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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, |
4c38e0a4 | 3 | 2006, 2007, 2008, 2009, 2010 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" |
da6d8c04 | 22 | |
58caa3dc | 23 | #include <sys/wait.h> |
da6d8c04 DJ |
24 | #include <stdio.h> |
25 | #include <sys/param.h> | |
da6d8c04 | 26 | #include <sys/ptrace.h> |
da6d8c04 DJ |
27 | #include <signal.h> |
28 | #include <sys/ioctl.h> | |
29 | #include <fcntl.h> | |
d07c63e7 | 30 | #include <string.h> |
0a30fbc4 DJ |
31 | #include <stdlib.h> |
32 | #include <unistd.h> | |
fa6a77dc | 33 | #include <errno.h> |
fd500816 | 34 | #include <sys/syscall.h> |
f9387fc3 | 35 | #include <sched.h> |
07e059b5 VP |
36 | #include <ctype.h> |
37 | #include <pwd.h> | |
38 | #include <sys/types.h> | |
39 | #include <dirent.h> | |
efcbbd14 UW |
40 | #include <sys/stat.h> |
41 | #include <sys/vfs.h> | |
1570b33e | 42 | #include <sys/uio.h> |
957f3f49 DE |
43 | #ifndef ELFMAG0 |
44 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
45 | then ELFMAG0 will have been defined. If it didn't get included by | |
46 | gdb_proc_service.h then including it will likely introduce a duplicate | |
47 | definition of elf_fpregset_t. */ | |
48 | #include <elf.h> | |
49 | #endif | |
efcbbd14 UW |
50 | |
51 | #ifndef SPUFS_MAGIC | |
52 | #define SPUFS_MAGIC 0x23c9b64e | |
53 | #endif | |
da6d8c04 | 54 | |
32ca6d61 DJ |
55 | #ifndef PTRACE_GETSIGINFO |
56 | # define PTRACE_GETSIGINFO 0x4202 | |
57 | # define PTRACE_SETSIGINFO 0x4203 | |
58 | #endif | |
59 | ||
fd462a61 DJ |
60 | #ifndef O_LARGEFILE |
61 | #define O_LARGEFILE 0 | |
62 | #endif | |
63 | ||
24a09b5f DJ |
64 | /* If the system headers did not provide the constants, hard-code the normal |
65 | values. */ | |
66 | #ifndef PTRACE_EVENT_FORK | |
67 | ||
68 | #define PTRACE_SETOPTIONS 0x4200 | |
69 | #define PTRACE_GETEVENTMSG 0x4201 | |
70 | ||
71 | /* options set using PTRACE_SETOPTIONS */ | |
72 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
73 | #define PTRACE_O_TRACEFORK 0x00000002 | |
74 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
75 | #define PTRACE_O_TRACECLONE 0x00000008 | |
76 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
77 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 | |
78 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
79 | ||
80 | /* Wait extended result codes for the above trace options. */ | |
81 | #define PTRACE_EVENT_FORK 1 | |
82 | #define PTRACE_EVENT_VFORK 2 | |
83 | #define PTRACE_EVENT_CLONE 3 | |
84 | #define PTRACE_EVENT_EXEC 4 | |
85 | #define PTRACE_EVENT_VFORK_DONE 5 | |
86 | #define PTRACE_EVENT_EXIT 6 | |
87 | ||
88 | #endif /* PTRACE_EVENT_FORK */ | |
89 | ||
90 | /* We can't always assume that this flag is available, but all systems | |
91 | with the ptrace event handlers also have __WALL, so it's safe to use | |
92 | in some contexts. */ | |
93 | #ifndef __WALL | |
94 | #define __WALL 0x40000000 /* Wait for any child. */ | |
95 | #endif | |
96 | ||
ec8ebe72 DE |
97 | #ifndef W_STOPCODE |
98 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
99 | #endif | |
100 | ||
42c81e2a DJ |
101 | #ifdef __UCLIBC__ |
102 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
103 | #define HAS_NOMMU | |
104 | #endif | |
105 | #endif | |
106 | ||
24a09b5f DJ |
107 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
108 | representation of the thread ID. | |
611cb4a5 | 109 | |
54a0b537 | 110 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
111 | the same as the LWP ID. |
112 | ||
113 | ``all_processes'' is keyed by the "overall process ID", which | |
114 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 115 | |
54a0b537 | 116 | struct inferior_list all_lwps; |
0d62e5e8 | 117 | |
24a09b5f DJ |
118 | /* A list of all unknown processes which receive stop signals. Some other |
119 | process will presumably claim each of these as forked children | |
120 | momentarily. */ | |
121 | ||
122 | struct inferior_list stopped_pids; | |
123 | ||
0d62e5e8 DJ |
124 | /* FIXME this is a bit of a hack, and could be removed. */ |
125 | int stopping_threads; | |
126 | ||
127 | /* FIXME make into a target method? */ | |
24a09b5f | 128 | int using_threads = 1; |
24a09b5f | 129 | |
95954743 PA |
130 | /* This flag is true iff we've just created or attached to our first |
131 | inferior but it has not stopped yet. As soon as it does, we need | |
132 | to call the low target's arch_setup callback. Doing this only on | |
133 | the first inferior avoids reinializing the architecture on every | |
134 | inferior, and avoids messing with the register caches of the | |
135 | already running inferiors. NOTE: this assumes all inferiors under | |
136 | control of gdbserver have the same architecture. */ | |
d61ddec4 UW |
137 | static int new_inferior; |
138 | ||
2acc282a | 139 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 140 | int step, int signal, siginfo_t *info); |
2bd7c093 | 141 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
54a0b537 | 142 | static void stop_all_lwps (void); |
95954743 | 143 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 144 | static void *add_lwp (ptid_t ptid); |
c35fafde | 145 | static int linux_stopped_by_watchpoint (void); |
95954743 | 146 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
dc146f7c | 147 | static int linux_core_of_thread (ptid_t ptid); |
d50171e4 PA |
148 | static void proceed_all_lwps (void); |
149 | static void unstop_all_lwps (struct lwp_info *except); | |
d50171e4 PA |
150 | static int finish_step_over (struct lwp_info *lwp); |
151 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
152 | static int kill_lwp (unsigned long lwpid, int signo); | |
153 | ||
154 | /* True if the low target can hardware single-step. Such targets | |
155 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
156 | ||
157 | static int | |
158 | can_hardware_single_step (void) | |
159 | { | |
160 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
161 | } | |
162 | ||
163 | /* True if the low target supports memory breakpoints. If so, we'll | |
164 | have a GET_PC implementation. */ | |
165 | ||
166 | static int | |
167 | supports_breakpoints (void) | |
168 | { | |
169 | return (the_low_target.get_pc != NULL); | |
170 | } | |
0d62e5e8 DJ |
171 | |
172 | struct pending_signals | |
173 | { | |
174 | int signal; | |
32ca6d61 | 175 | siginfo_t info; |
0d62e5e8 DJ |
176 | struct pending_signals *prev; |
177 | }; | |
611cb4a5 | 178 | |
14ce3065 DE |
179 | #define PTRACE_ARG3_TYPE void * |
180 | #define PTRACE_ARG4_TYPE void * | |
c6ecbae5 | 181 | #define PTRACE_XFER_TYPE long |
da6d8c04 | 182 | |
58caa3dc | 183 | #ifdef HAVE_LINUX_REGSETS |
52fa2412 UW |
184 | static char *disabled_regsets; |
185 | static int num_regsets; | |
58caa3dc DJ |
186 | #endif |
187 | ||
bd99dc85 PA |
188 | /* The read/write ends of the pipe registered as waitable file in the |
189 | event loop. */ | |
190 | static int linux_event_pipe[2] = { -1, -1 }; | |
191 | ||
192 | /* True if we're currently in async mode. */ | |
193 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
194 | ||
195 | static void send_sigstop (struct inferior_list_entry *entry); | |
196 | static void wait_for_sigstop (struct inferior_list_entry *entry); | |
197 | ||
d0722149 DE |
198 | /* Accepts an integer PID; Returns a string representing a file that |
199 | can be opened to get info for the child process. | |
200 | Space for the result is malloc'd, caller must free. */ | |
201 | ||
202 | char * | |
203 | linux_child_pid_to_exec_file (int pid) | |
204 | { | |
205 | char *name1, *name2; | |
206 | ||
207 | name1 = xmalloc (MAXPATHLEN); | |
208 | name2 = xmalloc (MAXPATHLEN); | |
209 | memset (name2, 0, MAXPATHLEN); | |
210 | ||
211 | sprintf (name1, "/proc/%d/exe", pid); | |
212 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
213 | { | |
214 | free (name1); | |
215 | return name2; | |
216 | } | |
217 | else | |
218 | { | |
219 | free (name2); | |
220 | return name1; | |
221 | } | |
222 | } | |
223 | ||
224 | /* Return non-zero if HEADER is a 64-bit ELF file. */ | |
225 | ||
226 | static int | |
957f3f49 | 227 | elf_64_header_p (const Elf64_Ehdr *header) |
d0722149 DE |
228 | { |
229 | return (header->e_ident[EI_MAG0] == ELFMAG0 | |
230 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
231 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
232 | && header->e_ident[EI_MAG3] == ELFMAG3 | |
233 | && header->e_ident[EI_CLASS] == ELFCLASS64); | |
234 | } | |
235 | ||
236 | /* Return non-zero if FILE is a 64-bit ELF file, | |
237 | zero if the file is not a 64-bit ELF file, | |
238 | and -1 if the file is not accessible or doesn't exist. */ | |
239 | ||
240 | int | |
241 | elf_64_file_p (const char *file) | |
242 | { | |
957f3f49 | 243 | Elf64_Ehdr header; |
d0722149 DE |
244 | int fd; |
245 | ||
246 | fd = open (file, O_RDONLY); | |
247 | if (fd < 0) | |
248 | return -1; | |
249 | ||
250 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
251 | { | |
252 | close (fd); | |
253 | return 0; | |
254 | } | |
255 | close (fd); | |
256 | ||
257 | return elf_64_header_p (&header); | |
258 | } | |
259 | ||
bd99dc85 PA |
260 | static void |
261 | delete_lwp (struct lwp_info *lwp) | |
262 | { | |
263 | remove_thread (get_lwp_thread (lwp)); | |
264 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 265 | free (lwp->arch_private); |
bd99dc85 PA |
266 | free (lwp); |
267 | } | |
268 | ||
95954743 PA |
269 | /* Add a process to the common process list, and set its private |
270 | data. */ | |
271 | ||
272 | static struct process_info * | |
273 | linux_add_process (int pid, int attached) | |
274 | { | |
275 | struct process_info *proc; | |
276 | ||
277 | /* Is this the first process? If so, then set the arch. */ | |
278 | if (all_processes.head == NULL) | |
279 | new_inferior = 1; | |
280 | ||
281 | proc = add_process (pid, attached); | |
282 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
283 | ||
aa5ca48f DE |
284 | if (the_low_target.new_process != NULL) |
285 | proc->private->arch_private = the_low_target.new_process (); | |
286 | ||
95954743 PA |
287 | return proc; |
288 | } | |
289 | ||
07d4f67e DE |
290 | /* Wrapper function for waitpid which handles EINTR, and emulates |
291 | __WALL for systems where that is not available. */ | |
292 | ||
293 | static int | |
294 | my_waitpid (int pid, int *status, int flags) | |
295 | { | |
296 | int ret, out_errno; | |
297 | ||
298 | if (debug_threads) | |
299 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
300 | ||
301 | if (flags & __WALL) | |
302 | { | |
303 | sigset_t block_mask, org_mask, wake_mask; | |
304 | int wnohang; | |
305 | ||
306 | wnohang = (flags & WNOHANG) != 0; | |
307 | flags &= ~(__WALL | __WCLONE); | |
308 | flags |= WNOHANG; | |
309 | ||
310 | /* Block all signals while here. This avoids knowing about | |
311 | LinuxThread's signals. */ | |
312 | sigfillset (&block_mask); | |
313 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
314 | ||
315 | /* ... except during the sigsuspend below. */ | |
316 | sigemptyset (&wake_mask); | |
317 | ||
318 | while (1) | |
319 | { | |
320 | /* Since all signals are blocked, there's no need to check | |
321 | for EINTR here. */ | |
322 | ret = waitpid (pid, status, flags); | |
323 | out_errno = errno; | |
324 | ||
325 | if (ret == -1 && out_errno != ECHILD) | |
326 | break; | |
327 | else if (ret > 0) | |
328 | break; | |
329 | ||
330 | if (flags & __WCLONE) | |
331 | { | |
332 | /* We've tried both flavors now. If WNOHANG is set, | |
333 | there's nothing else to do, just bail out. */ | |
334 | if (wnohang) | |
335 | break; | |
336 | ||
337 | if (debug_threads) | |
338 | fprintf (stderr, "blocking\n"); | |
339 | ||
340 | /* Block waiting for signals. */ | |
341 | sigsuspend (&wake_mask); | |
342 | } | |
343 | ||
344 | flags ^= __WCLONE; | |
345 | } | |
346 | ||
347 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
348 | } | |
349 | else | |
350 | { | |
351 | do | |
352 | ret = waitpid (pid, status, flags); | |
353 | while (ret == -1 && errno == EINTR); | |
354 | out_errno = errno; | |
355 | } | |
356 | ||
357 | if (debug_threads) | |
358 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
359 | pid, flags, status ? *status : -1, ret); | |
360 | ||
361 | errno = out_errno; | |
362 | return ret; | |
363 | } | |
364 | ||
bd99dc85 PA |
365 | /* Handle a GNU/Linux extended wait response. If we see a clone |
366 | event, we need to add the new LWP to our list (and not report the | |
367 | trap to higher layers). */ | |
0d62e5e8 | 368 | |
24a09b5f | 369 | static void |
54a0b537 | 370 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
371 | { |
372 | int event = wstat >> 16; | |
54a0b537 | 373 | struct lwp_info *new_lwp; |
24a09b5f DJ |
374 | |
375 | if (event == PTRACE_EVENT_CLONE) | |
376 | { | |
95954743 | 377 | ptid_t ptid; |
24a09b5f | 378 | unsigned long new_pid; |
836acd6d | 379 | int ret, status = W_STOPCODE (SIGSTOP); |
24a09b5f | 380 | |
bd99dc85 | 381 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid); |
24a09b5f DJ |
382 | |
383 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
384 | if (! pull_pid_from_list (&stopped_pids, new_pid)) | |
385 | { | |
386 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
387 | hits the SIGSTOP, but we're already attached. */ | |
388 | ||
97438e3f | 389 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
390 | |
391 | if (ret == -1) | |
392 | perror_with_name ("waiting for new child"); | |
393 | else if (ret != new_pid) | |
394 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 395 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
396 | warning ("wait returned unexpected status 0x%x", status); |
397 | } | |
398 | ||
14ce3065 | 399 | ptrace (PTRACE_SETOPTIONS, new_pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); |
24a09b5f | 400 | |
95954743 PA |
401 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
402 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
403 | add_thread (ptid, new_lwp); | |
24a09b5f | 404 | |
e27d73f6 DE |
405 | /* Either we're going to immediately resume the new thread |
406 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
407 | thinks the thread is currently running, so set this first | |
408 | before calling linux_resume_one_lwp. */ | |
409 | new_lwp->stopped = 1; | |
410 | ||
da5898ce DJ |
411 | /* Normally we will get the pending SIGSTOP. But in some cases |
412 | we might get another signal delivered to the group first. | |
f21cc1a2 | 413 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
414 | if (WSTOPSIG (status) == SIGSTOP) |
415 | { | |
d50171e4 PA |
416 | if (stopping_threads) |
417 | new_lwp->stop_pc = get_stop_pc (new_lwp); | |
418 | else | |
e27d73f6 | 419 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 420 | } |
24a09b5f | 421 | else |
da5898ce | 422 | { |
54a0b537 | 423 | new_lwp->stop_expected = 1; |
d50171e4 | 424 | |
da5898ce DJ |
425 | if (stopping_threads) |
426 | { | |
d50171e4 | 427 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
428 | new_lwp->status_pending_p = 1; |
429 | new_lwp->status_pending = status; | |
da5898ce DJ |
430 | } |
431 | else | |
432 | /* Pass the signal on. This is what GDB does - except | |
433 | shouldn't we really report it instead? */ | |
e27d73f6 | 434 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 435 | } |
24a09b5f DJ |
436 | |
437 | /* Always resume the current thread. If we are stopping | |
438 | threads, it will have a pending SIGSTOP; we may as well | |
439 | collect it now. */ | |
2acc282a | 440 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
441 | } |
442 | } | |
443 | ||
d50171e4 PA |
444 | /* Return the PC as read from the regcache of LWP, without any |
445 | adjustment. */ | |
446 | ||
447 | static CORE_ADDR | |
448 | get_pc (struct lwp_info *lwp) | |
449 | { | |
450 | struct thread_info *saved_inferior; | |
451 | struct regcache *regcache; | |
452 | CORE_ADDR pc; | |
453 | ||
454 | if (the_low_target.get_pc == NULL) | |
455 | return 0; | |
456 | ||
457 | saved_inferior = current_inferior; | |
458 | current_inferior = get_lwp_thread (lwp); | |
459 | ||
460 | regcache = get_thread_regcache (current_inferior, 1); | |
461 | pc = (*the_low_target.get_pc) (regcache); | |
462 | ||
463 | if (debug_threads) | |
464 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
465 | ||
466 | current_inferior = saved_inferior; | |
467 | return pc; | |
468 | } | |
469 | ||
470 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
471 | The SIGTRAP could mean several things. |
472 | ||
473 | On i386, where decr_pc_after_break is non-zero: | |
474 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
475 | we will get only the one SIGTRAP (even if the instruction we | |
476 | stepped over was a breakpoint). The value of $eip will be the | |
477 | next instruction. | |
478 | If we continue the process using PTRACE_CONT, we will get a | |
479 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
480 | the instruction after the breakpoint (i.e. needs to be | |
481 | decremented). If we report the SIGTRAP to GDB, we must also | |
482 | report the undecremented PC. If we cancel the SIGTRAP, we | |
483 | must resume at the decremented PC. | |
484 | ||
485 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
486 | with hardware or kernel single-step: | |
487 | If we single-step over a breakpoint instruction, our PC will | |
488 | point at the following instruction. If we continue and hit a | |
489 | breakpoint instruction, our PC will point at the breakpoint | |
490 | instruction. */ | |
491 | ||
492 | static CORE_ADDR | |
d50171e4 | 493 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 494 | { |
d50171e4 PA |
495 | CORE_ADDR stop_pc; |
496 | ||
497 | if (the_low_target.get_pc == NULL) | |
498 | return 0; | |
0d62e5e8 | 499 | |
d50171e4 PA |
500 | stop_pc = get_pc (lwp); |
501 | ||
bdabb078 PA |
502 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
503 | && !lwp->stepping | |
504 | && !lwp->stopped_by_watchpoint | |
505 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
506 | stop_pc -= the_low_target.decr_pc_after_break; |
507 | ||
508 | if (debug_threads) | |
509 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
510 | ||
511 | return stop_pc; | |
0d62e5e8 | 512 | } |
ce3a066d | 513 | |
0d62e5e8 | 514 | static void * |
95954743 | 515 | add_lwp (ptid_t ptid) |
611cb4a5 | 516 | { |
54a0b537 | 517 | struct lwp_info *lwp; |
0d62e5e8 | 518 | |
54a0b537 PA |
519 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
520 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 521 | |
95954743 | 522 | lwp->head.id = ptid; |
0d62e5e8 | 523 | |
aa5ca48f DE |
524 | if (the_low_target.new_thread != NULL) |
525 | lwp->arch_private = the_low_target.new_thread (); | |
526 | ||
54a0b537 | 527 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 528 | |
54a0b537 | 529 | return lwp; |
0d62e5e8 | 530 | } |
611cb4a5 | 531 | |
da6d8c04 DJ |
532 | /* Start an inferior process and returns its pid. |
533 | ALLARGS is a vector of program-name and args. */ | |
534 | ||
ce3a066d DJ |
535 | static int |
536 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 537 | { |
a6dbe5df | 538 | struct lwp_info *new_lwp; |
da6d8c04 | 539 | int pid; |
95954743 | 540 | ptid_t ptid; |
da6d8c04 | 541 | |
42c81e2a | 542 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
543 | pid = vfork (); |
544 | #else | |
da6d8c04 | 545 | pid = fork (); |
52fb6437 | 546 | #endif |
da6d8c04 DJ |
547 | if (pid < 0) |
548 | perror_with_name ("fork"); | |
549 | ||
550 | if (pid == 0) | |
551 | { | |
552 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
553 | ||
60c3d7b0 | 554 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 555 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 556 | #endif |
0d62e5e8 | 557 | |
a9fa9f7d DJ |
558 | setpgid (0, 0); |
559 | ||
2b876972 DJ |
560 | execv (program, allargs); |
