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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 | |
214d508e | 266 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 267 | { |
214d508e L |
268 | if (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 | { | |
273 | *machine = header->e_machine; | |
274 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
275 | ||
276 | } | |
277 | *machine = EM_NONE; | |
278 | return -1; | |
d0722149 DE |
279 | } |
280 | ||
281 | /* Return non-zero if FILE is a 64-bit ELF file, | |
282 | zero if the file is not a 64-bit ELF file, | |
283 | and -1 if the file is not accessible or doesn't exist. */ | |
284 | ||
be07f1a2 | 285 | static int |
214d508e | 286 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 287 | { |
957f3f49 | 288 | Elf64_Ehdr header; |
d0722149 DE |
289 | int fd; |
290 | ||
291 | fd = open (file, O_RDONLY); | |
292 | if (fd < 0) | |
293 | return -1; | |
294 | ||
295 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
296 | { | |
297 | close (fd); | |
298 | return 0; | |
299 | } | |
300 | close (fd); | |
301 | ||
214d508e | 302 | return elf_64_header_p (&header, machine); |
d0722149 DE |
303 | } |
304 | ||
be07f1a2 PA |
305 | /* Accepts an integer PID; Returns true if the executable PID is |
306 | running is a 64-bit ELF file.. */ | |
307 | ||
308 | int | |
214d508e | 309 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 PA |
310 | { |
311 | char file[MAXPATHLEN]; | |
312 | ||
313 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 314 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
315 | } |
316 | ||
bd99dc85 PA |
317 | static void |
318 | delete_lwp (struct lwp_info *lwp) | |
319 | { | |
320 | remove_thread (get_lwp_thread (lwp)); | |
321 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 322 | free (lwp->arch_private); |
bd99dc85 PA |
323 | free (lwp); |
324 | } | |
325 | ||
95954743 PA |
326 | /* Add a process to the common process list, and set its private |
327 | data. */ | |
328 | ||
329 | static struct process_info * | |
330 | linux_add_process (int pid, int attached) | |
331 | { | |
332 | struct process_info *proc; | |
333 | ||
334 | /* Is this the first process? If so, then set the arch. */ | |
335 | if (all_processes.head == NULL) | |
336 | new_inferior = 1; | |
337 | ||
338 | proc = add_process (pid, attached); | |
339 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
340 | ||
aa5ca48f DE |
341 | if (the_low_target.new_process != NULL) |
342 | proc->private->arch_private = the_low_target.new_process (); | |
343 | ||
95954743 PA |
344 | return proc; |
345 | } | |
346 | ||
07d4f67e DE |
347 | /* Wrapper function for waitpid which handles EINTR, and emulates |
348 | __WALL for systems where that is not available. */ | |
349 | ||
350 | static int | |
351 | my_waitpid (int pid, int *status, int flags) | |
352 | { | |
353 | int ret, out_errno; | |
354 | ||
355 | if (debug_threads) | |
356 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
357 | ||
358 | if (flags & __WALL) | |
359 | { | |
360 | sigset_t block_mask, org_mask, wake_mask; | |
361 | int wnohang; | |
362 | ||
363 | wnohang = (flags & WNOHANG) != 0; | |
364 | flags &= ~(__WALL | __WCLONE); | |
365 | flags |= WNOHANG; | |
366 | ||
367 | /* Block all signals while here. This avoids knowing about | |
368 | LinuxThread's signals. */ | |
369 | sigfillset (&block_mask); | |
370 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
371 | ||
372 | /* ... except during the sigsuspend below. */ | |
373 | sigemptyset (&wake_mask); | |
374 | ||
375 | while (1) | |
376 | { | |
377 | /* Since all signals are blocked, there's no need to check | |
378 | for EINTR here. */ | |
379 | ret = waitpid (pid, status, flags); | |
380 | out_errno = errno; | |
381 | ||
382 | if (ret == -1 && out_errno != ECHILD) | |
383 | break; | |
384 | else if (ret > 0) | |
385 | break; | |
386 | ||
387 | if (flags & __WCLONE) | |
388 | { | |
389 | /* We've tried both flavors now. If WNOHANG is set, | |
390 | there's nothing else to do, just bail out. */ | |
391 | if (wnohang) | |
392 | break; | |
393 | ||
394 | if (debug_threads) | |
395 | fprintf (stderr, "blocking\n"); | |
396 | ||
397 | /* Block waiting for signals. */ | |
398 | sigsuspend (&wake_mask); | |
399 | } | |
400 | ||
401 | flags ^= __WCLONE; | |
402 | } | |
403 | ||
404 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
405 | } | |
406 | else | |
407 | { | |
408 | do | |
409 | ret = waitpid (pid, status, flags); | |
410 | while (ret == -1 && errno == EINTR); | |
411 | out_errno = errno; | |
412 | } | |
413 | ||
414 | if (debug_threads) | |
415 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
416 | pid, flags, status ? *status : -1, ret); | |
417 | ||
418 | errno = out_errno; | |
419 | return ret; | |
420 | } | |
421 | ||
bd99dc85 PA |
422 | /* Handle a GNU/Linux extended wait response. If we see a clone |
423 | event, we need to add the new LWP to our list (and not report the | |
424 | trap to higher layers). */ | |
0d62e5e8 | 425 | |
24a09b5f | 426 | static void |
54a0b537 | 427 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
428 | { |
429 | int event = wstat >> 16; | |
54a0b537 | 430 | struct lwp_info *new_lwp; |
24a09b5f DJ |
431 | |
432 | if (event == PTRACE_EVENT_CLONE) | |
433 | { | |
95954743 | 434 | ptid_t ptid; |
24a09b5f | 435 | unsigned long new_pid; |
05044653 | 436 | int ret, status; |
24a09b5f | 437 | |
bd99dc85 | 438 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
439 | |
440 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 441 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
442 | { |
443 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
444 | hits the SIGSTOP, but we're already attached. */ | |
445 | ||
97438e3f | 446 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
447 | |
448 | if (ret == -1) | |
449 | perror_with_name ("waiting for new child"); | |
450 | else if (ret != new_pid) | |
451 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 452 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
453 | warning ("wait returned unexpected status 0x%x", status); |
454 | } | |
455 | ||
1e7fc18c | 456 | linux_enable_event_reporting (new_pid); |
24a09b5f | 457 | |
95954743 PA |
458 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
459 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
460 | add_thread (ptid, new_lwp); | |
24a09b5f | 461 | |
e27d73f6 DE |
462 | /* Either we're going to immediately resume the new thread |
463 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
464 | thinks the thread is currently running, so set this first | |
465 | before calling linux_resume_one_lwp. */ | |
466 | new_lwp->stopped = 1; | |
467 | ||
da5898ce DJ |
468 | /* Normally we will get the pending SIGSTOP. But in some cases |
469 | we might get another signal delivered to the group first. | |
f21cc1a2 | 470 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
471 | if (WSTOPSIG (status) == SIGSTOP) |
472 | { | |
d50171e4 PA |
473 | if (stopping_threads) |
474 | new_lwp->stop_pc = get_stop_pc (new_lwp); | |
475 | else | |
e27d73f6 | 476 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 477 | } |
24a09b5f | 478 | else |
da5898ce | 479 | { |
54a0b537 | 480 | new_lwp->stop_expected = 1; |
d50171e4 | 481 | |
da5898ce DJ |
482 | if (stopping_threads) |
483 | { | |
d50171e4 | 484 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
485 | new_lwp->status_pending_p = 1; |
486 | new_lwp->status_pending = status; | |
da5898ce DJ |
487 | } |
488 | else | |
489 | /* Pass the signal on. This is what GDB does - except | |
490 | shouldn't we really report it instead? */ | |
e27d73f6 | 491 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 492 | } |
24a09b5f DJ |
493 | |
494 | /* Always resume the current thread. If we are stopping | |
495 | threads, it will have a pending SIGSTOP; we may as well | |
496 | collect it now. */ | |
2acc282a | 497 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
498 | } |
499 | } | |
500 | ||
d50171e4 PA |
501 | /* Return the PC as read from the regcache of LWP, without any |
502 | adjustment. */ | |
503 | ||
504 | static CORE_ADDR | |
505 | get_pc (struct lwp_info *lwp) | |
506 | { | |
507 | struct thread_info *saved_inferior; | |
508 | struct regcache *regcache; | |
509 | CORE_ADDR pc; | |
510 | ||
511 | if (the_low_target.get_pc == NULL) | |
512 | return 0; | |
513 | ||
514 | saved_inferior = current_inferior; | |
515 | current_inferior = get_lwp_thread (lwp); | |
516 | ||
517 | regcache = get_thread_regcache (current_inferior, 1); | |
518 | pc = (*the_low_target.get_pc) (regcache); | |
519 | ||
520 | if (debug_threads) | |
521 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
522 | ||
523 | current_inferior = saved_inferior; | |
524 | return pc; | |
525 | } | |
526 | ||
527 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
528 | The SIGTRAP could mean several things. |
529 | ||
530 | On i386, where decr_pc_after_break is non-zero: | |
531 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
532 | we will get only the one SIGTRAP (even if the instruction we | |
533 | stepped over was a breakpoint). The value of $eip will be the | |
534 | next instruction. | |
535 | If we continue the process using PTRACE_CONT, we will get a | |
536 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
537 | the instruction after the breakpoint (i.e. needs to be | |
538 | decremented). If we report the SIGTRAP to GDB, we must also | |
539 | report the undecremented PC. If we cancel the SIGTRAP, we | |
540 | must resume at the decremented PC. | |
541 | ||
542 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
543 | with hardware or kernel single-step: | |
544 | If we single-step over a breakpoint instruction, our PC will | |
545 | point at the following instruction. If we continue and hit a | |
546 | breakpoint instruction, our PC will point at the breakpoint | |
547 | instruction. */ | |
548 | ||
549 | static CORE_ADDR | |
d50171e4 | 550 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 551 | { |
d50171e4 PA |
552 | CORE_ADDR stop_pc; |
553 | ||
554 | if (the_low_target.get_pc == NULL) | |
555 | return 0; | |
0d62e5e8 | 556 | |
d50171e4 PA |
557 | stop_pc = get_pc (lwp); |
558 | ||
bdabb078 PA |
559 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
560 | && !lwp->stepping | |
561 | && !lwp->stopped_by_watchpoint | |
562 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
563 | stop_pc -= the_low_target.decr_pc_after_break; |
564 | ||
565 | if (debug_threads) | |
566 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
567 | ||
568 | return stop_pc; | |
0d62e5e8 | 569 | } |
ce3a066d | 570 | |
0d62e5e8 | 571 | static void * |
95954743 | 572 | add_lwp (ptid_t ptid) |
611cb4a5 | 573 | { |
54a0b537 | 574 | struct lwp_info *lwp; |
0d62e5e8 | 575 | |
54a0b537 PA |
576 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
577 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 578 | |
95954743 | 579 | lwp->head.id = ptid; |
0d62e5e8 | 580 | |
aa5ca48f DE |
581 | if (the_low_target.new_thread != NULL) |
582 | lwp->arch_private = the_low_target.new_thread (); | |
583 | ||
54a0b537 | 584 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 585 | |
54a0b537 | 586 | return lwp; |
0d62e5e8 | 587 | } |
611cb4a5 | 588 | |
da6d8c04 DJ |
589 | /* Start an inferior process and returns its pid. |
590 | ALLARGS is a vector of program-name and args. */ | |
591 | ||
ce3a066d DJ |
592 | static int |
593 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 594 | { |
03583c20 UW |
595 | #ifdef HAVE_PERSONALITY |
596 | int personality_orig = 0, personality_set = 0; | |
597 | #endif | |
a6dbe5df | 598 | struct lwp_info *new_lwp; |
da6d8c04 | 599 | int pid; |
95954743 | 600 | ptid_t ptid; |
da6d8c04 | 601 | |
03583c20 UW |
602 | #ifdef HAVE_PERSONALITY |
603 | if (disable_randomization) | |
604 | { | |
605 | errno = 0; | |
606 | personality_orig = personality (0xffffffff); | |
607 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
608 | { | |
609 | personality_set = 1; | |
610 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
611 | } | |
612 | if (errno != 0 || (personality_set | |
613 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
614 | warning ("Error disabling address space randomization: %s", | |
615 | strerror (errno)); | |
616 | } | |
617 | #endif | |
618 | ||
42c81e2a | 619 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
620 | pid = vfork (); |
621 | #else | |
da6d8c04 | 622 | pid = fork (); |
52fb6437 | 623 | #endif |
da6d8c04 DJ |
624 | if (pid < 0) |
625 | perror_with_name ("fork"); | |
626 | ||
627 | if (pid == 0) | |
628 | { | |
629 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
630 | ||
1a981360 | 631 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 632 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 633 | #endif |
0d62e5e8 | 634 | |
a9fa9f7d DJ |
635 | setpgid (0, 0); |
636 | ||
e0f9f062 DE |
637 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
638 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
639 | Also, redirect stdin to /dev/null. */ | |
640 | if (remote_connection_is_stdio ()) | |
641 | { | |
642 | close (0); | |
643 | open ("/dev/null", O_RDONLY); | |
644 | dup2 (2, 1); | |
3e52c33d JK |
645 | if (write (2, "stdin/stdout redirected\n", |
646 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
647 | /* Errors ignored. */; | |
e0f9f062 DE |
648 | } |
649 | ||
2b876972 DJ |
650 | execv (program, allargs); |
651 | if (errno == ENOENT) | |
652 | execvp (program, allargs); | |
da6d8c04 DJ |
653 | |
654 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 655 | strerror (errno)); |
da6d8c04 DJ |
656 | fflush (stderr); |
657 | _exit (0177); | |
658 | } | |
659 | ||
03583c20 UW |
660 | #ifdef HAVE_PERSONALITY |
661 | if (personality_set) | |
662 | { | |
663 | errno = 0; | |
664 | personality (personality_orig); | |
665 | if (errno != 0) | |
666 | warning ("Error restoring address space randomization: %s", | |
667 | strerror (errno)); | |
668 | } | |
669 | #endif | |
670 | ||
95954743 PA |
671 | linux_add_process (pid, 0); |
672 | ||
673 | ptid = ptid_build (pid, pid, 0); | |
674 | new_lwp = add_lwp (ptid); | |
675 | add_thread (ptid, new_lwp); | |
a6dbe5df | 676 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 677 | |
a9fa9f7d | 678 | return pid; |
da6d8c04 DJ |
679 | } |
680 | ||
681 | /* Attach to an inferior process. */ | |
682 | ||
95954743 PA |
683 | static void |
684 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 685 | { |
95954743 | 686 | ptid_t ptid; |
54a0b537 | 687 | struct lwp_info *new_lwp; |
611cb4a5 | 688 | |
95954743 | 689 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 690 | { |
87b0bb13 JK |
691 | struct buffer buffer; |
692 | ||
95954743 | 693 | if (!initial) |
2d717e4f DJ |
694 | { |
695 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 696 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
697 | strerror (errno), errno); |
698 | fflush (stderr); | |
699 | return; | |
700 | } | |
5f572dec JK |
701 | |
702 | /* If we fail to attach to a process, report an error. */ | |
87b0bb13 JK |
703 | buffer_init (&buffer); |
704 | linux_ptrace_attach_warnings (lwpid, &buffer); | |
705 | buffer_grow_str0 (&buffer, ""); | |
706 | error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer), | |
707 | lwpid, strerror (errno), errno); | |
da6d8c04 DJ |
708 | } |
709 | ||
95954743 | 710 | if (initial) |
e3deef73 LM |
711 | /* If lwp is the tgid, we handle adding existing threads later. |
712 | Otherwise we just add lwp without bothering about any other | |
713 | threads. */ | |
95954743 PA |
714 | ptid = ptid_build (lwpid, lwpid, 0); |
715 | else | |
716 | { | |
717 | /* Note that extracting the pid from the current inferior is | |
718 | safe, since we're always called in the context of the same | |
719 | process as this new thread. */ | |
720 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
721 | ptid = ptid_build (pid, lwpid, 0); | |
722 | } | |
24a09b5f | 723 | |
95954743 PA |
724 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
725 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 726 | |
a6dbe5df PA |
727 | /* We need to wait for SIGSTOP before being able to make the next |
728 | ptrace call on this LWP. */ | |
729 | new_lwp->must_set_ptrace_flags = 1; | |
730 | ||
644cebc9 | 731 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
732 | { |
733 | if (debug_threads) | |
734 | fprintf (stderr, | |
735 | "Attached to a stopped process\n"); | |
736 | ||
737 | /* The process is definitely stopped. It is in a job control | |
738 | stop, unless the kernel predates the TASK_STOPPED / | |
739 | TASK_TRACED distinction, in which case it might be in a | |
740 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
741 | can kill it, signal it, et cetera. | |
742 | ||
743 | First make sure there is a pending SIGSTOP. Since we are | |
744 | already attached, the process can not transition from stopped | |
745 | to running without a PTRACE_CONT; so we know this signal will | |
746 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
747 | probably already in the queue (unless this kernel is old | |
748 | enough to use TASK_STOPPED for ptrace stops); but since | |
749 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
750 | kill_lwp (lwpid, SIGSTOP); | |
751 | ||
752 | /* Finally, resume the stopped process. This will deliver the | |
753 | SIGSTOP (or a higher priority signal, just like normal | |
754 | PTRACE_ATTACH), which we'll catch later on. */ | |
755 | ptrace (PTRACE_CONT, lwpid, 0, 0); | |
756 | } | |
757 | ||
0d62e5e8 | 758 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
759 | brings it to a halt. |
760 | ||
761 | There are several cases to consider here: | |
762 | ||
763 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 764 | of a new thread that is being created. |
d50171e4 PA |
765 | In this case we should ignore that SIGSTOP and resume the |
766 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 767 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 768 | resume_continue. |
0e21c1ec DE |
769 | |
770 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
771 | to it via attach_inferior. |
772 | In this case we want the process thread to stop. | |
d50171e4 PA |
773 | This is handled by having linux_attach set last_resume_kind == |
774 | resume_stop after we return. | |
e3deef73 LM |
775 | |
776 | If the pid we are attaching to is also the tgid, we attach to and | |
777 | stop all the existing threads. Otherwise, we attach to pid and | |
778 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
779 | |
780 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
781 | existing threads. |
782 | In this case we want the thread to stop. | |
783 | FIXME: This case is currently not properly handled. | |
784 | We should wait for the SIGSTOP but don't. Things work apparently | |
785 | because enough time passes between when we ptrace (ATTACH) and when | |
786 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
787 | |
788 | On the other hand, if we are currently trying to stop all threads, we | |
789 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 790 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
791 | end of the list, and so the new thread has not yet reached |
792 | wait_for_sigstop (but will). */ | |
d50171e4 | 793 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
794 | } |
795 | ||
95954743 PA |
796 | void |
797 | linux_attach_lwp (unsigned long lwpid) | |
798 | { | |
799 | linux_attach_lwp_1 (lwpid, 0); | |
800 | } | |
801 | ||
e3deef73 LM |
802 | /* Attach to PID. If PID is the tgid, attach to it and all |
803 | of its threads. */ | |
804 | ||
0d62e5e8 | 805 | int |
a1928bad | 806 | linux_attach (unsigned long pid) |
0d62e5e8 | 807 | { |
e3deef73 LM |
808 | /* Attach to PID. We will check for other threads |
809 | soon. */ | |
95954743 | 810 | linux_attach_lwp_1 (pid, 1); |
95954743 | 811 | linux_add_process (pid, 1); |
0d62e5e8 | 812 | |
bd99dc85 PA |
813 | if (!non_stop) |
814 | { | |
8336d594 PA |
815 | struct thread_info *thread; |
816 | ||
817 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
818 | process. It will be collected by wait shortly. */ | |
819 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
820 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 821 | } |
0d62e5e8 | 822 | |
e3deef73 LM |
823 | if (linux_proc_get_tgid (pid) == pid) |
824 | { | |
825 | DIR *dir; | |
826 | char pathname[128]; | |
827 | ||
828 | sprintf (pathname, "/proc/%ld/task", pid); | |
829 | ||
830 | dir = opendir (pathname); | |
831 | ||
832 | if (!dir) | |
833 | { | |
834 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
835 | fflush (stderr); | |
836 | } | |
837 | else | |
838 | { | |
839 | /* At this point we attached to the tgid. Scan the task for | |
840 | existing threads. */ | |
841 | unsigned long lwp; | |
842 | int new_threads_found; | |
843 | int iterations = 0; | |
844 | struct dirent *dp; | |
845 | ||
846 | while (iterations < 2) | |
847 | { | |
848 | new_threads_found = 0; | |
849 | /* Add all the other threads. While we go through the | |
850 | threads, new threads may be spawned. Cycle through | |
851 | the list of threads until we have done two iterations without | |
852 | finding new threads. */ | |
853 | while ((dp = readdir (dir)) != NULL) | |
854 | { | |
855 | /* Fetch one lwp. */ | |
856 | lwp = strtoul (dp->d_name, NULL, 10); | |
857 | ||
858 | /* Is this a new thread? */ | |
859 | if (lwp | |
860 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
861 | { | |
862 | linux_attach_lwp_1 (lwp, 0); | |
863 | new_threads_found++; | |
864 | ||
865 | if (debug_threads) | |
866 | fprintf (stderr, "\ | |
867 | Found and attached to new lwp %ld\n", lwp); | |
868 | } | |
869 | } | |
870 | ||
871 | if (!new_threads_found) | |
872 | iterations++; | |
873 | else | |
874 | iterations = 0; | |
875 | ||
876 | rewinddir (dir); | |
877 | } | |
878 | closedir (dir); | |
879 | } | |
880 | } | |
881 | ||
95954743 PA |
882 | return 0; |
883 | } | |
884 | ||
885 | struct counter | |
886 | { | |
887 | int pid; | |
888 | int count; | |
889 | }; | |
890 | ||
891 | static int | |
892 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
893 | { | |
894 | struct counter *counter = args; | |
895 | ||
896 | if (ptid_get_pid (entry->id) == counter->pid) | |
897 | { | |
898 | if (++counter->count > 1) | |
899 | return 1; | |
900 | } | |
d61ddec4 | 901 | |
da6d8c04 DJ |
902 | return 0; |
903 | } | |
904 | ||
95954743 PA |
905 | static int |
906 | last_thread_of_process_p (struct thread_info *thread) | |
907 | { | |
908 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
909 | int pid = ptid_get_pid (ptid); | |
910 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 911 | |
95954743 PA |
912 | return (find_inferior (&all_threads, |
913 | second_thread_of_pid_p, &counter) == NULL); | |
914 | } | |
915 | ||
da84f473 PA |
916 | /* Kill LWP. */ |
917 | ||
918 | static void | |
919 | linux_kill_one_lwp (struct lwp_info *lwp) | |
920 | { | |
921 | int pid = lwpid_of (lwp); | |
922 | ||
923 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
924 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
925 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
926 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
927 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
928 | per process, not one for each thread. But since we still support | |
929 | linuxthreads, and we also support debugging programs using raw | |
930 | clone without CLONE_THREAD, we send one for each thread. For | |
931 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
932 | about some old kernels where PTRACE_KILL might work better | |
933 | (dubious if there are any such, but that's why it's paranoia), so | |
934 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
935 | everywhere. */ | |
936 | ||
937 | errno = 0; | |
938 | kill (pid, SIGKILL); | |
939 | if (debug_threads) | |
940 | fprintf (stderr, | |
941 | "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
942 | target_pid_to_str (ptid_of (lwp)), | |
943 | errno ? strerror (errno) : "OK"); | |
944 | ||
945 | errno = 0; | |
946 | ptrace (PTRACE_KILL, pid, 0, 0); | |
947 | if (debug_threads) | |
948 | fprintf (stderr, | |
949 | "LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
950 | target_pid_to_str (ptid_of (lwp)), | |
951 | errno ? strerror (errno) : "OK"); | |
952 | } | |
953 | ||
954 | /* Callback for `find_inferior'. Kills an lwp of a given process, | |
955 | except the leader. */ | |
95954743 PA |
956 | |
957 | static int | |
da84f473 | 958 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 959 | { |
0d62e5e8 | 960 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 961 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 962 | int wstat; |
95954743 PA |
963 | int pid = * (int *) args; |
964 | ||
965 | if (ptid_get_pid (entry->id) != pid) | |
966 | return 0; | |
0d62e5e8 | 967 | |
fd500816 DJ |
968 | /* We avoid killing the first thread here, because of a Linux kernel (at |
