Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
545587ee | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
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); |
97438e3f | 137 | static int my_waitpid (int pid, int *status, int flags); |
c35fafde | 138 | static int linux_stopped_by_watchpoint (void); |
95954743 | 139 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
0d62e5e8 DJ |
140 | |
141 | struct pending_signals | |
142 | { | |
143 | int signal; | |
32ca6d61 | 144 | siginfo_t info; |
0d62e5e8 DJ |
145 | struct pending_signals *prev; |
146 | }; | |
611cb4a5 | 147 | |
d844cde6 | 148 | #define PTRACE_ARG3_TYPE long |
c6ecbae5 | 149 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 150 | |
58caa3dc | 151 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
152 | static char *disabled_regsets; |
153 | static int num_regsets; | |
58caa3dc DJ |
154 | #endif |
155 | ||
bd99dc85 PA |
156 | /* The read/write ends of the pipe registered as waitable file in the |
157 | event loop. */ | |
158 | static int linux_event_pipe[2] = { -1, -1 }; | |
159 | ||
160 | /* True if we're currently in async mode. */ | |
161 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
162 | ||
163 | static void send_sigstop (struct inferior_list_entry *entry); | |
164 | static void wait_for_sigstop (struct inferior_list_entry *entry); | |
165 | ||
d0722149 DE |
166 | /* Accepts an integer PID; Returns a string representing a file that |
167 | can be opened to get info for the child process. | |
168 | Space for the result is malloc'd, caller must free. */ | |
169 | ||
170 | char * | |
171 | linux_child_pid_to_exec_file (int pid) | |
172 | { | |
173 | char *name1, *name2; | |
174 | ||
175 | name1 = xmalloc (MAXPATHLEN); | |
176 | name2 = xmalloc (MAXPATHLEN); | |
177 | memset (name2, 0, MAXPATHLEN); | |
178 | ||
179 | sprintf (name1, "/proc/%d/exe", pid); | |
180 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
181 | { | |
182 | free (name1); | |
183 | return name2; | |
184 | } | |
185 | else | |
186 | { | |
187 | free (name2); | |
188 | return name1; | |
189 | } | |
190 | } | |
191 | ||
192 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
193 | ||
194 | static int | |
195 | elf_64_header_p (const Elf64_External_Ehdr *header) | |
196 | { | |
197 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
198 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
199 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
200 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
201 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
202 | } | |
203 | ||
204 | /* Return non-zero if FILE is a 64-bit ELF file, | |
205 | zero if the file is not a 64-bit ELF file, | |
206 | and -1 if the file is not accessible or doesn't exist. */ | |
207 | ||
208 | int | |
209 | elf_64_file_p (const char *file) | |
210 | { | |
211 | Elf64_External_Ehdr header; | |
212 | int fd; | |
213 | ||
214 | fd = open (file, O_RDONLY); | |
215 | if (fd < 0) | |
216 | return -1; | |
217 | ||
218 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
219 | { | |
220 | close (fd); | |
221 | return 0; | |
222 | } | |
223 | close (fd); | |
224 | ||
225 | return elf_64_header_p (&header); | |
226 | } | |
227 | ||
bd99dc85 PA |
228 | static void |
229 | delete_lwp (struct lwp_info *lwp) | |
230 | { | |
231 | remove_thread (get_lwp_thread (lwp)); | |
232 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 233 | free (lwp->arch_private); |
bd99dc85 PA |
234 | free (lwp); |
235 | } | |
236 | ||
95954743 PA |
237 | /* Add a process to the common process list, and set its private |
238 | data. */ | |
239 | ||
240 | static struct process_info * | |
241 | linux_add_process (int pid, int attached) | |
242 | { | |
243 | struct process_info *proc; | |
244 | ||
245 | /* Is this the first process? If so, then set the arch. */ | |
246 | if (all_processes.head == NULL) | |
247 | new_inferior = 1; | |
248 | ||
249 | proc = add_process (pid, attached); | |
250 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
251 | ||
aa5ca48f DE |
252 | if (the_low_target.new_process != NULL) |
253 | proc->private->arch_private = the_low_target.new_process (); | |
254 | ||
95954743 PA |
255 | return proc; |
256 | } | |
257 | ||
5091eb23 DE |
258 | /* Remove a process from the common process list, |
259 | also freeing all private data. */ | |
260 | ||
261 | static void | |
262 | linux_remove_process (struct process_info *process) | |
263 | { | |
aa5ca48f | 264 | free (process->private->arch_private); |
5091eb23 DE |
265 | free (process->private); |
266 | remove_process (process); | |
267 | } | |
268 | ||
bd99dc85 PA |
269 | /* Handle a GNU/Linux extended wait response. If we see a clone |
270 | event, we need to add the new LWP to our list (and not report the | |
271 | trap to higher layers). */ | |
0d62e5e8 | 272 | |
24a09b5f | 273 | static void |
54a0b537 | 274 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
275 | { |
276 | int event = wstat >> 16; | |
54a0b537 | 277 | struct lwp_info *new_lwp; |
24a09b5f DJ |
278 | |
279 | if (event == PTRACE_EVENT_CLONE) | |
280 | { | |
95954743 | 281 | ptid_t ptid; |
24a09b5f | 282 | unsigned long new_pid; |
836acd6d | 283 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 284 | |
bd99dc85 | 285 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
286 | |
287 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
288 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
289 | { | |
290 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
291 | hits the SIGSTOP, but we're already attached. */ | |
292 | ||
97438e3f | 293 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
294 | |
295 | if (ret == -1) | |
296 | perror_with_name ("waiting for new child"); | |
297 | else if (ret != new_pid) | |
298 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 299 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
300 | warning ("wait returned unexpected status 0x%x", status); |
301 | } | |
302 | ||
303 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE); | |
304 | ||
95954743 PA |
305 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
306 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
307 | add_thread (ptid, new_lwp); | |
24a09b5f | 308 | |
e27d73f6 DE |
309 | /* Either we're going to immediately resume the new thread |
310 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
311 | thinks the thread is currently running, so set this first | |
312 | before calling linux_resume_one_lwp. */ | |
313 | new_lwp->stopped = 1; | |
314 | ||
da5898ce DJ |
315 | /* Normally we will get the pending SIGSTOP. But in some cases |
316 | we might get another signal delivered to the group first. | |
f21cc1a2 | 317 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
318 | if (WSTOPSIG (status) == SIGSTOP) |
319 | { | |
e27d73f6 DE |
320 | if (! stopping_threads) |
321 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); | |
da5898ce | 322 | } |
24a09b5f | 323 | else |
da5898ce | 324 | { |
54a0b537 | 325 | new_lwp->stop_expected = 1; |
da5898ce DJ |
326 | if (stopping_threads) |
327 | { | |
54a0b537 PA |
328 | new_lwp->status_pending_p = 1; |
329 | new_lwp->status_pending = status; | |
da5898ce DJ |
330 | } |
331 | else | |
332 | /* Pass the signal on. This is what GDB does - except | |
333 | shouldn't we really report it instead? */ | |
e27d73f6 | 334 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 335 | } |
24a09b5f DJ |
336 | |
337 | /* Always resume the current thread. If we are stopping | |
338 | threads, it will have a pending SIGSTOP; we may as well | |
339 | collect it now. */ | |
2acc282a | 340 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
341 | } |
342 | } | |
343 | ||
0d62e5e8 DJ |
344 | /* This function should only be called if the process got a SIGTRAP. |
345 | The SIGTRAP could mean several things. | |
346 | ||
347 | On i386, where decr_pc_after_break is non-zero: | |
348 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
349 | we will get only the one SIGTRAP (even if the instruction we | |
350 | stepped over was a breakpoint). The value of $eip will be the | |
351 | next instruction. | |
352 | If we continue the process using PTRACE_CONT, we will get a | |
353 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
354 | the instruction after the breakpoint (i.e. needs to be | |
355 | decremented). If we report the SIGTRAP to GDB, we must also | |
356 | report the undecremented PC. If we cancel the SIGTRAP, we | |
357 | must resume at the decremented PC. | |
358 | ||
359 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
360 | with hardware or kernel single-step: | |
361 | If we single-step over a breakpoint instruction, our PC will | |
362 | point at the following instruction. If we continue and hit a | |
363 | breakpoint instruction, our PC will point at the breakpoint | |
364 | instruction. */ | |
365 | ||
366 | static CORE_ADDR | |
367 | get_stop_pc (void) | |
368 | { | |
369 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
370 | ||
47c0c975 DE |
371 | if (! get_thread_lwp (current_inferior)->stepping) |
372 | stop_pc -= the_low_target.decr_pc_after_break; | |
373 | ||
374 | if (debug_threads) | |
375 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
376 | ||
377 | return stop_pc; | |
0d62e5e8 | 378 | } |
ce3a066d | 379 | |
0d62e5e8 | 380 | static void * |
95954743 | 381 | add_lwp (ptid_t ptid) |
611cb4a5 | 382 | { |
54a0b537 | 383 | struct lwp_info *lwp; |
0d62e5e8 | 384 | |
54a0b537 PA |
385 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
386 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 387 | |
95954743 | 388 | lwp->head.id = ptid; |
0d62e5e8 | 389 | |
aa5ca48f DE |
390 | if (the_low_target.new_thread != NULL) |
391 | lwp->arch_private = the_low_target.new_thread (); | |
392 | ||
54a0b537 | 393 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 394 | |
54a0b537 | 395 | return lwp; |
0d62e5e8 | 396 | } |
611cb4a5 | 397 | |
da6d8c04 DJ |
398 | /* Start an inferior process and returns its pid. |
399 | ALLARGS is a vector of program-name and args. */ | |
400 | ||
ce3a066d DJ |
401 | static int |
402 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 403 | { |
a6dbe5df | 404 | struct lwp_info *new_lwp; |
da6d8c04 | 405 | int pid; |
95954743 | 406 | ptid_t ptid; |
da6d8c04 | 407 | |
42c81e2a | 408 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
409 | pid = vfork (); |
410 | #else | |
da6d8c04 | 411 | pid = fork (); |
52fb6437 | 412 | #endif |
da6d8c04 DJ |
413 | if (pid < 0) |
414 | perror_with_name ("fork"); | |
415 | ||
416 | if (pid == 0) | |
417 | { | |
418 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
419 | ||
254787d4 | 420 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 421 | |
a9fa9f7d DJ |
422 | setpgid (0, 0); |
423 | ||
2b876972 DJ |
424 | execv (program, allargs); |
425 | if (errno == ENOENT) | |
426 | execvp (program, allargs); | |
da6d8c04 DJ |
427 | |
428 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 429 | strerror (errno)); |
da6d8c04 DJ |
430 | fflush (stderr); |
431 | _exit (0177); | |
432 | } | |
433 | ||
95954743 PA |
434 | linux_add_process (pid, 0); |
435 | ||
436 | ptid = ptid_build (pid, pid, 0); | |
437 | new_lwp = add_lwp (ptid); | |
438 | add_thread (ptid, new_lwp); | |
a6dbe5df | 439 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 440 | |
a9fa9f7d | 441 | return pid; |
da6d8c04 DJ |
442 | } |
443 | ||
444 | /* Attach to an inferior process. */ | |
445 | ||
95954743 PA |
446 | static void |
447 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 448 | { |
95954743 | 449 | ptid_t ptid; |
54a0b537 | 450 | struct lwp_info *new_lwp; |
611cb4a5 | 451 | |
95954743 | 452 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 453 | { |
95954743 | 454 | if (!initial) |
2d717e4f DJ |
455 | { |
456 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 457 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
458 | strerror (errno), errno); |
459 | fflush (stderr); | |
460 | return; | |
461 | } | |
462 | else | |
463 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 464 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 465 | strerror (errno), errno); |
da6d8c04 DJ |
466 | } |
467 | ||
95954743 PA |
468 | if (initial) |
469 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
470 | ptid = ptid_build (lwpid, lwpid, 0); | |
471 | else | |
472 | { | |
473 | /* Note that extracting the pid from the current inferior is | |
474 | safe, since we're always called in the context of the same | |
475 | process as this new thread. */ | |
476 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
477 | ptid = ptid_build (pid, lwpid, 0); | |
478 | } | |
24a09b5f | 479 | |
95954743 PA |
480 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
481 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 482 | |
a6dbe5df PA |
483 | /* We need to wait for SIGSTOP before being able to make the next |
484 | ptrace call on this LWP. */ | |
485 | new_lwp->must_set_ptrace_flags = 1; | |
486 | ||
0d62e5e8 | 487 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
488 | brings it to a halt. |
489 | ||
490 | There are several cases to consider here: | |
491 | ||
492 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 PA |
493 | of a new thread that is being created. |
494 | In this case we should ignore that SIGSTOP and resume the process. | |
495 | This is handled below by setting stop_expected = 1. | |
0e21c1ec DE |
496 | |
497 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
498 | to it via attach_inferior. |
499 | In this case we want the process thread to stop. | |
500 | This is handled by having linux_attach clear stop_expected after | |
501 | we return. | |
502 | ??? If the process already has several threads we leave the other | |
503 | threads running. | |
0e21c1ec DE |
504 | |
505 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
506 | existing threads. |
507 | In this case we want the thread to stop. | |
508 | FIXME: This case is currently not properly handled. | |