561 | if (errno == ENOENT) | |
562 | execvp (program, allargs); | |
da6d8c04 DJ |
563 | |
564 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 565 | strerror (errno)); |
da6d8c04 DJ |
566 | fflush (stderr); |
567 | _exit (0177); | |
568 | } | |
569 | ||
95954743 PA |
570 | linux_add_process (pid, 0); |
571 | ||
572 | ptid = ptid_build (pid, pid, 0); | |
573 | new_lwp = add_lwp (ptid); | |
574 | add_thread (ptid, new_lwp); | |
a6dbe5df | 575 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 576 | |
a9fa9f7d | 577 | return pid; |
da6d8c04 DJ |
578 | } |
579 | ||
580 | /* Attach to an inferior process. */ | |
581 | ||
95954743 PA |
582 | static void |
583 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 584 | { |
95954743 | 585 | ptid_t ptid; |
54a0b537 | 586 | struct lwp_info *new_lwp; |
611cb4a5 | 587 | |
95954743 | 588 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0) |
da6d8c04 | 589 | { |
95954743 | 590 | if (!initial) |
2d717e4f DJ |
591 | { |
592 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 593 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
594 | strerror (errno), errno); |
595 | fflush (stderr); | |
596 | return; | |
597 | } | |
598 | else | |
599 | /* If we fail to attach to a process, report an error. */ | |
95954743 | 600 | error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
43d5792c | 601 | strerror (errno), errno); |
da6d8c04 DJ |
602 | } |
603 | ||
95954743 PA |
604 | if (initial) |
605 | /* NOTE/FIXME: This lwp might have not been the tgid. */ | |
606 | ptid = ptid_build (lwpid, lwpid, 0); | |
607 | else | |
608 | { | |
609 | /* Note that extracting the pid from the current inferior is | |
610 | safe, since we're always called in the context of the same | |
611 | process as this new thread. */ | |
612 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
613 | ptid = ptid_build (pid, lwpid, 0); | |
614 | } | |
24a09b5f | 615 | |
95954743 PA |
616 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
617 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 618 | |
a6dbe5df PA |
619 | /* We need to wait for SIGSTOP before being able to make the next |
620 | ptrace call on this LWP. */ | |
621 | new_lwp->must_set_ptrace_flags = 1; | |
622 | ||
0d62e5e8 | 623 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
624 | brings it to a halt. |
625 | ||
626 | There are several cases to consider here: | |
627 | ||
628 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 629 | of a new thread that is being created. |
d50171e4 PA |
630 | In this case we should ignore that SIGSTOP and resume the |
631 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 632 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 633 | resume_continue. |
0e21c1ec DE |
634 | |
635 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
636 | to it via attach_inferior. |
637 | In this case we want the process thread to stop. | |
d50171e4 PA |
638 | This is handled by having linux_attach set last_resume_kind == |
639 | resume_stop after we return. | |
1b3f6016 PA |
640 | ??? If the process already has several threads we leave the other |
641 | threads running. | |
0e21c1ec DE |
642 | |
643 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
644 | existing threads. |
645 | In this case we want the thread to stop. | |
646 | FIXME: This case is currently not properly handled. | |
647 | We should wait for the SIGSTOP but don't. Things work apparently | |
648 | because enough time passes between when we ptrace (ATTACH) and when | |
649 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
650 | |
651 | On the other hand, if we are currently trying to stop all threads, we | |
652 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 653 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
654 | end of the list, and so the new thread has not yet reached |
655 | wait_for_sigstop (but will). */ | |
d50171e4 | 656 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
657 | } |
658 | ||
95954743 PA |
659 | void |
660 | linux_attach_lwp (unsigned long lwpid) | |
661 | { | |
662 | linux_attach_lwp_1 (lwpid, 0); | |
663 | } | |
664 | ||
0d62e5e8 | 665 | int |
a1928bad | 666 | linux_attach (unsigned long pid) |
0d62e5e8 | 667 | { |
95954743 | 668 | linux_attach_lwp_1 (pid, 1); |
95954743 | 669 | linux_add_process (pid, 1); |
0d62e5e8 | 670 | |
bd99dc85 PA |
671 | if (!non_stop) |
672 | { | |
8336d594 PA |
673 | struct thread_info *thread; |
674 | ||
675 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
676 | process. It will be collected by wait shortly. */ | |
677 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
678 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 679 | } |
0d62e5e8 | 680 | |
95954743 PA |
681 | return 0; |
682 | } | |
683 | ||
684 | struct counter | |
685 | { | |
686 | int pid; | |
687 | int count; | |
688 | }; | |
689 | ||
690 | static int | |
691 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
692 | { | |
693 | struct counter *counter = args; | |
694 | ||
695 | if (ptid_get_pid (entry->id) == counter->pid) | |
696 | { | |
697 | if (++counter->count > 1) | |
698 | return 1; | |
699 | } | |
d61ddec4 | 700 | |
da6d8c04 DJ |
701 | return 0; |
702 | } | |
703 | ||
95954743 PA |
704 | static int |
705 | last_thread_of_process_p (struct thread_info *thread) | |
706 | { | |
707 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
708 | int pid = ptid_get_pid (ptid); | |
709 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 710 | |
95954743 PA |
711 | return (find_inferior (&all_threads, |
712 | second_thread_of_pid_p, &counter) == NULL); | |
713 | } | |
714 | ||
715 | /* Kill the inferior lwp. */ | |
716 | ||
717 | static int | |
718 | linux_kill_one_lwp (struct inferior_list_entry *entry, void *args) | |
da6d8c04 | 719 | { |
0d62e5e8 | 720 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 721 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 722 | int wstat; |
95954743 PA |
723 | int pid = * (int *) args; |
724 | ||
725 | if (ptid_get_pid (entry->id) != pid) | |
726 | return 0; | |
0d62e5e8 | 727 | |
fd500816 DJ |
728 | /* We avoid killing the first thread here, because of a Linux kernel (at |
729 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
730 | the children get a chance to be reaped, it will remain a zombie | |
731 | forever. */ | |
95954743 | 732 | |
12b42a12 | 733 | if (lwpid_of (lwp) == pid) |
95954743 PA |
734 | { |
735 | if (debug_threads) | |
736 | fprintf (stderr, "lkop: is last of process %s\n", | |
737 | target_pid_to_str (entry->id)); | |
738 | return 0; | |
739 | } | |
fd500816 | 740 | |
bd99dc85 PA |
741 | /* If we're killing a running inferior, make sure it is stopped |
742 | first, as PTRACE_KILL will not work otherwise. */ | |
743 | if (!lwp->stopped) | |
744 | send_sigstop (&lwp->head); | |
745 | ||
0d62e5e8 DJ |
746 | do |
747 | { | |
bd99dc85 | 748 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
0d62e5e8 DJ |
749 | |
750 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 751 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 752 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
753 | |
754 | return 0; | |
da6d8c04 DJ |
755 | } |
756 | ||
95954743 PA |
757 | static int |
758 | linux_kill (int pid) | |
0d62e5e8 | 759 | { |
95954743 | 760 | struct process_info *process; |
54a0b537 | 761 | struct lwp_info *lwp; |
95954743 | 762 | struct thread_info *thread; |
fd500816 | 763 | int wstat; |
95954743 | 764 | int lwpid; |
fd500816 | 765 | |
95954743 PA |
766 | process = find_process_pid (pid); |
767 | if (process == NULL) | |
768 | return -1; | |
9d606399 | 769 | |
95954743 | 770 | find_inferior (&all_threads, linux_kill_one_lwp, &pid); |
fd500816 | 771 | |
54a0b537 | 772 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 773 | thread in the list, so do so now. */ |
95954743 PA |
774 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
775 | thread = get_lwp_thread (lwp); | |
bd99dc85 PA |
776 | |
777 | if (debug_threads) | |
95954743 PA |
778 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", |
779 | lwpid_of (lwp), pid); | |
bd99dc85 PA |
780 | |
781 | /* If we're killing a running inferior, make sure it is stopped | |
782 | first, as PTRACE_KILL will not work otherwise. */ | |
783 | if (!lwp->stopped) | |
784 | send_sigstop (&lwp->head); | |
785 | ||
fd500816 DJ |
786 | do |
787 | { | |
bd99dc85 | 788 | ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0); |
fd500816 DJ |
789 | |
790 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 PA |
791 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
792 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
2d717e4f | 793 | |
bd99dc85 | 794 | delete_lwp (lwp); |
8336d594 PA |
795 | |
796 | the_target->mourn (process); | |
95954743 | 797 | return 0; |
0d62e5e8 DJ |
798 | } |
799 | ||
95954743 PA |
800 | static int |
801 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
802 | { |
803 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 804 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
805 | int pid = * (int *) args; |
806 | ||
807 | if (ptid_get_pid (entry->id) != pid) | |
808 | return 0; | |
6ad8ae5c | 809 | |
bd99dc85 PA |
810 | /* If we're detaching from a running inferior, make sure it is |
811 | stopped first, as PTRACE_DETACH will not work otherwise. */ | |
812 | if (!lwp->stopped) | |
813 | { | |
95954743 | 814 | int lwpid = lwpid_of (lwp); |
bd99dc85 PA |
815 | |
816 | stopping_threads = 1; | |
817 | send_sigstop (&lwp->head); | |
818 | ||
819 | /* If this detects a new thread through a clone event, the new | |
820 | thread is appended to the end of the lwp list, so we'll | |
821 | eventually detach from it. */ | |
822 | wait_for_sigstop (&lwp->head); | |
823 | stopping_threads = 0; | |
824 | ||
825 | /* If LWP exits while we're trying to stop it, there's nothing | |
826 | left to do. */ | |
95954743 | 827 | lwp = find_lwp_pid (pid_to_ptid (lwpid)); |
bd99dc85 | 828 | if (lwp == NULL) |
95954743 | 829 | return 0; |
bd99dc85 PA |
830 | } |
831 | ||
ae13219e DJ |
832 | /* If this process is stopped but is expecting a SIGSTOP, then make |
833 | sure we take care of that now. This isn't absolutely guaranteed | |
834 | to collect the SIGSTOP, but is fairly likely to. */ | |
54a0b537 | 835 | if (lwp->stop_expected) |
ae13219e | 836 | { |
bd99dc85 | 837 | int wstat; |
ae13219e | 838 | /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
54a0b537 PA |
839 | lwp->stop_expected = 0; |
840 | if (lwp->stopped) | |
2acc282a | 841 | linux_resume_one_lwp (lwp, 0, 0, NULL); |
95954743 | 842 | linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
ae13219e DJ |
843 | } |
844 | ||
845 | /* Flush any pending changes to the process's registers. */ | |
846 | regcache_invalidate_one ((struct inferior_list_entry *) | |
54a0b537 | 847 | get_lwp_thread (lwp)); |
ae13219e DJ |
848 | |
849 | /* Finally, let it resume. */ | |
bd99dc85 PA |
850 | ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); |
851 | ||
852 | delete_lwp (lwp); | |
95954743 | 853 | return 0; |
6ad8ae5c DJ |
854 | } |
855 | ||
dd6953e1 | 856 | static int |
95954743 | 857 | any_thread_of (struct inferior_list_entry *entry, void *args) |
6ad8ae5c | 858 | { |
95954743 PA |
859 | int *pid_p = args; |
860 | ||
861 | if (ptid_get_pid (entry->id) == *pid_p) | |
862 | return 1; | |
863 | ||
864 | return 0; | |
865 | } | |
866 | ||
867 | static int | |
868 | linux_detach (int pid) | |
869 | { | |
870 | struct process_info *process; | |
871 | ||
872 | process = find_process_pid (pid); | |
873 | if (process == NULL) | |
874 | return -1; | |
875 | ||
ca5c370d | 876 | #ifdef USE_THREAD_DB |
8336d594 | 877 | thread_db_detach (process); |
ca5c370d PA |
878 | #endif |
879 | ||
95954743 PA |
880 | current_inferior = |
881 | (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid); | |
882 | ||
ae13219e | 883 | delete_all_breakpoints (); |
95954743 | 884 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
885 | |
886 | the_target->mourn (process); | |
dd6953e1 | 887 | return 0; |
6ad8ae5c DJ |
888 | } |
889 | ||
8336d594 PA |
890 | static void |
891 | linux_mourn (struct process_info *process) | |
892 | { | |
893 | struct process_info_private *priv; | |
894 | ||
895 | #ifdef USE_THREAD_DB | |
896 | thread_db_mourn (process); | |
897 | #endif | |
898 | ||
899 | /* Freeing all private data. */ | |
900 | priv = process->private; | |
901 | free (priv->arch_private); | |
902 | free (priv); | |
903 | process->private = NULL; | |
904 | } | |
905 | ||
444d6139 | 906 | static void |
95954743 | 907 | linux_join (int pid) |
444d6139 | 908 | { |
444d6139 | 909 | int status, ret; |
95954743 | 910 | struct process_info *process; |
bd99dc85 | 911 | |
95954743 PA |
912 | process = find_process_pid (pid); |
913 | if (process == NULL) | |
914 | return; | |
444d6139 PA |
915 | |
916 | do { | |
95954743 | 917 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
918 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
919 | break; | |
920 | } while (ret != -1 || errno != ECHILD); | |
921 | } | |
922 | ||
6ad8ae5c | 923 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 924 | static int |
95954743 | 925 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 926 | { |
95954743 PA |
927 | struct lwp_info *lwp = find_lwp_pid (ptid); |
928 | ||
929 | /* We assume we always know if a thread exits. If a whole process | |
930 | exited but we still haven't been able to report it to GDB, we'll | |
931 | hold on to the last lwp of the dead process. */ | |
932 | if (lwp != NULL) | |
933 | return !lwp->dead; | |
0d62e5e8 DJ |
934 | else |
935 | return 0; | |
936 | } | |
937 | ||
6bf5e0ba | 938 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 939 | static int |
d50171e4 | 940 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 941 | { |
54a0b537 | 942 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 943 | ptid_t ptid = * (ptid_t *) arg; |
d50171e4 | 944 | struct thread_info *thread = get_lwp_thread (lwp); |
95954743 PA |
945 | |
946 | /* Check if we're only interested in events from a specific process | |
947 | or its lwps. */ | |
948 | if (!ptid_equal (minus_one_ptid, ptid) | |
949 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
950 | return 0; | |
0d62e5e8 | 951 | |
d50171e4 PA |
952 | thread = get_lwp_thread (lwp); |
953 | ||
954 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
955 | report any status pending the LWP may have. */ | |
8336d594 | 956 | if (thread->last_resume_kind == resume_stop |
d50171e4 PA |
957 | && thread->last_status.kind == TARGET_WAITKIND_STOPPED) |
958 | return 0; | |
0d62e5e8 | 959 | |
d50171e4 | 960 | return lwp->status_pending_p; |
0d62e5e8 DJ |
961 | } |
962 | ||
95954743 PA |
963 | static int |
964 | same_lwp (struct inferior_list_entry *entry, void *data) | |
965 | { | |
966 | ptid_t ptid = *(ptid_t *) data; | |
967 | int lwp; | |
968 | ||
969 | if (ptid_get_lwp (ptid) != 0) | |
970 | lwp = ptid_get_lwp (ptid); | |
971 | else | |
972 | lwp = ptid_get_pid (ptid); | |
973 | ||
974 | if (ptid_get_lwp (entry->id) == lwp) | |
975 | return 1; | |
976 | ||
977 | return 0; | |
978 | } | |
979 | ||
980 | struct lwp_info * | |
981 | find_lwp_pid (ptid_t ptid) | |
982 | { | |
983 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
984 | } | |
985 | ||
bd99dc85 | 986 | static struct lwp_info * |
95954743 | 987 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 988 | { |
0d62e5e8 | 989 | int ret; |
95954743 | 990 | int to_wait_for = -1; |
bd99dc85 | 991 | struct lwp_info *child = NULL; |
0d62e5e8 | 992 | |
bd99dc85 | 993 | if (debug_threads) |
95954743 PA |
994 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
995 | ||
996 | if (ptid_equal (ptid, minus_one_ptid)) | |
997 | to_wait_for = -1; /* any child */ | |
998 | else | |
999 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1000 | |
bd99dc85 | 1001 | options |= __WALL; |
0d62e5e8 | 1002 | |
bd99dc85 | 1003 | retry: |
0d62e5e8 | 1004 | |
bd99dc85 PA |
1005 | ret = my_waitpid (to_wait_for, wstatp, options); |
1006 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1007 | return NULL; | |
1008 | else if (ret == -1) | |
1009 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1010 | |
1011 | if (debug_threads | |
1012 | && (!WIFSTOPPED (*wstatp) | |
1013 | || (WSTOPSIG (*wstatp) != 32 | |
1014 | && WSTOPSIG (*wstatp) != 33))) | |
1015 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1016 | ||
95954743 | 1017 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1018 | |
24a09b5f DJ |
1019 | /* If we didn't find a process, one of two things presumably happened: |
1020 | - A process we started and then detached from has exited. Ignore it. | |
1021 | - A process we are controlling has forked and the new child's stop | |
1022 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1023 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f DJ |
1024 | { |
1025 | add_pid_to_list (&stopped_pids, ret); | |
1026 | goto retry; | |
1027 | } | |
bd99dc85 | 1028 | else if (child == NULL) |
24a09b5f DJ |
1029 | goto retry; |
1030 | ||
bd99dc85 | 1031 | child->stopped = 1; |
0d62e5e8 | 1032 | |
bd99dc85 | 1033 | child->last_status = *wstatp; |
32ca6d61 | 1034 | |
d61ddec4 UW |
1035 | /* Architecture-specific setup after inferior is running. |
1036 | This needs to happen after we have attached to the inferior | |
1037 | and it is stopped for the first time, but before we access | |
1038 | any inferior registers. */ | |
1039 | if (new_inferior) | |
1040 | { | |
1041 | the_low_target.arch_setup (); | |
52fa2412 UW |
1042 | #ifdef HAVE_LINUX_REGSETS |
1043 | memset (disabled_regsets, 0, num_regsets); | |
1044 | #endif | |
d61ddec4 UW |
1045 | new_inferior = 0; |
1046 | } | |
1047 | ||
c3adc08c PA |
1048 | /* Fetch the possibly triggered data watchpoint info and store it in |
1049 | CHILD. | |
1050 | ||
1051 | On some archs, like x86, that use debug registers to set | |
1052 | watchpoints, it's possible that the way to know which watched | |
1053 | address trapped, is to check the register that is used to select | |
1054 | which address to watch. Problem is, between setting the | |
1055 | watchpoint and reading back which data address trapped, the user | |
1056 | may change the set of watchpoints, and, as a consequence, GDB | |
1057 | changes the debug registers in the inferior. To avoid reading | |
1058 | back a stale stopped-data-address when that happens, we cache in | |
1059 | LP the fact that a watchpoint trapped, and the corresponding data | |
1060 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1061 | changes the debug registers meanwhile, we have the cached data we | |
1062 | can rely on. */ | |
1063 | ||
1064 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1065 | { | |
1066 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1067 | { | |
1068 | child->stopped_by_watchpoint = 0; | |
1069 | } | |
1070 | else | |
1071 | { | |
1072 | struct thread_info *saved_inferior; | |
1073 | ||
1074 | saved_inferior = current_inferior; | |
1075 | current_inferior = get_lwp_thread (child); | |
1076 | ||
1077 | child->stopped_by_watchpoint | |
1078 | = the_low_target.stopped_by_watchpoint (); | |
1079 | ||
1080 | if (child->stopped_by_watchpoint) | |
1081 | { | |
1082 | if (the_low_target.stopped_data_address != NULL) | |
1083 | child->stopped_data_address | |
1084 | = the_low_target.stopped_data_address (); | |
1085 | else | |
1086 | child->stopped_data_address = 0; | |
1087 | } | |
1088 | ||
1089 | current_inferior = saved_inferior; | |
1090 | } | |
1091 | } | |
1092 | ||
d50171e4 PA |
1093 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1094 | architecture being defined already (so that CHILD has a valid | |
1095 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1096 | not). */ | |
1097 | if (WIFSTOPPED (*wstatp)) | |
1098 | child->stop_pc = get_stop_pc (child); | |
1099 | ||
0d62e5e8 | 1100 | if (debug_threads |
47c0c975 DE |
