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> | |
1570b33e | 42 | #include <sys/uio.h> |
957f3f49 DE |
43 | #ifndef ELFMAG0 |
44 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
45 | then ELFMAG0 will have been defined. If it didn't get included by | |
46 | gdb_proc_service.h then including it will likely introduce a duplicate | |
47 | definition of elf_fpregset_t. */ | |
48 | #include <elf.h> | |
49 | #endif | |
efcbbd14 UW |
50 | |
51 | #ifndef SPUFS_MAGIC | |
52 | #define SPUFS_MAGIC 0x23c9b64e | |
53 | #endif | |
da6d8c04 | 54 | |
32ca6d61 DJ |
55 | #ifndef PTRACE_GETSIGINFO |
56 | # define PTRACE_GETSIGINFO 0x4202 | |
57 | # define PTRACE_SETSIGINFO 0x4203 | |
58 | #endif | |
59 | ||
fd462a61 DJ |
60 | #ifndef O_LARGEFILE |
61 | #define O_LARGEFILE 0 | |
62 | #endif | |
63 | ||
24a09b5f DJ |
64 | /* If the system headers did not provide the constants, hard-code the normal |
65 | values. */ | |
66 | #ifndef PTRACE_EVENT_FORK | |
67 | ||
68 | #define PTRACE_SETOPTIONS 0x4200 | |
69 | #define PTRACE_GETEVENTMSG 0x4201 | |
70 | ||
71 | /* options set using PTRACE_SETOPTIONS */ | |
72 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
73 | #define PTRACE_O_TRACEFORK 0x00000002 | |
74 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
75 | #define PTRACE_O_TRACECLONE 0x00000008 | |
76 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
77 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 | |
78 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
79 | ||
80 | /* Wait extended result codes for the above trace options. */ | |
81 | #define PTRACE_EVENT_FORK 1 | |
82 | #define PTRACE_EVENT_VFORK 2 | |
83 | #define PTRACE_EVENT_CLONE 3 | |
84 | #define PTRACE_EVENT_EXEC 4 | |
85 | #define PTRACE_EVENT_VFORK_DONE 5 | |
86 | #define PTRACE_EVENT_EXIT 6 | |
87 | ||
88 | #endif /* PTRACE_EVENT_FORK */ | |
89 | ||
90 | /* We can't always assume that this flag is available, but all systems | |
91 | with the ptrace event handlers also have __WALL, so it's safe to use | |
92 | in some contexts. */ | |
93 | #ifndef __WALL | |
94 | #define __WALL 0x40000000 /* Wait for any child. */ | |
95 | #endif | |
96 | ||
ec8ebe72 DE |
97 | #ifndef W_STOPCODE |
98 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
99 | #endif | |
100 | ||
42c81e2a DJ |
101 | #ifdef __UCLIBC__ |
102 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
103 | #define HAS_NOMMU | |
104 | #endif | |
105 | #endif | |
106 | ||
24a09b5f DJ |
107 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
108 | representation of the thread ID. | |
611cb4a5 | 109 | |
54a0b537 | 110 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
111 | the same as the LWP ID. |
112 | ||
113 | ``all_processes'' is keyed by the "overall process ID", which | |
114 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 115 | |
54a0b537 | 116 | struct inferior_list all_lwps; |
0d62e5e8 | 117 | |
24a09b5f DJ |
118 | /* A list of all unknown processes which receive stop signals. Some other |
119 | process will presumably claim each of these as forked children | |
120 | momentarily. */ | |
121 | ||
122 | struct inferior_list stopped_pids; | |
123 | ||
0d62e5e8 DJ |
124 | /* FIXME this is a bit of a hack, and could be removed. */ |
125 | int stopping_threads; | |
126 | ||
127 | /* FIXME make into a target method? */ | |
24a09b5f | 128 | int using_threads = 1; |
24a09b5f | 129 | |
95954743 PA |
130 | /* This flag is true iff we've just created or attached to our first |
131 | inferior but it has not stopped yet. As soon as it does, we need | |
132 | to call the low target's arch_setup callback. Doing this only on | |
133 | the first inferior avoids reinializing the architecture on every | |
134 | inferior, and avoids messing with the register caches of the | |
135 | already running inferiors. NOTE: this assumes all inferiors under | |
136 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
137 | static int new_inferior; |
138 | ||
2acc282a | 139 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 140 | int step, int signal, siginfo_t *info); |
2bd7c093 | 141 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
54a0b537 | 142 | static void stop_all_lwps (void); |
95954743 | 143 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 144 | static void *add_lwp (ptid_t ptid); |
c35fafde | 145 | static int linux_stopped_by_watchpoint (void); |
95954743 | 146 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
dc146f7c | 147 | static int linux_core_of_thread (ptid_t ptid); |
d50171e4 PA |
148 | static void proceed_all_lwps (void); |
149 | static void unstop_all_lwps (struct lwp_info *except); | |
d50171e4 PA |
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 | ||
bdabb078 PA |
515 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
516 | && !lwp->stepping | |
517 | && !lwp->stopped_by_watchpoint | |
518 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
519 | stop_pc -= the_low_target.decr_pc_after_break; |
520 | ||
521 | if (debug_threads) | |
522 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
523 | ||
524 | return stop_pc; | |
0d62e5e8 | 525 | } |
ce3a066d | 526 | |
0d62e5e8 | 527 | static void * |
95954743 | 528 | add_lwp (ptid_t ptid) |
611cb4a5 | 529 | { |
54a0b537 | 530 | struct lwp_info *lwp; |
0d62e5e8 | 531 | |
54a0b537 PA |
532 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
533 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 534 | |
95954743 | 535 | lwp->head.id = ptid; |
0d62e5e8 | 536 | |
d50171e4 PA |
537 | lwp->last_resume_kind = resume_continue; |
538 | ||
aa5ca48f DE |
539 | if (the_low_target.new_thread != NULL) |
540 | lwp->arch_private = the_low_target.new_thread (); | |
541 | ||
54a0b537 | 542 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 543 | |
54a0b537 | 544 | return lwp; |
0d62e5e8 | 545 | } |
611cb4a5 | 546 | |
da6d8c04 DJ |
547 | /* Start an inferior process and returns its pid. |
548 | ALLARGS is a vector of program-name and args. */ | |
549 | ||
ce3a066d DJ |
550 | static int |
551 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 552 | { |
a6dbe5df | 553 | struct lwp_info *new_lwp; |
da6d8c04 | 554 | int pid; |
95954743 | 555 | ptid_t ptid; |
da6d8c04 | 556 | |
42c81e2a | 557 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
558 | pid = vfork (); |
559 | #else | |
da6d8c04 | 560 | pid = fork (); |
52fb6437 | 561 | #endif |
da6d8c04 DJ |
562 | if (pid < 0) |
563 | perror_with_name ("fork"); | |
564 | ||
565 | if (pid == 0) | |
566 | { | |
567 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
568 | ||
60c3d7b0 | 569 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 570 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 571 | #endif |
0d62e5e8 | 572 | |
a9fa9f7d DJ |
573 | setpgid (0, 0); |
574 | ||
2b876972 DJ |
575 | execv (program, allargs); |
576 | if (errno == ENOENT) | |
577 | execvp (program, allargs); | |
da6d8c04 DJ |
578 | |
579 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 580 | strerror (errno)); |
da6d8c04 DJ |
581 | fflush (stderr); |
582 | _exit (0177); | |
583 | } | |
584 | ||
95954743 PA |
585 | linux_add_process (pid, 0); |
586 | ||
587 | ptid = ptid_build (pid, pid, 0); | |
588 | new_lwp = add_lwp (ptid); | |
589 | add_thread (ptid, new_lwp); | |
a6dbe5df | 590 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 591 | |
a9fa9f7d | 592 | return pid; |
da6d8c04 DJ |
593 | } |
594 | ||
595 | /* Attach to an inferior process. */ | |
596 | ||
95954743 PA |
597 | static void |
598 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 599 | { |
95954743 | 600 | ptid_t ptid; |
54a0b537 | 601 | struct lwp_info *new_lwp; |
611cb4a5 | 602 | |
95954743 | 603 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 604 | { |
95954743 | 605 | if (!initial) |
2d717e4f DJ |
606 | { |
607 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 608 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
609 | strerror (errno), errno); |
610 | fflush (stderr); | |
611 | return; | |
612 | } | |
613 | else | |
614 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 615 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 616 | strerror (errno), errno); |
da6d8c04 DJ |
617 | } |
618 | ||
95954743 PA |
619 | if (initial) |
620 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
621 | ptid = ptid_build (lwpid, lwpid, 0); | |
622 | else | |
623 | { | |
624 | /* Note that extracting the pid from the current inferior is | |
625 | safe, since we're always called in the context of the same | |
626 | process as this new thread. */ | |
627 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
628 | ptid = ptid_build (pid, lwpid, 0); | |
629 | } | |
24a09b5f | 630 | |
95954743 PA |
631 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
632 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 633 | |
a6dbe5df PA |
634 | /* We need to wait for SIGSTOP before being able to make the next |
635 | ptrace call on this LWP. */ | |
636 | new_lwp->must_set_ptrace_flags = 1; | |
637 | ||
0d62e5e8 | 638 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
639 | brings it to a halt. |
640 | ||
641 | There are several cases to consider here: | |
642 | ||
643 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 644 | of a new thread that is being created. |
d50171e4 PA |
645 | In this case we should ignore that SIGSTOP and resume the |
646 | process. This is handled below by setting stop_expected = 1, | |
647 | and the fact that add_lwp sets last_resume_kind == | |
648 | resume_continue. | |
0e21c1ec DE |
649 | |
650 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
651 | to it via attach_inferior. |
652 | In this case we want the process thread to stop. | |
d50171e4 PA |
653 | This is handled by having linux_attach set last_resume_kind == |
654 | resume_stop after we return. | |
1b3f6016 PA |
655 | ??? If the process already has several threads we leave the other |
656 | threads running. | |
0e21c1ec DE |
657 | |
658 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
659 | existing threads. |
660 | In this case we want the thread to stop. | |
661 | FIXME: This case is currently not properly handled. | |
662 | We should wait for the SIGSTOP but don't. Things work apparently | |
663 | because enough time passes between when we ptrace (ATTACH) and when | |
664 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
665 | |
666 | On the other hand, if we are currently trying to stop all threads, we | |
667 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 668 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
669 | end of the list, and so the new thread has not yet reached |
670 | wait_for_sigstop (but will). */ | |
d50171e4 | 671 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
672 | } |
673 | ||
95954743 PA |
674 | void |
675 | linux_attach_lwp (unsigned long lwpid) | |
676 | { | |
677 | linux_attach_lwp_1 (lwpid, 0); | |
678 | } | |
679 | ||
0d62e5e8 | 680 | int |
a1928bad | 681 | linux_attach (unsigned long pid) |
0d62e5e8 | 682 | { |
54a0b537 | 683 | struct lwp_info *lwp; |
0d62e5e8 | 684 | |
95954743 PA |
685 | linux_attach_lwp_1 (pid, 1); |
686 | ||
687 | linux_add_process (pid, 1); | |
0d62e5e8 | 688 | |
bd99dc85 PA |
689 | if (!non_stop) |
690 | { | |
691 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
692 | process. It will be collected by wait shortly. */ | |
95954743 PA |
693 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
694 | ptid_build (pid, pid, 0)); | |
d50171e4 | 695 | lwp->last_resume_kind = resume_stop; |
bd99dc85 | 696 | } |
0d62e5e8 | 697 | |
95954743 PA |
698 | return 0; |
699 | } | |
700 | ||
701 | struct counter | |
702 | { | |
703 | int pid; | |
704 | int count; | |
705 | }; | |
706 | ||
707 | static int | |
708 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
709 | { | |
710 | struct counter *counter = args; | |
711 | ||
712 | if (ptid_get_pid (entry->id) == counter->pid) | |
713 | { | |
714 | if (++counter->count > 1) | |
715 | return 1; | |
716 | } | |
d61ddec4 | 717 | |
da6d8c04 DJ |
718 | return 0; |
719 | } | |
720 | ||
95954743 PA |
721 | static int |
722 | last_thread_of_process_p (struct thread_info *thread) | |
723 | { | |
724 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
725 | int pid = ptid_get_pid (ptid); | |
726 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 727 | |
95954743 PA |
728 | return (find_inferior (&all_threads, |
729 | second_thread_of_pid_p, &counter) == NULL); | |
730 | } | |
731 | ||
732 | /* Kill the inferior lwp. */ | |
733 | ||
734 | static int | |
735 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 736 | { |
0d62e5e8 | 737 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 738 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 739 | int wstat; |
95954743 PA |
740 | int pid = * (int *) args; |
741 | ||
742 | if (ptid_get_pid (entry->id) != pid) | |
743 | return 0; | |
0d62e5e8 | 744 | |
fd500816 DJ |
745 | /* We avoid killing the first thread here, because of a Linux kernel (at |
746 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
747 | the children get a chance to be reaped, it will remain a zombie | |
748 | forever. */ | |
95954743 | 749 | |
12b42a12 | 750 | if (lwpid_of (lwp) == pid) |
95954743 PA |
751 | { |
752 | if (debug_threads) | |
753 | fprintf (stderr, "lkop: is last of process %s\n", | |
754 | target_pid_to_str (entry->id)); | |
755 | return 0; | |
756 | } | |
fd500816 | 757 | |
bd99dc85 PA |
758 | /* If we're killing a running inferior, make sure it is stopped |
759 | first, as PTRACE_KILL will not work otherwise. */ | |
760 | if (!lwp->stopped) | |
761 | send_sigstop (&lwp->head); | |
762 | ||
0d62e5e8 DJ |
763 | do |
764 | { | |
bd99dc85 | 765 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
766 | |
767 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 768 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 769 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
770 | |
771 | return 0; | |
da6d8c04 DJ |
772 | } |
773 | ||
95954743 PA |
774 | static int |
775 | linux_kill (int pid) | |
0d62e5e8 | 776 | { |
95954743 | 777 | struct process_info *process; |
54a0b537 | 778 | struct lwp_info *lwp; |
95954743 | 779 | struct thread_info *thread; |
fd500816 | 780 | int wstat; |
95954743 | 781 | int lwpid; |
fd500816 | 782 | |
95954743 PA |
783 | process = find_process_pid (pid); |
784 | if (process == NULL) | |
785 | return -1; | |
9d606399 | 786 | |
95954743 | 787 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 788 | |
54a0b537 | 789 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 790 | thread in the list, so do so now. */ |
95954743 PA |
791 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
792 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
793 | |
794 | if (debug_threads) | |
95954743 PA |
795 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
796 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
797 | |
798 | /* If we're killing a running inferior, make sure it is stopped | |
799 | first, as PTRACE_KILL will not work otherwise. */ | |
800 | if (!lwp->stopped) | |
801 | send_sigstop (&lwp->head); | |
802 | ||
fd500816 DJ |
803 | do |
804 | { | |
bd99dc85 | 805 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
806 | |
807 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
808 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
809 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 810 | |
ca5c370d PA |
811 | #ifdef USE_THREAD_DB |
812 | thread_db_free (process, 0); | |
813 | #endif | |
bd99dc85 | 814 | delete_lwp (lwp); |
ca5c370d | 815 | linux_remove_process (process); |
95954743 | 816 | return 0; |
0d62e5e8 DJ |
817 | } |
818 | ||
95954743 PA |
819 | static int |
820 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
821 | { |
822 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 823 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
824 | int pid = * (int *) args; |
825 | ||
826 | if (ptid_get_pid (entry->id) != pid) | |
827 | return 0; | |
6ad8ae5c | 828 | |
bd99dc85 PA |
829 | /* If we're detaching from a running inferior, make sure it is |
830 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
831 | if (!lwp->stopped) | |
832 | { | |
95954743 | 833 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
834 | |
835 | stopping_threads = 1; | |
836 | send_sigstop (&lwp->head); | |
837 | ||
838 | /* If this detects a new thread through a clone event, the new | |
839 | thread is appended to the end of the lwp list, so we'll | |
840 | eventually detach from it. */ | |
841 | wait_for_sigstop (&lwp->head); | |
842 | stopping_threads = 0; | |
843 | ||
844 | /* If LWP exits while we're trying to stop it, there's nothing | |
845 | left to do. */ | |
95954743 | 846 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 847 | if (lwp == NULL) |
95954743 | 848 | return 0; |
bd99dc85 PA |
849 | } |
850 | ||
ae13219e DJ |
851 | /* If this process is stopped but is expecting a SIGSTOP, then make |
852 | sure we take care of that now. This isn't absolutely guaranteed | |
853 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 854 | if (lwp->stop_expected) |
ae13219e | 855 | { |
bd99dc85 | 856 | int wstat; |
ae13219e | 857 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
858 | lwp->stop_expected = 0; |
859 | if (lwp->stopped) | |
2acc282a | 860 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 861 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
862 | } |
863 | ||
864 | /* Flush any pending changes to the process's registers. */ | |
