Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
545587ee | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
7b6bb8da | 3 | 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
da6d8c04 DJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
19 | |
20 | #include "server.h" | |
58caa3dc | 21 | #include "linux-low.h" |
da6d8c04 | 22 | |
58caa3dc | 23 | #include <sys/wait.h> |
da6d8c04 DJ |
24 | #include <stdio.h> |
25 | #include <sys/param.h> | |
da6d8c04 | 26 | #include <sys/ptrace.h> |
da6d8c04 DJ |
27 | #include <signal.h> |
28 | #include <sys/ioctl.h> | |
29 | #include <fcntl.h> | |
d07c63e7 | 30 | #include <string.h> |
0a30fbc4 DJ |
31 | #include <stdlib.h> |
32 | #include <unistd.h> | |
fa6a77dc | 33 | #include <errno.h> |
fd500816 | 34 | #include <sys/syscall.h> |
f9387fc3 | 35 | #include <sched.h> |
07e059b5 VP |
36 | #include <ctype.h> |
37 | #include <pwd.h> | |
38 | #include <sys/types.h> | |
39 | #include <dirent.h> | |
efcbbd14 UW |
40 | #include <sys/stat.h> |
41 | #include <sys/vfs.h> | |
1570b33e | 42 | #include <sys/uio.h> |
957f3f49 DE |
43 | #ifndef ELFMAG0 |
44 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
45 | then ELFMAG0 will have been defined. If it didn't get included by | |
46 | gdb_proc_service.h then including it will likely introduce a duplicate | |
47 | definition of elf_fpregset_t. */ | |
48 | #include <elf.h> | |
49 | #endif | |
efcbbd14 UW |
50 | |
51 | #ifndef SPUFS_MAGIC | |
52 | #define SPUFS_MAGIC 0x23c9b64e | |
53 | #endif | |
da6d8c04 | 54 | |
32ca6d61 DJ |
55 | #ifndef PTRACE_GETSIGINFO |
56 | # define PTRACE_GETSIGINFO 0x4202 | |
57 | # define PTRACE_SETSIGINFO 0x4203 | |
58 | #endif | |
59 | ||
fd462a61 DJ |
60 | #ifndef O_LARGEFILE |
61 | #define O_LARGEFILE 0 | |
62 | #endif | |
63 | ||
24a09b5f DJ |
64 | /* If the system headers did not provide the constants, hard-code the normal |
65 | values. */ | |
66 | #ifndef PTRACE_EVENT_FORK | |
67 | ||
68 | #define PTRACE_SETOPTIONS 0x4200 | |
69 | #define PTRACE_GETEVENTMSG 0x4201 | |
70 | ||
71 | /* options set using PTRACE_SETOPTIONS */ | |
72 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
73 | #define PTRACE_O_TRACEFORK 0x00000002 | |
74 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
75 | #define PTRACE_O_TRACECLONE 0x00000008 | |
76 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
77 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 | |
78 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
79 | ||
80 | /* Wait extended result codes for the above trace options. */ | |
81 | #define PTRACE_EVENT_FORK 1 | |
82 | #define PTRACE_EVENT_VFORK 2 | |
83 | #define PTRACE_EVENT_CLONE 3 | |
84 | #define PTRACE_EVENT_EXEC 4 | |
85 | #define PTRACE_EVENT_VFORK_DONE 5 | |
86 | #define PTRACE_EVENT_EXIT 6 | |
87 | ||
88 | #endif /* PTRACE_EVENT_FORK */ | |
89 | ||
90 | /* We can't always assume that this flag is available, but all systems | |
91 | with the ptrace event handlers also have __WALL, so it's safe to use | |
92 | in some contexts. */ | |
93 | #ifndef __WALL | |
94 | #define __WALL 0x40000000 /* Wait for any child. */ | |
95 | #endif | |
96 | ||
ec8ebe72 DE |
97 | #ifndef W_STOPCODE |
98 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
99 | #endif | |
100 | ||
1a981360 PA |
101 | /* This is the kernel's hard limit. Not to be confused with |
102 | SIGRTMIN. */ | |
103 | #ifndef __SIGRTMIN | |
104 | #define __SIGRTMIN 32 | |
105 | #endif | |
106 | ||
42c81e2a DJ |
107 | #ifdef __UCLIBC__ |
108 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
109 | #define HAS_NOMMU | |
110 | #endif | |
111 | #endif | |
112 | ||
24a09b5f DJ |
113 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
114 | representation of the thread ID. | |
611cb4a5 | 115 | |
54a0b537 | 116 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
117 | the same as the LWP ID. |
118 | ||
119 | ``all_processes'' is keyed by the "overall process ID", which | |
120 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 121 | |
54a0b537 | 122 | struct inferior_list all_lwps; |
0d62e5e8 | 123 | |
24a09b5f DJ |
124 | /* A list of all unknown processes which receive stop signals. Some other |
125 | process will presumably claim each of these as forked children | |
126 | momentarily. */ | |
127 | ||
128 | struct inferior_list stopped_pids; | |
129 | ||
0d62e5e8 DJ |
130 | /* FIXME this is a bit of a hack, and could be removed. */ |
131 | int stopping_threads; | |
132 | ||
133 | /* FIXME make into a target method? */ | |
24a09b5f | 134 | int using_threads = 1; |
24a09b5f | 135 | |
fa593d66 PA |
136 | /* True if we're presently stabilizing threads (moving them out of |
137 | jump pads). */ | |
138 | static int stabilizing_threads; | |
139 | ||
95954743 PA |
140 | /* This flag is true iff we've just created or attached to our first |
141 | inferior but it has not stopped yet. As soon as it does, we need | |
142 | to call the low target's arch_setup callback. Doing this only on | |
143 | the first inferior avoids reinializing the architecture on every | |
144 | inferior, and avoids messing with the register caches of the | |
145 | already running inferiors. NOTE: this assumes all inferiors under | |
146 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
147 | static int new_inferior; |
148 | ||
2acc282a | 149 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 150 | int step, int signal, siginfo_t *info); |
2bd7c093 | 151 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
152 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
153 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 154 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 155 | static void *add_lwp (ptid_t ptid); |
c35fafde | 156 | static int linux_stopped_by_watchpoint (void); |
95954743 | 157 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
dc146f7c | 158 | static int linux_core_of_thread (ptid_t ptid); |
d50171e4 | 159 | static void proceed_all_lwps (void); |
d50171e4 PA |
160 | static int finish_step_over (struct lwp_info *lwp); |
161 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
162 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 163 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
164 | |
165 | /* True if the low target can hardware single-step. Such targets | |
166 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
167 | ||
168 | static int | |
169 | can_hardware_single_step (void) | |
170 | { | |
171 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
172 | } | |
173 | ||
174 | /* True if the low target supports memory breakpoints. If so, we'll | |
175 | have a GET_PC implementation. */ | |
176 | ||
177 | static int | |
178 | supports_breakpoints (void) | |
179 | { | |
180 | return (the_low_target.get_pc != NULL); | |
181 | } | |
0d62e5e8 | 182 | |
fa593d66 PA |
183 | /* Returns true if this target can support fast tracepoints. This |
184 | does not mean that the in-process agent has been loaded in the | |
185 | inferior. */ | |
186 | ||
187 | static int | |
188 | supports_fast_tracepoints (void) | |
189 | { | |
190 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
191 | } | |
192 | ||
0d62e5e8 DJ |
193 | struct pending_signals |
194 | { | |
195 | int signal; | |
32ca6d61 | 196 | siginfo_t info; |
0d62e5e8 DJ |
197 | struct pending_signals *prev; |
198 | }; | |
611cb4a5 | 199 | |
14ce3065 DE |
200 | #define PTRACE_ARG3_TYPE void * |
201 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 202 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 203 | |
58caa3dc | 204 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
205 | static char *disabled_regsets; |
206 | static int num_regsets; | |
58caa3dc DJ |
207 | #endif |
208 | ||
bd99dc85 PA |
209 | /* The read/write ends of the pipe registered as waitable file in the |
210 | event loop. */ | |
211 | static int linux_event_pipe[2] = { -1, -1 }; | |
212 | ||
213 | /* True if we're currently in async mode. */ | |
214 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
215 | ||
02fc4de7 | 216 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
217 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
218 | ||
d0722149 DE |
219 | /* Accepts an integer PID; Returns a string representing a file that |
220 | can be opened to get info for the child process. | |
221 | Space for the result is malloc'd, caller must free. */ | |
222 | ||
223 | char * | |
224 | linux_child_pid_to_exec_file (int pid) | |
225 | { | |
226 | char *name1, *name2; | |
227 | ||
228 | name1 = xmalloc (MAXPATHLEN); | |
229 | name2 = xmalloc (MAXPATHLEN); | |
230 | memset (name2, 0, MAXPATHLEN); | |
231 | ||
232 | sprintf (name1, "/proc/%d/exe", pid); | |
233 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
234 | { | |
235 | free (name1); | |
236 | return name2; | |
237 | } | |
238 | else | |
239 | { | |
240 | free (name2); | |
241 | return name1; | |
242 | } | |
243 | } | |
244 | ||
245 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
246 | ||
247 | static int | |
957f3f49 | 248 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
249 | { |
250 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
251 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
252 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
253 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
254 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
255 | } | |
256 | ||
257 | /* Return non-zero if FILE is a 64-bit ELF file, | |
258 | zero if the file is not a 64-bit ELF file, | |
259 | and -1 if the file is not accessible or doesn't exist. */ | |
260 | ||
261 | int | |
262 | elf_64_file_p (const char *file) | |
263 | { | |
957f3f49 | 264 | Elf64_Ehdr header; |
d0722149 DE |
265 | int fd; |
266 | ||
267 | fd = open (file, O_RDONLY); | |
268 | if (fd < 0) | |
269 | return -1; | |
270 | ||
271 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
272 | { | |
273 | close (fd); | |
274 | return 0; | |
275 | } | |
276 | close (fd); | |
277 | ||
278 | return elf_64_header_p (&header); | |
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; |
836acd6d | 400 | int ret, status = W_STOPCODE (SIGSTOP); |
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. */ | |
405 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
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 | { |
a6dbe5df | 559 | struct lwp_info *new_lwp; |
da6d8c04 | 560 | int pid; |
95954743 | 561 | ptid_t ptid; |
da6d8c04 | 562 | |
42c81e2a | 563 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
564 | pid = vfork (); |
565 | #else | |
da6d8c04 | 566 | pid = fork (); |
52fb6437 | 567 | #endif |
da6d8c04 DJ |
568 | if (pid < 0) |
569 | perror_with_name ("fork"); | |
570 | ||
571 | if (pid == 0) | |
572 | { | |
573 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
574 | ||
1a981360 | 575 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 576 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 577 | #endif |
0d62e5e8 | 578 | |
a9fa9f7d DJ |
579 | setpgid (0, 0); |
580 | ||
2b876972 DJ |
581 | execv (program, allargs); |
582 | if (errno == ENOENT) | |
583 | execvp (program, allargs); | |
da6d8c04 DJ |
584 | |
585 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 586 | strerror (errno)); |
da6d8c04 DJ |
587 | fflush (stderr); |
588 | _exit (0177); | |
589 | } | |
590 | ||
95954743 PA |
591 | linux_add_process (pid, 0); |
592 | ||
593 | ptid = ptid_build (pid, pid, 0); | |
594 | new_lwp = add_lwp (ptid); | |
595 | add_thread (ptid, new_lwp); | |
a6dbe5df | 596 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 597 | |
a9fa9f7d | 598 | return pid; |
da6d8c04 DJ |
599 | } |
600 | ||
601 | /* Attach to an inferior process. */ | |
602 | ||
95954743 PA |
603 | static void |
604 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 605 | { |
95954743 | 606 | ptid_t ptid; |
54a0b537 | 607 | struct lwp_info *new_lwp; |
611cb4a5 | 608 | |
95954743 | 609 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 610 | { |
95954743 | 611 | if (!initial) |
2d717e4f DJ |
612 | { |
613 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 614 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
615 | strerror (errno), errno); |
616 | fflush (stderr); | |
617 | return; | |
618 | } | |
619 | else | |
620 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 621 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 622 | strerror (errno), errno); |
da6d8c04 DJ |
623 | } |
624 | ||
95954743 PA |
625 | if (initial) |
626 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
627 | ptid = ptid_build (lwpid, lwpid, 0); | |
628 | else | |
629 | { | |
630 | /* Note that extracting the pid from the current inferior is | |
631 | safe, since we're always called in the context of the same | |
632 | process as this new thread. */ | |
633 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
634 | ptid = ptid_build (pid, lwpid, 0); | |
635 | } | |
24a09b5f | 636 | |
95954743 PA |
637 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
638 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 639 | |
a6dbe5df PA |
640 | /* We need to wait for SIGSTOP before being able to make the next |
641 | ptrace call on this LWP. */ | |
642 | new_lwp->must_set_ptrace_flags = 1; | |
643 | ||
0d62e5e8 | 644 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
645 | brings it to a halt. |
646 | ||
647 | There are several cases to consider here: | |
648 | ||
649 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 650 | of a new thread that is being created. |
d50171e4 PA |
651 | In this case we should ignore that SIGSTOP and resume the |
652 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 653 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 654 | resume_continue. |
0e21c1ec DE |
655 | |
656 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
657 | to it via attach_inferior. |
658 | In this case we want the process thread to stop. | |
d50171e4 PA |
659 | This is handled by having linux_attach set last_resume_kind == |
660 | resume_stop after we return. | |
1b3f6016 PA |
661 | ??? If the process already has several threads we leave the other |
662 | threads running. | |
0e21c1ec DE |
663 | |
664 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
665 | existing threads. |
666 | In this case we want the thread to stop. | |
667 | FIXME: This case is currently not properly handled. | |
668 | We should wait for the SIGSTOP but don't. Things work apparently | |
669 | because enough time passes between when we ptrace (ATTACH) and when | |
670 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
671 | |
672 | On the other hand, if we are currently trying to stop all threads, we | |
673 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 674 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
675 | end of the list, and so the new thread has not yet reached |
676 | wait_for_sigstop (but will). */ | |
d50171e4 | 677 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
678 | } |
679 | ||
95954743 PA |
680 | void |
681 | linux_attach_lwp (unsigned long lwpid) | |
682 | { | |
683 | linux_attach_lwp_1 (lwpid, 0); | |
684 | } | |
685 | ||
0d62e5e8 | 686 | int |
a1928bad | 687 | linux_attach (unsigned long pid) |
0d62e5e8 | 688 | { |
95954743 | 689 | linux_attach_lwp_1 (pid, 1); |
95954743 | 690 | linux_add_process (pid, 1); |
0d62e5e8 | 691 | |
bd99dc85 PA |
692 | if (!non_stop) |
693 | { | |
8336d594 PA |
694 | struct thread_info *thread; |
695 | ||
696 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
697 | process. It will be collected by wait shortly. */ | |
698 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
699 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 700 | } |
0d62e5e8 | 701 | |
95954743 PA |
702 | return 0; |
703 | } | |
704 | ||
705 | struct counter | |
706 | { | |
707 | int pid; | |
708 | int count; | |
709 | }; | |
710 | ||
711 | static int | |
712 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
713 | { | |
714 | struct counter *counter = args; | |
715 | ||
716 | if (ptid_get_pid (entry->id) == counter->pid) | |
717 | { | |
718 | if (++counter->count > 1) | |
719 | return 1; | |
720 | } | |
d61ddec4 | 721 | |
da6d8c04 DJ |
722 | return 0; |
723 | } | |
724 | ||
95954743 PA |
725 | static int |
726 | last_thread_of_process_p (struct thread_info *thread) | |
727 | { | |
728 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
729 | int pid = ptid_get_pid (ptid); | |
730 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 731 | |
95954743 PA |
732 | return (find_inferior (&all_threads, |
733 | second_thread_of_pid_p, &counter) == NULL); | |
734 | } | |
735 | ||
736 | /* Kill the inferior lwp. */ | |
737 | ||
738 | static int | |
739 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 740 | { |
0d62e5e8 | 741 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 742 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 743 | int wstat; |
95954743 PA |
744 | int pid = * (int *) args; |
745 | ||
746 | if (ptid_get_pid (entry->id) != pid) | |
747 | return 0; | |
0d62e5e8 | 748 | |
fd500816 DJ |
749 | /* We avoid killing the first thread here, because of a Linux kernel (at |
750 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
751 | the children get a chance to be reaped, it will remain a zombie | |
752 | forever. */ | |
95954743 | 753 | |
12b42a12 | 754 | if (lwpid_of (lwp) == pid) |
95954743 PA |
755 | { |
756 | if (debug_threads) | |
757 | fprintf (stderr, "lkop: is last of process %s\n", | |
758 | target_pid_to_str (entry->id)); | |
759 | return 0; | |
760 | } | |
fd500816 | 761 | |
0d62e5e8 DJ |
762 | do |
763 | { | |
bd99dc85 | 764 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
765 | |
766 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 767 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 768 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
769 | |
770 | return 0; | |
da6d8c04 DJ |
771 | } |
772 | ||
95954743 PA |
773 | static int |
774 | linux_kill (int pid) | |
0d62e5e8 | 775 | { |
95954743 | 776 | struct process_info *process; |
54a0b537 | 777 | struct lwp_info *lwp; |
fd500816 | 778 | int wstat; |
95954743 | 779 | int lwpid; |
fd500816 | 780 | |
95954743 PA |
781 | process = find_process_pid (pid); |
782 | if (process == NULL) | |
783 | return -1; | |
9d606399 | 784 | |
f9e39928 PA |
785 | /* If we're killing a running inferior, make sure it is stopped |
786 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 787 | stop_all_lwps (0, NULL); |
f9e39928 | 788 | |
95954743 | 789 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 790 | |
54a0b537 | 791 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 792 | thread in the list, so do so now. */ |
95954743 | 793 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 PA |
794 | |
795 | if (debug_threads) | |
95954743 PA |
796 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
797 | lwpid_of (lwp), pid); | |
bd99dc85 | 798 | |
fd500816 DJ |
799 | do |
800 | { | |
bd99dc85 | 801 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
802 | |
803 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
804 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
805 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 806 | |
8336d594 | 807 | the_target->mourn (process); |
f9e39928 PA |
808 | |
809 | /* Since we presently can only stop all lwps of all processes, we | |
810 | need to unstop lwps of other processes. */ | |
7984d532 | 811 | unstop_all_lwps (0, NULL); |
95954743 | 812 | return 0; |
0d62e5e8 DJ |
813 | } |
814 | ||
95954743 PA |
815 | static int |
816 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
817 | { |
818 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 819 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
820 | int pid = * (int *) args; |
821 | ||
822 | if (ptid_get_pid (entry->id) != pid) | |
823 | return 0; | |
6ad8ae5c | 824 | |
ae13219e DJ |
825 | /* If this process is stopped but is expecting a SIGSTOP, then make |
826 | sure we take care of that now. This isn't absolutely guaranteed | |
827 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 828 | if (lwp->stop_expected) |
ae13219e | 829 | { |
bd99dc85 | 830 | int wstat; |
ae13219e | 831 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 | 832 | lwp->stop_expected = 0; |
f9e39928 | 833 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 834 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
835 | } |
836 | ||
837 | /* Flush any pending changes to the process's registers. */ | |
838 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 839 | get_lwp_thread (lwp)); |
ae13219e DJ |
840 | |
841 | /* Finally, let it resume. */ | |
bd99dc85 PA |
842 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
843 | ||
844 | delete_lwp (lwp); | |
95954743 | 845 | return 0; |
6ad8ae5c DJ |
846 | } |
847 | ||
95954743 PA |
848 | static int |
849 | linux_detach (int pid) | |
850 | { | |
851 | struct process_info *process; | |
852 | ||
853 | process = find_process_pid (pid); | |
854 | if (process == NULL) | |
855 | return -1; | |
856 | ||
f9e39928 PA |
857 | /* Stop all threads before detaching. First, ptrace requires that |
858 | the thread is stopped to sucessfully detach. Second, thread_db | |
859 | may need to uninstall thread event breakpoints from memory, which | |
860 | only works with a stopped process anyway. */ | |
7984d532 | 861 | stop_all_lwps (0, NULL); |
f9e39928 | 862 | |
ca5c370d | 863 | #ifdef USE_THREAD_DB |
8336d594 | 864 | thread_db_detach (process); |
ca5c370d PA |
865 | #endif |
866 | ||
fa593d66 PA |
867 | /* Stabilize threads (move out of jump pads). */ |
868 | stabilize_threads (); | |
869 | ||
95954743 | 870 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
871 | |
872 | the_target->mourn (process); | |
f9e39928 PA |
873 | |
874 | /* Since we presently can only stop all lwps of all processes, we | |
875 | need to unstop lwps of other processes. */ | |
7984d532 | 876 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
877 | return 0; |
878 | } | |
879 | ||
880 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
881 | ||
882 | static int | |
883 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
884 | { | |
885 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
886 | struct process_info *process = proc; | |
