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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
545587ee | 2 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
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" |
e3deef73 | 29 | #include "linux-procfs.h" |
da6d8c04 DJ |
30 | #include <signal.h> |
31 | #include <sys/ioctl.h> | |
32 | #include <fcntl.h> | |
d07c63e7 | 33 | #include <string.h> |
0a30fbc4 DJ |
34 | #include <stdlib.h> |
35 | #include <unistd.h> | |
fa6a77dc | 36 | #include <errno.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
efcbbd14 UW |
43 | #include <sys/stat.h> |
44 | #include <sys/vfs.h> | |
1570b33e | 45 | #include <sys/uio.h> |
957f3f49 DE |
46 | #ifndef ELFMAG0 |
47 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
48 | then ELFMAG0 will have been defined. If it didn't get included by | |
49 | gdb_proc_service.h then including it will likely introduce a duplicate | |
50 | definition of elf_fpregset_t. */ | |
51 | #include <elf.h> | |
52 | #endif | |
efcbbd14 UW |
53 | |
54 | #ifndef SPUFS_MAGIC | |
55 | #define SPUFS_MAGIC 0x23c9b64e | |
56 | #endif | |
da6d8c04 | 57 | |
03583c20 UW |
58 | #ifdef HAVE_PERSONALITY |
59 | # include <sys/personality.h> | |
60 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
61 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
62 | # endif | |
63 | #endif | |
64 | ||
fd462a61 DJ |
65 | #ifndef O_LARGEFILE |
66 | #define O_LARGEFILE 0 | |
67 | #endif | |
68 | ||
ec8ebe72 DE |
69 | #ifndef W_STOPCODE |
70 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
71 | #endif | |
72 | ||
1a981360 PA |
73 | /* This is the kernel's hard limit. Not to be confused with |
74 | SIGRTMIN. */ | |
75 | #ifndef __SIGRTMIN | |
76 | #define __SIGRTMIN 32 | |
77 | #endif | |
78 | ||
42c81e2a DJ |
79 | #ifdef __UCLIBC__ |
80 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
81 | #define HAS_NOMMU | |
82 | #endif | |
83 | #endif | |
84 | ||
24a09b5f DJ |
85 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
86 | representation of the thread ID. | |
611cb4a5 | 87 | |
54a0b537 | 88 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
89 | the same as the LWP ID. |
90 | ||
91 | ``all_processes'' is keyed by the "overall process ID", which | |
92 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 93 | |
54a0b537 | 94 | struct inferior_list all_lwps; |
0d62e5e8 | 95 | |
24a09b5f DJ |
96 | /* A list of all unknown processes which receive stop signals. Some other |
97 | process will presumably claim each of these as forked children | |
98 | momentarily. */ | |
99 | ||
100 | struct inferior_list stopped_pids; | |
101 | ||
0d62e5e8 DJ |
102 | /* FIXME this is a bit of a hack, and could be removed. */ |
103 | int stopping_threads; | |
104 | ||
105 | /* FIXME make into a target method? */ | |
24a09b5f | 106 | int using_threads = 1; |
24a09b5f | 107 | |
fa593d66 PA |
108 | /* True if we're presently stabilizing threads (moving them out of |
109 | jump pads). */ | |
110 | static int stabilizing_threads; | |
111 | ||
95954743 PA |
112 | /* This flag is true iff we've just created or attached to our first |
113 | inferior but it has not stopped yet. As soon as it does, we need | |
114 | to call the low target's arch_setup callback. Doing this only on | |
115 | the first inferior avoids reinializing the architecture on every | |
116 | inferior, and avoids messing with the register caches of the | |
117 | already running inferiors. NOTE: this assumes all inferiors under | |
118 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
119 | static int new_inferior; |
120 | ||
2acc282a | 121 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 122 | int step, int signal, siginfo_t *info); |
2bd7c093 | 123 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
124 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
125 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 126 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 127 | static void *add_lwp (ptid_t ptid); |
c35fafde | 128 | static int linux_stopped_by_watchpoint (void); |
95954743 | 129 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 130 | static void proceed_all_lwps (void); |
d50171e4 PA |
131 | static int finish_step_over (struct lwp_info *lwp); |
132 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
133 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 134 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
135 | |
136 | /* True if the low target can hardware single-step. Such targets | |
137 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
138 | ||
139 | static int | |
140 | can_hardware_single_step (void) | |
141 | { | |
142 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
143 | } | |
144 | ||
145 | /* True if the low target supports memory breakpoints. If so, we'll | |
146 | have a GET_PC implementation. */ | |
147 | ||
148 | static int | |
149 | supports_breakpoints (void) | |
150 | { | |
151 | return (the_low_target.get_pc != NULL); | |
152 | } | |
0d62e5e8 | 153 | |
fa593d66 PA |
154 | /* Returns true if this target can support fast tracepoints. This |
155 | does not mean that the in-process agent has been loaded in the | |
156 | inferior. */ | |
157 | ||
158 | static int | |
159 | supports_fast_tracepoints (void) | |
160 | { | |
161 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
162 | } | |
163 | ||
0d62e5e8 DJ |
164 | struct pending_signals |
165 | { | |
166 | int signal; | |
32ca6d61 | 167 | siginfo_t info; |
0d62e5e8 DJ |
168 | struct pending_signals *prev; |
169 | }; | |
611cb4a5 | 170 | |
14ce3065 DE |
171 | #define PTRACE_ARG3_TYPE void * |
172 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 173 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 174 | |
58caa3dc | 175 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
176 | static char *disabled_regsets; |
177 | static int num_regsets; | |
58caa3dc DJ |
178 | #endif |
179 | ||
bd99dc85 PA |
180 | /* The read/write ends of the pipe registered as waitable file in the |
181 | event loop. */ | |
182 | static int linux_event_pipe[2] = { -1, -1 }; | |
183 | ||
184 | /* True if we're currently in async mode. */ | |
185 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
186 | ||
02fc4de7 | 187 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
188 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
189 | ||
d0722149 DE |
190 | /* Accepts an integer PID; Returns a string representing a file that |
191 | can be opened to get info for the child process. | |
192 | Space for the result is malloc'd, caller must free. */ | |
193 | ||
194 | char * | |
195 | linux_child_pid_to_exec_file (int pid) | |
196 | { | |
197 | char *name1, *name2; | |
198 | ||
199 | name1 = xmalloc (MAXPATHLEN); | |
200 | name2 = xmalloc (MAXPATHLEN); | |
201 | memset (name2, 0, MAXPATHLEN); | |
202 | ||
203 | sprintf (name1, "/proc/%d/exe", pid); | |
204 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
205 | { | |
206 | free (name1); | |
207 | return name2; | |
208 | } | |
209 | else | |
210 | { | |
211 | free (name2); | |
212 | return name1; | |
213 | } | |
214 | } | |
215 | ||
216 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
217 | ||
218 | static int | |
957f3f49 | 219 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
220 | { |
221 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
222 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
223 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
224 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
225 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
226 | } | |
227 | ||
228 | /* Return non-zero if FILE is a 64-bit ELF file, | |
229 | zero if the file is not a 64-bit ELF file, | |
230 | and -1 if the file is not accessible or doesn't exist. */ | |
231 | ||
232 | int | |
233 | elf_64_file_p (const char *file) | |
234 | { | |
957f3f49 | 235 | Elf64_Ehdr header; |
d0722149 DE |
236 | int fd; |
237 | ||
238 | fd = open (file, O_RDONLY); | |
239 | if (fd < 0) | |
240 | return -1; | |
241 | ||
242 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
243 | { | |
244 | close (fd); | |
245 | return 0; | |
246 | } | |
247 | close (fd); | |
248 | ||
249 | return elf_64_header_p (&header); | |
250 | } | |
251 | ||
bd99dc85 PA |
252 | static void |
253 | delete_lwp (struct lwp_info *lwp) | |
254 | { | |
255 | remove_thread (get_lwp_thread (lwp)); | |
256 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 257 | free (lwp->arch_private); |
bd99dc85 PA |
258 | free (lwp); |
259 | } | |
260 | ||
95954743 PA |
261 | /* Add a process to the common process list, and set its private |
262 | data. */ | |
263 | ||
264 | static struct process_info * | |
265 | linux_add_process (int pid, int attached) | |
266 | { | |
267 | struct process_info *proc; | |
268 | ||
269 | /* Is this the first process? If so, then set the arch. */ | |
270 | if (all_processes.head == NULL) | |
271 | new_inferior = 1; | |
272 | ||
273 | proc = add_process (pid, attached); | |
274 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
275 | ||
aa5ca48f DE |
276 | if (the_low_target.new_process != NULL) |
277 | proc->private->arch_private = the_low_target.new_process (); | |
278 | ||
95954743 PA |
279 | return proc; |
280 | } | |
281 | ||
07d4f67e DE |
282 | /* Wrapper function for waitpid which handles EINTR, and emulates |
283 | __WALL for systems where that is not available. */ | |
284 | ||
285 | static int | |
286 | my_waitpid (int pid, int *status, int flags) | |
287 | { | |
288 | int ret, out_errno; | |
289 | ||
290 | if (debug_threads) | |
291 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
292 | ||
293 | if (flags & __WALL) | |
294 | { | |
295 | sigset_t block_mask, org_mask, wake_mask; | |
296 | int wnohang; | |
297 | ||
298 | wnohang = (flags & WNOHANG) != 0; | |
299 | flags &= ~(__WALL | __WCLONE); | |
300 | flags |= WNOHANG; | |
301 | ||
302 | /* Block all signals while here. This avoids knowing about | |
303 | LinuxThread's signals. */ | |
304 | sigfillset (&block_mask); | |
305 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
306 | ||
307 | /* ... except during the sigsuspend below. */ | |
308 | sigemptyset (&wake_mask); | |
309 | ||
310 | while (1) | |
311 | { | |
312 | /* Since all signals are blocked, there's no need to check | |
313 | for EINTR here. */ | |
314 | ret = waitpid (pid, status, flags); | |
315 | out_errno = errno; | |
316 | ||
317 | if (ret == -1 && out_errno != ECHILD) | |
318 | break; | |
319 | else if (ret > 0) | |
320 | break; | |
321 | ||
322 | if (flags & __WCLONE) | |
323 | { | |
324 | /* We've tried both flavors now. If WNOHANG is set, | |
325 | there's nothing else to do, just bail out. */ | |
326 | if (wnohang) | |
327 | break; | |
328 | ||
329 | if (debug_threads) | |
330 | fprintf (stderr, "blocking\n"); | |
331 | ||
332 | /* Block waiting for signals. */ | |
333 | sigsuspend (&wake_mask); | |
334 | } | |
335 | ||
336 | flags ^= __WCLONE; | |
337 | } | |
338 | ||
339 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
340 | } | |
341 | else | |
342 | { | |
343 | do | |
344 | ret = waitpid (pid, status, flags); | |
345 | while (ret == -1 && errno == EINTR); | |
346 | out_errno = errno; | |
347 | } | |
348 | ||
349 | if (debug_threads) | |
350 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
351 | pid, flags, status ? *status : -1, ret); | |
352 | ||
353 | errno = out_errno; | |
354 | return ret; | |
355 | } | |
356 | ||
bd99dc85 PA |
357 | /* Handle a GNU/Linux extended wait response. If we see a clone |
358 | event, we need to add the new LWP to our list (and not report the | |
359 | trap to higher layers). */ | |
0d62e5e8 | 360 | |
24a09b5f | 361 | static void |
54a0b537 | 362 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
363 | { |
364 | int event = wstat >> 16; | |
54a0b537 | 365 | struct lwp_info *new_lwp; |
24a09b5f DJ |
366 | |
367 | if (event == PTRACE_EVENT_CLONE) | |
368 | { | |
95954743 | 369 | ptid_t ptid; |
24a09b5f | 370 | unsigned long new_pid; |
836acd6d | 371 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 372 | |
bd99dc85 | 373 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
374 | |
375 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
376 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
377 | { | |
378 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
379 | hits the SIGSTOP, but we're already attached. */ | |
380 | ||
97438e3f | 381 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
382 | |
383 | if (ret == -1) | |
384 | perror_with_name ("waiting for new child"); | |
385 | else if (ret != new_pid) | |
386 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 387 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
388 | warning ("wait returned unexpected status 0x%x", status); |
389 | } | |
390 | ||
1e7fc18c | 391 | linux_enable_event_reporting (new_pid); |
24a09b5f | 392 | |
95954743 PA |
393 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
394 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
395 | add_thread (ptid, new_lwp); | |
24a09b5f | 396 | |
e27d73f6 DE |
397 | /* Either we're going to immediately resume the new thread |
398 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
399 | thinks the thread is currently running, so set this first | |
400 | before calling linux_resume_one_lwp. */ | |
401 | new_lwp->stopped = 1; | |
402 | ||
da5898ce DJ |
403 | /* Normally we will get the pending SIGSTOP. But in some cases |
404 | we might get another signal delivered to the group first. | |
f21cc1a2 | 405 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
406 | if (WSTOPSIG (status) == SIGSTOP) |
407 | { | |
d50171e4 PA |
408 | if (stopping_threads) |
409 | new_lwp->stop_pc = get_stop_pc (new_lwp); | |
410 | else | |
e27d73f6 | 411 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 412 | } |
24a09b5f | 413 | else |
da5898ce | 414 | { |
54a0b537 | 415 | new_lwp->stop_expected = 1; |
d50171e4 | 416 | |
da5898ce DJ |
417 | if (stopping_threads) |
418 | { | |
d50171e4 | 419 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
420 | new_lwp->status_pending_p = 1; |
421 | new_lwp->status_pending = status; | |
da5898ce DJ |
422 | } |
423 | else | |
424 | /* Pass the signal on. This is what GDB does - except | |
425 | shouldn't we really report it instead? */ | |
e27d73f6 | 426 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 427 | } |
24a09b5f DJ |
428 | |
429 | /* Always resume the current thread. If we are stopping | |
430 | threads, it will have a pending SIGSTOP; we may as well | |
431 | collect it now. */ | |
2acc282a | 432 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
433 | } |
434 | } | |
435 | ||
d50171e4 PA |
436 | /* Return the PC as read from the regcache of LWP, without any |
437 | adjustment. */ | |
438 | ||
439 | static CORE_ADDR | |
440 | get_pc (struct lwp_info *lwp) | |
441 | { | |
442 | struct thread_info *saved_inferior; | |
443 | struct regcache *regcache; | |
444 | CORE_ADDR pc; | |
445 | ||
446 | if (the_low_target.get_pc == NULL) | |
447 | return 0; | |
448 | ||
449 | saved_inferior = current_inferior; | |
450 | current_inferior = get_lwp_thread (lwp); | |
451 | ||
452 | regcache = get_thread_regcache (current_inferior, 1); | |
453 | pc = (*the_low_target.get_pc) (regcache); | |
454 | ||
455 | if (debug_threads) | |
456 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
457 | ||
458 | current_inferior = saved_inferior; | |
459 | return pc; | |
460 | } | |
461 | ||
462 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
463 | The SIGTRAP could mean several things. |
464 | ||
465 | On i386, where decr_pc_after_break is non-zero: | |
466 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
467 | we will get only the one SIGTRAP (even if the instruction we | |
468 | stepped over was a breakpoint). The value of $eip will be the | |
469 | next instruction. | |
470 | If we continue the process using PTRACE_CONT, we will get a | |
471 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
472 | the instruction after the breakpoint (i.e. needs to be | |
473 | decremented). If we report the SIGTRAP to GDB, we must also | |
474 | report the undecremented PC. If we cancel the SIGTRAP, we | |
475 | must resume at the decremented PC. | |
476 | ||
477 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
478 | with hardware or kernel single-step: | |
479 | If we single-step over a breakpoint instruction, our PC will | |
480 | point at the following instruction. If we continue and hit a | |
481 | breakpoint instruction, our PC will point at the breakpoint | |
482 | instruction. */ | |
483 | ||
484 | static CORE_ADDR | |
d50171e4 | 485 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 486 | { |
d50171e4 PA |
487 | CORE_ADDR stop_pc; |
488 | ||
489 | if (the_low_target.get_pc == NULL) | |
490 | return 0; | |
0d62e5e8 | 491 | |
d50171e4 PA |
492 | stop_pc = get_pc (lwp); |
493 | ||
bdabb078 PA |
494 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
495 | && !lwp->stepping | |
496 | && !lwp->stopped_by_watchpoint | |
497 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
498 | stop_pc -= the_low_target.decr_pc_after_break; |
499 | ||
500 | if (debug_threads) | |
501 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
502 | ||
503 | return stop_pc; | |
0d62e5e8 | 504 | } |
ce3a066d | 505 | |
0d62e5e8 | 506 | static void * |
95954743 | 507 | add_lwp (ptid_t ptid) |
611cb4a5 | 508 | { |
54a0b537 | 509 | struct lwp_info *lwp; |
0d62e5e8 | 510 | |
54a0b537 PA |
511 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
512 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 513 | |
95954743 | 514 | lwp->head.id = ptid; |
0d62e5e8 | 515 | |
aa5ca48f DE |
516 | if (the_low_target.new_thread != NULL) |
517 | lwp->arch_private = the_low_target.new_thread (); | |
518 | ||
54a0b537 | 519 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 520 | |
54a0b537 | 521 | return lwp; |
0d62e5e8 | 522 | } |
611cb4a5 | 523 | |
da6d8c04 DJ |
524 | /* Start an inferior process and returns its pid. |
525 | ALLARGS is a vector of program-name and args. */ | |
526 | ||
ce3a066d DJ |
527 | static int |
528 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 529 | { |
03583c20 UW |
530 | #ifdef HAVE_PERSONALITY |
531 | int personality_orig = 0, personality_set = 0; | |
532 | #endif | |
a6dbe5df | 533 | struct lwp_info *new_lwp; |
da6d8c04 | 534 | int pid; |
95954743 | 535 | ptid_t ptid; |
da6d8c04 | 536 | |
03583c20 UW |
537 | #ifdef HAVE_PERSONALITY |
538 | if (disable_randomization) | |
539 | { | |
540 | errno = 0; | |
541 | personality_orig = personality (0xffffffff); | |
542 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
543 | { | |
544 | personality_set = 1; | |
545 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
546 | } | |
547 | if (errno != 0 || (personality_set | |
548 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
549 | warning ("Error disabling address space randomization: %s", | |
550 | strerror (errno)); | |
551 | } | |
552 | #endif | |
553 | ||
42c81e2a | 554 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
555 | pid = vfork (); |
556 | #else | |
da6d8c04 | 557 | pid = fork (); |
52fb6437 | 558 | #endif |
da6d8c04 DJ |
559 | if (pid < 0) |
560 | perror_with_name ("fork"); | |
561 | ||
562 | if (pid == 0) | |
563 | { | |
564 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
565 | ||
1a981360 | 566 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 567 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 568 | #endif |
0d62e5e8 | 569 | |
a9fa9f7d DJ |
570 | setpgid (0, 0); |
571 | ||
2b876972 DJ |
572 | execv (program, allargs); |
573 | if (errno == ENOENT) | |
574 | execvp (program, allargs); | |
da6d8c04 DJ |
575 | |
576 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 577 | strerror (errno)); |
da6d8c04 DJ |
578 | fflush (stderr); |
579 | _exit (0177); | |
580 | } | |
581 | ||
03583c20 UW |
582 | #ifdef HAVE_PERSONALITY |
583 | if (personality_set) | |
584 | { | |
585 | errno = 0; | |
586 | personality (personality_orig); | |
587 | if (errno != 0) | |
588 | warning ("Error restoring address space randomization: %s", | |
589 | strerror (errno)); | |
590 | } | |
591 | #endif | |
592 | ||
95954743 PA |
593 | linux_add_process (pid, 0); |
594 | ||
595 | ptid = ptid_build (pid, pid, 0); | |
596 | new_lwp = add_lwp (ptid); | |
597 | add_thread (ptid, new_lwp); | |
a6dbe5df | 598 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 599 | |
a9fa9f7d | 600 | return pid; |
da6d8c04 DJ |
601 | } |
602 | ||
603 | /* Attach to an inferior process. */ | |
604 | ||
95954743 PA |
605 | static void |
606 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 607 | { |
95954743 | 608 | ptid_t ptid; |
54a0b537 | 609 | struct lwp_info *new_lwp; |
611cb4a5 | 610 | |
95954743 | 611 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 612 | { |
95954743 | 613 | if (!initial) |
2d717e4f DJ |
614 | { |
615 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 616 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
617 | strerror (errno), errno); |
618 | fflush (stderr); | |
619 | return; | |
620 | } | |
621 | else | |
622 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 623 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 624 | strerror (errno), errno); |
da6d8c04 DJ |
625 | } |
626 | ||
95954743 | 627 | if (initial) |
e3deef73 LM |
628 | /* If lwp is the tgid, we handle adding existing threads later. |
629 | Otherwise we just add lwp without bothering about any other | |
630 | threads. */ | |
95954743 PA |
631 | ptid = ptid_build (lwpid, lwpid, 0); |
632 | else | |
633 | { | |
634 | /* Note that extracting the pid from the current inferior is | |
635 | safe, since we're always called in the context of the same | |
636 | process as this new thread. */ | |
637 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
638 | ptid = ptid_build (pid, lwpid, 0); | |
639 | } | |
24a09b5f | 640 | |
95954743 PA |
641 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
642 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 643 | |
a6dbe5df PA |
644 | /* We need to wait for SIGSTOP before being able to make the next |
645 | ptrace call on this LWP. */ | |
646 | new_lwp->must_set_ptrace_flags = 1; | |
647 | ||
0d62e5e8 | 648 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
649 | brings it to a halt. |
650 | ||
651 | There are several cases to consider here: | |
652 | ||
653 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 654 | of a new thread that is being created. |
d50171e4 PA |
655 | In this case we should ignore that SIGSTOP and resume the |
656 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 657 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 658 | resume_continue. |
0e21c1ec DE |
659 | |
660 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
661 | to it via attach_inferior. |
662 | In this case we want the process thread to stop. | |
d50171e4 PA |
663 | This is handled by having linux_attach set last_resume_kind == |
664 | resume_stop after we return. | |
e3deef73 LM |
665 | |
666 | If the pid we are attaching to is also the tgid, we attach to and | |
667 | stop all the existing threads. Otherwise, we attach to pid and | |
668 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
669 | |
670 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
671 | existing threads. |
672 | In this case we want the thread to stop. | |
673 | FIXME: This case is currently not properly handled. | |
674 | We should wait for the SIGSTOP but don't. Things work apparently | |
675 | because enough time passes between when we ptrace (ATTACH) and when | |
676 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
677 | |
678 | On the other hand, if we are currently trying to stop all threads, we | |
679 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 680 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
681 | end of the list, and so the new thread has not yet reached |
682 | wait_for_sigstop (but will). */ | |
d50171e4 | 683 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
684 | } |
685 | ||
95954743 PA |
686 | void |
687 | linux_attach_lwp (unsigned long lwpid) | |
688 | { | |
689 | linux_attach_lwp_1 (lwpid, 0); | |
690 | } | |
691 | ||
e3deef73 LM |
692 | /* Attach to PID. If PID is the tgid, attach to it and all |
693 | of its threads. */ | |
694 | ||
0d62e5e8 | 695 | int |
a1928bad | 696 | linux_attach (unsigned long pid) |