865 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 866 | get_lwp_thread (lwp)); |
ae13219e DJ |
867 | |
868 | /* Finally, let it resume. */ | |
bd99dc85 PA |
869 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
870 | ||
871 | delete_lwp (lwp); | |
95954743 | 872 | return 0; |
6ad8ae5c DJ |
873 | } |
874 | ||
dd6953e1 | 875 | static int |
95954743 | 876 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 877 | { |
95954743 PA |
878 | int *pid_p = args; |
879 | ||
880 | if (ptid_get_pid (entry->id) == *pid_p) | |
881 | return 1; | |
882 | ||
883 | return 0; | |
884 | } | |
885 | ||
886 | static int | |
887 | linux_detach (int pid) | |
888 | { | |
889 | struct process_info *process; | |
890 | ||
891 | process = find_process_pid (pid); | |
892 | if (process == NULL) | |
893 | return -1; | |
894 | ||
ca5c370d PA |
895 | #ifdef USE_THREAD_DB |
896 | thread_db_free (process, 1); | |
897 | #endif | |
898 | ||
95954743 PA |
899 | current_inferior = |
900 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
901 | ||
ae13219e | 902 | delete_all_breakpoints (); |
95954743 | 903 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
ca5c370d | 904 | linux_remove_process (process); |
dd6953e1 | 905 | return 0; |
6ad8ae5c DJ |
906 | } |
907 | ||
444d6139 | 908 | static void |
95954743 | 909 | linux_join (int pid) |
444d6139 | 910 | { |
444d6139 | 911 | int status, ret; |
95954743 | 912 | struct process_info *process; |
bd99dc85 | 913 | |
95954743 PA |
914 | process = find_process_pid (pid); |
915 | if (process == NULL) | |
916 | return; | |
444d6139 PA |
917 | |
918 | do { | |
95954743 | 919 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
920 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
921 | break; | |
922 | } while (ret != -1 || errno != ECHILD); | |
923 | } | |
924 | ||
6ad8ae5c | 925 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 926 | static int |
95954743 | 927 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 928 | { |
95954743 PA |
929 | struct lwp_info *lwp = find_lwp_pid (ptid); |
930 | ||
931 | /* We assume we always know if a thread exits. If a whole process | |
932 | exited but we still haven't been able to report it to GDB, we'll | |
933 | hold on to the last lwp of the dead process. */ | |
934 | if (lwp != NULL) | |
935 | return !lwp->dead; | |
0d62e5e8 DJ |
936 | else |
937 | return 0; | |
938 | } | |
939 | ||
6bf5e0ba | 940 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 941 | static int |
d50171e4 | 942 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 943 | { |
54a0b537 | 944 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 945 | ptid_t ptid = * (ptid_t *) arg; |
d50171e4 | 946 | struct thread_info *thread = get_lwp_thread (lwp); |
95954743 PA |
947 | |
948 | /* Check if we're only interested in events from a specific process | |
949 | or its lwps. */ | |
950 | if (!ptid_equal (minus_one_ptid, ptid) | |
951 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
952 | return 0; | |
0d62e5e8 | 953 | |
d50171e4 PA |
954 | thread = get_lwp_thread (lwp); |
955 | ||
956 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
957 | report any status pending the LWP may have. */ | |
958 | if (lwp->last_resume_kind == resume_stop | |
959 | && thread->last_status.kind == TARGET_WAITKIND_STOPPED) | |
960 | return 0; | |
0d62e5e8 | 961 | |
d50171e4 | 962 | return lwp->status_pending_p; |
0d62e5e8 DJ |
963 | } |
964 | ||
95954743 PA |
965 | static int |
966 | same_lwp (struct inferior_list_entry *entry, void *data) | |
967 | { | |
968 | ptid_t ptid = *(ptid_t *) data; | |
969 | int lwp; | |
970 | ||
971 | if (ptid_get_lwp (ptid) != 0) | |
972 | lwp = ptid_get_lwp (ptid); | |
973 | else | |
974 | lwp = ptid_get_pid (ptid); | |
975 | ||
976 | if (ptid_get_lwp (entry->id) == lwp) | |
977 | return 1; | |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
982 | struct lwp_info * | |
983 | find_lwp_pid (ptid_t ptid) | |
984 | { | |
985 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
986 | } | |
987 | ||
bd99dc85 | 988 | static struct lwp_info * |
95954743 | 989 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 990 | { |
0d62e5e8 | 991 | int ret; |
95954743 | 992 | int to_wait_for = -1; |
bd99dc85 | 993 | struct lwp_info *child = NULL; |
0d62e5e8 | 994 | |
bd99dc85 | 995 | if (debug_threads) |
95954743 PA |
996 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
997 | ||
998 | if (ptid_equal (ptid, minus_one_ptid)) | |
999 | to_wait_for = -1; /* any child */ | |
1000 | else | |
1001 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1002 | |
bd99dc85 | 1003 | options |= __WALL; |
0d62e5e8 | 1004 | |
bd99dc85 | 1005 | retry: |
0d62e5e8 | 1006 | |
bd99dc85 PA |
1007 | ret = my_waitpid (to_wait_for, wstatp, options); |
1008 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1009 | return NULL; | |
1010 | else if (ret == -1) | |
1011 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1012 | |
1013 | if (debug_threads | |
1014 | && (!WIFSTOPPED (*wstatp) | |
1015 | || (WSTOPSIG (*wstatp) != 32 | |
1016 | && WSTOPSIG (*wstatp) != 33))) | |
1017 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1018 | ||
95954743 | 1019 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1020 | |
24a09b5f DJ |
1021 | /* If we didn't find a process, one of two things presumably happened: |
1022 | - A process we started and then detached from has exited. Ignore it. | |
1023 | - A process we are controlling has forked and the new child's stop | |
1024 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1025 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1026 | { |
1027 | add_pid_to_list (&stopped_pids, ret); | |
1028 | goto retry; | |
1029 | } | |
bd99dc85 | 1030 | else if (child == NULL) |
24a09b5f DJ |
1031 | goto retry; |
1032 | ||
bd99dc85 | 1033 | child->stopped = 1; |
0d62e5e8 | 1034 | |
bd99dc85 | 1035 | child->last_status = *wstatp; |
32ca6d61 | 1036 | |
d61ddec4 UW |
1037 | /* Architecture-specific setup after inferior is running. |
1038 | This needs to happen after we have attached to the inferior | |
1039 | and it is stopped for the first time, but before we access | |
1040 | any inferior registers. */ | |
1041 | if (new_inferior) | |
1042 | { | |
1043 | the_low_target.arch_setup (); | |
52fa2412 UW |
1044 | #ifdef HAVE_LINUX_REGSETS |
1045 | memset (disabled_regsets, 0, num_regsets); | |
1046 | #endif | |
d61ddec4 UW |
1047 | new_inferior = 0; |
1048 | } | |
1049 | ||
c3adc08c PA |
1050 | /* Fetch the possibly triggered data watchpoint info and store it in |
1051 | CHILD. | |
1052 | ||
1053 | On some archs, like x86, that use debug registers to set | |
1054 | watchpoints, it's possible that the way to know which watched | |
1055 | address trapped, is to check the register that is used to select | |
1056 | which address to watch. Problem is, between setting the | |
1057 | watchpoint and reading back which data address trapped, the user | |
1058 | may change the set of watchpoints, and, as a consequence, GDB | |
1059 | changes the debug registers in the inferior. To avoid reading | |
1060 | back a stale stopped-data-address when that happens, we cache in | |
1061 | LP the fact that a watchpoint trapped, and the corresponding data | |
1062 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1063 | changes the debug registers meanwhile, we have the cached data we | |
1064 | can rely on. */ | |
1065 | ||
1066 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1067 | { | |
1068 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1069 | { | |
1070 | child->stopped_by_watchpoint = 0; | |
1071 | } | |
1072 | else | |
1073 | { | |
1074 | struct thread_info *saved_inferior; | |
1075 | ||
1076 | saved_inferior = current_inferior; | |
1077 | current_inferior = get_lwp_thread (child); | |
1078 | ||
1079 | child->stopped_by_watchpoint | |
1080 | = the_low_target.stopped_by_watchpoint (); | |
1081 | ||
1082 | if (child->stopped_by_watchpoint) | |
1083 | { | |
1084 | if (the_low_target.stopped_data_address != NULL) | |
1085 | child->stopped_data_address | |
1086 | = the_low_target.stopped_data_address (); | |
1087 | else | |
1088 | child->stopped_data_address = 0; | |
1089 | } | |
1090 | ||
1091 | current_inferior = saved_inferior; | |
1092 | } | |
1093 | } | |
1094 | ||
d50171e4 PA |
1095 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1096 | architecture being defined already (so that CHILD has a valid | |
1097 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1098 | not). */ | |
1099 | if (WIFSTOPPED (*wstatp)) | |
1100 | child->stop_pc = get_stop_pc (child); | |
1101 | ||
0d62e5e8 | 1102 | if (debug_threads |
47c0c975 DE |
1103 | && WIFSTOPPED (*wstatp) |
1104 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1105 | { |
896c7fbb | 1106 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1107 | struct regcache *regcache; |
47c0c975 DE |
1108 | CORE_ADDR pc; |
1109 | ||
d50171e4 | 1110 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1111 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1112 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1113 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1114 | current_inferior = saved_inferior; |
0d62e5e8 | 1115 | } |
bd99dc85 PA |
1116 | |
1117 | return child; | |
0d62e5e8 | 1118 | } |
611cb4a5 | 1119 | |
d50171e4 PA |
1120 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1121 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1122 | will handle the current event, eventually we will resume this LWP, | |
1123 | and this breakpoint will trap again. */ | |
1124 | ||
1125 | static int | |
1126 | cancel_breakpoint (struct lwp_info *lwp) | |
1127 | { | |
1128 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1129 | |
1130 | /* There's nothing to do if we don't support breakpoints. */ | |
1131 | if (!supports_breakpoints ()) | |
1132 | return 0; | |
1133 | ||
d50171e4 PA |
1134 | /* breakpoint_at reads from current inferior. */ |
1135 | saved_inferior = current_inferior; | |
1136 | current_inferior = get_lwp_thread (lwp); | |
1137 | ||
1138 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1139 | { | |
1140 | if (debug_threads) | |
1141 | fprintf (stderr, | |
1142 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1143 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1144 | |
1145 | /* Back up the PC if necessary. */ | |
1146 | if (the_low_target.decr_pc_after_break) | |
1147 | { | |
1148 | struct regcache *regcache | |
fc7238bb | 1149 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1150 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1151 | } | |
1152 | ||
1153 | current_inferior = saved_inferior; | |
1154 | return 1; | |
1155 | } | |
1156 | else | |
1157 | { | |
1158 | if (debug_threads) | |
1159 | fprintf (stderr, | |
1160 | "CB: No breakpoint found at %s for [%s]\n", | |
1161 | paddress (lwp->stop_pc), | |
fc7238bb | 1162 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1163 | } |
1164 | ||
1165 | current_inferior = saved_inferior; | |
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | /* When the event-loop is doing a step-over, this points at the thread | |
1170 | being stepped. */ | |
1171 | ptid_t step_over_bkpt; | |
1172 | ||
bd99dc85 PA |
1173 | /* Wait for an event from child PID. If PID is -1, wait for any |
1174 | child. Store the stop status through the status pointer WSTAT. | |
1175 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1176 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1177 | the stopped child otherwise. */ | |
1178 | ||
0d62e5e8 | 1179 | static int |
95954743 | 1180 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1181 | { |
d50171e4 PA |
1182 | struct lwp_info *event_child, *requested_child; |
1183 | ||
d50171e4 PA |
1184 | event_child = NULL; |
1185 | requested_child = NULL; | |
0d62e5e8 | 1186 | |
95954743 | 1187 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1188 | |
95954743 PA |
1189 | if (ptid_equal (ptid, minus_one_ptid) |
1190 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1191 | { |
54a0b537 | 1192 | event_child = (struct lwp_info *) |
d50171e4 | 1193 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1194 | if (debug_threads && event_child) |
bd99dc85 | 1195 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1196 | } |
1197 | else | |
1198 | { | |
95954743 | 1199 | requested_child = find_lwp_pid (ptid); |
d50171e4 PA |
1200 | |
1201 | if (requested_child->status_pending_p) | |
bd99dc85 | 1202 | event_child = requested_child; |
0d62e5e8 | 1203 | } |
611cb4a5 | 1204 | |
0d62e5e8 DJ |
1205 | if (event_child != NULL) |
1206 | { | |
bd99dc85 PA |
1207 | if (debug_threads) |
1208 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1209 | lwpid_of (event_child), event_child->status_pending); | |
1210 | *wstat = event_child->status_pending; | |
1211 | event_child->status_pending_p = 0; | |
1212 | event_child->status_pending = 0; | |
1213 | current_inferior = get_lwp_thread (event_child); | |
1214 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1215 | } |
1216 | ||
1217 | /* We only enter this loop if no process has a pending wait status. Thus | |
1218 | any action taken in response to a wait status inside this loop is | |
1219 | responding as soon as we detect the status, not after any pending | |
1220 | events. */ | |
1221 | while (1) | |
1222 | { | |
6bf5e0ba | 1223 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1224 | |
bd99dc85 | 1225 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1226 | { |
1227 | if (debug_threads) | |
1228 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1229 | return 0; | |
1230 | } | |
0d62e5e8 DJ |
1231 | |
1232 | if (event_child == NULL) | |
1233 | error ("event from unknown child"); | |
611cb4a5 | 1234 | |
bd99dc85 | 1235 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1236 | |
89be2091 | 1237 | /* Check for thread exit. */ |
bd99dc85 | 1238 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1239 | { |
89be2091 | 1240 | if (debug_threads) |
95954743 | 1241 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1242 | |
1243 | /* If the last thread is exiting, just return. */ | |
95954743 | 1244 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1245 | { |
1246 | if (debug_threads) | |
95954743 PA |
1247 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1248 | lwpid_of (event_child)); | |
bd99dc85 PA |
1249 | return lwpid_of (event_child); |
1250 | } | |
89be2091 | 1251 | |
bd99dc85 PA |
1252 | if (!non_stop) |
1253 | { | |
1254 | current_inferior = (struct thread_info *) all_threads.head; | |
1255 | if (debug_threads) | |
1256 | fprintf (stderr, "Current inferior is now %ld\n", | |
1257 | lwpid_of (get_thread_lwp (current_inferior))); | |
1258 | } | |
1259 | else | |
1260 | { | |
1261 | current_inferior = NULL; | |
1262 | if (debug_threads) | |
1263 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1264 | } | |
89be2091 DJ |
1265 | |
1266 | /* If we were waiting for this particular child to do something... | |
1267 | well, it did something. */ | |
bd99dc85 | 1268 | if (requested_child != NULL) |
d50171e4 PA |
1269 | { |
1270 | int lwpid = lwpid_of (event_child); | |
1271 | ||
1272 | /* Cancel the step-over operation --- the thread that | |
1273 | started it is gone. */ | |
1274 | if (finish_step_over (event_child)) | |
1275 | unstop_all_lwps (event_child); | |
1276 | delete_lwp (event_child); | |
1277 | return lwpid; | |
1278 | } | |
1279 | ||
1280 | delete_lwp (event_child); | |
89be2091 DJ |
1281 | |
1282 | /* Wait for a more interesting event. */ | |
1283 | continue; | |
1284 | } | |
1285 | ||
a6dbe5df PA |
1286 | if (event_child->must_set_ptrace_flags) |
1287 | { | |
1288 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
14ce3065 | 1289 | 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); |
a6dbe5df PA |
1290 | event_child->must_set_ptrace_flags = 0; |
1291 | } | |
1292 | ||
bd99dc85 PA |
1293 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1294 | && *wstat >> 16 != 0) | |
24a09b5f | 1295 | { |
bd99dc85 | 1296 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1297 | continue; |
1298 | } | |
1299 | ||
89be2091 DJ |
1300 | /* If GDB is not interested in this signal, don't stop other |
1301 | threads, and don't report it to GDB. Just resume the | |
1302 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1303 | signals as well as any that GDB specifically requested we |
1304 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1305 | and do not ignore signals when stepping - they may require | |
1306 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1307 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1308 | thread library? */ | |
bd99dc85 | 1309 | if (WIFSTOPPED (*wstat) |
69f223ed | 1310 | && !event_child->stepping |
24a09b5f | 1311 | && ( |
60c3d7b0 | 1312 | #if defined (USE_THREAD_DB) && defined (__SIGRTMIN) |
cdbfd419 | 1313 | (current_process ()->private->thread_db != NULL |
bd99dc85 PA |
1314 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1315 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1316 | || |
1317 | #endif | |
bd99dc85 | 1318 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
d50171e4 PA |
1319 | && !(WSTOPSIG (*wstat) == SIGSTOP |
1320 | && event_child->stop_expected)))) | |
89be2091 DJ |
1321 | { |
1322 | siginfo_t info, *info_p; | |
1323 | ||
1324 | if (debug_threads) | |
24a09b5f | 1325 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1326 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1327 | |
