Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
28e7fd62 | 2 | Copyright (C) 1995-2013 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
d26e3629 | 21 | #include "linux-osdata.h" |
58b4daa5 | 22 | #include "agent.h" |
da6d8c04 | 23 | |
8bdce1ff | 24 | #include "gdb_wait.h" |
da6d8c04 DJ |
25 | #include <stdio.h> |
26 | #include <sys/param.h> | |
da6d8c04 | 27 | #include <sys/ptrace.h> |
af96c192 | 28 | #include "linux-ptrace.h" |
e3deef73 | 29 | #include "linux-procfs.h" |
da6d8c04 DJ |
30 | #include <signal.h> |
31 | #include <sys/ioctl.h> | |
32 | #include <fcntl.h> | |
d07c63e7 | 33 | #include <string.h> |
0a30fbc4 DJ |
34 | #include <stdlib.h> |
35 | #include <unistd.h> | |
fa6a77dc | 36 | #include <errno.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
8bdce1ff | 43 | #include "gdb_stat.h" |
efcbbd14 | 44 | #include <sys/vfs.h> |
1570b33e | 45 | #include <sys/uio.h> |
957f3f49 DE |
46 | #ifndef ELFMAG0 |
47 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
48 | then ELFMAG0 will have been defined. If it didn't get included by | |
49 | gdb_proc_service.h then including it will likely introduce a duplicate | |
50 | definition of elf_fpregset_t. */ | |
51 | #include <elf.h> | |
52 | #endif | |
efcbbd14 UW |
53 | |
54 | #ifndef SPUFS_MAGIC | |
55 | #define SPUFS_MAGIC 0x23c9b64e | |
56 | #endif | |
da6d8c04 | 57 | |
03583c20 UW |
58 | #ifdef HAVE_PERSONALITY |
59 | # include <sys/personality.h> | |
60 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
61 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
62 | # endif | |
63 | #endif | |
64 | ||
fd462a61 DJ |
65 | #ifndef O_LARGEFILE |
66 | #define O_LARGEFILE 0 | |
67 | #endif | |
68 | ||
ec8ebe72 DE |
69 | #ifndef W_STOPCODE |
70 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
71 | #endif | |
72 | ||
1a981360 PA |
73 | /* This is the kernel's hard limit. Not to be confused with |
74 | SIGRTMIN. */ | |
75 | #ifndef __SIGRTMIN | |
76 | #define __SIGRTMIN 32 | |
77 | #endif | |
78 | ||
42c81e2a DJ |
79 | #ifdef __UCLIBC__ |
80 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
23512c01 MGD |
81 | /* PTRACE_TEXT_ADDR and friends. */ |
82 | #include <asm/ptrace.h> | |
42c81e2a DJ |
83 | #define HAS_NOMMU |
84 | #endif | |
85 | #endif | |
86 | ||
db0dfaa0 LM |
87 | /* Some targets did not define these ptrace constants from the start, |
88 | so gdbserver defines them locally here. In the future, these may | |
89 | be removed after they are added to asm/ptrace.h. */ | |
90 | #if !(defined(PT_TEXT_ADDR) \ | |
91 | || defined(PT_DATA_ADDR) \ | |
92 | || defined(PT_TEXT_END_ADDR)) | |
93 | #if defined(__mcoldfire__) | |
94 | /* These are still undefined in 3.10 kernels. */ | |
95 | #define PT_TEXT_ADDR 49*4 | |
96 | #define PT_DATA_ADDR 50*4 | |
97 | #define PT_TEXT_END_ADDR 51*4 | |
98 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
99 | #elif defined(BFIN) | |
100 | #define PT_TEXT_ADDR 220 | |
101 | #define PT_TEXT_END_ADDR 224 | |
102 | #define PT_DATA_ADDR 228 | |
103 | /* These are still undefined in 3.10 kernels. */ | |
104 | #elif defined(__TMS320C6X__) | |
105 | #define PT_TEXT_ADDR (0x10000*4) | |
106 | #define PT_DATA_ADDR (0x10004*4) | |
107 | #define PT_TEXT_END_ADDR (0x10008*4) | |
108 | #endif | |
109 | #endif | |
110 | ||
9accd112 MM |
111 | #ifdef HAVE_LINUX_BTRACE |
112 | # include "linux-btrace.h" | |
113 | #endif | |
114 | ||
8365dcf5 TJB |
115 | #ifndef HAVE_ELF32_AUXV_T |
116 | /* Copied from glibc's elf.h. */ | |
117 | typedef struct | |
118 | { | |
119 | uint32_t a_type; /* Entry type */ | |
120 | union | |
121 | { | |
122 | uint32_t a_val; /* Integer value */ | |
123 | /* We use to have pointer elements added here. We cannot do that, | |
124 | though, since it does not work when using 32-bit definitions | |
125 | on 64-bit platforms and vice versa. */ | |
126 | } a_un; | |
127 | } Elf32_auxv_t; | |
128 | #endif | |
129 | ||
130 | #ifndef HAVE_ELF64_AUXV_T | |
131 | /* Copied from glibc's elf.h. */ | |
132 | typedef struct | |
133 | { | |
134 | uint64_t a_type; /* Entry type */ | |
135 | union | |
136 | { | |
137 | uint64_t a_val; /* Integer value */ | |
138 | /* We use to have pointer elements added here. We cannot do that, | |
139 | though, since it does not work when using 32-bit definitions | |
140 | on 64-bit platforms and vice versa. */ | |
141 | } a_un; | |
142 | } Elf64_auxv_t; | |
143 | #endif | |
144 | ||
24a09b5f DJ |
145 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
146 | representation of the thread ID. | |
611cb4a5 | 147 | |
54a0b537 | 148 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
149 | the same as the LWP ID. |
150 | ||
151 | ``all_processes'' is keyed by the "overall process ID", which | |
152 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 153 | |
54a0b537 | 154 | struct inferior_list all_lwps; |
0d62e5e8 | 155 | |
05044653 PA |
156 | /* A list of all unknown processes which receive stop signals. Some |
157 | other process will presumably claim each of these as forked | |
158 | children momentarily. */ | |
24a09b5f | 159 | |
05044653 PA |
160 | struct simple_pid_list |
161 | { | |
162 | /* The process ID. */ | |
163 | int pid; | |
164 | ||
165 | /* The status as reported by waitpid. */ | |
166 | int status; | |
167 | ||
168 | /* Next in chain. */ | |
169 | struct simple_pid_list *next; | |
170 | }; | |
171 | struct simple_pid_list *stopped_pids; | |
172 | ||
173 | /* Trivial list manipulation functions to keep track of a list of new | |
174 | stopped processes. */ | |
175 | ||
176 | static void | |
177 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
178 | { | |
179 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
180 | ||
181 | new_pid->pid = pid; | |
182 | new_pid->status = status; | |
183 | new_pid->next = *listp; | |
184 | *listp = new_pid; | |
185 | } | |
186 | ||
187 | static int | |
188 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
189 | { | |
190 | struct simple_pid_list **p; | |
191 | ||
192 | for (p = listp; *p != NULL; p = &(*p)->next) | |
193 | if ((*p)->pid == pid) | |
194 | { | |
195 | struct simple_pid_list *next = (*p)->next; | |
196 | ||
197 | *statusp = (*p)->status; | |
198 | xfree (*p); | |
199 | *p = next; | |
200 | return 1; | |
201 | } | |
202 | return 0; | |
203 | } | |
24a09b5f | 204 | |
bde24c0a PA |
205 | enum stopping_threads_kind |
206 | { | |
207 | /* Not stopping threads presently. */ | |
208 | NOT_STOPPING_THREADS, | |
209 | ||
210 | /* Stopping threads. */ | |
211 | STOPPING_THREADS, | |
212 | ||
213 | /* Stopping and suspending threads. */ | |
214 | STOPPING_AND_SUSPENDING_THREADS | |
215 | }; | |
216 | ||
217 | /* This is set while stop_all_lwps is in effect. */ | |
218 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
219 | |
220 | /* FIXME make into a target method? */ | |
24a09b5f | 221 | int using_threads = 1; |
24a09b5f | 222 | |
fa593d66 PA |
223 | /* True if we're presently stabilizing threads (moving them out of |
224 | jump pads). */ | |
225 | static int stabilizing_threads; | |
226 | ||
2acc282a | 227 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 228 | int step, int signal, siginfo_t *info); |
2bd7c093 | 229 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
230 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
231 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 232 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 233 | static void *add_lwp (ptid_t ptid); |
c35fafde | 234 | static int linux_stopped_by_watchpoint (void); |
95954743 | 235 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 236 | static void proceed_all_lwps (void); |
d50171e4 PA |
237 | static int finish_step_over (struct lwp_info *lwp); |
238 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
239 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 240 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
241 | |
242 | /* True if the low target can hardware single-step. Such targets | |
243 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
244 | ||
245 | static int | |
246 | can_hardware_single_step (void) | |
247 | { | |
248 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
249 | } | |
250 | ||
251 | /* True if the low target supports memory breakpoints. If so, we'll | |
252 | have a GET_PC implementation. */ | |
253 | ||
254 | static int | |
255 | supports_breakpoints (void) | |
256 | { | |
257 | return (the_low_target.get_pc != NULL); | |
258 | } | |
0d62e5e8 | 259 | |
fa593d66 PA |
260 | /* Returns true if this target can support fast tracepoints. This |
261 | does not mean that the in-process agent has been loaded in the | |
262 | inferior. */ | |
263 | ||
264 | static int | |
265 | supports_fast_tracepoints (void) | |
266 | { | |
267 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
268 | } | |
269 | ||
c2d6af84 PA |
270 | /* True if LWP is stopped in its stepping range. */ |
271 | ||
272 | static int | |
273 | lwp_in_step_range (struct lwp_info *lwp) | |
274 | { | |
275 | CORE_ADDR pc = lwp->stop_pc; | |
276 | ||
277 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
278 | } | |
279 | ||
0d62e5e8 DJ |
280 | struct pending_signals |
281 | { | |
282 | int signal; | |
32ca6d61 | 283 | siginfo_t info; |
0d62e5e8 DJ |
284 | struct pending_signals *prev; |
285 | }; | |
611cb4a5 | 286 | |
bd99dc85 PA |
287 | /* The read/write ends of the pipe registered as waitable file in the |
288 | event loop. */ | |
289 | static int linux_event_pipe[2] = { -1, -1 }; | |
290 | ||
291 | /* True if we're currently in async mode. */ | |
292 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
293 | ||
02fc4de7 | 294 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
295 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
296 | ||
d0722149 DE |
297 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
298 | ||
299 | static int | |
214d508e | 300 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 301 | { |
214d508e L |
302 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
303 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
304 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
305 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
306 | { | |
307 | *machine = header->e_machine; | |
308 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
309 | ||
310 | } | |
311 | *machine = EM_NONE; | |
312 | return -1; | |
d0722149 DE |
313 | } |
314 | ||
315 | /* Return non-zero if FILE is a 64-bit ELF file, | |
316 | zero if the file is not a 64-bit ELF file, | |
317 | and -1 if the file is not accessible or doesn't exist. */ | |
318 | ||
be07f1a2 | 319 | static int |
214d508e | 320 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 321 | { |
957f3f49 | 322 | Elf64_Ehdr header; |
d0722149 DE |
323 | int fd; |
324 | ||
325 | fd = open (file, O_RDONLY); | |
326 | if (fd < 0) | |
327 | return -1; | |
328 | ||
329 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
330 | { | |
331 | close (fd); | |
332 | return 0; | |
333 | } | |
334 | close (fd); | |
335 | ||
214d508e | 336 | return elf_64_header_p (&header, machine); |
d0722149 DE |
337 | } |
338 | ||
be07f1a2 PA |
339 | /* Accepts an integer PID; Returns true if the executable PID is |
340 | running is a 64-bit ELF file.. */ | |
341 | ||
342 | int | |
214d508e | 343 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 PA |
344 | { |
345 | char file[MAXPATHLEN]; | |
346 | ||
347 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 348 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
349 | } |
350 | ||
bd99dc85 PA |
351 | static void |
352 | delete_lwp (struct lwp_info *lwp) | |
353 | { | |
354 | remove_thread (get_lwp_thread (lwp)); | |
355 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 356 | free (lwp->arch_private); |
bd99dc85 PA |
357 | free (lwp); |
358 | } | |
359 | ||
95954743 PA |
360 | /* Add a process to the common process list, and set its private |
361 | data. */ | |
362 | ||
363 | static struct process_info * | |
364 | linux_add_process (int pid, int attached) | |
365 | { | |
366 | struct process_info *proc; | |
367 | ||
95954743 PA |
368 | proc = add_process (pid, attached); |
369 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
370 | ||
3aee8918 PA |
371 | /* Set the arch when the first LWP stops. */ |
372 | proc->private->new_inferior = 1; | |
373 | ||
aa5ca48f DE |
374 | if (the_low_target.new_process != NULL) |
375 | proc->private->arch_private = the_low_target.new_process (); | |
376 | ||
95954743 PA |
377 | return proc; |
378 | } | |
379 | ||
07d4f67e DE |
380 | /* Wrapper function for waitpid which handles EINTR, and emulates |
381 | __WALL for systems where that is not available. */ | |
382 | ||
383 | static int | |
384 | my_waitpid (int pid, int *status, int flags) | |
385 | { | |
386 | int ret, out_errno; | |
387 | ||
388 | if (debug_threads) | |
389 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
390 | ||
391 | if (flags & __WALL) | |
392 | { | |
393 | sigset_t block_mask, org_mask, wake_mask; | |
394 | int wnohang; | |
395 | ||
396 | wnohang = (flags & WNOHANG) != 0; | |
397 | flags &= ~(__WALL | __WCLONE); | |
398 | flags |= WNOHANG; | |
399 | ||
400 | /* Block all signals while here. This avoids knowing about | |
401 | LinuxThread's signals. */ | |
402 | sigfillset (&block_mask); | |
403 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
404 | ||
405 | /* ... except during the sigsuspend below. */ | |
406 | sigemptyset (&wake_mask); | |
407 | ||
408 | while (1) | |
409 | { | |
410 | /* Since all signals are blocked, there's no need to check | |
411 | for EINTR here. */ | |
412 | ret = waitpid (pid, status, flags); | |
413 | out_errno = errno; | |
414 | ||
415 | if (ret == -1 && out_errno != ECHILD) | |
416 | break; | |
417 | else if (ret > 0) | |
418 | break; | |
419 | ||
420 | if (flags & __WCLONE) | |
421 | { | |
422 | /* We've tried both flavors now. If WNOHANG is set, | |
423 | there's nothing else to do, just bail out. */ | |
424 | if (wnohang) | |
425 | break; | |
426 | ||
427 | if (debug_threads) | |
428 | fprintf (stderr, "blocking\n"); | |
429 | ||
430 | /* Block waiting for signals. */ | |
431 | sigsuspend (&wake_mask); | |
432 | } | |
433 | ||
434 | flags ^= __WCLONE; | |
435 | } | |
436 | ||
437 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
438 | } | |
439 | else | |
440 | { | |
441 | do | |
442 | ret = waitpid (pid, status, flags); | |
443 | while (ret == -1 && errno == EINTR); | |
444 | out_errno = errno; | |
445 | } | |
446 | ||
447 | if (debug_threads) | |
448 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
449 | pid, flags, status ? *status : -1, ret); | |
450 | ||
451 | errno = out_errno; | |
452 | return ret; | |
453 | } | |
454 | ||
bd99dc85 PA |
455 | /* Handle a GNU/Linux extended wait response. If we see a clone |
456 | event, we need to add the new LWP to our list (and not report the | |
457 | trap to higher layers). */ | |
0d62e5e8 | 458 | |
24a09b5f | 459 | static void |
54a0b537 | 460 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
461 | { |
462 | int event = wstat >> 16; | |
54a0b537 | 463 | struct lwp_info *new_lwp; |
24a09b5f DJ |
464 | |
465 | if (event == PTRACE_EVENT_CLONE) | |
466 | { | |
95954743 | 467 | ptid_t ptid; |
24a09b5f | 468 | unsigned long new_pid; |
05044653 | 469 | int ret, status; |
24a09b5f | 470 | |
56f7af9c MS |
471 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), (PTRACE_ARG3_TYPE) 0, |
472 | &new_pid); | |
24a09b5f DJ |
473 | |
474 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 475 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
476 | { |
477 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
478 | hits the SIGSTOP, but we're already attached. */ | |
479 | ||
97438e3f | 480 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
481 | |
482 | if (ret == -1) | |
483 | perror_with_name ("waiting for new child"); | |
484 | else if (ret != new_pid) | |
485 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 486 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
487 | warning ("wait returned unexpected status 0x%x", status); |
488 | } | |
489 | ||
95954743 PA |
490 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
491 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
492 | add_thread (ptid, new_lwp); | |
24a09b5f | 493 | |
e27d73f6 DE |
494 | /* Either we're going to immediately resume the new thread |
495 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
496 | thinks the thread is currently running, so set this first | |
497 | before calling linux_resume_one_lwp. */ | |
498 | new_lwp->stopped = 1; | |
499 | ||
bde24c0a PA |
500 | /* If we're suspending all threads, leave this one suspended |
501 | too. */ | |
502 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
503 | new_lwp->suspended = 1; | |
504 | ||
da5898ce DJ |
505 | /* Normally we will get the pending SIGSTOP. But in some cases |
506 | we might get another signal delivered to the group first. | |
f21cc1a2 | 507 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
508 | if (WSTOPSIG (status) == SIGSTOP) |
509 | { | |
bde24c0a | 510 | if (stopping_threads != NOT_STOPPING_THREADS) |
d50171e4 PA |
511 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
512 | else | |
e27d73f6 | 513 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 514 | } |
24a09b5f | 515 | else |
da5898ce | 516 | { |
54a0b537 | 517 | new_lwp->stop_expected = 1; |
d50171e4 | 518 | |
bde24c0a | 519 | if (stopping_threads != NOT_STOPPING_THREADS) |
da5898ce | 520 | { |
d50171e4 | 521 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
522 | new_lwp->status_pending_p = 1; |
523 | new_lwp->status_pending = status; | |
da5898ce DJ |
524 | } |
525 | else | |
526 | /* Pass the signal on. This is what GDB does - except | |
527 | shouldn't we really report it instead? */ | |
e27d73f6 | 528 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 529 | } |
24a09b5f DJ |
530 | |
531 | /* Always resume the current thread. If we are stopping | |
532 | threads, it will have a pending SIGSTOP; we may as well | |
533 | collect it now. */ | |
2acc282a | 534 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
535 | } |
536 | } | |
537 | ||
d50171e4 PA |
538 | /* Return the PC as read from the regcache of LWP, without any |
539 | adjustment. */ | |
540 | ||
541 | static CORE_ADDR | |
542 | get_pc (struct lwp_info *lwp) | |
543 | { | |
544 | struct thread_info *saved_inferior; | |
545 | struct regcache *regcache; | |
546 | CORE_ADDR pc; | |
547 | ||
548 | if (the_low_target.get_pc == NULL) | |
549 | return 0; | |
550 | ||
551 | saved_inferior = current_inferior; | |
552 | current_inferior = get_lwp_thread (lwp); | |
553 | ||
554 | regcache = get_thread_regcache (current_inferior, 1); | |
555 | pc = (*the_low_target.get_pc) (regcache); | |
556 | ||
557 | if (debug_threads) | |
558 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
559 | ||
560 | current_inferior = saved_inferior; | |
561 | return pc; | |
562 | } | |
563 | ||
564 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
565 | The SIGTRAP could mean several things. |
566 | ||
567 | On i386, where decr_pc_after_break is non-zero: | |
568 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
569 | we will get only the one SIGTRAP (even if the instruction we | |
570 | stepped over was a breakpoint). The value of $eip will be the | |
571 | next instruction. | |
572 | If we continue the process using PTRACE_CONT, we will get a | |
573 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
574 | the instruction after the breakpoint (i.e. needs to be | |
575 | decremented). If we report the SIGTRAP to GDB, we must also | |
576 | report the undecremented PC. If we cancel the SIGTRAP, we | |
577 | must resume at the decremented PC. | |
578 | ||
579 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
580 | with hardware or kernel single-step: | |
581 | If we single-step over a breakpoint instruction, our PC will | |
582 | point at the following instruction. If we continue and hit a | |
583 | breakpoint instruction, our PC will point at the breakpoint | |
584 | instruction. */ | |
585 | ||
586 | static CORE_ADDR | |
d50171e4 | 587 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 588 | { |
d50171e4 PA |
589 | CORE_ADDR stop_pc; |
590 | ||
591 | if (the_low_target.get_pc == NULL) | |
592 | return 0; | |
0d62e5e8 | 593 | |
d50171e4 PA |
594 | stop_pc = get_pc (lwp); |
595 | ||
bdabb078 PA |
596 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
597 | && !lwp->stepping | |
598 | && !lwp->stopped_by_watchpoint | |
599 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
600 | stop_pc -= the_low_target.decr_pc_after_break; |
601 | ||
602 | if (debug_threads) | |
603 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
604 | ||
605 | return stop_pc; | |
0d62e5e8 | 606 | } |
ce3a066d | 607 | |
0d62e5e8 | 608 | static void * |
95954743 | 609 | add_lwp (ptid_t ptid) |
611cb4a5 | 610 | { |
54a0b537 | 611 | struct lwp_info *lwp; |
0d62e5e8 | 612 | |
54a0b537 PA |
613 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
614 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 615 | |
95954743 | 616 | lwp->head.id = ptid; |
0d62e5e8 | 617 | |
aa5ca48f DE |
618 | if (the_low_target.new_thread != NULL) |
619 | lwp->arch_private = the_low_target.new_thread (); | |
620 | ||
54a0b537 | 621 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 622 | |
54a0b537 | 623 | return lwp; |
0d62e5e8 | 624 | } |
611cb4a5 | 625 | |
da6d8c04 DJ |
626 | /* Start an inferior process and returns its pid. |
627 | ALLARGS is a vector of program-name and args. */ | |
628 | ||
ce3a066d DJ |
629 | static int |
630 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 631 | { |
03583c20 UW |
632 | #ifdef HAVE_PERSONALITY |
633 | int personality_orig = 0, personality_set = 0; | |
634 | #endif | |
a6dbe5df | 635 | struct lwp_info *new_lwp; |
da6d8c04 | 636 | int pid; |
95954743 | 637 | ptid_t ptid; |
da6d8c04 | 638 | |
03583c20 UW |
639 | #ifdef HAVE_PERSONALITY |
640 | if (disable_randomization) | |
641 | { | |
642 | errno = 0; | |
643 | personality_orig = personality (0xffffffff); | |
644 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
645 | { | |
646 | personality_set = 1; | |
647 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
648 | } | |
649 | if (errno != 0 || (personality_set | |
650 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
651 | warning ("Error disabling address space randomization: %s", | |
652 | strerror (errno)); | |
653 | } | |
654 | #endif | |
655 | ||
42c81e2a | 656 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
657 | pid = vfork (); |
658 | #else | |
da6d8c04 | 659 | pid = fork (); |
52fb6437 | 660 | #endif |
da6d8c04 DJ |
661 | if (pid < 0) |
662 | perror_with_name ("fork"); | |
663 | ||
664 | if (pid == 0) | |
665 | { | |
56f7af9c | 666 | ptrace (PTRACE_TRACEME, 0, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
da6d8c04 | 667 | |
1a981360 | 668 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 669 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 670 | #endif |
0d62e5e8 | 671 | |
a9fa9f7d DJ |
672 | setpgid (0, 0); |
673 | ||
e0f9f062 DE |
674 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
675 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
676 | Also, redirect stdin to /dev/null. */ | |
677 | if (remote_connection_is_stdio ()) | |
678 | { | |
679 | close (0); | |
680 | open ("/dev/null", O_RDONLY); | |
681 | dup2 (2, 1); | |
3e52c33d JK |
682 | if (write (2, "stdin/stdout redirected\n", |
683 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
684 | { |
685 | /* Errors ignored. */; | |
686 | } | |
e0f9f062 DE |
687 | } |
688 | ||
2b876972 DJ |
689 | execv (program, allargs); |
690 | if (errno == ENOENT) | |
691 | execvp (program, allargs); | |
da6d8c04 DJ |
692 | |
693 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 694 | strerror (errno)); |
da6d8c04 DJ |
695 | fflush (stderr); |
696 | _exit (0177); | |
697 | } | |
698 | ||
03583c20 UW |
699 | #ifdef HAVE_PERSONALITY |
700 | if (personality_set) | |
701 | { | |
702 | errno = 0; | |
703 | personality (personality_orig); | |
704 | if (errno != 0) | |
705 | warning ("Error restoring address space randomization: %s", | |
706 | strerror (errno)); | |
707 | } | |
708 | #endif | |
709 | ||
95954743 PA |
710 | linux_add_process (pid, 0); |
711 | ||
712 | ptid = ptid_build (pid, pid, 0); | |
713 | new_lwp = add_lwp (ptid); | |
714 | add_thread (ptid, new_lwp); | |
a6dbe5df | 715 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 716 | |
a9fa9f7d | 717 | return pid; |
da6d8c04 DJ |
718 | } |
719 | ||
720 | /* Attach to an inferior process. */ | |
721 | ||
95954743 PA |
722 | static void |
723 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 724 | { |
95954743 | 725 | ptid_t ptid; |
54a0b537 | 726 | struct lwp_info *new_lwp; |
611cb4a5 | 727 | |
56f7af9c MS |
728 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0) |
729 | != 0) | |
da6d8c04 | 730 | { |
87b0bb13 JK |
731 | struct buffer buffer; |
732 | ||
95954743 | 733 | if (!initial) |
2d717e4f DJ |
734 | { |
735 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 736 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
737 | strerror (errno), errno); |
738 | fflush (stderr); | |
739 | return; | |
740 | } | |
5f572dec JK |
741 | |
742 | /* If we fail to attach to a process, report an error. */ | |
87b0bb13 JK |
743 | buffer_init (&buffer); |
744 | linux_ptrace_attach_warnings (lwpid, &buffer); | |
745 | buffer_grow_str0 (&buffer, ""); | |
746 | error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer), | |
747 | lwpid, strerror (errno), errno); | |
da6d8c04 DJ |
748 | } |
749 | ||
95954743 | 750 | if (initial) |
e3deef73 LM |
751 | /* If lwp is the tgid, we handle adding existing threads later. |
752 | Otherwise we just add lwp without bothering about any other | |
753 | threads. */ | |
95954743 PA |
754 | ptid = ptid_build (lwpid, lwpid, 0); |
755 | else | |
756 | { | |
757 | /* Note that extracting the pid from the current inferior is | |
758 | safe, since we're always called in the context of the same | |
759 | process as this new thread. */ | |
760 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
761 | ptid = ptid_build (pid, lwpid, 0); | |
762 | } | |
24a09b5f | 763 | |
95954743 PA |
764 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
765 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 766 | |
a6dbe5df PA |
767 | /* We need to wait for SIGSTOP before being able to make the next |
768 | ptrace call on this LWP. */ | |
769 | new_lwp->must_set_ptrace_flags = 1; | |
770 | ||
644cebc9 | 771 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
772 | { |
773 | if (debug_threads) | |
774 | fprintf (stderr, | |
775 | "Attached to a stopped process\n"); | |
776 | ||
777 | /* The process is definitely stopped. It is in a job control | |
778 | stop, unless the kernel predates the TASK_STOPPED / | |
779 | TASK_TRACED distinction, in which case it might be in a | |
780 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
781 | can kill it, signal it, et cetera. | |
782 | ||
783 | First make sure there is a pending SIGSTOP. Since we are | |
784 | already attached, the process can not transition from stopped | |
785 | to running without a PTRACE_CONT; so we know this signal will | |
786 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
787 | probably already in the queue (unless this kernel is old | |
788 | enough to use TASK_STOPPED for ptrace stops); but since | |
789 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
790 | kill_lwp (lwpid, SIGSTOP); | |
791 | ||
792 | /* Finally, resume the stopped process. This will deliver the | |
