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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); | |
227 | free (lwp); | |
228 | } | |
229 | ||
95954743 PA |
230 | /* Add a process to the common process list, and set its private |
231 | data. */ | |
232 | ||
233 | static struct process_info * | |
234 | linux_add_process (int pid, int attached) | |
235 | { | |
236 | struct process_info *proc; | |
237 | ||
238 | /* Is this the first process? If so, then set the arch. */ | |
239 | if (all_processes.head == NULL) | |
240 | new_inferior = 1; | |
241 | ||
242 | proc = add_process (pid, attached); | |
243 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
244 | ||
245 | return proc; | |
246 | } | |
247 | ||
5091eb23 DE |
248 | /* Remove a process from the common process list, |
249 | also freeing all private data. */ | |
250 | ||
251 | static void | |
252 | linux_remove_process (struct process_info *process) | |
253 | { | |
254 | free (process->private); | |
255 | remove_process (process); | |
256 | } | |
257 | ||
bd99dc85 PA |
258 | /* Handle a GNU/Linux extended wait response. If we see a clone |
259 | event, we need to add the new LWP to our list (and not report the | |
260 | trap to higher layers). */ | |
0d62e5e8 | 261 | |
24a09b5f | 262 | static void |
54a0b537 | 263 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
264 | { |
265 | int event = wstat >> 16; | |
54a0b537 | 266 | struct lwp_info *new_lwp; |
24a09b5f DJ |
267 | |
268 | if (event == PTRACE_EVENT_CLONE) | |
269 | { | |
95954743 | 270 | ptid_t ptid; |
24a09b5f | 271 | unsigned long new_pid; |
836acd6d | 272 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 273 | |
bd99dc85 | 274 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
275 | |
276 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
277 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
278 | { | |
279 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
280 | hits the SIGSTOP, but we're already attached. */ | |
281 | ||
97438e3f | 282 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
283 | |
284 | if (ret == -1) | |
285 | perror_with_name ("waiting for new child"); | |
286 | else if (ret != new_pid) | |
287 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 288 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
289 | warning ("wait returned unexpected status 0x%x", status); |
290 | } | |
291 | ||
292 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE); | |
293 | ||
95954743 PA |
294 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
295 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
296 | add_thread (ptid, new_lwp); | |
24a09b5f | 297 | |
e27d73f6 DE |
298 | /* Either we're going to immediately resume the new thread |
299 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
300 | thinks the thread is currently running, so set this first | |
301 | before calling linux_resume_one_lwp. */ | |
302 | new_lwp->stopped = 1; | |
303 | ||
da5898ce DJ |
304 | /* Normally we will get the pending SIGSTOP. But in some cases |
305 | we might get another signal delivered to the group first. | |
f21cc1a2 | 306 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
307 | if (WSTOPSIG (status) == SIGSTOP) |
308 | { | |
e27d73f6 DE |
309 | if (! stopping_threads) |
310 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); | |
da5898ce | 311 | } |
24a09b5f | 312 | else |
da5898ce | 313 | { |
54a0b537 | 314 | new_lwp->stop_expected = 1; |
da5898ce DJ |
315 | if (stopping_threads) |
316 | { | |
54a0b537 PA |
317 | new_lwp->status_pending_p = 1; |
318 | new_lwp->status_pending = status; | |
da5898ce DJ |
319 | } |
320 | else | |
321 | /* Pass the signal on. This is what GDB does - except | |
322 | shouldn't we really report it instead? */ | |
e27d73f6 | 323 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 324 | } |
24a09b5f DJ |
325 | |
326 | /* Always resume the current thread. If we are stopping | |
327 | threads, it will have a pending SIGSTOP; we may as well | |
328 | collect it now. */ | |
2acc282a | 329 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
330 | } |
331 | } | |
332 | ||
0d62e5e8 DJ |
333 | /* This function should only be called if the process got a SIGTRAP. |
334 | The SIGTRAP could mean several things. | |
335 | ||
336 | On i386, where decr_pc_after_break is non-zero: | |
337 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
338 | we will get only the one SIGTRAP (even if the instruction we | |
339 | stepped over was a breakpoint). The value of $eip will be the | |
340 | next instruction. | |
341 | If we continue the process using PTRACE_CONT, we will get a | |
342 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
343 | the instruction after the breakpoint (i.e. needs to be | |
344 | decremented). If we report the SIGTRAP to GDB, we must also | |
345 | report the undecremented PC. If we cancel the SIGTRAP, we | |
346 | must resume at the decremented PC. | |
347 | ||
348 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
349 | with hardware or kernel single-step: | |
350 | If we single-step over a breakpoint instruction, our PC will | |
351 | point at the following instruction. If we continue and hit a | |
352 | breakpoint instruction, our PC will point at the breakpoint | |
353 | instruction. */ | |
354 | ||
355 | static CORE_ADDR | |
356 | get_stop_pc (void) | |
357 | { | |
358 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
359 | ||
47c0c975 DE |
360 | if (! get_thread_lwp (current_inferior)->stepping) |
361 | stop_pc -= the_low_target.decr_pc_after_break; | |
362 | ||
363 | if (debug_threads) | |
364 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
365 | ||
366 | return stop_pc; | |
0d62e5e8 | 367 | } |
ce3a066d | 368 | |
0d62e5e8 | 369 | static void * |
95954743 | 370 | add_lwp (ptid_t ptid) |
611cb4a5 | 371 | { |
54a0b537 | 372 | struct lwp_info *lwp; |
0d62e5e8 | 373 | |
54a0b537 PA |
374 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
375 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 376 | |
95954743 | 377 | lwp->head.id = ptid; |
0d62e5e8 | 378 | |
54a0b537 | 379 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 380 | |
54a0b537 | 381 | return lwp; |
0d62e5e8 | 382 | } |
611cb4a5 | 383 | |
da6d8c04 DJ |
384 | /* Start an inferior process and returns its pid. |
385 | ALLARGS is a vector of program-name and args. */ | |
386 | ||
ce3a066d DJ |
387 | static int |
388 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 389 | { |
a6dbe5df | 390 | struct lwp_info *new_lwp; |
da6d8c04 | 391 | int pid; |
95954743 | 392 | ptid_t ptid; |
da6d8c04 | 393 | |
42c81e2a | 394 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
395 | pid = vfork (); |
396 | #else | |
da6d8c04 | 397 | pid = fork (); |
52fb6437 | 398 | #endif |
da6d8c04 DJ |
399 | if (pid < 0) |
400 | perror_with_name ("fork"); | |
401 | ||
402 | if (pid == 0) | |
403 | { | |
404 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
405 | ||
254787d4 | 406 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 407 | |
a9fa9f7d DJ |
408 | setpgid (0, 0); |
409 | ||
2b876972 DJ |
410 | execv (program, allargs); |
411 | if (errno == ENOENT) | |
412 | execvp (program, allargs); | |
da6d8c04 DJ |
413 | |
414 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 415 | strerror (errno)); |
da6d8c04 DJ |
416 | fflush (stderr); |
417 | _exit (0177); | |
418 | } | |
419 | ||
95954743 PA |
420 | linux_add_process (pid, 0); |
421 | ||
422 | ptid = ptid_build (pid, pid, 0); | |
423 | new_lwp = add_lwp (ptid); | |
424 | add_thread (ptid, new_lwp); | |
a6dbe5df | 425 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 426 | |
a9fa9f7d | 427 | return pid; |
da6d8c04 DJ |
428 | } |
429 | ||
430 | /* Attach to an inferior process. */ | |
431 | ||
95954743 PA |
432 | static void |
433 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 434 | { |
95954743 | 435 | ptid_t ptid; |
54a0b537 | 436 | struct lwp_info *new_lwp; |
611cb4a5 | 437 | |
95954743 | 438 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 439 | { |
95954743 | 440 | if (!initial) |
2d717e4f DJ |
441 | { |
442 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 443 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
444 | strerror (errno), errno); |
445 | fflush (stderr); | |
446 | return; | |
447 | } | |
448 | else | |
449 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 450 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 451 | strerror (errno), errno); |
da6d8c04 DJ |
452 | } |
453 | ||
95954743 PA |
454 | if (initial) |
455 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
456 | ptid = ptid_build (lwpid, lwpid, 0); | |
457 | else | |
458 | { | |
459 | /* Note that extracting the pid from the current inferior is | |
460 | safe, since we're always called in the context of the same | |
461 | process as this new thread. */ | |
462 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
463 | ptid = ptid_build (pid, lwpid, 0); | |
464 | } | |
24a09b5f | 465 | |
95954743 PA |
466 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
467 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 468 | |
a6dbe5df PA |
469 | |
470 | /* We need to wait for SIGSTOP before being able to make the next | |
471 | ptrace call on this LWP. */ | |
472 | new_lwp->must_set_ptrace_flags = 1; | |
473 | ||
0d62e5e8 | 474 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
475 | brings it to a halt. |
476 | ||
477 | There are several cases to consider here: | |
478 | ||
479 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 PA |
480 | of a new thread that is being created. |
481 | In this case we should ignore that SIGSTOP and resume the process. | |
482 | This is handled below by setting stop_expected = 1. | |
0e21c1ec DE |
483 | |
484 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
485 | to it via attach_inferior. |
486 | In this case we want the process thread to stop. | |
487 | This is handled by having linux_attach clear stop_expected after | |
488 | we return. | |
489 | ??? If the process already has several threads we leave the other | |
490 | threads running. | |
0e21c1ec DE |
491 | |
492 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
493 | existing threads. |
494 | In this case we want the thread to stop. | |
495 | FIXME: This case is currently not properly handled. | |
496 | We should wait for the SIGSTOP but don't. Things work apparently | |
497 | because enough time passes between when we ptrace (ATTACH) and when | |
498 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
499 | |
500 | On the other hand, if we are currently trying to stop all threads, we | |
501 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 502 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
503 | end of the list, and so the new thread has not yet reached |
504 | wait_for_sigstop (but will). */ | |
0d62e5e8 | 505 | if (! stopping_threads) |
54a0b537 | 506 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
507 | } |
508 | ||
95954743 PA |
509 | void |
510 | linux_attach_lwp (unsigned long lwpid) | |
511 | { | |
512 | linux_attach_lwp_1 (lwpid, 0); | |
513 | } | |
514 | ||
0d62e5e8 | 515 | int |
a1928bad | 516 | linux_attach (unsigned long pid) |
0d62e5e8 | 517 | { |
54a0b537 | 518 | struct lwp_info *lwp; |
0d62e5e8 | 519 | |
95954743 PA |
520 | linux_attach_lwp_1 (pid, 1); |
521 | ||
522 | linux_add_process (pid, 1); | |
0d62e5e8 | 523 | |
bd99dc85 PA |
524 | if (!non_stop) |
525 | { | |
526 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
527 | process. It will be collected by wait shortly. */ | |
95954743 PA |
528 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
529 | ptid_build (pid, pid, 0)); | |
bd99dc85 PA |
530 | lwp->stop_expected = 0; |
531 | } | |
0d62e5e8 | 532 | |
95954743 PA |
533 | return 0; |
534 | } | |
535 | ||
536 | struct counter | |
537 | { | |
538 | int pid; | |
539 | int count; | |
540 | }; | |
541 | ||
542 | static int | |
543 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
544 | { | |
545 | struct counter *counter = args; | |
546 | ||
547 | if (ptid_get_pid (entry->id) == counter->pid) | |
548 | { | |
549 | if (++counter->count > 1) | |
550 | return 1; | |
551 | } | |
d61ddec4 | 552 | |
da6d8c04 DJ |
553 | return 0; |
554 | } | |
555 | ||
95954743 PA |
556 | static int |
557 | last_thread_of_process_p (struct thread_info *thread) | |
558 | { | |
559 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
560 | int pid = ptid_get_pid (ptid); | |
561 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 562 | |
95954743 PA |
563 | return (find_inferior (&all_threads, |
564 | second_thread_of_pid_p, &counter) == NULL); | |
565 | } | |
566 | ||
567 | /* Kill the inferior lwp. */ | |
568 | ||
569 | static int | |
570 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 571 | { |
0d62e5e8 | 572 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 573 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 574 | int wstat; |
95954743 PA |
575 | int pid = * (int *) args; |
576 | ||
577 | if (ptid_get_pid (entry->id) != pid) | |
578 | return 0; | |
0d62e5e8 | 579 | |
fd500816 DJ |
580 | /* We avoid killing the first thread here, because of a Linux kernel (at |
