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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, |
4c38e0a4 | 3 | 2006, 2007, 2008, 2009, 2010 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 | ||
42c81e2a DJ |
101 | #ifdef __UCLIBC__ |
102 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
103 | #define HAS_NOMMU | |
104 | #endif | |
105 | #endif | |
106 | ||
24a09b5f DJ |
107 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
108 | representation of the thread ID. | |
611cb4a5 | 109 | |
54a0b537 | 110 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
111 | the same as the LWP ID. |
112 | ||
113 | ``all_processes'' is keyed by the "overall process ID", which | |
114 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 115 | |
54a0b537 | 116 | struct inferior_list all_lwps; |
0d62e5e8 | 117 | |
24a09b5f DJ |
118 | /* A list of all unknown processes which receive stop signals. Some other |
119 | process will presumably claim each of these as forked children | |
120 | momentarily. */ | |
121 | ||
122 | struct inferior_list stopped_pids; | |
123 | ||
0d62e5e8 DJ |
124 | /* FIXME this is a bit of a hack, and could be removed. */ |
125 | int stopping_threads; | |
126 | ||
127 | /* FIXME make into a target method? */ | |
24a09b5f | 128 | int using_threads = 1; |
24a09b5f | 129 | |
fa593d66 PA |
130 | /* True if we're presently stabilizing threads (moving them out of |
131 | jump pads). */ | |
132 | static int stabilizing_threads; | |
133 | ||
95954743 PA |
134 | /* This flag is true iff we've just created or attached to our first |
135 | inferior but it has not stopped yet. As soon as it does, we need | |
136 | to call the low target's arch_setup callback. Doing this only on | |
137 | the first inferior avoids reinializing the architecture on every | |
138 | inferior, and avoids messing with the register caches of the | |
139 | already running inferiors. NOTE: this assumes all inferiors under | |
140 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
141 | static int new_inferior; |
142 | ||
2acc282a | 143 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 144 | int step, int signal, siginfo_t *info); |
2bd7c093 | 145 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
146 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
147 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 148 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 149 | static void *add_lwp (ptid_t ptid); |
c35fafde | 150 | static int linux_stopped_by_watchpoint (void); |
95954743 | 151 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
dc146f7c | 152 | static int linux_core_of_thread (ptid_t ptid); |
d50171e4 | 153 | static void proceed_all_lwps (void); |
d50171e4 PA |
154 | static int finish_step_over (struct lwp_info *lwp); |
155 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
156 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 157 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
158 | |
159 | /* True if the low target can hardware single-step. Such targets | |
160 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
161 | ||
162 | static int | |
163 | can_hardware_single_step (void) | |
164 | { | |
165 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
166 | } | |
167 | ||
168 | /* True if the low target supports memory breakpoints. If so, we'll | |
169 | have a GET_PC implementation. */ | |
170 | ||
171 | static int | |
172 | supports_breakpoints (void) | |
173 | { | |
174 | return (the_low_target.get_pc != NULL); | |
175 | } | |
0d62e5e8 | 176 | |
fa593d66 PA |
177 | /* Returns true if this target can support fast tracepoints. This |
178 | does not mean that the in-process agent has been loaded in the | |
179 | inferior. */ | |
180 | ||
181 | static int | |
182 | supports_fast_tracepoints (void) | |
183 | { | |
184 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
185 | } | |
186 | ||
0d62e5e8 DJ |
187 | struct pending_signals |
188 | { | |
189 | int signal; | |
32ca6d61 | 190 | siginfo_t info; |
0d62e5e8 DJ |
191 | struct pending_signals *prev; |
192 | }; | |
611cb4a5 | 193 | |
14ce3065 DE |
194 | #define PTRACE_ARG3_TYPE void * |
195 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 196 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 197 | |
58caa3dc | 198 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
199 | static char *disabled_regsets; |
200 | static int num_regsets; | |
58caa3dc DJ |
201 | #endif |
202 | ||
bd99dc85 PA |
203 | /* The read/write ends of the pipe registered as waitable file in the |
204 | event loop. */ | |
205 | static int linux_event_pipe[2] = { -1, -1 }; | |
206 | ||
207 | /* True if we're currently in async mode. */ | |
208 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
209 | ||
02fc4de7 | 210 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
211 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
212 | ||
d0722149 DE |
213 | /* Accepts an integer PID; Returns a string representing a file that |
214 | can be opened to get info for the child process. | |
215 | Space for the result is malloc'd, caller must free. */ | |
216 | ||
217 | char * | |
218 | linux_child_pid_to_exec_file (int pid) | |
219 | { | |
220 | char *name1, *name2; | |
221 | ||
222 | name1 = xmalloc (MAXPATHLEN); | |
223 | name2 = xmalloc (MAXPATHLEN); | |
224 | memset (name2, 0, MAXPATHLEN); | |
225 | ||
226 | sprintf (name1, "/proc/%d/exe", pid); | |
227 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
228 | { | |
229 | free (name1); | |
230 | return name2; | |
231 | } | |
232 | else | |
233 | { | |
234 | free (name2); | |
235 | return name1; | |
236 | } | |
237 | } | |
238 | ||
239 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
240 | ||
241 | static int | |
957f3f49 | 242 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
243 | { |
244 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
245 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
246 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
247 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
248 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
249 | } | |
250 | ||
251 | /* Return non-zero if FILE is a 64-bit ELF file, | |
252 | zero if the file is not a 64-bit ELF file, | |
253 | and -1 if the file is not accessible or doesn't exist. */ | |
254 | ||
255 | int | |
256 | elf_64_file_p (const char *file) | |
257 | { | |
957f3f49 | 258 | Elf64_Ehdr header; |
d0722149 DE |
259 | int fd; |
260 | ||
261 | fd = open (file, O_RDONLY); | |
262 | if (fd < 0) | |
263 | return -1; | |
264 | ||
265 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
266 | { | |
267 | close (fd); | |
268 | return 0; | |
269 | } | |
270 | close (fd); | |
271 | ||
272 | return elf_64_header_p (&header); | |
273 | } | |
274 | ||
bd99dc85 PA |
275 | static void |
276 | delete_lwp (struct lwp_info *lwp) | |
277 | { | |
278 | remove_thread (get_lwp_thread (lwp)); | |
279 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 280 | free (lwp->arch_private); |
bd99dc85 PA |
281 | free (lwp); |
282 | } | |
283 | ||
95954743 PA |
284 | /* Add a process to the common process list, and set its private |
285 | data. */ | |
286 | ||
287 | static struct process_info * | |
288 | linux_add_process (int pid, int attached) | |
289 | { | |
290 | struct process_info *proc; | |
291 | ||
292 | /* Is this the first process? If so, then set the arch. */ | |
293 | if (all_processes.head == NULL) | |
294 | new_inferior = 1; | |
295 | ||
296 | proc = add_process (pid, attached); | |
297 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
298 | ||
aa5ca48f DE |
299 | if (the_low_target.new_process != NULL) |
300 | proc->private->arch_private = the_low_target.new_process (); | |
301 | ||
95954743 PA |
302 | return proc; |
303 | } | |
304 | ||
07d4f67e DE |
305 | /* Wrapper function for waitpid which handles EINTR, and emulates |
306 | __WALL for systems where that is not available. */ | |
307 | ||
308 | static int | |
309 | my_waitpid (int pid, int *status, int flags) | |
310 | { | |
311 | int ret, out_errno; | |
312 | ||
313 | if (debug_threads) | |
314 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
315 | ||
316 | if (flags & __WALL) | |
317 | { | |
318 | sigset_t block_mask, org_mask, wake_mask; | |
319 | int wnohang; | |
320 | ||
321 | wnohang = (flags & WNOHANG) != 0; | |
322 | flags &= ~(__WALL | __WCLONE); | |
323 | flags |= WNOHANG; | |
324 | ||
325 | /* Block all signals while here. This avoids knowing about | |
326 | LinuxThread's signals. */ | |
327 | sigfillset (&block_mask); | |
328 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
329 | ||
330 | /* ... except during the sigsuspend below. */ | |
331 | sigemptyset (&wake_mask); | |
332 | ||
333 | while (1) | |
334 | { | |
335 | /* Since all signals are blocked, there's no need to check | |
336 | for EINTR here. */ | |
337 | ret = waitpid (pid, status, flags); | |
338 | out_errno = errno; | |
339 | ||
340 | if (ret == -1 && out_errno != ECHILD) | |
341 | break; | |
342 | else if (ret > 0) | |
343 | break; | |
344 | ||
345 | if (flags & __WCLONE) | |
346 | { | |
347 | /* We've tried both flavors now. If WNOHANG is set, | |
348 | there's nothing else to do, just bail out. */ | |
349 | if (wnohang) | |
350 | break; | |
351 | ||
352 | if (debug_threads) | |
353 | fprintf (stderr, "blocking\n"); | |
354 | ||
355 | /* Block waiting for signals. */ | |
356 | sigsuspend (&wake_mask); | |
357 | } | |
358 | ||
359 | flags ^= __WCLONE; | |
360 | } | |
361 | ||
362 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
363 | } | |
364 | else | |
365 | { | |
366 | do | |
367 | ret = waitpid (pid, status, flags); | |
368 | while (ret == -1 && errno == EINTR); | |
369 | out_errno = errno; | |
370 | } | |
371 | ||
372 | if (debug_threads) | |
373 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
374 | pid, flags, status ? *status : -1, ret); | |
375 | ||
376 | errno = out_errno; | |
377 | return ret; | |
378 | } | |
379 | ||
bd99dc85 PA |
380 | /* Handle a GNU/Linux extended wait response. If we see a clone |
381 | event, we need to add the new LWP to our list (and not report the | |
382 | trap to higher layers). */ | |
0d62e5e8 | 383 | |
24a09b5f | 384 | static void |
54a0b537 | 385 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
386 | { |
387 | int event = wstat >> 16; | |
54a0b537 | 388 | struct lwp_info *new_lwp; |
24a09b5f DJ |
389 | |
390 | if (event == PTRACE_EVENT_CLONE) | |
391 | { | |
95954743 | 392 | ptid_t ptid; |
24a09b5f | 393 | unsigned long new_pid; |
836acd6d | 394 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 395 | |
bd99dc85 | 396 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
397 | |
398 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
399 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
400 | { | |
401 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
402 | hits the SIGSTOP, but we're already attached. */ | |
403 | ||
97438e3f | 404 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
405 | |
406 | if (ret == -1) | |
407 | perror_with_name ("waiting for new child"); | |
408 | else if (ret != new_pid) | |
409 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 410 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
411 | warning ("wait returned unexpected status 0x%x", status); |
412 | } | |
413 | ||
1e7fc18c | 414 | linux_enable_event_reporting (new_pid); |
24a09b5f | 415 | |
95954743 PA |
416 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
417 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
418 | add_thread (ptid, new_lwp); | |
24a09b5f | 419 | |
e27d73f6 DE |
420 | /* Either we're going to immediately resume the new thread |
421 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
422 | thinks the thread is currently running, so set this first | |
423 | before calling linux_resume_one_lwp. */ | |
424 | new_lwp->stopped = 1; | |
425 | ||
da5898ce DJ |
426 | /* Normally we will get the pending SIGSTOP. But in some cases |
427 | we might get another signal delivered to the group first. | |
f21cc1a2 | 428 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
429 | if (WSTOPSIG (status) == SIGSTOP) |
430 | { | |
d50171e4 PA |
431 | if (stopping_threads) |
432 | new_lwp->stop_pc = get_stop_pc (new_lwp); | |
433 | else | |
e27d73f6 | 434 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 435 | } |
24a09b5f | 436 | else |
da5898ce | 437 | { |
54a0b537 | 438 | new_lwp->stop_expected = 1; |
d50171e4 | 439 | |
da5898ce DJ |
440 | if (stopping_threads) |
441 | { | |
d50171e4 | 442 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
443 | new_lwp->status_pending_p = 1; |
444 | new_lwp->status_pending = status; | |
da5898ce DJ |
445 | } |
446 | else | |
447 | /* Pass the signal on. This is what GDB does - except | |
448 | shouldn't we really report it instead? */ | |
e27d73f6 | 449 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 450 | } |
24a09b5f DJ |
451 | |
452 | /* Always resume the current thread. If we are stopping | |
453 | threads, it will have a pending SIGSTOP; we may as well | |
454 | collect it now. */ | |
2acc282a | 455 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
456 | } |
457 | } | |
458 | ||
d50171e4 PA |
459 | /* Return the PC as read from the regcache of LWP, without any |
460 | adjustment. */ | |
461 | ||
462 | static CORE_ADDR | |
463 | get_pc (struct lwp_info *lwp) | |
464 | { | |
465 | struct thread_info *saved_inferior; | |
466 | struct regcache *regcache; | |
467 | CORE_ADDR pc; | |
468 | ||
469 | if (the_low_target.get_pc == NULL) | |
470 | return 0; | |
471 | ||
472 | saved_inferior = current_inferior; | |
473 | current_inferior = get_lwp_thread (lwp); | |
474 | ||
475 | regcache = get_thread_regcache (current_inferior, 1); | |
476 | pc = (*the_low_target.get_pc) (regcache); | |
477 | ||
478 | if (debug_threads) | |
479 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
480 | ||
481 | current_inferior = saved_inferior; | |
482 | return pc; | |
483 | } | |
484 | ||
485 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
486 | The SIGTRAP could mean several things. |
487 | ||
488 | On i386, where decr_pc_after_break is non-zero: | |
489 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
490 | we will get only the one SIGTRAP (even if the instruction we | |
491 | stepped over was a breakpoint). The value of $eip will be the | |
492 | next instruction. | |
493 | If we continue the process using PTRACE_CONT, we will get a | |
494 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
495 | the instruction after the breakpoint (i.e. needs to be | |
496 | decremented). If we report the SIGTRAP to GDB, we must also | |
497 | report the undecremented PC. If we cancel the SIGTRAP, we | |
498 | must resume at the decremented PC. | |
499 | ||
500 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
501 | with hardware or kernel single-step: | |
502 | If we single-step over a breakpoint instruction, our PC will | |
503 | point at the following instruction. If we continue and hit a | |
504 | breakpoint instruction, our PC will point at the breakpoint | |
505 | instruction. */ | |
506 | ||
507 | static CORE_ADDR | |
d50171e4 | 508 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 509 | { |
d50171e4 PA |
510 | CORE_ADDR stop_pc; |
511 | ||
512 | if (the_low_target.get_pc == NULL) | |
513 | return 0; | |
0d62e5e8 | 514 | |
d50171e4 PA |
515 | stop_pc = get_pc (lwp); |
516 | ||
bdabb078 PA |
517 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
518 | && !lwp->stepping | |
519 | && !lwp->stopped_by_watchpoint | |
520 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
521 | stop_pc -= the_low_target.decr_pc_after_break; |
522 | ||
523 | if (debug_threads) | |
524 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
525 | ||
526 | return stop_pc; | |
0d62e5e8 | 527 | } |
ce3a066d | 528 | |
0d62e5e8 | 529 | static void * |
95954743 | 530 | add_lwp (ptid_t ptid) |
611cb4a5 | 531 | { |
54a0b537 | 532 | struct lwp_info *lwp; |
0d62e5e8 | 533 | |
54a0b537 PA |
534 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
535 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 536 | |
95954743 | 537 | lwp->head.id = ptid; |
0d62e5e8 | 538 | |
aa5ca48f DE |
539 | if (the_low_target.new_thread != NULL) |
540 | lwp->arch_private = the_low_target.new_thread (); | |
541 | ||
54a0b537 | 542 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 543 | |
54a0b537 | 544 | return lwp; |
0d62e5e8 | 545 | } |
611cb4a5 | 546 | |
da6d8c04 DJ |
547 | /* Start an inferior process and returns its pid. |
548 | ALLARGS is a vector of program-name and args. */ | |
549 | ||
ce3a066d DJ |
550 | static int |
551 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 552 | { |
a6dbe5df | 553 | struct lwp_info *new_lwp; |
da6d8c04 | 554 | int pid; |
95954743 | 555 | ptid_t ptid; |
da6d8c04 | 556 | |
42c81e2a | 557 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
558 | pid = vfork (); |
559 | #else | |
da6d8c04 | 560 | pid = fork (); |
52fb6437 | 561 | #endif |
da6d8c04 DJ |
562 | if (pid < 0) |
563 | perror_with_name ("fork"); | |
564 | ||
565 | if (pid == 0) | |
566 | { | |
567 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
568 | ||
60c3d7b0 | 569 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 570 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 571 | #endif |
0d62e5e8 | 572 | |
a9fa9f7d DJ |
573 | setpgid (0, 0); |
574 | ||
2b876972 DJ |
575 | execv (program, allargs); |
576 | if (errno == ENOENT) | |
577 | execvp (program, allargs); | |
da6d8c04 DJ |
578 | |
579 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 580 | strerror (errno)); |
da6d8c04 DJ |
581 | fflush (stderr); |
582 | _exit (0177); | |
583 | } | |
584 | ||
95954743 PA |
585 | linux_add_process (pid, 0); |
586 | ||
587 | ptid = ptid_build (pid, pid, 0); | |
588 | new_lwp = add_lwp (ptid); | |
589 | add_thread (ptid, new_lwp); | |
a6dbe5df | 590 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 591 | |
a9fa9f7d | 592 | return pid; |
da6d8c04 DJ |
593 | } |
594 | ||
595 | /* Attach to an inferior process. */ | |
596 | ||
95954743 PA |
597 | static void |
598 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 599 | { |
95954743 | 600 | ptid_t ptid; |
54a0b537 | 601 | struct lwp_info *new_lwp; |
611cb4a5 | 602 | |
95954743 | 603 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 604 | { |
95954743 | 605 | if (!initial) |
2d717e4f DJ |
606 | { |
607 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 608 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
609 | strerror (errno), errno); |
610 | fflush (stderr); | |
611 | return; | |
612 | } | |
613 | else | |
614 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 615 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 616 | strerror (errno), errno); |
da6d8c04 DJ |
617 | } |
618 | ||
95954743 PA |
619 | if (initial) |
620 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
621 | ptid = ptid_build (lwpid, lwpid, 0); | |
622 | else | |
623 | { | |
624 | /* Note that extracting the pid from the current inferior is | |
625 | safe, since we're always called in the context of the same | |
626 | process as this new thread. */ | |
627 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
628 | ptid = ptid_build (pid, lwpid, 0); | |
629 | } | |
24a09b5f | 630 | |
95954743 PA |
631 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
632 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 633 | |
a6dbe5df PA |
634 | /* We need to wait for SIGSTOP before being able to make the next |
635 | ptrace call on this LWP. */ | |
636 | new_lwp->must_set_ptrace_flags = 1; | |
637 | ||
0d62e5e8 | 638 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
639 | brings it to a halt. |
640 | ||
641 | There are several cases to consider here: | |
642 | ||
643 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 644 | of a new thread that is being created. |
d50171e4 PA |
645 | In this case we should ignore that SIGSTOP and resume the |
646 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 647 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 648 | resume_continue. |
0e21c1ec DE |
649 | |
650 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
651 | to it via attach_inferior. |
652 | In this case we want the process thread to stop. | |
d50171e4 PA |
653 | This is handled by having linux_attach set last_resume_kind == |
654 | resume_stop after we return. | |
1b3f6016 PA |
655 | ??? If the process already has several threads we leave the other |
656 | threads running. | |
0e21c1ec DE |
657 | |
658 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
659 | existing threads. |
660 | In this case we want the thread to stop. | |
661 | FIXME: This case is currently not properly handled. | |
662 | We should wait for the SIGSTOP but don't. Things work apparently | |
663 | because enough time passes between when we ptrace (ATTACH) and when | |
664 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
665 | |
666 | On the other hand, if we are currently trying to stop all threads, we | |
667 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 668 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
669 | end of the list, and so the new thread has not yet reached |
670 | wait_for_sigstop (but will). */ | |
d50171e4 | 671 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
672 | } |
673 | ||
95954743 PA |
674 | void |
675 | linux_attach_lwp (unsigned long lwpid) | |
676 | { | |
677 | linux_attach_lwp_1 (lwpid, 0); | |
678 | } | |
679 | ||
0d62e5e8 | 680 | int |
a1928bad | 681 | linux_attach (unsigned long pid) |
0d62e5e8 | 682 | { |
95954743 | 683 | linux_attach_lwp_1 (pid, 1); |
95954743 | 684 | linux_add_process (pid, 1); |
0d62e5e8 | 685 | |
bd99dc85 PA |
686 | if (!non_stop) |
687 | { | |
8336d594 PA |
688 | struct thread_info *thread; |
689 | ||
690 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
691 | process. It will be collected by wait shortly. */ | |
692 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
693 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 694 | } |
0d62e5e8 | 695 | |
95954743 PA |
696 | return 0; |
697 | } | |
698 | ||
699 | struct counter | |
700 | { | |
701 | int pid; | |
702 | int count; | |
703 | }; | |
704 | ||
705 | static int | |
706 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
707 | { | |
708 | struct counter *counter = args; | |
709 | ||
710 | if (ptid_get_pid (entry->id) == counter->pid) | |
711 | { | |
712 | if (++counter->count > 1) | |
713 | return 1; | |
714 | } | |
d61ddec4 | 715 | |
da6d8c04 DJ |
716 | return 0; |
717 | } | |
718 | ||
95954743 PA |
719 | static int |