793 | SIGSTOP (or a higher priority signal, just like normal | |
794 | PTRACE_ATTACH), which we'll catch later on. */ | |
56f7af9c | 795 | ptrace (PTRACE_CONT, lwpid, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
c14d7ab2 PA |
796 | } |
797 | ||
0d62e5e8 | 798 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
799 | brings it to a halt. |
800 | ||
801 | There are several cases to consider here: | |
802 | ||
803 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 804 | of a new thread that is being created. |
d50171e4 PA |
805 | In this case we should ignore that SIGSTOP and resume the |
806 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 807 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 808 | resume_continue. |
0e21c1ec DE |
809 | |
810 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
811 | to it via attach_inferior. |
812 | In this case we want the process thread to stop. | |
d50171e4 PA |
813 | This is handled by having linux_attach set last_resume_kind == |
814 | resume_stop after we return. | |
e3deef73 LM |
815 | |
816 | If the pid we are attaching to is also the tgid, we attach to and | |
817 | stop all the existing threads. Otherwise, we attach to pid and | |
818 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
819 | |
820 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
821 | existing threads. |
822 | In this case we want the thread to stop. | |
823 | FIXME: This case is currently not properly handled. | |
824 | We should wait for the SIGSTOP but don't. Things work apparently | |
825 | because enough time passes between when we ptrace (ATTACH) and when | |
826 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
827 | |
828 | On the other hand, if we are currently trying to stop all threads, we | |
829 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 830 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
831 | end of the list, and so the new thread has not yet reached |
832 | wait_for_sigstop (but will). */ | |
d50171e4 | 833 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
834 | } |
835 | ||
95954743 PA |
836 | void |
837 | linux_attach_lwp (unsigned long lwpid) | |
838 | { | |
839 | linux_attach_lwp_1 (lwpid, 0); | |
840 | } | |
841 | ||
e3deef73 LM |
842 | /* Attach to PID. If PID is the tgid, attach to it and all |
843 | of its threads. */ | |
844 | ||
c52daf70 | 845 | static int |
a1928bad | 846 | linux_attach (unsigned long pid) |
0d62e5e8 | 847 | { |
e3deef73 LM |
848 | /* Attach to PID. We will check for other threads |
849 | soon. */ | |
95954743 | 850 | linux_attach_lwp_1 (pid, 1); |
95954743 | 851 | linux_add_process (pid, 1); |
0d62e5e8 | 852 | |
bd99dc85 PA |
853 | if (!non_stop) |
854 | { | |
8336d594 PA |
855 | struct thread_info *thread; |
856 | ||
857 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
858 | process. It will be collected by wait shortly. */ | |
859 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
860 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 861 | } |
0d62e5e8 | 862 | |
e3deef73 LM |
863 | if (linux_proc_get_tgid (pid) == pid) |
864 | { | |
865 | DIR *dir; | |
866 | char pathname[128]; | |
867 | ||
868 | sprintf (pathname, "/proc/%ld/task", pid); | |
869 | ||
870 | dir = opendir (pathname); | |
871 | ||
872 | if (!dir) | |
873 | { | |
874 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
875 | fflush (stderr); | |
876 | } | |
877 | else | |
878 | { | |
879 | /* At this point we attached to the tgid. Scan the task for | |
880 | existing threads. */ | |
881 | unsigned long lwp; | |
882 | int new_threads_found; | |
883 | int iterations = 0; | |
884 | struct dirent *dp; | |
885 | ||
886 | while (iterations < 2) | |
887 | { | |
888 | new_threads_found = 0; | |
889 | /* Add all the other threads. While we go through the | |
890 | threads, new threads may be spawned. Cycle through | |
891 | the list of threads until we have done two iterations without | |
892 | finding new threads. */ | |
893 | while ((dp = readdir (dir)) != NULL) | |
894 | { | |
895 | /* Fetch one lwp. */ | |
896 | lwp = strtoul (dp->d_name, NULL, 10); | |
897 | ||
898 | /* Is this a new thread? */ | |
899 | if (lwp | |
900 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
901 | { | |
902 | linux_attach_lwp_1 (lwp, 0); | |
903 | new_threads_found++; | |
904 | ||
905 | if (debug_threads) | |
906 | fprintf (stderr, "\ | |
907 | Found and attached to new lwp %ld\n", lwp); | |
908 | } | |
909 | } | |
910 | ||
911 | if (!new_threads_found) | |
912 | iterations++; | |
913 | else | |
914 | iterations = 0; | |
915 | ||
916 | rewinddir (dir); | |
917 | } | |
918 | closedir (dir); | |
919 | } | |
920 | } | |
921 | ||
95954743 PA |
922 | return 0; |
923 | } | |
924 | ||
925 | struct counter | |
926 | { | |
927 | int pid; | |
928 | int count; | |
929 | }; | |
930 | ||
931 | static int | |
932 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
933 | { | |
934 | struct counter *counter = args; | |
935 | ||
936 | if (ptid_get_pid (entry->id) == counter->pid) | |
937 | { | |
938 | if (++counter->count > 1) | |
939 | return 1; | |
940 | } | |
d61ddec4 | 941 | |
da6d8c04 DJ |
942 | return 0; |
943 | } | |
944 | ||
95954743 PA |
945 | static int |
946 | last_thread_of_process_p (struct thread_info *thread) | |
947 | { | |
948 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
949 | int pid = ptid_get_pid (ptid); | |
950 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 951 | |
95954743 PA |
952 | return (find_inferior (&all_threads, |
953 | second_thread_of_pid_p, &counter) == NULL); | |
954 | } | |
955 | ||
da84f473 PA |
956 | /* Kill LWP. */ |
957 | ||
958 | static void | |
959 | linux_kill_one_lwp (struct lwp_info *lwp) | |
960 | { | |
961 | int pid = lwpid_of (lwp); | |
962 | ||
963 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
964 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
965 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
966 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
967 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
968 | per process, not one for each thread. But since we still support | |
969 | linuxthreads, and we also support debugging programs using raw | |
970 | clone without CLONE_THREAD, we send one for each thread. For | |
971 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
972 | about some old kernels where PTRACE_KILL might work better | |
973 | (dubious if there are any such, but that's why it's paranoia), so | |
974 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
975 | everywhere. */ | |
976 | ||
977 | errno = 0; | |
978 | kill (pid, SIGKILL); | |
979 | if (debug_threads) | |
980 | fprintf (stderr, | |
981 | "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
982 | target_pid_to_str (ptid_of (lwp)), | |
983 | errno ? strerror (errno) : "OK"); | |
984 | ||
985 | errno = 0; | |
56f7af9c | 986 | ptrace (PTRACE_KILL, pid, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
da84f473 PA |
987 | if (debug_threads) |
988 | fprintf (stderr, | |
989 | "LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
990 | target_pid_to_str (ptid_of (lwp)), | |
991 | errno ? strerror (errno) : "OK"); | |
992 | } | |
993 | ||
994 | /* Callback for `find_inferior'. Kills an lwp of a given process, | |
995 | except the leader. */ | |
95954743 PA |
996 | |
997 | static int | |
da84f473 | 998 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 999 | { |
0d62e5e8 | 1000 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1001 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1002 | int wstat; |
95954743 PA |
1003 | int pid = * (int *) args; |
1004 | ||
1005 | if (ptid_get_pid (entry->id) != pid) | |
1006 | return 0; | |
0d62e5e8 | 1007 | |
fd500816 DJ |
1008 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1009 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1010 | the children get a chance to be reaped, it will remain a zombie | |
1011 | forever. */ | |
95954743 | 1012 | |
12b42a12 | 1013 | if (lwpid_of (lwp) == pid) |
95954743 PA |
1014 | { |
1015 | if (debug_threads) | |
1016 | fprintf (stderr, "lkop: is last of process %s\n", | |
1017 | target_pid_to_str (entry->id)); | |
1018 | return 0; | |
1019 | } | |
fd500816 | 1020 | |
0d62e5e8 DJ |
1021 | do |
1022 | { | |
da84f473 | 1023 | linux_kill_one_lwp (lwp); |
0d62e5e8 DJ |
1024 | |
1025 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 1026 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 1027 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
1028 | |
1029 | return 0; | |
da6d8c04 DJ |
1030 | } |
1031 | ||
95954743 PA |
1032 | static int |
1033 | linux_kill (int pid) | |
0d62e5e8 | 1034 | { |
95954743 | 1035 | struct process_info *process; |
54a0b537 | 1036 | struct lwp_info *lwp; |
fd500816 | 1037 | int wstat; |
95954743 | 1038 | int lwpid; |
fd500816 | 1039 | |
95954743 PA |
1040 | process = find_process_pid (pid); |
1041 | if (process == NULL) | |
1042 | return -1; | |
9d606399 | 1043 | |
f9e39928 PA |
1044 | /* If we're killing a running inferior, make sure it is stopped |
1045 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1046 | stop_all_lwps (0, NULL); |
f9e39928 | 1047 | |
da84f473 | 1048 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1049 | |
54a0b537 | 1050 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1051 | thread in the list, so do so now. */ |
95954743 | 1052 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1053 | |
784867a5 | 1054 | if (lwp == NULL) |
fd500816 | 1055 | { |
784867a5 JK |
1056 | if (debug_threads) |
1057 | fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n", | |
1058 | lwpid_of (lwp), pid); | |
1059 | } | |
1060 | else | |
1061 | { | |
1062 | if (debug_threads) | |
1063 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", | |
1064 | lwpid_of (lwp), pid); | |
fd500816 | 1065 | |
784867a5 JK |
1066 | do |
1067 | { | |
da84f473 | 1068 | linux_kill_one_lwp (lwp); |
784867a5 JK |
1069 | |
1070 | /* Make sure it died. The loop is most likely unnecessary. */ | |
1071 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); | |
1072 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
1073 | } | |
2d717e4f | 1074 | |
8336d594 | 1075 | the_target->mourn (process); |
f9e39928 PA |
1076 | |
1077 | /* Since we presently can only stop all lwps of all processes, we | |
1078 | need to unstop lwps of other processes. */ | |
7984d532 | 1079 | unstop_all_lwps (0, NULL); |
95954743 | 1080 | return 0; |
0d62e5e8 DJ |
1081 | } |
1082 | ||
9b224c5e PA |
1083 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1084 | signal the thread last stopped for, which we need to deliver to the | |
1085 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1086 | ||
1087 | static int | |
1088 | get_detach_signal (struct thread_info *thread) | |
1089 | { | |
a493e3e2 | 1090 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1091 | int status; |
1092 | struct lwp_info *lp = get_thread_lwp (thread); | |
1093 | ||
1094 | if (lp->status_pending_p) | |
1095 | status = lp->status_pending; | |
1096 | else | |
1097 | { | |
1098 | /* If the thread had been suspended by gdbserver, and it stopped | |
1099 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1100 | want to deliver that SIGSTOP. */ | |
1101 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1102 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1103 | return 0; |
1104 | ||
1105 | /* Otherwise, we may need to deliver the signal we | |
1106 | intercepted. */ | |
1107 | status = lp->last_status; | |
1108 | } | |
1109 | ||
1110 | if (!WIFSTOPPED (status)) | |
1111 | { | |
1112 | if (debug_threads) | |
1113 | fprintf (stderr, | |
1114 | "GPS: lwp %s hasn't stopped: no pending signal\n", | |
1115 | target_pid_to_str (ptid_of (lp))); | |
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
1120 | if (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1121 | { | |
1122 | if (debug_threads) | |
1123 | fprintf (stderr, | |
1124 | "GPS: lwp %s had stopped with extended " | |
1125 | "status: no pending signal\n", | |
1126 | target_pid_to_str (ptid_of (lp))); | |
1127 | return 0; | |
1128 | } | |
1129 | ||
2ea28649 | 1130 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1131 | |
1132 | if (program_signals_p && !program_signals[signo]) | |
1133 | { | |
1134 | if (debug_threads) | |
1135 | fprintf (stderr, | |
1136 | "GPS: lwp %s had signal %s, but it is in nopass state\n", | |
1137 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1138 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1139 | return 0; |
1140 | } | |
1141 | else if (!program_signals_p | |
1142 | /* If we have no way to know which signals GDB does not | |
1143 | want to have passed to the program, assume | |
1144 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1145 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1146 | { |
1147 | if (debug_threads) | |
1148 | fprintf (stderr, | |
1149 | "GPS: lwp %s had signal %s, " | |
1150 | "but we don't know if we should pass it. Default to not.\n", | |
1151 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1152 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1153 | return 0; |
1154 | } | |
1155 | else | |
1156 | { | |
1157 | if (debug_threads) | |
1158 | fprintf (stderr, | |
1159 | "GPS: lwp %s has pending signal %s: delivering it.\n", | |
1160 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1161 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1162 | |
1163 | return WSTOPSIG (status); | |
1164 | } | |
1165 | } | |
1166 | ||
95954743 PA |
1167 | static int |
1168 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1169 | { |
1170 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1171 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1172 | int pid = * (int *) args; |
9b224c5e | 1173 | int sig; |
95954743 PA |
1174 | |
1175 | if (ptid_get_pid (entry->id) != pid) | |
1176 | return 0; | |
6ad8ae5c | 1177 | |
9b224c5e | 1178 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1179 | if (lwp->stop_expected) |
ae13219e | 1180 | { |
9b224c5e PA |
1181 | if (debug_threads) |
1182 | fprintf (stderr, | |
1183 | "Sending SIGCONT to %s\n", | |
1184 | target_pid_to_str (ptid_of (lwp))); | |
1185 | ||
1186 | kill_lwp (lwpid_of (lwp), SIGCONT); | |
54a0b537 | 1187 | lwp->stop_expected = 0; |
ae13219e DJ |
1188 | } |
1189 | ||
1190 | /* Flush any pending changes to the process's registers. */ | |
3aee8918 | 1191 | regcache_invalidate_thread (get_lwp_thread (lwp)); |
ae13219e | 1192 | |
9b224c5e PA |
1193 | /* Pass on any pending signal for this thread. */ |
1194 | sig = get_detach_signal (thread); | |
1195 | ||
ae13219e | 1196 | /* Finally, let it resume. */ |
82bfbe7e PA |
1197 | if (the_low_target.prepare_to_resume != NULL) |
1198 | the_low_target.prepare_to_resume (lwp); | |
56f7af9c | 1199 | if (ptrace (PTRACE_DETACH, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
f15f9948 | 1200 | (PTRACE_ARG4_TYPE) (long) sig) < 0) |
9b224c5e PA |
1201 | error (_("Can't detach %s: %s"), |
1202 | target_pid_to_str (ptid_of (lwp)), | |
1203 | strerror (errno)); | |
bd99dc85 PA |
1204 | |
1205 | delete_lwp (lwp); | |
95954743 | 1206 | return 0; |
6ad8ae5c DJ |
1207 | } |
1208 | ||
95954743 PA |
1209 | static int |
1210 | linux_detach (int pid) | |
1211 | { | |
1212 | struct process_info *process; | |
1213 | ||
1214 | process = find_process_pid (pid); | |
1215 | if (process == NULL) | |
1216 | return -1; | |
1217 | ||
f9e39928 PA |
1218 | /* Stop all threads before detaching. First, ptrace requires that |
1219 | the thread is stopped to sucessfully detach. Second, thread_db | |
1220 | may need to uninstall thread event breakpoints from memory, which | |
1221 | only works with a stopped process anyway. */ | |
7984d532 | 1222 | stop_all_lwps (0, NULL); |
f9e39928 | 1223 | |
ca5c370d | 1224 | #ifdef USE_THREAD_DB |
8336d594 | 1225 | thread_db_detach (process); |
ca5c370d PA |
1226 | #endif |
1227 | ||
fa593d66 PA |
1228 | /* Stabilize threads (move out of jump pads). */ |
1229 | stabilize_threads (); | |
1230 | ||
95954743 | 1231 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1232 | |
1233 | the_target->mourn (process); | |
f9e39928 PA |
1234 | |
1235 | /* Since we presently can only stop all lwps of all processes, we | |
1236 | need to unstop lwps of other processes. */ | |
7984d532 | 1237 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1238 | return 0; |
1239 | } | |
1240 | ||
1241 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1242 | ||
1243 | static int | |
1244 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1245 | { | |
1246 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1247 | struct process_info *process = proc; | |
1248 | ||
1249 | if (pid_of (lwp) == pid_of (process)) | |
1250 | delete_lwp (lwp); | |
1251 | ||
dd6953e1 | 1252 | return 0; |
6ad8ae5c DJ |
1253 | } |
1254 | ||
8336d594 PA |
1255 | static void |
1256 | linux_mourn (struct process_info *process) | |
1257 | { | |
1258 | struct process_info_private *priv; | |
1259 | ||
1260 | #ifdef USE_THREAD_DB | |
1261 | thread_db_mourn (process); | |
1262 | #endif | |
1263 | ||
f9e39928 PA |
1264 | find_inferior (&all_lwps, delete_lwp_callback, process); |
1265 | ||
8336d594 PA |
1266 | /* Freeing all private data. */ |
1267 | priv = process->private; | |
1268 | free (priv->arch_private); | |
1269 | free (priv); | |
1270 | process->private = NULL; | |
505106cd PA |
1271 | |
1272 | remove_process (process); | |
8336d594 PA |
1273 | } |
1274 | ||
444d6139 | 1275 | static void |
95954743 | 1276 | linux_join (int pid) |
444d6139 | 1277 | { |
444d6139 PA |
1278 | int status, ret; |
1279 | ||
1280 | do { | |
95954743 | 1281 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1282 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1283 | break; | |
1284 | } while (ret != -1 || errno != ECHILD); | |
1285 | } | |
1286 | ||
6ad8ae5c | 1287 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1288 | static int |
95954743 | 1289 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1290 | { |
95954743 PA |
1291 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1292 | ||
1293 | /* We assume we always know if a thread exits. If a whole process | |
1294 | exited but we still haven't been able to report it to GDB, we'll | |
1295 | hold on to the last lwp of the dead process. */ | |
1296 | if (lwp != NULL) | |
1297 | return !lwp->dead; | |
0d62e5e8 DJ |
1298 | else |
1299 | return 0; | |
1300 | } | |
1301 | ||
6bf5e0ba | 1302 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1303 | static int |
d50171e4 | 1304 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1305 | { |
54a0b537 | 1306 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1307 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1308 | struct thread_info *thread; |
95954743 PA |
1309 | |
1310 | /* Check if we're only interested in events from a specific process | |
1311 | or its lwps. */ | |
1312 | if (!ptid_equal (minus_one_ptid, ptid) | |
1313 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
1314 | return 0; | |
0d62e5e8 | 1315 | |
d50171e4 PA |
1316 | thread = get_lwp_thread (lwp); |
1317 | ||
1318 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1319 | report any status pending the LWP may have. */ | |
8336d594 | 1320 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1321 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1322 | return 0; |
0d62e5e8 | 1323 | |
d50171e4 | 1324 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1325 | } |
1326 | ||
95954743 PA |
1327 | static int |
1328 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1329 | { | |
1330 | ptid_t ptid = *(ptid_t *) data; | |
1331 | int lwp; | |
1332 | ||
1333 | if (ptid_get_lwp (ptid) != 0) | |
1334 | lwp = ptid_get_lwp (ptid); | |
1335 | else | |
1336 | lwp = ptid_get_pid (ptid); | |
1337 | ||
1338 | if (ptid_get_lwp (entry->id) == lwp) | |
1339 | return 1; | |
1340 | ||
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | struct lwp_info * | |
1345 | find_lwp_pid (ptid_t ptid) | |
1346 | { | |
1347 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1348 | } | |
1349 | ||
bd99dc85 | 1350 | static struct lwp_info * |
95954743 | 1351 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1352 | { |
0d62e5e8 | 1353 | int ret; |
95954743 | 1354 | int to_wait_for = -1; |
bd99dc85 | 1355 | struct lwp_info *child = NULL; |
0d62e5e8 | 1356 | |
bd99dc85 | 1357 | if (debug_threads) |
95954743 PA |
1358 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1359 | ||
1360 | if (ptid_equal (ptid, minus_one_ptid)) | |
1361 | to_wait_for = -1; /* any child */ | |
1362 | else | |
1363 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1364 | |
bd99dc85 | 1365 | options |= __WALL; |
0d62e5e8 | 1366 | |
bd99dc85 | 1367 | retry: |
0d62e5e8 | 1368 | |
bd99dc85 PA |
1369 | ret = my_waitpid (to_wait_for, wstatp, options); |
1370 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1371 | return NULL; | |
1372 | else if (ret == -1) | |
1373 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1374 | |
1375 | if (debug_threads | |
1376 | && (!WIFSTOPPED (*wstatp) | |
1377 | || (WSTOPSIG (*wstatp) != 32 | |
1378 | && WSTOPSIG (*wstatp) != 33))) | |
1379 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1380 | ||
95954743 | 1381 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1382 | |
24a09b5f DJ |
1383 | /* If we didn't find a process, one of two things presumably happened: |
1384 | - A process we started and then detached from has exited. Ignore it. | |
1385 | - A process we are controlling has forked and the new child's stop | |
1386 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1387 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f | 1388 | { |
05044653 | 1389 | add_to_pid_list (&stopped_pids, ret, *wstatp); |
24a09b5f DJ |
1390 | goto retry; |
1391 | } | |
bd99dc85 | 1392 | else if (child == NULL) |
24a09b5f DJ |
1393 | goto retry; |
1394 | ||
bd99dc85 | 1395 | child->stopped = 1; |
0d62e5e8 | 1396 | |
bd99dc85 | 1397 | child->last_status = *wstatp; |
32ca6d61 | 1398 | |
3aee8918 | 1399 | if (WIFSTOPPED (*wstatp)) |
d61ddec4 | 1400 | { |
3aee8918 PA |
1401 | struct process_info *proc; |
1402 | ||
1403 | /* Architecture-specific setup after inferior is running. This | |
1404 | needs to happen after we have attached to the inferior and it | |
1405 | is stopped for the first time, but before we access any | |
1406 | inferior registers. */ | |
1407 | proc = find_process_pid (pid_of (child)); | |
1408 | if (proc->private->new_inferior) | |
1409 | { | |
1410 | struct thread_info *saved_inferior; | |
1411 | ||
1412 | saved_inferior = current_inferior; | |
1413 | current_inferior = get_lwp_thread (child); | |
1414 | ||
1415 | the_low_target.arch_setup (); | |
1416 | ||
1417 | current_inferior = saved_inferior; | |
1418 | ||
1419 | proc->private->new_inferior = 0; | |
1420 | } | |
d61ddec4 UW |
1421 | } |
1422 | ||
c3adc08c PA |
1423 | /* Fetch the possibly triggered data watchpoint info and store it in |
1424 | CHILD. | |
1425 | ||
1426 | On some archs, like x86, that use debug registers to set | |
1427 | watchpoints, it's possible that the way to know which watched | |
1428 | address trapped, is to check the register that is used to select | |
1429 | which address to watch. Problem is, between setting the | |
1430 | watchpoint and reading back which data address trapped, the user | |
1431 | may change the set of watchpoints, and, as a consequence, GDB | |
1432 | changes the debug registers in the inferior. To avoid reading | |
1433 | back a stale stopped-data-address when that happens, we cache in | |
1434 | LP the fact that a watchpoint trapped, and the corresponding data | |
1435 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1436 | changes the debug registers meanwhile, we have the cached data we | |
1437 | can rely on. */ | |
1438 | ||
1439 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1440 | { | |
1441 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1442 | { | |
1443 | child->stopped_by_watchpoint = 0; | |
1444 | } | |
1445 | else | |
1446 | { | |
1447 | struct thread_info *saved_inferior; | |
1448 | ||
1449 | saved_inferior = current_inferior; | |
1450 | current_inferior = get_lwp_thread (child); | |
1451 | ||
1452 | child->stopped_by_watchpoint | |
1453 | = the_low_target.stopped_by_watchpoint (); | |
1454 | ||
1455 | if (child->stopped_by_watchpoint) | |
1456 | { | |
1457 | if (the_low_target.stopped_data_address != NULL) | |
1458 | child->stopped_data_address | |
1459 | = the_low_target.stopped_data_address (); | |
1460 | else | |
1461 | child->stopped_data_address = 0; | |
1462 | } | |
1463 | ||
1464 | current_inferior = saved_inferior; | |
1465 | } | |
1466 | } | |
1467 | ||
d50171e4 PA |
1468 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1469 | architecture being defined already (so that CHILD has a valid | |
1470 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1471 | not). */ | |
1472 | if (WIFSTOPPED (*wstatp)) | |
1473 | child->stop_pc = get_stop_pc (child); | |
1474 | ||
0d62e5e8 | 1475 | if (debug_threads |
47c0c975 DE |
1476 | && WIFSTOPPED (*wstatp) |
1477 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1478 | { |
896c7fbb | 1479 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1480 | struct regcache *regcache; |
47c0c975 DE |
1481 | CORE_ADDR pc; |
1482 | ||
d50171e4 | 1483 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1484 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1485 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1486 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1487 | current_inferior = saved_inferior; |
0d62e5e8 | 1488 | } |
bd99dc85 PA |
1489 | |
1490 | return child; | |
0d62e5e8 | 1491 | } |
611cb4a5 | 1492 | |
219f2f23 PA |
1493 | /* This function should only be called if the LWP got a SIGTRAP. |
1494 | ||
1495 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1496 | event was handled, 0 otherwise. */ | |
1497 | ||
1498 | static int | |
1499 | handle_tracepoints (struct lwp_info *lwp) | |
1500 | { | |
1501 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1502 | int tpoint_related_event = 0; | |
1503 | ||
7984d532 PA |
1504 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1505 | uninsert tracepoints. To do this, we temporarily pause all | |
1506 | threads, unpatch away, and then unpause threads. We need to make | |
1507 | sure the unpausing doesn't resume LWP too. */ | |
1508 | lwp->suspended++; | |
1509 | ||
219f2f23 PA |
1510 | /* And we need to be sure that any all-threads-stopping doesn't try |
1511 | to move threads out of the jump pads, as it could deadlock the | |
1512 | inferior (LWP could be in the jump pad, maybe even holding the | |
1513 | lock.) */ | |
1514 | ||
1515 | /* Do any necessary step collect actions. */ | |
1516 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1517 | ||
fa593d66 PA |
1518 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1519 | ||
219f2f23 PA |
1520 | /* See if we just hit a tracepoint and do its main collect |
1521 | actions. */ | |
1522 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1523 | ||
7984d532 PA |
1524 | lwp->suspended--; |
1525 | ||
1526 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1527 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1528 | |
219f2f23 PA |
1529 | if (tpoint_related_event) |
1530 | { | |
1531 | if (debug_threads) | |
1532 | fprintf (stderr, "got a tracepoint event\n"); | |
1533 | return 1; | |
1534 | } | |
1535 | ||
1536 | return 0; | |
1537 | } | |
1538 | ||
fa593d66 PA |
1539 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1540 | fast tracepoint. */ | |
1541 | ||
1542 | static int | |