581 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
582 | the children get a chance to be reaped, it will remain a zombie | |
583 | forever. */ | |
95954743 PA |
584 | |
585 | if (last_thread_of_process_p (thread)) | |
586 | { | |
587 | if (debug_threads) | |
588 | fprintf (stderr, "lkop: is last of process %s\n", | |
589 | target_pid_to_str (entry->id)); | |
590 | return 0; | |
591 | } | |
fd500816 | 592 | |
bd99dc85 PA |
593 | /* If we're killing a running inferior, make sure it is stopped |
594 | first, as PTRACE_KILL will not work otherwise. */ | |
595 | if (!lwp->stopped) | |
596 | send_sigstop (&lwp->head); | |
597 | ||
0d62e5e8 DJ |
598 | do |
599 | { | |
bd99dc85 | 600 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
601 | |
602 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 603 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 604 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
605 | |
606 | return 0; | |
da6d8c04 DJ |
607 | } |
608 | ||
95954743 PA |
609 | static int |
610 | linux_kill (int pid) | |
0d62e5e8 | 611 | { |
95954743 | 612 | struct process_info *process; |
54a0b537 | 613 | struct lwp_info *lwp; |
95954743 | 614 | struct thread_info *thread; |
fd500816 | 615 | int wstat; |
95954743 | 616 | int lwpid; |
fd500816 | 617 | |
95954743 PA |
618 | process = find_process_pid (pid); |
619 | if (process == NULL) | |
620 | return -1; | |
9d606399 | 621 | |
95954743 | 622 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 623 | |
54a0b537 | 624 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 625 | thread in the list, so do so now. */ |
95954743 PA |
626 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
627 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
628 | |
629 | if (debug_threads) | |
95954743 PA |
630 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
631 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
632 | |
633 | /* If we're killing a running inferior, make sure it is stopped | |
634 | first, as PTRACE_KILL will not work otherwise. */ | |
635 | if (!lwp->stopped) | |
636 | send_sigstop (&lwp->head); | |
637 | ||
fd500816 DJ |
638 | do |
639 | { | |
bd99dc85 | 640 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
641 | |
642 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
643 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
644 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 645 | |
bd99dc85 | 646 | delete_lwp (lwp); |
5091eb23 | 647 | linux_remove_process (process); |
95954743 | 648 | return 0; |
0d62e5e8 DJ |
649 | } |
650 | ||
95954743 PA |
651 | static int |
652 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
653 | { |
654 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 655 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
656 | int pid = * (int *) args; |
657 | ||
658 | if (ptid_get_pid (entry->id) != pid) | |
659 | return 0; | |
6ad8ae5c | 660 | |
bd99dc85 PA |
661 | /* If we're detaching from a running inferior, make sure it is |
662 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
663 | if (!lwp->stopped) | |
664 | { | |
95954743 | 665 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
666 | |
667 | stopping_threads = 1; | |
668 | send_sigstop (&lwp->head); | |
669 | ||
670 | /* If this detects a new thread through a clone event, the new | |
671 | thread is appended to the end of the lwp list, so we'll | |
672 | eventually detach from it. */ | |
673 | wait_for_sigstop (&lwp->head); | |
674 | stopping_threads = 0; | |
675 | ||
676 | /* If LWP exits while we're trying to stop it, there's nothing | |
677 | left to do. */ | |
95954743 | 678 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 679 | if (lwp == NULL) |
95954743 | 680 | return 0; |
bd99dc85 PA |
681 | } |
682 | ||
ae13219e DJ |
683 | /* Make sure the process isn't stopped at a breakpoint that's |
684 | no longer there. */ | |
54a0b537 | 685 | check_removed_breakpoint (lwp); |
ae13219e DJ |
686 | |
687 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
688 | sure we take care of that now. This isn't absolutely guaranteed | |
689 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 690 | if (lwp->stop_expected) |
ae13219e | 691 | { |
bd99dc85 | 692 | int wstat; |
ae13219e | 693 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
694 | lwp->stop_expected = 0; |
695 | if (lwp->stopped) | |
2acc282a | 696 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 697 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
698 | } |
699 | ||
700 | /* Flush any pending changes to the process's registers. */ | |
701 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 702 | get_lwp_thread (lwp)); |
ae13219e DJ |
703 | |
704 | /* Finally, let it resume. */ | |
bd99dc85 PA |
705 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
706 | ||
707 | delete_lwp (lwp); | |
95954743 | 708 | return 0; |
6ad8ae5c DJ |
709 | } |
710 | ||
dd6953e1 | 711 | static int |
95954743 | 712 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 713 | { |
95954743 PA |
714 | int *pid_p = args; |
715 | ||
716 | if (ptid_get_pid (entry->id) == *pid_p) | |
717 | return 1; | |
718 | ||
719 | return 0; | |
720 | } | |
721 | ||
722 | static int | |
723 | linux_detach (int pid) | |
724 | { | |
725 | struct process_info *process; | |
726 | ||
727 | process = find_process_pid (pid); | |
728 | if (process == NULL) | |
729 | return -1; | |
730 | ||
731 | current_inferior = | |
732 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
733 | ||
ae13219e | 734 | delete_all_breakpoints (); |
95954743 | 735 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
5091eb23 | 736 | linux_remove_process (process); |
dd6953e1 | 737 | return 0; |
6ad8ae5c DJ |
738 | } |
739 | ||
444d6139 | 740 | static void |
95954743 | 741 | linux_join (int pid) |
444d6139 | 742 | { |
444d6139 | 743 | int status, ret; |
95954743 | 744 | struct process_info *process; |
bd99dc85 | 745 | |
95954743 PA |
746 | process = find_process_pid (pid); |
747 | if (process == NULL) | |
748 | return; | |
444d6139 PA |
749 | |
750 | do { | |
95954743 | 751 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
752 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
753 | break; | |
754 | } while (ret != -1 || errno != ECHILD); | |
755 | } | |
756 | ||
6ad8ae5c | 757 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 758 | static int |
95954743 | 759 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 760 | { |
95954743 PA |
761 | struct lwp_info *lwp = find_lwp_pid (ptid); |
762 | ||
763 | /* We assume we always know if a thread exits. If a whole process | |
764 | exited but we still haven't been able to report it to GDB, we'll | |
765 | hold on to the last lwp of the dead process. */ | |
766 | if (lwp != NULL) | |
767 | return !lwp->dead; | |
0d62e5e8 DJ |
768 | else |
769 | return 0; | |
770 | } | |
771 | ||
772 | /* Return nonzero if this process stopped at a breakpoint which | |
773 | no longer appears to be inserted. Also adjust the PC | |
774 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 775 | static int |
54a0b537 | 776 | check_removed_breakpoint (struct lwp_info *event_child) |
da6d8c04 | 777 | { |
0d62e5e8 DJ |
778 | CORE_ADDR stop_pc; |
779 | struct thread_info *saved_inferior; | |
780 | ||
781 | if (event_child->pending_is_breakpoint == 0) | |
782 | return 0; | |
783 | ||
784 | if (debug_threads) | |
54a0b537 | 785 | fprintf (stderr, "Checking for breakpoint in lwp %ld.\n", |
bd99dc85 | 786 | lwpid_of (event_child)); |
0d62e5e8 DJ |
787 | |
788 | saved_inferior = current_inferior; | |
54a0b537 | 789 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 DJ |
790 | |
791 | stop_pc = get_stop_pc (); | |
792 | ||
793 | /* If the PC has changed since we stopped, then we shouldn't do | |
794 | anything. This happens if, for instance, GDB handled the | |
795 | decr_pc_after_break subtraction itself. */ | |
796 | if (stop_pc != event_child->pending_stop_pc) | |
797 | { | |
798 | if (debug_threads) | |
ae13219e DJ |
799 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
800 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
801 | |
802 | event_child->pending_is_breakpoint = 0; | |
803 | current_inferior = saved_inferior; | |
804 | return 0; | |
805 | } | |
806 | ||
807 | /* If the breakpoint is still there, we will report hitting it. */ | |
808 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
809 | { | |
810 | if (debug_threads) | |
811 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
812 | current_inferior = saved_inferior; | |
813 | return 0; | |
814 | } | |
815 | ||
816 | if (debug_threads) | |
817 | fprintf (stderr, "Removed breakpoint.\n"); | |
818 | ||
819 | /* For decr_pc_after_break targets, here is where we perform the | |
820 | decrement. We go immediately from this function to resuming, | |
821 | and can not safely call get_stop_pc () again. */ | |
822 | if (the_low_target.set_pc != NULL) | |
47c0c975 DE |
823 | { |
824 | if (debug_threads) | |
825 | fprintf (stderr, "Set pc to 0x%lx\n", (long) stop_pc); | |
826 | (*the_low_target.set_pc) (stop_pc); | |
827 | } | |
0d62e5e8 DJ |
828 | |
829 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 830 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
831 | event_child->status_pending_p = 0; |
832 | event_child->status_pending = 0; | |
833 | ||
834 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
835 | return 1; |
836 | } | |
837 | ||
54a0b537 PA |
838 | /* Return 1 if this lwp has an interesting status pending. This |
839 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 840 | static int |
95954743 | 841 | status_pending_p (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 842 | { |
54a0b537 | 843 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 PA |
844 | ptid_t ptid = * (ptid_t *) arg; |
845 | ||
846 | /* Check if we're only interested in events from a specific process | |
847 | or its lwps. */ | |
848 | if (!ptid_equal (minus_one_ptid, ptid) | |
849 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
850 | return 0; | |
0d62e5e8 | 851 | |
bd99dc85 | 852 | if (lwp->status_pending_p && !lwp->suspended) |
54a0b537 | 853 | if (check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
854 | { |
855 | /* This thread was stopped at a breakpoint, and the breakpoint | |
856 | is now gone. We were told to continue (or step...) all threads, | |
857 | so GDB isn't trying to single-step past this breakpoint. | |
858 | So instead of reporting the old SIGTRAP, pretend we got to | |
859 | the breakpoint just after it was removed instead of just | |
860 | before; resume the process. */ | |
2acc282a | 861 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
0d62e5e8 DJ |
862 | return 0; |
863 | } | |
864 | ||
bd99dc85 | 865 | return (lwp->status_pending_p && !lwp->suspended); |
0d62e5e8 DJ |
866 | } |
867 | ||
95954743 PA |
868 | static int |
869 | same_lwp (struct inferior_list_entry *entry, void *data) | |
870 | { | |
871 | ptid_t ptid = *(ptid_t *) data; | |
872 | int lwp; | |
873 | ||
874 | if (ptid_get_lwp (ptid) != 0) | |
875 | lwp = ptid_get_lwp (ptid); | |
876 | else | |
877 | lwp = ptid_get_pid (ptid); | |
878 | ||
879 | if (ptid_get_lwp (entry->id) == lwp) | |
880 | return 1; | |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
885 | struct lwp_info * | |
886 | find_lwp_pid (ptid_t ptid) | |
887 | { | |
888 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
889 | } | |
890 | ||
bd99dc85 | 891 | static struct lwp_info * |
95954743 | 892 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 893 | { |
0d62e5e8 | 894 | int ret; |
95954743 | 895 | int to_wait_for = -1; |
bd99dc85 | 896 | struct lwp_info *child = NULL; |
0d62e5e8 | 897 | |
bd99dc85 | 898 | if (debug_threads) |
95954743 PA |
899 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
900 | ||
901 | if (ptid_equal (ptid, minus_one_ptid)) | |
902 | to_wait_for = -1; /* any child */ | |
903 | else | |
904 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 905 | |
bd99dc85 | 906 | options |= __WALL; |
0d62e5e8 | 907 | |
bd99dc85 | 908 | retry: |
0d62e5e8 | 909 | |
bd99dc85 PA |
910 | ret = my_waitpid (to_wait_for, wstatp, options); |
911 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
912 | return NULL; | |
913 | else if (ret == -1) | |
914 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
915 | |
916 | if (debug_threads | |
917 | && (!WIFSTOPPED (*wstatp) | |
918 | || (WSTOPSIG (*wstatp) != 32 | |
919 | && WSTOPSIG (*wstatp) != 33))) | |
920 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
921 | ||
95954743 | 922 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 923 | |
24a09b5f DJ |
924 | /* If we didn't find a process, one of two things presumably happened: |
925 | - A process we started and then detached from has exited. Ignore it. | |
926 | - A process we are controlling has forked and the new child's stop | |
927 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 928 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
929 | { |
930 | add_pid_to_list (&stopped_pids, ret); | |
931 | goto retry; | |
932 | } | |
bd99dc85 | 933 | else if (child == NULL) |