720 | last_thread_of_process_p (struct thread_info *thread) | |
721 | { | |
722 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
723 | int pid = ptid_get_pid (ptid); | |
724 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 725 | |
95954743 PA |
726 | return (find_inferior (&all_threads, |
727 | second_thread_of_pid_p, &counter) == NULL); | |
728 | } | |
729 | ||
730 | /* Kill the inferior lwp. */ | |
731 | ||
732 | static int | |
733 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 734 | { |
0d62e5e8 | 735 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 736 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 737 | int wstat; |
95954743 PA |
738 | int pid = * (int *) args; |
739 | ||
740 | if (ptid_get_pid (entry->id) != pid) | |
741 | return 0; | |
0d62e5e8 | 742 | |
fd500816 DJ |
743 | /* We avoid killing the first thread here, because of a Linux kernel (at |
744 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
745 | the children get a chance to be reaped, it will remain a zombie | |
746 | forever. */ | |
95954743 | 747 | |
12b42a12 | 748 | if (lwpid_of (lwp) == pid) |
95954743 PA |
749 | { |
750 | if (debug_threads) | |
751 | fprintf (stderr, "lkop: is last of process %s\n", | |
752 | target_pid_to_str (entry->id)); | |
753 | return 0; | |
754 | } | |
fd500816 | 755 | |
0d62e5e8 DJ |
756 | do |
757 | { | |
bd99dc85 | 758 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
759 | |
760 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 761 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 762 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
763 | |
764 | return 0; | |
da6d8c04 DJ |
765 | } |
766 | ||
95954743 PA |
767 | static int |
768 | linux_kill (int pid) | |
0d62e5e8 | 769 | { |
95954743 | 770 | struct process_info *process; |
54a0b537 | 771 | struct lwp_info *lwp; |
95954743 | 772 | struct thread_info *thread; |
fd500816 | 773 | int wstat; |
95954743 | 774 | int lwpid; |
fd500816 | 775 | |
95954743 PA |
776 | process = find_process_pid (pid); |
777 | if (process == NULL) | |
778 | return -1; | |
9d606399 | 779 | |
f9e39928 PA |
780 | /* If we're killing a running inferior, make sure it is stopped |
781 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 782 | stop_all_lwps (0, NULL); |
f9e39928 | 783 | |
95954743 | 784 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 785 | |
54a0b537 | 786 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 787 | thread in the list, so do so now. */ |
95954743 PA |
788 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
789 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
790 | |
791 | if (debug_threads) | |
95954743 PA |
792 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
793 | lwpid_of (lwp), pid); | |
bd99dc85 | 794 | |
fd500816 DJ |
795 | do |
796 | { | |
bd99dc85 | 797 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
798 | |
799 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
800 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
801 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 802 | |
8336d594 | 803 | the_target->mourn (process); |
f9e39928 PA |
804 | |
805 | /* Since we presently can only stop all lwps of all processes, we | |
806 | need to unstop lwps of other processes. */ | |
7984d532 | 807 | unstop_all_lwps (0, NULL); |
95954743 | 808 | return 0; |
0d62e5e8 DJ |
809 | } |
810 | ||
95954743 PA |
811 | static int |
812 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
813 | { |
814 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 815 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
816 | int pid = * (int *) args; |
817 | ||
818 | if (ptid_get_pid (entry->id) != pid) | |
819 | return 0; | |
6ad8ae5c | 820 | |
ae13219e DJ |
821 | /* If this process is stopped but is expecting a SIGSTOP, then make |
822 | sure we take care of that now. This isn't absolutely guaranteed | |
823 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 824 | if (lwp->stop_expected) |
ae13219e | 825 | { |
bd99dc85 | 826 | int wstat; |
ae13219e | 827 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 | 828 | lwp->stop_expected = 0; |
f9e39928 | 829 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 830 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
831 | } |
832 | ||
833 | /* Flush any pending changes to the process's registers. */ | |
834 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 835 | get_lwp_thread (lwp)); |
ae13219e DJ |
836 | |
837 | /* Finally, let it resume. */ | |
bd99dc85 PA |
838 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
839 | ||
840 | delete_lwp (lwp); | |
95954743 | 841 | return 0; |
6ad8ae5c DJ |
842 | } |
843 | ||
95954743 PA |
844 | static int |
845 | linux_detach (int pid) | |
846 | { | |
847 | struct process_info *process; | |
848 | ||
849 | process = find_process_pid (pid); | |
850 | if (process == NULL) | |
851 | return -1; | |
852 | ||
f9e39928 PA |
853 | /* Stop all threads before detaching. First, ptrace requires that |
854 | the thread is stopped to sucessfully detach. Second, thread_db | |
855 | may need to uninstall thread event breakpoints from memory, which | |
856 | only works with a stopped process anyway. */ | |
7984d532 | 857 | stop_all_lwps (0, NULL); |
f9e39928 | 858 | |
ca5c370d | 859 | #ifdef USE_THREAD_DB |
8336d594 | 860 | thread_db_detach (process); |
ca5c370d PA |
861 | #endif |
862 | ||
fa593d66 PA |
863 | /* Stabilize threads (move out of jump pads). */ |
864 | stabilize_threads (); | |
865 | ||
95954743 | 866 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
867 | |
868 | the_target->mourn (process); | |
f9e39928 PA |
869 | |
870 | /* Since we presently can only stop all lwps of all processes, we | |
871 | need to unstop lwps of other processes. */ | |
7984d532 | 872 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
873 | return 0; |
874 | } | |
875 | ||
876 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
877 | ||
878 | static int | |
879 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
880 | { | |
881 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
882 | struct process_info *process = proc; | |
883 | ||
884 | if (pid_of (lwp) == pid_of (process)) | |
885 | delete_lwp (lwp); | |
886 | ||
dd6953e1 | 887 | return 0; |
6ad8ae5c DJ |
888 | } |
889 | ||
8336d594 PA |
890 | static void |
891 | linux_mourn (struct process_info *process) | |
892 | { | |
893 | struct process_info_private *priv; | |
894 | ||
895 | #ifdef USE_THREAD_DB | |
896 | thread_db_mourn (process); | |
897 | #endif | |
898 | ||
f9e39928 PA |
899 | find_inferior (&all_lwps, delete_lwp_callback, process); |
900 | ||
8336d594 PA |
901 | /* Freeing all private data. */ |
902 | priv = process->private; | |
903 | free (priv->arch_private); | |
904 | free (priv); | |
905 | process->private = NULL; | |
505106cd PA |
906 | |
907 | remove_process (process); | |
8336d594 PA |
908 | } |
909 | ||
444d6139 | 910 | static void |
95954743 | 911 | linux_join (int pid) |
444d6139 | 912 | { |
444d6139 | 913 | int status, ret; |
95954743 | 914 | struct process_info *process; |
bd99dc85 | 915 | |
95954743 PA |
916 | process = find_process_pid (pid); |
917 | if (process == NULL) | |
918 | return; | |
444d6139 PA |
919 | |
920 | do { | |
95954743 | 921 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
922 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
923 | break; | |
924 | } while (ret != -1 || errno != ECHILD); | |
925 | } | |
926 | ||
6ad8ae5c | 927 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 928 | static int |
95954743 | 929 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 930 | { |
95954743 PA |
931 | struct lwp_info *lwp = find_lwp_pid (ptid); |
932 | ||
933 | /* We assume we always know if a thread exits. If a whole process | |
934 | exited but we still haven't been able to report it to GDB, we'll | |
935 | hold on to the last lwp of the dead process. */ | |
936 | if (lwp != NULL) | |
937 | return !lwp->dead; | |
0d62e5e8 DJ |
938 | else |
939 | return 0; | |
940 | } | |
941 | ||
6bf5e0ba | 942 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 943 | static int |
d50171e4 | 944 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 945 | { |
54a0b537 | 946 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 947 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 948 | struct thread_info *thread; |
95954743 PA |
949 | |
950 | /* Check if we're only interested in events from a specific process | |
951 | or its lwps. */ | |
952 | if (!ptid_equal (minus_one_ptid, ptid) | |
953 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
954 | return 0; | |
0d62e5e8 | 955 | |
d50171e4 PA |
956 | thread = get_lwp_thread (lwp); |
957 | ||
958 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
959 | report any status pending the LWP may have. */ | |
8336d594 | 960 | if (thread->last_resume_kind == resume_stop |
7984d532 | 961 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 962 | return 0; |
0d62e5e8 | 963 | |
d50171e4 | 964 | return lwp->status_pending_p; |
0d62e5e8 DJ |
965 | } |
966 | ||
95954743 PA |
967 | static int |
968 | same_lwp (struct inferior_list_entry *entry, void *data) | |
969 | { | |
970 | ptid_t ptid = *(ptid_t *) data; | |
971 | int lwp; | |
972 | ||
973 | if (ptid_get_lwp (ptid) != 0) | |
974 | lwp = ptid_get_lwp (ptid); | |
975 | else | |
976 | lwp = ptid_get_pid (ptid); | |
977 | ||
978 | if (ptid_get_lwp (entry->id) == lwp) | |
979 | return 1; | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
984 | struct lwp_info * | |
985 | find_lwp_pid (ptid_t ptid) | |
986 | { | |
987 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
988 | } | |
989 | ||
bd99dc85 | 990 | static struct lwp_info * |
95954743 | 991 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 992 | { |
0d62e5e8 | 993 | int ret; |
95954743 | 994 | int to_wait_for = -1; |
bd99dc85 | 995 | struct lwp_info *child = NULL; |
0d62e5e8 | 996 | |
bd99dc85 | 997 | if (debug_threads) |
95954743 PA |
998 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
999 | ||
1000 | if (ptid_equal (ptid, minus_one_ptid)) | |
1001 | to_wait_for = -1; /* any child */ | |
1002 | else | |
1003 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1004 | |
bd99dc85 | 1005 | options |= __WALL; |
0d62e5e8 | 1006 | |
bd99dc85 | 1007 | retry: |
0d62e5e8 | 1008 | |
bd99dc85 PA |
1009 | ret = my_waitpid (to_wait_for, wstatp, options); |
1010 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1011 | return NULL; | |
1012 | else if (ret == -1) | |
1013 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1014 | |
1015 | if (debug_threads | |
1016 | && (!WIFSTOPPED (*wstatp) | |
1017 | || (WSTOPSIG (*wstatp) != 32 | |
1018 | && WSTOPSIG (*wstatp) != 33))) | |
1019 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1020 | ||
95954743 | 1021 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1022 | |
24a09b5f DJ |
1023 | /* If we didn't find a process, one of two things presumably happened: |
1024 | - A process we started and then detached from has exited. Ignore it. | |
1025 | - A process we are controlling has forked and the new child's stop | |
1026 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1027 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1028 | { |
1029 | add_pid_to_list (&stopped_pids, ret); | |
1030 | goto retry; | |
1031 | } | |
bd99dc85 | 1032 | else if (child == NULL) |
24a09b5f DJ |
1033 | goto retry; |
1034 | ||
bd99dc85 | 1035 | child->stopped = 1; |
0d62e5e8 | 1036 | |
bd99dc85 | 1037 | child->last_status = *wstatp; |
32ca6d61 | 1038 | |
d61ddec4 UW |
1039 | /* Architecture-specific setup after inferior is running. |
1040 | This needs to happen after we have attached to the inferior | |
1041 | and it is stopped for the first time, but before we access | |
1042 | any inferior registers. */ | |
1043 | if (new_inferior) | |
1044 | { | |
1045 | the_low_target.arch_setup (); | |
52fa2412 UW |
1046 | #ifdef HAVE_LINUX_REGSETS |
1047 | memset (disabled_regsets, 0, num_regsets); | |
1048 | #endif | |
d61ddec4 UW |
1049 | new_inferior = 0; |
1050 | } | |
1051 | ||
c3adc08c PA |
1052 | /* Fetch the possibly triggered data watchpoint info and store it in |
1053 | CHILD. | |
1054 | ||
1055 | On some archs, like x86, that use debug registers to set | |
1056 | watchpoints, it's possible that the way to know which watched | |
1057 | address trapped, is to check the register that is used to select | |
1058 | which address to watch. Problem is, between setting the | |
1059 | watchpoint and reading back which data address trapped, the user | |
1060 | may change the set of watchpoints, and, as a consequence, GDB | |
1061 | changes the debug registers in the inferior. To avoid reading | |
1062 | back a stale stopped-data-address when that happens, we cache in | |
1063 | LP the fact that a watchpoint trapped, and the corresponding data | |
1064 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1065 | changes the debug registers meanwhile, we have the cached data we | |
1066 | can rely on. */ | |
1067 | ||
1068 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1069 | { | |
1070 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1071 | { | |
1072 | child->stopped_by_watchpoint = 0; | |
1073 | } | |
1074 | else | |
1075 | { | |
1076 | struct thread_info *saved_inferior; | |
1077 | ||
1078 | saved_inferior = current_inferior; | |
1079 | current_inferior = get_lwp_thread (child); | |
1080 | ||
1081 | child->stopped_by_watchpoint | |
1082 | = the_low_target.stopped_by_watchpoint (); | |
1083 | ||
1084 | if (child->stopped_by_watchpoint) | |
1085 | { | |
1086 | if (the_low_target.stopped_data_address != NULL) | |
1087 | child->stopped_data_address | |
1088 | = the_low_target.stopped_data_address (); | |
1089 | else | |
1090 | child->stopped_data_address = 0; | |
1091 | } | |
1092 | ||
1093 | current_inferior = saved_inferior; | |
1094 | } | |
1095 | } | |
1096 | ||
d50171e4 PA |
1097 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1098 | architecture being defined already (so that CHILD has a valid | |
1099 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1100 | not). */ | |
1101 | if (WIFSTOPPED (*wstatp)) | |
1102 | child->stop_pc = get_stop_pc (child); | |
1103 | ||
0d62e5e8 | 1104 | if (debug_threads |
47c0c975 DE |
1105 | && WIFSTOPPED (*wstatp) |
1106 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1107 | { |
896c7fbb | 1108 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1109 | struct regcache *regcache; |
47c0c975 DE |
1110 | CORE_ADDR pc; |
1111 | ||
d50171e4 | 1112 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1113 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1114 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1115 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1116 | current_inferior = saved_inferior; |
0d62e5e8 | 1117 | } |
bd99dc85 PA |
1118 | |
1119 | return child; | |
0d62e5e8 | 1120 | } |
611cb4a5 | 1121 | |
219f2f23 PA |
1122 | /* This function should only be called if the LWP got a SIGTRAP. |
1123 | ||
1124 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1125 | event was handled, 0 otherwise. */ | |
1126 | ||
1127 | static int | |
1128 | handle_tracepoints (struct lwp_info *lwp) | |
1129 | { | |
1130 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1131 | int tpoint_related_event = 0; | |
1132 | ||
7984d532 PA |
1133 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1134 | uninsert tracepoints. To do this, we temporarily pause all | |
1135 | threads, unpatch away, and then unpause threads. We need to make | |
1136 | sure the unpausing doesn't resume LWP too. */ | |
1137 | lwp->suspended++; | |
1138 | ||
219f2f23 PA |
1139 | /* And we need to be sure that any all-threads-stopping doesn't try |
1140 | to move threads out of the jump pads, as it could deadlock the | |
1141 | inferior (LWP could be in the jump pad, maybe even holding the | |
1142 | lock.) */ | |
1143 | ||
1144 | /* Do any necessary step collect actions. */ | |
1145 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1146 | ||
fa593d66 PA |
1147 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1148 | ||
219f2f23 PA |
1149 | /* See if we just hit a tracepoint and do its main collect |
1150 | actions. */ | |
1151 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1152 | ||
7984d532 PA |
1153 | lwp->suspended--; |
1154 | ||
1155 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1156 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1157 | |
219f2f23 PA |
1158 | if (tpoint_related_event) |
1159 | { | |
1160 | if (debug_threads) | |
1161 | fprintf (stderr, "got a tracepoint event\n"); | |
1162 | return 1; | |
1163 | } | |
1164 | ||
1165 | return 0; | |
1166 | } | |
1167 | ||
fa593d66 PA |
1168 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1169 | fast tracepoint. */ | |
1170 | ||
1171 | static int | |
1172 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1173 | struct fast_tpoint_collect_status *status) | |
1174 | { | |
1175 | CORE_ADDR thread_area; | |
1176 | ||
1177 | if (the_low_target.get_thread_area == NULL) | |
1178 | return 0; | |
1179 | ||
1180 | /* Get the thread area address. This is used to recognize which | |
1181 | thread is which when tracing with the in-process agent library. | |
1182 | We don't read anything from the address, and treat it as opaque; | |
1183 | it's the address itself that we assume is unique per-thread. */ | |
1184 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1185 | return 0; | |
1186 | ||
1187 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1188 | } | |
1189 | ||
1190 | /* The reason we resume in the caller, is because we want to be able | |
1191 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1192 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1193 | refuses to resume. */ | |
1194 | ||
1195 | static int | |
1196 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1197 | { | |
1198 | struct thread_info *saved_inferior; | |
1199 | ||
1200 | saved_inferior = current_inferior; | |
1201 | current_inferior = get_lwp_thread (lwp); | |
1202 | ||
1203 | if ((wstat == NULL | |
1204 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1205 | && supports_fast_tracepoints () | |
1206 | && in_process_agent_loaded ()) | |
1207 | { | |
1208 | struct fast_tpoint_collect_status status; | |
1209 | int r; | |
1210 | ||
1211 | if (debug_threads) | |
1212 | fprintf (stderr, "\ | |
1213 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1214 | lwpid_of (lwp)); | |
1215 | ||
1216 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1217 | ||
1218 | if (wstat == NULL | |
1219 | || (WSTOPSIG (*wstat) != SIGILL | |
1220 | && WSTOPSIG (*wstat) != SIGFPE | |
1221 | && WSTOPSIG (*wstat) != SIGSEGV | |
1222 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1223 | { | |
1224 | lwp->collecting_fast_tracepoint = r; | |
1225 | ||
1226 | if (r != 0) | |
1227 | { | |
1228 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1229 | { | |
1230 | /* Haven't executed the original instruction yet. | |
1231 | Set breakpoint there, and wait till it's hit, | |
1232 | then single-step until exiting the jump pad. */ | |
1233 | lwp->exit_jump_pad_bkpt | |
1234 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1235 | } | |
1236 | ||
1237 | if (debug_threads) | |
1238 | fprintf (stderr, "\ | |
1239 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1240 | lwpid_of (lwp)); | |
1241 | ||
1242 | return 1; | |
1243 | } | |
1244 | } | |
1245 | else | |
1246 | { | |
1247 | /* If we get a synchronous signal while collecting, *and* | |
1248 | while executing the (relocated) original instruction, | |
1249 | reset the PC to point at the tpoint address, before | |
1250 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1251 | report the signal to GDB, and pray for the best. */ | |
1252 | ||
1253 | lwp->collecting_fast_tracepoint = 0; | |
1254 | ||
1255 | if (r != 0 | |
1256 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1257 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1258 | { | |
1259 | siginfo_t info; | |
1260 | struct regcache *regcache; | |
1261 | ||
1262 | /* The si_addr on a few signals references the address | |
1263 | of the faulting instruction. Adjust that as | |
1264 | well. */ | |
1265 | if ((WSTOPSIG (*wstat) == SIGILL | |
1266 | || WSTOPSIG (*wstat) == SIGFPE | |
1267 | || WSTOPSIG (*wstat) == SIGBUS | |
1268 | || WSTOPSIG (*wstat) == SIGSEGV) | |
1269 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &info) == 0 | |
1270 | /* Final check just to make sure we don't clobber | |
1271 | the siginfo of non-kernel-sent signals. */ | |
1272 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1273 | { | |
1274 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
1275 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &info); | |
1276 | } | |
1277 | ||
1278 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1279 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1280 | lwp->stop_pc = status.tpoint_addr; | |
1281 | ||
1282 | /* Cancel any fast tracepoint lock this thread was | |
1283 | holding. */ | |
1284 | force_unlock_trace_buffer (); | |
1285 | } | |
1286 | ||
1287 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1288 | { | |
1289 | if (debug_threads) | |
1290 | fprintf (stderr, | |
1291 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1292 | "stopping all threads momentarily.\n"); | |
1293 | ||
1294 | stop_all_lwps (1, lwp); | |
1295 | cancel_breakpoints (); | |
1296 | ||
1297 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1298 | lwp->exit_jump_pad_bkpt = NULL; | |
1299 | ||
1300 | unstop_all_lwps (1, lwp); | |
1301 | ||
1302 | gdb_assert (lwp->suspended >= 0); | |
1303 | } | |
1304 | } | |
1305 | } | |
1306 | ||
1307 | if (debug_threads) | |
1308 | fprintf (stderr, "\ | |
1309 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1310 | lwpid_of (lwp)); | |
1311 | return 0; | |
1312 | } | |
1313 | ||
1314 | /* Enqueue one signal in the "signals to report later when out of the | |
1315 | jump pad" list. */ | |
1316 | ||
1317 | static void | |
1318 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1319 | { | |
1320 | struct pending_signals *p_sig; | |
1321 | ||
1322 | if (debug_threads) | |
1323 | fprintf (stderr, "\ | |
1324 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1325 | ||
1326 | if (debug_threads) | |
1327 | { | |
1328 | struct pending_signals *sig; | |
1329 | ||
1330 | for (sig = lwp->pending_signals_to_report; | |
1331 | sig != NULL; | |
1332 | sig = sig->prev) | |
1333 | fprintf (stderr, | |
1334 | " Already queued %d\n", | |
1335 | sig->signal); | |
1336 | ||
1337 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1338 | } | |
1339 | ||