0d62e5e8 | 697 | { |
e3deef73 LM |
698 | /* Attach to PID. We will check for other threads |
699 | soon. */ | |
95954743 | 700 | linux_attach_lwp_1 (pid, 1); |
95954743 | 701 | linux_add_process (pid, 1); |
0d62e5e8 | 702 | |
bd99dc85 PA |
703 | if (!non_stop) |
704 | { | |
8336d594 PA |
705 | struct thread_info *thread; |
706 | ||
707 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
708 | process. It will be collected by wait shortly. */ | |
709 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
710 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 711 | } |
0d62e5e8 | 712 | |
e3deef73 LM |
713 | if (linux_proc_get_tgid (pid) == pid) |
714 | { | |
715 | DIR *dir; | |
716 | char pathname[128]; | |
717 | ||
718 | sprintf (pathname, "/proc/%ld/task", pid); | |
719 | ||
720 | dir = opendir (pathname); | |
721 | ||
722 | if (!dir) | |
723 | { | |
724 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
725 | fflush (stderr); | |
726 | } | |
727 | else | |
728 | { | |
729 | /* At this point we attached to the tgid. Scan the task for | |
730 | existing threads. */ | |
731 | unsigned long lwp; | |
732 | int new_threads_found; | |
733 | int iterations = 0; | |
734 | struct dirent *dp; | |
735 | ||
736 | while (iterations < 2) | |
737 | { | |
738 | new_threads_found = 0; | |
739 | /* Add all the other threads. While we go through the | |
740 | threads, new threads may be spawned. Cycle through | |
741 | the list of threads until we have done two iterations without | |
742 | finding new threads. */ | |
743 | while ((dp = readdir (dir)) != NULL) | |
744 | { | |
745 | /* Fetch one lwp. */ | |
746 | lwp = strtoul (dp->d_name, NULL, 10); | |
747 | ||
748 | /* Is this a new thread? */ | |
749 | if (lwp | |
750 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
751 | { | |
752 | linux_attach_lwp_1 (lwp, 0); | |
753 | new_threads_found++; | |
754 | ||
755 | if (debug_threads) | |
756 | fprintf (stderr, "\ | |
757 | Found and attached to new lwp %ld\n", lwp); | |
758 | } | |
759 | } | |
760 | ||
761 | if (!new_threads_found) | |
762 | iterations++; | |
763 | else | |
764 | iterations = 0; | |
765 | ||
766 | rewinddir (dir); | |
767 | } | |
768 | closedir (dir); | |
769 | } | |
770 | } | |
771 | ||
95954743 PA |
772 | return 0; |
773 | } | |
774 | ||
775 | struct counter | |
776 | { | |
777 | int pid; | |
778 | int count; | |
779 | }; | |
780 | ||
781 | static int | |
782 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
783 | { | |
784 | struct counter *counter = args; | |
785 | ||
786 | if (ptid_get_pid (entry->id) == counter->pid) | |
787 | { | |
788 | if (++counter->count > 1) | |
789 | return 1; | |
790 | } | |
d61ddec4 | 791 | |
da6d8c04 DJ |
792 | return 0; |
793 | } | |
794 | ||
95954743 PA |
795 | static int |
796 | last_thread_of_process_p (struct thread_info *thread) | |
797 | { | |
798 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
799 | int pid = ptid_get_pid (ptid); | |
800 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 801 | |
95954743 PA |
802 | return (find_inferior (&all_threads, |
803 | second_thread_of_pid_p, &counter) == NULL); | |
804 | } | |
805 | ||
806 | /* Kill the inferior lwp. */ | |
807 | ||
808 | static int | |
809 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 810 | { |
0d62e5e8 | 811 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 812 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 813 | int wstat; |
95954743 PA |
814 | int pid = * (int *) args; |
815 | ||
816 | if (ptid_get_pid (entry->id) != pid) | |
817 | return 0; | |
0d62e5e8 | 818 | |
fd500816 DJ |
819 | /* We avoid killing the first thread here, because of a Linux kernel (at |
820 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
821 | the children get a chance to be reaped, it will remain a zombie | |
822 | forever. */ | |
95954743 | 823 | |
12b42a12 | 824 | if (lwpid_of (lwp) == pid) |
95954743 PA |
825 | { |
826 | if (debug_threads) | |
827 | fprintf (stderr, "lkop: is last of process %s\n", | |
828 | target_pid_to_str (entry->id)); | |
829 | return 0; | |
830 | } | |
fd500816 | 831 | |
0d62e5e8 DJ |
832 | do |
833 | { | |
bd99dc85 | 834 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
835 | |
836 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 837 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 838 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
839 | |
840 | return 0; | |
da6d8c04 DJ |
841 | } |
842 | ||
95954743 PA |
843 | static int |
844 | linux_kill (int pid) | |
0d62e5e8 | 845 | { |
95954743 | 846 | struct process_info *process; |
54a0b537 | 847 | struct lwp_info *lwp; |
fd500816 | 848 | int wstat; |
95954743 | 849 | int lwpid; |
fd500816 | 850 | |
95954743 PA |
851 | process = find_process_pid (pid); |
852 | if (process == NULL) | |
853 | return -1; | |
9d606399 | 854 | |
f9e39928 PA |
855 | /* If we're killing a running inferior, make sure it is stopped |
856 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 857 | stop_all_lwps (0, NULL); |
f9e39928 | 858 | |
95954743 | 859 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 860 | |
54a0b537 | 861 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 862 | thread in the list, so do so now. */ |
95954743 | 863 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 864 | |
784867a5 | 865 | if (lwp == NULL) |
fd500816 | 866 | { |
784867a5 JK |
867 | if (debug_threads) |
868 | fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n", | |
869 | lwpid_of (lwp), pid); | |
870 | } | |
871 | else | |
872 | { | |
873 | if (debug_threads) | |
874 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", | |
875 | lwpid_of (lwp), pid); | |
fd500816 | 876 | |
784867a5 JK |
877 | do |
878 | { | |
879 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); | |
880 | ||
881 | /* Make sure it died. The loop is most likely unnecessary. */ | |
882 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); | |
883 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
884 | } | |
2d717e4f | 885 | |
8336d594 | 886 | the_target->mourn (process); |
f9e39928 PA |
887 | |
888 | /* Since we presently can only stop all lwps of all processes, we | |
889 | need to unstop lwps of other processes. */ | |
7984d532 | 890 | unstop_all_lwps (0, NULL); |
95954743 | 891 | return 0; |
0d62e5e8 DJ |
892 | } |
893 | ||
95954743 PA |
894 | static int |
895 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
896 | { |
897 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 898 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
899 | int pid = * (int *) args; |
900 | ||
901 | if (ptid_get_pid (entry->id) != pid) | |
902 | return 0; | |
6ad8ae5c | 903 | |
ae13219e DJ |
904 | /* If this process is stopped but is expecting a SIGSTOP, then make |
905 | sure we take care of that now. This isn't absolutely guaranteed | |
906 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 907 | if (lwp->stop_expected) |
ae13219e | 908 | { |
bd99dc85 | 909 | int wstat; |
ae13219e | 910 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 | 911 | lwp->stop_expected = 0; |
f9e39928 | 912 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 913 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
914 | } |
915 | ||
916 | /* Flush any pending changes to the process's registers. */ | |
917 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 918 | get_lwp_thread (lwp)); |
ae13219e DJ |
919 | |
920 | /* Finally, let it resume. */ | |
82bfbe7e PA |
921 | if (the_low_target.prepare_to_resume != NULL) |
922 | the_low_target.prepare_to_resume (lwp); | |
bd99dc85 PA |
923 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
924 | ||
925 | delete_lwp (lwp); | |
95954743 | 926 | return 0; |
6ad8ae5c DJ |
927 | } |
928 | ||
95954743 PA |
929 | static int |
930 | linux_detach (int pid) | |
931 | { | |
932 | struct process_info *process; | |
933 | ||
934 | process = find_process_pid (pid); | |
935 | if (process == NULL) | |
936 | return -1; | |
937 | ||
f9e39928 PA |
938 | /* Stop all threads before detaching. First, ptrace requires that |
939 | the thread is stopped to sucessfully detach. Second, thread_db | |
940 | may need to uninstall thread event breakpoints from memory, which | |
941 | only works with a stopped process anyway. */ | |
7984d532 | 942 | stop_all_lwps (0, NULL); |
f9e39928 | 943 | |
ca5c370d | 944 | #ifdef USE_THREAD_DB |
8336d594 | 945 | thread_db_detach (process); |
ca5c370d PA |
946 | #endif |
947 | ||
fa593d66 PA |
948 | /* Stabilize threads (move out of jump pads). */ |
949 | stabilize_threads (); | |
950 | ||
95954743 | 951 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
952 | |
953 | the_target->mourn (process); | |
f9e39928 PA |
954 | |
955 | /* Since we presently can only stop all lwps of all processes, we | |
956 | need to unstop lwps of other processes. */ | |
7984d532 | 957 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
958 | return 0; |
959 | } | |
960 | ||
961 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
962 | ||
963 | static int | |
964 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
965 | { | |
966 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
967 | struct process_info *process = proc; | |
968 | ||
969 | if (pid_of (lwp) == pid_of (process)) | |
970 | delete_lwp (lwp); | |
971 | ||
dd6953e1 | 972 | return 0; |
6ad8ae5c DJ |
973 | } |
974 | ||
8336d594 PA |
975 | static void |
976 | linux_mourn (struct process_info *process) | |
977 | { | |
978 | struct process_info_private *priv; | |
979 | ||
980 | #ifdef USE_THREAD_DB | |
981 | thread_db_mourn (process); | |
982 | #endif | |
983 | ||
f9e39928 PA |
984 | find_inferior (&all_lwps, delete_lwp_callback, process); |
985 | ||
8336d594 PA |
986 | /* Freeing all private data. */ |
987 | priv = process->private; | |
988 | free (priv->arch_private); | |
989 | free (priv); | |
990 | process->private = NULL; | |
505106cd PA |
991 | |
992 | remove_process (process); | |
8336d594 PA |
993 | } |
994 | ||
444d6139 | 995 | static void |
95954743 | 996 | linux_join (int pid) |
444d6139 | 997 | { |
444d6139 PA |
998 | int status, ret; |
999 | ||
1000 | do { | |
95954743 | 1001 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1002 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1003 | break; | |
1004 | } while (ret != -1 || errno != ECHILD); | |
1005 | } | |
1006 | ||
6ad8ae5c | 1007 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1008 | static int |
95954743 | 1009 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1010 | { |
95954743 PA |
1011 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1012 | ||
1013 | /* We assume we always know if a thread exits. If a whole process | |
1014 | exited but we still haven't been able to report it to GDB, we'll | |
1015 | hold on to the last lwp of the dead process. */ | |
1016 | if (lwp != NULL) | |
1017 | return !lwp->dead; | |
0d62e5e8 DJ |
1018 | else |
1019 | return 0; | |
1020 | } | |
1021 | ||
6bf5e0ba | 1022 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1023 | static int |
d50171e4 | 1024 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1025 | { |
54a0b537 | 1026 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1027 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1028 | struct thread_info *thread; |
95954743 PA |
1029 | |
1030 | /* Check if we're only interested in events from a specific process | |
1031 | or its lwps. */ | |
1032 | if (!ptid_equal (minus_one_ptid, ptid) | |
1033 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
1034 | return 0; | |
0d62e5e8 | 1035 | |
d50171e4 PA |
1036 | thread = get_lwp_thread (lwp); |
1037 | ||
1038 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1039 | report any status pending the LWP may have. */ | |
8336d594 | 1040 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1041 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1042 | return 0; |
0d62e5e8 | 1043 | |
d50171e4 | 1044 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1045 | } |
1046 | ||
95954743 PA |
1047 | static int |
1048 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1049 | { | |
1050 | ptid_t ptid = *(ptid_t *) data; | |
1051 | int lwp; | |
1052 | ||
1053 | if (ptid_get_lwp (ptid) != 0) | |
1054 | lwp = ptid_get_lwp (ptid); | |
1055 | else | |
1056 | lwp = ptid_get_pid (ptid); | |
1057 | ||
1058 | if (ptid_get_lwp (entry->id) == lwp) | |
1059 | return 1; | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
1064 | struct lwp_info * | |
1065 | find_lwp_pid (ptid_t ptid) | |
1066 | { | |
1067 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1068 | } | |
1069 | ||
bd99dc85 | 1070 | static struct lwp_info * |
95954743 | 1071 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1072 | { |
0d62e5e8 | 1073 | int ret; |
95954743 | 1074 | int to_wait_for = -1; |
bd99dc85 | 1075 | struct lwp_info *child = NULL; |
0d62e5e8 | 1076 | |
bd99dc85 | 1077 | if (debug_threads) |
95954743 PA |
1078 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1079 | ||
1080 | if (ptid_equal (ptid, minus_one_ptid)) | |
1081 | to_wait_for = -1; /* any child */ | |
1082 | else | |
1083 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1084 | |
bd99dc85 | 1085 | options |= __WALL; |
0d62e5e8 | 1086 | |
bd99dc85 | 1087 | retry: |
0d62e5e8 | 1088 | |
bd99dc85 PA |
1089 | ret = my_waitpid (to_wait_for, wstatp, options); |
1090 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1091 | return NULL; | |
1092 | else if (ret == -1) | |
1093 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1094 | |
1095 | if (debug_threads | |
1096 | && (!WIFSTOPPED (*wstatp) | |
1097 | || (WSTOPSIG (*wstatp) != 32 | |
1098 | && WSTOPSIG (*wstatp) != 33))) | |
1099 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1100 | ||
95954743 | 1101 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1102 | |
24a09b5f DJ |
1103 | /* If we didn't find a process, one of two things presumably happened: |
1104 | - A process we started and then detached from has exited. Ignore it. | |
1105 | - A process we are controlling has forked and the new child's stop | |
1106 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1107 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1108 | { |
1109 | add_pid_to_list (&stopped_pids, ret); | |
1110 | goto retry; | |
1111 | } | |
bd99dc85 | 1112 | else if (child == NULL) |
24a09b5f DJ |
1113 | goto retry; |
1114 | ||
bd99dc85 | 1115 | child->stopped = 1; |
0d62e5e8 | 1116 | |
bd99dc85 | 1117 | child->last_status = *wstatp; |
32ca6d61 | 1118 | |
d61ddec4 UW |
1119 | /* Architecture-specific setup after inferior is running. |
1120 | This needs to happen after we have attached to the inferior | |
1121 | and it is stopped for the first time, but before we access | |
1122 | any inferior registers. */ | |
1123 | if (new_inferior) | |
1124 | { | |
1125 | the_low_target.arch_setup (); | |
52fa2412 UW |
1126 | #ifdef HAVE_LINUX_REGSETS |
1127 | memset (disabled_regsets, 0, num_regsets); | |
1128 | #endif | |
d61ddec4 UW |
1129 | new_inferior = 0; |
1130 | } | |
1131 | ||
c3adc08c PA |
1132 | /* Fetch the possibly triggered data watchpoint info and store it in |
1133 | CHILD. | |
1134 | ||
1135 | On some archs, like x86, that use debug registers to set | |
1136 | watchpoints, it's possible that the way to know which watched | |
1137 | address trapped, is to check the register that is used to select | |
1138 | which address to watch. Problem is, between setting the | |
1139 | watchpoint and reading back which data address trapped, the user | |
1140 | may change the set of watchpoints, and, as a consequence, GDB | |
1141 | changes the debug registers in the inferior. To avoid reading | |
1142 | back a stale stopped-data-address when that happens, we cache in | |
1143 | LP the fact that a watchpoint trapped, and the corresponding data | |
1144 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1145 | changes the debug registers meanwhile, we have the cached data we | |
1146 | can rely on. */ | |
1147 | ||
1148 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1149 | { | |
1150 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1151 | { | |
1152 | child->stopped_by_watchpoint = 0; | |
1153 | } | |
1154 | else | |
1155 | { | |
1156 | struct thread_info *saved_inferior; | |
1157 | ||
1158 | saved_inferior = current_inferior; | |
1159 | current_inferior = get_lwp_thread (child); | |
1160 | ||
1161 | child->stopped_by_watchpoint | |
1162 | = the_low_target.stopped_by_watchpoint (); | |
1163 | ||
1164 | if (child->stopped_by_watchpoint) | |
1165 | { | |
1166 | if (the_low_target.stopped_data_address != NULL) | |
1167 | child->stopped_data_address | |
1168 | = the_low_target.stopped_data_address (); | |
1169 | else | |
1170 | child->stopped_data_address = 0; | |
1171 | } | |
1172 | ||
1173 | current_inferior = saved_inferior; | |
1174 | } | |
1175 | } | |
1176 | ||
d50171e4 PA |
1177 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1178 | architecture being defined already (so that CHILD has a valid | |
1179 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1180 | not). */ | |
1181 | if (WIFSTOPPED (*wstatp)) | |
1182 | child->stop_pc = get_stop_pc (child); | |
1183 | ||
0d62e5e8 | 1184 | if (debug_threads |
47c0c975 DE |
1185 | && WIFSTOPPED (*wstatp) |
1186 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1187 | { |
896c7fbb | 1188 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1189 | struct regcache *regcache; |
47c0c975 DE |
1190 | CORE_ADDR pc; |
1191 | ||
d50171e4 | 1192 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1193 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1194 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1195 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1196 | current_inferior = saved_inferior; |
0d62e5e8 | 1197 | } |
bd99dc85 PA |
1198 | |
1199 | return child; | |
0d62e5e8 | 1200 | } |
611cb4a5 | 1201 | |
219f2f23 PA |
1202 | /* This function should only be called if the LWP got a SIGTRAP. |
1203 | ||
1204 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1205 | event was handled, 0 otherwise. */ | |
1206 | ||
1207 | static int | |
1208 | handle_tracepoints (struct lwp_info *lwp) | |
1209 | { | |
1210 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1211 | int tpoint_related_event = 0; | |
1212 | ||
7984d532 PA |
1213 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1214 | uninsert tracepoints. To do this, we temporarily pause all | |
1215 | threads, unpatch away, and then unpause threads. We need to make | |
1216 | sure the unpausing doesn't resume LWP too. */ | |
1217 | lwp->suspended++; | |
1218 | ||
219f2f23 PA |
1219 | /* And we need to be sure that any all-threads-stopping doesn't try |
1220 | to move threads out of the jump pads, as it could deadlock the | |
1221 | inferior (LWP could be in the jump pad, maybe even holding the | |
1222 | lock.) */ | |
1223 | ||
1224 | /* Do any necessary step collect actions. */ | |
1225 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1226 | ||
fa593d66 PA |
1227 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1228 | ||
219f2f23 PA |
1229 | /* See if we just hit a tracepoint and do its main collect |
1230 | actions. */ | |
1231 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1232 | ||
7984d532 PA |
1233 | lwp->suspended--; |
1234 | ||
1235 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1236 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1237 | |
219f2f23 PA |
1238 | if (tpoint_related_event) |
1239 | { | |
1240 | if (debug_threads) | |
1241 | fprintf (stderr, "got a tracepoint event\n"); | |
1242 | return 1; | |
1243 | } | |
1244 | ||
1245 | return 0; | |
1246 | } | |
1247 | ||
fa593d66 PA |
1248 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1249 | fast tracepoint. */ | |
1250 | ||
1251 | static int | |
1252 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1253 | struct fast_tpoint_collect_status *status) | |
1254 | { | |
1255 | CORE_ADDR thread_area; | |
1256 | ||
1257 | if (the_low_target.get_thread_area == NULL) | |
1258 | return 0; | |
1259 | ||
1260 | /* Get the thread area address. This is used to recognize which | |
1261 | thread is which when tracing with the in-process agent library. | |
1262 | We don't read anything from the address, and treat it as opaque; | |
1263 | it's the address itself that we assume is unique per-thread. */ | |
1264 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1265 | return 0; | |
1266 | ||
1267 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1268 | } | |
1269 | ||
1270 | /* The reason we resume in the caller, is because we want to be able | |
1271 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1272 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1273 | refuses to resume. */ | |
1274 | ||
1275 | static int | |
1276 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1277 | { | |
1278 | struct thread_info *saved_inferior; | |
1279 | ||
1280 | saved_inferior = current_inferior; | |
1281 | current_inferior = get_lwp_thread (lwp); | |
1282 | ||
1283 | if ((wstat == NULL | |
1284 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1285 | && supports_fast_tracepoints () | |
1286 | && in_process_agent_loaded ()) | |
1287 | { | |
1288 | struct fast_tpoint_collect_status status; | |
1289 | int r; | |
1290 | ||
1291 | if (debug_threads) | |
1292 | fprintf (stderr, "\ | |
1293 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1294 | lwpid_of (lwp)); | |
1295 | ||
1296 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1297 | ||
1298 | if (wstat == NULL | |
1299 | || (WSTOPSIG (*wstat) != SIGILL | |
1300 | && WSTOPSIG (*wstat) != SIGFPE | |
1301 | && WSTOPSIG (*wstat) != SIGSEGV | |
1302 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1303 | { | |
1304 | lwp->collecting_fast_tracepoint = r; | |
1305 | ||
1306 | if (r != 0) | |
1307 | { | |
1308 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1309 | { | |
1310 | /* Haven't executed the original instruction yet. | |
1311 | Set breakpoint there, and wait till it's hit, | |
1312 | then single-step until exiting the jump pad. */ | |
1313 | lwp->exit_jump_pad_bkpt | |
1314 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1315 | } | |
1316 | ||
1317 | if (debug_threads) | |
1318 | fprintf (stderr, "\ | |
1319 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1320 | lwpid_of (lwp)); | |
0cccb683 | 1321 | current_inferior = saved_inferior; |
fa593d66 PA |
1322 | |
1323 | return 1; | |
1324 | } | |
1325 | } | |
1326 | else | |
1327 | { | |
1328 | /* If we get a synchronous signal while collecting, *and* | |
1329 | while executing the (relocated) original instruction, | |
1330 | reset the PC to point at the tpoint address, before | |
1331 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1332 | report the signal to GDB, and pray for the best. */ | |
1333 | ||
1334 | lwp->collecting_fast_tracepoint = 0; | |
1335 | ||
1336 | if (r != 0 | |
1337 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1338 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1339 | { | |
1340 | siginfo_t info; | |
1341 | struct regcache *regcache; | |
1342 | ||
1343 | /* The si_addr on a few signals references the address | |
1344 | of the faulting instruction. Adjust that as | |
1345 | well. */ | |
1346 | if ((WSTOPSIG (*wstat) == SIGILL | |
1347 | || WSTOPSIG (*wstat) == SIGFPE | |
1348 | || WSTOPSIG (*wstat) == SIGBUS | |
1349 | || WSTOPSIG (*wstat) == SIGSEGV) | |
1350 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &info) == 0 | |
1351 | /* Final check just to make sure we don't clobber | |
1352 | the siginfo of non-kernel-sent signals. */ | |
1353 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1354 | { | |
1355 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
1356 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &info); | |
1357 | } | |
1358 | ||
1359 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1360 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1361 | lwp->stop_pc = status.tpoint_addr; | |
1362 | ||
1363 | /* Cancel any fast tracepoint lock this thread was | |
1364 | holding. */ | |
1365 | force_unlock_trace_buffer (); | |
1366 | } | |
1367 | ||
1368 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1369 | { | |
1370 | if (debug_threads) | |
1371 | fprintf (stderr, | |
1372 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1373 | "stopping all threads momentarily.\n"); | |
1374 | ||
1375 | stop_all_lwps (1, lwp); | |