509 | We should wait for the SIGSTOP but don't. Things work apparently | |
510 | because enough time passes between when we ptrace (ATTACH) and when | |
511 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
512 | |
513 | On the other hand, if we are currently trying to stop all threads, we | |
514 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 515 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
516 | end of the list, and so the new thread has not yet reached |
517 | wait_for_sigstop (but will). */ | |
0d62e5e8 | 518 | if (! stopping_threads) |
54a0b537 | 519 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
520 | } |
521 | ||
95954743 PA |
522 | void |
523 | linux_attach_lwp (unsigned long lwpid) | |
524 | { | |
525 | linux_attach_lwp_1 (lwpid, 0); | |
526 | } | |
527 | ||
0d62e5e8 | 528 | int |
a1928bad | 529 | linux_attach (unsigned long pid) |
0d62e5e8 | 530 | { |
54a0b537 | 531 | struct lwp_info *lwp; |
0d62e5e8 | 532 | |
95954743 PA |
533 | linux_attach_lwp_1 (pid, 1); |
534 | ||
535 | linux_add_process (pid, 1); | |
0d62e5e8 | 536 | |
bd99dc85 PA |
537 | if (!non_stop) |
538 | { | |
539 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
540 | process. It will be collected by wait shortly. */ | |
95954743 PA |
541 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
542 | ptid_build (pid, pid, 0)); | |
bd99dc85 PA |
543 | lwp->stop_expected = 0; |
544 | } | |
0d62e5e8 | 545 | |
95954743 PA |
546 | return 0; |
547 | } | |
548 | ||
549 | struct counter | |
550 | { | |
551 | int pid; | |
552 | int count; | |
553 | }; | |
554 | ||
555 | static int | |
556 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
557 | { | |
558 | struct counter *counter = args; | |
559 | ||
560 | if (ptid_get_pid (entry->id) == counter->pid) | |
561 | { | |
562 | if (++counter->count > 1) | |
563 | return 1; | |
564 | } | |
d61ddec4 | 565 | |
da6d8c04 DJ |
566 | return 0; |
567 | } | |
568 | ||
95954743 PA |
569 | static int |
570 | last_thread_of_process_p (struct thread_info *thread) | |
571 | { | |
572 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
573 | int pid = ptid_get_pid (ptid); | |
574 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 575 | |
95954743 PA |
576 | return (find_inferior (&all_threads, |
577 | second_thread_of_pid_p, &counter) == NULL); | |
578 | } | |
579 | ||
580 | /* Kill the inferior lwp. */ | |
581 | ||
582 | static int | |
583 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 584 | { |
0d62e5e8 | 585 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 586 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 587 | int wstat; |
95954743 PA |
588 | int pid = * (int *) args; |
589 | ||
590 | if (ptid_get_pid (entry->id) != pid) | |
591 | return 0; | |
0d62e5e8 | 592 | |
fd500816 DJ |
593 | /* We avoid killing the first thread here, because of a Linux kernel (at |
594 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
595 | the children get a chance to be reaped, it will remain a zombie | |
596 | forever. */ | |
95954743 | 597 | |
12b42a12 | 598 | if (lwpid_of (lwp) == pid) |
95954743 PA |
599 | { |
600 | if (debug_threads) | |
601 | fprintf (stderr, "lkop: is last of process %s\n", | |
602 | target_pid_to_str (entry->id)); | |
603 | return 0; | |
604 | } | |
fd500816 | 605 | |
bd99dc85 PA |
606 | /* If we're killing a running inferior, make sure it is stopped |
607 | first, as PTRACE_KILL will not work otherwise. */ | |
608 | if (!lwp->stopped) | |
609 | send_sigstop (&lwp->head); | |
610 | ||
0d62e5e8 DJ |
611 | do |
612 | { | |
bd99dc85 | 613 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
614 | |
615 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 616 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 617 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
618 | |
619 | return 0; | |
da6d8c04 DJ |
620 | } |
621 | ||
95954743 PA |
622 | static int |
623 | linux_kill (int pid) | |
0d62e5e8 | 624 | { |
95954743 | 625 | struct process_info *process; |
54a0b537 | 626 | struct lwp_info *lwp; |
95954743 | 627 | struct thread_info *thread; |
fd500816 | 628 | int wstat; |
95954743 | 629 | int lwpid; |
fd500816 | 630 | |
95954743 PA |
631 | process = find_process_pid (pid); |
632 | if (process == NULL) | |
633 | return -1; | |
9d606399 | 634 | |
95954743 | 635 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 636 | |
54a0b537 | 637 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 638 | thread in the list, so do so now. */ |
95954743 PA |
639 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
640 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
641 | |
642 | if (debug_threads) | |
95954743 PA |
643 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
644 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
645 | |
646 | /* If we're killing a running inferior, make sure it is stopped | |
647 | first, as PTRACE_KILL will not work otherwise. */ | |
648 | if (!lwp->stopped) | |
649 | send_sigstop (&lwp->head); | |
650 | ||
fd500816 DJ |
651 | do |
652 | { | |
bd99dc85 | 653 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
654 | |
655 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
656 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
657 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 658 | |
bd99dc85 | 659 | delete_lwp (lwp); |
5091eb23 | 660 | linux_remove_process (process); |
95954743 | 661 | return 0; |
0d62e5e8 DJ |
662 | } |
663 | ||
95954743 PA |
664 | static int |
665 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
666 | { |
667 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 668 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
669 | int pid = * (int *) args; |
670 | ||
671 | if (ptid_get_pid (entry->id) != pid) | |
672 | return 0; | |
6ad8ae5c | 673 | |
bd99dc85 PA |
674 | /* If we're detaching from a running inferior, make sure it is |
675 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
676 | if (!lwp->stopped) | |
677 | { | |
95954743 | 678 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
679 | |
680 | stopping_threads = 1; | |
681 | send_sigstop (&lwp->head); | |
682 | ||
683 | /* If this detects a new thread through a clone event, the new | |
684 | thread is appended to the end of the lwp list, so we'll | |
685 | eventually detach from it. */ | |
686 | wait_for_sigstop (&lwp->head); | |
687 | stopping_threads = 0; | |
688 | ||
689 | /* If LWP exits while we're trying to stop it, there's nothing | |
690 | left to do. */ | |
95954743 | 691 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 692 | if (lwp == NULL) |
95954743 | 693 | return 0; |
bd99dc85 PA |
694 | } |
695 | ||
ae13219e DJ |
696 | /* Make sure the process isn't stopped at a breakpoint that's |
697 | no longer there. */ | |
54a0b537 | 698 | check_removed_breakpoint (lwp); |
ae13219e DJ |
699 | |
700 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
701 | sure we take care of that now. This isn't absolutely guaranteed | |
702 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 703 | if (lwp->stop_expected) |
ae13219e | 704 | { |
bd99dc85 | 705 | int wstat; |
ae13219e | 706 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
707 | lwp->stop_expected = 0; |
708 | if (lwp->stopped) | |
2acc282a | 709 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 710 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
711 | } |
712 | ||
713 | /* Flush any pending changes to the process's registers. */ | |
714 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 715 | get_lwp_thread (lwp)); |
ae13219e DJ |
716 | |
717 | /* Finally, let it resume. */ | |
bd99dc85 PA |
718 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
719 | ||
720 | delete_lwp (lwp); | |
95954743 | 721 | return 0; |
6ad8ae5c DJ |
722 | } |
723 | ||
dd6953e1 | 724 | static int |
95954743 | 725 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 726 | { |
95954743 PA |
727 | int *pid_p = args; |
728 | ||
729 | if (ptid_get_pid (entry->id) == *pid_p) | |
730 | return 1; | |
731 | ||
732 | return 0; | |
733 | } | |
734 | ||
735 | static int | |
736 | linux_detach (int pid) | |
737 | { | |
738 | struct process_info *process; | |
739 | ||
740 | process = find_process_pid (pid); | |
741 | if (process == NULL) | |
742 | return -1; | |
743 | ||
744 | current_inferior = | |
745 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
746 | ||
ae13219e | 747 | delete_all_breakpoints (); |
95954743 | 748 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
5091eb23 | 749 | linux_remove_process (process); |
dd6953e1 | 750 | return 0; |
6ad8ae5c DJ |
751 | } |
752 | ||
444d6139 | 753 | static void |
95954743 | 754 | linux_join (int pid) |
444d6139 | 755 | { |
444d6139 | 756 | int status, ret; |
95954743 | 757 | struct process_info *process; |
bd99dc85 | 758 | |
95954743 PA |
759 | process = find_process_pid (pid); |
760 | if (process == NULL) | |
761 | return; | |
444d6139 PA |
762 | |
763 | do { | |
95954743 | 764 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
765 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
766 | break; | |
767 | } while (ret != -1 || errno != ECHILD); | |
768 | } | |
769 | ||
6ad8ae5c | 770 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 771 | static int |
95954743 | 772 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 773 | { |
95954743 PA |
774 | struct lwp_info *lwp = find_lwp_pid (ptid); |
775 | ||
776 | /* We assume we always know if a thread exits. If a whole process | |
777 | exited but we still haven't been able to report it to GDB, we'll | |
778 | hold on to the last lwp of the dead process. */ | |
779 | if (lwp != NULL) | |
780 | return !lwp->dead; | |
0d62e5e8 DJ |
781 | else |
782 | return 0; | |
783 | } | |
784 | ||
785 | /* Return nonzero if this process stopped at a breakpoint which | |
786 | no longer appears to be inserted. Also adjust the PC | |
787 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 788 | static int |
54a0b537 | 789 | check_removed_breakpoint (struct lwp_info *event_child) |
da6d8c04 | 790 | { |
0d62e5e8 DJ |
791 | CORE_ADDR stop_pc; |
792 | struct thread_info *saved_inferior; | |
793 | ||
794 | if (event_child->pending_is_breakpoint == 0) | |
795 | return 0; | |
796 | ||
797 | if (debug_threads) | |
54a0b537 | 798 | fprintf (stderr, "Checking for breakpoint in lwp %ld.\n", |
bd99dc85 | 799 | lwpid_of (event_child)); |
0d62e5e8 DJ |
800 | |
801 | saved_inferior = current_inferior; | |
54a0b537 | 802 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 DJ |
803 | |
804 | stop_pc = get_stop_pc (); | |
805 | ||
806 | /* If the PC has changed since we stopped, then we shouldn't do | |
807 | anything. This happens if, for instance, GDB handled the | |
808 | decr_pc_after_break subtraction itself. */ | |
809 | if (stop_pc != event_child->pending_stop_pc) | |
810 | { | |
811 | if (debug_threads) | |
ae13219e DJ |
812 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
813 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
814 | |
815 | event_child->pending_is_breakpoint = 0; | |
816 | current_inferior = saved_inferior; | |
817 | return 0; | |
818 | } | |
819 | ||
820 | /* If the breakpoint is still there, we will report hitting it. */ | |
821 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
822 | { | |
823 | if (debug_threads) | |
824 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
825 | current_inferior = saved_inferior; | |
826 | return 0; | |
827 | } | |
828 | ||
829 | if (debug_threads) | |
830 | fprintf (stderr, "Removed breakpoint.\n"); | |
831 | ||
832 | /* For decr_pc_after_break targets, here is where we perform the | |
833 | decrement. We go immediately from this function to resuming, | |
834 | and can not safely call get_stop_pc () again. */ | |
835 | if (the_low_target.set_pc != NULL) | |
47c0c975 DE |
836 | { |
837 | if (debug_threads) | |
838 | fprintf (stderr, "Set pc to 0x%lx\n", (long) stop_pc); | |
839 | (*the_low_target.set_pc) (stop_pc); | |
840 | } | |
0d62e5e8 DJ |
841 | |
842 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 843 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
844 | event_child->status_pending_p = 0; |
845 | event_child->status_pending = 0; | |
846 | ||
847 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
848 | return 1; |
849 | } | |
850 | ||
54a0b537 PA |
851 | /* Return 1 if this lwp has an interesting status pending. This |
852 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 853 | static int |
95954743 | 854 | status_pending_p (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 855 | { |
54a0b537 | 856 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 PA |
857 | ptid_t ptid = * (ptid_t *) arg; |
858 | ||
859 | /* Check if we're only interested in events from a specific process | |
860 | or its lwps. */ | |
861 | if (!ptid_equal (minus_one_ptid, ptid) | |
862 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
863 | return 0; | |
0d62e5e8 | 864 | |
bd99dc85 | 865 | if (lwp->status_pending_p && !lwp->suspended) |
54a0b537 | 866 | if (check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
867 | { |
868 | /* This thread was stopped at a breakpoint, and the breakpoint | |
869 | is now gone. We were told to continue (or step...) all threads, | |
870 | so GDB isn't trying to single-step past this breakpoint. | |
871 | So instead of reporting the old SIGTRAP, pretend we got to | |
872 | the breakpoint just after it was removed instead of just | |
873 | before; resume the process. */ | |
2acc282a | 874 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
0d62e5e8 DJ |
875 | return 0; |
876 | } | |
877 | ||
bd99dc85 | 878 | return (lwp->status_pending_p && !lwp->suspended); |
0d62e5e8 DJ |
879 | } |
880 | ||
95954743 PA |
881 | static int |
882 | same_lwp (struct inferior_list_entry *entry, void *data) | |
883 | { | |
884 | ptid_t ptid = *(ptid_t *) data; | |
885 | int lwp; | |
886 | ||
887 | if (ptid_get_lwp (ptid) != 0) | |
888 | lwp = ptid_get_lwp (ptid); | |
889 | else | |
