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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
0b302171 | 2 | Copyright (C) 1995-1996, 1998-2012 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
d26e3629 | 21 | #include "linux-osdata.h" |
58b4daa5 | 22 | #include "agent.h" |
da6d8c04 | 23 | |
58caa3dc | 24 | #include <sys/wait.h> |
da6d8c04 DJ |
25 | #include <stdio.h> |
26 | #include <sys/param.h> | |
da6d8c04 | 27 | #include <sys/ptrace.h> |
af96c192 | 28 | #include "linux-ptrace.h" |
e3deef73 | 29 | #include "linux-procfs.h" |
da6d8c04 DJ |
30 | #include <signal.h> |
31 | #include <sys/ioctl.h> | |
32 | #include <fcntl.h> | |
d07c63e7 | 33 | #include <string.h> |
0a30fbc4 DJ |
34 | #include <stdlib.h> |
35 | #include <unistd.h> | |
fa6a77dc | 36 | #include <errno.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
efcbbd14 UW |
43 | #include <sys/stat.h> |
44 | #include <sys/vfs.h> | |
1570b33e | 45 | #include <sys/uio.h> |
957f3f49 DE |
46 | #ifndef ELFMAG0 |
47 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
48 | then ELFMAG0 will have been defined. If it didn't get included by | |
49 | gdb_proc_service.h then including it will likely introduce a duplicate | |
50 | definition of elf_fpregset_t. */ | |
51 | #include <elf.h> | |
52 | #endif | |
efcbbd14 UW |
53 | |
54 | #ifndef SPUFS_MAGIC | |
55 | #define SPUFS_MAGIC 0x23c9b64e | |
56 | #endif | |
da6d8c04 | 57 | |
03583c20 UW |
58 | #ifdef HAVE_PERSONALITY |
59 | # include <sys/personality.h> | |
60 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
61 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
62 | # endif | |
63 | #endif | |
64 | ||
fd462a61 DJ |
65 | #ifndef O_LARGEFILE |
66 | #define O_LARGEFILE 0 | |
67 | #endif | |
68 | ||
ec8ebe72 DE |
69 | #ifndef W_STOPCODE |
70 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
71 | #endif | |
72 | ||
1a981360 PA |
73 | /* This is the kernel's hard limit. Not to be confused with |
74 | SIGRTMIN. */ | |
75 | #ifndef __SIGRTMIN | |
76 | #define __SIGRTMIN 32 | |
77 | #endif | |
78 | ||
42c81e2a DJ |
79 | #ifdef __UCLIBC__ |
80 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
23512c01 MGD |
81 | /* PTRACE_TEXT_ADDR and friends. */ |
82 | #include <asm/ptrace.h> | |
42c81e2a DJ |
83 | #define HAS_NOMMU |
84 | #endif | |
85 | #endif | |
86 | ||
8365dcf5 TJB |
87 | #ifndef HAVE_ELF32_AUXV_T |
88 | /* Copied from glibc's elf.h. */ | |
89 | typedef struct | |
90 | { | |
91 | uint32_t a_type; /* Entry type */ | |
92 | union | |
93 | { | |
94 | uint32_t a_val; /* Integer value */ | |
95 | /* We use to have pointer elements added here. We cannot do that, | |
96 | though, since it does not work when using 32-bit definitions | |
97 | on 64-bit platforms and vice versa. */ | |
98 | } a_un; | |
99 | } Elf32_auxv_t; | |
100 | #endif | |
101 | ||
102 | #ifndef HAVE_ELF64_AUXV_T | |
103 | /* Copied from glibc's elf.h. */ | |
104 | typedef struct | |
105 | { | |
106 | uint64_t a_type; /* Entry type */ | |
107 | union | |
108 | { | |
109 | uint64_t a_val; /* Integer value */ | |
110 | /* We use to have pointer elements added here. We cannot do that, | |
111 | though, since it does not work when using 32-bit definitions | |
112 | on 64-bit platforms and vice versa. */ | |
113 | } a_un; | |
114 | } Elf64_auxv_t; | |
115 | #endif | |
116 | ||
24a09b5f DJ |
117 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
118 | representation of the thread ID. | |
611cb4a5 | 119 | |
54a0b537 | 120 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
121 | the same as the LWP ID. |
122 | ||
123 | ``all_processes'' is keyed by the "overall process ID", which | |
124 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 125 | |
54a0b537 | 126 | struct inferior_list all_lwps; |
0d62e5e8 | 127 | |
05044653 PA |
128 | /* A list of all unknown processes which receive stop signals. Some |
129 | other process will presumably claim each of these as forked | |
130 | children momentarily. */ | |
24a09b5f | 131 | |
05044653 PA |
132 | struct simple_pid_list |
133 | { | |
134 | /* The process ID. */ | |
135 | int pid; | |
136 | ||
137 | /* The status as reported by waitpid. */ | |
138 | int status; | |
139 | ||
140 | /* Next in chain. */ | |
141 | struct simple_pid_list *next; | |
142 | }; | |
143 | struct simple_pid_list *stopped_pids; | |
144 | ||
145 | /* Trivial list manipulation functions to keep track of a list of new | |
146 | stopped processes. */ | |
147 | ||
148 | static void | |
149 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
150 | { | |
151 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
152 | ||
153 | new_pid->pid = pid; | |
154 | new_pid->status = status; | |
155 | new_pid->next = *listp; | |
156 | *listp = new_pid; | |
157 | } | |
158 | ||
159 | static int | |
160 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
161 | { | |
162 | struct simple_pid_list **p; | |
163 | ||
164 | for (p = listp; *p != NULL; p = &(*p)->next) | |
165 | if ((*p)->pid == pid) | |
166 | { | |
167 | struct simple_pid_list *next = (*p)->next; | |
168 | ||
169 | *statusp = (*p)->status; | |
170 | xfree (*p); | |
171 | *p = next; | |
172 | return 1; | |
173 | } | |
174 | return 0; | |
175 | } | |
24a09b5f | 176 | |
bde24c0a PA |
177 | enum stopping_threads_kind |
178 | { | |
179 | /* Not stopping threads presently. */ | |
180 | NOT_STOPPING_THREADS, | |
181 | ||
182 | /* Stopping threads. */ | |
183 | STOPPING_THREADS, | |
184 | ||
185 | /* Stopping and suspending threads. */ | |
186 | STOPPING_AND_SUSPENDING_THREADS | |
187 | }; | |
188 | ||
189 | /* This is set while stop_all_lwps is in effect. */ | |
190 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
191 | |
192 | /* FIXME make into a target method? */ | |
24a09b5f | 193 | int using_threads = 1; |
24a09b5f | 194 | |
fa593d66 PA |
195 | /* True if we're presently stabilizing threads (moving them out of |
196 | jump pads). */ | |
197 | static int stabilizing_threads; | |
198 | ||
95954743 PA |
199 | /* This flag is true iff we've just created or attached to our first |
200 | inferior but it has not stopped yet. As soon as it does, we need | |
201 | to call the low target's arch_setup callback. Doing this only on | |
202 | the first inferior avoids reinializing the architecture on every | |
203 | inferior, and avoids messing with the register caches of the | |
204 | already running inferiors. NOTE: this assumes all inferiors under | |
205 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
206 | static int new_inferior; |
207 | ||
2acc282a | 208 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 209 | int step, int signal, siginfo_t *info); |
2bd7c093 | 210 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
211 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
212 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 213 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 214 | static void *add_lwp (ptid_t ptid); |
c35fafde | 215 | static int linux_stopped_by_watchpoint (void); |
95954743 | 216 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 217 | static void proceed_all_lwps (void); |
d50171e4 PA |
218 | static int finish_step_over (struct lwp_info *lwp); |
219 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
220 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 221 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
222 | |
223 | /* True if the low target can hardware single-step. Such targets | |
224 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
225 | ||
226 | static int | |
227 | can_hardware_single_step (void) | |
228 | { | |
229 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
230 | } | |
231 | ||
232 | /* True if the low target supports memory breakpoints. If so, we'll | |
233 | have a GET_PC implementation. */ | |
234 | ||
235 | static int | |
236 | supports_breakpoints (void) | |
237 | { | |
238 | return (the_low_target.get_pc != NULL); | |
239 | } | |
0d62e5e8 | 240 | |
fa593d66 PA |
241 | /* Returns true if this target can support fast tracepoints. This |
242 | does not mean that the in-process agent has been loaded in the | |
243 | inferior. */ | |
244 | ||
245 | static int | |
246 | supports_fast_tracepoints (void) | |
247 | { | |
248 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
249 | } | |
250 | ||
0d62e5e8 DJ |
251 | struct pending_signals |
252 | { | |
253 | int signal; | |
32ca6d61 | 254 | siginfo_t info; |
0d62e5e8 DJ |
255 | struct pending_signals *prev; |
256 | }; | |
611cb4a5 | 257 | |
58caa3dc | 258 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
259 | static char *disabled_regsets; |
260 | static int num_regsets; | |
58caa3dc DJ |
261 | #endif |
262 | ||
bd99dc85 PA |
263 | /* The read/write ends of the pipe registered as waitable file in the |
264 | event loop. */ | |
265 | static int linux_event_pipe[2] = { -1, -1 }; | |
266 | ||
267 | /* True if we're currently in async mode. */ | |
268 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
269 | ||
02fc4de7 | 270 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
271 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
272 | ||
d0722149 DE |
273 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
274 | ||
275 | static int | |
214d508e | 276 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 277 | { |
214d508e L |
278 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
279 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
280 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
281 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
282 | { | |
283 | *machine = header->e_machine; | |
284 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
285 | ||
286 | } | |
287 | *machine = EM_NONE; | |
288 | return -1; | |
d0722149 DE |
289 | } |
290 | ||
291 | /* Return non-zero if FILE is a 64-bit ELF file, | |
292 | zero if the file is not a 64-bit ELF file, | |
293 | and -1 if the file is not accessible or doesn't exist. */ | |
294 | ||
be07f1a2 | 295 | static int |
214d508e | 296 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 297 | { |
957f3f49 | 298 | Elf64_Ehdr header; |
d0722149 DE |
299 | int fd; |
300 | ||
301 | fd = open (file, O_RDONLY); | |
302 | if (fd < 0) | |
303 | return -1; | |
304 | ||
305 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
306 | { | |
307 | close (fd); | |
308 | return 0; | |
309 | } | |
310 | close (fd); | |
311 | ||
214d508e | 312 | return elf_64_header_p (&header, machine); |
d0722149 DE |
313 | } |
314 | ||
be07f1a2 PA |
315 | /* Accepts an integer PID; Returns true if the executable PID is |
316 | running is a 64-bit ELF file.. */ | |
317 | ||
318 | int | |
214d508e | 319 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 PA |
320 | { |
321 | char file[MAXPATHLEN]; | |
322 | ||
323 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 324 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
325 | } |
326 | ||
bd99dc85 PA |
327 | static void |
328 | delete_lwp (struct lwp_info *lwp) | |
329 | { | |
330 | remove_thread (get_lwp_thread (lwp)); | |
331 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 332 | free (lwp->arch_private); |
bd99dc85 PA |
333 | free (lwp); |
334 | } | |
335 | ||
95954743 PA |
336 | /* Add a process to the common process list, and set its private |
337 | data. */ | |
338 | ||
339 | static struct process_info * | |
340 | linux_add_process (int pid, int attached) | |
341 | { | |
342 | struct process_info *proc; | |
343 | ||
344 | /* Is this the first process? If so, then set the arch. */ | |
345 | if (all_processes.head == NULL) | |
346 | new_inferior = 1; | |
347 | ||
348 | proc = add_process (pid, attached); | |
349 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
350 | ||
aa5ca48f DE |
351 | if (the_low_target.new_process != NULL) |
352 | proc->private->arch_private = the_low_target.new_process (); | |
353 | ||
95954743 PA |
354 | return proc; |
355 | } | |
356 | ||
07d4f67e DE |
357 | /* Wrapper function for waitpid which handles EINTR, and emulates |
358 | __WALL for systems where that is not available. */ | |
359 | ||
360 | static int | |
361 | my_waitpid (int pid, int *status, int flags) | |
362 | { | |
363 | int ret, out_errno; | |
364 | ||
365 | if (debug_threads) | |
366 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
367 | ||
368 | if (flags & __WALL) | |
369 | { | |
370 | sigset_t block_mask, org_mask, wake_mask; | |
371 | int wnohang; | |
372 | ||
373 | wnohang = (flags & WNOHANG) != 0; | |
374 | flags &= ~(__WALL | __WCLONE); | |
375 | flags |= WNOHANG; | |
376 | ||
377 | /* Block all signals while here. This avoids knowing about | |
378 | LinuxThread's signals. */ | |
379 | sigfillset (&block_mask); | |
380 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
381 | ||
382 | /* ... except during the sigsuspend below. */ | |
383 | sigemptyset (&wake_mask); | |
384 | ||
385 | while (1) | |
386 | { | |
387 | /* Since all signals are blocked, there's no need to check | |
388 | for EINTR here. */ | |
389 | ret = waitpid (pid, status, flags); | |
390 | out_errno = errno; | |
391 | ||
392 | if (ret == -1 && out_errno != ECHILD) | |
393 | break; | |
394 | else if (ret > 0) | |
395 | break; | |
396 | ||
397 | if (flags & __WCLONE) | |
398 | { | |
399 | /* We've tried both flavors now. If WNOHANG is set, | |
400 | there's nothing else to do, just bail out. */ | |
401 | if (wnohang) | |
402 | break; | |
403 | ||
404 | if (debug_threads) | |
405 | fprintf (stderr, "blocking\n"); | |
406 | ||
407 | /* Block waiting for signals. */ | |
408 | sigsuspend (&wake_mask); | |
409 | } | |
410 | ||
411 | flags ^= __WCLONE; | |
412 | } | |
413 | ||
414 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
415 | } | |
416 | else | |
417 | { | |
418 | do | |
419 | ret = waitpid (pid, status, flags); | |
420 | while (ret == -1 && errno == EINTR); | |
421 | out_errno = errno; | |
422 | } | |
423 | ||
424 | if (debug_threads) | |
425 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
426 | pid, flags, status ? *status : -1, ret); | |
427 | ||
428 | errno = out_errno; | |
429 | return ret; | |
430 | } | |
431 | ||
bd99dc85 PA |
432 | /* Handle a GNU/Linux extended wait response. If we see a clone |
433 | event, we need to add the new LWP to our list (and not report the | |
434 | trap to higher layers). */ | |
0d62e5e8 | 435 | |
24a09b5f | 436 | static void |
54a0b537 | 437 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
438 | { |
439 | int event = wstat >> 16; | |
54a0b537 | 440 | struct lwp_info *new_lwp; |
24a09b5f DJ |
441 | |
442 | if (event == PTRACE_EVENT_CLONE) | |
443 | { | |
95954743 | 444 | ptid_t ptid; |
24a09b5f | 445 | unsigned long new_pid; |
05044653 | 446 | int ret, status; |
24a09b5f | 447 | |
bd99dc85 | 448 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
449 | |
450 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 451 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
452 | { |
453 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
454 | hits the SIGSTOP, but we're already attached. */ | |
455 | ||
97438e3f | 456 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
457 | |
458 | if (ret == -1) | |
459 | perror_with_name ("waiting for new child"); | |
460 | else if (ret != new_pid) | |
461 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 462 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
463 | warning ("wait returned unexpected status 0x%x", status); |
464 | } | |
465 | ||
1e7fc18c | 466 | linux_enable_event_reporting (new_pid); |
24a09b5f | 467 | |
95954743 PA |
468 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
469 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
470 | add_thread (ptid, new_lwp); | |
24a09b5f | 471 | |
e27d73f6 DE |
472 | /* Either we're going to immediately resume the new thread |
473 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
474 | thinks the thread is currently running, so set this first | |
475 | before calling linux_resume_one_lwp. */ | |
476 | new_lwp->stopped = 1; | |
477 | ||
bde24c0a PA |
478 | /* If we're suspending all threads, leave this one suspended |
479 | too. */ | |
480 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
481 | new_lwp->suspended = 1; | |
482 | ||
da5898ce DJ |
483 | /* Normally we will get the pending SIGSTOP. But in some cases |
484 | we might get another signal delivered to the group first. | |
f21cc1a2 | 485 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
486 | if (WSTOPSIG (status) == SIGSTOP) |
487 | { | |
bde24c0a | 488 | if (stopping_threads != NOT_STOPPING_THREADS) |
d50171e4 PA |
489 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
490 | else | |
e27d73f6 | 491 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 492 | } |
24a09b5f | 493 | else |
da5898ce | 494 | { |
54a0b537 | 495 | new_lwp->stop_expected = 1; |
d50171e4 | 496 | |
bde24c0a | 497 | if (stopping_threads != NOT_STOPPING_THREADS) |
da5898ce | 498 | { |
d50171e4 | 499 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
500 | new_lwp->status_pending_p = 1; |
501 | new_lwp->status_pending = status; | |
da5898ce DJ |
502 | } |
503 | else | |
504 | /* Pass the signal on. This is what GDB does - except | |
505 | shouldn't we really report it instead? */ | |
e27d73f6 | 506 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 507 | } |
24a09b5f DJ |
508 | |
509 | /* Always resume the current thread. If we are stopping | |
510 | threads, it will have a pending SIGSTOP; we may as well | |
511 | collect it now. */ | |
2acc282a | 512 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
513 | } |
514 | } | |
515 | ||
d50171e4 PA |
516 | /* Return the PC as read from the regcache of LWP, without any |
517 | adjustment. */ | |
518 | ||
519 | static CORE_ADDR | |
520 | get_pc (struct lwp_info *lwp) | |
521 | { | |
522 | struct thread_info *saved_inferior; | |
523 | struct regcache *regcache; | |
524 | CORE_ADDR pc; | |
525 | ||
526 | if (the_low_target.get_pc == NULL) | |
527 | return 0; | |
528 | ||
529 | saved_inferior = current_inferior; | |
530 | current_inferior = get_lwp_thread (lwp); | |
531 | ||
532 | regcache = get_thread_regcache (current_inferior, 1); | |
533 | pc = (*the_low_target.get_pc) (regcache); | |
534 | ||
535 | if (debug_threads) | |
536 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
537 | ||
538 | current_inferior = saved_inferior; | |
539 | return pc; | |
540 | } | |
541 | ||
542 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
543 | The SIGTRAP could mean several things. |
544 | ||
545 | On i386, where decr_pc_after_break is non-zero: | |
546 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
547 | we will get only the one SIGTRAP (even if the instruction we | |
548 | stepped over was a breakpoint). The value of $eip will be the | |
549 | next instruction. | |
550 | If we continue the process using PTRACE_CONT, we will get a | |
551 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
552 | the instruction after the breakpoint (i.e. needs to be | |
553 | decremented). If we report the SIGTRAP to GDB, we must also | |
554 | report the undecremented PC. If we cancel the SIGTRAP, we | |
555 | must resume at the decremented PC. | |
556 | ||
557 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
558 | with hardware or kernel single-step: | |
559 | If we single-step over a breakpoint instruction, our PC will | |
560 | point at the following instruction. If we continue and hit a | |
561 | breakpoint instruction, our PC will point at the breakpoint | |
562 | instruction. */ | |
563 | ||
564 | static CORE_ADDR | |
d50171e4 | 565 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 566 | { |
d50171e4 PA |
567 | CORE_ADDR stop_pc; |
568 | ||
569 | if (the_low_target.get_pc == NULL) | |
570 | return 0; | |
0d62e5e8 | 571 | |
d50171e4 PA |
572 | stop_pc = get_pc (lwp); |
573 | ||
bdabb078 PA |
574 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
575 | && !lwp->stepping | |
576 | && !lwp->stopped_by_watchpoint | |
577 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
578 | stop_pc -= the_low_target.decr_pc_after_break; |
579 | ||
580 | if (debug_threads) | |
581 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
582 | ||
583 | return stop_pc; | |
0d62e5e8 | 584 | } |
ce3a066d | 585 | |
0d62e5e8 | 586 | static void * |
95954743 | 587 | add_lwp (ptid_t ptid) |
611cb4a5 | 588 | { |
54a0b537 | 589 | struct lwp_info *lwp; |
0d62e5e8 | 590 | |
54a0b537 PA |
591 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
592 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 593 | |
95954743 | 594 | lwp->head.id = ptid; |
0d62e5e8 | 595 | |
aa5ca48f DE |
596 | if (the_low_target.new_thread != NULL) |
597 | lwp->arch_private = the_low_target.new_thread (); | |
598 | ||
54a0b537 | 599 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 600 | |
54a0b537 | 601 | return lwp; |
0d62e5e8 | 602 | } |
611cb4a5 | 603 | |
da6d8c04 DJ |
604 | /* Start an inferior process and returns its pid. |
605 | ALLARGS is a vector of program-name and args. */ | |
606 | ||
ce3a066d DJ |
607 | static int |
608 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 609 | { |
03583c20 UW |
610 | #ifdef HAVE_PERSONALITY |
611 | int personality_orig = 0, personality_set = 0; | |
612 | #endif | |
a6dbe5df | 613 | struct lwp_info *new_lwp; |
da6d8c04 | 614 | int pid; |
95954743 | 615 | ptid_t ptid; |
da6d8c04 | 616 | |
03583c20 UW |
617 | #ifdef HAVE_PERSONALITY |
618 | if (disable_randomization) | |
619 | { | |
620 | errno = 0; | |
621 | personality_orig = personality (0xffffffff); | |
622 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
623 | { | |
624 | personality_set = 1; | |
625 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
626 | } | |
627 | if (errno != 0 || (personality_set | |
628 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
629 | warning ("Error disabling address space randomization: %s", | |
630 | strerror (errno)); | |
631 | } | |
632 | #endif | |
633 | ||
42c81e2a | 634 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
635 | pid = vfork (); |
636 | #else | |
da6d8c04 | 637 | pid = fork (); |
52fb6437 | 638 | #endif |
da6d8c04 DJ |
639 | if (pid < 0) |
640 | perror_with_name ("fork"); | |
641 | ||
642 | if (pid == 0) | |
643 | { | |
644 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
645 | ||
1a981360 | 646 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 647 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 648 | #endif |
0d62e5e8 | 649 | |
a9fa9f7d DJ |
650 | setpgid (0, 0); |
651 | ||
e0f9f062 DE |
652 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
653 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
654 | Also, redirect stdin to /dev/null. */ | |
655 | if (remote_connection_is_stdio ()) | |
656 | { | |
657 | close (0); | |
658 | open ("/dev/null", O_RDONLY); | |
659 | dup2 (2, 1); | |
3e52c33d JK |
660 | if (write (2, "stdin/stdout redirected\n", |
661 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
662 | /* Errors ignored. */; | |
e0f9f062 DE |
663 | } |
664 | ||
2b876972 DJ |
665 | execv (program, allargs); |
666 | if (errno == ENOENT) | |
667 | execvp (program, allargs); | |
da6d8c04 DJ |
668 | |
669 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 670 | strerror (errno)); |
da6d8c04 DJ |
671 | fflush (stderr); |
672 | _exit (0177); | |
673 | } | |
674 | ||
03583c20 UW |
675 | #ifdef HAVE_PERSONALITY |
676 | if (personality_set) | |
677 | { | |
678 | errno = 0; | |
679 | personality (personality_orig); | |
680 | if (errno != 0) | |
681 | warning ("Error restoring address space randomization: %s", | |
682 | strerror (errno)); | |
683 | } | |
684 | #endif | |
685 | ||
95954743 PA |
686 | linux_add_process (pid, 0); |
687 | ||
688 | ptid = ptid_build (pid, pid, 0); | |
689 | new_lwp = add_lwp (ptid); | |
690 | add_thread (ptid, new_lwp); | |
a6dbe5df | 691 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 692 | |
a9fa9f7d | 693 | return pid; |
da6d8c04 DJ |
694 | } |
695 | ||
696 | /* Attach to an inferior process. */ | |
697 | ||
95954743 PA |
698 | static void |
699 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 700 | { |
95954743 | 701 | ptid_t ptid; |
54a0b537 | 702 | struct lwp_info *new_lwp; |
611cb4a5 | 703 | |
95954743 | 704 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 705 | { |
87b0bb13 JK |
706 | struct buffer buffer; |
707 | ||
95954743 | 708 | if (!initial) |
2d717e4f DJ |
709 | { |
710 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 711 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
712 | strerror (errno), errno); |
713 | fflush (stderr); | |
714 | return; | |
715 | } | |
5f572dec JK |
716 | |
717 | /* If we fail to attach to a process, report an error. */ | |
87b0bb13 JK |
718 | buffer_init (&buffer); |
719 | linux_ptrace_attach_warnings (lwpid, &buffer); | |
720 | buffer_grow_str0 (&buffer, ""); | |
721 | error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer), | |
722 | lwpid, strerror (errno), errno); | |
da6d8c04 DJ |
723 | } |
724 | ||
95954743 | 725 | if (initial) |
e3deef73 LM |
726 | /* If lwp is the tgid, we handle adding existing threads later. |
727 | Otherwise we just add lwp without bothering about any other | |
728 | threads. */ | |
95954743 PA |
729 | ptid = ptid_build (lwpid, lwpid, 0); |
730 | else | |
731 | { | |
732 | /* Note that extracting the pid from the current inferior is | |
733 | safe, since we're always called in the context of the same | |
734 | process as this new thread. */ | |
735 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
736 | ptid = ptid_build (pid, lwpid, 0); | |
737 | } | |
24a09b5f | 738 | |
95954743 PA |
739 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
740 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 741 | |
a6dbe5df PA |
742 | /* We need to wait for SIGSTOP before being able to make the next |
743 | ptrace call on this LWP. */ | |
744 | new_lwp->must_set_ptrace_flags = 1; | |
745 | ||
644cebc9 | 746 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
747 | { |
748 | if (debug_threads) | |
749 | fprintf (stderr, | |
750 | "Attached to a stopped process\n"); | |
751 | ||
752 | /* The process is definitely stopped. It is in a job control | |
753 | stop, unless the kernel predates the TASK_STOPPED / | |
754 | TASK_TRACED distinction, in which case it might be in a | |
755 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
756 | can kill it, signal it, et cetera. | |
757 | ||
758 | First make sure there is a pending SIGSTOP. Since we are | |
759 | already attached, the process can not transition from stopped | |
