]>
Commit | Line | Data |
---|---|---|
da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 1995-2015 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" |
125f8a3d | 21 | #include "nat/linux-osdata.h" |
58b4daa5 | 22 | #include "agent.h" |
de0d863e | 23 | #include "tdesc.h" |
b20a6524 | 24 | #include "rsp-low.h" |
da6d8c04 | 25 | |
96d7229d LM |
26 | #include "nat/linux-nat.h" |
27 | #include "nat/linux-waitpid.h" | |
8bdce1ff | 28 | #include "gdb_wait.h" |
5826e159 | 29 | #include "nat/gdb_ptrace.h" |
125f8a3d GB |
30 | #include "nat/linux-ptrace.h" |
31 | #include "nat/linux-procfs.h" | |
8cc73a39 | 32 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
33 | #include <signal.h> |
34 | #include <sys/ioctl.h> | |
35 | #include <fcntl.h> | |
0a30fbc4 | 36 | #include <unistd.h> |
fd500816 | 37 | #include <sys/syscall.h> |
f9387fc3 | 38 | #include <sched.h> |
07e059b5 VP |
39 | #include <ctype.h> |
40 | #include <pwd.h> | |
41 | #include <sys/types.h> | |
42 | #include <dirent.h> | |
53ce3c39 | 43 | #include <sys/stat.h> |
efcbbd14 | 44 | #include <sys/vfs.h> |
1570b33e | 45 | #include <sys/uio.h> |
602e3198 | 46 | #include "filestuff.h" |
c144c7a0 | 47 | #include "tracepoint.h" |
533b0600 | 48 | #include "hostio.h" |
957f3f49 DE |
49 | #ifndef ELFMAG0 |
50 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
51 | then ELFMAG0 will have been defined. If it didn't get included by | |
52 | gdb_proc_service.h then including it will likely introduce a duplicate | |
53 | definition of elf_fpregset_t. */ | |
54 | #include <elf.h> | |
55 | #endif | |
14d2069a | 56 | #include "nat/linux-namespaces.h" |
efcbbd14 UW |
57 | |
58 | #ifndef SPUFS_MAGIC | |
59 | #define SPUFS_MAGIC 0x23c9b64e | |
60 | #endif | |
da6d8c04 | 61 | |
03583c20 UW |
62 | #ifdef HAVE_PERSONALITY |
63 | # include <sys/personality.h> | |
64 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
65 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
66 | # endif | |
67 | #endif | |
68 | ||
fd462a61 DJ |
69 | #ifndef O_LARGEFILE |
70 | #define O_LARGEFILE 0 | |
71 | #endif | |
72 | ||
ec8ebe72 DE |
73 | #ifndef W_STOPCODE |
74 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
75 | #endif | |
76 | ||
1a981360 PA |
77 | /* This is the kernel's hard limit. Not to be confused with |
78 | SIGRTMIN. */ | |
79 | #ifndef __SIGRTMIN | |
80 | #define __SIGRTMIN 32 | |
81 | #endif | |
82 | ||
db0dfaa0 LM |
83 | /* Some targets did not define these ptrace constants from the start, |
84 | so gdbserver defines them locally here. In the future, these may | |
85 | be removed after they are added to asm/ptrace.h. */ | |
86 | #if !(defined(PT_TEXT_ADDR) \ | |
87 | || defined(PT_DATA_ADDR) \ | |
88 | || defined(PT_TEXT_END_ADDR)) | |
89 | #if defined(__mcoldfire__) | |
90 | /* These are still undefined in 3.10 kernels. */ | |
91 | #define PT_TEXT_ADDR 49*4 | |
92 | #define PT_DATA_ADDR 50*4 | |
93 | #define PT_TEXT_END_ADDR 51*4 | |
94 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
95 | #elif defined(BFIN) | |
96 | #define PT_TEXT_ADDR 220 | |
97 | #define PT_TEXT_END_ADDR 224 | |
98 | #define PT_DATA_ADDR 228 | |
99 | /* These are still undefined in 3.10 kernels. */ | |
100 | #elif defined(__TMS320C6X__) | |
101 | #define PT_TEXT_ADDR (0x10000*4) | |
102 | #define PT_DATA_ADDR (0x10004*4) | |
103 | #define PT_TEXT_END_ADDR (0x10008*4) | |
104 | #endif | |
105 | #endif | |
106 | ||
9accd112 | 107 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 108 | # include "nat/linux-btrace.h" |
734b0e4b | 109 | # include "btrace-common.h" |
9accd112 MM |
110 | #endif |
111 | ||
8365dcf5 TJB |
112 | #ifndef HAVE_ELF32_AUXV_T |
113 | /* Copied from glibc's elf.h. */ | |
114 | typedef struct | |
115 | { | |
116 | uint32_t a_type; /* Entry type */ | |
117 | union | |
118 | { | |
119 | uint32_t a_val; /* Integer value */ | |
120 | /* We use to have pointer elements added here. We cannot do that, | |
121 | though, since it does not work when using 32-bit definitions | |
122 | on 64-bit platforms and vice versa. */ | |
123 | } a_un; | |
124 | } Elf32_auxv_t; | |
125 | #endif | |
126 | ||
127 | #ifndef HAVE_ELF64_AUXV_T | |
128 | /* Copied from glibc's elf.h. */ | |
129 | typedef struct | |
130 | { | |
131 | uint64_t a_type; /* Entry type */ | |
132 | union | |
133 | { | |
134 | uint64_t a_val; /* Integer value */ | |
135 | /* We use to have pointer elements added here. We cannot do that, | |
136 | though, since it does not work when using 32-bit definitions | |
137 | on 64-bit platforms and vice versa. */ | |
138 | } a_un; | |
139 | } Elf64_auxv_t; | |
140 | #endif | |
141 | ||
ded48a5e YQ |
142 | /* Does the current host support PTRACE_GETREGSET? */ |
143 | int have_ptrace_getregset = -1; | |
144 | ||
cff068da GB |
145 | /* LWP accessors. */ |
146 | ||
147 | /* See nat/linux-nat.h. */ | |
148 | ||
149 | ptid_t | |
150 | ptid_of_lwp (struct lwp_info *lwp) | |
151 | { | |
152 | return ptid_of (get_lwp_thread (lwp)); | |
153 | } | |
154 | ||
155 | /* See nat/linux-nat.h. */ | |
156 | ||
4b134ca1 GB |
157 | void |
158 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
159 | struct arch_lwp_info *info) | |
160 | { | |
161 | lwp->arch_private = info; | |
162 | } | |
163 | ||
164 | /* See nat/linux-nat.h. */ | |
165 | ||
166 | struct arch_lwp_info * | |
167 | lwp_arch_private_info (struct lwp_info *lwp) | |
168 | { | |
169 | return lwp->arch_private; | |
170 | } | |
171 | ||
172 | /* See nat/linux-nat.h. */ | |
173 | ||
cff068da GB |
174 | int |
175 | lwp_is_stopped (struct lwp_info *lwp) | |
176 | { | |
177 | return lwp->stopped; | |
178 | } | |
179 | ||
180 | /* See nat/linux-nat.h. */ | |
181 | ||
182 | enum target_stop_reason | |
183 | lwp_stop_reason (struct lwp_info *lwp) | |
184 | { | |
185 | return lwp->stop_reason; | |
186 | } | |
187 | ||
05044653 PA |
188 | /* A list of all unknown processes which receive stop signals. Some |
189 | other process will presumably claim each of these as forked | |
190 | children momentarily. */ | |
24a09b5f | 191 | |
05044653 PA |
192 | struct simple_pid_list |
193 | { | |
194 | /* The process ID. */ | |
195 | int pid; | |
196 | ||
197 | /* The status as reported by waitpid. */ | |
198 | int status; | |
199 | ||
200 | /* Next in chain. */ | |
201 | struct simple_pid_list *next; | |
202 | }; | |
203 | struct simple_pid_list *stopped_pids; | |
204 | ||
205 | /* Trivial list manipulation functions to keep track of a list of new | |
206 | stopped processes. */ | |
207 | ||
208 | static void | |
209 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
210 | { | |
211 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
212 | ||
213 | new_pid->pid = pid; | |
214 | new_pid->status = status; | |
215 | new_pid->next = *listp; | |
216 | *listp = new_pid; | |
217 | } | |
218 | ||
219 | static int | |
220 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
221 | { | |
222 | struct simple_pid_list **p; | |
223 | ||
224 | for (p = listp; *p != NULL; p = &(*p)->next) | |
225 | if ((*p)->pid == pid) | |
226 | { | |
227 | struct simple_pid_list *next = (*p)->next; | |
228 | ||
229 | *statusp = (*p)->status; | |
230 | xfree (*p); | |
231 | *p = next; | |
232 | return 1; | |
233 | } | |
234 | return 0; | |
235 | } | |
24a09b5f | 236 | |
bde24c0a PA |
237 | enum stopping_threads_kind |
238 | { | |
239 | /* Not stopping threads presently. */ | |
240 | NOT_STOPPING_THREADS, | |
241 | ||
242 | /* Stopping threads. */ | |
243 | STOPPING_THREADS, | |
244 | ||
245 | /* Stopping and suspending threads. */ | |
246 | STOPPING_AND_SUSPENDING_THREADS | |
247 | }; | |
248 | ||
249 | /* This is set while stop_all_lwps is in effect. */ | |
250 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
251 | |
252 | /* FIXME make into a target method? */ | |
24a09b5f | 253 | int using_threads = 1; |
24a09b5f | 254 | |
fa593d66 PA |
255 | /* True if we're presently stabilizing threads (moving them out of |
256 | jump pads). */ | |
257 | static int stabilizing_threads; | |
258 | ||
2acc282a | 259 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 260 | int step, int signal, siginfo_t *info); |
2bd7c093 | 261 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
262 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
263 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
264 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
265 | int *wstat, int options); | |
95954743 | 266 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 267 | static struct lwp_info *add_lwp (ptid_t ptid); |
c35fafde | 268 | static int linux_stopped_by_watchpoint (void); |
95954743 | 269 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 270 | static void proceed_all_lwps (void); |
d50171e4 | 271 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 PA |
272 | static int kill_lwp (unsigned long lwpid, int signo); |
273 | ||
582511be PA |
274 | /* When the event-loop is doing a step-over, this points at the thread |
275 | being stepped. */ | |
276 | ptid_t step_over_bkpt; | |
277 | ||
d50171e4 PA |
278 | /* True if the low target can hardware single-step. Such targets |
279 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
280 | ||
281 | static int | |
282 | can_hardware_single_step (void) | |
283 | { | |
284 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
285 | } | |
286 | ||
287 | /* True if the low target supports memory breakpoints. If so, we'll | |
288 | have a GET_PC implementation. */ | |
289 | ||
290 | static int | |
291 | supports_breakpoints (void) | |
292 | { | |
293 | return (the_low_target.get_pc != NULL); | |
294 | } | |
0d62e5e8 | 295 | |
fa593d66 PA |
296 | /* Returns true if this target can support fast tracepoints. This |
297 | does not mean that the in-process agent has been loaded in the | |
298 | inferior. */ | |
299 | ||
300 | static int | |
301 | supports_fast_tracepoints (void) | |
302 | { | |
303 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
304 | } | |
305 | ||
c2d6af84 PA |
306 | /* True if LWP is stopped in its stepping range. */ |
307 | ||
308 | static int | |
309 | lwp_in_step_range (struct lwp_info *lwp) | |
310 | { | |
311 | CORE_ADDR pc = lwp->stop_pc; | |
312 | ||
313 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
314 | } | |
315 | ||
0d62e5e8 DJ |
316 | struct pending_signals |
317 | { | |
318 | int signal; | |
32ca6d61 | 319 | siginfo_t info; |
0d62e5e8 DJ |
320 | struct pending_signals *prev; |
321 | }; | |
611cb4a5 | 322 | |
bd99dc85 PA |
323 | /* The read/write ends of the pipe registered as waitable file in the |
324 | event loop. */ | |
325 | static int linux_event_pipe[2] = { -1, -1 }; | |
326 | ||
327 | /* True if we're currently in async mode. */ | |
328 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
329 | ||
02fc4de7 | 330 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 331 | static void wait_for_sigstop (void); |
bd99dc85 | 332 | |
d0722149 DE |
333 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
334 | ||
335 | static int | |
214d508e | 336 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 337 | { |
214d508e L |
338 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
339 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
340 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
341 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
342 | { | |
343 | *machine = header->e_machine; | |
344 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
345 | ||
346 | } | |
347 | *machine = EM_NONE; | |
348 | return -1; | |
d0722149 DE |
349 | } |
350 | ||
351 | /* Return non-zero if FILE is a 64-bit ELF file, | |
352 | zero if the file is not a 64-bit ELF file, | |
353 | and -1 if the file is not accessible or doesn't exist. */ | |
354 | ||
be07f1a2 | 355 | static int |
214d508e | 356 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 357 | { |
957f3f49 | 358 | Elf64_Ehdr header; |
d0722149 DE |
359 | int fd; |
360 | ||
361 | fd = open (file, O_RDONLY); | |
362 | if (fd < 0) | |
363 | return -1; | |
364 | ||
365 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
366 | { | |
367 | close (fd); | |
368 | return 0; | |
369 | } | |
370 | close (fd); | |
371 | ||
214d508e | 372 | return elf_64_header_p (&header, machine); |
d0722149 DE |
373 | } |
374 | ||
be07f1a2 PA |
375 | /* Accepts an integer PID; Returns true if the executable PID is |
376 | running is a 64-bit ELF file.. */ | |
377 | ||
378 | int | |
214d508e | 379 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 380 | { |
d8d2a3ee | 381 | char file[PATH_MAX]; |
be07f1a2 PA |
382 | |
383 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 384 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
385 | } |
386 | ||
bd99dc85 PA |
387 | static void |
388 | delete_lwp (struct lwp_info *lwp) | |
389 | { | |
fa96cb38 PA |
390 | struct thread_info *thr = get_lwp_thread (lwp); |
391 | ||
392 | if (debug_threads) | |
393 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
394 | ||
395 | remove_thread (thr); | |
aa5ca48f | 396 | free (lwp->arch_private); |
bd99dc85 PA |
397 | free (lwp); |
398 | } | |
399 | ||
95954743 PA |
400 | /* Add a process to the common process list, and set its private |
401 | data. */ | |
402 | ||
403 | static struct process_info * | |
404 | linux_add_process (int pid, int attached) | |
405 | { | |
406 | struct process_info *proc; | |
407 | ||
95954743 | 408 | proc = add_process (pid, attached); |
fe978cb0 | 409 | proc->priv = xcalloc (1, sizeof (*proc->priv)); |
95954743 | 410 | |
aa5ca48f | 411 | if (the_low_target.new_process != NULL) |
fe978cb0 | 412 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 413 | |
95954743 PA |
414 | return proc; |
415 | } | |
416 | ||
582511be PA |
417 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
418 | ||
bd99dc85 | 419 | /* Handle a GNU/Linux extended wait response. If we see a clone |
de0d863e DB |
420 | event, we need to add the new LWP to our list (and return 0 so as |
421 | not to report the trap to higher layers). */ | |
0d62e5e8 | 422 | |
de0d863e DB |
423 | static int |
424 | handle_extended_wait (struct lwp_info *event_lwp, int wstat) | |
24a09b5f | 425 | { |
89a5711c | 426 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 427 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 428 | struct lwp_info *new_lwp; |
24a09b5f | 429 | |
c269dbdb DB |
430 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
431 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 432 | { |
95954743 | 433 | ptid_t ptid; |
24a09b5f | 434 | unsigned long new_pid; |
05044653 | 435 | int ret, status; |
24a09b5f | 436 | |
de0d863e | 437 | /* Get the pid of the new lwp. */ |
d86d4aaf | 438 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 439 | &new_pid); |
24a09b5f DJ |
440 | |
441 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 442 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
443 | { |
444 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
445 | hits the SIGSTOP, but we're already attached. */ | |
446 | ||
97438e3f | 447 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
448 | |
449 | if (ret == -1) | |
450 | perror_with_name ("waiting for new child"); | |
451 | else if (ret != new_pid) | |
452 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 453 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
454 | warning ("wait returned unexpected status 0x%x", status); |
455 | } | |
456 | ||
c269dbdb | 457 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
458 | { |
459 | struct process_info *parent_proc; | |
460 | struct process_info *child_proc; | |
461 | struct lwp_info *child_lwp; | |
bfacd19d | 462 | struct thread_info *child_thr; |
de0d863e DB |
463 | struct target_desc *tdesc; |
464 | ||
465 | ptid = ptid_build (new_pid, new_pid, 0); | |
466 | ||
467 | if (debug_threads) | |
468 | { | |
469 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
470 | "new child is %d\n", | |
471 | ptid_get_lwp (ptid_of (event_thr)), | |
472 | ptid_get_pid (ptid)); | |
473 | } | |
474 | ||
475 | /* Add the new process to the tables and clone the breakpoint | |
476 | lists of the parent. We need to do this even if the new process | |
477 | will be detached, since we will need the process object and the | |
478 | breakpoints to remove any breakpoints from memory when we | |
479 | detach, and the client side will access registers. */ | |
480 | child_proc = linux_add_process (new_pid, 0); | |
481 | gdb_assert (child_proc != NULL); | |
482 | child_lwp = add_lwp (ptid); | |
483 | gdb_assert (child_lwp != NULL); | |
484 | child_lwp->stopped = 1; | |
bfacd19d DB |
485 | child_lwp->must_set_ptrace_flags = 1; |
486 | child_lwp->status_pending_p = 0; | |
487 | child_thr = get_lwp_thread (child_lwp); | |
488 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
489 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
490 | ||
de0d863e DB |
491 | parent_proc = get_thread_process (event_thr); |
492 | child_proc->attached = parent_proc->attached; | |
493 | clone_all_breakpoints (&child_proc->breakpoints, | |
494 | &child_proc->raw_breakpoints, | |
495 | parent_proc->breakpoints); | |
496 | ||
497 | tdesc = xmalloc (sizeof (struct target_desc)); | |
498 | copy_target_description (tdesc, parent_proc->tdesc); | |
499 | child_proc->tdesc = tdesc; | |
de0d863e | 500 | |
3a8a0396 DB |
501 | /* Clone arch-specific process data. */ |
502 | if (the_low_target.new_fork != NULL) | |
503 | the_low_target.new_fork (parent_proc, child_proc); | |
504 | ||
de0d863e | 505 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
506 | if (event == PTRACE_EVENT_FORK) |
507 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
508 | else if (event == PTRACE_EVENT_VFORK) | |
509 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
510 | ||
de0d863e | 511 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 512 | |
de0d863e DB |
513 | /* The status_pending field contains bits denoting the |
514 | extended event, so when the pending event is handled, | |
515 | the handler will look at lwp->waitstatus. */ | |
516 | event_lwp->status_pending_p = 1; | |
517 | event_lwp->status_pending = wstat; | |
518 | ||
519 | /* Report the event. */ | |
520 | return 0; | |
521 | } | |
522 | ||
fa96cb38 PA |
523 | if (debug_threads) |
524 | debug_printf ("HEW: Got clone event " | |
525 | "from LWP %ld, new child is LWP %ld\n", | |
526 | lwpid_of (event_thr), new_pid); | |
527 | ||
d86d4aaf | 528 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 529 | new_lwp = add_lwp (ptid); |
24a09b5f | 530 | |
e27d73f6 DE |
531 | /* Either we're going to immediately resume the new thread |
532 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
533 | thinks the thread is currently running, so set this first | |
534 | before calling linux_resume_one_lwp. */ | |
535 | new_lwp->stopped = 1; | |
536 | ||
bde24c0a PA |
537 | /* If we're suspending all threads, leave this one suspended |
538 | too. */ | |
539 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
540 | new_lwp->suspended = 1; | |
541 | ||
da5898ce DJ |
542 | /* Normally we will get the pending SIGSTOP. But in some cases |
543 | we might get another signal delivered to the group first. | |
f21cc1a2 | 544 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 545 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 546 | { |
54a0b537 | 547 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
548 | new_lwp->status_pending_p = 1; |
549 | new_lwp->status_pending = status; | |
da5898ce | 550 | } |
de0d863e DB |
551 | |
552 | /* Don't report the event. */ | |
553 | return 1; | |
24a09b5f | 554 | } |
c269dbdb DB |
555 | else if (event == PTRACE_EVENT_VFORK_DONE) |
556 | { | |
557 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
558 | ||
559 | /* Report the event. */ | |
560 | return 0; | |
561 | } | |
de0d863e DB |
562 | |
563 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
564 | } |
565 | ||
d50171e4 PA |
566 | /* Return the PC as read from the regcache of LWP, without any |
567 | adjustment. */ | |
568 | ||
569 | static CORE_ADDR | |
570 | get_pc (struct lwp_info *lwp) | |
571 | { | |
0bfdf32f | 572 | struct thread_info *saved_thread; |
d50171e4 PA |
573 | struct regcache *regcache; |
574 | CORE_ADDR pc; | |
575 | ||
576 | if (the_low_target.get_pc == NULL) | |
577 | return 0; | |
578 | ||
0bfdf32f GB |
579 | saved_thread = current_thread; |
580 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 581 | |
0bfdf32f | 582 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
583 | pc = (*the_low_target.get_pc) (regcache); |
584 | ||
585 | if (debug_threads) | |
87ce2a04 | 586 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 587 | |
0bfdf32f | 588 | current_thread = saved_thread; |
d50171e4 PA |
589 | return pc; |
590 | } | |
591 | ||
592 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
593 | The SIGTRAP could mean several things. |
594 | ||
595 | On i386, where decr_pc_after_break is non-zero: | |
582511be PA |
596 | |
597 | If we were single-stepping this process using PTRACE_SINGLESTEP, we | |
598 | will get only the one SIGTRAP. The value of $eip will be the next | |
599 | instruction. If the instruction we stepped over was a breakpoint, | |
600 | we need to decrement the PC. | |
601 | ||
0d62e5e8 DJ |
602 | If we continue the process using PTRACE_CONT, we will get a |
603 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
604 | the instruction after the breakpoint (i.e. needs to be | |
605 | decremented). If we report the SIGTRAP to GDB, we must also | |
582511be | 606 | report the undecremented PC. If the breakpoint is removed, we |
0d62e5e8 DJ |
607 | must resume at the decremented PC. |
608 | ||
582511be PA |
609 | On a non-decr_pc_after_break machine with hardware or kernel |
610 | single-step: | |
611 | ||
612 | If we either single-step a breakpoint instruction, or continue and | |
613 | hit a breakpoint instruction, our PC will point at the breakpoint | |
0d62e5e8 DJ |
614 | instruction. */ |
615 | ||
582511be PA |
616 | static int |
617 | check_stopped_by_breakpoint (struct lwp_info *lwp) | |
0d62e5e8 | 618 | { |
582511be PA |
619 | CORE_ADDR pc; |
620 | CORE_ADDR sw_breakpoint_pc; | |
621 | struct thread_info *saved_thread; | |
3e572f71 PA |
622 | #if USE_SIGTRAP_SIGINFO |
623 | siginfo_t siginfo; | |
624 | #endif | |
d50171e4 PA |
625 | |
626 | if (the_low_target.get_pc == NULL) | |
627 | return 0; | |
0d62e5e8 | 628 | |
582511be PA |
629 | pc = get_pc (lwp); |
630 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 631 | |
582511be PA |
632 | /* breakpoint_at reads from the current thread. */ |
633 | saved_thread = current_thread; | |
634 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 635 | |
3e572f71 PA |
636 | #if USE_SIGTRAP_SIGINFO |
637 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
638 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
639 | { | |
640 | if (siginfo.si_signo == SIGTRAP) | |
641 | { | |
642 | if (siginfo.si_code == GDB_ARCH_TRAP_BRKPT) | |
643 | { | |
644 | if (debug_threads) | |
645 | { | |
646 | struct thread_info *thr = get_lwp_thread (lwp); | |
647 | ||
2bf6fb9d | 648 | debug_printf ("CSBB: %s stopped by software breakpoint\n", |
3e572f71 PA |
649 | target_pid_to_str (ptid_of (thr))); |
650 | } | |
651 | ||
652 | /* Back up the PC if necessary. */ | |
653 | if (pc != sw_breakpoint_pc) | |
654 | { | |
655 | struct regcache *regcache | |
656 | = get_thread_regcache (current_thread, 1); | |
657 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
658 | } | |
659 | ||
660 | lwp->stop_pc = sw_breakpoint_pc; | |
661 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
662 | current_thread = saved_thread; | |
663 | return 1; | |
664 | } | |
665 | else if (siginfo.si_code == TRAP_HWBKPT) | |
666 | { | |
667 | if (debug_threads) | |
668 | { | |
669 | struct thread_info *thr = get_lwp_thread (lwp); | |
670 | ||
2bf6fb9d PA |
671 | debug_printf ("CSBB: %s stopped by hardware " |
672 | "breakpoint/watchpoint\n", | |
3e572f71 PA |
673 | target_pid_to_str (ptid_of (thr))); |
674 | } | |
675 | ||
676 | lwp->stop_pc = pc; | |
677 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
678 | current_thread = saved_thread; | |
679 | return 1; | |
680 | } | |
2bf6fb9d PA |
681 | else if (siginfo.si_code == TRAP_TRACE) |
682 | { | |
683 | if (debug_threads) | |
684 | { | |
685 | struct thread_info *thr = get_lwp_thread (lwp); | |
686 | ||
687 | debug_printf ("CSBB: %s stopped by trace\n", | |
688 | target_pid_to_str (ptid_of (thr))); | |
689 | } | |
690 | } | |
3e572f71 PA |
691 | } |
692 | } | |
693 | #else | |
582511be PA |
694 | /* We may have just stepped a breakpoint instruction. E.g., in |
695 | non-stop mode, GDB first tells the thread A to step a range, and | |
696 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
697 | case we need to report the breakpoint PC. */ |
698 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be PA |
699 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
700 | { | |
701 | if (debug_threads) | |
702 | { | |
703 | struct thread_info *thr = get_lwp_thread (lwp); | |
704 | ||
705 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
706 | target_pid_to_str (ptid_of (thr))); | |
707 | } | |
708 | ||
709 | /* Back up the PC if necessary. */ | |
710 | if (pc != sw_breakpoint_pc) | |
711 | { | |
712 | struct regcache *regcache | |
713 | = get_thread_regcache (current_thread, 1); | |
714 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
715 | } | |
716 | ||
717 | lwp->stop_pc = sw_breakpoint_pc; | |
15c66dd6 | 718 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
582511be PA |
719 | current_thread = saved_thread; |
720 | return 1; | |
721 | } | |
722 | ||
723 | if (hardware_breakpoint_inserted_here (pc)) | |
724 | { | |
725 | if (debug_threads) | |
726 | { | |
727 | struct thread_info *thr = get_lwp_thread (lwp); | |
728 | ||
729 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
730 | target_pid_to_str (ptid_of (thr))); | |
731 | } | |
47c0c975 | 732 | |
582511be | 733 | lwp->stop_pc = pc; |
15c66dd6 | 734 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; |
582511be PA |
735 | current_thread = saved_thread; |
736 | return 1; | |
737 | } | |
3e572f71 | 738 | #endif |
582511be PA |
739 | |
740 | current_thread = saved_thread; | |
741 | return 0; | |
0d62e5e8 | 742 | } |
ce3a066d | 743 | |
b3312d80 | 744 | static struct lwp_info * |
95954743 | 745 | add_lwp (ptid_t ptid) |
611cb4a5 | 746 | { |
54a0b537 | 747 | struct lwp_info *lwp; |
0d62e5e8 | 748 | |
54a0b537 PA |
749 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
750 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 751 | |
aa5ca48f | 752 | if (the_low_target.new_thread != NULL) |
34c703da | 753 | the_low_target.new_thread (lwp); |
aa5ca48f | 754 | |
f7667f0d | 755 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 756 | |
54a0b537 | 757 | return lwp; |
0d62e5e8 | 758 | } |
611cb4a5 | 759 | |
da6d8c04 DJ |
760 | /* Start an inferior process and returns its pid. |
761 | ALLARGS is a vector of program-name and args. */ | |
762 | ||
ce3a066d DJ |
763 | static int |
764 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 765 | { |
a6dbe5df | 766 | struct lwp_info *new_lwp; |
da6d8c04 | 767 | int pid; |
95954743 | 768 | ptid_t ptid; |
8cc73a39 SDJ |
769 | struct cleanup *restore_personality |
770 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 771 | |
42c81e2a | 772 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
773 | pid = vfork (); |
774 | #else | |
da6d8c04 | 775 | pid = fork (); |
52fb6437 | 776 | #endif |
da6d8c04 DJ |
777 | if (pid < 0) |
778 | perror_with_name ("fork"); | |
779 | ||
780 | if (pid == 0) | |
781 | { | |
602e3198 | 782 | close_most_fds (); |
b8e1b30e | 783 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 784 | |
1a981360 | 785 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 786 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 787 | #endif |
0d62e5e8 | 788 | |
a9fa9f7d DJ |
789 | setpgid (0, 0); |
790 | ||
e0f9f062 DE |
791 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
792 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
793 | Also, redirect stdin to /dev/null. */ | |
794 | if (remote_connection_is_stdio ()) | |
795 | { | |
796 | close (0); | |
797 | open ("/dev/null", O_RDONLY); | |
798 | dup2 (2, 1); | |
3e52c33d JK |
799 | if (write (2, "stdin/stdout redirected\n", |
800 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
801 | { |
802 | /* Errors ignored. */; | |
803 | } | |
e0f9f062 DE |
804 | } |
805 | ||
2b876972 DJ |
806 | execv (program, allargs); |
807 | if (errno == ENOENT) | |
808 | execvp (program, allargs); | |
da6d8c04 DJ |
809 | |
810 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 811 | strerror (errno)); |
da6d8c04 DJ |
812 | fflush (stderr); |
813 | _exit (0177); | |
814 | } | |
815 | ||
8cc73a39 | 816 | do_cleanups (restore_personality); |
03583c20 | 817 | |
55d7b841 | 818 | linux_add_process (pid, 0); |
95954743 PA |
819 | |
820 | ptid = ptid_build (pid, pid, 0); | |
821 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 822 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 823 | |
a9fa9f7d | 824 | return pid; |
da6d8c04 DJ |
825 | } |
826 | ||
c06cbd92 YQ |
827 | /* Implement the arch_setup target_ops method. */ |
828 | ||
829 | static void | |
830 | linux_arch_setup (void) | |
831 | { | |
832 | the_low_target.arch_setup (); | |
833 | } | |
834 | ||
8784d563 PA |
835 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
836 | error. */ | |
da6d8c04 | 837 | |
7ae1a6a6 PA |
838 | int |
839 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 840 | { |
54a0b537 | 841 | struct lwp_info *new_lwp; |
7ae1a6a6 | 842 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 843 | |
b8e1b30e | 844 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 845 | != 0) |
7ae1a6a6 | 846 | return errno; |
24a09b5f | 847 | |
b3312d80 | 848 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 849 | |
a6dbe5df PA |
850 | /* We need to wait for SIGSTOP before being able to make the next |
851 | ptrace call on this LWP. */ | |
852 | new_lwp->must_set_ptrace_flags = 1; | |
853 | ||
644cebc9 | 854 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
855 | { |
856 | if (debug_threads) | |
87ce2a04 | 857 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
858 | |
859 | /* The process is definitely stopped. It is in a job control | |
860 | stop, unless the kernel predates the TASK_STOPPED / | |
861 | TASK_TRACED distinction, in which case it might be in a | |
862 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
863 | can kill it, signal it, et cetera. | |
864 | ||
865 | First make sure there is a pending SIGSTOP. Since we are | |
866 | already attached, the process can not transition from stopped | |
867 | to running without a PTRACE_CONT; so we know this signal will | |
868 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
869 | probably already in the queue (unless this kernel is old | |
870 | enough to use TASK_STOPPED for ptrace stops); but since | |
871 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
872 | kill_lwp (lwpid, SIGSTOP); | |
873 | ||
874 | /* Finally, resume the stopped process. This will deliver the | |
875 | SIGSTOP (or a higher priority signal, just like normal | |
876 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 877 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
878 | } |
879 | ||
0d62e5e8 | 880 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
881 | brings it to a halt. |
882 | ||
883 | There are several cases to consider here: | |
884 | ||
