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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 | ||
54a0b537 PA |
124 | static void linux_resume_one_lwp (struct inferior_list_entry *entry, |
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 | |
da5898ce DJ |
298 | /* Normally we will get the pending SIGSTOP. But in some cases |
299 | we might get another signal delivered to the group first. | |
f21cc1a2 | 300 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
301 | if (WSTOPSIG (status) == SIGSTOP) |
302 | { | |
303 | if (stopping_threads) | |
54a0b537 | 304 | new_lwp->stopped = 1; |
da5898ce DJ |
305 | else |
306 | ptrace (PTRACE_CONT, new_pid, 0, 0); | |
307 | } | |
24a09b5f | 308 | else |
da5898ce | 309 | { |
54a0b537 | 310 | new_lwp->stop_expected = 1; |
da5898ce DJ |
311 | if (stopping_threads) |
312 | { | |
54a0b537 PA |
313 | new_lwp->stopped = 1; |
314 | new_lwp->status_pending_p = 1; | |
315 | new_lwp->status_pending = status; | |
da5898ce DJ |
316 | } |
317 | else | |
318 | /* Pass the signal on. This is what GDB does - except | |
319 | shouldn't we really report it instead? */ | |
320 | ptrace (PTRACE_CONT, new_pid, 0, WSTOPSIG (status)); | |
321 | } | |
24a09b5f DJ |
322 | |
323 | /* Always resume the current thread. If we are stopping | |
324 | threads, it will have a pending SIGSTOP; we may as well | |
325 | collect it now. */ | |
54a0b537 PA |
326 | linux_resume_one_lwp (&event_child->head, |
327 | event_child->stepping, 0, NULL); | |
24a09b5f DJ |
328 | } |
329 | } | |
330 | ||
0d62e5e8 DJ |
331 | /* This function should only be called if the process got a SIGTRAP. |
332 | The SIGTRAP could mean several things. | |
333 | ||
334 | On i386, where decr_pc_after_break is non-zero: | |
335 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
336 | we will get only the one SIGTRAP (even if the instruction we | |
337 | stepped over was a breakpoint). The value of $eip will be the | |
338 | next instruction. | |
339 | If we continue the process using PTRACE_CONT, we will get a | |
340 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
341 | the instruction after the breakpoint (i.e. needs to be | |
342 | decremented). If we report the SIGTRAP to GDB, we must also | |
343 | report the undecremented PC. If we cancel the SIGTRAP, we | |
344 | must resume at the decremented PC. | |
345 | ||
346 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
347 | with hardware or kernel single-step: | |
348 | If we single-step over a breakpoint instruction, our PC will | |
349 | point at the following instruction. If we continue and hit a | |
350 | breakpoint instruction, our PC will point at the breakpoint | |
351 | instruction. */ | |
352 | ||
353 | static CORE_ADDR | |
354 | get_stop_pc (void) | |
355 | { | |
356 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); | |
357 | ||
54a0b537 | 358 | if (get_thread_lwp (current_inferior)->stepping) |
0d62e5e8 DJ |
359 | return stop_pc; |
360 | else | |
361 | return stop_pc - the_low_target.decr_pc_after_break; | |
362 | } | |
ce3a066d | 363 | |
0d62e5e8 | 364 | static void * |
95954743 | 365 | add_lwp (ptid_t ptid) |
611cb4a5 | 366 | { |
54a0b537 | 367 | struct lwp_info *lwp; |
0d62e5e8 | 368 | |
54a0b537 PA |
369 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
370 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 371 | |
95954743 | 372 | lwp->head.id = ptid; |
0d62e5e8 | 373 | |
54a0b537 | 374 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 375 | |
54a0b537 | 376 | return lwp; |
0d62e5e8 | 377 | } |
611cb4a5 | 378 | |
da6d8c04 DJ |
379 | /* Start an inferior process and returns its pid. |
380 | ALLARGS is a vector of program-name and args. */ | |
381 | ||
ce3a066d DJ |
382 | static int |
383 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 384 | { |
a6dbe5df | 385 | struct lwp_info *new_lwp; |
da6d8c04 | 386 | int pid; |
95954743 | 387 | ptid_t ptid; |
da6d8c04 | 388 | |
42c81e2a | 389 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
390 | pid = vfork (); |
391 | #else | |
da6d8c04 | 392 | pid = fork (); |
52fb6437 | 393 | #endif |
da6d8c04 DJ |
394 | if (pid < 0) |
395 | perror_with_name ("fork"); | |
396 | ||
397 | if (pid == 0) | |
398 | { | |
399 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
400 | ||
254787d4 | 401 | signal (__SIGRTMIN + 1, SIG_DFL); |
0d62e5e8 | 402 | |
a9fa9f7d DJ |
403 | setpgid (0, 0); |
404 | ||
2b876972 DJ |
405 | execv (program, allargs); |
406 | if (errno == ENOENT) | |
407 | execvp (program, allargs); | |
da6d8c04 DJ |
408 | |
409 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 410 | strerror (errno)); |
da6d8c04 DJ |
411 | fflush (stderr); |
412 | _exit (0177); | |
413 | } | |
414 | ||
95954743 PA |
415 | linux_add_process (pid, 0); |
416 | ||
417 | ptid = ptid_build (pid, pid, 0); | |
418 | new_lwp = add_lwp (ptid); | |
419 | add_thread (ptid, new_lwp); | |
a6dbe5df | 420 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 421 | |
a9fa9f7d | 422 | return pid; |
da6d8c04 DJ |
423 | } |
424 | ||
425 | /* Attach to an inferior process. */ | |
426 | ||
95954743 PA |
427 | static void |
428 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 429 | { |
95954743 | 430 | ptid_t ptid; |
54a0b537 | 431 | struct lwp_info *new_lwp; |
611cb4a5 | 432 | |
95954743 | 433 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 434 | { |
95954743 | 435 | if (!initial) |
2d717e4f DJ |
436 | { |
437 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 438 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
439 | strerror (errno), errno); |
440 | fflush (stderr); | |
441 | return; | |
442 | } | |
443 | else | |
444 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 445 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 446 | strerror (errno), errno); |
da6d8c04 DJ |
447 | } |
448 | ||
95954743 PA |
449 | if (initial) |
450 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
451 | ptid = ptid_build (lwpid, lwpid, 0); | |
452 | else | |
453 | { | |
454 | /* Note that extracting the pid from the current inferior is | |
455 | safe, since we're always called in the context of the same | |
456 | process as this new thread. */ | |
457 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
458 | ptid = ptid_build (pid, lwpid, 0); | |
459 | } | |
24a09b5f | 460 | |
95954743 PA |
461 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
462 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 463 | |
a6dbe5df PA |
464 | |
465 | /* We need to wait for SIGSTOP before being able to make the next | |
466 | ptrace call on this LWP. */ | |
467 | new_lwp->must_set_ptrace_flags = 1; | |
468 | ||
0d62e5e8 | 469 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
470 | brings it to a halt. |
471 | ||
472 | There are several cases to consider here: | |
473 | ||
474 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 PA |
475 | of a new thread that is being created. |
476 | In this case we should ignore that SIGSTOP and resume the process. | |
477 | This is handled below by setting stop_expected = 1. | |
0e21c1ec DE |
478 | |
479 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
480 | to it via attach_inferior. |
481 | In this case we want the process thread to stop. | |
482 | This is handled by having linux_attach clear stop_expected after | |
483 | we return. | |
484 | ??? If the process already has several threads we leave the other | |
485 | threads running. | |
0e21c1ec DE |
486 | |
487 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
488 | existing threads. |
489 | In this case we want the thread to stop. | |
490 | FIXME: This case is currently not properly handled. | |
491 | We should wait for the SIGSTOP but don't. Things work apparently | |
492 | because enough time passes between when we ptrace (ATTACH) and when | |
493 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
494 | |
495 | On the other hand, if we are currently trying to stop all threads, we | |
496 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 497 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
498 | end of the list, and so the new thread has not yet reached |
499 | wait_for_sigstop (but will). */ | |
0d62e5e8 | 500 | if (! stopping_threads) |
54a0b537 | 501 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
502 | } |
503 | ||
95954743 PA |
504 | void |
505 | linux_attach_lwp (unsigned long lwpid) | |
506 | { | |
507 | linux_attach_lwp_1 (lwpid, 0); | |
508 | } | |
509 | ||
0d62e5e8 | 510 | int |
a1928bad | 511 | linux_attach (unsigned long pid) |
0d62e5e8 | 512 | { |
54a0b537 | 513 | struct lwp_info *lwp; |
0d62e5e8 | 514 | |
95954743 PA |
515 | linux_attach_lwp_1 (pid, 1); |
516 | ||
517 | linux_add_process (pid, 1); | |
0d62e5e8 | 518 | |
bd99dc85 PA |
519 | if (!non_stop) |
520 | { | |
521 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
522 | process. It will be collected by wait shortly. */ | |
95954743 PA |
523 | lwp = (struct lwp_info *) find_inferior_id (&all_lwps, |
524 | ptid_build (pid, pid, 0)); | |
bd99dc85 PA |
525 | lwp->stop_expected = 0; |
526 | } | |
0d62e5e8 | 527 | |
95954743 PA |
528 | return 0; |
529 | } | |
530 | ||
531 | struct counter | |
532 | { | |
533 | int pid; | |
534 | int count; | |
535 | }; | |
536 | ||
537 | static int | |
538 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
539 | { | |
540 | struct counter *counter = args; | |
541 | ||
542 | if (ptid_get_pid (entry->id) == counter->pid) | |
543 | { | |
544 | if (++counter->count > 1) | |
545 | return 1; | |
546 | } | |
d61ddec4 | 547 | |
da6d8c04 DJ |
548 | return 0; |
549 | } | |
550 | ||
95954743 PA |
551 | static int |
552 | last_thread_of_process_p (struct thread_info *thread) | |
553 | { | |
554 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
555 | int pid = ptid_get_pid (ptid); | |
556 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 557 | |
95954743 PA |
558 | return (find_inferior (&all_threads, |
559 | second_thread_of_pid_p, &counter) == NULL); | |
560 | } | |
561 | ||
562 | /* Kill the inferior lwp. */ | |
563 | ||
564 | static int | |
565 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 566 | { |
0d62e5e8 | 567 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 568 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 569 | int wstat; |
95954743 PA |
570 | int pid = * (int *) args; |
571 | ||
572 | if (ptid_get_pid (entry->id) != pid) | |
573 | return 0; | |
0d62e5e8 | 574 | |
fd500816 DJ |
575 | /* We avoid killing the first thread here, because of a Linux kernel (at |
576 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
577 | the children get a chance to be reaped, it will remain a zombie | |
578 | forever. */ | |
95954743 PA |
579 | |
580 | if (last_thread_of_process_p (thread)) | |
581 | { | |
582 | if (debug_threads) | |
583 | fprintf (stderr, "lkop: is last of process %s\n", | |
584 | target_pid_to_str (entry->id)); | |
585 | return 0; | |
586 | } | |
fd500816 | 587 | |
bd99dc85 PA |
588 | /* If we're killing a running inferior, make sure it is stopped |
589 | first, as PTRACE_KILL will not work otherwise. */ | |
590 | if (!lwp->stopped) | |
591 | send_sigstop (&lwp->head); | |
592 | ||
0d62e5e8 DJ |
593 | do |
594 | { | |
bd99dc85 | 595 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
596 | |
597 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 598 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 599 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
600 | |
601 | return 0; | |
da6d8c04 DJ |
602 | } |
603 | ||
95954743 PA |
604 | static int |
605 | linux_kill (int pid) | |
0d62e5e8 | 606 | { |
95954743 | 607 | struct process_info *process; |
54a0b537 | 608 | struct lwp_info *lwp; |
95954743 | 609 | struct thread_info *thread; |
fd500816 | 610 | int wstat; |
95954743 | 611 | int lwpid; |
fd500816 | 612 | |
95954743 PA |
613 | process = find_process_pid (pid); |
614 | if (process == NULL) | |
615 | return -1; | |
9d606399 | 616 | |
95954743 | 617 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 618 | |
54a0b537 | 619 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 620 | thread in the list, so do so now. */ |
95954743 PA |
621 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
622 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
623 | |
624 | if (debug_threads) | |
95954743 PA |
625 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
626 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
627 | |
628 | /* If we're killing a running inferior, make sure it is stopped | |
629 | first, as PTRACE_KILL will not work otherwise. */ | |
630 | if (!lwp->stopped) | |
631 | send_sigstop (&lwp->head); | |
632 | ||
fd500816 DJ |
633 | do |
634 | { | |
bd99dc85 | 635 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
636 | |
637 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