890 | lwp = ptid_get_pid (ptid); | |
891 | ||
892 | if (ptid_get_lwp (entry->id) == lwp) | |
893 | return 1; | |
894 | ||
895 | return 0; | |
896 | } | |
897 | ||
898 | struct lwp_info * | |
899 | find_lwp_pid (ptid_t ptid) | |
900 | { | |
901 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
902 | } | |
903 | ||
bd99dc85 | 904 | static struct lwp_info * |
95954743 | 905 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 906 | { |
0d62e5e8 | 907 | int ret; |
95954743 | 908 | int to_wait_for = -1; |
bd99dc85 | 909 | struct lwp_info *child = NULL; |
0d62e5e8 | 910 | |
bd99dc85 | 911 | if (debug_threads) |
95954743 PA |
912 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
913 | ||
914 | if (ptid_equal (ptid, minus_one_ptid)) | |
915 | to_wait_for = -1; /* any child */ | |
916 | else | |
917 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 918 | |
bd99dc85 | 919 | options |= __WALL; |
0d62e5e8 | 920 | |
bd99dc85 | 921 | retry: |
0d62e5e8 | 922 | |
bd99dc85 PA |
923 | ret = my_waitpid (to_wait_for, wstatp, options); |
924 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
925 | return NULL; | |
926 | else if (ret == -1) | |
927 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
928 | |
929 | if (debug_threads | |
930 | && (!WIFSTOPPED (*wstatp) | |
931 | || (WSTOPSIG (*wstatp) != 32 | |
932 | && WSTOPSIG (*wstatp) != 33))) | |
933 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
934 | ||
95954743 | 935 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 936 | |
24a09b5f DJ |
937 | /* If we didn't find a process, one of two things presumably happened: |
938 | - A process we started and then detached from has exited. Ignore it. | |
939 | - A process we are controlling has forked and the new child's stop | |
940 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 941 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
942 | { |
943 | add_pid_to_list (&stopped_pids, ret); | |
944 | goto retry; | |
945 | } | |
bd99dc85 | 946 | else if (child == NULL) |
24a09b5f DJ |
947 | goto retry; |
948 | ||
bd99dc85 PA |
949 | child->stopped = 1; |
950 | child->pending_is_breakpoint = 0; | |
0d62e5e8 | 951 | |
bd99dc85 | 952 | child->last_status = *wstatp; |
32ca6d61 | 953 | |
d61ddec4 UW |
954 | /* Architecture-specific setup after inferior is running. |
955 | This needs to happen after we have attached to the inferior | |
956 | and it is stopped for the first time, but before we access | |
957 | any inferior registers. */ | |
958 | if (new_inferior) | |
959 | { | |
960 | the_low_target.arch_setup (); | |
52fa2412 UW |
961 | #ifdef HAVE_LINUX_REGSETS |
962 | memset (disabled_regsets, 0, num_regsets); | |
963 | #endif | |
d61ddec4 UW |
964 | new_inferior = 0; |
965 | } | |
966 | ||
0d62e5e8 | 967 | if (debug_threads |
47c0c975 DE |
968 | && WIFSTOPPED (*wstatp) |
969 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 970 | { |
896c7fbb | 971 | struct thread_info *saved_inferior = current_inferior; |
47c0c975 DE |
972 | CORE_ADDR pc; |
973 | ||
0d62e5e8 | 974 | current_inferior = (struct thread_info *) |
95954743 | 975 | find_inferior_id (&all_threads, child->head.id); |
47c0c975 DE |
976 | pc = (*the_low_target.get_pc) (); |
977 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); | |
896c7fbb | 978 | current_inferior = saved_inferior; |
0d62e5e8 | 979 | } |
bd99dc85 PA |
980 | |
981 | return child; | |
0d62e5e8 | 982 | } |
611cb4a5 | 983 | |
bd99dc85 PA |
984 | /* Wait for an event from child PID. If PID is -1, wait for any |
985 | child. Store the stop status through the status pointer WSTAT. | |
986 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
987 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
988 | the stopped child otherwise. */ | |
989 | ||
0d62e5e8 | 990 | static int |
95954743 | 991 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 DJ |
992 | { |
993 | CORE_ADDR stop_pc; | |
bd99dc85 | 994 | struct lwp_info *event_child = NULL; |
b65d95c5 | 995 | int bp_status; |
bd99dc85 | 996 | struct lwp_info *requested_child = NULL; |
0d62e5e8 | 997 | |
95954743 | 998 | /* Check for a lwp with a pending status. */ |
0d62e5e8 DJ |
999 | /* It is possible that the user changed the pending task's registers since |
1000 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 1001 | (in check_removed_breakpoint); signals should be reported anyway. */ |
bd99dc85 | 1002 | |
95954743 PA |
1003 | if (ptid_equal (ptid, minus_one_ptid) |
1004 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1005 | { |
54a0b537 | 1006 | event_child = (struct lwp_info *) |
95954743 | 1007 | find_inferior (&all_lwps, status_pending_p, &ptid); |
0d62e5e8 | 1008 | if (debug_threads && event_child) |
bd99dc85 | 1009 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1010 | } |
1011 | else | |
1012 | { | |
95954743 | 1013 | requested_child = find_lwp_pid (ptid); |
bd99dc85 PA |
1014 | if (requested_child->status_pending_p |
1015 | && !check_removed_breakpoint (requested_child)) | |
1016 | event_child = requested_child; | |
0d62e5e8 | 1017 | } |
611cb4a5 | 1018 | |
0d62e5e8 DJ |
1019 | if (event_child != NULL) |
1020 | { | |
bd99dc85 PA |
1021 | if (debug_threads) |
1022 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1023 | lwpid_of (event_child), event_child->status_pending); | |
1024 | *wstat = event_child->status_pending; | |
1025 | event_child->status_pending_p = 0; | |
1026 | event_child->status_pending = 0; | |
1027 | current_inferior = get_lwp_thread (event_child); | |
1028 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1029 | } |
1030 | ||
1031 | /* We only enter this loop if no process has a pending wait status. Thus | |
1032 | any action taken in response to a wait status inside this loop is | |
1033 | responding as soon as we detect the status, not after any pending | |
1034 | events. */ | |
1035 | while (1) | |
1036 | { | |
95954743 | 1037 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1038 | |
bd99dc85 PA |
1039 | if ((options & WNOHANG) && event_child == NULL) |
1040 | return 0; | |
0d62e5e8 DJ |
1041 | |
1042 | if (event_child == NULL) | |
1043 | error ("event from unknown child"); | |
611cb4a5 | 1044 | |
bd99dc85 | 1045 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1046 | |
89be2091 | 1047 | /* Check for thread exit. */ |
bd99dc85 | 1048 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1049 | { |
89be2091 | 1050 | if (debug_threads) |
95954743 | 1051 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1052 | |
1053 | /* If the last thread is exiting, just return. */ | |
95954743 | 1054 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1055 | { |
1056 | if (debug_threads) | |
95954743 PA |
1057 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1058 | lwpid_of (event_child)); | |
bd99dc85 PA |
1059 | return lwpid_of (event_child); |
1060 | } | |
89be2091 | 1061 | |
bd99dc85 | 1062 | delete_lwp (event_child); |
89be2091 | 1063 | |
bd99dc85 PA |
1064 | if (!non_stop) |
1065 | { | |
1066 | current_inferior = (struct thread_info *) all_threads.head; | |
1067 | if (debug_threads) | |
1068 | fprintf (stderr, "Current inferior is now %ld\n", | |
1069 | lwpid_of (get_thread_lwp (current_inferior))); | |
1070 | } | |
1071 | else | |
1072 | { | |
1073 | current_inferior = NULL; | |
1074 | if (debug_threads) | |
1075 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1076 | } | |
89be2091 DJ |
1077 | |
1078 | /* If we were waiting for this particular child to do something... | |
1079 | well, it did something. */ | |
bd99dc85 | 1080 | if (requested_child != NULL) |
95954743 | 1081 | return lwpid_of (event_child); |
89be2091 DJ |
1082 | |
1083 | /* Wait for a more interesting event. */ | |
1084 | continue; | |
1085 | } | |
1086 | ||
a6dbe5df PA |
1087 | if (event_child->must_set_ptrace_flags) |
1088 | { | |
1089 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
1090 | 0, PTRACE_O_TRACECLONE); | |
1091 | event_child->must_set_ptrace_flags = 0; | |
1092 | } | |
1093 | ||
bd99dc85 PA |
1094 | if (WIFSTOPPED (*wstat) |
1095 | && WSTOPSIG (*wstat) == SIGSTOP | |
89be2091 DJ |
1096 | && event_child->stop_expected) |
1097 | { | |
1098 | if (debug_threads) | |
1099 | fprintf (stderr, "Expected stop.\n"); | |
1100 | event_child->stop_expected = 0; | |
2acc282a | 1101 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
89be2091 DJ |
1102 | continue; |
1103 | } | |
1104 | ||
bd99dc85 PA |
1105 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1106 | && *wstat >> 16 != 0) | |
24a09b5f | 1107 | { |
bd99dc85 | 1108 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1109 | continue; |
1110 | } | |
1111 | ||
89be2091 DJ |
1112 | /* If GDB is not interested in this signal, don't stop other |
1113 | threads, and don't report it to GDB. Just resume the | |
1114 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1115 | signals as well as any that GDB specifically requested we |
1116 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1117 | and do not ignore signals when stepping - they may require | |
1118 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1119 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1120 | thread library? */ | |
bd99dc85 | 1121 | if (WIFSTOPPED (*wstat) |
69f223ed | 1122 | && !event_child->stepping |
24a09b5f DJ |
1123 | && ( |
1124 | #ifdef USE_THREAD_DB | |
95954743 | 1125 | (current_process ()->private->thread_db_active |
bd99dc85 PA |
1126 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1127 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1128 | || |
1129 | #endif | |
bd99dc85 PA |
1130 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
1131 | && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
1132 | { |
1133 | siginfo_t info, *info_p; | |
1134 | ||
1135 | if (debug_threads) | |
24a09b5f | 1136 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1137 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1138 | |
bd99dc85 | 1139 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1140 | info_p = &info; |
1141 | else | |
1142 | info_p = NULL; | |
2acc282a | 1143 | linux_resume_one_lwp (event_child, |
54a0b537 | 1144 | event_child->stepping, |
bd99dc85 | 1145 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1146 | continue; |
0d62e5e8 | 1147 | } |
611cb4a5 | 1148 | |
0d62e5e8 DJ |
1149 | /* If this event was not handled above, and is not a SIGTRAP, report |
1150 | it. */ | |
bd99dc85 PA |
1151 | if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP) |
1152 | return lwpid_of (event_child); | |
611cb4a5 | 1153 | |
0d62e5e8 DJ |
1154 | /* If this target does not support breakpoints, we simply report the |
1155 | SIGTRAP; it's of no concern to us. */ | |
1156 | if (the_low_target.get_pc == NULL) | |
bd99dc85 | 1157 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1158 | |
1159 | stop_pc = get_stop_pc (); | |
1160 | ||
1161 | /* bp_reinsert will only be set if we were single-stepping. | |
1162 | Notice that we will resume the process after hitting | |
1163 | a gdbserver breakpoint; single-stepping to/over one | |
1164 | is not supported (yet). */ | |
1165 | if (event_child->bp_reinsert != 0) | |
1166 | { | |
1167 | if (debug_threads) | |
1168 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
1169 | reinsert_breakpoint (event_child->bp_reinsert); | |
1170 | event_child->bp_reinsert = 0; | |
1171 | ||
1172 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
2acc282a | 1173 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
0d62e5e8 DJ |
1174 | continue; |
1175 | } | |
1176 | ||
b65d95c5 | 1177 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 1178 | |
b65d95c5 | 1179 | if (bp_status != 0) |
0d62e5e8 | 1180 | { |
b65d95c5 DJ |
1181 | if (debug_threads) |
1182 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1183 | ||
0d62e5e8 | 1184 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 1185 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
1186 | adjustment for us at the appropriate time. */ |
1187 | event_child->pending_is_breakpoint = 1; | |
1188 | event_child->pending_stop_pc = stop_pc; | |
1189 | ||
b65d95c5 | 1190 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
1191 | loop instead of simply replacing the breakpoint right away, |
1192 | in order to not lose signals sent to the thread that hit the | |
1193 | breakpoint. Unfortunately this increases the window where another | |
1194 | thread could sneak past the removed breakpoint. For the current | |
1195 | use of server-side breakpoints (thread creation) this is | |
1196 | acceptable; but it needs to be considered before this breakpoint | |
1197 | mechanism can be used in more general ways. For some breakpoints | |
1198 | it may be necessary to stop all other threads, but that should | |
1199 | be avoided where possible. | |
1200 | ||
1201 | If breakpoint_reinsert_addr is NULL, that means that we can | |
1202 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
1203 | mark it for reinsertion, and single-step. | |
1204 | ||
1205 | Otherwise, call the target function to figure out where we need | |
1206 | our temporary breakpoint, create it, and continue executing this | |
1207 | process. */ | |
bd99dc85 PA |
1208 | |
1209 | /* NOTE: we're lifting breakpoints in non-stop mode. This | |
1210 | is currently only used for thread event breakpoints, so | |
1211 | it isn't that bad as long as we have PTRACE_EVENT_CLONE | |
1212 | events. */ | |
b65d95c5 DJ |
1213 | if (bp_status == 2) |
1214 | /* No need to reinsert. */ | |
2acc282a | 1215 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
b65d95c5 | 1216 | else if (the_low_target.breakpoint_reinsert_addr == NULL) |
0d62e5e8 DJ |
1217 | { |
1218 | event_child->bp_reinsert = stop_pc; | |
1219 | uninsert_breakpoint (stop_pc); | |
2acc282a | 1220 | linux_resume_one_lwp (event_child, 1, 0, NULL); |
0d62e5e8 DJ |
1221 | } |
1222 | else | |
1223 | { | |
1224 | reinsert_breakpoint_by_bp | |
1225 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
2acc282a | 1226 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
