497 | "stopping all threads momentarily.\n"); | |
2498 | ||
2499 | /* Other running threads could hit this breakpoint. | |
2500 | We don't handle moribund locations like GDB does, | |
2501 | instead we always pause all threads when removing | |
2502 | breakpoints, so that any step-over or | |
2503 | decr_pc_after_break adjustment is always taken | |
2504 | care of while the breakpoint is still | |
2505 | inserted. */ | |
2506 | stop_all_lwps (1, event_child); | |
2507 | cancel_breakpoints (); | |
2508 | ||
2509 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2510 | event_child->exit_jump_pad_bkpt = NULL; | |
2511 | ||
2512 | unstop_all_lwps (1, event_child); | |
2513 | ||
2514 | gdb_assert (event_child->suspended >= 0); | |
2515 | } | |
2516 | } | |
2517 | ||
2518 | if (event_child->collecting_fast_tracepoint == 0) | |
2519 | { | |
2520 | if (debug_threads) | |
2521 | fprintf (stderr, | |
2522 | "fast tracepoint finished " | |
2523 | "collecting successfully.\n"); | |
2524 | ||
2525 | /* We may have a deferred signal to report. */ | |
2526 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2527 | { | |
2528 | if (debug_threads) | |
2529 | fprintf (stderr, "dequeued one signal.\n"); | |
2530 | } | |
3c11dd79 | 2531 | else |
fa593d66 | 2532 | { |
3c11dd79 PA |
2533 | if (debug_threads) |
2534 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2535 | |
2536 | if (stabilizing_threads) | |
2537 | { | |
2538 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
2539 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2540 | return ptid_of (event_child); | |
2541 | } | |
2542 | } | |
2543 | } | |
6bf5e0ba PA |
2544 | } |
2545 | ||
e471f25b PA |
2546 | /* Check whether GDB would be interested in this event. */ |
2547 | ||
2548 | /* If GDB is not interested in this signal, don't stop other | |
2549 | threads, and don't report it to GDB. Just resume the inferior | |
2550 | right away. We do this for threading-related signals as well as | |
2551 | any that GDB specifically requested we ignore. But never ignore | |
2552 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2553 | stepping - they may require special handling to skip the signal | |
2554 | handler. */ | |
2555 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2556 | thread library? */ | |
2557 | if (WIFSTOPPED (w) | |
2558 | && current_inferior->last_resume_kind != resume_step | |
2559 | && ( | |
1a981360 | 2560 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2561 | (current_process ()->private->thread_db != NULL |
2562 | && (WSTOPSIG (w) == __SIGRTMIN | |
2563 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2564 | || | |
2565 | #endif | |
2566 | (pass_signals[target_signal_from_host (WSTOPSIG (w))] | |
2567 | && !(WSTOPSIG (w) == SIGSTOP | |
2568 | && current_inferior->last_resume_kind == resume_stop)))) | |
2569 | { | |
2570 | siginfo_t info, *info_p; | |
2571 | ||
2572 | if (debug_threads) | |
2573 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2574 | WSTOPSIG (w), lwpid_of (event_child)); | |
2575 | ||
2576 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) | |
2577 | info_p = &info; | |
2578 | else | |
2579 | info_p = NULL; | |
2580 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2581 | WSTOPSIG (w), info_p); | |
2582 | goto retry; | |
2583 | } | |
2584 | ||
2585 | /* If GDB wanted this thread to single step, we always want to | |
2586 | report the SIGTRAP, and let GDB handle it. Watchpoints should | |
2587 | always be reported. So should signals we can't explain. A | |
2588 | SIGTRAP we can't explain could be a GDB breakpoint --- we may or | |
2589 | not support Z0 breakpoints. If we do, we're be able to handle | |
2590 | GDB breakpoints on top of internal breakpoints, by handling the | |
2591 | internal breakpoint and still reporting the event to GDB. If we | |
2592 | don't, we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 2593 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 2594 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 2595 | || event_child->stopped_by_watchpoint |
493e2a69 MS |
2596 | || (!step_over_finished |
2597 | && !bp_explains_trap && !trace_event) | |
9f3a5c85 LM |
2598 | || (gdb_breakpoint_here (event_child->stop_pc) |
2599 | && gdb_condition_true_at_breakpoint (event_child->stop_pc))); | |
6bf5e0ba PA |
2600 | |
2601 | /* We found no reason GDB would want us to stop. We either hit one | |
2602 | of our own breakpoints, or finished an internal step GDB | |
2603 | shouldn't know about. */ | |
2604 | if (!report_to_gdb) | |
2605 | { | |
2606 | if (debug_threads) | |
2607 | { | |
2608 | if (bp_explains_trap) | |
2609 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2610 | if (step_over_finished) | |
2611 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2612 | if (trace_event) |
2613 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
2614 | } |
2615 | ||
2616 | /* We're not reporting this breakpoint to GDB, so apply the | |
2617 | decr_pc_after_break adjustment to the inferior's regcache | |
2618 | ourselves. */ | |
2619 | ||
2620 | if (the_low_target.set_pc != NULL) | |
2621 | { | |
2622 | struct regcache *regcache | |
2623 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2624 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2625 | } | |
2626 | ||
7984d532 PA |
2627 | /* We may have finished stepping over a breakpoint. If so, |
2628 | we've stopped and suspended all LWPs momentarily except the | |
2629 | stepping one. This is where we resume them all again. We're | |
2630 | going to keep waiting, so use proceed, which handles stepping | |
2631 | over the next breakpoint. */ | |
6bf5e0ba PA |
2632 | if (debug_threads) |
2633 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2634 | |
2635 | if (step_over_finished) | |
2636 | unsuspend_all_lwps (event_child); | |
2637 | ||
6bf5e0ba PA |
2638 | proceed_all_lwps (); |
2639 | goto retry; | |
2640 | } | |
2641 | ||
2642 | if (debug_threads) | |
2643 | { | |
8336d594 | 2644 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
2645 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
2646 | if (event_child->stopped_by_watchpoint) | |
2647 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2648 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2649 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2650 | if (debug_threads) |
2651 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2652 | } | |
2653 | ||
2654 | /* Alright, we're going to report a stop. */ | |
2655 | ||
fa593d66 | 2656 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2657 | { |
2658 | /* In all-stop, stop all threads. */ | |
7984d532 | 2659 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2660 | |
2661 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2662 | from among those that have had events. Giving equal priority | |
2663 | to all LWPs that have had events helps prevent | |
2664 | starvation. */ | |
2665 | if (ptid_equal (ptid, minus_one_ptid)) | |
2666 | { | |
2667 | event_child->status_pending_p = 1; | |
2668 | event_child->status_pending = w; | |
2669 | ||
2670 | select_event_lwp (&event_child); | |
2671 | ||
2672 | event_child->status_pending_p = 0; | |
2673 | w = event_child->status_pending; | |
2674 | } | |
2675 | ||
2676 | /* Now that we've selected our final event LWP, cancel any | |
2677 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2678 | See the comment in cancel_breakpoints_callback to find out | |
2679 | why. */ | |
2680 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 | 2681 | |
c03e6ccc YQ |
2682 | /* If we were going a step-over, all other threads but the stepping one |
2683 | had been paused in start_step_over, with their suspend counts | |
2684 | incremented. We don't want to do a full unstop/unpause, because we're | |
2685 | in all-stop mode (so we want threads stopped), but we still need to | |
2686 | unsuspend the other threads, to decrement their `suspended' count | |
2687 | back. */ | |
2688 | if (step_over_finished) | |
2689 | unsuspend_all_lwps (event_child); | |
2690 | ||
fa593d66 PA |
2691 | /* Stabilize threads (move out of jump pads). */ |
2692 | stabilize_threads (); | |
6bf5e0ba PA |
2693 | } |
2694 | else | |
2695 | { | |
2696 | /* If we just finished a step-over, then all threads had been | |
2697 | momentarily paused. In all-stop, that's fine, we want | |
2698 | threads stopped by now anyway. In non-stop, we need to | |
2699 | re-resume threads that GDB wanted to be running. */ | |
2700 | if (step_over_finished) | |
7984d532 | 2701 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2702 | } |
2703 | ||
5b1c542e | 2704 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2705 | |
8336d594 PA |
2706 | if (current_inferior->last_resume_kind == resume_stop |
2707 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2708 | { |
2709 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2710 | and it stopped cleanly, so report as SIG0. The use of | |
2711 | SIGSTOP is an implementation detail. */ | |
2712 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2713 | } | |
8336d594 PA |
2714 | else if (current_inferior->last_resume_kind == resume_stop |
2715 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2716 | { |
2717 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2718 | but, it stopped for other reasons. */ |
bd99dc85 PA |
2719 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
2720 | } | |
2721 | else | |
2722 | { | |
2723 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
2724 | } | |
2725 | ||
d50171e4 PA |
2726 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2727 | ||
bd99dc85 | 2728 | if (debug_threads) |
95954743 | 2729 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2730 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2731 | ourstatus->kind, |
2732 | ourstatus->value.sig); | |
2733 | ||
6bf5e0ba | 2734 | return ptid_of (event_child); |
bd99dc85 PA |
2735 | } |
2736 | ||
2737 | /* Get rid of any pending event in the pipe. */ | |
2738 | static void | |
2739 | async_file_flush (void) | |
2740 | { | |
2741 | int ret; | |
2742 | char buf; | |
2743 | ||
2744 | do | |
2745 | ret = read (linux_event_pipe[0], &buf, 1); | |
2746 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2747 | } | |
2748 | ||
2749 | /* Put something in the pipe, so the event loop wakes up. */ | |
2750 | static void | |
2751 | async_file_mark (void) | |
2752 | { | |
2753 | int ret; | |
2754 | ||
2755 | async_file_flush (); | |
2756 | ||
2757 | do | |
2758 | ret = write (linux_event_pipe[1], "+", 1); | |
2759 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2760 | ||
2761 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2762 | be awakened anyway. */ | |
2763 | } | |
2764 | ||
95954743 PA |
2765 | static ptid_t |
2766 | linux_wait (ptid_t ptid, | |
2767 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2768 | { |
95954743 | 2769 | ptid_t event_ptid; |
bd99dc85 PA |
2770 | |
2771 | if (debug_threads) | |
95954743 | 2772 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2773 | |
2774 | /* Flush the async file first. */ | |
2775 | if (target_is_async_p ()) | |
2776 | async_file_flush (); | |
2777 | ||
95954743 | 2778 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2779 | |
2780 | /* If at least one stop was reported, there may be more. A single | |
2781 | SIGCHLD can signal more than one child stop. */ | |
2782 | if (target_is_async_p () | |
2783 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2784 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2785 | async_file_mark (); |
2786 | ||
2787 | return event_ptid; | |
da6d8c04 DJ |
2788 | } |
2789 | ||
c5f62d5f | 2790 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2791 | |
2792 | static int | |
a1928bad | 2793 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2794 | { |
c5f62d5f DE |
2795 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2796 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2797 | |
c5f62d5f DE |
2798 | #ifdef __NR_tkill |
2799 | { | |
2800 | static int tkill_failed; | |
fd500816 | 2801 | |
c5f62d5f DE |
2802 | if (!tkill_failed) |
2803 | { | |
2804 | int ret; | |
2805 | ||
2806 | errno = 0; | |
2807 | ret = syscall (__NR_tkill, lwpid, signo); | |
2808 | if (errno != ENOSYS) | |
2809 | return ret; | |
2810 | tkill_failed = 1; | |
2811 | } | |
2812 | } | |
fd500816 DJ |
2813 | #endif |
2814 | ||
2815 | return kill (lwpid, signo); | |
2816 | } | |
2817 | ||
964e4306 PA |
2818 | void |
2819 | linux_stop_lwp (struct lwp_info *lwp) | |
2820 | { | |
2821 | send_sigstop (lwp); | |
2822 | } | |
2823 | ||
0d62e5e8 | 2824 | static void |
02fc4de7 | 2825 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2826 | { |
bd99dc85 | 2827 | int pid; |
0d62e5e8 | 2828 | |
bd99dc85 PA |
2829 | pid = lwpid_of (lwp); |
2830 | ||
0d62e5e8 DJ |
2831 | /* If we already have a pending stop signal for this process, don't |
2832 | send another. */ | |
54a0b537 | 2833 | if (lwp->stop_expected) |
0d62e5e8 | 2834 | { |
ae13219e | 2835 | if (debug_threads) |
bd99dc85 | 2836 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2837 | |
0d62e5e8 DJ |
2838 | return; |
2839 | } | |
2840 | ||
2841 | if (debug_threads) | |
bd99dc85 | 2842 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2843 | |
d50171e4 | 2844 | lwp->stop_expected = 1; |
bd99dc85 | 2845 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2846 | } |
2847 | ||
7984d532 PA |
2848 | static int |
2849 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2850 | { |
2851 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2852 | ||
7984d532 PA |
2853 | /* Ignore EXCEPT. */ |
2854 | if (lwp == except) | |
2855 | return 0; | |
2856 | ||
02fc4de7 | 2857 | if (lwp->stopped) |
7984d532 | 2858 | return 0; |
02fc4de7 PA |
2859 | |
2860 | send_sigstop (lwp); | |
7984d532 PA |
2861 | return 0; |
2862 | } | |
2863 | ||
2864 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2865 | yet. */ | |
2866 | static int | |
2867 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2868 | void *except) | |
2869 | { | |
2870 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2871 | ||
2872 | /* Ignore EXCEPT. */ | |
2873 | if (lwp == except) | |
2874 | return 0; | |
2875 | ||
2876 | lwp->suspended++; | |
2877 | ||
2878 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2879 | } |
2880 | ||
95954743 PA |
2881 | static void |
2882 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2883 | { | |
2884 | /* It's dead, really. */ | |
2885 | lwp->dead = 1; | |
2886 | ||
2887 | /* Store the exit status for later. */ | |
2888 | lwp->status_pending_p = 1; | |
2889 | lwp->status_pending = wstat; | |
2890 | ||
95954743 PA |
2891 | /* Prevent trying to stop it. */ |
2892 | lwp->stopped = 1; | |
2893 | ||
2894 | /* No further stops are expected from a dead lwp. */ | |
2895 | lwp->stop_expected = 0; | |