887 | ||
888 | if (pid_of (lwp) == pid_of (process)) | |
889 | delete_lwp (lwp); | |
890 | ||
dd6953e1 | 891 | return 0; |
6ad8ae5c DJ |
892 | } |
893 | ||
8336d594 PA |
894 | static void |
895 | linux_mourn (struct process_info *process) | |
896 | { | |
897 | struct process_info_private *priv; | |
898 | ||
899 | #ifdef USE_THREAD_DB | |
900 | thread_db_mourn (process); | |
901 | #endif | |
902 | ||
f9e39928 PA |
903 | find_inferior (&all_lwps, delete_lwp_callback, process); |
904 | ||
8336d594 PA |
905 | /* Freeing all private data. */ |
906 | priv = process->private; | |
907 | free (priv->arch_private); | |
908 | free (priv); | |
909 | process->private = NULL; | |
505106cd PA |
910 | |
911 | remove_process (process); | |
8336d594 PA |
912 | } |
913 | ||
444d6139 | 914 | static void |
95954743 | 915 | linux_join (int pid) |
444d6139 | 916 | { |
444d6139 | 917 | int status, ret; |
95954743 | 918 | struct process_info *process; |
bd99dc85 | 919 | |
95954743 PA |
920 | process = find_process_pid (pid); |
921 | if (process == NULL) | |
922 | return; | |
444d6139 PA |
923 | |
924 | do { | |
95954743 | 925 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
926 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
927 | break; | |
928 | } while (ret != -1 || errno != ECHILD); | |
929 | } | |
930 | ||
6ad8ae5c | 931 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 932 | static int |
95954743 | 933 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 934 | { |
95954743 PA |
935 | struct lwp_info *lwp = find_lwp_pid (ptid); |
936 | ||
937 | /* We assume we always know if a thread exits. If a whole process | |
938 | exited but we still haven't been able to report it to GDB, we'll | |
939 | hold on to the last lwp of the dead process. */ | |
940 | if (lwp != NULL) | |
941 | return !lwp->dead; | |
0d62e5e8 DJ |
942 | else |
943 | return 0; | |
944 | } | |
945 | ||
6bf5e0ba | 946 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 947 | static int |
d50171e4 | 948 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 949 | { |
54a0b537 | 950 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 951 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 952 | struct thread_info *thread; |
95954743 PA |
953 | |
954 | /* Check if we're only interested in events from a specific process | |
955 | or its lwps. */ | |
956 | if (!ptid_equal (minus_one_ptid, ptid) | |
957 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
958 | return 0; | |
0d62e5e8 | 959 | |
d50171e4 PA |
960 | thread = get_lwp_thread (lwp); |
961 | ||
962 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
963 | report any status pending the LWP may have. */ | |
8336d594 | 964 | if (thread->last_resume_kind == resume_stop |
7984d532 | 965 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 966 | return 0; |
0d62e5e8 | 967 | |
d50171e4 | 968 | return lwp->status_pending_p; |
0d62e5e8 DJ |
969 | } |
970 | ||
95954743 PA |
971 | static int |
972 | same_lwp (struct inferior_list_entry *entry, void *data) | |
973 | { | |
974 | ptid_t ptid = *(ptid_t *) data; | |
975 | int lwp; | |
976 | ||
977 | if (ptid_get_lwp (ptid) != 0) | |
978 | lwp = ptid_get_lwp (ptid); | |
979 | else | |
980 | lwp = ptid_get_pid (ptid); | |
981 | ||
982 | if (ptid_get_lwp (entry->id) == lwp) | |
983 | return 1; | |
984 | ||
985 | return 0; | |
986 | } | |
987 | ||
988 | struct lwp_info * | |
989 | find_lwp_pid (ptid_t ptid) | |
990 | { | |
991 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
992 | } | |
993 | ||
bd99dc85 | 994 | static struct lwp_info * |
95954743 | 995 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 996 | { |
0d62e5e8 | 997 | int ret; |
95954743 | 998 | int to_wait_for = -1; |
bd99dc85 | 999 | struct lwp_info *child = NULL; |
0d62e5e8 | 1000 | |
bd99dc85 | 1001 | if (debug_threads) |
95954743 PA |
1002 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1003 | ||
1004 | if (ptid_equal (ptid, minus_one_ptid)) | |
1005 | to_wait_for = -1; /* any child */ | |
1006 | else | |
1007 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1008 | |
bd99dc85 | 1009 | options |= __WALL; |
0d62e5e8 | 1010 | |
bd99dc85 | 1011 | retry: |
0d62e5e8 | 1012 | |
bd99dc85 PA |
1013 | ret = my_waitpid (to_wait_for, wstatp, options); |
1014 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1015 | return NULL; | |
1016 | else if (ret == -1) | |
1017 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1018 | |
1019 | if (debug_threads | |
1020 | && (!WIFSTOPPED (*wstatp) | |
1021 | || (WSTOPSIG (*wstatp) != 32 | |
1022 | && WSTOPSIG (*wstatp) != 33))) | |
1023 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1024 | ||
95954743 | 1025 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1026 | |
24a09b5f DJ |
1027 | /* If we didn't find a process, one of two things presumably happened: |
1028 | - A process we started and then detached from has exited. Ignore it. | |
1029 | - A process we are controlling has forked and the new child's stop | |
1030 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1031 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1032 | { |
1033 | add_pid_to_list (&stopped_pids, ret); | |
1034 | goto retry; | |
1035 | } | |
bd99dc85 | 1036 | else if (child == NULL) |
24a09b5f DJ |
1037 | goto retry; |
1038 | ||
bd99dc85 | 1039 | child->stopped = 1; |
0d62e5e8 | 1040 | |
bd99dc85 | 1041 | child->last_status = *wstatp; |
32ca6d61 | 1042 | |
d61ddec4 UW |
1043 | /* Architecture-specific setup after inferior is running. |
1044 | This needs to happen after we have attached to the inferior | |
1045 | and it is stopped for the first time, but before we access | |
1046 | any inferior registers. */ | |
1047 | if (new_inferior) | |
1048 | { | |
1049 | the_low_target.arch_setup (); | |
52fa2412 UW |
1050 | #ifdef HAVE_LINUX_REGSETS |
1051 | memset (disabled_regsets, 0, num_regsets); | |
1052 | #endif | |
d61ddec4 UW |
1053 | new_inferior = 0; |
1054 | } | |
1055 | ||
c3adc08c PA |
1056 | /* Fetch the possibly triggered data watchpoint info and store it in |
1057 | CHILD. | |
1058 | ||
1059 | On some archs, like x86, that use debug registers to set | |
1060 | watchpoints, it's possible that the way to know which watched | |
1061 | address trapped, is to check the register that is used to select | |
1062 | which address to watch. Problem is, between setting the | |
1063 | watchpoint and reading back which data address trapped, the user | |
1064 | may change the set of watchpoints, and, as a consequence, GDB | |
1065 | changes the debug registers in the inferior. To avoid reading | |
1066 | back a stale stopped-data-address when that happens, we cache in | |
1067 | LP the fact that a watchpoint trapped, and the corresponding data | |
1068 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1069 | changes the debug registers meanwhile, we have the cached data we | |
1070 | can rely on. */ | |
1071 | ||
1072 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1073 | { | |
1074 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1075 | { | |
1076 | child->stopped_by_watchpoint = 0; | |
1077 | } | |
1078 | else | |
1079 | { | |
1080 | struct thread_info *saved_inferior; | |
1081 | ||
1082 | saved_inferior = current_inferior; | |
1083 | current_inferior = get_lwp_thread (child); | |
1084 | ||
1085 | child->stopped_by_watchpoint | |
1086 | = the_low_target.stopped_by_watchpoint (); | |
1087 | ||
1088 | if (child->stopped_by_watchpoint) | |
1089 | { | |
1090 | if (the_low_target.stopped_data_address != NULL) | |
1091 | child->stopped_data_address | |
1092 | = the_low_target.stopped_data_address (); | |
1093 | else | |
1094 | child->stopped_data_address = 0; | |
1095 | } | |
1096 | ||
1097 | current_inferior = saved_inferior; | |
1098 | } | |
1099 | } | |
1100 | ||
d50171e4 PA |
1101 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1102 | architecture being defined already (so that CHILD has a valid | |
1103 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1104 | not). */ | |
1105 | if (WIFSTOPPED (*wstatp)) | |
1106 | child->stop_pc = get_stop_pc (child); | |
1107 | ||
0d62e5e8 | 1108 | if (debug_threads |
47c0c975 DE |
1109 | && WIFSTOPPED (*wstatp) |
1110 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1111 | { |
896c7fbb | 1112 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1113 | struct regcache *regcache; |
47c0c975 DE |
1114 | CORE_ADDR pc; |
1115 | ||
d50171e4 | 1116 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1117 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1118 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1119 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1120 | current_inferior = saved_inferior; |
0d62e5e8 | 1121 | } |
bd99dc85 PA |
1122 | |
1123 | return child; | |
0d62e5e8 | 1124 | } |
611cb4a5 | 1125 | |
219f2f23 PA |
1126 | /* This function should only be called if the LWP got a SIGTRAP. |
1127 | ||
1128 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1129 | event was handled, 0 otherwise. */ | |
1130 | ||
1131 | static int | |
1132 | handle_tracepoints (struct lwp_info *lwp) | |
1133 | { | |
1134 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1135 | int tpoint_related_event = 0; | |
1136 | ||
7984d532 PA |
1137 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1138 | uninsert tracepoints. To do this, we temporarily pause all | |
1139 | threads, unpatch away, and then unpause threads. We need to make | |
1140 | sure the unpausing doesn't resume LWP too. */ | |
1141 | lwp->suspended++; | |
1142 | ||
219f2f23 PA |
1143 | /* And we need to be sure that any all-threads-stopping doesn't try |
1144 | to move threads out of the jump pads, as it could deadlock the | |
1145 | inferior (LWP could be in the jump pad, maybe even holding the | |
1146 | lock.) */ | |
1147 | ||
1148 | /* Do any necessary step collect actions. */ | |
1149 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1150 | ||
fa593d66 PA |
1151 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1152 | ||
219f2f23 PA |
1153 | /* See if we just hit a tracepoint and do its main collect |
1154 | actions. */ | |
1155 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1156 | ||
7984d532 PA |
1157 | lwp->suspended--; |
1158 | ||
1159 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1160 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1161 | |
219f2f23 PA |
1162 | if (tpoint_related_event) |
1163 | { | |
1164 | if (debug_threads) | |
1165 | fprintf (stderr, "got a tracepoint event\n"); | |
1166 | return 1; | |
1167 | } | |
1168 | ||
1169 | return 0; | |
1170 | } | |
1171 | ||
fa593d66 PA |
1172 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1173 | fast tracepoint. */ | |
1174 | ||
1175 | static int | |
1176 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1177 | struct fast_tpoint_collect_status *status) | |
1178 | { | |
1179 | CORE_ADDR thread_area; | |
1180 | ||
1181 | if (the_low_target.get_thread_area == NULL) | |
1182 | return 0; | |
1183 | ||
1184 | /* Get the thread area address. This is used to recognize which | |
1185 | thread is which when tracing with the in-process agent library. | |
1186 | We don't read anything from the address, and treat it as opaque; | |
1187 | it's the address itself that we assume is unique per-thread. */ | |
1188 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1189 | return 0; | |
1190 | ||
1191 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1192 | } | |
1193 | ||
1194 | /* The reason we resume in the caller, is because we want to be able | |
1195 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1196 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1197 | refuses to resume. */ | |
1198 | ||
1199 | static int | |
1200 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1201 | { | |
1202 | struct thread_info *saved_inferior; | |
1203 | ||
1204 | saved_inferior = current_inferior; | |
1205 | current_inferior = get_lwp_thread (lwp); | |
1206 | ||
1207 | if ((wstat == NULL | |
1208 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1209 | && supports_fast_tracepoints () | |
1210 | && in_process_agent_loaded ()) | |
1211 | { | |
1212 | struct fast_tpoint_collect_status status; | |
1213 | int r; | |
1214 | ||
1215 | if (debug_threads) | |
1216 | fprintf (stderr, "\ | |
1217 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1218 | lwpid_of (lwp)); | |
1219 | ||
1220 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1221 | ||
1222 | if (wstat == NULL | |
1223 | || (WSTOPSIG (*wstat) != SIGILL | |
1224 | && WSTOPSIG (*wstat) != SIGFPE | |
1225 | && WSTOPSIG (*wstat) != SIGSEGV | |
1226 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1227 | { | |
1228 | lwp->collecting_fast_tracepoint = r; | |
1229 | ||
1230 | if (r != 0) | |
1231 | { | |
1232 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1233 | { | |
1234 | /* Haven't executed the original instruction yet. | |
1235 | Set breakpoint there, and wait till it's hit, | |
1236 | then single-step until exiting the jump pad. */ | |
1237 | lwp->exit_jump_pad_bkpt | |
1238 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1239 | } | |
1240 | ||
1241 | if (debug_threads) | |
1242 | fprintf (stderr, "\ | |
1243 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1244 | lwpid_of (lwp)); | |
0cccb683 | 1245 | current_inferior = saved_inferior; |
fa593d66 PA |
1246 | |
1247 | return 1; | |
1248 | } | |
1249 | } | |
1250 | else | |
1251 | { | |
1252 | /* If we get a synchronous signal while collecting, *and* | |
1253 | while executing the (relocated) original instruction, | |
1254 | reset the PC to point at the tpoint address, before | |
1255 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1256 | report the signal to GDB, and pray for the best. */ | |
1257 | ||
1258 | lwp->collecting_fast_tracepoint = 0; | |
1259 | ||
1260 | if (r != 0 | |
1261 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1262 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1263 | { | |
1264 | siginfo_t info; | |
1265 | struct regcache *regcache; | |
1266 | ||
1267 | /* The si_addr on a few signals references the address | |
1268 | of the faulting instruction. Adjust that as | |
1269 | well. */ | |
1270 | if ((WSTOPSIG (*wstat) == SIGILL | |
1271 | || WSTOPSIG (*wstat) == SIGFPE | |
1272 | || WSTOPSIG (*wstat) == SIGBUS | |
1273 | || WSTOPSIG (*wstat) == SIGSEGV) | |
1274 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &info) == 0 | |
1275 | /* Final check just to make sure we don't clobber | |
1276 | the siginfo of non-kernel-sent signals. */ | |
1277 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1278 | { | |
1279 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
1280 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &info); | |
1281 | } | |
1282 | ||
1283 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1284 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1285 | lwp->stop_pc = status.tpoint_addr; | |
1286 | ||
1287 | /* Cancel any fast tracepoint lock this thread was | |
1288 | holding. */ | |
1289 | force_unlock_trace_buffer (); | |
1290 | } | |
1291 | ||
1292 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1293 | { | |
1294 | if (debug_threads) | |
1295 | fprintf (stderr, | |
1296 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1297 | "stopping all threads momentarily.\n"); | |
1298 | ||
1299 | stop_all_lwps (1, lwp); | |
1300 | cancel_breakpoints (); | |
1301 | ||
1302 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1303 | lwp->exit_jump_pad_bkpt = NULL; | |
1304 | ||
1305 | unstop_all_lwps (1, lwp); | |
1306 | ||
1307 | gdb_assert (lwp->suspended >= 0); | |
1308 | } | |
1309 | } | |
1310 | } | |
1311 | ||
1312 | if (debug_threads) | |
1313 | fprintf (stderr, "\ | |
1314 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1315 | lwpid_of (lwp)); | |
0cccb683 YQ |
1316 | |
1317 | current_inferior = saved_inferior; | |
fa593d66 PA |
1318 | return 0; |
1319 | } | |
1320 | ||
1321 | /* Enqueue one signal in the "signals to report later when out of the | |
1322 | jump pad" list. */ | |
1323 | ||
1324 | static void | |
1325 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1326 | { | |
1327 | struct pending_signals *p_sig; | |
1328 | ||
1329 | if (debug_threads) | |
1330 | fprintf (stderr, "\ | |
1331 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1332 | ||
1333 | if (debug_threads) | |
1334 | { | |
1335 | struct pending_signals *sig; | |
1336 | ||
1337 | for (sig = lwp->pending_signals_to_report; | |
1338 | sig != NULL; | |
1339 | sig = sig->prev) | |
1340 | fprintf (stderr, | |
1341 | " Already queued %d\n", | |
1342 | sig->signal); | |
1343 | ||
1344 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1345 | } | |
1346 | ||
1a981360 PA |
1347 | /* Don't enqueue non-RT signals if they are already in the deferred |
1348 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1349 | twice) */ | |
1350 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1351 | { | |
1352 | struct pending_signals *sig; | |
1353 | ||
1354 | for (sig = lwp->pending_signals_to_report; | |
1355 | sig != NULL; | |
1356 | sig = sig->prev) | |
1357 | { | |
1358 | if (sig->signal == WSTOPSIG (*wstat)) | |
1359 | { | |
1360 | if (debug_threads) | |
1361 | fprintf (stderr, | |
1362 | "Not requeuing already queued non-RT signal %d" | |
1363 | " for LWP %ld\n", | |
1364 | sig->signal, | |
1365 | lwpid_of (lwp)); | |
1366 | return; | |
1367 | } | |
1368 | } | |
1369 | } | |
1370 | ||
fa593d66 PA |
1371 | p_sig = xmalloc (sizeof (*p_sig)); |
1372 | p_sig->prev = lwp->pending_signals_to_report; | |
1373 | p_sig->signal = WSTOPSIG (*wstat); | |
1374 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1375 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1376 | ||
1377 | lwp->pending_signals_to_report = p_sig; | |
1378 | } | |
1379 | ||
1380 | /* Dequeue one signal from the "signals to report later when out of | |
1381 | the jump pad" list. */ | |
1382 | ||
1383 | static int | |
1384 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1385 | { | |
1386 | if (lwp->pending_signals_to_report != NULL) | |
1387 | { | |
1388 | struct pending_signals **p_sig; | |
1389 | ||
1390 | p_sig = &lwp->pending_signals_to_report; | |
1391 | while ((*p_sig)->prev != NULL) | |
1392 | p_sig = &(*p_sig)->prev; | |
1393 | ||
1394 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1395 | if ((*p_sig)->info.si_signo != 0) | |
1396 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); | |
1397 | free (*p_sig); | |
1398 | *p_sig = NULL; | |
1399 | ||
1400 | if (debug_threads) | |
1401 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1402 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1403 | ||
1404 | if (debug_threads) | |
1405 | { | |
1406 | struct pending_signals *sig; | |
1407 | ||
1408 | for (sig = lwp->pending_signals_to_report; | |
1409 | sig != NULL; | |
1410 | sig = sig->prev) | |
1411 | fprintf (stderr, | |
1412 | " Still queued %d\n", | |
1413 | sig->signal); | |
1414 | ||
1415 | fprintf (stderr, " (no more queued signals)\n"); | |
1416 | } | |
1417 | ||
1418 | return 1; | |
1419 | } | |
1420 | ||
1421 | return 0; | |
1422 | } | |
1423 | ||
d50171e4 PA |
1424 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1425 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1426 | will handle the current event, eventually we will resume this LWP, | |
1427 | and this breakpoint will trap again. */ | |
1428 | ||
1429 | static int | |
1430 | cancel_breakpoint (struct lwp_info *lwp) | |
1431 | { | |
1432 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1433 | |
1434 | /* There's nothing to do if we don't support breakpoints. */ | |
1435 | if (!supports_breakpoints ()) | |
1436 | return 0; | |
1437 | ||
d50171e4 PA |
1438 | /* breakpoint_at reads from current inferior. */ |
1439 | saved_inferior = current_inferior; | |
1440 | current_inferior = get_lwp_thread (lwp); | |
1441 | ||
1442 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1443 | { | |
1444 | if (debug_threads) | |
1445 | fprintf (stderr, | |
1446 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1447 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1448 | |
1449 | /* Back up the PC if necessary. */ | |
1450 | if (the_low_target.decr_pc_after_break) | |
1451 | { | |
1452 | struct regcache *regcache | |
fc7238bb | 1453 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1454 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1455 | } | |
1456 | ||
1457 | current_inferior = saved_inferior; | |
1458 | return 1; | |
1459 | } | |
1460 | else | |
1461 | { | |
1462 | if (debug_threads) | |
1463 | fprintf (stderr, | |
1464 | "CB: No breakpoint found at %s for [%s]\n", | |
1465 | paddress (lwp->stop_pc), | |
fc7238bb | 1466 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1467 | } |
1468 | ||
1469 | current_inferior = saved_inferior; | |
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | /* When the event-loop is doing a step-over, this points at the thread | |
1474 | being stepped. */ | |
1475 | ptid_t step_over_bkpt; | |
1476 | ||
bd99dc85 PA |
1477 | /* Wait for an event from child PID. If PID is -1, wait for any |
1478 | child. Store the stop status through the status pointer WSTAT. | |
1479 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1480 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1481 | the stopped child otherwise. */ | |
1482 | ||
0d62e5e8 | 1483 | static int |
95954743 | 1484 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1485 | { |
d50171e4 PA |
1486 | struct lwp_info *event_child, *requested_child; |
1487 | ||
d50171e4 PA |
1488 | event_child = NULL; |
1489 | requested_child = NULL; | |
0d62e5e8 | 1490 | |
95954743 | 1491 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1492 | |
95954743 PA |
1493 | if (ptid_equal (ptid, minus_one_ptid) |
1494 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1495 | { |
54a0b537 | 1496 | event_child = (struct lwp_info *) |
d50171e4 | 1497 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1498 | if (debug_threads && event_child) |
bd99dc85 | 1499 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1500 | } |
1501 | else | |
1502 | { | |
95954743 | 1503 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1504 | |