969 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
970 | the children get a chance to be reaped, it will remain a zombie | |
971 | forever. */ | |
95954743 | 972 | |
12b42a12 | 973 | if (lwpid_of (lwp) == pid) |
95954743 PA |
974 | { |
975 | if (debug_threads) | |
976 | fprintf (stderr, "lkop: is last of process %s\n", | |
977 | target_pid_to_str (entry->id)); | |
978 | return 0; | |
979 | } | |
fd500816 | 980 | |
0d62e5e8 DJ |
981 | do |
982 | { | |
da84f473 | 983 | linux_kill_one_lwp (lwp); |
0d62e5e8 DJ |
984 | |
985 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 986 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 987 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
988 | |
989 | return 0; | |
da6d8c04 DJ |
990 | } |
991 | ||
95954743 PA |
992 | static int |
993 | linux_kill (int pid) | |
0d62e5e8 | 994 | { |
95954743 | 995 | struct process_info *process; |
54a0b537 | 996 | struct lwp_info *lwp; |
fd500816 | 997 | int wstat; |
95954743 | 998 | int lwpid; |
fd500816 | 999 | |
95954743 PA |
1000 | process = find_process_pid (pid); |
1001 | if (process == NULL) | |
1002 | return -1; | |
9d606399 | 1003 | |
f9e39928 PA |
1004 | /* If we're killing a running inferior, make sure it is stopped |
1005 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1006 | stop_all_lwps (0, NULL); |
f9e39928 | 1007 | |
da84f473 | 1008 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1009 | |
54a0b537 | 1010 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1011 | thread in the list, so do so now. */ |
95954743 | 1012 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1013 | |
784867a5 | 1014 | if (lwp == NULL) |
fd500816 | 1015 | { |
784867a5 JK |
1016 | if (debug_threads) |
1017 | fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n", | |
1018 | lwpid_of (lwp), pid); | |
1019 | } | |
1020 | else | |
1021 | { | |
1022 | if (debug_threads) | |
1023 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", | |
1024 | lwpid_of (lwp), pid); | |
fd500816 | 1025 | |
784867a5 JK |
1026 | do |
1027 | { | |
da84f473 | 1028 | linux_kill_one_lwp (lwp); |
784867a5 JK |
1029 | |
1030 | /* Make sure it died. The loop is most likely unnecessary. */ | |
1031 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); | |
1032 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
1033 | } | |
2d717e4f | 1034 | |
8336d594 | 1035 | the_target->mourn (process); |
f9e39928 PA |
1036 | |
1037 | /* Since we presently can only stop all lwps of all processes, we | |
1038 | need to unstop lwps of other processes. */ | |
7984d532 | 1039 | unstop_all_lwps (0, NULL); |
95954743 | 1040 | return 0; |
0d62e5e8 DJ |
1041 | } |
1042 | ||
9b224c5e PA |
1043 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1044 | signal the thread last stopped for, which we need to deliver to the | |
1045 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1046 | ||
1047 | static int | |
1048 | get_detach_signal (struct thread_info *thread) | |
1049 | { | |
1050 | enum target_signal signo = TARGET_SIGNAL_0; | |
1051 | int status; | |
1052 | struct lwp_info *lp = get_thread_lwp (thread); | |
1053 | ||
1054 | if (lp->status_pending_p) | |
1055 | status = lp->status_pending; | |
1056 | else | |
1057 | { | |
1058 | /* If the thread had been suspended by gdbserver, and it stopped | |
1059 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1060 | want to deliver that SIGSTOP. */ | |
1061 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
1062 | || thread->last_status.value.sig == TARGET_SIGNAL_0) | |
1063 | return 0; | |
1064 | ||
1065 | /* Otherwise, we may need to deliver the signal we | |
1066 | intercepted. */ | |
1067 | status = lp->last_status; | |
1068 | } | |
1069 | ||
1070 | if (!WIFSTOPPED (status)) | |
1071 | { | |
1072 | if (debug_threads) | |
1073 | fprintf (stderr, | |
1074 | "GPS: lwp %s hasn't stopped: no pending signal\n", | |
1075 | target_pid_to_str (ptid_of (lp))); | |
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
1080 | if (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1081 | { | |
1082 | if (debug_threads) | |
1083 | fprintf (stderr, | |
1084 | "GPS: lwp %s had stopped with extended " | |
1085 | "status: no pending signal\n", | |
1086 | target_pid_to_str (ptid_of (lp))); | |
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | signo = target_signal_from_host (WSTOPSIG (status)); | |
1091 | ||
1092 | if (program_signals_p && !program_signals[signo]) | |
1093 | { | |
1094 | if (debug_threads) | |
1095 | fprintf (stderr, | |
1096 | "GPS: lwp %s had signal %s, but it is in nopass state\n", | |
1097 | target_pid_to_str (ptid_of (lp)), | |
1098 | target_signal_to_string (signo)); | |
1099 | return 0; | |
1100 | } | |
1101 | else if (!program_signals_p | |
1102 | /* If we have no way to know which signals GDB does not | |
1103 | want to have passed to the program, assume | |
1104 | SIGTRAP/SIGINT, which is GDB's default. */ | |
1105 | && (signo == TARGET_SIGNAL_TRAP || signo == TARGET_SIGNAL_INT)) | |
1106 | { | |
1107 | if (debug_threads) | |
1108 | fprintf (stderr, | |
1109 | "GPS: lwp %s had signal %s, " | |
1110 | "but we don't know if we should pass it. Default to not.\n", | |
1111 | target_pid_to_str (ptid_of (lp)), | |
1112 | target_signal_to_string (signo)); | |
1113 | return 0; | |
1114 | } | |
1115 | else | |
1116 | { | |
1117 | if (debug_threads) | |
1118 | fprintf (stderr, | |
1119 | "GPS: lwp %s has pending signal %s: delivering it.\n", | |
1120 | target_pid_to_str (ptid_of (lp)), | |
1121 | target_signal_to_string (signo)); | |
1122 | ||
1123 | return WSTOPSIG (status); | |
1124 | } | |
1125 | } | |
1126 | ||
95954743 PA |
1127 | static int |
1128 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1129 | { |
1130 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1131 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1132 | int pid = * (int *) args; |
9b224c5e | 1133 | int sig; |
95954743 PA |
1134 | |
1135 | if (ptid_get_pid (entry->id) != pid) | |
1136 | return 0; | |
6ad8ae5c | 1137 | |
9b224c5e | 1138 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1139 | if (lwp->stop_expected) |
ae13219e | 1140 | { |
9b224c5e PA |
1141 | if (debug_threads) |
1142 | fprintf (stderr, | |
1143 | "Sending SIGCONT to %s\n", | |
1144 | target_pid_to_str (ptid_of (lwp))); | |
1145 | ||
1146 | kill_lwp (lwpid_of (lwp), SIGCONT); | |
54a0b537 | 1147 | lwp->stop_expected = 0; |
ae13219e DJ |
1148 | } |
1149 | ||
1150 | /* Flush any pending changes to the process's registers. */ | |
1151 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 1152 | get_lwp_thread (lwp)); |
ae13219e | 1153 | |
9b224c5e PA |
1154 | /* Pass on any pending signal for this thread. */ |
1155 | sig = get_detach_signal (thread); | |
1156 | ||
ae13219e | 1157 | /* Finally, let it resume. */ |
82bfbe7e PA |
1158 | if (the_low_target.prepare_to_resume != NULL) |
1159 | the_low_target.prepare_to_resume (lwp); | |
9b224c5e PA |
1160 | if (ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, sig) < 0) |
1161 | error (_("Can't detach %s: %s"), | |
1162 | target_pid_to_str (ptid_of (lwp)), | |
1163 | strerror (errno)); | |
bd99dc85 PA |
1164 | |
1165 | delete_lwp (lwp); | |
95954743 | 1166 | return 0; |
6ad8ae5c DJ |
1167 | } |
1168 | ||
95954743 PA |
1169 | static int |
1170 | linux_detach (int pid) | |
1171 | { | |
1172 | struct process_info *process; | |
1173 | ||
1174 | process = find_process_pid (pid); | |
1175 | if (process == NULL) | |
1176 | return -1; | |
1177 | ||
f9e39928 PA |
1178 | /* Stop all threads before detaching. First, ptrace requires that |
1179 | the thread is stopped to sucessfully detach. Second, thread_db | |
1180 | may need to uninstall thread event breakpoints from memory, which | |
1181 | only works with a stopped process anyway. */ | |
7984d532 | 1182 | stop_all_lwps (0, NULL); |
f9e39928 | 1183 | |
ca5c370d | 1184 | #ifdef USE_THREAD_DB |
8336d594 | 1185 | thread_db_detach (process); |
ca5c370d PA |
1186 | #endif |
1187 | ||
fa593d66 PA |
1188 | /* Stabilize threads (move out of jump pads). */ |
1189 | stabilize_threads (); | |
1190 | ||
95954743 | 1191 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1192 | |
1193 | the_target->mourn (process); | |
f9e39928 PA |
1194 | |
1195 | /* Since we presently can only stop all lwps of all processes, we | |
1196 | need to unstop lwps of other processes. */ | |
7984d532 | 1197 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1198 | return 0; |
1199 | } | |
1200 | ||
1201 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1202 | ||
1203 | static int | |
1204 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1205 | { | |
1206 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1207 | struct process_info *process = proc; | |
1208 | ||
1209 | if (pid_of (lwp) == pid_of (process)) | |
1210 | delete_lwp (lwp); | |
1211 | ||
dd6953e1 | 1212 | return 0; |
6ad8ae5c DJ |
1213 | } |
1214 | ||
8336d594 PA |
1215 | static void |
1216 | linux_mourn (struct process_info *process) | |
1217 | { | |
1218 | struct process_info_private *priv; | |
1219 | ||
1220 | #ifdef USE_THREAD_DB | |
1221 | thread_db_mourn (process); | |
1222 | #endif | |
1223 | ||
f9e39928 PA |
1224 | find_inferior (&all_lwps, delete_lwp_callback, process); |
1225 | ||
8336d594 PA |
1226 | /* Freeing all private data. */ |
1227 | priv = process->private; | |
1228 | free (priv->arch_private); | |
1229 | free (priv); | |
1230 | process->private = NULL; | |
505106cd PA |
1231 | |
1232 | remove_process (process); | |
8336d594 PA |
1233 | } |
1234 | ||
444d6139 | 1235 | static void |
95954743 | 1236 | linux_join (int pid) |
444d6139 | 1237 | { |
444d6139 PA |
1238 | int status, ret; |
1239 | ||
1240 | do { | |
95954743 | 1241 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1242 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1243 | break; | |
1244 | } while (ret != -1 || errno != ECHILD); | |
1245 | } | |
1246 | ||
6ad8ae5c | 1247 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1248 | static int |
95954743 | 1249 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1250 | { |
95954743 PA |
1251 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1252 | ||
1253 | /* We assume we always know if a thread exits. If a whole process | |
1254 | exited but we still haven't been able to report it to GDB, we'll | |
1255 | hold on to the last lwp of the dead process. */ | |
1256 | if (lwp != NULL) | |
1257 | return !lwp->dead; | |
0d62e5e8 DJ |
1258 | else |
1259 | return 0; | |
1260 | } | |
1261 | ||
6bf5e0ba | 1262 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1263 | static int |
d50171e4 | 1264 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1265 | { |
54a0b537 | 1266 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1267 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1268 | struct thread_info *thread; |
95954743 PA |
1269 | |
1270 | /* Check if we're only interested in events from a specific process | |
1271 | or its lwps. */ | |
1272 | if (!ptid_equal (minus_one_ptid, ptid) | |
1273 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
1274 | return 0; | |
0d62e5e8 | 1275 | |
d50171e4 PA |
1276 | thread = get_lwp_thread (lwp); |
1277 | ||
1278 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1279 | report any status pending the LWP may have. */ | |
8336d594 | 1280 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1281 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1282 | return 0; |
0d62e5e8 | 1283 | |
d50171e4 | 1284 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1285 | } |
1286 | ||
95954743 PA |
1287 | static int |
1288 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1289 | { | |
1290 | ptid_t ptid = *(ptid_t *) data; | |
1291 | int lwp; | |
1292 | ||
1293 | if (ptid_get_lwp (ptid) != 0) | |
1294 | lwp = ptid_get_lwp (ptid); | |
1295 | else | |
1296 | lwp = ptid_get_pid (ptid); | |
1297 | ||
1298 | if (ptid_get_lwp (entry->id) == lwp) | |
1299 | return 1; | |
1300 | ||
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | struct lwp_info * | |
1305 | find_lwp_pid (ptid_t ptid) | |
1306 | { | |
1307 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1308 | } | |
1309 | ||
bd99dc85 | 1310 | static struct lwp_info * |
95954743 | 1311 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1312 | { |
0d62e5e8 | 1313 | int ret; |
95954743 | 1314 | int to_wait_for = -1; |
bd99dc85 | 1315 | struct lwp_info *child = NULL; |
0d62e5e8 | 1316 | |
bd99dc85 | 1317 | if (debug_threads) |
95954743 PA |
1318 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1319 | ||
1320 | if (ptid_equal (ptid, minus_one_ptid)) | |
1321 | to_wait_for = -1; /* any child */ | |
1322 | else | |
1323 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1324 | |
bd99dc85 | 1325 | options |= __WALL; |
0d62e5e8 | 1326 | |
bd99dc85 | 1327 | retry: |
0d62e5e8 | 1328 | |
bd99dc85 PA |
1329 | ret = my_waitpid (to_wait_for, wstatp, options); |
1330 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1331 | return NULL; | |
1332 | else if (ret == -1) | |
1333 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1334 | |
1335 | if (debug_threads | |
1336 | && (!WIFSTOPPED (*wstatp) | |
1337 | || (WSTOPSIG (*wstatp) != 32 | |
1338 | && WSTOPSIG (*wstatp) != 33))) | |
1339 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1340 | ||
95954743 | 1341 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1342 | |
24a09b5f DJ |
1343 | /* If we didn't find a process, one of two things presumably happened: |
1344 | - A process we started and then detached from has exited. Ignore it. | |
1345 | - A process we are controlling has forked and the new child's stop | |
1346 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1347 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f | 1348 | { |
05044653 | 1349 | add_to_pid_list (&stopped_pids, ret, *wstatp); |
24a09b5f DJ |
1350 | goto retry; |
1351 | } | |
bd99dc85 | 1352 | else if (child == NULL) |
24a09b5f DJ |
1353 | goto retry; |
1354 | ||
bd99dc85 | 1355 | child->stopped = 1; |
0d62e5e8 | 1356 | |
bd99dc85 | 1357 | child->last_status = *wstatp; |
32ca6d61 | 1358 | |
d61ddec4 UW |
1359 | /* Architecture-specific setup after inferior is running. |
1360 | This needs to happen after we have attached to the inferior | |
1361 | and it is stopped for the first time, but before we access | |
1362 | any inferior registers. */ | |
1363 | if (new_inferior) | |
1364 | { | |
1365 | the_low_target.arch_setup (); | |
52fa2412 UW |
1366 | #ifdef HAVE_LINUX_REGSETS |
1367 | memset (disabled_regsets, 0, num_regsets); | |
1368 | #endif | |
d61ddec4 UW |
1369 | new_inferior = 0; |
1370 | } | |
1371 | ||
c3adc08c PA |
1372 | /* Fetch the possibly triggered data watchpoint info and store it in |
1373 | CHILD. | |
1374 | ||
1375 | On some archs, like x86, that use debug registers to set | |
1376 | watchpoints, it's possible that the way to know which watched | |
1377 | address trapped, is to check the register that is used to select | |
1378 | which address to watch. Problem is, between setting the | |
1379 | watchpoint and reading back which data address trapped, the user | |
1380 | may change the set of watchpoints, and, as a consequence, GDB | |
1381 | changes the debug registers in the inferior. To avoid reading | |
1382 | back a stale stopped-data-address when that happens, we cache in | |
1383 | LP the fact that a watchpoint trapped, and the corresponding data | |
1384 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1385 | changes the debug registers meanwhile, we have the cached data we | |
1386 | can rely on. */ | |
1387 | ||
1388 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1389 | { | |
1390 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1391 | { | |
1392 | child->stopped_by_watchpoint = 0; | |
1393 | } | |
1394 | else | |
1395 | { | |
1396 | struct thread_info *saved_inferior; | |
1397 | ||
1398 | saved_inferior = current_inferior; | |
1399 | current_inferior = get_lwp_thread (child); | |
1400 | ||
1401 | child->stopped_by_watchpoint | |
1402 | = the_low_target.stopped_by_watchpoint (); | |
1403 | ||
1404 | if (child->stopped_by_watchpoint) | |
1405 | { | |
1406 | if (the_low_target.stopped_data_address != NULL) | |
1407 | child->stopped_data_address | |
1408 | = the_low_target.stopped_data_address (); | |
1409 | else | |
1410 | child->stopped_data_address = 0; | |
1411 | } | |
1412 | ||
1413 | current_inferior = saved_inferior; | |
1414 | } | |
1415 | } | |
1416 | ||
d50171e4 PA |
1417 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1418 | architecture being defined already (so that CHILD has a valid | |
1419 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1420 | not). */ | |
1421 | if (WIFSTOPPED (*wstatp)) | |
1422 | child->stop_pc = get_stop_pc (child); | |
1423 | ||
0d62e5e8 | 1424 | if (debug_threads |
47c0c975 DE |
1425 | && WIFSTOPPED (*wstatp) |
1426 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1427 | { |
896c7fbb | 1428 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1429 | struct regcache *regcache; |
47c0c975 DE |
1430 | CORE_ADDR pc; |
1431 | ||
d50171e4 | 1432 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1433 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1434 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1435 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1436 | current_inferior = saved_inferior; |
0d62e5e8 | 1437 | } |
bd99dc85 PA |
1438 | |
1439 | return child; | |
0d62e5e8 | 1440 | } |
611cb4a5 | 1441 | |
219f2f23 PA |
1442 | /* This function should only be called if the LWP got a SIGTRAP. |
1443 | ||
1444 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1445 | event was handled, 0 otherwise. */ | |
1446 | ||
1447 | static int | |
1448 | handle_tracepoints (struct lwp_info *lwp) | |
1449 | { | |
1450 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1451 | int tpoint_related_event = 0; | |
1452 | ||
7984d532 PA |
1453 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1454 | uninsert tracepoints. To do this, we temporarily pause all | |
1455 | threads, unpatch away, and then unpause threads. We need to make | |
1456 | sure the unpausing doesn't resume LWP too. */ | |
1457 | lwp->suspended++; | |
1458 | ||
219f2f23 PA |
1459 | /* And we need to be sure that any all-threads-stopping doesn't try |
1460 | to move threads out of the jump pads, as it could deadlock the | |
1461 | inferior (LWP could be in the jump pad, maybe even holding the | |
1462 | lock.) */ | |
1463 | ||
1464 | /* Do any necessary step collect actions. */ | |
1465 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1466 | ||
fa593d66 PA |
1467 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1468 | ||
219f2f23 PA |
1469 | /* See if we just hit a tracepoint and do its main collect |
1470 | actions. */ | |
1471 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1472 | ||
7984d532 PA |
1473 | lwp->suspended--; |
1474 | ||
1475 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1476 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1477 | |
219f2f23 PA |
1478 | if (tpoint_related_event) |
1479 | { | |
1480 | if (debug_threads) | |
1481 | fprintf (stderr, "got a tracepoint event\n"); | |
1482 | return 1; | |
1483 | } | |
1484 | ||
1485 | return 0; | |
1486 | } | |
1487 | ||
fa593d66 PA |
1488 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1489 | fast tracepoint. */ | |
1490 | ||
1491 | static int | |
1492 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1493 | struct fast_tpoint_collect_status *status) | |
1494 | { | |
1495 | CORE_ADDR thread_area; | |
1496 | ||
1497 | if (the_low_target.get_thread_area == NULL) | |
1498 | return 0; | |
1499 | ||
1500 | /* Get the thread area address. This is used to recognize which | |
1501 | thread is which when tracing with the in-process agent library. | |
1502 | We don't read anything from the address, and treat it as opaque; | |
1503 | it's the address itself that we assume is unique per-thread. */ | |
1504 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1505 | return 0; | |
1506 | ||
1507 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1508 | } | |
1509 | ||
1510 | /* The reason we resume in the caller, is because we want to be able | |
1511 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1512 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1513 | refuses to resume. */ | |
1514 | ||
1515 | static int | |
1516 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1517 | { | |
1518 | struct thread_info *saved_inferior; | |
1519 | ||
1520 | saved_inferior = current_inferior; | |
1521 | current_inferior = get_lwp_thread (lwp); | |
1522 | ||
1523 | if ((wstat == NULL | |
1524 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1525 | && supports_fast_tracepoints () | |
58b4daa5 | 1526 | && agent_loaded_p ()) |
fa593d66 PA |
1527 | { |
1528 | struct fast_tpoint_collect_status status; | |
1529 | int r; | |
1530 | ||
1531 | if (debug_threads) | |
1532 | fprintf (stderr, "\ | |
1533 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1534 | lwpid_of (lwp)); | |
1535 | ||
1536 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1537 | ||
1538 | if (wstat == NULL | |
1539 | || (WSTOPSIG (*wstat) != SIGILL | |
1540 | && WSTOPSIG (*wstat) != SIGFPE | |
1541 | && WSTOPSIG (*wstat) != SIGSEGV | |
1542 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1543 | { | |
1544 | lwp->collecting_fast_tracepoint = r; | |
1545 | ||
1546 | if (r != 0) | |
1547 | { | |
1548 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1549 | { | |
1550 | /* Haven't executed the original instruction yet. | |
1551 | Set breakpoint there, and wait till it's hit, | |
1552 | then single-step until exiting the jump pad. */ | |
1553 | lwp->exit_jump_pad_bkpt | |
1554 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1555 | } | |
1556 | ||
1557 | if (debug_threads) | |
1558 | fprintf (stderr, "\ | |
1559 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1560 | lwpid_of (lwp)); | |
0cccb683 | 1561 | current_inferior = saved_inferior; |
fa593d66 PA |
1562 | |
1563 | return 1; | |
1564 | } | |
1565 | } | |
1566 | else | |
1567 | { | |
1568 | /* If we get a synchronous signal while collecting, *and* | |
1569 | while executing the (relocated) original instruction, | |
1570 | reset the PC to point at the tpoint address, before | |
1571 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1572 | report the signal to GDB, and pray for the best. */ | |
1573 | ||
1574 | lwp->collecting_fast_tracepoint = 0; | |
1575 | ||
1576 | if (r != 0 | |
1577 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1578 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1579 | { | |
1580 | siginfo_t info; | |
1581 | struct regcache *regcache; | |
1582 | ||
1583 | /* The si_addr on a few signals references the address | |
1584 | of the faulting instruction. Adjust that as | |
1585 | well. */ | |
1586 | if ((WSTOPSIG (*wstat) == SIGILL | |
1587 | || WSTOPSIG (*wstat) == SIGFPE | |
1588 | || WSTOPSIG (*wstat) == SIGBUS | |
1589 | || WSTOPSIG (*wstat) == SIGSEGV) | |
1590 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &info) == 0 | |
1591 | /* Final check just to make sure we don't clobber | |
1592 | the siginfo of non-kernel-sent signals. */ | |
1593 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1594 | { | |
1595 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
1596 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &info); | |
1597 | } | |
1598 | ||
1599 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1600 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1601 | lwp->stop_pc = status.tpoint_addr; | |
1602 | ||
1603 | /* Cancel any fast tracepoint lock this thread was | |
1604 | holding. */ | |
1605 | force_unlock_trace_buffer (); | |
1606 | } | |
1607 | ||
1608 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1609 | { | |
1610 | if (debug_threads) | |
1611 | fprintf (stderr, | |
1612 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1613 | "stopping all threads momentarily.\n"); | |
1614 | ||
1615 | stop_all_lwps (1, lwp); | |
1616 | cancel_breakpoints (); | |
1617 | ||
1618 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1619 | lwp->exit_jump_pad_bkpt = NULL; | |
1620 | ||
1621 | unstop_all_lwps (1, lwp); | |
1622 | ||
1623 | gdb_assert (lwp->suspended >= 0); | |
1624 | } | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | if (debug_threads) | |
1629 | fprintf (stderr, "\ | |
1630 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1631 | lwpid_of (lwp)); | |
0cccb683 YQ |
1632 | |
1633 | current_inferior = saved_inferior; | |
fa593d66 PA |
1634 | return 0; |
1635 | } | |
1636 | ||
1637 | /* Enqueue one signal in the "signals to report later when out of the | |
1638 | jump pad" list. */ | |
1639 | ||
1640 | static void | |
1641 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1642 | { | |
1643 | struct pending_signals *p_sig; | |
1644 | ||
1645 | if (debug_threads) | |
1646 | fprintf (stderr, "\ | |
1647 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1648 | ||