1101 | && WIFSTOPPED (*wstatp) |
1102 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1103 | { |
896c7fbb | 1104 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1105 | struct regcache *regcache; |
47c0c975 DE |
1106 | CORE_ADDR pc; |
1107 | ||
d50171e4 | 1108 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1109 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1110 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1111 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1112 | current_inferior = saved_inferior; |
0d62e5e8 | 1113 | } |
bd99dc85 PA |
1114 | |
1115 | return child; | |
0d62e5e8 | 1116 | } |
611cb4a5 | 1117 | |
219f2f23 PA |
1118 | /* This function should only be called if the LWP got a SIGTRAP. |
1119 | ||
1120 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1121 | event was handled, 0 otherwise. */ | |
1122 | ||
1123 | static int | |
1124 | handle_tracepoints (struct lwp_info *lwp) | |
1125 | { | |
1126 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1127 | int tpoint_related_event = 0; | |
1128 | ||
1129 | /* And we need to be sure that any all-threads-stopping doesn't try | |
1130 | to move threads out of the jump pads, as it could deadlock the | |
1131 | inferior (LWP could be in the jump pad, maybe even holding the | |
1132 | lock.) */ | |
1133 | ||
1134 | /* Do any necessary step collect actions. */ | |
1135 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1136 | ||
1137 | /* See if we just hit a tracepoint and do its main collect | |
1138 | actions. */ | |
1139 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1140 | ||
1141 | if (tpoint_related_event) | |
1142 | { | |
1143 | if (debug_threads) | |
1144 | fprintf (stderr, "got a tracepoint event\n"); | |
1145 | return 1; | |
1146 | } | |
1147 | ||
1148 | return 0; | |
1149 | } | |
1150 | ||
d50171e4 PA |
1151 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1152 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1153 | will handle the current event, eventually we will resume this LWP, | |
1154 | and this breakpoint will trap again. */ | |
1155 | ||
1156 | static int | |
1157 | cancel_breakpoint (struct lwp_info *lwp) | |
1158 | { | |
1159 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1160 | |
1161 | /* There's nothing to do if we don't support breakpoints. */ | |
1162 | if (!supports_breakpoints ()) | |
1163 | return 0; | |
1164 | ||
d50171e4 PA |
1165 | /* breakpoint_at reads from current inferior. */ |
1166 | saved_inferior = current_inferior; | |
1167 | current_inferior = get_lwp_thread (lwp); | |
1168 | ||
1169 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1170 | { | |
1171 | if (debug_threads) | |
1172 | fprintf (stderr, | |
1173 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1174 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1175 | |
1176 | /* Back up the PC if necessary. */ | |
1177 | if (the_low_target.decr_pc_after_break) | |
1178 | { | |
1179 | struct regcache *regcache | |
fc7238bb | 1180 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1181 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1182 | } | |
1183 | ||
1184 | current_inferior = saved_inferior; | |
1185 | return 1; | |
1186 | } | |
1187 | else | |
1188 | { | |
1189 | if (debug_threads) | |
1190 | fprintf (stderr, | |
1191 | "CB: No breakpoint found at %s for [%s]\n", | |
1192 | paddress (lwp->stop_pc), | |
fc7238bb | 1193 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1194 | } |
1195 | ||
1196 | current_inferior = saved_inferior; | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | /* When the event-loop is doing a step-over, this points at the thread | |
1201 | being stepped. */ | |
1202 | ptid_t step_over_bkpt; | |
1203 | ||
bd99dc85 PA |
1204 | /* Wait for an event from child PID. If PID is -1, wait for any |
1205 | child. Store the stop status through the status pointer WSTAT. | |
1206 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1207 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1208 | the stopped child otherwise. */ | |
1209 | ||
0d62e5e8 | 1210 | static int |
95954743 | 1211 | linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1212 | { |
d50171e4 PA |
1213 | struct lwp_info *event_child, *requested_child; |
1214 | ||
d50171e4 PA |
1215 | event_child = NULL; |
1216 | requested_child = NULL; | |
0d62e5e8 | 1217 | |
95954743 | 1218 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1219 | |
95954743 PA |
1220 | if (ptid_equal (ptid, minus_one_ptid) |
1221 | || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid)) | |
0d62e5e8 | 1222 | { |
54a0b537 | 1223 | event_child = (struct lwp_info *) |
d50171e4 | 1224 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1225 | if (debug_threads && event_child) |
bd99dc85 | 1226 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1227 | } |
1228 | else | |
1229 | { | |
95954743 | 1230 | requested_child = find_lwp_pid (ptid); |
d50171e4 PA |
1231 | |
1232 | if (requested_child->status_pending_p) | |
bd99dc85 | 1233 | event_child = requested_child; |
0d62e5e8 | 1234 | } |
611cb4a5 | 1235 | |
0d62e5e8 DJ |
1236 | if (event_child != NULL) |
1237 | { | |
bd99dc85 PA |
1238 | if (debug_threads) |
1239 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1240 | lwpid_of (event_child), event_child->status_pending); | |
1241 | *wstat = event_child->status_pending; | |
1242 | event_child->status_pending_p = 0; | |
1243 | event_child->status_pending = 0; | |
1244 | current_inferior = get_lwp_thread (event_child); | |
1245 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1246 | } |
1247 | ||
1248 | /* We only enter this loop if no process has a pending wait status. Thus | |
1249 | any action taken in response to a wait status inside this loop is | |
1250 | responding as soon as we detect the status, not after any pending | |
1251 | events. */ | |
1252 | while (1) | |
1253 | { | |
6bf5e0ba | 1254 | event_child = linux_wait_for_lwp (ptid, wstat, options); |
0d62e5e8 | 1255 | |
bd99dc85 | 1256 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1257 | { |
1258 | if (debug_threads) | |
1259 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1260 | return 0; | |
1261 | } | |
0d62e5e8 DJ |
1262 | |
1263 | if (event_child == NULL) | |
1264 | error ("event from unknown child"); | |
611cb4a5 | 1265 | |
bd99dc85 | 1266 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1267 | |
89be2091 | 1268 | /* Check for thread exit. */ |
bd99dc85 | 1269 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1270 | { |
89be2091 | 1271 | if (debug_threads) |
95954743 | 1272 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1273 | |
1274 | /* If the last thread is exiting, just return. */ | |
95954743 | 1275 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1276 | { |
1277 | if (debug_threads) | |
95954743 PA |
1278 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1279 | lwpid_of (event_child)); | |
bd99dc85 PA |
1280 | return lwpid_of (event_child); |
1281 | } | |
89be2091 | 1282 | |
bd99dc85 PA |
1283 | if (!non_stop) |
1284 | { | |
1285 | current_inferior = (struct thread_info *) all_threads.head; | |
1286 | if (debug_threads) | |
1287 | fprintf (stderr, "Current inferior is now %ld\n", | |
1288 | lwpid_of (get_thread_lwp (current_inferior))); | |
1289 | } | |
1290 | else | |
1291 | { | |
1292 | current_inferior = NULL; | |
1293 | if (debug_threads) | |
1294 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1295 | } | |
89be2091 DJ |
1296 | |
1297 | /* If we were waiting for this particular child to do something... | |
1298 | well, it did something. */ | |
bd99dc85 | 1299 | if (requested_child != NULL) |
d50171e4 PA |
1300 | { |
1301 | int lwpid = lwpid_of (event_child); | |
1302 | ||
1303 | /* Cancel the step-over operation --- the thread that | |
1304 | started it is gone. */ | |
1305 | if (finish_step_over (event_child)) | |
1306 | unstop_all_lwps (event_child); | |
1307 | delete_lwp (event_child); | |
1308 | return lwpid; | |
1309 | } | |
1310 | ||
1311 | delete_lwp (event_child); | |
89be2091 DJ |
1312 | |
1313 | /* Wait for a more interesting event. */ | |
1314 | continue; | |
1315 | } | |
1316 | ||
a6dbe5df PA |
1317 | if (event_child->must_set_ptrace_flags) |
1318 | { | |
1319 | ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child), | |
14ce3065 | 1320 | 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); |
a6dbe5df PA |
1321 | event_child->must_set_ptrace_flags = 0; |
1322 | } | |
1323 | ||
bd99dc85 PA |
1324 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1325 | && *wstat >> 16 != 0) | |
24a09b5f | 1326 | { |
bd99dc85 | 1327 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1328 | continue; |
1329 | } | |
1330 | ||
89be2091 DJ |
1331 | /* If GDB is not interested in this signal, don't stop other |
1332 | threads, and don't report it to GDB. Just resume the | |
1333 | inferior right away. We do this for threading-related | |
69f223ed DJ |
1334 | signals as well as any that GDB specifically requested we |
1335 | ignore. But never ignore SIGSTOP if we sent it ourselves, | |
1336 | and do not ignore signals when stepping - they may require | |
1337 | special handling to skip the signal handler. */ | |
89be2091 DJ |
1338 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
1339 | thread library? */ | |
bd99dc85 | 1340 | if (WIFSTOPPED (*wstat) |
69f223ed | 1341 | && !event_child->stepping |
24a09b5f | 1342 | && ( |
60c3d7b0 | 1343 | #if defined (USE_THREAD_DB) && defined (__SIGRTMIN) |
cdbfd419 | 1344 | (current_process ()->private->thread_db != NULL |
bd99dc85 PA |
1345 | && (WSTOPSIG (*wstat) == __SIGRTMIN |
1346 | || WSTOPSIG (*wstat) == __SIGRTMIN + 1)) | |
24a09b5f DJ |
1347 | || |
1348 | #endif | |
bd99dc85 | 1349 | (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))] |
d50171e4 PA |
1350 | && !(WSTOPSIG (*wstat) == SIGSTOP |
1351 | && event_child->stop_expected)))) | |
89be2091 DJ |
1352 | { |
1353 | siginfo_t info, *info_p; | |
1354 | ||
1355 | if (debug_threads) | |
24a09b5f | 1356 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", |
bd99dc85 | 1357 | WSTOPSIG (*wstat), lwpid_of (event_child)); |
89be2091 | 1358 | |
bd99dc85 | 1359 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0) |
89be2091 DJ |
1360 | info_p = &info; |
1361 | else | |
1362 | info_p = NULL; | |
d50171e4 | 1363 | linux_resume_one_lwp (event_child, event_child->stepping, |
bd99dc85 | 1364 | WSTOPSIG (*wstat), info_p); |
89be2091 | 1365 | continue; |
0d62e5e8 | 1366 | } |
611cb4a5 | 1367 | |
d50171e4 PA |
1368 | if (WIFSTOPPED (*wstat) |
1369 | && WSTOPSIG (*wstat) == SIGSTOP | |
1370 | && event_child->stop_expected) | |
1371 | { | |
1372 | int should_stop; | |
1373 | ||
1374 | if (debug_threads) | |
1375 | fprintf (stderr, "Expected stop.\n"); | |
1376 | event_child->stop_expected = 0; | |
1377 | ||
8336d594 | 1378 | should_stop = (current_inferior->last_resume_kind == resume_stop |
d50171e4 PA |
1379 | || stopping_threads); |
1380 | ||
1381 | if (!should_stop) | |
1382 | { | |
1383 | linux_resume_one_lwp (event_child, | |
1384 | event_child->stepping, 0, NULL); | |
1385 | continue; | |
1386 | } | |
1387 | } | |
1388 | ||
bd99dc85 | 1389 | return lwpid_of (event_child); |
611cb4a5 | 1390 | } |
0d62e5e8 | 1391 | |
611cb4a5 DJ |
1392 | /* NOTREACHED */ |
1393 | return 0; | |
1394 | } | |
1395 | ||
95954743 PA |
1396 | static int |
1397 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) | |
1398 | { | |
1399 | ptid_t wait_ptid; | |
1400 | ||
1401 | if (ptid_is_pid (ptid)) | |
1402 | { | |
1403 | /* A request to wait for a specific tgid. This is not possible | |
1404 | with waitpid, so instead, we wait for any child, and leave | |
1405 | children we're not interested in right now with a pending | |
1406 | status to report later. */ | |
1407 | wait_ptid = minus_one_ptid; | |
1408 | } | |
1409 | else | |
1410 | wait_ptid = ptid; | |
1411 | ||
1412 | while (1) | |
1413 | { | |
1414 | int event_pid; | |
1415 | ||
1416 | event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options); | |
1417 | ||
1418 | if (event_pid > 0 | |
1419 | && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid) | |
1420 | { | |
1421 | struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid)); | |
1422 | ||
1423 | if (! WIFSTOPPED (*wstat)) | |
1424 | mark_lwp_dead (event_child, *wstat); | |
1425 | else | |
1426 | { | |
1427 | event_child->status_pending_p = 1; | |
1428 | event_child->status_pending = *wstat; | |
1429 | } | |
1430 | } | |
1431 | else | |
1432 | return event_pid; | |
1433 | } | |
1434 | } | |
1435 | ||
6bf5e0ba PA |
1436 | |
1437 | /* Count the LWP's that have had events. */ | |
1438 | ||
1439 | static int | |
1440 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1441 | { | |
1442 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1443 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1444 | int *count = data; |
1445 | ||
1446 | gdb_assert (count != NULL); | |
1447 | ||
1448 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1449 | should be reported to GDB. */ | |
8336d594 PA |
1450 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1451 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
1452 | && lp->status_pending_p |
1453 | && WIFSTOPPED (lp->status_pending) | |
1454 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1455 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1456 | (*count)++; | |
1457 | ||
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1462 | ||
1463 | static int | |
1464 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1465 | { | |
1466 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1467 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 1468 | |
8336d594 PA |
1469 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1470 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
1471 | && lp->status_pending_p) |
1472 | return 1; | |
1473 | else | |
1474 | return 0; | |
1475 | } | |
1476 | ||
1477 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1478 | reported to GDB. */ | |
1479 | ||
1480 | static int | |
1481 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1482 | { | |
1483 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1484 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1485 | int *selector = data; |
1486 | ||
1487 | gdb_assert (selector != NULL); | |
1488 | ||
1489 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
1490 | if (thread->last_resume_kind != resume_stop |
1491 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1492 | && lp->status_pending_p |
1493 | && WIFSTOPPED (lp->status_pending) | |
1494 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1495 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1496 | if ((*selector)-- == 0) | |
1497 | return 1; | |
1498 | ||
1499 | return 0; | |
1500 | } | |
1501 | ||
1502 | static int | |
1503 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
1504 | { | |
1505 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1506 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1507 | struct lwp_info *event_lp = data; |
1508 | ||
1509 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
1510 | if (lp == event_lp) | |
1511 | return 0; | |
1512 | ||
1513 | /* If a LWP other than the LWP that we're reporting an event for has | |
1514 | hit a GDB breakpoint (as opposed to some random trap signal), | |
1515 | then just arrange for it to hit it again later. We don't keep | |
1516 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
1517 | LWP. We will handle the current event, eventually we will resume | |
1518 | all LWPs, and this one will get its breakpoint trap again. | |
1519 | ||
1520 | If we do not do this, then we run the risk that the user will | |
1521 | delete or disable the breakpoint, but the LWP will have already | |
1522 | tripped on it. */ | |
1523 | ||
8336d594 PA |
1524 | if (thread->last_resume_kind != resume_stop |
1525 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
1526 | && lp->status_pending_p |
1527 | && WIFSTOPPED (lp->status_pending) | |
1528 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
1529 | && !lp->stepping |
1530 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
1531 | && cancel_breakpoint (lp)) |
1532 | /* Throw away the SIGTRAP. */ | |
1533 | lp->status_pending_p = 0; | |
1534 | ||
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | /* Select one LWP out of those that have events pending. */ | |
1539 | ||
1540 | static void | |
1541 | select_event_lwp (struct lwp_info **orig_lp) | |
1542 | { | |
1543 | int num_events = 0; | |
1544 | int random_selector; | |
1545 | struct lwp_info *event_lp; | |
1546 | ||
1547 | /* Give preference to any LWP that is being single-stepped. */ | |
1548 | event_lp | |
1549 | = (struct lwp_info *) find_inferior (&all_lwps, | |
1550 | select_singlestep_lwp_callback, NULL); | |
1551 | if (event_lp != NULL) | |
1552 | { | |
1553 | if (debug_threads) | |
1554 | fprintf (stderr, | |
1555 | "SEL: Select single-step %s\n", | |
1556 | target_pid_to_str (ptid_of (event_lp))); | |
1557 | } | |
1558 | else | |
1559 | { | |
1560 | /* No single-stepping LWP. Select one at random, out of those | |
1561 | which have had SIGTRAP events. */ | |
1562 | ||
1563 | /* First see how many SIGTRAP events we have. */ | |
1564 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
1565 | ||
1566 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
1567 | random_selector = (int) | |
1568 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
1569 | ||
1570 | if (debug_threads && num_events > 1) | |
1571 | fprintf (stderr, | |
1572 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
1573 | num_events, random_selector); | |
1574 | ||
1575 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
1576 | select_event_lwp_callback, | |
1577 | &random_selector); | |
1578 | } | |
1579 | ||
1580 | if (event_lp != NULL) | |
1581 | { | |
1582 | /* Switch the event LWP. */ | |
1583 | *orig_lp = event_lp; | |
1584 | } | |
1585 | } | |
1586 | ||
d50171e4 PA |
1587 | /* Set this inferior LWP's state as "want-stopped". We won't resume |
1588 | this LWP until the client gives us another action for it. */ | |
1589 | ||
1590 | static void | |
1591 | gdb_wants_lwp_stopped (struct inferior_list_entry *entry) | |
1592 | { | |
1593 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1594 | struct thread_info *thread = get_lwp_thread (lwp); | |
1595 | ||
1596 | /* Most threads are stopped implicitly (all-stop); tag that with | |
1597 | signal 0. The thread being explicitly reported stopped to the | |
1598 | client, gets it's status fixed up afterwards. */ | |
1599 | thread->last_status.kind = TARGET_WAITKIND_STOPPED; | |
1600 | thread->last_status.value.sig = TARGET_SIGNAL_0; | |
1601 | ||
8336d594 | 1602 | thread->last_resume_kind = resume_stop; |
d50171e4 PA |
1603 | } |
1604 | ||
1605 | /* Set all LWP's states as "want-stopped". */ | |
1606 | ||
1607 | static void | |
1608 | gdb_wants_all_stopped (void) | |
1609 | { | |
1610 | for_each_inferior (&all_lwps, gdb_wants_lwp_stopped); | |
1611 | } | |
1612 | ||
0d62e5e8 | 1613 | /* Wait for process, returns status. */ |
da6d8c04 | 1614 | |
95954743 PA |
1615 | static ptid_t |
1616 | linux_wait_1 (ptid_t ptid, | |
1617 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 1618 | { |
e5f1222d | 1619 | int w; |
fc7238bb | 1620 | struct lwp_info *event_child; |
bd99dc85 | 1621 | int options; |
bd99dc85 | 1622 | int pid; |
6bf5e0ba PA |
1623 | int step_over_finished; |
1624 | int bp_explains_trap; | |
1625 | int maybe_internal_trap; | |
1626 | int report_to_gdb; | |
219f2f23 | 1627 | int trace_event; |
bd99dc85 PA |
1628 | |
1629 | /* Translate generic target options into linux options. */ | |
1630 | options = __WALL; | |
1631 | if (target_options & TARGET_WNOHANG) | |
1632 | options |= WNOHANG; | |
0d62e5e8 DJ |
1633 | |
1634 | retry: | |
bd99dc85 PA |
1635 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1636 | ||
