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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, |
0fb0cc75 | 3 | 2006, 2007, 2008, 2009 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" |
d0722149 DE |
22 | #include "ansidecl.h" /* For ATTRIBUTE_PACKED, must be bug in external.h. */ |
23 | #include "elf/common.h" | |
24 | #include "elf/external.h" | |
da6d8c04 | 25 | |
58caa3dc | 26 | #include <sys/wait.h> |
da6d8c04 DJ |
27 | #include <stdio.h> |
28 | #include <sys/param.h> | |
da6d8c04 | 29 | #include <sys/ptrace.h> |
da6d8c04 DJ |
30 | #include <signal.h> |
31 | #include <sys/ioctl.h> | |
32 | #include <fcntl.h> | |
d07c63e7 | 33 | #include <string.h> |
0a30fbc4 DJ |
34 | #include <stdlib.h> |
35 | #include <unistd.h> | |
fa6a77dc | 36 | #include <errno.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
efcbbd14 UW |
43 | #include <sys/stat.h> |
44 | #include <sys/vfs.h> | |
45 | ||
46 | #ifndef SPUFS_MAGIC | |
47 | #define SPUFS_MAGIC 0x23c9b64e | |
48 | #endif | |
da6d8c04 | 49 | |
32ca6d61 DJ |
50 | #ifndef PTRACE_GETSIGINFO |
51 | # define PTRACE_GETSIGINFO 0x4202 | |
52 | # define PTRACE_SETSIGINFO 0x4203 | |
53 | #endif | |
54 | ||
fd462a61 DJ |
55 | #ifndef O_LARGEFILE |
56 | #define O_LARGEFILE 0 | |
57 | #endif | |
58 | ||
24a09b5f DJ |
59 | /* If the system headers did not provide the constants, hard-code the normal |
60 | values. */ | |
61 | #ifndef PTRACE_EVENT_FORK | |
62 | ||
63 | #define PTRACE_SETOPTIONS 0x4200 | |
64 | #define PTRACE_GETEVENTMSG 0x4201 | |
65 | ||
66 | /* options set using PTRACE_SETOPTIONS */ | |
67 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
68 | #define PTRACE_O_TRACEFORK 0x00000002 | |
69 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
70 | #define PTRACE_O_TRACECLONE 0x00000008 | |
71 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
72 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 | |
73 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
74 | ||
75 | /* Wait extended result codes for the above trace options. */ | |
76 | #define PTRACE_EVENT_FORK 1 | |
77 | #define PTRACE_EVENT_VFORK 2 | |
78 | #define PTRACE_EVENT_CLONE 3 | |
79 | #define PTRACE_EVENT_EXEC 4 | |
80 | #define PTRACE_EVENT_VFORK_DONE 5 | |
81 | #define PTRACE_EVENT_EXIT 6 | |
82 | ||
83 | #endif /* PTRACE_EVENT_FORK */ | |
84 | ||
85 | /* We can't always assume that this flag is available, but all systems | |
86 | with the ptrace event handlers also have __WALL, so it's safe to use | |
87 | in some contexts. */ | |
88 | #ifndef __WALL | |
89 | #define __WALL 0x40000000 /* Wait for any child. */ | |
90 | #endif | |
91 | ||
42c81e2a DJ |
92 | #ifdef __UCLIBC__ |
93 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
94 | #define HAS_NOMMU | |
95 | #endif | |
96 | #endif | |
97 | ||
24a09b5f DJ |
98 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
99 | representation of the thread ID. | |
611cb4a5 | 100 | |
54a0b537 | 101 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
102 | the same as the LWP ID. |
103 | ||
104 | ``all_processes'' is keyed by the "overall process ID", which | |
105 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 106 | |
54a0b537 | 107 | struct inferior_list all_lwps; |
0d62e5e8 | 108 | |
24a09b5f DJ |
109 | /* A list of all unknown processes which receive stop signals. Some other |
110 | process will presumably claim each of these as forked children | |
111 | momentarily. */ | |
112 | ||
113 | struct inferior_list stopped_pids; | |
114 | ||
0d62e5e8 DJ |
115 | /* FIXME this is a bit of a hack, and could be removed. */ |
116 | int stopping_threads; | |
117 | ||
118 | /* FIXME make into a target method? */ | |
24a09b5f | 119 | int using_threads = 1; |
24a09b5f | 120 | |
95954743 PA |
121 | /* This flag is true iff we've just created or attached to our first |
122 | inferior but it has not stopped yet. As soon as it does, we need | |
123 | to call the low target's arch_setup callback. Doing this only on | |
124 | the first inferior avoids reinializing the architecture on every | |
125 | inferior, and avoids messing with the register caches of the | |
126 | already running inferiors. NOTE: this assumes all inferiors under | |
127 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
128 | static int new_inferior; |
129 | ||
2acc282a | 130 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 131 | int step, int signal, siginfo_t *info); |
2bd7c093 | 132 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
54a0b537 | 133 | static void stop_all_lwps (void); |
95954743 | 134 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
54a0b537 | 135 | static int check_removed_breakpoint (struct lwp_info *event_child); |
95954743 | 136 | static void *add_lwp (ptid_t ptid); |
c35fafde | 137 | static int linux_stopped_by_watchpoint (void); |
95954743 | 138 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
0d62e5e8 DJ |
139 | |
140 | struct pending_signals | |
141 | { | |
142 | int signal; | |
32ca6d61 | 143 | siginfo_t info; |
0d62e5e8 DJ |
144 | struct pending_signals *prev; |
145 | }; | |
611cb4a5 | 146 | |
d844cde6 | 147 | #define PTRACE_ARG3_TYPE long |
c6ecbae5 | 148 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 149 | |
58caa3dc | 150 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
151 | static char *disabled_regsets; |
152 | static int num_regsets; | |
58caa3dc DJ |
153 | #endif |
154 | ||
bd99dc85 PA |
155 | /* The read/write ends of the pipe registered as waitable file in the |
156 | event loop. */ | |
157 | static int linux_event_pipe[2] = { -1, -1 }; | |
158 | ||
159 | /* True if we're currently in async mode. */ | |
160 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
161 | ||
162 | static void send_sigstop (struct inferior_list_entry *entry); | |
163 | static void wait_for_sigstop (struct inferior_list_entry *entry); | |
164 | ||
d0722149 DE |
165 | /* Accepts an integer PID; Returns a string representing a file that |
166 | can be opened to get info for the child process. | |
167 | Space for the result is malloc'd, caller must free. */ | |
168 | ||
169 | char * | |
170 | linux_child_pid_to_exec_file (int pid) | |
171 | { | |
172 | char *name1, *name2; | |
173 | ||
174 | name1 = xmalloc (MAXPATHLEN); | |
175 | name2 = xmalloc (MAXPATHLEN); | |
176 | memset (name2, 0, MAXPATHLEN); | |
177 | ||
178 | sprintf (name1, "/proc/%d/exe", pid); | |
179 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
180 | { | |
181 | free (name1); | |
182 | return name2; | |
183 | } | |
184 | else | |
185 | { | |
186 | free (name2); | |
187 | return name1; | |
188 | } | |
189 | } | |
190 | ||
191 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
192 | ||
193 | static int | |
194 | elf_64_header_p (const Elf64_External_Ehdr *header) | |
195 | { | |
196 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
197 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
198 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
199 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
200 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
201 | } | |
202 | ||
203 | /* Return non-zero if FILE is a 64-bit ELF file, | |
204 | zero if the file is not a 64-bit ELF file, | |
205 | and -1 if the file is not accessible or doesn't exist. */ | |
206 | ||
207 | int | |
208 | elf_64_file_p (const char *file) | |
209 | { | |
210 | Elf64_External_Ehdr header; | |
211 | int fd; | |
212 | ||
213 | fd = open (file, O_RDONLY); | |
214 | if (fd < 0) | |
215 | return -1; | |
216 | ||
217 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
218 | { | |
219 | close (fd); | |
220 | return 0; | |
221 | } | |
222 | close (fd); | |
223 | ||
224 | return elf_64_header_p (&header); | |
225 | } | |
226 | ||
bd99dc85 PA |
227 | static void |
228 | delete_lwp (struct lwp_info *lwp) | |
229 | { | |
230 | remove_thread (get_lwp_thread (lwp)); | |
231 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 232 | free (lwp->arch_private); |
bd99dc85 PA |
233 | free (lwp); |
234 | } | |
235 | ||
95954743 PA |
236 | /* Add a process to the common process list, and set its private |
237 | data. */ | |
238 | ||
239 | static struct process_info * | |
240 | linux_add_process (int pid, int attached) | |
241 | { | |
242 | struct process_info *proc; | |
243 | ||
244 | /* Is this the first process? If so, then set the arch. */ | |
245 | if (all_processes.head == NULL) | |
246 | new_inferior = 1; | |
247 | ||
248 | proc = add_process (pid, attached); | |
249 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
250 | ||
aa5ca48f DE |
251 | if (the_low_target.new_process != NULL) |
252 | proc->private->arch_private = the_low_target.new_process (); | |
253 | ||
95954743 PA |
254 | return proc; |
255 | } | |
256 | ||
5091eb23 DE |
257 | /* Remove a process from the common process list, |
258 | also freeing all private data. */ | |
259 | ||
260 | static void | |
ca5c370d | 261 | linux_remove_process (struct process_info *process) |
5091eb23 | 262 | { |
cdbfd419 PP |
263 | struct process_info_private *priv = process->private; |
264 | ||
cdbfd419 PP |
265 | free (priv->arch_private); |
266 | free (priv); | |
5091eb23 DE |
267 | remove_process (process); |
268 | } | |
269 | ||
07d4f67e DE |
270 | /* Wrapper function for waitpid which handles EINTR, and emulates |
271 | __WALL for systems where that is not available. */ | |
272 | ||
273 | static int | |
274 | my_waitpid (int pid, int *status, int flags) | |
275 | { | |
276 | int ret, out_errno; | |
277 | ||
278 | if (debug_threads) | |
279 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
280 | ||
281 | if (flags & __WALL) | |
282 | { | |
283 | sigset_t block_mask, org_mask, wake_mask; | |
284 | int wnohang; | |
285 | ||
286 | wnohang = (flags & WNOHANG) != 0; | |
287 | flags &= ~(__WALL | __WCLONE); | |
288 | flags |= WNOHANG; | |
289 | ||
290 | /* Block all signals while here. This avoids knowing about | |
291 | LinuxThread's signals. */ | |
292 | sigfillset (&block_mask); | |
293 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
294 | ||
295 | /* ... except during the sigsuspend below. */ | |
296 | sigemptyset (&wake_mask); | |
297 | ||
298 | while (1) | |
299 | { | |
300 | /* Since all signals are blocked, there's no need to check | |
301 | for EINTR here. */ | |
302 | ret = waitpid (pid, status, flags); | |
303 | out_errno = errno; | |
304 | ||
305 | if (ret == -1 && out_errno != ECHILD) | |
306 | break; | |
307 | else if (ret > 0) | |
308 | break; | |
309 | ||
310 | if (flags & __WCLONE) | |
311 | { | |
312 | /* We've tried both flavors now. If WNOHANG is set, | |
313 | there's nothing else to do, just bail out. */ | |
314 | if (wnohang) | |
315 | break; | |
316 | ||
317 | if (debug_threads) | |
318 | fprintf (stderr, "blocking\n"); | |
319 | ||
320 | /* Block waiting for signals. */ | |
321 | sigsuspend (&wake_mask); | |
322 | } | |
323 | ||
324 | flags ^= __WCLONE; | |
325 | } | |
326 | ||
327 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
328 | } | |
329 | else | |
330 | { | |
331 | do | |
332 | ret = waitpid (pid, status, flags); | |
333 | while (ret == -1 && errno == EINTR); | |
334 | out_errno = errno; | |
335 | } | |
336 | ||
337 | if (debug_threads) | |
338 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
339 | pid, flags, status ? *status : -1, ret); | |
340 | ||
341 | errno = out_errno; | |
342 | return ret; | |
343 | } | |
344 | ||
bd99dc85 PA |
345 | /* Handle a GNU/Linux extended wait response. If we see a clone |
346 | event, we need to add the new LWP to our list (and not report the | |
347 | trap to higher layers). */ | |
0d62e5e8 | 348 | |
24a09b5f | 349 | static void |
54a0b537 | 350 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
351 | { |
352 | int event = wstat >> 16; | |
54a0b537 | 353 | struct lwp_info *new_lwp; |
24a09b5f DJ |
354 | |
355 | if (event == PTRACE_EVENT_CLONE) | |
356 | { | |
95954743 | 357 | ptid_t ptid; |
24a09b5f | 358 | unsigned long new_pid; |
836acd6d | 359 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 360 | |
bd99dc85 | 361 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
362 | |
363 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
364 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
365 | { | |
366 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
367 | hits the SIGSTOP, but we're already attached. */ | |
368 | ||
97438e3f | 369 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
370 | |
371 | if (ret == -1) | |
372 | perror_with_name ("waiting for new child"); | |
373 | else if (ret != new_pid) | |
374 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 375 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
376 | warning ("wait returned unexpected status 0x%x", status); |
377 | } | |
378 | ||
379 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE); | |
380 | ||
95954743 PA |
381 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
382 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
383 | add_thread (ptid, new_lwp); | |
24a09b5f | 384 | |
e27d73f6 DE |
385 | /* Either we're going to immediately resume the new thread |
386 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
387 | thinks the thread is currently running, so set this first | |
388 | before calling linux_resume_one_lwp. */ | |
389 | new_lwp->stopped = 1; | |
390 | ||
da5898ce DJ |
391 | /* Normally we will get the pending SIGSTOP. But in some cases |
392 | we might get another signal delivered to the group first. | |
f21cc1a2 | 393 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
394 | if (WSTOPSIG (status) == SIGSTOP) |
395 | { | |
e27d73f6 DE |
396 | if (! stopping_threads) |
397 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); | |
da5898ce | 398 | } |
24a09b5f | 399 | else |
da5898ce | 400 | { |
54a0b537 | 401 | new_lwp->stop_expected = 1; |
da5898ce DJ |
402 | if (stopping_threads) |
403 | { | |
54a0b537 PA |
404 | new_lwp->status_pending_p = 1; |
405 | new_lwp->status_pending = status; | |
da5898ce DJ |
406 | } |
407 | else | |
408 | /* Pass the signal on. This is what GDB does - except | |
409 | shouldn't we really report it instead? */ | |
e27d73f6 | 410 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 411 | } |
24a09b5f DJ |
412 | |
413 | /* Always resume the current thread. If we are stopping | |
414 | threads, it will have a pending SIGSTOP; we may as well | |
415 | collect it now. */ | |
2acc282a | 416 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
417 | } |
418 | } | |
419 | ||
0d62e5e8 DJ |
420 | /* This function should only be called if the process got a SIGTRAP. |