2896 | } | |
2897 | ||
0d62e5e8 DJ |
2898 | static void |
2899 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2900 | { | |
54a0b537 | 2901 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2902 | struct thread_info *saved_inferior; |
a1928bad | 2903 | int wstat; |
95954743 PA |
2904 | ptid_t saved_tid; |
2905 | ptid_t ptid; | |
d50171e4 | 2906 | int pid; |
0d62e5e8 | 2907 | |
54a0b537 | 2908 | if (lwp->stopped) |
d50171e4 PA |
2909 | { |
2910 | if (debug_threads) | |
2911 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2912 | lwpid_of (lwp)); | |
2913 | return; | |
2914 | } | |
0d62e5e8 DJ |
2915 | |
2916 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2917 | if (saved_inferior != NULL) |
2918 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2919 | else | |
95954743 | 2920 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2921 | |
95954743 | 2922 | ptid = lwp->head.id; |
bd99dc85 | 2923 | |
d50171e4 PA |
2924 | if (debug_threads) |
2925 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2926 | ||
2927 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2928 | |
2929 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2930 | and record the pending SIGSTOP. If the process exited, just | |
2931 | return. */ | |
d50171e4 | 2932 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2933 | { |
2934 | if (debug_threads) | |
d50171e4 PA |
2935 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2936 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2937 | |
d50171e4 | 2938 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2939 | { |
2940 | if (debug_threads) | |
d50171e4 PA |
2941 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2942 | lwpid_of (lwp), wstat); | |
2943 | ||
c35fafde PA |
2944 | lwp->status_pending_p = 1; |
2945 | lwp->status_pending = wstat; | |
2946 | } | |
0d62e5e8 | 2947 | } |
d50171e4 | 2948 | else |
95954743 PA |
2949 | { |
2950 | if (debug_threads) | |
d50171e4 | 2951 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2952 | |
d50171e4 PA |
2953 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2954 | if (lwp) | |
2955 | { | |
2956 | /* Leave this status pending for the next time we're able to | |
2957 | report it. In the mean time, we'll report this lwp as | |
2958 | dead to GDB, so GDB doesn't try to read registers and | |
2959 | memory from it. This can only happen if this was the | |
2960 | last thread of the process; otherwise, PID is removed | |
2961 | from the thread tables before linux_wait_for_event | |
2962 | returns. */ | |
2963 | mark_lwp_dead (lwp, wstat); | |
2964 | } | |
95954743 | 2965 | } |
0d62e5e8 | 2966 | |
bd99dc85 | 2967 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2968 | current_inferior = saved_inferior; |
2969 | else | |
2970 | { | |
2971 | if (debug_threads) | |
2972 | fprintf (stderr, "Previously current thread died.\n"); | |
2973 | ||
bd99dc85 PA |
2974 | if (non_stop) |
2975 | { | |
2976 | /* We can't change the current inferior behind GDB's back, | |
2977 | otherwise, a subsequent command may apply to the wrong | |
2978 | process. */ | |
2979 | current_inferior = NULL; | |
2980 | } | |
2981 | else | |
2982 | { | |
2983 | /* Set a valid thread as current. */ | |
2984 | set_desired_inferior (0); | |
2985 | } | |
0d62e5e8 DJ |
2986 | } |
2987 | } | |
2988 | ||
fa593d66 PA |
2989 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
2990 | move it out, because we need to report the stop event to GDB. For | |
2991 | example, if the user puts a breakpoint in the jump pad, it's | |
2992 | because she wants to debug it. */ | |
2993 | ||
2994 | static int | |
2995 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
2996 | { | |
2997 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2998 | struct thread_info *thread = get_lwp_thread (lwp); | |
2999 | ||
3000 | gdb_assert (lwp->suspended == 0); | |
3001 | gdb_assert (lwp->stopped); | |
3002 | ||
3003 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3004 | return (supports_fast_tracepoints () | |
58b4daa5 | 3005 | && agent_loaded_p () |
fa593d66 PA |
3006 | && (gdb_breakpoint_here (lwp->stop_pc) |
3007 | || lwp->stopped_by_watchpoint | |
3008 | || thread->last_resume_kind == resume_step) | |
3009 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3010 | } | |
3011 | ||
3012 | static void | |
3013 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3014 | { | |
3015 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3016 | struct thread_info *thread = get_lwp_thread (lwp); | |
3017 | int *wstat; | |
3018 | ||
3019 | gdb_assert (lwp->suspended == 0); | |
3020 | gdb_assert (lwp->stopped); | |
3021 | ||
3022 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3023 | ||
3024 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3025 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
3026 | && !lwp->stopped_by_watchpoint | |
3027 | && thread->last_resume_kind != resume_step | |
3028 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3029 | { | |
3030 | if (debug_threads) | |
3031 | fprintf (stderr, | |
3032 | "LWP %ld needs stabilizing (in jump pad)\n", | |
3033 | lwpid_of (lwp)); | |
3034 | ||
3035 | if (wstat) | |
3036 | { | |
3037 | lwp->status_pending_p = 0; | |
3038 | enqueue_one_deferred_signal (lwp, wstat); | |
3039 | ||
3040 | if (debug_threads) | |
3041 | fprintf (stderr, | |
3042 | "Signal %d for LWP %ld deferred " | |
3043 | "(in jump pad)\n", | |
3044 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
3045 | } | |
3046 | ||
3047 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3048 | } | |
3049 | else | |
3050 | lwp->suspended++; | |
3051 | } | |
3052 | ||
3053 | static int | |
3054 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3055 | { | |
3056 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3057 | ||
3058 | if (lwp->dead) | |
3059 | return 0; | |
3060 | if (lwp->stopped) | |
3061 | return 0; | |
3062 | return 1; | |
3063 | } | |
3064 | ||
7984d532 PA |
3065 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3066 | If SUSPEND, then also increase the suspend count of every LWP, | |
3067 | except EXCEPT. */ | |
3068 | ||
0d62e5e8 | 3069 | static void |
7984d532 | 3070 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 DJ |
3071 | { |
3072 | stopping_threads = 1; | |
7984d532 PA |
3073 | |
3074 | if (suspend) | |
3075 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
3076 | else | |
3077 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 3078 | for_each_inferior (&all_lwps, wait_for_sigstop); |
0d62e5e8 DJ |
3079 | stopping_threads = 0; |
3080 | } | |
3081 | ||
da6d8c04 DJ |
3082 | /* Resume execution of the inferior process. |
3083 | If STEP is nonzero, single-step it. | |
3084 | If SIGNAL is nonzero, give it that signal. */ | |
3085 | ||
ce3a066d | 3086 | static void |
2acc282a | 3087 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3088 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3089 | { |
0d62e5e8 | 3090 | struct thread_info *saved_inferior; |
fa593d66 | 3091 | int fast_tp_collecting; |
0d62e5e8 | 3092 | |
54a0b537 | 3093 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3094 | return; |
3095 | ||
fa593d66 PA |
3096 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3097 | ||
3098 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3099 | ||
219f2f23 PA |
3100 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3101 | user used the "jump" command, or "set $pc = foo"). */ | |
3102 | if (lwp->stop_pc != get_pc (lwp)) | |
3103 | { | |
3104 | /* Collecting 'while-stepping' actions doesn't make sense | |
3105 | anymore. */ | |
3106 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
3107 | } | |
3108 | ||
0d62e5e8 DJ |
3109 | /* If we have pending signals or status, and a new signal, enqueue the |
3110 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3111 | breakpoint; it will be picked up again below. */ | |
3112 | if (signal != 0 | |
fa593d66 PA |
3113 | && (lwp->status_pending_p |
3114 | || lwp->pending_signals != NULL | |
3115 | || lwp->bp_reinsert != 0 | |
3116 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3117 | { |
3118 | struct pending_signals *p_sig; | |
bca929d3 | 3119 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3120 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3121 | p_sig->signal = signal; |
32ca6d61 DJ |
3122 | if (info == NULL) |
3123 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3124 | else | |
3125 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3126 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3127 | } |
3128 | ||
d50171e4 PA |
3129 | if (lwp->status_pending_p) |
3130 | { | |
3131 | if (debug_threads) | |
3132 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
3133 | " has pending status\n", | |
3134 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
3135 | lwp->stop_expected ? "expected" : "not expected"); | |
3136 | return; | |
3137 | } | |
0d62e5e8 DJ |
3138 | |
3139 | saved_inferior = current_inferior; | |
54a0b537 | 3140 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
3141 | |
3142 | if (debug_threads) | |
1b3f6016 | 3143 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 3144 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 3145 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3146 | |
3147 | /* This bit needs some thinking about. If we get a signal that | |
3148 | we must report while a single-step reinsert is still pending, | |
3149 | we often end up resuming the thread. It might be better to | |
3150 | (ew) allow a stack of pending events; then we could be sure that | |
3151 | the reinsert happened right away and not lose any signals. | |
3152 | ||
3153 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3154 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3155 | complete correctness, so it won't solve that problem. It may be |
3156 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3157 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3158 | { |
3159 | if (debug_threads) | |
d50171e4 PA |
3160 | fprintf (stderr, " pending reinsert at 0x%s\n", |
3161 | paddress (lwp->bp_reinsert)); | |
3162 | ||
3163 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
3164 | { | |
fa593d66 PA |
3165 | if (fast_tp_collecting == 0) |
3166 | { | |
3167 | if (step == 0) | |
3168 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3169 | if (lwp->suspended) | |
3170 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3171 | lwp->suspended); | |
3172 | } | |
d50171e4 PA |
3173 | |
3174 | step = 1; | |
3175 | } | |
0d62e5e8 DJ |
3176 | |
3177 | /* Postpone any pending signal. It was enqueued above. */ | |
3178 | signal = 0; | |
3179 | } | |
3180 | ||
fa593d66 PA |
3181 | if (fast_tp_collecting == 1) |
3182 | { | |
3183 | if (debug_threads) | |
3184 | fprintf (stderr, "\ | |
3185 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
3186 | lwpid_of (lwp)); | |
3187 | ||
3188 | /* Postpone any pending signal. It was enqueued above. */ | |
3189 | signal = 0; | |
3190 | } | |
3191 | else if (fast_tp_collecting == 2) | |
3192 | { | |
3193 | if (debug_threads) | |
3194 | fprintf (stderr, "\ | |
3195 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
3196 | lwpid_of (lwp)); | |
3197 | ||
3198 | if (can_hardware_single_step ()) | |
3199 | step = 1; | |
3200 | else | |
3201 | fatal ("moving out of jump pad single-stepping" | |
3202 | " not implemented on this target"); | |
3203 | ||
3204 | /* Postpone any pending signal. It was enqueued above. */ | |
3205 | signal = 0; | |
3206 | } | |
3207 | ||
219f2f23 PA |
3208 | /* If we have while-stepping actions in this thread set it stepping. |
3209 | If we have a signal to deliver, it may or may not be set to | |
3210 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3211 | while-stepping into a signal handler. A possible smart thing to | |
3212 | do would be to set an internal breakpoint at the signal return | |
3213 | address, continue, and carry on catching this while-stepping | |
3214 | action only when that breakpoint is hit. A future | |
3215 | enhancement. */ | |
3216 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
3217 | && can_hardware_single_step ()) | |
3218 | { | |
3219 | if (debug_threads) | |
3220 | fprintf (stderr, | |
3221 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
3222 | lwpid_of (lwp)); | |
3223 | step = 1; | |
3224 | } | |
3225 | ||
aa691b87 | 3226 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3227 | { |
442ea881 PA |
3228 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3229 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 3230 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3231 | } |
3232 | ||
fa593d66 PA |
3233 | /* If we have pending signals, consume one unless we are trying to |
3234 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3235 | collect. */ | |
3236 | if (lwp->pending_signals != NULL | |
3237 | && lwp->bp_reinsert == 0 | |
3238 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3239 | { |
3240 | struct pending_signals **p_sig; | |
3241 | ||
54a0b537 | 3242 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3243 | while ((*p_sig)->prev != NULL) |
3244 | p_sig = &(*p_sig)->prev; | |
3245 | ||
3246 | signal = (*p_sig)->signal; | |
32ca6d61 | 3247 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 3248 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 3249 | |
0d62e5e8 DJ |
3250 | free (*p_sig); |
3251 | *p_sig = NULL; | |
3252 | } | |
3253 | ||
aa5ca48f DE |
3254 | if (the_low_target.prepare_to_resume != NULL) |
3255 | the_low_target.prepare_to_resume (lwp); | |
3256 | ||
0d62e5e8 | 3257 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 3258 | get_lwp_thread (lwp)); |
da6d8c04 | 3259 | errno = 0; |
54a0b537 | 3260 | lwp->stopped = 0; |
c3adc08c | 3261 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3262 | lwp->stepping = step; |
14ce3065 DE |
3263 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
3264 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3265 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3266 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
3267 | |
3268 | current_inferior = saved_inferior; | |
da6d8c04 | 3269 | if (errno) |
3221518c UW |
3270 | { |
3271 | /* ESRCH from ptrace either means that the thread was already | |
3272 | running (an error) or that it is gone (a race condition). If | |
3273 | it's gone, we will get a notification the next time we wait, | |
3274 | so we can ignore the error. We could differentiate these | |
3275 | two, but it's tricky without waiting; the thread still exists | |
3276 | as a zombie, so sending it signal 0 would succeed. So just | |
3277 | ignore ESRCH. */ | |
3278 | if (errno == ESRCH) | |
3279 | return; | |
3280 | ||
3281 | perror_with_name ("ptrace"); | |
3282 | } | |
da6d8c04 DJ |
3283 | } |
3284 | ||
2bd7c093 PA |