1543 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1544 | struct fast_tpoint_collect_status *status) | |
1545 | { | |
1546 | CORE_ADDR thread_area; | |
1547 | ||
1548 | if (the_low_target.get_thread_area == NULL) | |
1549 | return 0; | |
1550 | ||
1551 | /* Get the thread area address. This is used to recognize which | |
1552 | thread is which when tracing with the in-process agent library. | |
1553 | We don't read anything from the address, and treat it as opaque; | |
1554 | it's the address itself that we assume is unique per-thread. */ | |
1555 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1556 | return 0; | |
1557 | ||
1558 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1559 | } | |
1560 | ||
1561 | /* The reason we resume in the caller, is because we want to be able | |
1562 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1563 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1564 | refuses to resume. */ | |
1565 | ||
1566 | static int | |
1567 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1568 | { | |
1569 | struct thread_info *saved_inferior; | |
1570 | ||
1571 | saved_inferior = current_inferior; | |
1572 | current_inferior = get_lwp_thread (lwp); | |
1573 | ||
1574 | if ((wstat == NULL | |
1575 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1576 | && supports_fast_tracepoints () | |
58b4daa5 | 1577 | && agent_loaded_p ()) |
fa593d66 PA |
1578 | { |
1579 | struct fast_tpoint_collect_status status; | |
1580 | int r; | |
1581 | ||
1582 | if (debug_threads) | |
1583 | fprintf (stderr, "\ | |
1584 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1585 | lwpid_of (lwp)); | |
1586 | ||
1587 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1588 | ||
1589 | if (wstat == NULL | |
1590 | || (WSTOPSIG (*wstat) != SIGILL | |
1591 | && WSTOPSIG (*wstat) != SIGFPE | |
1592 | && WSTOPSIG (*wstat) != SIGSEGV | |
1593 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1594 | { | |
1595 | lwp->collecting_fast_tracepoint = r; | |
1596 | ||
1597 | if (r != 0) | |
1598 | { | |
1599 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1600 | { | |
1601 | /* Haven't executed the original instruction yet. | |
1602 | Set breakpoint there, and wait till it's hit, | |
1603 | then single-step until exiting the jump pad. */ | |
1604 | lwp->exit_jump_pad_bkpt | |
1605 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1606 | } | |
1607 | ||
1608 | if (debug_threads) | |
1609 | fprintf (stderr, "\ | |
1610 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1611 | lwpid_of (lwp)); | |
0cccb683 | 1612 | current_inferior = saved_inferior; |
fa593d66 PA |
1613 | |
1614 | return 1; | |
1615 | } | |
1616 | } | |
1617 | else | |
1618 | { | |
1619 | /* If we get a synchronous signal while collecting, *and* | |
1620 | while executing the (relocated) original instruction, | |
1621 | reset the PC to point at the tpoint address, before | |
1622 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1623 | report the signal to GDB, and pray for the best. */ | |
1624 | ||
1625 | lwp->collecting_fast_tracepoint = 0; | |
1626 | ||
1627 | if (r != 0 | |
1628 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1629 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1630 | { | |
1631 | siginfo_t info; | |
1632 | struct regcache *regcache; | |
1633 | ||
1634 | /* The si_addr on a few signals references the address | |
1635 | of the faulting instruction. Adjust that as | |
1636 | well. */ | |
1637 | if ((WSTOPSIG (*wstat) == SIGILL | |
1638 | || WSTOPSIG (*wstat) == SIGFPE | |
1639 | || WSTOPSIG (*wstat) == SIGBUS | |
1640 | || WSTOPSIG (*wstat) == SIGSEGV) | |
56f7af9c MS |
1641 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), |
1642 | (PTRACE_ARG3_TYPE) 0, &info) == 0 | |
fa593d66 PA |
1643 | /* Final check just to make sure we don't clobber |
1644 | the siginfo of non-kernel-sent signals. */ | |
1645 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1646 | { | |
1647 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
56f7af9c MS |
1648 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), |
1649 | (PTRACE_ARG3_TYPE) 0, &info); | |
fa593d66 PA |
1650 | } |
1651 | ||
1652 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1653 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1654 | lwp->stop_pc = status.tpoint_addr; | |
1655 | ||
1656 | /* Cancel any fast tracepoint lock this thread was | |
1657 | holding. */ | |
1658 | force_unlock_trace_buffer (); | |
1659 | } | |
1660 | ||
1661 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1662 | { | |
1663 | if (debug_threads) | |
1664 | fprintf (stderr, | |
1665 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1666 | "stopping all threads momentarily.\n"); | |
1667 | ||
1668 | stop_all_lwps (1, lwp); | |
1669 | cancel_breakpoints (); | |
1670 | ||
1671 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1672 | lwp->exit_jump_pad_bkpt = NULL; | |
1673 | ||
1674 | unstop_all_lwps (1, lwp); | |
1675 | ||
1676 | gdb_assert (lwp->suspended >= 0); | |
1677 | } | |
1678 | } | |
1679 | } | |
1680 | ||
1681 | if (debug_threads) | |
1682 | fprintf (stderr, "\ | |
1683 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1684 | lwpid_of (lwp)); | |
0cccb683 YQ |
1685 | |
1686 | current_inferior = saved_inferior; | |
fa593d66 PA |
1687 | return 0; |
1688 | } | |
1689 | ||
1690 | /* Enqueue one signal in the "signals to report later when out of the | |
1691 | jump pad" list. */ | |
1692 | ||
1693 | static void | |
1694 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1695 | { | |
1696 | struct pending_signals *p_sig; | |
1697 | ||
1698 | if (debug_threads) | |
1699 | fprintf (stderr, "\ | |
1700 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1701 | ||
1702 | if (debug_threads) | |
1703 | { | |
1704 | struct pending_signals *sig; | |
1705 | ||
1706 | for (sig = lwp->pending_signals_to_report; | |
1707 | sig != NULL; | |
1708 | sig = sig->prev) | |
1709 | fprintf (stderr, | |
1710 | " Already queued %d\n", | |
1711 | sig->signal); | |
1712 | ||
1713 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1714 | } | |
1715 | ||
1a981360 PA |
1716 | /* Don't enqueue non-RT signals if they are already in the deferred |
1717 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1718 | twice) */ | |
1719 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1720 | { | |
1721 | struct pending_signals *sig; | |
1722 | ||
1723 | for (sig = lwp->pending_signals_to_report; | |
1724 | sig != NULL; | |
1725 | sig = sig->prev) | |
1726 | { | |
1727 | if (sig->signal == WSTOPSIG (*wstat)) | |
1728 | { | |
1729 | if (debug_threads) | |
1730 | fprintf (stderr, | |
1731 | "Not requeuing already queued non-RT signal %d" | |
1732 | " for LWP %ld\n", | |
1733 | sig->signal, | |
1734 | lwpid_of (lwp)); | |
1735 | return; | |
1736 | } | |
1737 | } | |
1738 | } | |
1739 | ||
fa593d66 PA |
1740 | p_sig = xmalloc (sizeof (*p_sig)); |
1741 | p_sig->prev = lwp->pending_signals_to_report; | |
1742 | p_sig->signal = WSTOPSIG (*wstat); | |
1743 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
56f7af9c MS |
1744 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
1745 | &p_sig->info); | |
fa593d66 PA |
1746 | |
1747 | lwp->pending_signals_to_report = p_sig; | |
1748 | } | |
1749 | ||
1750 | /* Dequeue one signal from the "signals to report later when out of | |
1751 | the jump pad" list. */ | |
1752 | ||
1753 | static int | |
1754 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1755 | { | |
1756 | if (lwp->pending_signals_to_report != NULL) | |
1757 | { | |
1758 | struct pending_signals **p_sig; | |
1759 | ||
1760 | p_sig = &lwp->pending_signals_to_report; | |
1761 | while ((*p_sig)->prev != NULL) | |
1762 | p_sig = &(*p_sig)->prev; | |
1763 | ||
1764 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1765 | if ((*p_sig)->info.si_signo != 0) | |
56f7af9c MS |
1766 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
1767 | &(*p_sig)->info); | |
fa593d66 PA |
1768 | free (*p_sig); |
1769 | *p_sig = NULL; | |
1770 | ||
1771 | if (debug_threads) | |
1772 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1773 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1774 | ||
1775 | if (debug_threads) | |
1776 | { | |
1777 | struct pending_signals *sig; | |
1778 | ||
1779 | for (sig = lwp->pending_signals_to_report; | |
1780 | sig != NULL; | |
1781 | sig = sig->prev) | |
1782 | fprintf (stderr, | |
1783 | " Still queued %d\n", | |
1784 | sig->signal); | |
1785 | ||
1786 | fprintf (stderr, " (no more queued signals)\n"); | |
1787 | } | |
1788 | ||
1789 | return 1; | |
1790 | } | |
1791 | ||
1792 | return 0; | |
1793 | } | |
1794 | ||
d50171e4 PA |
1795 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1796 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1797 | will handle the current event, eventually we will resume this LWP, | |
1798 | and this breakpoint will trap again. */ | |
1799 | ||
1800 | static int | |
1801 | cancel_breakpoint (struct lwp_info *lwp) | |
1802 | { | |
1803 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1804 | |
1805 | /* There's nothing to do if we don't support breakpoints. */ | |
1806 | if (!supports_breakpoints ()) | |
1807 | return 0; | |
1808 | ||
d50171e4 PA |
1809 | /* breakpoint_at reads from current inferior. */ |
1810 | saved_inferior = current_inferior; | |
1811 | current_inferior = get_lwp_thread (lwp); | |
1812 | ||
1813 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1814 | { | |
1815 | if (debug_threads) | |
1816 | fprintf (stderr, | |
1817 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1818 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1819 | |
1820 | /* Back up the PC if necessary. */ | |
1821 | if (the_low_target.decr_pc_after_break) | |
1822 | { | |
1823 | struct regcache *regcache | |
fc7238bb | 1824 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1825 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1826 | } | |
1827 | ||
1828 | current_inferior = saved_inferior; | |
1829 | return 1; | |
1830 | } | |
1831 | else | |
1832 | { | |
1833 | if (debug_threads) | |
1834 | fprintf (stderr, | |
1835 | "CB: No breakpoint found at %s for [%s]\n", | |
1836 | paddress (lwp->stop_pc), | |
fc7238bb | 1837 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1838 | } |
1839 | ||
1840 | current_inferior = saved_inferior; | |
1841 | return 0; | |
1842 | } | |
1843 | ||
1844 | /* When the event-loop is doing a step-over, this points at the thread | |
1845 | being stepped. */ | |
1846 | ptid_t step_over_bkpt; | |
1847 | ||
bd99dc85 PA |
1848 | /* Wait for an event from child PID. If PID is -1, wait for any |
1849 | child. Store the stop status through the status pointer WSTAT. | |
1850 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1851 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1852 | the stopped child otherwise. */ | |
1853 | ||
0d62e5e8 | 1854 | static int |
d8301ad1 | 1855 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1856 | { |
d50171e4 | 1857 | struct lwp_info *event_child, *requested_child; |
d8301ad1 | 1858 | ptid_t wait_ptid; |
d50171e4 | 1859 | |
d50171e4 PA |
1860 | event_child = NULL; |
1861 | requested_child = NULL; | |
0d62e5e8 | 1862 | |
95954743 | 1863 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1864 | |
e825046f | 1865 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
0d62e5e8 | 1866 | { |
54a0b537 | 1867 | event_child = (struct lwp_info *) |
d50171e4 | 1868 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1869 | if (debug_threads && event_child) |
bd99dc85 | 1870 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1871 | } |
1872 | else | |
1873 | { | |
95954743 | 1874 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1875 | |
bde24c0a | 1876 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
1877 | && requested_child->status_pending_p |
1878 | && requested_child->collecting_fast_tracepoint) | |
1879 | { | |
1880 | enqueue_one_deferred_signal (requested_child, | |
1881 | &requested_child->status_pending); | |
1882 | requested_child->status_pending_p = 0; | |
1883 | requested_child->status_pending = 0; | |
1884 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1885 | } | |
1886 | ||
1887 | if (requested_child->suspended | |
1888 | && requested_child->status_pending_p) | |
1889 | fatal ("requesting an event out of a suspended child?"); | |
1890 | ||
d50171e4 | 1891 | if (requested_child->status_pending_p) |
bd99dc85 | 1892 | event_child = requested_child; |
0d62e5e8 | 1893 | } |
611cb4a5 | 1894 | |
0d62e5e8 DJ |
1895 | if (event_child != NULL) |
1896 | { | |
bd99dc85 PA |
1897 | if (debug_threads) |
1898 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1899 | lwpid_of (event_child), event_child->status_pending); | |
1900 | *wstat = event_child->status_pending; | |
1901 | event_child->status_pending_p = 0; | |
1902 | event_child->status_pending = 0; | |
1903 | current_inferior = get_lwp_thread (event_child); | |
1904 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1905 | } |
1906 | ||
d8301ad1 JK |
1907 | if (ptid_is_pid (ptid)) |
1908 | { | |
1909 | /* A request to wait for a specific tgid. This is not possible | |
1910 | with waitpid, so instead, we wait for any child, and leave | |
1911 | children we're not interested in right now with a pending | |
1912 | status to report later. */ | |
1913 | wait_ptid = minus_one_ptid; | |
1914 | } | |
1915 | else | |
1916 | wait_ptid = ptid; | |
1917 | ||
0d62e5e8 DJ |
1918 | /* We only enter this loop if no process has a pending wait status. Thus |
1919 | any action taken in response to a wait status inside this loop is | |
1920 | responding as soon as we detect the status, not after any pending | |
1921 | events. */ | |
1922 | while (1) | |
1923 | { | |
d8301ad1 | 1924 | event_child = linux_wait_for_lwp (wait_ptid, wstat, options); |
0d62e5e8 | 1925 | |
bd99dc85 | 1926 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1927 | { |
1928 | if (debug_threads) | |
1929 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1930 | return 0; | |
1931 | } | |
0d62e5e8 DJ |
1932 | |
1933 | if (event_child == NULL) | |
1934 | error ("event from unknown child"); | |
611cb4a5 | 1935 | |
d8301ad1 JK |
1936 | if (ptid_is_pid (ptid) |
1937 | && ptid_get_pid (ptid) != ptid_get_pid (ptid_of (event_child))) | |
1938 | { | |
1939 | if (! WIFSTOPPED (*wstat)) | |
1940 | mark_lwp_dead (event_child, *wstat); | |
1941 | else | |
1942 | { | |
1943 | event_child->status_pending_p = 1; | |
1944 | event_child->status_pending = *wstat; | |
1945 | } | |
1946 | continue; | |
1947 | } | |
1948 | ||
bd99dc85 | 1949 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1950 | |
89be2091 | 1951 | /* Check for thread exit. */ |
bd99dc85 | 1952 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1953 | { |
89be2091 | 1954 | if (debug_threads) |
95954743 | 1955 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1956 | |
1957 | /* If the last thread is exiting, just return. */ | |
95954743 | 1958 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1959 | { |
1960 | if (debug_threads) | |
95954743 PA |
1961 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1962 | lwpid_of (event_child)); | |
bd99dc85 PA |
1963 | return lwpid_of (event_child); |
1964 | } | |
89be2091 | 1965 | |
bd99dc85 PA |
1966 | if (!non_stop) |
1967 | { | |
1968 | current_inferior = (struct thread_info *) all_threads.head; | |
1969 | if (debug_threads) | |
1970 | fprintf (stderr, "Current inferior is now %ld\n", | |
1971 | lwpid_of (get_thread_lwp (current_inferior))); | |
1972 | } | |
1973 | else | |
1974 | { | |
1975 | current_inferior = NULL; | |
1976 | if (debug_threads) | |
1977 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1978 | } | |
89be2091 DJ |
1979 | |
1980 | /* If we were waiting for this particular child to do something... | |
1981 | well, it did something. */ | |
bd99dc85 | 1982 | if (requested_child != NULL) |
d50171e4 PA |
1983 | { |
1984 | int lwpid = lwpid_of (event_child); | |
1985 | ||
1986 | /* Cancel the step-over operation --- the thread that | |
1987 | started it is gone. */ | |
1988 | if (finish_step_over (event_child)) | |
7984d532 | 1989 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1990 | delete_lwp (event_child); |
1991 | return lwpid; | |
1992 | } | |
1993 | ||
1994 | delete_lwp (event_child); | |
89be2091 DJ |
1995 | |
1996 | /* Wait for a more interesting event. */ | |
1997 | continue; | |
1998 | } | |
1999 | ||
a6dbe5df PA |
2000 | if (event_child->must_set_ptrace_flags) |
2001 | { | |
1e7fc18c | 2002 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
2003 | event_child->must_set_ptrace_flags = 0; |
2004 | } | |
2005 | ||
bd99dc85 PA |
2006 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
2007 | && *wstat >> 16 != 0) | |
24a09b5f | 2008 | { |
bd99dc85 | 2009 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
2010 | continue; |
2011 | } | |
2012 | ||
d50171e4 PA |
2013 | if (WIFSTOPPED (*wstat) |
2014 | && WSTOPSIG (*wstat) == SIGSTOP | |
2015 | && event_child->stop_expected) | |
2016 | { | |
2017 | int should_stop; | |
2018 | ||
2019 | if (debug_threads) | |
2020 | fprintf (stderr, "Expected stop.\n"); | |
2021 | event_child->stop_expected = 0; | |
2022 | ||
8336d594 | 2023 | should_stop = (current_inferior->last_resume_kind == resume_stop |
bde24c0a | 2024 | || stopping_threads != NOT_STOPPING_THREADS); |
d50171e4 PA |
2025 | |
2026 | if (!should_stop) | |
2027 | { | |
2028 | linux_resume_one_lwp (event_child, | |
2029 | event_child->stepping, 0, NULL); | |
2030 | continue; | |
2031 | } | |
2032 | } | |
2033 | ||
bd99dc85 | 2034 | return lwpid_of (event_child); |
611cb4a5 | 2035 | } |
0d62e5e8 | 2036 | |
611cb4a5 DJ |
2037 | /* NOTREACHED */ |
2038 | return 0; | |
2039 | } | |
2040 | ||
6bf5e0ba PA |
2041 | /* Count the LWP's that have had events. */ |
2042 | ||
2043 | static int | |
2044 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2045 | { | |
2046 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2047 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2048 | int *count = data; |
2049 | ||
2050 | gdb_assert (count != NULL); | |
2051 | ||
2052 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
2053 | should be reported to GDB. */ | |
8336d594 PA |
2054 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2055 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
2056 | && lp->status_pending_p |
2057 | && WIFSTOPPED (lp->status_pending) | |
2058 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2059 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2060 | (*count)++; | |
2061 | ||
2062 | return 0; | |
2063 | } | |
2064 | ||
2065 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2066 | ||
2067 | static int | |
2068 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2069 | { | |
2070 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2071 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 2072 | |
8336d594 PA |
2073 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2074 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2075 | && lp->status_pending_p) |
2076 | return 1; | |
2077 | else | |
2078 | return 0; | |
2079 | } | |
2080 | ||
2081 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2082 | reported to GDB. */ | |
2083 | ||
2084 | static int | |
2085 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2086 | { | |
2087 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2088 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2089 | int *selector = data; |
2090 | ||
2091 | gdb_assert (selector != NULL); | |
2092 | ||
2093 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
2094 | if (thread->last_resume_kind != resume_stop |
2095 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2096 | && lp->status_pending_p |
2097 | && WIFSTOPPED (lp->status_pending) | |
2098 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2099 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2100 | if ((*selector)-- == 0) | |
2101 | return 1; | |
2102 | ||
2103 | return 0; | |
2104 | } | |
2105 | ||
2106 | static int | |
2107 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
2108 | { | |
2109 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2110 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2111 | struct lwp_info *event_lp = data; |
2112 | ||
2113 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2114 | if (lp == event_lp) | |
2115 | return 0; | |
2116 | ||
2117 | /* If a LWP other than the LWP that we're reporting an event for has | |
2118 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2119 | then just arrange for it to hit it again later. We don't keep | |
2120 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2121 | LWP. We will handle the current event, eventually we will resume | |
2122 | all LWPs, and this one will get its breakpoint trap again. | |
2123 | ||
2124 | If we do not do this, then we run the risk that the user will | |
2125 | delete or disable the breakpoint, but the LWP will have already | |
2126 | tripped on it. */ | |
2127 | ||
8336d594 PA |
2128 | if (thread->last_resume_kind != resume_stop |
2129 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2130 | && lp->status_pending_p |
2131 | && WIFSTOPPED (lp->status_pending) | |
2132 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
2133 | && !lp->stepping |
2134 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
2135 | && cancel_breakpoint (lp)) |
2136 | /* Throw away the SIGTRAP. */ | |
2137 | lp->status_pending_p = 0; | |
2138 | ||
2139 | return 0; | |
2140 | } | |
2141 | ||
7984d532 PA |
2142 | static void |
2143 | linux_cancel_breakpoints (void) | |
2144 | { | |
2145 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
2146 | } | |
2147 | ||
6bf5e0ba PA |
2148 | /* Select one LWP out of those that have events pending. */ |
2149 | ||
2150 | static void | |
2151 | select_event_lwp (struct lwp_info **orig_lp) | |
2152 | { | |
2153 | int num_events = 0; | |
2154 | int random_selector; | |
2155 | struct lwp_info *event_lp; | |
2156 | ||
2157 | /* Give preference to any LWP that is being single-stepped. */ | |
2158 | event_lp | |
2159 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2160 | select_singlestep_lwp_callback, NULL); | |
2161 | if (event_lp != NULL) | |
2162 | { | |
2163 | if (debug_threads) | |
2164 | fprintf (stderr, | |
2165 | "SEL: Select single-step %s\n", | |
2166 | target_pid_to_str (ptid_of (event_lp))); | |
2167 | } | |
2168 | else | |
2169 | { | |
2170 | /* No single-stepping LWP. Select one at random, out of those | |
2171 | which have had SIGTRAP events. */ | |
2172 | ||
2173 | /* First see how many SIGTRAP events we have. */ | |
2174 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
2175 | ||
2176 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2177 | random_selector = (int) | |
2178 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2179 | ||
2180 | if (debug_threads && num_events > 1) | |
2181 | fprintf (stderr, | |
2182 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2183 | num_events, random_selector); | |
2184 | ||
2185 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
2186 | select_event_lwp_callback, | |
2187 | &random_selector); | |
2188 | } | |
2189 | ||
2190 | if (event_lp != NULL) | |
2191 | { | |
2192 | /* Switch the event LWP. */ | |
2193 | *orig_lp = event_lp; | |
2194 | } | |
2195 | } | |
2196 | ||
7984d532 PA |
2197 | /* Decrement the suspend count of an LWP. */ |
2198 | ||
2199 | static int | |
2200 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2201 | { | |
2202 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2203 | ||
2204 | /* Ignore EXCEPT. */ | |
2205 | if (lwp == except) | |
2206 | return 0; | |
2207 | ||
2208 | lwp->suspended--; | |
2209 | ||
2210 | gdb_assert (lwp->suspended >= 0); | |
2211 | return 0; | |
2212 | } | |
2213 | ||
2214 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2215 | NULL. */ | |
2216 | ||
2217 | static void | |
2218 | unsuspend_all_lwps (struct lwp_info *except) | |
2219 | { | |
2220 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
2221 | } | |
2222 | ||
fa593d66 PA |
2223 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2224 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2225 | void *data); | |
2226 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2227 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2228 | struct target_waitstatus *ourstatus, | |
2229 | int target_options); | |
2230 | ||
2231 | /* Stabilize threads (move out of jump pads). | |
2232 | ||
2233 | If a thread is midway collecting a fast tracepoint, we need to | |
2234 | finish the collection and move it out of the jump pad before | |
2235 | reporting the signal. | |
2236 | ||
2237 | This avoids recursion while collecting (when a signal arrives | |
2238 | midway, and the signal handler itself collects), which would trash | |
2239 | the trace buffer. In case the user set a breakpoint in a signal | |
2240 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2241 | Most importantly, there are certain things we can't do safely if | |
2242 | threads are stopped in a jump pad (or in its callee's). For | |
2243 | example: | |
2244 | ||
2245 | - starting a new trace run. A thread still collecting the | |
2246 | previous run, could trash the trace buffer when resumed. The trace | |
2247 | buffer control structures would have been reset but the thread had | |
2248 | no way to tell. The thread could even midway memcpy'ing to the | |
2249 | buffer, which would mean that when resumed, it would clobber the | |
2250 | trace buffer that had been set for a new run. | |
2251 | ||
2252 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2253 | safely. Say you do tstart while a thread is stopped midway while | |
2254 | collecting. When the thread is later resumed, it finishes the | |
2255 | collection, and returns to the jump pad, to execute the original | |
2256 | instruction that was under the tracepoint jump at the time the | |
2257 | older run had been started. If the jump pad had been rewritten | |
2258 | since for something else in the new run, the thread would now | |
2259 | execute the wrong / random instructions. */ | |
2260 | ||
2261 | static void | |
2262 | linux_stabilize_threads (void) | |
2263 | { | |
2264 | struct thread_info *save_inferior; | |
2265 | struct lwp_info *lwp_stuck; | |
2266 | ||
2267 | lwp_stuck | |
2268 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2269 | stuck_in_jump_pad_callback, NULL); | |
2270 | if (lwp_stuck != NULL) | |
2271 | { | |
b4d51a55 PA |
2272 | if (debug_threads) |
2273 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
2274 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2275 | return; |
2276 | } | |
2277 | ||
2278 | save_inferior = current_inferior; | |
2279 | ||
2280 | stabilizing_threads = 1; | |
2281 | ||
2282 | /* Kick 'em all. */ | |
2283 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2284 | ||
2285 | /* Loop until all are stopped out of the jump pads. */ | |
2286 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2287 | { | |
2288 | struct target_waitstatus ourstatus; | |
2289 | struct lwp_info *lwp; | |
fa593d66 PA |
2290 | int wstat; |
2291 | ||
2292 | /* Note that we go through the full wait even loop. While | |
2293 | moving threads out of jump pad, we need to be able to step | |
2294 | over internal breakpoints and such. */ | |
32fcada3 | 2295 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2296 | |
2297 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2298 | { | |
2299 | lwp = get_thread_lwp (current_inferior); | |
2300 | ||
2301 | /* Lock it. */ | |
2302 | lwp->suspended++; | |
2303 | ||
a493e3e2 | 2304 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
