Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
545587ee | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
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> | |
957f3f49 DE |
42 | #ifndef ELFMAG0 |
43 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
44 | then ELFMAG0 will have been defined. If it didn't get included by | |
45 | gdb_proc_service.h then including it will likely introduce a duplicate | |
46 | definition of elf_fpregset_t. */ | |
47 | #include <elf.h> | |
48 | #endif | |
efcbbd14 UW |
49 | |
50 | #ifndef SPUFS_MAGIC | |
51 | #define SPUFS_MAGIC 0x23c9b64e | |
52 | #endif | |
da6d8c04 | 53 | |
32ca6d61 DJ |
54 | #ifndef PTRACE_GETSIGINFO |
55 | # define PTRACE_GETSIGINFO 0x4202 | |
56 | # define PTRACE_SETSIGINFO 0x4203 | |
57 | #endif | |
58 | ||
fd462a61 DJ |
59 | #ifndef O_LARGEFILE |
60 | #define O_LARGEFILE 0 | |
61 | #endif | |
62 | ||
24a09b5f DJ |
63 | /* If the system headers did not provide the constants, hard-code the normal |
64 | values. */ | |
65 | #ifndef PTRACE_EVENT_FORK | |
66 | ||
67 | #define PTRACE_SETOPTIONS 0x4200 | |
68 | #define PTRACE_GETEVENTMSG 0x4201 | |
69 | ||
70 | /* options set using PTRACE_SETOPTIONS */ | |
71 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
72 | #define PTRACE_O_TRACEFORK 0x00000002 | |
73 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
74 | #define PTRACE_O_TRACECLONE 0x00000008 | |
75 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
76 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 | |
77 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
78 | ||
79 | /* Wait extended result codes for the above trace options. */ | |
80 | #define PTRACE_EVENT_FORK 1 | |
81 | #define PTRACE_EVENT_VFORK 2 | |
82 | #define PTRACE_EVENT_CLONE 3 | |
83 | #define PTRACE_EVENT_EXEC 4 | |
84 | #define PTRACE_EVENT_VFORK_DONE 5 | |
85 | #define PTRACE_EVENT_EXIT 6 | |
86 | ||
87 | #endif /* PTRACE_EVENT_FORK */ | |
88 | ||
89 | /* We can't always assume that this flag is available, but all systems | |
90 | with the ptrace event handlers also have __WALL, so it's safe to use | |
91 | in some contexts. */ | |
92 | #ifndef __WALL | |
93 | #define __WALL 0x40000000 /* Wait for any child. */ | |
94 | #endif | |
95 | ||
ec8ebe72 DE |
96 | #ifndef W_STOPCODE |
97 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
98 | #endif | |
99 | ||
42c81e2a DJ |
100 | #ifdef __UCLIBC__ |
101 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
102 | #define HAS_NOMMU | |
103 | #endif | |
104 | #endif | |
105 | ||
24a09b5f DJ |
106 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
107 | representation of the thread ID. | |
611cb4a5 | 108 | |
54a0b537 | 109 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
110 | the same as the LWP ID. |
111 | ||
112 | ``all_processes'' is keyed by the "overall process ID", which | |
113 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 114 | |
54a0b537 | 115 | struct inferior_list all_lwps; |
0d62e5e8 | 116 | |
24a09b5f DJ |
117 | /* A list of all unknown processes which receive stop signals. Some other |
118 | process will presumably claim each of these as forked children | |
119 | momentarily. */ | |
120 | ||
121 | struct inferior_list stopped_pids; | |
122 | ||
0d62e5e8 DJ |
123 | /* FIXME this is a bit of a hack, and could be removed. */ |
124 | int stopping_threads; | |
125 | ||
126 | /* FIXME make into a target method? */ | |
24a09b5f | 127 | int using_threads = 1; |
24a09b5f | 128 | |
95954743 PA |
129 | /* This flag is true iff we've just created or attached to our first |
130 | inferior but it has not stopped yet. As soon as it does, we need | |
131 | to call the low target's arch_setup callback. Doing this only on | |
132 | the first inferior avoids reinializing the architecture on every | |
133 | inferior, and avoids messing with the register caches of the | |
134 | already running inferiors. NOTE: this assumes all inferiors under | |
135 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
136 | static int new_inferior; |
137 | ||
2acc282a | 138 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 139 | int step, int signal, siginfo_t *info); |
2bd7c093 | 140 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
54a0b537 | 141 | static void stop_all_lwps (void); |
95954743 | 142 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 143 | static void *add_lwp (ptid_t ptid); |
c35fafde | 144 | static int linux_stopped_by_watchpoint (void); |
95954743 | 145 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
dc146f7c | 146 | static int linux_core_of_thread (ptid_t ptid); |
d50171e4 PA |
147 | static void proceed_all_lwps (void); |
148 | static void unstop_all_lwps (struct lwp_info *except); | |
149 | static void cancel_finished_single_steps (struct lwp_info *except); | |
150 | static int finish_step_over (struct lwp_info *lwp); | |
151 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
152 | static int kill_lwp (unsigned long lwpid, int signo); | |
153 | ||
154 | /* True if the low target can hardware single-step. Such targets | |
155 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
156 | ||
157 | static int | |
158 | can_hardware_single_step (void) | |
159 | { | |
160 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
161 | } | |
162 | ||
163 | /* True if the low target supports memory breakpoints. If so, we'll | |
164 | have a GET_PC implementation. */ | |
165 | ||
166 | static int | |
167 | supports_breakpoints (void) | |
168 | { | |
169 | return (the_low_target.get_pc != NULL); | |
170 | } | |
0d62e5e8 DJ |
171 | |
172 | struct pending_signals | |
173 | { | |
174 | int signal; | |
32ca6d61 | 175 | siginfo_t info; |
0d62e5e8 DJ |
176 | struct pending_signals *prev; |
177 | }; | |
611cb4a5 | 178 | |
14ce3065 DE |
179 | #define PTRACE_ARG3_TYPE void * |
180 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 181 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 182 | |
58caa3dc | 183 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
184 | static char *disabled_regsets; |
185 | static int num_regsets; | |
58caa3dc DJ |
186 | #endif |
187 | ||
bd99dc85 PA |
188 | /* The read/write ends of the pipe registered as waitable file in the |
189 | event loop. */ | |
190 | static int linux_event_pipe[2] = { -1, -1 }; | |
191 | ||
192 | /* True if we're currently in async mode. */ | |
193 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
194 | ||
195 | static void send_sigstop (struct inferior_list_entry *entry); | |
196 | static void wait_for_sigstop (struct inferior_list_entry *entry); | |
197 | ||
d0722149 DE |
198 | /* Accepts an integer PID; Returns a string representing a file that |
199 | can be opened to get info for the child process. | |
200 | Space for the result is malloc'd, caller must free. */ | |
201 | ||
202 | char * | |
203 | linux_child_pid_to_exec_file (int pid) | |
204 | { | |
205 | char *name1, *name2; | |
206 | ||
207 | name1 = xmalloc (MAXPATHLEN); | |
208 | name2 = xmalloc (MAXPATHLEN); | |
209 | memset (name2, 0, MAXPATHLEN); | |
210 | ||
211 | sprintf (name1, "/proc/%d/exe", pid); | |
212 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
213 | { | |
214 | free (name1); | |
215 | return name2; | |
216 | } | |
217 | else | |
218 | { | |
219 | free (name2); | |
220 | return name1; | |
221 | } | |
222 | } | |
223 | ||
224 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
225 | ||
226 | static int | |
957f3f49 | 227 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
228 | { |
229 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
230 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
231 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
232 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
233 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
234 | } | |
235 | ||
236 | /* Return non-zero if FILE is a 64-bit ELF file, | |
237 | zero if the file is not a 64-bit ELF file, | |
238 | and -1 if the file is not accessible or doesn't exist. */ | |
239 | ||
240 | int | |
241 | elf_64_file_p (const char *file) | |
242 | { | |
957f3f49 | 243 | Elf64_Ehdr header; |
d0722149 DE |
244 | int fd; |
245 | ||
246 | fd = open (file, O_RDONLY); | |
247 | if (fd < 0) | |
248 | return -1; | |
249 | ||
250 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
251 | { | |
252 | close (fd); | |
253 | return 0; | |
254 | } | |
255 | close (fd); | |
256 | ||
257 | return elf_64_header_p (&header); | |
258 | } | |
259 | ||
bd99dc85 PA |
260 | static void |
261 | delete_lwp (struct lwp_info *lwp) | |
262 | { | |
263 | remove_thread (get_lwp_thread (lwp)); | |
264 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 265 | free (lwp->arch_private); |
bd99dc85 PA |
266 | free (lwp); |
267 | } | |
268 | ||
95954743 PA |
269 | /* Add a process to the common process list, and set its private |
270 | data. */ | |
271 | ||
272 | static struct process_info * | |
273 | linux_add_process (int pid, int attached) | |
274 | { | |
275 | struct process_info *proc; | |
276 | ||
277 | /* Is this the first process? If so, then set the arch. */ | |
278 | if (all_processes.head == NULL) | |
279 | new_inferior = 1; | |
280 | ||
281 | proc = add_process (pid, attached); | |
282 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
283 | ||
aa5ca48f DE |
284 | if (the_low_target.new_process != NULL) |
285 | proc->private->arch_private = the_low_target.new_process (); | |
286 | ||
95954743 PA |
287 | return proc; |
288 | } | |
289 | ||
5091eb23 DE |
290 | /* Remove a process from the common process list, |
291 | also freeing all private data. */ | |
292 | ||
293 | static void | |
ca5c370d | 294 | linux_remove_process (struct process_info *process) |
5091eb23 | 295 | { |
cdbfd419 PP |
296 | struct process_info_private *priv = process->private; |
297 | ||
cdbfd419 PP |
298 | free (priv->arch_private); |
299 | free (priv); | |
5091eb23 DE |
300 | remove_process (process); |
301 | } | |
302 | ||
07d4f67e DE |
303 | /* Wrapper function for waitpid which handles EINTR, and emulates |
304 | __WALL for systems where that is not available. */ | |
305 | ||
306 | static int | |
307 | my_waitpid (int pid, int *status, int flags) | |
308 | { | |
309 | int ret, out_errno; | |
310 | ||
311 | if (debug_threads) | |
312 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
313 | ||
314 | if (flags & __WALL) | |
315 | { | |
316 | sigset_t block_mask, org_mask, wake_mask; | |
317 | int wnohang; | |
318 | ||
319 | wnohang = (flags & WNOHANG) != 0; | |
320 | flags &= ~(__WALL | __WCLONE); | |
321 | flags |= WNOHANG; | |
322 | ||
323 | /* Block all signals while here. This avoids knowing about | |
324 | LinuxThread's signals. */ | |
325 | sigfillset (&block_mask); | |
326 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
327 | ||
328 | /* ... except during the sigsuspend below. */ | |
329 | sigemptyset (&wake_mask); | |
330 | ||
331 | while (1) | |
332 | { | |
333 | /* Since all signals are blocked, there's no need to check | |
334 | for EINTR here. */ | |
335 | ret = waitpid (pid, status, flags); | |
336 | out_errno = errno; | |
337 | ||
338 | if (ret == -1 && out_errno != ECHILD) | |
339 | break; | |
340 | else if (ret > 0) | |
341 | break; | |
342 | ||
343 | if (flags & __WCLONE) | |
344 | { | |
345 | /* We've tried both flavors now. If WNOHANG is set, | |
346 | there's nothing else to do, just bail out. */ | |
347 | if (wnohang) | |
348 | break; | |
349 | ||
350 | if (debug_threads) | |
351 | fprintf (stderr, "blocking\n"); | |
352 | ||
353 | /* Block waiting for signals. */ | |
354 | sigsuspend (&wake_mask); | |
355 | } | |
356 | ||
357 | flags ^= __WCLONE; | |
358 | } | |
359 | ||
360 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
361 | } | |
362 | else | |
363 | { | |
364 | do | |
365 | ret = waitpid (pid, status, flags); | |
366 | while (ret == -1 && errno == EINTR); | |
367 | out_errno = errno; | |
368 | } | |
369 | ||
370 | if (debug_threads) | |
371 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
372 | pid, flags, status ? *status : -1, ret); | |
373 | ||
374 | errno = out_errno; | |
375 | return ret; | |
376 | } | |
377 | ||
bd99dc85 PA |
378 | /* Handle a GNU/Linux extended wait response. If we see a clone |
379 | event, we need to add the new LWP to our list (and not report the | |
380 | trap to higher layers). */ | |
0d62e5e8 | 381 | |
24a09b5f | 382 | static void |
54a0b537 | 383 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
384 | { |
385 | int event = wstat >> 16; | |
54a0b537 | 386 | struct lwp_info *new_lwp; |
24a09b5f DJ |
387 | |
388 | if (event == PTRACE_EVENT_CLONE) | |
389 | { | |
95954743 | 390 | ptid_t ptid; |
24a09b5f | 391 | unsigned long new_pid; |
836acd6d | 392 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 393 | |
bd99dc85 | 394 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
395 | |
396 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
397 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
398 | { | |
399 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
400 | hits the SIGSTOP, but we're already attached. */ | |
401 | ||
97438e3f | 402 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
403 | |
404 | if (ret == -1) | |
405 | perror_with_name ("waiting for new child"); | |
406 | else if (ret != new_pid) | |
407 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 408 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
409 | warning ("wait returned unexpected status 0x%x", status); |
410 | } | |
411 | ||
14ce3065 | 412 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); |
24a09b5f | 413 | |
95954743 PA |
414 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
415 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
416 | add_thread (ptid, new_lwp); | |
24a09b5f | 417 | |
e27d73f6 DE |
418 | /* Either we're going to immediately resume the new thread |
419 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
420 | thinks the thread is currently running, so set this first | |
421 | before calling linux_resume_one_lwp. */ | |
422 | new_lwp->stopped = 1; | |
423 | ||
da5898ce DJ |
424 | /* Normally we will get the pending SIGSTOP. But in some cases |
425 | we might get another signal delivered to the group first. | |
f21cc1a2 | 426 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
427 | if (WSTOPSIG (status) == SIGSTOP) |
428 | { | |
d50171e4 PA |
429 | if (stopping_threads) |
430 | new_lwp->stop_pc = get_stop_pc (new_lwp); | |
431 | else | |
e27d73f6 | 432 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 433 | } |
24a09b5f | 434 | else |
da5898ce | 435 | { |
54a0b537 | 436 | new_lwp->stop_expected = 1; |
d50171e4 | 437 | |
da5898ce DJ |
438 | if (stopping_threads) |
439 | { | |
d50171e4 | 440 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
441 | new_lwp->status_pending_p = 1; |
442 | new_lwp->status_pending = status; | |
da5898ce DJ |
443 | } |
444 | else | |
445 | /* Pass the signal on. This is what GDB does - except | |
446 | shouldn't we really report it instead? */ | |
e27d73f6 | 447 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 448 | } |
24a09b5f DJ |
449 | |
450 | /* Always resume the current thread. If we are stopping | |
451 | threads, it will have a pending SIGSTOP; we may as well | |
452 | collect it now. */ | |
2acc282a | 453 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
454 | } |
455 | } | |
456 | ||
d50171e4 PA |
457 | /* Return the PC as read from the regcache of LWP, without any |
458 | adjustment. */ | |
459 | ||
460 | static CORE_ADDR | |
461 | get_pc (struct lwp_info *lwp) | |
462 | { | |
463 | struct thread_info *saved_inferior; | |
464 | struct regcache *regcache; | |
465 | CORE_ADDR pc; | |
466 | ||
467 | if (the_low_target.get_pc == NULL) | |
468 | return 0; | |
469 | ||
470 | saved_inferior = current_inferior; | |
471 | current_inferior = get_lwp_thread (lwp); | |
472 | ||
473 | regcache = get_thread_regcache (current_inferior, 1); | |
474 | pc = (*the_low_target.get_pc) (regcache); | |
475 | ||
476 | if (debug_threads) | |
477 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
478 | ||
479 | current_inferior = saved_inferior; | |
480 | return pc; | |
481 | } | |
482 | ||
483 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
484 | The SIGTRAP could mean several things. |
485 | ||
486 | On i386, where decr_pc_after_break is non-zero: | |
487 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
488 | we will get only the one SIGTRAP (even if the instruction we | |
489 | stepped over was a breakpoint). The value of $eip will be the | |
490 | next instruction. | |
491 | If we continue the process using PTRACE_CONT, we will get a | |
492 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
493 | the instruction after the breakpoint (i.e. needs to be | |
494 | decremented). If we report the SIGTRAP to GDB, we must also | |
495 | report the undecremented PC. If we cancel the SIGTRAP, we | |
496 | must resume at the decremented PC. | |
497 | ||
498 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
499 | with hardware or kernel single-step: | |
500 | If we single-step over a breakpoint instruction, our PC will | |
501 | point at the following instruction. If we continue and hit a | |
502 | breakpoint instruction, our PC will point at the breakpoint | |
503 | instruction. */ | |
504 | ||
505 | static CORE_ADDR | |
d50171e4 | 506 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 507 | { |
d50171e4 PA |
508 | CORE_ADDR stop_pc; |
509 | ||
510 | if (the_low_target.get_pc == NULL) | |
511 | return 0; | |
0d62e5e8 | 512 | |
d50171e4 PA |
513 | stop_pc = get_pc (lwp); |
514 | ||
515 | if (WSTOPSIG (lwp->last_status) == SIGTRAP && !lwp->stepping) | |
47c0c975 DE |
516 | stop_pc -= the_low_target.decr_pc_after_break; |
517 | ||
518 | if (debug_threads) | |
519 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
520 | ||
521 | return stop_pc; | |
0d62e5e8 | 522 | } |
ce3a066d | 523 | |
0d62e5e8 | 524 | static void * |
95954743 | 525 | add_lwp (ptid_t ptid) |
611cb4a5 | 526 | { |
54a0b537 | 527 | struct lwp_info *lwp; |
0d62e5e8 | 528 | |
54a0b537 PA |
529 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
530 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 531 | |
95954743 | 532 | lwp->head.id = ptid; |
0d62e5e8 | 533 | |
d50171e4 PA |
534 | lwp->last_resume_kind = resume_continue; |
535 | ||
aa5ca48f DE |
536 | if (the_low_target.new_thread != NULL) |
537 | lwp->arch_private = the_low_target.new_thread (); | |
538 | ||
54a0b537 | 539 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 540 | |
54a0b537 | 541 | return lwp; |
0d62e5e8 | 542 | } |
611cb4a5 | 543 | |
da6d8c04 DJ |
544 | /* Start an inferior process and returns its pid. |
545 | ALLARGS is a vector of program-name and args. */ | |
546 | ||
ce3a066d DJ |
547 | static int |
