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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); |
00db26fa | 270 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 271 | static void proceed_all_lwps (void); |
d50171e4 | 272 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 PA |
273 | static int kill_lwp (unsigned long lwpid, int signo); |
274 | ||
582511be PA |
275 | /* When the event-loop is doing a step-over, this points at the thread |
276 | being stepped. */ | |
277 | ptid_t step_over_bkpt; | |
278 | ||
d50171e4 PA |
279 | /* True if the low target can hardware single-step. Such targets |
280 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
281 | ||
282 | static int | |
283 | can_hardware_single_step (void) | |
284 | { | |
285 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
286 | } | |
287 | ||
288 | /* True if the low target supports memory breakpoints. If so, we'll | |
289 | have a GET_PC implementation. */ | |
290 | ||
291 | static int | |
292 | supports_breakpoints (void) | |
293 | { | |
294 | return (the_low_target.get_pc != NULL); | |
295 | } | |
0d62e5e8 | 296 | |
fa593d66 PA |
297 | /* Returns true if this target can support fast tracepoints. This |
298 | does not mean that the in-process agent has been loaded in the | |
299 | inferior. */ | |
300 | ||
301 | static int | |
302 | supports_fast_tracepoints (void) | |
303 | { | |
304 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
305 | } | |
306 | ||
c2d6af84 PA |
307 | /* True if LWP is stopped in its stepping range. */ |
308 | ||
309 | static int | |
310 | lwp_in_step_range (struct lwp_info *lwp) | |
311 | { | |
312 | CORE_ADDR pc = lwp->stop_pc; | |
313 | ||
314 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
315 | } | |
316 | ||
0d62e5e8 DJ |
317 | struct pending_signals |
318 | { | |
319 | int signal; | |
32ca6d61 | 320 | siginfo_t info; |
0d62e5e8 DJ |
321 | struct pending_signals *prev; |
322 | }; | |
611cb4a5 | 323 | |
bd99dc85 PA |
324 | /* The read/write ends of the pipe registered as waitable file in the |
325 | event loop. */ | |
326 | static int linux_event_pipe[2] = { -1, -1 }; | |
327 | ||
328 | /* True if we're currently in async mode. */ | |
329 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
330 | ||
02fc4de7 | 331 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 332 | static void wait_for_sigstop (void); |
bd99dc85 | 333 | |
d0722149 DE |
334 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
335 | ||
336 | static int | |
214d508e | 337 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 338 | { |
214d508e L |
339 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
340 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
341 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
342 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
343 | { | |
344 | *machine = header->e_machine; | |
345 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
346 | ||
347 | } | |
348 | *machine = EM_NONE; | |
349 | return -1; | |
d0722149 DE |
350 | } |
351 | ||
352 | /* Return non-zero if FILE is a 64-bit ELF file, | |
353 | zero if the file is not a 64-bit ELF file, | |
354 | and -1 if the file is not accessible or doesn't exist. */ | |
355 | ||
be07f1a2 | 356 | static int |
214d508e | 357 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 358 | { |
957f3f49 | 359 | Elf64_Ehdr header; |
d0722149 DE |
360 | int fd; |
361 | ||
362 | fd = open (file, O_RDONLY); | |
363 | if (fd < 0) | |
364 | return -1; | |
365 | ||
366 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
367 | { | |
368 | close (fd); | |
369 | return 0; | |
370 | } | |
371 | close (fd); | |
372 | ||
214d508e | 373 | return elf_64_header_p (&header, machine); |
d0722149 DE |
374 | } |
375 | ||
be07f1a2 PA |
376 | /* Accepts an integer PID; Returns true if the executable PID is |
377 | running is a 64-bit ELF file.. */ | |
378 | ||
379 | int | |
214d508e | 380 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 381 | { |
d8d2a3ee | 382 | char file[PATH_MAX]; |
be07f1a2 PA |
383 | |
384 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 385 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
386 | } |
387 | ||
bd99dc85 PA |
388 | static void |
389 | delete_lwp (struct lwp_info *lwp) | |
390 | { | |
fa96cb38 PA |
391 | struct thread_info *thr = get_lwp_thread (lwp); |
392 | ||
393 | if (debug_threads) | |
394 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
395 | ||
396 | remove_thread (thr); | |
aa5ca48f | 397 | free (lwp->arch_private); |
bd99dc85 PA |
398 | free (lwp); |
399 | } | |
400 | ||
95954743 PA |
401 | /* Add a process to the common process list, and set its private |
402 | data. */ | |
403 | ||
404 | static struct process_info * | |
405 | linux_add_process (int pid, int attached) | |
406 | { | |
407 | struct process_info *proc; | |
408 | ||
95954743 | 409 | proc = add_process (pid, attached); |
fe978cb0 | 410 | proc->priv = xcalloc (1, sizeof (*proc->priv)); |
95954743 | 411 | |
aa5ca48f | 412 | if (the_low_target.new_process != NULL) |
fe978cb0 | 413 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 414 | |
95954743 PA |
415 | return proc; |
416 | } | |
417 | ||
582511be PA |
418 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
419 | ||
bd99dc85 | 420 | /* Handle a GNU/Linux extended wait response. If we see a clone |
de0d863e DB |
421 | event, we need to add the new LWP to our list (and return 0 so as |
422 | not to report the trap to higher layers). */ | |
0d62e5e8 | 423 | |
de0d863e DB |
424 | static int |
425 | handle_extended_wait (struct lwp_info *event_lwp, int wstat) | |
24a09b5f | 426 | { |
89a5711c | 427 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 428 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 429 | struct lwp_info *new_lwp; |
24a09b5f | 430 | |
c269dbdb DB |
431 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
432 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 433 | { |
95954743 | 434 | ptid_t ptid; |
24a09b5f | 435 | unsigned long new_pid; |
05044653 | 436 | int ret, status; |
24a09b5f | 437 | |
de0d863e | 438 | /* Get the pid of the new lwp. */ |
d86d4aaf | 439 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 440 | &new_pid); |
24a09b5f DJ |
441 | |
442 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 443 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
444 | { |
445 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
446 | hits the SIGSTOP, but we're already attached. */ | |
447 | ||
97438e3f | 448 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
449 | |
450 | if (ret == -1) | |
451 | perror_with_name ("waiting for new child"); | |