885 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 886 | of a new thread that is being created. |
d50171e4 PA |
887 | In this case we should ignore that SIGSTOP and resume the |
888 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 889 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 890 | resume_continue. |
0e21c1ec DE |
891 | |
892 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
893 | to it via attach_inferior. |
894 | In this case we want the process thread to stop. | |
d50171e4 PA |
895 | This is handled by having linux_attach set last_resume_kind == |
896 | resume_stop after we return. | |
e3deef73 LM |
897 | |
898 | If the pid we are attaching to is also the tgid, we attach to and | |
899 | stop all the existing threads. Otherwise, we attach to pid and | |
900 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
901 | |
902 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
903 | existing threads. |
904 | In this case we want the thread to stop. | |
905 | FIXME: This case is currently not properly handled. | |
906 | We should wait for the SIGSTOP but don't. Things work apparently | |
907 | because enough time passes between when we ptrace (ATTACH) and when | |
908 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
909 | |
910 | On the other hand, if we are currently trying to stop all threads, we | |
911 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 912 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
913 | end of the list, and so the new thread has not yet reached |
914 | wait_for_sigstop (but will). */ | |
d50171e4 | 915 | new_lwp->stop_expected = 1; |
0d62e5e8 | 916 | |
7ae1a6a6 | 917 | return 0; |
95954743 PA |
918 | } |
919 | ||
8784d563 PA |
920 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
921 | already attached. Returns true if a new LWP is found, false | |
922 | otherwise. */ | |
923 | ||
924 | static int | |
925 | attach_proc_task_lwp_callback (ptid_t ptid) | |
926 | { | |
927 | /* Is this a new thread? */ | |
928 | if (find_thread_ptid (ptid) == NULL) | |
929 | { | |
930 | int lwpid = ptid_get_lwp (ptid); | |
931 | int err; | |
932 | ||
933 | if (debug_threads) | |
934 | debug_printf ("Found new lwp %d\n", lwpid); | |
935 | ||
936 | err = linux_attach_lwp (ptid); | |
937 | ||
938 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
939 | is returned if the thread's task still exists, and is marked | |
940 | as exited or zombie, as well as other conditions, so in that | |
941 | case, confirm the status in /proc/PID/status. */ | |
942 | if (err == ESRCH | |
943 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
944 | { | |
945 | if (debug_threads) | |
946 | { | |
947 | debug_printf ("Cannot attach to lwp %d: " | |
948 | "thread is gone (%d: %s)\n", | |
949 | lwpid, err, strerror (err)); | |
950 | } | |
951 | } | |
952 | else if (err != 0) | |
953 | { | |
954 | warning (_("Cannot attach to lwp %d: %s"), | |
955 | lwpid, | |
956 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
957 | } | |
958 | ||
959 | return 1; | |
960 | } | |
961 | return 0; | |
962 | } | |
963 | ||
e3deef73 LM |
964 | /* Attach to PID. If PID is the tgid, attach to it and all |
965 | of its threads. */ | |
966 | ||
c52daf70 | 967 | static int |
a1928bad | 968 | linux_attach (unsigned long pid) |
0d62e5e8 | 969 | { |
7ae1a6a6 PA |
970 | ptid_t ptid = ptid_build (pid, pid, 0); |
971 | int err; | |
972 | ||
e3deef73 LM |
973 | /* Attach to PID. We will check for other threads |
974 | soon. */ | |
7ae1a6a6 PA |
975 | err = linux_attach_lwp (ptid); |
976 | if (err != 0) | |
977 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 978 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 979 | |
55d7b841 | 980 | linux_add_process (pid, 1); |
0d62e5e8 | 981 | |
bd99dc85 PA |
982 | if (!non_stop) |
983 | { | |
8336d594 PA |
984 | struct thread_info *thread; |
985 | ||
986 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
987 | process. It will be collected by wait shortly. */ | |
988 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
989 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 990 | } |
0d62e5e8 | 991 | |
8784d563 PA |
992 | /* We must attach to every LWP. If /proc is mounted, use that to |
993 | find them now. On the one hand, the inferior may be using raw | |
994 | clone instead of using pthreads. On the other hand, even if it | |
995 | is using pthreads, GDB may not be connected yet (thread_db needs | |
996 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
997 | structures in the inferior's address space to find the list of | |
998 | threads/LWPs, and those structures may well be corrupted. Note | |
999 | that once thread_db is loaded, we'll still use it to list threads | |
1000 | and associate pthread info with each LWP. */ | |
1001 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
95954743 PA |
1002 | return 0; |
1003 | } | |
1004 | ||
1005 | struct counter | |
1006 | { | |
1007 | int pid; | |
1008 | int count; | |
1009 | }; | |
1010 | ||
1011 | static int | |
1012 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
1013 | { | |
1014 | struct counter *counter = args; | |
1015 | ||
1016 | if (ptid_get_pid (entry->id) == counter->pid) | |
1017 | { | |
1018 | if (++counter->count > 1) | |
1019 | return 1; | |
1020 | } | |
d61ddec4 | 1021 | |
da6d8c04 DJ |
1022 | return 0; |
1023 | } | |
1024 | ||
95954743 | 1025 | static int |
fa96cb38 | 1026 | last_thread_of_process_p (int pid) |
95954743 | 1027 | { |
95954743 | 1028 | struct counter counter = { pid , 0 }; |
da6d8c04 | 1029 | |
95954743 PA |
1030 | return (find_inferior (&all_threads, |
1031 | second_thread_of_pid_p, &counter) == NULL); | |
1032 | } | |
1033 | ||
da84f473 PA |
1034 | /* Kill LWP. */ |
1035 | ||
1036 | static void | |
1037 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1038 | { | |
d86d4aaf DE |
1039 | struct thread_info *thr = get_lwp_thread (lwp); |
1040 | int pid = lwpid_of (thr); | |
da84f473 PA |
1041 | |
1042 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1043 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1044 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1045 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1046 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1047 | per process, not one for each thread. But since we still support | |
1048 | linuxthreads, and we also support debugging programs using raw | |
1049 | clone without CLONE_THREAD, we send one for each thread. For | |
1050 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
1051 | about some old kernels where PTRACE_KILL might work better | |
1052 | (dubious if there are any such, but that's why it's paranoia), so | |
1053 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
1054 | everywhere. */ | |
1055 | ||
1056 | errno = 0; | |
69ff6be5 | 1057 | kill_lwp (pid, SIGKILL); |
da84f473 | 1058 | if (debug_threads) |
ce9e3fe7 PA |
1059 | { |
1060 | int save_errno = errno; | |
1061 | ||
1062 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1063 | target_pid_to_str (ptid_of (thr)), | |
1064 | save_errno ? strerror (save_errno) : "OK"); | |
1065 | } | |
da84f473 PA |
1066 | |
1067 | errno = 0; | |
b8e1b30e | 1068 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1069 | if (debug_threads) |
ce9e3fe7 PA |
1070 | { |
1071 | int save_errno = errno; | |
1072 | ||
1073 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1074 | target_pid_to_str (ptid_of (thr)), | |
1075 | save_errno ? strerror (save_errno) : "OK"); | |
1076 | } | |
da84f473 PA |
1077 | } |
1078 | ||
e76126e8 PA |
1079 | /* Kill LWP and wait for it to die. */ |
1080 | ||
1081 | static void | |
1082 | kill_wait_lwp (struct lwp_info *lwp) | |
1083 | { | |
1084 | struct thread_info *thr = get_lwp_thread (lwp); | |
1085 | int pid = ptid_get_pid (ptid_of (thr)); | |
1086 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
1087 | int wstat; | |
1088 | int res; | |
1089 | ||
1090 | if (debug_threads) | |
1091 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1092 | ||
1093 | do | |
1094 | { | |
1095 | linux_kill_one_lwp (lwp); | |
1096 | ||
1097 | /* Make sure it died. Notes: | |
1098 | ||
1099 | - The loop is most likely unnecessary. | |
1100 | ||
1101 | - We don't use linux_wait_for_event as that could delete lwps | |
1102 | while we're iterating over them. We're not interested in | |
1103 | any pending status at this point, only in making sure all | |
1104 | wait status on the kernel side are collected until the | |
1105 | process is reaped. | |
1106 | ||
1107 | - We don't use __WALL here as the __WALL emulation relies on | |
1108 | SIGCHLD, and killing a stopped process doesn't generate | |
1109 | one, nor an exit status. | |
1110 | */ | |
1111 | res = my_waitpid (lwpid, &wstat, 0); | |
1112 | if (res == -1 && errno == ECHILD) | |
1113 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1114 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1115 | ||
586b02a9 PA |
1116 | /* Even if it was stopped, the child may have already disappeared. |
1117 | E.g., if it was killed by SIGKILL. */ | |
1118 | if (res < 0 && errno != ECHILD) | |
1119 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1120 | } |
1121 | ||
da84f473 PA |
1122 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
1123 | except the leader. */ | |
95954743 PA |
1124 | |
1125 | static int | |
da84f473 | 1126 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 1127 | { |
0d62e5e8 | 1128 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1129 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1130 | int pid = * (int *) args; |
1131 | ||
1132 | if (ptid_get_pid (entry->id) != pid) | |
1133 | return 0; | |
0d62e5e8 | 1134 | |
fd500816 DJ |
1135 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1136 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1137 | the children get a chance to be reaped, it will remain a zombie | |
1138 | forever. */ | |
95954743 | 1139 | |
d86d4aaf | 1140 | if (lwpid_of (thread) == pid) |
95954743 PA |
1141 | { |
1142 | if (debug_threads) | |
87ce2a04 DE |
1143 | debug_printf ("lkop: is last of process %s\n", |
1144 | target_pid_to_str (entry->id)); | |
95954743 PA |
1145 | return 0; |
1146 | } | |
fd500816 | 1147 | |
e76126e8 | 1148 | kill_wait_lwp (lwp); |
95954743 | 1149 | return 0; |
da6d8c04 DJ |
1150 | } |
1151 | ||
95954743 PA |
1152 | static int |
1153 | linux_kill (int pid) | |
0d62e5e8 | 1154 | { |
95954743 | 1155 | struct process_info *process; |
54a0b537 | 1156 | struct lwp_info *lwp; |
fd500816 | 1157 | |
95954743 PA |
1158 | process = find_process_pid (pid); |
1159 | if (process == NULL) | |
1160 | return -1; | |
9d606399 | 1161 | |
f9e39928 PA |
1162 | /* If we're killing a running inferior, make sure it is stopped |
1163 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1164 | stop_all_lwps (0, NULL); |
f9e39928 | 1165 | |
da84f473 | 1166 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1167 | |
54a0b537 | 1168 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1169 | thread in the list, so do so now. */ |
95954743 | 1170 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1171 | |
784867a5 | 1172 | if (lwp == NULL) |
fd500816 | 1173 | { |
784867a5 | 1174 | if (debug_threads) |
d86d4aaf DE |
1175 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1176 | pid); | |
784867a5 JK |
1177 | } |
1178 | else | |
e76126e8 | 1179 | kill_wait_lwp (lwp); |
2d717e4f | 1180 | |
8336d594 | 1181 | the_target->mourn (process); |
f9e39928 PA |
1182 | |
1183 | /* Since we presently can only stop all lwps of all processes, we | |
1184 | need to unstop lwps of other processes. */ | |
7984d532 | 1185 | unstop_all_lwps (0, NULL); |
95954743 | 1186 | return 0; |
0d62e5e8 DJ |
1187 | } |
1188 | ||
9b224c5e PA |
1189 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1190 | signal the thread last stopped for, which we need to deliver to the | |
1191 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1192 | ||
1193 | static int | |
1194 | get_detach_signal (struct thread_info *thread) | |
1195 | { | |
a493e3e2 | 1196 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1197 | int status; |
1198 | struct lwp_info *lp = get_thread_lwp (thread); | |
1199 | ||
1200 | if (lp->status_pending_p) | |
1201 | status = lp->status_pending; | |
1202 | else | |
1203 | { | |
1204 | /* If the thread had been suspended by gdbserver, and it stopped | |
1205 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1206 | want to deliver that SIGSTOP. */ | |
1207 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1208 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1209 | return 0; |
1210 | ||
1211 | /* Otherwise, we may need to deliver the signal we | |
1212 | intercepted. */ | |
1213 | status = lp->last_status; | |
1214 | } | |
1215 | ||
1216 | if (!WIFSTOPPED (status)) | |
1217 | { | |
1218 | if (debug_threads) | |
87ce2a04 | 1219 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1220 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1221 | return 0; |
1222 | } | |
1223 | ||
1224 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1225 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1226 | { |
1227 | if (debug_threads) | |
87ce2a04 DE |
1228 | debug_printf ("GPS: lwp %s had stopped with extended " |
1229 | "status: no pending signal\n", | |
d86d4aaf | 1230 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1231 | return 0; |
1232 | } | |
1233 | ||
2ea28649 | 1234 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1235 | |
1236 | if (program_signals_p && !program_signals[signo]) | |
1237 | { | |
1238 | if (debug_threads) | |
87ce2a04 | 1239 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1240 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1241 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1242 | return 0; |
1243 | } | |
1244 | else if (!program_signals_p | |
1245 | /* If we have no way to know which signals GDB does not | |
1246 | want to have passed to the program, assume | |
1247 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1248 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1249 | { |
1250 | if (debug_threads) | |
87ce2a04 DE |
1251 | debug_printf ("GPS: lwp %s had signal %s, " |
1252 | "but we don't know if we should pass it. " | |
1253 | "Default to not.\n", | |
d86d4aaf | 1254 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1255 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1256 | return 0; |
1257 | } | |
1258 | else | |
1259 | { | |
1260 | if (debug_threads) | |
87ce2a04 | 1261 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1262 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1263 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1264 | |
1265 | return WSTOPSIG (status); | |
1266 | } | |
1267 | } | |
1268 | ||
95954743 PA |
1269 | static int |
1270 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1271 | { |
1272 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1273 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1274 | int pid = * (int *) args; |
9b224c5e | 1275 | int sig; |
95954743 PA |
1276 | |
1277 | if (ptid_get_pid (entry->id) != pid) | |
1278 | return 0; | |
6ad8ae5c | 1279 | |
9b224c5e | 1280 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1281 | if (lwp->stop_expected) |
ae13219e | 1282 | { |
9b224c5e | 1283 | if (debug_threads) |
87ce2a04 | 1284 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1285 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1286 | |
d86d4aaf | 1287 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1288 | lwp->stop_expected = 0; |
ae13219e DJ |
1289 | } |
1290 | ||
1291 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1292 | regcache_invalidate_thread (thread); |
ae13219e | 1293 | |
9b224c5e PA |
1294 | /* Pass on any pending signal for this thread. */ |
1295 | sig = get_detach_signal (thread); | |
1296 | ||
ae13219e | 1297 | /* Finally, let it resume. */ |
82bfbe7e PA |
1298 | if (the_low_target.prepare_to_resume != NULL) |
1299 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1300 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1301 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1302 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1303 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1304 | strerror (errno)); |
bd99dc85 PA |
1305 | |
1306 | delete_lwp (lwp); | |
95954743 | 1307 | return 0; |
6ad8ae5c DJ |
1308 | } |
1309 | ||
95954743 PA |
1310 | static int |
1311 | linux_detach (int pid) | |
1312 | { | |
1313 | struct process_info *process; | |
1314 | ||
1315 | process = find_process_pid (pid); | |
1316 | if (process == NULL) | |
1317 | return -1; | |
1318 | ||
f9e39928 PA |
1319 | /* Stop all threads before detaching. First, ptrace requires that |
1320 | the thread is stopped to sucessfully detach. Second, thread_db | |
1321 | may need to uninstall thread event breakpoints from memory, which | |
1322 | only works with a stopped process anyway. */ | |
7984d532 | 1323 | stop_all_lwps (0, NULL); |
f9e39928 | 1324 | |
ca5c370d | 1325 | #ifdef USE_THREAD_DB |
8336d594 | 1326 | thread_db_detach (process); |
ca5c370d PA |
1327 | #endif |
1328 | ||
fa593d66 PA |
1329 | /* Stabilize threads (move out of jump pads). */ |
1330 | stabilize_threads (); | |
1331 | ||
95954743 | 1332 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1333 | |
1334 | the_target->mourn (process); | |
f9e39928 PA |
1335 | |
1336 | /* Since we presently can only stop all lwps of all processes, we | |
1337 | need to unstop lwps of other processes. */ | |
7984d532 | 1338 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1339 | return 0; |
1340 | } | |
1341 | ||
1342 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1343 | ||
1344 | static int | |
1345 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1346 | { | |
d86d4aaf DE |
1347 | struct thread_info *thread = (struct thread_info *) entry; |
1348 | struct lwp_info *lwp = get_thread_lwp (thread); | |
f9e39928 PA |
1349 | struct process_info *process = proc; |
1350 | ||
d86d4aaf | 1351 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1352 | delete_lwp (lwp); |
1353 | ||
dd6953e1 | 1354 | return 0; |
6ad8ae5c DJ |
1355 | } |
1356 | ||
8336d594 PA |
1357 | static void |
1358 | linux_mourn (struct process_info *process) | |
1359 | { | |
1360 | struct process_info_private *priv; | |
1361 | ||
1362 | #ifdef USE_THREAD_DB | |
1363 | thread_db_mourn (process); | |
1364 | #endif | |
1365 | ||
d86d4aaf | 1366 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1367 | |
8336d594 | 1368 | /* Freeing all private data. */ |
fe978cb0 | 1369 | priv = process->priv; |
8336d594 PA |
1370 | free (priv->arch_private); |
1371 | free (priv); | |
fe978cb0 | 1372 | process->priv = NULL; |
505106cd PA |
1373 | |
1374 | remove_process (process); | |
8336d594 PA |
1375 | } |
1376 | ||
444d6139 | 1377 | static void |
95954743 | 1378 | linux_join (int pid) |
444d6139 | 1379 | { |
444d6139 PA |
1380 | int status, ret; |
1381 | ||
1382 | do { | |
95954743 | 1383 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1384 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1385 | break; | |
1386 | } while (ret != -1 || errno != ECHILD); | |
1387 | } | |
1388 | ||
6ad8ae5c | 1389 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1390 | static int |
95954743 | 1391 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1392 | { |
95954743 PA |
1393 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1394 | ||
1395 | /* We assume we always know if a thread exits. If a whole process | |
1396 | exited but we still haven't been able to report it to GDB, we'll | |
1397 | hold on to the last lwp of the dead process. */ | |
1398 | if (lwp != NULL) | |
1399 | return !lwp->dead; | |
0d62e5e8 DJ |
1400 | else |
1401 | return 0; | |
1402 | } | |
1403 | ||
582511be PA |
1404 | /* Return 1 if this lwp still has an interesting status pending. If |
1405 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1406 | false. */ | |
1407 | ||
1408 | static int | |
1409 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1410 | { | |
1411 | struct lwp_info *lp = get_thread_lwp (thread); | |
1412 | ||
1413 | if (!lp->status_pending_p) | |
1414 | return 0; | |
1415 | ||
1416 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1417 | report any status pending the LWP may have. */ | |
1418 | if (thread->last_resume_kind == resume_stop | |
1419 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
1420 | return 0; | |
1421 | ||
1422 | if (thread->last_resume_kind != resume_stop | |
15c66dd6 PA |
1423 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1424 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1425 | { |
1426 | struct thread_info *saved_thread; | |
1427 | CORE_ADDR pc; | |
1428 | int discard = 0; | |
1429 | ||
1430 | gdb_assert (lp->last_status != 0); | |
1431 | ||
1432 | pc = get_pc (lp); | |
1433 | ||
1434 | saved_thread = current_thread; | |
1435 | current_thread = thread; | |
1436 | ||
1437 | if (pc != lp->stop_pc) | |
1438 | { | |
1439 | if (debug_threads) | |
1440 | debug_printf ("PC of %ld changed\n", | |
1441 | lwpid_of (thread)); | |
1442 | discard = 1; | |
1443 | } | |
3e572f71 PA |
1444 | |
1445 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1446 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1447 | && !(*the_low_target.breakpoint_at) (pc)) |
1448 | { | |
1449 | if (debug_threads) | |
1450 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1451 | lwpid_of (thread)); | |
1452 | discard = 1; | |
1453 | } | |
15c66dd6 | 1454 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1455 | && !hardware_breakpoint_inserted_here (pc)) |
1456 | { | |
1457 | if (debug_threads) | |
1458 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1459 | lwpid_of (thread)); | |
1460 | discard = 1; | |
1461 | } | |
3e572f71 | 1462 | #endif |
582511be PA |
1463 | |
1464 | current_thread = saved_thread; | |
1465 | ||
1466 | if (discard) | |
1467 | { | |
1468 | if (debug_threads) | |
1469 | debug_printf ("discarding pending breakpoint status\n"); | |
1470 | lp->status_pending_p = 0; | |
1471 | return 0; | |
1472 | } | |
1473 | } | |
1474 | ||
1475 | return 1; | |
1476 | } | |
1477 | ||
6bf5e0ba | 1478 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1479 | static int |
d50171e4 | 1480 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1481 | { |
d86d4aaf | 1482 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1483 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1484 | ptid_t ptid = * (ptid_t *) arg; |
1485 | ||
1486 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1487 | or a specific LWP. */ |
1488 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1489 | return 0; |
0d62e5e8 | 1490 | |
582511be PA |
1491 | if (lp->status_pending_p |
1492 | && !thread_still_has_status_pending_p (thread)) | |
1493 | { | |
1494 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1495 | return 0; | |
1496 | } | |
0d62e5e8 | 1497 | |
582511be | 1498 | return lp->status_pending_p; |
0d62e5e8 DJ |
1499 | } |
1500 | ||
95954743 PA |
1501 | static int |
1502 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1503 | { | |
1504 | ptid_t ptid = *(ptid_t *) data; | |
1505 | int lwp; | |
1506 | ||
1507 | if (ptid_get_lwp (ptid) != 0) | |
1508 | lwp = ptid_get_lwp (ptid); | |
1509 | else | |
1510 | lwp = ptid_get_pid (ptid); | |
1511 | ||
1512 | if (ptid_get_lwp (entry->id) == lwp) | |
1513 | return 1; | |
1514 | ||
1515 | return 0; | |
1516 | } | |
1517 | ||
1518 | struct lwp_info * | |
1519 | find_lwp_pid (ptid_t ptid) | |
1520 | { | |
d86d4aaf DE |
1521 | struct inferior_list_entry *thread |
1522 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1523 | ||
1524 | if (thread == NULL) | |
1525 | return NULL; | |
1526 | ||
1527 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1528 | } |
1529 | ||
fa96cb38 | 1530 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1531 | |
fa96cb38 PA |
1532 | static int |
1533 | num_lwps (int pid) | |
1534 | { | |
1535 | struct inferior_list_entry *inf, *tmp; | |
1536 | int count = 0; | |
0d62e5e8 | 1537 | |
fa96cb38 | 1538 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1539 | { |
fa96cb38 PA |
1540 | if (ptid_get_pid (inf->id) == pid) |
1541 | count++; | |
24a09b5f | 1542 | } |
3aee8918 | 1543 | |
fa96cb38 PA |
1544 | return count; |
1545 | } | |
d61ddec4 | 1546 | |
6d4ee8c6 GB |
1547 | /* The arguments passed to iterate_over_lwps. */ |
1548 | ||
1549 | struct iterate_over_lwps_args | |
1550 | { | |
1551 | /* The FILTER argument passed to iterate_over_lwps. */ | |
1552 | ptid_t filter; | |
1553 | ||
1554 | /* The CALLBACK argument passed to iterate_over_lwps. */ | |
1555 | iterate_over_lwps_ftype *callback; | |
1556 | ||
1557 | /* The DATA argument passed to iterate_over_lwps. */ | |
1558 | void *data; | |
1559 | }; | |
1560 | ||
1561 | /* Callback for find_inferior used by iterate_over_lwps to filter | |
1562 | calls to the callback supplied to that function. Returning a | |
1563 | nonzero value causes find_inferiors to stop iterating and return | |
1564 | the current inferior_list_entry. Returning zero indicates that | |
1565 | find_inferiors should continue iterating. */ | |
1566 | ||
1567 | static int | |
1568 | iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p) | |
1569 | { | |
1570 | struct iterate_over_lwps_args *args | |
1571 | = (struct iterate_over_lwps_args *) args_p; | |
1572 | ||
1573 | if (ptid_match (entry->id, args->filter)) | |
1574 | { | |
1575 | struct thread_info *thr = (struct thread_info *) entry; | |
1576 | struct lwp_info *lwp = get_thread_lwp (thr); | |
1577 | ||
1578 | return (*args->callback) (lwp, args->data); | |
1579 | } | |
1580 | ||
1581 | return 0; | |
1582 | } | |
1583 | ||
1584 | /* See nat/linux-nat.h. */ | |
1585 | ||
1586 | struct lwp_info * | |
1587 | iterate_over_lwps (ptid_t filter, | |
1588 | iterate_over_lwps_ftype callback, | |
1589 | void *data) | |
1590 | { | |
1591 | struct iterate_over_lwps_args args = {filter, callback, data}; | |
1592 | struct inferior_list_entry *entry; | |
1593 | ||
1594 | entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args); | |
1595 | if (entry == NULL) | |
1596 | return NULL; | |
1597 | ||
1598 | return get_thread_lwp ((struct thread_info *) entry); | |
1599 | } | |
1600 | ||
fa96cb38 PA |
1601 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1602 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1603 | |
fa96cb38 PA |
1604 | static void |
1605 | check_zombie_leaders (void) | |
1606 | { | |
1607 | struct process_info *proc, *tmp; | |
c3adc08c | 1608 | |
fa96cb38 | 1609 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1610 | { |
fa96cb38 PA |
1611 | pid_t leader_pid = pid_of (proc); |
1612 | struct lwp_info *leader_lp; | |
c3adc08c | 1613 | |
fa96cb38 | 1614 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1615 | |
fa96cb38 PA |
1616 | if (debug_threads) |
1617 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1618 | "num_lwps=%d, zombie=%d\n", | |
1619 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1620 | linux_proc_pid_is_zombie (leader_pid)); | |
1621 | ||
1622 | if (leader_lp != NULL | |
1623 | /* Check if there are other threads in the group, as we may | |
1624 | have raced with the inferior simply exiting. */ | |
1625 | && !last_thread_of_process_p (leader_pid) | |
1626 | && linux_proc_pid_is_zombie (leader_pid)) | |
1627 | { | |
1628 | /* A leader zombie can mean one of two things: | |
1629 | ||
1630 | - It exited, and there's an exit status pending | |
1631 | available, or only the leader exited (not the whole | |
1632 | program). In the latter case, we can't waitpid the | |
1633 | leader's exit status until all other threads are gone. | |
1634 | ||
1635 | - There are 3 or more threads in the group, and a thread | |
1636 | other than the leader exec'd. On an exec, the Linux | |
1637 | kernel destroys all other threads (except the execing | |
1638 | one) in the thread group, and resets the execing thread's | |
1639 | tid to the tgid. No exit notification is sent for the | |
1640 | execing thread -- from the ptracer's perspective, it | |
1641 | appears as though the execing thread just vanishes. | |
1642 | Until we reap all other threads except the leader and the | |
1643 | execing thread, the leader will be zombie, and the | |
1644 | execing thread will be in `D (disc sleep)'. As soon as | |
1645 | all other threads are reaped, the execing thread changes | |
1646 | it's tid to the tgid, and the previous (zombie) leader | |
1647 | vanishes, giving place to the "new" leader. We could try | |
1648 | distinguishing the exit and exec cases, by waiting once | |
1649 | more, and seeing if something comes out, but it doesn't | |
1650 | sound useful. The previous leader _does_ go away, and | |
1651 | we'll re-add the new one once we see the exec event | |
1652 | (which is just the same as what would happen if the | |
1653 | previous leader did exit voluntarily before some other | |
1654 | thread execs). */ | |
c3adc08c | 1655 | |
fa96cb38 PA |
1656 | if (debug_threads) |
1657 | fprintf (stderr, | |
1658 | "CZL: Thread group leader %d zombie " | |
1659 | "(it exited, or another thread execd).\n", | |
1660 | leader_pid); | |
c3adc08c | 1661 | |
fa96cb38 | 1662 | delete_lwp (leader_lp); |
c3adc08c PA |
1663 | } |
1664 | } | |
fa96cb38 | 1665 | } |
c3adc08c | 1666 | |
fa96cb38 PA |
1667 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1668 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1669 | |
fa96cb38 PA |
1670 | static int |
1671 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1672 | { | |
1673 | struct thread_info *thr = (struct thread_info *) entry; | |
1674 | struct lwp_info *lwp; | |
1675 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1676 | |
fa96cb38 PA |
1677 | if (!ptid_match (ptid_of (thr), filter)) |
1678 | return 0; | |
bd99dc85 | 1679 | |
fa96cb38 PA |
1680 | lwp = get_thread_lwp (thr); |
1681 | if (!lwp->stopped) | |
1682 | return 1; | |
1683 | ||
1684 | return 0; | |
0d62e5e8 | 1685 | } |
611cb4a5 | 1686 | |
219f2f23 PA |
1687 | /* This function should only be called if the LWP got a SIGTRAP. |
1688 | ||
1689 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1690 | event was handled, 0 otherwise. */ | |
1691 | ||
1692 | static int | |
1693 | handle_tracepoints (struct lwp_info *lwp) | |
1694 | { | |
1695 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1696 | int tpoint_related_event = 0; | |
1697 | ||
582511be PA |
1698 | gdb_assert (lwp->suspended == 0); |
1699 | ||
7984d532 PA |
1700 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1701 | uninsert tracepoints. To do this, we temporarily pause all | |
1702 | threads, unpatch away, and then unpause threads. We need to make | |
1703 | sure the unpausing doesn't resume LWP too. */ | |
1704 | lwp->suspended++; | |
1705 | ||
219f2f23 PA |
1706 | /* And we need to be sure that any all-threads-stopping doesn't try |
1707 | to move threads out of the jump pads, as it could deadlock the | |
1708 | inferior (LWP could be in the jump pad, maybe even holding the | |
1709 | lock.) */ | |
1710 | ||
1711 | /* Do any necessary step collect actions. */ | |
1712 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1713 | ||
fa593d66 PA |
1714 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1715 | ||
219f2f23 PA |
1716 | /* See if we just hit a tracepoint and do its main collect |
1717 | actions. */ | |
1718 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1719 | ||
7984d532 PA |
1720 | lwp->suspended--; |