611cb4a5 | 1227 | } |
0d62e5e8 DJ |
1228 | |
1229 | continue; | |
1230 | } | |
1231 | ||
b65d95c5 DJ |
1232 | if (debug_threads) |
1233 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
1234 | ||
0d62e5e8 | 1235 | /* If we were single-stepping, we definitely want to report the |
c35fafde PA |
1236 | SIGTRAP. Although the single-step operation has completed, |
1237 | do not clear clear the stepping flag yet; we need to check it | |
1238 | in wait_for_sigstop. */ | |
0d62e5e8 | 1239 | if (event_child->stepping) |
bd99dc85 | 1240 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1241 | |
1242 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
1243 | Check if it is a breakpoint, and if so mark the process information | |
1244 | accordingly. This will handle both the necessary fiddling with the | |
1245 | PC on decr_pc_after_break targets and suppressing extra threads | |
1246 | hitting a breakpoint if two hit it at once and then GDB removes it | |
1247 | after the first is reported. Arguably it would be better to report | |
1248 | multiple threads hitting breakpoints simultaneously, but the current | |
1249 | remote protocol does not allow this. */ | |
1250 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
1251 | { | |
1252 | event_child->pending_is_breakpoint = 1; | |
1253 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
1254 | } |
1255 | ||
bd99dc85 | 1256 | return lwpid_of (event_child); |
611cb4a5 | 1257 | } |
0d62e5e8 | 1258 | |
611cb4a5 DJ |
1259 | /* NOTREACHED */ |
1260 | return 0; | |
1261 | } | |
1262 | ||
95954743 PA |
1263 | static int |
1264 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1265 | { | |
1266 | ptid_t wait_ptid; | |
1267 | ||
1268 | if (ptid_is_pid (ptid)) | |
1269 | { | |
1270 | /* A request to wait for a specific tgid. This is not possible | |
1271 | with waitpid, so instead, we wait for any child, and leave | |
1272 | children we're not interested in right now with a pending | |
1273 | status to report later. */ | |
1274 | wait_ptid = minus_one_ptid; | |
1275 | } | |
1276 | else | |
1277 | wait_ptid = ptid; | |
1278 | ||
1279 | while (1) | |
1280 | { | |
1281 | int event_pid; | |
1282 | ||
1283 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1284 | ||
1285 | if (event_pid > 0 | |
1286 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1287 | { | |
1288 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1289 | ||
1290 | if (! WIFSTOPPED (*wstat)) | |
1291 | mark_lwp_dead (event_child, *wstat); | |
1292 | else | |
1293 | { | |
1294 | event_child->status_pending_p = 1; | |
1295 | event_child->status_pending = *wstat; | |
1296 | } | |
1297 | } | |
1298 | else | |
1299 | return event_pid; | |
1300 | } | |
1301 | } | |
1302 | ||
0d62e5e8 | 1303 | /* Wait for process, returns status. */ |
da6d8c04 | 1304 | |
95954743 PA |
1305 | static ptid_t |
1306 | linux_wait_1 (ptid_t ptid, | |
1307 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1308 | { |
e5f1222d | 1309 | int w; |
bd99dc85 PA |
1310 | struct thread_info *thread = NULL; |
1311 | struct lwp_info *lwp = NULL; | |
1312 | int options; | |
bd99dc85 PA |
1313 | int pid; |
1314 | ||
1315 | /* Translate generic target options into linux options. */ | |
1316 | options = __WALL; | |
1317 | if (target_options & TARGET_WNOHANG) | |
1318 | options |= WNOHANG; | |
0d62e5e8 DJ |
1319 | |
1320 | retry: | |
bd99dc85 PA |
1321 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1322 | ||
0d62e5e8 DJ |
1323 | /* If we were only supposed to resume one thread, only wait for |
1324 | that thread - if it's still alive. If it died, however - which | |
1325 | can happen if we're coming from the thread death case below - | |
1326 | then we need to make sure we restart the other threads. We could | |
1327 | pick a thread at random or restart all; restarting all is less | |
1328 | arbitrary. */ | |
95954743 PA |
1329 | if (!non_stop |
1330 | && !ptid_equal (cont_thread, null_ptid) | |
1331 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1332 | { |
bd99dc85 PA |
1333 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1334 | cont_thread); | |
0d62e5e8 DJ |
1335 | |
1336 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1337 | if (thread == NULL) |
64386c31 DJ |
1338 | { |
1339 | struct thread_resume resume_info; | |
95954743 | 1340 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1341 | resume_info.kind = resume_continue; |
1342 | resume_info.sig = 0; | |
2bd7c093 | 1343 | linux_resume (&resume_info, 1); |
64386c31 | 1344 | } |
bd99dc85 | 1345 | else |
95954743 | 1346 | ptid = cont_thread; |
0d62e5e8 | 1347 | } |
da6d8c04 | 1348 | |
95954743 | 1349 | pid = linux_wait_for_event (ptid, &w, options); |
bd99dc85 | 1350 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1351 | return null_ptid; |
bd99dc85 PA |
1352 | |
1353 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1354 | |
0d62e5e8 DJ |
1355 | /* If we are waiting for a particular child, and it exited, |
1356 | linux_wait_for_event will return its exit status. Similarly if | |
1357 | the last child exited. If this is not the last child, however, | |
1358 | do not report it as exited until there is a 'thread exited' response | |
1359 | available in the remote protocol. Instead, just wait for another event. | |
1360 | This should be safe, because if the thread crashed we will already | |
1361 | have reported the termination signal to GDB; that should stop any | |
1362 | in-progress stepping operations, etc. | |
1363 | ||
1364 | Report the exit status of the last thread to exit. This matches | |
1365 | LinuxThreads' behavior. */ | |
1366 | ||
95954743 | 1367 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1368 | { |
bd99dc85 | 1369 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1370 | { |
95954743 PA |
1371 | int pid = pid_of (lwp); |
1372 | struct process_info *process = find_process_pid (pid); | |
5b1c542e | 1373 | |
bd99dc85 | 1374 | delete_lwp (lwp); |
5091eb23 | 1375 | linux_remove_process (process); |
5b1c542e | 1376 | |
bd99dc85 | 1377 | current_inferior = NULL; |
5b1c542e | 1378 | |
bd99dc85 PA |
1379 | if (WIFEXITED (w)) |
1380 | { | |
1381 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1382 | ourstatus->value.integer = WEXITSTATUS (w); | |
1383 | ||
1384 | if (debug_threads) | |
1385 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1386 | } | |
1387 | else | |
1388 | { | |
1389 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1390 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1391 | ||
1392 | if (debug_threads) | |
1393 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1394 | ||
1395 | } | |
5b1c542e | 1396 | |
95954743 | 1397 | return pid_to_ptid (pid); |
0d62e5e8 | 1398 | } |
da6d8c04 | 1399 | } |
0d62e5e8 | 1400 | else |
da6d8c04 | 1401 | { |
0d62e5e8 DJ |
1402 | if (!WIFSTOPPED (w)) |
1403 | goto retry; | |
da6d8c04 DJ |
1404 | } |
1405 | ||
bd99dc85 PA |
1406 | /* In all-stop, stop all threads. Be careful to only do this if |
1407 | we're about to report an event to GDB. */ | |
1408 | if (!non_stop) | |
1409 | stop_all_lwps (); | |
1410 | ||
5b1c542e | 1411 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1412 | |
bd99dc85 PA |
1413 | if (lwp->suspended && WSTOPSIG (w) == SIGSTOP) |
1414 | { | |
1415 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1416 | and it stopped cleanly, so report as SIG0. The use of | |
1417 | SIGSTOP is an implementation detail. */ | |
1418 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1419 | } | |
1420 | else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP) | |
1421 | { | |
1422 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1423 | but, it stopped for other reasons. Set stop_expected so the | |
1424 | pending SIGSTOP is ignored and the LWP is resumed. */ | |
1425 | lwp->stop_expected = 1; | |
1426 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1427 | } | |
1428 | else | |
1429 | { | |
1430 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1431 | } | |
1432 | ||
1433 | if (debug_threads) | |
95954743 PA |
1434 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
1435 | target_pid_to_str (lwp->head.id), | |
bd99dc85 PA |
1436 | ourstatus->kind, |
1437 | ourstatus->value.sig); | |
1438 | ||
95954743 | 1439 | return lwp->head.id; |
bd99dc85 PA |
1440 | } |
1441 | ||
1442 | /* Get rid of any pending event in the pipe. */ | |
1443 | static void | |
1444 | async_file_flush (void) | |
1445 | { | |
1446 | int ret; | |
1447 | char buf; | |
1448 | ||
1449 | do | |
1450 | ret = read (linux_event_pipe[0], &buf, 1); | |
1451 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1452 | } | |
1453 | ||
1454 | /* Put something in the pipe, so the event loop wakes up. */ | |
1455 | static void | |
1456 | async_file_mark (void) | |
1457 | { | |
1458 | int ret; | |
1459 | ||
1460 | async_file_flush (); | |
1461 | ||
1462 | do | |
1463 | ret = write (linux_event_pipe[1], "+", 1); | |
1464 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1465 | ||
1466 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1467 | be awakened anyway. */ | |
1468 | } | |
1469 | ||
95954743 PA |
1470 | static ptid_t |
1471 | linux_wait (ptid_t ptid, | |
1472 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1473 | { |
95954743 | 1474 | ptid_t event_ptid; |
bd99dc85 PA |
1475 | |
1476 | if (debug_threads) | |
95954743 | 1477 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1478 | |
1479 | /* Flush the async file first. */ | |
1480 | if (target_is_async_p ()) | |
1481 | async_file_flush (); | |
1482 | ||
95954743 | 1483 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1484 | |
1485 | /* If at least one stop was reported, there may be more. A single | |
1486 | SIGCHLD can signal more than one child stop. */ | |
1487 | if (target_is_async_p () | |
1488 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1489 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1490 | async_file_mark (); |
1491 | ||
1492 | return event_ptid; | |
da6d8c04 DJ |
1493 | } |
1494 | ||
fd500816 DJ |
1495 | /* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if |
1496 | thread groups are in use, we need to use tkill. */ | |
1497 | ||
1498 | static int | |
a1928bad | 1499 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 DJ |
1500 | { |
1501 | static int tkill_failed; | |
1502 | ||
1503 | errno = 0; | |
1504 | ||
1505 | #ifdef SYS_tkill | |
1506 | if (!tkill_failed) | |
1507 | { | |
1508 | int ret = syscall (SYS_tkill, lwpid, signo); | |
1509 | if (errno != ENOSYS) | |
1b3f6016 | 1510 | return ret; |
fd500816 DJ |
1511 | errno = 0; |
1512 | tkill_failed = 1; | |
1513 | } | |
1514 | #endif | |
1515 | ||
1516 | return kill (lwpid, signo); | |
1517 | } | |
1518 | ||
0d62e5e8 DJ |
1519 | static void |
1520 | send_sigstop (struct inferior_list_entry *entry) | |
1521 | { | |
54a0b537 | 1522 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1523 | int pid; |
0d62e5e8 | 1524 | |
54a0b537 | 1525 | if (lwp->stopped) |
0d62e5e8 DJ |
1526 | return; |
1527 | ||
bd99dc85 PA |
1528 | pid = lwpid_of (lwp); |
1529 | ||
0d62e5e8 DJ |
1530 | /* If we already have a pending stop signal for this process, don't |
1531 | send another. */ | |
54a0b537 | 1532 | if (lwp->stop_expected) |
0d62e5e8 | 1533 | { |
ae13219e | 1534 | if (debug_threads) |
bd99dc85 | 1535 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e DJ |
1536 | |
1537 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1538 | will receive the SIGSTOP event (instead of silently resuming and | |
1539 | waiting again). It'll be reset below. */ | |
54a0b537 | 1540 | lwp->stop_expected = 0; |
0d62e5e8 DJ |
1541 | return; |
1542 | } | |
1543 | ||
1544 | if (debug_threads) | |
bd99dc85 | 1545 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1546 | |
bd99dc85 | 1547 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1548 | } |
1549 | ||
95954743 PA |
1550 | static void |
1551 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
1552 | { | |
1553 | /* It's dead, really. */ | |
1554 | lwp->dead = 1; | |
1555 | ||
1556 | /* Store the exit status for later. */ | |
1557 | lwp->status_pending_p = 1; | |
1558 | lwp->status_pending = wstat; | |
1559 | ||
1560 | /* So that check_removed_breakpoint doesn't try to figure out if | |
1561 | this is stopped at a breakpoint. */ | |
1562 | lwp->pending_is_breakpoint = 0; | |
1563 | ||
1564 | /* Prevent trying to stop it. */ | |
1565 | lwp->stopped = 1; | |
1566 | ||
1567 | /* No further stops are expected from a dead lwp. */ | |
1568 | lwp->stop_expected = 0; | |
1569 | } | |
1570 | ||
0d62e5e8 DJ |
1571 | static void |
1572 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1573 | { | |
54a0b537 | 1574 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1575 | struct thread_info *saved_inferior; |
a1928bad | 1576 | int wstat; |
95954743 PA |
1577 | ptid_t saved_tid; |
1578 | ptid_t ptid; | |
0d62e5e8 | 1579 | |
54a0b537 | 1580 | if (lwp->stopped) |
0d62e5e8 DJ |
1581 | return; |
1582 | ||
1583 | saved_inferior = current_inferior; | |
bd99dc85 PA |
1584 | if (saved_inferior != NULL) |
1585 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1586 | else | |
95954743 | 1587 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 1588 | |
95954743 | 1589 | ptid = lwp->head.id; |
bd99dc85 PA |
1590 | |
1591 | linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
1592 | |
1593 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1594 | and record the pending SIGSTOP. If the process exited, just | |
1595 | return. */ | |
1596 | if (WIFSTOPPED (wstat) | |
1597 | && WSTOPSIG (wstat) != SIGSTOP) | |
1598 | { | |
1599 | if (debug_threads) | |
24a09b5f | 1600 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
bd99dc85 | 1601 | lwpid_of (lwp), wstat); |
c35fafde PA |
1602 | |
1603 | /* Do not leave a pending single-step finish to be reported to | |
1604 | the client. The client will give us a new action for this | |
1605 | thread, possibly a continue request --- otherwise, the client | |
