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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
28e7fd62 | 2 | Copyright (C) 1995-2013 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 | |
8bdce1ff | 24 | #include "gdb_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> | |
8bdce1ff | 43 | #include "gdb_stat.h" |
efcbbd14 | 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__)) | |
23512c01 MGD |
81 | /* PTRACE_TEXT_ADDR and friends. */ |
82 | #include <asm/ptrace.h> | |
42c81e2a DJ |
83 | #define HAS_NOMMU |
84 | #endif | |
85 | #endif | |
86 | ||
9accd112 MM |
87 | #ifdef HAVE_LINUX_BTRACE |
88 | # include "linux-btrace.h" | |
89 | #endif | |
90 | ||
8365dcf5 TJB |
91 | #ifndef HAVE_ELF32_AUXV_T |
92 | /* Copied from glibc's elf.h. */ | |
93 | typedef struct | |
94 | { | |
95 | uint32_t a_type; /* Entry type */ | |
96 | union | |
97 | { | |
98 | uint32_t a_val; /* Integer value */ | |
99 | /* We use to have pointer elements added here. We cannot do that, | |
100 | though, since it does not work when using 32-bit definitions | |
101 | on 64-bit platforms and vice versa. */ | |
102 | } a_un; | |
103 | } Elf32_auxv_t; | |
104 | #endif | |
105 | ||
106 | #ifndef HAVE_ELF64_AUXV_T | |
107 | /* Copied from glibc's elf.h. */ | |
108 | typedef struct | |
109 | { | |
110 | uint64_t a_type; /* Entry type */ | |
111 | union | |
112 | { | |
113 | uint64_t a_val; /* Integer value */ | |
114 | /* We use to have pointer elements added here. We cannot do that, | |
115 | though, since it does not work when using 32-bit definitions | |
116 | on 64-bit platforms and vice versa. */ | |
117 | } a_un; | |
118 | } Elf64_auxv_t; | |
119 | #endif | |
120 | ||
24a09b5f DJ |
121 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
122 | representation of the thread ID. | |
611cb4a5 | 123 | |
54a0b537 | 124 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
125 | the same as the LWP ID. |
126 | ||
127 | ``all_processes'' is keyed by the "overall process ID", which | |
128 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 129 | |
54a0b537 | 130 | struct inferior_list all_lwps; |
0d62e5e8 | 131 | |
05044653 PA |
132 | /* A list of all unknown processes which receive stop signals. Some |
133 | other process will presumably claim each of these as forked | |
134 | children momentarily. */ | |
24a09b5f | 135 | |
05044653 PA |
136 | struct simple_pid_list |
137 | { | |
138 | /* The process ID. */ | |
139 | int pid; | |
140 | ||
141 | /* The status as reported by waitpid. */ | |
142 | int status; | |
143 | ||
144 | /* Next in chain. */ | |
145 | struct simple_pid_list *next; | |
146 | }; | |
147 | struct simple_pid_list *stopped_pids; | |
148 | ||
149 | /* Trivial list manipulation functions to keep track of a list of new | |
150 | stopped processes. */ | |
151 | ||
152 | static void | |
153 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
154 | { | |
155 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
156 | ||
157 | new_pid->pid = pid; | |
158 | new_pid->status = status; | |
159 | new_pid->next = *listp; | |
160 | *listp = new_pid; | |
161 | } | |
162 | ||
163 | static int | |
164 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
165 | { | |
166 | struct simple_pid_list **p; | |
167 | ||
168 | for (p = listp; *p != NULL; p = &(*p)->next) | |
169 | if ((*p)->pid == pid) | |
170 | { | |
171 | struct simple_pid_list *next = (*p)->next; | |
172 | ||
173 | *statusp = (*p)->status; | |
174 | xfree (*p); | |
175 | *p = next; | |
176 | return 1; | |
177 | } | |
178 | return 0; | |
179 | } | |
24a09b5f | 180 | |
bde24c0a PA |
181 | enum stopping_threads_kind |
182 | { | |
183 | /* Not stopping threads presently. */ | |
184 | NOT_STOPPING_THREADS, | |
185 | ||
186 | /* Stopping threads. */ | |
187 | STOPPING_THREADS, | |
188 | ||
189 | /* Stopping and suspending threads. */ | |
190 | STOPPING_AND_SUSPENDING_THREADS | |
191 | }; | |
192 | ||
193 | /* This is set while stop_all_lwps is in effect. */ | |
194 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
195 | |
196 | /* FIXME make into a target method? */ | |
24a09b5f | 197 | int using_threads = 1; |
24a09b5f | 198 | |
fa593d66 PA |
199 | /* True if we're presently stabilizing threads (moving them out of |
200 | jump pads). */ | |
201 | static int stabilizing_threads; | |
202 | ||
95954743 PA |
203 | /* This flag is true iff we've just created or attached to our first |
204 | inferior but it has not stopped yet. As soon as it does, we need | |
205 | to call the low target's arch_setup callback. Doing this only on | |
206 | the first inferior avoids reinializing the architecture on every | |
207 | inferior, and avoids messing with the register caches of the | |
208 | already running inferiors. NOTE: this assumes all inferiors under | |
209 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
210 | static int new_inferior; |
211 | ||
2acc282a | 212 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 213 | int step, int signal, siginfo_t *info); |
2bd7c093 | 214 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
215 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
216 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 217 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 218 | static void *add_lwp (ptid_t ptid); |
c35fafde | 219 | static int linux_stopped_by_watchpoint (void); |
95954743 | 220 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 221 | static void proceed_all_lwps (void); |
d50171e4 PA |
222 | static int finish_step_over (struct lwp_info *lwp); |
223 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
224 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 225 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
226 | |
227 | /* True if the low target can hardware single-step. Such targets | |
228 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
229 | ||
230 | static int | |
231 | can_hardware_single_step (void) | |
232 | { | |
233 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
234 | } | |
235 | ||
236 | /* True if the low target supports memory breakpoints. If so, we'll | |
237 | have a GET_PC implementation. */ | |
238 | ||
239 | static int | |
240 | supports_breakpoints (void) | |
241 | { | |
242 | return (the_low_target.get_pc != NULL); | |
243 | } | |
0d62e5e8 | 244 | |
fa593d66 PA |
245 | /* Returns true if this target can support fast tracepoints. This |
246 | does not mean that the in-process agent has been loaded in the | |
247 | inferior. */ | |
248 | ||
249 | static int | |
250 | supports_fast_tracepoints (void) | |
251 | { | |
252 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
253 | } | |
254 | ||
0d62e5e8 DJ |
255 | struct pending_signals |
256 | { | |
257 | int signal; | |
32ca6d61 | 258 | siginfo_t info; |
0d62e5e8 DJ |
259 | struct pending_signals *prev; |
260 | }; | |
611cb4a5 | 261 | |
58caa3dc | 262 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
263 | static char *disabled_regsets; |
264 | static int num_regsets; | |
58caa3dc DJ |
265 | #endif |
266 | ||
bd99dc85 PA |
267 | /* The read/write ends of the pipe registered as waitable file in the |
268 | event loop. */ | |
269 | static int linux_event_pipe[2] = { -1, -1 }; | |
270 | ||
271 | /* True if we're currently in async mode. */ | |
272 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
273 | ||
02fc4de7 | 274 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
275 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
276 | ||
d0722149 DE |
277 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
278 | ||
279 | static int | |
214d508e | 280 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 281 | { |
214d508e L |
282 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
283 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
284 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
285 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
286 | { | |
287 | *machine = header->e_machine; | |
288 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
289 | ||
290 | } | |
291 | *machine = EM_NONE; | |
292 | return -1; | |
d0722149 DE |
293 | } |
294 | ||
295 | /* Return non-zero if FILE is a 64-bit ELF file, | |
296 | zero if the file is not a 64-bit ELF file, | |
297 | and -1 if the file is not accessible or doesn't exist. */ | |
298 | ||
be07f1a2 | 299 | static int |
214d508e | 300 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 301 | { |
957f3f49 | 302 | Elf64_Ehdr header; |
d0722149 DE |
303 | int fd; |
304 | ||
305 | fd = open (file, O_RDONLY); | |
306 | if (fd < 0) | |
307 | return -1; | |
308 | ||
309 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
310 | { | |
311 | close (fd); | |
312 | return 0; | |
313 | } | |
314 | close (fd); | |
315 | ||
214d508e | 316 | return elf_64_header_p (&header, machine); |
d0722149 DE |
317 | } |
318 | ||
be07f1a2 PA |
319 | /* Accepts an integer PID; Returns true if the executable PID is |
320 | running is a 64-bit ELF file.. */ | |
321 | ||
322 | int | |
214d508e | 323 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 PA |
324 | { |
325 | char file[MAXPATHLEN]; | |
326 | ||
327 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 328 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
329 | } |
330 | ||
bd99dc85 PA |
331 | static void |
332 | delete_lwp (struct lwp_info *lwp) | |
333 | { | |
334 | remove_thread (get_lwp_thread (lwp)); | |
335 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 336 | free (lwp->arch_private); |
bd99dc85 PA |
337 | free (lwp); |
338 | } | |
339 | ||
95954743 PA |
340 | /* Add a process to the common process list, and set its private |
341 | data. */ | |
342 | ||
343 | static struct process_info * | |
344 | linux_add_process (int pid, int attached) | |
345 | { | |
346 | struct process_info *proc; | |
347 | ||
348 | /* Is this the first process? If so, then set the arch. */ | |
349 | if (all_processes.head == NULL) | |
350 | new_inferior = 1; | |
351 | ||
352 | proc = add_process (pid, attached); | |
353 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
354 | ||
aa5ca48f DE |
355 | if (the_low_target.new_process != NULL) |
356 | proc->private->arch_private = the_low_target.new_process (); | |
357 | ||
95954743 PA |
358 | return proc; |
359 | } | |
360 | ||
07d4f67e DE |
361 | /* Wrapper function for waitpid which handles EINTR, and emulates |
362 | __WALL for systems where that is not available. */ | |
363 | ||
364 | static int | |
365 | my_waitpid (int pid, int *status, int flags) | |
366 | { | |
367 | int ret, out_errno; | |
368 | ||
369 | if (debug_threads) | |
370 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
371 | ||
372 | if (flags & __WALL) | |
373 | { | |
374 | sigset_t block_mask, org_mask, wake_mask; | |
375 | int wnohang; | |
376 | ||
377 | wnohang = (flags & WNOHANG) != 0; | |
378 | flags &= ~(__WALL | __WCLONE); | |
379 | flags |= WNOHANG; | |
380 | ||
381 | /* Block all signals while here. This avoids knowing about | |
382 | LinuxThread's signals. */ | |
383 | sigfillset (&block_mask); | |
384 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
385 | ||
386 | /* ... except during the sigsuspend below. */ | |
387 | sigemptyset (&wake_mask); | |
388 | ||
389 | while (1) | |
390 | { | |
391 | /* Since all signals are blocked, there's no need to check | |
392 | for EINTR here. */ | |
393 | ret = waitpid (pid, status, flags); | |
394 | out_errno = errno; | |
395 | ||
396 | if (ret == -1 && out_errno != ECHILD) | |
397 | break; | |
398 | else if (ret > 0) | |
399 | break; | |
400 | ||
401 | if (flags & __WCLONE) | |
402 | { | |
403 | /* We've tried both flavors now. If WNOHANG is set, | |
404 | there's nothing else to do, just bail out. */ | |
405 | if (wnohang) | |
406 | break; | |
407 | ||
408 | if (debug_threads) | |
409 | fprintf (stderr, "blocking\n"); | |
410 | ||
411 | /* Block waiting for signals. */ | |
412 | sigsuspend (&wake_mask); | |
413 | } | |
414 | ||
415 | flags ^= __WCLONE; | |
416 | } | |
417 | ||
418 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
419 | } | |
420 | else | |
421 | { | |
422 | do | |
423 | ret = waitpid (pid, status, flags); | |
424 | while (ret == -1 && errno == EINTR); | |
425 | out_errno = errno; | |
426 | } | |
427 | ||
428 | if (debug_threads) | |
429 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
430 | pid, flags, status ? *status : -1, ret); | |
431 | ||
432 | errno = out_errno; | |
433 | return ret; | |
434 | } | |
435 | ||
bd99dc85 PA |
436 | /* Handle a GNU/Linux extended wait response. If we see a clone |
437 | event, we need to add the new LWP to our list (and not report the | |
438 | trap to higher layers). */ | |
0d62e5e8 | 439 | |
24a09b5f | 440 | static void |
54a0b537 | 441 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
442 | { |
443 | int event = wstat >> 16; | |
54a0b537 | 444 | struct lwp_info *new_lwp; |
24a09b5f DJ |
445 | |
446 | if (event == PTRACE_EVENT_CLONE) | |
447 | { | |
95954743 | 448 | ptid_t ptid; |
24a09b5f | 449 | unsigned long new_pid; |
05044653 | 450 | int ret, status; |
24a09b5f | 451 | |
56f7af9c MS |
452 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), (PTRACE_ARG3_TYPE) 0, |
453 | &new_pid); | |
24a09b5f DJ |
454 | |
455 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 456 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
457 | { |
458 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
459 | hits the SIGSTOP, but we're already attached. */ | |
460 | ||
97438e3f | 461 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
462 | |
463 | if (ret == -1) | |
464 | perror_with_name ("waiting for new child"); | |
465 | else if (ret != new_pid) | |
466 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 467 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
468 | warning ("wait returned unexpected status 0x%x", status); |
469 | } | |
470 | ||
95954743 PA |
471 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
472 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
473 | add_thread (ptid, new_lwp); | |
24a09b5f | 474 | |
e27d73f6 DE |
475 | /* Either we're going to immediately resume the new thread |
476 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
477 | thinks the thread is currently running, so set this first | |
478 | before calling linux_resume_one_lwp. */ | |
479 | new_lwp->stopped = 1; | |
480 | ||
bde24c0a PA |
481 | /* If we're suspending all threads, leave this one suspended |
482 | too. */ | |
483 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
484 | new_lwp->suspended = 1; | |
485 | ||
da5898ce DJ |
486 | /* Normally we will get the pending SIGSTOP. But in some cases |
487 | we might get another signal delivered to the group first. | |
f21cc1a2 | 488 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
489 | if (WSTOPSIG (status) == SIGSTOP) |
490 | { | |
bde24c0a | 491 | if (stopping_threads != NOT_STOPPING_THREADS) |
d50171e4 PA |
492 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
493 | else | |
e27d73f6 | 494 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 495 | } |
24a09b5f | 496 | else |
da5898ce | 497 | { |
54a0b537 | 498 | new_lwp->stop_expected = 1; |
d50171e4 | 499 | |
bde24c0a | 500 | if (stopping_threads != NOT_STOPPING_THREADS) |
da5898ce | 501 | { |
d50171e4 | 502 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
503 | new_lwp->status_pending_p = 1; |
504 | new_lwp->status_pending = status; | |
da5898ce DJ |
505 | } |
506 | else | |
507 | /* Pass the signal on. This is what GDB does - except | |
508 | shouldn't we really report it instead? */ | |
e27d73f6 | 509 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 510 | } |
24a09b5f DJ |
511 | |
512 | /* Always resume the current thread. If we are stopping | |
513 | threads, it will have a pending SIGSTOP; we may as well | |
514 | collect it now. */ | |
2acc282a | 515 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
516 | } |
517 | } | |
518 | ||
d50171e4 PA |
519 | /* Return the PC as read from the regcache of LWP, without any |
520 | adjustment. */ | |
521 | ||
522 | static CORE_ADDR | |
523 | get_pc (struct lwp_info *lwp) | |
524 | { | |
525 | struct thread_info *saved_inferior; | |
526 | struct regcache *regcache; | |
527 | CORE_ADDR pc; | |
528 | ||
529 | if (the_low_target.get_pc == NULL) | |
530 | return 0; | |
531 | ||
532 | saved_inferior = current_inferior; | |
533 | current_inferior = get_lwp_thread (lwp); | |
534 | ||
535 | regcache = get_thread_regcache (current_inferior, 1); | |
536 | pc = (*the_low_target.get_pc) (regcache); | |
537 | ||
538 | if (debug_threads) | |
539 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
540 | ||
541 | current_inferior = saved_inferior; | |
542 | return pc; | |
543 | } | |
544 | ||
545 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
546 | The SIGTRAP could mean several things. |
547 | ||
548 | On i386, where decr_pc_after_break is non-zero: | |
549 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
550 | we will get only the one SIGTRAP (even if the instruction we | |
551 | stepped over was a breakpoint). The value of $eip will be the | |
552 | next instruction. | |
553 | If we continue the process using PTRACE_CONT, we will get a | |
554 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
555 | the instruction after the breakpoint (i.e. needs to be | |
556 | decremented). If we report the SIGTRAP to GDB, we must also | |
557 | report the undecremented PC. If we cancel the SIGTRAP, we | |
558 | must resume at the decremented PC. | |
559 | ||
560 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
561 | with hardware or kernel single-step: | |
562 | If we single-step over a breakpoint instruction, our PC will | |
563 | point at the following instruction. If we continue and hit a | |
564 | breakpoint instruction, our PC will point at the breakpoint | |
565 | instruction. */ | |
566 | ||
567 | static CORE_ADDR | |
d50171e4 | 568 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 569 | { |
d50171e4 PA |
570 | CORE_ADDR stop_pc; |
571 | ||
572 | if (the_low_target.get_pc == NULL) | |
573 | return 0; | |
0d62e5e8 | 574 | |
d50171e4 PA |
575 | stop_pc = get_pc (lwp); |
576 | ||
bdabb078 PA |
577 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
578 | && !lwp->stepping | |
579 | && !lwp->stopped_by_watchpoint | |
580 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
581 | stop_pc -= the_low_target.decr_pc_after_break; |
582 | ||
583 | if (debug_threads) | |
584 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
585 | ||
586 | return stop_pc; | |
0d62e5e8 | 587 | } |
ce3a066d | 588 | |
0d62e5e8 | 589 | static void * |
95954743 | 590 | add_lwp (ptid_t ptid) |
611cb4a5 | 591 | { |
54a0b537 | 592 | struct lwp_info *lwp; |
0d62e5e8 | 593 | |
54a0b537 PA |
594 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
595 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 596 | |
95954743 | 597 | lwp->head.id = ptid; |
0d62e5e8 | 598 | |
aa5ca48f DE |
599 | if (the_low_target.new_thread != NULL) |
600 | lwp->arch_private = the_low_target.new_thread (); | |
601 | ||
54a0b537 | 602 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 603 | |
54a0b537 | 604 | return lwp; |
0d62e5e8 | 605 | } |
611cb4a5 | 606 | |
da6d8c04 DJ |
607 | /* Start an inferior process and returns its pid. |
608 | ALLARGS is a vector of program-name and args. */ | |
609 | ||
ce3a066d DJ |
610 | static int |
611 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 612 | { |
03583c20 UW |
613 | #ifdef HAVE_PERSONALITY |
614 | int personality_orig = 0, personality_set = 0; | |
615 | #endif | |
a6dbe5df | 616 | struct lwp_info *new_lwp; |
da6d8c04 | 617 | int pid; |
95954743 | 618 | ptid_t ptid; |
da6d8c04 | 619 | |
03583c20 UW |
620 | #ifdef HAVE_PERSONALITY |
621 | if (disable_randomization) | |
622 | { | |
623 | errno = 0; | |
624 | personality_orig = personality (0xffffffff); | |
625 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
626 | { | |
627 | personality_set = 1; | |
628 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
629 | } | |
630 | if (errno != 0 || (personality_set | |
631 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
632 | warning ("Error disabling address space randomization: %s", | |
633 | strerror (errno)); | |
634 | } | |
635 | #endif | |
636 | ||
42c81e2a | 637 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
638 | pid = vfork (); |
639 | #else | |
da6d8c04 | 640 | pid = fork (); |
52fb6437 | 641 | #endif |
da6d8c04 DJ |
642 | if (pid < 0) |
643 | perror_with_name ("fork"); | |
644 | ||
645 | if (pid == 0) | |
646 | { | |
56f7af9c | 647 | ptrace (PTRACE_TRACEME, 0, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
da6d8c04 | 648 | |
1a981360 | 649 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 650 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 651 | #endif |
0d62e5e8 | 652 | |
a9fa9f7d DJ |
653 | setpgid (0, 0); |
654 | ||
e0f9f062 DE |
655 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
656 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
657 | Also, redirect stdin to /dev/null. */ | |
658 | if (remote_connection_is_stdio ()) | |
659 | { | |
660 | close (0); | |
661 | open ("/dev/null", O_RDONLY); | |
662 | dup2 (2, 1); | |
3e52c33d JK |
663 | if (write (2, "stdin/stdout redirected\n", |
664 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
665 | { |
666 | /* Errors ignored. */; | |
667 | } | |
e0f9f062 DE |
668 | } |
669 | ||
2b876972 DJ |
670 | execv (program, allargs); |
671 | if (errno == ENOENT) | |
672 | execvp (program, allargs); | |
da6d8c04 DJ |
673 | |
674 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 675 | strerror (errno)); |
da6d8c04 DJ |
676 | fflush (stderr); |
677 | _exit (0177); | |
678 | } | |
679 | ||
03583c20 UW |
680 | #ifdef HAVE_PERSONALITY |
681 | if (personality_set) | |
682 | { | |
683 | errno = 0; | |
684 | personality (personality_orig); | |
685 | if (errno != 0) | |
686 | warning ("Error restoring address space randomization: %s", | |
687 | strerror (errno)); | |
688 | } | |
689 | #endif | |
690 | ||
95954743 PA |
691 | linux_add_process (pid, 0); |
692 | ||
693 | ptid = ptid_build (pid, pid, 0); | |
694 | new_lwp = add_lwp (ptid); | |
695 | add_thread (ptid, new_lwp); | |
a6dbe5df | 696 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 697 | |
a9fa9f7d | 698 | return pid; |
da6d8c04 DJ |
699 | } |
700 | ||
701 | /* Attach to an inferior process. */ | |
702 | ||
95954743 PA |
703 | static void |
704 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 705 | { |
95954743 | 706 | ptid_t ptid; |
54a0b537 | 707 | struct lwp_info *new_lwp; |
611cb4a5 | 708 | |
56f7af9c MS |
709 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0) |
710 | != 0) | |
da6d8c04 | 711 | { |
87b0bb13 JK |
712 | struct buffer buffer; |
713 | ||
95954743 | 714 | if (!initial) |
2d717e4f DJ |
715 | { |
716 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 717 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
718 | strerror (errno), errno); |
719 | fflush (stderr); | |
720 | return; | |
721 | } | |
5f572dec JK |
722 | |
723 | /* If we fail to attach to a process, report an error. */ | |
87b0bb13 JK |
724 | buffer_init (&buffer); |
725 | linux_ptrace_attach_warnings (lwpid, &buffer); | |
726 | buffer_grow_str0 (&buffer, ""); | |
727 | error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer), | |
728 | lwpid, strerror (errno), errno); | |
da6d8c04 DJ |
729 | } |
730 | ||
95954743 | 731 | if (initial) |
e3deef73 LM |
732 | /* If lwp is the tgid, we handle adding existing threads later. |
733 | Otherwise we just add lwp without bothering about any other | |
734 | threads. */ | |
95954743 PA |
735 | ptid = ptid_build (lwpid, lwpid, 0); |
736 | else | |
737 | { | |
738 | /* Note that extracting the pid from the current inferior is | |
739 | safe, since we're always called in the context of the same | |
740 | process as this new thread. */ | |
741 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
742 | ptid = ptid_build (pid, lwpid, 0); | |
743 | } | |
24a09b5f | 744 | |
95954743 PA |
745 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
746 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 747 | |
a6dbe5df PA |
748 | /* We need to wait for SIGSTOP before being able to make the next |
749 | ptrace call on this LWP. */ | |
750 | new_lwp->must_set_ptrace_flags = 1; | |
751 | ||
644cebc9 | 752 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
753 | { |
754 | if (debug_threads) | |
755 | fprintf (stderr, | |
756 | "Attached to a stopped process\n"); | |
757 | ||
758 | /* The process is definitely stopped. It is in a job control | |
759 | stop, unless the kernel predates the TASK_STOPPED / | |
760 | TASK_TRACED distinction, in which case it might be in a | |
761 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
762 | can kill it, signal it, et cetera. | |
763 | ||
764 | First make sure there is a pending SIGSTOP. Since we are | |
765 | already attached, the process can not transition from stopped | |
766 | to running without a PTRACE_CONT; so we know this signal will | |
767 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
768 | probably already in the queue (unless this kernel is old | |
769 | enough to use TASK_STOPPED for ptrace stops); but since | |
770 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
771 | kill_lwp (lwpid, SIGSTOP); | |
772 | ||
773 | /* Finally, resume the stopped process. This will deliver the | |
774 | SIGSTOP (or a higher priority signal, just like normal | |
775 | PTRACE_ATTACH), which we'll catch later on. */ | |
56f7af9c | 776 | ptrace (PTRACE_CONT, lwpid, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
c14d7ab2 PA |
777 | } |
778 | ||
0d62e5e8 | 779 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
780 | brings it to a halt. |
781 | ||
782 | There are several cases to consider here: | |
783 | ||
784 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 785 | of a new thread that is being created. |
d50171e4 PA |
786 | In this case we should ignore that SIGSTOP and resume the |
787 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 788 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 789 | resume_continue. |
0e21c1ec DE |
790 | |
791 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
792 | to it via attach_inferior. |
793 | In this case we want the process thread to stop. | |
d50171e4 PA |
794 | This is handled by having linux_attach set last_resume_kind == |
795 | resume_stop after we return. | |
e3deef73 LM |
796 | |
797 | If the pid we are attaching to is also the tgid, we attach to and | |
798 | stop all the existing threads. Otherwise, we attach to pid and | |
799 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
800 | |
801 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
802 | existing threads. |