760 | to running without a PTRACE_CONT; so we know this signal will | |
761 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
762 | probably already in the queue (unless this kernel is old | |
763 | enough to use TASK_STOPPED for ptrace stops); but since | |
764 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
765 | kill_lwp (lwpid, SIGSTOP); | |
766 | ||
767 | /* Finally, resume the stopped process. This will deliver the | |
768 | SIGSTOP (or a higher priority signal, just like normal | |
769 | PTRACE_ATTACH), which we'll catch later on. */ | |
770 | ptrace (PTRACE_CONT, lwpid, 0, 0); | |
771 | } | |
772 | ||
0d62e5e8 | 773 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
774 | brings it to a halt. |
775 | ||
776 | There are several cases to consider here: | |
777 | ||
778 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 779 | of a new thread that is being created. |
d50171e4 PA |
780 | In this case we should ignore that SIGSTOP and resume the |
781 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 782 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 783 | resume_continue. |
0e21c1ec DE |
784 | |
785 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
786 | to it via attach_inferior. |
787 | In this case we want the process thread to stop. | |
d50171e4 PA |
788 | This is handled by having linux_attach set last_resume_kind == |
789 | resume_stop after we return. | |
e3deef73 LM |
790 | |
791 | If the pid we are attaching to is also the tgid, we attach to and | |
792 | stop all the existing threads. Otherwise, we attach to pid and | |
793 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
794 | |
795 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
796 | existing threads. |
797 | In this case we want the thread to stop. | |
798 | FIXME: This case is currently not properly handled. | |
799 | We should wait for the SIGSTOP but don't. Things work apparently | |
800 | because enough time passes between when we ptrace (ATTACH) and when | |
801 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
802 | |
803 | On the other hand, if we are currently trying to stop all threads, we | |
804 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 805 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
806 | end of the list, and so the new thread has not yet reached |
807 | wait_for_sigstop (but will). */ | |
d50171e4 | 808 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
809 | } |
810 | ||
95954743 PA |
811 | void |
812 | linux_attach_lwp (unsigned long lwpid) | |
813 | { | |
814 | linux_attach_lwp_1 (lwpid, 0); | |
815 | } | |
816 | ||
e3deef73 LM |
817 | /* Attach to PID. If PID is the tgid, attach to it and all |
818 | of its threads. */ | |
819 | ||
c52daf70 | 820 | static int |
a1928bad | 821 | linux_attach (unsigned long pid) |
0d62e5e8 | 822 | { |
e3deef73 LM |
823 | /* Attach to PID. We will check for other threads |
824 | soon. */ | |
95954743 | 825 | linux_attach_lwp_1 (pid, 1); |
95954743 | 826 | linux_add_process (pid, 1); |
0d62e5e8 | 827 | |
bd99dc85 PA |
828 | if (!non_stop) |
829 | { | |
8336d594 PA |
830 | struct thread_info *thread; |
831 | ||
832 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
833 | process. It will be collected by wait shortly. */ | |
834 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
835 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 836 | } |
0d62e5e8 | 837 | |
e3deef73 LM |
838 | if (linux_proc_get_tgid (pid) == pid) |
839 | { | |
840 | DIR *dir; | |
841 | char pathname[128]; | |
842 | ||
843 | sprintf (pathname, "/proc/%ld/task", pid); | |
844 | ||
845 | dir = opendir (pathname); | |
846 | ||
847 | if (!dir) | |
848 | { | |
849 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
850 | fflush (stderr); | |
851 | } | |
852 | else | |
853 | { | |
854 | /* At this point we attached to the tgid. Scan the task for | |
855 | existing threads. */ | |
856 | unsigned long lwp; | |
857 | int new_threads_found; | |
858 | int iterations = 0; | |
859 | struct dirent *dp; | |
860 | ||
861 | while (iterations < 2) | |
862 | { | |
863 | new_threads_found = 0; | |
864 | /* Add all the other threads. While we go through the | |
865 | threads, new threads may be spawned. Cycle through | |
866 | the list of threads until we have done two iterations without | |
867 | finding new threads. */ | |
868 | while ((dp = readdir (dir)) != NULL) | |
869 | { | |
870 | /* Fetch one lwp. */ | |
871 | lwp = strtoul (dp->d_name, NULL, 10); | |
872 | ||
873 | /* Is this a new thread? */ | |
874 | if (lwp | |
875 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
876 | { | |
877 | linux_attach_lwp_1 (lwp, 0); | |
878 | new_threads_found++; | |
879 | ||
880 | if (debug_threads) | |
881 | fprintf (stderr, "\ | |
882 | Found and attached to new lwp %ld\n", lwp); | |
883 | } | |
884 | } | |
885 | ||
886 | if (!new_threads_found) | |
887 | iterations++; | |
888 | else | |
889 | iterations = 0; | |
890 | ||
891 | rewinddir (dir); | |
892 | } | |
893 | closedir (dir); | |
894 | } | |
895 | } | |
896 | ||
95954743 PA |
897 | return 0; |
898 | } | |
899 | ||
900 | struct counter | |
901 | { | |
902 | int pid; | |
903 | int count; | |
904 | }; | |
905 | ||
906 | static int | |
907 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
908 | { | |
909 | struct counter *counter = args; | |
910 | ||
911 | if (ptid_get_pid (entry->id) == counter->pid) | |
912 | { | |
913 | if (++counter->count > 1) | |
914 | return 1; | |
915 | } | |
d61ddec4 | 916 | |
da6d8c04 DJ |
917 | return 0; |
918 | } | |
919 | ||
95954743 PA |
920 | static int |
921 | last_thread_of_process_p (struct thread_info *thread) | |
922 | { | |
923 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
924 | int pid = ptid_get_pid (ptid); | |
925 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 926 | |
95954743 PA |
927 | return (find_inferior (&all_threads, |
928 | second_thread_of_pid_p, &counter) == NULL); | |
929 | } | |
930 | ||
da84f473 PA |
931 | /* Kill LWP. */ |
932 | ||
933 | static void | |
934 | linux_kill_one_lwp (struct lwp_info *lwp) | |
935 | { | |
936 | int pid = lwpid_of (lwp); | |
937 | ||
938 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
939 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
940 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
941 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
942 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
943 | per process, not one for each thread. But since we still support | |
944 | linuxthreads, and we also support debugging programs using raw | |
945 | clone without CLONE_THREAD, we send one for each thread. For | |
946 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
947 | about some old kernels where PTRACE_KILL might work better | |
948 | (dubious if there are any such, but that's why it's paranoia), so | |
949 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
950 | everywhere. */ | |
951 | ||
952 | errno = 0; | |
953 | kill (pid, SIGKILL); | |
954 | if (debug_threads) | |
955 | fprintf (stderr, | |
956 | "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
957 | target_pid_to_str (ptid_of (lwp)), | |
958 | errno ? strerror (errno) : "OK"); | |
959 | ||
960 | errno = 0; | |
961 | ptrace (PTRACE_KILL, pid, 0, 0); | |
962 | if (debug_threads) | |
963 | fprintf (stderr, | |
964 | "LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
965 | target_pid_to_str (ptid_of (lwp)), | |
966 | errno ? strerror (errno) : "OK"); | |
967 | } | |
968 | ||
969 | /* Callback for `find_inferior'. Kills an lwp of a given process, | |
970 | except the leader. */ | |
95954743 PA |
971 | |
972 | static int | |
da84f473 | 973 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 974 | { |
0d62e5e8 | 975 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 976 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 977 | int wstat; |
95954743 PA |
978 | int pid = * (int *) args; |
979 | ||
980 | if (ptid_get_pid (entry->id) != pid) | |
981 | return 0; | |
0d62e5e8 | 982 | |
fd500816 DJ |
983 | /* We avoid killing the first thread here, because of a Linux kernel (at |
984 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
985 | the children get a chance to be reaped, it will remain a zombie | |
986 | forever. */ | |
95954743 | 987 | |
12b42a12 | 988 | if (lwpid_of (lwp) == pid) |
95954743 PA |
989 | { |
990 | if (debug_threads) | |
991 | fprintf (stderr, "lkop: is last of process %s\n", | |
992 | target_pid_to_str (entry->id)); | |
993 | return 0; | |
994 | } | |
fd500816 | 995 | |
0d62e5e8 DJ |
996 | do |
997 | { | |
da84f473 | 998 | linux_kill_one_lwp (lwp); |
0d62e5e8 DJ |
999 | |
1000 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 1001 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 1002 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
1003 | |
1004 | return 0; | |
da6d8c04 DJ |
1005 | } |
1006 | ||
95954743 PA |
1007 | static int |
1008 | linux_kill (int pid) | |
0d62e5e8 | 1009 | { |
95954743 | 1010 | struct process_info *process; |
54a0b537 | 1011 | struct lwp_info *lwp; |
fd500816 | 1012 | int wstat; |
95954743 | 1013 | int lwpid; |
fd500816 | 1014 | |
95954743 PA |
1015 | process = find_process_pid (pid); |
1016 | if (process == NULL) | |
1017 | return -1; | |
9d606399 | 1018 | |
f9e39928 PA |
1019 | /* If we're killing a running inferior, make sure it is stopped |
1020 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1021 | stop_all_lwps (0, NULL); |
f9e39928 | 1022 | |
da84f473 | 1023 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1024 | |
54a0b537 | 1025 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1026 | thread in the list, so do so now. */ |
95954743 | 1027 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1028 | |
784867a5 | 1029 | if (lwp == NULL) |
fd500816 | 1030 | { |
784867a5 JK |
1031 | if (debug_threads) |
1032 | fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n", | |
1033 | lwpid_of (lwp), pid); | |
1034 | } | |
1035 | else | |
1036 | { | |
1037 | if (debug_threads) | |
1038 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", | |
1039 | lwpid_of (lwp), pid); | |
fd500816 | 1040 | |
784867a5 JK |
1041 | do |
1042 | { | |
da84f473 | 1043 | linux_kill_one_lwp (lwp); |
784867a5 JK |
1044 | |
1045 | /* Make sure it died. The loop is most likely unnecessary. */ | |
1046 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); | |
1047 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
1048 | } | |
2d717e4f | 1049 | |
8336d594 | 1050 | the_target->mourn (process); |
f9e39928 PA |
1051 | |
1052 | /* Since we presently can only stop all lwps of all processes, we | |
1053 | need to unstop lwps of other processes. */ | |
7984d532 | 1054 | unstop_all_lwps (0, NULL); |
95954743 | 1055 | return 0; |
0d62e5e8 DJ |
1056 | } |
1057 | ||
9b224c5e PA |
1058 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1059 | signal the thread last stopped for, which we need to deliver to the | |
1060 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1061 | ||
1062 | static int | |
1063 | get_detach_signal (struct thread_info *thread) | |
1064 | { | |
a493e3e2 | 1065 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1066 | int status; |
1067 | struct lwp_info *lp = get_thread_lwp (thread); | |
1068 | ||
1069 | if (lp->status_pending_p) | |
1070 | status = lp->status_pending; | |
1071 | else | |
1072 | { | |
1073 | /* If the thread had been suspended by gdbserver, and it stopped | |
1074 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1075 | want to deliver that SIGSTOP. */ | |
1076 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1077 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1078 | return 0; |
1079 | ||
1080 | /* Otherwise, we may need to deliver the signal we | |
1081 | intercepted. */ | |
1082 | status = lp->last_status; | |
1083 | } | |
1084 | ||
1085 | if (!WIFSTOPPED (status)) | |
1086 | { | |
1087 | if (debug_threads) | |
1088 | fprintf (stderr, | |
1089 | "GPS: lwp %s hasn't stopped: no pending signal\n", | |
1090 | target_pid_to_str (ptid_of (lp))); | |
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
1095 | if (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1096 | { | |
1097 | if (debug_threads) | |
1098 | fprintf (stderr, | |
1099 | "GPS: lwp %s had stopped with extended " | |
1100 | "status: no pending signal\n", | |
1101 | target_pid_to_str (ptid_of (lp))); | |
1102 | return 0; | |
1103 | } | |
1104 | ||
2ea28649 | 1105 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1106 | |
1107 | if (program_signals_p && !program_signals[signo]) | |
1108 | { | |
1109 | if (debug_threads) | |
1110 | fprintf (stderr, | |
1111 | "GPS: lwp %s had signal %s, but it is in nopass state\n", | |
1112 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1113 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1114 | return 0; |
1115 | } | |
1116 | else if (!program_signals_p | |
1117 | /* If we have no way to know which signals GDB does not | |
1118 | want to have passed to the program, assume | |
1119 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1120 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1121 | { |
1122 | if (debug_threads) | |
1123 | fprintf (stderr, | |
1124 | "GPS: lwp %s had signal %s, " | |
1125 | "but we don't know if we should pass it. Default to not.\n", | |
1126 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1127 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1128 | return 0; |
1129 | } | |
1130 | else | |
1131 | { | |
1132 | if (debug_threads) | |
1133 | fprintf (stderr, | |
1134 | "GPS: lwp %s has pending signal %s: delivering it.\n", | |
1135 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1136 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1137 | |
1138 | return WSTOPSIG (status); | |
1139 | } | |
1140 | } | |
1141 | ||
95954743 PA |
1142 | static int |
1143 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1144 | { |
1145 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1146 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1147 | int pid = * (int *) args; |
9b224c5e | 1148 | int sig; |
95954743 PA |
1149 | |
1150 | if (ptid_get_pid (entry->id) != pid) | |
1151 | return 0; | |
6ad8ae5c | 1152 | |
9b224c5e | 1153 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1154 | if (lwp->stop_expected) |
ae13219e | 1155 | { |
9b224c5e PA |
1156 | if (debug_threads) |
1157 | fprintf (stderr, | |
1158 | "Sending SIGCONT to %s\n", | |
1159 | target_pid_to_str (ptid_of (lwp))); | |
1160 | ||
1161 | kill_lwp (lwpid_of (lwp), SIGCONT); | |
54a0b537 | 1162 | lwp->stop_expected = 0; |
ae13219e DJ |
1163 | } |
1164 | ||
1165 | /* Flush any pending changes to the process's registers. */ | |
1166 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 1167 | get_lwp_thread (lwp)); |
ae13219e | 1168 | |
9b224c5e PA |
1169 | /* Pass on any pending signal for this thread. */ |
1170 | sig = get_detach_signal (thread); | |
1171 | ||
ae13219e | 1172 | /* Finally, let it resume. */ |
82bfbe7e PA |
1173 | if (the_low_target.prepare_to_resume != NULL) |
1174 | the_low_target.prepare_to_resume (lwp); | |
f15f9948 TJB |
1175 | if (ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, |
1176 | (PTRACE_ARG4_TYPE) (long) sig) < 0) | |
9b224c5e PA |
1177 | error (_("Can't detach %s: %s"), |
1178 | target_pid_to_str (ptid_of (lwp)), | |
1179 | strerror (errno)); | |
bd99dc85 PA |
1180 | |
1181 | delete_lwp (lwp); | |
95954743 | 1182 | return 0; |
6ad8ae5c DJ |
1183 | } |
1184 | ||
95954743 PA |
1185 | static int |
1186 | linux_detach (int pid) | |
1187 | { | |
1188 | struct process_info *process; | |
1189 | ||
1190 | process = find_process_pid (pid); | |
1191 | if (process == NULL) | |
1192 | return -1; | |
1193 | ||
f9e39928 PA |
1194 | /* Stop all threads before detaching. First, ptrace requires that |
1195 | the thread is stopped to sucessfully detach. Second, thread_db | |
1196 | may need to uninstall thread event breakpoints from memory, which | |
1197 | only works with a stopped process anyway. */ | |
7984d532 | 1198 | stop_all_lwps (0, NULL); |
f9e39928 | 1199 | |
ca5c370d | 1200 | #ifdef USE_THREAD_DB |
8336d594 | 1201 | thread_db_detach (process); |
ca5c370d PA |
1202 | #endif |
1203 | ||
fa593d66 PA |
1204 | /* Stabilize threads (move out of jump pads). */ |
1205 | stabilize_threads (); | |
1206 | ||
95954743 | 1207 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1208 | |
1209 | the_target->mourn (process); | |
f9e39928 PA |
1210 | |
1211 | /* Since we presently can only stop all lwps of all processes, we | |
1212 | need to unstop lwps of other processes. */ | |
7984d532 | 1213 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1214 | return 0; |
1215 | } | |
1216 | ||
1217 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1218 | ||
1219 | static int | |
1220 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1221 | { | |
1222 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1223 | struct process_info *process = proc; | |
1224 | ||
1225 | if (pid_of (lwp) == pid_of (process)) | |
1226 | delete_lwp (lwp); | |
1227 | ||
dd6953e1 | 1228 | return 0; |
6ad8ae5c DJ |
1229 | } |
1230 | ||
8336d594 PA |
1231 | static void |
1232 | linux_mourn (struct process_info *process) | |
1233 | { | |
1234 | struct process_info_private *priv; | |
1235 | ||
1236 | #ifdef USE_THREAD_DB | |
1237 | thread_db_mourn (process); | |
1238 | #endif | |
1239 | ||
f9e39928 PA |
1240 | find_inferior (&all_lwps, delete_lwp_callback, process); |
1241 | ||
8336d594 PA |
1242 | /* Freeing all private data. */ |
1243 | priv = process->private; | |
1244 | free (priv->arch_private); | |
1245 | free (priv); | |
1246 | process->private = NULL; | |
505106cd PA |
1247 | |
1248 | remove_process (process); | |
8336d594 PA |
1249 | } |
1250 | ||
444d6139 | 1251 | static void |
95954743 | 1252 | linux_join (int pid) |
444d6139 | 1253 | { |
444d6139 PA |
1254 | int status, ret; |
1255 | ||
1256 | do { | |
95954743 | 1257 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1258 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1259 | break; | |
1260 | } while (ret != -1 || errno != ECHILD); | |
1261 | } | |
1262 | ||
6ad8ae5c | 1263 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1264 | static int |
95954743 | 1265 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1266 | { |
95954743 PA |
1267 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1268 | ||
1269 | /* We assume we always know if a thread exits. If a whole process | |
1270 | exited but we still haven't been able to report it to GDB, we'll | |
1271 | hold on to the last lwp of the dead process. */ | |
1272 | if (lwp != NULL) | |
1273 | return !lwp->dead; | |
0d62e5e8 DJ |
1274 | else |
1275 | return 0; | |
1276 | } | |
1277 | ||
6bf5e0ba | 1278 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1279 | static int |
d50171e4 | 1280 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1281 | { |
54a0b537 | 1282 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1283 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1284 | struct thread_info *thread; |
95954743 PA |
1285 | |
1286 | /* Check if we're only interested in events from a specific process | |
1287 | or its lwps. */ | |
1288 | if (!ptid_equal (minus_one_ptid, ptid) | |
1289 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
1290 | return 0; | |
0d62e5e8 | 1291 | |
d50171e4 PA |
1292 | thread = get_lwp_thread (lwp); |
1293 | ||
1294 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1295 | report any status pending the LWP may have. */ | |
8336d594 | 1296 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1297 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1298 | return 0; |
0d62e5e8 | 1299 | |
d50171e4 | 1300 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1301 | } |
1302 | ||
95954743 PA |
1303 | static int |
1304 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1305 | { | |
1306 | ptid_t ptid = *(ptid_t *) data; | |
1307 | int lwp; | |
1308 | ||
1309 | if (ptid_get_lwp (ptid) != 0) | |
1310 | lwp = ptid_get_lwp (ptid); | |
1311 | else | |
1312 | lwp = ptid_get_pid (ptid); | |
1313 | ||
1314 | if (ptid_get_lwp (entry->id) == lwp) | |
1315 | return 1; | |
1316 | ||
1317 | return 0; | |
1318 | } | |
1319 | ||
1320 | struct lwp_info * | |
1321 | find_lwp_pid (ptid_t ptid) | |
1322 | { | |
1323 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1324 | } | |
1325 | ||
bd99dc85 | 1326 | static struct lwp_info * |
95954743 | 1327 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1328 | { |
0d62e5e8 | 1329 | int ret; |
95954743 | 1330 | int to_wait_for = -1; |
bd99dc85 | 1331 | struct lwp_info *child = NULL; |
0d62e5e8 | 1332 | |
bd99dc85 | 1333 | if (debug_threads) |
95954743 PA |
1334 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1335 | ||
1336 | if (ptid_equal (ptid, minus_one_ptid)) | |
1337 | to_wait_for = -1; /* any child */ | |
1338 | else | |
1339 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1340 | |
bd99dc85 | 1341 | options |= __WALL; |
0d62e5e8 | 1342 | |
bd99dc85 | 1343 | retry: |
0d62e5e8 | 1344 | |
bd99dc85 PA |
1345 | ret = my_waitpid (to_wait_for, wstatp, options); |
1346 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1347 | return NULL; | |
1348 | else if (ret == -1) | |
1349 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1350 | |
1351 | if (debug_threads | |
1352 | && (!WIFSTOPPED (*wstatp) | |
1353 | || (WSTOPSIG (*wstatp) != 32 | |
1354 | && WSTOPSIG (*wstatp) != 33))) | |
1355 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1356 | ||
95954743 | 1357 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1358 | |
24a09b5f DJ |
1359 | /* If we didn't find a process, one of two things presumably happened: |
1360 | - A process we started and then detached from has exited. Ignore it. | |
1361 | - A process we are controlling has forked and the new child's stop | |
1362 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1363 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f | 1364 | { |
05044653 | 1365 | add_to_pid_list (&stopped_pids, ret, *wstatp); |
24a09b5f DJ |
1366 | goto retry; |
1367 | } | |
bd99dc85 | 1368 | else if (child == NULL) |
24a09b5f DJ |
1369 | goto retry; |
1370 | ||
bd99dc85 | 1371 | child->stopped = 1; |
0d62e5e8 | 1372 | |
bd99dc85 | 1373 | child->last_status = *wstatp; |
32ca6d61 | 1374 | |
d61ddec4 UW |
1375 | /* Architecture-specific setup after inferior is running. |
1376 | This needs to happen after we have attached to the inferior | |
1377 | and it is stopped for the first time, but before we access | |
1378 | any inferior registers. */ | |
1379 | if (new_inferior) | |
1380 | { | |
1381 | the_low_target.arch_setup (); | |
52fa2412 UW |
1382 | #ifdef HAVE_LINUX_REGSETS |
1383 | memset (disabled_regsets, 0, num_regsets); | |
1384 | #endif | |
d61ddec4 UW |
1385 | new_inferior = 0; |
1386 | } | |
1387 | ||
c3adc08c PA |
1388 | /* Fetch the possibly triggered data watchpoint info and store it in |
1389 | CHILD. | |
1390 | ||
1391 | On some archs, like x86, that use debug registers to set | |
1392 | watchpoints, it's possible that the way to know which watched | |
1393 | address trapped, is to check the register that is used to select | |
1394 | which address to watch. Problem is, between setting the | |
1395 | watchpoint and reading back which data address trapped, the user | |
1396 | may change the set of watchpoints, and, as a consequence, GDB | |
1397 | changes the debug registers in the inferior. To avoid reading | |
1398 | back a stale stopped-data-address when that happens, we cache in | |
1399 | LP the fact that a watchpoint trapped, and the corresponding data | |
1400 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1401 | changes the debug registers meanwhile, we have the cached data we | |
1402 | can rely on. */ | |
1403 | ||
1404 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1405 | { | |
1406 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1407 | { | |
1408 | child->stopped_by_watchpoint = 0; | |
1409 | } | |
1410 | else | |
1411 | { | |
1412 | struct thread_info *saved_inferior; | |
1413 | ||
1414 | saved_inferior = current_inferior; | |
1415 | current_inferior = get_lwp_thread (child); | |
1416 | ||
1417 | child->stopped_by_watchpoint | |
1418 | = the_low_target.stopped_by_watchpoint (); | |
1419 | ||
1420 | if (child->stopped_by_watchpoint) | |
1421 | { | |
1422 | if (the_low_target.stopped_data_address != NULL) | |
1423 | child->stopped_data_address | |
1424 | = the_low_target.stopped_data_address (); | |
1425 | else | |
1426 | child->stopped_data_address = 0; | |
1427 | } | |
1428 | ||
1429 | current_inferior = saved_inferior; | |
1430 | } | |
1431 | } | |
1432 | ||
d50171e4 PA |
1433 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1434 | architecture being defined already (so that CHILD has a valid | |
1435 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1436 | not). */ | |
1437 | if (WIFSTOPPED (*wstatp)) | |
1438 | child->stop_pc = get_stop_pc (child); | |
1439 | ||
0d62e5e8 | 1440 | if (debug_threads |
47c0c975 DE |
1441 | && WIFSTOPPED (*wstatp) |
1442 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1443 | { |
896c7fbb | 1444 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1445 | struct regcache *regcache; |
47c0c975 DE |
1446 | CORE_ADDR pc; |
1447 | ||
d50171e4 | 1448 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1449 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1450 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1451 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1452 | current_inferior = saved_inferior; |
0d62e5e8 | 1453 | } |
bd99dc85 PA |
1454 | |
1455 | return child; | |
0d62e5e8 | 1456 | } |
611cb4a5 | 1457 | |
219f2f23 PA |
1458 | /* This function should only be called if the LWP got a SIGTRAP. |
1459 | ||
1460 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1461 | event was handled, 0 otherwise. */ | |
1462 | ||
1463 | static int | |
1464 | handle_tracepoints (struct lwp_info *lwp) | |
1465 | { | |
1466 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1467 | int tpoint_related_event = 0; | |
1468 | ||
7984d532 PA |
1469 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1470 | uninsert tracepoints. To do this, we temporarily pause all | |
1471 | threads, unpatch away, and then unpause threads. We need to make | |
1472 | sure the unpausing doesn't resume LWP too. */ | |
1473 | lwp->suspended++; | |
1474 | ||
219f2f23 PA |
1475 | /* And we need to be sure that any all-threads-stopping doesn't try |