1376 | cancel_breakpoints (); | |
1377 | ||
1378 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1379 | lwp->exit_jump_pad_bkpt = NULL; | |
1380 | ||
1381 | unstop_all_lwps (1, lwp); | |
1382 | ||
1383 | gdb_assert (lwp->suspended >= 0); | |
1384 | } | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | if (debug_threads) | |
1389 | fprintf (stderr, "\ | |
1390 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1391 | lwpid_of (lwp)); | |
0cccb683 YQ |
1392 | |
1393 | current_inferior = saved_inferior; | |
fa593d66 PA |
1394 | return 0; |
1395 | } | |
1396 | ||
1397 | /* Enqueue one signal in the "signals to report later when out of the | |
1398 | jump pad" list. */ | |
1399 | ||
1400 | static void | |
1401 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1402 | { | |
1403 | struct pending_signals *p_sig; | |
1404 | ||
1405 | if (debug_threads) | |
1406 | fprintf (stderr, "\ | |
1407 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1408 | ||
1409 | if (debug_threads) | |
1410 | { | |
1411 | struct pending_signals *sig; | |
1412 | ||
1413 | for (sig = lwp->pending_signals_to_report; | |
1414 | sig != NULL; | |
1415 | sig = sig->prev) | |
1416 | fprintf (stderr, | |
1417 | " Already queued %d\n", | |
1418 | sig->signal); | |
1419 | ||
1420 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1421 | } | |
1422 | ||
1a981360 PA |
1423 | /* Don't enqueue non-RT signals if they are already in the deferred |
1424 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1425 | twice) */ | |
1426 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1427 | { | |
1428 | struct pending_signals *sig; | |
1429 | ||
1430 | for (sig = lwp->pending_signals_to_report; | |
1431 | sig != NULL; | |
1432 | sig = sig->prev) | |
1433 | { | |
1434 | if (sig->signal == WSTOPSIG (*wstat)) | |
1435 | { | |
1436 | if (debug_threads) | |
1437 | fprintf (stderr, | |
1438 | "Not requeuing already queued non-RT signal %d" | |
1439 | " for LWP %ld\n", | |
1440 | sig->signal, | |
1441 | lwpid_of (lwp)); | |
1442 | return; | |
1443 | } | |
1444 | } | |
1445 | } | |
1446 | ||
fa593d66 PA |
1447 | p_sig = xmalloc (sizeof (*p_sig)); |
1448 | p_sig->prev = lwp->pending_signals_to_report; | |
1449 | p_sig->signal = WSTOPSIG (*wstat); | |
1450 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
1451 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
1452 | ||
1453 | lwp->pending_signals_to_report = p_sig; | |
1454 | } | |
1455 | ||
1456 | /* Dequeue one signal from the "signals to report later when out of | |
1457 | the jump pad" list. */ | |
1458 | ||
1459 | static int | |
1460 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1461 | { | |
1462 | if (lwp->pending_signals_to_report != NULL) | |
1463 | { | |
1464 | struct pending_signals **p_sig; | |
1465 | ||
1466 | p_sig = &lwp->pending_signals_to_report; | |
1467 | while ((*p_sig)->prev != NULL) | |
1468 | p_sig = &(*p_sig)->prev; | |
1469 | ||
1470 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1471 | if ((*p_sig)->info.si_signo != 0) | |
1472 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); | |
1473 | free (*p_sig); | |
1474 | *p_sig = NULL; | |
1475 | ||
1476 | if (debug_threads) | |
1477 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1478 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1479 | ||
1480 | if (debug_threads) | |
1481 | { | |
1482 | struct pending_signals *sig; | |
1483 | ||
1484 | for (sig = lwp->pending_signals_to_report; | |
1485 | sig != NULL; | |
1486 | sig = sig->prev) | |
1487 | fprintf (stderr, | |
1488 | " Still queued %d\n", | |
1489 | sig->signal); | |
1490 | ||
1491 | fprintf (stderr, " (no more queued signals)\n"); | |
1492 | } | |
1493 | ||
1494 | return 1; | |
1495 | } | |
1496 | ||
1497 | return 0; | |
1498 | } | |
1499 | ||
d50171e4 PA |
1500 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1501 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1502 | will handle the current event, eventually we will resume this LWP, | |
1503 | and this breakpoint will trap again. */ | |
1504 | ||
1505 | static int | |
1506 | cancel_breakpoint (struct lwp_info *lwp) | |
1507 | { | |
1508 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1509 | |
1510 | /* There's nothing to do if we don't support breakpoints. */ | |
1511 | if (!supports_breakpoints ()) | |
1512 | return 0; | |
1513 | ||
d50171e4 PA |
1514 | /* breakpoint_at reads from current inferior. */ |
1515 | saved_inferior = current_inferior; | |
1516 | current_inferior = get_lwp_thread (lwp); | |
1517 | ||
1518 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1519 | { | |
1520 | if (debug_threads) | |
1521 | fprintf (stderr, | |
1522 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1523 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1524 | |
1525 | /* Back up the PC if necessary. */ | |
1526 | if (the_low_target.decr_pc_after_break) | |
1527 | { | |
1528 | struct regcache *regcache | |
fc7238bb | 1529 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1530 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1531 | } | |
1532 | ||
1533 | current_inferior = saved_inferior; | |
1534 | return 1; | |
1535 | } | |
1536 | else | |
1537 | { | |
1538 | if (debug_threads) | |
1539 | fprintf (stderr, | |
1540 | "CB: No breakpoint found at %s for [%s]\n", | |
1541 | paddress (lwp->stop_pc), | |
fc7238bb | 1542 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1543 | } |
1544 | ||
1545 | current_inferior = saved_inferior; | |
1546 | return 0; | |
1547 | } | |
1548 | ||
1549 | /* When the event-loop is doing a step-over, this points at the thread | |
1550 | being stepped. */ | |
1551 | ptid_t step_over_bkpt; | |
1552 | ||
bd99dc85 PA |
1553 | /* Wait for an event from child PID. If PID is -1, wait for any |
1554 | child. Store the stop status through the status pointer WSTAT. | |
1555 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1556 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1557 | the stopped child otherwise. */ | |
1558 | ||
0d62e5e8 | 1559 | static int |
95954743 | 1560 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1561 | { |
d50171e4 PA |
1562 | struct lwp_info *event_child, *requested_child; |
1563 | ||
d50171e4 PA |
1564 | event_child = NULL; |
1565 | requested_child = NULL; | |
0d62e5e8 | 1566 | |
95954743 | 1567 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1568 | |
95954743 PA |
1569 | if (ptid_equal (ptid, minus_one_ptid) |
1570 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1571 | { |
54a0b537 | 1572 | event_child = (struct lwp_info *) |
d50171e4 | 1573 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1574 | if (debug_threads && event_child) |
bd99dc85 | 1575 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1576 | } |
1577 | else | |
1578 | { | |
95954743 | 1579 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1580 | |
fa593d66 PA |
1581 | if (!stopping_threads |
1582 | && requested_child->status_pending_p | |
1583 | && requested_child->collecting_fast_tracepoint) | |
1584 | { | |
1585 | enqueue_one_deferred_signal (requested_child, | |
1586 | &requested_child->status_pending); | |
1587 | requested_child->status_pending_p = 0; | |
1588 | requested_child->status_pending = 0; | |
1589 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1590 | } | |
1591 | ||
1592 | if (requested_child->suspended | |
1593 | && requested_child->status_pending_p) | |
1594 | fatal ("requesting an event out of a suspended child?"); | |
1595 | ||
d50171e4 | 1596 | if (requested_child->status_pending_p) |
bd99dc85 | 1597 | event_child = requested_child; |
0d62e5e8 | 1598 | } |
611cb4a5 | 1599 | |
0d62e5e8 DJ |
1600 | if (event_child != NULL) |
1601 | { | |
bd99dc85 PA |
1602 | if (debug_threads) |
1603 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1604 | lwpid_of (event_child), event_child->status_pending); | |
1605 | *wstat = event_child->status_pending; | |
1606 | event_child->status_pending_p = 0; | |
1607 | event_child->status_pending = 0; | |
1608 | current_inferior = get_lwp_thread (event_child); | |
1609 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1610 | } |
1611 | ||
1612 | /* We only enter this loop if no process has a pending wait status. Thus | |
1613 | any action taken in response to a wait status inside this loop is | |
1614 | responding as soon as we detect the status, not after any pending | |
1615 | events. */ | |
1616 | while (1) | |
1617 | { | |
6bf5e0ba | 1618 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1619 | |
bd99dc85 | 1620 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1621 | { |
1622 | if (debug_threads) | |
1623 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1624 | return 0; | |
1625 | } | |
0d62e5e8 DJ |
1626 | |
1627 | if (event_child == NULL) | |
1628 | error ("event from unknown child"); | |
611cb4a5 | 1629 | |
bd99dc85 | 1630 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1631 | |
89be2091 | 1632 | /* Check for thread exit. */ |
bd99dc85 | 1633 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1634 | { |
89be2091 | 1635 | if (debug_threads) |
95954743 | 1636 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1637 | |
1638 | /* If the last thread is exiting, just return. */ | |
95954743 | 1639 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1640 | { |
1641 | if (debug_threads) | |
95954743 PA |
1642 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1643 | lwpid_of (event_child)); | |
bd99dc85 PA |
1644 | return lwpid_of (event_child); |
1645 | } | |
89be2091 | 1646 | |
bd99dc85 PA |
1647 | if (!non_stop) |
1648 | { | |
1649 | current_inferior = (struct thread_info *) all_threads.head; | |
1650 | if (debug_threads) | |
1651 | fprintf (stderr, "Current inferior is now %ld\n", | |
1652 | lwpid_of (get_thread_lwp (current_inferior))); | |
1653 | } | |
1654 | else | |
1655 | { | |
1656 | current_inferior = NULL; | |
1657 | if (debug_threads) | |
1658 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1659 | } | |
89be2091 DJ |
1660 | |
1661 | /* If we were waiting for this particular child to do something... | |
1662 | well, it did something. */ | |
bd99dc85 | 1663 | if (requested_child != NULL) |
d50171e4 PA |
1664 | { |
1665 | int lwpid = lwpid_of (event_child); | |
1666 | ||
1667 | /* Cancel the step-over operation --- the thread that | |
1668 | started it is gone. */ | |
1669 | if (finish_step_over (event_child)) | |
7984d532 | 1670 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1671 | delete_lwp (event_child); |
1672 | return lwpid; | |
1673 | } | |
1674 | ||
1675 | delete_lwp (event_child); | |
89be2091 DJ |
1676 | |
1677 | /* Wait for a more interesting event. */ | |
1678 | continue; | |
1679 | } | |
1680 | ||
a6dbe5df PA |
1681 | if (event_child->must_set_ptrace_flags) |
1682 | { | |
1e7fc18c | 1683 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1684 | event_child->must_set_ptrace_flags = 0; |
1685 | } | |
1686 | ||
bd99dc85 PA |
1687 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1688 | && *wstat >> 16 != 0) | |
24a09b5f | 1689 | { |
bd99dc85 | 1690 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1691 | continue; |
1692 | } | |
1693 | ||
d50171e4 PA |
1694 | if (WIFSTOPPED (*wstat) |
1695 | && WSTOPSIG (*wstat) == SIGSTOP | |
1696 | && event_child->stop_expected) | |
1697 | { | |
1698 | int should_stop; | |
1699 | ||
1700 | if (debug_threads) | |
1701 | fprintf (stderr, "Expected stop.\n"); | |
1702 | event_child->stop_expected = 0; | |
1703 | ||
8336d594 | 1704 | should_stop = (current_inferior->last_resume_kind == resume_stop |
d50171e4 PA |
1705 | || stopping_threads); |
1706 | ||
1707 | if (!should_stop) | |
1708 | { | |
1709 | linux_resume_one_lwp (event_child, | |
1710 | event_child->stepping, 0, NULL); | |
1711 | continue; | |
1712 | } | |
1713 | } | |
1714 | ||
bd99dc85 | 1715 | return lwpid_of (event_child); |
611cb4a5 | 1716 | } |
0d62e5e8 | 1717 | |
611cb4a5 DJ |
1718 | /* NOTREACHED */ |
1719 | return 0; | |
1720 | } | |
1721 | ||
95954743 PA |
1722 | static int |
1723 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1724 | { | |
1725 | ptid_t wait_ptid; | |
1726 | ||
1727 | if (ptid_is_pid (ptid)) | |
1728 | { | |
1729 | /* A request to wait for a specific tgid. This is not possible | |
1730 | with waitpid, so instead, we wait for any child, and leave | |
1731 | children we're not interested in right now with a pending | |
1732 | status to report later. */ | |
1733 | wait_ptid = minus_one_ptid; | |
1734 | } | |
1735 | else | |
1736 | wait_ptid = ptid; | |
1737 | ||
1738 | while (1) | |
1739 | { | |
1740 | int event_pid; | |
1741 | ||
1742 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1743 | ||
1744 | if (event_pid > 0 | |
1745 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1746 | { | |
493e2a69 MS |
1747 | struct lwp_info *event_child |
1748 | = find_lwp_pid (pid_to_ptid (event_pid)); | |
95954743 PA |
1749 | |
1750 | if (! WIFSTOPPED (*wstat)) | |
1751 | mark_lwp_dead (event_child, *wstat); | |
1752 | else | |
1753 | { | |
1754 | event_child->status_pending_p = 1; | |
1755 | event_child->status_pending = *wstat; | |
1756 | } | |
1757 | } | |
1758 | else | |
1759 | return event_pid; | |
1760 | } | |
1761 | } | |
1762 | ||
6bf5e0ba PA |
1763 | |
1764 | /* Count the LWP's that have had events. */ | |
1765 | ||
1766 | static int | |
1767 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1768 | { | |
1769 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1770 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1771 | int *count = data; |
1772 | ||
1773 | gdb_assert (count != NULL); | |
1774 | ||
1775 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1776 | should be reported to GDB. */ | |
8336d594 PA |
1777 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1778 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
1779 | && lp->status_pending_p |
1780 | && WIFSTOPPED (lp->status_pending) | |
1781 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1782 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1783 | (*count)++; | |
1784 | ||
1785 | return 0; | |
1786 | } | |
1787 | ||
1788 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1789 | ||
1790 | static int | |
1791 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1792 | { | |
1793 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1794 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 1795 | |
8336d594 PA |
1796 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1797 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
1798 | && lp->status_pending_p) |
1799 | return 1; | |
1800 | else | |
1801 | return 0; | |
1802 | } | |
1803 | ||
1804 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1805 | reported to GDB. */ | |
1806 | ||
1807 | static int | |
1808 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1809 | { | |
1810 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1811 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1812 | int *selector = data; |
1813 | ||
1814 | gdb_assert (selector != NULL); | |
1815 | ||
1816 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
1817 | if (thread->last_resume_kind != resume_stop |
1818 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1819 | && lp->status_pending_p |
1820 | && WIFSTOPPED (lp->status_pending) | |
1821 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1822 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1823 | if ((*selector)-- == 0) | |
1824 | return 1; | |
1825 | ||
1826 | return 0; | |
1827 | } | |
1828 | ||
1829 | static int | |
1830 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
1831 | { | |
1832 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1833 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1834 | struct lwp_info *event_lp = data; |
1835 | ||
1836 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1837 | if (lp == event_lp) | |
1838 | return 0; | |
1839 | ||
1840 | /* If a LWP other than the LWP that we're reporting an event for has | |
1841 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1842 | then just arrange for it to hit it again later. We don't keep | |
1843 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1844 | LWP. We will handle the current event, eventually we will resume | |
1845 | all LWPs, and this one will get its breakpoint trap again. | |
1846 | ||
1847 | If we do not do this, then we run the risk that the user will | |
1848 | delete or disable the breakpoint, but the LWP will have already | |
1849 | tripped on it. */ | |
1850 | ||
8336d594 PA |
1851 | if (thread->last_resume_kind != resume_stop |
1852 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1853 | && lp->status_pending_p |
1854 | && WIFSTOPPED (lp->status_pending) | |
1855 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
1856 | && !lp->stepping |
1857 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
1858 | && cancel_breakpoint (lp)) |
1859 | /* Throw away the SIGTRAP. */ | |
1860 | lp->status_pending_p = 0; | |
1861 | ||
1862 | return 0; | |
1863 | } | |
1864 | ||
7984d532 PA |
1865 | static void |
1866 | linux_cancel_breakpoints (void) | |
1867 | { | |
1868 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
1869 | } | |
1870 | ||
6bf5e0ba PA |
1871 | /* Select one LWP out of those that have events pending. */ |
1872 | ||
1873 | static void | |
1874 | select_event_lwp (struct lwp_info **orig_lp) | |
1875 | { | |
1876 | int num_events = 0; | |
1877 | int random_selector; | |
1878 | struct lwp_info *event_lp; | |
1879 | ||
1880 | /* Give preference to any LWP that is being single-stepped. */ | |
1881 | event_lp | |
1882 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1883 | select_singlestep_lwp_callback, NULL); | |
1884 | if (event_lp != NULL) | |
1885 | { | |
1886 | if (debug_threads) | |
1887 | fprintf (stderr, | |
1888 | "SEL: Select single-step %s\n", | |
1889 | target_pid_to_str (ptid_of (event_lp))); | |
1890 | } | |
1891 | else | |
1892 | { | |
1893 | /* No single-stepping LWP. Select one at random, out of those | |
1894 | which have had SIGTRAP events. */ | |
1895 | ||
1896 | /* First see how many SIGTRAP events we have. */ | |
1897 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
1898 | ||
1899 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1900 | random_selector = (int) | |
1901 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1902 | ||
1903 | if (debug_threads && num_events > 1) | |
1904 | fprintf (stderr, | |
1905 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1906 | num_events, random_selector); | |
1907 | ||
1908 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
1909 | select_event_lwp_callback, | |
1910 | &random_selector); | |
1911 | } | |
1912 | ||
1913 | if (event_lp != NULL) | |
1914 | { | |
1915 | /* Switch the event LWP. */ | |
1916 | *orig_lp = event_lp; | |
1917 | } | |
1918 | } | |
1919 | ||
7984d532 PA |
1920 | /* Decrement the suspend count of an LWP. */ |
1921 | ||
1922 | static int | |
1923 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
1924 | { | |
1925 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1926 | ||
1927 | /* Ignore EXCEPT. */ | |
1928 | if (lwp == except) | |
1929 | return 0; | |
1930 | ||
1931 | lwp->suspended--; | |
1932 | ||
1933 | gdb_assert (lwp->suspended >= 0); | |
1934 | return 0; | |
1935 | } | |
1936 | ||
1937 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
1938 | NULL. */ | |
1939 | ||
1940 | static void | |
1941 | unsuspend_all_lwps (struct lwp_info *except) | |
1942 | { | |
1943 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
1944 | } | |
1945 | ||
fa593d66 PA |
1946 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
1947 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
1948 | void *data); | |
1949 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
1950 | static ptid_t linux_wait_1 (ptid_t ptid, | |
1951 | struct target_waitstatus *ourstatus, | |
1952 | int target_options); | |
1953 | ||
1954 | /* Stabilize threads (move out of jump pads). | |
1955 | ||
1956 | If a thread is midway collecting a fast tracepoint, we need to | |
1957 | finish the collection and move it out of the jump pad before | |
1958 | reporting the signal. | |
1959 | ||
1960 | This avoids recursion while collecting (when a signal arrives | |
1961 | midway, and the signal handler itself collects), which would trash | |
1962 | the trace buffer. In case the user set a breakpoint in a signal | |
1963 | handler, this avoids the backtrace showing the jump pad, etc.. | |
1964 | Most importantly, there are certain things we can't do safely if | |
1965 | threads are stopped in a jump pad (or in its callee's). For | |
1966 | example: | |
1967 | ||
1968 | - starting a new trace run. A thread still collecting the | |
1969 | previous run, could trash the trace buffer when resumed. The trace | |
1970 | buffer control structures would have been reset but the thread had | |
1971 | no way to tell. The thread could even midway memcpy'ing to the | |
1972 | buffer, which would mean that when resumed, it would clobber the | |
1973 | trace buffer that had been set for a new run. | |
1974 | ||
1975 | - we can't rewrite/reuse the jump pads for new tracepoints | |
1976 | safely. Say you do tstart while a thread is stopped midway while | |
1977 | collecting. When the thread is later resumed, it finishes the | |
1978 | collection, and returns to the jump pad, to execute the original | |
1979 | instruction that was under the tracepoint jump at the time the | |
1980 | older run had been started. If the jump pad had been rewritten | |
1981 | since for something else in the new run, the thread would now | |
1982 | execute the wrong / random instructions. */ | |
1983 | ||
1984 | static void | |
1985 | linux_stabilize_threads (void) | |
1986 | { | |
1987 | struct thread_info *save_inferior; | |
1988 | struct lwp_info *lwp_stuck; | |
1989 | ||
1990 | lwp_stuck | |
1991 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1992 | stuck_in_jump_pad_callback, NULL); | |
1993 | if (lwp_stuck != NULL) | |
1994 | { | |
b4d51a55 PA |
1995 | if (debug_threads) |
1996 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
1997 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
1998 | return; |
1999 | } | |
2000 | ||
2001 | save_inferior = current_inferior; | |
2002 | ||
2003 | stabilizing_threads = 1; | |
2004 | ||
2005 | /* Kick 'em all. */ | |
2006 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2007 | ||
2008 | /* Loop until all are stopped out of the jump pads. */ | |
2009 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2010 | { | |
2011 | struct target_waitstatus ourstatus; | |
2012 | struct lwp_info *lwp; | |
fa593d66 PA |
2013 | int wstat; |
2014 | ||
2015 | /* Note that we go through the full wait even loop. While | |
2016 | moving threads out of jump pad, we need to be able to step | |
2017 | over internal breakpoints and such. */ | |
32fcada3 | 2018 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2019 | |
2020 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2021 | { | |
2022 | lwp = get_thread_lwp (current_inferior); | |
2023 | ||
2024 | /* Lock it. */ | |
2025 | lwp->suspended++; | |
2026 | ||
2027 | if (ourstatus.value.sig != TARGET_SIGNAL_0 | |
2028 | || current_inferior->last_resume_kind == resume_stop) | |
2029 | { | |
2030 | wstat = W_STOPCODE (target_signal_to_host (ourstatus.value.sig)); | |
2031 | enqueue_one_deferred_signal (lwp, &wstat); | |
2032 | } | |
2033 | } | |
2034 | } | |
2035 | ||
2036 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2037 | ||
2038 | stabilizing_threads = 0; | |
2039 | ||
2040 | current_inferior = save_inferior; | |
2041 | ||
b4d51a55 | 2042 | if (debug_threads) |
fa593d66 | 2043 | { |
b4d51a55 PA |
2044 | lwp_stuck |
2045 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2046 | stuck_in_jump_pad_callback, NULL); | |
2047 | if (lwp_stuck != NULL) | |
fa593d66 PA |
2048 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2049 | lwpid_of (lwp_stuck)); | |
2050 | } | |
2051 | } | |
2052 | ||
0d62e5e8 | 2053 | /* Wait for process, returns status. */ |
da6d8c04 | 2054 | |
95954743 PA |
2055 | static ptid_t |
2056 | linux_wait_1 (ptid_t ptid, | |
2057 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2058 | { |
e5f1222d | 2059 | int w; |
fc7238bb | 2060 | struct lwp_info *event_child; |
bd99dc85 | 2061 | int options; |
bd99dc85 | 2062 | int pid; |
6bf5e0ba PA |
2063 | int step_over_finished; |