452 | else if (ret != new_pid) | |
453 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 454 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
455 | warning ("wait returned unexpected status 0x%x", status); |
456 | } | |
457 | ||
c269dbdb | 458 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
459 | { |
460 | struct process_info *parent_proc; | |
461 | struct process_info *child_proc; | |
462 | struct lwp_info *child_lwp; | |
bfacd19d | 463 | struct thread_info *child_thr; |
de0d863e DB |
464 | struct target_desc *tdesc; |
465 | ||
466 | ptid = ptid_build (new_pid, new_pid, 0); | |
467 | ||
468 | if (debug_threads) | |
469 | { | |
470 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
471 | "new child is %d\n", | |
472 | ptid_get_lwp (ptid_of (event_thr)), | |
473 | ptid_get_pid (ptid)); | |
474 | } | |
475 | ||
476 | /* Add the new process to the tables and clone the breakpoint | |
477 | lists of the parent. We need to do this even if the new process | |
478 | will be detached, since we will need the process object and the | |
479 | breakpoints to remove any breakpoints from memory when we | |
480 | detach, and the client side will access registers. */ | |
481 | child_proc = linux_add_process (new_pid, 0); | |
482 | gdb_assert (child_proc != NULL); | |
483 | child_lwp = add_lwp (ptid); | |
484 | gdb_assert (child_lwp != NULL); | |
485 | child_lwp->stopped = 1; | |
bfacd19d DB |
486 | child_lwp->must_set_ptrace_flags = 1; |
487 | child_lwp->status_pending_p = 0; | |
488 | child_thr = get_lwp_thread (child_lwp); | |
489 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
490 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
491 | ||
de0d863e DB |
492 | parent_proc = get_thread_process (event_thr); |
493 | child_proc->attached = parent_proc->attached; | |
494 | clone_all_breakpoints (&child_proc->breakpoints, | |
495 | &child_proc->raw_breakpoints, | |
496 | parent_proc->breakpoints); | |
497 | ||
498 | tdesc = xmalloc (sizeof (struct target_desc)); | |
499 | copy_target_description (tdesc, parent_proc->tdesc); | |
500 | child_proc->tdesc = tdesc; | |
de0d863e | 501 | |
3a8a0396 DB |
502 | /* Clone arch-specific process data. */ |
503 | if (the_low_target.new_fork != NULL) | |
504 | the_low_target.new_fork (parent_proc, child_proc); | |
505 | ||
de0d863e | 506 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
507 | if (event == PTRACE_EVENT_FORK) |
508 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
509 | else if (event == PTRACE_EVENT_VFORK) | |
510 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
511 | ||
de0d863e | 512 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 513 | |
de0d863e DB |
514 | /* The status_pending field contains bits denoting the |
515 | extended event, so when the pending event is handled, | |
516 | the handler will look at lwp->waitstatus. */ | |
517 | event_lwp->status_pending_p = 1; | |
518 | event_lwp->status_pending = wstat; | |
519 | ||
520 | /* Report the event. */ | |
521 | return 0; | |
522 | } | |
523 | ||
fa96cb38 PA |
524 | if (debug_threads) |
525 | debug_printf ("HEW: Got clone event " | |
526 | "from LWP %ld, new child is LWP %ld\n", | |
527 | lwpid_of (event_thr), new_pid); | |
528 | ||
d86d4aaf | 529 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 530 | new_lwp = add_lwp (ptid); |
24a09b5f | 531 | |
e27d73f6 DE |
532 | /* Either we're going to immediately resume the new thread |
533 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
534 | thinks the thread is currently running, so set this first | |
535 | before calling linux_resume_one_lwp. */ | |
536 | new_lwp->stopped = 1; | |
537 | ||
bde24c0a PA |
538 | /* If we're suspending all threads, leave this one suspended |
539 | too. */ | |
540 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
541 | new_lwp->suspended = 1; | |
542 | ||
da5898ce DJ |
543 | /* Normally we will get the pending SIGSTOP. But in some cases |
544 | we might get another signal delivered to the group first. | |
f21cc1a2 | 545 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 546 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 547 | { |
54a0b537 | 548 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
549 | new_lwp->status_pending_p = 1; |
550 | new_lwp->status_pending = status; | |
da5898ce | 551 | } |
de0d863e DB |
552 | |
553 | /* Don't report the event. */ | |
554 | return 1; | |
24a09b5f | 555 | } |
c269dbdb DB |
556 | else if (event == PTRACE_EVENT_VFORK_DONE) |
557 | { | |
558 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
559 | ||
560 | /* Report the event. */ | |
561 | return 0; | |
562 | } | |
de0d863e DB |
563 | |
564 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
565 | } |
566 | ||
d50171e4 PA |
567 | /* Return the PC as read from the regcache of LWP, without any |
568 | adjustment. */ | |
569 | ||
570 | static CORE_ADDR | |
571 | get_pc (struct lwp_info *lwp) | |
572 | { | |
0bfdf32f | 573 | struct thread_info *saved_thread; |
d50171e4 PA |
574 | struct regcache *regcache; |
575 | CORE_ADDR pc; | |
576 | ||
577 | if (the_low_target.get_pc == NULL) | |
578 | return 0; | |
579 | ||
0bfdf32f GB |
580 | saved_thread = current_thread; |
581 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 582 | |
0bfdf32f | 583 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
584 | pc = (*the_low_target.get_pc) (regcache); |
585 | ||
586 | if (debug_threads) | |
87ce2a04 | 587 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 588 | |
0bfdf32f | 589 | current_thread = saved_thread; |
d50171e4 PA |
590 | return pc; |
591 | } | |
592 | ||
593 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
594 | The SIGTRAP could mean several things. |
595 | ||
596 | On i386, where decr_pc_after_break is non-zero: | |
582511be PA |
597 | |
598 | If we were single-stepping this process using PTRACE_SINGLESTEP, we | |
599 | will get only the one SIGTRAP. The value of $eip will be the next | |
600 | instruction. If the instruction we stepped over was a breakpoint, | |
601 | we need to decrement the PC. | |
602 | ||
0d62e5e8 DJ |
603 | If we continue the process using PTRACE_CONT, we will get a |
604 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
605 | the instruction after the breakpoint (i.e. needs to be | |
606 | decremented). If we report the SIGTRAP to GDB, we must also | |
582511be | 607 | report the undecremented PC. If the breakpoint is removed, we |
0d62e5e8 DJ |
608 | must resume at the decremented PC. |
609 | ||
582511be PA |
610 | On a non-decr_pc_after_break machine with hardware or kernel |
611 | single-step: | |
612 | ||