bd99dc85 | 1328 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1329 | info_p = &info; |
1330 | else | |
1331 | info_p = NULL; | |
d50171e4 | 1332 | linux_resume_one_lwp (event_child, event_child->stepping, |
bd99dc85 | 1333 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1334 | continue; |
0d62e5e8 | 1335 | } |
611cb4a5 | 1336 | |
d50171e4 PA |
1337 | if (WIFSTOPPED (*wstat) |
1338 | && WSTOPSIG (*wstat) == SIGSTOP | |
1339 | && event_child->stop_expected) | |
1340 | { | |
1341 | int should_stop; | |
1342 | ||
1343 | if (debug_threads) | |
1344 | fprintf (stderr, "Expected stop.\n"); | |
1345 | event_child->stop_expected = 0; | |
1346 | ||
1347 | should_stop = (event_child->last_resume_kind == resume_stop | |
1348 | || stopping_threads); | |
1349 | ||
1350 | if (!should_stop) | |
1351 | { | |
1352 | linux_resume_one_lwp (event_child, | |
1353 | event_child->stepping, 0, NULL); | |
1354 | continue; | |
1355 | } | |
1356 | } | |
1357 | ||
bd99dc85 | 1358 | return lwpid_of (event_child); |
611cb4a5 | 1359 | } |
0d62e5e8 | 1360 | |
611cb4a5 DJ |
1361 | /* NOTREACHED */ |
1362 | return 0; | |
1363 | } | |
1364 | ||
95954743 PA |
1365 | static int |
1366 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1367 | { | |
1368 | ptid_t wait_ptid; | |
1369 | ||
1370 | if (ptid_is_pid (ptid)) | |
1371 | { | |
1372 | /* A request to wait for a specific tgid. This is not possible | |
1373 | with waitpid, so instead, we wait for any child, and leave | |
1374 | children we're not interested in right now with a pending | |
1375 | status to report later. */ | |
1376 | wait_ptid = minus_one_ptid; | |
1377 | } | |
1378 | else | |
1379 | wait_ptid = ptid; | |
1380 | ||
1381 | while (1) | |
1382 | { | |
1383 | int event_pid; | |
1384 | ||
1385 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1386 | ||
1387 | if (event_pid > 0 | |
1388 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1389 | { | |
1390 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1391 | ||
1392 | if (! WIFSTOPPED (*wstat)) | |
1393 | mark_lwp_dead (event_child, *wstat); | |
1394 | else | |
1395 | { | |
1396 | event_child->status_pending_p = 1; | |
1397 | event_child->status_pending = *wstat; | |
1398 | } | |
1399 | } | |
1400 | else | |
1401 | return event_pid; | |
1402 | } | |
1403 | } | |
1404 | ||
6bf5e0ba PA |
1405 | |
1406 | /* Count the LWP's that have had events. */ | |
1407 | ||
1408 | static int | |
1409 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1410 | { | |
1411 | struct lwp_info *lp = (struct lwp_info *) entry; | |
1412 | int *count = data; | |
1413 | ||
1414 | gdb_assert (count != NULL); | |
1415 | ||
1416 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1417 | should be reported to GDB. */ | |
1418 | if (get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE | |
1419 | && lp->last_resume_kind != resume_stop | |
1420 | && lp->status_pending_p | |
1421 | && WIFSTOPPED (lp->status_pending) | |
1422 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1423 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1424 | (*count)++; | |
1425 | ||
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1430 | ||
1431 | static int | |
1432 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1433 | { | |
1434 | struct lwp_info *lp = (struct lwp_info *) entry; | |
1435 | ||
1436 | if (get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE | |
1437 | && lp->last_resume_kind == resume_step | |
1438 | && lp->status_pending_p) | |
1439 | return 1; | |
1440 | else | |
1441 | return 0; | |
1442 | } | |
1443 | ||
1444 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1445 | reported to GDB. */ | |
1446 | ||
1447 | static int | |
1448 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1449 | { | |
1450 | struct lwp_info *lp = (struct lwp_info *) entry; | |
1451 | int *selector = data; | |
1452 | ||
1453 | gdb_assert (selector != NULL); | |
1454 | ||
1455 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
1456 | if (lp->last_resume_kind != resume_stop | |
1457 | && get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE | |
1458 | && lp->status_pending_p | |
1459 | && WIFSTOPPED (lp->status_pending) | |
1460 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1461 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1462 | if ((*selector)-- == 0) | |
1463 | return 1; | |
1464 | ||
1465 | return 0; | |
1466 | } | |
1467 | ||
1468 | static int | |
1469 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
1470 | { | |
1471 | struct lwp_info *lp = (struct lwp_info *) entry; | |
1472 | struct lwp_info *event_lp = data; | |
1473 | ||
1474 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1475 | if (lp == event_lp) | |
1476 | return 0; | |
1477 | ||
1478 | /* If a LWP other than the LWP that we're reporting an event for has | |
1479 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1480 | then just arrange for it to hit it again later. We don't keep | |
1481 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1482 | LWP. We will handle the current event, eventually we will resume | |
1483 | all LWPs, and this one will get its breakpoint trap again. | |
1484 | ||
1485 | If we do not do this, then we run the risk that the user will | |
1486 | delete or disable the breakpoint, but the LWP will have already | |
1487 | tripped on it. */ | |
1488 | ||
1489 | if (lp->last_resume_kind != resume_stop | |
1490 | && get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE | |
1491 | && lp->status_pending_p | |
1492 | && WIFSTOPPED (lp->status_pending) | |
1493 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
1494 | && !lp->stepping |
1495 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
1496 | && cancel_breakpoint (lp)) |
1497 | /* Throw away the SIGTRAP. */ | |
1498 | lp->status_pending_p = 0; | |
1499 | ||
1500 | return 0; | |
1501 | } | |
1502 | ||
1503 | /* Select one LWP out of those that have events pending. */ | |
1504 | ||
1505 | static void | |
1506 | select_event_lwp (struct lwp_info **orig_lp) | |
1507 | { | |
1508 | int num_events = 0; | |
1509 | int random_selector; | |
1510 | struct lwp_info *event_lp; | |
1511 | ||
1512 | /* Give preference to any LWP that is being single-stepped. */ | |
1513 | event_lp | |
1514 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1515 | select_singlestep_lwp_callback, NULL); | |
1516 | if (event_lp != NULL) | |
1517 | { | |
1518 | if (debug_threads) | |
1519 | fprintf (stderr, | |
1520 | "SEL: Select single-step %s\n", | |
1521 | target_pid_to_str (ptid_of (event_lp))); | |
1522 | } | |
1523 | else | |
1524 | { | |
1525 | /* No single-stepping LWP. Select one at random, out of those | |
1526 | which have had SIGTRAP events. */ | |
1527 | ||
1528 | /* First see how many SIGTRAP events we have. */ | |
1529 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
1530 | ||
1531 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1532 | random_selector = (int) | |
1533 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1534 | ||
1535 | if (debug_threads && num_events > 1) | |
1536 | fprintf (stderr, | |
1537 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1538 | num_events, random_selector); | |
1539 | ||
1540 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
1541 | select_event_lwp_callback, | |
1542 | &random_selector); | |
1543 | } | |
1544 | ||
1545 | if (event_lp != NULL) | |
1546 | { | |
1547 | /* Switch the event LWP. */ | |
1548 | *orig_lp = event_lp; | |
1549 | } | |
1550 | } | |
1551 | ||
d50171e4 PA |
1552 | /* Set this inferior LWP's state as "want-stopped". We won't resume |
1553 | this LWP until the client gives us another action for it. */ | |
1554 | ||
1555 | static void | |
1556 | gdb_wants_lwp_stopped (struct inferior_list_entry *entry) | |
1557 | { | |
1558 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1559 | struct thread_info *thread = get_lwp_thread (lwp); | |
1560 | ||
1561 | /* Most threads are stopped implicitly (all-stop); tag that with | |
1562 | signal 0. The thread being explicitly reported stopped to the | |
1563 | client, gets it's status fixed up afterwards. */ | |
1564 | thread->last_status.kind = TARGET_WAITKIND_STOPPED; | |
1565 | thread->last_status.value.sig = TARGET_SIGNAL_0; | |
1566 | ||
1567 | lwp->last_resume_kind = resume_stop; | |
1568 | } | |
1569 | ||
1570 | /* Set all LWP's states as "want-stopped". */ | |
1571 | ||
1572 | static void | |
1573 | gdb_wants_all_stopped (void) | |
1574 | { | |
1575 | for_each_inferior (&all_lwps, gdb_wants_lwp_stopped); | |
1576 | } | |
1577 | ||
0d62e5e8 | 1578 | /* Wait for process, returns status. */ |
da6d8c04 | 1579 | |
95954743 PA |
1580 | static ptid_t |
1581 | linux_wait_1 (ptid_t ptid, | |
1582 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1583 | { |
e5f1222d | 1584 | int w; |
fc7238bb | 1585 | struct lwp_info *event_child; |
bd99dc85 | 1586 | int options; |
bd99dc85 | 1587 | int pid; |
6bf5e0ba PA |
1588 | int step_over_finished; |
1589 | int bp_explains_trap; | |
1590 | int maybe_internal_trap; | |
1591 | int report_to_gdb; | |
bd99dc85 PA |
1592 | |
1593 | /* Translate generic target options into linux options. */ | |
1594 | options = __WALL; | |
1595 | if (target_options & TARGET_WNOHANG) | |
1596 | options |= WNOHANG; | |
0d62e5e8 DJ |
1597 | |
1598 | retry: | |
bd99dc85 PA |
1599 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1600 | ||
0d62e5e8 DJ |
1601 | /* If we were only supposed to resume one thread, only wait for |
1602 | that thread - if it's still alive. If it died, however - which | |
1603 | can happen if we're coming from the thread death case below - | |
1604 | then we need to make sure we restart the other threads. We could | |
1605 | pick a thread at random or restart all; restarting all is less | |
1606 | arbitrary. */ | |
95954743 PA |
1607 | if (!non_stop |
1608 | && !ptid_equal (cont_thread, null_ptid) | |
1609 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1610 | { |
fc7238bb PA |
1611 | struct thread_info *thread; |
1612 | ||
bd99dc85 PA |
1613 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1614 | cont_thread); | |
0d62e5e8 DJ |
1615 | |
1616 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1617 | if (thread == NULL) |
64386c31 DJ |
1618 | { |
1619 | struct thread_resume resume_info; | |
95954743 | 1620 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1621 | resume_info.kind = resume_continue; |
1622 | resume_info.sig = 0; | |
2bd7c093 | 1623 | linux_resume (&resume_info, 1); |
64386c31 | 1624 | } |
bd99dc85 | 1625 | else |
95954743 | 1626 | ptid = cont_thread; |
0d62e5e8 | 1627 | } |
da6d8c04 | 1628 | |
6bf5e0ba PA |
1629 | if (ptid_equal (step_over_bkpt, null_ptid)) |
1630 | pid = linux_wait_for_event (ptid, &w, options); | |
1631 | else | |
1632 | { | |
1633 | if (debug_threads) | |
1634 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
1635 | target_pid_to_str (step_over_bkpt)); | |
1636 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
1637 | } | |
1638 | ||
bd99dc85 | 1639 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1640 | return null_ptid; |
bd99dc85 | 1641 | |
6bf5e0ba | 1642 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 1643 | |
0d62e5e8 DJ |
1644 | /* If we are waiting for a particular child, and it exited, |
1645 | linux_wait_for_event will return its exit status. Similarly if | |
1646 | the last child exited. If this is not the last child, however, | |
1647 | do not report it as exited until there is a 'thread exited' response | |
1648 | available in the remote protocol. Instead, just wait for another event. | |
1649 | This should be safe, because if the thread crashed we will already | |
1650 | have reported the termination signal to GDB; that should stop any | |
1651 | in-progress stepping operations, etc. | |
1652 | ||
1653 | Report the exit status of the last thread to exit. This matches | |
1654 | LinuxThreads' behavior. */ | |
1655 | ||
95954743 | 1656 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1657 | { |
bd99dc85 | 1658 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1659 | { |
6bf5e0ba | 1660 | int pid = pid_of (event_child); |
95954743 | 1661 | struct process_info *process = find_process_pid (pid); |
5b1c542e | 1662 | |
ca5c370d PA |
1663 | #ifdef USE_THREAD_DB |
1664 | thread_db_free (process, 0); | |
1665 | #endif | |
6bf5e0ba | 1666 | delete_lwp (event_child); |
ca5c370d | 1667 | linux_remove_process (process); |
5b1c542e | 1668 | |
bd99dc85 | 1669 | current_inferior = NULL; |
5b1c542e | 1670 | |
bd99dc85 PA |
1671 | if (WIFEXITED (w)) |
1672 | { | |
1673 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1674 | ourstatus->value.integer = WEXITSTATUS (w); | |
1675 | ||
1676 | if (debug_threads) | |
1677 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1678 | } | |
1679 | else | |
1680 | { | |
1681 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1682 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1683 | ||
1684 | if (debug_threads) | |
1685 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1686 | ||
1687 | } | |
5b1c542e | 1688 | |
95954743 | 1689 | return pid_to_ptid (pid); |
0d62e5e8 | 1690 | } |
da6d8c04 | 1691 | } |
0d62e5e8 | 1692 | else |
da6d8c04 | 1693 | { |
0d62e5e8 DJ |
1694 | if (!WIFSTOPPED (w)) |
1695 | goto retry; | |
da6d8c04 DJ |
1696 | } |
1697 | ||
6bf5e0ba PA |
1698 | /* If this event was not handled before, and is not a SIGTRAP, we |
1699 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
1700 | a breakpoint is inserted at the current PC. If this target does | |
1701 | not support internal breakpoints at all, we also report the | |
1702 | SIGTRAP without further processing; it's of no concern to us. */ | |
1703 | maybe_internal_trap | |
1704 | = (supports_breakpoints () | |
1705 | && (WSTOPSIG (w) == SIGTRAP | |
1706 | || ((WSTOPSIG (w) == SIGILL | |
1707 | || WSTOPSIG (w) == SIGSEGV) | |
1708 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
1709 | ||
1710 | if (maybe_internal_trap) | |
1711 | { | |
1712 | /* Handle anything that requires bookkeeping before deciding to | |
1713 | report the event or continue waiting. */ | |
1714 | ||
1715 | /* First check if we can explain the SIGTRAP with an internal | |
1716 | breakpoint, or if we should possibly report the event to GDB. | |
1717 | Do this before anything that may remove or insert a | |
1718 | breakpoint. */ | |
1719 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
1720 | ||
1721 | /* We have a SIGTRAP, possibly a step-over dance has just | |
1722 | finished. If so, tweak the state machine accordingly, | |
1723 | reinsert breakpoints and delete any reinsert (software | |
1724 | single-step) breakpoints. */ | |
1725 | step_over_finished = finish_step_over (event_child); | |
1726 | ||
1727 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
1728 | check_breakpoints (event_child->stop_pc); | |
1729 | ||
1730 | if (bp_explains_trap) | |
1731 | { | |
1732 | /* If we stepped or ran into an internal breakpoint, we've | |
1733 | already handled it. So next time we resume (from this | |
1734 | PC), we should step over it. */ | |
1735 | if (debug_threads) | |
1736 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1737 | ||
8b07ae33 PA |
1738 | if (breakpoint_here (event_child->stop_pc)) |
1739 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
1740 | } |
1741 | } | |
1742 | else | |
1743 | { | |
1744 | /* We have some other signal, possibly a step-over dance was in | |
1745 | progress, and it should be cancelled too. */ | |
1746 | step_over_finished = finish_step_over (event_child); | |
1747 | } | |
1748 | ||
1749 | /* We have all the data we need. Either report the event to GDB, or | |
1750 | resume threads and keep waiting for more. */ | |
1751 | ||
1752 | /* Check If GDB would be interested in this event. If GDB wanted | |
1753 | this thread to single step, we always want to report the SIGTRAP, | |
8b07ae33 PA |
1754 | and let GDB handle it. Watchpoints should always be reported. |
1755 | So should signals we can't explain. A SIGTRAP we can't explain | |
1756 | could be a GDB breakpoint --- we may or not support Z0 | |
1757 | breakpoints. If we do, we're be able to handle GDB breakpoints | |
1758 | on top of internal breakpoints, by handling the internal | |
1759 | breakpoint and still reporting the event to GDB. If we don't, | |
1760 | we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba PA |
1761 | report_to_gdb = (!maybe_internal_trap |
1762 | || event_child->last_resume_kind == resume_step | |
1763 | || event_child->stopped_by_watchpoint | |
8b07ae33 PA |
1764 | || (!step_over_finished && !bp_explains_trap) |
1765 | || gdb_breakpoint_here (event_child->stop_pc)); | |
6bf5e0ba PA |
1766 | |
1767 | /* We found no reason GDB would want us to stop. We either hit one | |
1768 | of our own breakpoints, or finished an internal step GDB | |
1769 | shouldn't know about. */ | |
1770 | if (!report_to_gdb) | |
1771 | { | |
1772 | if (debug_threads) | |
1773 | { | |
1774 | if (bp_explains_trap) | |
1775 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1776 | if (step_over_finished) | |
1777 | fprintf (stderr, "Step-over finished.\n"); | |
1778 | } | |
1779 | ||
1780 | /* We're not reporting this breakpoint to GDB, so apply the | |
1781 | decr_pc_after_break adjustment to the inferior's regcache | |
1782 | ourselves. */ | |
1783 | ||
1784 | if (the_low_target.set_pc != NULL) | |
1785 | { | |
1786 | struct regcache *regcache | |
1787 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