421 | The SIGTRAP could mean several things. | |
422 | ||
423 | On i386, where decr_pc_after_break is non-zero: | |
424 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
425 | we will get only the one SIGTRAP (even if the instruction we | |
426 | stepped over was a breakpoint). The value of $eip will be the | |
427 | next instruction. | |
428 | If we continue the process using PTRACE_CONT, we will get a | |
429 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
430 | the instruction after the breakpoint (i.e. needs to be | |
431 | decremented). If we report the SIGTRAP to GDB, we must also | |
432 | report the undecremented PC. If we cancel the SIGTRAP, we | |
433 | must resume at the decremented PC. | |
434 | ||
435 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
436 | with hardware or kernel single-step: | |
437 | If we single-step over a breakpoint instruction, our PC will | |
438 | point at the following instruction. If we continue and hit a | |
439 | breakpoint instruction, our PC will point at the breakpoint | |
440 | instruction. */ | |
441 | ||
442 | static CORE_ADDR | |
443 | get_stop_pc (void) | |
444 | { | |
445 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
446 | ||
47c0c975 DE |
447 | if (! get_thread_lwp (current_inferior)->stepping) |
448 | stop_pc -= the_low_target.decr_pc_after_break; | |
449 | ||
450 | if (debug_threads) | |
451 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
452 | ||
453 | return stop_pc; | |
0d62e5e8 | 454 | } |
ce3a066d | 455 | |
0d62e5e8 | 456 | static void * |
95954743 | 457 | add_lwp (ptid_t ptid) |
611cb4a5 | 458 | { |
54a0b537 | 459 | struct lwp_info *lwp; |
0d62e5e8 | 460 | |
54a0b537 PA |
461 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
462 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 463 | |
95954743 | 464 | lwp->head.id = ptid; |
0d62e5e8 | 465 | |
aa5ca48f DE |
466 | if (the_low_target.new_thread != NULL) |
467 | lwp->arch_private = the_low_target.new_thread (); | |
468 | ||
54a0b537 | 469 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 470 | |
54a0b537 | 471 | return lwp; |
0d62e5e8 | 472 | } |
611cb4a5 | 473 | |
da6d8c04 DJ |
474 | /* Start an inferior process and returns its pid. |
475 | ALLARGS is a vector of program-name and args. */ | |
476 | ||
ce3a066d DJ |
477 | static int |
478 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 479 | { |
a6dbe5df | 480 | struct lwp_info *new_lwp; |
da6d8c04 | 481 | int pid; |
95954743 | 482 | ptid_t ptid; |
da6d8c04 | 483 | |
42c81e2a | 484 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
485 | pid = vfork (); |
486 | #else | |
da6d8c04 | 487 | pid = fork (); |
52fb6437 | 488 | #endif |
da6d8c04 DJ |
489 | if (pid < 0) |
490 | perror_with_name ("fork"); | |
491 | ||
492 | if (pid == 0) | |
493 | { | |
494 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
495 | ||
254787d4 | 496 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 497 | |
a9fa9f7d DJ |
498 | setpgid (0, 0); |
499 | ||
2b876972 DJ |
500 | execv (program, allargs); |
501 | if (errno == ENOENT) | |
502 | execvp (program, allargs); | |
da6d8c04 DJ |
503 | |
504 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 505 | strerror (errno)); |
da6d8c04 DJ |
506 | fflush (stderr); |
507 | _exit (0177); | |
508 | } | |
509 | ||
95954743 PA |
510 | linux_add_process (pid, 0); |
511 | ||
512 | ptid = ptid_build (pid, pid, 0); | |
513 | new_lwp = add_lwp (ptid); | |
514 | add_thread (ptid, new_lwp); | |
a6dbe5df | 515 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 516 | |
a9fa9f7d | 517 | return pid; |
da6d8c04 DJ |
518 | } |
519 | ||
520 | /* Attach to an inferior process. */ | |
521 | ||
95954743 PA |
522 | static void |
523 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 524 | { |
95954743 | 525 | ptid_t ptid; |
54a0b537 | 526 | struct lwp_info *new_lwp; |
611cb4a5 | 527 | |
95954743 | 528 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 529 | { |
95954743 | 530 | if (!initial) |
2d717e4f DJ |
531 | { |
532 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 533 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
534 | strerror (errno), errno); |
535 | fflush (stderr); | |
536 | return; | |
537 | } | |
538 | else | |
539 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 540 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 541 | strerror (errno), errno); |
da6d8c04 DJ |
542 | } |
543 | ||
95954743 PA |
544 | if (initial) |
545 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
546 | ptid = ptid_build (lwpid, lwpid, 0); | |
547 | else | |
548 | { | |
549 | /* Note that extracting the pid from the current inferior is | |
550 | safe, since we're always called in the context of the same | |
551 | process as this new thread. */ | |
552 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
553 | ptid = ptid_build (pid, lwpid, 0); | |
554 | } | |
24a09b5f | 555 | |
95954743 PA |
556 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
557 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 558 | |
a6dbe5df PA |
559 | /* We need to wait for SIGSTOP before being able to make the next |
560 | ptrace call on this LWP. */ | |
561 | new_lwp->must_set_ptrace_flags = 1; | |
562 | ||
0d62e5e8 | 563 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
564 | brings it to a halt. |
565 | ||
566 | There are several cases to consider here: | |
567 | ||
568 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 PA |
569 | of a new thread that is being created. |
570 | In this case we should ignore that SIGSTOP and resume the process. | |
571 | This is handled below by setting stop_expected = 1. | |
0e21c1ec DE |
572 | |
573 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
574 | to it via attach_inferior. |
575 | In this case we want the process thread to stop. | |
576 | This is handled by having linux_attach clear stop_expected after | |
577 | we return. | |
578 | ??? If the process already has several threads we leave the other | |
579 | threads running. | |
0e21c1ec DE |
580 | |
581 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
582 | existing threads. |
583 | In this case we want the thread to stop. | |
584 | FIXME: This case is currently not properly handled. | |
585 | We should wait for the SIGSTOP but don't. Things work apparently | |
586 | because enough time passes between when we ptrace (ATTACH) and when | |
587 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
588 | |
589 | On the other hand, if we are currently trying to stop all threads, we | |
590 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 591 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
592 | end of the list, and so the new thread has not yet reached |
593 | wait_for_sigstop (but will). */ | |
0d62e5e8 | 594 | if (! stopping_threads) |
54a0b537 | 595 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
596 | } |
597 | ||
95954743 PA |
598 | void |
599 | linux_attach_lwp (unsigned long lwpid) | |
600 | { | |
601 | linux_attach_lwp_1 (lwpid, 0); | |
602 | } | |
603 | ||
0d62e5e8 | 604 | int |
a1928bad | 605 | linux_attach (unsigned long pid) |
0d62e5e8 | 606 | { |
54a0b537 | 607 | struct lwp_info *lwp; |
0d62e5e8 | 608 | |
95954743 PA |
609 | linux_attach_lwp_1 (pid, 1); |
610 | ||
611 | linux_add_process (pid, 1); | |
0d62e5e8 | 612 | |
bd99dc85 PA |
613 | if (!non_stop) |
614 | { | |
615 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
616 | process. It will be collected by wait shortly. */ | |
95954743 PA |
617 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
618 | ptid_build (pid, pid, 0)); | |
bd99dc85 PA |
619 | lwp->stop_expected = 0; |
620 | } | |
0d62e5e8 | 621 | |
95954743 PA |
622 | return 0; |
623 | } | |
624 | ||
625 | struct counter | |
626 | { | |
627 | int pid; | |
628 | int count; | |
629 | }; | |
630 | ||
631 | static int | |
632 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
633 | { | |
634 | struct counter *counter = args; | |
635 | ||
636 | if (ptid_get_pid (entry->id) == counter->pid) | |
637 | { | |
638 | if (++counter->count > 1) | |
639 | return 1; | |
640 | } | |
d61ddec4 | 641 | |
da6d8c04 DJ |
642 | return 0; |
643 | } | |
644 | ||
95954743 PA |
645 | static int |
646 | last_thread_of_process_p (struct thread_info *thread) | |
647 | { | |
648 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
649 | int pid = ptid_get_pid (ptid); | |
650 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 651 | |
95954743 PA |
652 | return (find_inferior (&all_threads, |
653 | second_thread_of_pid_p, &counter) == NULL); | |
654 | } | |
655 | ||
656 | /* Kill the inferior lwp. */ | |
657 | ||
658 | static int | |
659 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 660 | { |
0d62e5e8 | 661 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 662 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 663 | int wstat; |
95954743 PA |
664 | int pid = * (int *) args; |
665 | ||
666 | if (ptid_get_pid (entry->id) != pid) | |
667 | return 0; | |
0d62e5e8 | 668 | |
fd500816 DJ |
669 | /* We avoid killing the first thread here, because of a Linux kernel (at |
670 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
671 | the children get a chance to be reaped, it will remain a zombie | |
672 | forever. */ | |
95954743 | 673 | |
12b42a12 | 674 | if (lwpid_of (lwp) == pid) |
95954743 PA |
675 | { |
676 | if (debug_threads) | |
677 | fprintf (stderr, "lkop: is last of process %s\n", | |
678 | target_pid_to_str (entry->id)); | |
679 | return 0; | |
680 | } | |
fd500816 | 681 | |
bd99dc85 PA |
682 | /* If we're killing a running inferior, make sure it is stopped |
683 | first, as PTRACE_KILL will not work otherwise. */ | |
684 | if (!lwp->stopped) | |
685 | send_sigstop (&lwp->head); | |
686 | ||
0d62e5e8 DJ |
687 | do |
688 | { | |
bd99dc85 | 689 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
690 | |
691 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 692 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 693 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
694 | |
695 | return 0; | |
da6d8c04 DJ |
696 | } |
697 | ||
95954743 PA |
698 | static int |
699 | linux_kill (int pid) | |
0d62e5e8 | 700 | { |
95954743 | 701 | struct process_info *process; |
54a0b537 | 702 | struct lwp_info *lwp; |
95954743 | 703 | struct thread_info *thread; |
fd500816 | 704 | int wstat; |
95954743 | 705 | int lwpid; |
fd500816 | 706 | |
95954743 PA |
707 | process = find_process_pid (pid); |
708 | if (process == NULL) | |
709 | return -1; | |
9d606399 | 710 | |
95954743 | 711 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 712 | |
54a0b537 | 713 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 714 | thread in the list, so do so now. */ |
95954743 PA |
715 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
716 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
717 | |
718 | if (debug_threads) | |
95954743 PA |
719 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
720 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
721 | |
722 | /* If we're killing a running inferior, make sure it is stopped | |
723 | first, as PTRACE_KILL will not work otherwise. */ | |
724 | if (!lwp->stopped) | |
725 | send_sigstop (&lwp->head); | |
726 | ||
fd500816 DJ |
727 | do |
728 | { | |
bd99dc85 | 729 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
730 | |
731 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
732 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
733 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 734 | |
ca5c370d PA |
735 | #ifdef USE_THREAD_DB |
736 | thread_db_free (process, 0); | |
737 | #endif | |
bd99dc85 | 738 | delete_lwp (lwp); |
ca5c370d | 739 | linux_remove_process (process); |
95954743 | 740 | return 0; |
0d62e5e8 DJ |
741 | } |
742 | ||
95954743 PA |
743 | static int |
744 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
745 | { |
746 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 747 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
748 | int pid = * (int *) args; |
749 | ||
750 | if (ptid_get_pid (entry->id) != pid) | |
751 | return 0; | |
6ad8ae5c | 752 | |
bd99dc85 PA |
753 | /* If we're detaching from a running inferior, make sure it is |
754 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
755 | if (!lwp->stopped) | |
756 | { | |
95954743 | 757 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
758 | |
759 | stopping_threads = 1; | |
760 | send_sigstop (&lwp->head); | |
761 | ||
762 | /* If this detects a new thread through a clone event, the new | |
763 | thread is appended to the end of the lwp list, so we'll | |
764 | eventually detach from it. */ | |
765 | wait_for_sigstop (&lwp->head); | |
766 | stopping_threads = 0; | |
767 | ||
768 | /* If LWP exits while we're trying to stop it, there's nothing | |
769 | left to do. */ | |
95954743 | 770 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 771 | if (lwp == NULL) |
95954743 | 772 | return 0; |
bd99dc85 PA |
773 | } |
774 | ||
ae13219e DJ |
775 | /* Make sure the process isn't stopped at a breakpoint that's |
776 | no longer there. */ | |
54a0b537 | 777 | check_removed_breakpoint (lwp); |
ae13219e DJ |
778 | |
779 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
780 | sure we take care of that now. This isn't absolutely guaranteed | |
781 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 782 | if (lwp->stop_expected) |
ae13219e | 783 | { |
bd99dc85 | 784 | int wstat; |
ae13219e | 785 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
786 | lwp->stop_expected = 0; |
787 | if (lwp->stopped) | |
2acc282a | 788 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 789 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
790 | } |
791 | ||
792 | /* Flush any pending changes to the process's registers. */ | |
793 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 794 | get_lwp_thread (lwp)); |
ae13219e DJ |
795 | |
796 | /* Finally, let it resume. */ | |
bd99dc85 PA |
797 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
798 | ||
799 | delete_lwp (lwp); | |
95954743 | 800 | return 0; |
6ad8ae5c DJ |
801 | } |
802 | ||
dd6953e1 | 803 | static int |
95954743 | 804 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 805 | { |
95954743 PA |
806 | int *pid_p = args; |
807 | ||
808 | if (ptid_get_pid (entry->id) == *pid_p) | |
809 | return 1; | |
810 | ||
811 | return 0; | |
812 | } | |
813 | ||
814 | static int | |
815 | linux_detach (int pid) | |
816 | { | |
817 | struct process_info *process; | |
818 | ||
819 | process = find_process_pid (pid); | |