613 | If we either single-step a breakpoint instruction, or continue and | |
614 | hit a breakpoint instruction, our PC will point at the breakpoint | |
0d62e5e8 DJ |
615 | instruction. */ |
616 | ||
582511be PA |
617 | static int |
618 | check_stopped_by_breakpoint (struct lwp_info *lwp) | |
0d62e5e8 | 619 | { |
582511be PA |
620 | CORE_ADDR pc; |
621 | CORE_ADDR sw_breakpoint_pc; | |
622 | struct thread_info *saved_thread; | |
3e572f71 PA |
623 | #if USE_SIGTRAP_SIGINFO |
624 | siginfo_t siginfo; | |
625 | #endif | |
d50171e4 PA |
626 | |
627 | if (the_low_target.get_pc == NULL) | |
628 | return 0; | |
0d62e5e8 | 629 | |
582511be PA |
630 | pc = get_pc (lwp); |
631 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 632 | |
582511be PA |
633 | /* breakpoint_at reads from the current thread. */ |
634 | saved_thread = current_thread; | |
635 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 636 | |
3e572f71 PA |
637 | #if USE_SIGTRAP_SIGINFO |
638 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
639 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
640 | { | |
641 | if (siginfo.si_signo == SIGTRAP) | |
642 | { | |
643 | if (siginfo.si_code == GDB_ARCH_TRAP_BRKPT) | |
644 | { | |
645 | if (debug_threads) | |
646 | { | |
647 | struct thread_info *thr = get_lwp_thread (lwp); | |
648 | ||
2bf6fb9d | 649 | debug_printf ("CSBB: %s stopped by software breakpoint\n", |
3e572f71 PA |
650 | target_pid_to_str (ptid_of (thr))); |
651 | } | |
652 | ||
653 | /* Back up the PC if necessary. */ | |
654 | if (pc != sw_breakpoint_pc) | |
655 | { | |
656 | struct regcache *regcache | |
657 | = get_thread_regcache (current_thread, 1); | |
658 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
659 | } | |
660 | ||
661 | lwp->stop_pc = sw_breakpoint_pc; | |
662 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
663 | current_thread = saved_thread; | |
664 | return 1; | |
665 | } | |
666 | else if (siginfo.si_code == TRAP_HWBKPT) | |
667 | { | |
668 | if (debug_threads) | |
669 | { | |
670 | struct thread_info *thr = get_lwp_thread (lwp); | |
671 | ||
2bf6fb9d PA |
672 | debug_printf ("CSBB: %s stopped by hardware " |
673 | "breakpoint/watchpoint\n", | |
3e572f71 PA |
674 | target_pid_to_str (ptid_of (thr))); |
675 | } | |
676 | ||
677 | lwp->stop_pc = pc; | |
678 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
679 | current_thread = saved_thread; | |
680 | return 1; | |
681 | } | |
2bf6fb9d PA |
682 | else if (siginfo.si_code == TRAP_TRACE) |
683 | { | |
684 | if (debug_threads) | |
685 | { | |
686 | struct thread_info *thr = get_lwp_thread (lwp); | |
687 | ||
688 | debug_printf ("CSBB: %s stopped by trace\n", | |
689 | target_pid_to_str (ptid_of (thr))); | |
690 | } | |
691 | } | |
3e572f71 PA |
692 | } |
693 | } | |
694 | #else | |
582511be PA |
695 | /* We may have just stepped a breakpoint instruction. E.g., in |
696 | non-stop mode, GDB first tells the thread A to step a range, and | |
697 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
698 | case we need to report the breakpoint PC. */ |
699 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be PA |
700 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
701 | { | |
702 | if (debug_threads) | |
703 | { | |
704 | struct thread_info *thr = get_lwp_thread (lwp); | |
705 | ||
706 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
707 | target_pid_to_str (ptid_of (thr))); | |
708 | } | |
709 | ||
710 | /* Back up the PC if necessary. */ | |
711 | if (pc != sw_breakpoint_pc) | |
712 | { | |
713 | struct regcache *regcache | |
714 | = get_thread_regcache (current_thread, 1); | |
715 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
716 | } | |
717 | ||
718 | lwp->stop_pc = sw_breakpoint_pc; | |
15c66dd6 | 719 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
582511be PA |
720 | current_thread = saved_thread; |
721 | return 1; | |
722 | } | |
723 | ||
724 | if (hardware_breakpoint_inserted_here (pc)) | |
725 | { | |
726 | if (debug_threads) | |
727 | { | |
728 | struct thread_info *thr = get_lwp_thread (lwp); | |
729 | ||
730 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
731 | target_pid_to_str (ptid_of (thr))); | |
732 | } | |
47c0c975 | 733 | |
582511be | 734 | lwp->stop_pc = pc; |
15c66dd6 | 735 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; |
582511be PA |
736 | current_thread = saved_thread; |
737 | return 1; | |
738 | } | |
3e572f71 | 739 | #endif |
582511be PA |
740 | |
741 | current_thread = saved_thread; | |
742 | return 0; | |
0d62e5e8 | 743 | } |
ce3a066d | 744 | |
b3312d80 | 745 | static struct lwp_info * |
95954743 | 746 | add_lwp (ptid_t ptid) |
611cb4a5 | 747 | { |
54a0b537 | 748 | struct lwp_info *lwp; |
0d62e5e8 | 749 | |
00db26fa PA |
750 | lwp = (struct lwp_info *) xcalloc (1, sizeof (*lwp)); |
751 | ||
752 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 753 | |
aa5ca48f | 754 | if (the_low_target.new_thread != NULL) |
34c703da | 755 | the_low_target.new_thread (lwp); |
aa5ca48f | 756 | |
f7667f0d | 757 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 758 | |
54a0b537 | 759 | return lwp; |
0d62e5e8 | 760 | } |
611cb4a5 | 761 | |
da6d8c04 DJ |
762 | /* Start an inferior process and returns its pid. |
763 | ALLARGS is a vector of program-name and args. */ | |
764 | ||
ce3a066d DJ |
765 | static int |
766 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 767 | { |
a6dbe5df | 768 | struct lwp_info *new_lwp; |
da6d8c04 | 769 | int pid; |
95954743 | 770 | ptid_t ptid; |
8cc73a39 SDJ |
771 | struct cleanup *restore_personality |
772 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 773 | |
42c81e2a | 774 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
775 | pid = vfork (); |
776 | #else | |
da6d8c04 | 777 | pid = fork (); |
52fb6437 | 778 | #endif |
da6d8c04 DJ |
779 | if (pid < 0) |
780 | perror_with_name ("fork"); | |
781 | ||
782 | if (pid == 0) | |
783 | { | |
602e3198 | 784 | close_most_fds (); |
b8e1b30e | 785 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 786 | |
1a981360 | 787 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 788 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 789 | #endif |
0d62e5e8 | 790 | |
a9fa9f7d DJ |
791 | setpgid (0, 0); |
792 | ||
e0f9f062 DE |
793 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
794 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
795 | Also, redirect stdin to /dev/null. */ | |
796 | if (remote_connection_is_stdio ()) | |
797 | { | |
798 | close (0); | |
799 | open ("/dev/null", O_RDONLY); | |
800 | dup2 (2, 1); | |
3e52c33d JK |
801 | if (write (2, "stdin/stdout redirected\n", |
802 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