1788 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
1789 | } | |
1790 | ||
1791 | /* We've finished stepping over a breakpoint. We've stopped all | |
1792 | LWPs momentarily except the stepping one. This is where we | |
1793 | resume them all again. We're going to keep waiting, so use | |
1794 | proceed, which handles stepping over the next breakpoint. */ | |
1795 | if (debug_threads) | |
1796 | fprintf (stderr, "proceeding all threads.\n"); | |
1797 | proceed_all_lwps (); | |
1798 | goto retry; | |
1799 | } | |
1800 | ||
1801 | if (debug_threads) | |
1802 | { | |
1803 | if (event_child->last_resume_kind == resume_step) | |
1804 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); | |
1805 | if (event_child->stopped_by_watchpoint) | |
1806 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
1807 | if (gdb_breakpoint_here (event_child->stop_pc)) |
1808 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
1809 | if (debug_threads) |
1810 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
1811 | } | |
1812 | ||
1813 | /* Alright, we're going to report a stop. */ | |
1814 | ||
1815 | if (!non_stop) | |
1816 | { | |
1817 | /* In all-stop, stop all threads. */ | |
1818 | stop_all_lwps (); | |
1819 | ||
1820 | /* If we're not waiting for a specific LWP, choose an event LWP | |
1821 | from among those that have had events. Giving equal priority | |
1822 | to all LWPs that have had events helps prevent | |
1823 | starvation. */ | |
1824 | if (ptid_equal (ptid, minus_one_ptid)) | |
1825 | { | |
1826 | event_child->status_pending_p = 1; | |
1827 | event_child->status_pending = w; | |
1828 | ||
1829 | select_event_lwp (&event_child); | |
1830 | ||
1831 | event_child->status_pending_p = 0; | |
1832 | w = event_child->status_pending; | |
1833 | } | |
1834 | ||
1835 | /* Now that we've selected our final event LWP, cancel any | |
1836 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
1837 | See the comment in cancel_breakpoints_callback to find out | |
1838 | why. */ | |
1839 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
1840 | } | |
1841 | else | |
1842 | { | |
1843 | /* If we just finished a step-over, then all threads had been | |
1844 | momentarily paused. In all-stop, that's fine, we want | |
1845 | threads stopped by now anyway. In non-stop, we need to | |
1846 | re-resume threads that GDB wanted to be running. */ | |
1847 | if (step_over_finished) | |
1848 | unstop_all_lwps (event_child); | |
1849 | } | |
1850 | ||
5b1c542e | 1851 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1852 | |
d50171e4 PA |
1853 | /* Do this before the gdb_wants_all_stopped calls below, since they |
1854 | always set last_resume_kind to resume_stop. */ | |
6bf5e0ba | 1855 | if (event_child->last_resume_kind == resume_stop && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
1856 | { |
1857 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1858 | and it stopped cleanly, so report as SIG0. The use of | |
1859 | SIGSTOP is an implementation detail. */ | |
1860 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1861 | } | |
6bf5e0ba | 1862 | else if (event_child->last_resume_kind == resume_stop && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
1863 | { |
1864 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 1865 | but, it stopped for other reasons. */ |
bd99dc85 PA |
1866 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
1867 | } | |
1868 | else | |
1869 | { | |
1870 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1871 | } | |
1872 | ||
d50171e4 PA |
1873 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
1874 | ||
1875 | if (!non_stop) | |
1876 | { | |
d50171e4 PA |
1877 | /* From GDB's perspective, all-stop mode always stops all |
1878 | threads implicitly. Tag all threads as "want-stopped". */ | |
1879 | gdb_wants_all_stopped (); | |
1880 | } | |
1881 | else | |
1882 | { | |
1883 | /* We're reporting this LWP as stopped. Update it's | |
1884 | "want-stopped" state to what the client wants, until it gets | |
1885 | a new resume action. */ | |
6bf5e0ba | 1886 | gdb_wants_lwp_stopped (&event_child->head); |
d50171e4 PA |
1887 | } |
1888 | ||
bd99dc85 | 1889 | if (debug_threads) |
95954743 | 1890 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 1891 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
1892 | ourstatus->kind, |
1893 | ourstatus->value.sig); | |
1894 | ||
6bf5e0ba PA |
1895 | get_lwp_thread (event_child)->last_status = *ourstatus; |
1896 | return ptid_of (event_child); | |
bd99dc85 PA |
1897 | } |
1898 | ||
1899 | /* Get rid of any pending event in the pipe. */ | |
1900 | static void | |
1901 | async_file_flush (void) | |
1902 | { | |
1903 | int ret; | |
1904 | char buf; | |
1905 | ||
1906 | do | |
1907 | ret = read (linux_event_pipe[0], &buf, 1); | |
1908 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1909 | } | |
1910 | ||
1911 | /* Put something in the pipe, so the event loop wakes up. */ | |
1912 | static void | |
1913 | async_file_mark (void) | |
1914 | { | |
1915 | int ret; | |
1916 | ||
1917 | async_file_flush (); | |
1918 | ||
1919 | do | |
1920 | ret = write (linux_event_pipe[1], "+", 1); | |
1921 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1922 | ||
1923 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1924 | be awakened anyway. */ | |
1925 | } | |
1926 | ||
95954743 PA |
1927 | static ptid_t |
1928 | linux_wait (ptid_t ptid, | |
1929 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1930 | { |
95954743 | 1931 | ptid_t event_ptid; |
bd99dc85 PA |
1932 | |
1933 | if (debug_threads) | |
95954743 | 1934 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1935 | |
1936 | /* Flush the async file first. */ | |
1937 | if (target_is_async_p ()) | |
1938 | async_file_flush (); | |
1939 | ||
95954743 | 1940 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1941 | |
1942 | /* If at least one stop was reported, there may be more. A single | |
1943 | SIGCHLD can signal more than one child stop. */ | |
1944 | if (target_is_async_p () | |
1945 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1946 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1947 | async_file_mark (); |
1948 | ||
1949 | return event_ptid; | |
da6d8c04 DJ |
1950 | } |
1951 | ||
c5f62d5f | 1952 | /* Send a signal to an LWP. */ |
fd500816 DJ |
1953 | |
1954 | static int | |
a1928bad | 1955 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 1956 | { |
c5f62d5f DE |
1957 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1958 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 1959 | |
c5f62d5f DE |
1960 | #ifdef __NR_tkill |
1961 | { | |
1962 | static int tkill_failed; | |
fd500816 | 1963 | |
c5f62d5f DE |
1964 | if (!tkill_failed) |
1965 | { | |
1966 | int ret; | |
1967 | ||
1968 | errno = 0; | |
1969 | ret = syscall (__NR_tkill, lwpid, signo); | |
1970 | if (errno != ENOSYS) | |
1971 | return ret; | |
1972 | tkill_failed = 1; | |
1973 | } | |
1974 | } | |
fd500816 DJ |
1975 | #endif |
1976 | ||
1977 | return kill (lwpid, signo); | |
1978 | } | |
1979 | ||
0d62e5e8 DJ |
1980 | static void |
1981 | send_sigstop (struct inferior_list_entry *entry) | |
1982 | { | |
54a0b537 | 1983 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1984 | int pid; |
0d62e5e8 | 1985 | |
54a0b537 | 1986 | if (lwp->stopped) |
0d62e5e8 DJ |
1987 | return; |
1988 | ||
bd99dc85 PA |
1989 | pid = lwpid_of (lwp); |
1990 | ||
0d62e5e8 DJ |
1991 | /* If we already have a pending stop signal for this process, don't |
1992 | send another. */ | |
54a0b537 | 1993 | if (lwp->stop_expected) |
0d62e5e8 | 1994 | { |
ae13219e | 1995 | if (debug_threads) |
bd99dc85 | 1996 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 1997 | |
0d62e5e8 DJ |
1998 | return; |
1999 | } | |
2000 | ||
2001 | if (debug_threads) | |
bd99dc85 | 2002 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2003 | |
d50171e4 | 2004 | lwp->stop_expected = 1; |
bd99dc85 | 2005 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2006 | } |
2007 | ||
95954743 PA |
2008 | static void |
2009 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2010 | { | |
2011 | /* It's dead, really. */ | |
2012 | lwp->dead = 1; | |
2013 | ||
2014 | /* Store the exit status for later. */ | |
2015 | lwp->status_pending_p = 1; | |
2016 | lwp->status_pending = wstat; | |
2017 | ||
95954743 PA |
2018 | /* Prevent trying to stop it. */ |
2019 | lwp->stopped = 1; | |
2020 | ||
2021 | /* No further stops are expected from a dead lwp. */ | |
2022 | lwp->stop_expected = 0; | |
2023 | } | |
2024 | ||
0d62e5e8 DJ |
2025 | static void |
2026 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2027 | { | |
54a0b537 | 2028 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2029 | struct thread_info *saved_inferior; |
a1928bad | 2030 | int wstat; |
95954743 PA |
2031 | ptid_t saved_tid; |
2032 | ptid_t ptid; | |
d50171e4 | 2033 | int pid; |
0d62e5e8 | 2034 | |
54a0b537 | 2035 | if (lwp->stopped) |
d50171e4 PA |
2036 | { |
2037 | if (debug_threads) | |
2038 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2039 | lwpid_of (lwp)); | |
2040 | return; | |
2041 | } | |
0d62e5e8 DJ |
2042 | |
2043 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2044 | if (saved_inferior != NULL) |
2045 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2046 | else | |
95954743 | 2047 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2048 | |
95954743 | 2049 | ptid = lwp->head.id; |
bd99dc85 | 2050 | |
d50171e4 PA |
2051 | if (debug_threads) |
2052 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2053 | ||
2054 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2055 | |
2056 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2057 | and record the pending SIGSTOP. If the process exited, just | |
2058 | return. */ | |
d50171e4 | 2059 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2060 | { |
2061 | if (debug_threads) | |
d50171e4 PA |
2062 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2063 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2064 | |
d50171e4 | 2065 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2066 | { |
2067 | if (debug_threads) | |
d50171e4 PA |
2068 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2069 | lwpid_of (lwp), wstat); | |
2070 | ||
c35fafde PA |
2071 | lwp->status_pending_p = 1; |
2072 | lwp->status_pending = wstat; | |
2073 | } | |
0d62e5e8 | 2074 | } |
d50171e4 | 2075 | else |
95954743 PA |
2076 | { |
2077 | if (debug_threads) | |
d50171e4 | 2078 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2079 | |
d50171e4 PA |
2080 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2081 | if (lwp) | |
2082 | { | |
2083 | /* Leave this status pending for the next time we're able to | |
2084 | report it. In the mean time, we'll report this lwp as | |
2085 | dead to GDB, so GDB doesn't try to read registers and | |
2086 | memory from it. This can only happen if this was the | |
2087 | last thread of the process; otherwise, PID is removed | |
2088 | from the thread tables before linux_wait_for_event | |
2089 | returns. */ | |
2090 | mark_lwp_dead (lwp, wstat); | |
2091 | } | |
95954743 | 2092 | } |
0d62e5e8 | 2093 | |
bd99dc85 | 2094 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2095 | current_inferior = saved_inferior; |
2096 | else | |
2097 | { | |
2098 | if (debug_threads) | |
2099 | fprintf (stderr, "Previously current thread died.\n"); | |
2100 | ||
bd99dc85 PA |
2101 | if (non_stop) |
2102 | { | |
2103 | /* We can't change the current inferior behind GDB's back, | |
2104 | otherwise, a subsequent command may apply to the wrong | |
2105 | process. */ | |
2106 | current_inferior = NULL; | |
2107 | } | |
2108 | else | |
2109 | { | |
2110 | /* Set a valid thread as current. */ | |
2111 | set_desired_inferior (0); | |
2112 | } | |
0d62e5e8 DJ |
2113 | } |
2114 | } | |
2115 | ||
2116 | static void | |
54a0b537 | 2117 | stop_all_lwps (void) |
0d62e5e8 DJ |
2118 | { |
2119 | stopping_threads = 1; | |
54a0b537 PA |
2120 | for_each_inferior (&all_lwps, send_sigstop); |
2121 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
2122 | stopping_threads = 0; |
2123 | } | |
2124 | ||
da6d8c04 DJ |
2125 | /* Resume execution of the inferior process. |
2126 | If STEP is nonzero, single-step it. | |
2127 | If SIGNAL is nonzero, give it that signal. */ | |
2128 | ||
ce3a066d | 2129 | static void |
2acc282a | 2130 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 2131 | int step, int signal, siginfo_t *info) |
da6d8c04 | 2132 | { |
0d62e5e8 DJ |
2133 | struct thread_info *saved_inferior; |
2134 | ||
54a0b537 | 2135 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
2136 | return; |
2137 | ||
2138 | /* If we have pending signals or status, and a new signal, enqueue the | |
2139 | signal. Also enqueue the signal if we are waiting to reinsert a | |
2140 | breakpoint; it will be picked up again below. */ | |
2141 | if (signal != 0 | |
54a0b537 PA |
2142 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
2143 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
2144 | { |
2145 | struct pending_signals *p_sig; | |
bca929d3 | 2146 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 2147 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 2148 | p_sig->signal = signal; |
32ca6d61 DJ |
2149 | if (info == NULL) |
2150 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2151 | else | |
2152 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 2153 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
2154 | } |
2155 | ||
d50171e4 PA |
2156 | if (lwp->status_pending_p) |
2157 | { | |
2158 | if (debug_threads) | |
2159 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
2160 | " has pending status\n", | |
2161 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
2162 | lwp->stop_expected ? "expected" : "not expected"); | |
2163 | return; | |
2164 | } | |
0d62e5e8 DJ |
2165 | |
2166 | saved_inferior = current_inferior; | |
54a0b537 | 2167 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
2168 | |
2169 | if (debug_threads) | |
1b3f6016 | 2170 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 2171 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 2172 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
2173 | |
2174 | /* This bit needs some thinking about. If we get a signal that | |
2175 | we must report while a single-step reinsert is still pending, | |
2176 | we often end up resuming the thread. It might be better to | |
2177 | (ew) allow a stack of pending events; then we could be sure that | |
2178 | the reinsert happened right away and not lose any signals. | |
2179 | ||
2180 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 2181 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
2182 | complete correctness, so it won't solve that problem. It may be |
2183 | worthwhile just to solve this one, however. */ | |
54a0b537 | 2184 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
2185 | { |
2186 | if (debug_threads) | |
d50171e4 PA |
2187 | fprintf (stderr, " pending reinsert at 0x%s\n", |
2188 | paddress (lwp->bp_reinsert)); | |
2189 | ||
2190 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
2191 | { | |
2192 | if (step == 0) | |
2193 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
2194 | ||
2195 | step = 1; | |
2196 | } | |
0d62e5e8 DJ |
2197 | |
2198 | /* Postpone any pending signal. It was enqueued above. */ | |
2199 | signal = 0; | |
2200 | } | |
2201 | ||
aa691b87 | 2202 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 2203 | { |
442ea881 PA |
2204 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
2205 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 2206 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
2207 | } |
2208 | ||
2209 | /* If we have pending signals, consume one unless we are trying to reinsert | |
2210 | a breakpoint. */ | |
54a0b537 | 2211 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
2212 | { |
2213 | struct pending_signals **p_sig; | |
2214 | ||
54a0b537 | 2215 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
2216 | while ((*p_sig)->prev != NULL) |
2217 | p_sig = &(*p_sig)->prev; | |
2218 | ||
2219 | signal = (*p_sig)->signal; | |
32ca6d61 | 2220 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 2221 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 2222 | |
0d62e5e8 DJ |
2223 | free (*p_sig); |
2224 | *p_sig = NULL; | |
2225 | } | |
2226 | ||
aa5ca48f DE |
2227 | if (the_low_target.prepare_to_resume != NULL) |
2228 | the_low_target.prepare_to_resume (lwp); | |
2229 | ||
0d62e5e8 | 2230 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 2231 | get_lwp_thread (lwp)); |
da6d8c04 | 2232 | errno = 0; |
54a0b537 | 2233 | lwp->stopped = 0; |
c3adc08c | 2234 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 2235 | lwp->stepping = step; |
14ce3065 DE |
2236 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
2237 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2238 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2239 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
2240 | |
2241 | current_inferior = saved_inferior; | |
da6d8c04 | 2242 | if (errno) |
3221518c UW |
2243 | { |
2244 | /* ESRCH from ptrace either means that the thread was already | |
2245 | running (an error) or that it is gone (a race condition). If | |
2246 | it's gone, we will get a notification the next time we wait, | |
2247 | so we can ignore the error. We could differentiate these | |
2248 | two, but it's tricky without waiting; the thread still exists | |