fa593d66 PA |
2305 | || current_inferior->last_resume_kind == resume_stop) |
2306 | { | |
2ea28649 | 2307 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2308 | enqueue_one_deferred_signal (lwp, &wstat); |
2309 | } | |
2310 | } | |
2311 | } | |
2312 | ||
2313 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2314 | ||
2315 | stabilizing_threads = 0; | |
2316 | ||
2317 | current_inferior = save_inferior; | |
2318 | ||
b4d51a55 | 2319 | if (debug_threads) |
fa593d66 | 2320 | { |
b4d51a55 PA |
2321 | lwp_stuck |
2322 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2323 | stuck_in_jump_pad_callback, NULL); | |
2324 | if (lwp_stuck != NULL) | |
fa593d66 PA |
2325 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2326 | lwpid_of (lwp_stuck)); | |
2327 | } | |
2328 | } | |
2329 | ||
0d62e5e8 | 2330 | /* Wait for process, returns status. */ |
da6d8c04 | 2331 | |
95954743 PA |
2332 | static ptid_t |
2333 | linux_wait_1 (ptid_t ptid, | |
2334 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2335 | { |
e5f1222d | 2336 | int w; |
fc7238bb | 2337 | struct lwp_info *event_child; |
bd99dc85 | 2338 | int options; |
bd99dc85 | 2339 | int pid; |
6bf5e0ba PA |
2340 | int step_over_finished; |
2341 | int bp_explains_trap; | |
2342 | int maybe_internal_trap; | |
2343 | int report_to_gdb; | |
219f2f23 | 2344 | int trace_event; |
c2d6af84 | 2345 | int in_step_range; |
bd99dc85 PA |
2346 | |
2347 | /* Translate generic target options into linux options. */ | |
2348 | options = __WALL; | |
2349 | if (target_options & TARGET_WNOHANG) | |
2350 | options |= WNOHANG; | |
0d62e5e8 DJ |
2351 | |
2352 | retry: | |
fa593d66 PA |
2353 | bp_explains_trap = 0; |
2354 | trace_event = 0; | |
c2d6af84 | 2355 | in_step_range = 0; |
bd99dc85 PA |
2356 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2357 | ||
0d62e5e8 DJ |
2358 | /* If we were only supposed to resume one thread, only wait for |
2359 | that thread - if it's still alive. If it died, however - which | |
2360 | can happen if we're coming from the thread death case below - | |
2361 | then we need to make sure we restart the other threads. We could | |
2362 | pick a thread at random or restart all; restarting all is less | |
2363 | arbitrary. */ | |
95954743 PA |
2364 | if (!non_stop |
2365 | && !ptid_equal (cont_thread, null_ptid) | |
2366 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2367 | { |
fc7238bb PA |
2368 | struct thread_info *thread; |
2369 | ||
bd99dc85 PA |
2370 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2371 | cont_thread); | |
0d62e5e8 DJ |
2372 | |
2373 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2374 | if (thread == NULL) |
64386c31 DJ |
2375 | { |
2376 | struct thread_resume resume_info; | |
95954743 | 2377 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2378 | resume_info.kind = resume_continue; |
2379 | resume_info.sig = 0; | |
2bd7c093 | 2380 | linux_resume (&resume_info, 1); |
64386c31 | 2381 | } |
bd99dc85 | 2382 | else |
95954743 | 2383 | ptid = cont_thread; |
0d62e5e8 | 2384 | } |
da6d8c04 | 2385 | |
6bf5e0ba PA |
2386 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2387 | pid = linux_wait_for_event (ptid, &w, options); | |
2388 | else | |
2389 | { | |
2390 | if (debug_threads) | |
2391 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2392 | target_pid_to_str (step_over_bkpt)); | |
2393 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2394 | } | |
2395 | ||
bd99dc85 | 2396 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2397 | return null_ptid; |
bd99dc85 | 2398 | |
6bf5e0ba | 2399 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2400 | |
0d62e5e8 DJ |
2401 | /* If we are waiting for a particular child, and it exited, |
2402 | linux_wait_for_event will return its exit status. Similarly if | |
2403 | the last child exited. If this is not the last child, however, | |
2404 | do not report it as exited until there is a 'thread exited' response | |
2405 | available in the remote protocol. Instead, just wait for another event. | |
2406 | This should be safe, because if the thread crashed we will already | |
2407 | have reported the termination signal to GDB; that should stop any | |
2408 | in-progress stepping operations, etc. | |
2409 | ||
2410 | Report the exit status of the last thread to exit. This matches | |
2411 | LinuxThreads' behavior. */ | |
2412 | ||
95954743 | 2413 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2414 | { |
bd99dc85 | 2415 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2416 | { |
bd99dc85 PA |
2417 | if (WIFEXITED (w)) |
2418 | { | |
2419 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2420 | ourstatus->value.integer = WEXITSTATUS (w); | |
2421 | ||
2422 | if (debug_threads) | |
493e2a69 MS |
2423 | fprintf (stderr, |
2424 | "\nChild exited with retcode = %x \n", | |
2425 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2426 | } |
2427 | else | |
2428 | { | |
2429 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2ea28649 | 2430 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); |
bd99dc85 PA |
2431 | |
2432 | if (debug_threads) | |
493e2a69 MS |
2433 | fprintf (stderr, |
2434 | "\nChild terminated with signal = %x \n", | |
2435 | WTERMSIG (w)); | |
bd99dc85 PA |
2436 | |
2437 | } | |
5b1c542e | 2438 | |
3e4c1235 | 2439 | return ptid_of (event_child); |
0d62e5e8 | 2440 | } |
da6d8c04 | 2441 | } |
0d62e5e8 | 2442 | else |
da6d8c04 | 2443 | { |
0d62e5e8 DJ |
2444 | if (!WIFSTOPPED (w)) |
2445 | goto retry; | |
da6d8c04 DJ |
2446 | } |
2447 | ||
6bf5e0ba PA |
2448 | /* If this event was not handled before, and is not a SIGTRAP, we |
2449 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2450 | a breakpoint is inserted at the current PC. If this target does | |
2451 | not support internal breakpoints at all, we also report the | |
2452 | SIGTRAP without further processing; it's of no concern to us. */ | |
2453 | maybe_internal_trap | |
2454 | = (supports_breakpoints () | |
2455 | && (WSTOPSIG (w) == SIGTRAP | |
2456 | || ((WSTOPSIG (w) == SIGILL | |
2457 | || WSTOPSIG (w) == SIGSEGV) | |
2458 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2459 | ||
2460 | if (maybe_internal_trap) | |
2461 | { | |
2462 | /* Handle anything that requires bookkeeping before deciding to | |
2463 | report the event or continue waiting. */ | |
2464 | ||
2465 | /* First check if we can explain the SIGTRAP with an internal | |
2466 | breakpoint, or if we should possibly report the event to GDB. | |
2467 | Do this before anything that may remove or insert a | |
2468 | breakpoint. */ | |
2469 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2470 | ||
2471 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2472 | finished. If so, tweak the state machine accordingly, | |
2473 | reinsert breakpoints and delete any reinsert (software | |
2474 | single-step) breakpoints. */ | |
2475 | step_over_finished = finish_step_over (event_child); | |
2476 | ||
2477 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2478 | check_breakpoints (event_child->stop_pc); | |
2479 | ||
219f2f23 PA |
2480 | /* Handle tracepoint data collecting. This may overflow the |
2481 | trace buffer, and cause a tracing stop, removing | |
2482 | breakpoints. */ | |
2483 | trace_event = handle_tracepoints (event_child); | |
2484 | ||
6bf5e0ba PA |
2485 | if (bp_explains_trap) |
2486 | { | |
2487 | /* If we stepped or ran into an internal breakpoint, we've | |
2488 | already handled it. So next time we resume (from this | |
2489 | PC), we should step over it. */ | |
2490 | if (debug_threads) | |
2491 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2492 | ||
8b07ae33 PA |
2493 | if (breakpoint_here (event_child->stop_pc)) |
2494 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2495 | } |
2496 | } | |
2497 | else | |
2498 | { | |
2499 | /* We have some other signal, possibly a step-over dance was in | |
2500 | progress, and it should be cancelled too. */ | |
2501 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2502 | } |
2503 | ||
2504 | /* We have all the data we need. Either report the event to GDB, or | |
2505 | resume threads and keep waiting for more. */ | |
2506 | ||
2507 | /* If we're collecting a fast tracepoint, finish the collection and | |
2508 | move out of the jump pad before delivering a signal. See | |
2509 | linux_stabilize_threads. */ | |
2510 | ||
2511 | if (WIFSTOPPED (w) | |
2512 | && WSTOPSIG (w) != SIGTRAP | |
2513 | && supports_fast_tracepoints () | |
58b4daa5 | 2514 | && agent_loaded_p ()) |
fa593d66 PA |
2515 | { |
2516 | if (debug_threads) | |
2517 | fprintf (stderr, | |
2518 | "Got signal %d for LWP %ld. Check if we need " | |
2519 | "to defer or adjust it.\n", | |
2520 | WSTOPSIG (w), lwpid_of (event_child)); | |
2521 | ||
2522 | /* Allow debugging the jump pad itself. */ | |
2523 | if (current_inferior->last_resume_kind != resume_step | |
2524 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2525 | { | |
2526 | enqueue_one_deferred_signal (event_child, &w); | |
2527 | ||
2528 | if (debug_threads) | |
2529 | fprintf (stderr, | |
2530 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2531 | WSTOPSIG (w), lwpid_of (event_child)); | |
2532 | ||
2533 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2534 | goto retry; | |
2535 | } | |
2536 | } | |
219f2f23 | 2537 | |
fa593d66 PA |
2538 | if (event_child->collecting_fast_tracepoint) |
2539 | { | |
2540 | if (debug_threads) | |
2541 | fprintf (stderr, "\ | |
2542 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2543 | Check if we're already there.\n", | |
2544 | lwpid_of (event_child), | |
2545 | event_child->collecting_fast_tracepoint); | |
2546 | ||
2547 | trace_event = 1; | |
2548 | ||
2549 | event_child->collecting_fast_tracepoint | |
2550 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2551 | ||
2552 | if (event_child->collecting_fast_tracepoint != 1) | |
2553 | { | |
2554 | /* No longer need this breakpoint. */ | |
2555 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2556 | { | |
2557 | if (debug_threads) | |
2558 | fprintf (stderr, | |
2559 | "No longer need exit-jump-pad bkpt; removing it." | |
2560 | "stopping all threads momentarily.\n"); | |
2561 | ||
2562 | /* Other running threads could hit this breakpoint. | |
2563 | We don't handle moribund locations like GDB does, | |
2564 | instead we always pause all threads when removing | |
2565 | breakpoints, so that any step-over or | |
2566 | decr_pc_after_break adjustment is always taken | |
2567 | care of while the breakpoint is still | |
2568 | inserted. */ | |
2569 | stop_all_lwps (1, event_child); | |
2570 | cancel_breakpoints (); | |
2571 | ||
2572 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2573 | event_child->exit_jump_pad_bkpt = NULL; | |
2574 | ||
2575 | unstop_all_lwps (1, event_child); | |
2576 | ||
2577 | gdb_assert (event_child->suspended >= 0); | |
2578 | } | |
2579 | } | |
2580 | ||
2581 | if (event_child->collecting_fast_tracepoint == 0) | |
2582 | { | |
2583 | if (debug_threads) | |
2584 | fprintf (stderr, | |
2585 | "fast tracepoint finished " | |
2586 | "collecting successfully.\n"); | |
2587 | ||
2588 | /* We may have a deferred signal to report. */ | |
2589 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2590 | { | |
2591 | if (debug_threads) | |
2592 | fprintf (stderr, "dequeued one signal.\n"); | |
2593 | } | |
3c11dd79 | 2594 | else |
fa593d66 | 2595 | { |
3c11dd79 PA |
2596 | if (debug_threads) |
2597 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2598 | |
2599 | if (stabilizing_threads) | |
2600 | { | |
2601 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2602 | ourstatus->value.sig = GDB_SIGNAL_0; |
fa593d66 PA |
2603 | return ptid_of (event_child); |
2604 | } | |
2605 | } | |
2606 | } | |
6bf5e0ba PA |
2607 | } |
2608 | ||
e471f25b PA |
2609 | /* Check whether GDB would be interested in this event. */ |
2610 | ||
2611 | /* If GDB is not interested in this signal, don't stop other | |
2612 | threads, and don't report it to GDB. Just resume the inferior | |
2613 | right away. We do this for threading-related signals as well as | |
2614 | any that GDB specifically requested we ignore. But never ignore | |
2615 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2616 | stepping - they may require special handling to skip the signal | |
2617 | handler. */ | |
2618 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2619 | thread library? */ | |
2620 | if (WIFSTOPPED (w) | |
2621 | && current_inferior->last_resume_kind != resume_step | |
2622 | && ( | |
1a981360 | 2623 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2624 | (current_process ()->private->thread_db != NULL |
2625 | && (WSTOPSIG (w) == __SIGRTMIN | |
2626 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2627 | || | |
2628 | #endif | |
2ea28649 | 2629 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b PA |
2630 | && !(WSTOPSIG (w) == SIGSTOP |
2631 | && current_inferior->last_resume_kind == resume_stop)))) | |
2632 | { | |
2633 | siginfo_t info, *info_p; | |
2634 | ||
2635 | if (debug_threads) | |
2636 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2637 | WSTOPSIG (w), lwpid_of (event_child)); | |
2638 | ||
56f7af9c MS |
2639 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), |
2640 | (PTRACE_ARG3_TYPE) 0, &info) == 0) | |
e471f25b PA |
2641 | info_p = &info; |
2642 | else | |
2643 | info_p = NULL; | |
2644 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2645 | WSTOPSIG (w), info_p); | |
2646 | goto retry; | |
2647 | } | |
2648 | ||
c2d6af84 PA |
2649 | /* Note that all addresses are always "out of the step range" when |
2650 | there's no range to begin with. */ | |
2651 | in_step_range = lwp_in_step_range (event_child); | |
2652 | ||
2653 | /* If GDB wanted this thread to single step, and the thread is out | |
2654 | of the step range, we always want to report the SIGTRAP, and let | |
2655 | GDB handle it. Watchpoints should always be reported. So should | |
2656 | signals we can't explain. A SIGTRAP we can't explain could be a | |
2657 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
2658 | do, we're be able to handle GDB breakpoints on top of internal | |
2659 | breakpoints, by handling the internal breakpoint and still | |
2660 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
2661 | won't see the breakpoint hit. */ | |
6bf5e0ba | 2662 | report_to_gdb = (!maybe_internal_trap |
c2d6af84 PA |
2663 | || (current_inferior->last_resume_kind == resume_step |
2664 | && !in_step_range) | |
6bf5e0ba | 2665 | || event_child->stopped_by_watchpoint |
c2d6af84 | 2666 | || (!step_over_finished && !in_step_range |
493e2a69 | 2667 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 2668 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2669 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2670 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2671 | ||
2672 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2673 | |
2674 | /* We found no reason GDB would want us to stop. We either hit one | |
2675 | of our own breakpoints, or finished an internal step GDB | |
2676 | shouldn't know about. */ | |
2677 | if (!report_to_gdb) | |
2678 | { | |
2679 | if (debug_threads) | |
2680 | { | |
2681 | if (bp_explains_trap) | |
2682 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2683 | if (step_over_finished) | |
2684 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2685 | if (trace_event) |
2686 | fprintf (stderr, "Tracepoint event.\n"); | |
c2d6af84 PA |
2687 | if (lwp_in_step_range (event_child)) |
2688 | fprintf (stderr, "Range stepping pc 0x%s [0x%s, 0x%s).\n", | |
2689 | paddress (event_child->stop_pc), | |
2690 | paddress (event_child->step_range_start), | |
2691 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
2692 | } |
2693 | ||
2694 | /* We're not reporting this breakpoint to GDB, so apply the | |
2695 | decr_pc_after_break adjustment to the inferior's regcache | |
2696 | ourselves. */ | |
2697 | ||
2698 | if (the_low_target.set_pc != NULL) | |
2699 | { | |
2700 | struct regcache *regcache | |
2701 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2702 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2703 | } | |
2704 | ||
7984d532 PA |
2705 | /* We may have finished stepping over a breakpoint. If so, |
2706 | we've stopped and suspended all LWPs momentarily except the | |
2707 | stepping one. This is where we resume them all again. We're | |
2708 | going to keep waiting, so use proceed, which handles stepping | |
2709 | over the next breakpoint. */ | |
6bf5e0ba PA |
2710 | if (debug_threads) |
2711 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2712 | |
2713 | if (step_over_finished) | |
2714 | unsuspend_all_lwps (event_child); | |
2715 | ||
6bf5e0ba PA |
2716 | proceed_all_lwps (); |
2717 | goto retry; | |
2718 | } | |
2719 | ||
2720 | if (debug_threads) | |
2721 | { | |
8336d594 | 2722 | if (current_inferior->last_resume_kind == resume_step) |
c2d6af84 PA |
2723 | { |
2724 | if (event_child->step_range_start == event_child->step_range_end) | |
2725 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); | |
2726 | else if (!lwp_in_step_range (event_child)) | |
2727 | fprintf (stderr, "Out of step range, reporting event.\n"); | |
2728 | } | |
6bf5e0ba PA |
2729 | if (event_child->stopped_by_watchpoint) |
2730 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2731 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2732 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2733 | if (debug_threads) |
2734 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2735 | } | |
2736 | ||
2737 | /* Alright, we're going to report a stop. */ | |
2738 | ||
fa593d66 | 2739 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2740 | { |
2741 | /* In all-stop, stop all threads. */ | |
7984d532 | 2742 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2743 | |
2744 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2745 | from among those that have had events. Giving equal priority | |
2746 | to all LWPs that have had events helps prevent | |
2747 | starvation. */ | |
2748 | if (ptid_equal (ptid, minus_one_ptid)) | |
2749 | { | |
2750 | event_child->status_pending_p = 1; | |
2751 | event_child->status_pending = w; | |
2752 | ||
2753 | select_event_lwp (&event_child); | |
2754 | ||
2755 | event_child->status_pending_p = 0; | |
2756 | w = event_child->status_pending; | |
2757 | } | |
2758 | ||
2759 | /* Now that we've selected our final event LWP, cancel any | |
2760 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2761 | See the comment in cancel_breakpoints_callback to find out | |
2762 | why. */ | |
2763 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 | 2764 | |
c03e6ccc YQ |
2765 | /* If we were going a step-over, all other threads but the stepping one |
2766 | had been paused in start_step_over, with their suspend counts | |
2767 | incremented. We don't want to do a full unstop/unpause, because we're | |
2768 | in all-stop mode (so we want threads stopped), but we still need to | |
2769 | unsuspend the other threads, to decrement their `suspended' count | |
2770 | back. */ | |
2771 | if (step_over_finished) | |
2772 | unsuspend_all_lwps (event_child); | |
2773 | ||
fa593d66 PA |
2774 | /* Stabilize threads (move out of jump pads). */ |
2775 | stabilize_threads (); | |
6bf5e0ba PA |
2776 | } |
2777 | else | |
2778 | { | |
2779 | /* If we just finished a step-over, then all threads had been | |
2780 | momentarily paused. In all-stop, that's fine, we want | |
2781 | threads stopped by now anyway. In non-stop, we need to | |
2782 | re-resume threads that GDB wanted to be running. */ | |
2783 | if (step_over_finished) | |
7984d532 | 2784 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2785 | } |
2786 | ||
5b1c542e | 2787 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2788 | |
8336d594 PA |
2789 | if (current_inferior->last_resume_kind == resume_stop |
2790 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2791 | { |
2792 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2793 | and it stopped cleanly, so report as SIG0. The use of | |
2794 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2795 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2796 | } |
8336d594 PA |
2797 | else if (current_inferior->last_resume_kind == resume_stop |
2798 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2799 | { |
2800 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2801 | but, it stopped for other reasons. */ |
2ea28649 | 2802 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2803 | } |
2804 | else | |
2805 | { | |
2ea28649 | 2806 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2807 | } |
2808 | ||
d50171e4 PA |
2809 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2810 | ||
bd99dc85 | 2811 | if (debug_threads) |
95954743 | 2812 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2813 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2814 | ourstatus->kind, |
2815 | ourstatus->value.sig); | |
2816 | ||
6bf5e0ba | 2817 | return ptid_of (event_child); |
bd99dc85 PA |
2818 | } |
2819 | ||
2820 | /* Get rid of any pending event in the pipe. */ | |
2821 | static void | |
2822 | async_file_flush (void) | |
2823 | { | |
2824 | int ret; | |
2825 | char buf; | |
2826 | ||
2827 | do | |
2828 | ret = read (linux_event_pipe[0], &buf, 1); | |
2829 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2830 | } | |
2831 | ||
2832 | /* Put something in the pipe, so the event loop wakes up. */ | |
2833 | static void | |
2834 | async_file_mark (void) | |
2835 | { | |
2836 | int ret; | |
2837 | ||
2838 | async_file_flush (); | |
2839 | ||
2840 | do | |
2841 | ret = write (linux_event_pipe[1], "+", 1); | |
2842 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2843 | ||
2844 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2845 | be awakened anyway. */ | |
2846 | } | |
2847 | ||
95954743 PA |
2848 | static ptid_t |
2849 | linux_wait (ptid_t ptid, | |
2850 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2851 | { |
95954743 | 2852 | ptid_t event_ptid; |
bd99dc85 PA |
2853 | |
2854 | if (debug_threads) | |
95954743 | 2855 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2856 | |
2857 | /* Flush the async file first. */ | |
2858 | if (target_is_async_p ()) | |
2859 | async_file_flush (); | |
2860 | ||
95954743 | 2861 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2862 | |
2863 | /* If at least one stop was reported, there may be more. A single | |
2864 | SIGCHLD can signal more than one child stop. */ | |
2865 | if (target_is_async_p () | |
2866 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2867 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2868 | async_file_mark (); |
2869 | ||
2870 | return event_ptid; | |
da6d8c04 DJ |
2871 | } |
2872 | ||
c5f62d5f | 2873 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2874 | |
2875 | static int | |
a1928bad | 2876 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2877 | { |
c5f62d5f DE |
2878 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2879 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2880 | |
c5f62d5f DE |
2881 | #ifdef __NR_tkill |
2882 | { | |
2883 | static int tkill_failed; | |
fd500816 | 2884 | |
c5f62d5f DE |
2885 | if (!tkill_failed) |
2886 | { | |
2887 | int ret; | |
2888 | ||
2889 | errno = 0; | |
2890 | ret = syscall (__NR_tkill, lwpid, signo); | |
2891 | if (errno != ENOSYS) | |
2892 | return ret; | |
2893 | tkill_failed = 1; | |
2894 | } | |
2895 | } | |
fd500816 DJ |
2896 | #endif |
2897 | ||
2898 | return kill (lwpid, signo); | |
2899 | } | |
2900 | ||
964e4306 PA |
2901 | void |
2902 | linux_stop_lwp (struct lwp_info *lwp) | |
2903 | { | |
2904 | send_sigstop (lwp); | |
2905 | } | |
2906 | ||
0d62e5e8 | 2907 | static void |
02fc4de7 | 2908 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2909 | { |
bd99dc85 | 2910 | int pid; |
0d62e5e8 | 2911 | |
bd99dc85 PA |
2912 | pid = lwpid_of (lwp); |
2913 | ||
0d62e5e8 DJ |
2914 | /* If we already have a pending stop signal for this process, don't |
2915 | send another. */ | |
54a0b537 | 2916 | if (lwp->stop_expected) |
0d62e5e8 | 2917 | { |
ae13219e | 2918 | if (debug_threads) |
bd99dc85 | 2919 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2920 | |
0d62e5e8 DJ |
2921 | return; |
2922 | } | |
2923 | ||
2924 | if (debug_threads) | |
bd99dc85 | 2925 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2926 | |
d50171e4 | 2927 | lwp->stop_expected = 1; |
bd99dc85 | 2928 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2929 | } |
2930 | ||
7984d532 PA |
2931 | static int |
2932 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2933 | { |
2934 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2935 | ||
7984d532 PA |
2936 | /* Ignore EXCEPT. */ |
2937 | if (lwp == except) | |
2938 | return 0; | |
2939 | ||
02fc4de7 | 2940 | if (lwp->stopped) |
7984d532 | 2941 | return 0; |
02fc4de7 PA |
2942 | |
2943 | send_sigstop (lwp); | |
7984d532 PA |
2944 | return 0; |
2945 | } | |
2946 | ||
2947 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2948 | yet. */ | |
2949 | static int | |
2950 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2951 | void *except) | |
2952 | { | |
2953 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2954 | ||
2955 | /* Ignore EXCEPT. */ | |
2956 | if (lwp == except) | |
2957 | return 0; | |
2958 | ||
2959 | lwp->suspended++; | |
2960 | ||
2961 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2962 | } |
2963 | ||
95954743 PA |
2964 | static void |
2965 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2966 | { | |
2967 | /* It's dead, really. */ | |
2968 | lwp->dead = 1; | |
2969 | ||
2970 | /* Store the exit status for later. */ | |
2971 | lwp->status_pending_p = 1; | |
2972 | lwp->status_pending = wstat; | |
2973 | ||
95954743 PA |
2974 | /* Prevent trying to stop it. */ |
2975 | lwp->stopped = 1; | |
2976 | ||
2977 | /* No further stops are expected from a dead lwp. */ | |
2978 | lwp->stop_expected = 0; | |
2979 | } | |
2980 | ||
0d62e5e8 DJ |
2981 | static void |
2982 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2983 | { | |
54a0b537 | 2984 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2985 | struct thread_info *saved_inferior; |
a1928bad | 2986 | int wstat; |
95954743 PA |
2987 | ptid_t saved_tid; |
2988 | ptid_t ptid; | |
d50171e4 | 2989 | int pid; |
0d62e5e8 | 2990 | |
54a0b537 | 2991 | if (lwp->stopped) |
d50171e4 PA |
2992 | { |
2993 | if (debug_threads) | |
2994 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2995 | lwpid_of (lwp)); | |
2996 | return; | |
2997 | } | |
0d62e5e8 DJ |
2998 | |
2999 | saved_inferior = current_inferior; | |
bd99dc85 PA |
3000 | if (saved_inferior != NULL) |
3001 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
3002 | else | |
95954743 | 3003 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3004 | |
95954743 | 3005 | ptid = lwp->head.id; |
bd99dc85 | 3006 | |
d50171e4 PA |
3007 | if (debug_threads) |
3008 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
3009 | ||
3010 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
3011 | |
3012 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
3013 | and record the pending SIGSTOP. If the process exited, just | |
3014 | return. */ | |
d50171e4 | 3015 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
3016 | { |
3017 | if (debug_threads) | |
d50171e4 PA |
3018 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
3019 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 3020 | |
d50171e4 | 3021 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
3022 | { |
3023 | if (debug_threads) | |
d50171e4 PA |
3024 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