548 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 549 | { |
a6dbe5df | 550 | struct lwp_info *new_lwp; |
da6d8c04 | 551 | int pid; |
95954743 | 552 | ptid_t ptid; |
da6d8c04 | 553 | |
42c81e2a | 554 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
555 | pid = vfork (); |
556 | #else | |
da6d8c04 | 557 | pid = fork (); |
52fb6437 | 558 | #endif |
da6d8c04 DJ |
559 | if (pid < 0) |
560 | perror_with_name ("fork"); | |
561 | ||
562 | if (pid == 0) | |
563 | { | |
564 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
565 | ||
60c3d7b0 | 566 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 567 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 568 | #endif |
0d62e5e8 | 569 | |
a9fa9f7d DJ |
570 | setpgid (0, 0); |
571 | ||
2b876972 DJ |
572 | execv (program, allargs); |
573 | if (errno == ENOENT) | |
574 | execvp (program, allargs); | |
da6d8c04 DJ |
575 | |
576 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 577 | strerror (errno)); |
da6d8c04 DJ |
578 | fflush (stderr); |
579 | _exit (0177); | |
580 | } | |
581 | ||
95954743 PA |
582 | linux_add_process (pid, 0); |
583 | ||
584 | ptid = ptid_build (pid, pid, 0); | |
585 | new_lwp = add_lwp (ptid); | |
586 | add_thread (ptid, new_lwp); | |
a6dbe5df | 587 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 588 | |
a9fa9f7d | 589 | return pid; |
da6d8c04 DJ |
590 | } |
591 | ||
592 | /* Attach to an inferior process. */ | |
593 | ||
95954743 PA |
594 | static void |
595 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 596 | { |
95954743 | 597 | ptid_t ptid; |
54a0b537 | 598 | struct lwp_info *new_lwp; |
611cb4a5 | 599 | |
95954743 | 600 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 601 | { |
95954743 | 602 | if (!initial) |
2d717e4f DJ |
603 | { |
604 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 605 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
606 | strerror (errno), errno); |
607 | fflush (stderr); | |
608 | return; | |
609 | } | |
610 | else | |
611 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 612 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 613 | strerror (errno), errno); |
da6d8c04 DJ |
614 | } |
615 | ||
95954743 PA |
616 | if (initial) |
617 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
618 | ptid = ptid_build (lwpid, lwpid, 0); | |
619 | else | |
620 | { | |
621 | /* Note that extracting the pid from the current inferior is | |
622 | safe, since we're always called in the context of the same | |
623 | process as this new thread. */ | |
624 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
625 | ptid = ptid_build (pid, lwpid, 0); | |
626 | } | |
24a09b5f | 627 | |
95954743 PA |
628 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
629 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 630 | |
a6dbe5df PA |
631 | /* We need to wait for SIGSTOP before being able to make the next |
632 | ptrace call on this LWP. */ | |
633 | new_lwp->must_set_ptrace_flags = 1; | |
634 | ||
0d62e5e8 | 635 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
636 | brings it to a halt. |
637 | ||
638 | There are several cases to consider here: | |
639 | ||
640 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 641 | of a new thread that is being created. |
d50171e4 PA |
642 | In this case we should ignore that SIGSTOP and resume the |
643 | process. This is handled below by setting stop_expected = 1, | |
644 | and the fact that add_lwp sets last_resume_kind == | |
645 | resume_continue. | |
0e21c1ec DE |
646 | |
647 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
648 | to it via attach_inferior. |
649 | In this case we want the process thread to stop. | |
d50171e4 PA |
650 | This is handled by having linux_attach set last_resume_kind == |
651 | resume_stop after we return. | |
1b3f6016 PA |
652 | ??? If the process already has several threads we leave the other |
653 | threads running. | |
0e21c1ec DE |
654 | |
655 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
656 | existing threads. |
657 | In this case we want the thread to stop. | |
658 | FIXME: This case is currently not properly handled. | |
659 | We should wait for the SIGSTOP but don't. Things work apparently | |
660 | because enough time passes between when we ptrace (ATTACH) and when | |
661 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
662 | |
663 | On the other hand, if we are currently trying to stop all threads, we | |
664 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 665 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
666 | end of the list, and so the new thread has not yet reached |
667 | wait_for_sigstop (but will). */ | |
d50171e4 | 668 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
669 | } |
670 | ||
95954743 PA |
671 | void |
672 | linux_attach_lwp (unsigned long lwpid) | |
673 | { | |
674 | linux_attach_lwp_1 (lwpid, 0); | |
675 | } | |
676 | ||
0d62e5e8 | 677 | int |
a1928bad | 678 | linux_attach (unsigned long pid) |
0d62e5e8 | 679 | { |
54a0b537 | 680 | struct lwp_info *lwp; |
0d62e5e8 | 681 | |
95954743 PA |
682 | linux_attach_lwp_1 (pid, 1); |
683 | ||
684 | linux_add_process (pid, 1); | |
0d62e5e8 | 685 | |
bd99dc85 PA |
686 | if (!non_stop) |
687 | { | |
688 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
689 | process. It will be collected by wait shortly. */ | |
95954743 PA |
690 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
691 | ptid_build (pid, pid, 0)); | |
d50171e4 | 692 | lwp->last_resume_kind = resume_stop; |
bd99dc85 | 693 | } |
0d62e5e8 | 694 | |
95954743 PA |
695 | return 0; |
696 | } | |
697 | ||
698 | struct counter | |
699 | { | |
700 | int pid; | |
701 | int count; | |
702 | }; | |
703 | ||
704 | static int | |
705 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
706 | { | |
707 | struct counter *counter = args; | |
708 | ||
709 | if (ptid_get_pid (entry->id) == counter->pid) | |
710 | { | |
711 | if (++counter->count > 1) | |
712 | return 1; | |
713 | } | |
d61ddec4 | 714 | |
da6d8c04 DJ |
715 | return 0; |
716 | } | |
717 | ||
95954743 PA |
718 | static int |
719 | last_thread_of_process_p (struct thread_info *thread) | |
720 | { | |
721 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
722 | int pid = ptid_get_pid (ptid); | |
723 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 724 | |
95954743 PA |
725 | return (find_inferior (&all_threads, |
726 | second_thread_of_pid_p, &counter) == NULL); | |
727 | } | |
728 | ||
729 | /* Kill the inferior lwp. */ | |
730 | ||
731 | static int | |
732 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 733 | { |
0d62e5e8 | 734 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 735 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 736 | int wstat; |
95954743 PA |
737 | int pid = * (int *) args; |
738 | ||
739 | if (ptid_get_pid (entry->id) != pid) | |
740 | return 0; | |
0d62e5e8 | 741 | |
fd500816 DJ |
742 | /* We avoid killing the first thread here, because of a Linux kernel (at |
743 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
744 | the children get a chance to be reaped, it will remain a zombie | |
745 | forever. */ | |
95954743 | 746 | |
12b42a12 | 747 | if (lwpid_of (lwp) == pid) |
95954743 PA |
748 | { |
749 | if (debug_threads) | |
750 | fprintf (stderr, "lkop: is last of process %s\n", | |
751 | target_pid_to_str (entry->id)); | |
752 | return 0; | |
753 | } | |
fd500816 | 754 | |
bd99dc85 PA |
755 | /* If we're killing a running inferior, make sure it is stopped |
756 | first, as PTRACE_KILL will not work otherwise. */ | |
757 | if (!lwp->stopped) | |
758 | send_sigstop (&lwp->head); | |
759 | ||
0d62e5e8 DJ |
760 | do |
761 | { | |
bd99dc85 | 762 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
763 | |
764 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 765 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 766 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
767 | |
768 | return 0; | |
da6d8c04 DJ |
769 | } |
770 | ||
95954743 PA |
771 | static int |
772 | linux_kill (int pid) | |
0d62e5e8 | 773 | { |
95954743 | 774 | struct process_info *process; |
54a0b537 | 775 | struct lwp_info *lwp; |
95954743 | 776 | struct thread_info *thread; |
fd500816 | 777 | int wstat; |
95954743 | 778 | int lwpid; |
fd500816 | 779 | |
95954743 PA |
780 | process = find_process_pid (pid); |
781 | if (process == NULL) | |
782 | return -1; | |
9d606399 | 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 PA |
794 | |
795 | /* If we're killing a running inferior, make sure it is stopped | |
796 | first, as PTRACE_KILL will not work otherwise. */ | |
797 | if (!lwp->stopped) | |
798 | send_sigstop (&lwp->head); | |
799 | ||
fd500816 DJ |
800 | do |
801 | { | |
bd99dc85 | 802 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
803 | |
804 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
805 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
806 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 807 | |
ca5c370d PA |
808 | #ifdef USE_THREAD_DB |
809 | thread_db_free (process, 0); | |
810 | #endif | |
bd99dc85 | 811 | delete_lwp (lwp); |
ca5c370d | 812 | linux_remove_process (process); |
95954743 | 813 | return 0; |
0d62e5e8 DJ |
814 | } |
815 | ||
95954743 PA |
816 | static int |
817 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
818 | { |
819 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 820 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
821 | int pid = * (int *) args; |
822 | ||
823 | if (ptid_get_pid (entry->id) != pid) | |
824 | return 0; | |
6ad8ae5c | 825 | |
bd99dc85 PA |
826 | /* If we're detaching from a running inferior, make sure it is |
827 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
828 | if (!lwp->stopped) | |
829 | { | |
95954743 | 830 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
831 | |
832 | stopping_threads = 1; | |
833 | send_sigstop (&lwp->head); | |
834 | ||
835 | /* If this detects a new thread through a clone event, the new | |
836 | thread is appended to the end of the lwp list, so we'll | |
837 | eventually detach from it. */ | |
838 | wait_for_sigstop (&lwp->head); | |
839 | stopping_threads = 0; | |
840 | ||
841 | /* If LWP exits while we're trying to stop it, there's nothing | |
842 | left to do. */ | |
95954743 | 843 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 844 | if (lwp == NULL) |
95954743 | 845 | return 0; |
bd99dc85 PA |
846 | } |
847 | ||
ae13219e DJ |
848 | /* If this process is stopped but is expecting a SIGSTOP, then make |
849 | sure we take care of that now. This isn't absolutely guaranteed | |
850 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 851 | if (lwp->stop_expected) |
ae13219e | 852 | { |
bd99dc85 | 853 | int wstat; |
ae13219e | 854 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
855 | lwp->stop_expected = 0; |
856 | if (lwp->stopped) | |
2acc282a | 857 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 858 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
859 | } |
860 | ||
861 | /* Flush any pending changes to the process's registers. */ | |
862 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 863 | get_lwp_thread (lwp)); |
ae13219e DJ |
864 | |
865 | /* Finally, let it resume. */ | |
bd99dc85 PA |
866 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
867 | ||
868 | delete_lwp (lwp); | |
95954743 | 869 | return 0; |
6ad8ae5c DJ |
870 | } |
871 | ||
dd6953e1 | 872 | static int |
95954743 | 873 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 874 | { |
95954743 PA |
875 | int *pid_p = args; |
876 | ||
877 | if (ptid_get_pid (entry->id) == *pid_p) | |
878 | return 1; | |
879 | ||
880 | return 0; | |
881 | } | |
882 | ||
883 | static int | |
884 | linux_detach (int pid) | |
885 | { | |
886 | struct process_info *process; | |
887 | ||
888 | process = find_process_pid (pid); | |
889 | if (process == NULL) | |
890 | return -1; | |
891 | ||
ca5c370d PA |
892 | #ifdef USE_THREAD_DB |
893 | thread_db_free (process, 1); | |
894 | #endif | |
895 | ||
95954743 PA |
896 | current_inferior = |
897 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
898 | ||
ae13219e | 899 | delete_all_breakpoints (); |
95954743 | 900 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
ca5c370d | 901 | linux_remove_process (process); |
dd6953e1 | 902 | return 0; |
6ad8ae5c DJ |
903 | } |
904 | ||
444d6139 | 905 | static void |
95954743 | 906 | linux_join (int pid) |
444d6139 | 907 | { |
444d6139 | 908 | int status, ret; |
95954743 | 909 | struct process_info *process; |
bd99dc85 | 910 | |
95954743 PA |
911 | process = find_process_pid (pid); |
912 | if (process == NULL) | |
913 | return; | |
444d6139 PA |
914 | |
915 | do { | |
95954743 | 916 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
917 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
918 | break; | |
919 | } while (ret != -1 || errno != ECHILD); | |
920 | } | |
921 | ||
6ad8ae5c | 922 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 923 | static int |
95954743 | 924 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 925 | { |
95954743 PA |
926 | struct lwp_info *lwp = find_lwp_pid (ptid); |
927 | ||
928 | /* We assume we always know if a thread exits. If a whole process | |
929 | exited but we still haven't been able to report it to GDB, we'll | |
930 | hold on to the last lwp of the dead process. */ | |
931 | if (lwp != NULL) | |
932 | return !lwp->dead; | |
0d62e5e8 DJ |
933 | else |
934 | return 0; | |
935 | } | |
936 | ||
54a0b537 PA |
937 | /* Return 1 if this lwp has an interesting status pending. This |
938 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 939 | static int |
d50171e4 | 940 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 941 | { |
54a0b537 | 942 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 943 | ptid_t ptid = * (ptid_t *) arg; |
d50171e4 | 944 | struct thread_info *thread = get_lwp_thread (lwp); |
95954743 PA |
945 | |
946 | /* Check if we're only interested in events from a specific process | |
947 | or its lwps. */ | |
948 | if (!ptid_equal (minus_one_ptid, ptid) | |
949 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
950 | return 0; | |
0d62e5e8 | 951 | |
d50171e4 PA |
952 | thread = get_lwp_thread (lwp); |
953 | ||
954 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
955 | report any status pending the LWP may have. */ | |
956 | if (lwp->last_resume_kind == resume_stop | |
957 | && thread->last_status.kind == TARGET_WAITKIND_STOPPED) | |
958 | return 0; | |
0d62e5e8 | 959 | |
d50171e4 | 960 | return lwp->status_pending_p; |
0d62e5e8 DJ |
961 | } |
962 | ||
95954743 PA |
963 | static int |
964 | same_lwp (struct inferior_list_entry *entry, void *data) | |
965 | { | |
966 | ptid_t ptid = *(ptid_t *) data; | |
967 | int lwp; | |
968 | ||
969 | if (ptid_get_lwp (ptid) != 0) | |
970 | lwp = ptid_get_lwp (ptid); | |
971 | else | |
972 | lwp = ptid_get_pid (ptid); | |
973 | ||
974 | if (ptid_get_lwp (entry->id) == lwp) | |
975 | return 1; | |
976 | ||
977 | return 0; | |
978 | } | |
979 | ||
980 | struct lwp_info * | |
981 | find_lwp_pid (ptid_t ptid) | |
982 | { | |
983 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
984 | } | |
985 | ||
bd99dc85 | 986 | static struct lwp_info * |
95954743 | 987 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 988 | { |
0d62e5e8 | 989 | int ret; |
95954743 | 990 | int to_wait_for = -1; |
bd99dc85 | 991 | struct lwp_info *child = NULL; |
0d62e5e8 | 992 | |
bd99dc85 | 993 | if (debug_threads) |
95954743 PA |
994 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
995 | ||
996 | if (ptid_equal (ptid, minus_one_ptid)) | |
997 | to_wait_for = -1; /* any child */ | |
998 | else | |
999 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1000 | |
bd99dc85 | 1001 | options |= __WALL; |
0d62e5e8 | 1002 | |
bd99dc85 | 1003 | retry: |
0d62e5e8 | 1004 | |
bd99dc85 PA |
1005 | ret = my_waitpid (to_wait_for, wstatp, options); |
1006 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1007 | return NULL; | |
1008 | else if (ret == -1) | |
1009 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1010 | |
1011 | if (debug_threads | |
1012 | && (!WIFSTOPPED (*wstatp) | |
1013 | || (WSTOPSIG (*wstatp) != 32 | |
1014 | && WSTOPSIG (*wstatp) != 33))) | |
1015 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1016 | ||
95954743 | 1017 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1018 | |
24a09b5f DJ |
1019 | /* If we didn't find a process, one of two things presumably happened: |
1020 | - A process we started and then detached from has exited. Ignore it. | |
1021 | - A process we are controlling has forked and the new child's stop | |
1022 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1023 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1024 | { |
1025 | add_pid_to_list (&stopped_pids, ret); | |
1026 | goto retry; | |
1027 | } | |
bd99dc85 | 1028 | else if (child == NULL) |
24a09b5f DJ |
1029 | goto retry; |
1030 | ||
bd99dc85 | 1031 | child->stopped = 1; |
0d62e5e8 | 1032 | |
bd99dc85 | 1033 | child->last_status = *wstatp; |
32ca6d61 | 1034 | |
d61ddec4 UW |
1035 | /* Architecture-specific setup after inferior is running. |
1036 | This needs to happen after we have attached to the inferior | |
1037 | and it is stopped for the first time, but before we access | |
1038 | any inferior registers. */ | |
1039 | if (new_inferior) | |
1040 | { | |
1041 | the_low_target.arch_setup (); | |
52fa2412 UW |
1042 | #ifdef HAVE_LINUX_REGSETS |
1043 | memset (disabled_regsets, 0, num_regsets); | |
1044 | #endif | |
d61ddec4 UW |
1045 | new_inferior = 0; |
1046 | } | |
1047 | ||
c3adc08c PA |
1048 | /* Fetch the possibly triggered data watchpoint info and store it in |
1049 | CHILD. | |
1050 | ||
1051 | On some archs, like x86, that use debug registers to set | |
1052 | watchpoints, it's possible that the way to know which watched | |
1053 | address trapped, is to check the register that is used to select | |
1054 | which address to watch. Problem is, between setting the | |
1055 | watchpoint and reading back which data address trapped, the user | |
1056 | may change the set of watchpoints, and, as a consequence, GDB | |
1057 | changes the debug registers in the inferior. To avoid reading | |
1058 | back a stale stopped-data-address when that happens, we cache in | |
1059 | LP the fact that a watchpoint trapped, and the corresponding data | |
1060 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1061 | changes the debug registers meanwhile, we have the cached data we | |
1062 | can rely on. */ | |
1063 | ||
1064 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1065 | { | |
1066 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1067 | { | |
1068 | child->stopped_by_watchpoint = 0; | |
1069 | } | |
1070 | else | |
1071 | { | |
1072 | struct thread_info *saved_inferior; | |