2249 | as a zombie, so sending it signal 0 would succeed. So just | |
2250 | ignore ESRCH. */ | |
2251 | if (errno == ESRCH) | |
2252 | return; | |
2253 | ||
2254 | perror_with_name ("ptrace"); | |
2255 | } | |
da6d8c04 DJ |
2256 | } |
2257 | ||
2bd7c093 PA |
2258 | struct thread_resume_array |
2259 | { | |
2260 | struct thread_resume *resume; | |
2261 | size_t n; | |
2262 | }; | |
64386c31 DJ |
2263 | |
2264 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
2265 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
2266 | resume request. | |
2267 | ||
2268 | This algorithm is O(threads * resume elements), but resume elements | |
2269 | is small (and will remain small at least until GDB supports thread | |
2270 | suspension). */ | |
2bd7c093 PA |
2271 | static int |
2272 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 2273 | { |
54a0b537 | 2274 | struct lwp_info *lwp; |
64386c31 | 2275 | struct thread_info *thread; |
5544ad89 | 2276 | int ndx; |
2bd7c093 | 2277 | struct thread_resume_array *r; |
64386c31 DJ |
2278 | |
2279 | thread = (struct thread_info *) entry; | |
54a0b537 | 2280 | lwp = get_thread_lwp (thread); |
2bd7c093 | 2281 | r = arg; |
64386c31 | 2282 | |
2bd7c093 | 2283 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
2284 | { |
2285 | ptid_t ptid = r->resume[ndx].thread; | |
2286 | if (ptid_equal (ptid, minus_one_ptid) | |
2287 | || ptid_equal (ptid, entry->id) | |
2288 | || (ptid_is_pid (ptid) | |
2289 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
2290 | || (ptid_get_lwp (ptid) == -1 | |
2291 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
2292 | { | |
d50171e4 PA |
2293 | if (r->resume[ndx].kind == resume_stop |
2294 | && lwp->last_resume_kind == resume_stop) | |
2295 | { | |
2296 | if (debug_threads) | |
2297 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
2298 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
2299 | ? "stopped" | |
2300 | : "stopping", | |
2301 | lwpid_of (lwp)); | |
2302 | ||
2303 | continue; | |
2304 | } | |
2305 | ||
95954743 | 2306 | lwp->resume = &r->resume[ndx]; |
d50171e4 | 2307 | lwp->last_resume_kind = lwp->resume->kind; |
95954743 PA |
2308 | return 0; |
2309 | } | |
2310 | } | |
2bd7c093 PA |
2311 | |
2312 | /* No resume action for this thread. */ | |
2313 | lwp->resume = NULL; | |
64386c31 | 2314 | |
2bd7c093 | 2315 | return 0; |
5544ad89 DJ |
2316 | } |
2317 | ||
5544ad89 | 2318 | |
bd99dc85 PA |
2319 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
2320 | static int | |
2321 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 2322 | { |
bd99dc85 | 2323 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 2324 | |
bd99dc85 PA |
2325 | /* LWPs which will not be resumed are not interesting, because |
2326 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 2327 | if (lwp->resume == NULL) |
bd99dc85 | 2328 | return 0; |
64386c31 | 2329 | |
bd99dc85 | 2330 | if (lwp->status_pending_p) |
d50171e4 PA |
2331 | * (int *) flag_p = 1; |
2332 | ||
2333 | return 0; | |
2334 | } | |
2335 | ||
2336 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
2337 | internal breakpoint that we need to step over. It assumes that any | |
2338 | required STOP_PC adjustment has already been propagated to the | |
2339 | inferior's regcache. */ | |
2340 | ||
2341 | static int | |
2342 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
2343 | { | |
2344 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2345 | struct thread_info *saved_inferior; | |
2346 | CORE_ADDR pc; | |
2347 | ||
2348 | /* LWPs which will not be resumed are not interesting, because we | |
2349 | might not wait for them next time through linux_wait. */ | |
2350 | ||
2351 | if (!lwp->stopped) | |
2352 | { | |
2353 | if (debug_threads) | |
2354 | fprintf (stderr, | |
2355 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
2356 | lwpid_of (lwp)); | |
2357 | return 0; | |
2358 | } | |
2359 | ||
2360 | if (lwp->last_resume_kind == resume_stop) | |
2361 | { | |
2362 | if (debug_threads) | |
2363 | fprintf (stderr, | |
2364 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
2365 | lwpid_of (lwp)); | |
2366 | return 0; | |
2367 | } | |
2368 | ||
2369 | if (!lwp->need_step_over) | |
2370 | { | |
2371 | if (debug_threads) | |
2372 | fprintf (stderr, | |
2373 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
2374 | } | |
5544ad89 | 2375 | |
bd99dc85 | 2376 | if (lwp->status_pending_p) |
d50171e4 PA |
2377 | { |
2378 | if (debug_threads) | |
2379 | fprintf (stderr, | |
2380 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
2381 | lwpid_of (lwp)); | |
2382 | return 0; | |
2383 | } | |
2384 | ||
2385 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
2386 | or we have. */ | |
2387 | pc = get_pc (lwp); | |
2388 | ||
2389 | /* If the PC has changed since we stopped, then don't do anything, | |
2390 | and let the breakpoint/tracepoint be hit. This happens if, for | |
2391 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
2392 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
2393 | command, or poked thread's registers herself. */ | |
2394 | if (pc != lwp->stop_pc) | |
2395 | { | |
2396 | if (debug_threads) | |
2397 | fprintf (stderr, | |
2398 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
2399 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
2400 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
2401 | ||
2402 | lwp->need_step_over = 0; | |
2403 | return 0; | |
2404 | } | |
2405 | ||
2406 | saved_inferior = current_inferior; | |
2407 | current_inferior = get_lwp_thread (lwp); | |
2408 | ||
8b07ae33 | 2409 | /* We can only step over breakpoints we know about. */ |
d50171e4 PA |
2410 | if (breakpoint_here (pc)) |
2411 | { | |
8b07ae33 PA |
2412 | /* Don't step over a breakpoint that GDB expects to hit |
2413 | though. */ | |
2414 | if (gdb_breakpoint_here (pc)) | |
2415 | { | |
2416 | if (debug_threads) | |
2417 | fprintf (stderr, | |
2418 | "Need step over [LWP %ld]? yes, but found" | |
2419 | " GDB breakpoint at 0x%s; skipping step over\n", | |
2420 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 2421 | |
8b07ae33 PA |
2422 | current_inferior = saved_inferior; |
2423 | return 0; | |
2424 | } | |
2425 | else | |
2426 | { | |
2427 | if (debug_threads) | |
2428 | fprintf (stderr, | |
2429 | "Need step over [LWP %ld]? yes, found breakpoint at 0x%s\n", | |
2430 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 2431 | |
8b07ae33 PA |
2432 | /* We've found an lwp that needs stepping over --- return 1 so |
2433 | that find_inferior stops looking. */ | |
2434 | current_inferior = saved_inferior; | |
2435 | ||
2436 | /* If the step over is cancelled, this is set again. */ | |
2437 | lwp->need_step_over = 0; | |
2438 | return 1; | |
2439 | } | |
d50171e4 PA |
2440 | } |
2441 | ||
2442 | current_inferior = saved_inferior; | |
2443 | ||
2444 | if (debug_threads) | |
2445 | fprintf (stderr, | |
2446 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
2447 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 2448 | |
bd99dc85 | 2449 | return 0; |
5544ad89 DJ |
2450 | } |
2451 | ||
d50171e4 PA |
2452 | /* Start a step-over operation on LWP. When LWP stopped at a |
2453 | breakpoint, to make progress, we need to remove the breakpoint out | |
2454 | of the way. If we let other threads run while we do that, they may | |
2455 | pass by the breakpoint location and miss hitting it. To avoid | |
2456 | that, a step-over momentarily stops all threads while LWP is | |
2457 | single-stepped while the breakpoint is temporarily uninserted from | |
2458 | the inferior. When the single-step finishes, we reinsert the | |
2459 | breakpoint, and let all threads that are supposed to be running, | |
2460 | run again. | |
2461 | ||
2462 | On targets that don't support hardware single-step, we don't | |
2463 | currently support full software single-stepping. Instead, we only | |
2464 | support stepping over the thread event breakpoint, by asking the | |
2465 | low target where to place a reinsert breakpoint. Since this | |
2466 | routine assumes the breakpoint being stepped over is a thread event | |
2467 | breakpoint, it usually assumes the return address of the current | |
2468 | function is a good enough place to set the reinsert breakpoint. */ | |
2469 | ||
2470 | static int | |
2471 | start_step_over (struct lwp_info *lwp) | |
2472 | { | |
2473 | struct thread_info *saved_inferior; | |
2474 | CORE_ADDR pc; | |
2475 | int step; | |
2476 | ||
2477 | if (debug_threads) | |
2478 | fprintf (stderr, | |
2479 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
2480 | lwpid_of (lwp)); | |
2481 | ||
2482 | stop_all_lwps (); | |
2483 | ||
2484 | if (debug_threads) | |
2485 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
2486 | ||
2487 | /* Note, we should always reach here with an already adjusted PC, | |
2488 | either by GDB (if we're resuming due to GDB's request), or by our | |
2489 | caller, if we just finished handling an internal breakpoint GDB | |
2490 | shouldn't care about. */ | |
2491 | pc = get_pc (lwp); | |
2492 | ||
2493 | saved_inferior = current_inferior; | |
2494 | current_inferior = get_lwp_thread (lwp); | |
2495 | ||
2496 | lwp->bp_reinsert = pc; | |
2497 | uninsert_breakpoints_at (pc); | |
2498 | ||
2499 | if (can_hardware_single_step ()) | |
2500 | { | |
2501 | step = 1; | |
2502 | } | |
2503 | else | |
2504 | { | |
2505 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
2506 | set_reinsert_breakpoint (raddr); | |
2507 | step = 0; | |
2508 | } | |
2509 | ||
2510 | current_inferior = saved_inferior; | |
2511 | ||
2512 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
2513 | ||
2514 | /* Require next event from this LWP. */ | |
2515 | step_over_bkpt = lwp->head.id; | |
2516 | return 1; | |
2517 | } | |
2518 | ||
2519 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
2520 | start_step_over, if still there, and delete any reinsert | |
2521 | breakpoints we've set, on non hardware single-step targets. */ | |
2522 | ||
2523 | static int | |
2524 | finish_step_over (struct lwp_info *lwp) | |
2525 | { | |
2526 | if (lwp->bp_reinsert != 0) | |
2527 | { | |
2528 | if (debug_threads) | |
2529 | fprintf (stderr, "Finished step over.\n"); | |
2530 | ||
2531 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
2532 | may be no breakpoint to reinsert there by now. */ | |
2533 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
2534 | ||
2535 | lwp->bp_reinsert = 0; | |
2536 | ||
2537 | /* Delete any software-single-step reinsert breakpoints. No | |
2538 | longer needed. We don't have to worry about other threads | |
2539 | hitting this trap, and later not being able to explain it, | |
2540 | because we were stepping over a breakpoint, and we hold all | |
2541 | threads but LWP stopped while doing that. */ | |
2542 | if (!can_hardware_single_step ()) | |
2543 | delete_reinsert_breakpoints (); | |
2544 | ||
2545 | step_over_bkpt = null_ptid; | |
2546 | return 1; | |
2547 | } | |
2548 | else | |
2549 | return 0; | |
2550 | } | |
2551 | ||
5544ad89 DJ |
2552 | /* This function is called once per thread. We check the thread's resume |
2553 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 2554 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 2555 | |
bd99dc85 PA |
2556 | For threads which we aren't explicitly told otherwise, we preserve |
2557 | the stepping flag; this is used for stepping over gdbserver-placed | |
2558 | breakpoints. | |
2559 | ||
2560 | If pending_flags was set in any thread, we queue any needed | |
2561 | signals, since we won't actually resume. We already have a pending | |
2562 | event to report, so we don't need to preserve any step requests; | |
2563 | they should be re-issued if necessary. */ | |
2564 | ||
2565 | static int | |
2566 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 2567 | { |
54a0b537 | 2568 | struct lwp_info *lwp; |
5544ad89 | 2569 | struct thread_info *thread; |
bd99dc85 | 2570 | int step; |
d50171e4 PA |
2571 | int leave_all_stopped = * (int *) arg; |
2572 | int leave_pending; | |
5544ad89 DJ |
2573 | |
2574 | thread = (struct thread_info *) entry; | |
54a0b537 | 2575 | lwp = get_thread_lwp (thread); |
5544ad89 | 2576 | |
2bd7c093 | 2577 | if (lwp->resume == NULL) |
bd99dc85 | 2578 | return 0; |
5544ad89 | 2579 | |
bd99dc85 | 2580 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 2581 | { |
bd99dc85 | 2582 | if (debug_threads) |
d50171e4 | 2583 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
2584 | |
2585 | if (!lwp->stopped) | |
2586 | { | |
2587 | if (debug_threads) | |
d50171e4 | 2588 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 2589 | |
d50171e4 PA |
2590 | /* Stop the thread, and wait for the event asynchronously, |
2591 | through the event loop. */ | |
bd99dc85 PA |
2592 | send_sigstop (&lwp->head); |
2593 | } | |
2594 | else | |
2595 | { | |
2596 | if (debug_threads) | |
d50171e4 PA |
2597 | fprintf (stderr, "already stopped LWP %ld\n", |
2598 | lwpid_of (lwp)); | |
2599 | ||
2600 | /* The LWP may have been stopped in an internal event that | |
2601 | was not meant to be notified back to GDB (e.g., gdbserver | |
2602 | breakpoint), so we should be reporting a stop event in | |
2603 | this case too. */ | |
2604 | ||
2605 | /* If the thread already has a pending SIGSTOP, this is a | |
2606 | no-op. Otherwise, something later will presumably resume | |
2607 | the thread and this will cause it to cancel any pending | |
2608 | operation, due to last_resume_kind == resume_stop. If | |
2609 | the thread already has a pending status to report, we | |
2610 | will still report it the next time we wait - see | |
2611 | status_pending_p_callback. */ | |
2612 | send_sigstop (&lwp->head); | |
bd99dc85 | 2613 | } |
32ca6d61 | 2614 | |
bd99dc85 PA |
2615 | /* For stop requests, we're done. */ |
2616 | lwp->resume = NULL; | |
fc7238bb | 2617 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 2618 | return 0; |
5544ad89 DJ |
2619 | } |
2620 | ||
bd99dc85 PA |
2621 | /* If this thread which is about to be resumed has a pending status, |
2622 | then don't resume any threads - we can just report the pending | |
2623 | status. Make sure to queue any signals that would otherwise be | |
2624 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
2625 | thread has a pending status. If there's a thread that needs the |
2626 | step-over-breakpoint dance, then don't resume any other thread | |
2627 | but that particular one. */ | |
2628 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 2629 | |
d50171e4 | 2630 | if (!leave_pending) |
bd99dc85 PA |
2631 | { |
2632 | if (debug_threads) | |
2633 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 2634 | |
d50171e4 | 2635 | step = (lwp->resume->kind == resume_step); |
2acc282a | 2636 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
2637 | } |
2638 | else | |
2639 | { | |
2640 | if (debug_threads) | |
2641 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 2642 | |
bd99dc85 PA |
2643 | /* If we have a new signal, enqueue the signal. */ |
2644 | if (lwp->resume->sig != 0) | |
2645 | { | |
2646 | struct pending_signals *p_sig; | |
2647 | p_sig = xmalloc (sizeof (*p_sig)); | |
2648 | p_sig->prev = lwp->pending_signals; | |
2649 | p_sig->signal = lwp->resume->sig; | |
2650 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2651 | ||
2652 | /* If this is the same signal we were previously stopped by, | |
2653 | make sure to queue its siginfo. We can ignore the return | |
2654 | value of ptrace; if it fails, we'll skip | |
2655 | PTRACE_SETSIGINFO. */ | |
2656 | if (WIFSTOPPED (lwp->last_status) | |
2657 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
2658 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
2659 | ||
2660 | lwp->pending_signals = p_sig; | |
2661 | } | |
2662 | } | |
5544ad89 | 2663 | |
fc7238bb | 2664 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 2665 | lwp->resume = NULL; |
5544ad89 | 2666 | return 0; |
0d62e5e8 DJ |
2667 | } |
2668 | ||
2669 | static void | |
2bd7c093 | 2670 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 2671 | { |
2bd7c093 | 2672 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
2673 | struct lwp_info *need_step_over = NULL; |
2674 | int any_pending; | |
2675 | int leave_all_stopped; | |
c6ecbae5 | 2676 | |
2bd7c093 | 2677 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 2678 | |
d50171e4 PA |
2679 | /* If there is a thread which would otherwise be resumed, which has |
2680 | a pending status, then don't resume any threads - we can just | |
2681 | report the pending status. Make sure to queue any signals that | |
2682 | would otherwise be sent. In non-stop mode, we'll apply this | |
2683 | logic to each thread individually. We consume all pending events | |
2684 | before considering to start a step-over (in all-stop). */ | |
2685 | any_pending = 0; | |
bd99dc85 | 2686 | if (!non_stop) |
d50171e4 PA |
2687 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
2688 | ||
2689 | /* If there is a thread which would otherwise be resumed, which is | |
2690 | stopped at a breakpoint that needs stepping over, then don't | |
2691 | resume any threads - have it step over the breakpoint with all | |
2692 | other threads stopped, then resume all threads again. Make sure | |
2693 | to queue any signals that would otherwise be delivered or | |
2694 | queued. */ | |
2695 | if (!any_pending && supports_breakpoints ()) | |
2696 | need_step_over | |
2697 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2698 | need_step_over_p, NULL); | |