2064 | int bp_explains_trap; | |
2065 | int maybe_internal_trap; | |
2066 | int report_to_gdb; | |
219f2f23 | 2067 | int trace_event; |
bd99dc85 PA |
2068 | |
2069 | /* Translate generic target options into linux options. */ | |
2070 | options = __WALL; | |
2071 | if (target_options & TARGET_WNOHANG) | |
2072 | options |= WNOHANG; | |
0d62e5e8 DJ |
2073 | |
2074 | retry: | |
fa593d66 PA |
2075 | bp_explains_trap = 0; |
2076 | trace_event = 0; | |
bd99dc85 PA |
2077 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2078 | ||
0d62e5e8 DJ |
2079 | /* If we were only supposed to resume one thread, only wait for |
2080 | that thread - if it's still alive. If it died, however - which | |
2081 | can happen if we're coming from the thread death case below - | |
2082 | then we need to make sure we restart the other threads. We could | |
2083 | pick a thread at random or restart all; restarting all is less | |
2084 | arbitrary. */ | |
95954743 PA |
2085 | if (!non_stop |
2086 | && !ptid_equal (cont_thread, null_ptid) | |
2087 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2088 | { |
fc7238bb PA |
2089 | struct thread_info *thread; |
2090 | ||
bd99dc85 PA |
2091 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2092 | cont_thread); | |
0d62e5e8 DJ |
2093 | |
2094 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2095 | if (thread == NULL) |
64386c31 DJ |
2096 | { |
2097 | struct thread_resume resume_info; | |
95954743 | 2098 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2099 | resume_info.kind = resume_continue; |
2100 | resume_info.sig = 0; | |
2bd7c093 | 2101 | linux_resume (&resume_info, 1); |
64386c31 | 2102 | } |
bd99dc85 | 2103 | else |
95954743 | 2104 | ptid = cont_thread; |
0d62e5e8 | 2105 | } |
da6d8c04 | 2106 | |
6bf5e0ba PA |
2107 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2108 | pid = linux_wait_for_event (ptid, &w, options); | |
2109 | else | |
2110 | { | |
2111 | if (debug_threads) | |
2112 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2113 | target_pid_to_str (step_over_bkpt)); | |
2114 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2115 | } | |
2116 | ||
bd99dc85 | 2117 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2118 | return null_ptid; |
bd99dc85 | 2119 | |
6bf5e0ba | 2120 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2121 | |
0d62e5e8 DJ |
2122 | /* If we are waiting for a particular child, and it exited, |
2123 | linux_wait_for_event will return its exit status. Similarly if | |
2124 | the last child exited. If this is not the last child, however, | |
2125 | do not report it as exited until there is a 'thread exited' response | |
2126 | available in the remote protocol. Instead, just wait for another event. | |
2127 | This should be safe, because if the thread crashed we will already | |
2128 | have reported the termination signal to GDB; that should stop any | |
2129 | in-progress stepping operations, etc. | |
2130 | ||
2131 | Report the exit status of the last thread to exit. This matches | |
2132 | LinuxThreads' behavior. */ | |
2133 | ||
95954743 | 2134 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2135 | { |
bd99dc85 | 2136 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2137 | { |
bd99dc85 PA |
2138 | if (WIFEXITED (w)) |
2139 | { | |
2140 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2141 | ourstatus->value.integer = WEXITSTATUS (w); | |
2142 | ||
2143 | if (debug_threads) | |
493e2a69 MS |
2144 | fprintf (stderr, |
2145 | "\nChild exited with retcode = %x \n", | |
2146 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2147 | } |
2148 | else | |
2149 | { | |
2150 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2151 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
2152 | ||
2153 | if (debug_threads) | |
493e2a69 MS |
2154 | fprintf (stderr, |
2155 | "\nChild terminated with signal = %x \n", | |
2156 | WTERMSIG (w)); | |
bd99dc85 PA |
2157 | |
2158 | } | |
5b1c542e | 2159 | |
3e4c1235 | 2160 | return ptid_of (event_child); |
0d62e5e8 | 2161 | } |
da6d8c04 | 2162 | } |
0d62e5e8 | 2163 | else |
da6d8c04 | 2164 | { |
0d62e5e8 DJ |
2165 | if (!WIFSTOPPED (w)) |
2166 | goto retry; | |
da6d8c04 DJ |
2167 | } |
2168 | ||
6bf5e0ba PA |
2169 | /* If this event was not handled before, and is not a SIGTRAP, we |
2170 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2171 | a breakpoint is inserted at the current PC. If this target does | |
2172 | not support internal breakpoints at all, we also report the | |
2173 | SIGTRAP without further processing; it's of no concern to us. */ | |
2174 | maybe_internal_trap | |
2175 | = (supports_breakpoints () | |
2176 | && (WSTOPSIG (w) == SIGTRAP | |
2177 | || ((WSTOPSIG (w) == SIGILL | |
2178 | || WSTOPSIG (w) == SIGSEGV) | |
2179 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2180 | ||
2181 | if (maybe_internal_trap) | |
2182 | { | |
2183 | /* Handle anything that requires bookkeeping before deciding to | |
2184 | report the event or continue waiting. */ | |
2185 | ||
2186 | /* First check if we can explain the SIGTRAP with an internal | |
2187 | breakpoint, or if we should possibly report the event to GDB. | |
2188 | Do this before anything that may remove or insert a | |
2189 | breakpoint. */ | |
2190 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2191 | ||
2192 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2193 | finished. If so, tweak the state machine accordingly, | |
2194 | reinsert breakpoints and delete any reinsert (software | |
2195 | single-step) breakpoints. */ | |
2196 | step_over_finished = finish_step_over (event_child); | |
2197 | ||
2198 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2199 | check_breakpoints (event_child->stop_pc); | |
2200 | ||
219f2f23 PA |
2201 | /* Handle tracepoint data collecting. This may overflow the |
2202 | trace buffer, and cause a tracing stop, removing | |
2203 | breakpoints. */ | |
2204 | trace_event = handle_tracepoints (event_child); | |
2205 | ||
6bf5e0ba PA |
2206 | if (bp_explains_trap) |
2207 | { | |
2208 | /* If we stepped or ran into an internal breakpoint, we've | |
2209 | already handled it. So next time we resume (from this | |
2210 | PC), we should step over it. */ | |
2211 | if (debug_threads) | |
2212 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2213 | ||
8b07ae33 PA |
2214 | if (breakpoint_here (event_child->stop_pc)) |
2215 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2216 | } |
2217 | } | |
2218 | else | |
2219 | { | |
2220 | /* We have some other signal, possibly a step-over dance was in | |
2221 | progress, and it should be cancelled too. */ | |
2222 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2223 | } |
2224 | ||
2225 | /* We have all the data we need. Either report the event to GDB, or | |
2226 | resume threads and keep waiting for more. */ | |
2227 | ||
2228 | /* If we're collecting a fast tracepoint, finish the collection and | |
2229 | move out of the jump pad before delivering a signal. See | |
2230 | linux_stabilize_threads. */ | |
2231 | ||
2232 | if (WIFSTOPPED (w) | |
2233 | && WSTOPSIG (w) != SIGTRAP | |
2234 | && supports_fast_tracepoints () | |
2235 | && in_process_agent_loaded ()) | |
2236 | { | |
2237 | if (debug_threads) | |
2238 | fprintf (stderr, | |
2239 | "Got signal %d for LWP %ld. Check if we need " | |
2240 | "to defer or adjust it.\n", | |
2241 | WSTOPSIG (w), lwpid_of (event_child)); | |
2242 | ||
2243 | /* Allow debugging the jump pad itself. */ | |
2244 | if (current_inferior->last_resume_kind != resume_step | |
2245 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2246 | { | |
2247 | enqueue_one_deferred_signal (event_child, &w); | |
2248 | ||
2249 | if (debug_threads) | |
2250 | fprintf (stderr, | |
2251 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2252 | WSTOPSIG (w), lwpid_of (event_child)); | |
2253 | ||
2254 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2255 | goto retry; | |
2256 | } | |
2257 | } | |
219f2f23 | 2258 | |
fa593d66 PA |
2259 | if (event_child->collecting_fast_tracepoint) |
2260 | { | |
2261 | if (debug_threads) | |
2262 | fprintf (stderr, "\ | |
2263 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2264 | Check if we're already there.\n", | |
2265 | lwpid_of (event_child), | |
2266 | event_child->collecting_fast_tracepoint); | |
2267 | ||
2268 | trace_event = 1; | |
2269 | ||
2270 | event_child->collecting_fast_tracepoint | |
2271 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2272 | ||
2273 | if (event_child->collecting_fast_tracepoint != 1) | |
2274 | { | |
2275 | /* No longer need this breakpoint. */ | |
2276 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2277 | { | |
2278 | if (debug_threads) | |
2279 | fprintf (stderr, | |
2280 | "No longer need exit-jump-pad bkpt; removing it." | |
2281 | "stopping all threads momentarily.\n"); | |
2282 | ||
2283 | /* Other running threads could hit this breakpoint. | |
2284 | We don't handle moribund locations like GDB does, | |
2285 | instead we always pause all threads when removing | |
2286 | breakpoints, so that any step-over or | |
2287 | decr_pc_after_break adjustment is always taken | |
2288 | care of while the breakpoint is still | |
2289 | inserted. */ | |
2290 | stop_all_lwps (1, event_child); | |
2291 | cancel_breakpoints (); | |
2292 | ||
2293 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2294 | event_child->exit_jump_pad_bkpt = NULL; | |
2295 | ||
2296 | unstop_all_lwps (1, event_child); | |
2297 | ||
2298 | gdb_assert (event_child->suspended >= 0); | |
2299 | } | |
2300 | } | |
2301 | ||
2302 | if (event_child->collecting_fast_tracepoint == 0) | |
2303 | { | |
2304 | if (debug_threads) | |
2305 | fprintf (stderr, | |
2306 | "fast tracepoint finished " | |
2307 | "collecting successfully.\n"); | |
2308 | ||
2309 | /* We may have a deferred signal to report. */ | |
2310 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2311 | { | |
2312 | if (debug_threads) | |
2313 | fprintf (stderr, "dequeued one signal.\n"); | |
2314 | } | |
3c11dd79 | 2315 | else |
fa593d66 | 2316 | { |
3c11dd79 PA |
2317 | if (debug_threads) |
2318 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2319 | |
2320 | if (stabilizing_threads) | |
2321 | { | |
2322 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
2323 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2324 | return ptid_of (event_child); | |
2325 | } | |
2326 | } | |
2327 | } | |
6bf5e0ba PA |
2328 | } |
2329 | ||
e471f25b PA |
2330 | /* Check whether GDB would be interested in this event. */ |
2331 | ||
2332 | /* If GDB is not interested in this signal, don't stop other | |
2333 | threads, and don't report it to GDB. Just resume the inferior | |
2334 | right away. We do this for threading-related signals as well as | |
2335 | any that GDB specifically requested we ignore. But never ignore | |
2336 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2337 | stepping - they may require special handling to skip the signal | |
2338 | handler. */ | |
2339 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2340 | thread library? */ | |
2341 | if (WIFSTOPPED (w) | |
2342 | && current_inferior->last_resume_kind != resume_step | |
2343 | && ( | |
1a981360 | 2344 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2345 | (current_process ()->private->thread_db != NULL |
2346 | && (WSTOPSIG (w) == __SIGRTMIN | |
2347 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2348 | || | |
2349 | #endif | |
2350 | (pass_signals[target_signal_from_host (WSTOPSIG (w))] | |
2351 | && !(WSTOPSIG (w) == SIGSTOP | |
2352 | && current_inferior->last_resume_kind == resume_stop)))) | |
2353 | { | |
2354 | siginfo_t info, *info_p; | |
2355 | ||
2356 | if (debug_threads) | |
2357 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2358 | WSTOPSIG (w), lwpid_of (event_child)); | |
2359 | ||
2360 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) | |
2361 | info_p = &info; | |
2362 | else | |
2363 | info_p = NULL; | |
2364 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2365 | WSTOPSIG (w), info_p); | |
2366 | goto retry; | |
2367 | } | |
2368 | ||
2369 | /* If GDB wanted this thread to single step, we always want to | |
2370 | report the SIGTRAP, and let GDB handle it. Watchpoints should | |
2371 | always be reported. So should signals we can't explain. A | |
2372 | SIGTRAP we can't explain could be a GDB breakpoint --- we may or | |
2373 | not support Z0 breakpoints. If we do, we're be able to handle | |
2374 | GDB breakpoints on top of internal breakpoints, by handling the | |
2375 | internal breakpoint and still reporting the event to GDB. If we | |
2376 | don't, we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 2377 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 2378 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 2379 | || event_child->stopped_by_watchpoint |
493e2a69 MS |
2380 | || (!step_over_finished |
2381 | && !bp_explains_trap && !trace_event) | |
8b07ae33 | 2382 | || gdb_breakpoint_here (event_child->stop_pc)); |
6bf5e0ba PA |
2383 | |
2384 | /* We found no reason GDB would want us to stop. We either hit one | |
2385 | of our own breakpoints, or finished an internal step GDB | |
2386 | shouldn't know about. */ | |
2387 | if (!report_to_gdb) | |
2388 | { | |
2389 | if (debug_threads) | |
2390 | { | |
2391 | if (bp_explains_trap) | |
2392 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2393 | if (step_over_finished) | |
2394 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2395 | if (trace_event) |
2396 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
2397 | } |
2398 | ||
2399 | /* We're not reporting this breakpoint to GDB, so apply the | |
2400 | decr_pc_after_break adjustment to the inferior's regcache | |
2401 | ourselves. */ | |
2402 | ||
2403 | if (the_low_target.set_pc != NULL) | |
2404 | { | |
2405 | struct regcache *regcache | |
2406 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2407 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2408 | } | |
2409 | ||
7984d532 PA |
2410 | /* We may have finished stepping over a breakpoint. If so, |
2411 | we've stopped and suspended all LWPs momentarily except the | |
2412 | stepping one. This is where we resume them all again. We're | |
2413 | going to keep waiting, so use proceed, which handles stepping | |
2414 | over the next breakpoint. */ | |
6bf5e0ba PA |
2415 | if (debug_threads) |
2416 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2417 | |
2418 | if (step_over_finished) | |
2419 | unsuspend_all_lwps (event_child); | |
2420 | ||
6bf5e0ba PA |
2421 | proceed_all_lwps (); |
2422 | goto retry; | |
2423 | } | |
2424 | ||
2425 | if (debug_threads) | |
2426 | { | |
8336d594 | 2427 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
2428 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
2429 | if (event_child->stopped_by_watchpoint) | |
2430 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2431 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2432 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2433 | if (debug_threads) |
2434 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2435 | } | |
2436 | ||
2437 | /* Alright, we're going to report a stop. */ | |
2438 | ||
fa593d66 | 2439 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2440 | { |
2441 | /* In all-stop, stop all threads. */ | |
7984d532 | 2442 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2443 | |
2444 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2445 | from among those that have had events. Giving equal priority | |
2446 | to all LWPs that have had events helps prevent | |
2447 | starvation. */ | |
2448 | if (ptid_equal (ptid, minus_one_ptid)) | |
2449 | { | |
2450 | event_child->status_pending_p = 1; | |
2451 | event_child->status_pending = w; | |
2452 | ||
2453 | select_event_lwp (&event_child); | |
2454 | ||
2455 | event_child->status_pending_p = 0; | |
2456 | w = event_child->status_pending; | |
2457 | } | |
2458 | ||
2459 | /* Now that we've selected our final event LWP, cancel any | |
2460 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2461 | See the comment in cancel_breakpoints_callback to find out | |
2462 | why. */ | |
2463 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 PA |
2464 | |
2465 | /* Stabilize threads (move out of jump pads). */ | |
2466 | stabilize_threads (); | |
6bf5e0ba PA |
2467 | } |
2468 | else | |
2469 | { | |
2470 | /* If we just finished a step-over, then all threads had been | |
2471 | momentarily paused. In all-stop, that's fine, we want | |
2472 | threads stopped by now anyway. In non-stop, we need to | |
2473 | re-resume threads that GDB wanted to be running. */ | |
2474 | if (step_over_finished) | |
7984d532 | 2475 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2476 | } |
2477 | ||
5b1c542e | 2478 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2479 | |
8336d594 PA |
2480 | if (current_inferior->last_resume_kind == resume_stop |
2481 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2482 | { |
2483 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2484 | and it stopped cleanly, so report as SIG0. The use of | |
2485 | SIGSTOP is an implementation detail. */ | |
2486 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
2487 | } | |
8336d594 PA |
2488 | else if (current_inferior->last_resume_kind == resume_stop |
2489 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2490 | { |
2491 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2492 | but, it stopped for other reasons. */ |
bd99dc85 PA |
2493 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
2494 | } | |
2495 | else | |
2496 | { | |
2497 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
2498 | } | |
2499 | ||
d50171e4 PA |
2500 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2501 | ||
bd99dc85 | 2502 | if (debug_threads) |
95954743 | 2503 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2504 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2505 | ourstatus->kind, |
2506 | ourstatus->value.sig); | |
2507 | ||
6bf5e0ba | 2508 | return ptid_of (event_child); |
bd99dc85 PA |
2509 | } |
2510 | ||
2511 | /* Get rid of any pending event in the pipe. */ | |
2512 | static void | |
2513 | async_file_flush (void) | |
2514 | { | |
2515 | int ret; | |
2516 | char buf; | |
2517 | ||
2518 | do | |
2519 | ret = read (linux_event_pipe[0], &buf, 1); | |
2520 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2521 | } | |
2522 | ||
2523 | /* Put something in the pipe, so the event loop wakes up. */ | |
2524 | static void | |
2525 | async_file_mark (void) | |
2526 | { | |
2527 | int ret; | |
2528 | ||
2529 | async_file_flush (); | |
2530 | ||
2531 | do | |
2532 | ret = write (linux_event_pipe[1], "+", 1); | |
2533 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2534 | ||
2535 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2536 | be awakened anyway. */ | |
2537 | } | |
2538 | ||
95954743 PA |
2539 | static ptid_t |
2540 | linux_wait (ptid_t ptid, | |
2541 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2542 | { |
95954743 | 2543 | ptid_t event_ptid; |
bd99dc85 PA |
2544 | |
2545 | if (debug_threads) | |
95954743 | 2546 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2547 | |
2548 | /* Flush the async file first. */ | |
2549 | if (target_is_async_p ()) | |
2550 | async_file_flush (); | |
2551 | ||
95954743 | 2552 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2553 | |
2554 | /* If at least one stop was reported, there may be more. A single | |
2555 | SIGCHLD can signal more than one child stop. */ | |
2556 | if (target_is_async_p () | |
2557 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2558 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2559 | async_file_mark (); |
2560 | ||
2561 | return event_ptid; | |
da6d8c04 DJ |
2562 | } |
2563 | ||
c5f62d5f | 2564 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2565 | |
2566 | static int | |
a1928bad | 2567 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2568 | { |
c5f62d5f DE |
2569 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2570 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2571 | |
c5f62d5f DE |
2572 | #ifdef __NR_tkill |
2573 | { | |
2574 | static int tkill_failed; | |
fd500816 | 2575 | |
c5f62d5f DE |
2576 | if (!tkill_failed) |
2577 | { | |
2578 | int ret; | |
2579 | ||
2580 | errno = 0; | |
2581 | ret = syscall (__NR_tkill, lwpid, signo); | |
2582 | if (errno != ENOSYS) | |
2583 | return ret; | |
2584 | tkill_failed = 1; | |
2585 | } | |
2586 | } | |
fd500816 DJ |
2587 | #endif |
2588 | ||
2589 | return kill (lwpid, signo); | |
2590 | } | |
2591 | ||
964e4306 PA |
2592 | void |
2593 | linux_stop_lwp (struct lwp_info *lwp) | |
2594 | { | |
2595 | send_sigstop (lwp); | |
2596 | } | |
2597 | ||
0d62e5e8 | 2598 | static void |
02fc4de7 | 2599 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2600 | { |
bd99dc85 | 2601 | int pid; |
0d62e5e8 | 2602 | |
bd99dc85 PA |
2603 | pid = lwpid_of (lwp); |
2604 | ||
0d62e5e8 DJ |
2605 | /* If we already have a pending stop signal for this process, don't |
2606 | send another. */ | |
54a0b537 | 2607 | if (lwp->stop_expected) |
0d62e5e8 | 2608 | { |
ae13219e | 2609 | if (debug_threads) |
bd99dc85 | 2610 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2611 | |
0d62e5e8 DJ |
2612 | return; |
2613 | } | |
2614 | ||
2615 | if (debug_threads) | |
bd99dc85 | 2616 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2617 | |
d50171e4 | 2618 | lwp->stop_expected = 1; |
bd99dc85 | 2619 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2620 | } |
2621 | ||
7984d532 PA |
2622 | static int |
2623 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2624 | { |
2625 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2626 | ||
7984d532 PA |
2627 | /* Ignore EXCEPT. */ |
2628 | if (lwp == except) | |
2629 | return 0; | |
2630 | ||
02fc4de7 | 2631 | if (lwp->stopped) |
7984d532 | 2632 | return 0; |
02fc4de7 PA |
2633 | |
2634 | send_sigstop (lwp); | |
7984d532 PA |
2635 | return 0; |
2636 | } | |
2637 | ||
2638 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2639 | yet. */ | |
2640 | static int | |
2641 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2642 | void *except) | |
2643 | { | |
2644 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2645 | ||
2646 | /* Ignore EXCEPT. */ | |
2647 | if (lwp == except) | |
2648 | return 0; | |
2649 | ||
2650 | lwp->suspended++; | |
2651 | ||
2652 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2653 | } |
2654 | ||
95954743 PA |
2655 | static void |
2656 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2657 | { | |
2658 | /* It's dead, really. */ | |
2659 | lwp->dead = 1; | |
2660 | ||
2661 | /* Store the exit status for later. */ | |
2662 | lwp->status_pending_p = 1; | |
2663 | lwp->status_pending = wstat; | |
2664 | ||
95954743 PA |
2665 | /* Prevent trying to stop it. */ |
2666 | lwp->stopped = 1; | |
2667 | ||
2668 | /* No further stops are expected from a dead lwp. */ | |
2669 | lwp->stop_expected = 0; | |
2670 | } | |
2671 | ||
0d62e5e8 DJ |
2672 | static void |
2673 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2674 | { | |
54a0b537 | 2675 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2676 | struct thread_info *saved_inferior; |
a1928bad | 2677 | int wstat; |
95954743 PA |
2678 | ptid_t saved_tid; |
2679 | ptid_t ptid; | |
d50171e4 | 2680 | int pid; |
0d62e5e8 | 2681 | |
54a0b537 | 2682 | if (lwp->stopped) |
d50171e4 PA |
2683 | { |
2684 | if (debug_threads) | |
2685 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2686 | lwpid_of (lwp)); | |
2687 | return; | |
2688 | } | |
0d62e5e8 DJ |
2689 | |
2690 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2691 | if (saved_inferior != NULL) |
2692 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2693 | else | |
95954743 | 2694 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2695 | |
95954743 | 2696 | ptid = lwp->head.id; |
bd99dc85 | 2697 | |
d50171e4 PA |
2698 | if (debug_threads) |
2699 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2700 | ||
2701 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2702 | |
2703 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2704 | and record the pending SIGSTOP. If the process exited, just | |
2705 | return. */ | |
d50171e4 | 2706 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2707 | { |
2708 | if (debug_threads) | |
d50171e4 PA |