803 | In this case we want the thread to stop. | |
804 | FIXME: This case is currently not properly handled. | |
805 | We should wait for the SIGSTOP but don't. Things work apparently | |
806 | because enough time passes between when we ptrace (ATTACH) and when | |
807 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
808 | |
809 | On the other hand, if we are currently trying to stop all threads, we | |
810 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 811 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
812 | end of the list, and so the new thread has not yet reached |
813 | wait_for_sigstop (but will). */ | |
d50171e4 | 814 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
815 | } |
816 | ||
95954743 PA |
817 | void |
818 | linux_attach_lwp (unsigned long lwpid) | |
819 | { | |
820 | linux_attach_lwp_1 (lwpid, 0); | |
821 | } | |
822 | ||
e3deef73 LM |
823 | /* Attach to PID. If PID is the tgid, attach to it and all |
824 | of its threads. */ | |
825 | ||
c52daf70 | 826 | static int |
a1928bad | 827 | linux_attach (unsigned long pid) |
0d62e5e8 | 828 | { |
e3deef73 LM |
829 | /* Attach to PID. We will check for other threads |
830 | soon. */ | |
95954743 | 831 | linux_attach_lwp_1 (pid, 1); |
95954743 | 832 | linux_add_process (pid, 1); |
0d62e5e8 | 833 | |
bd99dc85 PA |
834 | if (!non_stop) |
835 | { | |
8336d594 PA |
836 | struct thread_info *thread; |
837 | ||
838 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
839 | process. It will be collected by wait shortly. */ | |
840 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
841 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 842 | } |
0d62e5e8 | 843 | |
e3deef73 LM |
844 | if (linux_proc_get_tgid (pid) == pid) |
845 | { | |
846 | DIR *dir; | |
847 | char pathname[128]; | |
848 | ||
849 | sprintf (pathname, "/proc/%ld/task", pid); | |
850 | ||
851 | dir = opendir (pathname); | |
852 | ||
853 | if (!dir) | |
854 | { | |
855 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
856 | fflush (stderr); | |
857 | } | |
858 | else | |
859 | { | |
860 | /* At this point we attached to the tgid. Scan the task for | |
861 | existing threads. */ | |
862 | unsigned long lwp; | |
863 | int new_threads_found; | |
864 | int iterations = 0; | |
865 | struct dirent *dp; | |
866 | ||
867 | while (iterations < 2) | |
868 | { | |
869 | new_threads_found = 0; | |
870 | /* Add all the other threads. While we go through the | |
871 | threads, new threads may be spawned. Cycle through | |
872 | the list of threads until we have done two iterations without | |
873 | finding new threads. */ | |
874 | while ((dp = readdir (dir)) != NULL) | |
875 | { | |
876 | /* Fetch one lwp. */ | |
877 | lwp = strtoul (dp->d_name, NULL, 10); | |
878 | ||
879 | /* Is this a new thread? */ | |
880 | if (lwp | |
881 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
882 | { | |
883 | linux_attach_lwp_1 (lwp, 0); | |
884 | new_threads_found++; | |
885 | ||
886 | if (debug_threads) | |
887 | fprintf (stderr, "\ | |
888 | Found and attached to new lwp %ld\n", lwp); | |
889 | } | |
890 | } | |
891 | ||
892 | if (!new_threads_found) | |
893 | iterations++; | |
894 | else | |
895 | iterations = 0; | |
896 | ||
897 | rewinddir (dir); | |
898 | } | |
899 | closedir (dir); | |
900 | } | |
901 | } | |
902 | ||
95954743 PA |
903 | return 0; |
904 | } | |
905 | ||
906 | struct counter | |
907 | { | |
908 | int pid; | |
909 | int count; | |
910 | }; | |
911 | ||
912 | static int | |
913 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
914 | { | |
915 | struct counter *counter = args; | |
916 | ||
917 | if (ptid_get_pid (entry->id) == counter->pid) | |
918 | { | |
919 | if (++counter->count > 1) | |
920 | return 1; | |
921 | } | |
d61ddec4 | 922 | |
da6d8c04 DJ |
923 | return 0; |
924 | } | |
925 | ||
95954743 PA |
926 | static int |
927 | last_thread_of_process_p (struct thread_info *thread) | |
928 | { | |
929 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
930 | int pid = ptid_get_pid (ptid); | |
931 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 932 | |
95954743 PA |
933 | return (find_inferior (&all_threads, |
934 | second_thread_of_pid_p, &counter) == NULL); | |
935 | } | |
936 | ||
da84f473 PA |
937 | /* Kill LWP. */ |
938 | ||
939 | static void | |
940 | linux_kill_one_lwp (struct lwp_info *lwp) | |
941 | { | |
942 | int pid = lwpid_of (lwp); | |
943 | ||
944 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
945 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
946 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
947 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
948 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
949 | per process, not one for each thread. But since we still support | |
950 | linuxthreads, and we also support debugging programs using raw | |
951 | clone without CLONE_THREAD, we send one for each thread. For | |
952 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
953 | about some old kernels where PTRACE_KILL might work better | |
954 | (dubious if there are any such, but that's why it's paranoia), so | |
955 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
956 | everywhere. */ | |
957 | ||
958 | errno = 0; | |
959 | kill (pid, SIGKILL); | |
960 | if (debug_threads) | |
961 | fprintf (stderr, | |
962 | "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
963 | target_pid_to_str (ptid_of (lwp)), | |
964 | errno ? strerror (errno) : "OK"); | |
965 | ||
966 | errno = 0; | |
56f7af9c | 967 | ptrace (PTRACE_KILL, pid, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
da84f473 PA |
968 | if (debug_threads) |
969 | fprintf (stderr, | |
970 | "LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
971 | target_pid_to_str (ptid_of (lwp)), | |
972 | errno ? strerror (errno) : "OK"); | |
973 | } | |
974 | ||
975 | /* Callback for `find_inferior'. Kills an lwp of a given process, | |
976 | except the leader. */ | |
95954743 PA |
977 | |
978 | static int | |
da84f473 | 979 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 980 | { |
0d62e5e8 | 981 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 982 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 983 | int wstat; |
95954743 PA |
984 | int pid = * (int *) args; |
985 | ||
986 | if (ptid_get_pid (entry->id) != pid) | |
987 | return 0; | |
0d62e5e8 | 988 | |
fd500816 DJ |
989 | /* We avoid killing the first thread here, because of a Linux kernel (at |
990 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
991 | the children get a chance to be reaped, it will remain a zombie | |
992 | forever. */ | |
95954743 | 993 | |
12b42a12 | 994 | if (lwpid_of (lwp) == pid) |
95954743 PA |
995 | { |
996 | if (debug_threads) | |
997 | fprintf (stderr, "lkop: is last of process %s\n", | |
998 | target_pid_to_str (entry->id)); | |
999 | return 0; | |
1000 | } | |
fd500816 | 1001 | |
0d62e5e8 DJ |
1002 | do |
1003 | { | |
da84f473 | 1004 | linux_kill_one_lwp (lwp); |
0d62e5e8 DJ |
1005 | |
1006 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 1007 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 1008 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
1009 | |
1010 | return 0; | |
da6d8c04 DJ |
1011 | } |
1012 | ||
95954743 PA |
1013 | static int |
1014 | linux_kill (int pid) | |
0d62e5e8 | 1015 | { |
95954743 | 1016 | struct process_info *process; |
54a0b537 | 1017 | struct lwp_info *lwp; |
fd500816 | 1018 | int wstat; |
95954743 | 1019 | int lwpid; |
fd500816 | 1020 | |
95954743 PA |
1021 | process = find_process_pid (pid); |
1022 | if (process == NULL) | |
1023 | return -1; | |
9d606399 | 1024 | |
f9e39928 PA |
1025 | /* If we're killing a running inferior, make sure it is stopped |
1026 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1027 | stop_all_lwps (0, NULL); |
f9e39928 | 1028 | |
da84f473 | 1029 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1030 | |
54a0b537 | 1031 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1032 | thread in the list, so do so now. */ |
95954743 | 1033 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1034 | |
784867a5 | 1035 | if (lwp == NULL) |
fd500816 | 1036 | { |
784867a5 JK |
1037 | if (debug_threads) |
1038 | fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n", | |
1039 | lwpid_of (lwp), pid); | |
1040 | } | |
1041 | else | |
1042 | { | |
1043 | if (debug_threads) | |
1044 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", | |
1045 | lwpid_of (lwp), pid); | |
fd500816 | 1046 | |
784867a5 JK |
1047 | do |
1048 | { | |
da84f473 | 1049 | linux_kill_one_lwp (lwp); |
784867a5 JK |
1050 | |
1051 | /* Make sure it died. The loop is most likely unnecessary. */ | |
1052 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); | |
1053 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
1054 | } | |
2d717e4f | 1055 | |
8336d594 | 1056 | the_target->mourn (process); |
f9e39928 PA |
1057 | |
1058 | /* Since we presently can only stop all lwps of all processes, we | |
1059 | need to unstop lwps of other processes. */ | |
7984d532 | 1060 | unstop_all_lwps (0, NULL); |
95954743 | 1061 | return 0; |
0d62e5e8 DJ |
1062 | } |
1063 | ||
9b224c5e PA |
1064 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1065 | signal the thread last stopped for, which we need to deliver to the | |
1066 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1067 | ||
1068 | static int | |
1069 | get_detach_signal (struct thread_info *thread) | |
1070 | { | |
a493e3e2 | 1071 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1072 | int status; |
1073 | struct lwp_info *lp = get_thread_lwp (thread); | |
1074 | ||
1075 | if (lp->status_pending_p) | |
1076 | status = lp->status_pending; | |
1077 | else | |
1078 | { | |
1079 | /* If the thread had been suspended by gdbserver, and it stopped | |
1080 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1081 | want to deliver that SIGSTOP. */ | |
1082 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1083 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1084 | return 0; |
1085 | ||
1086 | /* Otherwise, we may need to deliver the signal we | |
1087 | intercepted. */ | |
1088 | status = lp->last_status; | |
1089 | } | |
1090 | ||
1091 | if (!WIFSTOPPED (status)) | |
1092 | { | |
1093 | if (debug_threads) | |
1094 | fprintf (stderr, | |
1095 | "GPS: lwp %s hasn't stopped: no pending signal\n", | |
1096 | target_pid_to_str (ptid_of (lp))); | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
1101 | if (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1102 | { | |
1103 | if (debug_threads) | |
1104 | fprintf (stderr, | |
1105 | "GPS: lwp %s had stopped with extended " | |
1106 | "status: no pending signal\n", | |
1107 | target_pid_to_str (ptid_of (lp))); | |
1108 | return 0; | |
1109 | } | |
1110 | ||
2ea28649 | 1111 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1112 | |
1113 | if (program_signals_p && !program_signals[signo]) | |
1114 | { | |
1115 | if (debug_threads) | |
1116 | fprintf (stderr, | |
1117 | "GPS: lwp %s had signal %s, but it is in nopass state\n", | |
1118 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1119 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1120 | return 0; |
1121 | } | |
1122 | else if (!program_signals_p | |
1123 | /* If we have no way to know which signals GDB does not | |
1124 | want to have passed to the program, assume | |
1125 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1126 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1127 | { |
1128 | if (debug_threads) | |
1129 | fprintf (stderr, | |
1130 | "GPS: lwp %s had signal %s, " | |
1131 | "but we don't know if we should pass it. Default to not.\n", | |
1132 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1133 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1134 | return 0; |
1135 | } | |
1136 | else | |
1137 | { | |
1138 | if (debug_threads) | |
1139 | fprintf (stderr, | |
1140 | "GPS: lwp %s has pending signal %s: delivering it.\n", | |
1141 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1142 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1143 | |
1144 | return WSTOPSIG (status); | |
1145 | } | |
1146 | } | |
1147 | ||
95954743 PA |
1148 | static int |
1149 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1150 | { |
1151 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1152 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1153 | int pid = * (int *) args; |
9b224c5e | 1154 | int sig; |
95954743 PA |
1155 | |
1156 | if (ptid_get_pid (entry->id) != pid) | |
1157 | return 0; | |
6ad8ae5c | 1158 | |
9b224c5e | 1159 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1160 | if (lwp->stop_expected) |
ae13219e | 1161 | { |
9b224c5e PA |
1162 | if (debug_threads) |
1163 | fprintf (stderr, | |
1164 | "Sending SIGCONT to %s\n", | |
1165 | target_pid_to_str (ptid_of (lwp))); | |
1166 | ||
1167 | kill_lwp (lwpid_of (lwp), SIGCONT); | |
54a0b537 | 1168 | lwp->stop_expected = 0; |
ae13219e DJ |
1169 | } |
1170 | ||
1171 | /* Flush any pending changes to the process's registers. */ | |
1172 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 1173 | get_lwp_thread (lwp)); |
ae13219e | 1174 | |
9b224c5e PA |
1175 | /* Pass on any pending signal for this thread. */ |
1176 | sig = get_detach_signal (thread); | |
1177 | ||
ae13219e | 1178 | /* Finally, let it resume. */ |
82bfbe7e PA |
1179 | if (the_low_target.prepare_to_resume != NULL) |
1180 | the_low_target.prepare_to_resume (lwp); | |
56f7af9c | 1181 | if (ptrace (PTRACE_DETACH, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
f15f9948 | 1182 | (PTRACE_ARG4_TYPE) (long) sig) < 0) |
9b224c5e PA |
1183 | error (_("Can't detach %s: %s"), |
1184 | target_pid_to_str (ptid_of (lwp)), | |
1185 | strerror (errno)); | |
bd99dc85 PA |
1186 | |
1187 | delete_lwp (lwp); | |
95954743 | 1188 | return 0; |
6ad8ae5c DJ |
1189 | } |
1190 | ||
95954743 PA |
1191 | static int |
1192 | linux_detach (int pid) | |
1193 | { | |
1194 | struct process_info *process; | |
1195 | ||
1196 | process = find_process_pid (pid); | |
1197 | if (process == NULL) | |
1198 | return -1; | |
1199 | ||
f9e39928 PA |
1200 | /* Stop all threads before detaching. First, ptrace requires that |
1201 | the thread is stopped to sucessfully detach. Second, thread_db | |
1202 | may need to uninstall thread event breakpoints from memory, which | |
1203 | only works with a stopped process anyway. */ | |
7984d532 | 1204 | stop_all_lwps (0, NULL); |
f9e39928 | 1205 | |
ca5c370d | 1206 | #ifdef USE_THREAD_DB |
8336d594 | 1207 | thread_db_detach (process); |
ca5c370d PA |
1208 | #endif |
1209 | ||
fa593d66 PA |
1210 | /* Stabilize threads (move out of jump pads). */ |
1211 | stabilize_threads (); | |
1212 | ||
95954743 | 1213 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1214 | |
1215 | the_target->mourn (process); | |
f9e39928 PA |
1216 | |
1217 | /* Since we presently can only stop all lwps of all processes, we | |
1218 | need to unstop lwps of other processes. */ | |
7984d532 | 1219 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1220 | return 0; |
1221 | } | |
1222 | ||
1223 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1224 | ||
1225 | static int | |
1226 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1227 | { | |
1228 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1229 | struct process_info *process = proc; | |
1230 | ||
1231 | if (pid_of (lwp) == pid_of (process)) | |
1232 | delete_lwp (lwp); | |
1233 | ||
dd6953e1 | 1234 | return 0; |
6ad8ae5c DJ |
1235 | } |
1236 | ||
8336d594 PA |
1237 | static void |
1238 | linux_mourn (struct process_info *process) | |
1239 | { | |
1240 | struct process_info_private *priv; | |
1241 | ||
1242 | #ifdef USE_THREAD_DB | |
1243 | thread_db_mourn (process); | |
1244 | #endif | |
1245 | ||
f9e39928 PA |
1246 | find_inferior (&all_lwps, delete_lwp_callback, process); |
1247 | ||
8336d594 PA |
1248 | /* Freeing all private data. */ |
1249 | priv = process->private; | |
1250 | free (priv->arch_private); | |
1251 | free (priv); | |
1252 | process->private = NULL; | |
505106cd PA |
1253 | |
1254 | remove_process (process); | |
8336d594 PA |
1255 | } |
1256 | ||
444d6139 | 1257 | static void |
95954743 | 1258 | linux_join (int pid) |
444d6139 | 1259 | { |
444d6139 PA |
1260 | int status, ret; |
1261 | ||
1262 | do { | |
95954743 | 1263 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1264 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1265 | break; | |
1266 | } while (ret != -1 || errno != ECHILD); | |
1267 | } | |
1268 | ||
6ad8ae5c | 1269 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1270 | static int |
95954743 | 1271 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1272 | { |
95954743 PA |
1273 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1274 | ||
1275 | /* We assume we always know if a thread exits. If a whole process | |
1276 | exited but we still haven't been able to report it to GDB, we'll | |
1277 | hold on to the last lwp of the dead process. */ | |
1278 | if (lwp != NULL) | |
1279 | return !lwp->dead; | |
0d62e5e8 DJ |
1280 | else |
1281 | return 0; | |
1282 | } | |
1283 | ||
6bf5e0ba | 1284 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1285 | static int |
d50171e4 | 1286 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1287 | { |
54a0b537 | 1288 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1289 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1290 | struct thread_info *thread; |
95954743 PA |
1291 | |
1292 | /* Check if we're only interested in events from a specific process | |
1293 | or its lwps. */ | |
1294 | if (!ptid_equal (minus_one_ptid, ptid) | |
1295 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
1296 | return 0; | |
0d62e5e8 | 1297 | |
d50171e4 PA |
1298 | thread = get_lwp_thread (lwp); |
1299 | ||
1300 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1301 | report any status pending the LWP may have. */ | |
8336d594 | 1302 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1303 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1304 | return 0; |
0d62e5e8 | 1305 | |
d50171e4 | 1306 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1307 | } |
1308 | ||
95954743 PA |
1309 | static int |
1310 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1311 | { | |
1312 | ptid_t ptid = *(ptid_t *) data; | |
1313 | int lwp; | |
1314 | ||
1315 | if (ptid_get_lwp (ptid) != 0) | |
1316 | lwp = ptid_get_lwp (ptid); | |
1317 | else | |
1318 | lwp = ptid_get_pid (ptid); | |
1319 | ||
1320 | if (ptid_get_lwp (entry->id) == lwp) | |
1321 | return 1; | |
1322 | ||
1323 | return 0; | |
1324 | } | |
1325 | ||
1326 | struct lwp_info * | |
1327 | find_lwp_pid (ptid_t ptid) | |
1328 | { | |
1329 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1330 | } | |
1331 | ||
bd99dc85 | 1332 | static struct lwp_info * |
95954743 | 1333 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1334 | { |
0d62e5e8 | 1335 | int ret; |
95954743 | 1336 | int to_wait_for = -1; |
bd99dc85 | 1337 | struct lwp_info *child = NULL; |
0d62e5e8 | 1338 | |
bd99dc85 | 1339 | if (debug_threads) |
95954743 PA |
1340 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1341 | ||
1342 | if (ptid_equal (ptid, minus_one_ptid)) | |
1343 | to_wait_for = -1; /* any child */ | |
1344 | else | |
1345 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1346 | |
bd99dc85 | 1347 | options |= __WALL; |
0d62e5e8 | 1348 | |
bd99dc85 | 1349 | retry: |
0d62e5e8 | 1350 | |
bd99dc85 PA |
1351 | ret = my_waitpid (to_wait_for, wstatp, options); |
1352 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1353 | return NULL; | |
1354 | else if (ret == -1) | |
1355 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1356 | |
1357 | if (debug_threads | |
1358 | && (!WIFSTOPPED (*wstatp) | |
1359 | || (WSTOPSIG (*wstatp) != 32 | |
1360 | && WSTOPSIG (*wstatp) != 33))) | |
1361 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1362 | ||
95954743 | 1363 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1364 | |
24a09b5f DJ |
1365 | /* If we didn't find a process, one of two things presumably happened: |
1366 | - A process we started and then detached from has exited. Ignore it. | |
1367 | - A process we are controlling has forked and the new child's stop | |
1368 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1369 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f | 1370 | { |
05044653 | 1371 | add_to_pid_list (&stopped_pids, ret, *wstatp); |
24a09b5f DJ |
1372 | goto retry; |
1373 | } | |
bd99dc85 | 1374 | else if (child == NULL) |
24a09b5f DJ |
1375 | goto retry; |
1376 | ||
bd99dc85 | 1377 | child->stopped = 1; |
0d62e5e8 | 1378 | |
bd99dc85 | 1379 | child->last_status = *wstatp; |
32ca6d61 | 1380 | |
d61ddec4 UW |
1381 | /* Architecture-specific setup after inferior is running. |
1382 | This needs to happen after we have attached to the inferior | |
1383 | and it is stopped for the first time, but before we access | |
1384 | any inferior registers. */ | |
1385 | if (new_inferior) | |
1386 | { | |
1387 | the_low_target.arch_setup (); | |
52fa2412 UW |
1388 | #ifdef HAVE_LINUX_REGSETS |
1389 | memset (disabled_regsets, 0, num_regsets); | |
1390 | #endif | |
d61ddec4 UW |
1391 | new_inferior = 0; |
1392 | } | |
1393 | ||
c3adc08c PA |
1394 | /* Fetch the possibly triggered data watchpoint info and store it in |
1395 | CHILD. | |
1396 | ||
1397 | On some archs, like x86, that use debug registers to set | |
1398 | watchpoints, it's possible that the way to know which watched | |
1399 | address trapped, is to check the register that is used to select | |
1400 | which address to watch. Problem is, between setting the | |
1401 | watchpoint and reading back which data address trapped, the user | |
1402 | may change the set of watchpoints, and, as a consequence, GDB | |
1403 | changes the debug registers in the inferior. To avoid reading | |
1404 | back a stale stopped-data-address when that happens, we cache in | |
1405 | LP the fact that a watchpoint trapped, and the corresponding data | |
1406 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1407 | changes the debug registers meanwhile, we have the cached data we | |
1408 | can rely on. */ | |
1409 | ||
1410 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1411 | { | |
1412 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1413 | { | |
1414 | child->stopped_by_watchpoint = 0; | |
1415 | } | |
1416 | else | |
1417 | { | |
1418 | struct thread_info *saved_inferior; | |
1419 | ||
1420 | saved_inferior = current_inferior; | |
1421 | current_inferior = get_lwp_thread (child); | |
1422 | ||
1423 | child->stopped_by_watchpoint | |
1424 | = the_low_target.stopped_by_watchpoint (); | |
1425 | ||
1426 | if (child->stopped_by_watchpoint) | |
1427 | { | |
1428 | if (the_low_target.stopped_data_address != NULL) | |
1429 | child->stopped_data_address | |
1430 | = the_low_target.stopped_data_address (); | |
1431 | else | |
1432 | child->stopped_data_address = 0; | |
1433 | } | |
1434 | ||
1435 | current_inferior = saved_inferior; | |
1436 | } | |
1437 | } | |
1438 | ||
d50171e4 PA |
1439 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1440 | architecture being defined already (so that CHILD has a valid | |
1441 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1442 | not). */ | |
1443 | if (WIFSTOPPED (*wstatp)) | |
1444 | child->stop_pc = get_stop_pc (child); | |
1445 | ||
0d62e5e8 | 1446 | if (debug_threads |
47c0c975 DE |
1447 | && WIFSTOPPED (*wstatp) |
1448 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1449 | { |
896c7fbb | 1450 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1451 | struct regcache *regcache; |
47c0c975 DE |
1452 | CORE_ADDR pc; |
1453 | ||
d50171e4 | 1454 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1455 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1456 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1457 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1458 | current_inferior = saved_inferior; |
0d62e5e8 | 1459 | } |
bd99dc85 PA |
1460 | |
1461 | return child; | |
0d62e5e8 | 1462 | } |
611cb4a5 | 1463 | |
219f2f23 PA |
1464 | /* This function should only be called if the LWP got a SIGTRAP. |
1465 | ||
1466 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1467 | event was handled, 0 otherwise. */ | |
1468 | ||
1469 | static int | |
1470 | handle_tracepoints (struct lwp_info *lwp) | |
1471 | { | |
1472 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1473 | int tpoint_related_event = 0; | |
1474 | ||
7984d532 PA |
1475 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1476 | uninsert tracepoints. To do this, we temporarily pause all | |
1477 | threads, unpatch away, and then unpause threads. We need to make | |
1478 | sure the unpausing doesn't resume LWP too. */ | |
1479 | lwp->suspended++; | |
1480 | ||
219f2f23 PA |
1481 | /* And we need to be sure that any all-threads-stopping doesn't try |
1482 | to move threads out of the jump pads, as it could deadlock the | |
1483 | inferior (LWP could be in the jump pad, maybe even holding the | |
1484 | lock.) */ | |
1485 | ||
1486 | /* Do any necessary step collect actions. */ | |
1487 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1488 | ||
fa593d66 PA |
1489 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1490 | ||
219f2f23 PA |
1491 | /* See if we just hit a tracepoint and do its main collect |
1492 | actions. */ | |
1493 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1494 | ||
7984d532 PA |
1495 | lwp->suspended--; |
1496 | ||
1497 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1498 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1499 | |
219f2f23 PA |
1500 | if (tpoint_related_event) |
1501 | { | |
1502 | if (debug_threads) | |
1503 | fprintf (stderr, "got a tracepoint event\n"); | |
1504 | return 1; | |
1505 | } | |
1506 | ||
1507 | return 0; | |
1508 | } | |
1509 | ||
fa593d66 PA |
1510 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1511 | fast tracepoint. */ | |
1512 | ||
1513 | static int | |
1514 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1515 | struct fast_tpoint_collect_status *status) | |
1516 | { | |
1517 | CORE_ADDR thread_area; | |
1518 | ||
1519 | if (the_low_target.get_thread_area == NULL) | |
1520 | return 0; | |
1521 | ||
1522 | /* Get the thread area address. This is used to recognize which | |
1523 | thread is which when tracing with the in-process agent library. | |
1524 | We don't read anything from the address, and treat it as opaque; | |
1525 | it's the address itself that we assume is unique per-thread. */ | |
1526 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1527 | return 0; | |
1528 | ||
1529 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1530 | } | |
1531 | ||
1532 | /* The reason we resume in the caller, is because we want to be able | |