2699 | ||
2700 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
2701 | ||
2702 | if (debug_threads) | |
2703 | { | |
2704 | if (need_step_over != NULL) | |
2705 | fprintf (stderr, "Not resuming all, need step over\n"); | |
2706 | else if (any_pending) | |
2707 | fprintf (stderr, | |
2708 | "Not resuming, all-stop and found " | |
2709 | "an LWP with pending status\n"); | |
2710 | else | |
2711 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
2712 | } | |
2713 | ||
2714 | /* Even if we're leaving threads stopped, queue all signals we'd | |
2715 | otherwise deliver. */ | |
2716 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
2717 | ||
2718 | if (need_step_over) | |
2719 | start_step_over (need_step_over); | |
2720 | } | |
2721 | ||
2722 | /* This function is called once per thread. We check the thread's | |
2723 | last resume request, which will tell us whether to resume, step, or | |
2724 | leave the thread stopped. Any signal the client requested to be | |
2725 | delivered has already been enqueued at this point. | |
2726 | ||
2727 | If any thread that GDB wants running is stopped at an internal | |
2728 | breakpoint that needs stepping over, we start a step-over operation | |
2729 | on that particular thread, and leave all others stopped. */ | |
2730 | ||
2731 | static void | |
2732 | proceed_one_lwp (struct inferior_list_entry *entry) | |
2733 | { | |
2734 | struct lwp_info *lwp; | |
2735 | int step; | |
2736 | ||
2737 | lwp = (struct lwp_info *) entry; | |
2738 | ||
2739 | if (debug_threads) | |
2740 | fprintf (stderr, | |
2741 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
2742 | ||
2743 | if (!lwp->stopped) | |
2744 | { | |
2745 | if (debug_threads) | |
2746 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
2747 | return; | |
2748 | } | |
2749 | ||
2750 | if (lwp->last_resume_kind == resume_stop) | |
2751 | { | |
2752 | if (debug_threads) | |
2753 | fprintf (stderr, " client wants LWP %ld stopped\n", lwpid_of (lwp)); | |
2754 | return; | |
2755 | } | |
2756 | ||
2757 | if (lwp->status_pending_p) | |
2758 | { | |
2759 | if (debug_threads) | |
2760 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
2761 | lwpid_of (lwp)); | |
2762 | return; | |
2763 | } | |
2764 | ||
2765 | if (lwp->suspended) | |
2766 | { | |
2767 | if (debug_threads) | |
2768 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
2769 | return; | |
2770 | } | |
2771 | ||
2772 | step = lwp->last_resume_kind == resume_step; | |
2773 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
2774 | } | |
2775 | ||
2776 | /* When we finish a step-over, set threads running again. If there's | |
2777 | another thread that may need a step-over, now's the time to start | |
2778 | it. Eventually, we'll move all threads past their breakpoints. */ | |
2779 | ||
2780 | static void | |
2781 | proceed_all_lwps (void) | |
2782 | { | |
2783 | struct lwp_info *need_step_over; | |
2784 | ||
2785 | /* If there is a thread which would otherwise be resumed, which is | |
2786 | stopped at a breakpoint that needs stepping over, then don't | |
2787 | resume any threads - have it step over the breakpoint with all | |
2788 | other threads stopped, then resume all threads again. */ | |
2789 | ||
2790 | if (supports_breakpoints ()) | |
2791 | { | |
2792 | need_step_over | |
2793 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2794 | need_step_over_p, NULL); | |
2795 | ||
2796 | if (need_step_over != NULL) | |
2797 | { | |
2798 | if (debug_threads) | |
2799 | fprintf (stderr, "proceed_all_lwps: found " | |
2800 | "thread %ld needing a step-over\n", | |
2801 | lwpid_of (need_step_over)); | |
2802 | ||
2803 | start_step_over (need_step_over); | |
2804 | return; | |
2805 | } | |
2806 | } | |
5544ad89 | 2807 | |
d50171e4 PA |
2808 | if (debug_threads) |
2809 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
2810 | ||
2811 | for_each_inferior (&all_lwps, proceed_one_lwp); | |
2812 | } | |
2813 | ||
2814 | /* Stopped LWPs that the client wanted to be running, that don't have | |
2815 | pending statuses, are set to run again, except for EXCEPT, if not | |
2816 | NULL. This undoes a stop_all_lwps call. */ | |
2817 | ||
2818 | static void | |
2819 | unstop_all_lwps (struct lwp_info *except) | |
2820 | { | |
5544ad89 DJ |
2821 | if (debug_threads) |
2822 | { | |
d50171e4 PA |
2823 | if (except) |
2824 | fprintf (stderr, | |
2825 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 2826 | else |
d50171e4 PA |
2827 | fprintf (stderr, |
2828 | "unstopping all lwps\n"); | |
5544ad89 DJ |
2829 | } |
2830 | ||
d50171e4 PA |
2831 | /* Make sure proceed_one_lwp doesn't try to resume this thread. */ |
2832 | if (except != NULL) | |
2833 | ++except->suspended; | |
2834 | ||
2835 | for_each_inferior (&all_lwps, proceed_one_lwp); | |
2836 | ||
2837 | if (except != NULL) | |
2838 | --except->suspended; | |
0d62e5e8 DJ |
2839 | } |
2840 | ||
2841 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
2842 | |
2843 | int | |
0a30fbc4 | 2844 | register_addr (int regnum) |
da6d8c04 DJ |
2845 | { |
2846 | int addr; | |
2847 | ||
2ec06d2e | 2848 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
2849 | error ("Invalid register number %d.", regnum); |
2850 | ||
2ec06d2e | 2851 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2852 | |
2853 | return addr; | |
2854 | } | |
2855 | ||
58caa3dc | 2856 | /* Fetch one register. */ |
da6d8c04 | 2857 | static void |
442ea881 | 2858 | fetch_register (struct regcache *regcache, int regno) |
da6d8c04 DJ |
2859 | { |
2860 | CORE_ADDR regaddr; | |
48d93c75 | 2861 | int i, size; |
0d62e5e8 | 2862 | char *buf; |
95954743 | 2863 | int pid; |
da6d8c04 | 2864 | |
2ec06d2e | 2865 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2866 | return; |
2ec06d2e | 2867 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2868 | return; |
da6d8c04 | 2869 | |
0a30fbc4 DJ |
2870 | regaddr = register_addr (regno); |
2871 | if (regaddr == -1) | |
2872 | return; | |
95954743 PA |
2873 | |
2874 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2875 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2876 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2877 | buf = alloca (size); |
2878 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2879 | { |
2880 | errno = 0; | |
0d62e5e8 | 2881 | *(PTRACE_XFER_TYPE *) (buf + i) = |
14ce3065 DE |
2882 | ptrace (PTRACE_PEEKUSER, pid, |
2883 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2884 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2885 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
da6d8c04 DJ |
2886 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2887 | if (errno != 0) | |
f52cd8cd | 2888 | error ("reading register %d: %s", regno, strerror (errno)); |
da6d8c04 | 2889 | } |
ee1a7ae4 UW |
2890 | |
2891 | if (the_low_target.supply_ptrace_register) | |
442ea881 | 2892 | the_low_target.supply_ptrace_register (regcache, regno, buf); |
5a1f5858 | 2893 | else |
442ea881 | 2894 | supply_register (regcache, regno, buf); |
da6d8c04 DJ |
2895 | } |
2896 | ||
2897 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc | 2898 | static void |
442ea881 | 2899 | usr_fetch_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 2900 | { |
4463ce24 | 2901 | if (regno == -1) |
2ec06d2e | 2902 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 2903 | fetch_register (regcache, regno); |
da6d8c04 | 2904 | else |
442ea881 | 2905 | fetch_register (regcache, regno); |
da6d8c04 DJ |
2906 | } |
2907 | ||
2908 | /* Store our register values back into the inferior. | |
2909 | If REGNO is -1, do this for all registers. | |
2910 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc | 2911 | static void |
442ea881 | 2912 | usr_store_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 DJ |
2913 | { |
2914 | CORE_ADDR regaddr; | |
48d93c75 | 2915 | int i, size; |
0d62e5e8 | 2916 | char *buf; |
55ac2b99 | 2917 | int pid; |
da6d8c04 DJ |
2918 | |
2919 | if (regno >= 0) | |
2920 | { | |
2ec06d2e | 2921 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2922 | return; |
2923 | ||
bc1e36ca | 2924 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2925 | return; |
2926 | ||
2927 | regaddr = register_addr (regno); | |
2928 | if (regaddr == -1) | |
da6d8c04 | 2929 | return; |
da6d8c04 | 2930 | errno = 0; |
48d93c75 UW |
2931 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2932 | & - sizeof (PTRACE_XFER_TYPE); | |
2933 | buf = alloca (size); | |
2934 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2935 | |
2936 | if (the_low_target.collect_ptrace_register) | |
442ea881 | 2937 | the_low_target.collect_ptrace_register (regcache, regno, buf); |
5a1f5858 | 2938 | else |
442ea881 | 2939 | collect_register (regcache, regno, buf); |
ee1a7ae4 | 2940 | |
95954743 | 2941 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2942 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2943 | { |
0a30fbc4 | 2944 | errno = 0; |
14ce3065 DE |
2945 | ptrace (PTRACE_POKEUSER, pid, |
2946 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2947 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
2948 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
2949 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
da6d8c04 DJ |
2950 | if (errno != 0) |
2951 | { | |
1b3f6016 PA |
2952 | /* At this point, ESRCH should mean the process is |
2953 | already gone, in which case we simply ignore attempts | |
2954 | to change its registers. See also the related | |
2955 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2956 | if (errno == ESRCH) |
2957 | return; | |
2958 | ||
bc1e36ca | 2959 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
f52cd8cd | 2960 | error ("writing register %d: %s", regno, strerror (errno)); |
da6d8c04 | 2961 | } |
2ff29de4 | 2962 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2963 | } |
da6d8c04 DJ |
2964 | } |
2965 | else | |
2ec06d2e | 2966 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 2967 | usr_store_inferior_registers (regcache, regno); |
da6d8c04 | 2968 | } |
58caa3dc DJ |
2969 | #endif /* HAVE_LINUX_USRREGS */ |
2970 | ||
2971 | ||
2972 | ||
2973 | #ifdef HAVE_LINUX_REGSETS | |
2974 | ||
2975 | static int | |
442ea881 | 2976 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
2977 | { |
2978 | struct regset_info *regset; | |
e9d25b98 | 2979 | int saw_general_regs = 0; |
95954743 | 2980 | int pid; |
1570b33e | 2981 | struct iovec iov; |
58caa3dc DJ |
2982 | |
2983 | regset = target_regsets; | |
2984 | ||
95954743 | 2985 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2986 | while (regset->size >= 0) |
2987 | { | |
1570b33e L |
2988 | void *buf, *data; |
2989 | int nt_type, res; | |
58caa3dc | 2990 | |
52fa2412 | 2991 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2992 | { |
2993 | regset ++; | |
2994 | continue; | |
2995 | } | |
2996 | ||
bca929d3 | 2997 | buf = xmalloc (regset->size); |
1570b33e L |
2998 | |
2999 | nt_type = regset->nt_type; | |
3000 | if (nt_type) | |
3001 | { | |
3002 | iov.iov_base = buf; | |
3003 | iov.iov_len = regset->size; | |
3004 | data = (void *) &iov; | |
3005 | } | |
3006 | else | |
3007 | data = buf; | |
3008 | ||
dfb64f85 | 3009 | #ifndef __sparc__ |
1570b33e | 3010 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3011 | #else |
1570b33e | 3012 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 3013 | #endif |
58caa3dc DJ |
3014 | if (res < 0) |
3015 | { | |
3016 | if (errno == EIO) | |
3017 | { | |
52fa2412 UW |
3018 | /* If we get EIO on a regset, do not try it again for |
3019 | this process. */ | |
3020 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3021 | free (buf); |
52fa2412 | 3022 | continue; |
58caa3dc DJ |
3023 | } |
3024 | else | |
3025 | { | |
0d62e5e8 | 3026 | char s[256]; |
95954743 PA |
3027 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
3028 | pid); | |
0d62e5e8 | 3029 | perror (s); |
58caa3dc DJ |
3030 | } |
3031 | } | |
e9d25b98 DJ |
3032 | else if (regset->type == GENERAL_REGS) |
3033 | saw_general_regs = 1; | |
442ea881 | 3034 | regset->store_function (regcache, buf); |
58caa3dc | 3035 | regset ++; |
fdeb2a12 | 3036 | free (buf); |
58caa3dc | 3037 | } |
e9d25b98 DJ |
3038 | if (saw_general_regs) |
3039 | return 0; | |
3040 | else | |
3041 | return 1; | |
58caa3dc DJ |
3042 | } |
3043 | ||
3044 | static int | |
442ea881 | 3045 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3046 | { |
3047 | struct regset_info *regset; | |
e9d25b98 | 3048 | int saw_general_regs = 0; |
95954743 | 3049 | int pid; |
1570b33e | 3050 | struct iovec iov; |
58caa3dc DJ |
3051 | |
3052 | regset = target_regsets; | |
3053 | ||
95954743 | 3054 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3055 | while (regset->size >= 0) |
3056 | { | |
1570b33e L |
3057 | void *buf, *data; |
3058 | int nt_type, res; | |
58caa3dc | 3059 | |
52fa2412 | 3060 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3061 | { |
3062 | regset ++; | |
3063 | continue; | |
3064 | } | |
3065 | ||
bca929d3 | 3066 | buf = xmalloc (regset->size); |
545587ee DJ |
3067 | |
3068 | /* First fill the buffer with the current register set contents, | |
3069 | in case there are any items in the kernel's regset that are | |
3070 | not in gdbserver's regcache. */ | |
1570b33e L |
3071 | |
3072 | nt_type = regset->nt_type; | |
3073 | if (nt_type) | |
3074 | { | |
3075 | iov.iov_base = buf; | |
3076 | iov.iov_len = regset->size; | |
3077 | data = (void *) &iov; | |
3078 | } | |
3079 | else | |
3080 | data = buf; | |
3081 | ||
dfb64f85 | 3082 | #ifndef __sparc__ |
1570b33e | 3083 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3084 | #else |
1570b33e | 3085 | res = ptrace (regset->get_request, pid, &iov, data); |
dfb64f85 | 3086 | #endif |
545587ee DJ |
3087 | |
3088 | if (res == 0) | |
3089 | { | |
3090 | /* Then overlay our cached registers on that. */ | |
442ea881 | 3091 | regset->fill_function (regcache, buf); |
545587ee DJ |
3092 | |
3093 | /* Only now do we write the register set. */ | |
dfb64f85 | 3094 | #ifndef __sparc__ |
1570b33e | 3095 | res = ptrace (regset->set_request, pid, nt_type, data); |
dfb64f85 | 3096 | #else |
1570b33e | 3097 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 3098 | #endif |
545587ee DJ |
3099 | } |
3100 | ||
58caa3dc DJ |
3101 | if (res < 0) |
3102 | { | |
3103 | if (errno == EIO) | |
3104 | { | |
52fa2412 UW |
3105 | /* If we get EIO on a regset, do not try it again for |
3106 | this process. */ | |
3107 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3108 | free (buf); |
52fa2412 | 3109 | continue; |
58caa3dc | 3110 | } |
3221518c UW |
3111 | else if (errno == ESRCH) |
3112 | { | |
1b3f6016 PA |
3113 | /* At this point, ESRCH should mean the process is |
3114 | already gone, in which case we simply ignore attempts | |
3115 | to change its registers. See also the related | |
3116 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 3117 | free (buf); |
3221518c UW |
3118 | return 0; |
3119 | } | |
58caa3dc DJ |
3120 | else |
3121 | { | |
ce3a066d | 3122 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
3123 | } |
3124 | } | |
e9d25b98 DJ |
3125 | else if (regset->type == GENERAL_REGS) |
3126 | saw_general_regs = 1; | |
58caa3dc | 3127 | regset ++; |
09ec9b38 | 3128 | free (buf); |
58caa3dc | 3129 | } |
e9d25b98 DJ |
3130 | if (saw_general_regs) |
3131 | return 0; | |
3132 | else | |
3133 | return 1; | |
ce3a066d | 3134 | return 0; |
58caa3dc DJ |
3135 | } |
3136 | ||
3137 | #endif /* HAVE_LINUX_REGSETS */ | |
3138 | ||
3139 | ||
3140 | void | |
442ea881 | 3141 | linux_fetch_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3142 | { |
3143 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3144 | if (regsets_fetch_inferior_registers (regcache) == 0) |
52fa2412 | 3145 | return; |
58caa3dc DJ |
3146 | #endif |
3147 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3148 | usr_fetch_inferior_registers (regcache, regno); |
58caa3dc DJ |
3149 | #endif |
3150 | } | |
3151 | ||
3152 | void | |
442ea881 | 3153 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3154 | { |
3155 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3156 | if (regsets_store_inferior_registers (regcache) == 0) |
52fa2412 | 3157 | return; |
58caa3dc DJ |
3158 | #endif |
3159 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3160 | usr_store_inferior_registers (regcache, regno); |
58caa3dc DJ |
3161 | #endif |
3162 | } | |
3163 | ||
da6d8c04 | 3164 | |
da6d8c04 DJ |
3165 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
3166 | to debugger memory starting at MYADDR. */ | |
3167 | ||
c3e735a6 | 3168 | static int |
f450004a | 3169 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
3170 | { |
3171 | register int i; | |
3172 | /* Round starting address down to longword boundary. */ | |
3173 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
3174 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
3175 | register int count |
3176 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
3177 | / sizeof (PTRACE_XFER_TYPE); |
3178 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 3179 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 3180 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
3181 | int fd; |
3182 | char filename[64]; | |
95954743 | 3183 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
3184 | |
3185 | /* Try using /proc. Don't bother for one word. */ | |
3186 | if (len >= 3 * sizeof (long)) | |
3187 | { | |
3188 | /* We could keep this file open and cache it - possibly one per | |