1476 | to move threads out of the jump pads, as it could deadlock the | |
1477 | inferior (LWP could be in the jump pad, maybe even holding the | |
1478 | lock.) */ | |
1479 | ||
1480 | /* Do any necessary step collect actions. */ | |
1481 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1482 | ||
fa593d66 PA |
1483 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1484 | ||
219f2f23 PA |
1485 | /* See if we just hit a tracepoint and do its main collect |
1486 | actions. */ | |
1487 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1488 | ||
7984d532 PA |
1489 | lwp->suspended--; |
1490 | ||
1491 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1492 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1493 | |
219f2f23 PA |
1494 | if (tpoint_related_event) |
1495 | { | |
1496 | if (debug_threads) | |
1497 | fprintf (stderr, "got a tracepoint event\n"); | |
1498 | return 1; | |
1499 | } | |
1500 | ||
1501 | return 0; | |
1502 | } | |
1503 | ||
fa593d66 PA |
1504 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1505 | fast tracepoint. */ | |
1506 | ||
1507 | static int | |
1508 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1509 | struct fast_tpoint_collect_status *status) | |
1510 | { | |
1511 | CORE_ADDR thread_area; | |
1512 | ||
1513 | if (the_low_target.get_thread_area == NULL) | |
1514 | return 0; | |
1515 | ||
1516 | /* Get the thread area address. This is used to recognize which | |
1517 | thread is which when tracing with the in-process agent library. | |
1518 | We don't read anything from the address, and treat it as opaque; | |
1519 | it's the address itself that we assume is unique per-thread. */ | |
1520 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1521 | return 0; | |
1522 | ||
1523 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1524 | } | |
1525 | ||
1526 | /* The reason we resume in the caller, is because we want to be able | |
1527 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1528 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1529 | refuses to resume. */ | |
1530 | ||
1531 | static int | |
1532 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1533 | { | |
1534 | struct thread_info *saved_inferior; | |
1535 | ||
1536 | saved_inferior = current_inferior; | |
1537 | current_inferior = get_lwp_thread (lwp); | |
1538 | ||
1539 | if ((wstat == NULL | |
1540 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1541 | && supports_fast_tracepoints () | |
58b4daa5 | 1542 | && agent_loaded_p ()) |
fa593d66 PA |
1543 | { |
1544 | struct fast_tpoint_collect_status status; | |
1545 | int r; | |
1546 | ||
1547 | if (debug_threads) | |
1548 | fprintf (stderr, "\ | |
1549 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1550 | lwpid_of (lwp)); | |
1551 | ||
1552 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1553 | ||
1554 | if (wstat == NULL | |
1555 | || (WSTOPSIG (*wstat) != SIGILL | |
1556 | && WSTOPSIG (*wstat) != SIGFPE | |
1557 | && WSTOPSIG (*wstat) != SIGSEGV | |
1558 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1559 | { | |
1560 | lwp->collecting_fast_tracepoint = r; | |
1561 | ||
1562 | if (r != 0) | |
1563 | { | |
1564 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1565 | { | |
1566 | /* Haven't executed the original instruction yet. | |
1567 | Set breakpoint there, and wait till it's hit, | |
1568 | then single-step until exiting the jump pad. */ | |
1569 | lwp->exit_jump_pad_bkpt | |
1570 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1571 | } | |
1572 | ||
1573 | if (debug_threads) | |
1574 | fprintf (stderr, "\ | |
1575 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1576 | lwpid_of (lwp)); | |
0cccb683 | 1577 | current_inferior = saved_inferior; |
fa593d66 PA |
1578 | |
1579 | return 1; | |
1580 | } | |
1581 | } | |
1582 | else | |
1583 | { | |
1584 | /* If we get a synchronous signal while collecting, *and* | |
1585 | while executing the (relocated) original instruction, | |
1586 | reset the PC to point at the tpoint address, before | |
1587 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1588 | report the signal to GDB, and pray for the best. */ | |
1589 | ||
1590 | lwp->collecting_fast_tracepoint = 0; | |
1591 | ||
1592 | if (r != 0 | |
1593 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1594 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1595 | { | |
1596 | siginfo_t info; | |
1597 | struct regcache *regcache; | |
1598 | ||
1599 | /* The si_addr on a few signals references the address | |
1600 | of the faulting instruction. Adjust that as | |
1601 | well. */ | |
1602 | if ((WSTOPSIG (*wstat) == SIGILL | |
1603 | || WSTOPSIG (*wstat) == SIGFPE | |
1604 | || WSTOPSIG (*wstat) == SIGBUS | |
1605 | || WSTOPSIG (*wstat) == SIGSEGV) | |
1606 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &info) == 0 | |
1607 | /* Final check just to make sure we don't clobber | |
1608 | the siginfo of non-kernel-sent signals. */ | |
1609 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1610 | { | |
1611 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
1612 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &info); | |
1613 | } | |
1614 | ||
1615 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1616 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1617 | lwp->stop_pc = status.tpoint_addr; | |
1618 | ||
1619 | /* Cancel any fast tracepoint lock this thread was | |
1620 | holding. */ | |
1621 | force_unlock_trace_buffer (); | |
1622 | } | |
1623 | ||
1624 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1625 | { | |
1626 | if (debug_threads) | |
1627 | fprintf (stderr, | |
1628 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1629 | "stopping all threads momentarily.\n"); | |
1630 | ||
1631 | stop_all_lwps (1, lwp); | |
1632 | cancel_breakpoints (); | |
1633 | ||
1634 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1635 | lwp->exit_jump_pad_bkpt = NULL; | |
1636 | ||
1637 | unstop_all_lwps (1, lwp); | |
1638 | ||
1639 | gdb_assert (lwp->suspended >= 0); | |
1640 | } | |
1641 | } | |
1642 | } | |
1643 | ||
1644 | if (debug_threads) | |
1645 | fprintf (stderr, "\ | |
1646 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1647 | lwpid_of (lwp)); | |
0cccb683 YQ |
1648 | |
1649 | current_inferior = saved_inferior; | |
fa593d66 PA |
1650 | return 0; |
1651 | } | |
1652 | ||
1653 | /* Enqueue one signal in the "signals to report later when out of the | |
1654 | jump pad" list. */ | |
1655 | ||
1656 | static void | |
1657 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1658 | { | |
1659 | struct pending_signals *p_sig; | |
1660 | ||
1661 | if (debug_threads) | |
1662 | fprintf (stderr, "\ | |
1663 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1664 | ||
1665 | if (debug_threads) | |
1666 | { | |
1667 | struct pending_signals *sig; | |
1668 | ||
1669 | for (sig = lwp->pending_signals_to_report; | |
1670 | sig != NULL; | |
1671 | sig = sig->prev) | |
1672 | fprintf (stderr, | |
1673 | " Already queued %d\n", | |
1674 | sig->signal); | |
1675 | ||
1676 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1677 | } | |
1678 | ||
1a981360 PA |
1679 | /* Don't enqueue non-RT signals if they are already in the deferred |
1680 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1681 | twice) */ | |
1682 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1683 | { | |
1684 | struct pending_signals *sig; | |
1685 | ||
1686 | for (sig = lwp->pending_signals_to_report; | |
1687 | sig != NULL; | |
1688 | sig = sig->prev) | |
1689 | { | |
1690 | if (sig->signal == WSTOPSIG (*wstat)) | |
1691 | { | |
1692 | if (debug_threads) | |
1693 | fprintf (stderr, | |
1694 | "Not requeuing already queued non-RT signal %d" | |
1695 | " for LWP %ld\n", | |
1696 | sig->signal, | |
1697 | lwpid_of (lwp)); | |
1698 | return; | |
1699 | } | |
1700 | } | |
1701 | } | |
1702 | ||
fa593d66 PA |
1703 | p_sig = xmalloc (sizeof (*p_sig)); |
1704 | p_sig->prev = lwp->pending_signals_to_report; | |
1705 | p_sig->signal = WSTOPSIG (*wstat); | |
1706 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1707 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1708 | ||
1709 | lwp->pending_signals_to_report = p_sig; | |
1710 | } | |
1711 | ||
1712 | /* Dequeue one signal from the "signals to report later when out of | |
1713 | the jump pad" list. */ | |
1714 | ||
1715 | static int | |
1716 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1717 | { | |
1718 | if (lwp->pending_signals_to_report != NULL) | |
1719 | { | |
1720 | struct pending_signals **p_sig; | |
1721 | ||
1722 | p_sig = &lwp->pending_signals_to_report; | |
1723 | while ((*p_sig)->prev != NULL) | |
1724 | p_sig = &(*p_sig)->prev; | |
1725 | ||
1726 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1727 | if ((*p_sig)->info.si_signo != 0) | |
1728 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); | |
1729 | free (*p_sig); | |
1730 | *p_sig = NULL; | |
1731 | ||
1732 | if (debug_threads) | |
1733 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1734 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1735 | ||
1736 | if (debug_threads) | |
1737 | { | |
1738 | struct pending_signals *sig; | |
1739 | ||
1740 | for (sig = lwp->pending_signals_to_report; | |
1741 | sig != NULL; | |
1742 | sig = sig->prev) | |
1743 | fprintf (stderr, | |
1744 | " Still queued %d\n", | |
1745 | sig->signal); | |
1746 | ||
1747 | fprintf (stderr, " (no more queued signals)\n"); | |
1748 | } | |
1749 | ||
1750 | return 1; | |
1751 | } | |
1752 | ||
1753 | return 0; | |
1754 | } | |
1755 | ||
d50171e4 PA |
1756 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1757 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1758 | will handle the current event, eventually we will resume this LWP, | |
1759 | and this breakpoint will trap again. */ | |
1760 | ||
1761 | static int | |
1762 | cancel_breakpoint (struct lwp_info *lwp) | |
1763 | { | |
1764 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1765 | |
1766 | /* There's nothing to do if we don't support breakpoints. */ | |
1767 | if (!supports_breakpoints ()) | |
1768 | return 0; | |
1769 | ||
d50171e4 PA |
1770 | /* breakpoint_at reads from current inferior. */ |
1771 | saved_inferior = current_inferior; | |
1772 | current_inferior = get_lwp_thread (lwp); | |
1773 | ||
1774 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1775 | { | |
1776 | if (debug_threads) | |
1777 | fprintf (stderr, | |
1778 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1779 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1780 | |
1781 | /* Back up the PC if necessary. */ | |
1782 | if (the_low_target.decr_pc_after_break) | |
1783 | { | |
1784 | struct regcache *regcache | |
fc7238bb | 1785 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1786 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1787 | } | |
1788 | ||
1789 | current_inferior = saved_inferior; | |
1790 | return 1; | |
1791 | } | |
1792 | else | |
1793 | { | |
1794 | if (debug_threads) | |
1795 | fprintf (stderr, | |
1796 | "CB: No breakpoint found at %s for [%s]\n", | |
1797 | paddress (lwp->stop_pc), | |
fc7238bb | 1798 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1799 | } |
1800 | ||
1801 | current_inferior = saved_inferior; | |
1802 | return 0; | |
1803 | } | |
1804 | ||
1805 | /* When the event-loop is doing a step-over, this points at the thread | |
1806 | being stepped. */ | |
1807 | ptid_t step_over_bkpt; | |
1808 | ||
bd99dc85 PA |
1809 | /* Wait for an event from child PID. If PID is -1, wait for any |
1810 | child. Store the stop status through the status pointer WSTAT. | |
1811 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1812 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1813 | the stopped child otherwise. */ | |
1814 | ||
0d62e5e8 | 1815 | static int |
d8301ad1 | 1816 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1817 | { |
d50171e4 | 1818 | struct lwp_info *event_child, *requested_child; |
d8301ad1 | 1819 | ptid_t wait_ptid; |
d50171e4 | 1820 | |
d50171e4 PA |
1821 | event_child = NULL; |
1822 | requested_child = NULL; | |
0d62e5e8 | 1823 | |
95954743 | 1824 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1825 | |
e825046f | 1826 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
0d62e5e8 | 1827 | { |
54a0b537 | 1828 | event_child = (struct lwp_info *) |
d50171e4 | 1829 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1830 | if (debug_threads && event_child) |
bd99dc85 | 1831 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1832 | } |
1833 | else | |
1834 | { | |
95954743 | 1835 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1836 | |
bde24c0a | 1837 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
1838 | && requested_child->status_pending_p |
1839 | && requested_child->collecting_fast_tracepoint) | |
1840 | { | |
1841 | enqueue_one_deferred_signal (requested_child, | |
1842 | &requested_child->status_pending); | |
1843 | requested_child->status_pending_p = 0; | |
1844 | requested_child->status_pending = 0; | |
1845 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1846 | } | |
1847 | ||
1848 | if (requested_child->suspended | |
1849 | && requested_child->status_pending_p) | |
1850 | fatal ("requesting an event out of a suspended child?"); | |
1851 | ||
d50171e4 | 1852 | if (requested_child->status_pending_p) |
bd99dc85 | 1853 | event_child = requested_child; |
0d62e5e8 | 1854 | } |
611cb4a5 | 1855 | |
0d62e5e8 DJ |
1856 | if (event_child != NULL) |
1857 | { | |
bd99dc85 PA |
1858 | if (debug_threads) |
1859 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1860 | lwpid_of (event_child), event_child->status_pending); | |
1861 | *wstat = event_child->status_pending; | |
1862 | event_child->status_pending_p = 0; | |
1863 | event_child->status_pending = 0; | |
1864 | current_inferior = get_lwp_thread (event_child); | |
1865 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1866 | } |
1867 | ||
d8301ad1 JK |
1868 | if (ptid_is_pid (ptid)) |
1869 | { | |
1870 | /* A request to wait for a specific tgid. This is not possible | |
1871 | with waitpid, so instead, we wait for any child, and leave | |
1872 | children we're not interested in right now with a pending | |
1873 | status to report later. */ | |
1874 | wait_ptid = minus_one_ptid; | |
1875 | } | |
1876 | else | |
1877 | wait_ptid = ptid; | |
1878 | ||
0d62e5e8 DJ |
1879 | /* We only enter this loop if no process has a pending wait status. Thus |
1880 | any action taken in response to a wait status inside this loop is | |
1881 | responding as soon as we detect the status, not after any pending | |
1882 | events. */ | |
1883 | while (1) | |
1884 | { | |
d8301ad1 | 1885 | event_child = linux_wait_for_lwp (wait_ptid, wstat, options); |
0d62e5e8 | 1886 | |
bd99dc85 | 1887 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1888 | { |
1889 | if (debug_threads) | |
1890 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1891 | return 0; | |
1892 | } | |
0d62e5e8 DJ |
1893 | |
1894 | if (event_child == NULL) | |
1895 | error ("event from unknown child"); | |
611cb4a5 | 1896 | |
d8301ad1 JK |
1897 | if (ptid_is_pid (ptid) |
1898 | && ptid_get_pid (ptid) != ptid_get_pid (ptid_of (event_child))) | |
1899 | { | |
1900 | if (! WIFSTOPPED (*wstat)) | |
1901 | mark_lwp_dead (event_child, *wstat); | |
1902 | else | |
1903 | { | |
1904 | event_child->status_pending_p = 1; | |
1905 | event_child->status_pending = *wstat; | |
1906 | } | |
1907 | continue; | |
1908 | } | |
1909 | ||
bd99dc85 | 1910 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1911 | |
89be2091 | 1912 | /* Check for thread exit. */ |
bd99dc85 | 1913 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1914 | { |
89be2091 | 1915 | if (debug_threads) |
95954743 | 1916 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1917 | |
1918 | /* If the last thread is exiting, just return. */ | |
95954743 | 1919 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1920 | { |
1921 | if (debug_threads) | |
95954743 PA |
1922 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1923 | lwpid_of (event_child)); | |
bd99dc85 PA |
1924 | return lwpid_of (event_child); |
1925 | } | |
89be2091 | 1926 | |
bd99dc85 PA |
1927 | if (!non_stop) |
1928 | { | |
1929 | current_inferior = (struct thread_info *) all_threads.head; | |
1930 | if (debug_threads) | |
1931 | fprintf (stderr, "Current inferior is now %ld\n", | |
1932 | lwpid_of (get_thread_lwp (current_inferior))); | |
1933 | } | |
1934 | else | |
1935 | { | |
1936 | current_inferior = NULL; | |
1937 | if (debug_threads) | |
1938 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1939 | } | |
89be2091 DJ |
1940 | |
1941 | /* If we were waiting for this particular child to do something... | |
1942 | well, it did something. */ | |
bd99dc85 | 1943 | if (requested_child != NULL) |
d50171e4 PA |
1944 | { |
1945 | int lwpid = lwpid_of (event_child); | |
1946 | ||
1947 | /* Cancel the step-over operation --- the thread that | |
1948 | started it is gone. */ | |
1949 | if (finish_step_over (event_child)) | |
7984d532 | 1950 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1951 | delete_lwp (event_child); |
1952 | return lwpid; | |
1953 | } | |
1954 | ||
1955 | delete_lwp (event_child); | |
89be2091 DJ |
1956 | |
1957 | /* Wait for a more interesting event. */ | |
1958 | continue; | |
1959 | } | |
1960 | ||
a6dbe5df PA |
1961 | if (event_child->must_set_ptrace_flags) |
1962 | { | |
1e7fc18c | 1963 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1964 | event_child->must_set_ptrace_flags = 0; |
1965 | } | |
1966 | ||
bd99dc85 PA |
1967 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1968 | && *wstat >> 16 != 0) | |
24a09b5f | 1969 | { |
bd99dc85 | 1970 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1971 | continue; |
1972 | } | |
1973 | ||
d50171e4 PA |
1974 | if (WIFSTOPPED (*wstat) |
1975 | && WSTOPSIG (*wstat) == SIGSTOP | |
1976 | && event_child->stop_expected) | |
1977 | { | |
1978 | int should_stop; | |
1979 | ||
1980 | if (debug_threads) | |
1981 | fprintf (stderr, "Expected stop.\n"); | |
1982 | event_child->stop_expected = 0; | |
1983 | ||
8336d594 | 1984 | should_stop = (current_inferior->last_resume_kind == resume_stop |
bde24c0a | 1985 | || stopping_threads != NOT_STOPPING_THREADS); |
d50171e4 PA |
1986 | |
1987 | if (!should_stop) | |
1988 | { | |
1989 | linux_resume_one_lwp (event_child, | |
1990 | event_child->stepping, 0, NULL); | |
1991 | continue; | |
1992 | } | |
1993 | } | |
1994 | ||
bd99dc85 | 1995 | return lwpid_of (event_child); |
611cb4a5 | 1996 | } |
0d62e5e8 | 1997 | |
611cb4a5 DJ |
1998 | /* NOTREACHED */ |
1999 | return 0; | |
2000 | } | |
2001 | ||
6bf5e0ba PA |
2002 | /* Count the LWP's that have had events. */ |
2003 | ||
2004 | static int | |
2005 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2006 | { | |
2007 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2008 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2009 | int *count = data; |
2010 | ||
2011 | gdb_assert (count != NULL); | |
2012 | ||
2013 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
2014 | should be reported to GDB. */ | |
8336d594 PA |
2015 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2016 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
2017 | && lp->status_pending_p |
2018 | && WIFSTOPPED (lp->status_pending) | |
2019 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2020 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2021 | (*count)++; | |
2022 | ||
2023 | return 0; | |
2024 | } | |
2025 | ||
2026 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2027 | ||
2028 | static int | |
2029 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2030 | { | |
2031 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2032 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 2033 | |
8336d594 PA |
2034 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2035 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2036 | && lp->status_pending_p) |
2037 | return 1; | |
2038 | else | |
2039 | return 0; | |
2040 | } | |
2041 | ||
2042 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2043 | reported to GDB. */ | |
2044 | ||
2045 | static int | |
2046 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2047 | { | |
2048 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2049 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2050 | int *selector = data; |
2051 | ||
2052 | gdb_assert (selector != NULL); | |
2053 | ||
2054 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
2055 | if (thread->last_resume_kind != resume_stop |
2056 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2057 | && lp->status_pending_p |
2058 | && WIFSTOPPED (lp->status_pending) | |
2059 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2060 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2061 | if ((*selector)-- == 0) | |
2062 | return 1; | |
2063 | ||
2064 | return 0; | |
2065 | } | |
2066 | ||
2067 | static int | |
2068 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
2069 | { | |
2070 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2071 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2072 | struct lwp_info *event_lp = data; |
2073 | ||
2074 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2075 | if (lp == event_lp) | |
2076 | return 0; | |
2077 | ||
2078 | /* If a LWP other than the LWP that we're reporting an event for has | |
2079 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2080 | then just arrange for it to hit it again later. We don't keep | |
2081 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2082 | LWP. We will handle the current event, eventually we will resume | |
2083 | all LWPs, and this one will get its breakpoint trap again. | |
2084 | ||
2085 | If we do not do this, then we run the risk that the user will | |
2086 | delete or disable the breakpoint, but the LWP will have already | |
2087 | tripped on it. */ | |
2088 | ||
8336d594 PA |
2089 | if (thread->last_resume_kind != resume_stop |
2090 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2091 | && lp->status_pending_p |
2092 | && WIFSTOPPED (lp->status_pending) | |
2093 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
2094 | && !lp->stepping |
2095 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
2096 | && cancel_breakpoint (lp)) |
2097 | /* Throw away the SIGTRAP. */ | |
2098 | lp->status_pending_p = 0; | |
2099 | ||
2100 | return 0; | |
2101 | } | |
2102 | ||
7984d532 PA |
2103 | static void |
2104 | linux_cancel_breakpoints (void) | |
2105 | { | |
2106 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
2107 | } | |
2108 | ||
6bf5e0ba PA |
2109 | /* Select one LWP out of those that have events pending. */ |
2110 | ||
2111 | static void | |
2112 | select_event_lwp (struct lwp_info **orig_lp) | |
2113 | { | |
2114 | int num_events = 0; | |
2115 | int random_selector; | |
2116 | struct lwp_info *event_lp; | |
2117 | ||
2118 | /* Give preference to any LWP that is being single-stepped. */ | |
2119 | event_lp | |
2120 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2121 | select_singlestep_lwp_callback, NULL); | |
2122 | if (event_lp != NULL) | |
2123 | { | |
2124 | if (debug_threads) | |
2125 | fprintf (stderr, | |
2126 | "SEL: Select single-step %s\n", | |
2127 | target_pid_to_str (ptid_of (event_lp))); | |
2128 | } | |
2129 | else | |
2130 | { | |
2131 | /* No single-stepping LWP. Select one at random, out of those | |
2132 | which have had SIGTRAP events. */ | |
2133 | ||
2134 | /* First see how many SIGTRAP events we have. */ | |
2135 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
2136 | ||
2137 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2138 | random_selector = (int) | |
2139 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2140 | ||
2141 | if (debug_threads && num_events > 1) | |
2142 | fprintf (stderr, | |
2143 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2144 | num_events, random_selector); | |
2145 | ||
2146 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
2147 | select_event_lwp_callback, | |
2148 | &random_selector); | |
2149 | } | |
2150 | ||
2151 | if (event_lp != NULL) | |
2152 | { | |
2153 | /* Switch the event LWP. */ | |
2154 | *orig_lp = event_lp; | |
2155 | } | |
2156 | } | |
2157 | ||
7984d532 PA |
2158 | /* Decrement the suspend count of an LWP. */ |
2159 | ||
2160 | static int | |
2161 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2162 | { | |
2163 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2164 | ||
2165 | /* Ignore EXCEPT. */ | |
2166 | if (lwp == except) | |
2167 | return 0; | |
2168 | ||
2169 | lwp->suspended--; | |
2170 | ||
2171 | gdb_assert (lwp->suspended >= 0); | |
2172 | return 0; | |
2173 | } | |
2174 | ||
2175 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2176 | NULL. */ | |
2177 | ||
2178 | static void | |
2179 | unsuspend_all_lwps (struct lwp_info *except) | |
2180 | { | |
2181 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
2182 | } | |
2183 | ||
fa593d66 PA |
2184 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2185 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2186 | void *data); | |
2187 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2188 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2189 | struct target_waitstatus *ourstatus, | |
2190 | int target_options); | |
2191 | ||
2192 | /* Stabilize threads (move out of jump pads). | |
2193 | ||
2194 | If a thread is midway collecting a fast tracepoint, we need to | |
2195 | finish the collection and move it out of the jump pad before | |
2196 | reporting the signal. | |
2197 | ||
2198 | This avoids recursion while collecting (when a signal arrives | |
2199 | midway, and the signal handler itself collects), which would trash | |
2200 | the trace buffer. In case the user set a breakpoint in a signal | |
2201 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2202 | Most importantly, there are certain things we can't do safely if | |
2203 | threads are stopped in a jump pad (or in its callee's). For | |
2204 | example: | |
2205 | ||
2206 | - starting a new trace run. A thread still collecting the | |
2207 | previous run, could trash the trace buffer when resumed. The trace | |
2208 | buffer control structures would have been reset but the thread had | |
2209 | no way to tell. The thread could even midway memcpy'ing to the | |
2210 | buffer, which would mean that when resumed, it would clobber the | |
2211 | trace buffer that had been set for a new run. | |
2212 | ||