1533 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1534 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1535 | refuses to resume. */ | |
1536 | ||
1537 | static int | |
1538 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1539 | { | |
1540 | struct thread_info *saved_inferior; | |
1541 | ||
1542 | saved_inferior = current_inferior; | |
1543 | current_inferior = get_lwp_thread (lwp); | |
1544 | ||
1545 | if ((wstat == NULL | |
1546 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1547 | && supports_fast_tracepoints () | |
58b4daa5 | 1548 | && agent_loaded_p ()) |
fa593d66 PA |
1549 | { |
1550 | struct fast_tpoint_collect_status status; | |
1551 | int r; | |
1552 | ||
1553 | if (debug_threads) | |
1554 | fprintf (stderr, "\ | |
1555 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1556 | lwpid_of (lwp)); | |
1557 | ||
1558 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1559 | ||
1560 | if (wstat == NULL | |
1561 | || (WSTOPSIG (*wstat) != SIGILL | |
1562 | && WSTOPSIG (*wstat) != SIGFPE | |
1563 | && WSTOPSIG (*wstat) != SIGSEGV | |
1564 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1565 | { | |
1566 | lwp->collecting_fast_tracepoint = r; | |
1567 | ||
1568 | if (r != 0) | |
1569 | { | |
1570 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1571 | { | |
1572 | /* Haven't executed the original instruction yet. | |
1573 | Set breakpoint there, and wait till it's hit, | |
1574 | then single-step until exiting the jump pad. */ | |
1575 | lwp->exit_jump_pad_bkpt | |
1576 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1577 | } | |
1578 | ||
1579 | if (debug_threads) | |
1580 | fprintf (stderr, "\ | |
1581 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1582 | lwpid_of (lwp)); | |
0cccb683 | 1583 | current_inferior = saved_inferior; |
fa593d66 PA |
1584 | |
1585 | return 1; | |
1586 | } | |
1587 | } | |
1588 | else | |
1589 | { | |
1590 | /* If we get a synchronous signal while collecting, *and* | |
1591 | while executing the (relocated) original instruction, | |
1592 | reset the PC to point at the tpoint address, before | |
1593 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1594 | report the signal to GDB, and pray for the best. */ | |
1595 | ||
1596 | lwp->collecting_fast_tracepoint = 0; | |
1597 | ||
1598 | if (r != 0 | |
1599 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1600 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1601 | { | |
1602 | siginfo_t info; | |
1603 | struct regcache *regcache; | |
1604 | ||
1605 | /* The si_addr on a few signals references the address | |
1606 | of the faulting instruction. Adjust that as | |
1607 | well. */ | |
1608 | if ((WSTOPSIG (*wstat) == SIGILL | |
1609 | || WSTOPSIG (*wstat) == SIGFPE | |
1610 | || WSTOPSIG (*wstat) == SIGBUS | |
1611 | || WSTOPSIG (*wstat) == SIGSEGV) | |
56f7af9c MS |
1612 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), |
1613 | (PTRACE_ARG3_TYPE) 0, &info) == 0 | |
fa593d66 PA |
1614 | /* Final check just to make sure we don't clobber |
1615 | the siginfo of non-kernel-sent signals. */ | |
1616 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1617 | { | |
1618 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
56f7af9c MS |
1619 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), |
1620 | (PTRACE_ARG3_TYPE) 0, &info); | |
fa593d66 PA |
1621 | } |
1622 | ||
1623 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1624 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1625 | lwp->stop_pc = status.tpoint_addr; | |
1626 | ||
1627 | /* Cancel any fast tracepoint lock this thread was | |
1628 | holding. */ | |
1629 | force_unlock_trace_buffer (); | |
1630 | } | |
1631 | ||
1632 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1633 | { | |
1634 | if (debug_threads) | |
1635 | fprintf (stderr, | |
1636 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1637 | "stopping all threads momentarily.\n"); | |
1638 | ||
1639 | stop_all_lwps (1, lwp); | |
1640 | cancel_breakpoints (); | |
1641 | ||
1642 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1643 | lwp->exit_jump_pad_bkpt = NULL; | |
1644 | ||
1645 | unstop_all_lwps (1, lwp); | |
1646 | ||
1647 | gdb_assert (lwp->suspended >= 0); | |
1648 | } | |
1649 | } | |
1650 | } | |
1651 | ||
1652 | if (debug_threads) | |
1653 | fprintf (stderr, "\ | |
1654 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1655 | lwpid_of (lwp)); | |
0cccb683 YQ |
1656 | |
1657 | current_inferior = saved_inferior; | |
fa593d66 PA |
1658 | return 0; |
1659 | } | |
1660 | ||
1661 | /* Enqueue one signal in the "signals to report later when out of the | |
1662 | jump pad" list. */ | |
1663 | ||
1664 | static void | |
1665 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1666 | { | |
1667 | struct pending_signals *p_sig; | |
1668 | ||
1669 | if (debug_threads) | |
1670 | fprintf (stderr, "\ | |
1671 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1672 | ||
1673 | if (debug_threads) | |
1674 | { | |
1675 | struct pending_signals *sig; | |
1676 | ||
1677 | for (sig = lwp->pending_signals_to_report; | |
1678 | sig != NULL; | |
1679 | sig = sig->prev) | |
1680 | fprintf (stderr, | |
1681 | " Already queued %d\n", | |
1682 | sig->signal); | |
1683 | ||
1684 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1685 | } | |
1686 | ||
1a981360 PA |
1687 | /* Don't enqueue non-RT signals if they are already in the deferred |
1688 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1689 | twice) */ | |
1690 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1691 | { | |
1692 | struct pending_signals *sig; | |
1693 | ||
1694 | for (sig = lwp->pending_signals_to_report; | |
1695 | sig != NULL; | |
1696 | sig = sig->prev) | |
1697 | { | |
1698 | if (sig->signal == WSTOPSIG (*wstat)) | |
1699 | { | |
1700 | if (debug_threads) | |
1701 | fprintf (stderr, | |
1702 | "Not requeuing already queued non-RT signal %d" | |
1703 | " for LWP %ld\n", | |
1704 | sig->signal, | |
1705 | lwpid_of (lwp)); | |
1706 | return; | |
1707 | } | |
1708 | } | |
1709 | } | |
1710 | ||
fa593d66 PA |
1711 | p_sig = xmalloc (sizeof (*p_sig)); |
1712 | p_sig->prev = lwp->pending_signals_to_report; | |
1713 | p_sig->signal = WSTOPSIG (*wstat); | |
1714 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
56f7af9c MS |
1715 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
1716 | &p_sig->info); | |
fa593d66 PA |
1717 | |
1718 | lwp->pending_signals_to_report = p_sig; | |
1719 | } | |
1720 | ||
1721 | /* Dequeue one signal from the "signals to report later when out of | |
1722 | the jump pad" list. */ | |
1723 | ||
1724 | static int | |
1725 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1726 | { | |
1727 | if (lwp->pending_signals_to_report != NULL) | |
1728 | { | |
1729 | struct pending_signals **p_sig; | |
1730 | ||
1731 | p_sig = &lwp->pending_signals_to_report; | |
1732 | while ((*p_sig)->prev != NULL) | |
1733 | p_sig = &(*p_sig)->prev; | |
1734 | ||
1735 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1736 | if ((*p_sig)->info.si_signo != 0) | |
56f7af9c MS |
1737 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
1738 | &(*p_sig)->info); | |
fa593d66 PA |
1739 | free (*p_sig); |
1740 | *p_sig = NULL; | |
1741 | ||
1742 | if (debug_threads) | |
1743 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1744 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1745 | ||
1746 | if (debug_threads) | |
1747 | { | |
1748 | struct pending_signals *sig; | |
1749 | ||
1750 | for (sig = lwp->pending_signals_to_report; | |
1751 | sig != NULL; | |
1752 | sig = sig->prev) | |
1753 | fprintf (stderr, | |
1754 | " Still queued %d\n", | |
1755 | sig->signal); | |
1756 | ||
1757 | fprintf (stderr, " (no more queued signals)\n"); | |
1758 | } | |
1759 | ||
1760 | return 1; | |
1761 | } | |
1762 | ||
1763 | return 0; | |
1764 | } | |
1765 | ||
d50171e4 PA |
1766 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1767 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1768 | will handle the current event, eventually we will resume this LWP, | |
1769 | and this breakpoint will trap again. */ | |
1770 | ||
1771 | static int | |
1772 | cancel_breakpoint (struct lwp_info *lwp) | |
1773 | { | |
1774 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1775 | |
1776 | /* There's nothing to do if we don't support breakpoints. */ | |
1777 | if (!supports_breakpoints ()) | |
1778 | return 0; | |
1779 | ||
d50171e4 PA |
1780 | /* breakpoint_at reads from current inferior. */ |
1781 | saved_inferior = current_inferior; | |
1782 | current_inferior = get_lwp_thread (lwp); | |
1783 | ||
1784 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1785 | { | |
1786 | if (debug_threads) | |
1787 | fprintf (stderr, | |
1788 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1789 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1790 | |
1791 | /* Back up the PC if necessary. */ | |
1792 | if (the_low_target.decr_pc_after_break) | |
1793 | { | |
1794 | struct regcache *regcache | |
fc7238bb | 1795 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1796 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1797 | } | |
1798 | ||
1799 | current_inferior = saved_inferior; | |
1800 | return 1; | |
1801 | } | |
1802 | else | |
1803 | { | |
1804 | if (debug_threads) | |
1805 | fprintf (stderr, | |
1806 | "CB: No breakpoint found at %s for [%s]\n", | |
1807 | paddress (lwp->stop_pc), | |
fc7238bb | 1808 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1809 | } |
1810 | ||
1811 | current_inferior = saved_inferior; | |
1812 | return 0; | |
1813 | } | |
1814 | ||
1815 | /* When the event-loop is doing a step-over, this points at the thread | |
1816 | being stepped. */ | |
1817 | ptid_t step_over_bkpt; | |
1818 | ||
bd99dc85 PA |
1819 | /* Wait for an event from child PID. If PID is -1, wait for any |
1820 | child. Store the stop status through the status pointer WSTAT. | |
1821 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1822 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1823 | the stopped child otherwise. */ | |
1824 | ||
0d62e5e8 | 1825 | static int |
d8301ad1 | 1826 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1827 | { |
d50171e4 | 1828 | struct lwp_info *event_child, *requested_child; |
d8301ad1 | 1829 | ptid_t wait_ptid; |
d50171e4 | 1830 | |
d50171e4 PA |
1831 | event_child = NULL; |
1832 | requested_child = NULL; | |
0d62e5e8 | 1833 | |
95954743 | 1834 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1835 | |
e825046f | 1836 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
0d62e5e8 | 1837 | { |
54a0b537 | 1838 | event_child = (struct lwp_info *) |
d50171e4 | 1839 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1840 | if (debug_threads && event_child) |
bd99dc85 | 1841 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1842 | } |
1843 | else | |
1844 | { | |
95954743 | 1845 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1846 | |
bde24c0a | 1847 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
1848 | && requested_child->status_pending_p |
1849 | && requested_child->collecting_fast_tracepoint) | |
1850 | { | |
1851 | enqueue_one_deferred_signal (requested_child, | |
1852 | &requested_child->status_pending); | |
1853 | requested_child->status_pending_p = 0; | |
1854 | requested_child->status_pending = 0; | |
1855 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1856 | } | |
1857 | ||
1858 | if (requested_child->suspended | |
1859 | && requested_child->status_pending_p) | |
1860 | fatal ("requesting an event out of a suspended child?"); | |
1861 | ||
d50171e4 | 1862 | if (requested_child->status_pending_p) |
bd99dc85 | 1863 | event_child = requested_child; |
0d62e5e8 | 1864 | } |
611cb4a5 | 1865 | |
0d62e5e8 DJ |
1866 | if (event_child != NULL) |
1867 | { | |
bd99dc85 PA |
1868 | if (debug_threads) |
1869 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1870 | lwpid_of (event_child), event_child->status_pending); | |
1871 | *wstat = event_child->status_pending; | |
1872 | event_child->status_pending_p = 0; | |
1873 | event_child->status_pending = 0; | |
1874 | current_inferior = get_lwp_thread (event_child); | |
1875 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1876 | } |
1877 | ||
d8301ad1 JK |
1878 | if (ptid_is_pid (ptid)) |
1879 | { | |
1880 | /* A request to wait for a specific tgid. This is not possible | |
1881 | with waitpid, so instead, we wait for any child, and leave | |
1882 | children we're not interested in right now with a pending | |
1883 | status to report later. */ | |
1884 | wait_ptid = minus_one_ptid; | |
1885 | } | |
1886 | else | |
1887 | wait_ptid = ptid; | |
1888 | ||
0d62e5e8 DJ |
1889 | /* We only enter this loop if no process has a pending wait status. Thus |
1890 | any action taken in response to a wait status inside this loop is | |
1891 | responding as soon as we detect the status, not after any pending | |
1892 | events. */ | |
1893 | while (1) | |
1894 | { | |
d8301ad1 | 1895 | event_child = linux_wait_for_lwp (wait_ptid, wstat, options); |
0d62e5e8 | 1896 | |
bd99dc85 | 1897 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1898 | { |
1899 | if (debug_threads) | |
1900 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1901 | return 0; | |
1902 | } | |
0d62e5e8 DJ |
1903 | |
1904 | if (event_child == NULL) | |
1905 | error ("event from unknown child"); | |
611cb4a5 | 1906 | |
d8301ad1 JK |
1907 | if (ptid_is_pid (ptid) |
1908 | && ptid_get_pid (ptid) != ptid_get_pid (ptid_of (event_child))) | |
1909 | { | |
1910 | if (! WIFSTOPPED (*wstat)) | |
1911 | mark_lwp_dead (event_child, *wstat); | |
1912 | else | |
1913 | { | |
1914 | event_child->status_pending_p = 1; | |
1915 | event_child->status_pending = *wstat; | |
1916 | } | |
1917 | continue; | |
1918 | } | |
1919 | ||
bd99dc85 | 1920 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1921 | |
89be2091 | 1922 | /* Check for thread exit. */ |
bd99dc85 | 1923 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1924 | { |
89be2091 | 1925 | if (debug_threads) |
95954743 | 1926 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1927 | |
1928 | /* If the last thread is exiting, just return. */ | |
95954743 | 1929 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1930 | { |
1931 | if (debug_threads) | |
95954743 PA |
1932 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1933 | lwpid_of (event_child)); | |
bd99dc85 PA |
1934 | return lwpid_of (event_child); |
1935 | } | |
89be2091 | 1936 | |
bd99dc85 PA |
1937 | if (!non_stop) |
1938 | { | |
1939 | current_inferior = (struct thread_info *) all_threads.head; | |
1940 | if (debug_threads) | |
1941 | fprintf (stderr, "Current inferior is now %ld\n", | |
1942 | lwpid_of (get_thread_lwp (current_inferior))); | |
1943 | } | |
1944 | else | |
1945 | { | |
1946 | current_inferior = NULL; | |
1947 | if (debug_threads) | |
1948 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1949 | } | |
89be2091 DJ |
1950 | |
1951 | /* If we were waiting for this particular child to do something... | |
1952 | well, it did something. */ | |
bd99dc85 | 1953 | if (requested_child != NULL) |
d50171e4 PA |
1954 | { |
1955 | int lwpid = lwpid_of (event_child); | |
1956 | ||
1957 | /* Cancel the step-over operation --- the thread that | |
1958 | started it is gone. */ | |
1959 | if (finish_step_over (event_child)) | |
7984d532 | 1960 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1961 | delete_lwp (event_child); |
1962 | return lwpid; | |
1963 | } | |
1964 | ||
1965 | delete_lwp (event_child); | |
89be2091 DJ |
1966 | |
1967 | /* Wait for a more interesting event. */ | |
1968 | continue; | |
1969 | } | |
1970 | ||
a6dbe5df PA |
1971 | if (event_child->must_set_ptrace_flags) |
1972 | { | |
1e7fc18c | 1973 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1974 | event_child->must_set_ptrace_flags = 0; |
1975 | } | |
1976 | ||
bd99dc85 PA |
1977 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1978 | && *wstat >> 16 != 0) | |
24a09b5f | 1979 | { |
bd99dc85 | 1980 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1981 | continue; |
1982 | } | |
1983 | ||
d50171e4 PA |
1984 | if (WIFSTOPPED (*wstat) |
1985 | && WSTOPSIG (*wstat) == SIGSTOP | |
1986 | && event_child->stop_expected) | |
1987 | { | |
1988 | int should_stop; | |
1989 | ||
1990 | if (debug_threads) | |
1991 | fprintf (stderr, "Expected stop.\n"); | |
1992 | event_child->stop_expected = 0; | |
1993 | ||
8336d594 | 1994 | should_stop = (current_inferior->last_resume_kind == resume_stop |
bde24c0a | 1995 | || stopping_threads != NOT_STOPPING_THREADS); |
d50171e4 PA |
1996 | |
1997 | if (!should_stop) | |
1998 | { | |
1999 | linux_resume_one_lwp (event_child, | |
2000 | event_child->stepping, 0, NULL); | |
2001 | continue; | |
2002 | } | |
2003 | } | |
2004 | ||
bd99dc85 | 2005 | return lwpid_of (event_child); |
611cb4a5 | 2006 | } |
0d62e5e8 | 2007 | |
611cb4a5 DJ |
2008 | /* NOTREACHED */ |
2009 | return 0; | |
2010 | } | |
2011 | ||
6bf5e0ba PA |
2012 | /* Count the LWP's that have had events. */ |
2013 | ||
2014 | static int | |
2015 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2016 | { | |
2017 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2018 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2019 | int *count = data; |
2020 | ||
2021 | gdb_assert (count != NULL); | |
2022 | ||
2023 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
2024 | should be reported to GDB. */ | |
8336d594 PA |
2025 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2026 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
2027 | && lp->status_pending_p |
2028 | && WIFSTOPPED (lp->status_pending) | |
2029 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2030 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2031 | (*count)++; | |
2032 | ||
2033 | return 0; | |
2034 | } | |
2035 | ||
2036 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2037 | ||
2038 | static int | |
2039 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2040 | { | |
2041 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2042 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 2043 | |
8336d594 PA |
2044 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2045 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2046 | && lp->status_pending_p) |
2047 | return 1; | |
2048 | else | |
2049 | return 0; | |
2050 | } | |
2051 | ||
2052 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2053 | reported to GDB. */ | |
2054 | ||
2055 | static int | |
2056 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2057 | { | |
2058 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2059 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2060 | int *selector = data; |
2061 | ||
2062 | gdb_assert (selector != NULL); | |
2063 | ||
2064 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
2065 | if (thread->last_resume_kind != resume_stop |
2066 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2067 | && lp->status_pending_p |
2068 | && WIFSTOPPED (lp->status_pending) | |
2069 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2070 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2071 | if ((*selector)-- == 0) | |
2072 | return 1; | |
2073 | ||
2074 | return 0; | |
2075 | } | |
2076 | ||
2077 | static int | |
2078 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
2079 | { | |
2080 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2081 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2082 | struct lwp_info *event_lp = data; |
2083 | ||
2084 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2085 | if (lp == event_lp) | |
2086 | return 0; | |
2087 | ||
2088 | /* If a LWP other than the LWP that we're reporting an event for has | |
2089 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2090 | then just arrange for it to hit it again later. We don't keep | |
2091 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2092 | LWP. We will handle the current event, eventually we will resume | |
2093 | all LWPs, and this one will get its breakpoint trap again. | |
2094 | ||
2095 | If we do not do this, then we run the risk that the user will | |
2096 | delete or disable the breakpoint, but the LWP will have already | |
2097 | tripped on it. */ | |
2098 | ||
8336d594 PA |
2099 | if (thread->last_resume_kind != resume_stop |
2100 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2101 | && lp->status_pending_p |
2102 | && WIFSTOPPED (lp->status_pending) | |
2103 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
2104 | && !lp->stepping |
2105 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
2106 | && cancel_breakpoint (lp)) |
2107 | /* Throw away the SIGTRAP. */ | |
2108 | lp->status_pending_p = 0; | |
2109 | ||
2110 | return 0; | |
2111 | } | |
2112 | ||
7984d532 PA |
2113 | static void |
2114 | linux_cancel_breakpoints (void) | |
2115 | { | |
2116 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
2117 | } | |
2118 | ||
6bf5e0ba PA |
2119 | /* Select one LWP out of those that have events pending. */ |
2120 | ||
2121 | static void | |
2122 | select_event_lwp (struct lwp_info **orig_lp) | |
2123 | { | |
2124 | int num_events = 0; | |
2125 | int random_selector; | |
2126 | struct lwp_info *event_lp; | |
2127 | ||
2128 | /* Give preference to any LWP that is being single-stepped. */ | |
2129 | event_lp | |
2130 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2131 | select_singlestep_lwp_callback, NULL); | |
2132 | if (event_lp != NULL) | |
2133 | { | |
2134 | if (debug_threads) | |
2135 | fprintf (stderr, | |
2136 | "SEL: Select single-step %s\n", | |
2137 | target_pid_to_str (ptid_of (event_lp))); | |
2138 | } | |
2139 | else | |
2140 | { | |
2141 | /* No single-stepping LWP. Select one at random, out of those | |
2142 | which have had SIGTRAP events. */ | |
2143 | ||
2144 | /* First see how many SIGTRAP events we have. */ | |
2145 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
2146 | ||
2147 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2148 | random_selector = (int) | |
2149 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2150 | ||
2151 | if (debug_threads && num_events > 1) | |
2152 | fprintf (stderr, | |
2153 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2154 | num_events, random_selector); | |
2155 | ||
2156 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
2157 | select_event_lwp_callback, | |
2158 | &random_selector); | |
2159 | } | |
2160 | ||
2161 | if (event_lp != NULL) | |
2162 | { | |
2163 | /* Switch the event LWP. */ | |
2164 | *orig_lp = event_lp; | |
2165 | } | |
2166 | } | |
2167 | ||
7984d532 PA |
2168 | /* Decrement the suspend count of an LWP. */ |
2169 | ||
2170 | static int | |
2171 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2172 | { | |
2173 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2174 | ||
2175 | /* Ignore EXCEPT. */ | |
2176 | if (lwp == except) | |
2177 | return 0; | |
2178 | ||
2179 | lwp->suspended--; | |
2180 | ||
2181 | gdb_assert (lwp->suspended >= 0); | |
2182 | return 0; | |
2183 | } | |
2184 | ||
2185 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2186 | NULL. */ | |
2187 | ||
2188 | static void | |
2189 | unsuspend_all_lwps (struct lwp_info *except) | |
2190 | { | |
2191 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
2192 | } | |
2193 | ||
fa593d66 PA |
2194 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2195 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2196 | void *data); | |
2197 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2198 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2199 | struct target_waitstatus *ourstatus, | |
2200 | int target_options); | |
2201 | ||
2202 | /* Stabilize threads (move out of jump pads). | |
2203 | ||
2204 | If a thread is midway collecting a fast tracepoint, we need to | |
2205 | finish the collection and move it out of the jump pad before | |
2206 | reporting the signal. | |
2207 | ||
2208 | This avoids recursion while collecting (when a signal arrives | |
2209 | midway, and the signal handler itself collects), which would trash | |
2210 | the trace buffer. In case the user set a breakpoint in a signal | |
2211 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2212 | Most importantly, there are certain things we can't do safely if | |
2213 | threads are stopped in a jump pad (or in its callee's). For | |
2214 | example: | |
2215 | ||
2216 | - starting a new trace run. A thread still collecting the | |
2217 | previous run, could trash the trace buffer when resumed. The trace | |
2218 | buffer control structures would have been reset but the thread had | |
2219 | no way to tell. The thread could even midway memcpy'ing to the | |
2220 | buffer, which would mean that when resumed, it would clobber the | |
2221 | trace buffer that had been set for a new run. | |
2222 | ||
2223 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2224 | safely. Say you do tstart while a thread is stopped midway while | |
2225 | collecting. When the thread is later resumed, it finishes the | |
2226 | collection, and returns to the jump pad, to execute the original | |
2227 | instruction that was under the tracepoint jump at the time the | |
2228 | older run had been started. If the jump pad had been rewritten | |
2229 | since for something else in the new run, the thread would now | |
2230 | execute the wrong / random instructions. */ | |
2231 | ||
2232 | static void | |
2233 | linux_stabilize_threads (void) | |
2234 | { | |
2235 | struct thread_info *save_inferior; | |
2236 | struct lwp_info *lwp_stuck; | |
2237 | ||
2238 | lwp_stuck | |
2239 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2240 | stuck_in_jump_pad_callback, NULL); | |
2241 | if (lwp_stuck != NULL) | |
2242 | { | |
b4d51a55 PA |
2243 | if (debug_threads) |
2244 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
2245 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2246 | return; |
2247 | } | |
2248 | ||
2249 | save_inferior = current_inferior; | |
2250 | ||
2251 | stabilizing_threads = 1; | |
2252 | ||
2253 | /* Kick 'em all. */ | |
2254 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2255 | ||
2256 | /* Loop until all are stopped out of the jump pads. */ | |
2257 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2258 | { | |
2259 | struct target_waitstatus ourstatus; | |
2260 | struct lwp_info *lwp; | |
fa593d66 PA |
2261 | int wstat; |
2262 | ||
2263 | /* Note that we go through the full wait even loop. While | |
2264 | moving threads out of jump pad, we need to be able to step | |
2265 | over internal breakpoints and such. */ | |
32fcada3 | 2266 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2267 | |
2268 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2269 | { | |