3285 | struct thread_resume_array |
3286 | { | |
3287 | struct thread_resume *resume; | |
3288 | size_t n; | |
3289 | }; | |
64386c31 DJ |
3290 | |
3291 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
3292 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
3293 | resume request. | |
3294 | ||
3295 | This algorithm is O(threads * resume elements), but resume elements | |
3296 | is small (and will remain small at least until GDB supports thread | |
3297 | suspension). */ | |
2bd7c093 PA |
3298 | static int |
3299 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3300 | { |
54a0b537 | 3301 | struct lwp_info *lwp; |
64386c31 | 3302 | struct thread_info *thread; |
5544ad89 | 3303 | int ndx; |
2bd7c093 | 3304 | struct thread_resume_array *r; |
64386c31 DJ |
3305 | |
3306 | thread = (struct thread_info *) entry; | |
54a0b537 | 3307 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3308 | r = arg; |
64386c31 | 3309 | |
2bd7c093 | 3310 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3311 | { |
3312 | ptid_t ptid = r->resume[ndx].thread; | |
3313 | if (ptid_equal (ptid, minus_one_ptid) | |
3314 | || ptid_equal (ptid, entry->id) | |
3315 | || (ptid_is_pid (ptid) | |
3316 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
3317 | || (ptid_get_lwp (ptid) == -1 | |
3318 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
3319 | { | |
d50171e4 | 3320 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3321 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3322 | { |
3323 | if (debug_threads) | |
3324 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3325 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3326 | ? "stopped" | |
3327 | : "stopping", | |
3328 | lwpid_of (lwp)); | |
3329 | ||
3330 | continue; | |
3331 | } | |
3332 | ||
95954743 | 3333 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3334 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 PA |
3335 | |
3336 | /* If we had a deferred signal to report, dequeue one now. | |
3337 | This can happen if LWP gets more than one signal while | |
3338 | trying to get out of a jump pad. */ | |
3339 | if (lwp->stopped | |
3340 | && !lwp->status_pending_p | |
3341 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3342 | { | |
3343 | lwp->status_pending_p = 1; | |
3344 | ||
3345 | if (debug_threads) | |
3346 | fprintf (stderr, | |
3347 | "Dequeueing deferred signal %d for LWP %ld, " | |
3348 | "leaving status pending.\n", | |
3349 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3350 | } | |
3351 | ||
95954743 PA |
3352 | return 0; |
3353 | } | |
3354 | } | |
2bd7c093 PA |
3355 | |
3356 | /* No resume action for this thread. */ | |
3357 | lwp->resume = NULL; | |
64386c31 | 3358 | |
2bd7c093 | 3359 | return 0; |
5544ad89 DJ |
3360 | } |
3361 | ||
5544ad89 | 3362 | |
bd99dc85 PA |
3363 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3364 | static int | |
3365 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3366 | { |
bd99dc85 | 3367 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3368 | |
bd99dc85 PA |
3369 | /* LWPs which will not be resumed are not interesting, because |
3370 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3371 | if (lwp->resume == NULL) |
bd99dc85 | 3372 | return 0; |
64386c31 | 3373 | |
bd99dc85 | 3374 | if (lwp->status_pending_p) |
d50171e4 PA |
3375 | * (int *) flag_p = 1; |
3376 | ||
3377 | return 0; | |
3378 | } | |
3379 | ||
3380 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3381 | internal breakpoint that we need to step over. It assumes that any | |
3382 | required STOP_PC adjustment has already been propagated to the | |
3383 | inferior's regcache. */ | |
3384 | ||
3385 | static int | |
3386 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3387 | { | |
3388 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3389 | struct thread_info *thread; |
d50171e4 PA |
3390 | struct thread_info *saved_inferior; |
3391 | CORE_ADDR pc; | |
3392 | ||
3393 | /* LWPs which will not be resumed are not interesting, because we | |
3394 | might not wait for them next time through linux_wait. */ | |
3395 | ||
3396 | if (!lwp->stopped) | |
3397 | { | |
3398 | if (debug_threads) | |
3399 | fprintf (stderr, | |
3400 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3401 | lwpid_of (lwp)); | |
3402 | return 0; | |
3403 | } | |
3404 | ||
8336d594 PA |
3405 | thread = get_lwp_thread (lwp); |
3406 | ||
3407 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3408 | { |
3409 | if (debug_threads) | |
3410 | fprintf (stderr, | |
3411 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3412 | lwpid_of (lwp)); | |
3413 | return 0; | |
3414 | } | |
3415 | ||
7984d532 PA |
3416 | gdb_assert (lwp->suspended >= 0); |
3417 | ||
3418 | if (lwp->suspended) | |
3419 | { | |
3420 | if (debug_threads) | |
3421 | fprintf (stderr, | |
3422 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3423 | lwpid_of (lwp)); | |
3424 | return 0; | |
3425 | } | |
3426 | ||
d50171e4 PA |
3427 | if (!lwp->need_step_over) |
3428 | { | |
3429 | if (debug_threads) | |
3430 | fprintf (stderr, | |
3431 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3432 | } | |
5544ad89 | 3433 | |
bd99dc85 | 3434 | if (lwp->status_pending_p) |
d50171e4 PA |
3435 | { |
3436 | if (debug_threads) | |
3437 | fprintf (stderr, | |
3438 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3439 | lwpid_of (lwp)); | |
3440 | return 0; | |
3441 | } | |
3442 | ||
3443 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3444 | or we have. */ | |
3445 | pc = get_pc (lwp); | |
3446 | ||
3447 | /* If the PC has changed since we stopped, then don't do anything, | |
3448 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3449 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3450 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3451 | command, or poked thread's registers herself. */ | |
3452 | if (pc != lwp->stop_pc) | |
3453 | { | |
3454 | if (debug_threads) | |
3455 | fprintf (stderr, | |
3456 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3457 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3458 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3459 | ||
3460 | lwp->need_step_over = 0; | |
3461 | return 0; | |
3462 | } | |
3463 | ||
3464 | saved_inferior = current_inferior; | |
8336d594 | 3465 | current_inferior = thread; |
d50171e4 | 3466 | |
8b07ae33 | 3467 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3468 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3469 | { |
8b07ae33 | 3470 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3471 | though. If the condition is being evaluated on the target's side |
3472 | and it evaluate to false, step over this breakpoint as well. */ | |
3473 | if (gdb_breakpoint_here (pc) | |
3474 | && gdb_condition_true_at_breakpoint (pc)) | |
8b07ae33 PA |
3475 | { |
3476 | if (debug_threads) | |
3477 | fprintf (stderr, | |
3478 | "Need step over [LWP %ld]? yes, but found" | |
3479 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3480 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3481 | |
8b07ae33 PA |
3482 | current_inferior = saved_inferior; |
3483 | return 0; | |
3484 | } | |
3485 | else | |
3486 | { | |
3487 | if (debug_threads) | |
3488 | fprintf (stderr, | |
493e2a69 MS |
3489 | "Need step over [LWP %ld]? yes, " |
3490 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3491 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3492 | |
8b07ae33 PA |
3493 | /* We've found an lwp that needs stepping over --- return 1 so |
3494 | that find_inferior stops looking. */ | |
3495 | current_inferior = saved_inferior; | |
3496 | ||
3497 | /* If the step over is cancelled, this is set again. */ | |
3498 | lwp->need_step_over = 0; | |
3499 | return 1; | |
3500 | } | |
d50171e4 PA |
3501 | } |
3502 | ||
3503 | current_inferior = saved_inferior; | |
3504 | ||
3505 | if (debug_threads) | |
3506 | fprintf (stderr, | |
3507 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3508 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3509 | |
bd99dc85 | 3510 | return 0; |
5544ad89 DJ |
3511 | } |
3512 | ||
d50171e4 PA |
3513 | /* Start a step-over operation on LWP. When LWP stopped at a |
3514 | breakpoint, to make progress, we need to remove the breakpoint out | |
3515 | of the way. If we let other threads run while we do that, they may | |
3516 | pass by the breakpoint location and miss hitting it. To avoid | |
3517 | that, a step-over momentarily stops all threads while LWP is | |
3518 | single-stepped while the breakpoint is temporarily uninserted from | |
3519 | the inferior. When the single-step finishes, we reinsert the | |
3520 | breakpoint, and let all threads that are supposed to be running, | |
3521 | run again. | |
3522 | ||
3523 | On targets that don't support hardware single-step, we don't | |
3524 | currently support full software single-stepping. Instead, we only | |
3525 | support stepping over the thread event breakpoint, by asking the | |
3526 | low target where to place a reinsert breakpoint. Since this | |
3527 | routine assumes the breakpoint being stepped over is a thread event | |
3528 | breakpoint, it usually assumes the return address of the current | |
3529 | function is a good enough place to set the reinsert breakpoint. */ | |
3530 | ||
3531 | static int | |
3532 | start_step_over (struct lwp_info *lwp) | |
3533 | { | |
3534 | struct thread_info *saved_inferior; | |
3535 | CORE_ADDR pc; | |
3536 | int step; | |
3537 | ||
3538 | if (debug_threads) | |
3539 | fprintf (stderr, | |
3540 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3541 | lwpid_of (lwp)); | |
3542 | ||
7984d532 PA |
3543 | stop_all_lwps (1, lwp); |
3544 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3545 | |
3546 | if (debug_threads) | |
3547 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3548 | ||
3549 | /* Note, we should always reach here with an already adjusted PC, | |
3550 | either by GDB (if we're resuming due to GDB's request), or by our | |
3551 | caller, if we just finished handling an internal breakpoint GDB | |
3552 | shouldn't care about. */ | |
3553 | pc = get_pc (lwp); | |
3554 | ||
3555 | saved_inferior = current_inferior; | |
3556 | current_inferior = get_lwp_thread (lwp); | |
3557 | ||
3558 | lwp->bp_reinsert = pc; | |
3559 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3560 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3561 | |
3562 | if (can_hardware_single_step ()) | |
3563 | { | |
3564 | step = 1; | |
3565 | } | |
3566 | else | |
3567 | { | |
3568 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3569 | set_reinsert_breakpoint (raddr); | |
3570 | step = 0; | |
3571 | } | |
3572 | ||
3573 | current_inferior = saved_inferior; | |
3574 | ||
3575 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3576 | ||
3577 | /* Require next event from this LWP. */ | |
3578 | step_over_bkpt = lwp->head.id; | |
3579 | return 1; | |
3580 | } | |
3581 | ||
3582 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3583 | start_step_over, if still there, and delete any reinsert | |
3584 | breakpoints we've set, on non hardware single-step targets. */ | |
3585 | ||
3586 | static int | |
3587 | finish_step_over (struct lwp_info *lwp) | |
3588 | { | |
3589 | if (lwp->bp_reinsert != 0) | |
3590 | { | |
3591 | if (debug_threads) | |
3592 | fprintf (stderr, "Finished step over.\n"); | |
3593 | ||
3594 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3595 | may be no breakpoint to reinsert there by now. */ | |
3596 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3597 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3598 | |
3599 | lwp->bp_reinsert = 0; | |
3600 | ||
3601 | /* Delete any software-single-step reinsert breakpoints. No | |
3602 | longer needed. We don't have to worry about other threads | |
3603 | hitting this trap, and later not being able to explain it, | |
3604 | because we were stepping over a breakpoint, and we hold all | |
3605 | threads but LWP stopped while doing that. */ | |
3606 | if (!can_hardware_single_step ()) | |
3607 | delete_reinsert_breakpoints (); | |
3608 | ||
3609 | step_over_bkpt = null_ptid; | |
3610 | return 1; | |
3611 | } | |
3612 | else | |
3613 | return 0; | |
3614 | } | |
3615 | ||
5544ad89 DJ |
3616 | /* This function is called once per thread. We check the thread's resume |
3617 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3618 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3619 | |
bd99dc85 PA |
3620 | For threads which we aren't explicitly told otherwise, we preserve |
3621 | the stepping flag; this is used for stepping over gdbserver-placed | |
3622 | breakpoints. | |
3623 | ||
3624 | If pending_flags was set in any thread, we queue any needed | |
3625 | signals, since we won't actually resume. We already have a pending | |
3626 | event to report, so we don't need to preserve any step requests; | |
3627 | they should be re-issued if necessary. */ | |
3628 | ||
3629 | static int | |
3630 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3631 | { |
54a0b537 | 3632 | struct lwp_info *lwp; |
5544ad89 | 3633 | struct thread_info *thread; |
bd99dc85 | 3634 | int step; |
d50171e4 PA |
3635 | int leave_all_stopped = * (int *) arg; |
3636 | int leave_pending; | |
5544ad89 DJ |
3637 | |
3638 | thread = (struct thread_info *) entry; | |
54a0b537 | 3639 | lwp = get_thread_lwp (thread); |
5544ad89 | 3640 | |
2bd7c093 | 3641 | if (lwp->resume == NULL) |
bd99dc85 | 3642 | return 0; |
5544ad89 | 3643 | |
bd99dc85 | 3644 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3645 | { |
bd99dc85 | 3646 | if (debug_threads) |
d50171e4 | 3647 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3648 | |
3649 | if (!lwp->stopped) | |
3650 | { | |
3651 | if (debug_threads) | |
d50171e4 | 3652 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3653 | |
d50171e4 PA |
3654 | /* Stop the thread, and wait for the event asynchronously, |
3655 | through the event loop. */ | |
02fc4de7 | 3656 | send_sigstop (lwp); |
bd99dc85 PA |
3657 | } |
3658 | else | |
3659 | { | |
3660 | if (debug_threads) | |
d50171e4 PA |
3661 | fprintf (stderr, "already stopped LWP %ld\n", |
3662 | lwpid_of (lwp)); | |
3663 | ||
3664 | /* The LWP may have been stopped in an internal event that | |
3665 | was not meant to be notified back to GDB (e.g., gdbserver | |
3666 | breakpoint), so we should be reporting a stop event in | |
3667 | this case too. */ | |
3668 | ||
3669 | /* If the thread already has a pending SIGSTOP, this is a | |
3670 | no-op. Otherwise, something later will presumably resume | |
3671 | the thread and this will cause it to cancel any pending | |
3672 | operation, due to last_resume_kind == resume_stop. If | |
3673 | the thread already has a pending status to report, we | |
3674 | will still report it the next time we wait - see | |