638 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
639 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 640 | |
bd99dc85 | 641 | delete_lwp (lwp); |
5091eb23 | 642 | linux_remove_process (process); |
95954743 | 643 | return 0; |
0d62e5e8 DJ |
644 | } |
645 | ||
95954743 PA |
646 | static int |
647 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
648 | { |
649 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 650 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
651 | int pid = * (int *) args; |
652 | ||
653 | if (ptid_get_pid (entry->id) != pid) | |
654 | return 0; | |
6ad8ae5c | 655 | |
bd99dc85 PA |
656 | /* If we're detaching from a running inferior, make sure it is |
657 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
658 | if (!lwp->stopped) | |
659 | { | |
95954743 | 660 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
661 | |
662 | stopping_threads = 1; | |
663 | send_sigstop (&lwp->head); | |
664 | ||
665 | /* If this detects a new thread through a clone event, the new | |
666 | thread is appended to the end of the lwp list, so we'll | |
667 | eventually detach from it. */ | |
668 | wait_for_sigstop (&lwp->head); | |
669 | stopping_threads = 0; | |
670 | ||
671 | /* If LWP exits while we're trying to stop it, there's nothing | |
672 | left to do. */ | |
95954743 | 673 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 674 | if (lwp == NULL) |
95954743 | 675 | return 0; |
bd99dc85 PA |
676 | } |
677 | ||
ae13219e DJ |
678 | /* Make sure the process isn't stopped at a breakpoint that's |
679 | no longer there. */ | |
54a0b537 | 680 | check_removed_breakpoint (lwp); |
ae13219e DJ |
681 | |
682 | /* If this process is stopped but is expecting a SIGSTOP, then make | |
683 | sure we take care of that now. This isn't absolutely guaranteed | |
684 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 685 | if (lwp->stop_expected) |
ae13219e | 686 | { |
bd99dc85 | 687 | int wstat; |
ae13219e | 688 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
689 | lwp->stop_expected = 0; |
690 | if (lwp->stopped) | |
691 | linux_resume_one_lwp (&lwp->head, 0, 0, NULL); | |
95954743 | 692 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
693 | } |
694 | ||
695 | /* Flush any pending changes to the process's registers. */ | |
696 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 697 | get_lwp_thread (lwp)); |
ae13219e DJ |
698 | |
699 | /* Finally, let it resume. */ | |
bd99dc85 PA |
700 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
701 | ||
702 | delete_lwp (lwp); | |
95954743 | 703 | return 0; |
6ad8ae5c DJ |
704 | } |
705 | ||
dd6953e1 | 706 | static int |
95954743 | 707 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 708 | { |
95954743 PA |
709 | int *pid_p = args; |
710 | ||
711 | if (ptid_get_pid (entry->id) == *pid_p) | |
712 | return 1; | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
717 | static int | |
718 | linux_detach (int pid) | |
719 | { | |
720 | struct process_info *process; | |
721 | ||
722 | process = find_process_pid (pid); | |
723 | if (process == NULL) | |
724 | return -1; | |
725 | ||
726 | current_inferior = | |
727 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
728 | ||
ae13219e | 729 | delete_all_breakpoints (); |
95954743 | 730 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
5091eb23 | 731 | linux_remove_process (process); |
dd6953e1 | 732 | return 0; |
6ad8ae5c DJ |
733 | } |
734 | ||
444d6139 | 735 | static void |
95954743 | 736 | linux_join (int pid) |
444d6139 | 737 | { |
444d6139 | 738 | int status, ret; |
95954743 | 739 | struct process_info *process; |
bd99dc85 | 740 | |
95954743 PA |
741 | process = find_process_pid (pid); |
742 | if (process == NULL) | |
743 | return; | |
444d6139 PA |
744 | |
745 | do { | |
95954743 | 746 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
747 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
748 | break; | |
749 | } while (ret != -1 || errno != ECHILD); | |
750 | } | |
751 | ||
6ad8ae5c | 752 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 753 | static int |
95954743 | 754 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 755 | { |
95954743 PA |
756 | struct lwp_info *lwp = find_lwp_pid (ptid); |
757 | ||
758 | /* We assume we always know if a thread exits. If a whole process | |
759 | exited but we still haven't been able to report it to GDB, we'll | |
760 | hold on to the last lwp of the dead process. */ | |
761 | if (lwp != NULL) | |
762 | return !lwp->dead; | |
0d62e5e8 DJ |
763 | else |
764 | return 0; | |
765 | } | |
766 | ||
767 | /* Return nonzero if this process stopped at a breakpoint which | |
768 | no longer appears to be inserted. Also adjust the PC | |
769 | appropriately to resume where the breakpoint used to be. */ | |
ce3a066d | 770 | static int |
54a0b537 | 771 | check_removed_breakpoint (struct lwp_info *event_child) |
da6d8c04 | 772 | { |
0d62e5e8 DJ |
773 | CORE_ADDR stop_pc; |
774 | struct thread_info *saved_inferior; | |
775 | ||
776 | if (event_child->pending_is_breakpoint == 0) | |
777 | return 0; | |
778 | ||
779 | if (debug_threads) | |
54a0b537 | 780 | fprintf (stderr, "Checking for breakpoint in lwp %ld.\n", |
bd99dc85 | 781 | lwpid_of (event_child)); |
0d62e5e8 DJ |
782 | |
783 | saved_inferior = current_inferior; | |
54a0b537 | 784 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 DJ |
785 | |
786 | stop_pc = get_stop_pc (); | |
787 | ||
788 | /* If the PC has changed since we stopped, then we shouldn't do | |
789 | anything. This happens if, for instance, GDB handled the | |
790 | decr_pc_after_break subtraction itself. */ | |
791 | if (stop_pc != event_child->pending_stop_pc) | |
792 | { | |
793 | if (debug_threads) | |
ae13219e DJ |
794 | fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
795 | event_child->pending_stop_pc); | |
0d62e5e8 DJ |
796 | |
797 | event_child->pending_is_breakpoint = 0; | |
798 | current_inferior = saved_inferior; | |
799 | return 0; | |
800 | } | |
801 | ||
802 | /* If the breakpoint is still there, we will report hitting it. */ | |
803 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
804 | { | |
805 | if (debug_threads) | |
806 | fprintf (stderr, "Ignoring, breakpoint is still present.\n"); | |
807 | current_inferior = saved_inferior; | |
808 | return 0; | |
809 | } | |
810 | ||
811 | if (debug_threads) | |
812 | fprintf (stderr, "Removed breakpoint.\n"); | |
813 | ||
814 | /* For decr_pc_after_break targets, here is where we perform the | |
815 | decrement. We go immediately from this function to resuming, | |
816 | and can not safely call get_stop_pc () again. */ | |
817 | if (the_low_target.set_pc != NULL) | |
818 | (*the_low_target.set_pc) (stop_pc); | |
819 | ||
820 | /* We consumed the pending SIGTRAP. */ | |
5544ad89 | 821 | event_child->pending_is_breakpoint = 0; |
0d62e5e8 DJ |
822 | event_child->status_pending_p = 0; |
823 | event_child->status_pending = 0; | |
824 | ||
825 | current_inferior = saved_inferior; | |
da6d8c04 DJ |
826 | return 1; |
827 | } | |
828 | ||
54a0b537 PA |
829 | /* Return 1 if this lwp has an interesting status pending. This |
830 | function may silently resume an inferior lwp. */ | |
611cb4a5 | 831 | static int |
95954743 | 832 | status_pending_p (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 833 | { |
54a0b537 | 834 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 PA |
835 | ptid_t ptid = * (ptid_t *) arg; |
836 | ||
837 | /* Check if we're only interested in events from a specific process | |
838 | or its lwps. */ | |
839 | if (!ptid_equal (minus_one_ptid, ptid) | |
840 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
841 | return 0; | |
0d62e5e8 | 842 | |
bd99dc85 | 843 | if (lwp->status_pending_p && !lwp->suspended) |
54a0b537 | 844 | if (check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
845 | { |
846 | /* This thread was stopped at a breakpoint, and the breakpoint | |
847 | is now gone. We were told to continue (or step...) all threads, | |
848 | so GDB isn't trying to single-step past this breakpoint. | |
849 | So instead of reporting the old SIGTRAP, pretend we got to | |
850 | the breakpoint just after it was removed instead of just | |
851 | before; resume the process. */ | |
54a0b537 | 852 | linux_resume_one_lwp (&lwp->head, 0, 0, NULL); |
0d62e5e8 DJ |
853 | return 0; |
854 | } | |
855 | ||
bd99dc85 | 856 | return (lwp->status_pending_p && !lwp->suspended); |
0d62e5e8 DJ |
857 | } |
858 | ||
95954743 PA |
859 | static int |
860 | same_lwp (struct inferior_list_entry *entry, void *data) | |
861 | { | |
862 | ptid_t ptid = *(ptid_t *) data; | |
863 | int lwp; | |
864 | ||
865 | if (ptid_get_lwp (ptid) != 0) | |
866 | lwp = ptid_get_lwp (ptid); | |
867 | else | |
868 | lwp = ptid_get_pid (ptid); | |
869 | ||
870 | if (ptid_get_lwp (entry->id) == lwp) | |
871 | return 1; | |
872 | ||
873 | return 0; | |
874 | } | |
875 | ||
876 | struct lwp_info * | |
877 | find_lwp_pid (ptid_t ptid) | |
878 | { | |
879 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
880 | } | |
881 | ||
bd99dc85 | 882 | static struct lwp_info * |
95954743 | 883 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 884 | { |
0d62e5e8 | 885 | int ret; |
95954743 | 886 | int to_wait_for = -1; |
bd99dc85 | 887 | struct lwp_info *child = NULL; |
0d62e5e8 | 888 | |
bd99dc85 | 889 | if (debug_threads) |
95954743 PA |
890 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
891 | ||
892 | if (ptid_equal (ptid, minus_one_ptid)) | |
893 | to_wait_for = -1; /* any child */ | |
894 | else | |
895 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 896 | |
bd99dc85 | 897 | options |= __WALL; |
0d62e5e8 | 898 | |
bd99dc85 | 899 | retry: |
0d62e5e8 | 900 | |
bd99dc85 PA |
901 | ret = my_waitpid (to_wait_for, wstatp, options); |
902 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
903 | return NULL; | |
904 | else if (ret == -1) | |
905 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
906 | |
907 | if (debug_threads | |
908 | && (!WIFSTOPPED (*wstatp) | |
909 | || (WSTOPSIG (*wstatp) != 32 | |
910 | && WSTOPSIG (*wstatp) != 33))) | |
911 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
912 | ||
95954743 | 913 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 914 | |
24a09b5f DJ |
915 | /* If we didn't find a process, one of two things presumably happened: |
916 | - A process we started and then detached from has exited. Ignore it. | |
917 | - A process we are controlling has forked and the new child's stop | |
918 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 919 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
920 | { |
921 | add_pid_to_list (&stopped_pids, ret); | |
922 | goto retry; | |
923 | } | |
bd99dc85 | 924 | else if (child == NULL) |
24a09b5f DJ |
925 | goto retry; |
926 | ||
bd99dc85 PA |
927 | child->stopped = 1; |
928 | child->pending_is_breakpoint = 0; | |
0d62e5e8 | 929 | |
bd99dc85 | 930 | child->last_status = *wstatp; |
32ca6d61 | 931 | |
d61ddec4 UW |
932 | /* Architecture-specific setup after inferior is running. |
933 | This needs to happen after we have attached to the inferior | |
934 | and it is stopped for the first time, but before we access | |
935 | any inferior registers. */ | |
936 | if (new_inferior) | |
937 | { | |
938 | the_low_target.arch_setup (); | |
52fa2412 UW |
939 | #ifdef HAVE_LINUX_REGSETS |
940 | memset (disabled_regsets, 0, num_regsets); | |
941 | #endif | |
d61ddec4 UW |
942 | new_inferior = 0; |
943 | } | |
944 | ||
0d62e5e8 DJ |
945 | if (debug_threads |
946 | && WIFSTOPPED (*wstatp)) | |
947 | { | |
896c7fbb | 948 | struct thread_info *saved_inferior = current_inferior; |
0d62e5e8 | 949 | current_inferior = (struct thread_info *) |
95954743 | 950 | find_inferior_id (&all_threads, child->head.id); |
0d62e5e8 DJ |
951 | /* For testing only; i386_stop_pc prints out a diagnostic. */ |
952 | if (the_low_target.get_pc != NULL) | |
953 | get_stop_pc (); | |
896c7fbb | 954 | current_inferior = saved_inferior; |
0d62e5e8 | 955 | } |
bd99dc85 PA |
956 | |
957 | return child; | |
0d62e5e8 | 958 | } |
611cb4a5 | 959 | |
bd99dc85 PA |
960 | /* Wait for an event from child PID. If PID is -1, wait for any |
961 | child. Store the stop status through the status pointer WSTAT. | |
962 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
963 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
964 | the stopped child otherwise. */ | |
965 | ||
0d62e5e8 | 966 | static int |
95954743 | 967 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 DJ |
968 | { |
969 | CORE_ADDR stop_pc; | |
bd99dc85 | 970 | struct lwp_info *event_child = NULL; |
b65d95c5 | 971 | int bp_status; |
bd99dc85 | 972 | struct lwp_info *requested_child = NULL; |
0d62e5e8 | 973 | |
95954743 | 974 | /* Check for a lwp with a pending status. */ |
0d62e5e8 DJ |
975 | /* It is possible that the user changed the pending task's registers since |