820 | if (process == NULL) | |
821 | return -1; | |
822 | ||
ca5c370d PA |
823 | #ifdef USE_THREAD_DB |
824 | thread_db_free (process, 1); | |
825 | #endif | |
826 | ||
95954743 PA |
827 | current_inferior = |
828 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
829 | ||
ae13219e | 830 | delete_all_breakpoints (); |
95954743 | 831 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
ca5c370d | 832 | linux_remove_process (process); |
dd6953e1 | 833 | return 0; |
6ad8ae5c DJ |
834 | } |
835 | ||
444d6139 | 836 | static void |
95954743 | 837 | linux_join (int pid) |
444d6139 | 838 | { |
444d6139 | 839 | int status, ret; |
95954743 | 840 | struct process_info *process; |
bd99dc85 | 841 | |
95954743 PA |
842 | process = find_process_pid (pid); |
843 | if (process == NULL) | |
844 | return; | |
444d6139 PA |
845 | |
846 | do { | |
95954743 | 847 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
848 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
849 | break; | |
850 | } while (ret != -1 || errno != ECHILD); | |
851 | } | |
852 | ||
6ad8ae5c | 853 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 854 | static int |
95954743 | 855 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 856 | { |
95954743 PA |
857 | struct lwp_info *lwp = find_lwp_pid (ptid); |
858 | ||
859 | /* We assume we always know if a thread exits. If a whole process | |
860 | exited but we still haven't been able to report it to GDB, we'll | |
861 | hold on to the last lwp of the dead process. */ | |
862 | if (lwp != NULL) | |
863 | return !lwp->dead; | |
0d62e5e8 DJ |
864 | else |
865 | return 0; | |
866 | } | |
867 | ||
868 | /* Return nonzero if this process stopped at a breakpoint which | |
869 | no longer appears to be inserted. Also adjust the PC | |
870 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 871 | static int |
54a0b537 | 872 | check_removed_breakpoint (struct lwp_info *event_child) |
da6d8c04 | 873 | { |
0d62e5e8 DJ |
874 | CORE_ADDR stop_pc; |
875 | struct thread_info *saved_inferior; | |
876 | ||
877 | if (event_child->pending_is_breakpoint == 0) | |
878 | return 0; | |
879 | ||
880 | if (debug_threads) | |
54a0b537 | 881 | fprintf (stderr, "Checking for breakpoint in lwp %ld.\n", |
bd99dc85 | 882 | lwpid_of (event_child)); |
0d62e5e8 DJ |
883 | |
884 | saved_inferior = current_inferior; | |
54a0b537 | 885 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 DJ |
886 | |
887 | stop_pc = get_stop_pc (); | |
888 | ||
889 | /* If the PC has changed since we stopped, then we shouldn't do | |
890 | anything. This happens if, for instance, GDB handled the | |
891 | decr_pc_after_break subtraction itself. */ | |
892 | if (stop_pc != event_child->pending_stop_pc) | |
893 | { | |
894 | if (debug_threads) | |
ae13219e DJ |
895 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
896 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
897 | |
898 | event_child->pending_is_breakpoint = 0; | |
899 | current_inferior = saved_inferior; | |
900 | return 0; | |
901 | } | |
902 | ||
903 | /* If the breakpoint is still there, we will report hitting it. */ | |
904 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
905 | { | |
906 | if (debug_threads) | |
907 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
908 | current_inferior = saved_inferior; | |
909 | return 0; | |
910 | } | |
911 | ||
912 | if (debug_threads) | |
913 | fprintf (stderr, "Removed breakpoint.\n"); | |
914 | ||
915 | /* For decr_pc_after_break targets, here is where we perform the | |
916 | decrement. We go immediately from this function to resuming, | |
917 | and can not safely call get_stop_pc () again. */ | |
918 | if (the_low_target.set_pc != NULL) | |
47c0c975 DE |
919 | { |
920 | if (debug_threads) | |
921 | fprintf (stderr, "Set pc to 0x%lx\n", (long) stop_pc); | |
922 | (*the_low_target.set_pc) (stop_pc); | |
923 | } | |
0d62e5e8 DJ |
924 | |
925 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 926 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
927 | event_child->status_pending_p = 0; |
928 | event_child->status_pending = 0; | |
929 | ||
930 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
931 | return 1; |
932 | } | |
933 | ||
54a0b537 PA |
934 | /* Return 1 if this lwp has an interesting status pending. This |
935 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 936 | static int |
95954743 | 937 | status_pending_p (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 938 | { |
54a0b537 | 939 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 PA |
940 | ptid_t ptid = * (ptid_t *) arg; |
941 | ||
942 | /* Check if we're only interested in events from a specific process | |
943 | or its lwps. */ | |
944 | if (!ptid_equal (minus_one_ptid, ptid) | |
945 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
946 | return 0; | |
0d62e5e8 | 947 | |
bd99dc85 | 948 | if (lwp->status_pending_p && !lwp->suspended) |
54a0b537 | 949 | if (check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
950 | { |
951 | /* This thread was stopped at a breakpoint, and the breakpoint | |
952 | is now gone. We were told to continue (or step...) all threads, | |
953 | so GDB isn't trying to single-step past this breakpoint. | |
954 | So instead of reporting the old SIGTRAP, pretend we got to | |
955 | the breakpoint just after it was removed instead of just | |
956 | before; resume the process. */ | |
2acc282a | 957 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
0d62e5e8 DJ |
958 | return 0; |
959 | } | |
960 | ||
bd99dc85 | 961 | return (lwp->status_pending_p && !lwp->suspended); |
0d62e5e8 DJ |
962 | } |
963 | ||
95954743 PA |
964 | static int |
965 | same_lwp (struct inferior_list_entry *entry, void *data) | |
966 | { | |
967 | ptid_t ptid = *(ptid_t *) data; | |
968 | int lwp; | |
969 | ||
970 | if (ptid_get_lwp (ptid) != 0) | |
971 | lwp = ptid_get_lwp (ptid); | |
972 | else | |
973 | lwp = ptid_get_pid (ptid); | |
974 | ||
975 | if (ptid_get_lwp (entry->id) == lwp) | |
976 | return 1; | |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
981 | struct lwp_info * | |
982 | find_lwp_pid (ptid_t ptid) | |
983 | { | |
984 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
985 | } | |
986 | ||
bd99dc85 | 987 | static struct lwp_info * |
95954743 | 988 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 989 | { |
0d62e5e8 | 990 | int ret; |
95954743 | 991 | int to_wait_for = -1; |
bd99dc85 | 992 | struct lwp_info *child = NULL; |
0d62e5e8 | 993 | |
bd99dc85 | 994 | if (debug_threads) |
95954743 PA |
995 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
996 | ||
997 | if (ptid_equal (ptid, minus_one_ptid)) | |
998 | to_wait_for = -1; /* any child */ | |
999 | else | |
1000 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1001 | |
bd99dc85 | 1002 | options |= __WALL; |
0d62e5e8 | 1003 | |
bd99dc85 | 1004 | retry: |
0d62e5e8 | 1005 | |
bd99dc85 PA |
1006 | ret = my_waitpid (to_wait_for, wstatp, options); |
1007 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1008 | return NULL; | |
1009 | else if (ret == -1) | |
1010 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1011 | |
1012 | if (debug_threads | |
1013 | && (!WIFSTOPPED (*wstatp) | |
1014 | || (WSTOPSIG (*wstatp) != 32 | |
1015 | && WSTOPSIG (*wstatp) != 33))) | |
1016 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1017 | ||
95954743 | 1018 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1019 | |
24a09b5f DJ |
1020 | /* If we didn't find a process, one of two things presumably happened: |
1021 | - A process we started and then detached from has exited. Ignore it. | |
1022 | - A process we are controlling has forked and the new child's stop | |
1023 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1024 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1025 | { |
1026 | add_pid_to_list (&stopped_pids, ret); | |
1027 | goto retry; | |
1028 | } | |
bd99dc85 | 1029 | else if (child == NULL) |
24a09b5f DJ |
1030 | goto retry; |
1031 | ||
bd99dc85 PA |
1032 | child->stopped = 1; |
1033 | child->pending_is_breakpoint = 0; | |
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 | ||
0d62e5e8 | 1050 | if (debug_threads |
47c0c975 DE |
1051 | && WIFSTOPPED (*wstatp) |
1052 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1053 | { |
896c7fbb | 1054 | struct thread_info *saved_inferior = current_inferior; |
47c0c975 DE |
1055 | CORE_ADDR pc; |
1056 | ||
0d62e5e8 | 1057 | current_inferior = (struct thread_info *) |
95954743 | 1058 | find_inferior_id (&all_threads, child->head.id); |
47c0c975 DE |
1059 | pc = (*the_low_target.get_pc) (); |
1060 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); | |
896c7fbb | 1061 | current_inferior = saved_inferior; |
0d62e5e8 | 1062 | } |
bd99dc85 PA |
1063 | |
1064 | return child; | |
0d62e5e8 | 1065 | } |
611cb4a5 | 1066 | |
bd99dc85 PA |
1067 | /* Wait for an event from child PID. If PID is -1, wait for any |
1068 | child. Store the stop status through the status pointer WSTAT. | |
1069 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1070 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1071 | the stopped child otherwise. */ | |
1072 | ||
0d62e5e8 | 1073 | static int |
95954743 | 1074 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 DJ |
1075 | { |
1076 | CORE_ADDR stop_pc; | |
bd99dc85 | 1077 | struct lwp_info *event_child = NULL; |
b65d95c5 | 1078 | int bp_status; |
bd99dc85 | 1079 | struct lwp_info *requested_child = NULL; |
0d62e5e8 | 1080 | |
95954743 | 1081 | /* Check for a lwp with a pending status. */ |
0d62e5e8 DJ |
1082 | /* It is possible that the user changed the pending task's registers since |
1083 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 1084 | (in check_removed_breakpoint); signals should be reported anyway. */ |
bd99dc85 | 1085 | |
95954743 PA |
1086 | if (ptid_equal (ptid, minus_one_ptid) |
1087 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1088 | { |
54a0b537 | 1089 | event_child = (struct lwp_info *) |
95954743 | 1090 | find_inferior (&all_lwps, status_pending_p, &ptid); |
0d62e5e8 | 1091 | if (debug_threads && event_child) |
bd99dc85 | 1092 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1093 | } |
1094 | else | |
1095 | { | |
95954743 | 1096 | requested_child = find_lwp_pid (ptid); |
bd99dc85 PA |
1097 | if (requested_child->status_pending_p |
1098 | && !check_removed_breakpoint (requested_child)) | |
1099 | event_child = requested_child; | |
0d62e5e8 | 1100 | } |
611cb4a5 | 1101 | |
0d62e5e8 DJ |
1102 | if (event_child != NULL) |
1103 | { | |
bd99dc85 PA |
1104 | if (debug_threads) |
1105 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1106 | lwpid_of (event_child), event_child->status_pending); | |
1107 | *wstat = event_child->status_pending; | |
1108 | event_child->status_pending_p = 0; | |
1109 | event_child->status_pending = 0; | |
1110 | current_inferior = get_lwp_thread (event_child); | |
1111 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1112 | } |
1113 | ||
1114 | /* We only enter this loop if no process has a pending wait status. Thus | |
1115 | any action taken in response to a wait status inside this loop is | |
1116 | responding as soon as we detect the status, not after any pending | |
1117 | events. */ | |
1118 | while (1) | |
1119 | { | |
95954743 | 1120 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1121 | |
bd99dc85 PA |
1122 | if ((options & WNOHANG) && event_child == NULL) |
1123 | return 0; | |
0d62e5e8 DJ |
1124 | |
1125 | if (event_child == NULL) | |
1126 | error ("event from unknown child"); | |
611cb4a5 | 1127 | |
bd99dc85 | 1128 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1129 | |
89be2091 | 1130 | /* Check for thread exit. */ |
bd99dc85 | 1131 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1132 | { |
89be2091 | 1133 | if (debug_threads) |
95954743 | 1134 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1135 | |
1136 | /* If the last thread is exiting, just return. */ | |
95954743 | 1137 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1138 | { |
1139 | if (debug_threads) | |
95954743 PA |
1140 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1141 | lwpid_of (event_child)); | |
bd99dc85 PA |
1142 | return lwpid_of (event_child); |
1143 | } | |
89be2091 | 1144 | |
bd99dc85 | 1145 | delete_lwp (event_child); |
89be2091 | 1146 | |
bd99dc85 PA |
1147 | if (!non_stop) |
1148 | { | |
1149 | current_inferior = (struct thread_info *) all_threads.head; | |
1150 | if (debug_threads) | |
1151 | fprintf (stderr, "Current inferior is now %ld\n", | |
1152 | lwpid_of (get_thread_lwp (current_inferior))); | |
1153 | } | |
1154 | else | |
1155 | { | |
1156 | current_inferior = NULL; | |
1157 | if (debug_threads) | |
1158 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1159 | } | |
89be2091 DJ |
1160 | |
1161 | /* If we were waiting for this particular child to do something... | |
1162 | well, it did something. */ | |
bd99dc85 | 1163 | if (requested_child != NULL) |
95954743 | 1164 | return lwpid_of (event_child); |
89be2091 DJ |
1165 | |
1166 | /* Wait for a more interesting event. */ | |
1167 | continue; | |
1168 | } | |
1169 | ||
a6dbe5df PA |
1170 | if (event_child->must_set_ptrace_flags) |
1171 | { | |
1172 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
1173 | 0, PTRACE_O_TRACECLONE); | |
1174 | event_child->must_set_ptrace_flags = 0; | |
1175 | } | |
1176 | ||
bd99dc85 PA |
1177 | if (WIFSTOPPED (*wstat) |
1178 | && WSTOPSIG (*wstat) == SIGSTOP | |
89be2091 DJ |
1179 | && event_child->stop_expected) |
1180 | { | |
1181 | if (debug_threads) | |
1182 | fprintf (stderr, "Expected stop.\n"); | |
1183 | event_child->stop_expected = 0; | |
2acc282a | 1184 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
89be2091 DJ |
1185 | continue; |
1186 | } | |
1187 | ||
bd99dc85 PA |
1188 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1189 | && *wstat >> 16 != 0) | |
24a09b5f | 1190 | { |
bd99dc85 | 1191 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1192 | continue; |
1193 | } | |
1194 | ||
89be2091 DJ |
1195 | /* If GDB is not interested in this signal, don't stop other |
1196 | threads, and don't report it to GDB. Just resume the | |
1197 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1198 | signals as well as any that GDB specifically requested we |
1199 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1200 | and do not ignore signals when stepping - they may require | |
1201 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1202 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1203 | thread library? */ | |
