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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 | 25 | #include <stdio.h> |
da6d8c04 | 26 | #include <sys/ptrace.h> |
af96c192 | 27 | #include "linux-ptrace.h" |
e3deef73 | 28 | #include "linux-procfs.h" |
da6d8c04 DJ |
29 | #include <signal.h> |
30 | #include <sys/ioctl.h> | |
31 | #include <fcntl.h> | |
d07c63e7 | 32 | #include <string.h> |
0a30fbc4 DJ |
33 | #include <stdlib.h> |
34 | #include <unistd.h> | |
fa6a77dc | 35 | #include <errno.h> |
fd500816 | 36 | #include <sys/syscall.h> |
f9387fc3 | 37 | #include <sched.h> |
07e059b5 VP |
38 | #include <ctype.h> |
39 | #include <pwd.h> | |
40 | #include <sys/types.h> | |
41 | #include <dirent.h> | |
8bdce1ff | 42 | #include "gdb_stat.h" |
efcbbd14 | 43 | #include <sys/vfs.h> |
1570b33e | 44 | #include <sys/uio.h> |
957f3f49 DE |
45 | #ifndef ELFMAG0 |
46 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
47 | then ELFMAG0 will have been defined. If it didn't get included by | |
48 | gdb_proc_service.h then including it will likely introduce a duplicate | |
49 | definition of elf_fpregset_t. */ | |
50 | #include <elf.h> | |
51 | #endif | |
efcbbd14 UW |
52 | |
53 | #ifndef SPUFS_MAGIC | |
54 | #define SPUFS_MAGIC 0x23c9b64e | |
55 | #endif | |
da6d8c04 | 56 | |
03583c20 UW |
57 | #ifdef HAVE_PERSONALITY |
58 | # include <sys/personality.h> | |
59 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
60 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
61 | # endif | |
62 | #endif | |
63 | ||
fd462a61 DJ |
64 | #ifndef O_LARGEFILE |
65 | #define O_LARGEFILE 0 | |
66 | #endif | |
67 | ||
ec8ebe72 DE |
68 | #ifndef W_STOPCODE |
69 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
70 | #endif | |
71 | ||
1a981360 PA |
72 | /* This is the kernel's hard limit. Not to be confused with |
73 | SIGRTMIN. */ | |
74 | #ifndef __SIGRTMIN | |
75 | #define __SIGRTMIN 32 | |
76 | #endif | |
77 | ||
42c81e2a DJ |
78 | #ifdef __UCLIBC__ |
79 | #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) | |
23512c01 MGD |
80 | /* PTRACE_TEXT_ADDR and friends. */ |
81 | #include <asm/ptrace.h> | |
42c81e2a DJ |
82 | #define HAS_NOMMU |
83 | #endif | |
84 | #endif | |
85 | ||
db0dfaa0 LM |
86 | /* Some targets did not define these ptrace constants from the start, |
87 | so gdbserver defines them locally here. In the future, these may | |
88 | be removed after they are added to asm/ptrace.h. */ | |
89 | #if !(defined(PT_TEXT_ADDR) \ | |
90 | || defined(PT_DATA_ADDR) \ | |
91 | || defined(PT_TEXT_END_ADDR)) | |
92 | #if defined(__mcoldfire__) | |
93 | /* These are still undefined in 3.10 kernels. */ | |
94 | #define PT_TEXT_ADDR 49*4 | |
95 | #define PT_DATA_ADDR 50*4 | |
96 | #define PT_TEXT_END_ADDR 51*4 | |
97 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
98 | #elif defined(BFIN) | |
99 | #define PT_TEXT_ADDR 220 | |
100 | #define PT_TEXT_END_ADDR 224 | |
101 | #define PT_DATA_ADDR 228 | |
102 | /* These are still undefined in 3.10 kernels. */ | |
103 | #elif defined(__TMS320C6X__) | |
104 | #define PT_TEXT_ADDR (0x10000*4) | |
105 | #define PT_DATA_ADDR (0x10004*4) | |
106 | #define PT_TEXT_END_ADDR (0x10008*4) | |
107 | #endif | |
108 | #endif | |
109 | ||
9accd112 MM |
110 | #ifdef HAVE_LINUX_BTRACE |
111 | # include "linux-btrace.h" | |
112 | #endif | |
113 | ||
8365dcf5 TJB |
114 | #ifndef HAVE_ELF32_AUXV_T |
115 | /* Copied from glibc's elf.h. */ | |
116 | typedef struct | |
117 | { | |
118 | uint32_t a_type; /* Entry type */ | |
119 | union | |
120 | { | |
121 | uint32_t a_val; /* Integer value */ | |
122 | /* We use to have pointer elements added here. We cannot do that, | |
123 | though, since it does not work when using 32-bit definitions | |
124 | on 64-bit platforms and vice versa. */ | |
125 | } a_un; | |
126 | } Elf32_auxv_t; | |
127 | #endif | |
128 | ||
129 | #ifndef HAVE_ELF64_AUXV_T | |
130 | /* Copied from glibc's elf.h. */ | |
131 | typedef struct | |
132 | { | |
133 | uint64_t a_type; /* Entry type */ | |
134 | union | |
135 | { | |
136 | uint64_t a_val; /* Integer value */ | |
137 | /* We use to have pointer elements added here. We cannot do that, | |
138 | though, since it does not work when using 32-bit definitions | |
139 | on 64-bit platforms and vice versa. */ | |
140 | } a_un; | |
141 | } Elf64_auxv_t; | |
142 | #endif | |
143 | ||
24a09b5f DJ |
144 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
145 | representation of the thread ID. | |
611cb4a5 | 146 | |
54a0b537 | 147 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
148 | the same as the LWP ID. |
149 | ||
150 | ``all_processes'' is keyed by the "overall process ID", which | |
151 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 152 | |
54a0b537 | 153 | struct inferior_list all_lwps; |
0d62e5e8 | 154 | |
05044653 PA |
155 | /* A list of all unknown processes which receive stop signals. Some |
156 | other process will presumably claim each of these as forked | |
157 | children momentarily. */ | |
24a09b5f | 158 | |
05044653 PA |
159 | struct simple_pid_list |
160 | { | |
161 | /* The process ID. */ | |
162 | int pid; | |
163 | ||
164 | /* The status as reported by waitpid. */ | |
165 | int status; | |
166 | ||
167 | /* Next in chain. */ | |
168 | struct simple_pid_list *next; | |
169 | }; | |
170 | struct simple_pid_list *stopped_pids; | |
171 | ||
172 | /* Trivial list manipulation functions to keep track of a list of new | |
173 | stopped processes. */ | |
174 | ||
175 | static void | |
176 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
177 | { | |
178 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
179 | ||
180 | new_pid->pid = pid; | |
181 | new_pid->status = status; | |
182 | new_pid->next = *listp; | |
183 | *listp = new_pid; | |
184 | } | |
185 | ||
186 | static int | |
187 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
188 | { | |
189 | struct simple_pid_list **p; | |
190 | ||
191 | for (p = listp; *p != NULL; p = &(*p)->next) | |
192 | if ((*p)->pid == pid) | |
193 | { | |
194 | struct simple_pid_list *next = (*p)->next; | |
195 | ||
196 | *statusp = (*p)->status; | |
197 | xfree (*p); | |
198 | *p = next; | |
199 | return 1; | |
200 | } | |
201 | return 0; | |
202 | } | |
24a09b5f | 203 | |
bde24c0a PA |
204 | enum stopping_threads_kind |
205 | { | |
206 | /* Not stopping threads presently. */ | |
207 | NOT_STOPPING_THREADS, | |
208 | ||
209 | /* Stopping threads. */ | |
210 | STOPPING_THREADS, | |
211 | ||
212 | /* Stopping and suspending threads. */ | |
213 | STOPPING_AND_SUSPENDING_THREADS | |
214 | }; | |
215 | ||
216 | /* This is set while stop_all_lwps is in effect. */ | |
217 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
218 | |
219 | /* FIXME make into a target method? */ | |
24a09b5f | 220 | int using_threads = 1; |
24a09b5f | 221 | |
fa593d66 PA |
222 | /* True if we're presently stabilizing threads (moving them out of |
223 | jump pads). */ | |
224 | static int stabilizing_threads; | |
225 | ||
2acc282a | 226 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 227 | int step, int signal, siginfo_t *info); |
2bd7c093 | 228 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
229 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
230 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 231 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 232 | static void *add_lwp (ptid_t ptid); |
c35fafde | 233 | static int linux_stopped_by_watchpoint (void); |
95954743 | 234 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 235 | static void proceed_all_lwps (void); |
d50171e4 PA |
236 | static int finish_step_over (struct lwp_info *lwp); |
237 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
238 | static int kill_lwp (unsigned long lwpid, int signo); | |
1e7fc18c | 239 | static void linux_enable_event_reporting (int pid); |
d50171e4 PA |
240 | |
241 | /* True if the low target can hardware single-step. Such targets | |
242 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
243 | ||
244 | static int | |
245 | can_hardware_single_step (void) | |
246 | { | |
247 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
248 | } | |
249 | ||
250 | /* True if the low target supports memory breakpoints. If so, we'll | |
251 | have a GET_PC implementation. */ | |
252 | ||
253 | static int | |
254 | supports_breakpoints (void) | |
255 | { | |
256 | return (the_low_target.get_pc != NULL); | |
257 | } | |
0d62e5e8 | 258 | |
fa593d66 PA |
259 | /* Returns true if this target can support fast tracepoints. This |
260 | does not mean that the in-process agent has been loaded in the | |
261 | inferior. */ | |
262 | ||
263 | static int | |
264 | supports_fast_tracepoints (void) | |
265 | { | |
266 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
267 | } | |
268 | ||
c2d6af84 PA |
269 | /* True if LWP is stopped in its stepping range. */ |
270 | ||
271 | static int | |
272 | lwp_in_step_range (struct lwp_info *lwp) | |
273 | { | |
274 | CORE_ADDR pc = lwp->stop_pc; | |
275 | ||
276 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
277 | } | |
278 | ||
0d62e5e8 DJ |
279 | struct pending_signals |
280 | { | |
281 | int signal; | |
32ca6d61 | 282 | siginfo_t info; |
0d62e5e8 DJ |
283 | struct pending_signals *prev; |
284 | }; | |
611cb4a5 | 285 | |
bd99dc85 PA |
286 | /* The read/write ends of the pipe registered as waitable file in the |
287 | event loop. */ | |
288 | static int linux_event_pipe[2] = { -1, -1 }; | |
289 | ||
290 | /* True if we're currently in async mode. */ | |
291 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
292 | ||
02fc4de7 | 293 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
294 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
295 | ||
d0722149 DE |
296 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
297 | ||
298 | static int | |
214d508e | 299 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 300 | { |
214d508e L |
301 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
302 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
303 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
304 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
305 | { | |
306 | *machine = header->e_machine; | |
307 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
308 | ||
309 | } | |
310 | *machine = EM_NONE; | |
311 | return -1; | |
d0722149 DE |
312 | } |
313 | ||
314 | /* Return non-zero if FILE is a 64-bit ELF file, | |
315 | zero if the file is not a 64-bit ELF file, | |
316 | and -1 if the file is not accessible or doesn't exist. */ | |
317 | ||
be07f1a2 | 318 | static int |
214d508e | 319 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 320 | { |
957f3f49 | 321 | Elf64_Ehdr header; |
d0722149 DE |
322 | int fd; |
323 | ||
324 | fd = open (file, O_RDONLY); | |
325 | if (fd < 0) | |
326 | return -1; | |
327 | ||
328 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
329 | { | |
330 | close (fd); | |
331 | return 0; | |
332 | } | |
333 | close (fd); | |
334 | ||
214d508e | 335 | return elf_64_header_p (&header, machine); |
d0722149 DE |
336 | } |
337 | ||
be07f1a2 PA |
338 | /* Accepts an integer PID; Returns true if the executable PID is |
339 | running is a 64-bit ELF file.. */ | |
340 | ||
341 | int | |
214d508e | 342 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 343 | { |
d8d2a3ee | 344 | char file[PATH_MAX]; |
be07f1a2 PA |
345 | |
346 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 347 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
348 | } |
349 | ||
bd99dc85 PA |
350 | static void |
351 | delete_lwp (struct lwp_info *lwp) | |
352 | { | |
353 | remove_thread (get_lwp_thread (lwp)); | |
354 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 355 | free (lwp->arch_private); |
bd99dc85 PA |
356 | free (lwp); |
357 | } | |
358 | ||
95954743 PA |
359 | /* Add a process to the common process list, and set its private |
360 | data. */ | |
361 | ||
362 | static struct process_info * | |
363 | linux_add_process (int pid, int attached) | |
364 | { | |
365 | struct process_info *proc; | |
366 | ||
95954743 PA |
367 | proc = add_process (pid, attached); |
368 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
369 | ||
3aee8918 PA |
370 | /* Set the arch when the first LWP stops. */ |
371 | proc->private->new_inferior = 1; | |
372 | ||
aa5ca48f DE |
373 | if (the_low_target.new_process != NULL) |
374 | proc->private->arch_private = the_low_target.new_process (); | |
375 | ||
95954743 PA |
376 | return proc; |
377 | } | |
378 | ||
07d4f67e DE |
379 | /* Wrapper function for waitpid which handles EINTR, and emulates |
380 | __WALL for systems where that is not available. */ | |
381 | ||
382 | static int | |
383 | my_waitpid (int pid, int *status, int flags) | |
384 | { | |
385 | int ret, out_errno; | |
386 | ||
387 | if (debug_threads) | |
388 | fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags); | |
389 | ||
390 | if (flags & __WALL) | |
391 | { | |
392 | sigset_t block_mask, org_mask, wake_mask; | |
393 | int wnohang; | |
394 | ||
395 | wnohang = (flags & WNOHANG) != 0; | |
396 | flags &= ~(__WALL | __WCLONE); | |
397 | flags |= WNOHANG; | |
398 | ||
399 | /* Block all signals while here. This avoids knowing about | |
400 | LinuxThread's signals. */ | |
401 | sigfillset (&block_mask); | |
402 | sigprocmask (SIG_BLOCK, &block_mask, &org_mask); | |
403 | ||
404 | /* ... except during the sigsuspend below. */ | |
405 | sigemptyset (&wake_mask); | |
406 | ||
407 | while (1) | |
408 | { | |
409 | /* Since all signals are blocked, there's no need to check | |
410 | for EINTR here. */ | |
411 | ret = waitpid (pid, status, flags); | |
412 | out_errno = errno; | |
413 | ||
414 | if (ret == -1 && out_errno != ECHILD) | |
415 | break; | |
416 | else if (ret > 0) | |
417 | break; | |
418 | ||
419 | if (flags & __WCLONE) | |
420 | { | |
421 | /* We've tried both flavors now. If WNOHANG is set, | |
422 | there's nothing else to do, just bail out. */ | |
423 | if (wnohang) | |
424 | break; | |
425 | ||
426 | if (debug_threads) | |
427 | fprintf (stderr, "blocking\n"); | |
428 | ||
429 | /* Block waiting for signals. */ | |
430 | sigsuspend (&wake_mask); | |
431 | } | |
432 | ||
433 | flags ^= __WCLONE; | |
434 | } | |
435 | ||
436 | sigprocmask (SIG_SETMASK, &org_mask, NULL); | |
437 | } | |
438 | else | |
439 | { | |
440 | do | |
441 | ret = waitpid (pid, status, flags); | |
442 | while (ret == -1 && errno == EINTR); | |
443 | out_errno = errno; | |
444 | } | |
445 | ||
446 | if (debug_threads) | |
447 | fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n", | |
448 | pid, flags, status ? *status : -1, ret); | |
449 | ||
450 | errno = out_errno; | |
451 | return ret; | |
452 | } | |
453 | ||
bd99dc85 PA |
454 | /* Handle a GNU/Linux extended wait response. If we see a clone |
455 | event, we need to add the new LWP to our list (and not report the | |
456 | trap to higher layers). */ | |
0d62e5e8 | 457 | |
24a09b5f | 458 | static void |
54a0b537 | 459 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
460 | { |
461 | int event = wstat >> 16; | |
54a0b537 | 462 | struct lwp_info *new_lwp; |
24a09b5f DJ |
463 | |
464 | if (event == PTRACE_EVENT_CLONE) | |
465 | { | |
95954743 | 466 | ptid_t ptid; |
24a09b5f | 467 | unsigned long new_pid; |
05044653 | 468 | int ret, status; |
24a09b5f | 469 | |
56f7af9c MS |
470 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), (PTRACE_ARG3_TYPE) 0, |
471 | &new_pid); | |
24a09b5f DJ |
472 | |
473 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 474 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
475 | { |
476 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
477 | hits the SIGSTOP, but we're already attached. */ | |
478 | ||
97438e3f | 479 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
480 | |
481 | if (ret == -1) | |
482 | perror_with_name ("waiting for new child"); | |
483 | else if (ret != new_pid) | |
484 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 485 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
486 | warning ("wait returned unexpected status 0x%x", status); |
487 | } | |
488 | ||
95954743 PA |
489 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
490 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
491 | add_thread (ptid, new_lwp); | |
24a09b5f | 492 | |
e27d73f6 DE |
493 | /* Either we're going to immediately resume the new thread |
494 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
495 | thinks the thread is currently running, so set this first | |
496 | before calling linux_resume_one_lwp. */ | |
497 | new_lwp->stopped = 1; | |
498 | ||
bde24c0a PA |
499 | /* If we're suspending all threads, leave this one suspended |
500 | too. */ | |
501 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
502 | new_lwp->suspended = 1; | |
503 | ||
da5898ce DJ |
504 | /* Normally we will get the pending SIGSTOP. But in some cases |
505 | we might get another signal delivered to the group first. | |
f21cc1a2 | 506 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
507 | if (WSTOPSIG (status) == SIGSTOP) |
508 | { | |
bde24c0a | 509 | if (stopping_threads != NOT_STOPPING_THREADS) |
d50171e4 PA |
510 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
511 | else | |
e27d73f6 | 512 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 513 | } |
24a09b5f | 514 | else |
da5898ce | 515 | { |
54a0b537 | 516 | new_lwp->stop_expected = 1; |
d50171e4 | 517 | |
bde24c0a | 518 | if (stopping_threads != NOT_STOPPING_THREADS) |
da5898ce | 519 | { |
d50171e4 | 520 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
521 | new_lwp->status_pending_p = 1; |
522 | new_lwp->status_pending = status; | |
da5898ce DJ |
523 | } |
524 | else | |
525 | /* Pass the signal on. This is what GDB does - except | |
526 | shouldn't we really report it instead? */ | |
e27d73f6 | 527 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 528 | } |
24a09b5f DJ |
529 | |
530 | /* Always resume the current thread. If we are stopping | |
531 | threads, it will have a pending SIGSTOP; we may as well | |
532 | collect it now. */ | |
2acc282a | 533 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
534 | } |
535 | } | |
536 | ||
d50171e4 PA |
537 | /* Return the PC as read from the regcache of LWP, without any |
538 | adjustment. */ | |
539 | ||
540 | static CORE_ADDR | |
541 | get_pc (struct lwp_info *lwp) | |
542 | { | |
543 | struct thread_info *saved_inferior; | |
544 | struct regcache *regcache; | |
545 | CORE_ADDR pc; | |
546 | ||
547 | if (the_low_target.get_pc == NULL) | |
548 | return 0; | |
549 | ||
550 | saved_inferior = current_inferior; | |
551 | current_inferior = get_lwp_thread (lwp); | |
552 | ||
553 | regcache = get_thread_regcache (current_inferior, 1); | |
554 | pc = (*the_low_target.get_pc) (regcache); | |
555 | ||
556 | if (debug_threads) | |
557 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
558 | ||
559 | current_inferior = saved_inferior; | |
560 | return pc; | |
561 | } | |
562 | ||
563 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
564 | The SIGTRAP could mean several things. |
565 | ||
566 | On i386, where decr_pc_after_break is non-zero: | |
567 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
568 | we will get only the one SIGTRAP (even if the instruction we | |
569 | stepped over was a breakpoint). The value of $eip will be the | |
570 | next instruction. | |
571 | If we continue the process using PTRACE_CONT, we will get a | |
572 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
573 | the instruction after the breakpoint (i.e. needs to be | |
574 | decremented). If we report the SIGTRAP to GDB, we must also | |
575 | report the undecremented PC. If we cancel the SIGTRAP, we | |
576 | must resume at the decremented PC. | |
577 | ||
578 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
579 | with hardware or kernel single-step: | |
580 | If we single-step over a breakpoint instruction, our PC will | |
581 | point at the following instruction. If we continue and hit a | |
582 | breakpoint instruction, our PC will point at the breakpoint | |
583 | instruction. */ | |
584 | ||
585 | static CORE_ADDR | |
d50171e4 | 586 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 587 | { |
d50171e4 PA |
588 | CORE_ADDR stop_pc; |
589 | ||
590 | if (the_low_target.get_pc == NULL) | |
591 | return 0; | |
0d62e5e8 | 592 | |
d50171e4 PA |
593 | stop_pc = get_pc (lwp); |
594 | ||
bdabb078 PA |
595 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
596 | && !lwp->stepping | |
597 | && !lwp->stopped_by_watchpoint | |
598 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
599 | stop_pc -= the_low_target.decr_pc_after_break; |
600 | ||
601 | if (debug_threads) | |
602 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
603 | ||
604 | return stop_pc; | |
0d62e5e8 | 605 | } |
ce3a066d | 606 | |
0d62e5e8 | 607 | static void * |
95954743 | 608 | add_lwp (ptid_t ptid) |
611cb4a5 | 609 | { |
54a0b537 | 610 | struct lwp_info *lwp; |
0d62e5e8 | 611 | |
54a0b537 PA |
612 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
613 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 614 | |
95954743 | 615 | lwp->head.id = ptid; |
0d62e5e8 | 616 | |
aa5ca48f DE |
617 | if (the_low_target.new_thread != NULL) |
618 | lwp->arch_private = the_low_target.new_thread (); | |
619 | ||
54a0b537 | 620 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 621 | |
54a0b537 | 622 | return lwp; |
0d62e5e8 | 623 | } |
611cb4a5 | 624 | |
da6d8c04 DJ |
625 | /* Start an inferior process and returns its pid. |
626 | ALLARGS is a vector of program-name and args. */ | |
627 | ||
ce3a066d DJ |
628 | static int |
629 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 630 | { |
03583c20 UW |
631 | #ifdef HAVE_PERSONALITY |
632 | int personality_orig = 0, personality_set = 0; | |
633 | #endif | |
a6dbe5df | 634 | struct lwp_info *new_lwp; |
da6d8c04 | 635 | int pid; |
95954743 | 636 | ptid_t ptid; |
da6d8c04 | 637 | |
03583c20 UW |
638 | #ifdef HAVE_PERSONALITY |
639 | if (disable_randomization) | |
640 | { | |
641 | errno = 0; | |
642 | personality_orig = personality (0xffffffff); | |
643 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
644 | { | |
645 | personality_set = 1; | |
646 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
647 | } | |
648 | if (errno != 0 || (personality_set | |
649 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
650 | warning ("Error disabling address space randomization: %s", | |
651 | strerror (errno)); | |
652 | } | |
653 | #endif | |
654 | ||
42c81e2a | 655 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
656 | pid = vfork (); |
657 | #else | |
da6d8c04 | 658 | pid = fork (); |
52fb6437 | 659 | #endif |
da6d8c04 DJ |
660 | if (pid < 0) |
661 | perror_with_name ("fork"); | |
662 | ||
663 | if (pid == 0) | |
664 | { | |
56f7af9c | 665 | ptrace (PTRACE_TRACEME, 0, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
da6d8c04 | 666 | |
1a981360 | 667 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 668 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 669 | #endif |
0d62e5e8 | 670 | |
a9fa9f7d DJ |
671 | setpgid (0, 0); |
672 | ||
e0f9f062 DE |
673 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
674 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
675 | Also, redirect stdin to /dev/null. */ | |
676 | if (remote_connection_is_stdio ()) | |
677 | { | |
678 | close (0); | |
679 | open ("/dev/null", O_RDONLY); | |
680 | dup2 (2, 1); | |
3e52c33d JK |
681 | if (write (2, "stdin/stdout redirected\n", |
682 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
683 | { |
684 | /* Errors ignored. */; | |
685 | } | |
e0f9f062 DE |
686 | } |
687 | ||
2b876972 DJ |
688 | execv (program, allargs); |
689 | if (errno == ENOENT) | |
690 | execvp (program, allargs); | |
da6d8c04 DJ |
691 | |
692 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 693 | strerror (errno)); |
da6d8c04 DJ |
694 | fflush (stderr); |
695 | _exit (0177); | |
696 | } | |
697 | ||
03583c20 UW |
698 | #ifdef HAVE_PERSONALITY |
699 | if (personality_set) | |
700 | { | |
701 | errno = 0; | |
702 | personality (personality_orig); | |
703 | if (errno != 0) | |
704 | warning ("Error restoring address space randomization: %s", | |
705 | strerror (errno)); | |
706 | } | |
707 | #endif | |
708 | ||
95954743 PA |
709 | linux_add_process (pid, 0); |
710 | ||
711 | ptid = ptid_build (pid, pid, 0); | |
712 | new_lwp = add_lwp (ptid); | |
713 | add_thread (ptid, new_lwp); | |
a6dbe5df | 714 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 715 | |
a9fa9f7d | 716 | return pid; |
da6d8c04 DJ |
717 | } |
718 | ||
719 | /* Attach to an inferior process. */ | |
720 | ||
95954743 PA |
721 | static void |
722 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 723 | { |
95954743 | 724 | ptid_t ptid; |
54a0b537 | 725 | struct lwp_info *new_lwp; |
611cb4a5 | 726 | |
56f7af9c MS |
727 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0) |
728 | != 0) | |
da6d8c04 | 729 | { |
87b0bb13 JK |
730 | struct buffer buffer; |
731 | ||
95954743 | 732 | if (!initial) |
2d717e4f DJ |
733 | { |
734 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 735 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
736 | strerror (errno), errno); |
737 | fflush (stderr); | |
738 | return; | |
739 | } | |
5f572dec JK |
740 | |
741 | /* If we fail to attach to a process, report an error. */ | |
87b0bb13 JK |
742 | buffer_init (&buffer); |
743 | linux_ptrace_attach_warnings (lwpid, &buffer); | |
744 | buffer_grow_str0 (&buffer, ""); | |
745 | error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer), | |
746 | lwpid, strerror (errno), errno); | |
da6d8c04 DJ |
747 | } |
748 | ||
95954743 | 749 | if (initial) |
e3deef73 LM |
750 | /* If lwp is the tgid, we handle adding existing threads later. |
751 | Otherwise we just add lwp without bothering about any other | |
752 | threads. */ | |
95954743 PA |
753 | ptid = ptid_build (lwpid, lwpid, 0); |
754 | else | |
755 | { | |
756 | /* Note that extracting the pid from the current inferior is | |
757 | safe, since we're always called in the context of the same | |
758 | process as this new thread. */ | |
759 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
760 | ptid = ptid_build (pid, lwpid, 0); | |
761 | } | |
24a09b5f | 762 | |
95954743 PA |
763 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
764 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 765 | |
a6dbe5df PA |
766 | /* We need to wait for SIGSTOP before being able to make the next |
767 | ptrace call on this LWP. */ | |
768 | new_lwp->must_set_ptrace_flags = 1; | |
769 | ||
644cebc9 | 770 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
771 | { |
772 | if (debug_threads) | |
773 | fprintf (stderr, | |
774 | "Attached to a stopped process\n"); | |
775 | ||
776 | /* The process is definitely stopped. It is in a job control | |
777 | stop, unless the kernel predates the TASK_STOPPED / | |
778 | TASK_TRACED distinction, in which case it might be in a | |
779 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
780 | can kill it, signal it, et cetera. | |
781 | ||
782 | First make sure there is a pending SIGSTOP. Since we are | |
783 | already attached, the process can not transition from stopped | |
784 | to running without a PTRACE_CONT; so we know this signal will | |
785 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
786 | probably already in the queue (unless this kernel is old | |
787 | enough to use TASK_STOPPED for ptrace stops); but since | |
788 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
789 | kill_lwp (lwpid, SIGSTOP); | |
790 | ||
791 | /* Finally, resume the stopped process. This will deliver the | |
792 | SIGSTOP (or a higher priority signal, just like normal | |