1340 | p_sig = xmalloc (sizeof (*p_sig)); | |
1341 | p_sig->prev = lwp->pending_signals_to_report; | |
1342 | p_sig->signal = WSTOPSIG (*wstat); | |
1343 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1344 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1345 | ||
1346 | lwp->pending_signals_to_report = p_sig; | |
1347 | } | |
1348 | ||
1349 | /* Dequeue one signal from the "signals to report later when out of | |
1350 | the jump pad" list. */ | |
1351 | ||
1352 | static int | |
1353 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1354 | { | |
1355 | if (lwp->pending_signals_to_report != NULL) | |
1356 | { | |
1357 | struct pending_signals **p_sig; | |
1358 | ||
1359 | p_sig = &lwp->pending_signals_to_report; | |
1360 | while ((*p_sig)->prev != NULL) | |
1361 | p_sig = &(*p_sig)->prev; | |
1362 | ||
1363 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1364 | if ((*p_sig)->info.si_signo != 0) | |
1365 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); | |
1366 | free (*p_sig); | |
1367 | *p_sig = NULL; | |
1368 | ||
1369 | if (debug_threads) | |
1370 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1371 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1372 | ||
1373 | if (debug_threads) | |
1374 | { | |
1375 | struct pending_signals *sig; | |
1376 | ||
1377 | for (sig = lwp->pending_signals_to_report; | |
1378 | sig != NULL; | |
1379 | sig = sig->prev) | |
1380 | fprintf (stderr, | |
1381 | " Still queued %d\n", | |
1382 | sig->signal); | |
1383 | ||
1384 | fprintf (stderr, " (no more queued signals)\n"); | |
1385 | } | |
1386 | ||
1387 | return 1; | |
1388 | } | |
1389 | ||
1390 | return 0; | |
1391 | } | |
1392 | ||
d50171e4 PA |
1393 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1394 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1395 | will handle the current event, eventually we will resume this LWP, | |
1396 | and this breakpoint will trap again. */ | |
1397 | ||
1398 | static int | |
1399 | cancel_breakpoint (struct lwp_info *lwp) | |
1400 | { | |
1401 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1402 | |
1403 | /* There's nothing to do if we don't support breakpoints. */ | |
1404 | if (!supports_breakpoints ()) | |
1405 | return 0; | |
1406 | ||
d50171e4 PA |
1407 | /* breakpoint_at reads from current inferior. */ |
1408 | saved_inferior = current_inferior; | |
1409 | current_inferior = get_lwp_thread (lwp); | |
1410 | ||
1411 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1412 | { | |
1413 | if (debug_threads) | |
1414 | fprintf (stderr, | |
1415 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1416 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1417 | |
1418 | /* Back up the PC if necessary. */ | |
1419 | if (the_low_target.decr_pc_after_break) | |
1420 | { | |
1421 | struct regcache *regcache | |
fc7238bb | 1422 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1423 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1424 | } | |
1425 | ||
1426 | current_inferior = saved_inferior; | |
1427 | return 1; | |
1428 | } | |
1429 | else | |
1430 | { | |
1431 | if (debug_threads) | |
1432 | fprintf (stderr, | |
1433 | "CB: No breakpoint found at %s for [%s]\n", | |
1434 | paddress (lwp->stop_pc), | |
fc7238bb | 1435 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1436 | } |
1437 | ||
1438 | current_inferior = saved_inferior; | |
1439 | return 0; | |
1440 | } | |
1441 | ||
1442 | /* When the event-loop is doing a step-over, this points at the thread | |
1443 | being stepped. */ | |
1444 | ptid_t step_over_bkpt; | |
1445 | ||
bd99dc85 PA |
1446 | /* Wait for an event from child PID. If PID is -1, wait for any |
1447 | child. Store the stop status through the status pointer WSTAT. | |
1448 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1449 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1450 | the stopped child otherwise. */ | |
1451 | ||
0d62e5e8 | 1452 | static int |
95954743 | 1453 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1454 | { |
d50171e4 PA |
1455 | struct lwp_info *event_child, *requested_child; |
1456 | ||
d50171e4 PA |
1457 | event_child = NULL; |
1458 | requested_child = NULL; | |
0d62e5e8 | 1459 | |
95954743 | 1460 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1461 | |
95954743 PA |
1462 | if (ptid_equal (ptid, minus_one_ptid) |
1463 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1464 | { |
54a0b537 | 1465 | event_child = (struct lwp_info *) |
d50171e4 | 1466 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1467 | if (debug_threads && event_child) |
bd99dc85 | 1468 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1469 | } |
1470 | else | |
1471 | { | |
95954743 | 1472 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1473 | |
fa593d66 PA |
1474 | if (!stopping_threads |
1475 | && requested_child->status_pending_p | |
1476 | && requested_child->collecting_fast_tracepoint) | |
1477 | { | |
1478 | enqueue_one_deferred_signal (requested_child, | |
1479 | &requested_child->status_pending); | |
1480 | requested_child->status_pending_p = 0; | |
1481 | requested_child->status_pending = 0; | |
1482 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1483 | } | |
1484 | ||
1485 | if (requested_child->suspended | |
1486 | && requested_child->status_pending_p) | |
1487 | fatal ("requesting an event out of a suspended child?"); | |
1488 | ||
d50171e4 | 1489 | if (requested_child->status_pending_p) |
bd99dc85 | 1490 | event_child = requested_child; |
0d62e5e8 | 1491 | } |
611cb4a5 | 1492 | |
0d62e5e8 DJ |
1493 | if (event_child != NULL) |
1494 | { | |
bd99dc85 PA |
1495 | if (debug_threads) |
1496 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1497 | lwpid_of (event_child), event_child->status_pending); | |
1498 | *wstat = event_child->status_pending; | |
1499 | event_child->status_pending_p = 0; | |
1500 | event_child->status_pending = 0; | |
1501 | current_inferior = get_lwp_thread (event_child); | |
1502 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1503 | } |
1504 | ||
1505 | /* We only enter this loop if no process has a pending wait status. Thus | |
1506 | any action taken in response to a wait status inside this loop is | |
1507 | responding as soon as we detect the status, not after any pending | |
1508 | events. */ | |
1509 | while (1) | |
1510 | { | |
6bf5e0ba | 1511 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1512 | |
bd99dc85 | 1513 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1514 | { |
1515 | if (debug_threads) | |
1516 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1517 | return 0; | |
1518 | } | |
0d62e5e8 DJ |
1519 | |
1520 | if (event_child == NULL) | |
1521 | error ("event from unknown child"); | |
611cb4a5 | 1522 | |
bd99dc85 | 1523 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1524 | |
89be2091 | 1525 | /* Check for thread exit. */ |
bd99dc85 | 1526 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1527 | { |
89be2091 | 1528 | if (debug_threads) |
95954743 | 1529 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1530 | |
1531 | /* If the last thread is exiting, just return. */ | |
95954743 | 1532 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1533 | { |
1534 | if (debug_threads) | |
95954743 PA |
1535 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1536 | lwpid_of (event_child)); | |
bd99dc85 PA |
1537 | return lwpid_of (event_child); |
1538 | } | |
89be2091 | 1539 | |
bd99dc85 PA |
1540 | if (!non_stop) |
1541 | { | |
1542 | current_inferior = (struct thread_info *) all_threads.head; | |
1543 | if (debug_threads) | |
1544 | fprintf (stderr, "Current inferior is now %ld\n", | |
1545 | lwpid_of (get_thread_lwp (current_inferior))); | |
1546 | } | |
1547 | else | |
1548 | { | |
1549 | current_inferior = NULL; | |
1550 | if (debug_threads) | |
1551 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1552 | } | |
89be2091 DJ |
1553 | |
1554 | /* If we were waiting for this particular child to do something... | |
1555 | well, it did something. */ | |
bd99dc85 | 1556 | if (requested_child != NULL) |
d50171e4 PA |
1557 | { |
1558 | int lwpid = lwpid_of (event_child); | |
1559 | ||
1560 | /* Cancel the step-over operation --- the thread that | |
1561 | started it is gone. */ | |
1562 | if (finish_step_over (event_child)) | |
7984d532 | 1563 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1564 | delete_lwp (event_child); |
1565 | return lwpid; | |
1566 | } | |
1567 | ||
1568 | delete_lwp (event_child); | |
89be2091 DJ |
1569 | |
1570 | /* Wait for a more interesting event. */ | |
1571 | continue; | |
1572 | } | |
1573 | ||
a6dbe5df PA |
1574 | if (event_child->must_set_ptrace_flags) |
1575 | { | |
1e7fc18c | 1576 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1577 | event_child->must_set_ptrace_flags = 0; |
1578 | } | |
1579 | ||
bd99dc85 PA |
1580 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1581 | && *wstat >> 16 != 0) | |
24a09b5f | 1582 | { |
bd99dc85 | 1583 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1584 | continue; |
1585 | } | |
1586 | ||
d50171e4 PA |
1587 | if (WIFSTOPPED (*wstat) |
1588 | && WSTOPSIG (*wstat) == SIGSTOP | |
1589 | && event_child->stop_expected) | |
1590 | { | |
1591 | int should_stop; | |
1592 | ||
1593 | if (debug_threads) | |
1594 | fprintf (stderr, "Expected stop.\n"); | |
1595 | event_child->stop_expected = 0; | |
1596 | ||
8336d594 | 1597 | should_stop = (current_inferior->last_resume_kind == resume_stop |
d50171e4 PA |
1598 | || stopping_threads); |
1599 | ||
1600 | if (!should_stop) | |
1601 | { | |
1602 | linux_resume_one_lwp (event_child, | |
1603 | event_child->stepping, 0, NULL); | |
1604 | continue; | |
1605 | } | |
1606 | } | |
1607 | ||
bd99dc85 | 1608 | return lwpid_of (event_child); |
611cb4a5 | 1609 | } |
0d62e5e8 | 1610 | |
611cb4a5 DJ |
1611 | /* NOTREACHED */ |
1612 | return 0; | |
1613 | } | |
1614 | ||
95954743 PA |
1615 | static int |
1616 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1617 | { | |
1618 | ptid_t wait_ptid; | |
1619 | ||
1620 | if (ptid_is_pid (ptid)) | |
1621 | { | |
1622 | /* A request to wait for a specific tgid. This is not possible | |
1623 | with waitpid, so instead, we wait for any child, and leave | |
1624 | children we're not interested in right now with a pending | |
1625 | status to report later. */ | |
1626 | wait_ptid = minus_one_ptid; | |
1627 | } | |
1628 | else | |
1629 | wait_ptid = ptid; | |
1630 | ||
1631 | while (1) | |
1632 | { | |
1633 | int event_pid; | |
1634 | ||
1635 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1636 | ||
1637 | if (event_pid > 0 | |
1638 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1639 | { | |
1640 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1641 | ||
1642 | if (! WIFSTOPPED (*wstat)) | |
1643 | mark_lwp_dead (event_child, *wstat); | |
1644 | else | |
1645 | { | |
1646 | event_child->status_pending_p = 1; | |
1647 | event_child->status_pending = *wstat; | |
1648 | } | |
1649 | } | |
1650 | else | |
1651 | return event_pid; | |
1652 | } | |
1653 | } | |
1654 | ||
6bf5e0ba PA |
1655 | |
1656 | /* Count the LWP's that have had events. */ | |
1657 | ||
1658 | static int | |
1659 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1660 | { | |
1661 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1662 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1663 | int *count = data; |
1664 | ||
1665 | gdb_assert (count != NULL); | |
1666 | ||
1667 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1668 | should be reported to GDB. */ | |
8336d594 PA |
1669 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1670 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
1671 | && lp->status_pending_p |
1672 | && WIFSTOPPED (lp->status_pending) | |
1673 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1674 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1675 | (*count)++; | |
1676 | ||
1677 | return 0; | |
1678 | } | |
1679 | ||
1680 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1681 | ||
1682 | static int | |
1683 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1684 | { | |
1685 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1686 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 1687 | |
8336d594 PA |
1688 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1689 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
1690 | && lp->status_pending_p) |
1691 | return 1; | |
1692 | else | |
1693 | return 0; | |
1694 | } | |
1695 | ||
1696 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1697 | reported to GDB. */ | |
1698 | ||
1699 | static int | |
1700 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1701 | { | |
1702 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1703 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1704 | int *selector = data; |
1705 | ||
1706 | gdb_assert (selector != NULL); | |
1707 | ||
1708 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
1709 | if (thread->last_resume_kind != resume_stop |
1710 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1711 | && lp->status_pending_p |
1712 | && WIFSTOPPED (lp->status_pending) | |
1713 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1714 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1715 | if ((*selector)-- == 0) | |
1716 | return 1; | |
1717 | ||
1718 | return 0; | |
1719 | } | |
1720 | ||
1721 | static int | |
1722 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
1723 | { | |
1724 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1725 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1726 | struct lwp_info *event_lp = data; |
1727 | ||
1728 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1729 | if (lp == event_lp) | |
1730 | return 0; | |
1731 | ||
1732 | /* If a LWP other than the LWP that we're reporting an event for has | |
1733 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1734 | then just arrange for it to hit it again later. We don't keep | |
1735 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1736 | LWP. We will handle the current event, eventually we will resume | |
1737 | all LWPs, and this one will get its breakpoint trap again. | |
1738 | ||
1739 | If we do not do this, then we run the risk that the user will | |
1740 | delete or disable the breakpoint, but the LWP will have already | |
1741 | tripped on it. */ | |
1742 | ||
8336d594 PA |
1743 | if (thread->last_resume_kind != resume_stop |
1744 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1745 | && lp->status_pending_p |
1746 | && WIFSTOPPED (lp->status_pending) | |
1747 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
1748 | && !lp->stepping |
1749 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
1750 | && cancel_breakpoint (lp)) |
1751 | /* Throw away the SIGTRAP. */ | |
1752 | lp->status_pending_p = 0; | |
1753 | ||
1754 | return 0; | |
1755 | } | |
1756 | ||
7984d532 PA |
1757 | static void |
1758 | linux_cancel_breakpoints (void) | |
1759 | { | |
1760 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
1761 | } | |
1762 | ||
6bf5e0ba PA |
1763 | /* Select one LWP out of those that have events pending. */ |
1764 | ||
1765 | static void | |
1766 | select_event_lwp (struct lwp_info **orig_lp) | |
1767 | { | |
1768 | int num_events = 0; | |
1769 | int random_selector; | |
1770 | struct lwp_info *event_lp; | |
1771 | ||
1772 | /* Give preference to any LWP that is being single-stepped. */ | |
1773 | event_lp | |
1774 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1775 | select_singlestep_lwp_callback, NULL); | |
1776 | if (event_lp != NULL) | |
1777 | { | |
1778 | if (debug_threads) | |
1779 | fprintf (stderr, | |
1780 | "SEL: Select single-step %s\n", | |
1781 | target_pid_to_str (ptid_of (event_lp))); | |
1782 | } | |
1783 | else | |
1784 | { | |
1785 | /* No single-stepping LWP. Select one at random, out of those | |
1786 | which have had SIGTRAP events. */ | |
1787 | ||
1788 | /* First see how many SIGTRAP events we have. */ | |
1789 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
1790 | ||
1791 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1792 | random_selector = (int) | |
1793 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1794 | ||
1795 | if (debug_threads && num_events > 1) | |
1796 | fprintf (stderr, | |
1797 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1798 | num_events, random_selector); | |
1799 | ||
1800 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
1801 | select_event_lwp_callback, | |
1802 | &random_selector); | |
1803 | } | |
1804 | ||
1805 | if (event_lp != NULL) | |
1806 | { | |
1807 | /* Switch the event LWP. */ | |
1808 | *orig_lp = event_lp; | |
1809 | } | |
1810 | } | |
1811 | ||
7984d532 PA |
1812 | /* Decrement the suspend count of an LWP. */ |
1813 | ||
1814 | static int | |
1815 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
1816 | { | |
1817 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1818 | ||
1819 | /* Ignore EXCEPT. */ | |
1820 | if (lwp == except) | |
1821 | return 0; | |
1822 | ||
1823 | lwp->suspended--; | |
1824 | ||
1825 | gdb_assert (lwp->suspended >= 0); | |
1826 | return 0; | |
1827 | } | |
1828 | ||
1829 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
1830 | NULL. */ | |
1831 | ||
1832 | static void | |
1833 | unsuspend_all_lwps (struct lwp_info *except) | |
1834 | { | |
1835 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
1836 | } | |
1837 | ||
fa593d66 PA |
1838 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
1839 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
1840 | void *data); | |
1841 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
1842 | static ptid_t linux_wait_1 (ptid_t ptid, | |
1843 | struct target_waitstatus *ourstatus, | |
1844 | int target_options); | |
1845 | ||
1846 | /* Stabilize threads (move out of jump pads). | |
1847 | ||
1848 | If a thread is midway collecting a fast tracepoint, we need to | |
1849 | finish the collection and move it out of the jump pad before | |
1850 | reporting the signal. | |
1851 | ||
1852 | This avoids recursion while collecting (when a signal arrives | |
1853 | midway, and the signal handler itself collects), which would trash | |
1854 | the trace buffer. In case the user set a breakpoint in a signal | |
1855 | handler, this avoids the backtrace showing the jump pad, etc.. | |
1856 | Most importantly, there are certain things we can't do safely if | |
1857 | threads are stopped in a jump pad (or in its callee's). For | |
1858 | example: | |
1859 | ||
1860 | - starting a new trace run. A thread still collecting the | |
1861 | previous run, could trash the trace buffer when resumed. The trace | |
1862 | buffer control structures would have been reset but the thread had | |
1863 | no way to tell. The thread could even midway memcpy'ing to the | |
1864 | buffer, which would mean that when resumed, it would clobber the | |
1865 | trace buffer that had been set for a new run. | |
1866 | ||
1867 | - we can't rewrite/reuse the jump pads for new tracepoints | |
1868 | safely. Say you do tstart while a thread is stopped midway while | |
1869 | collecting. When the thread is later resumed, it finishes the | |
1870 | collection, and returns to the jump pad, to execute the original | |
1871 | instruction that was under the tracepoint jump at the time the | |
1872 | older run had been started. If the jump pad had been rewritten | |
1873 | since for something else in the new run, the thread would now | |
1874 | execute the wrong / random instructions. */ | |
1875 | ||
1876 | static void | |
1877 | linux_stabilize_threads (void) | |
1878 | { | |
1879 | struct thread_info *save_inferior; | |
1880 | struct lwp_info *lwp_stuck; | |
1881 | ||
1882 | lwp_stuck | |
1883 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1884 | stuck_in_jump_pad_callback, NULL); | |
1885 | if (lwp_stuck != NULL) | |
1886 | { | |
1887 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
1888 | lwpid_of (lwp_stuck)); | |
1889 | return; | |
1890 | } | |
1891 | ||
1892 | save_inferior = current_inferior; | |
1893 | ||
1894 | stabilizing_threads = 1; | |
1895 | ||
1896 | /* Kick 'em all. */ | |
1897 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
1898 | ||
1899 | /* Loop until all are stopped out of the jump pads. */ | |
1900 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
1901 | { | |
1902 | struct target_waitstatus ourstatus; | |
1903 | struct lwp_info *lwp; | |
1904 | ptid_t ptid; | |
1905 | int wstat; | |
1906 | ||
1907 | /* Note that we go through the full wait even loop. While | |
1908 | moving threads out of jump pad, we need to be able to step | |
1909 | over internal breakpoints and such. */ | |
1910 | ptid = linux_wait_1 (minus_one_ptid, &ourstatus, 0); | |
1911 | ||
1912 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
1913 | { | |
1914 | lwp = get_thread_lwp (current_inferior); | |
1915 | ||
1916 | /* Lock it. */ | |
1917 | lwp->suspended++; | |
1918 | ||
1919 | if (ourstatus.value.sig != TARGET_SIGNAL_0 | |
1920 | || current_inferior->last_resume_kind == resume_stop) | |
1921 | { | |
1922 | wstat = W_STOPCODE (target_signal_to_host (ourstatus.value.sig)); | |
1923 | enqueue_one_deferred_signal (lwp, &wstat); | |
1924 | } | |
1925 | } | |
1926 | } | |
1927 | ||
1928 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
1929 | ||
1930 | stabilizing_threads = 0; | |
1931 | ||
1932 | current_inferior = save_inferior; | |
1933 | ||
1934 | lwp_stuck | |
1935 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1936 | stuck_in_jump_pad_callback, NULL); | |
1937 | if (lwp_stuck != NULL) | |
1938 | { | |
1939 | if (debug_threads) | |
1940 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", | |
1941 | lwpid_of (lwp_stuck)); | |
1942 | } | |
1943 | } | |
1944 | ||
0d62e5e8 | 1945 | /* Wait for process, returns status. */ |
da6d8c04 | 1946 | |
95954743 PA |
1947 | static ptid_t |
1948 | linux_wait_1 (ptid_t ptid, | |
1949 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1950 | { |
e5f1222d | 1951 | int w; |
fc7238bb | 1952 | struct lwp_info *event_child; |
bd99dc85 | 1953 | int options; |
bd99dc85 | 1954 | int pid; |
6bf5e0ba PA |
1955 | int step_over_finished; |
1956 | int bp_explains_trap; | |
1957 | int maybe_internal_trap; | |
1958 | int report_to_gdb; | |
219f2f23 | 1959 | int trace_event; |
bd99dc85 PA |
1960 | |
1961 | /* Translate generic target options into linux options. */ | |
1962 | options = __WALL; | |
1963 | if (target_options & TARGET_WNOHANG) | |
1964 | options |= WNOHANG; | |
0d62e5e8 DJ |
1965 | |
1966 | retry: | |
fa593d66 PA |
1967 | bp_explains_trap = 0; |
1968 | trace_event = 0; | |
bd99dc85 PA |
1969 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1970 | ||