2270 | lwp = get_thread_lwp (current_inferior); | |
2271 | ||
2272 | /* Lock it. */ | |
2273 | lwp->suspended++; | |
2274 | ||
a493e3e2 | 2275 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
fa593d66 PA |
2276 | || current_inferior->last_resume_kind == resume_stop) |
2277 | { | |
2ea28649 | 2278 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2279 | enqueue_one_deferred_signal (lwp, &wstat); |
2280 | } | |
2281 | } | |
2282 | } | |
2283 | ||
2284 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2285 | ||
2286 | stabilizing_threads = 0; | |
2287 | ||
2288 | current_inferior = save_inferior; | |
2289 | ||
b4d51a55 | 2290 | if (debug_threads) |
fa593d66 | 2291 | { |
b4d51a55 PA |
2292 | lwp_stuck |
2293 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2294 | stuck_in_jump_pad_callback, NULL); | |
2295 | if (lwp_stuck != NULL) | |
fa593d66 PA |
2296 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2297 | lwpid_of (lwp_stuck)); | |
2298 | } | |
2299 | } | |
2300 | ||
0d62e5e8 | 2301 | /* Wait for process, returns status. */ |
da6d8c04 | 2302 | |
95954743 PA |
2303 | static ptid_t |
2304 | linux_wait_1 (ptid_t ptid, | |
2305 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2306 | { |
e5f1222d | 2307 | int w; |
fc7238bb | 2308 | struct lwp_info *event_child; |
bd99dc85 | 2309 | int options; |
bd99dc85 | 2310 | int pid; |
6bf5e0ba PA |
2311 | int step_over_finished; |
2312 | int bp_explains_trap; | |
2313 | int maybe_internal_trap; | |
2314 | int report_to_gdb; | |
219f2f23 | 2315 | int trace_event; |
bd99dc85 PA |
2316 | |
2317 | /* Translate generic target options into linux options. */ | |
2318 | options = __WALL; | |
2319 | if (target_options & TARGET_WNOHANG) | |
2320 | options |= WNOHANG; | |
0d62e5e8 DJ |
2321 | |
2322 | retry: | |
fa593d66 PA |
2323 | bp_explains_trap = 0; |
2324 | trace_event = 0; | |
bd99dc85 PA |
2325 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2326 | ||
0d62e5e8 DJ |
2327 | /* If we were only supposed to resume one thread, only wait for |
2328 | that thread - if it's still alive. If it died, however - which | |
2329 | can happen if we're coming from the thread death case below - | |
2330 | then we need to make sure we restart the other threads. We could | |
2331 | pick a thread at random or restart all; restarting all is less | |
2332 | arbitrary. */ | |
95954743 PA |
2333 | if (!non_stop |
2334 | && !ptid_equal (cont_thread, null_ptid) | |
2335 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2336 | { |
fc7238bb PA |
2337 | struct thread_info *thread; |
2338 | ||
bd99dc85 PA |
2339 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2340 | cont_thread); | |
0d62e5e8 DJ |
2341 | |
2342 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2343 | if (thread == NULL) |
64386c31 DJ |
2344 | { |
2345 | struct thread_resume resume_info; | |
95954743 | 2346 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2347 | resume_info.kind = resume_continue; |
2348 | resume_info.sig = 0; | |
2bd7c093 | 2349 | linux_resume (&resume_info, 1); |
64386c31 | 2350 | } |
bd99dc85 | 2351 | else |
95954743 | 2352 | ptid = cont_thread; |
0d62e5e8 | 2353 | } |
da6d8c04 | 2354 | |
6bf5e0ba PA |
2355 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2356 | pid = linux_wait_for_event (ptid, &w, options); | |
2357 | else | |
2358 | { | |
2359 | if (debug_threads) | |
2360 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2361 | target_pid_to_str (step_over_bkpt)); | |
2362 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2363 | } | |
2364 | ||
bd99dc85 | 2365 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2366 | return null_ptid; |
bd99dc85 | 2367 | |
6bf5e0ba | 2368 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2369 | |
0d62e5e8 DJ |
2370 | /* If we are waiting for a particular child, and it exited, |
2371 | linux_wait_for_event will return its exit status. Similarly if | |
2372 | the last child exited. If this is not the last child, however, | |
2373 | do not report it as exited until there is a 'thread exited' response | |
2374 | available in the remote protocol. Instead, just wait for another event. | |
2375 | This should be safe, because if the thread crashed we will already | |
2376 | have reported the termination signal to GDB; that should stop any | |
2377 | in-progress stepping operations, etc. | |
2378 | ||
2379 | Report the exit status of the last thread to exit. This matches | |
2380 | LinuxThreads' behavior. */ | |
2381 | ||
95954743 | 2382 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2383 | { |
bd99dc85 | 2384 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2385 | { |
bd99dc85 PA |
2386 | if (WIFEXITED (w)) |
2387 | { | |
2388 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2389 | ourstatus->value.integer = WEXITSTATUS (w); | |
2390 | ||
2391 | if (debug_threads) | |
493e2a69 MS |
2392 | fprintf (stderr, |
2393 | "\nChild exited with retcode = %x \n", | |
2394 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2395 | } |
2396 | else | |
2397 | { | |
2398 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2ea28649 | 2399 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); |
bd99dc85 PA |
2400 | |
2401 | if (debug_threads) | |
493e2a69 MS |
2402 | fprintf (stderr, |
2403 | "\nChild terminated with signal = %x \n", | |
2404 | WTERMSIG (w)); | |
bd99dc85 PA |
2405 | |
2406 | } | |
5b1c542e | 2407 | |
3e4c1235 | 2408 | return ptid_of (event_child); |
0d62e5e8 | 2409 | } |
da6d8c04 | 2410 | } |
0d62e5e8 | 2411 | else |
da6d8c04 | 2412 | { |
0d62e5e8 DJ |
2413 | if (!WIFSTOPPED (w)) |
2414 | goto retry; | |
da6d8c04 DJ |
2415 | } |
2416 | ||
6bf5e0ba PA |
2417 | /* If this event was not handled before, and is not a SIGTRAP, we |
2418 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2419 | a breakpoint is inserted at the current PC. If this target does | |
2420 | not support internal breakpoints at all, we also report the | |
2421 | SIGTRAP without further processing; it's of no concern to us. */ | |
2422 | maybe_internal_trap | |
2423 | = (supports_breakpoints () | |
2424 | && (WSTOPSIG (w) == SIGTRAP | |
2425 | || ((WSTOPSIG (w) == SIGILL | |
2426 | || WSTOPSIG (w) == SIGSEGV) | |
2427 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2428 | ||
2429 | if (maybe_internal_trap) | |
2430 | { | |
2431 | /* Handle anything that requires bookkeeping before deciding to | |
2432 | report the event or continue waiting. */ | |
2433 | ||
2434 | /* First check if we can explain the SIGTRAP with an internal | |
2435 | breakpoint, or if we should possibly report the event to GDB. | |
2436 | Do this before anything that may remove or insert a | |
2437 | breakpoint. */ | |
2438 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2439 | ||
2440 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2441 | finished. If so, tweak the state machine accordingly, | |
2442 | reinsert breakpoints and delete any reinsert (software | |
2443 | single-step) breakpoints. */ | |
2444 | step_over_finished = finish_step_over (event_child); | |
2445 | ||
2446 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2447 | check_breakpoints (event_child->stop_pc); | |
2448 | ||
219f2f23 PA |
2449 | /* Handle tracepoint data collecting. This may overflow the |
2450 | trace buffer, and cause a tracing stop, removing | |
2451 | breakpoints. */ | |
2452 | trace_event = handle_tracepoints (event_child); | |
2453 | ||
6bf5e0ba PA |
2454 | if (bp_explains_trap) |
2455 | { | |
2456 | /* If we stepped or ran into an internal breakpoint, we've | |
2457 | already handled it. So next time we resume (from this | |
2458 | PC), we should step over it. */ | |
2459 | if (debug_threads) | |
2460 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2461 | ||
8b07ae33 PA |
2462 | if (breakpoint_here (event_child->stop_pc)) |
2463 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2464 | } |
2465 | } | |
2466 | else | |
2467 | { | |
2468 | /* We have some other signal, possibly a step-over dance was in | |
2469 | progress, and it should be cancelled too. */ | |
2470 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2471 | } |
2472 | ||
2473 | /* We have all the data we need. Either report the event to GDB, or | |
2474 | resume threads and keep waiting for more. */ | |
2475 | ||
2476 | /* If we're collecting a fast tracepoint, finish the collection and | |
2477 | move out of the jump pad before delivering a signal. See | |
2478 | linux_stabilize_threads. */ | |
2479 | ||
2480 | if (WIFSTOPPED (w) | |
2481 | && WSTOPSIG (w) != SIGTRAP | |
2482 | && supports_fast_tracepoints () | |
58b4daa5 | 2483 | && agent_loaded_p ()) |
fa593d66 PA |
2484 | { |
2485 | if (debug_threads) | |
2486 | fprintf (stderr, | |
2487 | "Got signal %d for LWP %ld. Check if we need " | |
2488 | "to defer or adjust it.\n", | |
2489 | WSTOPSIG (w), lwpid_of (event_child)); | |
2490 | ||
2491 | /* Allow debugging the jump pad itself. */ | |
2492 | if (current_inferior->last_resume_kind != resume_step | |
2493 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2494 | { | |
2495 | enqueue_one_deferred_signal (event_child, &w); | |
2496 | ||
2497 | if (debug_threads) | |
2498 | fprintf (stderr, | |
2499 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2500 | WSTOPSIG (w), lwpid_of (event_child)); | |
2501 | ||
2502 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2503 | goto retry; | |
2504 | } | |
2505 | } | |
219f2f23 | 2506 | |
fa593d66 PA |
2507 | if (event_child->collecting_fast_tracepoint) |
2508 | { | |
2509 | if (debug_threads) | |
2510 | fprintf (stderr, "\ | |
2511 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2512 | Check if we're already there.\n", | |
2513 | lwpid_of (event_child), | |
2514 | event_child->collecting_fast_tracepoint); | |
2515 | ||
2516 | trace_event = 1; | |
2517 | ||
2518 | event_child->collecting_fast_tracepoint | |
2519 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2520 | ||
2521 | if (event_child->collecting_fast_tracepoint != 1) | |
2522 | { | |
2523 | /* No longer need this breakpoint. */ | |
2524 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2525 | { | |
2526 | if (debug_threads) | |
2527 | fprintf (stderr, | |
2528 | "No longer need exit-jump-pad bkpt; removing it." | |
2529 | "stopping all threads momentarily.\n"); | |
2530 | ||
2531 | /* Other running threads could hit this breakpoint. | |
2532 | We don't handle moribund locations like GDB does, | |
2533 | instead we always pause all threads when removing | |
2534 | breakpoints, so that any step-over or | |
2535 | decr_pc_after_break adjustment is always taken | |
2536 | care of while the breakpoint is still | |
2537 | inserted. */ | |
2538 | stop_all_lwps (1, event_child); | |
2539 | cancel_breakpoints (); | |
2540 | ||
2541 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2542 | event_child->exit_jump_pad_bkpt = NULL; | |
2543 | ||
2544 | unstop_all_lwps (1, event_child); | |
2545 | ||
2546 | gdb_assert (event_child->suspended >= 0); | |
2547 | } | |
2548 | } | |
2549 | ||
2550 | if (event_child->collecting_fast_tracepoint == 0) | |
2551 | { | |
2552 | if (debug_threads) | |
2553 | fprintf (stderr, | |
2554 | "fast tracepoint finished " | |
2555 | "collecting successfully.\n"); | |
2556 | ||
2557 | /* We may have a deferred signal to report. */ | |
2558 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2559 | { | |
2560 | if (debug_threads) | |
2561 | fprintf (stderr, "dequeued one signal.\n"); | |
2562 | } | |
3c11dd79 | 2563 | else |
fa593d66 | 2564 | { |
3c11dd79 PA |
2565 | if (debug_threads) |
2566 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2567 | |
2568 | if (stabilizing_threads) | |
2569 | { | |
2570 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2571 | ourstatus->value.sig = GDB_SIGNAL_0; |
fa593d66 PA |
2572 | return ptid_of (event_child); |
2573 | } | |
2574 | } | |
2575 | } | |
6bf5e0ba PA |
2576 | } |
2577 | ||
e471f25b PA |
2578 | /* Check whether GDB would be interested in this event. */ |
2579 | ||
2580 | /* If GDB is not interested in this signal, don't stop other | |
2581 | threads, and don't report it to GDB. Just resume the inferior | |
2582 | right away. We do this for threading-related signals as well as | |
2583 | any that GDB specifically requested we ignore. But never ignore | |
2584 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2585 | stepping - they may require special handling to skip the signal | |
2586 | handler. */ | |
2587 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2588 | thread library? */ | |
2589 | if (WIFSTOPPED (w) | |
2590 | && current_inferior->last_resume_kind != resume_step | |
2591 | && ( | |
1a981360 | 2592 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2593 | (current_process ()->private->thread_db != NULL |
2594 | && (WSTOPSIG (w) == __SIGRTMIN | |
2595 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2596 | || | |
2597 | #endif | |
2ea28649 | 2598 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b PA |
2599 | && !(WSTOPSIG (w) == SIGSTOP |
2600 | && current_inferior->last_resume_kind == resume_stop)))) | |
2601 | { | |
2602 | siginfo_t info, *info_p; | |
2603 | ||
2604 | if (debug_threads) | |
2605 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2606 | WSTOPSIG (w), lwpid_of (event_child)); | |
2607 | ||
56f7af9c MS |
2608 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), |
2609 | (PTRACE_ARG3_TYPE) 0, &info) == 0) | |
e471f25b PA |
2610 | info_p = &info; |
2611 | else | |
2612 | info_p = NULL; | |
2613 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2614 | WSTOPSIG (w), info_p); | |
2615 | goto retry; | |
2616 | } | |
2617 | ||
2618 | /* If GDB wanted this thread to single step, we always want to | |
2619 | report the SIGTRAP, and let GDB handle it. Watchpoints should | |
2620 | always be reported. So should signals we can't explain. A | |
2621 | SIGTRAP we can't explain could be a GDB breakpoint --- we may or | |
2622 | not support Z0 breakpoints. If we do, we're be able to handle | |
2623 | GDB breakpoints on top of internal breakpoints, by handling the | |
2624 | internal breakpoint and still reporting the event to GDB. If we | |
2625 | don't, we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 2626 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 2627 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 2628 | || event_child->stopped_by_watchpoint |
493e2a69 MS |
2629 | || (!step_over_finished |
2630 | && !bp_explains_trap && !trace_event) | |
9f3a5c85 | 2631 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2632 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2633 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2634 | ||
2635 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2636 | |
2637 | /* We found no reason GDB would want us to stop. We either hit one | |
2638 | of our own breakpoints, or finished an internal step GDB | |
2639 | shouldn't know about. */ | |
2640 | if (!report_to_gdb) | |
2641 | { | |
2642 | if (debug_threads) | |
2643 | { | |
2644 | if (bp_explains_trap) | |
2645 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2646 | if (step_over_finished) | |
2647 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2648 | if (trace_event) |
2649 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
2650 | } |
2651 | ||
2652 | /* We're not reporting this breakpoint to GDB, so apply the | |
2653 | decr_pc_after_break adjustment to the inferior's regcache | |
2654 | ourselves. */ | |
2655 | ||
2656 | if (the_low_target.set_pc != NULL) | |
2657 | { | |
2658 | struct regcache *regcache | |
2659 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2660 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2661 | } | |
2662 | ||
7984d532 PA |
2663 | /* We may have finished stepping over a breakpoint. If so, |
2664 | we've stopped and suspended all LWPs momentarily except the | |
2665 | stepping one. This is where we resume them all again. We're | |
2666 | going to keep waiting, so use proceed, which handles stepping | |
2667 | over the next breakpoint. */ | |
6bf5e0ba PA |
2668 | if (debug_threads) |
2669 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2670 | |
2671 | if (step_over_finished) | |
2672 | unsuspend_all_lwps (event_child); | |
2673 | ||
6bf5e0ba PA |
2674 | proceed_all_lwps (); |
2675 | goto retry; | |
2676 | } | |
2677 | ||
2678 | if (debug_threads) | |
2679 | { | |
8336d594 | 2680 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
2681 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
2682 | if (event_child->stopped_by_watchpoint) | |
2683 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2684 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2685 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2686 | if (debug_threads) |
2687 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2688 | } | |
2689 | ||
2690 | /* Alright, we're going to report a stop. */ | |
2691 | ||
fa593d66 | 2692 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2693 | { |
2694 | /* In all-stop, stop all threads. */ | |
7984d532 | 2695 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2696 | |
2697 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2698 | from among those that have had events. Giving equal priority | |
2699 | to all LWPs that have had events helps prevent | |
2700 | starvation. */ | |
2701 | if (ptid_equal (ptid, minus_one_ptid)) | |
2702 | { | |
2703 | event_child->status_pending_p = 1; | |
2704 | event_child->status_pending = w; | |
2705 | ||
2706 | select_event_lwp (&event_child); | |
2707 | ||
2708 | event_child->status_pending_p = 0; | |
2709 | w = event_child->status_pending; | |
2710 | } | |
2711 | ||
2712 | /* Now that we've selected our final event LWP, cancel any | |
2713 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2714 | See the comment in cancel_breakpoints_callback to find out | |
2715 | why. */ | |
2716 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 | 2717 | |
c03e6ccc YQ |
2718 | /* If we were going a step-over, all other threads but the stepping one |
2719 | had been paused in start_step_over, with their suspend counts | |
2720 | incremented. We don't want to do a full unstop/unpause, because we're | |
2721 | in all-stop mode (so we want threads stopped), but we still need to | |
2722 | unsuspend the other threads, to decrement their `suspended' count | |
2723 | back. */ | |
2724 | if (step_over_finished) | |
2725 | unsuspend_all_lwps (event_child); | |
2726 | ||
fa593d66 PA |
2727 | /* Stabilize threads (move out of jump pads). */ |
2728 | stabilize_threads (); | |
6bf5e0ba PA |
2729 | } |
2730 | else | |
2731 | { | |
2732 | /* If we just finished a step-over, then all threads had been | |
2733 | momentarily paused. In all-stop, that's fine, we want | |
2734 | threads stopped by now anyway. In non-stop, we need to | |
2735 | re-resume threads that GDB wanted to be running. */ | |
2736 | if (step_over_finished) | |
7984d532 | 2737 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2738 | } |
2739 | ||
5b1c542e | 2740 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2741 | |
8336d594 PA |
2742 | if (current_inferior->last_resume_kind == resume_stop |
2743 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2744 | { |
2745 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2746 | and it stopped cleanly, so report as SIG0. The use of | |
2747 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2748 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2749 | } |
8336d594 PA |
2750 | else if (current_inferior->last_resume_kind == resume_stop |
2751 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2752 | { |
2753 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2754 | but, it stopped for other reasons. */ |
2ea28649 | 2755 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2756 | } |
2757 | else | |
2758 | { | |
2ea28649 | 2759 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2760 | } |
2761 | ||
d50171e4 PA |
2762 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2763 | ||
bd99dc85 | 2764 | if (debug_threads) |
95954743 | 2765 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2766 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2767 | ourstatus->kind, |
2768 | ourstatus->value.sig); | |
2769 | ||
6bf5e0ba | 2770 | return ptid_of (event_child); |
bd99dc85 PA |
2771 | } |
2772 | ||
2773 | /* Get rid of any pending event in the pipe. */ | |
2774 | static void | |
2775 | async_file_flush (void) | |
2776 | { | |
2777 | int ret; | |
2778 | char buf; | |
2779 | ||
2780 | do | |
2781 | ret = read (linux_event_pipe[0], &buf, 1); | |
2782 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2783 | } | |
2784 | ||
2785 | /* Put something in the pipe, so the event loop wakes up. */ | |
2786 | static void | |
2787 | async_file_mark (void) | |
2788 | { | |
2789 | int ret; | |
2790 | ||
2791 | async_file_flush (); | |
2792 | ||
2793 | do | |
2794 | ret = write (linux_event_pipe[1], "+", 1); | |
2795 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2796 | ||
2797 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2798 | be awakened anyway. */ | |
2799 | } | |
2800 | ||
95954743 PA |
2801 | static ptid_t |
2802 | linux_wait (ptid_t ptid, | |
2803 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2804 | { |
95954743 | 2805 | ptid_t event_ptid; |
bd99dc85 PA |
2806 | |
2807 | if (debug_threads) | |
95954743 | 2808 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2809 | |
2810 | /* Flush the async file first. */ | |
2811 | if (target_is_async_p ()) | |
2812 | async_file_flush (); | |
2813 | ||
95954743 | 2814 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2815 | |
2816 | /* If at least one stop was reported, there may be more. A single | |
2817 | SIGCHLD can signal more than one child stop. */ | |
2818 | if (target_is_async_p () | |
2819 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2820 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2821 | async_file_mark (); |
2822 | ||
2823 | return event_ptid; | |
da6d8c04 DJ |
2824 | } |
2825 | ||
c5f62d5f | 2826 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2827 | |
2828 | static int | |
a1928bad | 2829 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2830 | { |
c5f62d5f DE |
2831 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2832 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2833 | |
c5f62d5f DE |
2834 | #ifdef __NR_tkill |
2835 | { | |
2836 | static int tkill_failed; | |
fd500816 | 2837 | |
c5f62d5f DE |
2838 | if (!tkill_failed) |
2839 | { | |
2840 | int ret; | |
2841 | ||
2842 | errno = 0; | |
2843 | ret = syscall (__NR_tkill, lwpid, signo); | |
2844 | if (errno != ENOSYS) | |
2845 | return ret; | |
2846 | tkill_failed = 1; | |
2847 | } | |
2848 | } | |
fd500816 DJ |
2849 | #endif |
2850 | ||
2851 | return kill (lwpid, signo); | |
2852 | } | |
2853 | ||
964e4306 PA |
2854 | void |
2855 | linux_stop_lwp (struct lwp_info *lwp) | |
2856 | { | |
2857 | send_sigstop (lwp); | |
2858 | } | |
2859 | ||
0d62e5e8 | 2860 | static void |
02fc4de7 | 2861 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2862 | { |
bd99dc85 | 2863 | int pid; |
0d62e5e8 | 2864 | |
bd99dc85 PA |
2865 | pid = lwpid_of (lwp); |
2866 | ||
0d62e5e8 DJ |
2867 | /* If we already have a pending stop signal for this process, don't |
2868 | send another. */ | |
54a0b537 | 2869 | if (lwp->stop_expected) |
0d62e5e8 | 2870 | { |
ae13219e | 2871 | if (debug_threads) |
bd99dc85 | 2872 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2873 | |
0d62e5e8 DJ |
2874 | return; |
2875 | } | |
2876 | ||
2877 | if (debug_threads) | |
bd99dc85 | 2878 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2879 | |
d50171e4 | 2880 | lwp->stop_expected = 1; |
bd99dc85 | 2881 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2882 | } |
2883 | ||
7984d532 PA |
2884 | static int |
2885 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2886 | { |
2887 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2888 | ||
7984d532 PA |
2889 | /* Ignore EXCEPT. */ |
2890 | if (lwp == except) | |
2891 | return 0; | |
2892 | ||
02fc4de7 | 2893 | if (lwp->stopped) |
7984d532 | 2894 | return 0; |
02fc4de7 PA |
2895 | |
2896 | send_sigstop (lwp); | |
7984d532 PA |
2897 | return 0; |
2898 | } | |
2899 | ||
2900 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2901 | yet. */ | |
2902 | static int | |
2903 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2904 | void *except) | |
2905 | { | |
2906 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2907 | ||
2908 | /* Ignore EXCEPT. */ | |
2909 | if (lwp == except) | |
2910 | return 0; | |
2911 | ||
2912 | lwp->suspended++; | |
2913 | ||
2914 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2915 | } |
2916 | ||
95954743 PA |
2917 | static void |
2918 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2919 | { | |
2920 | /* It's dead, really. */ | |
2921 | lwp->dead = 1; | |
2922 | ||
2923 | /* Store the exit status for later. */ | |
2924 | lwp->status_pending_p = 1; | |
2925 | lwp->status_pending = wstat; | |
2926 | ||
95954743 PA |
2927 | /* Prevent trying to stop it. */ |
2928 | lwp->stopped = 1; | |
2929 | ||
2930 | /* No further stops are expected from a dead lwp. */ | |
2931 | lwp->stop_expected = 0; | |
2932 | } | |
2933 | ||
0d62e5e8 DJ |
2934 | static void |
2935 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2936 | { | |
54a0b537 | 2937 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2938 | struct thread_info *saved_inferior; |
a1928bad | 2939 | int wstat; |
95954743 PA |
2940 | ptid_t saved_tid; |
2941 | ptid_t ptid; | |
d50171e4 | 2942 | int pid; |
0d62e5e8 | 2943 | |
54a0b537 | 2944 | if (lwp->stopped) |
d50171e4 PA |
2945 | { |
2946 | if (debug_threads) | |
2947 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2948 | lwpid_of (lwp)); | |
2949 | return; | |
2950 | } | |
0d62e5e8 DJ |
2951 | |
2952 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2953 | if (saved_inferior != NULL) |
2954 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2955 | else | |
95954743 | 2956 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2957 | |
95954743 | 2958 | ptid = lwp->head.id; |
bd99dc85 | 2959 | |
d50171e4 PA |
2960 | if (debug_threads) |
2961 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2962 | ||
2963 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2964 | |
2965 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2966 | and record the pending SIGSTOP. If the process exited, just | |
2967 | return. */ | |
d50171e4 | 2968 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2969 | { |
2970 | if (debug_threads) | |
d50171e4 PA |
2971 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2972 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2973 | |
