Commit | Line | Data |
---|---|---|
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, |
7b6bb8da | 3 | 2006, 2007, 2008, 2009, 2010, 2011 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" |
d26e3629 | 22 | #include "linux-osdata.h" |
da6d8c04 | 23 | |
58caa3dc | 24 | #include <sys/wait.h> |
da6d8c04 DJ |
25 | #include <stdio.h> |
26 | #include <sys/param.h> | |
da6d8c04 | 27 | #include <sys/ptrace.h> |
af96c192 | 28 | #include "linux-ptrace.h" |
da6d8c04 DJ |
29 | #include <signal.h> |
30 | #include <sys/ioctl.h> | |
31 | #include <fcntl.h> | |
d07c63e7 | 32 | #include <string.h> |
0a30fbc4 DJ |
33 | #include <stdlib.h> |
34 | #include <unistd.h> | |
fa6a77dc | 35 | #include <errno.h> |
fd500816 | 36 | #include <sys/syscall.h> |
f9387fc3 | 37 | #include <sched.h> |
07e059b5 VP |
38 | #include <ctype.h> |
39 | #include <pwd.h> | |
40 | #include <sys/types.h> | |
41 | #include <dirent.h> | |
efcbbd14 UW |
42 | #include <sys/stat.h> |
43 | #include <sys/vfs.h> | |
1570b33e | 44 | #include <sys/uio.h> |
957f3f49 DE |
45 | #ifndef ELFMAG0 |
46 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
47 | then ELFMAG0 will have been defined. If it didn't get included by | |
48 | gdb_proc_service.h then including it will likely introduce a duplicate | |
49 | definition of elf_fpregset_t. */ | |
50 | #include <elf.h> | |
51 | #endif | |
efcbbd14 UW |
52 | |
53 | #ifndef SPUFS_MAGIC | |
54 | #define SPUFS_MAGIC 0x23c9b64e | |
55 | #endif | |
da6d8c04 | 56 | |
fd462a61 DJ |
57 | #ifndef O_LARGEFILE |
58 | #define O_LARGEFILE 0 | |
59 | #endif | |
60 | ||
ec8ebe72 DE |
61 | #ifndef W_STOPCODE |
62 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
63 | #endif | |
64 | ||
1a981360 PA |
65 | /* This is the kernel's hard limit. Not to be confused with |
66 | SIGRTMIN. */ | |
67 | #ifndef __SIGRTMIN | |
68 | #define __SIGRTMIN 32 | |
69 | #endif | |
70 | ||
42c81e2a DJ |
71 | #ifdef __UCLIBC__ |
72 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
73 | #define HAS_NOMMU | |
74 | #endif | |
75 | #endif | |
76 | ||
24a09b5f DJ |
77 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
78 | representation of the thread ID. | |
611cb4a5 | 79 | |
54a0b537 | 80 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
81 | the same as the LWP ID. |
82 | ||
83 | ``all_processes'' is keyed by the "overall process ID", which | |
84 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 85 | |
54a0b537 | 86 | struct inferior_list all_lwps; |
0d62e5e8 | 87 | |
24a09b5f DJ |
88 | /* A list of all unknown processes which receive stop signals. Some other |
89 | process will presumably claim each of these as forked children | |
90 | momentarily. */ | |
91 | ||
92 | struct inferior_list stopped_pids; | |
93 | ||
0d62e5e8 DJ |
94 | /* FIXME this is a bit of a hack, and could be removed. */ |
95 | int stopping_threads; | |
96 | ||
97 | /* FIXME make into a target method? */ | |
24a09b5f | 98 | int using_threads = 1; |
24a09b5f | 99 | |
fa593d66 PA |
100 | /* True if we're presently stabilizing threads (moving them out of |
101 | jump pads). */ | |
102 | static int stabilizing_threads; | |
103 | ||
95954743 PA |
104 | /* This flag is true iff we've just created or attached to our first |
105 | inferior but it has not stopped yet. As soon as it does, we need | |
106 | to call the low target's arch_setup callback. Doing this only on | |
107 | the first inferior avoids reinializing the architecture on every | |
108 | inferior, and avoids messing with the register caches of the | |
109 | already running inferiors. NOTE: this assumes all inferiors under | |
110 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
111 | static int new_inferior; |
112 | ||
2acc282a | 113 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 114 | int step, int signal, siginfo_t *info); |
2bd7c093 | 115 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
116 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
117 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 118 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 119 | static void *add_lwp (ptid_t ptid); |
c35fafde | 120 | static int linux_stopped_by_watchpoint (void); |
95954743 | 121 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 122 | static void proceed_all_lwps (void); |
d50171e4 PA |
123 | static int finish_step_over (struct lwp_info *lwp); |
124 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
125 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 126 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
127 | |
128 | /* True if the low target can hardware single-step. Such targets | |
129 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
130 | ||
131 | static int | |
132 | can_hardware_single_step (void) | |
133 | { | |
134 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
135 | } | |
136 | ||
137 | /* True if the low target supports memory breakpoints. If so, we'll | |
138 | have a GET_PC implementation. */ | |
139 | ||
140 | static int | |
141 | supports_breakpoints (void) | |
142 | { | |
143 | return (the_low_target.get_pc != NULL); | |
144 | } | |
0d62e5e8 | 145 | |
fa593d66 PA |
146 | /* Returns true if this target can support fast tracepoints. This |
147 | does not mean that the in-process agent has been loaded in the | |
148 | inferior. */ | |
149 | ||
150 | static int | |
151 | supports_fast_tracepoints (void) | |
152 | { | |
153 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
154 | } | |
155 | ||
0d62e5e8 DJ |
156 | struct pending_signals |
157 | { | |
158 | int signal; | |
32ca6d61 | 159 | siginfo_t info; |
0d62e5e8 DJ |
160 | struct pending_signals *prev; |
161 | }; | |
611cb4a5 | 162 | |
14ce3065 DE |
163 | #define PTRACE_ARG3_TYPE void * |
164 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 165 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 166 | |
58caa3dc | 167 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
168 | static char *disabled_regsets; |
169 | static int num_regsets; | |
58caa3dc DJ |
170 | #endif |
171 | ||
bd99dc85 PA |
172 | /* The read/write ends of the pipe registered as waitable file in the |
173 | event loop. */ | |
174 | static int linux_event_pipe[2] = { -1, -1 }; | |
175 | ||
176 | /* True if we're currently in async mode. */ | |
177 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
178 | ||
02fc4de7 | 179 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
180 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
181 | ||
d0722149 DE |
182 | /* Accepts an integer PID; Returns a string representing a file that |
183 | can be opened to get info for the child process. | |
184 | Space for the result is malloc'd, caller must free. */ | |
185 | ||
186 | char * | |
187 | linux_child_pid_to_exec_file (int pid) | |
188 | { | |
189 | char *name1, *name2; | |
190 | ||
191 | name1 = xmalloc (MAXPATHLEN); | |
192 | name2 = xmalloc (MAXPATHLEN); | |
193 | memset (name2, 0, MAXPATHLEN); | |
194 | ||
195 | sprintf (name1, "/proc/%d/exe", pid); | |
196 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
197 | { | |
198 | free (name1); | |
199 | return name2; | |
200 | } | |
201 | else | |
202 | { | |
203 | free (name2); | |
204 | return name1; | |
205 | } | |
206 | } | |
207 | ||
208 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
209 | ||
210 | static int | |
957f3f49 | 211 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
212 | { |
213 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
214 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
215 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
216 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
217 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
218 | } | |
219 | ||
220 | /* Return non-zero if FILE is a 64-bit ELF file, | |
221 | zero if the file is not a 64-bit ELF file, | |
222 | and -1 if the file is not accessible or doesn't exist. */ | |
223 | ||
224 | int | |
225 | elf_64_file_p (const char *file) | |
226 | { | |
957f3f49 | 227 | Elf64_Ehdr header; |
d0722149 DE |
228 | int fd; |
229 | ||
230 | fd = open (file, O_RDONLY); | |
231 | if (fd < 0) | |
232 | return -1; | |
233 | ||
234 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
235 | { | |
236 | close (fd); | |
237 | return 0; | |
238 | } | |
239 | close (fd); | |
240 | ||
241 | return elf_64_header_p (&header); | |
242 | } | |
243 | ||
bd99dc85 PA |
244 | static void |
245 | delete_lwp (struct lwp_info *lwp) | |
246 | { | |
247 | remove_thread (get_lwp_thread (lwp)); | |
248 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 249 | free (lwp->arch_private); |
bd99dc85 PA |
250 | free (lwp); |
251 | } | |
252 | ||
95954743 PA |
253 | /* Add a process to the common process list, and set its private |
254 | data. */ | |
255 | ||
256 | static struct process_info * | |
257 | linux_add_process (int pid, int attached) | |
258 | { | |
259 | struct process_info *proc; | |
260 | ||
261 | /* Is this the first process? If so, then set the arch. */ | |
262 | if (all_processes.head == NULL) | |
263 | new_inferior = 1; | |
264 | ||
265 | proc = add_process (pid, attached); | |
266 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
267 | ||
aa5ca48f DE |
268 | if (the_low_target.new_process != NULL) |
269 | proc->private->arch_private = the_low_target.new_process (); | |
270 | ||
95954743 PA |
271 | return proc; |
272 | } | |
273 | ||
07d4f67e DE |
274 | /* Wrapper function for waitpid which handles EINTR, and emulates |
275 | __WALL for systems where that is not available. */ | |
276 | ||
277 | static int | |
278 | my_waitpid (int pid, int *status, int flags) | |
279 | { | |
280 | int ret, out_errno; | |
281 | ||
282 | if (debug_threads) | |
283 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
284 | ||
285 | if (flags & __WALL) | |
286 | { | |
287 | sigset_t block_mask, org_mask, wake_mask; | |
288 | int wnohang; | |
289 | ||
290 | wnohang = (flags & WNOHANG) != 0; | |
291 | flags &= ~(__WALL | __WCLONE); | |
292 | flags |= WNOHANG; | |
293 | ||
294 | /* Block all signals while here. This avoids knowing about | |
295 | LinuxThread's signals. */ | |
296 | sigfillset (&block_mask); | |
297 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
298 | ||
299 | /* ... except during the sigsuspend below. */ | |
300 | sigemptyset (&wake_mask); | |
301 | ||
302 | while (1) | |
303 | { | |
304 | /* Since all signals are blocked, there's no need to check | |
305 | for EINTR here. */ | |
306 | ret = waitpid (pid, status, flags); | |
307 | out_errno = errno; | |
308 | ||
309 | if (ret == -1 && out_errno != ECHILD) | |
310 | break; | |
311 | else if (ret > 0) | |
312 | break; | |
313 | ||
314 | if (flags & __WCLONE) | |
315 | { | |
316 | /* We've tried both flavors now. If WNOHANG is set, | |
317 | there's nothing else to do, just bail out. */ | |
318 | if (wnohang) | |
319 | break; | |
320 | ||
321 | if (debug_threads) | |
322 | fprintf (stderr, "blocking\n"); | |
323 | ||
324 | /* Block waiting for signals. */ | |
325 | sigsuspend (&wake_mask); | |
326 | } | |
327 | ||
328 | flags ^= __WCLONE; | |
329 | } | |
330 | ||
331 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
332 | } | |
333 | else | |
334 | { | |
335 | do | |
336 | ret = waitpid (pid, status, flags); | |
337 | while (ret == -1 && errno == EINTR); | |
338 | out_errno = errno; | |
339 | } | |
340 | ||
341 | if (debug_threads) | |
342 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
343 | pid, flags, status ? *status : -1, ret); | |
344 | ||
345 | errno = out_errno; | |
346 | return ret; | |
347 | } | |
348 | ||
bd99dc85 PA |
349 | /* Handle a GNU/Linux extended wait response. If we see a clone |
350 | event, we need to add the new LWP to our list (and not report the | |
351 | trap to higher layers). */ | |
0d62e5e8 | 352 | |
24a09b5f | 353 | static void |
54a0b537 | 354 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
355 | { |
356 | int event = wstat >> 16; | |
54a0b537 | 357 | struct lwp_info *new_lwp; |
24a09b5f DJ |
358 | |
359 | if (event == PTRACE_EVENT_CLONE) | |
360 | { | |
95954743 | 361 | ptid_t ptid; |
24a09b5f | 362 | unsigned long new_pid; |
836acd6d | 363 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 364 | |
bd99dc85 | 365 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
366 | |
367 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
368 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
369 | { | |
370 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
371 | hits the SIGSTOP, but we're already attached. */ | |
372 | ||
97438e3f | 373 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
374 | |
375 | if (ret == -1) | |
376 | perror_with_name ("waiting for new child"); | |
377 | else if (ret != new_pid) | |
378 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 379 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
380 | warning ("wait returned unexpected status 0x%x", status); |
381 | } | |
382 | ||
1e7fc18c | 383 | linux_enable_event_reporting (new_pid); |
24a09b5f | 384 | |
95954743 PA |
385 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
386 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
387 | add_thread (ptid, new_lwp); | |
24a09b5f | 388 | |
e27d73f6 DE |
389 | /* Either we're going to immediately resume the new thread |
390 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
391 | thinks the thread is currently running, so set this first | |
392 | before calling linux_resume_one_lwp. */ | |
393 | new_lwp->stopped = 1; | |
394 | ||
da5898ce DJ |
395 | /* Normally we will get the pending SIGSTOP. But in some cases |
396 | we might get another signal delivered to the group first. | |
f21cc1a2 | 397 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
398 | if (WSTOPSIG (status) == SIGSTOP) |
399 | { | |
d50171e4 PA |
400 | if (stopping_threads) |
401 | new_lwp->stop_pc = get_stop_pc (new_lwp); | |
402 | else | |
e27d73f6 | 403 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 404 | } |
24a09b5f | 405 | else |
da5898ce | 406 | { |
54a0b537 | 407 | new_lwp->stop_expected = 1; |
d50171e4 | 408 | |
da5898ce DJ |
409 | if (stopping_threads) |
410 | { | |
d50171e4 | 411 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
412 | new_lwp->status_pending_p = 1; |
413 | new_lwp->status_pending = status; | |
da5898ce DJ |
414 | } |
415 | else | |
416 | /* Pass the signal on. This is what GDB does - except | |
417 | shouldn't we really report it instead? */ | |
e27d73f6 | 418 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 419 | } |
24a09b5f DJ |
420 | |
421 | /* Always resume the current thread. If we are stopping | |
422 | threads, it will have a pending SIGSTOP; we may as well | |
423 | collect it now. */ | |
2acc282a | 424 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
425 | } |
426 | } | |
427 | ||
d50171e4 PA |
428 | /* Return the PC as read from the regcache of LWP, without any |
429 | adjustment. */ | |
430 | ||
431 | static CORE_ADDR | |
432 | get_pc (struct lwp_info *lwp) | |
433 | { | |
434 | struct thread_info *saved_inferior; | |
435 | struct regcache *regcache; | |
436 | CORE_ADDR pc; | |
437 | ||
438 | if (the_low_target.get_pc == NULL) | |
439 | return 0; | |
440 | ||
441 | saved_inferior = current_inferior; | |
442 | current_inferior = get_lwp_thread (lwp); | |
443 | ||
444 | regcache = get_thread_regcache (current_inferior, 1); | |
445 | pc = (*the_low_target.get_pc) (regcache); | |
446 | ||
447 | if (debug_threads) | |
448 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
449 | ||
450 | current_inferior = saved_inferior; | |
451 | return pc; | |
452 | } | |
453 | ||
454 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
455 | The SIGTRAP could mean several things. |
456 | ||
457 | On i386, where decr_pc_after_break is non-zero: | |
458 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
459 | we will get only the one SIGTRAP (even if the instruction we | |
460 | stepped over was a breakpoint). The value of $eip will be the | |
461 | next instruction. | |
462 | If we continue the process using PTRACE_CONT, we will get a | |
463 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
464 | the instruction after the breakpoint (i.e. needs to be | |
465 | decremented). If we report the SIGTRAP to GDB, we must also | |
466 | report the undecremented PC. If we cancel the SIGTRAP, we | |
467 | must resume at the decremented PC. | |
468 | ||
469 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
470 | with hardware or kernel single-step: | |
471 | If we single-step over a breakpoint instruction, our PC will | |
472 | point at the following instruction. If we continue and hit a | |
473 | breakpoint instruction, our PC will point at the breakpoint | |
474 | instruction. */ | |
475 | ||
476 | static CORE_ADDR | |
d50171e4 | 477 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 478 | { |
d50171e4 PA |
479 | CORE_ADDR stop_pc; |
480 | ||
481 | if (the_low_target.get_pc == NULL) | |
482 | return 0; | |
0d62e5e8 | 483 | |
d50171e4 PA |
484 | stop_pc = get_pc (lwp); |
485 | ||
bdabb078 PA |
486 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
487 | && !lwp->stepping | |
488 | && !lwp->stopped_by_watchpoint | |
489 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
490 | stop_pc -= the_low_target.decr_pc_after_break; |
491 | ||
492 | if (debug_threads) | |
493 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
494 | ||
495 | return stop_pc; | |
0d62e5e8 | 496 | } |
ce3a066d | 497 | |
0d62e5e8 | 498 | static void * |
95954743 | 499 | add_lwp (ptid_t ptid) |
611cb4a5 | 500 | { |
54a0b537 | 501 | struct lwp_info *lwp; |
0d62e5e8 | 502 | |
54a0b537 PA |
503 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
504 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 505 | |
95954743 | 506 | lwp->head.id = ptid; |
0d62e5e8 | 507 | |
aa5ca48f DE |
508 | if (the_low_target.new_thread != NULL) |
509 | lwp->arch_private = the_low_target.new_thread (); | |
510 | ||
54a0b537 | 511 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 512 | |
54a0b537 | 513 | return lwp; |
0d62e5e8 | 514 | } |
611cb4a5 | 515 | |
da6d8c04 DJ |
516 | /* Start an inferior process and returns its pid. |
517 | ALLARGS is a vector of program-name and args. */ | |
518 | ||
ce3a066d DJ |
519 | static int |
520 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 521 | { |
a6dbe5df | 522 | struct lwp_info *new_lwp; |
da6d8c04 | 523 | int pid; |
95954743 | 524 | ptid_t ptid; |
da6d8c04 | 525 | |
42c81e2a | 526 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
527 | pid = vfork (); |
528 | #else | |
da6d8c04 | 529 | pid = fork (); |
52fb6437 | 530 | #endif |
da6d8c04 DJ |
531 | if (pid < 0) |
532 | perror_with_name ("fork"); | |
533 | ||
534 | if (pid == 0) | |
535 | { | |
536 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
537 | ||
1a981360 | 538 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 539 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 540 | #endif |
0d62e5e8 | 541 | |
a9fa9f7d DJ |
542 | setpgid (0, 0); |
543 | ||
2b876972 DJ |
544 | execv (program, allargs); |
545 | if (errno == ENOENT) | |
546 | execvp (program, allargs); | |
da6d8c04 DJ |
547 | |
548 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 549 | strerror (errno)); |
da6d8c04 DJ |
550 | fflush (stderr); |
551 | _exit (0177); | |
552 | } | |
553 | ||
95954743 PA |
554 | linux_add_process (pid, 0); |
555 | ||
556 | ptid = ptid_build (pid, pid, 0); | |
557 | new_lwp = add_lwp (ptid); | |
558 | add_thread (ptid, new_lwp); | |
a6dbe5df | 559 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 560 | |
a9fa9f7d | 561 | return pid; |
da6d8c04 DJ |
562 | } |
563 | ||
564 | /* Attach to an inferior process. */ | |
565 | ||
95954743 PA |
566 | static void |
567 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 568 | { |
95954743 | 569 | ptid_t ptid; |
54a0b537 | 570 | struct lwp_info *new_lwp; |
611cb4a5 | 571 | |
95954743 | 572 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 573 | { |
95954743 | 574 | if (!initial) |
2d717e4f DJ |
575 | { |
576 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 577 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
578 | strerror (errno), errno); |
579 | fflush (stderr); | |
580 | return; | |
581 | } | |
582 | else | |
583 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 584 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 585 | strerror (errno), errno); |
da6d8c04 DJ |
586 | } |
587 | ||
95954743 PA |
588 | if (initial) |
589 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
590 | ptid = ptid_build (lwpid, lwpid, 0); | |
591 | else | |
592 | { | |
593 | /* Note that extracting the pid from the current inferior is | |
594 | safe, since we're always called in the context of the same | |
595 | process as this new thread. */ | |
596 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
597 | ptid = ptid_build (pid, lwpid, 0); | |
598 | } | |
24a09b5f | 599 | |
95954743 PA |
600 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
601 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 602 | |
a6dbe5df PA |
603 | /* We need to wait for SIGSTOP before being able to make the next |
604 | ptrace call on this LWP. */ | |
605 | new_lwp->must_set_ptrace_flags = 1; | |
606 | ||
0d62e5e8 | 607 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
608 | brings it to a halt. |
609 | ||
610 | There are several cases to consider here: | |
611 | ||
612 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 613 | of a new thread that is being created. |
d50171e4 PA |
614 | In this case we should ignore that SIGSTOP and resume the |
615 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 616 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 617 | resume_continue. |
0e21c1ec DE |
618 | |
619 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
620 | to it via attach_inferior. |
621 | In this case we want the process thread to stop. | |
d50171e4 PA |
622 | This is handled by having linux_attach set last_resume_kind == |
623 | resume_stop after we return. | |
1b3f6016 PA |
624 | ??? If the process already has several threads we leave the other |
625 | threads running. | |
0e21c1ec DE |
626 | |
627 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
628 | existing threads. |
629 | In this case we want the thread to stop. | |