2213 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2214 | safely. Say you do tstart while a thread is stopped midway while | |
2215 | collecting. When the thread is later resumed, it finishes the | |
2216 | collection, and returns to the jump pad, to execute the original | |
2217 | instruction that was under the tracepoint jump at the time the | |
2218 | older run had been started. If the jump pad had been rewritten | |
2219 | since for something else in the new run, the thread would now | |
2220 | execute the wrong / random instructions. */ | |
2221 | ||
2222 | static void | |
2223 | linux_stabilize_threads (void) | |
2224 | { | |
2225 | struct thread_info *save_inferior; | |
2226 | struct lwp_info *lwp_stuck; | |
2227 | ||
2228 | lwp_stuck | |
2229 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2230 | stuck_in_jump_pad_callback, NULL); | |
2231 | if (lwp_stuck != NULL) | |
2232 | { | |
b4d51a55 PA |
2233 | if (debug_threads) |
2234 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
2235 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2236 | return; |
2237 | } | |
2238 | ||
2239 | save_inferior = current_inferior; | |
2240 | ||
2241 | stabilizing_threads = 1; | |
2242 | ||
2243 | /* Kick 'em all. */ | |
2244 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2245 | ||
2246 | /* Loop until all are stopped out of the jump pads. */ | |
2247 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2248 | { | |
2249 | struct target_waitstatus ourstatus; | |
2250 | struct lwp_info *lwp; | |
fa593d66 PA |
2251 | int wstat; |
2252 | ||
2253 | /* Note that we go through the full wait even loop. While | |
2254 | moving threads out of jump pad, we need to be able to step | |
2255 | over internal breakpoints and such. */ | |
32fcada3 | 2256 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2257 | |
2258 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2259 | { | |
2260 | lwp = get_thread_lwp (current_inferior); | |
2261 | ||
2262 | /* Lock it. */ | |
2263 | lwp->suspended++; | |
2264 | ||
a493e3e2 | 2265 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
fa593d66 PA |
2266 | || current_inferior->last_resume_kind == resume_stop) |
2267 | { | |
2ea28649 | 2268 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2269 | enqueue_one_deferred_signal (lwp, &wstat); |
2270 | } | |
2271 | } | |
2272 | } | |
2273 | ||
2274 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2275 | ||
2276 | stabilizing_threads = 0; | |
2277 | ||
2278 | current_inferior = save_inferior; | |
2279 | ||
b4d51a55 | 2280 | if (debug_threads) |
fa593d66 | 2281 | { |
b4d51a55 PA |
2282 | lwp_stuck |
2283 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2284 | stuck_in_jump_pad_callback, NULL); | |
2285 | if (lwp_stuck != NULL) | |
fa593d66 PA |
2286 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2287 | lwpid_of (lwp_stuck)); | |
2288 | } | |
2289 | } | |
2290 | ||
0d62e5e8 | 2291 | /* Wait for process, returns status. */ |
da6d8c04 | 2292 | |
95954743 PA |
2293 | static ptid_t |
2294 | linux_wait_1 (ptid_t ptid, | |
2295 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2296 | { |
e5f1222d | 2297 | int w; |
fc7238bb | 2298 | struct lwp_info *event_child; |
bd99dc85 | 2299 | int options; |
bd99dc85 | 2300 | int pid; |
6bf5e0ba PA |
2301 | int step_over_finished; |
2302 | int bp_explains_trap; | |
2303 | int maybe_internal_trap; | |
2304 | int report_to_gdb; | |
219f2f23 | 2305 | int trace_event; |
bd99dc85 PA |
2306 | |
2307 | /* Translate generic target options into linux options. */ | |
2308 | options = __WALL; | |
2309 | if (target_options & TARGET_WNOHANG) | |
2310 | options |= WNOHANG; | |
0d62e5e8 DJ |
2311 | |
2312 | retry: | |
fa593d66 PA |
2313 | bp_explains_trap = 0; |
2314 | trace_event = 0; | |
bd99dc85 PA |
2315 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2316 | ||
0d62e5e8 DJ |
2317 | /* If we were only supposed to resume one thread, only wait for |
2318 | that thread - if it's still alive. If it died, however - which | |
2319 | can happen if we're coming from the thread death case below - | |
2320 | then we need to make sure we restart the other threads. We could | |
2321 | pick a thread at random or restart all; restarting all is less | |
2322 | arbitrary. */ | |
95954743 PA |
2323 | if (!non_stop |
2324 | && !ptid_equal (cont_thread, null_ptid) | |
2325 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2326 | { |
fc7238bb PA |
2327 | struct thread_info *thread; |
2328 | ||
bd99dc85 PA |
2329 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2330 | cont_thread); | |
0d62e5e8 DJ |
2331 | |
2332 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2333 | if (thread == NULL) |
64386c31 DJ |
2334 | { |
2335 | struct thread_resume resume_info; | |
95954743 | 2336 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2337 | resume_info.kind = resume_continue; |
2338 | resume_info.sig = 0; | |
2bd7c093 | 2339 | linux_resume (&resume_info, 1); |
64386c31 | 2340 | } |
bd99dc85 | 2341 | else |
95954743 | 2342 | ptid = cont_thread; |
0d62e5e8 | 2343 | } |
da6d8c04 | 2344 | |
6bf5e0ba PA |
2345 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2346 | pid = linux_wait_for_event (ptid, &w, options); | |
2347 | else | |
2348 | { | |
2349 | if (debug_threads) | |
2350 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2351 | target_pid_to_str (step_over_bkpt)); | |
2352 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2353 | } | |
2354 | ||
bd99dc85 | 2355 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2356 | return null_ptid; |
bd99dc85 | 2357 | |
6bf5e0ba | 2358 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2359 | |
0d62e5e8 DJ |
2360 | /* If we are waiting for a particular child, and it exited, |
2361 | linux_wait_for_event will return its exit status. Similarly if | |
2362 | the last child exited. If this is not the last child, however, | |
2363 | do not report it as exited until there is a 'thread exited' response | |
2364 | available in the remote protocol. Instead, just wait for another event. | |
2365 | This should be safe, because if the thread crashed we will already | |
2366 | have reported the termination signal to GDB; that should stop any | |
2367 | in-progress stepping operations, etc. | |
2368 | ||
2369 | Report the exit status of the last thread to exit. This matches | |
2370 | LinuxThreads' behavior. */ | |
2371 | ||
95954743 | 2372 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2373 | { |
bd99dc85 | 2374 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2375 | { |
bd99dc85 PA |
2376 | if (WIFEXITED (w)) |
2377 | { | |
2378 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2379 | ourstatus->value.integer = WEXITSTATUS (w); | |
2380 | ||
2381 | if (debug_threads) | |
493e2a69 MS |
2382 | fprintf (stderr, |
2383 | "\nChild exited with retcode = %x \n", | |
2384 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2385 | } |
2386 | else | |
2387 | { | |
2388 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2ea28649 | 2389 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); |
bd99dc85 PA |
2390 | |
2391 | if (debug_threads) | |
493e2a69 MS |
2392 | fprintf (stderr, |
2393 | "\nChild terminated with signal = %x \n", | |
2394 | WTERMSIG (w)); | |
bd99dc85 PA |
2395 | |
2396 | } | |
5b1c542e | 2397 | |
3e4c1235 | 2398 | return ptid_of (event_child); |
0d62e5e8 | 2399 | } |
da6d8c04 | 2400 | } |
0d62e5e8 | 2401 | else |
da6d8c04 | 2402 | { |
0d62e5e8 DJ |
2403 | if (!WIFSTOPPED (w)) |
2404 | goto retry; | |
da6d8c04 DJ |
2405 | } |
2406 | ||
6bf5e0ba PA |
2407 | /* If this event was not handled before, and is not a SIGTRAP, we |
2408 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2409 | a breakpoint is inserted at the current PC. If this target does | |
2410 | not support internal breakpoints at all, we also report the | |
2411 | SIGTRAP without further processing; it's of no concern to us. */ | |
2412 | maybe_internal_trap | |
2413 | = (supports_breakpoints () | |
2414 | && (WSTOPSIG (w) == SIGTRAP | |
2415 | || ((WSTOPSIG (w) == SIGILL | |
2416 | || WSTOPSIG (w) == SIGSEGV) | |
2417 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2418 | ||
2419 | if (maybe_internal_trap) | |
2420 | { | |
2421 | /* Handle anything that requires bookkeeping before deciding to | |
2422 | report the event or continue waiting. */ | |
2423 | ||
2424 | /* First check if we can explain the SIGTRAP with an internal | |
2425 | breakpoint, or if we should possibly report the event to GDB. | |
2426 | Do this before anything that may remove or insert a | |
2427 | breakpoint. */ | |
2428 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2429 | ||
2430 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2431 | finished. If so, tweak the state machine accordingly, | |
2432 | reinsert breakpoints and delete any reinsert (software | |
2433 | single-step) breakpoints. */ | |
2434 | step_over_finished = finish_step_over (event_child); | |
2435 | ||
2436 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2437 | check_breakpoints (event_child->stop_pc); | |
2438 | ||
219f2f23 PA |
2439 | /* Handle tracepoint data collecting. This may overflow the |
2440 | trace buffer, and cause a tracing stop, removing | |
2441 | breakpoints. */ | |
2442 | trace_event = handle_tracepoints (event_child); | |
2443 | ||
6bf5e0ba PA |
2444 | if (bp_explains_trap) |
2445 | { | |
2446 | /* If we stepped or ran into an internal breakpoint, we've | |
2447 | already handled it. So next time we resume (from this | |
2448 | PC), we should step over it. */ | |
2449 | if (debug_threads) | |
2450 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2451 | ||
8b07ae33 PA |
2452 | if (breakpoint_here (event_child->stop_pc)) |
2453 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2454 | } |
2455 | } | |
2456 | else | |
2457 | { | |
2458 | /* We have some other signal, possibly a step-over dance was in | |
2459 | progress, and it should be cancelled too. */ | |
2460 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2461 | } |
2462 | ||
2463 | /* We have all the data we need. Either report the event to GDB, or | |
2464 | resume threads and keep waiting for more. */ | |
2465 | ||
2466 | /* If we're collecting a fast tracepoint, finish the collection and | |
2467 | move out of the jump pad before delivering a signal. See | |
2468 | linux_stabilize_threads. */ | |
2469 | ||
2470 | if (WIFSTOPPED (w) | |
2471 | && WSTOPSIG (w) != SIGTRAP | |
2472 | && supports_fast_tracepoints () | |
58b4daa5 | 2473 | && agent_loaded_p ()) |
fa593d66 PA |
2474 | { |
2475 | if (debug_threads) | |
2476 | fprintf (stderr, | |
2477 | "Got signal %d for LWP %ld. Check if we need " | |
2478 | "to defer or adjust it.\n", | |
2479 | WSTOPSIG (w), lwpid_of (event_child)); | |
2480 | ||
2481 | /* Allow debugging the jump pad itself. */ | |
2482 | if (current_inferior->last_resume_kind != resume_step | |
2483 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2484 | { | |
2485 | enqueue_one_deferred_signal (event_child, &w); | |
2486 | ||
2487 | if (debug_threads) | |
2488 | fprintf (stderr, | |
2489 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2490 | WSTOPSIG (w), lwpid_of (event_child)); | |
2491 | ||
2492 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2493 | goto retry; | |
2494 | } | |
2495 | } | |
219f2f23 | 2496 | |
fa593d66 PA |
2497 | if (event_child->collecting_fast_tracepoint) |
2498 | { | |
2499 | if (debug_threads) | |
2500 | fprintf (stderr, "\ | |
2501 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2502 | Check if we're already there.\n", | |
2503 | lwpid_of (event_child), | |
2504 | event_child->collecting_fast_tracepoint); | |
2505 | ||
2506 | trace_event = 1; | |
2507 | ||
2508 | event_child->collecting_fast_tracepoint | |
2509 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2510 | ||
2511 | if (event_child->collecting_fast_tracepoint != 1) | |
2512 | { | |
2513 | /* No longer need this breakpoint. */ | |
2514 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2515 | { | |
2516 | if (debug_threads) | |
2517 | fprintf (stderr, | |
2518 | "No longer need exit-jump-pad bkpt; removing it." | |
2519 | "stopping all threads momentarily.\n"); | |
2520 | ||
2521 | /* Other running threads could hit this breakpoint. | |
2522 | We don't handle moribund locations like GDB does, | |
2523 | instead we always pause all threads when removing | |
2524 | breakpoints, so that any step-over or | |
2525 | decr_pc_after_break adjustment is always taken | |
2526 | care of while the breakpoint is still | |
2527 | inserted. */ | |
2528 | stop_all_lwps (1, event_child); | |
2529 | cancel_breakpoints (); | |
2530 | ||
2531 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2532 | event_child->exit_jump_pad_bkpt = NULL; | |
2533 | ||
2534 | unstop_all_lwps (1, event_child); | |
2535 | ||
2536 | gdb_assert (event_child->suspended >= 0); | |
2537 | } | |
2538 | } | |
2539 | ||
2540 | if (event_child->collecting_fast_tracepoint == 0) | |
2541 | { | |
2542 | if (debug_threads) | |
2543 | fprintf (stderr, | |
2544 | "fast tracepoint finished " | |
2545 | "collecting successfully.\n"); | |
2546 | ||
2547 | /* We may have a deferred signal to report. */ | |
2548 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2549 | { | |
2550 | if (debug_threads) | |
2551 | fprintf (stderr, "dequeued one signal.\n"); | |
2552 | } | |
3c11dd79 | 2553 | else |
fa593d66 | 2554 | { |
3c11dd79 PA |
2555 | if (debug_threads) |
2556 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2557 | |
2558 | if (stabilizing_threads) | |
2559 | { | |
2560 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2561 | ourstatus->value.sig = GDB_SIGNAL_0; |
fa593d66 PA |
2562 | return ptid_of (event_child); |
2563 | } | |
2564 | } | |
2565 | } | |
6bf5e0ba PA |
2566 | } |
2567 | ||
e471f25b PA |
2568 | /* Check whether GDB would be interested in this event. */ |
2569 | ||
2570 | /* If GDB is not interested in this signal, don't stop other | |
2571 | threads, and don't report it to GDB. Just resume the inferior | |
2572 | right away. We do this for threading-related signals as well as | |
2573 | any that GDB specifically requested we ignore. But never ignore | |
2574 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2575 | stepping - they may require special handling to skip the signal | |
2576 | handler. */ | |
2577 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2578 | thread library? */ | |
2579 | if (WIFSTOPPED (w) | |
2580 | && current_inferior->last_resume_kind != resume_step | |
2581 | && ( | |
1a981360 | 2582 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2583 | (current_process ()->private->thread_db != NULL |
2584 | && (WSTOPSIG (w) == __SIGRTMIN | |
2585 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2586 | || | |
2587 | #endif | |
2ea28649 | 2588 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b PA |
2589 | && !(WSTOPSIG (w) == SIGSTOP |
2590 | && current_inferior->last_resume_kind == resume_stop)))) | |
2591 | { | |
2592 | siginfo_t info, *info_p; | |
2593 | ||
2594 | if (debug_threads) | |
2595 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2596 | WSTOPSIG (w), lwpid_of (event_child)); | |
2597 | ||
2598 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) | |
2599 | info_p = &info; | |
2600 | else | |
2601 | info_p = NULL; | |
2602 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2603 | WSTOPSIG (w), info_p); | |
2604 | goto retry; | |
2605 | } | |
2606 | ||
2607 | /* If GDB wanted this thread to single step, we always want to | |
2608 | report the SIGTRAP, and let GDB handle it. Watchpoints should | |
2609 | always be reported. So should signals we can't explain. A | |
2610 | SIGTRAP we can't explain could be a GDB breakpoint --- we may or | |
2611 | not support Z0 breakpoints. If we do, we're be able to handle | |
2612 | GDB breakpoints on top of internal breakpoints, by handling the | |
2613 | internal breakpoint and still reporting the event to GDB. If we | |
2614 | don't, we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 2615 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 2616 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 2617 | || event_child->stopped_by_watchpoint |
493e2a69 MS |
2618 | || (!step_over_finished |
2619 | && !bp_explains_trap && !trace_event) | |
9f3a5c85 | 2620 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2621 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2622 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2623 | ||
2624 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2625 | |
2626 | /* We found no reason GDB would want us to stop. We either hit one | |
2627 | of our own breakpoints, or finished an internal step GDB | |
2628 | shouldn't know about. */ | |
2629 | if (!report_to_gdb) | |
2630 | { | |
2631 | if (debug_threads) | |
2632 | { | |
2633 | if (bp_explains_trap) | |
2634 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2635 | if (step_over_finished) | |
2636 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2637 | if (trace_event) |
2638 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
2639 | } |
2640 | ||
2641 | /* We're not reporting this breakpoint to GDB, so apply the | |
2642 | decr_pc_after_break adjustment to the inferior's regcache | |
2643 | ourselves. */ | |
2644 | ||
2645 | if (the_low_target.set_pc != NULL) | |
2646 | { | |
2647 | struct regcache *regcache | |
2648 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2649 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2650 | } | |
2651 | ||
7984d532 PA |
2652 | /* We may have finished stepping over a breakpoint. If so, |
2653 | we've stopped and suspended all LWPs momentarily except the | |
2654 | stepping one. This is where we resume them all again. We're | |
2655 | going to keep waiting, so use proceed, which handles stepping | |
2656 | over the next breakpoint. */ | |
6bf5e0ba PA |
2657 | if (debug_threads) |
2658 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2659 | |
2660 | if (step_over_finished) | |
2661 | unsuspend_all_lwps (event_child); | |
2662 | ||
6bf5e0ba PA |
2663 | proceed_all_lwps (); |
2664 | goto retry; | |
2665 | } | |
2666 | ||
2667 | if (debug_threads) | |
2668 | { | |
8336d594 | 2669 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
2670 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
2671 | if (event_child->stopped_by_watchpoint) | |
2672 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2673 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2674 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2675 | if (debug_threads) |
2676 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2677 | } | |
2678 | ||
2679 | /* Alright, we're going to report a stop. */ | |
2680 | ||
fa593d66 | 2681 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2682 | { |
2683 | /* In all-stop, stop all threads. */ | |
7984d532 | 2684 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2685 | |
2686 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2687 | from among those that have had events. Giving equal priority | |
2688 | to all LWPs that have had events helps prevent | |
2689 | starvation. */ | |
2690 | if (ptid_equal (ptid, minus_one_ptid)) | |
2691 | { | |
2692 | event_child->status_pending_p = 1; | |
2693 | event_child->status_pending = w; | |
2694 | ||
2695 | select_event_lwp (&event_child); | |
2696 | ||
2697 | event_child->status_pending_p = 0; | |
2698 | w = event_child->status_pending; | |
2699 | } | |
2700 | ||
2701 | /* Now that we've selected our final event LWP, cancel any | |
2702 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2703 | See the comment in cancel_breakpoints_callback to find out | |
2704 | why. */ | |
2705 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 | 2706 | |
c03e6ccc YQ |
2707 | /* If we were going a step-over, all other threads but the stepping one |
2708 | had been paused in start_step_over, with their suspend counts | |
2709 | incremented. We don't want to do a full unstop/unpause, because we're | |
2710 | in all-stop mode (so we want threads stopped), but we still need to | |
2711 | unsuspend the other threads, to decrement their `suspended' count | |
2712 | back. */ | |
2713 | if (step_over_finished) | |
2714 | unsuspend_all_lwps (event_child); | |
2715 | ||
fa593d66 PA |
2716 | /* Stabilize threads (move out of jump pads). */ |
2717 | stabilize_threads (); | |
6bf5e0ba PA |
2718 | } |
2719 | else | |
2720 | { | |
2721 | /* If we just finished a step-over, then all threads had been | |
2722 | momentarily paused. In all-stop, that's fine, we want | |
2723 | threads stopped by now anyway. In non-stop, we need to | |
2724 | re-resume threads that GDB wanted to be running. */ | |
2725 | if (step_over_finished) | |
7984d532 | 2726 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2727 | } |
2728 | ||
5b1c542e | 2729 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2730 | |
8336d594 PA |
2731 | if (current_inferior->last_resume_kind == resume_stop |
2732 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2733 | { |
2734 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2735 | and it stopped cleanly, so report as SIG0. The use of | |
2736 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2737 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2738 | } |
8336d594 PA |
2739 | else if (current_inferior->last_resume_kind == resume_stop |
2740 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2741 | { |
2742 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2743 | but, it stopped for other reasons. */ |
2ea28649 | 2744 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2745 | } |
2746 | else | |
2747 | { | |
2ea28649 | 2748 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2749 | } |
2750 | ||
d50171e4 PA |
2751 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2752 | ||
bd99dc85 | 2753 | if (debug_threads) |
95954743 | 2754 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2755 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2756 | ourstatus->kind, |
2757 | ourstatus->value.sig); | |
2758 | ||
6bf5e0ba | 2759 | return ptid_of (event_child); |
bd99dc85 PA |
2760 | } |
2761 | ||
2762 | /* Get rid of any pending event in the pipe. */ | |
2763 | static void | |
2764 | async_file_flush (void) | |
2765 | { | |
2766 | int ret; | |
2767 | char buf; | |
2768 | ||
2769 | do | |
2770 | ret = read (linux_event_pipe[0], &buf, 1); | |
2771 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2772 | } | |
2773 | ||
2774 | /* Put something in the pipe, so the event loop wakes up. */ | |
2775 | static void | |
2776 | async_file_mark (void) | |
2777 | { | |
2778 | int ret; | |
2779 | ||
2780 | async_file_flush (); | |
2781 | ||
2782 | do | |
2783 | ret = write (linux_event_pipe[1], "+", 1); | |
2784 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2785 | ||
2786 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2787 | be awakened anyway. */ | |
2788 | } | |
2789 | ||
95954743 PA |
2790 | static ptid_t |
2791 | linux_wait (ptid_t ptid, | |
2792 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2793 | { |
95954743 | 2794 | ptid_t event_ptid; |
bd99dc85 PA |
2795 | |
2796 | if (debug_threads) | |
95954743 | 2797 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2798 | |
2799 | /* Flush the async file first. */ | |
2800 | if (target_is_async_p ()) | |
2801 | async_file_flush (); | |
2802 | ||
95954743 | 2803 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2804 | |
2805 | /* If at least one stop was reported, there may be more. A single | |
2806 | SIGCHLD can signal more than one child stop. */ | |
2807 | if (target_is_async_p () | |
2808 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2809 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2810 | async_file_mark (); |
2811 | ||
2812 | return event_ptid; | |
da6d8c04 DJ |
2813 | } |
2814 | ||
c5f62d5f | 2815 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2816 | |
2817 | static int | |
a1928bad | 2818 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2819 | { |
c5f62d5f DE |
2820 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2821 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2822 | |
c5f62d5f DE |
2823 | #ifdef __NR_tkill |
2824 | { | |
2825 | static int tkill_failed; | |
fd500816 | 2826 | |
c5f62d5f DE |
2827 | if (!tkill_failed) |
2828 | { | |
2829 | int ret; | |
2830 | ||
2831 | errno = 0; | |
2832 | ret = syscall (__NR_tkill, lwpid, signo); | |
2833 | if (errno != ENOSYS) | |
2834 | return ret; | |
2835 | tkill_failed = 1; | |
2836 | } | |
2837 | } | |
fd500816 DJ |
2838 | #endif |
2839 | ||
2840 | return kill (lwpid, signo); | |
2841 | } | |
2842 | ||
964e4306 PA |
2843 | void |
2844 | linux_stop_lwp (struct lwp_info *lwp) | |
2845 | { | |
2846 | send_sigstop (lwp); | |
2847 | } | |
2848 | ||
0d62e5e8 | 2849 | static void |
02fc4de7 | 2850 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2851 | { |
bd99dc85 | 2852 | int pid; |
0d62e5e8 | 2853 | |
bd99dc85 PA |
2854 | pid = lwpid_of (lwp); |
2855 | ||
0d62e5e8 DJ |
2856 | /* If we already have a pending stop signal for this process, don't |
2857 | send another. */ | |
54a0b537 | 2858 | if (lwp->stop_expected) |
0d62e5e8 | 2859 | { |
ae13219e | 2860 | if (debug_threads) |
bd99dc85 | 2861 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2862 | |
0d62e5e8 DJ |
2863 | return; |
2864 | } | |
2865 | ||
2866 | if (debug_threads) | |
bd99dc85 | 2867 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2868 | |
d50171e4 | 2869 | lwp->stop_expected = 1; |
bd99dc85 | 2870 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2871 | } |
2872 | ||
7984d532 PA |
2873 | static int |
2874 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2875 | { |
2876 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2877 | ||
7984d532 PA |
2878 | /* Ignore EXCEPT. */ |
2879 | if (lwp == except) | |
2880 | return 0; | |
2881 | ||
02fc4de7 | 2882 | if (lwp->stopped) |
7984d532 | 2883 | return 0; |
02fc4de7 PA |
2884 | |
2885 | send_sigstop (lwp); | |
7984d532 PA |
2886 | return 0; |
2887 | } | |
2888 | ||
2889 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2890 | yet. */ | |
2891 | static int | |
2892 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2893 | void *except) | |
2894 | { | |
2895 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2896 | ||
2897 | /* Ignore EXCEPT. */ | |
2898 | if (lwp == except) | |
2899 | return 0; | |
2900 | ||
2901 | lwp->suspended++; | |
2902 | ||
2903 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2904 | } |