1073 | ||
1074 | saved_inferior = current_inferior; | |
1075 | current_inferior = get_lwp_thread (child); | |
1076 | ||
1077 | child->stopped_by_watchpoint | |
1078 | = the_low_target.stopped_by_watchpoint (); | |
1079 | ||
1080 | if (child->stopped_by_watchpoint) | |
1081 | { | |
1082 | if (the_low_target.stopped_data_address != NULL) | |
1083 | child->stopped_data_address | |
1084 | = the_low_target.stopped_data_address (); | |
1085 | else | |
1086 | child->stopped_data_address = 0; | |
1087 | } | |
1088 | ||
1089 | current_inferior = saved_inferior; | |
1090 | } | |
1091 | } | |
1092 | ||
d50171e4 PA |
1093 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1094 | architecture being defined already (so that CHILD has a valid | |
1095 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1096 | not). */ | |
1097 | if (WIFSTOPPED (*wstatp)) | |
1098 | child->stop_pc = get_stop_pc (child); | |
1099 | ||
0d62e5e8 | 1100 | if (debug_threads |
47c0c975 DE |
1101 | && WIFSTOPPED (*wstatp) |
1102 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1103 | { |
896c7fbb | 1104 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1105 | struct regcache *regcache; |
47c0c975 DE |
1106 | CORE_ADDR pc; |
1107 | ||
d50171e4 | 1108 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1109 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1110 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1111 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1112 | current_inferior = saved_inferior; |
0d62e5e8 | 1113 | } |
bd99dc85 PA |
1114 | |
1115 | return child; | |
0d62e5e8 | 1116 | } |
611cb4a5 | 1117 | |
d50171e4 PA |
1118 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1119 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1120 | will handle the current event, eventually we will resume this LWP, | |
1121 | and this breakpoint will trap again. */ | |
1122 | ||
1123 | static int | |
1124 | cancel_breakpoint (struct lwp_info *lwp) | |
1125 | { | |
1126 | struct thread_info *saved_inferior; | |
1127 | struct regcache *regcache; | |
1128 | ||
1129 | /* There's nothing to do if we don't support breakpoints. */ | |
1130 | if (!supports_breakpoints ()) | |
1131 | return 0; | |
1132 | ||
1133 | if (lwp->stepping) | |
1134 | { | |
1135 | if (debug_threads) | |
1136 | fprintf (stderr, | |
1137 | "CB: [%s] is stepping\n", | |
1138 | target_pid_to_str (lwp->head.id)); | |
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1143 | ||
1144 | /* breakpoint_at reads from current inferior. */ | |
1145 | saved_inferior = current_inferior; | |
1146 | current_inferior = get_lwp_thread (lwp); | |
1147 | ||
1148 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1149 | { | |
1150 | if (debug_threads) | |
1151 | fprintf (stderr, | |
1152 | "CB: Push back breakpoint for %s\n", | |
1153 | target_pid_to_str (lwp->head.id)); | |
1154 | ||
1155 | /* Back up the PC if necessary. */ | |
1156 | if (the_low_target.decr_pc_after_break) | |
1157 | { | |
1158 | struct regcache *regcache | |
1159 | = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1160 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); | |
1161 | } | |
1162 | ||
1163 | current_inferior = saved_inferior; | |
1164 | return 1; | |
1165 | } | |
1166 | else | |
1167 | { | |
1168 | if (debug_threads) | |
1169 | fprintf (stderr, | |
1170 | "CB: No breakpoint found at %s for [%s]\n", | |
1171 | paddress (lwp->stop_pc), | |
1172 | target_pid_to_str (lwp->head.id)); | |
1173 | } | |
1174 | ||
1175 | current_inferior = saved_inferior; | |
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | /* When the event-loop is doing a step-over, this points at the thread | |
1180 | being stepped. */ | |
1181 | ptid_t step_over_bkpt; | |
1182 | ||
bd99dc85 PA |
1183 | /* Wait for an event from child PID. If PID is -1, wait for any |
1184 | child. Store the stop status through the status pointer WSTAT. | |
1185 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1186 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1187 | the stopped child otherwise. */ | |
1188 | ||
0d62e5e8 | 1189 | static int |
95954743 | 1190 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 DJ |
1191 | { |
1192 | CORE_ADDR stop_pc; | |
d50171e4 PA |
1193 | struct lwp_info *event_child, *requested_child; |
1194 | ||
1195 | again: | |
1196 | event_child = NULL; | |
1197 | requested_child = NULL; | |
0d62e5e8 | 1198 | |
95954743 | 1199 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1200 | |
95954743 PA |
1201 | if (ptid_equal (ptid, minus_one_ptid) |
1202 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1203 | { |
54a0b537 | 1204 | event_child = (struct lwp_info *) |
d50171e4 | 1205 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1206 | if (debug_threads && event_child) |
bd99dc85 | 1207 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1208 | } |
1209 | else | |
1210 | { | |
95954743 | 1211 | requested_child = find_lwp_pid (ptid); |
d50171e4 PA |
1212 | |
1213 | if (requested_child->status_pending_p) | |
bd99dc85 | 1214 | event_child = requested_child; |
0d62e5e8 | 1215 | } |
611cb4a5 | 1216 | |
0d62e5e8 DJ |
1217 | if (event_child != NULL) |
1218 | { | |
bd99dc85 PA |
1219 | if (debug_threads) |
1220 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1221 | lwpid_of (event_child), event_child->status_pending); | |
1222 | *wstat = event_child->status_pending; | |
1223 | event_child->status_pending_p = 0; | |
1224 | event_child->status_pending = 0; | |
1225 | current_inferior = get_lwp_thread (event_child); | |
1226 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1227 | } |
1228 | ||
1229 | /* We only enter this loop if no process has a pending wait status. Thus | |
1230 | any action taken in response to a wait status inside this loop is | |
1231 | responding as soon as we detect the status, not after any pending | |
1232 | events. */ | |
1233 | while (1) | |
1234 | { | |
d50171e4 PA |
1235 | int step_over_finished = 0; |
1236 | int bp_explains_trap = 0; | |
1237 | int cancel_sigtrap; | |
1238 | ||
1239 | if (ptid_equal (step_over_bkpt, null_ptid)) | |
1240 | event_child = linux_wait_for_lwp (ptid, wstat, options); | |
1241 | else | |
1242 | { | |
1243 | if (debug_threads) | |
1244 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
1245 | target_pid_to_str (step_over_bkpt)); | |
1246 | event_child = linux_wait_for_lwp (step_over_bkpt, | |
1247 | wstat, options & ~WNOHANG); | |
1248 | } | |
0d62e5e8 | 1249 | |
bd99dc85 | 1250 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1251 | { |
1252 | if (debug_threads) | |
1253 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1254 | return 0; | |
1255 | } | |
0d62e5e8 DJ |
1256 | |
1257 | if (event_child == NULL) | |
1258 | error ("event from unknown child"); | |
611cb4a5 | 1259 | |
bd99dc85 | 1260 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1261 | |
89be2091 | 1262 | /* Check for thread exit. */ |
bd99dc85 | 1263 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1264 | { |
89be2091 | 1265 | if (debug_threads) |
95954743 | 1266 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1267 | |
1268 | /* If the last thread is exiting, just return. */ | |
95954743 | 1269 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1270 | { |
1271 | if (debug_threads) | |
95954743 PA |
1272 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1273 | lwpid_of (event_child)); | |
bd99dc85 PA |
1274 | return lwpid_of (event_child); |
1275 | } | |
89be2091 | 1276 | |
bd99dc85 PA |
1277 | if (!non_stop) |
1278 | { | |
1279 | current_inferior = (struct thread_info *) all_threads.head; | |
1280 | if (debug_threads) | |
1281 | fprintf (stderr, "Current inferior is now %ld\n", | |
1282 | lwpid_of (get_thread_lwp (current_inferior))); | |
1283 | } | |
1284 | else | |
1285 | { | |
1286 | current_inferior = NULL; | |
1287 | if (debug_threads) | |
1288 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1289 | } | |
89be2091 DJ |
1290 | |
1291 | /* If we were waiting for this particular child to do something... | |
1292 | well, it did something. */ | |
bd99dc85 | 1293 | if (requested_child != NULL) |
d50171e4 PA |
1294 | { |
1295 | int lwpid = lwpid_of (event_child); | |
1296 | ||
1297 | /* Cancel the step-over operation --- the thread that | |
1298 | started it is gone. */ | |
1299 | if (finish_step_over (event_child)) | |
1300 | unstop_all_lwps (event_child); | |
1301 | delete_lwp (event_child); | |
1302 | return lwpid; | |
1303 | } | |
1304 | ||
1305 | delete_lwp (event_child); | |
89be2091 DJ |
1306 | |
1307 | /* Wait for a more interesting event. */ | |
1308 | continue; | |
1309 | } | |
1310 | ||
a6dbe5df PA |
1311 | if (event_child->must_set_ptrace_flags) |
1312 | { | |
1313 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
14ce3065 | 1314 | 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); |
a6dbe5df PA |
1315 | event_child->must_set_ptrace_flags = 0; |
1316 | } | |
1317 | ||
bd99dc85 PA |
1318 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1319 | && *wstat >> 16 != 0) | |
24a09b5f | 1320 | { |
bd99dc85 | 1321 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1322 | continue; |
1323 | } | |
1324 | ||
89be2091 DJ |
1325 | /* If GDB is not interested in this signal, don't stop other |
1326 | threads, and don't report it to GDB. Just resume the | |
1327 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1328 | signals as well as any that GDB specifically requested we |
1329 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1330 | and do not ignore signals when stepping - they may require | |
1331 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1332 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1333 | thread library? */ | |
bd99dc85 | 1334 | if (WIFSTOPPED (*wstat) |
69f223ed | 1335 | && !event_child->stepping |
24a09b5f | 1336 | && ( |
60c3d7b0 | 1337 | #if defined (USE_THREAD_DB) && defined (__SIGRTMIN) |
cdbfd419 | 1338 | (current_process ()->private->thread_db != NULL |
bd99dc85 PA |
1339 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1340 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1341 | || |
1342 | #endif | |
bd99dc85 | 1343 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
d50171e4 PA |
1344 | && !(WSTOPSIG (*wstat) == SIGSTOP |
1345 | && event_child->stop_expected)))) | |
89be2091 DJ |
1346 | { |
1347 | siginfo_t info, *info_p; | |
1348 | ||
1349 | if (debug_threads) | |
24a09b5f | 1350 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1351 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1352 | |
bd99dc85 | 1353 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1354 | info_p = &info; |
1355 | else | |
1356 | info_p = NULL; | |
d50171e4 | 1357 | linux_resume_one_lwp (event_child, event_child->stepping, |
bd99dc85 | 1358 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1359 | continue; |
0d62e5e8 | 1360 | } |
611cb4a5 | 1361 | |
d50171e4 PA |
1362 | if (WIFSTOPPED (*wstat) |
1363 | && WSTOPSIG (*wstat) == SIGSTOP | |
1364 | && event_child->stop_expected) | |
1365 | { | |
1366 | int should_stop; | |
1367 | ||
1368 | if (debug_threads) | |
1369 | fprintf (stderr, "Expected stop.\n"); | |
1370 | event_child->stop_expected = 0; | |
1371 | ||
1372 | should_stop = (event_child->last_resume_kind == resume_stop | |
1373 | || stopping_threads); | |
1374 | ||
1375 | if (!should_stop) | |
1376 | { | |
1377 | linux_resume_one_lwp (event_child, | |
1378 | event_child->stepping, 0, NULL); | |
1379 | continue; | |
1380 | } | |
1381 | } | |
1382 | ||
1383 | cancel_sigtrap = (stopping_threads | |
1384 | || event_child->last_resume_kind == resume_stop); | |
1385 | ||
1386 | /* Do not allow nested internal breakpoint handling, or leave | |
1387 | the unadjusted PCs visible to GDB. Simply cancel the | |
1388 | breakpoint now, and eventually when the thread is resumed, it | |
1389 | will trap again, if the breakpoint is still there by | |
1390 | then. */ | |
1391 | if (WIFSTOPPED (*wstat) | |
1392 | && WSTOPSIG (*wstat) == SIGTRAP | |
1393 | && cancel_sigtrap) | |
1394 | { | |
1395 | if (debug_threads) | |
1396 | fprintf (stderr, "Got a nested SIGTRAP while stopping threads\n"); | |
1397 | ||
1398 | if (cancel_breakpoint (event_child)) | |
1399 | { | |
1400 | if (debug_threads) | |
1401 | fprintf (stderr, " bkpt canceled\n"); | |
1402 | ||
1403 | /* We don't resume immediately to collect the SIGSTOP, | |
1404 | due to other reasons we may care for this SIGTRAP | |
1405 | below. Care must be taken to not process anything | |
1406 | breakpoint related though from this point on. */ | |
1407 | } | |
1408 | } | |
1409 | ||
1410 | /* If this event was not handled above, and is not a SIGTRAP, we | |
1411 | report it. SIGILL and SIGSEGV are also treated as traps in | |
1412 | case a breakpoint is inserted at the current PC. If this | |
1413 | target does not support breakpoints, we also report the | |
1414 | SIGTRAP without further processing; it's of no concern to | |
1415 | us. */ | |
2b009048 | 1416 | if (!WIFSTOPPED (*wstat) |
d50171e4 PA |
1417 | || !supports_breakpoints () |
1418 | || (WSTOPSIG (*wstat) != SIGTRAP | |
1419 | && WSTOPSIG (*wstat) != SIGILL | |
1420 | && WSTOPSIG (*wstat) != SIGSEGV) | |
1421 | /* Only handle SIGILL or SIGSEGV if we've hit a recognized | |
1422 | breakpoint. */ | |
1423 | || (WSTOPSIG (*wstat) != SIGTRAP | |
1424 | && !(*the_low_target.breakpoint_at) (event_child->stop_pc))) | |
1425 | { | |
1426 | if (debug_threads && WIFSTOPPED (*wstat)) | |
1427 | fprintf (stderr, "Reporting signal %d for LWP %ld.\n", | |
1428 | WSTOPSIG (*wstat), lwpid_of (event_child)); | |
611cb4a5 | 1429 | |
d50171e4 PA |
1430 | /* If we were stepping over a breakpoint, this signal |
1431 | arriving means we didn't manage to move past the | |
1432 | breakpoint location. Cancel the operation for now --- it | |
1433 | will be handled again on the next resume, if required | |
1434 | (the breakpoint may be removed meanwhile, for | |
1435 | example). */ | |
1436 | if (finish_step_over (event_child)) | |
1437 | { | |
1438 | event_child->need_step_over = 1; | |
1439 | unstop_all_lwps (event_child); | |
1440 | } | |
1441 | return lwpid_of (event_child); | |
1442 | } | |
0d62e5e8 | 1443 | |
d50171e4 | 1444 | stop_pc = event_child->stop_pc; |
0d62e5e8 | 1445 | |
d50171e4 PA |
1446 | /* Handle anything that requires bookkeeping before deciding to |
1447 | report the event or continue waiting. */ | |
1448 | ||
1449 | /* First check if we can explain the SIGTRAP with an internal | |
1450 | breakpoint, or if we should possibly report the event to GDB. | |
1451 | Do this before anything that may remove or insert a | |
2b009048 | 1452 | breakpoint. */ |
d50171e4 PA |
1453 | bp_explains_trap = breakpoint_inserted_here (stop_pc); |
1454 | ||
1455 | /* We have a SIGTRAP, possibly a step-over dance has just | |
1456 | finished. If so, tweak the state machine accordingly, | |
1457 | reinsert breakpoints and delete any reinsert (software | |
1458 | single-step) breakpoints. */ | |
1459 | step_over_finished = finish_step_over (event_child); | |
1460 | ||
1461 | /* Now invoke the callbacks of any breakpoints there. */ | |
1462 | if (!cancel_sigtrap) | |
1463 | check_breakpoints (stop_pc); | |
1464 | ||
1465 | /* If we're stopping threads, resume once more to collect the | |
1466 | SIGSTOP, and do nothing else. Note that we don't set | |
1467 | need_step_over. If this predicate matches, then we've | |
1468 | cancelled the SIGTRAP before reaching here, and we do want | |
1469 | any breakpoint at STOP_PC to be re-hit on resume. */ | |
1470 | if (stopping_threads | |
1471 | || event_child->last_resume_kind == resume_stop) | |
0d62e5e8 | 1472 | { |
d50171e4 PA |
1473 | gdb_assert (cancel_sigtrap); |
1474 | ||
1475 | if (step_over_finished) | |
1476 | unstop_all_lwps (event_child); | |
1477 | ||
0d62e5e8 | 1478 | if (debug_threads) |
d50171e4 PA |
1479 | { |
1480 | if (event_child->last_resume_kind == resume_stop) | |
1481 | fprintf (stderr, "Bailing out; GDB wanted the LWP to stop.\n"); | |
1482 | else if (stopping_threads) | |
1483 | fprintf (stderr, "Bailing out; stopping threads.\n"); | |
1484 | ||
1485 | if (bp_explains_trap) | |
1486 | fprintf (stderr, " Hit a breakpoint.\n"); | |
1487 | if (step_over_finished) | |
1488 | fprintf (stderr, " Step-over finished.\n"); | |
1489 | if (event_child->stopped_by_watchpoint) | |
1490 | fprintf (stderr, " Stopped by watchpoint.\n"); | |
1491 | } | |
1492 | ||
1493 | /* Leave these pending. */ | |
1494 | if (event_child->stopped_by_watchpoint) | |
1495 | return lwpid_of (event_child); | |
1496 | ||
1497 | /* Otherwise, there may or not be a pending SIGSTOP. If | |
1498 | there isn't one, queue one up. In any case, go back to | |
1499 | the event loop to collect it. Don't return yet, as we | |
1500 | don't want this SIGTRAP to be left pending. Note that | |
1501 | since we cancelled the breakpoint above, the PC is | |
1502 | already adjusted, and hence get_stop_pc returns the | |
1503 | correct PC when we collect the SIGSTOP. */ | |
1504 | ||
1505 | if (!event_child->stop_expected) | |
1506 | { | |
1507 | event_child->stop_expected = 1; | |
1508 | kill_lwp (lwpid_of (event_child), SIGSTOP); | |
1509 | } | |
0d62e5e8 DJ |
1510 | |
1511 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
2acc282a | 1512 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
0d62e5e8 DJ |
1513 | continue; |
1514 | } | |
1515 | ||
d50171e4 PA |
1516 | /* We have all the data we need. Either report the event to |
1517 | GDB, or resume threads and keep waiting for more. */ | |
0d62e5e8 | 1518 | |
d50171e4 PA |
1519 | /* Check If GDB would be interested in this event. If GDB |
1520 | wanted this thread to single step, we always want to report | |
1521 | the SIGTRAP, and let GDB handle it. */ | |
1522 | if ((event_child->last_resume_kind == resume_step) | |
1523 | || event_child->stopped_by_watchpoint) | |
0d62e5e8 | 1524 | { |
d50171e4 PA |
1525 | if (step_over_finished) |
1526 | unstop_all_lwps (event_child); | |
bd99dc85 | 1527 | |
d50171e4 | 1528 | if (debug_threads) |
0d62e5e8 | 1529 | { |
d50171e4 PA |
1530 | if (event_child->last_resume_kind == resume_step) |
1531 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); | |
1532 | if (event_child->stopped_by_watchpoint) | |
1533 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
0d62e5e8 | 1534 | } |
d50171e4 PA |
1535 | } |
1536 | /* We found no reason GDB would want us to stop. We either hit | |
1537 | one of our own breakpoints, or finished an internal step GDB | |
1538 | shouldn't know about. */ | |
1539 | else if (step_over_finished || bp_explains_trap) | |
1540 | { | |
1541 | if (debug_threads) | |
0d62e5e8 | 1542 | { |
d50171e4 PA |
1543 | if (bp_explains_trap) |
1544 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1545 | if (step_over_finished) | |