fa593d66 PA |
1505 | if (!stopping_threads |
1506 | && requested_child->status_pending_p | |
1507 | && requested_child->collecting_fast_tracepoint) | |
1508 | { | |
1509 | enqueue_one_deferred_signal (requested_child, | |
1510 | &requested_child->status_pending); | |
1511 | requested_child->status_pending_p = 0; | |
1512 | requested_child->status_pending = 0; | |
1513 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1514 | } | |
1515 | ||
1516 | if (requested_child->suspended | |
1517 | && requested_child->status_pending_p) | |
1518 | fatal ("requesting an event out of a suspended child?"); | |
1519 | ||
d50171e4 | 1520 | if (requested_child->status_pending_p) |
bd99dc85 | 1521 | event_child = requested_child; |
0d62e5e8 | 1522 | } |
611cb4a5 | 1523 | |
0d62e5e8 DJ |
1524 | if (event_child != NULL) |
1525 | { | |
bd99dc85 PA |
1526 | if (debug_threads) |
1527 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1528 | lwpid_of (event_child), event_child->status_pending); | |
1529 | *wstat = event_child->status_pending; | |
1530 | event_child->status_pending_p = 0; | |
1531 | event_child->status_pending = 0; | |
1532 | current_inferior = get_lwp_thread (event_child); | |
1533 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1534 | } |
1535 | ||
1536 | /* We only enter this loop if no process has a pending wait status. Thus | |
1537 | any action taken in response to a wait status inside this loop is | |
1538 | responding as soon as we detect the status, not after any pending | |
1539 | events. */ | |
1540 | while (1) | |
1541 | { | |
6bf5e0ba | 1542 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1543 | |
bd99dc85 | 1544 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1545 | { |
1546 | if (debug_threads) | |
1547 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1548 | return 0; | |
1549 | } | |
0d62e5e8 DJ |
1550 | |
1551 | if (event_child == NULL) | |
1552 | error ("event from unknown child"); | |
611cb4a5 | 1553 | |
bd99dc85 | 1554 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1555 | |
89be2091 | 1556 | /* Check for thread exit. */ |
bd99dc85 | 1557 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1558 | { |
89be2091 | 1559 | if (debug_threads) |
95954743 | 1560 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1561 | |
1562 | /* If the last thread is exiting, just return. */ | |
95954743 | 1563 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1564 | { |
1565 | if (debug_threads) | |
95954743 PA |
1566 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1567 | lwpid_of (event_child)); | |
bd99dc85 PA |
1568 | return lwpid_of (event_child); |
1569 | } | |
89be2091 | 1570 | |
bd99dc85 PA |
1571 | if (!non_stop) |
1572 | { | |
1573 | current_inferior = (struct thread_info *) all_threads.head; | |
1574 | if (debug_threads) | |
1575 | fprintf (stderr, "Current inferior is now %ld\n", | |
1576 | lwpid_of (get_thread_lwp (current_inferior))); | |
1577 | } | |
1578 | else | |
1579 | { | |
1580 | current_inferior = NULL; | |
1581 | if (debug_threads) | |
1582 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1583 | } | |
89be2091 DJ |
1584 | |
1585 | /* If we were waiting for this particular child to do something... | |
1586 | well, it did something. */ | |
bd99dc85 | 1587 | if (requested_child != NULL) |
d50171e4 PA |
1588 | { |
1589 | int lwpid = lwpid_of (event_child); | |
1590 | ||
1591 | /* Cancel the step-over operation --- the thread that | |
1592 | started it is gone. */ | |
1593 | if (finish_step_over (event_child)) | |
7984d532 | 1594 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1595 | delete_lwp (event_child); |
1596 | return lwpid; | |
1597 | } | |
1598 | ||
1599 | delete_lwp (event_child); | |
89be2091 DJ |
1600 | |
1601 | /* Wait for a more interesting event. */ | |
1602 | continue; | |
1603 | } | |
1604 | ||
a6dbe5df PA |
1605 | if (event_child->must_set_ptrace_flags) |
1606 | { | |
1e7fc18c | 1607 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1608 | event_child->must_set_ptrace_flags = 0; |
1609 | } | |
1610 | ||
bd99dc85 PA |
1611 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1612 | && *wstat >> 16 != 0) | |
24a09b5f | 1613 | { |
bd99dc85 | 1614 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1615 | continue; |
1616 | } | |
1617 | ||
d50171e4 PA |
1618 | if (WIFSTOPPED (*wstat) |
1619 | && WSTOPSIG (*wstat) == SIGSTOP | |
1620 | && event_child->stop_expected) | |
1621 | { | |
1622 | int should_stop; | |
1623 | ||
1624 | if (debug_threads) | |
1625 | fprintf (stderr, "Expected stop.\n"); | |
1626 | event_child->stop_expected = 0; | |
1627 | ||
8336d594 | 1628 | should_stop = (current_inferior->last_resume_kind == resume_stop |
d50171e4 PA |
1629 | || stopping_threads); |
1630 | ||
1631 | if (!should_stop) | |
1632 | { | |
1633 | linux_resume_one_lwp (event_child, | |
1634 | event_child->stepping, 0, NULL); | |
1635 | continue; | |
1636 | } | |
1637 | } | |
1638 | ||
bd99dc85 | 1639 | return lwpid_of (event_child); |
611cb4a5 | 1640 | } |
0d62e5e8 | 1641 | |
611cb4a5 DJ |
1642 | /* NOTREACHED */ |
1643 | return 0; | |
1644 | } | |
1645 | ||
95954743 PA |
1646 | static int |
1647 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1648 | { | |
1649 | ptid_t wait_ptid; | |
1650 | ||
1651 | if (ptid_is_pid (ptid)) | |
1652 | { | |
1653 | /* A request to wait for a specific tgid. This is not possible | |
1654 | with waitpid, so instead, we wait for any child, and leave | |
1655 | children we're not interested in right now with a pending | |
1656 | status to report later. */ | |
1657 | wait_ptid = minus_one_ptid; | |
1658 | } | |
1659 | else | |
1660 | wait_ptid = ptid; | |
1661 | ||
1662 | while (1) | |
1663 | { | |
1664 | int event_pid; | |
1665 | ||
1666 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1667 | ||
1668 | if (event_pid > 0 | |
1669 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1670 | { | |
493e2a69 MS |
1671 | struct lwp_info *event_child |
1672 | = find_lwp_pid (pid_to_ptid (event_pid)); | |
95954743 PA |
1673 | |
1674 | if (! WIFSTOPPED (*wstat)) | |
1675 | mark_lwp_dead (event_child, *wstat); | |
1676 | else | |
1677 | { | |
1678 | event_child->status_pending_p = 1; | |
1679 | event_child->status_pending = *wstat; | |
1680 | } | |
1681 | } | |
1682 | else | |
1683 | return event_pid; | |
1684 | } | |
1685 | } | |
1686 | ||
6bf5e0ba PA |
1687 | |
1688 | /* Count the LWP's that have had events. */ | |
1689 | ||
1690 | static int | |
1691 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1692 | { | |
1693 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1694 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1695 | int *count = data; |
1696 | ||
1697 | gdb_assert (count != NULL); | |
1698 | ||
1699 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1700 | should be reported to GDB. */ | |
8336d594 PA |
1701 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1702 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
1703 | && lp->status_pending_p |
1704 | && WIFSTOPPED (lp->status_pending) | |
1705 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1706 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1707 | (*count)++; | |
1708 | ||
1709 | return 0; | |
1710 | } | |
1711 | ||
1712 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1713 | ||
1714 | static int | |
1715 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1716 | { | |
1717 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1718 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 1719 | |
8336d594 PA |
1720 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1721 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
1722 | && lp->status_pending_p) |
1723 | return 1; | |
1724 | else | |
1725 | return 0; | |
1726 | } | |
1727 | ||
1728 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1729 | reported to GDB. */ | |
1730 | ||
1731 | static int | |
1732 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1733 | { | |
1734 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1735 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1736 | int *selector = data; |
1737 | ||
1738 | gdb_assert (selector != NULL); | |
1739 | ||
1740 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
1741 | if (thread->last_resume_kind != resume_stop |
1742 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1743 | && lp->status_pending_p |
1744 | && WIFSTOPPED (lp->status_pending) | |
1745 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1746 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1747 | if ((*selector)-- == 0) | |
1748 | return 1; | |
1749 | ||
1750 | return 0; | |
1751 | } | |
1752 | ||
1753 | static int | |
1754 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
1755 | { | |
1756 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1757 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1758 | struct lwp_info *event_lp = data; |
1759 | ||
1760 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1761 | if (lp == event_lp) | |
1762 | return 0; | |
1763 | ||
1764 | /* If a LWP other than the LWP that we're reporting an event for has | |
1765 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1766 | then just arrange for it to hit it again later. We don't keep | |
1767 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1768 | LWP. We will handle the current event, eventually we will resume | |
1769 | all LWPs, and this one will get its breakpoint trap again. | |
1770 | ||
1771 | If we do not do this, then we run the risk that the user will | |
1772 | delete or disable the breakpoint, but the LWP will have already | |
1773 | tripped on it. */ | |
1774 | ||
8336d594 PA |
1775 | if (thread->last_resume_kind != resume_stop |
1776 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1777 | && lp->status_pending_p |
1778 | && WIFSTOPPED (lp->status_pending) | |
1779 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
1780 | && !lp->stepping |
1781 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
1782 | && cancel_breakpoint (lp)) |
1783 | /* Throw away the SIGTRAP. */ | |
1784 | lp->status_pending_p = 0; | |
1785 | ||
1786 | return 0; | |
1787 | } | |
1788 | ||
7984d532 PA |
1789 | static void |
1790 | linux_cancel_breakpoints (void) | |
1791 | { | |
1792 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
1793 | } | |
1794 | ||
6bf5e0ba PA |
1795 | /* Select one LWP out of those that have events pending. */ |
1796 | ||
1797 | static void | |
1798 | select_event_lwp (struct lwp_info **orig_lp) | |
1799 | { | |
1800 | int num_events = 0; | |
1801 | int random_selector; | |
1802 | struct lwp_info *event_lp; | |
1803 | ||
1804 | /* Give preference to any LWP that is being single-stepped. */ | |
1805 | event_lp | |
1806 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1807 | select_singlestep_lwp_callback, NULL); | |
1808 | if (event_lp != NULL) | |
1809 | { | |
1810 | if (debug_threads) | |
1811 | fprintf (stderr, | |
1812 | "SEL: Select single-step %s\n", | |
1813 | target_pid_to_str (ptid_of (event_lp))); | |
1814 | } | |
1815 | else | |
1816 | { | |
1817 | /* No single-stepping LWP. Select one at random, out of those | |
1818 | which have had SIGTRAP events. */ | |
1819 | ||
1820 | /* First see how many SIGTRAP events we have. */ | |
1821 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
1822 | ||
1823 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1824 | random_selector = (int) | |
1825 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1826 | ||
1827 | if (debug_threads && num_events > 1) | |
1828 | fprintf (stderr, | |
1829 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1830 | num_events, random_selector); | |
1831 | ||
1832 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
1833 | select_event_lwp_callback, | |
1834 | &random_selector); | |
1835 | } | |
1836 | ||
1837 | if (event_lp != NULL) | |
1838 | { | |
1839 | /* Switch the event LWP. */ | |
1840 | *orig_lp = event_lp; | |
1841 | } | |
1842 | } | |
1843 | ||
7984d532 PA |
1844 | /* Decrement the suspend count of an LWP. */ |
1845 | ||
1846 | static int | |
1847 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
1848 | { | |
1849 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1850 | ||
1851 | /* Ignore EXCEPT. */ | |
1852 | if (lwp == except) | |
1853 | return 0; | |
1854 | ||
1855 | lwp->suspended--; | |
1856 | ||
1857 | gdb_assert (lwp->suspended >= 0); | |
1858 | return 0; | |
1859 | } | |
1860 | ||
1861 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
1862 | NULL. */ | |
1863 | ||
1864 | static void | |
1865 | unsuspend_all_lwps (struct lwp_info *except) | |
1866 | { | |
1867 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
1868 | } | |
1869 | ||
fa593d66 PA |
1870 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
1871 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
1872 | void *data); | |
1873 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
1874 | static ptid_t linux_wait_1 (ptid_t ptid, | |
1875 | struct target_waitstatus *ourstatus, | |
1876 | int target_options); | |
1877 | ||
1878 | /* Stabilize threads (move out of jump pads). | |
1879 | ||
1880 | If a thread is midway collecting a fast tracepoint, we need to | |
1881 | finish the collection and move it out of the jump pad before | |
1882 | reporting the signal. | |
1883 | ||
1884 | This avoids recursion while collecting (when a signal arrives | |
1885 | midway, and the signal handler itself collects), which would trash | |
1886 | the trace buffer. In case the user set a breakpoint in a signal | |
1887 | handler, this avoids the backtrace showing the jump pad, etc.. | |
1888 | Most importantly, there are certain things we can't do safely if | |
1889 | threads are stopped in a jump pad (or in its callee's). For | |
1890 | example: | |
1891 | ||
1892 | - starting a new trace run. A thread still collecting the | |
1893 | previous run, could trash the trace buffer when resumed. The trace | |
1894 | buffer control structures would have been reset but the thread had | |
1895 | no way to tell. The thread could even midway memcpy'ing to the | |
1896 | buffer, which would mean that when resumed, it would clobber the | |
1897 | trace buffer that had been set for a new run. | |
1898 | ||
1899 | - we can't rewrite/reuse the jump pads for new tracepoints | |
1900 | safely. Say you do tstart while a thread is stopped midway while | |
1901 | collecting. When the thread is later resumed, it finishes the | |
1902 | collection, and returns to the jump pad, to execute the original | |
1903 | instruction that was under the tracepoint jump at the time the | |
1904 | older run had been started. If the jump pad had been rewritten | |
1905 | since for something else in the new run, the thread would now | |
1906 | execute the wrong / random instructions. */ | |
1907 | ||
1908 | static void | |
1909 | linux_stabilize_threads (void) | |
1910 | { | |
1911 | struct thread_info *save_inferior; | |
1912 | struct lwp_info *lwp_stuck; | |
1913 | ||
1914 | lwp_stuck | |
1915 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1916 | stuck_in_jump_pad_callback, NULL); | |
1917 | if (lwp_stuck != NULL) | |
1918 | { | |
b4d51a55 PA |
1919 | if (debug_threads) |
1920 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
1921 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
1922 | return; |
1923 | } | |
1924 | ||
1925 | save_inferior = current_inferior; | |
1926 | ||
1927 | stabilizing_threads = 1; | |
1928 | ||
1929 | /* Kick 'em all. */ | |
1930 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
1931 | ||
1932 | /* Loop until all are stopped out of the jump pads. */ | |
1933 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
1934 | { | |
1935 | struct target_waitstatus ourstatus; | |
1936 | struct lwp_info *lwp; | |
fa593d66 PA |
1937 | int wstat; |
1938 | ||
1939 | /* Note that we go through the full wait even loop. While | |
1940 | moving threads out of jump pad, we need to be able to step | |
1941 | over internal breakpoints and such. */ | |
32fcada3 | 1942 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
1943 | |
1944 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
1945 | { | |
1946 | lwp = get_thread_lwp (current_inferior); | |
1947 | ||
1948 | /* Lock it. */ | |
1949 | lwp->suspended++; | |
1950 | ||
1951 | if (ourstatus.value.sig != TARGET_SIGNAL_0 | |
1952 | || current_inferior->last_resume_kind == resume_stop) | |
1953 | { | |
1954 | wstat = W_STOPCODE (target_signal_to_host (ourstatus.value.sig)); | |
1955 | enqueue_one_deferred_signal (lwp, &wstat); | |
1956 | } | |
1957 | } | |
1958 | } | |
1959 | ||
1960 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
1961 | ||
1962 | stabilizing_threads = 0; | |
1963 | ||
1964 | current_inferior = save_inferior; | |
1965 | ||
b4d51a55 | 1966 | if (debug_threads) |
fa593d66 | 1967 | { |
b4d51a55 PA |
1968 | lwp_stuck |
1969 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1970 | stuck_in_jump_pad_callback, NULL); | |
1971 | if (lwp_stuck != NULL) | |
fa593d66 PA |
1972 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
1973 | lwpid_of (lwp_stuck)); | |
1974 | } | |
1975 | } | |
1976 | ||
0d62e5e8 | 1977 | /* Wait for process, returns status. */ |
da6d8c04 | 1978 | |
95954743 PA |
1979 | static ptid_t |
1980 | linux_wait_1 (ptid_t ptid, | |
1981 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1982 | { |
e5f1222d | 1983 | int w; |
fc7238bb | 1984 | struct lwp_info *event_child; |
bd99dc85 | 1985 | int options; |
bd99dc85 | 1986 | int pid; |
6bf5e0ba PA |
1987 | int step_over_finished; |
1988 | int bp_explains_trap; | |
1989 | int maybe_internal_trap; | |
1990 | int report_to_gdb; | |
219f2f23 | 1991 | int trace_event; |
bd99dc85 PA |
1992 | |
1993 | /* Translate generic target options into linux options. */ | |
1994 | options = __WALL; | |
1995 | if (target_options & TARGET_WNOHANG) | |
1996 | options |= WNOHANG; | |
0d62e5e8 DJ |
1997 | |
1998 | retry: | |
fa593d66 PA |
1999 | bp_explains_trap = 0; |
2000 | trace_event = 0; | |
bd99dc85 PA |
2001 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2002 | ||
0d62e5e8 DJ |
2003 | /* If we were only supposed to resume one thread, only wait for |
2004 | that thread - if it's still alive. If it died, however - which | |
2005 | can happen if we're coming from the thread death case below - | |
2006 | then we need to make sure we restart the other threads. We could | |
2007 | pick a thread at random or restart all; restarting all is less | |
2008 | arbitrary. */ | |
95954743 PA |
2009 | if (!non_stop |
2010 | && !ptid_equal (cont_thread, null_ptid) | |
2011 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2012 | { |
fc7238bb PA |
2013 | struct thread_info *thread; |
2014 | ||
bd99dc85 PA |
2015 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2016 | cont_thread); | |
0d62e5e8 DJ |
2017 | |
2018 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2019 | if (thread == NULL) |
64386c31 DJ |
2020 | { |
2021 | struct thread_resume resume_info; | |
95954743 | 2022 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2023 | resume_info.kind = resume_continue; |
2024 | resume_info.sig = 0; | |
2bd7c093 | 2025 | linux_resume (&resume_info, 1); |
64386c31 | 2026 | } |
bd99dc85 | 2027 | else |
95954743 | 2028 | ptid = cont_thread; |
0d62e5e8 | 2029 | } |
da6d8c04 | 2030 | |
6bf5e0ba PA |
2031 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2032 | pid = linux_wait_for_event (ptid, &w, options); | |
2033 | else | |
2034 | { | |
2035 | if (debug_threads) | |
2036 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2037 | target_pid_to_str (step_over_bkpt)); | |
2038 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2039 | } | |
2040 | ||
bd99dc85 | 2041 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2042 | return null_ptid; |
bd99dc85 | 2043 | |
6bf5e0ba | 2044 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2045 | |
0d62e5e8 DJ |
2046 | /* If we are waiting for a particular child, and it exited, |
2047 | linux_wait_for_event will return its exit status. Similarly if | |
2048 | the last child exited. If this is not the last child, however, | |
2049 | do not report it as exited until there is a 'thread exited' response | |
2050 | available in the remote protocol. Instead, just wait for another event. | |
2051 | This should be safe, because if the thread crashed we will already | |
2052 | have reported the termination signal to GDB; that should stop any | |
2053 | in-progress stepping operations, etc. | |
2054 | ||
2055 | Report the exit status of the last thread to exit. This matches | |
2056 | LinuxThreads' behavior. */ | |
2057 | ||
95954743 | 2058 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2059 | { |
bd99dc85 | 2060 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2061 | { |
bd99dc85 PA |
2062 | if (WIFEXITED (w)) |
2063 | { | |
2064 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2065 | ourstatus->value.integer = WEXITSTATUS (w); | |
2066 | ||
2067 | if (debug_threads) | |
493e2a69 MS |
2068 | fprintf (stderr, |
2069 | "\nChild exited with retcode = %x \n", | |
2070 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2071 | } |
2072 | else | |
2073 | { | |
2074 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2075 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
2076 | ||
2077 | if (debug_threads) | |
493e2a69 MS |
2078 | fprintf (stderr, |
2079 | "\nChild terminated with signal = %x \n", | |
2080 | WTERMSIG (w)); | |
bd99dc85 PA |
2081 | |
2082 | } | |
5b1c542e | 2083 | |
3e4c1235 | 2084 | return ptid_of (event_child); |
0d62e5e8 | 2085 | } |
da6d8c04 | 2086 | } |
0d62e5e8 | 2087 | else |
da6d8c04 | 2088 | { |
0d62e5e8 DJ |
2089 | if (!WIFSTOPPED (w)) |
2090 | goto retry; | |
da6d8c04 DJ |
2091 | } |
2092 | ||
6bf5e0ba PA |
2093 | /* If this event was not handled before, and is not a SIGTRAP, we |
2094 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2095 | a breakpoint is inserted at the current PC. If this target does | |
2096 | not support internal breakpoints at all, we also report the | |
2097 | SIGTRAP without further processing; it's of no concern to us. */ | |
2098 | maybe_internal_trap | |