3025 | lwpid_of (lwp), wstat); | |
3026 | ||
c35fafde PA |
3027 | lwp->status_pending_p = 1; |
3028 | lwp->status_pending = wstat; | |
3029 | } | |
0d62e5e8 | 3030 | } |
d50171e4 | 3031 | else |
95954743 PA |
3032 | { |
3033 | if (debug_threads) | |
d50171e4 | 3034 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 3035 | |
d50171e4 PA |
3036 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
3037 | if (lwp) | |
3038 | { | |
3039 | /* Leave this status pending for the next time we're able to | |
3040 | report it. In the mean time, we'll report this lwp as | |
3041 | dead to GDB, so GDB doesn't try to read registers and | |
3042 | memory from it. This can only happen if this was the | |
3043 | last thread of the process; otherwise, PID is removed | |
3044 | from the thread tables before linux_wait_for_event | |
3045 | returns. */ | |
3046 | mark_lwp_dead (lwp, wstat); | |
3047 | } | |
95954743 | 3048 | } |
0d62e5e8 | 3049 | |
bd99dc85 | 3050 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
3051 | current_inferior = saved_inferior; |
3052 | else | |
3053 | { | |
3054 | if (debug_threads) | |
3055 | fprintf (stderr, "Previously current thread died.\n"); | |
3056 | ||
bd99dc85 PA |
3057 | if (non_stop) |
3058 | { | |
3059 | /* We can't change the current inferior behind GDB's back, | |
3060 | otherwise, a subsequent command may apply to the wrong | |
3061 | process. */ | |
3062 | current_inferior = NULL; | |
3063 | } | |
3064 | else | |
3065 | { | |
3066 | /* Set a valid thread as current. */ | |
3067 | set_desired_inferior (0); | |
3068 | } | |
0d62e5e8 DJ |
3069 | } |
3070 | } | |
3071 | ||
fa593d66 PA |
3072 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3073 | move it out, because we need to report the stop event to GDB. For | |
3074 | example, if the user puts a breakpoint in the jump pad, it's | |
3075 | because she wants to debug it. */ | |
3076 | ||
3077 | static int | |
3078 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3079 | { | |
3080 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3081 | struct thread_info *thread = get_lwp_thread (lwp); | |
3082 | ||
3083 | gdb_assert (lwp->suspended == 0); | |
3084 | gdb_assert (lwp->stopped); | |
3085 | ||
3086 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3087 | return (supports_fast_tracepoints () | |
58b4daa5 | 3088 | && agent_loaded_p () |
fa593d66 PA |
3089 | && (gdb_breakpoint_here (lwp->stop_pc) |
3090 | || lwp->stopped_by_watchpoint | |
3091 | || thread->last_resume_kind == resume_step) | |
3092 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3093 | } | |
3094 | ||
3095 | static void | |
3096 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3097 | { | |
3098 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3099 | struct thread_info *thread = get_lwp_thread (lwp); | |
3100 | int *wstat; | |
3101 | ||
3102 | gdb_assert (lwp->suspended == 0); | |
3103 | gdb_assert (lwp->stopped); | |
3104 | ||
3105 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3106 | ||
3107 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3108 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
3109 | && !lwp->stopped_by_watchpoint | |
3110 | && thread->last_resume_kind != resume_step | |
3111 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3112 | { | |
3113 | if (debug_threads) | |
3114 | fprintf (stderr, | |
3115 | "LWP %ld needs stabilizing (in jump pad)\n", | |
3116 | lwpid_of (lwp)); | |
3117 | ||
3118 | if (wstat) | |
3119 | { | |
3120 | lwp->status_pending_p = 0; | |
3121 | enqueue_one_deferred_signal (lwp, wstat); | |
3122 | ||
3123 | if (debug_threads) | |
3124 | fprintf (stderr, | |
3125 | "Signal %d for LWP %ld deferred " | |
3126 | "(in jump pad)\n", | |
3127 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
3128 | } | |
3129 | ||
3130 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3131 | } | |
3132 | else | |
3133 | lwp->suspended++; | |
3134 | } | |
3135 | ||
3136 | static int | |
3137 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3138 | { | |
3139 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3140 | ||
3141 | if (lwp->dead) | |
3142 | return 0; | |
3143 | if (lwp->stopped) | |
3144 | return 0; | |
3145 | return 1; | |
3146 | } | |
3147 | ||
7984d532 PA |
3148 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3149 | If SUSPEND, then also increase the suspend count of every LWP, | |
3150 | except EXCEPT. */ | |
3151 | ||
0d62e5e8 | 3152 | static void |
7984d532 | 3153 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3154 | { |
bde24c0a PA |
3155 | /* Should not be called recursively. */ |
3156 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3157 | ||
3158 | stopping_threads = (suspend | |
3159 | ? STOPPING_AND_SUSPENDING_THREADS | |
3160 | : STOPPING_THREADS); | |
7984d532 PA |
3161 | |
3162 | if (suspend) | |
3163 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
3164 | else | |
3165 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 3166 | for_each_inferior (&all_lwps, wait_for_sigstop); |
bde24c0a | 3167 | stopping_threads = NOT_STOPPING_THREADS; |
0d62e5e8 DJ |
3168 | } |
3169 | ||
da6d8c04 DJ |
3170 | /* Resume execution of the inferior process. |
3171 | If STEP is nonzero, single-step it. | |
3172 | If SIGNAL is nonzero, give it that signal. */ | |
3173 | ||
ce3a066d | 3174 | static void |
2acc282a | 3175 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3176 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3177 | { |
0d62e5e8 | 3178 | struct thread_info *saved_inferior; |
fa593d66 | 3179 | int fast_tp_collecting; |
0d62e5e8 | 3180 | |
54a0b537 | 3181 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3182 | return; |
3183 | ||
fa593d66 PA |
3184 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3185 | ||
3186 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3187 | ||
219f2f23 PA |
3188 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3189 | user used the "jump" command, or "set $pc = foo"). */ | |
3190 | if (lwp->stop_pc != get_pc (lwp)) | |
3191 | { | |
3192 | /* Collecting 'while-stepping' actions doesn't make sense | |
3193 | anymore. */ | |
3194 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
3195 | } | |
3196 | ||
0d62e5e8 DJ |
3197 | /* If we have pending signals or status, and a new signal, enqueue the |
3198 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3199 | breakpoint; it will be picked up again below. */ | |
3200 | if (signal != 0 | |
fa593d66 PA |
3201 | && (lwp->status_pending_p |
3202 | || lwp->pending_signals != NULL | |
3203 | || lwp->bp_reinsert != 0 | |
3204 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3205 | { |
3206 | struct pending_signals *p_sig; | |
bca929d3 | 3207 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3208 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3209 | p_sig->signal = signal; |
32ca6d61 DJ |
3210 | if (info == NULL) |
3211 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3212 | else | |
3213 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3214 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3215 | } |
3216 | ||
d50171e4 PA |
3217 | if (lwp->status_pending_p) |
3218 | { | |
3219 | if (debug_threads) | |
3220 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
3221 | " has pending status\n", | |
3222 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
3223 | lwp->stop_expected ? "expected" : "not expected"); | |
3224 | return; | |
3225 | } | |
0d62e5e8 DJ |
3226 | |
3227 | saved_inferior = current_inferior; | |
54a0b537 | 3228 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
3229 | |
3230 | if (debug_threads) | |
1b3f6016 | 3231 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 3232 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 3233 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3234 | |
3235 | /* This bit needs some thinking about. If we get a signal that | |
3236 | we must report while a single-step reinsert is still pending, | |
3237 | we often end up resuming the thread. It might be better to | |
3238 | (ew) allow a stack of pending events; then we could be sure that | |
3239 | the reinsert happened right away and not lose any signals. | |
3240 | ||
3241 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3242 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3243 | complete correctness, so it won't solve that problem. It may be |
3244 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3245 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3246 | { |
3247 | if (debug_threads) | |
d50171e4 PA |
3248 | fprintf (stderr, " pending reinsert at 0x%s\n", |
3249 | paddress (lwp->bp_reinsert)); | |
3250 | ||
85e00e85 | 3251 | if (can_hardware_single_step ()) |
d50171e4 | 3252 | { |
fa593d66 PA |
3253 | if (fast_tp_collecting == 0) |
3254 | { | |
3255 | if (step == 0) | |
3256 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3257 | if (lwp->suspended) | |
3258 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3259 | lwp->suspended); | |
3260 | } | |
d50171e4 PA |
3261 | |
3262 | step = 1; | |
3263 | } | |
0d62e5e8 DJ |
3264 | |
3265 | /* Postpone any pending signal. It was enqueued above. */ | |
3266 | signal = 0; | |
3267 | } | |
3268 | ||
fa593d66 PA |
3269 | if (fast_tp_collecting == 1) |
3270 | { | |
3271 | if (debug_threads) | |
3272 | fprintf (stderr, "\ | |
3273 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
3274 | lwpid_of (lwp)); | |
3275 | ||
3276 | /* Postpone any pending signal. It was enqueued above. */ | |
3277 | signal = 0; | |
3278 | } | |
3279 | else if (fast_tp_collecting == 2) | |
3280 | { | |
3281 | if (debug_threads) | |
3282 | fprintf (stderr, "\ | |
3283 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
3284 | lwpid_of (lwp)); | |
3285 | ||
3286 | if (can_hardware_single_step ()) | |
3287 | step = 1; | |
3288 | else | |
3289 | fatal ("moving out of jump pad single-stepping" | |
3290 | " not implemented on this target"); | |
3291 | ||
3292 | /* Postpone any pending signal. It was enqueued above. */ | |
3293 | signal = 0; | |
3294 | } | |
3295 | ||
219f2f23 PA |
3296 | /* If we have while-stepping actions in this thread set it stepping. |
3297 | If we have a signal to deliver, it may or may not be set to | |
3298 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3299 | while-stepping into a signal handler. A possible smart thing to | |
3300 | do would be to set an internal breakpoint at the signal return | |
3301 | address, continue, and carry on catching this while-stepping | |
3302 | action only when that breakpoint is hit. A future | |
3303 | enhancement. */ | |
3304 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
3305 | && can_hardware_single_step ()) | |
3306 | { | |
3307 | if (debug_threads) | |
3308 | fprintf (stderr, | |
3309 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
3310 | lwpid_of (lwp)); | |
3311 | step = 1; | |
3312 | } | |
3313 | ||
aa691b87 | 3314 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3315 | { |
442ea881 PA |
3316 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3317 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 3318 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3319 | } |
3320 | ||
fa593d66 PA |
3321 | /* If we have pending signals, consume one unless we are trying to |
3322 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3323 | collect. */ | |
3324 | if (lwp->pending_signals != NULL | |
3325 | && lwp->bp_reinsert == 0 | |
3326 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3327 | { |
3328 | struct pending_signals **p_sig; | |
3329 | ||
54a0b537 | 3330 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3331 | while ((*p_sig)->prev != NULL) |
3332 | p_sig = &(*p_sig)->prev; | |
3333 | ||
3334 | signal = (*p_sig)->signal; | |
32ca6d61 | 3335 | if ((*p_sig)->info.si_signo != 0) |
56f7af9c MS |
3336 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
3337 | &(*p_sig)->info); | |
32ca6d61 | 3338 | |
0d62e5e8 DJ |
3339 | free (*p_sig); |
3340 | *p_sig = NULL; | |
3341 | } | |
3342 | ||
aa5ca48f DE |
3343 | if (the_low_target.prepare_to_resume != NULL) |
3344 | the_low_target.prepare_to_resume (lwp); | |
3345 | ||
3aee8918 | 3346 | regcache_invalidate_thread (get_lwp_thread (lwp)); |
da6d8c04 | 3347 | errno = 0; |
54a0b537 | 3348 | lwp->stopped = 0; |
c3adc08c | 3349 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3350 | lwp->stepping = step; |
56f7af9c MS |
3351 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), |
3352 | (PTRACE_ARG3_TYPE) 0, | |
14ce3065 DE |
3353 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3354 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3355 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
3356 | |
3357 | current_inferior = saved_inferior; | |
da6d8c04 | 3358 | if (errno) |
3221518c UW |
3359 | { |
3360 | /* ESRCH from ptrace either means that the thread was already | |
3361 | running (an error) or that it is gone (a race condition). If | |
3362 | it's gone, we will get a notification the next time we wait, | |
3363 | so we can ignore the error. We could differentiate these | |
3364 | two, but it's tricky without waiting; the thread still exists | |
3365 | as a zombie, so sending it signal 0 would succeed. So just | |
3366 | ignore ESRCH. */ | |
3367 | if (errno == ESRCH) | |
3368 | return; | |
3369 | ||
3370 | perror_with_name ("ptrace"); | |
3371 | } | |
da6d8c04 DJ |
3372 | } |
3373 | ||
2bd7c093 PA |
3374 | struct thread_resume_array |
3375 | { | |
3376 | struct thread_resume *resume; | |
3377 | size_t n; | |
3378 | }; | |
64386c31 DJ |
3379 | |
3380 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
3381 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
3382 | resume request. | |
3383 | ||
3384 | This algorithm is O(threads * resume elements), but resume elements | |
3385 | is small (and will remain small at least until GDB supports thread | |
3386 | suspension). */ | |
2bd7c093 PA |
3387 | static int |
3388 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3389 | { |
54a0b537 | 3390 | struct lwp_info *lwp; |
64386c31 | 3391 | struct thread_info *thread; |
5544ad89 | 3392 | int ndx; |
2bd7c093 | 3393 | struct thread_resume_array *r; |
64386c31 DJ |
3394 | |
3395 | thread = (struct thread_info *) entry; | |
54a0b537 | 3396 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3397 | r = arg; |
64386c31 | 3398 | |
2bd7c093 | 3399 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3400 | { |
3401 | ptid_t ptid = r->resume[ndx].thread; | |
3402 | if (ptid_equal (ptid, minus_one_ptid) | |
3403 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3404 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3405 | of PID'. */ | |
3406 | || (ptid_get_pid (ptid) == pid_of (lwp) | |
3407 | && (ptid_is_pid (ptid) | |
3408 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3409 | { |
d50171e4 | 3410 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3411 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3412 | { |
3413 | if (debug_threads) | |
3414 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3415 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3416 | ? "stopped" | |
3417 | : "stopping", | |
3418 | lwpid_of (lwp)); | |
3419 | ||
3420 | continue; | |
3421 | } | |
3422 | ||
95954743 | 3423 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3424 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3425 | |
c2d6af84 PA |
3426 | lwp->step_range_start = lwp->resume->step_range_start; |
3427 | lwp->step_range_end = lwp->resume->step_range_end; | |
3428 | ||
fa593d66 PA |
3429 | /* If we had a deferred signal to report, dequeue one now. |
3430 | This can happen if LWP gets more than one signal while | |
3431 | trying to get out of a jump pad. */ | |
3432 | if (lwp->stopped | |
3433 | && !lwp->status_pending_p | |
3434 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3435 | { | |
3436 | lwp->status_pending_p = 1; | |
3437 | ||
3438 | if (debug_threads) | |
3439 | fprintf (stderr, | |
3440 | "Dequeueing deferred signal %d for LWP %ld, " | |
3441 | "leaving status pending.\n", | |
3442 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3443 | } | |
3444 | ||
95954743 PA |
3445 | return 0; |
3446 | } | |
3447 | } | |
2bd7c093 PA |
3448 | |
3449 | /* No resume action for this thread. */ | |
3450 | lwp->resume = NULL; | |
64386c31 | 3451 | |
2bd7c093 | 3452 | return 0; |
5544ad89 DJ |
3453 | } |
3454 | ||
5544ad89 | 3455 | |
bd99dc85 PA |
3456 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3457 | static int | |
3458 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3459 | { |
bd99dc85 | 3460 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3461 | |
bd99dc85 PA |
3462 | /* LWPs which will not be resumed are not interesting, because |
3463 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3464 | if (lwp->resume == NULL) |
bd99dc85 | 3465 | return 0; |
64386c31 | 3466 | |
bd99dc85 | 3467 | if (lwp->status_pending_p) |
d50171e4 PA |
3468 | * (int *) flag_p = 1; |
3469 | ||
3470 | return 0; | |
3471 | } | |
3472 | ||
3473 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3474 | internal breakpoint that we need to step over. It assumes that any | |
3475 | required STOP_PC adjustment has already been propagated to the | |
3476 | inferior's regcache. */ | |
3477 | ||
3478 | static int | |
3479 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3480 | { | |
3481 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3482 | struct thread_info *thread; |
d50171e4 PA |
3483 | struct thread_info *saved_inferior; |
3484 | CORE_ADDR pc; | |
3485 | ||
3486 | /* LWPs which will not be resumed are not interesting, because we | |
3487 | might not wait for them next time through linux_wait. */ | |
3488 | ||
3489 | if (!lwp->stopped) | |
3490 | { | |
3491 | if (debug_threads) | |
3492 | fprintf (stderr, | |
3493 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3494 | lwpid_of (lwp)); | |
3495 | return 0; | |
3496 | } | |
3497 | ||
8336d594 PA |
3498 | thread = get_lwp_thread (lwp); |
3499 | ||
3500 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3501 | { |
3502 | if (debug_threads) | |
3503 | fprintf (stderr, | |
3504 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3505 | lwpid_of (lwp)); | |
3506 | return 0; | |
3507 | } | |
3508 | ||
7984d532 PA |
3509 | gdb_assert (lwp->suspended >= 0); |
3510 | ||
3511 | if (lwp->suspended) | |
3512 | { | |
3513 | if (debug_threads) | |
3514 | fprintf (stderr, | |
3515 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3516 | lwpid_of (lwp)); | |
3517 | return 0; | |
3518 | } | |
3519 | ||
d50171e4 PA |
3520 | if (!lwp->need_step_over) |
3521 | { | |
3522 | if (debug_threads) | |
3523 | fprintf (stderr, | |
3524 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3525 | } | |
5544ad89 | 3526 | |
bd99dc85 | 3527 | if (lwp->status_pending_p) |
d50171e4 PA |
3528 | { |
3529 | if (debug_threads) | |
3530 | fprintf (stderr, | |
3531 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3532 | lwpid_of (lwp)); | |
3533 | return 0; | |
3534 | } | |
3535 | ||
3536 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3537 | or we have. */ | |
3538 | pc = get_pc (lwp); | |
3539 | ||
3540 | /* If the PC has changed since we stopped, then don't do anything, | |
3541 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3542 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3543 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3544 | command, or poked thread's registers herself. */ | |
3545 | if (pc != lwp->stop_pc) | |
3546 | { | |
3547 | if (debug_threads) | |
3548 | fprintf (stderr, | |
3549 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3550 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3551 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3552 | ||
3553 | lwp->need_step_over = 0; | |
3554 | return 0; | |
3555 | } | |
3556 | ||
3557 | saved_inferior = current_inferior; | |
8336d594 | 3558 | current_inferior = thread; |
d50171e4 | 3559 | |
8b07ae33 | 3560 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3561 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3562 | { |
8b07ae33 | 3563 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3564 | though. If the condition is being evaluated on the target's side |
3565 | and it evaluate to false, step over this breakpoint as well. */ | |
3566 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3567 | && gdb_condition_true_at_breakpoint (pc) |
3568 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3569 | { |
3570 | if (debug_threads) | |
3571 | fprintf (stderr, | |
3572 | "Need step over [LWP %ld]? yes, but found" | |
3573 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3574 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3575 | |
8b07ae33 PA |
3576 | current_inferior = saved_inferior; |
3577 | return 0; | |
3578 | } | |
3579 | else | |
3580 | { | |
3581 | if (debug_threads) | |
3582 | fprintf (stderr, | |
493e2a69 MS |
3583 | "Need step over [LWP %ld]? yes, " |
3584 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3585 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3586 | |
8b07ae33 PA |
3587 | /* We've found an lwp that needs stepping over --- return 1 so |
3588 | that find_inferior stops looking. */ | |
3589 | current_inferior = saved_inferior; | |
3590 | ||
3591 | /* If the step over is cancelled, this is set again. */ | |
3592 | lwp->need_step_over = 0; | |
3593 | return 1; | |
3594 | } | |
d50171e4 PA |
3595 | } |
3596 | ||
3597 | current_inferior = saved_inferior; | |
3598 | ||
3599 | if (debug_threads) | |
3600 | fprintf (stderr, | |
3601 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3602 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3603 | |
bd99dc85 | 3604 | return 0; |
5544ad89 DJ |
3605 | } |
3606 | ||
d50171e4 PA |
3607 | /* Start a step-over operation on LWP. When LWP stopped at a |
3608 | breakpoint, to make progress, we need to remove the breakpoint out | |
3609 | of the way. If we let other threads run while we do that, they may | |
3610 | pass by the breakpoint location and miss hitting it. To avoid | |
3611 | that, a step-over momentarily stops all threads while LWP is | |
3612 | single-stepped while the breakpoint is temporarily uninserted from | |
3613 | the inferior. When the single-step finishes, we reinsert the | |
3614 | breakpoint, and let all threads that are supposed to be running, | |
3615 | run again. | |
3616 | ||
3617 | On targets that don't support hardware single-step, we don't | |
3618 | currently support full software single-stepping. Instead, we only | |
3619 | support stepping over the thread event breakpoint, by asking the | |
3620 | low target where to place a reinsert breakpoint. Since this | |
3621 | routine assumes the breakpoint being stepped over is a thread event | |
3622 | breakpoint, it usually assumes the return address of the current | |
3623 | function is a good enough place to set the reinsert breakpoint. */ | |
3624 | ||
3625 | static int | |
3626 | start_step_over (struct lwp_info *lwp) | |
3627 | { | |
3628 | struct thread_info *saved_inferior; | |
3629 | CORE_ADDR pc; | |
3630 | int step; | |
3631 | ||
3632 | if (debug_threads) | |
3633 | fprintf (stderr, | |
3634 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3635 | lwpid_of (lwp)); | |
3636 | ||
7984d532 PA |
3637 | stop_all_lwps (1, lwp); |
3638 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3639 | |
3640 | if (debug_threads) | |
3641 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3642 | ||
3643 | /* Note, we should always reach here with an already adjusted PC, | |
3644 | either by GDB (if we're resuming due to GDB's request), or by our | |
3645 | caller, if we just finished handling an internal breakpoint GDB | |
3646 | shouldn't care about. */ | |
3647 | pc = get_pc (lwp); | |
3648 | ||
3649 | saved_inferior = current_inferior; | |
3650 | current_inferior = get_lwp_thread (lwp); | |
3651 | ||
3652 | lwp->bp_reinsert = pc; | |
3653 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3654 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3655 | |
3656 | if (can_hardware_single_step ()) | |
3657 | { | |
3658 | step = 1; | |
3659 | } | |
3660 | else | |
3661 | { | |
3662 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3663 | set_reinsert_breakpoint (raddr); | |
3664 | step = 0; | |
3665 | } | |
3666 | ||
3667 | current_inferior = saved_inferior; | |
3668 | ||
3669 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3670 | ||
3671 | /* Require next event from this LWP. */ | |
3672 | step_over_bkpt = lwp->head.id; | |
3673 | return 1; | |
3674 | } | |
3675 | ||
3676 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3677 | start_step_over, if still there, and delete any reinsert | |
3678 | breakpoints we've set, on non hardware single-step targets. */ | |
3679 | ||
3680 | static int | |
3681 | finish_step_over (struct lwp_info *lwp) | |
3682 | { | |
3683 | if (lwp->bp_reinsert != 0) | |
3684 | { | |
3685 | if (debug_threads) | |
3686 | fprintf (stderr, "Finished step over.\n"); | |
3687 | ||
3688 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3689 | may be no breakpoint to reinsert there by now. */ | |
3690 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3691 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3692 | |
3693 | lwp->bp_reinsert = 0; | |
3694 | ||
3695 | /* Delete any software-single-step reinsert breakpoints. No | |
3696 | longer needed. We don't have to worry about other threads | |
3697 | hitting this trap, and later not being able to explain it, | |
3698 | because we were stepping over a breakpoint, and we hold all | |
3699 | threads but LWP stopped while doing that. */ | |
3700 | if (!can_hardware_single_step ()) | |
3701 | delete_reinsert_breakpoints (); | |
3702 | ||
3703 | step_over_bkpt = null_ptid; | |
3704 | return 1; | |
3705 | } | |
3706 | else | |
3707 | return 0; | |
3708 | } | |
3709 | ||
5544ad89 DJ |
3710 | /* This function is called once per thread. We check the thread's resume |
3711 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3712 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3713 | |
bd99dc85 PA |
3714 | For threads which we aren't explicitly told otherwise, we preserve |
3715 | the stepping flag; this is used for stepping over gdbserver-placed | |
3716 | breakpoints. | |
3717 | ||
3718 | If pending_flags was set in any thread, we queue any needed | |
3719 | signals, since we won't actually resume. We already have a pending | |
3720 | event to report, so we don't need to preserve any step requests; | |
3721 | they should be re-issued if necessary. */ | |
3722 | ||
3723 | static int | |
3724 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3725 | { |
54a0b537 | 3726 | struct lwp_info *lwp; |
5544ad89 | 3727 | struct thread_info *thread; |
bd99dc85 | 3728 | int step; |
d50171e4 PA |
3729 | int leave_all_stopped = * (int *) arg; |
3730 | int leave_pending; | |
5544ad89 DJ |
3731 | |
3732 | thread = (struct thread_info *) entry; | |
54a0b537 | 3733 | lwp = get_thread_lwp (thread); |
5544ad89 | 3734 | |
2bd7c093 | 3735 | if (lwp->resume == NULL) |
bd99dc85 | 3736 | return 0; |
5544ad89 | 3737 | |
bd99dc85 | 3738 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3739 | { |
bd99dc85 | 3740 | if (debug_threads) |
d50171e4 | 3741 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3742 | |
3743 | if (!lwp->stopped) | |
3744 | { | |
3745 | if (debug_threads) | |
d50171e4 | 3746 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3747 | |
d50171e4 PA |
3748 | /* Stop the thread, and wait for the event asynchronously, |
3749 | through the event loop. */ | |
02fc4de7 | 3750 | send_sigstop (lwp); |
bd99dc85 PA |