2905 | ||
95954743 PA |
2906 | static void |
2907 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2908 | { | |
2909 | /* It's dead, really. */ | |
2910 | lwp->dead = 1; | |
2911 | ||
2912 | /* Store the exit status for later. */ | |
2913 | lwp->status_pending_p = 1; | |
2914 | lwp->status_pending = wstat; | |
2915 | ||
95954743 PA |
2916 | /* Prevent trying to stop it. */ |
2917 | lwp->stopped = 1; | |
2918 | ||
2919 | /* No further stops are expected from a dead lwp. */ | |
2920 | lwp->stop_expected = 0; | |
2921 | } | |
2922 | ||
0d62e5e8 DJ |
2923 | static void |
2924 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2925 | { | |
54a0b537 | 2926 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2927 | struct thread_info *saved_inferior; |
a1928bad | 2928 | int wstat; |
95954743 PA |
2929 | ptid_t saved_tid; |
2930 | ptid_t ptid; | |
d50171e4 | 2931 | int pid; |
0d62e5e8 | 2932 | |
54a0b537 | 2933 | if (lwp->stopped) |
d50171e4 PA |
2934 | { |
2935 | if (debug_threads) | |
2936 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2937 | lwpid_of (lwp)); | |
2938 | return; | |
2939 | } | |
0d62e5e8 DJ |
2940 | |
2941 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2942 | if (saved_inferior != NULL) |
2943 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2944 | else | |
95954743 | 2945 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2946 | |
95954743 | 2947 | ptid = lwp->head.id; |
bd99dc85 | 2948 | |
d50171e4 PA |
2949 | if (debug_threads) |
2950 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2951 | ||
2952 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2953 | |
2954 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2955 | and record the pending SIGSTOP. If the process exited, just | |
2956 | return. */ | |
d50171e4 | 2957 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2958 | { |
2959 | if (debug_threads) | |
d50171e4 PA |
2960 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2961 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2962 | |
d50171e4 | 2963 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2964 | { |
2965 | if (debug_threads) | |
d50171e4 PA |
2966 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2967 | lwpid_of (lwp), wstat); | |
2968 | ||
c35fafde PA |
2969 | lwp->status_pending_p = 1; |
2970 | lwp->status_pending = wstat; | |
2971 | } | |
0d62e5e8 | 2972 | } |
d50171e4 | 2973 | else |
95954743 PA |
2974 | { |
2975 | if (debug_threads) | |
d50171e4 | 2976 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2977 | |
d50171e4 PA |
2978 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2979 | if (lwp) | |
2980 | { | |
2981 | /* Leave this status pending for the next time we're able to | |
2982 | report it. In the mean time, we'll report this lwp as | |
2983 | dead to GDB, so GDB doesn't try to read registers and | |
2984 | memory from it. This can only happen if this was the | |
2985 | last thread of the process; otherwise, PID is removed | |
2986 | from the thread tables before linux_wait_for_event | |
2987 | returns. */ | |
2988 | mark_lwp_dead (lwp, wstat); | |
2989 | } | |
95954743 | 2990 | } |
0d62e5e8 | 2991 | |
bd99dc85 | 2992 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2993 | current_inferior = saved_inferior; |
2994 | else | |
2995 | { | |
2996 | if (debug_threads) | |
2997 | fprintf (stderr, "Previously current thread died.\n"); | |
2998 | ||
bd99dc85 PA |
2999 | if (non_stop) |
3000 | { | |
3001 | /* We can't change the current inferior behind GDB's back, | |
3002 | otherwise, a subsequent command may apply to the wrong | |
3003 | process. */ | |
3004 | current_inferior = NULL; | |
3005 | } | |
3006 | else | |
3007 | { | |
3008 | /* Set a valid thread as current. */ | |
3009 | set_desired_inferior (0); | |
3010 | } | |
0d62e5e8 DJ |
3011 | } |
3012 | } | |
3013 | ||
fa593d66 PA |
3014 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3015 | move it out, because we need to report the stop event to GDB. For | |
3016 | example, if the user puts a breakpoint in the jump pad, it's | |
3017 | because she wants to debug it. */ | |
3018 | ||
3019 | static int | |
3020 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3021 | { | |
3022 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3023 | struct thread_info *thread = get_lwp_thread (lwp); | |
3024 | ||
3025 | gdb_assert (lwp->suspended == 0); | |
3026 | gdb_assert (lwp->stopped); | |
3027 | ||
3028 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3029 | return (supports_fast_tracepoints () | |
58b4daa5 | 3030 | && agent_loaded_p () |
fa593d66 PA |
3031 | && (gdb_breakpoint_here (lwp->stop_pc) |
3032 | || lwp->stopped_by_watchpoint | |
3033 | || thread->last_resume_kind == resume_step) | |
3034 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3035 | } | |
3036 | ||
3037 | static void | |
3038 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3039 | { | |
3040 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3041 | struct thread_info *thread = get_lwp_thread (lwp); | |
3042 | int *wstat; | |
3043 | ||
3044 | gdb_assert (lwp->suspended == 0); | |
3045 | gdb_assert (lwp->stopped); | |
3046 | ||
3047 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3048 | ||
3049 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3050 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
3051 | && !lwp->stopped_by_watchpoint | |
3052 | && thread->last_resume_kind != resume_step | |
3053 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3054 | { | |
3055 | if (debug_threads) | |
3056 | fprintf (stderr, | |
3057 | "LWP %ld needs stabilizing (in jump pad)\n", | |
3058 | lwpid_of (lwp)); | |
3059 | ||
3060 | if (wstat) | |
3061 | { | |
3062 | lwp->status_pending_p = 0; | |
3063 | enqueue_one_deferred_signal (lwp, wstat); | |
3064 | ||
3065 | if (debug_threads) | |
3066 | fprintf (stderr, | |
3067 | "Signal %d for LWP %ld deferred " | |
3068 | "(in jump pad)\n", | |
3069 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
3070 | } | |
3071 | ||
3072 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3073 | } | |
3074 | else | |
3075 | lwp->suspended++; | |
3076 | } | |
3077 | ||
3078 | static int | |
3079 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3080 | { | |
3081 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3082 | ||
3083 | if (lwp->dead) | |
3084 | return 0; | |
3085 | if (lwp->stopped) | |
3086 | return 0; | |
3087 | return 1; | |
3088 | } | |
3089 | ||
7984d532 PA |
3090 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3091 | If SUSPEND, then also increase the suspend count of every LWP, | |
3092 | except EXCEPT. */ | |
3093 | ||
0d62e5e8 | 3094 | static void |
7984d532 | 3095 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3096 | { |
bde24c0a PA |
3097 | /* Should not be called recursively. */ |
3098 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3099 | ||
3100 | stopping_threads = (suspend | |
3101 | ? STOPPING_AND_SUSPENDING_THREADS | |
3102 | : STOPPING_THREADS); | |
7984d532 PA |
3103 | |
3104 | if (suspend) | |
3105 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
3106 | else | |
3107 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 3108 | for_each_inferior (&all_lwps, wait_for_sigstop); |
bde24c0a | 3109 | stopping_threads = NOT_STOPPING_THREADS; |
0d62e5e8 DJ |
3110 | } |
3111 | ||
da6d8c04 DJ |
3112 | /* Resume execution of the inferior process. |
3113 | If STEP is nonzero, single-step it. | |
3114 | If SIGNAL is nonzero, give it that signal. */ | |
3115 | ||
ce3a066d | 3116 | static void |
2acc282a | 3117 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3118 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3119 | { |
0d62e5e8 | 3120 | struct thread_info *saved_inferior; |
fa593d66 | 3121 | int fast_tp_collecting; |
0d62e5e8 | 3122 | |
54a0b537 | 3123 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3124 | return; |
3125 | ||
fa593d66 PA |
3126 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3127 | ||
3128 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3129 | ||
219f2f23 PA |
3130 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3131 | user used the "jump" command, or "set $pc = foo"). */ | |
3132 | if (lwp->stop_pc != get_pc (lwp)) | |
3133 | { | |
3134 | /* Collecting 'while-stepping' actions doesn't make sense | |
3135 | anymore. */ | |
3136 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
3137 | } | |
3138 | ||
0d62e5e8 DJ |
3139 | /* If we have pending signals or status, and a new signal, enqueue the |
3140 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3141 | breakpoint; it will be picked up again below. */ | |
3142 | if (signal != 0 | |
fa593d66 PA |
3143 | && (lwp->status_pending_p |
3144 | || lwp->pending_signals != NULL | |
3145 | || lwp->bp_reinsert != 0 | |
3146 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3147 | { |
3148 | struct pending_signals *p_sig; | |
bca929d3 | 3149 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3150 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3151 | p_sig->signal = signal; |
32ca6d61 DJ |
3152 | if (info == NULL) |
3153 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3154 | else | |
3155 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3156 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3157 | } |
3158 | ||
d50171e4 PA |
3159 | if (lwp->status_pending_p) |
3160 | { | |
3161 | if (debug_threads) | |
3162 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
3163 | " has pending status\n", | |
3164 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
3165 | lwp->stop_expected ? "expected" : "not expected"); | |
3166 | return; | |
3167 | } | |
0d62e5e8 DJ |
3168 | |
3169 | saved_inferior = current_inferior; | |
54a0b537 | 3170 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
3171 | |
3172 | if (debug_threads) | |
1b3f6016 | 3173 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 3174 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 3175 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3176 | |
3177 | /* This bit needs some thinking about. If we get a signal that | |
3178 | we must report while a single-step reinsert is still pending, | |
3179 | we often end up resuming the thread. It might be better to | |
3180 | (ew) allow a stack of pending events; then we could be sure that | |
3181 | the reinsert happened right away and not lose any signals. | |
3182 | ||
3183 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3184 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3185 | complete correctness, so it won't solve that problem. It may be |
3186 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3187 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3188 | { |
3189 | if (debug_threads) | |
d50171e4 PA |
3190 | fprintf (stderr, " pending reinsert at 0x%s\n", |
3191 | paddress (lwp->bp_reinsert)); | |
3192 | ||
3193 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
3194 | { | |
fa593d66 PA |
3195 | if (fast_tp_collecting == 0) |
3196 | { | |
3197 | if (step == 0) | |
3198 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3199 | if (lwp->suspended) | |
3200 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3201 | lwp->suspended); | |
3202 | } | |
d50171e4 PA |
3203 | |
3204 | step = 1; | |
3205 | } | |
0d62e5e8 DJ |
3206 | |
3207 | /* Postpone any pending signal. It was enqueued above. */ | |
3208 | signal = 0; | |
3209 | } | |
3210 | ||
fa593d66 PA |
3211 | if (fast_tp_collecting == 1) |
3212 | { | |
3213 | if (debug_threads) | |
3214 | fprintf (stderr, "\ | |
3215 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
3216 | lwpid_of (lwp)); | |
3217 | ||
3218 | /* Postpone any pending signal. It was enqueued above. */ | |
3219 | signal = 0; | |
3220 | } | |
3221 | else if (fast_tp_collecting == 2) | |
3222 | { | |
3223 | if (debug_threads) | |
3224 | fprintf (stderr, "\ | |
3225 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
3226 | lwpid_of (lwp)); | |
3227 | ||
3228 | if (can_hardware_single_step ()) | |
3229 | step = 1; | |
3230 | else | |
3231 | fatal ("moving out of jump pad single-stepping" | |
3232 | " not implemented on this target"); | |
3233 | ||
3234 | /* Postpone any pending signal. It was enqueued above. */ | |
3235 | signal = 0; | |
3236 | } | |
3237 | ||
219f2f23 PA |
3238 | /* If we have while-stepping actions in this thread set it stepping. |
3239 | If we have a signal to deliver, it may or may not be set to | |
3240 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3241 | while-stepping into a signal handler. A possible smart thing to | |
3242 | do would be to set an internal breakpoint at the signal return | |
3243 | address, continue, and carry on catching this while-stepping | |
3244 | action only when that breakpoint is hit. A future | |
3245 | enhancement. */ | |
3246 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
3247 | && can_hardware_single_step ()) | |
3248 | { | |
3249 | if (debug_threads) | |
3250 | fprintf (stderr, | |
3251 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
3252 | lwpid_of (lwp)); | |
3253 | step = 1; | |
3254 | } | |
3255 | ||
aa691b87 | 3256 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3257 | { |
442ea881 PA |
3258 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3259 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 3260 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3261 | } |
3262 | ||
fa593d66 PA |
3263 | /* If we have pending signals, consume one unless we are trying to |
3264 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3265 | collect. */ | |
3266 | if (lwp->pending_signals != NULL | |
3267 | && lwp->bp_reinsert == 0 | |
3268 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3269 | { |
3270 | struct pending_signals **p_sig; | |
3271 | ||
54a0b537 | 3272 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3273 | while ((*p_sig)->prev != NULL) |
3274 | p_sig = &(*p_sig)->prev; | |
3275 | ||
3276 | signal = (*p_sig)->signal; | |
32ca6d61 | 3277 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 3278 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 3279 | |
0d62e5e8 DJ |
3280 | free (*p_sig); |
3281 | *p_sig = NULL; | |
3282 | } | |
3283 | ||
aa5ca48f DE |
3284 | if (the_low_target.prepare_to_resume != NULL) |
3285 | the_low_target.prepare_to_resume (lwp); | |
3286 | ||
0d62e5e8 | 3287 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 3288 | get_lwp_thread (lwp)); |
da6d8c04 | 3289 | errno = 0; |
54a0b537 | 3290 | lwp->stopped = 0; |
c3adc08c | 3291 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3292 | lwp->stepping = step; |
14ce3065 DE |
3293 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
3294 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3295 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3296 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
3297 | |
3298 | current_inferior = saved_inferior; | |
da6d8c04 | 3299 | if (errno) |
3221518c UW |
3300 | { |
3301 | /* ESRCH from ptrace either means that the thread was already | |
3302 | running (an error) or that it is gone (a race condition). If | |
3303 | it's gone, we will get a notification the next time we wait, | |
3304 | so we can ignore the error. We could differentiate these | |
3305 | two, but it's tricky without waiting; the thread still exists | |
3306 | as a zombie, so sending it signal 0 would succeed. So just | |
3307 | ignore ESRCH. */ | |
3308 | if (errno == ESRCH) | |
3309 | return; | |
3310 | ||
3311 | perror_with_name ("ptrace"); | |
3312 | } | |
da6d8c04 DJ |
3313 | } |
3314 | ||
2bd7c093 PA |
3315 | struct thread_resume_array |
3316 | { | |
3317 | struct thread_resume *resume; | |
3318 | size_t n; | |
3319 | }; | |
64386c31 DJ |
3320 | |
3321 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
3322 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
3323 | resume request. | |
3324 | ||
3325 | This algorithm is O(threads * resume elements), but resume elements | |
3326 | is small (and will remain small at least until GDB supports thread | |
3327 | suspension). */ | |
2bd7c093 PA |
3328 | static int |
3329 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3330 | { |
54a0b537 | 3331 | struct lwp_info *lwp; |
64386c31 | 3332 | struct thread_info *thread; |
5544ad89 | 3333 | int ndx; |
2bd7c093 | 3334 | struct thread_resume_array *r; |
64386c31 DJ |
3335 | |
3336 | thread = (struct thread_info *) entry; | |
54a0b537 | 3337 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3338 | r = arg; |
64386c31 | 3339 | |
2bd7c093 | 3340 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3341 | { |
3342 | ptid_t ptid = r->resume[ndx].thread; | |
3343 | if (ptid_equal (ptid, minus_one_ptid) | |
3344 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3345 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3346 | of PID'. */ | |
3347 | || (ptid_get_pid (ptid) == pid_of (lwp) | |
3348 | && (ptid_is_pid (ptid) | |
3349 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3350 | { |
d50171e4 | 3351 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3352 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3353 | { |
3354 | if (debug_threads) | |
3355 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3356 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3357 | ? "stopped" | |
3358 | : "stopping", | |
3359 | lwpid_of (lwp)); | |
3360 | ||
3361 | continue; | |
3362 | } | |
3363 | ||
95954743 | 3364 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3365 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 PA |
3366 | |
3367 | /* If we had a deferred signal to report, dequeue one now. | |
3368 | This can happen if LWP gets more than one signal while | |
3369 | trying to get out of a jump pad. */ | |
3370 | if (lwp->stopped | |
3371 | && !lwp->status_pending_p | |
3372 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3373 | { | |
3374 | lwp->status_pending_p = 1; | |
3375 | ||
3376 | if (debug_threads) | |
3377 | fprintf (stderr, | |
3378 | "Dequeueing deferred signal %d for LWP %ld, " | |
3379 | "leaving status pending.\n", | |
3380 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3381 | } | |
3382 | ||
95954743 PA |
3383 | return 0; |
3384 | } | |
3385 | } | |
2bd7c093 PA |
3386 | |
3387 | /* No resume action for this thread. */ | |
3388 | lwp->resume = NULL; | |
64386c31 | 3389 | |
2bd7c093 | 3390 | return 0; |
5544ad89 DJ |
3391 | } |
3392 | ||
5544ad89 | 3393 | |
bd99dc85 PA |
3394 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3395 | static int | |
3396 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3397 | { |
bd99dc85 | 3398 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3399 | |
bd99dc85 PA |
3400 | /* LWPs which will not be resumed are not interesting, because |
3401 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3402 | if (lwp->resume == NULL) |
bd99dc85 | 3403 | return 0; |
64386c31 | 3404 | |
bd99dc85 | 3405 | if (lwp->status_pending_p) |
d50171e4 PA |
3406 | * (int *) flag_p = 1; |
3407 | ||
3408 | return 0; | |
3409 | } | |
3410 | ||
3411 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3412 | internal breakpoint that we need to step over. It assumes that any | |
3413 | required STOP_PC adjustment has already been propagated to the | |
3414 | inferior's regcache. */ | |
3415 | ||
3416 | static int | |
3417 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3418 | { | |
3419 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3420 | struct thread_info *thread; |
d50171e4 PA |
3421 | struct thread_info *saved_inferior; |
3422 | CORE_ADDR pc; | |
3423 | ||
3424 | /* LWPs which will not be resumed are not interesting, because we | |
3425 | might not wait for them next time through linux_wait. */ | |
3426 | ||
3427 | if (!lwp->stopped) | |
3428 | { | |
3429 | if (debug_threads) | |
3430 | fprintf (stderr, | |
3431 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3432 | lwpid_of (lwp)); | |
3433 | return 0; | |
3434 | } | |
3435 | ||
8336d594 PA |
3436 | thread = get_lwp_thread (lwp); |
3437 | ||
3438 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3439 | { |
3440 | if (debug_threads) | |
3441 | fprintf (stderr, | |
3442 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3443 | lwpid_of (lwp)); | |
3444 | return 0; | |
3445 | } | |
3446 | ||
7984d532 PA |
3447 | gdb_assert (lwp->suspended >= 0); |
3448 | ||
3449 | if (lwp->suspended) | |
3450 | { | |
3451 | if (debug_threads) | |
3452 | fprintf (stderr, | |
3453 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3454 | lwpid_of (lwp)); | |
3455 | return 0; | |
3456 | } | |
3457 | ||
d50171e4 PA |
3458 | if (!lwp->need_step_over) |
3459 | { | |
3460 | if (debug_threads) | |
3461 | fprintf (stderr, | |
3462 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3463 | } | |
5544ad89 | 3464 | |
bd99dc85 | 3465 | if (lwp->status_pending_p) |
d50171e4 PA |
3466 | { |
3467 | if (debug_threads) | |
3468 | fprintf (stderr, | |
3469 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3470 | lwpid_of (lwp)); | |
3471 | return 0; | |
3472 | } | |
3473 | ||
3474 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3475 | or we have. */ | |
3476 | pc = get_pc (lwp); | |
3477 | ||
3478 | /* If the PC has changed since we stopped, then don't do anything, | |
3479 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3480 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3481 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3482 | command, or poked thread's registers herself. */ | |
3483 | if (pc != lwp->stop_pc) | |
3484 | { | |
3485 | if (debug_threads) | |
3486 | fprintf (stderr, | |
3487 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3488 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3489 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3490 | ||
3491 | lwp->need_step_over = 0; | |
3492 | return 0; | |
3493 | } | |
3494 | ||
3495 | saved_inferior = current_inferior; | |
8336d594 | 3496 | current_inferior = thread; |
d50171e4 | 3497 | |
8b07ae33 | 3498 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3499 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3500 | { |
8b07ae33 | 3501 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3502 | though. If the condition is being evaluated on the target's side |
3503 | and it evaluate to false, step over this breakpoint as well. */ | |
3504 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3505 | && gdb_condition_true_at_breakpoint (pc) |
3506 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3507 | { |
3508 | if (debug_threads) | |
3509 | fprintf (stderr, | |
3510 | "Need step over [LWP %ld]? yes, but found" | |
3511 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3512 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3513 | |
8b07ae33 PA |
3514 | current_inferior = saved_inferior; |
3515 | return 0; | |
3516 | } | |
3517 | else | |
3518 | { | |
3519 | if (debug_threads) | |
3520 | fprintf (stderr, | |
493e2a69 MS |
3521 | "Need step over [LWP %ld]? yes, " |
3522 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3523 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3524 | |
8b07ae33 PA |
3525 | /* We've found an lwp that needs stepping over --- return 1 so |
3526 | that find_inferior stops looking. */ | |
3527 | current_inferior = saved_inferior; | |
3528 | ||
3529 | /* If the step over is cancelled, this is set again. */ | |
3530 | lwp->need_step_over = 0; | |
3531 | return 1; | |
3532 | } | |
d50171e4 PA |
3533 | } |
3534 | ||
3535 | current_inferior = saved_inferior; | |
3536 | ||
3537 | if (debug_threads) | |
3538 | fprintf (stderr, | |
3539 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3540 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3541 | |
bd99dc85 | 3542 | return 0; |
5544ad89 DJ |
3543 | } |
3544 | ||
d50171e4 PA |
3545 | /* Start a step-over operation on LWP. When LWP stopped at a |
3546 | breakpoint, to make progress, we need to remove the breakpoint out | |
3547 | of the way. If we let other threads run while we do that, they may | |
3548 | pass by the breakpoint location and miss hitting it. To avoid | |
3549 | that, a step-over momentarily stops all threads while LWP is | |
3550 | single-stepped while the breakpoint is temporarily uninserted from | |
3551 | the inferior. When the single-step finishes, we reinsert the | |
3552 | breakpoint, and let all threads that are supposed to be running, | |
3553 | run again. | |
3554 | ||
3555 | On targets that don't support hardware single-step, we don't | |
3556 | currently support full software single-stepping. Instead, we only | |
3557 | support stepping over the thread event breakpoint, by asking the | |
3558 | low target where to place a reinsert breakpoint. Since this | |
3559 | routine assumes the breakpoint being stepped over is a thread event | |
3560 | breakpoint, it usually assumes the return address of the current | |
3561 | function is a good enough place to set the reinsert breakpoint. */ | |
3562 | ||
3563 | static int | |
3564 | start_step_over (struct lwp_info *lwp) | |
3565 | { | |
3566 | struct thread_info *saved_inferior; | |
3567 | CORE_ADDR pc; | |
3568 | int step; | |
3569 | ||
3570 | if (debug_threads) | |
3571 | fprintf (stderr, | |
3572 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3573 | lwpid_of (lwp)); | |
3574 | ||
7984d532 PA |
3575 | stop_all_lwps (1, lwp); |
3576 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3577 | |
3578 | if (debug_threads) | |
3579 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3580 | ||
3581 | /* Note, we should always reach here with an already adjusted PC, | |
3582 | either by GDB (if we're resuming due to GDB's request), or by our | |
3583 | caller, if we just finished handling an internal breakpoint GDB | |
3584 | shouldn't care about. */ | |
3585 | pc = get_pc (lwp); | |
3586 | ||
3587 | saved_inferior = current_inferior; | |
3588 | current_inferior = get_lwp_thread (lwp); | |
3589 | ||
3590 | lwp->bp_reinsert = pc; | |
3591 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3592 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3593 | |
3594 | if (can_hardware_single_step ()) | |
3595 | { | |
3596 | step = 1; | |
3597 | } | |
3598 | else | |
3599 | { | |
3600 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3601 | set_reinsert_breakpoint (raddr); | |
3602 | step = 0; | |
3603 | } | |
3604 | ||
3605 | current_inferior = saved_inferior; | |
3606 | ||
3607 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3608 | ||
3609 | /* Require next event from this LWP. */ | |
3610 | step_over_bkpt = lwp->head.id; | |