1649 | if (debug_threads) | |
1650 | { | |
1651 | struct pending_signals *sig; | |
1652 | ||
1653 | for (sig = lwp->pending_signals_to_report; | |
1654 | sig != NULL; | |
1655 | sig = sig->prev) | |
1656 | fprintf (stderr, | |
1657 | " Already queued %d\n", | |
1658 | sig->signal); | |
1659 | ||
1660 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1661 | } | |
1662 | ||
1a981360 PA |
1663 | /* Don't enqueue non-RT signals if they are already in the deferred |
1664 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1665 | twice) */ | |
1666 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1667 | { | |
1668 | struct pending_signals *sig; | |
1669 | ||
1670 | for (sig = lwp->pending_signals_to_report; | |
1671 | sig != NULL; | |
1672 | sig = sig->prev) | |
1673 | { | |
1674 | if (sig->signal == WSTOPSIG (*wstat)) | |
1675 | { | |
1676 | if (debug_threads) | |
1677 | fprintf (stderr, | |
1678 | "Not requeuing already queued non-RT signal %d" | |
1679 | " for LWP %ld\n", | |
1680 | sig->signal, | |
1681 | lwpid_of (lwp)); | |
1682 | return; | |
1683 | } | |
1684 | } | |
1685 | } | |
1686 | ||
fa593d66 PA |
1687 | p_sig = xmalloc (sizeof (*p_sig)); |
1688 | p_sig->prev = lwp->pending_signals_to_report; | |
1689 | p_sig->signal = WSTOPSIG (*wstat); | |
1690 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1691 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1692 | ||
1693 | lwp->pending_signals_to_report = p_sig; | |
1694 | } | |
1695 | ||
1696 | /* Dequeue one signal from the "signals to report later when out of | |
1697 | the jump pad" list. */ | |
1698 | ||
1699 | static int | |
1700 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1701 | { | |
1702 | if (lwp->pending_signals_to_report != NULL) | |
1703 | { | |
1704 | struct pending_signals **p_sig; | |
1705 | ||
1706 | p_sig = &lwp->pending_signals_to_report; | |
1707 | while ((*p_sig)->prev != NULL) | |
1708 | p_sig = &(*p_sig)->prev; | |
1709 | ||
1710 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1711 | if ((*p_sig)->info.si_signo != 0) | |
1712 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); | |
1713 | free (*p_sig); | |
1714 | *p_sig = NULL; | |
1715 | ||
1716 | if (debug_threads) | |
1717 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1718 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1719 | ||
1720 | if (debug_threads) | |
1721 | { | |
1722 | struct pending_signals *sig; | |
1723 | ||
1724 | for (sig = lwp->pending_signals_to_report; | |
1725 | sig != NULL; | |
1726 | sig = sig->prev) | |
1727 | fprintf (stderr, | |
1728 | " Still queued %d\n", | |
1729 | sig->signal); | |
1730 | ||
1731 | fprintf (stderr, " (no more queued signals)\n"); | |
1732 | } | |
1733 | ||
1734 | return 1; | |
1735 | } | |
1736 | ||
1737 | return 0; | |
1738 | } | |
1739 | ||
d50171e4 PA |
1740 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1741 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1742 | will handle the current event, eventually we will resume this LWP, | |
1743 | and this breakpoint will trap again. */ | |
1744 | ||
1745 | static int | |
1746 | cancel_breakpoint (struct lwp_info *lwp) | |
1747 | { | |
1748 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1749 | |
1750 | /* There's nothing to do if we don't support breakpoints. */ | |
1751 | if (!supports_breakpoints ()) | |
1752 | return 0; | |
1753 | ||
d50171e4 PA |
1754 | /* breakpoint_at reads from current inferior. */ |
1755 | saved_inferior = current_inferior; | |
1756 | current_inferior = get_lwp_thread (lwp); | |
1757 | ||
1758 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1759 | { | |
1760 | if (debug_threads) | |
1761 | fprintf (stderr, | |
1762 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1763 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1764 | |
1765 | /* Back up the PC if necessary. */ | |
1766 | if (the_low_target.decr_pc_after_break) | |
1767 | { | |
1768 | struct regcache *regcache | |
fc7238bb | 1769 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1770 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1771 | } | |
1772 | ||
1773 | current_inferior = saved_inferior; | |
1774 | return 1; | |
1775 | } | |
1776 | else | |
1777 | { | |
1778 | if (debug_threads) | |
1779 | fprintf (stderr, | |
1780 | "CB: No breakpoint found at %s for [%s]\n", | |
1781 | paddress (lwp->stop_pc), | |
fc7238bb | 1782 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1783 | } |
1784 | ||
1785 | current_inferior = saved_inferior; | |
1786 | return 0; | |
1787 | } | |
1788 | ||
1789 | /* When the event-loop is doing a step-over, this points at the thread | |
1790 | being stepped. */ | |
1791 | ptid_t step_over_bkpt; | |
1792 | ||
bd99dc85 PA |
1793 | /* Wait for an event from child PID. If PID is -1, wait for any |
1794 | child. Store the stop status through the status pointer WSTAT. | |
1795 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1796 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1797 | the stopped child otherwise. */ | |
1798 | ||
0d62e5e8 | 1799 | static int |
d8301ad1 | 1800 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1801 | { |
d50171e4 | 1802 | struct lwp_info *event_child, *requested_child; |
d8301ad1 | 1803 | ptid_t wait_ptid; |
d50171e4 | 1804 | |
d50171e4 PA |
1805 | event_child = NULL; |
1806 | requested_child = NULL; | |
0d62e5e8 | 1807 | |
95954743 | 1808 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1809 | |
e825046f | 1810 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
0d62e5e8 | 1811 | { |
54a0b537 | 1812 | event_child = (struct lwp_info *) |
d50171e4 | 1813 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1814 | if (debug_threads && event_child) |
bd99dc85 | 1815 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1816 | } |
1817 | else | |
1818 | { | |
95954743 | 1819 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1820 | |
fa593d66 PA |
1821 | if (!stopping_threads |
1822 | && requested_child->status_pending_p | |
1823 | && requested_child->collecting_fast_tracepoint) | |
1824 | { | |
1825 | enqueue_one_deferred_signal (requested_child, | |
1826 | &requested_child->status_pending); | |
1827 | requested_child->status_pending_p = 0; | |
1828 | requested_child->status_pending = 0; | |
1829 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1830 | } | |
1831 | ||
1832 | if (requested_child->suspended | |
1833 | && requested_child->status_pending_p) | |
1834 | fatal ("requesting an event out of a suspended child?"); | |
1835 | ||
d50171e4 | 1836 | if (requested_child->status_pending_p) |
bd99dc85 | 1837 | event_child = requested_child; |
0d62e5e8 | 1838 | } |
611cb4a5 | 1839 | |
0d62e5e8 DJ |
1840 | if (event_child != NULL) |
1841 | { | |
bd99dc85 PA |
1842 | if (debug_threads) |
1843 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1844 | lwpid_of (event_child), event_child->status_pending); | |
1845 | *wstat = event_child->status_pending; | |
1846 | event_child->status_pending_p = 0; | |
1847 | event_child->status_pending = 0; | |
1848 | current_inferior = get_lwp_thread (event_child); | |
1849 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1850 | } |
1851 | ||
d8301ad1 JK |
1852 | if (ptid_is_pid (ptid)) |
1853 | { | |
1854 | /* A request to wait for a specific tgid. This is not possible | |
1855 | with waitpid, so instead, we wait for any child, and leave | |
1856 | children we're not interested in right now with a pending | |
1857 | status to report later. */ | |
1858 | wait_ptid = minus_one_ptid; | |
1859 | } | |
1860 | else | |
1861 | wait_ptid = ptid; | |
1862 | ||
0d62e5e8 DJ |
1863 | /* We only enter this loop if no process has a pending wait status. Thus |
1864 | any action taken in response to a wait status inside this loop is | |
1865 | responding as soon as we detect the status, not after any pending | |
1866 | events. */ | |
1867 | while (1) | |
1868 | { | |
d8301ad1 | 1869 | event_child = linux_wait_for_lwp (wait_ptid, wstat, options); |
0d62e5e8 | 1870 | |
bd99dc85 | 1871 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1872 | { |
1873 | if (debug_threads) | |
1874 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1875 | return 0; | |
1876 | } | |
0d62e5e8 DJ |
1877 | |
1878 | if (event_child == NULL) | |
1879 | error ("event from unknown child"); | |
611cb4a5 | 1880 | |
d8301ad1 JK |
1881 | if (ptid_is_pid (ptid) |
1882 | && ptid_get_pid (ptid) != ptid_get_pid (ptid_of (event_child))) | |
1883 | { | |
1884 | if (! WIFSTOPPED (*wstat)) | |
1885 | mark_lwp_dead (event_child, *wstat); | |
1886 | else | |
1887 | { | |
1888 | event_child->status_pending_p = 1; | |
1889 | event_child->status_pending = *wstat; | |
1890 | } | |
1891 | continue; | |
1892 | } | |
1893 | ||
bd99dc85 | 1894 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1895 | |
89be2091 | 1896 | /* Check for thread exit. */ |
bd99dc85 | 1897 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1898 | { |
89be2091 | 1899 | if (debug_threads) |
95954743 | 1900 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1901 | |
1902 | /* If the last thread is exiting, just return. */ | |
95954743 | 1903 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1904 | { |
1905 | if (debug_threads) | |
95954743 PA |
1906 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1907 | lwpid_of (event_child)); | |
bd99dc85 PA |
1908 | return lwpid_of (event_child); |
1909 | } | |
89be2091 | 1910 | |
bd99dc85 PA |
1911 | if (!non_stop) |
1912 | { | |
1913 | current_inferior = (struct thread_info *) all_threads.head; | |
1914 | if (debug_threads) | |
1915 | fprintf (stderr, "Current inferior is now %ld\n", | |
1916 | lwpid_of (get_thread_lwp (current_inferior))); | |
1917 | } | |
1918 | else | |
1919 | { | |
1920 | current_inferior = NULL; | |
1921 | if (debug_threads) | |
1922 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1923 | } | |
89be2091 DJ |
1924 | |
1925 | /* If we were waiting for this particular child to do something... | |
1926 | well, it did something. */ | |
bd99dc85 | 1927 | if (requested_child != NULL) |
d50171e4 PA |
1928 | { |
1929 | int lwpid = lwpid_of (event_child); | |
1930 | ||
1931 | /* Cancel the step-over operation --- the thread that | |
1932 | started it is gone. */ | |
1933 | if (finish_step_over (event_child)) | |
7984d532 | 1934 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1935 | delete_lwp (event_child); |
1936 | return lwpid; | |
1937 | } | |
1938 | ||
1939 | delete_lwp (event_child); | |
89be2091 DJ |
1940 | |
1941 | /* Wait for a more interesting event. */ | |
1942 | continue; | |
1943 | } | |
1944 | ||
a6dbe5df PA |
1945 | if (event_child->must_set_ptrace_flags) |
1946 | { | |
1e7fc18c | 1947 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1948 | event_child->must_set_ptrace_flags = 0; |
1949 | } | |
1950 | ||
bd99dc85 PA |
1951 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1952 | && *wstat >> 16 != 0) | |
24a09b5f | 1953 | { |
bd99dc85 | 1954 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1955 | continue; |
1956 | } | |
1957 | ||
d50171e4 PA |
1958 | if (WIFSTOPPED (*wstat) |
1959 | && WSTOPSIG (*wstat) == SIGSTOP | |
1960 | && event_child->stop_expected) | |
1961 | { | |
1962 | int should_stop; | |
1963 | ||
1964 | if (debug_threads) | |
1965 | fprintf (stderr, "Expected stop.\n"); | |
1966 | event_child->stop_expected = 0; | |
1967 | ||
8336d594 | 1968 | should_stop = (current_inferior->last_resume_kind == resume_stop |
d50171e4 PA |
1969 | || stopping_threads); |
1970 | ||
1971 | if (!should_stop) | |
1972 | { | |
1973 | linux_resume_one_lwp (event_child, | |
1974 | event_child->stepping, 0, NULL); | |
1975 | continue; | |
1976 | } | |
1977 | } | |
1978 | ||
bd99dc85 | 1979 | return lwpid_of (event_child); |
611cb4a5 | 1980 | } |
0d62e5e8 | 1981 | |
611cb4a5 DJ |
1982 | /* NOTREACHED */ |
1983 | return 0; | |
1984 | } | |
1985 | ||
6bf5e0ba PA |
1986 | /* Count the LWP's that have had events. */ |
1987 | ||
1988 | static int | |
1989 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1990 | { | |
1991 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1992 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1993 | int *count = data; |
1994 | ||
1995 | gdb_assert (count != NULL); | |
1996 | ||
1997 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1998 | should be reported to GDB. */ | |
8336d594 PA |
1999 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2000 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
2001 | && lp->status_pending_p |
2002 | && WIFSTOPPED (lp->status_pending) | |
2003 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2004 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2005 | (*count)++; | |
2006 | ||
2007 | return 0; | |
2008 | } | |
2009 | ||
2010 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2011 | ||
2012 | static int | |
2013 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2014 | { | |
2015 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2016 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 2017 | |
8336d594 PA |
2018 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2019 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2020 | && lp->status_pending_p) |
2021 | return 1; | |
2022 | else | |
2023 | return 0; | |
2024 | } | |
2025 | ||
2026 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2027 | reported to GDB. */ | |
2028 | ||
2029 | static int | |
2030 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2031 | { | |
2032 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2033 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2034 | int *selector = data; |
2035 | ||
2036 | gdb_assert (selector != NULL); | |
2037 | ||
2038 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
2039 | if (thread->last_resume_kind != resume_stop |
2040 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2041 | && lp->status_pending_p |
2042 | && WIFSTOPPED (lp->status_pending) | |
2043 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2044 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2045 | if ((*selector)-- == 0) | |
2046 | return 1; | |
2047 | ||
2048 | return 0; | |
2049 | } | |
2050 | ||
2051 | static int | |
2052 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
2053 | { | |
2054 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2055 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2056 | struct lwp_info *event_lp = data; |
2057 | ||
2058 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2059 | if (lp == event_lp) | |
2060 | return 0; | |
2061 | ||
2062 | /* If a LWP other than the LWP that we're reporting an event for has | |
2063 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2064 | then just arrange for it to hit it again later. We don't keep | |
2065 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2066 | LWP. We will handle the current event, eventually we will resume | |
2067 | all LWPs, and this one will get its breakpoint trap again. | |
2068 | ||
2069 | If we do not do this, then we run the risk that the user will | |
2070 | delete or disable the breakpoint, but the LWP will have already | |
2071 | tripped on it. */ | |
2072 | ||
8336d594 PA |
2073 | if (thread->last_resume_kind != resume_stop |
2074 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2075 | && lp->status_pending_p |
2076 | && WIFSTOPPED (lp->status_pending) | |
2077 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
2078 | && !lp->stepping |
2079 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
2080 | && cancel_breakpoint (lp)) |
2081 | /* Throw away the SIGTRAP. */ | |
2082 | lp->status_pending_p = 0; | |
2083 | ||
2084 | return 0; | |
2085 | } | |
2086 | ||
7984d532 PA |
2087 | static void |
2088 | linux_cancel_breakpoints (void) | |
2089 | { | |
2090 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
2091 | } | |
2092 | ||
6bf5e0ba PA |
2093 | /* Select one LWP out of those that have events pending. */ |
2094 | ||
2095 | static void | |
2096 | select_event_lwp (struct lwp_info **orig_lp) | |
2097 | { | |
2098 | int num_events = 0; | |
2099 | int random_selector; | |
2100 | struct lwp_info *event_lp; | |
2101 | ||
2102 | /* Give preference to any LWP that is being single-stepped. */ | |
2103 | event_lp | |
2104 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2105 | select_singlestep_lwp_callback, NULL); | |
2106 | if (event_lp != NULL) | |
2107 | { | |
2108 | if (debug_threads) | |
2109 | fprintf (stderr, | |
2110 | "SEL: Select single-step %s\n", | |
2111 | target_pid_to_str (ptid_of (event_lp))); | |
2112 | } | |
2113 | else | |
2114 | { | |
2115 | /* No single-stepping LWP. Select one at random, out of those | |
2116 | which have had SIGTRAP events. */ | |
2117 | ||
2118 | /* First see how many SIGTRAP events we have. */ | |
2119 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
2120 | ||
2121 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2122 | random_selector = (int) | |
2123 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2124 | ||
2125 | if (debug_threads && num_events > 1) | |
2126 | fprintf (stderr, | |
2127 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2128 | num_events, random_selector); | |
2129 | ||
2130 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
2131 | select_event_lwp_callback, | |
2132 | &random_selector); | |
2133 | } | |
2134 | ||
2135 | if (event_lp != NULL) | |
2136 | { | |
2137 | /* Switch the event LWP. */ | |
2138 | *orig_lp = event_lp; | |
2139 | } | |
2140 | } | |
2141 | ||
7984d532 PA |
2142 | /* Decrement the suspend count of an LWP. */ |
2143 | ||
2144 | static int | |
2145 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2146 | { | |
2147 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2148 | ||
2149 | /* Ignore EXCEPT. */ | |
2150 | if (lwp == except) | |
2151 | return 0; | |
2152 | ||
2153 | lwp->suspended--; | |
2154 | ||
2155 | gdb_assert (lwp->suspended >= 0); | |
2156 | return 0; | |
2157 | } | |
2158 | ||
2159 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2160 | NULL. */ | |
2161 | ||
2162 | static void | |
2163 | unsuspend_all_lwps (struct lwp_info *except) | |
2164 | { | |
2165 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
2166 | } | |
2167 | ||
fa593d66 PA |
2168 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2169 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2170 | void *data); | |
2171 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2172 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2173 | struct target_waitstatus *ourstatus, | |
2174 | int target_options); | |
2175 | ||
2176 | /* Stabilize threads (move out of jump pads). | |
2177 | ||
2178 | If a thread is midway collecting a fast tracepoint, we need to | |
2179 | finish the collection and move it out of the jump pad before | |
2180 | reporting the signal. | |
2181 | ||
2182 | This avoids recursion while collecting (when a signal arrives | |
2183 | midway, and the signal handler itself collects), which would trash | |
2184 | the trace buffer. In case the user set a breakpoint in a signal | |
2185 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2186 | Most importantly, there are certain things we can't do safely if | |
2187 | threads are stopped in a jump pad (or in its callee's). For | |
2188 | example: | |
2189 | ||
2190 | - starting a new trace run. A thread still collecting the | |
2191 | previous run, could trash the trace buffer when resumed. The trace | |
2192 | buffer control structures would have been reset but the thread had | |
2193 | no way to tell. The thread could even midway memcpy'ing to the | |
2194 | buffer, which would mean that when resumed, it would clobber the | |
2195 | trace buffer that had been set for a new run. | |
2196 | ||
2197 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2198 | safely. Say you do tstart while a thread is stopped midway while | |
2199 | collecting. When the thread is later resumed, it finishes the | |
2200 | collection, and returns to the jump pad, to execute the original | |
2201 | instruction that was under the tracepoint jump at the time the | |
2202 | older run had been started. If the jump pad had been rewritten | |
2203 | since for something else in the new run, the thread would now | |
2204 | execute the wrong / random instructions. */ | |
2205 | ||
2206 | static void | |
2207 | linux_stabilize_threads (void) | |
2208 | { | |
2209 | struct thread_info *save_inferior; | |
2210 | struct lwp_info *lwp_stuck; | |
2211 | ||
2212 | lwp_stuck | |
2213 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2214 | stuck_in_jump_pad_callback, NULL); | |
2215 | if (lwp_stuck != NULL) | |
2216 | { | |
b4d51a55 PA |
2217 | if (debug_threads) |
2218 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
2219 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2220 | return; |
2221 | } | |
2222 | ||
2223 | save_inferior = current_inferior; | |
2224 | ||
2225 | stabilizing_threads = 1; | |
2226 | ||
2227 | /* Kick 'em all. */ | |
2228 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2229 | ||
2230 | /* Loop until all are stopped out of the jump pads. */ | |
2231 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2232 | { | |
2233 | struct target_waitstatus ourstatus; | |
2234 | struct lwp_info *lwp; | |
fa593d66 PA |
2235 | int wstat; |
2236 | ||
2237 | /* Note that we go through the full wait even loop. While | |
2238 | moving threads out of jump pad, we need to be able to step | |
2239 | over internal breakpoints and such. */ | |
32fcada3 | 2240 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2241 | |
2242 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2243 | { | |
2244 | lwp = get_thread_lwp (current_inferior); | |
2245 | ||
2246 | /* Lock it. */ | |
2247 | lwp->suspended++; | |
2248 | ||
2249 | if (ourstatus.value.sig != TARGET_SIGNAL_0 | |
2250 | || current_inferior->last_resume_kind == resume_stop) | |
2251 | { | |
2252 | wstat = W_STOPCODE (target_signal_to_host (ourstatus.value.sig)); | |
2253 | enqueue_one_deferred_signal (lwp, &wstat); | |
2254 | } | |
2255 | } | |
2256 | } | |
2257 | ||
2258 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2259 | ||
2260 | stabilizing_threads = 0; | |
2261 | ||
2262 | current_inferior = save_inferior; | |
2263 | ||
b4d51a55 | 2264 | if (debug_threads) |
fa593d66 | 2265 | { |
b4d51a55 PA |
2266 | lwp_stuck |
2267 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2268 | stuck_in_jump_pad_callback, NULL); | |
2269 | if (lwp_stuck != NULL) | |
fa593d66 PA |
2270 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2271 | lwpid_of (lwp_stuck)); | |
2272 | } | |
2273 | } | |
2274 | ||
0d62e5e8 | 2275 | /* Wait for process, returns status. */ |
da6d8c04 | 2276 | |
95954743 PA |
2277 | static ptid_t |
2278 | linux_wait_1 (ptid_t ptid, | |
2279 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2280 | { |
e5f1222d | 2281 | int w; |
fc7238bb | 2282 | struct lwp_info *event_child; |
bd99dc85 | 2283 | int options; |
bd99dc85 | 2284 | int pid; |
6bf5e0ba PA |
2285 | int step_over_finished; |
2286 | int bp_explains_trap; | |
2287 | int maybe_internal_trap; | |
2288 | int report_to_gdb; | |
219f2f23 | 2289 | int trace_event; |
bd99dc85 PA |
2290 | |
2291 | /* Translate generic target options into linux options. */ | |
2292 | options = __WALL; | |
2293 | if (target_options & TARGET_WNOHANG) | |
2294 | options |= WNOHANG; | |
0d62e5e8 DJ |
2295 | |
2296 | retry: | |
fa593d66 PA |
2297 | bp_explains_trap = 0; |
2298 | trace_event = 0; | |
bd99dc85 PA |
2299 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2300 | ||
0d62e5e8 DJ |
2301 | /* If we were only supposed to resume one thread, only wait for |
2302 | that thread - if it's still alive. If it died, however - which | |
2303 | can happen if we're coming from the thread death case below - | |
2304 | then we need to make sure we restart the other threads. We could | |
2305 | pick a thread at random or restart all; restarting all is less | |
2306 | arbitrary. */ | |
95954743 PA |
2307 | if (!non_stop |
2308 | && !ptid_equal (cont_thread, null_ptid) | |
2309 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2310 | { |
fc7238bb PA |
2311 | struct thread_info *thread; |
2312 | ||
bd99dc85 PA |
2313 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2314 | cont_thread); | |
0d62e5e8 DJ |
2315 | |
2316 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2317 | if (thread == NULL) |
64386c31 DJ |
2318 | { |
2319 | struct thread_resume resume_info; | |
95954743 | 2320 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2321 | resume_info.kind = resume_continue; |
2322 | resume_info.sig = 0; | |
2bd7c093 | 2323 | linux_resume (&resume_info, 1); |
64386c31 | 2324 | } |
bd99dc85 | 2325 | else |
95954743 | 2326 | ptid = cont_thread; |
0d62e5e8 | 2327 | } |
da6d8c04 | 2328 | |
6bf5e0ba PA |
2329 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2330 | pid = linux_wait_for_event (ptid, &w, options); | |
2331 | else | |
2332 | { | |
2333 | if (debug_threads) | |
2334 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2335 | target_pid_to_str (step_over_bkpt)); | |