2709 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2710 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2711 | |
d50171e4 | 2712 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2713 | { |
2714 | if (debug_threads) | |
d50171e4 PA |
2715 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2716 | lwpid_of (lwp), wstat); | |
2717 | ||
c35fafde PA |
2718 | lwp->status_pending_p = 1; |
2719 | lwp->status_pending = wstat; | |
2720 | } | |
0d62e5e8 | 2721 | } |
d50171e4 | 2722 | else |
95954743 PA |
2723 | { |
2724 | if (debug_threads) | |
d50171e4 | 2725 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2726 | |
d50171e4 PA |
2727 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2728 | if (lwp) | |
2729 | { | |
2730 | /* Leave this status pending for the next time we're able to | |
2731 | report it. In the mean time, we'll report this lwp as | |
2732 | dead to GDB, so GDB doesn't try to read registers and | |
2733 | memory from it. This can only happen if this was the | |
2734 | last thread of the process; otherwise, PID is removed | |
2735 | from the thread tables before linux_wait_for_event | |
2736 | returns. */ | |
2737 | mark_lwp_dead (lwp, wstat); | |
2738 | } | |
95954743 | 2739 | } |
0d62e5e8 | 2740 | |
bd99dc85 | 2741 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2742 | current_inferior = saved_inferior; |
2743 | else | |
2744 | { | |
2745 | if (debug_threads) | |
2746 | fprintf (stderr, "Previously current thread died.\n"); | |
2747 | ||
bd99dc85 PA |
2748 | if (non_stop) |
2749 | { | |
2750 | /* We can't change the current inferior behind GDB's back, | |
2751 | otherwise, a subsequent command may apply to the wrong | |
2752 | process. */ | |
2753 | current_inferior = NULL; | |
2754 | } | |
2755 | else | |
2756 | { | |
2757 | /* Set a valid thread as current. */ | |
2758 | set_desired_inferior (0); | |
2759 | } | |
0d62e5e8 DJ |
2760 | } |
2761 | } | |
2762 | ||
fa593d66 PA |
2763 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
2764 | move it out, because we need to report the stop event to GDB. For | |
2765 | example, if the user puts a breakpoint in the jump pad, it's | |
2766 | because she wants to debug it. */ | |
2767 | ||
2768 | static int | |
2769 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
2770 | { | |
2771 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2772 | struct thread_info *thread = get_lwp_thread (lwp); | |
2773 | ||
2774 | gdb_assert (lwp->suspended == 0); | |
2775 | gdb_assert (lwp->stopped); | |
2776 | ||
2777 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
2778 | return (supports_fast_tracepoints () | |
2779 | && in_process_agent_loaded () | |
2780 | && (gdb_breakpoint_here (lwp->stop_pc) | |
2781 | || lwp->stopped_by_watchpoint | |
2782 | || thread->last_resume_kind == resume_step) | |
2783 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
2784 | } | |
2785 | ||
2786 | static void | |
2787 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
2788 | { | |
2789 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2790 | struct thread_info *thread = get_lwp_thread (lwp); | |
2791 | int *wstat; | |
2792 | ||
2793 | gdb_assert (lwp->suspended == 0); | |
2794 | gdb_assert (lwp->stopped); | |
2795 | ||
2796 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
2797 | ||
2798 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
2799 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
2800 | && !lwp->stopped_by_watchpoint | |
2801 | && thread->last_resume_kind != resume_step | |
2802 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
2803 | { | |
2804 | if (debug_threads) | |
2805 | fprintf (stderr, | |
2806 | "LWP %ld needs stabilizing (in jump pad)\n", | |
2807 | lwpid_of (lwp)); | |
2808 | ||
2809 | if (wstat) | |
2810 | { | |
2811 | lwp->status_pending_p = 0; | |
2812 | enqueue_one_deferred_signal (lwp, wstat); | |
2813 | ||
2814 | if (debug_threads) | |
2815 | fprintf (stderr, | |
2816 | "Signal %d for LWP %ld deferred " | |
2817 | "(in jump pad)\n", | |
2818 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
2819 | } | |
2820 | ||
2821 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
2822 | } | |
2823 | else | |
2824 | lwp->suspended++; | |
2825 | } | |
2826 | ||
2827 | static int | |
2828 | lwp_running (struct inferior_list_entry *entry, void *data) | |
2829 | { | |
2830 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2831 | ||
2832 | if (lwp->dead) | |
2833 | return 0; | |
2834 | if (lwp->stopped) | |
2835 | return 0; | |
2836 | return 1; | |
2837 | } | |
2838 | ||
7984d532 PA |
2839 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
2840 | If SUSPEND, then also increase the suspend count of every LWP, | |
2841 | except EXCEPT. */ | |
2842 | ||
0d62e5e8 | 2843 | static void |
7984d532 | 2844 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 DJ |
2845 | { |
2846 | stopping_threads = 1; | |
7984d532 PA |
2847 | |
2848 | if (suspend) | |
2849 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
2850 | else | |
2851 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 2852 | for_each_inferior (&all_lwps, wait_for_sigstop); |
0d62e5e8 DJ |
2853 | stopping_threads = 0; |
2854 | } | |
2855 | ||
da6d8c04 DJ |
2856 | /* Resume execution of the inferior process. |
2857 | If STEP is nonzero, single-step it. | |
2858 | If SIGNAL is nonzero, give it that signal. */ | |
2859 | ||
ce3a066d | 2860 | static void |
2acc282a | 2861 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 2862 | int step, int signal, siginfo_t *info) |
da6d8c04 | 2863 | { |
0d62e5e8 | 2864 | struct thread_info *saved_inferior; |
fa593d66 | 2865 | int fast_tp_collecting; |
0d62e5e8 | 2866 | |
54a0b537 | 2867 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
2868 | return; |
2869 | ||
fa593d66 PA |
2870 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
2871 | ||
2872 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
2873 | ||
219f2f23 PA |
2874 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
2875 | user used the "jump" command, or "set $pc = foo"). */ | |
2876 | if (lwp->stop_pc != get_pc (lwp)) | |
2877 | { | |
2878 | /* Collecting 'while-stepping' actions doesn't make sense | |
2879 | anymore. */ | |
2880 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
2881 | } | |
2882 | ||
0d62e5e8 DJ |
2883 | /* If we have pending signals or status, and a new signal, enqueue the |
2884 | signal. Also enqueue the signal if we are waiting to reinsert a | |
2885 | breakpoint; it will be picked up again below. */ | |
2886 | if (signal != 0 | |
fa593d66 PA |
2887 | && (lwp->status_pending_p |
2888 | || lwp->pending_signals != NULL | |
2889 | || lwp->bp_reinsert != 0 | |
2890 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
2891 | { |
2892 | struct pending_signals *p_sig; | |
bca929d3 | 2893 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 2894 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 2895 | p_sig->signal = signal; |
32ca6d61 DJ |
2896 | if (info == NULL) |
2897 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2898 | else | |
2899 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 2900 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
2901 | } |
2902 | ||
d50171e4 PA |
2903 | if (lwp->status_pending_p) |
2904 | { | |
2905 | if (debug_threads) | |
2906 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
2907 | " has pending status\n", | |
2908 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
2909 | lwp->stop_expected ? "expected" : "not expected"); | |
2910 | return; | |
2911 | } | |
0d62e5e8 DJ |
2912 | |
2913 | saved_inferior = current_inferior; | |
54a0b537 | 2914 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
2915 | |
2916 | if (debug_threads) | |
1b3f6016 | 2917 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 2918 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 2919 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
2920 | |
2921 | /* This bit needs some thinking about. If we get a signal that | |
2922 | we must report while a single-step reinsert is still pending, | |
2923 | we often end up resuming the thread. It might be better to | |
2924 | (ew) allow a stack of pending events; then we could be sure that | |
2925 | the reinsert happened right away and not lose any signals. | |
2926 | ||
2927 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 2928 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
2929 | complete correctness, so it won't solve that problem. It may be |
2930 | worthwhile just to solve this one, however. */ | |
54a0b537 | 2931 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
2932 | { |
2933 | if (debug_threads) | |
d50171e4 PA |
2934 | fprintf (stderr, " pending reinsert at 0x%s\n", |
2935 | paddress (lwp->bp_reinsert)); | |
2936 | ||
2937 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
2938 | { | |
fa593d66 PA |
2939 | if (fast_tp_collecting == 0) |
2940 | { | |
2941 | if (step == 0) | |
2942 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
2943 | if (lwp->suspended) | |
2944 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
2945 | lwp->suspended); | |
2946 | } | |
d50171e4 PA |
2947 | |
2948 | step = 1; | |
2949 | } | |
0d62e5e8 DJ |
2950 | |
2951 | /* Postpone any pending signal. It was enqueued above. */ | |
2952 | signal = 0; | |
2953 | } | |
2954 | ||
fa593d66 PA |
2955 | if (fast_tp_collecting == 1) |
2956 | { | |
2957 | if (debug_threads) | |
2958 | fprintf (stderr, "\ | |
2959 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
2960 | lwpid_of (lwp)); | |
2961 | ||
2962 | /* Postpone any pending signal. It was enqueued above. */ | |
2963 | signal = 0; | |
2964 | } | |
2965 | else if (fast_tp_collecting == 2) | |
2966 | { | |
2967 | if (debug_threads) | |
2968 | fprintf (stderr, "\ | |
2969 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
2970 | lwpid_of (lwp)); | |
2971 | ||
2972 | if (can_hardware_single_step ()) | |
2973 | step = 1; | |
2974 | else | |
2975 | fatal ("moving out of jump pad single-stepping" | |
2976 | " not implemented on this target"); | |
2977 | ||
2978 | /* Postpone any pending signal. It was enqueued above. */ | |
2979 | signal = 0; | |
2980 | } | |
2981 | ||
219f2f23 PA |
2982 | /* If we have while-stepping actions in this thread set it stepping. |
2983 | If we have a signal to deliver, it may or may not be set to | |
2984 | SIG_IGN, we don't know. Assume so, and allow collecting | |
2985 | while-stepping into a signal handler. A possible smart thing to | |
2986 | do would be to set an internal breakpoint at the signal return | |
2987 | address, continue, and carry on catching this while-stepping | |
2988 | action only when that breakpoint is hit. A future | |
2989 | enhancement. */ | |
2990 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
2991 | && can_hardware_single_step ()) | |
2992 | { | |
2993 | if (debug_threads) | |
2994 | fprintf (stderr, | |
2995 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
2996 | lwpid_of (lwp)); | |
2997 | step = 1; | |
2998 | } | |
2999 | ||
aa691b87 | 3000 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3001 | { |
442ea881 PA |
3002 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3003 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 3004 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3005 | } |
3006 | ||
fa593d66 PA |
3007 | /* If we have pending signals, consume one unless we are trying to |
3008 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3009 | collect. */ | |
3010 | if (lwp->pending_signals != NULL | |
3011 | && lwp->bp_reinsert == 0 | |
3012 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3013 | { |
3014 | struct pending_signals **p_sig; | |
3015 | ||
54a0b537 | 3016 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3017 | while ((*p_sig)->prev != NULL) |
3018 | p_sig = &(*p_sig)->prev; | |
3019 | ||
3020 | signal = (*p_sig)->signal; | |
32ca6d61 | 3021 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 3022 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 3023 | |
0d62e5e8 DJ |
3024 | free (*p_sig); |
3025 | *p_sig = NULL; | |
3026 | } | |
3027 | ||
aa5ca48f DE |
3028 | if (the_low_target.prepare_to_resume != NULL) |
3029 | the_low_target.prepare_to_resume (lwp); | |
3030 | ||
0d62e5e8 | 3031 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 3032 | get_lwp_thread (lwp)); |
da6d8c04 | 3033 | errno = 0; |
54a0b537 | 3034 | lwp->stopped = 0; |
c3adc08c | 3035 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3036 | lwp->stepping = step; |
14ce3065 DE |
3037 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
3038 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3039 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3040 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
3041 | |
3042 | current_inferior = saved_inferior; | |
da6d8c04 | 3043 | if (errno) |
3221518c UW |
3044 | { |
3045 | /* ESRCH from ptrace either means that the thread was already | |
3046 | running (an error) or that it is gone (a race condition). If | |
3047 | it's gone, we will get a notification the next time we wait, | |
3048 | so we can ignore the error. We could differentiate these | |
3049 | two, but it's tricky without waiting; the thread still exists | |
3050 | as a zombie, so sending it signal 0 would succeed. So just | |
3051 | ignore ESRCH. */ | |
3052 | if (errno == ESRCH) | |
3053 | return; | |
3054 | ||
3055 | perror_with_name ("ptrace"); | |
3056 | } | |
da6d8c04 DJ |
3057 | } |
3058 | ||
2bd7c093 PA |
3059 | struct thread_resume_array |
3060 | { | |
3061 | struct thread_resume *resume; | |
3062 | size_t n; | |
3063 | }; | |
64386c31 DJ |
3064 | |
3065 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
3066 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
3067 | resume request. | |
3068 | ||
3069 | This algorithm is O(threads * resume elements), but resume elements | |
3070 | is small (and will remain small at least until GDB supports thread | |
3071 | suspension). */ | |
2bd7c093 PA |
3072 | static int |
3073 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3074 | { |
54a0b537 | 3075 | struct lwp_info *lwp; |
64386c31 | 3076 | struct thread_info *thread; |
5544ad89 | 3077 | int ndx; |
2bd7c093 | 3078 | struct thread_resume_array *r; |
64386c31 DJ |
3079 | |
3080 | thread = (struct thread_info *) entry; | |
54a0b537 | 3081 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3082 | r = arg; |
64386c31 | 3083 | |
2bd7c093 | 3084 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3085 | { |
3086 | ptid_t ptid = r->resume[ndx].thread; | |
3087 | if (ptid_equal (ptid, minus_one_ptid) | |
3088 | || ptid_equal (ptid, entry->id) | |
3089 | || (ptid_is_pid (ptid) | |
3090 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
3091 | || (ptid_get_lwp (ptid) == -1 | |
3092 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
3093 | { | |
d50171e4 | 3094 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3095 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3096 | { |
3097 | if (debug_threads) | |
3098 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3099 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3100 | ? "stopped" | |
3101 | : "stopping", | |
3102 | lwpid_of (lwp)); | |
3103 | ||
3104 | continue; | |
3105 | } | |
3106 | ||
95954743 | 3107 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3108 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 PA |
3109 | |
3110 | /* If we had a deferred signal to report, dequeue one now. | |
3111 | This can happen if LWP gets more than one signal while | |
3112 | trying to get out of a jump pad. */ | |
3113 | if (lwp->stopped | |
3114 | && !lwp->status_pending_p | |
3115 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3116 | { | |
3117 | lwp->status_pending_p = 1; | |
3118 | ||
3119 | if (debug_threads) | |
3120 | fprintf (stderr, | |
3121 | "Dequeueing deferred signal %d for LWP %ld, " | |
3122 | "leaving status pending.\n", | |
3123 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3124 | } | |
3125 | ||
95954743 PA |
3126 | return 0; |
3127 | } | |
3128 | } | |
2bd7c093 PA |
3129 | |
3130 | /* No resume action for this thread. */ | |
3131 | lwp->resume = NULL; | |
64386c31 | 3132 | |
2bd7c093 | 3133 | return 0; |
5544ad89 DJ |
3134 | } |
3135 | ||
5544ad89 | 3136 | |
bd99dc85 PA |
3137 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3138 | static int | |
3139 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3140 | { |
bd99dc85 | 3141 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3142 | |
bd99dc85 PA |
3143 | /* LWPs which will not be resumed are not interesting, because |
3144 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3145 | if (lwp->resume == NULL) |
bd99dc85 | 3146 | return 0; |
64386c31 | 3147 | |
bd99dc85 | 3148 | if (lwp->status_pending_p) |
d50171e4 PA |
3149 | * (int *) flag_p = 1; |
3150 | ||
3151 | return 0; | |
3152 | } | |
3153 | ||
3154 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3155 | internal breakpoint that we need to step over. It assumes that any | |
3156 | required STOP_PC adjustment has already been propagated to the | |
3157 | inferior's regcache. */ | |
3158 | ||
3159 | static int | |
3160 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3161 | { | |
3162 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3163 | struct thread_info *thread; |
d50171e4 PA |
3164 | struct thread_info *saved_inferior; |
3165 | CORE_ADDR pc; | |
3166 | ||
3167 | /* LWPs which will not be resumed are not interesting, because we | |
3168 | might not wait for them next time through linux_wait. */ | |
3169 | ||
3170 | if (!lwp->stopped) | |
3171 | { | |
3172 | if (debug_threads) | |
3173 | fprintf (stderr, | |
3174 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3175 | lwpid_of (lwp)); | |
3176 | return 0; | |
3177 | } | |
3178 | ||
8336d594 PA |
3179 | thread = get_lwp_thread (lwp); |
3180 | ||
3181 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3182 | { |
3183 | if (debug_threads) | |
3184 | fprintf (stderr, | |
3185 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3186 | lwpid_of (lwp)); | |
3187 | return 0; | |
3188 | } | |
3189 | ||
7984d532 PA |
3190 | gdb_assert (lwp->suspended >= 0); |
3191 | ||
3192 | if (lwp->suspended) | |
3193 | { | |
3194 | if (debug_threads) | |
3195 | fprintf (stderr, | |
3196 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3197 | lwpid_of (lwp)); | |
3198 | return 0; | |
3199 | } | |
3200 | ||
d50171e4 PA |
3201 | if (!lwp->need_step_over) |
3202 | { | |
3203 | if (debug_threads) | |
3204 | fprintf (stderr, | |
3205 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3206 | } | |
5544ad89 | 3207 | |
bd99dc85 | 3208 | if (lwp->status_pending_p) |
d50171e4 PA |
3209 | { |
3210 | if (debug_threads) | |
3211 | fprintf (stderr, | |
3212 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3213 | lwpid_of (lwp)); | |
3214 | return 0; | |
3215 | } | |
3216 | ||
3217 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3218 | or we have. */ | |
3219 | pc = get_pc (lwp); | |
3220 | ||
3221 | /* If the PC has changed since we stopped, then don't do anything, | |
3222 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3223 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3224 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3225 | command, or poked thread's registers herself. */ | |
3226 | if (pc != lwp->stop_pc) | |
3227 | { | |
3228 | if (debug_threads) | |
3229 | fprintf (stderr, | |
3230 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3231 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3232 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3233 | ||
3234 | lwp->need_step_over = 0; | |
3235 | return 0; | |
3236 | } | |
3237 | ||
3238 | saved_inferior = current_inferior; | |
8336d594 | 3239 | current_inferior = thread; |
d50171e4 | 3240 | |
8b07ae33 | 3241 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3242 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3243 | { |
8b07ae33 PA |
3244 | /* Don't step over a breakpoint that GDB expects to hit |
3245 | though. */ | |
3246 | if (gdb_breakpoint_here (pc)) | |
3247 | { | |
3248 | if (debug_threads) | |
3249 | fprintf (stderr, | |
3250 | "Need step over [LWP %ld]? yes, but found" | |
3251 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3252 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3253 | |
8b07ae33 PA |
3254 | current_inferior = saved_inferior; |
3255 | return 0; | |
3256 | } | |
3257 | else | |
3258 | { | |
3259 | if (debug_threads) | |
3260 | fprintf (stderr, | |
493e2a69 MS |
3261 | "Need step over [LWP %ld]? yes, " |
3262 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3263 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3264 | |
8b07ae33 PA |
3265 | /* We've found an lwp that needs stepping over --- return 1 so |
3266 | that find_inferior stops looking. */ | |
3267 | current_inferior = saved_inferior; | |
3268 | ||
3269 | /* If the step over is cancelled, this is set again. */ | |
3270 | lwp->need_step_over = 0; | |
3271 | return 1; | |
3272 | } | |
d50171e4 PA |
3273 | } |
3274 | ||
3275 | current_inferior = saved_inferior; | |
3276 | ||
3277 | if (debug_threads) | |
3278 | fprintf (stderr, | |
3279 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3280 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3281 | |
bd99dc85 | 3282 | return 0; |
5544ad89 DJ |
3283 | } |
3284 | ||
d50171e4 PA |
3285 | /* Start a step-over operation on LWP. When LWP stopped at a |
3286 | breakpoint, to make progress, we need to remove the breakpoint out | |
3287 | of the way. If we let other threads run while we do that, they may | |
3288 | pass by the breakpoint location and miss hitting it. To avoid | |
3289 | that, a step-over momentarily stops all threads while LWP is | |
3290 | single-stepped while the breakpoint is temporarily uninserted from | |
3291 | the inferior. When the single-step finishes, we reinsert the | |
3292 | breakpoint, and let all threads that are supposed to be running, | |
3293 | run again. | |
3294 | ||
3295 | On targets that don't support hardware single-step, we don't | |
3296 | currently support full software single-stepping. Instead, we only | |
3297 | support stepping over the thread event breakpoint, by asking the | |
3298 | low target where to place a reinsert breakpoint. Since this | |
3299 | routine assumes the breakpoint being stepped over is a thread event | |
3300 | breakpoint, it usually assumes the return address of the current | |
3301 | function is a good enough place to set the reinsert breakpoint. */ | |
3302 | ||
3303 | static int | |
3304 | start_step_over (struct lwp_info *lwp) | |
3305 | { | |
3306 | struct thread_info *saved_inferior; | |
3307 | CORE_ADDR pc; | |
3308 | int step; | |
3309 | ||
3310 | if (debug_threads) | |
3311 | fprintf (stderr, | |
3312 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3313 | lwpid_of (lwp)); | |
3314 | ||
7984d532 PA |
3315 | stop_all_lwps (1, lwp); |
3316 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3317 | |
3318 | if (debug_threads) | |
3319 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3320 | ||
3321 | /* Note, we should always reach here with an already adjusted PC, | |
3322 | either by GDB (if we're resuming due to GDB's request), or by our | |
3323 | caller, if we just finished handling an internal breakpoint GDB | |
3324 | shouldn't care about. */ | |
3325 | pc = get_pc (lwp); | |
3326 | ||
3327 | saved_inferior = current_inferior; | |
3328 | current_inferior = get_lwp_thread (lwp); | |
3329 | ||
3330 | lwp->bp_reinsert = pc; | |
3331 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3332 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3333 | |
3334 | if (can_hardware_single_step ()) | |
3335 | { | |
3336 | step = 1; | |
3337 | } | |
3338 | else | |
3339 | { | |
3340 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3341 | set_reinsert_breakpoint (raddr); | |
3342 | step = 0; | |
3343 | } | |
3344 | ||
3345 | current_inferior = saved_inferior; | |
3346 | ||
3347 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3348 | ||
3349 | /* Require next event from this LWP. */ | |
3350 | step_over_bkpt = lwp->head.id; | |
3351 | return 1; | |
3352 | } | |
3353 | ||
3354 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3355 | start_step_over, if still there, and delete any reinsert | |
3356 | breakpoints we've set, on non hardware single-step targets. */ | |
