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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> | |
da6d8c04 | 43 | |
32ca6d61 DJ |
44 | #ifndef PTRACE_GETSIGINFO |
45 | # define PTRACE_GETSIGINFO 0x4202 | |
46 | # define PTRACE_SETSIGINFO 0x4203 | |
47 | #endif | |
48 | ||
fd462a61 DJ |
49 | #ifndef O_LARGEFILE |
50 | #define O_LARGEFILE 0 | |
51 | #endif | |
52 | ||
24a09b5f DJ |
53 | /* If the system headers did not provide the constants, hard-code the normal |
54 | values. */ | |
55 | #ifndef PTRACE_EVENT_FORK | |
56 | ||
57 | #define PTRACE_SETOPTIONS 0x4200 | |
58 | #define PTRACE_GETEVENTMSG 0x4201 | |
59 | ||
60 | /* options set using PTRACE_SETOPTIONS */ | |
61 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
62 | #define PTRACE_O_TRACEFORK 0x00000002 | |
63 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
64 | #define PTRACE_O_TRACECLONE 0x00000008 | |
65 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
66 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 | |
67 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
68 | ||
69 | /* Wait extended result codes for the above trace options. */ | |
70 | #define PTRACE_EVENT_FORK 1 | |
71 | #define PTRACE_EVENT_VFORK 2 | |
72 | #define PTRACE_EVENT_CLONE 3 | |
73 | #define PTRACE_EVENT_EXEC 4 | |
74 | #define PTRACE_EVENT_VFORK_DONE 5 | |
75 | #define PTRACE_EVENT_EXIT 6 | |
76 | ||
77 | #endif /* PTRACE_EVENT_FORK */ | |
78 | ||
79 | /* We can't always assume that this flag is available, but all systems | |
80 | with the ptrace event handlers also have __WALL, so it's safe to use | |
81 | in some contexts. */ | |
82 | #ifndef __WALL | |
83 | #define __WALL 0x40000000 /* Wait for any child. */ | |
84 | #endif | |
85 | ||
42c81e2a DJ |
86 | #ifdef __UCLIBC__ |
87 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
88 | #define HAS_NOMMU | |
89 | #endif | |
90 | #endif | |
91 | ||
24a09b5f DJ |
92 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
93 | representation of the thread ID. | |
611cb4a5 | 94 | |
54a0b537 | 95 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
96 | the same as the LWP ID. |
97 | ||
98 | ``all_processes'' is keyed by the "overall process ID", which | |
99 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 100 | |
54a0b537 | 101 | struct inferior_list all_lwps; |
0d62e5e8 | 102 | |
24a09b5f DJ |
103 | /* A list of all unknown processes which receive stop signals. Some other |
104 | process will presumably claim each of these as forked children | |
105 | momentarily. */ | |
106 | ||
107 | struct inferior_list stopped_pids; | |
108 | ||
0d62e5e8 DJ |
109 | /* FIXME this is a bit of a hack, and could be removed. */ |
110 | int stopping_threads; | |
111 | ||
112 | /* FIXME make into a target method? */ | |
24a09b5f | 113 | int using_threads = 1; |
24a09b5f | 114 | |
95954743 PA |
115 | /* This flag is true iff we've just created or attached to our first |
116 | inferior but it has not stopped yet. As soon as it does, we need | |
117 | to call the low target's arch_setup callback. Doing this only on | |
118 | the first inferior avoids reinializing the architecture on every | |
119 | inferior, and avoids messing with the register caches of the | |
120 | already running inferiors. NOTE: this assumes all inferiors under | |
121 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
122 | static int new_inferior; |
123 | ||
2acc282a | 124 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 125 | int step, int signal, siginfo_t *info); |
2bd7c093 | 126 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
54a0b537 | 127 | static void stop_all_lwps (void); |
95954743 | 128 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
54a0b537 | 129 | static int check_removed_breakpoint (struct lwp_info *event_child); |
95954743 | 130 | static void *add_lwp (ptid_t ptid); |
97438e3f | 131 | static int my_waitpid (int pid, int *status, int flags); |
c35fafde | 132 | static int linux_stopped_by_watchpoint (void); |
95954743 | 133 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
0d62e5e8 DJ |
134 | |
135 | struct pending_signals | |
136 | { | |
137 | int signal; | |
32ca6d61 | 138 | siginfo_t info; |
0d62e5e8 DJ |
139 | struct pending_signals *prev; |
140 | }; | |
611cb4a5 | 141 | |
d844cde6 | 142 | #define PTRACE_ARG3_TYPE long |
c6ecbae5 | 143 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 144 | |
58caa3dc | 145 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
146 | static char *disabled_regsets; |
147 | static int num_regsets; | |
58caa3dc DJ |
148 | #endif |
149 | ||
bd99dc85 PA |
150 | /* The read/write ends of the pipe registered as waitable file in the |
151 | event loop. */ | |
152 | static int linux_event_pipe[2] = { -1, -1 }; | |
153 | ||
154 | /* True if we're currently in async mode. */ | |
155 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
156 | ||
157 | static void send_sigstop (struct inferior_list_entry *entry); | |
158 | static void wait_for_sigstop (struct inferior_list_entry *entry); | |
159 | ||
d0722149 DE |
160 | /* Accepts an integer PID; Returns a string representing a file that |
161 | can be opened to get info for the child process. | |
162 | Space for the result is malloc'd, caller must free. */ | |
163 | ||
164 | char * | |
165 | linux_child_pid_to_exec_file (int pid) | |
166 | { | |
167 | char *name1, *name2; | |
168 | ||
169 | name1 = xmalloc (MAXPATHLEN); | |
170 | name2 = xmalloc (MAXPATHLEN); | |
171 | memset (name2, 0, MAXPATHLEN); | |
172 | ||
173 | sprintf (name1, "/proc/%d/exe", pid); | |
174 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
175 | { | |
176 | free (name1); | |
177 | return name2; | |
178 | } | |
179 | else | |
180 | { | |
181 | free (name2); | |
182 | return name1; | |
183 | } | |
184 | } | |
185 | ||
186 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
187 | ||
188 | static int | |
189 | elf_64_header_p (const Elf64_External_Ehdr *header) | |
190 | { | |
191 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
192 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
193 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
194 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
195 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
196 | } | |
197 | ||
198 | /* Return non-zero if FILE is a 64-bit ELF file, | |
199 | zero if the file is not a 64-bit ELF file, | |
200 | and -1 if the file is not accessible or doesn't exist. */ | |
201 | ||
202 | int | |
203 | elf_64_file_p (const char *file) | |
204 | { | |
205 | Elf64_External_Ehdr header; | |
206 | int fd; | |
207 | ||
208 | fd = open (file, O_RDONLY); | |
209 | if (fd < 0) | |
210 | return -1; | |
211 | ||
212 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
213 | { | |
214 | close (fd); | |
215 | return 0; | |
216 | } | |
217 | close (fd); | |
218 | ||
219 | return elf_64_header_p (&header); | |
220 | } | |
221 | ||
bd99dc85 PA |
222 | static void |
223 | delete_lwp (struct lwp_info *lwp) | |
224 | { | |
225 | remove_thread (get_lwp_thread (lwp)); | |
226 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 227 | free (lwp->arch_private); |
bd99dc85 PA |
228 | free (lwp); |
229 | } | |
230 | ||
95954743 PA |
231 | /* Add a process to the common process list, and set its private |
232 | data. */ | |
233 | ||
234 | static struct process_info * | |
235 | linux_add_process (int pid, int attached) | |
236 | { | |
237 | struct process_info *proc; | |
238 | ||
239 | /* Is this the first process? If so, then set the arch. */ | |
240 | if (all_processes.head == NULL) | |
241 | new_inferior = 1; | |
242 | ||
243 | proc = add_process (pid, attached); | |
244 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
245 | ||
aa5ca48f DE |
246 | if (the_low_target.new_process != NULL) |
247 | proc->private->arch_private = the_low_target.new_process (); | |
248 | ||
95954743 PA |
249 | return proc; |
250 | } | |
251 | ||
5091eb23 DE |
252 | /* Remove a process from the common process list, |
253 | also freeing all private data. */ | |
254 | ||
255 | static void | |
256 | linux_remove_process (struct process_info *process) | |
257 | { | |
aa5ca48f | 258 | free (process->private->arch_private); |
5091eb23 DE |
259 | free (process->private); |
260 | remove_process (process); | |
261 | } | |
262 | ||
bd99dc85 PA |
263 | /* Handle a GNU/Linux extended wait response. If we see a clone |
264 | event, we need to add the new LWP to our list (and not report the | |
265 | trap to higher layers). */ | |
0d62e5e8 | 266 | |
24a09b5f | 267 | static void |
54a0b537 | 268 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
269 | { |
270 | int event = wstat >> 16; | |
54a0b537 | 271 | struct lwp_info *new_lwp; |
24a09b5f DJ |
272 | |
273 | if (event == PTRACE_EVENT_CLONE) | |
274 | { | |
95954743 | 275 | ptid_t ptid; |
24a09b5f | 276 | unsigned long new_pid; |
836acd6d | 277 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 278 | |
bd99dc85 | 279 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
280 | |
281 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
282 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
283 | { | |
284 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
285 | hits the SIGSTOP, but we're already attached. */ | |
286 | ||
97438e3f | 287 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
288 | |
289 | if (ret == -1) | |
290 | perror_with_name ("waiting for new child"); | |
291 | else if (ret != new_pid) | |
292 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 293 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
294 | warning ("wait returned unexpected status 0x%x", status); |
295 | } | |
296 | ||
297 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE); | |
298 | ||
95954743 PA |
299 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
300 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
301 | add_thread (ptid, new_lwp); | |
24a09b5f | 302 | |
e27d73f6 DE |
303 | /* Either we're going to immediately resume the new thread |
304 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
305 | thinks the thread is currently running, so set this first | |
306 | before calling linux_resume_one_lwp. */ | |
307 | new_lwp->stopped = 1; | |
308 | ||
da5898ce DJ |
309 | /* Normally we will get the pending SIGSTOP. But in some cases |
310 | we might get another signal delivered to the group first. | |
f21cc1a2 | 311 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
312 | if (WSTOPSIG (status) == SIGSTOP) |
313 | { | |
e27d73f6 DE |
314 | if (! stopping_threads) |
315 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); | |
da5898ce | 316 | } |
24a09b5f | 317 | else |
da5898ce | 318 | { |
54a0b537 | 319 | new_lwp->stop_expected = 1; |
da5898ce DJ |
320 | if (stopping_threads) |
321 | { | |
54a0b537 PA |
322 | new_lwp->status_pending_p = 1; |
323 | new_lwp->status_pending = status; | |
da5898ce DJ |
324 | } |
325 | else | |
326 | /* Pass the signal on. This is what GDB does - except | |
327 | shouldn't we really report it instead? */ | |
e27d73f6 | 328 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 329 | } |
24a09b5f DJ |
330 | |
331 | /* Always resume the current thread. If we are stopping | |
332 | threads, it will have a pending SIGSTOP; we may as well | |
333 | collect it now. */ | |
2acc282a | 334 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
335 | } |
336 | } | |
337 | ||
0d62e5e8 DJ |
338 | /* This function should only be called if the process got a SIGTRAP. |
339 | The SIGTRAP could mean several things. | |
340 | ||
341 | On i386, where decr_pc_after_break is non-zero: | |
342 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
343 | we will get only the one SIGTRAP (even if the instruction we | |
344 | stepped over was a breakpoint). The value of $eip will be the | |
345 | next instruction. | |
346 | If we continue the process using PTRACE_CONT, we will get a | |
347 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
348 | the instruction after the breakpoint (i.e. needs to be | |
349 | decremented). If we report the SIGTRAP to GDB, we must also | |
350 | report the undecremented PC. If we cancel the SIGTRAP, we | |
351 | must resume at the decremented PC. | |
352 | ||
353 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
354 | with hardware or kernel single-step: | |
355 | If we single-step over a breakpoint instruction, our PC will | |
356 | point at the following instruction. If we continue and hit a | |
357 | breakpoint instruction, our PC will point at the breakpoint | |
358 | instruction. */ | |
359 | ||
360 | static CORE_ADDR | |
361 | get_stop_pc (void) | |
362 | { | |
363 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
364 | ||
47c0c975 DE |
365 | if (! get_thread_lwp (current_inferior)->stepping) |
366 | stop_pc -= the_low_target.decr_pc_after_break; | |
367 | ||
368 | if (debug_threads) | |
369 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
370 | ||
371 | return stop_pc; | |
0d62e5e8 | 372 | } |
ce3a066d | 373 | |
0d62e5e8 | 374 | static void * |
95954743 | 375 | add_lwp (ptid_t ptid) |
611cb4a5 | 376 | { |
54a0b537 | 377 | struct lwp_info *lwp; |
0d62e5e8 | 378 | |
54a0b537 PA |
379 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
380 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 381 | |
95954743 | 382 | lwp->head.id = ptid; |
0d62e5e8 | 383 | |
aa5ca48f DE |
384 | if (the_low_target.new_thread != NULL) |
385 | lwp->arch_private = the_low_target.new_thread (); | |
386 | ||
54a0b537 | 387 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 388 | |
54a0b537 | 389 | return lwp; |
0d62e5e8 | 390 | } |
611cb4a5 | 391 | |
da6d8c04 DJ |
392 | /* Start an inferior process and returns its pid. |
393 | ALLARGS is a vector of program-name and args. */ | |
394 | ||
ce3a066d DJ |
395 | static int |
396 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 397 | { |
a6dbe5df | 398 | struct lwp_info *new_lwp; |
da6d8c04 | 399 | int pid; |
95954743 | 400 | ptid_t ptid; |
da6d8c04 | 401 | |
42c81e2a | 402 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
403 | pid = vfork (); |
404 | #else | |
da6d8c04 | 405 | pid = fork (); |