3751 | } |
3752 | else | |
3753 | { | |
3754 | if (debug_threads) | |
d50171e4 PA |
3755 | fprintf (stderr, "already stopped LWP %ld\n", |
3756 | lwpid_of (lwp)); | |
3757 | ||
3758 | /* The LWP may have been stopped in an internal event that | |
3759 | was not meant to be notified back to GDB (e.g., gdbserver | |
3760 | breakpoint), so we should be reporting a stop event in | |
3761 | this case too. */ | |
3762 | ||
3763 | /* If the thread already has a pending SIGSTOP, this is a | |
3764 | no-op. Otherwise, something later will presumably resume | |
3765 | the thread and this will cause it to cancel any pending | |
3766 | operation, due to last_resume_kind == resume_stop. If | |
3767 | the thread already has a pending status to report, we | |
3768 | will still report it the next time we wait - see | |
3769 | status_pending_p_callback. */ | |
1a981360 PA |
3770 | |
3771 | /* If we already have a pending signal to report, then | |
3772 | there's no need to queue a SIGSTOP, as this means we're | |
3773 | midway through moving the LWP out of the jumppad, and we | |
3774 | will report the pending signal as soon as that is | |
3775 | finished. */ | |
3776 | if (lwp->pending_signals_to_report == NULL) | |
3777 | send_sigstop (lwp); | |
bd99dc85 | 3778 | } |
32ca6d61 | 3779 | |
bd99dc85 PA |
3780 | /* For stop requests, we're done. */ |
3781 | lwp->resume = NULL; | |
fc7238bb | 3782 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3783 | return 0; |
5544ad89 DJ |
3784 | } |
3785 | ||
bd99dc85 PA |
3786 | /* If this thread which is about to be resumed has a pending status, |
3787 | then don't resume any threads - we can just report the pending | |
3788 | status. Make sure to queue any signals that would otherwise be | |
3789 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3790 | thread has a pending status. If there's a thread that needs the |
3791 | step-over-breakpoint dance, then don't resume any other thread | |
3792 | but that particular one. */ | |
3793 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3794 | |
d50171e4 | 3795 | if (!leave_pending) |
bd99dc85 PA |
3796 | { |
3797 | if (debug_threads) | |
3798 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3799 | |
d50171e4 | 3800 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3801 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3802 | } |
3803 | else | |
3804 | { | |
3805 | if (debug_threads) | |
3806 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3807 | |
bd99dc85 PA |
3808 | /* If we have a new signal, enqueue the signal. */ |
3809 | if (lwp->resume->sig != 0) | |
3810 | { | |
3811 | struct pending_signals *p_sig; | |
3812 | p_sig = xmalloc (sizeof (*p_sig)); | |
3813 | p_sig->prev = lwp->pending_signals; | |
3814 | p_sig->signal = lwp->resume->sig; | |
3815 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3816 | ||
3817 | /* If this is the same signal we were previously stopped by, | |
3818 | make sure to queue its siginfo. We can ignore the return | |
3819 | value of ptrace; if it fails, we'll skip | |
3820 | PTRACE_SETSIGINFO. */ | |
3821 | if (WIFSTOPPED (lwp->last_status) | |
3822 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
56f7af9c MS |
3823 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
3824 | &p_sig->info); | |
bd99dc85 PA |
3825 | |
3826 | lwp->pending_signals = p_sig; | |
3827 | } | |
3828 | } | |
5544ad89 | 3829 | |
fc7238bb | 3830 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3831 | lwp->resume = NULL; |
5544ad89 | 3832 | return 0; |
0d62e5e8 DJ |
3833 | } |
3834 | ||
3835 | static void | |
2bd7c093 | 3836 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3837 | { |
2bd7c093 | 3838 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3839 | struct lwp_info *need_step_over = NULL; |
3840 | int any_pending; | |
3841 | int leave_all_stopped; | |
c6ecbae5 | 3842 | |
2bd7c093 | 3843 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3844 | |
d50171e4 PA |
3845 | /* If there is a thread which would otherwise be resumed, which has |
3846 | a pending status, then don't resume any threads - we can just | |
3847 | report the pending status. Make sure to queue any signals that | |
3848 | would otherwise be sent. In non-stop mode, we'll apply this | |
3849 | logic to each thread individually. We consume all pending events | |
3850 | before considering to start a step-over (in all-stop). */ | |
3851 | any_pending = 0; | |
bd99dc85 | 3852 | if (!non_stop) |
d50171e4 PA |
3853 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3854 | ||
3855 | /* If there is a thread which would otherwise be resumed, which is | |
3856 | stopped at a breakpoint that needs stepping over, then don't | |
3857 | resume any threads - have it step over the breakpoint with all | |
3858 | other threads stopped, then resume all threads again. Make sure | |
3859 | to queue any signals that would otherwise be delivered or | |
3860 | queued. */ | |
3861 | if (!any_pending && supports_breakpoints ()) | |
3862 | need_step_over | |
3863 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3864 | need_step_over_p, NULL); | |
3865 | ||
3866 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3867 | ||
3868 | if (debug_threads) | |
3869 | { | |
3870 | if (need_step_over != NULL) | |
3871 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3872 | else if (any_pending) | |
3873 | fprintf (stderr, | |
3874 | "Not resuming, all-stop and found " | |
3875 | "an LWP with pending status\n"); | |
3876 | else | |
3877 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3878 | } | |
3879 | ||
3880 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3881 | otherwise deliver. */ | |
3882 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3883 | ||
3884 | if (need_step_over) | |
3885 | start_step_over (need_step_over); | |
3886 | } | |
3887 | ||
3888 | /* This function is called once per thread. We check the thread's | |
3889 | last resume request, which will tell us whether to resume, step, or | |
3890 | leave the thread stopped. Any signal the client requested to be | |
3891 | delivered has already been enqueued at this point. | |
3892 | ||
3893 | If any thread that GDB wants running is stopped at an internal | |
3894 | breakpoint that needs stepping over, we start a step-over operation | |
3895 | on that particular thread, and leave all others stopped. */ | |
3896 | ||
7984d532 PA |
3897 | static int |
3898 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3899 | { |
7984d532 | 3900 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3901 | struct thread_info *thread; |
d50171e4 PA |
3902 | int step; |
3903 | ||
7984d532 PA |
3904 | if (lwp == except) |
3905 | return 0; | |
d50171e4 PA |
3906 | |
3907 | if (debug_threads) | |
3908 | fprintf (stderr, | |
3909 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3910 | ||
3911 | if (!lwp->stopped) | |
3912 | { | |
3913 | if (debug_threads) | |
3914 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3915 | return 0; |
d50171e4 PA |
3916 | } |
3917 | ||
8336d594 PA |
3918 | thread = get_lwp_thread (lwp); |
3919 | ||
02fc4de7 PA |
3920 | if (thread->last_resume_kind == resume_stop |
3921 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3922 | { |
3923 | if (debug_threads) | |
02fc4de7 PA |
3924 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3925 | lwpid_of (lwp)); | |
7984d532 | 3926 | return 0; |
d50171e4 PA |
3927 | } |
3928 | ||
3929 | if (lwp->status_pending_p) | |
3930 | { | |
3931 | if (debug_threads) | |
3932 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3933 | lwpid_of (lwp)); | |
7984d532 | 3934 | return 0; |
d50171e4 PA |
3935 | } |
3936 | ||
7984d532 PA |
3937 | gdb_assert (lwp->suspended >= 0); |
3938 | ||
d50171e4 PA |
3939 | if (lwp->suspended) |
3940 | { | |
3941 | if (debug_threads) | |
3942 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3943 | return 0; |
d50171e4 PA |
3944 | } |
3945 | ||
1a981360 PA |
3946 | if (thread->last_resume_kind == resume_stop |
3947 | && lwp->pending_signals_to_report == NULL | |
3948 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3949 | { |
3950 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3951 | last_status.kind check above would catch it, and we wouldn't | |
3952 | reach here. This LWP may have been momentarily paused by a | |
3953 | stop_all_lwps call while handling for example, another LWP's | |
3954 | step-over. In that case, the pending expected SIGSTOP signal | |
3955 | that was queued at vCont;t handling time will have already | |
3956 | been consumed by wait_for_sigstop, and so we need to requeue | |
3957 | another one here. Note that if the LWP already has a SIGSTOP | |
3958 | pending, this is a no-op. */ | |
3959 | ||
3960 | if (debug_threads) | |
3961 | fprintf (stderr, | |
3962 | "Client wants LWP %ld to stop. " | |
3963 | "Making sure it has a SIGSTOP pending\n", | |
3964 | lwpid_of (lwp)); | |
3965 | ||
3966 | send_sigstop (lwp); | |
3967 | } | |
3968 | ||
8336d594 | 3969 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3970 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3971 | return 0; |
3972 | } | |
3973 | ||
3974 | static int | |
3975 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3976 | { | |
3977 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3978 | ||
3979 | if (lwp == except) | |
3980 | return 0; | |
3981 | ||
3982 | lwp->suspended--; | |
3983 | gdb_assert (lwp->suspended >= 0); | |
3984 | ||
3985 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3986 | } |
3987 | ||
3988 | /* When we finish a step-over, set threads running again. If there's | |
3989 | another thread that may need a step-over, now's the time to start | |
3990 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3991 | ||
3992 | static void | |
3993 | proceed_all_lwps (void) | |
3994 | { | |
3995 | struct lwp_info *need_step_over; | |
3996 | ||
3997 | /* If there is a thread which would otherwise be resumed, which is | |
3998 | stopped at a breakpoint that needs stepping over, then don't | |
3999 | resume any threads - have it step over the breakpoint with all | |
4000 | other threads stopped, then resume all threads again. */ | |
4001 | ||
4002 | if (supports_breakpoints ()) | |
4003 | { | |
4004 | need_step_over | |
4005 | = (struct lwp_info *) find_inferior (&all_lwps, | |
4006 | need_step_over_p, NULL); | |
4007 | ||
4008 | if (need_step_over != NULL) | |
4009 | { | |
4010 | if (debug_threads) | |
4011 | fprintf (stderr, "proceed_all_lwps: found " | |
4012 | "thread %ld needing a step-over\n", | |
4013 | lwpid_of (need_step_over)); | |
4014 | ||
4015 | start_step_over (need_step_over); | |
4016 | return; | |
4017 | } | |
4018 | } | |
5544ad89 | 4019 | |
d50171e4 PA |
4020 | if (debug_threads) |
4021 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
4022 | ||
7984d532 | 4023 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
4024 | } |
4025 | ||
4026 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4027 | pending statuses, are set to run again, except for EXCEPT, if not | |
4028 | NULL. This undoes a stop_all_lwps call. */ | |
4029 | ||
4030 | static void | |
7984d532 | 4031 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4032 | { |
5544ad89 DJ |
4033 | if (debug_threads) |
4034 | { | |
d50171e4 PA |
4035 | if (except) |
4036 | fprintf (stderr, | |
4037 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 4038 | else |
d50171e4 PA |
4039 | fprintf (stderr, |
4040 | "unstopping all lwps\n"); | |
5544ad89 DJ |
4041 | } |
4042 | ||
7984d532 PA |
4043 | if (unsuspend) |
4044 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
4045 | else | |
4046 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
4047 | } |
4048 | ||
58caa3dc DJ |
4049 | |
4050 | #ifdef HAVE_LINUX_REGSETS | |
4051 | ||
1faeff08 MR |
4052 | #define use_linux_regsets 1 |
4053 | ||
030031ee PA |
4054 | /* Returns true if REGSET has been disabled. */ |
4055 | ||
4056 | static int | |
4057 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4058 | { | |
4059 | return (info->disabled_regsets != NULL | |
4060 | && info->disabled_regsets[regset - info->regsets]); | |
4061 | } | |
4062 | ||
4063 | /* Disable REGSET. */ | |
4064 | ||
4065 | static void | |
4066 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4067 | { | |
4068 | int dr_offset; | |
4069 | ||
4070 | dr_offset = regset - info->regsets; | |
4071 | if (info->disabled_regsets == NULL) | |
4072 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4073 | info->disabled_regsets[dr_offset] = 1; | |
4074 | } | |
4075 | ||
58caa3dc | 4076 | static int |
3aee8918 PA |
4077 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4078 | struct regcache *regcache) | |
58caa3dc DJ |
4079 | { |
4080 | struct regset_info *regset; | |
e9d25b98 | 4081 | int saw_general_regs = 0; |
95954743 | 4082 | int pid; |
1570b33e | 4083 | struct iovec iov; |
58caa3dc | 4084 | |
3aee8918 | 4085 | regset = regsets_info->regsets; |
58caa3dc | 4086 | |
95954743 | 4087 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4088 | while (regset->size >= 0) |
4089 | { | |
1570b33e L |
4090 | void *buf, *data; |
4091 | int nt_type, res; | |
58caa3dc | 4092 | |
030031ee | 4093 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4094 | { |
4095 | regset ++; | |
4096 | continue; | |
4097 | } | |
4098 | ||
bca929d3 | 4099 | buf = xmalloc (regset->size); |
1570b33e L |
4100 | |
4101 | nt_type = regset->nt_type; | |
4102 | if (nt_type) | |
4103 | { | |
4104 | iov.iov_base = buf; | |
4105 | iov.iov_len = regset->size; | |
4106 | data = (void *) &iov; | |
4107 | } | |
4108 | else | |
4109 | data = buf; | |
4110 | ||
dfb64f85 | 4111 | #ifndef __sparc__ |
f15f9948 TJB |
4112 | res = ptrace (regset->get_request, pid, |
4113 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4114 | #else |
1570b33e | 4115 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4116 | #endif |
58caa3dc DJ |
4117 | if (res < 0) |
4118 | { | |
4119 | if (errno == EIO) | |
4120 | { | |
52fa2412 | 4121 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4122 | this process mode. */ |
030031ee | 4123 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4124 | free (buf); |
52fa2412 | 4125 | continue; |
58caa3dc DJ |
4126 | } |
4127 | else | |
4128 | { | |
0d62e5e8 | 4129 | char s[256]; |
95954743 PA |
4130 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4131 | pid); | |
0d62e5e8 | 4132 | perror (s); |
58caa3dc DJ |
4133 | } |
4134 | } | |
e9d25b98 DJ |
4135 | else if (regset->type == GENERAL_REGS) |
4136 | saw_general_regs = 1; | |
442ea881 | 4137 | regset->store_function (regcache, buf); |
58caa3dc | 4138 | regset ++; |
fdeb2a12 | 4139 | free (buf); |
58caa3dc | 4140 | } |
e9d25b98 DJ |
4141 | if (saw_general_regs) |
4142 | return 0; | |
4143 | else | |
4144 | return 1; | |
58caa3dc DJ |
4145 | } |
4146 | ||
4147 | static int | |
3aee8918 PA |
4148 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4149 | struct regcache *regcache) | |
58caa3dc DJ |
4150 | { |
4151 | struct regset_info *regset; | |
e9d25b98 | 4152 | int saw_general_regs = 0; |
95954743 | 4153 | int pid; |
1570b33e | 4154 | struct iovec iov; |
58caa3dc | 4155 | |
3aee8918 | 4156 | regset = regsets_info->regsets; |
58caa3dc | 4157 | |
95954743 | 4158 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4159 | while (regset->size >= 0) |
4160 | { | |
1570b33e L |
4161 | void *buf, *data; |
4162 | int nt_type, res; | |
58caa3dc | 4163 | |
030031ee | 4164 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4165 | { |
4166 | regset ++; | |
4167 | continue; | |
4168 | } | |
4169 | ||
bca929d3 | 4170 | buf = xmalloc (regset->size); |
545587ee DJ |
4171 | |
4172 | /* First fill the buffer with the current register set contents, | |
4173 | in case there are any items in the kernel's regset that are | |
4174 | not in gdbserver's regcache. */ | |
1570b33e L |
4175 | |
4176 | nt_type = regset->nt_type; | |
4177 | if (nt_type) | |
4178 | { | |
4179 | iov.iov_base = buf; | |
4180 | iov.iov_len = regset->size; | |
4181 | data = (void *) &iov; | |
4182 | } | |
4183 | else | |
4184 | data = buf; | |
4185 | ||
dfb64f85 | 4186 | #ifndef __sparc__ |
f15f9948 TJB |
4187 | res = ptrace (regset->get_request, pid, |
4188 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4189 | #else |
689cc2ae | 4190 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4191 | #endif |
545587ee DJ |
4192 | |
4193 | if (res == 0) | |
4194 | { | |
4195 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4196 | regset->fill_function (regcache, buf); |
545587ee DJ |
4197 | |
4198 | /* Only now do we write the register set. */ | |
dfb64f85 | 4199 | #ifndef __sparc__ |
f15f9948 TJB |
4200 | res = ptrace (regset->set_request, pid, |
4201 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4202 | #else |
1570b33e | 4203 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4204 | #endif |
545587ee DJ |
4205 | } |
4206 | ||
58caa3dc DJ |
4207 | if (res < 0) |
4208 | { | |
4209 | if (errno == EIO) | |
4210 | { | |
52fa2412 | 4211 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4212 | this process mode. */ |
030031ee | 4213 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4214 | free (buf); |
52fa2412 | 4215 | continue; |
58caa3dc | 4216 | } |
3221518c UW |
4217 | else if (errno == ESRCH) |
4218 | { | |
1b3f6016 PA |
4219 | /* At this point, ESRCH should mean the process is |
4220 | already gone, in which case we simply ignore attempts | |
4221 | to change its registers. See also the related | |
4222 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4223 | free (buf); |
3221518c UW |
4224 | return 0; |
4225 | } | |
58caa3dc DJ |
4226 | else |
4227 | { | |
ce3a066d | 4228 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4229 | } |
4230 | } | |
e9d25b98 DJ |
4231 | else if (regset->type == GENERAL_REGS) |
4232 | saw_general_regs = 1; | |
58caa3dc | 4233 | regset ++; |
09ec9b38 | 4234 | free (buf); |
58caa3dc | 4235 | } |
e9d25b98 DJ |
4236 | if (saw_general_regs) |
4237 | return 0; | |
4238 | else | |
4239 | return 1; | |
58caa3dc DJ |
4240 | } |
4241 | ||
1faeff08 | 4242 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4243 | |
1faeff08 | 4244 | #define use_linux_regsets 0 |
3aee8918 PA |
4245 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4246 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4247 | |
58caa3dc | 4248 | #endif |
1faeff08 MR |
4249 | |
4250 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4251 | calls or 0 if it has to be transferred individually. */ | |
4252 | ||
4253 | static int | |
3aee8918 | 4254 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4255 | { |
4256 | unsigned char mask = 1 << (regno % 8); | |
4257 | size_t index = regno / 8; | |
4258 | ||
4259 | return (use_linux_regsets | |
3aee8918 PA |
4260 | && (regs_info->regset_bitmap == NULL |
4261 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4262 | } |
4263 | ||
58caa3dc | 4264 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4265 | |
4266 | int | |
3aee8918 | 4267 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4268 | { |
4269 | int addr; | |
4270 | ||
3aee8918 | 4271 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4272 | error ("Invalid register number %d.", regnum); |
4273 | ||
3aee8918 | 4274 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4275 | |
4276 | return addr; | |
4277 | } | |
4278 | ||
4279 | /* Fetch one register. */ | |
4280 | static void | |
3aee8918 PA |
4281 | fetch_register (const struct usrregs_info *usrregs, |
4282 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4283 | { |
4284 | CORE_ADDR regaddr; | |
4285 | int i, size; | |
4286 | char *buf; | |
4287 | int pid; | |
4288 | ||
3aee8918 | 4289 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4290 | return; |
4291 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4292 | return; | |
4293 | ||
3aee8918 | 4294 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4295 | if (regaddr == -1) |
4296 | return; | |
4297 | ||
3aee8918 PA |
4298 | size = ((register_size (regcache->tdesc, regno) |
4299 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4300 | & -sizeof (PTRACE_XFER_TYPE)); |
4301 | buf = alloca (size); | |
4302 | ||
4303 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4304 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4305 | { | |
4306 | errno = 0; | |
4307 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4308 | ptrace (PTRACE_PEEKUSER, pid, | |
4309 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4310 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
56f7af9c | 4311 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, (PTRACE_ARG4_TYPE) 0); |
1faeff08 MR |
4312 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4313 | if (errno != 0) | |
4314 | error ("reading register %d: %s", regno, strerror (errno)); | |
4315 | } | |
4316 | ||
4317 | if (the_low_target.supply_ptrace_register) | |
4318 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4319 | else | |
4320 | supply_register (regcache, regno, buf); | |
4321 | } | |
4322 | ||
4323 | /* Store one register. */ | |
4324 | static void | |
3aee8918 PA |
4325 | store_register (const struct usrregs_info *usrregs, |
4326 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4327 | { |
4328 | CORE_ADDR regaddr; | |
4329 | int i, size; | |
4330 | char *buf; | |
4331 | int pid; | |
4332 | ||
3aee8918 | 4333 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4334 | return; |
4335 | if ((*the_low_target.cannot_store_register) (regno)) | |
4336 | return; | |
4337 | ||
3aee8918 | 4338 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4339 | if (regaddr == -1) |
4340 | return; | |
4341 | ||
3aee8918 PA |
4342 | size = ((register_size (regcache->tdesc, regno) |
4343 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4344 | & -sizeof (PTRACE_XFER_TYPE)); |
4345 | buf = alloca (size); | |
4346 | memset (buf, 0, size); | |
4347 | ||
4348 | if (the_low_target.collect_ptrace_register) | |
4349 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4350 | else | |
4351 | collect_register (regcache, regno, buf); | |
4352 | ||
4353 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4354 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4355 | { | |
4356 | errno = 0; | |
4357 | ptrace (PTRACE_POKEUSER, pid, | |
4358 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4359 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4360 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
4361 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
4362 | if (errno != 0) | |
4363 | { | |
4364 | /* At this point, ESRCH should mean the process is | |
4365 | already gone, in which case we simply ignore attempts | |
4366 | to change its registers. See also the related | |
4367 | comment in linux_resume_one_lwp. */ | |
4368 | if (errno == ESRCH) | |
4369 | return; | |
4370 | ||
4371 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4372 | error ("writing register %d: %s", regno, strerror (errno)); | |
4373 | } | |
4374 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4375 | } | |
4376 | } | |
4377 | ||
4378 | /* Fetch all registers, or just one, from the child process. | |
4379 | If REGNO is -1, do this for all registers, skipping any that are | |
4380 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4381 | unless ALL is non-zero. | |
4382 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4383 | static void | |
3aee8918 PA |
4384 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4385 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4386 | { |
3aee8918 PA |
4387 | struct usrregs_info *usr = regs_info->usrregs; |
4388 | ||
1faeff08 MR |
4389 | if (regno == -1) |
4390 | { | |
3aee8918 PA |
4391 | for (regno = 0; regno < usr->num_regs; regno++) |
4392 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4393 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4394 | } |
4395 | else | |
3aee8918 | 4396 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4397 | } |
4398 | ||
4399 | /* Store our register values back into the inferior. | |
4400 | If REGNO is -1, do this for all registers, skipping any that are | |
4401 | assumed to have been saved by regsets_store_inferior_registers, | |
4402 | unless ALL is non-zero. | |
4403 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4404 | static void | |
3aee8918 PA |
4405 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4406 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4407 | { |
3aee8918 PA |
4408 | struct usrregs_info *usr = regs_info->usrregs; |
4409 | ||
1faeff08 MR |
4410 | if (regno == -1) |
4411 | { | |
3aee8918 PA |
4412 | for (regno = 0; regno < usr->num_regs; regno++) |
4413 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4414 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4415 | } |
4416 | else | |
3aee8918 | 4417 | store_register (usr, regcache, regno); |
1faeff08 MR |
4418 | } |
4419 | ||
4420 | #else /* !HAVE_LINUX_USRREGS */ | |
4421 | ||
3aee8918 PA |
4422 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4423 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4424 | |
58caa3dc | 4425 | #endif |
1faeff08 MR |
4426 | |
4427 | ||
4428 | void | |
4429 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4430 | { | |
4431 | int use_regsets; | |
4432 | int all = 0; | |
3aee8918 | 4433 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4434 | |
4435 | if (regno == -1) | |
4436 | { | |
3aee8918 PA |
4437 | if (the_low_target.fetch_register != NULL |
4438 | && regs_info->usrregs != NULL) | |
4439 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4440 | (*the_low_target.fetch_register) (regcache, regno); |
4441 | ||
3aee8918 PA |
4442 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4443 | if (regs_info->usrregs != NULL) | |
4444 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4445 | } |
4446 | else | |
4447 | { | |
c14dfd32 PA |
4448 | if (the_low_target.fetch_register != NULL |
4449 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4450 | return; | |
4451 | ||
3aee8918 | 4452 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4453 | if (use_regsets) |
3aee8918 PA |
4454 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4455 | regcache); | |
4456 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4457 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4458 | } |
58caa3dc DJ |
4459 | } |
4460 | ||
4461 | void | |
442ea881 | 4462 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4463 | { |
1faeff08 MR |
4464 | int use_regsets; |
4465 | int all = 0; | |
3aee8918 | 4466 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4467 | |
4468 | if (regno == -1) | |
4469 | { | |
3aee8918 PA |
4470 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4471 | regcache); | |
4472 | if (regs_info->usrregs != NULL) | |
4473 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
4474 | } |
4475 | else | |
4476 | { | |
3aee8918 | 4477 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4478 | if (use_regsets) |
3aee8918 PA |
4479 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4480 | regcache); | |
4481 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4482 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4483 | } |
58caa3dc DJ |
4484 | } |
4485 | ||
da6d8c04 | 4486 | |
da6d8c04 DJ |
4487 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4488 | to debugger memory starting at MYADDR. */ | |
4489 | ||
c3e735a6 | 4490 | static int |
f450004a | 4491 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4492 | { |
4934b29e MR |
4493 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
4494 | register PTRACE_XFER_TYPE *buffer; | |
4495 | register CORE_ADDR addr; | |
4496 | register int count; | |
4497 | char filename[64]; | |