d50171e4 | 2974 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2975 | { |
2976 | if (debug_threads) | |
d50171e4 PA |
2977 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2978 | lwpid_of (lwp), wstat); | |
2979 | ||
c35fafde PA |
2980 | lwp->status_pending_p = 1; |
2981 | lwp->status_pending = wstat; | |
2982 | } | |
0d62e5e8 | 2983 | } |
d50171e4 | 2984 | else |
95954743 PA |
2985 | { |
2986 | if (debug_threads) | |
d50171e4 | 2987 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2988 | |
d50171e4 PA |
2989 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2990 | if (lwp) | |
2991 | { | |
2992 | /* Leave this status pending for the next time we're able to | |
2993 | report it. In the mean time, we'll report this lwp as | |
2994 | dead to GDB, so GDB doesn't try to read registers and | |
2995 | memory from it. This can only happen if this was the | |
2996 | last thread of the process; otherwise, PID is removed | |
2997 | from the thread tables before linux_wait_for_event | |
2998 | returns. */ | |
2999 | mark_lwp_dead (lwp, wstat); | |
3000 | } | |
95954743 | 3001 | } |
0d62e5e8 | 3002 | |
bd99dc85 | 3003 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
3004 | current_inferior = saved_inferior; |
3005 | else | |
3006 | { | |
3007 | if (debug_threads) | |
3008 | fprintf (stderr, "Previously current thread died.\n"); | |
3009 | ||
bd99dc85 PA |
3010 | if (non_stop) |
3011 | { | |
3012 | /* We can't change the current inferior behind GDB's back, | |
3013 | otherwise, a subsequent command may apply to the wrong | |
3014 | process. */ | |
3015 | current_inferior = NULL; | |
3016 | } | |
3017 | else | |
3018 | { | |
3019 | /* Set a valid thread as current. */ | |
3020 | set_desired_inferior (0); | |
3021 | } | |
0d62e5e8 DJ |
3022 | } |
3023 | } | |
3024 | ||
fa593d66 PA |
3025 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3026 | move it out, because we need to report the stop event to GDB. For | |
3027 | example, if the user puts a breakpoint in the jump pad, it's | |
3028 | because she wants to debug it. */ | |
3029 | ||
3030 | static int | |
3031 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3032 | { | |
3033 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3034 | struct thread_info *thread = get_lwp_thread (lwp); | |
3035 | ||
3036 | gdb_assert (lwp->suspended == 0); | |
3037 | gdb_assert (lwp->stopped); | |
3038 | ||
3039 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3040 | return (supports_fast_tracepoints () | |
58b4daa5 | 3041 | && agent_loaded_p () |
fa593d66 PA |
3042 | && (gdb_breakpoint_here (lwp->stop_pc) |
3043 | || lwp->stopped_by_watchpoint | |
3044 | || thread->last_resume_kind == resume_step) | |
3045 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3046 | } | |
3047 | ||
3048 | static void | |
3049 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3050 | { | |
3051 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3052 | struct thread_info *thread = get_lwp_thread (lwp); | |
3053 | int *wstat; | |
3054 | ||
3055 | gdb_assert (lwp->suspended == 0); | |
3056 | gdb_assert (lwp->stopped); | |
3057 | ||
3058 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3059 | ||
3060 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3061 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
3062 | && !lwp->stopped_by_watchpoint | |
3063 | && thread->last_resume_kind != resume_step | |
3064 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3065 | { | |
3066 | if (debug_threads) | |
3067 | fprintf (stderr, | |
3068 | "LWP %ld needs stabilizing (in jump pad)\n", | |
3069 | lwpid_of (lwp)); | |
3070 | ||
3071 | if (wstat) | |
3072 | { | |
3073 | lwp->status_pending_p = 0; | |
3074 | enqueue_one_deferred_signal (lwp, wstat); | |
3075 | ||
3076 | if (debug_threads) | |
3077 | fprintf (stderr, | |
3078 | "Signal %d for LWP %ld deferred " | |
3079 | "(in jump pad)\n", | |
3080 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
3081 | } | |
3082 | ||
3083 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3084 | } | |
3085 | else | |
3086 | lwp->suspended++; | |
3087 | } | |
3088 | ||
3089 | static int | |
3090 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3091 | { | |
3092 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3093 | ||
3094 | if (lwp->dead) | |
3095 | return 0; | |
3096 | if (lwp->stopped) | |
3097 | return 0; | |
3098 | return 1; | |
3099 | } | |
3100 | ||
7984d532 PA |
3101 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3102 | If SUSPEND, then also increase the suspend count of every LWP, | |
3103 | except EXCEPT. */ | |
3104 | ||
0d62e5e8 | 3105 | static void |
7984d532 | 3106 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3107 | { |
bde24c0a PA |
3108 | /* Should not be called recursively. */ |
3109 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3110 | ||
3111 | stopping_threads = (suspend | |
3112 | ? STOPPING_AND_SUSPENDING_THREADS | |
3113 | : STOPPING_THREADS); | |
7984d532 PA |
3114 | |
3115 | if (suspend) | |
3116 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
3117 | else | |
3118 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 3119 | for_each_inferior (&all_lwps, wait_for_sigstop); |
bde24c0a | 3120 | stopping_threads = NOT_STOPPING_THREADS; |
0d62e5e8 DJ |
3121 | } |
3122 | ||
da6d8c04 DJ |
3123 | /* Resume execution of the inferior process. |
3124 | If STEP is nonzero, single-step it. | |
3125 | If SIGNAL is nonzero, give it that signal. */ | |
3126 | ||
ce3a066d | 3127 | static void |
2acc282a | 3128 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3129 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3130 | { |
0d62e5e8 | 3131 | struct thread_info *saved_inferior; |
fa593d66 | 3132 | int fast_tp_collecting; |
0d62e5e8 | 3133 | |
54a0b537 | 3134 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3135 | return; |
3136 | ||
fa593d66 PA |
3137 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3138 | ||
3139 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3140 | ||
219f2f23 PA |
3141 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3142 | user used the "jump" command, or "set $pc = foo"). */ | |
3143 | if (lwp->stop_pc != get_pc (lwp)) | |
3144 | { | |
3145 | /* Collecting 'while-stepping' actions doesn't make sense | |
3146 | anymore. */ | |
3147 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
3148 | } | |
3149 | ||
0d62e5e8 DJ |
3150 | /* If we have pending signals or status, and a new signal, enqueue the |
3151 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3152 | breakpoint; it will be picked up again below. */ | |
3153 | if (signal != 0 | |
fa593d66 PA |
3154 | && (lwp->status_pending_p |
3155 | || lwp->pending_signals != NULL | |
3156 | || lwp->bp_reinsert != 0 | |
3157 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3158 | { |
3159 | struct pending_signals *p_sig; | |
bca929d3 | 3160 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3161 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3162 | p_sig->signal = signal; |
32ca6d61 DJ |
3163 | if (info == NULL) |
3164 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3165 | else | |
3166 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3167 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3168 | } |
3169 | ||
d50171e4 PA |
3170 | if (lwp->status_pending_p) |
3171 | { | |
3172 | if (debug_threads) | |
3173 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
3174 | " has pending status\n", | |
3175 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
3176 | lwp->stop_expected ? "expected" : "not expected"); | |
3177 | return; | |
3178 | } | |
0d62e5e8 DJ |
3179 | |
3180 | saved_inferior = current_inferior; | |
54a0b537 | 3181 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
3182 | |
3183 | if (debug_threads) | |
1b3f6016 | 3184 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 3185 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 3186 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3187 | |
3188 | /* This bit needs some thinking about. If we get a signal that | |
3189 | we must report while a single-step reinsert is still pending, | |
3190 | we often end up resuming the thread. It might be better to | |
3191 | (ew) allow a stack of pending events; then we could be sure that | |
3192 | the reinsert happened right away and not lose any signals. | |
3193 | ||
3194 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3195 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3196 | complete correctness, so it won't solve that problem. It may be |
3197 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3198 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3199 | { |
3200 | if (debug_threads) | |
d50171e4 PA |
3201 | fprintf (stderr, " pending reinsert at 0x%s\n", |
3202 | paddress (lwp->bp_reinsert)); | |
3203 | ||
85e00e85 | 3204 | if (can_hardware_single_step ()) |
d50171e4 | 3205 | { |
fa593d66 PA |
3206 | if (fast_tp_collecting == 0) |
3207 | { | |
3208 | if (step == 0) | |
3209 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3210 | if (lwp->suspended) | |
3211 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3212 | lwp->suspended); | |
3213 | } | |
d50171e4 PA |
3214 | |
3215 | step = 1; | |
3216 | } | |
0d62e5e8 DJ |
3217 | |
3218 | /* Postpone any pending signal. It was enqueued above. */ | |
3219 | signal = 0; | |
3220 | } | |
3221 | ||
fa593d66 PA |
3222 | if (fast_tp_collecting == 1) |
3223 | { | |
3224 | if (debug_threads) | |
3225 | fprintf (stderr, "\ | |
3226 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
3227 | lwpid_of (lwp)); | |
3228 | ||
3229 | /* Postpone any pending signal. It was enqueued above. */ | |
3230 | signal = 0; | |
3231 | } | |
3232 | else if (fast_tp_collecting == 2) | |
3233 | { | |
3234 | if (debug_threads) | |
3235 | fprintf (stderr, "\ | |
3236 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
3237 | lwpid_of (lwp)); | |
3238 | ||
3239 | if (can_hardware_single_step ()) | |
3240 | step = 1; | |
3241 | else | |
3242 | fatal ("moving out of jump pad single-stepping" | |
3243 | " not implemented on this target"); | |
3244 | ||
3245 | /* Postpone any pending signal. It was enqueued above. */ | |
3246 | signal = 0; | |
3247 | } | |
3248 | ||
219f2f23 PA |
3249 | /* If we have while-stepping actions in this thread set it stepping. |
3250 | If we have a signal to deliver, it may or may not be set to | |
3251 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3252 | while-stepping into a signal handler. A possible smart thing to | |
3253 | do would be to set an internal breakpoint at the signal return | |
3254 | address, continue, and carry on catching this while-stepping | |
3255 | action only when that breakpoint is hit. A future | |
3256 | enhancement. */ | |
3257 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
3258 | && can_hardware_single_step ()) | |
3259 | { | |
3260 | if (debug_threads) | |
3261 | fprintf (stderr, | |
3262 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
3263 | lwpid_of (lwp)); | |
3264 | step = 1; | |
3265 | } | |
3266 | ||
aa691b87 | 3267 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3268 | { |
442ea881 PA |
3269 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3270 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 3271 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3272 | } |
3273 | ||
fa593d66 PA |
3274 | /* If we have pending signals, consume one unless we are trying to |
3275 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3276 | collect. */ | |
3277 | if (lwp->pending_signals != NULL | |
3278 | && lwp->bp_reinsert == 0 | |
3279 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3280 | { |
3281 | struct pending_signals **p_sig; | |
3282 | ||
54a0b537 | 3283 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3284 | while ((*p_sig)->prev != NULL) |
3285 | p_sig = &(*p_sig)->prev; | |
3286 | ||
3287 | signal = (*p_sig)->signal; | |
32ca6d61 | 3288 | if ((*p_sig)->info.si_signo != 0) |
56f7af9c MS |
3289 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
3290 | &(*p_sig)->info); | |
32ca6d61 | 3291 | |
0d62e5e8 DJ |
3292 | free (*p_sig); |
3293 | *p_sig = NULL; | |
3294 | } | |
3295 | ||
aa5ca48f DE |
3296 | if (the_low_target.prepare_to_resume != NULL) |
3297 | the_low_target.prepare_to_resume (lwp); | |
3298 | ||
0d62e5e8 | 3299 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 3300 | get_lwp_thread (lwp)); |
da6d8c04 | 3301 | errno = 0; |
54a0b537 | 3302 | lwp->stopped = 0; |
c3adc08c | 3303 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3304 | lwp->stepping = step; |
56f7af9c MS |
3305 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), |
3306 | (PTRACE_ARG3_TYPE) 0, | |
14ce3065 DE |
3307 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3308 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3309 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
3310 | |
3311 | current_inferior = saved_inferior; | |
da6d8c04 | 3312 | if (errno) |
3221518c UW |
3313 | { |
3314 | /* ESRCH from ptrace either means that the thread was already | |
3315 | running (an error) or that it is gone (a race condition). If | |
3316 | it's gone, we will get a notification the next time we wait, | |
3317 | so we can ignore the error. We could differentiate these | |
3318 | two, but it's tricky without waiting; the thread still exists | |
3319 | as a zombie, so sending it signal 0 would succeed. So just | |
3320 | ignore ESRCH. */ | |
3321 | if (errno == ESRCH) | |
3322 | return; | |
3323 | ||
3324 | perror_with_name ("ptrace"); | |
3325 | } | |
da6d8c04 DJ |
3326 | } |
3327 | ||
2bd7c093 PA |
3328 | struct thread_resume_array |
3329 | { | |
3330 | struct thread_resume *resume; | |
3331 | size_t n; | |
3332 | }; | |
64386c31 DJ |
3333 | |
3334 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
3335 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
3336 | resume request. | |
3337 | ||
3338 | This algorithm is O(threads * resume elements), but resume elements | |
3339 | is small (and will remain small at least until GDB supports thread | |
3340 | suspension). */ | |
2bd7c093 PA |
3341 | static int |
3342 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3343 | { |
54a0b537 | 3344 | struct lwp_info *lwp; |
64386c31 | 3345 | struct thread_info *thread; |
5544ad89 | 3346 | int ndx; |
2bd7c093 | 3347 | struct thread_resume_array *r; |
64386c31 DJ |
3348 | |
3349 | thread = (struct thread_info *) entry; | |
54a0b537 | 3350 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3351 | r = arg; |
64386c31 | 3352 | |
2bd7c093 | 3353 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3354 | { |
3355 | ptid_t ptid = r->resume[ndx].thread; | |
3356 | if (ptid_equal (ptid, minus_one_ptid) | |
3357 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3358 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3359 | of PID'. */ | |
3360 | || (ptid_get_pid (ptid) == pid_of (lwp) | |
3361 | && (ptid_is_pid (ptid) | |
3362 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3363 | { |
d50171e4 | 3364 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3365 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3366 | { |
3367 | if (debug_threads) | |
3368 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3369 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3370 | ? "stopped" | |
3371 | : "stopping", | |
3372 | lwpid_of (lwp)); | |
3373 | ||
3374 | continue; | |
3375 | } | |
3376 | ||
95954743 | 3377 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3378 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 PA |
3379 | |
3380 | /* If we had a deferred signal to report, dequeue one now. | |
3381 | This can happen if LWP gets more than one signal while | |
3382 | trying to get out of a jump pad. */ | |
3383 | if (lwp->stopped | |
3384 | && !lwp->status_pending_p | |
3385 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3386 | { | |
3387 | lwp->status_pending_p = 1; | |
3388 | ||
3389 | if (debug_threads) | |
3390 | fprintf (stderr, | |
3391 | "Dequeueing deferred signal %d for LWP %ld, " | |
3392 | "leaving status pending.\n", | |
3393 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3394 | } | |
3395 | ||
95954743 PA |
3396 | return 0; |
3397 | } | |
3398 | } | |
2bd7c093 PA |
3399 | |
3400 | /* No resume action for this thread. */ | |
3401 | lwp->resume = NULL; | |
64386c31 | 3402 | |
2bd7c093 | 3403 | return 0; |
5544ad89 DJ |
3404 | } |
3405 | ||
5544ad89 | 3406 | |
bd99dc85 PA |
3407 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3408 | static int | |
3409 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3410 | { |
bd99dc85 | 3411 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3412 | |
bd99dc85 PA |
3413 | /* LWPs which will not be resumed are not interesting, because |
3414 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3415 | if (lwp->resume == NULL) |
bd99dc85 | 3416 | return 0; |
64386c31 | 3417 | |
bd99dc85 | 3418 | if (lwp->status_pending_p) |
d50171e4 PA |
3419 | * (int *) flag_p = 1; |
3420 | ||
3421 | return 0; | |
3422 | } | |
3423 | ||
3424 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3425 | internal breakpoint that we need to step over. It assumes that any | |
3426 | required STOP_PC adjustment has already been propagated to the | |
3427 | inferior's regcache. */ | |
3428 | ||
3429 | static int | |
3430 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3431 | { | |
3432 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3433 | struct thread_info *thread; |
d50171e4 PA |
3434 | struct thread_info *saved_inferior; |
3435 | CORE_ADDR pc; | |
3436 | ||
3437 | /* LWPs which will not be resumed are not interesting, because we | |
3438 | might not wait for them next time through linux_wait. */ | |
3439 | ||
3440 | if (!lwp->stopped) | |
3441 | { | |
3442 | if (debug_threads) | |
3443 | fprintf (stderr, | |
3444 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3445 | lwpid_of (lwp)); | |
3446 | return 0; | |
3447 | } | |
3448 | ||
8336d594 PA |
3449 | thread = get_lwp_thread (lwp); |
3450 | ||
3451 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3452 | { |
3453 | if (debug_threads) | |
3454 | fprintf (stderr, | |
3455 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3456 | lwpid_of (lwp)); | |
3457 | return 0; | |
3458 | } | |
3459 | ||
7984d532 PA |
3460 | gdb_assert (lwp->suspended >= 0); |
3461 | ||
3462 | if (lwp->suspended) | |
3463 | { | |
3464 | if (debug_threads) | |
3465 | fprintf (stderr, | |
3466 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3467 | lwpid_of (lwp)); | |
3468 | return 0; | |
3469 | } | |
3470 | ||
d50171e4 PA |
3471 | if (!lwp->need_step_over) |
3472 | { | |
3473 | if (debug_threads) | |
3474 | fprintf (stderr, | |
3475 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3476 | } | |
5544ad89 | 3477 | |
bd99dc85 | 3478 | if (lwp->status_pending_p) |
d50171e4 PA |
3479 | { |
3480 | if (debug_threads) | |
3481 | fprintf (stderr, | |
3482 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3483 | lwpid_of (lwp)); | |
3484 | return 0; | |
3485 | } | |
3486 | ||
3487 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3488 | or we have. */ | |
3489 | pc = get_pc (lwp); | |
3490 | ||
3491 | /* If the PC has changed since we stopped, then don't do anything, | |
3492 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3493 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3494 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3495 | command, or poked thread's registers herself. */ | |
3496 | if (pc != lwp->stop_pc) | |
3497 | { | |
3498 | if (debug_threads) | |
3499 | fprintf (stderr, | |
3500 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3501 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3502 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3503 | ||
3504 | lwp->need_step_over = 0; | |
3505 | return 0; | |
3506 | } | |
3507 | ||
3508 | saved_inferior = current_inferior; | |
8336d594 | 3509 | current_inferior = thread; |
d50171e4 | 3510 | |
8b07ae33 | 3511 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3512 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3513 | { |
8b07ae33 | 3514 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3515 | though. If the condition is being evaluated on the target's side |
3516 | and it evaluate to false, step over this breakpoint as well. */ | |
3517 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3518 | && gdb_condition_true_at_breakpoint (pc) |
3519 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3520 | { |
3521 | if (debug_threads) | |
3522 | fprintf (stderr, | |
3523 | "Need step over [LWP %ld]? yes, but found" | |
3524 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3525 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3526 | |
8b07ae33 PA |
3527 | current_inferior = saved_inferior; |
3528 | return 0; | |
3529 | } | |
3530 | else | |
3531 | { | |
3532 | if (debug_threads) | |
3533 | fprintf (stderr, | |
493e2a69 MS |
3534 | "Need step over [LWP %ld]? yes, " |
3535 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3536 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3537 | |
8b07ae33 PA |
3538 | /* We've found an lwp that needs stepping over --- return 1 so |
3539 | that find_inferior stops looking. */ | |
3540 | current_inferior = saved_inferior; | |
3541 | ||
3542 | /* If the step over is cancelled, this is set again. */ | |
3543 | lwp->need_step_over = 0; | |
3544 | return 1; | |
3545 | } | |
d50171e4 PA |
3546 | } |
3547 | ||
3548 | current_inferior = saved_inferior; | |
3549 | ||
3550 | if (debug_threads) | |
3551 | fprintf (stderr, | |
3552 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3553 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3554 | |
bd99dc85 | 3555 | return 0; |
5544ad89 DJ |
3556 | } |
3557 | ||
d50171e4 PA |
3558 | /* Start a step-over operation on LWP. When LWP stopped at a |
3559 | breakpoint, to make progress, we need to remove the breakpoint out | |
3560 | of the way. If we let other threads run while we do that, they may | |
3561 | pass by the breakpoint location and miss hitting it. To avoid | |
3562 | that, a step-over momentarily stops all threads while LWP is | |
3563 | single-stepped while the breakpoint is temporarily uninserted from | |
3564 | the inferior. When the single-step finishes, we reinsert the | |
3565 | breakpoint, and let all threads that are supposed to be running, | |
3566 | run again. | |
3567 | ||
3568 | On targets that don't support hardware single-step, we don't | |
3569 | currently support full software single-stepping. Instead, we only | |
3570 | support stepping over the thread event breakpoint, by asking the | |
3571 | low target where to place a reinsert breakpoint. Since this | |
3572 | routine assumes the breakpoint being stepped over is a thread event | |
3573 | breakpoint, it usually assumes the return address of the current | |
3574 | function is a good enough place to set the reinsert breakpoint. */ | |
3575 | ||
3576 | static int | |
3577 | start_step_over (struct lwp_info *lwp) | |
3578 | { | |
3579 | struct thread_info *saved_inferior; | |
3580 | CORE_ADDR pc; | |
3581 | int step; | |
3582 | ||
3583 | if (debug_threads) | |
3584 | fprintf (stderr, | |
3585 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3586 | lwpid_of (lwp)); | |
3587 | ||
7984d532 PA |
3588 | stop_all_lwps (1, lwp); |
3589 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3590 | |
3591 | if (debug_threads) | |
3592 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3593 | ||
3594 | /* Note, we should always reach here with an already adjusted PC, | |
3595 | either by GDB (if we're resuming due to GDB's request), or by our | |
3596 | caller, if we just finished handling an internal breakpoint GDB | |
3597 | shouldn't care about. */ | |
3598 | pc = get_pc (lwp); | |
3599 | ||
3600 | saved_inferior = current_inferior; | |
3601 | current_inferior = get_lwp_thread (lwp); | |
3602 | ||
3603 | lwp->bp_reinsert = pc; | |
3604 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3605 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3606 | |
3607 | if (can_hardware_single_step ()) | |
3608 | { | |
3609 | step = 1; | |
3610 | } | |
3611 | else | |
3612 | { | |
3613 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3614 | set_reinsert_breakpoint (raddr); | |
3615 | step = 0; | |
3616 | } | |
3617 | ||
3618 | current_inferior = saved_inferior; | |
3619 | ||
3620 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3621 | ||
3622 | /* Require next event from this LWP. */ | |
3623 | step_over_bkpt = lwp->head.id; | |
3624 | return 1; | |
3625 | } | |
3626 | ||
3627 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3628 | start_step_over, if still there, and delete any reinsert | |
3629 | breakpoints we've set, on non hardware single-step targets. */ | |
3630 | ||
3631 | static int | |
3632 | finish_step_over (struct lwp_info *lwp) | |
3633 | { | |
3634 | if (lwp->bp_reinsert != 0) | |
3635 | { | |
3636 | if (debug_threads) | |
3637 | fprintf (stderr, "Finished step over.\n"); | |
3638 | ||
3639 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3640 | may be no breakpoint to reinsert there by now. */ | |
3641 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3642 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3643 | |
3644 | lwp->bp_reinsert = 0; | |
3645 | ||
3646 | /* Delete any software-single-step reinsert breakpoints. No | |
3647 | longer needed. We don't have to worry about other threads | |
3648 | hitting this trap, and later not being able to explain it, | |
3649 | because we were stepping over a breakpoint, and we hold all | |
3650 | threads but LWP stopped while doing that. */ | |
3651 | if (!can_hardware_single_step ()) | |
3652 | delete_reinsert_breakpoints (); | |
3653 | ||
3654 | step_over_bkpt = null_ptid; | |
3655 | return 1; | |
3656 | } | |
3657 | else | |
3658 | return 0; | |
3659 | } | |
3660 | ||
5544ad89 DJ |
3661 | /* This function is called once per thread. We check the thread's resume |
3662 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3663 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3664 | |
bd99dc85 PA |
3665 | For threads which we aren't explicitly told otherwise, we preserve |
3666 | the stepping flag; this is used for stepping over gdbserver-placed | |
3667 | breakpoints. | |
3668 | ||
3669 | If pending_flags was set in any thread, we queue any needed | |
3670 | signals, since we won't actually resume. We already have a pending | |
3671 | event to report, so we don't need to preserve any step requests; | |
3672 | they should be re-issued if necessary. */ | |
3673 | ||
3674 | static int | |
3675 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3676 | { |
54a0b537 | 3677 | struct lwp_info *lwp; |