1721 | ||
1722 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1723 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1724 | |
219f2f23 PA |
1725 | if (tpoint_related_event) |
1726 | { | |
1727 | if (debug_threads) | |
87ce2a04 | 1728 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1729 | return 1; |
1730 | } | |
1731 | ||
1732 | return 0; | |
1733 | } | |
1734 | ||
fa593d66 PA |
1735 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1736 | fast tracepoint. */ | |
1737 | ||
1738 | static int | |
1739 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1740 | struct fast_tpoint_collect_status *status) | |
1741 | { | |
1742 | CORE_ADDR thread_area; | |
d86d4aaf | 1743 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1744 | |
1745 | if (the_low_target.get_thread_area == NULL) | |
1746 | return 0; | |
1747 | ||
1748 | /* Get the thread area address. This is used to recognize which | |
1749 | thread is which when tracing with the in-process agent library. | |
1750 | We don't read anything from the address, and treat it as opaque; | |
1751 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1752 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1753 | return 0; |
1754 | ||
1755 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1756 | } | |
1757 | ||
1758 | /* The reason we resume in the caller, is because we want to be able | |
1759 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1760 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1761 | refuses to resume. */ | |
1762 | ||
1763 | static int | |
1764 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1765 | { | |
0bfdf32f | 1766 | struct thread_info *saved_thread; |
fa593d66 | 1767 | |
0bfdf32f GB |
1768 | saved_thread = current_thread; |
1769 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1770 | |
1771 | if ((wstat == NULL | |
1772 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1773 | && supports_fast_tracepoints () | |
58b4daa5 | 1774 | && agent_loaded_p ()) |
fa593d66 PA |
1775 | { |
1776 | struct fast_tpoint_collect_status status; | |
1777 | int r; | |
1778 | ||
1779 | if (debug_threads) | |
87ce2a04 DE |
1780 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1781 | "jump pad.\n", | |
0bfdf32f | 1782 | lwpid_of (current_thread)); |
fa593d66 PA |
1783 | |
1784 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1785 | ||
1786 | if (wstat == NULL | |
1787 | || (WSTOPSIG (*wstat) != SIGILL | |
1788 | && WSTOPSIG (*wstat) != SIGFPE | |
1789 | && WSTOPSIG (*wstat) != SIGSEGV | |
1790 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1791 | { | |
1792 | lwp->collecting_fast_tracepoint = r; | |
1793 | ||
1794 | if (r != 0) | |
1795 | { | |
1796 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1797 | { | |
1798 | /* Haven't executed the original instruction yet. | |
1799 | Set breakpoint there, and wait till it's hit, | |
1800 | then single-step until exiting the jump pad. */ | |
1801 | lwp->exit_jump_pad_bkpt | |
1802 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1803 | } | |
1804 | ||
1805 | if (debug_threads) | |
87ce2a04 DE |
1806 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1807 | "the jump pad...it does\n", | |
0bfdf32f GB |
1808 | lwpid_of (current_thread)); |
1809 | current_thread = saved_thread; | |
fa593d66 PA |
1810 | |
1811 | return 1; | |
1812 | } | |
1813 | } | |
1814 | else | |
1815 | { | |
1816 | /* If we get a synchronous signal while collecting, *and* | |
1817 | while executing the (relocated) original instruction, | |
1818 | reset the PC to point at the tpoint address, before | |
1819 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1820 | report the signal to GDB, and pray for the best. */ | |
1821 | ||
1822 | lwp->collecting_fast_tracepoint = 0; | |
1823 | ||
1824 | if (r != 0 | |
1825 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1826 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1827 | { | |
1828 | siginfo_t info; | |
1829 | struct regcache *regcache; | |
1830 | ||
1831 | /* The si_addr on a few signals references the address | |
1832 | of the faulting instruction. Adjust that as | |
1833 | well. */ | |
1834 | if ((WSTOPSIG (*wstat) == SIGILL | |
1835 | || WSTOPSIG (*wstat) == SIGFPE | |
1836 | || WSTOPSIG (*wstat) == SIGBUS | |
1837 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 1838 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1839 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1840 | /* Final check just to make sure we don't clobber |
1841 | the siginfo of non-kernel-sent signals. */ | |
1842 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1843 | { | |
1844 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 1845 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1846 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1847 | } |
1848 | ||
0bfdf32f | 1849 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
1850 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1851 | lwp->stop_pc = status.tpoint_addr; | |
1852 | ||
1853 | /* Cancel any fast tracepoint lock this thread was | |
1854 | holding. */ | |
1855 | force_unlock_trace_buffer (); | |
1856 | } | |
1857 | ||
1858 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1859 | { | |
1860 | if (debug_threads) | |
87ce2a04 DE |
1861 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1862 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1863 | |
1864 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
1865 | |
1866 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1867 | lwp->exit_jump_pad_bkpt = NULL; | |
1868 | ||
1869 | unstop_all_lwps (1, lwp); | |
1870 | ||
1871 | gdb_assert (lwp->suspended >= 0); | |
1872 | } | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | if (debug_threads) | |
87ce2a04 DE |
1877 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1878 | "jump pad...no\n", | |
0bfdf32f | 1879 | lwpid_of (current_thread)); |
0cccb683 | 1880 | |
0bfdf32f | 1881 | current_thread = saved_thread; |
fa593d66 PA |
1882 | return 0; |
1883 | } | |
1884 | ||
1885 | /* Enqueue one signal in the "signals to report later when out of the | |
1886 | jump pad" list. */ | |
1887 | ||
1888 | static void | |
1889 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1890 | { | |
1891 | struct pending_signals *p_sig; | |
d86d4aaf | 1892 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1893 | |
1894 | if (debug_threads) | |
87ce2a04 | 1895 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 1896 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1897 | |
1898 | if (debug_threads) | |
1899 | { | |
1900 | struct pending_signals *sig; | |
1901 | ||
1902 | for (sig = lwp->pending_signals_to_report; | |
1903 | sig != NULL; | |
1904 | sig = sig->prev) | |
87ce2a04 DE |
1905 | debug_printf (" Already queued %d\n", |
1906 | sig->signal); | |
fa593d66 | 1907 | |
87ce2a04 | 1908 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1909 | } |
1910 | ||
1a981360 PA |
1911 | /* Don't enqueue non-RT signals if they are already in the deferred |
1912 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1913 | twice) */ | |
1914 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1915 | { | |
1916 | struct pending_signals *sig; | |
1917 | ||
1918 | for (sig = lwp->pending_signals_to_report; | |
1919 | sig != NULL; | |
1920 | sig = sig->prev) | |
1921 | { | |
1922 | if (sig->signal == WSTOPSIG (*wstat)) | |
1923 | { | |
1924 | if (debug_threads) | |
87ce2a04 DE |
1925 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1926 | " for LWP %ld\n", | |
1927 | sig->signal, | |
d86d4aaf | 1928 | lwpid_of (thread)); |
1a981360 PA |
1929 | return; |
1930 | } | |
1931 | } | |
1932 | } | |
1933 | ||
fa593d66 PA |
1934 | p_sig = xmalloc (sizeof (*p_sig)); |
1935 | p_sig->prev = lwp->pending_signals_to_report; | |
1936 | p_sig->signal = WSTOPSIG (*wstat); | |
1937 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
d86d4aaf | 1938 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1939 | &p_sig->info); |
fa593d66 PA |
1940 | |
1941 | lwp->pending_signals_to_report = p_sig; | |
1942 | } | |
1943 | ||
1944 | /* Dequeue one signal from the "signals to report later when out of | |
1945 | the jump pad" list. */ | |
1946 | ||
1947 | static int | |
1948 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1949 | { | |
d86d4aaf DE |
1950 | struct thread_info *thread = get_lwp_thread (lwp); |
1951 | ||
fa593d66 PA |
1952 | if (lwp->pending_signals_to_report != NULL) |
1953 | { | |
1954 | struct pending_signals **p_sig; | |
1955 | ||
1956 | p_sig = &lwp->pending_signals_to_report; | |
1957 | while ((*p_sig)->prev != NULL) | |
1958 | p_sig = &(*p_sig)->prev; | |
1959 | ||
1960 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1961 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 1962 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1963 | &(*p_sig)->info); |
fa593d66 PA |
1964 | free (*p_sig); |
1965 | *p_sig = NULL; | |
1966 | ||
1967 | if (debug_threads) | |
87ce2a04 | 1968 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 1969 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1970 | |
1971 | if (debug_threads) | |
1972 | { | |
1973 | struct pending_signals *sig; | |
1974 | ||
1975 | for (sig = lwp->pending_signals_to_report; | |
1976 | sig != NULL; | |
1977 | sig = sig->prev) | |
87ce2a04 DE |
1978 | debug_printf (" Still queued %d\n", |
1979 | sig->signal); | |
fa593d66 | 1980 | |
87ce2a04 | 1981 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
1982 | } |
1983 | ||
1984 | return 1; | |
1985 | } | |
1986 | ||
1987 | return 0; | |
1988 | } | |
1989 | ||
582511be PA |
1990 | /* Fetch the possibly triggered data watchpoint info and store it in |
1991 | CHILD. | |
d50171e4 | 1992 | |
582511be PA |
1993 | On some archs, like x86, that use debug registers to set |
1994 | watchpoints, it's possible that the way to know which watched | |
1995 | address trapped, is to check the register that is used to select | |
1996 | which address to watch. Problem is, between setting the watchpoint | |
1997 | and reading back which data address trapped, the user may change | |
1998 | the set of watchpoints, and, as a consequence, GDB changes the | |
1999 | debug registers in the inferior. To avoid reading back a stale | |
2000 | stopped-data-address when that happens, we cache in LP the fact | |
2001 | that a watchpoint trapped, and the corresponding data address, as | |
2002 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2003 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2004 | |
582511be PA |
2005 | static int |
2006 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2007 | { | |
2008 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2009 | { |
582511be | 2010 | struct thread_info *saved_thread; |
d50171e4 | 2011 | |
582511be PA |
2012 | saved_thread = current_thread; |
2013 | current_thread = get_lwp_thread (child); | |
2014 | ||
2015 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2016 | { |
15c66dd6 | 2017 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2018 | |
2019 | if (the_low_target.stopped_data_address != NULL) | |
2020 | child->stopped_data_address | |
2021 | = the_low_target.stopped_data_address (); | |
2022 | else | |
2023 | child->stopped_data_address = 0; | |
d50171e4 PA |
2024 | } |
2025 | ||
0bfdf32f | 2026 | current_thread = saved_thread; |
d50171e4 PA |
2027 | } |
2028 | ||
15c66dd6 | 2029 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2030 | } |
2031 | ||
de0d863e DB |
2032 | /* Return the ptrace options that we want to try to enable. */ |
2033 | ||
2034 | static int | |
2035 | linux_low_ptrace_options (int attached) | |
2036 | { | |
2037 | int options = 0; | |
2038 | ||
2039 | if (!attached) | |
2040 | options |= PTRACE_O_EXITKILL; | |
2041 | ||
2042 | if (report_fork_events) | |
2043 | options |= PTRACE_O_TRACEFORK; | |
2044 | ||
c269dbdb DB |
2045 | if (report_vfork_events) |
2046 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); | |
2047 | ||
de0d863e DB |
2048 | return options; |
2049 | } | |
2050 | ||
fa96cb38 PA |
2051 | /* Do low-level handling of the event, and check if we should go on |
2052 | and pass it to caller code. Return the affected lwp if we are, or | |
2053 | NULL otherwise. */ | |
2054 | ||
2055 | static struct lwp_info * | |
582511be | 2056 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2057 | { |
2058 | struct lwp_info *child; | |
2059 | struct thread_info *thread; | |
582511be | 2060 | int have_stop_pc = 0; |
fa96cb38 PA |
2061 | |
2062 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
2063 | ||
2064 | /* If we didn't find a process, one of two things presumably happened: | |
2065 | - A process we started and then detached from has exited. Ignore it. | |
2066 | - A process we are controlling has forked and the new child's stop | |
2067 | was reported to us by the kernel. Save its PID. */ | |
2068 | if (child == NULL && WIFSTOPPED (wstat)) | |
2069 | { | |
2070 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2071 | return NULL; | |
2072 | } | |
2073 | else if (child == NULL) | |
2074 | return NULL; | |
2075 | ||
2076 | thread = get_lwp_thread (child); | |
2077 | ||
2078 | child->stopped = 1; | |
2079 | ||
2080 | child->last_status = wstat; | |
2081 | ||
582511be PA |
2082 | /* Check if the thread has exited. */ |
2083 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2084 | { | |
2085 | if (debug_threads) | |
2086 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
2087 | if (num_lwps (pid_of (thread)) > 1) | |
2088 | { | |
2089 | ||
2090 | /* If there is at least one more LWP, then the exit signal was | |
2091 | not the end of the debugged application and should be | |
2092 | ignored. */ | |
2093 | delete_lwp (child); | |
2094 | return NULL; | |
2095 | } | |
2096 | else | |
2097 | { | |
2098 | /* This was the last lwp in the process. Since events are | |
2099 | serialized to GDB core, and we can't report this one | |
2100 | right now, but GDB core and the other target layers will | |
2101 | want to be notified about the exit code/signal, leave the | |
2102 | status pending for the next time we're able to report | |
2103 | it. */ | |
2104 | mark_lwp_dead (child, wstat); | |
2105 | return child; | |
2106 | } | |
2107 | } | |
2108 | ||
2109 | gdb_assert (WIFSTOPPED (wstat)); | |
2110 | ||
fa96cb38 PA |
2111 | if (WIFSTOPPED (wstat)) |
2112 | { | |
2113 | struct process_info *proc; | |
2114 | ||
c06cbd92 | 2115 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2116 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2117 | if (proc->tdesc == NULL) |
fa96cb38 | 2118 | { |
c06cbd92 YQ |
2119 | if (proc->attached) |
2120 | { | |
2121 | struct thread_info *saved_thread; | |
fa96cb38 | 2122 | |
c06cbd92 YQ |
2123 | /* This needs to happen after we have attached to the |
2124 | inferior and it is stopped for the first time, but | |
2125 | before we access any inferior registers. */ | |
2126 | saved_thread = current_thread; | |
2127 | current_thread = thread; | |
fa96cb38 | 2128 | |
c06cbd92 | 2129 | the_low_target.arch_setup (); |
fa96cb38 | 2130 | |
c06cbd92 | 2131 | current_thread = saved_thread; |
c06cbd92 YQ |
2132 | } |
2133 | else | |
2134 | { | |
2135 | /* The process is started, but GDBserver will do | |
2136 | architecture-specific setup after the program stops at | |
2137 | the first instruction. */ | |
2138 | child->status_pending_p = 1; | |
2139 | child->status_pending = wstat; | |
2140 | return child; | |
2141 | } | |
fa96cb38 PA |
2142 | } |
2143 | } | |
2144 | ||
fa96cb38 PA |
2145 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2146 | { | |
beed38b8 | 2147 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2148 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2149 | |
de0d863e | 2150 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2151 | child->must_set_ptrace_flags = 0; |
2152 | } | |
2153 | ||
582511be PA |
2154 | /* Be careful to not overwrite stop_pc until |
2155 | check_stopped_by_breakpoint is called. */ | |
fa96cb38 | 2156 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2157 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2158 | { |
582511be | 2159 | child->stop_pc = get_pc (child); |
de0d863e DB |
2160 | if (handle_extended_wait (child, wstat)) |
2161 | { | |
2162 | /* The event has been handled, so just return without | |
2163 | reporting it. */ | |
2164 | return NULL; | |
2165 | } | |
fa96cb38 PA |
2166 | } |
2167 | ||
3e572f71 PA |
2168 | /* Check first whether this was a SW/HW breakpoint before checking |
2169 | watchpoints, because at least s390 can't tell the data address of | |
2170 | hardware watchpoint hits, and returns stopped-by-watchpoint as | |
2171 | long as there's a watchpoint set. */ | |
2172 | if (WIFSTOPPED (wstat) && linux_wstatus_maybe_breakpoint (wstat)) | |
582511be PA |
2173 | { |
2174 | if (check_stopped_by_breakpoint (child)) | |
2175 | have_stop_pc = 1; | |
2176 | } | |
2177 | ||
3e572f71 PA |
2178 | /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint |
2179 | or hardware watchpoint. Check which is which if we got | |
2180 | TARGET_STOPPED_BY_HW_BREAKPOINT. */ | |
2181 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP | |
2182 | && (child->stop_reason == TARGET_STOPPED_BY_NO_REASON | |
2183 | || child->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
2184 | check_stopped_by_watchpoint (child); | |
2185 | ||
582511be PA |
2186 | if (!have_stop_pc) |
2187 | child->stop_pc = get_pc (child); | |
2188 | ||
fa96cb38 PA |
2189 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2190 | && child->stop_expected) | |
2191 | { | |
2192 | if (debug_threads) | |
2193 | debug_printf ("Expected stop.\n"); | |
2194 | child->stop_expected = 0; | |
2195 | ||
2196 | if (thread->last_resume_kind == resume_stop) | |
2197 | { | |
2198 | /* We want to report the stop to the core. Treat the | |
2199 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2200 | if (debug_threads) |
2201 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2202 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2203 | } |
2204 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2205 | { | |
2206 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2207 | pending. */ |
2bf6fb9d PA |
2208 | if (debug_threads) |
2209 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2210 | "while stopping threads.\n", | |
2211 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2212 | return NULL; |
2213 | } | |
2214 | else | |
2215 | { | |
2bf6fb9d PA |
2216 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2217 | if (debug_threads) | |
2218 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2219 | child->stepping ? "step" : "continue", | |
2220 | target_pid_to_str (ptid_of (thread))); | |
2221 | ||
fa96cb38 PA |
2222 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2223 | return NULL; | |
2224 | } | |
2225 | } | |
2226 | ||
582511be PA |
2227 | child->status_pending_p = 1; |
2228 | child->status_pending = wstat; | |
fa96cb38 PA |
2229 | return child; |
2230 | } | |
2231 | ||
20ba1ce6 PA |
2232 | /* Resume LWPs that are currently stopped without any pending status |
2233 | to report, but are resumed from the core's perspective. */ | |
2234 | ||
2235 | static void | |
2236 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
2237 | { | |
2238 | struct thread_info *thread = (struct thread_info *) entry; | |
2239 | struct lwp_info *lp = get_thread_lwp (thread); | |
2240 | ||
2241 | if (lp->stopped | |
2242 | && !lp->status_pending_p | |
2243 | && thread->last_resume_kind != resume_stop | |
2244 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
2245 | { | |
2246 | int step = thread->last_resume_kind == resume_step; | |
2247 | ||
2248 | if (debug_threads) | |
2249 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2250 | target_pid_to_str (ptid_of (thread)), | |
2251 | paddress (lp->stop_pc), | |
2252 | step); | |
2253 | ||
2254 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2255 | } | |
2256 | } | |
2257 | ||
fa96cb38 PA |
2258 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2259 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2260 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2261 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2262 | the stop status through the status pointer WSTAT. OPTIONS is | |
2263 | passed to the waitpid call. Return 0 if no event was found and | |
2264 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2265 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2266 | |
0d62e5e8 | 2267 | static int |
fa96cb38 PA |
2268 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2269 | int *wstatp, int options) | |
0d62e5e8 | 2270 | { |
d86d4aaf | 2271 | struct thread_info *event_thread; |
d50171e4 | 2272 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2273 | sigset_t block_mask, prev_mask; |
d50171e4 | 2274 | |
fa96cb38 | 2275 | retry: |
d86d4aaf DE |
2276 | /* N.B. event_thread points to the thread_info struct that contains |
2277 | event_child. Keep them in sync. */ | |
2278 | event_thread = NULL; | |
d50171e4 PA |
2279 | event_child = NULL; |
2280 | requested_child = NULL; | |
0d62e5e8 | 2281 | |
95954743 | 2282 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2283 | |
fa96cb38 | 2284 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2285 | { |
d86d4aaf | 2286 | event_thread = (struct thread_info *) |
fa96cb38 | 2287 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
2288 | if (event_thread != NULL) |
2289 | event_child = get_thread_lwp (event_thread); | |
2290 | if (debug_threads && event_thread) | |
2291 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2292 | } |
fa96cb38 | 2293 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2294 | { |
fa96cb38 | 2295 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2296 | |
bde24c0a | 2297 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2298 | && requested_child->status_pending_p |
2299 | && requested_child->collecting_fast_tracepoint) | |
2300 | { | |
2301 | enqueue_one_deferred_signal (requested_child, | |
2302 | &requested_child->status_pending); | |
2303 | requested_child->status_pending_p = 0; | |
2304 | requested_child->status_pending = 0; | |
2305 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2306 | } | |
2307 | ||
2308 | if (requested_child->suspended | |
2309 | && requested_child->status_pending_p) | |
38e08fca GB |
2310 | { |
2311 | internal_error (__FILE__, __LINE__, | |
2312 | "requesting an event out of a" | |
2313 | " suspended child?"); | |
2314 | } | |
fa593d66 | 2315 | |
d50171e4 | 2316 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2317 | { |
2318 | event_child = requested_child; | |
2319 | event_thread = get_lwp_thread (event_child); | |
2320 | } | |
0d62e5e8 | 2321 | } |
611cb4a5 | 2322 | |
0d62e5e8 DJ |
2323 | if (event_child != NULL) |
2324 | { | |
bd99dc85 | 2325 | if (debug_threads) |
87ce2a04 | 2326 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2327 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2328 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2329 | event_child->status_pending_p = 0; |
2330 | event_child->status_pending = 0; | |
0bfdf32f | 2331 | current_thread = event_thread; |
d86d4aaf | 2332 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2333 | } |
2334 | ||
fa96cb38 PA |
2335 | /* But if we don't find a pending event, we'll have to wait. |
2336 | ||
2337 | We only enter this loop if no process has a pending wait status. | |
2338 | Thus any action taken in response to a wait status inside this | |
2339 | loop is responding as soon as we detect the status, not after any | |
2340 | pending events. */ | |
d8301ad1 | 2341 | |
fa96cb38 PA |
2342 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2343 | all signals while here. */ | |
2344 | sigfillset (&block_mask); | |
2345 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2346 | ||
582511be PA |
2347 | /* Always pull all events out of the kernel. We'll randomly select |
2348 | an event LWP out of all that have events, to prevent | |
2349 | starvation. */ | |
fa96cb38 | 2350 | while (event_child == NULL) |
0d62e5e8 | 2351 | { |
fa96cb38 | 2352 | pid_t ret = 0; |
0d62e5e8 | 2353 | |
fa96cb38 PA |
2354 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2355 | quirks: | |
0d62e5e8 | 2356 | |
fa96cb38 PA |
2357 | - If the thread group leader exits while other threads in the |
2358 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2359 | waitpid won't return an exit status until the other threads | |
2360 | in the group are reaped. | |
611cb4a5 | 2361 | |
fa96cb38 PA |
2362 | - When a non-leader thread execs, that thread just vanishes |
2363 | without reporting an exit (so we'd hang if we waited for it | |
2364 | explicitly in that case). The exec event is reported to | |
2365 | the TGID pid (although we don't currently enable exec | |
2366 | events). */ | |
2367 | errno = 0; | |
2368 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2369 | |
fa96cb38 PA |
2370 | if (debug_threads) |
2371 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2372 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2373 | |
fa96cb38 | 2374 | if (ret > 0) |
0d62e5e8 | 2375 | { |
89be2091 | 2376 | if (debug_threads) |
bd99dc85 | 2377 | { |
fa96cb38 PA |
2378 | debug_printf ("LLW: waitpid %ld received %s\n", |
2379 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2380 | } |
89be2091 | 2381 | |
582511be PA |
2382 | /* Filter all events. IOW, leave all events pending. We'll |
2383 | randomly select an event LWP out of all that have events | |
2384 | below. */ | |
2385 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2386 | /* Retry until nothing comes out of waitpid. A single |
2387 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2388 | continue; |
2389 | } | |
2390 | ||
20ba1ce6 PA |
2391 | /* Now that we've pulled all events out of the kernel, resume |
2392 | LWPs that don't have an interesting event to report. */ | |
2393 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2394 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2395 | ||
2396 | /* ... and find an LWP with a status to report to the core, if | |
2397 | any. */ | |
582511be PA |
2398 | event_thread = (struct thread_info *) |
2399 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2400 | if (event_thread != NULL) | |
2401 | { | |
2402 | event_child = get_thread_lwp (event_thread); | |
2403 | *wstatp = event_child->status_pending; | |
2404 | event_child->status_pending_p = 0; | |
2405 | event_child->status_pending = 0; | |
2406 | break; | |
2407 | } | |
2408 | ||
fa96cb38 PA |
2409 | /* Check for zombie thread group leaders. Those can't be reaped |
2410 | until all other threads in the thread group are. */ | |
2411 | check_zombie_leaders (); | |
2412 | ||
2413 | /* If there are no resumed children left in the set of LWPs we | |
2414 | want to wait for, bail. We can't just block in | |
2415 | waitpid/sigsuspend, because lwps might have been left stopped | |
2416 | in trace-stop state, and we'd be stuck forever waiting for | |
2417 | their status to change (which would only happen if we resumed | |
2418 | them). Even if WNOHANG is set, this return code is preferred | |
2419 | over 0 (below), as it is more detailed. */ | |
2420 | if ((find_inferior (&all_threads, | |
2421 | not_stopped_callback, | |
2422 | &wait_ptid) == NULL)) | |
a6dbe5df | 2423 | { |
fa96cb38 PA |
2424 | if (debug_threads) |
2425 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2426 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2427 | return -1; | |
a6dbe5df PA |
2428 | } |
2429 | ||
fa96cb38 PA |
2430 | /* No interesting event to report to the caller. */ |
2431 | if ((options & WNOHANG)) | |
24a09b5f | 2432 | { |
fa96cb38 PA |
2433 | if (debug_threads) |
2434 | debug_printf ("WNOHANG set, no event found\n"); | |
2435 | ||
2436 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2437 | return 0; | |
24a09b5f DJ |
2438 | } |
2439 | ||
fa96cb38 PA |
2440 | /* Block until we get an event reported with SIGCHLD. */ |
2441 | if (debug_threads) | |
2442 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2443 | |
fa96cb38 PA |
2444 | sigsuspend (&prev_mask); |
2445 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2446 | goto retry; | |
2447 | } | |
d50171e4 | 2448 | |
fa96cb38 | 2449 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2450 | |
0bfdf32f | 2451 | current_thread = event_thread; |
d50171e4 | 2452 | |
fa96cb38 PA |
2453 | /* Check for thread exit. */ |
2454 | if (! WIFSTOPPED (*wstatp)) | |
2455 | { | |
2456 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2457 | ||
2458 | if (debug_threads) | |
2459 | debug_printf ("LWP %d is the last lwp of process. " | |
2460 | "Process %ld exiting.\n", | |
2461 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2462 | return lwpid_of (event_thread); |
611cb4a5 | 2463 | } |
0d62e5e8 | 2464 | |
fa96cb38 PA |
2465 | return lwpid_of (event_thread); |
2466 | } | |
2467 | ||
2468 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2469 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2470 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2471 | the stop status through the status pointer WSTAT. OPTIONS is | |
2472 | passed to the waitpid call. Return 0 if no event was found and | |
2473 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2474 | was found. Return the PID of the stopped child otherwise. */ | |
2475 | ||
2476 | static int | |
2477 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2478 | { | |
2479 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2480 | } |
2481 | ||
6bf5e0ba PA |
2482 | /* Count the LWP's that have had events. */ |
2483 | ||
2484 | static int | |
2485 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2486 | { | |
d86d4aaf | 2487 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2488 | struct lwp_info *lp = get_thread_lwp (thread); |
6bf5e0ba PA |
2489 | int *count = data; |
2490 | ||
2491 | gdb_assert (count != NULL); | |
2492 | ||
582511be | 2493 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2494 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2495 | && lp->status_pending_p) |
6bf5e0ba PA |
2496 | (*count)++; |
2497 | ||
2498 | return 0; | |
2499 | } | |
2500 | ||
2501 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2502 | ||
2503 | static int | |
2504 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2505 | { | |
d86d4aaf DE |
2506 | struct thread_info *thread = (struct thread_info *) entry; |
2507 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2508 | |
8336d594 PA |
2509 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2510 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2511 | && lp->status_pending_p) |
2512 | return 1; | |
2513 | else | |
2514 | return 0; | |
2515 | } | |
2516 | ||
b90fc188 | 2517 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2518 | |
2519 | static int | |
2520 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2521 | { | |
d86d4aaf | 2522 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2523 | struct lwp_info *lp = get_thread_lwp (thread); |
6bf5e0ba PA |
2524 | int *selector = data; |
2525 | ||
2526 | gdb_assert (selector != NULL); | |
2527 | ||
582511be | 2528 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2529 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2530 | && lp->status_pending_p) |
6bf5e0ba PA |
2531 | if ((*selector)-- == 0) |
2532 | return 1; | |
2533 | ||
2534 | return 0; | |
2535 | } | |
2536 | ||
6bf5e0ba PA |