da6d8c04 | 4498 | register int i; |
4934b29e | 4499 | int ret; |
fd462a61 | 4500 | int fd; |
fd462a61 DJ |
4501 | |
4502 | /* Try using /proc. Don't bother for one word. */ | |
4503 | if (len >= 3 * sizeof (long)) | |
4504 | { | |
4934b29e MR |
4505 | int bytes; |
4506 | ||
fd462a61 DJ |
4507 | /* We could keep this file open and cache it - possibly one per |
4508 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4509 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4510 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4511 | if (fd == -1) | |
4512 | goto no_proc; | |
4513 | ||
4514 | /* If pread64 is available, use it. It's faster if the kernel | |
4515 | supports it (only one syscall), and it's 64-bit safe even on | |
4516 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4517 | application). */ | |
4518 | #ifdef HAVE_PREAD64 | |
4934b29e | 4519 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4520 | #else |
4934b29e MR |
4521 | bytes = -1; |
4522 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4523 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4524 | #endif |
fd462a61 DJ |
4525 | |
4526 | close (fd); | |
4934b29e MR |
4527 | if (bytes == len) |
4528 | return 0; | |
4529 | ||
4530 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4531 | if (bytes > 0) | |
4532 | { | |
4533 | memaddr += bytes; | |
4534 | myaddr += bytes; | |
4535 | len -= bytes; | |
4536 | } | |
fd462a61 | 4537 | } |
da6d8c04 | 4538 | |
fd462a61 | 4539 | no_proc: |
4934b29e MR |
4540 | /* Round starting address down to longword boundary. */ |
4541 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4542 | /* Round ending address up; get number of longwords that makes. */ | |
4543 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4544 | / sizeof (PTRACE_XFER_TYPE)); | |
4545 | /* Allocate buffer of that many longwords. */ | |
4546 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4547 | ||
da6d8c04 | 4548 | /* Read all the longwords */ |
4934b29e | 4549 | errno = 0; |
da6d8c04 DJ |
4550 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4551 | { | |
14ce3065 DE |
4552 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4553 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4554 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
56f7af9c MS |
4555 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, |
4556 | (PTRACE_ARG4_TYPE) 0); | |
c3e735a6 | 4557 | if (errno) |
4934b29e | 4558 | break; |
da6d8c04 | 4559 | } |
4934b29e | 4560 | ret = errno; |
da6d8c04 DJ |
4561 | |
4562 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4563 | if (i > 0) |
4564 | { | |
4565 | i *= sizeof (PTRACE_XFER_TYPE); | |
4566 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4567 | memcpy (myaddr, | |
4568 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4569 | i < len ? i : len); | |
4570 | } | |
c3e735a6 | 4571 | |
4934b29e | 4572 | return ret; |
da6d8c04 DJ |
4573 | } |
4574 | ||
93ae6fdc PA |
4575 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4576 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4577 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4578 | |
ce3a066d | 4579 | static int |
f450004a | 4580 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4581 | { |
4582 | register int i; | |
4583 | /* Round starting address down to longword boundary. */ | |
4584 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4585 | /* Round ending address up; get number of longwords that makes. */ | |
4586 | register int count | |
493e2a69 MS |
4587 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4588 | / sizeof (PTRACE_XFER_TYPE); | |
4589 | ||
da6d8c04 | 4590 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4591 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4592 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4593 | ||
95954743 | 4594 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4595 | |
f0ae6fc3 PA |
4596 | if (len == 0) |
4597 | { | |
4598 | /* Zero length write always succeeds. */ | |
4599 | return 0; | |
4600 | } | |
4601 | ||
0d62e5e8 DJ |
4602 | if (debug_threads) |
4603 | { | |
58d6951d DJ |
4604 | /* Dump up to four bytes. */ |
4605 | unsigned int val = * (unsigned int *) myaddr; | |
4606 | if (len == 1) | |
4607 | val = val & 0xff; | |
4608 | else if (len == 2) | |
4609 | val = val & 0xffff; | |
4610 | else if (len == 3) | |
4611 | val = val & 0xffffff; | |
4612 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4613 | val, (long)memaddr); | |
0d62e5e8 DJ |
4614 | } |
4615 | ||
da6d8c04 DJ |
4616 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4617 | ||
93ae6fdc | 4618 | errno = 0; |
14ce3065 DE |
4619 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4620 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4621 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
56f7af9c MS |
4622 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, |
4623 | (PTRACE_ARG4_TYPE) 0); | |
93ae6fdc PA |
4624 | if (errno) |
4625 | return errno; | |
da6d8c04 DJ |
4626 | |
4627 | if (count > 1) | |
4628 | { | |
93ae6fdc | 4629 | errno = 0; |
da6d8c04 | 4630 | buffer[count - 1] |
95954743 | 4631 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4632 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4633 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4634 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4635 | * sizeof (PTRACE_XFER_TYPE)), | |
56f7af9c | 4636 | (PTRACE_ARG4_TYPE) 0); |
93ae6fdc PA |
4637 | if (errno) |
4638 | return errno; | |
da6d8c04 DJ |
4639 | } |
4640 | ||
93ae6fdc | 4641 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4642 | |
493e2a69 MS |
4643 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4644 | myaddr, len); | |
da6d8c04 DJ |
4645 | |
4646 | /* Write the entire buffer. */ | |
4647 | ||
4648 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4649 | { | |
4650 | errno = 0; | |
14ce3065 DE |
4651 | ptrace (PTRACE_POKETEXT, pid, |
4652 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4653 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4654 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4655 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4656 | if (errno) |
4657 | return errno; | |
4658 | } | |
4659 | ||
4660 | return 0; | |
4661 | } | |
2f2893d9 | 4662 | |
6076632b | 4663 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4664 | static int linux_supports_tracefork_flag; |
4665 | ||
1e7fc18c PA |
4666 | static void |
4667 | linux_enable_event_reporting (int pid) | |
4668 | { | |
4669 | if (!linux_supports_tracefork_flag) | |
4670 | return; | |
4671 | ||
56f7af9c MS |
4672 | ptrace (PTRACE_SETOPTIONS, pid, (PTRACE_ARG3_TYPE) 0, |
4673 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
1e7fc18c PA |
4674 | } |
4675 | ||
51c2684e | 4676 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4677 | |
51c2684e DJ |
4678 | static int |
4679 | linux_tracefork_grandchild (void *arg) | |
4680 | { | |
4681 | _exit (0); | |
4682 | } | |
4683 | ||
7407e2de AS |
4684 | #define STACK_SIZE 4096 |
4685 | ||
51c2684e DJ |
4686 | static int |
4687 | linux_tracefork_child (void *arg) | |
24a09b5f | 4688 | { |
56f7af9c | 4689 | ptrace (PTRACE_TRACEME, 0, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
24a09b5f | 4690 | kill (getpid (), SIGSTOP); |
e4b7f41c JK |
4691 | |
4692 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4693 | ||
4694 | if (fork () == 0) | |
4695 | linux_tracefork_grandchild (NULL); | |
4696 | ||
4697 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4698 | ||
7407e2de AS |
4699 | #ifdef __ia64__ |
4700 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4701 | CLONE_VM | SIGCHLD, NULL); | |
4702 | #else | |
a1f2ce7d | 4703 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4704 | CLONE_VM | SIGCHLD, NULL); |
4705 | #endif | |
e4b7f41c JK |
4706 | |
4707 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4708 | ||
24a09b5f DJ |
4709 | _exit (0); |
4710 | } | |
4711 | ||
24a09b5f DJ |
4712 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4713 | sure that we can enable the option, and that it had the desired | |
4714 | effect. */ | |
4715 | ||
4716 | static void | |
4717 | linux_test_for_tracefork (void) | |
4718 | { | |
4719 | int child_pid, ret, status; | |
4720 | long second_pid; | |
e4b7f41c | 4721 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4722 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4723 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4724 | |
4725 | linux_supports_tracefork_flag = 0; | |
4726 | ||
e4b7f41c JK |
4727 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4728 | ||
4729 | child_pid = fork (); | |
4730 | if (child_pid == 0) | |
4731 | linux_tracefork_child (NULL); | |
4732 | ||
4733 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4734 | ||
51c2684e | 4735 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4736 | #ifdef __ia64__ |
4737 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4738 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4739 | #else /* !__ia64__ */ |
7407e2de AS |
4740 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4741 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4742 | #endif /* !__ia64__ */ |
4743 | ||
4744 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4745 | ||
24a09b5f | 4746 | if (child_pid == -1) |
51c2684e | 4747 | perror_with_name ("clone"); |
24a09b5f DJ |
4748 | |
4749 | ret = my_waitpid (child_pid, &status, 0); | |
4750 | if (ret == -1) | |
4751 | perror_with_name ("waitpid"); | |
4752 | else if (ret != child_pid) | |
4753 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4754 | if (! WIFSTOPPED (status)) | |
4755 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4756 | ||
56f7af9c | 4757 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, (PTRACE_ARG3_TYPE) 0, |
14ce3065 | 4758 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); |
24a09b5f DJ |
4759 | if (ret != 0) |
4760 | { | |
56f7af9c MS |
4761 | ret = ptrace (PTRACE_KILL, child_pid, (PTRACE_ARG3_TYPE) 0, |
4762 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4763 | if (ret != 0) |
4764 | { | |
4765 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4766 | return; | |
4767 | } | |
4768 | ||
4769 | ret = my_waitpid (child_pid, &status, 0); | |
4770 | if (ret != child_pid) | |
4771 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4772 | else if (!WIFSIGNALED (status)) | |
4773 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4774 | "killed child", status); | |
4775 | ||
4776 | return; | |
4777 | } | |
4778 | ||
56f7af9c MS |
4779 | ret = ptrace (PTRACE_CONT, child_pid, (PTRACE_ARG3_TYPE) 0, |
4780 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4781 | if (ret != 0) |
4782 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4783 | ||
4784 | ret = my_waitpid (child_pid, &status, 0); | |
4785 | ||
4786 | if (ret == child_pid && WIFSTOPPED (status) | |
4787 | && status >> 16 == PTRACE_EVENT_FORK) | |
4788 | { | |
4789 | second_pid = 0; | |
56f7af9c MS |
4790 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, (PTRACE_ARG3_TYPE) 0, |
4791 | &second_pid); | |
24a09b5f DJ |
4792 | if (ret == 0 && second_pid != 0) |
4793 | { | |
4794 | int second_status; | |
4795 | ||
4796 | linux_supports_tracefork_flag = 1; | |
4797 | my_waitpid (second_pid, &second_status, 0); | |
56f7af9c MS |
4798 | ret = ptrace (PTRACE_KILL, second_pid, (PTRACE_ARG3_TYPE) 0, |
4799 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4800 | if (ret != 0) |
4801 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4802 | my_waitpid (second_pid, &status, 0); | |
4803 | } | |
4804 | } | |
4805 | else | |
4806 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4807 | "(%d, status 0x%x)", ret, status); | |
4808 | ||
4809 | do | |
4810 | { | |
56f7af9c MS |
4811 | ret = ptrace (PTRACE_KILL, child_pid, (PTRACE_ARG3_TYPE) 0, |
4812 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4813 | if (ret != 0) |
4814 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4815 | my_waitpid (child_pid, &status, 0); | |
4816 | } | |
4817 | while (WIFSTOPPED (status)); | |
51c2684e | 4818 | |
e4b7f41c | 4819 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4820 | free (stack); |
e4b7f41c | 4821 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4822 | } |
4823 | ||
4824 | ||
2f2893d9 DJ |
4825 | static void |
4826 | linux_look_up_symbols (void) | |
4827 | { | |
0d62e5e8 | 4828 | #ifdef USE_THREAD_DB |
95954743 PA |
4829 | struct process_info *proc = current_process (); |
4830 | ||
cdbfd419 | 4831 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4832 | return; |
4833 | ||
6076632b DE |
4834 | /* If the kernel supports tracing forks then it also supports tracing |
4835 | clones, and then we don't need to use the magic thread event breakpoint | |
4836 | to learn about threads. */ | |
cdbfd419 | 4837 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4838 | #endif |
4839 | } | |
4840 | ||
e5379b03 | 4841 | static void |
ef57601b | 4842 | linux_request_interrupt (void) |
e5379b03 | 4843 | { |
a1928bad | 4844 | extern unsigned long signal_pid; |
e5379b03 | 4845 | |
95954743 PA |
4846 | if (!ptid_equal (cont_thread, null_ptid) |
4847 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4848 | { |
54a0b537 | 4849 | struct lwp_info *lwp; |
bd99dc85 | 4850 | int lwpid; |
e5379b03 | 4851 | |
54a0b537 | 4852 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4853 | lwpid = lwpid_of (lwp); |
4854 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4855 | } |
4856 | else | |
ef57601b | 4857 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4858 | } |
4859 | ||
aa691b87 RM |
4860 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4861 | to debugger memory starting at MYADDR. */ | |
4862 | ||
4863 | static int | |
f450004a | 4864 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4865 | { |
4866 | char filename[PATH_MAX]; | |
4867 | int fd, n; | |
95954743 | 4868 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4869 | |
6cebaf6e | 4870 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4871 | |
4872 | fd = open (filename, O_RDONLY); | |
4873 | if (fd < 0) | |
4874 | return -1; | |
4875 | ||
4876 | if (offset != (CORE_ADDR) 0 | |
4877 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4878 | n = -1; | |
4879 | else | |
4880 | n = read (fd, myaddr, len); | |
4881 | ||
4882 | close (fd); | |
4883 | ||
4884 | return n; | |
4885 | } | |
4886 | ||
d993e290 PA |
4887 | /* These breakpoint and watchpoint related wrapper functions simply |
4888 | pass on the function call if the target has registered a | |
4889 | corresponding function. */ | |
e013ee27 OF |
4890 | |
4891 | static int | |
d993e290 | 4892 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4893 | { |
d993e290 PA |
4894 | if (the_low_target.insert_point != NULL) |
4895 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4896 | else |
4897 | /* Unsupported (see target.h). */ | |
4898 | return 1; | |
4899 | } | |
4900 | ||
4901 | static int | |
d993e290 | 4902 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4903 | { |
d993e290 PA |
4904 | if (the_low_target.remove_point != NULL) |
4905 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4906 | else |
4907 | /* Unsupported (see target.h). */ | |
4908 | return 1; | |
4909 | } | |
4910 | ||
4911 | static int | |
4912 | linux_stopped_by_watchpoint (void) | |
4913 | { | |
c3adc08c PA |
4914 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4915 | ||
4916 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4917 | } |
4918 | ||
4919 | static CORE_ADDR | |
4920 | linux_stopped_data_address (void) | |
4921 | { | |
c3adc08c PA |
4922 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4923 | ||
4924 | return lwp->stopped_data_address; | |
e013ee27 OF |
4925 | } |
4926 | ||
db0dfaa0 LM |
4927 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
4928 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
4929 | && defined(PT_TEXT_END_ADDR) | |
4930 | ||
4931 | /* This is only used for targets that define PT_TEXT_ADDR, | |
4932 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
4933 | the target has different ways of acquiring this information, like | |
4934 | loadmaps. */ | |
52fb6437 NS |
4935 | |
4936 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4937 | to tell gdb about. */ | |
4938 | ||
4939 | static int | |
4940 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4941 | { | |
52fb6437 | 4942 | unsigned long text, text_end, data; |
bd99dc85 | 4943 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4944 | |
4945 | errno = 0; | |
4946 | ||
56f7af9c MS |
4947 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) PT_TEXT_ADDR, |
4948 | (PTRACE_ARG4_TYPE) 0); | |
4949 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) PT_TEXT_END_ADDR, | |
4950 | (PTRACE_ARG4_TYPE) 0); | |
4951 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) PT_DATA_ADDR, | |
4952 | (PTRACE_ARG4_TYPE) 0); | |
52fb6437 NS |
4953 | |
4954 | if (errno == 0) | |
4955 | { | |
4956 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4957 | used by gdb) are relative to the beginning of the program, |
4958 | with the data segment immediately following the text segment. | |
4959 | However, the actual runtime layout in memory may put the data | |
4960 | somewhere else, so when we send gdb a data base-address, we | |
4961 | use the real data base address and subtract the compile-time | |
4962 | data base-address from it (which is just the length of the | |
4963 | text segment). BSS immediately follows data in both | |
4964 | cases. */ | |
52fb6437 NS |
4965 | *text_p = text; |
4966 | *data_p = data - (text_end - text); | |
1b3f6016 | 4967 | |
52fb6437 NS |
4968 | return 1; |
4969 | } | |
52fb6437 NS |
4970 | return 0; |
4971 | } | |
4972 | #endif | |
4973 | ||
07e059b5 VP |
4974 | static int |
4975 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4976 | unsigned char *readbuf, unsigned const char *writebuf, |
4977 | CORE_ADDR offset, int len) | |
07e059b5 | 4978 | { |
d26e3629 | 4979 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4980 | } |
4981 | ||
d0722149 DE |
4982 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4983 | layout of the inferiors' architecture. */ | |
4984 | ||
4985 | static void | |
a5362b9a | 4986 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4987 | { |
4988 | int done = 0; | |
4989 | ||
4990 | if (the_low_target.siginfo_fixup != NULL) | |
4991 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4992 | ||
4993 | /* If there was no callback, or the callback didn't do anything, | |
4994 | then just do a straight memcpy. */ | |
4995 | if (!done) | |
4996 | { | |
4997 | if (direction == 1) | |
a5362b9a | 4998 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4999 | else |
a5362b9a | 5000 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5001 | } |
5002 | } | |
5003 | ||
4aa995e1 PA |
5004 | static int |
5005 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5006 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5007 | { | |
d0722149 | 5008 | int pid; |
a5362b9a TS |
5009 | siginfo_t siginfo; |
5010 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
5011 | |
5012 | if (current_inferior == NULL) | |
5013 | return -1; | |
5014 | ||
bd99dc85 | 5015 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
5016 | |
5017 | if (debug_threads) | |
d0722149 | 5018 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
5019 | readbuf != NULL ? "Reading" : "Writing", |
5020 | pid); | |
5021 | ||
0adea5f7 | 5022 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5023 | return -1; |
5024 | ||
56f7af9c | 5025 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_ARG3_TYPE) 0, &siginfo) != 0) |
4aa995e1 PA |
5026 | return -1; |
5027 | ||
d0722149 DE |
5028 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5029 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5030 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5031 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5032 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5033 | ||
4aa995e1 PA |
5034 | if (offset + len > sizeof (siginfo)) |
5035 | len = sizeof (siginfo) - offset; | |
5036 | ||
5037 | if (readbuf != NULL) | |
d0722149 | 5038 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5039 | else |
5040 | { | |
d0722149 DE |
5041 | memcpy (inf_siginfo + offset, writebuf, len); |
5042 | ||
5043 | /* Convert back to ptrace layout before flushing it out. */ | |
5044 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5045 | ||
56f7af9c | 5046 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_ARG3_TYPE) 0, &siginfo) != 0) |
4aa995e1 PA |
5047 | return -1; |
5048 | } | |
5049 | ||
5050 | return len; | |
5051 | } | |
5052 | ||
bd99dc85 PA |
5053 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5054 | so we notice when children change state; as the handler for the | |
5055 | sigsuspend in my_waitpid. */ | |
5056 | ||
5057 | static void | |
5058 | sigchld_handler (int signo) | |
5059 | { | |
5060 | int old_errno = errno; | |
5061 | ||
5062 | if (debug_threads) | |
e581f2b4 PA |
5063 | { |
5064 | do | |
5065 | { | |
5066 | /* fprintf is not async-signal-safe, so call write | |
5067 | directly. */ | |
5068 | if (write (2, "sigchld_handler\n", | |
5069 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5070 | break; /* just ignore */ | |
5071 | } while (0); | |
5072 | } | |
bd99dc85 PA |
5073 | |
5074 | if (target_is_async_p ()) | |
5075 | async_file_mark (); /* trigger a linux_wait */ | |
5076 | ||
5077 | errno = old_errno; | |
5078 | } | |
5079 | ||
5080 | static int | |
5081 | linux_supports_non_stop (void) | |
5082 | { | |
5083 | return 1; | |
5084 | } | |
5085 | ||
5086 | static int | |
5087 | linux_async (int enable) | |
5088 | { | |
5089 | int previous = (linux_event_pipe[0] != -1); | |
5090 | ||
8336d594 PA |
5091 | if (debug_threads) |
5092 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
5093 | enable, previous); | |
5094 | ||
bd99dc85 PA |
5095 | if (previous != enable) |
5096 | { | |
5097 | sigset_t mask; | |
5098 | sigemptyset (&mask); | |
5099 | sigaddset (&mask, SIGCHLD); | |
5100 | ||
5101 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5102 | ||
5103 | if (enable) | |
5104 | { | |
5105 | if (pipe (linux_event_pipe) == -1) | |
5106 | fatal ("creating event pipe failed."); | |
5107 | ||
5108 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5109 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5110 | ||
5111 | /* Register the event loop handler. */ | |
5112 | add_file_handler (linux_event_pipe[0], | |
5113 | handle_target_event, NULL); | |
5114 | ||
5115 | /* Always trigger a linux_wait. */ | |
5116 | async_file_mark (); | |
5117 | } | |
5118 | else | |
5119 | { | |
5120 | delete_file_handler (linux_event_pipe[0]); | |
5121 | ||
5122 | close (linux_event_pipe[0]); | |
5123 | close (linux_event_pipe[1]); | |
5124 | linux_event_pipe[0] = -1; | |
5125 | linux_event_pipe[1] = -1; | |
5126 | } | |
5127 | ||
5128 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5129 | } | |
5130 | ||
5131 | return previous; | |
5132 | } | |
5133 | ||
5134 | static int | |
5135 | linux_start_non_stop (int nonstop) | |
5136 | { | |
5137 | /* Register or unregister from event-loop accordingly. */ | |
5138 | linux_async (nonstop); | |
5139 | return 0; | |
5140 | } | |
5141 | ||
cf8fd78b PA |
5142 | static int |
5143 | linux_supports_multi_process (void) | |
5144 | { | |
5145 | return 1; | |
5146 | } | |
5147 | ||
03583c20 UW |
5148 | static int |
5149 | linux_supports_disable_randomization (void) | |
5150 | { | |
5151 | #ifdef HAVE_PERSONALITY | |
5152 | return 1; | |
5153 | #else | |
5154 | return 0; | |
5155 | #endif | |
5156 | } | |
efcbbd14 | 5157 | |
d1feda86 YQ |
5158 | static int |
5159 | linux_supports_agent (void) | |
5160 | { | |
5161 | return 1; | |
5162 | } | |
5163 | ||
c2d6af84 PA |
5164 | static int |
5165 | linux_supports_range_stepping (void) | |
5166 | { | |
5167 | if (*the_low_target.supports_range_stepping == NULL) | |
5168 | return 0; | |
5169 | ||
5170 | return (*the_low_target.supports_range_stepping) (); | |
5171 | } | |
5172 | ||
efcbbd14 UW |
5173 | /* Enumerate spufs IDs for process PID. */ |
5174 | static int | |
5175 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5176 | { | |
5177 | int pos = 0; | |
5178 | int written = 0; | |
5179 | char path[128]; | |
5180 | DIR *dir; | |
5181 | struct dirent *entry; | |
5182 | ||
5183 | sprintf (path, "/proc/%ld/fd", pid); | |
5184 | dir = opendir (path); | |
5185 | if (!dir) | |
5186 | return -1; | |
5187 | ||
5188 | rewinddir (dir); | |
5189 | while ((entry = readdir (dir)) != NULL) | |
5190 | { | |
5191 | struct stat st; | |
5192 | struct statfs stfs; | |
5193 | int fd; | |
5194 | ||
5195 | fd = atoi (entry->d_name); | |
5196 | if (!fd) | |
5197 | continue; | |
5198 | ||
5199 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5200 | if (stat (path, &st) != 0) | |
5201 | continue; | |
5202 | if (!S_ISDIR (st.st_mode)) | |
5203 | continue; | |
5204 | ||
5205 | if (statfs (path, &stfs) != 0) | |
5206 | continue; | |
5207 | if (stfs.f_type != SPUFS_MAGIC) | |
5208 | continue; | |
5209 | ||
5210 | if (pos >= offset && pos + 4 <= offset + len) | |
5211 | { | |
5212 | *(unsigned int *)(buf + pos - offset) = fd; | |
5213 | written += 4; | |
5214 | } | |
5215 | pos += 4; | |
5216 | } | |
5217 | ||
5218 | closedir (dir); | |
5219 | return written; | |
5220 | } | |
5221 | ||
5222 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5223 | object type, using the /proc file system. */ | |
5224 | static int | |
5225 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5226 | unsigned const char *writebuf, | |
5227 | CORE_ADDR offset, int len) | |
5228 | { | |
5229 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5230 | char buf[128]; | |
5231 | int fd = 0; | |
5232 | int ret = 0; | |
5233 | ||
5234 | if (!writebuf && !readbuf) | |
5235 | return -1; | |
5236 | ||
5237 | if (!*annex) | |
5238 | { | |
5239 | if (!readbuf) | |
5240 | return -1; | |
5241 | else | |
5242 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5243 | } | |
5244 | ||
5245 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5246 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5247 | if (fd <= 0) | |
5248 | return -1; | |
5249 | ||
5250 | if (offset != 0 | |
5251 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5252 | { | |
5253 | close (fd); | |
5254 | return 0; | |
5255 | } | |
5256 | ||
5257 | if (writebuf) | |
5258 | ret = write (fd, writebuf, (size_t) len); | |
5259 | else | |
5260 | ret = read (fd, readbuf, (size_t) len); | |
5261 | ||
5262 | close (fd); | |
5263 | return ret; | |
5264 | } | |
5265 | ||
723b724b | 5266 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5267 | struct target_loadseg |
5268 | { | |
5269 | /* Core address to which the segment is mapped. */ | |
5270 | Elf32_Addr addr; | |
5271 | /* VMA recorded in the program header. */ | |
5272 | Elf32_Addr p_vaddr; | |
5273 | /* Size of this segment in memory. */ | |
5274 | Elf32_Word p_memsz; | |
5275 | }; | |
5276 | ||
723b724b | 5277 | # if defined PT_GETDSBT |
78d85199 YQ |
5278 | struct target_loadmap |
5279 | { | |
5280 | /* Protocol version number, must be zero. */ | |
5281 | Elf32_Word version; | |
5282 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5283 | unsigned *dsbt_table; | |
5284 | unsigned dsbt_size, dsbt_index; | |
5285 | /* Number of segments in this map. */ | |
5286 | Elf32_Word nsegs; | |
5287 | /* The actual memory map. */ | |
5288 | struct target_loadseg segs[/*nsegs*/]; | |
5289 | }; | |
723b724b MF |
5290 | # define LINUX_LOADMAP PT_GETDSBT |