5544ad89 | 3678 | struct thread_info *thread; |
bd99dc85 | 3679 | int step; |
d50171e4 PA |
3680 | int leave_all_stopped = * (int *) arg; |
3681 | int leave_pending; | |
5544ad89 DJ |
3682 | |
3683 | thread = (struct thread_info *) entry; | |
54a0b537 | 3684 | lwp = get_thread_lwp (thread); |
5544ad89 | 3685 | |
2bd7c093 | 3686 | if (lwp->resume == NULL) |
bd99dc85 | 3687 | return 0; |
5544ad89 | 3688 | |
bd99dc85 | 3689 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3690 | { |
bd99dc85 | 3691 | if (debug_threads) |
d50171e4 | 3692 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3693 | |
3694 | if (!lwp->stopped) | |
3695 | { | |
3696 | if (debug_threads) | |
d50171e4 | 3697 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3698 | |
d50171e4 PA |
3699 | /* Stop the thread, and wait for the event asynchronously, |
3700 | through the event loop. */ | |
02fc4de7 | 3701 | send_sigstop (lwp); |
bd99dc85 PA |
3702 | } |
3703 | else | |
3704 | { | |
3705 | if (debug_threads) | |
d50171e4 PA |
3706 | fprintf (stderr, "already stopped LWP %ld\n", |
3707 | lwpid_of (lwp)); | |
3708 | ||
3709 | /* The LWP may have been stopped in an internal event that | |
3710 | was not meant to be notified back to GDB (e.g., gdbserver | |
3711 | breakpoint), so we should be reporting a stop event in | |
3712 | this case too. */ | |
3713 | ||
3714 | /* If the thread already has a pending SIGSTOP, this is a | |
3715 | no-op. Otherwise, something later will presumably resume | |
3716 | the thread and this will cause it to cancel any pending | |
3717 | operation, due to last_resume_kind == resume_stop. If | |
3718 | the thread already has a pending status to report, we | |
3719 | will still report it the next time we wait - see | |
3720 | status_pending_p_callback. */ | |
1a981360 PA |
3721 | |
3722 | /* If we already have a pending signal to report, then | |
3723 | there's no need to queue a SIGSTOP, as this means we're | |
3724 | midway through moving the LWP out of the jumppad, and we | |
3725 | will report the pending signal as soon as that is | |
3726 | finished. */ | |
3727 | if (lwp->pending_signals_to_report == NULL) | |
3728 | send_sigstop (lwp); | |
bd99dc85 | 3729 | } |
32ca6d61 | 3730 | |
bd99dc85 PA |
3731 | /* For stop requests, we're done. */ |
3732 | lwp->resume = NULL; | |
fc7238bb | 3733 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3734 | return 0; |
5544ad89 DJ |
3735 | } |
3736 | ||
bd99dc85 PA |
3737 | /* If this thread which is about to be resumed has a pending status, |
3738 | then don't resume any threads - we can just report the pending | |
3739 | status. Make sure to queue any signals that would otherwise be | |
3740 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3741 | thread has a pending status. If there's a thread that needs the |
3742 | step-over-breakpoint dance, then don't resume any other thread | |
3743 | but that particular one. */ | |
3744 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3745 | |
d50171e4 | 3746 | if (!leave_pending) |
bd99dc85 PA |
3747 | { |
3748 | if (debug_threads) | |
3749 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3750 | |
d50171e4 | 3751 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3752 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3753 | } |
3754 | else | |
3755 | { | |
3756 | if (debug_threads) | |
3757 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3758 | |
bd99dc85 PA |
3759 | /* If we have a new signal, enqueue the signal. */ |
3760 | if (lwp->resume->sig != 0) | |
3761 | { | |
3762 | struct pending_signals *p_sig; | |
3763 | p_sig = xmalloc (sizeof (*p_sig)); | |
3764 | p_sig->prev = lwp->pending_signals; | |
3765 | p_sig->signal = lwp->resume->sig; | |
3766 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3767 | ||
3768 | /* If this is the same signal we were previously stopped by, | |
3769 | make sure to queue its siginfo. We can ignore the return | |
3770 | value of ptrace; if it fails, we'll skip | |
3771 | PTRACE_SETSIGINFO. */ | |
3772 | if (WIFSTOPPED (lwp->last_status) | |
3773 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
56f7af9c MS |
3774 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
3775 | &p_sig->info); | |
bd99dc85 PA |
3776 | |
3777 | lwp->pending_signals = p_sig; | |
3778 | } | |
3779 | } | |
5544ad89 | 3780 | |
fc7238bb | 3781 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3782 | lwp->resume = NULL; |
5544ad89 | 3783 | return 0; |
0d62e5e8 DJ |
3784 | } |
3785 | ||
3786 | static void | |
2bd7c093 | 3787 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3788 | { |
2bd7c093 | 3789 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3790 | struct lwp_info *need_step_over = NULL; |
3791 | int any_pending; | |
3792 | int leave_all_stopped; | |
c6ecbae5 | 3793 | |
2bd7c093 | 3794 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3795 | |
d50171e4 PA |
3796 | /* If there is a thread which would otherwise be resumed, which has |
3797 | a pending status, then don't resume any threads - we can just | |
3798 | report the pending status. Make sure to queue any signals that | |
3799 | would otherwise be sent. In non-stop mode, we'll apply this | |
3800 | logic to each thread individually. We consume all pending events | |
3801 | before considering to start a step-over (in all-stop). */ | |
3802 | any_pending = 0; | |
bd99dc85 | 3803 | if (!non_stop) |
d50171e4 PA |
3804 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3805 | ||
3806 | /* If there is a thread which would otherwise be resumed, which is | |
3807 | stopped at a breakpoint that needs stepping over, then don't | |
3808 | resume any threads - have it step over the breakpoint with all | |
3809 | other threads stopped, then resume all threads again. Make sure | |
3810 | to queue any signals that would otherwise be delivered or | |
3811 | queued. */ | |
3812 | if (!any_pending && supports_breakpoints ()) | |
3813 | need_step_over | |
3814 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3815 | need_step_over_p, NULL); | |
3816 | ||
3817 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3818 | ||
3819 | if (debug_threads) | |
3820 | { | |
3821 | if (need_step_over != NULL) | |
3822 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3823 | else if (any_pending) | |
3824 | fprintf (stderr, | |
3825 | "Not resuming, all-stop and found " | |
3826 | "an LWP with pending status\n"); | |
3827 | else | |
3828 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3829 | } | |
3830 | ||
3831 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3832 | otherwise deliver. */ | |
3833 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3834 | ||
3835 | if (need_step_over) | |
3836 | start_step_over (need_step_over); | |
3837 | } | |
3838 | ||
3839 | /* This function is called once per thread. We check the thread's | |
3840 | last resume request, which will tell us whether to resume, step, or | |
3841 | leave the thread stopped. Any signal the client requested to be | |
3842 | delivered has already been enqueued at this point. | |
3843 | ||
3844 | If any thread that GDB wants running is stopped at an internal | |
3845 | breakpoint that needs stepping over, we start a step-over operation | |
3846 | on that particular thread, and leave all others stopped. */ | |
3847 | ||
7984d532 PA |
3848 | static int |
3849 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3850 | { |
7984d532 | 3851 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3852 | struct thread_info *thread; |
d50171e4 PA |
3853 | int step; |
3854 | ||
7984d532 PA |
3855 | if (lwp == except) |
3856 | return 0; | |
d50171e4 PA |
3857 | |
3858 | if (debug_threads) | |
3859 | fprintf (stderr, | |
3860 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3861 | ||
3862 | if (!lwp->stopped) | |
3863 | { | |
3864 | if (debug_threads) | |
3865 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3866 | return 0; |
d50171e4 PA |
3867 | } |
3868 | ||
8336d594 PA |
3869 | thread = get_lwp_thread (lwp); |
3870 | ||
02fc4de7 PA |
3871 | if (thread->last_resume_kind == resume_stop |
3872 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3873 | { |
3874 | if (debug_threads) | |
02fc4de7 PA |
3875 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3876 | lwpid_of (lwp)); | |
7984d532 | 3877 | return 0; |
d50171e4 PA |
3878 | } |
3879 | ||
3880 | if (lwp->status_pending_p) | |
3881 | { | |
3882 | if (debug_threads) | |
3883 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3884 | lwpid_of (lwp)); | |
7984d532 | 3885 | return 0; |
d50171e4 PA |
3886 | } |
3887 | ||
7984d532 PA |
3888 | gdb_assert (lwp->suspended >= 0); |
3889 | ||
d50171e4 PA |
3890 | if (lwp->suspended) |
3891 | { | |
3892 | if (debug_threads) | |
3893 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3894 | return 0; |
d50171e4 PA |
3895 | } |
3896 | ||
1a981360 PA |
3897 | if (thread->last_resume_kind == resume_stop |
3898 | && lwp->pending_signals_to_report == NULL | |
3899 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3900 | { |
3901 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3902 | last_status.kind check above would catch it, and we wouldn't | |
3903 | reach here. This LWP may have been momentarily paused by a | |
3904 | stop_all_lwps call while handling for example, another LWP's | |
3905 | step-over. In that case, the pending expected SIGSTOP signal | |
3906 | that was queued at vCont;t handling time will have already | |
3907 | been consumed by wait_for_sigstop, and so we need to requeue | |
3908 | another one here. Note that if the LWP already has a SIGSTOP | |
3909 | pending, this is a no-op. */ | |
3910 | ||
3911 | if (debug_threads) | |
3912 | fprintf (stderr, | |
3913 | "Client wants LWP %ld to stop. " | |
3914 | "Making sure it has a SIGSTOP pending\n", | |
3915 | lwpid_of (lwp)); | |
3916 | ||
3917 | send_sigstop (lwp); | |
3918 | } | |
3919 | ||
8336d594 | 3920 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3921 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3922 | return 0; |
3923 | } | |
3924 | ||
3925 | static int | |
3926 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3927 | { | |
3928 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3929 | ||
3930 | if (lwp == except) | |
3931 | return 0; | |
3932 | ||
3933 | lwp->suspended--; | |
3934 | gdb_assert (lwp->suspended >= 0); | |
3935 | ||
3936 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3937 | } |
3938 | ||
3939 | /* When we finish a step-over, set threads running again. If there's | |
3940 | another thread that may need a step-over, now's the time to start | |
3941 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3942 | ||
3943 | static void | |
3944 | proceed_all_lwps (void) | |
3945 | { | |
3946 | struct lwp_info *need_step_over; | |
3947 | ||
3948 | /* If there is a thread which would otherwise be resumed, which is | |
3949 | stopped at a breakpoint that needs stepping over, then don't | |
3950 | resume any threads - have it step over the breakpoint with all | |
3951 | other threads stopped, then resume all threads again. */ | |
3952 | ||
3953 | if (supports_breakpoints ()) | |
3954 | { | |
3955 | need_step_over | |
3956 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3957 | need_step_over_p, NULL); | |
3958 | ||
3959 | if (need_step_over != NULL) | |
3960 | { | |
3961 | if (debug_threads) | |
3962 | fprintf (stderr, "proceed_all_lwps: found " | |
3963 | "thread %ld needing a step-over\n", | |
3964 | lwpid_of (need_step_over)); | |
3965 | ||
3966 | start_step_over (need_step_over); | |
3967 | return; | |
3968 | } | |
3969 | } | |
5544ad89 | 3970 | |
d50171e4 PA |
3971 | if (debug_threads) |
3972 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3973 | ||
7984d532 | 3974 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3975 | } |
3976 | ||
3977 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3978 | pending statuses, are set to run again, except for EXCEPT, if not | |
3979 | NULL. This undoes a stop_all_lwps call. */ | |
3980 | ||
3981 | static void | |
7984d532 | 3982 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3983 | { |
5544ad89 DJ |
3984 | if (debug_threads) |
3985 | { | |
d50171e4 PA |
3986 | if (except) |
3987 | fprintf (stderr, | |
3988 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3989 | else |
d50171e4 PA |
3990 | fprintf (stderr, |
3991 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3992 | } |
3993 | ||
7984d532 PA |
3994 | if (unsuspend) |
3995 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3996 | else | |
3997 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3998 | } |
3999 | ||
58caa3dc DJ |
4000 | |
4001 | #ifdef HAVE_LINUX_REGSETS | |
4002 | ||
1faeff08 MR |
4003 | #define use_linux_regsets 1 |
4004 | ||
58caa3dc | 4005 | static int |
442ea881 | 4006 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
4007 | { |
4008 | struct regset_info *regset; | |
e9d25b98 | 4009 | int saw_general_regs = 0; |
95954743 | 4010 | int pid; |
1570b33e | 4011 | struct iovec iov; |
58caa3dc DJ |
4012 | |
4013 | regset = target_regsets; | |
4014 | ||
95954743 | 4015 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4016 | while (regset->size >= 0) |
4017 | { | |
1570b33e L |
4018 | void *buf, *data; |
4019 | int nt_type, res; | |
58caa3dc | 4020 | |
52fa2412 | 4021 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
4022 | { |
4023 | regset ++; | |
4024 | continue; | |
4025 | } | |
4026 | ||
bca929d3 | 4027 | buf = xmalloc (regset->size); |
1570b33e L |
4028 | |
4029 | nt_type = regset->nt_type; | |
4030 | if (nt_type) | |
4031 | { | |
4032 | iov.iov_base = buf; | |
4033 | iov.iov_len = regset->size; | |
4034 | data = (void *) &iov; | |
4035 | } | |
4036 | else | |
4037 | data = buf; | |
4038 | ||
dfb64f85 | 4039 | #ifndef __sparc__ |
f15f9948 TJB |
4040 | res = ptrace (regset->get_request, pid, |
4041 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4042 | #else |
1570b33e | 4043 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4044 | #endif |
58caa3dc DJ |
4045 | if (res < 0) |
4046 | { | |
4047 | if (errno == EIO) | |
4048 | { | |
52fa2412 UW |
4049 | /* If we get EIO on a regset, do not try it again for |
4050 | this process. */ | |
4051 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 4052 | free (buf); |
52fa2412 | 4053 | continue; |
58caa3dc DJ |
4054 | } |
4055 | else | |
4056 | { | |
0d62e5e8 | 4057 | char s[256]; |
95954743 PA |
4058 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4059 | pid); | |
0d62e5e8 | 4060 | perror (s); |
58caa3dc DJ |
4061 | } |
4062 | } | |
e9d25b98 DJ |
4063 | else if (regset->type == GENERAL_REGS) |
4064 | saw_general_regs = 1; | |
442ea881 | 4065 | regset->store_function (regcache, buf); |
58caa3dc | 4066 | regset ++; |
fdeb2a12 | 4067 | free (buf); |
58caa3dc | 4068 | } |
e9d25b98 DJ |
4069 | if (saw_general_regs) |
4070 | return 0; | |
4071 | else | |
4072 | return 1; | |
58caa3dc DJ |
4073 | } |
4074 | ||
4075 | static int | |
442ea881 | 4076 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
4077 | { |
4078 | struct regset_info *regset; | |
e9d25b98 | 4079 | int saw_general_regs = 0; |
95954743 | 4080 | int pid; |
1570b33e | 4081 | struct iovec iov; |
58caa3dc DJ |
4082 | |
4083 | regset = target_regsets; | |
4084 | ||
95954743 | 4085 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4086 | while (regset->size >= 0) |
4087 | { | |
1570b33e L |
4088 | void *buf, *data; |
4089 | int nt_type, res; | |
58caa3dc | 4090 | |
52fa2412 | 4091 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
4092 | { |
4093 | regset ++; | |
4094 | continue; | |
4095 | } | |
4096 | ||
bca929d3 | 4097 | buf = xmalloc (regset->size); |
545587ee DJ |
4098 | |
4099 | /* First fill the buffer with the current register set contents, | |
4100 | in case there are any items in the kernel's regset that are | |
4101 | not in gdbserver's regcache. */ | |
1570b33e L |
4102 | |
4103 | nt_type = regset->nt_type; | |
4104 | if (nt_type) | |
4105 | { | |
4106 | iov.iov_base = buf; | |
4107 | iov.iov_len = regset->size; | |
4108 | data = (void *) &iov; | |
4109 | } | |
4110 | else | |
4111 | data = buf; | |
4112 | ||
dfb64f85 | 4113 | #ifndef __sparc__ |
f15f9948 TJB |
4114 | res = ptrace (regset->get_request, pid, |
4115 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4116 | #else |
689cc2ae | 4117 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4118 | #endif |
545587ee DJ |
4119 | |
4120 | if (res == 0) | |
4121 | { | |
4122 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4123 | regset->fill_function (regcache, buf); |
545587ee DJ |
4124 | |
4125 | /* Only now do we write the register set. */ | |
dfb64f85 | 4126 | #ifndef __sparc__ |
f15f9948 TJB |
4127 | res = ptrace (regset->set_request, pid, |
4128 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4129 | #else |
1570b33e | 4130 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4131 | #endif |
545587ee DJ |
4132 | } |
4133 | ||
58caa3dc DJ |
4134 | if (res < 0) |
4135 | { | |
4136 | if (errno == EIO) | |
4137 | { | |
52fa2412 UW |
4138 | /* If we get EIO on a regset, do not try it again for |
4139 | this process. */ | |
4140 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 4141 | free (buf); |
52fa2412 | 4142 | continue; |
58caa3dc | 4143 | } |
3221518c UW |
4144 | else if (errno == ESRCH) |
4145 | { | |
1b3f6016 PA |
4146 | /* At this point, ESRCH should mean the process is |
4147 | already gone, in which case we simply ignore attempts | |
4148 | to change its registers. See also the related | |
4149 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4150 | free (buf); |
3221518c UW |
4151 | return 0; |
4152 | } | |
58caa3dc DJ |
4153 | else |
4154 | { | |
ce3a066d | 4155 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4156 | } |
4157 | } | |
e9d25b98 DJ |
4158 | else if (regset->type == GENERAL_REGS) |
4159 | saw_general_regs = 1; | |
58caa3dc | 4160 | regset ++; |
09ec9b38 | 4161 | free (buf); |
58caa3dc | 4162 | } |
e9d25b98 DJ |
4163 | if (saw_general_regs) |
4164 | return 0; | |
4165 | else | |
4166 | return 1; | |
58caa3dc DJ |
4167 | } |
4168 | ||
1faeff08 | 4169 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4170 | |
1faeff08 MR |
4171 | #define use_linux_regsets 0 |
4172 | #define regsets_fetch_inferior_registers(regcache) 1 | |
4173 | #define regsets_store_inferior_registers(regcache) 1 | |
58caa3dc | 4174 | |
58caa3dc | 4175 | #endif |
1faeff08 MR |
4176 | |
4177 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4178 | calls or 0 if it has to be transferred individually. */ | |
4179 | ||
4180 | static int | |
4181 | linux_register_in_regsets (int regno) | |
4182 | { | |
4183 | unsigned char mask = 1 << (regno % 8); | |
4184 | size_t index = regno / 8; | |
4185 | ||
4186 | return (use_linux_regsets | |
4187 | && (the_low_target.regset_bitmap == NULL | |
4188 | || (the_low_target.regset_bitmap[index] & mask) != 0)); | |
4189 | } | |
4190 | ||
58caa3dc | 4191 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4192 | |
4193 | int | |
4194 | register_addr (int regnum) | |
4195 | { | |
4196 | int addr; | |
4197 | ||
4198 | if (regnum < 0 || regnum >= the_low_target.num_regs) | |
4199 | error ("Invalid register number %d.", regnum); | |
4200 | ||
4201 | addr = the_low_target.regmap[regnum]; | |
4202 | ||
4203 | return addr; | |
4204 | } | |
4205 | ||
4206 | /* Fetch one register. */ | |
4207 | static void | |
4208 | fetch_register (struct regcache *regcache, int regno) | |
4209 | { | |
4210 | CORE_ADDR regaddr; | |
4211 | int i, size; | |
4212 | char *buf; | |
4213 | int pid; | |
4214 | ||
4215 | if (regno >= the_low_target.num_regs) | |
4216 | return; | |
4217 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4218 | return; | |
4219 | ||
4220 | regaddr = register_addr (regno); | |
4221 | if (regaddr == -1) | |
4222 | return; | |
4223 | ||
4224 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4225 | & -sizeof (PTRACE_XFER_TYPE)); | |
4226 | buf = alloca (size); | |
4227 | ||
4228 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4229 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4230 | { | |
4231 | errno = 0; | |
4232 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4233 | ptrace (PTRACE_PEEKUSER, pid, | |
4234 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4235 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
56f7af9c | 4236 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, (PTRACE_ARG4_TYPE) 0); |
1faeff08 MR |
4237 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4238 | if (errno != 0) | |
4239 | error ("reading register %d: %s", regno, strerror (errno)); | |
4240 | } | |
4241 | ||
4242 | if (the_low_target.supply_ptrace_register) | |
4243 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4244 | else | |
4245 | supply_register (regcache, regno, buf); | |
4246 | } | |
4247 | ||
4248 | /* Store one register. */ | |
4249 | static void | |
4250 | store_register (struct regcache *regcache, int regno) | |
4251 | { | |
4252 | CORE_ADDR regaddr; | |
4253 | int i, size; | |
4254 | char *buf; | |
4255 | int pid; | |
4256 | ||
4257 | if (regno >= the_low_target.num_regs) | |
4258 | return; | |
4259 | if ((*the_low_target.cannot_store_register) (regno)) | |
4260 | return; | |
4261 | ||
4262 | regaddr = register_addr (regno); | |
4263 | if (regaddr == -1) | |
4264 | return; | |
4265 | ||
4266 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4267 | & -sizeof (PTRACE_XFER_TYPE)); | |
4268 | buf = alloca (size); | |
4269 | memset (buf, 0, size); | |
4270 | ||
4271 | if (the_low_target.collect_ptrace_register) | |
4272 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4273 | else | |
4274 | collect_register (regcache, regno, buf); | |
4275 | ||
4276 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4277 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4278 | { | |
4279 | errno = 0; | |
4280 | ptrace (PTRACE_POKEUSER, pid, | |
4281 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4282 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4283 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
4284 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
4285 | if (errno != 0) | |
4286 | { | |
4287 | /* At this point, ESRCH should mean the process is | |
4288 | already gone, in which case we simply ignore attempts | |
4289 | to change its registers. See also the related | |
4290 | comment in linux_resume_one_lwp. */ | |
4291 | if (errno == ESRCH) | |
4292 | return; | |
4293 | ||
4294 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4295 | error ("writing register %d: %s", regno, strerror (errno)); | |
4296 | } | |
4297 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4298 | } | |
4299 | } | |
4300 | ||
4301 | /* Fetch all registers, or just one, from the child process. | |
4302 | If REGNO is -1, do this for all registers, skipping any that are | |
4303 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4304 | unless ALL is non-zero. | |
4305 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4306 | static void | |
4307 | usr_fetch_inferior_registers (struct regcache *regcache, int regno, int all) | |
4308 | { | |
4309 | if (regno == -1) | |
4310 | { | |
4311 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4312 | if (all || !linux_register_in_regsets (regno)) | |
4313 | fetch_register (regcache, regno); | |
4314 | } | |
4315 | else | |
4316 | fetch_register (regcache, regno); | |
4317 | } | |
4318 | ||
4319 | /* Store our register values back into the inferior. | |
4320 | If REGNO is -1, do this for all registers, skipping any that are | |
4321 | assumed to have been saved by regsets_store_inferior_registers, | |
4322 | unless ALL is non-zero. | |
4323 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4324 | static void | |
4325 | usr_store_inferior_registers (struct regcache *regcache, int regno, int all) | |
4326 | { | |
4327 | if (regno == -1) | |
4328 | { | |
4329 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4330 | if (all || !linux_register_in_regsets (regno)) | |
4331 | store_register (regcache, regno); | |
4332 | } | |
4333 | else | |
4334 | store_register (regcache, regno); | |
4335 | } | |
4336 | ||
4337 | #else /* !HAVE_LINUX_USRREGS */ | |
4338 | ||
4339 | #define usr_fetch_inferior_registers(regcache, regno, all) do {} while (0) | |
4340 | #define usr_store_inferior_registers(regcache, regno, all) do {} while (0) | |
4341 | ||
58caa3dc | 4342 | #endif |
1faeff08 MR |
4343 | |
4344 | ||
4345 | void | |
4346 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4347 | { | |
4348 | int use_regsets; | |
4349 | int all = 0; | |
4350 | ||
4351 | if (regno == -1) | |
4352 | { | |
c14dfd32 PA |
4353 | if (the_low_target.fetch_register != NULL) |
4354 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4355 | (*the_low_target.fetch_register) (regcache, regno); | |
4356 | ||
1faeff08 | 4357 | all = regsets_fetch_inferior_registers (regcache); |
c14dfd32 | 4358 | usr_fetch_inferior_registers (regcache, -1, all); |
1faeff08 MR |
4359 | } |
4360 | else | |
4361 | { | |
c14dfd32 PA |
4362 | if (the_low_target.fetch_register != NULL |
4363 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4364 | return; | |
4365 | ||
1faeff08 MR |
4366 | use_regsets = linux_register_in_regsets (regno); |
4367 | if (use_regsets) | |
4368 | all = regsets_fetch_inferior_registers (regcache); | |
4369 | if (!use_regsets || all) | |
4370 | usr_fetch_inferior_registers (regcache, regno, 1); | |
4371 | } | |
58caa3dc DJ |
4372 | } |
4373 | ||
4374 | void | |
442ea881 | 4375 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4376 | { |
1faeff08 MR |
4377 | int use_regsets; |
4378 | int all = 0; | |
4379 | ||
4380 | if (regno == -1) | |
4381 | { | |
4382 | all = regsets_store_inferior_registers (regcache); | |
4383 | usr_store_inferior_registers (regcache, regno, all); | |
4384 | } | |
4385 | else | |
4386 | { | |
4387 | use_regsets = linux_register_in_regsets (regno); | |
4388 | if (use_regsets) | |
4389 | all = regsets_store_inferior_registers (regcache); | |
4390 | if (!use_regsets || all) | |
4391 | usr_store_inferior_registers (regcache, regno, 1); | |
4392 | } | |
58caa3dc DJ |
4393 | } |
4394 | ||
da6d8c04 | 4395 | |
da6d8c04 DJ |
4396 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4397 | to debugger memory starting at MYADDR. */ | |
4398 | ||
c3e735a6 | 4399 | static int |
f450004a | 4400 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4401 | { |
4934b29e MR |
4402 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
4403 | register PTRACE_XFER_TYPE *buffer; | |
4404 | register CORE_ADDR addr; | |
4405 | register int count; | |
4406 | char filename[64]; | |
da6d8c04 | 4407 | register int i; |
4934b29e | 4408 | int ret; |
fd462a61 | 4409 | int fd; |
fd462a61 DJ |