976 | it stopped. We correctly handle the change of PC if we hit a breakpoint | |
e5379b03 | 977 | (in check_removed_breakpoint); signals should be reported anyway. */ |
bd99dc85 | 978 | |
95954743 PA |
979 | if (ptid_equal (ptid, minus_one_ptid) |
980 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 981 | { |
54a0b537 | 982 | event_child = (struct lwp_info *) |
95954743 | 983 | find_inferior (&all_lwps, status_pending_p, &ptid); |
0d62e5e8 | 984 | if (debug_threads && event_child) |
bd99dc85 | 985 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
986 | } |
987 | else | |
988 | { | |
95954743 | 989 | requested_child = find_lwp_pid (ptid); |
bd99dc85 PA |
990 | if (requested_child->status_pending_p |
991 | && !check_removed_breakpoint (requested_child)) | |
992 | event_child = requested_child; | |
0d62e5e8 | 993 | } |
611cb4a5 | 994 | |
0d62e5e8 DJ |
995 | if (event_child != NULL) |
996 | { | |
bd99dc85 PA |
997 | if (debug_threads) |
998 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
999 | lwpid_of (event_child), event_child->status_pending); | |
1000 | *wstat = event_child->status_pending; | |
1001 | event_child->status_pending_p = 0; | |
1002 | event_child->status_pending = 0; | |
1003 | current_inferior = get_lwp_thread (event_child); | |
1004 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1005 | } |
1006 | ||
1007 | /* We only enter this loop if no process has a pending wait status. Thus | |
1008 | any action taken in response to a wait status inside this loop is | |
1009 | responding as soon as we detect the status, not after any pending | |
1010 | events. */ | |
1011 | while (1) | |
1012 | { | |
95954743 | 1013 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1014 | |
bd99dc85 PA |
1015 | if ((options & WNOHANG) && event_child == NULL) |
1016 | return 0; | |
0d62e5e8 DJ |
1017 | |
1018 | if (event_child == NULL) | |
1019 | error ("event from unknown child"); | |
611cb4a5 | 1020 | |
bd99dc85 | 1021 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1022 | |
89be2091 | 1023 | /* Check for thread exit. */ |
bd99dc85 | 1024 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1025 | { |
89be2091 | 1026 | if (debug_threads) |
95954743 | 1027 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1028 | |
1029 | /* If the last thread is exiting, just return. */ | |
95954743 | 1030 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1031 | { |
1032 | if (debug_threads) | |
95954743 PA |
1033 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1034 | lwpid_of (event_child)); | |
bd99dc85 PA |
1035 | return lwpid_of (event_child); |
1036 | } | |
89be2091 | 1037 | |
bd99dc85 | 1038 | delete_lwp (event_child); |
89be2091 | 1039 | |
bd99dc85 PA |
1040 | if (!non_stop) |
1041 | { | |
1042 | current_inferior = (struct thread_info *) all_threads.head; | |
1043 | if (debug_threads) | |
1044 | fprintf (stderr, "Current inferior is now %ld\n", | |
1045 | lwpid_of (get_thread_lwp (current_inferior))); | |
1046 | } | |
1047 | else | |
1048 | { | |
1049 | current_inferior = NULL; | |
1050 | if (debug_threads) | |
1051 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1052 | } | |
89be2091 DJ |
1053 | |
1054 | /* If we were waiting for this particular child to do something... | |
1055 | well, it did something. */ | |
bd99dc85 | 1056 | if (requested_child != NULL) |
95954743 | 1057 | return lwpid_of (event_child); |
89be2091 DJ |
1058 | |
1059 | /* Wait for a more interesting event. */ | |
1060 | continue; | |
1061 | } | |
1062 | ||
a6dbe5df PA |
1063 | if (event_child->must_set_ptrace_flags) |
1064 | { | |
1065 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
1066 | 0, PTRACE_O_TRACECLONE); | |
1067 | event_child->must_set_ptrace_flags = 0; | |
1068 | } | |
1069 | ||
bd99dc85 PA |
1070 | if (WIFSTOPPED (*wstat) |
1071 | && WSTOPSIG (*wstat) == SIGSTOP | |
89be2091 DJ |
1072 | && event_child->stop_expected) |
1073 | { | |
1074 | if (debug_threads) | |
1075 | fprintf (stderr, "Expected stop.\n"); | |
1076 | event_child->stop_expected = 0; | |
54a0b537 PA |
1077 | linux_resume_one_lwp (&event_child->head, |
1078 | event_child->stepping, 0, NULL); | |
89be2091 DJ |
1079 | continue; |
1080 | } | |
1081 | ||
bd99dc85 PA |
1082 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1083 | && *wstat >> 16 != 0) | |
24a09b5f | 1084 | { |
bd99dc85 | 1085 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1086 | continue; |
1087 | } | |
1088 | ||
89be2091 DJ |
1089 | /* If GDB is not interested in this signal, don't stop other |
1090 | threads, and don't report it to GDB. Just resume the | |
1091 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1092 | signals as well as any that GDB specifically requested we |
1093 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1094 | and do not ignore signals when stepping - they may require | |
1095 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1096 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1097 | thread library? */ | |
bd99dc85 | 1098 | if (WIFSTOPPED (*wstat) |
69f223ed | 1099 | && !event_child->stepping |
24a09b5f DJ |
1100 | && ( |
1101 | #ifdef USE_THREAD_DB | |
95954743 | 1102 | (current_process ()->private->thread_db_active |
bd99dc85 PA |
1103 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1104 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1105 | || |
1106 | #endif | |
bd99dc85 PA |
1107 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
1108 | && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads)))) | |
89be2091 DJ |
1109 | { |
1110 | siginfo_t info, *info_p; | |
1111 | ||
1112 | if (debug_threads) | |
24a09b5f | 1113 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1114 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1115 | |
bd99dc85 | 1116 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1117 | info_p = &info; |
1118 | else | |
1119 | info_p = NULL; | |
54a0b537 PA |
1120 | linux_resume_one_lwp (&event_child->head, |
1121 | event_child->stepping, | |
bd99dc85 | 1122 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1123 | continue; |
0d62e5e8 | 1124 | } |
611cb4a5 | 1125 | |
0d62e5e8 DJ |
1126 | /* If this event was not handled above, and is not a SIGTRAP, report |
1127 | it. */ | |
bd99dc85 PA |
1128 | if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP) |
1129 | return lwpid_of (event_child); | |
611cb4a5 | 1130 | |
0d62e5e8 DJ |
1131 | /* If this target does not support breakpoints, we simply report the |
1132 | SIGTRAP; it's of no concern to us. */ | |
1133 | if (the_low_target.get_pc == NULL) | |
bd99dc85 | 1134 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1135 | |
1136 | stop_pc = get_stop_pc (); | |
1137 | ||
1138 | /* bp_reinsert will only be set if we were single-stepping. | |
1139 | Notice that we will resume the process after hitting | |
1140 | a gdbserver breakpoint; single-stepping to/over one | |
1141 | is not supported (yet). */ | |
1142 | if (event_child->bp_reinsert != 0) | |
1143 | { | |
1144 | if (debug_threads) | |
1145 | fprintf (stderr, "Reinserted breakpoint.\n"); | |
1146 | reinsert_breakpoint (event_child->bp_reinsert); | |
1147 | event_child->bp_reinsert = 0; | |
1148 | ||
1149 | /* Clear the single-stepping flag and SIGTRAP as we resume. */ | |
54a0b537 | 1150 | linux_resume_one_lwp (&event_child->head, 0, 0, NULL); |
0d62e5e8 DJ |
1151 | continue; |
1152 | } | |
1153 | ||
b65d95c5 | 1154 | bp_status = check_breakpoints (stop_pc); |
0d62e5e8 | 1155 | |
b65d95c5 | 1156 | if (bp_status != 0) |
0d62e5e8 | 1157 | { |
b65d95c5 DJ |
1158 | if (debug_threads) |
1159 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1160 | ||
0d62e5e8 | 1161 | /* We hit one of our own breakpoints. We mark it as a pending |
e5379b03 | 1162 | breakpoint, so that check_removed_breakpoint () will do the PC |
0d62e5e8 DJ |
1163 | adjustment for us at the appropriate time. */ |
1164 | event_child->pending_is_breakpoint = 1; | |
1165 | event_child->pending_stop_pc = stop_pc; | |
1166 | ||
b65d95c5 | 1167 | /* We may need to put the breakpoint back. We continue in the event |
0d62e5e8 DJ |
1168 | loop instead of simply replacing the breakpoint right away, |
1169 | in order to not lose signals sent to the thread that hit the | |
1170 | breakpoint. Unfortunately this increases the window where another | |
1171 | thread could sneak past the removed breakpoint. For the current | |
1172 | use of server-side breakpoints (thread creation) this is | |
1173 | acceptable; but it needs to be considered before this breakpoint | |
1174 | mechanism can be used in more general ways. For some breakpoints | |
1175 | it may be necessary to stop all other threads, but that should | |
1176 | be avoided where possible. | |
1177 | ||
1178 | If breakpoint_reinsert_addr is NULL, that means that we can | |
1179 | use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, | |
1180 | mark it for reinsertion, and single-step. | |
1181 | ||
1182 | Otherwise, call the target function to figure out where we need | |
1183 | our temporary breakpoint, create it, and continue executing this | |
1184 | process. */ | |
bd99dc85 PA |
1185 | |
1186 | /* NOTE: we're lifting breakpoints in non-stop mode. This | |
1187 | is currently only used for thread event breakpoints, so | |
1188 | it isn't that bad as long as we have PTRACE_EVENT_CLONE | |
1189 | events. */ | |
b65d95c5 DJ |
1190 | if (bp_status == 2) |
1191 | /* No need to reinsert. */ | |
54a0b537 | 1192 | linux_resume_one_lwp (&event_child->head, 0, 0, NULL); |
b65d95c5 | 1193 | else if (the_low_target.breakpoint_reinsert_addr == NULL) |
0d62e5e8 DJ |
1194 | { |
1195 | event_child->bp_reinsert = stop_pc; | |
1196 | uninsert_breakpoint (stop_pc); | |
54a0b537 | 1197 | linux_resume_one_lwp (&event_child->head, 1, 0, NULL); |
0d62e5e8 DJ |
1198 | } |
1199 | else | |
1200 | { | |
1201 | reinsert_breakpoint_by_bp | |
1202 | (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); | |
54a0b537 | 1203 | linux_resume_one_lwp (&event_child->head, 0, 0, NULL); |
611cb4a5 | 1204 | } |
0d62e5e8 DJ |
1205 | |
1206 | continue; | |
1207 | } | |
1208 | ||
b65d95c5 DJ |
1209 | if (debug_threads) |
1210 | fprintf (stderr, "Hit a non-gdbserver breakpoint.\n"); | |
1211 | ||
0d62e5e8 | 1212 | /* If we were single-stepping, we definitely want to report the |
c35fafde PA |
1213 | SIGTRAP. Although the single-step operation has completed, |
1214 | do not clear clear the stepping flag yet; we need to check it | |
1215 | in wait_for_sigstop. */ | |
0d62e5e8 | 1216 | if (event_child->stepping) |
bd99dc85 | 1217 | return lwpid_of (event_child); |
0d62e5e8 DJ |
1218 | |
1219 | /* A SIGTRAP that we can't explain. It may have been a breakpoint. | |
1220 | Check if it is a breakpoint, and if so mark the process information | |
1221 | accordingly. This will handle both the necessary fiddling with the | |
1222 | PC on decr_pc_after_break targets and suppressing extra threads | |
1223 | hitting a breakpoint if two hit it at once and then GDB removes it | |
1224 | after the first is reported. Arguably it would be better to report | |
1225 | multiple threads hitting breakpoints simultaneously, but the current | |
1226 | remote protocol does not allow this. */ | |
1227 | if ((*the_low_target.breakpoint_at) (stop_pc)) | |
1228 | { | |
1229 | event_child->pending_is_breakpoint = 1; | |
1230 | event_child->pending_stop_pc = stop_pc; | |
611cb4a5 DJ |
1231 | } |
1232 | ||
bd99dc85 | 1233 | return lwpid_of (event_child); |
611cb4a5 | 1234 | } |
0d62e5e8 | 1235 | |
611cb4a5 DJ |
1236 | /* NOTREACHED */ |
1237 | return 0; | |
1238 | } | |
1239 | ||
95954743 PA |
1240 | static int |
1241 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1242 | { | |
1243 | ptid_t wait_ptid; | |
1244 | ||
1245 | if (ptid_is_pid (ptid)) | |
1246 | { | |
1247 | /* A request to wait for a specific tgid. This is not possible | |
1248 | with waitpid, so instead, we wait for any child, and leave | |
1249 | children we're not interested in right now with a pending | |
1250 | status to report later. */ | |
1251 | wait_ptid = minus_one_ptid; | |
1252 | } | |
1253 | else | |
1254 | wait_ptid = ptid; | |
1255 | ||
1256 | while (1) | |
1257 | { | |
1258 | int event_pid; | |
1259 | ||
1260 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1261 | ||
1262 | if (event_pid > 0 | |
1263 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1264 | { | |
1265 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1266 | ||
1267 | if (! WIFSTOPPED (*wstat)) | |
1268 | mark_lwp_dead (event_child, *wstat); | |
1269 | else | |
1270 | { | |
1271 | event_child->status_pending_p = 1; | |
1272 | event_child->status_pending = *wstat; | |
1273 | } | |
1274 | } | |
1275 | else | |
1276 | return event_pid; | |
1277 | } | |
1278 | } | |
1279 | ||
0d62e5e8 | 1280 | /* Wait for process, returns status. */ |