2537 | /* Select one LWP out of those that have events pending. */ |
2538 | ||
2539 | static void | |
2540 | select_event_lwp (struct lwp_info **orig_lp) | |
2541 | { | |
2542 | int num_events = 0; | |
2543 | int random_selector; | |
582511be PA |
2544 | struct thread_info *event_thread = NULL; |
2545 | ||
2546 | /* In all-stop, give preference to the LWP that is being | |
2547 | single-stepped. There will be at most one, and it's the LWP that | |
2548 | the core is most interested in. If we didn't do this, then we'd | |
2549 | have to handle pending step SIGTRAPs somehow in case the core | |
2550 | later continues the previously-stepped thread, otherwise we'd | |
2551 | report the pending SIGTRAP, and the core, not having stepped the | |
2552 | thread, wouldn't understand what the trap was for, and therefore | |
2553 | would report it to the user as a random signal. */ | |
2554 | if (!non_stop) | |
6bf5e0ba | 2555 | { |
582511be PA |
2556 | event_thread |
2557 | = (struct thread_info *) find_inferior (&all_threads, | |
2558 | select_singlestep_lwp_callback, | |
2559 | NULL); | |
2560 | if (event_thread != NULL) | |
2561 | { | |
2562 | if (debug_threads) | |
2563 | debug_printf ("SEL: Select single-step %s\n", | |
2564 | target_pid_to_str (ptid_of (event_thread))); | |
2565 | } | |
6bf5e0ba | 2566 | } |
582511be | 2567 | if (event_thread == NULL) |
6bf5e0ba PA |
2568 | { |
2569 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2570 | which have had events. */ |
6bf5e0ba | 2571 | |
b90fc188 | 2572 | /* First see how many events we have. */ |
d86d4aaf | 2573 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2574 | gdb_assert (num_events > 0); |
6bf5e0ba | 2575 | |
b90fc188 PA |
2576 | /* Now randomly pick a LWP out of those that have had |
2577 | events. */ | |
6bf5e0ba PA |
2578 | random_selector = (int) |
2579 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2580 | ||
2581 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2582 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2583 | num_events, random_selector); | |
6bf5e0ba | 2584 | |
d86d4aaf DE |
2585 | event_thread |
2586 | = (struct thread_info *) find_inferior (&all_threads, | |
2587 | select_event_lwp_callback, | |
2588 | &random_selector); | |
6bf5e0ba PA |
2589 | } |
2590 | ||
d86d4aaf | 2591 | if (event_thread != NULL) |
6bf5e0ba | 2592 | { |
d86d4aaf DE |
2593 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2594 | ||
6bf5e0ba PA |
2595 | /* Switch the event LWP. */ |
2596 | *orig_lp = event_lp; | |
2597 | } | |
2598 | } | |
2599 | ||
7984d532 PA |
2600 | /* Decrement the suspend count of an LWP. */ |
2601 | ||
2602 | static int | |
2603 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2604 | { | |
d86d4aaf DE |
2605 | struct thread_info *thread = (struct thread_info *) entry; |
2606 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2607 | |
2608 | /* Ignore EXCEPT. */ | |
2609 | if (lwp == except) | |
2610 | return 0; | |
2611 | ||
2612 | lwp->suspended--; | |
2613 | ||
2614 | gdb_assert (lwp->suspended >= 0); | |
2615 | return 0; | |
2616 | } | |
2617 | ||
2618 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2619 | NULL. */ | |
2620 | ||
2621 | static void | |
2622 | unsuspend_all_lwps (struct lwp_info *except) | |
2623 | { | |
d86d4aaf | 2624 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2625 | } |
2626 | ||
fa593d66 PA |
2627 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2628 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2629 | void *data); | |
2630 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2631 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2632 | struct target_waitstatus *ourstatus, | |
2633 | int target_options); | |
2634 | ||
2635 | /* Stabilize threads (move out of jump pads). | |
2636 | ||
2637 | If a thread is midway collecting a fast tracepoint, we need to | |
2638 | finish the collection and move it out of the jump pad before | |
2639 | reporting the signal. | |
2640 | ||
2641 | This avoids recursion while collecting (when a signal arrives | |
2642 | midway, and the signal handler itself collects), which would trash | |
2643 | the trace buffer. In case the user set a breakpoint in a signal | |
2644 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2645 | Most importantly, there are certain things we can't do safely if | |
2646 | threads are stopped in a jump pad (or in its callee's). For | |
2647 | example: | |
2648 | ||
2649 | - starting a new trace run. A thread still collecting the | |
2650 | previous run, could trash the trace buffer when resumed. The trace | |
2651 | buffer control structures would have been reset but the thread had | |
2652 | no way to tell. The thread could even midway memcpy'ing to the | |
2653 | buffer, which would mean that when resumed, it would clobber the | |
2654 | trace buffer that had been set for a new run. | |
2655 | ||
2656 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2657 | safely. Say you do tstart while a thread is stopped midway while | |
2658 | collecting. When the thread is later resumed, it finishes the | |
2659 | collection, and returns to the jump pad, to execute the original | |
2660 | instruction that was under the tracepoint jump at the time the | |
2661 | older run had been started. If the jump pad had been rewritten | |
2662 | since for something else in the new run, the thread would now | |
2663 | execute the wrong / random instructions. */ | |
2664 | ||
2665 | static void | |
2666 | linux_stabilize_threads (void) | |
2667 | { | |
0bfdf32f | 2668 | struct thread_info *saved_thread; |
d86d4aaf | 2669 | struct thread_info *thread_stuck; |
fa593d66 | 2670 | |
d86d4aaf DE |
2671 | thread_stuck |
2672 | = (struct thread_info *) find_inferior (&all_threads, | |
2673 | stuck_in_jump_pad_callback, | |
2674 | NULL); | |
2675 | if (thread_stuck != NULL) | |
fa593d66 | 2676 | { |
b4d51a55 | 2677 | if (debug_threads) |
87ce2a04 | 2678 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2679 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2680 | return; |
2681 | } | |
2682 | ||
0bfdf32f | 2683 | saved_thread = current_thread; |
fa593d66 PA |
2684 | |
2685 | stabilizing_threads = 1; | |
2686 | ||
2687 | /* Kick 'em all. */ | |
d86d4aaf | 2688 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2689 | |
2690 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2691 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2692 | { |
2693 | struct target_waitstatus ourstatus; | |
2694 | struct lwp_info *lwp; | |
fa593d66 PA |
2695 | int wstat; |
2696 | ||
2697 | /* Note that we go through the full wait even loop. While | |
2698 | moving threads out of jump pad, we need to be able to step | |
2699 | over internal breakpoints and such. */ | |
32fcada3 | 2700 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2701 | |
2702 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2703 | { | |
0bfdf32f | 2704 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2705 | |
2706 | /* Lock it. */ | |
2707 | lwp->suspended++; | |
2708 | ||
a493e3e2 | 2709 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2710 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2711 | { |
2ea28649 | 2712 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2713 | enqueue_one_deferred_signal (lwp, &wstat); |
2714 | } | |
2715 | } | |
2716 | } | |
2717 | ||
d86d4aaf | 2718 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2719 | |
2720 | stabilizing_threads = 0; | |
2721 | ||
0bfdf32f | 2722 | current_thread = saved_thread; |
fa593d66 | 2723 | |
b4d51a55 | 2724 | if (debug_threads) |
fa593d66 | 2725 | { |
d86d4aaf DE |
2726 | thread_stuck |
2727 | = (struct thread_info *) find_inferior (&all_threads, | |
2728 | stuck_in_jump_pad_callback, | |
2729 | NULL); | |
2730 | if (thread_stuck != NULL) | |
87ce2a04 | 2731 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2732 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2733 | } |
2734 | } | |
2735 | ||
582511be PA |
2736 | static void async_file_mark (void); |
2737 | ||
2738 | /* Convenience function that is called when the kernel reports an | |
2739 | event that is not passed out to GDB. */ | |
2740 | ||
2741 | static ptid_t | |
2742 | ignore_event (struct target_waitstatus *ourstatus) | |
2743 | { | |
2744 | /* If we got an event, there may still be others, as a single | |
2745 | SIGCHLD can indicate more than one child stopped. This forces | |
2746 | another target_wait call. */ | |
2747 | async_file_mark (); | |
2748 | ||
2749 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2750 | return null_ptid; | |
2751 | } | |
2752 | ||
de0d863e DB |
2753 | /* Return non-zero if WAITSTATUS reflects an extended linux |
2754 | event. Otherwise, return zero. */ | |
2755 | ||
2756 | static int | |
2757 | extended_event_reported (const struct target_waitstatus *waitstatus) | |
2758 | { | |
2759 | if (waitstatus == NULL) | |
2760 | return 0; | |
2761 | ||
c269dbdb DB |
2762 | return (waitstatus->kind == TARGET_WAITKIND_FORKED |
2763 | || waitstatus->kind == TARGET_WAITKIND_VFORKED | |
2764 | || waitstatus->kind == TARGET_WAITKIND_VFORK_DONE); | |
de0d863e DB |
2765 | } |
2766 | ||
0d62e5e8 | 2767 | /* Wait for process, returns status. */ |
da6d8c04 | 2768 | |
95954743 PA |
2769 | static ptid_t |
2770 | linux_wait_1 (ptid_t ptid, | |
2771 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2772 | { |
e5f1222d | 2773 | int w; |
fc7238bb | 2774 | struct lwp_info *event_child; |
bd99dc85 | 2775 | int options; |
bd99dc85 | 2776 | int pid; |
6bf5e0ba PA |
2777 | int step_over_finished; |
2778 | int bp_explains_trap; | |
2779 | int maybe_internal_trap; | |
2780 | int report_to_gdb; | |
219f2f23 | 2781 | int trace_event; |
c2d6af84 | 2782 | int in_step_range; |
bd99dc85 | 2783 | |
87ce2a04 DE |
2784 | if (debug_threads) |
2785 | { | |
2786 | debug_enter (); | |
2787 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2788 | } | |
2789 | ||
bd99dc85 PA |
2790 | /* Translate generic target options into linux options. */ |
2791 | options = __WALL; | |
2792 | if (target_options & TARGET_WNOHANG) | |
2793 | options |= WNOHANG; | |
0d62e5e8 | 2794 | |
fa593d66 PA |
2795 | bp_explains_trap = 0; |
2796 | trace_event = 0; | |
c2d6af84 | 2797 | in_step_range = 0; |
bd99dc85 PA |
2798 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2799 | ||
6bf5e0ba PA |
2800 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2801 | pid = linux_wait_for_event (ptid, &w, options); | |
2802 | else | |
2803 | { | |
2804 | if (debug_threads) | |
87ce2a04 DE |
2805 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2806 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2807 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2808 | } | |
2809 | ||
fa96cb38 | 2810 | if (pid == 0) |
87ce2a04 | 2811 | { |
fa96cb38 PA |
2812 | gdb_assert (target_options & TARGET_WNOHANG); |
2813 | ||
87ce2a04 DE |
2814 | if (debug_threads) |
2815 | { | |
fa96cb38 PA |
2816 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2817 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2818 | debug_exit (); |
2819 | } | |
fa96cb38 PA |
2820 | |
2821 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2822 | return null_ptid; |
2823 | } | |
fa96cb38 PA |
2824 | else if (pid == -1) |
2825 | { | |
2826 | if (debug_threads) | |
2827 | { | |
2828 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2829 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2830 | debug_exit (); | |
2831 | } | |
bd99dc85 | 2832 | |
fa96cb38 PA |
2833 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2834 | return null_ptid; | |
2835 | } | |
0d62e5e8 | 2836 | |
0bfdf32f | 2837 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 2838 | |
fa96cb38 PA |
2839 | /* linux_wait_for_event only returns an exit status for the last |
2840 | child of a process. Report it. */ | |
2841 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2842 | { |
fa96cb38 | 2843 | if (WIFEXITED (w)) |
0d62e5e8 | 2844 | { |
fa96cb38 PA |
2845 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2846 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2847 | |
fa96cb38 | 2848 | if (debug_threads) |
bd99dc85 | 2849 | { |
fa96cb38 PA |
2850 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2851 | "retcode %d\n", | |
0bfdf32f | 2852 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2853 | WEXITSTATUS (w)); |
2854 | debug_exit (); | |
bd99dc85 | 2855 | } |
fa96cb38 PA |
2856 | } |
2857 | else | |
2858 | { | |
2859 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2860 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2861 | |
fa96cb38 PA |
2862 | if (debug_threads) |
2863 | { | |
2864 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2865 | "signal %d\n", | |
0bfdf32f | 2866 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2867 | WTERMSIG (w)); |
2868 | debug_exit (); | |
2869 | } | |
0d62e5e8 | 2870 | } |
fa96cb38 | 2871 | |
0bfdf32f | 2872 | return ptid_of (current_thread); |
da6d8c04 DJ |
2873 | } |
2874 | ||
8090aef2 PA |
2875 | /* If step-over executes a breakpoint instruction, it means a |
2876 | gdb/gdbserver breakpoint had been planted on top of a permanent | |
2877 | breakpoint. The PC has been adjusted by | |
2878 | check_stopped_by_breakpoint to point at the breakpoint address. | |
2879 | Advance the PC manually past the breakpoint, otherwise the | |
2880 | program would keep trapping the permanent breakpoint forever. */ | |
2881 | if (!ptid_equal (step_over_bkpt, null_ptid) | |
15c66dd6 | 2882 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) |
8090aef2 | 2883 | { |
9beb7c4e | 2884 | unsigned int increment_pc = the_low_target.breakpoint_len; |
8090aef2 PA |
2885 | |
2886 | if (debug_threads) | |
2887 | { | |
2888 | debug_printf ("step-over for %s executed software breakpoint\n", | |
2889 | target_pid_to_str (ptid_of (current_thread))); | |
2890 | } | |
2891 | ||
2892 | if (increment_pc != 0) | |
2893 | { | |
2894 | struct regcache *regcache | |
2895 | = get_thread_regcache (current_thread, 1); | |
2896 | ||
2897 | event_child->stop_pc += increment_pc; | |
2898 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2899 | ||
2900 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 2901 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
2902 | } |
2903 | } | |
2904 | ||
6bf5e0ba PA |
2905 | /* If this event was not handled before, and is not a SIGTRAP, we |
2906 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2907 | a breakpoint is inserted at the current PC. If this target does | |
2908 | not support internal breakpoints at all, we also report the | |
2909 | SIGTRAP without further processing; it's of no concern to us. */ | |
2910 | maybe_internal_trap | |
2911 | = (supports_breakpoints () | |
2912 | && (WSTOPSIG (w) == SIGTRAP | |
2913 | || ((WSTOPSIG (w) == SIGILL | |
2914 | || WSTOPSIG (w) == SIGSEGV) | |
2915 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2916 | ||
2917 | if (maybe_internal_trap) | |
2918 | { | |
2919 | /* Handle anything that requires bookkeeping before deciding to | |
2920 | report the event or continue waiting. */ | |
2921 | ||
2922 | /* First check if we can explain the SIGTRAP with an internal | |
2923 | breakpoint, or if we should possibly report the event to GDB. | |
2924 | Do this before anything that may remove or insert a | |
2925 | breakpoint. */ | |
2926 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2927 | ||
2928 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2929 | finished. If so, tweak the state machine accordingly, | |
2930 | reinsert breakpoints and delete any reinsert (software | |
2931 | single-step) breakpoints. */ | |
2932 | step_over_finished = finish_step_over (event_child); | |
2933 | ||
2934 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2935 | check_breakpoints (event_child->stop_pc); | |
2936 | ||
219f2f23 PA |
2937 | /* Handle tracepoint data collecting. This may overflow the |
2938 | trace buffer, and cause a tracing stop, removing | |
2939 | breakpoints. */ | |
2940 | trace_event = handle_tracepoints (event_child); | |
2941 | ||
6bf5e0ba PA |
2942 | if (bp_explains_trap) |
2943 | { | |
2944 | /* If we stepped or ran into an internal breakpoint, we've | |
2945 | already handled it. So next time we resume (from this | |
2946 | PC), we should step over it. */ | |
2947 | if (debug_threads) | |
87ce2a04 | 2948 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2949 | |
8b07ae33 PA |
2950 | if (breakpoint_here (event_child->stop_pc)) |
2951 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2952 | } |
2953 | } | |
2954 | else | |
2955 | { | |
2956 | /* We have some other signal, possibly a step-over dance was in | |
2957 | progress, and it should be cancelled too. */ | |
2958 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2959 | } |
2960 | ||
2961 | /* We have all the data we need. Either report the event to GDB, or | |
2962 | resume threads and keep waiting for more. */ | |
2963 | ||
2964 | /* If we're collecting a fast tracepoint, finish the collection and | |
2965 | move out of the jump pad before delivering a signal. See | |
2966 | linux_stabilize_threads. */ | |
2967 | ||
2968 | if (WIFSTOPPED (w) | |
2969 | && WSTOPSIG (w) != SIGTRAP | |
2970 | && supports_fast_tracepoints () | |
58b4daa5 | 2971 | && agent_loaded_p ()) |
fa593d66 PA |
2972 | { |
2973 | if (debug_threads) | |
87ce2a04 DE |
2974 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2975 | "to defer or adjust it.\n", | |
0bfdf32f | 2976 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2977 | |
2978 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 2979 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
2980 | && maybe_move_out_of_jump_pad (event_child, &w)) |
2981 | { | |
2982 | enqueue_one_deferred_signal (event_child, &w); | |
2983 | ||
2984 | if (debug_threads) | |
87ce2a04 | 2985 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 2986 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2987 | |
2988 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
2989 | |
2990 | return ignore_event (ourstatus); | |
fa593d66 PA |
2991 | } |
2992 | } | |
219f2f23 | 2993 | |
fa593d66 PA |
2994 | if (event_child->collecting_fast_tracepoint) |
2995 | { | |
2996 | if (debug_threads) | |
87ce2a04 DE |
2997 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
2998 | "Check if we're already there.\n", | |
0bfdf32f | 2999 | lwpid_of (current_thread), |
87ce2a04 | 3000 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3001 | |
3002 | trace_event = 1; | |
3003 | ||
3004 | event_child->collecting_fast_tracepoint | |
3005 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3006 | ||
3007 | if (event_child->collecting_fast_tracepoint != 1) | |
3008 | { | |
3009 | /* No longer need this breakpoint. */ | |
3010 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3011 | { | |
3012 | if (debug_threads) | |
87ce2a04 DE |
3013 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3014 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3015 | |
3016 | /* Other running threads could hit this breakpoint. | |
3017 | We don't handle moribund locations like GDB does, | |
3018 | instead we always pause all threads when removing | |
3019 | breakpoints, so that any step-over or | |
3020 | decr_pc_after_break adjustment is always taken | |
3021 | care of while the breakpoint is still | |
3022 | inserted. */ | |
3023 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3024 | |
3025 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3026 | event_child->exit_jump_pad_bkpt = NULL; | |
3027 | ||
3028 | unstop_all_lwps (1, event_child); | |
3029 | ||
3030 | gdb_assert (event_child->suspended >= 0); | |
3031 | } | |
3032 | } | |
3033 | ||
3034 | if (event_child->collecting_fast_tracepoint == 0) | |
3035 | { | |
3036 | if (debug_threads) | |
87ce2a04 DE |
3037 | debug_printf ("fast tracepoint finished " |
3038 | "collecting successfully.\n"); | |
fa593d66 PA |
3039 | |
3040 | /* We may have a deferred signal to report. */ | |
3041 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3042 | { | |
3043 | if (debug_threads) | |
87ce2a04 | 3044 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3045 | } |
3c11dd79 | 3046 | else |
fa593d66 | 3047 | { |
3c11dd79 | 3048 | if (debug_threads) |
87ce2a04 | 3049 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3050 | |
3051 | if (stabilizing_threads) | |
3052 | { | |
3053 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3054 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3055 | |
3056 | if (debug_threads) | |
3057 | { | |
3058 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3059 | "while stabilizing threads\n", | |
0bfdf32f | 3060 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3061 | debug_exit (); |
3062 | } | |
3063 | ||
0bfdf32f | 3064 | return ptid_of (current_thread); |
fa593d66 PA |
3065 | } |
3066 | } | |
3067 | } | |
6bf5e0ba PA |
3068 | } |
3069 | ||
e471f25b PA |
3070 | /* Check whether GDB would be interested in this event. */ |
3071 | ||
3072 | /* If GDB is not interested in this signal, don't stop other | |
3073 | threads, and don't report it to GDB. Just resume the inferior | |
3074 | right away. We do this for threading-related signals as well as | |
3075 | any that GDB specifically requested we ignore. But never ignore | |
3076 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3077 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3078 | handler. Also never ignore signals that could be caused by a |
3079 | breakpoint. */ | |
e471f25b PA |
3080 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
3081 | thread library? */ | |
3082 | if (WIFSTOPPED (w) | |
0bfdf32f | 3083 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3084 | && ( |
1a981360 | 3085 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3086 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3087 | && (WSTOPSIG (w) == __SIGRTMIN |
3088 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3089 | || | |
3090 | #endif | |
2ea28649 | 3091 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3092 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3093 | && current_thread->last_resume_kind == resume_stop) |
3094 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3095 | { |
3096 | siginfo_t info, *info_p; | |
3097 | ||
3098 | if (debug_threads) | |
87ce2a04 | 3099 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3100 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3101 | |
0bfdf32f | 3102 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3103 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3104 | info_p = &info; |
3105 | else | |
3106 | info_p = NULL; | |
3107 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3108 | WSTOPSIG (w), info_p); | |
582511be | 3109 | return ignore_event (ourstatus); |
e471f25b PA |
3110 | } |
3111 | ||
c2d6af84 PA |
3112 | /* Note that all addresses are always "out of the step range" when |
3113 | there's no range to begin with. */ | |
3114 | in_step_range = lwp_in_step_range (event_child); | |
3115 | ||
3116 | /* If GDB wanted this thread to single step, and the thread is out | |
3117 | of the step range, we always want to report the SIGTRAP, and let | |
3118 | GDB handle it. Watchpoints should always be reported. So should | |
3119 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3120 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3121 | do, we're be able to handle GDB breakpoints on top of internal | |
3122 | breakpoints, by handling the internal breakpoint and still | |
3123 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
3124 | won't see the breakpoint hit. */ | |
6bf5e0ba | 3125 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3126 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3127 | && !in_step_range) |
15c66dd6 | 3128 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
c2d6af84 | 3129 | || (!step_over_finished && !in_step_range |
493e2a69 | 3130 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 3131 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3132 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e DB |
3133 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
3134 | || extended_event_reported (&event_child->waitstatus)); | |
d3ce09f5 SS |
3135 | |
3136 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3137 | |
3138 | /* We found no reason GDB would want us to stop. We either hit one | |
3139 | of our own breakpoints, or finished an internal step GDB | |
3140 | shouldn't know about. */ | |
3141 | if (!report_to_gdb) | |
3142 | { | |
3143 | if (debug_threads) | |
3144 | { | |
3145 | if (bp_explains_trap) | |
87ce2a04 | 3146 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3147 | if (step_over_finished) |
87ce2a04 | 3148 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3149 | if (trace_event) |
87ce2a04 | 3150 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3151 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3152 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3153 | paddress (event_child->stop_pc), | |
3154 | paddress (event_child->step_range_start), | |
3155 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3156 | } |
3157 | ||
3158 | /* We're not reporting this breakpoint to GDB, so apply the | |
3159 | decr_pc_after_break adjustment to the inferior's regcache | |
3160 | ourselves. */ | |
3161 | ||
3162 | if (the_low_target.set_pc != NULL) | |
3163 | { | |
3164 | struct regcache *regcache | |
0bfdf32f | 3165 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3166 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3167 | } | |
3168 | ||
7984d532 PA |
3169 | /* We may have finished stepping over a breakpoint. If so, |
3170 | we've stopped and suspended all LWPs momentarily except the | |
3171 | stepping one. This is where we resume them all again. We're | |
3172 | going to keep waiting, so use proceed, which handles stepping | |
3173 | over the next breakpoint. */ | |
6bf5e0ba | 3174 | if (debug_threads) |
87ce2a04 | 3175 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
3176 | |
3177 | if (step_over_finished) | |
3178 | unsuspend_all_lwps (event_child); | |
3179 | ||
6bf5e0ba | 3180 | proceed_all_lwps (); |
582511be | 3181 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3182 | } |
3183 | ||
3184 | if (debug_threads) | |
3185 | { | |
ad071a30 PA |
3186 | if (extended_event_reported (&event_child->waitstatus)) |
3187 | { | |
3188 | char *str; | |
3189 | ||
3190 | str = target_waitstatus_to_string (&event_child->waitstatus); | |
3191 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", | |
3192 | lwpid_of (get_lwp_thread (event_child)), str); | |
3193 | xfree (str); | |
3194 | } | |
0bfdf32f | 3195 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3196 | { |
3197 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3198 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3199 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3200 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3201 | } |
15c66dd6 | 3202 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3203 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3204 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3205 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3206 | if (debug_threads) |
87ce2a04 | 3207 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3208 | } |
3209 | ||
3210 | /* Alright, we're going to report a stop. */ | |
3211 | ||
582511be | 3212 | if (!stabilizing_threads) |
6bf5e0ba PA |
3213 | { |
3214 | /* In all-stop, stop all threads. */ | |
582511be PA |
3215 | if (!non_stop) |
3216 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
3217 | |
3218 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3219 | from among those that have had events. Giving equal priority | |
3220 | to all LWPs that have had events helps prevent | |
3221 | starvation. */ | |
3222 | if (ptid_equal (ptid, minus_one_ptid)) | |
3223 | { | |
3224 | event_child->status_pending_p = 1; | |
3225 | event_child->status_pending = w; | |
3226 | ||
3227 | select_event_lwp (&event_child); | |
3228 | ||
0bfdf32f GB |
3229 | /* current_thread and event_child must stay in sync. */ |
3230 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 3231 | |
6bf5e0ba PA |
3232 | event_child->status_pending_p = 0; |
3233 | w = event_child->status_pending; | |
3234 | } | |
3235 | ||
c03e6ccc | 3236 | if (step_over_finished) |
582511be PA |
3237 | { |
3238 | if (!non_stop) | |
3239 | { | |
3240 | /* If we were doing a step-over, all other threads but | |
3241 | the stepping one had been paused in start_step_over, | |
3242 | with their suspend counts incremented. We don't want | |
3243 | to do a full unstop/unpause, because we're in | |
3244 | all-stop mode (so we want threads stopped), but we | |
3245 | still need to unsuspend the other threads, to | |
3246 | decrement their `suspended' count back. */ | |
3247 | unsuspend_all_lwps (event_child); | |
3248 | } | |
3249 | else | |
3250 | { | |
3251 | /* If we just finished a step-over, then all threads had | |
3252 | been momentarily paused. In all-stop, that's fine, | |
3253 | we want threads stopped by now anyway. In non-stop, | |
3254 | we need to re-resume threads that GDB wanted to be | |
3255 | running. */ | |
3256 | unstop_all_lwps (1, event_child); | |
3257 | } | |
3258 | } | |
c03e6ccc | 3259 | |
fa593d66 | 3260 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3261 | if (!non_stop) |
3262 | stabilize_threads (); | |
6bf5e0ba PA |
3263 | } |
3264 | else | |
3265 | { | |
3266 | /* If we just finished a step-over, then all threads had been | |
3267 | momentarily paused. In all-stop, that's fine, we want | |
3268 | threads stopped by now anyway. In non-stop, we need to | |
3269 | re-resume threads that GDB wanted to be running. */ | |
3270 | if (step_over_finished) | |
7984d532 | 3271 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3272 | } |
3273 | ||
de0d863e DB |
3274 | if (extended_event_reported (&event_child->waitstatus)) |
3275 | { | |
3276 | /* If the reported event is a fork, vfork or exec, let GDB know. */ | |
3277 | ourstatus->kind = event_child->waitstatus.kind; | |
3278 | ourstatus->value = event_child->waitstatus.value; | |
3279 | ||
3280 | /* Clear the event lwp's waitstatus since we handled it already. */ | |
3281 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3282 | } | |
3283 | else | |
3284 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3285 | |
582511be | 3286 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3287 | it was a software breakpoint, and the client doesn't know we can |
3288 | adjust the breakpoint ourselves. */ | |
3289 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3290 | && !swbreak_feature) | |
582511be PA |
3291 | { |
3292 | int decr_pc = the_low_target.decr_pc_after_break; | |
3293 | ||
3294 | if (decr_pc != 0) | |
3295 | { | |
3296 | struct regcache *regcache | |
3297 | = get_thread_regcache (current_thread, 1); | |
3298 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3299 | } | |
3300 | } | |
3301 | ||
0bfdf32f | 3302 | if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3303 | && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
3304 | { |
3305 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3306 | and it stopped cleanly, so report as SIG0. The use of | |
3307 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3308 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3309 | } |