803 | { |
804 | /* Errors ignored. */; | |
805 | } | |
e0f9f062 DE |
806 | } |
807 | ||
2b876972 DJ |
808 | execv (program, allargs); |
809 | if (errno == ENOENT) | |
810 | execvp (program, allargs); | |
da6d8c04 DJ |
811 | |
812 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 813 | strerror (errno)); |
da6d8c04 DJ |
814 | fflush (stderr); |
815 | _exit (0177); | |
816 | } | |
817 | ||
8cc73a39 | 818 | do_cleanups (restore_personality); |
03583c20 | 819 | |
55d7b841 | 820 | linux_add_process (pid, 0); |
95954743 PA |
821 | |
822 | ptid = ptid_build (pid, pid, 0); | |
823 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 824 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 825 | |
a9fa9f7d | 826 | return pid; |
da6d8c04 DJ |
827 | } |
828 | ||
c06cbd92 YQ |
829 | /* Implement the arch_setup target_ops method. */ |
830 | ||
831 | static void | |
832 | linux_arch_setup (void) | |
833 | { | |
834 | the_low_target.arch_setup (); | |
835 | } | |
836 | ||
8784d563 PA |
837 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
838 | error. */ | |
da6d8c04 | 839 | |
7ae1a6a6 PA |
840 | int |
841 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 842 | { |
54a0b537 | 843 | struct lwp_info *new_lwp; |
7ae1a6a6 | 844 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 845 | |
b8e1b30e | 846 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 847 | != 0) |
7ae1a6a6 | 848 | return errno; |
24a09b5f | 849 | |
b3312d80 | 850 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 851 | |
a6dbe5df PA |
852 | /* We need to wait for SIGSTOP before being able to make the next |
853 | ptrace call on this LWP. */ | |
854 | new_lwp->must_set_ptrace_flags = 1; | |
855 | ||
644cebc9 | 856 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
857 | { |
858 | if (debug_threads) | |
87ce2a04 | 859 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
860 | |
861 | /* The process is definitely stopped. It is in a job control | |
862 | stop, unless the kernel predates the TASK_STOPPED / | |
863 | TASK_TRACED distinction, in which case it might be in a | |
864 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
865 | can kill it, signal it, et cetera. | |
866 | ||
867 | First make sure there is a pending SIGSTOP. Since we are | |
868 | already attached, the process can not transition from stopped | |
869 | to running without a PTRACE_CONT; so we know this signal will | |
870 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
871 | probably already in the queue (unless this kernel is old | |
872 | enough to use TASK_STOPPED for ptrace stops); but since | |
873 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
874 | kill_lwp (lwpid, SIGSTOP); | |
875 | ||
876 | /* Finally, resume the stopped process. This will deliver the | |
877 | SIGSTOP (or a higher priority signal, just like normal | |
878 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 879 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
880 | } |
881 | ||
0d62e5e8 | 882 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
883 | brings it to a halt. |
884 | ||
885 | There are several cases to consider here: | |
886 | ||
887 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 888 | of a new thread that is being created. |
d50171e4 PA |
889 | In this case we should ignore that SIGSTOP and resume the |
890 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 891 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 892 | resume_continue. |
0e21c1ec DE |
893 | |
894 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
895 | to it via attach_inferior. |
896 | In this case we want the process thread to stop. | |
d50171e4 PA |
897 | This is handled by having linux_attach set last_resume_kind == |
898 | resume_stop after we return. | |
e3deef73 LM |
899 | |
900 | If the pid we are attaching to is also the tgid, we attach to and | |
901 | stop all the existing threads. Otherwise, we attach to pid and | |
902 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
903 | |
904 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
905 | existing threads. |
906 | In this case we want the thread to stop. | |
907 | FIXME: This case is currently not properly handled. | |
908 | We should wait for the SIGSTOP but don't. Things work apparently | |
909 | because enough time passes between when we ptrace (ATTACH) and when | |
910 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
911 | |
912 | On the other hand, if we are currently trying to stop all threads, we | |
913 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 914 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
915 | end of the list, and so the new thread has not yet reached |
916 | wait_for_sigstop (but will). */ | |
d50171e4 | 917 | new_lwp->stop_expected = 1; |
0d62e5e8 | 918 | |
7ae1a6a6 | 919 | return 0; |
95954743 PA |
920 | } |
921 | ||
8784d563 PA |
922 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
923 | already attached. Returns true if a new LWP is found, false | |
924 | otherwise. */ | |
925 | ||
926 | static int | |
927 | attach_proc_task_lwp_callback (ptid_t ptid) | |
928 | { | |
929 | /* Is this a new thread? */ | |
930 | if (find_thread_ptid (ptid) == NULL) | |
931 | { | |
932 | int lwpid = ptid_get_lwp (ptid); | |
933 | int err; | |
934 | ||
935 | if (debug_threads) | |
936 | debug_printf ("Found new lwp %d\n", lwpid); | |
937 | ||
938 | err = linux_attach_lwp (ptid); | |
939 | ||
940 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
941 | is returned if the thread's task still exists, and is marked | |
942 | as exited or zombie, as well as other conditions, so in that | |
943 | case, confirm the status in /proc/PID/status. */ | |
944 | if (err == ESRCH | |
945 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
946 | { | |
947 | if (debug_threads) | |
948 | { | |
949 | debug_printf ("Cannot attach to lwp %d: " | |
950 | "thread is gone (%d: %s)\n", | |
951 | lwpid, err, strerror (err)); | |
952 | } | |
953 | } | |
954 | else if (err != 0) | |
955 | { | |
956 | warning (_("Cannot attach to lwp %d: %s"), | |
957 | lwpid, | |
958 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
959 | } | |
960 | ||
961 | return 1; | |
962 | } | |
963 | return 0; | |
964 | } | |
965 | ||
e3deef73 LM |
966 | /* Attach to PID. If PID is the tgid, attach to it and all |
967 | of its threads. */ | |
968 | ||
c52daf70 | 969 | static int |
a1928bad | 970 | linux_attach (unsigned long pid) |
0d62e5e8 | 971 | { |
7ae1a6a6 PA |
972 | ptid_t ptid = ptid_build (pid, pid, 0); |
973 | int err; | |
974 | ||
e3deef73 LM |
975 | /* Attach to PID. We will check for other threads |
