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