0d62e5e8 DJ |
1971 | /* If we were only supposed to resume one thread, only wait for |
1972 | that thread - if it's still alive. If it died, however - which | |
1973 | can happen if we're coming from the thread death case below - | |
1974 | then we need to make sure we restart the other threads. We could | |
1975 | pick a thread at random or restart all; restarting all is less | |
1976 | arbitrary. */ | |
95954743 PA |
1977 | if (!non_stop |
1978 | && !ptid_equal (cont_thread, null_ptid) | |
1979 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1980 | { |
fc7238bb PA |
1981 | struct thread_info *thread; |
1982 | ||
bd99dc85 PA |
1983 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1984 | cont_thread); | |
0d62e5e8 DJ |
1985 | |
1986 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1987 | if (thread == NULL) |
64386c31 DJ |
1988 | { |
1989 | struct thread_resume resume_info; | |
95954743 | 1990 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1991 | resume_info.kind = resume_continue; |
1992 | resume_info.sig = 0; | |
2bd7c093 | 1993 | linux_resume (&resume_info, 1); |
64386c31 | 1994 | } |
bd99dc85 | 1995 | else |
95954743 | 1996 | ptid = cont_thread; |
0d62e5e8 | 1997 | } |
da6d8c04 | 1998 | |
6bf5e0ba PA |
1999 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2000 | pid = linux_wait_for_event (ptid, &w, options); | |
2001 | else | |
2002 | { | |
2003 | if (debug_threads) | |
2004 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2005 | target_pid_to_str (step_over_bkpt)); | |
2006 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2007 | } | |
2008 | ||
bd99dc85 | 2009 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2010 | return null_ptid; |
bd99dc85 | 2011 | |
6bf5e0ba | 2012 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2013 | |
0d62e5e8 DJ |
2014 | /* If we are waiting for a particular child, and it exited, |
2015 | linux_wait_for_event will return its exit status. Similarly if | |
2016 | the last child exited. If this is not the last child, however, | |
2017 | do not report it as exited until there is a 'thread exited' response | |
2018 | available in the remote protocol. Instead, just wait for another event. | |
2019 | This should be safe, because if the thread crashed we will already | |
2020 | have reported the termination signal to GDB; that should stop any | |
2021 | in-progress stepping operations, etc. | |
2022 | ||
2023 | Report the exit status of the last thread to exit. This matches | |
2024 | LinuxThreads' behavior. */ | |
2025 | ||
95954743 | 2026 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2027 | { |
bd99dc85 | 2028 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2029 | { |
bd99dc85 PA |
2030 | if (WIFEXITED (w)) |
2031 | { | |
2032 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2033 | ourstatus->value.integer = WEXITSTATUS (w); | |
2034 | ||
2035 | if (debug_threads) | |
2036 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
2037 | } | |
2038 | else | |
2039 | { | |
2040 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2041 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
2042 | ||
2043 | if (debug_threads) | |
2044 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
2045 | ||
2046 | } | |
5b1c542e | 2047 | |
3e4c1235 | 2048 | return ptid_of (event_child); |
0d62e5e8 | 2049 | } |
da6d8c04 | 2050 | } |
0d62e5e8 | 2051 | else |
da6d8c04 | 2052 | { |
0d62e5e8 DJ |
2053 | if (!WIFSTOPPED (w)) |
2054 | goto retry; | |
da6d8c04 DJ |
2055 | } |
2056 | ||
6bf5e0ba PA |
2057 | /* If this event was not handled before, and is not a SIGTRAP, we |
2058 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2059 | a breakpoint is inserted at the current PC. If this target does | |
2060 | not support internal breakpoints at all, we also report the | |
2061 | SIGTRAP without further processing; it's of no concern to us. */ | |
2062 | maybe_internal_trap | |
2063 | = (supports_breakpoints () | |
2064 | && (WSTOPSIG (w) == SIGTRAP | |
2065 | || ((WSTOPSIG (w) == SIGILL | |
2066 | || WSTOPSIG (w) == SIGSEGV) | |
2067 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2068 | ||
2069 | if (maybe_internal_trap) | |
2070 | { | |
2071 | /* Handle anything that requires bookkeeping before deciding to | |
2072 | report the event or continue waiting. */ | |
2073 | ||
2074 | /* First check if we can explain the SIGTRAP with an internal | |
2075 | breakpoint, or if we should possibly report the event to GDB. | |
2076 | Do this before anything that may remove or insert a | |
2077 | breakpoint. */ | |
2078 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2079 | ||
2080 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2081 | finished. If so, tweak the state machine accordingly, | |
2082 | reinsert breakpoints and delete any reinsert (software | |
2083 | single-step) breakpoints. */ | |
2084 | step_over_finished = finish_step_over (event_child); | |
2085 | ||
2086 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2087 | check_breakpoints (event_child->stop_pc); | |
2088 | ||
219f2f23 PA |
2089 | /* Handle tracepoint data collecting. This may overflow the |
2090 | trace buffer, and cause a tracing stop, removing | |
2091 | breakpoints. */ | |
2092 | trace_event = handle_tracepoints (event_child); | |
2093 | ||
6bf5e0ba PA |
2094 | if (bp_explains_trap) |
2095 | { | |
2096 | /* If we stepped or ran into an internal breakpoint, we've | |
2097 | already handled it. So next time we resume (from this | |
2098 | PC), we should step over it. */ | |
2099 | if (debug_threads) | |
2100 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2101 | ||
8b07ae33 PA |
2102 | if (breakpoint_here (event_child->stop_pc)) |
2103 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2104 | } |
2105 | } | |
2106 | else | |
2107 | { | |
2108 | /* We have some other signal, possibly a step-over dance was in | |
2109 | progress, and it should be cancelled too. */ | |
2110 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2111 | } |
2112 | ||
2113 | /* We have all the data we need. Either report the event to GDB, or | |
2114 | resume threads and keep waiting for more. */ | |
2115 | ||
2116 | /* If we're collecting a fast tracepoint, finish the collection and | |
2117 | move out of the jump pad before delivering a signal. See | |
2118 | linux_stabilize_threads. */ | |
2119 | ||
2120 | if (WIFSTOPPED (w) | |
2121 | && WSTOPSIG (w) != SIGTRAP | |
2122 | && supports_fast_tracepoints () | |
2123 | && in_process_agent_loaded ()) | |
2124 | { | |
2125 | if (debug_threads) | |
2126 | fprintf (stderr, | |
2127 | "Got signal %d for LWP %ld. Check if we need " | |
2128 | "to defer or adjust it.\n", | |
2129 | WSTOPSIG (w), lwpid_of (event_child)); | |
2130 | ||
2131 | /* Allow debugging the jump pad itself. */ | |
2132 | if (current_inferior->last_resume_kind != resume_step | |
2133 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2134 | { | |
2135 | enqueue_one_deferred_signal (event_child, &w); | |
2136 | ||
2137 | if (debug_threads) | |
2138 | fprintf (stderr, | |
2139 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2140 | WSTOPSIG (w), lwpid_of (event_child)); | |
2141 | ||
2142 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2143 | goto retry; | |
2144 | } | |
2145 | } | |
219f2f23 | 2146 | |
fa593d66 PA |
2147 | if (event_child->collecting_fast_tracepoint) |
2148 | { | |
2149 | if (debug_threads) | |
2150 | fprintf (stderr, "\ | |
2151 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2152 | Check if we're already there.\n", | |
2153 | lwpid_of (event_child), | |
2154 | event_child->collecting_fast_tracepoint); | |
2155 | ||
2156 | trace_event = 1; | |
2157 | ||
2158 | event_child->collecting_fast_tracepoint | |
2159 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2160 | ||
2161 | if (event_child->collecting_fast_tracepoint != 1) | |
2162 | { | |
2163 | /* No longer need this breakpoint. */ | |
2164 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2165 | { | |
2166 | if (debug_threads) | |
2167 | fprintf (stderr, | |
2168 | "No longer need exit-jump-pad bkpt; removing it." | |
2169 | "stopping all threads momentarily.\n"); | |
2170 | ||
2171 | /* Other running threads could hit this breakpoint. | |
2172 | We don't handle moribund locations like GDB does, | |
2173 | instead we always pause all threads when removing | |
2174 | breakpoints, so that any step-over or | |
2175 | decr_pc_after_break adjustment is always taken | |
2176 | care of while the breakpoint is still | |
2177 | inserted. */ | |
2178 | stop_all_lwps (1, event_child); | |
2179 | cancel_breakpoints (); | |
2180 | ||
2181 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2182 | event_child->exit_jump_pad_bkpt = NULL; | |
2183 | ||
2184 | unstop_all_lwps (1, event_child); | |
2185 | ||
2186 | gdb_assert (event_child->suspended >= 0); | |
2187 | } | |
2188 | } | |
2189 | ||
2190 | if (event_child->collecting_fast_tracepoint == 0) | |
2191 | { | |
2192 | if (debug_threads) | |
2193 | fprintf (stderr, | |
2194 | "fast tracepoint finished " | |
2195 | "collecting successfully.\n"); | |
2196 | ||
2197 | /* We may have a deferred signal to report. */ | |
2198 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2199 | { | |
2200 | if (debug_threads) | |
2201 | fprintf (stderr, "dequeued one signal.\n"); | |
2202 | } | |
3c11dd79 | 2203 | else |
fa593d66 | 2204 | { |
3c11dd79 PA |
2205 | if (debug_threads) |
2206 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2207 | |
2208 | if (stabilizing_threads) | |
2209 | { | |
2210 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
2211 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2212 | return ptid_of (event_child); | |
2213 | } | |
2214 | } | |
2215 | } | |
6bf5e0ba PA |
2216 | } |
2217 | ||
e471f25b PA |
2218 | /* Check whether GDB would be interested in this event. */ |
2219 | ||
2220 | /* If GDB is not interested in this signal, don't stop other | |
2221 | threads, and don't report it to GDB. Just resume the inferior | |
2222 | right away. We do this for threading-related signals as well as | |
2223 | any that GDB specifically requested we ignore. But never ignore | |
2224 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2225 | stepping - they may require special handling to skip the signal | |
2226 | handler. */ | |
2227 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2228 | thread library? */ | |
2229 | if (WIFSTOPPED (w) | |
2230 | && current_inferior->last_resume_kind != resume_step | |
2231 | && ( | |
2232 | #if defined (USE_THREAD_DB) && defined (__SIGRTMIN) | |
2233 | (current_process ()->private->thread_db != NULL | |
2234 | && (WSTOPSIG (w) == __SIGRTMIN | |
2235 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2236 | || | |
2237 | #endif | |
2238 | (pass_signals[target_signal_from_host (WSTOPSIG (w))] | |
2239 | && !(WSTOPSIG (w) == SIGSTOP | |
2240 | && current_inferior->last_resume_kind == resume_stop)))) | |
2241 | { | |
2242 | siginfo_t info, *info_p; | |
2243 | ||
2244 | if (debug_threads) | |
2245 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2246 | WSTOPSIG (w), lwpid_of (event_child)); | |
2247 | ||
2248 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) | |
2249 | info_p = &info; | |
2250 | else | |
2251 | info_p = NULL; | |
2252 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2253 | WSTOPSIG (w), info_p); | |
2254 | goto retry; | |
2255 | } | |
2256 | ||
2257 | /* If GDB wanted this thread to single step, we always want to | |
2258 | report the SIGTRAP, and let GDB handle it. Watchpoints should | |
2259 | always be reported. So should signals we can't explain. A | |
2260 | SIGTRAP we can't explain could be a GDB breakpoint --- we may or | |
2261 | not support Z0 breakpoints. If we do, we're be able to handle | |
2262 | GDB breakpoints on top of internal breakpoints, by handling the | |
2263 | internal breakpoint and still reporting the event to GDB. If we | |
2264 | don't, we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 2265 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 2266 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 2267 | || event_child->stopped_by_watchpoint |
219f2f23 | 2268 | || (!step_over_finished && !bp_explains_trap && !trace_event) |
8b07ae33 | 2269 | || gdb_breakpoint_here (event_child->stop_pc)); |
6bf5e0ba PA |
2270 | |
2271 | /* We found no reason GDB would want us to stop. We either hit one | |
2272 | of our own breakpoints, or finished an internal step GDB | |
2273 | shouldn't know about. */ | |
2274 | if (!report_to_gdb) | |
2275 | { | |
2276 | if (debug_threads) | |
2277 | { | |
2278 | if (bp_explains_trap) | |
2279 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2280 | if (step_over_finished) | |
2281 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2282 | if (trace_event) |
2283 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
2284 | } |
2285 | ||
2286 | /* We're not reporting this breakpoint to GDB, so apply the | |
2287 | decr_pc_after_break adjustment to the inferior's regcache | |
2288 | ourselves. */ | |
2289 | ||
2290 | if (the_low_target.set_pc != NULL) | |
2291 | { | |
2292 | struct regcache *regcache | |
2293 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2294 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2295 | } | |
2296 | ||
7984d532 PA |
2297 | /* We may have finished stepping over a breakpoint. If so, |
2298 | we've stopped and suspended all LWPs momentarily except the | |
2299 | stepping one. This is where we resume them all again. We're | |
2300 | going to keep waiting, so use proceed, which handles stepping | |
2301 | over the next breakpoint. */ | |
6bf5e0ba PA |
2302 | if (debug_threads) |
2303 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2304 | |
2305 | if (step_over_finished) | |
2306 | unsuspend_all_lwps (event_child); | |
2307 | ||
6bf5e0ba PA |
2308 | proceed_all_lwps (); |
2309 | goto retry; | |
2310 | } | |
2311 | ||
2312 | if (debug_threads) | |
2313 | { | |
8336d594 | 2314 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
2315 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
2316 | if (event_child->stopped_by_watchpoint) | |
2317 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2318 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2319 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2320 | if (debug_threads) |
2321 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2322 | } | |
2323 | ||
2324 | /* Alright, we're going to report a stop. */ | |
2325 | ||
fa593d66 | 2326 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2327 | { |
2328 | /* In all-stop, stop all threads. */ | |
7984d532 | 2329 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2330 | |
2331 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2332 | from among those that have had events. Giving equal priority | |
2333 | to all LWPs that have had events helps prevent | |
2334 | starvation. */ | |
2335 | if (ptid_equal (ptid, minus_one_ptid)) | |
2336 | { | |
2337 | event_child->status_pending_p = 1; | |
2338 | event_child->status_pending = w; | |
2339 | ||
2340 | select_event_lwp (&event_child); | |
2341 | ||
2342 | event_child->status_pending_p = 0; | |
2343 | w = event_child->status_pending; | |
2344 | } | |
2345 | ||
2346 | /* Now that we've selected our final event LWP, cancel any | |
2347 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2348 | See the comment in cancel_breakpoints_callback to find out | |
2349 | why. */ | |
2350 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 PA |
2351 | |
2352 | /* Stabilize threads (move out of jump pads). */ | |
2353 | stabilize_threads (); | |
6bf5e0ba PA |
2354 | } |
2355 | else | |
2356 | { | |
2357 | /* If we just finished a step-over, then all threads had been | |
2358 | momentarily paused. In all-stop, that's fine, we want | |
2359 | threads stopped by now anyway. In non-stop, we need to | |
2360 | re-resume threads that GDB wanted to be running. */ | |
2361 | if (step_over_finished) | |
7984d532 | 2362 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2363 | } |
2364 | ||
5b1c542e | 2365 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2366 | |
8336d594 PA |
2367 | if (current_inferior->last_resume_kind == resume_stop |
2368 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2369 | { |
2370 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2371 | and it stopped cleanly, so report as SIG0. The use of | |
2372 | SIGSTOP is an implementation detail. */ | |
2373 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2374 | } | |
8336d594 PA |
2375 | else if (current_inferior->last_resume_kind == resume_stop |
2376 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2377 | { |
2378 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2379 | but, it stopped for other reasons. */ |
bd99dc85 PA |
2380 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
2381 | } | |
2382 | else | |
2383 | { | |
2384 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
2385 | } | |
2386 | ||
d50171e4 PA |
2387 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2388 | ||
bd99dc85 | 2389 | if (debug_threads) |
95954743 | 2390 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2391 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2392 | ourstatus->kind, |
2393 | ourstatus->value.sig); | |
2394 | ||
6bf5e0ba | 2395 | return ptid_of (event_child); |
bd99dc85 PA |
2396 | } |
2397 | ||
2398 | /* Get rid of any pending event in the pipe. */ | |
2399 | static void | |
2400 | async_file_flush (void) | |
2401 | { | |
2402 | int ret; | |
2403 | char buf; | |
2404 | ||
2405 | do | |
2406 | ret = read (linux_event_pipe[0], &buf, 1); | |
2407 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2408 | } | |
2409 | ||
2410 | /* Put something in the pipe, so the event loop wakes up. */ | |
2411 | static void | |
2412 | async_file_mark (void) | |
2413 | { | |
2414 | int ret; | |
2415 | ||
2416 | async_file_flush (); | |
2417 | ||
2418 | do | |
2419 | ret = write (linux_event_pipe[1], "+", 1); | |
2420 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2421 | ||
2422 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2423 | be awakened anyway. */ | |
2424 | } | |
2425 | ||
95954743 PA |
2426 | static ptid_t |
2427 | linux_wait (ptid_t ptid, | |
2428 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2429 | { |
95954743 | 2430 | ptid_t event_ptid; |
bd99dc85 PA |
2431 | |
2432 | if (debug_threads) | |
95954743 | 2433 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2434 | |
2435 | /* Flush the async file first. */ | |
2436 | if (target_is_async_p ()) | |
2437 | async_file_flush (); | |
2438 | ||
95954743 | 2439 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2440 | |
2441 | /* If at least one stop was reported, there may be more. A single | |
2442 | SIGCHLD can signal more than one child stop. */ | |
2443 | if (target_is_async_p () | |
2444 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2445 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2446 | async_file_mark (); |
2447 | ||
2448 | return event_ptid; | |
da6d8c04 DJ |
2449 | } |
2450 | ||
c5f62d5f | 2451 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2452 | |
2453 | static int | |
a1928bad | 2454 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2455 | { |
c5f62d5f DE |
2456 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2457 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2458 | |
c5f62d5f DE |
2459 | #ifdef __NR_tkill |
2460 | { | |
2461 | static int tkill_failed; | |
fd500816 | 2462 | |
c5f62d5f DE |
2463 | if (!tkill_failed) |
2464 | { | |
2465 | int ret; | |
2466 | ||
2467 | errno = 0; | |
2468 | ret = syscall (__NR_tkill, lwpid, signo); | |
2469 | if (errno != ENOSYS) | |
2470 | return ret; | |
2471 | tkill_failed = 1; | |
2472 | } | |
2473 | } | |
fd500816 DJ |
2474 | #endif |
2475 | ||
2476 | return kill (lwpid, signo); | |
2477 | } | |
2478 | ||
964e4306 PA |
2479 | void |
2480 | linux_stop_lwp (struct lwp_info *lwp) | |
2481 | { | |
2482 | send_sigstop (lwp); | |
2483 | } | |
2484 | ||
0d62e5e8 | 2485 | static void |
02fc4de7 | 2486 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2487 | { |
bd99dc85 | 2488 | int pid; |
0d62e5e8 | 2489 | |
bd99dc85 PA |
2490 | pid = lwpid_of (lwp); |
2491 | ||
0d62e5e8 DJ |
2492 | /* If we already have a pending stop signal for this process, don't |
2493 | send another. */ | |
54a0b537 | 2494 | if (lwp->stop_expected) |
0d62e5e8 | 2495 | { |
ae13219e | 2496 | if (debug_threads) |
bd99dc85 | 2497 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2498 | |
0d62e5e8 DJ |
2499 | return; |
2500 | } | |
2501 | ||
2502 | if (debug_threads) | |
bd99dc85 | 2503 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2504 | |
d50171e4 | 2505 | lwp->stop_expected = 1; |
bd99dc85 | 2506 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2507 | } |
2508 | ||
7984d532 PA |
2509 | static int |
2510 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2511 | { |
2512 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2513 | ||
7984d532 PA |
2514 | /* Ignore EXCEPT. */ |
2515 | if (lwp == except) | |
2516 | return 0; | |
2517 | ||
02fc4de7 | 2518 | if (lwp->stopped) |
7984d532 | 2519 | return 0; |
02fc4de7 PA |
2520 | |
2521 | send_sigstop (lwp); | |
7984d532 PA |
2522 | return 0; |
2523 | } | |
2524 | ||
2525 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2526 | yet. */ | |
2527 | static int | |
2528 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2529 | void *except) | |
2530 | { | |
2531 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2532 | ||
2533 | /* Ignore EXCEPT. */ | |
2534 | if (lwp == except) | |
2535 | return 0; | |
2536 | ||
2537 | lwp->suspended++; | |
2538 | ||
2539 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2540 | } |
2541 | ||
95954743 PA |
2542 | static void |
2543 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2544 | { | |
2545 | /* It's dead, really. */ | |
2546 | lwp->dead = 1; | |
2547 | ||
2548 | /* Store the exit status for later. */ | |
2549 | lwp->status_pending_p = 1; | |
2550 | lwp->status_pending = wstat; | |
2551 | ||
95954743 PA |
2552 | /* Prevent trying to stop it. */ |
2553 | lwp->stopped = 1; | |
2554 | ||
2555 | /* No further stops are expected from a dead lwp. */ | |
2556 | lwp->stop_expected = 0; | |
2557 | } | |
2558 | ||
0d62e5e8 DJ |
2559 | static void |
2560 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2561 | { | |
54a0b537 | 2562 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2563 | struct thread_info *saved_inferior; |
a1928bad | 2564 | int wstat; |
95954743 PA |
2565 | ptid_t saved_tid; |
2566 | ptid_t ptid; | |