976 | soon. */ | |
7ae1a6a6 PA |
977 | err = linux_attach_lwp (ptid); |
978 | if (err != 0) | |
979 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 980 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 981 | |
55d7b841 | 982 | linux_add_process (pid, 1); |
0d62e5e8 | 983 | |
bd99dc85 PA |
984 | if (!non_stop) |
985 | { | |
8336d594 PA |
986 | struct thread_info *thread; |
987 | ||
988 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
989 | process. It will be collected by wait shortly. */ | |
990 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
991 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 992 | } |
0d62e5e8 | 993 | |
8784d563 PA |
994 | /* We must attach to every LWP. If /proc is mounted, use that to |
995 | find them now. On the one hand, the inferior may be using raw | |
996 | clone instead of using pthreads. On the other hand, even if it | |
997 | is using pthreads, GDB may not be connected yet (thread_db needs | |
998 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
999 | structures in the inferior's address space to find the list of | |
1000 | threads/LWPs, and those structures may well be corrupted. Note | |
1001 | that once thread_db is loaded, we'll still use it to list threads | |
1002 | and associate pthread info with each LWP. */ | |
1003 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
95954743 PA |
1004 | return 0; |
1005 | } | |
1006 | ||
1007 | struct counter | |
1008 | { | |
1009 | int pid; | |
1010 | int count; | |
1011 | }; | |
1012 | ||
1013 | static int | |
1014 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
1015 | { | |
1016 | struct counter *counter = args; | |
1017 | ||
1018 | if (ptid_get_pid (entry->id) == counter->pid) | |
1019 | { | |
1020 | if (++counter->count > 1) | |
1021 | return 1; | |
1022 | } | |
d61ddec4 | 1023 | |
da6d8c04 DJ |
1024 | return 0; |
1025 | } | |
1026 | ||
95954743 | 1027 | static int |
fa96cb38 | 1028 | last_thread_of_process_p (int pid) |
95954743 | 1029 | { |
95954743 | 1030 | struct counter counter = { pid , 0 }; |
da6d8c04 | 1031 | |
95954743 PA |
1032 | return (find_inferior (&all_threads, |
1033 | second_thread_of_pid_p, &counter) == NULL); | |
1034 | } | |
1035 | ||
da84f473 PA |
1036 | /* Kill LWP. */ |
1037 | ||
1038 | static void | |
1039 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1040 | { | |
d86d4aaf DE |
1041 | struct thread_info *thr = get_lwp_thread (lwp); |
1042 | int pid = lwpid_of (thr); | |
da84f473 PA |
1043 | |
1044 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1045 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1046 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1047 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1048 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1049 | per process, not one for each thread. But since we still support | |
1050 | linuxthreads, and we also support debugging programs using raw | |
1051 | clone without CLONE_THREAD, we send one for each thread. For | |
1052 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
1053 | about some old kernels where PTRACE_KILL might work better | |
1054 | (dubious if there are any such, but that's why it's paranoia), so | |
1055 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
1056 | everywhere. */ | |
1057 | ||
1058 | errno = 0; | |
69ff6be5 | 1059 | kill_lwp (pid, SIGKILL); |
da84f473 | 1060 | if (debug_threads) |
ce9e3fe7 PA |
1061 | { |
1062 | int save_errno = errno; | |
1063 | ||
1064 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1065 | target_pid_to_str (ptid_of (thr)), | |
1066 | save_errno ? strerror (save_errno) : "OK"); | |
1067 | } | |
da84f473 PA |
1068 | |
1069 | errno = 0; | |
b8e1b30e | 1070 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1071 | if (debug_threads) |
ce9e3fe7 PA |
1072 | { |
1073 | int save_errno = errno; | |
1074 | ||
1075 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1076 | target_pid_to_str (ptid_of (thr)), | |
1077 | save_errno ? strerror (save_errno) : "OK"); | |
1078 | } | |
da84f473 PA |
1079 | } |
1080 | ||
e76126e8 PA |
1081 | /* Kill LWP and wait for it to die. */ |
1082 | ||
1083 | static void | |
1084 | kill_wait_lwp (struct lwp_info *lwp) | |
1085 | { | |
1086 | struct thread_info *thr = get_lwp_thread (lwp); | |
1087 | int pid = ptid_get_pid (ptid_of (thr)); | |
1088 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
1089 | int wstat; | |
1090 | int res; | |
1091 | ||
1092 | if (debug_threads) | |
1093 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1094 | ||
1095 | do | |
1096 | { | |
1097 | linux_kill_one_lwp (lwp); | |
1098 | ||
1099 | /* Make sure it died. Notes: | |
1100 | ||
1101 | - The loop is most likely unnecessary. | |
1102 | ||
1103 | - We don't use linux_wait_for_event as that could delete lwps | |
1104 | while we're iterating over them. We're not interested in | |
1105 | any pending status at this point, only in making sure all | |
1106 | wait status on the kernel side are collected until the | |
1107 | process is reaped. | |
1108 | ||
1109 | - We don't use __WALL here as the __WALL emulation relies on | |
1110 | SIGCHLD, and killing a stopped process doesn't generate | |
1111 | one, nor an exit status. | |
1112 | */ | |
1113 | res = my_waitpid (lwpid, &wstat, 0); | |
1114 | if (res == -1 && errno == ECHILD) | |
1115 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1116 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1117 | ||
586b02a9 PA |
1118 | /* Even if it was stopped, the child may have already disappeared. |
1119 | E.g., if it was killed by SIGKILL. */ | |
1120 | if (res < 0 && errno != ECHILD) | |
1121 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1122 | } |
1123 | ||
da84f473 PA |
1124 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
1125 | except the leader. */ | |
95954743 PA |
1126 | |
1127 | static int | |
da84f473 | 1128 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 1129 | { |
0d62e5e8 | 1130 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1131 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1132 | int pid = * (int *) args; |
1133 | ||
1134 | if (ptid_get_pid (entry->id) != pid) | |
1135 | return 0; | |
0d62e5e8 | 1136 | |
fd500816 DJ |
1137 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1138 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1139 | the children get a chance to be reaped, it will remain a zombie | |
1140 | forever. */ | |
95954743 | 1141 | |
d86d4aaf | 1142 | if (lwpid_of (thread) == pid) |
95954743 PA |
1143 | { |
1144 | if (debug_threads) | |
87ce2a04 DE |
1145 | debug_printf ("lkop: is last of process %s\n", |