2336 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2337 | } | |
2338 | ||
bd99dc85 | 2339 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2340 | return null_ptid; |
bd99dc85 | 2341 | |
6bf5e0ba | 2342 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2343 | |
0d62e5e8 DJ |
2344 | /* If we are waiting for a particular child, and it exited, |
2345 | linux_wait_for_event will return its exit status. Similarly if | |
2346 | the last child exited. If this is not the last child, however, | |
2347 | do not report it as exited until there is a 'thread exited' response | |
2348 | available in the remote protocol. Instead, just wait for another event. | |
2349 | This should be safe, because if the thread crashed we will already | |
2350 | have reported the termination signal to GDB; that should stop any | |
2351 | in-progress stepping operations, etc. | |
2352 | ||
2353 | Report the exit status of the last thread to exit. This matches | |
2354 | LinuxThreads' behavior. */ | |
2355 | ||
95954743 | 2356 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2357 | { |
bd99dc85 | 2358 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2359 | { |
bd99dc85 PA |
2360 | if (WIFEXITED (w)) |
2361 | { | |
2362 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2363 | ourstatus->value.integer = WEXITSTATUS (w); | |
2364 | ||
2365 | if (debug_threads) | |
493e2a69 MS |
2366 | fprintf (stderr, |
2367 | "\nChild exited with retcode = %x \n", | |
2368 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2369 | } |
2370 | else | |
2371 | { | |
2372 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2373 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
2374 | ||
2375 | if (debug_threads) | |
493e2a69 MS |
2376 | fprintf (stderr, |
2377 | "\nChild terminated with signal = %x \n", | |
2378 | WTERMSIG (w)); | |
bd99dc85 PA |
2379 | |
2380 | } | |
5b1c542e | 2381 | |
3e4c1235 | 2382 | return ptid_of (event_child); |
0d62e5e8 | 2383 | } |
da6d8c04 | 2384 | } |
0d62e5e8 | 2385 | else |
da6d8c04 | 2386 | { |
0d62e5e8 DJ |
2387 | if (!WIFSTOPPED (w)) |
2388 | goto retry; | |
da6d8c04 DJ |
2389 | } |
2390 | ||
6bf5e0ba PA |
2391 | /* If this event was not handled before, and is not a SIGTRAP, we |
2392 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2393 | a breakpoint is inserted at the current PC. If this target does | |
2394 | not support internal breakpoints at all, we also report the | |
2395 | SIGTRAP without further processing; it's of no concern to us. */ | |
2396 | maybe_internal_trap | |
2397 | = (supports_breakpoints () | |
2398 | && (WSTOPSIG (w) == SIGTRAP | |
2399 | || ((WSTOPSIG (w) == SIGILL | |
2400 | || WSTOPSIG (w) == SIGSEGV) | |
2401 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2402 | ||
2403 | if (maybe_internal_trap) | |
2404 | { | |
2405 | /* Handle anything that requires bookkeeping before deciding to | |
2406 | report the event or continue waiting. */ | |
2407 | ||
2408 | /* First check if we can explain the SIGTRAP with an internal | |
2409 | breakpoint, or if we should possibly report the event to GDB. | |
2410 | Do this before anything that may remove or insert a | |
2411 | breakpoint. */ | |
2412 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2413 | ||
2414 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2415 | finished. If so, tweak the state machine accordingly, | |
2416 | reinsert breakpoints and delete any reinsert (software | |
2417 | single-step) breakpoints. */ | |
2418 | step_over_finished = finish_step_over (event_child); | |
2419 | ||
2420 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2421 | check_breakpoints (event_child->stop_pc); | |
2422 | ||
219f2f23 PA |
2423 | /* Handle tracepoint data collecting. This may overflow the |
2424 | trace buffer, and cause a tracing stop, removing | |
2425 | breakpoints. */ | |
2426 | trace_event = handle_tracepoints (event_child); | |
2427 | ||
6bf5e0ba PA |
2428 | if (bp_explains_trap) |
2429 | { | |
2430 | /* If we stepped or ran into an internal breakpoint, we've | |
2431 | already handled it. So next time we resume (from this | |
2432 | PC), we should step over it. */ | |
2433 | if (debug_threads) | |
2434 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2435 | ||
8b07ae33 PA |
2436 | if (breakpoint_here (event_child->stop_pc)) |
2437 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2438 | } |
2439 | } | |
2440 | else | |
2441 | { | |
2442 | /* We have some other signal, possibly a step-over dance was in | |
2443 | progress, and it should be cancelled too. */ | |
2444 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2445 | } |
2446 | ||
2447 | /* We have all the data we need. Either report the event to GDB, or | |
2448 | resume threads and keep waiting for more. */ | |
2449 | ||
2450 | /* If we're collecting a fast tracepoint, finish the collection and | |
2451 | move out of the jump pad before delivering a signal. See | |
2452 | linux_stabilize_threads. */ | |
2453 | ||
2454 | if (WIFSTOPPED (w) | |
2455 | && WSTOPSIG (w) != SIGTRAP | |
2456 | && supports_fast_tracepoints () | |
58b4daa5 | 2457 | && agent_loaded_p ()) |
fa593d66 PA |
2458 | { |
2459 | if (debug_threads) | |
2460 | fprintf (stderr, | |
2461 | "Got signal %d for LWP %ld. Check if we need " | |
2462 | "to defer or adjust it.\n", | |
2463 | WSTOPSIG (w), lwpid_of (event_child)); | |
2464 | ||
2465 | /* Allow debugging the jump pad itself. */ | |
2466 | if (current_inferior->last_resume_kind != resume_step | |
2467 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2468 | { | |
2469 | enqueue_one_deferred_signal (event_child, &w); | |
2470 | ||
2471 | if (debug_threads) | |
2472 | fprintf (stderr, | |
2473 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2474 | WSTOPSIG (w), lwpid_of (event_child)); | |
2475 | ||
2476 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2477 | goto retry; | |
2478 | } | |
2479 | } | |
219f2f23 | 2480 | |
fa593d66 PA |
2481 | if (event_child->collecting_fast_tracepoint) |
2482 | { | |
2483 | if (debug_threads) | |
2484 | fprintf (stderr, "\ | |
2485 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2486 | Check if we're already there.\n", | |
2487 | lwpid_of (event_child), | |
2488 | event_child->collecting_fast_tracepoint); | |
2489 | ||
2490 | trace_event = 1; | |
2491 | ||
2492 | event_child->collecting_fast_tracepoint | |
2493 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2494 | ||
2495 | if (event_child->collecting_fast_tracepoint != 1) | |
2496 | { | |
2497 | /* No longer need this breakpoint. */ | |
2498 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2499 | { | |
2500 | if (debug_threads) | |
2501 | fprintf (stderr, | |
2502 | "No longer need exit-jump-pad bkpt; removing it." | |
2503 | "stopping all threads momentarily.\n"); | |
2504 | ||
2505 | /* Other running threads could hit this breakpoint. | |
2506 | We don't handle moribund locations like GDB does, | |
2507 | instead we always pause all threads when removing | |
2508 | breakpoints, so that any step-over or | |
2509 | decr_pc_after_break adjustment is always taken | |
2510 | care of while the breakpoint is still | |
2511 | inserted. */ | |
2512 | stop_all_lwps (1, event_child); | |
2513 | cancel_breakpoints (); | |
2514 | ||
2515 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2516 | event_child->exit_jump_pad_bkpt = NULL; | |
2517 | ||
2518 | unstop_all_lwps (1, event_child); | |
2519 | ||
2520 | gdb_assert (event_child->suspended >= 0); | |
2521 | } | |
2522 | } | |
2523 | ||
2524 | if (event_child->collecting_fast_tracepoint == 0) | |
2525 | { | |
2526 | if (debug_threads) | |
2527 | fprintf (stderr, | |
2528 | "fast tracepoint finished " | |
2529 | "collecting successfully.\n"); | |
2530 | ||
2531 | /* We may have a deferred signal to report. */ | |
2532 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2533 | { | |
2534 | if (debug_threads) | |
2535 | fprintf (stderr, "dequeued one signal.\n"); | |
2536 | } | |
3c11dd79 | 2537 | else |
fa593d66 | 2538 | { |
3c11dd79 PA |
2539 | if (debug_threads) |
2540 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2541 | |
2542 | if (stabilizing_threads) | |
2543 | { | |
2544 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
2545 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2546 | return ptid_of (event_child); | |
2547 | } | |
2548 | } | |
2549 | } | |
6bf5e0ba PA |
2550 | } |
2551 | ||
e471f25b PA |
2552 | /* Check whether GDB would be interested in this event. */ |
2553 | ||
2554 | /* If GDB is not interested in this signal, don't stop other | |
2555 | threads, and don't report it to GDB. Just resume the inferior | |
2556 | right away. We do this for threading-related signals as well as | |
2557 | any that GDB specifically requested we ignore. But never ignore | |
2558 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2559 | stepping - they may require special handling to skip the signal | |
2560 | handler. */ | |
2561 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2562 | thread library? */ | |
2563 | if (WIFSTOPPED (w) | |
2564 | && current_inferior->last_resume_kind != resume_step | |
2565 | && ( | |
1a981360 | 2566 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2567 | (current_process ()->private->thread_db != NULL |
2568 | && (WSTOPSIG (w) == __SIGRTMIN | |
2569 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2570 | || | |
2571 | #endif | |
2572 | (pass_signals[target_signal_from_host (WSTOPSIG (w))] | |
2573 | && !(WSTOPSIG (w) == SIGSTOP | |
2574 | && current_inferior->last_resume_kind == resume_stop)))) | |
2575 | { | |
2576 | siginfo_t info, *info_p; | |
2577 | ||
2578 | if (debug_threads) | |
2579 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2580 | WSTOPSIG (w), lwpid_of (event_child)); | |
2581 | ||
2582 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) | |
2583 | info_p = &info; | |
2584 | else | |
2585 | info_p = NULL; | |
2586 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2587 | WSTOPSIG (w), info_p); | |
2588 | goto retry; | |
2589 | } | |
2590 | ||
2591 | /* If GDB wanted this thread to single step, we always want to | |
2592 | report the SIGTRAP, and let GDB handle it. Watchpoints should | |
2593 | always be reported. So should signals we can't explain. A | |
2594 | SIGTRAP we can't explain could be a GDB breakpoint --- we may or | |
2595 | not support Z0 breakpoints. If we do, we're be able to handle | |
2596 | GDB breakpoints on top of internal breakpoints, by handling the | |
2597 | internal breakpoint and still reporting the event to GDB. If we | |
2598 | don't, we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 2599 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 2600 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 2601 | || event_child->stopped_by_watchpoint |
493e2a69 MS |
2602 | || (!step_over_finished |
2603 | && !bp_explains_trap && !trace_event) | |
9f3a5c85 LM |
2604 | || (gdb_breakpoint_here (event_child->stop_pc) |
2605 | && gdb_condition_true_at_breakpoint (event_child->stop_pc))); | |
6bf5e0ba PA |
2606 | |
2607 | /* We found no reason GDB would want us to stop. We either hit one | |
2608 | of our own breakpoints, or finished an internal step GDB | |
2609 | shouldn't know about. */ | |
2610 | if (!report_to_gdb) | |
2611 | { | |
2612 | if (debug_threads) | |
2613 | { | |
2614 | if (bp_explains_trap) | |
2615 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2616 | if (step_over_finished) | |
2617 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2618 | if (trace_event) |
2619 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
2620 | } |
2621 | ||
2622 | /* We're not reporting this breakpoint to GDB, so apply the | |
2623 | decr_pc_after_break adjustment to the inferior's regcache | |
2624 | ourselves. */ | |
2625 | ||
2626 | if (the_low_target.set_pc != NULL) | |
2627 | { | |
2628 | struct regcache *regcache | |
2629 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2630 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2631 | } | |
2632 | ||
7984d532 PA |
2633 | /* We may have finished stepping over a breakpoint. If so, |
2634 | we've stopped and suspended all LWPs momentarily except the | |
2635 | stepping one. This is where we resume them all again. We're | |
2636 | going to keep waiting, so use proceed, which handles stepping | |
2637 | over the next breakpoint. */ | |
6bf5e0ba PA |
2638 | if (debug_threads) |
2639 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2640 | |
2641 | if (step_over_finished) | |
2642 | unsuspend_all_lwps (event_child); | |
2643 | ||
6bf5e0ba PA |
2644 | proceed_all_lwps (); |
2645 | goto retry; | |
2646 | } | |
2647 | ||
2648 | if (debug_threads) | |
2649 | { | |
8336d594 | 2650 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
2651 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
2652 | if (event_child->stopped_by_watchpoint) | |
2653 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2654 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2655 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2656 | if (debug_threads) |
2657 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2658 | } | |
2659 | ||
2660 | /* Alright, we're going to report a stop. */ | |
2661 | ||
fa593d66 | 2662 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2663 | { |
2664 | /* In all-stop, stop all threads. */ | |
7984d532 | 2665 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2666 | |
2667 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2668 | from among those that have had events. Giving equal priority | |
2669 | to all LWPs that have had events helps prevent | |
2670 | starvation. */ | |
2671 | if (ptid_equal (ptid, minus_one_ptid)) | |
2672 | { | |
2673 | event_child->status_pending_p = 1; | |
2674 | event_child->status_pending = w; | |
2675 | ||
2676 | select_event_lwp (&event_child); | |
2677 | ||
2678 | event_child->status_pending_p = 0; | |
2679 | w = event_child->status_pending; | |
2680 | } | |
2681 | ||
2682 | /* Now that we've selected our final event LWP, cancel any | |
2683 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2684 | See the comment in cancel_breakpoints_callback to find out | |
2685 | why. */ | |
2686 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 | 2687 | |
c03e6ccc YQ |
2688 | /* If we were going a step-over, all other threads but the stepping one |
2689 | had been paused in start_step_over, with their suspend counts | |
2690 | incremented. We don't want to do a full unstop/unpause, because we're | |
2691 | in all-stop mode (so we want threads stopped), but we still need to | |
2692 | unsuspend the other threads, to decrement their `suspended' count | |
2693 | back. */ | |
2694 | if (step_over_finished) | |
2695 | unsuspend_all_lwps (event_child); | |
2696 | ||
fa593d66 PA |
2697 | /* Stabilize threads (move out of jump pads). */ |
2698 | stabilize_threads (); | |
6bf5e0ba PA |
2699 | } |
2700 | else | |
2701 | { | |
2702 | /* If we just finished a step-over, then all threads had been | |
2703 | momentarily paused. In all-stop, that's fine, we want | |
2704 | threads stopped by now anyway. In non-stop, we need to | |
2705 | re-resume threads that GDB wanted to be running. */ | |
2706 | if (step_over_finished) | |
7984d532 | 2707 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2708 | } |
2709 | ||
5b1c542e | 2710 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2711 | |
8336d594 PA |
2712 | if (current_inferior->last_resume_kind == resume_stop |
2713 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2714 | { |
2715 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2716 | and it stopped cleanly, so report as SIG0. The use of | |
2717 | SIGSTOP is an implementation detail. */ | |
2718 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2719 | } | |
8336d594 PA |
2720 | else if (current_inferior->last_resume_kind == resume_stop |
2721 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2722 | { |
2723 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2724 | but, it stopped for other reasons. */ |
bd99dc85 PA |
2725 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
2726 | } | |
2727 | else | |
2728 | { | |
2729 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
2730 | } | |
2731 | ||
d50171e4 PA |
2732 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2733 | ||
bd99dc85 | 2734 | if (debug_threads) |
95954743 | 2735 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2736 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2737 | ourstatus->kind, |
2738 | ourstatus->value.sig); | |
2739 | ||
6bf5e0ba | 2740 | return ptid_of (event_child); |
bd99dc85 PA |
2741 | } |
2742 | ||
2743 | /* Get rid of any pending event in the pipe. */ | |
2744 | static void | |
2745 | async_file_flush (void) | |
2746 | { | |
2747 | int ret; | |
2748 | char buf; | |
2749 | ||
2750 | do | |
2751 | ret = read (linux_event_pipe[0], &buf, 1); | |
2752 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2753 | } | |
2754 | ||
2755 | /* Put something in the pipe, so the event loop wakes up. */ | |
2756 | static void | |
2757 | async_file_mark (void) | |
2758 | { | |
2759 | int ret; | |
2760 | ||
2761 | async_file_flush (); | |
2762 | ||
2763 | do | |
2764 | ret = write (linux_event_pipe[1], "+", 1); | |
2765 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2766 | ||
2767 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2768 | be awakened anyway. */ | |
2769 | } | |
2770 | ||
95954743 PA |
2771 | static ptid_t |
2772 | linux_wait (ptid_t ptid, | |
2773 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2774 | { |
95954743 | 2775 | ptid_t event_ptid; |
bd99dc85 PA |
2776 | |
2777 | if (debug_threads) | |
95954743 | 2778 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2779 | |
2780 | /* Flush the async file first. */ | |
2781 | if (target_is_async_p ()) | |
2782 | async_file_flush (); | |
2783 | ||
95954743 | 2784 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2785 | |
2786 | /* If at least one stop was reported, there may be more. A single | |
2787 | SIGCHLD can signal more than one child stop. */ | |
2788 | if (target_is_async_p () | |
2789 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2790 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2791 | async_file_mark (); |
2792 | ||
2793 | return event_ptid; | |
da6d8c04 DJ |
2794 | } |
2795 | ||
c5f62d5f | 2796 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2797 | |
2798 | static int | |
a1928bad | 2799 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2800 | { |
c5f62d5f DE |
2801 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2802 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2803 | |
c5f62d5f DE |
2804 | #ifdef __NR_tkill |
2805 | { | |
2806 | static int tkill_failed; | |
fd500816 | 2807 | |
c5f62d5f DE |
2808 | if (!tkill_failed) |
2809 | { | |
2810 | int ret; | |
2811 | ||
2812 | errno = 0; | |
2813 | ret = syscall (__NR_tkill, lwpid, signo); | |
2814 | if (errno != ENOSYS) | |
2815 | return ret; | |
2816 | tkill_failed = 1; | |
2817 | } | |
2818 | } | |
fd500816 DJ |
2819 | #endif |
2820 | ||
2821 | return kill (lwpid, signo); | |
2822 | } | |
2823 | ||
964e4306 PA |
2824 | void |
2825 | linux_stop_lwp (struct lwp_info *lwp) | |
2826 | { | |
2827 | send_sigstop (lwp); | |
2828 | } | |
2829 | ||
0d62e5e8 | 2830 | static void |
02fc4de7 | 2831 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2832 | { |
bd99dc85 | 2833 | int pid; |
0d62e5e8 | 2834 | |
bd99dc85 PA |
2835 | pid = lwpid_of (lwp); |
2836 | ||
0d62e5e8 DJ |
2837 | /* If we already have a pending stop signal for this process, don't |
2838 | send another. */ | |
54a0b537 | 2839 | if (lwp->stop_expected) |
0d62e5e8 | 2840 | { |
ae13219e | 2841 | if (debug_threads) |
bd99dc85 | 2842 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2843 | |
0d62e5e8 DJ |
2844 | return; |
2845 | } | |
2846 | ||
2847 | if (debug_threads) | |
bd99dc85 | 2848 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2849 | |
d50171e4 | 2850 | lwp->stop_expected = 1; |
bd99dc85 | 2851 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2852 | } |
2853 | ||
7984d532 PA |
2854 | static int |
2855 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2856 | { |
2857 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2858 | ||
7984d532 PA |
2859 | /* Ignore EXCEPT. */ |
2860 | if (lwp == except) | |
2861 | return 0; | |
2862 | ||
02fc4de7 | 2863 | if (lwp->stopped) |
7984d532 | 2864 | return 0; |
02fc4de7 PA |
2865 | |
2866 | send_sigstop (lwp); | |
7984d532 PA |
2867 | return 0; |
2868 | } | |
2869 | ||
2870 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2871 | yet. */ | |
2872 | static int | |
2873 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2874 | void *except) | |
2875 | { | |
2876 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2877 | ||
2878 | /* Ignore EXCEPT. */ | |
2879 | if (lwp == except) | |
2880 | return 0; | |
2881 | ||
2882 | lwp->suspended++; | |
2883 | ||
2884 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2885 | } |
2886 | ||
95954743 PA |
2887 | static void |
2888 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2889 | { | |
2890 | /* It's dead, really. */ | |
2891 | lwp->dead = 1; | |
2892 | ||
2893 | /* Store the exit status for later. */ | |
2894 | lwp->status_pending_p = 1; | |
2895 | lwp->status_pending = wstat; | |
2896 | ||
95954743 PA |
2897 | /* Prevent trying to stop it. */ |
2898 | lwp->stopped = 1; | |
2899 | ||
2900 | /* No further stops are expected from a dead lwp. */ | |
2901 | lwp->stop_expected = 0; | |
2902 | } | |
2903 | ||
0d62e5e8 DJ |
2904 | static void |
2905 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2906 | { | |
54a0b537 | 2907 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2908 | struct thread_info *saved_inferior; |
a1928bad | 2909 | int wstat; |
95954743 PA |
2910 | ptid_t saved_tid; |
2911 | ptid_t ptid; | |
d50171e4 | 2912 | int pid; |
0d62e5e8 | 2913 | |
54a0b537 | 2914 | if (lwp->stopped) |
d50171e4 PA |
2915 | { |
2916 | if (debug_threads) | |
2917 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2918 | lwpid_of (lwp)); | |
2919 | return; | |
2920 | } | |
0d62e5e8 DJ |
2921 | |
2922 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2923 | if (saved_inferior != NULL) |
2924 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2925 | else | |
95954743 | 2926 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2927 | |
95954743 | 2928 | ptid = lwp->head.id; |
bd99dc85 | 2929 | |
d50171e4 PA |
2930 | if (debug_threads) |
2931 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2932 | ||
2933 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2934 | |
2935 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2936 | and record the pending SIGSTOP. If the process exited, just | |
2937 | return. */ | |
d50171e4 | 2938 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2939 | { |
2940 | if (debug_threads) | |
d50171e4 PA |
2941 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2942 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2943 | |
d50171e4 | 2944 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2945 | { |
2946 | if (debug_threads) | |
d50171e4 PA |
2947 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2948 | lwpid_of (lwp), wstat); | |
2949 | ||
c35fafde PA |
2950 | lwp->status_pending_p = 1; |
2951 | lwp->status_pending = wstat; | |
2952 | } | |
0d62e5e8 | 2953 | } |
d50171e4 | 2954 | else |
95954743 PA |
2955 | { |
2956 | if (debug_threads) | |
d50171e4 | 2957 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2958 | |
d50171e4 PA |
2959 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2960 | if (lwp) | |
2961 | { | |
2962 | /* Leave this status pending for the next time we're able to | |
2963 | report it. In the mean time, we'll report this lwp as | |
2964 | dead to GDB, so GDB doesn't try to read registers and | |
2965 | memory from it. This can only happen if this was the | |
2966 | last thread of the process; otherwise, PID is removed | |
2967 | from the thread tables before linux_wait_for_event | |
2968 | returns. */ | |
2969 | mark_lwp_dead (lwp, wstat); | |
2970 | } | |
95954743 | 2971 | } |
0d62e5e8 | 2972 | |
bd99dc85 | 2973 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2974 | current_inferior = saved_inferior; |
2975 | else | |
2976 | { | |
2977 | if (debug_threads) | |
2978 | fprintf (stderr, "Previously current thread died.\n"); | |
2979 | ||
bd99dc85 PA |
2980 | if (non_stop) |
2981 | { | |
2982 | /* We can't change the current inferior behind GDB's back, | |
2983 | otherwise, a subsequent command may apply to the wrong | |
2984 | process. */ | |
2985 | current_inferior = NULL; | |
2986 | } | |
2987 | else | |
2988 | { | |
2989 | /* Set a valid thread as current. */ | |
2990 | set_desired_inferior (0); | |
2991 | } | |
0d62e5e8 DJ |
2992 | } |
2993 | } | |
2994 | ||
fa593d66 PA |
2995 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
2996 | move it out, because we need to report the stop event to GDB. For | |