1546 | fprintf (stderr, "Step-over finished.\n"); | |
611cb4a5 | 1547 | } |
0d62e5e8 | 1548 | |
d50171e4 PA |
1549 | /* If we stepped or ran into an internal breakpoint, we've |
1550 | already handled it. So next time we resume (from this | |
1551 | PC), we should step over it. */ | |
1552 | if (breakpoint_here (stop_pc)) | |
1553 | event_child->need_step_over = 1; | |
0d62e5e8 | 1554 | |
d50171e4 PA |
1555 | /* We're not reporting this breakpoint to GDB, so apply the |
1556 | decr_pc_after_break adjustment to the inferior's regcache | |
1557 | ourselves. */ | |
1558 | ||
1559 | if (the_low_target.set_pc != NULL) | |
1560 | { | |
1561 | struct regcache *regcache | |
1562 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
1563 | (*the_low_target.set_pc) (regcache, stop_pc); | |
1564 | } | |
1565 | ||
1566 | /* We've finished stepping over a breakpoint. We've stopped | |
1567 | all LWPs momentarily except the stepping one. This is | |
1568 | where we resume them all again. We're going to keep | |
1569 | waiting, so use proceed, which handles stepping over the | |
1570 | next breakpoint. */ | |
1571 | if (debug_threads) | |
1572 | fprintf (stderr, "proceeding all threads.\n"); | |
1573 | proceed_all_lwps (); | |
1574 | ||
1575 | /* If we stopped threads momentarily, we may have threads | |
1576 | with pending statuses now (except when we're going to | |
1577 | force the next event out of a specific LWP, in which case | |
1578 | don't want to handle the pending events of other LWPs | |
1579 | yet. */ | |
1580 | if (ptid_equal (step_over_bkpt, null_ptid)) | |
1581 | goto again; | |
1582 | else | |
1583 | continue; | |
1584 | } | |
1585 | else | |
0d62e5e8 | 1586 | { |
d50171e4 PA |
1587 | /* GDB breakpoint or program trap, perhaps. */ |
1588 | if (step_over_finished) | |
1589 | unstop_all_lwps (event_child); | |
611cb4a5 DJ |
1590 | } |
1591 | ||
d50171e4 PA |
1592 | if (debug_threads) |
1593 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
1594 | ||
bd99dc85 | 1595 | return lwpid_of (event_child); |
611cb4a5 | 1596 | } |
0d62e5e8 | 1597 | |
611cb4a5 DJ |
1598 | /* NOTREACHED */ |
1599 | return 0; | |
1600 | } | |
1601 | ||
95954743 PA |
1602 | static int |
1603 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1604 | { | |
1605 | ptid_t wait_ptid; | |
1606 | ||
1607 | if (ptid_is_pid (ptid)) | |
1608 | { | |
1609 | /* A request to wait for a specific tgid. This is not possible | |
1610 | with waitpid, so instead, we wait for any child, and leave | |
1611 | children we're not interested in right now with a pending | |
1612 | status to report later. */ | |
1613 | wait_ptid = minus_one_ptid; | |
1614 | } | |
1615 | else | |
1616 | wait_ptid = ptid; | |
1617 | ||
1618 | while (1) | |
1619 | { | |
1620 | int event_pid; | |
1621 | ||
1622 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1623 | ||
1624 | if (event_pid > 0 | |
1625 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1626 | { | |
1627 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1628 | ||
1629 | if (! WIFSTOPPED (*wstat)) | |
1630 | mark_lwp_dead (event_child, *wstat); | |
1631 | else | |
1632 | { | |
1633 | event_child->status_pending_p = 1; | |
1634 | event_child->status_pending = *wstat; | |
1635 | } | |
1636 | } | |
1637 | else | |
1638 | return event_pid; | |
1639 | } | |
1640 | } | |
1641 | ||
d50171e4 PA |
1642 | /* Set this inferior LWP's state as "want-stopped". We won't resume |
1643 | this LWP until the client gives us another action for it. */ | |
1644 | ||
1645 | static void | |
1646 | gdb_wants_lwp_stopped (struct inferior_list_entry *entry) | |
1647 | { | |
1648 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1649 | struct thread_info *thread = get_lwp_thread (lwp); | |
1650 | ||
1651 | /* Most threads are stopped implicitly (all-stop); tag that with | |
1652 | signal 0. The thread being explicitly reported stopped to the | |
1653 | client, gets it's status fixed up afterwards. */ | |
1654 | thread->last_status.kind = TARGET_WAITKIND_STOPPED; | |
1655 | thread->last_status.value.sig = TARGET_SIGNAL_0; | |
1656 | ||
1657 | lwp->last_resume_kind = resume_stop; | |
1658 | } | |
1659 | ||
1660 | /* Set all LWP's states as "want-stopped". */ | |
1661 | ||
1662 | static void | |
1663 | gdb_wants_all_stopped (void) | |
1664 | { | |
1665 | for_each_inferior (&all_lwps, gdb_wants_lwp_stopped); | |
1666 | } | |
1667 | ||
0d62e5e8 | 1668 | /* Wait for process, returns status. */ |
da6d8c04 | 1669 | |
95954743 PA |
1670 | static ptid_t |
1671 | linux_wait_1 (ptid_t ptid, | |
1672 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1673 | { |
e5f1222d | 1674 | int w; |
bd99dc85 PA |
1675 | struct thread_info *thread = NULL; |
1676 | struct lwp_info *lwp = NULL; | |
1677 | int options; | |
bd99dc85 PA |
1678 | int pid; |
1679 | ||
1680 | /* Translate generic target options into linux options. */ | |
1681 | options = __WALL; | |
1682 | if (target_options & TARGET_WNOHANG) | |
1683 | options |= WNOHANG; | |
0d62e5e8 DJ |
1684 | |
1685 | retry: | |
bd99dc85 PA |
1686 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1687 | ||
0d62e5e8 DJ |
1688 | /* If we were only supposed to resume one thread, only wait for |
1689 | that thread - if it's still alive. If it died, however - which | |
1690 | can happen if we're coming from the thread death case below - | |
1691 | then we need to make sure we restart the other threads. We could | |
1692 | pick a thread at random or restart all; restarting all is less | |
1693 | arbitrary. */ | |
95954743 PA |
1694 | if (!non_stop |
1695 | && !ptid_equal (cont_thread, null_ptid) | |
1696 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1697 | { |
bd99dc85 PA |
1698 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1699 | cont_thread); | |
0d62e5e8 DJ |
1700 | |
1701 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1702 | if (thread == NULL) |
64386c31 DJ |
1703 | { |
1704 | struct thread_resume resume_info; | |
95954743 | 1705 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1706 | resume_info.kind = resume_continue; |
1707 | resume_info.sig = 0; | |
2bd7c093 | 1708 | linux_resume (&resume_info, 1); |
64386c31 | 1709 | } |
bd99dc85 | 1710 | else |
95954743 | 1711 | ptid = cont_thread; |
0d62e5e8 | 1712 | } |
da6d8c04 | 1713 | |
95954743 | 1714 | pid = linux_wait_for_event (ptid, &w, options); |
bd99dc85 | 1715 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1716 | return null_ptid; |
bd99dc85 PA |
1717 | |
1718 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1719 | |
0d62e5e8 DJ |
1720 | /* If we are waiting for a particular child, and it exited, |
1721 | linux_wait_for_event will return its exit status. Similarly if | |
1722 | the last child exited. If this is not the last child, however, | |
1723 | do not report it as exited until there is a 'thread exited' response | |
1724 | available in the remote protocol. Instead, just wait for another event. | |
1725 | This should be safe, because if the thread crashed we will already | |
1726 | have reported the termination signal to GDB; that should stop any | |
1727 | in-progress stepping operations, etc. | |
1728 | ||
1729 | Report the exit status of the last thread to exit. This matches | |
1730 | LinuxThreads' behavior. */ | |
1731 | ||
95954743 | 1732 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1733 | { |
bd99dc85 | 1734 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1735 | { |
95954743 PA |
1736 | int pid = pid_of (lwp); |
1737 | struct process_info *process = find_process_pid (pid); | |
5b1c542e | 1738 | |
ca5c370d PA |
1739 | #ifdef USE_THREAD_DB |
1740 | thread_db_free (process, 0); | |
1741 | #endif | |
bd99dc85 | 1742 | delete_lwp (lwp); |
ca5c370d | 1743 | linux_remove_process (process); |
5b1c542e | 1744 | |
bd99dc85 | 1745 | current_inferior = NULL; |
5b1c542e | 1746 | |
bd99dc85 PA |
1747 | if (WIFEXITED (w)) |
1748 | { | |
1749 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1750 | ourstatus->value.integer = WEXITSTATUS (w); | |
1751 | ||
1752 | if (debug_threads) | |
1753 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1754 | } | |
1755 | else | |
1756 | { | |
1757 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1758 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1759 | ||
1760 | if (debug_threads) | |
1761 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1762 | ||
1763 | } | |
5b1c542e | 1764 | |
95954743 | 1765 | return pid_to_ptid (pid); |
0d62e5e8 | 1766 | } |
da6d8c04 | 1767 | } |
0d62e5e8 | 1768 | else |
da6d8c04 | 1769 | { |
0d62e5e8 DJ |
1770 | if (!WIFSTOPPED (w)) |
1771 | goto retry; | |
da6d8c04 DJ |
1772 | } |
1773 | ||
5b1c542e | 1774 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1775 | |
d50171e4 PA |
1776 | /* Do this before the gdb_wants_all_stopped calls below, since they |
1777 | always set last_resume_kind to resume_stop. */ | |
1778 | if (lwp->last_resume_kind == resume_stop && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
1779 | { |
1780 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1781 | and it stopped cleanly, so report as SIG0. The use of | |
1782 | SIGSTOP is an implementation detail. */ | |
1783 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1784 | } | |
d50171e4 | 1785 | else if (lwp->last_resume_kind == resume_stop && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
1786 | { |
1787 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 1788 | but, it stopped for other reasons. */ |
bd99dc85 PA |
1789 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
1790 | } | |
1791 | else | |
1792 | { | |
1793 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1794 | } | |
1795 | ||
d50171e4 PA |
1796 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
1797 | ||
1798 | if (!non_stop) | |
1799 | { | |
1800 | /* In all-stop, stop all threads, we're about to report an event | |
1801 | to GDB. */ | |
1802 | stop_all_lwps (); | |
1803 | ||
1804 | /* Do not leave a pending single-step finish to be reported to | |
1805 | the client. The client will give us a new action for this | |
1806 | thread, possibly a continue request --- otherwise, the client | |
1807 | would consider this pending SIGTRAP reported later a spurious | |
1808 | signal. */ | |
1809 | cancel_finished_single_steps (lwp); | |
1810 | ||
1811 | /* From GDB's perspective, all-stop mode always stops all | |
1812 | threads implicitly. Tag all threads as "want-stopped". */ | |
1813 | gdb_wants_all_stopped (); | |
1814 | } | |
1815 | else | |
1816 | { | |
1817 | /* We're reporting this LWP as stopped. Update it's | |
1818 | "want-stopped" state to what the client wants, until it gets | |
1819 | a new resume action. */ | |
1820 | gdb_wants_lwp_stopped (&lwp->head); | |
1821 | } | |
1822 | ||
bd99dc85 | 1823 | if (debug_threads) |
95954743 PA |
1824 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
1825 | target_pid_to_str (lwp->head.id), | |
bd99dc85 PA |
1826 | ourstatus->kind, |
1827 | ourstatus->value.sig); | |
1828 | ||
d50171e4 | 1829 | get_lwp_thread (lwp)->last_status = *ourstatus; |
95954743 | 1830 | return lwp->head.id; |
bd99dc85 PA |
1831 | } |
1832 | ||
1833 | /* Get rid of any pending event in the pipe. */ | |
1834 | static void | |
1835 | async_file_flush (void) | |
1836 | { | |
1837 | int ret; | |
1838 | char buf; | |
1839 | ||
1840 | do | |
1841 | ret = read (linux_event_pipe[0], &buf, 1); | |
1842 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1843 | } | |
1844 | ||
1845 | /* Put something in the pipe, so the event loop wakes up. */ | |
1846 | static void | |
1847 | async_file_mark (void) | |
1848 | { | |
1849 | int ret; | |
1850 | ||
1851 | async_file_flush (); | |
1852 | ||
1853 | do | |
1854 | ret = write (linux_event_pipe[1], "+", 1); | |
1855 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1856 | ||
1857 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1858 | be awakened anyway. */ | |
1859 | } | |
1860 | ||
95954743 PA |
1861 | static ptid_t |
1862 | linux_wait (ptid_t ptid, | |
1863 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1864 | { |
95954743 | 1865 | ptid_t event_ptid; |
bd99dc85 PA |
1866 | |
1867 | if (debug_threads) | |
95954743 | 1868 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1869 | |
1870 | /* Flush the async file first. */ | |
1871 | if (target_is_async_p ()) | |
1872 | async_file_flush (); | |
1873 | ||
95954743 | 1874 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1875 | |
1876 | /* If at least one stop was reported, there may be more. A single | |
1877 | SIGCHLD can signal more than one child stop. */ | |
1878 | if (target_is_async_p () | |
1879 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1880 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1881 | async_file_mark (); |
1882 | ||
1883 | return event_ptid; | |
da6d8c04 DJ |
1884 | } |
1885 | ||
c5f62d5f | 1886 | /* Send a signal to an LWP. */ |
fd500816 DJ |
1887 | |
1888 | static int | |
a1928bad | 1889 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 1890 | { |
c5f62d5f DE |
1891 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1892 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 1893 | |
c5f62d5f DE |
1894 | #ifdef __NR_tkill |
1895 | { | |
1896 | static int tkill_failed; | |
fd500816 | 1897 | |
c5f62d5f DE |
1898 | if (!tkill_failed) |
1899 | { | |
1900 | int ret; | |
1901 | ||
1902 | errno = 0; | |
1903 | ret = syscall (__NR_tkill, lwpid, signo); | |
1904 | if (errno != ENOSYS) | |
1905 | return ret; | |
1906 | tkill_failed = 1; | |
1907 | } | |
1908 | } | |
fd500816 DJ |
1909 | #endif |
1910 | ||
1911 | return kill (lwpid, signo); | |
1912 | } | |
1913 | ||
0d62e5e8 DJ |
1914 | static void |
1915 | send_sigstop (struct inferior_list_entry *entry) | |
1916 | { | |
54a0b537 | 1917 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1918 | int pid; |
0d62e5e8 | 1919 | |
54a0b537 | 1920 | if (lwp->stopped) |
0d62e5e8 DJ |
1921 | return; |
1922 | ||
bd99dc85 PA |
1923 | pid = lwpid_of (lwp); |
1924 | ||
0d62e5e8 DJ |
1925 | /* If we already have a pending stop signal for this process, don't |
1926 | send another. */ | |
54a0b537 | 1927 | if (lwp->stop_expected) |
0d62e5e8 | 1928 | { |
ae13219e | 1929 | if (debug_threads) |
bd99dc85 | 1930 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 1931 | |
0d62e5e8 DJ |
1932 | return; |
1933 | } | |
1934 | ||
1935 | if (debug_threads) | |
bd99dc85 | 1936 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1937 | |
d50171e4 | 1938 | lwp->stop_expected = 1; |
bd99dc85 | 1939 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1940 | } |
1941 | ||
95954743 PA |
1942 | static void |
1943 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
1944 | { | |
1945 | /* It's dead, really. */ | |
1946 | lwp->dead = 1; | |
1947 | ||
1948 | /* Store the exit status for later. */ | |
1949 | lwp->status_pending_p = 1; | |
1950 | lwp->status_pending = wstat; | |
1951 | ||
95954743 PA |
1952 | /* Prevent trying to stop it. */ |
1953 | lwp->stopped = 1; | |
1954 | ||
1955 | /* No further stops are expected from a dead lwp. */ | |
1956 | lwp->stop_expected = 0; | |
1957 | } | |
1958 | ||
d50171e4 PA |
1959 | static int |
1960 | cancel_finished_single_step (struct inferior_list_entry *entry, void *except) | |
1961 | { | |
1962 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1963 | struct thread_info *saved_inferior; | |
1964 | ||
1965 | if (lwp == except) | |
1966 | return 0; | |
1967 | ||
1968 | saved_inferior = current_inferior; | |
1969 | current_inferior = get_lwp_thread (lwp); | |
1970 | ||
1971 | /* Do not leave a pending single-step finish to be reported to the | |
1972 | client. The client will give us a new action for this thread, | |
1973 | possibly a continue request --- otherwise, the client would | |
1974 | consider this pending SIGTRAP reported later a spurious | |
1975 | signal. */ | |
1976 | if (lwp->status_pending_p | |
1977 | && WSTOPSIG (lwp->status_pending) == SIGTRAP | |
1978 | && lwp->stepping | |
1979 | && !lwp->stopped_by_watchpoint) | |
1980 | { | |
1981 | if (debug_threads) | |
1982 | fprintf (stderr, " single-step SIGTRAP cancelled\n"); | |
1983 | ||
1984 | lwp->status_pending_p = 0; | |
1985 | lwp->status_pending = 0; | |
1986 | } | |
1987 | ||
1988 | current_inferior = saved_inferior; | |
1989 | return 0; | |
1990 | } | |
1991 | ||
1992 | static void | |
1993 | cancel_finished_single_steps (struct lwp_info *except) | |
1994 | { | |
1995 | find_inferior (&all_lwps, cancel_finished_single_step, except); | |
1996 | } | |
1997 | ||
0d62e5e8 DJ |
1998 | static void |
1999 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2000 | { | |
54a0b537 | 2001 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2002 | struct thread_info *saved_inferior; |
a1928bad | 2003 | int wstat; |
95954743 PA |
2004 | ptid_t saved_tid; |
2005 | ptid_t ptid; | |
d50171e4 | 2006 | int pid; |
0d62e5e8 | 2007 | |
54a0b537 | 2008 | if (lwp->stopped) |
d50171e4 PA |
2009 | { |
2010 | if (debug_threads) | |
2011 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2012 | lwpid_of (lwp)); | |
2013 | return; | |
2014 | } | |
0d62e5e8 DJ |
2015 | |
2016 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2017 | if (saved_inferior != NULL) |
2018 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2019 | else | |
95954743 | 2020 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2021 | |
95954743 | 2022 | ptid = lwp->head.id; |
bd99dc85 | 2023 | |
d50171e4 PA |
2024 | if (debug_threads) |
2025 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2026 | ||
2027 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2028 | |
2029 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2030 | and record the pending SIGSTOP. If the process exited, just | |
2031 | return. */ | |
d50171e4 | 2032 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2033 | { |
2034 | if (debug_threads) | |
d50171e4 PA |
2035 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2036 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2037 | |
d50171e4 | 2038 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2039 | { |
2040 | if (debug_threads) | |
d50171e4 PA |
2041 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2042 | lwpid_of (lwp), wstat); | |
2043 | ||
c35fafde PA |
2044 | lwp->status_pending_p = 1; |
2045 | lwp->status_pending = wstat; | |
2046 | } | |
0d62e5e8 | 2047 | } |
d50171e4 | 2048 | else |
95954743 PA |
2049 | { |
2050 | if (debug_threads) | |
d50171e4 | 2051 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2052 | |
d50171e4 PA |
2053 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2054 | if (lwp) | |
2055 | { | |
2056 | /* Leave this status pending for the next time we're able to | |
2057 | report it. In the mean time, we'll report this lwp as | |