0d62e5e8 DJ |
1637 | /* If we were only supposed to resume one thread, only wait for |
1638 | that thread - if it's still alive. If it died, however - which | |
1639 | can happen if we're coming from the thread death case below - | |
1640 | then we need to make sure we restart the other threads. We could | |
1641 | pick a thread at random or restart all; restarting all is less | |
1642 | arbitrary. */ | |
95954743 PA |
1643 | if (!non_stop |
1644 | && !ptid_equal (cont_thread, null_ptid) | |
1645 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 1646 | { |
fc7238bb PA |
1647 | struct thread_info *thread; |
1648 | ||
bd99dc85 PA |
1649 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
1650 | cont_thread); | |
0d62e5e8 DJ |
1651 | |
1652 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 1653 | if (thread == NULL) |
64386c31 DJ |
1654 | { |
1655 | struct thread_resume resume_info; | |
95954743 | 1656 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
1657 | resume_info.kind = resume_continue; |
1658 | resume_info.sig = 0; | |
2bd7c093 | 1659 | linux_resume (&resume_info, 1); |
64386c31 | 1660 | } |
bd99dc85 | 1661 | else |
95954743 | 1662 | ptid = cont_thread; |
0d62e5e8 | 1663 | } |
da6d8c04 | 1664 | |
6bf5e0ba PA |
1665 | if (ptid_equal (step_over_bkpt, null_ptid)) |
1666 | pid = linux_wait_for_event (ptid, &w, options); | |
1667 | else | |
1668 | { | |
1669 | if (debug_threads) | |
1670 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
1671 | target_pid_to_str (step_over_bkpt)); | |
1672 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
1673 | } | |
1674 | ||
bd99dc85 | 1675 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 1676 | return null_ptid; |
bd99dc85 | 1677 | |
6bf5e0ba | 1678 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 1679 | |
0d62e5e8 DJ |
1680 | /* If we are waiting for a particular child, and it exited, |
1681 | linux_wait_for_event will return its exit status. Similarly if | |
1682 | the last child exited. If this is not the last child, however, | |
1683 | do not report it as exited until there is a 'thread exited' response | |
1684 | available in the remote protocol. Instead, just wait for another event. | |
1685 | This should be safe, because if the thread crashed we will already | |
1686 | have reported the termination signal to GDB; that should stop any | |
1687 | in-progress stepping operations, etc. | |
1688 | ||
1689 | Report the exit status of the last thread to exit. This matches | |
1690 | LinuxThreads' behavior. */ | |
1691 | ||
95954743 | 1692 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 1693 | { |
bd99dc85 | 1694 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 1695 | { |
6bf5e0ba | 1696 | delete_lwp (event_child); |
5b1c542e | 1697 | |
bd99dc85 | 1698 | current_inferior = NULL; |
5b1c542e | 1699 | |
bd99dc85 PA |
1700 | if (WIFEXITED (w)) |
1701 | { | |
1702 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
1703 | ourstatus->value.integer = WEXITSTATUS (w); | |
1704 | ||
1705 | if (debug_threads) | |
1706 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
1707 | } | |
1708 | else | |
1709 | { | |
1710 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
1711 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (w)); | |
1712 | ||
1713 | if (debug_threads) | |
1714 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
1715 | ||
1716 | } | |
5b1c542e | 1717 | |
95954743 | 1718 | return pid_to_ptid (pid); |
0d62e5e8 | 1719 | } |
da6d8c04 | 1720 | } |
0d62e5e8 | 1721 | else |
da6d8c04 | 1722 | { |
0d62e5e8 DJ |
1723 | if (!WIFSTOPPED (w)) |
1724 | goto retry; | |
da6d8c04 DJ |
1725 | } |
1726 | ||
6bf5e0ba PA |
1727 | /* If this event was not handled before, and is not a SIGTRAP, we |
1728 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
1729 | a breakpoint is inserted at the current PC. If this target does | |
1730 | not support internal breakpoints at all, we also report the | |
1731 | SIGTRAP without further processing; it's of no concern to us. */ | |
1732 | maybe_internal_trap | |
1733 | = (supports_breakpoints () | |
1734 | && (WSTOPSIG (w) == SIGTRAP | |
1735 | || ((WSTOPSIG (w) == SIGILL | |
1736 | || WSTOPSIG (w) == SIGSEGV) | |
1737 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
1738 | ||
1739 | if (maybe_internal_trap) | |
1740 | { | |
1741 | /* Handle anything that requires bookkeeping before deciding to | |
1742 | report the event or continue waiting. */ | |
1743 | ||
1744 | /* First check if we can explain the SIGTRAP with an internal | |
1745 | breakpoint, or if we should possibly report the event to GDB. | |
1746 | Do this before anything that may remove or insert a | |
1747 | breakpoint. */ | |
1748 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
1749 | ||
1750 | /* We have a SIGTRAP, possibly a step-over dance has just | |
1751 | finished. If so, tweak the state machine accordingly, | |
1752 | reinsert breakpoints and delete any reinsert (software | |
1753 | single-step) breakpoints. */ | |
1754 | step_over_finished = finish_step_over (event_child); | |
1755 | ||
1756 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
1757 | check_breakpoints (event_child->stop_pc); | |
1758 | ||
219f2f23 PA |
1759 | /* Handle tracepoint data collecting. This may overflow the |
1760 | trace buffer, and cause a tracing stop, removing | |
1761 | breakpoints. */ | |
1762 | trace_event = handle_tracepoints (event_child); | |
1763 | ||
6bf5e0ba PA |
1764 | if (bp_explains_trap) |
1765 | { | |
1766 | /* If we stepped or ran into an internal breakpoint, we've | |
1767 | already handled it. So next time we resume (from this | |
1768 | PC), we should step over it. */ | |
1769 | if (debug_threads) | |
1770 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1771 | ||
8b07ae33 PA |
1772 | if (breakpoint_here (event_child->stop_pc)) |
1773 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
1774 | } |
1775 | } | |
1776 | else | |
1777 | { | |
1778 | /* We have some other signal, possibly a step-over dance was in | |
1779 | progress, and it should be cancelled too. */ | |
1780 | step_over_finished = finish_step_over (event_child); | |
219f2f23 PA |
1781 | |
1782 | trace_event = 0; | |
6bf5e0ba PA |
1783 | } |
1784 | ||
1785 | /* We have all the data we need. Either report the event to GDB, or | |
1786 | resume threads and keep waiting for more. */ | |
1787 | ||
1788 | /* Check If GDB would be interested in this event. If GDB wanted | |
1789 | this thread to single step, we always want to report the SIGTRAP, | |
8b07ae33 PA |
1790 | and let GDB handle it. Watchpoints should always be reported. |
1791 | So should signals we can't explain. A SIGTRAP we can't explain | |
1792 | could be a GDB breakpoint --- we may or not support Z0 | |
1793 | breakpoints. If we do, we're be able to handle GDB breakpoints | |
1794 | on top of internal breakpoints, by handling the internal | |
1795 | breakpoint and still reporting the event to GDB. If we don't, | |
1796 | we're out of luck, GDB won't see the breakpoint hit. */ | |
6bf5e0ba | 1797 | report_to_gdb = (!maybe_internal_trap |
8336d594 | 1798 | || current_inferior->last_resume_kind == resume_step |
6bf5e0ba | 1799 | || event_child->stopped_by_watchpoint |
219f2f23 | 1800 | || (!step_over_finished && !bp_explains_trap && !trace_event) |
8b07ae33 | 1801 | || gdb_breakpoint_here (event_child->stop_pc)); |
6bf5e0ba PA |
1802 | |
1803 | /* We found no reason GDB would want us to stop. We either hit one | |
1804 | of our own breakpoints, or finished an internal step GDB | |
1805 | shouldn't know about. */ | |
1806 | if (!report_to_gdb) | |
1807 | { | |
1808 | if (debug_threads) | |
1809 | { | |
1810 | if (bp_explains_trap) | |
1811 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
1812 | if (step_over_finished) | |
1813 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
1814 | if (trace_event) |
1815 | fprintf (stderr, "Tracepoint event.\n"); | |
6bf5e0ba PA |
1816 | } |
1817 | ||
1818 | /* We're not reporting this breakpoint to GDB, so apply the | |
1819 | decr_pc_after_break adjustment to the inferior's regcache | |
1820 | ourselves. */ | |
1821 | ||
1822 | if (the_low_target.set_pc != NULL) | |
1823 | { | |
1824 | struct regcache *regcache | |
1825 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
1826 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
1827 | } | |
1828 | ||
1829 | /* We've finished stepping over a breakpoint. We've stopped all | |
1830 | LWPs momentarily except the stepping one. This is where we | |
1831 | resume them all again. We're going to keep waiting, so use | |
1832 | proceed, which handles stepping over the next breakpoint. */ | |
1833 | if (debug_threads) | |
1834 | fprintf (stderr, "proceeding all threads.\n"); | |
1835 | proceed_all_lwps (); | |
1836 | goto retry; | |
1837 | } | |
1838 | ||
1839 | if (debug_threads) | |
1840 | { | |
8336d594 | 1841 | if (current_inferior->last_resume_kind == resume_step) |
6bf5e0ba PA |
1842 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); |
1843 | if (event_child->stopped_by_watchpoint) | |
1844 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
1845 | if (gdb_breakpoint_here (event_child->stop_pc)) |
1846 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
1847 | if (debug_threads) |
1848 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
1849 | } | |
1850 | ||
1851 | /* Alright, we're going to report a stop. */ | |
1852 | ||
1853 | if (!non_stop) | |
1854 | { | |
1855 | /* In all-stop, stop all threads. */ | |
1856 | stop_all_lwps (); | |
1857 | ||
1858 | /* If we're not waiting for a specific LWP, choose an event LWP | |
1859 | from among those that have had events. Giving equal priority | |
1860 | to all LWPs that have had events helps prevent | |
1861 | starvation. */ | |
1862 | if (ptid_equal (ptid, minus_one_ptid)) | |
1863 | { | |
1864 | event_child->status_pending_p = 1; | |
1865 | event_child->status_pending = w; | |
1866 | ||
1867 | select_event_lwp (&event_child); | |
1868 | ||
1869 | event_child->status_pending_p = 0; | |
1870 | w = event_child->status_pending; | |
1871 | } | |
1872 | ||
1873 | /* Now that we've selected our final event LWP, cancel any | |
1874 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
1875 | See the comment in cancel_breakpoints_callback to find out | |
1876 | why. */ | |
1877 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
1878 | } | |
1879 | else | |
1880 | { | |
1881 | /* If we just finished a step-over, then all threads had been | |
1882 | momentarily paused. In all-stop, that's fine, we want | |
1883 | threads stopped by now anyway. In non-stop, we need to | |
1884 | re-resume threads that GDB wanted to be running. */ | |
1885 | if (step_over_finished) | |
1886 | unstop_all_lwps (event_child); | |
1887 | } | |
1888 | ||
5b1c542e | 1889 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 1890 | |
d50171e4 PA |
1891 | /* Do this before the gdb_wants_all_stopped calls below, since they |
1892 | always set last_resume_kind to resume_stop. */ | |
8336d594 PA |
1893 | if (current_inferior->last_resume_kind == resume_stop |
1894 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
1895 | { |
1896 | /* A thread that has been requested to stop by GDB with vCont;t, | |
1897 | and it stopped cleanly, so report as SIG0. The use of | |
1898 | SIGSTOP is an implementation detail. */ | |
1899 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
1900 | } | |
8336d594 PA |
1901 | else if (current_inferior->last_resume_kind == resume_stop |
1902 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
1903 | { |
1904 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 1905 | but, it stopped for other reasons. */ |
bd99dc85 PA |
1906 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); |
1907 | } | |
1908 | else | |
1909 | { | |
1910 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w)); | |
1911 | } | |
1912 | ||
d50171e4 PA |
1913 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
1914 | ||
1915 | if (!non_stop) | |
1916 | { | |
d50171e4 PA |
1917 | /* From GDB's perspective, all-stop mode always stops all |
1918 | threads implicitly. Tag all threads as "want-stopped". */ | |
1919 | gdb_wants_all_stopped (); | |
1920 | } | |
1921 | else | |
1922 | { | |
1923 | /* We're reporting this LWP as stopped. Update it's | |
1924 | "want-stopped" state to what the client wants, until it gets | |
1925 | a new resume action. */ | |
6bf5e0ba | 1926 | gdb_wants_lwp_stopped (&event_child->head); |
d50171e4 PA |
1927 | } |
1928 | ||
bd99dc85 | 1929 | if (debug_threads) |
95954743 | 1930 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 1931 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
1932 | ourstatus->kind, |
1933 | ourstatus->value.sig); | |
1934 | ||
6bf5e0ba PA |
1935 | get_lwp_thread (event_child)->last_status = *ourstatus; |
1936 | return ptid_of (event_child); | |
bd99dc85 PA |
1937 | } |
1938 | ||
1939 | /* Get rid of any pending event in the pipe. */ | |
1940 | static void | |
1941 | async_file_flush (void) | |
1942 | { | |
1943 | int ret; | |
1944 | char buf; | |
1945 | ||
1946 | do | |
1947 | ret = read (linux_event_pipe[0], &buf, 1); | |
1948 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
1949 | } | |
1950 | ||
1951 | /* Put something in the pipe, so the event loop wakes up. */ | |
1952 | static void | |
1953 | async_file_mark (void) | |
1954 | { | |
1955 | int ret; | |
1956 | ||
1957 | async_file_flush (); | |
1958 | ||
1959 | do | |
1960 | ret = write (linux_event_pipe[1], "+", 1); | |
1961 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
1962 | ||
1963 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
1964 | be awakened anyway. */ | |
1965 | } | |
1966 | ||
95954743 PA |
1967 | static ptid_t |
1968 | linux_wait (ptid_t ptid, | |
1969 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 1970 | { |
95954743 | 1971 | ptid_t event_ptid; |
bd99dc85 PA |
1972 | |
1973 | if (debug_threads) | |
95954743 | 1974 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
1975 | |
1976 | /* Flush the async file first. */ | |
1977 | if (target_is_async_p ()) | |
1978 | async_file_flush (); | |
1979 | ||
95954743 | 1980 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
1981 | |
1982 | /* If at least one stop was reported, there may be more. A single | |
1983 | SIGCHLD can signal more than one child stop. */ | |
1984 | if (target_is_async_p () | |
1985 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 1986 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
1987 | async_file_mark (); |
1988 | ||
1989 | return event_ptid; | |
da6d8c04 DJ |
1990 | } |
1991 | ||
c5f62d5f | 1992 | /* Send a signal to an LWP. */ |
fd500816 DJ |
1993 | |
1994 | static int | |
a1928bad | 1995 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 1996 | { |
c5f62d5f DE |
1997 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1998 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 1999 | |
c5f62d5f DE |
2000 | #ifdef __NR_tkill |
2001 | { | |
2002 | static int tkill_failed; | |
fd500816 | 2003 | |
c5f62d5f DE |
2004 | if (!tkill_failed) |
2005 | { | |
2006 | int ret; | |
2007 | ||
2008 | errno = 0; | |
2009 | ret = syscall (__NR_tkill, lwpid, signo); | |
2010 | if (errno != ENOSYS) | |
2011 | return ret; | |
2012 | tkill_failed = 1; | |
2013 | } | |
2014 | } | |
fd500816 DJ |
2015 | #endif |
2016 | ||
2017 | return kill (lwpid, signo); | |
2018 | } | |
2019 | ||
0d62e5e8 DJ |
2020 | static void |
2021 | send_sigstop (struct inferior_list_entry *entry) | |
2022 | { | |
54a0b537 | 2023 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2024 | int pid; |
0d62e5e8 | 2025 | |
54a0b537 | 2026 | if (lwp->stopped) |
0d62e5e8 DJ |
2027 | return; |
2028 | ||
bd99dc85 PA |
2029 | pid = lwpid_of (lwp); |
2030 | ||
0d62e5e8 DJ |
2031 | /* If we already have a pending stop signal for this process, don't |
2032 | send another. */ | |
54a0b537 | 2033 | if (lwp->stop_expected) |
0d62e5e8 | 2034 | { |
ae13219e | 2035 | if (debug_threads) |
bd99dc85 | 2036 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2037 | |
0d62e5e8 DJ |
2038 | return; |
2039 | } | |
2040 | ||
2041 | if (debug_threads) | |
bd99dc85 | 2042 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2043 | |
d50171e4 | 2044 | lwp->stop_expected = 1; |
bd99dc85 | 2045 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2046 | } |
2047 | ||
95954743 PA |
2048 | static void |
2049 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2050 | { | |
2051 | /* It's dead, really. */ | |
2052 | lwp->dead = 1; | |
2053 | ||
2054 | /* Store the exit status for later. */ | |
2055 | lwp->status_pending_p = 1; | |
2056 | lwp->status_pending = wstat; | |
2057 | ||
95954743 PA |
2058 | /* Prevent trying to stop it. */ |
2059 | lwp->stopped = 1; | |
2060 | ||
2061 | /* No further stops are expected from a dead lwp. */ | |
2062 | lwp->stop_expected = 0; | |
2063 | } | |
2064 | ||
0d62e5e8 DJ |
2065 | static void |
2066 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2067 | { | |
54a0b537 | 2068 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2069 | struct thread_info *saved_inferior; |
a1928bad | 2070 | int wstat; |
95954743 PA |
2071 | ptid_t saved_tid; |
2072 | ptid_t ptid; | |
d50171e4 | 2073 | int pid; |
0d62e5e8 | 2074 | |
54a0b537 | 2075 | if (lwp->stopped) |
d50171e4 PA |
2076 | { |
2077 | if (debug_threads) | |
2078 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2079 | lwpid_of (lwp)); | |
2080 | return; | |
2081 | } | |
0d62e5e8 DJ |
2082 | |
2083 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2084 | if (saved_inferior != NULL) |
2085 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2086 | else | |
95954743 | 2087 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2088 | |
95954743 | 2089 | ptid = lwp->head.id; |
bd99dc85 | 2090 | |
d50171e4 PA |
2091 | if (debug_threads) |
2092 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2093 | ||
2094 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2095 | |
2096 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2097 | and record the pending SIGSTOP. If the process exited, just | |
2098 | return. */ | |
d50171e4 | 2099 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2100 | { |
2101 | if (debug_threads) | |
d50171e4 PA |
2102 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2103 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2104 | |
d50171e4 | 2105 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2106 | { |
2107 | if (debug_threads) | |
d50171e4 PA |
2108 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2109 | lwpid_of (lwp), wstat); | |
2110 | ||
c35fafde PA |
2111 | lwp->status_pending_p = 1; |
2112 | lwp->status_pending = wstat; | |
2113 | } | |
0d62e5e8 | 2114 | } |
d50171e4 | 2115 | else |
95954743 PA |
2116 | { |
2117 | if (debug_threads) | |
d50171e4 | 2118 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2119 | |
d50171e4 PA |
2120 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2121 | if (lwp) | |
2122 | { | |
2123 | /* Leave this status pending for the next time we're able to | |
2124 | report it. In the mean time, we'll report this lwp as | |
2125 | dead to GDB, so GDB doesn't try to read registers and | |
2126 | memory from it. This can only happen if this was the | |
2127 | last thread of the process; otherwise, PID is removed | |
2128 | from the thread tables before linux_wait_for_event | |
2129 | returns. */ | |
2130 | mark_lwp_dead (lwp, wstat); | |
2131 | } | |
95954743 | 2132 | } |
0d62e5e8 | 2133 | |
bd99dc85 | 2134 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2135 | current_inferior = saved_inferior; |
2136 | else | |
2137 | { | |
2138 | if (debug_threads) | |
2139 | fprintf (stderr, "Previously current thread died.\n"); | |
2140 | ||
bd99dc85 PA |
2141 | if (non_stop) |
2142 | { | |
2143 | /* We can't change the current inferior behind GDB's back, | |