793 | PTRACE_ATTACH), which we'll catch later on. */ | |
56f7af9c | 794 | ptrace (PTRACE_CONT, lwpid, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
c14d7ab2 PA |
795 | } |
796 | ||
0d62e5e8 | 797 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
798 | brings it to a halt. |
799 | ||
800 | There are several cases to consider here: | |
801 | ||
802 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 803 | of a new thread that is being created. |
d50171e4 PA |
804 | In this case we should ignore that SIGSTOP and resume the |
805 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 806 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 807 | resume_continue. |
0e21c1ec DE |
808 | |
809 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
810 | to it via attach_inferior. |
811 | In this case we want the process thread to stop. | |
d50171e4 PA |
812 | This is handled by having linux_attach set last_resume_kind == |
813 | resume_stop after we return. | |
e3deef73 LM |
814 | |
815 | If the pid we are attaching to is also the tgid, we attach to and | |
816 | stop all the existing threads. Otherwise, we attach to pid and | |
817 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
818 | |
819 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
820 | existing threads. |
821 | In this case we want the thread to stop. | |
822 | FIXME: This case is currently not properly handled. | |
823 | We should wait for the SIGSTOP but don't. Things work apparently | |
824 | because enough time passes between when we ptrace (ATTACH) and when | |
825 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
826 | |
827 | On the other hand, if we are currently trying to stop all threads, we | |
828 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 829 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
830 | end of the list, and so the new thread has not yet reached |
831 | wait_for_sigstop (but will). */ | |
d50171e4 | 832 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
833 | } |
834 | ||
95954743 PA |
835 | void |
836 | linux_attach_lwp (unsigned long lwpid) | |
837 | { | |
838 | linux_attach_lwp_1 (lwpid, 0); | |
839 | } | |
840 | ||
e3deef73 LM |
841 | /* Attach to PID. If PID is the tgid, attach to it and all |
842 | of its threads. */ | |
843 | ||
c52daf70 | 844 | static int |
a1928bad | 845 | linux_attach (unsigned long pid) |
0d62e5e8 | 846 | { |
e3deef73 LM |
847 | /* Attach to PID. We will check for other threads |
848 | soon. */ | |
95954743 | 849 | linux_attach_lwp_1 (pid, 1); |
95954743 | 850 | linux_add_process (pid, 1); |
0d62e5e8 | 851 | |
bd99dc85 PA |
852 | if (!non_stop) |
853 | { | |
8336d594 PA |
854 | struct thread_info *thread; |
855 | ||
856 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
857 | process. It will be collected by wait shortly. */ | |
858 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
859 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 860 | } |
0d62e5e8 | 861 | |
e3deef73 LM |
862 | if (linux_proc_get_tgid (pid) == pid) |
863 | { | |
864 | DIR *dir; | |
865 | char pathname[128]; | |
866 | ||
867 | sprintf (pathname, "/proc/%ld/task", pid); | |
868 | ||
869 | dir = opendir (pathname); | |
870 | ||
871 | if (!dir) | |
872 | { | |
873 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
874 | fflush (stderr); | |
875 | } | |
876 | else | |
877 | { | |
878 | /* At this point we attached to the tgid. Scan the task for | |
879 | existing threads. */ | |
880 | unsigned long lwp; | |
881 | int new_threads_found; | |
882 | int iterations = 0; | |
883 | struct dirent *dp; | |
884 | ||
885 | while (iterations < 2) | |
886 | { | |
887 | new_threads_found = 0; | |
888 | /* Add all the other threads. While we go through the | |
889 | threads, new threads may be spawned. Cycle through | |
890 | the list of threads until we have done two iterations without | |
891 | finding new threads. */ | |
892 | while ((dp = readdir (dir)) != NULL) | |
893 | { | |
894 | /* Fetch one lwp. */ | |
895 | lwp = strtoul (dp->d_name, NULL, 10); | |
896 | ||
897 | /* Is this a new thread? */ | |
898 | if (lwp | |
899 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
900 | { | |
901 | linux_attach_lwp_1 (lwp, 0); | |
902 | new_threads_found++; | |
903 | ||
904 | if (debug_threads) | |
905 | fprintf (stderr, "\ | |
906 | Found and attached to new lwp %ld\n", lwp); | |
907 | } | |
908 | } | |
909 | ||
910 | if (!new_threads_found) | |
911 | iterations++; | |
912 | else | |
913 | iterations = 0; | |
914 | ||
915 | rewinddir (dir); | |
916 | } | |
917 | closedir (dir); | |
918 | } | |
919 | } | |
920 | ||
95954743 PA |
921 | return 0; |
922 | } | |
923 | ||
924 | struct counter | |
925 | { | |
926 | int pid; | |
927 | int count; | |
928 | }; | |
929 | ||
930 | static int | |
931 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
932 | { | |
933 | struct counter *counter = args; | |
934 | ||
935 | if (ptid_get_pid (entry->id) == counter->pid) | |
936 | { | |
937 | if (++counter->count > 1) | |
938 | return 1; | |
939 | } | |
d61ddec4 | 940 | |
da6d8c04 DJ |
941 | return 0; |
942 | } | |
943 | ||
95954743 PA |
944 | static int |
945 | last_thread_of_process_p (struct thread_info *thread) | |
946 | { | |
947 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
948 | int pid = ptid_get_pid (ptid); | |
949 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 950 | |
95954743 PA |
951 | return (find_inferior (&all_threads, |
952 | second_thread_of_pid_p, &counter) == NULL); | |
953 | } | |
954 | ||
da84f473 PA |
955 | /* Kill LWP. */ |
956 | ||
957 | static void | |
958 | linux_kill_one_lwp (struct lwp_info *lwp) | |
959 | { | |
960 | int pid = lwpid_of (lwp); | |
961 | ||
962 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
963 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
964 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
965 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
966 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
967 | per process, not one for each thread. But since we still support | |
968 | linuxthreads, and we also support debugging programs using raw | |
969 | clone without CLONE_THREAD, we send one for each thread. For | |
970 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
971 | about some old kernels where PTRACE_KILL might work better | |
972 | (dubious if there are any such, but that's why it's paranoia), so | |
973 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
974 | everywhere. */ | |
975 | ||
976 | errno = 0; | |
977 | kill (pid, SIGKILL); | |
978 | if (debug_threads) | |
979 | fprintf (stderr, | |
980 | "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
981 | target_pid_to_str (ptid_of (lwp)), | |
982 | errno ? strerror (errno) : "OK"); | |
983 | ||
984 | errno = 0; | |
56f7af9c | 985 | ptrace (PTRACE_KILL, pid, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
da84f473 PA |
986 | if (debug_threads) |
987 | fprintf (stderr, | |
988 | "LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
989 | target_pid_to_str (ptid_of (lwp)), | |
990 | errno ? strerror (errno) : "OK"); | |
991 | } | |
992 | ||
993 | /* Callback for `find_inferior'. Kills an lwp of a given process, | |
994 | except the leader. */ | |
95954743 PA |
995 | |
996 | static int | |
da84f473 | 997 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 998 | { |
0d62e5e8 | 999 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1000 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 1001 | int wstat; |
95954743 PA |
1002 | int pid = * (int *) args; |
1003 | ||
1004 | if (ptid_get_pid (entry->id) != pid) | |
1005 | return 0; | |
0d62e5e8 | 1006 | |
fd500816 DJ |
1007 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1008 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1009 | the children get a chance to be reaped, it will remain a zombie | |
1010 | forever. */ | |
95954743 | 1011 | |
12b42a12 | 1012 | if (lwpid_of (lwp) == pid) |
95954743 PA |
1013 | { |
1014 | if (debug_threads) | |
1015 | fprintf (stderr, "lkop: is last of process %s\n", | |
1016 | target_pid_to_str (entry->id)); | |
1017 | return 0; | |
1018 | } | |
fd500816 | 1019 | |
0d62e5e8 DJ |
1020 | do |
1021 | { | |
da84f473 | 1022 | linux_kill_one_lwp (lwp); |
0d62e5e8 DJ |
1023 | |
1024 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 1025 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 1026 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
1027 | |
1028 | return 0; | |
da6d8c04 DJ |
1029 | } |
1030 | ||
95954743 PA |
1031 | static int |
1032 | linux_kill (int pid) | |
0d62e5e8 | 1033 | { |
95954743 | 1034 | struct process_info *process; |
54a0b537 | 1035 | struct lwp_info *lwp; |
fd500816 | 1036 | int wstat; |
95954743 | 1037 | int lwpid; |
fd500816 | 1038 | |
95954743 PA |
1039 | process = find_process_pid (pid); |
1040 | if (process == NULL) | |
1041 | return -1; | |
9d606399 | 1042 | |
f9e39928 PA |
1043 | /* If we're killing a running inferior, make sure it is stopped |
1044 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1045 | stop_all_lwps (0, NULL); |
f9e39928 | 1046 | |
da84f473 | 1047 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1048 | |
54a0b537 | 1049 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1050 | thread in the list, so do so now. */ |
95954743 | 1051 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1052 | |
784867a5 | 1053 | if (lwp == NULL) |
fd500816 | 1054 | { |
784867a5 JK |
1055 | if (debug_threads) |
1056 | fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n", | |
1057 | lwpid_of (lwp), pid); | |
1058 | } | |
1059 | else | |
1060 | { | |
1061 | if (debug_threads) | |
1062 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", | |
1063 | lwpid_of (lwp), pid); | |
fd500816 | 1064 | |
784867a5 JK |
1065 | do |
1066 | { | |
da84f473 | 1067 | linux_kill_one_lwp (lwp); |
784867a5 JK |
1068 | |
1069 | /* Make sure it died. The loop is most likely unnecessary. */ | |
1070 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); | |
1071 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
1072 | } | |
2d717e4f | 1073 | |
8336d594 | 1074 | the_target->mourn (process); |
f9e39928 PA |
1075 | |
1076 | /* Since we presently can only stop all lwps of all processes, we | |
1077 | need to unstop lwps of other processes. */ | |
7984d532 | 1078 | unstop_all_lwps (0, NULL); |
95954743 | 1079 | return 0; |
0d62e5e8 DJ |
1080 | } |
1081 | ||
9b224c5e PA |
1082 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1083 | signal the thread last stopped for, which we need to deliver to the | |
1084 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1085 | ||
1086 | static int | |
1087 | get_detach_signal (struct thread_info *thread) | |
1088 | { | |
a493e3e2 | 1089 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1090 | int status; |
1091 | struct lwp_info *lp = get_thread_lwp (thread); | |
1092 | ||
1093 | if (lp->status_pending_p) | |
1094 | status = lp->status_pending; | |
1095 | else | |
1096 | { | |
1097 | /* If the thread had been suspended by gdbserver, and it stopped | |
1098 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1099 | want to deliver that SIGSTOP. */ | |
1100 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1101 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1102 | return 0; |
1103 | ||
1104 | /* Otherwise, we may need to deliver the signal we | |
1105 | intercepted. */ | |
1106 | status = lp->last_status; | |
1107 | } | |
1108 | ||
1109 | if (!WIFSTOPPED (status)) | |
1110 | { | |
1111 | if (debug_threads) | |
1112 | fprintf (stderr, | |
1113 | "GPS: lwp %s hasn't stopped: no pending signal\n", | |
1114 | target_pid_to_str (ptid_of (lp))); | |
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
1119 | if (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1120 | { | |
1121 | if (debug_threads) | |
1122 | fprintf (stderr, | |
1123 | "GPS: lwp %s had stopped with extended " | |
1124 | "status: no pending signal\n", | |
1125 | target_pid_to_str (ptid_of (lp))); | |
1126 | return 0; | |
1127 | } | |
1128 | ||
2ea28649 | 1129 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1130 | |
1131 | if (program_signals_p && !program_signals[signo]) | |
1132 | { | |
1133 | if (debug_threads) | |
1134 | fprintf (stderr, | |
1135 | "GPS: lwp %s had signal %s, but it is in nopass state\n", | |
1136 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1137 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1138 | return 0; |
1139 | } | |
1140 | else if (!program_signals_p | |
1141 | /* If we have no way to know which signals GDB does not | |
1142 | want to have passed to the program, assume | |
1143 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1144 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1145 | { |
1146 | if (debug_threads) | |
1147 | fprintf (stderr, | |
1148 | "GPS: lwp %s had signal %s, " | |
1149 | "but we don't know if we should pass it. Default to not.\n", | |
1150 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1151 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1152 | return 0; |
1153 | } | |
1154 | else | |
1155 | { | |
1156 | if (debug_threads) | |
1157 | fprintf (stderr, | |
1158 | "GPS: lwp %s has pending signal %s: delivering it.\n", | |
1159 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1160 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1161 | |
1162 | return WSTOPSIG (status); | |
1163 | } | |
1164 | } | |
1165 | ||
95954743 PA |
1166 | static int |
1167 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1168 | { |
1169 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1170 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1171 | int pid = * (int *) args; |
9b224c5e | 1172 | int sig; |
95954743 PA |
1173 | |
1174 | if (ptid_get_pid (entry->id) != pid) | |
1175 | return 0; | |
6ad8ae5c | 1176 | |
9b224c5e | 1177 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1178 | if (lwp->stop_expected) |
ae13219e | 1179 | { |
9b224c5e PA |
1180 | if (debug_threads) |
1181 | fprintf (stderr, | |
1182 | "Sending SIGCONT to %s\n", | |
1183 | target_pid_to_str (ptid_of (lwp))); | |
1184 | ||
1185 | kill_lwp (lwpid_of (lwp), SIGCONT); | |
54a0b537 | 1186 | lwp->stop_expected = 0; |
ae13219e DJ |
1187 | } |
1188 | ||
1189 | /* Flush any pending changes to the process's registers. */ | |
3aee8918 | 1190 | regcache_invalidate_thread (get_lwp_thread (lwp)); |
ae13219e | 1191 | |
9b224c5e PA |
1192 | /* Pass on any pending signal for this thread. */ |
1193 | sig = get_detach_signal (thread); | |
1194 | ||
ae13219e | 1195 | /* Finally, let it resume. */ |
82bfbe7e PA |
1196 | if (the_low_target.prepare_to_resume != NULL) |
1197 | the_low_target.prepare_to_resume (lwp); | |
56f7af9c | 1198 | if (ptrace (PTRACE_DETACH, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
f15f9948 | 1199 | (PTRACE_ARG4_TYPE) (long) sig) < 0) |
9b224c5e PA |
1200 | error (_("Can't detach %s: %s"), |
1201 | target_pid_to_str (ptid_of (lwp)), | |
1202 | strerror (errno)); | |
bd99dc85 PA |
1203 | |
1204 | delete_lwp (lwp); | |
95954743 | 1205 | return 0; |
6ad8ae5c DJ |
1206 | } |
1207 | ||
95954743 PA |
1208 | static int |
1209 | linux_detach (int pid) | |
1210 | { | |
1211 | struct process_info *process; | |
1212 | ||
1213 | process = find_process_pid (pid); | |
1214 | if (process == NULL) | |
1215 | return -1; | |
1216 | ||
f9e39928 PA |
1217 | /* Stop all threads before detaching. First, ptrace requires that |
1218 | the thread is stopped to sucessfully detach. Second, thread_db | |
1219 | may need to uninstall thread event breakpoints from memory, which | |
1220 | only works with a stopped process anyway. */ | |
7984d532 | 1221 | stop_all_lwps (0, NULL); |
f9e39928 | 1222 | |
ca5c370d | 1223 | #ifdef USE_THREAD_DB |
8336d594 | 1224 | thread_db_detach (process); |
ca5c370d PA |
1225 | #endif |
1226 | ||
fa593d66 PA |
1227 | /* Stabilize threads (move out of jump pads). */ |
1228 | stabilize_threads (); | |
1229 | ||
95954743 | 1230 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1231 | |
1232 | the_target->mourn (process); | |
f9e39928 PA |
1233 | |
1234 | /* Since we presently can only stop all lwps of all processes, we | |
1235 | need to unstop lwps of other processes. */ | |
7984d532 | 1236 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1237 | return 0; |
1238 | } | |
1239 | ||
1240 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1241 | ||
1242 | static int | |
1243 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1244 | { | |
1245 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1246 | struct process_info *process = proc; | |
1247 | ||
1248 | if (pid_of (lwp) == pid_of (process)) | |
1249 | delete_lwp (lwp); | |
1250 | ||
dd6953e1 | 1251 | return 0; |
6ad8ae5c DJ |
1252 | } |
1253 | ||
8336d594 PA |
1254 | static void |
1255 | linux_mourn (struct process_info *process) | |
1256 | { | |
1257 | struct process_info_private *priv; | |
1258 | ||
1259 | #ifdef USE_THREAD_DB | |
1260 | thread_db_mourn (process); | |
1261 | #endif | |
1262 | ||
f9e39928 PA |
1263 | find_inferior (&all_lwps, delete_lwp_callback, process); |
1264 | ||
8336d594 PA |
1265 | /* Freeing all private data. */ |
1266 | priv = process->private; | |
1267 | free (priv->arch_private); | |
1268 | free (priv); | |
1269 | process->private = NULL; | |
505106cd PA |
1270 | |
1271 | remove_process (process); | |
8336d594 PA |
1272 | } |
1273 | ||
444d6139 | 1274 | static void |
95954743 | 1275 | linux_join (int pid) |
444d6139 | 1276 | { |
444d6139 PA |
1277 | int status, ret; |
1278 | ||
1279 | do { | |
95954743 | 1280 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1281 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1282 | break; | |
1283 | } while (ret != -1 || errno != ECHILD); | |
1284 | } | |
1285 | ||
6ad8ae5c | 1286 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1287 | static int |
95954743 | 1288 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1289 | { |
95954743 PA |
1290 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1291 | ||
1292 | /* We assume we always know if a thread exits. If a whole process | |
1293 | exited but we still haven't been able to report it to GDB, we'll | |
1294 | hold on to the last lwp of the dead process. */ | |
1295 | if (lwp != NULL) | |
1296 | return !lwp->dead; | |
0d62e5e8 DJ |
1297 | else |
1298 | return 0; | |
1299 | } | |
1300 | ||
6bf5e0ba | 1301 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1302 | static int |
d50171e4 | 1303 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1304 | { |
54a0b537 | 1305 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1306 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1307 | struct thread_info *thread; |
95954743 PA |
1308 | |
1309 | /* Check if we're only interested in events from a specific process | |
1310 | or its lwps. */ | |
1311 | if (!ptid_equal (minus_one_ptid, ptid) | |
1312 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
1313 | return 0; | |
0d62e5e8 | 1314 | |
d50171e4 PA |
1315 | thread = get_lwp_thread (lwp); |
1316 | ||
1317 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1318 | report any status pending the LWP may have. */ | |
8336d594 | 1319 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1320 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1321 | return 0; |
0d62e5e8 | 1322 | |
d50171e4 | 1323 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1324 | } |
1325 | ||
95954743 PA |
1326 | static int |
1327 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1328 | { | |
1329 | ptid_t ptid = *(ptid_t *) data; | |
1330 | int lwp; | |
1331 | ||
1332 | if (ptid_get_lwp (ptid) != 0) | |
1333 | lwp = ptid_get_lwp (ptid); | |
1334 | else | |
1335 | lwp = ptid_get_pid (ptid); | |
1336 | ||
1337 | if (ptid_get_lwp (entry->id) == lwp) | |
1338 | return 1; | |
1339 | ||
1340 | return 0; | |
1341 | } | |
1342 | ||
1343 | struct lwp_info * | |
1344 | find_lwp_pid (ptid_t ptid) | |
1345 | { | |
1346 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1347 | } | |
1348 | ||
bd99dc85 | 1349 | static struct lwp_info * |
95954743 | 1350 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1351 | { |
0d62e5e8 | 1352 | int ret; |
95954743 | 1353 | int to_wait_for = -1; |
bd99dc85 | 1354 | struct lwp_info *child = NULL; |
0d62e5e8 | 1355 | |
bd99dc85 | 1356 | if (debug_threads) |
95954743 PA |
1357 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1358 | ||
1359 | if (ptid_equal (ptid, minus_one_ptid)) | |
1360 | to_wait_for = -1; /* any child */ | |
1361 | else | |
1362 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1363 | |
bd99dc85 | 1364 | options |= __WALL; |
0d62e5e8 | 1365 | |
bd99dc85 | 1366 | retry: |
0d62e5e8 | 1367 | |
bd99dc85 PA |
1368 | ret = my_waitpid (to_wait_for, wstatp, options); |
1369 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1370 | return NULL; | |
1371 | else if (ret == -1) | |
1372 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1373 | |
1374 | if (debug_threads | |
1375 | && (!WIFSTOPPED (*wstatp) | |
1376 | || (WSTOPSIG (*wstatp) != 32 | |
1377 | && WSTOPSIG (*wstatp) != 33))) | |
1378 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1379 | ||
95954743 | 1380 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1381 | |
24a09b5f DJ |
1382 | /* If we didn't find a process, one of two things presumably happened: |
1383 | - A process we started and then detached from has exited. Ignore it. | |
1384 | - A process we are controlling has forked and the new child's stop | |
1385 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1386 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f | 1387 | { |
05044653 | 1388 | add_to_pid_list (&stopped_pids, ret, *wstatp); |
24a09b5f DJ |
1389 | goto retry; |
1390 | } | |
bd99dc85 | 1391 | else if (child == NULL) |
24a09b5f DJ |
1392 | goto retry; |
1393 | ||
bd99dc85 | 1394 | child->stopped = 1; |
0d62e5e8 | 1395 | |
bd99dc85 | 1396 | child->last_status = *wstatp; |
32ca6d61 | 1397 | |
3aee8918 | 1398 | if (WIFSTOPPED (*wstatp)) |
d61ddec4 | 1399 | { |
3aee8918 PA |
1400 | struct process_info *proc; |
1401 | ||
1402 | /* Architecture-specific setup after inferior is running. This | |
1403 | needs to happen after we have attached to the inferior and it | |
1404 | is stopped for the first time, but before we access any | |
1405 | inferior registers. */ | |
1406 | proc = find_process_pid (pid_of (child)); | |
1407 | if (proc->private->new_inferior) | |
1408 | { | |
1409 | struct thread_info *saved_inferior; | |
1410 | ||
1411 | saved_inferior = current_inferior; | |
1412 | current_inferior = get_lwp_thread (child); | |
1413 | ||
1414 | the_low_target.arch_setup (); | |
1415 | ||
1416 | current_inferior = saved_inferior; | |
1417 | ||
1418 | proc->private->new_inferior = 0; | |
1419 | } | |
d61ddec4 UW |
1420 | } |
1421 | ||
c3adc08c PA |
1422 | /* Fetch the possibly triggered data watchpoint info and store it in |
1423 | CHILD. | |
1424 | ||
1425 | On some archs, like x86, that use debug registers to set | |
1426 | watchpoints, it's possible that the way to know which watched | |
1427 | address trapped, is to check the register that is used to select | |
1428 | which address to watch. Problem is, between setting the | |
1429 | watchpoint and reading back which data address trapped, the user | |
1430 | may change the set of watchpoints, and, as a consequence, GDB | |
1431 | changes the debug registers in the inferior. To avoid reading | |
1432 | back a stale stopped-data-address when that happens, we cache in | |
1433 | LP the fact that a watchpoint trapped, and the corresponding data | |
1434 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1435 | changes the debug registers meanwhile, we have the cached data we | |
1436 | can rely on. */ | |
1437 | ||
1438 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1439 | { | |
1440 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1441 | { | |
1442 | child->stopped_by_watchpoint = 0; | |
1443 | } | |
1444 | else | |
1445 | { | |
1446 | struct thread_info *saved_inferior; | |
1447 | ||
1448 | saved_inferior = current_inferior; | |
1449 | current_inferior = get_lwp_thread (child); | |
1450 | ||
1451 | child->stopped_by_watchpoint | |
1452 | = the_low_target.stopped_by_watchpoint (); | |
1453 | ||
1454 | if (child->stopped_by_watchpoint) | |
1455 | { | |
1456 | if (the_low_target.stopped_data_address != NULL) | |
1457 | child->stopped_data_address | |
1458 | = the_low_target.stopped_data_address (); | |
1459 | else | |
1460 | child->stopped_data_address = 0; | |
1461 | } | |
1462 | ||
1463 | current_inferior = saved_inferior; | |
1464 | } | |
1465 | } | |
1466 | ||
d50171e4 PA |
1467 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1468 | architecture being defined already (so that CHILD has a valid | |
1469 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1470 | not). */ | |
1471 | if (WIFSTOPPED (*wstatp)) | |
1472 | child->stop_pc = get_stop_pc (child); | |
1473 | ||
0d62e5e8 | 1474 | if (debug_threads |
47c0c975 DE |
1475 | && WIFSTOPPED (*wstatp) |
1476 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1477 | { |
896c7fbb | 1478 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1479 | struct regcache *regcache; |
47c0c975 DE |
1480 | CORE_ADDR pc; |
1481 | ||
d50171e4 | 1482 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1483 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1484 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1485 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1486 | current_inferior = saved_inferior; |
0d62e5e8 | 1487 | } |
bd99dc85 PA |
1488 | |
1489 | return child; | |
0d62e5e8 | 1490 | } |
611cb4a5 | 1491 | |
219f2f23 PA |
1492 | /* This function should only be called if the LWP got a SIGTRAP. |
1493 | ||
1494 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1495 | event was handled, 0 otherwise. */ | |
1496 | ||
1497 | static int | |
1498 | handle_tracepoints (struct lwp_info *lwp) | |
1499 | { | |
1500 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1501 | int tpoint_related_event = 0; | |
1502 | ||
7984d532 PA |
1503 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1504 | uninsert tracepoints. To do this, we temporarily pause all | |
1505 | threads, unpatch away, and then unpause threads. We need to make | |
1506 | sure the unpausing doesn't resume LWP too. */ | |
1507 | lwp->suspended++; | |
1508 | ||
219f2f23 PA |
1509 | /* And we need to be sure that any all-threads-stopping doesn't try |
1510 | to move threads out of the jump pads, as it could deadlock the | |
1511 | inferior (LWP could be in the jump pad, maybe even holding the | |
1512 | lock.) */ | |
1513 | ||
1514 | /* Do any necessary step collect actions. */ | |
1515 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1516 | ||
fa593d66 PA |
1517 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1518 | ||
219f2f23 PA |
1519 | /* See if we just hit a tracepoint and do its main collect |
1520 | actions. */ | |
1521 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1522 | ||
7984d532 PA |
1523 | lwp->suspended--; |
1524 | ||
1525 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1526 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1527 | |
219f2f23 PA |
1528 | if (tpoint_related_event) |
1529 | { | |
1530 | if (debug_threads) | |
1531 | fprintf (stderr, "got a tracepoint event\n"); | |
1532 | return 1; | |
1533 | } | |
1534 | ||
1535 | return 0; | |
1536 | } | |
1537 | ||
fa593d66 PA |
1538 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1539 | fast tracepoint. */ | |
1540 | ||
1541 | static int | |
1542 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1543 | struct fast_tpoint_collect_status *status) | |
1544 | { | |