52fb6437 | 406 | #endif |
da6d8c04 DJ |
407 | if (pid < 0) |
408 | perror_with_name ("fork"); | |
409 | ||
410 | if (pid == 0) | |
411 | { | |
412 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
413 | ||
254787d4 | 414 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 415 | |
a9fa9f7d DJ |
416 | setpgid (0, 0); |
417 | ||
2b876972 DJ |
418 | execv (program, allargs); |
419 | if (errno == ENOENT) | |
420 | execvp (program, allargs); | |
da6d8c04 DJ |
421 | |
422 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 423 | strerror (errno)); |
da6d8c04 DJ |
424 | fflush (stderr); |
425 | _exit (0177); | |
426 | } | |
427 | ||
95954743 PA |
428 | linux_add_process (pid, 0); |
429 | ||
430 | ptid = ptid_build (pid, pid, 0); | |
431 | new_lwp = add_lwp (ptid); | |
432 | add_thread (ptid, new_lwp); | |
a6dbe5df | 433 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 434 | |
a9fa9f7d | 435 | return pid; |
da6d8c04 DJ |
436 | } |
437 | ||
438 | /* Attach to an inferior process. */ | |
439 | ||
95954743 PA |
440 | static void |
441 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 442 | { |
95954743 | 443 | ptid_t ptid; |
54a0b537 | 444 | struct lwp_info *new_lwp; |
611cb4a5 | 445 | |
95954743 | 446 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 447 | { |
95954743 | 448 | if (!initial) |
2d717e4f DJ |
449 | { |
450 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 451 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
452 | strerror (errno), errno); |
453 | fflush (stderr); | |
454 | return; | |
455 | } | |
456 | else | |
457 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 458 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 459 | strerror (errno), errno); |
da6d8c04 DJ |
460 | } |
461 | ||
95954743 PA |
462 | if (initial) |
463 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
464 | ptid = ptid_build (lwpid, lwpid, 0); | |
465 | else | |
466 | { | |
467 | /* Note that extracting the pid from the current inferior is | |
468 | safe, since we're always called in the context of the same | |
469 | process as this new thread. */ | |
470 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
471 | ptid = ptid_build (pid, lwpid, 0); | |
472 | } | |
24a09b5f | 473 | |
95954743 PA |
474 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
475 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 476 | |
a6dbe5df PA |
477 | /* We need to wait for SIGSTOP before being able to make the next |
478 | ptrace call on this LWP. */ | |
479 | new_lwp->must_set_ptrace_flags = 1; | |
480 | ||
0d62e5e8 | 481 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
482 | brings it to a halt. |
483 | ||
484 | There are several cases to consider here: | |
485 | ||
486 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 PA |
487 | of a new thread that is being created. |
488 | In this case we should ignore that SIGSTOP and resume the process. | |
489 | This is handled below by setting stop_expected = 1. | |
0e21c1ec DE |
490 | |
491 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
492 | to it via attach_inferior. |
493 | In this case we want the process thread to stop. | |
494 | This is handled by having linux_attach clear stop_expected after | |
495 | we return. | |
496 | ??? If the process already has several threads we leave the other | |
497 | threads running. | |
0e21c1ec DE |
498 | |
499 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
500 | existing threads. |
501 | In this case we want the thread to stop. | |
502 | FIXME: This case is currently not properly handled. | |
503 | We should wait for the SIGSTOP but don't. Things work apparently | |
504 | because enough time passes between when we ptrace (ATTACH) and when | |
505 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
506 | |
507 | On the other hand, if we are currently trying to stop all threads, we | |
508 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 509 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
510 | end of the list, and so the new thread has not yet reached |
511 | wait_for_sigstop (but will). */ | |
0d62e5e8 | 512 | if (! stopping_threads) |
54a0b537 | 513 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
514 | } |
515 | ||
95954743 PA |
516 | void |
517 | linux_attach_lwp (unsigned long lwpid) | |
518 | { | |
519 | linux_attach_lwp_1 (lwpid, 0); | |
520 | } | |
521 | ||
0d62e5e8 | 522 | int |
a1928bad | 523 | linux_attach (unsigned long pid) |
0d62e5e8 | 524 | { |
54a0b537 | 525 | struct lwp_info *lwp; |
0d62e5e8 | 526 | |
95954743 PA |
527 | linux_attach_lwp_1 (pid, 1); |
528 | ||
529 | linux_add_process (pid, 1); | |
0d62e5e8 | 530 | |
bd99dc85 PA |
531 | if (!non_stop) |
532 | { | |
533 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
534 | process. It will be collected by wait shortly. */ | |
95954743 PA |
535 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
536 | ptid_build (pid, pid, 0)); | |
bd99dc85 PA |
537 | lwp->stop_expected = 0; |
538 | } | |
0d62e5e8 | 539 | |
95954743 PA |
540 | return 0; |
541 | } | |
542 | ||
543 | struct counter | |
544 | { | |
545 | int pid; | |
546 | int count; | |
547 | }; | |
548 | ||
549 | static int | |
550 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
551 | { | |
552 | struct counter *counter = args; | |
553 | ||
554 | if (ptid_get_pid (entry->id) == counter->pid) | |
555 | { | |
556 | if (++counter->count > 1) | |
557 | return 1; | |
558 | } | |
d61ddec4 | 559 | |
da6d8c04 DJ |
560 | return 0; |
561 | } | |
562 | ||
95954743 PA |
563 | static int |
564 | last_thread_of_process_p (struct thread_info *thread) | |
565 | { | |
566 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
567 | int pid = ptid_get_pid (ptid); | |
568 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 569 | |
95954743 PA |
570 | return (find_inferior (&all_threads, |
571 | second_thread_of_pid_p, &counter) == NULL); | |
572 | } | |
573 | ||
574 | /* Kill the inferior lwp. */ | |
575 | ||
576 | static int | |
577 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 578 | { |
0d62e5e8 | 579 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 580 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 581 | int wstat; |
95954743 PA |
582 | int pid = * (int *) args; |
583 | ||
584 | if (ptid_get_pid (entry->id) != pid) | |
585 | return 0; | |
0d62e5e8 | 586 | |
fd500816 DJ |
587 | /* We avoid killing the first thread here, because of a Linux kernel (at |
588 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
589 | the children get a chance to be reaped, it will remain a zombie | |
590 | forever. */ | |
95954743 | 591 | |
12b42a12 | 592 | if (lwpid_of (lwp) == pid) |
95954743 PA |
593 | { |
594 | if (debug_threads) | |
595 | fprintf (stderr, "lkop: is last of process %s\n", | |
596 | target_pid_to_str (entry->id)); | |
597 | return 0; | |
598 | } | |
fd500816 | 599 | |
bd99dc85 PA |
600 | /* If we're killing a running inferior, make sure it is stopped |
601 | first, as PTRACE_KILL will not work otherwise. */ | |
602 | if (!lwp->stopped) | |
603 | send_sigstop (&lwp->head); | |
604 | ||
0d62e5e8 DJ |
605 | do |
606 | { | |
bd99dc85 | 607 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
608 | |
609 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 610 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 611 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
612 | |
613 | return 0; | |
da6d8c04 DJ |
614 | } |
615 | ||
95954743 PA |
616 | static int |
617 | linux_kill (int pid) | |
0d62e5e8 | 618 | { |
95954743 | 619 | struct process_info *process; |
54a0b537 | 620 | struct lwp_info *lwp; |
95954743 | 621 | struct thread_info *thread; |
fd500816 | 622 | int wstat; |
95954743 | 623 | int lwpid; |
fd500816 | 624 | |
95954743 PA |
625 | process = find_process_pid (pid); |
626 | if (process == NULL) | |
627 | return -1; | |
9d606399 | 628 | |
95954743 | 629 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 630 | |
54a0b537 | 631 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 632 | thread in the list, so do so now. */ |
95954743 PA |
633 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
634 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
635 | |
636 | if (debug_threads) | |
95954743 PA |
637 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
638 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
639 | |
640 | /* If we're killing a running inferior, make sure it is stopped | |
641 | first, as PTRACE_KILL will not work otherwise. */ | |
642 | if (!lwp->stopped) | |
643 | send_sigstop (&lwp->head); | |
644 | ||
fd500816 DJ |
645 | do |
646 | { | |
bd99dc85 | 647 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
648 | |
649 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
650 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
651 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 652 | |
bd99dc85 | 653 | delete_lwp (lwp); |
5091eb23 | 654 | linux_remove_process (process); |
95954743 | 655 | return 0; |
0d62e5e8 DJ |
656 | } |
657 | ||
95954743 PA |
658 | static int |
659 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
660 | { |
661 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 662 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
663 | int pid = * (int *) args; |
664 | ||
665 | if (ptid_get_pid (entry->id) != pid) | |
666 | return 0; | |
6ad8ae5c | 667 | |
bd99dc85 PA |
668 | /* If we're detaching from a running inferior, make sure it is |
669 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
670 | if (!lwp->stopped) | |
671 | { | |
95954743 | 672 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
673 | |
674 | stopping_threads = 1; | |
675 | send_sigstop (&lwp->head); | |
676 | ||
677 | /* If this detects a new thread through a clone event, the new | |
678 | thread is appended to the end of the lwp list, so we'll | |
679 | eventually detach from it. */ | |
680 | wait_for_sigstop (&lwp->head); | |
681 | stopping_threads = 0; | |
682 | ||
683 | /* If LWP exits while we're trying to stop it, there's nothing | |
684 | left to do. */ | |
95954743 | 685 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 686 | if (lwp == NULL) |
95954743 | 687 | return 0; |
bd99dc85 PA |
688 | } |
689 | ||
ae13219e DJ |
690 | /* Make sure the process isn't stopped at a breakpoint that's |
691 | no longer there. */ | |
54a0b537 | 692 | check_removed_breakpoint (lwp); |
ae13219e DJ |
693 | |
694 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
695 | sure we take care of that now. This isn't absolutely guaranteed | |
696 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 697 | if (lwp->stop_expected) |
ae13219e | 698 | { |
bd99dc85 | 699 | int wstat; |
ae13219e | 700 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
701 | lwp->stop_expected = 0; |
702 | if (lwp->stopped) | |
2acc282a | 703 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 704 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
705 | } |
706 | ||
707 | /* Flush any pending changes to the process's registers. */ | |
708 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 709 | get_lwp_thread (lwp)); |
ae13219e DJ |
710 | |
711 | /* Finally, let it resume. */ | |
bd99dc85 PA |
712 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
713 | ||
714 | delete_lwp (lwp); | |
95954743 | 715 | return 0; |
6ad8ae5c DJ |
716 | } |
717 | ||
dd6953e1 | 718 | static int |
95954743 | 719 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 720 | { |
95954743 PA |
721 | int *pid_p = args; |
722 | ||
723 | if (ptid_get_pid (entry->id) == *pid_p) | |
724 | return 1; | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | static int | |
730 | linux_detach (int pid) | |
731 | { | |
732 | struct process_info *process; | |
733 | ||
734 | process = find_process_pid (pid); | |
735 | if (process == NULL) | |
736 | return -1; | |
737 | ||
738 | current_inferior = | |
739 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
740 | ||
ae13219e | 741 | delete_all_breakpoints (); |
95954743 | 742 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
5091eb23 | 743 | linux_remove_process (process); |
dd6953e1 | 744 | return 0; |
6ad8ae5c DJ |
745 | } |
746 | ||
444d6139 | 747 | static void |
95954743 | 748 | linux_join (int pid) |
444d6139 | 749 | { |
444d6139 | 750 | int status, ret; |
95954743 | 751 | struct process_info *process; |
bd99dc85 | 752 | |
95954743 PA |
753 | process = find_process_pid (pid); |
754 | if (process == NULL) | |
755 | return; | |
444d6139 PA |
756 | |
757 | do { | |
95954743 | 758 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
759 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
760 | break; | |
761 | } while (ret != -1 || errno != ECHILD); | |
762 | } | |
763 | ||
6ad8ae5c | 764 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 765 | static int |
95954743 | 766 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 767 | { |
95954743 PA |
768 | struct lwp_info *lwp = find_lwp_pid (ptid); |
769 | ||
770 | /* We assume we always know if a thread exits. If a whole process | |
771 | exited but we still haven't been able to report it to GDB, we'll | |
772 | hold on to the last lwp of the dead process. */ | |
773 | if (lwp != NULL) | |
774 | return !lwp->dead; | |
0d62e5e8 DJ |
775 | else |
776 | return 0; | |
777 | } | |
778 | ||
779 | /* Return nonzero if this process stopped at a breakpoint which | |
780 | no longer appears to be inserted. Also adjust the PC | |
781 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 782 | static int |
54a0b537 | 783 | check_removed_breakpoint (struct lwp_info *event_child) |
da6d8c04 | 784 | { |
0d62e5e8 DJ |
785 | CORE_ADDR stop_pc; |
786 | struct thread_info *saved_inferior; | |
787 | ||
788 | if (event_child->pending_is_breakpoint == 0) | |
789 | return 0; | |
790 | ||
791 | if (debug_threads) | |
54a0b537 | 792 | fprintf (stderr, "Checking for breakpoint in lwp %ld.\n", |
bd99dc85 | 793 | lwpid_of (event_child)); |
0d62e5e8 DJ |
794 | |
795 | saved_inferior = current_inferior; | |
54a0b537 | 796 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 DJ |
797 | |
798 | stop_pc = get_stop_pc (); | |
799 | ||