da6d8c04 | 1281 | |
95954743 PA |
1282 | static ptid_t |
1283 | linux_wait_1 (ptid_t ptid, | |
1284 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1285 | { |
e5f1222d | 1286 | int w; |
bd99dc85 PA |
1287 | struct thread_info *thread = NULL; |
1288 | struct lwp_info *lwp = NULL; | |
1289 | int options; | |
bd99dc85 PA |
1290 | int pid; |
1291 | ||
1292 | /* Translate generic target options into linux options. */ | |
1293 | options = __WALL; | |
1294 | if (target_options & TARGET_WNOHANG) | |
1295 | options |= WNOHANG; | |
0d62e5e8 DJ |
1296 | |
1297 | retry: | |
bd99dc85 PA |
1298 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1299 | ||
0d62e5e8 DJ |
1300 | /* If we were only supposed to resume one thread, only wait for |
1301 | that thread - if it's still alive. If it died, however - which | |
1302 | can happen if we're coming from the thread death case below - | |
1303 | then we need to make sure we restart the other threads. We could | |
1304 | pick a thread at random or restart all; restarting all is less | |
1305 | arbitrary. */ | |
95954743 PA |
1306 | if (!non_stop |
1307 | && !ptid_equal (cont_thread, null_ptid) | |
1308 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1309 | { |
bd99dc85 PA |
1310 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1311 | cont_thread); | |
0d62e5e8 DJ |
1312 | |
1313 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1314 | if (thread == NULL) |
64386c31 DJ |
1315 | { |
1316 | struct thread_resume resume_info; | |
95954743 | 1317 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1318 | resume_info.kind = resume_continue; |
1319 | resume_info.sig = 0; | |
2bd7c093 | 1320 | linux_resume (&resume_info, 1); |
64386c31 | 1321 | } |
bd99dc85 | 1322 | else |
95954743 | 1323 | ptid = cont_thread; |
0d62e5e8 | 1324 | } |
da6d8c04 | 1325 | |
95954743 | 1326 | pid = linux_wait_for_event (ptid, &w, options); |
bd99dc85 | 1327 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1328 | return null_ptid; |
bd99dc85 PA |
1329 | |
1330 | lwp = get_thread_lwp (current_inferior); | |
da6d8c04 | 1331 | |
0d62e5e8 DJ |
1332 | /* If we are waiting for a particular child, and it exited, |
1333 | linux_wait_for_event will return its exit status. Similarly if | |
1334 | the last child exited. If this is not the last child, however, | |
1335 | do not report it as exited until there is a 'thread exited' response | |
1336 | available in the remote protocol. Instead, just wait for another event. | |
1337 | This should be safe, because if the thread crashed we will already | |
1338 | have reported the termination signal to GDB; that should stop any | |
1339 | in-progress stepping operations, etc. | |
1340 | ||
1341 | Report the exit status of the last thread to exit. This matches | |
1342 | LinuxThreads' behavior. */ | |
1343 | ||
95954743 | 1344 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1345 | { |
bd99dc85 | 1346 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1347 | { |
95954743 PA |
1348 | int pid = pid_of (lwp); |
1349 | struct process_info *process = find_process_pid (pid); | |
5b1c542e | 1350 | |
bd99dc85 | 1351 | delete_lwp (lwp); |
5091eb23 | 1352 | linux_remove_process (process); |
5b1c542e | 1353 | |
bd99dc85 | 1354 | current_inferior = NULL; |
5b1c542e | 1355 | |
bd99dc85 PA |
1356 | if (WIFEXITED (w)) |
1357 | { | |
1358 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1359 | ourstatus->value.integer = WEXITSTATUS (w); | |
1360 | ||
1361 | if (debug_threads) | |
1362 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1363 | } | |
1364 | else | |
1365 | { | |
1366 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1367 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1368 | ||
1369 | if (debug_threads) | |
1370 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1371 | ||
1372 | } | |
5b1c542e | 1373 | |
95954743 | 1374 | return pid_to_ptid (pid); |
0d62e5e8 | 1375 | } |
da6d8c04 | 1376 | } |
0d62e5e8 | 1377 | else |
da6d8c04 | 1378 | { |
0d62e5e8 DJ |
1379 | if (!WIFSTOPPED (w)) |
1380 | goto retry; | |
da6d8c04 DJ |
1381 | } |
1382 | ||
bd99dc85 PA |
1383 | /* In all-stop, stop all threads. Be careful to only do this if |
1384 | we're about to report an event to GDB. */ | |
1385 | if (!non_stop) | |
1386 | stop_all_lwps (); | |
1387 | ||
5b1c542e | 1388 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1389 | |
bd99dc85 PA |
1390 | if (lwp->suspended && WSTOPSIG (w) == SIGSTOP) |
1391 | { | |
1392 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1393 | and it stopped cleanly, so report as SIG0. The use of | |
1394 | SIGSTOP is an implementation detail. */ | |
1395 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1396 | } | |
1397 | else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP) | |
1398 | { | |
1399 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1400 | but, it stopped for other reasons. Set stop_expected so the | |
1401 | pending SIGSTOP is ignored and the LWP is resumed. */ | |
1402 | lwp->stop_expected = 1; | |
1403 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1404 | } | |
1405 | else | |
1406 | { | |
1407 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1408 | } | |
1409 | ||
1410 | if (debug_threads) | |
95954743 PA |
1411 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
1412 | target_pid_to_str (lwp->head.id), | |
bd99dc85 PA |
1413 | ourstatus->kind, |
1414 | ourstatus->value.sig); | |
1415 | ||
95954743 | 1416 | return lwp->head.id; |
bd99dc85 PA |
1417 | } |
1418 | ||
1419 | /* Get rid of any pending event in the pipe. */ | |
1420 | static void | |
1421 | async_file_flush (void) | |
1422 | { | |
1423 | int ret; | |
1424 | char buf; | |
1425 | ||
1426 | do | |
1427 | ret = read (linux_event_pipe[0], &buf, 1); | |
1428 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1429 | } | |
1430 | ||
1431 | /* Put something in the pipe, so the event loop wakes up. */ | |
1432 | static void | |
1433 | async_file_mark (void) | |
1434 | { | |
1435 | int ret; | |
1436 | ||
1437 | async_file_flush (); | |
1438 | ||
1439 | do | |
1440 | ret = write (linux_event_pipe[1], "+", 1); | |
1441 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1442 | ||
1443 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1444 | be awakened anyway. */ | |
1445 | } | |
1446 | ||
95954743 PA |
1447 | static ptid_t |
1448 | linux_wait (ptid_t ptid, | |
1449 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1450 | { |
95954743 | 1451 | ptid_t event_ptid; |
bd99dc85 PA |
1452 | |
1453 | if (debug_threads) | |
95954743 | 1454 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1455 | |
1456 | /* Flush the async file first. */ | |
1457 | if (target_is_async_p ()) | |
1458 | async_file_flush (); | |
1459 | ||
95954743 | 1460 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1461 | |
1462 | /* If at least one stop was reported, there may be more. A single | |
1463 | SIGCHLD can signal more than one child stop. */ | |
1464 | if (target_is_async_p () | |
1465 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1466 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1467 | async_file_mark (); |
1468 | ||
1469 | return event_ptid; | |
da6d8c04 DJ |
1470 | } |
1471 | ||
fd500816 DJ |
1472 | /* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if |
1473 | thread groups are in use, we need to use tkill. */ | |
1474 | ||
1475 | static int | |
a1928bad | 1476 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 DJ |
1477 | { |
1478 | static int tkill_failed; | |
1479 | ||
1480 | errno = 0; | |
1481 | ||
1482 | #ifdef SYS_tkill | |
1483 | if (!tkill_failed) | |
1484 | { | |
1485 | int ret = syscall (SYS_tkill, lwpid, signo); | |
1486 | if (errno != ENOSYS) | |
1b3f6016 | 1487 | return ret; |
fd500816 DJ |
1488 | errno = 0; |
1489 | tkill_failed = 1; | |
1490 | } | |
1491 | #endif | |
1492 | ||
1493 | return kill (lwpid, signo); | |
1494 | } | |
1495 | ||
0d62e5e8 DJ |
1496 | static void |
1497 | send_sigstop (struct inferior_list_entry *entry) | |
1498 | { | |
54a0b537 | 1499 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1500 | int pid; |
0d62e5e8 | 1501 | |
54a0b537 | 1502 | if (lwp->stopped) |
0d62e5e8 DJ |
1503 | return; |
1504 | ||
bd99dc85 PA |
1505 | pid = lwpid_of (lwp); |
1506 | ||
0d62e5e8 DJ |
1507 | /* If we already have a pending stop signal for this process, don't |
1508 | send another. */ | |
54a0b537 | 1509 | if (lwp->stop_expected) |
0d62e5e8 | 1510 | { |
ae13219e | 1511 | if (debug_threads) |
bd99dc85 | 1512 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e DJ |
1513 | |
1514 | /* We clear the stop_expected flag so that wait_for_sigstop | |
1515 | will receive the SIGSTOP event (instead of silently resuming and | |
1516 | waiting again). It'll be reset below. */ | |
54a0b537 | 1517 | lwp->stop_expected = 0; |
0d62e5e8 DJ |
1518 | return; |
1519 | } | |
1520 | ||
1521 | if (debug_threads) | |
bd99dc85 | 1522 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 1523 | |
bd99dc85 | 1524 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
1525 | } |
1526 | ||
95954743 PA |
1527 | static void |
1528 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
1529 | { | |
1530 | /* It's dead, really. */ | |
1531 | lwp->dead = 1; | |
1532 | ||
1533 | /* Store the exit status for later. */ | |
1534 | lwp->status_pending_p = 1; | |
1535 | lwp->status_pending = wstat; | |
1536 | ||
1537 | /* So that check_removed_breakpoint doesn't try to figure out if | |
1538 | this is stopped at a breakpoint. */ | |
1539 | lwp->pending_is_breakpoint = 0; | |
1540 | ||
1541 | /* Prevent trying to stop it. */ | |
1542 | lwp->stopped = 1; | |
1543 | ||
1544 | /* No further stops are expected from a dead lwp. */ | |
1545 | lwp->stop_expected = 0; | |
1546 | } | |
1547 | ||
0d62e5e8 DJ |
1548 | static void |
1549 | wait_for_sigstop (struct inferior_list_entry *entry) | |
1550 | { | |
54a0b537 | 1551 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 1552 | struct thread_info *saved_inferior; |
a1928bad | 1553 | int wstat; |
95954743 PA |
1554 | ptid_t saved_tid; |
1555 | ptid_t ptid; | |
0d62e5e8 | 1556 | |
54a0b537 | 1557 | if (lwp->stopped) |
0d62e5e8 DJ |
1558 | return; |
1559 | ||
1560 | saved_inferior = current_inferior; | |
bd99dc85 PA |
1561 | if (saved_inferior != NULL) |
1562 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
1563 | else | |
95954743 | 1564 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 1565 | |
95954743 | 1566 | ptid = lwp->head.id; |
bd99dc85 PA |
1567 | |
1568 | linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
1569 | |
1570 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
1571 | and record the pending SIGSTOP. If the process exited, just | |
1572 | return. */ | |
1573 | if (WIFSTOPPED (wstat) | |
1574 | && WSTOPSIG (wstat) != SIGSTOP) | |
1575 | { | |
1576 | if (debug_threads) | |
24a09b5f | 1577 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
bd99dc85 | 1578 | lwpid_of (lwp), wstat); |
c35fafde PA |
1579 | |
1580 | /* Do not leave a pending single-step finish to be reported to | |
1581 | the client. The client will give us a new action for this | |
1582 | thread, possibly a continue request --- otherwise, the client | |
1583 | would consider this pending SIGTRAP reported later a spurious | |
1584 | signal. */ | |
1585 | if (WSTOPSIG (wstat) == SIGTRAP | |
1586 | && lwp->stepping | |
1587 | && !linux_stopped_by_watchpoint ()) | |
1588 | { | |
1589 | if (debug_threads) | |
1590 | fprintf (stderr, " single-step SIGTRAP ignored\n"); | |
1591 | } | |
1592 | else | |
1593 | { | |
1594 | lwp->status_pending_p = 1; | |
1595 | lwp->status_pending = wstat; | |
1596 | } | |
54a0b537 | 1597 | lwp->stop_expected = 1; |
0d62e5e8 | 1598 | } |
95954743 PA |
1599 | else if (!WIFSTOPPED (wstat)) |
1600 | { | |
1601 | if (debug_threads) | |
1602 | fprintf (stderr, "Process %ld exited while stopping LWPs\n", | |
1603 | lwpid_of (lwp)); | |
1604 | ||
1605 | /* Leave this status pending for the next time we're able to | |
1606 | report it. In the mean time, we'll report this lwp as dead | |
1607 | to GDB, so GDB doesn't try to read registers and memory from | |
1608 | it. */ | |
1609 | mark_lwp_dead (lwp, wstat); | |
1610 | } | |
0d62e5e8 | 1611 | |
bd99dc85 | 1612 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
1613 | current_inferior = saved_inferior; |
1614 | else | |
1615 | { | |
1616 | if (debug_threads) | |
1617 | fprintf (stderr, "Previously current thread died.\n"); | |
1618 | ||
bd99dc85 PA |
1619 | if (non_stop) |
1620 | { | |
1621 | /* We can't change the current inferior behind GDB's back, | |
1622 | otherwise, a subsequent command may apply to the wrong | |
1623 | process. */ | |
1624 | current_inferior = NULL; | |
1625 | } | |
1626 | else | |
1627 | { | |
1628 | /* Set a valid thread as current. */ | |
1629 | set_desired_inferior (0); | |