3189 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 3190 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
3191 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
3192 | if (fd == -1) | |
3193 | goto no_proc; | |
3194 | ||
3195 | /* If pread64 is available, use it. It's faster if the kernel | |
3196 | supports it (only one syscall), and it's 64-bit safe even on | |
3197 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
3198 | application). */ | |
3199 | #ifdef HAVE_PREAD64 | |
3200 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
3201 | #else | |
1de1badb | 3202 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
3203 | #endif |
3204 | { | |
3205 | close (fd); | |
3206 | goto no_proc; | |
3207 | } | |
3208 | ||
3209 | close (fd); | |
3210 | return 0; | |
3211 | } | |
da6d8c04 | 3212 | |
fd462a61 | 3213 | no_proc: |
da6d8c04 DJ |
3214 | /* Read all the longwords */ |
3215 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
3216 | { | |
c3e735a6 | 3217 | errno = 0; |
14ce3065 DE |
3218 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
3219 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3220 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
3221 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
3222 | if (errno) |
3223 | return errno; | |
da6d8c04 DJ |
3224 | } |
3225 | ||
3226 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
3227 | memcpy (myaddr, |
3228 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
3229 | len); | |
c3e735a6 DJ |
3230 | |
3231 | return 0; | |
da6d8c04 DJ |
3232 | } |
3233 | ||
93ae6fdc PA |
3234 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
3235 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
3236 | returns the value of errno. */ |
3237 | ||
ce3a066d | 3238 | static int |
f450004a | 3239 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
3240 | { |
3241 | register int i; | |
3242 | /* Round starting address down to longword boundary. */ | |
3243 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
3244 | /* Round ending address up; get number of longwords that makes. */ | |
3245 | register int count | |
3246 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
3247 | /* Allocate buffer of that many longwords. */ | |
3248 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 3249 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 3250 | |
0d62e5e8 DJ |
3251 | if (debug_threads) |
3252 | { | |
58d6951d DJ |
3253 | /* Dump up to four bytes. */ |
3254 | unsigned int val = * (unsigned int *) myaddr; | |
3255 | if (len == 1) | |
3256 | val = val & 0xff; | |
3257 | else if (len == 2) | |
3258 | val = val & 0xffff; | |
3259 | else if (len == 3) | |
3260 | val = val & 0xffffff; | |
3261 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
3262 | val, (long)memaddr); | |
0d62e5e8 DJ |
3263 | } |
3264 | ||
da6d8c04 DJ |
3265 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
3266 | ||
93ae6fdc | 3267 | errno = 0; |
14ce3065 DE |
3268 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
3269 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3270 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
3271 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
3272 | if (errno) |
3273 | return errno; | |
da6d8c04 DJ |
3274 | |
3275 | if (count > 1) | |
3276 | { | |
93ae6fdc | 3277 | errno = 0; |
da6d8c04 | 3278 | buffer[count - 1] |
95954743 | 3279 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
3280 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3281 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3282 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
3283 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 3284 | 0); |
93ae6fdc PA |
3285 | if (errno) |
3286 | return errno; | |
da6d8c04 DJ |
3287 | } |
3288 | ||
93ae6fdc | 3289 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 DJ |
3290 | |
3291 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
3292 | ||
3293 | /* Write the entire buffer. */ | |
3294 | ||
3295 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
3296 | { | |
3297 | errno = 0; | |
14ce3065 DE |
3298 | ptrace (PTRACE_POKETEXT, pid, |
3299 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3300 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3301 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
3302 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
3303 | if (errno) |
3304 | return errno; | |
3305 | } | |
3306 | ||
3307 | return 0; | |
3308 | } | |
2f2893d9 | 3309 | |
6076632b | 3310 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
3311 | static int linux_supports_tracefork_flag; |
3312 | ||
51c2684e | 3313 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 3314 | |
51c2684e DJ |
3315 | static int |
3316 | linux_tracefork_grandchild (void *arg) | |
3317 | { | |
3318 | _exit (0); | |
3319 | } | |
3320 | ||
7407e2de AS |
3321 | #define STACK_SIZE 4096 |
3322 | ||
51c2684e DJ |
3323 | static int |
3324 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
3325 | { |
3326 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
3327 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
3328 | |
3329 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
3330 | ||
3331 | if (fork () == 0) | |
3332 | linux_tracefork_grandchild (NULL); | |
3333 | ||
3334 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3335 | ||
7407e2de AS |
3336 | #ifdef __ia64__ |
3337 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
3338 | CLONE_VM | SIGCHLD, NULL); | |
3339 | #else | |
3340 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
3341 | CLONE_VM | SIGCHLD, NULL); | |
3342 | #endif | |
e4b7f41c JK |
3343 | |
3344 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3345 | ||
24a09b5f DJ |
3346 | _exit (0); |
3347 | } | |
3348 | ||
24a09b5f DJ |
3349 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
3350 | sure that we can enable the option, and that it had the desired | |
3351 | effect. */ | |
3352 | ||
3353 | static void | |
3354 | linux_test_for_tracefork (void) | |
3355 | { | |
3356 | int child_pid, ret, status; | |
3357 | long second_pid; | |
e4b7f41c | 3358 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 3359 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 3360 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
3361 | |
3362 | linux_supports_tracefork_flag = 0; | |
3363 | ||
e4b7f41c JK |
3364 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
3365 | ||
3366 | child_pid = fork (); | |
3367 | if (child_pid == 0) | |
3368 | linux_tracefork_child (NULL); | |
3369 | ||
3370 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3371 | ||
51c2684e | 3372 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
3373 | #ifdef __ia64__ |
3374 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
3375 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 3376 | #else /* !__ia64__ */ |
7407e2de AS |
3377 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
3378 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
3379 | #endif /* !__ia64__ */ |
3380 | ||
3381 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3382 | ||
24a09b5f | 3383 | if (child_pid == -1) |
51c2684e | 3384 | perror_with_name ("clone"); |
24a09b5f DJ |
3385 | |
3386 | ret = my_waitpid (child_pid, &status, 0); | |
3387 | if (ret == -1) | |
3388 | perror_with_name ("waitpid"); | |
3389 | else if (ret != child_pid) | |
3390 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
3391 | if (! WIFSTOPPED (status)) | |
3392 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
3393 | ||
14ce3065 DE |
3394 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
3395 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
3396 | if (ret != 0) |
3397 | { | |
3398 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
3399 | if (ret != 0) | |
3400 | { | |
3401 | warning ("linux_test_for_tracefork: failed to kill child"); | |
3402 | return; | |
3403 | } | |
3404 | ||
3405 | ret = my_waitpid (child_pid, &status, 0); | |
3406 | if (ret != child_pid) | |
3407 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
3408 | else if (!WIFSIGNALED (status)) | |
3409 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
3410 | "killed child", status); | |
3411 | ||
3412 | return; | |
3413 | } | |
3414 | ||
3415 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
3416 | if (ret != 0) | |
3417 | warning ("linux_test_for_tracefork: failed to resume child"); | |
3418 | ||
3419 | ret = my_waitpid (child_pid, &status, 0); | |
3420 | ||
3421 | if (ret == child_pid && WIFSTOPPED (status) | |
3422 | && status >> 16 == PTRACE_EVENT_FORK) | |
3423 | { | |
3424 | second_pid = 0; | |
3425 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
3426 | if (ret == 0 && second_pid != 0) | |
3427 | { | |
3428 | int second_status; | |
3429 | ||
3430 | linux_supports_tracefork_flag = 1; | |
3431 | my_waitpid (second_pid, &second_status, 0); | |
3432 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
3433 | if (ret != 0) | |
3434 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
3435 | my_waitpid (second_pid, &status, 0); | |
3436 | } | |
3437 | } | |
3438 | else | |
3439 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
3440 | "(%d, status 0x%x)", ret, status); | |
3441 | ||
3442 | do | |
3443 | { | |
3444 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
3445 | if (ret != 0) | |
3446 | warning ("linux_test_for_tracefork: failed to kill child"); | |
3447 | my_waitpid (child_pid, &status, 0); | |
3448 | } | |
3449 | while (WIFSTOPPED (status)); | |
51c2684e | 3450 | |
e4b7f41c | 3451 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 3452 | free (stack); |
e4b7f41c | 3453 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
3454 | } |
3455 | ||
3456 | ||
2f2893d9 DJ |
3457 | static void |
3458 | linux_look_up_symbols (void) | |
3459 | { | |
0d62e5e8 | 3460 | #ifdef USE_THREAD_DB |
95954743 PA |
3461 | struct process_info *proc = current_process (); |
3462 | ||
cdbfd419 | 3463 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
3464 | return; |
3465 | ||
6076632b DE |
3466 | /* If the kernel supports tracing forks then it also supports tracing |
3467 | clones, and then we don't need to use the magic thread event breakpoint | |
3468 | to learn about threads. */ | |
cdbfd419 | 3469 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
3470 | #endif |
3471 | } | |
3472 | ||
e5379b03 | 3473 | static void |
ef57601b | 3474 | linux_request_interrupt (void) |
e5379b03 | 3475 | { |
a1928bad | 3476 | extern unsigned long signal_pid; |
e5379b03 | 3477 | |
95954743 PA |
3478 | if (!ptid_equal (cont_thread, null_ptid) |
3479 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 3480 | { |
54a0b537 | 3481 | struct lwp_info *lwp; |
bd99dc85 | 3482 | int lwpid; |
e5379b03 | 3483 | |
54a0b537 | 3484 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
3485 | lwpid = lwpid_of (lwp); |
3486 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
3487 | } |
3488 | else | |
ef57601b | 3489 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
3490 | } |
3491 | ||
aa691b87 RM |
3492 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
3493 | to debugger memory starting at MYADDR. */ | |
3494 | ||
3495 | static int | |
f450004a | 3496 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
3497 | { |
3498 | char filename[PATH_MAX]; | |
3499 | int fd, n; | |
95954743 | 3500 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 3501 | |
95954743 | 3502 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
3503 | |
3504 | fd = open (filename, O_RDONLY); | |
3505 | if (fd < 0) | |
3506 | return -1; | |
3507 | ||
3508 | if (offset != (CORE_ADDR) 0 | |
3509 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
3510 | n = -1; | |
3511 | else | |
3512 | n = read (fd, myaddr, len); | |
3513 | ||
3514 | close (fd); | |
3515 | ||
3516 | return n; | |
3517 | } | |
3518 | ||
d993e290 PA |
3519 | /* These breakpoint and watchpoint related wrapper functions simply |
3520 | pass on the function call if the target has registered a | |
3521 | corresponding function. */ | |
e013ee27 OF |
3522 | |
3523 | static int | |
d993e290 | 3524 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 3525 | { |
d993e290 PA |
3526 | if (the_low_target.insert_point != NULL) |
3527 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
3528 | else |
3529 | /* Unsupported (see target.h). */ | |
3530 | return 1; | |
3531 | } | |
3532 | ||
3533 | static int | |
d993e290 | 3534 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 3535 | { |
d993e290 PA |
3536 | if (the_low_target.remove_point != NULL) |
3537 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
3538 | else |
3539 | /* Unsupported (see target.h). */ | |
3540 | return 1; | |
3541 | } | |
3542 | ||
3543 | static int | |
3544 | linux_stopped_by_watchpoint (void) | |
3545 | { | |
c3adc08c PA |
3546 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
3547 | ||
3548 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
3549 | } |
3550 | ||
3551 | static CORE_ADDR | |
3552 | linux_stopped_data_address (void) | |
3553 | { | |
c3adc08c PA |
3554 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
3555 | ||
3556 | return lwp->stopped_data_address; | |
e013ee27 OF |
3557 | } |
3558 | ||
42c81e2a | 3559 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
3560 | #if defined(__mcoldfire__) |
3561 | /* These should really be defined in the kernel's ptrace.h header. */ | |
3562 | #define PT_TEXT_ADDR 49*4 | |
3563 | #define PT_DATA_ADDR 50*4 | |
3564 | #define PT_TEXT_END_ADDR 51*4 | |
3565 | #endif | |
3566 | ||
3567 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
3568 | to tell gdb about. */ | |
3569 | ||
3570 | static int | |
3571 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
3572 | { | |
3573 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
3574 | unsigned long text, text_end, data; | |
bd99dc85 | 3575 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
3576 | |
3577 | errno = 0; | |
3578 | ||
3579 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
3580 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
3581 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
3582 | ||
3583 | if (errno == 0) | |
3584 | { | |
3585 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
3586 | used by gdb) are relative to the beginning of the program, |
3587 | with the data segment immediately following the text segment. | |
3588 | However, the actual runtime layout in memory may put the data | |
3589 | somewhere else, so when we send gdb a data base-address, we | |
3590 | use the real data base address and subtract the compile-time | |
3591 | data base-address from it (which is just the length of the | |
3592 | text segment). BSS immediately follows data in both | |
3593 | cases. */ | |
52fb6437 NS |
3594 | *text_p = text; |
3595 | *data_p = data - (text_end - text); | |
1b3f6016 | 3596 | |
52fb6437 NS |
3597 | return 1; |
3598 | } | |
3599 | #endif | |
3600 | return 0; | |
3601 | } | |
3602 | #endif | |
3603 | ||
dc146f7c VP |
3604 | static int |
3605 | compare_ints (const void *xa, const void *xb) | |
3606 | { | |
3607 | int a = *(const int *)xa; | |
3608 | int b = *(const int *)xb; | |
3609 | ||
3610 | return a - b; | |
3611 | } | |
3612 | ||
3613 | static int * | |
3614 | unique (int *b, int *e) | |
3615 | { | |
3616 | int *d = b; | |
3617 | while (++b != e) | |
3618 | if (*d != *b) | |
3619 | *++d = *b; | |
3620 | return ++d; | |
3621 | } | |
3622 | ||
3623 | /* Given PID, iterates over all threads in that process. | |
3624 | ||
3625 | Information about each thread, in a format suitable for qXfer:osdata:thread | |
3626 | is printed to BUFFER, if it's not NULL. BUFFER is assumed to be already | |
3627 | initialized, and the caller is responsible for finishing and appending '\0' | |
3628 | to it. | |
3629 | ||
3630 | The list of cores that threads are running on is assigned to *CORES, if it | |
3631 | is not NULL. If no cores are found, *CORES will be set to NULL. Caller | |
3632 | should free *CORES. */ | |
3633 | ||
3634 | static void | |
3635 | list_threads (int pid, struct buffer *buffer, char **cores) | |
3636 | { | |
3637 | int count = 0; | |
3638 | int allocated = 10; | |
3639 | int *core_numbers = xmalloc (sizeof (int) * allocated); | |
3640 | char pathname[128]; | |
3641 | DIR *dir; | |
3642 | struct dirent *dp; | |
3643 | struct stat statbuf; | |
3644 | ||
3645 | sprintf (pathname, "/proc/%d/task", pid); | |
3646 | if (stat (pathname, &statbuf) == 0 && S_ISDIR (statbuf.st_mode)) | |
3647 | { | |
3648 | dir = opendir (pathname); | |
3649 | if (!dir) | |
3650 | { | |
3651 | free (core_numbers); | |
3652 | return; | |
3653 | } | |
3654 | ||
3655 | while ((dp = readdir (dir)) != NULL) | |
3656 | { | |
3657 | unsigned long lwp = strtoul (dp->d_name, NULL, 10); | |
3658 | ||
3659 | if (lwp != 0) | |
3660 | { | |
3661 | unsigned core = linux_core_of_thread (ptid_build (pid, lwp, 0)); | |
3662 | ||
3663 | if (core != -1) | |
3664 | { | |
3665 | char s[sizeof ("4294967295")]; | |
3666 | sprintf (s, "%u", core); | |
3667 | ||
3668 | if (count == allocated) | |
3669 | { | |
3670 | allocated *= 2; | |
3671 | core_numbers = realloc (core_numbers, | |
3672 | sizeof (int) * allocated); | |
3673 | } | |
3674 | core_numbers[count++] = core; | |
3675 | if (buffer) | |
3676 | buffer_xml_printf (buffer, | |
3677 | "<item>" | |
3678 | "<column name=\"pid\">%d</column>" | |
3679 | "<column name=\"tid\">%s</column>" | |