bd99dc85 | 1204 | if (WIFSTOPPED (*wstat) |
69f223ed | 1205 | && !event_child->stepping |
24a09b5f DJ |
1206 | && ( |
1207 | #ifdef USE_THREAD_DB | |
cdbfd419 | 1208 | (current_process ()->private->thread_db != NULL |
bd99dc85 PA |
1209 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1210 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1211 | || |
1212 | #endif | |
bd99dc85 PA |
1213 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
1214 | && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
1215 | { |
1216 | siginfo_t info, *info_p; | |
1217 | ||
1218 | if (debug_threads) | |
24a09b5f | 1219 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1220 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1221 | |
bd99dc85 | 1222 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1223 | info_p = &info; |
1224 | else | |
1225 | info_p = NULL; | |
2acc282a | 1226 | linux_resume_one_lwp (event_child, |
54a0b537 | 1227 | event_child->stepping, |
bd99dc85 | 1228 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1229 | continue; |
0d62e5e8 | 1230 | } |
611cb4a5 | 1231 | |
0d62e5e8 DJ |
1232 | /* If this event was not handled above, and is not a SIGTRAP, report |
1233 | it. */ | |
bd99dc85 PA |
1234 | if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP) |
1235 | return lwpid_of (event_child); | |
611cb4a5 | 1236 | |
0d62e5e8 DJ |
1237 | /* If this target does not support breakpoints, we simply report the |
1238 | SIGTRAP; it's of no concern to us. */ | |
1239 | if (the_low_target.get_pc == NULL) | |
bd99dc85 | 1240 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1241 | |
1242 | stop_pc = get_stop_pc (); | |
1243 | ||
1244 | /* bp_reinsert will only be set if we were single-stepping. | |
1245 | Notice that we will resume the process after hitting | |
1246 | a gdbserver breakpoint; single-stepping to/over one | |
1247 | is not supported (yet). */ | |
1248 | if (event_child->bp_reinsert != 0) | |
1249 | { | |
1250 | if (debug_threads) | |
1251 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
1252 | reinsert_breakpoint (event_child->bp_reinsert); | |
1253 | event_child->bp_reinsert = 0; | |
1254 | ||
1255 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
2acc282a | 1256 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
0d62e5e8 DJ |
1257 | continue; |
1258 | } | |
1259 | ||
b65d95c5 | 1260 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 1261 | |
b65d95c5 | 1262 | if (bp_status != 0) |
0d62e5e8 | 1263 | { |
b65d95c5 DJ |
1264 | if (debug_threads) |
1265 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1266 | ||
0d62e5e8 | 1267 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 1268 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
1269 | adjustment for us at the appropriate time. */ |
1270 | event_child->pending_is_breakpoint = 1; | |
1271 | event_child->pending_stop_pc = stop_pc; | |
1272 | ||
b65d95c5 | 1273 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
1274 | loop instead of simply replacing the breakpoint right away, |
1275 | in order to not lose signals sent to the thread that hit the | |
1276 | breakpoint. Unfortunately this increases the window where another | |
1277 | thread could sneak past the removed breakpoint. For the current | |
1278 | use of server-side breakpoints (thread creation) this is | |
1279 | acceptable; but it needs to be considered before this breakpoint | |
1280 | mechanism can be used in more general ways. For some breakpoints | |
1281 | it may be necessary to stop all other threads, but that should | |
1282 | be avoided where possible. | |
1283 | ||
1284 | If breakpoint_reinsert_addr is NULL, that means that we can | |
1285 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
1286 | mark it for reinsertion, and single-step. | |
1287 | ||
1288 | Otherwise, call the target function to figure out where we need | |
1289 | our temporary breakpoint, create it, and continue executing this | |
1290 | process. */ | |
bd99dc85 PA |
1291 | |
1292 | /* NOTE: we're lifting breakpoints in non-stop mode. This | |
1293 | is currently only used for thread event breakpoints, so | |
1294 | it isn't that bad as long as we have PTRACE_EVENT_CLONE | |
1295 | events. */ | |
b65d95c5 DJ |
1296 | if (bp_status == 2) |
1297 | /* No need to reinsert. */ | |
2acc282a | 1298 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
b65d95c5 | 1299 | else if (the_low_target.breakpoint_reinsert_addr == NULL) |
0d62e5e8 DJ |
1300 | { |
1301 | event_child->bp_reinsert = stop_pc; | |
1302 | uninsert_breakpoint (stop_pc); | |
2acc282a | 1303 | linux_resume_one_lwp (event_child, 1, 0, NULL); |
0d62e5e8 DJ |
1304 | } |
1305 | else | |
1306 | { | |
1307 | reinsert_breakpoint_by_bp | |
1308 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
2acc282a | 1309 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
611cb4a5 | 1310 | } |
0d62e5e8 DJ |
1311 | |
1312 | continue; | |
1313 | } | |
1314 | ||
b65d95c5 DJ |
1315 | if (debug_threads) |
1316 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
1317 | ||
0d62e5e8 | 1318 | /* If we were single-stepping, we definitely want to report the |
c35fafde PA |
1319 | SIGTRAP. Although the single-step operation has completed, |
1320 | do not clear clear the stepping flag yet; we need to check it | |
1321 | in wait_for_sigstop. */ | |
0d62e5e8 | 1322 | if (event_child->stepping) |
bd99dc85 | 1323 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1324 | |
1325 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
1326 | Check if it is a breakpoint, and if so mark the process information | |
1327 | accordingly. This will handle both the necessary fiddling with the | |
1328 | PC on decr_pc_after_break targets and suppressing extra threads | |
1329 | hitting a breakpoint if two hit it at once and then GDB removes it | |
1330 | after the first is reported. Arguably it would be better to report | |
1331 | multiple threads hitting breakpoints simultaneously, but the current | |
1332 | remote protocol does not allow this. */ | |
1333 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
1334 | { | |
1335 | event_child->pending_is_breakpoint = 1; | |
1336 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
1337 | } |
1338 | ||
bd99dc85 | 1339 | return lwpid_of (event_child); |
611cb4a5 | 1340 | } |
0d62e5e8 | 1341 | |
611cb4a5 DJ |
1342 | /* NOTREACHED */ |
1343 | return 0; | |
1344 | } | |
1345 | ||
95954743 PA |
1346 | static int |
1347 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1348 | { | |
1349 | ptid_t wait_ptid; | |
1350 | ||
1351 | if (ptid_is_pid (ptid)) | |
1352 | { | |
1353 | /* A request to wait for a specific tgid. This is not possible | |
1354 | with waitpid, so instead, we wait for any child, and leave | |
1355 | children we're not interested in right now with a pending | |
1356 | status to report later. */ | |
1357 | wait_ptid = minus_one_ptid; | |
1358 | } | |
1359 | else | |
1360 | wait_ptid = ptid; | |
1361 | ||
1362 | while (1) | |
1363 | { | |
1364 | int event_pid; | |
1365 | ||
1366 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1367 | ||
1368 | if (event_pid > 0 | |
1369 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1370 | { | |
1371 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1372 | ||
1373 | if (! WIFSTOPPED (*wstat)) | |
1374 | mark_lwp_dead (event_child, *wstat); | |
1375 | else | |
1376 | { | |
1377 | event_child->status_pending_p = 1; | |
1378 | event_child->status_pending = *wstat; | |
1379 | } | |
1380 | } | |
1381 | else | |
1382 | return event_pid; | |
1383 | } | |
1384 | } | |
1385 | ||
0d62e5e8 | 1386 | /* Wait for process, returns status. */ |
da6d8c04 | 1387 | |
95954743 PA |
1388 | static ptid_t |
1389 | linux_wait_1 (ptid_t ptid, | |
1390 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1391 | { |
e5f1222d | 1392 | int w; |
bd99dc85 PA |
1393 | struct thread_info *thread = NULL; |
1394 | struct lwp_info *lwp = NULL; | |
1395 | int options; | |
bd99dc85 PA |
1396 | int pid; |
1397 | ||
1398 | /* Translate generic target options into linux options. */ | |
1399 | options = __WALL; | |
1400 | if (target_options & TARGET_WNOHANG) | |
1401 | options |= WNOHANG; | |
0d62e5e8 DJ |
1402 | |
1403 | retry: | |
bd99dc85 PA |
1404 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1405 | ||
0d62e5e8 DJ |
1406 | /* If we were only supposed to resume one thread, only wait for |
1407 | that thread - if it's still alive. If it died, however - which | |
1408 | can happen if we're coming from the thread death case below - | |
1409 | then we need to make sure we restart the other threads. We could | |
1410 | pick a thread at random or restart all; restarting all is less | |
1411 | arbitrary. */ | |
95954743 PA |
1412 | if (!non_stop |
1413 | && !ptid_equal (cont_thread, null_ptid) | |
1414 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1415 | { |
bd99dc85 PA |
1416 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1417 | cont_thread); | |
0d62e5e8 DJ |
1418 | |
1419 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1420 | if (thread == NULL) |
64386c31 DJ |
1421 | { |
1422 | struct thread_resume resume_info; | |
95954743 | 1423 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1424 | resume_info.kind = resume_continue; |
1425 | resume_info.sig = 0; | |
2bd7c093 | 1426 | linux_resume (&resume_info, 1); |
64386c31 | 1427 | } |
bd99dc85 | 1428 | else |
95954743 | 1429 | ptid = cont_thread; |
0d62e5e8 | 1430 | } |
da6d8c04 | 1431 | |
95954743 | 1432 | pid = linux_wait_for_event (ptid, &w, options); |
bd99dc85 | 1433 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1434 | return null_ptid; |
bd99dc85 PA |
1435 | |
1436 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1437 | |
0d62e5e8 DJ |
1438 | /* If we are waiting for a particular child, and it exited, |
1439 | linux_wait_for_event will return its exit status. Similarly if | |
1440 | the last child exited. If this is not the last child, however, | |
1441 | do not report it as exited until there is a 'thread exited' response | |
1442 | available in the remote protocol. Instead, just wait for another event. | |
1443 | This should be safe, because if the thread crashed we will already | |
1444 | have reported the termination signal to GDB; that should stop any | |
1445 | in-progress stepping operations, etc. | |
1446 | ||
1447 | Report the exit status of the last thread to exit. This matches | |
1448 | LinuxThreads' behavior. */ | |
1449 | ||
95954743 | 1450 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1451 | { |
bd99dc85 | 1452 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1453 | { |
95954743 PA |
1454 | int pid = pid_of (lwp); |
1455 | struct process_info *process = find_process_pid (pid); | |
5b1c542e | 1456 | |
ca5c370d PA |
1457 | #ifdef USE_THREAD_DB |
1458 | thread_db_free (process, 0); | |
1459 | #endif | |
bd99dc85 | 1460 | delete_lwp (lwp); |
ca5c370d | 1461 | linux_remove_process (process); |
5b1c542e | 1462 | |
bd99dc85 | 1463 | current_inferior = NULL; |
5b1c542e | 1464 | |
bd99dc85 PA |
1465 | if (WIFEXITED (w)) |
1466 | { | |
1467 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1468 | ourstatus->value.integer = WEXITSTATUS (w); | |
1469 | ||
1470 | if (debug_threads) | |
1471 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1472 | } | |
1473 | else | |
1474 | { | |
1475 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1476 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1477 | ||
1478 | if (debug_threads) | |
1479 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1480 | ||
1481 | } | |
5b1c542e | 1482 | |
95954743 | 1483 | return pid_to_ptid (pid); |
0d62e5e8 | 1484 | } |
da6d8c04 | 1485 | } |
0d62e5e8 | 1486 | else |
da6d8c04 | 1487 | { |
0d62e5e8 DJ |
1488 | if (!WIFSTOPPED (w)) |
1489 | goto retry; | |
da6d8c04 DJ |
1490 | } |
1491 | ||
bd99dc85 PA |
1492 | /* In all-stop, stop all threads. Be careful to only do this if |
1493 | we're about to report an event to GDB. */ | |
1494 | if (!non_stop) | |
1495 | stop_all_lwps (); | |
1496 | ||
5b1c542e | 1497 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1498 | |
bd99dc85 PA |
1499 | if (lwp->suspended && WSTOPSIG (w) == SIGSTOP) |
1500 | { | |
1501 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1502 | and it stopped cleanly, so report as SIG0. The use of | |
1503 | SIGSTOP is an implementation detail. */ | |
1504 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1505 | } | |
1506 | else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP) | |
1507 | { | |
1508 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1509 | but, it stopped for other reasons. Set stop_expected so the | |
1510 | pending SIGSTOP is ignored and the LWP is resumed. */ | |
1511 | lwp->stop_expected = 1; | |
1512 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1513 | } | |
1514 | else | |
1515 | { | |
1516 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1517 | } | |
1518 | ||
1519 | if (debug_threads) | |
95954743 PA |
1520 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
1521 | target_pid_to_str (lwp->head.id), | |
bd99dc85 PA |
1522 | ourstatus->kind, |
1523 | ourstatus->value.sig); | |
1524 | ||
95954743 | 1525 | return lwp->head.id; |
bd99dc85 PA |
1526 | } |
1527 | ||
1528 | /* Get rid of any pending event in the pipe. */ | |
1529 | static void | |
1530 | async_file_flush (void) | |
1531 | { | |
1532 | int ret; | |
1533 | char buf; | |
1534 | ||
1535 | do | |
1536 | ret = read (linux_event_pipe[0], &buf, 1); | |
1537 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1538 | } | |
1539 | ||
1540 | /* Put something in the pipe, so the event loop wakes up. */ | |
1541 | static void | |
1542 | async_file_mark (void) | |
1543 | { | |
1544 | int ret; | |
1545 | ||
1546 | async_file_flush (); | |
1547 | ||
1548 | do | |
1549 | ret = write (linux_event_pipe[1], "+", 1); | |
1550 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1551 | ||
1552 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1553 | be awakened anyway. */ | |
1554 | } | |
1555 | ||
95954743 PA |
1556 | static ptid_t |
1557 | linux_wait (ptid_t ptid, | |
1558 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1559 | { |
95954743 | 1560 | ptid_t event_ptid; |
bd99dc85 PA |
1561 | |
1562 | if (debug_threads) | |
95954743 | 1563 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1564 | |
1565 | /* Flush the async file first. */ | |
1566 | if (target_is_async_p ()) | |
1567 | async_file_flush (); | |
1568 | ||
95954743 | 1569 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1570 | |