2144 | otherwise, a subsequent command may apply to the wrong | |
2145 | process. */ | |
2146 | current_inferior = NULL; | |
2147 | } | |
2148 | else | |
2149 | { | |
2150 | /* Set a valid thread as current. */ | |
2151 | set_desired_inferior (0); | |
2152 | } | |
0d62e5e8 DJ |
2153 | } |
2154 | } | |
2155 | ||
2156 | static void | |
54a0b537 | 2157 | stop_all_lwps (void) |
0d62e5e8 DJ |
2158 | { |
2159 | stopping_threads = 1; | |
54a0b537 PA |
2160 | for_each_inferior (&all_lwps, send_sigstop); |
2161 | for_each_inferior (&all_lwps, wait_for_sigstop); | |
0d62e5e8 DJ |
2162 | stopping_threads = 0; |
2163 | } | |
2164 | ||
da6d8c04 DJ |
2165 | /* Resume execution of the inferior process. |
2166 | If STEP is nonzero, single-step it. | |
2167 | If SIGNAL is nonzero, give it that signal. */ | |
2168 | ||
ce3a066d | 2169 | static void |
2acc282a | 2170 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 2171 | int step, int signal, siginfo_t *info) |
da6d8c04 | 2172 | { |
0d62e5e8 DJ |
2173 | struct thread_info *saved_inferior; |
2174 | ||
54a0b537 | 2175 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
2176 | return; |
2177 | ||
219f2f23 PA |
2178 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
2179 | user used the "jump" command, or "set $pc = foo"). */ | |
2180 | if (lwp->stop_pc != get_pc (lwp)) | |
2181 | { | |
2182 | /* Collecting 'while-stepping' actions doesn't make sense | |
2183 | anymore. */ | |
2184 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
2185 | } | |
2186 | ||
0d62e5e8 DJ |
2187 | /* If we have pending signals or status, and a new signal, enqueue the |
2188 | signal. Also enqueue the signal if we are waiting to reinsert a | |
2189 | breakpoint; it will be picked up again below. */ | |
2190 | if (signal != 0 | |
54a0b537 PA |
2191 | && (lwp->status_pending_p || lwp->pending_signals != NULL |
2192 | || lwp->bp_reinsert != 0)) | |
0d62e5e8 DJ |
2193 | { |
2194 | struct pending_signals *p_sig; | |
bca929d3 | 2195 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 2196 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 2197 | p_sig->signal = signal; |
32ca6d61 DJ |
2198 | if (info == NULL) |
2199 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2200 | else | |
2201 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 2202 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
2203 | } |
2204 | ||
d50171e4 PA |
2205 | if (lwp->status_pending_p) |
2206 | { | |
2207 | if (debug_threads) | |
2208 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
2209 | " has pending status\n", | |
2210 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
2211 | lwp->stop_expected ? "expected" : "not expected"); | |
2212 | return; | |
2213 | } | |
0d62e5e8 DJ |
2214 | |
2215 | saved_inferior = current_inferior; | |
54a0b537 | 2216 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
2217 | |
2218 | if (debug_threads) | |
1b3f6016 | 2219 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 2220 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 2221 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
2222 | |
2223 | /* This bit needs some thinking about. If we get a signal that | |
2224 | we must report while a single-step reinsert is still pending, | |
2225 | we often end up resuming the thread. It might be better to | |
2226 | (ew) allow a stack of pending events; then we could be sure that | |
2227 | the reinsert happened right away and not lose any signals. | |
2228 | ||
2229 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 2230 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
2231 | complete correctness, so it won't solve that problem. It may be |
2232 | worthwhile just to solve this one, however. */ | |
54a0b537 | 2233 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
2234 | { |
2235 | if (debug_threads) | |
d50171e4 PA |
2236 | fprintf (stderr, " pending reinsert at 0x%s\n", |
2237 | paddress (lwp->bp_reinsert)); | |
2238 | ||
2239 | if (lwp->bp_reinsert != 0 && can_hardware_single_step ()) | |
2240 | { | |
2241 | if (step == 0) | |
2242 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
2243 | ||
2244 | step = 1; | |
2245 | } | |
0d62e5e8 DJ |
2246 | |
2247 | /* Postpone any pending signal. It was enqueued above. */ | |
2248 | signal = 0; | |
2249 | } | |
2250 | ||
219f2f23 PA |
2251 | /* If we have while-stepping actions in this thread set it stepping. |
2252 | If we have a signal to deliver, it may or may not be set to | |
2253 | SIG_IGN, we don't know. Assume so, and allow collecting | |
2254 | while-stepping into a signal handler. A possible smart thing to | |
2255 | do would be to set an internal breakpoint at the signal return | |
2256 | address, continue, and carry on catching this while-stepping | |
2257 | action only when that breakpoint is hit. A future | |
2258 | enhancement. */ | |
2259 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
2260 | && can_hardware_single_step ()) | |
2261 | { | |
2262 | if (debug_threads) | |
2263 | fprintf (stderr, | |
2264 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
2265 | lwpid_of (lwp)); | |
2266 | step = 1; | |
2267 | } | |
2268 | ||
aa691b87 | 2269 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 2270 | { |
442ea881 PA |
2271 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
2272 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 2273 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
2274 | } |
2275 | ||
2276 | /* If we have pending signals, consume one unless we are trying to reinsert | |
2277 | a breakpoint. */ | |
54a0b537 | 2278 | if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0) |
0d62e5e8 DJ |
2279 | { |
2280 | struct pending_signals **p_sig; | |
2281 | ||
54a0b537 | 2282 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
2283 | while ((*p_sig)->prev != NULL) |
2284 | p_sig = &(*p_sig)->prev; | |
2285 | ||
2286 | signal = (*p_sig)->signal; | |
32ca6d61 | 2287 | if ((*p_sig)->info.si_signo != 0) |
bd99dc85 | 2288 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info); |
32ca6d61 | 2289 | |
0d62e5e8 DJ |
2290 | free (*p_sig); |
2291 | *p_sig = NULL; | |
2292 | } | |
2293 | ||
aa5ca48f DE |
2294 | if (the_low_target.prepare_to_resume != NULL) |
2295 | the_low_target.prepare_to_resume (lwp); | |
2296 | ||
0d62e5e8 | 2297 | regcache_invalidate_one ((struct inferior_list_entry *) |
54a0b537 | 2298 | get_lwp_thread (lwp)); |
da6d8c04 | 2299 | errno = 0; |
54a0b537 | 2300 | lwp->stopped = 0; |
c3adc08c | 2301 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 2302 | lwp->stepping = step; |
14ce3065 DE |
2303 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, |
2304 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2305 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2306 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
2307 | |
2308 | current_inferior = saved_inferior; | |
da6d8c04 | 2309 | if (errno) |
3221518c UW |
2310 | { |
2311 | /* ESRCH from ptrace either means that the thread was already | |
2312 | running (an error) or that it is gone (a race condition). If | |
2313 | it's gone, we will get a notification the next time we wait, | |
2314 | so we can ignore the error. We could differentiate these | |
2315 | two, but it's tricky without waiting; the thread still exists | |
2316 | as a zombie, so sending it signal 0 would succeed. So just | |
2317 | ignore ESRCH. */ | |
2318 | if (errno == ESRCH) | |
2319 | return; | |
2320 | ||
2321 | perror_with_name ("ptrace"); | |
2322 | } | |
da6d8c04 DJ |
2323 | } |
2324 | ||
2bd7c093 PA |
2325 | struct thread_resume_array |
2326 | { | |
2327 | struct thread_resume *resume; | |
2328 | size_t n; | |
2329 | }; | |
64386c31 DJ |
2330 | |
2331 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
2332 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
2333 | resume request. | |
2334 | ||
2335 | This algorithm is O(threads * resume elements), but resume elements | |
2336 | is small (and will remain small at least until GDB supports thread | |
2337 | suspension). */ | |
2bd7c093 PA |
2338 | static int |
2339 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 2340 | { |
54a0b537 | 2341 | struct lwp_info *lwp; |
64386c31 | 2342 | struct thread_info *thread; |
5544ad89 | 2343 | int ndx; |
2bd7c093 | 2344 | struct thread_resume_array *r; |
64386c31 DJ |
2345 | |
2346 | thread = (struct thread_info *) entry; | |
54a0b537 | 2347 | lwp = get_thread_lwp (thread); |
2bd7c093 | 2348 | r = arg; |
64386c31 | 2349 | |
2bd7c093 | 2350 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
2351 | { |
2352 | ptid_t ptid = r->resume[ndx].thread; | |
2353 | if (ptid_equal (ptid, minus_one_ptid) | |
2354 | || ptid_equal (ptid, entry->id) | |
2355 | || (ptid_is_pid (ptid) | |
2356 | && (ptid_get_pid (ptid) == pid_of (lwp))) | |
2357 | || (ptid_get_lwp (ptid) == -1 | |
2358 | && (ptid_get_pid (ptid) == pid_of (lwp)))) | |
2359 | { | |
d50171e4 | 2360 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 2361 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
2362 | { |
2363 | if (debug_threads) | |
2364 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
2365 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
2366 | ? "stopped" | |
2367 | : "stopping", | |
2368 | lwpid_of (lwp)); | |
2369 | ||
2370 | continue; | |
2371 | } | |
2372 | ||
95954743 | 2373 | lwp->resume = &r->resume[ndx]; |
8336d594 | 2374 | thread->last_resume_kind = lwp->resume->kind; |
95954743 PA |
2375 | return 0; |
2376 | } | |
2377 | } | |
2bd7c093 PA |
2378 | |
2379 | /* No resume action for this thread. */ | |
2380 | lwp->resume = NULL; | |
64386c31 | 2381 | |
2bd7c093 | 2382 | return 0; |
5544ad89 DJ |
2383 | } |
2384 | ||
5544ad89 | 2385 | |
bd99dc85 PA |
2386 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
2387 | static int | |
2388 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 2389 | { |
bd99dc85 | 2390 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 2391 | |
bd99dc85 PA |
2392 | /* LWPs which will not be resumed are not interesting, because |
2393 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 2394 | if (lwp->resume == NULL) |
bd99dc85 | 2395 | return 0; |
64386c31 | 2396 | |
bd99dc85 | 2397 | if (lwp->status_pending_p) |
d50171e4 PA |
2398 | * (int *) flag_p = 1; |
2399 | ||
2400 | return 0; | |
2401 | } | |
2402 | ||
2403 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
2404 | internal breakpoint that we need to step over. It assumes that any | |
2405 | required STOP_PC adjustment has already been propagated to the | |
2406 | inferior's regcache. */ | |
2407 | ||
2408 | static int | |
2409 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
2410 | { | |
2411 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 2412 | struct thread_info *thread; |
d50171e4 PA |
2413 | struct thread_info *saved_inferior; |
2414 | CORE_ADDR pc; | |
2415 | ||
2416 | /* LWPs which will not be resumed are not interesting, because we | |
2417 | might not wait for them next time through linux_wait. */ | |
2418 | ||
2419 | if (!lwp->stopped) | |
2420 | { | |
2421 | if (debug_threads) | |
2422 | fprintf (stderr, | |
2423 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
2424 | lwpid_of (lwp)); | |
2425 | return 0; | |
2426 | } | |
2427 | ||
8336d594 PA |
2428 | thread = get_lwp_thread (lwp); |
2429 | ||
2430 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
2431 | { |
2432 | if (debug_threads) | |
2433 | fprintf (stderr, | |
2434 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
2435 | lwpid_of (lwp)); | |
2436 | return 0; | |
2437 | } | |
2438 | ||
2439 | if (!lwp->need_step_over) | |
2440 | { | |
2441 | if (debug_threads) | |
2442 | fprintf (stderr, | |
2443 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
2444 | } | |
5544ad89 | 2445 | |
bd99dc85 | 2446 | if (lwp->status_pending_p) |
d50171e4 PA |
2447 | { |
2448 | if (debug_threads) | |
2449 | fprintf (stderr, | |
2450 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
2451 | lwpid_of (lwp)); | |
2452 | return 0; | |
2453 | } | |
2454 | ||
2455 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
2456 | or we have. */ | |
2457 | pc = get_pc (lwp); | |
2458 | ||
2459 | /* If the PC has changed since we stopped, then don't do anything, | |
2460 | and let the breakpoint/tracepoint be hit. This happens if, for | |
2461 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
2462 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
2463 | command, or poked thread's registers herself. */ | |
2464 | if (pc != lwp->stop_pc) | |
2465 | { | |
2466 | if (debug_threads) | |
2467 | fprintf (stderr, | |
2468 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
2469 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
2470 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
2471 | ||
2472 | lwp->need_step_over = 0; | |
2473 | return 0; | |
2474 | } | |
2475 | ||
2476 | saved_inferior = current_inferior; | |
8336d594 | 2477 | current_inferior = thread; |
d50171e4 | 2478 | |
8b07ae33 | 2479 | /* We can only step over breakpoints we know about. */ |
d50171e4 PA |
2480 | if (breakpoint_here (pc)) |
2481 | { | |
8b07ae33 PA |
2482 | /* Don't step over a breakpoint that GDB expects to hit |
2483 | though. */ | |
2484 | if (gdb_breakpoint_here (pc)) | |
2485 | { | |
2486 | if (debug_threads) | |
2487 | fprintf (stderr, | |
2488 | "Need step over [LWP %ld]? yes, but found" | |
2489 | " GDB breakpoint at 0x%s; skipping step over\n", | |
2490 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 2491 | |
8b07ae33 PA |
2492 | current_inferior = saved_inferior; |
2493 | return 0; | |
2494 | } | |
2495 | else | |
2496 | { | |
2497 | if (debug_threads) | |
2498 | fprintf (stderr, | |
2499 | "Need step over [LWP %ld]? yes, found breakpoint at 0x%s\n", | |
2500 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 2501 | |
8b07ae33 PA |
2502 | /* We've found an lwp that needs stepping over --- return 1 so |
2503 | that find_inferior stops looking. */ | |
2504 | current_inferior = saved_inferior; | |
2505 | ||
2506 | /* If the step over is cancelled, this is set again. */ | |
2507 | lwp->need_step_over = 0; | |
2508 | return 1; | |
2509 | } | |
d50171e4 PA |
2510 | } |
2511 | ||
2512 | current_inferior = saved_inferior; | |
2513 | ||
2514 | if (debug_threads) | |
2515 | fprintf (stderr, | |
2516 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
2517 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 2518 | |
bd99dc85 | 2519 | return 0; |
5544ad89 DJ |
2520 | } |
2521 | ||
d50171e4 PA |
2522 | /* Start a step-over operation on LWP. When LWP stopped at a |
2523 | breakpoint, to make progress, we need to remove the breakpoint out | |
2524 | of the way. If we let other threads run while we do that, they may | |
2525 | pass by the breakpoint location and miss hitting it. To avoid | |
2526 | that, a step-over momentarily stops all threads while LWP is | |
2527 | single-stepped while the breakpoint is temporarily uninserted from | |
2528 | the inferior. When the single-step finishes, we reinsert the | |
2529 | breakpoint, and let all threads that are supposed to be running, | |
2530 | run again. | |
2531 | ||
2532 | On targets that don't support hardware single-step, we don't | |
2533 | currently support full software single-stepping. Instead, we only | |
2534 | support stepping over the thread event breakpoint, by asking the | |
2535 | low target where to place a reinsert breakpoint. Since this | |
2536 | routine assumes the breakpoint being stepped over is a thread event | |
2537 | breakpoint, it usually assumes the return address of the current | |
2538 | function is a good enough place to set the reinsert breakpoint. */ | |
2539 | ||
2540 | static int | |
2541 | start_step_over (struct lwp_info *lwp) | |
2542 | { | |
2543 | struct thread_info *saved_inferior; | |
2544 | CORE_ADDR pc; | |
2545 | int step; | |
2546 | ||
2547 | if (debug_threads) | |
2548 | fprintf (stderr, | |
2549 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
2550 | lwpid_of (lwp)); | |
2551 | ||
2552 | stop_all_lwps (); | |
2553 | ||
2554 | if (debug_threads) | |
2555 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
2556 | ||
2557 | /* Note, we should always reach here with an already adjusted PC, | |
2558 | either by GDB (if we're resuming due to GDB's request), or by our | |
2559 | caller, if we just finished handling an internal breakpoint GDB | |
2560 | shouldn't care about. */ | |
2561 | pc = get_pc (lwp); | |
2562 | ||
2563 | saved_inferior = current_inferior; | |
2564 | current_inferior = get_lwp_thread (lwp); | |
2565 | ||
2566 | lwp->bp_reinsert = pc; | |
2567 | uninsert_breakpoints_at (pc); | |
2568 | ||
2569 | if (can_hardware_single_step ()) | |
2570 | { | |
2571 | step = 1; | |
2572 | } | |
2573 | else | |
2574 | { | |
2575 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
2576 | set_reinsert_breakpoint (raddr); | |
2577 | step = 0; | |
2578 | } | |
2579 | ||
2580 | current_inferior = saved_inferior; | |
2581 | ||
2582 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
2583 | ||
2584 | /* Require next event from this LWP. */ | |
2585 | step_over_bkpt = lwp->head.id; | |
2586 | return 1; | |
2587 | } | |
2588 | ||
2589 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
2590 | start_step_over, if still there, and delete any reinsert | |
2591 | breakpoints we've set, on non hardware single-step targets. */ | |
2592 | ||
2593 | static int | |
2594 | finish_step_over (struct lwp_info *lwp) | |
2595 | { | |
2596 | if (lwp->bp_reinsert != 0) | |
2597 | { | |
2598 | if (debug_threads) | |
2599 | fprintf (stderr, "Finished step over.\n"); | |
2600 | ||
2601 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
2602 | may be no breakpoint to reinsert there by now. */ | |
2603 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
2604 | ||
2605 | lwp->bp_reinsert = 0; | |
2606 | ||
2607 | /* Delete any software-single-step reinsert breakpoints. No | |
2608 | longer needed. We don't have to worry about other threads | |
2609 | hitting this trap, and later not being able to explain it, | |
2610 | because we were stepping over a breakpoint, and we hold all | |
2611 | threads but LWP stopped while doing that. */ | |
2612 | if (!can_hardware_single_step ()) | |
2613 | delete_reinsert_breakpoints (); | |
2614 | ||
2615 | step_over_bkpt = null_ptid; | |
2616 | return 1; | |
2617 | } | |
2618 | else | |
2619 | return 0; | |
2620 | } | |
2621 | ||
5544ad89 DJ |
2622 | /* This function is called once per thread. We check the thread's resume |
2623 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 2624 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 2625 | |
bd99dc85 PA |
2626 | For threads which we aren't explicitly told otherwise, we preserve |
2627 | the stepping flag; this is used for stepping over gdbserver-placed | |
2628 | breakpoints. | |
2629 | ||
2630 | If pending_flags was set in any thread, we queue any needed | |
2631 | signals, since we won't actually resume. We already have a pending | |
2632 | event to report, so we don't need to preserve any step requests; | |
2633 | they should be re-issued if necessary. */ | |
2634 | ||
2635 | static int | |
2636 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 2637 | { |
54a0b537 | 2638 | struct lwp_info *lwp; |
5544ad89 | 2639 | struct thread_info *thread; |
bd99dc85 | 2640 | int step; |
d50171e4 PA |
2641 | int leave_all_stopped = * (int *) arg; |
2642 | int leave_pending; | |
5544ad89 DJ |
2643 | |
2644 | thread = (struct thread_info *) entry; | |
54a0b537 | 2645 | lwp = get_thread_lwp (thread); |
5544ad89 | 2646 | |
2bd7c093 | 2647 | if (lwp->resume == NULL) |
bd99dc85 | 2648 | return 0; |
5544ad89 | 2649 | |
bd99dc85 | 2650 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 2651 | { |
bd99dc85 | 2652 | if (debug_threads) |
d50171e4 | 2653 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
2654 | |
2655 | if (!lwp->stopped) | |
2656 | { | |