800 | /* If the PC has changed since we stopped, then we shouldn't do | |
801 | anything. This happens if, for instance, GDB handled the | |
802 | decr_pc_after_break subtraction itself. */ | |
803 | if (stop_pc != event_child->pending_stop_pc) | |
804 | { | |
805 | if (debug_threads) | |
ae13219e DJ |
806 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
807 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
808 | |
809 | event_child->pending_is_breakpoint = 0; | |
810 | current_inferior = saved_inferior; | |
811 | return 0; | |
812 | } | |
813 | ||
814 | /* If the breakpoint is still there, we will report hitting it. */ | |
815 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
816 | { | |
817 | if (debug_threads) | |
818 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
819 | current_inferior = saved_inferior; | |
820 | return 0; | |
821 | } | |
822 | ||
823 | if (debug_threads) | |
824 | fprintf (stderr, "Removed breakpoint.\n"); | |
825 | ||
826 | /* For decr_pc_after_break targets, here is where we perform the | |
827 | decrement. We go immediately from this function to resuming, | |
828 | and can not safely call get_stop_pc () again. */ | |
829 | if (the_low_target.set_pc != NULL) | |
47c0c975 DE |
830 | { |
831 | if (debug_threads) | |
832 | fprintf (stderr, "Set pc to 0x%lx\n", (long) stop_pc); | |
833 | (*the_low_target.set_pc) (stop_pc); | |
834 | } | |
0d62e5e8 DJ |
835 | |
836 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 837 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
838 | event_child->status_pending_p = 0; |
839 | event_child->status_pending = 0; | |
840 | ||
841 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
842 | return 1; |
843 | } | |
844 | ||
54a0b537 PA |
845 | /* Return 1 if this lwp has an interesting status pending. This |
846 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 847 | static int |
95954743 | 848 | status_pending_p (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 849 | { |
54a0b537 | 850 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 PA |
851 | ptid_t ptid = * (ptid_t *) arg; |
852 | ||
853 | /* Check if we're only interested in events from a specific process | |
854 | or its lwps. */ | |
855 | if (!ptid_equal (minus_one_ptid, ptid) | |
856 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
857 | return 0; | |
0d62e5e8 | 858 | |
bd99dc85 | 859 | if (lwp->status_pending_p && !lwp->suspended) |
54a0b537 | 860 | if (check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
861 | { |
862 | /* This thread was stopped at a breakpoint, and the breakpoint | |
863 | is now gone. We were told to continue (or step...) all threads, | |
864 | so GDB isn't trying to single-step past this breakpoint. | |
865 | So instead of reporting the old SIGTRAP, pretend we got to | |
866 | the breakpoint just after it was removed instead of just | |
867 | before; resume the process. */ | |
2acc282a | 868 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
0d62e5e8 DJ |
869 | return 0; |
870 | } | |
871 | ||
bd99dc85 | 872 | return (lwp->status_pending_p && !lwp->suspended); |
0d62e5e8 DJ |
873 | } |
874 | ||
95954743 PA |
875 | static int |
876 | same_lwp (struct inferior_list_entry *entry, void *data) | |
877 | { | |
878 | ptid_t ptid = *(ptid_t *) data; | |
879 | int lwp; | |
880 | ||
881 | if (ptid_get_lwp (ptid) != 0) | |
882 | lwp = ptid_get_lwp (ptid); | |
883 | else | |
884 | lwp = ptid_get_pid (ptid); | |
885 | ||
886 | if (ptid_get_lwp (entry->id) == lwp) | |
887 | return 1; | |
888 | ||
889 | return 0; | |
890 | } | |
891 | ||
892 | struct lwp_info * | |
893 | find_lwp_pid (ptid_t ptid) | |
894 | { | |
895 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
896 | } | |
897 | ||
bd99dc85 | 898 | static struct lwp_info * |
95954743 | 899 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 900 | { |
0d62e5e8 | 901 | int ret; |
95954743 | 902 | int to_wait_for = -1; |
bd99dc85 | 903 | struct lwp_info *child = NULL; |
0d62e5e8 | 904 | |
bd99dc85 | 905 | if (debug_threads) |
95954743 PA |
906 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
907 | ||
908 | if (ptid_equal (ptid, minus_one_ptid)) | |
909 | to_wait_for = -1; /* any child */ | |
910 | else | |
911 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 912 | |
bd99dc85 | 913 | options |= __WALL; |
0d62e5e8 | 914 | |
bd99dc85 | 915 | retry: |
0d62e5e8 | 916 | |
bd99dc85 PA |
917 | ret = my_waitpid (to_wait_for, wstatp, options); |
918 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
919 | return NULL; | |
920 | else if (ret == -1) | |
921 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
922 | |
923 | if (debug_threads | |
924 | && (!WIFSTOPPED (*wstatp) | |
925 | || (WSTOPSIG (*wstatp) != 32 | |
926 | && WSTOPSIG (*wstatp) != 33))) | |
927 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
928 | ||
95954743 | 929 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 930 | |
24a09b5f DJ |
931 | /* If we didn't find a process, one of two things presumably happened: |
932 | - A process we started and then detached from has exited. Ignore it. | |
933 | - A process we are controlling has forked and the new child's stop | |
934 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 935 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
936 | { |
937 | add_pid_to_list (&stopped_pids, ret); | |
938 | goto retry; | |
939 | } | |
bd99dc85 | 940 | else if (child == NULL) |
24a09b5f DJ |
941 | goto retry; |
942 | ||
bd99dc85 PA |
943 | child->stopped = 1; |
944 | child->pending_is_breakpoint = 0; | |
0d62e5e8 | 945 | |
bd99dc85 | 946 | child->last_status = *wstatp; |
32ca6d61 | 947 | |
d61ddec4 UW |
948 | /* Architecture-specific setup after inferior is running. |
949 | This needs to happen after we have attached to the inferior | |
950 | and it is stopped for the first time, but before we access | |
951 | any inferior registers. */ | |
952 | if (new_inferior) | |
953 | { | |
954 | the_low_target.arch_setup (); | |
52fa2412 UW |
955 | #ifdef HAVE_LINUX_REGSETS |
956 | memset (disabled_regsets, 0, num_regsets); | |
957 | #endif | |
d61ddec4 UW |
958 | new_inferior = 0; |
959 | } | |
960 | ||
0d62e5e8 | 961 | if (debug_threads |
47c0c975 DE |
962 | && WIFSTOPPED (*wstatp) |
963 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 964 | { |
896c7fbb | 965 | struct thread_info *saved_inferior = current_inferior; |
47c0c975 DE |
966 | CORE_ADDR pc; |
967 | ||
0d62e5e8 | 968 | current_inferior = (struct thread_info *) |
95954743 | 969 | find_inferior_id (&all_threads, child->head.id); |
47c0c975 DE |
970 | pc = (*the_low_target.get_pc) (); |
971 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); | |
896c7fbb | 972 | current_inferior = saved_inferior; |
0d62e5e8 | 973 | } |
bd99dc85 PA |
974 | |
975 | return child; | |
0d62e5e8 | 976 | } |
611cb4a5 | 977 | |
bd99dc85 PA |
978 | /* Wait for an event from child PID. If PID is -1, wait for any |
979 | child. Store the stop status through the status pointer WSTAT. | |
980 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
981 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
982 | the stopped child otherwise. */ | |
983 | ||
0d62e5e8 | 984 | static int |
95954743 | 985 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 DJ |
986 | { |
987 | CORE_ADDR stop_pc; | |
bd99dc85 | 988 | struct lwp_info *event_child = NULL; |
b65d95c5 | 989 | int bp_status; |
bd99dc85 | 990 | struct lwp_info *requested_child = NULL; |
0d62e5e8 | 991 | |
95954743 | 992 | /* Check for a lwp with a pending status. */ |
0d62e5e8 DJ |
993 | /* It is possible that the user changed the pending task's registers since |
994 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 995 | (in check_removed_breakpoint); signals should be reported anyway. */ |
bd99dc85 | 996 | |
95954743 PA |
997 | if (ptid_equal (ptid, minus_one_ptid) |
998 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 999 | { |
54a0b537 | 1000 | event_child = (struct lwp_info *) |
95954743 | 1001 | find_inferior (&all_lwps, status_pending_p, &ptid); |
0d62e5e8 | 1002 | if (debug_threads && event_child) |
bd99dc85 | 1003 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1004 | } |
1005 | else | |
1006 | { | |
95954743 | 1007 | requested_child = find_lwp_pid (ptid); |
bd99dc85 PA |
1008 | if (requested_child->status_pending_p |
1009 | && !check_removed_breakpoint (requested_child)) | |
1010 | event_child = requested_child; | |
0d62e5e8 | 1011 | } |
611cb4a5 | 1012 | |
0d62e5e8 DJ |
1013 | if (event_child != NULL) |
1014 | { | |
bd99dc85 PA |
1015 | if (debug_threads) |
1016 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1017 | lwpid_of (event_child), event_child->status_pending); | |
1018 | *wstat = event_child->status_pending; | |
1019 | event_child->status_pending_p = 0; | |
1020 | event_child->status_pending = 0; | |
1021 | current_inferior = get_lwp_thread (event_child); | |
1022 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1023 | } |
1024 | ||
1025 | /* We only enter this loop if no process has a pending wait status. Thus | |
1026 | any action taken in response to a wait status inside this loop is | |
1027 | responding as soon as we detect the status, not after any pending | |
1028 | events. */ | |
1029 | while (1) | |
1030 | { | |
95954743 | 1031 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1032 | |
bd99dc85 PA |
1033 | if ((options & WNOHANG) && event_child == NULL) |
1034 | return 0; | |
0d62e5e8 DJ |
1035 | |
1036 | if (event_child == NULL) | |
1037 | error ("event from unknown child"); | |
611cb4a5 | 1038 | |
bd99dc85 | 1039 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1040 | |
89be2091 | 1041 | /* Check for thread exit. */ |
bd99dc85 | 1042 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1043 | { |
89be2091 | 1044 | if (debug_threads) |
95954743 | 1045 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1046 | |
1047 | /* If the last thread is exiting, just return. */ | |
95954743 | 1048 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1049 | { |
1050 | if (debug_threads) | |
95954743 PA |
1051 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1052 | lwpid_of (event_child)); | |
bd99dc85 PA |
1053 | return lwpid_of (event_child); |
1054 | } | |
89be2091 | 1055 | |
bd99dc85 | 1056 | delete_lwp (event_child); |
89be2091 | 1057 | |
bd99dc85 PA |
1058 | if (!non_stop) |
1059 | { | |
1060 | current_inferior = (struct thread_info *) all_threads.head; | |
1061 | if (debug_threads) | |
1062 | fprintf (stderr, "Current inferior is now %ld\n", | |
1063 | lwpid_of (get_thread_lwp (current_inferior))); | |
1064 | } | |
1065 | else | |
1066 | { | |
1067 | current_inferior = NULL; | |
1068 | if (debug_threads) | |
1069 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1070 | } | |
89be2091 DJ |
1071 | |
1072 | /* If we were waiting for this particular child to do something... | |
1073 | well, it did something. */ | |
bd99dc85 | 1074 | if (requested_child != NULL) |
95954743 | 1075 | return lwpid_of (event_child); |
89be2091 DJ |
1076 | |
1077 | /* Wait for a more interesting event. */ | |
1078 | continue; | |
1079 | } | |
1080 | ||
a6dbe5df PA |
1081 | if (event_child->must_set_ptrace_flags) |
1082 | { | |
1083 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
1084 | 0, PTRACE_O_TRACECLONE); | |
1085 | event_child->must_set_ptrace_flags = 0; | |
1086 | } | |
1087 | ||
bd99dc85 PA |
1088 | if (WIFSTOPPED (*wstat) |
1089 | && WSTOPSIG (*wstat) == SIGSTOP | |
89be2091 DJ |
1090 | && event_child->stop_expected) |
1091 | { | |
1092 | if (debug_threads) | |
1093 | fprintf (stderr, "Expected stop.\n"); | |
1094 | event_child->stop_expected = 0; | |
2acc282a | 1095 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
89be2091 DJ |
1096 | continue; |
1097 | } | |
1098 | ||
bd99dc85 PA |
1099 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1100 | && *wstat >> 16 != 0) | |
24a09b5f | 1101 | { |
bd99dc85 | 1102 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1103 | continue; |
1104 | } | |
1105 | ||
89be2091 DJ |
1106 | /* If GDB is not interested in this signal, don't stop other |
1107 | threads, and don't report it to GDB. Just resume the | |
1108 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1109 | signals as well as any that GDB specifically requested we |
1110 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1111 | and do not ignore signals when stepping - they may require | |
1112 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1113 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1114 | thread library? */ | |
bd99dc85 | 1115 | if (WIFSTOPPED (*wstat) |
69f223ed | 1116 | && !event_child->stepping |
24a09b5f DJ |
1117 | && ( |
1118 | #ifdef USE_THREAD_DB | |
95954743 | 1119 | (current_process ()->private->thread_db_active |
bd99dc85 PA |
1120 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1121 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1122 | || |
1123 | #endif | |
bd99dc85 PA |
1124 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
1125 | && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
1126 | { |
1127 | siginfo_t info, *info_p; | |
1128 | ||
1129 | if (debug_threads) | |
24a09b5f | 1130 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1131 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1132 | |
bd99dc85 | 1133 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1134 | info_p = &info; |
1135 | else | |
1136 | info_p = NULL; | |
2acc282a | 1137 | linux_resume_one_lwp (event_child, |
54a0b537 | 1138 | event_child->stepping, |
bd99dc85 | 1139 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1140 | continue; |
0d62e5e8 | 1141 | } |
611cb4a5 | 1142 | |
0d62e5e8 DJ |
1143 | /* If this event was not handled above, and is not a SIGTRAP, report |
1144 | it. */ | |
bd99dc85 PA |
1145 | if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP) |
1146 | return lwpid_of (event_child); | |
611cb4a5 | 1147 | |
0d62e5e8 DJ |
1148 | /* If this target does not support breakpoints, we simply report the |
1149 | SIGTRAP; it's of no concern to us. */ | |
1150 | if (the_low_target.get_pc == NULL) | |