3675 | status_pending_p_callback. */ | |
1a981360 PA |
3676 | |
3677 | /* If we already have a pending signal to report, then | |
3678 | there's no need to queue a SIGSTOP, as this means we're | |
3679 | midway through moving the LWP out of the jumppad, and we | |
3680 | will report the pending signal as soon as that is | |
3681 | finished. */ | |
3682 | if (lwp->pending_signals_to_report == NULL) | |
3683 | send_sigstop (lwp); | |
bd99dc85 | 3684 | } |
32ca6d61 | 3685 | |
bd99dc85 PA |
3686 | /* For stop requests, we're done. */ |
3687 | lwp->resume = NULL; | |
fc7238bb | 3688 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3689 | return 0; |
5544ad89 DJ |
3690 | } |
3691 | ||
bd99dc85 PA |
3692 | /* If this thread which is about to be resumed has a pending status, |
3693 | then don't resume any threads - we can just report the pending | |
3694 | status. Make sure to queue any signals that would otherwise be | |
3695 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3696 | thread has a pending status. If there's a thread that needs the |
3697 | step-over-breakpoint dance, then don't resume any other thread | |
3698 | but that particular one. */ | |
3699 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3700 | |
d50171e4 | 3701 | if (!leave_pending) |
bd99dc85 PA |
3702 | { |
3703 | if (debug_threads) | |
3704 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3705 | |
d50171e4 | 3706 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3707 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3708 | } |
3709 | else | |
3710 | { | |
3711 | if (debug_threads) | |
3712 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3713 | |
bd99dc85 PA |
3714 | /* If we have a new signal, enqueue the signal. */ |
3715 | if (lwp->resume->sig != 0) | |
3716 | { | |
3717 | struct pending_signals *p_sig; | |
3718 | p_sig = xmalloc (sizeof (*p_sig)); | |
3719 | p_sig->prev = lwp->pending_signals; | |
3720 | p_sig->signal = lwp->resume->sig; | |
3721 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3722 | ||
3723 | /* If this is the same signal we were previously stopped by, | |
3724 | make sure to queue its siginfo. We can ignore the return | |
3725 | value of ptrace; if it fails, we'll skip | |
3726 | PTRACE_SETSIGINFO. */ | |
3727 | if (WIFSTOPPED (lwp->last_status) | |
3728 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
3729 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
3730 | ||
3731 | lwp->pending_signals = p_sig; | |
3732 | } | |
3733 | } | |
5544ad89 | 3734 | |
fc7238bb | 3735 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3736 | lwp->resume = NULL; |
5544ad89 | 3737 | return 0; |
0d62e5e8 DJ |
3738 | } |
3739 | ||
3740 | static void | |
2bd7c093 | 3741 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3742 | { |
2bd7c093 | 3743 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3744 | struct lwp_info *need_step_over = NULL; |
3745 | int any_pending; | |
3746 | int leave_all_stopped; | |
c6ecbae5 | 3747 | |
2bd7c093 | 3748 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3749 | |
d50171e4 PA |
3750 | /* If there is a thread which would otherwise be resumed, which has |
3751 | a pending status, then don't resume any threads - we can just | |
3752 | report the pending status. Make sure to queue any signals that | |
3753 | would otherwise be sent. In non-stop mode, we'll apply this | |
3754 | logic to each thread individually. We consume all pending events | |
3755 | before considering to start a step-over (in all-stop). */ | |
3756 | any_pending = 0; | |
bd99dc85 | 3757 | if (!non_stop) |
d50171e4 PA |
3758 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3759 | ||
3760 | /* If there is a thread which would otherwise be resumed, which is | |
3761 | stopped at a breakpoint that needs stepping over, then don't | |
3762 | resume any threads - have it step over the breakpoint with all | |
3763 | other threads stopped, then resume all threads again. Make sure | |
3764 | to queue any signals that would otherwise be delivered or | |
3765 | queued. */ | |
3766 | if (!any_pending && supports_breakpoints ()) | |
3767 | need_step_over | |
3768 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3769 | need_step_over_p, NULL); | |
3770 | ||
3771 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3772 | ||
3773 | if (debug_threads) | |
3774 | { | |
3775 | if (need_step_over != NULL) | |
3776 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3777 | else if (any_pending) | |
3778 | fprintf (stderr, | |
3779 | "Not resuming, all-stop and found " | |
3780 | "an LWP with pending status\n"); | |
3781 | else | |
3782 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3783 | } | |
3784 | ||
3785 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3786 | otherwise deliver. */ | |
3787 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3788 | ||
3789 | if (need_step_over) | |
3790 | start_step_over (need_step_over); | |
3791 | } | |
3792 | ||
3793 | /* This function is called once per thread. We check the thread's | |
3794 | last resume request, which will tell us whether to resume, step, or | |
3795 | leave the thread stopped. Any signal the client requested to be | |
3796 | delivered has already been enqueued at this point. | |
3797 | ||
3798 | If any thread that GDB wants running is stopped at an internal | |
3799 | breakpoint that needs stepping over, we start a step-over operation | |
3800 | on that particular thread, and leave all others stopped. */ | |
3801 | ||
7984d532 PA |
3802 | static int |
3803 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3804 | { |
7984d532 | 3805 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3806 | struct thread_info *thread; |
d50171e4 PA |
3807 | int step; |
3808 | ||
7984d532 PA |
3809 | if (lwp == except) |
3810 | return 0; | |
d50171e4 PA |
3811 | |
3812 | if (debug_threads) | |
3813 | fprintf (stderr, | |
3814 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3815 | ||
3816 | if (!lwp->stopped) | |
3817 | { | |
3818 | if (debug_threads) | |
3819 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3820 | return 0; |
d50171e4 PA |
3821 | } |
3822 | ||
8336d594 PA |
3823 | thread = get_lwp_thread (lwp); |
3824 | ||
02fc4de7 PA |
3825 | if (thread->last_resume_kind == resume_stop |
3826 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3827 | { |
3828 | if (debug_threads) | |
02fc4de7 PA |
3829 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3830 | lwpid_of (lwp)); | |
7984d532 | 3831 | return 0; |
d50171e4 PA |
3832 | } |
3833 | ||
3834 | if (lwp->status_pending_p) | |
3835 | { | |
3836 | if (debug_threads) | |
3837 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3838 | lwpid_of (lwp)); | |
7984d532 | 3839 | return 0; |
d50171e4 PA |
3840 | } |
3841 | ||
7984d532 PA |
3842 | gdb_assert (lwp->suspended >= 0); |
3843 | ||
d50171e4 PA |
3844 | if (lwp->suspended) |
3845 | { | |
3846 | if (debug_threads) | |
3847 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3848 | return 0; |
d50171e4 PA |
3849 | } |
3850 | ||
1a981360 PA |
3851 | if (thread->last_resume_kind == resume_stop |
3852 | && lwp->pending_signals_to_report == NULL | |
3853 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3854 | { |
3855 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3856 | last_status.kind check above would catch it, and we wouldn't | |
3857 | reach here. This LWP may have been momentarily paused by a | |
3858 | stop_all_lwps call while handling for example, another LWP's | |
3859 | step-over. In that case, the pending expected SIGSTOP signal | |
3860 | that was queued at vCont;t handling time will have already | |
3861 | been consumed by wait_for_sigstop, and so we need to requeue | |
3862 | another one here. Note that if the LWP already has a SIGSTOP | |
3863 | pending, this is a no-op. */ | |
3864 | ||
3865 | if (debug_threads) | |
3866 | fprintf (stderr, | |
3867 | "Client wants LWP %ld to stop. " | |
3868 | "Making sure it has a SIGSTOP pending\n", | |
3869 | lwpid_of (lwp)); | |
3870 | ||
3871 | send_sigstop (lwp); | |
3872 | } | |
3873 | ||
8336d594 | 3874 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3875 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3876 | return 0; |
3877 | } | |
3878 | ||
3879 | static int | |
3880 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3881 | { | |
3882 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3883 | ||
3884 | if (lwp == except) | |
3885 | return 0; | |
3886 | ||
3887 | lwp->suspended--; | |
3888 | gdb_assert (lwp->suspended >= 0); | |
3889 | ||
3890 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3891 | } |
3892 | ||
3893 | /* When we finish a step-over, set threads running again. If there's | |
3894 | another thread that may need a step-over, now's the time to start | |
3895 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3896 | ||
3897 | static void | |
3898 | proceed_all_lwps (void) | |
3899 | { | |
3900 | struct lwp_info *need_step_over; | |
3901 | ||
3902 | /* If there is a thread which would otherwise be resumed, which is | |
3903 | stopped at a breakpoint that needs stepping over, then don't | |
3904 | resume any threads - have it step over the breakpoint with all | |
3905 | other threads stopped, then resume all threads again. */ | |
3906 | ||
3907 | if (supports_breakpoints ()) | |
3908 | { | |
3909 | need_step_over | |
3910 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3911 | need_step_over_p, NULL); | |
3912 | ||
3913 | if (need_step_over != NULL) | |
3914 | { | |
3915 | if (debug_threads) | |
3916 | fprintf (stderr, "proceed_all_lwps: found " | |
3917 | "thread %ld needing a step-over\n", | |
3918 | lwpid_of (need_step_over)); | |
3919 | ||
3920 | start_step_over (need_step_over); | |
3921 | return; | |
3922 | } | |
3923 | } | |
5544ad89 | 3924 | |
d50171e4 PA |
3925 | if (debug_threads) |
3926 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3927 | ||
7984d532 | 3928 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3929 | } |
3930 | ||
3931 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3932 | pending statuses, are set to run again, except for EXCEPT, if not | |
3933 | NULL. This undoes a stop_all_lwps call. */ | |
3934 | ||
3935 | static void | |
7984d532 | 3936 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3937 | { |
5544ad89 DJ |
3938 | if (debug_threads) |
3939 | { | |
d50171e4 PA |
3940 | if (except) |
3941 | fprintf (stderr, | |
3942 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3943 | else |
d50171e4 PA |
3944 | fprintf (stderr, |
3945 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3946 | } |
3947 | ||
7984d532 PA |
3948 | if (unsuspend) |
3949 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3950 | else | |
3951 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3952 | } |
3953 | ||
58caa3dc DJ |
3954 | |
3955 | #ifdef HAVE_LINUX_REGSETS | |
3956 | ||
1faeff08 MR |
3957 | #define use_linux_regsets 1 |
3958 | ||
58caa3dc | 3959 | static int |
442ea881 | 3960 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3961 | { |
3962 | struct regset_info *regset; | |
e9d25b98 | 3963 | int saw_general_regs = 0; |
95954743 | 3964 | int pid; |
1570b33e | 3965 | struct iovec iov; |
58caa3dc DJ |
3966 | |
3967 | regset = target_regsets; | |
3968 | ||
95954743 | 3969 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3970 | while (regset->size >= 0) |
3971 | { | |
1570b33e L |
3972 | void *buf, *data; |
3973 | int nt_type, res; | |
58caa3dc | 3974 | |
52fa2412 | 3975 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3976 | { |
3977 | regset ++; | |
3978 | continue; | |
3979 | } | |
3980 | ||
bca929d3 | 3981 | buf = xmalloc (regset->size); |
1570b33e L |
3982 | |
3983 | nt_type = regset->nt_type; | |
3984 | if (nt_type) | |
3985 | { | |
3986 | iov.iov_base = buf; | |
3987 | iov.iov_len = regset->size; | |
3988 | data = (void *) &iov; | |
3989 | } | |
3990 | else | |
3991 | data = buf; | |
3992 | ||
dfb64f85 | 3993 | #ifndef __sparc__ |
1570b33e | 3994 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3995 | #else |
1570b33e | 3996 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 3997 | #endif |
58caa3dc DJ |
3998 | if (res < 0) |
3999 | { | |
4000 | if (errno == EIO) | |
4001 | { | |
52fa2412 UW |
4002 | /* If we get EIO on a regset, do not try it again for |
4003 | this process. */ | |
4004 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 4005 | free (buf); |
52fa2412 | 4006 | continue; |
58caa3dc DJ |
4007 | } |
4008 | else | |
4009 | { | |
0d62e5e8 | 4010 | char s[256]; |
95954743 PA |
4011 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4012 | pid); | |
0d62e5e8 | 4013 | perror (s); |
58caa3dc DJ |
4014 | } |
4015 | } | |
e9d25b98 DJ |
4016 | else if (regset->type == GENERAL_REGS) |
4017 | saw_general_regs = 1; | |
442ea881 | 4018 | regset->store_function (regcache, buf); |
58caa3dc | 4019 | regset ++; |
fdeb2a12 | 4020 | free (buf); |
58caa3dc | 4021 | } |
e9d25b98 DJ |
4022 | if (saw_general_regs) |
4023 | return 0; | |
4024 | else | |
4025 | return 1; | |
58caa3dc DJ |
4026 | } |
4027 | ||
4028 | static int | |
442ea881 | 4029 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
4030 | { |
4031 | struct regset_info *regset; | |
e9d25b98 | 4032 | int saw_general_regs = 0; |
95954743 | 4033 | int pid; |
1570b33e | 4034 | struct iovec iov; |
58caa3dc DJ |
4035 | |
4036 | regset = target_regsets; | |
4037 | ||
95954743 | 4038 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4039 | while (regset->size >= 0) |
4040 | { | |
1570b33e L |
4041 | void *buf, *data; |
4042 | int nt_type, res; | |
58caa3dc | 4043 | |
52fa2412 | 4044 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
4045 | { |
4046 | regset ++; | |
4047 | continue; | |
4048 | } | |
4049 | ||
bca929d3 | 4050 | buf = xmalloc (regset->size); |
545587ee DJ |
4051 | |
4052 | /* First fill the buffer with the current register set contents, | |
4053 | in case there are any items in the kernel's regset that are | |
4054 | not in gdbserver's regcache. */ | |
1570b33e L |
4055 | |
4056 | nt_type = regset->nt_type; | |
4057 | if (nt_type) | |
4058 | { | |
4059 | iov.iov_base = buf; | |
4060 | iov.iov_len = regset->size; | |
4061 | data = (void *) &iov; | |
4062 | } | |
4063 | else | |
4064 | data = buf; | |
4065 | ||
dfb64f85 | 4066 | #ifndef __sparc__ |
1570b33e | 4067 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 4068 | #else |
689cc2ae | 4069 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4070 | #endif |
545587ee DJ |
4071 | |
4072 | if (res == 0) | |
4073 | { | |
4074 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4075 | regset->fill_function (regcache, buf); |
545587ee DJ |
4076 | |
4077 | /* Only now do we write the register set. */ | |
dfb64f85 | 4078 | #ifndef __sparc__ |