2657 | if (debug_threads) | |
d50171e4 | 2658 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 2659 | |
d50171e4 PA |
2660 | /* Stop the thread, and wait for the event asynchronously, |
2661 | through the event loop. */ | |
bd99dc85 PA |
2662 | send_sigstop (&lwp->head); |
2663 | } | |
2664 | else | |
2665 | { | |
2666 | if (debug_threads) | |
d50171e4 PA |
2667 | fprintf (stderr, "already stopped LWP %ld\n", |
2668 | lwpid_of (lwp)); | |
2669 | ||
2670 | /* The LWP may have been stopped in an internal event that | |
2671 | was not meant to be notified back to GDB (e.g., gdbserver | |
2672 | breakpoint), so we should be reporting a stop event in | |
2673 | this case too. */ | |
2674 | ||
2675 | /* If the thread already has a pending SIGSTOP, this is a | |
2676 | no-op. Otherwise, something later will presumably resume | |
2677 | the thread and this will cause it to cancel any pending | |
2678 | operation, due to last_resume_kind == resume_stop. If | |
2679 | the thread already has a pending status to report, we | |
2680 | will still report it the next time we wait - see | |
2681 | status_pending_p_callback. */ | |
2682 | send_sigstop (&lwp->head); | |
bd99dc85 | 2683 | } |
32ca6d61 | 2684 | |
bd99dc85 PA |
2685 | /* For stop requests, we're done. */ |
2686 | lwp->resume = NULL; | |
fc7238bb | 2687 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 2688 | return 0; |
5544ad89 DJ |
2689 | } |
2690 | ||
bd99dc85 PA |
2691 | /* If this thread which is about to be resumed has a pending status, |
2692 | then don't resume any threads - we can just report the pending | |
2693 | status. Make sure to queue any signals that would otherwise be | |
2694 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
2695 | thread has a pending status. If there's a thread that needs the |
2696 | step-over-breakpoint dance, then don't resume any other thread | |
2697 | but that particular one. */ | |
2698 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 2699 | |
d50171e4 | 2700 | if (!leave_pending) |
bd99dc85 PA |
2701 | { |
2702 | if (debug_threads) | |
2703 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 2704 | |
d50171e4 | 2705 | step = (lwp->resume->kind == resume_step); |
2acc282a | 2706 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
2707 | } |
2708 | else | |
2709 | { | |
2710 | if (debug_threads) | |
2711 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 2712 | |
bd99dc85 PA |
2713 | /* If we have a new signal, enqueue the signal. */ |
2714 | if (lwp->resume->sig != 0) | |
2715 | { | |
2716 | struct pending_signals *p_sig; | |
2717 | p_sig = xmalloc (sizeof (*p_sig)); | |
2718 | p_sig->prev = lwp->pending_signals; | |
2719 | p_sig->signal = lwp->resume->sig; | |
2720 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
2721 | ||
2722 | /* If this is the same signal we were previously stopped by, | |
2723 | make sure to queue its siginfo. We can ignore the return | |
2724 | value of ptrace; if it fails, we'll skip | |
2725 | PTRACE_SETSIGINFO. */ | |
2726 | if (WIFSTOPPED (lwp->last_status) | |
2727 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
2728 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info); | |
2729 | ||
2730 | lwp->pending_signals = p_sig; | |
2731 | } | |
2732 | } | |
5544ad89 | 2733 | |
fc7238bb | 2734 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 2735 | lwp->resume = NULL; |
5544ad89 | 2736 | return 0; |
0d62e5e8 DJ |
2737 | } |
2738 | ||
2739 | static void | |
2bd7c093 | 2740 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 2741 | { |
2bd7c093 | 2742 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
2743 | struct lwp_info *need_step_over = NULL; |
2744 | int any_pending; | |
2745 | int leave_all_stopped; | |
c6ecbae5 | 2746 | |
2bd7c093 | 2747 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 2748 | |
d50171e4 PA |
2749 | /* If there is a thread which would otherwise be resumed, which has |
2750 | a pending status, then don't resume any threads - we can just | |
2751 | report the pending status. Make sure to queue any signals that | |
2752 | would otherwise be sent. In non-stop mode, we'll apply this | |
2753 | logic to each thread individually. We consume all pending events | |
2754 | before considering to start a step-over (in all-stop). */ | |
2755 | any_pending = 0; | |
bd99dc85 | 2756 | if (!non_stop) |
d50171e4 PA |
2757 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
2758 | ||
2759 | /* If there is a thread which would otherwise be resumed, which is | |
2760 | stopped at a breakpoint that needs stepping over, then don't | |
2761 | resume any threads - have it step over the breakpoint with all | |
2762 | other threads stopped, then resume all threads again. Make sure | |
2763 | to queue any signals that would otherwise be delivered or | |
2764 | queued. */ | |
2765 | if (!any_pending && supports_breakpoints ()) | |
2766 | need_step_over | |
2767 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2768 | need_step_over_p, NULL); | |
2769 | ||
2770 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
2771 | ||
2772 | if (debug_threads) | |
2773 | { | |
2774 | if (need_step_over != NULL) | |
2775 | fprintf (stderr, "Not resuming all, need step over\n"); | |
2776 | else if (any_pending) | |
2777 | fprintf (stderr, | |
2778 | "Not resuming, all-stop and found " | |
2779 | "an LWP with pending status\n"); | |
2780 | else | |
2781 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
2782 | } | |
2783 | ||
2784 | /* Even if we're leaving threads stopped, queue all signals we'd | |
2785 | otherwise deliver. */ | |
2786 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
2787 | ||
2788 | if (need_step_over) | |
2789 | start_step_over (need_step_over); | |
2790 | } | |
2791 | ||
2792 | /* This function is called once per thread. We check the thread's | |
2793 | last resume request, which will tell us whether to resume, step, or | |
2794 | leave the thread stopped. Any signal the client requested to be | |
2795 | delivered has already been enqueued at this point. | |
2796 | ||
2797 | If any thread that GDB wants running is stopped at an internal | |
2798 | breakpoint that needs stepping over, we start a step-over operation | |
2799 | on that particular thread, and leave all others stopped. */ | |
2800 | ||
2801 | static void | |
2802 | proceed_one_lwp (struct inferior_list_entry *entry) | |
2803 | { | |
2804 | struct lwp_info *lwp; | |
8336d594 | 2805 | struct thread_info *thread; |
d50171e4 PA |
2806 | int step; |
2807 | ||
2808 | lwp = (struct lwp_info *) entry; | |
2809 | ||
2810 | if (debug_threads) | |
2811 | fprintf (stderr, | |
2812 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
2813 | ||
2814 | if (!lwp->stopped) | |
2815 | { | |
2816 | if (debug_threads) | |
2817 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
2818 | return; | |
2819 | } | |
2820 | ||
8336d594 PA |
2821 | thread = get_lwp_thread (lwp); |
2822 | ||
2823 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
2824 | { |
2825 | if (debug_threads) | |
2826 | fprintf (stderr, " client wants LWP %ld stopped\n", lwpid_of (lwp)); | |
2827 | return; | |
2828 | } | |
2829 | ||
2830 | if (lwp->status_pending_p) | |
2831 | { | |
2832 | if (debug_threads) | |
2833 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
2834 | lwpid_of (lwp)); | |
2835 | return; | |
2836 | } | |
2837 | ||
2838 | if (lwp->suspended) | |
2839 | { | |
2840 | if (debug_threads) | |
2841 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
2842 | return; | |
2843 | } | |
2844 | ||
8336d594 | 2845 | step = thread->last_resume_kind == resume_step; |
d50171e4 PA |
2846 | linux_resume_one_lwp (lwp, step, 0, NULL); |
2847 | } | |
2848 | ||
2849 | /* When we finish a step-over, set threads running again. If there's | |
2850 | another thread that may need a step-over, now's the time to start | |
2851 | it. Eventually, we'll move all threads past their breakpoints. */ | |
2852 | ||
2853 | static void | |
2854 | proceed_all_lwps (void) | |
2855 | { | |
2856 | struct lwp_info *need_step_over; | |
2857 | ||
2858 | /* If there is a thread which would otherwise be resumed, which is | |
2859 | stopped at a breakpoint that needs stepping over, then don't | |
2860 | resume any threads - have it step over the breakpoint with all | |
2861 | other threads stopped, then resume all threads again. */ | |
2862 | ||
2863 | if (supports_breakpoints ()) | |
2864 | { | |
2865 | need_step_over | |
2866 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2867 | need_step_over_p, NULL); | |
2868 | ||
2869 | if (need_step_over != NULL) | |
2870 | { | |
2871 | if (debug_threads) | |
2872 | fprintf (stderr, "proceed_all_lwps: found " | |
2873 | "thread %ld needing a step-over\n", | |
2874 | lwpid_of (need_step_over)); | |
2875 | ||
2876 | start_step_over (need_step_over); | |
2877 | return; | |
2878 | } | |
2879 | } | |
5544ad89 | 2880 | |
d50171e4 PA |
2881 | if (debug_threads) |
2882 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
2883 | ||
2884 | for_each_inferior (&all_lwps, proceed_one_lwp); | |
2885 | } | |
2886 | ||
2887 | /* Stopped LWPs that the client wanted to be running, that don't have | |
2888 | pending statuses, are set to run again, except for EXCEPT, if not | |
2889 | NULL. This undoes a stop_all_lwps call. */ | |
2890 | ||
2891 | static void | |
2892 | unstop_all_lwps (struct lwp_info *except) | |
2893 | { | |
5544ad89 DJ |
2894 | if (debug_threads) |
2895 | { | |
d50171e4 PA |
2896 | if (except) |
2897 | fprintf (stderr, | |
2898 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 2899 | else |
d50171e4 PA |
2900 | fprintf (stderr, |
2901 | "unstopping all lwps\n"); | |
5544ad89 DJ |
2902 | } |
2903 | ||
d50171e4 PA |
2904 | /* Make sure proceed_one_lwp doesn't try to resume this thread. */ |
2905 | if (except != NULL) | |
2906 | ++except->suspended; | |
2907 | ||
2908 | for_each_inferior (&all_lwps, proceed_one_lwp); | |
2909 | ||
2910 | if (except != NULL) | |
2911 | --except->suspended; | |
0d62e5e8 DJ |
2912 | } |
2913 | ||
2914 | #ifdef HAVE_LINUX_USRREGS | |
da6d8c04 DJ |
2915 | |
2916 | int | |
0a30fbc4 | 2917 | register_addr (int regnum) |
da6d8c04 DJ |
2918 | { |
2919 | int addr; | |
2920 | ||
2ec06d2e | 2921 | if (regnum < 0 || regnum >= the_low_target.num_regs) |
da6d8c04 DJ |
2922 | error ("Invalid register number %d.", regnum); |
2923 | ||
2ec06d2e | 2924 | addr = the_low_target.regmap[regnum]; |
da6d8c04 DJ |
2925 | |
2926 | return addr; | |
2927 | } | |
2928 | ||
58caa3dc | 2929 | /* Fetch one register. */ |
da6d8c04 | 2930 | static void |
442ea881 | 2931 | fetch_register (struct regcache *regcache, int regno) |
da6d8c04 DJ |
2932 | { |
2933 | CORE_ADDR regaddr; | |
48d93c75 | 2934 | int i, size; |
0d62e5e8 | 2935 | char *buf; |
95954743 | 2936 | int pid; |
da6d8c04 | 2937 | |
2ec06d2e | 2938 | if (regno >= the_low_target.num_regs) |
0a30fbc4 | 2939 | return; |
2ec06d2e | 2940 | if ((*the_low_target.cannot_fetch_register) (regno)) |
0a30fbc4 | 2941 | return; |
da6d8c04 | 2942 | |
0a30fbc4 DJ |
2943 | regaddr = register_addr (regno); |
2944 | if (regaddr == -1) | |
2945 | return; | |
95954743 PA |
2946 | |
2947 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
1b3f6016 PA |
2948 | size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
2949 | & - sizeof (PTRACE_XFER_TYPE)); | |
48d93c75 UW |
2950 | buf = alloca (size); |
2951 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
da6d8c04 DJ |
2952 | { |
2953 | errno = 0; | |
0d62e5e8 | 2954 | *(PTRACE_XFER_TYPE *) (buf + i) = |
14ce3065 DE |
2955 | ptrace (PTRACE_PEEKUSER, pid, |
2956 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
2957 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
2958 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0); | |
da6d8c04 DJ |
2959 | regaddr += sizeof (PTRACE_XFER_TYPE); |
2960 | if (errno != 0) | |
f52cd8cd | 2961 | error ("reading register %d: %s", regno, strerror (errno)); |
da6d8c04 | 2962 | } |
ee1a7ae4 UW |
2963 | |
2964 | if (the_low_target.supply_ptrace_register) | |
442ea881 | 2965 | the_low_target.supply_ptrace_register (regcache, regno, buf); |
5a1f5858 | 2966 | else |
442ea881 | 2967 | supply_register (regcache, regno, buf); |
da6d8c04 DJ |
2968 | } |
2969 | ||
2970 | /* Fetch all registers, or just one, from the child process. */ | |
58caa3dc | 2971 | static void |
442ea881 | 2972 | usr_fetch_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 | 2973 | { |
4463ce24 | 2974 | if (regno == -1) |
2ec06d2e | 2975 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 2976 | fetch_register (regcache, regno); |
da6d8c04 | 2977 | else |
442ea881 | 2978 | fetch_register (regcache, regno); |
da6d8c04 DJ |
2979 | } |
2980 | ||
2981 | /* Store our register values back into the inferior. | |
2982 | If REGNO is -1, do this for all registers. | |
2983 | Otherwise, REGNO specifies which register (so we can save time). */ | |
58caa3dc | 2984 | static void |
442ea881 | 2985 | usr_store_inferior_registers (struct regcache *regcache, int regno) |
da6d8c04 DJ |
2986 | { |
2987 | CORE_ADDR regaddr; | |
48d93c75 | 2988 | int i, size; |
0d62e5e8 | 2989 | char *buf; |
55ac2b99 | 2990 | int pid; |
da6d8c04 DJ |
2991 | |
2992 | if (regno >= 0) | |
2993 | { | |
2ec06d2e | 2994 | if (regno >= the_low_target.num_regs) |
0a30fbc4 DJ |
2995 | return; |
2996 | ||
bc1e36ca | 2997 | if ((*the_low_target.cannot_store_register) (regno) == 1) |
0a30fbc4 DJ |
2998 | return; |
2999 | ||
3000 | regaddr = register_addr (regno); | |
3001 | if (regaddr == -1) | |
da6d8c04 | 3002 | return; |
da6d8c04 | 3003 | errno = 0; |
48d93c75 UW |
3004 | size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
3005 | & - sizeof (PTRACE_XFER_TYPE); | |
3006 | buf = alloca (size); | |
3007 | memset (buf, 0, size); | |
ee1a7ae4 UW |
3008 | |
3009 | if (the_low_target.collect_ptrace_register) | |
442ea881 | 3010 | the_low_target.collect_ptrace_register (regcache, regno, buf); |
5a1f5858 | 3011 | else |
442ea881 | 3012 | collect_register (regcache, regno, buf); |
ee1a7ae4 | 3013 | |
95954743 | 3014 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
48d93c75 | 3015 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
da6d8c04 | 3016 | { |
0a30fbc4 | 3017 | errno = 0; |
14ce3065 DE |
3018 | ptrace (PTRACE_POKEUSER, pid, |
3019 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3020 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3021 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
3022 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
da6d8c04 DJ |
3023 | if (errno != 0) |
3024 | { | |
1b3f6016 PA |
3025 | /* At this point, ESRCH should mean the process is |
3026 | already gone, in which case we simply ignore attempts | |
3027 | to change its registers. See also the related | |
3028 | comment in linux_resume_one_lwp. */ | |
3221518c UW |
3029 | if (errno == ESRCH) |
3030 | return; | |
3031 | ||
bc1e36ca | 3032 | if ((*the_low_target.cannot_store_register) (regno) == 0) |
f52cd8cd | 3033 | error ("writing register %d: %s", regno, strerror (errno)); |
da6d8c04 | 3034 | } |
2ff29de4 | 3035 | regaddr += sizeof (PTRACE_XFER_TYPE); |
da6d8c04 | 3036 | } |
da6d8c04 DJ |
3037 | } |
3038 | else | |
2ec06d2e | 3039 | for (regno = 0; regno < the_low_target.num_regs; regno++) |
442ea881 | 3040 | usr_store_inferior_registers (regcache, regno); |
da6d8c04 | 3041 | } |
58caa3dc DJ |
3042 | #endif /* HAVE_LINUX_USRREGS */ |
3043 | ||
3044 | ||
3045 | ||
3046 | #ifdef HAVE_LINUX_REGSETS | |
3047 | ||
3048 | static int | |
442ea881 | 3049 | regsets_fetch_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3050 | { |
3051 | struct regset_info *regset; | |
e9d25b98 | 3052 | int saw_general_regs = 0; |
95954743 | 3053 | int pid; |
1570b33e | 3054 | struct iovec iov; |
58caa3dc DJ |
3055 | |
3056 | regset = target_regsets; | |
3057 | ||
95954743 | 3058 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3059 | while (regset->size >= 0) |
3060 | { | |
1570b33e L |
3061 | void *buf, *data; |
3062 | int nt_type, res; | |
58caa3dc | 3063 | |
52fa2412 | 3064 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3065 | { |
3066 | regset ++; | |
3067 | continue; | |
3068 | } | |
3069 | ||
bca929d3 | 3070 | buf = xmalloc (regset->size); |
1570b33e L |
3071 | |
3072 | nt_type = regset->nt_type; | |
3073 | if (nt_type) | |
3074 | { | |
3075 | iov.iov_base = buf; | |
3076 | iov.iov_len = regset->size; | |
3077 | data = (void *) &iov; | |
3078 | } | |
3079 | else | |
3080 | data = buf; | |
3081 | ||
dfb64f85 | 3082 | #ifndef __sparc__ |
1570b33e | 3083 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3084 | #else |
1570b33e | 3085 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 3086 | #endif |
58caa3dc DJ |
3087 | if (res < 0) |
3088 | { | |
3089 | if (errno == EIO) | |
3090 | { | |
52fa2412 UW |
3091 | /* If we get EIO on a regset, do not try it again for |
3092 | this process. */ | |
3093 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3094 | free (buf); |
52fa2412 | 3095 | continue; |
58caa3dc DJ |
3096 | } |
3097 | else | |
3098 | { | |
0d62e5e8 | 3099 | char s[256]; |
95954743 PA |
3100 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
3101 | pid); | |
0d62e5e8 | 3102 | perror (s); |
58caa3dc DJ |
3103 | } |
3104 | } | |
e9d25b98 DJ |
3105 | else if (regset->type == GENERAL_REGS) |
3106 | saw_general_regs = 1; | |
442ea881 | 3107 | regset->store_function (regcache, buf); |
58caa3dc | 3108 | regset ++; |
fdeb2a12 | 3109 | free (buf); |
58caa3dc | 3110 | } |
e9d25b98 DJ |
3111 | if (saw_general_regs) |
3112 | return 0; | |
3113 | else | |
3114 | return 1; | |
58caa3dc DJ |
3115 | } |
3116 | ||
3117 | static int | |
442ea881 | 3118 | regsets_store_inferior_registers (struct regcache *regcache) |
58caa3dc DJ |
3119 | { |
3120 | struct regset_info *regset; | |
e9d25b98 | 3121 | int saw_general_regs = 0; |
95954743 | 3122 | int pid; |
1570b33e | 3123 | struct iovec iov; |
58caa3dc DJ |
3124 | |
3125 | regset = target_regsets; | |
3126 | ||
95954743 | 3127 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
3128 | while (regset->size >= 0) |
3129 | { | |
1570b33e L |
3130 | void *buf, *data; |
3131 | int nt_type, res; | |
58caa3dc | 3132 | |
52fa2412 | 3133 | if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
58caa3dc DJ |
3134 | { |
3135 | regset ++; | |
3136 | continue; | |
3137 | } | |
3138 | ||
bca929d3 | 3139 | buf = xmalloc (regset->size); |
545587ee DJ |
3140 | |
3141 | /* First fill the buffer with the current register set contents, | |
3142 | in case there are any items in the kernel's regset that are | |
3143 | not in gdbserver's regcache. */ | |
1570b33e L |
3144 | |
3145 | nt_type = regset->nt_type; | |
3146 | if (nt_type) | |
3147 | { | |
3148 | iov.iov_base = buf; | |
3149 | iov.iov_len = regset->size; | |
3150 | data = (void *) &iov; | |
3151 | } | |
3152 | else | |
3153 | data = buf; | |
3154 | ||
dfb64f85 | 3155 | #ifndef __sparc__ |
1570b33e | 3156 | res = ptrace (regset->get_request, pid, nt_type, data); |
dfb64f85 | 3157 | #else |
1570b33e | 3158 | res = ptrace (regset->get_request, pid, &iov, data); |
dfb64f85 | 3159 | #endif |
545587ee DJ |
3160 | |
3161 | if (res == 0) | |
3162 | { | |
3163 | /* Then overlay our cached registers on that. */ | |
442ea881 | 3164 | regset->fill_function (regcache, buf); |
545587ee DJ |
3165 | |
3166 | /* Only now do we write the register set. */ | |
dfb64f85 | 3167 | #ifndef __sparc__ |
1570b33e | 3168 | res = ptrace (regset->set_request, pid, nt_type, data); |
dfb64f85 | 3169 | #else |
1570b33e | 3170 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 3171 | #endif |
545587ee DJ |
3172 | } |
3173 | ||
58caa3dc DJ |
3174 | if (res < 0) |
3175 | { | |
3176 | if (errno == EIO) | |
3177 | { | |
52fa2412 UW |
3178 | /* If we get EIO on a regset, do not try it again for |
3179 | this process. */ | |
3180 | disabled_regsets[regset - target_regsets] = 1; | |