1545 | CORE_ADDR thread_area; | |
1546 | ||
1547 | if (the_low_target.get_thread_area == NULL) | |
1548 | return 0; | |
1549 | ||
1550 | /* Get the thread area address. This is used to recognize which | |
1551 | thread is which when tracing with the in-process agent library. | |
1552 | We don't read anything from the address, and treat it as opaque; | |
1553 | it's the address itself that we assume is unique per-thread. */ | |
1554 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1555 | return 0; | |
1556 | ||
1557 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1558 | } | |
1559 | ||
1560 | /* The reason we resume in the caller, is because we want to be able | |
1561 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1562 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1563 | refuses to resume. */ | |
1564 | ||
1565 | static int | |
1566 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1567 | { | |
1568 | struct thread_info *saved_inferior; | |
1569 | ||
1570 | saved_inferior = current_inferior; | |
1571 | current_inferior = get_lwp_thread (lwp); | |
1572 | ||
1573 | if ((wstat == NULL | |
1574 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1575 | && supports_fast_tracepoints () | |
58b4daa5 | 1576 | && agent_loaded_p ()) |
fa593d66 PA |
1577 | { |
1578 | struct fast_tpoint_collect_status status; | |
1579 | int r; | |
1580 | ||
1581 | if (debug_threads) | |
1582 | fprintf (stderr, "\ | |
1583 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1584 | lwpid_of (lwp)); | |
1585 | ||
1586 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1587 | ||
1588 | if (wstat == NULL | |
1589 | || (WSTOPSIG (*wstat) != SIGILL | |
1590 | && WSTOPSIG (*wstat) != SIGFPE | |
1591 | && WSTOPSIG (*wstat) != SIGSEGV | |
1592 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1593 | { | |
1594 | lwp->collecting_fast_tracepoint = r; | |
1595 | ||
1596 | if (r != 0) | |
1597 | { | |
1598 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1599 | { | |
1600 | /* Haven't executed the original instruction yet. | |
1601 | Set breakpoint there, and wait till it's hit, | |
1602 | then single-step until exiting the jump pad. */ | |
1603 | lwp->exit_jump_pad_bkpt | |
1604 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1605 | } | |
1606 | ||
1607 | if (debug_threads) | |
1608 | fprintf (stderr, "\ | |
1609 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1610 | lwpid_of (lwp)); | |
0cccb683 | 1611 | current_inferior = saved_inferior; |
fa593d66 PA |
1612 | |
1613 | return 1; | |
1614 | } | |
1615 | } | |
1616 | else | |
1617 | { | |
1618 | /* If we get a synchronous signal while collecting, *and* | |
1619 | while executing the (relocated) original instruction, | |
1620 | reset the PC to point at the tpoint address, before | |
1621 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1622 | report the signal to GDB, and pray for the best. */ | |
1623 | ||
1624 | lwp->collecting_fast_tracepoint = 0; | |
1625 | ||
1626 | if (r != 0 | |
1627 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1628 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1629 | { | |
1630 | siginfo_t info; | |
1631 | struct regcache *regcache; | |
1632 | ||
1633 | /* The si_addr on a few signals references the address | |
1634 | of the faulting instruction. Adjust that as | |
1635 | well. */ | |
1636 | if ((WSTOPSIG (*wstat) == SIGILL | |
1637 | || WSTOPSIG (*wstat) == SIGFPE | |
1638 | || WSTOPSIG (*wstat) == SIGBUS | |
1639 | || WSTOPSIG (*wstat) == SIGSEGV) | |
56f7af9c MS |
1640 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), |
1641 | (PTRACE_ARG3_TYPE) 0, &info) == 0 | |
fa593d66 PA |
1642 | /* Final check just to make sure we don't clobber |
1643 | the siginfo of non-kernel-sent signals. */ | |
1644 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1645 | { | |
1646 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
56f7af9c MS |
1647 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), |
1648 | (PTRACE_ARG3_TYPE) 0, &info); | |
fa593d66 PA |
1649 | } |
1650 | ||
1651 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1652 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1653 | lwp->stop_pc = status.tpoint_addr; | |
1654 | ||
1655 | /* Cancel any fast tracepoint lock this thread was | |
1656 | holding. */ | |
1657 | force_unlock_trace_buffer (); | |
1658 | } | |
1659 | ||
1660 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1661 | { | |
1662 | if (debug_threads) | |
1663 | fprintf (stderr, | |
1664 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1665 | "stopping all threads momentarily.\n"); | |
1666 | ||
1667 | stop_all_lwps (1, lwp); | |
1668 | cancel_breakpoints (); | |
1669 | ||
1670 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1671 | lwp->exit_jump_pad_bkpt = NULL; | |
1672 | ||
1673 | unstop_all_lwps (1, lwp); | |
1674 | ||
1675 | gdb_assert (lwp->suspended >= 0); | |
1676 | } | |
1677 | } | |
1678 | } | |
1679 | ||
1680 | if (debug_threads) | |
1681 | fprintf (stderr, "\ | |
1682 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1683 | lwpid_of (lwp)); | |
0cccb683 YQ |
1684 | |
1685 | current_inferior = saved_inferior; | |
fa593d66 PA |
1686 | return 0; |
1687 | } | |
1688 | ||
1689 | /* Enqueue one signal in the "signals to report later when out of the | |
1690 | jump pad" list. */ | |
1691 | ||
1692 | static void | |
1693 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1694 | { | |
1695 | struct pending_signals *p_sig; | |
1696 | ||
1697 | if (debug_threads) | |
1698 | fprintf (stderr, "\ | |
1699 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1700 | ||
1701 | if (debug_threads) | |
1702 | { | |
1703 | struct pending_signals *sig; | |
1704 | ||
1705 | for (sig = lwp->pending_signals_to_report; | |
1706 | sig != NULL; | |
1707 | sig = sig->prev) | |
1708 | fprintf (stderr, | |
1709 | " Already queued %d\n", | |
1710 | sig->signal); | |
1711 | ||
1712 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1713 | } | |
1714 | ||
1a981360 PA |
1715 | /* Don't enqueue non-RT signals if they are already in the deferred |
1716 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1717 | twice) */ | |
1718 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1719 | { | |
1720 | struct pending_signals *sig; | |
1721 | ||
1722 | for (sig = lwp->pending_signals_to_report; | |
1723 | sig != NULL; | |
1724 | sig = sig->prev) | |
1725 | { | |
1726 | if (sig->signal == WSTOPSIG (*wstat)) | |
1727 | { | |
1728 | if (debug_threads) | |
1729 | fprintf (stderr, | |
1730 | "Not requeuing already queued non-RT signal %d" | |
1731 | " for LWP %ld\n", | |
1732 | sig->signal, | |
1733 | lwpid_of (lwp)); | |
1734 | return; | |
1735 | } | |
1736 | } | |
1737 | } | |
1738 | ||
fa593d66 PA |
1739 | p_sig = xmalloc (sizeof (*p_sig)); |
1740 | p_sig->prev = lwp->pending_signals_to_report; | |
1741 | p_sig->signal = WSTOPSIG (*wstat); | |
1742 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
56f7af9c MS |
1743 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
1744 | &p_sig->info); | |
fa593d66 PA |
1745 | |
1746 | lwp->pending_signals_to_report = p_sig; | |
1747 | } | |
1748 | ||
1749 | /* Dequeue one signal from the "signals to report later when out of | |
1750 | the jump pad" list. */ | |
1751 | ||
1752 | static int | |
1753 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1754 | { | |
1755 | if (lwp->pending_signals_to_report != NULL) | |
1756 | { | |
1757 | struct pending_signals **p_sig; | |
1758 | ||
1759 | p_sig = &lwp->pending_signals_to_report; | |
1760 | while ((*p_sig)->prev != NULL) | |
1761 | p_sig = &(*p_sig)->prev; | |
1762 | ||
1763 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1764 | if ((*p_sig)->info.si_signo != 0) | |
56f7af9c MS |
1765 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
1766 | &(*p_sig)->info); | |
fa593d66 PA |
1767 | free (*p_sig); |
1768 | *p_sig = NULL; | |
1769 | ||
1770 | if (debug_threads) | |
1771 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1772 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1773 | ||
1774 | if (debug_threads) | |
1775 | { | |
1776 | struct pending_signals *sig; | |
1777 | ||
1778 | for (sig = lwp->pending_signals_to_report; | |
1779 | sig != NULL; | |
1780 | sig = sig->prev) | |
1781 | fprintf (stderr, | |
1782 | " Still queued %d\n", | |
1783 | sig->signal); | |
1784 | ||
1785 | fprintf (stderr, " (no more queued signals)\n"); | |
1786 | } | |
1787 | ||
1788 | return 1; | |
1789 | } | |
1790 | ||
1791 | return 0; | |
1792 | } | |
1793 | ||
d50171e4 PA |
1794 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1795 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1796 | will handle the current event, eventually we will resume this LWP, | |
1797 | and this breakpoint will trap again. */ | |
1798 | ||
1799 | static int | |
1800 | cancel_breakpoint (struct lwp_info *lwp) | |
1801 | { | |
1802 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1803 | |
1804 | /* There's nothing to do if we don't support breakpoints. */ | |
1805 | if (!supports_breakpoints ()) | |
1806 | return 0; | |
1807 | ||
d50171e4 PA |
1808 | /* breakpoint_at reads from current inferior. */ |
1809 | saved_inferior = current_inferior; | |
1810 | current_inferior = get_lwp_thread (lwp); | |
1811 | ||
1812 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1813 | { | |
1814 | if (debug_threads) | |
1815 | fprintf (stderr, | |
1816 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1817 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1818 | |
1819 | /* Back up the PC if necessary. */ | |
1820 | if (the_low_target.decr_pc_after_break) | |
1821 | { | |
1822 | struct regcache *regcache | |
fc7238bb | 1823 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1824 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1825 | } | |
1826 | ||
1827 | current_inferior = saved_inferior; | |
1828 | return 1; | |
1829 | } | |
1830 | else | |
1831 | { | |
1832 | if (debug_threads) | |
1833 | fprintf (stderr, | |
1834 | "CB: No breakpoint found at %s for [%s]\n", | |
1835 | paddress (lwp->stop_pc), | |
fc7238bb | 1836 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1837 | } |
1838 | ||
1839 | current_inferior = saved_inferior; | |
1840 | return 0; | |
1841 | } | |
1842 | ||
1843 | /* When the event-loop is doing a step-over, this points at the thread | |
1844 | being stepped. */ | |
1845 | ptid_t step_over_bkpt; | |
1846 | ||
bd99dc85 PA |
1847 | /* Wait for an event from child PID. If PID is -1, wait for any |
1848 | child. Store the stop status through the status pointer WSTAT. | |
1849 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1850 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1851 | the stopped child otherwise. */ | |
1852 | ||
0d62e5e8 | 1853 | static int |
d8301ad1 | 1854 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1855 | { |
d50171e4 | 1856 | struct lwp_info *event_child, *requested_child; |
d8301ad1 | 1857 | ptid_t wait_ptid; |
d50171e4 | 1858 | |
d50171e4 PA |
1859 | event_child = NULL; |
1860 | requested_child = NULL; | |
0d62e5e8 | 1861 | |
95954743 | 1862 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1863 | |
e825046f | 1864 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
0d62e5e8 | 1865 | { |
54a0b537 | 1866 | event_child = (struct lwp_info *) |
d50171e4 | 1867 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1868 | if (debug_threads && event_child) |
bd99dc85 | 1869 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1870 | } |
1871 | else | |
1872 | { | |
95954743 | 1873 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1874 | |
bde24c0a | 1875 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
1876 | && requested_child->status_pending_p |
1877 | && requested_child->collecting_fast_tracepoint) | |
1878 | { | |
1879 | enqueue_one_deferred_signal (requested_child, | |
1880 | &requested_child->status_pending); | |
1881 | requested_child->status_pending_p = 0; | |
1882 | requested_child->status_pending = 0; | |
1883 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1884 | } | |
1885 | ||
1886 | if (requested_child->suspended | |
1887 | && requested_child->status_pending_p) | |
1888 | fatal ("requesting an event out of a suspended child?"); | |
1889 | ||
d50171e4 | 1890 | if (requested_child->status_pending_p) |
bd99dc85 | 1891 | event_child = requested_child; |
0d62e5e8 | 1892 | } |
611cb4a5 | 1893 | |
0d62e5e8 DJ |
1894 | if (event_child != NULL) |
1895 | { | |
bd99dc85 PA |
1896 | if (debug_threads) |
1897 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1898 | lwpid_of (event_child), event_child->status_pending); | |
1899 | *wstat = event_child->status_pending; | |
1900 | event_child->status_pending_p = 0; | |
1901 | event_child->status_pending = 0; | |
1902 | current_inferior = get_lwp_thread (event_child); | |
1903 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1904 | } |
1905 | ||
d8301ad1 JK |
1906 | if (ptid_is_pid (ptid)) |
1907 | { | |
1908 | /* A request to wait for a specific tgid. This is not possible | |
1909 | with waitpid, so instead, we wait for any child, and leave | |
1910 | children we're not interested in right now with a pending | |
1911 | status to report later. */ | |
1912 | wait_ptid = minus_one_ptid; | |
1913 | } | |
1914 | else | |
1915 | wait_ptid = ptid; | |
1916 | ||
0d62e5e8 DJ |
1917 | /* We only enter this loop if no process has a pending wait status. Thus |
1918 | any action taken in response to a wait status inside this loop is | |
1919 | responding as soon as we detect the status, not after any pending | |
1920 | events. */ | |
1921 | while (1) | |
1922 | { | |
d8301ad1 | 1923 | event_child = linux_wait_for_lwp (wait_ptid, wstat, options); |
0d62e5e8 | 1924 | |
bd99dc85 | 1925 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1926 | { |
1927 | if (debug_threads) | |
1928 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1929 | return 0; | |
1930 | } | |
0d62e5e8 DJ |
1931 | |
1932 | if (event_child == NULL) | |
1933 | error ("event from unknown child"); | |
611cb4a5 | 1934 | |
d8301ad1 JK |
1935 | if (ptid_is_pid (ptid) |
1936 | && ptid_get_pid (ptid) != ptid_get_pid (ptid_of (event_child))) | |
1937 | { | |
1938 | if (! WIFSTOPPED (*wstat)) | |
1939 | mark_lwp_dead (event_child, *wstat); | |
1940 | else | |
1941 | { | |
1942 | event_child->status_pending_p = 1; | |
1943 | event_child->status_pending = *wstat; | |
1944 | } | |
1945 | continue; | |
1946 | } | |
1947 | ||
bd99dc85 | 1948 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1949 | |
89be2091 | 1950 | /* Check for thread exit. */ |
bd99dc85 | 1951 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1952 | { |
89be2091 | 1953 | if (debug_threads) |
95954743 | 1954 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1955 | |
1956 | /* If the last thread is exiting, just return. */ | |
95954743 | 1957 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1958 | { |
1959 | if (debug_threads) | |
95954743 PA |
1960 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1961 | lwpid_of (event_child)); | |
bd99dc85 PA |
1962 | return lwpid_of (event_child); |
1963 | } | |
89be2091 | 1964 | |
bd99dc85 PA |
1965 | if (!non_stop) |
1966 | { | |
1967 | current_inferior = (struct thread_info *) all_threads.head; | |
1968 | if (debug_threads) | |
1969 | fprintf (stderr, "Current inferior is now %ld\n", | |
1970 | lwpid_of (get_thread_lwp (current_inferior))); | |
1971 | } | |
1972 | else | |
1973 | { | |
1974 | current_inferior = NULL; | |
1975 | if (debug_threads) | |
1976 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1977 | } | |
89be2091 DJ |
1978 | |
1979 | /* If we were waiting for this particular child to do something... | |
1980 | well, it did something. */ | |
bd99dc85 | 1981 | if (requested_child != NULL) |
d50171e4 PA |
1982 | { |
1983 | int lwpid = lwpid_of (event_child); | |
1984 | ||
1985 | /* Cancel the step-over operation --- the thread that | |
1986 | started it is gone. */ | |
1987 | if (finish_step_over (event_child)) | |
7984d532 | 1988 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1989 | delete_lwp (event_child); |
1990 | return lwpid; | |
1991 | } | |
1992 | ||
1993 | delete_lwp (event_child); | |
89be2091 DJ |
1994 | |
1995 | /* Wait for a more interesting event. */ | |
1996 | continue; | |
1997 | } | |
1998 | ||
a6dbe5df PA |
1999 | if (event_child->must_set_ptrace_flags) |
2000 | { | |
1e7fc18c | 2001 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
2002 | event_child->must_set_ptrace_flags = 0; |
2003 | } | |
2004 | ||
bd99dc85 PA |
2005 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
2006 | && *wstat >> 16 != 0) | |
24a09b5f | 2007 | { |
bd99dc85 | 2008 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
2009 | continue; |
2010 | } | |
2011 | ||
d50171e4 PA |
2012 | if (WIFSTOPPED (*wstat) |
2013 | && WSTOPSIG (*wstat) == SIGSTOP | |
2014 | && event_child->stop_expected) | |
2015 | { | |
2016 | int should_stop; | |
2017 | ||
2018 | if (debug_threads) | |
2019 | fprintf (stderr, "Expected stop.\n"); | |
2020 | event_child->stop_expected = 0; | |
2021 | ||
8336d594 | 2022 | should_stop = (current_inferior->last_resume_kind == resume_stop |
bde24c0a | 2023 | || stopping_threads != NOT_STOPPING_THREADS); |
d50171e4 PA |
2024 | |
2025 | if (!should_stop) | |
2026 | { | |
2027 | linux_resume_one_lwp (event_child, | |
2028 | event_child->stepping, 0, NULL); | |
2029 | continue; | |
2030 | } | |
2031 | } | |
2032 | ||
bd99dc85 | 2033 | return lwpid_of (event_child); |
611cb4a5 | 2034 | } |
0d62e5e8 | 2035 | |
611cb4a5 DJ |
2036 | /* NOTREACHED */ |
2037 | return 0; | |
2038 | } | |
2039 | ||
6bf5e0ba PA |
2040 | /* Count the LWP's that have had events. */ |
2041 | ||
2042 | static int | |
2043 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2044 | { | |
2045 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2046 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2047 | int *count = data; |
2048 | ||
2049 | gdb_assert (count != NULL); | |
2050 | ||
2051 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
2052 | should be reported to GDB. */ | |
8336d594 PA |
2053 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2054 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
2055 | && lp->status_pending_p |
2056 | && WIFSTOPPED (lp->status_pending) | |
2057 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2058 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2059 | (*count)++; | |
2060 | ||
2061 | return 0; | |
2062 | } | |
2063 | ||
2064 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2065 | ||
2066 | static int | |
2067 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2068 | { | |
2069 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2070 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 2071 | |
8336d594 PA |
2072 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2073 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2074 | && lp->status_pending_p) |
2075 | return 1; | |
2076 | else | |
2077 | return 0; | |
2078 | } | |
2079 | ||
2080 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2081 | reported to GDB. */ | |
2082 | ||
2083 | static int | |
2084 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2085 | { | |
2086 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2087 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2088 | int *selector = data; |
2089 | ||
2090 | gdb_assert (selector != NULL); | |
2091 | ||
2092 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
2093 | if (thread->last_resume_kind != resume_stop |
2094 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2095 | && lp->status_pending_p |
2096 | && WIFSTOPPED (lp->status_pending) | |
2097 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2098 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2099 | if ((*selector)-- == 0) | |
2100 | return 1; | |
2101 | ||
2102 | return 0; | |
2103 | } | |
2104 | ||
2105 | static int | |
2106 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
2107 | { | |
2108 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2109 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2110 | struct lwp_info *event_lp = data; |
2111 | ||
2112 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2113 | if (lp == event_lp) | |
2114 | return 0; | |
2115 | ||
2116 | /* If a LWP other than the LWP that we're reporting an event for has | |
2117 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2118 | then just arrange for it to hit it again later. We don't keep | |
2119 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2120 | LWP. We will handle the current event, eventually we will resume | |
2121 | all LWPs, and this one will get its breakpoint trap again. | |
2122 | ||
2123 | If we do not do this, then we run the risk that the user will | |
2124 | delete or disable the breakpoint, but the LWP will have already | |
2125 | tripped on it. */ | |
2126 | ||
8336d594 PA |
2127 | if (thread->last_resume_kind != resume_stop |
2128 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2129 | && lp->status_pending_p |
2130 | && WIFSTOPPED (lp->status_pending) | |
2131 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
2132 | && !lp->stepping |
2133 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
2134 | && cancel_breakpoint (lp)) |
2135 | /* Throw away the SIGTRAP. */ | |
2136 | lp->status_pending_p = 0; | |
2137 | ||
2138 | return 0; | |
2139 | } | |
2140 | ||
7984d532 PA |
2141 | static void |
2142 | linux_cancel_breakpoints (void) | |
2143 | { | |
2144 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
2145 | } | |
2146 | ||
6bf5e0ba PA |
2147 | /* Select one LWP out of those that have events pending. */ |
2148 | ||
2149 | static void | |
2150 | select_event_lwp (struct lwp_info **orig_lp) | |
2151 | { | |
2152 | int num_events = 0; | |
2153 | int random_selector; | |
2154 | struct lwp_info *event_lp; | |
2155 | ||
2156 | /* Give preference to any LWP that is being single-stepped. */ | |
2157 | event_lp | |
2158 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2159 | select_singlestep_lwp_callback, NULL); | |
2160 | if (event_lp != NULL) | |
2161 | { | |
2162 | if (debug_threads) | |
2163 | fprintf (stderr, | |
2164 | "SEL: Select single-step %s\n", | |
2165 | target_pid_to_str (ptid_of (event_lp))); | |
2166 | } | |
2167 | else | |
2168 | { | |
2169 | /* No single-stepping LWP. Select one at random, out of those | |
2170 | which have had SIGTRAP events. */ | |
2171 | ||
2172 | /* First see how many SIGTRAP events we have. */ | |
2173 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
2174 | ||
2175 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2176 | random_selector = (int) | |
2177 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2178 | ||
2179 | if (debug_threads && num_events > 1) | |
2180 | fprintf (stderr, | |
2181 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2182 | num_events, random_selector); | |
2183 | ||
2184 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
2185 | select_event_lwp_callback, | |
2186 | &random_selector); | |
2187 | } | |
2188 | ||
2189 | if (event_lp != NULL) | |
2190 | { | |
2191 | /* Switch the event LWP. */ | |
2192 | *orig_lp = event_lp; | |
2193 | } | |
2194 | } | |
2195 | ||
7984d532 PA |
2196 | /* Decrement the suspend count of an LWP. */ |
2197 | ||
2198 | static int | |
2199 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2200 | { | |
2201 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2202 | ||
2203 | /* Ignore EXCEPT. */ | |
2204 | if (lwp == except) | |
2205 | return 0; | |
2206 | ||
2207 | lwp->suspended--; | |
2208 | ||
2209 | gdb_assert (lwp->suspended >= 0); | |
2210 | return 0; | |
2211 | } | |
2212 | ||
2213 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2214 | NULL. */ | |
2215 | ||
2216 | static void | |
2217 | unsuspend_all_lwps (struct lwp_info *except) | |
2218 | { | |
2219 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
2220 | } | |
2221 | ||
fa593d66 PA |
2222 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2223 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2224 | void *data); | |
2225 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2226 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2227 | struct target_waitstatus *ourstatus, | |
2228 | int target_options); | |
2229 | ||
2230 | /* Stabilize threads (move out of jump pads). | |
2231 | ||
2232 | If a thread is midway collecting a fast tracepoint, we need to | |
2233 | finish the collection and move it out of the jump pad before | |
2234 | reporting the signal. | |
2235 | ||
2236 | This avoids recursion while collecting (when a signal arrives | |
2237 | midway, and the signal handler itself collects), which would trash | |
2238 | the trace buffer. In case the user set a breakpoint in a signal | |
2239 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2240 | Most importantly, there are certain things we can't do safely if | |
2241 | threads are stopped in a jump pad (or in its callee's). For | |
2242 | example: | |
2243 | ||
2244 | - starting a new trace run. A thread still collecting the | |
2245 | previous run, could trash the trace buffer when resumed. The trace | |
2246 | buffer control structures would have been reset but the thread had | |
2247 | no way to tell. The thread could even midway memcpy'ing to the | |
2248 | buffer, which would mean that when resumed, it would clobber the | |
2249 | trace buffer that had been set for a new run. | |
2250 | ||
2251 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2252 | safely. Say you do tstart while a thread is stopped midway while | |
2253 | collecting. When the thread is later resumed, it finishes the | |
2254 | collection, and returns to the jump pad, to execute the original | |
2255 | instruction that was under the tracepoint jump at the time the | |
2256 | older run had been started. If the jump pad had been rewritten | |
2257 | since for something else in the new run, the thread would now | |
2258 | execute the wrong / random instructions. */ | |
2259 | ||
2260 | static void | |
2261 | linux_stabilize_threads (void) | |
2262 | { | |
2263 | struct thread_info *save_inferior; | |
2264 | struct lwp_info *lwp_stuck; | |
2265 | ||
2266 | lwp_stuck | |
2267 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2268 | stuck_in_jump_pad_callback, NULL); | |
2269 | if (lwp_stuck != NULL) | |
2270 | { | |
b4d51a55 PA |
2271 | if (debug_threads) |
2272 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
2273 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2274 | return; |
2275 | } | |
2276 | ||
2277 | save_inferior = current_inferior; | |
2278 | ||
2279 | stabilizing_threads = 1; | |
2280 | ||
2281 | /* Kick 'em all. */ | |
2282 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2283 | ||
2284 | /* Loop until all are stopped out of the jump pads. */ | |
2285 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2286 | { | |
2287 | struct target_waitstatus ourstatus; | |
2288 | struct lwp_info *lwp; | |
fa593d66 PA |
2289 | int wstat; |
2290 | ||
2291 | /* Note that we go through the full wait even loop. While | |
2292 | moving threads out of jump pad, we need to be able to step | |
2293 | over internal breakpoints and such. */ | |
32fcada3 | 2294 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2295 | |
2296 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2297 | { | |
2298 | lwp = get_thread_lwp (current_inferior); | |
2299 | ||
2300 | /* Lock it. */ | |
2301 | lwp->suspended++; | |
2302 | ||
a493e3e2 | 2303 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
fa593d66 PA |
2304 | || current_inferior->last_resume_kind == resume_stop) |
2305 | { | |