630 | FIXME: This case is currently not properly handled. | |
631 | We should wait for the SIGSTOP but don't. Things work apparently | |
632 | because enough time passes between when we ptrace (ATTACH) and when | |
633 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
634 | |
635 | On the other hand, if we are currently trying to stop all threads, we | |
636 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 637 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
638 | end of the list, and so the new thread has not yet reached |
639 | wait_for_sigstop (but will). */ | |
d50171e4 | 640 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
641 | } |
642 | ||
95954743 PA |
643 | void |
644 | linux_attach_lwp (unsigned long lwpid) | |
645 | { | |
646 | linux_attach_lwp_1 (lwpid, 0); | |
647 | } | |
648 | ||
0d62e5e8 | 649 | int |
a1928bad | 650 | linux_attach (unsigned long pid) |
0d62e5e8 | 651 | { |
95954743 | 652 | linux_attach_lwp_1 (pid, 1); |
95954743 | 653 | linux_add_process (pid, 1); |
0d62e5e8 | 654 | |
bd99dc85 PA |
655 | if (!non_stop) |
656 | { | |
8336d594 PA |
657 | struct thread_info *thread; |
658 | ||
659 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
660 | process. It will be collected by wait shortly. */ | |
661 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
662 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 663 | } |
0d62e5e8 | 664 | |
95954743 PA |
665 | return 0; |
666 | } | |
667 | ||
668 | struct counter | |
669 | { | |
670 | int pid; | |
671 | int count; | |
672 | }; | |
673 | ||
674 | static int | |
675 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
676 | { | |
677 | struct counter *counter = args; | |
678 | ||
679 | if (ptid_get_pid (entry->id) == counter->pid) | |
680 | { | |
681 | if (++counter->count > 1) | |
682 | return 1; | |
683 | } | |
d61ddec4 | 684 | |
da6d8c04 DJ |
685 | return 0; |
686 | } | |
687 | ||
95954743 PA |
688 | static int |
689 | last_thread_of_process_p (struct thread_info *thread) | |
690 | { | |
691 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
692 | int pid = ptid_get_pid (ptid); | |
693 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 694 | |
95954743 PA |
695 | return (find_inferior (&all_threads, |
696 | second_thread_of_pid_p, &counter) == NULL); | |
697 | } | |
698 | ||
699 | /* Kill the inferior lwp. */ | |
700 | ||
701 | static int | |
702 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 703 | { |
0d62e5e8 | 704 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 705 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 706 | int wstat; |
95954743 PA |
707 | int pid = * (int *) args; |
708 | ||
709 | if (ptid_get_pid (entry->id) != pid) | |
710 | return 0; | |
0d62e5e8 | 711 | |
fd500816 DJ |
712 | /* We avoid killing the first thread here, because of a Linux kernel (at |
713 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
714 | the children get a chance to be reaped, it will remain a zombie | |
715 | forever. */ | |
95954743 | 716 | |
12b42a12 | 717 | if (lwpid_of (lwp) == pid) |
95954743 PA |
718 | { |
719 | if (debug_threads) | |
720 | fprintf (stderr, "lkop: is last of process %s\n", | |
721 | target_pid_to_str (entry->id)); | |
722 | return 0; | |
723 | } | |
fd500816 | 724 | |
0d62e5e8 DJ |
725 | do |
726 | { | |
bd99dc85 | 727 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
728 | |
729 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 730 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 731 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
732 | |
733 | return 0; | |
da6d8c04 DJ |
734 | } |
735 | ||
95954743 PA |
736 | static int |
737 | linux_kill (int pid) | |
0d62e5e8 | 738 | { |
95954743 | 739 | struct process_info *process; |
54a0b537 | 740 | struct lwp_info *lwp; |
fd500816 | 741 | int wstat; |
95954743 | 742 | int lwpid; |
fd500816 | 743 | |
95954743 PA |
744 | process = find_process_pid (pid); |
745 | if (process == NULL) | |
746 | return -1; | |
9d606399 | 747 | |
f9e39928 PA |
748 | /* If we're killing a running inferior, make sure it is stopped |
749 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 750 | stop_all_lwps (0, NULL); |
f9e39928 | 751 | |
95954743 | 752 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 753 | |
54a0b537 | 754 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 755 | thread in the list, so do so now. */ |
95954743 | 756 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 PA |
757 | |
758 | if (debug_threads) | |
95954743 PA |
759 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
760 | lwpid_of (lwp), pid); | |
bd99dc85 | 761 | |
fd500816 DJ |
762 | do |
763 | { | |
bd99dc85 | 764 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
765 | |
766 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
767 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
768 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 769 | |
8336d594 | 770 | the_target->mourn (process); |
f9e39928 PA |
771 | |
772 | /* Since we presently can only stop all lwps of all processes, we | |
773 | need to unstop lwps of other processes. */ | |
7984d532 | 774 | unstop_all_lwps (0, NULL); |
95954743 | 775 | return 0; |
0d62e5e8 DJ |
776 | } |
777 | ||
95954743 PA |
778 | static int |
779 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
780 | { |
781 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 782 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
783 | int pid = * (int *) args; |
784 | ||
785 | if (ptid_get_pid (entry->id) != pid) | |
786 | return 0; | |
6ad8ae5c | 787 | |
ae13219e DJ |
788 | /* If this process is stopped but is expecting a SIGSTOP, then make |
789 | sure we take care of that now. This isn't absolutely guaranteed | |
790 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 791 | if (lwp->stop_expected) |
ae13219e | 792 | { |
bd99dc85 | 793 | int wstat; |
ae13219e | 794 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 | 795 | lwp->stop_expected = 0; |
f9e39928 | 796 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 797 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
798 | } |
799 | ||
800 | /* Flush any pending changes to the process's registers. */ | |
801 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 802 | get_lwp_thread (lwp)); |
ae13219e DJ |
803 | |
804 | /* Finally, let it resume. */ | |
bd99dc85 PA |
805 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
806 | ||
807 | delete_lwp (lwp); | |
95954743 | 808 | return 0; |
6ad8ae5c DJ |
809 | } |
810 | ||
95954743 PA |
811 | static int |
812 | linux_detach (int pid) | |
813 | { | |
814 | struct process_info *process; | |
815 | ||
816 | process = find_process_pid (pid); | |
817 | if (process == NULL) | |
818 | return -1; | |
819 | ||
f9e39928 PA |
820 | /* Stop all threads before detaching. First, ptrace requires that |
821 | the thread is stopped to sucessfully detach. Second, thread_db | |
822 | may need to uninstall thread event breakpoints from memory, which | |
823 | only works with a stopped process anyway. */ | |
7984d532 | 824 | stop_all_lwps (0, NULL); |
f9e39928 | 825 | |
ca5c370d | 826 | #ifdef USE_THREAD_DB |
8336d594 | 827 | thread_db_detach (process); |
ca5c370d PA |
828 | #endif |
829 | ||
fa593d66 PA |
830 | /* Stabilize threads (move out of jump pads). */ |
831 | stabilize_threads (); | |
832 | ||
95954743 | 833 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
834 | |
835 | the_target->mourn (process); | |
f9e39928 PA |
836 | |
837 | /* Since we presently can only stop all lwps of all processes, we | |
838 | need to unstop lwps of other processes. */ | |
7984d532 | 839 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
840 | return 0; |
841 | } | |
842 | ||
843 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
844 | ||
845 | static int | |
846 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
847 | { | |
848 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
849 | struct process_info *process = proc; | |
850 | ||
851 | if (pid_of (lwp) == pid_of (process)) | |
852 | delete_lwp (lwp); | |
853 | ||
dd6953e1 | 854 | return 0; |
6ad8ae5c DJ |
855 | } |
856 | ||
8336d594 PA |
857 | static void |
858 | linux_mourn (struct process_info *process) | |
859 | { | |
860 | struct process_info_private *priv; | |
861 | ||
862 | #ifdef USE_THREAD_DB | |
863 | thread_db_mourn (process); | |
864 | #endif | |
865 | ||
f9e39928 PA |
866 | find_inferior (&all_lwps, delete_lwp_callback, process); |
867 | ||
8336d594 PA |
868 | /* Freeing all private data. */ |
869 | priv = process->private; | |
870 | free (priv->arch_private); | |
871 | free (priv); | |
872 | process->private = NULL; | |
505106cd PA |
873 | |
874 | remove_process (process); | |
8336d594 PA |
875 | } |
876 | ||
444d6139 | 877 | static void |
95954743 | 878 | linux_join (int pid) |
444d6139 | 879 | { |
444d6139 PA |
880 | int status, ret; |
881 | ||
882 | do { | |
95954743 | 883 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
884 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
885 | break; | |
886 | } while (ret != -1 || errno != ECHILD); | |
887 | } | |
888 | ||
6ad8ae5c | 889 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 890 | static int |
95954743 | 891 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 892 | { |
95954743 PA |
893 | struct lwp_info *lwp = find_lwp_pid (ptid); |
894 | ||
895 | /* We assume we always know if a thread exits. If a whole process | |
896 | exited but we still haven't been able to report it to GDB, we'll | |
897 | hold on to the last lwp of the dead process. */ | |
898 | if (lwp != NULL) | |
899 | return !lwp->dead; | |
0d62e5e8 DJ |
900 | else |
901 | return 0; | |
902 | } | |
903 | ||
6bf5e0ba | 904 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 905 | static int |
d50171e4 | 906 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 907 | { |
54a0b537 | 908 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 909 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 910 | struct thread_info *thread; |
95954743 PA |
911 | |
912 | /* Check if we're only interested in events from a specific process | |
913 | or its lwps. */ | |
914 | if (!ptid_equal (minus_one_ptid, ptid) | |
915 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
916 | return 0; | |
0d62e5e8 | 917 | |
d50171e4 PA |
918 | thread = get_lwp_thread (lwp); |
919 | ||
920 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
921 | report any status pending the LWP may have. */ | |
8336d594 | 922 | if (thread->last_resume_kind == resume_stop |
7984d532 | 923 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 924 | return 0; |
0d62e5e8 | 925 | |
d50171e4 | 926 | return lwp->status_pending_p; |
0d62e5e8 DJ |
927 | } |
928 | ||
95954743 PA |
929 | static int |
930 | same_lwp (struct inferior_list_entry *entry, void *data) | |
931 | { | |
932 | ptid_t ptid = *(ptid_t *) data; | |
933 | int lwp; | |
934 | ||
935 | if (ptid_get_lwp (ptid) != 0) | |
936 | lwp = ptid_get_lwp (ptid); | |
937 | else | |
938 | lwp = ptid_get_pid (ptid); | |
939 | ||
940 | if (ptid_get_lwp (entry->id) == lwp) | |
941 | return 1; | |
942 | ||
943 | return 0; | |
944 | } | |
945 | ||
946 | struct lwp_info * | |
947 | find_lwp_pid (ptid_t ptid) | |
948 | { | |
949 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
950 | } | |
951 | ||
bd99dc85 | 952 | static struct lwp_info * |
95954743 | 953 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 954 | { |
0d62e5e8 | 955 | int ret; |
95954743 | 956 | int to_wait_for = -1; |
bd99dc85 | 957 | struct lwp_info *child = NULL; |
0d62e5e8 | 958 | |
bd99dc85 | 959 | if (debug_threads) |
95954743 PA |
960 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
961 | ||
962 | if (ptid_equal (ptid, minus_one_ptid)) | |
963 | to_wait_for = -1; /* any child */ | |
964 | else | |
965 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 966 | |
bd99dc85 | 967 | options |= __WALL; |
0d62e5e8 | 968 | |
bd99dc85 | 969 | retry: |
0d62e5e8 | 970 | |
bd99dc85 PA |
971 | ret = my_waitpid (to_wait_for, wstatp, options); |
972 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
973 | return NULL; | |
974 | else if (ret == -1) | |
975 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
976 | |
977 | if (debug_threads | |
978 | && (!WIFSTOPPED (*wstatp) | |
979 | || (WSTOPSIG (*wstatp) != 32 | |
980 | && WSTOPSIG (*wstatp) != 33))) | |
981 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
982 | ||
95954743 | 983 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 984 | |
24a09b5f DJ |
985 | /* If we didn't find a process, one of two things presumably happened: |
986 | - A process we started and then detached from has exited. Ignore it. | |
987 | - A process we are controlling has forked and the new child's stop | |
988 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 989 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
990 | { |
991 | add_pid_to_list (&stopped_pids, ret); | |
992 | goto retry; | |
993 | } | |
bd99dc85 | 994 | else if (child == NULL) |
24a09b5f DJ |
995 | goto retry; |
996 | ||
bd99dc85 | 997 | child->stopped = 1; |
0d62e5e8 | 998 | |
bd99dc85 | 999 | child->last_status = *wstatp; |
32ca6d61 | 1000 | |
d61ddec4 UW |
1001 | /* Architecture-specific setup after inferior is running. |
1002 | This needs to happen after we have attached to the inferior | |
1003 | and it is stopped for the first time, but before we access | |
1004 | any inferior registers. */ | |
1005 | if (new_inferior) | |
1006 | { | |
1007 | the_low_target.arch_setup (); | |
52fa2412 UW |
1008 | #ifdef HAVE_LINUX_REGSETS |
1009 | memset (disabled_regsets, 0, num_regsets); | |
1010 | #endif | |
d61ddec4 UW |
1011 | new_inferior = 0; |
1012 | } | |
1013 | ||
c3adc08c PA |
1014 | /* Fetch the possibly triggered data watchpoint info and store it in |
1015 | CHILD. | |
1016 | ||
1017 | On some archs, like x86, that use debug registers to set | |
1018 | watchpoints, it's possible that the way to know which watched | |
1019 | address trapped, is to check the register that is used to select | |
1020 | which address to watch. Problem is, between setting the | |
1021 | watchpoint and reading back which data address trapped, the user | |
1022 | may change the set of watchpoints, and, as a consequence, GDB | |
1023 | changes the debug registers in the inferior. To avoid reading | |
1024 | back a stale stopped-data-address when that happens, we cache in | |
1025 | LP the fact that a watchpoint trapped, and the corresponding data | |
1026 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1027 | changes the debug registers meanwhile, we have the cached data we | |
1028 | can rely on. */ | |
1029 | ||
1030 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1031 | { | |
1032 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1033 | { | |
1034 | child->stopped_by_watchpoint = 0; | |
1035 | } | |
1036 | else | |
1037 | { | |
1038 | struct thread_info *saved_inferior; | |
1039 | ||
1040 | saved_inferior = current_inferior; | |
1041 | current_inferior = get_lwp_thread (child); | |
1042 | ||
1043 | child->stopped_by_watchpoint | |
1044 | = the_low_target.stopped_by_watchpoint (); | |
1045 | ||
1046 | if (child->stopped_by_watchpoint) | |
1047 | { | |
1048 | if (the_low_target.stopped_data_address != NULL) | |
1049 | child->stopped_data_address | |
1050 | = the_low_target.stopped_data_address (); | |
1051 | else | |
1052 | child->stopped_data_address = 0; | |
1053 | } | |
1054 | ||
1055 | current_inferior = saved_inferior; | |
1056 | } | |
1057 | } | |
1058 | ||
d50171e4 PA |
1059 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1060 | architecture being defined already (so that CHILD has a valid | |
1061 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1062 | not). */ | |
1063 | if (WIFSTOPPED (*wstatp)) | |
1064 | child->stop_pc = get_stop_pc (child); | |
1065 | ||
0d62e5e8 | 1066 | if (debug_threads |
47c0c975 DE |
1067 | && WIFSTOPPED (*wstatp) |
1068 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1069 | { |
896c7fbb | 1070 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1071 | struct regcache *regcache; |
47c0c975 DE |
1072 | CORE_ADDR pc; |
1073 | ||
d50171e4 | 1074 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1075 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1076 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1077 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1078 | current_inferior = saved_inferior; |
0d62e5e8 | 1079 | } |
bd99dc85 PA |
1080 | |
1081 | return child; | |
0d62e5e8 | 1082 | } |
611cb4a5 | 1083 | |
219f2f23 PA |
1084 | /* This function should only be called if the LWP got a SIGTRAP. |
1085 | ||
1086 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1087 | event was handled, 0 otherwise. */ | |
1088 | ||
1089 | static int | |
1090 | handle_tracepoints (struct lwp_info *lwp) | |
1091 | { | |
1092 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1093 | int tpoint_related_event = 0; | |
1094 | ||
7984d532 PA |
1095 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1096 | uninsert tracepoints. To do this, we temporarily pause all | |
1097 | threads, unpatch away, and then unpause threads. We need to make | |
1098 | sure the unpausing doesn't resume LWP too. */ | |
1099 | lwp->suspended++; | |
1100 | ||
219f2f23 PA |
1101 | /* And we need to be sure that any all-threads-stopping doesn't try |
1102 | to move threads out of the jump pads, as it could deadlock the | |
1103 | inferior (LWP could be in the jump pad, maybe even holding the | |
1104 | lock.) */ | |
1105 | ||
1106 | /* Do any necessary step collect actions. */ | |
1107 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1108 | ||
fa593d66 PA |
1109 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1110 | ||
219f2f23 PA |
1111 | /* See if we just hit a tracepoint and do its main collect |
1112 | actions. */ | |
1113 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1114 | ||
7984d532 PA |
1115 | lwp->suspended--; |
1116 | ||
1117 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1118 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1119 | |
219f2f23 PA |
1120 | if (tpoint_related_event) |
1121 | { | |
1122 | if (debug_threads) | |
1123 | fprintf (stderr, "got a tracepoint event\n"); | |
1124 | return 1; | |
1125 | } | |
1126 | ||
1127 | return 0; | |
1128 | } | |
1129 | ||
fa593d66 PA |
1130 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1131 | fast tracepoint. */ | |
1132 | ||
1133 | static int | |
1134 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1135 | struct fast_tpoint_collect_status *status) | |
1136 | { | |
1137 | CORE_ADDR thread_area; | |
1138 | ||
1139 | if (the_low_target.get_thread_area == NULL) | |
1140 | return 0; | |
1141 | ||
1142 | /* Get the thread area address. This is used to recognize which | |
1143 | thread is which when tracing with the in-process agent library. | |
1144 | We don't read anything from the address, and treat it as opaque; | |
1145 | it's the address itself that we assume is unique per-thread. */ | |
1146 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1147 | return 0; | |
1148 | ||
1149 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1150 | } | |
1151 | ||
1152 | /* The reason we resume in the caller, is because we want to be able | |
1153 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1154 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1155 | refuses to resume. */ | |
1156 | ||
1157 | static int | |
1158 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1159 | { | |
1160 | struct thread_info *saved_inferior; | |
1161 | ||
1162 | saved_inferior = current_inferior; | |
1163 | current_inferior = get_lwp_thread (lwp); | |
1164 | ||
1165 | if ((wstat == NULL | |
1166 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1167 | && supports_fast_tracepoints () | |
1168 | && in_process_agent_loaded ()) | |
1169 | { | |
1170 | struct fast_tpoint_collect_status status; | |
1171 | int r; | |
1172 | ||
1173 | if (debug_threads) | |
1174 | fprintf (stderr, "\ | |
1175 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1176 | lwpid_of (lwp)); | |
1177 | ||
1178 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1179 | ||
1180 | if (wstat == NULL | |
1181 | || (WSTOPSIG (*wstat) != SIGILL | |
1182 | && WSTOPSIG (*wstat) != SIGFPE | |
1183 | && WSTOPSIG (*wstat) != SIGSEGV | |
1184 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1185 | { | |
1186 | lwp->collecting_fast_tracepoint = r; | |
1187 | ||
1188 | if (r != 0) | |
1189 | { | |
1190 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1191 | { | |
1192 | /* Haven't executed the original instruction yet. | |
1193 | Set breakpoint there, and wait till it's hit, | |
1194 | then single-step until exiting the jump pad. */ | |
1195 | lwp->exit_jump_pad_bkpt | |
1196 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1197 | } | |
1198 | ||
1199 | if (debug_threads) | |
1200 | fprintf (stderr, "\ | |
1201 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1202 | lwpid_of (lwp)); | |
0cccb683 | 1203 | current_inferior = saved_inferior; |
fa593d66 PA |
1204 | |
1205 | return 1; | |
1206 | } | |
1207 | } | |
1208 | else | |
1209 | { | |
1210 | /* If we get a synchronous signal while collecting, *and* | |
1211 | while executing the (relocated) original instruction, | |
1212 | reset the PC to point at the tpoint address, before | |
1213 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1214 | report the signal to GDB, and pray for the best. */ | |
1215 | ||
1216 | lwp->collecting_fast_tracepoint = 0; | |
1217 | ||
1218 | if (r != 0 | |
1219 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1220 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1221 | { | |
1222 | siginfo_t info; | |
1223 | struct regcache *regcache; | |
1224 | ||
1225 | /* The si_addr on a few signals references the address | |
1226 | of the faulting instruction. Adjust that as | |
1227 | well. */ | |
1228 | if ((WSTOPSIG (*wstat) == SIGILL | |
1229 | || WSTOPSIG (*wstat) == SIGFPE | |
1230 | || WSTOPSIG (*wstat) == SIGBUS | |
1231 | || WSTOPSIG (*wstat) == SIGSEGV) | |
1232 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &info) == 0 | |
1233 | /* Final check just to make sure we don't clobber | |
1234 | the siginfo of non-kernel-sent signals. */ | |