0bfdf32f | 3310 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3311 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3312 | { |
3313 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3314 | but, it stopped for other reasons. */ |
2ea28649 | 3315 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3316 | } |
de0d863e | 3317 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3318 | { |
2ea28649 | 3319 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3320 | } |
3321 | ||
d50171e4 PA |
3322 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3323 | ||
bd99dc85 | 3324 | if (debug_threads) |
87ce2a04 DE |
3325 | { |
3326 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3327 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3328 | ourstatus->kind, ourstatus->value.sig); |
3329 | debug_exit (); | |
3330 | } | |
bd99dc85 | 3331 | |
0bfdf32f | 3332 | return ptid_of (current_thread); |
bd99dc85 PA |
3333 | } |
3334 | ||
3335 | /* Get rid of any pending event in the pipe. */ | |
3336 | static void | |
3337 | async_file_flush (void) | |
3338 | { | |
3339 | int ret; | |
3340 | char buf; | |
3341 | ||
3342 | do | |
3343 | ret = read (linux_event_pipe[0], &buf, 1); | |
3344 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3345 | } | |
3346 | ||
3347 | /* Put something in the pipe, so the event loop wakes up. */ | |
3348 | static void | |
3349 | async_file_mark (void) | |
3350 | { | |
3351 | int ret; | |
3352 | ||
3353 | async_file_flush (); | |
3354 | ||
3355 | do | |
3356 | ret = write (linux_event_pipe[1], "+", 1); | |
3357 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3358 | ||
3359 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3360 | be awakened anyway. */ | |
3361 | } | |
3362 | ||
95954743 PA |
3363 | static ptid_t |
3364 | linux_wait (ptid_t ptid, | |
3365 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3366 | { |
95954743 | 3367 | ptid_t event_ptid; |
bd99dc85 | 3368 | |
bd99dc85 PA |
3369 | /* Flush the async file first. */ |
3370 | if (target_is_async_p ()) | |
3371 | async_file_flush (); | |
3372 | ||
582511be PA |
3373 | do |
3374 | { | |
3375 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3376 | } | |
3377 | while ((target_options & TARGET_WNOHANG) == 0 | |
3378 | && ptid_equal (event_ptid, null_ptid) | |
3379 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3380 | |
3381 | /* If at least one stop was reported, there may be more. A single | |
3382 | SIGCHLD can signal more than one child stop. */ | |
3383 | if (target_is_async_p () | |
3384 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3385 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3386 | async_file_mark (); |
3387 | ||
3388 | return event_ptid; | |
da6d8c04 DJ |
3389 | } |
3390 | ||
c5f62d5f | 3391 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3392 | |
3393 | static int | |
a1928bad | 3394 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3395 | { |
c5f62d5f DE |
3396 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3397 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3398 | |
c5f62d5f DE |
3399 | #ifdef __NR_tkill |
3400 | { | |
3401 | static int tkill_failed; | |
fd500816 | 3402 | |
c5f62d5f DE |
3403 | if (!tkill_failed) |
3404 | { | |
3405 | int ret; | |
3406 | ||
3407 | errno = 0; | |
3408 | ret = syscall (__NR_tkill, lwpid, signo); | |
3409 | if (errno != ENOSYS) | |
3410 | return ret; | |
3411 | tkill_failed = 1; | |
3412 | } | |
3413 | } | |
fd500816 DJ |
3414 | #endif |
3415 | ||
3416 | return kill (lwpid, signo); | |
3417 | } | |
3418 | ||
964e4306 PA |
3419 | void |
3420 | linux_stop_lwp (struct lwp_info *lwp) | |
3421 | { | |
3422 | send_sigstop (lwp); | |
3423 | } | |
3424 | ||
0d62e5e8 | 3425 | static void |
02fc4de7 | 3426 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3427 | { |
bd99dc85 | 3428 | int pid; |
0d62e5e8 | 3429 | |
d86d4aaf | 3430 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3431 | |
0d62e5e8 DJ |
3432 | /* If we already have a pending stop signal for this process, don't |
3433 | send another. */ | |
54a0b537 | 3434 | if (lwp->stop_expected) |
0d62e5e8 | 3435 | { |
ae13219e | 3436 | if (debug_threads) |
87ce2a04 | 3437 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3438 | |
0d62e5e8 DJ |
3439 | return; |
3440 | } | |
3441 | ||
3442 | if (debug_threads) | |
87ce2a04 | 3443 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3444 | |
d50171e4 | 3445 | lwp->stop_expected = 1; |
bd99dc85 | 3446 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3447 | } |
3448 | ||
7984d532 PA |
3449 | static int |
3450 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3451 | { |
d86d4aaf DE |
3452 | struct thread_info *thread = (struct thread_info *) entry; |
3453 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3454 | |
7984d532 PA |
3455 | /* Ignore EXCEPT. */ |
3456 | if (lwp == except) | |
3457 | return 0; | |
3458 | ||
02fc4de7 | 3459 | if (lwp->stopped) |
7984d532 | 3460 | return 0; |
02fc4de7 PA |
3461 | |
3462 | send_sigstop (lwp); | |
7984d532 PA |
3463 | return 0; |
3464 | } | |
3465 | ||
3466 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3467 | yet. */ | |
3468 | static int | |
3469 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3470 | void *except) | |
3471 | { | |
d86d4aaf DE |
3472 | struct thread_info *thread = (struct thread_info *) entry; |
3473 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3474 | |
3475 | /* Ignore EXCEPT. */ | |
3476 | if (lwp == except) | |
3477 | return 0; | |
3478 | ||
3479 | lwp->suspended++; | |
3480 | ||
3481 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3482 | } |
3483 | ||
95954743 PA |
3484 | static void |
3485 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3486 | { | |
3487 | /* It's dead, really. */ | |
3488 | lwp->dead = 1; | |
3489 | ||
3490 | /* Store the exit status for later. */ | |
3491 | lwp->status_pending_p = 1; | |
3492 | lwp->status_pending = wstat; | |
3493 | ||
95954743 PA |
3494 | /* Prevent trying to stop it. */ |
3495 | lwp->stopped = 1; | |
3496 | ||
3497 | /* No further stops are expected from a dead lwp. */ | |
3498 | lwp->stop_expected = 0; | |
3499 | } | |
3500 | ||
fa96cb38 PA |
3501 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3502 | ||
0d62e5e8 | 3503 | static void |
fa96cb38 | 3504 | wait_for_sigstop (void) |
0d62e5e8 | 3505 | { |
0bfdf32f | 3506 | struct thread_info *saved_thread; |
95954743 | 3507 | ptid_t saved_tid; |
fa96cb38 PA |
3508 | int wstat; |
3509 | int ret; | |
0d62e5e8 | 3510 | |
0bfdf32f GB |
3511 | saved_thread = current_thread; |
3512 | if (saved_thread != NULL) | |
3513 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3514 | else |
95954743 | 3515 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3516 | |
d50171e4 | 3517 | if (debug_threads) |
fa96cb38 | 3518 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3519 | |
fa96cb38 PA |
3520 | /* Passing NULL_PTID as filter indicates we want all events to be |
3521 | left pending. Eventually this returns when there are no | |
3522 | unwaited-for children left. */ | |
3523 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3524 | &wstat, __WALL); | |
3525 | gdb_assert (ret == -1); | |
0d62e5e8 | 3526 | |
0bfdf32f GB |
3527 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3528 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3529 | else |
3530 | { | |
3531 | if (debug_threads) | |
87ce2a04 | 3532 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3533 | |
bd99dc85 PA |
3534 | if (non_stop) |
3535 | { | |
3536 | /* We can't change the current inferior behind GDB's back, | |
3537 | otherwise, a subsequent command may apply to the wrong | |
3538 | process. */ | |
0bfdf32f | 3539 | current_thread = NULL; |
bd99dc85 PA |
3540 | } |
3541 | else | |
3542 | { | |
3543 | /* Set a valid thread as current. */ | |
0bfdf32f | 3544 | set_desired_thread (0); |
bd99dc85 | 3545 | } |
0d62e5e8 DJ |
3546 | } |
3547 | } | |
3548 | ||
fa593d66 PA |
3549 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3550 | move it out, because we need to report the stop event to GDB. For | |
3551 | example, if the user puts a breakpoint in the jump pad, it's | |
3552 | because she wants to debug it. */ | |
3553 | ||
3554 | static int | |
3555 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3556 | { | |
d86d4aaf DE |
3557 | struct thread_info *thread = (struct thread_info *) entry; |
3558 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3559 | |
3560 | gdb_assert (lwp->suspended == 0); | |
3561 | gdb_assert (lwp->stopped); | |
3562 | ||
3563 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3564 | return (supports_fast_tracepoints () | |
58b4daa5 | 3565 | && agent_loaded_p () |
fa593d66 | 3566 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3567 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3568 | || thread->last_resume_kind == resume_step) |
3569 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3570 | } | |
3571 | ||
3572 | static void | |
3573 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3574 | { | |
d86d4aaf DE |
3575 | struct thread_info *thread = (struct thread_info *) entry; |
3576 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3577 | int *wstat; |
3578 | ||
3579 | gdb_assert (lwp->suspended == 0); | |
3580 | gdb_assert (lwp->stopped); | |
3581 | ||
3582 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3583 | ||
3584 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3585 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3586 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3587 | && thread->last_resume_kind != resume_step |
3588 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3589 | { | |
3590 | if (debug_threads) | |
87ce2a04 | 3591 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3592 | lwpid_of (thread)); |
fa593d66 PA |
3593 | |
3594 | if (wstat) | |
3595 | { | |
3596 | lwp->status_pending_p = 0; | |
3597 | enqueue_one_deferred_signal (lwp, wstat); | |
3598 | ||
3599 | if (debug_threads) | |
87ce2a04 DE |
3600 | debug_printf ("Signal %d for LWP %ld deferred " |
3601 | "(in jump pad)\n", | |
d86d4aaf | 3602 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3603 | } |
3604 | ||
3605 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3606 | } | |
3607 | else | |
3608 | lwp->suspended++; | |
3609 | } | |
3610 | ||
3611 | static int | |
3612 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3613 | { | |
d86d4aaf DE |
3614 | struct thread_info *thread = (struct thread_info *) entry; |
3615 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3616 | |
3617 | if (lwp->dead) | |
3618 | return 0; | |
3619 | if (lwp->stopped) | |
3620 | return 0; | |
3621 | return 1; | |
3622 | } | |
3623 | ||
7984d532 PA |
3624 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3625 | If SUSPEND, then also increase the suspend count of every LWP, | |
3626 | except EXCEPT. */ | |
3627 | ||
0d62e5e8 | 3628 | static void |
7984d532 | 3629 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3630 | { |
bde24c0a PA |
3631 | /* Should not be called recursively. */ |
3632 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3633 | ||
87ce2a04 DE |
3634 | if (debug_threads) |
3635 | { | |
3636 | debug_enter (); | |
3637 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3638 | suspend ? "stop-and-suspend" : "stop", | |
3639 | except != NULL | |
d86d4aaf | 3640 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3641 | : "none"); |
3642 | } | |
3643 | ||
bde24c0a PA |
3644 | stopping_threads = (suspend |
3645 | ? STOPPING_AND_SUSPENDING_THREADS | |
3646 | : STOPPING_THREADS); | |
7984d532 PA |
3647 | |
3648 | if (suspend) | |
d86d4aaf | 3649 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3650 | else |
d86d4aaf | 3651 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3652 | wait_for_sigstop (); |
bde24c0a | 3653 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3654 | |
3655 | if (debug_threads) | |
3656 | { | |
3657 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3658 | "back to !stopping\n"); | |
3659 | debug_exit (); | |
3660 | } | |
0d62e5e8 DJ |
3661 | } |
3662 | ||
23f238d3 PA |
3663 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
3664 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 3665 | |
ce3a066d | 3666 | static void |
23f238d3 PA |
3667 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
3668 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 3669 | { |
d86d4aaf | 3670 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3671 | struct thread_info *saved_thread; |
fa593d66 | 3672 | int fast_tp_collecting; |
c06cbd92 YQ |
3673 | struct process_info *proc = get_thread_process (thread); |
3674 | ||
3675 | /* Note that target description may not be initialised | |
3676 | (proc->tdesc == NULL) at this point because the program hasn't | |
3677 | stopped at the first instruction yet. It means GDBserver skips | |
3678 | the extra traps from the wrapper program (see option --wrapper). | |
3679 | Code in this function that requires register access should be | |
3680 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 3681 | |
54a0b537 | 3682 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3683 | return; |
3684 | ||
fa593d66 PA |
3685 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3686 | ||
3687 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3688 | ||
219f2f23 PA |
3689 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3690 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 3691 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
3692 | { |
3693 | /* Collecting 'while-stepping' actions doesn't make sense | |
3694 | anymore. */ | |
d86d4aaf | 3695 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3696 | } |
3697 | ||
0d62e5e8 DJ |
3698 | /* If we have pending signals or status, and a new signal, enqueue the |
3699 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3700 | breakpoint; it will be picked up again below. */ | |
3701 | if (signal != 0 | |
fa593d66 PA |
3702 | && (lwp->status_pending_p |
3703 | || lwp->pending_signals != NULL | |
3704 | || lwp->bp_reinsert != 0 | |
3705 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3706 | { |
3707 | struct pending_signals *p_sig; | |
bca929d3 | 3708 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3709 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3710 | p_sig->signal = signal; |
32ca6d61 DJ |
3711 | if (info == NULL) |
3712 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3713 | else | |
3714 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3715 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3716 | } |
3717 | ||
d50171e4 PA |
3718 | if (lwp->status_pending_p) |
3719 | { | |
3720 | if (debug_threads) | |
87ce2a04 DE |
3721 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3722 | " has pending status\n", | |
d86d4aaf | 3723 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3724 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3725 | return; |
3726 | } | |
0d62e5e8 | 3727 | |
0bfdf32f GB |
3728 | saved_thread = current_thread; |
3729 | current_thread = thread; | |
0d62e5e8 DJ |
3730 | |
3731 | if (debug_threads) | |
87ce2a04 | 3732 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3733 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3734 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3735 | |
3736 | /* This bit needs some thinking about. If we get a signal that | |
3737 | we must report while a single-step reinsert is still pending, | |
3738 | we often end up resuming the thread. It might be better to | |
3739 | (ew) allow a stack of pending events; then we could be sure that | |
3740 | the reinsert happened right away and not lose any signals. | |
3741 | ||
3742 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3743 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3744 | complete correctness, so it won't solve that problem. It may be |
3745 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3746 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3747 | { |
3748 | if (debug_threads) | |
87ce2a04 DE |
3749 | debug_printf (" pending reinsert at 0x%s\n", |
3750 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3751 | |
85e00e85 | 3752 | if (can_hardware_single_step ()) |
d50171e4 | 3753 | { |
fa593d66 PA |
3754 | if (fast_tp_collecting == 0) |
3755 | { | |
3756 | if (step == 0) | |
3757 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3758 | if (lwp->suspended) | |
3759 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3760 | lwp->suspended); | |
3761 | } | |
d50171e4 PA |
3762 | |
3763 | step = 1; | |
3764 | } | |
0d62e5e8 DJ |
3765 | |
3766 | /* Postpone any pending signal. It was enqueued above. */ | |
3767 | signal = 0; | |
3768 | } | |
3769 | ||
fa593d66 PA |
3770 | if (fast_tp_collecting == 1) |
3771 | { | |
3772 | if (debug_threads) | |
87ce2a04 DE |
3773 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3774 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3775 | lwpid_of (thread)); |
fa593d66 PA |
3776 | |
3777 | /* Postpone any pending signal. It was enqueued above. */ | |
3778 | signal = 0; | |
3779 | } | |
3780 | else if (fast_tp_collecting == 2) | |
3781 | { | |
3782 | if (debug_threads) | |
87ce2a04 DE |
3783 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3784 | " single-stepping\n", | |
d86d4aaf | 3785 | lwpid_of (thread)); |
fa593d66 PA |
3786 | |
3787 | if (can_hardware_single_step ()) | |
3788 | step = 1; | |
3789 | else | |
38e08fca GB |
3790 | { |
3791 | internal_error (__FILE__, __LINE__, | |
3792 | "moving out of jump pad single-stepping" | |
3793 | " not implemented on this target"); | |
3794 | } | |
fa593d66 PA |
3795 | |
3796 | /* Postpone any pending signal. It was enqueued above. */ | |
3797 | signal = 0; | |
3798 | } | |
3799 | ||
219f2f23 PA |
3800 | /* If we have while-stepping actions in this thread set it stepping. |
3801 | If we have a signal to deliver, it may or may not be set to | |
3802 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3803 | while-stepping into a signal handler. A possible smart thing to | |
3804 | do would be to set an internal breakpoint at the signal return | |
3805 | address, continue, and carry on catching this while-stepping | |
3806 | action only when that breakpoint is hit. A future | |
3807 | enhancement. */ | |
d86d4aaf | 3808 | if (thread->while_stepping != NULL |
219f2f23 PA |
3809 | && can_hardware_single_step ()) |
3810 | { | |
3811 | if (debug_threads) | |
87ce2a04 | 3812 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 3813 | lwpid_of (thread)); |
219f2f23 PA |
3814 | step = 1; |
3815 | } | |
3816 | ||
c06cbd92 | 3817 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 3818 | { |
0bfdf32f | 3819 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
3820 | |
3821 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
3822 | ||
3823 | if (debug_threads) | |
3824 | { | |
3825 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
3826 | (long) lwp->stop_pc); | |
3827 | } | |
0d62e5e8 DJ |
3828 | } |
3829 | ||
fa593d66 PA |
3830 | /* If we have pending signals, consume one unless we are trying to |
3831 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3832 | collect. */ | |
3833 | if (lwp->pending_signals != NULL | |
3834 | && lwp->bp_reinsert == 0 | |
3835 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3836 | { |
3837 | struct pending_signals **p_sig; | |
3838 | ||
54a0b537 | 3839 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3840 | while ((*p_sig)->prev != NULL) |
3841 | p_sig = &(*p_sig)->prev; | |
3842 | ||
3843 | signal = (*p_sig)->signal; | |
32ca6d61 | 3844 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 3845 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3846 | &(*p_sig)->info); |
32ca6d61 | 3847 | |
0d62e5e8 DJ |
3848 | free (*p_sig); |
3849 | *p_sig = NULL; | |
3850 | } | |
3851 | ||
aa5ca48f DE |
3852 | if (the_low_target.prepare_to_resume != NULL) |
3853 | the_low_target.prepare_to_resume (lwp); | |
3854 | ||
d86d4aaf | 3855 | regcache_invalidate_thread (thread); |
da6d8c04 | 3856 | errno = 0; |
54a0b537 | 3857 | lwp->stepping = step; |
d86d4aaf | 3858 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 3859 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3860 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3861 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3862 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 3863 | |
0bfdf32f | 3864 | current_thread = saved_thread; |
da6d8c04 | 3865 | if (errno) |
23f238d3 PA |
3866 | perror_with_name ("resuming thread"); |
3867 | ||
3868 | /* Successfully resumed. Clear state that no longer makes sense, | |
3869 | and mark the LWP as running. Must not do this before resuming | |
3870 | otherwise if that fails other code will be confused. E.g., we'd | |
3871 | later try to stop the LWP and hang forever waiting for a stop | |
3872 | status. Note that we must not throw after this is cleared, | |
3873 | otherwise handle_zombie_lwp_error would get confused. */ | |
3874 | lwp->stopped = 0; | |
3875 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3876 | } | |
3877 | ||
3878 | /* Called when we try to resume a stopped LWP and that errors out. If | |
3879 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
3880 | or about to become), discard the error, clear any pending status | |
3881 | the LWP may have, and return true (we'll collect the exit status | |
3882 | soon enough). Otherwise, return false. */ | |
3883 | ||
3884 | static int | |
3885 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
3886 | { | |
3887 | struct thread_info *thread = get_lwp_thread (lp); | |
3888 | ||
3889 | /* If we get an error after resuming the LWP successfully, we'd | |
3890 | confuse !T state for the LWP being gone. */ | |
3891 | gdb_assert (lp->stopped); | |
3892 | ||
3893 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
3894 | because even if ptrace failed with ESRCH, the tracee may be "not | |
3895 | yet fully dead", but already refusing ptrace requests. In that | |
3896 | case the tracee has 'R (Running)' state for a little bit | |
3897 | (observed in Linux 3.18). See also the note on ESRCH in the | |
3898 | ptrace(2) man page. Instead, check whether the LWP has any state | |
3899 | other than ptrace-stopped. */ | |
3900 | ||
3901 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
3902 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 3903 | { |
23f238d3 PA |
3904 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
3905 | lp->status_pending_p = 0; | |
3906 | return 1; | |
3907 | } | |
3908 | return 0; | |
3909 | } | |
3910 | ||
3911 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
3912 | disappears while we try to resume it. */ | |
3221518c | 3913 | |
23f238d3 PA |
3914 | static void |
3915 | linux_resume_one_lwp (struct lwp_info *lwp, | |
3916 | int step, int signal, siginfo_t *info) | |
3917 | { | |
3918 | TRY | |
3919 | { | |
3920 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
3921 | } | |
3922 | CATCH (ex, RETURN_MASK_ERROR) | |
3923 | { | |
3924 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
3925 | throw_exception (ex); | |
3221518c | 3926 | } |
23f238d3 | 3927 | END_CATCH |
da6d8c04 DJ |
3928 | } |
3929 | ||
2bd7c093 PA |
3930 | struct thread_resume_array |
3931 | { | |
3932 | struct thread_resume *resume; | |
3933 | size_t n; | |
3934 | }; | |
64386c31 | 3935 | |
ebcf782c DE |
3936 | /* This function is called once per thread via find_inferior. |
3937 | ARG is a pointer to a thread_resume_array struct. | |
3938 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3939 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3940 | |
3941 | This algorithm is O(threads * resume elements), but resume elements | |
3942 | is small (and will remain small at least until GDB supports thread | |
3943 | suspension). */ | |
ebcf782c | 3944 | |
2bd7c093 PA |
3945 | static int |
3946 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3947 | { |
d86d4aaf DE |
3948 | struct thread_info *thread = (struct thread_info *) entry; |
3949 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3950 | int ndx; |
2bd7c093 | 3951 | struct thread_resume_array *r; |
64386c31 | 3952 | |
2bd7c093 | 3953 | r = arg; |
64386c31 | 3954 | |
2bd7c093 | 3955 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3956 | { |
3957 | ptid_t ptid = r->resume[ndx].thread; | |
3958 | if (ptid_equal (ptid, minus_one_ptid) | |
3959 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3960 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3961 | of PID'. */ | |
d86d4aaf | 3962 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
3963 | && (ptid_is_pid (ptid) |
3964 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3965 | { |
d50171e4 | 3966 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3967 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3968 | { |
3969 | if (debug_threads) | |
87ce2a04 DE |
3970 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3971 | (thread->last_status.kind | |
3972 | == TARGET_WAITKIND_STOPPED) | |
3973 | ? "stopped" | |
3974 | : "stopping", | |
d86d4aaf | 3975 | lwpid_of (thread)); |
d50171e4 PA |
3976 | |
3977 | continue; | |
3978 | } | |
3979 | ||
95954743 | 3980 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3981 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3982 | |
c2d6af84 PA |
3983 | lwp->step_range_start = lwp->resume->step_range_start; |
3984 | lwp->step_range_end = lwp->resume->step_range_end; | |
3985 | ||
fa593d66 PA |
3986 | /* If we had a deferred signal to report, dequeue one now. |
3987 | This can happen if LWP gets more than one signal while | |
3988 | trying to get out of a jump pad. */ | |
3989 | if (lwp->stopped | |
3990 | && !lwp->status_pending_p | |
3991 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3992 | { | |
3993 | lwp->status_pending_p = 1; | |
3994 | ||
3995 | if (debug_threads) | |
87ce2a04 DE |
3996 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
3997 | "leaving status pending.\n", | |
d86d4aaf DE |
3998 | WSTOPSIG (lwp->status_pending), |
3999 | lwpid_of (thread)); | |
fa593d66 PA |
4000 | } |
4001 | ||
95954743 PA |
4002 | return 0; |
4003 | } | |
4004 | } | |
2bd7c093 PA |
4005 | |
4006 | /* No resume action for this thread. */ | |
4007 | lwp->resume = NULL; | |
64386c31 | 4008 | |
2bd7c093 | 4009 | return 0; |
5544ad89 DJ |
4010 | } |
4011 | ||
20ad9378 DE |
4012 | /* find_inferior callback for linux_resume. |
4013 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 4014 | |
bd99dc85 PA |
4015 | static int |
4016 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 4017 | { |
d86d4aaf DE |
4018 | struct thread_info *thread = (struct thread_info *) entry; |
4019 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4020 | |
bd99dc85 PA |
4021 | /* LWPs which will not be resumed are not interesting, because |
4022 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4023 | if (lwp->resume == NULL) |
bd99dc85 | 4024 | return 0; |
64386c31 | 4025 | |
582511be | 4026 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
4027 | * (int *) flag_p = 1; |
4028 | ||
4029 | return 0; | |
4030 | } | |
4031 | ||
4032 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4033 | internal breakpoint that we need to step over. It assumes that any | |
4034 | required STOP_PC adjustment has already been propagated to the | |
4035 | inferior's regcache. */ | |
4036 | ||
4037 | static int | |
4038 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
4039 | { | |
d86d4aaf DE |
4040 | struct thread_info *thread = (struct thread_info *) entry; |
4041 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 4042 | struct thread_info *saved_thread; |
d50171e4 | 4043 | CORE_ADDR pc; |
c06cbd92 YQ |
4044 | struct process_info *proc = get_thread_process (thread); |
4045 | ||
4046 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4047 | don't have to do step over. */ | |
4048 | if (proc->tdesc == NULL) | |
4049 | return 0; | |
d50171e4 PA |
4050 | |
4051 | /* LWPs which will not be resumed are not interesting, because we | |
4052 | might not wait for them next time through linux_wait. */ | |
4053 | ||
4054 | if (!lwp->stopped) | |
4055 | { | |
4056 | if (debug_threads) | |
87ce2a04 | 4057 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4058 | lwpid_of (thread)); |
d50171e4 PA |
4059 | return 0; |
4060 | } | |
4061 | ||
8336d594 | 4062 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4063 | { |
4064 | if (debug_threads) | |
87ce2a04 DE |
4065 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4066 | " stopped\n", | |
d86d4aaf | 4067 | lwpid_of (thread)); |
d50171e4 PA |
4068 | return 0; |
4069 | } | |
4070 | ||
7984d532 PA |
4071 | gdb_assert (lwp->suspended >= 0); |
4072 | ||
4073 | if (lwp->suspended) | |
4074 | { | |
4075 | if (debug_threads) | |
87ce2a04 | 4076 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4077 | lwpid_of (thread)); |
7984d532 PA |
4078 | return 0; |
4079 | } | |
4080 | ||
d50171e4 PA |
4081 | if (!lwp->need_step_over) |
4082 | { | |
4083 | if (debug_threads) | |
d86d4aaf | 4084 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 4085 | } |
5544ad89 | 4086 | |
bd99dc85 | 4087 | if (lwp->status_pending_p) |
d50171e4 PA |
4088 | { |
4089 | if (debug_threads) | |
87ce2a04 DE |
4090 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4091 | " status.\n", | |
d86d4aaf | 4092 | lwpid_of (thread)); |
d50171e4 PA |
4093 | return 0; |
4094 | } | |
4095 | ||
4096 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4097 | or we have. */ | |
4098 | pc = get_pc (lwp); | |
4099 | ||
4100 | /* If the PC has changed since we stopped, then don't do anything, | |
4101 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4102 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4103 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4104 | command, or poked thread's registers herself. */ | |
4105 | if (pc != lwp->stop_pc) | |
4106 | { | |
4107 | if (debug_threads) | |
87ce2a04 DE |
4108 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4109 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4110 | lwpid_of (thread), |
4111 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
4112 | |
4113 | lwp->need_step_over = 0; | |
4114 | return 0; | |
4115 | } | |
4116 | ||
0bfdf32f GB |
4117 | saved_thread = current_thread; |
4118 | current_thread = thread; | |
d50171e4 | 4119 | |
8b07ae33 | 4120 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4121 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4122 | { |
8b07ae33 | 4123 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4124 | though. If the condition is being evaluated on the target's side |
4125 | and it evaluate to false, step over this breakpoint as well. */ | |
4126 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4127 | && gdb_condition_true_at_breakpoint (pc) |
4128 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4129 | { |
4130 | if (debug_threads) | |
87ce2a04 DE |
4131 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4132 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4133 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4134 | |
0bfdf32f | 4135 | current_thread = saved_thread; |
8b07ae33 PA |
4136 | return 0; |
4137 | } | |
4138 | else | |
4139 | { | |
4140 | if (debug_threads) | |
87ce2a04 DE |
4141 | debug_printf ("Need step over [LWP %ld]? yes, " |
4142 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4143 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4144 | |
8b07ae33 PA |