3611 | return 1; | |
3612 | } | |
3613 | ||
3614 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3615 | start_step_over, if still there, and delete any reinsert | |
3616 | breakpoints we've set, on non hardware single-step targets. */ | |
3617 | ||
3618 | static int | |
3619 | finish_step_over (struct lwp_info *lwp) | |
3620 | { | |
3621 | if (lwp->bp_reinsert != 0) | |
3622 | { | |
3623 | if (debug_threads) | |
3624 | fprintf (stderr, "Finished step over.\n"); | |
3625 | ||
3626 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3627 | may be no breakpoint to reinsert there by now. */ | |
3628 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3629 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3630 | |
3631 | lwp->bp_reinsert = 0; | |
3632 | ||
3633 | /* Delete any software-single-step reinsert breakpoints. No | |
3634 | longer needed. We don't have to worry about other threads | |
3635 | hitting this trap, and later not being able to explain it, | |
3636 | because we were stepping over a breakpoint, and we hold all | |
3637 | threads but LWP stopped while doing that. */ | |
3638 | if (!can_hardware_single_step ()) | |
3639 | delete_reinsert_breakpoints (); | |
3640 | ||
3641 | step_over_bkpt = null_ptid; | |
3642 | return 1; | |
3643 | } | |
3644 | else | |
3645 | return 0; | |
3646 | } | |
3647 | ||
5544ad89 DJ |
3648 | /* This function is called once per thread. We check the thread's resume |
3649 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3650 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3651 | |
bd99dc85 PA |
3652 | For threads which we aren't explicitly told otherwise, we preserve |
3653 | the stepping flag; this is used for stepping over gdbserver-placed | |
3654 | breakpoints. | |
3655 | ||
3656 | If pending_flags was set in any thread, we queue any needed | |
3657 | signals, since we won't actually resume. We already have a pending | |
3658 | event to report, so we don't need to preserve any step requests; | |
3659 | they should be re-issued if necessary. */ | |
3660 | ||
3661 | static int | |
3662 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3663 | { |
54a0b537 | 3664 | struct lwp_info *lwp; |
5544ad89 | 3665 | struct thread_info *thread; |
bd99dc85 | 3666 | int step; |
d50171e4 PA |
3667 | int leave_all_stopped = * (int *) arg; |
3668 | int leave_pending; | |
5544ad89 DJ |
3669 | |
3670 | thread = (struct thread_info *) entry; | |
54a0b537 | 3671 | lwp = get_thread_lwp (thread); |
5544ad89 | 3672 | |
2bd7c093 | 3673 | if (lwp->resume == NULL) |
bd99dc85 | 3674 | return 0; |
5544ad89 | 3675 | |
bd99dc85 | 3676 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3677 | { |
bd99dc85 | 3678 | if (debug_threads) |
d50171e4 | 3679 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3680 | |
3681 | if (!lwp->stopped) | |
3682 | { | |
3683 | if (debug_threads) | |
d50171e4 | 3684 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3685 | |
d50171e4 PA |
3686 | /* Stop the thread, and wait for the event asynchronously, |
3687 | through the event loop. */ | |
02fc4de7 | 3688 | send_sigstop (lwp); |
bd99dc85 PA |
3689 | } |
3690 | else | |
3691 | { | |
3692 | if (debug_threads) | |
d50171e4 PA |
3693 | fprintf (stderr, "already stopped LWP %ld\n", |
3694 | lwpid_of (lwp)); | |
3695 | ||
3696 | /* The LWP may have been stopped in an internal event that | |
3697 | was not meant to be notified back to GDB (e.g., gdbserver | |
3698 | breakpoint), so we should be reporting a stop event in | |
3699 | this case too. */ | |
3700 | ||
3701 | /* If the thread already has a pending SIGSTOP, this is a | |
3702 | no-op. Otherwise, something later will presumably resume | |
3703 | the thread and this will cause it to cancel any pending | |
3704 | operation, due to last_resume_kind == resume_stop. If | |
3705 | the thread already has a pending status to report, we | |
3706 | will still report it the next time we wait - see | |
3707 | status_pending_p_callback. */ | |
1a981360 PA |
3708 | |
3709 | /* If we already have a pending signal to report, then | |
3710 | there's no need to queue a SIGSTOP, as this means we're | |
3711 | midway through moving the LWP out of the jumppad, and we | |
3712 | will report the pending signal as soon as that is | |
3713 | finished. */ | |
3714 | if (lwp->pending_signals_to_report == NULL) | |
3715 | send_sigstop (lwp); | |
bd99dc85 | 3716 | } |
32ca6d61 | 3717 | |
bd99dc85 PA |
3718 | /* For stop requests, we're done. */ |
3719 | lwp->resume = NULL; | |
fc7238bb | 3720 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3721 | return 0; |
5544ad89 DJ |
3722 | } |
3723 | ||
bd99dc85 PA |
3724 | /* If this thread which is about to be resumed has a pending status, |
3725 | then don't resume any threads - we can just report the pending | |
3726 | status. Make sure to queue any signals that would otherwise be | |
3727 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3728 | thread has a pending status. If there's a thread that needs the |
3729 | step-over-breakpoint dance, then don't resume any other thread | |
3730 | but that particular one. */ | |
3731 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3732 | |
d50171e4 | 3733 | if (!leave_pending) |
bd99dc85 PA |
3734 | { |
3735 | if (debug_threads) | |
3736 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3737 | |
d50171e4 | 3738 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3739 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3740 | } |
3741 | else | |
3742 | { | |
3743 | if (debug_threads) | |
3744 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3745 | |
bd99dc85 PA |
3746 | /* If we have a new signal, enqueue the signal. */ |
3747 | if (lwp->resume->sig != 0) | |
3748 | { | |
3749 | struct pending_signals *p_sig; | |
3750 | p_sig = xmalloc (sizeof (*p_sig)); | |
3751 | p_sig->prev = lwp->pending_signals; | |
3752 | p_sig->signal = lwp->resume->sig; | |
3753 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3754 | ||
3755 | /* If this is the same signal we were previously stopped by, | |
3756 | make sure to queue its siginfo. We can ignore the return | |
3757 | value of ptrace; if it fails, we'll skip | |
3758 | PTRACE_SETSIGINFO. */ | |
3759 | if (WIFSTOPPED (lwp->last_status) | |
3760 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
3761 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
3762 | ||
3763 | lwp->pending_signals = p_sig; | |
3764 | } | |
3765 | } | |
5544ad89 | 3766 | |
fc7238bb | 3767 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3768 | lwp->resume = NULL; |
5544ad89 | 3769 | return 0; |
0d62e5e8 DJ |
3770 | } |
3771 | ||
3772 | static void | |
2bd7c093 | 3773 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3774 | { |
2bd7c093 | 3775 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3776 | struct lwp_info *need_step_over = NULL; |
3777 | int any_pending; | |
3778 | int leave_all_stopped; | |
c6ecbae5 | 3779 | |
2bd7c093 | 3780 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3781 | |
d50171e4 PA |
3782 | /* If there is a thread which would otherwise be resumed, which has |
3783 | a pending status, then don't resume any threads - we can just | |
3784 | report the pending status. Make sure to queue any signals that | |
3785 | would otherwise be sent. In non-stop mode, we'll apply this | |
3786 | logic to each thread individually. We consume all pending events | |
3787 | before considering to start a step-over (in all-stop). */ | |
3788 | any_pending = 0; | |
bd99dc85 | 3789 | if (!non_stop) |
d50171e4 PA |
3790 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3791 | ||
3792 | /* If there is a thread which would otherwise be resumed, which is | |
3793 | stopped at a breakpoint that needs stepping over, then don't | |
3794 | resume any threads - have it step over the breakpoint with all | |
3795 | other threads stopped, then resume all threads again. Make sure | |
3796 | to queue any signals that would otherwise be delivered or | |
3797 | queued. */ | |
3798 | if (!any_pending && supports_breakpoints ()) | |
3799 | need_step_over | |
3800 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3801 | need_step_over_p, NULL); | |
3802 | ||
3803 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3804 | ||
3805 | if (debug_threads) | |
3806 | { | |
3807 | if (need_step_over != NULL) | |
3808 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3809 | else if (any_pending) | |
3810 | fprintf (stderr, | |
3811 | "Not resuming, all-stop and found " | |
3812 | "an LWP with pending status\n"); | |
3813 | else | |
3814 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3815 | } | |
3816 | ||
3817 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3818 | otherwise deliver. */ | |
3819 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3820 | ||
3821 | if (need_step_over) | |
3822 | start_step_over (need_step_over); | |
3823 | } | |
3824 | ||
3825 | /* This function is called once per thread. We check the thread's | |
3826 | last resume request, which will tell us whether to resume, step, or | |
3827 | leave the thread stopped. Any signal the client requested to be | |
3828 | delivered has already been enqueued at this point. | |
3829 | ||
3830 | If any thread that GDB wants running is stopped at an internal | |
3831 | breakpoint that needs stepping over, we start a step-over operation | |
3832 | on that particular thread, and leave all others stopped. */ | |
3833 | ||
7984d532 PA |
3834 | static int |
3835 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3836 | { |
7984d532 | 3837 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3838 | struct thread_info *thread; |
d50171e4 PA |
3839 | int step; |
3840 | ||
7984d532 PA |
3841 | if (lwp == except) |
3842 | return 0; | |
d50171e4 PA |
3843 | |
3844 | if (debug_threads) | |
3845 | fprintf (stderr, | |
3846 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3847 | ||
3848 | if (!lwp->stopped) | |
3849 | { | |
3850 | if (debug_threads) | |
3851 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3852 | return 0; |
d50171e4 PA |
3853 | } |
3854 | ||
8336d594 PA |
3855 | thread = get_lwp_thread (lwp); |
3856 | ||
02fc4de7 PA |
3857 | if (thread->last_resume_kind == resume_stop |
3858 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3859 | { |
3860 | if (debug_threads) | |
02fc4de7 PA |
3861 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3862 | lwpid_of (lwp)); | |
7984d532 | 3863 | return 0; |
d50171e4 PA |
3864 | } |
3865 | ||
3866 | if (lwp->status_pending_p) | |
3867 | { | |
3868 | if (debug_threads) | |
3869 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3870 | lwpid_of (lwp)); | |
7984d532 | 3871 | return 0; |
d50171e4 PA |
3872 | } |
3873 | ||
7984d532 PA |
3874 | gdb_assert (lwp->suspended >= 0); |
3875 | ||
d50171e4 PA |
3876 | if (lwp->suspended) |
3877 | { | |
3878 | if (debug_threads) | |
3879 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3880 | return 0; |
d50171e4 PA |
3881 | } |
3882 | ||
1a981360 PA |
3883 | if (thread->last_resume_kind == resume_stop |
3884 | && lwp->pending_signals_to_report == NULL | |
3885 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3886 | { |
3887 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3888 | last_status.kind check above would catch it, and we wouldn't | |
3889 | reach here. This LWP may have been momentarily paused by a | |
3890 | stop_all_lwps call while handling for example, another LWP's | |
3891 | step-over. In that case, the pending expected SIGSTOP signal | |
3892 | that was queued at vCont;t handling time will have already | |
3893 | been consumed by wait_for_sigstop, and so we need to requeue | |
3894 | another one here. Note that if the LWP already has a SIGSTOP | |
3895 | pending, this is a no-op. */ | |
3896 | ||
3897 | if (debug_threads) | |
3898 | fprintf (stderr, | |
3899 | "Client wants LWP %ld to stop. " | |
3900 | "Making sure it has a SIGSTOP pending\n", | |
3901 | lwpid_of (lwp)); | |
3902 | ||
3903 | send_sigstop (lwp); | |
3904 | } | |
3905 | ||
8336d594 | 3906 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3907 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3908 | return 0; |
3909 | } | |
3910 | ||
3911 | static int | |
3912 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3913 | { | |
3914 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3915 | ||
3916 | if (lwp == except) | |
3917 | return 0; | |
3918 | ||
3919 | lwp->suspended--; | |
3920 | gdb_assert (lwp->suspended >= 0); | |
3921 | ||
3922 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3923 | } |
3924 | ||
3925 | /* When we finish a step-over, set threads running again. If there's | |
3926 | another thread that may need a step-over, now's the time to start | |
3927 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3928 | ||
3929 | static void | |
3930 | proceed_all_lwps (void) | |
3931 | { | |
3932 | struct lwp_info *need_step_over; | |
3933 | ||
3934 | /* If there is a thread which would otherwise be resumed, which is | |
3935 | stopped at a breakpoint that needs stepping over, then don't | |
3936 | resume any threads - have it step over the breakpoint with all | |
3937 | other threads stopped, then resume all threads again. */ | |
3938 | ||
3939 | if (supports_breakpoints ()) | |
3940 | { | |
3941 | need_step_over | |
3942 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3943 | need_step_over_p, NULL); | |
3944 | ||
3945 | if (need_step_over != NULL) | |
3946 | { | |
3947 | if (debug_threads) | |
3948 | fprintf (stderr, "proceed_all_lwps: found " | |
3949 | "thread %ld needing a step-over\n", | |
3950 | lwpid_of (need_step_over)); | |
3951 | ||
3952 | start_step_over (need_step_over); | |
3953 | return; | |
3954 | } | |
3955 | } | |
5544ad89 | 3956 | |
d50171e4 PA |
3957 | if (debug_threads) |
3958 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3959 | ||
7984d532 | 3960 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3961 | } |
3962 | ||
3963 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3964 | pending statuses, are set to run again, except for EXCEPT, if not | |
3965 | NULL. This undoes a stop_all_lwps call. */ | |
3966 | ||
3967 | static void | |
7984d532 | 3968 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3969 | { |
5544ad89 DJ |
3970 | if (debug_threads) |
3971 | { | |
d50171e4 PA |
3972 | if (except) |
3973 | fprintf (stderr, | |
3974 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3975 | else |
d50171e4 PA |
3976 | fprintf (stderr, |
3977 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3978 | } |
3979 | ||
7984d532 PA |
3980 | if (unsuspend) |
3981 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3982 | else | |
3983 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3984 | } |
3985 | ||
58caa3dc DJ |
3986 | |
3987 | #ifdef HAVE_LINUX_REGSETS | |
3988 | ||
1faeff08 MR |
3989 | #define use_linux_regsets 1 |
3990 | ||
58caa3dc | 3991 | static int |
442ea881 | 3992 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3993 | { |
3994 | struct regset_info *regset; | |
e9d25b98 | 3995 | int saw_general_regs = 0; |
95954743 | 3996 | int pid; |
1570b33e | 3997 | struct iovec iov; |
58caa3dc DJ |
3998 | |
3999 | regset = target_regsets; | |
4000 | ||
95954743 | 4001 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4002 | while (regset->size >= 0) |
4003 | { | |
1570b33e L |
4004 | void *buf, *data; |
4005 | int nt_type, res; | |
58caa3dc | 4006 | |
52fa2412 | 4007 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
4008 | { |
4009 | regset ++; | |
4010 | continue; | |
4011 | } | |
4012 | ||
bca929d3 | 4013 | buf = xmalloc (regset->size); |
1570b33e L |
4014 | |
4015 | nt_type = regset->nt_type; | |
4016 | if (nt_type) | |
4017 | { | |
4018 | iov.iov_base = buf; | |
4019 | iov.iov_len = regset->size; | |
4020 | data = (void *) &iov; | |
4021 | } | |
4022 | else | |
4023 | data = buf; | |
4024 | ||
dfb64f85 | 4025 | #ifndef __sparc__ |
f15f9948 TJB |
4026 | res = ptrace (regset->get_request, pid, |
4027 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4028 | #else |
1570b33e | 4029 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4030 | #endif |
58caa3dc DJ |
4031 | if (res < 0) |
4032 | { | |
4033 | if (errno == EIO) | |
4034 | { | |
52fa2412 UW |
4035 | /* If we get EIO on a regset, do not try it again for |
4036 | this process. */ | |
4037 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 4038 | free (buf); |
52fa2412 | 4039 | continue; |
58caa3dc DJ |
4040 | } |
4041 | else | |
4042 | { | |
0d62e5e8 | 4043 | char s[256]; |
95954743 PA |
4044 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4045 | pid); | |
0d62e5e8 | 4046 | perror (s); |
58caa3dc DJ |
4047 | } |
4048 | } | |
e9d25b98 DJ |
4049 | else if (regset->type == GENERAL_REGS) |
4050 | saw_general_regs = 1; | |
442ea881 | 4051 | regset->store_function (regcache, buf); |
58caa3dc | 4052 | regset ++; |
fdeb2a12 | 4053 | free (buf); |
58caa3dc | 4054 | } |
e9d25b98 DJ |
4055 | if (saw_general_regs) |
4056 | return 0; | |
4057 | else | |
4058 | return 1; | |
58caa3dc DJ |
4059 | } |
4060 | ||
4061 | static int | |
442ea881 | 4062 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
4063 | { |
4064 | struct regset_info *regset; | |
e9d25b98 | 4065 | int saw_general_regs = 0; |
95954743 | 4066 | int pid; |
1570b33e | 4067 | struct iovec iov; |
58caa3dc DJ |
4068 | |
4069 | regset = target_regsets; | |
4070 | ||
95954743 | 4071 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4072 | while (regset->size >= 0) |
4073 | { | |
1570b33e L |
4074 | void *buf, *data; |
4075 | int nt_type, res; | |
58caa3dc | 4076 | |
52fa2412 | 4077 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
4078 | { |
4079 | regset ++; | |
4080 | continue; | |
4081 | } | |
4082 | ||
bca929d3 | 4083 | buf = xmalloc (regset->size); |
545587ee DJ |
4084 | |
4085 | /* First fill the buffer with the current register set contents, | |
4086 | in case there are any items in the kernel's regset that are | |
4087 | not in gdbserver's regcache. */ | |
1570b33e L |
4088 | |
4089 | nt_type = regset->nt_type; | |
4090 | if (nt_type) | |
4091 | { | |
4092 | iov.iov_base = buf; | |
4093 | iov.iov_len = regset->size; | |
4094 | data = (void *) &iov; | |
4095 | } | |
4096 | else | |
4097 | data = buf; | |
4098 | ||
dfb64f85 | 4099 | #ifndef __sparc__ |
f15f9948 TJB |
4100 | res = ptrace (regset->get_request, pid, |
4101 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4102 | #else |
689cc2ae | 4103 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4104 | #endif |
545587ee DJ |
4105 | |
4106 | if (res == 0) | |
4107 | { | |
4108 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4109 | regset->fill_function (regcache, buf); |
545587ee DJ |
4110 | |
4111 | /* Only now do we write the register set. */ | |
dfb64f85 | 4112 | #ifndef __sparc__ |
f15f9948 TJB |
4113 | res = ptrace (regset->set_request, pid, |
4114 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4115 | #else |
1570b33e | 4116 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4117 | #endif |
545587ee DJ |
4118 | } |
4119 | ||
58caa3dc DJ |
4120 | if (res < 0) |
4121 | { | |
4122 | if (errno == EIO) | |
4123 | { | |
52fa2412 UW |
4124 | /* If we get EIO on a regset, do not try it again for |
4125 | this process. */ | |
4126 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 4127 | free (buf); |
52fa2412 | 4128 | continue; |
58caa3dc | 4129 | } |
3221518c UW |
4130 | else if (errno == ESRCH) |
4131 | { | |
1b3f6016 PA |
4132 | /* At this point, ESRCH should mean the process is |
4133 | already gone, in which case we simply ignore attempts | |
4134 | to change its registers. See also the related | |
4135 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4136 | free (buf); |
3221518c UW |
4137 | return 0; |
4138 | } | |
58caa3dc DJ |
4139 | else |
4140 | { | |
ce3a066d | 4141 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4142 | } |
4143 | } | |
e9d25b98 DJ |
4144 | else if (regset->type == GENERAL_REGS) |
4145 | saw_general_regs = 1; | |
58caa3dc | 4146 | regset ++; |
09ec9b38 | 4147 | free (buf); |
58caa3dc | 4148 | } |
e9d25b98 DJ |
4149 | if (saw_general_regs) |
4150 | return 0; | |
4151 | else | |
4152 | return 1; | |
58caa3dc DJ |
4153 | } |
4154 | ||
1faeff08 | 4155 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4156 | |
1faeff08 MR |
4157 | #define use_linux_regsets 0 |
4158 | #define regsets_fetch_inferior_registers(regcache) 1 | |
4159 | #define regsets_store_inferior_registers(regcache) 1 | |
58caa3dc | 4160 | |
58caa3dc | 4161 | #endif |
1faeff08 MR |
4162 | |
4163 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4164 | calls or 0 if it has to be transferred individually. */ | |
4165 | ||
4166 | static int | |
4167 | linux_register_in_regsets (int regno) | |
4168 | { | |
4169 | unsigned char mask = 1 << (regno % 8); | |
4170 | size_t index = regno / 8; | |
4171 | ||
4172 | return (use_linux_regsets | |
4173 | && (the_low_target.regset_bitmap == NULL | |
4174 | || (the_low_target.regset_bitmap[index] & mask) != 0)); | |
4175 | } | |
4176 | ||
58caa3dc | 4177 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4178 | |
4179 | int | |
4180 | register_addr (int regnum) | |
4181 | { | |
4182 | int addr; | |
4183 | ||
4184 | if (regnum < 0 || regnum >= the_low_target.num_regs) | |
4185 | error ("Invalid register number %d.", regnum); | |
4186 | ||
4187 | addr = the_low_target.regmap[regnum]; | |
4188 | ||
4189 | return addr; | |
4190 | } | |
4191 | ||
4192 | /* Fetch one register. */ | |
4193 | static void | |
4194 | fetch_register (struct regcache *regcache, int regno) | |
4195 | { | |
4196 | CORE_ADDR regaddr; | |
4197 | int i, size; | |
4198 | char *buf; | |
4199 | int pid; | |
4200 | ||
4201 | if (regno >= the_low_target.num_regs) | |
4202 | return; | |
4203 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4204 | return; | |
4205 | ||
4206 | regaddr = register_addr (regno); | |
4207 | if (regaddr == -1) | |
4208 | return; | |
4209 | ||
4210 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4211 | & -sizeof (PTRACE_XFER_TYPE)); | |
4212 | buf = alloca (size); | |
4213 | ||
4214 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4215 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4216 | { | |
4217 | errno = 0; | |
4218 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4219 | ptrace (PTRACE_PEEKUSER, pid, | |
4220 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4221 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
4222 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
4223 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4224 | if (errno != 0) | |
4225 | error ("reading register %d: %s", regno, strerror (errno)); | |
4226 | } | |
4227 | ||
4228 | if (the_low_target.supply_ptrace_register) | |
4229 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4230 | else | |
4231 | supply_register (regcache, regno, buf); | |
4232 | } | |
4233 | ||
4234 | /* Store one register. */ | |
4235 | static void | |
4236 | store_register (struct regcache *regcache, int regno) | |
4237 | { | |
4238 | CORE_ADDR regaddr; | |
4239 | int i, size; | |
4240 | char *buf; | |
4241 | int pid; | |
4242 | ||
4243 | if (regno >= the_low_target.num_regs) | |
4244 | return; | |
4245 | if ((*the_low_target.cannot_store_register) (regno)) | |
4246 | return; | |
4247 | ||
4248 | regaddr = register_addr (regno); | |
4249 | if (regaddr == -1) | |
4250 | return; | |
4251 | ||
4252 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4253 | & -sizeof (PTRACE_XFER_TYPE)); | |
4254 | buf = alloca (size); | |
4255 | memset (buf, 0, size); | |
4256 | ||
4257 | if (the_low_target.collect_ptrace_register) | |
4258 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4259 | else | |
4260 | collect_register (regcache, regno, buf); | |
4261 | ||
4262 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4263 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4264 | { | |
4265 | errno = 0; | |
4266 | ptrace (PTRACE_POKEUSER, pid, | |
4267 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4268 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4269 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
4270 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
4271 | if (errno != 0) | |
4272 | { | |
4273 | /* At this point, ESRCH should mean the process is | |
4274 | already gone, in which case we simply ignore attempts | |
4275 | to change its registers. See also the related | |
4276 | comment in linux_resume_one_lwp. */ | |
4277 | if (errno == ESRCH) | |
4278 | return; | |
4279 | ||
4280 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4281 | error ("writing register %d: %s", regno, strerror (errno)); | |
4282 | } | |
4283 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4284 | } | |
4285 | } | |
4286 | ||
4287 | /* Fetch all registers, or just one, from the child process. | |
4288 | If REGNO is -1, do this for all registers, skipping any that are | |
4289 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4290 | unless ALL is non-zero. | |
4291 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4292 | static void | |
4293 | usr_fetch_inferior_registers (struct regcache *regcache, int regno, int all) | |
4294 | { | |
4295 | if (regno == -1) | |
4296 | { | |
4297 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4298 | if (all || !linux_register_in_regsets (regno)) | |
4299 | fetch_register (regcache, regno); | |
4300 | } | |
4301 | else | |
4302 | fetch_register (regcache, regno); | |
4303 | } | |
4304 | ||
4305 | /* Store our register values back into the inferior. | |
4306 | If REGNO is -1, do this for all registers, skipping any that are | |
4307 | assumed to have been saved by regsets_store_inferior_registers, | |
4308 | unless ALL is non-zero. | |
4309 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4310 | static void | |
4311 | usr_store_inferior_registers (struct regcache *regcache, int regno, int all) | |
4312 | { | |
4313 | if (regno == -1) | |
4314 | { | |
4315 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4316 | if (all || !linux_register_in_regsets (regno)) | |
4317 | store_register (regcache, regno); | |
4318 | } | |
4319 | else | |
4320 | store_register (regcache, regno); | |
4321 | } | |
4322 | ||
4323 | #else /* !HAVE_LINUX_USRREGS */ | |
4324 | ||
4325 | #define usr_fetch_inferior_registers(regcache, regno, all) do {} while (0) | |
4326 | #define usr_store_inferior_registers(regcache, regno, all) do {} while (0) | |
4327 | ||
58caa3dc | 4328 | #endif |
1faeff08 MR |