2ea28649 | 2306 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2307 | enqueue_one_deferred_signal (lwp, &wstat); |
2308 | } | |
2309 | } | |
2310 | } | |
2311 | ||
2312 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2313 | ||
2314 | stabilizing_threads = 0; | |
2315 | ||
2316 | current_inferior = save_inferior; | |
2317 | ||
b4d51a55 | 2318 | if (debug_threads) |
fa593d66 | 2319 | { |
b4d51a55 PA |
2320 | lwp_stuck |
2321 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2322 | stuck_in_jump_pad_callback, NULL); | |
2323 | if (lwp_stuck != NULL) | |
fa593d66 PA |
2324 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2325 | lwpid_of (lwp_stuck)); | |
2326 | } | |
2327 | } | |
2328 | ||
0d62e5e8 | 2329 | /* Wait for process, returns status. */ |
da6d8c04 | 2330 | |
95954743 PA |
2331 | static ptid_t |
2332 | linux_wait_1 (ptid_t ptid, | |
2333 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2334 | { |
e5f1222d | 2335 | int w; |
fc7238bb | 2336 | struct lwp_info *event_child; |
bd99dc85 | 2337 | int options; |
bd99dc85 | 2338 | int pid; |
6bf5e0ba PA |
2339 | int step_over_finished; |
2340 | int bp_explains_trap; | |
2341 | int maybe_internal_trap; | |
2342 | int report_to_gdb; | |
219f2f23 | 2343 | int trace_event; |
c2d6af84 | 2344 | int in_step_range; |
bd99dc85 PA |
2345 | |
2346 | /* Translate generic target options into linux options. */ | |
2347 | options = __WALL; | |
2348 | if (target_options & TARGET_WNOHANG) | |
2349 | options |= WNOHANG; | |
0d62e5e8 DJ |
2350 | |
2351 | retry: | |
fa593d66 PA |
2352 | bp_explains_trap = 0; |
2353 | trace_event = 0; | |
c2d6af84 | 2354 | in_step_range = 0; |
bd99dc85 PA |
2355 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2356 | ||
0d62e5e8 DJ |
2357 | /* If we were only supposed to resume one thread, only wait for |
2358 | that thread - if it's still alive. If it died, however - which | |
2359 | can happen if we're coming from the thread death case below - | |
2360 | then we need to make sure we restart the other threads. We could | |
2361 | pick a thread at random or restart all; restarting all is less | |
2362 | arbitrary. */ | |
95954743 PA |
2363 | if (!non_stop |
2364 | && !ptid_equal (cont_thread, null_ptid) | |
2365 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2366 | { |
fc7238bb PA |
2367 | struct thread_info *thread; |
2368 | ||
bd99dc85 PA |
2369 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2370 | cont_thread); | |
0d62e5e8 DJ |
2371 | |
2372 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2373 | if (thread == NULL) |
64386c31 DJ |
2374 | { |
2375 | struct thread_resume resume_info; | |
95954743 | 2376 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2377 | resume_info.kind = resume_continue; |
2378 | resume_info.sig = 0; | |
2bd7c093 | 2379 | linux_resume (&resume_info, 1); |
64386c31 | 2380 | } |
bd99dc85 | 2381 | else |
95954743 | 2382 | ptid = cont_thread; |
0d62e5e8 | 2383 | } |
da6d8c04 | 2384 | |
6bf5e0ba PA |
2385 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2386 | pid = linux_wait_for_event (ptid, &w, options); | |
2387 | else | |
2388 | { | |
2389 | if (debug_threads) | |
2390 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2391 | target_pid_to_str (step_over_bkpt)); | |
2392 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2393 | } | |
2394 | ||
bd99dc85 | 2395 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2396 | return null_ptid; |
bd99dc85 | 2397 | |
6bf5e0ba | 2398 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2399 | |
0d62e5e8 DJ |
2400 | /* If we are waiting for a particular child, and it exited, |
2401 | linux_wait_for_event will return its exit status. Similarly if | |
2402 | the last child exited. If this is not the last child, however, | |
2403 | do not report it as exited until there is a 'thread exited' response | |
2404 | available in the remote protocol. Instead, just wait for another event. | |
2405 | This should be safe, because if the thread crashed we will already | |
2406 | have reported the termination signal to GDB; that should stop any | |
2407 | in-progress stepping operations, etc. | |
2408 | ||
2409 | Report the exit status of the last thread to exit. This matches | |
2410 | LinuxThreads' behavior. */ | |
2411 | ||
95954743 | 2412 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2413 | { |
bd99dc85 | 2414 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2415 | { |
bd99dc85 PA |
2416 | if (WIFEXITED (w)) |
2417 | { | |
2418 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2419 | ourstatus->value.integer = WEXITSTATUS (w); | |
2420 | ||
2421 | if (debug_threads) | |
493e2a69 MS |
2422 | fprintf (stderr, |
2423 | "\nChild exited with retcode = %x \n", | |
2424 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2425 | } |
2426 | else | |
2427 | { | |
2428 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2ea28649 | 2429 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); |
bd99dc85 PA |
2430 | |
2431 | if (debug_threads) | |
493e2a69 MS |
2432 | fprintf (stderr, |
2433 | "\nChild terminated with signal = %x \n", | |
2434 | WTERMSIG (w)); | |
bd99dc85 PA |
2435 | |
2436 | } | |
5b1c542e | 2437 | |
3e4c1235 | 2438 | return ptid_of (event_child); |
0d62e5e8 | 2439 | } |
da6d8c04 | 2440 | } |
0d62e5e8 | 2441 | else |
da6d8c04 | 2442 | { |
0d62e5e8 DJ |
2443 | if (!WIFSTOPPED (w)) |
2444 | goto retry; | |
da6d8c04 DJ |
2445 | } |
2446 | ||
6bf5e0ba PA |
2447 | /* If this event was not handled before, and is not a SIGTRAP, we |
2448 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2449 | a breakpoint is inserted at the current PC. If this target does | |
2450 | not support internal breakpoints at all, we also report the | |
2451 | SIGTRAP without further processing; it's of no concern to us. */ | |
2452 | maybe_internal_trap | |
2453 | = (supports_breakpoints () | |
2454 | && (WSTOPSIG (w) == SIGTRAP | |
2455 | || ((WSTOPSIG (w) == SIGILL | |
2456 | || WSTOPSIG (w) == SIGSEGV) | |
2457 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2458 | ||
2459 | if (maybe_internal_trap) | |
2460 | { | |
2461 | /* Handle anything that requires bookkeeping before deciding to | |
2462 | report the event or continue waiting. */ | |
2463 | ||
2464 | /* First check if we can explain the SIGTRAP with an internal | |
2465 | breakpoint, or if we should possibly report the event to GDB. | |
2466 | Do this before anything that may remove or insert a | |
2467 | breakpoint. */ | |
2468 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2469 | ||
2470 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2471 | finished. If so, tweak the state machine accordingly, | |
2472 | reinsert breakpoints and delete any reinsert (software | |
2473 | single-step) breakpoints. */ | |
2474 | step_over_finished = finish_step_over (event_child); | |
2475 | ||
2476 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2477 | check_breakpoints (event_child->stop_pc); | |
2478 | ||
219f2f23 PA |
2479 | /* Handle tracepoint data collecting. This may overflow the |
2480 | trace buffer, and cause a tracing stop, removing | |
2481 | breakpoints. */ | |
2482 | trace_event = handle_tracepoints (event_child); | |
2483 | ||
6bf5e0ba PA |
2484 | if (bp_explains_trap) |
2485 | { | |
2486 | /* If we stepped or ran into an internal breakpoint, we've | |
2487 | already handled it. So next time we resume (from this | |
2488 | PC), we should step over it. */ | |
2489 | if (debug_threads) | |
2490 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2491 | ||
8b07ae33 PA |
2492 | if (breakpoint_here (event_child->stop_pc)) |
2493 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2494 | } |
2495 | } | |
2496 | else | |
2497 | { | |
2498 | /* We have some other signal, possibly a step-over dance was in | |
2499 | progress, and it should be cancelled too. */ | |
2500 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2501 | } |
2502 | ||
2503 | /* We have all the data we need. Either report the event to GDB, or | |
2504 | resume threads and keep waiting for more. */ | |
2505 | ||
2506 | /* If we're collecting a fast tracepoint, finish the collection and | |
2507 | move out of the jump pad before delivering a signal. See | |
2508 | linux_stabilize_threads. */ | |
2509 | ||
2510 | if (WIFSTOPPED (w) | |
2511 | && WSTOPSIG (w) != SIGTRAP | |
2512 | && supports_fast_tracepoints () | |
58b4daa5 | 2513 | && agent_loaded_p ()) |
fa593d66 PA |
2514 | { |
2515 | if (debug_threads) | |
2516 | fprintf (stderr, | |
2517 | "Got signal %d for LWP %ld. Check if we need " | |
2518 | "to defer or adjust it.\n", | |
2519 | WSTOPSIG (w), lwpid_of (event_child)); | |
2520 | ||
2521 | /* Allow debugging the jump pad itself. */ | |
2522 | if (current_inferior->last_resume_kind != resume_step | |
2523 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2524 | { | |
2525 | enqueue_one_deferred_signal (event_child, &w); | |
2526 | ||
2527 | if (debug_threads) | |
2528 | fprintf (stderr, | |
2529 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2530 | WSTOPSIG (w), lwpid_of (event_child)); | |
2531 | ||
2532 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2533 | goto retry; | |
2534 | } | |
2535 | } | |
219f2f23 | 2536 | |
fa593d66 PA |
2537 | if (event_child->collecting_fast_tracepoint) |
2538 | { | |
2539 | if (debug_threads) | |
2540 | fprintf (stderr, "\ | |
2541 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2542 | Check if we're already there.\n", | |
2543 | lwpid_of (event_child), | |
2544 | event_child->collecting_fast_tracepoint); | |
2545 | ||
2546 | trace_event = 1; | |
2547 | ||
2548 | event_child->collecting_fast_tracepoint | |
2549 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2550 | ||
2551 | if (event_child->collecting_fast_tracepoint != 1) | |
2552 | { | |
2553 | /* No longer need this breakpoint. */ | |
2554 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2555 | { | |
2556 | if (debug_threads) | |
2557 | fprintf (stderr, | |
2558 | "No longer need exit-jump-pad bkpt; removing it." | |
2559 | "stopping all threads momentarily.\n"); | |
2560 | ||
2561 | /* Other running threads could hit this breakpoint. | |
2562 | We don't handle moribund locations like GDB does, | |
2563 | instead we always pause all threads when removing | |
2564 | breakpoints, so that any step-over or | |
2565 | decr_pc_after_break adjustment is always taken | |
2566 | care of while the breakpoint is still | |
2567 | inserted. */ | |
2568 | stop_all_lwps (1, event_child); | |
2569 | cancel_breakpoints (); | |
2570 | ||
2571 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2572 | event_child->exit_jump_pad_bkpt = NULL; | |
2573 | ||
2574 | unstop_all_lwps (1, event_child); | |
2575 | ||
2576 | gdb_assert (event_child->suspended >= 0); | |
2577 | } | |
2578 | } | |
2579 | ||
2580 | if (event_child->collecting_fast_tracepoint == 0) | |
2581 | { | |
2582 | if (debug_threads) | |
2583 | fprintf (stderr, | |
2584 | "fast tracepoint finished " | |
2585 | "collecting successfully.\n"); | |
2586 | ||
2587 | /* We may have a deferred signal to report. */ | |
2588 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2589 | { | |
2590 | if (debug_threads) | |
2591 | fprintf (stderr, "dequeued one signal.\n"); | |
2592 | } | |
3c11dd79 | 2593 | else |
fa593d66 | 2594 | { |
3c11dd79 PA |
2595 | if (debug_threads) |
2596 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2597 | |
2598 | if (stabilizing_threads) | |
2599 | { | |
2600 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2601 | ourstatus->value.sig = GDB_SIGNAL_0; |
fa593d66 PA |
2602 | return ptid_of (event_child); |
2603 | } | |
2604 | } | |
2605 | } | |
6bf5e0ba PA |
2606 | } |
2607 | ||
e471f25b PA |
2608 | /* Check whether GDB would be interested in this event. */ |
2609 | ||
2610 | /* If GDB is not interested in this signal, don't stop other | |
2611 | threads, and don't report it to GDB. Just resume the inferior | |
2612 | right away. We do this for threading-related signals as well as | |
2613 | any that GDB specifically requested we ignore. But never ignore | |
2614 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2615 | stepping - they may require special handling to skip the signal | |
2616 | handler. */ | |
2617 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2618 | thread library? */ | |
2619 | if (WIFSTOPPED (w) | |
2620 | && current_inferior->last_resume_kind != resume_step | |
2621 | && ( | |
1a981360 | 2622 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2623 | (current_process ()->private->thread_db != NULL |
2624 | && (WSTOPSIG (w) == __SIGRTMIN | |
2625 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2626 | || | |
2627 | #endif | |
2ea28649 | 2628 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b PA |
2629 | && !(WSTOPSIG (w) == SIGSTOP |
2630 | && current_inferior->last_resume_kind == resume_stop)))) | |
2631 | { | |
2632 | siginfo_t info, *info_p; | |
2633 | ||
2634 | if (debug_threads) | |
2635 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2636 | WSTOPSIG (w), lwpid_of (event_child)); | |
2637 | ||
56f7af9c MS |
2638 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), |
2639 | (PTRACE_ARG3_TYPE) 0, &info) == 0) | |
e471f25b PA |
2640 | info_p = &info; |
2641 | else | |
2642 | info_p = NULL; | |
2643 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2644 | WSTOPSIG (w), info_p); | |
2645 | goto retry; | |
2646 | } | |
2647 | ||
c2d6af84 PA |
2648 | /* Note that all addresses are always "out of the step range" when |
2649 | there's no range to begin with. */ | |
2650 | in_step_range = lwp_in_step_range (event_child); | |
2651 | ||
2652 | /* If GDB wanted this thread to single step, and the thread is out | |
2653 | of the step range, we always want to report the SIGTRAP, and let | |
2654 | GDB handle it. Watchpoints should always be reported. So should | |
2655 | signals we can't explain. A SIGTRAP we can't explain could be a | |
2656 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
2657 | do, we're be able to handle GDB breakpoints on top of internal | |
2658 | breakpoints, by handling the internal breakpoint and still | |
2659 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
2660 | won't see the breakpoint hit. */ | |
6bf5e0ba | 2661 | report_to_gdb = (!maybe_internal_trap |
c2d6af84 PA |
2662 | || (current_inferior->last_resume_kind == resume_step |
2663 | && !in_step_range) | |
6bf5e0ba | 2664 | || event_child->stopped_by_watchpoint |
c2d6af84 | 2665 | || (!step_over_finished && !in_step_range |
493e2a69 | 2666 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 2667 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2668 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2669 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2670 | ||
2671 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2672 | |
2673 | /* We found no reason GDB would want us to stop. We either hit one | |
2674 | of our own breakpoints, or finished an internal step GDB | |
2675 | shouldn't know about. */ | |
2676 | if (!report_to_gdb) | |
2677 | { | |
2678 | if (debug_threads) | |
2679 | { | |
2680 | if (bp_explains_trap) | |
2681 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2682 | if (step_over_finished) | |
2683 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2684 | if (trace_event) |
2685 | fprintf (stderr, "Tracepoint event.\n"); | |
c2d6af84 PA |
2686 | if (lwp_in_step_range (event_child)) |
2687 | fprintf (stderr, "Range stepping pc 0x%s [0x%s, 0x%s).\n", | |
2688 | paddress (event_child->stop_pc), | |
2689 | paddress (event_child->step_range_start), | |
2690 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
2691 | } |
2692 | ||
2693 | /* We're not reporting this breakpoint to GDB, so apply the | |
2694 | decr_pc_after_break adjustment to the inferior's regcache | |
2695 | ourselves. */ | |
2696 | ||
2697 | if (the_low_target.set_pc != NULL) | |
2698 | { | |
2699 | struct regcache *regcache | |
2700 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2701 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2702 | } | |
2703 | ||
7984d532 PA |
2704 | /* We may have finished stepping over a breakpoint. If so, |
2705 | we've stopped and suspended all LWPs momentarily except the | |
2706 | stepping one. This is where we resume them all again. We're | |
2707 | going to keep waiting, so use proceed, which handles stepping | |
2708 | over the next breakpoint. */ | |
6bf5e0ba PA |
2709 | if (debug_threads) |
2710 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2711 | |
2712 | if (step_over_finished) | |
2713 | unsuspend_all_lwps (event_child); | |
2714 | ||
6bf5e0ba PA |
2715 | proceed_all_lwps (); |
2716 | goto retry; | |
2717 | } | |
2718 | ||
2719 | if (debug_threads) | |
2720 | { | |
8336d594 | 2721 | if (current_inferior->last_resume_kind == resume_step) |
c2d6af84 PA |
2722 | { |
2723 | if (event_child->step_range_start == event_child->step_range_end) | |
2724 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); | |
2725 | else if (!lwp_in_step_range (event_child)) | |
2726 | fprintf (stderr, "Out of step range, reporting event.\n"); | |
2727 | } | |
6bf5e0ba PA |
2728 | if (event_child->stopped_by_watchpoint) |
2729 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2730 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2731 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2732 | if (debug_threads) |
2733 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2734 | } | |
2735 | ||
2736 | /* Alright, we're going to report a stop. */ | |
2737 | ||
fa593d66 | 2738 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2739 | { |
2740 | /* In all-stop, stop all threads. */ | |
7984d532 | 2741 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2742 | |
2743 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2744 | from among those that have had events. Giving equal priority | |
2745 | to all LWPs that have had events helps prevent | |
2746 | starvation. */ | |
2747 | if (ptid_equal (ptid, minus_one_ptid)) | |
2748 | { | |
2749 | event_child->status_pending_p = 1; | |
2750 | event_child->status_pending = w; | |
2751 | ||
2752 | select_event_lwp (&event_child); | |
2753 | ||
2754 | event_child->status_pending_p = 0; | |
2755 | w = event_child->status_pending; | |
2756 | } | |
2757 | ||
2758 | /* Now that we've selected our final event LWP, cancel any | |
2759 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2760 | See the comment in cancel_breakpoints_callback to find out | |
2761 | why. */ | |
2762 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 | 2763 | |
c03e6ccc YQ |
2764 | /* If we were going a step-over, all other threads but the stepping one |
2765 | had been paused in start_step_over, with their suspend counts | |
2766 | incremented. We don't want to do a full unstop/unpause, because we're | |
2767 | in all-stop mode (so we want threads stopped), but we still need to | |
2768 | unsuspend the other threads, to decrement their `suspended' count | |
2769 | back. */ | |
2770 | if (step_over_finished) | |
2771 | unsuspend_all_lwps (event_child); | |
2772 | ||
fa593d66 PA |
2773 | /* Stabilize threads (move out of jump pads). */ |
2774 | stabilize_threads (); | |
6bf5e0ba PA |
2775 | } |
2776 | else | |
2777 | { | |
2778 | /* If we just finished a step-over, then all threads had been | |
2779 | momentarily paused. In all-stop, that's fine, we want | |
2780 | threads stopped by now anyway. In non-stop, we need to | |
2781 | re-resume threads that GDB wanted to be running. */ | |
2782 | if (step_over_finished) | |
7984d532 | 2783 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2784 | } |
2785 | ||
5b1c542e | 2786 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2787 | |
8336d594 PA |
2788 | if (current_inferior->last_resume_kind == resume_stop |
2789 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2790 | { |
2791 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2792 | and it stopped cleanly, so report as SIG0. The use of | |
2793 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2794 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2795 | } |
8336d594 PA |
2796 | else if (current_inferior->last_resume_kind == resume_stop |
2797 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2798 | { |
2799 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2800 | but, it stopped for other reasons. */ |
2ea28649 | 2801 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2802 | } |
2803 | else | |
2804 | { | |
2ea28649 | 2805 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2806 | } |
2807 | ||
d50171e4 PA |
2808 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2809 | ||
bd99dc85 | 2810 | if (debug_threads) |
95954743 | 2811 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2812 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2813 | ourstatus->kind, |
2814 | ourstatus->value.sig); | |
2815 | ||
6bf5e0ba | 2816 | return ptid_of (event_child); |
bd99dc85 PA |
2817 | } |
2818 | ||
2819 | /* Get rid of any pending event in the pipe. */ | |
2820 | static void | |
2821 | async_file_flush (void) | |
2822 | { | |
2823 | int ret; | |
2824 | char buf; | |
2825 | ||
2826 | do | |
2827 | ret = read (linux_event_pipe[0], &buf, 1); | |
2828 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2829 | } | |
2830 | ||
2831 | /* Put something in the pipe, so the event loop wakes up. */ | |
2832 | static void | |
2833 | async_file_mark (void) | |
2834 | { | |
2835 | int ret; | |
2836 | ||
2837 | async_file_flush (); | |
2838 | ||
2839 | do | |
2840 | ret = write (linux_event_pipe[1], "+", 1); | |
2841 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2842 | ||
2843 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2844 | be awakened anyway. */ | |
2845 | } | |
2846 | ||
95954743 PA |
2847 | static ptid_t |
2848 | linux_wait (ptid_t ptid, | |
2849 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2850 | { |
95954743 | 2851 | ptid_t event_ptid; |
bd99dc85 PA |
2852 | |
2853 | if (debug_threads) | |
95954743 | 2854 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2855 | |
2856 | /* Flush the async file first. */ | |
2857 | if (target_is_async_p ()) | |
2858 | async_file_flush (); | |
2859 | ||
95954743 | 2860 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2861 | |
2862 | /* If at least one stop was reported, there may be more. A single | |
2863 | SIGCHLD can signal more than one child stop. */ | |
2864 | if (target_is_async_p () | |
2865 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2866 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2867 | async_file_mark (); |
2868 | ||
2869 | return event_ptid; | |
da6d8c04 DJ |
2870 | } |
2871 | ||
c5f62d5f | 2872 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2873 | |
2874 | static int | |
a1928bad | 2875 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2876 | { |
c5f62d5f DE |
2877 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2878 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2879 | |
c5f62d5f DE |
2880 | #ifdef __NR_tkill |
2881 | { | |
2882 | static int tkill_failed; | |
fd500816 | 2883 | |
c5f62d5f DE |
2884 | if (!tkill_failed) |
2885 | { | |
2886 | int ret; | |
2887 | ||
2888 | errno = 0; | |
2889 | ret = syscall (__NR_tkill, lwpid, signo); | |
2890 | if (errno != ENOSYS) | |
2891 | return ret; | |
2892 | tkill_failed = 1; | |
2893 | } | |
2894 | } | |
fd500816 DJ |
2895 | #endif |
2896 | ||
2897 | return kill (lwpid, signo); | |
2898 | } | |
2899 | ||
964e4306 PA |
2900 | void |
2901 | linux_stop_lwp (struct lwp_info *lwp) | |
2902 | { | |
2903 | send_sigstop (lwp); | |
2904 | } | |
2905 | ||
0d62e5e8 | 2906 | static void |
02fc4de7 | 2907 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2908 | { |
bd99dc85 | 2909 | int pid; |
0d62e5e8 | 2910 | |
bd99dc85 PA |
2911 | pid = lwpid_of (lwp); |
2912 | ||
0d62e5e8 DJ |
2913 | /* If we already have a pending stop signal for this process, don't |
2914 | send another. */ | |
54a0b537 | 2915 | if (lwp->stop_expected) |
0d62e5e8 | 2916 | { |
ae13219e | 2917 | if (debug_threads) |
bd99dc85 | 2918 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2919 | |
0d62e5e8 DJ |
2920 | return; |
2921 | } | |
2922 | ||
2923 | if (debug_threads) | |
bd99dc85 | 2924 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2925 | |
d50171e4 | 2926 | lwp->stop_expected = 1; |
bd99dc85 | 2927 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2928 | } |
2929 | ||
7984d532 PA |
2930 | static int |
2931 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2932 | { |
2933 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2934 | ||
7984d532 PA |
2935 | /* Ignore EXCEPT. */ |
2936 | if (lwp == except) | |
2937 | return 0; | |
2938 | ||
02fc4de7 | 2939 | if (lwp->stopped) |
7984d532 | 2940 | return 0; |
02fc4de7 PA |
2941 | |
2942 | send_sigstop (lwp); | |
7984d532 PA |
2943 | return 0; |
2944 | } | |
2945 | ||
2946 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2947 | yet. */ | |
2948 | static int | |
2949 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2950 | void *except) | |
2951 | { | |
2952 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2953 | ||
2954 | /* Ignore EXCEPT. */ | |
2955 | if (lwp == except) | |
2956 | return 0; | |
2957 | ||
2958 | lwp->suspended++; | |
2959 | ||
2960 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2961 | } |
2962 | ||
95954743 PA |
2963 | static void |
2964 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2965 | { | |
2966 | /* It's dead, really. */ | |
2967 | lwp->dead = 1; | |
2968 | ||
2969 | /* Store the exit status for later. */ | |
2970 | lwp->status_pending_p = 1; | |
2971 | lwp->status_pending = wstat; | |
2972 | ||
95954743 PA |
2973 | /* Prevent trying to stop it. */ |
2974 | lwp->stopped = 1; | |
2975 | ||
2976 | /* No further stops are expected from a dead lwp. */ | |
2977 | lwp->stop_expected = 0; | |
2978 | } | |
2979 | ||
0d62e5e8 DJ |
2980 | static void |
2981 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2982 | { | |
54a0b537 | 2983 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2984 | struct thread_info *saved_inferior; |
a1928bad | 2985 | int wstat; |
95954743 PA |
2986 | ptid_t saved_tid; |
2987 | ptid_t ptid; | |
d50171e4 | 2988 | int pid; |
0d62e5e8 | 2989 | |
54a0b537 | 2990 | if (lwp->stopped) |
d50171e4 PA |
2991 | { |
2992 | if (debug_threads) | |
2993 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2994 | lwpid_of (lwp)); | |
2995 | return; | |
2996 | } | |
0d62e5e8 DJ |
2997 | |
2998 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2999 | if (saved_inferior != NULL) |
3000 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
3001 | else | |
95954743 | 3002 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3003 | |
95954743 | 3004 | ptid = lwp->head.id; |
bd99dc85 | 3005 | |
d50171e4 PA |
3006 | if (debug_threads) |
3007 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
3008 | ||
3009 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
3010 | |
3011 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
3012 | and record the pending SIGSTOP. If the process exited, just | |
3013 | return. */ | |
d50171e4 | 3014 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
3015 | { |
3016 | if (debug_threads) | |
d50171e4 PA |
3017 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
3018 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 3019 | |
d50171e4 | 3020 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
3021 | { |
3022 | if (debug_threads) | |
d50171e4 PA |
3023 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
3024 | lwpid_of (lwp), wstat); | |
3025 | ||
c35fafde PA |
3026 | lwp->status_pending_p = 1; |
3027 | lwp->status_pending = wstat; | |
3028 | } | |
0d62e5e8 | 3029 | } |