1235 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1236 | { | |
1237 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
1238 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &info); | |
1239 | } | |
1240 | ||
1241 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1242 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1243 | lwp->stop_pc = status.tpoint_addr; | |
1244 | ||
1245 | /* Cancel any fast tracepoint lock this thread was | |
1246 | holding. */ | |
1247 | force_unlock_trace_buffer (); | |
1248 | } | |
1249 | ||
1250 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1251 | { | |
1252 | if (debug_threads) | |
1253 | fprintf (stderr, | |
1254 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1255 | "stopping all threads momentarily.\n"); | |
1256 | ||
1257 | stop_all_lwps (1, lwp); | |
1258 | cancel_breakpoints (); | |
1259 | ||
1260 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1261 | lwp->exit_jump_pad_bkpt = NULL; | |
1262 | ||
1263 | unstop_all_lwps (1, lwp); | |
1264 | ||
1265 | gdb_assert (lwp->suspended >= 0); | |
1266 | } | |
1267 | } | |
1268 | } | |
1269 | ||
1270 | if (debug_threads) | |
1271 | fprintf (stderr, "\ | |
1272 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1273 | lwpid_of (lwp)); | |
0cccb683 YQ |
1274 | |
1275 | current_inferior = saved_inferior; | |
fa593d66 PA |
1276 | return 0; |
1277 | } | |
1278 | ||
1279 | /* Enqueue one signal in the "signals to report later when out of the | |
1280 | jump pad" list. */ | |
1281 | ||
1282 | static void | |
1283 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1284 | { | |
1285 | struct pending_signals *p_sig; | |
1286 | ||
1287 | if (debug_threads) | |
1288 | fprintf (stderr, "\ | |
1289 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1290 | ||
1291 | if (debug_threads) | |
1292 | { | |
1293 | struct pending_signals *sig; | |
1294 | ||
1295 | for (sig = lwp->pending_signals_to_report; | |
1296 | sig != NULL; | |
1297 | sig = sig->prev) | |
1298 | fprintf (stderr, | |
1299 | " Already queued %d\n", | |
1300 | sig->signal); | |
1301 | ||
1302 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1303 | } | |
1304 | ||
1a981360 PA |
1305 | /* Don't enqueue non-RT signals if they are already in the deferred |
1306 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1307 | twice) */ | |
1308 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1309 | { | |
1310 | struct pending_signals *sig; | |
1311 | ||
1312 | for (sig = lwp->pending_signals_to_report; | |
1313 | sig != NULL; | |
1314 | sig = sig->prev) | |
1315 | { | |
1316 | if (sig->signal == WSTOPSIG (*wstat)) | |
1317 | { | |
1318 | if (debug_threads) | |
1319 | fprintf (stderr, | |
1320 | "Not requeuing already queued non-RT signal %d" | |
1321 | " for LWP %ld\n", | |
1322 | sig->signal, | |
1323 | lwpid_of (lwp)); | |
1324 | return; | |
1325 | } | |
1326 | } | |
1327 | } | |
1328 | ||
fa593d66 PA |
1329 | p_sig = xmalloc (sizeof (*p_sig)); |
1330 | p_sig->prev = lwp->pending_signals_to_report; | |
1331 | p_sig->signal = WSTOPSIG (*wstat); | |
1332 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1333 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1334 | ||
1335 | lwp->pending_signals_to_report = p_sig; | |
1336 | } | |
1337 | ||
1338 | /* Dequeue one signal from the "signals to report later when out of | |
1339 | the jump pad" list. */ | |
1340 | ||
1341 | static int | |
1342 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1343 | { | |
1344 | if (lwp->pending_signals_to_report != NULL) | |
1345 | { | |
1346 | struct pending_signals **p_sig; | |
1347 | ||
1348 | p_sig = &lwp->pending_signals_to_report; | |
1349 | while ((*p_sig)->prev != NULL) | |
1350 | p_sig = &(*p_sig)->prev; | |
1351 | ||
1352 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1353 | if ((*p_sig)->info.si_signo != 0) | |
1354 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); | |
1355 | free (*p_sig); | |
1356 | *p_sig = NULL; | |
1357 | ||
1358 | if (debug_threads) | |
1359 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1360 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1361 | ||
1362 | if (debug_threads) | |
1363 | { | |
1364 | struct pending_signals *sig; | |
1365 | ||
1366 | for (sig = lwp->pending_signals_to_report; | |
1367 | sig != NULL; | |
1368 | sig = sig->prev) | |
1369 | fprintf (stderr, | |
1370 | " Still queued %d\n", | |
1371 | sig->signal); | |
1372 | ||
1373 | fprintf (stderr, " (no more queued signals)\n"); | |
1374 | } | |
1375 | ||
1376 | return 1; | |
1377 | } | |
1378 | ||
1379 | return 0; | |
1380 | } | |
1381 | ||
d50171e4 PA |
1382 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1383 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1384 | will handle the current event, eventually we will resume this LWP, | |
1385 | and this breakpoint will trap again. */ | |
1386 | ||
1387 | static int | |
1388 | cancel_breakpoint (struct lwp_info *lwp) | |
1389 | { | |
1390 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1391 | |
1392 | /* There's nothing to do if we don't support breakpoints. */ | |
1393 | if (!supports_breakpoints ()) | |
1394 | return 0; | |
1395 | ||
d50171e4 PA |
1396 | /* breakpoint_at reads from current inferior. */ |
1397 | saved_inferior = current_inferior; | |
1398 | current_inferior = get_lwp_thread (lwp); | |
1399 | ||
1400 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1401 | { | |
1402 | if (debug_threads) | |
1403 | fprintf (stderr, | |
1404 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1405 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1406 | |
1407 | /* Back up the PC if necessary. */ | |
1408 | if (the_low_target.decr_pc_after_break) | |
1409 | { | |
1410 | struct regcache *regcache | |
fc7238bb | 1411 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1412 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1413 | } | |
1414 | ||
1415 | current_inferior = saved_inferior; | |
1416 | return 1; | |
1417 | } | |
1418 | else | |
1419 | { | |
1420 | if (debug_threads) | |
1421 | fprintf (stderr, | |
1422 | "CB: No breakpoint found at %s for [%s]\n", | |
1423 | paddress (lwp->stop_pc), | |
fc7238bb | 1424 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1425 | } |
1426 | ||
1427 | current_inferior = saved_inferior; | |
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | /* When the event-loop is doing a step-over, this points at the thread | |
1432 | being stepped. */ | |
1433 | ptid_t step_over_bkpt; | |
1434 | ||
bd99dc85 PA |
1435 | /* Wait for an event from child PID. If PID is -1, wait for any |
1436 | child. Store the stop status through the status pointer WSTAT. | |
1437 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1438 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1439 | the stopped child otherwise. */ | |
1440 | ||
0d62e5e8 | 1441 | static int |
95954743 | 1442 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1443 | { |
d50171e4 PA |
1444 | struct lwp_info *event_child, *requested_child; |
1445 | ||
d50171e4 PA |
1446 | event_child = NULL; |
1447 | requested_child = NULL; | |
0d62e5e8 | 1448 | |
95954743 | 1449 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1450 | |
95954743 PA |
1451 | if (ptid_equal (ptid, minus_one_ptid) |
1452 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1453 | { |
54a0b537 | 1454 | event_child = (struct lwp_info *) |
d50171e4 | 1455 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1456 | if (debug_threads && event_child) |
bd99dc85 | 1457 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1458 | } |
1459 | else | |
1460 | { | |
95954743 | 1461 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1462 | |
fa593d66 PA |
1463 | if (!stopping_threads |
1464 | && requested_child->status_pending_p | |
1465 | && requested_child->collecting_fast_tracepoint) | |
1466 | { | |
1467 | enqueue_one_deferred_signal (requested_child, | |
1468 | &requested_child->status_pending); | |
1469 | requested_child->status_pending_p = 0; | |
1470 | requested_child->status_pending = 0; | |
1471 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1472 | } | |
1473 | ||
1474 | if (requested_child->suspended | |
1475 | && requested_child->status_pending_p) | |
1476 | fatal ("requesting an event out of a suspended child?"); | |
1477 | ||
d50171e4 | 1478 | if (requested_child->status_pending_p) |
bd99dc85 | 1479 | event_child = requested_child; |
0d62e5e8 | 1480 | } |
611cb4a5 | 1481 | |
0d62e5e8 DJ |
1482 | if (event_child != NULL) |
1483 | { | |
bd99dc85 PA |
1484 | if (debug_threads) |
1485 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1486 | lwpid_of (event_child), event_child->status_pending); | |
1487 | *wstat = event_child->status_pending; | |
1488 | event_child->status_pending_p = 0; | |
1489 | event_child->status_pending = 0; | |
1490 | current_inferior = get_lwp_thread (event_child); | |
1491 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1492 | } |
1493 | ||
1494 | /* We only enter this loop if no process has a pending wait status. Thus | |
1495 | any action taken in response to a wait status inside this loop is | |
1496 | responding as soon as we detect the status, not after any pending | |
1497 | events. */ | |
1498 | while (1) | |
1499 | { | |
6bf5e0ba | 1500 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1501 | |
bd99dc85 | 1502 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1503 | { |
1504 | if (debug_threads) | |
1505 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1506 | return 0; | |
1507 | } | |
0d62e5e8 DJ |
1508 | |
1509 | if (event_child == NULL) | |
1510 | error ("event from unknown child"); | |
611cb4a5 | 1511 | |
bd99dc85 | 1512 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1513 | |
89be2091 | 1514 | /* Check for thread exit. */ |
bd99dc85 | 1515 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1516 | { |
89be2091 | 1517 | if (debug_threads) |
95954743 | 1518 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1519 | |
1520 | /* If the last thread is exiting, just return. */ | |
95954743 | 1521 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1522 | { |
1523 | if (debug_threads) | |
95954743 PA |
1524 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1525 | lwpid_of (event_child)); | |
bd99dc85 PA |
1526 | return lwpid_of (event_child); |
1527 | } | |
89be2091 | 1528 | |
bd99dc85 PA |
1529 | if (!non_stop) |
1530 | { | |
1531 | current_inferior = (struct thread_info *) all_threads.head; | |
1532 | if (debug_threads) | |
1533 | fprintf (stderr, "Current inferior is now %ld\n", | |
1534 | lwpid_of (get_thread_lwp (current_inferior))); | |
1535 | } | |
1536 | else | |
1537 | { | |
1538 | current_inferior = NULL; | |
1539 | if (debug_threads) | |
1540 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1541 | } | |
89be2091 DJ |
1542 | |
1543 | /* If we were waiting for this particular child to do something... | |
1544 | well, it did something. */ | |
bd99dc85 | 1545 | if (requested_child != NULL) |
d50171e4 PA |
1546 | { |
1547 | int lwpid = lwpid_of (event_child); | |
1548 | ||
1549 | /* Cancel the step-over operation --- the thread that | |
1550 | started it is gone. */ | |
1551 | if (finish_step_over (event_child)) | |
7984d532 | 1552 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1553 | delete_lwp (event_child); |
1554 | return lwpid; | |
1555 | } | |
1556 | ||
1557 | delete_lwp (event_child); | |
89be2091 DJ |
1558 | |
1559 | /* Wait for a more interesting event. */ | |
1560 | continue; | |
1561 | } | |
1562 | ||
a6dbe5df PA |
1563 | if (event_child->must_set_ptrace_flags) |
1564 | { | |
1e7fc18c | 1565 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1566 | event_child->must_set_ptrace_flags = 0; |
1567 | } | |
1568 | ||
bd99dc85 PA |
1569 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1570 | && *wstat >> 16 != 0) | |
24a09b5f | 1571 | { |
bd99dc85 | 1572 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1573 | continue; |
1574 | } | |
1575 | ||
d50171e4 PA |
1576 | if (WIFSTOPPED (*wstat) |
1577 | && WSTOPSIG (*wstat) == SIGSTOP | |
1578 | && event_child->stop_expected) | |
1579 | { | |
1580 | int should_stop; | |
1581 | ||
1582 | if (debug_threads) | |
1583 | fprintf (stderr, "Expected stop.\n"); | |
1584 | event_child->stop_expected = 0; | |
1585 | ||
8336d594 | 1586 | should_stop = (current_inferior->last_resume_kind == resume_stop |
d50171e4 PA |
1587 | || stopping_threads); |
1588 | ||
1589 | if (!should_stop) | |
1590 | { | |
1591 | linux_resume_one_lwp (event_child, | |
1592 | event_child->stepping, 0, NULL); | |
1593 | continue; | |
1594 | } | |
1595 | } | |
1596 | ||
bd99dc85 | 1597 | return lwpid_of (event_child); |
611cb4a5 | 1598 | } |
0d62e5e8 | 1599 | |
611cb4a5 DJ |
1600 | /* NOTREACHED */ |
1601 | return 0; | |
1602 | } | |
1603 | ||
95954743 PA |
1604 | static int |
1605 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1606 | { | |
1607 | ptid_t wait_ptid; | |
1608 | ||
1609 | if (ptid_is_pid (ptid)) | |
1610 | { | |
1611 | /* A request to wait for a specific tgid. This is not possible | |
1612 | with waitpid, so instead, we wait for any child, and leave | |
1613 | children we're not interested in right now with a pending | |
1614 | status to report later. */ | |
1615 | wait_ptid = minus_one_ptid; | |
1616 | } | |
1617 | else | |
1618 | wait_ptid = ptid; | |
1619 | ||
1620 | while (1) | |
1621 | { | |
1622 | int event_pid; | |
1623 | ||
1624 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1625 | ||
1626 | if (event_pid > 0 | |
1627 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1628 | { | |
493e2a69 MS |
1629 | struct lwp_info *event_child |
1630 | = find_lwp_pid (pid_to_ptid (event_pid)); | |
95954743 PA |
1631 | |
1632 | if (! WIFSTOPPED (*wstat)) | |
1633 | mark_lwp_dead (event_child, *wstat); | |
1634 | else | |
1635 | { | |
1636 | event_child->status_pending_p = 1; | |
1637 | event_child->status_pending = *wstat; | |
1638 | } | |
1639 | } | |
1640 | else | |
1641 | return event_pid; | |
1642 | } | |
1643 | } | |
1644 | ||
6bf5e0ba PA |
1645 | |
1646 | /* Count the LWP's that have had events. */ | |
1647 | ||
1648 | static int | |
1649 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1650 | { | |
1651 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1652 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1653 | int *count = data; |
1654 | ||
1655 | gdb_assert (count != NULL); | |
1656 | ||
1657 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1658 | should be reported to GDB. */ | |
8336d594 PA |
1659 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1660 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
1661 | && lp->status_pending_p |
1662 | && WIFSTOPPED (lp->status_pending) | |
1663 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1664 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1665 | (*count)++; | |
1666 | ||
1667 | return 0; | |
1668 | } | |
1669 | ||
1670 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1671 | ||
1672 | static int | |
1673 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1674 | { | |
1675 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1676 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 1677 | |
8336d594 PA |
1678 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1679 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
1680 | && lp->status_pending_p) |
1681 | return 1; | |
1682 | else | |
1683 | return 0; | |
1684 | } | |
1685 | ||
1686 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1687 | reported to GDB. */ | |
1688 | ||
1689 | static int | |
1690 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1691 | { | |
1692 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1693 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1694 | int *selector = data; |
1695 | ||
1696 | gdb_assert (selector != NULL); | |
1697 | ||
1698 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
1699 | if (thread->last_resume_kind != resume_stop |
1700 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1701 | && lp->status_pending_p |
1702 | && WIFSTOPPED (lp->status_pending) | |
1703 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1704 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1705 | if ((*selector)-- == 0) | |
1706 | return 1; | |
1707 | ||
1708 | return 0; | |
1709 | } | |
1710 | ||
1711 | static int | |
1712 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
1713 | { | |
1714 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1715 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1716 | struct lwp_info *event_lp = data; |
1717 | ||
1718 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1719 | if (lp == event_lp) | |
1720 | return 0; | |
1721 | ||
1722 | /* If a LWP other than the LWP that we're reporting an event for has | |
1723 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1724 | then just arrange for it to hit it again later. We don't keep | |
1725 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1726 | LWP. We will handle the current event, eventually we will resume | |
1727 | all LWPs, and this one will get its breakpoint trap again. | |
1728 | ||
1729 | If we do not do this, then we run the risk that the user will | |
1730 | delete or disable the breakpoint, but the LWP will have already | |
1731 | tripped on it. */ | |
1732 | ||
8336d594 PA |
1733 | if (thread->last_resume_kind != resume_stop |
1734 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1735 | && lp->status_pending_p |
1736 | && WIFSTOPPED (lp->status_pending) | |
1737 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
1738 | && !lp->stepping |
1739 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
1740 | && cancel_breakpoint (lp)) |
1741 | /* Throw away the SIGTRAP. */ | |
1742 | lp->status_pending_p = 0; | |
1743 | ||
1744 | return 0; | |
1745 | } | |
1746 | ||
7984d532 PA |
1747 | static void |
1748 | linux_cancel_breakpoints (void) | |
1749 | { | |
1750 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
1751 | } | |
1752 | ||
6bf5e0ba PA |
1753 | /* Select one LWP out of those that have events pending. */ |
1754 | ||
1755 | static void | |
1756 | select_event_lwp (struct lwp_info **orig_lp) | |
1757 | { | |
1758 | int num_events = 0; | |
1759 | int random_selector; | |
1760 | struct lwp_info *event_lp; | |
1761 | ||
1762 | /* Give preference to any LWP that is being single-stepped. */ | |
1763 | event_lp | |
1764 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1765 | select_singlestep_lwp_callback, NULL); | |
1766 | if (event_lp != NULL) | |
1767 | { | |
1768 | if (debug_threads) | |
1769 | fprintf (stderr, | |
1770 | "SEL: Select single-step %s\n", | |
1771 | target_pid_to_str (ptid_of (event_lp))); | |
1772 | } | |
1773 | else | |
1774 | { | |
1775 | /* No single-stepping LWP. Select one at random, out of those | |
1776 | which have had SIGTRAP events. */ | |
1777 | ||
1778 | /* First see how many SIGTRAP events we have. */ | |
1779 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
1780 | ||
1781 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1782 | random_selector = (int) | |
1783 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1784 | ||
1785 | if (debug_threads && num_events > 1) | |
1786 | fprintf (stderr, | |
1787 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1788 | num_events, random_selector); | |
1789 | ||
1790 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
1791 | select_event_lwp_callback, | |
1792 | &random_selector); | |
1793 | } | |
1794 | ||
1795 | if (event_lp != NULL) | |
1796 | { | |
1797 | /* Switch the event LWP. */ | |
1798 | *orig_lp = event_lp; | |
1799 | } | |
1800 | } | |
1801 | ||
7984d532 PA |
1802 | /* Decrement the suspend count of an LWP. */ |
1803 | ||
1804 | static int | |
1805 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
1806 | { | |
1807 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1808 | ||
1809 | /* Ignore EXCEPT. */ | |
1810 | if (lwp == except) | |
1811 | return 0; | |
1812 | ||
1813 | lwp->suspended--; | |
1814 | ||
1815 | gdb_assert (lwp->suspended >= 0); | |
1816 | return 0; | |
1817 | } | |
1818 | ||
1819 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
1820 | NULL. */ | |
1821 | ||
1822 | static void | |
1823 | unsuspend_all_lwps (struct lwp_info *except) | |
1824 | { | |
1825 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
1826 | } | |
1827 | ||
fa593d66 PA |
1828 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
1829 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
1830 | void *data); | |
1831 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
1832 | static ptid_t linux_wait_1 (ptid_t ptid, | |
1833 | struct target_waitstatus *ourstatus, | |
1834 | int target_options); | |
1835 | ||
1836 | /* Stabilize threads (move out of jump pads). | |
1837 | ||
1838 | If a thread is midway collecting a fast tracepoint, we need to | |
1839 | finish the collection and move it out of the jump pad before | |
1840 | reporting the signal. | |
1841 | ||
1842 | This avoids recursion while collecting (when a signal arrives | |
1843 | midway, and the signal handler itself collects), which would trash | |
1844 | the trace buffer. In case the user set a breakpoint in a signal | |
1845 | handler, this avoids the backtrace showing the jump pad, etc.. | |
1846 | Most importantly, there are certain things we can't do safely if | |
1847 | threads are stopped in a jump pad (or in its callee's). For | |
1848 | example: | |
1849 | ||
1850 | - starting a new trace run. A thread still collecting the | |
1851 | previous run, could trash the trace buffer when resumed. The trace | |
1852 | buffer control structures would have been reset but the thread had | |
1853 | no way to tell. The thread could even midway memcpy'ing to the | |
1854 | buffer, which would mean that when resumed, it would clobber the | |
1855 | trace buffer that had been set for a new run. | |
1856 | ||
1857 | - we can't rewrite/reuse the jump pads for new tracepoints | |
1858 | safely. Say you do tstart while a thread is stopped midway while | |
1859 | collecting. When the thread is later resumed, it finishes the | |
1860 | collection, and returns to the jump pad, to execute the original | |
1861 | instruction that was under the tracepoint jump at the time the | |