3680 | "<column name=\"core\">%s</column>" | |
3681 | "</item>", pid, dp->d_name, s); | |
3682 | } | |
3683 | else | |
3684 | { | |
3685 | if (buffer) | |
3686 | buffer_xml_printf (buffer, | |
3687 | "<item>" | |
3688 | "<column name=\"pid\">%d</column>" | |
3689 | "<column name=\"tid\">%s</column>" | |
3690 | "</item>", pid, dp->d_name); | |
3691 | } | |
3692 | } | |
3693 | } | |
3694 | } | |
3695 | ||
3696 | if (cores) | |
3697 | { | |
3698 | *cores = NULL; | |
3699 | if (count > 0) | |
3700 | { | |
3701 | struct buffer buffer2; | |
3702 | int *b; | |
3703 | int *e; | |
3704 | qsort (core_numbers, count, sizeof (int), compare_ints); | |
3705 | ||
3706 | /* Remove duplicates. */ | |
3707 | b = core_numbers; | |
3708 | e = unique (b, core_numbers + count); | |
3709 | ||
3710 | buffer_init (&buffer2); | |
3711 | ||
3712 | for (b = core_numbers; b != e; ++b) | |
3713 | { | |
3714 | char number[sizeof ("4294967295")]; | |
3715 | sprintf (number, "%u", *b); | |
3716 | buffer_xml_printf (&buffer2, "%s%s", | |
3717 | (b == core_numbers) ? "" : ",", number); | |
3718 | } | |
3719 | buffer_grow_str0 (&buffer2, ""); | |
3720 | ||
3721 | *cores = buffer_finish (&buffer2); | |
3722 | } | |
3723 | } | |
3724 | free (core_numbers); | |
3725 | } | |
3726 | ||
3727 | static void | |
3728 | show_process (int pid, const char *username, struct buffer *buffer) | |
3729 | { | |
3730 | char pathname[128]; | |
3731 | FILE *f; | |
3732 | char cmd[MAXPATHLEN + 1]; | |
3733 | ||
3734 | sprintf (pathname, "/proc/%d/cmdline", pid); | |
3735 | ||
3736 | if ((f = fopen (pathname, "r")) != NULL) | |
3737 | { | |
3738 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
3739 | if (len > 0) | |
3740 | { | |
3741 | char *cores = 0; | |
3742 | int i; | |
3743 | for (i = 0; i < len; i++) | |
3744 | if (cmd[i] == '\0') | |
3745 | cmd[i] = ' '; | |
3746 | cmd[len] = '\0'; | |
3747 | ||
3748 | buffer_xml_printf (buffer, | |
3749 | "<item>" | |
3750 | "<column name=\"pid\">%d</column>" | |
3751 | "<column name=\"user\">%s</column>" | |
3752 | "<column name=\"command\">%s</column>", | |
3753 | pid, | |
3754 | username, | |
3755 | cmd); | |
3756 | ||
3757 | /* This only collects core numbers, and does not print threads. */ | |
3758 | list_threads (pid, NULL, &cores); | |
3759 | ||
3760 | if (cores) | |
3761 | { | |
3762 | buffer_xml_printf (buffer, | |
3763 | "<column name=\"cores\">%s</column>", cores); | |
3764 | free (cores); | |
3765 | } | |
3766 | ||
3767 | buffer_xml_printf (buffer, "</item>"); | |
3768 | } | |
3769 | fclose (f); | |
3770 | } | |
3771 | } | |
3772 | ||
07e059b5 VP |
3773 | static int |
3774 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
3775 | unsigned char *readbuf, unsigned const char *writebuf, |
3776 | CORE_ADDR offset, int len) | |
07e059b5 VP |
3777 | { |
3778 | /* We make the process list snapshot when the object starts to be | |
3779 | read. */ | |
3780 | static const char *buf; | |
3781 | static long len_avail = -1; | |
3782 | static struct buffer buffer; | |
dc146f7c VP |
3783 | int processes = 0; |
3784 | int threads = 0; | |
07e059b5 VP |
3785 | |
3786 | DIR *dirp; | |
3787 | ||
dc146f7c VP |
3788 | if (strcmp (annex, "processes") == 0) |
3789 | processes = 1; | |
3790 | else if (strcmp (annex, "threads") == 0) | |
3791 | threads = 1; | |
3792 | else | |
07e059b5 VP |
3793 | return 0; |
3794 | ||
3795 | if (!readbuf || writebuf) | |
3796 | return 0; | |
3797 | ||
3798 | if (offset == 0) | |
3799 | { | |
3800 | if (len_avail != -1 && len_avail != 0) | |
3801 | buffer_free (&buffer); | |
3802 | len_avail = 0; | |
3803 | buf = NULL; | |
3804 | buffer_init (&buffer); | |
dc146f7c VP |
3805 | if (processes) |
3806 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
3807 | else if (threads) | |
3808 | buffer_grow_str (&buffer, "<osdata type=\"threads\">"); | |
07e059b5 VP |
3809 | |
3810 | dirp = opendir ("/proc"); | |
3811 | if (dirp) | |
3812 | { | |
1b3f6016 PA |
3813 | struct dirent *dp; |
3814 | while ((dp = readdir (dirp)) != NULL) | |
3815 | { | |
3816 | struct stat statbuf; | |
3817 | char procentry[sizeof ("/proc/4294967295")]; | |
3818 | ||
3819 | if (!isdigit (dp->d_name[0]) | |
3820 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
3821 | continue; | |
3822 | ||
3823 | sprintf (procentry, "/proc/%s", dp->d_name); | |
3824 | if (stat (procentry, &statbuf) == 0 | |
3825 | && S_ISDIR (statbuf.st_mode)) | |
3826 | { | |
dc146f7c | 3827 | int pid = (int) strtoul (dp->d_name, NULL, 10); |
1b3f6016 | 3828 | |
dc146f7c | 3829 | if (processes) |
1b3f6016 | 3830 | { |
dc146f7c VP |
3831 | struct passwd *entry = getpwuid (statbuf.st_uid); |
3832 | show_process (pid, entry ? entry->pw_name : "?", &buffer); | |
3833 | } | |
3834 | else if (threads) | |
3835 | { | |
3836 | list_threads (pid, &buffer, NULL); | |
1b3f6016 PA |
3837 | } |
3838 | } | |
3839 | } | |
07e059b5 | 3840 | |
1b3f6016 | 3841 | closedir (dirp); |
07e059b5 VP |
3842 | } |
3843 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
3844 | buf = buffer_finish (&buffer); | |
3845 | len_avail = strlen (buf); | |
3846 | } | |
3847 | ||
3848 | if (offset >= len_avail) | |
3849 | { | |
3850 | /* Done. Get rid of the data. */ | |
3851 | buffer_free (&buffer); | |
3852 | buf = NULL; | |
3853 | len_avail = 0; | |
3854 | return 0; | |
3855 | } | |
3856 | ||
3857 | if (len > len_avail - offset) | |
3858 | len = len_avail - offset; | |
3859 | memcpy (readbuf, buf + offset, len); | |
3860 | ||
3861 | return len; | |
3862 | } | |
3863 | ||
d0722149 DE |
3864 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3865 | layout of the inferiors' architecture. */ | |
3866 | ||
3867 | static void | |
3868 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
3869 | { | |
3870 | int done = 0; | |
3871 | ||
3872 | if (the_low_target.siginfo_fixup != NULL) | |
3873 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
3874 | ||
3875 | /* If there was no callback, or the callback didn't do anything, | |
3876 | then just do a straight memcpy. */ | |
3877 | if (!done) | |
3878 | { | |
3879 | if (direction == 1) | |
3880 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3881 | else | |
3882 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3883 | } | |
3884 | } | |
3885 | ||
4aa995e1 PA |
3886 | static int |
3887 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
3888 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
3889 | { | |
d0722149 | 3890 | int pid; |
4aa995e1 | 3891 | struct siginfo siginfo; |
d0722149 | 3892 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3893 | |
3894 | if (current_inferior == NULL) | |
3895 | return -1; | |
3896 | ||
bd99dc85 | 3897 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
3898 | |
3899 | if (debug_threads) | |
d0722149 | 3900 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
3901 | readbuf != NULL ? "Reading" : "Writing", |
3902 | pid); | |
3903 | ||
3904 | if (offset > sizeof (siginfo)) | |
3905 | return -1; | |
3906 | ||
3907 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
3908 | return -1; | |
3909 | ||
d0722149 DE |
3910 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
3911 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3912 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
3913 | with a 32-bit GDBSERVER, we need to convert it. */ | |
3914 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3915 | ||
4aa995e1 PA |
3916 | if (offset + len > sizeof (siginfo)) |
3917 | len = sizeof (siginfo) - offset; | |
3918 | ||
3919 | if (readbuf != NULL) | |
d0722149 | 3920 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3921 | else |
3922 | { | |
d0722149 DE |
3923 | memcpy (inf_siginfo + offset, writebuf, len); |
3924 | ||
3925 | /* Convert back to ptrace layout before flushing it out. */ | |
3926 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3927 | ||
4aa995e1 PA |
3928 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
3929 | return -1; | |
3930 | } | |
3931 | ||
3932 | return len; | |
3933 | } | |
3934 | ||
bd99dc85 PA |
3935 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
3936 | so we notice when children change state; as the handler for the | |
3937 | sigsuspend in my_waitpid. */ | |
3938 | ||
3939 | static void | |
3940 | sigchld_handler (int signo) | |
3941 | { | |
3942 | int old_errno = errno; | |
3943 | ||
3944 | if (debug_threads) | |
3945 | /* fprintf is not async-signal-safe, so call write directly. */ | |
3946 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
3947 | ||
3948 | if (target_is_async_p ()) | |
3949 | async_file_mark (); /* trigger a linux_wait */ | |
3950 | ||
3951 | errno = old_errno; | |
3952 | } | |
3953 | ||
3954 | static int | |
3955 | linux_supports_non_stop (void) | |
3956 | { | |
3957 | return 1; | |
3958 | } | |
3959 | ||
3960 | static int | |
3961 | linux_async (int enable) | |
3962 | { | |
3963 | int previous = (linux_event_pipe[0] != -1); | |
3964 | ||
3965 | if (previous != enable) | |
3966 | { | |
3967 | sigset_t mask; | |
3968 | sigemptyset (&mask); | |
3969 | sigaddset (&mask, SIGCHLD); | |
3970 | ||
3971 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
3972 | ||
3973 | if (enable) | |
3974 | { | |
3975 | if (pipe (linux_event_pipe) == -1) | |
3976 | fatal ("creating event pipe failed."); | |
3977 | ||
3978 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
3979 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
3980 | ||
3981 | /* Register the event loop handler. */ | |
3982 | add_file_handler (linux_event_pipe[0], | |
3983 | handle_target_event, NULL); | |
3984 | ||
3985 | /* Always trigger a linux_wait. */ | |
3986 | async_file_mark (); | |
3987 | } | |
3988 | else | |
3989 | { | |
3990 | delete_file_handler (linux_event_pipe[0]); | |
3991 | ||
3992 | close (linux_event_pipe[0]); | |
3993 | close (linux_event_pipe[1]); | |
3994 | linux_event_pipe[0] = -1; | |
3995 | linux_event_pipe[1] = -1; | |
3996 | } | |
3997 | ||
3998 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
3999 | } | |
4000 | ||
4001 | return previous; | |
4002 | } | |
4003 | ||
4004 | static int | |
4005 | linux_start_non_stop (int nonstop) | |
4006 | { | |
4007 | /* Register or unregister from event-loop accordingly. */ | |
4008 | linux_async (nonstop); | |
4009 | return 0; | |
4010 | } | |
4011 | ||
cf8fd78b PA |
4012 | static int |
4013 | linux_supports_multi_process (void) | |
4014 | { | |
4015 | return 1; | |
4016 | } | |
4017 | ||
efcbbd14 UW |
4018 | |
4019 | /* Enumerate spufs IDs for process PID. */ | |
4020 | static int | |
4021 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
4022 | { | |
4023 | int pos = 0; | |
4024 | int written = 0; | |
4025 | char path[128]; | |
4026 | DIR *dir; | |
4027 | struct dirent *entry; | |
4028 | ||
4029 | sprintf (path, "/proc/%ld/fd", pid); | |
4030 | dir = opendir (path); | |
4031 | if (!dir) | |
4032 | return -1; | |
4033 | ||
4034 | rewinddir (dir); | |
4035 | while ((entry = readdir (dir)) != NULL) | |
4036 | { | |
4037 | struct stat st; | |
4038 | struct statfs stfs; | |
4039 | int fd; | |
4040 | ||
4041 | fd = atoi (entry->d_name); | |
4042 | if (!fd) | |
4043 | continue; | |
4044 | ||
4045 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4046 | if (stat (path, &st) != 0) | |
4047 | continue; | |
4048 | if (!S_ISDIR (st.st_mode)) | |
4049 | continue; | |
4050 | ||
4051 | if (statfs (path, &stfs) != 0) | |
4052 | continue; | |
4053 | if (stfs.f_type != SPUFS_MAGIC) | |
4054 | continue; | |
4055 | ||
4056 | if (pos >= offset && pos + 4 <= offset + len) | |
4057 | { | |
4058 | *(unsigned int *)(buf + pos - offset) = fd; | |
4059 | written += 4; | |
4060 | } | |
4061 | pos += 4; | |
4062 | } | |
4063 | ||
4064 | closedir (dir); | |
4065 | return written; | |
4066 | } | |
4067 | ||
4068 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4069 | object type, using the /proc file system. */ | |
4070 | static int | |
4071 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4072 | unsigned const char *writebuf, | |
4073 | CORE_ADDR offset, int len) | |
4074 | { | |
4075 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4076 | char buf[128]; | |
4077 | int fd = 0; | |
4078 | int ret = 0; | |
4079 | ||
4080 | if (!writebuf && !readbuf) | |
4081 | return -1; | |
4082 | ||
4083 | if (!*annex) | |
4084 | { | |
4085 | if (!readbuf) | |
4086 | return -1; | |
4087 | else | |
4088 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4089 | } | |
4090 | ||
4091 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
4092 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4093 | if (fd <= 0) | |
4094 | return -1; | |
4095 | ||
4096 | if (offset != 0 | |
4097 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4098 | { | |
4099 | close (fd); | |
4100 | return 0; | |
4101 | } | |
4102 | ||
4103 | if (writebuf) | |
4104 | ret = write (fd, writebuf, (size_t) len); | |
4105 | else | |
4106 | ret = read (fd, readbuf, (size_t) len); | |
4107 | ||
4108 | close (fd); | |
4109 | return ret; | |
4110 | } | |
4111 | ||
dc146f7c VP |
4112 | static int |
4113 | linux_core_of_thread (ptid_t ptid) | |
4114 | { | |
4115 | char filename[sizeof ("/proc//task//stat") | |
4116 | + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */ | |
4117 | + 1]; | |
4118 | FILE *f; | |
4119 | char *content = NULL; | |
4120 | char *p; | |
4121 | char *ts = 0; | |
4122 | int content_read = 0; | |
4123 | int i; | |
4124 | int core; | |
4125 | ||
4126 | sprintf (filename, "/proc/%d/task/%ld/stat", | |
4127 | ptid_get_pid (ptid), ptid_get_lwp (ptid)); | |
4128 | f = fopen (filename, "r"); | |
4129 | if (!f) | |
4130 | return -1; | |
4131 | ||
4132 | for (;;) | |
4133 | { | |
4134 | int n; | |
4135 | content = realloc (content, content_read + 1024); | |
4136 | n = fread (content + content_read, 1, 1024, f); | |
4137 | content_read += n; | |
4138 | if (n < 1024) | |
4139 | { | |
4140 | content[content_read] = '\0'; | |
4141 | break; | |
4142 | } | |
4143 | } | |
4144 | ||
4145 | p = strchr (content, '('); | |
4146 | p = strchr (p, ')') + 2; /* skip ")" and a whitespace. */ | |
4147 | ||
4148 | p = strtok_r (p, " ", &ts); | |
4149 | for (i = 0; i != 36; ++i) | |
4150 | p = strtok_r (NULL, " ", &ts); | |
4151 | ||
4152 | if (sscanf (p, "%d", &core) == 0) | |
4153 | core = -1; | |
4154 | ||
4155 | free (content); | |
4156 | fclose (f); | |
4157 | ||
4158 | return core; | |
4159 | } | |
4160 | ||
1570b33e L |
4161 | static void |
4162 | linux_process_qsupported (const char *query) | |
4163 | { | |
4164 | if (the_low_target.process_qsupported != NULL) | |
4165 | the_low_target.process_qsupported (query); | |
4166 | } | |
4167 | ||
ce3a066d DJ |
4168 | static struct target_ops linux_target_ops = { |
4169 | linux_create_inferior, | |
4170 | linux_attach, | |
4171 | linux_kill, | |
6ad8ae5c | 4172 | linux_detach, |
444d6139 | 4173 | linux_join, |
ce3a066d DJ |
4174 | linux_thread_alive, |
4175 | linux_resume, | |
4176 | linux_wait, | |
4177 | linux_fetch_registers, | |
4178 | linux_store_registers, | |
4179 | linux_read_memory, | |
4180 | linux_write_memory, | |
2f2893d9 | 4181 | linux_look_up_symbols, |
ef57601b | 4182 | linux_request_interrupt, |
aa691b87 | 4183 | linux_read_auxv, |
d993e290 PA |
4184 | linux_insert_point, |
4185 | linux_remove_point, | |
e013ee27 OF |
4186 | linux_stopped_by_watchpoint, |
4187 | linux_stopped_data_address, | |
42c81e2a | 4188 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 4189 | linux_read_offsets, |
dae5f5cf DJ |
4190 | #else |
4191 | NULL, | |
4192 | #endif | |
4193 | #ifdef USE_THREAD_DB | |
4194 | thread_db_get_tls_address, | |
4195 | #else | |
4196 | NULL, | |
52fb6437 | 4197 | #endif |
efcbbd14 | 4198 | linux_qxfer_spu, |
59a016f0 | 4199 | hostio_last_error_from_errno, |
07e059b5 | 4200 | linux_qxfer_osdata, |
4aa995e1 | 4201 | linux_xfer_siginfo, |
bd99dc85 PA |
4202 | linux_supports_non_stop, |
4203 | linux_async, | |
4204 | linux_start_non_stop, | |
cdbfd419 PP |
4205 | linux_supports_multi_process, |
4206 | #ifdef USE_THREAD_DB | |
dc146f7c | 4207 | thread_db_handle_monitor_command, |
cdbfd419 | 4208 | #else |
dc146f7c | 4209 | NULL, |
cdbfd419 | 4210 | #endif |
1570b33e L |
4211 | linux_core_of_thread, |
4212 | linux_process_qsupported | |
ce3a066d DJ |
4213 | }; |
4214 | ||
0d62e5e8 DJ |
4215 | static void |
4216 | linux_init_signals () | |
4217 | { | |
4218 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
4219 | to find what the cancel signal actually is. */ | |
60c3d7b0 | 4220 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 4221 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 4222 | #endif |
0d62e5e8 DJ |
4223 | } |
4224 | ||
da6d8c04 DJ |
4225 | void |
4226 | initialize_low (void) | |
4227 | { | |
bd99dc85 PA |
4228 | struct sigaction sigchld_action; |
4229 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 4230 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
4231 | set_breakpoint_data (the_low_target.breakpoint, |
4232 | the_low_target.breakpoint_len); | |
0d62e5e8 | 4233 | linux_init_signals (); |
24a09b5f | 4234 | linux_test_for_tracefork (); |
52fa2412 UW |
4235 | #ifdef HAVE_LINUX_REGSETS |
4236 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
4237 | ; | |
bca929d3 | 4238 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 4239 | #endif |
bd99dc85 PA |
4240 | |
4241 | sigchld_action.sa_handler = sigchld_handler; | |
4242 | sigemptyset (&sigchld_action.sa_mask); | |
4243 | sigchld_action.sa_flags = SA_RESTART; | |
4244 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 4245 | } |