1606 | would consider this pending SIGTRAP reported later a spurious | |
1607 | signal. */ | |
1608 | if (WSTOPSIG (wstat) == SIGTRAP | |
1609 | && lwp->stepping | |
1610 | && !linux_stopped_by_watchpoint ()) | |
1611 | { | |
1612 | if (debug_threads) | |
1613 | fprintf (stderr, " single-step SIGTRAP ignored\n"); | |
1614 | } | |
1615 | else | |
1616 | { | |
1617 | lwp->status_pending_p = 1; | |
1618 | lwp->status_pending = wstat; | |
1619 | } | |
54a0b537 | 1620 | lwp->stop_expected = 1; |
0d62e5e8 | 1621 | } |
95954743 PA |
1622 | else if (!WIFSTOPPED (wstat)) |
1623 | { | |
1624 | if (debug_threads) | |
1625 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
1626 | lwpid_of (lwp)); | |
1627 | ||
1628 | /* Leave this status pending for the next time we're able to | |
1629 | report it. In the mean time, we'll report this lwp as dead | |
1630 | to GDB, so GDB doesn't try to read registers and memory from | |
1631 | it. */ | |
1632 | mark_lwp_dead (lwp, wstat); | |
1633 | } | |
0d62e5e8 | 1634 | |
bd99dc85 | 1635 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
1636 | current_inferior = saved_inferior; |
1637 | else | |
1638 | { | |
1639 | if (debug_threads) | |
1640 | fprintf (stderr, "Previously current thread died.\n"); | |
1641 | ||
bd99dc85 PA |
1642 | if (non_stop) |
1643 | { | |
1644 | /* We can't change the current inferior behind GDB's back, | |
1645 | otherwise, a subsequent command may apply to the wrong | |
1646 | process. */ | |
1647 | current_inferior = NULL; | |
1648 | } | |
1649 | else | |
1650 | { | |
1651 | /* Set a valid thread as current. */ | |
1652 | set_desired_inferior (0); | |
1653 | } | |
0d62e5e8 DJ |
1654 | } |
1655 | } | |
1656 | ||
1657 | static void | |
54a0b537 | 1658 | stop_all_lwps (void) |
0d62e5e8 DJ |
1659 | { |
1660 | stopping_threads = 1; | |
54a0b537 PA |
1661 | for_each_inferior (&all_lwps, send_sigstop); |
1662 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
1663 | stopping_threads = 0; |
1664 | } | |
1665 | ||
da6d8c04 DJ |
1666 | /* Resume execution of the inferior process. |
1667 | If STEP is nonzero, single-step it. | |
1668 | If SIGNAL is nonzero, give it that signal. */ | |
1669 | ||
ce3a066d | 1670 | static void |
2acc282a | 1671 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 1672 | int step, int signal, siginfo_t *info) |
da6d8c04 | 1673 | { |
0d62e5e8 DJ |
1674 | struct thread_info *saved_inferior; |
1675 | ||
54a0b537 | 1676 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
1677 | return; |
1678 | ||
1679 | /* If we have pending signals or status, and a new signal, enqueue the | |
1680 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1681 | breakpoint; it will be picked up again below. */ | |
1682 | if (signal != 0 | |
54a0b537 PA |
1683 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
1684 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
1685 | { |
1686 | struct pending_signals *p_sig; | |
bca929d3 | 1687 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 1688 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 1689 | p_sig->signal = signal; |
32ca6d61 DJ |
1690 | if (info == NULL) |
1691 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1692 | else | |
1693 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 1694 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
1695 | } |
1696 | ||
54a0b537 | 1697 | if (lwp->status_pending_p && !check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
1698 | return; |
1699 | ||
1700 | saved_inferior = current_inferior; | |
54a0b537 | 1701 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
1702 | |
1703 | if (debug_threads) | |
1b3f6016 | 1704 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 1705 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 1706 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
1707 | |
1708 | /* This bit needs some thinking about. If we get a signal that | |
1709 | we must report while a single-step reinsert is still pending, | |
1710 | we often end up resuming the thread. It might be better to | |
1711 | (ew) allow a stack of pending events; then we could be sure that | |
1712 | the reinsert happened right away and not lose any signals. | |
1713 | ||
1714 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 1715 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
1716 | complete correctness, so it won't solve that problem. It may be |
1717 | worthwhile just to solve this one, however. */ | |
54a0b537 | 1718 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
1719 | { |
1720 | if (debug_threads) | |
54a0b537 | 1721 | fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert); |
0d62e5e8 DJ |
1722 | if (step == 0) |
1723 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1724 | step = 1; | |
1725 | ||
1726 | /* Postpone any pending signal. It was enqueued above. */ | |
1727 | signal = 0; | |
1728 | } | |
1729 | ||
54a0b537 | 1730 | check_removed_breakpoint (lwp); |
0d62e5e8 | 1731 | |
aa691b87 | 1732 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 1733 | { |
47c0c975 DE |
1734 | CORE_ADDR pc = (*the_low_target.get_pc) (); |
1735 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); | |
0d62e5e8 DJ |
1736 | } |
1737 | ||
1738 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1739 | a breakpoint. */ | |
54a0b537 | 1740 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
1741 | { |
1742 | struct pending_signals **p_sig; | |
1743 | ||
54a0b537 | 1744 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
1745 | while ((*p_sig)->prev != NULL) |
1746 | p_sig = &(*p_sig)->prev; | |
1747 | ||
1748 | signal = (*p_sig)->signal; | |
32ca6d61 | 1749 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 1750 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 1751 | |
0d62e5e8 DJ |
1752 | free (*p_sig); |
1753 | *p_sig = NULL; | |
1754 | } | |
1755 | ||
aa5ca48f DE |
1756 | if (the_low_target.prepare_to_resume != NULL) |
1757 | the_low_target.prepare_to_resume (lwp); | |
1758 | ||
0d62e5e8 | 1759 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 1760 | get_lwp_thread (lwp)); |
da6d8c04 | 1761 | errno = 0; |
54a0b537 PA |
1762 | lwp->stopped = 0; |
1763 | lwp->stepping = step; | |
bd99dc85 | 1764 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal); |
0d62e5e8 DJ |
1765 | |
1766 | current_inferior = saved_inferior; | |
da6d8c04 | 1767 | if (errno) |
3221518c UW |
1768 | { |
1769 | /* ESRCH from ptrace either means that the thread was already | |
1770 | running (an error) or that it is gone (a race condition). If | |
1771 | it's gone, we will get a notification the next time we wait, | |
1772 | so we can ignore the error. We could differentiate these | |
1773 | two, but it's tricky without waiting; the thread still exists | |
1774 | as a zombie, so sending it signal 0 would succeed. So just | |
1775 | ignore ESRCH. */ | |
1776 | if (errno == ESRCH) | |
1777 | return; | |
1778 | ||
1779 | perror_with_name ("ptrace"); | |
1780 | } | |
da6d8c04 DJ |
1781 | } |
1782 | ||
2bd7c093 PA |
1783 | struct thread_resume_array |
1784 | { | |
1785 | struct thread_resume *resume; | |
1786 | size_t n; | |
1787 | }; | |
64386c31 DJ |
1788 | |
1789 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1790 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1791 | resume request. | |
1792 | ||
1793 | This algorithm is O(threads * resume elements), but resume elements | |
1794 | is small (and will remain small at least until GDB supports thread | |
1795 | suspension). */ | |
2bd7c093 PA |
1796 | static int |
1797 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 1798 | { |
54a0b537 | 1799 | struct lwp_info *lwp; |
64386c31 | 1800 | struct thread_info *thread; |
5544ad89 | 1801 | int ndx; |
2bd7c093 | 1802 | struct thread_resume_array *r; |
64386c31 DJ |
1803 | |
1804 | thread = (struct thread_info *) entry; | |
54a0b537 | 1805 | lwp = get_thread_lwp (thread); |
2bd7c093 | 1806 | r = arg; |
64386c31 | 1807 | |
2bd7c093 | 1808 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
1809 | { |
1810 | ptid_t ptid = r->resume[ndx].thread; | |
1811 | if (ptid_equal (ptid, minus_one_ptid) | |
1812 | || ptid_equal (ptid, entry->id) | |
1813 | || (ptid_is_pid (ptid) | |
1814 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
1815 | || (ptid_get_lwp (ptid) == -1 | |
1816 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
1817 | { | |
1818 | lwp->resume = &r->resume[ndx]; | |
1819 | return 0; | |
1820 | } | |
1821 | } | |
2bd7c093 PA |
1822 | |
1823 | /* No resume action for this thread. */ | |
1824 | lwp->resume = NULL; | |
64386c31 | 1825 | |
2bd7c093 | 1826 | return 0; |
5544ad89 DJ |
1827 | } |
1828 | ||
5544ad89 | 1829 | |
bd99dc85 PA |
1830 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
1831 | static int | |
1832 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 1833 | { |
bd99dc85 | 1834 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 1835 | |
bd99dc85 PA |
1836 | /* LWPs which will not be resumed are not interesting, because |
1837 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 1838 | if (lwp->resume == NULL) |
bd99dc85 | 1839 | return 0; |
64386c31 | 1840 | |
bd99dc85 PA |
1841 | /* If this thread has a removed breakpoint, we won't have any |
1842 | events to report later, so check now. check_removed_breakpoint | |
1843 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1844 | for any thread that we are not otherwise going to resume - this | |
1845 | lets us preserve stopped status when two threads hit a breakpoint. | |
1846 | GDB removes the breakpoint to single-step a particular thread | |
1847 | past it, then re-inserts it and resumes all threads. We want | |
1848 | to report the second thread without resuming it in the interim. */ | |
1849 | if (lwp->status_pending_p) | |
1850 | check_removed_breakpoint (lwp); | |
5544ad89 | 1851 | |
bd99dc85 PA |
1852 | if (lwp->status_pending_p) |
1853 | * (int *) flag_p = 1; | |
c6ecbae5 | 1854 | |
bd99dc85 | 1855 | return 0; |
5544ad89 DJ |
1856 | } |
1857 | ||
1858 | /* This function is called once per thread. We check the thread's resume | |
1859 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 1860 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 1861 | |
bd99dc85 PA |
1862 | For threads which we aren't explicitly told otherwise, we preserve |
1863 | the stepping flag; this is used for stepping over gdbserver-placed | |
1864 | breakpoints. | |
1865 | ||
1866 | If pending_flags was set in any thread, we queue any needed | |
1867 | signals, since we won't actually resume. We already have a pending | |
1868 | event to report, so we don't need to preserve any step requests; | |
1869 | they should be re-issued if necessary. */ | |
1870 | ||
1871 | static int | |
1872 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 1873 | { |
54a0b537 | 1874 | struct lwp_info *lwp; |
5544ad89 | 1875 | struct thread_info *thread; |
bd99dc85 PA |
1876 | int step; |
1877 | int pending_flag = * (int *) arg; | |
5544ad89 DJ |
1878 | |
1879 | thread = (struct thread_info *) entry; | |
54a0b537 | 1880 | lwp = get_thread_lwp (thread); |
5544ad89 | 1881 | |
2bd7c093 | 1882 | if (lwp->resume == NULL) |
bd99dc85 | 1883 | return 0; |
5544ad89 | 1884 | |
bd99dc85 | 1885 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 1886 | { |
bd99dc85 PA |
1887 | if (debug_threads) |
1888 | fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp)); | |
1889 | ||
1890 | if (!lwp->stopped) | |
1891 | { | |
1892 | if (debug_threads) | |
95954743 | 1893 | fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
1894 | |
1895 | lwp->suspended = 1; | |
1896 | send_sigstop (&lwp->head); | |
1897 | } | |
1898 | else | |
1899 | { | |
1900 | if (debug_threads) | |
1901 | { | |
1902 | if (lwp->suspended) | |
1903 | fprintf (stderr, "already stopped/suspended LWP %ld\n", | |
1904 | lwpid_of (lwp)); | |
1905 | else | |
1906 | fprintf (stderr, "already stopped/not suspended LWP %ld\n", | |
1907 | lwpid_of (lwp)); | |
1908 | } | |
32ca6d61 | 1909 | |
bd99dc85 PA |
1910 | /* Make sure we leave the LWP suspended, so we don't try to |
1911 | resume it without GDB telling us to. FIXME: The LWP may | |
1912 | have been stopped in an internal event that was not meant | |
1913 | to be notified back to GDB (e.g., gdbserver breakpoint), | |
1914 | so we should be reporting a stop event in that case | |
1915 | too. */ | |
1916 | lwp->suspended = 1; | |
1917 | } | |
32ca6d61 | 1918 | |
bd99dc85 PA |
1919 | /* For stop requests, we're done. */ |
1920 | lwp->resume = NULL; | |
1921 | return 0; | |
5544ad89 | 1922 | } |
bd99dc85 PA |
1923 | else |
1924 | lwp->suspended = 0; | |
5544ad89 | 1925 | |
bd99dc85 PA |
1926 | /* If this thread which is about to be resumed has a pending status, |
1927 | then don't resume any threads - we can just report the pending | |
1928 | status. Make sure to queue any signals that would otherwise be | |
1929 | sent. In all-stop mode, we do this decision based on if *any* | |
1930 | thread has a pending status. */ | |
1931 | if (non_stop) | |
1932 | resume_status_pending_p (&lwp->head, &pending_flag); | |
5544ad89 | 1933 | |
bd99dc85 PA |
1934 | if (!pending_flag) |
1935 | { | |
1936 | if (debug_threads) | |
1937 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 1938 | |
95954743 | 1939 | if (ptid_equal (lwp->resume->thread, minus_one_ptid) |
bd99dc85 PA |
1940 | && lwp->stepping |
1941 | && lwp->pending_is_breakpoint) | |
1942 | step = 1; | |
1943 | else | |
1944 | step = (lwp->resume->kind == resume_step); | |
5544ad89 | 1945 | |
2acc282a | 1946 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
1947 | } |
1948 | else | |
1949 | { | |
1950 | if (debug_threads) | |
1951 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 1952 | |
bd99dc85 PA |
1953 | /* If we have a new signal, enqueue the signal. */ |
1954 | if (lwp->resume->sig != 0) | |
1955 | { | |
1956 | struct pending_signals *p_sig; | |
1957 | p_sig = xmalloc (sizeof (*p_sig)); | |
1958 | p_sig->prev = lwp->pending_signals; | |
1959 | p_sig->signal = lwp->resume->sig; | |