1862 | older run had been started. If the jump pad had been rewritten | |
1863 | since for something else in the new run, the thread would now | |
1864 | execute the wrong / random instructions. */ | |
1865 | ||
1866 | static void | |
1867 | linux_stabilize_threads (void) | |
1868 | { | |
1869 | struct thread_info *save_inferior; | |
1870 | struct lwp_info *lwp_stuck; | |
1871 | ||
1872 | lwp_stuck | |
1873 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1874 | stuck_in_jump_pad_callback, NULL); | |
1875 | if (lwp_stuck != NULL) | |
1876 | { | |
b4d51a55 PA |
1877 | if (debug_threads) |
1878 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
1879 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
1880 | return; |
1881 | } | |
1882 | ||
1883 | save_inferior = current_inferior; | |
1884 | ||
1885 | stabilizing_threads = 1; | |
1886 | ||
1887 | /* Kick 'em all. */ | |
1888 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
1889 | ||
1890 | /* Loop until all are stopped out of the jump pads. */ | |
1891 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
1892 | { | |
1893 | struct target_waitstatus ourstatus; | |
1894 | struct lwp_info *lwp; | |
fa593d66 PA |
1895 | int wstat; |
1896 | ||
1897 | /* Note that we go through the full wait even loop. While | |
1898 | moving threads out of jump pad, we need to be able to step | |
1899 | over internal breakpoints and such. */ | |
32fcada3 | 1900 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
1901 | |
1902 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
1903 | { | |
1904 | lwp = get_thread_lwp (current_inferior); | |
1905 | ||
1906 | /* Lock it. */ | |
1907 | lwp->suspended++; | |
1908 | ||
1909 | if (ourstatus.value.sig != TARGET_SIGNAL_0 | |
1910 | || current_inferior->last_resume_kind == resume_stop) | |
1911 | { | |
1912 | wstat = W_STOPCODE (target_signal_to_host (ourstatus.value.sig)); | |
1913 | enqueue_one_deferred_signal (lwp, &wstat); | |
1914 | } | |
1915 | } | |
1916 | } | |
1917 | ||
1918 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
1919 | ||
1920 | stabilizing_threads = 0; | |
1921 | ||
1922 | current_inferior = save_inferior; | |
1923 | ||
b4d51a55 | 1924 | if (debug_threads) |
fa593d66 | 1925 | { |
b4d51a55 PA |
1926 | lwp_stuck |
1927 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1928 | stuck_in_jump_pad_callback, NULL); | |
1929 | if (lwp_stuck != NULL) | |
fa593d66 PA |
1930 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
1931 | lwpid_of (lwp_stuck)); | |
1932 | } | |
1933 | } | |
1934 | ||
0d62e5e8 | 1935 | /* Wait for process, returns status. */ |
da6d8c04 | 1936 | |
95954743 PA |
1937 | static ptid_t |
1938 | linux_wait_1 (ptid_t ptid, | |
1939 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1940 | { |
e5f1222d | 1941 | int w; |
fc7238bb | 1942 | struct lwp_info *event_child; |
bd99dc85 | 1943 | int options; |
bd99dc85 | 1944 | int pid; |
6bf5e0ba PA |
1945 | int step_over_finished; |
1946 | int bp_explains_trap; | |
1947 | int maybe_internal_trap; | |
1948 | int report_to_gdb; | |
219f2f23 | 1949 | int trace_event; |
bd99dc85 PA |
1950 | |
1951 | /* Translate generic target options into linux options. */ | |
1952 | options = __WALL; | |
1953 | if (target_options & TARGET_WNOHANG) | |
1954 | options |= WNOHANG; | |
0d62e5e8 DJ |
1955 | |
1956 | retry: | |
fa593d66 PA |
1957 | bp_explains_trap = 0; |
1958 | trace_event = 0; | |
bd99dc85 PA |
1959 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1960 | ||
0d62e5e8 DJ |
1961 | /* If we were only supposed to resume one thread, only wait for |
1962 | that thread - if it's still alive. If it died, however - which | |
1963 | can happen if we're coming from the thread death case below - | |
1964 | then we need to make sure we restart the other threads. We could | |
1965 | pick a thread at random or restart all; restarting all is less | |
1966 | arbitrary. */ | |
95954743 PA |
1967 | if (!non_stop |
1968 | && !ptid_equal (cont_thread, null_ptid) | |
1969 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1970 | { |
fc7238bb PA |
1971 | struct thread_info *thread; |
1972 | ||
bd99dc85 PA |
1973 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1974 | cont_thread); | |
0d62e5e8 DJ |
1975 | |
1976 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1977 | if (thread == NULL) |
64386c31 DJ |
1978 | { |
1979 | struct thread_resume resume_info; | |
95954743 | 1980 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1981 | resume_info.kind = resume_continue; |
1982 | resume_info.sig = 0; | |
2bd7c093 | 1983 | linux_resume (&resume_info, 1); |
64386c31 | 1984 | } |
bd99dc85 | 1985 | else |
95954743 | 1986 | ptid = cont_thread; |
0d62e5e8 | 1987 | } |
da6d8c04 | 1988 | |
6bf5e0ba PA |
1989 | if (ptid_equal (step_over_bkpt, null_ptid)) |
1990 | pid = linux_wait_for_event (ptid, &w, options); | |
1991 | else | |
1992 | { | |
1993 | if (debug_threads) | |
1994 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
1995 | target_pid_to_str (step_over_bkpt)); | |
1996 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
1997 | } | |
1998 | ||
bd99dc85 | 1999 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2000 | return null_ptid; |
bd99dc85 | 2001 | |
6bf5e0ba | 2002 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2003 | |
0d62e5e8 DJ |
2004 | /* If we are waiting for a particular child, and it exited, |
2005 | linux_wait_for_event will return its exit status. Similarly if | |
2006 | the last child exited. If this is not the last child, however, | |
2007 | do not report it as exited until there is a 'thread exited' response | |
2008 | available in the remote protocol. Instead, just wait for another event. | |
2009 | This should be safe, because if the thread crashed we will already | |
2010 | have reported the termination signal to GDB; that should stop any | |
2011 | in-progress stepping operations, etc. | |
2012 | ||
2013 | Report the exit status of the last thread to exit. This matches | |
2014 | LinuxThreads' behavior. */ | |
2015 | ||
95954743 | 2016 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2017 | { |
bd99dc85 | 2018 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2019 | { |
bd99dc85 PA |
2020 | if (WIFEXITED (w)) |
2021 | { | |
2022 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2023 | ourstatus->value.integer = WEXITSTATUS (w); | |
2024 | ||
2025 | if (debug_threads) | |
493e2a69 MS |
2026 | fprintf (stderr, |
2027 | "\nChild exited with retcode = %x \n", | |
2028 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2029 | } |
2030 | else | |
2031 | { | |
2032 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2033 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
2034 | ||
2035 | if (debug_threads) | |
493e2a69 MS |
2036 | fprintf (stderr, |
2037 | "\nChild terminated with signal = %x \n", | |
2038 | WTERMSIG (w)); | |
bd99dc85 PA |
2039 | |
2040 | } | |
5b1c542e | 2041 | |
3e4c1235 | 2042 | return ptid_of (event_child); |
0d62e5e8 | 2043 | } |
da6d8c04 | 2044 | } |
0d62e5e8 | 2045 | else |
da6d8c04 | 2046 | { |
0d62e5e8 DJ |
2047 | if (!WIFSTOPPED (w)) |
2048 | goto retry; | |
da6d8c04 DJ |
2049 | } |
2050 | ||
6bf5e0ba PA |
2051 | /* If this event was not handled before, and is not a SIGTRAP, we |
2052 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2053 | a breakpoint is inserted at the current PC. If this target does | |
2054 | not support internal breakpoints at all, we also report the | |
2055 | SIGTRAP without further processing; it's of no concern to us. */ | |
2056 | maybe_internal_trap | |
2057 | = (supports_breakpoints () | |
2058 | && (WSTOPSIG (w) == SIGTRAP | |
2059 | || ((WSTOPSIG (w) == SIGILL | |
2060 | || WSTOPSIG (w) == SIGSEGV) | |
2061 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2062 | ||
2063 | if (maybe_internal_trap) | |
2064 | { | |
2065 | /* Handle anything that requires bookkeeping before deciding to | |
2066 | report the event or continue waiting. */ | |
2067 | ||
2068 | /* First check if we can explain the SIGTRAP with an internal | |
2069 | breakpoint, or if we should possibly report the event to GDB. | |
2070 | Do this before anything that may remove or insert a | |
2071 | breakpoint. */ | |
2072 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2073 | ||
2074 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2075 | finished. If so, tweak the state machine accordingly, | |
2076 | reinsert breakpoints and delete any reinsert (software | |
2077 | single-step) breakpoints. */ | |
2078 | step_over_finished = finish_step_over (event_child); | |
2079 | ||
2080 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2081 | check_breakpoints (event_child->stop_pc); | |
2082 | ||
219f2f23 PA |
2083 | /* Handle tracepoint data collecting. This may overflow the |
2084 | trace buffer, and cause a tracing stop, removing | |
2085 | breakpoints. */ | |
2086 | trace_event = handle_tracepoints (event_child); | |
2087 | ||
6bf5e0ba PA |
2088 | if (bp_explains_trap) |
2089 | { | |
2090 | /* If we stepped or ran into an internal breakpoint, we've | |
2091 | already handled it. So next time we resume (from this | |
2092 | PC), we should step over it. */ | |
2093 | if (debug_threads) | |
2094 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2095 | ||
8b07ae33 PA |
2096 | if (breakpoint_here (event_child->stop_pc)) |
2097 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2098 | } |
2099 | } | |
2100 | else | |
2101 | { | |
2102 | /* We have some other signal, possibly a step-over dance was in | |
2103 | progress, and it should be cancelled too. */ | |
2104 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2105 | } |
2106 | ||
2107 | /* We have all the data we need. Either report the event to GDB, or | |
2108 | resume threads and keep waiting for more. */ | |
2109 | ||
2110 | /* If we're collecting a fast tracepoint, finish the collection and | |
2111 | move out of the jump pad before delivering a signal. See | |
2112 | linux_stabilize_threads. */ | |
2113 | ||
2114 | if (WIFSTOPPED (w) | |
2115 | && WSTOPSIG (w) != SIGTRAP | |
2116 | && supports_fast_tracepoints () | |
2117 | && in_process_agent_loaded ()) | |
2118 | { | |
2119 | if (debug_threads) | |
2120 | fprintf (stderr, | |
2121 | "Got signal %d for LWP %ld. Check if we need " | |
2122 | "to defer or adjust it.\n", | |
2123 | WSTOPSIG (w), lwpid_of (event_child)); | |
2124 | ||
2125 | /* Allow debugging the jump pad itself. */ | |
2126 | if (current_inferior->last_resume_kind != resume_step | |
2127 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2128 | { | |
2129 | enqueue_one_deferred_signal (event_child, &w); | |
2130 | ||
2131 | if (debug_threads) | |
2132 | fprintf (stderr, | |
2133 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2134 | WSTOPSIG (w), lwpid_of (event_child)); | |
2135 | ||
2136 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2137 | goto retry; | |
2138 | } | |
2139 | } | |
219f2f23 | 2140 | |
fa593d66 PA |
2141 | if (event_child->collecting_fast_tracepoint) |
2142 | { | |
2143 | if (debug_threads) | |
2144 | fprintf (stderr, "\ | |
2145 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2146 | Check if we're already there.\n", | |
2147 | lwpid_of (event_child), | |
2148 | event_child->collecting_fast_tracepoint); | |
2149 | ||
2150 | trace_event = 1; | |
2151 | ||
2152 | event_child->collecting_fast_tracepoint | |
2153 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2154 | ||
2155 | if (event_child->collecting_fast_tracepoint != 1) | |
2156 | { | |
2157 | /* No longer need this breakpoint. */ | |
2158 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2159 | { | |
2160 | if (debug_threads) | |
2161 | fprintf (stderr, | |
2162 | "No longer need exit-jump-pad bkpt; removing it." | |
2163 | "stopping all threads momentarily.\n"); | |
2164 | ||
2165 | /* Other running threads could hit this breakpoint. | |
2166 | We don't handle moribund locations like GDB does, | |
2167 | instead we always pause all threads when removing | |
2168 | breakpoints, so that any step-over or | |
2169 | decr_pc_after_break adjustment is always taken | |
2170 | care of while the breakpoint is still | |
2171 | inserted. */ | |
2172 | stop_all_lwps (1, event_child); | |
2173 | cancel_breakpoints (); | |
2174 | ||
2175 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2176 | event_child->exit_jump_pad_bkpt = NULL; | |
2177 | ||
2178 | unstop_all_lwps (1, event_child); | |
2179 | ||
2180 | gdb_assert (event_child->suspended >= 0); | |
2181 | } | |
2182 | } | |
2183 | ||
2184 | if (event_child->collecting_fast_tracepoint == 0) | |
2185 | { | |
2186 | if (debug_threads) | |
2187 | fprintf (stderr, | |
2188 | "fast tracepoint finished " | |
2189 | "collecting successfully.\n"); | |
2190 | ||
2191 | /* We may have a deferred signal to report. */ | |
2192 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2193 | { | |
2194 | if (debug_threads) | |
2195 | fprintf (stderr, "dequeued one signal.\n"); | |
2196 | } | |
3c11dd79 | 2197 | else |
fa593d66 | 2198 | { |
3c11dd79 PA |
2199 | if (debug_threads) |
2200 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2201 | |
2202 | if (stabilizing_threads) | |
2203 | { | |
2204 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
2205 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2206 | return ptid_of (event_child); | |
2207 | } | |
2208 | } | |
2209 | } | |
6bf5e0ba PA |
2210 | } |
2211 | ||
e471f25b PA |
2212 | /* Check whether GDB would be interested in this event. */ |
2213 | ||
2214 | /* If GDB is not interested in this signal, don't stop other | |
2215 | threads, and don't report it to GDB. Just resume the inferior | |
2216 | right away. We do this for threading-related signals as well as | |
2217 | any that GDB specifically requested we ignore. But never ignore | |
2218 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2219 | stepping - they may require special handling to skip the signal | |
2220 | handler. */ | |
2221 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2222 | thread library? */ | |
2223 | if (WIFSTOPPED (w) | |
2224 | && current_inferior->last_resume_kind != resume_step | |
2225 | && ( | |
1a981360 | 2226 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2227 | (current_process ()->private->thread_db != NULL |
2228 | && (WSTOPSIG (w) == __SIGRTMIN | |
2229 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2230 | || | |
2231 | #endif | |
2232 | (pass_signals[target_signal_from_host (WSTOPSIG (w))] | |
2233 | && !(WSTOPSIG (w) == SIGSTOP | |
2234 | && current_inferior->last_resume_kind == resume_stop)))) | |
2235 | { | |
2236 | siginfo_t info, *info_p; | |
2237 | ||
2238 | if (debug_threads) | |
2239 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2240 | WSTOPSIG (w), lwpid_of (event_child)); | |
2241 | ||
2242 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) | |
2243 | info_p = &info; | |
2244 | else | |
2245 | info_p = NULL; | |
2246 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2247 | WSTOPSIG (w), info_p); | |
2248 | goto retry; | |
2249 | } | |
2250 | ||
2251 | /* If GDB wanted this thread to single step, we always want to | |
2252 | report the SIGTRAP, and let GDB handle it. Watchpoints should | |
2253 | always be reported. So should signals we can't explain. A | |
2254 | SIGTRAP we can't explain could be a GDB breakpoint --- we may or | |
2255 | not support Z0 breakpoints. If we do, we're be able to handle | |
2256 | GDB breakpoints on top of internal breakpoints, by handling the | |
2257 | internal breakpoint and still reporting the event to GDB. If we | |
2258 | don't, we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 2259 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 2260 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 2261 | || event_child->stopped_by_watchpoint |
493e2a69 MS |
2262 | || (!step_over_finished |
2263 | && !bp_explains_trap && !trace_event) | |
8b07ae33 | 2264 | || gdb_breakpoint_here (event_child->stop_pc)); |
6bf5e0ba PA |
2265 | |
2266 | /* We found no reason GDB would want us to stop. We either hit one | |
2267 | of our own breakpoints, or finished an internal step GDB | |
2268 | shouldn't know about. */ | |
2269 | if (!report_to_gdb) | |
2270 | { | |
2271 | if (debug_threads) | |
2272 | { | |
2273 | if (bp_explains_trap) | |
2274 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2275 | if (step_over_finished) | |
2276 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2277 | if (trace_event) |
2278 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
2279 | } |
2280 | ||
2281 | /* We're not reporting this breakpoint to GDB, so apply the | |
2282 | decr_pc_after_break adjustment to the inferior's regcache | |
2283 | ourselves. */ | |
2284 | ||
2285 | if (the_low_target.set_pc != NULL) | |
2286 | { | |
2287 | struct regcache *regcache | |
2288 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2289 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2290 | } | |
2291 | ||
7984d532 PA |
2292 | /* We may have finished stepping over a breakpoint. If so, |
2293 | we've stopped and suspended all LWPs momentarily except the | |
2294 | stepping one. This is where we resume them all again. We're | |
2295 | going to keep waiting, so use proceed, which handles stepping | |
2296 | over the next breakpoint. */ | |
6bf5e0ba PA |
2297 | if (debug_threads) |
2298 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2299 | |
2300 | if (step_over_finished) | |
2301 | unsuspend_all_lwps (event_child); | |
2302 | ||
6bf5e0ba PA |
2303 | proceed_all_lwps (); |
2304 | goto retry; | |
2305 | } | |
2306 | ||
2307 | if (debug_threads) | |
2308 | { | |
8336d594 | 2309 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
2310 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
2311 | if (event_child->stopped_by_watchpoint) | |
2312 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2313 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2314 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2315 | if (debug_threads) |
2316 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2317 | } | |
2318 | ||
2319 | /* Alright, we're going to report a stop. */ | |
2320 | ||
fa593d66 | 2321 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2322 | { |
2323 | /* In all-stop, stop all threads. */ | |
7984d532 | 2324 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2325 | |
2326 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2327 | from among those that have had events. Giving equal priority | |
2328 | to all LWPs that have had events helps prevent | |
2329 | starvation. */ | |
2330 | if (ptid_equal (ptid, minus_one_ptid)) | |
2331 | { | |
2332 | event_child->status_pending_p = 1; | |
2333 | event_child->status_pending = w; | |
2334 | ||
2335 | select_event_lwp (&event_child); | |
2336 | ||
2337 | event_child->status_pending_p = 0; | |
2338 | w = event_child->status_pending; | |
2339 | } | |
2340 | ||
2341 | /* Now that we've selected our final event LWP, cancel any | |
2342 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2343 | See the comment in cancel_breakpoints_callback to find out | |
2344 | why. */ | |
2345 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 PA |
2346 | |
2347 | /* Stabilize threads (move out of jump pads). */ | |
2348 | stabilize_threads (); | |
6bf5e0ba PA |
2349 | } |
2350 | else | |
2351 | { | |
2352 | /* If we just finished a step-over, then all threads had been | |
2353 | momentarily paused. In all-stop, that's fine, we want | |
2354 | threads stopped by now anyway. In non-stop, we need to | |
2355 | re-resume threads that GDB wanted to be running. */ | |
2356 | if (step_over_finished) | |
7984d532 | 2357 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2358 | } |
2359 | ||
5b1c542e | 2360 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2361 | |
8336d594 PA |
2362 | if (current_inferior->last_resume_kind == resume_stop |
2363 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2364 | { |
2365 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2366 | and it stopped cleanly, so report as SIG0. The use of | |
2367 | SIGSTOP is an implementation detail. */ | |
2368 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2369 | } | |
8336d594 PA |
2370 | else if (current_inferior->last_resume_kind == resume_stop |
2371 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2372 | { |
2373 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2374 | but, it stopped for other reasons. */ |
bd99dc85 PA |
2375 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
2376 | } | |
2377 | else | |
2378 | { | |
2379 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
2380 | } | |
2381 | ||
d50171e4 PA |
2382 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2383 | ||
bd99dc85 | 2384 | if (debug_threads) |
95954743 | 2385 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2386 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2387 | ourstatus->kind, |
2388 | ourstatus->value.sig); | |
2389 | ||
6bf5e0ba | 2390 | return ptid_of (event_child); |
bd99dc85 PA |
2391 | } |
2392 | ||
2393 | /* Get rid of any pending event in the pipe. */ | |
2394 | static void | |
2395 | async_file_flush (void) | |
2396 | { | |
2397 | int ret; | |
2398 | char buf; | |
2399 | ||
2400 | do | |
2401 | ret = read (linux_event_pipe[0], &buf, 1); | |
2402 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2403 | } | |
2404 | ||
2405 | /* Put something in the pipe, so the event loop wakes up. */ | |
2406 | static void | |
2407 | async_file_mark (void) | |
2408 | { | |
2409 | int ret; | |
2410 | ||
2411 | async_file_flush (); | |
2412 | ||
2413 | do | |
2414 | ret = write (linux_event_pipe[1], "+", 1); | |
2415 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2416 | ||
2417 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2418 | be awakened anyway. */ | |
2419 | } | |
2420 | ||
95954743 PA |
2421 | static ptid_t |
2422 | linux_wait (ptid_t ptid, | |
2423 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2424 | { |
95954743 | 2425 | ptid_t event_ptid; |
bd99dc85 PA |
2426 | |
2427 | if (debug_threads) | |
95954743 | 2428 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2429 | |
2430 | /* Flush the async file first. */ | |
2431 | if (target_is_async_p ()) | |