bd99dc85 | 1151 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1152 | |
1153 | stop_pc = get_stop_pc (); | |
1154 | ||
1155 | /* bp_reinsert will only be set if we were single-stepping. | |
1156 | Notice that we will resume the process after hitting | |
1157 | a gdbserver breakpoint; single-stepping to/over one | |
1158 | is not supported (yet). */ | |
1159 | if (event_child->bp_reinsert != 0) | |
1160 | { | |
1161 | if (debug_threads) | |
1162 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
1163 | reinsert_breakpoint (event_child->bp_reinsert); | |
1164 | event_child->bp_reinsert = 0; | |
1165 | ||
1166 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
2acc282a | 1167 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
0d62e5e8 DJ |
1168 | continue; |
1169 | } | |
1170 | ||
b65d95c5 | 1171 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 1172 | |
b65d95c5 | 1173 | if (bp_status != 0) |
0d62e5e8 | 1174 | { |
b65d95c5 DJ |
1175 | if (debug_threads) |
1176 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1177 | ||
0d62e5e8 | 1178 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 1179 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
1180 | adjustment for us at the appropriate time. */ |
1181 | event_child->pending_is_breakpoint = 1; | |
1182 | event_child->pending_stop_pc = stop_pc; | |
1183 | ||
b65d95c5 | 1184 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
1185 | loop instead of simply replacing the breakpoint right away, |
1186 | in order to not lose signals sent to the thread that hit the | |
1187 | breakpoint. Unfortunately this increases the window where another | |
1188 | thread could sneak past the removed breakpoint. For the current | |
1189 | use of server-side breakpoints (thread creation) this is | |
1190 | acceptable; but it needs to be considered before this breakpoint | |
1191 | mechanism can be used in more general ways. For some breakpoints | |
1192 | it may be necessary to stop all other threads, but that should | |
1193 | be avoided where possible. | |
1194 | ||
1195 | If breakpoint_reinsert_addr is NULL, that means that we can | |
1196 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
1197 | mark it for reinsertion, and single-step. | |
1198 | ||
1199 | Otherwise, call the target function to figure out where we need | |
1200 | our temporary breakpoint, create it, and continue executing this | |
1201 | process. */ | |
bd99dc85 PA |
1202 | |
1203 | /* NOTE: we're lifting breakpoints in non-stop mode. This | |
1204 | is currently only used for thread event breakpoints, so | |
1205 | it isn't that bad as long as we have PTRACE_EVENT_CLONE | |
1206 | events. */ | |
b65d95c5 DJ |
1207 | if (bp_status == 2) |
1208 | /* No need to reinsert. */ | |
2acc282a | 1209 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
b65d95c5 | 1210 | else if (the_low_target.breakpoint_reinsert_addr == NULL) |
0d62e5e8 DJ |
1211 | { |
1212 | event_child->bp_reinsert = stop_pc; | |
1213 | uninsert_breakpoint (stop_pc); | |
2acc282a | 1214 | linux_resume_one_lwp (event_child, 1, 0, NULL); |
0d62e5e8 DJ |
1215 | } |
1216 | else | |
1217 | { | |
1218 | reinsert_breakpoint_by_bp | |
1219 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
2acc282a | 1220 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
611cb4a5 | 1221 | } |
0d62e5e8 DJ |
1222 | |
1223 | continue; | |
1224 | } | |
1225 | ||
b65d95c5 DJ |
1226 | if (debug_threads) |
1227 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
1228 | ||
0d62e5e8 | 1229 | /* If we were single-stepping, we definitely want to report the |
c35fafde PA |
1230 | SIGTRAP. Although the single-step operation has completed, |
1231 | do not clear clear the stepping flag yet; we need to check it | |
1232 | in wait_for_sigstop. */ | |
0d62e5e8 | 1233 | if (event_child->stepping) |
bd99dc85 | 1234 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1235 | |
1236 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
1237 | Check if it is a breakpoint, and if so mark the process information | |
1238 | accordingly. This will handle both the necessary fiddling with the | |
1239 | PC on decr_pc_after_break targets and suppressing extra threads | |
1240 | hitting a breakpoint if two hit it at once and then GDB removes it | |
1241 | after the first is reported. Arguably it would be better to report | |
1242 | multiple threads hitting breakpoints simultaneously, but the current | |
1243 | remote protocol does not allow this. */ | |
1244 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
1245 | { | |
1246 | event_child->pending_is_breakpoint = 1; | |
1247 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
1248 | } |
1249 | ||
bd99dc85 | 1250 | return lwpid_of (event_child); |
611cb4a5 | 1251 | } |
0d62e5e8 | 1252 | |
611cb4a5 DJ |
1253 | /* NOTREACHED */ |
1254 | return 0; | |
1255 | } | |
1256 | ||
95954743 PA |
1257 | static int |
1258 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1259 | { | |
1260 | ptid_t wait_ptid; | |
1261 | ||
1262 | if (ptid_is_pid (ptid)) | |
1263 | { | |
1264 | /* A request to wait for a specific tgid. This is not possible | |
1265 | with waitpid, so instead, we wait for any child, and leave | |
1266 | children we're not interested in right now with a pending | |
1267 | status to report later. */ | |
1268 | wait_ptid = minus_one_ptid; | |
1269 | } | |
1270 | else | |
1271 | wait_ptid = ptid; | |
1272 | ||
1273 | while (1) | |
1274 | { | |
1275 | int event_pid; | |
1276 | ||
1277 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1278 | ||
1279 | if (event_pid > 0 | |
1280 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1281 | { | |
1282 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1283 | ||
1284 | if (! WIFSTOPPED (*wstat)) | |
1285 | mark_lwp_dead (event_child, *wstat); | |
1286 | else | |
1287 | { | |
1288 | event_child->status_pending_p = 1; | |
1289 | event_child->status_pending = *wstat; | |
1290 | } | |
1291 | } | |
1292 | else | |
1293 | return event_pid; | |
1294 | } | |
1295 | } | |
1296 | ||
0d62e5e8 | 1297 | /* Wait for process, returns status. */ |
da6d8c04 | 1298 | |
95954743 PA |
1299 | static ptid_t |
1300 | linux_wait_1 (ptid_t ptid, | |
1301 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1302 | { |
e5f1222d | 1303 | int w; |
bd99dc85 PA |
1304 | struct thread_info *thread = NULL; |
1305 | struct lwp_info *lwp = NULL; | |
1306 | int options; | |
bd99dc85 PA |
1307 | int pid; |
1308 | ||
1309 | /* Translate generic target options into linux options. */ | |
1310 | options = __WALL; | |
1311 | if (target_options & TARGET_WNOHANG) | |
1312 | options |= WNOHANG; | |
0d62e5e8 DJ |
1313 | |
1314 | retry: | |
bd99dc85 PA |
1315 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1316 | ||
0d62e5e8 DJ |
1317 | /* If we were only supposed to resume one thread, only wait for |
1318 | that thread - if it's still alive. If it died, however - which | |
1319 | can happen if we're coming from the thread death case below - | |
1320 | then we need to make sure we restart the other threads. We could | |
1321 | pick a thread at random or restart all; restarting all is less | |
1322 | arbitrary. */ | |
95954743 PA |
1323 | if (!non_stop |
1324 | && !ptid_equal (cont_thread, null_ptid) | |
1325 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1326 | { |
bd99dc85 PA |
1327 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1328 | cont_thread); | |
0d62e5e8 DJ |
1329 | |
1330 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1331 | if (thread == NULL) |
64386c31 DJ |
1332 | { |
1333 | struct thread_resume resume_info; | |
95954743 | 1334 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1335 | resume_info.kind = resume_continue; |
1336 | resume_info.sig = 0; | |
2bd7c093 | 1337 | linux_resume (&resume_info, 1); |
64386c31 | 1338 | } |
bd99dc85 | 1339 | else |
95954743 | 1340 | ptid = cont_thread; |
0d62e5e8 | 1341 | } |
da6d8c04 | 1342 | |
95954743 | 1343 | pid = linux_wait_for_event (ptid, &w, options); |
bd99dc85 | 1344 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1345 | return null_ptid; |
bd99dc85 PA |
1346 | |
1347 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1348 | |
0d62e5e8 DJ |
1349 | /* If we are waiting for a particular child, and it exited, |
1350 | linux_wait_for_event will return its exit status. Similarly if | |
1351 | the last child exited. If this is not the last child, however, | |
1352 | do not report it as exited until there is a 'thread exited' response | |
1353 | available in the remote protocol. Instead, just wait for another event. | |
1354 | This should be safe, because if the thread crashed we will already | |
1355 | have reported the termination signal to GDB; that should stop any | |
1356 | in-progress stepping operations, etc. | |
1357 | ||
1358 | Report the exit status of the last thread to exit. This matches | |
1359 | LinuxThreads' behavior. */ | |
1360 | ||
95954743 | 1361 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1362 | { |
bd99dc85 | 1363 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1364 | { |
95954743 PA |
1365 | int pid = pid_of (lwp); |
1366 | struct process_info *process = find_process_pid (pid); | |
5b1c542e | 1367 | |
bd99dc85 | 1368 | delete_lwp (lwp); |
5091eb23 | 1369 | linux_remove_process (process); |
5b1c542e | 1370 | |
bd99dc85 | 1371 | current_inferior = NULL; |
5b1c542e | 1372 | |
bd99dc85 PA |
1373 | if (WIFEXITED (w)) |
1374 | { | |
1375 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1376 | ourstatus->value.integer = WEXITSTATUS (w); | |
1377 | ||
1378 | if (debug_threads) | |
1379 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1380 | } | |
1381 | else | |
1382 | { | |
1383 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1384 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1385 | ||
1386 | if (debug_threads) | |
1387 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1388 | ||
1389 | } | |
5b1c542e | 1390 | |
95954743 | 1391 | return pid_to_ptid (pid); |
0d62e5e8 | 1392 | } |
da6d8c04 | 1393 | } |
0d62e5e8 | 1394 | else |
da6d8c04 | 1395 | { |
0d62e5e8 DJ |
1396 | if (!WIFSTOPPED (w)) |
1397 | goto retry; | |
da6d8c04 DJ |
1398 | } |
1399 | ||
bd99dc85 PA |
1400 | /* In all-stop, stop all threads. Be careful to only do this if |
1401 | we're about to report an event to GDB. */ | |
1402 | if (!non_stop) | |
1403 | stop_all_lwps (); | |
1404 | ||
5b1c542e | 1405 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1406 | |
bd99dc85 PA |
1407 | if (lwp->suspended && WSTOPSIG (w) == SIGSTOP) |
1408 | { | |
1409 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1410 | and it stopped cleanly, so report as SIG0. The use of | |
1411 | SIGSTOP is an implementation detail. */ | |
1412 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1413 | } | |
1414 | else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP) | |
1415 | { | |
1416 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1417 | but, it stopped for other reasons. Set stop_expected so the | |
1418 | pending SIGSTOP is ignored and the LWP is resumed. */ | |
1419 | lwp->stop_expected = 1; | |
1420 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1421 | } | |
1422 | else | |
1423 | { | |
1424 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1425 | } | |
1426 | ||
1427 | if (debug_threads) | |
95954743 PA |
1428 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
1429 | target_pid_to_str (lwp->head.id), | |
bd99dc85 PA |
1430 | ourstatus->kind, |
1431 | ourstatus->value.sig); | |
1432 | ||
95954743 | 1433 | return lwp->head.id; |
bd99dc85 PA |
1434 | } |
1435 | ||
1436 | /* Get rid of any pending event in the pipe. */ | |
1437 | static void | |
1438 | async_file_flush (void) | |
1439 | { | |
1440 | int ret; | |
1441 | char buf; | |
1442 | ||
1443 | do | |
1444 | ret = read (linux_event_pipe[0], &buf, 1); | |
1445 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1446 | } | |
1447 | ||
1448 | /* Put something in the pipe, so the event loop wakes up. */ | |
1449 | static void | |
1450 | async_file_mark (void) | |
1451 | { | |
1452 | int ret; | |
1453 | ||
1454 | async_file_flush (); | |
1455 | ||
1456 | do | |
1457 | ret = write (linux_event_pipe[1], "+", 1); | |
1458 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1459 | ||
1460 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1461 | be awakened anyway. */ | |
1462 | } | |
1463 | ||
95954743 PA |
1464 | static ptid_t |
1465 | linux_wait (ptid_t ptid, | |
1466 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1467 | { |
95954743 | 1468 | ptid_t event_ptid; |
bd99dc85 PA |
1469 | |
1470 | if (debug_threads) | |
95954743 | 1471 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1472 | |
1473 | /* Flush the async file first. */ | |
1474 | if (target_is_async_p ()) | |
1475 | async_file_flush (); | |
1476 | ||
95954743 | 1477 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1478 | |
1479 | /* If at least one stop was reported, there may be more. A single | |
1480 | SIGCHLD can signal more than one child stop. */ | |
1481 | if (target_is_async_p () | |
1482 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1483 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1484 | async_file_mark (); |
1485 | ||
1486 | return event_ptid; | |
da6d8c04 DJ |
1487 | } |
1488 | ||
fd500816 DJ |
1489 | /* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if |
1490 | thread groups are in use, we need to use tkill. */ | |
1491 | ||
1492 | static int | |
a1928bad | 1493 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 DJ |
1494 | { |
1495 | static int tkill_failed; | |
1496 | ||
1497 | errno = 0; | |
1498 | ||
1499 | #ifdef SYS_tkill | |
1500 | if (!tkill_failed) | |
1501 | { | |
1502 | int ret = syscall (SYS_tkill, lwpid, signo); | |
1503 | if (errno != ENOSYS) | |
1b3f6016 | 1504 | return ret; |
fd500816 DJ |
1505 | errno = 0; |
1506 | tkill_failed = 1; | |
1507 | } | |
1508 | #endif | |
1509 | ||
1510 | return kill (lwpid, signo); | |
1511 | } | |
1512 | ||
0d62e5e8 DJ |
1513 | static void |
1514 | send_sigstop (struct inferior_list_entry *entry) | |
1515 | { | |
54a0b537 | 1516 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1517 | int pid; |