1960 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1961 | ||
1962 | /* If this is the same signal we were previously stopped by, | |
1963 | make sure to queue its siginfo. We can ignore the return | |
1964 | value of ptrace; if it fails, we'll skip | |
1965 | PTRACE_SETSIGINFO. */ | |
1966 | if (WIFSTOPPED (lwp->last_status) | |
1967 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
1968 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1969 | ||
1970 | lwp->pending_signals = p_sig; | |
1971 | } | |
1972 | } | |
5544ad89 | 1973 | |
bd99dc85 | 1974 | lwp->resume = NULL; |
5544ad89 | 1975 | return 0; |
0d62e5e8 DJ |
1976 | } |
1977 | ||
1978 | static void | |
2bd7c093 | 1979 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 1980 | { |
5544ad89 | 1981 | int pending_flag; |
2bd7c093 | 1982 | struct thread_resume_array array = { resume_info, n }; |
c6ecbae5 | 1983 | |
2bd7c093 | 1984 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 DJ |
1985 | |
1986 | /* If there is a thread which would otherwise be resumed, which | |
1987 | has a pending status, then don't resume any threads - we can just | |
1988 | report the pending status. Make sure to queue any signals | |
bd99dc85 PA |
1989 | that would otherwise be sent. In non-stop mode, we'll apply this |
1990 | logic to each thread individually. */ | |
5544ad89 | 1991 | pending_flag = 0; |
bd99dc85 PA |
1992 | if (!non_stop) |
1993 | find_inferior (&all_lwps, resume_status_pending_p, &pending_flag); | |
5544ad89 DJ |
1994 | |
1995 | if (debug_threads) | |
1996 | { | |
1997 | if (pending_flag) | |
1998 | fprintf (stderr, "Not resuming, pending status\n"); | |
1999 | else | |
2000 | fprintf (stderr, "Resuming, no pending status\n"); | |
2001 | } | |
2002 | ||
bd99dc85 | 2003 | find_inferior (&all_threads, linux_resume_one_thread, &pending_flag); |
0d62e5e8 DJ |
2004 | } |
2005 | ||
2006 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
2007 | |
2008 | int | |
0a30fbc4 | 2009 | register_addr (int regnum) |
da6d8c04 DJ |
2010 | { |
2011 | int addr; | |
2012 | ||
2ec06d2e | 2013 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
2014 | error ("Invalid register number %d.", regnum); |
2015 | ||
2ec06d2e | 2016 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2017 | |
2018 | return addr; | |
2019 | } | |
2020 | ||
58caa3dc | 2021 | /* Fetch one register. */ |
da6d8c04 DJ |
2022 | static void |
2023 | fetch_register (int regno) | |
2024 | { | |
2025 | CORE_ADDR regaddr; | |
48d93c75 | 2026 | int i, size; |
0d62e5e8 | 2027 | char *buf; |
95954743 | 2028 | int pid; |
da6d8c04 | 2029 | |
2ec06d2e | 2030 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2031 | return; |
2ec06d2e | 2032 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2033 | return; |
da6d8c04 | 2034 | |
0a30fbc4 DJ |
2035 | regaddr = register_addr (regno); |
2036 | if (regaddr == -1) | |
2037 | return; | |
95954743 PA |
2038 | |
2039 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2040 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2041 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2042 | buf = alloca (size); |
2043 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2044 | { |
2045 | errno = 0; | |
0d62e5e8 | 2046 | *(PTRACE_XFER_TYPE *) (buf + i) = |
95954743 | 2047 | ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
da6d8c04 DJ |
2048 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2049 | if (errno != 0) | |
2050 | { | |
2051 | /* Warning, not error, in case we are attached; sometimes the | |
2052 | kernel doesn't let us at the registers. */ | |
2053 | char *err = strerror (errno); | |
2054 | char *msg = alloca (strlen (err) + 128); | |
2055 | sprintf (msg, "reading register %d: %s", regno, err); | |
2056 | error (msg); | |
2057 | goto error_exit; | |
2058 | } | |
2059 | } | |
ee1a7ae4 UW |
2060 | |
2061 | if (the_low_target.supply_ptrace_register) | |
2062 | the_low_target.supply_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2063 | else |
2064 | supply_register (regno, buf); | |
0d62e5e8 | 2065 | |
da6d8c04 DJ |
2066 | error_exit:; |
2067 | } | |
2068 | ||
2069 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
2070 | static void |
2071 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 | 2072 | { |
4463ce24 | 2073 | if (regno == -1) |
2ec06d2e | 2074 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
2075 | fetch_register (regno); |
2076 | else | |
2077 | fetch_register (regno); | |
2078 | } | |
2079 | ||
2080 | /* Store our register values back into the inferior. | |
2081 | If REGNO is -1, do this for all registers. | |
2082 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
2083 | static void |
2084 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
2085 | { |
2086 | CORE_ADDR regaddr; | |
48d93c75 | 2087 | int i, size; |
0d62e5e8 | 2088 | char *buf; |
55ac2b99 | 2089 | int pid; |
da6d8c04 DJ |
2090 | |
2091 | if (regno >= 0) | |
2092 | { | |
2ec06d2e | 2093 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2094 | return; |
2095 | ||
bc1e36ca | 2096 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2097 | return; |
2098 | ||
2099 | regaddr = register_addr (regno); | |
2100 | if (regaddr == -1) | |
da6d8c04 | 2101 | return; |
da6d8c04 | 2102 | errno = 0; |
48d93c75 UW |
2103 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2104 | & - sizeof (PTRACE_XFER_TYPE); | |
2105 | buf = alloca (size); | |
2106 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2107 | |
2108 | if (the_low_target.collect_ptrace_register) | |
2109 | the_low_target.collect_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2110 | else |
2111 | collect_register (regno, buf); | |
ee1a7ae4 | 2112 | |
95954743 | 2113 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2114 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2115 | { |
0a30fbc4 | 2116 | errno = 0; |
95954743 | 2117 | ptrace (PTRACE_POKEUSER, pid, (PTRACE_ARG3_TYPE) regaddr, |
2ff29de4 | 2118 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
2119 | if (errno != 0) |
2120 | { | |
1b3f6016 PA |
2121 | /* At this point, ESRCH should mean the process is |
2122 | already gone, in which case we simply ignore attempts | |
2123 | to change its registers. See also the related | |
2124 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2125 | if (errno == ESRCH) |
2126 | return; | |
2127 | ||
bc1e36ca DJ |
2128 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
2129 | { | |
2130 | char *err = strerror (errno); | |
2131 | char *msg = alloca (strlen (err) + 128); | |
2132 | sprintf (msg, "writing register %d: %s", | |
2133 | regno, err); | |
2134 | error (msg); | |
2135 | return; | |
2136 | } | |
da6d8c04 | 2137 | } |
2ff29de4 | 2138 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2139 | } |
da6d8c04 DJ |
2140 | } |
2141 | else | |
2ec06d2e | 2142 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 2143 | usr_store_inferior_registers (regno); |
da6d8c04 | 2144 | } |
58caa3dc DJ |
2145 | #endif /* HAVE_LINUX_USRREGS */ |
2146 | ||
2147 | ||
2148 | ||
2149 | #ifdef HAVE_LINUX_REGSETS | |
2150 | ||
2151 | static int | |
0d62e5e8 | 2152 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
2153 | { |
2154 | struct regset_info *regset; | |
e9d25b98 | 2155 | int saw_general_regs = 0; |
95954743 | 2156 | int pid; |
58caa3dc DJ |
2157 | |
2158 | regset = target_regsets; | |
2159 | ||
95954743 | 2160 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2161 | while (regset->size >= 0) |
2162 | { | |
2163 | void *buf; | |
2164 | int res; | |
2165 | ||
52fa2412 | 2166 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2167 | { |
2168 | regset ++; | |
2169 | continue; | |
2170 | } | |
2171 | ||
bca929d3 | 2172 | buf = xmalloc (regset->size); |
dfb64f85 | 2173 | #ifndef __sparc__ |
95954743 | 2174 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2175 | #else |
95954743 | 2176 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2177 | #endif |
58caa3dc DJ |
2178 | if (res < 0) |
2179 | { | |
2180 | if (errno == EIO) | |
2181 | { | |
52fa2412 UW |
2182 | /* If we get EIO on a regset, do not try it again for |
2183 | this process. */ | |
2184 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2185 | free (buf); |
52fa2412 | 2186 | continue; |
58caa3dc DJ |
2187 | } |
2188 | else | |
2189 | { | |
0d62e5e8 | 2190 | char s[256]; |
95954743 PA |
2191 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
2192 | pid); | |
0d62e5e8 | 2193 | perror (s); |
58caa3dc DJ |
2194 | } |
2195 | } | |
e9d25b98 DJ |
2196 | else if (regset->type == GENERAL_REGS) |
2197 | saw_general_regs = 1; | |
58caa3dc DJ |
2198 | regset->store_function (buf); |
2199 | regset ++; | |
fdeb2a12 | 2200 | free (buf); |
58caa3dc | 2201 | } |
e9d25b98 DJ |
2202 | if (saw_general_regs) |
2203 | return 0; | |
2204 | else | |
2205 | return 1; | |
58caa3dc DJ |
2206 | } |
2207 | ||
2208 | static int | |
0d62e5e8 | 2209 | regsets_store_inferior_registers () |
58caa3dc DJ |
2210 | { |
2211 | struct regset_info *regset; | |
e9d25b98 | 2212 | int saw_general_regs = 0; |
95954743 | 2213 | int pid; |
58caa3dc DJ |
2214 | |
2215 | regset = target_regsets; | |
2216 | ||
95954743 | 2217 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2218 | while (regset->size >= 0) |
2219 | { | |
2220 | void *buf; | |
2221 | int res; | |
2222 | ||
52fa2412 | 2223 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2224 | { |
2225 | regset ++; | |
2226 | continue; | |
2227 | } | |
2228 | ||
bca929d3 | 2229 | buf = xmalloc (regset->size); |
545587ee DJ |
2230 | |
2231 | /* First fill the buffer with the current register set contents, | |
2232 | in case there are any items in the kernel's regset that are | |
2233 | not in gdbserver's regcache. */ | |
dfb64f85 | 2234 | #ifndef __sparc__ |
95954743 | 2235 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2236 | #else |
95954743 | 2237 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2238 | #endif |
545587ee DJ |
2239 | |
2240 | if (res == 0) | |
2241 | { | |
2242 | /* Then overlay our cached registers on that. */ | |
2243 | regset->fill_function (buf); | |
2244 | ||
2245 | /* Only now do we write the register set. */ | |
dfb64f85 | 2246 | #ifndef __sparc__ |
95954743 | 2247 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 2248 | #else |
95954743 | 2249 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 2250 | #endif |
545587ee DJ |
2251 | } |
2252 | ||
58caa3dc DJ |
2253 | if (res < 0) |
2254 | { | |
2255 | if (errno == EIO) | |
2256 | { | |
52fa2412 UW |
2257 | /* If we get EIO on a regset, do not try it again for |
2258 | this process. */ | |
2259 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2260 | free (buf); |
52fa2412 | 2261 | continue; |
58caa3dc | 2262 | } |
3221518c UW |
2263 | else if (errno == ESRCH) |
2264 | { | |
1b3f6016 PA |
2265 | /* At this point, ESRCH should mean the process is |
2266 | already gone, in which case we simply ignore attempts | |
2267 | to change its registers. See also the related | |
2268 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 2269 | free (buf); |
3221518c UW |
2270 | return 0; |
2271 | } | |
58caa3dc DJ |
2272 | else |
2273 | { | |
ce3a066d | 2274 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
2275 | } |
2276 | } | |
e9d25b98 DJ |
2277 | else if (regset->type == GENERAL_REGS) |
2278 | saw_general_regs = 1; | |
58caa3dc | 2279 | regset ++; |
09ec9b38 | 2280 | free (buf); |
58caa3dc | 2281 | } |
e9d25b98 DJ |
2282 | if (saw_general_regs) |
2283 | return 0; | |
2284 | else | |
2285 | return 1; | |
ce3a066d | 2286 | return 0; |
58caa3dc DJ |
2287 | } |
2288 | ||
2289 | #endif /* HAVE_LINUX_REGSETS */ | |
2290 | ||
2291 | ||
2292 | void | |
ce3a066d | 2293 | linux_fetch_registers (int regno) |
58caa3dc DJ |
2294 | { |
2295 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2296 | if (regsets_fetch_inferior_registers () == 0) |
2297 | return; | |
58caa3dc DJ |
2298 | #endif |
2299 | #ifdef HAVE_LINUX_USRREGS | |
2300 | usr_fetch_inferior_registers (regno); | |
2301 | #endif | |
2302 | } | |
2303 | ||
2304 | void | |
ce3a066d | 2305 | linux_store_registers (int regno) |
58caa3dc DJ |
2306 | { |
2307 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2308 | if (regsets_store_inferior_registers () == 0) |
2309 | return; | |
58caa3dc DJ |
2310 | #endif |
2311 | #ifdef HAVE_LINUX_USRREGS | |
2312 | usr_store_inferior_registers (regno); | |
2313 | #endif | |
2314 | } | |
2315 | ||
da6d8c04 | 2316 | |
da6d8c04 DJ |
2317 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
2318 | to debugger memory starting at MYADDR. */ | |
2319 | ||
c3e735a6 | 2320 | static int |
f450004a | 2321 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
2322 | { |
2323 | register int i; | |
2324 | /* Round starting address down to longword boundary. */ | |
2325 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2326 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
2327 | register int count |
2328 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
2329 | / sizeof (PTRACE_XFER_TYPE); |
2330 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 2331 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 2332 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
2333 | int fd; |
2334 | char filename[64]; | |
95954743 | 2335 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
2336 | |
2337 | /* Try using /proc. Don't bother for one word. */ | |
2338 | if (len >= 3 * sizeof (long)) | |
2339 | { | |
2340 | /* We could keep this file open and cache it - possibly one per | |
2341 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 2342 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
2343 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
2344 | if (fd == -1) | |
2345 | goto no_proc; | |
2346 | ||
2347 | /* If pread64 is available, use it. It's faster if the kernel | |
2348 | supports it (only one syscall), and it's 64-bit safe even on | |
2349 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
2350 | application). */ | |