2432 | async_file_flush (); | |
2433 | ||
95954743 | 2434 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2435 | |
2436 | /* If at least one stop was reported, there may be more. A single | |
2437 | SIGCHLD can signal more than one child stop. */ | |
2438 | if (target_is_async_p () | |
2439 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2440 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2441 | async_file_mark (); |
2442 | ||
2443 | return event_ptid; | |
da6d8c04 DJ |
2444 | } |
2445 | ||
c5f62d5f | 2446 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2447 | |
2448 | static int | |
a1928bad | 2449 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2450 | { |
c5f62d5f DE |
2451 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2452 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2453 | |
c5f62d5f DE |
2454 | #ifdef __NR_tkill |
2455 | { | |
2456 | static int tkill_failed; | |
fd500816 | 2457 | |
c5f62d5f DE |
2458 | if (!tkill_failed) |
2459 | { | |
2460 | int ret; | |
2461 | ||
2462 | errno = 0; | |
2463 | ret = syscall (__NR_tkill, lwpid, signo); | |
2464 | if (errno != ENOSYS) | |
2465 | return ret; | |
2466 | tkill_failed = 1; | |
2467 | } | |
2468 | } | |
fd500816 DJ |
2469 | #endif |
2470 | ||
2471 | return kill (lwpid, signo); | |
2472 | } | |
2473 | ||
964e4306 PA |
2474 | void |
2475 | linux_stop_lwp (struct lwp_info *lwp) | |
2476 | { | |
2477 | send_sigstop (lwp); | |
2478 | } | |
2479 | ||
0d62e5e8 | 2480 | static void |
02fc4de7 | 2481 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2482 | { |
bd99dc85 | 2483 | int pid; |
0d62e5e8 | 2484 | |
bd99dc85 PA |
2485 | pid = lwpid_of (lwp); |
2486 | ||
0d62e5e8 DJ |
2487 | /* If we already have a pending stop signal for this process, don't |
2488 | send another. */ | |
54a0b537 | 2489 | if (lwp->stop_expected) |
0d62e5e8 | 2490 | { |
ae13219e | 2491 | if (debug_threads) |
bd99dc85 | 2492 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2493 | |
0d62e5e8 DJ |
2494 | return; |
2495 | } | |
2496 | ||
2497 | if (debug_threads) | |
bd99dc85 | 2498 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2499 | |
d50171e4 | 2500 | lwp->stop_expected = 1; |
bd99dc85 | 2501 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2502 | } |
2503 | ||
7984d532 PA |
2504 | static int |
2505 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2506 | { |
2507 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2508 | ||
7984d532 PA |
2509 | /* Ignore EXCEPT. */ |
2510 | if (lwp == except) | |
2511 | return 0; | |
2512 | ||
02fc4de7 | 2513 | if (lwp->stopped) |
7984d532 | 2514 | return 0; |
02fc4de7 PA |
2515 | |
2516 | send_sigstop (lwp); | |
7984d532 PA |
2517 | return 0; |
2518 | } | |
2519 | ||
2520 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2521 | yet. */ | |
2522 | static int | |
2523 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2524 | void *except) | |
2525 | { | |
2526 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2527 | ||
2528 | /* Ignore EXCEPT. */ | |
2529 | if (lwp == except) | |
2530 | return 0; | |
2531 | ||
2532 | lwp->suspended++; | |
2533 | ||
2534 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2535 | } |
2536 | ||
95954743 PA |
2537 | static void |
2538 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2539 | { | |
2540 | /* It's dead, really. */ | |
2541 | lwp->dead = 1; | |
2542 | ||
2543 | /* Store the exit status for later. */ | |
2544 | lwp->status_pending_p = 1; | |
2545 | lwp->status_pending = wstat; | |
2546 | ||
95954743 PA |
2547 | /* Prevent trying to stop it. */ |
2548 | lwp->stopped = 1; | |
2549 | ||
2550 | /* No further stops are expected from a dead lwp. */ | |
2551 | lwp->stop_expected = 0; | |
2552 | } | |
2553 | ||
0d62e5e8 DJ |
2554 | static void |
2555 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2556 | { | |
54a0b537 | 2557 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2558 | struct thread_info *saved_inferior; |
a1928bad | 2559 | int wstat; |
95954743 PA |
2560 | ptid_t saved_tid; |
2561 | ptid_t ptid; | |
d50171e4 | 2562 | int pid; |
0d62e5e8 | 2563 | |
54a0b537 | 2564 | if (lwp->stopped) |
d50171e4 PA |
2565 | { |
2566 | if (debug_threads) | |
2567 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2568 | lwpid_of (lwp)); | |
2569 | return; | |
2570 | } | |
0d62e5e8 DJ |
2571 | |
2572 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2573 | if (saved_inferior != NULL) |
2574 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2575 | else | |
95954743 | 2576 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2577 | |
95954743 | 2578 | ptid = lwp->head.id; |
bd99dc85 | 2579 | |
d50171e4 PA |
2580 | if (debug_threads) |
2581 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2582 | ||
2583 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2584 | |
2585 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2586 | and record the pending SIGSTOP. If the process exited, just | |
2587 | return. */ | |
d50171e4 | 2588 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2589 | { |
2590 | if (debug_threads) | |
d50171e4 PA |
2591 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2592 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2593 | |
d50171e4 | 2594 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2595 | { |
2596 | if (debug_threads) | |
d50171e4 PA |
2597 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2598 | lwpid_of (lwp), wstat); | |
2599 | ||
c35fafde PA |
2600 | lwp->status_pending_p = 1; |
2601 | lwp->status_pending = wstat; | |
2602 | } | |
0d62e5e8 | 2603 | } |
d50171e4 | 2604 | else |
95954743 PA |
2605 | { |
2606 | if (debug_threads) | |
d50171e4 | 2607 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2608 | |
d50171e4 PA |
2609 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2610 | if (lwp) | |
2611 | { | |
2612 | /* Leave this status pending for the next time we're able to | |
2613 | report it. In the mean time, we'll report this lwp as | |
2614 | dead to GDB, so GDB doesn't try to read registers and | |
2615 | memory from it. This can only happen if this was the | |
2616 | last thread of the process; otherwise, PID is removed | |
2617 | from the thread tables before linux_wait_for_event | |
2618 | returns. */ | |
2619 | mark_lwp_dead (lwp, wstat); | |
2620 | } | |
95954743 | 2621 | } |
0d62e5e8 | 2622 | |
bd99dc85 | 2623 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2624 | current_inferior = saved_inferior; |
2625 | else | |
2626 | { | |
2627 | if (debug_threads) | |
2628 | fprintf (stderr, "Previously current thread died.\n"); | |
2629 | ||
bd99dc85 PA |
2630 | if (non_stop) |
2631 | { | |
2632 | /* We can't change the current inferior behind GDB's back, | |
2633 | otherwise, a subsequent command may apply to the wrong | |
2634 | process. */ | |
2635 | current_inferior = NULL; | |
2636 | } | |
2637 | else | |
2638 | { | |
2639 | /* Set a valid thread as current. */ | |
2640 | set_desired_inferior (0); | |
2641 | } | |
0d62e5e8 DJ |
2642 | } |
2643 | } | |
2644 | ||
fa593d66 PA |
2645 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
2646 | move it out, because we need to report the stop event to GDB. For | |
2647 | example, if the user puts a breakpoint in the jump pad, it's | |
2648 | because she wants to debug it. */ | |
2649 | ||
2650 | static int | |
2651 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
2652 | { | |
2653 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2654 | struct thread_info *thread = get_lwp_thread (lwp); | |
2655 | ||
2656 | gdb_assert (lwp->suspended == 0); | |
2657 | gdb_assert (lwp->stopped); | |
2658 | ||
2659 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
2660 | return (supports_fast_tracepoints () | |
2661 | && in_process_agent_loaded () | |
2662 | && (gdb_breakpoint_here (lwp->stop_pc) | |
2663 | || lwp->stopped_by_watchpoint | |
2664 | || thread->last_resume_kind == resume_step) | |
2665 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
2666 | } | |
2667 | ||
2668 | static void | |
2669 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
2670 | { | |
2671 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2672 | struct thread_info *thread = get_lwp_thread (lwp); | |
2673 | int *wstat; | |
2674 | ||
2675 | gdb_assert (lwp->suspended == 0); | |
2676 | gdb_assert (lwp->stopped); | |
2677 | ||
2678 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
2679 | ||
2680 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
2681 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
2682 | && !lwp->stopped_by_watchpoint | |
2683 | && thread->last_resume_kind != resume_step | |
2684 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
2685 | { | |
2686 | if (debug_threads) | |
2687 | fprintf (stderr, | |
2688 | "LWP %ld needs stabilizing (in jump pad)\n", | |
2689 | lwpid_of (lwp)); | |
2690 | ||
2691 | if (wstat) | |
2692 | { | |
2693 | lwp->status_pending_p = 0; | |
2694 | enqueue_one_deferred_signal (lwp, wstat); | |
2695 | ||
2696 | if (debug_threads) | |
2697 | fprintf (stderr, | |
2698 | "Signal %d for LWP %ld deferred " | |
2699 | "(in jump pad)\n", | |
2700 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
2701 | } | |
2702 | ||
2703 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
2704 | } | |
2705 | else | |
2706 | lwp->suspended++; | |
2707 | } | |
2708 | ||
2709 | static int | |
2710 | lwp_running (struct inferior_list_entry *entry, void *data) | |
2711 | { | |
2712 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2713 | ||
2714 | if (lwp->dead) | |
2715 | return 0; | |
2716 | if (lwp->stopped) | |
2717 | return 0; | |
2718 | return 1; | |
2719 | } | |
2720 | ||
7984d532 PA |
2721 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
2722 | If SUSPEND, then also increase the suspend count of every LWP, | |
2723 | except EXCEPT. */ | |
2724 | ||
0d62e5e8 | 2725 | static void |
7984d532 | 2726 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 DJ |
2727 | { |
2728 | stopping_threads = 1; | |
7984d532 PA |
2729 | |
2730 | if (suspend) | |
2731 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
2732 | else | |
2733 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 2734 | for_each_inferior (&all_lwps, wait_for_sigstop); |
0d62e5e8 DJ |
2735 | stopping_threads = 0; |
2736 | } | |
2737 | ||
da6d8c04 DJ |
2738 | /* Resume execution of the inferior process. |
2739 | If STEP is nonzero, single-step it. | |
2740 | If SIGNAL is nonzero, give it that signal. */ | |
2741 | ||
ce3a066d | 2742 | static void |
2acc282a | 2743 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 2744 | int step, int signal, siginfo_t *info) |
da6d8c04 | 2745 | { |
0d62e5e8 | 2746 | struct thread_info *saved_inferior; |
fa593d66 | 2747 | int fast_tp_collecting; |
0d62e5e8 | 2748 | |
54a0b537 | 2749 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
2750 | return; |
2751 | ||
fa593d66 PA |
2752 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
2753 | ||
2754 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
2755 | ||
219f2f23 PA |
2756 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
2757 | user used the "jump" command, or "set $pc = foo"). */ | |
2758 | if (lwp->stop_pc != get_pc (lwp)) | |
2759 | { | |
2760 | /* Collecting 'while-stepping' actions doesn't make sense | |
2761 | anymore. */ | |
2762 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
2763 | } | |
2764 | ||
0d62e5e8 DJ |
2765 | /* If we have pending signals or status, and a new signal, enqueue the |
2766 | signal. Also enqueue the signal if we are waiting to reinsert a | |
2767 | breakpoint; it will be picked up again below. */ | |
2768 | if (signal != 0 | |
fa593d66 PA |
2769 | && (lwp->status_pending_p |
2770 | || lwp->pending_signals != NULL | |
2771 | || lwp->bp_reinsert != 0 | |
2772 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
2773 | { |
2774 | struct pending_signals *p_sig; | |
bca929d3 | 2775 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 2776 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 2777 | p_sig->signal = signal; |
32ca6d61 DJ |
2778 | if (info == NULL) |
2779 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2780 | else | |
2781 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 2782 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
2783 | } |
2784 | ||
d50171e4 PA |
2785 | if (lwp->status_pending_p) |
2786 | { | |
2787 | if (debug_threads) | |
2788 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
2789 | " has pending status\n", | |
2790 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
2791 | lwp->stop_expected ? "expected" : "not expected"); | |
2792 | return; | |
2793 | } | |
0d62e5e8 DJ |
2794 | |
2795 | saved_inferior = current_inferior; | |
54a0b537 | 2796 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
2797 | |
2798 | if (debug_threads) | |
1b3f6016 | 2799 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 2800 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 2801 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
2802 | |
2803 | /* This bit needs some thinking about. If we get a signal that | |
2804 | we must report while a single-step reinsert is still pending, | |
2805 | we often end up resuming the thread. It might be better to | |
2806 | (ew) allow a stack of pending events; then we could be sure that | |
2807 | the reinsert happened right away and not lose any signals. | |
2808 | ||
2809 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 2810 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
2811 | complete correctness, so it won't solve that problem. It may be |
2812 | worthwhile just to solve this one, however. */ | |
54a0b537 | 2813 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
2814 | { |
2815 | if (debug_threads) | |
d50171e4 PA |
2816 | fprintf (stderr, " pending reinsert at 0x%s\n", |
2817 | paddress (lwp->bp_reinsert)); | |
2818 | ||
2819 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
2820 | { | |
fa593d66 PA |
2821 | if (fast_tp_collecting == 0) |
2822 | { | |
2823 | if (step == 0) | |
2824 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
2825 | if (lwp->suspended) | |
2826 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
2827 | lwp->suspended); | |
2828 | } | |
d50171e4 PA |
2829 | |
2830 | step = 1; | |
2831 | } | |
0d62e5e8 DJ |
2832 | |
2833 | /* Postpone any pending signal. It was enqueued above. */ | |
2834 | signal = 0; | |
2835 | } | |
2836 | ||
fa593d66 PA |
2837 | if (fast_tp_collecting == 1) |
2838 | { | |
2839 | if (debug_threads) | |
2840 | fprintf (stderr, "\ | |
2841 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
2842 | lwpid_of (lwp)); | |
2843 | ||
2844 | /* Postpone any pending signal. It was enqueued above. */ | |
2845 | signal = 0; | |
2846 | } | |
2847 | else if (fast_tp_collecting == 2) | |
2848 | { | |
2849 | if (debug_threads) | |
2850 | fprintf (stderr, "\ | |
2851 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
2852 | lwpid_of (lwp)); | |
2853 | ||
2854 | if (can_hardware_single_step ()) | |
2855 | step = 1; | |
2856 | else | |
2857 | fatal ("moving out of jump pad single-stepping" | |
2858 | " not implemented on this target"); | |
2859 | ||
2860 | /* Postpone any pending signal. It was enqueued above. */ | |
2861 | signal = 0; | |
2862 | } | |
2863 | ||
219f2f23 PA |
2864 | /* If we have while-stepping actions in this thread set it stepping. |
2865 | If we have a signal to deliver, it may or may not be set to | |
2866 | SIG_IGN, we don't know. Assume so, and allow collecting | |
2867 | while-stepping into a signal handler. A possible smart thing to | |
2868 | do would be to set an internal breakpoint at the signal return | |
2869 | address, continue, and carry on catching this while-stepping | |
2870 | action only when that breakpoint is hit. A future | |
2871 | enhancement. */ | |
2872 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
2873 | && can_hardware_single_step ()) | |
2874 | { | |
2875 | if (debug_threads) | |
2876 | fprintf (stderr, | |
2877 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
2878 | lwpid_of (lwp)); | |
2879 | step = 1; | |
2880 | } | |
2881 | ||
aa691b87 | 2882 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 2883 | { |
442ea881 PA |
2884 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
2885 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 2886 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
2887 | } |
2888 | ||
fa593d66 PA |
2889 | /* If we have pending signals, consume one unless we are trying to |
2890 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
2891 | collect. */ | |
2892 | if (lwp->pending_signals != NULL | |
2893 | && lwp->bp_reinsert == 0 | |
2894 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
2895 | { |
2896 | struct pending_signals **p_sig; | |
2897 | ||
54a0b537 | 2898 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
2899 | while ((*p_sig)->prev != NULL) |
2900 | p_sig = &(*p_sig)->prev; | |
2901 | ||
2902 | signal = (*p_sig)->signal; | |
32ca6d61 | 2903 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 2904 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 2905 | |
0d62e5e8 DJ |
2906 | free (*p_sig); |
2907 | *p_sig = NULL; | |
2908 | } | |
2909 | ||
aa5ca48f DE |
2910 | if (the_low_target.prepare_to_resume != NULL) |
2911 | the_low_target.prepare_to_resume (lwp); | |
2912 | ||
0d62e5e8 | 2913 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 2914 | get_lwp_thread (lwp)); |
da6d8c04 | 2915 | errno = 0; |
54a0b537 | 2916 | lwp->stopped = 0; |
c3adc08c | 2917 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 2918 | lwp->stepping = step; |
14ce3065 DE |
2919 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
2920 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2921 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2922 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
2923 | |
2924 | current_inferior = saved_inferior; | |
da6d8c04 | 2925 | if (errno) |
3221518c UW |
2926 | { |
2927 | /* ESRCH from ptrace either means that the thread was already | |
2928 | running (an error) or that it is gone (a race condition). If | |
2929 | it's gone, we will get a notification the next time we wait, | |
2930 | so we can ignore the error. We could differentiate these | |
2931 | two, but it's tricky without waiting; the thread still exists | |
2932 | as a zombie, so sending it signal 0 would succeed. So just | |
2933 | ignore ESRCH. */ | |
2934 | if (errno == ESRCH) | |
2935 | return; | |
2936 | ||
2937 | perror_with_name ("ptrace"); | |
2938 | } | |
da6d8c04 DJ |
2939 | } |
2940 | ||
2bd7c093 PA |
2941 | struct thread_resume_array |
2942 | { | |
2943 | struct thread_resume *resume; | |
2944 | size_t n; | |
2945 | }; | |
64386c31 DJ |
2946 | |
2947 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
2948 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
2949 | resume request. | |
2950 | ||
2951 | This algorithm is O(threads * resume elements), but resume elements | |
2952 | is small (and will remain small at least until GDB supports thread | |
2953 | suspension). */ | |
2bd7c093 PA |
2954 | static int |
2955 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 2956 | { |
54a0b537 | 2957 | struct lwp_info *lwp; |
64386c31 | 2958 | struct thread_info *thread; |
5544ad89 | 2959 | int ndx; |
2bd7c093 | 2960 | struct thread_resume_array *r; |
64386c31 DJ |
2961 | |
2962 | thread = (struct thread_info *) entry; | |
54a0b537 | 2963 | lwp = get_thread_lwp (thread); |
2bd7c093 | 2964 | r = arg; |
64386c31 | 2965 | |
2bd7c093 | 2966 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
2967 | { |
2968 | ptid_t ptid = r->resume[ndx].thread; | |
2969 | if (ptid_equal (ptid, minus_one_ptid) | |
2970 | || ptid_equal (ptid, entry->id) | |
2971 | || (ptid_is_pid (ptid) | |
2972 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
2973 | || (ptid_get_lwp (ptid) == -1 | |
2974 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
2975 | { | |
d50171e4 | 2976 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 2977 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
2978 | { |
2979 | if (debug_threads) | |
2980 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
2981 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
2982 | ? "stopped" | |
2983 | : "stopping", | |
2984 | lwpid_of (lwp)); | |
2985 | ||
2986 | continue; | |
2987 | } | |
2988 | ||
95954743 | 2989 | lwp->resume = &r->resume[ndx]; |
8336d594 | 2990 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 PA |
2991 | |
2992 | /* If we had a deferred signal to report, dequeue one now. | |
2993 | This can happen if LWP gets more than one signal while | |
2994 | trying to get out of a jump pad. */ | |
2995 | if (lwp->stopped | |
2996 | && !lwp->status_pending_p | |
2997 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
2998 | { | |
2999 | lwp->status_pending_p = 1; | |
3000 | ||
3001 | if (debug_threads) | |
3002 | fprintf (stderr, | |
3003 | "Dequeueing deferred signal %d for LWP %ld, " | |
3004 | "leaving status pending.\n", | |
3005 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3006 | } | |
3007 | ||
95954743 PA |
3008 | return 0; |
3009 | } | |
3010 | } | |
2bd7c093 PA |
3011 | |
3012 | /* No resume action for this thread. */ | |
3013 | lwp->resume = NULL; | |
64386c31 | 3014 | |
2bd7c093 | 3015 | return 0; |
5544ad89 DJ |
3016 | } |
3017 | ||
5544ad89 | 3018 | |
bd99dc85 PA |
3019 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3020 | static int | |
3021 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3022 | { |
bd99dc85 | 3023 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3024 | |
bd99dc85 PA |
3025 | /* LWPs which will not be resumed are not interesting, because |
3026 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3027 | if (lwp->resume == NULL) |
bd99dc85 | 3028 | return 0; |
64386c31 | 3029 | |
bd99dc85 | 3030 | if (lwp->status_pending_p) |
d50171e4 PA |
3031 | * (int *) flag_p = 1; |
3032 | ||
3033 | return 0; | |
3034 | } | |
3035 | ||
3036 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3037 | internal breakpoint that we need to step over. It assumes that any | |
3038 | required STOP_PC adjustment has already been propagated to the | |
3039 | inferior's regcache. */ | |
3040 | ||
3041 | static int | |