0d62e5e8 | 1518 | |
54a0b537 | 1519 | if (lwp->stopped) |
0d62e5e8 DJ |
1520 | return; |
1521 | ||
bd99dc85 PA |
1522 | pid = lwpid_of (lwp); |
1523 | ||
0d62e5e8 DJ |
1524 | /* If we already have a pending stop signal for this process, don't |
1525 | send another. */ | |
54a0b537 | 1526 | if (lwp->stop_expected) |
0d62e5e8 | 1527 | { |
ae13219e | 1528 | if (debug_threads) |
bd99dc85 | 1529 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e DJ |
1530 | |
1531 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1532 | will receive the SIGSTOP event (instead of silently resuming and | |
1533 | waiting again). It'll be reset below. */ | |
54a0b537 | 1534 | lwp->stop_expected = 0; |
0d62e5e8 DJ |
1535 | return; |
1536 | } | |
1537 | ||
1538 | if (debug_threads) | |
bd99dc85 | 1539 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1540 | |
bd99dc85 | 1541 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1542 | } |
1543 | ||
95954743 PA |
1544 | static void |
1545 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
1546 | { | |
1547 | /* It's dead, really. */ | |
1548 | lwp->dead = 1; | |
1549 | ||
1550 | /* Store the exit status for later. */ | |
1551 | lwp->status_pending_p = 1; | |
1552 | lwp->status_pending = wstat; | |
1553 | ||
1554 | /* So that check_removed_breakpoint doesn't try to figure out if | |
1555 | this is stopped at a breakpoint. */ | |
1556 | lwp->pending_is_breakpoint = 0; | |
1557 | ||
1558 | /* Prevent trying to stop it. */ | |
1559 | lwp->stopped = 1; | |
1560 | ||
1561 | /* No further stops are expected from a dead lwp. */ | |
1562 | lwp->stop_expected = 0; | |
1563 | } | |
1564 | ||
0d62e5e8 DJ |
1565 | static void |
1566 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1567 | { | |
54a0b537 | 1568 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1569 | struct thread_info *saved_inferior; |
a1928bad | 1570 | int wstat; |
95954743 PA |
1571 | ptid_t saved_tid; |
1572 | ptid_t ptid; | |
0d62e5e8 | 1573 | |
54a0b537 | 1574 | if (lwp->stopped) |
0d62e5e8 DJ |
1575 | return; |
1576 | ||
1577 | saved_inferior = current_inferior; | |
bd99dc85 PA |
1578 | if (saved_inferior != NULL) |
1579 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1580 | else | |
95954743 | 1581 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 1582 | |
95954743 | 1583 | ptid = lwp->head.id; |
bd99dc85 PA |
1584 | |
1585 | linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
1586 | |
1587 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1588 | and record the pending SIGSTOP. If the process exited, just | |
1589 | return. */ | |
1590 | if (WIFSTOPPED (wstat) | |
1591 | && WSTOPSIG (wstat) != SIGSTOP) | |
1592 | { | |
1593 | if (debug_threads) | |
24a09b5f | 1594 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
bd99dc85 | 1595 | lwpid_of (lwp), wstat); |
c35fafde PA |
1596 | |
1597 | /* Do not leave a pending single-step finish to be reported to | |
1598 | the client. The client will give us a new action for this | |
1599 | thread, possibly a continue request --- otherwise, the client | |
1600 | would consider this pending SIGTRAP reported later a spurious | |
1601 | signal. */ | |
1602 | if (WSTOPSIG (wstat) == SIGTRAP | |
1603 | && lwp->stepping | |
1604 | && !linux_stopped_by_watchpoint ()) | |
1605 | { | |
1606 | if (debug_threads) | |
1607 | fprintf (stderr, " single-step SIGTRAP ignored\n"); | |
1608 | } | |
1609 | else | |
1610 | { | |
1611 | lwp->status_pending_p = 1; | |
1612 | lwp->status_pending = wstat; | |
1613 | } | |
54a0b537 | 1614 | lwp->stop_expected = 1; |
0d62e5e8 | 1615 | } |
95954743 PA |
1616 | else if (!WIFSTOPPED (wstat)) |
1617 | { | |
1618 | if (debug_threads) | |
1619 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
1620 | lwpid_of (lwp)); | |
1621 | ||
1622 | /* Leave this status pending for the next time we're able to | |
1623 | report it. In the mean time, we'll report this lwp as dead | |
1624 | to GDB, so GDB doesn't try to read registers and memory from | |
1625 | it. */ | |
1626 | mark_lwp_dead (lwp, wstat); | |
1627 | } | |
0d62e5e8 | 1628 | |
bd99dc85 | 1629 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
1630 | current_inferior = saved_inferior; |
1631 | else | |
1632 | { | |
1633 | if (debug_threads) | |
1634 | fprintf (stderr, "Previously current thread died.\n"); | |
1635 | ||
bd99dc85 PA |
1636 | if (non_stop) |
1637 | { | |
1638 | /* We can't change the current inferior behind GDB's back, | |
1639 | otherwise, a subsequent command may apply to the wrong | |
1640 | process. */ | |
1641 | current_inferior = NULL; | |
1642 | } | |
1643 | else | |
1644 | { | |
1645 | /* Set a valid thread as current. */ | |
1646 | set_desired_inferior (0); | |
1647 | } | |
0d62e5e8 DJ |
1648 | } |
1649 | } | |
1650 | ||
1651 | static void | |
54a0b537 | 1652 | stop_all_lwps (void) |
0d62e5e8 DJ |
1653 | { |
1654 | stopping_threads = 1; | |
54a0b537 PA |
1655 | for_each_inferior (&all_lwps, send_sigstop); |
1656 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
1657 | stopping_threads = 0; |
1658 | } | |
1659 | ||
da6d8c04 DJ |
1660 | /* Resume execution of the inferior process. |
1661 | If STEP is nonzero, single-step it. | |
1662 | If SIGNAL is nonzero, give it that signal. */ | |
1663 | ||
ce3a066d | 1664 | static void |
2acc282a | 1665 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 1666 | int step, int signal, siginfo_t *info) |
da6d8c04 | 1667 | { |
0d62e5e8 DJ |
1668 | struct thread_info *saved_inferior; |
1669 | ||
54a0b537 | 1670 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
1671 | return; |
1672 | ||
1673 | /* If we have pending signals or status, and a new signal, enqueue the | |
1674 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1675 | breakpoint; it will be picked up again below. */ | |
1676 | if (signal != 0 | |
54a0b537 PA |
1677 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
1678 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
1679 | { |
1680 | struct pending_signals *p_sig; | |
bca929d3 | 1681 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 1682 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 1683 | p_sig->signal = signal; |
32ca6d61 DJ |
1684 | if (info == NULL) |
1685 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1686 | else | |
1687 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 1688 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
1689 | } |
1690 | ||
54a0b537 | 1691 | if (lwp->status_pending_p && !check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
1692 | return; |
1693 | ||
1694 | saved_inferior = current_inferior; | |
54a0b537 | 1695 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
1696 | |
1697 | if (debug_threads) | |
1b3f6016 | 1698 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 1699 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 1700 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
1701 | |
1702 | /* This bit needs some thinking about. If we get a signal that | |
1703 | we must report while a single-step reinsert is still pending, | |
1704 | we often end up resuming the thread. It might be better to | |
1705 | (ew) allow a stack of pending events; then we could be sure that | |
1706 | the reinsert happened right away and not lose any signals. | |
1707 | ||
1708 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 1709 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
1710 | complete correctness, so it won't solve that problem. It may be |
1711 | worthwhile just to solve this one, however. */ | |
54a0b537 | 1712 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
1713 | { |
1714 | if (debug_threads) | |
54a0b537 | 1715 | fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert); |
0d62e5e8 DJ |
1716 | if (step == 0) |
1717 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1718 | step = 1; | |
1719 | ||
1720 | /* Postpone any pending signal. It was enqueued above. */ | |
1721 | signal = 0; | |
1722 | } | |
1723 | ||
54a0b537 | 1724 | check_removed_breakpoint (lwp); |
0d62e5e8 | 1725 | |
aa691b87 | 1726 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 1727 | { |
47c0c975 DE |
1728 | CORE_ADDR pc = (*the_low_target.get_pc) (); |
1729 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); | |
0d62e5e8 DJ |
1730 | } |
1731 | ||
1732 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1733 | a breakpoint. */ | |
54a0b537 | 1734 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
1735 | { |
1736 | struct pending_signals **p_sig; | |
1737 | ||
54a0b537 | 1738 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
1739 | while ((*p_sig)->prev != NULL) |
1740 | p_sig = &(*p_sig)->prev; | |
1741 | ||
1742 | signal = (*p_sig)->signal; | |
32ca6d61 | 1743 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 1744 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 1745 | |
0d62e5e8 DJ |
1746 | free (*p_sig); |
1747 | *p_sig = NULL; | |
1748 | } | |
1749 | ||
aa5ca48f DE |
1750 | if (the_low_target.prepare_to_resume != NULL) |
1751 | the_low_target.prepare_to_resume (lwp); | |
1752 | ||
0d62e5e8 | 1753 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 1754 | get_lwp_thread (lwp)); |
da6d8c04 | 1755 | errno = 0; |
54a0b537 PA |
1756 | lwp->stopped = 0; |
1757 | lwp->stepping = step; | |
bd99dc85 | 1758 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal); |
0d62e5e8 DJ |
1759 | |
1760 | current_inferior = saved_inferior; | |
da6d8c04 | 1761 | if (errno) |
3221518c UW |
1762 | { |
1763 | /* ESRCH from ptrace either means that the thread was already | |
1764 | running (an error) or that it is gone (a race condition). If | |
1765 | it's gone, we will get a notification the next time we wait, | |
1766 | so we can ignore the error. We could differentiate these | |
1767 | two, but it's tricky without waiting; the thread still exists | |
1768 | as a zombie, so sending it signal 0 would succeed. So just | |
1769 | ignore ESRCH. */ | |
1770 | if (errno == ESRCH) | |
1771 | return; | |
1772 | ||
1773 | perror_with_name ("ptrace"); | |
1774 | } | |
da6d8c04 DJ |
1775 | } |
1776 | ||
2bd7c093 PA |
1777 | struct thread_resume_array |
1778 | { | |
1779 | struct thread_resume *resume; | |
1780 | size_t n; | |
1781 | }; | |
64386c31 DJ |
1782 | |
1783 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1784 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1785 | resume request. | |
1786 | ||
1787 | This algorithm is O(threads * resume elements), but resume elements | |
1788 | is small (and will remain small at least until GDB supports thread | |
1789 | suspension). */ | |
2bd7c093 PA |
1790 | static int |
1791 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 1792 | { |
54a0b537 | 1793 | struct lwp_info *lwp; |
64386c31 | 1794 | struct thread_info *thread; |
5544ad89 | 1795 | int ndx; |
2bd7c093 | 1796 | struct thread_resume_array *r; |
64386c31 DJ |
1797 | |
1798 | thread = (struct thread_info *) entry; | |
54a0b537 | 1799 | lwp = get_thread_lwp (thread); |
2bd7c093 | 1800 | r = arg; |
64386c31 | 1801 | |
2bd7c093 | 1802 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
1803 | { |
1804 | ptid_t ptid = r->resume[ndx].thread; | |
1805 | if (ptid_equal (ptid, minus_one_ptid) | |
1806 | || ptid_equal (ptid, entry->id) | |
1807 | || (ptid_is_pid (ptid) | |
1808 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
1809 | || (ptid_get_lwp (ptid) == -1 | |
1810 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
1811 | { | |
1812 | lwp->resume = &r->resume[ndx]; | |
1813 | return 0; | |
1814 | } | |
1815 | } | |
2bd7c093 PA |
1816 | |
1817 | /* No resume action for this thread. */ | |
1818 | lwp->resume = NULL; | |
64386c31 | 1819 | |
2bd7c093 | 1820 | return 0; |
5544ad89 DJ |
1821 | } |
1822 | ||
5544ad89 | 1823 | |
bd99dc85 PA |
1824 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
1825 | static int | |
1826 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 1827 | { |
bd99dc85 | 1828 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 1829 | |
bd99dc85 PA |
1830 | /* LWPs which will not be resumed are not interesting, because |
1831 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 1832 | if (lwp->resume == NULL) |
bd99dc85 | 1833 | return 0; |
64386c31 | 1834 | |
bd99dc85 PA |
1835 | /* If this thread has a removed breakpoint, we won't have any |
1836 | events to report later, so check now. check_removed_breakpoint | |
1837 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1838 | for any thread that we are not otherwise going to resume - this | |
1839 | lets us preserve stopped status when two threads hit a breakpoint. | |
1840 | GDB removes the breakpoint to single-step a particular thread | |
1841 | past it, then re-inserts it and resumes all threads. We want | |
1842 | to report the second thread without resuming it in the interim. */ | |
1843 | if (lwp->status_pending_p) | |
1844 | check_removed_breakpoint (lwp); | |
5544ad89 | 1845 | |
bd99dc85 PA |
1846 | if (lwp->status_pending_p) |
1847 | * (int *) flag_p = 1; | |
c6ecbae5 | 1848 | |
bd99dc85 | 1849 | return 0; |
5544ad89 DJ |
1850 | } |
1851 | ||
1852 | /* This function is called once per thread. We check the thread's resume | |
1853 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 1854 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 1855 | |
bd99dc85 PA |
1856 | For threads which we aren't explicitly told otherwise, we preserve |
1857 | the stepping flag; this is used for stepping over gdbserver-placed | |
1858 | breakpoints. | |
1859 | ||
1860 | If pending_flags was set in any thread, we queue any needed | |
1861 | signals, since we won't actually resume. We already have a pending | |
1862 | event to report, so we don't need to preserve any step requests; | |
1863 | they should be re-issued if necessary. */ | |
1864 | ||
1865 | static int | |
1866 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 1867 | { |
54a0b537 | 1868 | struct lwp_info *lwp; |
5544ad89 | 1869 | struct thread_info *thread; |
bd99dc85 PA |
1870 | int step; |
1871 | int pending_flag = * (int *) arg; | |
5544ad89 DJ |
1872 | |
1873 | thread = (struct thread_info *) entry; | |