d50171e4 | 3030 | else |
95954743 PA |
3031 | { |
3032 | if (debug_threads) | |
d50171e4 | 3033 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 3034 | |
d50171e4 PA |
3035 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
3036 | if (lwp) | |
3037 | { | |
3038 | /* Leave this status pending for the next time we're able to | |
3039 | report it. In the mean time, we'll report this lwp as | |
3040 | dead to GDB, so GDB doesn't try to read registers and | |
3041 | memory from it. This can only happen if this was the | |
3042 | last thread of the process; otherwise, PID is removed | |
3043 | from the thread tables before linux_wait_for_event | |
3044 | returns. */ | |
3045 | mark_lwp_dead (lwp, wstat); | |
3046 | } | |
95954743 | 3047 | } |
0d62e5e8 | 3048 | |
bd99dc85 | 3049 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
3050 | current_inferior = saved_inferior; |
3051 | else | |
3052 | { | |
3053 | if (debug_threads) | |
3054 | fprintf (stderr, "Previously current thread died.\n"); | |
3055 | ||
bd99dc85 PA |
3056 | if (non_stop) |
3057 | { | |
3058 | /* We can't change the current inferior behind GDB's back, | |
3059 | otherwise, a subsequent command may apply to the wrong | |
3060 | process. */ | |
3061 | current_inferior = NULL; | |
3062 | } | |
3063 | else | |
3064 | { | |
3065 | /* Set a valid thread as current. */ | |
3066 | set_desired_inferior (0); | |
3067 | } | |
0d62e5e8 DJ |
3068 | } |
3069 | } | |
3070 | ||
fa593d66 PA |
3071 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3072 | move it out, because we need to report the stop event to GDB. For | |
3073 | example, if the user puts a breakpoint in the jump pad, it's | |
3074 | because she wants to debug it. */ | |
3075 | ||
3076 | static int | |
3077 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3078 | { | |
3079 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3080 | struct thread_info *thread = get_lwp_thread (lwp); | |
3081 | ||
3082 | gdb_assert (lwp->suspended == 0); | |
3083 | gdb_assert (lwp->stopped); | |
3084 | ||
3085 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3086 | return (supports_fast_tracepoints () | |
58b4daa5 | 3087 | && agent_loaded_p () |
fa593d66 PA |
3088 | && (gdb_breakpoint_here (lwp->stop_pc) |
3089 | || lwp->stopped_by_watchpoint | |
3090 | || thread->last_resume_kind == resume_step) | |
3091 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3092 | } | |
3093 | ||
3094 | static void | |
3095 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3096 | { | |
3097 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3098 | struct thread_info *thread = get_lwp_thread (lwp); | |
3099 | int *wstat; | |
3100 | ||
3101 | gdb_assert (lwp->suspended == 0); | |
3102 | gdb_assert (lwp->stopped); | |
3103 | ||
3104 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3105 | ||
3106 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3107 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
3108 | && !lwp->stopped_by_watchpoint | |
3109 | && thread->last_resume_kind != resume_step | |
3110 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3111 | { | |
3112 | if (debug_threads) | |
3113 | fprintf (stderr, | |
3114 | "LWP %ld needs stabilizing (in jump pad)\n", | |
3115 | lwpid_of (lwp)); | |
3116 | ||
3117 | if (wstat) | |
3118 | { | |
3119 | lwp->status_pending_p = 0; | |
3120 | enqueue_one_deferred_signal (lwp, wstat); | |
3121 | ||
3122 | if (debug_threads) | |
3123 | fprintf (stderr, | |
3124 | "Signal %d for LWP %ld deferred " | |
3125 | "(in jump pad)\n", | |
3126 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
3127 | } | |
3128 | ||
3129 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3130 | } | |
3131 | else | |
3132 | lwp->suspended++; | |
3133 | } | |
3134 | ||
3135 | static int | |
3136 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3137 | { | |
3138 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3139 | ||
3140 | if (lwp->dead) | |
3141 | return 0; | |
3142 | if (lwp->stopped) | |
3143 | return 0; | |
3144 | return 1; | |
3145 | } | |
3146 | ||
7984d532 PA |
3147 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3148 | If SUSPEND, then also increase the suspend count of every LWP, | |
3149 | except EXCEPT. */ | |
3150 | ||
0d62e5e8 | 3151 | static void |
7984d532 | 3152 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3153 | { |
bde24c0a PA |
3154 | /* Should not be called recursively. */ |
3155 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3156 | ||
3157 | stopping_threads = (suspend | |
3158 | ? STOPPING_AND_SUSPENDING_THREADS | |
3159 | : STOPPING_THREADS); | |
7984d532 PA |
3160 | |
3161 | if (suspend) | |
3162 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
3163 | else | |
3164 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 3165 | for_each_inferior (&all_lwps, wait_for_sigstop); |
bde24c0a | 3166 | stopping_threads = NOT_STOPPING_THREADS; |
0d62e5e8 DJ |
3167 | } |
3168 | ||
da6d8c04 DJ |
3169 | /* Resume execution of the inferior process. |
3170 | If STEP is nonzero, single-step it. | |
3171 | If SIGNAL is nonzero, give it that signal. */ | |
3172 | ||
ce3a066d | 3173 | static void |
2acc282a | 3174 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3175 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3176 | { |
0d62e5e8 | 3177 | struct thread_info *saved_inferior; |
fa593d66 | 3178 | int fast_tp_collecting; |
0d62e5e8 | 3179 | |
54a0b537 | 3180 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3181 | return; |
3182 | ||
fa593d66 PA |
3183 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3184 | ||
3185 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3186 | ||
219f2f23 PA |
3187 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3188 | user used the "jump" command, or "set $pc = foo"). */ | |
3189 | if (lwp->stop_pc != get_pc (lwp)) | |
3190 | { | |
3191 | /* Collecting 'while-stepping' actions doesn't make sense | |
3192 | anymore. */ | |
3193 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
3194 | } | |
3195 | ||
0d62e5e8 DJ |
3196 | /* If we have pending signals or status, and a new signal, enqueue the |
3197 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3198 | breakpoint; it will be picked up again below. */ | |
3199 | if (signal != 0 | |
fa593d66 PA |
3200 | && (lwp->status_pending_p |
3201 | || lwp->pending_signals != NULL | |
3202 | || lwp->bp_reinsert != 0 | |
3203 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3204 | { |
3205 | struct pending_signals *p_sig; | |
bca929d3 | 3206 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3207 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3208 | p_sig->signal = signal; |
32ca6d61 DJ |
3209 | if (info == NULL) |
3210 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3211 | else | |
3212 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3213 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3214 | } |
3215 | ||
d50171e4 PA |
3216 | if (lwp->status_pending_p) |
3217 | { | |
3218 | if (debug_threads) | |
3219 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
3220 | " has pending status\n", | |
3221 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
3222 | lwp->stop_expected ? "expected" : "not expected"); | |
3223 | return; | |
3224 | } | |
0d62e5e8 DJ |
3225 | |
3226 | saved_inferior = current_inferior; | |
54a0b537 | 3227 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
3228 | |
3229 | if (debug_threads) | |
1b3f6016 | 3230 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 3231 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 3232 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3233 | |
3234 | /* This bit needs some thinking about. If we get a signal that | |
3235 | we must report while a single-step reinsert is still pending, | |
3236 | we often end up resuming the thread. It might be better to | |
3237 | (ew) allow a stack of pending events; then we could be sure that | |
3238 | the reinsert happened right away and not lose any signals. | |
3239 | ||
3240 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3241 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3242 | complete correctness, so it won't solve that problem. It may be |
3243 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3244 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3245 | { |
3246 | if (debug_threads) | |
d50171e4 PA |
3247 | fprintf (stderr, " pending reinsert at 0x%s\n", |
3248 | paddress (lwp->bp_reinsert)); | |
3249 | ||
85e00e85 | 3250 | if (can_hardware_single_step ()) |
d50171e4 | 3251 | { |
fa593d66 PA |
3252 | if (fast_tp_collecting == 0) |
3253 | { | |
3254 | if (step == 0) | |
3255 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3256 | if (lwp->suspended) | |
3257 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3258 | lwp->suspended); | |
3259 | } | |
d50171e4 PA |
3260 | |
3261 | step = 1; | |
3262 | } | |
0d62e5e8 DJ |
3263 | |
3264 | /* Postpone any pending signal. It was enqueued above. */ | |
3265 | signal = 0; | |
3266 | } | |
3267 | ||
fa593d66 PA |
3268 | if (fast_tp_collecting == 1) |
3269 | { | |
3270 | if (debug_threads) | |
3271 | fprintf (stderr, "\ | |
3272 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
3273 | lwpid_of (lwp)); | |
3274 | ||
3275 | /* Postpone any pending signal. It was enqueued above. */ | |
3276 | signal = 0; | |
3277 | } | |
3278 | else if (fast_tp_collecting == 2) | |
3279 | { | |
3280 | if (debug_threads) | |
3281 | fprintf (stderr, "\ | |
3282 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
3283 | lwpid_of (lwp)); | |
3284 | ||
3285 | if (can_hardware_single_step ()) | |
3286 | step = 1; | |
3287 | else | |
3288 | fatal ("moving out of jump pad single-stepping" | |
3289 | " not implemented on this target"); | |
3290 | ||
3291 | /* Postpone any pending signal. It was enqueued above. */ | |
3292 | signal = 0; | |
3293 | } | |
3294 | ||
219f2f23 PA |
3295 | /* If we have while-stepping actions in this thread set it stepping. |
3296 | If we have a signal to deliver, it may or may not be set to | |
3297 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3298 | while-stepping into a signal handler. A possible smart thing to | |
3299 | do would be to set an internal breakpoint at the signal return | |
3300 | address, continue, and carry on catching this while-stepping | |
3301 | action only when that breakpoint is hit. A future | |
3302 | enhancement. */ | |
3303 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
3304 | && can_hardware_single_step ()) | |
3305 | { | |
3306 | if (debug_threads) | |
3307 | fprintf (stderr, | |
3308 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
3309 | lwpid_of (lwp)); | |
3310 | step = 1; | |
3311 | } | |
3312 | ||
aa691b87 | 3313 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3314 | { |
442ea881 PA |
3315 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3316 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 3317 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3318 | } |
3319 | ||
fa593d66 PA |
3320 | /* If we have pending signals, consume one unless we are trying to |
3321 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3322 | collect. */ | |
3323 | if (lwp->pending_signals != NULL | |
3324 | && lwp->bp_reinsert == 0 | |
3325 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3326 | { |
3327 | struct pending_signals **p_sig; | |
3328 | ||
54a0b537 | 3329 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3330 | while ((*p_sig)->prev != NULL) |
3331 | p_sig = &(*p_sig)->prev; | |
3332 | ||
3333 | signal = (*p_sig)->signal; | |
32ca6d61 | 3334 | if ((*p_sig)->info.si_signo != 0) |
56f7af9c MS |
3335 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
3336 | &(*p_sig)->info); | |
32ca6d61 | 3337 | |
0d62e5e8 DJ |
3338 | free (*p_sig); |
3339 | *p_sig = NULL; | |
3340 | } | |
3341 | ||
aa5ca48f DE |
3342 | if (the_low_target.prepare_to_resume != NULL) |
3343 | the_low_target.prepare_to_resume (lwp); | |
3344 | ||
3aee8918 | 3345 | regcache_invalidate_thread (get_lwp_thread (lwp)); |
da6d8c04 | 3346 | errno = 0; |
54a0b537 | 3347 | lwp->stopped = 0; |
c3adc08c | 3348 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3349 | lwp->stepping = step; |
56f7af9c MS |
3350 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), |
3351 | (PTRACE_ARG3_TYPE) 0, | |
14ce3065 DE |
3352 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3353 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
3354 | (PTRACE_ARG4_TYPE) (uintptr_t) signal); | |
0d62e5e8 DJ |
3355 | |
3356 | current_inferior = saved_inferior; | |
da6d8c04 | 3357 | if (errno) |
3221518c UW |
3358 | { |
3359 | /* ESRCH from ptrace either means that the thread was already | |
3360 | running (an error) or that it is gone (a race condition). If | |
3361 | it's gone, we will get a notification the next time we wait, | |
3362 | so we can ignore the error. We could differentiate these | |
3363 | two, but it's tricky without waiting; the thread still exists | |
3364 | as a zombie, so sending it signal 0 would succeed. So just | |
3365 | ignore ESRCH. */ | |
3366 | if (errno == ESRCH) | |
3367 | return; | |
3368 | ||
3369 | perror_with_name ("ptrace"); | |
3370 | } | |
da6d8c04 DJ |
3371 | } |
3372 | ||
2bd7c093 PA |
3373 | struct thread_resume_array |
3374 | { | |
3375 | struct thread_resume *resume; | |
3376 | size_t n; | |
3377 | }; | |
64386c31 DJ |
3378 | |
3379 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
3380 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
3381 | resume request. | |
3382 | ||
3383 | This algorithm is O(threads * resume elements), but resume elements | |
3384 | is small (and will remain small at least until GDB supports thread | |
3385 | suspension). */ | |
2bd7c093 PA |
3386 | static int |
3387 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3388 | { |
54a0b537 | 3389 | struct lwp_info *lwp; |
64386c31 | 3390 | struct thread_info *thread; |
5544ad89 | 3391 | int ndx; |
2bd7c093 | 3392 | struct thread_resume_array *r; |
64386c31 DJ |
3393 | |
3394 | thread = (struct thread_info *) entry; | |
54a0b537 | 3395 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3396 | r = arg; |
64386c31 | 3397 | |
2bd7c093 | 3398 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3399 | { |
3400 | ptid_t ptid = r->resume[ndx].thread; | |
3401 | if (ptid_equal (ptid, minus_one_ptid) | |
3402 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3403 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3404 | of PID'. */ | |
3405 | || (ptid_get_pid (ptid) == pid_of (lwp) | |
3406 | && (ptid_is_pid (ptid) | |
3407 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3408 | { |
d50171e4 | 3409 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3410 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3411 | { |
3412 | if (debug_threads) | |
3413 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3414 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3415 | ? "stopped" | |
3416 | : "stopping", | |
3417 | lwpid_of (lwp)); | |
3418 | ||
3419 | continue; | |
3420 | } | |
3421 | ||
95954743 | 3422 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3423 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3424 | |
c2d6af84 PA |
3425 | lwp->step_range_start = lwp->resume->step_range_start; |
3426 | lwp->step_range_end = lwp->resume->step_range_end; | |
3427 | ||
fa593d66 PA |
3428 | /* If we had a deferred signal to report, dequeue one now. |
3429 | This can happen if LWP gets more than one signal while | |
3430 | trying to get out of a jump pad. */ | |
3431 | if (lwp->stopped | |
3432 | && !lwp->status_pending_p | |
3433 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3434 | { | |
3435 | lwp->status_pending_p = 1; | |
3436 | ||
3437 | if (debug_threads) | |
3438 | fprintf (stderr, | |
3439 | "Dequeueing deferred signal %d for LWP %ld, " | |
3440 | "leaving status pending.\n", | |
3441 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3442 | } | |
3443 | ||
95954743 PA |
3444 | return 0; |
3445 | } | |
3446 | } | |
2bd7c093 PA |
3447 | |
3448 | /* No resume action for this thread. */ | |
3449 | lwp->resume = NULL; | |
64386c31 | 3450 | |
2bd7c093 | 3451 | return 0; |
5544ad89 DJ |
3452 | } |
3453 | ||
5544ad89 | 3454 | |
bd99dc85 PA |
3455 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3456 | static int | |
3457 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3458 | { |
bd99dc85 | 3459 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3460 | |
bd99dc85 PA |
3461 | /* LWPs which will not be resumed are not interesting, because |
3462 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3463 | if (lwp->resume == NULL) |
bd99dc85 | 3464 | return 0; |
64386c31 | 3465 | |
bd99dc85 | 3466 | if (lwp->status_pending_p) |
d50171e4 PA |
3467 | * (int *) flag_p = 1; |
3468 | ||
3469 | return 0; | |
3470 | } | |
3471 | ||
3472 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3473 | internal breakpoint that we need to step over. It assumes that any | |
3474 | required STOP_PC adjustment has already been propagated to the | |
3475 | inferior's regcache. */ | |
3476 | ||
3477 | static int | |
3478 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3479 | { | |
3480 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3481 | struct thread_info *thread; |
d50171e4 PA |
3482 | struct thread_info *saved_inferior; |
3483 | CORE_ADDR pc; | |
3484 | ||
3485 | /* LWPs which will not be resumed are not interesting, because we | |
3486 | might not wait for them next time through linux_wait. */ | |
3487 | ||
3488 | if (!lwp->stopped) | |
3489 | { | |
3490 | if (debug_threads) | |
3491 | fprintf (stderr, | |
3492 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3493 | lwpid_of (lwp)); | |
3494 | return 0; | |
3495 | } | |
3496 | ||
8336d594 PA |
3497 | thread = get_lwp_thread (lwp); |
3498 | ||
3499 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3500 | { |
3501 | if (debug_threads) | |
3502 | fprintf (stderr, | |
3503 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3504 | lwpid_of (lwp)); | |
3505 | return 0; | |
3506 | } | |
3507 | ||
7984d532 PA |
3508 | gdb_assert (lwp->suspended >= 0); |
3509 | ||
3510 | if (lwp->suspended) | |
3511 | { | |
3512 | if (debug_threads) | |
3513 | fprintf (stderr, | |
3514 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3515 | lwpid_of (lwp)); | |
3516 | return 0; | |
3517 | } | |
3518 | ||
d50171e4 PA |
3519 | if (!lwp->need_step_over) |
3520 | { | |
3521 | if (debug_threads) | |
3522 | fprintf (stderr, | |
3523 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3524 | } | |
5544ad89 | 3525 | |
bd99dc85 | 3526 | if (lwp->status_pending_p) |
d50171e4 PA |
3527 | { |
3528 | if (debug_threads) | |
3529 | fprintf (stderr, | |
3530 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3531 | lwpid_of (lwp)); | |
3532 | return 0; | |
3533 | } | |
3534 | ||
3535 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3536 | or we have. */ | |
3537 | pc = get_pc (lwp); | |
3538 | ||
3539 | /* If the PC has changed since we stopped, then don't do anything, | |
3540 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3541 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3542 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3543 | command, or poked thread's registers herself. */ | |
3544 | if (pc != lwp->stop_pc) | |
3545 | { | |
3546 | if (debug_threads) | |
3547 | fprintf (stderr, | |
3548 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3549 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3550 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3551 | ||
3552 | lwp->need_step_over = 0; | |
3553 | return 0; | |
3554 | } | |
3555 | ||
3556 | saved_inferior = current_inferior; | |
8336d594 | 3557 | current_inferior = thread; |
d50171e4 | 3558 | |
8b07ae33 | 3559 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3560 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3561 | { |
8b07ae33 | 3562 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3563 | though. If the condition is being evaluated on the target's side |
3564 | and it evaluate to false, step over this breakpoint as well. */ | |
3565 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3566 | && gdb_condition_true_at_breakpoint (pc) |
3567 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3568 | { |
3569 | if (debug_threads) | |
3570 | fprintf (stderr, | |
3571 | "Need step over [LWP %ld]? yes, but found" | |
3572 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3573 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3574 | |
8b07ae33 PA |
3575 | current_inferior = saved_inferior; |
3576 | return 0; | |
3577 | } | |
3578 | else | |
3579 | { | |
3580 | if (debug_threads) | |
3581 | fprintf (stderr, | |
493e2a69 MS |
3582 | "Need step over [LWP %ld]? yes, " |
3583 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3584 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3585 | |
8b07ae33 PA |
3586 | /* We've found an lwp that needs stepping over --- return 1 so |
3587 | that find_inferior stops looking. */ | |
3588 | current_inferior = saved_inferior; | |
3589 | ||
3590 | /* If the step over is cancelled, this is set again. */ | |
3591 | lwp->need_step_over = 0; | |
3592 | return 1; | |
3593 | } | |
d50171e4 PA |
3594 | } |
3595 | ||
3596 | current_inferior = saved_inferior; | |
3597 | ||
3598 | if (debug_threads) | |
3599 | fprintf (stderr, | |
3600 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3601 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3602 | |
bd99dc85 | 3603 | return 0; |
5544ad89 DJ |
3604 | } |
3605 | ||
d50171e4 PA |
3606 | /* Start a step-over operation on LWP. When LWP stopped at a |
3607 | breakpoint, to make progress, we need to remove the breakpoint out | |
3608 | of the way. If we let other threads run while we do that, they may | |
3609 | pass by the breakpoint location and miss hitting it. To avoid | |
3610 | that, a step-over momentarily stops all threads while LWP is | |
3611 | single-stepped while the breakpoint is temporarily uninserted from | |
3612 | the inferior. When the single-step finishes, we reinsert the | |
3613 | breakpoint, and let all threads that are supposed to be running, | |
3614 | run again. | |
3615 | ||
3616 | On targets that don't support hardware single-step, we don't | |
3617 | currently support full software single-stepping. Instead, we only | |
3618 | support stepping over the thread event breakpoint, by asking the | |
3619 | low target where to place a reinsert breakpoint. Since this | |
3620 | routine assumes the breakpoint being stepped over is a thread event | |
3621 | breakpoint, it usually assumes the return address of the current | |
3622 | function is a good enough place to set the reinsert breakpoint. */ | |
3623 | ||
3624 | static int | |
3625 | start_step_over (struct lwp_info *lwp) | |
3626 | { | |
3627 | struct thread_info *saved_inferior; | |
3628 | CORE_ADDR pc; | |
3629 | int step; | |
3630 | ||
3631 | if (debug_threads) | |
3632 | fprintf (stderr, | |
3633 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3634 | lwpid_of (lwp)); | |
3635 | ||
7984d532 PA |
3636 | stop_all_lwps (1, lwp); |
3637 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3638 | |
3639 | if (debug_threads) | |
3640 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3641 | ||
3642 | /* Note, we should always reach here with an already adjusted PC, | |
3643 | either by GDB (if we're resuming due to GDB's request), or by our | |
3644 | caller, if we just finished handling an internal breakpoint GDB | |
3645 | shouldn't care about. */ | |
3646 | pc = get_pc (lwp); | |
3647 | ||
3648 | saved_inferior = current_inferior; | |
3649 | current_inferior = get_lwp_thread (lwp); | |
3650 | ||
3651 | lwp->bp_reinsert = pc; | |
3652 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3653 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3654 | |
3655 | if (can_hardware_single_step ()) | |
3656 | { | |
3657 | step = 1; | |
3658 | } | |
3659 | else | |
3660 | { | |
3661 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3662 | set_reinsert_breakpoint (raddr); | |
3663 | step = 0; | |
3664 | } | |
3665 | ||
3666 | current_inferior = saved_inferior; | |
3667 | ||
3668 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3669 | ||
3670 | /* Require next event from this LWP. */ | |
3671 | step_over_bkpt = lwp->head.id; | |
3672 | return 1; | |
3673 | } | |
3674 | ||
3675 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3676 | start_step_over, if still there, and delete any reinsert | |
3677 | breakpoints we've set, on non hardware single-step targets. */ | |
3678 | ||
3679 | static int | |
3680 | finish_step_over (struct lwp_info *lwp) | |
3681 | { | |
3682 | if (lwp->bp_reinsert != 0) | |
3683 | { | |
3684 | if (debug_threads) | |
3685 | fprintf (stderr, "Finished step over.\n"); | |
3686 | ||
3687 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3688 | may be no breakpoint to reinsert there by now. */ | |
3689 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3690 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3691 | |
3692 | lwp->bp_reinsert = 0; | |
3693 | ||
3694 | /* Delete any software-single-step reinsert breakpoints. No | |
3695 | longer needed. We don't have to worry about other threads | |
3696 | hitting this trap, and later not being able to explain it, | |
3697 | because we were stepping over a breakpoint, and we hold all | |
3698 | threads but LWP stopped while doing that. */ | |
3699 | if (!can_hardware_single_step ()) | |
3700 | delete_reinsert_breakpoints (); | |
3701 | ||
3702 | step_over_bkpt = null_ptid; | |
3703 | return 1; | |
3704 | } | |
3705 | else | |
3706 | return 0; | |
3707 | } | |
3708 | ||
5544ad89 DJ |
3709 | /* This function is called once per thread. We check the thread's resume |
3710 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3711 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3712 | |
bd99dc85 PA |
3713 | For threads which we aren't explicitly told otherwise, we preserve |
3714 | the stepping flag; this is used for stepping over gdbserver-placed | |
3715 | breakpoints. | |
3716 | ||
3717 | If pending_flags was set in any thread, we queue any needed | |
3718 | signals, since we won't actually resume. We already have a pending | |
3719 | event to report, so we don't need to preserve any step requests; | |
3720 | they should be re-issued if necessary. */ | |
3721 | ||
3722 | static int | |
3723 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3724 | { |
54a0b537 | 3725 | struct lwp_info *lwp; |
5544ad89 | 3726 | struct thread_info *thread; |
bd99dc85 | 3727 | int step; |
d50171e4 PA |
3728 | int leave_all_stopped = * (int *) arg; |
3729 | int leave_pending; | |
5544ad89 DJ |
3730 | |
3731 | thread = (struct thread_info *) entry; | |
54a0b537 | 3732 | lwp = get_thread_lwp (thread); |
5544ad89 | 3733 | |
2bd7c093 | 3734 | if (lwp->resume == NULL) |
bd99dc85 | 3735 | return 0; |
5544ad89 | 3736 | |
bd99dc85 | 3737 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3738 | { |
bd99dc85 | 3739 | if (debug_threads) |
d50171e4 | 3740 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3741 | |
3742 | if (!lwp->stopped) | |
3743 | { | |
3744 | if (debug_threads) | |
d50171e4 | 3745 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3746 | |
d50171e4 PA |
3747 | /* Stop the thread, and wait for the event asynchronously, |
3748 | through the event loop. */ | |
02fc4de7 | 3749 | send_sigstop (lwp); |
bd99dc85 PA |
3750 | } |
3751 | else | |
3752 | { | |
3753 | if (debug_threads) | |
d50171e4 PA |
3754 | fprintf (stderr, "already stopped LWP %ld\n", |
3755 | lwpid_of (lwp)); | |
3756 | ||
3757 | /* The LWP may have been stopped in an internal event that | |