1630 | } | |
0d62e5e8 DJ |
1631 | } |
1632 | } | |
1633 | ||
1634 | static void | |
54a0b537 | 1635 | stop_all_lwps (void) |
0d62e5e8 DJ |
1636 | { |
1637 | stopping_threads = 1; | |
54a0b537 PA |
1638 | for_each_inferior (&all_lwps, send_sigstop); |
1639 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
1640 | stopping_threads = 0; |
1641 | } | |
1642 | ||
da6d8c04 DJ |
1643 | /* Resume execution of the inferior process. |
1644 | If STEP is nonzero, single-step it. | |
1645 | If SIGNAL is nonzero, give it that signal. */ | |
1646 | ||
ce3a066d | 1647 | static void |
54a0b537 PA |
1648 | linux_resume_one_lwp (struct inferior_list_entry *entry, |
1649 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 1650 | { |
54a0b537 | 1651 | struct lwp_info *lwp = (struct lwp_info *) entry; |
0d62e5e8 DJ |
1652 | struct thread_info *saved_inferior; |
1653 | ||
54a0b537 | 1654 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
1655 | return; |
1656 | ||
1657 | /* If we have pending signals or status, and a new signal, enqueue the | |
1658 | signal. Also enqueue the signal if we are waiting to reinsert a | |
1659 | breakpoint; it will be picked up again below. */ | |
1660 | if (signal != 0 | |
54a0b537 PA |
1661 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
1662 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
1663 | { |
1664 | struct pending_signals *p_sig; | |
bca929d3 | 1665 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 1666 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 1667 | p_sig->signal = signal; |
32ca6d61 DJ |
1668 | if (info == NULL) |
1669 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1670 | else | |
1671 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 1672 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
1673 | } |
1674 | ||
54a0b537 | 1675 | if (lwp->status_pending_p && !check_removed_breakpoint (lwp)) |
0d62e5e8 DJ |
1676 | return; |
1677 | ||
1678 | saved_inferior = current_inferior; | |
54a0b537 | 1679 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
1680 | |
1681 | if (debug_threads) | |
1b3f6016 | 1682 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 1683 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 1684 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
1685 | |
1686 | /* This bit needs some thinking about. If we get a signal that | |
1687 | we must report while a single-step reinsert is still pending, | |
1688 | we often end up resuming the thread. It might be better to | |
1689 | (ew) allow a stack of pending events; then we could be sure that | |
1690 | the reinsert happened right away and not lose any signals. | |
1691 | ||
1692 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 1693 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
1694 | complete correctness, so it won't solve that problem. It may be |
1695 | worthwhile just to solve this one, however. */ | |
54a0b537 | 1696 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
1697 | { |
1698 | if (debug_threads) | |
54a0b537 | 1699 | fprintf (stderr, " pending reinsert at %08lx", (long)lwp->bp_reinsert); |
0d62e5e8 DJ |
1700 | if (step == 0) |
1701 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
1702 | step = 1; | |
1703 | ||
1704 | /* Postpone any pending signal. It was enqueued above. */ | |
1705 | signal = 0; | |
1706 | } | |
1707 | ||
54a0b537 | 1708 | check_removed_breakpoint (lwp); |
0d62e5e8 | 1709 | |
aa691b87 | 1710 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 DJ |
1711 | { |
1712 | fprintf (stderr, " "); | |
52fb6437 | 1713 | (*the_low_target.get_pc) (); |
0d62e5e8 DJ |
1714 | } |
1715 | ||
1716 | /* If we have pending signals, consume one unless we are trying to reinsert | |
1717 | a breakpoint. */ | |
54a0b537 | 1718 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
1719 | { |
1720 | struct pending_signals **p_sig; | |
1721 | ||
54a0b537 | 1722 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
1723 | while ((*p_sig)->prev != NULL) |
1724 | p_sig = &(*p_sig)->prev; | |
1725 | ||
1726 | signal = (*p_sig)->signal; | |
32ca6d61 | 1727 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 1728 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 1729 | |
0d62e5e8 DJ |
1730 | free (*p_sig); |
1731 | *p_sig = NULL; | |
1732 | } | |
1733 | ||
1734 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 1735 | get_lwp_thread (lwp)); |
da6d8c04 | 1736 | errno = 0; |
54a0b537 PA |
1737 | lwp->stopped = 0; |
1738 | lwp->stepping = step; | |
bd99dc85 | 1739 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal); |
0d62e5e8 DJ |
1740 | |
1741 | current_inferior = saved_inferior; | |
da6d8c04 | 1742 | if (errno) |
3221518c UW |
1743 | { |
1744 | /* ESRCH from ptrace either means that the thread was already | |
1745 | running (an error) or that it is gone (a race condition). If | |
1746 | it's gone, we will get a notification the next time we wait, | |
1747 | so we can ignore the error. We could differentiate these | |
1748 | two, but it's tricky without waiting; the thread still exists | |
1749 | as a zombie, so sending it signal 0 would succeed. So just | |
1750 | ignore ESRCH. */ | |
1751 | if (errno == ESRCH) | |
1752 | return; | |
1753 | ||
1754 | perror_with_name ("ptrace"); | |
1755 | } | |
da6d8c04 DJ |
1756 | } |
1757 | ||
2bd7c093 PA |
1758 | struct thread_resume_array |
1759 | { | |
1760 | struct thread_resume *resume; | |
1761 | size_t n; | |
1762 | }; | |
64386c31 DJ |
1763 | |
1764 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
1765 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
1766 | resume request. | |
1767 | ||
1768 | This algorithm is O(threads * resume elements), but resume elements | |
1769 | is small (and will remain small at least until GDB supports thread | |
1770 | suspension). */ | |
2bd7c093 PA |
1771 | static int |
1772 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 1773 | { |
54a0b537 | 1774 | struct lwp_info *lwp; |
64386c31 | 1775 | struct thread_info *thread; |
5544ad89 | 1776 | int ndx; |
2bd7c093 | 1777 | struct thread_resume_array *r; |
64386c31 DJ |
1778 | |
1779 | thread = (struct thread_info *) entry; | |
54a0b537 | 1780 | lwp = get_thread_lwp (thread); |
2bd7c093 | 1781 | r = arg; |
64386c31 | 1782 | |
2bd7c093 | 1783 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
1784 | { |
1785 | ptid_t ptid = r->resume[ndx].thread; | |
1786 | if (ptid_equal (ptid, minus_one_ptid) | |
1787 | || ptid_equal (ptid, entry->id) | |
1788 | || (ptid_is_pid (ptid) | |
1789 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
1790 | || (ptid_get_lwp (ptid) == -1 | |
1791 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
1792 | { | |
1793 | lwp->resume = &r->resume[ndx]; | |
1794 | return 0; | |
1795 | } | |
1796 | } | |
2bd7c093 PA |
1797 | |
1798 | /* No resume action for this thread. */ | |
1799 | lwp->resume = NULL; | |
64386c31 | 1800 | |
2bd7c093 | 1801 | return 0; |
5544ad89 DJ |
1802 | } |
1803 | ||
5544ad89 | 1804 | |
bd99dc85 PA |
1805 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
1806 | static int | |
1807 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 1808 | { |
bd99dc85 | 1809 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 1810 | |
bd99dc85 PA |
1811 | /* LWPs which will not be resumed are not interesting, because |
1812 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 1813 | if (lwp->resume == NULL) |
bd99dc85 | 1814 | return 0; |
64386c31 | 1815 | |
bd99dc85 PA |
1816 | /* If this thread has a removed breakpoint, we won't have any |
1817 | events to report later, so check now. check_removed_breakpoint | |
1818 | may clear status_pending_p. We avoid calling check_removed_breakpoint | |
1819 | for any thread that we are not otherwise going to resume - this | |
1820 | lets us preserve stopped status when two threads hit a breakpoint. | |
1821 | GDB removes the breakpoint to single-step a particular thread | |
1822 | past it, then re-inserts it and resumes all threads. We want | |
1823 | to report the second thread without resuming it in the interim. */ | |
1824 | if (lwp->status_pending_p) | |
1825 | check_removed_breakpoint (lwp); | |
5544ad89 | 1826 | |
bd99dc85 PA |
1827 | if (lwp->status_pending_p) |
1828 | * (int *) flag_p = 1; | |
c6ecbae5 | 1829 | |
bd99dc85 | 1830 | return 0; |
5544ad89 DJ |
1831 | } |
1832 | ||
1833 | /* This function is called once per thread. We check the thread's resume | |
1834 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 1835 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 1836 | |
bd99dc85 PA |
1837 | For threads which we aren't explicitly told otherwise, we preserve |
1838 | the stepping flag; this is used for stepping over gdbserver-placed | |
1839 | breakpoints. | |
1840 | ||
1841 | If pending_flags was set in any thread, we queue any needed | |
1842 | signals, since we won't actually resume. We already have a pending | |
1843 | event to report, so we don't need to preserve any step requests; | |
1844 | they should be re-issued if necessary. */ | |
1845 | ||
1846 | static int | |
1847 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 1848 | { |
54a0b537 | 1849 | struct lwp_info *lwp; |
5544ad89 | 1850 | struct thread_info *thread; |
bd99dc85 PA |
1851 | int step; |
1852 | int pending_flag = * (int *) arg; | |
5544ad89 DJ |
1853 | |
1854 | thread = (struct thread_info *) entry; | |
54a0b537 | 1855 | lwp = get_thread_lwp (thread); |
5544ad89 | 1856 | |
2bd7c093 | 1857 | if (lwp->resume == NULL) |
bd99dc85 | 1858 | return 0; |
5544ad89 | 1859 | |
bd99dc85 | 1860 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 1861 | { |
bd99dc85 PA |
1862 | if (debug_threads) |
1863 | fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp)); | |
1864 | ||
1865 | if (!lwp->stopped) | |
1866 | { | |
1867 | if (debug_threads) | |
95954743 | 1868 | fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
1869 | |
1870 | lwp->suspended = 1; | |
1871 | send_sigstop (&lwp->head); | |
1872 | } | |
1873 | else | |
1874 | { | |
1875 | if (debug_threads) | |
1876 | { | |
1877 | if (lwp->suspended) | |
1878 | fprintf (stderr, "already stopped/suspended LWP %ld\n", | |
1879 | lwpid_of (lwp)); | |
1880 | else | |
1881 | fprintf (stderr, "already stopped/not suspended LWP %ld\n", | |
1882 | lwpid_of (lwp)); | |
1883 | } | |
32ca6d61 | 1884 | |
bd99dc85 PA |
1885 | /* Make sure we leave the LWP suspended, so we don't try to |
1886 | resume it without GDB telling us to. FIXME: The LWP may | |
1887 | have been stopped in an internal event that was not meant | |
1888 | to be notified back to GDB (e.g., gdbserver breakpoint), | |
1889 | so we should be reporting a stop event in that case | |
1890 | too. */ | |
1891 | lwp->suspended = 1; | |
1892 | } | |
32ca6d61 | 1893 | |
bd99dc85 PA |
1894 | /* For stop requests, we're done. */ |
1895 | lwp->resume = NULL; | |
1896 | return 0; | |
5544ad89 | 1897 | } |
bd99dc85 PA |
1898 | else |
1899 | lwp->suspended = 0; | |
5544ad89 | 1900 | |
bd99dc85 PA |
1901 | /* If this thread which is about to be resumed has a pending status, |
1902 | then don't resume any threads - we can just report the pending | |
1903 | status. Make sure to queue any signals that would otherwise be | |
1904 | sent. In all-stop mode, we do this decision based on if *any* | |
1905 | thread has a pending status. */ | |
1906 | if (non_stop) | |
1907 | resume_status_pending_p (&lwp->head, &pending_flag); | |
5544ad89 | 1908 | |
bd99dc85 PA |
1909 | if (!pending_flag) |
1910 | { | |
1911 | if (debug_threads) | |
1912 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 1913 | |
95954743 | 1914 | if (ptid_equal (lwp->resume->thread, minus_one_ptid) |
bd99dc85 PA |
1915 | && lwp->stepping |
1916 | && lwp->pending_is_breakpoint) | |
1917 | step = 1; | |
1918 | else | |
1919 | step = (lwp->resume->kind == resume_step); | |
5544ad89 | 1920 | |
bd99dc85 PA |
1921 | linux_resume_one_lwp (&lwp->head, step, lwp->resume->sig, NULL); |
1922 | } | |
1923 | else | |
1924 | { | |
1925 | if (debug_threads) | |
1926 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 1927 | |
bd99dc85 PA |
1928 | /* If we have a new signal, enqueue the signal. */ |
1929 | if (lwp->resume->sig != 0) | |
1930 | { | |
1931 | struct pending_signals *p_sig; | |
1932 | p_sig = xmalloc (sizeof (*p_sig)); | |
1933 | p_sig->prev = lwp->pending_signals; | |
1934 | p_sig->signal = lwp->resume->sig; | |
1935 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1936 | ||
1937 | /* If this is the same signal we were previously stopped by, | |
1938 | make sure to queue its siginfo. We can ignore the return | |
1939 | value of ptrace; if it fails, we'll skip | |
1940 | PTRACE_SETSIGINFO. */ | |
1941 | if (WIFSTOPPED (lwp->last_status) | |
1942 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
1943 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1944 | ||