2058 | dead to GDB, so GDB doesn't try to read registers and | |
2059 | memory from it. This can only happen if this was the | |
2060 | last thread of the process; otherwise, PID is removed | |
2061 | from the thread tables before linux_wait_for_event | |
2062 | returns. */ | |
2063 | mark_lwp_dead (lwp, wstat); | |
2064 | } | |
95954743 | 2065 | } |
0d62e5e8 | 2066 | |
bd99dc85 | 2067 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2068 | current_inferior = saved_inferior; |
2069 | else | |
2070 | { | |
2071 | if (debug_threads) | |
2072 | fprintf (stderr, "Previously current thread died.\n"); | |
2073 | ||
bd99dc85 PA |
2074 | if (non_stop) |
2075 | { | |
2076 | /* We can't change the current inferior behind GDB's back, | |
2077 | otherwise, a subsequent command may apply to the wrong | |
2078 | process. */ | |
2079 | current_inferior = NULL; | |
2080 | } | |
2081 | else | |
2082 | { | |
2083 | /* Set a valid thread as current. */ | |
2084 | set_desired_inferior (0); | |
2085 | } | |
0d62e5e8 DJ |
2086 | } |
2087 | } | |
2088 | ||
2089 | static void | |
54a0b537 | 2090 | stop_all_lwps (void) |
0d62e5e8 DJ |
2091 | { |
2092 | stopping_threads = 1; | |
54a0b537 PA |
2093 | for_each_inferior (&all_lwps, send_sigstop); |
2094 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
2095 | stopping_threads = 0; |
2096 | } | |
2097 | ||
da6d8c04 DJ |
2098 | /* Resume execution of the inferior process. |
2099 | If STEP is nonzero, single-step it. | |
2100 | If SIGNAL is nonzero, give it that signal. */ | |
2101 | ||
ce3a066d | 2102 | static void |
2acc282a | 2103 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 2104 | int step, int signal, siginfo_t *info) |
da6d8c04 | 2105 | { |
0d62e5e8 DJ |
2106 | struct thread_info *saved_inferior; |
2107 | ||
54a0b537 | 2108 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
2109 | return; |
2110 | ||
2111 | /* If we have pending signals or status, and a new signal, enqueue the | |
2112 | signal. Also enqueue the signal if we are waiting to reinsert a | |
2113 | breakpoint; it will be picked up again below. */ | |
2114 | if (signal != 0 | |
54a0b537 PA |
2115 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
2116 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
2117 | { |
2118 | struct pending_signals *p_sig; | |
bca929d3 | 2119 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 2120 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 2121 | p_sig->signal = signal; |
32ca6d61 DJ |
2122 | if (info == NULL) |
2123 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2124 | else | |
2125 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 2126 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
2127 | } |
2128 | ||
d50171e4 PA |
2129 | if (lwp->status_pending_p) |
2130 | { | |
2131 | if (debug_threads) | |
2132 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
2133 | " has pending status\n", | |
2134 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
2135 | lwp->stop_expected ? "expected" : "not expected"); | |
2136 | return; | |
2137 | } | |
0d62e5e8 DJ |
2138 | |
2139 | saved_inferior = current_inferior; | |
54a0b537 | 2140 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
2141 | |
2142 | if (debug_threads) | |
1b3f6016 | 2143 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 2144 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 2145 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
2146 | |
2147 | /* This bit needs some thinking about. If we get a signal that | |
2148 | we must report while a single-step reinsert is still pending, | |
2149 | we often end up resuming the thread. It might be better to | |
2150 | (ew) allow a stack of pending events; then we could be sure that | |
2151 | the reinsert happened right away and not lose any signals. | |
2152 | ||
2153 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 2154 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
2155 | complete correctness, so it won't solve that problem. It may be |
2156 | worthwhile just to solve this one, however. */ | |
54a0b537 | 2157 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
2158 | { |
2159 | if (debug_threads) | |
d50171e4 PA |
2160 | fprintf (stderr, " pending reinsert at 0x%s\n", |
2161 | paddress (lwp->bp_reinsert)); | |
2162 | ||
2163 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
2164 | { | |
2165 | if (step == 0) | |
2166 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
2167 | ||
2168 | step = 1; | |
2169 | } | |
0d62e5e8 DJ |
2170 | |
2171 | /* Postpone any pending signal. It was enqueued above. */ | |
2172 | signal = 0; | |
2173 | } | |
2174 | ||
aa691b87 | 2175 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 2176 | { |
442ea881 PA |
2177 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
2178 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 2179 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
2180 | } |
2181 | ||
2182 | /* If we have pending signals, consume one unless we are trying to reinsert | |
2183 | a breakpoint. */ | |
54a0b537 | 2184 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
2185 | { |
2186 | struct pending_signals **p_sig; | |
2187 | ||
54a0b537 | 2188 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
2189 | while ((*p_sig)->prev != NULL) |
2190 | p_sig = &(*p_sig)->prev; | |
2191 | ||
2192 | signal = (*p_sig)->signal; | |
32ca6d61 | 2193 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 2194 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 2195 | |
0d62e5e8 DJ |
2196 | free (*p_sig); |
2197 | *p_sig = NULL; | |
2198 | } | |
2199 | ||
aa5ca48f DE |
2200 | if (the_low_target.prepare_to_resume != NULL) |
2201 | the_low_target.prepare_to_resume (lwp); | |
2202 | ||
0d62e5e8 | 2203 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 2204 | get_lwp_thread (lwp)); |
da6d8c04 | 2205 | errno = 0; |
54a0b537 | 2206 | lwp->stopped = 0; |
c3adc08c | 2207 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 2208 | lwp->stepping = step; |
14ce3065 DE |
2209 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
2210 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2211 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2212 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
2213 | |
2214 | current_inferior = saved_inferior; | |
da6d8c04 | 2215 | if (errno) |
3221518c UW |
2216 | { |
2217 | /* ESRCH from ptrace either means that the thread was already | |
2218 | running (an error) or that it is gone (a race condition). If | |
2219 | it's gone, we will get a notification the next time we wait, | |
2220 | so we can ignore the error. We could differentiate these | |
2221 | two, but it's tricky without waiting; the thread still exists | |
2222 | as a zombie, so sending it signal 0 would succeed. So just | |
2223 | ignore ESRCH. */ | |
2224 | if (errno == ESRCH) | |
2225 | return; | |
2226 | ||
2227 | perror_with_name ("ptrace"); | |
2228 | } | |
da6d8c04 DJ |
2229 | } |
2230 | ||
2bd7c093 PA |
2231 | struct thread_resume_array |
2232 | { | |
2233 | struct thread_resume *resume; | |
2234 | size_t n; | |
2235 | }; | |
64386c31 DJ |
2236 | |
2237 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
2238 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
2239 | resume request. | |
2240 | ||
2241 | This algorithm is O(threads * resume elements), but resume elements | |
2242 | is small (and will remain small at least until GDB supports thread | |
2243 | suspension). */ | |
2bd7c093 PA |
2244 | static int |
2245 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 2246 | { |
54a0b537 | 2247 | struct lwp_info *lwp; |
64386c31 | 2248 | struct thread_info *thread; |
5544ad89 | 2249 | int ndx; |
2bd7c093 | 2250 | struct thread_resume_array *r; |
64386c31 DJ |
2251 | |
2252 | thread = (struct thread_info *) entry; | |
54a0b537 | 2253 | lwp = get_thread_lwp (thread); |
2bd7c093 | 2254 | r = arg; |
64386c31 | 2255 | |
2bd7c093 | 2256 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
2257 | { |
2258 | ptid_t ptid = r->resume[ndx].thread; | |
2259 | if (ptid_equal (ptid, minus_one_ptid) | |
2260 | || ptid_equal (ptid, entry->id) | |
2261 | || (ptid_is_pid (ptid) | |
2262 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
2263 | || (ptid_get_lwp (ptid) == -1 | |
2264 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
2265 | { | |
d50171e4 PA |
2266 | if (r->resume[ndx].kind == resume_stop |
2267 | && lwp->last_resume_kind == resume_stop) | |
2268 | { | |
2269 | if (debug_threads) | |
2270 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
2271 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
2272 | ? "stopped" | |
2273 | : "stopping", | |
2274 | lwpid_of (lwp)); | |
2275 | ||
2276 | continue; | |
2277 | } | |
2278 | ||
95954743 | 2279 | lwp->resume = &r->resume[ndx]; |
d50171e4 | 2280 | lwp->last_resume_kind = lwp->resume->kind; |
95954743 PA |
2281 | return 0; |
2282 | } | |
2283 | } | |
2bd7c093 PA |
2284 | |
2285 | /* No resume action for this thread. */ | |
2286 | lwp->resume = NULL; | |
64386c31 | 2287 | |
2bd7c093 | 2288 | return 0; |
5544ad89 DJ |
2289 | } |
2290 | ||
5544ad89 | 2291 | |
bd99dc85 PA |
2292 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
2293 | static int | |
2294 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 2295 | { |
bd99dc85 | 2296 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 2297 | |
bd99dc85 PA |
2298 | /* LWPs which will not be resumed are not interesting, because |
2299 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 2300 | if (lwp->resume == NULL) |
bd99dc85 | 2301 | return 0; |
64386c31 | 2302 | |
bd99dc85 | 2303 | if (lwp->status_pending_p) |
d50171e4 PA |
2304 | * (int *) flag_p = 1; |
2305 | ||
2306 | return 0; | |
2307 | } | |
2308 | ||
2309 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
2310 | internal breakpoint that we need to step over. It assumes that any | |
2311 | required STOP_PC adjustment has already been propagated to the | |
2312 | inferior's regcache. */ | |
2313 | ||
2314 | static int | |
2315 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
2316 | { | |
2317 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2318 | struct thread_info *saved_inferior; | |
2319 | CORE_ADDR pc; | |
2320 | ||
2321 | /* LWPs which will not be resumed are not interesting, because we | |
2322 | might not wait for them next time through linux_wait. */ | |
2323 | ||
2324 | if (!lwp->stopped) | |
2325 | { | |
2326 | if (debug_threads) | |
2327 | fprintf (stderr, | |
2328 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
2329 | lwpid_of (lwp)); | |
2330 | return 0; | |
2331 | } | |
2332 | ||
2333 | if (lwp->last_resume_kind == resume_stop) | |
2334 | { | |
2335 | if (debug_threads) | |
2336 | fprintf (stderr, | |
2337 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
2338 | lwpid_of (lwp)); | |
2339 | return 0; | |
2340 | } | |
2341 | ||
2342 | if (!lwp->need_step_over) | |
2343 | { | |
2344 | if (debug_threads) | |
2345 | fprintf (stderr, | |
2346 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
2347 | } | |
5544ad89 | 2348 | |
bd99dc85 | 2349 | if (lwp->status_pending_p) |
d50171e4 PA |
2350 | { |
2351 | if (debug_threads) | |
2352 | fprintf (stderr, | |
2353 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
2354 | lwpid_of (lwp)); | |
2355 | return 0; | |
2356 | } | |
2357 | ||
2358 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
2359 | or we have. */ | |
2360 | pc = get_pc (lwp); | |
2361 | ||
2362 | /* If the PC has changed since we stopped, then don't do anything, | |
2363 | and let the breakpoint/tracepoint be hit. This happens if, for | |
2364 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
2365 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
2366 | command, or poked thread's registers herself. */ | |
2367 | if (pc != lwp->stop_pc) | |
2368 | { | |
2369 | if (debug_threads) | |
2370 | fprintf (stderr, | |
2371 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
2372 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
2373 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
2374 | ||
2375 | lwp->need_step_over = 0; | |
2376 | return 0; | |
2377 | } | |
2378 | ||
2379 | saved_inferior = current_inferior; | |
2380 | current_inferior = get_lwp_thread (lwp); | |
2381 | ||
2382 | /* We only step over our breakpoints. */ | |
2383 | if (breakpoint_here (pc)) | |
2384 | { | |
2385 | if (debug_threads) | |
2386 | fprintf (stderr, | |
2387 | "Need step over [LWP %ld]? yes, found breakpoint at 0x%s\n", | |
2388 | lwpid_of (lwp), paddress (pc)); | |
2389 | ||
2390 | /* We've found an lwp that needs stepping over --- return 1 so | |
2391 | that find_inferior stops looking. */ | |
2392 | current_inferior = saved_inferior; | |
2393 | ||
2394 | /* If the step over is cancelled, this is set again. */ | |
2395 | lwp->need_step_over = 0; | |
2396 | return 1; | |
2397 | } | |
2398 | ||
2399 | current_inferior = saved_inferior; | |
2400 | ||
2401 | if (debug_threads) | |
2402 | fprintf (stderr, | |
2403 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
2404 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 2405 | |
bd99dc85 | 2406 | return 0; |
5544ad89 DJ |
2407 | } |
2408 | ||
d50171e4 PA |
2409 | /* Start a step-over operation on LWP. When LWP stopped at a |
2410 | breakpoint, to make progress, we need to remove the breakpoint out | |
2411 | of the way. If we let other threads run while we do that, they may | |
2412 | pass by the breakpoint location and miss hitting it. To avoid | |
2413 | that, a step-over momentarily stops all threads while LWP is | |
2414 | single-stepped while the breakpoint is temporarily uninserted from | |
2415 | the inferior. When the single-step finishes, we reinsert the | |
2416 | breakpoint, and let all threads that are supposed to be running, | |
2417 | run again. | |
2418 | ||
2419 | On targets that don't support hardware single-step, we don't | |
2420 | currently support full software single-stepping. Instead, we only | |
2421 | support stepping over the thread event breakpoint, by asking the | |
2422 | low target where to place a reinsert breakpoint. Since this | |
2423 | routine assumes the breakpoint being stepped over is a thread event | |
2424 | breakpoint, it usually assumes the return address of the current | |
2425 | function is a good enough place to set the reinsert breakpoint. */ | |
2426 | ||
2427 | static int | |
2428 | start_step_over (struct lwp_info *lwp) | |
2429 | { | |
2430 | struct thread_info *saved_inferior; | |
2431 | CORE_ADDR pc; | |
2432 | int step; | |
2433 | ||
2434 | if (debug_threads) | |
2435 | fprintf (stderr, | |
2436 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
2437 | lwpid_of (lwp)); | |
2438 | ||
2439 | stop_all_lwps (); | |
2440 | ||
2441 | if (debug_threads) | |
2442 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
2443 | ||
2444 | /* Note, we should always reach here with an already adjusted PC, | |
2445 | either by GDB (if we're resuming due to GDB's request), or by our | |
2446 | caller, if we just finished handling an internal breakpoint GDB | |
2447 | shouldn't care about. */ | |
2448 | pc = get_pc (lwp); | |
2449 | ||
2450 | saved_inferior = current_inferior; | |
2451 | current_inferior = get_lwp_thread (lwp); | |
2452 | ||
2453 | lwp->bp_reinsert = pc; | |
2454 | uninsert_breakpoints_at (pc); | |
2455 | ||
2456 | if (can_hardware_single_step ()) | |
2457 | { | |
2458 | step = 1; | |
2459 | } | |
2460 | else | |
2461 | { | |
2462 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
2463 | set_reinsert_breakpoint (raddr); | |
2464 | step = 0; | |
2465 | } | |
2466 | ||
2467 | current_inferior = saved_inferior; | |
2468 | ||
2469 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
2470 | ||
2471 | /* Require next event from this LWP. */ | |
2472 | step_over_bkpt = lwp->head.id; | |
2473 | return 1; | |
2474 | } | |
2475 | ||
2476 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
2477 | start_step_over, if still there, and delete any reinsert | |
2478 | breakpoints we've set, on non hardware single-step targets. */ | |
2479 | ||
2480 | static int | |
2481 | finish_step_over (struct lwp_info *lwp) | |
2482 | { | |
2483 | if (lwp->bp_reinsert != 0) | |
2484 | { | |
2485 | if (debug_threads) | |
2486 | fprintf (stderr, "Finished step over.\n"); | |
2487 | ||
2488 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
2489 | may be no breakpoint to reinsert there by now. */ | |
2490 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
2491 | ||
2492 | lwp->bp_reinsert = 0; | |
2493 | ||
2494 | /* Delete any software-single-step reinsert breakpoints. No | |
2495 | longer needed. We don't have to worry about other threads | |
2496 | hitting this trap, and later not being able to explain it, | |
2497 | because we were stepping over a breakpoint, and we hold all | |
2498 | threads but LWP stopped while doing that. */ | |
2499 | if (!can_hardware_single_step ()) | |
2500 | delete_reinsert_breakpoints (); | |
2501 | ||
2502 | step_over_bkpt = null_ptid; | |
2503 | return 1; | |
2504 | } | |
2505 | else | |
2506 | return 0; | |
2507 | } | |
2508 | ||
5544ad89 DJ |
2509 | /* This function is called once per thread. We check the thread's resume |
2510 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 2511 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 2512 | |
bd99dc85 PA |
2513 | For threads which we aren't explicitly told otherwise, we preserve |
2514 | the stepping flag; this is used for stepping over gdbserver-placed | |
2515 | breakpoints. | |
2516 | ||
2517 | If pending_flags was set in any thread, we queue any needed | |
2518 | signals, since we won't actually resume. We already have a pending | |
2519 | event to report, so we don't need to preserve any step requests; | |
2520 | they should be re-issued if necessary. */ | |
2521 | ||
2522 | static int | |
2523 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 2524 | { |
54a0b537 | 2525 | struct lwp_info *lwp; |
5544ad89 | 2526 | struct thread_info *thread; |
bd99dc85 | 2527 | int step; |
d50171e4 PA |
2528 | int leave_all_stopped = * (int *) arg; |
2529 | int leave_pending; | |
5544ad89 DJ |
2530 | |
2531 | thread = (struct thread_info *) entry; | |
54a0b537 | 2532 | lwp = get_thread_lwp (thread); |
5544ad89 | 2533 | |
2bd7c093 | 2534 | if (lwp->resume == NULL) |
bd99dc85 | 2535 | return 0; |
5544ad89 | 2536 | |
bd99dc85 | 2537 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 2538 | { |
bd99dc85 | 2539 | if (debug_threads) |
d50171e4 | 2540 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
2541 | |
2542 | if (!lwp->stopped) | |
2543 | { | |
2544 | if (debug_threads) | |
d50171e4 | 2545 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 2546 | |
d50171e4 PA |