fdeb2a12 | 3181 | free (buf); |
52fa2412 | 3182 | continue; |
58caa3dc | 3183 | } |
3221518c UW |
3184 | else if (errno == ESRCH) |
3185 | { | |
1b3f6016 PA |
3186 | /* At this point, ESRCH should mean the process is |
3187 | already gone, in which case we simply ignore attempts | |
3188 | to change its registers. See also the related | |
3189 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 3190 | free (buf); |
3221518c UW |
3191 | return 0; |
3192 | } | |
58caa3dc DJ |
3193 | else |
3194 | { | |
ce3a066d | 3195 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
3196 | } |
3197 | } | |
e9d25b98 DJ |
3198 | else if (regset->type == GENERAL_REGS) |
3199 | saw_general_regs = 1; | |
58caa3dc | 3200 | regset ++; |
09ec9b38 | 3201 | free (buf); |
58caa3dc | 3202 | } |
e9d25b98 DJ |
3203 | if (saw_general_regs) |
3204 | return 0; | |
3205 | else | |
3206 | return 1; | |
ce3a066d | 3207 | return 0; |
58caa3dc DJ |
3208 | } |
3209 | ||
3210 | #endif /* HAVE_LINUX_REGSETS */ | |
3211 | ||
3212 | ||
3213 | void | |
442ea881 | 3214 | linux_fetch_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3215 | { |
3216 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3217 | if (regsets_fetch_inferior_registers (regcache) == 0) |
52fa2412 | 3218 | return; |
58caa3dc DJ |
3219 | #endif |
3220 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3221 | usr_fetch_inferior_registers (regcache, regno); |
58caa3dc DJ |
3222 | #endif |
3223 | } | |
3224 | ||
3225 | void | |
442ea881 | 3226 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc DJ |
3227 | { |
3228 | #ifdef HAVE_LINUX_REGSETS | |
442ea881 | 3229 | if (regsets_store_inferior_registers (regcache) == 0) |
52fa2412 | 3230 | return; |
58caa3dc DJ |
3231 | #endif |
3232 | #ifdef HAVE_LINUX_USRREGS | |
442ea881 | 3233 | usr_store_inferior_registers (regcache, regno); |
58caa3dc DJ |
3234 | #endif |
3235 | } | |
3236 | ||
da6d8c04 | 3237 | |
da6d8c04 DJ |
3238 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
3239 | to debugger memory starting at MYADDR. */ | |
3240 | ||
c3e735a6 | 3241 | static int |
f450004a | 3242 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 DJ |
3243 | { |
3244 | register int i; | |
3245 | /* Round starting address down to longword boundary. */ | |
3246 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
3247 | /* Round ending address up; get number of longwords that makes. */ | |
aa691b87 RM |
3248 | register int count |
3249 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
da6d8c04 DJ |
3250 | / sizeof (PTRACE_XFER_TYPE); |
3251 | /* Allocate buffer of that many longwords. */ | |
aa691b87 | 3252 | register PTRACE_XFER_TYPE *buffer |
da6d8c04 | 3253 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
fd462a61 DJ |
3254 | int fd; |
3255 | char filename[64]; | |
95954743 | 3256 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
fd462a61 DJ |
3257 | |
3258 | /* Try using /proc. Don't bother for one word. */ | |
3259 | if (len >= 3 * sizeof (long)) | |
3260 | { | |
3261 | /* We could keep this file open and cache it - possibly one per | |
3262 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 3263 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
3264 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
3265 | if (fd == -1) | |
3266 | goto no_proc; | |
3267 | ||
3268 | /* If pread64 is available, use it. It's faster if the kernel | |
3269 | supports it (only one syscall), and it's 64-bit safe even on | |
3270 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
3271 | application). */ | |
3272 | #ifdef HAVE_PREAD64 | |
3273 | if (pread64 (fd, myaddr, len, memaddr) != len) | |
3274 | #else | |
1de1badb | 3275 | if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len) |
fd462a61 DJ |
3276 | #endif |
3277 | { | |
3278 | close (fd); | |
3279 | goto no_proc; | |
3280 | } | |
3281 | ||
3282 | close (fd); | |
3283 | return 0; | |
3284 | } | |
da6d8c04 | 3285 | |
fd462a61 | 3286 | no_proc: |
da6d8c04 DJ |
3287 | /* Read all the longwords */ |
3288 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
3289 | { | |
c3e735a6 | 3290 | errno = 0; |
14ce3065 DE |
3291 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
3292 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3293 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
3294 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
c3e735a6 DJ |
3295 | if (errno) |
3296 | return errno; | |
da6d8c04 DJ |
3297 | } |
3298 | ||
3299 | /* Copy appropriate bytes out of the buffer. */ | |
1b3f6016 PA |
3300 | memcpy (myaddr, |
3301 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
3302 | len); | |
c3e735a6 DJ |
3303 | |
3304 | return 0; | |
da6d8c04 DJ |
3305 | } |
3306 | ||
93ae6fdc PA |
3307 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
3308 | memory at MEMADDR. On failure (cannot write to the inferior) | |
da6d8c04 DJ |
3309 | returns the value of errno. */ |
3310 | ||
ce3a066d | 3311 | static int |
f450004a | 3312 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
3313 | { |
3314 | register int i; | |
3315 | /* Round starting address down to longword boundary. */ | |
3316 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
3317 | /* Round ending address up; get number of longwords that makes. */ | |
3318 | register int count | |
3319 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); | |
3320 | /* Allocate buffer of that many longwords. */ | |
3321 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
95954743 | 3322 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 3323 | |
0d62e5e8 DJ |
3324 | if (debug_threads) |
3325 | { | |
58d6951d DJ |
3326 | /* Dump up to four bytes. */ |
3327 | unsigned int val = * (unsigned int *) myaddr; | |
3328 | if (len == 1) | |
3329 | val = val & 0xff; | |
3330 | else if (len == 2) | |
3331 | val = val & 0xffff; | |
3332 | else if (len == 3) | |
3333 | val = val & 0xffffff; | |
3334 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
3335 | val, (long)memaddr); | |
0d62e5e8 DJ |
3336 | } |
3337 | ||
da6d8c04 DJ |
3338 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
3339 | ||
93ae6fdc | 3340 | errno = 0; |
14ce3065 DE |
3341 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
3342 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3343 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
3344 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0); | |
93ae6fdc PA |
3345 | if (errno) |
3346 | return errno; | |
da6d8c04 DJ |
3347 | |
3348 | if (count > 1) | |
3349 | { | |
93ae6fdc | 3350 | errno = 0; |
da6d8c04 | 3351 | buffer[count - 1] |
95954743 | 3352 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
3353 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3354 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3355 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
3356 | * sizeof (PTRACE_XFER_TYPE)), | |
d844cde6 | 3357 | 0); |
93ae6fdc PA |
3358 | if (errno) |
3359 | return errno; | |
da6d8c04 DJ |
3360 | } |
3361 | ||
93ae6fdc | 3362 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 DJ |
3363 | |
3364 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); | |
3365 | ||
3366 | /* Write the entire buffer. */ | |
3367 | ||
3368 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
3369 | { | |
3370 | errno = 0; | |
14ce3065 DE |
3371 | ptrace (PTRACE_POKETEXT, pid, |
3372 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
3373 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
3374 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
3375 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
3376 | if (errno) |
3377 | return errno; | |
3378 | } | |
3379 | ||
3380 | return 0; | |
3381 | } | |
2f2893d9 | 3382 | |
6076632b | 3383 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
3384 | static int linux_supports_tracefork_flag; |
3385 | ||
51c2684e | 3386 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 3387 | |
51c2684e DJ |
3388 | static int |
3389 | linux_tracefork_grandchild (void *arg) | |
3390 | { | |
3391 | _exit (0); | |
3392 | } | |
3393 | ||
7407e2de AS |
3394 | #define STACK_SIZE 4096 |
3395 | ||
51c2684e DJ |
3396 | static int |
3397 | linux_tracefork_child (void *arg) | |
24a09b5f DJ |
3398 | { |
3399 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
3400 | kill (getpid (), SIGSTOP); | |
e4b7f41c JK |
3401 | |
3402 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
3403 | ||
3404 | if (fork () == 0) | |
3405 | linux_tracefork_grandchild (NULL); | |
3406 | ||
3407 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3408 | ||
7407e2de AS |
3409 | #ifdef __ia64__ |
3410 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
3411 | CLONE_VM | SIGCHLD, NULL); | |
3412 | #else | |
3413 | clone (linux_tracefork_grandchild, arg + STACK_SIZE, | |
3414 | CLONE_VM | SIGCHLD, NULL); | |
3415 | #endif | |
e4b7f41c JK |
3416 | |
3417 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3418 | ||
24a09b5f DJ |
3419 | _exit (0); |
3420 | } | |
3421 | ||
24a09b5f DJ |
3422 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
3423 | sure that we can enable the option, and that it had the desired | |
3424 | effect. */ | |
3425 | ||
3426 | static void | |
3427 | linux_test_for_tracefork (void) | |
3428 | { | |
3429 | int child_pid, ret, status; | |
3430 | long second_pid; | |
e4b7f41c | 3431 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 3432 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 3433 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
3434 | |
3435 | linux_supports_tracefork_flag = 0; | |
3436 | ||
e4b7f41c JK |
3437 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
3438 | ||
3439 | child_pid = fork (); | |
3440 | if (child_pid == 0) | |
3441 | linux_tracefork_child (NULL); | |
3442 | ||
3443 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3444 | ||
51c2684e | 3445 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
3446 | #ifdef __ia64__ |
3447 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
3448 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 3449 | #else /* !__ia64__ */ |
7407e2de AS |
3450 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
3451 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
3452 | #endif /* !__ia64__ */ |
3453 | ||
3454 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
3455 | ||
24a09b5f | 3456 | if (child_pid == -1) |
51c2684e | 3457 | perror_with_name ("clone"); |
24a09b5f DJ |
3458 | |
3459 | ret = my_waitpid (child_pid, &status, 0); | |
3460 | if (ret == -1) | |
3461 | perror_with_name ("waitpid"); | |
3462 | else if (ret != child_pid) | |
3463 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
3464 | if (! WIFSTOPPED (status)) | |
3465 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
3466 | ||
14ce3065 DE |
3467 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, |
3468 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); | |
24a09b5f DJ |
3469 | if (ret != 0) |
3470 | { | |
3471 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
3472 | if (ret != 0) | |
3473 | { | |
3474 | warning ("linux_test_for_tracefork: failed to kill child"); | |
3475 | return; | |
3476 | } | |
3477 | ||
3478 | ret = my_waitpid (child_pid, &status, 0); | |
3479 | if (ret != child_pid) | |
3480 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
3481 | else if (!WIFSIGNALED (status)) | |
3482 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
3483 | "killed child", status); | |
3484 | ||
3485 | return; | |
3486 | } | |
3487 | ||
3488 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); | |
3489 | if (ret != 0) | |
3490 | warning ("linux_test_for_tracefork: failed to resume child"); | |
3491 | ||
3492 | ret = my_waitpid (child_pid, &status, 0); | |
3493 | ||
3494 | if (ret == child_pid && WIFSTOPPED (status) | |
3495 | && status >> 16 == PTRACE_EVENT_FORK) | |
3496 | { | |
3497 | second_pid = 0; | |
3498 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
3499 | if (ret == 0 && second_pid != 0) | |
3500 | { | |
3501 | int second_status; | |
3502 | ||
3503 | linux_supports_tracefork_flag = 1; | |
3504 | my_waitpid (second_pid, &second_status, 0); | |
3505 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
3506 | if (ret != 0) | |
3507 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
3508 | my_waitpid (second_pid, &status, 0); | |
3509 | } | |
3510 | } | |
3511 | else | |
3512 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
3513 | "(%d, status 0x%x)", ret, status); | |
3514 | ||
3515 | do | |
3516 | { | |
3517 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); | |
3518 | if (ret != 0) | |
3519 | warning ("linux_test_for_tracefork: failed to kill child"); | |
3520 | my_waitpid (child_pid, &status, 0); | |
3521 | } | |
3522 | while (WIFSTOPPED (status)); | |
51c2684e | 3523 | |
e4b7f41c | 3524 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 3525 | free (stack); |
e4b7f41c | 3526 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
3527 | } |
3528 | ||
3529 | ||
2f2893d9 DJ |
3530 | static void |
3531 | linux_look_up_symbols (void) | |
3532 | { | |
0d62e5e8 | 3533 | #ifdef USE_THREAD_DB |
95954743 PA |
3534 | struct process_info *proc = current_process (); |
3535 | ||
cdbfd419 | 3536 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
3537 | return; |
3538 | ||
6076632b DE |
3539 | /* If the kernel supports tracing forks then it also supports tracing |
3540 | clones, and then we don't need to use the magic thread event breakpoint | |
3541 | to learn about threads. */ | |
cdbfd419 | 3542 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
3543 | #endif |
3544 | } | |
3545 | ||
e5379b03 | 3546 | static void |
ef57601b | 3547 | linux_request_interrupt (void) |
e5379b03 | 3548 | { |
a1928bad | 3549 | extern unsigned long signal_pid; |
e5379b03 | 3550 | |
95954743 PA |
3551 | if (!ptid_equal (cont_thread, null_ptid) |
3552 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 3553 | { |
54a0b537 | 3554 | struct lwp_info *lwp; |
bd99dc85 | 3555 | int lwpid; |
e5379b03 | 3556 | |
54a0b537 | 3557 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
3558 | lwpid = lwpid_of (lwp); |
3559 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
3560 | } |
3561 | else | |
ef57601b | 3562 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
3563 | } |
3564 | ||
aa691b87 RM |
3565 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
3566 | to debugger memory starting at MYADDR. */ | |
3567 | ||
3568 | static int | |
f450004a | 3569 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
3570 | { |
3571 | char filename[PATH_MAX]; | |
3572 | int fd, n; | |
95954743 | 3573 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 3574 | |
95954743 | 3575 | snprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
3576 | |
3577 | fd = open (filename, O_RDONLY); | |
3578 | if (fd < 0) | |
3579 | return -1; | |
3580 | ||
3581 | if (offset != (CORE_ADDR) 0 | |
3582 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
3583 | n = -1; | |
3584 | else | |
3585 | n = read (fd, myaddr, len); | |
3586 | ||
3587 | close (fd); | |
3588 | ||
3589 | return n; | |
3590 | } | |
3591 | ||
d993e290 PA |
3592 | /* These breakpoint and watchpoint related wrapper functions simply |
3593 | pass on the function call if the target has registered a | |
3594 | corresponding function. */ | |
e013ee27 OF |
3595 | |
3596 | static int | |
d993e290 | 3597 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 3598 | { |
d993e290 PA |
3599 | if (the_low_target.insert_point != NULL) |
3600 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
3601 | else |
3602 | /* Unsupported (see target.h). */ | |
3603 | return 1; | |
3604 | } | |
3605 | ||
3606 | static int | |
d993e290 | 3607 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 3608 | { |
d993e290 PA |
3609 | if (the_low_target.remove_point != NULL) |
3610 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
3611 | else |
3612 | /* Unsupported (see target.h). */ | |
3613 | return 1; | |
3614 | } | |
3615 | ||
3616 | static int | |
3617 | linux_stopped_by_watchpoint (void) | |
3618 | { | |
c3adc08c PA |
3619 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
3620 | ||
3621 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
3622 | } |
3623 | ||
3624 | static CORE_ADDR | |
3625 | linux_stopped_data_address (void) | |
3626 | { | |
c3adc08c PA |
3627 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
3628 | ||
3629 | return lwp->stopped_data_address; | |
e013ee27 OF |
3630 | } |
3631 | ||
42c81e2a | 3632 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
3633 | #if defined(__mcoldfire__) |
3634 | /* These should really be defined in the kernel's ptrace.h header. */ | |
3635 | #define PT_TEXT_ADDR 49*4 | |
3636 | #define PT_DATA_ADDR 50*4 | |
3637 | #define PT_TEXT_END_ADDR 51*4 | |
3638 | #endif | |
3639 | ||
3640 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
3641 | to tell gdb about. */ | |
3642 | ||
3643 | static int | |
3644 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
3645 | { | |
3646 | #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) | |
3647 | unsigned long text, text_end, data; | |
bd99dc85 | 3648 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
3649 | |
3650 | errno = 0; | |
3651 | ||
3652 | text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); | |
3653 | text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); | |
3654 | data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); | |
3655 | ||
3656 | if (errno == 0) | |
3657 | { | |
3658 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
3659 | used by gdb) are relative to the beginning of the program, |
3660 | with the data segment immediately following the text segment. | |
3661 | However, the actual runtime layout in memory may put the data | |
3662 | somewhere else, so when we send gdb a data base-address, we | |
3663 | use the real data base address and subtract the compile-time | |
3664 | data base-address from it (which is just the length of the | |
3665 | text segment). BSS immediately follows data in both | |
3666 | cases. */ | |
52fb6437 NS |
3667 | *text_p = text; |
3668 | *data_p = data - (text_end - text); | |
1b3f6016 | 3669 | |
52fb6437 NS |
3670 | return 1; |
3671 | } | |
3672 | #endif | |
3673 | return 0; | |
3674 | } | |
3675 | #endif | |
3676 | ||
dc146f7c VP |
3677 | static int |
3678 | compare_ints (const void *xa, const void *xb) | |
3679 | { | |
3680 | int a = *(const int *)xa; | |
3681 | int b = *(const int *)xb; | |
3682 | ||
3683 | return a - b; | |
3684 | } | |
3685 | ||
3686 | static int * | |
3687 | unique (int *b, int *e) | |
3688 | { | |
3689 | int *d = b; | |
3690 | while (++b != e) | |
3691 | if (*d != *b) | |
3692 | *++d = *b; | |
3693 | return ++d; | |
3694 | } | |
3695 | ||
3696 | /* Given PID, iterates over all threads in that process. | |
3697 | ||
3698 | Information about each thread, in a format suitable for qXfer:osdata:thread | |
3699 | is printed to BUFFER, if it's not NULL. BUFFER is assumed to be already | |
3700 | initialized, and the caller is responsible for finishing and appending '\0' | |
3701 | to it. | |
3702 | ||
3703 | The list of cores that threads are running on is assigned to *CORES, if it | |
3704 | is not NULL. If no cores are found, *CORES will be set to NULL. Caller | |
3705 | should free *CORES. */ | |
3706 | ||
3707 | static void | |
3708 | list_threads (int pid, struct buffer *buffer, char **cores) | |
3709 | { | |
3710 | int count = 0; | |
3711 | int allocated = 10; | |
3712 | int *core_numbers = xmalloc (sizeof (int) * allocated); | |
3713 | char pathname[128]; | |
3714 | DIR *dir; | |
3715 | struct dirent *dp; | |
3716 | struct stat statbuf; | |
3717 | ||
3718 | sprintf (pathname, "/proc/%d/task", pid); | |
3719 | if (stat (pathname, &statbuf) == 0 && S_ISDIR (statbuf.st_mode)) | |
3720 | { | |
3721 | dir = opendir (pathname); | |
3722 | if (!dir) | |
3723 | { | |
3724 | free (core_numbers); | |