2997 | example, if the user puts a breakpoint in the jump pad, it's | |
2998 | because she wants to debug it. */ | |
2999 | ||
3000 | static int | |
3001 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3002 | { | |
3003 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3004 | struct thread_info *thread = get_lwp_thread (lwp); | |
3005 | ||
3006 | gdb_assert (lwp->suspended == 0); | |
3007 | gdb_assert (lwp->stopped); | |
3008 | ||
3009 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3010 | return (supports_fast_tracepoints () | |
58b4daa5 | 3011 | && agent_loaded_p () |
fa593d66 PA |
3012 | && (gdb_breakpoint_here (lwp->stop_pc) |
3013 | || lwp->stopped_by_watchpoint | |
3014 | || thread->last_resume_kind == resume_step) | |
3015 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3016 | } | |
3017 | ||
3018 | static void | |
3019 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3020 | { | |
3021 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3022 | struct thread_info *thread = get_lwp_thread (lwp); | |
3023 | int *wstat; | |
3024 | ||
3025 | gdb_assert (lwp->suspended == 0); | |
3026 | gdb_assert (lwp->stopped); | |
3027 | ||
3028 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3029 | ||
3030 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3031 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
3032 | && !lwp->stopped_by_watchpoint | |
3033 | && thread->last_resume_kind != resume_step | |
3034 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3035 | { | |
3036 | if (debug_threads) | |
3037 | fprintf (stderr, | |
3038 | "LWP %ld needs stabilizing (in jump pad)\n", | |
3039 | lwpid_of (lwp)); | |
3040 | ||
3041 | if (wstat) | |
3042 | { | |
3043 | lwp->status_pending_p = 0; | |
3044 | enqueue_one_deferred_signal (lwp, wstat); | |
3045 | ||
3046 | if (debug_threads) | |
3047 | fprintf (stderr, | |
3048 | "Signal %d for LWP %ld deferred " | |
3049 | "(in jump pad)\n", | |
3050 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
3051 | } | |
3052 | ||
3053 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3054 | } | |
3055 | else | |
3056 | lwp->suspended++; | |
3057 | } | |
3058 | ||
3059 | static int | |
3060 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3061 | { | |
3062 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3063 | ||
3064 | if (lwp->dead) | |
3065 | return 0; | |
3066 | if (lwp->stopped) | |
3067 | return 0; | |
3068 | return 1; | |
3069 | } | |
3070 | ||
7984d532 PA |
3071 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3072 | If SUSPEND, then also increase the suspend count of every LWP, | |
3073 | except EXCEPT. */ | |
3074 | ||
0d62e5e8 | 3075 | static void |
7984d532 | 3076 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 DJ |
3077 | { |
3078 | stopping_threads = 1; | |
7984d532 PA |
3079 | |
3080 | if (suspend) | |
3081 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
3082 | else | |
3083 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 3084 | for_each_inferior (&all_lwps, wait_for_sigstop); |
0d62e5e8 DJ |
3085 | stopping_threads = 0; |
3086 | } | |
3087 | ||
da6d8c04 DJ |
3088 | /* Resume execution of the inferior process. |
3089 | If STEP is nonzero, single-step it. | |
3090 | If SIGNAL is nonzero, give it that signal. */ | |
3091 | ||
ce3a066d | 3092 | static void |
2acc282a | 3093 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3094 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3095 | { |
0d62e5e8 | 3096 | struct thread_info *saved_inferior; |
fa593d66 | 3097 | int fast_tp_collecting; |
0d62e5e8 | 3098 | |
54a0b537 | 3099 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3100 | return; |
3101 | ||
fa593d66 PA |
3102 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3103 | ||
3104 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3105 | ||
219f2f23 PA |
3106 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3107 | user used the "jump" command, or "set $pc = foo"). */ | |
3108 | if (lwp->stop_pc != get_pc (lwp)) | |
3109 | { | |
3110 | /* Collecting 'while-stepping' actions doesn't make sense | |
3111 | anymore. */ | |
3112 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
3113 | } | |
3114 | ||
0d62e5e8 DJ |
3115 | /* If we have pending signals or status, and a new signal, enqueue the |
3116 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3117 | breakpoint; it will be picked up again below. */ | |
3118 | if (signal != 0 | |
fa593d66 PA |
3119 | && (lwp->status_pending_p |
3120 | || lwp->pending_signals != NULL | |
3121 | || lwp->bp_reinsert != 0 | |
3122 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3123 | { |
3124 | struct pending_signals *p_sig; | |
bca929d3 | 3125 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3126 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3127 | p_sig->signal = signal; |
32ca6d61 DJ |
3128 | if (info == NULL) |
3129 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3130 | else | |
3131 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3132 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3133 | } |
3134 | ||
d50171e4 PA |
3135 | if (lwp->status_pending_p) |
3136 | { | |
3137 | if (debug_threads) | |
3138 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
3139 | " has pending status\n", | |
3140 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
3141 | lwp->stop_expected ? "expected" : "not expected"); | |
3142 | return; | |
3143 | } | |
0d62e5e8 DJ |
3144 | |
3145 | saved_inferior = current_inferior; | |
54a0b537 | 3146 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
3147 | |
3148 | if (debug_threads) | |
1b3f6016 | 3149 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 3150 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 3151 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3152 | |
3153 | /* This bit needs some thinking about. If we get a signal that | |
3154 | we must report while a single-step reinsert is still pending, | |
3155 | we often end up resuming the thread. It might be better to | |
3156 | (ew) allow a stack of pending events; then we could be sure that | |
3157 | the reinsert happened right away and not lose any signals. | |
3158 | ||
3159 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3160 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3161 | complete correctness, so it won't solve that problem. It may be |
3162 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3163 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3164 | { |
3165 | if (debug_threads) | |
d50171e4 PA |
3166 | fprintf (stderr, " pending reinsert at 0x%s\n", |
3167 | paddress (lwp->bp_reinsert)); | |
3168 | ||
3169 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
3170 | { | |
fa593d66 PA |
3171 | if (fast_tp_collecting == 0) |
3172 | { | |
3173 | if (step == 0) | |
3174 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3175 | if (lwp->suspended) | |
3176 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3177 | lwp->suspended); | |
3178 | } | |
d50171e4 PA |
3179 | |
3180 | step = 1; | |
3181 | } | |
0d62e5e8 DJ |
3182 | |
3183 | /* Postpone any pending signal. It was enqueued above. */ | |
3184 | signal = 0; | |
3185 | } | |
3186 | ||
fa593d66 PA |
3187 | if (fast_tp_collecting == 1) |
3188 | { | |
3189 | if (debug_threads) | |
3190 | fprintf (stderr, "\ | |
3191 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
3192 | lwpid_of (lwp)); | |
3193 | ||
3194 | /* Postpone any pending signal. It was enqueued above. */ | |
3195 | signal = 0; | |
3196 | } | |
3197 | else if (fast_tp_collecting == 2) | |
3198 | { | |
3199 | if (debug_threads) | |
3200 | fprintf (stderr, "\ | |
3201 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
3202 | lwpid_of (lwp)); | |
3203 | ||
3204 | if (can_hardware_single_step ()) | |
3205 | step = 1; | |
3206 | else | |
3207 | fatal ("moving out of jump pad single-stepping" | |
3208 | " not implemented on this target"); | |
3209 | ||
3210 | /* Postpone any pending signal. It was enqueued above. */ | |
3211 | signal = 0; | |
3212 | } | |
3213 | ||
219f2f23 PA |
3214 | /* If we have while-stepping actions in this thread set it stepping. |
3215 | If we have a signal to deliver, it may or may not be set to | |
3216 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3217 | while-stepping into a signal handler. A possible smart thing to | |
3218 | do would be to set an internal breakpoint at the signal return | |
3219 | address, continue, and carry on catching this while-stepping | |
3220 | action only when that breakpoint is hit. A future | |
3221 | enhancement. */ | |
3222 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
3223 | && can_hardware_single_step ()) | |
3224 | { | |
3225 | if (debug_threads) | |
3226 | fprintf (stderr, | |
3227 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
3228 | lwpid_of (lwp)); | |
3229 | step = 1; | |
3230 | } | |
3231 | ||
aa691b87 | 3232 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3233 | { |
442ea881 PA |
3234 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3235 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 3236 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3237 | } |
3238 | ||
fa593d66 PA |
3239 | /* If we have pending signals, consume one unless we are trying to |
3240 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3241 | collect. */ | |
3242 | if (lwp->pending_signals != NULL | |
3243 | && lwp->bp_reinsert == 0 | |
3244 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3245 | { |
3246 | struct pending_signals **p_sig; | |
3247 | ||
54a0b537 | 3248 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3249 | while ((*p_sig)->prev != NULL) |
3250 | p_sig = &(*p_sig)->prev; | |
3251 | ||
3252 | signal = (*p_sig)->signal; | |
32ca6d61 | 3253 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 3254 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 3255 | |
0d62e5e8 DJ |
3256 | free (*p_sig); |
3257 | *p_sig = NULL; | |
3258 | } | |
3259 | ||
aa5ca48f DE |
3260 | if (the_low_target.prepare_to_resume != NULL) |
3261 | the_low_target.prepare_to_resume (lwp); | |
3262 | ||
0d62e5e8 | 3263 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 3264 | get_lwp_thread (lwp)); |
da6d8c04 | 3265 | errno = 0; |
54a0b537 | 3266 | lwp->stopped = 0; |
c3adc08c | 3267 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3268 | lwp->stepping = step; |
14ce3065 DE |
3269 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
3270 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3271 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3272 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
3273 | |
3274 | current_inferior = saved_inferior; | |
da6d8c04 | 3275 | if (errno) |
3221518c UW |
3276 | { |
3277 | /* ESRCH from ptrace either means that the thread was already | |
3278 | running (an error) or that it is gone (a race condition). If | |
3279 | it's gone, we will get a notification the next time we wait, | |
3280 | so we can ignore the error. We could differentiate these | |
3281 | two, but it's tricky without waiting; the thread still exists | |
3282 | as a zombie, so sending it signal 0 would succeed. So just | |
3283 | ignore ESRCH. */ | |
3284 | if (errno == ESRCH) | |
3285 | return; | |
3286 | ||
3287 | perror_with_name ("ptrace"); | |
3288 | } | |
da6d8c04 DJ |
3289 | } |
3290 | ||
2bd7c093 PA |
3291 | struct thread_resume_array |
3292 | { | |
3293 | struct thread_resume *resume; | |
3294 | size_t n; | |
3295 | }; | |
64386c31 DJ |
3296 | |
3297 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
3298 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
3299 | resume request. | |
3300 | ||
3301 | This algorithm is O(threads * resume elements), but resume elements | |
3302 | is small (and will remain small at least until GDB supports thread | |
3303 | suspension). */ | |
2bd7c093 PA |
3304 | static int |
3305 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3306 | { |
54a0b537 | 3307 | struct lwp_info *lwp; |
64386c31 | 3308 | struct thread_info *thread; |
5544ad89 | 3309 | int ndx; |
2bd7c093 | 3310 | struct thread_resume_array *r; |
64386c31 DJ |
3311 | |
3312 | thread = (struct thread_info *) entry; | |
54a0b537 | 3313 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3314 | r = arg; |
64386c31 | 3315 | |
2bd7c093 | 3316 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3317 | { |
3318 | ptid_t ptid = r->resume[ndx].thread; | |
3319 | if (ptid_equal (ptid, minus_one_ptid) | |
3320 | || ptid_equal (ptid, entry->id) | |
3321 | || (ptid_is_pid (ptid) | |
3322 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
3323 | || (ptid_get_lwp (ptid) == -1 | |
3324 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
3325 | { | |
d50171e4 | 3326 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3327 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3328 | { |
3329 | if (debug_threads) | |
3330 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3331 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3332 | ? "stopped" | |
3333 | : "stopping", | |
3334 | lwpid_of (lwp)); | |
3335 | ||
3336 | continue; | |
3337 | } | |
3338 | ||
95954743 | 3339 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3340 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 PA |
3341 | |
3342 | /* If we had a deferred signal to report, dequeue one now. | |
3343 | This can happen if LWP gets more than one signal while | |
3344 | trying to get out of a jump pad. */ | |
3345 | if (lwp->stopped | |
3346 | && !lwp->status_pending_p | |
3347 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3348 | { | |
3349 | lwp->status_pending_p = 1; | |
3350 | ||
3351 | if (debug_threads) | |
3352 | fprintf (stderr, | |
3353 | "Dequeueing deferred signal %d for LWP %ld, " | |
3354 | "leaving status pending.\n", | |
3355 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3356 | } | |
3357 | ||
95954743 PA |
3358 | return 0; |
3359 | } | |
3360 | } | |
2bd7c093 PA |
3361 | |
3362 | /* No resume action for this thread. */ | |
3363 | lwp->resume = NULL; | |
64386c31 | 3364 | |
2bd7c093 | 3365 | return 0; |
5544ad89 DJ |
3366 | } |
3367 | ||
5544ad89 | 3368 | |
bd99dc85 PA |
3369 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3370 | static int | |
3371 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3372 | { |
bd99dc85 | 3373 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3374 | |
bd99dc85 PA |
3375 | /* LWPs which will not be resumed are not interesting, because |
3376 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3377 | if (lwp->resume == NULL) |
bd99dc85 | 3378 | return 0; |
64386c31 | 3379 | |
bd99dc85 | 3380 | if (lwp->status_pending_p) |
d50171e4 PA |
3381 | * (int *) flag_p = 1; |
3382 | ||
3383 | return 0; | |
3384 | } | |
3385 | ||
3386 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3387 | internal breakpoint that we need to step over. It assumes that any | |
3388 | required STOP_PC adjustment has already been propagated to the | |
3389 | inferior's regcache. */ | |
3390 | ||
3391 | static int | |
3392 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3393 | { | |
3394 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3395 | struct thread_info *thread; |
d50171e4 PA |
3396 | struct thread_info *saved_inferior; |
3397 | CORE_ADDR pc; | |
3398 | ||
3399 | /* LWPs which will not be resumed are not interesting, because we | |
3400 | might not wait for them next time through linux_wait. */ | |
3401 | ||
3402 | if (!lwp->stopped) | |
3403 | { | |
3404 | if (debug_threads) | |
3405 | fprintf (stderr, | |
3406 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3407 | lwpid_of (lwp)); | |
3408 | return 0; | |
3409 | } | |
3410 | ||
8336d594 PA |
3411 | thread = get_lwp_thread (lwp); |
3412 | ||
3413 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3414 | { |
3415 | if (debug_threads) | |
3416 | fprintf (stderr, | |
3417 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3418 | lwpid_of (lwp)); | |
3419 | return 0; | |
3420 | } | |
3421 | ||
7984d532 PA |
3422 | gdb_assert (lwp->suspended >= 0); |
3423 | ||
3424 | if (lwp->suspended) | |
3425 | { | |
3426 | if (debug_threads) | |
3427 | fprintf (stderr, | |
3428 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3429 | lwpid_of (lwp)); | |
3430 | return 0; | |
3431 | } | |
3432 | ||
d50171e4 PA |
3433 | if (!lwp->need_step_over) |
3434 | { | |
3435 | if (debug_threads) | |
3436 | fprintf (stderr, | |
3437 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3438 | } | |
5544ad89 | 3439 | |
bd99dc85 | 3440 | if (lwp->status_pending_p) |
d50171e4 PA |
3441 | { |
3442 | if (debug_threads) | |
3443 | fprintf (stderr, | |
3444 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3445 | lwpid_of (lwp)); | |
3446 | return 0; | |
3447 | } | |
3448 | ||
3449 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3450 | or we have. */ | |
3451 | pc = get_pc (lwp); | |
3452 | ||
3453 | /* If the PC has changed since we stopped, then don't do anything, | |
3454 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3455 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3456 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3457 | command, or poked thread's registers herself. */ | |
3458 | if (pc != lwp->stop_pc) | |
3459 | { | |
3460 | if (debug_threads) | |
3461 | fprintf (stderr, | |
3462 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3463 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3464 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3465 | ||
3466 | lwp->need_step_over = 0; | |
3467 | return 0; | |
3468 | } | |
3469 | ||
3470 | saved_inferior = current_inferior; | |
8336d594 | 3471 | current_inferior = thread; |
d50171e4 | 3472 | |
8b07ae33 | 3473 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3474 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3475 | { |
8b07ae33 | 3476 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3477 | though. If the condition is being evaluated on the target's side |
3478 | and it evaluate to false, step over this breakpoint as well. */ | |
3479 | if (gdb_breakpoint_here (pc) | |
3480 | && gdb_condition_true_at_breakpoint (pc)) | |
8b07ae33 PA |
3481 | { |
3482 | if (debug_threads) | |
3483 | fprintf (stderr, | |
3484 | "Need step over [LWP %ld]? yes, but found" | |
3485 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3486 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3487 | |
8b07ae33 PA |
3488 | current_inferior = saved_inferior; |
3489 | return 0; | |
3490 | } | |
3491 | else | |
3492 | { | |
3493 | if (debug_threads) | |
3494 | fprintf (stderr, | |
493e2a69 MS |
3495 | "Need step over [LWP %ld]? yes, " |
3496 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3497 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3498 | |
8b07ae33 PA |
3499 | /* We've found an lwp that needs stepping over --- return 1 so |
3500 | that find_inferior stops looking. */ | |
3501 | current_inferior = saved_inferior; | |
3502 | ||
3503 | /* If the step over is cancelled, this is set again. */ | |
3504 | lwp->need_step_over = 0; | |
3505 | return 1; | |
3506 | } | |
d50171e4 PA |
3507 | } |
3508 | ||
3509 | current_inferior = saved_inferior; | |
3510 | ||
3511 | if (debug_threads) | |
3512 | fprintf (stderr, | |
3513 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3514 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3515 | |
bd99dc85 | 3516 | return 0; |
5544ad89 DJ |
3517 | } |
3518 | ||
d50171e4 PA |
3519 | /* Start a step-over operation on LWP. When LWP stopped at a |
3520 | breakpoint, to make progress, we need to remove the breakpoint out | |
3521 | of the way. If we let other threads run while we do that, they may | |
3522 | pass by the breakpoint location and miss hitting it. To avoid | |
3523 | that, a step-over momentarily stops all threads while LWP is | |
3524 | single-stepped while the breakpoint is temporarily uninserted from | |
3525 | the inferior. When the single-step finishes, we reinsert the | |
3526 | breakpoint, and let all threads that are supposed to be running, | |
3527 | run again. | |
3528 | ||
3529 | On targets that don't support hardware single-step, we don't | |
3530 | currently support full software single-stepping. Instead, we only | |
3531 | support stepping over the thread event breakpoint, by asking the | |
3532 | low target where to place a reinsert breakpoint. Since this | |
3533 | routine assumes the breakpoint being stepped over is a thread event | |
3534 | breakpoint, it usually assumes the return address of the current | |
3535 | function is a good enough place to set the reinsert breakpoint. */ | |
3536 | ||
3537 | static int | |
3538 | start_step_over (struct lwp_info *lwp) | |
3539 | { | |
3540 | struct thread_info *saved_inferior; | |
3541 | CORE_ADDR pc; | |
3542 | int step; | |
3543 | ||
3544 | if (debug_threads) | |
3545 | fprintf (stderr, | |
3546 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3547 | lwpid_of (lwp)); | |
3548 | ||
7984d532 PA |
3549 | stop_all_lwps (1, lwp); |
3550 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3551 | |
3552 | if (debug_threads) | |
3553 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3554 | ||
3555 | /* Note, we should always reach here with an already adjusted PC, | |
3556 | either by GDB (if we're resuming due to GDB's request), or by our | |
3557 | caller, if we just finished handling an internal breakpoint GDB | |
3558 | shouldn't care about. */ | |
3559 | pc = get_pc (lwp); | |
3560 | ||
3561 | saved_inferior = current_inferior; | |
3562 | current_inferior = get_lwp_thread (lwp); | |
3563 | ||
3564 | lwp->bp_reinsert = pc; | |
3565 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3566 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3567 | |
3568 | if (can_hardware_single_step ()) | |
3569 | { | |
3570 | step = 1; | |
3571 | } | |
3572 | else | |
3573 | { | |
3574 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3575 | set_reinsert_breakpoint (raddr); | |
3576 | step = 0; | |
3577 | } | |
3578 | ||
3579 | current_inferior = saved_inferior; | |
3580 | ||
3581 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3582 | ||
3583 | /* Require next event from this LWP. */ | |
3584 | step_over_bkpt = lwp->head.id; | |
3585 | return 1; | |
3586 | } | |
3587 | ||
3588 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3589 | start_step_over, if still there, and delete any reinsert | |
3590 | breakpoints we've set, on non hardware single-step targets. */ | |
3591 | ||
3592 | static int | |
3593 | finish_step_over (struct lwp_info *lwp) | |
3594 | { | |
3595 | if (lwp->bp_reinsert != 0) | |
3596 | { | |
3597 | if (debug_threads) | |
3598 | fprintf (stderr, "Finished step over.\n"); | |
3599 | ||
3600 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3601 | may be no breakpoint to reinsert there by now. */ | |
3602 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3603 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3604 | |
3605 | lwp->bp_reinsert = 0; | |
3606 | ||
3607 | /* Delete any software-single-step reinsert breakpoints. No | |
3608 | longer needed. We don't have to worry about other threads | |
3609 | hitting this trap, and later not being able to explain it, | |
3610 | because we were stepping over a breakpoint, and we hold all | |
3611 | threads but LWP stopped while doing that. */ | |
3612 | if (!can_hardware_single_step ()) | |
3613 | delete_reinsert_breakpoints (); | |
3614 | ||
3615 | step_over_bkpt = null_ptid; | |
3616 | return 1; | |
3617 | } | |
3618 | else | |
3619 | return 0; | |
3620 | } | |
3621 | ||
5544ad89 DJ |
3622 | /* This function is called once per thread. We check the thread's resume |
3623 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3624 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3625 | |
bd99dc85 PA |
3626 | For threads which we aren't explicitly told otherwise, we preserve |
3627 | the stepping flag; this is used for stepping over gdbserver-placed | |
3628 | breakpoints. | |
3629 | ||
3630 | If pending_flags was set in any thread, we queue any needed | |
3631 | signals, since we won't actually resume. We already have a pending | |
3632 | event to report, so we don't need to preserve any step requests; | |
3633 | they should be re-issued if necessary. */ | |
3634 | ||
3635 | static int | |
3636 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3637 | { |
54a0b537 | 3638 | struct lwp_info *lwp; |
5544ad89 | 3639 | struct thread_info *thread; |
bd99dc85 | 3640 | int step; |
d50171e4 PA |
3641 | int leave_all_stopped = * (int *) arg; |
3642 | int leave_pending; | |
5544ad89 DJ |
3643 | |
3644 | thread = (struct thread_info *) entry; | |
54a0b537 | 3645 | lwp = get_thread_lwp (thread); |
5544ad89 | 3646 | |
2bd7c093 | 3647 | if (lwp->resume == NULL) |
bd99dc85 | 3648 | return 0; |
5544ad89 | 3649 | |
bd99dc85 | 3650 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3651 | { |
bd99dc85 | 3652 | if (debug_threads) |
d50171e4 | 3653 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3654 | |
3655 | if (!lwp->stopped) | |
3656 | { | |
3657 | if (debug_threads) | |