1570b33e | 4079 | res = ptrace (regset->set_request, pid, nt_type, data); |
dfb64f85 | 4080 | #else |
1570b33e | 4081 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4082 | #endif |
545587ee DJ |
4083 | } |
4084 | ||
58caa3dc DJ |
4085 | if (res < 0) |
4086 | { | |
4087 | if (errno == EIO) | |
4088 | { | |
52fa2412 UW |
4089 | /* If we get EIO on a regset, do not try it again for |
4090 | this process. */ | |
4091 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 4092 | free (buf); |
52fa2412 | 4093 | continue; |
58caa3dc | 4094 | } |
3221518c UW |
4095 | else if (errno == ESRCH) |
4096 | { | |
1b3f6016 PA |
4097 | /* At this point, ESRCH should mean the process is |
4098 | already gone, in which case we simply ignore attempts | |
4099 | to change its registers. See also the related | |
4100 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4101 | free (buf); |
3221518c UW |
4102 | return 0; |
4103 | } | |
58caa3dc DJ |
4104 | else |
4105 | { | |
ce3a066d | 4106 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4107 | } |
4108 | } | |
e9d25b98 DJ |
4109 | else if (regset->type == GENERAL_REGS) |
4110 | saw_general_regs = 1; | |
58caa3dc | 4111 | regset ++; |
09ec9b38 | 4112 | free (buf); |
58caa3dc | 4113 | } |
e9d25b98 DJ |
4114 | if (saw_general_regs) |
4115 | return 0; | |
4116 | else | |
4117 | return 1; | |
58caa3dc DJ |
4118 | } |
4119 | ||
1faeff08 | 4120 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4121 | |
1faeff08 MR |
4122 | #define use_linux_regsets 0 |
4123 | #define regsets_fetch_inferior_registers(regcache) 1 | |
4124 | #define regsets_store_inferior_registers(regcache) 1 | |
58caa3dc | 4125 | |
58caa3dc | 4126 | #endif |
1faeff08 MR |
4127 | |
4128 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4129 | calls or 0 if it has to be transferred individually. */ | |
4130 | ||
4131 | static int | |
4132 | linux_register_in_regsets (int regno) | |
4133 | { | |
4134 | unsigned char mask = 1 << (regno % 8); | |
4135 | size_t index = regno / 8; | |
4136 | ||
4137 | return (use_linux_regsets | |
4138 | && (the_low_target.regset_bitmap == NULL | |
4139 | || (the_low_target.regset_bitmap[index] & mask) != 0)); | |
4140 | } | |
4141 | ||
58caa3dc | 4142 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4143 | |
4144 | int | |
4145 | register_addr (int regnum) | |
4146 | { | |
4147 | int addr; | |
4148 | ||
4149 | if (regnum < 0 || regnum >= the_low_target.num_regs) | |
4150 | error ("Invalid register number %d.", regnum); | |
4151 | ||
4152 | addr = the_low_target.regmap[regnum]; | |
4153 | ||
4154 | return addr; | |
4155 | } | |
4156 | ||
4157 | /* Fetch one register. */ | |
4158 | static void | |
4159 | fetch_register (struct regcache *regcache, int regno) | |
4160 | { | |
4161 | CORE_ADDR regaddr; | |
4162 | int i, size; | |
4163 | char *buf; | |
4164 | int pid; | |
4165 | ||
4166 | if (regno >= the_low_target.num_regs) | |
4167 | return; | |
4168 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4169 | return; | |
4170 | ||
4171 | regaddr = register_addr (regno); | |
4172 | if (regaddr == -1) | |
4173 | return; | |
4174 | ||
4175 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4176 | & -sizeof (PTRACE_XFER_TYPE)); | |
4177 | buf = alloca (size); | |
4178 | ||
4179 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4180 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4181 | { | |
4182 | errno = 0; | |
4183 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4184 | ptrace (PTRACE_PEEKUSER, pid, | |
4185 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4186 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
4187 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
4188 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4189 | if (errno != 0) | |
4190 | error ("reading register %d: %s", regno, strerror (errno)); | |
4191 | } | |
4192 | ||
4193 | if (the_low_target.supply_ptrace_register) | |
4194 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4195 | else | |
4196 | supply_register (regcache, regno, buf); | |
4197 | } | |
4198 | ||
4199 | /* Store one register. */ | |
4200 | static void | |
4201 | store_register (struct regcache *regcache, int regno) | |
4202 | { | |
4203 | CORE_ADDR regaddr; | |
4204 | int i, size; | |
4205 | char *buf; | |
4206 | int pid; | |
4207 | ||
4208 | if (regno >= the_low_target.num_regs) | |
4209 | return; | |
4210 | if ((*the_low_target.cannot_store_register) (regno)) | |
4211 | return; | |
4212 | ||
4213 | regaddr = register_addr (regno); | |
4214 | if (regaddr == -1) | |
4215 | return; | |
4216 | ||
4217 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4218 | & -sizeof (PTRACE_XFER_TYPE)); | |
4219 | buf = alloca (size); | |
4220 | memset (buf, 0, size); | |
4221 | ||
4222 | if (the_low_target.collect_ptrace_register) | |
4223 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4224 | else | |
4225 | collect_register (regcache, regno, buf); | |
4226 | ||
4227 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4228 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4229 | { | |
4230 | errno = 0; | |
4231 | ptrace (PTRACE_POKEUSER, pid, | |
4232 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4233 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4234 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
4235 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
4236 | if (errno != 0) | |
4237 | { | |
4238 | /* At this point, ESRCH should mean the process is | |
4239 | already gone, in which case we simply ignore attempts | |
4240 | to change its registers. See also the related | |
4241 | comment in linux_resume_one_lwp. */ | |
4242 | if (errno == ESRCH) | |
4243 | return; | |
4244 | ||
4245 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4246 | error ("writing register %d: %s", regno, strerror (errno)); | |
4247 | } | |
4248 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4249 | } | |
4250 | } | |
4251 | ||
4252 | /* Fetch all registers, or just one, from the child process. | |
4253 | If REGNO is -1, do this for all registers, skipping any that are | |
4254 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4255 | unless ALL is non-zero. | |
4256 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4257 | static void | |
4258 | usr_fetch_inferior_registers (struct regcache *regcache, int regno, int all) | |
4259 | { | |
4260 | if (regno == -1) | |
4261 | { | |
4262 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4263 | if (all || !linux_register_in_regsets (regno)) | |
4264 | fetch_register (regcache, regno); | |
4265 | } | |
4266 | else | |
4267 | fetch_register (regcache, regno); | |
4268 | } | |
4269 | ||
4270 | /* Store our register values back into the inferior. | |
4271 | If REGNO is -1, do this for all registers, skipping any that are | |
4272 | assumed to have been saved by regsets_store_inferior_registers, | |
4273 | unless ALL is non-zero. | |
4274 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4275 | static void | |
4276 | usr_store_inferior_registers (struct regcache *regcache, int regno, int all) | |
4277 | { | |
4278 | if (regno == -1) | |
4279 | { | |
4280 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4281 | if (all || !linux_register_in_regsets (regno)) | |
4282 | store_register (regcache, regno); | |
4283 | } | |
4284 | else | |
4285 | store_register (regcache, regno); | |
4286 | } | |
4287 | ||
4288 | #else /* !HAVE_LINUX_USRREGS */ | |
4289 | ||
4290 | #define usr_fetch_inferior_registers(regcache, regno, all) do {} while (0) | |
4291 | #define usr_store_inferior_registers(regcache, regno, all) do {} while (0) | |
4292 | ||
58caa3dc | 4293 | #endif |
1faeff08 MR |
4294 | |
4295 | ||
4296 | void | |
4297 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4298 | { | |
4299 | int use_regsets; | |
4300 | int all = 0; | |
4301 | ||
4302 | if (regno == -1) | |
4303 | { | |
c14dfd32 PA |
4304 | if (the_low_target.fetch_register != NULL) |
4305 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4306 | (*the_low_target.fetch_register) (regcache, regno); | |
4307 | ||
1faeff08 | 4308 | all = regsets_fetch_inferior_registers (regcache); |
c14dfd32 | 4309 | usr_fetch_inferior_registers (regcache, -1, all); |
1faeff08 MR |
4310 | } |
4311 | else | |
4312 | { | |
c14dfd32 PA |
4313 | if (the_low_target.fetch_register != NULL |
4314 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4315 | return; | |
4316 | ||
1faeff08 MR |
4317 | use_regsets = linux_register_in_regsets (regno); |
4318 | if (use_regsets) | |
4319 | all = regsets_fetch_inferior_registers (regcache); | |
4320 | if (!use_regsets || all) | |
4321 | usr_fetch_inferior_registers (regcache, regno, 1); | |
4322 | } | |
58caa3dc DJ |
4323 | } |
4324 | ||
4325 | void | |
442ea881 | 4326 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4327 | { |
1faeff08 MR |
4328 | int use_regsets; |
4329 | int all = 0; | |
4330 | ||
4331 | if (regno == -1) | |
4332 | { | |
4333 | all = regsets_store_inferior_registers (regcache); | |
4334 | usr_store_inferior_registers (regcache, regno, all); | |
4335 | } | |
4336 | else | |
4337 | { | |
4338 | use_regsets = linux_register_in_regsets (regno); | |
4339 | if (use_regsets) | |
4340 | all = regsets_store_inferior_registers (regcache); | |
4341 | if (!use_regsets || all) | |
4342 | usr_store_inferior_registers (regcache, regno, 1); | |
4343 | } | |
58caa3dc DJ |
4344 | } |
4345 | ||
da6d8c04 | 4346 | |
da6d8c04 DJ |
4347 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4348 | to debugger memory starting at MYADDR. */ | |
4349 | ||
c3e735a6 | 4350 | static int |
f450004a | 4351 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
4352 | { |
4353 | register int i; | |
4354 | /* Round starting address down to longword boundary. */ | |
4355 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4356 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
4357 | register int count |
4358 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
4359 | / sizeof (PTRACE_XFER_TYPE); |
4360 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 4361 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 4362 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
4363 | int fd; |
4364 | char filename[64]; | |
95954743 | 4365 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
4366 | |
4367 | /* Try using /proc. Don't bother for one word. */ | |
4368 | if (len >= 3 * sizeof (long)) | |
4369 | { | |
4370 | /* We could keep this file open and cache it - possibly one per | |
4371 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4372 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4373 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4374 | if (fd == -1) | |
4375 | goto no_proc; | |
4376 | ||
4377 | /* If pread64 is available, use it. It's faster if the kernel | |
4378 | supports it (only one syscall), and it's 64-bit safe even on | |
4379 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4380 | application). */ | |
4381 | #ifdef HAVE_PREAD64 | |
4382 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
4383 | #else | |
1de1badb | 4384 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
4385 | #endif |
4386 | { | |
4387 | close (fd); | |
4388 | goto no_proc; | |
4389 | } | |
4390 | ||
4391 | close (fd); | |
4392 | return 0; | |
4393 | } | |
da6d8c04 | 4394 | |
fd462a61 | 4395 | no_proc: |
da6d8c04 DJ |
4396 | /* Read all the longwords */ |
4397 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4398 | { | |
c3e735a6 | 4399 | errno = 0; |
14ce3065 DE |
4400 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4401 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4402 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
4403 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
4404 | if (errno) |
4405 | return errno; | |
da6d8c04 DJ |
4406 | } |
4407 | ||
4408 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
4409 | memcpy (myaddr, |
4410 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4411 | len); | |
c3e735a6 DJ |
4412 | |
4413 | return 0; | |
da6d8c04 DJ |
4414 | } |
4415 | ||
93ae6fdc PA |
4416 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4417 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
4418 | returns the value of errno. */ |
4419 | ||
ce3a066d | 4420 | static int |
f450004a | 4421 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4422 | { |
4423 | register int i; | |
4424 | /* Round starting address down to longword boundary. */ | |
4425 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4426 | /* Round ending address up; get number of longwords that makes. */ | |
4427 | register int count | |
493e2a69 MS |
4428 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4429 | / sizeof (PTRACE_XFER_TYPE); | |
4430 | ||
da6d8c04 | 4431 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4432 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4433 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4434 | ||
95954743 | 4435 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4436 | |
0d62e5e8 DJ |
4437 | if (debug_threads) |
4438 | { | |
58d6951d DJ |
4439 | /* Dump up to four bytes. */ |
4440 | unsigned int val = * (unsigned int *) myaddr; | |
4441 | if (len == 1) | |
4442 | val = val & 0xff; | |
4443 | else if (len == 2) | |
4444 | val = val & 0xffff; | |
4445 | else if (len == 3) | |
4446 | val = val & 0xffffff; | |
4447 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4448 | val, (long)memaddr); | |
0d62e5e8 DJ |
4449 | } |
4450 | ||
da6d8c04 DJ |
4451 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4452 | ||
93ae6fdc | 4453 | errno = 0; |
14ce3065 DE |
4454 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4455 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4456 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
4457 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
4458 | if (errno) |
4459 | return errno; | |
da6d8c04 DJ |
4460 | |
4461 | if (count > 1) | |
4462 | { | |
93ae6fdc | 4463 | errno = 0; |
da6d8c04 | 4464 | buffer[count - 1] |
95954743 | 4465 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4466 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4467 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4468 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4469 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 4470 | 0); |
93ae6fdc PA |
4471 | if (errno) |
4472 | return errno; | |
da6d8c04 DJ |
4473 | } |
4474 | ||
93ae6fdc | 4475 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4476 | |
493e2a69 MS |
4477 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4478 | myaddr, len); | |
da6d8c04 DJ |
4479 | |
4480 | /* Write the entire buffer. */ | |
4481 | ||
4482 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4483 | { | |
4484 | errno = 0; | |
14ce3065 DE |
4485 | ptrace (PTRACE_POKETEXT, pid, |