54a0b537 | 1874 | lwp = get_thread_lwp (thread); |
5544ad89 | 1875 | |
2bd7c093 | 1876 | if (lwp->resume == NULL) |
bd99dc85 | 1877 | return 0; |
5544ad89 | 1878 | |
bd99dc85 | 1879 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 1880 | { |
bd99dc85 PA |
1881 | if (debug_threads) |
1882 | fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp)); | |
1883 | ||
1884 | if (!lwp->stopped) | |
1885 | { | |
1886 | if (debug_threads) | |
95954743 | 1887 | fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
1888 | |
1889 | lwp->suspended = 1; | |
1890 | send_sigstop (&lwp->head); | |
1891 | } | |
1892 | else | |
1893 | { | |
1894 | if (debug_threads) | |
1895 | { | |
1896 | if (lwp->suspended) | |
1897 | fprintf (stderr, "already stopped/suspended LWP %ld\n", | |
1898 | lwpid_of (lwp)); | |
1899 | else | |
1900 | fprintf (stderr, "already stopped/not suspended LWP %ld\n", | |
1901 | lwpid_of (lwp)); | |
1902 | } | |
32ca6d61 | 1903 | |
bd99dc85 PA |
1904 | /* Make sure we leave the LWP suspended, so we don't try to |
1905 | resume it without GDB telling us to. FIXME: The LWP may | |
1906 | have been stopped in an internal event that was not meant | |
1907 | to be notified back to GDB (e.g., gdbserver breakpoint), | |
1908 | so we should be reporting a stop event in that case | |
1909 | too. */ | |
1910 | lwp->suspended = 1; | |
1911 | } | |
32ca6d61 | 1912 | |
bd99dc85 PA |
1913 | /* For stop requests, we're done. */ |
1914 | lwp->resume = NULL; | |
1915 | return 0; | |
5544ad89 | 1916 | } |
bd99dc85 PA |
1917 | else |
1918 | lwp->suspended = 0; | |
5544ad89 | 1919 | |
bd99dc85 PA |
1920 | /* If this thread which is about to be resumed has a pending status, |
1921 | then don't resume any threads - we can just report the pending | |
1922 | status. Make sure to queue any signals that would otherwise be | |
1923 | sent. In all-stop mode, we do this decision based on if *any* | |
1924 | thread has a pending status. */ | |
1925 | if (non_stop) | |
1926 | resume_status_pending_p (&lwp->head, &pending_flag); | |
5544ad89 | 1927 | |
bd99dc85 PA |
1928 | if (!pending_flag) |
1929 | { | |
1930 | if (debug_threads) | |
1931 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 1932 | |
95954743 | 1933 | if (ptid_equal (lwp->resume->thread, minus_one_ptid) |
bd99dc85 PA |
1934 | && lwp->stepping |
1935 | && lwp->pending_is_breakpoint) | |
1936 | step = 1; | |
1937 | else | |
1938 | step = (lwp->resume->kind == resume_step); | |
5544ad89 | 1939 | |
2acc282a | 1940 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
1941 | } |
1942 | else | |
1943 | { | |
1944 | if (debug_threads) | |
1945 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 1946 | |
bd99dc85 PA |
1947 | /* If we have a new signal, enqueue the signal. */ |
1948 | if (lwp->resume->sig != 0) | |
1949 | { | |
1950 | struct pending_signals *p_sig; | |
1951 | p_sig = xmalloc (sizeof (*p_sig)); | |
1952 | p_sig->prev = lwp->pending_signals; | |
1953 | p_sig->signal = lwp->resume->sig; | |
1954 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1955 | ||
1956 | /* If this is the same signal we were previously stopped by, | |
1957 | make sure to queue its siginfo. We can ignore the return | |
1958 | value of ptrace; if it fails, we'll skip | |
1959 | PTRACE_SETSIGINFO. */ | |
1960 | if (WIFSTOPPED (lwp->last_status) | |
1961 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
1962 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1963 | ||
1964 | lwp->pending_signals = p_sig; | |
1965 | } | |
1966 | } | |
5544ad89 | 1967 | |
bd99dc85 | 1968 | lwp->resume = NULL; |
5544ad89 | 1969 | return 0; |
0d62e5e8 DJ |
1970 | } |
1971 | ||
1972 | static void | |
2bd7c093 | 1973 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 1974 | { |
5544ad89 | 1975 | int pending_flag; |
2bd7c093 | 1976 | struct thread_resume_array array = { resume_info, n }; |
c6ecbae5 | 1977 | |
2bd7c093 | 1978 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 DJ |
1979 | |
1980 | /* If there is a thread which would otherwise be resumed, which | |
1981 | has a pending status, then don't resume any threads - we can just | |
1982 | report the pending status. Make sure to queue any signals | |
bd99dc85 PA |
1983 | that would otherwise be sent. In non-stop mode, we'll apply this |
1984 | logic to each thread individually. */ | |
5544ad89 | 1985 | pending_flag = 0; |
bd99dc85 PA |
1986 | if (!non_stop) |
1987 | find_inferior (&all_lwps, resume_status_pending_p, &pending_flag); | |
5544ad89 DJ |
1988 | |
1989 | if (debug_threads) | |
1990 | { | |
1991 | if (pending_flag) | |
1992 | fprintf (stderr, "Not resuming, pending status\n"); | |
1993 | else | |
1994 | fprintf (stderr, "Resuming, no pending status\n"); | |
1995 | } | |
1996 | ||
bd99dc85 | 1997 | find_inferior (&all_threads, linux_resume_one_thread, &pending_flag); |
0d62e5e8 DJ |
1998 | } |
1999 | ||
2000 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
2001 | |
2002 | int | |
0a30fbc4 | 2003 | register_addr (int regnum) |
da6d8c04 DJ |
2004 | { |
2005 | int addr; | |
2006 | ||
2ec06d2e | 2007 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
2008 | error ("Invalid register number %d.", regnum); |
2009 | ||
2ec06d2e | 2010 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2011 | |
2012 | return addr; | |
2013 | } | |
2014 | ||
58caa3dc | 2015 | /* Fetch one register. */ |
da6d8c04 DJ |
2016 | static void |
2017 | fetch_register (int regno) | |
2018 | { | |
2019 | CORE_ADDR regaddr; | |
48d93c75 | 2020 | int i, size; |
0d62e5e8 | 2021 | char *buf; |
95954743 | 2022 | int pid; |
da6d8c04 | 2023 | |
2ec06d2e | 2024 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2025 | return; |
2ec06d2e | 2026 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2027 | return; |
da6d8c04 | 2028 | |
0a30fbc4 DJ |
2029 | regaddr = register_addr (regno); |
2030 | if (regaddr == -1) | |
2031 | return; | |
95954743 PA |
2032 | |
2033 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2034 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2035 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2036 | buf = alloca (size); |
2037 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2038 | { |
2039 | errno = 0; | |
0d62e5e8 | 2040 | *(PTRACE_XFER_TYPE *) (buf + i) = |
95954743 | 2041 | ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
da6d8c04 DJ |
2042 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2043 | if (errno != 0) | |
2044 | { | |
2045 | /* Warning, not error, in case we are attached; sometimes the | |
2046 | kernel doesn't let us at the registers. */ | |
2047 | char *err = strerror (errno); | |
2048 | char *msg = alloca (strlen (err) + 128); | |
2049 | sprintf (msg, "reading register %d: %s", regno, err); | |
2050 | error (msg); | |
2051 | goto error_exit; | |
2052 | } | |
2053 | } | |
ee1a7ae4 UW |
2054 | |
2055 | if (the_low_target.supply_ptrace_register) | |
2056 | the_low_target.supply_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2057 | else |
2058 | supply_register (regno, buf); | |
0d62e5e8 | 2059 | |
da6d8c04 DJ |
2060 | error_exit:; |
2061 | } | |
2062 | ||
2063 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
2064 | static void |
2065 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 | 2066 | { |
4463ce24 | 2067 | if (regno == -1) |
2ec06d2e | 2068 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
2069 | fetch_register (regno); |
2070 | else | |
2071 | fetch_register (regno); | |
2072 | } | |
2073 | ||
2074 | /* Store our register values back into the inferior. | |
2075 | If REGNO is -1, do this for all registers. | |
2076 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
2077 | static void |
2078 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
2079 | { |
2080 | CORE_ADDR regaddr; | |
48d93c75 | 2081 | int i, size; |
0d62e5e8 | 2082 | char *buf; |
55ac2b99 | 2083 | int pid; |
da6d8c04 DJ |
2084 | |
2085 | if (regno >= 0) | |
2086 | { | |
2ec06d2e | 2087 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2088 | return; |
2089 | ||
bc1e36ca | 2090 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2091 | return; |
2092 | ||
2093 | regaddr = register_addr (regno); | |
2094 | if (regaddr == -1) | |
da6d8c04 | 2095 | return; |
da6d8c04 | 2096 | errno = 0; |
48d93c75 UW |
2097 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2098 | & - sizeof (PTRACE_XFER_TYPE); | |
2099 | buf = alloca (size); | |
2100 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2101 | |
2102 | if (the_low_target.collect_ptrace_register) | |
2103 | the_low_target.collect_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2104 | else |
2105 | collect_register (regno, buf); | |
ee1a7ae4 | 2106 | |
95954743 | 2107 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2108 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2109 | { |
0a30fbc4 | 2110 | errno = 0; |
95954743 | 2111 | ptrace (PTRACE_POKEUSER, pid, (PTRACE_ARG3_TYPE) regaddr, |
2ff29de4 | 2112 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
2113 | if (errno != 0) |
2114 | { | |
1b3f6016 PA |
2115 | /* At this point, ESRCH should mean the process is |
2116 | already gone, in which case we simply ignore attempts | |
2117 | to change its registers. See also the related | |
2118 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2119 | if (errno == ESRCH) |
2120 | return; | |
2121 | ||
bc1e36ca DJ |
2122 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
2123 | { | |
2124 | char *err = strerror (errno); | |
2125 | char *msg = alloca (strlen (err) + 128); | |
2126 | sprintf (msg, "writing register %d: %s", | |
2127 | regno, err); | |
2128 | error (msg); | |
2129 | return; | |
2130 | } | |
da6d8c04 | 2131 | } |
2ff29de4 | 2132 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2133 | } |
da6d8c04 DJ |
2134 | } |
2135 | else | |
2ec06d2e | 2136 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 2137 | usr_store_inferior_registers (regno); |
da6d8c04 | 2138 | } |
58caa3dc DJ |
2139 | #endif /* HAVE_LINUX_USRREGS */ |
2140 | ||
2141 | ||
2142 | ||
2143 | #ifdef HAVE_LINUX_REGSETS | |
2144 | ||
2145 | static int | |
0d62e5e8 | 2146 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
2147 | { |
2148 | struct regset_info *regset; | |
e9d25b98 | 2149 | int saw_general_regs = 0; |
95954743 | 2150 | int pid; |
58caa3dc DJ |
2151 | |
2152 | regset = target_regsets; | |
2153 | ||
95954743 | 2154 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2155 | while (regset->size >= 0) |
2156 | { | |
2157 | void *buf; | |
2158 | int res; | |
2159 | ||
52fa2412 | 2160 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2161 | { |
2162 | regset ++; | |
2163 | continue; | |
2164 | } | |
2165 | ||
bca929d3 | 2166 | buf = xmalloc (regset->size); |
dfb64f85 | 2167 | #ifndef __sparc__ |
95954743 | 2168 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2169 | #else |
95954743 | 2170 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2171 | #endif |
58caa3dc DJ |
2172 | if (res < 0) |
2173 | { | |
2174 | if (errno == EIO) | |
2175 | { | |
52fa2412 UW |
2176 | /* If we get EIO on a regset, do not try it again for |
2177 | this process. */ | |
2178 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2179 | free (buf); |
52fa2412 | 2180 | continue; |
58caa3dc DJ |
2181 | } |
2182 | else | |
2183 | { | |
0d62e5e8 | 2184 | char s[256]; |
95954743 PA |
2185 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
2186 | pid); | |
0d62e5e8 | 2187 | perror (s); |
58caa3dc DJ |
2188 | } |
2189 | } | |
e9d25b98 DJ |
2190 | else if (regset->type == GENERAL_REGS) |
2191 | saw_general_regs = 1; | |
58caa3dc DJ |
2192 | regset->store_function (buf); |
2193 | regset ++; | |
fdeb2a12 | 2194 | free (buf); |
58caa3dc | 2195 | } |
e9d25b98 DJ |
2196 | if (saw_general_regs) |
2197 | return 0; | |
2198 | else | |
2199 | return 1; | |
58caa3dc DJ |
2200 | } |
2201 | ||
2202 | static int | |
0d62e5e8 | 2203 | regsets_store_inferior_registers () |
58caa3dc DJ |
2204 | { |
2205 | struct regset_info *regset; | |
e9d25b98 | 2206 | int saw_general_regs = 0; |
95954743 | 2207 | int pid; |
58caa3dc DJ |
2208 | |
2209 | regset = target_regsets; | |
2210 | ||
95954743 | 2211 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2212 | while (regset->size >= 0) |
2213 | { | |
2214 | void *buf; | |
2215 | int res; | |
2216 | ||
52fa2412 | 2217 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2218 | { |
2219 | regset ++; | |
2220 | continue; | |
2221 | } | |
2222 | ||
bca929d3 | 2223 | buf = xmalloc (regset->size); |
545587ee DJ |
2224 | |
2225 | /* First fill the buffer with the current register set contents, | |
2226 | in case there are any items in the kernel's regset that are | |
2227 | not in gdbserver's regcache. */ | |
dfb64f85 | 2228 | #ifndef __sparc__ |
95954743 | 2229 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2230 | #else |
95954743 | 2231 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2232 | #endif |
545587ee DJ |
2233 | |
2234 | if (res == 0) | |
2235 | { | |
2236 | /* Then overlay our cached registers on that. */ | |
2237 | regset->fill_function (buf); | |
2238 | ||
2239 | /* Only now do we write the register set. */ | |
dfb64f85 | 2240 | #ifndef __sparc__ |
95954743 | 2241 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 2242 | #else |
95954743 | 2243 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 2244 | #endif |
545587ee DJ |
2245 | } |
2246 | ||
58caa3dc DJ |
2247 | if (res < 0) |
2248 | { | |
2249 | if (errno == EIO) | |
2250 | { | |
52fa2412 UW |
2251 | /* If we get EIO on a regset, do not try it again for |
2252 | this process. */ | |
2253 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2254 | free (buf); |
52fa2412 | 2255 | continue; |
58caa3dc | 2256 | } |
3221518c UW |
2257 | else if (errno == ESRCH) |
2258 | { | |
1b3f6016 PA |
2259 | /* At this point, ESRCH should mean the process is |
2260 | already gone, in which case we simply ignore attempts | |
2261 | to change its registers. See also the related | |
2262 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 2263 | free (buf); |
3221518c UW |
2264 | return 0; |
2265 | } | |
58caa3dc DJ |