3357 | ||
3358 | static int | |
3359 | finish_step_over (struct lwp_info *lwp) | |
3360 | { | |
3361 | if (lwp->bp_reinsert != 0) | |
3362 | { | |
3363 | if (debug_threads) | |
3364 | fprintf (stderr, "Finished step over.\n"); | |
3365 | ||
3366 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3367 | may be no breakpoint to reinsert there by now. */ | |
3368 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3369 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3370 | |
3371 | lwp->bp_reinsert = 0; | |
3372 | ||
3373 | /* Delete any software-single-step reinsert breakpoints. No | |
3374 | longer needed. We don't have to worry about other threads | |
3375 | hitting this trap, and later not being able to explain it, | |
3376 | because we were stepping over a breakpoint, and we hold all | |
3377 | threads but LWP stopped while doing that. */ | |
3378 | if (!can_hardware_single_step ()) | |
3379 | delete_reinsert_breakpoints (); | |
3380 | ||
3381 | step_over_bkpt = null_ptid; | |
3382 | return 1; | |
3383 | } | |
3384 | else | |
3385 | return 0; | |
3386 | } | |
3387 | ||
5544ad89 DJ |
3388 | /* This function is called once per thread. We check the thread's resume |
3389 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3390 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3391 | |
bd99dc85 PA |
3392 | For threads which we aren't explicitly told otherwise, we preserve |
3393 | the stepping flag; this is used for stepping over gdbserver-placed | |
3394 | breakpoints. | |
3395 | ||
3396 | If pending_flags was set in any thread, we queue any needed | |
3397 | signals, since we won't actually resume. We already have a pending | |
3398 | event to report, so we don't need to preserve any step requests; | |
3399 | they should be re-issued if necessary. */ | |
3400 | ||
3401 | static int | |
3402 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3403 | { |
54a0b537 | 3404 | struct lwp_info *lwp; |
5544ad89 | 3405 | struct thread_info *thread; |
bd99dc85 | 3406 | int step; |
d50171e4 PA |
3407 | int leave_all_stopped = * (int *) arg; |
3408 | int leave_pending; | |
5544ad89 DJ |
3409 | |
3410 | thread = (struct thread_info *) entry; | |
54a0b537 | 3411 | lwp = get_thread_lwp (thread); |
5544ad89 | 3412 | |
2bd7c093 | 3413 | if (lwp->resume == NULL) |
bd99dc85 | 3414 | return 0; |
5544ad89 | 3415 | |
bd99dc85 | 3416 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3417 | { |
bd99dc85 | 3418 | if (debug_threads) |
d50171e4 | 3419 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3420 | |
3421 | if (!lwp->stopped) | |
3422 | { | |
3423 | if (debug_threads) | |
d50171e4 | 3424 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3425 | |
d50171e4 PA |
3426 | /* Stop the thread, and wait for the event asynchronously, |
3427 | through the event loop. */ | |
02fc4de7 | 3428 | send_sigstop (lwp); |
bd99dc85 PA |
3429 | } |
3430 | else | |
3431 | { | |
3432 | if (debug_threads) | |
d50171e4 PA |
3433 | fprintf (stderr, "already stopped LWP %ld\n", |
3434 | lwpid_of (lwp)); | |
3435 | ||
3436 | /* The LWP may have been stopped in an internal event that | |
3437 | was not meant to be notified back to GDB (e.g., gdbserver | |
3438 | breakpoint), so we should be reporting a stop event in | |
3439 | this case too. */ | |
3440 | ||
3441 | /* If the thread already has a pending SIGSTOP, this is a | |
3442 | no-op. Otherwise, something later will presumably resume | |
3443 | the thread and this will cause it to cancel any pending | |
3444 | operation, due to last_resume_kind == resume_stop. If | |
3445 | the thread already has a pending status to report, we | |
3446 | will still report it the next time we wait - see | |
3447 | status_pending_p_callback. */ | |
1a981360 PA |
3448 | |
3449 | /* If we already have a pending signal to report, then | |
3450 | there's no need to queue a SIGSTOP, as this means we're | |
3451 | midway through moving the LWP out of the jumppad, and we | |
3452 | will report the pending signal as soon as that is | |
3453 | finished. */ | |
3454 | if (lwp->pending_signals_to_report == NULL) | |
3455 | send_sigstop (lwp); | |
bd99dc85 | 3456 | } |
32ca6d61 | 3457 | |
bd99dc85 PA |
3458 | /* For stop requests, we're done. */ |
3459 | lwp->resume = NULL; | |
fc7238bb | 3460 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3461 | return 0; |
5544ad89 DJ |
3462 | } |
3463 | ||
bd99dc85 PA |
3464 | /* If this thread which is about to be resumed has a pending status, |
3465 | then don't resume any threads - we can just report the pending | |
3466 | status. Make sure to queue any signals that would otherwise be | |
3467 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3468 | thread has a pending status. If there's a thread that needs the |
3469 | step-over-breakpoint dance, then don't resume any other thread | |
3470 | but that particular one. */ | |
3471 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3472 | |
d50171e4 | 3473 | if (!leave_pending) |
bd99dc85 PA |
3474 | { |
3475 | if (debug_threads) | |
3476 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3477 | |
d50171e4 | 3478 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3479 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3480 | } |
3481 | else | |
3482 | { | |
3483 | if (debug_threads) | |
3484 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3485 | |
bd99dc85 PA |
3486 | /* If we have a new signal, enqueue the signal. */ |
3487 | if (lwp->resume->sig != 0) | |
3488 | { | |
3489 | struct pending_signals *p_sig; | |
3490 | p_sig = xmalloc (sizeof (*p_sig)); | |
3491 | p_sig->prev = lwp->pending_signals; | |
3492 | p_sig->signal = lwp->resume->sig; | |
3493 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3494 | ||
3495 | /* If this is the same signal we were previously stopped by, | |
3496 | make sure to queue its siginfo. We can ignore the return | |
3497 | value of ptrace; if it fails, we'll skip | |
3498 | PTRACE_SETSIGINFO. */ | |
3499 | if (WIFSTOPPED (lwp->last_status) | |
3500 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
3501 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
3502 | ||
3503 | lwp->pending_signals = p_sig; | |
3504 | } | |
3505 | } | |
5544ad89 | 3506 | |
fc7238bb | 3507 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3508 | lwp->resume = NULL; |
5544ad89 | 3509 | return 0; |
0d62e5e8 DJ |
3510 | } |
3511 | ||
3512 | static void | |
2bd7c093 | 3513 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3514 | { |
2bd7c093 | 3515 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3516 | struct lwp_info *need_step_over = NULL; |
3517 | int any_pending; | |
3518 | int leave_all_stopped; | |
c6ecbae5 | 3519 | |
2bd7c093 | 3520 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3521 | |
d50171e4 PA |
3522 | /* If there is a thread which would otherwise be resumed, which has |
3523 | a pending status, then don't resume any threads - we can just | |
3524 | report the pending status. Make sure to queue any signals that | |
3525 | would otherwise be sent. In non-stop mode, we'll apply this | |
3526 | logic to each thread individually. We consume all pending events | |
3527 | before considering to start a step-over (in all-stop). */ | |
3528 | any_pending = 0; | |
bd99dc85 | 3529 | if (!non_stop) |
d50171e4 PA |
3530 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3531 | ||
3532 | /* If there is a thread which would otherwise be resumed, which is | |
3533 | stopped at a breakpoint that needs stepping over, then don't | |
3534 | resume any threads - have it step over the breakpoint with all | |
3535 | other threads stopped, then resume all threads again. Make sure | |
3536 | to queue any signals that would otherwise be delivered or | |
3537 | queued. */ | |
3538 | if (!any_pending && supports_breakpoints ()) | |
3539 | need_step_over | |
3540 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3541 | need_step_over_p, NULL); | |
3542 | ||
3543 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3544 | ||
3545 | if (debug_threads) | |
3546 | { | |
3547 | if (need_step_over != NULL) | |
3548 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3549 | else if (any_pending) | |
3550 | fprintf (stderr, | |
3551 | "Not resuming, all-stop and found " | |
3552 | "an LWP with pending status\n"); | |
3553 | else | |
3554 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3555 | } | |
3556 | ||
3557 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3558 | otherwise deliver. */ | |
3559 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3560 | ||
3561 | if (need_step_over) | |
3562 | start_step_over (need_step_over); | |
3563 | } | |
3564 | ||
3565 | /* This function is called once per thread. We check the thread's | |
3566 | last resume request, which will tell us whether to resume, step, or | |
3567 | leave the thread stopped. Any signal the client requested to be | |
3568 | delivered has already been enqueued at this point. | |
3569 | ||
3570 | If any thread that GDB wants running is stopped at an internal | |
3571 | breakpoint that needs stepping over, we start a step-over operation | |
3572 | on that particular thread, and leave all others stopped. */ | |
3573 | ||
7984d532 PA |
3574 | static int |
3575 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3576 | { |
7984d532 | 3577 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3578 | struct thread_info *thread; |
d50171e4 PA |
3579 | int step; |
3580 | ||
7984d532 PA |
3581 | if (lwp == except) |
3582 | return 0; | |
d50171e4 PA |
3583 | |
3584 | if (debug_threads) | |
3585 | fprintf (stderr, | |
3586 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3587 | ||
3588 | if (!lwp->stopped) | |
3589 | { | |
3590 | if (debug_threads) | |
3591 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3592 | return 0; |
d50171e4 PA |
3593 | } |
3594 | ||
8336d594 PA |
3595 | thread = get_lwp_thread (lwp); |
3596 | ||
02fc4de7 PA |
3597 | if (thread->last_resume_kind == resume_stop |
3598 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3599 | { |
3600 | if (debug_threads) | |
02fc4de7 PA |
3601 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3602 | lwpid_of (lwp)); | |
7984d532 | 3603 | return 0; |
d50171e4 PA |
3604 | } |
3605 | ||
3606 | if (lwp->status_pending_p) | |
3607 | { | |
3608 | if (debug_threads) | |
3609 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3610 | lwpid_of (lwp)); | |
7984d532 | 3611 | return 0; |
d50171e4 PA |
3612 | } |
3613 | ||
7984d532 PA |
3614 | gdb_assert (lwp->suspended >= 0); |
3615 | ||
d50171e4 PA |
3616 | if (lwp->suspended) |
3617 | { | |
3618 | if (debug_threads) | |
3619 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3620 | return 0; |
d50171e4 PA |
3621 | } |
3622 | ||
1a981360 PA |
3623 | if (thread->last_resume_kind == resume_stop |
3624 | && lwp->pending_signals_to_report == NULL | |
3625 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3626 | { |
3627 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3628 | last_status.kind check above would catch it, and we wouldn't | |
3629 | reach here. This LWP may have been momentarily paused by a | |
3630 | stop_all_lwps call while handling for example, another LWP's | |
3631 | step-over. In that case, the pending expected SIGSTOP signal | |
3632 | that was queued at vCont;t handling time will have already | |
3633 | been consumed by wait_for_sigstop, and so we need to requeue | |
3634 | another one here. Note that if the LWP already has a SIGSTOP | |
3635 | pending, this is a no-op. */ | |
3636 | ||
3637 | if (debug_threads) | |
3638 | fprintf (stderr, | |
3639 | "Client wants LWP %ld to stop. " | |
3640 | "Making sure it has a SIGSTOP pending\n", | |
3641 | lwpid_of (lwp)); | |
3642 | ||
3643 | send_sigstop (lwp); | |
3644 | } | |
3645 | ||
8336d594 | 3646 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3647 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3648 | return 0; |
3649 | } | |
3650 | ||
3651 | static int | |
3652 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3653 | { | |
3654 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3655 | ||
3656 | if (lwp == except) | |
3657 | return 0; | |
3658 | ||
3659 | lwp->suspended--; | |
3660 | gdb_assert (lwp->suspended >= 0); | |
3661 | ||
3662 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3663 | } |
3664 | ||
3665 | /* When we finish a step-over, set threads running again. If there's | |
3666 | another thread that may need a step-over, now's the time to start | |
3667 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3668 | ||
3669 | static void | |
3670 | proceed_all_lwps (void) | |
3671 | { | |
3672 | struct lwp_info *need_step_over; | |
3673 | ||
3674 | /* If there is a thread which would otherwise be resumed, which is | |
3675 | stopped at a breakpoint that needs stepping over, then don't | |
3676 | resume any threads - have it step over the breakpoint with all | |
3677 | other threads stopped, then resume all threads again. */ | |
3678 | ||
3679 | if (supports_breakpoints ()) | |
3680 | { | |
3681 | need_step_over | |
3682 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3683 | need_step_over_p, NULL); | |
3684 | ||
3685 | if (need_step_over != NULL) | |
3686 | { | |
3687 | if (debug_threads) | |
3688 | fprintf (stderr, "proceed_all_lwps: found " | |
3689 | "thread %ld needing a step-over\n", | |
3690 | lwpid_of (need_step_over)); | |
3691 | ||
3692 | start_step_over (need_step_over); | |
3693 | return; | |
3694 | } | |
3695 | } | |
5544ad89 | 3696 | |
d50171e4 PA |
3697 | if (debug_threads) |
3698 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3699 | ||
7984d532 | 3700 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3701 | } |
3702 | ||
3703 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3704 | pending statuses, are set to run again, except for EXCEPT, if not | |
3705 | NULL. This undoes a stop_all_lwps call. */ | |
3706 | ||
3707 | static void | |
7984d532 | 3708 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3709 | { |
5544ad89 DJ |
3710 | if (debug_threads) |
3711 | { | |
d50171e4 PA |
3712 | if (except) |
3713 | fprintf (stderr, | |
3714 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3715 | else |
d50171e4 PA |
3716 | fprintf (stderr, |
3717 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3718 | } |
3719 | ||
7984d532 PA |
3720 | if (unsuspend) |
3721 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3722 | else | |
3723 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3724 | } |
3725 | ||
3726 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
3727 | |
3728 | int | |
0a30fbc4 | 3729 | register_addr (int regnum) |
da6d8c04 DJ |
3730 | { |
3731 | int addr; | |
3732 | ||
2ec06d2e | 3733 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
3734 | error ("Invalid register number %d.", regnum); |
3735 | ||
2ec06d2e | 3736 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
3737 | |
3738 | return addr; | |
3739 | } | |
3740 | ||
58caa3dc | 3741 | /* Fetch one register. */ |
da6d8c04 | 3742 | static void |
442ea881 | 3743 | fetch_register (struct regcache *regcache, int regno) |
da6d8c04 DJ |
3744 | { |
3745 | CORE_ADDR regaddr; | |
48d93c75 | 3746 | int i, size; |
0d62e5e8 | 3747 | char *buf; |
95954743 | 3748 | int pid; |
da6d8c04 | 3749 | |
2ec06d2e | 3750 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 3751 | return; |
2ec06d2e | 3752 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 3753 | return; |
da6d8c04 | 3754 | |
0a30fbc4 DJ |
3755 | regaddr = register_addr (regno); |
3756 | if (regaddr == -1) | |
3757 | return; | |
95954743 | 3758 | |
1b3f6016 | 3759 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
50275556 | 3760 | & -sizeof (PTRACE_XFER_TYPE)); |
48d93c75 | 3761 | buf = alloca (size); |
50275556 MR |
3762 | |
3763 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
48d93c75 | 3764 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 DJ |
3765 | { |
3766 | errno = 0; | |
0d62e5e8 | 3767 | *(PTRACE_XFER_TYPE *) (buf + i) = |
14ce3065 DE |
3768 | ptrace (PTRACE_PEEKUSER, pid, |
3769 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3770 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3771 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
da6d8c04 DJ |
3772 | regaddr += sizeof (PTRACE_XFER_TYPE); |
3773 | if (errno != 0) | |
f52cd8cd | 3774 | error ("reading register %d: %s", regno, strerror (errno)); |
da6d8c04 | 3775 | } |
ee1a7ae4 UW |
3776 | |
3777 | if (the_low_target.supply_ptrace_register) | |
442ea881 | 3778 | the_low_target.supply_ptrace_register (regcache, regno, buf); |
5a1f5858 | 3779 | else |
442ea881 | 3780 | supply_register (regcache, regno, buf); |
da6d8c04 DJ |
3781 | } |
3782 | ||
7325beb4 MR |
3783 | /* Store one register. */ |
3784 | static void | |
3785 | store_register (struct regcache *regcache, int regno) | |
3786 | { | |
3787 | CORE_ADDR regaddr; | |
3788 | int i, size; | |
3789 | char *buf; | |
3790 | int pid; | |
3791 | ||
3792 | if (regno >= the_low_target.num_regs) | |
3793 | return; | |
50275556 | 3794 | if ((*the_low_target.cannot_store_register) (regno)) |
7325beb4 MR |
3795 | return; |
3796 | ||
3797 | regaddr = register_addr (regno); | |
3798 | if (regaddr == -1) | |
3799 | return; | |
50275556 MR |
3800 | |
3801 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) | |
3802 | & -sizeof (PTRACE_XFER_TYPE)); | |
7325beb4 MR |
3803 | buf = alloca (size); |
3804 | memset (buf, 0, size); | |
3805 | ||
3806 | if (the_low_target.collect_ptrace_register) | |
3807 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
3808 | else | |
3809 | collect_register (regcache, regno, buf); | |
3810 | ||
3811 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
3812 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
3813 | { | |
3814 | errno = 0; | |
3815 | ptrace (PTRACE_POKEUSER, pid, | |
3816 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3817 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3818 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
3819 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
3820 | if (errno != 0) | |
3821 | { | |
3822 | /* At this point, ESRCH should mean the process is | |
3823 | already gone, in which case we simply ignore attempts | |
3824 | to change its registers. See also the related | |
3825 | comment in linux_resume_one_lwp. */ | |
3826 | if (errno == ESRCH) | |
3827 | return; | |
3828 | ||
3829 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
3830 | error ("writing register %d: %s", regno, strerror (errno)); | |
3831 | } | |
3832 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
3833 | } | |
3834 | } | |
3835 | ||
da6d8c04 | 3836 | /* Fetch all registers, or just one, from the child process. */ |
58caa3dc | 3837 | static void |
442ea881 | 3838 | usr_fetch_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 3839 | { |
4463ce24 | 3840 | if (regno == -1) |
2ec06d2e | 3841 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 3842 | fetch_register (regcache, regno); |
da6d8c04 | 3843 | else |
442ea881 | 3844 | fetch_register (regcache, regno); |
da6d8c04 DJ |
3845 | } |
3846 | ||
3847 | /* Store our register values back into the inferior. | |
3848 | If REGNO is -1, do this for all registers. | |
3849 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc | 3850 | static void |
442ea881 | 3851 | usr_store_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 3852 | { |
7325beb4 | 3853 | if (regno == -1) |
2ec06d2e | 3854 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
7325beb4 MR |
3855 | store_register (regcache, regno); |
3856 | else | |
3857 | store_register (regcache, regno); | |
da6d8c04 | 3858 | } |
58caa3dc DJ |
3859 | #endif /* HAVE_LINUX_USRREGS */ |
3860 | ||
3861 | ||
3862 | ||
3863 | #ifdef HAVE_LINUX_REGSETS | |
3864 | ||
3865 | static int | |
442ea881 | 3866 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3867 | { |
3868 | struct regset_info *regset; | |
e9d25b98 | 3869 | int saw_general_regs = 0; |
95954743 | 3870 | int pid; |
1570b33e | 3871 | struct iovec iov; |
58caa3dc DJ |
3872 | |
3873 | regset = target_regsets; | |
3874 | ||
95954743 | 3875 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3876 | while (regset->size >= 0) |
3877 | { | |
1570b33e L |
3878 | void *buf, *data; |
3879 | int nt_type, res; | |
58caa3dc | 3880 | |
52fa2412 | 3881 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3882 | { |
3883 | regset ++; | |
3884 | continue; | |
3885 | } | |
3886 | ||
bca929d3 | 3887 | buf = xmalloc (regset->size); |
1570b33e L |
3888 | |
3889 | nt_type = regset->nt_type; | |
3890 | if (nt_type) | |
3891 | { | |
3892 | iov.iov_base = buf; | |
3893 | iov.iov_len = regset->size; | |
3894 | data = (void *) &iov; | |
3895 | } | |
3896 | else | |
3897 | data = buf; | |
3898 | ||
dfb64f85 | 3899 | #ifndef __sparc__ |
1570b33e | 3900 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3901 | #else |
1570b33e | 3902 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 3903 | #endif |
58caa3dc DJ |
3904 | if (res < 0) |
3905 | { | |
3906 | if (errno == EIO) | |
3907 | { | |
52fa2412 UW |
3908 | /* If we get EIO on a regset, do not try it again for |
3909 | this process. */ | |
3910 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3911 | free (buf); |
52fa2412 | 3912 | continue; |
58caa3dc DJ |
3913 | } |
3914 | else | |
3915 | { | |
0d62e5e8 | 3916 | char s[256]; |
95954743 PA |
3917 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
3918 | pid); | |
0d62e5e8 | 3919 | perror (s); |
58caa3dc DJ |
3920 | } |
3921 | } | |
e9d25b98 DJ |
3922 | else if (regset->type == GENERAL_REGS) |
3923 | saw_general_regs = 1; | |
442ea881 | 3924 | regset->store_function (regcache, buf); |
58caa3dc | 3925 | regset ++; |
fdeb2a12 | 3926 | free (buf); |
58caa3dc | 3927 | } |
e9d25b98 DJ |
3928 | if (saw_general_regs) |
3929 | return 0; | |
3930 | else | |
3931 | return 1; | |
58caa3dc DJ |
3932 | } |
3933 | ||
3934 | static int | |
442ea881 | 3935 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3936 | { |
3937 | struct regset_info *regset; | |
e9d25b98 | 3938 | int saw_general_regs = 0; |
95954743 | 3939 | int pid; |
1570b33e | 3940 | struct iovec iov; |
58caa3dc DJ |
3941 | |
3942 | regset = target_regsets; | |
3943 | ||
95954743 | 3944 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3945 | while (regset->size >= 0) |
3946 | { | |
1570b33e L |
3947 | void *buf, *data; |
3948 | int nt_type, res; | |
58caa3dc | 3949 | |
52fa2412 | 3950 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3951 | { |
3952 | regset ++; | |
3953 | continue; | |
3954 | } | |
3955 | ||
bca929d3 | 3956 | buf = xmalloc (regset->size); |
545587ee DJ |
3957 | |
3958 | /* First fill the buffer with the current register set contents, | |
3959 | in case there are any items in the kernel's regset that are | |
3960 | not in gdbserver's regcache. */ | |
1570b33e L |
3961 | |
3962 | nt_type = regset->nt_type; | |
3963 | if (nt_type) | |
3964 | { | |
3965 | iov.iov_base = buf; | |
3966 | iov.iov_len = regset->size; | |
3967 | data = (void *) &iov; | |
3968 | } | |
3969 | else | |
3970 | data = buf; | |
3971 | ||
dfb64f85 | 3972 | #ifndef __sparc__ |
1570b33e | 3973 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3974 | #else |
1570b33e | 3975 | res = ptrace (regset->get_request, pid, &iov, data); |
dfb64f85 | 3976 | #endif |
545587ee DJ |
3977 | |
3978 | if (res == 0) | |
3979 | { | |
3980 | /* Then overlay our cached registers on that. */ | |
442ea881 | 3981 | regset->fill_function (regcache, buf); |
545587ee DJ |
3982 | |
3983 | /* Only now do we write the register set. */ | |
dfb64f85 | 3984 | #ifndef __sparc__ |
1570b33e | 3985 | res = ptrace (regset->set_request, pid, nt_type, data); |
dfb64f85 | 3986 | #else |
1570b33e | 3987 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 3988 | #endif |
545587ee DJ |
3989 | } |
3990 | ||
58caa3dc DJ |
3991 | if (res < 0) |
3992 | { | |
3993 | if (errno == EIO) | |
3994 | { | |
52fa2412 UW |
3995 | /* If we get EIO on a regset, do not try it again for |
3996 | this process. */ | |
3997 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3998 | free (buf); |
52fa2412 | 3999 | continue; |
58caa3dc | 4000 | } |
3221518c UW |
4001 | else if (errno == ESRCH) |
4002 | { | |
1b3f6016 PA |
4003 | /* At this point, ESRCH should mean the process is |
4004 | already gone, in which case we simply ignore attempts | |
4005 | to change its registers. See also the related | |