24a09b5f DJ |
934 | goto retry; |
935 | ||
bd99dc85 PA |
936 | child->stopped = 1; |
937 | child->pending_is_breakpoint = 0; | |
0d62e5e8 | 938 | |
bd99dc85 | 939 | child->last_status = *wstatp; |
32ca6d61 | 940 | |
d61ddec4 UW |
941 | /* Architecture-specific setup after inferior is running. |
942 | This needs to happen after we have attached to the inferior | |
943 | and it is stopped for the first time, but before we access | |
944 | any inferior registers. */ | |
945 | if (new_inferior) | |
946 | { | |
947 | the_low_target.arch_setup (); | |
52fa2412 UW |
948 | #ifdef HAVE_LINUX_REGSETS |
949 | memset (disabled_regsets, 0, num_regsets); | |
950 | #endif | |
d61ddec4 UW |
951 | new_inferior = 0; |
952 | } | |
953 | ||
0d62e5e8 | 954 | if (debug_threads |
47c0c975 DE |
955 | && WIFSTOPPED (*wstatp) |
956 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 957 | { |
896c7fbb | 958 | struct thread_info *saved_inferior = current_inferior; |
47c0c975 DE |
959 | CORE_ADDR pc; |
960 | ||
0d62e5e8 | 961 | current_inferior = (struct thread_info *) |
95954743 | 962 | find_inferior_id (&all_threads, child->head.id); |
47c0c975 DE |
963 | pc = (*the_low_target.get_pc) (); |
964 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); | |
896c7fbb | 965 | current_inferior = saved_inferior; |
0d62e5e8 | 966 | } |
bd99dc85 PA |
967 | |
968 | return child; | |
0d62e5e8 | 969 | } |
611cb4a5 | 970 | |
bd99dc85 PA |
971 | /* Wait for an event from child PID. If PID is -1, wait for any |
972 | child. Store the stop status through the status pointer WSTAT. | |
973 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
974 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
975 | the stopped child otherwise. */ | |
976 | ||
0d62e5e8 | 977 | static int |
95954743 | 978 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 DJ |
979 | { |
980 | CORE_ADDR stop_pc; | |
bd99dc85 | 981 | struct lwp_info *event_child = NULL; |
b65d95c5 | 982 | int bp_status; |
bd99dc85 | 983 | struct lwp_info *requested_child = NULL; |
0d62e5e8 | 984 | |
95954743 | 985 | /* Check for a lwp with a pending status. */ |
0d62e5e8 DJ |
986 | /* It is possible that the user changed the pending task's registers since |
987 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 988 | (in check_removed_breakpoint); signals should be reported anyway. */ |
bd99dc85 | 989 | |
95954743 PA |
990 | if (ptid_equal (ptid, minus_one_ptid) |
991 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 992 | { |
54a0b537 | 993 | event_child = (struct lwp_info *) |
95954743 | 994 | find_inferior (&all_lwps, status_pending_p, &ptid); |
0d62e5e8 | 995 | if (debug_threads && event_child) |
bd99dc85 | 996 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
997 | } |
998 | else | |
999 | { | |
95954743 | 1000 | requested_child = find_lwp_pid (ptid); |
bd99dc85 PA |
1001 | if (requested_child->status_pending_p |
1002 | && !check_removed_breakpoint (requested_child)) | |
1003 | event_child = requested_child; | |
0d62e5e8 | 1004 | } |
611cb4a5 | 1005 | |
0d62e5e8 DJ |
1006 | if (event_child != NULL) |
1007 | { | |
bd99dc85 PA |
1008 | if (debug_threads) |
1009 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1010 | lwpid_of (event_child), event_child->status_pending); | |
1011 | *wstat = event_child->status_pending; | |
1012 | event_child->status_pending_p = 0; | |
1013 | event_child->status_pending = 0; | |
1014 | current_inferior = get_lwp_thread (event_child); | |
1015 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1016 | } |
1017 | ||
1018 | /* We only enter this loop if no process has a pending wait status. Thus | |
1019 | any action taken in response to a wait status inside this loop is | |
1020 | responding as soon as we detect the status, not after any pending | |
1021 | events. */ | |
1022 | while (1) | |
1023 | { | |
95954743 | 1024 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1025 | |
bd99dc85 PA |
1026 | if ((options & WNOHANG) && event_child == NULL) |
1027 | return 0; | |
0d62e5e8 DJ |
1028 | |
1029 | if (event_child == NULL) | |
1030 | error ("event from unknown child"); | |
611cb4a5 | 1031 | |
bd99dc85 | 1032 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1033 | |
89be2091 | 1034 | /* Check for thread exit. */ |
bd99dc85 | 1035 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1036 | { |
89be2091 | 1037 | if (debug_threads) |
95954743 | 1038 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1039 | |
1040 | /* If the last thread is exiting, just return. */ | |
95954743 | 1041 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1042 | { |
1043 | if (debug_threads) | |
95954743 PA |
1044 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1045 | lwpid_of (event_child)); | |
bd99dc85 PA |
1046 | return lwpid_of (event_child); |
1047 | } | |
89be2091 | 1048 | |
bd99dc85 | 1049 | delete_lwp (event_child); |
89be2091 | 1050 | |
bd99dc85 PA |
1051 | if (!non_stop) |
1052 | { | |
1053 | current_inferior = (struct thread_info *) all_threads.head; | |
1054 | if (debug_threads) | |
1055 | fprintf (stderr, "Current inferior is now %ld\n", | |
1056 | lwpid_of (get_thread_lwp (current_inferior))); | |
1057 | } | |
1058 | else | |
1059 | { | |
1060 | current_inferior = NULL; | |
1061 | if (debug_threads) | |
1062 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1063 | } | |
89be2091 DJ |
1064 | |
1065 | /* If we were waiting for this particular child to do something... | |
1066 | well, it did something. */ | |
bd99dc85 | 1067 | if (requested_child != NULL) |
95954743 | 1068 | return lwpid_of (event_child); |
89be2091 DJ |
1069 | |
1070 | /* Wait for a more interesting event. */ | |
1071 | continue; | |
1072 | } | |
1073 | ||
a6dbe5df PA |
1074 | if (event_child->must_set_ptrace_flags) |
1075 | { | |
1076 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
1077 | 0, PTRACE_O_TRACECLONE); | |
1078 | event_child->must_set_ptrace_flags = 0; | |
1079 | } | |
1080 | ||
bd99dc85 PA |
1081 | if (WIFSTOPPED (*wstat) |
1082 | && WSTOPSIG (*wstat) == SIGSTOP | |
89be2091 DJ |
1083 | && event_child->stop_expected) |
1084 | { | |
1085 | if (debug_threads) | |
1086 | fprintf (stderr, "Expected stop.\n"); | |
1087 | event_child->stop_expected = 0; | |
2acc282a | 1088 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
89be2091 DJ |
1089 | continue; |
1090 | } | |
1091 | ||
bd99dc85 PA |
1092 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1093 | && *wstat >> 16 != 0) | |
24a09b5f | 1094 | { |
bd99dc85 | 1095 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1096 | continue; |
1097 | } | |
1098 | ||
89be2091 DJ |
1099 | /* If GDB is not interested in this signal, don't stop other |
1100 | threads, and don't report it to GDB. Just resume the | |
1101 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1102 | signals as well as any that GDB specifically requested we |
1103 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1104 | and do not ignore signals when stepping - they may require | |
1105 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1106 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1107 | thread library? */ | |
bd99dc85 | 1108 | if (WIFSTOPPED (*wstat) |
69f223ed | 1109 | && !event_child->stepping |
24a09b5f DJ |
1110 | && ( |
1111 | #ifdef USE_THREAD_DB | |
95954743 | 1112 | (current_process ()->private->thread_db_active |
bd99dc85 PA |
1113 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1114 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1115 | || |
1116 | #endif | |
bd99dc85 PA |
1117 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
1118 | && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
1119 | { |
1120 | siginfo_t info, *info_p; | |
1121 | ||
1122 | if (debug_threads) | |
24a09b5f | 1123 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1124 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1125 | |
bd99dc85 | 1126 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1127 | info_p = &info; |
1128 | else | |
1129 | info_p = NULL; | |
2acc282a | 1130 | linux_resume_one_lwp (event_child, |
54a0b537 | 1131 | event_child->stepping, |
bd99dc85 | 1132 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1133 | continue; |
0d62e5e8 | 1134 | } |
611cb4a5 | 1135 | |
0d62e5e8 DJ |
1136 | /* If this event was not handled above, and is not a SIGTRAP, report |
1137 | it. */ | |
bd99dc85 PA |
1138 | if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP) |
1139 | return lwpid_of (event_child); | |
611cb4a5 | 1140 | |
0d62e5e8 DJ |
1141 | /* If this target does not support breakpoints, we simply report the |
1142 | SIGTRAP; it's of no concern to us. */ | |
1143 | if (the_low_target.get_pc == NULL) | |
bd99dc85 | 1144 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1145 | |
1146 | stop_pc = get_stop_pc (); | |
1147 | ||
1148 | /* bp_reinsert will only be set if we were single-stepping. | |
1149 | Notice that we will resume the process after hitting | |
1150 | a gdbserver breakpoint; single-stepping to/over one | |
1151 | is not supported (yet). */ | |
1152 | if (event_child->bp_reinsert != 0) | |
1153 | { | |
1154 | if (debug_threads) | |
1155 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
1156 | reinsert_breakpoint (event_child->bp_reinsert); | |
1157 | event_child->bp_reinsert = 0; | |
1158 | ||
1159 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
2acc282a | 1160 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
0d62e5e8 DJ |
1161 | continue; |
1162 | } | |
1163 | ||
b65d95c5 | 1164 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 1165 | |
b65d95c5 | 1166 | if (bp_status != 0) |
0d62e5e8 | 1167 | { |
b65d95c5 DJ |
1168 | if (debug_threads) |
1169 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1170 | ||
0d62e5e8 | 1171 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 1172 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
1173 | adjustment for us at the appropriate time. */ |
1174 | event_child->pending_is_breakpoint = 1; | |
1175 | event_child->pending_stop_pc = stop_pc; | |
1176 | ||
b65d95c5 | 1177 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
1178 | loop instead of simply replacing the breakpoint right away, |
1179 | in order to not lose signals sent to the thread that hit the | |
1180 | breakpoint. Unfortunately this increases the window where another | |
1181 | thread could sneak past the removed breakpoint. For the current | |
1182 | use of server-side breakpoints (thread creation) this is | |
1183 | acceptable; but it needs to be considered before this breakpoint | |
1184 | mechanism can be used in more general ways. For some breakpoints | |
1185 | it may be necessary to stop all other threads, but that should | |
1186 | be avoided where possible. | |
1187 | ||
1188 | If breakpoint_reinsert_addr is NULL, that means that we can | |
1189 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
1190 | mark it for reinsertion, and single-step. | |
1191 | ||
1192 | Otherwise, call the target function to figure out where we need | |
1193 | our temporary breakpoint, create it, and continue executing this | |
1194 | process. */ | |
bd99dc85 PA |
1195 | |
1196 | /* NOTE: we're lifting breakpoints in non-stop mode. This | |
1197 | is currently only used for thread event breakpoints, so | |
1198 | it isn't that bad as long as we have PTRACE_EVENT_CLONE | |
1199 | events. */ | |
b65d95c5 DJ |
1200 | if (bp_status == 2) |
1201 | /* No need to reinsert. */ | |
2acc282a | 1202 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
b65d95c5 | 1203 | else if (the_low_target.breakpoint_reinsert_addr == NULL) |
0d62e5e8 DJ |
1204 | { |
1205 | event_child->bp_reinsert = stop_pc; | |
1206 | uninsert_breakpoint (stop_pc); | |
2acc282a | 1207 | linux_resume_one_lwp (event_child, 1, 0, NULL); |
0d62e5e8 DJ |
1208 | } |
1209 | else | |
1210 | { | |
1211 | reinsert_breakpoint_by_bp | |
1212 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
2acc282a | 1213 | linux_resume_one_lwp (event_child, 0, 0, NULL); |
611cb4a5 | 1214 | } |
0d62e5e8 DJ |
1215 | |
1216 | continue; | |
1217 | } | |
1218 | ||
b65d95c5 DJ |
1219 | if (debug_threads) |
1220 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
1221 | ||
0d62e5e8 | 1222 | /* If we were single-stepping, we definitely want to report the |
c35fafde PA |
1223 | SIGTRAP. Although the single-step operation has completed, |
1224 | do not clear clear the stepping flag yet; we need to check it | |
1225 | in wait_for_sigstop. */ | |
0d62e5e8 | 1226 | if (event_child->stepping) |
bd99dc85 | 1227 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1228 | |
1229 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
1230 | Check if it is a breakpoint, and if so mark the process information | |
1231 | accordingly. This will handle both the necessary fiddling with the | |
1232 | PC on decr_pc_after_break targets and suppressing extra threads | |
1233 | hitting a breakpoint if two hit it at once and then GDB removes it | |
1234 | after the first is reported. Arguably it would be better to report | |
1235 | multiple threads hitting breakpoints simultaneously, but the current | |
1236 | remote protocol does not allow this. */ | |