d50171e4 | 2567 | int pid; |
0d62e5e8 | 2568 | |
54a0b537 | 2569 | if (lwp->stopped) |
d50171e4 PA |
2570 | { |
2571 | if (debug_threads) | |
2572 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2573 | lwpid_of (lwp)); | |
2574 | return; | |
2575 | } | |
0d62e5e8 DJ |
2576 | |
2577 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2578 | if (saved_inferior != NULL) |
2579 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2580 | else | |
95954743 | 2581 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2582 | |
95954743 | 2583 | ptid = lwp->head.id; |
bd99dc85 | 2584 | |
d50171e4 PA |
2585 | if (debug_threads) |
2586 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2587 | ||
2588 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2589 | |
2590 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2591 | and record the pending SIGSTOP. If the process exited, just | |
2592 | return. */ | |
d50171e4 | 2593 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2594 | { |
2595 | if (debug_threads) | |
d50171e4 PA |
2596 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2597 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2598 | |
d50171e4 | 2599 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2600 | { |
2601 | if (debug_threads) | |
d50171e4 PA |
2602 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2603 | lwpid_of (lwp), wstat); | |
2604 | ||
c35fafde PA |
2605 | lwp->status_pending_p = 1; |
2606 | lwp->status_pending = wstat; | |
2607 | } | |
0d62e5e8 | 2608 | } |
d50171e4 | 2609 | else |
95954743 PA |
2610 | { |
2611 | if (debug_threads) | |
d50171e4 | 2612 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2613 | |
d50171e4 PA |
2614 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2615 | if (lwp) | |
2616 | { | |
2617 | /* Leave this status pending for the next time we're able to | |
2618 | report it. In the mean time, we'll report this lwp as | |
2619 | dead to GDB, so GDB doesn't try to read registers and | |
2620 | memory from it. This can only happen if this was the | |
2621 | last thread of the process; otherwise, PID is removed | |
2622 | from the thread tables before linux_wait_for_event | |
2623 | returns. */ | |
2624 | mark_lwp_dead (lwp, wstat); | |
2625 | } | |
95954743 | 2626 | } |
0d62e5e8 | 2627 | |
bd99dc85 | 2628 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2629 | current_inferior = saved_inferior; |
2630 | else | |
2631 | { | |
2632 | if (debug_threads) | |
2633 | fprintf (stderr, "Previously current thread died.\n"); | |
2634 | ||
bd99dc85 PA |
2635 | if (non_stop) |
2636 | { | |
2637 | /* We can't change the current inferior behind GDB's back, | |
2638 | otherwise, a subsequent command may apply to the wrong | |
2639 | process. */ | |
2640 | current_inferior = NULL; | |
2641 | } | |
2642 | else | |
2643 | { | |
2644 | /* Set a valid thread as current. */ | |
2645 | set_desired_inferior (0); | |
2646 | } | |
0d62e5e8 DJ |
2647 | } |
2648 | } | |
2649 | ||
fa593d66 PA |
2650 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
2651 | move it out, because we need to report the stop event to GDB. For | |
2652 | example, if the user puts a breakpoint in the jump pad, it's | |
2653 | because she wants to debug it. */ | |
2654 | ||
2655 | static int | |
2656 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
2657 | { | |
2658 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2659 | struct thread_info *thread = get_lwp_thread (lwp); | |
2660 | ||
2661 | gdb_assert (lwp->suspended == 0); | |
2662 | gdb_assert (lwp->stopped); | |
2663 | ||
2664 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
2665 | return (supports_fast_tracepoints () | |
2666 | && in_process_agent_loaded () | |
2667 | && (gdb_breakpoint_here (lwp->stop_pc) | |
2668 | || lwp->stopped_by_watchpoint | |
2669 | || thread->last_resume_kind == resume_step) | |
2670 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
2671 | } | |
2672 | ||
2673 | static void | |
2674 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
2675 | { | |
2676 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2677 | struct thread_info *thread = get_lwp_thread (lwp); | |
2678 | int *wstat; | |
2679 | ||
2680 | gdb_assert (lwp->suspended == 0); | |
2681 | gdb_assert (lwp->stopped); | |
2682 | ||
2683 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
2684 | ||
2685 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
2686 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
2687 | && !lwp->stopped_by_watchpoint | |
2688 | && thread->last_resume_kind != resume_step | |
2689 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
2690 | { | |
2691 | if (debug_threads) | |
2692 | fprintf (stderr, | |
2693 | "LWP %ld needs stabilizing (in jump pad)\n", | |
2694 | lwpid_of (lwp)); | |
2695 | ||
2696 | if (wstat) | |
2697 | { | |
2698 | lwp->status_pending_p = 0; | |
2699 | enqueue_one_deferred_signal (lwp, wstat); | |
2700 | ||
2701 | if (debug_threads) | |
2702 | fprintf (stderr, | |
2703 | "Signal %d for LWP %ld deferred " | |
2704 | "(in jump pad)\n", | |
2705 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
2706 | } | |
2707 | ||
2708 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
2709 | } | |
2710 | else | |
2711 | lwp->suspended++; | |
2712 | } | |
2713 | ||
2714 | static int | |
2715 | lwp_running (struct inferior_list_entry *entry, void *data) | |
2716 | { | |
2717 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2718 | ||
2719 | if (lwp->dead) | |
2720 | return 0; | |
2721 | if (lwp->stopped) | |
2722 | return 0; | |
2723 | return 1; | |
2724 | } | |
2725 | ||
7984d532 PA |
2726 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
2727 | If SUSPEND, then also increase the suspend count of every LWP, | |
2728 | except EXCEPT. */ | |
2729 | ||
0d62e5e8 | 2730 | static void |
7984d532 | 2731 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 DJ |
2732 | { |
2733 | stopping_threads = 1; | |
7984d532 PA |
2734 | |
2735 | if (suspend) | |
2736 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
2737 | else | |
2738 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 2739 | for_each_inferior (&all_lwps, wait_for_sigstop); |
0d62e5e8 DJ |
2740 | stopping_threads = 0; |
2741 | } | |
2742 | ||
da6d8c04 DJ |
2743 | /* Resume execution of the inferior process. |
2744 | If STEP is nonzero, single-step it. | |
2745 | If SIGNAL is nonzero, give it that signal. */ | |
2746 | ||
ce3a066d | 2747 | static void |
2acc282a | 2748 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 2749 | int step, int signal, siginfo_t *info) |
da6d8c04 | 2750 | { |
0d62e5e8 | 2751 | struct thread_info *saved_inferior; |
fa593d66 | 2752 | int fast_tp_collecting; |
0d62e5e8 | 2753 | |
54a0b537 | 2754 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
2755 | return; |
2756 | ||
fa593d66 PA |
2757 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
2758 | ||
2759 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
2760 | ||
219f2f23 PA |
2761 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
2762 | user used the "jump" command, or "set $pc = foo"). */ | |
2763 | if (lwp->stop_pc != get_pc (lwp)) | |
2764 | { | |
2765 | /* Collecting 'while-stepping' actions doesn't make sense | |
2766 | anymore. */ | |
2767 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
2768 | } | |
2769 | ||
0d62e5e8 DJ |
2770 | /* If we have pending signals or status, and a new signal, enqueue the |
2771 | signal. Also enqueue the signal if we are waiting to reinsert a | |
2772 | breakpoint; it will be picked up again below. */ | |
2773 | if (signal != 0 | |
fa593d66 PA |
2774 | && (lwp->status_pending_p |
2775 | || lwp->pending_signals != NULL | |
2776 | || lwp->bp_reinsert != 0 | |
2777 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
2778 | { |
2779 | struct pending_signals *p_sig; | |
bca929d3 | 2780 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 2781 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 2782 | p_sig->signal = signal; |
32ca6d61 DJ |
2783 | if (info == NULL) |
2784 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2785 | else | |
2786 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 2787 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
2788 | } |
2789 | ||
d50171e4 PA |
2790 | if (lwp->status_pending_p) |
2791 | { | |
2792 | if (debug_threads) | |
2793 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
2794 | " has pending status\n", | |
2795 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
2796 | lwp->stop_expected ? "expected" : "not expected"); | |
2797 | return; | |
2798 | } | |
0d62e5e8 DJ |
2799 | |
2800 | saved_inferior = current_inferior; | |
54a0b537 | 2801 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
2802 | |
2803 | if (debug_threads) | |
1b3f6016 | 2804 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 2805 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 2806 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
2807 | |
2808 | /* This bit needs some thinking about. If we get a signal that | |
2809 | we must report while a single-step reinsert is still pending, | |
2810 | we often end up resuming the thread. It might be better to | |
2811 | (ew) allow a stack of pending events; then we could be sure that | |
2812 | the reinsert happened right away and not lose any signals. | |
2813 | ||
2814 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 2815 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
2816 | complete correctness, so it won't solve that problem. It may be |
2817 | worthwhile just to solve this one, however. */ | |
54a0b537 | 2818 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
2819 | { |
2820 | if (debug_threads) | |
d50171e4 PA |
2821 | fprintf (stderr, " pending reinsert at 0x%s\n", |
2822 | paddress (lwp->bp_reinsert)); | |
2823 | ||
2824 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
2825 | { | |
fa593d66 PA |
2826 | if (fast_tp_collecting == 0) |
2827 | { | |
2828 | if (step == 0) | |
2829 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
2830 | if (lwp->suspended) | |
2831 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
2832 | lwp->suspended); | |
2833 | } | |
d50171e4 PA |
2834 | |
2835 | step = 1; | |
2836 | } | |
0d62e5e8 DJ |
2837 | |
2838 | /* Postpone any pending signal. It was enqueued above. */ | |
2839 | signal = 0; | |
2840 | } | |
2841 | ||
fa593d66 PA |
2842 | if (fast_tp_collecting == 1) |
2843 | { | |
2844 | if (debug_threads) | |
2845 | fprintf (stderr, "\ | |
2846 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
2847 | lwpid_of (lwp)); | |
2848 | ||
2849 | /* Postpone any pending signal. It was enqueued above. */ | |
2850 | signal = 0; | |
2851 | } | |
2852 | else if (fast_tp_collecting == 2) | |
2853 | { | |
2854 | if (debug_threads) | |
2855 | fprintf (stderr, "\ | |
2856 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
2857 | lwpid_of (lwp)); | |
2858 | ||
2859 | if (can_hardware_single_step ()) | |
2860 | step = 1; | |
2861 | else | |
2862 | fatal ("moving out of jump pad single-stepping" | |
2863 | " not implemented on this target"); | |
2864 | ||
2865 | /* Postpone any pending signal. It was enqueued above. */ | |
2866 | signal = 0; | |
2867 | } | |
2868 | ||
219f2f23 PA |
2869 | /* If we have while-stepping actions in this thread set it stepping. |
2870 | If we have a signal to deliver, it may or may not be set to | |
2871 | SIG_IGN, we don't know. Assume so, and allow collecting | |
2872 | while-stepping into a signal handler. A possible smart thing to | |
2873 | do would be to set an internal breakpoint at the signal return | |
2874 | address, continue, and carry on catching this while-stepping | |
2875 | action only when that breakpoint is hit. A future | |
2876 | enhancement. */ | |
2877 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
2878 | && can_hardware_single_step ()) | |
2879 | { | |
2880 | if (debug_threads) | |
2881 | fprintf (stderr, | |
2882 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
2883 | lwpid_of (lwp)); | |
2884 | step = 1; | |
2885 | } | |
2886 | ||
aa691b87 | 2887 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 2888 | { |
442ea881 PA |
2889 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
2890 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 2891 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
2892 | } |
2893 | ||
fa593d66 PA |
2894 | /* If we have pending signals, consume one unless we are trying to |
2895 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
2896 | collect. */ | |
2897 | if (lwp->pending_signals != NULL | |
2898 | && lwp->bp_reinsert == 0 | |
2899 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
2900 | { |
2901 | struct pending_signals **p_sig; | |
2902 | ||
54a0b537 | 2903 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
2904 | while ((*p_sig)->prev != NULL) |
2905 | p_sig = &(*p_sig)->prev; | |
2906 | ||
2907 | signal = (*p_sig)->signal; | |
32ca6d61 | 2908 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 2909 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 2910 | |
0d62e5e8 DJ |
2911 | free (*p_sig); |
2912 | *p_sig = NULL; | |
2913 | } | |
2914 | ||
aa5ca48f DE |
2915 | if (the_low_target.prepare_to_resume != NULL) |
2916 | the_low_target.prepare_to_resume (lwp); | |
2917 | ||
0d62e5e8 | 2918 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 2919 | get_lwp_thread (lwp)); |
da6d8c04 | 2920 | errno = 0; |
54a0b537 | 2921 | lwp->stopped = 0; |
c3adc08c | 2922 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 2923 | lwp->stepping = step; |
14ce3065 DE |
2924 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
2925 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2926 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2927 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
2928 | |
2929 | current_inferior = saved_inferior; | |
da6d8c04 | 2930 | if (errno) |
3221518c UW |
2931 | { |
2932 | /* ESRCH from ptrace either means that the thread was already | |
2933 | running (an error) or that it is gone (a race condition). If | |
2934 | it's gone, we will get a notification the next time we wait, | |
2935 | so we can ignore the error. We could differentiate these | |
2936 | two, but it's tricky without waiting; the thread still exists | |
2937 | as a zombie, so sending it signal 0 would succeed. So just | |
2938 | ignore ESRCH. */ | |
2939 | if (errno == ESRCH) | |
2940 | return; | |
2941 | ||
2942 | perror_with_name ("ptrace"); | |
2943 | } | |
da6d8c04 DJ |
2944 | } |
2945 | ||
2bd7c093 PA |
2946 | struct thread_resume_array |
2947 | { | |
2948 | struct thread_resume *resume; | |
2949 | size_t n; | |
2950 | }; | |
64386c31 DJ |
2951 | |
2952 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
2953 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
2954 | resume request. | |
2955 | ||
2956 | This algorithm is O(threads * resume elements), but resume elements | |
2957 | is small (and will remain small at least until GDB supports thread | |
2958 | suspension). */ | |
2bd7c093 PA |
2959 | static int |
2960 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 2961 | { |
54a0b537 | 2962 | struct lwp_info *lwp; |
64386c31 | 2963 | struct thread_info *thread; |
5544ad89 | 2964 | int ndx; |
2bd7c093 | 2965 | struct thread_resume_array *r; |
64386c31 DJ |
2966 | |
2967 | thread = (struct thread_info *) entry; | |
54a0b537 | 2968 | lwp = get_thread_lwp (thread); |
2bd7c093 | 2969 | r = arg; |
64386c31 | 2970 | |
2bd7c093 | 2971 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
2972 | { |
2973 | ptid_t ptid = r->resume[ndx].thread; | |
2974 | if (ptid_equal (ptid, minus_one_ptid) | |
2975 | || ptid_equal (ptid, entry->id) | |
2976 | || (ptid_is_pid (ptid) | |
2977 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
2978 | || (ptid_get_lwp (ptid) == -1 | |
2979 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
2980 | { | |
d50171e4 | 2981 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 2982 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
2983 | { |
2984 | if (debug_threads) | |
2985 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
2986 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
2987 | ? "stopped" | |
2988 | : "stopping", | |
2989 | lwpid_of (lwp)); | |
2990 | ||
2991 | continue; | |
2992 | } | |
2993 | ||
95954743 | 2994 | lwp->resume = &r->resume[ndx]; |
8336d594 | 2995 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 PA |
2996 | |
2997 | /* If we had a deferred signal to report, dequeue one now. | |
2998 | This can happen if LWP gets more than one signal while | |
2999 | trying to get out of a jump pad. */ | |
3000 | if (lwp->stopped | |
3001 | && !lwp->status_pending_p | |
3002 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3003 | { | |
3004 | lwp->status_pending_p = 1; | |
3005 | ||
3006 | if (debug_threads) | |
3007 | fprintf (stderr, | |
3008 | "Dequeueing deferred signal %d for LWP %ld, " | |
3009 | "leaving status pending.\n", | |
3010 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3011 | } | |
3012 | ||
95954743 PA |
3013 | return 0; |
3014 | } | |
3015 | } | |
2bd7c093 PA |
3016 | |
3017 | /* No resume action for this thread. */ | |
3018 | lwp->resume = NULL; | |
64386c31 | 3019 | |
2bd7c093 | 3020 | return 0; |
5544ad89 DJ |
3021 | } |
3022 | ||
5544ad89 | 3023 | |
bd99dc85 PA |
3024 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3025 | static int | |
3026 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3027 | { |
bd99dc85 | 3028 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3029 | |
bd99dc85 PA |
3030 | /* LWPs which will not be resumed are not interesting, because |
3031 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3032 | if (lwp->resume == NULL) |
bd99dc85 | 3033 | return 0; |
64386c31 | 3034 | |
bd99dc85 | 3035 | if (lwp->status_pending_p) |
d50171e4 PA |
3036 | * (int *) flag_p = 1; |
3037 | ||
3038 | return 0; | |
3039 | } | |
3040 | ||
3041 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3042 | internal breakpoint that we need to step over. It assumes that any | |
3043 | required STOP_PC adjustment has already been propagated to the | |
3044 | inferior's regcache. */ | |
3045 | ||
3046 | static int | |
3047 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3048 | { | |
3049 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3050 | struct thread_info *thread; |
d50171e4 PA |
3051 | struct thread_info *saved_inferior; |
3052 | CORE_ADDR pc; | |
3053 | ||
3054 | /* LWPs which will not be resumed are not interesting, because we | |
3055 | might not wait for them next time through linux_wait. */ | |
3056 | ||
3057 | if (!lwp->stopped) | |
3058 | { | |
3059 | if (debug_threads) | |
3060 | fprintf (stderr, | |
3061 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3062 | lwpid_of (lwp)); | |
3063 | return 0; | |
3064 | } | |
3065 | ||
8336d594 PA |
3066 | thread = get_lwp_thread (lwp); |
3067 | ||
3068 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3069 | { |
3070 | if (debug_threads) | |
3071 | fprintf (stderr, | |
3072 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3073 | lwpid_of (lwp)); | |
3074 | return 0; | |
3075 | } | |
3076 | ||
7984d532 PA |
3077 | gdb_assert (lwp->suspended >= 0); |
3078 | ||
3079 | if (lwp->suspended) | |
3080 | { | |
3081 | if (debug_threads) | |
3082 | fprintf (stderr, | |
3083 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3084 | lwpid_of (lwp)); | |
3085 | return 0; | |
3086 | } | |
3087 | ||
d50171e4 PA |
3088 | if (!lwp->need_step_over) |
3089 | { | |
3090 | if (debug_threads) | |
3091 | fprintf (stderr, | |
3092 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3093 | } | |
5544ad89 | 3094 | |
bd99dc85 | 3095 | if (lwp->status_pending_p) |
d50171e4 PA |
3096 | { |
3097 | if (debug_threads) | |
3098 | fprintf (stderr, | |
3099 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3100 | lwpid_of (lwp)); | |
3101 | return 0; | |
3102 | } | |
3103 | ||
3104 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3105 | or we have. */ | |
3106 | pc = get_pc (lwp); | |
3107 | ||
3108 | /* If the PC has changed since we stopped, then don't do anything, | |
3109 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3110 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3111 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3112 | command, or poked thread's registers herself. */ | |
3113 | if (pc != lwp->stop_pc) | |
3114 | { | |
3115 | if (debug_threads) | |
3116 | fprintf (stderr, | |
3117 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3118 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3119 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3120 | ||
3121 | lwp->need_step_over = 0; | |
3122 | return 0; | |
3123 | } | |
3124 | ||
3125 | saved_inferior = current_inferior; | |
8336d594 | 3126 | current_inferior = thread; |
d50171e4 | 3127 | |
8b07ae33 | 3128 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3129 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3130 | { |
8b07ae33 PA |
3131 | /* Don't step over a breakpoint that GDB expects to hit |
3132 | though. */ | |
3133 | if (gdb_breakpoint_here (pc)) | |
3134 | { | |
3135 | if (debug_threads) | |
3136 | fprintf (stderr, | |
3137 | "Need step over [LWP %ld]? yes, but found" | |
3138 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3139 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3140 | |
8b07ae33 PA |
3141 | current_inferior = saved_inferior; |
3142 | return 0; | |
3143 | } | |
3144 | else | |
3145 | { | |
3146 | if (debug_threads) | |
3147 | fprintf (stderr, | |
3148 | "Need step over [LWP %ld]? yes, found breakpoint at 0x%s\n", | |
3149 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3150 | |
8b07ae33 PA |
3151 | /* We've found an lwp that needs stepping over --- return 1 so |
3152 | that find_inferior stops looking. */ | |
3153 | current_inferior = saved_inferior; | |
3154 | ||
3155 | /* If the step over is cancelled, this is set again. */ | |
3156 | lwp->need_step_over = 0; | |
3157 | return 1; | |
3158 | } | |
d50171e4 PA |
3159 | } |
3160 | ||
3161 | current_inferior = saved_inferior; | |
3162 | ||
3163 | if (debug_threads) | |
3164 | fprintf (stderr, | |
3165 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3166 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3167 | |
bd99dc85 | 3168 | return 0; |
5544ad89 DJ |
3169 | } |
3170 | ||
d50171e4 PA |
3171 | /* Start a step-over operation on LWP. When LWP stopped at a |
3172 | breakpoint, to make progress, we need to remove the breakpoint out | |
3173 | of the way. If we let other threads run while we do that, they may | |