1146 | target_pid_to_str (entry->id)); | |
95954743 PA |
1147 | return 0; |
1148 | } | |
fd500816 | 1149 | |
e76126e8 | 1150 | kill_wait_lwp (lwp); |
95954743 | 1151 | return 0; |
da6d8c04 DJ |
1152 | } |
1153 | ||
95954743 PA |
1154 | static int |
1155 | linux_kill (int pid) | |
0d62e5e8 | 1156 | { |
95954743 | 1157 | struct process_info *process; |
54a0b537 | 1158 | struct lwp_info *lwp; |
fd500816 | 1159 | |
95954743 PA |
1160 | process = find_process_pid (pid); |
1161 | if (process == NULL) | |
1162 | return -1; | |
9d606399 | 1163 | |
f9e39928 PA |
1164 | /* If we're killing a running inferior, make sure it is stopped |
1165 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1166 | stop_all_lwps (0, NULL); |
f9e39928 | 1167 | |
da84f473 | 1168 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1169 | |
54a0b537 | 1170 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1171 | thread in the list, so do so now. */ |
95954743 | 1172 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1173 | |
784867a5 | 1174 | if (lwp == NULL) |
fd500816 | 1175 | { |
784867a5 | 1176 | if (debug_threads) |
d86d4aaf DE |
1177 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1178 | pid); | |
784867a5 JK |
1179 | } |
1180 | else | |
e76126e8 | 1181 | kill_wait_lwp (lwp); |
2d717e4f | 1182 | |
8336d594 | 1183 | the_target->mourn (process); |
f9e39928 PA |
1184 | |
1185 | /* Since we presently can only stop all lwps of all processes, we | |
1186 | need to unstop lwps of other processes. */ | |
7984d532 | 1187 | unstop_all_lwps (0, NULL); |
95954743 | 1188 | return 0; |
0d62e5e8 DJ |
1189 | } |
1190 | ||
9b224c5e PA |
1191 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1192 | signal the thread last stopped for, which we need to deliver to the | |
1193 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1194 | ||
1195 | static int | |
1196 | get_detach_signal (struct thread_info *thread) | |
1197 | { | |
a493e3e2 | 1198 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1199 | int status; |
1200 | struct lwp_info *lp = get_thread_lwp (thread); | |
1201 | ||
1202 | if (lp->status_pending_p) | |
1203 | status = lp->status_pending; | |
1204 | else | |
1205 | { | |
1206 | /* If the thread had been suspended by gdbserver, and it stopped | |
1207 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1208 | want to deliver that SIGSTOP. */ | |
1209 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1210 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1211 | return 0; |
1212 | ||
1213 | /* Otherwise, we may need to deliver the signal we | |
1214 | intercepted. */ | |
1215 | status = lp->last_status; | |
1216 | } | |
1217 | ||
1218 | if (!WIFSTOPPED (status)) | |
1219 | { | |
1220 | if (debug_threads) | |
87ce2a04 | 1221 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1222 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1223 | return 0; |
1224 | } | |
1225 | ||
1226 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1227 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1228 | { |
1229 | if (debug_threads) | |
87ce2a04 DE |
1230 | debug_printf ("GPS: lwp %s had stopped with extended " |
1231 | "status: no pending signal\n", | |
d86d4aaf | 1232 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1233 | return 0; |
1234 | } | |
1235 | ||
2ea28649 | 1236 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1237 | |
1238 | if (program_signals_p && !program_signals[signo]) | |
1239 | { | |
1240 | if (debug_threads) | |
87ce2a04 | 1241 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1242 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1243 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1244 | return 0; |
1245 | } | |
1246 | else if (!program_signals_p | |
1247 | /* If we have no way to know which signals GDB does not | |
1248 | want to have passed to the program, assume | |
1249 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1250 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1251 | { |
1252 | if (debug_threads) | |
87ce2a04 DE |
1253 | debug_printf ("GPS: lwp %s had signal %s, " |
1254 | "but we don't know if we should pass it. " | |
1255 | "Default to not.\n", | |
d86d4aaf | 1256 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1257 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1258 | return 0; |
1259 | } | |
1260 | else | |
1261 | { | |
1262 | if (debug_threads) | |
87ce2a04 | 1263 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1264 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1265 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1266 | |
1267 | return WSTOPSIG (status); | |
1268 | } | |
1269 | } | |
1270 | ||
95954743 PA |
1271 | static int |
1272 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1273 | { |
1274 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1275 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1276 | int pid = * (int *) args; |
9b224c5e | 1277 | int sig; |
95954743 PA |
1278 | |
1279 | if (ptid_get_pid (entry->id) != pid) | |
1280 | return 0; | |
6ad8ae5c | 1281 | |
9b224c5e | 1282 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1283 | if (lwp->stop_expected) |
ae13219e | 1284 | { |
9b224c5e | 1285 | if (debug_threads) |
87ce2a04 | 1286 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1287 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1288 | |
d86d4aaf | 1289 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1290 | lwp->stop_expected = 0; |
ae13219e DJ |
1291 | } |
1292 | ||
1293 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1294 | regcache_invalidate_thread (thread); |
ae13219e | 1295 | |
9b224c5e PA |
1296 | /* Pass on any pending signal for this thread. */ |
1297 | sig = get_detach_signal (thread); | |
1298 | ||
ae13219e | 1299 | /* Finally, let it resume. */ |
82bfbe7e PA |
1300 | if (the_low_target.prepare_to_resume != NULL) |
1301 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1302 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1303 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1304 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1305 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1306 | strerror (errno)); |
bd99dc85 PA |
1307 | |
1308 | delete_lwp (lwp); | |
95954743 | 1309 | return 0; |
6ad8ae5c DJ |
1310 | } |
1311 | ||
95954743 PA |
1312 | static int |
1313 | linux_detach (int pid) | |
1314 | { | |
1315 | struct process_info *process; | |
1316 | ||
1317 | process = find_process_pid (pid); | |
1318 | if (process == NULL) | |
1319 | return -1; | |
1320 | ||
f9e39928 PA |
1321 | /* Stop all threads before detaching. First, ptrace requires that |