d50171e4 | 3658 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3659 | |
d50171e4 PA |
3660 | /* Stop the thread, and wait for the event asynchronously, |
3661 | through the event loop. */ | |
02fc4de7 | 3662 | send_sigstop (lwp); |
bd99dc85 PA |
3663 | } |
3664 | else | |
3665 | { | |
3666 | if (debug_threads) | |
d50171e4 PA |
3667 | fprintf (stderr, "already stopped LWP %ld\n", |
3668 | lwpid_of (lwp)); | |
3669 | ||
3670 | /* The LWP may have been stopped in an internal event that | |
3671 | was not meant to be notified back to GDB (e.g., gdbserver | |
3672 | breakpoint), so we should be reporting a stop event in | |
3673 | this case too. */ | |
3674 | ||
3675 | /* If the thread already has a pending SIGSTOP, this is a | |
3676 | no-op. Otherwise, something later will presumably resume | |
3677 | the thread and this will cause it to cancel any pending | |
3678 | operation, due to last_resume_kind == resume_stop. If | |
3679 | the thread already has a pending status to report, we | |
3680 | will still report it the next time we wait - see | |
3681 | status_pending_p_callback. */ | |
1a981360 PA |
3682 | |
3683 | /* If we already have a pending signal to report, then | |
3684 | there's no need to queue a SIGSTOP, as this means we're | |
3685 | midway through moving the LWP out of the jumppad, and we | |
3686 | will report the pending signal as soon as that is | |
3687 | finished. */ | |
3688 | if (lwp->pending_signals_to_report == NULL) | |
3689 | send_sigstop (lwp); | |
bd99dc85 | 3690 | } |
32ca6d61 | 3691 | |
bd99dc85 PA |
3692 | /* For stop requests, we're done. */ |
3693 | lwp->resume = NULL; | |
fc7238bb | 3694 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3695 | return 0; |
5544ad89 DJ |
3696 | } |
3697 | ||
bd99dc85 PA |
3698 | /* If this thread which is about to be resumed has a pending status, |
3699 | then don't resume any threads - we can just report the pending | |
3700 | status. Make sure to queue any signals that would otherwise be | |
3701 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3702 | thread has a pending status. If there's a thread that needs the |
3703 | step-over-breakpoint dance, then don't resume any other thread | |
3704 | but that particular one. */ | |
3705 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3706 | |
d50171e4 | 3707 | if (!leave_pending) |
bd99dc85 PA |
3708 | { |
3709 | if (debug_threads) | |
3710 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3711 | |
d50171e4 | 3712 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3713 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3714 | } |
3715 | else | |
3716 | { | |
3717 | if (debug_threads) | |
3718 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3719 | |
bd99dc85 PA |
3720 | /* If we have a new signal, enqueue the signal. */ |
3721 | if (lwp->resume->sig != 0) | |
3722 | { | |
3723 | struct pending_signals *p_sig; | |
3724 | p_sig = xmalloc (sizeof (*p_sig)); | |
3725 | p_sig->prev = lwp->pending_signals; | |
3726 | p_sig->signal = lwp->resume->sig; | |
3727 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3728 | ||
3729 | /* If this is the same signal we were previously stopped by, | |
3730 | make sure to queue its siginfo. We can ignore the return | |
3731 | value of ptrace; if it fails, we'll skip | |
3732 | PTRACE_SETSIGINFO. */ | |
3733 | if (WIFSTOPPED (lwp->last_status) | |
3734 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
3735 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
3736 | ||
3737 | lwp->pending_signals = p_sig; | |
3738 | } | |
3739 | } | |
5544ad89 | 3740 | |
fc7238bb | 3741 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3742 | lwp->resume = NULL; |
5544ad89 | 3743 | return 0; |
0d62e5e8 DJ |
3744 | } |
3745 | ||
3746 | static void | |
2bd7c093 | 3747 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3748 | { |
2bd7c093 | 3749 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3750 | struct lwp_info *need_step_over = NULL; |
3751 | int any_pending; | |
3752 | int leave_all_stopped; | |
c6ecbae5 | 3753 | |
2bd7c093 | 3754 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3755 | |
d50171e4 PA |
3756 | /* If there is a thread which would otherwise be resumed, which has |
3757 | a pending status, then don't resume any threads - we can just | |
3758 | report the pending status. Make sure to queue any signals that | |
3759 | would otherwise be sent. In non-stop mode, we'll apply this | |
3760 | logic to each thread individually. We consume all pending events | |
3761 | before considering to start a step-over (in all-stop). */ | |
3762 | any_pending = 0; | |
bd99dc85 | 3763 | if (!non_stop) |
d50171e4 PA |
3764 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3765 | ||
3766 | /* If there is a thread which would otherwise be resumed, which is | |
3767 | stopped at a breakpoint that needs stepping over, then don't | |
3768 | resume any threads - have it step over the breakpoint with all | |
3769 | other threads stopped, then resume all threads again. Make sure | |
3770 | to queue any signals that would otherwise be delivered or | |
3771 | queued. */ | |
3772 | if (!any_pending && supports_breakpoints ()) | |
3773 | need_step_over | |
3774 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3775 | need_step_over_p, NULL); | |
3776 | ||
3777 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3778 | ||
3779 | if (debug_threads) | |
3780 | { | |
3781 | if (need_step_over != NULL) | |
3782 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3783 | else if (any_pending) | |
3784 | fprintf (stderr, | |
3785 | "Not resuming, all-stop and found " | |
3786 | "an LWP with pending status\n"); | |
3787 | else | |
3788 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3789 | } | |
3790 | ||
3791 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3792 | otherwise deliver. */ | |
3793 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3794 | ||
3795 | if (need_step_over) | |
3796 | start_step_over (need_step_over); | |
3797 | } | |
3798 | ||
3799 | /* This function is called once per thread. We check the thread's | |
3800 | last resume request, which will tell us whether to resume, step, or | |
3801 | leave the thread stopped. Any signal the client requested to be | |
3802 | delivered has already been enqueued at this point. | |
3803 | ||
3804 | If any thread that GDB wants running is stopped at an internal | |
3805 | breakpoint that needs stepping over, we start a step-over operation | |
3806 | on that particular thread, and leave all others stopped. */ | |
3807 | ||
7984d532 PA |
3808 | static int |
3809 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3810 | { |
7984d532 | 3811 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3812 | struct thread_info *thread; |
d50171e4 PA |
3813 | int step; |
3814 | ||
7984d532 PA |
3815 | if (lwp == except) |
3816 | return 0; | |
d50171e4 PA |
3817 | |
3818 | if (debug_threads) | |
3819 | fprintf (stderr, | |
3820 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3821 | ||
3822 | if (!lwp->stopped) | |
3823 | { | |
3824 | if (debug_threads) | |
3825 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3826 | return 0; |
d50171e4 PA |
3827 | } |
3828 | ||
8336d594 PA |
3829 | thread = get_lwp_thread (lwp); |
3830 | ||
02fc4de7 PA |
3831 | if (thread->last_resume_kind == resume_stop |
3832 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3833 | { |
3834 | if (debug_threads) | |
02fc4de7 PA |
3835 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3836 | lwpid_of (lwp)); | |
7984d532 | 3837 | return 0; |
d50171e4 PA |
3838 | } |
3839 | ||
3840 | if (lwp->status_pending_p) | |
3841 | { | |
3842 | if (debug_threads) | |
3843 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3844 | lwpid_of (lwp)); | |
7984d532 | 3845 | return 0; |
d50171e4 PA |
3846 | } |
3847 | ||
7984d532 PA |
3848 | gdb_assert (lwp->suspended >= 0); |
3849 | ||
d50171e4 PA |
3850 | if (lwp->suspended) |
3851 | { | |
3852 | if (debug_threads) | |
3853 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3854 | return 0; |
d50171e4 PA |
3855 | } |
3856 | ||
1a981360 PA |
3857 | if (thread->last_resume_kind == resume_stop |
3858 | && lwp->pending_signals_to_report == NULL | |
3859 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3860 | { |
3861 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3862 | last_status.kind check above would catch it, and we wouldn't | |
3863 | reach here. This LWP may have been momentarily paused by a | |
3864 | stop_all_lwps call while handling for example, another LWP's | |
3865 | step-over. In that case, the pending expected SIGSTOP signal | |
3866 | that was queued at vCont;t handling time will have already | |
3867 | been consumed by wait_for_sigstop, and so we need to requeue | |
3868 | another one here. Note that if the LWP already has a SIGSTOP | |
3869 | pending, this is a no-op. */ | |
3870 | ||
3871 | if (debug_threads) | |
3872 | fprintf (stderr, | |
3873 | "Client wants LWP %ld to stop. " | |
3874 | "Making sure it has a SIGSTOP pending\n", | |
3875 | lwpid_of (lwp)); | |
3876 | ||
3877 | send_sigstop (lwp); | |
3878 | } | |
3879 | ||
8336d594 | 3880 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3881 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3882 | return 0; |
3883 | } | |
3884 | ||
3885 | static int | |
3886 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3887 | { | |
3888 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3889 | ||
3890 | if (lwp == except) | |
3891 | return 0; | |
3892 | ||
3893 | lwp->suspended--; | |
3894 | gdb_assert (lwp->suspended >= 0); | |
3895 | ||
3896 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3897 | } |
3898 | ||
3899 | /* When we finish a step-over, set threads running again. If there's | |
3900 | another thread that may need a step-over, now's the time to start | |
3901 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3902 | ||
3903 | static void | |
3904 | proceed_all_lwps (void) | |
3905 | { | |
3906 | struct lwp_info *need_step_over; | |
3907 | ||
3908 | /* If there is a thread which would otherwise be resumed, which is | |
3909 | stopped at a breakpoint that needs stepping over, then don't | |
3910 | resume any threads - have it step over the breakpoint with all | |
3911 | other threads stopped, then resume all threads again. */ | |
3912 | ||
3913 | if (supports_breakpoints ()) | |
3914 | { | |
3915 | need_step_over | |
3916 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3917 | need_step_over_p, NULL); | |
3918 | ||
3919 | if (need_step_over != NULL) | |
3920 | { | |
3921 | if (debug_threads) | |
3922 | fprintf (stderr, "proceed_all_lwps: found " | |
3923 | "thread %ld needing a step-over\n", | |
3924 | lwpid_of (need_step_over)); | |
3925 | ||
3926 | start_step_over (need_step_over); | |
3927 | return; | |
3928 | } | |
3929 | } | |
5544ad89 | 3930 | |
d50171e4 PA |
3931 | if (debug_threads) |
3932 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3933 | ||
7984d532 | 3934 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3935 | } |
3936 | ||
3937 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3938 | pending statuses, are set to run again, except for EXCEPT, if not | |
3939 | NULL. This undoes a stop_all_lwps call. */ | |
3940 | ||
3941 | static void | |
7984d532 | 3942 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3943 | { |
5544ad89 DJ |
3944 | if (debug_threads) |
3945 | { | |
d50171e4 PA |
3946 | if (except) |
3947 | fprintf (stderr, | |
3948 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3949 | else |
d50171e4 PA |
3950 | fprintf (stderr, |
3951 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3952 | } |
3953 | ||
7984d532 PA |
3954 | if (unsuspend) |
3955 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3956 | else | |
3957 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3958 | } |
3959 | ||
58caa3dc DJ |
3960 | |
3961 | #ifdef HAVE_LINUX_REGSETS | |
3962 | ||
1faeff08 MR |
3963 | #define use_linux_regsets 1 |
3964 | ||
58caa3dc | 3965 | static int |
442ea881 | 3966 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3967 | { |
3968 | struct regset_info *regset; | |
e9d25b98 | 3969 | int saw_general_regs = 0; |
95954743 | 3970 | int pid; |
1570b33e | 3971 | struct iovec iov; |
58caa3dc DJ |
3972 | |
3973 | regset = target_regsets; | |
3974 | ||
95954743 | 3975 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3976 | while (regset->size >= 0) |
3977 | { | |
1570b33e L |
3978 | void *buf, *data; |
3979 | int nt_type, res; | |
58caa3dc | 3980 | |
52fa2412 | 3981 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3982 | { |
3983 | regset ++; | |
3984 | continue; | |
3985 | } | |
3986 | ||
bca929d3 | 3987 | buf = xmalloc (regset->size); |
1570b33e L |
3988 | |
3989 | nt_type = regset->nt_type; | |
3990 | if (nt_type) | |
3991 | { | |
3992 | iov.iov_base = buf; | |
3993 | iov.iov_len = regset->size; | |
3994 | data = (void *) &iov; | |
3995 | } | |
3996 | else | |
3997 | data = buf; | |
3998 | ||
dfb64f85 | 3999 | #ifndef __sparc__ |
1570b33e | 4000 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 4001 | #else |
1570b33e | 4002 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4003 | #endif |
58caa3dc DJ |
4004 | if (res < 0) |
4005 | { | |
4006 | if (errno == EIO) | |
4007 | { | |
52fa2412 UW |
4008 | /* If we get EIO on a regset, do not try it again for |
4009 | this process. */ | |
4010 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 4011 | free (buf); |
52fa2412 | 4012 | continue; |
58caa3dc DJ |
4013 | } |
4014 | else | |
4015 | { | |
0d62e5e8 | 4016 | char s[256]; |
95954743 PA |
4017 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4018 | pid); | |
0d62e5e8 | 4019 | perror (s); |
58caa3dc DJ |
4020 | } |
4021 | } | |
e9d25b98 DJ |
4022 | else if (regset->type == GENERAL_REGS) |
4023 | saw_general_regs = 1; | |
442ea881 | 4024 | regset->store_function (regcache, buf); |
58caa3dc | 4025 | regset ++; |
fdeb2a12 | 4026 | free (buf); |
58caa3dc | 4027 | } |
e9d25b98 DJ |
4028 | if (saw_general_regs) |
4029 | return 0; | |
4030 | else | |
4031 | return 1; | |
58caa3dc DJ |
4032 | } |
4033 | ||
4034 | static int | |
442ea881 | 4035 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
4036 | { |
4037 | struct regset_info *regset; | |
e9d25b98 | 4038 | int saw_general_regs = 0; |
95954743 | 4039 | int pid; |
1570b33e | 4040 | struct iovec iov; |
58caa3dc DJ |
4041 | |
4042 | regset = target_regsets; | |
4043 | ||
95954743 | 4044 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4045 | while (regset->size >= 0) |
4046 | { | |
1570b33e L |
4047 | void *buf, *data; |
4048 | int nt_type, res; | |
58caa3dc | 4049 | |
52fa2412 | 4050 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
4051 | { |
4052 | regset ++; | |
4053 | continue; | |
4054 | } | |
4055 | ||
bca929d3 | 4056 | buf = xmalloc (regset->size); |
545587ee DJ |
4057 | |
4058 | /* First fill the buffer with the current register set contents, | |
4059 | in case there are any items in the kernel's regset that are | |
4060 | not in gdbserver's regcache. */ | |
1570b33e L |
4061 | |
4062 | nt_type = regset->nt_type; | |
4063 | if (nt_type) | |
4064 | { | |
4065 | iov.iov_base = buf; | |
4066 | iov.iov_len = regset->size; | |
4067 | data = (void *) &iov; | |
4068 | } | |
4069 | else | |
4070 | data = buf; | |
4071 | ||
dfb64f85 | 4072 | #ifndef __sparc__ |
1570b33e | 4073 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 4074 | #else |
689cc2ae | 4075 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4076 | #endif |
545587ee DJ |
4077 | |
4078 | if (res == 0) | |
4079 | { | |
4080 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4081 | regset->fill_function (regcache, buf); |
545587ee DJ |
4082 | |
4083 | /* Only now do we write the register set. */ | |
dfb64f85 | 4084 | #ifndef __sparc__ |
1570b33e | 4085 | res = ptrace (regset->set_request, pid, nt_type, data); |
dfb64f85 | 4086 | #else |
1570b33e | 4087 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4088 | #endif |
545587ee DJ |
4089 | } |
4090 | ||
58caa3dc DJ |
4091 | if (res < 0) |
4092 | { | |
4093 | if (errno == EIO) | |
4094 | { | |
52fa2412 UW |
4095 | /* If we get EIO on a regset, do not try it again for |
4096 | this process. */ | |
4097 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 4098 | free (buf); |
52fa2412 | 4099 | continue; |
58caa3dc | 4100 | } |
3221518c UW |
4101 | else if (errno == ESRCH) |
4102 | { | |
1b3f6016 PA |
4103 | /* At this point, ESRCH should mean the process is |
4104 | already gone, in which case we simply ignore attempts | |
4105 | to change its registers. See also the related | |
4106 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4107 | free (buf); |
3221518c UW |
4108 | return 0; |
4109 | } | |
58caa3dc DJ |
4110 | else |
4111 | { | |
ce3a066d | 4112 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4113 | } |
4114 | } | |
e9d25b98 DJ |
4115 | else if (regset->type == GENERAL_REGS) |
4116 | saw_general_regs = 1; | |
58caa3dc | 4117 | regset ++; |
09ec9b38 | 4118 | free (buf); |
58caa3dc | 4119 | } |
e9d25b98 DJ |
4120 | if (saw_general_regs) |
4121 | return 0; | |
4122 | else | |
4123 | return 1; | |
58caa3dc DJ |
4124 | } |
4125 | ||
1faeff08 | 4126 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4127 | |
1faeff08 MR |
4128 | #define use_linux_regsets 0 |
4129 | #define regsets_fetch_inferior_registers(regcache) 1 | |
4130 | #define regsets_store_inferior_registers(regcache) 1 | |
58caa3dc | 4131 | |
58caa3dc | 4132 | #endif |
1faeff08 MR |
4133 | |
4134 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4135 | calls or 0 if it has to be transferred individually. */ | |
4136 | ||
4137 | static int | |
4138 | linux_register_in_regsets (int regno) | |
4139 | { | |
4140 | unsigned char mask = 1 << (regno % 8); | |
4141 | size_t index = regno / 8; | |
4142 | ||
4143 | return (use_linux_regsets | |
4144 | && (the_low_target.regset_bitmap == NULL | |
4145 | || (the_low_target.regset_bitmap[index] & mask) != 0)); | |
4146 | } | |
4147 | ||
58caa3dc | 4148 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4149 | |
4150 | int | |
4151 | register_addr (int regnum) | |
4152 | { | |
4153 | int addr; | |
4154 | ||
4155 | if (regnum < 0 || regnum >= the_low_target.num_regs) | |
4156 | error ("Invalid register number %d.", regnum); | |
4157 | ||
4158 | addr = the_low_target.regmap[regnum]; | |
4159 | ||
4160 | return addr; | |
4161 | } | |
4162 | ||
4163 | /* Fetch one register. */ | |
4164 | static void | |
4165 | fetch_register (struct regcache *regcache, int regno) | |
4166 | { | |
4167 | CORE_ADDR regaddr; | |
4168 | int i, size; | |
4169 | char *buf; | |
4170 | int pid; | |
4171 | ||
4172 | if (regno >= the_low_target.num_regs) | |
4173 | return; | |
4174 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4175 | return; | |
4176 | ||
4177 | regaddr = register_addr (regno); | |
4178 | if (regaddr == -1) | |
4179 | return; | |
4180 | ||
4181 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4182 | & -sizeof (PTRACE_XFER_TYPE)); | |
4183 | buf = alloca (size); | |
4184 | ||
4185 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4186 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4187 | { | |
4188 | errno = 0; | |
4189 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4190 | ptrace (PTRACE_PEEKUSER, pid, | |
4191 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4192 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
4193 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
4194 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4195 | if (errno != 0) | |
4196 | error ("reading register %d: %s", regno, strerror (errno)); | |
4197 | } | |
4198 | ||
4199 | if (the_low_target.supply_ptrace_register) | |
4200 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4201 | else | |
4202 | supply_register (regcache, regno, buf); | |
4203 | } | |
4204 | ||
4205 | /* Store one register. */ | |
4206 | static void | |
4207 | store_register (struct regcache *regcache, int regno) | |
4208 | { | |
4209 | CORE_ADDR regaddr; | |
4210 | int i, size; | |
4211 | char *buf; | |
4212 | int pid; | |
4213 | ||
4214 | if (regno >= the_low_target.num_regs) | |
4215 | return; | |
4216 | if ((*the_low_target.cannot_store_register) (regno)) | |
4217 | return; | |
4218 | ||
4219 | regaddr = register_addr (regno); | |
4220 | if (regaddr == -1) | |
4221 | return; | |
4222 | ||
4223 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4224 | & -sizeof (PTRACE_XFER_TYPE)); | |
4225 | buf = alloca (size); | |
4226 | memset (buf, 0, size); | |
4227 | ||
4228 | if (the_low_target.collect_ptrace_register) | |
4229 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4230 | else | |
4231 | collect_register (regcache, regno, buf); | |
4232 | ||
4233 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4234 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4235 | { | |
4236 | errno = 0; | |
4237 | ptrace (PTRACE_POKEUSER, pid, | |
4238 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4239 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4240 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
4241 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
4242 | if (errno != 0) | |
4243 | { | |
4244 | /* At this point, ESRCH should mean the process is | |
4245 | already gone, in which case we simply ignore attempts | |
4246 | to change its registers. See also the related | |
4247 | comment in linux_resume_one_lwp. */ | |
4248 | if (errno == ESRCH) | |
4249 | return; | |
4250 | ||
4251 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4252 | error ("writing register %d: %s", regno, strerror (errno)); | |
4253 | } | |
4254 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4255 | } | |
4256 | } | |
4257 | ||
4258 | /* Fetch all registers, or just one, from the child process. | |
4259 | If REGNO is -1, do this for all registers, skipping any that are | |
4260 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4261 | unless ALL is non-zero. | |
4262 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4263 | static void | |
4264 | usr_fetch_inferior_registers (struct regcache *regcache, int regno, int all) | |
4265 | { | |
4266 | if (regno == -1) | |
4267 | { | |
4268 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4269 | if (all || !linux_register_in_regsets (regno)) | |
4270 | fetch_register (regcache, regno); | |
4271 | } | |
4272 | else | |
4273 | fetch_register (regcache, regno); | |
4274 | } | |
4275 | ||
4276 | /* Store our register values back into the inferior. | |
4277 | If REGNO is -1, do this for all registers, skipping any that are | |
4278 | assumed to have been saved by regsets_store_inferior_registers, | |
4279 | unless ALL is non-zero. | |
4280 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4281 | static void | |
4282 | usr_store_inferior_registers (struct regcache *regcache, int regno, int all) | |
4283 | { | |
4284 | if (regno == -1) | |
4285 | { | |
4286 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4287 | if (all || !linux_register_in_regsets (regno)) | |
4288 | store_register (regcache, regno); | |
4289 | } | |
4290 | else | |
4291 | store_register (regcache, regno); | |
4292 | } | |
4293 | ||
4294 | #else /* !HAVE_LINUX_USRREGS */ | |
4295 | ||
4296 | #define usr_fetch_inferior_registers(regcache, regno, all) do {} while (0) | |
4297 | #define usr_store_inferior_registers(regcache, regno, all) do {} while (0) | |
4298 | ||
58caa3dc | 4299 | #endif |
1faeff08 MR |
4300 | |
4301 | ||
4302 | void | |
4303 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4304 | { | |
4305 | int use_regsets; | |
4306 | int all = 0; | |
4307 | ||
4308 | if (regno == -1) | |
4309 | { | |
c14dfd32 PA |
4310 | if (the_low_target.fetch_register != NULL) |
4311 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4312 | (*the_low_target.fetch_register) (regcache, regno); | |
4313 | ||
1faeff08 | 4314 | all = regsets_fetch_inferior_registers (regcache); |
c14dfd32 | 4315 | usr_fetch_inferior_registers (regcache, -1, all); |
1faeff08 MR |
4316 | } |
4317 | else | |
4318 | { | |
c14dfd32 PA |
4319 | if (the_low_target.fetch_register != NULL |
4320 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4321 | return; | |
4322 | ||
1faeff08 MR |
4323 | use_regsets = linux_register_in_regsets (regno); |
4324 | if (use_regsets) | |
4325 | all = regsets_fetch_inferior_registers (regcache); | |
4326 | if (!use_regsets || all) | |
4327 | usr_fetch_inferior_registers (regcache, regno, 1); | |
4328 | } | |
58caa3dc DJ |
4329 | } |
4330 | ||
4331 | void | |
442ea881 | 4332 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4333 | { |
1faeff08 MR |
4334 | int use_regsets; |
4335 | int all = 0; | |
4336 | ||
4337 | if (regno == -1) | |
4338 | { | |
4339 | all = regsets_store_inferior_registers (regcache); | |
4340 | usr_store_inferior_registers (regcache, regno, all); | |
4341 | } | |
4342 | else | |
4343 | { | |
4344 | use_regsets = linux_register_in_regsets (regno); | |
4345 | if (use_regsets) | |