4329 | |
4330 | ||
4331 | void | |
4332 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4333 | { | |
4334 | int use_regsets; | |
4335 | int all = 0; | |
4336 | ||
4337 | if (regno == -1) | |
4338 | { | |
c14dfd32 PA |
4339 | if (the_low_target.fetch_register != NULL) |
4340 | for (regno = 0; regno < the_low_target.num_regs; regno++) | |
4341 | (*the_low_target.fetch_register) (regcache, regno); | |
4342 | ||
1faeff08 | 4343 | all = regsets_fetch_inferior_registers (regcache); |
c14dfd32 | 4344 | usr_fetch_inferior_registers (regcache, -1, all); |
1faeff08 MR |
4345 | } |
4346 | else | |
4347 | { | |
c14dfd32 PA |
4348 | if (the_low_target.fetch_register != NULL |
4349 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4350 | return; | |
4351 | ||
1faeff08 MR |
4352 | use_regsets = linux_register_in_regsets (regno); |
4353 | if (use_regsets) | |
4354 | all = regsets_fetch_inferior_registers (regcache); | |
4355 | if (!use_regsets || all) | |
4356 | usr_fetch_inferior_registers (regcache, regno, 1); | |
4357 | } | |
58caa3dc DJ |
4358 | } |
4359 | ||
4360 | void | |
442ea881 | 4361 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4362 | { |
1faeff08 MR |
4363 | int use_regsets; |
4364 | int all = 0; | |
4365 | ||
4366 | if (regno == -1) | |
4367 | { | |
4368 | all = regsets_store_inferior_registers (regcache); | |
4369 | usr_store_inferior_registers (regcache, regno, all); | |
4370 | } | |
4371 | else | |
4372 | { | |
4373 | use_regsets = linux_register_in_regsets (regno); | |
4374 | if (use_regsets) | |
4375 | all = regsets_store_inferior_registers (regcache); | |
4376 | if (!use_regsets || all) | |
4377 | usr_store_inferior_registers (regcache, regno, 1); | |
4378 | } | |
58caa3dc DJ |
4379 | } |
4380 | ||
da6d8c04 | 4381 | |
da6d8c04 DJ |
4382 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4383 | to debugger memory starting at MYADDR. */ | |
4384 | ||
c3e735a6 | 4385 | static int |
f450004a | 4386 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4387 | { |
4934b29e MR |
4388 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
4389 | register PTRACE_XFER_TYPE *buffer; | |
4390 | register CORE_ADDR addr; | |
4391 | register int count; | |
4392 | char filename[64]; | |
da6d8c04 | 4393 | register int i; |
4934b29e | 4394 | int ret; |
fd462a61 | 4395 | int fd; |
fd462a61 DJ |
4396 | |
4397 | /* Try using /proc. Don't bother for one word. */ | |
4398 | if (len >= 3 * sizeof (long)) | |
4399 | { | |
4934b29e MR |
4400 | int bytes; |
4401 | ||
fd462a61 DJ |
4402 | /* We could keep this file open and cache it - possibly one per |
4403 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4404 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4405 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4406 | if (fd == -1) | |
4407 | goto no_proc; | |
4408 | ||
4409 | /* If pread64 is available, use it. It's faster if the kernel | |
4410 | supports it (only one syscall), and it's 64-bit safe even on | |
4411 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4412 | application). */ | |
4413 | #ifdef HAVE_PREAD64 | |
4934b29e | 4414 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4415 | #else |
4934b29e MR |
4416 | bytes = -1; |
4417 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4418 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4419 | #endif |
fd462a61 DJ |
4420 | |
4421 | close (fd); | |
4934b29e MR |
4422 | if (bytes == len) |
4423 | return 0; | |
4424 | ||
4425 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4426 | if (bytes > 0) | |
4427 | { | |
4428 | memaddr += bytes; | |
4429 | myaddr += bytes; | |
4430 | len -= bytes; | |
4431 | } | |
fd462a61 | 4432 | } |
da6d8c04 | 4433 | |
fd462a61 | 4434 | no_proc: |
4934b29e MR |
4435 | /* Round starting address down to longword boundary. */ |
4436 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4437 | /* Round ending address up; get number of longwords that makes. */ | |
4438 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4439 | / sizeof (PTRACE_XFER_TYPE)); | |
4440 | /* Allocate buffer of that many longwords. */ | |
4441 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4442 | ||
da6d8c04 | 4443 | /* Read all the longwords */ |
4934b29e | 4444 | errno = 0; |
da6d8c04 DJ |
4445 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4446 | { | |
14ce3065 DE |
4447 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4448 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4449 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
4450 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 | 4451 | if (errno) |
4934b29e | 4452 | break; |
da6d8c04 | 4453 | } |
4934b29e | 4454 | ret = errno; |
da6d8c04 DJ |
4455 | |
4456 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4457 | if (i > 0) |
4458 | { | |
4459 | i *= sizeof (PTRACE_XFER_TYPE); | |
4460 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4461 | memcpy (myaddr, | |
4462 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4463 | i < len ? i : len); | |
4464 | } | |
c3e735a6 | 4465 | |
4934b29e | 4466 | return ret; |
da6d8c04 DJ |
4467 | } |
4468 | ||
93ae6fdc PA |
4469 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4470 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
4471 | returns the value of errno. */ |
4472 | ||
ce3a066d | 4473 | static int |
f450004a | 4474 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4475 | { |
4476 | register int i; | |
4477 | /* Round starting address down to longword boundary. */ | |
4478 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4479 | /* Round ending address up; get number of longwords that makes. */ | |
4480 | register int count | |
493e2a69 MS |
4481 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4482 | / sizeof (PTRACE_XFER_TYPE); | |
4483 | ||
da6d8c04 | 4484 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4485 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4486 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4487 | ||
95954743 | 4488 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4489 | |
0d62e5e8 DJ |
4490 | if (debug_threads) |
4491 | { | |
58d6951d DJ |
4492 | /* Dump up to four bytes. */ |
4493 | unsigned int val = * (unsigned int *) myaddr; | |
4494 | if (len == 1) | |
4495 | val = val & 0xff; | |
4496 | else if (len == 2) | |
4497 | val = val & 0xffff; | |
4498 | else if (len == 3) | |
4499 | val = val & 0xffffff; | |
4500 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4501 | val, (long)memaddr); | |
0d62e5e8 DJ |
4502 | } |
4503 | ||
da6d8c04 DJ |
4504 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4505 | ||
93ae6fdc | 4506 | errno = 0; |
14ce3065 DE |
4507 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4508 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4509 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
4510 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
4511 | if (errno) |
4512 | return errno; | |
da6d8c04 DJ |
4513 | |
4514 | if (count > 1) | |
4515 | { | |
93ae6fdc | 4516 | errno = 0; |
da6d8c04 | 4517 | buffer[count - 1] |
95954743 | 4518 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4519 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4520 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4521 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4522 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 4523 | 0); |
93ae6fdc PA |
4524 | if (errno) |
4525 | return errno; | |
da6d8c04 DJ |
4526 | } |
4527 | ||
93ae6fdc | 4528 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4529 | |
493e2a69 MS |
4530 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4531 | myaddr, len); | |
da6d8c04 DJ |
4532 | |
4533 | /* Write the entire buffer. */ | |
4534 | ||
4535 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4536 | { | |
4537 | errno = 0; | |
14ce3065 DE |
4538 | ptrace (PTRACE_POKETEXT, pid, |
4539 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4540 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4541 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4542 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4543 | if (errno) |
4544 | return errno; | |
4545 | } | |
4546 | ||
4547 | return 0; | |
4548 | } | |
2f2893d9 | 4549 | |
6076632b | 4550 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4551 | static int linux_supports_tracefork_flag; |
4552 | ||
1e7fc18c PA |
4553 | static void |
4554 | linux_enable_event_reporting (int pid) | |
4555 | { | |
4556 | if (!linux_supports_tracefork_flag) | |
4557 | return; | |
4558 | ||
4559 | ptrace (PTRACE_SETOPTIONS, pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
4560 | } | |
4561 | ||
51c2684e | 4562 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4563 | |
51c2684e DJ |
4564 | static int |
4565 | linux_tracefork_grandchild (void *arg) | |
4566 | { | |
4567 | _exit (0); | |
4568 | } | |
4569 | ||
7407e2de AS |
4570 | #define STACK_SIZE 4096 |
4571 | ||
51c2684e DJ |
4572 | static int |
4573 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
4574 | { |
4575 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
4576 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
4577 | |
4578 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4579 | ||
4580 | if (fork () == 0) | |
4581 | linux_tracefork_grandchild (NULL); | |
4582 | ||
4583 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4584 | ||
7407e2de AS |
4585 | #ifdef __ia64__ |
4586 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4587 | CLONE_VM | SIGCHLD, NULL); | |
4588 | #else | |
a1f2ce7d | 4589 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4590 | CLONE_VM | SIGCHLD, NULL); |
4591 | #endif | |
e4b7f41c JK |
4592 | |
4593 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4594 | ||
24a09b5f DJ |
4595 | _exit (0); |
4596 | } | |
4597 | ||
24a09b5f DJ |
4598 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4599 | sure that we can enable the option, and that it had the desired | |
4600 | effect. */ | |
4601 | ||
4602 | static void | |
4603 | linux_test_for_tracefork (void) | |
4604 | { | |
4605 | int child_pid, ret, status; | |
4606 | long second_pid; | |
e4b7f41c | 4607 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4608 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4609 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4610 | |
4611 | linux_supports_tracefork_flag = 0; | |
4612 | ||
e4b7f41c JK |
4613 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4614 | ||
4615 | child_pid = fork (); | |
4616 | if (child_pid == 0) | |
4617 | linux_tracefork_child (NULL); | |
4618 | ||
4619 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4620 | ||
51c2684e | 4621 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4622 | #ifdef __ia64__ |
4623 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4624 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4625 | #else /* !__ia64__ */ |
7407e2de AS |
4626 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4627 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4628 | #endif /* !__ia64__ */ |
4629 | ||
4630 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4631 | ||
24a09b5f | 4632 | if (child_pid == -1) |
51c2684e | 4633 | perror_with_name ("clone"); |
24a09b5f DJ |
4634 | |
4635 | ret = my_waitpid (child_pid, &status, 0); | |
4636 | if (ret == -1) | |
4637 | perror_with_name ("waitpid"); | |
4638 | else if (ret != child_pid) | |
4639 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4640 | if (! WIFSTOPPED (status)) | |
4641 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4642 | ||
14ce3065 DE |
4643 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
4644 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
4645 | if (ret != 0) |
4646 | { | |
4647 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4648 | if (ret != 0) | |
4649 | { | |
4650 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4651 | return; | |
4652 | } | |
4653 | ||
4654 | ret = my_waitpid (child_pid, &status, 0); | |
4655 | if (ret != child_pid) | |
4656 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4657 | else if (!WIFSIGNALED (status)) | |
4658 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4659 | "killed child", status); | |
4660 | ||
4661 | return; | |
4662 | } | |
4663 | ||
4664 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
4665 | if (ret != 0) | |
4666 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4667 | ||
4668 | ret = my_waitpid (child_pid, &status, 0); | |
4669 | ||
4670 | if (ret == child_pid && WIFSTOPPED (status) | |
4671 | && status >> 16 == PTRACE_EVENT_FORK) | |
4672 | { | |
4673 | second_pid = 0; | |
4674 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
4675 | if (ret == 0 && second_pid != 0) | |
4676 | { | |
4677 | int second_status; | |
4678 | ||
4679 | linux_supports_tracefork_flag = 1; | |
4680 | my_waitpid (second_pid, &second_status, 0); | |
4681 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
4682 | if (ret != 0) | |
4683 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4684 | my_waitpid (second_pid, &status, 0); | |
4685 | } | |
4686 | } | |
4687 | else | |
4688 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4689 | "(%d, status 0x%x)", ret, status); | |
4690 | ||
4691 | do | |
4692 | { | |
4693 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4694 | if (ret != 0) | |
4695 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4696 | my_waitpid (child_pid, &status, 0); | |
4697 | } | |
4698 | while (WIFSTOPPED (status)); | |
51c2684e | 4699 | |
e4b7f41c | 4700 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4701 | free (stack); |
e4b7f41c | 4702 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4703 | } |
4704 | ||
4705 | ||
2f2893d9 DJ |
4706 | static void |
4707 | linux_look_up_symbols (void) | |
4708 | { | |
0d62e5e8 | 4709 | #ifdef USE_THREAD_DB |
95954743 PA |
4710 | struct process_info *proc = current_process (); |
4711 | ||
cdbfd419 | 4712 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4713 | return; |
4714 | ||
6076632b DE |
4715 | /* If the kernel supports tracing forks then it also supports tracing |
4716 | clones, and then we don't need to use the magic thread event breakpoint | |
4717 | to learn about threads. */ | |
cdbfd419 | 4718 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4719 | #endif |
4720 | } | |
4721 | ||
e5379b03 | 4722 | static void |
ef57601b | 4723 | linux_request_interrupt (void) |
e5379b03 | 4724 | { |
a1928bad | 4725 | extern unsigned long signal_pid; |
e5379b03 | 4726 | |
95954743 PA |
4727 | if (!ptid_equal (cont_thread, null_ptid) |
4728 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4729 | { |
54a0b537 | 4730 | struct lwp_info *lwp; |
bd99dc85 | 4731 | int lwpid; |
e5379b03 | 4732 | |
54a0b537 | 4733 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4734 | lwpid = lwpid_of (lwp); |
4735 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4736 | } |
4737 | else | |
ef57601b | 4738 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4739 | } |
4740 | ||
aa691b87 RM |
4741 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4742 | to debugger memory starting at MYADDR. */ | |
4743 | ||
4744 | static int | |
f450004a | 4745 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4746 | { |
4747 | char filename[PATH_MAX]; | |
4748 | int fd, n; | |
95954743 | 4749 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4750 | |
6cebaf6e | 4751 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4752 | |
4753 | fd = open (filename, O_RDONLY); | |
4754 | if (fd < 0) | |
4755 | return -1; | |
4756 | ||
4757 | if (offset != (CORE_ADDR) 0 | |
4758 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4759 | n = -1; | |
4760 | else | |
4761 | n = read (fd, myaddr, len); | |
4762 | ||
4763 | close (fd); | |
4764 | ||
4765 | return n; | |
4766 | } | |
4767 | ||
d993e290 PA |
4768 | /* These breakpoint and watchpoint related wrapper functions simply |
4769 | pass on the function call if the target has registered a | |
4770 | corresponding function. */ | |
e013ee27 OF |
4771 | |
4772 | static int | |
d993e290 | 4773 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4774 | { |
d993e290 PA |
4775 | if (the_low_target.insert_point != NULL) |
4776 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4777 | else |
4778 | /* Unsupported (see target.h). */ | |
4779 | return 1; | |
4780 | } | |
4781 | ||
4782 | static int | |
d993e290 | 4783 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4784 | { |
d993e290 PA |
4785 | if (the_low_target.remove_point != NULL) |
4786 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4787 | else |
4788 | /* Unsupported (see target.h). */ | |
4789 | return 1; | |
4790 | } | |
4791 | ||
4792 | static int | |
4793 | linux_stopped_by_watchpoint (void) | |
4794 | { | |
c3adc08c PA |
4795 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4796 | ||
4797 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4798 | } |
4799 | ||
4800 | static CORE_ADDR | |
4801 | linux_stopped_data_address (void) | |
4802 | { | |
c3adc08c PA |
4803 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4804 | ||
4805 | return lwp->stopped_data_address; | |
e013ee27 OF |
4806 | } |
4807 | ||
42c81e2a | 4808 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
23512c01 MGD |
4809 | #if ! (defined(PT_TEXT_ADDR) \ |
4810 | || defined(PT_DATA_ADDR) \ | |
4811 | || defined(PT_TEXT_END_ADDR)) | |
52fb6437 NS |
4812 | #if defined(__mcoldfire__) |
4813 | /* These should really be defined in the kernel's ptrace.h header. */ | |
4814 | #define PT_TEXT_ADDR 49*4 | |
4815 | #define PT_DATA_ADDR 50*4 | |
4816 | #define PT_TEXT_END_ADDR 51*4 | |
eb826dc6 MF |
4817 | #elif defined(BFIN) |
4818 | #define PT_TEXT_ADDR 220 | |
4819 | #define PT_TEXT_END_ADDR 224 | |
4820 | #define PT_DATA_ADDR 228 | |
58dbd541 YQ |
4821 | #elif defined(__TMS320C6X__) |
4822 | #define PT_TEXT_ADDR (0x10000*4) | |
4823 | #define PT_DATA_ADDR (0x10004*4) | |
4824 | #define PT_TEXT_END_ADDR (0x10008*4) | |
52fb6437 | 4825 | #endif |
23512c01 | 4826 | #endif |
52fb6437 NS |
4827 | |
4828 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4829 | to tell gdb about. */ | |
4830 | ||
4831 | static int | |
4832 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4833 | { | |
4834 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
4835 | unsigned long text, text_end, data; | |
bd99dc85 | 4836 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4837 | |
4838 | errno = 0; | |
4839 | ||
4840 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
4841 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
4842 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
4843 | ||
4844 | if (errno == 0) | |
4845 | { | |
4846 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4847 | used by gdb) are relative to the beginning of the program, |
4848 | with the data segment immediately following the text segment. | |
4849 | However, the actual runtime layout in memory may put the data | |
4850 | somewhere else, so when we send gdb a data base-address, we | |
4851 | use the real data base address and subtract the compile-time | |
4852 | data base-address from it (which is just the length of the | |
4853 | text segment). BSS immediately follows data in both | |
4854 | cases. */ | |
52fb6437 NS |
4855 | *text_p = text; |
4856 | *data_p = data - (text_end - text); | |
1b3f6016 | 4857 | |
52fb6437 NS |
4858 | return 1; |
4859 | } | |
4860 | #endif | |
4861 | return 0; | |
4862 | } | |
4863 | #endif | |
4864 | ||
07e059b5 VP |
4865 | static int |
4866 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4867 | unsigned char *readbuf, unsigned const char *writebuf, |
4868 | CORE_ADDR offset, int len) | |
07e059b5 | 4869 | { |
d26e3629 | 4870 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4871 | } |
4872 | ||
d0722149 DE |
4873 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4874 | layout of the inferiors' architecture. */ | |
4875 | ||
4876 | static void | |
a5362b9a | 4877 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4878 | { |
4879 | int done = 0; | |
4880 | ||
4881 | if (the_low_target.siginfo_fixup != NULL) | |
4882 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4883 | ||
4884 | /* If there was no callback, or the callback didn't do anything, | |
4885 | then just do a straight memcpy. */ | |
4886 | if (!done) | |
4887 | { | |
4888 | if (direction == 1) | |
a5362b9a | 4889 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4890 | else |
a5362b9a | 4891 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
4892 | } |
4893 | } | |
4894 | ||
4aa995e1 PA |
4895 | static int |
4896 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4897 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4898 | { | |
d0722149 | 4899 | int pid; |
a5362b9a TS |
4900 | siginfo_t siginfo; |
4901 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
4902 | |
4903 | if (current_inferior == NULL) | |
4904 | return -1; | |
4905 | ||
bd99dc85 | 4906 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4907 | |
4908 | if (debug_threads) | |
d0722149 | 4909 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4910 | readbuf != NULL ? "Reading" : "Writing", |
4911 | pid); | |
4912 | ||
0adea5f7 | 4913 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4914 | return -1; |
4915 | ||
4916 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
4917 | return -1; | |
4918 | ||
d0722149 DE |
4919 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4920 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4921 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4922 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4923 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4924 | ||
4aa995e1 PA |
4925 | if (offset + len > sizeof (siginfo)) |
4926 | len = sizeof (siginfo) - offset; | |
4927 | ||
4928 | if (readbuf != NULL) | |
d0722149 | 4929 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4930 | else |
4931 | { | |
d0722149 DE |
4932 | memcpy (inf_siginfo + offset, writebuf, len); |
4933 | ||
4934 | /* Convert back to ptrace layout before flushing it out. */ | |
4935 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4936 | ||
4aa995e1 PA |
4937 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
4938 | return -1; | |
4939 | } | |
4940 | ||
4941 | return len; | |
4942 | } | |
4943 | ||
bd99dc85 PA |
4944 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4945 | so we notice when children change state; as the handler for the | |
4946 | sigsuspend in my_waitpid. */ | |
4947 | ||
4948 | static void | |
4949 | sigchld_handler (int signo) | |
4950 | { | |
4951 | int old_errno = errno; | |
4952 | ||
4953 | if (debug_threads) | |
e581f2b4 PA |
4954 | { |
4955 | do | |
4956 | { | |
4957 | /* fprintf is not async-signal-safe, so call write | |
4958 | directly. */ | |
4959 | if (write (2, "sigchld_handler\n", | |
4960 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4961 | break; /* just ignore */ | |
4962 | } while (0); | |
4963 | } | |
bd99dc85 PA |
4964 | |
4965 | if (target_is_async_p ()) | |
4966 | async_file_mark (); /* trigger a linux_wait */ | |
4967 | ||
4968 | errno = old_errno; | |
4969 | } | |
4970 | ||
4971 | static int | |
4972 | linux_supports_non_stop (void) | |
4973 | { | |
4974 | return 1; | |
4975 | } | |
4976 | ||
4977 | static int | |
4978 | linux_async (int enable) | |
4979 | { | |
4980 | int previous = (linux_event_pipe[0] != -1); | |
4981 | ||
8336d594 PA |
4982 | if (debug_threads) |
4983 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4984 | enable, previous); | |
4985 | ||
bd99dc85 PA |
4986 | if (previous != enable) |
4987 | { | |
4988 | sigset_t mask; | |
4989 | sigemptyset (&mask); | |
4990 | sigaddset (&mask, SIGCHLD); | |
4991 | ||
4992 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4993 | ||
4994 | if (enable) | |
4995 | { | |
4996 | if (pipe (linux_event_pipe) == -1) | |
4997 | fatal ("creating event pipe failed."); | |
4998 | ||
4999 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5000 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5001 | ||
5002 | /* Register the event loop handler. */ | |
5003 | add_file_handler (linux_event_pipe[0], | |
5004 | handle_target_event, NULL); | |
5005 | ||
5006 | /* Always trigger a linux_wait. */ | |
5007 | async_file_mark (); | |
5008 | } | |
5009 | else | |
5010 | { | |
5011 | delete_file_handler (linux_event_pipe[0]); | |
5012 | ||
5013 | close (linux_event_pipe[0]); | |
5014 | close (linux_event_pipe[1]); | |
5015 | linux_event_pipe[0] = -1; | |
5016 | linux_event_pipe[1] = -1; | |
5017 | } | |
5018 | ||
5019 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5020 | } | |
5021 | ||
5022 | return previous; | |
5023 | } | |
5024 | ||
5025 | static int | |
5026 | linux_start_non_stop (int nonstop) | |
5027 | { | |
5028 | /* Register or unregister from event-loop accordingly. */ | |
5029 | linux_async (nonstop); | |
5030 | return 0; | |
5031 | } | |
5032 | ||
cf8fd78b PA |
5033 | static int |
5034 | linux_supports_multi_process (void) | |
5035 | { | |
5036 | return 1; | |
5037 | } | |
5038 | ||
03583c20 UW |
5039 | static int |
5040 | linux_supports_disable_randomization (void) | |
5041 | { | |
5042 | #ifdef HAVE_PERSONALITY | |
5043 | return 1; | |
5044 | #else | |
5045 | return 0; | |
5046 | #endif | |
5047 | } | |
efcbbd14 | 5048 | |
d1feda86 YQ |
5049 | static int |
5050 | linux_supports_agent (void) | |
5051 | { | |
5052 | return 1; | |
5053 | } | |
5054 | ||
efcbbd14 UW |
5055 | /* Enumerate spufs IDs for process PID. */ |
5056 | static int | |
5057 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5058 | { | |
5059 | int pos = 0; | |
5060 | int written = 0; | |
5061 | char path[128]; | |
5062 | DIR *dir; | |
5063 | struct dirent *entry; | |
5064 | ||
5065 | sprintf (path, "/proc/%ld/fd", pid); | |
5066 | dir = opendir (path); | |
5067 | if (!dir) | |
5068 | return -1; | |
5069 | ||
5070 | rewinddir (dir); | |
5071 | while ((entry = readdir (dir)) != NULL) | |
5072 | { | |
5073 | struct stat st; | |
5074 | struct statfs stfs; | |
5075 | int fd; | |
5076 | ||
5077 | fd = atoi (entry->d_name); | |
5078 | if (!fd) | |
5079 | continue; | |
5080 | ||
5081 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5082 | if (stat (path, &st) != 0) | |
5083 | continue; | |
5084 | if (!S_ISDIR (st.st_mode)) | |
5085 | continue; | |
5086 | ||
5087 | if (statfs (path, &stfs) != 0) | |
5088 | continue; | |
5089 | if (stfs.f_type != SPUFS_MAGIC) | |
5090 | continue; | |
5091 | ||
5092 | if (pos >= offset && pos + 4 <= offset + len) | |
5093 | { | |