3042 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3043 | { | |
3044 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3045 | struct thread_info *thread; |
d50171e4 PA |
3046 | struct thread_info *saved_inferior; |
3047 | CORE_ADDR pc; | |
3048 | ||
3049 | /* LWPs which will not be resumed are not interesting, because we | |
3050 | might not wait for them next time through linux_wait. */ | |
3051 | ||
3052 | if (!lwp->stopped) | |
3053 | { | |
3054 | if (debug_threads) | |
3055 | fprintf (stderr, | |
3056 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3057 | lwpid_of (lwp)); | |
3058 | return 0; | |
3059 | } | |
3060 | ||
8336d594 PA |
3061 | thread = get_lwp_thread (lwp); |
3062 | ||
3063 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3064 | { |
3065 | if (debug_threads) | |
3066 | fprintf (stderr, | |
3067 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3068 | lwpid_of (lwp)); | |
3069 | return 0; | |
3070 | } | |
3071 | ||
7984d532 PA |
3072 | gdb_assert (lwp->suspended >= 0); |
3073 | ||
3074 | if (lwp->suspended) | |
3075 | { | |
3076 | if (debug_threads) | |
3077 | fprintf (stderr, | |
3078 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3079 | lwpid_of (lwp)); | |
3080 | return 0; | |
3081 | } | |
3082 | ||
d50171e4 PA |
3083 | if (!lwp->need_step_over) |
3084 | { | |
3085 | if (debug_threads) | |
3086 | fprintf (stderr, | |
3087 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3088 | } | |
5544ad89 | 3089 | |
bd99dc85 | 3090 | if (lwp->status_pending_p) |
d50171e4 PA |
3091 | { |
3092 | if (debug_threads) | |
3093 | fprintf (stderr, | |
3094 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3095 | lwpid_of (lwp)); | |
3096 | return 0; | |
3097 | } | |
3098 | ||
3099 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3100 | or we have. */ | |
3101 | pc = get_pc (lwp); | |
3102 | ||
3103 | /* If the PC has changed since we stopped, then don't do anything, | |
3104 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3105 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3106 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3107 | command, or poked thread's registers herself. */ | |
3108 | if (pc != lwp->stop_pc) | |
3109 | { | |
3110 | if (debug_threads) | |
3111 | fprintf (stderr, | |
3112 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3113 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3114 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3115 | ||
3116 | lwp->need_step_over = 0; | |
3117 | return 0; | |
3118 | } | |
3119 | ||
3120 | saved_inferior = current_inferior; | |
8336d594 | 3121 | current_inferior = thread; |
d50171e4 | 3122 | |
8b07ae33 | 3123 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3124 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3125 | { |
8b07ae33 PA |
3126 | /* Don't step over a breakpoint that GDB expects to hit |
3127 | though. */ | |
3128 | if (gdb_breakpoint_here (pc)) | |
3129 | { | |
3130 | if (debug_threads) | |
3131 | fprintf (stderr, | |
3132 | "Need step over [LWP %ld]? yes, but found" | |
3133 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3134 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3135 | |
8b07ae33 PA |
3136 | current_inferior = saved_inferior; |
3137 | return 0; | |
3138 | } | |
3139 | else | |
3140 | { | |
3141 | if (debug_threads) | |
3142 | fprintf (stderr, | |
493e2a69 MS |
3143 | "Need step over [LWP %ld]? yes, " |
3144 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3145 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3146 | |
8b07ae33 PA |
3147 | /* We've found an lwp that needs stepping over --- return 1 so |
3148 | that find_inferior stops looking. */ | |
3149 | current_inferior = saved_inferior; | |
3150 | ||
3151 | /* If the step over is cancelled, this is set again. */ | |
3152 | lwp->need_step_over = 0; | |
3153 | return 1; | |
3154 | } | |
d50171e4 PA |
3155 | } |
3156 | ||
3157 | current_inferior = saved_inferior; | |
3158 | ||
3159 | if (debug_threads) | |
3160 | fprintf (stderr, | |
3161 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3162 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3163 | |
bd99dc85 | 3164 | return 0; |
5544ad89 DJ |
3165 | } |
3166 | ||
d50171e4 PA |
3167 | /* Start a step-over operation on LWP. When LWP stopped at a |
3168 | breakpoint, to make progress, we need to remove the breakpoint out | |
3169 | of the way. If we let other threads run while we do that, they may | |
3170 | pass by the breakpoint location and miss hitting it. To avoid | |
3171 | that, a step-over momentarily stops all threads while LWP is | |
3172 | single-stepped while the breakpoint is temporarily uninserted from | |
3173 | the inferior. When the single-step finishes, we reinsert the | |
3174 | breakpoint, and let all threads that are supposed to be running, | |
3175 | run again. | |
3176 | ||
3177 | On targets that don't support hardware single-step, we don't | |
3178 | currently support full software single-stepping. Instead, we only | |
3179 | support stepping over the thread event breakpoint, by asking the | |
3180 | low target where to place a reinsert breakpoint. Since this | |
3181 | routine assumes the breakpoint being stepped over is a thread event | |
3182 | breakpoint, it usually assumes the return address of the current | |
3183 | function is a good enough place to set the reinsert breakpoint. */ | |
3184 | ||
3185 | static int | |
3186 | start_step_over (struct lwp_info *lwp) | |
3187 | { | |
3188 | struct thread_info *saved_inferior; | |
3189 | CORE_ADDR pc; | |
3190 | int step; | |
3191 | ||
3192 | if (debug_threads) | |
3193 | fprintf (stderr, | |
3194 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3195 | lwpid_of (lwp)); | |
3196 | ||
7984d532 PA |
3197 | stop_all_lwps (1, lwp); |
3198 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3199 | |
3200 | if (debug_threads) | |
3201 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3202 | ||
3203 | /* Note, we should always reach here with an already adjusted PC, | |
3204 | either by GDB (if we're resuming due to GDB's request), or by our | |
3205 | caller, if we just finished handling an internal breakpoint GDB | |
3206 | shouldn't care about. */ | |
3207 | pc = get_pc (lwp); | |
3208 | ||
3209 | saved_inferior = current_inferior; | |
3210 | current_inferior = get_lwp_thread (lwp); | |
3211 | ||
3212 | lwp->bp_reinsert = pc; | |
3213 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3214 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3215 | |
3216 | if (can_hardware_single_step ()) | |
3217 | { | |
3218 | step = 1; | |
3219 | } | |
3220 | else | |
3221 | { | |
3222 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3223 | set_reinsert_breakpoint (raddr); | |
3224 | step = 0; | |
3225 | } | |
3226 | ||
3227 | current_inferior = saved_inferior; | |
3228 | ||
3229 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3230 | ||
3231 | /* Require next event from this LWP. */ | |
3232 | step_over_bkpt = lwp->head.id; | |
3233 | return 1; | |
3234 | } | |
3235 | ||
3236 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3237 | start_step_over, if still there, and delete any reinsert | |
3238 | breakpoints we've set, on non hardware single-step targets. */ | |
3239 | ||
3240 | static int | |
3241 | finish_step_over (struct lwp_info *lwp) | |
3242 | { | |
3243 | if (lwp->bp_reinsert != 0) | |
3244 | { | |
3245 | if (debug_threads) | |
3246 | fprintf (stderr, "Finished step over.\n"); | |
3247 | ||
3248 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3249 | may be no breakpoint to reinsert there by now. */ | |
3250 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3251 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3252 | |
3253 | lwp->bp_reinsert = 0; | |
3254 | ||
3255 | /* Delete any software-single-step reinsert breakpoints. No | |
3256 | longer needed. We don't have to worry about other threads | |
3257 | hitting this trap, and later not being able to explain it, | |
3258 | because we were stepping over a breakpoint, and we hold all | |
3259 | threads but LWP stopped while doing that. */ | |
3260 | if (!can_hardware_single_step ()) | |
3261 | delete_reinsert_breakpoints (); | |
3262 | ||
3263 | step_over_bkpt = null_ptid; | |
3264 | return 1; | |
3265 | } | |
3266 | else | |
3267 | return 0; | |
3268 | } | |
3269 | ||
5544ad89 DJ |
3270 | /* This function is called once per thread. We check the thread's resume |
3271 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3272 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3273 | |
bd99dc85 PA |
3274 | For threads which we aren't explicitly told otherwise, we preserve |
3275 | the stepping flag; this is used for stepping over gdbserver-placed | |
3276 | breakpoints. | |
3277 | ||
3278 | If pending_flags was set in any thread, we queue any needed | |
3279 | signals, since we won't actually resume. We already have a pending | |
3280 | event to report, so we don't need to preserve any step requests; | |
3281 | they should be re-issued if necessary. */ | |
3282 | ||
3283 | static int | |
3284 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3285 | { |
54a0b537 | 3286 | struct lwp_info *lwp; |
5544ad89 | 3287 | struct thread_info *thread; |
bd99dc85 | 3288 | int step; |
d50171e4 PA |
3289 | int leave_all_stopped = * (int *) arg; |
3290 | int leave_pending; | |
5544ad89 DJ |
3291 | |
3292 | thread = (struct thread_info *) entry; | |
54a0b537 | 3293 | lwp = get_thread_lwp (thread); |
5544ad89 | 3294 | |
2bd7c093 | 3295 | if (lwp->resume == NULL) |
bd99dc85 | 3296 | return 0; |
5544ad89 | 3297 | |
bd99dc85 | 3298 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3299 | { |
bd99dc85 | 3300 | if (debug_threads) |
d50171e4 | 3301 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3302 | |
3303 | if (!lwp->stopped) | |
3304 | { | |
3305 | if (debug_threads) | |
d50171e4 | 3306 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3307 | |
d50171e4 PA |
3308 | /* Stop the thread, and wait for the event asynchronously, |
3309 | through the event loop. */ | |
02fc4de7 | 3310 | send_sigstop (lwp); |
bd99dc85 PA |
3311 | } |
3312 | else | |
3313 | { | |
3314 | if (debug_threads) | |
d50171e4 PA |
3315 | fprintf (stderr, "already stopped LWP %ld\n", |
3316 | lwpid_of (lwp)); | |
3317 | ||
3318 | /* The LWP may have been stopped in an internal event that | |
3319 | was not meant to be notified back to GDB (e.g., gdbserver | |
3320 | breakpoint), so we should be reporting a stop event in | |
3321 | this case too. */ | |
3322 | ||
3323 | /* If the thread already has a pending SIGSTOP, this is a | |
3324 | no-op. Otherwise, something later will presumably resume | |
3325 | the thread and this will cause it to cancel any pending | |
3326 | operation, due to last_resume_kind == resume_stop. If | |
3327 | the thread already has a pending status to report, we | |
3328 | will still report it the next time we wait - see | |
3329 | status_pending_p_callback. */ | |
1a981360 PA |
3330 | |
3331 | /* If we already have a pending signal to report, then | |
3332 | there's no need to queue a SIGSTOP, as this means we're | |
3333 | midway through moving the LWP out of the jumppad, and we | |
3334 | will report the pending signal as soon as that is | |
3335 | finished. */ | |
3336 | if (lwp->pending_signals_to_report == NULL) | |
3337 | send_sigstop (lwp); | |
bd99dc85 | 3338 | } |
32ca6d61 | 3339 | |
bd99dc85 PA |
3340 | /* For stop requests, we're done. */ |
3341 | lwp->resume = NULL; | |
fc7238bb | 3342 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3343 | return 0; |
5544ad89 DJ |
3344 | } |
3345 | ||
bd99dc85 PA |
3346 | /* If this thread which is about to be resumed has a pending status, |
3347 | then don't resume any threads - we can just report the pending | |
3348 | status. Make sure to queue any signals that would otherwise be | |
3349 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3350 | thread has a pending status. If there's a thread that needs the |
3351 | step-over-breakpoint dance, then don't resume any other thread | |
3352 | but that particular one. */ | |
3353 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3354 | |
d50171e4 | 3355 | if (!leave_pending) |
bd99dc85 PA |
3356 | { |
3357 | if (debug_threads) | |
3358 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3359 | |
d50171e4 | 3360 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3361 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3362 | } |
3363 | else | |
3364 | { | |
3365 | if (debug_threads) | |
3366 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3367 | |
bd99dc85 PA |
3368 | /* If we have a new signal, enqueue the signal. */ |
3369 | if (lwp->resume->sig != 0) | |
3370 | { | |
3371 | struct pending_signals *p_sig; | |
3372 | p_sig = xmalloc (sizeof (*p_sig)); | |
3373 | p_sig->prev = lwp->pending_signals; | |
3374 | p_sig->signal = lwp->resume->sig; | |
3375 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3376 | ||
3377 | /* If this is the same signal we were previously stopped by, | |
3378 | make sure to queue its siginfo. We can ignore the return | |
3379 | value of ptrace; if it fails, we'll skip | |
3380 | PTRACE_SETSIGINFO. */ | |
3381 | if (WIFSTOPPED (lwp->last_status) | |
3382 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
3383 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
3384 | ||
3385 | lwp->pending_signals = p_sig; | |
3386 | } | |
3387 | } | |
5544ad89 | 3388 | |
fc7238bb | 3389 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3390 | lwp->resume = NULL; |
5544ad89 | 3391 | return 0; |
0d62e5e8 DJ |
3392 | } |
3393 | ||
3394 | static void | |
2bd7c093 | 3395 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3396 | { |
2bd7c093 | 3397 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3398 | struct lwp_info *need_step_over = NULL; |
3399 | int any_pending; | |
3400 | int leave_all_stopped; | |
c6ecbae5 | 3401 | |
2bd7c093 | 3402 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3403 | |
d50171e4 PA |
3404 | /* If there is a thread which would otherwise be resumed, which has |
3405 | a pending status, then don't resume any threads - we can just | |
3406 | report the pending status. Make sure to queue any signals that | |
3407 | would otherwise be sent. In non-stop mode, we'll apply this | |
3408 | logic to each thread individually. We consume all pending events | |
3409 | before considering to start a step-over (in all-stop). */ | |
3410 | any_pending = 0; | |
bd99dc85 | 3411 | if (!non_stop) |
d50171e4 PA |
3412 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3413 | ||
3414 | /* If there is a thread which would otherwise be resumed, which is | |
3415 | stopped at a breakpoint that needs stepping over, then don't | |
3416 | resume any threads - have it step over the breakpoint with all | |
3417 | other threads stopped, then resume all threads again. Make sure | |
3418 | to queue any signals that would otherwise be delivered or | |
3419 | queued. */ | |
3420 | if (!any_pending && supports_breakpoints ()) | |
3421 | need_step_over | |
3422 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3423 | need_step_over_p, NULL); | |
3424 | ||
3425 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3426 | ||
3427 | if (debug_threads) | |
3428 | { | |
3429 | if (need_step_over != NULL) | |
3430 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3431 | else if (any_pending) | |
3432 | fprintf (stderr, | |
3433 | "Not resuming, all-stop and found " | |
3434 | "an LWP with pending status\n"); | |
3435 | else | |
3436 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3437 | } | |
3438 | ||
3439 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3440 | otherwise deliver. */ | |
3441 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3442 | ||
3443 | if (need_step_over) | |
3444 | start_step_over (need_step_over); | |
3445 | } | |
3446 | ||
3447 | /* This function is called once per thread. We check the thread's | |
3448 | last resume request, which will tell us whether to resume, step, or | |
3449 | leave the thread stopped. Any signal the client requested to be | |
3450 | delivered has already been enqueued at this point. | |
3451 | ||
3452 | If any thread that GDB wants running is stopped at an internal | |
3453 | breakpoint that needs stepping over, we start a step-over operation | |
3454 | on that particular thread, and leave all others stopped. */ | |
3455 | ||
7984d532 PA |
3456 | static int |
3457 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3458 | { |
7984d532 | 3459 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3460 | struct thread_info *thread; |
d50171e4 PA |
3461 | int step; |
3462 | ||
7984d532 PA |
3463 | if (lwp == except) |
3464 | return 0; | |
d50171e4 PA |
3465 | |
3466 | if (debug_threads) | |
3467 | fprintf (stderr, | |
3468 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3469 | ||
3470 | if (!lwp->stopped) | |
3471 | { | |
3472 | if (debug_threads) | |
3473 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3474 | return 0; |
d50171e4 PA |
3475 | } |
3476 | ||
8336d594 PA |
3477 | thread = get_lwp_thread (lwp); |
3478 | ||
02fc4de7 PA |
3479 | if (thread->last_resume_kind == resume_stop |
3480 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3481 | { |
3482 | if (debug_threads) | |
02fc4de7 PA |
3483 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3484 | lwpid_of (lwp)); | |
7984d532 | 3485 | return 0; |
d50171e4 PA |
3486 | } |
3487 | ||
3488 | if (lwp->status_pending_p) | |
3489 | { | |
3490 | if (debug_threads) | |
3491 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3492 | lwpid_of (lwp)); | |
7984d532 | 3493 | return 0; |
d50171e4 PA |
3494 | } |
3495 | ||
7984d532 PA |
3496 | gdb_assert (lwp->suspended >= 0); |
3497 | ||
d50171e4 PA |
3498 | if (lwp->suspended) |
3499 | { | |
3500 | if (debug_threads) | |
3501 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3502 | return 0; |
d50171e4 PA |
3503 | } |
3504 | ||
1a981360 PA |
3505 | if (thread->last_resume_kind == resume_stop |
3506 | && lwp->pending_signals_to_report == NULL | |
3507 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3508 | { |
3509 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3510 | last_status.kind check above would catch it, and we wouldn't | |
3511 | reach here. This LWP may have been momentarily paused by a | |
3512 | stop_all_lwps call while handling for example, another LWP's | |
3513 | step-over. In that case, the pending expected SIGSTOP signal | |
3514 | that was queued at vCont;t handling time will have already | |
3515 | been consumed by wait_for_sigstop, and so we need to requeue | |
3516 | another one here. Note that if the LWP already has a SIGSTOP | |
3517 | pending, this is a no-op. */ | |
3518 | ||
3519 | if (debug_threads) | |
3520 | fprintf (stderr, | |
3521 | "Client wants LWP %ld to stop. " | |
3522 | "Making sure it has a SIGSTOP pending\n", | |
3523 | lwpid_of (lwp)); | |
3524 | ||
3525 | send_sigstop (lwp); | |
3526 | } | |
3527 | ||
8336d594 | 3528 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3529 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3530 | return 0; |
3531 | } | |
3532 | ||
3533 | static int | |
3534 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3535 | { | |
3536 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3537 | ||
3538 | if (lwp == except) | |
3539 | return 0; | |
3540 | ||
3541 | lwp->suspended--; | |
3542 | gdb_assert (lwp->suspended >= 0); | |
3543 | ||
3544 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3545 | } |
3546 | ||
3547 | /* When we finish a step-over, set threads running again. If there's | |
3548 | another thread that may need a step-over, now's the time to start | |
3549 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3550 | ||
3551 | static void | |
3552 | proceed_all_lwps (void) | |
3553 | { | |
3554 | struct lwp_info *need_step_over; | |
3555 | ||
3556 | /* If there is a thread which would otherwise be resumed, which is | |
3557 | stopped at a breakpoint that needs stepping over, then don't | |
3558 | resume any threads - have it step over the breakpoint with all | |
3559 | other threads stopped, then resume all threads again. */ | |
3560 | ||
3561 | if (supports_breakpoints ()) | |
3562 | { | |
3563 | need_step_over | |
3564 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3565 | need_step_over_p, NULL); | |
3566 | ||
3567 | if (need_step_over != NULL) | |
3568 | { | |
3569 | if (debug_threads) | |
3570 | fprintf (stderr, "proceed_all_lwps: found " | |
3571 | "thread %ld needing a step-over\n", | |
3572 | lwpid_of (need_step_over)); | |
3573 | ||
3574 | start_step_over (need_step_over); | |
3575 | return; | |
3576 | } | |
3577 | } | |
5544ad89 | 3578 | |
d50171e4 PA |
3579 | if (debug_threads) |
3580 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3581 | ||
7984d532 | 3582 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3583 | } |
3584 | ||
3585 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3586 | pending statuses, are set to run again, except for EXCEPT, if not | |
3587 | NULL. This undoes a stop_all_lwps call. */ | |
3588 | ||
3589 | static void | |
7984d532 | 3590 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3591 | { |
5544ad89 DJ |
3592 | if (debug_threads) |
3593 | { | |
d50171e4 PA |
3594 | if (except) |
3595 | fprintf (stderr, | |
3596 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3597 | else |
d50171e4 PA |
3598 | fprintf (stderr, |
3599 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3600 | } |
3601 | ||
7984d532 PA |
3602 | if (unsuspend) |
3603 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3604 | else | |
3605 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3606 | } |
3607 | ||
3608 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
3609 | |
3610 | int | |
0a30fbc4 | 3611 | register_addr (int regnum) |
da6d8c04 DJ |
3612 | { |
3613 | int addr; | |
3614 | ||
2ec06d2e | 3615 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
3616 | error ("Invalid register number %d.", regnum); |
3617 | ||
2ec06d2e | 3618 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
3619 | |
3620 | return addr; | |
3621 | } | |
3622 | ||
58caa3dc | 3623 | /* Fetch one register. */ |
da6d8c04 | 3624 | static void |