1945 | lwp->pending_signals = p_sig; | |
1946 | } | |
1947 | } | |
5544ad89 | 1948 | |
bd99dc85 | 1949 | lwp->resume = NULL; |
5544ad89 | 1950 | return 0; |
0d62e5e8 DJ |
1951 | } |
1952 | ||
1953 | static void | |
2bd7c093 | 1954 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 1955 | { |
5544ad89 | 1956 | int pending_flag; |
2bd7c093 | 1957 | struct thread_resume_array array = { resume_info, n }; |
c6ecbae5 | 1958 | |
2bd7c093 | 1959 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 DJ |
1960 | |
1961 | /* If there is a thread which would otherwise be resumed, which | |
1962 | has a pending status, then don't resume any threads - we can just | |
1963 | report the pending status. Make sure to queue any signals | |
bd99dc85 PA |
1964 | that would otherwise be sent. In non-stop mode, we'll apply this |
1965 | logic to each thread individually. */ | |
5544ad89 | 1966 | pending_flag = 0; |
bd99dc85 PA |
1967 | if (!non_stop) |
1968 | find_inferior (&all_lwps, resume_status_pending_p, &pending_flag); | |
5544ad89 DJ |
1969 | |
1970 | if (debug_threads) | |
1971 | { | |
1972 | if (pending_flag) | |
1973 | fprintf (stderr, "Not resuming, pending status\n"); | |
1974 | else | |
1975 | fprintf (stderr, "Resuming, no pending status\n"); | |
1976 | } | |
1977 | ||
bd99dc85 | 1978 | find_inferior (&all_threads, linux_resume_one_thread, &pending_flag); |
0d62e5e8 DJ |
1979 | } |
1980 | ||
1981 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
1982 | |
1983 | int | |
0a30fbc4 | 1984 | register_addr (int regnum) |
da6d8c04 DJ |
1985 | { |
1986 | int addr; | |
1987 | ||
2ec06d2e | 1988 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
1989 | error ("Invalid register number %d.", regnum); |
1990 | ||
2ec06d2e | 1991 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
1992 | |
1993 | return addr; | |
1994 | } | |
1995 | ||
58caa3dc | 1996 | /* Fetch one register. */ |
da6d8c04 DJ |
1997 | static void |
1998 | fetch_register (int regno) | |
1999 | { | |
2000 | CORE_ADDR regaddr; | |
48d93c75 | 2001 | int i, size; |
0d62e5e8 | 2002 | char *buf; |
95954743 | 2003 | int pid; |
da6d8c04 | 2004 | |
2ec06d2e | 2005 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2006 | return; |
2ec06d2e | 2007 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2008 | return; |
da6d8c04 | 2009 | |
0a30fbc4 DJ |
2010 | regaddr = register_addr (regno); |
2011 | if (regaddr == -1) | |
2012 | return; | |
95954743 PA |
2013 | |
2014 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2015 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2016 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2017 | buf = alloca (size); |
2018 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2019 | { |
2020 | errno = 0; | |
0d62e5e8 | 2021 | *(PTRACE_XFER_TYPE *) (buf + i) = |
95954743 | 2022 | ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
da6d8c04 DJ |
2023 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2024 | if (errno != 0) | |
2025 | { | |
2026 | /* Warning, not error, in case we are attached; sometimes the | |
2027 | kernel doesn't let us at the registers. */ | |
2028 | char *err = strerror (errno); | |
2029 | char *msg = alloca (strlen (err) + 128); | |
2030 | sprintf (msg, "reading register %d: %s", regno, err); | |
2031 | error (msg); | |
2032 | goto error_exit; | |
2033 | } | |
2034 | } | |
ee1a7ae4 UW |
2035 | |
2036 | if (the_low_target.supply_ptrace_register) | |
2037 | the_low_target.supply_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2038 | else |
2039 | supply_register (regno, buf); | |
0d62e5e8 | 2040 | |
da6d8c04 DJ |
2041 | error_exit:; |
2042 | } | |
2043 | ||
2044 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc DJ |
2045 | static void |
2046 | usr_fetch_inferior_registers (int regno) | |
da6d8c04 DJ |
2047 | { |
2048 | if (regno == -1 || regno == 0) | |
2ec06d2e | 2049 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
da6d8c04 DJ |
2050 | fetch_register (regno); |
2051 | else | |
2052 | fetch_register (regno); | |
2053 | } | |
2054 | ||
2055 | /* Store our register values back into the inferior. | |
2056 | If REGNO is -1, do this for all registers. | |
2057 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc DJ |
2058 | static void |
2059 | usr_store_inferior_registers (int regno) | |
da6d8c04 DJ |
2060 | { |
2061 | CORE_ADDR regaddr; | |
48d93c75 | 2062 | int i, size; |
0d62e5e8 | 2063 | char *buf; |
55ac2b99 | 2064 | int pid; |
da6d8c04 DJ |
2065 | |
2066 | if (regno >= 0) | |
2067 | { | |
2ec06d2e | 2068 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2069 | return; |
2070 | ||
bc1e36ca | 2071 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2072 | return; |
2073 | ||
2074 | regaddr = register_addr (regno); | |
2075 | if (regaddr == -1) | |
da6d8c04 | 2076 | return; |
da6d8c04 | 2077 | errno = 0; |
48d93c75 UW |
2078 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2079 | & - sizeof (PTRACE_XFER_TYPE); | |
2080 | buf = alloca (size); | |
2081 | memset (buf, 0, size); | |
ee1a7ae4 UW |
2082 | |
2083 | if (the_low_target.collect_ptrace_register) | |
2084 | the_low_target.collect_ptrace_register (regno, buf); | |
5a1f5858 DJ |
2085 | else |
2086 | collect_register (regno, buf); | |
ee1a7ae4 | 2087 | |
95954743 | 2088 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 2089 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 2090 | { |
0a30fbc4 | 2091 | errno = 0; |
95954743 | 2092 | ptrace (PTRACE_POKEUSER, pid, (PTRACE_ARG3_TYPE) regaddr, |
2ff29de4 | 2093 | *(PTRACE_XFER_TYPE *) (buf + i)); |
da6d8c04 DJ |
2094 | if (errno != 0) |
2095 | { | |
1b3f6016 PA |
2096 | /* At this point, ESRCH should mean the process is |
2097 | already gone, in which case we simply ignore attempts | |
2098 | to change its registers. See also the related | |
2099 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
2100 | if (errno == ESRCH) |
2101 | return; | |
2102 | ||
bc1e36ca DJ |
2103 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
2104 | { | |
2105 | char *err = strerror (errno); | |
2106 | char *msg = alloca (strlen (err) + 128); | |
2107 | sprintf (msg, "writing register %d: %s", | |
2108 | regno, err); | |
2109 | error (msg); | |
2110 | return; | |
2111 | } | |
da6d8c04 | 2112 | } |
2ff29de4 | 2113 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 2114 | } |
da6d8c04 DJ |
2115 | } |
2116 | else | |
2ec06d2e | 2117 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
0d62e5e8 | 2118 | usr_store_inferior_registers (regno); |
da6d8c04 | 2119 | } |
58caa3dc DJ |
2120 | #endif /* HAVE_LINUX_USRREGS */ |
2121 | ||
2122 | ||
2123 | ||
2124 | #ifdef HAVE_LINUX_REGSETS | |
2125 | ||
2126 | static int | |
0d62e5e8 | 2127 | regsets_fetch_inferior_registers () |
58caa3dc DJ |
2128 | { |
2129 | struct regset_info *regset; | |
e9d25b98 | 2130 | int saw_general_regs = 0; |
95954743 | 2131 | int pid; |
58caa3dc DJ |
2132 | |
2133 | regset = target_regsets; | |
2134 | ||
95954743 | 2135 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2136 | while (regset->size >= 0) |
2137 | { | |
2138 | void *buf; | |
2139 | int res; | |
2140 | ||
52fa2412 | 2141 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2142 | { |
2143 | regset ++; | |
2144 | continue; | |
2145 | } | |
2146 | ||
bca929d3 | 2147 | buf = xmalloc (regset->size); |
dfb64f85 | 2148 | #ifndef __sparc__ |
95954743 | 2149 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2150 | #else |
95954743 | 2151 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2152 | #endif |
58caa3dc DJ |
2153 | if (res < 0) |
2154 | { | |
2155 | if (errno == EIO) | |
2156 | { | |
52fa2412 UW |
2157 | /* If we get EIO on a regset, do not try it again for |
2158 | this process. */ | |
2159 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2160 | free (buf); |
52fa2412 | 2161 | continue; |
58caa3dc DJ |
2162 | } |
2163 | else | |
2164 | { | |
0d62e5e8 | 2165 | char s[256]; |
95954743 PA |
2166 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
2167 | pid); | |
0d62e5e8 | 2168 | perror (s); |
58caa3dc DJ |
2169 | } |
2170 | } | |
e9d25b98 DJ |
2171 | else if (regset->type == GENERAL_REGS) |
2172 | saw_general_regs = 1; | |
58caa3dc DJ |
2173 | regset->store_function (buf); |
2174 | regset ++; | |
fdeb2a12 | 2175 | free (buf); |
58caa3dc | 2176 | } |
e9d25b98 DJ |
2177 | if (saw_general_regs) |
2178 | return 0; | |
2179 | else | |
2180 | return 1; | |
58caa3dc DJ |
2181 | } |
2182 | ||
2183 | static int | |
0d62e5e8 | 2184 | regsets_store_inferior_registers () |
58caa3dc DJ |
2185 | { |
2186 | struct regset_info *regset; | |
e9d25b98 | 2187 | int saw_general_regs = 0; |
95954743 | 2188 | int pid; |
58caa3dc DJ |
2189 | |
2190 | regset = target_regsets; | |
2191 | ||
95954743 | 2192 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
2193 | while (regset->size >= 0) |
2194 | { | |
2195 | void *buf; | |
2196 | int res; | |
2197 | ||
52fa2412 | 2198 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
2199 | { |
2200 | regset ++; | |
2201 | continue; | |
2202 | } | |
2203 | ||
bca929d3 | 2204 | buf = xmalloc (regset->size); |
545587ee DJ |
2205 | |
2206 | /* First fill the buffer with the current register set contents, | |
2207 | in case there are any items in the kernel's regset that are | |
2208 | not in gdbserver's regcache. */ | |
dfb64f85 | 2209 | #ifndef __sparc__ |
95954743 | 2210 | res = ptrace (regset->get_request, pid, 0, buf); |
dfb64f85 | 2211 | #else |
95954743 | 2212 | res = ptrace (regset->get_request, pid, buf, 0); |
dfb64f85 | 2213 | #endif |
545587ee DJ |
2214 | |
2215 | if (res == 0) | |
2216 | { | |
2217 | /* Then overlay our cached registers on that. */ | |
2218 | regset->fill_function (buf); | |
2219 | ||
2220 | /* Only now do we write the register set. */ | |
dfb64f85 | 2221 | #ifndef __sparc__ |
95954743 | 2222 | res = ptrace (regset->set_request, pid, 0, buf); |
dfb64f85 | 2223 | #else |
95954743 | 2224 | res = ptrace (regset->set_request, pid, buf, 0); |
dfb64f85 | 2225 | #endif |
545587ee DJ |
2226 | } |
2227 | ||
58caa3dc DJ |
2228 | if (res < 0) |
2229 | { | |
2230 | if (errno == EIO) | |
2231 | { | |
52fa2412 UW |
2232 | /* If we get EIO on a regset, do not try it again for |
2233 | this process. */ | |
2234 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 2235 | free (buf); |
52fa2412 | 2236 | continue; |
58caa3dc | 2237 | } |
3221518c UW |
2238 | else if (errno == ESRCH) |
2239 | { | |
1b3f6016 PA |
2240 | /* At this point, ESRCH should mean the process is |
2241 | already gone, in which case we simply ignore attempts | |
2242 | to change its registers. See also the related | |
2243 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 2244 | free (buf); |
3221518c UW |
2245 | return 0; |
2246 | } | |
58caa3dc DJ |
2247 | else |
2248 | { | |
ce3a066d | 2249 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
2250 | } |
2251 | } | |
e9d25b98 DJ |
2252 | else if (regset->type == GENERAL_REGS) |
2253 | saw_general_regs = 1; | |
58caa3dc | 2254 | regset ++; |
09ec9b38 | 2255 | free (buf); |
58caa3dc | 2256 | } |
e9d25b98 DJ |
2257 | if (saw_general_regs) |
2258 | return 0; | |
2259 | else | |
2260 | return 1; | |
ce3a066d | 2261 | return 0; |
58caa3dc DJ |
2262 | } |
2263 | ||
2264 | #endif /* HAVE_LINUX_REGSETS */ | |
2265 | ||
2266 | ||
2267 | void | |
ce3a066d | 2268 | linux_fetch_registers (int regno) |
58caa3dc DJ |
2269 | { |
2270 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2271 | if (regsets_fetch_inferior_registers () == 0) |
2272 | return; | |
58caa3dc DJ |
2273 | #endif |
2274 | #ifdef HAVE_LINUX_USRREGS | |
2275 | usr_fetch_inferior_registers (regno); | |
2276 | #endif | |
2277 | } | |
2278 | ||
2279 | void | |
ce3a066d | 2280 | linux_store_registers (int regno) |
58caa3dc DJ |
2281 | { |
2282 | #ifdef HAVE_LINUX_REGSETS | |
52fa2412 UW |
2283 | if (regsets_store_inferior_registers () == 0) |
2284 | return; | |
58caa3dc DJ |
2285 | #endif |
2286 | #ifdef HAVE_LINUX_USRREGS | |
2287 | usr_store_inferior_registers (regno); | |
2288 | #endif | |
2289 | } | |
2290 | ||
da6d8c04 | 2291 | |
da6d8c04 DJ |
2292 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
2293 | to debugger memory starting at MYADDR. */ | |
2294 | ||
c3e735a6 | 2295 | static int |
f450004a | 2296 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
2297 | { |
2298 | register int i; | |
2299 | /* Round starting address down to longword boundary. */ | |
2300 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2301 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
2302 | register int count |
2303 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
2304 | / sizeof (PTRACE_XFER_TYPE); |
2305 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 2306 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 2307 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
2308 | int fd; |