3758 | was not meant to be notified back to GDB (e.g., gdbserver | |
3759 | breakpoint), so we should be reporting a stop event in | |
3760 | this case too. */ | |
3761 | ||
3762 | /* If the thread already has a pending SIGSTOP, this is a | |
3763 | no-op. Otherwise, something later will presumably resume | |
3764 | the thread and this will cause it to cancel any pending | |
3765 | operation, due to last_resume_kind == resume_stop. If | |
3766 | the thread already has a pending status to report, we | |
3767 | will still report it the next time we wait - see | |
3768 | status_pending_p_callback. */ | |
1a981360 PA |
3769 | |
3770 | /* If we already have a pending signal to report, then | |
3771 | there's no need to queue a SIGSTOP, as this means we're | |
3772 | midway through moving the LWP out of the jumppad, and we | |
3773 | will report the pending signal as soon as that is | |
3774 | finished. */ | |
3775 | if (lwp->pending_signals_to_report == NULL) | |
3776 | send_sigstop (lwp); | |
bd99dc85 | 3777 | } |
32ca6d61 | 3778 | |
bd99dc85 PA |
3779 | /* For stop requests, we're done. */ |
3780 | lwp->resume = NULL; | |
fc7238bb | 3781 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3782 | return 0; |
5544ad89 DJ |
3783 | } |
3784 | ||
bd99dc85 PA |
3785 | /* If this thread which is about to be resumed has a pending status, |
3786 | then don't resume any threads - we can just report the pending | |
3787 | status. Make sure to queue any signals that would otherwise be | |
3788 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3789 | thread has a pending status. If there's a thread that needs the |
3790 | step-over-breakpoint dance, then don't resume any other thread | |
3791 | but that particular one. */ | |
3792 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3793 | |
d50171e4 | 3794 | if (!leave_pending) |
bd99dc85 PA |
3795 | { |
3796 | if (debug_threads) | |
3797 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3798 | |
d50171e4 | 3799 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3800 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3801 | } |
3802 | else | |
3803 | { | |
3804 | if (debug_threads) | |
3805 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3806 | |
bd99dc85 PA |
3807 | /* If we have a new signal, enqueue the signal. */ |
3808 | if (lwp->resume->sig != 0) | |
3809 | { | |
3810 | struct pending_signals *p_sig; | |
3811 | p_sig = xmalloc (sizeof (*p_sig)); | |
3812 | p_sig->prev = lwp->pending_signals; | |
3813 | p_sig->signal = lwp->resume->sig; | |
3814 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3815 | ||
3816 | /* If this is the same signal we were previously stopped by, | |
3817 | make sure to queue its siginfo. We can ignore the return | |
3818 | value of ptrace; if it fails, we'll skip | |
3819 | PTRACE_SETSIGINFO. */ | |
3820 | if (WIFSTOPPED (lwp->last_status) | |
3821 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
56f7af9c MS |
3822 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), (PTRACE_ARG3_TYPE) 0, |
3823 | &p_sig->info); | |
bd99dc85 PA |
3824 | |
3825 | lwp->pending_signals = p_sig; | |
3826 | } | |
3827 | } | |
5544ad89 | 3828 | |
fc7238bb | 3829 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3830 | lwp->resume = NULL; |
5544ad89 | 3831 | return 0; |
0d62e5e8 DJ |
3832 | } |
3833 | ||
3834 | static void | |
2bd7c093 | 3835 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3836 | { |
2bd7c093 | 3837 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3838 | struct lwp_info *need_step_over = NULL; |
3839 | int any_pending; | |
3840 | int leave_all_stopped; | |
c6ecbae5 | 3841 | |
2bd7c093 | 3842 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3843 | |
d50171e4 PA |
3844 | /* If there is a thread which would otherwise be resumed, which has |
3845 | a pending status, then don't resume any threads - we can just | |
3846 | report the pending status. Make sure to queue any signals that | |
3847 | would otherwise be sent. In non-stop mode, we'll apply this | |
3848 | logic to each thread individually. We consume all pending events | |
3849 | before considering to start a step-over (in all-stop). */ | |
3850 | any_pending = 0; | |
bd99dc85 | 3851 | if (!non_stop) |
d50171e4 PA |
3852 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3853 | ||
3854 | /* If there is a thread which would otherwise be resumed, which is | |
3855 | stopped at a breakpoint that needs stepping over, then don't | |
3856 | resume any threads - have it step over the breakpoint with all | |
3857 | other threads stopped, then resume all threads again. Make sure | |
3858 | to queue any signals that would otherwise be delivered or | |
3859 | queued. */ | |
3860 | if (!any_pending && supports_breakpoints ()) | |
3861 | need_step_over | |
3862 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3863 | need_step_over_p, NULL); | |
3864 | ||
3865 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3866 | ||
3867 | if (debug_threads) | |
3868 | { | |
3869 | if (need_step_over != NULL) | |
3870 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3871 | else if (any_pending) | |
3872 | fprintf (stderr, | |
3873 | "Not resuming, all-stop and found " | |
3874 | "an LWP with pending status\n"); | |
3875 | else | |
3876 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3877 | } | |
3878 | ||
3879 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3880 | otherwise deliver. */ | |
3881 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3882 | ||
3883 | if (need_step_over) | |
3884 | start_step_over (need_step_over); | |
3885 | } | |
3886 | ||
3887 | /* This function is called once per thread. We check the thread's | |
3888 | last resume request, which will tell us whether to resume, step, or | |
3889 | leave the thread stopped. Any signal the client requested to be | |
3890 | delivered has already been enqueued at this point. | |
3891 | ||
3892 | If any thread that GDB wants running is stopped at an internal | |
3893 | breakpoint that needs stepping over, we start a step-over operation | |
3894 | on that particular thread, and leave all others stopped. */ | |
3895 | ||
7984d532 PA |
3896 | static int |
3897 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3898 | { |
7984d532 | 3899 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3900 | struct thread_info *thread; |
d50171e4 PA |
3901 | int step; |
3902 | ||
7984d532 PA |
3903 | if (lwp == except) |
3904 | return 0; | |
d50171e4 PA |
3905 | |
3906 | if (debug_threads) | |
3907 | fprintf (stderr, | |
3908 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3909 | ||
3910 | if (!lwp->stopped) | |
3911 | { | |
3912 | if (debug_threads) | |
3913 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3914 | return 0; |
d50171e4 PA |
3915 | } |
3916 | ||
8336d594 PA |
3917 | thread = get_lwp_thread (lwp); |
3918 | ||
02fc4de7 PA |
3919 | if (thread->last_resume_kind == resume_stop |
3920 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3921 | { |
3922 | if (debug_threads) | |
02fc4de7 PA |
3923 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3924 | lwpid_of (lwp)); | |
7984d532 | 3925 | return 0; |
d50171e4 PA |
3926 | } |
3927 | ||
3928 | if (lwp->status_pending_p) | |
3929 | { | |
3930 | if (debug_threads) | |
3931 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3932 | lwpid_of (lwp)); | |
7984d532 | 3933 | return 0; |
d50171e4 PA |
3934 | } |
3935 | ||
7984d532 PA |
3936 | gdb_assert (lwp->suspended >= 0); |
3937 | ||
d50171e4 PA |
3938 | if (lwp->suspended) |
3939 | { | |
3940 | if (debug_threads) | |
3941 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3942 | return 0; |
d50171e4 PA |
3943 | } |
3944 | ||
1a981360 PA |
3945 | if (thread->last_resume_kind == resume_stop |
3946 | && lwp->pending_signals_to_report == NULL | |
3947 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3948 | { |
3949 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3950 | last_status.kind check above would catch it, and we wouldn't | |
3951 | reach here. This LWP may have been momentarily paused by a | |
3952 | stop_all_lwps call while handling for example, another LWP's | |
3953 | step-over. In that case, the pending expected SIGSTOP signal | |
3954 | that was queued at vCont;t handling time will have already | |
3955 | been consumed by wait_for_sigstop, and so we need to requeue | |
3956 | another one here. Note that if the LWP already has a SIGSTOP | |
3957 | pending, this is a no-op. */ | |
3958 | ||
3959 | if (debug_threads) | |
3960 | fprintf (stderr, | |
3961 | "Client wants LWP %ld to stop. " | |
3962 | "Making sure it has a SIGSTOP pending\n", | |
3963 | lwpid_of (lwp)); | |
3964 | ||
3965 | send_sigstop (lwp); | |
3966 | } | |
3967 | ||
8336d594 | 3968 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3969 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3970 | return 0; |
3971 | } | |
3972 | ||
3973 | static int | |
3974 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3975 | { | |
3976 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3977 | ||
3978 | if (lwp == except) | |
3979 | return 0; | |
3980 | ||
3981 | lwp->suspended--; | |
3982 | gdb_assert (lwp->suspended >= 0); | |
3983 | ||
3984 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3985 | } |
3986 | ||
3987 | /* When we finish a step-over, set threads running again. If there's | |
3988 | another thread that may need a step-over, now's the time to start | |
3989 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3990 | ||
3991 | static void | |
3992 | proceed_all_lwps (void) | |
3993 | { | |
3994 | struct lwp_info *need_step_over; | |
3995 | ||
3996 | /* If there is a thread which would otherwise be resumed, which is | |
3997 | stopped at a breakpoint that needs stepping over, then don't | |
3998 | resume any threads - have it step over the breakpoint with all | |
3999 | other threads stopped, then resume all threads again. */ | |
4000 | ||
4001 | if (supports_breakpoints ()) | |
4002 | { | |
4003 | need_step_over | |
4004 | = (struct lwp_info *) find_inferior (&all_lwps, | |
4005 | need_step_over_p, NULL); | |
4006 | ||
4007 | if (need_step_over != NULL) | |
4008 | { | |
4009 | if (debug_threads) | |
4010 | fprintf (stderr, "proceed_all_lwps: found " | |
4011 | "thread %ld needing a step-over\n", | |
4012 | lwpid_of (need_step_over)); | |
4013 | ||
4014 | start_step_over (need_step_over); | |
4015 | return; | |
4016 | } | |
4017 | } | |
5544ad89 | 4018 | |
d50171e4 PA |
4019 | if (debug_threads) |
4020 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
4021 | ||
7984d532 | 4022 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
4023 | } |
4024 | ||
4025 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4026 | pending statuses, are set to run again, except for EXCEPT, if not | |
4027 | NULL. This undoes a stop_all_lwps call. */ | |
4028 | ||
4029 | static void | |
7984d532 | 4030 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4031 | { |
5544ad89 DJ |
4032 | if (debug_threads) |
4033 | { | |
d50171e4 PA |
4034 | if (except) |
4035 | fprintf (stderr, | |
4036 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 4037 | else |
d50171e4 PA |
4038 | fprintf (stderr, |
4039 | "unstopping all lwps\n"); | |
5544ad89 DJ |
4040 | } |
4041 | ||
7984d532 PA |
4042 | if (unsuspend) |
4043 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
4044 | else | |
4045 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
4046 | } |
4047 | ||
58caa3dc DJ |
4048 | |
4049 | #ifdef HAVE_LINUX_REGSETS | |
4050 | ||
1faeff08 MR |
4051 | #define use_linux_regsets 1 |
4052 | ||
030031ee PA |
4053 | /* Returns true if REGSET has been disabled. */ |
4054 | ||
4055 | static int | |
4056 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4057 | { | |
4058 | return (info->disabled_regsets != NULL | |
4059 | && info->disabled_regsets[regset - info->regsets]); | |
4060 | } | |
4061 | ||
4062 | /* Disable REGSET. */ | |
4063 | ||
4064 | static void | |
4065 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4066 | { | |
4067 | int dr_offset; | |
4068 | ||
4069 | dr_offset = regset - info->regsets; | |
4070 | if (info->disabled_regsets == NULL) | |
4071 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4072 | info->disabled_regsets[dr_offset] = 1; | |
4073 | } | |
4074 | ||
58caa3dc | 4075 | static int |
3aee8918 PA |
4076 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4077 | struct regcache *regcache) | |
58caa3dc DJ |
4078 | { |
4079 | struct regset_info *regset; | |
e9d25b98 | 4080 | int saw_general_regs = 0; |
95954743 | 4081 | int pid; |
1570b33e | 4082 | struct iovec iov; |
58caa3dc | 4083 | |
3aee8918 | 4084 | regset = regsets_info->regsets; |
58caa3dc | 4085 | |
95954743 | 4086 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4087 | while (regset->size >= 0) |
4088 | { | |
1570b33e L |
4089 | void *buf, *data; |
4090 | int nt_type, res; | |
58caa3dc | 4091 | |
030031ee | 4092 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4093 | { |
4094 | regset ++; | |
4095 | continue; | |
4096 | } | |
4097 | ||
bca929d3 | 4098 | buf = xmalloc (regset->size); |
1570b33e L |
4099 | |
4100 | nt_type = regset->nt_type; | |
4101 | if (nt_type) | |
4102 | { | |
4103 | iov.iov_base = buf; | |
4104 | iov.iov_len = regset->size; | |
4105 | data = (void *) &iov; | |
4106 | } | |
4107 | else | |
4108 | data = buf; | |
4109 | ||
dfb64f85 | 4110 | #ifndef __sparc__ |
f15f9948 TJB |
4111 | res = ptrace (regset->get_request, pid, |
4112 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4113 | #else |
1570b33e | 4114 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4115 | #endif |
58caa3dc DJ |
4116 | if (res < 0) |
4117 | { | |
4118 | if (errno == EIO) | |
4119 | { | |
52fa2412 | 4120 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4121 | this process mode. */ |
030031ee | 4122 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4123 | free (buf); |
52fa2412 | 4124 | continue; |
58caa3dc DJ |
4125 | } |
4126 | else | |
4127 | { | |
0d62e5e8 | 4128 | char s[256]; |
95954743 PA |
4129 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4130 | pid); | |
0d62e5e8 | 4131 | perror (s); |
58caa3dc DJ |
4132 | } |
4133 | } | |
e9d25b98 DJ |
4134 | else if (regset->type == GENERAL_REGS) |
4135 | saw_general_regs = 1; | |
442ea881 | 4136 | regset->store_function (regcache, buf); |
58caa3dc | 4137 | regset ++; |
fdeb2a12 | 4138 | free (buf); |
58caa3dc | 4139 | } |
e9d25b98 DJ |
4140 | if (saw_general_regs) |
4141 | return 0; | |
4142 | else | |
4143 | return 1; | |
58caa3dc DJ |
4144 | } |
4145 | ||
4146 | static int | |
3aee8918 PA |
4147 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4148 | struct regcache *regcache) | |
58caa3dc DJ |
4149 | { |
4150 | struct regset_info *regset; | |
e9d25b98 | 4151 | int saw_general_regs = 0; |
95954743 | 4152 | int pid; |
1570b33e | 4153 | struct iovec iov; |
58caa3dc | 4154 | |
3aee8918 | 4155 | regset = regsets_info->regsets; |
58caa3dc | 4156 | |
95954743 | 4157 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4158 | while (regset->size >= 0) |
4159 | { | |
1570b33e L |
4160 | void *buf, *data; |
4161 | int nt_type, res; | |
58caa3dc | 4162 | |
030031ee | 4163 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4164 | { |
4165 | regset ++; | |
4166 | continue; | |
4167 | } | |
4168 | ||
bca929d3 | 4169 | buf = xmalloc (regset->size); |
545587ee DJ |
4170 | |
4171 | /* First fill the buffer with the current register set contents, | |
4172 | in case there are any items in the kernel's regset that are | |
4173 | not in gdbserver's regcache. */ | |
1570b33e L |
4174 | |
4175 | nt_type = regset->nt_type; | |
4176 | if (nt_type) | |
4177 | { | |
4178 | iov.iov_base = buf; | |
4179 | iov.iov_len = regset->size; | |
4180 | data = (void *) &iov; | |
4181 | } | |
4182 | else | |
4183 | data = buf; | |
4184 | ||
dfb64f85 | 4185 | #ifndef __sparc__ |
f15f9948 TJB |
4186 | res = ptrace (regset->get_request, pid, |
4187 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4188 | #else |
689cc2ae | 4189 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4190 | #endif |
545587ee DJ |
4191 | |
4192 | if (res == 0) | |
4193 | { | |
4194 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4195 | regset->fill_function (regcache, buf); |
545587ee DJ |
4196 | |
4197 | /* Only now do we write the register set. */ | |
dfb64f85 | 4198 | #ifndef __sparc__ |
f15f9948 TJB |
4199 | res = ptrace (regset->set_request, pid, |
4200 | (PTRACE_ARG3_TYPE) (long) nt_type, data); | |
dfb64f85 | 4201 | #else |
1570b33e | 4202 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4203 | #endif |
545587ee DJ |
4204 | } |
4205 | ||
58caa3dc DJ |
4206 | if (res < 0) |
4207 | { | |
4208 | if (errno == EIO) | |
4209 | { | |
52fa2412 | 4210 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4211 | this process mode. */ |
030031ee | 4212 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4213 | free (buf); |
52fa2412 | 4214 | continue; |
58caa3dc | 4215 | } |
3221518c UW |
4216 | else if (errno == ESRCH) |
4217 | { | |
1b3f6016 PA |
4218 | /* At this point, ESRCH should mean the process is |
4219 | already gone, in which case we simply ignore attempts | |
4220 | to change its registers. See also the related | |
4221 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4222 | free (buf); |
3221518c UW |
4223 | return 0; |
4224 | } | |
58caa3dc DJ |
4225 | else |
4226 | { | |
ce3a066d | 4227 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4228 | } |
4229 | } | |
e9d25b98 DJ |
4230 | else if (regset->type == GENERAL_REGS) |
4231 | saw_general_regs = 1; | |
58caa3dc | 4232 | regset ++; |
09ec9b38 | 4233 | free (buf); |
58caa3dc | 4234 | } |
e9d25b98 DJ |
4235 | if (saw_general_regs) |
4236 | return 0; | |
4237 | else | |
4238 | return 1; | |
58caa3dc DJ |
4239 | } |
4240 | ||
1faeff08 | 4241 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4242 | |
1faeff08 | 4243 | #define use_linux_regsets 0 |
3aee8918 PA |
4244 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4245 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4246 | |
58caa3dc | 4247 | #endif |
1faeff08 MR |
4248 | |
4249 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4250 | calls or 0 if it has to be transferred individually. */ | |
4251 | ||
4252 | static int | |
3aee8918 | 4253 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4254 | { |
4255 | unsigned char mask = 1 << (regno % 8); | |
4256 | size_t index = regno / 8; | |
4257 | ||
4258 | return (use_linux_regsets | |
3aee8918 PA |
4259 | && (regs_info->regset_bitmap == NULL |
4260 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4261 | } |
4262 | ||
58caa3dc | 4263 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4264 | |
4265 | int | |
3aee8918 | 4266 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4267 | { |
4268 | int addr; | |
4269 | ||
3aee8918 | 4270 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4271 | error ("Invalid register number %d.", regnum); |
4272 | ||
3aee8918 | 4273 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4274 | |
4275 | return addr; | |
4276 | } | |
4277 | ||
4278 | /* Fetch one register. */ | |
4279 | static void | |
3aee8918 PA |
4280 | fetch_register (const struct usrregs_info *usrregs, |
4281 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4282 | { |
4283 | CORE_ADDR regaddr; | |
4284 | int i, size; | |
4285 | char *buf; | |
4286 | int pid; | |
4287 | ||
3aee8918 | 4288 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4289 | return; |
4290 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4291 | return; | |
4292 | ||
3aee8918 | 4293 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4294 | if (regaddr == -1) |
4295 | return; | |
4296 | ||
3aee8918 PA |
4297 | size = ((register_size (regcache->tdesc, regno) |
4298 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4299 | & -sizeof (PTRACE_XFER_TYPE)); |
4300 | buf = alloca (size); | |
4301 | ||
4302 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4303 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4304 | { | |
4305 | errno = 0; | |
4306 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4307 | ptrace (PTRACE_PEEKUSER, pid, | |
4308 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4309 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
56f7af9c | 4310 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, (PTRACE_ARG4_TYPE) 0); |
1faeff08 MR |
4311 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4312 | if (errno != 0) | |
4313 | error ("reading register %d: %s", regno, strerror (errno)); | |
4314 | } | |
4315 | ||
4316 | if (the_low_target.supply_ptrace_register) | |
4317 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4318 | else | |
4319 | supply_register (regcache, regno, buf); | |
4320 | } | |
4321 | ||
4322 | /* Store one register. */ | |
4323 | static void | |
3aee8918 PA |
4324 | store_register (const struct usrregs_info *usrregs, |
4325 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4326 | { |
4327 | CORE_ADDR regaddr; | |
4328 | int i, size; | |
4329 | char *buf; | |
4330 | int pid; | |
4331 | ||
3aee8918 | 4332 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4333 | return; |
4334 | if ((*the_low_target.cannot_store_register) (regno)) | |
4335 | return; | |
4336 | ||
3aee8918 | 4337 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4338 | if (regaddr == -1) |
4339 | return; | |
4340 | ||
3aee8918 PA |
4341 | size = ((register_size (regcache->tdesc, regno) |
4342 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4343 | & -sizeof (PTRACE_XFER_TYPE)); |
4344 | buf = alloca (size); | |
4345 | memset (buf, 0, size); | |
4346 | ||
4347 | if (the_low_target.collect_ptrace_register) | |
4348 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4349 | else | |
4350 | collect_register (regcache, regno, buf); | |
4351 | ||
4352 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4353 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4354 | { | |
4355 | errno = 0; | |
4356 | ptrace (PTRACE_POKEUSER, pid, | |
4357 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4358 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4359 | (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, | |
4360 | (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i)); | |
4361 | if (errno != 0) | |
4362 | { | |
4363 | /* At this point, ESRCH should mean the process is | |
4364 | already gone, in which case we simply ignore attempts | |
4365 | to change its registers. See also the related | |
4366 | comment in linux_resume_one_lwp. */ | |
4367 | if (errno == ESRCH) | |
4368 | return; | |
4369 | ||
4370 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4371 | error ("writing register %d: %s", regno, strerror (errno)); | |
4372 | } | |
4373 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4374 | } | |
4375 | } | |
4376 | ||
4377 | /* Fetch all registers, or just one, from the child process. | |
4378 | If REGNO is -1, do this for all registers, skipping any that are | |
4379 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4380 | unless ALL is non-zero. | |
4381 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4382 | static void | |
3aee8918 PA |
4383 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4384 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4385 | { |
3aee8918 PA |
4386 | struct usrregs_info *usr = regs_info->usrregs; |
4387 | ||
1faeff08 MR |
4388 | if (regno == -1) |
4389 | { | |
3aee8918 PA |
4390 | for (regno = 0; regno < usr->num_regs; regno++) |
4391 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4392 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4393 | } |
4394 | else | |
3aee8918 | 4395 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4396 | } |
4397 | ||
4398 | /* Store our register values back into the inferior. | |
4399 | If REGNO is -1, do this for all registers, skipping any that are | |
4400 | assumed to have been saved by regsets_store_inferior_registers, | |
4401 | unless ALL is non-zero. | |
4402 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4403 | static void | |
3aee8918 PA |
4404 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4405 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4406 | { |
3aee8918 PA |
4407 | struct usrregs_info *usr = regs_info->usrregs; |
4408 | ||
1faeff08 MR |
4409 | if (regno == -1) |
4410 | { | |
3aee8918 PA |
4411 | for (regno = 0; regno < usr->num_regs; regno++) |
4412 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4413 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4414 | } |
4415 | else | |
3aee8918 | 4416 | store_register (usr, regcache, regno); |
1faeff08 MR |
4417 | } |
4418 | ||
4419 | #else /* !HAVE_LINUX_USRREGS */ | |
4420 | ||
3aee8918 PA |
4421 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4422 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4423 | |
58caa3dc | 4424 | #endif |
1faeff08 MR |
4425 | |
4426 | ||
4427 | void | |
4428 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4429 | { | |
4430 | int use_regsets; | |
4431 | int all = 0; | |
3aee8918 | 4432 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4433 | |
4434 | if (regno == -1) | |
4435 | { | |
3aee8918 PA |
4436 | if (the_low_target.fetch_register != NULL |
4437 | && regs_info->usrregs != NULL) | |
4438 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4439 | (*the_low_target.fetch_register) (regcache, regno); |
4440 | ||
3aee8918 PA |
4441 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4442 | if (regs_info->usrregs != NULL) | |
4443 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4444 | } |
4445 | else | |
4446 | { | |
c14dfd32 PA |
4447 | if (the_low_target.fetch_register != NULL |
4448 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4449 | return; | |
4450 | ||
3aee8918 | 4451 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4452 | if (use_regsets) |
3aee8918 PA |
4453 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4454 | regcache); | |
4455 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4456 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4457 | } |
58caa3dc DJ |
4458 | } |
4459 | ||
4460 | void | |
442ea881 | 4461 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4462 | { |
1faeff08 MR |
4463 | int use_regsets; |
4464 | int all = 0; | |
3aee8918 | 4465 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4466 | |
4467 | if (regno == -1) | |
4468 | { | |
3aee8918 PA |
4469 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4470 | regcache); | |
4471 | if (regs_info->usrregs != NULL) | |
4472 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
4473 | } |
4474 | else | |
4475 | { | |
3aee8918 | 4476 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4477 | if (use_regsets) |
3aee8918 PA |
4478 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4479 | regcache); | |
4480 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4481 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4482 | } |
58caa3dc DJ |
4483 | } |
4484 | ||
da6d8c04 | 4485 | |
da6d8c04 DJ |
4486 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4487 | to debugger memory starting at MYADDR. */ | |
4488 | ||
c3e735a6 | 4489 | static int |
f450004a | 4490 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4491 | { |
4934b29e MR |
4492 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
4493 | register PTRACE_XFER_TYPE *buffer; | |
4494 | register CORE_ADDR addr; | |
4495 | register int count; | |
4496 | char filename[64]; | |
da6d8c04 | 4497 | register int i; |
4934b29e | 4498 | int ret; |
fd462a61 | 4499 | int fd; |
fd462a61 DJ |
4500 | |
4501 | /* Try using /proc. Don't bother for one word. */ | |
4502 | if (len >= 3 * sizeof (long)) | |
4503 | { | |