4410 | |
4411 | /* Try using /proc. Don't bother for one word. */ | |
4412 | if (len >= 3 * sizeof (long)) | |
4413 | { | |
4934b29e MR |
4414 | int bytes; |
4415 | ||
fd462a61 DJ |
4416 | /* We could keep this file open and cache it - possibly one per |
4417 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4418 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4419 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4420 | if (fd == -1) | |
4421 | goto no_proc; | |
4422 | ||
4423 | /* If pread64 is available, use it. It's faster if the kernel | |
4424 | supports it (only one syscall), and it's 64-bit safe even on | |
4425 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4426 | application). */ | |
4427 | #ifdef HAVE_PREAD64 | |
4934b29e | 4428 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4429 | #else |
4934b29e MR |
4430 | bytes = -1; |
4431 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4432 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4433 | #endif |
fd462a61 DJ |
4434 | |
4435 | close (fd); | |
4934b29e MR |
4436 | if (bytes == len) |
4437 | return 0; | |
4438 | ||
4439 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4440 | if (bytes > 0) | |
4441 | { | |
4442 | memaddr += bytes; | |
4443 | myaddr += bytes; | |
4444 | len -= bytes; | |
4445 | } | |
fd462a61 | 4446 | } |
da6d8c04 | 4447 | |
fd462a61 | 4448 | no_proc: |
4934b29e MR |
4449 | /* Round starting address down to longword boundary. */ |
4450 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4451 | /* Round ending address up; get number of longwords that makes. */ | |
4452 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4453 | / sizeof (PTRACE_XFER_TYPE)); | |
4454 | /* Allocate buffer of that many longwords. */ | |
4455 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4456 | ||
da6d8c04 | 4457 | /* Read all the longwords */ |
4934b29e | 4458 | errno = 0; |
da6d8c04 DJ |
4459 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4460 | { | |
14ce3065 DE |
4461 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4462 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4463 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
56f7af9c MS |
4464 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, |
4465 | (PTRACE_ARG4_TYPE) 0); | |
c3e735a6 | 4466 | if (errno) |
4934b29e | 4467 | break; |
da6d8c04 | 4468 | } |
4934b29e | 4469 | ret = errno; |
da6d8c04 DJ |
4470 | |
4471 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4472 | if (i > 0) |
4473 | { | |
4474 | i *= sizeof (PTRACE_XFER_TYPE); | |
4475 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4476 | memcpy (myaddr, | |
4477 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4478 | i < len ? i : len); | |
4479 | } | |
c3e735a6 | 4480 | |
4934b29e | 4481 | return ret; |
da6d8c04 DJ |
4482 | } |
4483 | ||
93ae6fdc PA |
4484 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4485 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4486 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4487 | |
ce3a066d | 4488 | static int |
f450004a | 4489 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4490 | { |
4491 | register int i; | |
4492 | /* Round starting address down to longword boundary. */ | |
4493 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4494 | /* Round ending address up; get number of longwords that makes. */ | |
4495 | register int count | |
493e2a69 MS |
4496 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4497 | / sizeof (PTRACE_XFER_TYPE); | |
4498 | ||
da6d8c04 | 4499 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4500 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4501 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4502 | ||
95954743 | 4503 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4504 | |
f0ae6fc3 PA |
4505 | if (len == 0) |
4506 | { | |
4507 | /* Zero length write always succeeds. */ | |
4508 | return 0; | |
4509 | } | |
4510 | ||
0d62e5e8 DJ |
4511 | if (debug_threads) |
4512 | { | |
58d6951d DJ |
4513 | /* Dump up to four bytes. */ |
4514 | unsigned int val = * (unsigned int *) myaddr; | |
4515 | if (len == 1) | |
4516 | val = val & 0xff; | |
4517 | else if (len == 2) | |
4518 | val = val & 0xffff; | |
4519 | else if (len == 3) | |
4520 | val = val & 0xffffff; | |
4521 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4522 | val, (long)memaddr); | |
0d62e5e8 DJ |
4523 | } |
4524 | ||
da6d8c04 DJ |
4525 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4526 | ||
93ae6fdc | 4527 | errno = 0; |
14ce3065 DE |
4528 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4529 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4530 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
56f7af9c MS |
4531 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, |
4532 | (PTRACE_ARG4_TYPE) 0); | |
93ae6fdc PA |
4533 | if (errno) |
4534 | return errno; | |
da6d8c04 DJ |
4535 | |
4536 | if (count > 1) | |
4537 | { | |
93ae6fdc | 4538 | errno = 0; |
da6d8c04 | 4539 | buffer[count - 1] |
95954743 | 4540 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4541 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4542 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4543 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4544 | * sizeof (PTRACE_XFER_TYPE)), | |
56f7af9c | 4545 | (PTRACE_ARG4_TYPE) 0); |
93ae6fdc PA |
4546 | if (errno) |
4547 | return errno; | |
da6d8c04 DJ |
4548 | } |
4549 | ||
93ae6fdc | 4550 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4551 | |
493e2a69 MS |
4552 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4553 | myaddr, len); | |
da6d8c04 DJ |
4554 | |
4555 | /* Write the entire buffer. */ | |
4556 | ||
4557 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4558 | { | |
4559 | errno = 0; | |
14ce3065 DE |
4560 | ptrace (PTRACE_POKETEXT, pid, |
4561 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4562 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4563 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4564 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4565 | if (errno) |
4566 | return errno; | |
4567 | } | |
4568 | ||
4569 | return 0; | |
4570 | } | |
2f2893d9 | 4571 | |
6076632b | 4572 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4573 | static int linux_supports_tracefork_flag; |
4574 | ||
1e7fc18c PA |
4575 | static void |
4576 | linux_enable_event_reporting (int pid) | |
4577 | { | |
4578 | if (!linux_supports_tracefork_flag) | |
4579 | return; | |
4580 | ||
56f7af9c MS |
4581 | ptrace (PTRACE_SETOPTIONS, pid, (PTRACE_ARG3_TYPE) 0, |
4582 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
1e7fc18c PA |
4583 | } |
4584 | ||
51c2684e | 4585 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4586 | |
51c2684e DJ |
4587 | static int |
4588 | linux_tracefork_grandchild (void *arg) | |
4589 | { | |
4590 | _exit (0); | |
4591 | } | |
4592 | ||
7407e2de AS |
4593 | #define STACK_SIZE 4096 |
4594 | ||
51c2684e DJ |
4595 | static int |
4596 | linux_tracefork_child (void *arg) | |
24a09b5f | 4597 | { |
56f7af9c | 4598 | ptrace (PTRACE_TRACEME, 0, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
24a09b5f | 4599 | kill (getpid (), SIGSTOP); |
e4b7f41c JK |
4600 | |
4601 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4602 | ||
4603 | if (fork () == 0) | |
4604 | linux_tracefork_grandchild (NULL); | |
4605 | ||
4606 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4607 | ||
7407e2de AS |
4608 | #ifdef __ia64__ |
4609 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4610 | CLONE_VM | SIGCHLD, NULL); | |
4611 | #else | |
a1f2ce7d | 4612 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4613 | CLONE_VM | SIGCHLD, NULL); |
4614 | #endif | |
e4b7f41c JK |
4615 | |
4616 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4617 | ||
24a09b5f DJ |
4618 | _exit (0); |
4619 | } | |
4620 | ||
24a09b5f DJ |
4621 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4622 | sure that we can enable the option, and that it had the desired | |
4623 | effect. */ | |
4624 | ||
4625 | static void | |
4626 | linux_test_for_tracefork (void) | |
4627 | { | |
4628 | int child_pid, ret, status; | |
4629 | long second_pid; | |
e4b7f41c | 4630 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4631 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4632 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4633 | |
4634 | linux_supports_tracefork_flag = 0; | |
4635 | ||
e4b7f41c JK |
4636 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4637 | ||
4638 | child_pid = fork (); | |
4639 | if (child_pid == 0) | |
4640 | linux_tracefork_child (NULL); | |
4641 | ||
4642 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4643 | ||
51c2684e | 4644 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4645 | #ifdef __ia64__ |
4646 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4647 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4648 | #else /* !__ia64__ */ |
7407e2de AS |
4649 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4650 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4651 | #endif /* !__ia64__ */ |
4652 | ||
4653 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4654 | ||
24a09b5f | 4655 | if (child_pid == -1) |
51c2684e | 4656 | perror_with_name ("clone"); |
24a09b5f DJ |
4657 | |
4658 | ret = my_waitpid (child_pid, &status, 0); | |
4659 | if (ret == -1) | |
4660 | perror_with_name ("waitpid"); | |
4661 | else if (ret != child_pid) | |
4662 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4663 | if (! WIFSTOPPED (status)) | |
4664 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4665 | ||
56f7af9c | 4666 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, (PTRACE_ARG3_TYPE) 0, |
14ce3065 | 4667 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); |
24a09b5f DJ |
4668 | if (ret != 0) |
4669 | { | |
56f7af9c MS |
4670 | ret = ptrace (PTRACE_KILL, child_pid, (PTRACE_ARG3_TYPE) 0, |
4671 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4672 | if (ret != 0) |
4673 | { | |
4674 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4675 | return; | |
4676 | } | |
4677 | ||
4678 | ret = my_waitpid (child_pid, &status, 0); | |
4679 | if (ret != child_pid) | |
4680 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4681 | else if (!WIFSIGNALED (status)) | |
4682 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4683 | "killed child", status); | |
4684 | ||
4685 | return; | |
4686 | } | |
4687 | ||
56f7af9c MS |
4688 | ret = ptrace (PTRACE_CONT, child_pid, (PTRACE_ARG3_TYPE) 0, |
4689 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4690 | if (ret != 0) |
4691 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4692 | ||
4693 | ret = my_waitpid (child_pid, &status, 0); | |
4694 | ||
4695 | if (ret == child_pid && WIFSTOPPED (status) | |
4696 | && status >> 16 == PTRACE_EVENT_FORK) | |
4697 | { | |
4698 | second_pid = 0; | |
56f7af9c MS |
4699 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, (PTRACE_ARG3_TYPE) 0, |
4700 | &second_pid); | |
24a09b5f DJ |
4701 | if (ret == 0 && second_pid != 0) |
4702 | { | |
4703 | int second_status; | |
4704 | ||
4705 | linux_supports_tracefork_flag = 1; | |
4706 | my_waitpid (second_pid, &second_status, 0); | |
56f7af9c MS |
4707 | ret = ptrace (PTRACE_KILL, second_pid, (PTRACE_ARG3_TYPE) 0, |
4708 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4709 | if (ret != 0) |
4710 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4711 | my_waitpid (second_pid, &status, 0); | |
4712 | } | |
4713 | } | |
4714 | else | |
4715 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4716 | "(%d, status 0x%x)", ret, status); | |
4717 | ||
4718 | do | |
4719 | { | |
56f7af9c MS |
4720 | ret = ptrace (PTRACE_KILL, child_pid, (PTRACE_ARG3_TYPE) 0, |
4721 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4722 | if (ret != 0) |
4723 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4724 | my_waitpid (child_pid, &status, 0); | |
4725 | } | |
4726 | while (WIFSTOPPED (status)); | |
51c2684e | 4727 | |
e4b7f41c | 4728 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4729 | free (stack); |
e4b7f41c | 4730 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4731 | } |
4732 | ||
4733 | ||
2f2893d9 DJ |
4734 | static void |
4735 | linux_look_up_symbols (void) | |
4736 | { | |
0d62e5e8 | 4737 | #ifdef USE_THREAD_DB |
95954743 PA |
4738 | struct process_info *proc = current_process (); |
4739 | ||
cdbfd419 | 4740 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4741 | return; |
4742 | ||
6076632b DE |
4743 | /* If the kernel supports tracing forks then it also supports tracing |
4744 | clones, and then we don't need to use the magic thread event breakpoint | |
4745 | to learn about threads. */ | |
cdbfd419 | 4746 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4747 | #endif |
4748 | } | |
4749 | ||
e5379b03 | 4750 | static void |
ef57601b | 4751 | linux_request_interrupt (void) |
e5379b03 | 4752 | { |
a1928bad | 4753 | extern unsigned long signal_pid; |
e5379b03 | 4754 | |
95954743 PA |
4755 | if (!ptid_equal (cont_thread, null_ptid) |
4756 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4757 | { |
54a0b537 | 4758 | struct lwp_info *lwp; |
bd99dc85 | 4759 | int lwpid; |
e5379b03 | 4760 | |
54a0b537 | 4761 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4762 | lwpid = lwpid_of (lwp); |
4763 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4764 | } |
4765 | else | |
ef57601b | 4766 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4767 | } |
4768 | ||
aa691b87 RM |
4769 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4770 | to debugger memory starting at MYADDR. */ | |
4771 | ||
4772 | static int | |
f450004a | 4773 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4774 | { |
4775 | char filename[PATH_MAX]; | |
4776 | int fd, n; | |
95954743 | 4777 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4778 | |
6cebaf6e | 4779 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4780 | |
4781 | fd = open (filename, O_RDONLY); | |
4782 | if (fd < 0) | |
4783 | return -1; | |
4784 | ||
4785 | if (offset != (CORE_ADDR) 0 | |
4786 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4787 | n = -1; | |
4788 | else | |
4789 | n = read (fd, myaddr, len); | |
4790 | ||
4791 | close (fd); | |
4792 | ||
4793 | return n; | |
4794 | } | |
4795 | ||
d993e290 PA |
4796 | /* These breakpoint and watchpoint related wrapper functions simply |
4797 | pass on the function call if the target has registered a | |
4798 | corresponding function. */ | |
e013ee27 OF |
4799 | |
4800 | static int | |
d993e290 | 4801 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4802 | { |
d993e290 PA |
4803 | if (the_low_target.insert_point != NULL) |
4804 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4805 | else |
4806 | /* Unsupported (see target.h). */ | |
4807 | return 1; | |
4808 | } | |
4809 | ||
4810 | static int | |
d993e290 | 4811 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4812 | { |
d993e290 PA |
4813 | if (the_low_target.remove_point != NULL) |
4814 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4815 | else |
4816 | /* Unsupported (see target.h). */ | |
4817 | return 1; | |
4818 | } | |
4819 | ||
4820 | static int | |
4821 | linux_stopped_by_watchpoint (void) | |
4822 | { | |
c3adc08c PA |
4823 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4824 | ||
4825 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4826 | } |
4827 | ||
4828 | static CORE_ADDR | |
4829 | linux_stopped_data_address (void) | |
4830 | { | |
c3adc08c PA |
4831 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4832 | ||
4833 | return lwp->stopped_data_address; | |
e013ee27 OF |
4834 | } |
4835 | ||
42c81e2a | 4836 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
23512c01 MGD |
4837 | #if ! (defined(PT_TEXT_ADDR) \ |
4838 | || defined(PT_DATA_ADDR) \ | |
4839 | || defined(PT_TEXT_END_ADDR)) | |
52fb6437 NS |
4840 | #if defined(__mcoldfire__) |
4841 | /* These should really be defined in the kernel's ptrace.h header. */ | |
4842 | #define PT_TEXT_ADDR 49*4 | |
4843 | #define PT_DATA_ADDR 50*4 | |
4844 | #define PT_TEXT_END_ADDR 51*4 | |
eb826dc6 MF |
4845 | #elif defined(BFIN) |
4846 | #define PT_TEXT_ADDR 220 | |
4847 | #define PT_TEXT_END_ADDR 224 | |
4848 | #define PT_DATA_ADDR 228 | |
58dbd541 YQ |
4849 | #elif defined(__TMS320C6X__) |
4850 | #define PT_TEXT_ADDR (0x10000*4) | |
4851 | #define PT_DATA_ADDR (0x10004*4) | |
4852 | #define PT_TEXT_END_ADDR (0x10008*4) | |
52fb6437 | 4853 | #endif |
23512c01 | 4854 | #endif |
52fb6437 NS |
4855 | |
4856 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4857 | to tell gdb about. */ | |
4858 | ||
4859 | static int | |
4860 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4861 | { | |
4862 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
4863 | unsigned long text, text_end, data; | |
bd99dc85 | 4864 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4865 | |
4866 | errno = 0; | |
4867 | ||
56f7af9c MS |
4868 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) PT_TEXT_ADDR, |
4869 | (PTRACE_ARG4_TYPE) 0); | |
4870 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) PT_TEXT_END_ADDR, | |
4871 | (PTRACE_ARG4_TYPE) 0); | |
4872 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) PT_DATA_ADDR, | |
4873 | (PTRACE_ARG4_TYPE) 0); | |
52fb6437 NS |
4874 | |
4875 | if (errno == 0) | |
4876 | { | |
4877 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4878 | used by gdb) are relative to the beginning of the program, |
4879 | with the data segment immediately following the text segment. | |
4880 | However, the actual runtime layout in memory may put the data | |
4881 | somewhere else, so when we send gdb a data base-address, we | |
4882 | use the real data base address and subtract the compile-time | |
4883 | data base-address from it (which is just the length of the | |
4884 | text segment). BSS immediately follows data in both | |
4885 | cases. */ | |
52fb6437 NS |
4886 | *text_p = text; |
4887 | *data_p = data - (text_end - text); | |
1b3f6016 | 4888 | |
52fb6437 NS |
4889 | return 1; |
4890 | } | |
4891 | #endif | |
4892 | return 0; | |
4893 | } | |
4894 | #endif | |
4895 | ||
07e059b5 VP |
4896 | static int |
4897 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4898 | unsigned char *readbuf, unsigned const char *writebuf, |
4899 | CORE_ADDR offset, int len) | |
07e059b5 | 4900 | { |
d26e3629 | 4901 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4902 | } |
4903 | ||
d0722149 DE |
4904 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4905 | layout of the inferiors' architecture. */ | |
4906 | ||
4907 | static void | |
a5362b9a | 4908 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4909 | { |
4910 | int done = 0; | |
4911 | ||
4912 | if (the_low_target.siginfo_fixup != NULL) | |
4913 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4914 | ||
4915 | /* If there was no callback, or the callback didn't do anything, | |
4916 | then just do a straight memcpy. */ | |
4917 | if (!done) | |
4918 | { | |
4919 | if (direction == 1) | |
a5362b9a | 4920 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4921 | else |
a5362b9a | 4922 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
4923 | } |
4924 | } | |
4925 | ||
4aa995e1 PA |
4926 | static int |
4927 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4928 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4929 | { | |
d0722149 | 4930 | int pid; |
a5362b9a TS |
4931 | siginfo_t siginfo; |
4932 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
4933 | |
4934 | if (current_inferior == NULL) | |
4935 | return -1; | |
4936 | ||
bd99dc85 | 4937 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4938 | |
4939 | if (debug_threads) | |
d0722149 | 4940 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4941 | readbuf != NULL ? "Reading" : "Writing", |
4942 | pid); | |
4943 | ||
0adea5f7 | 4944 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4945 | return -1; |
4946 | ||
56f7af9c | 4947 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_ARG3_TYPE) 0, &siginfo) != 0) |
4aa995e1 PA |
4948 | return -1; |
4949 | ||
d0722149 DE |
4950 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4951 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4952 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4953 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4954 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4955 | ||
4aa995e1 PA |
4956 | if (offset + len > sizeof (siginfo)) |
4957 | len = sizeof (siginfo) - offset; | |
4958 | ||
4959 | if (readbuf != NULL) | |
d0722149 | 4960 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4961 | else |
4962 | { | |
d0722149 DE |
4963 | memcpy (inf_siginfo + offset, writebuf, len); |
4964 | ||
4965 | /* Convert back to ptrace layout before flushing it out. */ | |
4966 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4967 | ||
56f7af9c | 4968 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_ARG3_TYPE) 0, &siginfo) != 0) |
4aa995e1 PA |
4969 | return -1; |
4970 | } | |
4971 | ||
4972 | return len; | |
4973 | } | |
4974 | ||
bd99dc85 PA |
4975 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4976 | so we notice when children change state; as the handler for the | |
4977 | sigsuspend in my_waitpid. */ | |
4978 | ||
4979 | static void | |
4980 | sigchld_handler (int signo) | |
4981 | { | |
4982 | int old_errno = errno; | |
4983 | ||
4984 | if (debug_threads) | |
e581f2b4 PA |
4985 | { |
4986 | do | |
4987 | { | |
4988 | /* fprintf is not async-signal-safe, so call write | |
4989 | directly. */ | |
4990 | if (write (2, "sigchld_handler\n", | |
4991 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4992 | break; /* just ignore */ | |
4993 | } while (0); | |
4994 | } | |
bd99dc85 PA |
4995 | |
4996 | if (target_is_async_p ()) | |
4997 | async_file_mark (); /* trigger a linux_wait */ | |
4998 | ||
4999 | errno = old_errno; | |
5000 | } | |
5001 | ||
5002 | static int | |
5003 | linux_supports_non_stop (void) | |
5004 | { | |
5005 | return 1; | |
5006 | } | |
5007 | ||
5008 | static int | |
5009 | linux_async (int enable) | |
5010 | { | |
5011 | int previous = (linux_event_pipe[0] != -1); | |
5012 | ||
8336d594 PA |
5013 | if (debug_threads) |
5014 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
5015 | enable, previous); | |
5016 | ||
bd99dc85 PA |
5017 | if (previous != enable) |
5018 | { | |
5019 | sigset_t mask; | |
5020 | sigemptyset (&mask); | |
5021 | sigaddset (&mask, SIGCHLD); | |
5022 | ||
5023 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5024 | ||
5025 | if (enable) | |
5026 | { | |
5027 | if (pipe (linux_event_pipe) == -1) | |
5028 | fatal ("creating event pipe failed."); | |
5029 | ||
5030 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5031 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5032 | ||
5033 | /* Register the event loop handler. */ | |
5034 | add_file_handler (linux_event_pipe[0], | |
5035 | handle_target_event, NULL); | |
5036 | ||
5037 | /* Always trigger a linux_wait. */ | |
5038 | async_file_mark (); | |
5039 | } | |
5040 | else | |
5041 | { | |
5042 | delete_file_handler (linux_event_pipe[0]); | |
5043 | ||
5044 | close (linux_event_pipe[0]); | |
5045 | close (linux_event_pipe[1]); | |
5046 | linux_event_pipe[0] = -1; | |
5047 | linux_event_pipe[1] = -1; | |
5048 | } | |
5049 | ||
5050 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5051 | } | |
5052 | ||
5053 | return previous; | |
5054 | } | |
5055 | ||
5056 | static int | |
5057 | linux_start_non_stop (int nonstop) | |
5058 | { | |
5059 | /* Register or unregister from event-loop accordingly. */ | |
5060 | linux_async (nonstop); | |
5061 | return 0; | |
5062 | } | |
5063 | ||
cf8fd78b PA |
5064 | static int |
5065 | linux_supports_multi_process (void) | |
5066 | { | |
5067 | return 1; | |
5068 | } | |
5069 | ||
03583c20 UW |
5070 | static int |
5071 | linux_supports_disable_randomization (void) | |
5072 | { | |
5073 | #ifdef HAVE_PERSONALITY | |
5074 | return 1; | |
5075 | #else | |
5076 | return 0; | |
5077 | #endif | |
5078 | } | |
efcbbd14 | 5079 | |
d1feda86 YQ |
5080 | static int |
5081 | linux_supports_agent (void) | |
5082 | { | |
5083 | return 1; | |
5084 | } | |
5085 | ||
efcbbd14 UW |
5086 | /* Enumerate spufs IDs for process PID. */ |
5087 | static int | |
5088 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5089 | { | |
5090 | int pos = 0; | |
5091 | int written = 0; | |
5092 | char path[128]; | |
5093 | DIR *dir; | |
5094 | struct dirent *entry; | |
5095 | ||
5096 | sprintf (path, "/proc/%ld/fd", pid); | |
5097 | dir = opendir (path); | |
5098 | if (!dir) | |
5099 | return -1; | |
5100 | ||
5101 | rewinddir (dir); | |
5102 | while ((entry = readdir (dir)) != NULL) | |
5103 | { | |
5104 | struct stat st; | |
5105 | struct statfs stfs; | |
5106 | int fd; | |
5107 | ||
5108 | fd = atoi (entry->d_name); | |
5109 | if (!fd) | |
5110 | continue; | |
5111 | ||
5112 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5113 | if (stat (path, &st) != 0) | |
5114 | continue; | |
5115 | if (!S_ISDIR (st.st_mode)) | |
5116 | continue; | |
5117 | ||
5118 | if (statfs (path, &stfs) != 0) | |
5119 | continue; | |
5120 | if (stfs.f_type != SPUFS_MAGIC) | |
5121 | continue; | |
5122 | ||
5123 | if (pos >= offset && pos + 4 <= offset + len) | |
5124 | { | |
5125 | *(unsigned int *)(buf + pos - offset) = fd; | |
5126 | written += 4; | |
5127 | } | |
5128 | pos += 4; | |
5129 | } | |
5130 | ||
5131 | closedir (dir); | |
5132 | return written; | |
5133 | } | |
5134 | ||
5135 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5136 | object type, using the /proc file system. */ | |
5137 | static int | |
5138 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5139 | unsigned const char *writebuf, | |
5140 | CORE_ADDR offset, int len) | |
5141 | { | |
5142 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5143 | char buf[128]; | |
5144 | int fd = 0; | |
5145 | int ret = 0; | |
5146 | ||
5147 | if (!writebuf && !readbuf) | |
5148 | return -1; | |
5149 | ||
5150 | if (!*annex) | |
5151 | { | |
5152 | if (!readbuf) | |
5153 | return -1; | |
5154 | else | |
5155 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5156 | } | |
5157 | ||
5158 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5159 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5160 | if (fd <= 0) | |
5161 | return -1; | |
5162 | ||
5163 | if (offset != 0 | |
5164 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5165 | { | |
5166 | close (fd); | |
5167 | return 0; | |
5168 | } | |
5169 | ||
5170 | if (writebuf) | |
5171 | ret = write (fd, writebuf, (size_t) len); | |
5172 | else | |
5173 | ret = read (fd, readbuf, (size_t) len); | |
5174 | ||
5175 | close (fd); | |
5176 | return ret; | |