1571 | /* If at least one stop was reported, there may be more. A single | |
1572 | SIGCHLD can signal more than one child stop. */ | |
1573 | if (target_is_async_p () | |
1574 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1575 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1576 | async_file_mark (); |
1577 | ||
1578 | return event_ptid; | |
da6d8c04 DJ |
1579 | } |
1580 | ||
c5f62d5f | 1581 | /* Send a signal to an LWP. */ |
fd500816 DJ |
1582 | |
1583 | static int | |
a1928bad | 1584 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 1585 | { |
c5f62d5f DE |
1586 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1587 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 1588 | |
c5f62d5f DE |
1589 | #ifdef __NR_tkill |
1590 | { | |
1591 | static int tkill_failed; | |
fd500816 | 1592 | |
c5f62d5f DE |
1593 | if (!tkill_failed) |
1594 | { | |
1595 | int ret; | |
1596 | ||
1597 | errno = 0; | |
1598 | ret = syscall (__NR_tkill, lwpid, signo); | |
1599 | if (errno != ENOSYS) | |
1600 | return ret; | |
1601 | tkill_failed = 1; | |
1602 | } | |
1603 | } | |
fd500816 DJ |
1604 | #endif |
1605 | ||
1606 | return kill (lwpid, signo); | |
1607 | } | |
1608 | ||
0d62e5e8 DJ |
1609 | static void |
1610 | send_sigstop (struct inferior_list_entry *entry) | |
1611 | { | |
54a0b537 | 1612 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1613 | int pid; |
0d62e5e8 | 1614 | |
54a0b537 | 1615 | if (lwp->stopped) |
0d62e5e8 DJ |
1616 | return; |
1617 | ||
bd99dc85 PA |
1618 | pid = lwpid_of (lwp); |
1619 | ||
0d62e5e8 DJ |
1620 | /* If we already have a pending stop signal for this process, don't |
1621 | send another. */ | |
54a0b537 | 1622 | if (lwp->stop_expected) |
0d62e5e8 | 1623 | { |
ae13219e | 1624 | if (debug_threads) |
bd99dc85 | 1625 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e DJ |
1626 | |
1627 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1628 | will receive the SIGSTOP event (instead of silently resuming and | |
1629 | waiting again). It'll be reset below. */ | |
54a0b537 | 1630 | lwp->stop_expected = 0; |
0d62e5e8 DJ |
1631 | return; |
1632 | } | |
1633 | ||
1634 | if (debug_threads) | |
bd99dc85 | 1635 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1636 | |
bd99dc85 | 1637 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1638 | } |
1639 | ||
95954743 PA |
1640 | static void |
1641 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
1642 | { | |
1643 | /* It's dead, really. */ | |
1644 | lwp->dead = 1; | |
1645 | ||
1646 | /* Store the exit status for later. */ | |
1647 | lwp->status_pending_p = 1; | |
1648 | lwp->status_pending = wstat; | |
1649 | ||
1650 | /* So that check_removed_breakpoint doesn't try to figure out if | |
1651 | this is stopped at a breakpoint. */ | |
1652 | lwp->pending_is_breakpoint = 0; | |
1653 | ||
1654 | /* Prevent trying to stop it. */ | |
1655 | lwp->stopped = 1; | |
1656 | ||
1657 | /* No further stops are expected from a dead lwp. */ | |
1658 | lwp->stop_expected = 0; | |
1659 | } | |
1660 | ||
0d62e5e8 DJ |
1661 | static void |
1662 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1663 | { | |
54a0b537 | 1664 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1665 | struct thread_info *saved_inferior; |
a1928bad | 1666 | int wstat; |
95954743 PA |
1667 | ptid_t saved_tid; |
1668 | ptid_t ptid; | |
0d62e5e8 | 1669 | |
54a0b537 | 1670 | if (lwp->stopped) |
0d62e5e8 DJ |
1671 | return; |
1672 | ||
1673 | saved_inferior = current_inferior; | |
bd99dc85 PA |
1674 | if (saved_inferior != NULL) |
1675 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1676 | else | |
95954743 | 1677 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 1678 | |
95954743 | 1679 | ptid = lwp->head.id; |
bd99dc85 PA |
1680 | |
1681 | linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
1682 | |
1683 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1684 | and record the pending SIGSTOP. If the process exited, just | |
1685 | return. */ | |
1686 | if (WIFSTOPPED (wstat) | |
1687 | && WSTOPSIG (wstat) != SIGSTOP) | |
1688 | { | |
1689 | if (debug_threads) | |
24a09b5f | 1690 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
bd99dc85 | 1691 | lwpid_of (lwp), wstat); |
c35fafde PA |
1692 | |
1693 | /* Do not leave a pending single-step finish to be reported to | |
1694 | the client. The client will give us a new action for this | |
1695 | thread, possibly a continue request --- otherwise, the client | |
1696 | would consider this pending SIGTRAP reported later a spurious | |
1697 | signal. */ | |
1698 | if (WSTOPSIG (wstat) == SIGTRAP | |
1699 | && lwp->stepping | |
1700 | && !linux_stopped_by_watchpoint ()) | |
1701 | { | |
1702 | if (debug_threads) | |
1703 | fprintf (stderr, " single-step SIGTRAP ignored\n"); | |
1704 | } | |
1705 | else | |
1706 | { | |
1707 | lwp->status_pending_p = 1; | |
1708 | lwp->status_pending = wstat; | |
1709 | } | |
54a0b537 | 1710 | lwp->stop_expected = 1; |
0d62e5e8 | 1711 | } |
95954743 PA |
1712 | else if (!WIFSTOPPED (wstat)) |
1713 | { | |
1714 | if (debug_threads) | |
1715 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
1716 | lwpid_of (lwp)); | |
1717 | ||
1718 | /* Leave this status pending for the next time we're able to | |
1719 | report it. In the mean time, we'll report this lwp as dead | |
1720 | to GDB, so GDB doesn't try to read registers and memory from | |
1721 | it. */ | |
1722 | mark_lwp_dead (lwp, wstat); | |
1723 | } | |
0d62e5e8 | 1724 | |
bd99dc85 | 1725 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
1726 | current_inferior = saved_inferior; |
1727 | else | |
1728 | { | |
1729 | if (debug_threads) | |
1730 | fprintf (stderr, "Previously current thread died.\n"); | |
1731 | ||
bd99dc85 PA |
1732 | if (non_stop) |
1733 | { | |
1734 | /* We can't change the current inferior behind GDB's back, | |
1735 | otherwise, a subsequent command may apply to the wrong | |
1736 | process. */ | |
1737 | current_inferior = NULL; | |
1738 | } | |
1739 | else | |
1740 | { | |
1741 | /* Set a valid thread as current. */ | |
1742 | set_desired_inferior (0); | |
1743 | } | |
0d62e5e8 DJ |
1744 | } |
1745 | } | |
1746 | ||
1747 | static void | |
54a0b537 | 1748 | stop_all_lwps (void) |
0d62e5e8 DJ |
1749 | { |
1750 | stopping_threads = 1; | |
54a0b537 PA |
1751 | for_each_inferior (&all_lwps, send_sigstop); |
1752 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
1753 | stopping_threads = 0; |
1754 | } | |
1755 | ||
da6d8c04 DJ |
1756 | /* Resume execution of the inferior process. |
1757 | If STEP is nonzero, single-step it. | |
1758 | If SIGNAL is nonzero, give it that signal. */ | |
1759 | ||
ce3a066d | 1760 | static void |
2acc282a | 1761 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 1762 | int step, int signal, siginfo_t *info) |
da6d8c04 | 1763 | { |
0d62e5e8 DJ |
1764 | struct thread_info *saved_inferior; |
1765 | ||
54a0b537 | 1766 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
1767 | return; |
1768 | ||
1769 | /* If we have pending signals or status, and a new signal, enqueue the | |
1770 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1771 | breakpoint; it will be picked up again below. */ | |
1772 | if (signal != 0 | |
54a0b537 PA |
1773 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
1774 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
1775 | { |
1776 | struct pending_signals *p_sig; | |
bca929d3 | 1777 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 1778 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 1779 | p_sig->signal = signal; |
32ca6d61 DJ |
1780 | if (info == NULL) |
1781 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1782 | else | |
1783 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 1784 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
1785 | } |
1786 | ||
54a0b537 | 1787 | if (lwp->status_pending_p && !check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
1788 | return; |
1789 | ||
1790 | saved_inferior = current_inferior; | |
54a0b537 | 1791 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
1792 | |
1793 | if (debug_threads) | |
1b3f6016 | 1794 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 1795 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 1796 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
1797 | |
1798 | /* This bit needs some thinking about. If we get a signal that | |
1799 | we must report while a single-step reinsert is still pending, | |
1800 | we often end up resuming the thread. It might be better to | |
1801 | (ew) allow a stack of pending events; then we could be sure that | |
1802 | the reinsert happened right away and not lose any signals. | |
1803 | ||
1804 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 1805 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
1806 | complete correctness, so it won't solve that problem. It may be |
1807 | worthwhile just to solve this one, however. */ | |
54a0b537 | 1808 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
1809 | { |
1810 | if (debug_threads) | |
54a0b537 | 1811 | fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert); |
0d62e5e8 DJ |
1812 | if (step == 0) |
1813 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1814 | step = 1; | |
1815 | ||
1816 | /* Postpone any pending signal. It was enqueued above. */ | |
1817 | signal = 0; | |
1818 | } | |
1819 | ||
54a0b537 | 1820 | check_removed_breakpoint (lwp); |
0d62e5e8 | 1821 | |
aa691b87 | 1822 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 1823 | { |
47c0c975 DE |
1824 | CORE_ADDR pc = (*the_low_target.get_pc) (); |
1825 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); | |
0d62e5e8 DJ |
1826 | } |
1827 | ||
1828 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1829 | a breakpoint. */ | |
54a0b537 | 1830 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
1831 | { |
1832 | struct pending_signals **p_sig; | |
1833 | ||
54a0b537 | 1834 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
1835 | while ((*p_sig)->prev != NULL) |
1836 | p_sig = &(*p_sig)->prev; | |
1837 | ||
1838 | signal = (*p_sig)->signal; | |
32ca6d61 | 1839 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 1840 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 1841 | |
0d62e5e8 DJ |
1842 | free (*p_sig); |
1843 | *p_sig = NULL; | |
1844 | } | |
1845 | ||
aa5ca48f DE |
1846 | if (the_low_target.prepare_to_resume != NULL) |
1847 | the_low_target.prepare_to_resume (lwp); | |
1848 | ||
0d62e5e8 | 1849 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 1850 | get_lwp_thread (lwp)); |
da6d8c04 | 1851 | errno = 0; |
54a0b537 PA |
1852 | lwp->stopped = 0; |
1853 | lwp->stepping = step; | |
bd99dc85 | 1854 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal); |
0d62e5e8 DJ |
1855 | |
1856 | current_inferior = saved_inferior; | |
da6d8c04 | 1857 | if (errno) |
3221518c UW |
1858 | { |
1859 | /* ESRCH from ptrace either means that the thread was already | |
1860 | running (an error) or that it is gone (a race condition). If | |
1861 | it's gone, we will get a notification the next time we wait, | |
1862 | so we can ignore the error. We could differentiate these | |
1863 | two, but it's tricky without waiting; the thread still exists | |
1864 | as a zombie, so sending it signal 0 would succeed. So just | |
1865 | ignore ESRCH. */ | |
1866 | if (errno == ESRCH) | |
1867 | return; | |
1868 | ||
1869 | perror_with_name ("ptrace"); | |
1870 | } | |
da6d8c04 DJ |
1871 | } |
1872 | ||
2bd7c093 PA |
1873 | struct thread_resume_array |
1874 | { | |
1875 | struct thread_resume *resume; | |
1876 | size_t n; | |
1877 | }; | |
64386c31 DJ |
1878 | |
1879 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1880 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1881 | resume request. | |
1882 | ||
1883 | This algorithm is O(threads * resume elements), but resume elements | |
1884 | is small (and will remain small at least until GDB supports thread | |
1885 | suspension). */ | |
2bd7c093 PA |
1886 | static int |
1887 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 1888 | { |
54a0b537 | 1889 | struct lwp_info *lwp; |
64386c31 | 1890 | struct thread_info *thread; |
5544ad89 | 1891 | int ndx; |
2bd7c093 | 1892 | struct thread_resume_array *r; |
64386c31 DJ |
1893 | |
1894 | thread = (struct thread_info *) entry; | |
54a0b537 | 1895 | lwp = get_thread_lwp (thread); |
2bd7c093 | 1896 | r = arg; |
64386c31 | 1897 | |
2bd7c093 | 1898 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
1899 | { |
1900 | ptid_t ptid = r->resume[ndx].thread; | |
1901 | if (ptid_equal (ptid, minus_one_ptid) | |
1902 | || ptid_equal (ptid, entry->id) | |
1903 | || (ptid_is_pid (ptid) | |
1904 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
1905 | || (ptid_get_lwp (ptid) == -1 | |
1906 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
1907 | { | |
1908 | lwp->resume = &r->resume[ndx]; | |
1909 | return 0; | |
1910 | } | |
1911 | } | |
2bd7c093 PA |
1912 | |
1913 | /* No resume action for this thread. */ | |
1914 | lwp->resume = NULL; | |
64386c31 | 1915 | |
2bd7c093 | 1916 | return 0; |
5544ad89 DJ |
1917 | } |
1918 | ||
5544ad89 | 1919 | |
bd99dc85 PA |
1920 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
1921 | static int | |
1922 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 1923 | { |
bd99dc85 | 1924 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 1925 | |
bd99dc85 PA |
1926 | /* LWPs which will not be resumed are not interesting, because |
1927 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 1928 | if (lwp->resume == NULL) |
bd99dc85 | 1929 | return 0; |
64386c31 | 1930 | |
bd99dc85 PA |
1931 | /* If this thread has a removed breakpoint, we won't have any |
1932 | events to report later, so check now. check_removed_breakpoint | |
1933 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1934 | for any thread that we are not otherwise going to resume - this | |
1935 | lets us preserve stopped status when two threads hit a breakpoint. | |
1936 | GDB removes the breakpoint to single-step a particular thread | |
1937 | past it, then re-inserts it and resumes all threads. We want | |
1938 | to report the second thread without resuming it in the interim. */ | |
1939 | if (lwp->status_pending_p) | |
1940 | check_removed_breakpoint (lwp); | |
5544ad89 | 1941 | |
bd99dc85 PA |
1942 | if (lwp->status_pending_p) |
1943 | * (int *) flag_p = 1; | |
c6ecbae5 | 1944 | |
bd99dc85 | 1945 | return 0; |
5544ad89 DJ |
1946 | } |
1947 | ||
1948 | /* This function is called once per thread. We check the thread's resume | |