4145 | /* We've found an lwp that needs stepping over --- return 1 so |
4146 | that find_inferior stops looking. */ | |
0bfdf32f | 4147 | current_thread = saved_thread; |
8b07ae33 PA |
4148 | |
4149 | /* If the step over is cancelled, this is set again. */ | |
4150 | lwp->need_step_over = 0; | |
4151 | return 1; | |
4152 | } | |
d50171e4 PA |
4153 | } |
4154 | ||
0bfdf32f | 4155 | current_thread = saved_thread; |
d50171e4 PA |
4156 | |
4157 | if (debug_threads) | |
87ce2a04 DE |
4158 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4159 | " at 0x%s\n", | |
d86d4aaf | 4160 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4161 | |
bd99dc85 | 4162 | return 0; |
5544ad89 DJ |
4163 | } |
4164 | ||
d50171e4 PA |
4165 | /* Start a step-over operation on LWP. When LWP stopped at a |
4166 | breakpoint, to make progress, we need to remove the breakpoint out | |
4167 | of the way. If we let other threads run while we do that, they may | |
4168 | pass by the breakpoint location and miss hitting it. To avoid | |
4169 | that, a step-over momentarily stops all threads while LWP is | |
4170 | single-stepped while the breakpoint is temporarily uninserted from | |
4171 | the inferior. When the single-step finishes, we reinsert the | |
4172 | breakpoint, and let all threads that are supposed to be running, | |
4173 | run again. | |
4174 | ||
4175 | On targets that don't support hardware single-step, we don't | |
4176 | currently support full software single-stepping. Instead, we only | |
4177 | support stepping over the thread event breakpoint, by asking the | |
4178 | low target where to place a reinsert breakpoint. Since this | |
4179 | routine assumes the breakpoint being stepped over is a thread event | |
4180 | breakpoint, it usually assumes the return address of the current | |
4181 | function is a good enough place to set the reinsert breakpoint. */ | |
4182 | ||
4183 | static int | |
4184 | start_step_over (struct lwp_info *lwp) | |
4185 | { | |
d86d4aaf | 4186 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4187 | struct thread_info *saved_thread; |
d50171e4 PA |
4188 | CORE_ADDR pc; |
4189 | int step; | |
4190 | ||
4191 | if (debug_threads) | |
87ce2a04 | 4192 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4193 | lwpid_of (thread)); |
d50171e4 | 4194 | |
7984d532 PA |
4195 | stop_all_lwps (1, lwp); |
4196 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
4197 | |
4198 | if (debug_threads) | |
87ce2a04 | 4199 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4200 | |
4201 | /* Note, we should always reach here with an already adjusted PC, | |
4202 | either by GDB (if we're resuming due to GDB's request), or by our | |
4203 | caller, if we just finished handling an internal breakpoint GDB | |
4204 | shouldn't care about. */ | |
4205 | pc = get_pc (lwp); | |
4206 | ||
0bfdf32f GB |
4207 | saved_thread = current_thread; |
4208 | current_thread = thread; | |
d50171e4 PA |
4209 | |
4210 | lwp->bp_reinsert = pc; | |
4211 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4212 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
4213 | |
4214 | if (can_hardware_single_step ()) | |
4215 | { | |
4216 | step = 1; | |
4217 | } | |
4218 | else | |
4219 | { | |
4220 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
4221 | set_reinsert_breakpoint (raddr); | |
4222 | step = 0; | |
4223 | } | |
4224 | ||
0bfdf32f | 4225 | current_thread = saved_thread; |
d50171e4 PA |
4226 | |
4227 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4228 | ||
4229 | /* Require next event from this LWP. */ | |
d86d4aaf | 4230 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
4231 | return 1; |
4232 | } | |
4233 | ||
4234 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
4235 | start_step_over, if still there, and delete any reinsert | |
4236 | breakpoints we've set, on non hardware single-step targets. */ | |
4237 | ||
4238 | static int | |
4239 | finish_step_over (struct lwp_info *lwp) | |
4240 | { | |
4241 | if (lwp->bp_reinsert != 0) | |
4242 | { | |
4243 | if (debug_threads) | |
87ce2a04 | 4244 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
4245 | |
4246 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
4247 | may be no breakpoint to reinsert there by now. */ | |
4248 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4249 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4250 | |
4251 | lwp->bp_reinsert = 0; | |
4252 | ||
4253 | /* Delete any software-single-step reinsert breakpoints. No | |
4254 | longer needed. We don't have to worry about other threads | |
4255 | hitting this trap, and later not being able to explain it, | |
4256 | because we were stepping over a breakpoint, and we hold all | |
4257 | threads but LWP stopped while doing that. */ | |
4258 | if (!can_hardware_single_step ()) | |
4259 | delete_reinsert_breakpoints (); | |
4260 | ||
4261 | step_over_bkpt = null_ptid; | |
4262 | return 1; | |
4263 | } | |
4264 | else | |
4265 | return 0; | |
4266 | } | |
4267 | ||
5544ad89 DJ |
4268 | /* This function is called once per thread. We check the thread's resume |
4269 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 4270 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 4271 | |
bd99dc85 PA |
4272 | For threads which we aren't explicitly told otherwise, we preserve |
4273 | the stepping flag; this is used for stepping over gdbserver-placed | |
4274 | breakpoints. | |
4275 | ||
4276 | If pending_flags was set in any thread, we queue any needed | |
4277 | signals, since we won't actually resume. We already have a pending | |
4278 | event to report, so we don't need to preserve any step requests; | |
4279 | they should be re-issued if necessary. */ | |
4280 | ||
4281 | static int | |
4282 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 4283 | { |
d86d4aaf DE |
4284 | struct thread_info *thread = (struct thread_info *) entry; |
4285 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 4286 | int step; |
d50171e4 PA |
4287 | int leave_all_stopped = * (int *) arg; |
4288 | int leave_pending; | |
5544ad89 | 4289 | |
2bd7c093 | 4290 | if (lwp->resume == NULL) |
bd99dc85 | 4291 | return 0; |
5544ad89 | 4292 | |
bd99dc85 | 4293 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4294 | { |
bd99dc85 | 4295 | if (debug_threads) |
d86d4aaf | 4296 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4297 | |
4298 | if (!lwp->stopped) | |
4299 | { | |
4300 | if (debug_threads) | |
d86d4aaf | 4301 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4302 | |
d50171e4 PA |
4303 | /* Stop the thread, and wait for the event asynchronously, |
4304 | through the event loop. */ | |
02fc4de7 | 4305 | send_sigstop (lwp); |
bd99dc85 PA |
4306 | } |
4307 | else | |
4308 | { | |
4309 | if (debug_threads) | |
87ce2a04 | 4310 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4311 | lwpid_of (thread)); |
d50171e4 PA |
4312 | |
4313 | /* The LWP may have been stopped in an internal event that | |
4314 | was not meant to be notified back to GDB (e.g., gdbserver | |
4315 | breakpoint), so we should be reporting a stop event in | |
4316 | this case too. */ | |
4317 | ||
4318 | /* If the thread already has a pending SIGSTOP, this is a | |
4319 | no-op. Otherwise, something later will presumably resume | |
4320 | the thread and this will cause it to cancel any pending | |
4321 | operation, due to last_resume_kind == resume_stop. If | |
4322 | the thread already has a pending status to report, we | |
4323 | will still report it the next time we wait - see | |
4324 | status_pending_p_callback. */ | |
1a981360 PA |
4325 | |
4326 | /* If we already have a pending signal to report, then | |
4327 | there's no need to queue a SIGSTOP, as this means we're | |
4328 | midway through moving the LWP out of the jumppad, and we | |
4329 | will report the pending signal as soon as that is | |
4330 | finished. */ | |
4331 | if (lwp->pending_signals_to_report == NULL) | |
4332 | send_sigstop (lwp); | |
bd99dc85 | 4333 | } |
32ca6d61 | 4334 | |
bd99dc85 PA |
4335 | /* For stop requests, we're done. */ |
4336 | lwp->resume = NULL; | |
fc7238bb | 4337 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4338 | return 0; |
5544ad89 DJ |
4339 | } |
4340 | ||
bd99dc85 PA |
4341 | /* If this thread which is about to be resumed has a pending status, |
4342 | then don't resume any threads - we can just report the pending | |
4343 | status. Make sure to queue any signals that would otherwise be | |
4344 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
4345 | thread has a pending status. If there's a thread that needs the |
4346 | step-over-breakpoint dance, then don't resume any other thread | |
4347 | but that particular one. */ | |
4348 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 4349 | |
d50171e4 | 4350 | if (!leave_pending) |
bd99dc85 PA |
4351 | { |
4352 | if (debug_threads) | |
d86d4aaf | 4353 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4354 | |
d50171e4 | 4355 | step = (lwp->resume->kind == resume_step); |
2acc282a | 4356 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
4357 | } |
4358 | else | |
4359 | { | |
4360 | if (debug_threads) | |
d86d4aaf | 4361 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 4362 | |
bd99dc85 PA |
4363 | /* If we have a new signal, enqueue the signal. */ |
4364 | if (lwp->resume->sig != 0) | |
4365 | { | |
4366 | struct pending_signals *p_sig; | |
4367 | p_sig = xmalloc (sizeof (*p_sig)); | |
4368 | p_sig->prev = lwp->pending_signals; | |
4369 | p_sig->signal = lwp->resume->sig; | |
4370 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4371 | ||
4372 | /* If this is the same signal we were previously stopped by, | |
4373 | make sure to queue its siginfo. We can ignore the return | |
4374 | value of ptrace; if it fails, we'll skip | |
4375 | PTRACE_SETSIGINFO. */ | |
4376 | if (WIFSTOPPED (lwp->last_status) | |
4377 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 4378 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4379 | &p_sig->info); |
bd99dc85 PA |
4380 | |
4381 | lwp->pending_signals = p_sig; | |
4382 | } | |
4383 | } | |
5544ad89 | 4384 | |
fc7238bb | 4385 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4386 | lwp->resume = NULL; |
5544ad89 | 4387 | return 0; |
0d62e5e8 DJ |
4388 | } |
4389 | ||
4390 | static void | |
2bd7c093 | 4391 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 4392 | { |
2bd7c093 | 4393 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 4394 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
4395 | int any_pending; |
4396 | int leave_all_stopped; | |
c6ecbae5 | 4397 | |
87ce2a04 DE |
4398 | if (debug_threads) |
4399 | { | |
4400 | debug_enter (); | |
4401 | debug_printf ("linux_resume:\n"); | |
4402 | } | |
4403 | ||
2bd7c093 | 4404 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 4405 | |
d50171e4 PA |
4406 | /* If there is a thread which would otherwise be resumed, which has |
4407 | a pending status, then don't resume any threads - we can just | |
4408 | report the pending status. Make sure to queue any signals that | |
4409 | would otherwise be sent. In non-stop mode, we'll apply this | |
4410 | logic to each thread individually. We consume all pending events | |
4411 | before considering to start a step-over (in all-stop). */ | |
4412 | any_pending = 0; | |
bd99dc85 | 4413 | if (!non_stop) |
d86d4aaf | 4414 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
4415 | |
4416 | /* If there is a thread which would otherwise be resumed, which is | |
4417 | stopped at a breakpoint that needs stepping over, then don't | |
4418 | resume any threads - have it step over the breakpoint with all | |
4419 | other threads stopped, then resume all threads again. Make sure | |
4420 | to queue any signals that would otherwise be delivered or | |
4421 | queued. */ | |
4422 | if (!any_pending && supports_breakpoints ()) | |
4423 | need_step_over | |
d86d4aaf DE |
4424 | = (struct thread_info *) find_inferior (&all_threads, |
4425 | need_step_over_p, NULL); | |
d50171e4 PA |
4426 | |
4427 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4428 | ||
4429 | if (debug_threads) | |
4430 | { | |
4431 | if (need_step_over != NULL) | |
87ce2a04 | 4432 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4433 | else if (any_pending) |
87ce2a04 DE |
4434 | debug_printf ("Not resuming, all-stop and found " |
4435 | "an LWP with pending status\n"); | |
d50171e4 | 4436 | else |
87ce2a04 | 4437 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4438 | } |
4439 | ||
4440 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4441 | otherwise deliver. */ | |
4442 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4443 | ||
4444 | if (need_step_over) | |
d86d4aaf | 4445 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4446 | |
4447 | if (debug_threads) | |
4448 | { | |
4449 | debug_printf ("linux_resume done\n"); | |
4450 | debug_exit (); | |
4451 | } | |
d50171e4 PA |
4452 | } |
4453 | ||
4454 | /* This function is called once per thread. We check the thread's | |
4455 | last resume request, which will tell us whether to resume, step, or | |
4456 | leave the thread stopped. Any signal the client requested to be | |
4457 | delivered has already been enqueued at this point. | |
4458 | ||
4459 | If any thread that GDB wants running is stopped at an internal | |
4460 | breakpoint that needs stepping over, we start a step-over operation | |
4461 | on that particular thread, and leave all others stopped. */ | |
4462 | ||
7984d532 PA |
4463 | static int |
4464 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4465 | { |
d86d4aaf DE |
4466 | struct thread_info *thread = (struct thread_info *) entry; |
4467 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4468 | int step; |
4469 | ||
7984d532 PA |
4470 | if (lwp == except) |
4471 | return 0; | |
d50171e4 PA |
4472 | |
4473 | if (debug_threads) | |
d86d4aaf | 4474 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4475 | |
4476 | if (!lwp->stopped) | |
4477 | { | |
4478 | if (debug_threads) | |
d86d4aaf | 4479 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4480 | return 0; |
d50171e4 PA |
4481 | } |
4482 | ||
02fc4de7 PA |
4483 | if (thread->last_resume_kind == resume_stop |
4484 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4485 | { |
4486 | if (debug_threads) | |
87ce2a04 | 4487 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4488 | lwpid_of (thread)); |
7984d532 | 4489 | return 0; |
d50171e4 PA |
4490 | } |
4491 | ||
4492 | if (lwp->status_pending_p) | |
4493 | { | |
4494 | if (debug_threads) | |
87ce2a04 | 4495 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4496 | lwpid_of (thread)); |
7984d532 | 4497 | return 0; |
d50171e4 PA |
4498 | } |
4499 | ||
7984d532 PA |
4500 | gdb_assert (lwp->suspended >= 0); |
4501 | ||
d50171e4 PA |
4502 | if (lwp->suspended) |
4503 | { | |
4504 | if (debug_threads) | |
d86d4aaf | 4505 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4506 | return 0; |
d50171e4 PA |
4507 | } |
4508 | ||
1a981360 PA |
4509 | if (thread->last_resume_kind == resume_stop |
4510 | && lwp->pending_signals_to_report == NULL | |
4511 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4512 | { |
4513 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4514 | last_status.kind check above would catch it, and we wouldn't | |
4515 | reach here. This LWP may have been momentarily paused by a | |
4516 | stop_all_lwps call while handling for example, another LWP's | |
4517 | step-over. In that case, the pending expected SIGSTOP signal | |
4518 | that was queued at vCont;t handling time will have already | |
4519 | been consumed by wait_for_sigstop, and so we need to requeue | |
4520 | another one here. Note that if the LWP already has a SIGSTOP | |
4521 | pending, this is a no-op. */ | |
4522 | ||
4523 | if (debug_threads) | |
87ce2a04 DE |
4524 | debug_printf ("Client wants LWP %ld to stop. " |
4525 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4526 | lwpid_of (thread)); |
02fc4de7 PA |
4527 | |
4528 | send_sigstop (lwp); | |
4529 | } | |
4530 | ||
8336d594 | 4531 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 4532 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4533 | return 0; |
4534 | } | |
4535 | ||
4536 | static int | |
4537 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4538 | { | |
d86d4aaf DE |
4539 | struct thread_info *thread = (struct thread_info *) entry; |
4540 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4541 | |
4542 | if (lwp == except) | |
4543 | return 0; | |
4544 | ||
4545 | lwp->suspended--; | |
4546 | gdb_assert (lwp->suspended >= 0); | |
4547 | ||
4548 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4549 | } |
4550 | ||
4551 | /* When we finish a step-over, set threads running again. If there's | |
4552 | another thread that may need a step-over, now's the time to start | |
4553 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4554 | ||
4555 | static void | |
4556 | proceed_all_lwps (void) | |
4557 | { | |
d86d4aaf | 4558 | struct thread_info *need_step_over; |
d50171e4 PA |
4559 | |
4560 | /* If there is a thread which would otherwise be resumed, which is | |
4561 | stopped at a breakpoint that needs stepping over, then don't | |
4562 | resume any threads - have it step over the breakpoint with all | |
4563 | other threads stopped, then resume all threads again. */ | |
4564 | ||
4565 | if (supports_breakpoints ()) | |
4566 | { | |
4567 | need_step_over | |
d86d4aaf DE |
4568 | = (struct thread_info *) find_inferior (&all_threads, |
4569 | need_step_over_p, NULL); | |
d50171e4 PA |
4570 | |
4571 | if (need_step_over != NULL) | |
4572 | { | |
4573 | if (debug_threads) | |
87ce2a04 DE |
4574 | debug_printf ("proceed_all_lwps: found " |
4575 | "thread %ld needing a step-over\n", | |
4576 | lwpid_of (need_step_over)); | |
d50171e4 | 4577 | |
d86d4aaf | 4578 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4579 | return; |
4580 | } | |
4581 | } | |
5544ad89 | 4582 | |
d50171e4 | 4583 | if (debug_threads) |
87ce2a04 | 4584 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4585 | |
d86d4aaf | 4586 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4587 | } |
4588 | ||
4589 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4590 | pending statuses, are set to run again, except for EXCEPT, if not | |
4591 | NULL. This undoes a stop_all_lwps call. */ | |
4592 | ||
4593 | static void | |
7984d532 | 4594 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4595 | { |
5544ad89 DJ |
4596 | if (debug_threads) |
4597 | { | |
87ce2a04 | 4598 | debug_enter (); |
d50171e4 | 4599 | if (except) |
87ce2a04 | 4600 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4601 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4602 | else |
87ce2a04 | 4603 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4604 | } |
4605 | ||
7984d532 | 4606 | if (unsuspend) |
d86d4aaf | 4607 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4608 | else |
d86d4aaf | 4609 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4610 | |
4611 | if (debug_threads) | |
4612 | { | |
4613 | debug_printf ("unstop_all_lwps done\n"); | |
4614 | debug_exit (); | |
4615 | } | |
0d62e5e8 DJ |
4616 | } |
4617 | ||
58caa3dc DJ |
4618 | |
4619 | #ifdef HAVE_LINUX_REGSETS | |
4620 | ||
1faeff08 MR |
4621 | #define use_linux_regsets 1 |
4622 | ||
030031ee PA |
4623 | /* Returns true if REGSET has been disabled. */ |
4624 | ||
4625 | static int | |
4626 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4627 | { | |
4628 | return (info->disabled_regsets != NULL | |
4629 | && info->disabled_regsets[regset - info->regsets]); | |
4630 | } | |
4631 | ||
4632 | /* Disable REGSET. */ | |
4633 | ||
4634 | static void | |
4635 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4636 | { | |
4637 | int dr_offset; | |
4638 | ||
4639 | dr_offset = regset - info->regsets; | |
4640 | if (info->disabled_regsets == NULL) | |
4641 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4642 | info->disabled_regsets[dr_offset] = 1; | |
4643 | } | |
4644 | ||
58caa3dc | 4645 | static int |
3aee8918 PA |
4646 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4647 | struct regcache *regcache) | |
58caa3dc DJ |
4648 | { |
4649 | struct regset_info *regset; | |
e9d25b98 | 4650 | int saw_general_regs = 0; |
95954743 | 4651 | int pid; |
1570b33e | 4652 | struct iovec iov; |
58caa3dc | 4653 | |
0bfdf32f | 4654 | pid = lwpid_of (current_thread); |
28eef672 | 4655 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4656 | { |
1570b33e L |
4657 | void *buf, *data; |
4658 | int nt_type, res; | |
58caa3dc | 4659 | |
030031ee | 4660 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4661 | continue; |
58caa3dc | 4662 | |
bca929d3 | 4663 | buf = xmalloc (regset->size); |
1570b33e L |
4664 | |
4665 | nt_type = regset->nt_type; | |
4666 | if (nt_type) | |
4667 | { | |
4668 | iov.iov_base = buf; | |
4669 | iov.iov_len = regset->size; | |
4670 | data = (void *) &iov; | |
4671 | } | |
4672 | else | |
4673 | data = buf; | |
4674 | ||
dfb64f85 | 4675 | #ifndef __sparc__ |
f15f9948 | 4676 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4677 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4678 | #else |
1570b33e | 4679 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4680 | #endif |
58caa3dc DJ |
4681 | if (res < 0) |
4682 | { | |
4683 | if (errno == EIO) | |
4684 | { | |
52fa2412 | 4685 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4686 | this process mode. */ |
030031ee | 4687 | disable_regset (regsets_info, regset); |
58caa3dc | 4688 | } |
e5a9158d AA |
4689 | else if (errno == ENODATA) |
4690 | { | |
4691 | /* ENODATA may be returned if the regset is currently | |
4692 | not "active". This can happen in normal operation, | |
4693 | so suppress the warning in this case. */ | |
4694 | } | |
58caa3dc DJ |
4695 | else |
4696 | { | |
0d62e5e8 | 4697 | char s[256]; |
95954743 PA |
4698 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4699 | pid); | |
0d62e5e8 | 4700 | perror (s); |
58caa3dc DJ |
4701 | } |
4702 | } | |
098dbe61 AA |
4703 | else |
4704 | { | |
4705 | if (regset->type == GENERAL_REGS) | |
4706 | saw_general_regs = 1; | |
4707 | regset->store_function (regcache, buf); | |
4708 | } | |
fdeb2a12 | 4709 | free (buf); |
58caa3dc | 4710 | } |
e9d25b98 DJ |
4711 | if (saw_general_regs) |
4712 | return 0; | |
4713 | else | |
4714 | return 1; | |
58caa3dc DJ |
4715 | } |
4716 | ||
4717 | static int | |
3aee8918 PA |
4718 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4719 | struct regcache *regcache) | |
58caa3dc DJ |
4720 | { |
4721 | struct regset_info *regset; | |
e9d25b98 | 4722 | int saw_general_regs = 0; |
95954743 | 4723 | int pid; |
1570b33e | 4724 | struct iovec iov; |
58caa3dc | 4725 | |
0bfdf32f | 4726 | pid = lwpid_of (current_thread); |
28eef672 | 4727 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4728 | { |
1570b33e L |
4729 | void *buf, *data; |
4730 | int nt_type, res; | |
58caa3dc | 4731 | |
feea5f36 AA |
4732 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
4733 | || regset->fill_function == NULL) | |
28eef672 | 4734 | continue; |
58caa3dc | 4735 | |
bca929d3 | 4736 | buf = xmalloc (regset->size); |
545587ee DJ |
4737 | |
4738 | /* First fill the buffer with the current register set contents, | |
4739 | in case there are any items in the kernel's regset that are | |
4740 | not in gdbserver's regcache. */ | |
1570b33e L |
4741 | |
4742 | nt_type = regset->nt_type; | |
4743 | if (nt_type) | |
4744 | { | |
4745 | iov.iov_base = buf; | |
4746 | iov.iov_len = regset->size; | |
4747 | data = (void *) &iov; | |
4748 | } | |
4749 | else | |
4750 | data = buf; | |
4751 | ||
dfb64f85 | 4752 | #ifndef __sparc__ |
f15f9948 | 4753 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4754 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4755 | #else |
689cc2ae | 4756 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4757 | #endif |
545587ee DJ |
4758 | |
4759 | if (res == 0) | |
4760 | { | |
4761 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4762 | regset->fill_function (regcache, buf); |
545587ee DJ |
4763 | |
4764 | /* Only now do we write the register set. */ | |
dfb64f85 | 4765 | #ifndef __sparc__ |
f15f9948 | 4766 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4767 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4768 | #else |
1570b33e | 4769 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4770 | #endif |
545587ee DJ |
4771 | } |
4772 | ||
58caa3dc DJ |
4773 | if (res < 0) |
4774 | { | |
4775 | if (errno == EIO) | |
4776 | { | |
52fa2412 | 4777 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4778 | this process mode. */ |
030031ee | 4779 | disable_regset (regsets_info, regset); |
58caa3dc | 4780 | } |
3221518c UW |
4781 | else if (errno == ESRCH) |
4782 | { | |
1b3f6016 PA |
4783 | /* At this point, ESRCH should mean the process is |
4784 | already gone, in which case we simply ignore attempts | |
4785 | to change its registers. See also the related | |
4786 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4787 | free (buf); |
3221518c UW |
4788 | return 0; |
4789 | } | |
58caa3dc DJ |
4790 | else |
4791 | { | |
ce3a066d | 4792 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4793 | } |
4794 | } | |
e9d25b98 DJ |
4795 | else if (regset->type == GENERAL_REGS) |
4796 | saw_general_regs = 1; | |
09ec9b38 | 4797 | free (buf); |
58caa3dc | 4798 | } |
e9d25b98 DJ |
4799 | if (saw_general_regs) |
4800 | return 0; | |
4801 | else | |
4802 | return 1; | |
58caa3dc DJ |
4803 | } |
4804 | ||
1faeff08 | 4805 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4806 | |
1faeff08 | 4807 | #define use_linux_regsets 0 |
3aee8918 PA |
4808 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4809 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4810 | |
58caa3dc | 4811 | #endif |
1faeff08 MR |
4812 | |
4813 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4814 | calls or 0 if it has to be transferred individually. */ | |
4815 | ||
4816 | static int | |
3aee8918 | 4817 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4818 | { |
4819 | unsigned char mask = 1 << (regno % 8); | |
4820 | size_t index = regno / 8; | |
4821 | ||
4822 | return (use_linux_regsets | |
3aee8918 PA |
4823 | && (regs_info->regset_bitmap == NULL |
4824 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4825 | } |
4826 | ||
58caa3dc | 4827 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4828 | |
4829 | int | |
3aee8918 | 4830 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4831 | { |
4832 | int addr; | |
4833 | ||
3aee8918 | 4834 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4835 | error ("Invalid register number %d.", regnum); |
4836 | ||
3aee8918 | 4837 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4838 | |
4839 | return addr; | |
4840 | } | |
4841 | ||
4842 | /* Fetch one register. */ | |
4843 | static void | |
3aee8918 PA |
4844 | fetch_register (const struct usrregs_info *usrregs, |
4845 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4846 | { |
4847 | CORE_ADDR regaddr; | |
4848 | int i, size; | |
4849 | char *buf; | |
4850 | int pid; | |
4851 | ||
3aee8918 | 4852 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4853 | return; |
4854 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4855 | return; | |
4856 | ||
3aee8918 | 4857 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4858 | if (regaddr == -1) |
4859 | return; | |
4860 | ||
3aee8918 PA |
4861 | size = ((register_size (regcache->tdesc, regno) |
4862 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4863 | & -sizeof (PTRACE_XFER_TYPE)); |
4864 | buf = alloca (size); | |
4865 | ||
0bfdf32f | 4866 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4867 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4868 | { | |
4869 | errno = 0; | |
4870 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4871 | ptrace (PTRACE_PEEKUSER, pid, | |
4872 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4873 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4874 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4875 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4876 | if (errno != 0) | |
4877 | error ("reading register %d: %s", regno, strerror (errno)); | |
4878 | } | |
4879 | ||
4880 | if (the_low_target.supply_ptrace_register) | |
4881 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4882 | else | |
4883 | supply_register (regcache, regno, buf); | |
4884 | } | |
4885 | ||
4886 | /* Store one register. */ | |
4887 | static void | |
3aee8918 PA |
4888 | store_register (const struct usrregs_info *usrregs, |
4889 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4890 | { |
4891 | CORE_ADDR regaddr; | |
4892 | int i, size; | |
4893 | char *buf; | |
4894 | int pid; | |
4895 | ||
3aee8918 | 4896 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4897 | return; |
4898 | if ((*the_low_target.cannot_store_register) (regno)) | |
4899 | return; | |
4900 | ||
3aee8918 | 4901 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4902 | if (regaddr == -1) |
4903 | return; | |
4904 | ||
3aee8918 PA |
4905 | size = ((register_size (regcache->tdesc, regno) |
4906 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4907 | & -sizeof (PTRACE_XFER_TYPE)); |
4908 | buf = alloca (size); | |
4909 | memset (buf, 0, size); | |
4910 | ||
4911 | if (the_low_target.collect_ptrace_register) | |
4912 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4913 | else | |
4914 | collect_register (regcache, regno, buf); | |
4915 | ||
0bfdf32f | 4916 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4917 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4918 | { | |
4919 | errno = 0; | |
4920 | ptrace (PTRACE_POKEUSER, pid, | |
4921 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4922 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4923 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4924 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4925 | if (errno != 0) |
4926 | { | |
4927 | /* At this point, ESRCH should mean the process is | |
4928 | already gone, in which case we simply ignore attempts | |
4929 | to change its registers. See also the related | |
4930 | comment in linux_resume_one_lwp. */ | |
4931 | if (errno == ESRCH) | |
4932 | return; | |
4933 | ||
4934 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4935 | error ("writing register %d: %s", regno, strerror (errno)); | |
4936 | } | |
4937 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4938 | } | |
4939 | } | |
4940 | ||
4941 | /* Fetch all registers, or just one, from the child process. | |
4942 | If REGNO is -1, do this for all registers, skipping any that are | |
4943 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4944 | unless ALL is non-zero. | |
4945 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4946 | static void | |
3aee8918 PA |
4947 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4948 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4949 | { |
3aee8918 PA |
4950 | struct usrregs_info *usr = regs_info->usrregs; |
4951 | ||
1faeff08 MR |
4952 | if (regno == -1) |
4953 | { | |
3aee8918 PA |
4954 | for (regno = 0; regno < usr->num_regs; regno++) |
4955 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4956 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4957 | } |
4958 | else | |
3aee8918 | 4959 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4960 | } |
4961 | ||
4962 | /* Store our register values back into the inferior. | |