5177 | } | |
5178 | ||
723b724b | 5179 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5180 | struct target_loadseg |
5181 | { | |
5182 | /* Core address to which the segment is mapped. */ | |
5183 | Elf32_Addr addr; | |
5184 | /* VMA recorded in the program header. */ | |
5185 | Elf32_Addr p_vaddr; | |
5186 | /* Size of this segment in memory. */ | |
5187 | Elf32_Word p_memsz; | |
5188 | }; | |
5189 | ||
723b724b | 5190 | # if defined PT_GETDSBT |
78d85199 YQ |
5191 | struct target_loadmap |
5192 | { | |
5193 | /* Protocol version number, must be zero. */ | |
5194 | Elf32_Word version; | |
5195 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5196 | unsigned *dsbt_table; | |
5197 | unsigned dsbt_size, dsbt_index; | |
5198 | /* Number of segments in this map. */ | |
5199 | Elf32_Word nsegs; | |
5200 | /* The actual memory map. */ | |
5201 | struct target_loadseg segs[/*nsegs*/]; | |
5202 | }; | |
723b724b MF |
5203 | # define LINUX_LOADMAP PT_GETDSBT |
5204 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5205 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5206 | # else | |
5207 | struct target_loadmap | |
5208 | { | |
5209 | /* Protocol version number, must be zero. */ | |
5210 | Elf32_Half version; | |
5211 | /* Number of segments in this map. */ | |
5212 | Elf32_Half nsegs; | |
5213 | /* The actual memory map. */ | |
5214 | struct target_loadseg segs[/*nsegs*/]; | |
5215 | }; | |
5216 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5217 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5218 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5219 | # endif | |
78d85199 | 5220 | |
78d85199 YQ |
5221 | static int |
5222 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5223 | unsigned char *myaddr, unsigned int len) | |
5224 | { | |
5225 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5226 | int addr = -1; | |
5227 | struct target_loadmap *data = NULL; | |
5228 | unsigned int actual_length, copy_length; | |
5229 | ||
5230 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5231 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5232 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5233 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5234 | else |
5235 | return -1; | |
5236 | ||
723b724b | 5237 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5238 | return -1; |
5239 | ||
5240 | if (data == NULL) | |
5241 | return -1; | |
5242 | ||
5243 | actual_length = sizeof (struct target_loadmap) | |
5244 | + sizeof (struct target_loadseg) * data->nsegs; | |
5245 | ||
5246 | if (offset < 0 || offset > actual_length) | |
5247 | return -1; | |
5248 | ||
5249 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5250 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5251 | return copy_length; | |
5252 | } | |
723b724b MF |
5253 | #else |
5254 | # define linux_read_loadmap NULL | |
5255 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5256 | |
1570b33e L |
5257 | static void |
5258 | linux_process_qsupported (const char *query) | |
5259 | { | |
5260 | if (the_low_target.process_qsupported != NULL) | |
5261 | the_low_target.process_qsupported (query); | |
5262 | } | |
5263 | ||
219f2f23 PA |
5264 | static int |
5265 | linux_supports_tracepoints (void) | |
5266 | { | |
5267 | if (*the_low_target.supports_tracepoints == NULL) | |
5268 | return 0; | |
5269 | ||
5270 | return (*the_low_target.supports_tracepoints) (); | |
5271 | } | |
5272 | ||
5273 | static CORE_ADDR | |
5274 | linux_read_pc (struct regcache *regcache) | |
5275 | { | |
5276 | if (the_low_target.get_pc == NULL) | |
5277 | return 0; | |
5278 | ||
5279 | return (*the_low_target.get_pc) (regcache); | |
5280 | } | |
5281 | ||
5282 | static void | |
5283 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5284 | { | |
5285 | gdb_assert (the_low_target.set_pc != NULL); | |
5286 | ||
5287 | (*the_low_target.set_pc) (regcache, pc); | |
5288 | } | |
5289 | ||
8336d594 PA |
5290 | static int |
5291 | linux_thread_stopped (struct thread_info *thread) | |
5292 | { | |
5293 | return get_thread_lwp (thread)->stopped; | |
5294 | } | |
5295 | ||
5296 | /* This exposes stop-all-threads functionality to other modules. */ | |
5297 | ||
5298 | static void | |
7984d532 | 5299 | linux_pause_all (int freeze) |
8336d594 | 5300 | { |
7984d532 PA |
5301 | stop_all_lwps (freeze, NULL); |
5302 | } | |
5303 | ||
5304 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5305 | modules. */ | |
5306 | ||
5307 | static void | |
5308 | linux_unpause_all (int unfreeze) | |
5309 | { | |
5310 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5311 | } |
5312 | ||
90d74c30 PA |
5313 | static int |
5314 | linux_prepare_to_access_memory (void) | |
5315 | { | |
5316 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5317 | running LWP. */ | |
5318 | if (non_stop) | |
5319 | linux_pause_all (1); | |
5320 | return 0; | |
5321 | } | |
5322 | ||
5323 | static void | |
0146f85b | 5324 | linux_done_accessing_memory (void) |
90d74c30 PA |
5325 | { |
5326 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5327 | running LWP. */ | |
5328 | if (non_stop) | |
5329 | linux_unpause_all (1); | |
5330 | } | |
5331 | ||
fa593d66 PA |
5332 | static int |
5333 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5334 | CORE_ADDR collector, | |
5335 | CORE_ADDR lockaddr, | |
5336 | ULONGEST orig_size, | |
5337 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5338 | CORE_ADDR *trampoline, |
5339 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5340 | unsigned char *jjump_pad_insn, |
5341 | ULONGEST *jjump_pad_insn_size, | |
5342 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5343 | CORE_ADDR *adjusted_insn_addr_end, |
5344 | char *err) | |
fa593d66 PA |
5345 | { |
5346 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5347 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5348 | jump_entry, trampoline, trampoline_size, |
5349 | jjump_pad_insn, jjump_pad_insn_size, | |
5350 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5351 | err); | |
fa593d66 PA |
5352 | } |
5353 | ||
6a271cae PA |
5354 | static struct emit_ops * |
5355 | linux_emit_ops (void) | |
5356 | { | |
5357 | if (the_low_target.emit_ops != NULL) | |
5358 | return (*the_low_target.emit_ops) (); | |
5359 | else | |
5360 | return NULL; | |
5361 | } | |
5362 | ||
405f8e94 SS |
5363 | static int |
5364 | linux_get_min_fast_tracepoint_insn_len (void) | |
5365 | { | |
5366 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5367 | } | |
5368 | ||
2268b414 JK |
5369 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5370 | ||
5371 | static int | |
5372 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5373 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5374 | { | |
5375 | char filename[PATH_MAX]; | |
5376 | int fd; | |
5377 | const int auxv_size = is_elf64 | |
5378 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5379 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5380 | ||
5381 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5382 | ||
5383 | fd = open (filename, O_RDONLY); | |
5384 | if (fd < 0) | |
5385 | return 1; | |
5386 | ||
5387 | *phdr_memaddr = 0; | |
5388 | *num_phdr = 0; | |
5389 | while (read (fd, buf, auxv_size) == auxv_size | |
5390 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5391 | { | |
5392 | if (is_elf64) | |
5393 | { | |
5394 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5395 | ||
5396 | switch (aux->a_type) | |
5397 | { | |
5398 | case AT_PHDR: | |
5399 | *phdr_memaddr = aux->a_un.a_val; | |
5400 | break; | |
5401 | case AT_PHNUM: | |
5402 | *num_phdr = aux->a_un.a_val; | |
5403 | break; | |
5404 | } | |
5405 | } | |
5406 | else | |
5407 | { | |
5408 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5409 | ||
5410 | switch (aux->a_type) | |
5411 | { | |
5412 | case AT_PHDR: | |
5413 | *phdr_memaddr = aux->a_un.a_val; | |
5414 | break; | |
5415 | case AT_PHNUM: | |
5416 | *num_phdr = aux->a_un.a_val; | |
5417 | break; | |
5418 | } | |
5419 | } | |
5420 | } | |
5421 | ||
5422 | close (fd); | |
5423 | ||
5424 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5425 | { | |
5426 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5427 | "phdr_memaddr = %ld, phdr_num = %d", | |
5428 | (long) *phdr_memaddr, *num_phdr); | |
5429 | return 2; | |
5430 | } | |
5431 | ||
5432 | return 0; | |
5433 | } | |
5434 | ||
5435 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5436 | ||
5437 | static CORE_ADDR | |
5438 | get_dynamic (const int pid, const int is_elf64) | |
5439 | { | |
5440 | CORE_ADDR phdr_memaddr, relocation; | |
5441 | int num_phdr, i; | |
5442 | unsigned char *phdr_buf; | |
5443 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5444 | ||
5445 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5446 | return 0; | |
5447 | ||
5448 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5449 | phdr_buf = alloca (num_phdr * phdr_size); | |
5450 | ||
5451 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5452 | return 0; | |
5453 | ||
5454 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5455 | non-zero for PIE ones. */ | |
5456 | relocation = -1; | |
5457 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5458 | if (is_elf64) | |
5459 | { | |
5460 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5461 | ||
5462 | if (p->p_type == PT_PHDR) | |
5463 | relocation = phdr_memaddr - p->p_vaddr; | |
5464 | } | |
5465 | else | |
5466 | { | |
5467 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5468 | ||
5469 | if (p->p_type == PT_PHDR) | |
5470 | relocation = phdr_memaddr - p->p_vaddr; | |
5471 | } | |
5472 | ||
5473 | if (relocation == -1) | |
5474 | { | |
e237a7e2 JK |
5475 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5476 | any real world executables, including PIE executables, have always | |
5477 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5478 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5479 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5480 | ||
5481 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5482 | ||
5483 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5484 | ||
2268b414 JK |
5485 | return 0; |
5486 | } | |
5487 | ||
5488 | for (i = 0; i < num_phdr; i++) | |
5489 | { | |
5490 | if (is_elf64) | |
5491 | { | |
5492 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5493 | ||
5494 | if (p->p_type == PT_DYNAMIC) | |
5495 | return p->p_vaddr + relocation; | |
5496 | } | |
5497 | else | |
5498 | { | |
5499 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5500 | ||
5501 | if (p->p_type == PT_DYNAMIC) | |
5502 | return p->p_vaddr + relocation; | |
5503 | } | |
5504 | } | |
5505 | ||
5506 | return 0; | |
5507 | } | |
5508 | ||
5509 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5510 | can be 0 if the inferior does not yet have the library list initialized. |
5511 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5512 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5513 | |
5514 | static CORE_ADDR | |
5515 | get_r_debug (const int pid, const int is_elf64) | |
5516 | { | |
5517 | CORE_ADDR dynamic_memaddr; | |
5518 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5519 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5520 | CORE_ADDR map = -1; |
2268b414 JK |
5521 | |
5522 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5523 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5524 | return map; |
2268b414 JK |
5525 | |
5526 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5527 | { | |
5528 | if (is_elf64) | |
5529 | { | |
5530 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5531 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5532 | union |
5533 | { | |
5534 | Elf64_Xword map; | |
5535 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5536 | } | |
5537 | rld_map; | |
5538 | ||
5539 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5540 | { | |
5541 | if (linux_read_memory (dyn->d_un.d_val, | |
5542 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5543 | return rld_map.map; | |
5544 | else | |
5545 | break; | |
5546 | } | |
75f62ce7 | 5547 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5548 | |
367ba2c2 MR |
5549 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5550 | map = dyn->d_un.d_val; | |
2268b414 JK |
5551 | |
5552 | if (dyn->d_tag == DT_NULL) | |
5553 | break; | |
5554 | } | |
5555 | else | |
5556 | { | |
5557 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5558 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5559 | union |
5560 | { | |
5561 | Elf32_Word map; | |
5562 | unsigned char buf[sizeof (Elf32_Word)]; | |
5563 | } | |
5564 | rld_map; | |
5565 | ||
5566 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5567 | { | |
5568 | if (linux_read_memory (dyn->d_un.d_val, | |
5569 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5570 | return rld_map.map; | |
5571 | else | |
5572 | break; | |
5573 | } | |
75f62ce7 | 5574 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5575 | |
367ba2c2 MR |
5576 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5577 | map = dyn->d_un.d_val; | |
2268b414 JK |
5578 | |
5579 | if (dyn->d_tag == DT_NULL) | |
5580 | break; | |
5581 | } | |
5582 | ||
5583 | dynamic_memaddr += dyn_size; | |
5584 | } | |
5585 | ||
367ba2c2 | 5586 | return map; |
2268b414 JK |
5587 | } |
5588 | ||
5589 | /* Read one pointer from MEMADDR in the inferior. */ | |
5590 | ||
5591 | static int | |
5592 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5593 | { | |
485f1ee4 PA |
5594 | int ret; |
5595 | ||
5596 | /* Go through a union so this works on either big or little endian | |
5597 | hosts, when the inferior's pointer size is smaller than the size | |
5598 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5599 | same of the superior's. */ | |
5600 | union | |
5601 | { | |
5602 | CORE_ADDR core_addr; | |
5603 | unsigned int ui; | |
5604 | unsigned char uc; | |
5605 | } addr; | |
5606 | ||
5607 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5608 | if (ret == 0) | |
5609 | { | |
5610 | if (ptr_size == sizeof (CORE_ADDR)) | |
5611 | *ptr = addr.core_addr; | |
5612 | else if (ptr_size == sizeof (unsigned int)) | |
5613 | *ptr = addr.ui; | |
5614 | else | |
5615 | gdb_assert_not_reached ("unhandled pointer size"); | |
5616 | } | |
5617 | return ret; | |
2268b414 JK |
5618 | } |
5619 | ||
5620 | struct link_map_offsets | |
5621 | { | |
5622 | /* Offset and size of r_debug.r_version. */ | |
5623 | int r_version_offset; | |
5624 | ||
5625 | /* Offset and size of r_debug.r_map. */ | |
5626 | int r_map_offset; | |
5627 | ||
5628 | /* Offset to l_addr field in struct link_map. */ | |
5629 | int l_addr_offset; | |
5630 | ||
5631 | /* Offset to l_name field in struct link_map. */ | |
5632 | int l_name_offset; | |
5633 | ||
5634 | /* Offset to l_ld field in struct link_map. */ | |
5635 | int l_ld_offset; | |
5636 | ||
5637 | /* Offset to l_next field in struct link_map. */ | |
5638 | int l_next_offset; | |
5639 | ||
5640 | /* Offset to l_prev field in struct link_map. */ | |
5641 | int l_prev_offset; | |
5642 | }; | |
5643 | ||
fb723180 | 5644 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5645 | |
5646 | static int | |
5647 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5648 | unsigned const char *writebuf, | |
5649 | CORE_ADDR offset, int len) | |
5650 | { | |
5651 | char *document; | |
5652 | unsigned document_len; | |
5653 | struct process_info_private *const priv = current_process ()->private; | |
5654 | char filename[PATH_MAX]; | |
5655 | int pid, is_elf64; | |
5656 | ||
5657 | static const struct link_map_offsets lmo_32bit_offsets = | |
5658 | { | |
5659 | 0, /* r_version offset. */ | |
5660 | 4, /* r_debug.r_map offset. */ | |
5661 | 0, /* l_addr offset in link_map. */ | |
5662 | 4, /* l_name offset in link_map. */ | |
5663 | 8, /* l_ld offset in link_map. */ | |
5664 | 12, /* l_next offset in link_map. */ | |
5665 | 16 /* l_prev offset in link_map. */ | |
5666 | }; | |
5667 | ||
5668 | static const struct link_map_offsets lmo_64bit_offsets = | |
5669 | { | |
5670 | 0, /* r_version offset. */ | |
5671 | 8, /* r_debug.r_map offset. */ | |
5672 | 0, /* l_addr offset in link_map. */ | |
5673 | 8, /* l_name offset in link_map. */ | |
5674 | 16, /* l_ld offset in link_map. */ | |
5675 | 24, /* l_next offset in link_map. */ | |
5676 | 32 /* l_prev offset in link_map. */ | |
5677 | }; | |
5678 | const struct link_map_offsets *lmo; | |
214d508e | 5679 | unsigned int machine; |
2268b414 JK |
5680 | |
5681 | if (writebuf != NULL) | |
5682 | return -2; | |
5683 | if (readbuf == NULL) | |
5684 | return -1; | |
5685 | ||
5686 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5687 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
214d508e | 5688 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 JK |
5689 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
5690 | ||
5691 | if (priv->r_debug == 0) | |
5692 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5693 | ||
0c5bf5a9 JK |
5694 | /* We failed to find DT_DEBUG. Such situation will not change for this |
5695 | inferior - do not retry it. Report it to GDB as E01, see for the reasons | |
5696 | at the GDB solib-svr4.c side. */ | |
5697 | if (priv->r_debug == (CORE_ADDR) -1) | |
5698 | return -1; | |
5699 | ||
5700 | if (priv->r_debug == 0) | |
2268b414 JK |
5701 | { |
5702 | document = xstrdup ("<library-list-svr4 version=\"1.0\"/>\n"); | |
5703 | } | |
5704 | else | |
5705 | { | |
5706 | int allocated = 1024; | |
5707 | char *p; | |
5708 | const int ptr_size = is_elf64 ? 8 : 4; | |
5709 | CORE_ADDR lm_addr, lm_prev, l_name, l_addr, l_ld, l_next, l_prev; | |
5710 | int r_version, header_done = 0; | |
5711 | ||
5712 | document = xmalloc (allocated); | |
5713 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5714 | p = document + strlen (document); | |
5715 | ||
5716 | r_version = 0; | |
5717 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, | |
5718 | (unsigned char *) &r_version, | |
5719 | sizeof (r_version)) != 0 | |
5720 | || r_version != 1) | |
5721 | { | |
5722 | warning ("unexpected r_debug version %d", r_version); | |
5723 | goto done; | |
5724 | } | |
5725 | ||
5726 | if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5727 | &lm_addr, ptr_size) != 0) | |
5728 | { | |
5729 | warning ("unable to read r_map from 0x%lx", | |
5730 | (long) priv->r_debug + lmo->r_map_offset); | |
5731 | goto done; | |
5732 | } | |
5733 | ||
5734 | lm_prev = 0; | |
5735 | while (read_one_ptr (lm_addr + lmo->l_name_offset, | |
5736 | &l_name, ptr_size) == 0 | |
5737 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5738 | &l_addr, ptr_size) == 0 | |
5739 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5740 | &l_ld, ptr_size) == 0 | |
5741 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5742 | &l_prev, ptr_size) == 0 | |
5743 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5744 | &l_next, ptr_size) == 0) | |
5745 | { | |
5746 | unsigned char libname[PATH_MAX]; | |
5747 | ||
5748 | if (lm_prev != l_prev) | |
5749 | { | |
5750 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", | |
5751 | (long) lm_prev, (long) l_prev); | |
5752 | break; | |
5753 | } | |
5754 | ||
5755 | /* Not checking for error because reading may stop before | |
5756 | we've got PATH_MAX worth of characters. */ | |
5757 | libname[0] = '\0'; | |
5758 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5759 | libname[sizeof (libname) - 1] = '\0'; | |
5760 | if (libname[0] != '\0') | |
5761 | { | |
5762 | /* 6x the size for xml_escape_text below. */ | |
5763 | size_t len = 6 * strlen ((char *) libname); | |
5764 | char *name; | |
5765 | ||
5766 | if (!header_done) | |
5767 | { | |
5768 | /* Terminate `<library-list-svr4'. */ | |
5769 | *p++ = '>'; | |
5770 | header_done = 1; | |
5771 | } | |
5772 | ||
5773 | while (allocated < p - document + len + 200) | |
5774 | { | |
5775 | /* Expand to guarantee sufficient storage. */ | |
5776 | uintptr_t document_len = p - document; | |
5777 | ||
5778 | document = xrealloc (document, 2 * allocated); | |
5779 | allocated *= 2; | |
5780 | p = document + document_len; | |
5781 | } | |
5782 | ||
5783 | name = xml_escape_text ((char *) libname); | |
5784 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5785 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5786 | name, (unsigned long) lm_addr, | |
5787 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5788 | free (name); | |
5789 | } | |
5790 | else if (lm_prev == 0) | |
5791 | { | |
5792 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); | |
5793 | p = p + strlen (p); | |
5794 | } | |
5795 | ||
5796 | if (l_next == 0) | |
5797 | break; | |
5798 | ||
5799 | lm_prev = lm_addr; | |
5800 | lm_addr = l_next; | |
5801 | } | |
5802 | done: | |
0afae3cf PA |
5803 | if (!header_done) |
5804 | { | |
5805 | /* Empty list; terminate `<library-list-svr4'. */ | |
5806 | strcpy (p, "/>"); | |
5807 | } | |
5808 | else | |
5809 | strcpy (p, "</library-list-svr4>"); | |
2268b414 JK |
5810 | } |
5811 | ||
5812 | document_len = strlen (document); | |
5813 | if (offset < document_len) | |
5814 | document_len -= offset; | |
5815 | else | |
5816 | document_len = 0; | |
5817 | if (len > document_len) | |
5818 | len = document_len; | |
5819 | ||
5820 | memcpy (readbuf, document + offset, len); | |
5821 | xfree (document); | |
5822 | ||
5823 | return len; | |
5824 | } | |
5825 | ||
9accd112 MM |
5826 | #ifdef HAVE_LINUX_BTRACE |
5827 | ||
5828 | /* Enable branch tracing. */ | |
5829 | ||
5830 | static struct btrace_target_info * | |
5831 | linux_low_enable_btrace (ptid_t ptid) | |
5832 | { | |
5833 | struct btrace_target_info *tinfo; | |
5834 | ||
5835 | tinfo = linux_enable_btrace (ptid); | |
5836 | if (tinfo != NULL) | |
5837 | tinfo->ptr_bits = register_size (0) * 8; | |
5838 | ||
5839 | return tinfo; | |
5840 | } | |
5841 | ||
5842 | /* Read branch trace data as btrace xml document. */ | |
5843 | ||
5844 | static void | |
5845 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, | |
5846 | int type) | |
5847 | { | |
5848 | VEC (btrace_block_s) *btrace; | |
5849 | struct btrace_block *block; | |
5850 | int i; | |
5851 | ||
5852 | btrace = linux_read_btrace (tinfo, type); | |
5853 | ||
5854 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
5855 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
5856 | ||
5857 | for (i = 0; VEC_iterate (btrace_block_s, btrace, i, block); i++) | |
5858 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
5859 | paddress (block->begin), paddress (block->end)); | |
5860 | ||
5861 | buffer_grow_str (buffer, "</btrace>\n"); | |
5862 | ||
5863 | VEC_free (btrace_block_s, btrace); | |
5864 | } | |
5865 | #endif /* HAVE_LINUX_BTRACE */ | |
5866 | ||
ce3a066d DJ |
5867 | static struct target_ops linux_target_ops = { |
5868 | linux_create_inferior, | |
5869 | linux_attach, | |
5870 | linux_kill, | |
6ad8ae5c | 5871 | linux_detach, |
8336d594 | 5872 | linux_mourn, |
444d6139 | 5873 | linux_join, |
ce3a066d DJ |
5874 | linux_thread_alive, |
5875 | linux_resume, | |
5876 | linux_wait, | |
5877 | linux_fetch_registers, | |
5878 | linux_store_registers, | |
90d74c30 | 5879 | linux_prepare_to_access_memory, |
0146f85b | 5880 | linux_done_accessing_memory, |
ce3a066d DJ |
5881 | linux_read_memory, |
5882 | linux_write_memory, | |
2f2893d9 | 5883 | linux_look_up_symbols, |
ef57601b | 5884 | linux_request_interrupt, |
aa691b87 | 5885 | linux_read_auxv, |
d993e290 PA |
5886 | linux_insert_point, |
5887 | linux_remove_point, | |
e013ee27 OF |
5888 | linux_stopped_by_watchpoint, |
5889 | linux_stopped_data_address, | |
42c81e2a | 5890 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 5891 | linux_read_offsets, |
dae5f5cf DJ |
5892 | #else |
5893 | NULL, | |
5894 | #endif | |
5895 | #ifdef USE_THREAD_DB | |
5896 | thread_db_get_tls_address, | |
5897 | #else | |
5898 | NULL, | |
52fb6437 | 5899 | #endif |
efcbbd14 | 5900 | linux_qxfer_spu, |
59a016f0 | 5901 | hostio_last_error_from_errno, |
07e059b5 | 5902 | linux_qxfer_osdata, |
4aa995e1 | 5903 | linux_xfer_siginfo, |
bd99dc85 PA |
5904 | linux_supports_non_stop, |
5905 | linux_async, | |
5906 | linux_start_non_stop, | |
cdbfd419 PP |
5907 | linux_supports_multi_process, |
5908 | #ifdef USE_THREAD_DB | |
dc146f7c | 5909 | thread_db_handle_monitor_command, |
cdbfd419 | 5910 | #else |
dc146f7c | 5911 | NULL, |
cdbfd419 | 5912 | #endif |
d26e3629 | 5913 | linux_common_core_of_thread, |
78d85199 | 5914 | linux_read_loadmap, |
219f2f23 PA |
5915 | linux_process_qsupported, |
5916 | linux_supports_tracepoints, | |
5917 | linux_read_pc, | |
8336d594 PA |
5918 | linux_write_pc, |
5919 | linux_thread_stopped, | |
7984d532 | 5920 | NULL, |
711e434b | 5921 | linux_pause_all, |
7984d532 | 5922 | linux_unpause_all, |
fa593d66 PA |
5923 | linux_cancel_breakpoints, |
5924 | linux_stabilize_threads, | |
6a271cae | 5925 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
5926 | linux_emit_ops, |
5927 | linux_supports_disable_randomization, | |
405f8e94 | 5928 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 5929 | linux_qxfer_libraries_svr4, |
d1feda86 | 5930 | linux_supports_agent, |
9accd112 MM |
5931 | #ifdef HAVE_LINUX_BTRACE |
5932 | linux_supports_btrace, | |
5933 | linux_low_enable_btrace, | |
5934 | linux_disable_btrace, | |
5935 | linux_low_read_btrace, | |
5936 | #else | |
5937 | NULL, | |
5938 | NULL, | |
5939 | NULL, | |
5940 | NULL, | |
9accd112 | 5941 | #endif |
ce3a066d DJ |
5942 | }; |
5943 | ||
0d62e5e8 DJ |
5944 | static void |
5945 | linux_init_signals () | |
5946 | { | |
5947 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5948 | to find what the cancel signal actually is. */ | |
1a981360 | 5949 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5950 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5951 | #endif |
0d62e5e8 DJ |
5952 | } |
5953 | ||
da6d8c04 DJ |
5954 | void |
5955 | initialize_low (void) | |
5956 | { | |
bd99dc85 PA |
5957 | struct sigaction sigchld_action; |
5958 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5959 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5960 | set_breakpoint_data (the_low_target.breakpoint, |
5961 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5962 | linux_init_signals (); |
24a09b5f | 5963 | linux_test_for_tracefork (); |
aa7c7447 | 5964 | linux_ptrace_init_warnings (); |
52fa2412 UW |
5965 | #ifdef HAVE_LINUX_REGSETS |
5966 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
5967 | ; | |
bca929d3 | 5968 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 5969 | #endif |
bd99dc85 PA |
5970 | |
5971 | sigchld_action.sa_handler = sigchld_handler; | |
5972 | sigemptyset (&sigchld_action.sa_mask); | |
5973 | sigchld_action.sa_flags = SA_RESTART; | |
5974 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 5975 | } |