4486 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4487 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4488 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4489 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4490 | if (errno) |
4491 | return errno; | |
4492 | } | |
4493 | ||
4494 | return 0; | |
4495 | } | |
2f2893d9 | 4496 | |
6076632b | 4497 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4498 | static int linux_supports_tracefork_flag; |
4499 | ||
1e7fc18c PA |
4500 | static void |
4501 | linux_enable_event_reporting (int pid) | |
4502 | { | |
4503 | if (!linux_supports_tracefork_flag) | |
4504 | return; | |
4505 | ||
4506 | ptrace (PTRACE_SETOPTIONS, pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
4507 | } | |
4508 | ||
51c2684e | 4509 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4510 | |
51c2684e DJ |
4511 | static int |
4512 | linux_tracefork_grandchild (void *arg) | |
4513 | { | |
4514 | _exit (0); | |
4515 | } | |
4516 | ||
7407e2de AS |
4517 | #define STACK_SIZE 4096 |
4518 | ||
51c2684e DJ |
4519 | static int |
4520 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
4521 | { |
4522 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
4523 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
4524 | |
4525 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4526 | ||
4527 | if (fork () == 0) | |
4528 | linux_tracefork_grandchild (NULL); | |
4529 | ||
4530 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4531 | ||
7407e2de AS |
4532 | #ifdef __ia64__ |
4533 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4534 | CLONE_VM | SIGCHLD, NULL); | |
4535 | #else | |
a1f2ce7d | 4536 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4537 | CLONE_VM | SIGCHLD, NULL); |
4538 | #endif | |
e4b7f41c JK |
4539 | |
4540 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4541 | ||
24a09b5f DJ |
4542 | _exit (0); |
4543 | } | |
4544 | ||
24a09b5f DJ |
4545 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4546 | sure that we can enable the option, and that it had the desired | |
4547 | effect. */ | |
4548 | ||
4549 | static void | |
4550 | linux_test_for_tracefork (void) | |
4551 | { | |
4552 | int child_pid, ret, status; | |
4553 | long second_pid; | |
e4b7f41c | 4554 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4555 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4556 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4557 | |
4558 | linux_supports_tracefork_flag = 0; | |
4559 | ||
e4b7f41c JK |
4560 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4561 | ||
4562 | child_pid = fork (); | |
4563 | if (child_pid == 0) | |
4564 | linux_tracefork_child (NULL); | |
4565 | ||
4566 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4567 | ||
51c2684e | 4568 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4569 | #ifdef __ia64__ |
4570 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4571 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4572 | #else /* !__ia64__ */ |
7407e2de AS |
4573 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4574 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4575 | #endif /* !__ia64__ */ |
4576 | ||
4577 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4578 | ||
24a09b5f | 4579 | if (child_pid == -1) |
51c2684e | 4580 | perror_with_name ("clone"); |
24a09b5f DJ |
4581 | |
4582 | ret = my_waitpid (child_pid, &status, 0); | |
4583 | if (ret == -1) | |
4584 | perror_with_name ("waitpid"); | |
4585 | else if (ret != child_pid) | |
4586 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4587 | if (! WIFSTOPPED (status)) | |
4588 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4589 | ||
14ce3065 DE |
4590 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
4591 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
4592 | if (ret != 0) |
4593 | { | |
4594 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4595 | if (ret != 0) | |
4596 | { | |
4597 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4598 | return; | |
4599 | } | |
4600 | ||
4601 | ret = my_waitpid (child_pid, &status, 0); | |
4602 | if (ret != child_pid) | |
4603 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4604 | else if (!WIFSIGNALED (status)) | |
4605 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4606 | "killed child", status); | |
4607 | ||
4608 | return; | |
4609 | } | |
4610 | ||
4611 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
4612 | if (ret != 0) | |
4613 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4614 | ||
4615 | ret = my_waitpid (child_pid, &status, 0); | |
4616 | ||
4617 | if (ret == child_pid && WIFSTOPPED (status) | |
4618 | && status >> 16 == PTRACE_EVENT_FORK) | |
4619 | { | |
4620 | second_pid = 0; | |
4621 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
4622 | if (ret == 0 && second_pid != 0) | |
4623 | { | |
4624 | int second_status; | |
4625 | ||
4626 | linux_supports_tracefork_flag = 1; | |
4627 | my_waitpid (second_pid, &second_status, 0); | |
4628 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
4629 | if (ret != 0) | |
4630 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4631 | my_waitpid (second_pid, &status, 0); | |
4632 | } | |
4633 | } | |
4634 | else | |
4635 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4636 | "(%d, status 0x%x)", ret, status); | |
4637 | ||
4638 | do | |
4639 | { | |
4640 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4641 | if (ret != 0) | |
4642 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4643 | my_waitpid (child_pid, &status, 0); | |
4644 | } | |
4645 | while (WIFSTOPPED (status)); | |
51c2684e | 4646 | |
e4b7f41c | 4647 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4648 | free (stack); |
e4b7f41c | 4649 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4650 | } |
4651 | ||
4652 | ||
2f2893d9 DJ |
4653 | static void |
4654 | linux_look_up_symbols (void) | |
4655 | { | |
0d62e5e8 | 4656 | #ifdef USE_THREAD_DB |
95954743 PA |
4657 | struct process_info *proc = current_process (); |
4658 | ||
cdbfd419 | 4659 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4660 | return; |
4661 | ||
6076632b DE |
4662 | /* If the kernel supports tracing forks then it also supports tracing |
4663 | clones, and then we don't need to use the magic thread event breakpoint | |
4664 | to learn about threads. */ | |
cdbfd419 | 4665 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4666 | #endif |
4667 | } | |
4668 | ||
e5379b03 | 4669 | static void |
ef57601b | 4670 | linux_request_interrupt (void) |
e5379b03 | 4671 | { |
a1928bad | 4672 | extern unsigned long signal_pid; |
e5379b03 | 4673 | |
95954743 PA |
4674 | if (!ptid_equal (cont_thread, null_ptid) |
4675 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4676 | { |
54a0b537 | 4677 | struct lwp_info *lwp; |
bd99dc85 | 4678 | int lwpid; |
e5379b03 | 4679 | |
54a0b537 | 4680 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4681 | lwpid = lwpid_of (lwp); |
4682 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4683 | } |
4684 | else | |
ef57601b | 4685 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4686 | } |
4687 | ||
aa691b87 RM |
4688 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4689 | to debugger memory starting at MYADDR. */ | |
4690 | ||
4691 | static int | |
f450004a | 4692 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4693 | { |
4694 | char filename[PATH_MAX]; | |
4695 | int fd, n; | |
95954743 | 4696 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4697 | |
6cebaf6e | 4698 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4699 | |
4700 | fd = open (filename, O_RDONLY); | |
4701 | if (fd < 0) | |
4702 | return -1; | |
4703 | ||
4704 | if (offset != (CORE_ADDR) 0 | |
4705 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4706 | n = -1; | |
4707 | else | |
4708 | n = read (fd, myaddr, len); | |
4709 | ||
4710 | close (fd); | |
4711 | ||
4712 | return n; | |
4713 | } | |
4714 | ||
d993e290 PA |
4715 | /* These breakpoint and watchpoint related wrapper functions simply |
4716 | pass on the function call if the target has registered a | |
4717 | corresponding function. */ | |
e013ee27 OF |
4718 | |
4719 | static int | |
d993e290 | 4720 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4721 | { |
d993e290 PA |
4722 | if (the_low_target.insert_point != NULL) |
4723 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4724 | else |
4725 | /* Unsupported (see target.h). */ | |
4726 | return 1; | |
4727 | } | |
4728 | ||
4729 | static int | |
d993e290 | 4730 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4731 | { |
d993e290 PA |
4732 | if (the_low_target.remove_point != NULL) |
4733 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4734 | else |
4735 | /* Unsupported (see target.h). */ | |
4736 | return 1; | |
4737 | } | |
4738 | ||
4739 | static int | |
4740 | linux_stopped_by_watchpoint (void) | |
4741 | { | |
c3adc08c PA |
4742 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4743 | ||
4744 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4745 | } |
4746 | ||
4747 | static CORE_ADDR | |
4748 | linux_stopped_data_address (void) | |
4749 | { | |
c3adc08c PA |
4750 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4751 | ||
4752 | return lwp->stopped_data_address; | |
e013ee27 OF |
4753 | } |
4754 | ||
42c81e2a | 4755 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
4756 | #if defined(__mcoldfire__) |
4757 | /* These should really be defined in the kernel's ptrace.h header. */ | |
4758 | #define PT_TEXT_ADDR 49*4 | |
4759 | #define PT_DATA_ADDR 50*4 | |
4760 | #define PT_TEXT_END_ADDR 51*4 | |
eb826dc6 MF |
4761 | #elif defined(BFIN) |
4762 | #define PT_TEXT_ADDR 220 | |
4763 | #define PT_TEXT_END_ADDR 224 | |
4764 | #define PT_DATA_ADDR 228 | |
58dbd541 YQ |
4765 | #elif defined(__TMS320C6X__) |
4766 | #define PT_TEXT_ADDR (0x10000*4) | |
4767 | #define PT_DATA_ADDR (0x10004*4) | |
4768 | #define PT_TEXT_END_ADDR (0x10008*4) | |
52fb6437 NS |
4769 | #endif |
4770 | ||
4771 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4772 | to tell gdb about. */ | |
4773 | ||
4774 | static int | |
4775 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4776 | { | |
4777 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
4778 | unsigned long text, text_end, data; | |
bd99dc85 | 4779 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4780 | |
4781 | errno = 0; | |
4782 | ||
4783 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
4784 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
4785 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
4786 | ||
4787 | if (errno == 0) | |
4788 | { | |
4789 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4790 | used by gdb) are relative to the beginning of the program, |
4791 | with the data segment immediately following the text segment. | |
4792 | However, the actual runtime layout in memory may put the data | |
4793 | somewhere else, so when we send gdb a data base-address, we | |
4794 | use the real data base address and subtract the compile-time | |
4795 | data base-address from it (which is just the length of the | |
4796 | text segment). BSS immediately follows data in both | |
4797 | cases. */ | |
52fb6437 NS |
4798 | *text_p = text; |
4799 | *data_p = data - (text_end - text); | |
1b3f6016 | 4800 | |
52fb6437 NS |
4801 | return 1; |
4802 | } | |
4803 | #endif | |
4804 | return 0; | |
4805 | } | |
4806 | #endif | |
4807 | ||
07e059b5 VP |
4808 | static int |
4809 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4810 | unsigned char *readbuf, unsigned const char *writebuf, |
4811 | CORE_ADDR offset, int len) | |
07e059b5 | 4812 | { |
d26e3629 | 4813 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4814 | } |
4815 | ||
d0722149 DE |
4816 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4817 | layout of the inferiors' architecture. */ | |
4818 | ||
4819 | static void | |
a5362b9a | 4820 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4821 | { |
4822 | int done = 0; | |
4823 | ||
4824 | if (the_low_target.siginfo_fixup != NULL) | |
4825 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4826 | ||
4827 | /* If there was no callback, or the callback didn't do anything, | |
4828 | then just do a straight memcpy. */ | |
4829 | if (!done) | |
4830 | { | |
4831 | if (direction == 1) | |
a5362b9a | 4832 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4833 | else |
a5362b9a | 4834 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
4835 | } |
4836 | } | |
4837 | ||
4aa995e1 PA |
4838 | static int |
4839 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4840 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4841 | { | |
d0722149 | 4842 | int pid; |
a5362b9a TS |
4843 | siginfo_t siginfo; |
4844 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
4845 | |
4846 | if (current_inferior == NULL) | |
4847 | return -1; | |
4848 | ||
bd99dc85 | 4849 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4850 | |
4851 | if (debug_threads) | |
d0722149 | 4852 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4853 | readbuf != NULL ? "Reading" : "Writing", |
4854 | pid); | |
4855 | ||
0adea5f7 | 4856 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4857 | return -1; |
4858 | ||
4859 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
4860 | return -1; | |
4861 | ||
d0722149 DE |
4862 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4863 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4864 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4865 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4866 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4867 | ||
4aa995e1 PA |
4868 | if (offset + len > sizeof (siginfo)) |
4869 | len = sizeof (siginfo) - offset; | |
4870 | ||
4871 | if (readbuf != NULL) | |
d0722149 | 4872 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4873 | else |
4874 | { | |
d0722149 DE |
4875 | memcpy (inf_siginfo + offset, writebuf, len); |
4876 | ||
4877 | /* Convert back to ptrace layout before flushing it out. */ | |
4878 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4879 | ||
4aa995e1 PA |
4880 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
4881 | return -1; | |
4882 | } | |
4883 | ||
4884 | return len; | |
4885 | } | |
4886 | ||
bd99dc85 PA |
4887 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4888 | so we notice when children change state; as the handler for the | |
4889 | sigsuspend in my_waitpid. */ | |
4890 | ||
4891 | static void | |
4892 | sigchld_handler (int signo) | |
4893 | { | |
4894 | int old_errno = errno; | |
4895 | ||
4896 | if (debug_threads) | |
e581f2b4 PA |
4897 | { |
4898 | do | |
4899 | { | |
4900 | /* fprintf is not async-signal-safe, so call write | |
4901 | directly. */ | |
4902 | if (write (2, "sigchld_handler\n", | |