3174 | pass by the breakpoint location and miss hitting it. To avoid | |
3175 | that, a step-over momentarily stops all threads while LWP is | |
3176 | single-stepped while the breakpoint is temporarily uninserted from | |
3177 | the inferior. When the single-step finishes, we reinsert the | |
3178 | breakpoint, and let all threads that are supposed to be running, | |
3179 | run again. | |
3180 | ||
3181 | On targets that don't support hardware single-step, we don't | |
3182 | currently support full software single-stepping. Instead, we only | |
3183 | support stepping over the thread event breakpoint, by asking the | |
3184 | low target where to place a reinsert breakpoint. Since this | |
3185 | routine assumes the breakpoint being stepped over is a thread event | |
3186 | breakpoint, it usually assumes the return address of the current | |
3187 | function is a good enough place to set the reinsert breakpoint. */ | |
3188 | ||
3189 | static int | |
3190 | start_step_over (struct lwp_info *lwp) | |
3191 | { | |
3192 | struct thread_info *saved_inferior; | |
3193 | CORE_ADDR pc; | |
3194 | int step; | |
3195 | ||
3196 | if (debug_threads) | |
3197 | fprintf (stderr, | |
3198 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3199 | lwpid_of (lwp)); | |
3200 | ||
7984d532 PA |
3201 | stop_all_lwps (1, lwp); |
3202 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3203 | |
3204 | if (debug_threads) | |
3205 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3206 | ||
3207 | /* Note, we should always reach here with an already adjusted PC, | |
3208 | either by GDB (if we're resuming due to GDB's request), or by our | |
3209 | caller, if we just finished handling an internal breakpoint GDB | |
3210 | shouldn't care about. */ | |
3211 | pc = get_pc (lwp); | |
3212 | ||
3213 | saved_inferior = current_inferior; | |
3214 | current_inferior = get_lwp_thread (lwp); | |
3215 | ||
3216 | lwp->bp_reinsert = pc; | |
3217 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3218 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3219 | |
3220 | if (can_hardware_single_step ()) | |
3221 | { | |
3222 | step = 1; | |
3223 | } | |
3224 | else | |
3225 | { | |
3226 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3227 | set_reinsert_breakpoint (raddr); | |
3228 | step = 0; | |
3229 | } | |
3230 | ||
3231 | current_inferior = saved_inferior; | |
3232 | ||
3233 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3234 | ||
3235 | /* Require next event from this LWP. */ | |
3236 | step_over_bkpt = lwp->head.id; | |
3237 | return 1; | |
3238 | } | |
3239 | ||
3240 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3241 | start_step_over, if still there, and delete any reinsert | |
3242 | breakpoints we've set, on non hardware single-step targets. */ | |
3243 | ||
3244 | static int | |
3245 | finish_step_over (struct lwp_info *lwp) | |
3246 | { | |
3247 | if (lwp->bp_reinsert != 0) | |
3248 | { | |
3249 | if (debug_threads) | |
3250 | fprintf (stderr, "Finished step over.\n"); | |
3251 | ||
3252 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3253 | may be no breakpoint to reinsert there by now. */ | |
3254 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3255 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3256 | |
3257 | lwp->bp_reinsert = 0; | |
3258 | ||
3259 | /* Delete any software-single-step reinsert breakpoints. No | |
3260 | longer needed. We don't have to worry about other threads | |
3261 | hitting this trap, and later not being able to explain it, | |
3262 | because we were stepping over a breakpoint, and we hold all | |
3263 | threads but LWP stopped while doing that. */ | |
3264 | if (!can_hardware_single_step ()) | |
3265 | delete_reinsert_breakpoints (); | |
3266 | ||
3267 | step_over_bkpt = null_ptid; | |
3268 | return 1; | |
3269 | } | |
3270 | else | |
3271 | return 0; | |
3272 | } | |
3273 | ||
5544ad89 DJ |
3274 | /* This function is called once per thread. We check the thread's resume |
3275 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3276 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3277 | |
bd99dc85 PA |
3278 | For threads which we aren't explicitly told otherwise, we preserve |
3279 | the stepping flag; this is used for stepping over gdbserver-placed | |
3280 | breakpoints. | |
3281 | ||
3282 | If pending_flags was set in any thread, we queue any needed | |
3283 | signals, since we won't actually resume. We already have a pending | |
3284 | event to report, so we don't need to preserve any step requests; | |
3285 | they should be re-issued if necessary. */ | |
3286 | ||
3287 | static int | |
3288 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3289 | { |
54a0b537 | 3290 | struct lwp_info *lwp; |
5544ad89 | 3291 | struct thread_info *thread; |
bd99dc85 | 3292 | int step; |
d50171e4 PA |
3293 | int leave_all_stopped = * (int *) arg; |
3294 | int leave_pending; | |
5544ad89 DJ |
3295 | |
3296 | thread = (struct thread_info *) entry; | |
54a0b537 | 3297 | lwp = get_thread_lwp (thread); |
5544ad89 | 3298 | |
2bd7c093 | 3299 | if (lwp->resume == NULL) |
bd99dc85 | 3300 | return 0; |
5544ad89 | 3301 | |
bd99dc85 | 3302 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3303 | { |
bd99dc85 | 3304 | if (debug_threads) |
d50171e4 | 3305 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3306 | |
3307 | if (!lwp->stopped) | |
3308 | { | |
3309 | if (debug_threads) | |
d50171e4 | 3310 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3311 | |
d50171e4 PA |
3312 | /* Stop the thread, and wait for the event asynchronously, |
3313 | through the event loop. */ | |
02fc4de7 | 3314 | send_sigstop (lwp); |
bd99dc85 PA |
3315 | } |
3316 | else | |
3317 | { | |
3318 | if (debug_threads) | |
d50171e4 PA |
3319 | fprintf (stderr, "already stopped LWP %ld\n", |
3320 | lwpid_of (lwp)); | |
3321 | ||
3322 | /* The LWP may have been stopped in an internal event that | |
3323 | was not meant to be notified back to GDB (e.g., gdbserver | |
3324 | breakpoint), so we should be reporting a stop event in | |
3325 | this case too. */ | |
3326 | ||
3327 | /* If the thread already has a pending SIGSTOP, this is a | |
3328 | no-op. Otherwise, something later will presumably resume | |
3329 | the thread and this will cause it to cancel any pending | |
3330 | operation, due to last_resume_kind == resume_stop. If | |
3331 | the thread already has a pending status to report, we | |
3332 | will still report it the next time we wait - see | |
3333 | status_pending_p_callback. */ | |
02fc4de7 | 3334 | send_sigstop (lwp); |
bd99dc85 | 3335 | } |
32ca6d61 | 3336 | |
bd99dc85 PA |
3337 | /* For stop requests, we're done. */ |
3338 | lwp->resume = NULL; | |
fc7238bb | 3339 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3340 | return 0; |
5544ad89 DJ |
3341 | } |
3342 | ||
bd99dc85 PA |
3343 | /* If this thread which is about to be resumed has a pending status, |
3344 | then don't resume any threads - we can just report the pending | |
3345 | status. Make sure to queue any signals that would otherwise be | |
3346 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3347 | thread has a pending status. If there's a thread that needs the |
3348 | step-over-breakpoint dance, then don't resume any other thread | |
3349 | but that particular one. */ | |
3350 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3351 | |
d50171e4 | 3352 | if (!leave_pending) |
bd99dc85 PA |
3353 | { |
3354 | if (debug_threads) | |
3355 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3356 | |
d50171e4 | 3357 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3358 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3359 | } |
3360 | else | |
3361 | { | |
3362 | if (debug_threads) | |
3363 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3364 | |
bd99dc85 PA |
3365 | /* If we have a new signal, enqueue the signal. */ |
3366 | if (lwp->resume->sig != 0) | |
3367 | { | |
3368 | struct pending_signals *p_sig; | |
3369 | p_sig = xmalloc (sizeof (*p_sig)); | |
3370 | p_sig->prev = lwp->pending_signals; | |
3371 | p_sig->signal = lwp->resume->sig; | |
3372 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3373 | ||
3374 | /* If this is the same signal we were previously stopped by, | |
3375 | make sure to queue its siginfo. We can ignore the return | |
3376 | value of ptrace; if it fails, we'll skip | |
3377 | PTRACE_SETSIGINFO. */ | |
3378 | if (WIFSTOPPED (lwp->last_status) | |
3379 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
3380 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
3381 | ||
3382 | lwp->pending_signals = p_sig; | |
3383 | } | |
3384 | } | |
5544ad89 | 3385 | |
fc7238bb | 3386 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3387 | lwp->resume = NULL; |
5544ad89 | 3388 | return 0; |
0d62e5e8 DJ |
3389 | } |
3390 | ||
3391 | static void | |
2bd7c093 | 3392 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3393 | { |
2bd7c093 | 3394 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3395 | struct lwp_info *need_step_over = NULL; |
3396 | int any_pending; | |
3397 | int leave_all_stopped; | |
c6ecbae5 | 3398 | |
2bd7c093 | 3399 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3400 | |
d50171e4 PA |
3401 | /* If there is a thread which would otherwise be resumed, which has |
3402 | a pending status, then don't resume any threads - we can just | |
3403 | report the pending status. Make sure to queue any signals that | |
3404 | would otherwise be sent. In non-stop mode, we'll apply this | |
3405 | logic to each thread individually. We consume all pending events | |
3406 | before considering to start a step-over (in all-stop). */ | |
3407 | any_pending = 0; | |
bd99dc85 | 3408 | if (!non_stop) |
d50171e4 PA |
3409 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3410 | ||
3411 | /* If there is a thread which would otherwise be resumed, which is | |
3412 | stopped at a breakpoint that needs stepping over, then don't | |
3413 | resume any threads - have it step over the breakpoint with all | |
3414 | other threads stopped, then resume all threads again. Make sure | |
3415 | to queue any signals that would otherwise be delivered or | |
3416 | queued. */ | |
3417 | if (!any_pending && supports_breakpoints ()) | |
3418 | need_step_over | |
3419 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3420 | need_step_over_p, NULL); | |
3421 | ||
3422 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3423 | ||
3424 | if (debug_threads) | |
3425 | { | |
3426 | if (need_step_over != NULL) | |
3427 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3428 | else if (any_pending) | |
3429 | fprintf (stderr, | |
3430 | "Not resuming, all-stop and found " | |
3431 | "an LWP with pending status\n"); | |
3432 | else | |
3433 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3434 | } | |
3435 | ||
3436 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3437 | otherwise deliver. */ | |
3438 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3439 | ||
3440 | if (need_step_over) | |
3441 | start_step_over (need_step_over); | |
3442 | } | |
3443 | ||
3444 | /* This function is called once per thread. We check the thread's | |
3445 | last resume request, which will tell us whether to resume, step, or | |
3446 | leave the thread stopped. Any signal the client requested to be | |
3447 | delivered has already been enqueued at this point. | |
3448 | ||
3449 | If any thread that GDB wants running is stopped at an internal | |
3450 | breakpoint that needs stepping over, we start a step-over operation | |
3451 | on that particular thread, and leave all others stopped. */ | |
3452 | ||
7984d532 PA |
3453 | static int |
3454 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3455 | { |
7984d532 | 3456 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3457 | struct thread_info *thread; |
d50171e4 PA |
3458 | int step; |
3459 | ||
7984d532 PA |
3460 | if (lwp == except) |
3461 | return 0; | |
d50171e4 PA |
3462 | |
3463 | if (debug_threads) | |
3464 | fprintf (stderr, | |
3465 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3466 | ||
3467 | if (!lwp->stopped) | |
3468 | { | |
3469 | if (debug_threads) | |
3470 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3471 | return 0; |
d50171e4 PA |
3472 | } |
3473 | ||
8336d594 PA |
3474 | thread = get_lwp_thread (lwp); |
3475 | ||
02fc4de7 PA |
3476 | if (thread->last_resume_kind == resume_stop |
3477 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3478 | { |
3479 | if (debug_threads) | |
02fc4de7 PA |
3480 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3481 | lwpid_of (lwp)); | |
7984d532 | 3482 | return 0; |
d50171e4 PA |
3483 | } |
3484 | ||
3485 | if (lwp->status_pending_p) | |
3486 | { | |
3487 | if (debug_threads) | |
3488 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3489 | lwpid_of (lwp)); | |
7984d532 | 3490 | return 0; |
d50171e4 PA |
3491 | } |
3492 | ||
7984d532 PA |
3493 | gdb_assert (lwp->suspended >= 0); |
3494 | ||
d50171e4 PA |
3495 | if (lwp->suspended) |
3496 | { | |
3497 | if (debug_threads) | |
3498 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3499 | return 0; |
d50171e4 PA |
3500 | } |
3501 | ||
02fc4de7 PA |
3502 | if (thread->last_resume_kind == resume_stop) |
3503 | { | |
3504 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3505 | last_status.kind check above would catch it, and we wouldn't | |
3506 | reach here. This LWP may have been momentarily paused by a | |
3507 | stop_all_lwps call while handling for example, another LWP's | |
3508 | step-over. In that case, the pending expected SIGSTOP signal | |
3509 | that was queued at vCont;t handling time will have already | |
3510 | been consumed by wait_for_sigstop, and so we need to requeue | |
3511 | another one here. Note that if the LWP already has a SIGSTOP | |
3512 | pending, this is a no-op. */ | |
3513 | ||
3514 | if (debug_threads) | |
3515 | fprintf (stderr, | |
3516 | "Client wants LWP %ld to stop. " | |
3517 | "Making sure it has a SIGSTOP pending\n", | |
3518 | lwpid_of (lwp)); | |
3519 | ||
3520 | send_sigstop (lwp); | |
3521 | } | |
3522 | ||
8336d594 | 3523 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3524 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3525 | return 0; |
3526 | } | |
3527 | ||
3528 | static int | |
3529 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3530 | { | |
3531 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3532 | ||
3533 | if (lwp == except) | |
3534 | return 0; | |
3535 | ||
3536 | lwp->suspended--; | |
3537 | gdb_assert (lwp->suspended >= 0); | |
3538 | ||
3539 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3540 | } |
3541 | ||
3542 | /* When we finish a step-over, set threads running again. If there's | |
3543 | another thread that may need a step-over, now's the time to start | |
3544 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3545 | ||
3546 | static void | |
3547 | proceed_all_lwps (void) | |
3548 | { | |
3549 | struct lwp_info *need_step_over; | |
3550 | ||
3551 | /* If there is a thread which would otherwise be resumed, which is | |
3552 | stopped at a breakpoint that needs stepping over, then don't | |
3553 | resume any threads - have it step over the breakpoint with all | |
3554 | other threads stopped, then resume all threads again. */ | |
3555 | ||
3556 | if (supports_breakpoints ()) | |
3557 | { | |
3558 | need_step_over | |
3559 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3560 | need_step_over_p, NULL); | |
3561 | ||
3562 | if (need_step_over != NULL) | |
3563 | { | |
3564 | if (debug_threads) | |
3565 | fprintf (stderr, "proceed_all_lwps: found " | |
3566 | "thread %ld needing a step-over\n", | |
3567 | lwpid_of (need_step_over)); | |
3568 | ||
3569 | start_step_over (need_step_over); | |
3570 | return; | |
3571 | } | |
3572 | } | |
5544ad89 | 3573 | |
d50171e4 PA |
3574 | if (debug_threads) |
3575 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3576 | ||
7984d532 | 3577 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3578 | } |
3579 | ||
3580 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3581 | pending statuses, are set to run again, except for EXCEPT, if not | |
3582 | NULL. This undoes a stop_all_lwps call. */ | |
3583 | ||
3584 | static void | |
7984d532 | 3585 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3586 | { |
5544ad89 DJ |
3587 | if (debug_threads) |
3588 | { | |
d50171e4 PA |
3589 | if (except) |
3590 | fprintf (stderr, | |
3591 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3592 | else |
d50171e4 PA |
3593 | fprintf (stderr, |
3594 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3595 | } |
3596 | ||
7984d532 PA |
3597 | if (unsuspend) |
3598 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3599 | else | |
3600 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3601 | } |
3602 | ||
3603 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
3604 | |
3605 | int | |
0a30fbc4 | 3606 | register_addr (int regnum) |
da6d8c04 DJ |
3607 | { |
3608 | int addr; | |
3609 | ||
2ec06d2e | 3610 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
3611 | error ("Invalid register number %d.", regnum); |
3612 | ||
2ec06d2e | 3613 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
3614 | |
3615 | return addr; | |
3616 | } | |
3617 | ||
58caa3dc | 3618 | /* Fetch one register. */ |
da6d8c04 | 3619 | static void |
442ea881 | 3620 | fetch_register (struct regcache *regcache, int regno) |
da6d8c04 DJ |
3621 | { |
3622 | CORE_ADDR regaddr; | |
48d93c75 | 3623 | int i, size; |
0d62e5e8 | 3624 | char *buf; |
95954743 | 3625 | int pid; |
da6d8c04 | 3626 | |
2ec06d2e | 3627 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 3628 | return; |
2ec06d2e | 3629 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 3630 | return; |
da6d8c04 | 3631 | |
0a30fbc4 DJ |
3632 | regaddr = register_addr (regno); |
3633 | if (regaddr == -1) | |
3634 | return; | |
95954743 PA |
3635 | |
3636 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
3637 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
3638 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
3639 | buf = alloca (size); |
3640 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
3641 | { |
3642 | errno = 0; | |
0d62e5e8 | 3643 | *(PTRACE_XFER_TYPE *) (buf + i) = |
14ce3065 DE |
3644 | ptrace (PTRACE_PEEKUSER, pid, |
3645 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3646 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3647 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
da6d8c04 DJ |
3648 | regaddr += sizeof (PTRACE_XFER_TYPE); |
3649 | if (errno != 0) | |
f52cd8cd | 3650 | error ("reading register %d: %s", regno, strerror (errno)); |
da6d8c04 | 3651 | } |
ee1a7ae4 UW |
3652 | |
3653 | if (the_low_target.supply_ptrace_register) | |
442ea881 | 3654 | the_low_target.supply_ptrace_register (regcache, regno, buf); |
5a1f5858 | 3655 | else |
442ea881 | 3656 | supply_register (regcache, regno, buf); |
da6d8c04 DJ |
3657 | } |
3658 | ||
3659 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc | 3660 | static void |
442ea881 | 3661 | usr_fetch_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 3662 | { |
4463ce24 | 3663 | if (regno == -1) |
2ec06d2e | 3664 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 3665 | fetch_register (regcache, regno); |
da6d8c04 | 3666 | else |
442ea881 | 3667 | fetch_register (regcache, regno); |
da6d8c04 DJ |
3668 | } |
3669 | ||
3670 | /* Store our register values back into the inferior. | |
3671 | If REGNO is -1, do this for all registers. | |
3672 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc | 3673 | static void |
442ea881 | 3674 | usr_store_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 DJ |
3675 | { |
3676 | CORE_ADDR regaddr; | |
48d93c75 | 3677 | int i, size; |
0d62e5e8 | 3678 | char *buf; |
55ac2b99 | 3679 | int pid; |
da6d8c04 DJ |
3680 | |
3681 | if (regno >= 0) | |
3682 | { | |
2ec06d2e | 3683 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
3684 | return; |
3685 | ||
bc1e36ca | 3686 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
3687 | return; |
3688 | ||
3689 | regaddr = register_addr (regno); | |
3690 | if (regaddr == -1) | |
da6d8c04 | 3691 | return; |
da6d8c04 | 3692 | errno = 0; |
48d93c75 UW |
3693 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
3694 | & - sizeof (PTRACE_XFER_TYPE); | |
3695 | buf = alloca (size); | |
3696 | memset (buf, 0, size); | |
ee1a7ae4 UW |
3697 | |
3698 | if (the_low_target.collect_ptrace_register) | |
442ea881 | 3699 | the_low_target.collect_ptrace_register (regcache, regno, buf); |
5a1f5858 | 3700 | else |
442ea881 | 3701 | collect_register (regcache, regno, buf); |
ee1a7ae4 | 3702 | |
95954743 | 3703 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 3704 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 3705 | { |
0a30fbc4 | 3706 | errno = 0; |
14ce3065 DE |
3707 | ptrace (PTRACE_POKEUSER, pid, |
3708 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3709 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3710 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
3711 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
da6d8c04 DJ |
3712 | if (errno != 0) |
3713 | { | |
1b3f6016 PA |
3714 | /* At this point, ESRCH should mean the process is |
3715 | already gone, in which case we simply ignore attempts | |
3716 | to change its registers. See also the related | |
3717 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
3718 | if (errno == ESRCH) |
3719 | return; | |
3720 | ||
bc1e36ca | 3721 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
f52cd8cd | 3722 | error ("writing register %d: %s", regno, strerror (errno)); |
da6d8c04 | 3723 | } |
2ff29de4 | 3724 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 3725 | } |
da6d8c04 DJ |
3726 | } |
3727 | else | |
2ec06d2e | 3728 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 3729 | usr_store_inferior_registers (regcache, regno); |
da6d8c04 | 3730 | } |
58caa3dc DJ |
3731 | #endif /* HAVE_LINUX_USRREGS */ |
3732 | ||
3733 | ||
3734 | ||
3735 | #ifdef HAVE_LINUX_REGSETS | |
3736 | ||
3737 | static int | |
442ea881 | 3738 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3739 | { |
3740 | struct regset_info *regset; | |
e9d25b98 | 3741 | int saw_general_regs = 0; |
95954743 | 3742 | int pid; |
1570b33e | 3743 | struct iovec iov; |
58caa3dc DJ |
3744 | |
3745 | regset = target_regsets; | |
3746 | ||
95954743 | 3747 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3748 | while (regset->size >= 0) |
3749 | { | |
1570b33e L |
3750 | void *buf, *data; |
3751 | int nt_type, res; | |
58caa3dc | 3752 | |
52fa2412 | 3753 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3754 | { |