4963 | If REGNO is -1, do this for all registers, skipping any that are | |
4964 | assumed to have been saved by regsets_store_inferior_registers, | |
4965 | unless ALL is non-zero. | |
4966 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4967 | static void | |
3aee8918 PA |
4968 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4969 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4970 | { |
3aee8918 PA |
4971 | struct usrregs_info *usr = regs_info->usrregs; |
4972 | ||
1faeff08 MR |
4973 | if (regno == -1) |
4974 | { | |
3aee8918 PA |
4975 | for (regno = 0; regno < usr->num_regs; regno++) |
4976 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4977 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4978 | } |
4979 | else | |
3aee8918 | 4980 | store_register (usr, regcache, regno); |
1faeff08 MR |
4981 | } |
4982 | ||
4983 | #else /* !HAVE_LINUX_USRREGS */ | |
4984 | ||
3aee8918 PA |
4985 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4986 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4987 | |
58caa3dc | 4988 | #endif |
1faeff08 MR |
4989 | |
4990 | ||
4991 | void | |
4992 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4993 | { | |
4994 | int use_regsets; | |
4995 | int all = 0; | |
3aee8918 | 4996 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4997 | |
4998 | if (regno == -1) | |
4999 | { | |
3aee8918 PA |
5000 | if (the_low_target.fetch_register != NULL |
5001 | && regs_info->usrregs != NULL) | |
5002 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
5003 | (*the_low_target.fetch_register) (regcache, regno); |
5004 | ||
3aee8918 PA |
5005 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5006 | if (regs_info->usrregs != NULL) | |
5007 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5008 | } |
5009 | else | |
5010 | { | |
c14dfd32 PA |
5011 | if (the_low_target.fetch_register != NULL |
5012 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5013 | return; | |
5014 | ||
3aee8918 | 5015 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5016 | if (use_regsets) |
3aee8918 PA |
5017 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5018 | regcache); | |
5019 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5020 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5021 | } |
58caa3dc DJ |
5022 | } |
5023 | ||
5024 | void | |
442ea881 | 5025 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 5026 | { |
1faeff08 MR |
5027 | int use_regsets; |
5028 | int all = 0; | |
3aee8918 | 5029 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5030 | |
5031 | if (regno == -1) | |
5032 | { | |
3aee8918 PA |
5033 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5034 | regcache); | |
5035 | if (regs_info->usrregs != NULL) | |
5036 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5037 | } |
5038 | else | |
5039 | { | |
3aee8918 | 5040 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5041 | if (use_regsets) |
3aee8918 PA |
5042 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5043 | regcache); | |
5044 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5045 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5046 | } |
58caa3dc DJ |
5047 | } |
5048 | ||
da6d8c04 | 5049 | |
da6d8c04 DJ |
5050 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5051 | to debugger memory starting at MYADDR. */ | |
5052 | ||
c3e735a6 | 5053 | static int |
f450004a | 5054 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5055 | { |
0bfdf32f | 5056 | int pid = lwpid_of (current_thread); |
4934b29e MR |
5057 | register PTRACE_XFER_TYPE *buffer; |
5058 | register CORE_ADDR addr; | |
5059 | register int count; | |
5060 | char filename[64]; | |
da6d8c04 | 5061 | register int i; |
4934b29e | 5062 | int ret; |
fd462a61 | 5063 | int fd; |
fd462a61 DJ |
5064 | |
5065 | /* Try using /proc. Don't bother for one word. */ | |
5066 | if (len >= 3 * sizeof (long)) | |
5067 | { | |
4934b29e MR |
5068 | int bytes; |
5069 | ||
fd462a61 DJ |
5070 | /* We could keep this file open and cache it - possibly one per |
5071 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5072 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5073 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5074 | if (fd == -1) | |
5075 | goto no_proc; | |
5076 | ||
5077 | /* If pread64 is available, use it. It's faster if the kernel | |
5078 | supports it (only one syscall), and it's 64-bit safe even on | |
5079 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5080 | application). */ | |
5081 | #ifdef HAVE_PREAD64 | |
4934b29e | 5082 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5083 | #else |
4934b29e MR |
5084 | bytes = -1; |
5085 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5086 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5087 | #endif |
fd462a61 DJ |
5088 | |
5089 | close (fd); | |
4934b29e MR |
5090 | if (bytes == len) |
5091 | return 0; | |
5092 | ||
5093 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5094 | if (bytes > 0) | |
5095 | { | |
5096 | memaddr += bytes; | |
5097 | myaddr += bytes; | |
5098 | len -= bytes; | |
5099 | } | |
fd462a61 | 5100 | } |
da6d8c04 | 5101 | |
fd462a61 | 5102 | no_proc: |
4934b29e MR |
5103 | /* Round starting address down to longword boundary. */ |
5104 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5105 | /* Round ending address up; get number of longwords that makes. */ | |
5106 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5107 | / sizeof (PTRACE_XFER_TYPE)); | |
5108 | /* Allocate buffer of that many longwords. */ | |
5109 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
5110 | ||
da6d8c04 | 5111 | /* Read all the longwords */ |
4934b29e | 5112 | errno = 0; |
da6d8c04 DJ |
5113 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5114 | { | |
14ce3065 DE |
5115 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5116 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5117 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5118 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5119 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5120 | if (errno) |
4934b29e | 5121 | break; |
da6d8c04 | 5122 | } |
4934b29e | 5123 | ret = errno; |
da6d8c04 DJ |
5124 | |
5125 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5126 | if (i > 0) |
5127 | { | |
5128 | i *= sizeof (PTRACE_XFER_TYPE); | |
5129 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5130 | memcpy (myaddr, | |
5131 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5132 | i < len ? i : len); | |
5133 | } | |
c3e735a6 | 5134 | |
4934b29e | 5135 | return ret; |
da6d8c04 DJ |
5136 | } |
5137 | ||
93ae6fdc PA |
5138 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5139 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5140 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5141 | |
ce3a066d | 5142 | static int |
f450004a | 5143 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
5144 | { |
5145 | register int i; | |
5146 | /* Round starting address down to longword boundary. */ | |
5147 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5148 | /* Round ending address up; get number of longwords that makes. */ | |
5149 | register int count | |
493e2a69 MS |
5150 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5151 | / sizeof (PTRACE_XFER_TYPE); | |
5152 | ||
da6d8c04 | 5153 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
5154 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
5155 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
5156 | ||
0bfdf32f | 5157 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5158 | |
f0ae6fc3 PA |
5159 | if (len == 0) |
5160 | { | |
5161 | /* Zero length write always succeeds. */ | |
5162 | return 0; | |
5163 | } | |
5164 | ||
0d62e5e8 DJ |
5165 | if (debug_threads) |
5166 | { | |
58d6951d DJ |
5167 | /* Dump up to four bytes. */ |
5168 | unsigned int val = * (unsigned int *) myaddr; | |
5169 | if (len == 1) | |
5170 | val = val & 0xff; | |
5171 | else if (len == 2) | |
5172 | val = val & 0xffff; | |
5173 | else if (len == 3) | |
5174 | val = val & 0xffffff; | |
de0d863e DB |
5175 | debug_printf ("Writing %0*x to 0x%08lx in process %d\n", |
5176 | 2 * ((len < 4) ? len : 4), val, (long)memaddr, pid); | |
0d62e5e8 DJ |
5177 | } |
5178 | ||
da6d8c04 DJ |
5179 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5180 | ||
93ae6fdc | 5181 | errno = 0; |
14ce3065 DE |
5182 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5183 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5184 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5185 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5186 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5187 | if (errno) |
5188 | return errno; | |
da6d8c04 DJ |
5189 | |
5190 | if (count > 1) | |
5191 | { | |
93ae6fdc | 5192 | errno = 0; |
da6d8c04 | 5193 | buffer[count - 1] |
95954743 | 5194 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5195 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5196 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5197 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5198 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5199 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5200 | if (errno) |
5201 | return errno; | |
da6d8c04 DJ |
5202 | } |
5203 | ||
93ae6fdc | 5204 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5205 | |
493e2a69 MS |
5206 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5207 | myaddr, len); | |
da6d8c04 DJ |
5208 | |
5209 | /* Write the entire buffer. */ | |
5210 | ||
5211 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5212 | { | |
5213 | errno = 0; | |
14ce3065 DE |
5214 | ptrace (PTRACE_POKETEXT, pid, |
5215 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5216 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5217 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5218 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5219 | if (errno) |
5220 | return errno; | |
5221 | } | |
5222 | ||
5223 | return 0; | |
5224 | } | |
2f2893d9 DJ |
5225 | |
5226 | static void | |
5227 | linux_look_up_symbols (void) | |
5228 | { | |
0d62e5e8 | 5229 | #ifdef USE_THREAD_DB |
95954743 PA |
5230 | struct process_info *proc = current_process (); |
5231 | ||
fe978cb0 | 5232 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5233 | return; |
5234 | ||
96d7229d LM |
5235 | /* If the kernel supports tracing clones, then we don't need to |
5236 | use the magic thread event breakpoint to learn about | |
5237 | threads. */ | |
5238 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
5239 | #endif |
5240 | } | |
5241 | ||
e5379b03 | 5242 | static void |
ef57601b | 5243 | linux_request_interrupt (void) |
e5379b03 | 5244 | { |
a1928bad | 5245 | extern unsigned long signal_pid; |
e5379b03 | 5246 | |
78708b7c PA |
5247 | /* Send a SIGINT to the process group. This acts just like the user |
5248 | typed a ^C on the controlling terminal. */ | |
5249 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
5250 | } |
5251 | ||
aa691b87 RM |
5252 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5253 | to debugger memory starting at MYADDR. */ | |
5254 | ||
5255 | static int | |
f450004a | 5256 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
5257 | { |
5258 | char filename[PATH_MAX]; | |
5259 | int fd, n; | |
0bfdf32f | 5260 | int pid = lwpid_of (current_thread); |
aa691b87 | 5261 | |
6cebaf6e | 5262 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5263 | |
5264 | fd = open (filename, O_RDONLY); | |
5265 | if (fd < 0) | |
5266 | return -1; | |
5267 | ||
5268 | if (offset != (CORE_ADDR) 0 | |
5269 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5270 | n = -1; | |
5271 | else | |
5272 | n = read (fd, myaddr, len); | |
5273 | ||
5274 | close (fd); | |
5275 | ||
5276 | return n; | |
5277 | } | |
5278 | ||
d993e290 PA |
5279 | /* These breakpoint and watchpoint related wrapper functions simply |
5280 | pass on the function call if the target has registered a | |
5281 | corresponding function. */ | |
e013ee27 OF |
5282 | |
5283 | static int | |
802e8e6d PA |
5284 | linux_supports_z_point_type (char z_type) |
5285 | { | |
5286 | return (the_low_target.supports_z_point_type != NULL | |
5287 | && the_low_target.supports_z_point_type (z_type)); | |
5288 | } | |
5289 | ||
5290 | static int | |
5291 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5292 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5293 | { |
c8f4bfdd YQ |
5294 | if (type == raw_bkpt_type_sw) |
5295 | return insert_memory_breakpoint (bp); | |
5296 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 5297 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5298 | else |
5299 | /* Unsupported (see target.h). */ | |
5300 | return 1; | |
5301 | } | |
5302 | ||
5303 | static int | |
802e8e6d PA |
5304 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
5305 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5306 | { |
c8f4bfdd YQ |
5307 | if (type == raw_bkpt_type_sw) |
5308 | return remove_memory_breakpoint (bp); | |
5309 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 5310 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5311 | else |
5312 | /* Unsupported (see target.h). */ | |
5313 | return 1; | |
5314 | } | |
5315 | ||
3e572f71 PA |
5316 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
5317 | method. */ | |
5318 | ||
5319 | static int | |
5320 | linux_stopped_by_sw_breakpoint (void) | |
5321 | { | |
5322 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5323 | ||
5324 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5325 | } | |
5326 | ||
5327 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
5328 | method. */ | |
5329 | ||
5330 | static int | |
5331 | linux_supports_stopped_by_sw_breakpoint (void) | |
5332 | { | |
5333 | return USE_SIGTRAP_SIGINFO; | |
5334 | } | |
5335 | ||
5336 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
5337 | method. */ | |
5338 | ||
5339 | static int | |
5340 | linux_stopped_by_hw_breakpoint (void) | |
5341 | { | |
5342 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5343 | ||
5344 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5345 | } | |
5346 | ||
5347 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
5348 | method. */ | |
5349 | ||
5350 | static int | |
5351 | linux_supports_stopped_by_hw_breakpoint (void) | |
5352 | { | |
5353 | return USE_SIGTRAP_SIGINFO; | |
5354 | } | |
5355 | ||
45614f15 YQ |
5356 | /* Implement the supports_conditional_breakpoints target_ops |
5357 | method. */ | |
5358 | ||
5359 | static int | |
5360 | linux_supports_conditional_breakpoints (void) | |
5361 | { | |
5362 | /* GDBserver needs to step over the breakpoint if the condition is | |
5363 | false. GDBserver software single step is too simple, so disable | |
5364 | conditional breakpoints if the target doesn't have hardware single | |
5365 | step. */ | |
5366 | return can_hardware_single_step (); | |
5367 | } | |
5368 | ||
e013ee27 OF |
5369 | static int |
5370 | linux_stopped_by_watchpoint (void) | |
5371 | { | |
0bfdf32f | 5372 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5373 | |
15c66dd6 | 5374 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5375 | } |
5376 | ||
5377 | static CORE_ADDR | |
5378 | linux_stopped_data_address (void) | |
5379 | { | |
0bfdf32f | 5380 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5381 | |
5382 | return lwp->stopped_data_address; | |
e013ee27 OF |
5383 | } |
5384 | ||
db0dfaa0 LM |
5385 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5386 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5387 | && defined(PT_TEXT_END_ADDR) | |
5388 | ||
5389 | /* This is only used for targets that define PT_TEXT_ADDR, | |
5390 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5391 | the target has different ways of acquiring this information, like | |
5392 | loadmaps. */ | |
52fb6437 NS |
5393 | |
5394 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
5395 | to tell gdb about. */ | |
5396 | ||
5397 | static int | |
5398 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
5399 | { | |
52fb6437 | 5400 | unsigned long text, text_end, data; |
62828379 | 5401 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5402 | |
5403 | errno = 0; | |
5404 | ||
b8e1b30e LM |
5405 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5406 | (PTRACE_TYPE_ARG4) 0); | |
5407 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5408 | (PTRACE_TYPE_ARG4) 0); | |
5409 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5410 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5411 | |
5412 | if (errno == 0) | |
5413 | { | |
5414 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5415 | used by gdb) are relative to the beginning of the program, |
5416 | with the data segment immediately following the text segment. | |
5417 | However, the actual runtime layout in memory may put the data | |
5418 | somewhere else, so when we send gdb a data base-address, we | |
5419 | use the real data base address and subtract the compile-time | |
5420 | data base-address from it (which is just the length of the | |
5421 | text segment). BSS immediately follows data in both | |
5422 | cases. */ | |
52fb6437 NS |
5423 | *text_p = text; |
5424 | *data_p = data - (text_end - text); | |
1b3f6016 | 5425 | |
52fb6437 NS |
5426 | return 1; |
5427 | } | |
52fb6437 NS |
5428 | return 0; |
5429 | } | |
5430 | #endif | |
5431 | ||
07e059b5 VP |
5432 | static int |
5433 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
5434 | unsigned char *readbuf, unsigned const char *writebuf, |
5435 | CORE_ADDR offset, int len) | |
07e059b5 | 5436 | { |
d26e3629 | 5437 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5438 | } |
5439 | ||
d0722149 DE |
5440 | /* Convert a native/host siginfo object, into/from the siginfo in the |
5441 | layout of the inferiors' architecture. */ | |
5442 | ||
5443 | static void | |
a5362b9a | 5444 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
5445 | { |
5446 | int done = 0; | |
5447 | ||
5448 | if (the_low_target.siginfo_fixup != NULL) | |
5449 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
5450 | ||
5451 | /* If there was no callback, or the callback didn't do anything, | |
5452 | then just do a straight memcpy. */ | |
5453 | if (!done) | |
5454 | { | |
5455 | if (direction == 1) | |
a5362b9a | 5456 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5457 | else |
a5362b9a | 5458 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5459 | } |
5460 | } | |
5461 | ||
4aa995e1 PA |
5462 | static int |
5463 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5464 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5465 | { | |
d0722149 | 5466 | int pid; |
a5362b9a TS |
5467 | siginfo_t siginfo; |
5468 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 5469 | |
0bfdf32f | 5470 | if (current_thread == NULL) |
4aa995e1 PA |
5471 | return -1; |
5472 | ||
0bfdf32f | 5473 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
5474 | |
5475 | if (debug_threads) | |
87ce2a04 DE |
5476 | debug_printf ("%s siginfo for lwp %d.\n", |
5477 | readbuf != NULL ? "Reading" : "Writing", | |
5478 | pid); | |
4aa995e1 | 5479 | |
0adea5f7 | 5480 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5481 | return -1; |
5482 | ||
b8e1b30e | 5483 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5484 | return -1; |
5485 | ||
d0722149 DE |
5486 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5487 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5488 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5489 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5490 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5491 | ||
4aa995e1 PA |
5492 | if (offset + len > sizeof (siginfo)) |
5493 | len = sizeof (siginfo) - offset; | |
5494 | ||
5495 | if (readbuf != NULL) | |
d0722149 | 5496 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5497 | else |
5498 | { | |
d0722149 DE |
5499 | memcpy (inf_siginfo + offset, writebuf, len); |
5500 | ||
5501 | /* Convert back to ptrace layout before flushing it out. */ | |
5502 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5503 | ||
b8e1b30e | 5504 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5505 | return -1; |
5506 | } | |
5507 | ||
5508 | return len; | |
5509 | } | |
5510 | ||
bd99dc85 PA |
5511 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5512 | so we notice when children change state; as the handler for the | |
5513 | sigsuspend in my_waitpid. */ | |
5514 | ||
5515 | static void | |
5516 | sigchld_handler (int signo) | |
5517 | { | |
5518 | int old_errno = errno; | |
5519 | ||
5520 | if (debug_threads) | |
e581f2b4 PA |
5521 | { |
5522 | do | |
5523 | { | |
5524 | /* fprintf is not async-signal-safe, so call write | |
5525 | directly. */ | |
5526 | if (write (2, "sigchld_handler\n", | |
5527 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5528 | break; /* just ignore */ | |
5529 | } while (0); | |
5530 | } | |
bd99dc85 PA |
5531 | |
5532 | if (target_is_async_p ()) | |
5533 | async_file_mark (); /* trigger a linux_wait */ | |
5534 | ||
5535 | errno = old_errno; | |
5536 | } | |
5537 | ||
5538 | static int | |
5539 | linux_supports_non_stop (void) | |
5540 | { | |
5541 | return 1; | |
5542 | } | |
5543 | ||
5544 | static int | |
5545 | linux_async (int enable) | |
5546 | { | |
7089dca4 | 5547 | int previous = target_is_async_p (); |
bd99dc85 | 5548 | |
8336d594 | 5549 | if (debug_threads) |
87ce2a04 DE |
5550 | debug_printf ("linux_async (%d), previous=%d\n", |
5551 | enable, previous); | |
8336d594 | 5552 | |
bd99dc85 PA |
5553 | if (previous != enable) |
5554 | { | |
5555 | sigset_t mask; | |
5556 | sigemptyset (&mask); | |
5557 | sigaddset (&mask, SIGCHLD); | |
5558 | ||
5559 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5560 | ||
5561 | if (enable) | |
5562 | { | |
5563 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5564 | { |
5565 | linux_event_pipe[0] = -1; | |
5566 | linux_event_pipe[1] = -1; | |
5567 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5568 | ||
5569 | warning ("creating event pipe failed."); | |
5570 | return previous; | |
5571 | } | |
bd99dc85 PA |
5572 | |
5573 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5574 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5575 | ||
5576 | /* Register the event loop handler. */ | |
5577 | add_file_handler (linux_event_pipe[0], | |
5578 | handle_target_event, NULL); | |
5579 | ||
5580 | /* Always trigger a linux_wait. */ | |
5581 | async_file_mark (); | |
5582 | } | |
5583 | else | |
5584 | { | |
5585 | delete_file_handler (linux_event_pipe[0]); | |
5586 | ||
5587 | close (linux_event_pipe[0]); | |
5588 | close (linux_event_pipe[1]); | |
5589 | linux_event_pipe[0] = -1; | |
5590 | linux_event_pipe[1] = -1; | |
5591 | } | |
5592 | ||
5593 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5594 | } | |
5595 | ||
5596 | return previous; | |
5597 | } | |
5598 | ||
5599 | static int | |
5600 | linux_start_non_stop (int nonstop) | |
5601 | { | |
5602 | /* Register or unregister from event-loop accordingly. */ | |
5603 | linux_async (nonstop); | |
aa96c426 GB |
5604 | |
5605 | if (target_is_async_p () != (nonstop != 0)) | |
5606 | return -1; | |
5607 | ||
bd99dc85 PA |
5608 | return 0; |
5609 | } | |
5610 | ||
cf8fd78b PA |
5611 | static int |
5612 | linux_supports_multi_process (void) | |
5613 | { | |
5614 | return 1; | |
5615 | } | |
5616 | ||
89245bc0 DB |
5617 | /* Check if fork events are supported. */ |
5618 | ||
5619 | static int | |
5620 | linux_supports_fork_events (void) | |
5621 | { | |
5622 | return linux_supports_tracefork (); | |
5623 | } | |
5624 | ||
5625 | /* Check if vfork events are supported. */ | |
5626 | ||
5627 | static int | |
5628 | linux_supports_vfork_events (void) | |
5629 | { | |
5630 | return linux_supports_tracefork (); | |
5631 | } | |
5632 | ||
de0d863e DB |
5633 | /* Callback for 'find_inferior'. Set the (possibly changed) ptrace |
5634 | options for the specified lwp. */ | |
5635 | ||
5636 | static int | |
5637 | reset_lwp_ptrace_options_callback (struct inferior_list_entry *entry, | |
5638 | void *args) | |
5639 | { | |
5640 | struct thread_info *thread = (struct thread_info *) entry; | |
5641 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5642 | ||
5643 | if (!lwp->stopped) | |
5644 | { | |
5645 | /* Stop the lwp so we can modify its ptrace options. */ | |
5646 | lwp->must_set_ptrace_flags = 1; | |
5647 | linux_stop_lwp (lwp); | |
5648 | } | |
5649 | else | |
5650 | { | |
5651 | /* Already stopped; go ahead and set the ptrace options. */ | |
5652 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
5653 | int options = linux_low_ptrace_options (proc->attached); | |
5654 | ||
5655 | linux_enable_event_reporting (lwpid_of (thread), options); | |
5656 | lwp->must_set_ptrace_flags = 0; | |
5657 | } | |
5658 | ||
5659 | return 0; | |
5660 | } | |
5661 | ||
5662 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the | |
5663 | ptrace flags for all inferiors. This is in case the new GDB connection | |
5664 | doesn't support the same set of events that the previous one did. */ | |
5665 | ||
5666 | static void | |
5667 | linux_handle_new_gdb_connection (void) | |
5668 | { | |
5669 | pid_t pid; | |
5670 | ||
5671 | /* Request that all the lwps reset their ptrace options. */ | |
5672 | find_inferior (&all_threads, reset_lwp_ptrace_options_callback , &pid); | |
5673 | } | |
5674 | ||
03583c20 UW |
5675 | static int |
5676 | linux_supports_disable_randomization (void) | |
5677 | { | |
5678 | #ifdef HAVE_PERSONALITY | |
5679 | return 1; | |
5680 | #else | |
5681 | return 0; | |
5682 | #endif | |
5683 | } | |
efcbbd14 | 5684 | |
d1feda86 YQ |
5685 | static int |
5686 | linux_supports_agent (void) | |
5687 | { | |
5688 | return 1; | |
5689 | } | |
5690 | ||
c2d6af84 PA |
5691 | static int |
5692 | linux_supports_range_stepping (void) | |
5693 | { | |
5694 | if (*the_low_target.supports_range_stepping == NULL) | |
5695 | return 0; | |
5696 | ||
5697 | return (*the_low_target.supports_range_stepping) (); | |
5698 | } | |
5699 | ||
efcbbd14 UW |
5700 | /* Enumerate spufs IDs for process PID. */ |
5701 | static int | |
5702 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5703 | { | |
5704 | int pos = 0; | |
5705 | int written = 0; | |
5706 | char path[128]; | |
5707 | DIR *dir; | |
5708 | struct dirent *entry; | |
5709 | ||
5710 | sprintf (path, "/proc/%ld/fd", pid); | |
5711 | dir = opendir (path); | |
5712 | if (!dir) | |
5713 | return -1; | |
5714 | ||
5715 | rewinddir (dir); | |
5716 | while ((entry = readdir (dir)) != NULL) | |
5717 | { | |
5718 | struct stat st; | |
5719 | struct statfs stfs; | |
5720 | int fd; | |
5721 | ||
5722 | fd = atoi (entry->d_name); | |
5723 | if (!fd) | |
5724 | continue; | |
5725 | ||
5726 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5727 | if (stat (path, &st) != 0) | |
5728 | continue; | |
5729 | if (!S_ISDIR (st.st_mode)) | |
5730 | continue; | |
5731 | ||
5732 | if (statfs (path, &stfs) != 0) | |
5733 | continue; | |
5734 | if (stfs.f_type != SPUFS_MAGIC) | |
5735 | continue; | |
5736 | ||
5737 | if (pos >= offset && pos + 4 <= offset + len) | |
5738 | { | |
5739 | *(unsigned int *)(buf + pos - offset) = fd; | |
5740 | written += 4; | |
5741 | } | |
5742 | pos += 4; | |
5743 | } | |
5744 | ||
5745 | closedir (dir); | |
5746 | return written; | |
5747 | } | |
5748 | ||
5749 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5750 | object type, using the /proc file system. */ | |
5751 | static int | |
5752 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5753 | unsigned const char *writebuf, | |
5754 | CORE_ADDR offset, int len) | |
5755 | { | |
0bfdf32f | 5756 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
5757 | char buf[128]; |
5758 | int fd = 0; | |
5759 | int ret = 0; | |
5760 | ||
5761 | if (!writebuf && !readbuf) | |
5762 | return -1; | |
5763 | ||
5764 | if (!*annex) | |
5765 | { | |
5766 | if (!readbuf) | |
5767 | return -1; | |
5768 | else | |
5769 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5770 | } | |
5771 | ||
5772 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5773 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5774 | if (fd <= 0) | |
5775 | return -1; | |
5776 | ||
5777 | if (offset != 0 | |
5778 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5779 | { | |
5780 | close (fd); | |
5781 | return 0; | |
5782 | } | |
5783 | ||
5784 | if (writebuf) | |
5785 | ret = write (fd, writebuf, (size_t) len); | |
5786 | else | |
5787 | ret = read (fd, readbuf, (size_t) len); | |
5788 | ||
5789 | close (fd); | |
5790 | return ret; | |
5791 | } | |
5792 | ||
723b724b | 5793 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5794 | struct target_loadseg |
5795 | { | |
5796 | /* Core address to which the segment is mapped. */ | |
5797 | Elf32_Addr addr; | |
5798 | /* VMA recorded in the program header. */ | |
5799 | Elf32_Addr p_vaddr; | |
5800 | /* Size of this segment in memory. */ | |
5801 | Elf32_Word p_memsz; | |
5802 | }; | |
5803 | ||
723b724b | 5804 | # if defined PT_GETDSBT |
78d85199 YQ |
5805 | struct target_loadmap |
5806 | { | |
5807 | /* Protocol version number, must be zero. */ | |
5808 | Elf32_Word version; | |
5809 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5810 | unsigned *dsbt_table; | |
5811 | unsigned dsbt_size, dsbt_index; | |
5812 | /* Number of segments in this map. */ | |
5813 | Elf32_Word nsegs; | |
5814 | /* The actual memory map. */ | |
5815 | struct target_loadseg segs[/*nsegs*/]; | |
5816 | }; | |
723b724b MF |
5817 | # define LINUX_LOADMAP PT_GETDSBT |
5818 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5819 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5820 | # else | |
5821 | struct target_loadmap | |
5822 | { | |
5823 | /* Protocol version number, must be zero. */ | |
5824 | Elf32_Half version; | |
5825 | /* Number of segments in this map. */ | |
5826 | Elf32_Half nsegs; | |
5827 | /* The actual memory map. */ | |
5828 | struct target_loadseg segs[/*nsegs*/]; | |
5829 | }; | |
5830 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5831 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5832 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5833 | # endif | |
78d85199 | 5834 | |
78d85199 YQ |
5835 | static int |
5836 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5837 | unsigned char *myaddr, unsigned int len) | |
5838 | { | |
0bfdf32f | 5839 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
5840 | int addr = -1; |
5841 | struct target_loadmap *data = NULL; | |
5842 | unsigned int actual_length, copy_length; | |
5843 | ||
5844 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5845 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5846 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5847 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5848 | else |
5849 | return -1; | |
5850 | ||
723b724b | 5851 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5852 | return -1; |
5853 | ||
5854 | if (data == NULL) | |
5855 | return -1; | |
5856 | ||
5857 | actual_length = sizeof (struct target_loadmap) | |
5858 | + sizeof (struct target_loadseg) * data->nsegs; | |
5859 | ||
5860 | if (offset < 0 || offset > actual_length) | |
5861 | return -1; | |
5862 | ||
5863 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5864 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5865 | return copy_length; | |
5866 | } | |
723b724b MF |
5867 | #else |
5868 | # define linux_read_loadmap NULL | |
5869 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5870 | |