1237 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
1238 | { | |
1239 | event_child->pending_is_breakpoint = 1; | |
1240 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
1241 | } |
1242 | ||
bd99dc85 | 1243 | return lwpid_of (event_child); |
611cb4a5 | 1244 | } |
0d62e5e8 | 1245 | |
611cb4a5 DJ |
1246 | /* NOTREACHED */ |
1247 | return 0; | |
1248 | } | |
1249 | ||
95954743 PA |
1250 | static int |
1251 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1252 | { | |
1253 | ptid_t wait_ptid; | |
1254 | ||
1255 | if (ptid_is_pid (ptid)) | |
1256 | { | |
1257 | /* A request to wait for a specific tgid. This is not possible | |
1258 | with waitpid, so instead, we wait for any child, and leave | |
1259 | children we're not interested in right now with a pending | |
1260 | status to report later. */ | |
1261 | wait_ptid = minus_one_ptid; | |
1262 | } | |
1263 | else | |
1264 | wait_ptid = ptid; | |
1265 | ||
1266 | while (1) | |
1267 | { | |
1268 | int event_pid; | |
1269 | ||
1270 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1271 | ||
1272 | if (event_pid > 0 | |
1273 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1274 | { | |
1275 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1276 | ||
1277 | if (! WIFSTOPPED (*wstat)) | |
1278 | mark_lwp_dead (event_child, *wstat); | |
1279 | else | |
1280 | { | |
1281 | event_child->status_pending_p = 1; | |
1282 | event_child->status_pending = *wstat; | |
1283 | } | |
1284 | } | |
1285 | else | |
1286 | return event_pid; | |
1287 | } | |
1288 | } | |
1289 | ||
0d62e5e8 | 1290 | /* Wait for process, returns status. */ |
da6d8c04 | 1291 | |
95954743 PA |
1292 | static ptid_t |
1293 | linux_wait_1 (ptid_t ptid, | |
1294 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1295 | { |
e5f1222d | 1296 | int w; |
bd99dc85 PA |
1297 | struct thread_info *thread = NULL; |
1298 | struct lwp_info *lwp = NULL; | |
1299 | int options; | |
bd99dc85 PA |
1300 | int pid; |
1301 | ||
1302 | /* Translate generic target options into linux options. */ | |
1303 | options = __WALL; | |
1304 | if (target_options & TARGET_WNOHANG) | |
1305 | options |= WNOHANG; | |
0d62e5e8 DJ |
1306 | |
1307 | retry: | |
bd99dc85 PA |
1308 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1309 | ||
0d62e5e8 DJ |
1310 | /* If we were only supposed to resume one thread, only wait for |
1311 | that thread - if it's still alive. If it died, however - which | |
1312 | can happen if we're coming from the thread death case below - | |
1313 | then we need to make sure we restart the other threads. We could | |
1314 | pick a thread at random or restart all; restarting all is less | |
1315 | arbitrary. */ | |
95954743 PA |
1316 | if (!non_stop |
1317 | && !ptid_equal (cont_thread, null_ptid) | |
1318 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1319 | { |
bd99dc85 PA |
1320 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1321 | cont_thread); | |
0d62e5e8 DJ |
1322 | |
1323 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1324 | if (thread == NULL) |
64386c31 DJ |
1325 | { |
1326 | struct thread_resume resume_info; | |
95954743 | 1327 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1328 | resume_info.kind = resume_continue; |
1329 | resume_info.sig = 0; | |
2bd7c093 | 1330 | linux_resume (&resume_info, 1); |
64386c31 | 1331 | } |
bd99dc85 | 1332 | else |
95954743 | 1333 | ptid = cont_thread; |
0d62e5e8 | 1334 | } |
da6d8c04 | 1335 | |
95954743 | 1336 | pid = linux_wait_for_event (ptid, &w, options); |
bd99dc85 | 1337 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1338 | return null_ptid; |
bd99dc85 PA |
1339 | |
1340 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1341 | |
0d62e5e8 DJ |
1342 | /* If we are waiting for a particular child, and it exited, |
1343 | linux_wait_for_event will return its exit status. Similarly if | |
1344 | the last child exited. If this is not the last child, however, | |
1345 | do not report it as exited until there is a 'thread exited' response | |
1346 | available in the remote protocol. Instead, just wait for another event. | |
1347 | This should be safe, because if the thread crashed we will already | |
1348 | have reported the termination signal to GDB; that should stop any | |
1349 | in-progress stepping operations, etc. | |
1350 | ||
1351 | Report the exit status of the last thread to exit. This matches | |
1352 | LinuxThreads' behavior. */ | |
1353 | ||
95954743 | 1354 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1355 | { |
bd99dc85 | 1356 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1357 | { |
95954743 PA |
1358 | int pid = pid_of (lwp); |
1359 | struct process_info *process = find_process_pid (pid); | |
5b1c542e | 1360 | |
bd99dc85 | 1361 | delete_lwp (lwp); |
5091eb23 | 1362 | linux_remove_process (process); |
5b1c542e | 1363 | |
bd99dc85 | 1364 | current_inferior = NULL; |
5b1c542e | 1365 | |
bd99dc85 PA |
1366 | if (WIFEXITED (w)) |
1367 | { | |
1368 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1369 | ourstatus->value.integer = WEXITSTATUS (w); | |
1370 | ||
1371 | if (debug_threads) | |
1372 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1373 | } | |
1374 | else | |
1375 | { | |
1376 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1377 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1378 | ||
1379 | if (debug_threads) | |
1380 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1381 | ||
1382 | } | |
5b1c542e | 1383 | |
95954743 | 1384 | return pid_to_ptid (pid); |
0d62e5e8 | 1385 | } |
da6d8c04 | 1386 | } |
0d62e5e8 | 1387 | else |
da6d8c04 | 1388 | { |
0d62e5e8 DJ |
1389 | if (!WIFSTOPPED (w)) |
1390 | goto retry; | |
da6d8c04 DJ |
1391 | } |
1392 | ||
bd99dc85 PA |
1393 | /* In all-stop, stop all threads. Be careful to only do this if |
1394 | we're about to report an event to GDB. */ | |
1395 | if (!non_stop) | |
1396 | stop_all_lwps (); | |
1397 | ||
5b1c542e | 1398 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1399 | |
bd99dc85 PA |
1400 | if (lwp->suspended && WSTOPSIG (w) == SIGSTOP) |
1401 | { | |
1402 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1403 | and it stopped cleanly, so report as SIG0. The use of | |
1404 | SIGSTOP is an implementation detail. */ | |
1405 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1406 | } | |
1407 | else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP) | |
1408 | { | |
1409 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1410 | but, it stopped for other reasons. Set stop_expected so the | |
1411 | pending SIGSTOP is ignored and the LWP is resumed. */ | |
1412 | lwp->stop_expected = 1; | |
1413 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1414 | } | |
1415 | else | |
1416 | { | |
1417 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1418 | } | |
1419 | ||
1420 | if (debug_threads) | |
95954743 PA |
1421 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
1422 | target_pid_to_str (lwp->head.id), | |
bd99dc85 PA |
1423 | ourstatus->kind, |
1424 | ourstatus->value.sig); | |
1425 | ||
95954743 | 1426 | return lwp->head.id; |
bd99dc85 PA |
1427 | } |
1428 | ||
1429 | /* Get rid of any pending event in the pipe. */ | |
1430 | static void | |
1431 | async_file_flush (void) | |
1432 | { | |
1433 | int ret; | |
1434 | char buf; | |
1435 | ||
1436 | do | |
1437 | ret = read (linux_event_pipe[0], &buf, 1); | |
1438 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1439 | } | |
1440 | ||
1441 | /* Put something in the pipe, so the event loop wakes up. */ | |
1442 | static void | |
1443 | async_file_mark (void) | |
1444 | { | |
1445 | int ret; | |
1446 | ||
1447 | async_file_flush (); | |
1448 | ||
1449 | do | |
1450 | ret = write (linux_event_pipe[1], "+", 1); | |
1451 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1452 | ||
1453 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1454 | be awakened anyway. */ | |
1455 | } | |
1456 | ||
95954743 PA |
1457 | static ptid_t |
1458 | linux_wait (ptid_t ptid, | |
1459 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1460 | { |
95954743 | 1461 | ptid_t event_ptid; |
bd99dc85 PA |
1462 | |
1463 | if (debug_threads) | |
95954743 | 1464 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1465 | |
1466 | /* Flush the async file first. */ | |
1467 | if (target_is_async_p ()) | |
1468 | async_file_flush (); | |
1469 | ||
95954743 | 1470 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1471 | |
1472 | /* If at least one stop was reported, there may be more. A single | |
1473 | SIGCHLD can signal more than one child stop. */ | |
1474 | if (target_is_async_p () | |
1475 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1476 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1477 | async_file_mark (); |
1478 | ||
1479 | return event_ptid; | |
da6d8c04 DJ |
1480 | } |
1481 | ||
fd500816 DJ |
1482 | /* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if |
1483 | thread groups are in use, we need to use tkill. */ | |
1484 | ||
1485 | static int | |
a1928bad | 1486 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 DJ |
1487 | { |
1488 | static int tkill_failed; | |
1489 | ||
1490 | errno = 0; | |
1491 | ||
1492 | #ifdef SYS_tkill | |
1493 | if (!tkill_failed) | |
1494 | { | |
1495 | int ret = syscall (SYS_tkill, lwpid, signo); | |
1496 | if (errno != ENOSYS) | |
1b3f6016 | 1497 | return ret; |
fd500816 DJ |
1498 | errno = 0; |
1499 | tkill_failed = 1; | |
1500 | } | |
1501 | #endif | |
1502 | ||
1503 | return kill (lwpid, signo); | |
1504 | } | |
1505 | ||
0d62e5e8 DJ |
1506 | static void |
1507 | send_sigstop (struct inferior_list_entry *entry) | |
1508 | { | |
54a0b537 | 1509 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1510 | int pid; |
0d62e5e8 | 1511 | |
54a0b537 | 1512 | if (lwp->stopped) |
0d62e5e8 DJ |
1513 | return; |
1514 | ||
bd99dc85 PA |
1515 | pid = lwpid_of (lwp); |
1516 | ||
0d62e5e8 DJ |
1517 | /* If we already have a pending stop signal for this process, don't |
1518 | send another. */ | |
54a0b537 | 1519 | if (lwp->stop_expected) |
0d62e5e8 | 1520 | { |
ae13219e | 1521 | if (debug_threads) |
bd99dc85 | 1522 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e DJ |
1523 | |
1524 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1525 | will receive the SIGSTOP event (instead of silently resuming and | |
1526 | waiting again). It'll be reset below. */ | |
54a0b537 | 1527 | lwp->stop_expected = 0; |
0d62e5e8 DJ |
1528 | return; |
1529 | } | |
1530 | ||
1531 | if (debug_threads) | |
bd99dc85 | 1532 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1533 | |
bd99dc85 | 1534 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1535 | } |
1536 | ||
95954743 PA |
1537 | static void |
1538 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
1539 | { | |
1540 | /* It's dead, really. */ | |
1541 | lwp->dead = 1; | |
1542 | ||
1543 | /* Store the exit status for later. */ | |
1544 | lwp->status_pending_p = 1; | |
1545 | lwp->status_pending = wstat; | |
1546 | ||
1547 | /* So that check_removed_breakpoint doesn't try to figure out if | |
1548 | this is stopped at a breakpoint. */ | |
1549 | lwp->pending_is_breakpoint = 0; | |
1550 | ||
1551 | /* Prevent trying to stop it. */ | |
1552 | lwp->stopped = 1; | |
1553 | ||
1554 | /* No further stops are expected from a dead lwp. */ | |
1555 | lwp->stop_expected = 0; | |
1556 | } | |
1557 | ||
0d62e5e8 DJ |
1558 | static void |
1559 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1560 | { | |
54a0b537 | 1561 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1562 | struct thread_info *saved_inferior; |
a1928bad | 1563 | int wstat; |
95954743 PA |
1564 | ptid_t saved_tid; |
1565 | ptid_t ptid; | |
0d62e5e8 | 1566 | |
54a0b537 | 1567 | if (lwp->stopped) |
0d62e5e8 DJ |
1568 | return; |
1569 | ||
1570 | saved_inferior = current_inferior; | |
bd99dc85 PA |
1571 | if (saved_inferior != NULL) |
1572 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1573 | else | |
95954743 | 1574 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 1575 | |
95954743 | 1576 | ptid = lwp->head.id; |
bd99dc85 PA |
1577 | |
1578 | linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
1579 | |
1580 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1581 | and record the pending SIGSTOP. If the process exited, just | |
1582 | return. */ | |
1583 | if (WIFSTOPPED (wstat) | |
1584 | && WSTOPSIG (wstat) != SIGSTOP) | |
1585 | { | |
1586 | if (debug_threads) | |
24a09b5f | 1587 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
bd99dc85 | 1588 | lwpid_of (lwp), wstat); |
c35fafde PA |
1589 | |
1590 | /* Do not leave a pending single-step finish to be reported to | |
1591 | the client. The client will give us a new action for this | |
1592 | thread, possibly a continue request --- otherwise, the client | |
1593 | would consider this pending SIGTRAP reported later a spurious | |
1594 | signal. */ | |
1595 | if (WSTOPSIG (wstat) == SIGTRAP | |
1596 | && lwp->stepping | |
1597 | && !linux_stopped_by_watchpoint ()) | |
1598 | { | |
1599 | if (debug_threads) | |
1600 | fprintf (stderr, " single-step SIGTRAP ignored\n"); | |
1601 | } | |
1602 | else | |