2266 | else |
2267 | { | |
ce3a066d | 2268 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
2269 | } |
2270 | } | |
e9d25b98 DJ |
2271 | else if (regset->type == GENERAL_REGS) |
2272 | saw_general_regs = 1; | |
58caa3dc | 2273 | regset ++; |
09ec9b38 | 2274 | free (buf); |
58caa3dc | 2275 | } |
e9d25b98 DJ |
2276 | if (saw_general_regs) |
2277 | return 0; | |
2278 | else | |
2279 | return 1; | |
ce3a066d | 2280 | return 0; |
58caa3dc DJ |
2281 | } |
2282 | ||
2283 | #endif /* HAVE_LINUX_REGSETS */ | |
2284 | ||
2285 | ||
2286 | void | |
ce3a066d | 2287 | linux_fetch_registers (int regno) |
58caa3dc DJ |
2288 | { |
2289 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2290 | if (regsets_fetch_inferior_registers () == 0) |
2291 | return; | |
58caa3dc DJ |
2292 | #endif |
2293 | #ifdef HAVE_LINUX_USRREGS | |
2294 | usr_fetch_inferior_registers (regno); | |
2295 | #endif | |
2296 | } | |
2297 | ||
2298 | void | |
ce3a066d | 2299 | linux_store_registers (int regno) |
58caa3dc DJ |
2300 | { |
2301 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2302 | if (regsets_store_inferior_registers () == 0) |
2303 | return; | |
58caa3dc DJ |
2304 | #endif |
2305 | #ifdef HAVE_LINUX_USRREGS | |
2306 | usr_store_inferior_registers (regno); | |
2307 | #endif | |
2308 | } | |
2309 | ||
da6d8c04 | 2310 | |
da6d8c04 DJ |
2311 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
2312 | to debugger memory starting at MYADDR. */ | |
2313 | ||
c3e735a6 | 2314 | static int |
f450004a | 2315 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
2316 | { |
2317 | register int i; | |
2318 | /* Round starting address down to longword boundary. */ | |
2319 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2320 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
2321 | register int count |
2322 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
2323 | / sizeof (PTRACE_XFER_TYPE); |
2324 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 2325 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 2326 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
2327 | int fd; |
2328 | char filename[64]; | |
95954743 | 2329 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
2330 | |
2331 | /* Try using /proc. Don't bother for one word. */ | |
2332 | if (len >= 3 * sizeof (long)) | |
2333 | { | |
2334 | /* We could keep this file open and cache it - possibly one per | |
2335 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 2336 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
2337 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
2338 | if (fd == -1) | |
2339 | goto no_proc; | |
2340 | ||
2341 | /* If pread64 is available, use it. It's faster if the kernel | |
2342 | supports it (only one syscall), and it's 64-bit safe even on | |
2343 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
2344 | application). */ | |
2345 | #ifdef HAVE_PREAD64 | |
2346 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
2347 | #else | |
2348 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len) | |
2349 | #endif | |
2350 | { | |
2351 | close (fd); | |
2352 | goto no_proc; | |
2353 | } | |
2354 | ||
2355 | close (fd); | |
2356 | return 0; | |
2357 | } | |
da6d8c04 | 2358 | |
fd462a61 | 2359 | no_proc: |
da6d8c04 DJ |
2360 | /* Read all the longwords */ |
2361 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2362 | { | |
c3e735a6 | 2363 | errno = 0; |
95954743 | 2364 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
c3e735a6 DJ |
2365 | if (errno) |
2366 | return errno; | |
da6d8c04 DJ |
2367 | } |
2368 | ||
2369 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
2370 | memcpy (myaddr, |
2371 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
2372 | len); | |
c3e735a6 DJ |
2373 | |
2374 | return 0; | |
da6d8c04 DJ |
2375 | } |
2376 | ||
2377 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
2378 | to inferior's memory at MEMADDR. | |
2379 | On failure (cannot write the inferior) | |
2380 | returns the value of errno. */ | |
2381 | ||
ce3a066d | 2382 | static int |
f450004a | 2383 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
2384 | { |
2385 | register int i; | |
2386 | /* Round starting address down to longword boundary. */ | |
2387 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2388 | /* Round ending address up; get number of longwords that makes. */ | |
2389 | register int count | |
2390 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
2391 | /* Allocate buffer of that many longwords. */ | |
2392 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 2393 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 2394 | |
0d62e5e8 DJ |
2395 | if (debug_threads) |
2396 | { | |
58d6951d DJ |
2397 | /* Dump up to four bytes. */ |
2398 | unsigned int val = * (unsigned int *) myaddr; | |
2399 | if (len == 1) | |
2400 | val = val & 0xff; | |
2401 | else if (len == 2) | |
2402 | val = val & 0xffff; | |
2403 | else if (len == 3) | |
2404 | val = val & 0xffffff; | |
2405 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
2406 | val, (long)memaddr); | |
0d62e5e8 DJ |
2407 | } |
2408 | ||
da6d8c04 DJ |
2409 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
2410 | ||
95954743 | 2411 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
da6d8c04 DJ |
2412 | |
2413 | if (count > 1) | |
2414 | { | |
2415 | buffer[count - 1] | |
95954743 | 2416 | = ptrace (PTRACE_PEEKTEXT, pid, |
d844cde6 DJ |
2417 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
2418 | * sizeof (PTRACE_XFER_TYPE)), | |
2419 | 0); | |
da6d8c04 DJ |
2420 | } |
2421 | ||
2422 | /* Copy data to be written over corresponding part of buffer */ | |
2423 | ||
2424 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
2425 | ||
2426 | /* Write the entire buffer. */ | |
2427 | ||
2428 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2429 | { | |
2430 | errno = 0; | |
95954743 | 2431 | ptrace (PTRACE_POKETEXT, pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
2432 | if (errno) |
2433 | return errno; | |
2434 | } | |
2435 | ||
2436 | return 0; | |
2437 | } | |
2f2893d9 | 2438 | |
24a09b5f DJ |
2439 | static int linux_supports_tracefork_flag; |
2440 | ||
51c2684e | 2441 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 2442 | |
51c2684e DJ |
2443 | static int |
2444 | linux_tracefork_grandchild (void *arg) | |
2445 | { | |
2446 | _exit (0); | |
2447 | } | |
2448 | ||
7407e2de AS |
2449 | #define STACK_SIZE 4096 |
2450 | ||
51c2684e DJ |
2451 | static int |
2452 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
2453 | { |
2454 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
2455 | kill (getpid (), SIGSTOP); | |
7407e2de AS |
2456 | #ifdef __ia64__ |
2457 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
2458 | CLONE_VM | SIGCHLD, NULL); | |
2459 | #else | |
2460 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
2461 | CLONE_VM | SIGCHLD, NULL); | |
2462 | #endif | |
24a09b5f DJ |
2463 | _exit (0); |
2464 | } | |
2465 | ||
bd99dc85 PA |
2466 | /* Wrapper function for waitpid which handles EINTR, and emulates |
2467 | __WALL for systems where that is not available. */ | |
24a09b5f DJ |
2468 | |
2469 | static int | |
2470 | my_waitpid (int pid, int *status, int flags) | |
2471 | { | |
bd99dc85 PA |
2472 | int ret, out_errno; |
2473 | ||
2474 | if (debug_threads) | |
2475 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
2476 | ||
2477 | if (flags & __WALL) | |
24a09b5f | 2478 | { |
bd99dc85 PA |
2479 | sigset_t block_mask, org_mask, wake_mask; |
2480 | int wnohang; | |
2481 | ||
2482 | wnohang = (flags & WNOHANG) != 0; | |
2483 | flags &= ~(__WALL | __WCLONE); | |
2484 | flags |= WNOHANG; | |
2485 | ||
2486 | /* Block all signals while here. This avoids knowing about | |
2487 | LinuxThread's signals. */ | |
2488 | sigfillset (&block_mask); | |
2489 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
2490 | ||
2491 | /* ... except during the sigsuspend below. */ | |
2492 | sigemptyset (&wake_mask); | |
2493 | ||
2494 | while (1) | |
2495 | { | |
2496 | /* Since all signals are blocked, there's no need to check | |
2497 | for EINTR here. */ | |
2498 | ret = waitpid (pid, status, flags); | |
2499 | out_errno = errno; | |
2500 | ||
2501 | if (ret == -1 && out_errno != ECHILD) | |
2502 | break; | |
2503 | else if (ret > 0) | |
2504 | break; | |
2505 | ||
2506 | if (flags & __WCLONE) | |
2507 | { | |
2508 | /* We've tried both flavors now. If WNOHANG is set, | |
2509 | there's nothing else to do, just bail out. */ | |
2510 | if (wnohang) | |
2511 | break; | |
2512 | ||
2513 | if (debug_threads) | |
2514 | fprintf (stderr, "blocking\n"); | |
2515 | ||
2516 | /* Block waiting for signals. */ | |
2517 | sigsuspend (&wake_mask); | |
2518 | } | |
2519 | ||
2520 | flags ^= __WCLONE; | |
2521 | } | |
2522 | ||
2523 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
24a09b5f | 2524 | } |
bd99dc85 PA |
2525 | else |
2526 | { | |
2527 | do | |
2528 | ret = waitpid (pid, status, flags); | |
2529 | while (ret == -1 && errno == EINTR); | |
2530 | out_errno = errno; | |
2531 | } | |
2532 | ||
2533 | if (debug_threads) | |
2534 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
2535 | pid, flags, status ? *status : -1, ret); | |
24a09b5f | 2536 | |
bd99dc85 | 2537 | errno = out_errno; |
24a09b5f DJ |
2538 | return ret; |
2539 | } | |
2540 | ||
2541 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make | |
2542 | sure that we can enable the option, and that it had the desired | |
2543 | effect. */ | |
2544 | ||
2545 | static void | |
2546 | linux_test_for_tracefork (void) | |
2547 | { | |
2548 | int child_pid, ret, status; | |
2549 | long second_pid; | |
bca929d3 | 2550 | char *stack = xmalloc (STACK_SIZE * 4); |
24a09b5f DJ |
2551 | |
2552 | linux_supports_tracefork_flag = 0; | |
2553 | ||
51c2684e | 2554 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
2555 | #ifdef __ia64__ |
2556 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
2557 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2558 | #else | |
2559 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, | |
2560 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2561 | #endif | |
24a09b5f | 2562 | if (child_pid == -1) |
51c2684e | 2563 | perror_with_name ("clone"); |
24a09b5f DJ |
2564 | |
2565 | ret = my_waitpid (child_pid, &status, 0); | |
2566 | if (ret == -1) | |
2567 | perror_with_name ("waitpid"); | |
2568 | else if (ret != child_pid) | |
2569 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
2570 | if (! WIFSTOPPED (status)) | |
2571 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
2572 | ||
2573 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); | |
2574 | if (ret != 0) | |
2575 | { | |
2576 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2577 | if (ret != 0) | |
2578 | { | |
2579 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2580 | return; | |
2581 | } | |
2582 | ||
2583 | ret = my_waitpid (child_pid, &status, 0); | |
2584 | if (ret != child_pid) | |
2585 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
2586 | else if (!WIFSIGNALED (status)) | |
2587 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
2588 | "killed child", status); | |
2589 | ||
2590 | return; | |
2591 | } | |
2592 | ||
2593 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
2594 | if (ret != 0) | |
2595 | warning ("linux_test_for_tracefork: failed to resume child"); | |
2596 | ||
2597 | ret = my_waitpid (child_pid, &status, 0); | |
2598 | ||
2599 | if (ret == child_pid && WIFSTOPPED (status) | |
2600 | && status >> 16 == PTRACE_EVENT_FORK) | |
2601 | { | |
2602 | second_pid = 0; | |
2603 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
2604 | if (ret == 0 && second_pid != 0) | |
2605 | { | |
2606 | int second_status; | |
2607 | ||
2608 | linux_supports_tracefork_flag = 1; | |
2609 | my_waitpid (second_pid, &second_status, 0); | |
2610 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
2611 | if (ret != 0) | |
2612 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
2613 | my_waitpid (second_pid, &status, 0); | |
2614 | } | |
2615 | } | |
2616 | else | |
2617 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
2618 | "(%d, status 0x%x)", ret, status); | |
2619 | ||
2620 | do | |
2621 | { | |
2622 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2623 | if (ret != 0) | |
2624 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2625 | my_waitpid (child_pid, &status, 0); | |
2626 | } | |
2627 | while (WIFSTOPPED (status)); | |
51c2684e DJ |
2628 | |
2629 | free (stack); | |
24a09b5f DJ |
2630 | } |
2631 | ||
2632 | ||
2f2893d9 DJ |
2633 | static void |
2634 | linux_look_up_symbols (void) | |
2635 | { | |
0d62e5e8 | 2636 | #ifdef USE_THREAD_DB |
95954743 PA |
2637 | struct process_info *proc = current_process (); |
2638 | ||
2639 | if (proc->private->thread_db_active) | |
0d62e5e8 DJ |
2640 | return; |
2641 | ||
95954743 PA |
2642 | proc->private->thread_db_active |
2643 | = thread_db_init (!linux_supports_tracefork_flag); | |
0d62e5e8 DJ |
2644 | #endif |
2645 | } | |
2646 | ||
e5379b03 | 2647 | static void |
ef57601b | 2648 | linux_request_interrupt (void) |
e5379b03 | 2649 | { |
a1928bad | 2650 | extern unsigned long signal_pid; |
e5379b03 | 2651 | |
95954743 PA |
2652 | if (!ptid_equal (cont_thread, null_ptid) |
2653 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 2654 | { |
54a0b537 | 2655 | struct lwp_info *lwp; |
bd99dc85 | 2656 | int lwpid; |
e5379b03 | 2657 | |
54a0b537 | 2658 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
2659 | lwpid = lwpid_of (lwp); |
2660 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
2661 | } |
2662 | else | |
ef57601b | 2663 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
2664 | } |
2665 | ||
aa691b87 RM |
2666 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
2667 | to debugger memory starting at MYADDR. */ | |
2668 | ||
2669 | static int | |
f450004a | 2670 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
2671 | { |
2672 | char filename[PATH_MAX]; | |
2673 | int fd, n; | |
95954743 | 2674 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 2675 | |
95954743 | 2676 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