2309 | char filename[64]; | |
95954743 | 2310 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
2311 | |
2312 | /* Try using /proc. Don't bother for one word. */ | |
2313 | if (len >= 3 * sizeof (long)) | |
2314 | { | |
2315 | /* We could keep this file open and cache it - possibly one per | |
2316 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 2317 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
2318 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
2319 | if (fd == -1) | |
2320 | goto no_proc; | |
2321 | ||
2322 | /* If pread64 is available, use it. It's faster if the kernel | |
2323 | supports it (only one syscall), and it's 64-bit safe even on | |
2324 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
2325 | application). */ | |
2326 | #ifdef HAVE_PREAD64 | |
2327 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
2328 | #else | |
2329 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len) | |
2330 | #endif | |
2331 | { | |
2332 | close (fd); | |
2333 | goto no_proc; | |
2334 | } | |
2335 | ||
2336 | close (fd); | |
2337 | return 0; | |
2338 | } | |
da6d8c04 | 2339 | |
fd462a61 | 2340 | no_proc: |
da6d8c04 DJ |
2341 | /* Read all the longwords */ |
2342 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2343 | { | |
c3e735a6 | 2344 | errno = 0; |
95954743 | 2345 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
c3e735a6 DJ |
2346 | if (errno) |
2347 | return errno; | |
da6d8c04 DJ |
2348 | } |
2349 | ||
2350 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
2351 | memcpy (myaddr, |
2352 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
2353 | len); | |
c3e735a6 DJ |
2354 | |
2355 | return 0; | |
da6d8c04 DJ |
2356 | } |
2357 | ||
2358 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
2359 | to inferior's memory at MEMADDR. | |
2360 | On failure (cannot write the inferior) | |
2361 | returns the value of errno. */ | |
2362 | ||
ce3a066d | 2363 | static int |
f450004a | 2364 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
2365 | { |
2366 | register int i; | |
2367 | /* Round starting address down to longword boundary. */ | |
2368 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
2369 | /* Round ending address up; get number of longwords that makes. */ | |
2370 | register int count | |
2371 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
2372 | /* Allocate buffer of that many longwords. */ | |
2373 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 2374 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 2375 | |
0d62e5e8 DJ |
2376 | if (debug_threads) |
2377 | { | |
2378 | fprintf (stderr, "Writing %02x to %08lx\n", (unsigned)myaddr[0], (long)memaddr); | |
2379 | } | |
2380 | ||
da6d8c04 DJ |
2381 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
2382 | ||
95954743 | 2383 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0); |
da6d8c04 DJ |
2384 | |
2385 | if (count > 1) | |
2386 | { | |
2387 | buffer[count - 1] | |
95954743 | 2388 | = ptrace (PTRACE_PEEKTEXT, pid, |
d844cde6 DJ |
2389 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
2390 | * sizeof (PTRACE_XFER_TYPE)), | |
2391 | 0); | |
da6d8c04 DJ |
2392 | } |
2393 | ||
2394 | /* Copy data to be written over corresponding part of buffer */ | |
2395 | ||
2396 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
2397 | ||
2398 | /* Write the entire buffer. */ | |
2399 | ||
2400 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
2401 | { | |
2402 | errno = 0; | |
95954743 | 2403 | ptrace (PTRACE_POKETEXT, pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
da6d8c04 DJ |
2404 | if (errno) |
2405 | return errno; | |
2406 | } | |
2407 | ||
2408 | return 0; | |
2409 | } | |
2f2893d9 | 2410 | |
24a09b5f DJ |
2411 | static int linux_supports_tracefork_flag; |
2412 | ||
51c2684e | 2413 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 2414 | |
51c2684e DJ |
2415 | static int |
2416 | linux_tracefork_grandchild (void *arg) | |
2417 | { | |
2418 | _exit (0); | |
2419 | } | |
2420 | ||
7407e2de AS |
2421 | #define STACK_SIZE 4096 |
2422 | ||
51c2684e DJ |
2423 | static int |
2424 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
2425 | { |
2426 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
2427 | kill (getpid (), SIGSTOP); | |
7407e2de AS |
2428 | #ifdef __ia64__ |
2429 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
2430 | CLONE_VM | SIGCHLD, NULL); | |
2431 | #else | |
2432 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
2433 | CLONE_VM | SIGCHLD, NULL); | |
2434 | #endif | |
24a09b5f DJ |
2435 | _exit (0); |
2436 | } | |
2437 | ||
bd99dc85 PA |
2438 | /* Wrapper function for waitpid which handles EINTR, and emulates |
2439 | __WALL for systems where that is not available. */ | |
24a09b5f DJ |
2440 | |
2441 | static int | |
2442 | my_waitpid (int pid, int *status, int flags) | |
2443 | { | |
bd99dc85 PA |
2444 | int ret, out_errno; |
2445 | ||
2446 | if (debug_threads) | |
2447 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
2448 | ||
2449 | if (flags & __WALL) | |
24a09b5f | 2450 | { |
bd99dc85 PA |
2451 | sigset_t block_mask, org_mask, wake_mask; |
2452 | int wnohang; | |
2453 | ||
2454 | wnohang = (flags & WNOHANG) != 0; | |
2455 | flags &= ~(__WALL | __WCLONE); | |
2456 | flags |= WNOHANG; | |
2457 | ||
2458 | /* Block all signals while here. This avoids knowing about | |
2459 | LinuxThread's signals. */ | |
2460 | sigfillset (&block_mask); | |
2461 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
2462 | ||
2463 | /* ... except during the sigsuspend below. */ | |
2464 | sigemptyset (&wake_mask); | |
2465 | ||
2466 | while (1) | |
2467 | { | |
2468 | /* Since all signals are blocked, there's no need to check | |
2469 | for EINTR here. */ | |
2470 | ret = waitpid (pid, status, flags); | |
2471 | out_errno = errno; | |
2472 | ||
2473 | if (ret == -1 && out_errno != ECHILD) | |
2474 | break; | |
2475 | else if (ret > 0) | |
2476 | break; | |
2477 | ||
2478 | if (flags & __WCLONE) | |
2479 | { | |
2480 | /* We've tried both flavors now. If WNOHANG is set, | |
2481 | there's nothing else to do, just bail out. */ | |
2482 | if (wnohang) | |
2483 | break; | |
2484 | ||
2485 | if (debug_threads) | |
2486 | fprintf (stderr, "blocking\n"); | |
2487 | ||
2488 | /* Block waiting for signals. */ | |
2489 | sigsuspend (&wake_mask); | |
2490 | } | |
2491 | ||
2492 | flags ^= __WCLONE; | |
2493 | } | |
2494 | ||
2495 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
24a09b5f | 2496 | } |
bd99dc85 PA |
2497 | else |
2498 | { | |
2499 | do | |
2500 | ret = waitpid (pid, status, flags); | |
2501 | while (ret == -1 && errno == EINTR); | |
2502 | out_errno = errno; | |
2503 | } | |
2504 | ||
2505 | if (debug_threads) | |
2506 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
2507 | pid, flags, status ? *status : -1, ret); | |
24a09b5f | 2508 | |
bd99dc85 | 2509 | errno = out_errno; |
24a09b5f DJ |
2510 | return ret; |
2511 | } | |
2512 | ||
2513 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make | |
2514 | sure that we can enable the option, and that it had the desired | |
2515 | effect. */ | |
2516 | ||
2517 | static void | |
2518 | linux_test_for_tracefork (void) | |
2519 | { | |
2520 | int child_pid, ret, status; | |
2521 | long second_pid; | |
bca929d3 | 2522 | char *stack = xmalloc (STACK_SIZE * 4); |
24a09b5f DJ |
2523 | |
2524 | linux_supports_tracefork_flag = 0; | |
2525 | ||
51c2684e | 2526 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
2527 | #ifdef __ia64__ |
2528 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
2529 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2530 | #else | |
2531 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, | |
2532 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
2533 | #endif | |
24a09b5f | 2534 | if (child_pid == -1) |
51c2684e | 2535 | perror_with_name ("clone"); |
24a09b5f DJ |
2536 | |
2537 | ret = my_waitpid (child_pid, &status, 0); | |
2538 | if (ret == -1) | |
2539 | perror_with_name ("waitpid"); | |
2540 | else if (ret != child_pid) | |
2541 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
2542 | if (! WIFSTOPPED (status)) | |
2543 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
2544 | ||
2545 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); | |
2546 | if (ret != 0) | |
2547 | { | |
2548 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2549 | if (ret != 0) | |
2550 | { | |
2551 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2552 | return; | |
2553 | } | |
2554 | ||
2555 | ret = my_waitpid (child_pid, &status, 0); | |
2556 | if (ret != child_pid) | |
2557 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
2558 | else if (!WIFSIGNALED (status)) | |
2559 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
2560 | "killed child", status); | |
2561 | ||
2562 | return; | |
2563 | } | |
2564 | ||
2565 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
2566 | if (ret != 0) | |
2567 | warning ("linux_test_for_tracefork: failed to resume child"); | |
2568 | ||
2569 | ret = my_waitpid (child_pid, &status, 0); | |
2570 | ||
2571 | if (ret == child_pid && WIFSTOPPED (status) | |
2572 | && status >> 16 == PTRACE_EVENT_FORK) | |
2573 | { | |
2574 | second_pid = 0; | |
2575 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
2576 | if (ret == 0 && second_pid != 0) | |
2577 | { | |
2578 | int second_status; | |
2579 | ||
2580 | linux_supports_tracefork_flag = 1; | |
2581 | my_waitpid (second_pid, &second_status, 0); | |
2582 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
2583 | if (ret != 0) | |
2584 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
2585 | my_waitpid (second_pid, &status, 0); | |
2586 | } | |
2587 | } | |
2588 | else | |
2589 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
2590 | "(%d, status 0x%x)", ret, status); | |
2591 | ||
2592 | do | |
2593 | { | |
2594 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
2595 | if (ret != 0) | |
2596 | warning ("linux_test_for_tracefork: failed to kill child"); | |
2597 | my_waitpid (child_pid, &status, 0); | |
2598 | } | |
2599 | while (WIFSTOPPED (status)); | |
51c2684e DJ |
2600 | |
2601 | free (stack); | |
24a09b5f DJ |
2602 | } |
2603 | ||
2604 | ||
2f2893d9 DJ |
2605 | static void |
2606 | linux_look_up_symbols (void) | |
2607 | { | |
0d62e5e8 | 2608 | #ifdef USE_THREAD_DB |
95954743 PA |
2609 | struct process_info *proc = current_process (); |
2610 | ||
2611 | if (proc->private->thread_db_active) | |
0d62e5e8 DJ |
2612 | return; |
2613 | ||
95954743 PA |
2614 | proc->private->thread_db_active |
2615 | = thread_db_init (!linux_supports_tracefork_flag); | |
0d62e5e8 DJ |
2616 | #endif |
2617 | } | |
2618 | ||
e5379b03 | 2619 | static void |
ef57601b | 2620 | linux_request_interrupt (void) |
e5379b03 | 2621 | { |
a1928bad | 2622 | extern unsigned long signal_pid; |
e5379b03 | 2623 | |
95954743 PA |
2624 | if (!ptid_equal (cont_thread, null_ptid) |
2625 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 2626 | { |
54a0b537 | 2627 | struct lwp_info *lwp; |
bd99dc85 | 2628 | int lwpid; |
e5379b03 | 2629 | |
54a0b537 | 2630 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
2631 | lwpid = lwpid_of (lwp); |
2632 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
2633 | } |
2634 | else | |
ef57601b | 2635 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
2636 | } |
2637 | ||
aa691b87 RM |
2638 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
2639 | to debugger memory starting at MYADDR. */ | |
2640 | ||
2641 | static int | |
f450004a | 2642 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
2643 | { |
2644 | char filename[PATH_MAX]; | |
2645 | int fd, n; | |
95954743 | 2646 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 2647 | |
95954743 | 2648 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
2649 | |
2650 | fd = open (filename, O_RDONLY); | |
2651 | if (fd < 0) | |
2652 | return -1; | |
2653 | ||
2654 | if (offset != (CORE_ADDR) 0 | |
2655 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
2656 | n = -1; | |
2657 | else | |
2658 | n = read (fd, myaddr, len); | |
2659 | ||
2660 | close (fd); | |
2661 | ||
2662 | return n; | |
2663 | } | |
2664 | ||
e013ee27 OF |
2665 | /* These watchpoint related wrapper functions simply pass on the function call |
2666 | if the target has registered a corresponding function. */ | |
2667 | ||
2668 | static int | |
2669 | linux_insert_watchpoint (char type, CORE_ADDR addr, int len) | |
2670 | { | |
2671 | if (the_low_target.insert_watchpoint != NULL) | |
2672 | return the_low_target.insert_watchpoint (type, addr, len); | |
2673 | else | |
2674 | /* Unsupported (see target.h). */ | |
2675 | return 1; | |
2676 | } | |
2677 | ||
2678 | static int | |
2679 | linux_remove_watchpoint (char type, CORE_ADDR addr, int len) | |
2680 | { | |
2681 | if (the_low_target.remove_watchpoint != NULL) | |