4346 | all = regsets_store_inferior_registers (regcache); | |
4347 | if (!use_regsets || all) | |
4348 | usr_store_inferior_registers (regcache, regno, 1); | |
4349 | } | |
58caa3dc DJ |
4350 | } |
4351 | ||
da6d8c04 | 4352 | |
da6d8c04 DJ |
4353 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4354 | to debugger memory starting at MYADDR. */ | |
4355 | ||
c3e735a6 | 4356 | static int |
f450004a | 4357 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
4358 | { |
4359 | register int i; | |
4360 | /* Round starting address down to longword boundary. */ | |
4361 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4362 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
4363 | register int count |
4364 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
4365 | / sizeof (PTRACE_XFER_TYPE); |
4366 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 4367 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 4368 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
4369 | int fd; |
4370 | char filename[64]; | |
95954743 | 4371 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
4372 | |
4373 | /* Try using /proc. Don't bother for one word. */ | |
4374 | if (len >= 3 * sizeof (long)) | |
4375 | { | |
4376 | /* We could keep this file open and cache it - possibly one per | |
4377 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4378 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4379 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4380 | if (fd == -1) | |
4381 | goto no_proc; | |
4382 | ||
4383 | /* If pread64 is available, use it. It's faster if the kernel | |
4384 | supports it (only one syscall), and it's 64-bit safe even on | |
4385 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4386 | application). */ | |
4387 | #ifdef HAVE_PREAD64 | |
4388 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
4389 | #else | |
1de1badb | 4390 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
4391 | #endif |
4392 | { | |
4393 | close (fd); | |
4394 | goto no_proc; | |
4395 | } | |
4396 | ||
4397 | close (fd); | |
4398 | return 0; | |
4399 | } | |
da6d8c04 | 4400 | |
fd462a61 | 4401 | no_proc: |
da6d8c04 DJ |
4402 | /* Read all the longwords */ |
4403 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4404 | { | |
c3e735a6 | 4405 | errno = 0; |
14ce3065 DE |
4406 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4407 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4408 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
4409 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
4410 | if (errno) |
4411 | return errno; | |
da6d8c04 DJ |
4412 | } |
4413 | ||
4414 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
4415 | memcpy (myaddr, |
4416 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4417 | len); | |
c3e735a6 DJ |
4418 | |
4419 | return 0; | |
da6d8c04 DJ |
4420 | } |
4421 | ||
93ae6fdc PA |
4422 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4423 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
4424 | returns the value of errno. */ |
4425 | ||
ce3a066d | 4426 | static int |
f450004a | 4427 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4428 | { |
4429 | register int i; | |
4430 | /* Round starting address down to longword boundary. */ | |
4431 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4432 | /* Round ending address up; get number of longwords that makes. */ | |
4433 | register int count | |
493e2a69 MS |
4434 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4435 | / sizeof (PTRACE_XFER_TYPE); | |
4436 | ||
da6d8c04 | 4437 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4438 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4439 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4440 | ||
95954743 | 4441 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4442 | |
0d62e5e8 DJ |
4443 | if (debug_threads) |
4444 | { | |
58d6951d DJ |
4445 | /* Dump up to four bytes. */ |
4446 | unsigned int val = * (unsigned int *) myaddr; | |
4447 | if (len == 1) | |
4448 | val = val & 0xff; | |
4449 | else if (len == 2) | |
4450 | val = val & 0xffff; | |
4451 | else if (len == 3) | |
4452 | val = val & 0xffffff; | |
4453 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4454 | val, (long)memaddr); | |
0d62e5e8 DJ |
4455 | } |
4456 | ||
da6d8c04 DJ |
4457 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4458 | ||
93ae6fdc | 4459 | errno = 0; |
14ce3065 DE |
4460 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4461 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4462 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
4463 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
4464 | if (errno) |
4465 | return errno; | |
da6d8c04 DJ |
4466 | |
4467 | if (count > 1) | |
4468 | { | |
93ae6fdc | 4469 | errno = 0; |
da6d8c04 | 4470 | buffer[count - 1] |
95954743 | 4471 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4472 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4473 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4474 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4475 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 4476 | 0); |
93ae6fdc PA |
4477 | if (errno) |
4478 | return errno; | |
da6d8c04 DJ |
4479 | } |
4480 | ||
93ae6fdc | 4481 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4482 | |
493e2a69 MS |
4483 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4484 | myaddr, len); | |
da6d8c04 DJ |
4485 | |
4486 | /* Write the entire buffer. */ | |
4487 | ||
4488 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4489 | { | |
4490 | errno = 0; | |
14ce3065 DE |
4491 | ptrace (PTRACE_POKETEXT, pid, |
4492 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4493 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4494 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4495 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4496 | if (errno) |
4497 | return errno; | |
4498 | } | |
4499 | ||
4500 | return 0; | |
4501 | } | |
2f2893d9 | 4502 | |
6076632b | 4503 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4504 | static int linux_supports_tracefork_flag; |
4505 | ||
1e7fc18c PA |
4506 | static void |
4507 | linux_enable_event_reporting (int pid) | |
4508 | { | |
4509 | if (!linux_supports_tracefork_flag) | |
4510 | return; | |
4511 | ||
4512 | ptrace (PTRACE_SETOPTIONS, pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
4513 | } | |
4514 | ||
51c2684e | 4515 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4516 | |
51c2684e DJ |
4517 | static int |
4518 | linux_tracefork_grandchild (void *arg) | |
4519 | { | |
4520 | _exit (0); | |
4521 | } | |
4522 | ||
7407e2de AS |
4523 | #define STACK_SIZE 4096 |
4524 | ||
51c2684e DJ |
4525 | static int |
4526 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
4527 | { |
4528 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
4529 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
4530 | |
4531 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4532 | ||
4533 | if (fork () == 0) | |
4534 | linux_tracefork_grandchild (NULL); | |
4535 | ||
4536 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4537 | ||
7407e2de AS |
4538 | #ifdef __ia64__ |
4539 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4540 | CLONE_VM | SIGCHLD, NULL); | |
4541 | #else | |
a1f2ce7d | 4542 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4543 | CLONE_VM | SIGCHLD, NULL); |
4544 | #endif | |
e4b7f41c JK |
4545 | |
4546 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4547 | ||
24a09b5f DJ |
4548 | _exit (0); |
4549 | } | |
4550 | ||
24a09b5f DJ |
4551 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4552 | sure that we can enable the option, and that it had the desired | |
4553 | effect. */ | |
4554 | ||
4555 | static void | |
4556 | linux_test_for_tracefork (void) | |
4557 | { | |
4558 | int child_pid, ret, status; | |
4559 | long second_pid; | |
e4b7f41c | 4560 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4561 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4562 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4563 | |
4564 | linux_supports_tracefork_flag = 0; | |
4565 | ||
e4b7f41c JK |
4566 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4567 | ||
4568 | child_pid = fork (); | |
4569 | if (child_pid == 0) | |
4570 | linux_tracefork_child (NULL); | |
4571 | ||
4572 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4573 | ||
51c2684e | 4574 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4575 | #ifdef __ia64__ |
4576 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4577 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4578 | #else /* !__ia64__ */ |
7407e2de AS |
4579 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4580 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4581 | #endif /* !__ia64__ */ |
4582 | ||
4583 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4584 | ||
24a09b5f | 4585 | if (child_pid == -1) |
51c2684e | 4586 | perror_with_name ("clone"); |
24a09b5f DJ |
4587 | |
4588 | ret = my_waitpid (child_pid, &status, 0); | |
4589 | if (ret == -1) | |
4590 | perror_with_name ("waitpid"); | |
4591 | else if (ret != child_pid) | |
4592 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4593 | if (! WIFSTOPPED (status)) | |
4594 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4595 | ||
14ce3065 DE |
4596 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
4597 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
4598 | if (ret != 0) |
4599 | { | |
4600 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4601 | if (ret != 0) | |
4602 | { | |
4603 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4604 | return; | |
4605 | } | |
4606 | ||
4607 | ret = my_waitpid (child_pid, &status, 0); | |
4608 | if (ret != child_pid) | |
4609 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4610 | else if (!WIFSIGNALED (status)) | |
4611 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4612 | "killed child", status); | |
4613 | ||
4614 | return; | |
4615 | } | |
4616 | ||
4617 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
4618 | if (ret != 0) | |
4619 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4620 | ||
4621 | ret = my_waitpid (child_pid, &status, 0); | |
4622 | ||
4623 | if (ret == child_pid && WIFSTOPPED (status) | |
4624 | && status >> 16 == PTRACE_EVENT_FORK) | |
4625 | { | |
4626 | second_pid = 0; | |
4627 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
4628 | if (ret == 0 && second_pid != 0) | |
4629 | { | |
4630 | int second_status; | |
4631 | ||
4632 | linux_supports_tracefork_flag = 1; | |
4633 | my_waitpid (second_pid, &second_status, 0); | |
4634 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
4635 | if (ret != 0) | |
4636 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4637 | my_waitpid (second_pid, &status, 0); | |
4638 | } | |
4639 | } | |
4640 | else | |
4641 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4642 | "(%d, status 0x%x)", ret, status); | |
4643 | ||
4644 | do | |
4645 | { | |
4646 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4647 | if (ret != 0) | |
4648 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4649 | my_waitpid (child_pid, &status, 0); | |
4650 | } | |
4651 | while (WIFSTOPPED (status)); | |
51c2684e | 4652 | |
e4b7f41c | 4653 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4654 | free (stack); |
e4b7f41c | 4655 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4656 | } |
4657 | ||
4658 | ||
2f2893d9 DJ |
4659 | static void |
4660 | linux_look_up_symbols (void) | |
4661 | { | |
0d62e5e8 | 4662 | #ifdef USE_THREAD_DB |
95954743 PA |
4663 | struct process_info *proc = current_process (); |
4664 | ||
cdbfd419 | 4665 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4666 | return; |
4667 | ||
6076632b DE |
4668 | /* If the kernel supports tracing forks then it also supports tracing |
4669 | clones, and then we don't need to use the magic thread event breakpoint | |
4670 | to learn about threads. */ | |
cdbfd419 | 4671 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4672 | #endif |
4673 | } | |
4674 | ||
e5379b03 | 4675 | static void |
ef57601b | 4676 | linux_request_interrupt (void) |
e5379b03 | 4677 | { |
a1928bad | 4678 | extern unsigned long signal_pid; |
e5379b03 | 4679 | |
95954743 PA |
4680 | if (!ptid_equal (cont_thread, null_ptid) |
4681 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4682 | { |
54a0b537 | 4683 | struct lwp_info *lwp; |
bd99dc85 | 4684 | int lwpid; |
e5379b03 | 4685 | |
54a0b537 | 4686 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4687 | lwpid = lwpid_of (lwp); |
4688 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4689 | } |
4690 | else | |
ef57601b | 4691 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4692 | } |
4693 | ||
aa691b87 RM |
4694 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4695 | to debugger memory starting at MYADDR. */ | |
4696 | ||
4697 | static int | |
f450004a | 4698 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4699 | { |
4700 | char filename[PATH_MAX]; | |
4701 | int fd, n; | |
95954743 | 4702 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4703 | |
6cebaf6e | 4704 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4705 | |
4706 | fd = open (filename, O_RDONLY); | |
4707 | if (fd < 0) | |
4708 | return -1; | |
4709 | ||
4710 | if (offset != (CORE_ADDR) 0 | |
4711 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4712 | n = -1; | |
4713 | else | |
4714 | n = read (fd, myaddr, len); | |
4715 | ||
4716 | close (fd); | |
4717 | ||
4718 | return n; | |
4719 | } | |
4720 | ||
d993e290 PA |
4721 | /* These breakpoint and watchpoint related wrapper functions simply |
4722 | pass on the function call if the target has registered a | |
4723 | corresponding function. */ | |
e013ee27 OF |
4724 | |
4725 | static int | |
d993e290 | 4726 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4727 | { |
d993e290 PA |
4728 | if (the_low_target.insert_point != NULL) |
4729 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4730 | else |
4731 | /* Unsupported (see target.h). */ | |
4732 | return 1; | |
4733 | } | |
4734 | ||
4735 | static int | |
d993e290 | 4736 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4737 | { |
d993e290 PA |
4738 | if (the_low_target.remove_point != NULL) |
4739 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4740 | else |
4741 | /* Unsupported (see target.h). */ | |
4742 | return 1; | |
4743 | } | |
4744 | ||
4745 | static int | |
4746 | linux_stopped_by_watchpoint (void) | |
4747 | { | |
c3adc08c PA |
4748 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4749 | ||
4750 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4751 | } |
4752 | ||
4753 | static CORE_ADDR | |
4754 | linux_stopped_data_address (void) | |
4755 | { | |
c3adc08c PA |
4756 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4757 | ||
4758 | return lwp->stopped_data_address; | |
e013ee27 OF |
4759 | } |
4760 | ||
42c81e2a | 4761 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
4762 | #if defined(__mcoldfire__) |
4763 | /* These should really be defined in the kernel's ptrace.h header. */ | |
4764 | #define PT_TEXT_ADDR 49*4 | |
4765 | #define PT_DATA_ADDR 50*4 | |
4766 | #define PT_TEXT_END_ADDR 51*4 | |
eb826dc6 MF |
4767 | #elif defined(BFIN) |
4768 | #define PT_TEXT_ADDR 220 | |
4769 | #define PT_TEXT_END_ADDR 224 | |
4770 | #define PT_DATA_ADDR 228 | |
58dbd541 YQ |
4771 | #elif defined(__TMS320C6X__) |
4772 | #define PT_TEXT_ADDR (0x10000*4) | |
4773 | #define PT_DATA_ADDR (0x10004*4) | |
4774 | #define PT_TEXT_END_ADDR (0x10008*4) | |
52fb6437 NS |
4775 | #endif |
4776 | ||
4777 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4778 | to tell gdb about. */ | |
4779 | ||
4780 | static int | |
4781 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4782 | { | |
4783 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
4784 | unsigned long text, text_end, data; | |
bd99dc85 | 4785 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4786 | |
4787 | errno = 0; | |
4788 | ||
4789 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
4790 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
4791 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
4792 | ||
4793 | if (errno == 0) | |
4794 | { | |
4795 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4796 | used by gdb) are relative to the beginning of the program, |
4797 | with the data segment immediately following the text segment. | |
4798 | However, the actual runtime layout in memory may put the data | |
4799 | somewhere else, so when we send gdb a data base-address, we | |
4800 | use the real data base address and subtract the compile-time | |
4801 | data base-address from it (which is just the length of the | |
4802 | text segment). BSS immediately follows data in both | |
4803 | cases. */ | |
52fb6437 NS |
4804 | *text_p = text; |
4805 | *data_p = data - (text_end - text); | |
1b3f6016 | 4806 | |
52fb6437 NS |
4807 | return 1; |
4808 | } | |
4809 | #endif | |
4810 | return 0; | |
4811 | } | |
4812 | #endif | |
4813 | ||
07e059b5 VP |
4814 | static int |
4815 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4816 | unsigned char *readbuf, unsigned const char *writebuf, |
4817 | CORE_ADDR offset, int len) | |
07e059b5 | 4818 | { |
d26e3629 | 4819 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4820 | } |
4821 | ||
d0722149 DE |
4822 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4823 | layout of the inferiors' architecture. */ | |
4824 | ||
4825 | static void | |
a5362b9a | 4826 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4827 | { |
4828 | int done = 0; | |
4829 | ||
4830 | if (the_low_target.siginfo_fixup != NULL) | |
4831 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4832 | ||
4833 | /* If there was no callback, or the callback didn't do anything, | |
4834 | then just do a straight memcpy. */ | |
4835 | if (!done) | |
4836 | { | |
4837 | if (direction == 1) | |
a5362b9a | 4838 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4839 | else |
a5362b9a | 4840 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
4841 | } |
4842 | } | |
4843 | ||
4aa995e1 PA |
4844 | static int |
4845 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4846 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4847 | { | |
d0722149 | 4848 | int pid; |
a5362b9a TS |
4849 | siginfo_t siginfo; |
4850 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
4851 | |
4852 | if (current_inferior == NULL) | |
4853 | return -1; | |
4854 | ||
bd99dc85 | 4855 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4856 | |
4857 | if (debug_threads) | |
d0722149 | 4858 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4859 | readbuf != NULL ? "Reading" : "Writing", |
4860 | pid); | |
4861 | ||
0adea5f7 | 4862 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4863 | return -1; |
4864 | ||
4865 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
4866 | return -1; | |
4867 | ||
d0722149 DE |
4868 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4869 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4870 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4871 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4872 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4873 | ||
4aa995e1 PA |
4874 | if (offset + len > sizeof (siginfo)) |
4875 | len = sizeof (siginfo) - offset; | |
4876 | ||
4877 | if (readbuf != NULL) | |
d0722149 | 4878 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4879 | else |
4880 | { | |
d0722149 DE |
4881 | memcpy (inf_siginfo + offset, writebuf, len); |
4882 | ||
4883 | /* Convert back to ptrace layout before flushing it out. */ | |
4884 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4885 | ||
4aa995e1 PA |
4886 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
4887 | return -1; | |
4888 | } | |
4889 | ||
4890 | return len; | |
4891 | } | |
4892 | ||
bd99dc85 PA |
4893 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4894 | so we notice when children change state; as the handler for the | |
4895 | sigsuspend in my_waitpid. */ | |
4896 | ||
4897 | static void | |
4898 | sigchld_handler (int signo) | |
4899 | { | |
4900 | int old_errno = errno; | |
4901 | ||
4902 | if (debug_threads) | |
e581f2b4 PA |
4903 | { |
4904 | do | |
4905 | { | |
4906 | /* fprintf is not async-signal-safe, so call write | |
4907 | directly. */ | |
4908 | if (write (2, "sigchld_handler\n", | |
4909 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4910 | break; /* just ignore */ | |
4911 | } while (0); | |
4912 | } | |
bd99dc85 PA |
4913 | |
4914 | if (target_is_async_p ()) | |
4915 | async_file_mark (); /* trigger a linux_wait */ | |
4916 | ||
4917 | errno = old_errno; | |
4918 | } | |
4919 | ||
4920 | static int | |
4921 | linux_supports_non_stop (void) | |
4922 | { | |
4923 | return 1; | |
4924 | } | |
4925 | ||
4926 | static int | |
4927 | linux_async (int enable) | |
4928 | { | |
4929 | int previous = (linux_event_pipe[0] != -1); | |
4930 | ||
8336d594 PA |
4931 | if (debug_threads) |
4932 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4933 | enable, previous); | |
4934 | ||
bd99dc85 PA |
4935 | if (previous != enable) |
4936 | { | |
4937 | sigset_t mask; | |
4938 | sigemptyset (&mask); | |
4939 | sigaddset (&mask, SIGCHLD); | |
4940 | ||
4941 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4942 | ||
4943 | if (enable) | |
4944 | { | |
4945 | if (pipe (linux_event_pipe) == -1) | |
4946 | fatal ("creating event pipe failed."); | |
4947 | ||
4948 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4949 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4950 | ||
4951 | /* Register the event loop handler. */ | |
4952 | add_file_handler (linux_event_pipe[0], | |
4953 | handle_target_event, NULL); | |
4954 | ||
4955 | /* Always trigger a linux_wait. */ | |
4956 | async_file_mark (); | |
4957 | } | |
4958 | else | |
4959 | { | |
4960 | delete_file_handler (linux_event_pipe[0]); | |
4961 | ||
4962 | close (linux_event_pipe[0]); | |
4963 | close (linux_event_pipe[1]); | |
4964 | linux_event_pipe[0] = -1; | |
4965 | linux_event_pipe[1] = -1; | |
4966 | } | |
4967 | ||
4968 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4969 | } | |
4970 | ||
4971 | return previous; | |
4972 | } | |
4973 | ||
4974 | static int | |
4975 | linux_start_non_stop (int nonstop) | |
4976 | { | |
4977 | /* Register or unregister from event-loop accordingly. */ | |
4978 | linux_async (nonstop); | |
4979 | return 0; | |
4980 | } | |
4981 | ||
cf8fd78b PA |
4982 | static int |
4983 | linux_supports_multi_process (void) | |
4984 | { | |
4985 | return 1; | |
4986 | } | |
4987 | ||
03583c20 UW |
4988 | static int |
4989 | linux_supports_disable_randomization (void) | |
4990 | { | |
4991 | #ifdef HAVE_PERSONALITY | |
4992 | return 1; | |
4993 | #else | |
4994 | return 0; | |
4995 | #endif | |
4996 | } | |
efcbbd14 | 4997 | |
d1feda86 YQ |
4998 | static int |
4999 | linux_supports_agent (void) | |
5000 | { | |
5001 | return 1; | |
5002 | } | |
5003 | ||
efcbbd14 UW |
5004 | /* Enumerate spufs IDs for process PID. */ |
5005 | static int | |
5006 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5007 | { | |
5008 | int pos = 0; | |
5009 | int written = 0; | |
5010 | char path[128]; | |
5011 | DIR *dir; | |
5012 | struct dirent *entry; | |
5013 | ||
5014 | sprintf (path, "/proc/%ld/fd", pid); | |
5015 | dir = opendir (path); | |
5016 | if (!dir) | |
5017 | return -1; | |
5018 | ||
5019 | rewinddir (dir); | |
5020 | while ((entry = readdir (dir)) != NULL) | |
5021 | { | |
5022 | struct stat st; | |
5023 | struct statfs stfs; | |
5024 | int fd; | |
5025 | ||
5026 | fd = atoi (entry->d_name); | |
5027 | if (!fd) | |
5028 | continue; | |
5029 | ||
5030 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5031 | if (stat (path, &st) != 0) | |
5032 | continue; | |
5033 | if (!S_ISDIR (st.st_mode)) | |
5034 | continue; | |
5035 | ||
5036 | if (statfs (path, &stfs) != 0) | |
5037 | continue; | |
5038 | if (stfs.f_type != SPUFS_MAGIC) | |
5039 | continue; | |
5040 | ||
5041 | if (pos >= offset && pos + 4 <= offset + len) | |
5042 | { | |
5043 | *(unsigned int *)(buf + pos - offset) = fd; | |
5044 | written += 4; | |
5045 | } | |
5046 | pos += 4; | |
5047 | } | |
5048 | ||
5049 | closedir (dir); | |
5050 | return written; | |
5051 | } | |
5052 | ||
5053 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5054 | object type, using the /proc file system. */ | |
5055 | static int | |
5056 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5057 | unsigned const char *writebuf, | |
5058 | CORE_ADDR offset, int len) | |
5059 | { | |
5060 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5061 | char buf[128]; | |
5062 | int fd = 0; | |
5063 | int ret = 0; | |
5064 | ||
5065 | if (!writebuf && !readbuf) | |
5066 | return -1; | |
5067 | ||
5068 | if (!*annex) | |
5069 | { | |
5070 | if (!readbuf) | |
5071 | return -1; | |
5072 | else | |
5073 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5074 | } | |
5075 | ||
5076 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5077 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5078 | if (fd <= 0) | |