4934b29e MR |
4504 | int bytes; |
4505 | ||
fd462a61 DJ |
4506 | /* We could keep this file open and cache it - possibly one per |
4507 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4508 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4509 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4510 | if (fd == -1) | |
4511 | goto no_proc; | |
4512 | ||
4513 | /* If pread64 is available, use it. It's faster if the kernel | |
4514 | supports it (only one syscall), and it's 64-bit safe even on | |
4515 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4516 | application). */ | |
4517 | #ifdef HAVE_PREAD64 | |
4934b29e | 4518 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4519 | #else |
4934b29e MR |
4520 | bytes = -1; |
4521 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4522 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4523 | #endif |
fd462a61 DJ |
4524 | |
4525 | close (fd); | |
4934b29e MR |
4526 | if (bytes == len) |
4527 | return 0; | |
4528 | ||
4529 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4530 | if (bytes > 0) | |
4531 | { | |
4532 | memaddr += bytes; | |
4533 | myaddr += bytes; | |
4534 | len -= bytes; | |
4535 | } | |
fd462a61 | 4536 | } |
da6d8c04 | 4537 | |
fd462a61 | 4538 | no_proc: |
4934b29e MR |
4539 | /* Round starting address down to longword boundary. */ |
4540 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4541 | /* Round ending address up; get number of longwords that makes. */ | |
4542 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4543 | / sizeof (PTRACE_XFER_TYPE)); | |
4544 | /* Allocate buffer of that many longwords. */ | |
4545 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4546 | ||
da6d8c04 | 4547 | /* Read all the longwords */ |
4934b29e | 4548 | errno = 0; |
da6d8c04 DJ |
4549 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4550 | { | |
14ce3065 DE |
4551 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4552 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4553 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
56f7af9c MS |
4554 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, |
4555 | (PTRACE_ARG4_TYPE) 0); | |
c3e735a6 | 4556 | if (errno) |
4934b29e | 4557 | break; |
da6d8c04 | 4558 | } |
4934b29e | 4559 | ret = errno; |
da6d8c04 DJ |
4560 | |
4561 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4562 | if (i > 0) |
4563 | { | |
4564 | i *= sizeof (PTRACE_XFER_TYPE); | |
4565 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4566 | memcpy (myaddr, | |
4567 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4568 | i < len ? i : len); | |
4569 | } | |
c3e735a6 | 4570 | |
4934b29e | 4571 | return ret; |
da6d8c04 DJ |
4572 | } |
4573 | ||
93ae6fdc PA |
4574 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4575 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4576 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4577 | |
ce3a066d | 4578 | static int |
f450004a | 4579 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4580 | { |
4581 | register int i; | |
4582 | /* Round starting address down to longword boundary. */ | |
4583 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4584 | /* Round ending address up; get number of longwords that makes. */ | |
4585 | register int count | |
493e2a69 MS |
4586 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4587 | / sizeof (PTRACE_XFER_TYPE); | |
4588 | ||
da6d8c04 | 4589 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4590 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4591 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4592 | ||
95954743 | 4593 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4594 | |
f0ae6fc3 PA |
4595 | if (len == 0) |
4596 | { | |
4597 | /* Zero length write always succeeds. */ | |
4598 | return 0; | |
4599 | } | |
4600 | ||
0d62e5e8 DJ |
4601 | if (debug_threads) |
4602 | { | |
58d6951d DJ |
4603 | /* Dump up to four bytes. */ |
4604 | unsigned int val = * (unsigned int *) myaddr; | |
4605 | if (len == 1) | |
4606 | val = val & 0xff; | |
4607 | else if (len == 2) | |
4608 | val = val & 0xffff; | |
4609 | else if (len == 3) | |
4610 | val = val & 0xffffff; | |
4611 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4612 | val, (long)memaddr); | |
0d62e5e8 DJ |
4613 | } |
4614 | ||
da6d8c04 DJ |
4615 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4616 | ||
93ae6fdc | 4617 | errno = 0; |
14ce3065 DE |
4618 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4619 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4620 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
56f7af9c MS |
4621 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, |
4622 | (PTRACE_ARG4_TYPE) 0); | |
93ae6fdc PA |
4623 | if (errno) |
4624 | return errno; | |
da6d8c04 DJ |
4625 | |
4626 | if (count > 1) | |
4627 | { | |
93ae6fdc | 4628 | errno = 0; |
da6d8c04 | 4629 | buffer[count - 1] |
95954743 | 4630 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4631 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4632 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4633 | (PTRACE_ARG3_TYPE) (uintptr_t) (addr + (count - 1) | |
4634 | * sizeof (PTRACE_XFER_TYPE)), | |
56f7af9c | 4635 | (PTRACE_ARG4_TYPE) 0); |
93ae6fdc PA |
4636 | if (errno) |
4637 | return errno; | |
da6d8c04 DJ |
4638 | } |
4639 | ||
93ae6fdc | 4640 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4641 | |
493e2a69 MS |
4642 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4643 | myaddr, len); | |
da6d8c04 DJ |
4644 | |
4645 | /* Write the entire buffer. */ | |
4646 | ||
4647 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4648 | { | |
4649 | errno = 0; | |
14ce3065 DE |
4650 | ptrace (PTRACE_POKETEXT, pid, |
4651 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4652 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4653 | (PTRACE_ARG3_TYPE) (uintptr_t) addr, | |
4654 | (PTRACE_ARG4_TYPE) buffer[i]); | |
da6d8c04 DJ |
4655 | if (errno) |
4656 | return errno; | |
4657 | } | |
4658 | ||
4659 | return 0; | |
4660 | } | |
2f2893d9 | 4661 | |
6076632b | 4662 | /* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */ |
24a09b5f DJ |
4663 | static int linux_supports_tracefork_flag; |
4664 | ||
1e7fc18c PA |
4665 | static void |
4666 | linux_enable_event_reporting (int pid) | |
4667 | { | |
4668 | if (!linux_supports_tracefork_flag) | |
4669 | return; | |
4670 | ||
56f7af9c MS |
4671 | ptrace (PTRACE_SETOPTIONS, pid, (PTRACE_ARG3_TYPE) 0, |
4672 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE); | |
1e7fc18c PA |
4673 | } |
4674 | ||
51c2684e | 4675 | /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
24a09b5f | 4676 | |
51c2684e DJ |
4677 | static int |
4678 | linux_tracefork_grandchild (void *arg) | |
4679 | { | |
4680 | _exit (0); | |
4681 | } | |
4682 | ||
7407e2de AS |
4683 | #define STACK_SIZE 4096 |
4684 | ||
51c2684e DJ |
4685 | static int |
4686 | linux_tracefork_child (void *arg) | |
24a09b5f | 4687 | { |
56f7af9c | 4688 | ptrace (PTRACE_TRACEME, 0, (PTRACE_ARG3_TYPE) 0, (PTRACE_ARG4_TYPE) 0); |
24a09b5f | 4689 | kill (getpid (), SIGSTOP); |
e4b7f41c JK |
4690 | |
4691 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) | |
4692 | ||
4693 | if (fork () == 0) | |
4694 | linux_tracefork_grandchild (NULL); | |
4695 | ||
4696 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4697 | ||
7407e2de AS |
4698 | #ifdef __ia64__ |
4699 | __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, | |
4700 | CLONE_VM | SIGCHLD, NULL); | |
4701 | #else | |
a1f2ce7d | 4702 | clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE, |
7407e2de AS |
4703 | CLONE_VM | SIGCHLD, NULL); |
4704 | #endif | |
e4b7f41c JK |
4705 | |
4706 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4707 | ||
24a09b5f DJ |
4708 | _exit (0); |
4709 | } | |
4710 | ||
24a09b5f DJ |
4711 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make |
4712 | sure that we can enable the option, and that it had the desired | |
4713 | effect. */ | |
4714 | ||
4715 | static void | |
4716 | linux_test_for_tracefork (void) | |
4717 | { | |
4718 | int child_pid, ret, status; | |
4719 | long second_pid; | |
e4b7f41c | 4720 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
bca929d3 | 4721 | char *stack = xmalloc (STACK_SIZE * 4); |
e4b7f41c | 4722 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4723 | |
4724 | linux_supports_tracefork_flag = 0; | |
4725 | ||
e4b7f41c JK |
4726 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
4727 | ||
4728 | child_pid = fork (); | |
4729 | if (child_pid == 0) | |
4730 | linux_tracefork_child (NULL); | |
4731 | ||
4732 | #else /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4733 | ||
51c2684e | 4734 | /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
7407e2de AS |
4735 | #ifdef __ia64__ |
4736 | child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, | |
4737 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c | 4738 | #else /* !__ia64__ */ |
7407e2de AS |
4739 | child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
4740 | CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); | |
e4b7f41c JK |
4741 | #endif /* !__ia64__ */ |
4742 | ||
4743 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ | |
4744 | ||
24a09b5f | 4745 | if (child_pid == -1) |
51c2684e | 4746 | perror_with_name ("clone"); |
24a09b5f DJ |
4747 | |
4748 | ret = my_waitpid (child_pid, &status, 0); | |
4749 | if (ret == -1) | |
4750 | perror_with_name ("waitpid"); | |
4751 | else if (ret != child_pid) | |
4752 | error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); | |
4753 | if (! WIFSTOPPED (status)) | |
4754 | error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); | |
4755 | ||
56f7af9c | 4756 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, (PTRACE_ARG3_TYPE) 0, |
14ce3065 | 4757 | (PTRACE_ARG4_TYPE) PTRACE_O_TRACEFORK); |
24a09b5f DJ |
4758 | if (ret != 0) |
4759 | { | |
56f7af9c MS |
4760 | ret = ptrace (PTRACE_KILL, child_pid, (PTRACE_ARG3_TYPE) 0, |
4761 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4762 | if (ret != 0) |
4763 | { | |
4764 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4765 | return; | |
4766 | } | |
4767 | ||
4768 | ret = my_waitpid (child_pid, &status, 0); | |
4769 | if (ret != child_pid) | |
4770 | warning ("linux_test_for_tracefork: failed to wait for killed child"); | |
4771 | else if (!WIFSIGNALED (status)) | |
4772 | warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " | |
4773 | "killed child", status); | |
4774 | ||
4775 | return; | |
4776 | } | |
4777 | ||
56f7af9c MS |
4778 | ret = ptrace (PTRACE_CONT, child_pid, (PTRACE_ARG3_TYPE) 0, |
4779 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4780 | if (ret != 0) |
4781 | warning ("linux_test_for_tracefork: failed to resume child"); | |
4782 | ||
4783 | ret = my_waitpid (child_pid, &status, 0); | |
4784 | ||
4785 | if (ret == child_pid && WIFSTOPPED (status) | |
4786 | && status >> 16 == PTRACE_EVENT_FORK) | |
4787 | { | |
4788 | second_pid = 0; | |
56f7af9c MS |
4789 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, (PTRACE_ARG3_TYPE) 0, |
4790 | &second_pid); | |
24a09b5f DJ |
4791 | if (ret == 0 && second_pid != 0) |
4792 | { | |
4793 | int second_status; | |
4794 | ||
4795 | linux_supports_tracefork_flag = 1; | |
4796 | my_waitpid (second_pid, &second_status, 0); | |
56f7af9c MS |
4797 | ret = ptrace (PTRACE_KILL, second_pid, (PTRACE_ARG3_TYPE) 0, |
4798 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4799 | if (ret != 0) |
4800 | warning ("linux_test_for_tracefork: failed to kill second child"); | |
4801 | my_waitpid (second_pid, &status, 0); | |
4802 | } | |
4803 | } | |
4804 | else | |
4805 | warning ("linux_test_for_tracefork: unexpected result from waitpid " | |
4806 | "(%d, status 0x%x)", ret, status); | |
4807 | ||
4808 | do | |
4809 | { | |
56f7af9c MS |
4810 | ret = ptrace (PTRACE_KILL, child_pid, (PTRACE_ARG3_TYPE) 0, |
4811 | (PTRACE_ARG4_TYPE) 0); | |
24a09b5f DJ |
4812 | if (ret != 0) |
4813 | warning ("linux_test_for_tracefork: failed to kill child"); | |
4814 | my_waitpid (child_pid, &status, 0); | |
4815 | } | |
4816 | while (WIFSTOPPED (status)); | |
51c2684e | 4817 | |
e4b7f41c | 4818 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
51c2684e | 4819 | free (stack); |
e4b7f41c | 4820 | #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */ |
24a09b5f DJ |
4821 | } |
4822 | ||
4823 | ||
2f2893d9 DJ |
4824 | static void |
4825 | linux_look_up_symbols (void) | |
4826 | { | |
0d62e5e8 | 4827 | #ifdef USE_THREAD_DB |
95954743 PA |
4828 | struct process_info *proc = current_process (); |
4829 | ||
cdbfd419 | 4830 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4831 | return; |
4832 | ||
6076632b DE |
4833 | /* If the kernel supports tracing forks then it also supports tracing |
4834 | clones, and then we don't need to use the magic thread event breakpoint | |
4835 | to learn about threads. */ | |
cdbfd419 | 4836 | thread_db_init (!linux_supports_tracefork_flag); |
0d62e5e8 DJ |
4837 | #endif |
4838 | } | |
4839 | ||
e5379b03 | 4840 | static void |
ef57601b | 4841 | linux_request_interrupt (void) |
e5379b03 | 4842 | { |
a1928bad | 4843 | extern unsigned long signal_pid; |
e5379b03 | 4844 | |
95954743 PA |
4845 | if (!ptid_equal (cont_thread, null_ptid) |
4846 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4847 | { |
54a0b537 | 4848 | struct lwp_info *lwp; |
bd99dc85 | 4849 | int lwpid; |
e5379b03 | 4850 | |
54a0b537 | 4851 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4852 | lwpid = lwpid_of (lwp); |
4853 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4854 | } |
4855 | else | |
ef57601b | 4856 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4857 | } |
4858 | ||
aa691b87 RM |
4859 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4860 | to debugger memory starting at MYADDR. */ | |
4861 | ||
4862 | static int | |
f450004a | 4863 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4864 | { |
4865 | char filename[PATH_MAX]; | |
4866 | int fd, n; | |
95954743 | 4867 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4868 | |
6cebaf6e | 4869 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4870 | |
4871 | fd = open (filename, O_RDONLY); | |
4872 | if (fd < 0) | |
4873 | return -1; | |
4874 | ||
4875 | if (offset != (CORE_ADDR) 0 | |
4876 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4877 | n = -1; | |
4878 | else | |
4879 | n = read (fd, myaddr, len); | |
4880 | ||
4881 | close (fd); | |
4882 | ||
4883 | return n; | |
4884 | } | |
4885 | ||
d993e290 PA |
4886 | /* These breakpoint and watchpoint related wrapper functions simply |
4887 | pass on the function call if the target has registered a | |
4888 | corresponding function. */ | |
e013ee27 OF |
4889 | |
4890 | static int | |
d993e290 | 4891 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4892 | { |
d993e290 PA |
4893 | if (the_low_target.insert_point != NULL) |
4894 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4895 | else |
4896 | /* Unsupported (see target.h). */ | |
4897 | return 1; | |
4898 | } | |
4899 | ||
4900 | static int | |
d993e290 | 4901 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4902 | { |
d993e290 PA |
4903 | if (the_low_target.remove_point != NULL) |
4904 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4905 | else |
4906 | /* Unsupported (see target.h). */ | |
4907 | return 1; | |
4908 | } | |
4909 | ||
4910 | static int | |
4911 | linux_stopped_by_watchpoint (void) | |
4912 | { | |
c3adc08c PA |
4913 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4914 | ||
4915 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4916 | } |
4917 | ||
4918 | static CORE_ADDR | |
4919 | linux_stopped_data_address (void) | |
4920 | { | |
c3adc08c PA |
4921 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4922 | ||
4923 | return lwp->stopped_data_address; | |
e013ee27 OF |
4924 | } |
4925 | ||
db0dfaa0 LM |
4926 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
4927 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
4928 | && defined(PT_TEXT_END_ADDR) | |
4929 | ||
4930 | /* This is only used for targets that define PT_TEXT_ADDR, | |
4931 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
4932 | the target has different ways of acquiring this information, like | |
4933 | loadmaps. */ | |
52fb6437 NS |
4934 | |
4935 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4936 | to tell gdb about. */ | |
4937 | ||
4938 | static int | |
4939 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4940 | { | |
52fb6437 | 4941 | unsigned long text, text_end, data; |
bd99dc85 | 4942 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4943 | |
4944 | errno = 0; | |
4945 | ||
56f7af9c MS |
4946 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) PT_TEXT_ADDR, |
4947 | (PTRACE_ARG4_TYPE) 0); | |
4948 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) PT_TEXT_END_ADDR, | |
4949 | (PTRACE_ARG4_TYPE) 0); | |
4950 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) PT_DATA_ADDR, | |
4951 | (PTRACE_ARG4_TYPE) 0); | |
52fb6437 NS |
4952 | |
4953 | if (errno == 0) | |
4954 | { | |
4955 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4956 | used by gdb) are relative to the beginning of the program, |
4957 | with the data segment immediately following the text segment. | |
4958 | However, the actual runtime layout in memory may put the data | |
4959 | somewhere else, so when we send gdb a data base-address, we | |
4960 | use the real data base address and subtract the compile-time | |
4961 | data base-address from it (which is just the length of the | |
4962 | text segment). BSS immediately follows data in both | |
4963 | cases. */ | |
52fb6437 NS |
4964 | *text_p = text; |
4965 | *data_p = data - (text_end - text); | |
1b3f6016 | 4966 | |
52fb6437 NS |
4967 | return 1; |
4968 | } | |
52fb6437 NS |
4969 | return 0; |
4970 | } | |
4971 | #endif | |
4972 | ||
07e059b5 VP |
4973 | static int |
4974 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4975 | unsigned char *readbuf, unsigned const char *writebuf, |
4976 | CORE_ADDR offset, int len) | |
07e059b5 | 4977 | { |
d26e3629 | 4978 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4979 | } |
4980 | ||
d0722149 DE |
4981 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4982 | layout of the inferiors' architecture. */ | |
4983 | ||
4984 | static void | |
a5362b9a | 4985 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4986 | { |
4987 | int done = 0; | |
4988 | ||
4989 | if (the_low_target.siginfo_fixup != NULL) | |
4990 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4991 | ||
4992 | /* If there was no callback, or the callback didn't do anything, | |
4993 | then just do a straight memcpy. */ | |
4994 | if (!done) | |
4995 | { | |
4996 | if (direction == 1) | |
a5362b9a | 4997 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4998 | else |
a5362b9a | 4999 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5000 | } |
5001 | } | |
5002 | ||
4aa995e1 PA |
5003 | static int |
5004 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5005 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5006 | { | |
d0722149 | 5007 | int pid; |
a5362b9a TS |
5008 | siginfo_t siginfo; |
5009 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
5010 | |
5011 | if (current_inferior == NULL) | |
5012 | return -1; | |
5013 | ||
bd99dc85 | 5014 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
5015 | |
5016 | if (debug_threads) | |
d0722149 | 5017 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
5018 | readbuf != NULL ? "Reading" : "Writing", |
5019 | pid); | |
5020 | ||
0adea5f7 | 5021 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5022 | return -1; |
5023 | ||
56f7af9c | 5024 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_ARG3_TYPE) 0, &siginfo) != 0) |
4aa995e1 PA |
5025 | return -1; |
5026 | ||
d0722149 DE |
5027 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5028 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5029 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5030 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5031 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5032 | ||
4aa995e1 PA |
5033 | if (offset + len > sizeof (siginfo)) |
5034 | len = sizeof (siginfo) - offset; | |
5035 | ||
5036 | if (readbuf != NULL) | |
d0722149 | 5037 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5038 | else |
5039 | { | |
d0722149 DE |
5040 | memcpy (inf_siginfo + offset, writebuf, len); |
5041 | ||
5042 | /* Convert back to ptrace layout before flushing it out. */ | |
5043 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5044 | ||
56f7af9c | 5045 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_ARG3_TYPE) 0, &siginfo) != 0) |
4aa995e1 PA |
5046 | return -1; |
5047 | } | |
5048 | ||
5049 | return len; | |
5050 | } | |
5051 | ||
bd99dc85 PA |
5052 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5053 | so we notice when children change state; as the handler for the | |
5054 | sigsuspend in my_waitpid. */ | |
5055 | ||
5056 | static void | |
5057 | sigchld_handler (int signo) | |
5058 | { | |
5059 | int old_errno = errno; | |
5060 | ||
5061 | if (debug_threads) | |
e581f2b4 PA |
5062 | { |
5063 | do | |
5064 | { | |
5065 | /* fprintf is not async-signal-safe, so call write | |
5066 | directly. */ | |
5067 | if (write (2, "sigchld_handler\n", | |
5068 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5069 | break; /* just ignore */ | |
5070 | } while (0); | |
5071 | } | |
bd99dc85 PA |
5072 | |
5073 | if (target_is_async_p ()) | |
5074 | async_file_mark (); /* trigger a linux_wait */ | |
5075 | ||
5076 | errno = old_errno; | |
5077 | } | |
5078 | ||
5079 | static int | |
5080 | linux_supports_non_stop (void) | |
5081 | { | |
5082 | return 1; | |
5083 | } | |
5084 | ||
5085 | static int | |
5086 | linux_async (int enable) | |
5087 | { | |
5088 | int previous = (linux_event_pipe[0] != -1); | |
5089 | ||
8336d594 PA |
5090 | if (debug_threads) |
5091 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
5092 | enable, previous); | |
5093 | ||
bd99dc85 PA |
5094 | if (previous != enable) |
5095 | { | |
5096 | sigset_t mask; | |
5097 | sigemptyset (&mask); | |
5098 | sigaddset (&mask, SIGCHLD); | |
5099 | ||
5100 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5101 | ||
5102 | if (enable) | |
5103 | { | |
5104 | if (pipe (linux_event_pipe) == -1) | |
5105 | fatal ("creating event pipe failed."); | |
5106 | ||
5107 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5108 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5109 | ||
5110 | /* Register the event loop handler. */ | |
5111 | add_file_handler (linux_event_pipe[0], | |
5112 | handle_target_event, NULL); | |
5113 | ||
5114 | /* Always trigger a linux_wait. */ | |
5115 | async_file_mark (); | |
5116 | } | |
5117 | else | |
5118 | { | |
5119 | delete_file_handler (linux_event_pipe[0]); | |
5120 | ||
5121 | close (linux_event_pipe[0]); | |
5122 | close (linux_event_pipe[1]); | |
5123 | linux_event_pipe[0] = -1; | |
5124 | linux_event_pipe[1] = -1; | |
5125 | } | |
5126 | ||
5127 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5128 | } | |
5129 | ||
5130 | return previous; | |
5131 | } | |
5132 | ||
5133 | static int | |
5134 | linux_start_non_stop (int nonstop) | |
5135 | { | |
5136 | /* Register or unregister from event-loop accordingly. */ | |
5137 | linux_async (nonstop); | |
5138 | return 0; | |
5139 | } | |
5140 | ||
cf8fd78b PA |
5141 | static int |
5142 | linux_supports_multi_process (void) | |
5143 | { | |
5144 | return 1; | |
5145 | } | |
5146 | ||
03583c20 UW |
5147 | static int |
5148 | linux_supports_disable_randomization (void) | |
5149 | { | |
5150 | #ifdef HAVE_PERSONALITY | |
5151 | return 1; | |
5152 | #else | |
5153 | return 0; | |
5154 | #endif | |
5155 | } | |
efcbbd14 | 5156 | |
d1feda86 YQ |
5157 | static int |
5158 | linux_supports_agent (void) | |
5159 | { | |
5160 | return 1; | |
5161 | } | |
5162 | ||
c2d6af84 PA |
5163 | static int |
5164 | linux_supports_range_stepping (void) | |
5165 | { | |
5166 | if (*the_low_target.supports_range_stepping == NULL) | |
5167 | return 0; | |
5168 | ||
5169 | return (*the_low_target.supports_range_stepping) (); | |
5170 | } | |
5171 | ||
efcbbd14 UW |
5172 | /* Enumerate spufs IDs for process PID. */ |
5173 | static int | |
5174 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5175 | { | |
5176 | int pos = 0; | |
5177 | int written = 0; | |
5178 | char path[128]; | |
5179 | DIR *dir; | |
5180 | struct dirent *entry; | |
5181 | ||
5182 | sprintf (path, "/proc/%ld/fd", pid); | |
5183 | dir = opendir (path); | |
5184 | if (!dir) | |
5185 | return -1; | |
5186 | ||
5187 | rewinddir (dir); | |
5188 | while ((entry = readdir (dir)) != NULL) | |
5189 | { | |
5190 | struct stat st; | |
5191 | struct statfs stfs; | |
5192 | int fd; | |
5193 | ||
5194 | fd = atoi (entry->d_name); | |
5195 | if (!fd) | |
5196 | continue; | |
5197 | ||
5198 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5199 | if (stat (path, &st) != 0) | |
5200 | continue; | |
5201 | if (!S_ISDIR (st.st_mode)) | |
5202 | continue; | |
5203 | ||
5204 | if (statfs (path, &stfs) != 0) | |
5205 | continue; | |
5206 | if (stfs.f_type != SPUFS_MAGIC) | |
5207 | continue; | |
5208 | ||
5209 | if (pos >= offset && pos + 4 <= offset + len) | |
5210 | { | |
5211 | *(unsigned int *)(buf + pos - offset) = fd; | |
5212 | written += 4; | |
5213 | } | |
5214 | pos += 4; | |
5215 | } | |
5216 | ||
5217 | closedir (dir); | |
5218 | return written; | |
5219 | } | |
5220 | ||
5221 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5222 | object type, using the /proc file system. */ | |
5223 | static int | |
5224 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5225 | unsigned const char *writebuf, | |
5226 | CORE_ADDR offset, int len) | |
5227 | { | |
5228 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5229 | char buf[128]; | |
5230 | int fd = 0; | |
5231 | int ret = 0; | |
5232 | ||
5233 | if (!writebuf && !readbuf) | |
5234 | return -1; | |
5235 | ||
5236 | if (!*annex) | |
5237 | { | |
5238 | if (!readbuf) | |
5239 | return -1; | |
5240 | else | |
5241 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5242 | } | |
5243 | ||
5244 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5245 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5246 | if (fd <= 0) | |
5247 | return -1; | |
5248 | ||
5249 | if (offset != 0 | |
5250 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5251 | { | |
5252 | close (fd); | |
5253 | return 0; | |
5254 | } | |
5255 | ||
5256 | if (writebuf) | |
5257 | ret = write (fd, writebuf, (size_t) len); | |
5258 | else | |
5259 | ret = read (fd, readbuf, (size_t) len); | |
5260 | ||
5261 | close (fd); | |
5262 | return ret; | |
5263 | } | |
5264 | ||
723b724b | 5265 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5266 | struct target_loadseg |
5267 | { | |
5268 | /* Core address to which the segment is mapped. */ | |
5269 | Elf32_Addr addr; | |
5270 | /* VMA recorded in the program header. */ | |
5271 | Elf32_Addr p_vaddr; | |
5272 | /* Size of this segment in memory. */ | |
5273 | Elf32_Word p_memsz; | |
5274 | }; | |
5275 | ||
723b724b | 5276 | # if defined PT_GETDSBT |
78d85199 YQ |
5277 | struct target_loadmap |
5278 | { | |
5279 | /* Protocol version number, must be zero. */ | |
5280 | Elf32_Word version; | |
5281 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5282 | unsigned *dsbt_table; | |
5283 | unsigned dsbt_size, dsbt_index; | |
5284 | /* Number of segments in this map. */ | |
5285 | Elf32_Word nsegs; | |
5286 | /* The actual memory map. */ | |
5287 | struct target_loadseg segs[/*nsegs*/]; | |
5288 | }; | |
723b724b MF |
5289 | # define LINUX_LOADMAP PT_GETDSBT |