2351 | #ifdef HAVE_PREAD64 | |
2352 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
2353 | #else | |
2354 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len) | |
2355 | #endif | |
2356 | { | |
2357 | close (fd); | |
2358 | goto no_proc; | |
2359 | } | |
2360 | ||
2361 | close (fd); | |
2362 | return 0; | |
2363 | } | |
da6d8c04 | 2364 | |
fd462a61 | 2365 | no_proc: |
da6d8c04 DJ |
2366 | /* Read all the longwords */ |
2367 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2368 | { | |
c3e735a6 | 2369 | errno = 0; |
95954743 | 2370 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
c3e735a6 DJ |
2371 | if (errno) |
2372 | return errno; | |
da6d8c04 DJ |
2373 | } |
2374 | ||
2375 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
2376 | memcpy (myaddr, |
2377 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
2378 | len); | |
c3e735a6 DJ |
2379 | |
2380 | return 0; | |
da6d8c04 DJ |
2381 | } |
2382 | ||
2383 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
2384 | to inferior's memory at MEMADDR. | |
2385 | On failure (cannot write the inferior) | |
2386 | returns the value of errno. */ | |
2387 | ||
ce3a066d | 2388 | static int |
f450004a | 2389 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
2390 | { |
2391 | register int i; | |
2392 | /* Round starting address down to longword boundary. */ | |
2393 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2394 | /* Round ending address up; get number of longwords that makes. */ | |
2395 | register int count | |
2396 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
2397 | /* Allocate buffer of that many longwords. */ | |
2398 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 2399 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 2400 | |
0d62e5e8 DJ |
2401 | if (debug_threads) |
2402 | { | |
58d6951d DJ |
2403 | /* Dump up to four bytes. */ |
2404 | unsigned int val = * (unsigned int *) myaddr; | |
2405 | if (len == 1) | |
2406 | val = val & 0xff; | |
2407 | else if (len == 2) | |
2408 | val = val & 0xffff; | |
2409 | else if (len == 3) | |
2410 | val = val & 0xffffff; | |
2411 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
2412 | val, (long)memaddr); | |
0d62e5e8 DJ |
2413 | } |
2414 | ||
da6d8c04 DJ |
2415 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
2416 | ||
95954743 | 2417 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
da6d8c04 DJ |
2418 | |
2419 | if (count > 1) | |
2420 | { | |
2421 | buffer[count - 1] | |
95954743 | 2422 | = ptrace (PTRACE_PEEKTEXT, pid, |
d844cde6 DJ |
2423 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
2424 | * sizeof (PTRACE_XFER_TYPE)), | |
2425 | 0); | |
da6d8c04 DJ |
2426 | } |
2427 | ||
2428 | /* Copy data to be written over corresponding part of buffer */ | |
2429 | ||
2430 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
2431 | ||
2432 | /* Write the entire buffer. */ | |
2433 | ||
2434 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2435 | { | |
2436 | errno = 0; | |
95954743 | 2437 | ptrace (PTRACE_POKETEXT, pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
2438 | if (errno) |
2439 | return errno; | |
2440 | } | |
2441 | ||
2442 | return 0; | |
2443 | } | |
2f2893d9 | 2444 | |
24a09b5f DJ |
2445 | static int linux_supports_tracefork_flag; |
2446 | ||
51c2684e | 2447 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 2448 | |
51c2684e DJ |
2449 | static int |
2450 | linux_tracefork_grandchild (void *arg) | |
2451 | { | |
2452 | _exit (0); | |
2453 | } | |
2454 | ||
7407e2de AS |
2455 | #define STACK_SIZE 4096 |
2456 | ||
51c2684e DJ |
2457 | static int |
2458 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
2459 | { |
2460 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
2461 | kill (getpid (), SIGSTOP); | |
7407e2de AS |
2462 | #ifdef __ia64__ |
2463 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
2464 | CLONE_VM | SIGCHLD, NULL); | |
2465 | #else | |
2466 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
2467 | CLONE_VM | SIGCHLD, NULL); | |
2468 | #endif | |
24a09b5f DJ |
2469 | _exit (0); |
2470 | } | |
2471 | ||
bd99dc85 PA |
2472 | /* Wrapper function for waitpid which handles EINTR, and emulates |
2473 | __WALL for systems where that is not available. */ | |
24a09b5f DJ |
2474 | |
2475 | static int | |
2476 | my_waitpid (int pid, int *status, int flags) | |
2477 | { | |
bd99dc85 PA |
2478 | int ret, out_errno; |
2479 | ||
2480 | if (debug_threads) | |
2481 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
2482 | ||
2483 | if (flags & __WALL) | |
24a09b5f | 2484 | { |
bd99dc85 PA |
2485 | sigset_t block_mask, org_mask, wake_mask; |
2486 | int wnohang; | |
2487 | ||
2488 | wnohang = (flags & WNOHANG) != 0; | |
2489 | flags &= ~(__WALL | __WCLONE); | |
2490 | flags |= WNOHANG; | |
2491 | ||
2492 | /* Block all signals while here. This avoids knowing about | |
2493 | LinuxThread's signals. */ | |
2494 | sigfillset (&block_mask); | |
2495 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
2496 | ||
2497 | /* ... except during the sigsuspend below. */ | |
2498 | sigemptyset (&wake_mask); | |
2499 | ||
2500 | while (1) | |
2501 | { | |
2502 | /* Since all signals are blocked, there's no need to check | |
2503 | for EINTR here. */ | |
2504 | ret = waitpid (pid, status, flags); | |
2505 | out_errno = errno; | |
2506 | ||
2507 | if (ret == -1 && out_errno != ECHILD) | |
2508 | break; | |
2509 | else if (ret > 0) | |
2510 | break; | |
2511 | ||
2512 | if (flags & __WCLONE) | |
2513 | { | |
2514 | /* We've tried both flavors now. If WNOHANG is set, | |
2515 | there's nothing else to do, just bail out. */ | |
2516 | if (wnohang) | |
2517 | break; | |
2518 | ||
2519 | if (debug_threads) | |
2520 | fprintf (stderr, "blocking\n"); | |
2521 | ||
2522 | /* Block waiting for signals. */ | |
2523 | sigsuspend (&wake_mask); | |
2524 | } | |
2525 | ||
2526 | flags ^= __WCLONE; | |
2527 | } | |
2528 | ||
2529 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
24a09b5f | 2530 | } |
bd99dc85 PA |
2531 | else |
2532 | { | |
2533 | do | |
2534 | ret = waitpid (pid, status, flags); | |
2535 | while (ret == -1 && errno == EINTR); | |
2536 | out_errno = errno; | |
2537 | } | |
2538 | ||
2539 | if (debug_threads) | |
2540 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
2541 | pid, flags, status ? *status : -1, ret); | |
24a09b5f | 2542 | |
bd99dc85 | 2543 | errno = out_errno; |
24a09b5f DJ |
2544 | return ret; |
2545 | } | |
2546 | ||
2547 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make | |
2548 | sure that we can enable the option, and that it had the desired | |
2549 | effect. */ | |
2550 | ||
2551 | static void | |
2552 | linux_test_for_tracefork (void) | |
2553 | { | |
2554 | int child_pid, ret, status; | |
2555 | long second_pid; | |
bca929d3 | 2556 | char *stack = xmalloc (STACK_SIZE * 4); |
24a09b5f DJ |
2557 | |
2558 | linux_supports_tracefork_flag = 0; | |
2559 | ||
51c2684e | 2560 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
2561 | #ifdef __ia64__ |
2562 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
2563 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2564 | #else | |
2565 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, | |
2566 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2567 | #endif | |
24a09b5f | 2568 | if (child_pid == -1) |
51c2684e | 2569 | perror_with_name ("clone"); |
24a09b5f DJ |
2570 | |
2571 | ret = my_waitpid (child_pid, &status, 0); | |
2572 | if (ret == -1) | |
2573 | perror_with_name ("waitpid"); | |
2574 | else if (ret != child_pid) | |
2575 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
2576 | if (! WIFSTOPPED (status)) | |
2577 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
2578 | ||
2579 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); | |
2580 | if (ret != 0) | |
2581 | { | |
2582 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2583 | if (ret != 0) | |
2584 | { | |
2585 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2586 | return; | |
2587 | } | |
2588 | ||
2589 | ret = my_waitpid (child_pid, &status, 0); | |
2590 | if (ret != child_pid) | |
2591 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
2592 | else if (!WIFSIGNALED (status)) | |
2593 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
2594 | "killed child", status); | |
2595 | ||
2596 | return; | |
2597 | } | |
2598 | ||
2599 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
2600 | if (ret != 0) | |
2601 | warning ("linux_test_for_tracefork: failed to resume child"); | |
2602 | ||
2603 | ret = my_waitpid (child_pid, &status, 0); | |
2604 | ||
2605 | if (ret == child_pid && WIFSTOPPED (status) | |
2606 | && status >> 16 == PTRACE_EVENT_FORK) | |
2607 | { | |
2608 | second_pid = 0; | |
2609 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
2610 | if (ret == 0 && second_pid != 0) | |
2611 | { | |
2612 | int second_status; | |
2613 | ||
2614 | linux_supports_tracefork_flag = 1; | |
2615 | my_waitpid (second_pid, &second_status, 0); | |
2616 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
2617 | if (ret != 0) | |
2618 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
2619 | my_waitpid (second_pid, &status, 0); | |
2620 | } | |
2621 | } | |
2622 | else | |
2623 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
2624 | "(%d, status 0x%x)", ret, status); | |
2625 | ||
2626 | do | |
2627 | { | |
2628 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2629 | if (ret != 0) | |
2630 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2631 | my_waitpid (child_pid, &status, 0); | |
2632 | } | |
2633 | while (WIFSTOPPED (status)); | |
51c2684e DJ |
2634 | |
2635 | free (stack); | |
24a09b5f DJ |
2636 | } |
2637 | ||
2638 | ||
2f2893d9 DJ |
2639 | static void |
2640 | linux_look_up_symbols (void) | |
2641 | { | |
0d62e5e8 | 2642 | #ifdef USE_THREAD_DB |
95954743 PA |
2643 | struct process_info *proc = current_process (); |
2644 | ||
2645 | if (proc->private->thread_db_active) | |
0d62e5e8 DJ |
2646 | return; |
2647 | ||
95954743 PA |
2648 | proc->private->thread_db_active |
2649 | = thread_db_init (!linux_supports_tracefork_flag); | |
0d62e5e8 DJ |
2650 | #endif |
2651 | } | |
2652 | ||
e5379b03 | 2653 | static void |
ef57601b | 2654 | linux_request_interrupt (void) |
e5379b03 | 2655 | { |
a1928bad | 2656 | extern unsigned long signal_pid; |
e5379b03 | 2657 | |
95954743 PA |
2658 | if (!ptid_equal (cont_thread, null_ptid) |
2659 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 2660 | { |
54a0b537 | 2661 | struct lwp_info *lwp; |
bd99dc85 | 2662 | int lwpid; |
e5379b03 | 2663 | |
54a0b537 | 2664 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
2665 | lwpid = lwpid_of (lwp); |
2666 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
2667 | } |
2668 | else | |
ef57601b | 2669 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
2670 | } |
2671 | ||
aa691b87 RM |
2672 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
2673 | to debugger memory starting at MYADDR. */ | |
2674 | ||
2675 | static int | |
f450004a | 2676 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
2677 | { |
2678 | char filename[PATH_MAX]; | |
2679 | int fd, n; | |
95954743 | 2680 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 2681 | |
95954743 | 2682 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
2683 | |
2684 | fd = open (filename, O_RDONLY); | |
2685 | if (fd < 0) | |
2686 | return -1; | |
2687 | ||
2688 | if (offset != (CORE_ADDR) 0 | |
2689 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
2690 | n = -1; | |
2691 | else | |
2692 | n = read (fd, myaddr, len); | |
2693 | ||
2694 | close (fd); | |
2695 | ||
2696 | return n; | |
2697 | } | |
2698 | ||
d993e290 PA |
2699 | /* These breakpoint and watchpoint related wrapper functions simply |
2700 | pass on the function call if the target has registered a | |
2701 | corresponding function. */ | |
e013ee27 OF |
2702 | |
2703 | static int | |
d993e290 | 2704 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2705 | { |
d993e290 PA |
2706 | if (the_low_target.insert_point != NULL) |
2707 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
2708 | else |
2709 | /* Unsupported (see target.h). */ | |
2710 | return 1; | |
2711 | } | |
2712 | ||
2713 | static int | |
d993e290 | 2714 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2715 | { |
d993e290 PA |
2716 | if (the_low_target.remove_point != NULL) |
2717 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
2718 | else |
2719 | /* Unsupported (see target.h). */ | |
2720 | return 1; | |
2721 | } | |
2722 | ||
2723 | static int | |
2724 | linux_stopped_by_watchpoint (void) | |
2725 | { | |
2726 | if (the_low_target.stopped_by_watchpoint != NULL) | |
2727 | return the_low_target.stopped_by_watchpoint (); | |
2728 | else | |
2729 | return 0; | |
2730 | } | |
2731 | ||
2732 | static CORE_ADDR | |
2733 | linux_stopped_data_address (void) | |
2734 | { | |
2735 | if (the_low_target.stopped_data_address != NULL) | |
2736 | return the_low_target.stopped_data_address (); | |
2737 | else | |
2738 | return 0; | |
2739 | } | |
2740 | ||
42c81e2a | 2741 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
2742 | #if defined(__mcoldfire__) |
2743 | /* These should really be defined in the kernel's ptrace.h header. */ | |
2744 | #define PT_TEXT_ADDR 49*4 | |
2745 | #define PT_DATA_ADDR 50*4 | |
2746 | #define PT_TEXT_END_ADDR 51*4 | |
2747 | #endif | |
2748 | ||
2749 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
2750 | to tell gdb about. */ | |
2751 | ||
2752 | static int | |
2753 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
2754 | { | |
2755 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
2756 | unsigned long text, text_end, data; | |
bd99dc85 | 2757 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
2758 | |
2759 | errno = 0; | |
2760 | ||
2761 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
2762 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
2763 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
2764 | ||