1949 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 1950 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 1951 | |
bd99dc85 PA |
1952 | For threads which we aren't explicitly told otherwise, we preserve |
1953 | the stepping flag; this is used for stepping over gdbserver-placed | |
1954 | breakpoints. | |
1955 | ||
1956 | If pending_flags was set in any thread, we queue any needed | |
1957 | signals, since we won't actually resume. We already have a pending | |
1958 | event to report, so we don't need to preserve any step requests; | |
1959 | they should be re-issued if necessary. */ | |
1960 | ||
1961 | static int | |
1962 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 1963 | { |
54a0b537 | 1964 | struct lwp_info *lwp; |
5544ad89 | 1965 | struct thread_info *thread; |
bd99dc85 PA |
1966 | int step; |
1967 | int pending_flag = * (int *) arg; | |
5544ad89 DJ |
1968 | |
1969 | thread = (struct thread_info *) entry; | |
54a0b537 | 1970 | lwp = get_thread_lwp (thread); |
5544ad89 | 1971 | |
2bd7c093 | 1972 | if (lwp->resume == NULL) |
bd99dc85 | 1973 | return 0; |
5544ad89 | 1974 | |
bd99dc85 | 1975 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 1976 | { |
bd99dc85 PA |
1977 | if (debug_threads) |
1978 | fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp)); | |
1979 | ||
1980 | if (!lwp->stopped) | |
1981 | { | |
1982 | if (debug_threads) | |
95954743 | 1983 | fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
1984 | |
1985 | lwp->suspended = 1; | |
1986 | send_sigstop (&lwp->head); | |
1987 | } | |
1988 | else | |
1989 | { | |
1990 | if (debug_threads) | |
1991 | { | |
1992 | if (lwp->suspended) | |
1993 | fprintf (stderr, "already stopped/suspended LWP %ld\n", | |
1994 | lwpid_of (lwp)); | |
1995 | else | |
1996 | fprintf (stderr, "already stopped/not suspended LWP %ld\n", | |
1997 | lwpid_of (lwp)); | |
1998 | } | |
32ca6d61 | 1999 | |
bd99dc85 PA |
2000 | /* Make sure we leave the LWP suspended, so we don't try to |
2001 | resume it without GDB telling us to. FIXME: The LWP may | |
2002 | have been stopped in an internal event that was not meant | |
2003 | to be notified back to GDB (e.g., gdbserver breakpoint), | |
2004 | so we should be reporting a stop event in that case | |
2005 | too. */ | |
2006 | lwp->suspended = 1; | |
2007 | } | |
32ca6d61 | 2008 | |
bd99dc85 PA |
2009 | /* For stop requests, we're done. */ |
2010 | lwp->resume = NULL; | |
2011 | return 0; | |
5544ad89 | 2012 | } |
bd99dc85 PA |
2013 | else |
2014 | lwp->suspended = 0; | |
5544ad89 | 2015 | |
bd99dc85 PA |
2016 | /* If this thread which is about to be resumed has a pending status, |
2017 | then don't resume any threads - we can just report the pending | |
2018 | status. Make sure to queue any signals that would otherwise be | |
2019 | sent. In all-stop mode, we do this decision based on if *any* | |
2020 | thread has a pending status. */ | |
2021 | if (non_stop) | |
2022 | resume_status_pending_p (&lwp->head, &pending_flag); | |
5544ad89 | 2023 | |
bd99dc85 PA |
2024 | if (!pending_flag) |
2025 | { | |
2026 | if (debug_threads) | |
2027 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 2028 | |
95954743 | 2029 | if (ptid_equal (lwp->resume->thread, minus_one_ptid) |
bd99dc85 PA |
2030 | && lwp->stepping |
2031 | && lwp->pending_is_breakpoint) | |
2032 | step = 1; | |
2033 | else | |
2034 | step = (lwp->resume->kind == resume_step); | |
5544ad89 | 2035 | |
2acc282a | 2036 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
2037 | } |
2038 | else | |
2039 | { | |
2040 | if (debug_threads) | |
2041 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 2042 | |
bd99dc85 PA |
2043 | /* If we have a new signal, enqueue the signal. */ |
2044 | if (lwp->resume->sig != 0) | |
2045 | { | |
2046 | struct pending_signals *p_sig; | |
2047 | p_sig = xmalloc (sizeof (*p_sig)); | |
2048 | p_sig->prev = lwp->pending_signals; | |
2049 | p_sig->signal = lwp->resume->sig; | |
2050 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2051 | ||
2052 | /* If this is the same signal we were previously stopped by, | |
2053 | make sure to queue its siginfo. We can ignore the return | |
2054 | value of ptrace; if it fails, we'll skip | |
2055 | PTRACE_SETSIGINFO. */ | |
2056 | if (WIFSTOPPED (lwp->last_status) | |
2057 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
2058 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
2059 | ||
2060 | lwp->pending_signals = p_sig; | |
2061 | } | |
2062 | } | |
5544ad89 | 2063 | |
bd99dc85 | 2064 | lwp->resume = NULL; |
5544ad89 | 2065 | return 0; |
0d62e5e8 DJ |
2066 | } |
2067 | ||
2068 | static void | |
2bd7c093 | 2069 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 2070 | { |
5544ad89 | 2071 | int pending_flag; |
2bd7c093 | 2072 | struct thread_resume_array array = { resume_info, n }; |
c6ecbae5 | 2073 | |
2bd7c093 | 2074 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 DJ |
2075 | |
2076 | /* If there is a thread which would otherwise be resumed, which | |
2077 | has a pending status, then don't resume any threads - we can just | |
2078 | report the pending status. Make sure to queue any signals | |
bd99dc85 PA |
2079 | that would otherwise be sent. In non-stop mode, we'll apply this |
2080 | logic to each thread individually. */ | |
5544ad89 | 2081 | pending_flag = 0; |
bd99dc85 PA |
2082 | if (!non_stop) |
2083 | find_inferior (&all_lwps, resume_status_pending_p, &pending_flag); | |
5544ad89 DJ |
2084 | |
2085 | if (debug_threads) | |
2086 | { | |
2087 | if (pending_flag) | |
2088 | fprintf (stderr, "Not resuming, pending status\n"); | |
2089 | else | |
2090 | fprintf (stderr, "Resuming, no pending status\n"); | |
2091 | } | |
2092 | ||
bd99dc85 | 2093 | find_inferior (&all_threads, linux_resume_one_thread, &pending_flag); |
0d62e5e8 DJ |
2094 | } |
2095 | ||
2096 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
2097 | |
2098 | int | |
0a30fbc4 | 2099 | register_addr (int regnum) |
da6d8c04 DJ |
2100 | { |
2101 | int addr; | |
2102 | ||
2ec06d2e | 2103 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
2104 | error ("Invalid register number %d.", regnum); |
2105 | ||
2ec06d2e | 2106 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2107 | |
2108 | return addr; | |
2109 | } | |
2110 | ||
58caa3dc | 2111 | /* Fetch one register. */ |
da6d8c04 DJ |
2112 | static void |
2113 | fetch_register (int regno) | |
2114 | { | |
2115 | CORE_ADDR regaddr; | |
48d93c75 | 2116 | int i, size; |
0d62e5e8 | 2117 | char *buf; |
95954743 | 2118 | int pid; |
da6d8c04 | 2119 | |
2ec06d2e | 2120 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2121 | return; |
2ec06d2e | 2122 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2123 | return; |
da6d8c04 | 2124 | |
0a30fbc4 DJ |
2125 | regaddr = register_addr (regno); |
2126 | if (regaddr == -1) | |
2127 | return; | |
95954743 PA |
2128 | |
2129 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2130 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2131 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2132 | buf = alloca (size); |
2133 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2134 | { |
2135 | errno = 0; | |
0d62e5e8 | 2136 | *(PTRACE_XFER_TYPE *) (buf + i) = |
95954743 | 2137 | ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
da6d8c04 DJ |
2138 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2139 | if (errno != 0) | |
2140 | { | |
2141 | /* Warning, not error, in case we are attached; sometimes the | |
2142 | kernel doesn't let us at the registers. */ | |
2143 | char *err = strerror (errno); | |
2144 | char *msg = alloca (strlen (err) + 128); | |
2145 | sprintf (msg, "reading register %d: %s", regno, err); | |
2146 | error (msg); | |
2147 | goto error_exit; | |
2148 | } | |
2149 | } | |
ee1a7ae4 UW |
2150 | |
2151 | if (the_low_target.supply_ptrace_register) | |
2152 | the_low_target.supply_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2153 | else |
2154 | supply_register (regno, buf); | |
0d62e5e8 | 2155 | |
da6d8c04 DJ |
2156 | error_exit:; |
2157 | } | |
2158 | ||
2159 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
2160 | static void |
2161 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 | 2162 | { |
4463ce24 | 2163 | if (regno == -1) |
2ec06d2e | 2164 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
2165 | fetch_register (regno); |
2166 | else | |
2167 | fetch_register (regno); | |
2168 | } | |
2169 | ||
2170 | /* Store our register values back into the inferior. | |
2171 | If REGNO is -1, do this for all registers. | |
2172 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
2173 | static void |
2174 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
2175 | { |
2176 | CORE_ADDR regaddr; | |
48d93c75 | 2177 | int i, size; |
0d62e5e8 | 2178 | char *buf; |
55ac2b99 | 2179 | int pid; |
da6d8c04 DJ |
2180 | |
2181 | if (regno >= 0) | |
2182 | { | |
2ec06d2e | 2183 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2184 | return; |
2185 | ||
bc1e36ca | 2186 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2187 | return; |
2188 | ||
2189 | regaddr = register_addr (regno); | |
2190 | if (regaddr == -1) | |
da6d8c04 | 2191 | return; |
da6d8c04 | 2192 | errno = 0; |
48d93c75 UW |
2193 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2194 | & - sizeof (PTRACE_XFER_TYPE); | |
2195 | buf = alloca (size); | |
2196 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2197 | |
2198 | if (the_low_target.collect_ptrace_register) | |
2199 | the_low_target.collect_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2200 | else |
2201 | collect_register (regno, buf); | |
ee1a7ae4 | 2202 | |
95954743 | 2203 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2204 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2205 | { |
0a30fbc4 | 2206 | errno = 0; |
95954743 | 2207 | ptrace (PTRACE_POKEUSER, pid, (PTRACE_ARG3_TYPE) regaddr, |
2ff29de4 | 2208 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
2209 | if (errno != 0) |
2210 | { | |
1b3f6016 PA |
2211 | /* At this point, ESRCH should mean the process is |
2212 | already gone, in which case we simply ignore attempts | |
2213 | to change its registers. See also the related | |
2214 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2215 | if (errno == ESRCH) |
2216 | return; | |
2217 | ||
bc1e36ca DJ |
2218 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
2219 | { | |
2220 | char *err = strerror (errno); | |
2221 | char *msg = alloca (strlen (err) + 128); | |
2222 | sprintf (msg, "writing register %d: %s", | |
2223 | regno, err); | |
2224 | error (msg); | |
2225 | return; | |
2226 | } | |
da6d8c04 | 2227 | } |
2ff29de4 | 2228 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2229 | } |
da6d8c04 DJ |
2230 | } |
2231 | else | |
2ec06d2e | 2232 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 2233 | usr_store_inferior_registers (regno); |
da6d8c04 | 2234 | } |
58caa3dc DJ |
2235 | #endif /* HAVE_LINUX_USRREGS */ |
2236 | ||
2237 | ||
2238 | ||
2239 | #ifdef HAVE_LINUX_REGSETS | |
2240 | ||
2241 | static int | |
0d62e5e8 | 2242 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
2243 | { |
2244 | struct regset_info *regset; | |
e9d25b98 | 2245 | int saw_general_regs = 0; |
95954743 | 2246 | int pid; |
58caa3dc DJ |
2247 | |
2248 | regset = target_regsets; | |
2249 | ||
95954743 | 2250 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2251 | while (regset->size >= 0) |
2252 | { | |
2253 | void *buf; | |
2254 | int res; | |
2255 | ||
52fa2412 | 2256 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2257 | { |
2258 | regset ++; | |
2259 | continue; | |
2260 | } | |
2261 | ||
bca929d3 | 2262 | buf = xmalloc (regset->size); |
dfb64f85 | 2263 | #ifndef __sparc__ |
95954743 | 2264 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2265 | #else |
95954743 | 2266 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2267 | #endif |
58caa3dc DJ |
2268 | if (res < 0) |
2269 | { | |
2270 | if (errno == EIO) | |
2271 | { | |
52fa2412 UW |
2272 | /* If we get EIO on a regset, do not try it again for |
2273 | this process. */ | |
2274 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2275 | free (buf); |
52fa2412 | 2276 | continue; |
58caa3dc DJ |
2277 | } |
2278 | else | |
2279 | { | |
0d62e5e8 | 2280 | char s[256]; |
95954743 PA |
2281 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
2282 | pid); | |
0d62e5e8 | 2283 | perror (s); |
58caa3dc DJ |
2284 | } |
2285 | } | |
e9d25b98 DJ |
2286 | else if (regset->type == GENERAL_REGS) |
2287 | saw_general_regs = 1; | |
58caa3dc DJ |
2288 | regset->store_function (buf); |
2289 | regset ++; | |
fdeb2a12 | 2290 | free (buf); |
58caa3dc | 2291 | } |
e9d25b98 DJ |
2292 | if (saw_general_regs) |
2293 | return 0; | |
2294 | else | |
2295 | return 1; | |
58caa3dc DJ |
2296 | } |
2297 | ||
2298 | static int | |
0d62e5e8 | 2299 | regsets_store_inferior_registers () |
58caa3dc DJ |
2300 | { |
2301 | struct regset_info *regset; | |
e9d25b98 | 2302 | int saw_general_regs = 0; |
95954743 | 2303 | int pid; |
58caa3dc DJ |
2304 | |
2305 | regset = target_regsets; | |
2306 | ||
95954743 | 2307 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2308 | while (regset->size >= 0) |
2309 | { | |
2310 | void *buf; | |
2311 | int res; | |
2312 | ||
52fa2412 | 2313 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2314 | { |
2315 | regset ++; | |
2316 | continue; | |
2317 | } | |
2318 | ||
bca929d3 | 2319 | buf = xmalloc (regset->size); |
545587ee DJ |
2320 | |
2321 | /* First fill the buffer with the current register set contents, | |
2322 | in case there are any items in the kernel's regset that are | |
2323 | not in gdbserver's regcache. */ | |
dfb64f85 | 2324 | #ifndef __sparc__ |
95954743 | 2325 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2326 | #else |
95954743 | 2327 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2328 | #endif |
545587ee DJ |
2329 | |
2330 | if (res == 0) | |
2331 | { | |
2332 | /* Then overlay our cached registers on that. */ | |
2333 | regset->fill_function (buf); | |
2334 | ||
2335 | /* Only now do we write the register set. */ | |
dfb64f85 | 2336 | #ifndef __sparc__ |
95954743 | 2337 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 2338 | #else |
95954743 | 2339 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 2340 | #endif |
545587ee DJ |
2341 | } |
2342 | ||
58caa3dc DJ |
2343 | if (res < 0) |
2344 | { | |
2345 | if (errno == EIO) | |
2346 | { | |
52fa2412 UW |
2347 | /* If we get EIO on a regset, do not try it again for |
2348 | this process. */ | |