442ea881 | 3625 | fetch_register (struct regcache *regcache, int regno) |
da6d8c04 DJ |
3626 | { |
3627 | CORE_ADDR regaddr; | |
48d93c75 | 3628 | int i, size; |
0d62e5e8 | 3629 | char *buf; |
95954743 | 3630 | int pid; |
da6d8c04 | 3631 | |
2ec06d2e | 3632 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 3633 | return; |
2ec06d2e | 3634 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 3635 | return; |
da6d8c04 | 3636 | |
0a30fbc4 DJ |
3637 | regaddr = register_addr (regno); |
3638 | if (regaddr == -1) | |
3639 | return; | |
95954743 PA |
3640 | |
3641 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
3642 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
3643 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
3644 | buf = alloca (size); |
3645 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
3646 | { |
3647 | errno = 0; | |
0d62e5e8 | 3648 | *(PTRACE_XFER_TYPE *) (buf + i) = |
14ce3065 DE |
3649 | ptrace (PTRACE_PEEKUSER, pid, |
3650 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3651 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3652 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
da6d8c04 DJ |
3653 | regaddr += sizeof (PTRACE_XFER_TYPE); |
3654 | if (errno != 0) | |
f52cd8cd | 3655 | error ("reading register %d: %s", regno, strerror (errno)); |
da6d8c04 | 3656 | } |
ee1a7ae4 UW |
3657 | |
3658 | if (the_low_target.supply_ptrace_register) | |
442ea881 | 3659 | the_low_target.supply_ptrace_register (regcache, regno, buf); |
5a1f5858 | 3660 | else |
442ea881 | 3661 | supply_register (regcache, regno, buf); |
da6d8c04 DJ |
3662 | } |
3663 | ||
3664 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc | 3665 | static void |
442ea881 | 3666 | usr_fetch_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 3667 | { |
4463ce24 | 3668 | if (regno == -1) |
2ec06d2e | 3669 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 3670 | fetch_register (regcache, regno); |
da6d8c04 | 3671 | else |
442ea881 | 3672 | fetch_register (regcache, regno); |
da6d8c04 DJ |
3673 | } |
3674 | ||
3675 | /* Store our register values back into the inferior. | |
3676 | If REGNO is -1, do this for all registers. | |
3677 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc | 3678 | static void |
442ea881 | 3679 | usr_store_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 DJ |
3680 | { |
3681 | CORE_ADDR regaddr; | |
48d93c75 | 3682 | int i, size; |
0d62e5e8 | 3683 | char *buf; |
55ac2b99 | 3684 | int pid; |
da6d8c04 DJ |
3685 | |
3686 | if (regno >= 0) | |
3687 | { | |
2ec06d2e | 3688 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
3689 | return; |
3690 | ||
bc1e36ca | 3691 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
3692 | return; |
3693 | ||
3694 | regaddr = register_addr (regno); | |
3695 | if (regaddr == -1) | |
da6d8c04 | 3696 | return; |
da6d8c04 | 3697 | errno = 0; |
48d93c75 UW |
3698 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
3699 | & - sizeof (PTRACE_XFER_TYPE); | |
3700 | buf = alloca (size); | |
3701 | memset (buf, 0, size); | |
ee1a7ae4 UW |
3702 | |
3703 | if (the_low_target.collect_ptrace_register) | |
442ea881 | 3704 | the_low_target.collect_ptrace_register (regcache, regno, buf); |
5a1f5858 | 3705 | else |
442ea881 | 3706 | collect_register (regcache, regno, buf); |
ee1a7ae4 | 3707 | |
95954743 | 3708 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 3709 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 3710 | { |
0a30fbc4 | 3711 | errno = 0; |
14ce3065 DE |
3712 | ptrace (PTRACE_POKEUSER, pid, |
3713 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3714 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3715 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
3716 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
da6d8c04 DJ |
3717 | if (errno != 0) |
3718 | { | |
1b3f6016 PA |
3719 | /* At this point, ESRCH should mean the process is |
3720 | already gone, in which case we simply ignore attempts | |
3721 | to change its registers. See also the related | |
3722 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
3723 | if (errno == ESRCH) |
3724 | return; | |
3725 | ||
bc1e36ca | 3726 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
f52cd8cd | 3727 | error ("writing register %d: %s", regno, strerror (errno)); |
da6d8c04 | 3728 | } |
2ff29de4 | 3729 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 3730 | } |
da6d8c04 DJ |
3731 | } |
3732 | else | |
2ec06d2e | 3733 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 3734 | usr_store_inferior_registers (regcache, regno); |
da6d8c04 | 3735 | } |
58caa3dc DJ |
3736 | #endif /* HAVE_LINUX_USRREGS */ |
3737 | ||
3738 | ||
3739 | ||
3740 | #ifdef HAVE_LINUX_REGSETS | |
3741 | ||
3742 | static int | |
442ea881 | 3743 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3744 | { |
3745 | struct regset_info *regset; | |
e9d25b98 | 3746 | int saw_general_regs = 0; |
95954743 | 3747 | int pid; |
1570b33e | 3748 | struct iovec iov; |
58caa3dc DJ |
3749 | |
3750 | regset = target_regsets; | |
3751 | ||
95954743 | 3752 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3753 | while (regset->size >= 0) |
3754 | { | |
1570b33e L |
3755 | void *buf, *data; |
3756 | int nt_type, res; | |
58caa3dc | 3757 | |
52fa2412 | 3758 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3759 | { |
3760 | regset ++; | |
3761 | continue; | |
3762 | } | |
3763 | ||
bca929d3 | 3764 | buf = xmalloc (regset->size); |
1570b33e L |
3765 | |
3766 | nt_type = regset->nt_type; | |
3767 | if (nt_type) | |
3768 | { | |
3769 | iov.iov_base = buf; | |
3770 | iov.iov_len = regset->size; | |
3771 | data = (void *) &iov; | |
3772 | } | |
3773 | else | |
3774 | data = buf; | |
3775 | ||
dfb64f85 | 3776 | #ifndef __sparc__ |
1570b33e | 3777 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3778 | #else |
1570b33e | 3779 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 3780 | #endif |
58caa3dc DJ |
3781 | if (res < 0) |
3782 | { | |
3783 | if (errno == EIO) | |
3784 | { | |
52fa2412 UW |
3785 | /* If we get EIO on a regset, do not try it again for |
3786 | this process. */ | |
3787 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3788 | free (buf); |
52fa2412 | 3789 | continue; |
58caa3dc DJ |
3790 | } |
3791 | else | |
3792 | { | |
0d62e5e8 | 3793 | char s[256]; |
95954743 PA |
3794 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
3795 | pid); | |
0d62e5e8 | 3796 | perror (s); |
58caa3dc DJ |
3797 | } |
3798 | } | |
e9d25b98 DJ |
3799 | else if (regset->type == GENERAL_REGS) |
3800 | saw_general_regs = 1; | |
442ea881 | 3801 | regset->store_function (regcache, buf); |
58caa3dc | 3802 | regset ++; |
fdeb2a12 | 3803 | free (buf); |
58caa3dc | 3804 | } |
e9d25b98 DJ |
3805 | if (saw_general_regs) |
3806 | return 0; | |
3807 | else | |
3808 | return 1; | |
58caa3dc DJ |
3809 | } |
3810 | ||
3811 | static int | |
442ea881 | 3812 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3813 | { |
3814 | struct regset_info *regset; | |
e9d25b98 | 3815 | int saw_general_regs = 0; |
95954743 | 3816 | int pid; |
1570b33e | 3817 | struct iovec iov; |
58caa3dc DJ |
3818 | |
3819 | regset = target_regsets; | |
3820 | ||
95954743 | 3821 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3822 | while (regset->size >= 0) |
3823 | { | |
1570b33e L |
3824 | void *buf, *data; |
3825 | int nt_type, res; | |
58caa3dc | 3826 | |
52fa2412 | 3827 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3828 | { |
3829 | regset ++; | |
3830 | continue; | |
3831 | } | |
3832 | ||
bca929d3 | 3833 | buf = xmalloc (regset->size); |
545587ee DJ |
3834 | |
3835 | /* First fill the buffer with the current register set contents, | |
3836 | in case there are any items in the kernel's regset that are | |
3837 | not in gdbserver's regcache. */ | |
1570b33e L |
3838 | |
3839 | nt_type = regset->nt_type; | |
3840 | if (nt_type) | |
3841 | { | |
3842 | iov.iov_base = buf; | |
3843 | iov.iov_len = regset->size; | |
3844 | data = (void *) &iov; | |
3845 | } | |
3846 | else | |
3847 | data = buf; | |
3848 | ||
dfb64f85 | 3849 | #ifndef __sparc__ |
1570b33e | 3850 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3851 | #else |
1570b33e | 3852 | res = ptrace (regset->get_request, pid, &iov, data); |
dfb64f85 | 3853 | #endif |
545587ee DJ |
3854 | |
3855 | if (res == 0) | |
3856 | { | |
3857 | /* Then overlay our cached registers on that. */ | |
442ea881 | 3858 | regset->fill_function (regcache, buf); |
545587ee DJ |
3859 | |
3860 | /* Only now do we write the register set. */ | |
dfb64f85 | 3861 | #ifndef __sparc__ |
1570b33e | 3862 | res = ptrace (regset->set_request, pid, nt_type, data); |
dfb64f85 | 3863 | #else |
1570b33e | 3864 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 3865 | #endif |
545587ee DJ |
3866 | } |
3867 | ||
58caa3dc DJ |
3868 | if (res < 0) |
3869 | { | |
3870 | if (errno == EIO) | |
3871 | { | |
52fa2412 UW |
3872 | /* If we get EIO on a regset, do not try it again for |
3873 | this process. */ | |
3874 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3875 | free (buf); |
52fa2412 | 3876 | continue; |
58caa3dc | 3877 | } |
3221518c UW |
3878 | else if (errno == ESRCH) |
3879 | { | |
1b3f6016 PA |
3880 | /* At this point, ESRCH should mean the process is |
3881 | already gone, in which case we simply ignore attempts | |
3882 | to change its registers. See also the related | |
3883 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 3884 | free (buf); |
3221518c UW |
3885 | return 0; |
3886 | } | |
58caa3dc DJ |
3887 | else |
3888 | { | |
ce3a066d | 3889 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
3890 | } |
3891 | } | |
e9d25b98 DJ |
3892 | else if (regset->type == GENERAL_REGS) |
3893 | saw_general_regs = 1; | |
58caa3dc | 3894 | regset ++; |
09ec9b38 | 3895 | free (buf); |
58caa3dc | 3896 | } |
e9d25b98 DJ |
3897 | if (saw_general_regs) |
3898 | return 0; | |
3899 | else | |
3900 | return 1; | |
ce3a066d | 3901 | return 0; |
58caa3dc DJ |
3902 | } |
3903 | ||
3904 | #endif /* HAVE_LINUX_REGSETS */ | |
3905 | ||
3906 | ||
3907 | void | |
442ea881 | 3908 | linux_fetch_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3909 | { |
3910 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3911 | if (regsets_fetch_inferior_registers (regcache) == 0) |
52fa2412 | 3912 | return; |
58caa3dc DJ |
3913 | #endif |
3914 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3915 | usr_fetch_inferior_registers (regcache, regno); |
58caa3dc DJ |
3916 | #endif |
3917 | } | |
3918 | ||
3919 | void | |
442ea881 | 3920 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3921 | { |
3922 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3923 | if (regsets_store_inferior_registers (regcache) == 0) |
52fa2412 | 3924 | return; |
58caa3dc DJ |
3925 | #endif |
3926 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3927 | usr_store_inferior_registers (regcache, regno); |
58caa3dc DJ |
3928 | #endif |
3929 | } | |
3930 | ||
da6d8c04 | 3931 | |
da6d8c04 DJ |
3932 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
3933 | to debugger memory starting at MYADDR. */ | |
3934 | ||
c3e735a6 | 3935 | static int |
f450004a | 3936 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
3937 | { |
3938 | register int i; | |
3939 | /* Round starting address down to longword boundary. */ | |
3940 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
3941 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
3942 | register int count |
3943 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
3944 | / sizeof (PTRACE_XFER_TYPE); |
3945 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 3946 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 3947 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
3948 | int fd; |
3949 | char filename[64]; | |
95954743 | 3950 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
3951 | |
3952 | /* Try using /proc. Don't bother for one word. */ | |
3953 | if (len >= 3 * sizeof (long)) | |
3954 | { | |
3955 | /* We could keep this file open and cache it - possibly one per | |
3956 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 3957 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
3958 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
3959 | if (fd == -1) | |
3960 | goto no_proc; | |
3961 | ||
3962 | /* If pread64 is available, use it. It's faster if the kernel | |
3963 | supports it (only one syscall), and it's 64-bit safe even on | |
3964 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
3965 | application). */ | |
3966 | #ifdef HAVE_PREAD64 | |
3967 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
3968 | #else | |
1de1badb | 3969 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
3970 | #endif |
3971 | { | |
3972 | close (fd); | |
3973 | goto no_proc; | |
3974 | } | |
3975 | ||
3976 | close (fd); | |
3977 | return 0; | |
3978 | } | |
da6d8c04 | 3979 | |
fd462a61 | 3980 | no_proc: |
da6d8c04 DJ |
3981 | /* Read all the longwords */ |
3982 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
3983 | { | |
c3e735a6 | 3984 | errno = 0; |
14ce3065 DE |
3985 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
3986 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3987 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
3988 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
3989 | if (errno) |
3990 | return errno; | |
da6d8c04 DJ |
3991 | } |
3992 | ||
3993 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
3994 | memcpy (myaddr, |
3995 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
3996 | len); | |
c3e735a6 DJ |
3997 | |
3998 | return 0; | |
da6d8c04 DJ |
3999 | } |
4000 | ||
93ae6fdc PA |
4001 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4002 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
4003 | returns the value of errno. */ |
4004 | ||
ce3a066d | 4005 | static int |
f450004a | 4006 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4007 | { |
4008 | register int i; | |
4009 | /* Round starting address down to longword boundary. */ | |
4010 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4011 | /* Round ending address up; get number of longwords that makes. */ | |
4012 | register int count | |
493e2a69 MS |
4013 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4014 | / sizeof (PTRACE_XFER_TYPE); | |
4015 | ||
da6d8c04 | 4016 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4017 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4018 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4019 | ||
95954743 | 4020 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4021 | |
0d62e5e8 DJ |
4022 | if (debug_threads) |
4023 | { | |
58d6951d DJ |
4024 | /* Dump up to four bytes. */ |
4025 | unsigned int val = * (unsigned int *) myaddr; | |
4026 | if (len == 1) | |
4027 | val = val & 0xff; | |
4028 | else if (len == 2) | |
4029 | val = val & 0xffff; | |
4030 | else if (len == 3) | |
4031 | val = val & 0xffffff; | |
4032 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4033 | val, (long)memaddr); | |
0d62e5e8 DJ |
4034 | } |
4035 | ||
da6d8c04 DJ |
4036 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4037 | ||
93ae6fdc | 4038 | errno = 0; |
14ce3065 DE |
4039 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4040 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4041 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
4042 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
4043 | if (errno) |
4044 | return errno; | |
da6d8c04 DJ |
4045 | |
4046 | if (count > 1) | |
4047 | { | |
93ae6fdc | 4048 | errno = 0; |
da6d8c04 | 4049 | buffer[count - 1] |
95954743 | 4050 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4051 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4052 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4053 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4054 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 4055 | 0); |
93ae6fdc PA |
4056 | if (errno) |
4057 | return errno; | |
da6d8c04 DJ |
4058 | } |
4059 | ||
93ae6fdc | 4060 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4061 | |
493e2a69 MS |
4062 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4063 | myaddr, len); | |
da6d8c04 DJ |
4064 | |
4065 | /* Write the entire buffer. */ | |
4066 | ||
4067 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4068 | { | |
4069 | errno = 0; | |
14ce3065 DE |
4070 | ptrace (PTRACE_POKETEXT, pid, |
4071 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4072 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4073 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4074 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4075 | if (errno) |
4076 | return errno; | |
4077 | } | |
4078 | ||
4079 | return 0; | |
4080 | } | |
2f2893d9 | 4081 | |
6076632b | 4082 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4083 | static int linux_supports_tracefork_flag; |
4084 | ||
1e7fc18c PA |
4085 | static void |
4086 | linux_enable_event_reporting (int pid) | |
4087 | { | |
4088 | if (!linux_supports_tracefork_flag) | |
4089 | return; | |
4090 | ||
4091 | ptrace (PTRACE_SETOPTIONS, pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
4092 | } | |
4093 | ||
51c2684e | 4094 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4095 | |
51c2684e DJ |
4096 | static int |
4097 | linux_tracefork_grandchild (void *arg) | |
4098 | { | |
4099 | _exit (0); | |
4100 | } | |
4101 | ||
7407e2de AS |
4102 | #define STACK_SIZE 4096 |
4103 | ||
51c2684e DJ |
4104 | static int |
4105 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
4106 | { |
4107 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
4108 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
4109 | |
4110 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4111 | ||
4112 | if (fork () == 0) | |
4113 | linux_tracefork_grandchild (NULL); | |
4114 | ||
4115 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4116 | ||
7407e2de AS |
4117 | #ifdef __ia64__ |
4118 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4119 | CLONE_VM | SIGCHLD, NULL); | |
4120 | #else | |
a1f2ce7d | 4121 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4122 | CLONE_VM | SIGCHLD, NULL); |
4123 | #endif | |
e4b7f41c JK |
4124 | |
4125 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4126 | ||
24a09b5f DJ |
4127 | _exit (0); |
4128 | } | |
4129 | ||
24a09b5f DJ |
4130 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4131 | sure that we can enable the option, and that it had the desired | |
4132 | effect. */ | |
4133 | ||
4134 | static void | |
4135 | linux_test_for_tracefork (void) | |
4136 | { | |
4137 | int child_pid, ret, status; | |
4138 | long second_pid; | |
e4b7f41c | 4139 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4140 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4141 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4142 | |
4143 | linux_supports_tracefork_flag = 0; | |
4144 | ||
e4b7f41c JK |
4145 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4146 | ||
4147 | child_pid = fork (); | |
4148 | if (child_pid == 0) | |
4149 | linux_tracefork_child (NULL); | |
4150 | ||
4151 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4152 | ||
51c2684e | 4153 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4154 | #ifdef __ia64__ |
4155 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4156 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4157 | #else /* !__ia64__ */ |
7407e2de AS |
4158 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4159 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4160 | #endif /* !__ia64__ */ |
4161 | ||
4162 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4163 | ||
24a09b5f | 4164 | if (child_pid == -1) |
51c2684e | 4165 | perror_with_name ("clone"); |
24a09b5f DJ |
4166 | |
4167 | ret = my_waitpid (child_pid, &status, 0); | |
4168 | if (ret == -1) | |
4169 | perror_with_name ("waitpid"); | |
4170 | else if (ret != child_pid) | |
4171 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4172 | if (! WIFSTOPPED (status)) | |
4173 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4174 | ||
14ce3065 DE |
4175 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
4176 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
4177 | if (ret != 0) |
4178 | { | |
4179 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4180 | if (ret != 0) | |
4181 | { | |
4182 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4183 | return; | |
4184 | } | |
4185 | ||
4186 | ret = my_waitpid (child_pid, &status, 0); | |
4187 | if (ret != child_pid) | |
4188 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4189 | else if (!WIFSIGNALED (status)) | |
4190 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4191 | "killed child", status); | |
4192 | ||
4193 | return; | |
4194 | } | |
4195 | ||
4196 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
4197 | if (ret != 0) | |
4198 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4199 | ||
4200 | ret = my_waitpid (child_pid, &status, 0); | |
4201 | ||
4202 | if (ret == child_pid && WIFSTOPPED (status) | |
4203 | && status >> 16 == PTRACE_EVENT_FORK) | |
4204 | { | |
4205 | second_pid = 0; | |
4206 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
4207 | if (ret == 0 && second_pid != 0) | |
4208 | { | |
4209 | int second_status; | |
4210 | ||
4211 | linux_supports_tracefork_flag = 1; | |
4212 | my_waitpid (second_pid, &second_status, 0); | |
4213 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
4214 | if (ret != 0) | |
4215 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4216 | my_waitpid (second_pid, &status, 0); | |
4217 | } | |
4218 | } | |
4219 | else | |
4220 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4221 | "(%d, status 0x%x)", ret, status); | |
4222 | ||
4223 | do | |
4224 | { | |
4225 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4226 | if (ret != 0) | |
4227 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4228 | my_waitpid (child_pid, &status, 0); | |
4229 | } | |
4230 | while (WIFSTOPPED (status)); | |
51c2684e | 4231 | |
e4b7f41c | 4232 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4233 | free (stack); |
e4b7f41c | 4234 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4235 | } |
4236 | ||
4237 | ||
2f2893d9 DJ |
4238 | static void |
4239 | linux_look_up_symbols (void) | |
4240 | { | |