2765 | if (errno == 0) | |
2766 | { | |
2767 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
2768 | used by gdb) are relative to the beginning of the program, |
2769 | with the data segment immediately following the text segment. | |
2770 | However, the actual runtime layout in memory may put the data | |
2771 | somewhere else, so when we send gdb a data base-address, we | |
2772 | use the real data base address and subtract the compile-time | |
2773 | data base-address from it (which is just the length of the | |
2774 | text segment). BSS immediately follows data in both | |
2775 | cases. */ | |
52fb6437 NS |
2776 | *text_p = text; |
2777 | *data_p = data - (text_end - text); | |
1b3f6016 | 2778 | |
52fb6437 NS |
2779 | return 1; |
2780 | } | |
2781 | #endif | |
2782 | return 0; | |
2783 | } | |
2784 | #endif | |
2785 | ||
07e059b5 VP |
2786 | static int |
2787 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
2788 | unsigned char *readbuf, unsigned const char *writebuf, |
2789 | CORE_ADDR offset, int len) | |
07e059b5 VP |
2790 | { |
2791 | /* We make the process list snapshot when the object starts to be | |
2792 | read. */ | |
2793 | static const char *buf; | |
2794 | static long len_avail = -1; | |
2795 | static struct buffer buffer; | |
2796 | ||
2797 | DIR *dirp; | |
2798 | ||
2799 | if (strcmp (annex, "processes") != 0) | |
2800 | return 0; | |
2801 | ||
2802 | if (!readbuf || writebuf) | |
2803 | return 0; | |
2804 | ||
2805 | if (offset == 0) | |
2806 | { | |
2807 | if (len_avail != -1 && len_avail != 0) | |
2808 | buffer_free (&buffer); | |
2809 | len_avail = 0; | |
2810 | buf = NULL; | |
2811 | buffer_init (&buffer); | |
2812 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
2813 | ||
2814 | dirp = opendir ("/proc"); | |
2815 | if (dirp) | |
2816 | { | |
1b3f6016 PA |
2817 | struct dirent *dp; |
2818 | while ((dp = readdir (dirp)) != NULL) | |
2819 | { | |
2820 | struct stat statbuf; | |
2821 | char procentry[sizeof ("/proc/4294967295")]; | |
2822 | ||
2823 | if (!isdigit (dp->d_name[0]) | |
2824 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
2825 | continue; | |
2826 | ||
2827 | sprintf (procentry, "/proc/%s", dp->d_name); | |
2828 | if (stat (procentry, &statbuf) == 0 | |
2829 | && S_ISDIR (statbuf.st_mode)) | |
2830 | { | |
2831 | char pathname[128]; | |
2832 | FILE *f; | |
2833 | char cmd[MAXPATHLEN + 1]; | |
2834 | struct passwd *entry; | |
2835 | ||
2836 | sprintf (pathname, "/proc/%s/cmdline", dp->d_name); | |
2837 | entry = getpwuid (statbuf.st_uid); | |
2838 | ||
2839 | if ((f = fopen (pathname, "r")) != NULL) | |
2840 | { | |
2841 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
2842 | if (len > 0) | |
2843 | { | |
2844 | int i; | |
2845 | for (i = 0; i < len; i++) | |
2846 | if (cmd[i] == '\0') | |
2847 | cmd[i] = ' '; | |
2848 | cmd[len] = '\0'; | |
2849 | ||
2850 | buffer_xml_printf ( | |
07e059b5 VP |
2851 | &buffer, |
2852 | "<item>" | |
2853 | "<column name=\"pid\">%s</column>" | |
2854 | "<column name=\"user\">%s</column>" | |
2855 | "<column name=\"command\">%s</column>" | |
2856 | "</item>", | |
2857 | dp->d_name, | |
2858 | entry ? entry->pw_name : "?", | |
2859 | cmd); | |
1b3f6016 PA |
2860 | } |
2861 | fclose (f); | |
2862 | } | |
2863 | } | |
2864 | } | |
07e059b5 | 2865 | |
1b3f6016 | 2866 | closedir (dirp); |
07e059b5 VP |
2867 | } |
2868 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
2869 | buf = buffer_finish (&buffer); | |
2870 | len_avail = strlen (buf); | |
2871 | } | |
2872 | ||
2873 | if (offset >= len_avail) | |
2874 | { | |
2875 | /* Done. Get rid of the data. */ | |
2876 | buffer_free (&buffer); | |
2877 | buf = NULL; | |
2878 | len_avail = 0; | |
2879 | return 0; | |
2880 | } | |
2881 | ||
2882 | if (len > len_avail - offset) | |
2883 | len = len_avail - offset; | |
2884 | memcpy (readbuf, buf + offset, len); | |
2885 | ||
2886 | return len; | |
2887 | } | |
2888 | ||
d0722149 DE |
2889 | /* Convert a native/host siginfo object, into/from the siginfo in the |
2890 | layout of the inferiors' architecture. */ | |
2891 | ||
2892 | static void | |
2893 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
2894 | { | |
2895 | int done = 0; | |
2896 | ||
2897 | if (the_low_target.siginfo_fixup != NULL) | |
2898 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
2899 | ||
2900 | /* If there was no callback, or the callback didn't do anything, | |
2901 | then just do a straight memcpy. */ | |
2902 | if (!done) | |
2903 | { | |
2904 | if (direction == 1) | |
2905 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
2906 | else | |
2907 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
2908 | } | |
2909 | } | |
2910 | ||
4aa995e1 PA |
2911 | static int |
2912 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
2913 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
2914 | { | |
d0722149 | 2915 | int pid; |
4aa995e1 | 2916 | struct siginfo siginfo; |
d0722149 | 2917 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
2918 | |
2919 | if (current_inferior == NULL) | |
2920 | return -1; | |
2921 | ||
bd99dc85 | 2922 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
2923 | |
2924 | if (debug_threads) | |
d0722149 | 2925 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
2926 | readbuf != NULL ? "Reading" : "Writing", |
2927 | pid); | |
2928 | ||
2929 | if (offset > sizeof (siginfo)) | |
2930 | return -1; | |
2931 | ||
2932 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
2933 | return -1; | |
2934 | ||
d0722149 DE |
2935 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
2936 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
2937 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
2938 | with a 32-bit GDBSERVER, we need to convert it. */ | |
2939 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
2940 | ||
4aa995e1 PA |
2941 | if (offset + len > sizeof (siginfo)) |
2942 | len = sizeof (siginfo) - offset; | |
2943 | ||
2944 | if (readbuf != NULL) | |
d0722149 | 2945 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
2946 | else |
2947 | { | |
d0722149 DE |
2948 | memcpy (inf_siginfo + offset, writebuf, len); |
2949 | ||
2950 | /* Convert back to ptrace layout before flushing it out. */ | |
2951 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
2952 | ||
4aa995e1 PA |
2953 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
2954 | return -1; | |
2955 | } | |
2956 | ||
2957 | return len; | |
2958 | } | |
2959 | ||
bd99dc85 PA |
2960 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
2961 | so we notice when children change state; as the handler for the | |
2962 | sigsuspend in my_waitpid. */ | |
2963 | ||
2964 | static void | |
2965 | sigchld_handler (int signo) | |
2966 | { | |
2967 | int old_errno = errno; | |
2968 | ||
2969 | if (debug_threads) | |
2970 | /* fprintf is not async-signal-safe, so call write directly. */ | |
2971 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
2972 | ||
2973 | if (target_is_async_p ()) | |
2974 | async_file_mark (); /* trigger a linux_wait */ | |
2975 | ||
2976 | errno = old_errno; | |
2977 | } | |
2978 | ||
2979 | static int | |
2980 | linux_supports_non_stop (void) | |
2981 | { | |
2982 | return 1; | |
2983 | } | |
2984 | ||
2985 | static int | |
2986 | linux_async (int enable) | |
2987 | { | |
2988 | int previous = (linux_event_pipe[0] != -1); | |
2989 | ||
2990 | if (previous != enable) | |
2991 | { | |
2992 | sigset_t mask; | |
2993 | sigemptyset (&mask); | |
2994 | sigaddset (&mask, SIGCHLD); | |
2995 | ||
2996 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
2997 | ||
2998 | if (enable) | |
2999 | { | |
3000 | if (pipe (linux_event_pipe) == -1) | |
3001 | fatal ("creating event pipe failed."); | |
3002 | ||
3003 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
3004 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
3005 | ||
3006 | /* Register the event loop handler. */ | |
3007 | add_file_handler (linux_event_pipe[0], | |
3008 | handle_target_event, NULL); | |
3009 | ||
3010 | /* Always trigger a linux_wait. */ | |
3011 | async_file_mark (); | |
3012 | } | |
3013 | else | |
3014 | { | |
3015 | delete_file_handler (linux_event_pipe[0]); | |
3016 | ||
3017 | close (linux_event_pipe[0]); | |
3018 | close (linux_event_pipe[1]); | |
3019 | linux_event_pipe[0] = -1; | |
3020 | linux_event_pipe[1] = -1; | |
3021 | } | |
3022 | ||
3023 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
3024 | } | |
3025 | ||
3026 | return previous; | |
3027 | } | |
3028 | ||
3029 | static int | |
3030 | linux_start_non_stop (int nonstop) | |
3031 | { | |
3032 | /* Register or unregister from event-loop accordingly. */ | |
3033 | linux_async (nonstop); | |
3034 | return 0; | |
3035 | } | |
3036 | ||
cf8fd78b PA |
3037 | static int |
3038 | linux_supports_multi_process (void) | |
3039 | { | |
3040 | return 1; | |
3041 | } | |
3042 | ||
efcbbd14 UW |
3043 | |
3044 | /* Enumerate spufs IDs for process PID. */ | |
3045 | static int | |
3046 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
3047 | { | |
3048 | int pos = 0; | |
3049 | int written = 0; | |
3050 | char path[128]; | |
3051 | DIR *dir; | |
3052 | struct dirent *entry; | |
3053 | ||
3054 | sprintf (path, "/proc/%ld/fd", pid); | |
3055 | dir = opendir (path); | |
3056 | if (!dir) | |
3057 | return -1; | |
3058 | ||
3059 | rewinddir (dir); | |
3060 | while ((entry = readdir (dir)) != NULL) | |
3061 | { | |
3062 | struct stat st; | |
3063 | struct statfs stfs; | |
3064 | int fd; | |
3065 | ||
3066 | fd = atoi (entry->d_name); | |
3067 | if (!fd) | |
3068 | continue; | |
3069 | ||
3070 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
3071 | if (stat (path, &st) != 0) | |
3072 | continue; | |
3073 | if (!S_ISDIR (st.st_mode)) | |
3074 | continue; | |
3075 | ||
3076 | if (statfs (path, &stfs) != 0) | |
3077 | continue; | |
3078 | if (stfs.f_type != SPUFS_MAGIC) | |
3079 | continue; | |
3080 | ||
3081 | if (pos >= offset && pos + 4 <= offset + len) | |
3082 | { | |
3083 | *(unsigned int *)(buf + pos - offset) = fd; | |
3084 | written += 4; | |
3085 | } | |
3086 | pos += 4; | |
3087 | } | |
3088 | ||
3089 | closedir (dir); | |
3090 | return written; | |
3091 | } | |
3092 | ||
3093 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
3094 | object type, using the /proc file system. */ | |
3095 | static int | |
3096 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
3097 | unsigned const char *writebuf, | |
3098 | CORE_ADDR offset, int len) | |
3099 | { | |
3100 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
3101 | char buf[128]; | |
3102 | int fd = 0; | |
3103 | int ret = 0; | |
3104 | ||
3105 | if (!writebuf && !readbuf) | |
3106 | return -1; | |
3107 | ||
3108 | if (!*annex) | |
3109 | { | |
3110 | if (!readbuf) | |
3111 | return -1; | |
3112 | else | |
3113 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
3114 | } | |
3115 | ||
3116 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
3117 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
3118 | if (fd <= 0) | |
3119 | return -1; | |
3120 | ||
3121 | if (offset != 0 | |
3122 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
3123 | { | |
3124 | close (fd); | |
3125 | return 0; | |
3126 | } | |
3127 | ||
3128 | if (writebuf) | |
3129 | ret = write (fd, writebuf, (size_t) len); | |
3130 | else | |
3131 | ret = read (fd, readbuf, (size_t) len); | |
3132 | ||
3133 | close (fd); | |
3134 | return ret; | |
3135 | } | |
3136 | ||
ce3a066d DJ |
3137 | static struct target_ops linux_target_ops = { |
3138 | linux_create_inferior, | |
3139 | linux_attach, | |
3140 | linux_kill, | |
6ad8ae5c | 3141 | linux_detach, |
444d6139 | 3142 | linux_join, |
ce3a066d DJ |
3143 | linux_thread_alive, |
3144 | linux_resume, | |
3145 | linux_wait, | |
3146 | linux_fetch_registers, | |
3147 | linux_store_registers, | |
3148 | linux_read_memory, | |
3149 | linux_write_memory, | |
2f2893d9 | 3150 | linux_look_up_symbols, |
ef57601b | 3151 | linux_request_interrupt, |
aa691b87 | 3152 | linux_read_auxv, |
d993e290 PA |
3153 | linux_insert_point, |
3154 | linux_remove_point, | |
e013ee27 OF |
3155 | linux_stopped_by_watchpoint, |
3156 | linux_stopped_data_address, | |
42c81e2a | 3157 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 3158 | linux_read_offsets, |
dae5f5cf DJ |
3159 | #else |
3160 | NULL, | |
3161 | #endif | |
3162 | #ifdef USE_THREAD_DB | |
3163 | thread_db_get_tls_address, | |
3164 | #else | |
3165 | NULL, | |
52fb6437 | 3166 | #endif |
efcbbd14 | 3167 | linux_qxfer_spu, |
59a016f0 | 3168 | hostio_last_error_from_errno, |
07e059b5 | 3169 | linux_qxfer_osdata, |
4aa995e1 | 3170 | linux_xfer_siginfo, |
bd99dc85 PA |
3171 | linux_supports_non_stop, |
3172 | linux_async, | |
3173 | linux_start_non_stop, | |
cf8fd78b | 3174 | linux_supports_multi_process |
ce3a066d DJ |
3175 | }; |
3176 | ||
0d62e5e8 DJ |
3177 | static void |
3178 | linux_init_signals () | |
3179 | { | |
3180 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
3181 | to find what the cancel signal actually is. */ | |
254787d4 | 3182 | signal (__SIGRTMIN+1, SIG_IGN); |
0d62e5e8 DJ |
3183 | } |
3184 | ||
da6d8c04 DJ |
3185 | void |
3186 | initialize_low (void) | |
3187 | { | |
bd99dc85 PA |
3188 | struct sigaction sigchld_action; |
3189 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 3190 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
3191 | set_breakpoint_data (the_low_target.breakpoint, |
3192 | the_low_target.breakpoint_len); | |
0d62e5e8 | 3193 | linux_init_signals (); |
24a09b5f | 3194 | linux_test_for_tracefork (); |
52fa2412 UW |
3195 | #ifdef HAVE_LINUX_REGSETS |
3196 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
3197 | ; | |
bca929d3 | 3198 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 3199 | #endif |
bd99dc85 PA |
3200 | |
3201 | sigchld_action.sa_handler = sigchld_handler; | |
3202 | sigemptyset (&sigchld_action.sa_mask); | |
3203 | sigchld_action.sa_flags = SA_RESTART; | |
3204 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 3205 | } |