2547 | /* Stop the thread, and wait for the event asynchronously, |
2548 | through the event loop. */ | |
bd99dc85 PA |
2549 | send_sigstop (&lwp->head); |
2550 | } | |
2551 | else | |
2552 | { | |
2553 | if (debug_threads) | |
d50171e4 PA |
2554 | fprintf (stderr, "already stopped LWP %ld\n", |
2555 | lwpid_of (lwp)); | |
2556 | ||
2557 | /* The LWP may have been stopped in an internal event that | |
2558 | was not meant to be notified back to GDB (e.g., gdbserver | |
2559 | breakpoint), so we should be reporting a stop event in | |
2560 | this case too. */ | |
2561 | ||
2562 | /* If the thread already has a pending SIGSTOP, this is a | |
2563 | no-op. Otherwise, something later will presumably resume | |
2564 | the thread and this will cause it to cancel any pending | |
2565 | operation, due to last_resume_kind == resume_stop. If | |
2566 | the thread already has a pending status to report, we | |
2567 | will still report it the next time we wait - see | |
2568 | status_pending_p_callback. */ | |
2569 | send_sigstop (&lwp->head); | |
bd99dc85 | 2570 | } |
32ca6d61 | 2571 | |
bd99dc85 PA |
2572 | /* For stop requests, we're done. */ |
2573 | lwp->resume = NULL; | |
d50171e4 | 2574 | get_lwp_thread (lwp)->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 2575 | return 0; |
5544ad89 DJ |
2576 | } |
2577 | ||
bd99dc85 PA |
2578 | /* If this thread which is about to be resumed has a pending status, |
2579 | then don't resume any threads - we can just report the pending | |
2580 | status. Make sure to queue any signals that would otherwise be | |
2581 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
2582 | thread has a pending status. If there's a thread that needs the |
2583 | step-over-breakpoint dance, then don't resume any other thread | |
2584 | but that particular one. */ | |
2585 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 2586 | |
d50171e4 | 2587 | if (!leave_pending) |
bd99dc85 PA |
2588 | { |
2589 | if (debug_threads) | |
2590 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 2591 | |
d50171e4 | 2592 | step = (lwp->resume->kind == resume_step); |
2acc282a | 2593 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
d50171e4 | 2594 | get_lwp_thread (lwp)->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 PA |
2595 | } |
2596 | else | |
2597 | { | |
2598 | if (debug_threads) | |
2599 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 2600 | |
bd99dc85 PA |
2601 | /* If we have a new signal, enqueue the signal. */ |
2602 | if (lwp->resume->sig != 0) | |
2603 | { | |
2604 | struct pending_signals *p_sig; | |
2605 | p_sig = xmalloc (sizeof (*p_sig)); | |
2606 | p_sig->prev = lwp->pending_signals; | |
2607 | p_sig->signal = lwp->resume->sig; | |
2608 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2609 | ||
2610 | /* If this is the same signal we were previously stopped by, | |
2611 | make sure to queue its siginfo. We can ignore the return | |
2612 | value of ptrace; if it fails, we'll skip | |
2613 | PTRACE_SETSIGINFO. */ | |
2614 | if (WIFSTOPPED (lwp->last_status) | |
2615 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
2616 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
2617 | ||
2618 | lwp->pending_signals = p_sig; | |
2619 | } | |
2620 | } | |
5544ad89 | 2621 | |
bd99dc85 | 2622 | lwp->resume = NULL; |
5544ad89 | 2623 | return 0; |
0d62e5e8 DJ |
2624 | } |
2625 | ||
2626 | static void | |
2bd7c093 | 2627 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 2628 | { |
2bd7c093 | 2629 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
2630 | struct lwp_info *need_step_over = NULL; |
2631 | int any_pending; | |
2632 | int leave_all_stopped; | |
c6ecbae5 | 2633 | |
2bd7c093 | 2634 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 2635 | |
d50171e4 PA |
2636 | /* If there is a thread which would otherwise be resumed, which has |
2637 | a pending status, then don't resume any threads - we can just | |
2638 | report the pending status. Make sure to queue any signals that | |
2639 | would otherwise be sent. In non-stop mode, we'll apply this | |
2640 | logic to each thread individually. We consume all pending events | |
2641 | before considering to start a step-over (in all-stop). */ | |
2642 | any_pending = 0; | |
bd99dc85 | 2643 | if (!non_stop) |
d50171e4 PA |
2644 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
2645 | ||
2646 | /* If there is a thread which would otherwise be resumed, which is | |
2647 | stopped at a breakpoint that needs stepping over, then don't | |
2648 | resume any threads - have it step over the breakpoint with all | |
2649 | other threads stopped, then resume all threads again. Make sure | |
2650 | to queue any signals that would otherwise be delivered or | |
2651 | queued. */ | |
2652 | if (!any_pending && supports_breakpoints ()) | |
2653 | need_step_over | |
2654 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2655 | need_step_over_p, NULL); | |
2656 | ||
2657 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
2658 | ||
2659 | if (debug_threads) | |
2660 | { | |
2661 | if (need_step_over != NULL) | |
2662 | fprintf (stderr, "Not resuming all, need step over\n"); | |
2663 | else if (any_pending) | |
2664 | fprintf (stderr, | |
2665 | "Not resuming, all-stop and found " | |
2666 | "an LWP with pending status\n"); | |
2667 | else | |
2668 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
2669 | } | |
2670 | ||
2671 | /* Even if we're leaving threads stopped, queue all signals we'd | |
2672 | otherwise deliver. */ | |
2673 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
2674 | ||
2675 | if (need_step_over) | |
2676 | start_step_over (need_step_over); | |
2677 | } | |
2678 | ||
2679 | /* This function is called once per thread. We check the thread's | |
2680 | last resume request, which will tell us whether to resume, step, or | |
2681 | leave the thread stopped. Any signal the client requested to be | |
2682 | delivered has already been enqueued at this point. | |
2683 | ||
2684 | If any thread that GDB wants running is stopped at an internal | |
2685 | breakpoint that needs stepping over, we start a step-over operation | |
2686 | on that particular thread, and leave all others stopped. */ | |
2687 | ||
2688 | static void | |
2689 | proceed_one_lwp (struct inferior_list_entry *entry) | |
2690 | { | |
2691 | struct lwp_info *lwp; | |
2692 | int step; | |
2693 | ||
2694 | lwp = (struct lwp_info *) entry; | |
2695 | ||
2696 | if (debug_threads) | |
2697 | fprintf (stderr, | |
2698 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
2699 | ||
2700 | if (!lwp->stopped) | |
2701 | { | |
2702 | if (debug_threads) | |
2703 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
2704 | return; | |
2705 | } | |
2706 | ||
2707 | if (lwp->last_resume_kind == resume_stop) | |
2708 | { | |
2709 | if (debug_threads) | |
2710 | fprintf (stderr, " client wants LWP %ld stopped\n", lwpid_of (lwp)); | |
2711 | return; | |
2712 | } | |
2713 | ||
2714 | if (lwp->status_pending_p) | |
2715 | { | |
2716 | if (debug_threads) | |
2717 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
2718 | lwpid_of (lwp)); | |
2719 | return; | |
2720 | } | |
2721 | ||
2722 | if (lwp->suspended) | |
2723 | { | |
2724 | if (debug_threads) | |
2725 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
2726 | return; | |
2727 | } | |
2728 | ||
2729 | step = lwp->last_resume_kind == resume_step; | |
2730 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
2731 | } | |
2732 | ||
2733 | /* When we finish a step-over, set threads running again. If there's | |
2734 | another thread that may need a step-over, now's the time to start | |
2735 | it. Eventually, we'll move all threads past their breakpoints. */ | |
2736 | ||
2737 | static void | |
2738 | proceed_all_lwps (void) | |
2739 | { | |
2740 | struct lwp_info *need_step_over; | |
2741 | ||
2742 | /* If there is a thread which would otherwise be resumed, which is | |
2743 | stopped at a breakpoint that needs stepping over, then don't | |
2744 | resume any threads - have it step over the breakpoint with all | |
2745 | other threads stopped, then resume all threads again. */ | |
2746 | ||
2747 | if (supports_breakpoints ()) | |
2748 | { | |
2749 | need_step_over | |
2750 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2751 | need_step_over_p, NULL); | |
2752 | ||
2753 | if (need_step_over != NULL) | |
2754 | { | |
2755 | if (debug_threads) | |
2756 | fprintf (stderr, "proceed_all_lwps: found " | |
2757 | "thread %ld needing a step-over\n", | |
2758 | lwpid_of (need_step_over)); | |
2759 | ||
2760 | start_step_over (need_step_over); | |
2761 | return; | |
2762 | } | |
2763 | } | |
5544ad89 | 2764 | |
d50171e4 PA |
2765 | if (debug_threads) |
2766 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
2767 | ||
2768 | for_each_inferior (&all_lwps, proceed_one_lwp); | |
2769 | } | |
2770 | ||
2771 | /* Stopped LWPs that the client wanted to be running, that don't have | |
2772 | pending statuses, are set to run again, except for EXCEPT, if not | |
2773 | NULL. This undoes a stop_all_lwps call. */ | |
2774 | ||
2775 | static void | |
2776 | unstop_all_lwps (struct lwp_info *except) | |
2777 | { | |
5544ad89 DJ |
2778 | if (debug_threads) |
2779 | { | |
d50171e4 PA |
2780 | if (except) |
2781 | fprintf (stderr, | |
2782 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 2783 | else |
d50171e4 PA |
2784 | fprintf (stderr, |
2785 | "unstopping all lwps\n"); | |
5544ad89 DJ |
2786 | } |
2787 | ||
d50171e4 PA |
2788 | /* Make sure proceed_one_lwp doesn't try to resume this thread. */ |
2789 | if (except != NULL) | |
2790 | ++except->suspended; | |
2791 | ||
2792 | for_each_inferior (&all_lwps, proceed_one_lwp); | |
2793 | ||
2794 | if (except != NULL) | |
2795 | --except->suspended; | |
0d62e5e8 DJ |
2796 | } |
2797 | ||
2798 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
2799 | |
2800 | int | |
0a30fbc4 | 2801 | register_addr (int regnum) |
da6d8c04 DJ |
2802 | { |
2803 | int addr; | |
2804 | ||
2ec06d2e | 2805 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
2806 | error ("Invalid register number %d.", regnum); |
2807 | ||
2ec06d2e | 2808 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2809 | |
2810 | return addr; | |
2811 | } | |
2812 | ||
58caa3dc | 2813 | /* Fetch one register. */ |
da6d8c04 | 2814 | static void |
442ea881 | 2815 | fetch_register (struct regcache *regcache, int regno) |
da6d8c04 DJ |
2816 | { |
2817 | CORE_ADDR regaddr; | |
48d93c75 | 2818 | int i, size; |
0d62e5e8 | 2819 | char *buf; |
95954743 | 2820 | int pid; |
da6d8c04 | 2821 | |
2ec06d2e | 2822 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2823 | return; |
2ec06d2e | 2824 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2825 | return; |
da6d8c04 | 2826 | |
0a30fbc4 DJ |
2827 | regaddr = register_addr (regno); |
2828 | if (regaddr == -1) | |
2829 | return; | |
95954743 PA |
2830 | |
2831 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2832 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2833 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2834 | buf = alloca (size); |
2835 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2836 | { |
2837 | errno = 0; | |
0d62e5e8 | 2838 | *(PTRACE_XFER_TYPE *) (buf + i) = |
14ce3065 DE |
2839 | ptrace (PTRACE_PEEKUSER, pid, |
2840 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2841 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2842 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
da6d8c04 DJ |
2843 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2844 | if (errno != 0) | |
f52cd8cd | 2845 | error ("reading register %d: %s", regno, strerror (errno)); |
da6d8c04 | 2846 | } |
ee1a7ae4 UW |
2847 | |
2848 | if (the_low_target.supply_ptrace_register) | |
442ea881 | 2849 | the_low_target.supply_ptrace_register (regcache, regno, buf); |
5a1f5858 | 2850 | else |
442ea881 | 2851 | supply_register (regcache, regno, buf); |
da6d8c04 DJ |
2852 | } |
2853 | ||
2854 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc | 2855 | static void |
442ea881 | 2856 | usr_fetch_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 2857 | { |
4463ce24 | 2858 | if (regno == -1) |
2ec06d2e | 2859 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 2860 | fetch_register (regcache, regno); |
da6d8c04 | 2861 | else |
442ea881 | 2862 | fetch_register (regcache, regno); |
da6d8c04 DJ |
2863 | } |
2864 | ||
2865 | /* Store our register values back into the inferior. | |
2866 | If REGNO is -1, do this for all registers. | |
2867 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc | 2868 | static void |
442ea881 | 2869 | usr_store_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 DJ |
2870 | { |
2871 | CORE_ADDR regaddr; | |
48d93c75 | 2872 | int i, size; |
0d62e5e8 | 2873 | char *buf; |
55ac2b99 | 2874 | int pid; |
da6d8c04 DJ |
2875 | |
2876 | if (regno >= 0) | |
2877 | { | |
2ec06d2e | 2878 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2879 | return; |
2880 | ||
bc1e36ca | 2881 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2882 | return; |
2883 | ||
2884 | regaddr = register_addr (regno); | |
2885 | if (regaddr == -1) | |
da6d8c04 | 2886 | return; |
da6d8c04 | 2887 | errno = 0; |
48d93c75 UW |
2888 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2889 | & - sizeof (PTRACE_XFER_TYPE); | |
2890 | buf = alloca (size); | |
2891 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2892 | |
2893 | if (the_low_target.collect_ptrace_register) | |
442ea881 | 2894 | the_low_target.collect_ptrace_register (regcache, regno, buf); |
5a1f5858 | 2895 | else |
442ea881 | 2896 | collect_register (regcache, regno, buf); |
ee1a7ae4 | 2897 | |
95954743 | 2898 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2899 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2900 | { |
0a30fbc4 | 2901 | errno = 0; |
14ce3065 DE |
2902 | ptrace (PTRACE_POKEUSER, pid, |
2903 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2904 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
2905 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
2906 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
da6d8c04 DJ |
2907 | if (errno != 0) |
2908 | { | |
1b3f6016 PA |
2909 | /* At this point, ESRCH should mean the process is |
2910 | already gone, in which case we simply ignore attempts | |
2911 | to change its registers. See also the related | |
2912 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2913 | if (errno == ESRCH) |
2914 | return; | |
2915 | ||
bc1e36ca | 2916 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
f52cd8cd | 2917 | error ("writing register %d: %s", regno, strerror (errno)); |
da6d8c04 | 2918 | } |
2ff29de4 | 2919 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2920 | } |
da6d8c04 DJ |
2921 | } |
2922 | else | |
2ec06d2e | 2923 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 2924 | usr_store_inferior_registers (regcache, regno); |
da6d8c04 | 2925 | } |
58caa3dc DJ |
2926 | #endif /* HAVE_LINUX_USRREGS */ |
2927 | ||
2928 | ||
2929 | ||
2930 | #ifdef HAVE_LINUX_REGSETS | |
2931 | ||
2932 | static int | |
442ea881 | 2933 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
2934 | { |
2935 | struct regset_info *regset; | |
e9d25b98 | 2936 | int saw_general_regs = 0; |
95954743 | 2937 | int pid; |
58caa3dc DJ |
2938 | |
2939 | regset = target_regsets; | |
2940 | ||
95954743 | 2941 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2942 | while (regset->size >= 0) |
2943 | { | |
2944 | void *buf; | |
2945 | int res; | |
2946 | ||
52fa2412 | 2947 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2948 | { |
2949 | regset ++; | |
2950 | continue; | |
2951 | } | |
2952 | ||
bca929d3 | 2953 | buf = xmalloc (regset->size); |
dfb64f85 | 2954 | #ifndef __sparc__ |
95954743 | 2955 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2956 | #else |
95954743 | 2957 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2958 | #endif |
58caa3dc DJ |
2959 | if (res < 0) |
2960 | { | |
2961 | if (errno == EIO) | |
2962 | { | |
52fa2412 UW |
2963 | /* If we get EIO on a regset, do not try it again for |
2964 | this process. */ | |
2965 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2966 | free (buf); |
52fa2412 | 2967 | continue; |
58caa3dc DJ |
2968 | } |
2969 | else | |
2970 | { | |
0d62e5e8 | 2971 | char s[256]; |
95954743 PA |
2972 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
2973 | pid); | |
0d62e5e8 | 2974 | perror (s); |
58caa3dc DJ |
2975 | } |
2976 | } | |
e9d25b98 DJ |
2977 | else if (regset->type == GENERAL_REGS) |
2978 | saw_general_regs = 1; | |
442ea881 | 2979 | regset->store_function (regcache, buf); |
58caa3dc | 2980 | regset ++; |
fdeb2a12 | 2981 | free (buf); |
58caa3dc | 2982 | } |
e9d25b98 DJ |
2983 | if (saw_general_regs) |
2984 | return 0; | |
2985 | else | |
2986 | return 1; | |
58caa3dc DJ |
2987 | } |
2988 | ||
2989 | static int | |
442ea881 | 2990 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
2991 | { |
2992 | struct regset_info *regset; | |
e9d25b98 | 2993 | int saw_general_regs = 0; |
95954743 | 2994 | int pid; |
58caa3dc DJ |
2995 | |
2996 | regset = target_regsets; | |
2997 | ||
95954743 | 2998 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2999 | while (regset->size >= 0) |
3000 | { | |
3001 | void *buf; | |
3002 | int res; | |
3003 | ||
52fa2412 | 3004 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3005 | { |
3006 | regset ++; | |
3007 | continue; | |
3008 | } | |
3009 | ||
bca929d3 | 3010 | buf = xmalloc (regset->size); |
545587ee DJ |
3011 | |
3012 | /* First fill the buffer with the current register set contents, | |
3013 | in case there are any items in the kernel's regset that are | |
3014 | not in gdbserver's regcache. */ | |
dfb64f85 | 3015 | #ifndef __sparc__ |
95954743 | 3016 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 3017 | #else |
95954743 | 3018 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 3019 | #endif |
545587ee DJ |
3020 | |
3021 | if (res == 0) | |
3022 | { | |
3023 | /* Then overlay our cached registers on that. */ | |
442ea881 | 3024 | regset->fill_function (regcache, buf); |
545587ee DJ |
3025 | |
3026 | /* Only now do we write the register set. */ | |
dfb64f85 | 3027 | #ifndef __sparc__ |
95954743 | 3028 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 3029 | #else |
95954743 | 3030 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 3031 | #endif |
545587ee DJ |
3032 | } |
3033 | ||
58caa3dc DJ |
3034 | if (res < 0) |
3035 | { | |
3036 | if (errno == EIO) | |
3037 | { | |
52fa2412 UW |
3038 | /* If we get EIO on a regset, do not try it again for |
3039 | this process. */ | |
3040 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3041 | free (buf); |
52fa2412 | 3042 | continue; |
58caa3dc | 3043 | } |
3221518c UW |
3044 | else if (errno == ESRCH) |