2099 | = (supports_breakpoints () | |
2100 | && (WSTOPSIG (w) == SIGTRAP | |
2101 | || ((WSTOPSIG (w) == SIGILL | |
2102 | || WSTOPSIG (w) == SIGSEGV) | |
2103 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2104 | ||
2105 | if (maybe_internal_trap) | |
2106 | { | |
2107 | /* Handle anything that requires bookkeeping before deciding to | |
2108 | report the event or continue waiting. */ | |
2109 | ||
2110 | /* First check if we can explain the SIGTRAP with an internal | |
2111 | breakpoint, or if we should possibly report the event to GDB. | |
2112 | Do this before anything that may remove or insert a | |
2113 | breakpoint. */ | |
2114 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2115 | ||
2116 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2117 | finished. If so, tweak the state machine accordingly, | |
2118 | reinsert breakpoints and delete any reinsert (software | |
2119 | single-step) breakpoints. */ | |
2120 | step_over_finished = finish_step_over (event_child); | |
2121 | ||
2122 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2123 | check_breakpoints (event_child->stop_pc); | |
2124 | ||
219f2f23 PA |
2125 | /* Handle tracepoint data collecting. This may overflow the |
2126 | trace buffer, and cause a tracing stop, removing | |
2127 | breakpoints. */ | |
2128 | trace_event = handle_tracepoints (event_child); | |
2129 | ||
6bf5e0ba PA |
2130 | if (bp_explains_trap) |
2131 | { | |
2132 | /* If we stepped or ran into an internal breakpoint, we've | |
2133 | already handled it. So next time we resume (from this | |
2134 | PC), we should step over it. */ | |
2135 | if (debug_threads) | |
2136 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2137 | ||
8b07ae33 PA |
2138 | if (breakpoint_here (event_child->stop_pc)) |
2139 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2140 | } |
2141 | } | |
2142 | else | |
2143 | { | |
2144 | /* We have some other signal, possibly a step-over dance was in | |
2145 | progress, and it should be cancelled too. */ | |
2146 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2147 | } |
2148 | ||
2149 | /* We have all the data we need. Either report the event to GDB, or | |
2150 | resume threads and keep waiting for more. */ | |
2151 | ||
2152 | /* If we're collecting a fast tracepoint, finish the collection and | |
2153 | move out of the jump pad before delivering a signal. See | |
2154 | linux_stabilize_threads. */ | |
2155 | ||
2156 | if (WIFSTOPPED (w) | |
2157 | && WSTOPSIG (w) != SIGTRAP | |
2158 | && supports_fast_tracepoints () | |
2159 | && in_process_agent_loaded ()) | |
2160 | { | |
2161 | if (debug_threads) | |
2162 | fprintf (stderr, | |
2163 | "Got signal %d for LWP %ld. Check if we need " | |
2164 | "to defer or adjust it.\n", | |
2165 | WSTOPSIG (w), lwpid_of (event_child)); | |
2166 | ||
2167 | /* Allow debugging the jump pad itself. */ | |
2168 | if (current_inferior->last_resume_kind != resume_step | |
2169 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2170 | { | |
2171 | enqueue_one_deferred_signal (event_child, &w); | |
2172 | ||
2173 | if (debug_threads) | |
2174 | fprintf (stderr, | |
2175 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2176 | WSTOPSIG (w), lwpid_of (event_child)); | |
2177 | ||
2178 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2179 | goto retry; | |
2180 | } | |
2181 | } | |
219f2f23 | 2182 | |
fa593d66 PA |
2183 | if (event_child->collecting_fast_tracepoint) |
2184 | { | |
2185 | if (debug_threads) | |
2186 | fprintf (stderr, "\ | |
2187 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2188 | Check if we're already there.\n", | |
2189 | lwpid_of (event_child), | |
2190 | event_child->collecting_fast_tracepoint); | |
2191 | ||
2192 | trace_event = 1; | |
2193 | ||
2194 | event_child->collecting_fast_tracepoint | |
2195 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2196 | ||
2197 | if (event_child->collecting_fast_tracepoint != 1) | |
2198 | { | |
2199 | /* No longer need this breakpoint. */ | |
2200 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2201 | { | |
2202 | if (debug_threads) | |
2203 | fprintf (stderr, | |
2204 | "No longer need exit-jump-pad bkpt; removing it." | |
2205 | "stopping all threads momentarily.\n"); | |
2206 | ||
2207 | /* Other running threads could hit this breakpoint. | |
2208 | We don't handle moribund locations like GDB does, | |
2209 | instead we always pause all threads when removing | |
2210 | breakpoints, so that any step-over or | |
2211 | decr_pc_after_break adjustment is always taken | |
2212 | care of while the breakpoint is still | |
2213 | inserted. */ | |
2214 | stop_all_lwps (1, event_child); | |
2215 | cancel_breakpoints (); | |
2216 | ||
2217 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2218 | event_child->exit_jump_pad_bkpt = NULL; | |
2219 | ||
2220 | unstop_all_lwps (1, event_child); | |
2221 | ||
2222 | gdb_assert (event_child->suspended >= 0); | |
2223 | } | |
2224 | } | |
2225 | ||
2226 | if (event_child->collecting_fast_tracepoint == 0) | |
2227 | { | |
2228 | if (debug_threads) | |
2229 | fprintf (stderr, | |
2230 | "fast tracepoint finished " | |
2231 | "collecting successfully.\n"); | |
2232 | ||
2233 | /* We may have a deferred signal to report. */ | |
2234 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2235 | { | |
2236 | if (debug_threads) | |
2237 | fprintf (stderr, "dequeued one signal.\n"); | |
2238 | } | |
3c11dd79 | 2239 | else |
fa593d66 | 2240 | { |
3c11dd79 PA |
2241 | if (debug_threads) |
2242 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2243 | |
2244 | if (stabilizing_threads) | |
2245 | { | |
2246 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
2247 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2248 | return ptid_of (event_child); | |
2249 | } | |
2250 | } | |
2251 | } | |
6bf5e0ba PA |
2252 | } |
2253 | ||
e471f25b PA |
2254 | /* Check whether GDB would be interested in this event. */ |
2255 | ||
2256 | /* If GDB is not interested in this signal, don't stop other | |
2257 | threads, and don't report it to GDB. Just resume the inferior | |
2258 | right away. We do this for threading-related signals as well as | |
2259 | any that GDB specifically requested we ignore. But never ignore | |
2260 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2261 | stepping - they may require special handling to skip the signal | |
2262 | handler. */ | |
2263 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2264 | thread library? */ | |
2265 | if (WIFSTOPPED (w) | |
2266 | && current_inferior->last_resume_kind != resume_step | |
2267 | && ( | |
1a981360 | 2268 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2269 | (current_process ()->private->thread_db != NULL |
2270 | && (WSTOPSIG (w) == __SIGRTMIN | |
2271 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2272 | || | |
2273 | #endif | |
2274 | (pass_signals[target_signal_from_host (WSTOPSIG (w))] | |
2275 | && !(WSTOPSIG (w) == SIGSTOP | |
2276 | && current_inferior->last_resume_kind == resume_stop)))) | |
2277 | { | |
2278 | siginfo_t info, *info_p; | |
2279 | ||
2280 | if (debug_threads) | |
2281 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2282 | WSTOPSIG (w), lwpid_of (event_child)); | |
2283 | ||
2284 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) | |
2285 | info_p = &info; | |
2286 | else | |
2287 | info_p = NULL; | |
2288 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2289 | WSTOPSIG (w), info_p); | |
2290 | goto retry; | |
2291 | } | |
2292 | ||
2293 | /* If GDB wanted this thread to single step, we always want to | |
2294 | report the SIGTRAP, and let GDB handle it. Watchpoints should | |
2295 | always be reported. So should signals we can't explain. A | |
2296 | SIGTRAP we can't explain could be a GDB breakpoint --- we may or | |
2297 | not support Z0 breakpoints. If we do, we're be able to handle | |
2298 | GDB breakpoints on top of internal breakpoints, by handling the | |
2299 | internal breakpoint and still reporting the event to GDB. If we | |
2300 | don't, we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 2301 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 2302 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 2303 | || event_child->stopped_by_watchpoint |
493e2a69 MS |
2304 | || (!step_over_finished |
2305 | && !bp_explains_trap && !trace_event) | |
8b07ae33 | 2306 | || gdb_breakpoint_here (event_child->stop_pc)); |
6bf5e0ba PA |
2307 | |
2308 | /* We found no reason GDB would want us to stop. We either hit one | |
2309 | of our own breakpoints, or finished an internal step GDB | |
2310 | shouldn't know about. */ | |
2311 | if (!report_to_gdb) | |
2312 | { | |
2313 | if (debug_threads) | |
2314 | { | |
2315 | if (bp_explains_trap) | |
2316 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2317 | if (step_over_finished) | |
2318 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2319 | if (trace_event) |
2320 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
2321 | } |
2322 | ||
2323 | /* We're not reporting this breakpoint to GDB, so apply the | |
2324 | decr_pc_after_break adjustment to the inferior's regcache | |
2325 | ourselves. */ | |
2326 | ||
2327 | if (the_low_target.set_pc != NULL) | |
2328 | { | |
2329 | struct regcache *regcache | |
2330 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2331 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2332 | } | |
2333 | ||
7984d532 PA |
2334 | /* We may have finished stepping over a breakpoint. If so, |
2335 | we've stopped and suspended all LWPs momentarily except the | |
2336 | stepping one. This is where we resume them all again. We're | |
2337 | going to keep waiting, so use proceed, which handles stepping | |
2338 | over the next breakpoint. */ | |
6bf5e0ba PA |
2339 | if (debug_threads) |
2340 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2341 | |
2342 | if (step_over_finished) | |
2343 | unsuspend_all_lwps (event_child); | |
2344 | ||
6bf5e0ba PA |
2345 | proceed_all_lwps (); |
2346 | goto retry; | |
2347 | } | |
2348 | ||
2349 | if (debug_threads) | |
2350 | { | |
8336d594 | 2351 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
2352 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
2353 | if (event_child->stopped_by_watchpoint) | |
2354 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2355 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2356 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2357 | if (debug_threads) |
2358 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2359 | } | |
2360 | ||
2361 | /* Alright, we're going to report a stop. */ | |
2362 | ||
fa593d66 | 2363 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2364 | { |
2365 | /* In all-stop, stop all threads. */ | |
7984d532 | 2366 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2367 | |
2368 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2369 | from among those that have had events. Giving equal priority | |
2370 | to all LWPs that have had events helps prevent | |
2371 | starvation. */ | |
2372 | if (ptid_equal (ptid, minus_one_ptid)) | |
2373 | { | |
2374 | event_child->status_pending_p = 1; | |
2375 | event_child->status_pending = w; | |
2376 | ||
2377 | select_event_lwp (&event_child); | |
2378 | ||
2379 | event_child->status_pending_p = 0; | |
2380 | w = event_child->status_pending; | |
2381 | } | |
2382 | ||
2383 | /* Now that we've selected our final event LWP, cancel any | |
2384 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2385 | See the comment in cancel_breakpoints_callback to find out | |
2386 | why. */ | |
2387 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 PA |
2388 | |
2389 | /* Stabilize threads (move out of jump pads). */ | |
2390 | stabilize_threads (); | |
6bf5e0ba PA |
2391 | } |
2392 | else | |
2393 | { | |
2394 | /* If we just finished a step-over, then all threads had been | |
2395 | momentarily paused. In all-stop, that's fine, we want | |
2396 | threads stopped by now anyway. In non-stop, we need to | |
2397 | re-resume threads that GDB wanted to be running. */ | |
2398 | if (step_over_finished) | |
7984d532 | 2399 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2400 | } |
2401 | ||
5b1c542e | 2402 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2403 | |
8336d594 PA |
2404 | if (current_inferior->last_resume_kind == resume_stop |
2405 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2406 | { |
2407 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2408 | and it stopped cleanly, so report as SIG0. The use of | |
2409 | SIGSTOP is an implementation detail. */ | |
2410 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2411 | } | |
8336d594 PA |
2412 | else if (current_inferior->last_resume_kind == resume_stop |
2413 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2414 | { |
2415 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2416 | but, it stopped for other reasons. */ |
bd99dc85 PA |
2417 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
2418 | } | |
2419 | else | |
2420 | { | |
2421 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
2422 | } | |
2423 | ||
d50171e4 PA |
2424 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2425 | ||
bd99dc85 | 2426 | if (debug_threads) |
95954743 | 2427 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2428 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2429 | ourstatus->kind, |
2430 | ourstatus->value.sig); | |
2431 | ||
6bf5e0ba | 2432 | return ptid_of (event_child); |
bd99dc85 PA |
2433 | } |
2434 | ||
2435 | /* Get rid of any pending event in the pipe. */ | |
2436 | static void | |
2437 | async_file_flush (void) | |
2438 | { | |
2439 | int ret; | |
2440 | char buf; | |
2441 | ||
2442 | do | |
2443 | ret = read (linux_event_pipe[0], &buf, 1); | |
2444 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2445 | } | |
2446 | ||
2447 | /* Put something in the pipe, so the event loop wakes up. */ | |
2448 | static void | |
2449 | async_file_mark (void) | |
2450 | { | |
2451 | int ret; | |
2452 | ||
2453 | async_file_flush (); | |
2454 | ||
2455 | do | |
2456 | ret = write (linux_event_pipe[1], "+", 1); | |
2457 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2458 | ||
2459 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2460 | be awakened anyway. */ | |
2461 | } | |
2462 | ||
95954743 PA |
2463 | static ptid_t |
2464 | linux_wait (ptid_t ptid, | |
2465 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2466 | { |
95954743 | 2467 | ptid_t event_ptid; |
bd99dc85 PA |
2468 | |
2469 | if (debug_threads) | |
95954743 | 2470 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2471 | |
2472 | /* Flush the async file first. */ | |
2473 | if (target_is_async_p ()) | |
2474 | async_file_flush (); | |
2475 | ||
95954743 | 2476 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2477 | |
2478 | /* If at least one stop was reported, there may be more. A single | |
2479 | SIGCHLD can signal more than one child stop. */ | |
2480 | if (target_is_async_p () | |
2481 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2482 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2483 | async_file_mark (); |
2484 | ||
2485 | return event_ptid; | |
da6d8c04 DJ |
2486 | } |
2487 | ||
c5f62d5f | 2488 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2489 | |
2490 | static int | |
a1928bad | 2491 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2492 | { |
c5f62d5f DE |
2493 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2494 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2495 | |
c5f62d5f DE |
2496 | #ifdef __NR_tkill |
2497 | { | |
2498 | static int tkill_failed; | |
fd500816 | 2499 | |
c5f62d5f DE |
2500 | if (!tkill_failed) |
2501 | { | |
2502 | int ret; | |
2503 | ||
2504 | errno = 0; | |
2505 | ret = syscall (__NR_tkill, lwpid, signo); | |
2506 | if (errno != ENOSYS) | |
2507 | return ret; | |
2508 | tkill_failed = 1; | |
2509 | } | |
2510 | } | |
fd500816 DJ |
2511 | #endif |
2512 | ||
2513 | return kill (lwpid, signo); | |
2514 | } | |
2515 | ||
964e4306 PA |
2516 | void |
2517 | linux_stop_lwp (struct lwp_info *lwp) | |
2518 | { | |
2519 | send_sigstop (lwp); | |
2520 | } | |
2521 | ||
0d62e5e8 | 2522 | static void |
02fc4de7 | 2523 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2524 | { |
bd99dc85 | 2525 | int pid; |
0d62e5e8 | 2526 | |
bd99dc85 PA |
2527 | pid = lwpid_of (lwp); |
2528 | ||
0d62e5e8 DJ |
2529 | /* If we already have a pending stop signal for this process, don't |
2530 | send another. */ | |
54a0b537 | 2531 | if (lwp->stop_expected) |
0d62e5e8 | 2532 | { |
ae13219e | 2533 | if (debug_threads) |
bd99dc85 | 2534 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2535 | |
0d62e5e8 DJ |
2536 | return; |
2537 | } | |
2538 | ||
2539 | if (debug_threads) | |
bd99dc85 | 2540 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2541 | |
d50171e4 | 2542 | lwp->stop_expected = 1; |
bd99dc85 | 2543 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2544 | } |
2545 | ||
7984d532 PA |
2546 | static int |
2547 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2548 | { |
2549 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2550 | ||
7984d532 PA |
2551 | /* Ignore EXCEPT. */ |
2552 | if (lwp == except) | |
2553 | return 0; | |
2554 | ||
02fc4de7 | 2555 | if (lwp->stopped) |
7984d532 | 2556 | return 0; |
02fc4de7 PA |
2557 | |
2558 | send_sigstop (lwp); | |
7984d532 PA |
2559 | return 0; |
2560 | } | |
2561 | ||
2562 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2563 | yet. */ | |
2564 | static int | |
2565 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2566 | void *except) | |
2567 | { | |
2568 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2569 | ||
2570 | /* Ignore EXCEPT. */ | |
2571 | if (lwp == except) | |
2572 | return 0; | |
2573 | ||
2574 | lwp->suspended++; | |
2575 | ||
2576 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2577 | } |
2578 | ||
95954743 PA |
2579 | static void |
2580 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2581 | { | |
2582 | /* It's dead, really. */ | |
2583 | lwp->dead = 1; | |
2584 | ||
2585 | /* Store the exit status for later. */ | |
2586 | lwp->status_pending_p = 1; | |
2587 | lwp->status_pending = wstat; | |
2588 | ||
95954743 PA |
2589 | /* Prevent trying to stop it. */ |
2590 | lwp->stopped = 1; | |
2591 | ||
2592 | /* No further stops are expected from a dead lwp. */ | |
2593 | lwp->stop_expected = 0; | |
2594 | } | |
2595 | ||
0d62e5e8 DJ |
2596 | static void |
2597 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2598 | { | |
54a0b537 | 2599 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2600 | struct thread_info *saved_inferior; |
a1928bad | 2601 | int wstat; |
95954743 PA |
2602 | ptid_t saved_tid; |
2603 | ptid_t ptid; | |
d50171e4 | 2604 | int pid; |
0d62e5e8 | 2605 | |
54a0b537 | 2606 | if (lwp->stopped) |
d50171e4 PA |
2607 | { |
2608 | if (debug_threads) | |
2609 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2610 | lwpid_of (lwp)); | |
2611 | return; | |
2612 | } | |
0d62e5e8 DJ |
2613 | |
2614 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2615 | if (saved_inferior != NULL) |
2616 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2617 | else | |
95954743 | 2618 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2619 | |
95954743 | 2620 | ptid = lwp->head.id; |
bd99dc85 | 2621 | |
d50171e4 PA |
2622 | if (debug_threads) |
2623 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2624 | ||
2625 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2626 | |
2627 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2628 | and record the pending SIGSTOP. If the process exited, just | |
2629 | return. */ | |
d50171e4 | 2630 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2631 | { |
2632 | if (debug_threads) | |
d50171e4 PA |
2633 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2634 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2635 | |
d50171e4 | 2636 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2637 | { |
2638 | if (debug_threads) | |
d50171e4 PA |
2639 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2640 | lwpid_of (lwp), wstat); | |
2641 | ||
c35fafde PA |
2642 | lwp->status_pending_p = 1; |
2643 | lwp->status_pending = wstat; | |
2644 | } | |
0d62e5e8 | 2645 | } |
d50171e4 | 2646 | else |
95954743 PA |
2647 | { |
2648 | if (debug_threads) | |
d50171e4 | 2649 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2650 | |
d50171e4 PA |
2651 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2652 | if (lwp) | |
2653 | { | |
2654 | /* Leave this status pending for the next time we're able to | |
2655 | report it. In the mean time, we'll report this lwp as | |
2656 | dead to GDB, so GDB doesn't try to read registers and | |
2657 | memory from it. This can only happen if this was the | |
2658 | last thread of the process; otherwise, PID is removed | |
2659 | from the thread tables before linux_wait_for_event | |
2660 | returns. */ | |
2661 | mark_lwp_dead (lwp, wstat); | |
2662 | } | |
95954743 | 2663 | } |
0d62e5e8 | 2664 | |
bd99dc85 | 2665 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2666 | current_inferior = saved_inferior; |
2667 | else | |
2668 | { | |
2669 | if (debug_threads) | |
2670 | fprintf (stderr, "Previously current thread died.\n"); | |
2671 | ||
bd99dc85 PA |
2672 | if (non_stop) |
2673 | { | |
2674 | /* We can't change the current inferior behind GDB's back, | |
2675 | otherwise, a subsequent command may apply to the wrong | |
2676 | process. */ | |
2677 | current_inferior = NULL; | |
2678 | } | |
2679 | else | |
2680 | { | |
2681 | /* Set a valid thread as current. */ | |
2682 | set_desired_inferior (0); | |
2683 | } | |
0d62e5e8 DJ |
2684 | } |
2685 | } | |
2686 | ||
fa593d66 PA |
2687 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
2688 | move it out, because we need to report the stop event to GDB. For | |
2689 | example, if the user puts a breakpoint in the jump pad, it's | |
2690 | because she wants to debug it. */ | |
2691 | ||
2692 | static int | |
2693 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
2694 | { | |
2695 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2696 | struct thread_info *thread = get_lwp_thread (lwp); | |