2349 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2350 | free (buf); |
52fa2412 | 2351 | continue; |
58caa3dc | 2352 | } |
3221518c UW |
2353 | else if (errno == ESRCH) |
2354 | { | |
1b3f6016 PA |
2355 | /* At this point, ESRCH should mean the process is |
2356 | already gone, in which case we simply ignore attempts | |
2357 | to change its registers. See also the related | |
2358 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 2359 | free (buf); |
3221518c UW |
2360 | return 0; |
2361 | } | |
58caa3dc DJ |
2362 | else |
2363 | { | |
ce3a066d | 2364 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
2365 | } |
2366 | } | |
e9d25b98 DJ |
2367 | else if (regset->type == GENERAL_REGS) |
2368 | saw_general_regs = 1; | |
58caa3dc | 2369 | regset ++; |
09ec9b38 | 2370 | free (buf); |
58caa3dc | 2371 | } |
e9d25b98 DJ |
2372 | if (saw_general_regs) |
2373 | return 0; | |
2374 | else | |
2375 | return 1; | |
ce3a066d | 2376 | return 0; |
58caa3dc DJ |
2377 | } |
2378 | ||
2379 | #endif /* HAVE_LINUX_REGSETS */ | |
2380 | ||
2381 | ||
2382 | void | |
ce3a066d | 2383 | linux_fetch_registers (int regno) |
58caa3dc DJ |
2384 | { |
2385 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2386 | if (regsets_fetch_inferior_registers () == 0) |
2387 | return; | |
58caa3dc DJ |
2388 | #endif |
2389 | #ifdef HAVE_LINUX_USRREGS | |
2390 | usr_fetch_inferior_registers (regno); | |
2391 | #endif | |
2392 | } | |
2393 | ||
2394 | void | |
ce3a066d | 2395 | linux_store_registers (int regno) |
58caa3dc DJ |
2396 | { |
2397 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2398 | if (regsets_store_inferior_registers () == 0) |
2399 | return; | |
58caa3dc DJ |
2400 | #endif |
2401 | #ifdef HAVE_LINUX_USRREGS | |
2402 | usr_store_inferior_registers (regno); | |
2403 | #endif | |
2404 | } | |
2405 | ||
da6d8c04 | 2406 | |
da6d8c04 DJ |
2407 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
2408 | to debugger memory starting at MYADDR. */ | |
2409 | ||
c3e735a6 | 2410 | static int |
f450004a | 2411 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
2412 | { |
2413 | register int i; | |
2414 | /* Round starting address down to longword boundary. */ | |
2415 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2416 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
2417 | register int count |
2418 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
2419 | / sizeof (PTRACE_XFER_TYPE); |
2420 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 2421 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 2422 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
2423 | int fd; |
2424 | char filename[64]; | |
95954743 | 2425 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
2426 | |
2427 | /* Try using /proc. Don't bother for one word. */ | |
2428 | if (len >= 3 * sizeof (long)) | |
2429 | { | |
2430 | /* We could keep this file open and cache it - possibly one per | |
2431 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 2432 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
2433 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
2434 | if (fd == -1) | |
2435 | goto no_proc; | |
2436 | ||
2437 | /* If pread64 is available, use it. It's faster if the kernel | |
2438 | supports it (only one syscall), and it's 64-bit safe even on | |
2439 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
2440 | application). */ | |
2441 | #ifdef HAVE_PREAD64 | |
2442 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
2443 | #else | |
1de1badb | 2444 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
2445 | #endif |
2446 | { | |
2447 | close (fd); | |
2448 | goto no_proc; | |
2449 | } | |
2450 | ||
2451 | close (fd); | |
2452 | return 0; | |
2453 | } | |
da6d8c04 | 2454 | |
fd462a61 | 2455 | no_proc: |
da6d8c04 DJ |
2456 | /* Read all the longwords */ |
2457 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2458 | { | |
c3e735a6 | 2459 | errno = 0; |
95954743 | 2460 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
c3e735a6 DJ |
2461 | if (errno) |
2462 | return errno; | |
da6d8c04 DJ |
2463 | } |
2464 | ||
2465 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
2466 | memcpy (myaddr, |
2467 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
2468 | len); | |
c3e735a6 DJ |
2469 | |
2470 | return 0; | |
da6d8c04 DJ |
2471 | } |
2472 | ||
2473 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
2474 | to inferior's memory at MEMADDR. | |
2475 | On failure (cannot write the inferior) | |
2476 | returns the value of errno. */ | |
2477 | ||
ce3a066d | 2478 | static int |
f450004a | 2479 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
2480 | { |
2481 | register int i; | |
2482 | /* Round starting address down to longword boundary. */ | |
2483 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2484 | /* Round ending address up; get number of longwords that makes. */ | |
2485 | register int count | |
2486 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
2487 | /* Allocate buffer of that many longwords. */ | |
2488 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 2489 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 2490 | |
0d62e5e8 DJ |
2491 | if (debug_threads) |
2492 | { | |
58d6951d DJ |
2493 | /* Dump up to four bytes. */ |
2494 | unsigned int val = * (unsigned int *) myaddr; | |
2495 | if (len == 1) | |
2496 | val = val & 0xff; | |
2497 | else if (len == 2) | |
2498 | val = val & 0xffff; | |
2499 | else if (len == 3) | |
2500 | val = val & 0xffffff; | |
2501 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
2502 | val, (long)memaddr); | |
0d62e5e8 DJ |
2503 | } |
2504 | ||
da6d8c04 DJ |
2505 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
2506 | ||
95954743 | 2507 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
da6d8c04 DJ |
2508 | |
2509 | if (count > 1) | |
2510 | { | |
2511 | buffer[count - 1] | |
95954743 | 2512 | = ptrace (PTRACE_PEEKTEXT, pid, |
d844cde6 DJ |
2513 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
2514 | * sizeof (PTRACE_XFER_TYPE)), | |
2515 | 0); | |
da6d8c04 DJ |
2516 | } |
2517 | ||
2518 | /* Copy data to be written over corresponding part of buffer */ | |
2519 | ||
2520 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
2521 | ||
2522 | /* Write the entire buffer. */ | |
2523 | ||
2524 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2525 | { | |
2526 | errno = 0; | |
95954743 | 2527 | ptrace (PTRACE_POKETEXT, pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
2528 | if (errno) |
2529 | return errno; | |
2530 | } | |
2531 | ||
2532 | return 0; | |
2533 | } | |
2f2893d9 | 2534 | |
24a09b5f DJ |
2535 | static int linux_supports_tracefork_flag; |
2536 | ||
51c2684e | 2537 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 2538 | |
51c2684e DJ |
2539 | static int |
2540 | linux_tracefork_grandchild (void *arg) | |
2541 | { | |
2542 | _exit (0); | |
2543 | } | |
2544 | ||
7407e2de AS |
2545 | #define STACK_SIZE 4096 |
2546 | ||
51c2684e DJ |
2547 | static int |
2548 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
2549 | { |
2550 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
2551 | kill (getpid (), SIGSTOP); | |
7407e2de AS |
2552 | #ifdef __ia64__ |
2553 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
2554 | CLONE_VM | SIGCHLD, NULL); | |
2555 | #else | |
2556 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
2557 | CLONE_VM | SIGCHLD, NULL); | |
2558 | #endif | |
24a09b5f DJ |
2559 | _exit (0); |
2560 | } | |
2561 | ||
24a09b5f DJ |
2562 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
2563 | sure that we can enable the option, and that it had the desired | |
2564 | effect. */ | |
2565 | ||
2566 | static void | |
2567 | linux_test_for_tracefork (void) | |
2568 | { | |
2569 | int child_pid, ret, status; | |
2570 | long second_pid; | |
bca929d3 | 2571 | char *stack = xmalloc (STACK_SIZE * 4); |
24a09b5f DJ |
2572 | |
2573 | linux_supports_tracefork_flag = 0; | |
2574 | ||
51c2684e | 2575 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
2576 | #ifdef __ia64__ |
2577 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
2578 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2579 | #else | |
2580 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, | |
2581 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2582 | #endif | |
24a09b5f | 2583 | if (child_pid == -1) |
51c2684e | 2584 | perror_with_name ("clone"); |
24a09b5f DJ |
2585 | |
2586 | ret = my_waitpid (child_pid, &status, 0); | |
2587 | if (ret == -1) | |
2588 | perror_with_name ("waitpid"); | |
2589 | else if (ret != child_pid) | |
2590 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
2591 | if (! WIFSTOPPED (status)) | |
2592 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
2593 | ||
2594 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); | |
2595 | if (ret != 0) | |
2596 | { | |
2597 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2598 | if (ret != 0) | |
2599 | { | |
2600 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2601 | return; | |
2602 | } | |
2603 | ||
2604 | ret = my_waitpid (child_pid, &status, 0); | |
2605 | if (ret != child_pid) | |
2606 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
2607 | else if (!WIFSIGNALED (status)) | |
2608 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
2609 | "killed child", status); | |
2610 | ||
2611 | return; | |
2612 | } | |
2613 | ||
2614 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
2615 | if (ret != 0) | |
2616 | warning ("linux_test_for_tracefork: failed to resume child"); | |
2617 | ||
2618 | ret = my_waitpid (child_pid, &status, 0); | |
2619 | ||
2620 | if (ret == child_pid && WIFSTOPPED (status) | |
2621 | && status >> 16 == PTRACE_EVENT_FORK) | |
2622 | { | |
2623 | second_pid = 0; | |
2624 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
2625 | if (ret == 0 && second_pid != 0) | |
2626 | { | |
2627 | int second_status; | |
2628 | ||
2629 | linux_supports_tracefork_flag = 1; | |
2630 | my_waitpid (second_pid, &second_status, 0); | |
2631 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
2632 | if (ret != 0) | |
2633 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
2634 | my_waitpid (second_pid, &status, 0); | |
2635 | } | |
2636 | } | |
2637 | else | |
2638 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
2639 | "(%d, status 0x%x)", ret, status); | |
2640 | ||
2641 | do | |
2642 | { | |
2643 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2644 | if (ret != 0) | |
2645 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2646 | my_waitpid (child_pid, &status, 0); | |
2647 | } | |
2648 | while (WIFSTOPPED (status)); | |
51c2684e DJ |
2649 | |
2650 | free (stack); | |
24a09b5f DJ |
2651 | } |
2652 | ||
2653 | ||
2f2893d9 DJ |
2654 | static void |
2655 | linux_look_up_symbols (void) | |
2656 | { | |
0d62e5e8 | 2657 | #ifdef USE_THREAD_DB |
95954743 PA |
2658 | struct process_info *proc = current_process (); |
2659 | ||
cdbfd419 | 2660 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
2661 | return; |
2662 | ||
cdbfd419 | 2663 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
2664 | #endif |
2665 | } | |
2666 | ||
e5379b03 | 2667 | static void |
ef57601b | 2668 | linux_request_interrupt (void) |
e5379b03 | 2669 | { |
a1928bad | 2670 | extern unsigned long signal_pid; |
e5379b03 | 2671 | |
95954743 PA |
2672 | if (!ptid_equal (cont_thread, null_ptid) |
2673 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 2674 | { |
54a0b537 | 2675 | struct lwp_info *lwp; |
bd99dc85 | 2676 | int lwpid; |
e5379b03 | 2677 | |
54a0b537 | 2678 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
2679 | lwpid = lwpid_of (lwp); |
2680 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
2681 | } |
2682 | else | |
ef57601b | 2683 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
2684 | } |
2685 | ||
aa691b87 RM |
2686 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
2687 | to debugger memory starting at MYADDR. */ | |
2688 | ||
2689 | static int | |
f450004a | 2690 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
2691 | { |
2692 | char filename[PATH_MAX]; | |
2693 | int fd, n; | |
95954743 | 2694 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 2695 | |
95954743 | 2696 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
2697 | |
2698 | fd = open (filename, O_RDONLY); | |
2699 | if (fd < 0) | |
2700 | return -1; | |
2701 | ||
2702 | if (offset != (CORE_ADDR) 0 | |
2703 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
2704 | n = -1; | |
2705 | else | |
2706 | n = read (fd, myaddr, len); | |
2707 | ||
2708 | close (fd); | |
2709 | ||
2710 | return n; | |
2711 | } | |
2712 | ||
d993e290 PA |
2713 | /* These breakpoint and watchpoint related wrapper functions simply |
2714 | pass on the function call if the target has registered a | |
2715 | corresponding function. */ | |
e013ee27 OF |
2716 | |
2717 | static int | |
d993e290 | 2718 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2719 | { |
d993e290 PA |
2720 | if (the_low_target.insert_point != NULL) |
2721 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
2722 | else |
2723 | /* Unsupported (see target.h). */ | |
2724 | return 1; | |
2725 | } | |
2726 | ||
2727 | static int | |
d993e290 | 2728 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2729 | { |
d993e290 PA |
2730 | if (the_low_target.remove_point != NULL) |
2731 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
2732 | else |
2733 | /* Unsupported (see target.h). */ | |
2734 | return 1; | |
2735 | } | |
2736 | ||
2737 | static int | |
2738 | linux_stopped_by_watchpoint (void) | |
2739 | { | |
2740 | if (the_low_target.stopped_by_watchpoint != NULL) | |
2741 | return the_low_target.stopped_by_watchpoint (); | |
2742 | else | |
2743 | return 0; | |
2744 | } | |
2745 | ||
2746 | static CORE_ADDR | |
2747 | linux_stopped_data_address (void) | |
2748 | { | |
2749 | if (the_low_target.stopped_data_address != NULL) | |
2750 | return the_low_target.stopped_data_address (); | |
2751 | else | |
2752 | return 0; | |
2753 | } | |
2754 | ||
42c81e2a | 2755 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
2756 | #if defined(__mcoldfire__) |
2757 | /* These should really be defined in the kernel's ptrace.h header. */ | |
2758 | #define PT_TEXT_ADDR 49*4 | |
2759 | #define PT_DATA_ADDR 50*4 | |
2760 | #define PT_TEXT_END_ADDR 51*4 | |
2761 | #endif | |
2762 | ||
2763 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
2764 | to tell gdb about. */ | |
2765 | ||
2766 | static int | |
2767 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