1322 | the thread is stopped to sucessfully detach. Second, thread_db | |
1323 | may need to uninstall thread event breakpoints from memory, which | |
1324 | only works with a stopped process anyway. */ | |
7984d532 | 1325 | stop_all_lwps (0, NULL); |
f9e39928 | 1326 | |
ca5c370d | 1327 | #ifdef USE_THREAD_DB |
8336d594 | 1328 | thread_db_detach (process); |
ca5c370d PA |
1329 | #endif |
1330 | ||
fa593d66 PA |
1331 | /* Stabilize threads (move out of jump pads). */ |
1332 | stabilize_threads (); | |
1333 | ||
95954743 | 1334 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1335 | |
1336 | the_target->mourn (process); | |
f9e39928 PA |
1337 | |
1338 | /* Since we presently can only stop all lwps of all processes, we | |
1339 | need to unstop lwps of other processes. */ | |
7984d532 | 1340 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1341 | return 0; |
1342 | } | |
1343 | ||
1344 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1345 | ||
1346 | static int | |
1347 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1348 | { | |
d86d4aaf DE |
1349 | struct thread_info *thread = (struct thread_info *) entry; |
1350 | struct lwp_info *lwp = get_thread_lwp (thread); | |
f9e39928 PA |
1351 | struct process_info *process = proc; |
1352 | ||
d86d4aaf | 1353 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1354 | delete_lwp (lwp); |
1355 | ||
dd6953e1 | 1356 | return 0; |
6ad8ae5c DJ |
1357 | } |
1358 | ||
8336d594 PA |
1359 | static void |
1360 | linux_mourn (struct process_info *process) | |
1361 | { | |
1362 | struct process_info_private *priv; | |
1363 | ||
1364 | #ifdef USE_THREAD_DB | |
1365 | thread_db_mourn (process); | |
1366 | #endif | |
1367 | ||
d86d4aaf | 1368 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1369 | |
8336d594 | 1370 | /* Freeing all private data. */ |
fe978cb0 | 1371 | priv = process->priv; |
8336d594 PA |
1372 | free (priv->arch_private); |
1373 | free (priv); | |
fe978cb0 | 1374 | process->priv = NULL; |
505106cd PA |
1375 | |
1376 | remove_process (process); | |
8336d594 PA |
1377 | } |
1378 | ||
444d6139 | 1379 | static void |
95954743 | 1380 | linux_join (int pid) |
444d6139 | 1381 | { |
444d6139 PA |
1382 | int status, ret; |
1383 | ||
1384 | do { | |
95954743 | 1385 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1386 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1387 | break; | |
1388 | } while (ret != -1 || errno != ECHILD); | |
1389 | } | |
1390 | ||
6ad8ae5c | 1391 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1392 | static int |
95954743 | 1393 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1394 | { |
95954743 PA |
1395 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1396 | ||
1397 | /* We assume we always know if a thread exits. If a whole process | |
1398 | exited but we still haven't been able to report it to GDB, we'll | |
1399 | hold on to the last lwp of the dead process. */ | |
1400 | if (lwp != NULL) | |
00db26fa | 1401 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1402 | else |
1403 | return 0; | |
1404 | } | |
1405 | ||
582511be PA |
1406 | /* Return 1 if this lwp still has an interesting status pending. If |
1407 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1408 | false. */ | |
1409 | ||
1410 | static int | |
1411 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1412 | { | |
1413 | struct lwp_info *lp = get_thread_lwp (thread); | |
1414 | ||
1415 | if (!lp->status_pending_p) | |
1416 | return 0; | |
1417 | ||
1418 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1419 | report any status pending the LWP may have. */ | |
1420 | if (thread->last_resume_kind == resume_stop | |
1421 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
1422 | return 0; | |
1423 | ||
1424 | if (thread->last_resume_kind != resume_stop | |
15c66dd6 PA |
1425 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1426 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1427 | { |
1428 | struct thread_info *saved_thread; | |
1429 | CORE_ADDR pc; | |
1430 | int discard = 0; | |
1431 | ||
1432 | gdb_assert (lp->last_status != 0); | |
1433 | ||
1434 | pc = get_pc (lp); | |
1435 | ||
1436 | saved_thread = current_thread; | |
1437 | current_thread = thread; | |
1438 | ||
1439 | if (pc != lp->stop_pc) | |
1440 | { | |
1441 | if (debug_threads) | |
1442 | debug_printf ("PC of %ld changed\n", | |
1443 | lwpid_of (thread)); | |
1444 | discard = 1; | |
1445 | } | |
3e572f71 PA |
1446 | |
1447 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1448 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1449 | && !(*the_low_target.breakpoint_at) (pc)) |
1450 | { | |
1451 | if (debug_threads) | |
1452 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1453 | lwpid_of (thread)); | |
1454 | discard = 1; | |
1455 | } | |
15c66dd6 | 1456 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1457 | && !hardware_breakpoint_inserted_here (pc)) |
1458 | { | |
1459 | if (debug_threads) | |
1460 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1461 | lwpid_of (thread)); | |
1462 | discard = 1; | |
1463 | } | |
3e572f71 | 1464 | #endif |
582511be PA |
1465 | |
1466 | current_thread = saved_thread; | |
1467 | ||
1468 | if (discard) | |
1469 | { | |
1470 | if (debug_threads) | |
1471 | debug_printf ("discarding pending breakpoint status\n"); | |
1472 | lp->status_pending_p = 0; | |
1473 | return 0; | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | return 1; | |
1478 | } | |
1479 | ||
6bf5e0ba | 1480 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1481 | static int |
d50171e4 | 1482 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1483 | { |
d86d4aaf | 1484 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1485 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1486 | ptid_t ptid = * (ptid_t *) arg; |
1487 | ||
1488 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1489 | or a specific LWP. */ |
1490 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1491 | return 0; |
0d62e5e8 | 1492 | |
582511be PA |
1493 | if (lp->status_pending_p |
1494 | && !thread_still_has_status_pending_p (thread)) | |
1495 | { | |
1496 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1497 | return 0; | |
1498 | } | |
0d62e5e8 | 1499 | |
582511be | 1500 | return lp->status_pending_p; |
0d62e5e8 DJ |
1501 | } |
1502 | ||
95954743 PA |
1503 | static int |
1504 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1505 | { | |
1506 | ptid_t ptid = *(ptid_t *) data; | |
1507 | int lwp; | |
1508 | ||
1509 | if (ptid_get_lwp (ptid) != 0) | |
1510 | lwp = ptid_get_lwp (ptid); | |
1511 | else | |
1512 | lwp = ptid_get_pid (ptid); | |