2697 | ||
2698 | gdb_assert (lwp->suspended == 0); | |
2699 | gdb_assert (lwp->stopped); | |
2700 | ||
2701 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
2702 | return (supports_fast_tracepoints () | |
2703 | && in_process_agent_loaded () | |
2704 | && (gdb_breakpoint_here (lwp->stop_pc) | |
2705 | || lwp->stopped_by_watchpoint | |
2706 | || thread->last_resume_kind == resume_step) | |
2707 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
2708 | } | |
2709 | ||
2710 | static void | |
2711 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
2712 | { | |
2713 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2714 | struct thread_info *thread = get_lwp_thread (lwp); | |
2715 | int *wstat; | |
2716 | ||
2717 | gdb_assert (lwp->suspended == 0); | |
2718 | gdb_assert (lwp->stopped); | |
2719 | ||
2720 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
2721 | ||
2722 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
2723 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
2724 | && !lwp->stopped_by_watchpoint | |
2725 | && thread->last_resume_kind != resume_step | |
2726 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
2727 | { | |
2728 | if (debug_threads) | |
2729 | fprintf (stderr, | |
2730 | "LWP %ld needs stabilizing (in jump pad)\n", | |
2731 | lwpid_of (lwp)); | |
2732 | ||
2733 | if (wstat) | |
2734 | { | |
2735 | lwp->status_pending_p = 0; | |
2736 | enqueue_one_deferred_signal (lwp, wstat); | |
2737 | ||
2738 | if (debug_threads) | |
2739 | fprintf (stderr, | |
2740 | "Signal %d for LWP %ld deferred " | |
2741 | "(in jump pad)\n", | |
2742 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
2743 | } | |
2744 | ||
2745 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
2746 | } | |
2747 | else | |
2748 | lwp->suspended++; | |
2749 | } | |
2750 | ||
2751 | static int | |
2752 | lwp_running (struct inferior_list_entry *entry, void *data) | |
2753 | { | |
2754 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2755 | ||
2756 | if (lwp->dead) | |
2757 | return 0; | |
2758 | if (lwp->stopped) | |
2759 | return 0; | |
2760 | return 1; | |
2761 | } | |
2762 | ||
7984d532 PA |
2763 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
2764 | If SUSPEND, then also increase the suspend count of every LWP, | |
2765 | except EXCEPT. */ | |
2766 | ||
0d62e5e8 | 2767 | static void |
7984d532 | 2768 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 DJ |
2769 | { |
2770 | stopping_threads = 1; | |
7984d532 PA |
2771 | |
2772 | if (suspend) | |
2773 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
2774 | else | |
2775 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 2776 | for_each_inferior (&all_lwps, wait_for_sigstop); |
0d62e5e8 DJ |
2777 | stopping_threads = 0; |
2778 | } | |
2779 | ||
da6d8c04 DJ |
2780 | /* Resume execution of the inferior process. |
2781 | If STEP is nonzero, single-step it. | |
2782 | If SIGNAL is nonzero, give it that signal. */ | |
2783 | ||
ce3a066d | 2784 | static void |
2acc282a | 2785 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 2786 | int step, int signal, siginfo_t *info) |
da6d8c04 | 2787 | { |
0d62e5e8 | 2788 | struct thread_info *saved_inferior; |
fa593d66 | 2789 | int fast_tp_collecting; |
0d62e5e8 | 2790 | |
54a0b537 | 2791 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
2792 | return; |
2793 | ||
fa593d66 PA |
2794 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
2795 | ||
2796 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
2797 | ||
219f2f23 PA |
2798 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
2799 | user used the "jump" command, or "set $pc = foo"). */ | |
2800 | if (lwp->stop_pc != get_pc (lwp)) | |
2801 | { | |
2802 | /* Collecting 'while-stepping' actions doesn't make sense | |
2803 | anymore. */ | |
2804 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
2805 | } | |
2806 | ||
0d62e5e8 DJ |
2807 | /* If we have pending signals or status, and a new signal, enqueue the |
2808 | signal. Also enqueue the signal if we are waiting to reinsert a | |
2809 | breakpoint; it will be picked up again below. */ | |
2810 | if (signal != 0 | |
fa593d66 PA |
2811 | && (lwp->status_pending_p |
2812 | || lwp->pending_signals != NULL | |
2813 | || lwp->bp_reinsert != 0 | |
2814 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
2815 | { |
2816 | struct pending_signals *p_sig; | |
bca929d3 | 2817 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 2818 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 2819 | p_sig->signal = signal; |
32ca6d61 DJ |
2820 | if (info == NULL) |
2821 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2822 | else | |
2823 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 2824 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
2825 | } |
2826 | ||
d50171e4 PA |
2827 | if (lwp->status_pending_p) |
2828 | { | |
2829 | if (debug_threads) | |
2830 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
2831 | " has pending status\n", | |
2832 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
2833 | lwp->stop_expected ? "expected" : "not expected"); | |
2834 | return; | |
2835 | } | |
0d62e5e8 DJ |
2836 | |
2837 | saved_inferior = current_inferior; | |
54a0b537 | 2838 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
2839 | |
2840 | if (debug_threads) | |
1b3f6016 | 2841 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 2842 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 2843 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
2844 | |
2845 | /* This bit needs some thinking about. If we get a signal that | |
2846 | we must report while a single-step reinsert is still pending, | |
2847 | we often end up resuming the thread. It might be better to | |
2848 | (ew) allow a stack of pending events; then we could be sure that | |
2849 | the reinsert happened right away and not lose any signals. | |
2850 | ||
2851 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 2852 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
2853 | complete correctness, so it won't solve that problem. It may be |
2854 | worthwhile just to solve this one, however. */ | |
54a0b537 | 2855 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
2856 | { |
2857 | if (debug_threads) | |
d50171e4 PA |
2858 | fprintf (stderr, " pending reinsert at 0x%s\n", |
2859 | paddress (lwp->bp_reinsert)); | |
2860 | ||
2861 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
2862 | { | |
fa593d66 PA |
2863 | if (fast_tp_collecting == 0) |
2864 | { | |
2865 | if (step == 0) | |
2866 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
2867 | if (lwp->suspended) | |
2868 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
2869 | lwp->suspended); | |
2870 | } | |
d50171e4 PA |
2871 | |
2872 | step = 1; | |
2873 | } | |
0d62e5e8 DJ |
2874 | |
2875 | /* Postpone any pending signal. It was enqueued above. */ | |
2876 | signal = 0; | |
2877 | } | |
2878 | ||
fa593d66 PA |
2879 | if (fast_tp_collecting == 1) |
2880 | { | |
2881 | if (debug_threads) | |
2882 | fprintf (stderr, "\ | |
2883 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
2884 | lwpid_of (lwp)); | |
2885 | ||
2886 | /* Postpone any pending signal. It was enqueued above. */ | |
2887 | signal = 0; | |
2888 | } | |
2889 | else if (fast_tp_collecting == 2) | |
2890 | { | |
2891 | if (debug_threads) | |
2892 | fprintf (stderr, "\ | |
2893 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
2894 | lwpid_of (lwp)); | |
2895 | ||
2896 | if (can_hardware_single_step ()) | |
2897 | step = 1; | |
2898 | else | |
2899 | fatal ("moving out of jump pad single-stepping" | |
2900 | " not implemented on this target"); | |
2901 | ||
2902 | /* Postpone any pending signal. It was enqueued above. */ | |
2903 | signal = 0; | |
2904 | } | |
2905 | ||
219f2f23 PA |
2906 | /* If we have while-stepping actions in this thread set it stepping. |
2907 | If we have a signal to deliver, it may or may not be set to | |
2908 | SIG_IGN, we don't know. Assume so, and allow collecting | |
2909 | while-stepping into a signal handler. A possible smart thing to | |
2910 | do would be to set an internal breakpoint at the signal return | |
2911 | address, continue, and carry on catching this while-stepping | |
2912 | action only when that breakpoint is hit. A future | |
2913 | enhancement. */ | |
2914 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
2915 | && can_hardware_single_step ()) | |
2916 | { | |
2917 | if (debug_threads) | |
2918 | fprintf (stderr, | |
2919 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
2920 | lwpid_of (lwp)); | |
2921 | step = 1; | |
2922 | } | |
2923 | ||
aa691b87 | 2924 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 2925 | { |
442ea881 PA |
2926 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
2927 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 2928 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
2929 | } |
2930 | ||
fa593d66 PA |
2931 | /* If we have pending signals, consume one unless we are trying to |
2932 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
2933 | collect. */ | |
2934 | if (lwp->pending_signals != NULL | |
2935 | && lwp->bp_reinsert == 0 | |
2936 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
2937 | { |
2938 | struct pending_signals **p_sig; | |
2939 | ||
54a0b537 | 2940 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
2941 | while ((*p_sig)->prev != NULL) |
2942 | p_sig = &(*p_sig)->prev; | |
2943 | ||
2944 | signal = (*p_sig)->signal; | |
32ca6d61 | 2945 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 2946 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 2947 | |
0d62e5e8 DJ |
2948 | free (*p_sig); |
2949 | *p_sig = NULL; | |
2950 | } | |
2951 | ||
aa5ca48f DE |
2952 | if (the_low_target.prepare_to_resume != NULL) |
2953 | the_low_target.prepare_to_resume (lwp); | |
2954 | ||
0d62e5e8 | 2955 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 2956 | get_lwp_thread (lwp)); |
da6d8c04 | 2957 | errno = 0; |
54a0b537 | 2958 | lwp->stopped = 0; |
c3adc08c | 2959 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 2960 | lwp->stepping = step; |
14ce3065 DE |
2961 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
2962 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2963 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2964 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
2965 | |
2966 | current_inferior = saved_inferior; | |
da6d8c04 | 2967 | if (errno) |
3221518c UW |
2968 | { |
2969 | /* ESRCH from ptrace either means that the thread was already | |
2970 | running (an error) or that it is gone (a race condition). If | |
2971 | it's gone, we will get a notification the next time we wait, | |
2972 | so we can ignore the error. We could differentiate these | |
2973 | two, but it's tricky without waiting; the thread still exists | |
2974 | as a zombie, so sending it signal 0 would succeed. So just | |
2975 | ignore ESRCH. */ | |
2976 | if (errno == ESRCH) | |
2977 | return; | |
2978 | ||
2979 | perror_with_name ("ptrace"); | |
2980 | } | |
da6d8c04 DJ |
2981 | } |
2982 | ||
2bd7c093 PA |
2983 | struct thread_resume_array |
2984 | { | |
2985 | struct thread_resume *resume; | |
2986 | size_t n; | |
2987 | }; | |
64386c31 DJ |
2988 | |
2989 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
2990 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
2991 | resume request. | |
2992 | ||
2993 | This algorithm is O(threads * resume elements), but resume elements | |
2994 | is small (and will remain small at least until GDB supports thread | |
2995 | suspension). */ | |
2bd7c093 PA |
2996 | static int |
2997 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 2998 | { |
54a0b537 | 2999 | struct lwp_info *lwp; |
64386c31 | 3000 | struct thread_info *thread; |
5544ad89 | 3001 | int ndx; |
2bd7c093 | 3002 | struct thread_resume_array *r; |
64386c31 DJ |
3003 | |
3004 | thread = (struct thread_info *) entry; | |
54a0b537 | 3005 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3006 | r = arg; |
64386c31 | 3007 | |
2bd7c093 | 3008 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3009 | { |
3010 | ptid_t ptid = r->resume[ndx].thread; | |
3011 | if (ptid_equal (ptid, minus_one_ptid) | |
3012 | || ptid_equal (ptid, entry->id) | |
3013 | || (ptid_is_pid (ptid) | |
3014 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
3015 | || (ptid_get_lwp (ptid) == -1 | |
3016 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
3017 | { | |
d50171e4 | 3018 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3019 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3020 | { |
3021 | if (debug_threads) | |
3022 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3023 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3024 | ? "stopped" | |
3025 | : "stopping", | |
3026 | lwpid_of (lwp)); | |
3027 | ||
3028 | continue; | |
3029 | } | |
3030 | ||
95954743 | 3031 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3032 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 PA |
3033 | |
3034 | /* If we had a deferred signal to report, dequeue one now. | |
3035 | This can happen if LWP gets more than one signal while | |
3036 | trying to get out of a jump pad. */ | |
3037 | if (lwp->stopped | |
3038 | && !lwp->status_pending_p | |
3039 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3040 | { | |
3041 | lwp->status_pending_p = 1; | |
3042 | ||
3043 | if (debug_threads) | |
3044 | fprintf (stderr, | |
3045 | "Dequeueing deferred signal %d for LWP %ld, " | |
3046 | "leaving status pending.\n", | |
3047 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3048 | } | |
3049 | ||
95954743 PA |
3050 | return 0; |
3051 | } | |
3052 | } | |
2bd7c093 PA |
3053 | |
3054 | /* No resume action for this thread. */ | |
3055 | lwp->resume = NULL; | |
64386c31 | 3056 | |
2bd7c093 | 3057 | return 0; |
5544ad89 DJ |
3058 | } |
3059 | ||
5544ad89 | 3060 | |
bd99dc85 PA |
3061 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3062 | static int | |
3063 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3064 | { |
bd99dc85 | 3065 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3066 | |
bd99dc85 PA |
3067 | /* LWPs which will not be resumed are not interesting, because |
3068 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3069 | if (lwp->resume == NULL) |
bd99dc85 | 3070 | return 0; |
64386c31 | 3071 | |
bd99dc85 | 3072 | if (lwp->status_pending_p) |
d50171e4 PA |
3073 | * (int *) flag_p = 1; |
3074 | ||
3075 | return 0; | |
3076 | } | |
3077 | ||
3078 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3079 | internal breakpoint that we need to step over. It assumes that any | |
3080 | required STOP_PC adjustment has already been propagated to the | |
3081 | inferior's regcache. */ | |
3082 | ||
3083 | static int | |
3084 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3085 | { | |
3086 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3087 | struct thread_info *thread; |
d50171e4 PA |
3088 | struct thread_info *saved_inferior; |
3089 | CORE_ADDR pc; | |
3090 | ||
3091 | /* LWPs which will not be resumed are not interesting, because we | |
3092 | might not wait for them next time through linux_wait. */ | |
3093 | ||
3094 | if (!lwp->stopped) | |
3095 | { | |
3096 | if (debug_threads) | |
3097 | fprintf (stderr, | |
3098 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3099 | lwpid_of (lwp)); | |
3100 | return 0; | |
3101 | } | |
3102 | ||
8336d594 PA |
3103 | thread = get_lwp_thread (lwp); |
3104 | ||
3105 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3106 | { |
3107 | if (debug_threads) | |
3108 | fprintf (stderr, | |
3109 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3110 | lwpid_of (lwp)); | |
3111 | return 0; | |
3112 | } | |
3113 | ||
7984d532 PA |
3114 | gdb_assert (lwp->suspended >= 0); |
3115 | ||
3116 | if (lwp->suspended) | |
3117 | { | |
3118 | if (debug_threads) | |
3119 | fprintf (stderr, | |
3120 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3121 | lwpid_of (lwp)); | |
3122 | return 0; | |
3123 | } | |
3124 | ||
d50171e4 PA |
3125 | if (!lwp->need_step_over) |
3126 | { | |
3127 | if (debug_threads) | |
3128 | fprintf (stderr, | |
3129 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3130 | } | |
5544ad89 | 3131 | |
bd99dc85 | 3132 | if (lwp->status_pending_p) |
d50171e4 PA |
3133 | { |
3134 | if (debug_threads) | |
3135 | fprintf (stderr, | |
3136 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3137 | lwpid_of (lwp)); | |
3138 | return 0; | |
3139 | } | |
3140 | ||
3141 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3142 | or we have. */ | |
3143 | pc = get_pc (lwp); | |
3144 | ||
3145 | /* If the PC has changed since we stopped, then don't do anything, | |
3146 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3147 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3148 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3149 | command, or poked thread's registers herself. */ | |
3150 | if (pc != lwp->stop_pc) | |
3151 | { | |
3152 | if (debug_threads) | |
3153 | fprintf (stderr, | |
3154 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3155 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3156 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3157 | ||
3158 | lwp->need_step_over = 0; | |
3159 | return 0; | |
3160 | } | |
3161 | ||
3162 | saved_inferior = current_inferior; | |
8336d594 | 3163 | current_inferior = thread; |
d50171e4 | 3164 | |
8b07ae33 | 3165 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3166 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3167 | { |
8b07ae33 PA |
3168 | /* Don't step over a breakpoint that GDB expects to hit |
3169 | though. */ | |
3170 | if (gdb_breakpoint_here (pc)) | |
3171 | { | |
3172 | if (debug_threads) | |
3173 | fprintf (stderr, | |
3174 | "Need step over [LWP %ld]? yes, but found" | |
3175 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3176 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3177 | |
8b07ae33 PA |
3178 | current_inferior = saved_inferior; |
3179 | return 0; | |
3180 | } | |
3181 | else | |
3182 | { | |
3183 | if (debug_threads) | |
3184 | fprintf (stderr, | |
493e2a69 MS |
3185 | "Need step over [LWP %ld]? yes, " |
3186 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3187 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3188 | |
8b07ae33 PA |
3189 | /* We've found an lwp that needs stepping over --- return 1 so |
3190 | that find_inferior stops looking. */ | |
3191 | current_inferior = saved_inferior; | |
3192 | ||
3193 | /* If the step over is cancelled, this is set again. */ | |
3194 | lwp->need_step_over = 0; | |
3195 | return 1; | |
3196 | } | |
d50171e4 PA |
3197 | } |
3198 | ||
3199 | current_inferior = saved_inferior; | |
3200 | ||
3201 | if (debug_threads) | |
3202 | fprintf (stderr, | |
3203 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3204 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3205 | |
bd99dc85 | 3206 | return 0; |
5544ad89 DJ |
3207 | } |
3208 | ||
d50171e4 PA |
3209 | /* Start a step-over operation on LWP. When LWP stopped at a |
3210 | breakpoint, to make progress, we need to remove the breakpoint out | |
3211 | of the way. If we let other threads run while we do that, they may | |
3212 | pass by the breakpoint location and miss hitting it. To avoid | |
3213 | that, a step-over momentarily stops all threads while LWP is | |
3214 | single-stepped while the breakpoint is temporarily uninserted from | |
3215 | the inferior. When the single-step finishes, we reinsert the | |
3216 | breakpoint, and let all threads that are supposed to be running, | |
3217 | run again. | |
3218 | ||
3219 | On targets that don't support hardware single-step, we don't | |
3220 | currently support full software single-stepping. Instead, we only | |
3221 | support stepping over the thread event breakpoint, by asking the | |
3222 | low target where to place a reinsert breakpoint. Since this | |
3223 | routine assumes the breakpoint being stepped over is a thread event | |
3224 | breakpoint, it usually assumes the return address of the current | |
3225 | function is a good enough place to set the reinsert breakpoint. */ | |
3226 | ||
3227 | static int | |
3228 | start_step_over (struct lwp_info *lwp) | |
3229 | { | |
3230 | struct thread_info *saved_inferior; | |
3231 | CORE_ADDR pc; | |
3232 | int step; | |
3233 | ||
3234 | if (debug_threads) | |
3235 | fprintf (stderr, | |
3236 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3237 | lwpid_of (lwp)); | |
3238 | ||
7984d532 PA |
3239 | stop_all_lwps (1, lwp); |
3240 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3241 | |
3242 | if (debug_threads) | |
3243 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3244 | ||
3245 | /* Note, we should always reach here with an already adjusted PC, | |
3246 | either by GDB (if we're resuming due to GDB's request), or by our | |
3247 | caller, if we just finished handling an internal breakpoint GDB | |
3248 | shouldn't care about. */ | |
3249 | pc = get_pc (lwp); | |
3250 | ||
3251 | saved_inferior = current_inferior; | |
3252 | current_inferior = get_lwp_thread (lwp); | |
3253 | ||
3254 | lwp->bp_reinsert = pc; | |
3255 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3256 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3257 | |
3258 | if (can_hardware_single_step ()) | |
3259 | { | |
3260 | step = 1; | |
3261 | } | |
3262 | else | |
3263 | { | |
3264 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3265 | set_reinsert_breakpoint (raddr); | |
3266 | step = 0; | |
3267 | } | |
3268 | ||
3269 | current_inferior = saved_inferior; | |
3270 | ||
3271 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3272 | ||
3273 | /* Require next event from this LWP. */ | |
3274 | step_over_bkpt = lwp->head.id; | |
3275 | return 1; | |
3276 | } | |
3277 | ||
3278 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3279 | start_step_over, if still there, and delete any reinsert | |
3280 | breakpoints we've set, on non hardware single-step targets. */ | |
3281 | ||
3282 | static int | |
3283 | finish_step_over (struct lwp_info *lwp) | |
3284 | { | |
3285 | if (lwp->bp_reinsert != 0) | |
3286 | { | |
3287 | if (debug_threads) | |