1570b33e L |
5871 | static void |
5872 | linux_process_qsupported (const char *query) | |
5873 | { | |
5874 | if (the_low_target.process_qsupported != NULL) | |
5875 | the_low_target.process_qsupported (query); | |
5876 | } | |
5877 | ||
219f2f23 PA |
5878 | static int |
5879 | linux_supports_tracepoints (void) | |
5880 | { | |
5881 | if (*the_low_target.supports_tracepoints == NULL) | |
5882 | return 0; | |
5883 | ||
5884 | return (*the_low_target.supports_tracepoints) (); | |
5885 | } | |
5886 | ||
5887 | static CORE_ADDR | |
5888 | linux_read_pc (struct regcache *regcache) | |
5889 | { | |
5890 | if (the_low_target.get_pc == NULL) | |
5891 | return 0; | |
5892 | ||
5893 | return (*the_low_target.get_pc) (regcache); | |
5894 | } | |
5895 | ||
5896 | static void | |
5897 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5898 | { | |
5899 | gdb_assert (the_low_target.set_pc != NULL); | |
5900 | ||
5901 | (*the_low_target.set_pc) (regcache, pc); | |
5902 | } | |
5903 | ||
8336d594 PA |
5904 | static int |
5905 | linux_thread_stopped (struct thread_info *thread) | |
5906 | { | |
5907 | return get_thread_lwp (thread)->stopped; | |
5908 | } | |
5909 | ||
5910 | /* This exposes stop-all-threads functionality to other modules. */ | |
5911 | ||
5912 | static void | |
7984d532 | 5913 | linux_pause_all (int freeze) |
8336d594 | 5914 | { |
7984d532 PA |
5915 | stop_all_lwps (freeze, NULL); |
5916 | } | |
5917 | ||
5918 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5919 | modules. */ | |
5920 | ||
5921 | static void | |
5922 | linux_unpause_all (int unfreeze) | |
5923 | { | |
5924 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5925 | } |
5926 | ||
90d74c30 PA |
5927 | static int |
5928 | linux_prepare_to_access_memory (void) | |
5929 | { | |
5930 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5931 | running LWP. */ | |
5932 | if (non_stop) | |
5933 | linux_pause_all (1); | |
5934 | return 0; | |
5935 | } | |
5936 | ||
5937 | static void | |
0146f85b | 5938 | linux_done_accessing_memory (void) |
90d74c30 PA |
5939 | { |
5940 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5941 | running LWP. */ | |
5942 | if (non_stop) | |
5943 | linux_unpause_all (1); | |
5944 | } | |
5945 | ||
fa593d66 PA |
5946 | static int |
5947 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5948 | CORE_ADDR collector, | |
5949 | CORE_ADDR lockaddr, | |
5950 | ULONGEST orig_size, | |
5951 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5952 | CORE_ADDR *trampoline, |
5953 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5954 | unsigned char *jjump_pad_insn, |
5955 | ULONGEST *jjump_pad_insn_size, | |
5956 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5957 | CORE_ADDR *adjusted_insn_addr_end, |
5958 | char *err) | |
fa593d66 PA |
5959 | { |
5960 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5961 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5962 | jump_entry, trampoline, trampoline_size, |
5963 | jjump_pad_insn, jjump_pad_insn_size, | |
5964 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5965 | err); | |
fa593d66 PA |
5966 | } |
5967 | ||
6a271cae PA |
5968 | static struct emit_ops * |
5969 | linux_emit_ops (void) | |
5970 | { | |
5971 | if (the_low_target.emit_ops != NULL) | |
5972 | return (*the_low_target.emit_ops) (); | |
5973 | else | |
5974 | return NULL; | |
5975 | } | |
5976 | ||
405f8e94 SS |
5977 | static int |
5978 | linux_get_min_fast_tracepoint_insn_len (void) | |
5979 | { | |
5980 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5981 | } | |
5982 | ||
2268b414 JK |
5983 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5984 | ||
5985 | static int | |
5986 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5987 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5988 | { | |
5989 | char filename[PATH_MAX]; | |
5990 | int fd; | |
5991 | const int auxv_size = is_elf64 | |
5992 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5993 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5994 | ||
5995 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5996 | ||
5997 | fd = open (filename, O_RDONLY); | |
5998 | if (fd < 0) | |
5999 | return 1; | |
6000 | ||
6001 | *phdr_memaddr = 0; | |
6002 | *num_phdr = 0; | |
6003 | while (read (fd, buf, auxv_size) == auxv_size | |
6004 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6005 | { | |
6006 | if (is_elf64) | |
6007 | { | |
6008 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6009 | ||
6010 | switch (aux->a_type) | |
6011 | { | |
6012 | case AT_PHDR: | |
6013 | *phdr_memaddr = aux->a_un.a_val; | |
6014 | break; | |
6015 | case AT_PHNUM: | |
6016 | *num_phdr = aux->a_un.a_val; | |
6017 | break; | |
6018 | } | |
6019 | } | |
6020 | else | |
6021 | { | |
6022 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6023 | ||
6024 | switch (aux->a_type) | |
6025 | { | |
6026 | case AT_PHDR: | |
6027 | *phdr_memaddr = aux->a_un.a_val; | |
6028 | break; | |
6029 | case AT_PHNUM: | |
6030 | *num_phdr = aux->a_un.a_val; | |
6031 | break; | |
6032 | } | |
6033 | } | |
6034 | } | |
6035 | ||
6036 | close (fd); | |
6037 | ||
6038 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6039 | { | |
6040 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6041 | "phdr_memaddr = %ld, phdr_num = %d", | |
6042 | (long) *phdr_memaddr, *num_phdr); | |
6043 | return 2; | |
6044 | } | |
6045 | ||
6046 | return 0; | |
6047 | } | |
6048 | ||
6049 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6050 | ||
6051 | static CORE_ADDR | |
6052 | get_dynamic (const int pid, const int is_elf64) | |
6053 | { | |
6054 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6055 | int num_phdr, i; |
2268b414 | 6056 | unsigned char *phdr_buf; |
db1ff28b | 6057 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6058 | |
6059 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6060 | return 0; | |
6061 | ||
6062 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
6063 | phdr_buf = alloca (num_phdr * phdr_size); | |
6064 | ||
6065 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6066 | return 0; | |
6067 | ||
6068 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6069 | non-zero for PIE ones. */ | |
6070 | relocation = -1; | |
db1ff28b JK |
6071 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6072 | if (is_elf64) | |
6073 | { | |
6074 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6075 | ||
6076 | if (p->p_type == PT_PHDR) | |
6077 | relocation = phdr_memaddr - p->p_vaddr; | |
6078 | } | |
6079 | else | |
6080 | { | |
6081 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6082 | ||
6083 | if (p->p_type == PT_PHDR) | |
6084 | relocation = phdr_memaddr - p->p_vaddr; | |
6085 | } | |
6086 | ||
2268b414 JK |
6087 | if (relocation == -1) |
6088 | { | |
e237a7e2 JK |
6089 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6090 | any real world executables, including PIE executables, have always | |
6091 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6092 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6093 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6094 | ||
6095 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6096 | ||
6097 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6098 | ||
2268b414 JK |
6099 | return 0; |
6100 | } | |
6101 | ||
db1ff28b JK |
6102 | for (i = 0; i < num_phdr; i++) |
6103 | { | |
6104 | if (is_elf64) | |
6105 | { | |
6106 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6107 | ||
6108 | if (p->p_type == PT_DYNAMIC) | |
6109 | return p->p_vaddr + relocation; | |
6110 | } | |
6111 | else | |
6112 | { | |
6113 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6114 | |
db1ff28b JK |
6115 | if (p->p_type == PT_DYNAMIC) |
6116 | return p->p_vaddr + relocation; | |
6117 | } | |
6118 | } | |
2268b414 JK |
6119 | |
6120 | return 0; | |
6121 | } | |
6122 | ||
6123 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6124 | can be 0 if the inferior does not yet have the library list initialized. |
6125 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6126 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6127 | |
6128 | static CORE_ADDR | |
6129 | get_r_debug (const int pid, const int is_elf64) | |
6130 | { | |
6131 | CORE_ADDR dynamic_memaddr; | |
6132 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6133 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6134 | CORE_ADDR map = -1; |
2268b414 JK |
6135 | |
6136 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6137 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6138 | return map; |
2268b414 JK |
6139 | |
6140 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6141 | { | |
6142 | if (is_elf64) | |
6143 | { | |
6144 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 6145 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
6146 | union |
6147 | { | |
6148 | Elf64_Xword map; | |
6149 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6150 | } | |
6151 | rld_map; | |
6152 | ||
6153 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
6154 | { | |
6155 | if (linux_read_memory (dyn->d_un.d_val, | |
6156 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6157 | return rld_map.map; | |
6158 | else | |
6159 | break; | |
6160 | } | |
75f62ce7 | 6161 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 6162 | |
367ba2c2 MR |
6163 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6164 | map = dyn->d_un.d_val; | |
2268b414 JK |
6165 | |
6166 | if (dyn->d_tag == DT_NULL) | |
6167 | break; | |
6168 | } | |
6169 | else | |
6170 | { | |
6171 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 6172 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
6173 | union |
6174 | { | |
6175 | Elf32_Word map; | |
6176 | unsigned char buf[sizeof (Elf32_Word)]; | |
6177 | } | |
6178 | rld_map; | |
6179 | ||
6180 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
6181 | { | |
6182 | if (linux_read_memory (dyn->d_un.d_val, | |
6183 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6184 | return rld_map.map; | |
6185 | else | |
6186 | break; | |
6187 | } | |
75f62ce7 | 6188 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 6189 | |
367ba2c2 MR |
6190 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6191 | map = dyn->d_un.d_val; | |
2268b414 JK |
6192 | |
6193 | if (dyn->d_tag == DT_NULL) | |
6194 | break; | |
6195 | } | |
6196 | ||
6197 | dynamic_memaddr += dyn_size; | |
6198 | } | |
6199 | ||
367ba2c2 | 6200 | return map; |
2268b414 JK |
6201 | } |
6202 | ||
6203 | /* Read one pointer from MEMADDR in the inferior. */ | |
6204 | ||
6205 | static int | |
6206 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6207 | { | |
485f1ee4 PA |
6208 | int ret; |
6209 | ||
6210 | /* Go through a union so this works on either big or little endian | |
6211 | hosts, when the inferior's pointer size is smaller than the size | |
6212 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6213 | same of the superior's. */ | |
6214 | union | |
6215 | { | |
6216 | CORE_ADDR core_addr; | |
6217 | unsigned int ui; | |
6218 | unsigned char uc; | |
6219 | } addr; | |
6220 | ||
6221 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6222 | if (ret == 0) | |
6223 | { | |
6224 | if (ptr_size == sizeof (CORE_ADDR)) | |
6225 | *ptr = addr.core_addr; | |
6226 | else if (ptr_size == sizeof (unsigned int)) | |
6227 | *ptr = addr.ui; | |
6228 | else | |
6229 | gdb_assert_not_reached ("unhandled pointer size"); | |
6230 | } | |
6231 | return ret; | |
2268b414 JK |
6232 | } |
6233 | ||
6234 | struct link_map_offsets | |
6235 | { | |
6236 | /* Offset and size of r_debug.r_version. */ | |
6237 | int r_version_offset; | |
6238 | ||
6239 | /* Offset and size of r_debug.r_map. */ | |
6240 | int r_map_offset; | |
6241 | ||
6242 | /* Offset to l_addr field in struct link_map. */ | |
6243 | int l_addr_offset; | |
6244 | ||
6245 | /* Offset to l_name field in struct link_map. */ | |
6246 | int l_name_offset; | |
6247 | ||
6248 | /* Offset to l_ld field in struct link_map. */ | |
6249 | int l_ld_offset; | |
6250 | ||
6251 | /* Offset to l_next field in struct link_map. */ | |
6252 | int l_next_offset; | |
6253 | ||
6254 | /* Offset to l_prev field in struct link_map. */ | |
6255 | int l_prev_offset; | |
6256 | }; | |
6257 | ||
fb723180 | 6258 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
6259 | |
6260 | static int | |
6261 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
6262 | unsigned const char *writebuf, | |
6263 | CORE_ADDR offset, int len) | |
6264 | { | |
6265 | char *document; | |
6266 | unsigned document_len; | |
fe978cb0 | 6267 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6268 | char filename[PATH_MAX]; |
6269 | int pid, is_elf64; | |
6270 | ||
6271 | static const struct link_map_offsets lmo_32bit_offsets = | |
6272 | { | |
6273 | 0, /* r_version offset. */ | |
6274 | 4, /* r_debug.r_map offset. */ | |
6275 | 0, /* l_addr offset in link_map. */ | |
6276 | 4, /* l_name offset in link_map. */ | |
6277 | 8, /* l_ld offset in link_map. */ | |
6278 | 12, /* l_next offset in link_map. */ | |
6279 | 16 /* l_prev offset in link_map. */ | |
6280 | }; | |
6281 | ||
6282 | static const struct link_map_offsets lmo_64bit_offsets = | |
6283 | { | |
6284 | 0, /* r_version offset. */ | |
6285 | 8, /* r_debug.r_map offset. */ | |
6286 | 0, /* l_addr offset in link_map. */ | |
6287 | 8, /* l_name offset in link_map. */ | |
6288 | 16, /* l_ld offset in link_map. */ | |
6289 | 24, /* l_next offset in link_map. */ | |
6290 | 32 /* l_prev offset in link_map. */ | |
6291 | }; | |
6292 | const struct link_map_offsets *lmo; | |
214d508e | 6293 | unsigned int machine; |
b1fbec62 GB |
6294 | int ptr_size; |
6295 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
6296 | int allocated = 1024; | |
6297 | char *p; | |
6298 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
6299 | int header_done = 0; | |
2268b414 JK |
6300 | |
6301 | if (writebuf != NULL) | |
6302 | return -2; | |
6303 | if (readbuf == NULL) | |
6304 | return -1; | |
6305 | ||
0bfdf32f | 6306 | pid = lwpid_of (current_thread); |
2268b414 | 6307 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6308 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6309 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6310 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6311 | |
b1fbec62 GB |
6312 | while (annex[0] != '\0') |
6313 | { | |
6314 | const char *sep; | |
6315 | CORE_ADDR *addrp; | |
6316 | int len; | |
2268b414 | 6317 | |
b1fbec62 GB |
6318 | sep = strchr (annex, '='); |
6319 | if (sep == NULL) | |
6320 | break; | |
0c5bf5a9 | 6321 | |
b1fbec62 | 6322 | len = sep - annex; |
61012eef | 6323 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 6324 | addrp = &lm_addr; |
61012eef | 6325 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6326 | addrp = &lm_prev; |
6327 | else | |
6328 | { | |
6329 | annex = strchr (sep, ';'); | |
6330 | if (annex == NULL) | |
6331 | break; | |
6332 | annex++; | |
6333 | continue; | |
6334 | } | |
6335 | ||
6336 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6337 | } |
b1fbec62 GB |
6338 | |
6339 | if (lm_addr == 0) | |
2268b414 | 6340 | { |
b1fbec62 GB |
6341 | int r_version = 0; |
6342 | ||
6343 | if (priv->r_debug == 0) | |
6344 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6345 | ||
6346 | /* We failed to find DT_DEBUG. Such situation will not change | |
6347 | for this inferior - do not retry it. Report it to GDB as | |
6348 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6349 | if (priv->r_debug == (CORE_ADDR) -1) | |
6350 | return -1; | |
6351 | ||
6352 | if (priv->r_debug != 0) | |
2268b414 | 6353 | { |
b1fbec62 GB |
6354 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6355 | (unsigned char *) &r_version, | |
6356 | sizeof (r_version)) != 0 | |
6357 | || r_version != 1) | |
6358 | { | |
6359 | warning ("unexpected r_debug version %d", r_version); | |
6360 | } | |
6361 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6362 | &lm_addr, ptr_size) != 0) | |
6363 | { | |
6364 | warning ("unable to read r_map from 0x%lx", | |
6365 | (long) priv->r_debug + lmo->r_map_offset); | |
6366 | } | |
2268b414 | 6367 | } |
b1fbec62 | 6368 | } |
2268b414 | 6369 | |
b1fbec62 GB |
6370 | document = xmalloc (allocated); |
6371 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
6372 | p = document + strlen (document); | |
6373 | ||
6374 | while (lm_addr | |
6375 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6376 | &l_name, ptr_size) == 0 | |
6377 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6378 | &l_addr, ptr_size) == 0 | |
6379 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6380 | &l_ld, ptr_size) == 0 | |
6381 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6382 | &l_prev, ptr_size) == 0 | |
6383 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6384 | &l_next, ptr_size) == 0) | |
6385 | { | |
6386 | unsigned char libname[PATH_MAX]; | |
6387 | ||
6388 | if (lm_prev != l_prev) | |
2268b414 | 6389 | { |
b1fbec62 GB |
6390 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6391 | (long) lm_prev, (long) l_prev); | |
6392 | break; | |
2268b414 JK |
6393 | } |
6394 | ||
d878444c JK |
6395 | /* Ignore the first entry even if it has valid name as the first entry |
6396 | corresponds to the main executable. The first entry should not be | |
6397 | skipped if the dynamic loader was loaded late by a static executable | |
6398 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6399 | executable does not have PT_DYNAMIC present and this function already | |
6400 | exited above due to failed get_r_debug. */ | |
6401 | if (lm_prev == 0) | |
2268b414 | 6402 | { |
d878444c JK |
6403 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
6404 | p = p + strlen (p); | |
6405 | } | |
6406 | else | |
6407 | { | |
6408 | /* Not checking for error because reading may stop before | |
6409 | we've got PATH_MAX worth of characters. */ | |
6410 | libname[0] = '\0'; | |
6411 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6412 | libname[sizeof (libname) - 1] = '\0'; | |
6413 | if (libname[0] != '\0') | |
2268b414 | 6414 | { |
d878444c JK |
6415 | /* 6x the size for xml_escape_text below. */ |
6416 | size_t len = 6 * strlen ((char *) libname); | |
6417 | char *name; | |
2268b414 | 6418 | |
d878444c JK |
6419 | if (!header_done) |
6420 | { | |
6421 | /* Terminate `<library-list-svr4'. */ | |
6422 | *p++ = '>'; | |
6423 | header_done = 1; | |
6424 | } | |
2268b414 | 6425 | |
db1ff28b | 6426 | while (allocated < p - document + len + 200) |
d878444c JK |
6427 | { |
6428 | /* Expand to guarantee sufficient storage. */ | |
6429 | uintptr_t document_len = p - document; | |
2268b414 | 6430 | |
d878444c JK |
6431 | document = xrealloc (document, 2 * allocated); |
6432 | allocated *= 2; | |
6433 | p = document + document_len; | |
6434 | } | |
6435 | ||
6436 | name = xml_escape_text ((char *) libname); | |
6437 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
db1ff28b | 6438 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
d878444c JK |
6439 | name, (unsigned long) lm_addr, |
6440 | (unsigned long) l_addr, (unsigned long) l_ld); | |
6441 | free (name); | |
6442 | } | |
0afae3cf | 6443 | } |
b1fbec62 GB |
6444 | |
6445 | lm_prev = lm_addr; | |
6446 | lm_addr = l_next; | |
2268b414 JK |
6447 | } |
6448 | ||
b1fbec62 GB |
6449 | if (!header_done) |
6450 | { | |
6451 | /* Empty list; terminate `<library-list-svr4'. */ | |
6452 | strcpy (p, "/>"); | |
6453 | } | |
6454 | else | |
6455 | strcpy (p, "</library-list-svr4>"); | |
6456 | ||
2268b414 JK |
6457 | document_len = strlen (document); |
6458 | if (offset < document_len) | |
6459 | document_len -= offset; | |
6460 | else | |
6461 | document_len = 0; | |
6462 | if (len > document_len) | |
6463 | len = document_len; | |
6464 | ||
6465 | memcpy (readbuf, document + offset, len); | |
6466 | xfree (document); | |
6467 | ||
6468 | return len; | |
6469 | } | |
6470 | ||
9accd112 MM |
6471 | #ifdef HAVE_LINUX_BTRACE |
6472 | ||
969c39fb | 6473 | /* See to_enable_btrace target method. */ |
9accd112 MM |
6474 | |
6475 | static struct btrace_target_info * | |
f4abbc16 | 6476 | linux_low_enable_btrace (ptid_t ptid, const struct btrace_config *conf) |
9accd112 MM |
6477 | { |
6478 | struct btrace_target_info *tinfo; | |
6479 | ||
f4abbc16 | 6480 | tinfo = linux_enable_btrace (ptid, conf); |
3aee8918 | 6481 | |
d68e53f4 | 6482 | if (tinfo != NULL && tinfo->ptr_bits == 0) |
3aee8918 PA |
6483 | { |
6484 | struct thread_info *thread = find_thread_ptid (ptid); | |
6485 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
6486 | ||
6487 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
6488 | } | |
9accd112 MM |
6489 | |
6490 | return tinfo; | |
6491 | } | |
6492 | ||
969c39fb | 6493 | /* See to_disable_btrace target method. */ |
9accd112 | 6494 | |
969c39fb MM |
6495 | static int |
6496 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
6497 | { | |
6498 | enum btrace_error err; | |
6499 | ||
6500 | err = linux_disable_btrace (tinfo); | |
6501 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6502 | } | |
6503 | ||
b20a6524 MM |
6504 | /* Encode an Intel(R) Processor Trace configuration. */ |
6505 | ||
6506 | static void | |
6507 | linux_low_encode_pt_config (struct buffer *buffer, | |
6508 | const struct btrace_data_pt_config *config) | |
6509 | { | |
6510 | buffer_grow_str (buffer, "<pt-config>\n"); | |
6511 | ||
6512 | switch (config->cpu.vendor) | |
6513 | { | |
6514 | case CV_INTEL: | |
6515 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
6516 | "model=\"%u\" stepping=\"%u\"/>\n", | |
6517 | config->cpu.family, config->cpu.model, | |
6518 | config->cpu.stepping); | |
6519 | break; | |
6520 | ||
6521 | default: | |
6522 | break; | |
6523 | } | |
6524 | ||
6525 | buffer_grow_str (buffer, "</pt-config>\n"); | |
6526 | } | |
6527 | ||
6528 | /* Encode a raw buffer. */ | |
6529 | ||
6530 | static void | |
6531 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
6532 | unsigned int size) | |
6533 | { | |
6534 | if (size == 0) | |
6535 | return; | |
6536 | ||
6537 | /* We use hex encoding - see common/rsp-low.h. */ | |
6538 | buffer_grow_str (buffer, "<raw>\n"); | |
6539 | ||
6540 | while (size-- > 0) | |
6541 | { | |
6542 | char elem[2]; | |
6543 | ||
6544 | elem[0] = tohex ((*data >> 4) & 0xf); | |
6545 | elem[1] = tohex (*data++ & 0xf); | |
6546 | ||
6547 | buffer_grow (buffer, elem, 2); | |
6548 | } | |
6549 | ||
6550 | buffer_grow_str (buffer, "</raw>\n"); | |
6551 | } | |
6552 | ||
969c39fb MM |
6553 | /* See to_read_btrace target method. */ |
6554 | ||
6555 | static int | |
9accd112 MM |
6556 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
6557 | int type) | |
6558 | { | |
734b0e4b | 6559 | struct btrace_data btrace; |
9accd112 | 6560 | struct btrace_block *block; |
969c39fb | 6561 | enum btrace_error err; |
9accd112 MM |
6562 | int i; |
6563 | ||
734b0e4b MM |
6564 | btrace_data_init (&btrace); |
6565 | ||
969c39fb MM |
6566 | err = linux_read_btrace (&btrace, tinfo, type); |
6567 | if (err != BTRACE_ERR_NONE) | |
6568 | { | |
6569 | if (err == BTRACE_ERR_OVERFLOW) | |
6570 | buffer_grow_str0 (buffer, "E.Overflow."); | |
6571 | else | |
6572 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
6573 | ||
b20a6524 | 6574 | goto err; |
969c39fb | 6575 | } |
9accd112 | 6576 | |
734b0e4b MM |
6577 | switch (btrace.format) |
6578 | { | |
6579 | case BTRACE_FORMAT_NONE: | |
6580 | buffer_grow_str0 (buffer, "E.No Trace."); | |
b20a6524 | 6581 | goto err; |
734b0e4b MM |
6582 | |
6583 | case BTRACE_FORMAT_BTS: | |
6584 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6585 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 6586 | |
734b0e4b MM |
6587 | for (i = 0; |
6588 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
6589 | i++) | |
6590 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
6591 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 6592 | |
734b0e4b MM |
6593 | buffer_grow_str0 (buffer, "</btrace>\n"); |
6594 | break; | |
6595 | ||
b20a6524 MM |
6596 | case BTRACE_FORMAT_PT: |
6597 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6598 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
6599 | buffer_grow_str (buffer, "<pt>\n"); | |
6600 | ||
6601 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 6602 | |
b20a6524 MM |
6603 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
6604 | btrace.variant.pt.size); | |
6605 | ||
6606 | buffer_grow_str (buffer, "</pt>\n"); | |
6607 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
6608 | break; | |
6609 | ||
6610 | default: | |
6611 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
6612 | goto err; | |
734b0e4b | 6613 | } |
969c39fb | 6614 | |
734b0e4b | 6615 | btrace_data_fini (&btrace); |
969c39fb | 6616 | return 0; |
b20a6524 MM |
6617 | |
6618 | err: | |
6619 | btrace_data_fini (&btrace); | |
6620 | return -1; | |
9accd112 | 6621 | } |
f4abbc16 MM |
6622 | |
6623 | /* See to_btrace_conf target method. */ | |
6624 | ||
6625 | static int | |
6626 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
6627 | struct buffer *buffer) | |
6628 | { | |
6629 | const struct btrace_config *conf; | |
6630 | ||
6631 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
6632 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
6633 | ||
6634 | conf = linux_btrace_conf (tinfo); | |
6635 | if (conf != NULL) | |
6636 | { | |
6637 | switch (conf->format) | |
6638 | { | |
6639 | case BTRACE_FORMAT_NONE: | |
6640 | break; | |
6641 | ||
6642 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
6643 | buffer_xml_printf (buffer, "<bts"); |
6644 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
6645 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 6646 | break; |
b20a6524 MM |
6647 | |
6648 | case BTRACE_FORMAT_PT: | |
6649 | buffer_xml_printf (buffer, "<pt"); | |
6650 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
6651 | buffer_xml_printf (buffer, "/>\n"); | |
6652 | break; | |
f4abbc16 MM |
6653 | } |
6654 | } | |
6655 | ||
6656 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
6657 | return 0; | |
6658 | } | |
9accd112 MM |
6659 | #endif /* HAVE_LINUX_BTRACE */ |
6660 | ||
7b669087 GB |
6661 | /* See nat/linux-nat.h. */ |
6662 | ||
6663 | ptid_t | |
6664 | current_lwp_ptid (void) | |
6665 | { | |
6666 | return ptid_of (current_thread); | |
6667 | } | |
6668 | ||
ce3a066d DJ |
6669 | static struct target_ops linux_target_ops = { |
6670 | linux_create_inferior, | |
c06cbd92 | 6671 | linux_arch_setup, |
ce3a066d DJ |
6672 | linux_attach, |
6673 | linux_kill, | |
6ad8ae5c | 6674 | linux_detach, |
8336d594 | 6675 | linux_mourn, |
444d6139 | 6676 | linux_join, |
ce3a066d DJ |
6677 | linux_thread_alive, |
6678 | linux_resume, | |
6679 | linux_wait, | |
6680 | linux_fetch_registers, | |
6681 | linux_store_registers, | |
90d74c30 | 6682 | linux_prepare_to_access_memory, |
0146f85b | 6683 | linux_done_accessing_memory, |
ce3a066d DJ |
6684 | linux_read_memory, |
6685 | linux_write_memory, | |
2f2893d9 | 6686 | linux_look_up_symbols, |
ef57601b | 6687 | linux_request_interrupt, |
aa691b87 | 6688 | linux_read_auxv, |
802e8e6d | 6689 | linux_supports_z_point_type, |
d993e290 PA |
6690 | linux_insert_point, |
6691 | linux_remove_point, | |
3e572f71 PA |
6692 | linux_stopped_by_sw_breakpoint, |
6693 | linux_supports_stopped_by_sw_breakpoint, | |
6694 | linux_stopped_by_hw_breakpoint, | |
6695 | linux_supports_stopped_by_hw_breakpoint, | |
45614f15 | 6696 | linux_supports_conditional_breakpoints, |
e013ee27 OF |
6697 | linux_stopped_by_watchpoint, |
6698 | linux_stopped_data_address, | |
db0dfaa0 LM |
6699 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6700 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6701 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6702 | linux_read_offsets, |
dae5f5cf DJ |
6703 | #else |
6704 | NULL, | |
6705 | #endif | |
6706 | #ifdef USE_THREAD_DB | |
6707 | thread_db_get_tls_address, | |
6708 | #else | |
6709 | NULL, | |
52fb6437 | 6710 | #endif |
efcbbd14 | 6711 | linux_qxfer_spu, |
59a016f0 | 6712 | hostio_last_error_from_errno, |
07e059b5 | 6713 | linux_qxfer_osdata, |
4aa995e1 | 6714 | linux_xfer_siginfo, |
bd99dc85 PA |
6715 | linux_supports_non_stop, |
6716 | linux_async, | |
6717 | linux_start_non_stop, | |
cdbfd419 | 6718 | linux_supports_multi_process, |
89245bc0 DB |
6719 | linux_supports_fork_events, |
6720 | linux_supports_vfork_events, | |
de0d863e | 6721 | linux_handle_new_gdb_connection, |
cdbfd419 | 6722 | #ifdef USE_THREAD_DB |
dc146f7c | 6723 | thread_db_handle_monitor_command, |
cdbfd419 | 6724 | #else |
dc146f7c | 6725 | NULL, |
cdbfd419 | 6726 | #endif |
d26e3629 | 6727 | linux_common_core_of_thread, |
78d85199 | 6728 | linux_read_loadmap, |
219f2f23 PA |
6729 | linux_process_qsupported, |
6730 | linux_supports_tracepoints, | |
6731 | linux_read_pc, | |
8336d594 PA |
6732 | linux_write_pc, |
6733 | linux_thread_stopped, | |
7984d532 | 6734 | NULL, |
711e434b | 6735 | linux_pause_all, |
7984d532 | 6736 | linux_unpause_all, |
fa593d66 | 6737 | linux_stabilize_threads, |
6a271cae | 6738 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6739 | linux_emit_ops, |
6740 | linux_supports_disable_randomization, | |
405f8e94 | 6741 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6742 | linux_qxfer_libraries_svr4, |
d1feda86 | 6743 | linux_supports_agent, |
9accd112 MM |
6744 | #ifdef HAVE_LINUX_BTRACE |
6745 | linux_supports_btrace, | |
6746 | linux_low_enable_btrace, | |
969c39fb | 6747 | linux_low_disable_btrace, |
9accd112 | 6748 | linux_low_read_btrace, |
f4abbc16 | 6749 | linux_low_btrace_conf, |
9accd112 MM |
6750 | #else |
6751 | NULL, | |
6752 | NULL, | |
6753 | NULL, | |
6754 | NULL, | |
f4abbc16 | 6755 | NULL, |
9accd112 | 6756 | #endif |
c2d6af84 | 6757 | linux_supports_range_stepping, |
e57f1de3 | 6758 | linux_proc_pid_to_exec_file, |
14d2069a GB |
6759 | linux_mntns_open_cloexec, |
6760 | linux_mntns_unlink, | |
6761 | linux_mntns_readlink, | |
ce3a066d DJ |
6762 | }; |
6763 | ||
0d62e5e8 DJ |
6764 | static void |
6765 | linux_init_signals () | |
6766 | { | |
6767 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6768 | to find what the cancel signal actually is. */ | |
1a981360 | 6769 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6770 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6771 | #endif |
0d62e5e8 DJ |
6772 | } |
6773 | ||
3aee8918 PA |
6774 | #ifdef HAVE_LINUX_REGSETS |
6775 | void | |
6776 | initialize_regsets_info (struct regsets_info *info) | |
6777 | { | |
6778 | for (info->num_regsets = 0; | |
6779 | info->regsets[info->num_regsets].size >= 0; | |
6780 | info->num_regsets++) | |
6781 | ; | |
3aee8918 PA |
6782 | } |
6783 | #endif | |
6784 | ||
da6d8c04 DJ |
6785 | void |
6786 | initialize_low (void) | |
6787 | { | |
bd99dc85 PA |
6788 | struct sigaction sigchld_action; |
6789 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6790 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6791 | set_breakpoint_data (the_low_target.breakpoint, |
6792 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6793 | linux_init_signals (); |
aa7c7447 | 6794 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6795 | |
6796 | sigchld_action.sa_handler = sigchld_handler; | |
6797 | sigemptyset (&sigchld_action.sa_mask); | |
6798 | sigchld_action.sa_flags = SA_RESTART; | |
6799 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6800 | |
6801 | initialize_low_arch (); | |
89245bc0 DB |
6802 | |
6803 | linux_check_ptrace_features (); | |
da6d8c04 | 6804 | } |