0d62e5e8 | 4241 | #ifdef USE_THREAD_DB |
95954743 PA |
4242 | struct process_info *proc = current_process (); |
4243 | ||
cdbfd419 | 4244 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4245 | return; |
4246 | ||
6076632b DE |
4247 | /* If the kernel supports tracing forks then it also supports tracing |
4248 | clones, and then we don't need to use the magic thread event breakpoint | |
4249 | to learn about threads. */ | |
cdbfd419 | 4250 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4251 | #endif |
4252 | } | |
4253 | ||
e5379b03 | 4254 | static void |
ef57601b | 4255 | linux_request_interrupt (void) |
e5379b03 | 4256 | { |
a1928bad | 4257 | extern unsigned long signal_pid; |
e5379b03 | 4258 | |
95954743 PA |
4259 | if (!ptid_equal (cont_thread, null_ptid) |
4260 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4261 | { |
54a0b537 | 4262 | struct lwp_info *lwp; |
bd99dc85 | 4263 | int lwpid; |
e5379b03 | 4264 | |
54a0b537 | 4265 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4266 | lwpid = lwpid_of (lwp); |
4267 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4268 | } |
4269 | else | |
ef57601b | 4270 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4271 | } |
4272 | ||
aa691b87 RM |
4273 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4274 | to debugger memory starting at MYADDR. */ | |
4275 | ||
4276 | static int | |
f450004a | 4277 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4278 | { |
4279 | char filename[PATH_MAX]; | |
4280 | int fd, n; | |
95954743 | 4281 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4282 | |
6cebaf6e | 4283 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4284 | |
4285 | fd = open (filename, O_RDONLY); | |
4286 | if (fd < 0) | |
4287 | return -1; | |
4288 | ||
4289 | if (offset != (CORE_ADDR) 0 | |
4290 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4291 | n = -1; | |
4292 | else | |
4293 | n = read (fd, myaddr, len); | |
4294 | ||
4295 | close (fd); | |
4296 | ||
4297 | return n; | |
4298 | } | |
4299 | ||
d993e290 PA |
4300 | /* These breakpoint and watchpoint related wrapper functions simply |
4301 | pass on the function call if the target has registered a | |
4302 | corresponding function. */ | |
e013ee27 OF |
4303 | |
4304 | static int | |
d993e290 | 4305 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4306 | { |
d993e290 PA |
4307 | if (the_low_target.insert_point != NULL) |
4308 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4309 | else |
4310 | /* Unsupported (see target.h). */ | |
4311 | return 1; | |
4312 | } | |
4313 | ||
4314 | static int | |
d993e290 | 4315 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4316 | { |
d993e290 PA |
4317 | if (the_low_target.remove_point != NULL) |
4318 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4319 | else |
4320 | /* Unsupported (see target.h). */ | |
4321 | return 1; | |
4322 | } | |
4323 | ||
4324 | static int | |
4325 | linux_stopped_by_watchpoint (void) | |
4326 | { | |
c3adc08c PA |
4327 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4328 | ||
4329 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4330 | } |
4331 | ||
4332 | static CORE_ADDR | |
4333 | linux_stopped_data_address (void) | |
4334 | { | |
c3adc08c PA |
4335 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4336 | ||
4337 | return lwp->stopped_data_address; | |
e013ee27 OF |
4338 | } |
4339 | ||
42c81e2a | 4340 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
4341 | #if defined(__mcoldfire__) |
4342 | /* These should really be defined in the kernel's ptrace.h header. */ | |
4343 | #define PT_TEXT_ADDR 49*4 | |
4344 | #define PT_DATA_ADDR 50*4 | |
4345 | #define PT_TEXT_END_ADDR 51*4 | |
eb826dc6 MF |
4346 | #elif defined(BFIN) |
4347 | #define PT_TEXT_ADDR 220 | |
4348 | #define PT_TEXT_END_ADDR 224 | |
4349 | #define PT_DATA_ADDR 228 | |
52fb6437 NS |
4350 | #endif |
4351 | ||
4352 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4353 | to tell gdb about. */ | |
4354 | ||
4355 | static int | |
4356 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4357 | { | |
4358 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
4359 | unsigned long text, text_end, data; | |
bd99dc85 | 4360 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4361 | |
4362 | errno = 0; | |
4363 | ||
4364 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
4365 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
4366 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
4367 | ||
4368 | if (errno == 0) | |
4369 | { | |
4370 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4371 | used by gdb) are relative to the beginning of the program, |
4372 | with the data segment immediately following the text segment. | |
4373 | However, the actual runtime layout in memory may put the data | |
4374 | somewhere else, so when we send gdb a data base-address, we | |
4375 | use the real data base address and subtract the compile-time | |
4376 | data base-address from it (which is just the length of the | |
4377 | text segment). BSS immediately follows data in both | |
4378 | cases. */ | |
52fb6437 NS |
4379 | *text_p = text; |
4380 | *data_p = data - (text_end - text); | |
1b3f6016 | 4381 | |
52fb6437 NS |
4382 | return 1; |
4383 | } | |
4384 | #endif | |
4385 | return 0; | |
4386 | } | |
4387 | #endif | |
4388 | ||
07e059b5 VP |
4389 | static int |
4390 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4391 | unsigned char *readbuf, unsigned const char *writebuf, |
4392 | CORE_ADDR offset, int len) | |
07e059b5 | 4393 | { |
d26e3629 | 4394 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4395 | } |
4396 | ||
d0722149 DE |
4397 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4398 | layout of the inferiors' architecture. */ | |
4399 | ||
4400 | static void | |
4401 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
4402 | { | |
4403 | int done = 0; | |
4404 | ||
4405 | if (the_low_target.siginfo_fixup != NULL) | |
4406 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4407 | ||
4408 | /* If there was no callback, or the callback didn't do anything, | |
4409 | then just do a straight memcpy. */ | |
4410 | if (!done) | |
4411 | { | |
4412 | if (direction == 1) | |
4413 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4414 | else | |
4415 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4416 | } | |
4417 | } | |
4418 | ||
4aa995e1 PA |
4419 | static int |
4420 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4421 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4422 | { | |
d0722149 | 4423 | int pid; |
4aa995e1 | 4424 | struct siginfo siginfo; |
d0722149 | 4425 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4426 | |
4427 | if (current_inferior == NULL) | |
4428 | return -1; | |
4429 | ||
bd99dc85 | 4430 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4431 | |
4432 | if (debug_threads) | |
d0722149 | 4433 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4434 | readbuf != NULL ? "Reading" : "Writing", |
4435 | pid); | |
4436 | ||
0adea5f7 | 4437 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4438 | return -1; |
4439 | ||
4440 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
4441 | return -1; | |
4442 | ||
d0722149 DE |
4443 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4444 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4445 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4446 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4447 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4448 | ||
4aa995e1 PA |
4449 | if (offset + len > sizeof (siginfo)) |
4450 | len = sizeof (siginfo) - offset; | |
4451 | ||
4452 | if (readbuf != NULL) | |
d0722149 | 4453 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4454 | else |
4455 | { | |
d0722149 DE |
4456 | memcpy (inf_siginfo + offset, writebuf, len); |
4457 | ||
4458 | /* Convert back to ptrace layout before flushing it out. */ | |
4459 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4460 | ||
4aa995e1 PA |
4461 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
4462 | return -1; | |
4463 | } | |
4464 | ||
4465 | return len; | |
4466 | } | |
4467 | ||
bd99dc85 PA |
4468 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4469 | so we notice when children change state; as the handler for the | |
4470 | sigsuspend in my_waitpid. */ | |
4471 | ||
4472 | static void | |
4473 | sigchld_handler (int signo) | |
4474 | { | |
4475 | int old_errno = errno; | |
4476 | ||
4477 | if (debug_threads) | |
e581f2b4 PA |
4478 | { |
4479 | do | |
4480 | { | |
4481 | /* fprintf is not async-signal-safe, so call write | |
4482 | directly. */ | |
4483 | if (write (2, "sigchld_handler\n", | |
4484 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4485 | break; /* just ignore */ | |
4486 | } while (0); | |
4487 | } | |
bd99dc85 PA |
4488 | |
4489 | if (target_is_async_p ()) | |
4490 | async_file_mark (); /* trigger a linux_wait */ | |
4491 | ||
4492 | errno = old_errno; | |
4493 | } | |
4494 | ||
4495 | static int | |
4496 | linux_supports_non_stop (void) | |
4497 | { | |
4498 | return 1; | |
4499 | } | |
4500 | ||
4501 | static int | |
4502 | linux_async (int enable) | |
4503 | { | |
4504 | int previous = (linux_event_pipe[0] != -1); | |
4505 | ||
8336d594 PA |
4506 | if (debug_threads) |
4507 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4508 | enable, previous); | |
4509 | ||
bd99dc85 PA |
4510 | if (previous != enable) |
4511 | { | |
4512 | sigset_t mask; | |
4513 | sigemptyset (&mask); | |
4514 | sigaddset (&mask, SIGCHLD); | |
4515 | ||
4516 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4517 | ||
4518 | if (enable) | |
4519 | { | |
4520 | if (pipe (linux_event_pipe) == -1) | |
4521 | fatal ("creating event pipe failed."); | |
4522 | ||
4523 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4524 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4525 | ||
4526 | /* Register the event loop handler. */ | |
4527 | add_file_handler (linux_event_pipe[0], | |
4528 | handle_target_event, NULL); | |
4529 | ||
4530 | /* Always trigger a linux_wait. */ | |
4531 | async_file_mark (); | |
4532 | } | |
4533 | else | |
4534 | { | |
4535 | delete_file_handler (linux_event_pipe[0]); | |
4536 | ||
4537 | close (linux_event_pipe[0]); | |
4538 | close (linux_event_pipe[1]); | |
4539 | linux_event_pipe[0] = -1; | |
4540 | linux_event_pipe[1] = -1; | |
4541 | } | |
4542 | ||
4543 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4544 | } | |
4545 | ||
4546 | return previous; | |
4547 | } | |
4548 | ||
4549 | static int | |
4550 | linux_start_non_stop (int nonstop) | |
4551 | { | |
4552 | /* Register or unregister from event-loop accordingly. */ | |
4553 | linux_async (nonstop); | |
4554 | return 0; | |
4555 | } | |
4556 | ||
cf8fd78b PA |
4557 | static int |
4558 | linux_supports_multi_process (void) | |
4559 | { | |
4560 | return 1; | |
4561 | } | |
4562 | ||
efcbbd14 UW |
4563 | |
4564 | /* Enumerate spufs IDs for process PID. */ | |
4565 | static int | |
4566 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
4567 | { | |
4568 | int pos = 0; | |
4569 | int written = 0; | |
4570 | char path[128]; | |
4571 | DIR *dir; | |
4572 | struct dirent *entry; | |
4573 | ||
4574 | sprintf (path, "/proc/%ld/fd", pid); | |
4575 | dir = opendir (path); | |
4576 | if (!dir) | |
4577 | return -1; | |
4578 | ||
4579 | rewinddir (dir); | |
4580 | while ((entry = readdir (dir)) != NULL) | |
4581 | { | |
4582 | struct stat st; | |
4583 | struct statfs stfs; | |
4584 | int fd; | |
4585 | ||
4586 | fd = atoi (entry->d_name); | |
4587 | if (!fd) | |
4588 | continue; | |
4589 | ||
4590 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4591 | if (stat (path, &st) != 0) | |
4592 | continue; | |
4593 | if (!S_ISDIR (st.st_mode)) | |
4594 | continue; | |
4595 | ||
4596 | if (statfs (path, &stfs) != 0) | |
4597 | continue; | |
4598 | if (stfs.f_type != SPUFS_MAGIC) | |
4599 | continue; | |
4600 | ||
4601 | if (pos >= offset && pos + 4 <= offset + len) | |
4602 | { | |
4603 | *(unsigned int *)(buf + pos - offset) = fd; | |
4604 | written += 4; | |
4605 | } | |
4606 | pos += 4; | |
4607 | } | |
4608 | ||
4609 | closedir (dir); | |
4610 | return written; | |
4611 | } | |
4612 | ||
4613 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4614 | object type, using the /proc file system. */ | |
4615 | static int | |
4616 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4617 | unsigned const char *writebuf, | |
4618 | CORE_ADDR offset, int len) | |
4619 | { | |
4620 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4621 | char buf[128]; | |
4622 | int fd = 0; | |
4623 | int ret = 0; | |
4624 | ||
4625 | if (!writebuf && !readbuf) | |
4626 | return -1; | |
4627 | ||
4628 | if (!*annex) | |
4629 | { | |
4630 | if (!readbuf) | |
4631 | return -1; | |
4632 | else | |
4633 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4634 | } | |
4635 | ||
4636 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
4637 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4638 | if (fd <= 0) | |
4639 | return -1; | |
4640 | ||
4641 | if (offset != 0 | |
4642 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4643 | { | |
4644 | close (fd); | |
4645 | return 0; | |
4646 | } | |
4647 | ||
4648 | if (writebuf) | |
4649 | ret = write (fd, writebuf, (size_t) len); | |
4650 | else | |
4651 | ret = read (fd, readbuf, (size_t) len); | |
4652 | ||
4653 | close (fd); | |
4654 | return ret; | |
4655 | } | |
4656 | ||
78d85199 YQ |
4657 | #if defined PT_GETDSBT |
4658 | struct target_loadseg | |
4659 | { | |
4660 | /* Core address to which the segment is mapped. */ | |
4661 | Elf32_Addr addr; | |
4662 | /* VMA recorded in the program header. */ | |
4663 | Elf32_Addr p_vaddr; | |
4664 | /* Size of this segment in memory. */ | |
4665 | Elf32_Word p_memsz; | |
4666 | }; | |
4667 | ||
4668 | struct target_loadmap | |
4669 | { | |
4670 | /* Protocol version number, must be zero. */ | |
4671 | Elf32_Word version; | |
4672 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
4673 | unsigned *dsbt_table; | |
4674 | unsigned dsbt_size, dsbt_index; | |
4675 | /* Number of segments in this map. */ | |
4676 | Elf32_Word nsegs; | |
4677 | /* The actual memory map. */ | |
4678 | struct target_loadseg segs[/*nsegs*/]; | |
4679 | }; | |
4680 | #endif | |
4681 | ||
4682 | #if defined PT_GETDSBT | |
4683 | static int | |
4684 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
4685 | unsigned char *myaddr, unsigned int len) | |
4686 | { | |
4687 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4688 | int addr = -1; | |
4689 | struct target_loadmap *data = NULL; | |
4690 | unsigned int actual_length, copy_length; | |
4691 | ||
4692 | if (strcmp (annex, "exec") == 0) | |
4693 | addr= (int) PTRACE_GETDSBT_EXEC; | |
4694 | else if (strcmp (annex, "interp") == 0) | |
4695 | addr = (int) PTRACE_GETDSBT_INTERP; | |
4696 | else | |
4697 | return -1; | |
4698 | ||
4699 | if (ptrace (PT_GETDSBT, pid, addr, &data) != 0) | |
4700 | return -1; | |
4701 | ||
4702 | if (data == NULL) | |
4703 | return -1; | |
4704 | ||
4705 | actual_length = sizeof (struct target_loadmap) | |
4706 | + sizeof (struct target_loadseg) * data->nsegs; | |
4707 | ||
4708 | if (offset < 0 || offset > actual_length) | |
4709 | return -1; | |
4710 | ||
4711 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
4712 | memcpy (myaddr, (char *) data + offset, copy_length); | |
4713 | return copy_length; | |
4714 | } | |
4715 | #endif /* defined PT_GETDSBT */ | |
4716 | ||
1570b33e L |
4717 | static void |
4718 | linux_process_qsupported (const char *query) | |
4719 | { | |
4720 | if (the_low_target.process_qsupported != NULL) | |
4721 | the_low_target.process_qsupported (query); | |
4722 | } | |
4723 | ||
219f2f23 PA |
4724 | static int |
4725 | linux_supports_tracepoints (void) | |
4726 | { | |
4727 | if (*the_low_target.supports_tracepoints == NULL) | |
4728 | return 0; | |
4729 | ||
4730 | return (*the_low_target.supports_tracepoints) (); | |
4731 | } | |
4732 | ||
4733 | static CORE_ADDR | |
4734 | linux_read_pc (struct regcache *regcache) | |
4735 | { | |
4736 | if (the_low_target.get_pc == NULL) | |
4737 | return 0; | |
4738 | ||
4739 | return (*the_low_target.get_pc) (regcache); | |
4740 | } | |
4741 | ||
4742 | static void | |
4743 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
4744 | { | |
4745 | gdb_assert (the_low_target.set_pc != NULL); | |
4746 | ||
4747 | (*the_low_target.set_pc) (regcache, pc); | |
4748 | } | |
4749 | ||
8336d594 PA |
4750 | static int |
4751 | linux_thread_stopped (struct thread_info *thread) | |
4752 | { | |
4753 | return get_thread_lwp (thread)->stopped; | |
4754 | } | |
4755 | ||
4756 | /* This exposes stop-all-threads functionality to other modules. */ | |
4757 | ||
4758 | static void | |
7984d532 | 4759 | linux_pause_all (int freeze) |
8336d594 | 4760 | { |
7984d532 PA |
4761 | stop_all_lwps (freeze, NULL); |
4762 | } | |
4763 | ||
4764 | /* This exposes unstop-all-threads functionality to other gdbserver | |
4765 | modules. */ | |
4766 | ||
4767 | static void | |
4768 | linux_unpause_all (int unfreeze) | |
4769 | { | |
4770 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
4771 | } |
4772 | ||
90d74c30 PA |
4773 | static int |
4774 | linux_prepare_to_access_memory (void) | |
4775 | { | |
4776 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
4777 | running LWP. */ | |
4778 | if (non_stop) | |
4779 | linux_pause_all (1); | |
4780 | return 0; | |
4781 | } | |
4782 | ||
4783 | static void | |
0146f85b | 4784 | linux_done_accessing_memory (void) |
90d74c30 PA |
4785 | { |
4786 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
4787 | running LWP. */ | |
4788 | if (non_stop) | |
4789 | linux_unpause_all (1); | |
4790 | } | |
4791 | ||
fa593d66 PA |
4792 | static int |
4793 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
4794 | CORE_ADDR collector, | |
4795 | CORE_ADDR lockaddr, | |
4796 | ULONGEST orig_size, | |
4797 | CORE_ADDR *jump_entry, | |
4798 | unsigned char *jjump_pad_insn, | |
4799 | ULONGEST *jjump_pad_insn_size, | |
4800 | CORE_ADDR *adjusted_insn_addr, | |
4801 | CORE_ADDR *adjusted_insn_addr_end) | |
4802 | { | |
4803 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
4804 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
4805 | jump_entry, jjump_pad_insn, jjump_pad_insn_size, | |
4806 | adjusted_insn_addr, adjusted_insn_addr_end); | |
4807 | } | |
4808 | ||
6a271cae PA |
4809 | static struct emit_ops * |
4810 | linux_emit_ops (void) | |
4811 | { | |
4812 | if (the_low_target.emit_ops != NULL) | |
4813 | return (*the_low_target.emit_ops) (); | |
4814 | else | |
4815 | return NULL; | |
4816 | } | |
4817 | ||
ce3a066d DJ |
4818 | static struct target_ops linux_target_ops = { |
4819 | linux_create_inferior, | |
4820 | linux_attach, | |
4821 | linux_kill, | |
6ad8ae5c | 4822 | linux_detach, |
8336d594 | 4823 | linux_mourn, |
444d6139 | 4824 | linux_join, |
ce3a066d DJ |
4825 | linux_thread_alive, |
4826 | linux_resume, | |
4827 | linux_wait, | |
4828 | linux_fetch_registers, | |
4829 | linux_store_registers, | |
90d74c30 | 4830 | linux_prepare_to_access_memory, |
0146f85b | 4831 | linux_done_accessing_memory, |
ce3a066d DJ |
4832 | linux_read_memory, |
4833 | linux_write_memory, | |
2f2893d9 | 4834 | linux_look_up_symbols, |
ef57601b | 4835 | linux_request_interrupt, |
aa691b87 | 4836 | linux_read_auxv, |
d993e290 PA |
4837 | linux_insert_point, |
4838 | linux_remove_point, | |
e013ee27 OF |
4839 | linux_stopped_by_watchpoint, |
4840 | linux_stopped_data_address, | |
42c81e2a | 4841 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 4842 | linux_read_offsets, |
dae5f5cf DJ |
4843 | #else |
4844 | NULL, | |
4845 | #endif | |
4846 | #ifdef USE_THREAD_DB | |
4847 | thread_db_get_tls_address, | |
4848 | #else | |
4849 | NULL, | |
52fb6437 | 4850 | #endif |
efcbbd14 | 4851 | linux_qxfer_spu, |
59a016f0 | 4852 | hostio_last_error_from_errno, |
07e059b5 | 4853 | linux_qxfer_osdata, |
4aa995e1 | 4854 | linux_xfer_siginfo, |
bd99dc85 PA |
4855 | linux_supports_non_stop, |
4856 | linux_async, | |
4857 | linux_start_non_stop, | |
cdbfd419 PP |
4858 | linux_supports_multi_process, |
4859 | #ifdef USE_THREAD_DB | |
dc146f7c | 4860 | thread_db_handle_monitor_command, |
cdbfd419 | 4861 | #else |
dc146f7c | 4862 | NULL, |
cdbfd419 | 4863 | #endif |
d26e3629 | 4864 | linux_common_core_of_thread, |
78d85199 YQ |
4865 | #if defined PT_GETDSBT |
4866 | linux_read_loadmap, | |
4867 | #else | |
4868 | NULL, | |
4869 | #endif | |
219f2f23 PA |
4870 | linux_process_qsupported, |
4871 | linux_supports_tracepoints, | |
4872 | linux_read_pc, | |
8336d594 PA |
4873 | linux_write_pc, |
4874 | linux_thread_stopped, | |
7984d532 | 4875 | NULL, |
711e434b | 4876 | linux_pause_all, |
7984d532 | 4877 | linux_unpause_all, |
fa593d66 PA |
4878 | linux_cancel_breakpoints, |
4879 | linux_stabilize_threads, | |
6a271cae PA |
4880 | linux_install_fast_tracepoint_jump_pad, |
4881 | linux_emit_ops | |
ce3a066d DJ |
4882 | }; |
4883 | ||
0d62e5e8 DJ |
4884 | static void |
4885 | linux_init_signals () | |
4886 | { | |
4887 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
4888 | to find what the cancel signal actually is. */ | |
1a981360 | 4889 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 4890 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 4891 | #endif |
0d62e5e8 DJ |
4892 | } |
4893 | ||
da6d8c04 DJ |
4894 | void |
4895 | initialize_low (void) | |
4896 | { | |
bd99dc85 PA |
4897 | struct sigaction sigchld_action; |
4898 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 4899 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
4900 | set_breakpoint_data (the_low_target.breakpoint, |
4901 | the_low_target.breakpoint_len); | |
0d62e5e8 | 4902 | linux_init_signals (); |
24a09b5f | 4903 | linux_test_for_tracefork (); |
52fa2412 UW |
4904 | #ifdef HAVE_LINUX_REGSETS |
4905 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
4906 | ; | |
bca929d3 | 4907 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 4908 | #endif |
bd99dc85 PA |
4909 | |
4910 | sigchld_action.sa_handler = sigchld_handler; | |
4911 | sigemptyset (&sigchld_action.sa_mask); | |
4912 | sigchld_action.sa_flags = SA_RESTART; | |
4913 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 4914 | } |