3755 | regset ++; | |
3756 | continue; | |
3757 | } | |
3758 | ||
bca929d3 | 3759 | buf = xmalloc (regset->size); |
1570b33e L |
3760 | |
3761 | nt_type = regset->nt_type; | |
3762 | if (nt_type) | |
3763 | { | |
3764 | iov.iov_base = buf; | |
3765 | iov.iov_len = regset->size; | |
3766 | data = (void *) &iov; | |
3767 | } | |
3768 | else | |
3769 | data = buf; | |
3770 | ||
dfb64f85 | 3771 | #ifndef __sparc__ |
1570b33e | 3772 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3773 | #else |
1570b33e | 3774 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 3775 | #endif |
58caa3dc DJ |
3776 | if (res < 0) |
3777 | { | |
3778 | if (errno == EIO) | |
3779 | { | |
52fa2412 UW |
3780 | /* If we get EIO on a regset, do not try it again for |
3781 | this process. */ | |
3782 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3783 | free (buf); |
52fa2412 | 3784 | continue; |
58caa3dc DJ |
3785 | } |
3786 | else | |
3787 | { | |
0d62e5e8 | 3788 | char s[256]; |
95954743 PA |
3789 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
3790 | pid); | |
0d62e5e8 | 3791 | perror (s); |
58caa3dc DJ |
3792 | } |
3793 | } | |
e9d25b98 DJ |
3794 | else if (regset->type == GENERAL_REGS) |
3795 | saw_general_regs = 1; | |
442ea881 | 3796 | regset->store_function (regcache, buf); |
58caa3dc | 3797 | regset ++; |
fdeb2a12 | 3798 | free (buf); |
58caa3dc | 3799 | } |
e9d25b98 DJ |
3800 | if (saw_general_regs) |
3801 | return 0; | |
3802 | else | |
3803 | return 1; | |
58caa3dc DJ |
3804 | } |
3805 | ||
3806 | static int | |
442ea881 | 3807 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3808 | { |
3809 | struct regset_info *regset; | |
e9d25b98 | 3810 | int saw_general_regs = 0; |
95954743 | 3811 | int pid; |
1570b33e | 3812 | struct iovec iov; |
58caa3dc DJ |
3813 | |
3814 | regset = target_regsets; | |
3815 | ||
95954743 | 3816 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3817 | while (regset->size >= 0) |
3818 | { | |
1570b33e L |
3819 | void *buf, *data; |
3820 | int nt_type, res; | |
58caa3dc | 3821 | |
52fa2412 | 3822 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3823 | { |
3824 | regset ++; | |
3825 | continue; | |
3826 | } | |
3827 | ||
bca929d3 | 3828 | buf = xmalloc (regset->size); |
545587ee DJ |
3829 | |
3830 | /* First fill the buffer with the current register set contents, | |
3831 | in case there are any items in the kernel's regset that are | |
3832 | not in gdbserver's regcache. */ | |
1570b33e L |
3833 | |
3834 | nt_type = regset->nt_type; | |
3835 | if (nt_type) | |
3836 | { | |
3837 | iov.iov_base = buf; | |
3838 | iov.iov_len = regset->size; | |
3839 | data = (void *) &iov; | |
3840 | } | |
3841 | else | |
3842 | data = buf; | |
3843 | ||
dfb64f85 | 3844 | #ifndef __sparc__ |
1570b33e | 3845 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3846 | #else |
1570b33e | 3847 | res = ptrace (regset->get_request, pid, &iov, data); |
dfb64f85 | 3848 | #endif |
545587ee DJ |
3849 | |
3850 | if (res == 0) | |
3851 | { | |
3852 | /* Then overlay our cached registers on that. */ | |
442ea881 | 3853 | regset->fill_function (regcache, buf); |
545587ee DJ |
3854 | |
3855 | /* Only now do we write the register set. */ | |
dfb64f85 | 3856 | #ifndef __sparc__ |
1570b33e | 3857 | res = ptrace (regset->set_request, pid, nt_type, data); |
dfb64f85 | 3858 | #else |
1570b33e | 3859 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 3860 | #endif |
545587ee DJ |
3861 | } |
3862 | ||
58caa3dc DJ |
3863 | if (res < 0) |
3864 | { | |
3865 | if (errno == EIO) | |
3866 | { | |
52fa2412 UW |
3867 | /* If we get EIO on a regset, do not try it again for |
3868 | this process. */ | |
3869 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3870 | free (buf); |
52fa2412 | 3871 | continue; |
58caa3dc | 3872 | } |
3221518c UW |
3873 | else if (errno == ESRCH) |
3874 | { | |
1b3f6016 PA |
3875 | /* At this point, ESRCH should mean the process is |
3876 | already gone, in which case we simply ignore attempts | |
3877 | to change its registers. See also the related | |
3878 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 3879 | free (buf); |
3221518c UW |
3880 | return 0; |
3881 | } | |
58caa3dc DJ |
3882 | else |
3883 | { | |
ce3a066d | 3884 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
3885 | } |
3886 | } | |
e9d25b98 DJ |
3887 | else if (regset->type == GENERAL_REGS) |
3888 | saw_general_regs = 1; | |
58caa3dc | 3889 | regset ++; |
09ec9b38 | 3890 | free (buf); |
58caa3dc | 3891 | } |
e9d25b98 DJ |
3892 | if (saw_general_regs) |
3893 | return 0; | |
3894 | else | |
3895 | return 1; | |
ce3a066d | 3896 | return 0; |
58caa3dc DJ |
3897 | } |
3898 | ||
3899 | #endif /* HAVE_LINUX_REGSETS */ | |
3900 | ||
3901 | ||
3902 | void | |
442ea881 | 3903 | linux_fetch_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3904 | { |
3905 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3906 | if (regsets_fetch_inferior_registers (regcache) == 0) |
52fa2412 | 3907 | return; |
58caa3dc DJ |
3908 | #endif |
3909 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3910 | usr_fetch_inferior_registers (regcache, regno); |
58caa3dc DJ |
3911 | #endif |
3912 | } | |
3913 | ||
3914 | void | |
442ea881 | 3915 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3916 | { |
3917 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3918 | if (regsets_store_inferior_registers (regcache) == 0) |
52fa2412 | 3919 | return; |
58caa3dc DJ |
3920 | #endif |
3921 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3922 | usr_store_inferior_registers (regcache, regno); |
58caa3dc DJ |
3923 | #endif |
3924 | } | |
3925 | ||
da6d8c04 | 3926 | |
da6d8c04 DJ |
3927 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
3928 | to debugger memory starting at MYADDR. */ | |
3929 | ||
c3e735a6 | 3930 | static int |
f450004a | 3931 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
3932 | { |
3933 | register int i; | |
3934 | /* Round starting address down to longword boundary. */ | |
3935 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
3936 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
3937 | register int count |
3938 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
3939 | / sizeof (PTRACE_XFER_TYPE); |
3940 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 3941 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 3942 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
3943 | int fd; |
3944 | char filename[64]; | |
95954743 | 3945 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
3946 | |
3947 | /* Try using /proc. Don't bother for one word. */ | |
3948 | if (len >= 3 * sizeof (long)) | |
3949 | { | |
3950 | /* We could keep this file open and cache it - possibly one per | |
3951 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 3952 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
3953 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
3954 | if (fd == -1) | |
3955 | goto no_proc; | |
3956 | ||
3957 | /* If pread64 is available, use it. It's faster if the kernel | |
3958 | supports it (only one syscall), and it's 64-bit safe even on | |
3959 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
3960 | application). */ | |
3961 | #ifdef HAVE_PREAD64 | |
3962 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
3963 | #else | |
1de1badb | 3964 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
3965 | #endif |
3966 | { | |
3967 | close (fd); | |
3968 | goto no_proc; | |
3969 | } | |
3970 | ||
3971 | close (fd); | |
3972 | return 0; | |
3973 | } | |
da6d8c04 | 3974 | |
fd462a61 | 3975 | no_proc: |
da6d8c04 DJ |
3976 | /* Read all the longwords */ |
3977 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
3978 | { | |
c3e735a6 | 3979 | errno = 0; |
14ce3065 DE |
3980 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
3981 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3982 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
3983 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
3984 | if (errno) |
3985 | return errno; | |
da6d8c04 DJ |
3986 | } |
3987 | ||
3988 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
3989 | memcpy (myaddr, |
3990 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
3991 | len); | |
c3e735a6 DJ |
3992 | |
3993 | return 0; | |
da6d8c04 DJ |
3994 | } |
3995 | ||
93ae6fdc PA |
3996 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
3997 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
3998 | returns the value of errno. */ |
3999 | ||
ce3a066d | 4000 | static int |
f450004a | 4001 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4002 | { |
4003 | register int i; | |
4004 | /* Round starting address down to longword boundary. */ | |
4005 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4006 | /* Round ending address up; get number of longwords that makes. */ | |
4007 | register int count | |
4008 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
4009 | /* Allocate buffer of that many longwords. */ | |
4010 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 4011 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4012 | |
0d62e5e8 DJ |
4013 | if (debug_threads) |
4014 | { | |
58d6951d DJ |
4015 | /* Dump up to four bytes. */ |
4016 | unsigned int val = * (unsigned int *) myaddr; | |
4017 | if (len == 1) | |
4018 | val = val & 0xff; | |
4019 | else if (len == 2) | |
4020 | val = val & 0xffff; | |
4021 | else if (len == 3) | |
4022 | val = val & 0xffffff; | |
4023 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4024 | val, (long)memaddr); | |
0d62e5e8 DJ |
4025 | } |
4026 | ||
da6d8c04 DJ |
4027 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4028 | ||
93ae6fdc | 4029 | errno = 0; |
14ce3065 DE |
4030 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4031 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4032 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
4033 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
4034 | if (errno) |
4035 | return errno; | |
da6d8c04 DJ |
4036 | |
4037 | if (count > 1) | |
4038 | { | |
93ae6fdc | 4039 | errno = 0; |
da6d8c04 | 4040 | buffer[count - 1] |
95954743 | 4041 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4042 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4043 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4044 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4045 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 4046 | 0); |
93ae6fdc PA |
4047 | if (errno) |
4048 | return errno; | |
da6d8c04 DJ |
4049 | } |
4050 | ||
93ae6fdc | 4051 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 DJ |
4052 | |
4053 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
4054 | ||
4055 | /* Write the entire buffer. */ | |
4056 | ||
4057 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4058 | { | |
4059 | errno = 0; | |
14ce3065 DE |
4060 | ptrace (PTRACE_POKETEXT, pid, |
4061 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4062 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4063 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4064 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4065 | if (errno) |
4066 | return errno; | |
4067 | } | |
4068 | ||
4069 | return 0; | |
4070 | } | |
2f2893d9 | 4071 | |
6076632b | 4072 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4073 | static int linux_supports_tracefork_flag; |
4074 | ||
1e7fc18c PA |
4075 | static void |
4076 | linux_enable_event_reporting (int pid) | |
4077 | { | |
4078 | if (!linux_supports_tracefork_flag) | |
4079 | return; | |
4080 | ||
4081 | ptrace (PTRACE_SETOPTIONS, pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
4082 | } | |
4083 | ||
51c2684e | 4084 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4085 | |
51c2684e DJ |
4086 | static int |
4087 | linux_tracefork_grandchild (void *arg) | |
4088 | { | |
4089 | _exit (0); | |
4090 | } | |
4091 | ||
7407e2de AS |
4092 | #define STACK_SIZE 4096 |
4093 | ||
51c2684e DJ |
4094 | static int |
4095 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
4096 | { |
4097 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
4098 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
4099 | |
4100 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4101 | ||
4102 | if (fork () == 0) | |
4103 | linux_tracefork_grandchild (NULL); | |
4104 | ||
4105 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4106 | ||
7407e2de AS |
4107 | #ifdef __ia64__ |
4108 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4109 | CLONE_VM | SIGCHLD, NULL); | |
4110 | #else | |
4111 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
4112 | CLONE_VM | SIGCHLD, NULL); | |
4113 | #endif | |
e4b7f41c JK |
4114 | |
4115 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4116 | ||
24a09b5f DJ |
4117 | _exit (0); |
4118 | } | |
4119 | ||
24a09b5f DJ |
4120 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4121 | sure that we can enable the option, and that it had the desired | |
4122 | effect. */ | |
4123 | ||
4124 | static void | |
4125 | linux_test_for_tracefork (void) | |
4126 | { | |
4127 | int child_pid, ret, status; | |
4128 | long second_pid; | |
e4b7f41c | 4129 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4130 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4131 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4132 | |
4133 | linux_supports_tracefork_flag = 0; | |
4134 | ||
e4b7f41c JK |
4135 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4136 | ||
4137 | child_pid = fork (); | |
4138 | if (child_pid == 0) | |
4139 | linux_tracefork_child (NULL); | |
4140 | ||
4141 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4142 | ||
51c2684e | 4143 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4144 | #ifdef __ia64__ |
4145 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4146 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4147 | #else /* !__ia64__ */ |
7407e2de AS |
4148 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4149 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4150 | #endif /* !__ia64__ */ |
4151 | ||
4152 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4153 | ||
24a09b5f | 4154 | if (child_pid == -1) |
51c2684e | 4155 | perror_with_name ("clone"); |
24a09b5f DJ |
4156 | |
4157 | ret = my_waitpid (child_pid, &status, 0); | |
4158 | if (ret == -1) | |
4159 | perror_with_name ("waitpid"); | |
4160 | else if (ret != child_pid) | |
4161 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4162 | if (! WIFSTOPPED (status)) | |
4163 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4164 | ||
14ce3065 DE |
4165 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
4166 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
4167 | if (ret != 0) |
4168 | { | |
4169 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4170 | if (ret != 0) | |
4171 | { | |
4172 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4173 | return; | |
4174 | } | |
4175 | ||
4176 | ret = my_waitpid (child_pid, &status, 0); | |
4177 | if (ret != child_pid) | |
4178 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4179 | else if (!WIFSIGNALED (status)) | |
4180 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4181 | "killed child", status); | |
4182 | ||
4183 | return; | |
4184 | } | |
4185 | ||
4186 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
4187 | if (ret != 0) | |
4188 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4189 | ||
4190 | ret = my_waitpid (child_pid, &status, 0); | |
4191 | ||
4192 | if (ret == child_pid && WIFSTOPPED (status) | |
4193 | && status >> 16 == PTRACE_EVENT_FORK) | |
4194 | { | |
4195 | second_pid = 0; | |
4196 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
4197 | if (ret == 0 && second_pid != 0) | |
4198 | { | |
4199 | int second_status; | |
4200 | ||
4201 | linux_supports_tracefork_flag = 1; | |
4202 | my_waitpid (second_pid, &second_status, 0); | |
4203 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
4204 | if (ret != 0) | |
4205 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4206 | my_waitpid (second_pid, &status, 0); | |
4207 | } | |
4208 | } | |
4209 | else | |
4210 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4211 | "(%d, status 0x%x)", ret, status); | |
4212 | ||
4213 | do | |
4214 | { | |
4215 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4216 | if (ret != 0) | |
4217 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4218 | my_waitpid (child_pid, &status, 0); | |
4219 | } | |
4220 | while (WIFSTOPPED (status)); | |
51c2684e | 4221 | |
e4b7f41c | 4222 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4223 | free (stack); |
e4b7f41c | 4224 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4225 | } |
4226 | ||
4227 | ||
2f2893d9 DJ |
4228 | static void |
4229 | linux_look_up_symbols (void) | |
4230 | { | |
0d62e5e8 | 4231 | #ifdef USE_THREAD_DB |
95954743 PA |
4232 | struct process_info *proc = current_process (); |
4233 | ||
cdbfd419 | 4234 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4235 | return; |
4236 | ||
6076632b DE |
4237 | /* If the kernel supports tracing forks then it also supports tracing |
4238 | clones, and then we don't need to use the magic thread event breakpoint | |
4239 | to learn about threads. */ | |
cdbfd419 | 4240 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4241 | #endif |
4242 | } | |
4243 | ||
e5379b03 | 4244 | static void |
ef57601b | 4245 | linux_request_interrupt (void) |
e5379b03 | 4246 | { |
a1928bad | 4247 | extern unsigned long signal_pid; |
e5379b03 | 4248 | |
95954743 PA |
4249 | if (!ptid_equal (cont_thread, null_ptid) |
4250 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4251 | { |
54a0b537 | 4252 | struct lwp_info *lwp; |
bd99dc85 | 4253 | int lwpid; |
e5379b03 | 4254 | |
54a0b537 | 4255 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4256 | lwpid = lwpid_of (lwp); |
4257 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4258 | } |
4259 | else | |
ef57601b | 4260 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4261 | } |
4262 | ||
aa691b87 RM |
4263 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4264 | to debugger memory starting at MYADDR. */ | |
4265 | ||
4266 | static int | |
f450004a | 4267 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4268 | { |
4269 | char filename[PATH_MAX]; | |
4270 | int fd, n; | |
95954743 | 4271 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4272 | |
95954743 | 4273 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4274 | |
4275 | fd = open (filename, O_RDONLY); | |
4276 | if (fd < 0) | |
4277 | return -1; | |
4278 | ||
4279 | if (offset != (CORE_ADDR) 0 | |
4280 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4281 | n = -1; | |
4282 | else | |
4283 | n = read (fd, myaddr, len); | |
4284 | ||
4285 | close (fd); | |
4286 | ||
4287 | return n; | |
4288 | } | |
4289 | ||
d993e290 PA |
4290 | /* These breakpoint and watchpoint related wrapper functions simply |
4291 | pass on the function call if the target has registered a | |
4292 | corresponding function. */ | |
e013ee27 OF |
4293 | |
4294 | static int | |
d993e290 | 4295 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4296 | { |
d993e290 PA |
4297 | if (the_low_target.insert_point != NULL) |
4298 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4299 | else |
4300 | /* Unsupported (see target.h). */ | |
4301 | return 1; | |
4302 | } | |
4303 | ||
4304 | static int | |
d993e290 | 4305 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4306 | { |
d993e290 PA |
4307 | if (the_low_target.remove_point != NULL) |
4308 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4309 | else |
4310 | /* Unsupported (see target.h). */ | |
4311 | return 1; | |
4312 | } | |
4313 | ||
4314 | static int | |
4315 | linux_stopped_by_watchpoint (void) | |
4316 | { | |
c3adc08c PA |
4317 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4318 | ||
4319 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4320 | } |
4321 | ||
4322 | static CORE_ADDR | |
4323 | linux_stopped_data_address (void) | |
4324 | { | |
c3adc08c PA |
4325 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4326 | ||
4327 | return lwp->stopped_data_address; | |
e013ee27 OF |
4328 | } |
4329 | ||
42c81e2a | 4330 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
4331 | #if defined(__mcoldfire__) |
4332 | /* These should really be defined in the kernel's ptrace.h header. */ | |
4333 | #define PT_TEXT_ADDR 49*4 | |
4334 | #define PT_DATA_ADDR 50*4 | |
4335 | #define PT_TEXT_END_ADDR 51*4 | |
4336 | #endif | |
4337 | ||
4338 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4339 | to tell gdb about. */ | |
4340 | ||
4341 | static int | |
4342 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4343 | { | |
4344 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
4345 | unsigned long text, text_end, data; | |
bd99dc85 | 4346 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4347 | |
4348 | errno = 0; | |
4349 | ||
4350 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
4351 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
4352 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
4353 | ||
4354 | if (errno == 0) | |
4355 | { | |
4356 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4357 | used by gdb) are relative to the beginning of the program, |
4358 | with the data segment immediately following the text segment. | |
4359 | However, the actual runtime layout in memory may put the data | |
4360 | somewhere else, so when we send gdb a data base-address, we | |
4361 | use the real data base address and subtract the compile-time | |
4362 | data base-address from it (which is just the length of the | |
4363 | text segment). BSS immediately follows data in both | |
4364 | cases. */ | |
52fb6437 NS |
4365 | *text_p = text; |
4366 | *data_p = data - (text_end - text); | |
1b3f6016 | 4367 | |
52fb6437 NS |
4368 | return 1; |
4369 | } | |
4370 | #endif | |
4371 | return 0; | |
4372 | } | |
4373 | #endif | |
4374 | ||
dc146f7c VP |
4375 | static int |
4376 | compare_ints (const void *xa, const void *xb) | |
4377 | { | |
4378 | int a = *(const int *)xa; | |
4379 | int b = *(const int *)xb; | |
4380 | ||
4381 | return a - b; | |
4382 | } | |
4383 | ||
4384 | static int * | |
4385 | unique (int *b, int *e) | |
4386 | { | |
4387 | int *d = b; | |
4388 | while (++b != e) | |
4389 | if (*d != *b) | |
4390 | *++d = *b; | |
4391 | return ++d; | |
4392 | } | |
4393 | ||
4394 | /* Given PID, iterates over all threads in that process. | |
4395 | ||
4396 | Information about each thread, in a format suitable for qXfer:osdata:thread | |
4397 | is printed to BUFFER, if it's not NULL. BUFFER is assumed to be already | |
4398 | initialized, and the caller is responsible for finishing and appending '\0' | |