1603 | { | |
1604 | lwp->status_pending_p = 1; | |
1605 | lwp->status_pending = wstat; | |
1606 | } | |
54a0b537 | 1607 | lwp->stop_expected = 1; |
0d62e5e8 | 1608 | } |
95954743 PA |
1609 | else if (!WIFSTOPPED (wstat)) |
1610 | { | |
1611 | if (debug_threads) | |
1612 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
1613 | lwpid_of (lwp)); | |
1614 | ||
1615 | /* Leave this status pending for the next time we're able to | |
1616 | report it. In the mean time, we'll report this lwp as dead | |
1617 | to GDB, so GDB doesn't try to read registers and memory from | |
1618 | it. */ | |
1619 | mark_lwp_dead (lwp, wstat); | |
1620 | } | |
0d62e5e8 | 1621 | |
bd99dc85 | 1622 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
1623 | current_inferior = saved_inferior; |
1624 | else | |
1625 | { | |
1626 | if (debug_threads) | |
1627 | fprintf (stderr, "Previously current thread died.\n"); | |
1628 | ||
bd99dc85 PA |
1629 | if (non_stop) |
1630 | { | |
1631 | /* We can't change the current inferior behind GDB's back, | |
1632 | otherwise, a subsequent command may apply to the wrong | |
1633 | process. */ | |
1634 | current_inferior = NULL; | |
1635 | } | |
1636 | else | |
1637 | { | |
1638 | /* Set a valid thread as current. */ | |
1639 | set_desired_inferior (0); | |
1640 | } | |
0d62e5e8 DJ |
1641 | } |
1642 | } | |
1643 | ||
1644 | static void | |
54a0b537 | 1645 | stop_all_lwps (void) |
0d62e5e8 DJ |
1646 | { |
1647 | stopping_threads = 1; | |
54a0b537 PA |
1648 | for_each_inferior (&all_lwps, send_sigstop); |
1649 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
1650 | stopping_threads = 0; |
1651 | } | |
1652 | ||
da6d8c04 DJ |
1653 | /* Resume execution of the inferior process. |
1654 | If STEP is nonzero, single-step it. | |
1655 | If SIGNAL is nonzero, give it that signal. */ | |
1656 | ||
ce3a066d | 1657 | static void |
2acc282a | 1658 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 1659 | int step, int signal, siginfo_t *info) |
da6d8c04 | 1660 | { |
0d62e5e8 DJ |
1661 | struct thread_info *saved_inferior; |
1662 | ||
54a0b537 | 1663 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
1664 | return; |
1665 | ||
1666 | /* If we have pending signals or status, and a new signal, enqueue the | |
1667 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1668 | breakpoint; it will be picked up again below. */ | |
1669 | if (signal != 0 | |
54a0b537 PA |
1670 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
1671 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
1672 | { |
1673 | struct pending_signals *p_sig; | |
bca929d3 | 1674 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 1675 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 1676 | p_sig->signal = signal; |
32ca6d61 DJ |
1677 | if (info == NULL) |
1678 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1679 | else | |
1680 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 1681 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
1682 | } |
1683 | ||
54a0b537 | 1684 | if (lwp->status_pending_p && !check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
1685 | return; |
1686 | ||
1687 | saved_inferior = current_inferior; | |
54a0b537 | 1688 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
1689 | |
1690 | if (debug_threads) | |
1b3f6016 | 1691 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 1692 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 1693 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
1694 | |
1695 | /* This bit needs some thinking about. If we get a signal that | |
1696 | we must report while a single-step reinsert is still pending, | |
1697 | we often end up resuming the thread. It might be better to | |
1698 | (ew) allow a stack of pending events; then we could be sure that | |
1699 | the reinsert happened right away and not lose any signals. | |
1700 | ||
1701 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 1702 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
1703 | complete correctness, so it won't solve that problem. It may be |
1704 | worthwhile just to solve this one, however. */ | |
54a0b537 | 1705 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
1706 | { |
1707 | if (debug_threads) | |
54a0b537 | 1708 | fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert); |
0d62e5e8 DJ |
1709 | if (step == 0) |
1710 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1711 | step = 1; | |
1712 | ||
1713 | /* Postpone any pending signal. It was enqueued above. */ | |
1714 | signal = 0; | |
1715 | } | |
1716 | ||
54a0b537 | 1717 | check_removed_breakpoint (lwp); |
0d62e5e8 | 1718 | |
aa691b87 | 1719 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 1720 | { |
47c0c975 DE |
1721 | CORE_ADDR pc = (*the_low_target.get_pc) (); |
1722 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); | |
0d62e5e8 DJ |
1723 | } |
1724 | ||
1725 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1726 | a breakpoint. */ | |
54a0b537 | 1727 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
1728 | { |
1729 | struct pending_signals **p_sig; | |
1730 | ||
54a0b537 | 1731 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
1732 | while ((*p_sig)->prev != NULL) |
1733 | p_sig = &(*p_sig)->prev; | |
1734 | ||
1735 | signal = (*p_sig)->signal; | |
32ca6d61 | 1736 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 1737 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 1738 | |
0d62e5e8 DJ |
1739 | free (*p_sig); |
1740 | *p_sig = NULL; | |
1741 | } | |
1742 | ||
1743 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 1744 | get_lwp_thread (lwp)); |
da6d8c04 | 1745 | errno = 0; |
54a0b537 PA |
1746 | lwp->stopped = 0; |
1747 | lwp->stepping = step; | |
bd99dc85 | 1748 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal); |
0d62e5e8 DJ |
1749 | |
1750 | current_inferior = saved_inferior; | |
da6d8c04 | 1751 | if (errno) |
3221518c UW |
1752 | { |
1753 | /* ESRCH from ptrace either means that the thread was already | |
1754 | running (an error) or that it is gone (a race condition). If | |
1755 | it's gone, we will get a notification the next time we wait, | |
1756 | so we can ignore the error. We could differentiate these | |
1757 | two, but it's tricky without waiting; the thread still exists | |
1758 | as a zombie, so sending it signal 0 would succeed. So just | |
1759 | ignore ESRCH. */ | |
1760 | if (errno == ESRCH) | |
1761 | return; | |
1762 | ||
1763 | perror_with_name ("ptrace"); | |
1764 | } | |
da6d8c04 DJ |
1765 | } |
1766 | ||
2bd7c093 PA |
1767 | struct thread_resume_array |
1768 | { | |
1769 | struct thread_resume *resume; | |
1770 | size_t n; | |
1771 | }; | |
64386c31 DJ |
1772 | |
1773 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1774 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1775 | resume request. | |
1776 | ||
1777 | This algorithm is O(threads * resume elements), but resume elements | |
1778 | is small (and will remain small at least until GDB supports thread | |
1779 | suspension). */ | |
2bd7c093 PA |
1780 | static int |
1781 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 1782 | { |
54a0b537 | 1783 | struct lwp_info *lwp; |
64386c31 | 1784 | struct thread_info *thread; |
5544ad89 | 1785 | int ndx; |
2bd7c093 | 1786 | struct thread_resume_array *r; |
64386c31 DJ |
1787 | |
1788 | thread = (struct thread_info *) entry; | |
54a0b537 | 1789 | lwp = get_thread_lwp (thread); |
2bd7c093 | 1790 | r = arg; |
64386c31 | 1791 | |
2bd7c093 | 1792 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
1793 | { |
1794 | ptid_t ptid = r->resume[ndx].thread; | |
1795 | if (ptid_equal (ptid, minus_one_ptid) | |
1796 | || ptid_equal (ptid, entry->id) | |
1797 | || (ptid_is_pid (ptid) | |
1798 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
1799 | || (ptid_get_lwp (ptid) == -1 | |
1800 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
1801 | { | |
1802 | lwp->resume = &r->resume[ndx]; | |
1803 | return 0; | |
1804 | } | |
1805 | } | |
2bd7c093 PA |
1806 | |
1807 | /* No resume action for this thread. */ | |
1808 | lwp->resume = NULL; | |
64386c31 | 1809 | |
2bd7c093 | 1810 | return 0; |
5544ad89 DJ |
1811 | } |
1812 | ||
5544ad89 | 1813 | |
bd99dc85 PA |
1814 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
1815 | static int | |
1816 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 1817 | { |
bd99dc85 | 1818 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 1819 | |
bd99dc85 PA |
1820 | /* LWPs which will not be resumed are not interesting, because |
1821 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 1822 | if (lwp->resume == NULL) |
bd99dc85 | 1823 | return 0; |
64386c31 | 1824 | |
bd99dc85 PA |
1825 | /* If this thread has a removed breakpoint, we won't have any |
1826 | events to report later, so check now. check_removed_breakpoint | |
1827 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1828 | for any thread that we are not otherwise going to resume - this | |
1829 | lets us preserve stopped status when two threads hit a breakpoint. | |
1830 | GDB removes the breakpoint to single-step a particular thread | |
1831 | past it, then re-inserts it and resumes all threads. We want | |
1832 | to report the second thread without resuming it in the interim. */ | |
1833 | if (lwp->status_pending_p) | |
1834 | check_removed_breakpoint (lwp); | |
5544ad89 | 1835 | |
bd99dc85 PA |
1836 | if (lwp->status_pending_p) |
1837 | * (int *) flag_p = 1; | |
c6ecbae5 | 1838 | |
bd99dc85 | 1839 | return 0; |
5544ad89 DJ |
1840 | } |
1841 | ||
1842 | /* This function is called once per thread. We check the thread's resume | |
1843 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 1844 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 1845 | |
bd99dc85 PA |
1846 | For threads which we aren't explicitly told otherwise, we preserve |
1847 | the stepping flag; this is used for stepping over gdbserver-placed | |
1848 | breakpoints. | |
1849 | ||
1850 | If pending_flags was set in any thread, we queue any needed | |
1851 | signals, since we won't actually resume. We already have a pending | |
1852 | event to report, so we don't need to preserve any step requests; | |
1853 | they should be re-issued if necessary. */ | |
1854 | ||
1855 | static int | |
1856 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 1857 | { |
54a0b537 | 1858 | struct lwp_info *lwp; |
5544ad89 | 1859 | struct thread_info *thread; |
bd99dc85 PA |
1860 | int step; |
1861 | int pending_flag = * (int *) arg; | |
5544ad89 DJ |
1862 | |
1863 | thread = (struct thread_info *) entry; | |
54a0b537 | 1864 | lwp = get_thread_lwp (thread); |
5544ad89 | 1865 | |
2bd7c093 | 1866 | if (lwp->resume == NULL) |
bd99dc85 | 1867 | return 0; |
5544ad89 | 1868 | |
bd99dc85 | 1869 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 1870 | { |
bd99dc85 PA |
1871 | if (debug_threads) |
1872 | fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp)); | |
1873 | ||
1874 | if (!lwp->stopped) | |
1875 | { | |
1876 | if (debug_threads) | |
95954743 | 1877 | fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
1878 | |
1879 | lwp->suspended = 1; | |
1880 | send_sigstop (&lwp->head); | |
1881 | } | |
1882 | else | |
1883 | { | |
1884 | if (debug_threads) | |
1885 | { | |
1886 | if (lwp->suspended) | |
1887 | fprintf (stderr, "already stopped/suspended LWP %ld\n", | |
1888 | lwpid_of (lwp)); | |
1889 | else | |
1890 | fprintf (stderr, "already stopped/not suspended LWP %ld\n", | |
1891 | lwpid_of (lwp)); | |
1892 | } | |
32ca6d61 | 1893 | |
bd99dc85 PA |
1894 | /* Make sure we leave the LWP suspended, so we don't try to |
1895 | resume it without GDB telling us to. FIXME: The LWP may | |
1896 | have been stopped in an internal event that was not meant | |
1897 | to be notified back to GDB (e.g., gdbserver breakpoint), | |
1898 | so we should be reporting a stop event in that case | |
1899 | too. */ | |
1900 | lwp->suspended = 1; | |
1901 | } | |
32ca6d61 | 1902 | |
bd99dc85 PA |
1903 | /* For stop requests, we're done. */ |
1904 | lwp->resume = NULL; | |
1905 | return 0; | |
5544ad89 | 1906 | } |
bd99dc85 PA |
1907 | else |
1908 | lwp->suspended = 0; | |
5544ad89 | 1909 | |
bd99dc85 PA |
1910 | /* If this thread which is about to be resumed has a pending status, |
1911 | then don't resume any threads - we can just report the pending | |
1912 | status. Make sure to queue any signals that would otherwise be | |
1913 | sent. In all-stop mode, we do this decision based on if *any* | |
1914 | thread has a pending status. */ | |
1915 | if (non_stop) | |
1916 | resume_status_pending_p (&lwp->head, &pending_flag); | |
5544ad89 | 1917 | |
bd99dc85 PA |
1918 | if (!pending_flag) |
1919 | { | |
1920 | if (debug_threads) | |
1921 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 1922 | |
95954743 | 1923 | if (ptid_equal (lwp->resume->thread, minus_one_ptid) |
bd99dc85 PA |
1924 | && lwp->stepping |
1925 | && lwp->pending_is_breakpoint) | |
1926 | step = 1; | |
1927 | else | |
1928 | step = (lwp->resume->kind == resume_step); | |
5544ad89 | 1929 | |
2acc282a | 1930 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
1931 | } |
1932 | else | |
1933 | { | |