4006 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4007 | free (buf); |
3221518c UW |
4008 | return 0; |
4009 | } | |
58caa3dc DJ |
4010 | else |
4011 | { | |
ce3a066d | 4012 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4013 | } |
4014 | } | |
e9d25b98 DJ |
4015 | else if (regset->type == GENERAL_REGS) |
4016 | saw_general_regs = 1; | |
58caa3dc | 4017 | regset ++; |
09ec9b38 | 4018 | free (buf); |
58caa3dc | 4019 | } |
e9d25b98 DJ |
4020 | if (saw_general_regs) |
4021 | return 0; | |
4022 | else | |
4023 | return 1; | |
ce3a066d | 4024 | return 0; |
58caa3dc DJ |
4025 | } |
4026 | ||
4027 | #endif /* HAVE_LINUX_REGSETS */ | |
4028 | ||
4029 | ||
4030 | void | |
442ea881 | 4031 | linux_fetch_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
4032 | { |
4033 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 4034 | if (regsets_fetch_inferior_registers (regcache) == 0) |
52fa2412 | 4035 | return; |
58caa3dc DJ |
4036 | #endif |
4037 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 4038 | usr_fetch_inferior_registers (regcache, regno); |
58caa3dc DJ |
4039 | #endif |
4040 | } | |
4041 | ||
4042 | void | |
442ea881 | 4043 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
4044 | { |
4045 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 4046 | if (regsets_store_inferior_registers (regcache) == 0) |
52fa2412 | 4047 | return; |
58caa3dc DJ |
4048 | #endif |
4049 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 4050 | usr_store_inferior_registers (regcache, regno); |
58caa3dc DJ |
4051 | #endif |
4052 | } | |
4053 | ||
da6d8c04 | 4054 | |
da6d8c04 DJ |
4055 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4056 | to debugger memory starting at MYADDR. */ | |
4057 | ||
c3e735a6 | 4058 | static int |
f450004a | 4059 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
4060 | { |
4061 | register int i; | |
4062 | /* Round starting address down to longword boundary. */ | |
4063 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4064 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
4065 | register int count |
4066 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
4067 | / sizeof (PTRACE_XFER_TYPE); |
4068 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 4069 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 4070 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
4071 | int fd; |
4072 | char filename[64]; | |
95954743 | 4073 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
4074 | |
4075 | /* Try using /proc. Don't bother for one word. */ | |
4076 | if (len >= 3 * sizeof (long)) | |
4077 | { | |
4078 | /* We could keep this file open and cache it - possibly one per | |
4079 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4080 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4081 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4082 | if (fd == -1) | |
4083 | goto no_proc; | |
4084 | ||
4085 | /* If pread64 is available, use it. It's faster if the kernel | |
4086 | supports it (only one syscall), and it's 64-bit safe even on | |
4087 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4088 | application). */ | |
4089 | #ifdef HAVE_PREAD64 | |
4090 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
4091 | #else | |
1de1badb | 4092 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
4093 | #endif |
4094 | { | |
4095 | close (fd); | |
4096 | goto no_proc; | |
4097 | } | |
4098 | ||
4099 | close (fd); | |
4100 | return 0; | |
4101 | } | |
da6d8c04 | 4102 | |
fd462a61 | 4103 | no_proc: |
da6d8c04 DJ |
4104 | /* Read all the longwords */ |
4105 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4106 | { | |
c3e735a6 | 4107 | errno = 0; |
14ce3065 DE |
4108 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4109 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4110 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
4111 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
4112 | if (errno) |
4113 | return errno; | |
da6d8c04 DJ |
4114 | } |
4115 | ||
4116 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
4117 | memcpy (myaddr, |
4118 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4119 | len); | |
c3e735a6 DJ |
4120 | |
4121 | return 0; | |
da6d8c04 DJ |
4122 | } |
4123 | ||
93ae6fdc PA |
4124 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4125 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
4126 | returns the value of errno. */ |
4127 | ||
ce3a066d | 4128 | static int |
f450004a | 4129 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4130 | { |
4131 | register int i; | |
4132 | /* Round starting address down to longword boundary. */ | |
4133 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4134 | /* Round ending address up; get number of longwords that makes. */ | |
4135 | register int count | |
493e2a69 MS |
4136 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4137 | / sizeof (PTRACE_XFER_TYPE); | |
4138 | ||
da6d8c04 | 4139 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4140 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4141 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4142 | ||
95954743 | 4143 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4144 | |
0d62e5e8 DJ |
4145 | if (debug_threads) |
4146 | { | |
58d6951d DJ |
4147 | /* Dump up to four bytes. */ |
4148 | unsigned int val = * (unsigned int *) myaddr; | |
4149 | if (len == 1) | |
4150 | val = val & 0xff; | |
4151 | else if (len == 2) | |
4152 | val = val & 0xffff; | |
4153 | else if (len == 3) | |
4154 | val = val & 0xffffff; | |
4155 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4156 | val, (long)memaddr); | |
0d62e5e8 DJ |
4157 | } |
4158 | ||
da6d8c04 DJ |
4159 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4160 | ||
93ae6fdc | 4161 | errno = 0; |
14ce3065 DE |
4162 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4163 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4164 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
4165 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
4166 | if (errno) |
4167 | return errno; | |
da6d8c04 DJ |
4168 | |
4169 | if (count > 1) | |
4170 | { | |
93ae6fdc | 4171 | errno = 0; |
da6d8c04 | 4172 | buffer[count - 1] |
95954743 | 4173 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4174 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4175 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4176 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4177 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 4178 | 0); |
93ae6fdc PA |
4179 | if (errno) |
4180 | return errno; | |
da6d8c04 DJ |
4181 | } |
4182 | ||
93ae6fdc | 4183 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4184 | |
493e2a69 MS |
4185 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4186 | myaddr, len); | |
da6d8c04 DJ |
4187 | |
4188 | /* Write the entire buffer. */ | |
4189 | ||
4190 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4191 | { | |
4192 | errno = 0; | |
14ce3065 DE |
4193 | ptrace (PTRACE_POKETEXT, pid, |
4194 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4195 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4196 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4197 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4198 | if (errno) |
4199 | return errno; | |
4200 | } | |
4201 | ||
4202 | return 0; | |
4203 | } | |
2f2893d9 | 4204 | |
6076632b | 4205 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4206 | static int linux_supports_tracefork_flag; |
4207 | ||
1e7fc18c PA |
4208 | static void |
4209 | linux_enable_event_reporting (int pid) | |
4210 | { | |
4211 | if (!linux_supports_tracefork_flag) | |
4212 | return; | |
4213 | ||
4214 | ptrace (PTRACE_SETOPTIONS, pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
4215 | } | |
4216 | ||
51c2684e | 4217 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4218 | |
51c2684e DJ |
4219 | static int |
4220 | linux_tracefork_grandchild (void *arg) | |
4221 | { | |
4222 | _exit (0); | |
4223 | } | |
4224 | ||
7407e2de AS |
4225 | #define STACK_SIZE 4096 |
4226 | ||
51c2684e DJ |
4227 | static int |
4228 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
4229 | { |
4230 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
4231 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
4232 | |
4233 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4234 | ||
4235 | if (fork () == 0) | |
4236 | linux_tracefork_grandchild (NULL); | |
4237 | ||
4238 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4239 | ||
7407e2de AS |
4240 | #ifdef __ia64__ |
4241 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4242 | CLONE_VM | SIGCHLD, NULL); | |
4243 | #else | |
a1f2ce7d | 4244 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4245 | CLONE_VM | SIGCHLD, NULL); |
4246 | #endif | |
e4b7f41c JK |
4247 | |
4248 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4249 | ||
24a09b5f DJ |
4250 | _exit (0); |
4251 | } | |
4252 | ||
24a09b5f DJ |
4253 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4254 | sure that we can enable the option, and that it had the desired | |
4255 | effect. */ | |
4256 | ||
4257 | static void | |
4258 | linux_test_for_tracefork (void) | |
4259 | { | |
4260 | int child_pid, ret, status; | |
4261 | long second_pid; | |
e4b7f41c | 4262 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4263 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4264 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4265 | |
4266 | linux_supports_tracefork_flag = 0; | |
4267 | ||
e4b7f41c JK |
4268 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4269 | ||
4270 | child_pid = fork (); | |
4271 | if (child_pid == 0) | |
4272 | linux_tracefork_child (NULL); | |
4273 | ||
4274 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4275 | ||
51c2684e | 4276 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4277 | #ifdef __ia64__ |
4278 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4279 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4280 | #else /* !__ia64__ */ |
7407e2de AS |
4281 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4282 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4283 | #endif /* !__ia64__ */ |
4284 | ||
4285 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4286 | ||
24a09b5f | 4287 | if (child_pid == -1) |
51c2684e | 4288 | perror_with_name ("clone"); |
24a09b5f DJ |
4289 | |
4290 | ret = my_waitpid (child_pid, &status, 0); | |
4291 | if (ret == -1) | |
4292 | perror_with_name ("waitpid"); | |
4293 | else if (ret != child_pid) | |
4294 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4295 | if (! WIFSTOPPED (status)) | |
4296 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4297 | ||
14ce3065 DE |
4298 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
4299 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
4300 | if (ret != 0) |
4301 | { | |
4302 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4303 | if (ret != 0) | |
4304 | { | |
4305 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4306 | return; | |
4307 | } | |
4308 | ||
4309 | ret = my_waitpid (child_pid, &status, 0); | |
4310 | if (ret != child_pid) | |
4311 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4312 | else if (!WIFSIGNALED (status)) | |
4313 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4314 | "killed child", status); | |
4315 | ||
4316 | return; | |
4317 | } | |
4318 | ||
4319 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
4320 | if (ret != 0) | |
4321 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4322 | ||
4323 | ret = my_waitpid (child_pid, &status, 0); | |
4324 | ||
4325 | if (ret == child_pid && WIFSTOPPED (status) | |
4326 | && status >> 16 == PTRACE_EVENT_FORK) | |
4327 | { | |
4328 | second_pid = 0; | |
4329 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
4330 | if (ret == 0 && second_pid != 0) | |
4331 | { | |
4332 | int second_status; | |
4333 | ||
4334 | linux_supports_tracefork_flag = 1; | |
4335 | my_waitpid (second_pid, &second_status, 0); | |
4336 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
4337 | if (ret != 0) | |
4338 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4339 | my_waitpid (second_pid, &status, 0); | |
4340 | } | |
4341 | } | |
4342 | else | |
4343 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4344 | "(%d, status 0x%x)", ret, status); | |
4345 | ||
4346 | do | |
4347 | { | |
4348 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
4349 | if (ret != 0) | |
4350 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4351 | my_waitpid (child_pid, &status, 0); | |
4352 | } | |
4353 | while (WIFSTOPPED (status)); | |
51c2684e | 4354 | |
e4b7f41c | 4355 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4356 | free (stack); |
e4b7f41c | 4357 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4358 | } |
4359 | ||
4360 | ||
2f2893d9 DJ |
4361 | static void |
4362 | linux_look_up_symbols (void) | |
4363 | { | |
0d62e5e8 | 4364 | #ifdef USE_THREAD_DB |
95954743 PA |
4365 | struct process_info *proc = current_process (); |
4366 | ||
cdbfd419 | 4367 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4368 | return; |
4369 | ||
6076632b DE |
4370 | /* If the kernel supports tracing forks then it also supports tracing |
4371 | clones, and then we don't need to use the magic thread event breakpoint | |
4372 | to learn about threads. */ | |
cdbfd419 | 4373 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4374 | #endif |
4375 | } | |
4376 | ||
e5379b03 | 4377 | static void |
ef57601b | 4378 | linux_request_interrupt (void) |
e5379b03 | 4379 | { |
a1928bad | 4380 | extern unsigned long signal_pid; |
e5379b03 | 4381 | |
95954743 PA |
4382 | if (!ptid_equal (cont_thread, null_ptid) |
4383 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4384 | { |
54a0b537 | 4385 | struct lwp_info *lwp; |
bd99dc85 | 4386 | int lwpid; |
e5379b03 | 4387 | |
54a0b537 | 4388 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4389 | lwpid = lwpid_of (lwp); |
4390 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4391 | } |
4392 | else | |
ef57601b | 4393 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4394 | } |
4395 | ||
aa691b87 RM |
4396 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4397 | to debugger memory starting at MYADDR. */ | |
4398 | ||
4399 | static int | |
f450004a | 4400 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4401 | { |
4402 | char filename[PATH_MAX]; | |
4403 | int fd, n; | |
95954743 | 4404 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4405 | |
6cebaf6e | 4406 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4407 | |
4408 | fd = open (filename, O_RDONLY); | |
4409 | if (fd < 0) | |
4410 | return -1; | |
4411 | ||
4412 | if (offset != (CORE_ADDR) 0 | |
4413 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4414 | n = -1; | |
4415 | else | |
4416 | n = read (fd, myaddr, len); | |
4417 | ||
4418 | close (fd); | |
4419 | ||
4420 | return n; | |
4421 | } | |
4422 | ||
d993e290 PA |
4423 | /* These breakpoint and watchpoint related wrapper functions simply |
4424 | pass on the function call if the target has registered a | |
4425 | corresponding function. */ | |
e013ee27 OF |
4426 | |
4427 | static int | |
d993e290 | 4428 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4429 | { |
d993e290 PA |
4430 | if (the_low_target.insert_point != NULL) |
4431 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4432 | else |
4433 | /* Unsupported (see target.h). */ | |
4434 | return 1; | |
4435 | } | |
4436 | ||
4437 | static int | |
d993e290 | 4438 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4439 | { |
d993e290 PA |
4440 | if (the_low_target.remove_point != NULL) |
4441 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4442 | else |
4443 | /* Unsupported (see target.h). */ | |
4444 | return 1; | |
4445 | } | |
4446 | ||
4447 | static int | |
4448 | linux_stopped_by_watchpoint (void) | |
4449 | { | |
c3adc08c PA |
4450 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4451 | ||
4452 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4453 | } |
4454 | ||
4455 | static CORE_ADDR | |
4456 | linux_stopped_data_address (void) | |
4457 | { | |
c3adc08c PA |
4458 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4459 | ||
4460 | return lwp->stopped_data_address; | |
e013ee27 OF |
4461 | } |
4462 | ||
42c81e2a | 4463 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
4464 | #if defined(__mcoldfire__) |
4465 | /* These should really be defined in the kernel's ptrace.h header. */ | |
4466 | #define PT_TEXT_ADDR 49*4 | |
4467 | #define PT_DATA_ADDR 50*4 | |
4468 | #define PT_TEXT_END_ADDR 51*4 | |
eb826dc6 MF |
4469 | #elif defined(BFIN) |
4470 | #define PT_TEXT_ADDR 220 | |
4471 | #define PT_TEXT_END_ADDR 224 | |
4472 | #define PT_DATA_ADDR 228 | |
58dbd541 YQ |
4473 | #elif defined(__TMS320C6X__) |
4474 | #define PT_TEXT_ADDR (0x10000*4) | |
4475 | #define PT_DATA_ADDR (0x10004*4) | |
4476 | #define PT_TEXT_END_ADDR (0x10008*4) | |
52fb6437 NS |
4477 | #endif |
4478 | ||
4479 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4480 | to tell gdb about. */ | |
4481 | ||
4482 | static int | |
4483 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4484 | { | |
4485 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
4486 | unsigned long text, text_end, data; | |
bd99dc85 | 4487 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4488 | |
4489 | errno = 0; | |
4490 | ||
4491 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
4492 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
4493 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
4494 | ||
4495 | if (errno == 0) | |
4496 | { | |
4497 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4498 | used by gdb) are relative to the beginning of the program, |
4499 | with the data segment immediately following the text segment. | |
4500 | However, the actual runtime layout in memory may put the data | |
4501 | somewhere else, so when we send gdb a data base-address, we | |
4502 | use the real data base address and subtract the compile-time | |
4503 | data base-address from it (which is just the length of the | |
4504 | text segment). BSS immediately follows data in both | |
4505 | cases. */ | |
52fb6437 NS |
4506 | *text_p = text; |
4507 | *data_p = data - (text_end - text); | |
1b3f6016 | 4508 | |
52fb6437 NS |
4509 | return 1; |
4510 | } | |
4511 | #endif | |
4512 | return 0; | |
4513 | } | |
4514 | #endif | |
4515 | ||
07e059b5 VP |
4516 | static int |
4517 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4518 | unsigned char *readbuf, unsigned const char *writebuf, |
4519 | CORE_ADDR offset, int len) | |
07e059b5 | 4520 | { |
d26e3629 | 4521 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4522 | } |
4523 | ||
d0722149 DE |
4524 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4525 | layout of the inferiors' architecture. */ | |
4526 | ||
4527 | static void | |
4528 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
4529 | { | |
4530 | int done = 0; | |
4531 | ||
4532 | if (the_low_target.siginfo_fixup != NULL) | |
4533 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4534 | ||
4535 | /* If there was no callback, or the callback didn't do anything, | |
4536 | then just do a straight memcpy. */ | |
4537 | if (!done) | |
4538 | { | |
4539 | if (direction == 1) | |
4540 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4541 | else | |
4542 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4543 | } | |
4544 | } | |
4545 | ||
4aa995e1 PA |
4546 | static int |
4547 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4548 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4549 | { | |
d0722149 | 4550 | int pid; |
4aa995e1 | 4551 | struct siginfo siginfo; |
d0722149 | 4552 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4553 | |
4554 | if (current_inferior == NULL) | |
4555 | return -1; | |
4556 | ||
bd99dc85 | 4557 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4558 | |
4559 | if (debug_threads) | |
d0722149 | 4560 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4561 | readbuf != NULL ? "Reading" : "Writing", |
4562 | pid); | |
4563 | ||
0adea5f7 | 4564 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4565 | return -1; |
4566 | ||
4567 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
4568 | return -1; | |
4569 | ||
d0722149 DE |
4570 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4571 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4572 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4573 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4574 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4575 | ||
4aa995e1 PA |
4576 | if (offset + len > sizeof (siginfo)) |
4577 | len = sizeof (siginfo) - offset; | |
4578 | ||
4579 | if (readbuf != NULL) | |
d0722149 | 4580 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4581 | else |
4582 | { | |
d0722149 DE |
4583 | memcpy (inf_siginfo + offset, writebuf, len); |
4584 | ||
4585 | /* Convert back to ptrace layout before flushing it out. */ | |
4586 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4587 | ||
4aa995e1 PA |
4588 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
4589 | return -1; | |
4590 | } | |
4591 | ||
4592 | return len; | |
4593 | } | |
4594 | ||
bd99dc85 PA |
4595 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4596 | so we notice when children change state; as the handler for the | |
4597 | sigsuspend in my_waitpid. */ | |
4598 | ||
4599 | static void | |
4600 | sigchld_handler (int signo) | |
4601 | { | |
4602 | int old_errno = errno; | |
4603 | ||
4604 | if (debug_threads) | |
e581f2b4 PA |
4605 | { |
4606 | do | |
4607 | { | |
4608 | /* fprintf is not async-signal-safe, so call write | |
4609 | directly. */ | |
4610 | if (write (2, "sigchld_handler\n", | |
4611 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4612 | break; /* just ignore */ | |
4613 | } while (0); | |
4614 | } | |
bd99dc85 PA |
4615 | |
4616 | if (target_is_async_p ()) | |
4617 | async_file_mark (); /* trigger a linux_wait */ | |
4618 | ||
4619 | errno = old_errno; | |
4620 | } | |
4621 | ||
4622 | static int | |
4623 | linux_supports_non_stop (void) | |
4624 | { | |
4625 | return 1; | |
4626 | } | |
4627 | ||
4628 | static int | |
4629 | linux_async (int enable) | |
4630 | { | |
4631 | int previous = (linux_event_pipe[0] != -1); | |
4632 | ||
8336d594 PA |
4633 | if (debug_threads) |
4634 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4635 | enable, previous); | |
4636 | ||
bd99dc85 PA |
4637 | if (previous != enable) |
4638 | { | |
4639 | sigset_t mask; | |
4640 | sigemptyset (&mask); | |
4641 | sigaddset (&mask, SIGCHLD); | |
4642 | ||
4643 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4644 | ||
4645 | if (enable) | |
4646 | { | |
4647 | if (pipe (linux_event_pipe) == -1) | |
4648 | fatal ("creating event pipe failed."); | |
4649 | ||
4650 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4651 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4652 | ||
4653 | /* Register the event loop handler. */ | |
4654 | add_file_handler (linux_event_pipe[0], | |
4655 | handle_target_event, NULL); | |
4656 | ||
4657 | /* Always trigger a linux_wait. */ | |
4658 | async_file_mark (); | |
4659 | } | |
4660 | else | |
4661 | { | |
4662 | delete_file_handler (linux_event_pipe[0]); | |
4663 | ||
4664 | close (linux_event_pipe[0]); | |
4665 | close (linux_event_pipe[1]); | |
4666 | linux_event_pipe[0] = -1; | |
4667 | linux_event_pipe[1] = -1; | |
4668 | } | |
4669 | ||
4670 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4671 | } | |
4672 | ||
4673 | return previous; | |
4674 | } | |
4675 | ||
4676 | static int | |
4677 | linux_start_non_stop (int nonstop) | |
4678 | { | |
4679 | /* Register or unregister from event-loop accordingly. */ | |
4680 | linux_async (nonstop); | |
4681 | return 0; | |
4682 | } | |
4683 | ||
cf8fd78b PA |
4684 | static int |
4685 | linux_supports_multi_process (void) | |
4686 | { | |
4687 | return 1; | |
4688 | } | |
4689 | ||
03583c20 UW |
4690 | static int |
4691 | linux_supports_disable_randomization (void) | |
4692 | { | |
4693 | #ifdef HAVE_PERSONALITY | |
4694 | return 1; | |
4695 | #else | |
4696 | return 0; | |
4697 | #endif | |
4698 | } | |
efcbbd14 UW |
4699 | |
4700 | /* Enumerate spufs IDs for process PID. */ | |
4701 | static int | |
4702 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
4703 | { | |