3288 | fprintf (stderr, "Finished step over.\n"); | |
3289 | ||
3290 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3291 | may be no breakpoint to reinsert there by now. */ | |
3292 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3293 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3294 | |
3295 | lwp->bp_reinsert = 0; | |
3296 | ||
3297 | /* Delete any software-single-step reinsert breakpoints. No | |
3298 | longer needed. We don't have to worry about other threads | |
3299 | hitting this trap, and later not being able to explain it, | |
3300 | because we were stepping over a breakpoint, and we hold all | |
3301 | threads but LWP stopped while doing that. */ | |
3302 | if (!can_hardware_single_step ()) | |
3303 | delete_reinsert_breakpoints (); | |
3304 | ||
3305 | step_over_bkpt = null_ptid; | |
3306 | return 1; | |
3307 | } | |
3308 | else | |
3309 | return 0; | |
3310 | } | |
3311 | ||
5544ad89 DJ |
3312 | /* This function is called once per thread. We check the thread's resume |
3313 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3314 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3315 | |
bd99dc85 PA |
3316 | For threads which we aren't explicitly told otherwise, we preserve |
3317 | the stepping flag; this is used for stepping over gdbserver-placed | |
3318 | breakpoints. | |
3319 | ||
3320 | If pending_flags was set in any thread, we queue any needed | |
3321 | signals, since we won't actually resume. We already have a pending | |
3322 | event to report, so we don't need to preserve any step requests; | |
3323 | they should be re-issued if necessary. */ | |
3324 | ||
3325 | static int | |
3326 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3327 | { |
54a0b537 | 3328 | struct lwp_info *lwp; |
5544ad89 | 3329 | struct thread_info *thread; |
bd99dc85 | 3330 | int step; |
d50171e4 PA |
3331 | int leave_all_stopped = * (int *) arg; |
3332 | int leave_pending; | |
5544ad89 DJ |
3333 | |
3334 | thread = (struct thread_info *) entry; | |
54a0b537 | 3335 | lwp = get_thread_lwp (thread); |
5544ad89 | 3336 | |
2bd7c093 | 3337 | if (lwp->resume == NULL) |
bd99dc85 | 3338 | return 0; |
5544ad89 | 3339 | |
bd99dc85 | 3340 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3341 | { |
bd99dc85 | 3342 | if (debug_threads) |
d50171e4 | 3343 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3344 | |
3345 | if (!lwp->stopped) | |
3346 | { | |
3347 | if (debug_threads) | |
d50171e4 | 3348 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3349 | |
d50171e4 PA |
3350 | /* Stop the thread, and wait for the event asynchronously, |
3351 | through the event loop. */ | |
02fc4de7 | 3352 | send_sigstop (lwp); |
bd99dc85 PA |
3353 | } |
3354 | else | |
3355 | { | |
3356 | if (debug_threads) | |
d50171e4 PA |
3357 | fprintf (stderr, "already stopped LWP %ld\n", |
3358 | lwpid_of (lwp)); | |
3359 | ||
3360 | /* The LWP may have been stopped in an internal event that | |
3361 | was not meant to be notified back to GDB (e.g., gdbserver | |
3362 | breakpoint), so we should be reporting a stop event in | |
3363 | this case too. */ | |
3364 | ||
3365 | /* If the thread already has a pending SIGSTOP, this is a | |
3366 | no-op. Otherwise, something later will presumably resume | |
3367 | the thread and this will cause it to cancel any pending | |
3368 | operation, due to last_resume_kind == resume_stop. If | |
3369 | the thread already has a pending status to report, we | |
3370 | will still report it the next time we wait - see | |
3371 | status_pending_p_callback. */ | |
1a981360 PA |
3372 | |
3373 | /* If we already have a pending signal to report, then | |
3374 | there's no need to queue a SIGSTOP, as this means we're | |
3375 | midway through moving the LWP out of the jumppad, and we | |
3376 | will report the pending signal as soon as that is | |
3377 | finished. */ | |
3378 | if (lwp->pending_signals_to_report == NULL) | |
3379 | send_sigstop (lwp); | |
bd99dc85 | 3380 | } |
32ca6d61 | 3381 | |
bd99dc85 PA |
3382 | /* For stop requests, we're done. */ |
3383 | lwp->resume = NULL; | |
fc7238bb | 3384 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3385 | return 0; |
5544ad89 DJ |
3386 | } |
3387 | ||
bd99dc85 PA |
3388 | /* If this thread which is about to be resumed has a pending status, |
3389 | then don't resume any threads - we can just report the pending | |
3390 | status. Make sure to queue any signals that would otherwise be | |
3391 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3392 | thread has a pending status. If there's a thread that needs the |
3393 | step-over-breakpoint dance, then don't resume any other thread | |
3394 | but that particular one. */ | |
3395 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3396 | |
d50171e4 | 3397 | if (!leave_pending) |
bd99dc85 PA |
3398 | { |
3399 | if (debug_threads) | |
3400 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3401 | |
d50171e4 | 3402 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3403 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3404 | } |
3405 | else | |
3406 | { | |
3407 | if (debug_threads) | |
3408 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3409 | |
bd99dc85 PA |
3410 | /* If we have a new signal, enqueue the signal. */ |
3411 | if (lwp->resume->sig != 0) | |
3412 | { | |
3413 | struct pending_signals *p_sig; | |
3414 | p_sig = xmalloc (sizeof (*p_sig)); | |
3415 | p_sig->prev = lwp->pending_signals; | |
3416 | p_sig->signal = lwp->resume->sig; | |
3417 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3418 | ||
3419 | /* If this is the same signal we were previously stopped by, | |
3420 | make sure to queue its siginfo. We can ignore the return | |
3421 | value of ptrace; if it fails, we'll skip | |
3422 | PTRACE_SETSIGINFO. */ | |
3423 | if (WIFSTOPPED (lwp->last_status) | |
3424 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
3425 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
3426 | ||
3427 | lwp->pending_signals = p_sig; | |
3428 | } | |
3429 | } | |
5544ad89 | 3430 | |
fc7238bb | 3431 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3432 | lwp->resume = NULL; |
5544ad89 | 3433 | return 0; |
0d62e5e8 DJ |
3434 | } |
3435 | ||
3436 | static void | |
2bd7c093 | 3437 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3438 | { |
2bd7c093 | 3439 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3440 | struct lwp_info *need_step_over = NULL; |
3441 | int any_pending; | |
3442 | int leave_all_stopped; | |
c6ecbae5 | 3443 | |
2bd7c093 | 3444 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3445 | |
d50171e4 PA |
3446 | /* If there is a thread which would otherwise be resumed, which has |
3447 | a pending status, then don't resume any threads - we can just | |
3448 | report the pending status. Make sure to queue any signals that | |
3449 | would otherwise be sent. In non-stop mode, we'll apply this | |
3450 | logic to each thread individually. We consume all pending events | |
3451 | before considering to start a step-over (in all-stop). */ | |
3452 | any_pending = 0; | |
bd99dc85 | 3453 | if (!non_stop) |
d50171e4 PA |
3454 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3455 | ||
3456 | /* If there is a thread which would otherwise be resumed, which is | |
3457 | stopped at a breakpoint that needs stepping over, then don't | |
3458 | resume any threads - have it step over the breakpoint with all | |
3459 | other threads stopped, then resume all threads again. Make sure | |
3460 | to queue any signals that would otherwise be delivered or | |
3461 | queued. */ | |
3462 | if (!any_pending && supports_breakpoints ()) | |
3463 | need_step_over | |
3464 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3465 | need_step_over_p, NULL); | |
3466 | ||
3467 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3468 | ||
3469 | if (debug_threads) | |
3470 | { | |
3471 | if (need_step_over != NULL) | |
3472 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3473 | else if (any_pending) | |
3474 | fprintf (stderr, | |
3475 | "Not resuming, all-stop and found " | |
3476 | "an LWP with pending status\n"); | |
3477 | else | |
3478 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3479 | } | |
3480 | ||
3481 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3482 | otherwise deliver. */ | |
3483 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3484 | ||
3485 | if (need_step_over) | |
3486 | start_step_over (need_step_over); | |
3487 | } | |
3488 | ||
3489 | /* This function is called once per thread. We check the thread's | |
3490 | last resume request, which will tell us whether to resume, step, or | |
3491 | leave the thread stopped. Any signal the client requested to be | |
3492 | delivered has already been enqueued at this point. | |
3493 | ||
3494 | If any thread that GDB wants running is stopped at an internal | |
3495 | breakpoint that needs stepping over, we start a step-over operation | |
3496 | on that particular thread, and leave all others stopped. */ | |
3497 | ||
7984d532 PA |
3498 | static int |
3499 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3500 | { |
7984d532 | 3501 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3502 | struct thread_info *thread; |
d50171e4 PA |
3503 | int step; |
3504 | ||
7984d532 PA |
3505 | if (lwp == except) |
3506 | return 0; | |
d50171e4 PA |
3507 | |
3508 | if (debug_threads) | |
3509 | fprintf (stderr, | |
3510 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3511 | ||
3512 | if (!lwp->stopped) | |
3513 | { | |
3514 | if (debug_threads) | |
3515 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3516 | return 0; |
d50171e4 PA |
3517 | } |
3518 | ||
8336d594 PA |
3519 | thread = get_lwp_thread (lwp); |
3520 | ||
02fc4de7 PA |
3521 | if (thread->last_resume_kind == resume_stop |
3522 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3523 | { |
3524 | if (debug_threads) | |
02fc4de7 PA |
3525 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3526 | lwpid_of (lwp)); | |
7984d532 | 3527 | return 0; |
d50171e4 PA |
3528 | } |
3529 | ||
3530 | if (lwp->status_pending_p) | |
3531 | { | |
3532 | if (debug_threads) | |
3533 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3534 | lwpid_of (lwp)); | |
7984d532 | 3535 | return 0; |
d50171e4 PA |
3536 | } |
3537 | ||
7984d532 PA |
3538 | gdb_assert (lwp->suspended >= 0); |
3539 | ||
d50171e4 PA |
3540 | if (lwp->suspended) |
3541 | { | |
3542 | if (debug_threads) | |
3543 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3544 | return 0; |
d50171e4 PA |
3545 | } |
3546 | ||
1a981360 PA |
3547 | if (thread->last_resume_kind == resume_stop |
3548 | && lwp->pending_signals_to_report == NULL | |
3549 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3550 | { |
3551 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3552 | last_status.kind check above would catch it, and we wouldn't | |
3553 | reach here. This LWP may have been momentarily paused by a | |
3554 | stop_all_lwps call while handling for example, another LWP's | |
3555 | step-over. In that case, the pending expected SIGSTOP signal | |
3556 | that was queued at vCont;t handling time will have already | |
3557 | been consumed by wait_for_sigstop, and so we need to requeue | |
3558 | another one here. Note that if the LWP already has a SIGSTOP | |
3559 | pending, this is a no-op. */ | |
3560 | ||
3561 | if (debug_threads) | |
3562 | fprintf (stderr, | |
3563 | "Client wants LWP %ld to stop. " | |
3564 | "Making sure it has a SIGSTOP pending\n", | |
3565 | lwpid_of (lwp)); | |
3566 | ||
3567 | send_sigstop (lwp); | |
3568 | } | |
3569 | ||
8336d594 | 3570 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3571 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3572 | return 0; |
3573 | } | |
3574 | ||
3575 | static int | |
3576 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3577 | { | |
3578 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3579 | ||
3580 | if (lwp == except) | |
3581 | return 0; | |
3582 | ||
3583 | lwp->suspended--; | |
3584 | gdb_assert (lwp->suspended >= 0); | |
3585 | ||
3586 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3587 | } |
3588 | ||
3589 | /* When we finish a step-over, set threads running again. If there's | |
3590 | another thread that may need a step-over, now's the time to start | |
3591 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3592 | ||
3593 | static void | |
3594 | proceed_all_lwps (void) | |
3595 | { | |
3596 | struct lwp_info *need_step_over; | |
3597 | ||
3598 | /* If there is a thread which would otherwise be resumed, which is | |
3599 | stopped at a breakpoint that needs stepping over, then don't | |
3600 | resume any threads - have it step over the breakpoint with all | |
3601 | other threads stopped, then resume all threads again. */ | |
3602 | ||
3603 | if (supports_breakpoints ()) | |
3604 | { | |
3605 | need_step_over | |
3606 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3607 | need_step_over_p, NULL); | |
3608 | ||
3609 | if (need_step_over != NULL) | |
3610 | { | |
3611 | if (debug_threads) | |
3612 | fprintf (stderr, "proceed_all_lwps: found " | |
3613 | "thread %ld needing a step-over\n", | |
3614 | lwpid_of (need_step_over)); | |
3615 | ||
3616 | start_step_over (need_step_over); | |
3617 | return; | |
3618 | } | |
3619 | } | |
5544ad89 | 3620 | |
d50171e4 PA |
3621 | if (debug_threads) |
3622 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3623 | ||
7984d532 | 3624 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3625 | } |
3626 | ||
3627 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3628 | pending statuses, are set to run again, except for EXCEPT, if not | |
3629 | NULL. This undoes a stop_all_lwps call. */ | |
3630 | ||
3631 | static void | |
7984d532 | 3632 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3633 | { |
5544ad89 DJ |
3634 | if (debug_threads) |
3635 | { | |
d50171e4 PA |
3636 | if (except) |
3637 | fprintf (stderr, | |
3638 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3639 | else |
d50171e4 PA |
3640 | fprintf (stderr, |
3641 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3642 | } |
3643 | ||
7984d532 PA |
3644 | if (unsuspend) |
3645 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3646 | else | |
3647 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3648 | } |
3649 | ||
3650 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
3651 | |
3652 | int | |
0a30fbc4 | 3653 | register_addr (int regnum) |
da6d8c04 DJ |
3654 | { |
3655 | int addr; | |
3656 | ||
2ec06d2e | 3657 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
3658 | error ("Invalid register number %d.", regnum); |
3659 | ||
2ec06d2e | 3660 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
3661 | |
3662 | return addr; | |
3663 | } | |
3664 | ||
58caa3dc | 3665 | /* Fetch one register. */ |
da6d8c04 | 3666 | static void |
442ea881 | 3667 | fetch_register (struct regcache *regcache, int regno) |
da6d8c04 DJ |
3668 | { |
3669 | CORE_ADDR regaddr; | |
48d93c75 | 3670 | int i, size; |
0d62e5e8 | 3671 | char *buf; |
95954743 | 3672 | int pid; |
da6d8c04 | 3673 | |
2ec06d2e | 3674 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 3675 | return; |
2ec06d2e | 3676 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 3677 | return; |
da6d8c04 | 3678 | |
0a30fbc4 DJ |
3679 | regaddr = register_addr (regno); |
3680 | if (regaddr == -1) | |
3681 | return; | |
95954743 PA |
3682 | |
3683 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
3684 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
3685 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
3686 | buf = alloca (size); |
3687 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
3688 | { |
3689 | errno = 0; | |
0d62e5e8 | 3690 | *(PTRACE_XFER_TYPE *) (buf + i) = |
14ce3065 DE |
3691 | ptrace (PTRACE_PEEKUSER, pid, |
3692 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3693 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3694 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
da6d8c04 DJ |
3695 | regaddr += sizeof (PTRACE_XFER_TYPE); |
3696 | if (errno != 0) | |
f52cd8cd | 3697 | error ("reading register %d: %s", regno, strerror (errno)); |
da6d8c04 | 3698 | } |
ee1a7ae4 UW |
3699 | |
3700 | if (the_low_target.supply_ptrace_register) | |
442ea881 | 3701 | the_low_target.supply_ptrace_register (regcache, regno, buf); |
5a1f5858 | 3702 | else |
442ea881 | 3703 | supply_register (regcache, regno, buf); |
da6d8c04 DJ |
3704 | } |
3705 | ||
3706 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc | 3707 | static void |
442ea881 | 3708 | usr_fetch_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 3709 | { |
4463ce24 | 3710 | if (regno == -1) |
2ec06d2e | 3711 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 3712 | fetch_register (regcache, regno); |
da6d8c04 | 3713 | else |
442ea881 | 3714 | fetch_register (regcache, regno); |
da6d8c04 DJ |
3715 | } |
3716 | ||
3717 | /* Store our register values back into the inferior. | |
3718 | If REGNO is -1, do this for all registers. | |
3719 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc | 3720 | static void |
442ea881 | 3721 | usr_store_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 DJ |
3722 | { |
3723 | CORE_ADDR regaddr; | |
48d93c75 | 3724 | int i, size; |
0d62e5e8 | 3725 | char *buf; |
55ac2b99 | 3726 | int pid; |
da6d8c04 DJ |
3727 | |
3728 | if (regno >= 0) | |
3729 | { | |
2ec06d2e | 3730 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
3731 | return; |
3732 | ||
bc1e36ca | 3733 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
3734 | return; |
3735 | ||
3736 | regaddr = register_addr (regno); | |
3737 | if (regaddr == -1) | |
da6d8c04 | 3738 | return; |
da6d8c04 | 3739 | errno = 0; |
48d93c75 UW |
3740 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
3741 | & - sizeof (PTRACE_XFER_TYPE); | |
3742 | buf = alloca (size); | |
3743 | memset (buf, 0, size); | |
ee1a7ae4 UW |
3744 | |
3745 | if (the_low_target.collect_ptrace_register) | |
442ea881 | 3746 | the_low_target.collect_ptrace_register (regcache, regno, buf); |
5a1f5858 | 3747 | else |
442ea881 | 3748 | collect_register (regcache, regno, buf); |
ee1a7ae4 | 3749 | |
95954743 | 3750 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 3751 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 3752 | { |
0a30fbc4 | 3753 | errno = 0; |
14ce3065 DE |
3754 | ptrace (PTRACE_POKEUSER, pid, |
3755 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3756 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3757 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
3758 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
da6d8c04 DJ |
3759 | if (errno != 0) |
3760 | { | |
1b3f6016 PA |
3761 | /* At this point, ESRCH should mean the process is |
3762 | already gone, in which case we simply ignore attempts | |
3763 | to change its registers. See also the related | |
3764 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
3765 | if (errno == ESRCH) |
3766 | return; | |
3767 | ||
bc1e36ca | 3768 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
f52cd8cd | 3769 | error ("writing register %d: %s", regno, strerror (errno)); |
da6d8c04 | 3770 | } |
2ff29de4 | 3771 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 3772 | } |
da6d8c04 DJ |
3773 | } |
3774 | else | |
2ec06d2e | 3775 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 3776 | usr_store_inferior_registers (regcache, regno); |
da6d8c04 | 3777 | } |
58caa3dc DJ |
3778 | #endif /* HAVE_LINUX_USRREGS */ |
3779 | ||
3780 | ||
3781 | ||
3782 | #ifdef HAVE_LINUX_REGSETS | |
3783 | ||
3784 | static int | |
442ea881 | 3785 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3786 | { |
3787 | struct regset_info *regset; | |
e9d25b98 | 3788 | int saw_general_regs = 0; |
95954743 | 3789 | int pid; |
1570b33e | 3790 | struct iovec iov; |
58caa3dc DJ |
3791 | |
3792 | regset = target_regsets; | |
3793 | ||
95954743 | 3794 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3795 | while (regset->size >= 0) |
3796 | { | |
1570b33e L |
3797 | void *buf, *data; |
3798 | int nt_type, res; | |
58caa3dc | 3799 | |
52fa2412 | 3800 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3801 | { |
3802 | regset ++; | |
3803 | continue; | |
3804 | } | |
3805 | ||
bca929d3 | 3806 | buf = xmalloc (regset->size); |
1570b33e L |
3807 | |
3808 | nt_type = regset->nt_type; | |
3809 | if (nt_type) | |
3810 | { | |
3811 | iov.iov_base = buf; | |
3812 | iov.iov_len = regset->size; | |
3813 | data = (void *) &iov; | |
3814 | } | |
3815 | else | |
3816 | data = buf; | |
3817 | ||
dfb64f85 | 3818 | #ifndef __sparc__ |
1570b33e | 3819 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3820 | #else |
1570b33e | 3821 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 3822 | #endif |
58caa3dc DJ |
3823 | if (res < 0) |
3824 | { | |
3825 | if (errno == EIO) | |
3826 | { | |
52fa2412 UW |
3827 | /* If we get EIO on a regset, do not try it again for |
3828 | this process. */ | |
3829 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3830 | free (buf); |
52fa2412 | 3831 | continue; |
58caa3dc DJ |
3832 | } |
3833 | else | |
3834 | { | |
0d62e5e8 | 3835 | char s[256]; |
95954743 PA |
3836 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
3837 | pid); | |
0d62e5e8 | 3838 | perror (s); |
58caa3dc DJ |
3839 | } |
3840 | } | |
e9d25b98 DJ |
3841 | else if (regset->type == GENERAL_REGS) |
3842 | saw_general_regs = 1; | |
442ea881 | 3843 | regset->store_function (regcache, buf); |
58caa3dc | 3844 | regset ++; |
fdeb2a12 | 3845 | free (buf); |
58caa3dc | 3846 | } |
e9d25b98 DJ |
3847 | if (saw_general_regs) |
3848 | return 0; | |
3849 | else | |
3850 | return 1; | |
58caa3dc DJ |
3851 | } |
3852 | ||
3853 | static int | |
442ea881 | 3854 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3855 | { |
3856 | struct regset_info *regset; | |
e9d25b98 | 3857 | int saw_general_regs = 0; |
95954743 | 3858 | int pid; |
1570b33e | 3859 | struct iovec iov; |
58caa3dc DJ |
3860 | |
3861 | regset = target_regsets; | |
3862 | ||
95954743 | 3863 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3864 | while (regset->size >= 0) |
3865 | { | |
1570b33e L |
3866 | void *buf, *data; |
3867 | int nt_type, res; | |