1934 | if (debug_threads) | |
1935 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 1936 | |
bd99dc85 PA |
1937 | /* If we have a new signal, enqueue the signal. */ |
1938 | if (lwp->resume->sig != 0) | |
1939 | { | |
1940 | struct pending_signals *p_sig; | |
1941 | p_sig = xmalloc (sizeof (*p_sig)); | |
1942 | p_sig->prev = lwp->pending_signals; | |
1943 | p_sig->signal = lwp->resume->sig; | |
1944 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1945 | ||
1946 | /* If this is the same signal we were previously stopped by, | |
1947 | make sure to queue its siginfo. We can ignore the return | |
1948 | value of ptrace; if it fails, we'll skip | |
1949 | PTRACE_SETSIGINFO. */ | |
1950 | if (WIFSTOPPED (lwp->last_status) | |
1951 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
1952 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1953 | ||
1954 | lwp->pending_signals = p_sig; | |
1955 | } | |
1956 | } | |
5544ad89 | 1957 | |
bd99dc85 | 1958 | lwp->resume = NULL; |
5544ad89 | 1959 | return 0; |
0d62e5e8 DJ |
1960 | } |
1961 | ||
1962 | static void | |
2bd7c093 | 1963 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 1964 | { |
5544ad89 | 1965 | int pending_flag; |
2bd7c093 | 1966 | struct thread_resume_array array = { resume_info, n }; |
c6ecbae5 | 1967 | |
2bd7c093 | 1968 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 DJ |
1969 | |
1970 | /* If there is a thread which would otherwise be resumed, which | |
1971 | has a pending status, then don't resume any threads - we can just | |
1972 | report the pending status. Make sure to queue any signals | |
bd99dc85 PA |
1973 | that would otherwise be sent. In non-stop mode, we'll apply this |
1974 | logic to each thread individually. */ | |
5544ad89 | 1975 | pending_flag = 0; |
bd99dc85 PA |
1976 | if (!non_stop) |
1977 | find_inferior (&all_lwps, resume_status_pending_p, &pending_flag); | |
5544ad89 DJ |
1978 | |
1979 | if (debug_threads) | |
1980 | { | |
1981 | if (pending_flag) | |
1982 | fprintf (stderr, "Not resuming, pending status\n"); | |
1983 | else | |
1984 | fprintf (stderr, "Resuming, no pending status\n"); | |
1985 | } | |
1986 | ||
bd99dc85 | 1987 | find_inferior (&all_threads, linux_resume_one_thread, &pending_flag); |
0d62e5e8 DJ |
1988 | } |
1989 | ||
1990 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
1991 | |
1992 | int | |
0a30fbc4 | 1993 | register_addr (int regnum) |
da6d8c04 DJ |
1994 | { |
1995 | int addr; | |
1996 | ||
2ec06d2e | 1997 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
1998 | error ("Invalid register number %d.", regnum); |
1999 | ||
2ec06d2e | 2000 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2001 | |
2002 | return addr; | |
2003 | } | |
2004 | ||
58caa3dc | 2005 | /* Fetch one register. */ |
da6d8c04 DJ |
2006 | static void |
2007 | fetch_register (int regno) | |
2008 | { | |
2009 | CORE_ADDR regaddr; | |
48d93c75 | 2010 | int i, size; |
0d62e5e8 | 2011 | char *buf; |
95954743 | 2012 | int pid; |
da6d8c04 | 2013 | |
2ec06d2e | 2014 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2015 | return; |
2ec06d2e | 2016 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2017 | return; |
da6d8c04 | 2018 | |
0a30fbc4 DJ |
2019 | regaddr = register_addr (regno); |
2020 | if (regaddr == -1) | |
2021 | return; | |
95954743 PA |
2022 | |
2023 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2024 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2025 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2026 | buf = alloca (size); |
2027 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2028 | { |
2029 | errno = 0; | |
0d62e5e8 | 2030 | *(PTRACE_XFER_TYPE *) (buf + i) = |
95954743 | 2031 | ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
da6d8c04 DJ |
2032 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2033 | if (errno != 0) | |
2034 | { | |
2035 | /* Warning, not error, in case we are attached; sometimes the | |
2036 | kernel doesn't let us at the registers. */ | |
2037 | char *err = strerror (errno); | |
2038 | char *msg = alloca (strlen (err) + 128); | |
2039 | sprintf (msg, "reading register %d: %s", regno, err); | |
2040 | error (msg); | |
2041 | goto error_exit; | |
2042 | } | |
2043 | } | |
ee1a7ae4 UW |
2044 | |
2045 | if (the_low_target.supply_ptrace_register) | |
2046 | the_low_target.supply_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2047 | else |
2048 | supply_register (regno, buf); | |
0d62e5e8 | 2049 | |
da6d8c04 DJ |
2050 | error_exit:; |
2051 | } | |
2052 | ||
2053 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
2054 | static void |
2055 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 | 2056 | { |
4463ce24 | 2057 | if (regno == -1) |
2ec06d2e | 2058 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
2059 | fetch_register (regno); |
2060 | else | |
2061 | fetch_register (regno); | |
2062 | } | |
2063 | ||
2064 | /* Store our register values back into the inferior. | |
2065 | If REGNO is -1, do this for all registers. | |
2066 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
2067 | static void |
2068 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
2069 | { |
2070 | CORE_ADDR regaddr; | |
48d93c75 | 2071 | int i, size; |
0d62e5e8 | 2072 | char *buf; |
55ac2b99 | 2073 | int pid; |
da6d8c04 DJ |
2074 | |
2075 | if (regno >= 0) | |
2076 | { | |
2ec06d2e | 2077 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2078 | return; |
2079 | ||
bc1e36ca | 2080 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2081 | return; |
2082 | ||
2083 | regaddr = register_addr (regno); | |
2084 | if (regaddr == -1) | |
da6d8c04 | 2085 | return; |
da6d8c04 | 2086 | errno = 0; |
48d93c75 UW |
2087 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2088 | & - sizeof (PTRACE_XFER_TYPE); | |
2089 | buf = alloca (size); | |
2090 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2091 | |
2092 | if (the_low_target.collect_ptrace_register) | |
2093 | the_low_target.collect_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2094 | else |
2095 | collect_register (regno, buf); | |
ee1a7ae4 | 2096 | |
95954743 | 2097 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2098 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2099 | { |
0a30fbc4 | 2100 | errno = 0; |
95954743 | 2101 | ptrace (PTRACE_POKEUSER, pid, (PTRACE_ARG3_TYPE) regaddr, |
2ff29de4 | 2102 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
2103 | if (errno != 0) |
2104 | { | |
1b3f6016 PA |
2105 | /* At this point, ESRCH should mean the process is |
2106 | already gone, in which case we simply ignore attempts | |
2107 | to change its registers. See also the related | |
2108 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2109 | if (errno == ESRCH) |
2110 | return; | |
2111 | ||
bc1e36ca DJ |
2112 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
2113 | { | |
2114 | char *err = strerror (errno); | |
2115 | char *msg = alloca (strlen (err) + 128); | |
2116 | sprintf (msg, "writing register %d: %s", | |
2117 | regno, err); | |
2118 | error (msg); | |
2119 | return; | |
2120 | } | |
da6d8c04 | 2121 | } |
2ff29de4 | 2122 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2123 | } |
da6d8c04 DJ |
2124 | } |
2125 | else | |
2ec06d2e | 2126 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 2127 | usr_store_inferior_registers (regno); |
da6d8c04 | 2128 | } |
58caa3dc DJ |
2129 | #endif /* HAVE_LINUX_USRREGS */ |
2130 | ||
2131 | ||
2132 | ||
2133 | #ifdef HAVE_LINUX_REGSETS | |
2134 | ||
2135 | static int | |
0d62e5e8 | 2136 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
2137 | { |
2138 | struct regset_info *regset; | |
e9d25b98 | 2139 | int saw_general_regs = 0; |
95954743 | 2140 | int pid; |
58caa3dc DJ |
2141 | |
2142 | regset = target_regsets; | |
2143 | ||
95954743 | 2144 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2145 | while (regset->size >= 0) |
2146 | { | |
2147 | void *buf; | |
2148 | int res; | |
2149 | ||
52fa2412 | 2150 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2151 | { |
2152 | regset ++; | |
2153 | continue; | |
2154 | } | |
2155 | ||
bca929d3 | 2156 | buf = xmalloc (regset->size); |
dfb64f85 | 2157 | #ifndef __sparc__ |
95954743 | 2158 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2159 | #else |
95954743 | 2160 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2161 | #endif |
58caa3dc DJ |
2162 | if (res < 0) |
2163 | { | |
2164 | if (errno == EIO) | |
2165 | { | |
52fa2412 UW |
2166 | /* If we get EIO on a regset, do not try it again for |
2167 | this process. */ | |
2168 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2169 | free (buf); |
52fa2412 | 2170 | continue; |
58caa3dc DJ |
2171 | } |
2172 | else | |
2173 | { | |
0d62e5e8 | 2174 | char s[256]; |
95954743 PA |
2175 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
2176 | pid); | |
0d62e5e8 | 2177 | perror (s); |
58caa3dc DJ |
2178 | } |
2179 | } | |
e9d25b98 DJ |
2180 | else if (regset->type == GENERAL_REGS) |
2181 | saw_general_regs = 1; | |
58caa3dc DJ |
2182 | regset->store_function (buf); |
2183 | regset ++; | |
fdeb2a12 | 2184 | free (buf); |
58caa3dc | 2185 | } |
e9d25b98 DJ |
2186 | if (saw_general_regs) |
2187 | return 0; | |
2188 | else | |
2189 | return 1; | |
58caa3dc DJ |
2190 | } |
2191 | ||
2192 | static int | |
0d62e5e8 | 2193 | regsets_store_inferior_registers () |
58caa3dc DJ |
2194 | { |
2195 | struct regset_info *regset; | |
e9d25b98 | 2196 | int saw_general_regs = 0; |
95954743 | 2197 | int pid; |
58caa3dc DJ |
2198 | |
2199 | regset = target_regsets; | |
2200 | ||
95954743 | 2201 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2202 | while (regset->size >= 0) |
2203 | { | |
2204 | void *buf; | |
2205 | int res; | |
2206 | ||
52fa2412 | 2207 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2208 | { |
2209 | regset ++; | |
2210 | continue; | |
2211 | } | |
2212 | ||
bca929d3 | 2213 | buf = xmalloc (regset->size); |
545587ee DJ |
2214 | |
2215 | /* First fill the buffer with the current register set contents, | |
2216 | in case there are any items in the kernel's regset that are | |
2217 | not in gdbserver's regcache. */ | |
dfb64f85 | 2218 | #ifndef __sparc__ |
95954743 | 2219 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2220 | #else |
95954743 | 2221 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2222 | #endif |
545587ee DJ |
2223 | |
2224 | if (res == 0) | |
2225 | { | |
2226 | /* Then overlay our cached registers on that. */ | |
2227 | regset->fill_function (buf); | |
2228 | ||
2229 | /* Only now do we write the register set. */ | |
dfb64f85 | 2230 | #ifndef __sparc__ |
95954743 | 2231 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 2232 | #else |
95954743 | 2233 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 2234 | #endif |
545587ee DJ |
2235 | } |
2236 | ||
58caa3dc DJ |
2237 | if (res < 0) |
2238 | { | |
2239 | if (errno == EIO) | |
2240 | { | |
52fa2412 UW |
2241 | /* If we get EIO on a regset, do not try it again for |
2242 | this process. */ | |
2243 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2244 | free (buf); |
52fa2412 | 2245 | continue; |
58caa3dc | 2246 | } |
3221518c UW |
2247 | else if (errno == ESRCH) |
2248 | { | |
1b3f6016 PA |
2249 | /* At this point, ESRCH should mean the process is |
2250 | already gone, in which case we simply ignore attempts | |
2251 | to change its registers. See also the related | |
2252 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 2253 | free (buf); |
3221518c UW |
2254 | return 0; |
2255 | } | |
58caa3dc DJ |
2256 | else |
2257 | { | |
ce3a066d | 2258 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
2259 | } |
2260 | } | |
e9d25b98 DJ |
2261 | else if (regset->type == GENERAL_REGS) |
2262 | saw_general_regs = 1; | |
58caa3dc | 2263 | regset ++; |
09ec9b38 | 2264 | free (buf); |
58caa3dc | 2265 | } |
e9d25b98 DJ |
2266 | if (saw_general_regs) |
2267 | return 0; | |
2268 | else | |
2269 | return 1; | |
ce3a066d | 2270 | return 0; |
58caa3dc DJ |
2271 | } |
2272 | ||
2273 | #endif /* HAVE_LINUX_REGSETS */ | |
2274 | ||
2275 | ||
2276 | void | |
ce3a066d | 2277 | linux_fetch_registers (int regno) |
58caa3dc DJ |
2278 | { |
2279 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2280 | if (regsets_fetch_inferior_registers () == 0) |
2281 | return; | |
58caa3dc DJ |
2282 | #endif |
2283 | #ifdef HAVE_LINUX_USRREGS | |
2284 | usr_fetch_inferior_registers (regno); | |
2285 | #endif | |
2286 | } | |
2287 | ||
2288 | void | |
ce3a066d | 2289 | linux_store_registers (int regno) |
58caa3dc DJ |
2290 | { |
2291 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2292 | if (regsets_store_inferior_registers () == 0) |
2293 | return; | |
58caa3dc DJ |
2294 | #endif |
2295 | #ifdef HAVE_LINUX_USRREGS | |
2296 | usr_store_inferior_registers (regno); | |
2297 | #endif | |
2298 | } | |
2299 | ||
da6d8c04 | 2300 | |
da6d8c04 DJ |
2301 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
2302 | to debugger memory starting at MYADDR. */ | |
2303 | ||
c3e735a6 | 2304 | static int |
f450004a | 2305 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
2306 | { |
2307 | register int i; | |
2308 | /* Round starting address down to longword boundary. */ | |