4903 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4904 | break; /* just ignore */ | |
4905 | } while (0); | |
4906 | } | |
bd99dc85 PA |
4907 | |
4908 | if (target_is_async_p ()) | |
4909 | async_file_mark (); /* trigger a linux_wait */ | |
4910 | ||
4911 | errno = old_errno; | |
4912 | } | |
4913 | ||
4914 | static int | |
4915 | linux_supports_non_stop (void) | |
4916 | { | |
4917 | return 1; | |
4918 | } | |
4919 | ||
4920 | static int | |
4921 | linux_async (int enable) | |
4922 | { | |
4923 | int previous = (linux_event_pipe[0] != -1); | |
4924 | ||
8336d594 PA |
4925 | if (debug_threads) |
4926 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4927 | enable, previous); | |
4928 | ||
bd99dc85 PA |
4929 | if (previous != enable) |
4930 | { | |
4931 | sigset_t mask; | |
4932 | sigemptyset (&mask); | |
4933 | sigaddset (&mask, SIGCHLD); | |
4934 | ||
4935 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4936 | ||
4937 | if (enable) | |
4938 | { | |
4939 | if (pipe (linux_event_pipe) == -1) | |
4940 | fatal ("creating event pipe failed."); | |
4941 | ||
4942 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4943 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4944 | ||
4945 | /* Register the event loop handler. */ | |
4946 | add_file_handler (linux_event_pipe[0], | |
4947 | handle_target_event, NULL); | |
4948 | ||
4949 | /* Always trigger a linux_wait. */ | |
4950 | async_file_mark (); | |
4951 | } | |
4952 | else | |
4953 | { | |
4954 | delete_file_handler (linux_event_pipe[0]); | |
4955 | ||
4956 | close (linux_event_pipe[0]); | |
4957 | close (linux_event_pipe[1]); | |
4958 | linux_event_pipe[0] = -1; | |
4959 | linux_event_pipe[1] = -1; | |
4960 | } | |
4961 | ||
4962 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4963 | } | |
4964 | ||
4965 | return previous; | |
4966 | } | |
4967 | ||
4968 | static int | |
4969 | linux_start_non_stop (int nonstop) | |
4970 | { | |
4971 | /* Register or unregister from event-loop accordingly. */ | |
4972 | linux_async (nonstop); | |
4973 | return 0; | |
4974 | } | |
4975 | ||
cf8fd78b PA |
4976 | static int |
4977 | linux_supports_multi_process (void) | |
4978 | { | |
4979 | return 1; | |
4980 | } | |
4981 | ||
03583c20 UW |
4982 | static int |
4983 | linux_supports_disable_randomization (void) | |
4984 | { | |
4985 | #ifdef HAVE_PERSONALITY | |
4986 | return 1; | |
4987 | #else | |
4988 | return 0; | |
4989 | #endif | |
4990 | } | |
efcbbd14 | 4991 | |
d1feda86 YQ |
4992 | static int |
4993 | linux_supports_agent (void) | |
4994 | { | |
4995 | return 1; | |
4996 | } | |
4997 | ||
efcbbd14 UW |
4998 | /* Enumerate spufs IDs for process PID. */ |
4999 | static int | |
5000 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5001 | { | |
5002 | int pos = 0; | |
5003 | int written = 0; | |
5004 | char path[128]; | |
5005 | DIR *dir; | |
5006 | struct dirent *entry; | |
5007 | ||
5008 | sprintf (path, "/proc/%ld/fd", pid); | |
5009 | dir = opendir (path); | |
5010 | if (!dir) | |
5011 | return -1; | |
5012 | ||
5013 | rewinddir (dir); | |
5014 | while ((entry = readdir (dir)) != NULL) | |
5015 | { | |
5016 | struct stat st; | |
5017 | struct statfs stfs; | |
5018 | int fd; | |
5019 | ||
5020 | fd = atoi (entry->d_name); | |
5021 | if (!fd) | |
5022 | continue; | |
5023 | ||
5024 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5025 | if (stat (path, &st) != 0) | |
5026 | continue; | |
5027 | if (!S_ISDIR (st.st_mode)) | |
5028 | continue; | |
5029 | ||
5030 | if (statfs (path, &stfs) != 0) | |
5031 | continue; | |
5032 | if (stfs.f_type != SPUFS_MAGIC) | |
5033 | continue; | |
5034 | ||
5035 | if (pos >= offset && pos + 4 <= offset + len) | |
5036 | { | |
5037 | *(unsigned int *)(buf + pos - offset) = fd; | |
5038 | written += 4; | |
5039 | } | |
5040 | pos += 4; | |
5041 | } | |
5042 | ||
5043 | closedir (dir); | |
5044 | return written; | |
5045 | } | |
5046 | ||
5047 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5048 | object type, using the /proc file system. */ | |
5049 | static int | |
5050 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5051 | unsigned const char *writebuf, | |
5052 | CORE_ADDR offset, int len) | |
5053 | { | |
5054 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5055 | char buf[128]; | |
5056 | int fd = 0; | |
5057 | int ret = 0; | |
5058 | ||
5059 | if (!writebuf && !readbuf) | |
5060 | return -1; | |
5061 | ||
5062 | if (!*annex) | |
5063 | { | |
5064 | if (!readbuf) | |
5065 | return -1; | |
5066 | else | |
5067 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5068 | } | |
5069 | ||
5070 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5071 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5072 | if (fd <= 0) | |
5073 | return -1; | |
5074 | ||
5075 | if (offset != 0 | |
5076 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5077 | { | |
5078 | close (fd); | |
5079 | return 0; | |
5080 | } | |
5081 | ||
5082 | if (writebuf) | |
5083 | ret = write (fd, writebuf, (size_t) len); | |
5084 | else | |
5085 | ret = read (fd, readbuf, (size_t) len); | |
5086 | ||
5087 | close (fd); | |
5088 | return ret; | |
5089 | } | |
5090 | ||
723b724b | 5091 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5092 | struct target_loadseg |
5093 | { | |
5094 | /* Core address to which the segment is mapped. */ | |
5095 | Elf32_Addr addr; | |
5096 | /* VMA recorded in the program header. */ | |
5097 | Elf32_Addr p_vaddr; | |
5098 | /* Size of this segment in memory. */ | |
5099 | Elf32_Word p_memsz; | |
5100 | }; | |
5101 | ||
723b724b | 5102 | # if defined PT_GETDSBT |
78d85199 YQ |
5103 | struct target_loadmap |
5104 | { | |
5105 | /* Protocol version number, must be zero. */ | |
5106 | Elf32_Word version; | |
5107 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5108 | unsigned *dsbt_table; | |
5109 | unsigned dsbt_size, dsbt_index; | |
5110 | /* Number of segments in this map. */ | |
5111 | Elf32_Word nsegs; | |
5112 | /* The actual memory map. */ | |
5113 | struct target_loadseg segs[/*nsegs*/]; | |
5114 | }; | |
723b724b MF |
5115 | # define LINUX_LOADMAP PT_GETDSBT |
5116 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5117 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5118 | # else | |
5119 | struct target_loadmap | |
5120 | { | |
5121 | /* Protocol version number, must be zero. */ | |
5122 | Elf32_Half version; | |
5123 | /* Number of segments in this map. */ | |
5124 | Elf32_Half nsegs; | |
5125 | /* The actual memory map. */ | |
5126 | struct target_loadseg segs[/*nsegs*/]; | |
5127 | }; | |
5128 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5129 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5130 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5131 | # endif | |
78d85199 | 5132 | |
78d85199 YQ |
5133 | static int |
5134 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5135 | unsigned char *myaddr, unsigned int len) | |
5136 | { | |
5137 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5138 | int addr = -1; | |
5139 | struct target_loadmap *data = NULL; | |
5140 | unsigned int actual_length, copy_length; | |
5141 | ||
5142 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5143 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5144 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5145 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5146 | else |
5147 | return -1; | |
5148 | ||
723b724b | 5149 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5150 | return -1; |
5151 | ||
5152 | if (data == NULL) | |
5153 | return -1; | |
5154 | ||
5155 | actual_length = sizeof (struct target_loadmap) | |
5156 | + sizeof (struct target_loadseg) * data->nsegs; | |
5157 | ||
5158 | if (offset < 0 || offset > actual_length) | |
5159 | return -1; | |
5160 | ||
5161 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5162 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5163 | return copy_length; | |
5164 | } | |
723b724b MF |
5165 | #else |
5166 | # define linux_read_loadmap NULL | |
5167 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5168 | |
1570b33e L |
5169 | static void |
5170 | linux_process_qsupported (const char *query) | |
5171 | { | |
5172 | if (the_low_target.process_qsupported != NULL) | |
5173 | the_low_target.process_qsupported (query); | |
5174 | } | |
5175 | ||
219f2f23 PA |
5176 | static int |
5177 | linux_supports_tracepoints (void) | |
5178 | { | |
5179 | if (*the_low_target.supports_tracepoints == NULL) | |
5180 | return 0; | |
5181 | ||
5182 | return (*the_low_target.supports_tracepoints) (); | |
5183 | } | |
5184 | ||
5185 | static CORE_ADDR | |
5186 | linux_read_pc (struct regcache *regcache) | |
5187 | { | |
5188 | if (the_low_target.get_pc == NULL) | |
5189 | return 0; | |
5190 | ||
5191 | return (*the_low_target.get_pc) (regcache); | |
5192 | } | |
5193 | ||
5194 | static void | |
5195 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5196 | { | |
5197 | gdb_assert (the_low_target.set_pc != NULL); | |
5198 | ||
5199 | (*the_low_target.set_pc) (regcache, pc); | |
5200 | } | |
5201 | ||
8336d594 PA |
5202 | static int |
5203 | linux_thread_stopped (struct thread_info *thread) | |
5204 | { | |
5205 | return get_thread_lwp (thread)->stopped; | |
5206 | } | |
5207 | ||
5208 | /* This exposes stop-all-threads functionality to other modules. */ | |
5209 | ||
5210 | static void | |
7984d532 | 5211 | linux_pause_all (int freeze) |
8336d594 | 5212 | { |
7984d532 PA |
5213 | stop_all_lwps (freeze, NULL); |
5214 | } | |
5215 | ||
5216 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5217 | modules. */ | |
5218 | ||
5219 | static void | |
5220 | linux_unpause_all (int unfreeze) | |
5221 | { | |
5222 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5223 | } |
5224 | ||
90d74c30 PA |
5225 | static int |
5226 | linux_prepare_to_access_memory (void) | |
5227 | { | |
5228 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5229 | running LWP. */ | |
5230 | if (non_stop) | |
5231 | linux_pause_all (1); | |
5232 | return 0; | |
5233 | } | |
5234 | ||
5235 | static void | |
0146f85b | 5236 | linux_done_accessing_memory (void) |
90d74c30 PA |
5237 | { |
5238 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5239 | running LWP. */ | |
5240 | if (non_stop) | |
5241 | linux_unpause_all (1); | |
5242 | } | |
5243 | ||
fa593d66 PA |
5244 | static int |
5245 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5246 | CORE_ADDR collector, | |
5247 | CORE_ADDR lockaddr, | |
5248 | ULONGEST orig_size, | |
5249 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5250 | CORE_ADDR *trampoline, |
5251 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5252 | unsigned char *jjump_pad_insn, |
5253 | ULONGEST *jjump_pad_insn_size, | |
5254 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5255 | CORE_ADDR *adjusted_insn_addr_end, |
5256 | char *err) | |
fa593d66 PA |
5257 | { |
5258 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5259 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5260 | jump_entry, trampoline, trampoline_size, |
5261 | jjump_pad_insn, jjump_pad_insn_size, | |
5262 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5263 | err); | |
fa593d66 PA |
5264 | } |
5265 | ||
6a271cae PA |
5266 | static struct emit_ops * |
5267 | linux_emit_ops (void) | |
5268 | { | |
5269 | if (the_low_target.emit_ops != NULL) | |
5270 | return (*the_low_target.emit_ops) (); | |
5271 | else | |
5272 | return NULL; | |
5273 | } | |
5274 | ||
405f8e94 SS |
5275 | static int |
5276 | linux_get_min_fast_tracepoint_insn_len (void) | |
5277 | { | |
5278 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5279 | } | |
5280 | ||
2268b414 JK |
5281 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5282 | ||
5283 | static int | |
5284 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5285 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5286 | { | |
5287 | char filename[PATH_MAX]; | |
5288 | int fd; | |
5289 | const int auxv_size = is_elf64 | |
5290 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5291 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5292 | ||
5293 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5294 | ||
5295 | fd = open (filename, O_RDONLY); | |
5296 | if (fd < 0) | |
5297 | return 1; | |
5298 | ||
5299 | *phdr_memaddr = 0; | |
5300 | *num_phdr = 0; | |
5301 | while (read (fd, buf, auxv_size) == auxv_size | |
5302 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5303 | { | |
5304 | if (is_elf64) | |
5305 | { | |
5306 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5307 | ||
5308 | switch (aux->a_type) | |
5309 | { | |
5310 | case AT_PHDR: | |
5311 | *phdr_memaddr = aux->a_un.a_val; | |
5312 | break; | |
5313 | case AT_PHNUM: | |
5314 | *num_phdr = aux->a_un.a_val; | |
5315 | break; | |
5316 | } | |
5317 | } | |
5318 | else | |
5319 | { | |
5320 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5321 | ||
5322 | switch (aux->a_type) | |
5323 | { | |
5324 | case AT_PHDR: | |
5325 | *phdr_memaddr = aux->a_un.a_val; | |
5326 | break; | |
5327 | case AT_PHNUM: | |
5328 | *num_phdr = aux->a_un.a_val; | |
5329 | break; | |
5330 | } | |
5331 | } | |
5332 | } | |
5333 | ||
5334 | close (fd); | |
5335 | ||
5336 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5337 | { | |
5338 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5339 | "phdr_memaddr = %ld, phdr_num = %d", | |
5340 | (long) *phdr_memaddr, *num_phdr); | |
5341 | return 2; | |
5342 | } | |
5343 | ||
5344 | return 0; | |
5345 | } | |
5346 | ||
5347 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5348 | ||
5349 | static CORE_ADDR | |
5350 | get_dynamic (const int pid, const int is_elf64) | |
5351 | { | |
5352 | CORE_ADDR phdr_memaddr, relocation; | |
5353 | int num_phdr, i; | |
5354 | unsigned char *phdr_buf; | |
5355 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5356 | ||
5357 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5358 | return 0; | |
5359 | ||
5360 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5361 | phdr_buf = alloca (num_phdr * phdr_size); | |
5362 | ||
5363 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5364 | return 0; | |
5365 | ||
5366 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5367 | non-zero for PIE ones. */ | |
5368 | relocation = -1; | |
5369 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5370 | if (is_elf64) | |
5371 | { | |
5372 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5373 | ||
5374 | if (p->p_type == PT_PHDR) | |
5375 | relocation = phdr_memaddr - p->p_vaddr; | |
5376 | } | |
5377 | else | |
5378 | { | |
5379 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5380 | ||
5381 | if (p->p_type == PT_PHDR) | |
5382 | relocation = phdr_memaddr - p->p_vaddr; | |
5383 | } | |
5384 | ||
5385 | if (relocation == -1) | |
5386 | { | |
e237a7e2 JK |