5290 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5291 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5292 | # else | |
5293 | struct target_loadmap | |
5294 | { | |
5295 | /* Protocol version number, must be zero. */ | |
5296 | Elf32_Half version; | |
5297 | /* Number of segments in this map. */ | |
5298 | Elf32_Half nsegs; | |
5299 | /* The actual memory map. */ | |
5300 | struct target_loadseg segs[/*nsegs*/]; | |
5301 | }; | |
5302 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5303 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5304 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5305 | # endif | |
78d85199 | 5306 | |
78d85199 YQ |
5307 | static int |
5308 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5309 | unsigned char *myaddr, unsigned int len) | |
5310 | { | |
5311 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5312 | int addr = -1; | |
5313 | struct target_loadmap *data = NULL; | |
5314 | unsigned int actual_length, copy_length; | |
5315 | ||
5316 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5317 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5318 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5319 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5320 | else |
5321 | return -1; | |
5322 | ||
723b724b | 5323 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5324 | return -1; |
5325 | ||
5326 | if (data == NULL) | |
5327 | return -1; | |
5328 | ||
5329 | actual_length = sizeof (struct target_loadmap) | |
5330 | + sizeof (struct target_loadseg) * data->nsegs; | |
5331 | ||
5332 | if (offset < 0 || offset > actual_length) | |
5333 | return -1; | |
5334 | ||
5335 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5336 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5337 | return copy_length; | |
5338 | } | |
723b724b MF |
5339 | #else |
5340 | # define linux_read_loadmap NULL | |
5341 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5342 | |
1570b33e L |
5343 | static void |
5344 | linux_process_qsupported (const char *query) | |
5345 | { | |
5346 | if (the_low_target.process_qsupported != NULL) | |
5347 | the_low_target.process_qsupported (query); | |
5348 | } | |
5349 | ||
219f2f23 PA |
5350 | static int |
5351 | linux_supports_tracepoints (void) | |
5352 | { | |
5353 | if (*the_low_target.supports_tracepoints == NULL) | |
5354 | return 0; | |
5355 | ||
5356 | return (*the_low_target.supports_tracepoints) (); | |
5357 | } | |
5358 | ||
5359 | static CORE_ADDR | |
5360 | linux_read_pc (struct regcache *regcache) | |
5361 | { | |
5362 | if (the_low_target.get_pc == NULL) | |
5363 | return 0; | |
5364 | ||
5365 | return (*the_low_target.get_pc) (regcache); | |
5366 | } | |
5367 | ||
5368 | static void | |
5369 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5370 | { | |
5371 | gdb_assert (the_low_target.set_pc != NULL); | |
5372 | ||
5373 | (*the_low_target.set_pc) (regcache, pc); | |
5374 | } | |
5375 | ||
8336d594 PA |
5376 | static int |
5377 | linux_thread_stopped (struct thread_info *thread) | |
5378 | { | |
5379 | return get_thread_lwp (thread)->stopped; | |
5380 | } | |
5381 | ||
5382 | /* This exposes stop-all-threads functionality to other modules. */ | |
5383 | ||
5384 | static void | |
7984d532 | 5385 | linux_pause_all (int freeze) |
8336d594 | 5386 | { |
7984d532 PA |
5387 | stop_all_lwps (freeze, NULL); |
5388 | } | |
5389 | ||
5390 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5391 | modules. */ | |
5392 | ||
5393 | static void | |
5394 | linux_unpause_all (int unfreeze) | |
5395 | { | |
5396 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5397 | } |
5398 | ||
90d74c30 PA |
5399 | static int |
5400 | linux_prepare_to_access_memory (void) | |
5401 | { | |
5402 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5403 | running LWP. */ | |
5404 | if (non_stop) | |
5405 | linux_pause_all (1); | |
5406 | return 0; | |
5407 | } | |
5408 | ||
5409 | static void | |
0146f85b | 5410 | linux_done_accessing_memory (void) |
90d74c30 PA |
5411 | { |
5412 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5413 | running LWP. */ | |
5414 | if (non_stop) | |
5415 | linux_unpause_all (1); | |
5416 | } | |
5417 | ||
fa593d66 PA |
5418 | static int |
5419 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5420 | CORE_ADDR collector, | |
5421 | CORE_ADDR lockaddr, | |
5422 | ULONGEST orig_size, | |
5423 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5424 | CORE_ADDR *trampoline, |
5425 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5426 | unsigned char *jjump_pad_insn, |
5427 | ULONGEST *jjump_pad_insn_size, | |
5428 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5429 | CORE_ADDR *adjusted_insn_addr_end, |
5430 | char *err) | |
fa593d66 PA |
5431 | { |
5432 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5433 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5434 | jump_entry, trampoline, trampoline_size, |
5435 | jjump_pad_insn, jjump_pad_insn_size, | |
5436 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5437 | err); | |
fa593d66 PA |
5438 | } |
5439 | ||
6a271cae PA |
5440 | static struct emit_ops * |
5441 | linux_emit_ops (void) | |
5442 | { | |
5443 | if (the_low_target.emit_ops != NULL) | |
5444 | return (*the_low_target.emit_ops) (); | |
5445 | else | |
5446 | return NULL; | |
5447 | } | |
5448 | ||
405f8e94 SS |
5449 | static int |
5450 | linux_get_min_fast_tracepoint_insn_len (void) | |
5451 | { | |
5452 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5453 | } | |
5454 | ||
2268b414 JK |
5455 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5456 | ||
5457 | static int | |
5458 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5459 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5460 | { | |
5461 | char filename[PATH_MAX]; | |
5462 | int fd; | |
5463 | const int auxv_size = is_elf64 | |
5464 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5465 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5466 | ||
5467 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5468 | ||
5469 | fd = open (filename, O_RDONLY); | |
5470 | if (fd < 0) | |
5471 | return 1; | |
5472 | ||
5473 | *phdr_memaddr = 0; | |
5474 | *num_phdr = 0; | |
5475 | while (read (fd, buf, auxv_size) == auxv_size | |
5476 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5477 | { | |
5478 | if (is_elf64) | |
5479 | { | |
5480 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5481 | ||
5482 | switch (aux->a_type) | |
5483 | { | |
5484 | case AT_PHDR: | |
5485 | *phdr_memaddr = aux->a_un.a_val; | |
5486 | break; | |
5487 | case AT_PHNUM: | |
5488 | *num_phdr = aux->a_un.a_val; | |
5489 | break; | |
5490 | } | |
5491 | } | |
5492 | else | |
5493 | { | |
5494 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5495 | ||
5496 | switch (aux->a_type) | |
5497 | { | |
5498 | case AT_PHDR: | |
5499 | *phdr_memaddr = aux->a_un.a_val; | |
5500 | break; | |
5501 | case AT_PHNUM: | |
5502 | *num_phdr = aux->a_un.a_val; | |
5503 | break; | |
5504 | } | |
5505 | } | |
5506 | } | |
5507 | ||
5508 | close (fd); | |
5509 | ||
5510 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5511 | { | |
5512 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5513 | "phdr_memaddr = %ld, phdr_num = %d", | |
5514 | (long) *phdr_memaddr, *num_phdr); | |
5515 | return 2; | |
5516 | } | |
5517 | ||
5518 | return 0; | |
5519 | } | |
5520 | ||
5521 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5522 | ||
5523 | static CORE_ADDR | |
5524 | get_dynamic (const int pid, const int is_elf64) | |
5525 | { | |
5526 | CORE_ADDR phdr_memaddr, relocation; | |
5527 | int num_phdr, i; | |
5528 | unsigned char *phdr_buf; | |
5529 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5530 | ||
5531 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5532 | return 0; | |
5533 | ||
5534 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5535 | phdr_buf = alloca (num_phdr * phdr_size); | |
5536 | ||
5537 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5538 | return 0; | |
5539 | ||
5540 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5541 | non-zero for PIE ones. */ | |
5542 | relocation = -1; | |
5543 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5544 | if (is_elf64) | |
5545 | { | |
5546 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5547 | ||
5548 | if (p->p_type == PT_PHDR) | |
5549 | relocation = phdr_memaddr - p->p_vaddr; | |
5550 | } | |
5551 | else | |
5552 | { | |
5553 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5554 | ||
5555 | if (p->p_type == PT_PHDR) | |
5556 | relocation = phdr_memaddr - p->p_vaddr; | |
5557 | } | |
5558 | ||
5559 | if (relocation == -1) | |
5560 | { | |
e237a7e2 JK |
5561 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5562 | any real world executables, including PIE executables, have always | |
5563 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5564 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5565 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5566 | ||
5567 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5568 | ||
5569 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5570 | ||
2268b414 JK |
5571 | return 0; |
5572 | } | |
5573 | ||
5574 | for (i = 0; i < num_phdr; i++) | |
5575 | { | |
5576 | if (is_elf64) | |
5577 | { | |
5578 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5579 | ||
5580 | if (p->p_type == PT_DYNAMIC) | |
5581 | return p->p_vaddr + relocation; | |
5582 | } | |
5583 | else | |
5584 | { | |
5585 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5586 | ||
5587 | if (p->p_type == PT_DYNAMIC) | |
5588 | return p->p_vaddr + relocation; | |
5589 | } | |
5590 | } | |
5591 | ||
5592 | return 0; | |
5593 | } | |
5594 | ||
5595 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5596 | can be 0 if the inferior does not yet have the library list initialized. |
5597 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5598 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5599 | |
5600 | static CORE_ADDR | |
5601 | get_r_debug (const int pid, const int is_elf64) | |
5602 | { | |
5603 | CORE_ADDR dynamic_memaddr; | |
5604 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5605 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5606 | CORE_ADDR map = -1; |
2268b414 JK |
5607 | |
5608 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5609 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5610 | return map; |
2268b414 JK |
5611 | |
5612 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5613 | { | |
5614 | if (is_elf64) | |
5615 | { | |
5616 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5617 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5618 | union |
5619 | { | |
5620 | Elf64_Xword map; | |
5621 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5622 | } | |
5623 | rld_map; | |
5624 | ||
5625 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5626 | { | |
5627 | if (linux_read_memory (dyn->d_un.d_val, | |
5628 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5629 | return rld_map.map; | |
5630 | else | |
5631 | break; | |
5632 | } | |
75f62ce7 | 5633 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5634 | |
367ba2c2 MR |
5635 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5636 | map = dyn->d_un.d_val; | |
2268b414 JK |
5637 | |
5638 | if (dyn->d_tag == DT_NULL) | |
5639 | break; | |
5640 | } | |
5641 | else | |
5642 | { | |
5643 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5644 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5645 | union |
5646 | { | |
5647 | Elf32_Word map; | |
5648 | unsigned char buf[sizeof (Elf32_Word)]; | |
5649 | } | |
5650 | rld_map; | |
5651 | ||
5652 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5653 | { | |
5654 | if (linux_read_memory (dyn->d_un.d_val, | |
5655 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5656 | return rld_map.map; | |
5657 | else | |
5658 | break; | |
5659 | } | |
75f62ce7 | 5660 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5661 | |
367ba2c2 MR |
5662 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5663 | map = dyn->d_un.d_val; | |
2268b414 JK |
5664 | |
5665 | if (dyn->d_tag == DT_NULL) | |
5666 | break; | |
5667 | } | |
5668 | ||
5669 | dynamic_memaddr += dyn_size; | |
5670 | } | |
5671 | ||
367ba2c2 | 5672 | return map; |
2268b414 JK |
5673 | } |
5674 | ||
5675 | /* Read one pointer from MEMADDR in the inferior. */ | |
5676 | ||
5677 | static int | |
5678 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5679 | { | |
485f1ee4 PA |
5680 | int ret; |
5681 | ||
5682 | /* Go through a union so this works on either big or little endian | |
5683 | hosts, when the inferior's pointer size is smaller than the size | |
5684 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5685 | same of the superior's. */ | |
5686 | union | |
5687 | { | |
5688 | CORE_ADDR core_addr; | |
5689 | unsigned int ui; | |
5690 | unsigned char uc; | |
5691 | } addr; | |
5692 | ||
5693 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5694 | if (ret == 0) | |
5695 | { | |
5696 | if (ptr_size == sizeof (CORE_ADDR)) | |
5697 | *ptr = addr.core_addr; | |
5698 | else if (ptr_size == sizeof (unsigned int)) | |
5699 | *ptr = addr.ui; | |
5700 | else | |
5701 | gdb_assert_not_reached ("unhandled pointer size"); | |
5702 | } | |
5703 | return ret; | |
2268b414 JK |
5704 | } |
5705 | ||
5706 | struct link_map_offsets | |
5707 | { | |
5708 | /* Offset and size of r_debug.r_version. */ | |
5709 | int r_version_offset; | |
5710 | ||
5711 | /* Offset and size of r_debug.r_map. */ | |
5712 | int r_map_offset; | |
5713 | ||
5714 | /* Offset to l_addr field in struct link_map. */ | |
5715 | int l_addr_offset; | |
5716 | ||
5717 | /* Offset to l_name field in struct link_map. */ | |
5718 | int l_name_offset; | |
5719 | ||
5720 | /* Offset to l_ld field in struct link_map. */ | |
5721 | int l_ld_offset; | |
5722 | ||
5723 | /* Offset to l_next field in struct link_map. */ | |
5724 | int l_next_offset; | |
5725 | ||
5726 | /* Offset to l_prev field in struct link_map. */ | |
5727 | int l_prev_offset; | |
5728 | }; | |
5729 | ||
fb723180 | 5730 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5731 | |
5732 | static int | |
5733 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5734 | unsigned const char *writebuf, | |
5735 | CORE_ADDR offset, int len) | |
5736 | { | |
5737 | char *document; | |
5738 | unsigned document_len; | |
5739 | struct process_info_private *const priv = current_process ()->private; | |
5740 | char filename[PATH_MAX]; | |
5741 | int pid, is_elf64; | |
5742 | ||
5743 | static const struct link_map_offsets lmo_32bit_offsets = | |
5744 | { | |
5745 | 0, /* r_version offset. */ | |
5746 | 4, /* r_debug.r_map offset. */ | |
5747 | 0, /* l_addr offset in link_map. */ | |
5748 | 4, /* l_name offset in link_map. */ | |
5749 | 8, /* l_ld offset in link_map. */ | |
5750 | 12, /* l_next offset in link_map. */ | |
5751 | 16 /* l_prev offset in link_map. */ | |
5752 | }; | |
5753 | ||
5754 | static const struct link_map_offsets lmo_64bit_offsets = | |
5755 | { | |
5756 | 0, /* r_version offset. */ | |
5757 | 8, /* r_debug.r_map offset. */ | |
5758 | 0, /* l_addr offset in link_map. */ | |
5759 | 8, /* l_name offset in link_map. */ | |
5760 | 16, /* l_ld offset in link_map. */ | |
5761 | 24, /* l_next offset in link_map. */ | |
5762 | 32 /* l_prev offset in link_map. */ | |
5763 | }; | |
5764 | const struct link_map_offsets *lmo; | |
214d508e | 5765 | unsigned int machine; |
b1fbec62 GB |
5766 | int ptr_size; |
5767 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
5768 | int allocated = 1024; | |
5769 | char *p; | |
5770 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
5771 | int header_done = 0; | |
2268b414 JK |
5772 | |
5773 | if (writebuf != NULL) | |
5774 | return -2; | |
5775 | if (readbuf == NULL) | |
5776 | return -1; | |
5777 | ||
5778 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5779 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
214d508e | 5780 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 5781 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 5782 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 5783 | |
b1fbec62 GB |
5784 | while (annex[0] != '\0') |
5785 | { | |
5786 | const char *sep; | |
5787 | CORE_ADDR *addrp; | |
5788 | int len; | |
2268b414 | 5789 | |
b1fbec62 GB |
5790 | sep = strchr (annex, '='); |
5791 | if (sep == NULL) | |
5792 | break; | |
0c5bf5a9 | 5793 | |
b1fbec62 GB |
5794 | len = sep - annex; |
5795 | if (len == 5 && strncmp (annex, "start", 5) == 0) | |
5796 | addrp = &lm_addr; | |
5797 | else if (len == 4 && strncmp (annex, "prev", 4) == 0) | |
5798 | addrp = &lm_prev; | |
5799 | else | |
5800 | { | |
5801 | annex = strchr (sep, ';'); | |
5802 | if (annex == NULL) | |
5803 | break; | |
5804 | annex++; | |
5805 | continue; | |
5806 | } | |
5807 | ||
5808 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 5809 | } |
b1fbec62 GB |
5810 | |
5811 | if (lm_addr == 0) | |
2268b414 | 5812 | { |
b1fbec62 GB |
5813 | int r_version = 0; |
5814 | ||
5815 | if (priv->r_debug == 0) | |
5816 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5817 | ||
5818 | /* We failed to find DT_DEBUG. Such situation will not change | |
5819 | for this inferior - do not retry it. Report it to GDB as | |
5820 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
5821 | if (priv->r_debug == (CORE_ADDR) -1) | |
5822 | return -1; | |
5823 | ||
5824 | if (priv->r_debug != 0) | |
2268b414 | 5825 | { |
b1fbec62 GB |
5826 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
5827 | (unsigned char *) &r_version, | |
5828 | sizeof (r_version)) != 0 | |
5829 | || r_version != 1) | |
5830 | { | |
5831 | warning ("unexpected r_debug version %d", r_version); | |
5832 | } | |
5833 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5834 | &lm_addr, ptr_size) != 0) | |
5835 | { | |
5836 | warning ("unable to read r_map from 0x%lx", | |
5837 | (long) priv->r_debug + lmo->r_map_offset); | |
5838 | } | |
2268b414 | 5839 | } |
b1fbec62 | 5840 | } |
2268b414 | 5841 | |
b1fbec62 GB |
5842 | document = xmalloc (allocated); |
5843 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5844 | p = document + strlen (document); | |
5845 | ||
5846 | while (lm_addr | |
5847 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
5848 | &l_name, ptr_size) == 0 | |
5849 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5850 | &l_addr, ptr_size) == 0 | |
5851 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5852 | &l_ld, ptr_size) == 0 | |
5853 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5854 | &l_prev, ptr_size) == 0 | |
5855 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5856 | &l_next, ptr_size) == 0) | |
5857 | { | |
5858 | unsigned char libname[PATH_MAX]; | |
5859 | ||
5860 | if (lm_prev != l_prev) | |
2268b414 | 5861 | { |
b1fbec62 GB |
5862 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
5863 | (long) lm_prev, (long) l_prev); | |
5864 | break; | |
2268b414 JK |
5865 | } |
5866 | ||
d878444c JK |
5867 | /* Ignore the first entry even if it has valid name as the first entry |
5868 | corresponds to the main executable. The first entry should not be | |
5869 | skipped if the dynamic loader was loaded late by a static executable | |
5870 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
5871 | executable does not have PT_DYNAMIC present and this function already | |
5872 | exited above due to failed get_r_debug. */ | |
5873 | if (lm_prev == 0) | |
2268b414 | 5874 | { |
d878444c JK |
5875 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
5876 | p = p + strlen (p); | |
5877 | } | |
5878 | else | |
5879 | { | |
5880 | /* Not checking for error because reading may stop before | |
5881 | we've got PATH_MAX worth of characters. */ | |
5882 | libname[0] = '\0'; | |
5883 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5884 | libname[sizeof (libname) - 1] = '\0'; | |
5885 | if (libname[0] != '\0') | |
2268b414 | 5886 | { |
d878444c JK |
5887 | /* 6x the size for xml_escape_text below. */ |
5888 | size_t len = 6 * strlen ((char *) libname); | |
5889 | char *name; | |
2268b414 | 5890 | |
d878444c JK |
5891 | if (!header_done) |
5892 | { | |
5893 | /* Terminate `<library-list-svr4'. */ | |
5894 | *p++ = '>'; | |
5895 | header_done = 1; | |
5896 | } | |
2268b414 | 5897 | |
d878444c JK |
5898 | while (allocated < p - document + len + 200) |
5899 | { | |
5900 | /* Expand to guarantee sufficient storage. */ | |
5901 | uintptr_t document_len = p - document; | |
2268b414 | 5902 | |
d878444c JK |
5903 | document = xrealloc (document, 2 * allocated); |
5904 | allocated *= 2; | |
5905 | p = document + document_len; | |
5906 | } | |
5907 | ||
5908 | name = xml_escape_text ((char *) libname); | |
5909 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5910 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5911 | name, (unsigned long) lm_addr, | |
5912 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5913 | free (name); | |
5914 | } | |
0afae3cf | 5915 | } |
b1fbec62 GB |
5916 | |
5917 | lm_prev = lm_addr; | |
5918 | lm_addr = l_next; | |
2268b414 JK |
5919 | } |
5920 | ||
b1fbec62 GB |
5921 | if (!header_done) |
5922 | { | |
5923 | /* Empty list; terminate `<library-list-svr4'. */ | |
5924 | strcpy (p, "/>"); | |
5925 | } | |
5926 | else | |
5927 | strcpy (p, "</library-list-svr4>"); | |
5928 | ||
2268b414 JK |
5929 | document_len = strlen (document); |
5930 | if (offset < document_len) | |
5931 | document_len -= offset; | |
5932 | else | |
5933 | document_len = 0; | |
5934 | if (len > document_len) | |
5935 | len = document_len; | |
5936 | ||
5937 | memcpy (readbuf, document + offset, len); | |
5938 | xfree (document); | |
5939 | ||
5940 | return len; | |
5941 | } | |
5942 | ||
9accd112 MM |
5943 | #ifdef HAVE_LINUX_BTRACE |
5944 | ||
5945 | /* Enable branch tracing. */ | |
5946 | ||
5947 | static struct btrace_target_info * | |
5948 | linux_low_enable_btrace (ptid_t ptid) | |
5949 | { | |
5950 | struct btrace_target_info *tinfo; | |
5951 | ||
5952 | tinfo = linux_enable_btrace (ptid); | |
3aee8918 | 5953 | |
9accd112 | 5954 | if (tinfo != NULL) |
3aee8918 PA |
5955 | { |
5956 | struct thread_info *thread = find_thread_ptid (ptid); | |
5957 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
5958 | ||
5959 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
5960 | } | |
9accd112 MM |
5961 | |
5962 | return tinfo; | |
5963 | } | |
5964 | ||
5965 | /* Read branch trace data as btrace xml document. */ | |
5966 | ||
5967 | static void | |
5968 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, | |
5969 | int type) | |
5970 | { | |
5971 | VEC (btrace_block_s) *btrace; | |
5972 | struct btrace_block *block; | |
5973 | int i; | |
5974 | ||
5975 | btrace = linux_read_btrace (tinfo, type); | |
5976 | ||
5977 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
5978 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
5979 | ||
5980 | for (i = 0; VEC_iterate (btrace_block_s, btrace, i, block); i++) | |
5981 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
5982 | paddress (block->begin), paddress (block->end)); | |
5983 | ||
5984 | buffer_grow_str (buffer, "</btrace>\n"); | |
5985 | ||
5986 | VEC_free (btrace_block_s, btrace); | |
5987 | } | |
5988 | #endif /* HAVE_LINUX_BTRACE */ | |
5989 | ||
ce3a066d DJ |
5990 | static struct target_ops linux_target_ops = { |
5991 | linux_create_inferior, | |
5992 | linux_attach, | |
5993 | linux_kill, | |
6ad8ae5c | 5994 | linux_detach, |
8336d594 | 5995 | linux_mourn, |
444d6139 | 5996 | linux_join, |
ce3a066d DJ |
5997 | linux_thread_alive, |
5998 | linux_resume, | |
5999 | linux_wait, | |
6000 | linux_fetch_registers, | |
6001 | linux_store_registers, | |
90d74c30 | 6002 | linux_prepare_to_access_memory, |
0146f85b | 6003 | linux_done_accessing_memory, |
ce3a066d DJ |
6004 | linux_read_memory, |
6005 | linux_write_memory, | |
2f2893d9 | 6006 | linux_look_up_symbols, |
ef57601b | 6007 | linux_request_interrupt, |
aa691b87 | 6008 | linux_read_auxv, |
d993e290 PA |
6009 | linux_insert_point, |
6010 | linux_remove_point, | |
e013ee27 OF |
6011 | linux_stopped_by_watchpoint, |
6012 | linux_stopped_data_address, | |
db0dfaa0 LM |
6013 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6014 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6015 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6016 | linux_read_offsets, |
dae5f5cf DJ |
6017 | #else |
6018 | NULL, | |
6019 | #endif | |
6020 | #ifdef USE_THREAD_DB | |
6021 | thread_db_get_tls_address, | |
6022 | #else | |
6023 | NULL, | |
52fb6437 | 6024 | #endif |
efcbbd14 | 6025 | linux_qxfer_spu, |
59a016f0 | 6026 | hostio_last_error_from_errno, |
07e059b5 | 6027 | linux_qxfer_osdata, |
4aa995e1 | 6028 | linux_xfer_siginfo, |
bd99dc85 PA |
6029 | linux_supports_non_stop, |
6030 | linux_async, | |
6031 | linux_start_non_stop, | |
cdbfd419 PP |
6032 | linux_supports_multi_process, |
6033 | #ifdef USE_THREAD_DB | |
dc146f7c | 6034 | thread_db_handle_monitor_command, |
cdbfd419 | 6035 | #else |
dc146f7c | 6036 | NULL, |
cdbfd419 | 6037 | #endif |
d26e3629 | 6038 | linux_common_core_of_thread, |
78d85199 | 6039 | linux_read_loadmap, |
219f2f23 PA |
6040 | linux_process_qsupported, |
6041 | linux_supports_tracepoints, | |
6042 | linux_read_pc, | |
8336d594 PA |
6043 | linux_write_pc, |
6044 | linux_thread_stopped, | |
7984d532 | 6045 | NULL, |
711e434b | 6046 | linux_pause_all, |
7984d532 | 6047 | linux_unpause_all, |
fa593d66 PA |
6048 | linux_cancel_breakpoints, |
6049 | linux_stabilize_threads, | |
6a271cae | 6050 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6051 | linux_emit_ops, |
6052 | linux_supports_disable_randomization, | |
405f8e94 | 6053 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6054 | linux_qxfer_libraries_svr4, |
d1feda86 | 6055 | linux_supports_agent, |
9accd112 MM |
6056 | #ifdef HAVE_LINUX_BTRACE |
6057 | linux_supports_btrace, | |
6058 | linux_low_enable_btrace, | |
6059 | linux_disable_btrace, | |
6060 | linux_low_read_btrace, | |
6061 | #else | |
6062 | NULL, | |
6063 | NULL, | |
6064 | NULL, | |
6065 | NULL, | |
9accd112 | 6066 | #endif |
c2d6af84 | 6067 | linux_supports_range_stepping, |
ce3a066d DJ |
6068 | }; |
6069 | ||
0d62e5e8 DJ |
6070 | static void |
6071 | linux_init_signals () | |
6072 | { | |
6073 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6074 | to find what the cancel signal actually is. */ | |
1a981360 | 6075 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6076 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6077 | #endif |
0d62e5e8 DJ |
6078 | } |
6079 | ||
3aee8918 PA |
6080 | #ifdef HAVE_LINUX_REGSETS |
6081 | void | |
6082 | initialize_regsets_info (struct regsets_info *info) | |
6083 | { | |
6084 | for (info->num_regsets = 0; | |
6085 | info->regsets[info->num_regsets].size >= 0; | |
6086 | info->num_regsets++) | |
6087 | ; | |
3aee8918 PA |
6088 | } |
6089 | #endif | |
6090 | ||
da6d8c04 DJ |
6091 | void |
6092 | initialize_low (void) | |
6093 | { | |
bd99dc85 PA |
6094 | struct sigaction sigchld_action; |
6095 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6096 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6097 | set_breakpoint_data (the_low_target.breakpoint, |
6098 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6099 | linux_init_signals (); |
24a09b5f | 6100 | linux_test_for_tracefork (); |
aa7c7447 | 6101 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6102 | |
6103 | sigchld_action.sa_handler = sigchld_handler; | |
6104 | sigemptyset (&sigchld_action.sa_mask); | |
6105 | sigchld_action.sa_flags = SA_RESTART; | |
6106 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6107 | |
6108 | initialize_low_arch (); | |
da6d8c04 | 6109 | } |