2309 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2310 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
2311 | register int count |
2312 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
2313 | / sizeof (PTRACE_XFER_TYPE); |
2314 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 2315 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 2316 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
2317 | int fd; |
2318 | char filename[64]; | |
95954743 | 2319 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
2320 | |
2321 | /* Try using /proc. Don't bother for one word. */ | |
2322 | if (len >= 3 * sizeof (long)) | |
2323 | { | |
2324 | /* We could keep this file open and cache it - possibly one per | |
2325 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 2326 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
2327 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
2328 | if (fd == -1) | |
2329 | goto no_proc; | |
2330 | ||
2331 | /* If pread64 is available, use it. It's faster if the kernel | |
2332 | supports it (only one syscall), and it's 64-bit safe even on | |
2333 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
2334 | application). */ | |
2335 | #ifdef HAVE_PREAD64 | |
2336 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
2337 | #else | |
2338 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len) | |
2339 | #endif | |
2340 | { | |
2341 | close (fd); | |
2342 | goto no_proc; | |
2343 | } | |
2344 | ||
2345 | close (fd); | |
2346 | return 0; | |
2347 | } | |
da6d8c04 | 2348 | |
fd462a61 | 2349 | no_proc: |
da6d8c04 DJ |
2350 | /* Read all the longwords */ |
2351 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2352 | { | |
c3e735a6 | 2353 | errno = 0; |
95954743 | 2354 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
c3e735a6 DJ |
2355 | if (errno) |
2356 | return errno; | |
da6d8c04 DJ |
2357 | } |
2358 | ||
2359 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
2360 | memcpy (myaddr, |
2361 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
2362 | len); | |
c3e735a6 DJ |
2363 | |
2364 | return 0; | |
da6d8c04 DJ |
2365 | } |
2366 | ||
2367 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
2368 | to inferior's memory at MEMADDR. | |
2369 | On failure (cannot write the inferior) | |
2370 | returns the value of errno. */ | |
2371 | ||
ce3a066d | 2372 | static int |
f450004a | 2373 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
2374 | { |
2375 | register int i; | |
2376 | /* Round starting address down to longword boundary. */ | |
2377 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2378 | /* Round ending address up; get number of longwords that makes. */ | |
2379 | register int count | |
2380 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
2381 | /* Allocate buffer of that many longwords. */ | |
2382 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 2383 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 2384 | |
0d62e5e8 DJ |
2385 | if (debug_threads) |
2386 | { | |
2387 | fprintf (stderr, "Writing %02x to %08lx\n", (unsigned)myaddr[0], (long)memaddr); | |
2388 | } | |
2389 | ||
da6d8c04 DJ |
2390 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
2391 | ||
95954743 | 2392 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
da6d8c04 DJ |
2393 | |
2394 | if (count > 1) | |
2395 | { | |
2396 | buffer[count - 1] | |
95954743 | 2397 | = ptrace (PTRACE_PEEKTEXT, pid, |
d844cde6 DJ |
2398 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
2399 | * sizeof (PTRACE_XFER_TYPE)), | |
2400 | 0); | |
da6d8c04 DJ |
2401 | } |
2402 | ||
2403 | /* Copy data to be written over corresponding part of buffer */ | |
2404 | ||
2405 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
2406 | ||
2407 | /* Write the entire buffer. */ | |
2408 | ||
2409 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2410 | { | |
2411 | errno = 0; | |
95954743 | 2412 | ptrace (PTRACE_POKETEXT, pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
2413 | if (errno) |
2414 | return errno; | |
2415 | } | |
2416 | ||
2417 | return 0; | |
2418 | } | |
2f2893d9 | 2419 | |
24a09b5f DJ |
2420 | static int linux_supports_tracefork_flag; |
2421 | ||
51c2684e | 2422 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 2423 | |
51c2684e DJ |
2424 | static int |
2425 | linux_tracefork_grandchild (void *arg) | |
2426 | { | |
2427 | _exit (0); | |
2428 | } | |
2429 | ||
7407e2de AS |
2430 | #define STACK_SIZE 4096 |
2431 | ||
51c2684e DJ |
2432 | static int |
2433 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
2434 | { |
2435 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
2436 | kill (getpid (), SIGSTOP); | |
7407e2de AS |
2437 | #ifdef __ia64__ |
2438 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
2439 | CLONE_VM | SIGCHLD, NULL); | |
2440 | #else | |
2441 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
2442 | CLONE_VM | SIGCHLD, NULL); | |
2443 | #endif | |
24a09b5f DJ |
2444 | _exit (0); |
2445 | } | |
2446 | ||
bd99dc85 PA |
2447 | /* Wrapper function for waitpid which handles EINTR, and emulates |
2448 | __WALL for systems where that is not available. */ | |
24a09b5f DJ |
2449 | |
2450 | static int | |
2451 | my_waitpid (int pid, int *status, int flags) | |
2452 | { | |
bd99dc85 PA |
2453 | int ret, out_errno; |
2454 | ||
2455 | if (debug_threads) | |
2456 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
2457 | ||
2458 | if (flags & __WALL) | |
24a09b5f | 2459 | { |
bd99dc85 PA |
2460 | sigset_t block_mask, org_mask, wake_mask; |
2461 | int wnohang; | |
2462 | ||
2463 | wnohang = (flags & WNOHANG) != 0; | |
2464 | flags &= ~(__WALL | __WCLONE); | |
2465 | flags |= WNOHANG; | |
2466 | ||
2467 | /* Block all signals while here. This avoids knowing about | |
2468 | LinuxThread's signals. */ | |
2469 | sigfillset (&block_mask); | |
2470 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
2471 | ||
2472 | /* ... except during the sigsuspend below. */ | |
2473 | sigemptyset (&wake_mask); | |
2474 | ||
2475 | while (1) | |
2476 | { | |
2477 | /* Since all signals are blocked, there's no need to check | |
2478 | for EINTR here. */ | |
2479 | ret = waitpid (pid, status, flags); | |
2480 | out_errno = errno; | |
2481 | ||
2482 | if (ret == -1 && out_errno != ECHILD) | |
2483 | break; | |
2484 | else if (ret > 0) | |
2485 | break; | |
2486 | ||
2487 | if (flags & __WCLONE) | |
2488 | { | |
2489 | /* We've tried both flavors now. If WNOHANG is set, | |
2490 | there's nothing else to do, just bail out. */ | |
2491 | if (wnohang) | |
2492 | break; | |
2493 | ||
2494 | if (debug_threads) | |
2495 | fprintf (stderr, "blocking\n"); | |
2496 | ||
2497 | /* Block waiting for signals. */ | |
2498 | sigsuspend (&wake_mask); | |
2499 | } | |
2500 | ||
2501 | flags ^= __WCLONE; | |
2502 | } | |
2503 | ||
2504 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
24a09b5f | 2505 | } |
bd99dc85 PA |
2506 | else |
2507 | { | |
2508 | do | |
2509 | ret = waitpid (pid, status, flags); | |
2510 | while (ret == -1 && errno == EINTR); | |
2511 | out_errno = errno; | |
2512 | } | |
2513 | ||
2514 | if (debug_threads) | |
2515 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
2516 | pid, flags, status ? *status : -1, ret); | |
24a09b5f | 2517 | |
bd99dc85 | 2518 | errno = out_errno; |
24a09b5f DJ |
2519 | return ret; |
2520 | } | |
2521 | ||
2522 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make | |
2523 | sure that we can enable the option, and that it had the desired | |
2524 | effect. */ | |
2525 | ||
2526 | static void | |
2527 | linux_test_for_tracefork (void) | |
2528 | { | |
2529 | int child_pid, ret, status; | |
2530 | long second_pid; | |
bca929d3 | 2531 | char *stack = xmalloc (STACK_SIZE * 4); |
24a09b5f DJ |
2532 | |
2533 | linux_supports_tracefork_flag = 0; | |
2534 | ||
51c2684e | 2535 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
2536 | #ifdef __ia64__ |
2537 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
2538 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2539 | #else | |
2540 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, | |
2541 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2542 | #endif | |
24a09b5f | 2543 | if (child_pid == -1) |
51c2684e | 2544 | perror_with_name ("clone"); |
24a09b5f DJ |
2545 | |
2546 | ret = my_waitpid (child_pid, &status, 0); | |
2547 | if (ret == -1) | |
2548 | perror_with_name ("waitpid"); | |
2549 | else if (ret != child_pid) | |
2550 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
2551 | if (! WIFSTOPPED (status)) | |
2552 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
2553 | ||
2554 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); | |
2555 | if (ret != 0) | |
2556 | { | |
2557 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2558 | if (ret != 0) | |
2559 | { | |
2560 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2561 | return; | |
2562 | } | |
2563 | ||
2564 | ret = my_waitpid (child_pid, &status, 0); | |
2565 | if (ret != child_pid) | |
2566 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
2567 | else if (!WIFSIGNALED (status)) | |
2568 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
2569 | "killed child", status); | |
2570 | ||
2571 | return; | |
2572 | } | |
2573 | ||
2574 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
2575 | if (ret != 0) | |
2576 | warning ("linux_test_for_tracefork: failed to resume child"); | |
2577 | ||
2578 | ret = my_waitpid (child_pid, &status, 0); | |
2579 | ||
2580 | if (ret == child_pid && WIFSTOPPED (status) | |
2581 | && status >> 16 == PTRACE_EVENT_FORK) | |
2582 | { | |
2583 | second_pid = 0; | |
2584 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
2585 | if (ret == 0 && second_pid != 0) | |
2586 | { | |
2587 | int second_status; | |
2588 | ||
2589 | linux_supports_tracefork_flag = 1; | |
2590 | my_waitpid (second_pid, &second_status, 0); | |
2591 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
2592 | if (ret != 0) | |
2593 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
2594 | my_waitpid (second_pid, &status, 0); | |
2595 | } | |
2596 | } | |
2597 | else | |
2598 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
2599 | "(%d, status 0x%x)", ret, status); | |
2600 | ||
2601 | do | |
2602 | { | |
2603 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2604 | if (ret != 0) | |
2605 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2606 | my_waitpid (child_pid, &status, 0); | |
2607 | } | |
2608 | while (WIFSTOPPED (status)); | |
51c2684e DJ |
2609 | |
2610 | free (stack); | |
24a09b5f DJ |
2611 | } |
2612 | ||
2613 | ||
2f2893d9 DJ |
2614 | static void |
2615 | linux_look_up_symbols (void) | |
2616 | { | |
0d62e5e8 | 2617 | #ifdef USE_THREAD_DB |
95954743 PA |
2618 | struct process_info *proc = current_process (); |
2619 | ||
2620 | if (proc->private->thread_db_active) | |
0d62e5e8 DJ |
2621 | return; |
2622 | ||
95954743 PA |
2623 | proc->private->thread_db_active |
2624 | = thread_db_init (!linux_supports_tracefork_flag); | |
0d62e5e8 DJ |
2625 | #endif |
2626 | } | |
2627 | ||
e5379b03 | 2628 | static void |
ef57601b | 2629 | linux_request_interrupt (void) |
e5379b03 | 2630 | { |
a1928bad | 2631 | extern unsigned long signal_pid; |
e5379b03 | 2632 | |
95954743 PA |
2633 | if (!ptid_equal (cont_thread, null_ptid) |
2634 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 2635 | { |
54a0b537 | 2636 | struct lwp_info *lwp; |
bd99dc85 | 2637 | int lwpid; |
e5379b03 | 2638 | |
54a0b537 | 2639 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
2640 | lwpid = lwpid_of (lwp); |
2641 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
2642 | } |
2643 | else | |
ef57601b | 2644 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
2645 | } |
2646 | ||
aa691b87 RM |
2647 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
2648 | to debugger memory starting at MYADDR. */ | |
2649 | ||
2650 | static int | |
f450004a | 2651 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
2652 | { |
2653 | char filename[PATH_MAX]; | |
2654 | int fd, n; | |
95954743 | 2655 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 2656 | |
95954743 | 2657 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
2658 | |
2659 | fd = open (filename, O_RDONLY); | |
2660 | if (fd < 0) | |
2661 | return -1; | |
2662 | ||
2663 | if (offset != (CORE_ADDR) 0 | |
2664 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
2665 | n = -1; | |
2666 | else | |
2667 | n = read (fd, myaddr, len); | |
2668 | ||
2669 | close (fd); | |
2670 | ||
2671 | return n; | |
2672 | } | |
2673 | ||
e013ee27 OF |
2674 | /* These watchpoint related wrapper functions simply pass on the function call |
2675 | if the target has registered a corresponding function. */ | |
2676 | ||
2677 | static int | |
2678 | linux_insert_watchpoint (char type, CORE_ADDR addr, int len) | |
2679 | { | |
2680 | if (the_low_target.insert_watchpoint != NULL) | |
2681 | return the_low_target.insert_watchpoint (type, addr, len); | |
2682 | else | |
2683 | /* Unsupported (see target.h). */ | |
2684 | return 1; | |
2685 | } | |
2686 | ||
2687 | static int | |