4704 | int pos = 0; | |
4705 | int written = 0; | |
4706 | char path[128]; | |
4707 | DIR *dir; | |
4708 | struct dirent *entry; | |
4709 | ||
4710 | sprintf (path, "/proc/%ld/fd", pid); | |
4711 | dir = opendir (path); | |
4712 | if (!dir) | |
4713 | return -1; | |
4714 | ||
4715 | rewinddir (dir); | |
4716 | while ((entry = readdir (dir)) != NULL) | |
4717 | { | |
4718 | struct stat st; | |
4719 | struct statfs stfs; | |
4720 | int fd; | |
4721 | ||
4722 | fd = atoi (entry->d_name); | |
4723 | if (!fd) | |
4724 | continue; | |
4725 | ||
4726 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4727 | if (stat (path, &st) != 0) | |
4728 | continue; | |
4729 | if (!S_ISDIR (st.st_mode)) | |
4730 | continue; | |
4731 | ||
4732 | if (statfs (path, &stfs) != 0) | |
4733 | continue; | |
4734 | if (stfs.f_type != SPUFS_MAGIC) | |
4735 | continue; | |
4736 | ||
4737 | if (pos >= offset && pos + 4 <= offset + len) | |
4738 | { | |
4739 | *(unsigned int *)(buf + pos - offset) = fd; | |
4740 | written += 4; | |
4741 | } | |
4742 | pos += 4; | |
4743 | } | |
4744 | ||
4745 | closedir (dir); | |
4746 | return written; | |
4747 | } | |
4748 | ||
4749 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4750 | object type, using the /proc file system. */ | |
4751 | static int | |
4752 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4753 | unsigned const char *writebuf, | |
4754 | CORE_ADDR offset, int len) | |
4755 | { | |
4756 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4757 | char buf[128]; | |
4758 | int fd = 0; | |
4759 | int ret = 0; | |
4760 | ||
4761 | if (!writebuf && !readbuf) | |
4762 | return -1; | |
4763 | ||
4764 | if (!*annex) | |
4765 | { | |
4766 | if (!readbuf) | |
4767 | return -1; | |
4768 | else | |
4769 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4770 | } | |
4771 | ||
4772 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
4773 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4774 | if (fd <= 0) | |
4775 | return -1; | |
4776 | ||
4777 | if (offset != 0 | |
4778 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4779 | { | |
4780 | close (fd); | |
4781 | return 0; | |
4782 | } | |
4783 | ||
4784 | if (writebuf) | |
4785 | ret = write (fd, writebuf, (size_t) len); | |
4786 | else | |
4787 | ret = read (fd, readbuf, (size_t) len); | |
4788 | ||
4789 | close (fd); | |
4790 | return ret; | |
4791 | } | |
4792 | ||
723b724b | 4793 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
4794 | struct target_loadseg |
4795 | { | |
4796 | /* Core address to which the segment is mapped. */ | |
4797 | Elf32_Addr addr; | |
4798 | /* VMA recorded in the program header. */ | |
4799 | Elf32_Addr p_vaddr; | |
4800 | /* Size of this segment in memory. */ | |
4801 | Elf32_Word p_memsz; | |
4802 | }; | |
4803 | ||
723b724b | 4804 | # if defined PT_GETDSBT |
78d85199 YQ |
4805 | struct target_loadmap |
4806 | { | |
4807 | /* Protocol version number, must be zero. */ | |
4808 | Elf32_Word version; | |
4809 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
4810 | unsigned *dsbt_table; | |
4811 | unsigned dsbt_size, dsbt_index; | |
4812 | /* Number of segments in this map. */ | |
4813 | Elf32_Word nsegs; | |
4814 | /* The actual memory map. */ | |
4815 | struct target_loadseg segs[/*nsegs*/]; | |
4816 | }; | |
723b724b MF |
4817 | # define LINUX_LOADMAP PT_GETDSBT |
4818 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
4819 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
4820 | # else | |
4821 | struct target_loadmap | |
4822 | { | |
4823 | /* Protocol version number, must be zero. */ | |
4824 | Elf32_Half version; | |
4825 | /* Number of segments in this map. */ | |
4826 | Elf32_Half nsegs; | |
4827 | /* The actual memory map. */ | |
4828 | struct target_loadseg segs[/*nsegs*/]; | |
4829 | }; | |
4830 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
4831 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
4832 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
4833 | # endif | |
78d85199 | 4834 | |
78d85199 YQ |
4835 | static int |
4836 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
4837 | unsigned char *myaddr, unsigned int len) | |
4838 | { | |
4839 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4840 | int addr = -1; | |
4841 | struct target_loadmap *data = NULL; | |
4842 | unsigned int actual_length, copy_length; | |
4843 | ||
4844 | if (strcmp (annex, "exec") == 0) | |
723b724b | 4845 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 4846 | else if (strcmp (annex, "interp") == 0) |
723b724b | 4847 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
4848 | else |
4849 | return -1; | |
4850 | ||
723b724b | 4851 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
4852 | return -1; |
4853 | ||
4854 | if (data == NULL) | |
4855 | return -1; | |
4856 | ||
4857 | actual_length = sizeof (struct target_loadmap) | |
4858 | + sizeof (struct target_loadseg) * data->nsegs; | |
4859 | ||
4860 | if (offset < 0 || offset > actual_length) | |
4861 | return -1; | |
4862 | ||
4863 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
4864 | memcpy (myaddr, (char *) data + offset, copy_length); | |
4865 | return copy_length; | |
4866 | } | |
723b724b MF |
4867 | #else |
4868 | # define linux_read_loadmap NULL | |
4869 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 4870 | |
1570b33e L |
4871 | static void |
4872 | linux_process_qsupported (const char *query) | |
4873 | { | |
4874 | if (the_low_target.process_qsupported != NULL) | |
4875 | the_low_target.process_qsupported (query); | |
4876 | } | |
4877 | ||
219f2f23 PA |
4878 | static int |
4879 | linux_supports_tracepoints (void) | |
4880 | { | |
4881 | if (*the_low_target.supports_tracepoints == NULL) | |
4882 | return 0; | |
4883 | ||
4884 | return (*the_low_target.supports_tracepoints) (); | |
4885 | } | |
4886 | ||
4887 | static CORE_ADDR | |
4888 | linux_read_pc (struct regcache *regcache) | |
4889 | { | |
4890 | if (the_low_target.get_pc == NULL) | |
4891 | return 0; | |
4892 | ||
4893 | return (*the_low_target.get_pc) (regcache); | |
4894 | } | |
4895 | ||
4896 | static void | |
4897 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
4898 | { | |
4899 | gdb_assert (the_low_target.set_pc != NULL); | |
4900 | ||
4901 | (*the_low_target.set_pc) (regcache, pc); | |
4902 | } | |
4903 | ||
8336d594 PA |
4904 | static int |
4905 | linux_thread_stopped (struct thread_info *thread) | |
4906 | { | |
4907 | return get_thread_lwp (thread)->stopped; | |
4908 | } | |
4909 | ||
4910 | /* This exposes stop-all-threads functionality to other modules. */ | |
4911 | ||
4912 | static void | |
7984d532 | 4913 | linux_pause_all (int freeze) |
8336d594 | 4914 | { |
7984d532 PA |
4915 | stop_all_lwps (freeze, NULL); |
4916 | } | |
4917 | ||
4918 | /* This exposes unstop-all-threads functionality to other gdbserver | |
4919 | modules. */ | |
4920 | ||
4921 | static void | |
4922 | linux_unpause_all (int unfreeze) | |
4923 | { | |
4924 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
4925 | } |
4926 | ||
90d74c30 PA |
4927 | static int |
4928 | linux_prepare_to_access_memory (void) | |
4929 | { | |
4930 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
4931 | running LWP. */ | |
4932 | if (non_stop) | |
4933 | linux_pause_all (1); | |
4934 | return 0; | |
4935 | } | |
4936 | ||
4937 | static void | |
0146f85b | 4938 | linux_done_accessing_memory (void) |
90d74c30 PA |
4939 | { |
4940 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
4941 | running LWP. */ | |
4942 | if (non_stop) | |
4943 | linux_unpause_all (1); | |
4944 | } | |
4945 | ||
fa593d66 PA |
4946 | static int |
4947 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
4948 | CORE_ADDR collector, | |
4949 | CORE_ADDR lockaddr, | |
4950 | ULONGEST orig_size, | |
4951 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
4952 | CORE_ADDR *trampoline, |
4953 | ULONGEST *trampoline_size, | |
fa593d66 PA |
4954 | unsigned char *jjump_pad_insn, |
4955 | ULONGEST *jjump_pad_insn_size, | |
4956 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
4957 | CORE_ADDR *adjusted_insn_addr_end, |
4958 | char *err) | |
fa593d66 PA |
4959 | { |
4960 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
4961 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
4962 | jump_entry, trampoline, trampoline_size, |
4963 | jjump_pad_insn, jjump_pad_insn_size, | |
4964 | adjusted_insn_addr, adjusted_insn_addr_end, | |
4965 | err); | |
fa593d66 PA |
4966 | } |
4967 | ||
6a271cae PA |
4968 | static struct emit_ops * |
4969 | linux_emit_ops (void) | |
4970 | { | |
4971 | if (the_low_target.emit_ops != NULL) | |
4972 | return (*the_low_target.emit_ops) (); | |
4973 | else | |
4974 | return NULL; | |
4975 | } | |
4976 | ||
405f8e94 SS |
4977 | static int |
4978 | linux_get_min_fast_tracepoint_insn_len (void) | |
4979 | { | |
4980 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
4981 | } | |
4982 | ||
2268b414 JK |
4983 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
4984 | ||
4985 | static int | |
4986 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
4987 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
4988 | { | |
4989 | char filename[PATH_MAX]; | |
4990 | int fd; | |
4991 | const int auxv_size = is_elf64 | |
4992 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
4993 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
4994 | ||
4995 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
4996 | ||
4997 | fd = open (filename, O_RDONLY); | |
4998 | if (fd < 0) | |
4999 | return 1; | |
5000 | ||
5001 | *phdr_memaddr = 0; | |
5002 | *num_phdr = 0; | |
5003 | while (read (fd, buf, auxv_size) == auxv_size | |
5004 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5005 | { | |
5006 | if (is_elf64) | |
5007 | { | |
5008 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5009 | ||
5010 | switch (aux->a_type) | |
5011 | { | |
5012 | case AT_PHDR: | |
5013 | *phdr_memaddr = aux->a_un.a_val; | |
5014 | break; | |
5015 | case AT_PHNUM: | |
5016 | *num_phdr = aux->a_un.a_val; | |
5017 | break; | |
5018 | } | |
5019 | } | |
5020 | else | |
5021 | { | |
5022 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5023 | ||
5024 | switch (aux->a_type) | |
5025 | { | |
5026 | case AT_PHDR: | |
5027 | *phdr_memaddr = aux->a_un.a_val; | |
5028 | break; | |
5029 | case AT_PHNUM: | |
5030 | *num_phdr = aux->a_un.a_val; | |
5031 | break; | |
5032 | } | |
5033 | } | |
5034 | } | |
5035 | ||
5036 | close (fd); | |
5037 | ||
5038 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5039 | { | |
5040 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5041 | "phdr_memaddr = %ld, phdr_num = %d", | |
5042 | (long) *phdr_memaddr, *num_phdr); | |
5043 | return 2; | |
5044 | } | |
5045 | ||
5046 | return 0; | |
5047 | } | |
5048 | ||
5049 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5050 | ||
5051 | static CORE_ADDR | |
5052 | get_dynamic (const int pid, const int is_elf64) | |
5053 | { | |
5054 | CORE_ADDR phdr_memaddr, relocation; | |
5055 | int num_phdr, i; | |
5056 | unsigned char *phdr_buf; | |
5057 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5058 | ||
5059 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5060 | return 0; | |
5061 | ||
5062 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5063 | phdr_buf = alloca (num_phdr * phdr_size); | |
5064 | ||
5065 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5066 | return 0; | |
5067 | ||
5068 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5069 | non-zero for PIE ones. */ | |
5070 | relocation = -1; | |
5071 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5072 | if (is_elf64) | |
5073 | { | |
5074 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5075 | ||
5076 | if (p->p_type == PT_PHDR) | |
5077 | relocation = phdr_memaddr - p->p_vaddr; | |
5078 | } | |
5079 | else | |
5080 | { | |
5081 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5082 | ||
5083 | if (p->p_type == PT_PHDR) | |
5084 | relocation = phdr_memaddr - p->p_vaddr; | |
5085 | } | |
5086 | ||
5087 | if (relocation == -1) | |
5088 | { | |
5089 | warning ("Unexpected missing PT_PHDR"); | |
5090 | return 0; | |
5091 | } | |
5092 | ||
5093 | for (i = 0; i < num_phdr; i++) | |
5094 | { | |
5095 | if (is_elf64) | |
5096 | { | |
5097 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5098 | ||
5099 | if (p->p_type == PT_DYNAMIC) | |
5100 | return p->p_vaddr + relocation; | |
5101 | } | |
5102 | else | |
5103 | { | |
5104 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5105 | ||
5106 | if (p->p_type == PT_DYNAMIC) | |
5107 | return p->p_vaddr + relocation; | |
5108 | } | |
5109 | } | |
5110 | ||
5111 | return 0; | |
5112 | } | |
5113 | ||
5114 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
5115 | can be 0 if the inferior does not yet have the library list initialized. */ | |
5116 | ||
5117 | static CORE_ADDR | |
5118 | get_r_debug (const int pid, const int is_elf64) | |
5119 | { | |
5120 | CORE_ADDR dynamic_memaddr; | |
5121 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5122 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
5123 | ||
5124 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5125 | if (dynamic_memaddr == 0) | |
5126 | return (CORE_ADDR) -1; | |
5127 | ||
5128 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5129 | { | |
5130 | if (is_elf64) | |
5131 | { | |
5132 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
5133 | ||
5134 | if (dyn->d_tag == DT_DEBUG) | |
5135 | return dyn->d_un.d_val; | |
5136 | ||
5137 | if (dyn->d_tag == DT_NULL) | |
5138 | break; | |
5139 | } | |
5140 | else | |
5141 | { | |
5142 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
5143 | ||
5144 | if (dyn->d_tag == DT_DEBUG) | |
5145 | return dyn->d_un.d_val; | |
5146 | ||
5147 | if (dyn->d_tag == DT_NULL) | |
5148 | break; | |
5149 | } | |
5150 | ||
5151 | dynamic_memaddr += dyn_size; | |
5152 | } | |
5153 | ||
5154 | return (CORE_ADDR) -1; | |
5155 | } | |
5156 | ||
5157 | /* Read one pointer from MEMADDR in the inferior. */ | |
5158 | ||
5159 | static int | |
5160 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5161 | { | |
5162 | *ptr = 0; | |
5163 | return linux_read_memory (memaddr, (unsigned char *) ptr, ptr_size); | |
5164 | } | |
5165 | ||
5166 | struct link_map_offsets | |
5167 | { | |
5168 | /* Offset and size of r_debug.r_version. */ | |
5169 | int r_version_offset; | |
5170 | ||
5171 | /* Offset and size of r_debug.r_map. */ | |
5172 | int r_map_offset; | |
5173 | ||
5174 | /* Offset to l_addr field in struct link_map. */ | |
5175 | int l_addr_offset; | |
5176 | ||
5177 | /* Offset to l_name field in struct link_map. */ | |
5178 | int l_name_offset; | |
5179 | ||
5180 | /* Offset to l_ld field in struct link_map. */ | |
5181 | int l_ld_offset; | |
5182 | ||
5183 | /* Offset to l_next field in struct link_map. */ | |
5184 | int l_next_offset; | |
5185 | ||
5186 | /* Offset to l_prev field in struct link_map. */ | |
5187 | int l_prev_offset; | |
5188 | }; | |
5189 | ||
5190 | /* Construct qXfer:libraries:read reply. */ | |
5191 | ||
5192 | static int | |
5193 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5194 | unsigned const char *writebuf, | |
5195 | CORE_ADDR offset, int len) | |
5196 | { | |
5197 | char *document; | |
5198 | unsigned document_len; | |
5199 | struct process_info_private *const priv = current_process ()->private; | |
5200 | char filename[PATH_MAX]; | |
5201 | int pid, is_elf64; | |
5202 | ||
5203 | static const struct link_map_offsets lmo_32bit_offsets = | |
5204 | { | |
5205 | 0, /* r_version offset. */ | |
5206 | 4, /* r_debug.r_map offset. */ | |
5207 | 0, /* l_addr offset in link_map. */ | |
5208 | 4, /* l_name offset in link_map. */ | |
5209 | 8, /* l_ld offset in link_map. */ | |
5210 | 12, /* l_next offset in link_map. */ | |
5211 | 16 /* l_prev offset in link_map. */ | |
5212 | }; | |
5213 | ||
5214 | static const struct link_map_offsets lmo_64bit_offsets = | |
5215 | { | |
5216 | 0, /* r_version offset. */ | |
5217 | 8, /* r_debug.r_map offset. */ | |
5218 | 0, /* l_addr offset in link_map. */ | |
5219 | 8, /* l_name offset in link_map. */ | |
5220 | 16, /* l_ld offset in link_map. */ | |
5221 | 24, /* l_next offset in link_map. */ | |
5222 | 32 /* l_prev offset in link_map. */ | |
5223 | }; | |
5224 | const struct link_map_offsets *lmo; | |
5225 | ||
5226 | if (writebuf != NULL) | |
5227 | return -2; | |
5228 | if (readbuf == NULL) | |
5229 | return -1; | |
5230 | ||
5231 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5232 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
5233 | is_elf64 = elf_64_file_p (filename); | |
5234 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; | |
5235 | ||
5236 | if (priv->r_debug == 0) | |
5237 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5238 | ||
5239 | if (priv->r_debug == (CORE_ADDR) -1 || priv->r_debug == 0) | |
5240 | { | |
5241 | document = xstrdup ("<library-list-svr4 version=\"1.0\"/>\n"); | |
5242 | } | |
5243 | else | |
5244 | { | |
5245 | int allocated = 1024; | |
5246 | char *p; | |
5247 | const int ptr_size = is_elf64 ? 8 : 4; | |
5248 | CORE_ADDR lm_addr, lm_prev, l_name, l_addr, l_ld, l_next, l_prev; | |
5249 | int r_version, header_done = 0; | |
5250 | ||
5251 | document = xmalloc (allocated); | |
5252 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5253 | p = document + strlen (document); | |
5254 | ||
5255 | r_version = 0; | |
5256 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, | |
5257 | (unsigned char *) &r_version, | |
5258 | sizeof (r_version)) != 0 | |
5259 | || r_version != 1) | |
5260 | { | |
5261 | warning ("unexpected r_debug version %d", r_version); | |
5262 | goto done; | |
5263 | } | |
5264 | ||
5265 | if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5266 | &lm_addr, ptr_size) != 0) | |
5267 | { | |
5268 | warning ("unable to read r_map from 0x%lx", | |
5269 | (long) priv->r_debug + lmo->r_map_offset); | |
5270 | goto done; | |
5271 | } | |
5272 | ||
5273 | lm_prev = 0; | |
5274 | while (read_one_ptr (lm_addr + lmo->l_name_offset, | |
5275 | &l_name, ptr_size) == 0 | |
5276 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5277 | &l_addr, ptr_size) == 0 | |
5278 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5279 | &l_ld, ptr_size) == 0 | |
5280 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5281 | &l_prev, ptr_size) == 0 | |
5282 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5283 | &l_next, ptr_size) == 0) | |
5284 | { | |
5285 | unsigned char libname[PATH_MAX]; | |
5286 | ||
5287 | if (lm_prev != l_prev) | |
5288 | { | |
5289 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", | |
5290 | (long) lm_prev, (long) l_prev); | |
5291 | break; | |
5292 | } | |
5293 | ||
5294 | /* Not checking for error because reading may stop before | |
5295 | we've got PATH_MAX worth of characters. */ | |
5296 | libname[0] = '\0'; | |
5297 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5298 | libname[sizeof (libname) - 1] = '\0'; | |
5299 | if (libname[0] != '\0') | |
5300 | { | |
5301 | /* 6x the size for xml_escape_text below. */ | |
5302 | size_t len = 6 * strlen ((char *) libname); | |
5303 | char *name; | |
5304 | ||
5305 | if (!header_done) | |
5306 | { | |
5307 | /* Terminate `<library-list-svr4'. */ | |
5308 | *p++ = '>'; | |
5309 | header_done = 1; | |
5310 | } | |
5311 | ||
5312 | while (allocated < p - document + len + 200) | |
5313 | { | |
5314 | /* Expand to guarantee sufficient storage. */ | |
5315 | uintptr_t document_len = p - document; | |
5316 | ||
5317 | document = xrealloc (document, 2 * allocated); | |
5318 | allocated *= 2; | |
5319 | p = document + document_len; | |
5320 | } | |
5321 | ||
5322 | name = xml_escape_text ((char *) libname); | |
5323 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5324 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5325 | name, (unsigned long) lm_addr, | |
5326 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5327 | free (name); | |
5328 | } | |
5329 | else if (lm_prev == 0) | |
5330 | { | |
5331 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); | |
5332 | p = p + strlen (p); | |
5333 | } | |
5334 | ||
5335 | if (l_next == 0) | |
5336 | break; | |
5337 | ||
5338 | lm_prev = lm_addr; | |
5339 | lm_addr = l_next; | |
5340 | } | |
5341 | done: | |
5342 | strcpy (p, "</library-list-svr4>"); | |
5343 | } | |
5344 | ||
5345 | document_len = strlen (document); | |
5346 | if (offset < document_len) | |
5347 | document_len -= offset; | |
5348 | else | |
5349 | document_len = 0; | |
5350 | if (len > document_len) | |
5351 | len = document_len; | |
5352 | ||
5353 | memcpy (readbuf, document + offset, len); | |
5354 | xfree (document); | |
5355 | ||
5356 | return len; | |
5357 | } | |
5358 | ||
ce3a066d DJ |
5359 | static struct target_ops linux_target_ops = { |
5360 | linux_create_inferior, | |
5361 | linux_attach, | |
5362 | linux_kill, | |
6ad8ae5c | 5363 | linux_detach, |
8336d594 | 5364 | linux_mourn, |
444d6139 | 5365 | linux_join, |
ce3a066d DJ |
5366 | linux_thread_alive, |
5367 | linux_resume, | |
5368 | linux_wait, | |
5369 | linux_fetch_registers, | |
5370 | linux_store_registers, | |
90d74c30 | 5371 | linux_prepare_to_access_memory, |
0146f85b | 5372 | linux_done_accessing_memory, |
ce3a066d DJ |
5373 | linux_read_memory, |
5374 | linux_write_memory, | |
2f2893d9 | 5375 | linux_look_up_symbols, |
ef57601b | 5376 | linux_request_interrupt, |
aa691b87 | 5377 | linux_read_auxv, |
d993e290 PA |
5378 | linux_insert_point, |
5379 | linux_remove_point, | |
e013ee27 OF |
5380 | linux_stopped_by_watchpoint, |
5381 | linux_stopped_data_address, | |
42c81e2a | 5382 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 5383 | linux_read_offsets, |
dae5f5cf DJ |
5384 | #else |
5385 | NULL, | |
5386 | #endif | |
5387 | #ifdef USE_THREAD_DB | |
5388 | thread_db_get_tls_address, | |
5389 | #else | |
5390 | NULL, | |
52fb6437 | 5391 | #endif |
efcbbd14 | 5392 | linux_qxfer_spu, |
59a016f0 | 5393 | hostio_last_error_from_errno, |
07e059b5 | 5394 | linux_qxfer_osdata, |
4aa995e1 | 5395 | linux_xfer_siginfo, |
bd99dc85 PA |
5396 | linux_supports_non_stop, |
5397 | linux_async, | |
5398 | linux_start_non_stop, | |
cdbfd419 PP |
5399 | linux_supports_multi_process, |
5400 | #ifdef USE_THREAD_DB | |
dc146f7c | 5401 | thread_db_handle_monitor_command, |
cdbfd419 | 5402 | #else |
dc146f7c | 5403 | NULL, |
cdbfd419 | 5404 | #endif |
d26e3629 | 5405 | linux_common_core_of_thread, |
78d85199 | 5406 | linux_read_loadmap, |
219f2f23 PA |
5407 | linux_process_qsupported, |
5408 | linux_supports_tracepoints, | |
5409 | linux_read_pc, | |
8336d594 PA |
5410 | linux_write_pc, |
5411 | linux_thread_stopped, | |
7984d532 | 5412 | NULL, |
711e434b | 5413 | linux_pause_all, |
7984d532 | 5414 | linux_unpause_all, |
fa593d66 PA |
5415 | linux_cancel_breakpoints, |
5416 | linux_stabilize_threads, | |
6a271cae | 5417 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
5418 | linux_emit_ops, |
5419 | linux_supports_disable_randomization, | |
405f8e94 | 5420 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 5421 | linux_qxfer_libraries_svr4, |
ce3a066d DJ |
5422 | }; |
5423 | ||
0d62e5e8 DJ |
5424 | static void |
5425 | linux_init_signals () | |
5426 | { | |
5427 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5428 | to find what the cancel signal actually is. */ | |
1a981360 | 5429 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5430 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5431 | #endif |
0d62e5e8 DJ |
5432 | } |
5433 | ||
da6d8c04 DJ |
5434 | void |
5435 | initialize_low (void) | |
5436 | { | |
bd99dc85 PA |
5437 | struct sigaction sigchld_action; |
5438 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5439 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5440 | set_breakpoint_data (the_low_target.breakpoint, |
5441 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5442 | linux_init_signals (); |
24a09b5f | 5443 | linux_test_for_tracefork (); |
52fa2412 UW |
5444 | #ifdef HAVE_LINUX_REGSETS |
5445 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
5446 | ; | |
bca929d3 | 5447 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 5448 | #endif |
bd99dc85 PA |
5449 | |
5450 | sigchld_action.sa_handler = sigchld_handler; | |
5451 | sigemptyset (&sigchld_action.sa_mask); | |
5452 | sigchld_action.sa_flags = SA_RESTART; | |
5453 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 5454 | } |