2768 | { | |
2769 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
2770 | unsigned long text, text_end, data; | |
bd99dc85 | 2771 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
2772 | |
2773 | errno = 0; | |
2774 | ||
2775 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
2776 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
2777 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
2778 | ||
2779 | if (errno == 0) | |
2780 | { | |
2781 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
2782 | used by gdb) are relative to the beginning of the program, |
2783 | with the data segment immediately following the text segment. | |
2784 | However, the actual runtime layout in memory may put the data | |
2785 | somewhere else, so when we send gdb a data base-address, we | |
2786 | use the real data base address and subtract the compile-time | |
2787 | data base-address from it (which is just the length of the | |
2788 | text segment). BSS immediately follows data in both | |
2789 | cases. */ | |
52fb6437 NS |
2790 | *text_p = text; |
2791 | *data_p = data - (text_end - text); | |
1b3f6016 | 2792 | |
52fb6437 NS |
2793 | return 1; |
2794 | } | |
2795 | #endif | |
2796 | return 0; | |
2797 | } | |
2798 | #endif | |
2799 | ||
07e059b5 VP |
2800 | static int |
2801 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
2802 | unsigned char *readbuf, unsigned const char *writebuf, |
2803 | CORE_ADDR offset, int len) | |
07e059b5 VP |
2804 | { |
2805 | /* We make the process list snapshot when the object starts to be | |
2806 | read. */ | |
2807 | static const char *buf; | |
2808 | static long len_avail = -1; | |
2809 | static struct buffer buffer; | |
2810 | ||
2811 | DIR *dirp; | |
2812 | ||
2813 | if (strcmp (annex, "processes") != 0) | |
2814 | return 0; | |
2815 | ||
2816 | if (!readbuf || writebuf) | |
2817 | return 0; | |
2818 | ||
2819 | if (offset == 0) | |
2820 | { | |
2821 | if (len_avail != -1 && len_avail != 0) | |
2822 | buffer_free (&buffer); | |
2823 | len_avail = 0; | |
2824 | buf = NULL; | |
2825 | buffer_init (&buffer); | |
2826 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
2827 | ||
2828 | dirp = opendir ("/proc"); | |
2829 | if (dirp) | |
2830 | { | |
1b3f6016 PA |
2831 | struct dirent *dp; |
2832 | while ((dp = readdir (dirp)) != NULL) | |
2833 | { | |
2834 | struct stat statbuf; | |
2835 | char procentry[sizeof ("/proc/4294967295")]; | |
2836 | ||
2837 | if (!isdigit (dp->d_name[0]) | |
2838 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
2839 | continue; | |
2840 | ||
2841 | sprintf (procentry, "/proc/%s", dp->d_name); | |
2842 | if (stat (procentry, &statbuf) == 0 | |
2843 | && S_ISDIR (statbuf.st_mode)) | |
2844 | { | |
2845 | char pathname[128]; | |
2846 | FILE *f; | |
2847 | char cmd[MAXPATHLEN + 1]; | |
2848 | struct passwd *entry; | |
2849 | ||
2850 | sprintf (pathname, "/proc/%s/cmdline", dp->d_name); | |
2851 | entry = getpwuid (statbuf.st_uid); | |
2852 | ||
2853 | if ((f = fopen (pathname, "r")) != NULL) | |
2854 | { | |
2855 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
2856 | if (len > 0) | |
2857 | { | |
2858 | int i; | |
2859 | for (i = 0; i < len; i++) | |
2860 | if (cmd[i] == '\0') | |
2861 | cmd[i] = ' '; | |
2862 | cmd[len] = '\0'; | |
2863 | ||
2864 | buffer_xml_printf ( | |
07e059b5 VP |
2865 | &buffer, |
2866 | "<item>" | |
2867 | "<column name=\"pid\">%s</column>" | |
2868 | "<column name=\"user\">%s</column>" | |
2869 | "<column name=\"command\">%s</column>" | |
2870 | "</item>", | |
2871 | dp->d_name, | |
2872 | entry ? entry->pw_name : "?", | |
2873 | cmd); | |
1b3f6016 PA |
2874 | } |
2875 | fclose (f); | |
2876 | } | |
2877 | } | |
2878 | } | |
07e059b5 | 2879 | |
1b3f6016 | 2880 | closedir (dirp); |
07e059b5 VP |
2881 | } |
2882 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
2883 | buf = buffer_finish (&buffer); | |
2884 | len_avail = strlen (buf); | |
2885 | } | |
2886 | ||
2887 | if (offset >= len_avail) | |
2888 | { | |
2889 | /* Done. Get rid of the data. */ | |
2890 | buffer_free (&buffer); | |
2891 | buf = NULL; | |
2892 | len_avail = 0; | |
2893 | return 0; | |
2894 | } | |
2895 | ||
2896 | if (len > len_avail - offset) | |
2897 | len = len_avail - offset; | |
2898 | memcpy (readbuf, buf + offset, len); | |
2899 | ||
2900 | return len; | |
2901 | } | |
2902 | ||
d0722149 DE |
2903 | /* Convert a native/host siginfo object, into/from the siginfo in the |
2904 | layout of the inferiors' architecture. */ | |
2905 | ||
2906 | static void | |
2907 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
2908 | { | |
2909 | int done = 0; | |
2910 | ||
2911 | if (the_low_target.siginfo_fixup != NULL) | |
2912 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
2913 | ||
2914 | /* If there was no callback, or the callback didn't do anything, | |
2915 | then just do a straight memcpy. */ | |
2916 | if (!done) | |
2917 | { | |
2918 | if (direction == 1) | |
2919 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
2920 | else | |
2921 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
2922 | } | |
2923 | } | |
2924 | ||
4aa995e1 PA |
2925 | static int |
2926 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
2927 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
2928 | { | |
d0722149 | 2929 | int pid; |
4aa995e1 | 2930 | struct siginfo siginfo; |
d0722149 | 2931 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
2932 | |
2933 | if (current_inferior == NULL) | |
2934 | return -1; | |
2935 | ||
bd99dc85 | 2936 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
2937 | |
2938 | if (debug_threads) | |
d0722149 | 2939 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
2940 | readbuf != NULL ? "Reading" : "Writing", |
2941 | pid); | |
2942 | ||
2943 | if (offset > sizeof (siginfo)) | |
2944 | return -1; | |
2945 | ||
2946 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
2947 | return -1; | |
2948 | ||
d0722149 DE |
2949 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
2950 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
2951 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
2952 | with a 32-bit GDBSERVER, we need to convert it. */ | |
2953 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
2954 | ||
4aa995e1 PA |
2955 | if (offset + len > sizeof (siginfo)) |
2956 | len = sizeof (siginfo) - offset; | |
2957 | ||
2958 | if (readbuf != NULL) | |
d0722149 | 2959 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
2960 | else |
2961 | { | |
d0722149 DE |
2962 | memcpy (inf_siginfo + offset, writebuf, len); |
2963 | ||
2964 | /* Convert back to ptrace layout before flushing it out. */ | |
2965 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
2966 | ||
4aa995e1 PA |
2967 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
2968 | return -1; | |
2969 | } | |
2970 | ||
2971 | return len; | |
2972 | } | |
2973 | ||
bd99dc85 PA |
2974 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
2975 | so we notice when children change state; as the handler for the | |
2976 | sigsuspend in my_waitpid. */ | |
2977 | ||
2978 | static void | |
2979 | sigchld_handler (int signo) | |
2980 | { | |
2981 | int old_errno = errno; | |
2982 | ||
2983 | if (debug_threads) | |
2984 | /* fprintf is not async-signal-safe, so call write directly. */ | |
2985 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
2986 | ||
2987 | if (target_is_async_p ()) | |
2988 | async_file_mark (); /* trigger a linux_wait */ | |
2989 | ||
2990 | errno = old_errno; | |
2991 | } | |
2992 | ||
2993 | static int | |
2994 | linux_supports_non_stop (void) | |
2995 | { | |
2996 | return 1; | |
2997 | } | |
2998 | ||
2999 | static int | |
3000 | linux_async (int enable) | |
3001 | { | |
3002 | int previous = (linux_event_pipe[0] != -1); | |
3003 | ||
3004 | if (previous != enable) | |
3005 | { | |
3006 | sigset_t mask; | |
3007 | sigemptyset (&mask); | |
3008 | sigaddset (&mask, SIGCHLD); | |
3009 | ||
3010 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
3011 | ||
3012 | if (enable) | |
3013 | { | |
3014 | if (pipe (linux_event_pipe) == -1) | |
3015 | fatal ("creating event pipe failed."); | |
3016 | ||
3017 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
3018 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
3019 | ||
3020 | /* Register the event loop handler. */ | |
3021 | add_file_handler (linux_event_pipe[0], | |
3022 | handle_target_event, NULL); | |
3023 | ||
3024 | /* Always trigger a linux_wait. */ | |
3025 | async_file_mark (); | |
3026 | } | |
3027 | else | |
3028 | { | |
3029 | delete_file_handler (linux_event_pipe[0]); | |
3030 | ||
3031 | close (linux_event_pipe[0]); | |
3032 | close (linux_event_pipe[1]); | |
3033 | linux_event_pipe[0] = -1; | |
3034 | linux_event_pipe[1] = -1; | |
3035 | } | |
3036 | ||
3037 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
3038 | } | |
3039 | ||
3040 | return previous; | |
3041 | } | |
3042 | ||
3043 | static int | |
3044 | linux_start_non_stop (int nonstop) | |
3045 | { | |
3046 | /* Register or unregister from event-loop accordingly. */ | |
3047 | linux_async (nonstop); | |
3048 | return 0; | |
3049 | } | |
3050 | ||
cf8fd78b PA |
3051 | static int |
3052 | linux_supports_multi_process (void) | |
3053 | { | |
3054 | return 1; | |
3055 | } | |
3056 | ||
efcbbd14 UW |
3057 | |
3058 | /* Enumerate spufs IDs for process PID. */ | |
3059 | static int | |
3060 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
3061 | { | |
3062 | int pos = 0; | |
3063 | int written = 0; | |
3064 | char path[128]; | |
3065 | DIR *dir; | |
3066 | struct dirent *entry; | |
3067 | ||
3068 | sprintf (path, "/proc/%ld/fd", pid); | |
3069 | dir = opendir (path); | |
3070 | if (!dir) | |
3071 | return -1; | |
3072 | ||
3073 | rewinddir (dir); | |
3074 | while ((entry = readdir (dir)) != NULL) | |
3075 | { | |
3076 | struct stat st; | |
3077 | struct statfs stfs; | |
3078 | int fd; | |
3079 | ||
3080 | fd = atoi (entry->d_name); | |
3081 | if (!fd) | |
3082 | continue; | |
3083 | ||
3084 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
3085 | if (stat (path, &st) != 0) | |
3086 | continue; | |
3087 | if (!S_ISDIR (st.st_mode)) | |
3088 | continue; | |
3089 | ||
3090 | if (statfs (path, &stfs) != 0) | |
3091 | continue; | |
3092 | if (stfs.f_type != SPUFS_MAGIC) | |
3093 | continue; | |
3094 | ||
3095 | if (pos >= offset && pos + 4 <= offset + len) | |
3096 | { | |
3097 | *(unsigned int *)(buf + pos - offset) = fd; | |
3098 | written += 4; | |
3099 | } | |
3100 | pos += 4; | |
3101 | } | |
3102 | ||
3103 | closedir (dir); | |
3104 | return written; | |
3105 | } | |
3106 | ||
3107 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
3108 | object type, using the /proc file system. */ | |
3109 | static int | |
3110 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
3111 | unsigned const char *writebuf, | |
3112 | CORE_ADDR offset, int len) | |
3113 | { | |
3114 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
3115 | char buf[128]; | |
3116 | int fd = 0; | |
3117 | int ret = 0; | |
3118 | ||
3119 | if (!writebuf && !readbuf) | |
3120 | return -1; | |
3121 | ||
3122 | if (!*annex) | |
3123 | { | |
3124 | if (!readbuf) | |
3125 | return -1; | |
3126 | else | |
3127 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
3128 | } | |
3129 | ||
3130 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
3131 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
3132 | if (fd <= 0) | |
3133 | return -1; | |
3134 | ||
3135 | if (offset != 0 | |
3136 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
3137 | { | |
3138 | close (fd); | |
3139 | return 0; | |
3140 | } | |
3141 | ||
3142 | if (writebuf) | |
3143 | ret = write (fd, writebuf, (size_t) len); | |
3144 | else | |
3145 | ret = read (fd, readbuf, (size_t) len); | |
3146 | ||
3147 | close (fd); | |
3148 | return ret; | |
3149 | } | |
3150 | ||
ce3a066d DJ |
3151 | static struct target_ops linux_target_ops = { |
3152 | linux_create_inferior, | |
3153 | linux_attach, | |
3154 | linux_kill, | |
6ad8ae5c | 3155 | linux_detach, |
444d6139 | 3156 | linux_join, |
ce3a066d DJ |
3157 | linux_thread_alive, |
3158 | linux_resume, | |
3159 | linux_wait, | |
3160 | linux_fetch_registers, | |
3161 | linux_store_registers, | |
3162 | linux_read_memory, | |
3163 | linux_write_memory, | |
2f2893d9 | 3164 | linux_look_up_symbols, |
ef57601b | 3165 | linux_request_interrupt, |
aa691b87 | 3166 | linux_read_auxv, |
d993e290 PA |
3167 | linux_insert_point, |
3168 | linux_remove_point, | |
e013ee27 OF |
3169 | linux_stopped_by_watchpoint, |
3170 | linux_stopped_data_address, | |
42c81e2a | 3171 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 3172 | linux_read_offsets, |
dae5f5cf DJ |
3173 | #else |
3174 | NULL, | |
3175 | #endif | |
3176 | #ifdef USE_THREAD_DB | |
3177 | thread_db_get_tls_address, | |
3178 | #else | |
3179 | NULL, | |
52fb6437 | 3180 | #endif |
efcbbd14 | 3181 | linux_qxfer_spu, |
59a016f0 | 3182 | hostio_last_error_from_errno, |
07e059b5 | 3183 | linux_qxfer_osdata, |
4aa995e1 | 3184 | linux_xfer_siginfo, |
bd99dc85 PA |
3185 | linux_supports_non_stop, |
3186 | linux_async, | |
3187 | linux_start_non_stop, | |
cdbfd419 PP |
3188 | linux_supports_multi_process, |
3189 | #ifdef USE_THREAD_DB | |
3190 | thread_db_handle_monitor_command | |
3191 | #else | |
3192 | NULL | |
3193 | #endif | |
ce3a066d DJ |
3194 | }; |
3195 | ||
0d62e5e8 DJ |
3196 | static void |
3197 | linux_init_signals () | |
3198 | { | |
3199 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
3200 | to find what the cancel signal actually is. */ | |
254787d4 | 3201 | signal (__SIGRTMIN+1, SIG_IGN); |
0d62e5e8 DJ |
3202 | } |
3203 | ||
da6d8c04 DJ |
3204 | void |
3205 | initialize_low (void) | |
3206 | { | |
bd99dc85 PA |
3207 | struct sigaction sigchld_action; |
3208 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 3209 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
3210 | set_breakpoint_data (the_low_target.breakpoint, |
3211 | the_low_target.breakpoint_len); | |
0d62e5e8 | 3212 | linux_init_signals (); |
24a09b5f | 3213 | linux_test_for_tracefork (); |
52fa2412 UW |
3214 | #ifdef HAVE_LINUX_REGSETS |
3215 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
3216 | ; | |
bca929d3 | 3217 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 3218 | #endif |
bd99dc85 PA |
3219 | |
3220 | sigchld_action.sa_handler = sigchld_handler; | |
3221 | sigemptyset (&sigchld_action.sa_mask); | |
3222 | sigchld_action.sa_flags = SA_RESTART; | |
3223 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 3224 | } |