2688 | linux_remove_watchpoint (char type, CORE_ADDR addr, int len) | |
2689 | { | |
2690 | if (the_low_target.remove_watchpoint != NULL) | |
2691 | return the_low_target.remove_watchpoint (type, addr, len); | |
2692 | else | |
2693 | /* Unsupported (see target.h). */ | |
2694 | return 1; | |
2695 | } | |
2696 | ||
2697 | static int | |
2698 | linux_stopped_by_watchpoint (void) | |
2699 | { | |
2700 | if (the_low_target.stopped_by_watchpoint != NULL) | |
2701 | return the_low_target.stopped_by_watchpoint (); | |
2702 | else | |
2703 | return 0; | |
2704 | } | |
2705 | ||
2706 | static CORE_ADDR | |
2707 | linux_stopped_data_address (void) | |
2708 | { | |
2709 | if (the_low_target.stopped_data_address != NULL) | |
2710 | return the_low_target.stopped_data_address (); | |
2711 | else | |
2712 | return 0; | |
2713 | } | |
2714 | ||
42c81e2a | 2715 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
2716 | #if defined(__mcoldfire__) |
2717 | /* These should really be defined in the kernel's ptrace.h header. */ | |
2718 | #define PT_TEXT_ADDR 49*4 | |
2719 | #define PT_DATA_ADDR 50*4 | |
2720 | #define PT_TEXT_END_ADDR 51*4 | |
2721 | #endif | |
2722 | ||
2723 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
2724 | to tell gdb about. */ | |
2725 | ||
2726 | static int | |
2727 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
2728 | { | |
2729 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
2730 | unsigned long text, text_end, data; | |
bd99dc85 | 2731 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
2732 | |
2733 | errno = 0; | |
2734 | ||
2735 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
2736 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
2737 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
2738 | ||
2739 | if (errno == 0) | |
2740 | { | |
2741 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
2742 | used by gdb) are relative to the beginning of the program, |
2743 | with the data segment immediately following the text segment. | |
2744 | However, the actual runtime layout in memory may put the data | |
2745 | somewhere else, so when we send gdb a data base-address, we | |
2746 | use the real data base address and subtract the compile-time | |
2747 | data base-address from it (which is just the length of the | |
2748 | text segment). BSS immediately follows data in both | |
2749 | cases. */ | |
52fb6437 NS |
2750 | *text_p = text; |
2751 | *data_p = data - (text_end - text); | |
1b3f6016 | 2752 | |
52fb6437 NS |
2753 | return 1; |
2754 | } | |
2755 | #endif | |
2756 | return 0; | |
2757 | } | |
2758 | #endif | |
2759 | ||
07e059b5 VP |
2760 | static int |
2761 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
2762 | unsigned char *readbuf, unsigned const char *writebuf, |
2763 | CORE_ADDR offset, int len) | |
07e059b5 VP |
2764 | { |
2765 | /* We make the process list snapshot when the object starts to be | |
2766 | read. */ | |
2767 | static const char *buf; | |
2768 | static long len_avail = -1; | |
2769 | static struct buffer buffer; | |
2770 | ||
2771 | DIR *dirp; | |
2772 | ||
2773 | if (strcmp (annex, "processes") != 0) | |
2774 | return 0; | |
2775 | ||
2776 | if (!readbuf || writebuf) | |
2777 | return 0; | |
2778 | ||
2779 | if (offset == 0) | |
2780 | { | |
2781 | if (len_avail != -1 && len_avail != 0) | |
2782 | buffer_free (&buffer); | |
2783 | len_avail = 0; | |
2784 | buf = NULL; | |
2785 | buffer_init (&buffer); | |
2786 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
2787 | ||
2788 | dirp = opendir ("/proc"); | |
2789 | if (dirp) | |
2790 | { | |
1b3f6016 PA |
2791 | struct dirent *dp; |
2792 | while ((dp = readdir (dirp)) != NULL) | |
2793 | { | |
2794 | struct stat statbuf; | |
2795 | char procentry[sizeof ("/proc/4294967295")]; | |
2796 | ||
2797 | if (!isdigit (dp->d_name[0]) | |
2798 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
2799 | continue; | |
2800 | ||
2801 | sprintf (procentry, "/proc/%s", dp->d_name); | |
2802 | if (stat (procentry, &statbuf) == 0 | |
2803 | && S_ISDIR (statbuf.st_mode)) | |
2804 | { | |
2805 | char pathname[128]; | |
2806 | FILE *f; | |
2807 | char cmd[MAXPATHLEN + 1]; | |
2808 | struct passwd *entry; | |
2809 | ||
2810 | sprintf (pathname, "/proc/%s/cmdline", dp->d_name); | |
2811 | entry = getpwuid (statbuf.st_uid); | |
2812 | ||
2813 | if ((f = fopen (pathname, "r")) != NULL) | |
2814 | { | |
2815 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
2816 | if (len > 0) | |
2817 | { | |
2818 | int i; | |
2819 | for (i = 0; i < len; i++) | |
2820 | if (cmd[i] == '\0') | |
2821 | cmd[i] = ' '; | |
2822 | cmd[len] = '\0'; | |
2823 | ||
2824 | buffer_xml_printf ( | |
07e059b5 VP |
2825 | &buffer, |
2826 | "<item>" | |
2827 | "<column name=\"pid\">%s</column>" | |
2828 | "<column name=\"user\">%s</column>" | |
2829 | "<column name=\"command\">%s</column>" | |
2830 | "</item>", | |
2831 | dp->d_name, | |
2832 | entry ? entry->pw_name : "?", | |
2833 | cmd); | |
1b3f6016 PA |
2834 | } |
2835 | fclose (f); | |
2836 | } | |
2837 | } | |
2838 | } | |
07e059b5 | 2839 | |
1b3f6016 | 2840 | closedir (dirp); |
07e059b5 VP |
2841 | } |
2842 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
2843 | buf = buffer_finish (&buffer); | |
2844 | len_avail = strlen (buf); | |
2845 | } | |
2846 | ||
2847 | if (offset >= len_avail) | |
2848 | { | |
2849 | /* Done. Get rid of the data. */ | |
2850 | buffer_free (&buffer); | |
2851 | buf = NULL; | |
2852 | len_avail = 0; | |
2853 | return 0; | |
2854 | } | |
2855 | ||
2856 | if (len > len_avail - offset) | |
2857 | len = len_avail - offset; | |
2858 | memcpy (readbuf, buf + offset, len); | |
2859 | ||
2860 | return len; | |
2861 | } | |
2862 | ||
d0722149 DE |
2863 | /* Convert a native/host siginfo object, into/from the siginfo in the |
2864 | layout of the inferiors' architecture. */ | |
2865 | ||
2866 | static void | |
2867 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
2868 | { | |
2869 | int done = 0; | |
2870 | ||
2871 | if (the_low_target.siginfo_fixup != NULL) | |
2872 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
2873 | ||
2874 | /* If there was no callback, or the callback didn't do anything, | |
2875 | then just do a straight memcpy. */ | |
2876 | if (!done) | |
2877 | { | |
2878 | if (direction == 1) | |
2879 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
2880 | else | |
2881 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
2882 | } | |
2883 | } | |
2884 | ||
4aa995e1 PA |
2885 | static int |
2886 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
2887 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
2888 | { | |
d0722149 | 2889 | int pid; |
4aa995e1 | 2890 | struct siginfo siginfo; |
d0722149 | 2891 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
2892 | |
2893 | if (current_inferior == NULL) | |
2894 | return -1; | |
2895 | ||
bd99dc85 | 2896 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
2897 | |
2898 | if (debug_threads) | |
d0722149 | 2899 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
2900 | readbuf != NULL ? "Reading" : "Writing", |
2901 | pid); | |
2902 | ||
2903 | if (offset > sizeof (siginfo)) | |
2904 | return -1; | |
2905 | ||
2906 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
2907 | return -1; | |
2908 | ||
d0722149 DE |
2909 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
2910 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
2911 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
2912 | with a 32-bit GDBSERVER, we need to convert it. */ | |
2913 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
2914 | ||
4aa995e1 PA |
2915 | if (offset + len > sizeof (siginfo)) |
2916 | len = sizeof (siginfo) - offset; | |
2917 | ||
2918 | if (readbuf != NULL) | |
d0722149 | 2919 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
2920 | else |
2921 | { | |
d0722149 DE |
2922 | memcpy (inf_siginfo + offset, writebuf, len); |
2923 | ||
2924 | /* Convert back to ptrace layout before flushing it out. */ | |
2925 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
2926 | ||
4aa995e1 PA |
2927 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
2928 | return -1; | |
2929 | } | |
2930 | ||
2931 | return len; | |
2932 | } | |
2933 | ||
bd99dc85 PA |
2934 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
2935 | so we notice when children change state; as the handler for the | |
2936 | sigsuspend in my_waitpid. */ | |
2937 | ||
2938 | static void | |
2939 | sigchld_handler (int signo) | |
2940 | { | |
2941 | int old_errno = errno; | |
2942 | ||
2943 | if (debug_threads) | |
2944 | /* fprintf is not async-signal-safe, so call write directly. */ | |
2945 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
2946 | ||
2947 | if (target_is_async_p ()) | |
2948 | async_file_mark (); /* trigger a linux_wait */ | |
2949 | ||
2950 | errno = old_errno; | |
2951 | } | |
2952 | ||
2953 | static int | |
2954 | linux_supports_non_stop (void) | |
2955 | { | |
2956 | return 1; | |
2957 | } | |
2958 | ||
2959 | static int | |
2960 | linux_async (int enable) | |
2961 | { | |
2962 | int previous = (linux_event_pipe[0] != -1); | |
2963 | ||
2964 | if (previous != enable) | |
2965 | { | |
2966 | sigset_t mask; | |
2967 | sigemptyset (&mask); | |
2968 | sigaddset (&mask, SIGCHLD); | |
2969 | ||
2970 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
2971 | ||
2972 | if (enable) | |
2973 | { | |
2974 | if (pipe (linux_event_pipe) == -1) | |
2975 | fatal ("creating event pipe failed."); | |
2976 | ||
2977 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
2978 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
2979 | ||
2980 | /* Register the event loop handler. */ | |
2981 | add_file_handler (linux_event_pipe[0], | |
2982 | handle_target_event, NULL); | |
2983 | ||
2984 | /* Always trigger a linux_wait. */ | |
2985 | async_file_mark (); | |
2986 | } | |
2987 | else | |
2988 | { | |
2989 | delete_file_handler (linux_event_pipe[0]); | |
2990 | ||
2991 | close (linux_event_pipe[0]); | |
2992 | close (linux_event_pipe[1]); | |
2993 | linux_event_pipe[0] = -1; | |
2994 | linux_event_pipe[1] = -1; | |
2995 | } | |
2996 | ||
2997 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
2998 | } | |
2999 | ||
3000 | return previous; | |
3001 | } | |
3002 | ||
3003 | static int | |
3004 | linux_start_non_stop (int nonstop) | |
3005 | { | |
3006 | /* Register or unregister from event-loop accordingly. */ | |
3007 | linux_async (nonstop); | |
3008 | return 0; | |
3009 | } | |
3010 | ||
cf8fd78b PA |
3011 | static int |
3012 | linux_supports_multi_process (void) | |
3013 | { | |
3014 | return 1; | |
3015 | } | |
3016 | ||
ce3a066d DJ |
3017 | static struct target_ops linux_target_ops = { |
3018 | linux_create_inferior, | |
3019 | linux_attach, | |
3020 | linux_kill, | |
6ad8ae5c | 3021 | linux_detach, |
444d6139 | 3022 | linux_join, |
ce3a066d DJ |
3023 | linux_thread_alive, |
3024 | linux_resume, | |
3025 | linux_wait, | |
3026 | linux_fetch_registers, | |
3027 | linux_store_registers, | |
3028 | linux_read_memory, | |
3029 | linux_write_memory, | |
2f2893d9 | 3030 | linux_look_up_symbols, |
ef57601b | 3031 | linux_request_interrupt, |
aa691b87 | 3032 | linux_read_auxv, |
e013ee27 OF |
3033 | linux_insert_watchpoint, |
3034 | linux_remove_watchpoint, | |
3035 | linux_stopped_by_watchpoint, | |
3036 | linux_stopped_data_address, | |
42c81e2a | 3037 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 3038 | linux_read_offsets, |
dae5f5cf DJ |
3039 | #else |
3040 | NULL, | |
3041 | #endif | |
3042 | #ifdef USE_THREAD_DB | |
3043 | thread_db_get_tls_address, | |
3044 | #else | |
3045 | NULL, | |
52fb6437 | 3046 | #endif |
59a016f0 PA |
3047 | NULL, |
3048 | hostio_last_error_from_errno, | |
07e059b5 | 3049 | linux_qxfer_osdata, |
4aa995e1 | 3050 | linux_xfer_siginfo, |
bd99dc85 PA |
3051 | linux_supports_non_stop, |
3052 | linux_async, | |
3053 | linux_start_non_stop, | |
cf8fd78b | 3054 | linux_supports_multi_process |
ce3a066d DJ |
3055 | }; |
3056 | ||
0d62e5e8 DJ |
3057 | static void |
3058 | linux_init_signals () | |
3059 | { | |
3060 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
3061 | to find what the cancel signal actually is. */ | |
254787d4 | 3062 | signal (__SIGRTMIN+1, SIG_IGN); |
0d62e5e8 DJ |
3063 | } |
3064 | ||
da6d8c04 DJ |
3065 | void |
3066 | initialize_low (void) | |
3067 | { | |
bd99dc85 PA |
3068 | struct sigaction sigchld_action; |
3069 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 3070 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
3071 | set_breakpoint_data (the_low_target.breakpoint, |
3072 | the_low_target.breakpoint_len); | |
0d62e5e8 | 3073 | linux_init_signals (); |
24a09b5f | 3074 | linux_test_for_tracefork (); |
52fa2412 UW |
3075 | #ifdef HAVE_LINUX_REGSETS |
3076 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
3077 | ; | |
bca929d3 | 3078 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 3079 | #endif |
bd99dc85 PA |
3080 | |
3081 | sigchld_action.sa_handler = sigchld_handler; | |
3082 | sigemptyset (&sigchld_action.sa_mask); | |
3083 | sigchld_action.sa_flags = SA_RESTART; | |
3084 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 3085 | } |