58caa3dc | 3868 | |
52fa2412 | 3869 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3870 | { |
3871 | regset ++; | |
3872 | continue; | |
3873 | } | |
3874 | ||
bca929d3 | 3875 | buf = xmalloc (regset->size); |
545587ee DJ |
3876 | |
3877 | /* First fill the buffer with the current register set contents, | |
3878 | in case there are any items in the kernel's regset that are | |
3879 | not in gdbserver's regcache. */ | |
1570b33e L |
3880 | |
3881 | nt_type = regset->nt_type; | |
3882 | if (nt_type) | |
3883 | { | |
3884 | iov.iov_base = buf; | |
3885 | iov.iov_len = regset->size; | |
3886 | data = (void *) &iov; | |
3887 | } | |
3888 | else | |
3889 | data = buf; | |
3890 | ||
dfb64f85 | 3891 | #ifndef __sparc__ |
1570b33e | 3892 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3893 | #else |
1570b33e | 3894 | res = ptrace (regset->get_request, pid, &iov, data); |
dfb64f85 | 3895 | #endif |
545587ee DJ |
3896 | |
3897 | if (res == 0) | |
3898 | { | |
3899 | /* Then overlay our cached registers on that. */ | |
442ea881 | 3900 | regset->fill_function (regcache, buf); |
545587ee DJ |
3901 | |
3902 | /* Only now do we write the register set. */ | |
dfb64f85 | 3903 | #ifndef __sparc__ |
1570b33e | 3904 | res = ptrace (regset->set_request, pid, nt_type, data); |
dfb64f85 | 3905 | #else |
1570b33e | 3906 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 3907 | #endif |
545587ee DJ |
3908 | } |
3909 | ||
58caa3dc DJ |
3910 | if (res < 0) |
3911 | { | |
3912 | if (errno == EIO) | |
3913 | { | |
52fa2412 UW |
3914 | /* If we get EIO on a regset, do not try it again for |
3915 | this process. */ | |
3916 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3917 | free (buf); |
52fa2412 | 3918 | continue; |
58caa3dc | 3919 | } |
3221518c UW |
3920 | else if (errno == ESRCH) |
3921 | { | |
1b3f6016 PA |
3922 | /* At this point, ESRCH should mean the process is |
3923 | already gone, in which case we simply ignore attempts | |
3924 | to change its registers. See also the related | |
3925 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 3926 | free (buf); |
3221518c UW |
3927 | return 0; |
3928 | } | |
58caa3dc DJ |
3929 | else |
3930 | { | |
ce3a066d | 3931 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
3932 | } |
3933 | } | |
e9d25b98 DJ |
3934 | else if (regset->type == GENERAL_REGS) |
3935 | saw_general_regs = 1; | |
58caa3dc | 3936 | regset ++; |
09ec9b38 | 3937 | free (buf); |
58caa3dc | 3938 | } |
e9d25b98 DJ |
3939 | if (saw_general_regs) |
3940 | return 0; | |
3941 | else | |
3942 | return 1; | |
ce3a066d | 3943 | return 0; |
58caa3dc DJ |
3944 | } |
3945 | ||
3946 | #endif /* HAVE_LINUX_REGSETS */ | |
3947 | ||
3948 | ||
3949 | void | |
442ea881 | 3950 | linux_fetch_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3951 | { |
3952 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3953 | if (regsets_fetch_inferior_registers (regcache) == 0) |
52fa2412 | 3954 | return; |
58caa3dc DJ |
3955 | #endif |
3956 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3957 | usr_fetch_inferior_registers (regcache, regno); |
58caa3dc DJ |
3958 | #endif |
3959 | } | |
3960 | ||
3961 | void | |
442ea881 | 3962 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3963 | { |
3964 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3965 | if (regsets_store_inferior_registers (regcache) == 0) |
52fa2412 | 3966 | return; |
58caa3dc DJ |
3967 | #endif |
3968 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3969 | usr_store_inferior_registers (regcache, regno); |
58caa3dc DJ |
3970 | #endif |
3971 | } | |
3972 | ||
da6d8c04 | 3973 | |
da6d8c04 DJ |
3974 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
3975 | to debugger memory starting at MYADDR. */ | |
3976 | ||
c3e735a6 | 3977 | static int |
f450004a | 3978 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
3979 | { |
3980 | register int i; | |
3981 | /* Round starting address down to longword boundary. */ | |
3982 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
3983 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
3984 | register int count |
3985 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
3986 | / sizeof (PTRACE_XFER_TYPE); |
3987 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 3988 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 3989 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
3990 | int fd; |
3991 | char filename[64]; | |
95954743 | 3992 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
3993 | |
3994 | /* Try using /proc. Don't bother for one word. */ | |
3995 | if (len >= 3 * sizeof (long)) | |
3996 | { | |
3997 | /* We could keep this file open and cache it - possibly one per | |
3998 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 3999 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4000 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4001 | if (fd == -1) | |
4002 | goto no_proc; | |
4003 | ||
4004 | /* If pread64 is available, use it. It's faster if the kernel | |
4005 | supports it (only one syscall), and it's 64-bit safe even on | |
4006 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4007 | application). */ | |
4008 | #ifdef HAVE_PREAD64 | |
4009 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
4010 | #else | |
1de1badb | 4011 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
4012 | #endif |
4013 | { | |
4014 | close (fd); | |
4015 | goto no_proc; | |
4016 | } | |
4017 | ||
4018 | close (fd); | |
4019 | return 0; | |
4020 | } | |
da6d8c04 | 4021 | |
fd462a61 | 4022 | no_proc: |
da6d8c04 DJ |
4023 | /* Read all the longwords */ |
4024 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4025 | { | |
c3e735a6 | 4026 | errno = 0; |
14ce3065 DE |
4027 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4028 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4029 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
4030 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
4031 | if (errno) |
4032 | return errno; | |
da6d8c04 DJ |
4033 | } |
4034 | ||
4035 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
4036 | memcpy (myaddr, |
4037 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4038 | len); | |
c3e735a6 DJ |
4039 | |
4040 | return 0; | |
da6d8c04 DJ |
4041 | } |
4042 | ||
93ae6fdc PA |
4043 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4044 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
4045 | returns the value of errno. */ |
4046 | ||
ce3a066d | 4047 | static int |
f450004a | 4048 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4049 | { |
4050 | register int i; | |
4051 | /* Round starting address down to longword boundary. */ | |
4052 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4053 | /* Round ending address up; get number of longwords that makes. */ | |
4054 | register int count | |
493e2a69 MS |
4055 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4056 | / sizeof (PTRACE_XFER_TYPE); | |
4057 | ||
da6d8c04 | 4058 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4059 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4060 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4061 | ||
95954743 | 4062 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4063 | |
0d62e5e8 DJ |
4064 | if (debug_threads) |
4065 | { | |
58d6951d DJ |
4066 | /* Dump up to four bytes. */ |
4067 | unsigned int val = * (unsigned int *) myaddr; | |
4068 | if (len == 1) | |
4069 | val = val & 0xff; | |
4070 | else if (len == 2) | |
4071 | val = val & 0xffff; | |
4072 | else if (len == 3) | |
4073 | val = val & 0xffffff; | |
4074 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4075 | val, (long)memaddr); | |
0d62e5e8 DJ |
4076 | } |
4077 | ||
da6d8c04 DJ |
4078 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4079 | ||
93ae6fdc | 4080 | errno = 0; |
14ce3065 DE |
4081 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4082 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4083 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
4084 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
4085 | if (errno) |
4086 | return errno; | |
da6d8c04 DJ |
4087 | |
4088 | if (count > 1) | |
4089 | { | |
93ae6fdc | 4090 | errno = 0; |
da6d8c04 | 4091 | buffer[count - 1] |
95954743 | 4092 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4093 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4094 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4095 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4096 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 4097 | 0); |
93ae6fdc PA |
4098 | if (errno) |
4099 | return errno; | |
da6d8c04 DJ |
4100 | } |
4101 | ||
93ae6fdc | 4102 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4103 | |
493e2a69 MS |
4104 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4105 | myaddr, len); | |
da6d8c04 DJ |
4106 | |
4107 | /* Write the entire buffer. */ | |
4108 | ||
4109 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4110 | { | |
4111 | errno = 0; | |
14ce3065 DE |
4112 | ptrace (PTRACE_POKETEXT, pid, |
4113 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4114 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4115 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4116 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4117 | if (errno) |
4118 | return errno; | |
4119 | } | |
4120 | ||
4121 | return 0; | |
4122 | } | |
2f2893d9 | 4123 | |
6076632b | 4124 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4125 | static int linux_supports_tracefork_flag; |
4126 | ||
1e7fc18c PA |
4127 | static void |
4128 | linux_enable_event_reporting (int pid) | |
4129 | { | |
4130 | if (!linux_supports_tracefork_flag) | |
4131 | return; | |
4132 | ||
4133 | ptrace (PTRACE_SETOPTIONS, pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
4134 | } | |
4135 | ||
51c2684e | 4136 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4137 | |
51c2684e DJ |
4138 | static int |
4139 | linux_tracefork_grandchild (void *arg) | |
4140 | { | |
4141 | _exit (0); | |
4142 | } | |
4143 | ||
7407e2de AS |
4144 | #define STACK_SIZE 4096 |
4145 | ||
51c2684e DJ |
4146 | static int |
4147 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
4148 | { |
4149 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
4150 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
4151 | |
4152 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4153 | ||
4154 | if (fork () == 0) | |
4155 | linux_tracefork_grandchild (NULL); | |
4156 | ||
4157 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4158 | ||
7407e2de AS |
4159 | #ifdef __ia64__ |
4160 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4161 | CLONE_VM | SIGCHLD, NULL); | |
4162 | #else | |
a1f2ce7d | 4163 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4164 | CLONE_VM | SIGCHLD, NULL); |
4165 | #endif | |
e4b7f41c JK |
4166 | |
4167 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4168 | ||
24a09b5f DJ |
4169 | _exit (0); |
4170 | } | |
4171 | ||
24a09b5f DJ |
4172 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4173 | sure that we can enable the option, and that it had the desired | |
4174 | effect. */ | |
4175 | ||
4176 | static void | |
4177 | linux_test_for_tracefork (void) | |
4178 | { | |
4179 | int child_pid, ret, status; | |
4180 | long second_pid; | |
e4b7f41c | 4181 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4182 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4183 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4184 | |
4185 | linux_supports_tracefork_flag = 0; | |
4186 | ||
e4b7f41c JK |
4187 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4188 | ||
4189 | child_pid = fork (); | |
4190 | if (child_pid == 0) | |
4191 | linux_tracefork_child (NULL); | |
4192 | ||
4193 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4194 | ||
51c2684e | 4195 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4196 | #ifdef __ia64__ |
4197 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4198 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4199 | #else /* !__ia64__ */ |
7407e2de AS |
4200 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4201 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4202 | #endif /* !__ia64__ */ |
4203 | ||
4204 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4205 | ||
24a09b5f | 4206 | if (child_pid == -1) |
51c2684e | 4207 | perror_with_name ("clone"); |
24a09b5f DJ |
4208 | |
4209 | ret = my_waitpid (child_pid, &status, 0); | |
4210 | if (ret == -1) | |
4211 | perror_with_name ("waitpid"); | |
4212 | else if (ret != child_pid) | |
4213 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4214 | if (! WIFSTOPPED (status)) | |
4215 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4216 | ||
14ce3065 DE |
4217 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
4218 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
4219 | if (ret != 0) |
4220 | { | |
4221 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4222 | if (ret != 0) | |
4223 | { | |
4224 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4225 | return; | |
4226 | } | |
4227 | ||
4228 | ret = my_waitpid (child_pid, &status, 0); | |
4229 | if (ret != child_pid) | |
4230 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4231 | else if (!WIFSIGNALED (status)) | |
4232 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4233 | "killed child", status); | |
4234 | ||
4235 | return; | |
4236 | } | |
4237 | ||
4238 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
4239 | if (ret != 0) | |
4240 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4241 | ||
4242 | ret = my_waitpid (child_pid, &status, 0); | |
4243 | ||
4244 | if (ret == child_pid && WIFSTOPPED (status) | |
4245 | && status >> 16 == PTRACE_EVENT_FORK) | |
4246 | { | |
4247 | second_pid = 0; | |
4248 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
4249 | if (ret == 0 && second_pid != 0) | |
4250 | { | |
4251 | int second_status; | |
4252 | ||
4253 | linux_supports_tracefork_flag = 1; | |
4254 | my_waitpid (second_pid, &second_status, 0); | |
4255 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
4256 | if (ret != 0) | |
4257 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4258 | my_waitpid (second_pid, &status, 0); | |
4259 | } | |
4260 | } | |
4261 | else | |
4262 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4263 | "(%d, status 0x%x)", ret, status); | |
4264 | ||
4265 | do | |
4266 | { | |
4267 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4268 | if (ret != 0) | |
4269 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4270 | my_waitpid (child_pid, &status, 0); | |
4271 | } | |
4272 | while (WIFSTOPPED (status)); | |
51c2684e | 4273 | |
e4b7f41c | 4274 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4275 | free (stack); |
e4b7f41c | 4276 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4277 | } |
4278 | ||
4279 | ||
2f2893d9 DJ |
4280 | static void |
4281 | linux_look_up_symbols (void) | |
4282 | { | |
0d62e5e8 | 4283 | #ifdef USE_THREAD_DB |
95954743 PA |
4284 | struct process_info *proc = current_process (); |
4285 | ||
cdbfd419 | 4286 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4287 | return; |
4288 | ||
6076632b DE |
4289 | /* If the kernel supports tracing forks then it also supports tracing |
4290 | clones, and then we don't need to use the magic thread event breakpoint | |
4291 | to learn about threads. */ | |
cdbfd419 | 4292 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4293 | #endif |
4294 | } | |
4295 | ||
e5379b03 | 4296 | static void |
ef57601b | 4297 | linux_request_interrupt (void) |
e5379b03 | 4298 | { |
a1928bad | 4299 | extern unsigned long signal_pid; |
e5379b03 | 4300 | |
95954743 PA |
4301 | if (!ptid_equal (cont_thread, null_ptid) |
4302 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4303 | { |
54a0b537 | 4304 | struct lwp_info *lwp; |
bd99dc85 | 4305 | int lwpid; |
e5379b03 | 4306 | |
54a0b537 | 4307 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4308 | lwpid = lwpid_of (lwp); |
4309 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4310 | } |
4311 | else | |
ef57601b | 4312 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4313 | } |
4314 | ||
aa691b87 RM |
4315 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4316 | to debugger memory starting at MYADDR. */ | |
4317 | ||
4318 | static int | |
f450004a | 4319 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4320 | { |
4321 | char filename[PATH_MAX]; | |
4322 | int fd, n; | |
95954743 | 4323 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4324 | |
6cebaf6e | 4325 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4326 | |
4327 | fd = open (filename, O_RDONLY); | |
4328 | if (fd < 0) | |
4329 | return -1; | |
4330 | ||
4331 | if (offset != (CORE_ADDR) 0 | |
4332 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4333 | n = -1; | |
4334 | else | |
4335 | n = read (fd, myaddr, len); | |
4336 | ||
4337 | close (fd); | |
4338 | ||
4339 | return n; | |
4340 | } | |
4341 | ||
d993e290 PA |
4342 | /* These breakpoint and watchpoint related wrapper functions simply |
4343 | pass on the function call if the target has registered a | |
4344 | corresponding function. */ | |
e013ee27 OF |
4345 | |
4346 | static int | |
d993e290 | 4347 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4348 | { |
d993e290 PA |
4349 | if (the_low_target.insert_point != NULL) |
4350 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4351 | else |
4352 | /* Unsupported (see target.h). */ | |
4353 | return 1; | |
4354 | } | |
4355 | ||
4356 | static int | |
d993e290 | 4357 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4358 | { |
d993e290 PA |
4359 | if (the_low_target.remove_point != NULL) |
4360 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4361 | else |
4362 | /* Unsupported (see target.h). */ | |
4363 | return 1; | |
4364 | } | |
4365 | ||
4366 | static int | |
4367 | linux_stopped_by_watchpoint (void) | |
4368 | { | |
c3adc08c PA |
4369 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4370 | ||
4371 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4372 | } |
4373 | ||
4374 | static CORE_ADDR | |
4375 | linux_stopped_data_address (void) | |
4376 | { | |
c3adc08c PA |
4377 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4378 | ||
4379 | return lwp->stopped_data_address; | |
e013ee27 OF |
4380 | } |
4381 | ||
42c81e2a | 4382 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
4383 | #if defined(__mcoldfire__) |
4384 | /* These should really be defined in the kernel's ptrace.h header. */ | |
4385 | #define PT_TEXT_ADDR 49*4 | |
4386 | #define PT_DATA_ADDR 50*4 | |
4387 | #define PT_TEXT_END_ADDR 51*4 | |
eb826dc6 MF |
4388 | #elif defined(BFIN) |
4389 | #define PT_TEXT_ADDR 220 | |
4390 | #define PT_TEXT_END_ADDR 224 | |
4391 | #define PT_DATA_ADDR 228 | |
52fb6437 NS |
4392 | #endif |
4393 | ||
4394 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4395 | to tell gdb about. */ | |
4396 | ||
4397 | static int | |
4398 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4399 | { | |
4400 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
4401 | unsigned long text, text_end, data; | |
bd99dc85 | 4402 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4403 | |
4404 | errno = 0; | |
4405 | ||
4406 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
4407 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
4408 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
4409 | ||
4410 | if (errno == 0) | |
4411 | { | |
4412 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4413 | used by gdb) are relative to the beginning of the program, |
4414 | with the data segment immediately following the text segment. | |
4415 | However, the actual runtime layout in memory may put the data | |
4416 | somewhere else, so when we send gdb a data base-address, we | |
4417 | use the real data base address and subtract the compile-time | |
4418 | data base-address from it (which is just the length of the | |
4419 | text segment). BSS immediately follows data in both | |
4420 | cases. */ | |
52fb6437 NS |
4421 | *text_p = text; |
4422 | *data_p = data - (text_end - text); | |
1b3f6016 | 4423 | |
52fb6437 NS |
4424 | return 1; |
4425 | } | |
4426 | #endif | |
4427 | return 0; | |
4428 | } | |
4429 | #endif | |
4430 | ||
dc146f7c VP |
4431 | static int |
4432 | compare_ints (const void *xa, const void *xb) | |
4433 | { | |
4434 | int a = *(const int *)xa; | |
4435 | int b = *(const int *)xb; | |
4436 | ||
4437 | return a - b; | |
4438 | } | |
4439 | ||
4440 | static int * | |
4441 | unique (int *b, int *e) | |
4442 | { | |
4443 | int *d = b; | |
4444 | while (++b != e) | |
4445 | if (*d != *b) | |
4446 | *++d = *b; | |
4447 | return ++d; | |
4448 | } | |
4449 | ||
4450 | /* Given PID, iterates over all threads in that process. | |
4451 | ||
4452 | Information about each thread, in a format suitable for qXfer:osdata:thread | |
4453 | is printed to BUFFER, if it's not NULL. BUFFER is assumed to be already | |
4454 | initialized, and the caller is responsible for finishing and appending '\0' | |
4455 | to it. | |
4456 | ||
4457 | The list of cores that threads are running on is assigned to *CORES, if it | |
4458 | is not NULL. If no cores are found, *CORES will be set to NULL. Caller | |
4459 | should free *CORES. */ | |
4460 | ||
4461 | static void | |
4462 | list_threads (int pid, struct buffer *buffer, char **cores) | |
4463 | { | |
4464 | int count = 0; | |
4465 | int allocated = 10; | |
4466 | int *core_numbers = xmalloc (sizeof (int) * allocated); | |
4467 | char pathname[128]; | |
4468 | DIR *dir; | |
4469 | struct dirent *dp; | |
4470 | struct stat statbuf; | |
4471 | ||
4472 | sprintf (pathname, "/proc/%d/task", pid); | |
4473 | if (stat (pathname, &statbuf) == 0 && S_ISDIR (statbuf.st_mode)) | |
4474 | { | |
4475 | dir = opendir (pathname); | |
4476 | if (!dir) | |
4477 | { | |
4478 | free (core_numbers); | |
4479 | return; | |
4480 | } | |
4481 | ||
4482 | while ((dp = readdir (dir)) != NULL) | |
4483 | { | |
4484 | unsigned long lwp = strtoul (dp->d_name, NULL, 10); | |
4485 | ||
4486 | if (lwp != 0) | |
4487 | { | |
4488 | unsigned core = linux_core_of_thread (ptid_build (pid, lwp, 0)); | |
4489 | ||
4490 | if (core != -1) | |