5291 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5292 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5293 | # else | |
5294 | struct target_loadmap | |
5295 | { | |
5296 | /* Protocol version number, must be zero. */ | |
5297 | Elf32_Half version; | |
5298 | /* Number of segments in this map. */ | |
5299 | Elf32_Half nsegs; | |
5300 | /* The actual memory map. */ | |
5301 | struct target_loadseg segs[/*nsegs*/]; | |
5302 | }; | |
5303 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5304 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5305 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5306 | # endif | |
78d85199 | 5307 | |
78d85199 YQ |
5308 | static int |
5309 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5310 | unsigned char *myaddr, unsigned int len) | |
5311 | { | |
5312 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5313 | int addr = -1; | |
5314 | struct target_loadmap *data = NULL; | |
5315 | unsigned int actual_length, copy_length; | |
5316 | ||
5317 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5318 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5319 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5320 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5321 | else |
5322 | return -1; | |
5323 | ||
723b724b | 5324 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5325 | return -1; |
5326 | ||
5327 | if (data == NULL) | |
5328 | return -1; | |
5329 | ||
5330 | actual_length = sizeof (struct target_loadmap) | |
5331 | + sizeof (struct target_loadseg) * data->nsegs; | |
5332 | ||
5333 | if (offset < 0 || offset > actual_length) | |
5334 | return -1; | |
5335 | ||
5336 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5337 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5338 | return copy_length; | |
5339 | } | |
723b724b MF |
5340 | #else |
5341 | # define linux_read_loadmap NULL | |
5342 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5343 | |
1570b33e L |
5344 | static void |
5345 | linux_process_qsupported (const char *query) | |
5346 | { | |
5347 | if (the_low_target.process_qsupported != NULL) | |
5348 | the_low_target.process_qsupported (query); | |
5349 | } | |
5350 | ||
219f2f23 PA |
5351 | static int |
5352 | linux_supports_tracepoints (void) | |
5353 | { | |
5354 | if (*the_low_target.supports_tracepoints == NULL) | |
5355 | return 0; | |
5356 | ||
5357 | return (*the_low_target.supports_tracepoints) (); | |
5358 | } | |
5359 | ||
5360 | static CORE_ADDR | |
5361 | linux_read_pc (struct regcache *regcache) | |
5362 | { | |
5363 | if (the_low_target.get_pc == NULL) | |
5364 | return 0; | |
5365 | ||
5366 | return (*the_low_target.get_pc) (regcache); | |
5367 | } | |
5368 | ||
5369 | static void | |
5370 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5371 | { | |
5372 | gdb_assert (the_low_target.set_pc != NULL); | |
5373 | ||
5374 | (*the_low_target.set_pc) (regcache, pc); | |
5375 | } | |
5376 | ||
8336d594 PA |
5377 | static int |
5378 | linux_thread_stopped (struct thread_info *thread) | |
5379 | { | |
5380 | return get_thread_lwp (thread)->stopped; | |
5381 | } | |
5382 | ||
5383 | /* This exposes stop-all-threads functionality to other modules. */ | |
5384 | ||
5385 | static void | |
7984d532 | 5386 | linux_pause_all (int freeze) |
8336d594 | 5387 | { |
7984d532 PA |
5388 | stop_all_lwps (freeze, NULL); |
5389 | } | |
5390 | ||
5391 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5392 | modules. */ | |
5393 | ||
5394 | static void | |
5395 | linux_unpause_all (int unfreeze) | |
5396 | { | |
5397 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5398 | } |
5399 | ||
90d74c30 PA |
5400 | static int |
5401 | linux_prepare_to_access_memory (void) | |
5402 | { | |
5403 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5404 | running LWP. */ | |
5405 | if (non_stop) | |
5406 | linux_pause_all (1); | |
5407 | return 0; | |
5408 | } | |
5409 | ||
5410 | static void | |
0146f85b | 5411 | linux_done_accessing_memory (void) |
90d74c30 PA |
5412 | { |
5413 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5414 | running LWP. */ | |
5415 | if (non_stop) | |
5416 | linux_unpause_all (1); | |
5417 | } | |
5418 | ||
fa593d66 PA |
5419 | static int |
5420 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5421 | CORE_ADDR collector, | |
5422 | CORE_ADDR lockaddr, | |
5423 | ULONGEST orig_size, | |
5424 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5425 | CORE_ADDR *trampoline, |
5426 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5427 | unsigned char *jjump_pad_insn, |
5428 | ULONGEST *jjump_pad_insn_size, | |
5429 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5430 | CORE_ADDR *adjusted_insn_addr_end, |
5431 | char *err) | |
fa593d66 PA |
5432 | { |
5433 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5434 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5435 | jump_entry, trampoline, trampoline_size, |
5436 | jjump_pad_insn, jjump_pad_insn_size, | |
5437 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5438 | err); | |
fa593d66 PA |
5439 | } |
5440 | ||
6a271cae PA |
5441 | static struct emit_ops * |
5442 | linux_emit_ops (void) | |
5443 | { | |
5444 | if (the_low_target.emit_ops != NULL) | |
5445 | return (*the_low_target.emit_ops) (); | |
5446 | else | |
5447 | return NULL; | |
5448 | } | |
5449 | ||
405f8e94 SS |
5450 | static int |
5451 | linux_get_min_fast_tracepoint_insn_len (void) | |
5452 | { | |
5453 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5454 | } | |
5455 | ||
2268b414 JK |
5456 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5457 | ||
5458 | static int | |
5459 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5460 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5461 | { | |
5462 | char filename[PATH_MAX]; | |
5463 | int fd; | |
5464 | const int auxv_size = is_elf64 | |
5465 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5466 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5467 | ||
5468 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5469 | ||
5470 | fd = open (filename, O_RDONLY); | |
5471 | if (fd < 0) | |
5472 | return 1; | |
5473 | ||
5474 | *phdr_memaddr = 0; | |
5475 | *num_phdr = 0; | |
5476 | while (read (fd, buf, auxv_size) == auxv_size | |
5477 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5478 | { | |
5479 | if (is_elf64) | |
5480 | { | |
5481 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5482 | ||
5483 | switch (aux->a_type) | |
5484 | { | |
5485 | case AT_PHDR: | |
5486 | *phdr_memaddr = aux->a_un.a_val; | |
5487 | break; | |
5488 | case AT_PHNUM: | |
5489 | *num_phdr = aux->a_un.a_val; | |
5490 | break; | |
5491 | } | |
5492 | } | |
5493 | else | |
5494 | { | |
5495 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5496 | ||
5497 | switch (aux->a_type) | |
5498 | { | |
5499 | case AT_PHDR: | |
5500 | *phdr_memaddr = aux->a_un.a_val; | |
5501 | break; | |
5502 | case AT_PHNUM: | |
5503 | *num_phdr = aux->a_un.a_val; | |
5504 | break; | |
5505 | } | |
5506 | } | |
5507 | } | |
5508 | ||
5509 | close (fd); | |
5510 | ||
5511 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5512 | { | |
5513 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5514 | "phdr_memaddr = %ld, phdr_num = %d", | |
5515 | (long) *phdr_memaddr, *num_phdr); | |
5516 | return 2; | |
5517 | } | |
5518 | ||
5519 | return 0; | |
5520 | } | |
5521 | ||
5522 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5523 | ||
5524 | static CORE_ADDR | |
5525 | get_dynamic (const int pid, const int is_elf64) | |
5526 | { | |
5527 | CORE_ADDR phdr_memaddr, relocation; | |
5528 | int num_phdr, i; | |
5529 | unsigned char *phdr_buf; | |
5530 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5531 | ||
5532 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5533 | return 0; | |
5534 | ||
5535 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5536 | phdr_buf = alloca (num_phdr * phdr_size); | |
5537 | ||
5538 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5539 | return 0; | |
5540 | ||
5541 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5542 | non-zero for PIE ones. */ | |
5543 | relocation = -1; | |
5544 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5545 | if (is_elf64) | |
5546 | { | |
5547 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5548 | ||
5549 | if (p->p_type == PT_PHDR) | |
5550 | relocation = phdr_memaddr - p->p_vaddr; | |
5551 | } | |
5552 | else | |
5553 | { | |
5554 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5555 | ||
5556 | if (p->p_type == PT_PHDR) | |
5557 | relocation = phdr_memaddr - p->p_vaddr; | |
5558 | } | |
5559 | ||
5560 | if (relocation == -1) | |
5561 | { | |
e237a7e2 JK |
5562 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5563 | any real world executables, including PIE executables, have always | |
5564 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5565 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5566 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5567 | ||
5568 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5569 | ||
5570 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5571 | ||
2268b414 JK |
5572 | return 0; |
5573 | } | |
5574 | ||
5575 | for (i = 0; i < num_phdr; i++) | |
5576 | { | |
5577 | if (is_elf64) | |
5578 | { | |
5579 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5580 | ||
5581 | if (p->p_type == PT_DYNAMIC) | |
5582 | return p->p_vaddr + relocation; | |
5583 | } | |
5584 | else | |
5585 | { | |
5586 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5587 | ||
5588 | if (p->p_type == PT_DYNAMIC) | |
5589 | return p->p_vaddr + relocation; | |
5590 | } | |
5591 | } | |
5592 | ||
5593 | return 0; | |
5594 | } | |
5595 | ||
5596 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5597 | can be 0 if the inferior does not yet have the library list initialized. |
5598 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5599 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5600 | |
5601 | static CORE_ADDR | |
5602 | get_r_debug (const int pid, const int is_elf64) | |
5603 | { | |
5604 | CORE_ADDR dynamic_memaddr; | |
5605 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5606 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5607 | CORE_ADDR map = -1; |
2268b414 JK |
5608 | |
5609 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5610 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5611 | return map; |
2268b414 JK |
5612 | |
5613 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5614 | { | |
5615 | if (is_elf64) | |
5616 | { | |
5617 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5618 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5619 | union |
5620 | { | |
5621 | Elf64_Xword map; | |
5622 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5623 | } | |
5624 | rld_map; | |
5625 | ||
5626 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5627 | { | |
5628 | if (linux_read_memory (dyn->d_un.d_val, | |
5629 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5630 | return rld_map.map; | |
5631 | else | |
5632 | break; | |
5633 | } | |
75f62ce7 | 5634 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5635 | |
367ba2c2 MR |
5636 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5637 | map = dyn->d_un.d_val; | |
2268b414 JK |
5638 | |
5639 | if (dyn->d_tag == DT_NULL) | |
5640 | break; | |
5641 | } | |
5642 | else | |
5643 | { | |
5644 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5645 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5646 | union |
5647 | { | |
5648 | Elf32_Word map; | |
5649 | unsigned char buf[sizeof (Elf32_Word)]; | |
5650 | } | |
5651 | rld_map; | |
5652 | ||
5653 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5654 | { | |
5655 | if (linux_read_memory (dyn->d_un.d_val, | |
5656 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5657 | return rld_map.map; | |
5658 | else | |
5659 | break; | |
5660 | } | |
75f62ce7 | 5661 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5662 | |
367ba2c2 MR |
5663 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5664 | map = dyn->d_un.d_val; | |
2268b414 JK |
5665 | |
5666 | if (dyn->d_tag == DT_NULL) | |
5667 | break; | |
5668 | } | |
5669 | ||
5670 | dynamic_memaddr += dyn_size; | |
5671 | } | |
5672 | ||
367ba2c2 | 5673 | return map; |
2268b414 JK |
5674 | } |
5675 | ||
5676 | /* Read one pointer from MEMADDR in the inferior. */ | |
5677 | ||
5678 | static int | |
5679 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5680 | { | |
485f1ee4 PA |
5681 | int ret; |
5682 | ||
5683 | /* Go through a union so this works on either big or little endian | |
5684 | hosts, when the inferior's pointer size is smaller than the size | |
5685 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5686 | same of the superior's. */ | |
5687 | union | |
5688 | { | |
5689 | CORE_ADDR core_addr; | |
5690 | unsigned int ui; | |
5691 | unsigned char uc; | |
5692 | } addr; | |
5693 | ||
5694 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5695 | if (ret == 0) | |
5696 | { | |
5697 | if (ptr_size == sizeof (CORE_ADDR)) | |
5698 | *ptr = addr.core_addr; | |
5699 | else if (ptr_size == sizeof (unsigned int)) | |
5700 | *ptr = addr.ui; | |
5701 | else | |
5702 | gdb_assert_not_reached ("unhandled pointer size"); | |
5703 | } | |
5704 | return ret; | |
2268b414 JK |
5705 | } |
5706 | ||
5707 | struct link_map_offsets | |
5708 | { | |
5709 | /* Offset and size of r_debug.r_version. */ | |
5710 | int r_version_offset; | |
5711 | ||
5712 | /* Offset and size of r_debug.r_map. */ | |
5713 | int r_map_offset; | |
5714 | ||
5715 | /* Offset to l_addr field in struct link_map. */ | |
5716 | int l_addr_offset; | |
5717 | ||
5718 | /* Offset to l_name field in struct link_map. */ | |
5719 | int l_name_offset; | |
5720 | ||
5721 | /* Offset to l_ld field in struct link_map. */ | |
5722 | int l_ld_offset; | |
5723 | ||
5724 | /* Offset to l_next field in struct link_map. */ | |
5725 | int l_next_offset; | |
5726 | ||
5727 | /* Offset to l_prev field in struct link_map. */ | |
5728 | int l_prev_offset; | |
5729 | }; | |
5730 | ||
fb723180 | 5731 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5732 | |
5733 | static int | |
5734 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5735 | unsigned const char *writebuf, | |
5736 | CORE_ADDR offset, int len) | |
5737 | { | |
5738 | char *document; | |
5739 | unsigned document_len; | |
5740 | struct process_info_private *const priv = current_process ()->private; | |
5741 | char filename[PATH_MAX]; | |
5742 | int pid, is_elf64; | |
5743 | ||
5744 | static const struct link_map_offsets lmo_32bit_offsets = | |
5745 | { | |
5746 | 0, /* r_version offset. */ | |
5747 | 4, /* r_debug.r_map offset. */ | |
5748 | 0, /* l_addr offset in link_map. */ | |
5749 | 4, /* l_name offset in link_map. */ | |
5750 | 8, /* l_ld offset in link_map. */ | |
5751 | 12, /* l_next offset in link_map. */ | |
5752 | 16 /* l_prev offset in link_map. */ | |
5753 | }; | |
5754 | ||
5755 | static const struct link_map_offsets lmo_64bit_offsets = | |
5756 | { | |
5757 | 0, /* r_version offset. */ | |
5758 | 8, /* r_debug.r_map offset. */ | |
5759 | 0, /* l_addr offset in link_map. */ | |
5760 | 8, /* l_name offset in link_map. */ | |
5761 | 16, /* l_ld offset in link_map. */ | |
5762 | 24, /* l_next offset in link_map. */ | |
5763 | 32 /* l_prev offset in link_map. */ | |
5764 | }; | |
5765 | const struct link_map_offsets *lmo; | |
214d508e | 5766 | unsigned int machine; |
b1fbec62 GB |
5767 | int ptr_size; |
5768 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
5769 | int allocated = 1024; | |
5770 | char *p; | |
5771 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
5772 | int header_done = 0; | |
2268b414 JK |
5773 | |
5774 | if (writebuf != NULL) | |
5775 | return -2; | |
5776 | if (readbuf == NULL) | |
5777 | return -1; | |
5778 | ||
5779 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5780 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
214d508e | 5781 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 5782 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 5783 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 5784 | |
b1fbec62 GB |
5785 | while (annex[0] != '\0') |
5786 | { | |
5787 | const char *sep; | |
5788 | CORE_ADDR *addrp; | |
5789 | int len; | |
2268b414 | 5790 | |
b1fbec62 GB |
5791 | sep = strchr (annex, '='); |
5792 | if (sep == NULL) | |
5793 | break; | |
0c5bf5a9 | 5794 | |
b1fbec62 GB |
5795 | len = sep - annex; |
5796 | if (len == 5 && strncmp (annex, "start", 5) == 0) | |
5797 | addrp = &lm_addr; | |
5798 | else if (len == 4 && strncmp (annex, "prev", 4) == 0) | |
5799 | addrp = &lm_prev; | |
5800 | else | |
5801 | { | |
5802 | annex = strchr (sep, ';'); | |
5803 | if (annex == NULL) | |
5804 | break; | |
5805 | annex++; | |
5806 | continue; | |
5807 | } | |
5808 | ||
5809 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 5810 | } |
b1fbec62 GB |
5811 | |
5812 | if (lm_addr == 0) | |
2268b414 | 5813 | { |
b1fbec62 GB |
5814 | int r_version = 0; |
5815 | ||
5816 | if (priv->r_debug == 0) | |
5817 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5818 | ||
5819 | /* We failed to find DT_DEBUG. Such situation will not change | |
5820 | for this inferior - do not retry it. Report it to GDB as | |
5821 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
5822 | if (priv->r_debug == (CORE_ADDR) -1) | |
5823 | return -1; | |
5824 | ||
5825 | if (priv->r_debug != 0) | |
2268b414 | 5826 | { |
b1fbec62 GB |
5827 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
5828 | (unsigned char *) &r_version, | |
5829 | sizeof (r_version)) != 0 | |
5830 | || r_version != 1) | |
5831 | { | |
5832 | warning ("unexpected r_debug version %d", r_version); | |
5833 | } | |
5834 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5835 | &lm_addr, ptr_size) != 0) | |
5836 | { | |
5837 | warning ("unable to read r_map from 0x%lx", | |
5838 | (long) priv->r_debug + lmo->r_map_offset); | |
5839 | } | |
2268b414 | 5840 | } |
b1fbec62 | 5841 | } |
2268b414 | 5842 | |
b1fbec62 GB |
5843 | document = xmalloc (allocated); |
5844 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5845 | p = document + strlen (document); | |
5846 | ||
5847 | while (lm_addr | |
5848 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
5849 | &l_name, ptr_size) == 0 | |
5850 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5851 | &l_addr, ptr_size) == 0 | |
5852 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5853 | &l_ld, ptr_size) == 0 | |
5854 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5855 | &l_prev, ptr_size) == 0 | |
5856 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5857 | &l_next, ptr_size) == 0) | |
5858 | { | |
5859 | unsigned char libname[PATH_MAX]; | |
5860 | ||
5861 | if (lm_prev != l_prev) | |
2268b414 | 5862 | { |
b1fbec62 GB |
5863 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
5864 | (long) lm_prev, (long) l_prev); | |
5865 | break; | |
2268b414 JK |
5866 | } |
5867 | ||
d878444c JK |
5868 | /* Ignore the first entry even if it has valid name as the first entry |
5869 | corresponds to the main executable. The first entry should not be | |
5870 | skipped if the dynamic loader was loaded late by a static executable | |
5871 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
5872 | executable does not have PT_DYNAMIC present and this function already | |
5873 | exited above due to failed get_r_debug. */ | |
5874 | if (lm_prev == 0) | |
2268b414 | 5875 | { |
d878444c JK |
5876 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
5877 | p = p + strlen (p); | |
5878 | } | |
5879 | else | |
5880 | { | |
5881 | /* Not checking for error because reading may stop before | |
5882 | we've got PATH_MAX worth of characters. */ | |
5883 | libname[0] = '\0'; | |
5884 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5885 | libname[sizeof (libname) - 1] = '\0'; | |
5886 | if (libname[0] != '\0') | |
2268b414 | 5887 | { |
d878444c JK |
5888 | /* 6x the size for xml_escape_text below. */ |
5889 | size_t len = 6 * strlen ((char *) libname); | |
5890 | char *name; | |
2268b414 | 5891 | |
d878444c JK |
5892 | if (!header_done) |
5893 | { | |
5894 | /* Terminate `<library-list-svr4'. */ | |
5895 | *p++ = '>'; | |
5896 | header_done = 1; | |
5897 | } | |
2268b414 | 5898 | |
d878444c JK |
5899 | while (allocated < p - document + len + 200) |
5900 | { | |
5901 | /* Expand to guarantee sufficient storage. */ | |
5902 | uintptr_t document_len = p - document; | |
2268b414 | 5903 | |
d878444c JK |
5904 | document = xrealloc (document, 2 * allocated); |
5905 | allocated *= 2; | |
5906 | p = document + document_len; | |
5907 | } | |
5908 | ||
5909 | name = xml_escape_text ((char *) libname); | |
5910 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5911 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5912 | name, (unsigned long) lm_addr, | |
5913 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5914 | free (name); | |
5915 | } | |
0afae3cf | 5916 | } |
b1fbec62 GB |
5917 | |
5918 | lm_prev = lm_addr; | |
5919 | lm_addr = l_next; | |
2268b414 JK |
5920 | } |
5921 | ||
b1fbec62 GB |
5922 | if (!header_done) |
5923 | { | |
5924 | /* Empty list; terminate `<library-list-svr4'. */ | |
5925 | strcpy (p, "/>"); | |
5926 | } | |
5927 | else | |
5928 | strcpy (p, "</library-list-svr4>"); | |
5929 | ||
2268b414 JK |
5930 | document_len = strlen (document); |
5931 | if (offset < document_len) | |
5932 | document_len -= offset; | |
5933 | else | |
5934 | document_len = 0; | |
5935 | if (len > document_len) | |
5936 | len = document_len; | |
5937 | ||
5938 | memcpy (readbuf, document + offset, len); | |
5939 | xfree (document); | |
5940 | ||
5941 | return len; | |
5942 | } | |
5943 | ||
9accd112 MM |
5944 | #ifdef HAVE_LINUX_BTRACE |
5945 | ||
5946 | /* Enable branch tracing. */ | |
5947 | ||
5948 | static struct btrace_target_info * | |
5949 | linux_low_enable_btrace (ptid_t ptid) | |
5950 | { | |
5951 | struct btrace_target_info *tinfo; | |
5952 | ||
5953 | tinfo = linux_enable_btrace (ptid); | |
3aee8918 | 5954 | |
9accd112 | 5955 | if (tinfo != NULL) |
3aee8918 PA |
5956 | { |
5957 | struct thread_info *thread = find_thread_ptid (ptid); | |
5958 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
5959 | ||
5960 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
5961 | } | |
9accd112 MM |
5962 | |
5963 | return tinfo; | |
5964 | } | |
5965 | ||
5966 | /* Read branch trace data as btrace xml document. */ | |
5967 | ||
5968 | static void | |
5969 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, | |
5970 | int type) | |
5971 | { | |
5972 | VEC (btrace_block_s) *btrace; | |
5973 | struct btrace_block *block; | |
5974 | int i; | |
5975 | ||
5976 | btrace = linux_read_btrace (tinfo, type); | |
5977 | ||
5978 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
5979 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
5980 | ||
5981 | for (i = 0; VEC_iterate (btrace_block_s, btrace, i, block); i++) | |
5982 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
5983 | paddress (block->begin), paddress (block->end)); | |
5984 | ||
5985 | buffer_grow_str (buffer, "</btrace>\n"); | |
5986 | ||
5987 | VEC_free (btrace_block_s, btrace); | |
5988 | } | |
5989 | #endif /* HAVE_LINUX_BTRACE */ | |
5990 | ||
ce3a066d DJ |
5991 | static struct target_ops linux_target_ops = { |
5992 | linux_create_inferior, | |
5993 | linux_attach, | |
5994 | linux_kill, | |
6ad8ae5c | 5995 | linux_detach, |
8336d594 | 5996 | linux_mourn, |
444d6139 | 5997 | linux_join, |
ce3a066d DJ |
5998 | linux_thread_alive, |
5999 | linux_resume, | |
6000 | linux_wait, | |
6001 | linux_fetch_registers, | |
6002 | linux_store_registers, | |
90d74c30 | 6003 | linux_prepare_to_access_memory, |
0146f85b | 6004 | linux_done_accessing_memory, |
ce3a066d DJ |
6005 | linux_read_memory, |
6006 | linux_write_memory, | |
2f2893d9 | 6007 | linux_look_up_symbols, |
ef57601b | 6008 | linux_request_interrupt, |
aa691b87 | 6009 | linux_read_auxv, |
d993e290 PA |
6010 | linux_insert_point, |
6011 | linux_remove_point, | |
e013ee27 OF |
6012 | linux_stopped_by_watchpoint, |
6013 | linux_stopped_data_address, | |
db0dfaa0 LM |
6014 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6015 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6016 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6017 | linux_read_offsets, |
dae5f5cf DJ |
6018 | #else |
6019 | NULL, | |
6020 | #endif | |
6021 | #ifdef USE_THREAD_DB | |
6022 | thread_db_get_tls_address, | |
6023 | #else | |
6024 | NULL, | |
52fb6437 | 6025 | #endif |
efcbbd14 | 6026 | linux_qxfer_spu, |
59a016f0 | 6027 | hostio_last_error_from_errno, |
07e059b5 | 6028 | linux_qxfer_osdata, |
4aa995e1 | 6029 | linux_xfer_siginfo, |
bd99dc85 PA |
6030 | linux_supports_non_stop, |
6031 | linux_async, | |
6032 | linux_start_non_stop, | |
cdbfd419 PP |
6033 | linux_supports_multi_process, |
6034 | #ifdef USE_THREAD_DB | |
dc146f7c | 6035 | thread_db_handle_monitor_command, |
cdbfd419 | 6036 | #else |
dc146f7c | 6037 | NULL, |
cdbfd419 | 6038 | #endif |
d26e3629 | 6039 | linux_common_core_of_thread, |
78d85199 | 6040 | linux_read_loadmap, |
219f2f23 PA |
6041 | linux_process_qsupported, |
6042 | linux_supports_tracepoints, | |
6043 | linux_read_pc, | |
8336d594 PA |
6044 | linux_write_pc, |
6045 | linux_thread_stopped, | |
7984d532 | 6046 | NULL, |
711e434b | 6047 | linux_pause_all, |
7984d532 | 6048 | linux_unpause_all, |
fa593d66 PA |
6049 | linux_cancel_breakpoints, |
6050 | linux_stabilize_threads, | |
6a271cae | 6051 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6052 | linux_emit_ops, |
6053 | linux_supports_disable_randomization, | |
405f8e94 | 6054 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6055 | linux_qxfer_libraries_svr4, |
d1feda86 | 6056 | linux_supports_agent, |
9accd112 MM |
6057 | #ifdef HAVE_LINUX_BTRACE |
6058 | linux_supports_btrace, | |
6059 | linux_low_enable_btrace, | |
6060 | linux_disable_btrace, | |
6061 | linux_low_read_btrace, | |
6062 | #else | |
6063 | NULL, | |
6064 | NULL, | |
6065 | NULL, | |
6066 | NULL, | |
9accd112 | 6067 | #endif |
c2d6af84 | 6068 | linux_supports_range_stepping, |
ce3a066d DJ |
6069 | }; |
6070 | ||
0d62e5e8 DJ |
6071 | static void |
6072 | linux_init_signals () | |
6073 | { | |
6074 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6075 | to find what the cancel signal actually is. */ | |
1a981360 | 6076 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6077 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6078 | #endif |
0d62e5e8 DJ |
6079 | } |
6080 | ||
3aee8918 PA |
6081 | #ifdef HAVE_LINUX_REGSETS |
6082 | void | |
6083 | initialize_regsets_info (struct regsets_info *info) | |
6084 | { | |
6085 | for (info->num_regsets = 0; | |
6086 | info->regsets[info->num_regsets].size >= 0; | |
6087 | info->num_regsets++) | |
6088 | ; | |
3aee8918 PA |
6089 | } |
6090 | #endif | |
6091 | ||
da6d8c04 DJ |
6092 | void |
6093 | initialize_low (void) | |
6094 | { | |
bd99dc85 PA |
6095 | struct sigaction sigchld_action; |
6096 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6097 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6098 | set_breakpoint_data (the_low_target.breakpoint, |
6099 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6100 | linux_init_signals (); |
24a09b5f | 6101 | linux_test_for_tracefork (); |
aa7c7447 | 6102 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6103 | |
6104 | sigchld_action.sa_handler = sigchld_handler; | |
6105 | sigemptyset (&sigchld_action.sa_mask); | |
6106 | sigchld_action.sa_flags = SA_RESTART; | |
6107 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6108 | |
6109 | initialize_low_arch (); | |
da6d8c04 | 6110 | } |