2677 | |
2678 | fd = open (filename, O_RDONLY); | |
2679 | if (fd < 0) | |
2680 | return -1; | |
2681 | ||
2682 | if (offset != (CORE_ADDR) 0 | |
2683 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
2684 | n = -1; | |
2685 | else | |
2686 | n = read (fd, myaddr, len); | |
2687 | ||
2688 | close (fd); | |
2689 | ||
2690 | return n; | |
2691 | } | |
2692 | ||
d993e290 PA |
2693 | /* These breakpoint and watchpoint related wrapper functions simply |
2694 | pass on the function call if the target has registered a | |
2695 | corresponding function. */ | |
e013ee27 OF |
2696 | |
2697 | static int | |
d993e290 | 2698 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2699 | { |
d993e290 PA |
2700 | if (the_low_target.insert_point != NULL) |
2701 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
2702 | else |
2703 | /* Unsupported (see target.h). */ | |
2704 | return 1; | |
2705 | } | |
2706 | ||
2707 | static int | |
d993e290 | 2708 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 2709 | { |
d993e290 PA |
2710 | if (the_low_target.remove_point != NULL) |
2711 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
2712 | else |
2713 | /* Unsupported (see target.h). */ | |
2714 | return 1; | |
2715 | } | |
2716 | ||
2717 | static int | |
2718 | linux_stopped_by_watchpoint (void) | |
2719 | { | |
2720 | if (the_low_target.stopped_by_watchpoint != NULL) | |
2721 | return the_low_target.stopped_by_watchpoint (); | |
2722 | else | |
2723 | return 0; | |
2724 | } | |
2725 | ||
2726 | static CORE_ADDR | |
2727 | linux_stopped_data_address (void) | |
2728 | { | |
2729 | if (the_low_target.stopped_data_address != NULL) | |
2730 | return the_low_target.stopped_data_address (); | |
2731 | else | |
2732 | return 0; | |
2733 | } | |
2734 | ||
42c81e2a | 2735 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
2736 | #if defined(__mcoldfire__) |
2737 | /* These should really be defined in the kernel's ptrace.h header. */ | |
2738 | #define PT_TEXT_ADDR 49*4 | |
2739 | #define PT_DATA_ADDR 50*4 | |
2740 | #define PT_TEXT_END_ADDR 51*4 | |
2741 | #endif | |
2742 | ||
2743 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
2744 | to tell gdb about. */ | |
2745 | ||
2746 | static int | |
2747 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
2748 | { | |
2749 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
2750 | unsigned long text, text_end, data; | |
bd99dc85 | 2751 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
2752 | |
2753 | errno = 0; | |
2754 | ||
2755 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
2756 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
2757 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
2758 | ||
2759 | if (errno == 0) | |
2760 | { | |
2761 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
2762 | used by gdb) are relative to the beginning of the program, |
2763 | with the data segment immediately following the text segment. | |
2764 | However, the actual runtime layout in memory may put the data | |
2765 | somewhere else, so when we send gdb a data base-address, we | |
2766 | use the real data base address and subtract the compile-time | |
2767 | data base-address from it (which is just the length of the | |
2768 | text segment). BSS immediately follows data in both | |
2769 | cases. */ | |
52fb6437 NS |
2770 | *text_p = text; |
2771 | *data_p = data - (text_end - text); | |
1b3f6016 | 2772 | |
52fb6437 NS |
2773 | return 1; |
2774 | } | |
2775 | #endif | |
2776 | return 0; | |
2777 | } | |
2778 | #endif | |
2779 | ||
07e059b5 VP |
2780 | static int |
2781 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
2782 | unsigned char *readbuf, unsigned const char *writebuf, |
2783 | CORE_ADDR offset, int len) | |
07e059b5 VP |
2784 | { |
2785 | /* We make the process list snapshot when the object starts to be | |
2786 | read. */ | |
2787 | static const char *buf; | |
2788 | static long len_avail = -1; | |
2789 | static struct buffer buffer; | |
2790 | ||
2791 | DIR *dirp; | |
2792 | ||
2793 | if (strcmp (annex, "processes") != 0) | |
2794 | return 0; | |
2795 | ||
2796 | if (!readbuf || writebuf) | |
2797 | return 0; | |
2798 | ||
2799 | if (offset == 0) | |
2800 | { | |
2801 | if (len_avail != -1 && len_avail != 0) | |
2802 | buffer_free (&buffer); | |
2803 | len_avail = 0; | |
2804 | buf = NULL; | |
2805 | buffer_init (&buffer); | |
2806 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
2807 | ||
2808 | dirp = opendir ("/proc"); | |
2809 | if (dirp) | |
2810 | { | |
1b3f6016 PA |
2811 | struct dirent *dp; |
2812 | while ((dp = readdir (dirp)) != NULL) | |
2813 | { | |
2814 | struct stat statbuf; | |
2815 | char procentry[sizeof ("/proc/4294967295")]; | |
2816 | ||
2817 | if (!isdigit (dp->d_name[0]) | |
2818 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
2819 | continue; | |
2820 | ||
2821 | sprintf (procentry, "/proc/%s", dp->d_name); | |
2822 | if (stat (procentry, &statbuf) == 0 | |
2823 | && S_ISDIR (statbuf.st_mode)) | |
2824 | { | |
2825 | char pathname[128]; | |
2826 | FILE *f; | |
2827 | char cmd[MAXPATHLEN + 1]; | |
2828 | struct passwd *entry; | |
2829 | ||
2830 | sprintf (pathname, "/proc/%s/cmdline", dp->d_name); | |
2831 | entry = getpwuid (statbuf.st_uid); | |
2832 | ||
2833 | if ((f = fopen (pathname, "r")) != NULL) | |
2834 | { | |
2835 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
2836 | if (len > 0) | |
2837 | { | |
2838 | int i; | |
2839 | for (i = 0; i < len; i++) | |
2840 | if (cmd[i] == '\0') | |
2841 | cmd[i] = ' '; | |
2842 | cmd[len] = '\0'; | |
2843 | ||
2844 | buffer_xml_printf ( | |
07e059b5 VP |
2845 | &buffer, |
2846 | "<item>" | |
2847 | "<column name=\"pid\">%s</column>" | |
2848 | "<column name=\"user\">%s</column>" | |
2849 | "<column name=\"command\">%s</column>" | |
2850 | "</item>", | |
2851 | dp->d_name, | |
2852 | entry ? entry->pw_name : "?", | |
2853 | cmd); | |
1b3f6016 PA |
2854 | } |
2855 | fclose (f); | |
2856 | } | |
2857 | } | |
2858 | } | |
07e059b5 | 2859 | |
1b3f6016 | 2860 | closedir (dirp); |
07e059b5 VP |
2861 | } |
2862 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
2863 | buf = buffer_finish (&buffer); | |
2864 | len_avail = strlen (buf); | |
2865 | } | |
2866 | ||
2867 | if (offset >= len_avail) | |
2868 | { | |
2869 | /* Done. Get rid of the data. */ | |
2870 | buffer_free (&buffer); | |
2871 | buf = NULL; | |
2872 | len_avail = 0; | |
2873 | return 0; | |
2874 | } | |
2875 | ||
2876 | if (len > len_avail - offset) | |
2877 | len = len_avail - offset; | |
2878 | memcpy (readbuf, buf + offset, len); | |
2879 | ||
2880 | return len; | |
2881 | } | |
2882 | ||
d0722149 DE |
2883 | /* Convert a native/host siginfo object, into/from the siginfo in the |
2884 | layout of the inferiors' architecture. */ | |
2885 | ||
2886 | static void | |
2887 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
2888 | { | |
2889 | int done = 0; | |
2890 | ||
2891 | if (the_low_target.siginfo_fixup != NULL) | |
2892 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
2893 | ||
2894 | /* If there was no callback, or the callback didn't do anything, | |
2895 | then just do a straight memcpy. */ | |
2896 | if (!done) | |
2897 | { | |
2898 | if (direction == 1) | |
2899 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
2900 | else | |
2901 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
2902 | } | |
2903 | } | |
2904 | ||
4aa995e1 PA |
2905 | static int |
2906 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
2907 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
2908 | { | |
d0722149 | 2909 | int pid; |
4aa995e1 | 2910 | struct siginfo siginfo; |
d0722149 | 2911 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
2912 | |
2913 | if (current_inferior == NULL) | |
2914 | return -1; | |
2915 | ||
bd99dc85 | 2916 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
2917 | |
2918 | if (debug_threads) | |
d0722149 | 2919 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
2920 | readbuf != NULL ? "Reading" : "Writing", |
2921 | pid); | |
2922 | ||
2923 | if (offset > sizeof (siginfo)) | |
2924 | return -1; | |
2925 | ||
2926 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
2927 | return -1; | |
2928 | ||
d0722149 DE |
2929 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
2930 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
2931 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
2932 | with a 32-bit GDBSERVER, we need to convert it. */ | |
2933 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
2934 | ||
4aa995e1 PA |
2935 | if (offset + len > sizeof (siginfo)) |
2936 | len = sizeof (siginfo) - offset; | |
2937 | ||
2938 | if (readbuf != NULL) | |
d0722149 | 2939 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
2940 | else |
2941 | { | |
d0722149 DE |
2942 | memcpy (inf_siginfo + offset, writebuf, len); |
2943 | ||
2944 | /* Convert back to ptrace layout before flushing it out. */ | |
2945 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
2946 | ||
4aa995e1 PA |
2947 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
2948 | return -1; | |
2949 | } | |
2950 | ||
2951 | return len; | |
2952 | } | |
2953 | ||
bd99dc85 PA |
2954 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
2955 | so we notice when children change state; as the handler for the | |
2956 | sigsuspend in my_waitpid. */ | |
2957 | ||
2958 | static void | |
2959 | sigchld_handler (int signo) | |
2960 | { | |
2961 | int old_errno = errno; | |
2962 | ||
2963 | if (debug_threads) | |
2964 | /* fprintf is not async-signal-safe, so call write directly. */ | |
2965 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
2966 | ||
2967 | if (target_is_async_p ()) | |
2968 | async_file_mark (); /* trigger a linux_wait */ | |
2969 | ||
2970 | errno = old_errno; | |
2971 | } | |
2972 | ||
2973 | static int | |
2974 | linux_supports_non_stop (void) | |
2975 | { | |
2976 | return 1; | |
2977 | } | |
2978 | ||
2979 | static int | |
2980 | linux_async (int enable) | |
2981 | { | |
2982 | int previous = (linux_event_pipe[0] != -1); | |
2983 | ||
2984 | if (previous != enable) | |
2985 | { | |
2986 | sigset_t mask; | |
2987 | sigemptyset (&mask); | |
2988 | sigaddset (&mask, SIGCHLD); | |
2989 | ||
2990 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
2991 | ||
2992 | if (enable) | |
2993 | { | |
2994 | if (pipe (linux_event_pipe) == -1) | |
2995 | fatal ("creating event pipe failed."); | |
2996 | ||
2997 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
2998 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
2999 | ||
3000 | /* Register the event loop handler. */ | |
3001 | add_file_handler (linux_event_pipe[0], | |
3002 | handle_target_event, NULL); | |
3003 | ||
3004 | /* Always trigger a linux_wait. */ | |
3005 | async_file_mark (); | |
3006 | } | |
3007 | else | |
3008 | { | |
3009 | delete_file_handler (linux_event_pipe[0]); | |
3010 | ||
3011 | close (linux_event_pipe[0]); | |
3012 | close (linux_event_pipe[1]); | |
3013 | linux_event_pipe[0] = -1; | |
3014 | linux_event_pipe[1] = -1; | |
3015 | } | |
3016 | ||
3017 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
3018 | } | |
3019 | ||
3020 | return previous; | |
3021 | } | |
3022 | ||
3023 | static int | |
3024 | linux_start_non_stop (int nonstop) | |
3025 | { | |
3026 | /* Register or unregister from event-loop accordingly. */ | |
3027 | linux_async (nonstop); | |
3028 | return 0; | |
3029 | } | |
3030 | ||
cf8fd78b PA |
3031 | static int |
3032 | linux_supports_multi_process (void) | |
3033 | { | |
3034 | return 1; | |
3035 | } | |
3036 | ||
ce3a066d DJ |
3037 | static struct target_ops linux_target_ops = { |
3038 | linux_create_inferior, | |
3039 | linux_attach, | |
3040 | linux_kill, | |
6ad8ae5c | 3041 | linux_detach, |
444d6139 | 3042 | linux_join, |
ce3a066d DJ |
3043 | linux_thread_alive, |
3044 | linux_resume, | |
3045 | linux_wait, | |
3046 | linux_fetch_registers, | |
3047 | linux_store_registers, | |
3048 | linux_read_memory, | |
3049 | linux_write_memory, | |
2f2893d9 | 3050 | linux_look_up_symbols, |
ef57601b | 3051 | linux_request_interrupt, |
aa691b87 | 3052 | linux_read_auxv, |
d993e290 PA |
3053 | linux_insert_point, |
3054 | linux_remove_point, | |
e013ee27 OF |
3055 | linux_stopped_by_watchpoint, |
3056 | linux_stopped_data_address, | |
42c81e2a | 3057 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 3058 | linux_read_offsets, |
dae5f5cf DJ |
3059 | #else |
3060 | NULL, | |
3061 | #endif | |
3062 | #ifdef USE_THREAD_DB | |
3063 | thread_db_get_tls_address, | |
3064 | #else | |
3065 | NULL, | |
52fb6437 | 3066 | #endif |
59a016f0 PA |
3067 | NULL, |
3068 | hostio_last_error_from_errno, | |
07e059b5 | 3069 | linux_qxfer_osdata, |
4aa995e1 | 3070 | linux_xfer_siginfo, |
bd99dc85 PA |
3071 | linux_supports_non_stop, |
3072 | linux_async, | |
3073 | linux_start_non_stop, | |
cf8fd78b | 3074 | linux_supports_multi_process |
ce3a066d DJ |
3075 | }; |
3076 | ||
0d62e5e8 DJ |
3077 | static void |
3078 | linux_init_signals () | |
3079 | { | |
3080 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
3081 | to find what the cancel signal actually is. */ | |
254787d4 | 3082 | signal (__SIGRTMIN+1, SIG_IGN); |
0d62e5e8 DJ |
3083 | } |
3084 | ||
da6d8c04 DJ |
3085 | void |
3086 | initialize_low (void) | |
3087 | { | |
bd99dc85 PA |
3088 | struct sigaction sigchld_action; |
3089 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 3090 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
3091 | set_breakpoint_data (the_low_target.breakpoint, |
3092 | the_low_target.breakpoint_len); | |
0d62e5e8 | 3093 | linux_init_signals (); |
24a09b5f | 3094 | linux_test_for_tracefork (); |
52fa2412 UW |
3095 | #ifdef HAVE_LINUX_REGSETS |
3096 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
3097 | ; | |
bca929d3 | 3098 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 3099 | #endif |
bd99dc85 PA |
3100 | |
3101 | sigchld_action.sa_handler = sigchld_handler; | |
3102 | sigemptyset (&sigchld_action.sa_mask); | |
3103 | sigchld_action.sa_flags = SA_RESTART; | |
3104 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 3105 | } |