5079 | return -1; | |
5080 | ||
5081 | if (offset != 0 | |
5082 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5083 | { | |
5084 | close (fd); | |
5085 | return 0; | |
5086 | } | |
5087 | ||
5088 | if (writebuf) | |
5089 | ret = write (fd, writebuf, (size_t) len); | |
5090 | else | |
5091 | ret = read (fd, readbuf, (size_t) len); | |
5092 | ||
5093 | close (fd); | |
5094 | return ret; | |
5095 | } | |
5096 | ||
723b724b | 5097 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5098 | struct target_loadseg |
5099 | { | |
5100 | /* Core address to which the segment is mapped. */ | |
5101 | Elf32_Addr addr; | |
5102 | /* VMA recorded in the program header. */ | |
5103 | Elf32_Addr p_vaddr; | |
5104 | /* Size of this segment in memory. */ | |
5105 | Elf32_Word p_memsz; | |
5106 | }; | |
5107 | ||
723b724b | 5108 | # if defined PT_GETDSBT |
78d85199 YQ |
5109 | struct target_loadmap |
5110 | { | |
5111 | /* Protocol version number, must be zero. */ | |
5112 | Elf32_Word version; | |
5113 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5114 | unsigned *dsbt_table; | |
5115 | unsigned dsbt_size, dsbt_index; | |
5116 | /* Number of segments in this map. */ | |
5117 | Elf32_Word nsegs; | |
5118 | /* The actual memory map. */ | |
5119 | struct target_loadseg segs[/*nsegs*/]; | |
5120 | }; | |
723b724b MF |
5121 | # define LINUX_LOADMAP PT_GETDSBT |
5122 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5123 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5124 | # else | |
5125 | struct target_loadmap | |
5126 | { | |
5127 | /* Protocol version number, must be zero. */ | |
5128 | Elf32_Half version; | |
5129 | /* Number of segments in this map. */ | |
5130 | Elf32_Half nsegs; | |
5131 | /* The actual memory map. */ | |
5132 | struct target_loadseg segs[/*nsegs*/]; | |
5133 | }; | |
5134 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5135 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5136 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5137 | # endif | |
78d85199 | 5138 | |
78d85199 YQ |
5139 | static int |
5140 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5141 | unsigned char *myaddr, unsigned int len) | |
5142 | { | |
5143 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5144 | int addr = -1; | |
5145 | struct target_loadmap *data = NULL; | |
5146 | unsigned int actual_length, copy_length; | |
5147 | ||
5148 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5149 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5150 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5151 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5152 | else |
5153 | return -1; | |
5154 | ||
723b724b | 5155 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5156 | return -1; |
5157 | ||
5158 | if (data == NULL) | |
5159 | return -1; | |
5160 | ||
5161 | actual_length = sizeof (struct target_loadmap) | |
5162 | + sizeof (struct target_loadseg) * data->nsegs; | |
5163 | ||
5164 | if (offset < 0 || offset > actual_length) | |
5165 | return -1; | |
5166 | ||
5167 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5168 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5169 | return copy_length; | |
5170 | } | |
723b724b MF |
5171 | #else |
5172 | # define linux_read_loadmap NULL | |
5173 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5174 | |
1570b33e L |
5175 | static void |
5176 | linux_process_qsupported (const char *query) | |
5177 | { | |
5178 | if (the_low_target.process_qsupported != NULL) | |
5179 | the_low_target.process_qsupported (query); | |
5180 | } | |
5181 | ||
219f2f23 PA |
5182 | static int |
5183 | linux_supports_tracepoints (void) | |
5184 | { | |
5185 | if (*the_low_target.supports_tracepoints == NULL) | |
5186 | return 0; | |
5187 | ||
5188 | return (*the_low_target.supports_tracepoints) (); | |
5189 | } | |
5190 | ||
5191 | static CORE_ADDR | |
5192 | linux_read_pc (struct regcache *regcache) | |
5193 | { | |
5194 | if (the_low_target.get_pc == NULL) | |
5195 | return 0; | |
5196 | ||
5197 | return (*the_low_target.get_pc) (regcache); | |
5198 | } | |
5199 | ||
5200 | static void | |
5201 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5202 | { | |
5203 | gdb_assert (the_low_target.set_pc != NULL); | |
5204 | ||
5205 | (*the_low_target.set_pc) (regcache, pc); | |
5206 | } | |
5207 | ||
8336d594 PA |
5208 | static int |
5209 | linux_thread_stopped (struct thread_info *thread) | |
5210 | { | |
5211 | return get_thread_lwp (thread)->stopped; | |
5212 | } | |
5213 | ||
5214 | /* This exposes stop-all-threads functionality to other modules. */ | |
5215 | ||
5216 | static void | |
7984d532 | 5217 | linux_pause_all (int freeze) |
8336d594 | 5218 | { |
7984d532 PA |
5219 | stop_all_lwps (freeze, NULL); |
5220 | } | |
5221 | ||
5222 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5223 | modules. */ | |
5224 | ||
5225 | static void | |
5226 | linux_unpause_all (int unfreeze) | |
5227 | { | |
5228 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5229 | } |
5230 | ||
90d74c30 PA |
5231 | static int |
5232 | linux_prepare_to_access_memory (void) | |
5233 | { | |
5234 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5235 | running LWP. */ | |
5236 | if (non_stop) | |
5237 | linux_pause_all (1); | |
5238 | return 0; | |
5239 | } | |
5240 | ||
5241 | static void | |
0146f85b | 5242 | linux_done_accessing_memory (void) |
90d74c30 PA |
5243 | { |
5244 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5245 | running LWP. */ | |
5246 | if (non_stop) | |
5247 | linux_unpause_all (1); | |
5248 | } | |
5249 | ||
fa593d66 PA |
5250 | static int |
5251 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5252 | CORE_ADDR collector, | |
5253 | CORE_ADDR lockaddr, | |
5254 | ULONGEST orig_size, | |
5255 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5256 | CORE_ADDR *trampoline, |
5257 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5258 | unsigned char *jjump_pad_insn, |
5259 | ULONGEST *jjump_pad_insn_size, | |
5260 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5261 | CORE_ADDR *adjusted_insn_addr_end, |
5262 | char *err) | |
fa593d66 PA |
5263 | { |
5264 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5265 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5266 | jump_entry, trampoline, trampoline_size, |
5267 | jjump_pad_insn, jjump_pad_insn_size, | |
5268 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5269 | err); | |
fa593d66 PA |
5270 | } |
5271 | ||
6a271cae PA |
5272 | static struct emit_ops * |
5273 | linux_emit_ops (void) | |
5274 | { | |
5275 | if (the_low_target.emit_ops != NULL) | |
5276 | return (*the_low_target.emit_ops) (); | |
5277 | else | |
5278 | return NULL; | |
5279 | } | |
5280 | ||
405f8e94 SS |
5281 | static int |
5282 | linux_get_min_fast_tracepoint_insn_len (void) | |
5283 | { | |
5284 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5285 | } | |
5286 | ||
2268b414 JK |
5287 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5288 | ||
5289 | static int | |
5290 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5291 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5292 | { | |
5293 | char filename[PATH_MAX]; | |
5294 | int fd; | |
5295 | const int auxv_size = is_elf64 | |
5296 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5297 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5298 | ||
5299 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5300 | ||
5301 | fd = open (filename, O_RDONLY); | |
5302 | if (fd < 0) | |
5303 | return 1; | |
5304 | ||
5305 | *phdr_memaddr = 0; | |
5306 | *num_phdr = 0; | |
5307 | while (read (fd, buf, auxv_size) == auxv_size | |
5308 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5309 | { | |
5310 | if (is_elf64) | |
5311 | { | |
5312 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5313 | ||
5314 | switch (aux->a_type) | |
5315 | { | |
5316 | case AT_PHDR: | |
5317 | *phdr_memaddr = aux->a_un.a_val; | |
5318 | break; | |
5319 | case AT_PHNUM: | |
5320 | *num_phdr = aux->a_un.a_val; | |
5321 | break; | |
5322 | } | |
5323 | } | |
5324 | else | |
5325 | { | |
5326 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5327 | ||
5328 | switch (aux->a_type) | |
5329 | { | |
5330 | case AT_PHDR: | |
5331 | *phdr_memaddr = aux->a_un.a_val; | |
5332 | break; | |
5333 | case AT_PHNUM: | |
5334 | *num_phdr = aux->a_un.a_val; | |
5335 | break; | |
5336 | } | |
5337 | } | |
5338 | } | |
5339 | ||
5340 | close (fd); | |
5341 | ||
5342 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5343 | { | |
5344 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5345 | "phdr_memaddr = %ld, phdr_num = %d", | |
5346 | (long) *phdr_memaddr, *num_phdr); | |
5347 | return 2; | |
5348 | } | |
5349 | ||
5350 | return 0; | |
5351 | } | |
5352 | ||
5353 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5354 | ||
5355 | static CORE_ADDR | |
5356 | get_dynamic (const int pid, const int is_elf64) | |
5357 | { | |
5358 | CORE_ADDR phdr_memaddr, relocation; | |
5359 | int num_phdr, i; | |
5360 | unsigned char *phdr_buf; | |
5361 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5362 | ||
5363 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5364 | return 0; | |
5365 | ||
5366 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5367 | phdr_buf = alloca (num_phdr * phdr_size); | |
5368 | ||
5369 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5370 | return 0; | |
5371 | ||
5372 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5373 | non-zero for PIE ones. */ | |
5374 | relocation = -1; | |
5375 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5376 | if (is_elf64) | |
5377 | { | |
5378 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5379 | ||
5380 | if (p->p_type == PT_PHDR) | |
5381 | relocation = phdr_memaddr - p->p_vaddr; | |
5382 | } | |
5383 | else | |
5384 | { | |
5385 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5386 | ||
5387 | if (p->p_type == PT_PHDR) | |
5388 | relocation = phdr_memaddr - p->p_vaddr; | |
5389 | } | |
5390 | ||
5391 | if (relocation == -1) | |
5392 | { | |
e237a7e2 JK |
5393 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5394 | any real world executables, including PIE executables, have always | |
5395 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5396 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5397 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5398 | ||
5399 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5400 | ||
5401 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5402 | ||
2268b414 JK |
5403 | return 0; |
5404 | } | |
5405 | ||
5406 | for (i = 0; i < num_phdr; i++) | |
5407 | { | |
5408 | if (is_elf64) | |
5409 | { | |
5410 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5411 | ||
5412 | if (p->p_type == PT_DYNAMIC) | |
5413 | return p->p_vaddr + relocation; | |
5414 | } | |
5415 | else | |
5416 | { | |
5417 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5418 | ||
5419 | if (p->p_type == PT_DYNAMIC) | |
5420 | return p->p_vaddr + relocation; | |
5421 | } | |
5422 | } | |
5423 | ||
5424 | return 0; | |
5425 | } | |
5426 | ||
5427 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5428 | can be 0 if the inferior does not yet have the library list initialized. |
5429 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5430 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5431 | |
5432 | static CORE_ADDR | |
5433 | get_r_debug (const int pid, const int is_elf64) | |
5434 | { | |
5435 | CORE_ADDR dynamic_memaddr; | |
5436 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5437 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5438 | CORE_ADDR map = -1; |
2268b414 JK |
5439 | |
5440 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5441 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5442 | return map; |
2268b414 JK |
5443 | |
5444 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5445 | { | |
5446 | if (is_elf64) | |
5447 | { | |
5448 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
367ba2c2 MR |
5449 | union |
5450 | { | |
5451 | Elf64_Xword map; | |
5452 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5453 | } | |
5454 | rld_map; | |
5455 | ||
5456 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5457 | { | |
5458 | if (linux_read_memory (dyn->d_un.d_val, | |
5459 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5460 | return rld_map.map; | |
5461 | else | |
5462 | break; | |
5463 | } | |
2268b414 | 5464 | |
367ba2c2 MR |
5465 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5466 | map = dyn->d_un.d_val; | |
2268b414 JK |
5467 | |
5468 | if (dyn->d_tag == DT_NULL) | |
5469 | break; | |
5470 | } | |
5471 | else | |
5472 | { | |
5473 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
367ba2c2 MR |
5474 | union |
5475 | { | |
5476 | Elf32_Word map; | |
5477 | unsigned char buf[sizeof (Elf32_Word)]; | |
5478 | } | |
5479 | rld_map; | |
5480 | ||
5481 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5482 | { | |
5483 | if (linux_read_memory (dyn->d_un.d_val, | |
5484 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5485 | return rld_map.map; | |
5486 | else | |
5487 | break; | |
5488 | } | |
2268b414 | 5489 | |
367ba2c2 MR |
5490 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5491 | map = dyn->d_un.d_val; | |
2268b414 JK |
5492 | |
5493 | if (dyn->d_tag == DT_NULL) | |
5494 | break; | |
5495 | } | |
5496 | ||
5497 | dynamic_memaddr += dyn_size; | |
5498 | } | |
5499 | ||
367ba2c2 | 5500 | return map; |
2268b414 JK |
5501 | } |
5502 | ||
5503 | /* Read one pointer from MEMADDR in the inferior. */ | |
5504 | ||
5505 | static int | |
5506 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5507 | { | |
485f1ee4 PA |
5508 | int ret; |
5509 | ||
5510 | /* Go through a union so this works on either big or little endian | |
5511 | hosts, when the inferior's pointer size is smaller than the size | |
5512 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5513 | same of the superior's. */ | |
5514 | union | |
5515 | { | |
5516 | CORE_ADDR core_addr; | |
5517 | unsigned int ui; | |
5518 | unsigned char uc; | |
5519 | } addr; | |
5520 | ||
5521 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5522 | if (ret == 0) | |
5523 | { | |
5524 | if (ptr_size == sizeof (CORE_ADDR)) | |
5525 | *ptr = addr.core_addr; | |
5526 | else if (ptr_size == sizeof (unsigned int)) | |
5527 | *ptr = addr.ui; | |
5528 | else | |
5529 | gdb_assert_not_reached ("unhandled pointer size"); | |
5530 | } | |
5531 | return ret; | |
2268b414 JK |
5532 | } |
5533 | ||
5534 | struct link_map_offsets | |
5535 | { | |
5536 | /* Offset and size of r_debug.r_version. */ | |
5537 | int r_version_offset; | |
5538 | ||
5539 | /* Offset and size of r_debug.r_map. */ | |
5540 | int r_map_offset; | |
5541 | ||
5542 | /* Offset to l_addr field in struct link_map. */ | |
5543 | int l_addr_offset; | |
5544 | ||
5545 | /* Offset to l_name field in struct link_map. */ | |
5546 | int l_name_offset; | |
5547 | ||
5548 | /* Offset to l_ld field in struct link_map. */ | |
5549 | int l_ld_offset; | |
5550 | ||
5551 | /* Offset to l_next field in struct link_map. */ | |
5552 | int l_next_offset; | |
5553 | ||
5554 | /* Offset to l_prev field in struct link_map. */ | |
5555 | int l_prev_offset; | |
5556 | }; | |
5557 | ||
fb723180 | 5558 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5559 | |
5560 | static int | |
5561 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5562 | unsigned const char *writebuf, | |
5563 | CORE_ADDR offset, int len) | |
5564 | { | |
5565 | char *document; | |
5566 | unsigned document_len; | |
5567 | struct process_info_private *const priv = current_process ()->private; | |
5568 | char filename[PATH_MAX]; | |
5569 | int pid, is_elf64; | |
5570 | ||
5571 | static const struct link_map_offsets lmo_32bit_offsets = | |
5572 | { | |
5573 | 0, /* r_version offset. */ | |
5574 | 4, /* r_debug.r_map offset. */ | |
5575 | 0, /* l_addr offset in link_map. */ | |
5576 | 4, /* l_name offset in link_map. */ | |
5577 | 8, /* l_ld offset in link_map. */ | |
5578 | 12, /* l_next offset in link_map. */ | |
5579 | 16 /* l_prev offset in link_map. */ | |
5580 | }; | |
5581 | ||
5582 | static const struct link_map_offsets lmo_64bit_offsets = | |
5583 | { | |
5584 | 0, /* r_version offset. */ | |
5585 | 8, /* r_debug.r_map offset. */ | |
5586 | 0, /* l_addr offset in link_map. */ | |
5587 | 8, /* l_name offset in link_map. */ | |
5588 | 16, /* l_ld offset in link_map. */ | |
5589 | 24, /* l_next offset in link_map. */ | |
5590 | 32 /* l_prev offset in link_map. */ | |
5591 | }; | |
5592 | const struct link_map_offsets *lmo; | |
214d508e | 5593 | unsigned int machine; |
2268b414 JK |
5594 | |
5595 | if (writebuf != NULL) | |
5596 | return -2; | |
5597 | if (readbuf == NULL) | |
5598 | return -1; | |
5599 | ||
5600 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5601 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
214d508e | 5602 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 JK |
5603 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
5604 | ||
5605 | if (priv->r_debug == 0) | |
5606 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5607 | ||
5608 | if (priv->r_debug == (CORE_ADDR) -1 || priv->r_debug == 0) | |
5609 | { | |
5610 | document = xstrdup ("<library-list-svr4 version=\"1.0\"/>\n"); | |
5611 | } | |
5612 | else | |
5613 | { | |
5614 | int allocated = 1024; | |
5615 | char *p; | |
5616 | const int ptr_size = is_elf64 ? 8 : 4; | |
5617 | CORE_ADDR lm_addr, lm_prev, l_name, l_addr, l_ld, l_next, l_prev; | |
5618 | int r_version, header_done = 0; | |
5619 | ||
5620 | document = xmalloc (allocated); | |
5621 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5622 | p = document + strlen (document); | |
5623 | ||
5624 | r_version = 0; | |
5625 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, | |
5626 | (unsigned char *) &r_version, | |
5627 | sizeof (r_version)) != 0 | |
5628 | || r_version != 1) | |
5629 | { | |
5630 | warning ("unexpected r_debug version %d", r_version); | |
5631 | goto done; | |
5632 | } | |
5633 | ||
5634 | if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5635 | &lm_addr, ptr_size) != 0) | |
5636 | { | |
5637 | warning ("unable to read r_map from 0x%lx", | |
5638 | (long) priv->r_debug + lmo->r_map_offset); | |
5639 | goto done; | |
5640 | } | |
5641 | ||
5642 | lm_prev = 0; | |
5643 | while (read_one_ptr (lm_addr + lmo->l_name_offset, | |
5644 | &l_name, ptr_size) == 0 | |
5645 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5646 | &l_addr, ptr_size) == 0 | |
5647 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5648 | &l_ld, ptr_size) == 0 | |
5649 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5650 | &l_prev, ptr_size) == 0 | |
5651 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5652 | &l_next, ptr_size) == 0) | |
5653 | { | |
5654 | unsigned char libname[PATH_MAX]; | |
5655 | ||
5656 | if (lm_prev != l_prev) | |
5657 | { | |
5658 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", | |
5659 | (long) lm_prev, (long) l_prev); | |
5660 | break; | |
5661 | } | |
5662 | ||
5663 | /* Not checking for error because reading may stop before | |
5664 | we've got PATH_MAX worth of characters. */ | |
5665 | libname[0] = '\0'; | |
5666 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5667 | libname[sizeof (libname) - 1] = '\0'; | |
5668 | if (libname[0] != '\0') | |
5669 | { | |
5670 | /* 6x the size for xml_escape_text below. */ | |
5671 | size_t len = 6 * strlen ((char *) libname); | |
5672 | char *name; | |
5673 | ||
5674 | if (!header_done) | |
5675 | { | |
5676 | /* Terminate `<library-list-svr4'. */ | |
5677 | *p++ = '>'; | |
5678 | header_done = 1; | |
5679 | } | |
5680 | ||
5681 | while (allocated < p - document + len + 200) | |
5682 | { | |
5683 | /* Expand to guarantee sufficient storage. */ | |
5684 | uintptr_t document_len = p - document; | |
5685 | ||
5686 | document = xrealloc (document, 2 * allocated); | |
5687 | allocated *= 2; | |
5688 | p = document + document_len; | |
5689 | } | |
5690 | ||
5691 | name = xml_escape_text ((char *) libname); | |
5692 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5693 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5694 | name, (unsigned long) lm_addr, | |
5695 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5696 | free (name); | |
5697 | } | |
5698 | else if (lm_prev == 0) | |
5699 | { | |
5700 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); | |
5701 | p = p + strlen (p); | |
5702 | } | |
5703 | ||
5704 | if (l_next == 0) | |
5705 | break; | |
5706 | ||
5707 | lm_prev = lm_addr; | |
5708 | lm_addr = l_next; | |
5709 | } | |
5710 | done: | |
0afae3cf PA |
5711 | if (!header_done) |
5712 | { | |
5713 | /* Empty list; terminate `<library-list-svr4'. */ | |
5714 | strcpy (p, "/>"); | |
5715 | } | |
5716 | else | |
5717 | strcpy (p, "</library-list-svr4>"); | |
2268b414 JK |
5718 | } |
5719 | ||
5720 | document_len = strlen (document); | |
5721 | if (offset < document_len) | |
5722 | document_len -= offset; | |
5723 | else | |
5724 | document_len = 0; | |
5725 | if (len > document_len) | |
5726 | len = document_len; | |
5727 | ||
5728 | memcpy (readbuf, document + offset, len); | |
5729 | xfree (document); | |
5730 | ||
5731 | return len; | |
5732 | } | |
5733 | ||
ce3a066d DJ |
5734 | static struct target_ops linux_target_ops = { |
5735 | linux_create_inferior, | |
5736 | linux_attach, | |
5737 | linux_kill, | |
6ad8ae5c | 5738 | linux_detach, |
8336d594 | 5739 | linux_mourn, |
444d6139 | 5740 | linux_join, |
ce3a066d DJ |
5741 | linux_thread_alive, |
5742 | linux_resume, | |
5743 | linux_wait, | |
5744 | linux_fetch_registers, | |
5745 | linux_store_registers, | |
90d74c30 | 5746 | linux_prepare_to_access_memory, |
0146f85b | 5747 | linux_done_accessing_memory, |
ce3a066d DJ |
5748 | linux_read_memory, |
5749 | linux_write_memory, | |
2f2893d9 | 5750 | linux_look_up_symbols, |
ef57601b | 5751 | linux_request_interrupt, |
aa691b87 | 5752 | linux_read_auxv, |
d993e290 PA |
5753 | linux_insert_point, |
5754 | linux_remove_point, | |
e013ee27 OF |
5755 | linux_stopped_by_watchpoint, |
5756 | linux_stopped_data_address, | |
42c81e2a | 5757 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 5758 | linux_read_offsets, |
dae5f5cf DJ |
5759 | #else |
5760 | NULL, | |
5761 | #endif | |
5762 | #ifdef USE_THREAD_DB | |
5763 | thread_db_get_tls_address, | |
5764 | #else | |
5765 | NULL, | |
52fb6437 | 5766 | #endif |
efcbbd14 | 5767 | linux_qxfer_spu, |
59a016f0 | 5768 | hostio_last_error_from_errno, |
07e059b5 | 5769 | linux_qxfer_osdata, |
4aa995e1 | 5770 | linux_xfer_siginfo, |
bd99dc85 PA |
5771 | linux_supports_non_stop, |
5772 | linux_async, | |
5773 | linux_start_non_stop, | |
cdbfd419 PP |
5774 | linux_supports_multi_process, |
5775 | #ifdef USE_THREAD_DB | |
dc146f7c | 5776 | thread_db_handle_monitor_command, |
cdbfd419 | 5777 | #else |
dc146f7c | 5778 | NULL, |
cdbfd419 | 5779 | #endif |
d26e3629 | 5780 | linux_common_core_of_thread, |
78d85199 | 5781 | linux_read_loadmap, |
219f2f23 PA |
5782 | linux_process_qsupported, |
5783 | linux_supports_tracepoints, | |
5784 | linux_read_pc, | |
8336d594 PA |
5785 | linux_write_pc, |
5786 | linux_thread_stopped, | |
7984d532 | 5787 | NULL, |
711e434b | 5788 | linux_pause_all, |
7984d532 | 5789 | linux_unpause_all, |
fa593d66 PA |
5790 | linux_cancel_breakpoints, |
5791 | linux_stabilize_threads, | |
6a271cae | 5792 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
5793 | linux_emit_ops, |
5794 | linux_supports_disable_randomization, | |
405f8e94 | 5795 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 5796 | linux_qxfer_libraries_svr4, |
d1feda86 | 5797 | linux_supports_agent, |
ce3a066d DJ |
5798 | }; |
5799 | ||
0d62e5e8 DJ |
5800 | static void |
5801 | linux_init_signals () | |
5802 | { | |
5803 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5804 | to find what the cancel signal actually is. */ | |
1a981360 | 5805 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5806 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5807 | #endif |
0d62e5e8 DJ |
5808 | } |
5809 | ||
da6d8c04 DJ |
5810 | void |
5811 | initialize_low (void) | |
5812 | { | |
bd99dc85 PA |
5813 | struct sigaction sigchld_action; |
5814 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5815 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5816 | set_breakpoint_data (the_low_target.breakpoint, |
5817 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5818 | linux_init_signals (); |
24a09b5f | 5819 | linux_test_for_tracefork (); |
52fa2412 UW |
5820 | #ifdef HAVE_LINUX_REGSETS |
5821 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
5822 | ; | |
bca929d3 | 5823 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 5824 | #endif |
bd99dc85 PA |
5825 | |
5826 | sigchld_action.sa_handler = sigchld_handler; | |
5827 | sigemptyset (&sigchld_action.sa_mask); | |
5828 | sigchld_action.sa_flags = SA_RESTART; | |
5829 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 5830 | } |