3045 | { | |
1b3f6016 PA |
3046 | /* At this point, ESRCH should mean the process is |
3047 | already gone, in which case we simply ignore attempts | |
3048 | to change its registers. See also the related | |
3049 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 3050 | free (buf); |
3221518c UW |
3051 | return 0; |
3052 | } | |
58caa3dc DJ |
3053 | else |
3054 | { | |
ce3a066d | 3055 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
3056 | } |
3057 | } | |
e9d25b98 DJ |
3058 | else if (regset->type == GENERAL_REGS) |
3059 | saw_general_regs = 1; | |
58caa3dc | 3060 | regset ++; |
09ec9b38 | 3061 | free (buf); |
58caa3dc | 3062 | } |
e9d25b98 DJ |
3063 | if (saw_general_regs) |
3064 | return 0; | |
3065 | else | |
3066 | return 1; | |
ce3a066d | 3067 | return 0; |
58caa3dc DJ |
3068 | } |
3069 | ||
3070 | #endif /* HAVE_LINUX_REGSETS */ | |
3071 | ||
3072 | ||
3073 | void | |
442ea881 | 3074 | linux_fetch_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3075 | { |
3076 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3077 | if (regsets_fetch_inferior_registers (regcache) == 0) |
52fa2412 | 3078 | return; |
58caa3dc DJ |
3079 | #endif |
3080 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3081 | usr_fetch_inferior_registers (regcache, regno); |
58caa3dc DJ |
3082 | #endif |
3083 | } | |
3084 | ||
3085 | void | |
442ea881 | 3086 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3087 | { |
3088 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3089 | if (regsets_store_inferior_registers (regcache) == 0) |
52fa2412 | 3090 | return; |
58caa3dc DJ |
3091 | #endif |
3092 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3093 | usr_store_inferior_registers (regcache, regno); |
58caa3dc DJ |
3094 | #endif |
3095 | } | |
3096 | ||
da6d8c04 | 3097 | |
da6d8c04 DJ |
3098 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
3099 | to debugger memory starting at MYADDR. */ | |
3100 | ||
c3e735a6 | 3101 | static int |
f450004a | 3102 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
3103 | { |
3104 | register int i; | |
3105 | /* Round starting address down to longword boundary. */ | |
3106 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
3107 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
3108 | register int count |
3109 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
3110 | / sizeof (PTRACE_XFER_TYPE); |
3111 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 3112 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 3113 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
3114 | int fd; |
3115 | char filename[64]; | |
95954743 | 3116 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
3117 | |
3118 | /* Try using /proc. Don't bother for one word. */ | |
3119 | if (len >= 3 * sizeof (long)) | |
3120 | { | |
3121 | /* We could keep this file open and cache it - possibly one per | |
3122 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 3123 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
3124 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
3125 | if (fd == -1) | |
3126 | goto no_proc; | |
3127 | ||
3128 | /* If pread64 is available, use it. It's faster if the kernel | |
3129 | supports it (only one syscall), and it's 64-bit safe even on | |
3130 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
3131 | application). */ | |
3132 | #ifdef HAVE_PREAD64 | |
3133 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
3134 | #else | |
1de1badb | 3135 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
3136 | #endif |
3137 | { | |
3138 | close (fd); | |
3139 | goto no_proc; | |
3140 | } | |
3141 | ||
3142 | close (fd); | |
3143 | return 0; | |
3144 | } | |
da6d8c04 | 3145 | |
fd462a61 | 3146 | no_proc: |
da6d8c04 DJ |
3147 | /* Read all the longwords */ |
3148 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
3149 | { | |
c3e735a6 | 3150 | errno = 0; |
14ce3065 DE |
3151 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
3152 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3153 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
3154 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
3155 | if (errno) |
3156 | return errno; | |
da6d8c04 DJ |
3157 | } |
3158 | ||
3159 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
3160 | memcpy (myaddr, |
3161 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
3162 | len); | |
c3e735a6 DJ |
3163 | |
3164 | return 0; | |
da6d8c04 DJ |
3165 | } |
3166 | ||
93ae6fdc PA |
3167 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
3168 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
3169 | returns the value of errno. */ |
3170 | ||
ce3a066d | 3171 | static int |
f450004a | 3172 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
3173 | { |
3174 | register int i; | |
3175 | /* Round starting address down to longword boundary. */ | |
3176 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
3177 | /* Round ending address up; get number of longwords that makes. */ | |
3178 | register int count | |
3179 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
3180 | /* Allocate buffer of that many longwords. */ | |
3181 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 3182 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 3183 | |
0d62e5e8 DJ |
3184 | if (debug_threads) |
3185 | { | |
58d6951d DJ |
3186 | /* Dump up to four bytes. */ |
3187 | unsigned int val = * (unsigned int *) myaddr; | |
3188 | if (len == 1) | |
3189 | val = val & 0xff; | |
3190 | else if (len == 2) | |
3191 | val = val & 0xffff; | |
3192 | else if (len == 3) | |
3193 | val = val & 0xffffff; | |
3194 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
3195 | val, (long)memaddr); | |
0d62e5e8 DJ |
3196 | } |
3197 | ||
da6d8c04 DJ |
3198 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
3199 | ||
93ae6fdc | 3200 | errno = 0; |
14ce3065 DE |
3201 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
3202 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3203 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
3204 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
3205 | if (errno) |
3206 | return errno; | |
da6d8c04 DJ |
3207 | |
3208 | if (count > 1) | |
3209 | { | |
93ae6fdc | 3210 | errno = 0; |
da6d8c04 | 3211 | buffer[count - 1] |
95954743 | 3212 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
3213 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3214 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3215 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
3216 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 3217 | 0); |
93ae6fdc PA |
3218 | if (errno) |
3219 | return errno; | |
da6d8c04 DJ |
3220 | } |
3221 | ||
93ae6fdc | 3222 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 DJ |
3223 | |
3224 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
3225 | ||
3226 | /* Write the entire buffer. */ | |
3227 | ||
3228 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
3229 | { | |
3230 | errno = 0; | |
14ce3065 DE |
3231 | ptrace (PTRACE_POKETEXT, pid, |
3232 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3233 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3234 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
3235 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
3236 | if (errno) |
3237 | return errno; | |
3238 | } | |
3239 | ||
3240 | return 0; | |
3241 | } | |
2f2893d9 | 3242 | |
6076632b | 3243 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
3244 | static int linux_supports_tracefork_flag; |
3245 | ||
51c2684e | 3246 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 3247 | |
51c2684e DJ |
3248 | static int |
3249 | linux_tracefork_grandchild (void *arg) | |
3250 | { | |
3251 | _exit (0); | |
3252 | } | |
3253 | ||
7407e2de AS |
3254 | #define STACK_SIZE 4096 |
3255 | ||
51c2684e DJ |
3256 | static int |
3257 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
3258 | { |
3259 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
3260 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
3261 | |
3262 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
3263 | ||
3264 | if (fork () == 0) | |
3265 | linux_tracefork_grandchild (NULL); | |
3266 | ||
3267 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3268 | ||
7407e2de AS |
3269 | #ifdef __ia64__ |
3270 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
3271 | CLONE_VM | SIGCHLD, NULL); | |
3272 | #else | |
3273 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
3274 | CLONE_VM | SIGCHLD, NULL); | |
3275 | #endif | |
e4b7f41c JK |
3276 | |
3277 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3278 | ||
24a09b5f DJ |
3279 | _exit (0); |
3280 | } | |
3281 | ||
24a09b5f DJ |
3282 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
3283 | sure that we can enable the option, and that it had the desired | |
3284 | effect. */ | |
3285 | ||
3286 | static void | |
3287 | linux_test_for_tracefork (void) | |
3288 | { | |
3289 | int child_pid, ret, status; | |
3290 | long second_pid; | |
e4b7f41c | 3291 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 3292 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 3293 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
3294 | |
3295 | linux_supports_tracefork_flag = 0; | |
3296 | ||
e4b7f41c JK |
3297 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
3298 | ||
3299 | child_pid = fork (); | |
3300 | if (child_pid == 0) | |
3301 | linux_tracefork_child (NULL); | |
3302 | ||
3303 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3304 | ||
51c2684e | 3305 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
3306 | #ifdef __ia64__ |
3307 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
3308 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 3309 | #else /* !__ia64__ */ |
7407e2de AS |
3310 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
3311 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
3312 | #endif /* !__ia64__ */ |
3313 | ||
3314 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3315 | ||
24a09b5f | 3316 | if (child_pid == -1) |
51c2684e | 3317 | perror_with_name ("clone"); |
24a09b5f DJ |
3318 | |
3319 | ret = my_waitpid (child_pid, &status, 0); | |
3320 | if (ret == -1) | |
3321 | perror_with_name ("waitpid"); | |
3322 | else if (ret != child_pid) | |
3323 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
3324 | if (! WIFSTOPPED (status)) | |
3325 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
3326 | ||
14ce3065 DE |
3327 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
3328 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
3329 | if (ret != 0) |
3330 | { | |
3331 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
3332 | if (ret != 0) | |
3333 | { | |
3334 | warning ("linux_test_for_tracefork: failed to kill child"); | |
3335 | return; | |
3336 | } | |
3337 | ||
3338 | ret = my_waitpid (child_pid, &status, 0); | |
3339 | if (ret != child_pid) | |
3340 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
3341 | else if (!WIFSIGNALED (status)) | |
3342 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
3343 | "killed child", status); | |
3344 | ||
3345 | return; | |
3346 | } | |
3347 | ||
3348 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
3349 | if (ret != 0) | |
3350 | warning ("linux_test_for_tracefork: failed to resume child"); | |
3351 | ||
3352 | ret = my_waitpid (child_pid, &status, 0); | |
3353 | ||
3354 | if (ret == child_pid && WIFSTOPPED (status) | |
3355 | && status >> 16 == PTRACE_EVENT_FORK) | |
3356 | { | |
3357 | second_pid = 0; | |
3358 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
3359 | if (ret == 0 && second_pid != 0) | |
3360 | { | |
3361 | int second_status; | |
3362 | ||
3363 | linux_supports_tracefork_flag = 1; | |
3364 | my_waitpid (second_pid, &second_status, 0); | |
3365 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
3366 | if (ret != 0) | |
3367 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
3368 | my_waitpid (second_pid, &status, 0); | |
3369 | } | |
3370 | } | |
3371 | else | |
3372 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
3373 | "(%d, status 0x%x)", ret, status); | |
3374 | ||
3375 | do | |
3376 | { | |
3377 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
3378 | if (ret != 0) | |
3379 | warning ("linux_test_for_tracefork: failed to kill child"); | |
3380 | my_waitpid (child_pid, &status, 0); | |
3381 | } | |
3382 | while (WIFSTOPPED (status)); | |
51c2684e | 3383 | |
e4b7f41c | 3384 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 3385 | free (stack); |
e4b7f41c | 3386 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
3387 | } |
3388 | ||
3389 | ||
2f2893d9 DJ |
3390 | static void |
3391 | linux_look_up_symbols (void) | |
3392 | { | |
0d62e5e8 | 3393 | #ifdef USE_THREAD_DB |
95954743 PA |
3394 | struct process_info *proc = current_process (); |
3395 | ||
cdbfd419 | 3396 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
3397 | return; |
3398 | ||
6076632b DE |
3399 | /* If the kernel supports tracing forks then it also supports tracing |
3400 | clones, and then we don't need to use the magic thread event breakpoint | |
3401 | to learn about threads. */ | |
cdbfd419 | 3402 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
3403 | #endif |
3404 | } | |
3405 | ||
e5379b03 | 3406 | static void |
ef57601b | 3407 | linux_request_interrupt (void) |
e5379b03 | 3408 | { |
a1928bad | 3409 | extern unsigned long signal_pid; |
e5379b03 | 3410 | |
95954743 PA |
3411 | if (!ptid_equal (cont_thread, null_ptid) |
3412 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 3413 | { |
54a0b537 | 3414 | struct lwp_info *lwp; |
bd99dc85 | 3415 | int lwpid; |
e5379b03 | 3416 | |
54a0b537 | 3417 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
3418 | lwpid = lwpid_of (lwp); |
3419 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
3420 | } |
3421 | else | |
ef57601b | 3422 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
3423 | } |
3424 | ||
aa691b87 RM |
3425 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
3426 | to debugger memory starting at MYADDR. */ | |
3427 | ||
3428 | static int | |
f450004a | 3429 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
3430 | { |
3431 | char filename[PATH_MAX]; | |
3432 | int fd, n; | |
95954743 | 3433 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 3434 | |
95954743 | 3435 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
3436 | |
3437 | fd = open (filename, O_RDONLY); | |
3438 | if (fd < 0) | |
3439 | return -1; | |
3440 | ||
3441 | if (offset != (CORE_ADDR) 0 | |
3442 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
3443 | n = -1; | |
3444 | else | |
3445 | n = read (fd, myaddr, len); | |
3446 | ||
3447 | close (fd); | |
3448 | ||
3449 | return n; | |
3450 | } | |
3451 | ||
d993e290 PA |
3452 | /* These breakpoint and watchpoint related wrapper functions simply |
3453 | pass on the function call if the target has registered a | |
3454 | corresponding function. */ | |
e013ee27 OF |
3455 | |
3456 | static int | |
d993e290 | 3457 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 3458 | { |
d993e290 PA |
3459 | if (the_low_target.insert_point != NULL) |
3460 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
3461 | else |
3462 | /* Unsupported (see target.h). */ | |
3463 | return 1; | |
3464 | } | |
3465 | ||
3466 | static int | |
d993e290 | 3467 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 3468 | { |
d993e290 PA |
3469 | if (the_low_target.remove_point != NULL) |
3470 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
3471 | else |
3472 | /* Unsupported (see target.h). */ | |
3473 | return 1; | |
3474 | } | |
3475 | ||
3476 | static int | |
3477 | linux_stopped_by_watchpoint (void) | |
3478 | { | |
c3adc08c PA |
3479 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
3480 | ||
3481 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
3482 | } |
3483 | ||
3484 | static CORE_ADDR | |
3485 | linux_stopped_data_address (void) | |
3486 | { | |
c3adc08c PA |
3487 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
3488 | ||
3489 | return lwp->stopped_data_address; | |
e013ee27 OF |
3490 | } |
3491 | ||
42c81e2a | 3492 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
3493 | #if defined(__mcoldfire__) |
3494 | /* These should really be defined in the kernel's ptrace.h header. */ | |
3495 | #define PT_TEXT_ADDR 49*4 | |
3496 | #define PT_DATA_ADDR 50*4 | |
3497 | #define PT_TEXT_END_ADDR 51*4 | |
3498 | #endif | |
3499 | ||
3500 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
3501 | to tell gdb about. */ | |
3502 | ||
3503 | static int | |
3504 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
3505 | { | |
3506 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
3507 | unsigned long text, text_end, data; | |
bd99dc85 | 3508 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
3509 | |
3510 | errno = 0; | |
3511 | ||
3512 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
3513 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
3514 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
3515 | ||
3516 | if (errno == 0) | |
3517 | { | |
3518 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
3519 | used by gdb) are relative to the beginning of the program, |
3520 | with the data segment immediately following the text segment. | |
3521 | However, the actual runtime layout in memory may put the data | |
3522 | somewhere else, so when we send gdb a data base-address, we | |
3523 | use the real data base address and subtract the compile-time | |
3524 | data base-address from it (which is just the length of the | |
3525 | text segment). BSS immediately follows data in both | |
3526 | cases. */ | |
52fb6437 NS |
3527 | *text_p = text; |
3528 | *data_p = data - (text_end - text); | |
1b3f6016 | 3529 | |
52fb6437 NS |
3530 | return 1; |
3531 | } | |
3532 | #endif | |
3533 | return 0; | |
3534 | } | |
3535 | #endif | |
3536 | ||
dc146f7c VP |
3537 | static int |
3538 | compare_ints (const void *xa, const void *xb) | |
3539 | { | |
3540 | int a = *(const int *)xa; | |
3541 | int b = *(const int *)xb; | |
3542 | ||
3543 | return a - b; | |
3544 | } | |
3545 | ||
3546 | static int * | |
3547 | unique (int *b, int *e) | |
3548 | { | |
3549 | int *d = b; | |
3550 | while (++b != e) | |
3551 | if (*d != *b) | |
3552 | *++d = *b; | |
3553 | return ++d; | |
3554 | } | |
3555 | ||
3556 | /* Given PID, iterates over all threads in that process. | |
3557 | ||
3558 | Information about each thread, in a format suitable for qXfer:osdata:thread | |
3559 | is printed to BUFFER, if it's not NULL. BUFFER is assumed to be already | |
3560 | initialized, and the caller is responsible for finishing and appending '\0' | |
3561 | to it. | |
3562 | ||
3563 | The list of cores that threads are running on is assigned to *CORES, if it | |