3725 | return; | |
3726 | } | |
3727 | ||
3728 | while ((dp = readdir (dir)) != NULL) | |
3729 | { | |
3730 | unsigned long lwp = strtoul (dp->d_name, NULL, 10); | |
3731 | ||
3732 | if (lwp != 0) | |
3733 | { | |
3734 | unsigned core = linux_core_of_thread (ptid_build (pid, lwp, 0)); | |
3735 | ||
3736 | if (core != -1) | |
3737 | { | |
3738 | char s[sizeof ("4294967295")]; | |
3739 | sprintf (s, "%u", core); | |
3740 | ||
3741 | if (count == allocated) | |
3742 | { | |
3743 | allocated *= 2; | |
3744 | core_numbers = realloc (core_numbers, | |
3745 | sizeof (int) * allocated); | |
3746 | } | |
3747 | core_numbers[count++] = core; | |
3748 | if (buffer) | |
3749 | buffer_xml_printf (buffer, | |
3750 | "<item>" | |
3751 | "<column name=\"pid\">%d</column>" | |
3752 | "<column name=\"tid\">%s</column>" | |
3753 | "<column name=\"core\">%s</column>" | |
3754 | "</item>", pid, dp->d_name, s); | |
3755 | } | |
3756 | else | |
3757 | { | |
3758 | if (buffer) | |
3759 | buffer_xml_printf (buffer, | |
3760 | "<item>" | |
3761 | "<column name=\"pid\">%d</column>" | |
3762 | "<column name=\"tid\">%s</column>" | |
3763 | "</item>", pid, dp->d_name); | |
3764 | } | |
3765 | } | |
3766 | } | |
3767 | } | |
3768 | ||
3769 | if (cores) | |
3770 | { | |
3771 | *cores = NULL; | |
3772 | if (count > 0) | |
3773 | { | |
3774 | struct buffer buffer2; | |
3775 | int *b; | |
3776 | int *e; | |
3777 | qsort (core_numbers, count, sizeof (int), compare_ints); | |
3778 | ||
3779 | /* Remove duplicates. */ | |
3780 | b = core_numbers; | |
3781 | e = unique (b, core_numbers + count); | |
3782 | ||
3783 | buffer_init (&buffer2); | |
3784 | ||
3785 | for (b = core_numbers; b != e; ++b) | |
3786 | { | |
3787 | char number[sizeof ("4294967295")]; | |
3788 | sprintf (number, "%u", *b); | |
3789 | buffer_xml_printf (&buffer2, "%s%s", | |
3790 | (b == core_numbers) ? "" : ",", number); | |
3791 | } | |
3792 | buffer_grow_str0 (&buffer2, ""); | |
3793 | ||
3794 | *cores = buffer_finish (&buffer2); | |
3795 | } | |
3796 | } | |
3797 | free (core_numbers); | |
3798 | } | |
3799 | ||
3800 | static void | |
3801 | show_process (int pid, const char *username, struct buffer *buffer) | |
3802 | { | |
3803 | char pathname[128]; | |
3804 | FILE *f; | |
3805 | char cmd[MAXPATHLEN + 1]; | |
3806 | ||
3807 | sprintf (pathname, "/proc/%d/cmdline", pid); | |
3808 | ||
3809 | if ((f = fopen (pathname, "r")) != NULL) | |
3810 | { | |
3811 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
3812 | if (len > 0) | |
3813 | { | |
3814 | char *cores = 0; | |
3815 | int i; | |
3816 | for (i = 0; i < len; i++) | |
3817 | if (cmd[i] == '\0') | |
3818 | cmd[i] = ' '; | |
3819 | cmd[len] = '\0'; | |
3820 | ||
3821 | buffer_xml_printf (buffer, | |
3822 | "<item>" | |
3823 | "<column name=\"pid\">%d</column>" | |
3824 | "<column name=\"user\">%s</column>" | |
3825 | "<column name=\"command\">%s</column>", | |
3826 | pid, | |
3827 | username, | |
3828 | cmd); | |
3829 | ||
3830 | /* This only collects core numbers, and does not print threads. */ | |
3831 | list_threads (pid, NULL, &cores); | |
3832 | ||
3833 | if (cores) | |
3834 | { | |
3835 | buffer_xml_printf (buffer, | |
3836 | "<column name=\"cores\">%s</column>", cores); | |
3837 | free (cores); | |
3838 | } | |
3839 | ||
3840 | buffer_xml_printf (buffer, "</item>"); | |
3841 | } | |
3842 | fclose (f); | |
3843 | } | |
3844 | } | |
3845 | ||
07e059b5 VP |
3846 | static int |
3847 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
3848 | unsigned char *readbuf, unsigned const char *writebuf, |
3849 | CORE_ADDR offset, int len) | |
07e059b5 VP |
3850 | { |
3851 | /* We make the process list snapshot when the object starts to be | |
3852 | read. */ | |
3853 | static const char *buf; | |
3854 | static long len_avail = -1; | |
3855 | static struct buffer buffer; | |
dc146f7c VP |
3856 | int processes = 0; |
3857 | int threads = 0; | |
07e059b5 VP |
3858 | |
3859 | DIR *dirp; | |
3860 | ||
dc146f7c VP |
3861 | if (strcmp (annex, "processes") == 0) |
3862 | processes = 1; | |
3863 | else if (strcmp (annex, "threads") == 0) | |
3864 | threads = 1; | |
3865 | else | |
07e059b5 VP |
3866 | return 0; |
3867 | ||
3868 | if (!readbuf || writebuf) | |
3869 | return 0; | |
3870 | ||
3871 | if (offset == 0) | |
3872 | { | |
3873 | if (len_avail != -1 && len_avail != 0) | |
3874 | buffer_free (&buffer); | |
3875 | len_avail = 0; | |
3876 | buf = NULL; | |
3877 | buffer_init (&buffer); | |
dc146f7c VP |
3878 | if (processes) |
3879 | buffer_grow_str (&buffer, "<osdata type=\"processes\">"); | |
3880 | else if (threads) | |
3881 | buffer_grow_str (&buffer, "<osdata type=\"threads\">"); | |
07e059b5 VP |
3882 | |
3883 | dirp = opendir ("/proc"); | |
3884 | if (dirp) | |
3885 | { | |
1b3f6016 PA |
3886 | struct dirent *dp; |
3887 | while ((dp = readdir (dirp)) != NULL) | |
3888 | { | |
3889 | struct stat statbuf; | |
3890 | char procentry[sizeof ("/proc/4294967295")]; | |
3891 | ||
3892 | if (!isdigit (dp->d_name[0]) | |
3893 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
3894 | continue; | |
3895 | ||
3896 | sprintf (procentry, "/proc/%s", dp->d_name); | |
3897 | if (stat (procentry, &statbuf) == 0 | |
3898 | && S_ISDIR (statbuf.st_mode)) | |
3899 | { | |
dc146f7c | 3900 | int pid = (int) strtoul (dp->d_name, NULL, 10); |
1b3f6016 | 3901 | |
dc146f7c | 3902 | if (processes) |
1b3f6016 | 3903 | { |
dc146f7c VP |
3904 | struct passwd *entry = getpwuid (statbuf.st_uid); |
3905 | show_process (pid, entry ? entry->pw_name : "?", &buffer); | |
3906 | } | |
3907 | else if (threads) | |
3908 | { | |
3909 | list_threads (pid, &buffer, NULL); | |
1b3f6016 PA |
3910 | } |
3911 | } | |
3912 | } | |
07e059b5 | 3913 | |
1b3f6016 | 3914 | closedir (dirp); |
07e059b5 VP |
3915 | } |
3916 | buffer_grow_str0 (&buffer, "</osdata>\n"); | |
3917 | buf = buffer_finish (&buffer); | |
3918 | len_avail = strlen (buf); | |
3919 | } | |
3920 | ||
3921 | if (offset >= len_avail) | |
3922 | { | |
3923 | /* Done. Get rid of the data. */ | |
3924 | buffer_free (&buffer); | |
3925 | buf = NULL; | |
3926 | len_avail = 0; | |
3927 | return 0; | |
3928 | } | |
3929 | ||
3930 | if (len > len_avail - offset) | |
3931 | len = len_avail - offset; | |
3932 | memcpy (readbuf, buf + offset, len); | |
3933 | ||
3934 | return len; | |
3935 | } | |
3936 | ||
d0722149 DE |
3937 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3938 | layout of the inferiors' architecture. */ | |
3939 | ||
3940 | static void | |
3941 | siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction) | |
3942 | { | |
3943 | int done = 0; | |
3944 | ||
3945 | if (the_low_target.siginfo_fixup != NULL) | |
3946 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
3947 | ||
3948 | /* If there was no callback, or the callback didn't do anything, | |
3949 | then just do a straight memcpy. */ | |
3950 | if (!done) | |
3951 | { | |
3952 | if (direction == 1) | |
3953 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3954 | else | |
3955 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3956 | } | |
3957 | } | |
3958 | ||
4aa995e1 PA |
3959 | static int |
3960 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
3961 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
3962 | { | |
d0722149 | 3963 | int pid; |
4aa995e1 | 3964 | struct siginfo siginfo; |
d0722149 | 3965 | char inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3966 | |
3967 | if (current_inferior == NULL) | |
3968 | return -1; | |
3969 | ||
bd99dc85 | 3970 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
3971 | |
3972 | if (debug_threads) | |
d0722149 | 3973 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
3974 | readbuf != NULL ? "Reading" : "Writing", |
3975 | pid); | |
3976 | ||
3977 | if (offset > sizeof (siginfo)) | |
3978 | return -1; | |
3979 | ||
3980 | if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0) | |
3981 | return -1; | |
3982 | ||
d0722149 DE |
3983 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
3984 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3985 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
3986 | with a 32-bit GDBSERVER, we need to convert it. */ | |
3987 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3988 | ||
4aa995e1 PA |
3989 | if (offset + len > sizeof (siginfo)) |
3990 | len = sizeof (siginfo) - offset; | |
3991 | ||
3992 | if (readbuf != NULL) | |
d0722149 | 3993 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3994 | else |
3995 | { | |
d0722149 DE |
3996 | memcpy (inf_siginfo + offset, writebuf, len); |
3997 | ||
3998 | /* Convert back to ptrace layout before flushing it out. */ | |
3999 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4000 | ||
4aa995e1 PA |
4001 | if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0) |
4002 | return -1; | |
4003 | } | |
4004 | ||
4005 | return len; | |
4006 | } | |
4007 | ||
bd99dc85 PA |
4008 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4009 | so we notice when children change state; as the handler for the | |
4010 | sigsuspend in my_waitpid. */ | |
4011 | ||
4012 | static void | |
4013 | sigchld_handler (int signo) | |
4014 | { | |
4015 | int old_errno = errno; | |
4016 | ||
4017 | if (debug_threads) | |
4018 | /* fprintf is not async-signal-safe, so call write directly. */ | |
4019 | write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1); | |
4020 | ||
4021 | if (target_is_async_p ()) | |
4022 | async_file_mark (); /* trigger a linux_wait */ | |
4023 | ||
4024 | errno = old_errno; | |
4025 | } | |
4026 | ||
4027 | static int | |
4028 | linux_supports_non_stop (void) | |
4029 | { | |
4030 | return 1; | |
4031 | } | |
4032 | ||
4033 | static int | |
4034 | linux_async (int enable) | |
4035 | { | |
4036 | int previous = (linux_event_pipe[0] != -1); | |
4037 | ||
8336d594 PA |
4038 | if (debug_threads) |
4039 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4040 | enable, previous); | |
4041 | ||
bd99dc85 PA |
4042 | if (previous != enable) |
4043 | { | |
4044 | sigset_t mask; | |
4045 | sigemptyset (&mask); | |
4046 | sigaddset (&mask, SIGCHLD); | |
4047 | ||
4048 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4049 | ||
4050 | if (enable) | |
4051 | { | |
4052 | if (pipe (linux_event_pipe) == -1) | |
4053 | fatal ("creating event pipe failed."); | |
4054 | ||
4055 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4056 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4057 | ||
4058 | /* Register the event loop handler. */ | |
4059 | add_file_handler (linux_event_pipe[0], | |
4060 | handle_target_event, NULL); | |
4061 | ||
4062 | /* Always trigger a linux_wait. */ | |
4063 | async_file_mark (); | |
4064 | } | |
4065 | else | |
4066 | { | |
4067 | delete_file_handler (linux_event_pipe[0]); | |
4068 | ||
4069 | close (linux_event_pipe[0]); | |
4070 | close (linux_event_pipe[1]); | |
4071 | linux_event_pipe[0] = -1; | |
4072 | linux_event_pipe[1] = -1; | |
4073 | } | |
4074 | ||
4075 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4076 | } | |
4077 | ||
4078 | return previous; | |
4079 | } | |
4080 | ||
4081 | static int | |
4082 | linux_start_non_stop (int nonstop) | |
4083 | { | |
4084 | /* Register or unregister from event-loop accordingly. */ | |
4085 | linux_async (nonstop); | |
4086 | return 0; | |
4087 | } | |
4088 | ||
cf8fd78b PA |
4089 | static int |
4090 | linux_supports_multi_process (void) | |
4091 | { | |
4092 | return 1; | |
4093 | } | |
4094 | ||
efcbbd14 UW |
4095 | |
4096 | /* Enumerate spufs IDs for process PID. */ | |
4097 | static int | |
4098 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
4099 | { | |
4100 | int pos = 0; | |
4101 | int written = 0; | |
4102 | char path[128]; | |
4103 | DIR *dir; | |
4104 | struct dirent *entry; | |
4105 | ||
4106 | sprintf (path, "/proc/%ld/fd", pid); | |
4107 | dir = opendir (path); | |
4108 | if (!dir) | |
4109 | return -1; | |
4110 | ||
4111 | rewinddir (dir); | |
4112 | while ((entry = readdir (dir)) != NULL) | |
4113 | { | |
4114 | struct stat st; | |
4115 | struct statfs stfs; | |
4116 | int fd; | |
4117 | ||
4118 | fd = atoi (entry->d_name); | |
4119 | if (!fd) | |
4120 | continue; | |
4121 | ||
4122 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4123 | if (stat (path, &st) != 0) | |
4124 | continue; | |
4125 | if (!S_ISDIR (st.st_mode)) | |
4126 | continue; | |
4127 | ||
4128 | if (statfs (path, &stfs) != 0) | |
4129 | continue; | |
4130 | if (stfs.f_type != SPUFS_MAGIC) | |
4131 | continue; | |
4132 | ||
4133 | if (pos >= offset && pos + 4 <= offset + len) | |
4134 | { | |
4135 | *(unsigned int *)(buf + pos - offset) = fd; | |
4136 | written += 4; | |
4137 | } | |
4138 | pos += 4; | |
4139 | } | |
4140 | ||
4141 | closedir (dir); | |
4142 | return written; | |
4143 | } | |
4144 | ||
4145 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4146 | object type, using the /proc file system. */ | |
4147 | static int | |
4148 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4149 | unsigned const char *writebuf, | |
4150 | CORE_ADDR offset, int len) | |
4151 | { | |
4152 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4153 | char buf[128]; | |
4154 | int fd = 0; | |
4155 | int ret = 0; | |
4156 | ||
4157 | if (!writebuf && !readbuf) | |
4158 | return -1; | |
4159 | ||
4160 | if (!*annex) | |
4161 | { | |
4162 | if (!readbuf) | |
4163 | return -1; | |
4164 | else | |
4165 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4166 | } | |
4167 | ||
4168 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
4169 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
4170 | if (fd <= 0) | |
4171 | return -1; | |
4172 | ||
4173 | if (offset != 0 | |
4174 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4175 | { | |
4176 | close (fd); | |
4177 | return 0; | |
4178 | } | |
4179 | ||
4180 | if (writebuf) | |
4181 | ret = write (fd, writebuf, (size_t) len); | |
4182 | else | |
4183 | ret = read (fd, readbuf, (size_t) len); | |
4184 | ||
4185 | close (fd); | |
4186 | return ret; | |
4187 | } | |
4188 | ||
dc146f7c VP |
4189 | static int |
4190 | linux_core_of_thread (ptid_t ptid) | |
4191 | { | |
4192 | char filename[sizeof ("/proc//task//stat") | |
4193 | + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */ | |
4194 | + 1]; | |
4195 | FILE *f; | |
4196 | char *content = NULL; | |
4197 | char *p; | |
4198 | char *ts = 0; | |
4199 | int content_read = 0; | |
4200 | int i; | |
4201 | int core; | |
4202 | ||
4203 | sprintf (filename, "/proc/%d/task/%ld/stat", | |
4204 | ptid_get_pid (ptid), ptid_get_lwp (ptid)); | |
4205 | f = fopen (filename, "r"); | |
4206 | if (!f) | |
4207 | return -1; | |
4208 | ||
4209 | for (;;) | |
4210 | { | |
4211 | int n; | |
4212 | content = realloc (content, content_read + 1024); | |
4213 | n = fread (content + content_read, 1, 1024, f); | |
4214 | content_read += n; | |
4215 | if (n < 1024) | |
4216 | { | |
4217 | content[content_read] = '\0'; | |
4218 | break; | |
4219 | } | |
4220 | } | |
4221 | ||
4222 | p = strchr (content, '('); | |
4223 | p = strchr (p, ')') + 2; /* skip ")" and a whitespace. */ | |
4224 | ||
4225 | p = strtok_r (p, " ", &ts); | |
4226 | for (i = 0; i != 36; ++i) | |
4227 | p = strtok_r (NULL, " ", &ts); | |
4228 | ||
4229 | if (sscanf (p, "%d", &core) == 0) | |
4230 | core = -1; | |
4231 | ||
4232 | free (content); | |
4233 | fclose (f); | |
4234 | ||
4235 | return core; | |
4236 | } | |
4237 | ||
1570b33e L |
4238 | static void |
4239 | linux_process_qsupported (const char *query) | |
4240 | { | |
4241 | if (the_low_target.process_qsupported != NULL) | |
4242 | the_low_target.process_qsupported (query); | |
4243 | } | |
4244 | ||
219f2f23 PA |
4245 | static int |
4246 | linux_supports_tracepoints (void) | |
4247 | { | |
4248 | if (*the_low_target.supports_tracepoints == NULL) | |
4249 | return 0; | |
4250 | ||
4251 | return (*the_low_target.supports_tracepoints) (); | |
4252 | } | |
4253 | ||
4254 | static CORE_ADDR | |
4255 | linux_read_pc (struct regcache *regcache) | |
4256 | { | |
4257 | if (the_low_target.get_pc == NULL) | |
4258 | return 0; | |
4259 | ||
4260 | return (*the_low_target.get_pc) (regcache); | |
4261 | } | |
4262 | ||
4263 | static void | |
4264 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
4265 | { | |
4266 | gdb_assert (the_low_target.set_pc != NULL); | |
4267 | ||
4268 | (*the_low_target.set_pc) (regcache, pc); | |
4269 | } | |
4270 | ||
8336d594 PA |
4271 | static int |
4272 | linux_thread_stopped (struct thread_info *thread) | |
4273 | { | |
4274 | return get_thread_lwp (thread)->stopped; | |
4275 | } | |
4276 | ||
4277 | /* This exposes stop-all-threads functionality to other modules. */ | |
4278 | ||
4279 | static void | |
4280 | linux_pause_all (void) | |
4281 | { | |
4282 | stop_all_lwps (); | |
4283 | } | |
4284 | ||
ce3a066d DJ |
4285 | static struct target_ops linux_target_ops = { |
4286 | linux_create_inferior, | |
4287 | linux_attach, | |
4288 | linux_kill, | |
6ad8ae5c | 4289 | linux_detach, |
8336d594 | 4290 | linux_mourn, |
444d6139 | 4291 | linux_join, |
ce3a066d DJ |
4292 | linux_thread_alive, |
4293 | linux_resume, | |
4294 | linux_wait, | |
4295 | linux_fetch_registers, | |
4296 | linux_store_registers, | |
4297 | linux_read_memory, | |
4298 | linux_write_memory, | |
2f2893d9 | 4299 | linux_look_up_symbols, |
ef57601b | 4300 | linux_request_interrupt, |
aa691b87 | 4301 | linux_read_auxv, |
d993e290 PA |
4302 | linux_insert_point, |
4303 | linux_remove_point, | |
e013ee27 OF |
4304 | linux_stopped_by_watchpoint, |
4305 | linux_stopped_data_address, | |
42c81e2a | 4306 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 | 4307 | linux_read_offsets, |
dae5f5cf DJ |
4308 | #else |
4309 | NULL, | |
4310 | #endif | |
4311 | #ifdef USE_THREAD_DB | |
4312 | thread_db_get_tls_address, | |
4313 | #else | |
4314 | NULL, | |
52fb6437 | 4315 | #endif |
efcbbd14 | 4316 | linux_qxfer_spu, |
59a016f0 | 4317 | hostio_last_error_from_errno, |
07e059b5 | 4318 | linux_qxfer_osdata, |
4aa995e1 | 4319 | linux_xfer_siginfo, |
bd99dc85 PA |
4320 | linux_supports_non_stop, |
4321 | linux_async, | |
4322 | linux_start_non_stop, | |
cdbfd419 PP |
4323 | linux_supports_multi_process, |
4324 | #ifdef USE_THREAD_DB | |
dc146f7c | 4325 | thread_db_handle_monitor_command, |
cdbfd419 | 4326 | #else |
dc146f7c | 4327 | NULL, |
cdbfd419 | 4328 | #endif |
1570b33e | 4329 | linux_core_of_thread, |
219f2f23 PA |
4330 | linux_process_qsupported, |
4331 | linux_supports_tracepoints, | |
4332 | linux_read_pc, | |
8336d594 PA |
4333 | linux_write_pc, |
4334 | linux_thread_stopped, | |
4335 | linux_pause_all | |
ce3a066d DJ |
4336 | }; |
4337 | ||
0d62e5e8 DJ |
4338 | static void |
4339 | linux_init_signals () | |
4340 | { | |
4341 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
4342 | to find what the cancel signal actually is. */ | |
60c3d7b0 | 4343 | #ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 4344 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 4345 | #endif |
0d62e5e8 DJ |
4346 | } |
4347 | ||
da6d8c04 DJ |
4348 | void |
4349 | initialize_low (void) | |
4350 | { | |
bd99dc85 PA |
4351 | struct sigaction sigchld_action; |
4352 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 4353 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
4354 | set_breakpoint_data (the_low_target.breakpoint, |
4355 | the_low_target.breakpoint_len); | |
0d62e5e8 | 4356 | linux_init_signals (); |
24a09b5f | 4357 | linux_test_for_tracefork (); |
52fa2412 UW |
4358 | #ifdef HAVE_LINUX_REGSETS |
4359 | for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) | |
4360 | ; | |
bca929d3 | 4361 | disabled_regsets = xmalloc (num_regsets); |
52fa2412 | 4362 | #endif |
bd99dc85 PA |
4363 | |
4364 | sigchld_action.sa_handler = sigchld_handler; | |
4365 | sigemptyset (&sigchld_action.sa_mask); | |
4366 | sigchld_action.sa_flags = SA_RESTART; | |
4367 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
da6d8c04 | 4368 | } |