5387 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5388 | any real world executables, including PIE executables, have always | |
5389 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5390 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5391 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5392 | ||
5393 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5394 | ||
5395 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5396 | ||
2268b414 JK |
5397 | return 0; |
5398 | } | |
5399 | ||
5400 | for (i = 0; i < num_phdr; i++) | |
5401 | { | |
5402 | if (is_elf64) | |
5403 | { | |
5404 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5405 | ||
5406 | if (p->p_type == PT_DYNAMIC) | |
5407 | return p->p_vaddr + relocation; | |
5408 | } | |
5409 | else | |
5410 | { | |
5411 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5412 | ||
5413 | if (p->p_type == PT_DYNAMIC) | |
5414 | return p->p_vaddr + relocation; | |
5415 | } | |
5416 | } | |
5417 | ||
5418 | return 0; | |
5419 | } | |
5420 | ||
5421 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5422 | can be 0 if the inferior does not yet have the library list initialized. |
5423 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5424 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5425 | |
5426 | static CORE_ADDR | |
5427 | get_r_debug (const int pid, const int is_elf64) | |
5428 | { | |
5429 | CORE_ADDR dynamic_memaddr; | |
5430 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5431 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5432 | CORE_ADDR map = -1; |
2268b414 JK |
5433 | |
5434 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5435 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5436 | return map; |
2268b414 JK |
5437 | |
5438 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5439 | { | |
5440 | if (is_elf64) | |
5441 | { | |
5442 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
367ba2c2 MR |
5443 | union |
5444 | { | |
5445 | Elf64_Xword map; | |
5446 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5447 | } | |
5448 | rld_map; | |
5449 | ||
5450 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5451 | { | |
5452 | if (linux_read_memory (dyn->d_un.d_val, | |
5453 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5454 | return rld_map.map; | |
5455 | else | |
5456 | break; | |
5457 | } | |
2268b414 | 5458 | |
367ba2c2 MR |
5459 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5460 | map = dyn->d_un.d_val; | |
2268b414 JK |
5461 | |
5462 | if (dyn->d_tag == DT_NULL) | |
5463 | break; | |
5464 | } | |
5465 | else | |
5466 | { | |
5467 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
367ba2c2 MR |
5468 | union |
5469 | { | |
5470 | Elf32_Word map; | |
5471 | unsigned char buf[sizeof (Elf32_Word)]; | |
5472 | } | |
5473 | rld_map; | |
5474 | ||
5475 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5476 | { | |
5477 | if (linux_read_memory (dyn->d_un.d_val, | |
5478 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5479 | return rld_map.map; | |
5480 | else | |
5481 | break; | |
5482 | } | |
2268b414 | 5483 | |
367ba2c2 MR |
5484 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5485 | map = dyn->d_un.d_val; | |
2268b414 JK |
5486 | |
5487 | if (dyn->d_tag == DT_NULL) | |
5488 | break; | |
5489 | } | |
5490 | ||
5491 | dynamic_memaddr += dyn_size; | |
5492 | } | |
5493 | ||
367ba2c2 | 5494 | return map; |
2268b414 JK |
5495 | } |
5496 | ||
5497 | /* Read one pointer from MEMADDR in the inferior. */ | |
5498 | ||
5499 | static int | |
5500 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5501 | { | |
485f1ee4 PA |
5502 | int ret; |
5503 | ||
5504 | /* Go through a union so this works on either big or little endian | |
5505 | hosts, when the inferior's pointer size is smaller than the size | |
5506 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5507 | same of the superior's. */ | |
5508 | union | |
5509 | { | |
5510 | CORE_ADDR core_addr; | |
5511 | unsigned int ui; | |
5512 | unsigned char uc; | |
5513 | } addr; | |
5514 | ||
5515 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5516 | if (ret == 0) | |
5517 | { | |
5518 | if (ptr_size == sizeof (CORE_ADDR)) | |
5519 | *ptr = addr.core_addr; | |
5520 | else if (ptr_size == sizeof (unsigned int)) | |
5521 | *ptr = addr.ui; | |
5522 | else | |
5523 | gdb_assert_not_reached ("unhandled pointer size"); | |
5524 | } | |
5525 | return ret; | |
2268b414 JK |
5526 | } |
5527 | ||
5528 | struct link_map_offsets | |
5529 | { | |
5530 | /* Offset and size of r_debug.r_version. */ | |
5531 | int r_version_offset; | |
5532 | ||
5533 | /* Offset and size of r_debug.r_map. */ | |
5534 | int r_map_offset; | |
5535 | ||
5536 | /* Offset to l_addr field in struct link_map. */ | |
5537 | int l_addr_offset; | |
5538 | ||
5539 | /* Offset to l_name field in struct link_map. */ | |
5540 | int l_name_offset; | |
5541 | ||
5542 | /* Offset to l_ld field in struct link_map. */ | |
5543 | int l_ld_offset; | |
5544 | ||
5545 | /* Offset to l_next field in struct link_map. */ | |
5546 | int l_next_offset; | |
5547 | ||
5548 | /* Offset to l_prev field in struct link_map. */ | |
5549 | int l_prev_offset; | |
5550 | }; | |
5551 | ||
fb723180 | 5552 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5553 | |
5554 | static int | |
5555 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5556 | unsigned const char *writebuf, | |
5557 | CORE_ADDR offset, int len) | |
5558 | { | |
5559 | char *document; | |
5560 | unsigned document_len; | |
5561 | struct process_info_private *const priv = current_process ()->private; | |
5562 | char filename[PATH_MAX]; | |
5563 | int pid, is_elf64; | |
5564 | ||
5565 | static const struct link_map_offsets lmo_32bit_offsets = | |
5566 | { | |
5567 | 0, /* r_version offset. */ | |
5568 | 4, /* r_debug.r_map offset. */ | |
5569 | 0, /* l_addr offset in link_map. */ | |
5570 | 4, /* l_name offset in link_map. */ | |
5571 | 8, /* l_ld offset in link_map. */ | |
5572 | 12, /* l_next offset in link_map. */ | |
5573 | 16 /* l_prev offset in link_map. */ | |
5574 | }; | |
5575 | ||
5576 | static const struct link_map_offsets lmo_64bit_offsets = | |
5577 | { | |
5578 | 0, /* r_version offset. */ | |
5579 | 8, /* r_debug.r_map offset. */ | |
5580 | 0, /* l_addr offset in link_map. */ | |
5581 | 8, /* l_name offset in link_map. */ | |
5582 | 16, /* l_ld offset in link_map. */ | |
5583 | 24, /* l_next offset in link_map. */ | |
5584 | 32 /* l_prev offset in link_map. */ | |
5585 | }; | |
5586 | const struct link_map_offsets *lmo; | |
5587 | ||
5588 | if (writebuf != NULL) | |
5589 | return -2; | |
5590 | if (readbuf == NULL) | |
5591 | return -1; | |
5592 | ||
5593 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5594 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
5595 | is_elf64 = elf_64_file_p (filename); | |
5596 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; | |
5597 | ||
5598 | if (priv->r_debug == 0) | |
5599 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5600 | ||
5601 | if (priv->r_debug == (CORE_ADDR) -1 || priv->r_debug == 0) | |
5602 | { | |
5603 | document = xstrdup ("<library-list-svr4 version=\"1.0\"/>\n"); | |
5604 | } | |
5605 | else | |
5606 | { | |
5607 | int allocated = 1024; | |
5608 | char *p; | |
5609 | const int ptr_size = is_elf64 ? 8 : 4; | |
5610 | CORE_ADDR lm_addr, lm_prev, l_name, l_addr, l_ld, l_next, l_prev; | |
5611 | int r_version, header_done = 0; | |
5612 | ||
5613 | document = xmalloc (allocated); | |
5614 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5615 | p = document + strlen (document); | |
5616 | ||
5617 | r_version = 0; | |
5618 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, | |
5619 | (unsigned char *) &r_version, | |
5620 | sizeof (r_version)) != 0 | |
5621 | || r_version != 1) | |
5622 | { | |
5623 | warning ("unexpected r_debug version %d", r_version); | |
5624 | goto done; | |
5625 | } | |
5626 | ||
5627 | if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5628 | &lm_addr, ptr_size) != 0) | |
5629 | { | |
5630 | warning ("unable to read r_map from 0x%lx", | |
5631 | (long) priv->r_debug + lmo->r_map_offset); | |
5632 | goto done; | |
5633 | } | |
5634 | ||
5635 | lm_prev = 0; | |
5636 | while (read_one_ptr (lm_addr + lmo->l_name_offset, | |
5637 | &l_name, ptr_size) == 0 | |
5638 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5639 | &l_addr, ptr_size) == 0 | |
5640 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5641 | &l_ld, ptr_size) == 0 | |
5642 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5643 | &l_prev, ptr_size) == 0 | |
5644 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5645 | &l_next, ptr_size) == 0) | |
5646 | { | |
5647 | unsigned char libname[PATH_MAX]; | |
5648 | ||
5649 | if (lm_prev != l_prev) | |
5650 | { | |
5651 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", | |
5652 | (long) lm_prev, (long) l_prev); | |
5653 | break; | |
5654 | } | |
5655 | ||
5656 | /* Not checking for error because reading may stop before | |
5657 | we've got PATH_MAX worth of characters. */ | |
5658 | libname[0] = '\0'; | |
5659 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5660 | libname[sizeof (libname) - 1] = '\0'; | |
5661 | if (libname[0] != '\0') | |
5662 | { | |
5663 | /* 6x the size for xml_escape_text below. */ | |
5664 | size_t len = 6 * strlen ((char *) libname); | |
5665 | char *name; | |
5666 | ||
5667 | if (!header_done) | |
5668 | { | |
5669 | /* Terminate `<library-list-svr4'. */ | |
5670 | *p++ = '>'; | |
5671 | header_done = 1; | |
5672 | } | |
5673 | ||
5674 | while (allocated < p - document + len + 200) | |
5675 | { | |
5676 | /* Expand to guarantee sufficient storage. */ | |
5677 | uintptr_t document_len = p - document; | |
5678 | ||
5679 | document = xrealloc (document, 2 * allocated); | |
5680 | allocated *= 2; | |
5681 | p = document + document_len; | |
5682 | } | |
5683 | ||
5684 | name = xml_escape_text ((char *) libname); | |
5685 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5686 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5687 | name, (unsigned long) lm_addr, | |
5688 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5689 | free (name); | |
5690 | } | |
5691 | else if (lm_prev == 0) | |
5692 | { | |
5693 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); | |
5694 | p = p + strlen (p); | |
5695 | } | |
5696 | ||
5697 | if (l_next == 0) | |
5698 | break; | |
5699 | ||
5700 | lm_prev = lm_addr; | |
5701 | lm_addr = l_next; | |
5702 | } | |
5703 | done: | |
0afae3cf PA |
5704 | if (!header_done) |
5705 | { | |
5706 | /* Empty list; terminate `<library-list-svr4'. */ | |
5707 | strcpy (p, "/>"); | |
5708 | } | |
5709 | else | |
5710 | strcpy (p, "</library-list-svr4>"); | |
2268b414 JK |
5711 | } |
5712 | ||
5713 | document_len = strlen (document); | |
5714 | if (offset < document_len) | |
5715 | document_len -= offset; | |
5716 | else | |
5717 | document_len = 0; | |
5718 | if (len > document_len) | |
5719 | len = document_len; | |
5720 | ||
5721 | memcpy (readbuf, document + offset, len); | |
5722 | xfree (document); | |
5723 | ||
5724 | return len; | |
5725 | } | |
5726 | ||
ce3a066d DJ |
5727 | static struct target_ops linux_target_ops = { |
5728 | linux_create_inferior, | |
5729 | linux_attach, | |
5730 | linux_kill, | |
6ad8ae5c | 5731 | linux_detach, |
8336d594 | 5732 | linux_mourn, |
444d6139 | 5733 | linux_join, |
ce3a066d DJ |
5734 | linux_thread_alive, |
5735 | linux_resume, | |
5736 | linux_wait, | |
5737 | linux_fetch_registers, | |
5738 | linux_store_registers, | |
90d74c30 | 5739 | linux_prepare_to_access_memory, |
0146f85b | 5740 | linux_done_accessing_memory, |
ce3a066d DJ |
5741 | linux_read_memory, |
5742 | linux_write_memory, | |
2f2893d9 | 5743 | linux_look_up_symbols, |
ef57601b | 5744 | linux_request_interrupt, |
aa691b87 | 5745 | linux_read_auxv, |
d993e290 PA |
5746 | linux_insert_point, |
5747 | linux_remove_point, | |
e013ee27 OF |
5748 | linux_stopped_by_watchpoint, |
5749 | linux_stopped_data_address, | |
42c81e2a | 5750 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 5751 | linux_read_offsets, |
dae5f5cf DJ |
5752 | #else |
5753 | NULL, | |
5754 | #endif | |
5755 | #ifdef USE_THREAD_DB | |
5756 | thread_db_get_tls_address, | |
5757 | #else | |
5758 | NULL, | |
52fb6437 | 5759 | #endif |
efcbbd14 | 5760 | linux_qxfer_spu, |
59a016f0 | 5761 | hostio_last_error_from_errno, |
07e059b5 | 5762 | linux_qxfer_osdata, |
4aa995e1 | 5763 | linux_xfer_siginfo, |
bd99dc85 PA |
5764 | linux_supports_non_stop, |
5765 | linux_async, | |
5766 | linux_start_non_stop, | |
cdbfd419 PP |
5767 | linux_supports_multi_process, |
5768 | #ifdef USE_THREAD_DB | |
dc146f7c | 5769 | thread_db_handle_monitor_command, |
cdbfd419 | 5770 | #else |
dc146f7c | 5771 | NULL, |
cdbfd419 | 5772 | #endif |
d26e3629 | 5773 | linux_common_core_of_thread, |
78d85199 | 5774 | linux_read_loadmap, |
219f2f23 PA |
5775 | linux_process_qsupported, |
5776 | linux_supports_tracepoints, | |
5777 | linux_read_pc, | |
8336d594 PA |
5778 | linux_write_pc, |
5779 | linux_thread_stopped, | |
7984d532 | 5780 | NULL, |
711e434b | 5781 | linux_pause_all, |
7984d532 | 5782 | linux_unpause_all, |
fa593d66 PA |
5783 | linux_cancel_breakpoints, |
5784 | linux_stabilize_threads, | |
6a271cae | 5785 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
5786 | linux_emit_ops, |
5787 | linux_supports_disable_randomization, | |
405f8e94 | 5788 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 5789 | linux_qxfer_libraries_svr4, |
d1feda86 | 5790 | linux_supports_agent, |
ce3a066d DJ |
5791 | }; |
5792 | ||
0d62e5e8 DJ |
5793 | static void |
5794 | linux_init_signals () | |
5795 | { | |
5796 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5797 | to find what the cancel signal actually is. */ | |
1a981360 | 5798 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5799 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5800 | #endif |
0d62e5e8 DJ |
5801 | } |
5802 | ||
da6d8c04 DJ |
5803 | void |
5804 | initialize_low (void) | |
5805 | { | |
bd99dc85 PA |
5806 | struct sigaction sigchld_action; |
5807 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5808 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5809 | set_breakpoint_data (the_low_target.breakpoint, |
5810 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5811 | linux_init_signals (); |
24a09b5f | 5812 | linux_test_for_tracefork (); |
52fa2412 UW |
5813 | #ifdef HAVE_LINUX_REGSETS |
5814 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
5815 | ; | |
bca929d3 | 5816 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 5817 | #endif |
bd99dc85 PA |
5818 | |
5819 | sigchld_action.sa_handler = sigchld_handler; | |
5820 | sigemptyset (&sigchld_action.sa_mask); | |
5821 | sigchld_action.sa_flags = SA_RESTART; | |
5822 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 5823 | } |