4491 | { | |
4492 | char s[sizeof ("4294967295")]; | |
4493 | sprintf (s, "%u", core); | |
4494 | ||
4495 | if (count == allocated) | |
4496 | { | |
4497 | allocated *= 2; | |
4498 | core_numbers = realloc (core_numbers, | |
4499 | sizeof (int) * allocated); | |
4500 | } | |
4501 | core_numbers[count++] = core; | |
4502 | if (buffer) | |
4503 | buffer_xml_printf (buffer, | |
4504 | "<item>" | |
4505 | "<column name=\"pid\">%d</column>" | |
4506 | "<column name=\"tid\">%s</column>" | |
4507 | "<column name=\"core\">%s</column>" | |
4508 | "</item>", pid, dp->d_name, s); | |
4509 | } | |
4510 | else | |
4511 | { | |
4512 | if (buffer) | |
4513 | buffer_xml_printf (buffer, | |
4514 | "<item>" | |
4515 | "<column name=\"pid\">%d</column>" | |
4516 | "<column name=\"tid\">%s</column>" | |
4517 | "</item>", pid, dp->d_name); | |
4518 | } | |
4519 | } | |
4520 | } | |
69d37113 | 4521 | closedir (dir); |
dc146f7c VP |
4522 | } |
4523 | ||
4524 | if (cores) | |
4525 | { | |
4526 | *cores = NULL; | |
4527 | if (count > 0) | |
4528 | { | |
4529 | struct buffer buffer2; | |
4530 | int *b; | |
4531 | int *e; | |
4532 | qsort (core_numbers, count, sizeof (int), compare_ints); | |
4533 | ||
4534 | /* Remove duplicates. */ | |
4535 | b = core_numbers; | |
4536 | e = unique (b, core_numbers + count); | |
4537 | ||
4538 | buffer_init (&buffer2); | |
4539 | ||
4540 | for (b = core_numbers; b != e; ++b) | |
4541 | { | |
4542 | char number[sizeof ("4294967295")]; | |
4543 | sprintf (number, "%u", *b); | |
4544 | buffer_xml_printf (&buffer2, "%s%s", | |
4545 | (b == core_numbers) ? "" : ",", number); | |
4546 | } | |
4547 | buffer_grow_str0 (&buffer2, ""); | |
4548 | ||
4549 | *cores = buffer_finish (&buffer2); | |
4550 | } | |
4551 | } | |
4552 | free (core_numbers); | |
4553 | } | |
4554 | ||
4555 | static void | |
4556 | show_process (int pid, const char *username, struct buffer *buffer) | |
4557 | { | |
4558 | char pathname[128]; | |
4559 | FILE *f; | |
4560 | char cmd[MAXPATHLEN + 1]; | |
4561 | ||
4562 | sprintf (pathname, "/proc/%d/cmdline", pid); | |
4563 | ||
4564 | if ((f = fopen (pathname, "r")) != NULL) | |
4565 | { | |
4566 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
4567 | if (len > 0) | |
4568 | { | |
4569 | char *cores = 0; | |
4570 | int i; | |
4571 | for (i = 0; i < len; i++) | |
4572 | if (cmd[i] == '\0') | |
4573 | cmd[i] = ' '; | |
4574 | cmd[len] = '\0'; | |
4575 | ||
4576 | buffer_xml_printf (buffer, | |
4577 | "<item>" | |
4578 | "<column name=\"pid\">%d</column>" | |
4579 | "<column name=\"user\">%s</column>" | |
4580 | "<column name=\"command\">%s</column>", | |
4581 | pid, | |
4582 | username, | |
4583 | cmd); | |
4584 | ||
4585 | /* This only collects core numbers, and does not print threads. */ | |
4586 | list_threads (pid, NULL, &cores); | |
4587 | ||
4588 | if (cores) | |
4589 | { | |
4590 | buffer_xml_printf (buffer, | |
4591 | "<column name=\"cores\">%s</column>", cores); | |
4592 | free (cores); | |
4593 | } | |
4594 | ||
4595 | buffer_xml_printf (buffer, "</item>"); | |
4596 | } | |
4597 | fclose (f); | |
4598 | } | |
4599 | } | |
4600 | ||
07e059b5 VP |
4601 | static int |
4602 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4603 | unsigned char *readbuf, unsigned const char *writebuf, |
4604 | CORE_ADDR offset, int len) | |
07e059b5 VP |
4605 | { |
4606 | /* We make the process list snapshot when the object starts to be | |
4607 | read. */ | |
4608 | static const char *buf; | |
4609 | static long len_avail = -1; | |
4610 | static struct buffer buffer; | |
dc146f7c VP |
4611 | int processes = 0; |
4612 | int threads = 0; | |
07e059b5 VP |
4613 | |
4614 | DIR *dirp; | |
4615 | ||
dc146f7c VP |
4616 | if (strcmp (annex, "processes") == 0) |
4617 | processes = 1; | |
4618 | else if (strcmp (annex, "threads") == 0) | |
4619 | threads = 1; | |
4620 | else | |
07e059b5 VP |
4621 | return 0; |
4622 | ||
4623 | if (!readbuf || writebuf) | |
4624 | return 0; | |
4625 | ||
4626 | if (offset == 0) | |
4627 | { | |
4628 | if (len_avail != -1 && len_avail != 0) | |
4629 | buffer_free (&buffer); | |
4630 | len_avail = 0; | |
4631 | buf = NULL; | |
4632 | buffer_init (&buffer); | |
dc146f7c VP |
4633 | if (processes) |
4634 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
4635 | else if (threads) | |
4636 | buffer_grow_str (&buffer, "<osdata type=\"threads\">"); | |
07e059b5 VP |
4637 | |
4638 | dirp = opendir ("/proc"); | |
4639 | if (dirp) | |
4640 | { | |
1b3f6016 PA |
4641 | struct dirent *dp; |
4642 | while ((dp = readdir (dirp)) != NULL) | |
4643 | { | |
4644 | struct stat statbuf; | |
4645 | char procentry[sizeof ("/proc/4294967295")]; | |
4646 | ||
4647 | if (!isdigit (dp->d_name[0]) | |
4648 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
4649 | continue; | |
4650 | ||
4651 | sprintf (procentry, "/proc/%s", dp->d_name); | |
4652 | if (stat (procentry, &statbuf) == 0 | |
4653 | && S_ISDIR (statbuf.st_mode)) | |
4654 | { | |
dc146f7c | 4655 | int pid = (int) strtoul (dp->d_name, NULL, 10); |
1b3f6016 | 4656 | |
dc146f7c | 4657 | if (processes) |
1b3f6016 | 4658 | { |
dc146f7c VP |
4659 | struct passwd *entry = getpwuid (statbuf.st_uid); |
4660 | show_process (pid, entry ? entry->pw_name : "?", &buffer); | |
4661 | } | |
4662 | else if (threads) | |
4663 | { | |
4664 | list_threads (pid, &buffer, NULL); | |
1b3f6016 PA |
4665 | } |
4666 | } | |
4667 | } | |
07e059b5 | 4668 | |
1b3f6016 | 4669 | closedir (dirp); |
07e059b5 VP |
4670 | } |
4671 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
4672 | buf = buffer_finish (&buffer); | |
4673 | len_avail = strlen (buf); | |
4674 | } | |
4675 | ||
4676 | if (offset >= len_avail) | |
4677 | { | |
4678 | /* Done. Get rid of the data. */ | |
4679 | buffer_free (&buffer); | |
4680 | buf = NULL; | |
4681 | len_avail = 0; | |
4682 | return 0; | |
4683 | } | |
4684 | ||
4685 | if (len > len_avail - offset) | |
4686 | len = len_avail - offset; | |
4687 | memcpy (readbuf, buf + offset, len); | |
4688 | ||
4689 | return len; | |
4690 | } | |
4691 | ||
d0722149 DE |
4692 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4693 | layout of the inferiors' architecture. */ | |
4694 | ||
4695 | static void | |
4696 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
4697 | { | |
4698 | int done = 0; | |
4699 | ||
4700 | if (the_low_target.siginfo_fixup != NULL) | |
4701 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4702 | ||
4703 | /* If there was no callback, or the callback didn't do anything, | |
4704 | then just do a straight memcpy. */ | |
4705 | if (!done) | |
4706 | { | |
4707 | if (direction == 1) | |
4708 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4709 | else | |
4710 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4711 | } | |
4712 | } | |
4713 | ||
4aa995e1 PA |
4714 | static int |
4715 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4716 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4717 | { | |
d0722149 | 4718 | int pid; |
4aa995e1 | 4719 | struct siginfo siginfo; |
d0722149 | 4720 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4721 | |
4722 | if (current_inferior == NULL) | |
4723 | return -1; | |
4724 | ||
bd99dc85 | 4725 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4726 | |
4727 | if (debug_threads) | |
d0722149 | 4728 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4729 | readbuf != NULL ? "Reading" : "Writing", |
4730 | pid); | |
4731 | ||
0adea5f7 | 4732 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4733 | return -1; |
4734 | ||
4735 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
4736 | return -1; | |
4737 | ||
d0722149 DE |
4738 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4739 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4740 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4741 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4742 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4743 | ||
4aa995e1 PA |
4744 | if (offset + len > sizeof (siginfo)) |
4745 | len = sizeof (siginfo) - offset; | |
4746 | ||
4747 | if (readbuf != NULL) | |
d0722149 | 4748 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4749 | else |
4750 | { | |
d0722149 DE |
4751 | memcpy (inf_siginfo + offset, writebuf, len); |
4752 | ||
4753 | /* Convert back to ptrace layout before flushing it out. */ | |
4754 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4755 | ||
4aa995e1 PA |
4756 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
4757 | return -1; | |
4758 | } | |
4759 | ||
4760 | return len; | |
4761 | } | |
4762 | ||
bd99dc85 PA |
4763 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4764 | so we notice when children change state; as the handler for the | |
4765 | sigsuspend in my_waitpid. */ | |
4766 | ||
4767 | static void | |
4768 | sigchld_handler (int signo) | |
4769 | { | |
4770 | int old_errno = errno; | |
4771 | ||
4772 | if (debug_threads) | |
e581f2b4 PA |
4773 | { |
4774 | do | |
4775 | { | |
4776 | /* fprintf is not async-signal-safe, so call write | |
4777 | directly. */ | |
4778 | if (write (2, "sigchld_handler\n", | |
4779 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4780 | break; /* just ignore */ | |
4781 | } while (0); | |
4782 | } | |
bd99dc85 PA |
4783 | |
4784 | if (target_is_async_p ()) | |
4785 | async_file_mark (); /* trigger a linux_wait */ | |
4786 | ||
4787 | errno = old_errno; | |
4788 | } | |
4789 | ||
4790 | static int | |
4791 | linux_supports_non_stop (void) | |
4792 | { | |
4793 | return 1; | |
4794 | } | |
4795 | ||
4796 | static int | |
4797 | linux_async (int enable) | |
4798 | { | |
4799 | int previous = (linux_event_pipe[0] != -1); | |
4800 | ||
8336d594 PA |
4801 | if (debug_threads) |
4802 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4803 | enable, previous); | |
4804 | ||
bd99dc85 PA |
4805 | if (previous != enable) |
4806 | { | |
4807 | sigset_t mask; | |
4808 | sigemptyset (&mask); | |
4809 | sigaddset (&mask, SIGCHLD); | |
4810 | ||
4811 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4812 | ||
4813 | if (enable) | |
4814 | { | |
4815 | if (pipe (linux_event_pipe) == -1) | |
4816 | fatal ("creating event pipe failed."); | |
4817 | ||
4818 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4819 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4820 | ||
4821 | /* Register the event loop handler. */ | |
4822 | add_file_handler (linux_event_pipe[0], | |
4823 | handle_target_event, NULL); | |
4824 | ||
4825 | /* Always trigger a linux_wait. */ | |
4826 | async_file_mark (); | |
4827 | } | |
4828 | else | |
4829 | { | |
4830 | delete_file_handler (linux_event_pipe[0]); | |
4831 | ||
4832 | close (linux_event_pipe[0]); | |
4833 | close (linux_event_pipe[1]); | |
4834 | linux_event_pipe[0] = -1; | |
4835 | linux_event_pipe[1] = -1; | |
4836 | } | |
4837 | ||
4838 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4839 | } | |
4840 | ||
4841 | return previous; | |
4842 | } | |
4843 | ||
4844 | static int | |
4845 | linux_start_non_stop (int nonstop) | |
4846 | { | |
4847 | /* Register or unregister from event-loop accordingly. */ | |
4848 | linux_async (nonstop); | |
4849 | return 0; | |
4850 | } | |
4851 | ||
cf8fd78b PA |
4852 | static int |
4853 | linux_supports_multi_process (void) | |
4854 | { | |
4855 | return 1; | |
4856 | } | |
4857 | ||
efcbbd14 UW |
4858 | |
4859 | /* Enumerate spufs IDs for process PID. */ | |
4860 | static int | |
4861 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
4862 | { | |
4863 | int pos = 0; | |
4864 | int written = 0; | |
4865 | char path[128]; | |
4866 | DIR *dir; | |
4867 | struct dirent *entry; | |
4868 | ||
4869 | sprintf (path, "/proc/%ld/fd", pid); | |
4870 | dir = opendir (path); | |
4871 | if (!dir) | |
4872 | return -1; | |
4873 | ||
4874 | rewinddir (dir); | |
4875 | while ((entry = readdir (dir)) != NULL) | |
4876 | { | |
4877 | struct stat st; | |
4878 | struct statfs stfs; | |
4879 | int fd; | |
4880 | ||
4881 | fd = atoi (entry->d_name); | |
4882 | if (!fd) | |
4883 | continue; | |
4884 | ||
4885 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4886 | if (stat (path, &st) != 0) | |
4887 | continue; | |
4888 | if (!S_ISDIR (st.st_mode)) | |
4889 | continue; | |
4890 | ||
4891 | if (statfs (path, &stfs) != 0) | |
4892 | continue; | |
4893 | if (stfs.f_type != SPUFS_MAGIC) | |
4894 | continue; | |
4895 | ||
4896 | if (pos >= offset && pos + 4 <= offset + len) | |
4897 | { | |
4898 | *(unsigned int *)(buf + pos - offset) = fd; | |
4899 | written += 4; | |
4900 | } | |
4901 | pos += 4; | |
4902 | } | |
4903 | ||
4904 | closedir (dir); | |
4905 | return written; | |
4906 | } | |
4907 | ||
4908 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4909 | object type, using the /proc file system. */ | |
4910 | static int | |
4911 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4912 | unsigned const char *writebuf, | |
4913 | CORE_ADDR offset, int len) | |
4914 | { | |
4915 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4916 | char buf[128]; | |
4917 | int fd = 0; | |
4918 | int ret = 0; | |
4919 | ||
4920 | if (!writebuf && !readbuf) | |
4921 | return -1; | |
4922 | ||
4923 | if (!*annex) | |
4924 | { | |
4925 | if (!readbuf) | |
4926 | return -1; | |
4927 | else | |
4928 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4929 | } | |
4930 | ||
4931 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
4932 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4933 | if (fd <= 0) | |
4934 | return -1; | |
4935 | ||
4936 | if (offset != 0 | |
4937 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4938 | { | |
4939 | close (fd); | |
4940 | return 0; | |
4941 | } | |
4942 | ||
4943 | if (writebuf) | |
4944 | ret = write (fd, writebuf, (size_t) len); | |
4945 | else | |
4946 | ret = read (fd, readbuf, (size_t) len); | |
4947 | ||
4948 | close (fd); | |
4949 | return ret; | |
4950 | } | |
4951 | ||
dc146f7c VP |
4952 | static int |
4953 | linux_core_of_thread (ptid_t ptid) | |
4954 | { | |
4955 | char filename[sizeof ("/proc//task//stat") | |
4956 | + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */ | |
4957 | + 1]; | |
4958 | FILE *f; | |
4959 | char *content = NULL; | |
4960 | char *p; | |
4961 | char *ts = 0; | |
4962 | int content_read = 0; | |
4963 | int i; | |
4964 | int core; | |
4965 | ||
4966 | sprintf (filename, "/proc/%d/task/%ld/stat", | |
4967 | ptid_get_pid (ptid), ptid_get_lwp (ptid)); | |
4968 | f = fopen (filename, "r"); | |
4969 | if (!f) | |
4970 | return -1; | |
4971 | ||
4972 | for (;;) | |
4973 | { | |
4974 | int n; | |
4975 | content = realloc (content, content_read + 1024); | |
4976 | n = fread (content + content_read, 1, 1024, f); | |
4977 | content_read += n; | |
4978 | if (n < 1024) | |
4979 | { | |
4980 | content[content_read] = '\0'; | |
4981 | break; | |
4982 | } | |
4983 | } | |
4984 | ||
4985 | p = strchr (content, '('); | |
dc146f7c | 4986 | |
ca2a87a0 JK |
4987 | /* Skip ")". */ |
4988 | if (p != NULL) | |
4989 | p = strchr (p, ')'); | |
4990 | if (p != NULL) | |
4991 | p++; | |
4992 | ||
4993 | /* If the first field after program name has index 0, then core number is | |
4994 | the field with index 36. There's no constant for that anywhere. */ | |
4995 | if (p != NULL) | |
4996 | p = strtok_r (p, " ", &ts); | |
4997 | for (i = 0; p != NULL && i != 36; ++i) | |
dc146f7c VP |
4998 | p = strtok_r (NULL, " ", &ts); |
4999 | ||
ca2a87a0 | 5000 | if (p == NULL || sscanf (p, "%d", &core) == 0) |
dc146f7c VP |
5001 | core = -1; |
5002 | ||
5003 | free (content); | |
5004 | fclose (f); | |
5005 | ||
5006 | return core; | |
5007 | } | |
5008 | ||
1570b33e L |
5009 | static void |
5010 | linux_process_qsupported (const char *query) | |
5011 | { | |
5012 | if (the_low_target.process_qsupported != NULL) | |
5013 | the_low_target.process_qsupported (query); | |
5014 | } | |
5015 | ||
219f2f23 PA |
5016 | static int |
5017 | linux_supports_tracepoints (void) | |
5018 | { | |
5019 | if (*the_low_target.supports_tracepoints == NULL) | |
5020 | return 0; | |
5021 | ||
5022 | return (*the_low_target.supports_tracepoints) (); | |
5023 | } | |
5024 | ||
5025 | static CORE_ADDR | |
5026 | linux_read_pc (struct regcache *regcache) | |
5027 | { | |
5028 | if (the_low_target.get_pc == NULL) | |
5029 | return 0; | |
5030 | ||
5031 | return (*the_low_target.get_pc) (regcache); | |
5032 | } | |
5033 | ||
5034 | static void | |
5035 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5036 | { | |
5037 | gdb_assert (the_low_target.set_pc != NULL); | |
5038 | ||
5039 | (*the_low_target.set_pc) (regcache, pc); | |
5040 | } | |
5041 | ||
8336d594 PA |
5042 | static int |
5043 | linux_thread_stopped (struct thread_info *thread) | |
5044 | { | |
5045 | return get_thread_lwp (thread)->stopped; | |
5046 | } | |
5047 | ||
5048 | /* This exposes stop-all-threads functionality to other modules. */ | |
5049 | ||
5050 | static void | |
7984d532 | 5051 | linux_pause_all (int freeze) |
8336d594 | 5052 | { |
7984d532 PA |
5053 | stop_all_lwps (freeze, NULL); |
5054 | } | |
5055 | ||
5056 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5057 | modules. */ | |
5058 | ||
5059 | static void | |
5060 | linux_unpause_all (int unfreeze) | |
5061 | { | |
5062 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5063 | } |
5064 | ||
90d74c30 PA |
5065 | static int |
5066 | linux_prepare_to_access_memory (void) | |
5067 | { | |
5068 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5069 | running LWP. */ | |
5070 | if (non_stop) | |
5071 | linux_pause_all (1); | |
5072 | return 0; | |
5073 | } | |
5074 | ||
5075 | static void | |
0146f85b | 5076 | linux_done_accessing_memory (void) |
90d74c30 PA |
5077 | { |
5078 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5079 | running LWP. */ | |
5080 | if (non_stop) | |
5081 | linux_unpause_all (1); | |
5082 | } | |
5083 | ||
fa593d66 PA |
5084 | static int |
5085 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5086 | CORE_ADDR collector, | |
5087 | CORE_ADDR lockaddr, | |
5088 | ULONGEST orig_size, | |
5089 | CORE_ADDR *jump_entry, | |
5090 | unsigned char *jjump_pad_insn, | |
5091 | ULONGEST *jjump_pad_insn_size, | |
5092 | CORE_ADDR *adjusted_insn_addr, | |
5093 | CORE_ADDR *adjusted_insn_addr_end) | |
5094 | { | |
5095 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5096 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
5097 | jump_entry, jjump_pad_insn, jjump_pad_insn_size, | |
5098 | adjusted_insn_addr, adjusted_insn_addr_end); | |
5099 | } | |
5100 | ||
6a271cae PA |
5101 | static struct emit_ops * |
5102 | linux_emit_ops (void) | |
5103 | { | |
5104 | if (the_low_target.emit_ops != NULL) | |
5105 | return (*the_low_target.emit_ops) (); | |
5106 | else | |
5107 | return NULL; | |
5108 | } | |
5109 | ||
ce3a066d DJ |
5110 | static struct target_ops linux_target_ops = { |
5111 | linux_create_inferior, | |
5112 | linux_attach, | |
5113 | linux_kill, | |
6ad8ae5c | 5114 | linux_detach, |
8336d594 | 5115 | linux_mourn, |
444d6139 | 5116 | linux_join, |
ce3a066d DJ |
5117 | linux_thread_alive, |
5118 | linux_resume, | |
5119 | linux_wait, | |
5120 | linux_fetch_registers, | |
5121 | linux_store_registers, | |
90d74c30 | 5122 | linux_prepare_to_access_memory, |
0146f85b | 5123 | linux_done_accessing_memory, |
ce3a066d DJ |
5124 | linux_read_memory, |
5125 | linux_write_memory, | |
2f2893d9 | 5126 | linux_look_up_symbols, |
ef57601b | 5127 | linux_request_interrupt, |
aa691b87 | 5128 | linux_read_auxv, |
d993e290 PA |
5129 | linux_insert_point, |
5130 | linux_remove_point, | |
e013ee27 OF |
5131 | linux_stopped_by_watchpoint, |
5132 | linux_stopped_data_address, | |
42c81e2a | 5133 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 5134 | linux_read_offsets, |
dae5f5cf DJ |
5135 | #else |
5136 | NULL, | |
5137 | #endif | |
5138 | #ifdef USE_THREAD_DB | |
5139 | thread_db_get_tls_address, | |
5140 | #else | |
5141 | NULL, | |
52fb6437 | 5142 | #endif |
efcbbd14 | 5143 | linux_qxfer_spu, |
59a016f0 | 5144 | hostio_last_error_from_errno, |
07e059b5 | 5145 | linux_qxfer_osdata, |
4aa995e1 | 5146 | linux_xfer_siginfo, |
bd99dc85 PA |
5147 | linux_supports_non_stop, |
5148 | linux_async, | |
5149 | linux_start_non_stop, | |
cdbfd419 PP |
5150 | linux_supports_multi_process, |
5151 | #ifdef USE_THREAD_DB | |
dc146f7c | 5152 | thread_db_handle_monitor_command, |
cdbfd419 | 5153 | #else |
dc146f7c | 5154 | NULL, |
cdbfd419 | 5155 | #endif |
1570b33e | 5156 | linux_core_of_thread, |
219f2f23 PA |
5157 | linux_process_qsupported, |
5158 | linux_supports_tracepoints, | |
5159 | linux_read_pc, | |
8336d594 PA |
5160 | linux_write_pc, |
5161 | linux_thread_stopped, | |
7984d532 | 5162 | NULL, |
711e434b | 5163 | linux_pause_all, |
7984d532 | 5164 | linux_unpause_all, |
fa593d66 PA |
5165 | linux_cancel_breakpoints, |
5166 | linux_stabilize_threads, | |
6a271cae PA |
5167 | linux_install_fast_tracepoint_jump_pad, |
5168 | linux_emit_ops | |
ce3a066d DJ |
5169 | }; |
5170 | ||
0d62e5e8 DJ |
5171 | static void |
5172 | linux_init_signals () | |
5173 | { | |
5174 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5175 | to find what the cancel signal actually is. */ | |
1a981360 | 5176 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5177 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5178 | #endif |
0d62e5e8 DJ |
5179 | } |
5180 | ||
da6d8c04 DJ |
5181 | void |
5182 | initialize_low (void) | |
5183 | { | |
bd99dc85 PA |
5184 | struct sigaction sigchld_action; |
5185 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5186 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5187 | set_breakpoint_data (the_low_target.breakpoint, |
5188 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5189 | linux_init_signals (); |
24a09b5f | 5190 | linux_test_for_tracefork (); |
52fa2412 UW |
5191 | #ifdef HAVE_LINUX_REGSETS |
5192 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
5193 | ; | |
bca929d3 | 5194 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 5195 | #endif |
bd99dc85 PA |
5196 | |
5197 | sigchld_action.sa_handler = sigchld_handler; | |
5198 | sigemptyset (&sigchld_action.sa_mask); | |
5199 | sigchld_action.sa_flags = SA_RESTART; | |
5200 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 5201 | } |