3564 | is not NULL. If no cores are found, *CORES will be set to NULL. Caller | |
3565 | should free *CORES. */ | |
3566 | ||
3567 | static void | |
3568 | list_threads (int pid, struct buffer *buffer, char **cores) | |
3569 | { | |
3570 | int count = 0; | |
3571 | int allocated = 10; | |
3572 | int *core_numbers = xmalloc (sizeof (int) * allocated); | |
3573 | char pathname[128]; | |
3574 | DIR *dir; | |
3575 | struct dirent *dp; | |
3576 | struct stat statbuf; | |
3577 | ||
3578 | sprintf (pathname, "/proc/%d/task", pid); | |
3579 | if (stat (pathname, &statbuf) == 0 && S_ISDIR (statbuf.st_mode)) | |
3580 | { | |
3581 | dir = opendir (pathname); | |
3582 | if (!dir) | |
3583 | { | |
3584 | free (core_numbers); | |
3585 | return; | |
3586 | } | |
3587 | ||
3588 | while ((dp = readdir (dir)) != NULL) | |
3589 | { | |
3590 | unsigned long lwp = strtoul (dp->d_name, NULL, 10); | |
3591 | ||
3592 | if (lwp != 0) | |
3593 | { | |
3594 | unsigned core = linux_core_of_thread (ptid_build (pid, lwp, 0)); | |
3595 | ||
3596 | if (core != -1) | |
3597 | { | |
3598 | char s[sizeof ("4294967295")]; | |
3599 | sprintf (s, "%u", core); | |
3600 | ||
3601 | if (count == allocated) | |
3602 | { | |
3603 | allocated *= 2; | |
3604 | core_numbers = realloc (core_numbers, | |
3605 | sizeof (int) * allocated); | |
3606 | } | |
3607 | core_numbers[count++] = core; | |
3608 | if (buffer) | |
3609 | buffer_xml_printf (buffer, | |
3610 | "<item>" | |
3611 | "<column name=\"pid\">%d</column>" | |
3612 | "<column name=\"tid\">%s</column>" | |
3613 | "<column name=\"core\">%s</column>" | |
3614 | "</item>", pid, dp->d_name, s); | |
3615 | } | |
3616 | else | |
3617 | { | |
3618 | if (buffer) | |
3619 | buffer_xml_printf (buffer, | |
3620 | "<item>" | |
3621 | "<column name=\"pid\">%d</column>" | |
3622 | "<column name=\"tid\">%s</column>" | |
3623 | "</item>", pid, dp->d_name); | |
3624 | } | |
3625 | } | |
3626 | } | |
3627 | } | |
3628 | ||
3629 | if (cores) | |
3630 | { | |
3631 | *cores = NULL; | |
3632 | if (count > 0) | |
3633 | { | |
3634 | struct buffer buffer2; | |
3635 | int *b; | |
3636 | int *e; | |
3637 | qsort (core_numbers, count, sizeof (int), compare_ints); | |
3638 | ||
3639 | /* Remove duplicates. */ | |
3640 | b = core_numbers; | |
3641 | e = unique (b, core_numbers + count); | |
3642 | ||
3643 | buffer_init (&buffer2); | |
3644 | ||
3645 | for (b = core_numbers; b != e; ++b) | |
3646 | { | |
3647 | char number[sizeof ("4294967295")]; | |
3648 | sprintf (number, "%u", *b); | |
3649 | buffer_xml_printf (&buffer2, "%s%s", | |
3650 | (b == core_numbers) ? "" : ",", number); | |
3651 | } | |
3652 | buffer_grow_str0 (&buffer2, ""); | |
3653 | ||
3654 | *cores = buffer_finish (&buffer2); | |
3655 | } | |
3656 | } | |
3657 | free (core_numbers); | |
3658 | } | |
3659 | ||
3660 | static void | |
3661 | show_process (int pid, const char *username, struct buffer *buffer) | |
3662 | { | |
3663 | char pathname[128]; | |
3664 | FILE *f; | |
3665 | char cmd[MAXPATHLEN + 1]; | |
3666 | ||
3667 | sprintf (pathname, "/proc/%d/cmdline", pid); | |
3668 | ||
3669 | if ((f = fopen (pathname, "r")) != NULL) | |
3670 | { | |
3671 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
3672 | if (len > 0) | |
3673 | { | |
3674 | char *cores = 0; | |
3675 | int i; | |
3676 | for (i = 0; i < len; i++) | |
3677 | if (cmd[i] == '\0') | |
3678 | cmd[i] = ' '; | |
3679 | cmd[len] = '\0'; | |
3680 | ||
3681 | buffer_xml_printf (buffer, | |
3682 | "<item>" | |
3683 | "<column name=\"pid\">%d</column>" | |
3684 | "<column name=\"user\">%s</column>" | |
3685 | "<column name=\"command\">%s</column>", | |
3686 | pid, | |
3687 | username, | |
3688 | cmd); | |
3689 | ||
3690 | /* This only collects core numbers, and does not print threads. */ | |
3691 | list_threads (pid, NULL, &cores); | |
3692 | ||
3693 | if (cores) | |
3694 | { | |
3695 | buffer_xml_printf (buffer, | |
3696 | "<column name=\"cores\">%s</column>", cores); | |
3697 | free (cores); | |
3698 | } | |
3699 | ||
3700 | buffer_xml_printf (buffer, "</item>"); | |
3701 | } | |
3702 | fclose (f); | |
3703 | } | |
3704 | } | |
3705 | ||
07e059b5 VP |
3706 | static int |
3707 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
3708 | unsigned char *readbuf, unsigned const char *writebuf, |
3709 | CORE_ADDR offset, int len) | |
07e059b5 VP |
3710 | { |
3711 | /* We make the process list snapshot when the object starts to be | |
3712 | read. */ | |
3713 | static const char *buf; | |
3714 | static long len_avail = -1; | |
3715 | static struct buffer buffer; | |
dc146f7c VP |
3716 | int processes = 0; |
3717 | int threads = 0; | |
07e059b5 VP |
3718 | |
3719 | DIR *dirp; | |
3720 | ||
dc146f7c VP |
3721 | if (strcmp (annex, "processes") == 0) |
3722 | processes = 1; | |
3723 | else if (strcmp (annex, "threads") == 0) | |
3724 | threads = 1; | |
3725 | else | |
07e059b5 VP |
3726 | return 0; |
3727 | ||
3728 | if (!readbuf || writebuf) | |
3729 | return 0; | |
3730 | ||
3731 | if (offset == 0) | |
3732 | { | |
3733 | if (len_avail != -1 && len_avail != 0) | |
3734 | buffer_free (&buffer); | |
3735 | len_avail = 0; | |
3736 | buf = NULL; | |
3737 | buffer_init (&buffer); | |
dc146f7c VP |
3738 | if (processes) |
3739 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
3740 | else if (threads) | |
3741 | buffer_grow_str (&buffer, "<osdata type=\"threads\">"); | |
07e059b5 VP |
3742 | |
3743 | dirp = opendir ("/proc"); | |
3744 | if (dirp) | |
3745 | { | |
1b3f6016 PA |
3746 | struct dirent *dp; |
3747 | while ((dp = readdir (dirp)) != NULL) | |
3748 | { | |
3749 | struct stat statbuf; | |
3750 | char procentry[sizeof ("/proc/4294967295")]; | |
3751 | ||
3752 | if (!isdigit (dp->d_name[0]) | |
3753 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
3754 | continue; | |
3755 | ||
3756 | sprintf (procentry, "/proc/%s", dp->d_name); | |
3757 | if (stat (procentry, &statbuf) == 0 | |
3758 | && S_ISDIR (statbuf.st_mode)) | |
3759 | { | |
dc146f7c | 3760 | int pid = (int) strtoul (dp->d_name, NULL, 10); |
1b3f6016 | 3761 | |
dc146f7c | 3762 | if (processes) |
1b3f6016 | 3763 | { |
dc146f7c VP |
3764 | struct passwd *entry = getpwuid (statbuf.st_uid); |
3765 | show_process (pid, entry ? entry->pw_name : "?", &buffer); | |
3766 | } | |
3767 | else if (threads) | |
3768 | { | |
3769 | list_threads (pid, &buffer, NULL); | |
1b3f6016 PA |
3770 | } |
3771 | } | |
3772 | } | |
07e059b5 | 3773 | |
1b3f6016 | 3774 | closedir (dirp); |
07e059b5 VP |
3775 | } |
3776 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
3777 | buf = buffer_finish (&buffer); | |
3778 | len_avail = strlen (buf); | |
3779 | } | |
3780 | ||
3781 | if (offset >= len_avail) | |
3782 | { | |
3783 | /* Done. Get rid of the data. */ | |
3784 | buffer_free (&buffer); | |
3785 | buf = NULL; | |
3786 | len_avail = 0; | |
3787 | return 0; | |
3788 | } | |
3789 | ||
3790 | if (len > len_avail - offset) | |
3791 | len = len_avail - offset; | |
3792 | memcpy (readbuf, buf + offset, len); | |
3793 | ||
3794 | return len; | |
3795 | } | |
3796 | ||
d0722149 DE |
3797 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3798 | layout of the inferiors' architecture. */ | |
3799 | ||
3800 | static void | |
3801 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
3802 | { | |
3803 | int done = 0; | |
3804 | ||
3805 | if (the_low_target.siginfo_fixup != NULL) | |
3806 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
3807 | ||
3808 | /* If there was no callback, or the callback didn't do anything, | |
3809 | then just do a straight memcpy. */ | |
3810 | if (!done) | |
3811 | { | |
3812 | if (direction == 1) | |
3813 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3814 | else | |
3815 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3816 | } | |
3817 | } | |
3818 | ||
4aa995e1 PA |
3819 | static int |
3820 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
3821 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
3822 | { | |
d0722149 | 3823 | int pid; |
4aa995e1 | 3824 | struct siginfo siginfo; |
d0722149 | 3825 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3826 | |
3827 | if (current_inferior == NULL) | |
3828 | return -1; | |
3829 | ||
bd99dc85 | 3830 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
3831 | |
3832 | if (debug_threads) | |
d0722149 | 3833 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
3834 | readbuf != NULL ? "Reading" : "Writing", |
3835 | pid); | |
3836 | ||
3837 | if (offset > sizeof (siginfo)) | |
3838 | return -1; | |
3839 | ||
3840 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
3841 | return -1; | |
3842 | ||
d0722149 DE |
3843 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
3844 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3845 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
3846 | with a 32-bit GDBSERVER, we need to convert it. */ | |
3847 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3848 | ||
4aa995e1 PA |
3849 | if (offset + len > sizeof (siginfo)) |
3850 | len = sizeof (siginfo) - offset; | |
3851 | ||
3852 | if (readbuf != NULL) | |
d0722149 | 3853 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3854 | else |
3855 | { | |
d0722149 DE |
3856 | memcpy (inf_siginfo + offset, writebuf, len); |
3857 | ||
3858 | /* Convert back to ptrace layout before flushing it out. */ | |
3859 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3860 | ||
4aa995e1 PA |
3861 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
3862 | return -1; | |
3863 | } | |
3864 | ||
3865 | return len; | |
3866 | } | |
3867 | ||
bd99dc85 PA |
3868 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
3869 | so we notice when children change state; as the handler for the | |
3870 | sigsuspend in my_waitpid. */ | |
3871 | ||
3872 | static void | |
3873 | sigchld_handler (int signo) | |
3874 | { | |
3875 | int old_errno = errno; | |
3876 | ||
3877 | if (debug_threads) | |
3878 | /* fprintf is not async-signal-safe, so call write directly. */ | |
3879 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
3880 | ||
3881 | if (target_is_async_p ()) | |
3882 | async_file_mark (); /* trigger a linux_wait */ | |
3883 | ||
3884 | errno = old_errno; | |
3885 | } | |
3886 | ||
3887 | static int | |
3888 | linux_supports_non_stop (void) | |
3889 | { | |
3890 | return 1; | |
3891 | } | |
3892 | ||
3893 | static int | |
3894 | linux_async (int enable) | |
3895 | { | |
3896 | int previous = (linux_event_pipe[0] != -1); | |
3897 | ||
3898 | if (previous != enable) | |
3899 | { | |
3900 | sigset_t mask; | |
3901 | sigemptyset (&mask); | |
3902 | sigaddset (&mask, SIGCHLD); | |
3903 | ||
3904 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
3905 | ||
3906 | if (enable) | |
3907 | { | |
3908 | if (pipe (linux_event_pipe) == -1) | |
3909 | fatal ("creating event pipe failed."); | |
3910 | ||
3911 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
3912 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
3913 | ||
3914 | /* Register the event loop handler. */ | |
3915 | add_file_handler (linux_event_pipe[0], | |
3916 | handle_target_event, NULL); | |
3917 | ||
3918 | /* Always trigger a linux_wait. */ | |
3919 | async_file_mark (); | |
3920 | } | |
3921 | else | |
3922 | { | |
3923 | delete_file_handler (linux_event_pipe[0]); | |
3924 | ||
3925 | close (linux_event_pipe[0]); | |
3926 | close (linux_event_pipe[1]); | |
3927 | linux_event_pipe[0] = -1; | |
3928 | linux_event_pipe[1] = -1; | |
3929 | } | |
3930 | ||
3931 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
3932 | } | |
3933 | ||
3934 | return previous; | |
3935 | } | |
3936 | ||
3937 | static int | |
3938 | linux_start_non_stop (int nonstop) | |
3939 | { | |
3940 | /* Register or unregister from event-loop accordingly. */ | |
3941 | linux_async (nonstop); | |
3942 | return 0; | |
3943 | } | |
3944 | ||
cf8fd78b PA |
3945 | static int |
3946 | linux_supports_multi_process (void) | |
3947 | { | |
3948 | return 1; | |
3949 | } | |
3950 | ||
efcbbd14 UW |
3951 | |
3952 | /* Enumerate spufs IDs for process PID. */ | |
3953 | static int | |
3954 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
3955 | { | |
3956 | int pos = 0; | |
3957 | int written = 0; | |
3958 | char path[128]; | |
3959 | DIR *dir; | |
3960 | struct dirent *entry; | |
3961 | ||
3962 | sprintf (path, "/proc/%ld/fd", pid); | |
3963 | dir = opendir (path); | |
3964 | if (!dir) | |
3965 | return -1; | |
3966 | ||
3967 | rewinddir (dir); | |
3968 | while ((entry = readdir (dir)) != NULL) | |
3969 | { | |
3970 | struct stat st; | |
3971 | struct statfs stfs; | |
3972 | int fd; | |
3973 | ||
3974 | fd = atoi (entry->d_name); | |
3975 | if (!fd) | |
3976 | continue; | |
3977 | ||
3978 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
3979 | if (stat (path, &st) != 0) | |
3980 | continue; | |
3981 | if (!S_ISDIR (st.st_mode)) | |
3982 | continue; | |
3983 | ||
3984 | if (statfs (path, &stfs) != 0) | |
3985 | continue; | |
3986 | if (stfs.f_type != SPUFS_MAGIC) | |
3987 | continue; | |
3988 | ||
3989 | if (pos >= offset && pos + 4 <= offset + len) | |
3990 | { | |
3991 | *(unsigned int *)(buf + pos - offset) = fd; | |
3992 | written += 4; | |
3993 | } | |
3994 | pos += 4; | |
3995 | } | |
3996 | ||
3997 | closedir (dir); | |
3998 | return written; | |
3999 | } | |
4000 | ||
4001 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4002 | object type, using the /proc file system. */ | |
4003 | static int | |
4004 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4005 | unsigned const char *writebuf, | |
4006 | CORE_ADDR offset, int len) | |
4007 | { | |
4008 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4009 | char buf[128]; | |
4010 | int fd = 0; | |
4011 | int ret = 0; | |
4012 | ||
4013 | if (!writebuf && !readbuf) | |
4014 | return -1; | |
4015 | ||
4016 | if (!*annex) | |
4017 | { | |
4018 | if (!readbuf) | |
4019 | return -1; | |
4020 | else | |
4021 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4022 | } | |
4023 | ||
4024 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
4025 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4026 | if (fd <= 0) | |
4027 | return -1; | |
4028 | ||
4029 | if (offset != 0 | |
4030 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4031 | { | |
4032 | close (fd); | |
4033 | return 0; | |
4034 | } | |
4035 | ||
4036 | if (writebuf) | |
4037 | ret = write (fd, writebuf, (size_t) len); | |
4038 | else | |
4039 | ret = read (fd, readbuf, (size_t) len); | |
4040 | ||
4041 | close (fd); | |
4042 | return ret; | |
4043 | } | |
4044 | ||
dc146f7c VP |
4045 | static int |
4046 | linux_core_of_thread (ptid_t ptid) | |
4047 | { | |
4048 | char filename[sizeof ("/proc//task//stat") | |
4049 | + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */ | |
4050 | + 1]; | |
4051 | FILE *f; | |
4052 | char *content = NULL; | |
4053 | char *p; | |
4054 | char *ts = 0; | |
4055 | int content_read = 0; | |
4056 | int i; | |
4057 | int core; | |
4058 | ||
4059 | sprintf (filename, "/proc/%d/task/%ld/stat", | |
4060 | ptid_get_pid (ptid), ptid_get_lwp (ptid)); | |
4061 | f = fopen (filename, "r"); | |
4062 | if (!f) | |
4063 | return -1; | |
4064 | ||
4065 | for (;;) | |
4066 | { | |
4067 | int n; | |
4068 | content = realloc (content, content_read + 1024); | |
4069 | n = fread (content + content_read, 1, 1024, f); | |
4070 | content_read += n; | |
4071 | if (n < 1024) | |
4072 | { | |
4073 | content[content_read] = '\0'; | |
4074 | break; | |
4075 | } | |
4076 | } | |
4077 | ||
4078 | p = strchr (content, '('); | |
4079 | p = strchr (p, ')') + 2; /* skip ")" and a whitespace. */ | |
4080 | ||
4081 | p = strtok_r (p, " ", &ts); | |
4082 | for (i = 0; i != 36; ++i) | |
4083 | p = strtok_r (NULL, " ", &ts); | |
4084 | ||
4085 | if (sscanf (p, "%d", &core) == 0) | |
4086 | core = -1; | |
4087 | ||
4088 | free (content); | |
4089 | fclose (f); | |
4090 | ||
4091 | return core; | |
4092 | } | |
4093 | ||
ce3a066d DJ |
4094 | static struct target_ops linux_target_ops = { |
4095 | linux_create_inferior, | |
4096 | linux_attach, | |
4097 | linux_kill, | |
6ad8ae5c | 4098 | linux_detach, |
444d6139 | 4099 | linux_join, |
ce3a066d DJ |
4100 | linux_thread_alive, |
4101 | linux_resume, | |
4102 | linux_wait, | |
4103 | linux_fetch_registers, | |
4104 | linux_store_registers, | |
4105 | linux_read_memory, | |
4106 | linux_write_memory, | |
2f2893d9 | 4107 | linux_look_up_symbols, |
ef57601b | 4108 | linux_request_interrupt, |
aa691b87 | 4109 | linux_read_auxv, |
d993e290 PA |
4110 | linux_insert_point, |
4111 | linux_remove_point, | |
e013ee27 OF |
4112 | linux_stopped_by_watchpoint, |
4113 | linux_stopped_data_address, | |
42c81e2a | 4114 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 4115 | linux_read_offsets, |
dae5f5cf DJ |
4116 | #else |
4117 | NULL, | |
4118 | #endif | |
4119 | #ifdef USE_THREAD_DB | |
4120 | thread_db_get_tls_address, | |
4121 | #else | |
4122 | NULL, | |
52fb6437 | 4123 | #endif |
efcbbd14 | 4124 | linux_qxfer_spu, |
59a016f0 | 4125 | hostio_last_error_from_errno, |
07e059b5 | 4126 | linux_qxfer_osdata, |
4aa995e1 | 4127 | linux_xfer_siginfo, |
bd99dc85 PA |
4128 | linux_supports_non_stop, |
4129 | linux_async, | |
4130 | linux_start_non_stop, | |
cdbfd419 PP |
4131 | linux_supports_multi_process, |
4132 | #ifdef USE_THREAD_DB | |
dc146f7c | 4133 | thread_db_handle_monitor_command, |
cdbfd419 | 4134 | #else |
dc146f7c | 4135 | NULL, |
cdbfd419 | 4136 | #endif |
dc146f7c | 4137 | linux_core_of_thread |
ce3a066d DJ |
4138 | }; |
4139 | ||
0d62e5e8 DJ |
4140 | static void |
4141 | linux_init_signals () | |
4142 | { | |
4143 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
4144 | to find what the cancel signal actually is. */ | |
60c3d7b0 | 4145 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 4146 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 4147 | #endif |
0d62e5e8 DJ |
4148 | } |
4149 | ||
da6d8c04 DJ |
4150 | void |
4151 | initialize_low (void) | |
4152 | { | |
bd99dc85 PA |
4153 | struct sigaction sigchld_action; |
4154 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 4155 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
4156 | set_breakpoint_data (the_low_target.breakpoint, |
4157 | the_low_target.breakpoint_len); | |
0d62e5e8 | 4158 | linux_init_signals (); |
24a09b5f | 4159 | linux_test_for_tracefork (); |
52fa2412 UW |
4160 | #ifdef HAVE_LINUX_REGSETS |
4161 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
4162 | ; | |
bca929d3 | 4163 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 4164 | #endif |
bd99dc85 PA |
4165 | |
4166 | sigchld_action.sa_handler = sigchld_handler; | |
4167 | sigemptyset (&sigchld_action.sa_mask); | |
4168 | sigchld_action.sa_flags = SA_RESTART; | |
4169 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 4170 | } |