5094 | *(unsigned int *)(buf + pos - offset) = fd; | |
5095 | written += 4; | |
5096 | } | |
5097 | pos += 4; | |
5098 | } | |
5099 | ||
5100 | closedir (dir); | |
5101 | return written; | |
5102 | } | |
5103 | ||
5104 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5105 | object type, using the /proc file system. */ | |
5106 | static int | |
5107 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5108 | unsigned const char *writebuf, | |
5109 | CORE_ADDR offset, int len) | |
5110 | { | |
5111 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5112 | char buf[128]; | |
5113 | int fd = 0; | |
5114 | int ret = 0; | |
5115 | ||
5116 | if (!writebuf && !readbuf) | |
5117 | return -1; | |
5118 | ||
5119 | if (!*annex) | |
5120 | { | |
5121 | if (!readbuf) | |
5122 | return -1; | |
5123 | else | |
5124 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5125 | } | |
5126 | ||
5127 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5128 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5129 | if (fd <= 0) | |
5130 | return -1; | |
5131 | ||
5132 | if (offset != 0 | |
5133 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5134 | { | |
5135 | close (fd); | |
5136 | return 0; | |
5137 | } | |
5138 | ||
5139 | if (writebuf) | |
5140 | ret = write (fd, writebuf, (size_t) len); | |
5141 | else | |
5142 | ret = read (fd, readbuf, (size_t) len); | |
5143 | ||
5144 | close (fd); | |
5145 | return ret; | |
5146 | } | |
5147 | ||
723b724b | 5148 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5149 | struct target_loadseg |
5150 | { | |
5151 | /* Core address to which the segment is mapped. */ | |
5152 | Elf32_Addr addr; | |
5153 | /* VMA recorded in the program header. */ | |
5154 | Elf32_Addr p_vaddr; | |
5155 | /* Size of this segment in memory. */ | |
5156 | Elf32_Word p_memsz; | |
5157 | }; | |
5158 | ||
723b724b | 5159 | # if defined PT_GETDSBT |
78d85199 YQ |
5160 | struct target_loadmap |
5161 | { | |
5162 | /* Protocol version number, must be zero. */ | |
5163 | Elf32_Word version; | |
5164 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5165 | unsigned *dsbt_table; | |
5166 | unsigned dsbt_size, dsbt_index; | |
5167 | /* Number of segments in this map. */ | |
5168 | Elf32_Word nsegs; | |
5169 | /* The actual memory map. */ | |
5170 | struct target_loadseg segs[/*nsegs*/]; | |
5171 | }; | |
723b724b MF |
5172 | # define LINUX_LOADMAP PT_GETDSBT |
5173 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5174 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5175 | # else | |
5176 | struct target_loadmap | |
5177 | { | |
5178 | /* Protocol version number, must be zero. */ | |
5179 | Elf32_Half version; | |
5180 | /* Number of segments in this map. */ | |
5181 | Elf32_Half nsegs; | |
5182 | /* The actual memory map. */ | |
5183 | struct target_loadseg segs[/*nsegs*/]; | |
5184 | }; | |
5185 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5186 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5187 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5188 | # endif | |
78d85199 | 5189 | |
78d85199 YQ |
5190 | static int |
5191 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5192 | unsigned char *myaddr, unsigned int len) | |
5193 | { | |
5194 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5195 | int addr = -1; | |
5196 | struct target_loadmap *data = NULL; | |
5197 | unsigned int actual_length, copy_length; | |
5198 | ||
5199 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5200 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5201 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5202 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5203 | else |
5204 | return -1; | |
5205 | ||
723b724b | 5206 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5207 | return -1; |
5208 | ||
5209 | if (data == NULL) | |
5210 | return -1; | |
5211 | ||
5212 | actual_length = sizeof (struct target_loadmap) | |
5213 | + sizeof (struct target_loadseg) * data->nsegs; | |
5214 | ||
5215 | if (offset < 0 || offset > actual_length) | |
5216 | return -1; | |
5217 | ||
5218 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5219 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5220 | return copy_length; | |
5221 | } | |
723b724b MF |
5222 | #else |
5223 | # define linux_read_loadmap NULL | |
5224 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5225 | |
1570b33e L |
5226 | static void |
5227 | linux_process_qsupported (const char *query) | |
5228 | { | |
5229 | if (the_low_target.process_qsupported != NULL) | |
5230 | the_low_target.process_qsupported (query); | |
5231 | } | |
5232 | ||
219f2f23 PA |
5233 | static int |
5234 | linux_supports_tracepoints (void) | |
5235 | { | |
5236 | if (*the_low_target.supports_tracepoints == NULL) | |
5237 | return 0; | |
5238 | ||
5239 | return (*the_low_target.supports_tracepoints) (); | |
5240 | } | |
5241 | ||
5242 | static CORE_ADDR | |
5243 | linux_read_pc (struct regcache *regcache) | |
5244 | { | |
5245 | if (the_low_target.get_pc == NULL) | |
5246 | return 0; | |
5247 | ||
5248 | return (*the_low_target.get_pc) (regcache); | |
5249 | } | |
5250 | ||
5251 | static void | |
5252 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5253 | { | |
5254 | gdb_assert (the_low_target.set_pc != NULL); | |
5255 | ||
5256 | (*the_low_target.set_pc) (regcache, pc); | |
5257 | } | |
5258 | ||
8336d594 PA |
5259 | static int |
5260 | linux_thread_stopped (struct thread_info *thread) | |
5261 | { | |
5262 | return get_thread_lwp (thread)->stopped; | |
5263 | } | |
5264 | ||
5265 | /* This exposes stop-all-threads functionality to other modules. */ | |
5266 | ||
5267 | static void | |
7984d532 | 5268 | linux_pause_all (int freeze) |
8336d594 | 5269 | { |
7984d532 PA |
5270 | stop_all_lwps (freeze, NULL); |
5271 | } | |
5272 | ||
5273 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5274 | modules. */ | |
5275 | ||
5276 | static void | |
5277 | linux_unpause_all (int unfreeze) | |
5278 | { | |
5279 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5280 | } |
5281 | ||
90d74c30 PA |
5282 | static int |
5283 | linux_prepare_to_access_memory (void) | |
5284 | { | |
5285 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5286 | running LWP. */ | |
5287 | if (non_stop) | |
5288 | linux_pause_all (1); | |
5289 | return 0; | |
5290 | } | |
5291 | ||
5292 | static void | |
0146f85b | 5293 | linux_done_accessing_memory (void) |
90d74c30 PA |
5294 | { |
5295 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5296 | running LWP. */ | |
5297 | if (non_stop) | |
5298 | linux_unpause_all (1); | |
5299 | } | |
5300 | ||
fa593d66 PA |
5301 | static int |
5302 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5303 | CORE_ADDR collector, | |
5304 | CORE_ADDR lockaddr, | |
5305 | ULONGEST orig_size, | |
5306 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5307 | CORE_ADDR *trampoline, |
5308 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5309 | unsigned char *jjump_pad_insn, |
5310 | ULONGEST *jjump_pad_insn_size, | |
5311 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5312 | CORE_ADDR *adjusted_insn_addr_end, |
5313 | char *err) | |
fa593d66 PA |
5314 | { |
5315 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5316 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5317 | jump_entry, trampoline, trampoline_size, |
5318 | jjump_pad_insn, jjump_pad_insn_size, | |
5319 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5320 | err); | |
fa593d66 PA |
5321 | } |
5322 | ||
6a271cae PA |
5323 | static struct emit_ops * |
5324 | linux_emit_ops (void) | |
5325 | { | |
5326 | if (the_low_target.emit_ops != NULL) | |
5327 | return (*the_low_target.emit_ops) (); | |
5328 | else | |
5329 | return NULL; | |
5330 | } | |
5331 | ||
405f8e94 SS |
5332 | static int |
5333 | linux_get_min_fast_tracepoint_insn_len (void) | |
5334 | { | |
5335 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5336 | } | |
5337 | ||
2268b414 JK |
5338 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5339 | ||
5340 | static int | |
5341 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5342 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5343 | { | |
5344 | char filename[PATH_MAX]; | |
5345 | int fd; | |
5346 | const int auxv_size = is_elf64 | |
5347 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5348 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5349 | ||
5350 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5351 | ||
5352 | fd = open (filename, O_RDONLY); | |
5353 | if (fd < 0) | |
5354 | return 1; | |
5355 | ||
5356 | *phdr_memaddr = 0; | |
5357 | *num_phdr = 0; | |
5358 | while (read (fd, buf, auxv_size) == auxv_size | |
5359 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5360 | { | |
5361 | if (is_elf64) | |
5362 | { | |
5363 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5364 | ||
5365 | switch (aux->a_type) | |
5366 | { | |
5367 | case AT_PHDR: | |
5368 | *phdr_memaddr = aux->a_un.a_val; | |
5369 | break; | |
5370 | case AT_PHNUM: | |
5371 | *num_phdr = aux->a_un.a_val; | |
5372 | break; | |
5373 | } | |
5374 | } | |
5375 | else | |
5376 | { | |
5377 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5378 | ||
5379 | switch (aux->a_type) | |
5380 | { | |
5381 | case AT_PHDR: | |
5382 | *phdr_memaddr = aux->a_un.a_val; | |
5383 | break; | |
5384 | case AT_PHNUM: | |
5385 | *num_phdr = aux->a_un.a_val; | |
5386 | break; | |
5387 | } | |
5388 | } | |
5389 | } | |
5390 | ||
5391 | close (fd); | |
5392 | ||
5393 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5394 | { | |
5395 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5396 | "phdr_memaddr = %ld, phdr_num = %d", | |
5397 | (long) *phdr_memaddr, *num_phdr); | |
5398 | return 2; | |
5399 | } | |
5400 | ||
5401 | return 0; | |
5402 | } | |
5403 | ||
5404 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5405 | ||
5406 | static CORE_ADDR | |
5407 | get_dynamic (const int pid, const int is_elf64) | |
5408 | { | |
5409 | CORE_ADDR phdr_memaddr, relocation; | |
5410 | int num_phdr, i; | |
5411 | unsigned char *phdr_buf; | |
5412 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5413 | ||
5414 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5415 | return 0; | |
5416 | ||
5417 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5418 | phdr_buf = alloca (num_phdr * phdr_size); | |
5419 | ||
5420 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5421 | return 0; | |
5422 | ||
5423 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5424 | non-zero for PIE ones. */ | |
5425 | relocation = -1; | |
5426 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5427 | if (is_elf64) | |
5428 | { | |
5429 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5430 | ||
5431 | if (p->p_type == PT_PHDR) | |
5432 | relocation = phdr_memaddr - p->p_vaddr; | |
5433 | } | |
5434 | else | |
5435 | { | |
5436 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5437 | ||
5438 | if (p->p_type == PT_PHDR) | |
5439 | relocation = phdr_memaddr - p->p_vaddr; | |
5440 | } | |
5441 | ||
5442 | if (relocation == -1) | |
5443 | { | |
e237a7e2 JK |
5444 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5445 | any real world executables, including PIE executables, have always | |
5446 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5447 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5448 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5449 | ||
5450 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5451 | ||
5452 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5453 | ||
2268b414 JK |
5454 | return 0; |
5455 | } | |
5456 | ||
5457 | for (i = 0; i < num_phdr; i++) | |
5458 | { | |
5459 | if (is_elf64) | |
5460 | { | |
5461 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5462 | ||
5463 | if (p->p_type == PT_DYNAMIC) | |
5464 | return p->p_vaddr + relocation; | |
5465 | } | |
5466 | else | |
5467 | { | |
5468 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5469 | ||
5470 | if (p->p_type == PT_DYNAMIC) | |
5471 | return p->p_vaddr + relocation; | |
5472 | } | |
5473 | } | |
5474 | ||
5475 | return 0; | |
5476 | } | |
5477 | ||
5478 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5479 | can be 0 if the inferior does not yet have the library list initialized. |
5480 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5481 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5482 | |
5483 | static CORE_ADDR | |
5484 | get_r_debug (const int pid, const int is_elf64) | |
5485 | { | |
5486 | CORE_ADDR dynamic_memaddr; | |
5487 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5488 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5489 | CORE_ADDR map = -1; |
2268b414 JK |
5490 | |
5491 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5492 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5493 | return map; |
2268b414 JK |
5494 | |
5495 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5496 | { | |
5497 | if (is_elf64) | |
5498 | { | |
5499 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5500 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5501 | union |
5502 | { | |
5503 | Elf64_Xword map; | |
5504 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5505 | } | |
5506 | rld_map; | |
5507 | ||
5508 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5509 | { | |
5510 | if (linux_read_memory (dyn->d_un.d_val, | |
5511 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5512 | return rld_map.map; | |
5513 | else | |
5514 | break; | |
5515 | } | |
75f62ce7 | 5516 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5517 | |
367ba2c2 MR |
5518 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5519 | map = dyn->d_un.d_val; | |
2268b414 JK |
5520 | |
5521 | if (dyn->d_tag == DT_NULL) | |
5522 | break; | |
5523 | } | |
5524 | else | |
5525 | { | |
5526 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5527 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5528 | union |
5529 | { | |
5530 | Elf32_Word map; | |
5531 | unsigned char buf[sizeof (Elf32_Word)]; | |
5532 | } | |
5533 | rld_map; | |
5534 | ||
5535 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5536 | { | |
5537 | if (linux_read_memory (dyn->d_un.d_val, | |
5538 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5539 | return rld_map.map; | |
5540 | else | |
5541 | break; | |
5542 | } | |
75f62ce7 | 5543 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5544 | |
367ba2c2 MR |
5545 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5546 | map = dyn->d_un.d_val; | |
2268b414 JK |
5547 | |
5548 | if (dyn->d_tag == DT_NULL) | |
5549 | break; | |
5550 | } | |
5551 | ||
5552 | dynamic_memaddr += dyn_size; | |
5553 | } | |
5554 | ||
367ba2c2 | 5555 | return map; |
2268b414 JK |
5556 | } |
5557 | ||
5558 | /* Read one pointer from MEMADDR in the inferior. */ | |
5559 | ||
5560 | static int | |
5561 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5562 | { | |
485f1ee4 PA |
5563 | int ret; |
5564 | ||
5565 | /* Go through a union so this works on either big or little endian | |
5566 | hosts, when the inferior's pointer size is smaller than the size | |
5567 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5568 | same of the superior's. */ | |
5569 | union | |
5570 | { | |
5571 | CORE_ADDR core_addr; | |
5572 | unsigned int ui; | |
5573 | unsigned char uc; | |
5574 | } addr; | |
5575 | ||
5576 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5577 | if (ret == 0) | |
5578 | { | |
5579 | if (ptr_size == sizeof (CORE_ADDR)) | |
5580 | *ptr = addr.core_addr; | |
5581 | else if (ptr_size == sizeof (unsigned int)) | |
5582 | *ptr = addr.ui; | |
5583 | else | |
5584 | gdb_assert_not_reached ("unhandled pointer size"); | |
5585 | } | |
5586 | return ret; | |
2268b414 JK |
5587 | } |
5588 | ||
5589 | struct link_map_offsets | |
5590 | { | |
5591 | /* Offset and size of r_debug.r_version. */ | |
5592 | int r_version_offset; | |
5593 | ||
5594 | /* Offset and size of r_debug.r_map. */ | |
5595 | int r_map_offset; | |
5596 | ||
5597 | /* Offset to l_addr field in struct link_map. */ | |
5598 | int l_addr_offset; | |
5599 | ||
5600 | /* Offset to l_name field in struct link_map. */ | |
5601 | int l_name_offset; | |
5602 | ||
5603 | /* Offset to l_ld field in struct link_map. */ | |
5604 | int l_ld_offset; | |
5605 | ||
5606 | /* Offset to l_next field in struct link_map. */ | |
5607 | int l_next_offset; | |
5608 | ||
5609 | /* Offset to l_prev field in struct link_map. */ | |
5610 | int l_prev_offset; | |
5611 | }; | |
5612 | ||
fb723180 | 5613 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5614 | |
5615 | static int | |
5616 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5617 | unsigned const char *writebuf, | |
5618 | CORE_ADDR offset, int len) | |
5619 | { | |
5620 | char *document; | |
5621 | unsigned document_len; | |
5622 | struct process_info_private *const priv = current_process ()->private; | |
5623 | char filename[PATH_MAX]; | |
5624 | int pid, is_elf64; | |
5625 | ||
5626 | static const struct link_map_offsets lmo_32bit_offsets = | |
5627 | { | |
5628 | 0, /* r_version offset. */ | |
5629 | 4, /* r_debug.r_map offset. */ | |
5630 | 0, /* l_addr offset in link_map. */ | |
5631 | 4, /* l_name offset in link_map. */ | |
5632 | 8, /* l_ld offset in link_map. */ | |
5633 | 12, /* l_next offset in link_map. */ | |
5634 | 16 /* l_prev offset in link_map. */ | |
5635 | }; | |
5636 | ||
5637 | static const struct link_map_offsets lmo_64bit_offsets = | |
5638 | { | |
5639 | 0, /* r_version offset. */ | |
5640 | 8, /* r_debug.r_map offset. */ | |
5641 | 0, /* l_addr offset in link_map. */ | |
5642 | 8, /* l_name offset in link_map. */ | |
5643 | 16, /* l_ld offset in link_map. */ | |
5644 | 24, /* l_next offset in link_map. */ | |
5645 | 32 /* l_prev offset in link_map. */ | |
5646 | }; | |
5647 | const struct link_map_offsets *lmo; | |
214d508e | 5648 | unsigned int machine; |
2268b414 JK |
5649 | |
5650 | if (writebuf != NULL) | |
5651 | return -2; | |
5652 | if (readbuf == NULL) | |
5653 | return -1; | |
5654 | ||
5655 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5656 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
214d508e | 5657 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 JK |
5658 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
5659 | ||
5660 | if (priv->r_debug == 0) | |
5661 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5662 | ||
0c5bf5a9 JK |
5663 | /* We failed to find DT_DEBUG. Such situation will not change for this |
5664 | inferior - do not retry it. Report it to GDB as E01, see for the reasons | |
5665 | at the GDB solib-svr4.c side. */ | |
5666 | if (priv->r_debug == (CORE_ADDR) -1) | |
5667 | return -1; | |
5668 | ||
5669 | if (priv->r_debug == 0) | |
2268b414 JK |
5670 | { |
5671 | document = xstrdup ("<library-list-svr4 version=\"1.0\"/>\n"); | |
5672 | } | |
5673 | else | |
5674 | { | |
5675 | int allocated = 1024; | |
5676 | char *p; | |
5677 | const int ptr_size = is_elf64 ? 8 : 4; | |
5678 | CORE_ADDR lm_addr, lm_prev, l_name, l_addr, l_ld, l_next, l_prev; | |
5679 | int r_version, header_done = 0; | |
5680 | ||
5681 | document = xmalloc (allocated); | |
5682 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5683 | p = document + strlen (document); | |
5684 | ||
5685 | r_version = 0; | |
5686 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, | |
5687 | (unsigned char *) &r_version, | |
5688 | sizeof (r_version)) != 0 | |
5689 | || r_version != 1) | |
5690 | { | |
5691 | warning ("unexpected r_debug version %d", r_version); | |
5692 | goto done; | |
5693 | } | |
5694 | ||
5695 | if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5696 | &lm_addr, ptr_size) != 0) | |
5697 | { | |
5698 | warning ("unable to read r_map from 0x%lx", | |
5699 | (long) priv->r_debug + lmo->r_map_offset); | |
5700 | goto done; | |
5701 | } | |
5702 | ||
5703 | lm_prev = 0; | |
5704 | while (read_one_ptr (lm_addr + lmo->l_name_offset, | |
5705 | &l_name, ptr_size) == 0 | |
5706 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5707 | &l_addr, ptr_size) == 0 | |
5708 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5709 | &l_ld, ptr_size) == 0 | |
5710 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5711 | &l_prev, ptr_size) == 0 | |
5712 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5713 | &l_next, ptr_size) == 0) | |
5714 | { | |
5715 | unsigned char libname[PATH_MAX]; | |
5716 | ||
5717 | if (lm_prev != l_prev) | |
5718 | { | |
5719 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", | |
5720 | (long) lm_prev, (long) l_prev); | |
5721 | break; | |
5722 | } | |
5723 | ||
5724 | /* Not checking for error because reading may stop before | |
5725 | we've got PATH_MAX worth of characters. */ | |
5726 | libname[0] = '\0'; | |
5727 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5728 | libname[sizeof (libname) - 1] = '\0'; | |
5729 | if (libname[0] != '\0') | |
5730 | { | |
5731 | /* 6x the size for xml_escape_text below. */ | |
5732 | size_t len = 6 * strlen ((char *) libname); | |
5733 | char *name; | |
5734 | ||
5735 | if (!header_done) | |
5736 | { | |
5737 | /* Terminate `<library-list-svr4'. */ | |
5738 | *p++ = '>'; | |
5739 | header_done = 1; | |
5740 | } | |
5741 | ||
5742 | while (allocated < p - document + len + 200) | |
5743 | { | |
5744 | /* Expand to guarantee sufficient storage. */ | |
5745 | uintptr_t document_len = p - document; | |
5746 | ||
5747 | document = xrealloc (document, 2 * allocated); | |
5748 | allocated *= 2; | |
5749 | p = document + document_len; | |
5750 | } | |
5751 | ||
5752 | name = xml_escape_text ((char *) libname); | |
5753 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5754 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5755 | name, (unsigned long) lm_addr, | |
5756 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5757 | free (name); | |
5758 | } | |
5759 | else if (lm_prev == 0) | |
5760 | { | |
5761 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); | |
5762 | p = p + strlen (p); | |
5763 | } | |
5764 | ||
5765 | if (l_next == 0) | |
5766 | break; | |
5767 | ||
5768 | lm_prev = lm_addr; | |
5769 | lm_addr = l_next; | |
5770 | } | |
5771 | done: | |
0afae3cf PA |
5772 | if (!header_done) |
5773 | { | |
5774 | /* Empty list; terminate `<library-list-svr4'. */ | |
5775 | strcpy (p, "/>"); | |
5776 | } | |
5777 | else | |
5778 | strcpy (p, "</library-list-svr4>"); | |
2268b414 JK |
5779 | } |
5780 | ||
5781 | document_len = strlen (document); | |
5782 | if (offset < document_len) | |
5783 | document_len -= offset; | |
5784 | else | |
5785 | document_len = 0; | |
5786 | if (len > document_len) | |
5787 | len = document_len; | |
5788 | ||
5789 | memcpy (readbuf, document + offset, len); | |
5790 | xfree (document); | |
5791 | ||
5792 | return len; | |
5793 | } | |
5794 | ||
ce3a066d DJ |
5795 | static struct target_ops linux_target_ops = { |
5796 | linux_create_inferior, | |
5797 | linux_attach, | |
5798 | linux_kill, | |
6ad8ae5c | 5799 | linux_detach, |
8336d594 | 5800 | linux_mourn, |
444d6139 | 5801 | linux_join, |
ce3a066d DJ |
5802 | linux_thread_alive, |
5803 | linux_resume, | |
5804 | linux_wait, | |
5805 | linux_fetch_registers, | |
5806 | linux_store_registers, | |
90d74c30 | 5807 | linux_prepare_to_access_memory, |
0146f85b | 5808 | linux_done_accessing_memory, |
ce3a066d DJ |
5809 | linux_read_memory, |
5810 | linux_write_memory, | |
2f2893d9 | 5811 | linux_look_up_symbols, |
ef57601b | 5812 | linux_request_interrupt, |
aa691b87 | 5813 | linux_read_auxv, |
d993e290 PA |
5814 | linux_insert_point, |
5815 | linux_remove_point, | |
e013ee27 OF |
5816 | linux_stopped_by_watchpoint, |
5817 | linux_stopped_data_address, | |
42c81e2a | 5818 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 5819 | linux_read_offsets, |
dae5f5cf DJ |
5820 | #else |
5821 | NULL, | |
5822 | #endif | |
5823 | #ifdef USE_THREAD_DB | |
5824 | thread_db_get_tls_address, | |
5825 | #else | |
5826 | NULL, | |
52fb6437 | 5827 | #endif |
efcbbd14 | 5828 | linux_qxfer_spu, |
59a016f0 | 5829 | hostio_last_error_from_errno, |
07e059b5 | 5830 | linux_qxfer_osdata, |
4aa995e1 | 5831 | linux_xfer_siginfo, |
bd99dc85 PA |
5832 | linux_supports_non_stop, |
5833 | linux_async, | |
5834 | linux_start_non_stop, | |
cdbfd419 PP |
5835 | linux_supports_multi_process, |
5836 | #ifdef USE_THREAD_DB | |
dc146f7c | 5837 | thread_db_handle_monitor_command, |
cdbfd419 | 5838 | #else |
dc146f7c | 5839 | NULL, |
cdbfd419 | 5840 | #endif |
d26e3629 | 5841 | linux_common_core_of_thread, |
78d85199 | 5842 | linux_read_loadmap, |
219f2f23 PA |
5843 | linux_process_qsupported, |
5844 | linux_supports_tracepoints, | |
5845 | linux_read_pc, | |
8336d594 PA |
5846 | linux_write_pc, |
5847 | linux_thread_stopped, | |
7984d532 | 5848 | NULL, |
711e434b | 5849 | linux_pause_all, |
7984d532 | 5850 | linux_unpause_all, |
fa593d66 PA |
5851 | linux_cancel_breakpoints, |
5852 | linux_stabilize_threads, | |
6a271cae | 5853 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
5854 | linux_emit_ops, |
5855 | linux_supports_disable_randomization, | |
405f8e94 | 5856 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 5857 | linux_qxfer_libraries_svr4, |
d1feda86 | 5858 | linux_supports_agent, |
ce3a066d DJ |
5859 | }; |
5860 | ||
0d62e5e8 DJ |
5861 | static void |
5862 | linux_init_signals () | |
5863 | { | |
5864 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5865 | to find what the cancel signal actually is. */ | |
1a981360 | 5866 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5867 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5868 | #endif |
0d62e5e8 DJ |
5869 | } |
5870 | ||
da6d8c04 DJ |
5871 | void |
5872 | initialize_low (void) | |
5873 | { | |
bd99dc85 PA |
5874 | struct sigaction sigchld_action; |
5875 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5876 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5877 | set_breakpoint_data (the_low_target.breakpoint, |
5878 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5879 | linux_init_signals (); |
24a09b5f | 5880 | linux_test_for_tracefork (); |
52fa2412 UW |
5881 | #ifdef HAVE_LINUX_REGSETS |
5882 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
5883 | ; | |
bca929d3 | 5884 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 5885 | #endif |
bd99dc85 PA |
5886 | |
5887 | sigchld_action.sa_handler = sigchld_handler; | |
5888 | sigemptyset (&sigchld_action.sa_mask); | |
5889 | sigchld_action.sa_flags = SA_RESTART; | |
5890 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 5891 | } |