4399 | to it. | |
4400 | ||
4401 | The list of cores that threads are running on is assigned to *CORES, if it | |
4402 | is not NULL. If no cores are found, *CORES will be set to NULL. Caller | |
4403 | should free *CORES. */ | |
4404 | ||
4405 | static void | |
4406 | list_threads (int pid, struct buffer *buffer, char **cores) | |
4407 | { | |
4408 | int count = 0; | |
4409 | int allocated = 10; | |
4410 | int *core_numbers = xmalloc (sizeof (int) * allocated); | |
4411 | char pathname[128]; | |
4412 | DIR *dir; | |
4413 | struct dirent *dp; | |
4414 | struct stat statbuf; | |
4415 | ||
4416 | sprintf (pathname, "/proc/%d/task", pid); | |
4417 | if (stat (pathname, &statbuf) == 0 && S_ISDIR (statbuf.st_mode)) | |
4418 | { | |
4419 | dir = opendir (pathname); | |
4420 | if (!dir) | |
4421 | { | |
4422 | free (core_numbers); | |
4423 | return; | |
4424 | } | |
4425 | ||
4426 | while ((dp = readdir (dir)) != NULL) | |
4427 | { | |
4428 | unsigned long lwp = strtoul (dp->d_name, NULL, 10); | |
4429 | ||
4430 | if (lwp != 0) | |
4431 | { | |
4432 | unsigned core = linux_core_of_thread (ptid_build (pid, lwp, 0)); | |
4433 | ||
4434 | if (core != -1) | |
4435 | { | |
4436 | char s[sizeof ("4294967295")]; | |
4437 | sprintf (s, "%u", core); | |
4438 | ||
4439 | if (count == allocated) | |
4440 | { | |
4441 | allocated *= 2; | |
4442 | core_numbers = realloc (core_numbers, | |
4443 | sizeof (int) * allocated); | |
4444 | } | |
4445 | core_numbers[count++] = core; | |
4446 | if (buffer) | |
4447 | buffer_xml_printf (buffer, | |
4448 | "<item>" | |
4449 | "<column name=\"pid\">%d</column>" | |
4450 | "<column name=\"tid\">%s</column>" | |
4451 | "<column name=\"core\">%s</column>" | |
4452 | "</item>", pid, dp->d_name, s); | |
4453 | } | |
4454 | else | |
4455 | { | |
4456 | if (buffer) | |
4457 | buffer_xml_printf (buffer, | |
4458 | "<item>" | |
4459 | "<column name=\"pid\">%d</column>" | |
4460 | "<column name=\"tid\">%s</column>" | |
4461 | "</item>", pid, dp->d_name); | |
4462 | } | |
4463 | } | |
4464 | } | |
4465 | } | |
4466 | ||
4467 | if (cores) | |
4468 | { | |
4469 | *cores = NULL; | |
4470 | if (count > 0) | |
4471 | { | |
4472 | struct buffer buffer2; | |
4473 | int *b; | |
4474 | int *e; | |
4475 | qsort (core_numbers, count, sizeof (int), compare_ints); | |
4476 | ||
4477 | /* Remove duplicates. */ | |
4478 | b = core_numbers; | |
4479 | e = unique (b, core_numbers + count); | |
4480 | ||
4481 | buffer_init (&buffer2); | |
4482 | ||
4483 | for (b = core_numbers; b != e; ++b) | |
4484 | { | |
4485 | char number[sizeof ("4294967295")]; | |
4486 | sprintf (number, "%u", *b); | |
4487 | buffer_xml_printf (&buffer2, "%s%s", | |
4488 | (b == core_numbers) ? "" : ",", number); | |
4489 | } | |
4490 | buffer_grow_str0 (&buffer2, ""); | |
4491 | ||
4492 | *cores = buffer_finish (&buffer2); | |
4493 | } | |
4494 | } | |
4495 | free (core_numbers); | |
4496 | } | |
4497 | ||
4498 | static void | |
4499 | show_process (int pid, const char *username, struct buffer *buffer) | |
4500 | { | |
4501 | char pathname[128]; | |
4502 | FILE *f; | |
4503 | char cmd[MAXPATHLEN + 1]; | |
4504 | ||
4505 | sprintf (pathname, "/proc/%d/cmdline", pid); | |
4506 | ||
4507 | if ((f = fopen (pathname, "r")) != NULL) | |
4508 | { | |
4509 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
4510 | if (len > 0) | |
4511 | { | |
4512 | char *cores = 0; | |
4513 | int i; | |
4514 | for (i = 0; i < len; i++) | |
4515 | if (cmd[i] == '\0') | |
4516 | cmd[i] = ' '; | |
4517 | cmd[len] = '\0'; | |
4518 | ||
4519 | buffer_xml_printf (buffer, | |
4520 | "<item>" | |
4521 | "<column name=\"pid\">%d</column>" | |
4522 | "<column name=\"user\">%s</column>" | |
4523 | "<column name=\"command\">%s</column>", | |
4524 | pid, | |
4525 | username, | |
4526 | cmd); | |
4527 | ||
4528 | /* This only collects core numbers, and does not print threads. */ | |
4529 | list_threads (pid, NULL, &cores); | |
4530 | ||
4531 | if (cores) | |
4532 | { | |
4533 | buffer_xml_printf (buffer, | |
4534 | "<column name=\"cores\">%s</column>", cores); | |
4535 | free (cores); | |
4536 | } | |
4537 | ||
4538 | buffer_xml_printf (buffer, "</item>"); | |
4539 | } | |
4540 | fclose (f); | |
4541 | } | |
4542 | } | |
4543 | ||
07e059b5 VP |
4544 | static int |
4545 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4546 | unsigned char *readbuf, unsigned const char *writebuf, |
4547 | CORE_ADDR offset, int len) | |
07e059b5 VP |
4548 | { |
4549 | /* We make the process list snapshot when the object starts to be | |
4550 | read. */ | |
4551 | static const char *buf; | |
4552 | static long len_avail = -1; | |
4553 | static struct buffer buffer; | |
dc146f7c VP |
4554 | int processes = 0; |
4555 | int threads = 0; | |
07e059b5 VP |
4556 | |
4557 | DIR *dirp; | |
4558 | ||
dc146f7c VP |
4559 | if (strcmp (annex, "processes") == 0) |
4560 | processes = 1; | |
4561 | else if (strcmp (annex, "threads") == 0) | |
4562 | threads = 1; | |
4563 | else | |
07e059b5 VP |
4564 | return 0; |
4565 | ||
4566 | if (!readbuf || writebuf) | |
4567 | return 0; | |
4568 | ||
4569 | if (offset == 0) | |
4570 | { | |
4571 | if (len_avail != -1 && len_avail != 0) | |
4572 | buffer_free (&buffer); | |
4573 | len_avail = 0; | |
4574 | buf = NULL; | |
4575 | buffer_init (&buffer); | |
dc146f7c VP |
4576 | if (processes) |
4577 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
4578 | else if (threads) | |
4579 | buffer_grow_str (&buffer, "<osdata type=\"threads\">"); | |
07e059b5 VP |
4580 | |
4581 | dirp = opendir ("/proc"); | |
4582 | if (dirp) | |
4583 | { | |
1b3f6016 PA |
4584 | struct dirent *dp; |
4585 | while ((dp = readdir (dirp)) != NULL) | |
4586 | { | |
4587 | struct stat statbuf; | |
4588 | char procentry[sizeof ("/proc/4294967295")]; | |
4589 | ||
4590 | if (!isdigit (dp->d_name[0]) | |
4591 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
4592 | continue; | |
4593 | ||
4594 | sprintf (procentry, "/proc/%s", dp->d_name); | |
4595 | if (stat (procentry, &statbuf) == 0 | |
4596 | && S_ISDIR (statbuf.st_mode)) | |
4597 | { | |
dc146f7c | 4598 | int pid = (int) strtoul (dp->d_name, NULL, 10); |
1b3f6016 | 4599 | |
dc146f7c | 4600 | if (processes) |
1b3f6016 | 4601 | { |
dc146f7c VP |
4602 | struct passwd *entry = getpwuid (statbuf.st_uid); |
4603 | show_process (pid, entry ? entry->pw_name : "?", &buffer); | |
4604 | } | |
4605 | else if (threads) | |
4606 | { | |
4607 | list_threads (pid, &buffer, NULL); | |
1b3f6016 PA |
4608 | } |
4609 | } | |
4610 | } | |
07e059b5 | 4611 | |
1b3f6016 | 4612 | closedir (dirp); |
07e059b5 VP |
4613 | } |
4614 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
4615 | buf = buffer_finish (&buffer); | |
4616 | len_avail = strlen (buf); | |
4617 | } | |
4618 | ||
4619 | if (offset >= len_avail) | |
4620 | { | |
4621 | /* Done. Get rid of the data. */ | |
4622 | buffer_free (&buffer); | |
4623 | buf = NULL; | |
4624 | len_avail = 0; | |
4625 | return 0; | |
4626 | } | |
4627 | ||
4628 | if (len > len_avail - offset) | |
4629 | len = len_avail - offset; | |
4630 | memcpy (readbuf, buf + offset, len); | |
4631 | ||
4632 | return len; | |
4633 | } | |
4634 | ||
d0722149 DE |
4635 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4636 | layout of the inferiors' architecture. */ | |
4637 | ||
4638 | static void | |
4639 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
4640 | { | |
4641 | int done = 0; | |
4642 | ||
4643 | if (the_low_target.siginfo_fixup != NULL) | |
4644 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4645 | ||
4646 | /* If there was no callback, or the callback didn't do anything, | |
4647 | then just do a straight memcpy. */ | |
4648 | if (!done) | |
4649 | { | |
4650 | if (direction == 1) | |
4651 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4652 | else | |
4653 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4654 | } | |
4655 | } | |
4656 | ||
4aa995e1 PA |
4657 | static int |
4658 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4659 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4660 | { | |
d0722149 | 4661 | int pid; |
4aa995e1 | 4662 | struct siginfo siginfo; |
d0722149 | 4663 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4664 | |
4665 | if (current_inferior == NULL) | |
4666 | return -1; | |
4667 | ||
bd99dc85 | 4668 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4669 | |
4670 | if (debug_threads) | |
d0722149 | 4671 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4672 | readbuf != NULL ? "Reading" : "Writing", |
4673 | pid); | |
4674 | ||
4675 | if (offset > sizeof (siginfo)) | |
4676 | return -1; | |
4677 | ||
4678 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
4679 | return -1; | |
4680 | ||
d0722149 DE |
4681 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4682 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4683 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4684 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4685 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4686 | ||
4aa995e1 PA |
4687 | if (offset + len > sizeof (siginfo)) |
4688 | len = sizeof (siginfo) - offset; | |
4689 | ||
4690 | if (readbuf != NULL) | |
d0722149 | 4691 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4692 | else |
4693 | { | |
d0722149 DE |
4694 | memcpy (inf_siginfo + offset, writebuf, len); |
4695 | ||
4696 | /* Convert back to ptrace layout before flushing it out. */ | |
4697 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4698 | ||
4aa995e1 PA |
4699 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
4700 | return -1; | |
4701 | } | |
4702 | ||
4703 | return len; | |
4704 | } | |
4705 | ||
bd99dc85 PA |
4706 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4707 | so we notice when children change state; as the handler for the | |
4708 | sigsuspend in my_waitpid. */ | |
4709 | ||
4710 | static void | |
4711 | sigchld_handler (int signo) | |
4712 | { | |
4713 | int old_errno = errno; | |
4714 | ||
4715 | if (debug_threads) | |
e581f2b4 PA |
4716 | { |
4717 | do | |
4718 | { | |
4719 | /* fprintf is not async-signal-safe, so call write | |
4720 | directly. */ | |
4721 | if (write (2, "sigchld_handler\n", | |
4722 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4723 | break; /* just ignore */ | |
4724 | } while (0); | |
4725 | } | |
bd99dc85 PA |
4726 | |
4727 | if (target_is_async_p ()) | |
4728 | async_file_mark (); /* trigger a linux_wait */ | |
4729 | ||
4730 | errno = old_errno; | |
4731 | } | |
4732 | ||
4733 | static int | |
4734 | linux_supports_non_stop (void) | |
4735 | { | |
4736 | return 1; | |
4737 | } | |
4738 | ||
4739 | static int | |
4740 | linux_async (int enable) | |
4741 | { | |
4742 | int previous = (linux_event_pipe[0] != -1); | |
4743 | ||
8336d594 PA |
4744 | if (debug_threads) |
4745 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4746 | enable, previous); | |
4747 | ||
bd99dc85 PA |
4748 | if (previous != enable) |
4749 | { | |
4750 | sigset_t mask; | |
4751 | sigemptyset (&mask); | |
4752 | sigaddset (&mask, SIGCHLD); | |
4753 | ||
4754 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4755 | ||
4756 | if (enable) | |
4757 | { | |
4758 | if (pipe (linux_event_pipe) == -1) | |
4759 | fatal ("creating event pipe failed."); | |
4760 | ||
4761 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4762 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4763 | ||
4764 | /* Register the event loop handler. */ | |
4765 | add_file_handler (linux_event_pipe[0], | |
4766 | handle_target_event, NULL); | |
4767 | ||
4768 | /* Always trigger a linux_wait. */ | |
4769 | async_file_mark (); | |
4770 | } | |
4771 | else | |
4772 | { | |
4773 | delete_file_handler (linux_event_pipe[0]); | |
4774 | ||
4775 | close (linux_event_pipe[0]); | |
4776 | close (linux_event_pipe[1]); | |
4777 | linux_event_pipe[0] = -1; | |
4778 | linux_event_pipe[1] = -1; | |
4779 | } | |
4780 | ||
4781 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4782 | } | |
4783 | ||
4784 | return previous; | |
4785 | } | |
4786 | ||
4787 | static int | |
4788 | linux_start_non_stop (int nonstop) | |
4789 | { | |
4790 | /* Register or unregister from event-loop accordingly. */ | |
4791 | linux_async (nonstop); | |
4792 | return 0; | |
4793 | } | |
4794 | ||
cf8fd78b PA |
4795 | static int |
4796 | linux_supports_multi_process (void) | |
4797 | { | |
4798 | return 1; | |
4799 | } | |
4800 | ||
efcbbd14 UW |
4801 | |
4802 | /* Enumerate spufs IDs for process PID. */ | |
4803 | static int | |
4804 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
4805 | { | |
4806 | int pos = 0; | |
4807 | int written = 0; | |
4808 | char path[128]; | |
4809 | DIR *dir; | |
4810 | struct dirent *entry; | |
4811 | ||
4812 | sprintf (path, "/proc/%ld/fd", pid); | |
4813 | dir = opendir (path); | |
4814 | if (!dir) | |
4815 | return -1; | |
4816 | ||
4817 | rewinddir (dir); | |
4818 | while ((entry = readdir (dir)) != NULL) | |
4819 | { | |
4820 | struct stat st; | |
4821 | struct statfs stfs; | |
4822 | int fd; | |
4823 | ||
4824 | fd = atoi (entry->d_name); | |
4825 | if (!fd) | |
4826 | continue; | |
4827 | ||
4828 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4829 | if (stat (path, &st) != 0) | |
4830 | continue; | |
4831 | if (!S_ISDIR (st.st_mode)) | |
4832 | continue; | |
4833 | ||
4834 | if (statfs (path, &stfs) != 0) | |
4835 | continue; | |
4836 | if (stfs.f_type != SPUFS_MAGIC) | |
4837 | continue; | |
4838 | ||
4839 | if (pos >= offset && pos + 4 <= offset + len) | |
4840 | { | |
4841 | *(unsigned int *)(buf + pos - offset) = fd; | |
4842 | written += 4; | |
4843 | } | |
4844 | pos += 4; | |
4845 | } | |
4846 | ||
4847 | closedir (dir); | |
4848 | return written; | |
4849 | } | |
4850 | ||
4851 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4852 | object type, using the /proc file system. */ | |
4853 | static int | |
4854 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4855 | unsigned const char *writebuf, | |
4856 | CORE_ADDR offset, int len) | |
4857 | { | |
4858 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4859 | char buf[128]; | |
4860 | int fd = 0; | |
4861 | int ret = 0; | |
4862 | ||
4863 | if (!writebuf && !readbuf) | |
4864 | return -1; | |
4865 | ||
4866 | if (!*annex) | |
4867 | { | |
4868 | if (!readbuf) | |
4869 | return -1; | |
4870 | else | |
4871 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4872 | } | |
4873 | ||
4874 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
4875 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4876 | if (fd <= 0) | |
4877 | return -1; | |
4878 | ||
4879 | if (offset != 0 | |
4880 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4881 | { | |
4882 | close (fd); | |
4883 | return 0; | |
4884 | } | |
4885 | ||
4886 | if (writebuf) | |
4887 | ret = write (fd, writebuf, (size_t) len); | |
4888 | else | |
4889 | ret = read (fd, readbuf, (size_t) len); | |
4890 | ||
4891 | close (fd); | |
4892 | return ret; | |
4893 | } | |
4894 | ||
dc146f7c VP |
4895 | static int |
4896 | linux_core_of_thread (ptid_t ptid) | |
4897 | { | |
4898 | char filename[sizeof ("/proc//task//stat") | |
4899 | + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */ | |
4900 | + 1]; | |
4901 | FILE *f; | |
4902 | char *content = NULL; | |
4903 | char *p; | |
4904 | char *ts = 0; | |
4905 | int content_read = 0; | |
4906 | int i; | |
4907 | int core; | |
4908 | ||
4909 | sprintf (filename, "/proc/%d/task/%ld/stat", | |
4910 | ptid_get_pid (ptid), ptid_get_lwp (ptid)); | |
4911 | f = fopen (filename, "r"); | |
4912 | if (!f) | |
4913 | return -1; | |
4914 | ||
4915 | for (;;) | |
4916 | { | |
4917 | int n; | |
4918 | content = realloc (content, content_read + 1024); | |
4919 | n = fread (content + content_read, 1, 1024, f); | |
4920 | content_read += n; | |
4921 | if (n < 1024) | |
4922 | { | |
4923 | content[content_read] = '\0'; | |
4924 | break; | |
4925 | } | |
4926 | } | |
4927 | ||
4928 | p = strchr (content, '('); | |
dc146f7c | 4929 | |
ca2a87a0 JK |
4930 | /* Skip ")". */ |
4931 | if (p != NULL) | |
4932 | p = strchr (p, ')'); | |
4933 | if (p != NULL) | |
4934 | p++; | |
4935 | ||
4936 | /* If the first field after program name has index 0, then core number is | |
4937 | the field with index 36. There's no constant for that anywhere. */ | |
4938 | if (p != NULL) | |
4939 | p = strtok_r (p, " ", &ts); | |
4940 | for (i = 0; p != NULL && i != 36; ++i) | |
dc146f7c VP |
4941 | p = strtok_r (NULL, " ", &ts); |
4942 | ||
ca2a87a0 | 4943 | if (p == NULL || sscanf (p, "%d", &core) == 0) |
dc146f7c VP |
4944 | core = -1; |
4945 | ||
4946 | free (content); | |
4947 | fclose (f); | |
4948 | ||
4949 | return core; | |
4950 | } | |
4951 | ||
1570b33e L |
4952 | static void |
4953 | linux_process_qsupported (const char *query) | |
4954 | { | |
4955 | if (the_low_target.process_qsupported != NULL) | |
4956 | the_low_target.process_qsupported (query); | |
4957 | } | |
4958 | ||
219f2f23 PA |
4959 | static int |
4960 | linux_supports_tracepoints (void) | |
4961 | { | |
4962 | if (*the_low_target.supports_tracepoints == NULL) | |
4963 | return 0; | |
4964 | ||
4965 | return (*the_low_target.supports_tracepoints) (); | |
4966 | } | |
4967 | ||
4968 | static CORE_ADDR | |
4969 | linux_read_pc (struct regcache *regcache) | |
4970 | { | |
4971 | if (the_low_target.get_pc == NULL) | |
4972 | return 0; | |
4973 | ||
4974 | return (*the_low_target.get_pc) (regcache); | |
4975 | } | |
4976 | ||
4977 | static void | |
4978 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
4979 | { | |
4980 | gdb_assert (the_low_target.set_pc != NULL); | |
4981 | ||
4982 | (*the_low_target.set_pc) (regcache, pc); | |
4983 | } | |
4984 | ||
8336d594 PA |
4985 | static int |
4986 | linux_thread_stopped (struct thread_info *thread) | |
4987 | { | |
4988 | return get_thread_lwp (thread)->stopped; | |
4989 | } | |
4990 | ||
4991 | /* This exposes stop-all-threads functionality to other modules. */ | |
4992 | ||
4993 | static void | |
7984d532 | 4994 | linux_pause_all (int freeze) |
8336d594 | 4995 | { |
7984d532 PA |
4996 | stop_all_lwps (freeze, NULL); |
4997 | } | |
4998 | ||
4999 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5000 | modules. */ | |
5001 | ||
5002 | static void | |
5003 | linux_unpause_all (int unfreeze) | |
5004 | { | |
5005 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5006 | } |
5007 | ||
fa593d66 PA |
5008 | static int |
5009 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5010 | CORE_ADDR collector, | |
5011 | CORE_ADDR lockaddr, | |
5012 | ULONGEST orig_size, | |
5013 | CORE_ADDR *jump_entry, | |
5014 | unsigned char *jjump_pad_insn, | |
5015 | ULONGEST *jjump_pad_insn_size, | |
5016 | CORE_ADDR *adjusted_insn_addr, | |
5017 | CORE_ADDR *adjusted_insn_addr_end) | |
5018 | { | |
5019 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5020 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
5021 | jump_entry, jjump_pad_insn, jjump_pad_insn_size, | |
5022 | adjusted_insn_addr, adjusted_insn_addr_end); | |
5023 | } | |
5024 | ||
6a271cae PA |
5025 | static struct emit_ops * |
5026 | linux_emit_ops (void) | |
5027 | { | |
5028 | if (the_low_target.emit_ops != NULL) | |
5029 | return (*the_low_target.emit_ops) (); | |
5030 | else | |
5031 | return NULL; | |
5032 | } | |
5033 | ||
ce3a066d DJ |
5034 | static struct target_ops linux_target_ops = { |
5035 | linux_create_inferior, | |
5036 | linux_attach, | |
5037 | linux_kill, | |
6ad8ae5c | 5038 | linux_detach, |
8336d594 | 5039 | linux_mourn, |
444d6139 | 5040 | linux_join, |
ce3a066d DJ |
5041 | linux_thread_alive, |
5042 | linux_resume, | |
5043 | linux_wait, | |
5044 | linux_fetch_registers, | |
5045 | linux_store_registers, | |
5046 | linux_read_memory, | |
5047 | linux_write_memory, | |
2f2893d9 | 5048 | linux_look_up_symbols, |
ef57601b | 5049 | linux_request_interrupt, |
aa691b87 | 5050 | linux_read_auxv, |
d993e290 PA |
5051 | linux_insert_point, |
5052 | linux_remove_point, | |
e013ee27 OF |
5053 | linux_stopped_by_watchpoint, |
5054 | linux_stopped_data_address, | |
42c81e2a | 5055 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 5056 | linux_read_offsets, |
dae5f5cf DJ |
5057 | #else |
5058 | NULL, | |
5059 | #endif | |
5060 | #ifdef USE_THREAD_DB | |
5061 | thread_db_get_tls_address, | |
5062 | #else | |
5063 | NULL, | |
52fb6437 | 5064 | #endif |
efcbbd14 | 5065 | linux_qxfer_spu, |
59a016f0 | 5066 | hostio_last_error_from_errno, |
07e059b5 | 5067 | linux_qxfer_osdata, |
4aa995e1 | 5068 | linux_xfer_siginfo, |
bd99dc85 PA |
5069 | linux_supports_non_stop, |
5070 | linux_async, | |
5071 | linux_start_non_stop, | |
cdbfd419 PP |
5072 | linux_supports_multi_process, |
5073 | #ifdef USE_THREAD_DB | |
dc146f7c | 5074 | thread_db_handle_monitor_command, |
cdbfd419 | 5075 | #else |
dc146f7c | 5076 | NULL, |
cdbfd419 | 5077 | #endif |
1570b33e | 5078 | linux_core_of_thread, |
219f2f23 PA |
5079 | linux_process_qsupported, |
5080 | linux_supports_tracepoints, | |
5081 | linux_read_pc, | |
8336d594 PA |
5082 | linux_write_pc, |
5083 | linux_thread_stopped, | |
7984d532 | 5084 | NULL, |
711e434b | 5085 | linux_pause_all, |
7984d532 | 5086 | linux_unpause_all, |
fa593d66 PA |
5087 | linux_cancel_breakpoints, |
5088 | linux_stabilize_threads, | |
6a271cae PA |
5089 | linux_install_fast_tracepoint_jump_pad, |
5090 | linux_emit_ops | |
ce3a066d DJ |
5091 | }; |
5092 | ||
0d62e5e8 DJ |
5093 | static void |
5094 | linux_init_signals () | |
5095 | { | |
5096 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5097 | to find what the cancel signal actually is. */ | |
60c3d7b0 | 5098 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5099 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5100 | #endif |
0d62e5e8 DJ |
5101 | } |
5102 | ||
da6d8c04 DJ |
5103 | void |
5104 | initialize_low (void) | |
5105 | { | |
bd99dc85 PA |
5106 | struct sigaction sigchld_action; |
5107 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5108 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5109 | set_breakpoint_data (the_low_target.breakpoint, |
5110 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5111 | linux_init_signals (); |
24a09b5f | 5112 | linux_test_for_tracefork (); |
52fa2412 UW |
5113 | #ifdef HAVE_LINUX_REGSETS |
5114 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
5115 | ; | |
bca929d3 | 5116 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 5117 | #endif |
bd99dc85 PA |
5118 | |
5119 | sigchld_action.sa_handler = sigchld_handler; | |
5120 | sigemptyset (&sigchld_action.sa_mask); | |
5121 | sigchld_action.sa_flags = SA_RESTART; | |
5122 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 5123 | } |