2682 | return the_low_target.remove_watchpoint (type, addr, len); | |
2683 | else | |
2684 | /* Unsupported (see target.h). */ | |
2685 | return 1; | |
2686 | } | |
2687 | ||
2688 | static int | |
2689 | linux_stopped_by_watchpoint (void) | |
2690 | { | |
2691 | if (the_low_target.stopped_by_watchpoint != NULL) | |
2692 | return the_low_target.stopped_by_watchpoint (); | |
2693 | else | |
2694 | return 0; | |
2695 | } | |
2696 | ||
2697 | static CORE_ADDR | |
2698 | linux_stopped_data_address (void) | |
2699 | { | |
2700 | if (the_low_target.stopped_data_address != NULL) | |
2701 | return the_low_target.stopped_data_address (); | |
2702 | else | |
2703 | return 0; | |
2704 | } | |
2705 | ||
42c81e2a | 2706 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
2707 | #if defined(__mcoldfire__) |
2708 | /* These should really be defined in the kernel's ptrace.h header. */ | |
2709 | #define PT_TEXT_ADDR 49*4 | |
2710 | #define PT_DATA_ADDR 50*4 | |
2711 | #define PT_TEXT_END_ADDR 51*4 | |
2712 | #endif | |
2713 | ||
2714 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
2715 | to tell gdb about. */ | |
2716 | ||
2717 | static int | |
2718 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
2719 | { | |
2720 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
2721 | unsigned long text, text_end, data; | |
bd99dc85 | 2722 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
2723 | |
2724 | errno = 0; | |
2725 | ||
2726 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
2727 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
2728 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
2729 | ||
2730 | if (errno == 0) | |
2731 | { | |
2732 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
2733 | used by gdb) are relative to the beginning of the program, |
2734 | with the data segment immediately following the text segment. | |
2735 | However, the actual runtime layout in memory may put the data | |
2736 | somewhere else, so when we send gdb a data base-address, we | |
2737 | use the real data base address and subtract the compile-time | |
2738 | data base-address from it (which is just the length of the | |
2739 | text segment). BSS immediately follows data in both | |
2740 | cases. */ | |
52fb6437 NS |
2741 | *text_p = text; |
2742 | *data_p = data - (text_end - text); | |
1b3f6016 | 2743 | |
52fb6437 NS |
2744 | return 1; |
2745 | } | |
2746 | #endif | |
2747 | return 0; | |
2748 | } | |
2749 | #endif | |
2750 | ||
07e059b5 VP |
2751 | static int |
2752 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
2753 | unsigned char *readbuf, unsigned const char *writebuf, |
2754 | CORE_ADDR offset, int len) | |
07e059b5 VP |
2755 | { |
2756 | /* We make the process list snapshot when the object starts to be | |
2757 | read. */ | |
2758 | static const char *buf; | |
2759 | static long len_avail = -1; | |
2760 | static struct buffer buffer; | |
2761 | ||
2762 | DIR *dirp; | |
2763 | ||
2764 | if (strcmp (annex, "processes") != 0) | |
2765 | return 0; | |
2766 | ||
2767 | if (!readbuf || writebuf) | |
2768 | return 0; | |
2769 | ||
2770 | if (offset == 0) | |
2771 | { | |
2772 | if (len_avail != -1 && len_avail != 0) | |
2773 | buffer_free (&buffer); | |
2774 | len_avail = 0; | |
2775 | buf = NULL; | |
2776 | buffer_init (&buffer); | |
2777 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
2778 | ||
2779 | dirp = opendir ("/proc"); | |
2780 | if (dirp) | |
2781 | { | |
1b3f6016 PA |
2782 | struct dirent *dp; |
2783 | while ((dp = readdir (dirp)) != NULL) | |
2784 | { | |
2785 | struct stat statbuf; | |
2786 | char procentry[sizeof ("/proc/4294967295")]; | |
2787 | ||
2788 | if (!isdigit (dp->d_name[0]) | |
2789 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
2790 | continue; | |
2791 | ||
2792 | sprintf (procentry, "/proc/%s", dp->d_name); | |
2793 | if (stat (procentry, &statbuf) == 0 | |
2794 | && S_ISDIR (statbuf.st_mode)) | |
2795 | { | |
2796 | char pathname[128]; | |
2797 | FILE *f; | |
2798 | char cmd[MAXPATHLEN + 1]; | |
2799 | struct passwd *entry; | |
2800 | ||
2801 | sprintf (pathname, "/proc/%s/cmdline", dp->d_name); | |
2802 | entry = getpwuid (statbuf.st_uid); | |
2803 | ||
2804 | if ((f = fopen (pathname, "r")) != NULL) | |
2805 | { | |
2806 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
2807 | if (len > 0) | |
2808 | { | |
2809 | int i; | |
2810 | for (i = 0; i < len; i++) | |
2811 | if (cmd[i] == '\0') | |
2812 | cmd[i] = ' '; | |
2813 | cmd[len] = '\0'; | |
2814 | ||
2815 | buffer_xml_printf ( | |
07e059b5 VP |
2816 | &buffer, |
2817 | "<item>" | |
2818 | "<column name=\"pid\">%s</column>" | |
2819 | "<column name=\"user\">%s</column>" | |
2820 | "<column name=\"command\">%s</column>" | |
2821 | "</item>", | |
2822 | dp->d_name, | |
2823 | entry ? entry->pw_name : "?", | |
2824 | cmd); | |
1b3f6016 PA |
2825 | } |
2826 | fclose (f); | |
2827 | } | |
2828 | } | |
2829 | } | |
07e059b5 | 2830 | |
1b3f6016 | 2831 | closedir (dirp); |
07e059b5 VP |
2832 | } |
2833 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
2834 | buf = buffer_finish (&buffer); | |
2835 | len_avail = strlen (buf); | |
2836 | } | |
2837 | ||
2838 | if (offset >= len_avail) | |
2839 | { | |
2840 | /* Done. Get rid of the data. */ | |
2841 | buffer_free (&buffer); | |
2842 | buf = NULL; | |
2843 | len_avail = 0; | |
2844 | return 0; | |
2845 | } | |
2846 | ||
2847 | if (len > len_avail - offset) | |
2848 | len = len_avail - offset; | |
2849 | memcpy (readbuf, buf + offset, len); | |
2850 | ||
2851 | return len; | |
2852 | } | |
2853 | ||
d0722149 DE |
2854 | /* Convert a native/host siginfo object, into/from the siginfo in the |
2855 | layout of the inferiors' architecture. */ | |
2856 | ||
2857 | static void | |
2858 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
2859 | { | |
2860 | int done = 0; | |
2861 | ||
2862 | if (the_low_target.siginfo_fixup != NULL) | |
2863 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
2864 | ||
2865 | /* If there was no callback, or the callback didn't do anything, | |
2866 | then just do a straight memcpy. */ | |
2867 | if (!done) | |
2868 | { | |
2869 | if (direction == 1) | |
2870 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
2871 | else | |
2872 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
2873 | } | |
2874 | } | |
2875 | ||
4aa995e1 PA |
2876 | static int |
2877 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
2878 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
2879 | { | |
d0722149 | 2880 | int pid; |
4aa995e1 | 2881 | struct siginfo siginfo; |
d0722149 | 2882 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
2883 | |
2884 | if (current_inferior == NULL) | |
2885 | return -1; | |
2886 | ||
bd99dc85 | 2887 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
2888 | |
2889 | if (debug_threads) | |
d0722149 | 2890 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
2891 | readbuf != NULL ? "Reading" : "Writing", |
2892 | pid); | |
2893 | ||
2894 | if (offset > sizeof (siginfo)) | |
2895 | return -1; | |
2896 | ||
2897 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
2898 | return -1; | |
2899 | ||
d0722149 DE |
2900 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
2901 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
2902 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
2903 | with a 32-bit GDBSERVER, we need to convert it. */ | |
2904 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
2905 | ||
4aa995e1 PA |
2906 | if (offset + len > sizeof (siginfo)) |
2907 | len = sizeof (siginfo) - offset; | |
2908 | ||
2909 | if (readbuf != NULL) | |
d0722149 | 2910 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
2911 | else |
2912 | { | |
d0722149 DE |
2913 | memcpy (inf_siginfo + offset, writebuf, len); |
2914 | ||
2915 | /* Convert back to ptrace layout before flushing it out. */ | |
2916 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
2917 | ||
4aa995e1 PA |
2918 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
2919 | return -1; | |
2920 | } | |
2921 | ||
2922 | return len; | |
2923 | } | |
2924 | ||
bd99dc85 PA |
2925 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
2926 | so we notice when children change state; as the handler for the | |
2927 | sigsuspend in my_waitpid. */ | |
2928 | ||
2929 | static void | |
2930 | sigchld_handler (int signo) | |
2931 | { | |
2932 | int old_errno = errno; | |
2933 | ||
2934 | if (debug_threads) | |
2935 | /* fprintf is not async-signal-safe, so call write directly. */ | |
2936 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
2937 | ||
2938 | if (target_is_async_p ()) | |
2939 | async_file_mark (); /* trigger a linux_wait */ | |
2940 | ||
2941 | errno = old_errno; | |
2942 | } | |
2943 | ||
2944 | static int | |
2945 | linux_supports_non_stop (void) | |
2946 | { | |
2947 | return 1; | |
2948 | } | |
2949 | ||
2950 | static int | |
2951 | linux_async (int enable) | |
2952 | { | |
2953 | int previous = (linux_event_pipe[0] != -1); | |
2954 | ||
2955 | if (previous != enable) | |
2956 | { | |
2957 | sigset_t mask; | |
2958 | sigemptyset (&mask); | |
2959 | sigaddset (&mask, SIGCHLD); | |
2960 | ||
2961 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
2962 | ||
2963 | if (enable) | |
2964 | { | |
2965 | if (pipe (linux_event_pipe) == -1) | |
2966 | fatal ("creating event pipe failed."); | |
2967 | ||
2968 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
2969 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
2970 | ||
2971 | /* Register the event loop handler. */ | |
2972 | add_file_handler (linux_event_pipe[0], | |
2973 | handle_target_event, NULL); | |
2974 | ||
2975 | /* Always trigger a linux_wait. */ | |
2976 | async_file_mark (); | |
2977 | } | |
2978 | else | |
2979 | { | |
2980 | delete_file_handler (linux_event_pipe[0]); | |
2981 | ||
2982 | close (linux_event_pipe[0]); | |
2983 | close (linux_event_pipe[1]); | |
2984 | linux_event_pipe[0] = -1; | |
2985 | linux_event_pipe[1] = -1; | |
2986 | } | |
2987 | ||
2988 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
2989 | } | |
2990 | ||
2991 | return previous; | |
2992 | } | |
2993 | ||
2994 | static int | |
2995 | linux_start_non_stop (int nonstop) | |
2996 | { | |
2997 | /* Register or unregister from event-loop accordingly. */ | |
2998 | linux_async (nonstop); | |
2999 | return 0; | |
3000 | } | |
3001 | ||
ce3a066d DJ |
3002 | static struct target_ops linux_target_ops = { |
3003 | linux_create_inferior, | |
3004 | linux_attach, | |
3005 | linux_kill, | |
6ad8ae5c | 3006 | linux_detach, |
444d6139 | 3007 | linux_join, |
ce3a066d DJ |
3008 | linux_thread_alive, |
3009 | linux_resume, | |
3010 | linux_wait, | |
3011 | linux_fetch_registers, | |
3012 | linux_store_registers, | |
3013 | linux_read_memory, | |
3014 | linux_write_memory, | |
2f2893d9 | 3015 | linux_look_up_symbols, |
ef57601b | 3016 | linux_request_interrupt, |
aa691b87 | 3017 | linux_read_auxv, |
e013ee27 OF |
3018 | linux_insert_watchpoint, |
3019 | linux_remove_watchpoint, | |
3020 | linux_stopped_by_watchpoint, | |
3021 | linux_stopped_data_address, | |
42c81e2a | 3022 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 3023 | linux_read_offsets, |
dae5f5cf DJ |
3024 | #else |
3025 | NULL, | |
3026 | #endif | |
3027 | #ifdef USE_THREAD_DB | |
3028 | thread_db_get_tls_address, | |
3029 | #else | |
3030 | NULL, | |
52fb6437 | 3031 | #endif |
59a016f0 PA |
3032 | NULL, |
3033 | hostio_last_error_from_errno, | |
07e059b5 | 3034 | linux_qxfer_osdata, |
4aa995e1 | 3035 | linux_xfer_siginfo, |
bd99dc85 PA |
3036 | linux_supports_non_stop, |
3037 | linux_async, | |
3038 | linux_start_non_stop, | |
ce3a066d DJ |
3039 | }; |
3040 | ||
0d62e5e8 DJ |
3041 | static void |
3042 | linux_init_signals () | |
3043 | { | |
3044 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
3045 | to find what the cancel signal actually is. */ | |
254787d4 | 3046 | signal (__SIGRTMIN+1, SIG_IGN); |
0d62e5e8 DJ |
3047 | } |
3048 | ||
da6d8c04 DJ |
3049 | void |
3050 | initialize_low (void) | |
3051 | { | |
bd99dc85 PA |
3052 | struct sigaction sigchld_action; |
3053 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 3054 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
3055 | set_breakpoint_data (the_low_target.breakpoint, |
3056 | the_low_target.breakpoint_len); | |
0d62e5e8 | 3057 | linux_init_signals (); |
24a09b5f | 3058 | linux_test_for_tracefork (); |
52fa2412 UW |
3059 | #ifdef HAVE_LINUX_REGSETS |
3060 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
3061 | ; | |
bca929d3 | 3062 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 3063 | #endif |
bd99dc85 PA |
3064 | |
3065 | sigchld_action.sa_handler = sigchld_handler; | |
3066 | sigemptyset (&sigchld_action.sa_mask); | |
3067 | sigchld_action.sa_flags = SA_RESTART; | |
3068 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 3069 | } |