1513 | ||
1514 | if (ptid_get_lwp (entry->id) == lwp) | |
1515 | return 1; | |
1516 | ||
1517 | return 0; | |
1518 | } | |
1519 | ||
1520 | struct lwp_info * | |
1521 | find_lwp_pid (ptid_t ptid) | |
1522 | { | |
d86d4aaf DE |
1523 | struct inferior_list_entry *thread |
1524 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1525 | ||
1526 | if (thread == NULL) | |
1527 | return NULL; | |
1528 | ||
1529 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1530 | } |
1531 | ||
fa96cb38 | 1532 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1533 | |
fa96cb38 PA |
1534 | static int |
1535 | num_lwps (int pid) | |
1536 | { | |
1537 | struct inferior_list_entry *inf, *tmp; | |
1538 | int count = 0; | |
0d62e5e8 | 1539 | |
fa96cb38 | 1540 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1541 | { |
fa96cb38 PA |
1542 | if (ptid_get_pid (inf->id) == pid) |
1543 | count++; | |
24a09b5f | 1544 | } |
3aee8918 | 1545 | |
fa96cb38 PA |
1546 | return count; |
1547 | } | |
d61ddec4 | 1548 | |
6d4ee8c6 GB |
1549 | /* The arguments passed to iterate_over_lwps. */ |
1550 | ||
1551 | struct iterate_over_lwps_args | |
1552 | { | |
1553 | /* The FILTER argument passed to iterate_over_lwps. */ | |
1554 | ptid_t filter; | |
1555 | ||
1556 | /* The CALLBACK argument passed to iterate_over_lwps. */ | |
1557 | iterate_over_lwps_ftype *callback; | |
1558 | ||
1559 | /* The DATA argument passed to iterate_over_lwps. */ | |
1560 | void *data; | |
1561 | }; | |
1562 | ||
1563 | /* Callback for find_inferior used by iterate_over_lwps to filter | |
1564 | calls to the callback supplied to that function. Returning a | |
1565 | nonzero value causes find_inferiors to stop iterating and return | |
1566 | the current inferior_list_entry. Returning zero indicates that | |
1567 | find_inferiors should continue iterating. */ | |
1568 | ||
1569 | static int | |
1570 | iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p) | |
1571 | { | |
1572 | struct iterate_over_lwps_args *args | |
1573 | = (struct iterate_over_lwps_args *) args_p; | |
1574 | ||
1575 | if (ptid_match (entry->id, args->filter)) | |
1576 | { | |
1577 | struct thread_info *thr = (struct thread_info *) entry; | |
1578 | struct lwp_info *lwp = get_thread_lwp (thr); | |
1579 | ||
1580 | return (*args->callback) (lwp, args->data); | |
1581 | } | |
1582 | ||
1583 | return 0; | |
1584 | } | |
1585 | ||
1586 | /* See nat/linux-nat.h. */ | |
1587 | ||
1588 | struct lwp_info * | |
1589 | iterate_over_lwps (ptid_t filter, | |
1590 | iterate_over_lwps_ftype callback, | |
1591 | void *data) | |
1592 | { | |
1593 | struct iterate_over_lwps_args args = {filter, callback, data}; | |
1594 | struct inferior_list_entry *entry; | |
1595 | ||
1596 | entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args); | |
1597 | if (entry == NULL) | |
1598 | return NULL; | |
1599 | ||
1600 | return get_thread_lwp ((struct thread_info *) entry); | |
1601 | } | |
1602 | ||
fa96cb38 PA |
1603 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1604 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1605 | |
fa96cb38 PA |
1606 | static void |
1607 | check_zombie_leaders (void) | |
1608 | { | |
1609 | struct process_info *proc, *tmp; | |
c3adc08c | 1610 | |
fa96cb38 | 1611 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1612 | { |
fa96cb38 PA |
1613 | pid_t leader_pid = pid_of (proc); |
1614 | struct lwp_info *leader_lp; | |
c3adc08c | 1615 | |
fa96cb38 | 1616 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1617 | |
fa96cb38 PA |
1618 | if (debug_threads) |
1619 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1620 | "num_lwps=%d, zombie=%d\n", | |
1621 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1622 | linux_proc_pid_is_zombie (leader_pid)); | |
1623 | ||
1624 | if (leader_lp != NULL | |
1625 | /* Check if there are other threads in the group, as we may | |
1626 | have raced with the inferior simply exiting. */ | |
1627 | && !last_thread_of_process_p (leader_pid) | |
1628 | && linux_proc_pid_is_zombie (leader_pid)) | |
1629 | { | |
1630 | /* A leader zombie can mean one of two things: | |
1631 | ||
1632 | - It exited, and there's an exit status pending | |
1633 | available, or only the leader exited (not the whole | |
1634 | program). In the latter case, we can't waitpid the | |
1635 | leader's exit status until all other threads are gone. | |
1636 | ||
1637 | - There are 3 or more threads in the group, and a thread | |
1638 | other than the leader exec'd. On an exec, the Linux | |
1639 | kernel destroys all other threads (except the execing | |
1640 | one) in the thread group, and resets the execing thread's | |
1641 | tid to the tgid. No exit notification is sent for the | |
1642 | execing thread -- from the ptracer's perspective, it | |
1643 | appears as though the execing thread just vanishes. | |
1644 | Until we reap all other threads except the leader and the | |
1645 | execing thread, the leader will be zombie, and the | |
1646 | execing thread will be in `D (disc sleep)'. As soon as | |
1647 | all other threads are reaped, the execing thread changes | |
1648 | it's tid to the tgid, and the previous (zombie) leader | |
1649 | vanishes, giving place to the "new" leader. We could try | |
1650 | distinguishing the exit and exec cases, by waiting once | |
1651 | more, and seeing if something comes out, but it doesn't | |
1652 | sound useful. The previous leader _does_ go away, and | |
1653 | we'll re-add the new one once we see the exec event | |
1654 | (which is just the same as what would happen if the | |
1655 | previous leader did exit voluntarily before some other | |
1656 | thread execs). */ | |
c3adc08c | 1657 | |
fa96cb38 PA |
1658 | if (debug_threads) |
1659 | fprintf (stderr, | |
1660 | "CZL: Thread group leader %d zombie " | |
1661 | "(it exited, or another thread execd).\n", | |
1662 | leader_pid); | |
c3adc08c | 1663 | |
fa96cb38 | 1664 | delete_lwp (leader_lp); |
c3adc08c PA |
1665 | } |
1666 | } | |
fa96cb38 | 1667 | } |
c3adc08c | 1668 | |
fa96cb38 PA |
1669 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1670 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1671 | |
fa96cb38 PA |
1672 | static int |
1673 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1674 | { | |
1675 | struct thread_info *thr = (struct thread_info *) entry; | |
1676 | struct lwp_info *lwp; | |
1677 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1678 | |
fa96cb38 PA |
1679 | if (!ptid_match (ptid_of (thr), filter)) |
1680 | return 0; | |
bd99dc85 | 1681 | |
fa96cb38 PA |
1682 | lwp = get_thread_lwp (thr); |
1683 | if (!lwp->stopped) | |
1684 | return 1; | |
1685 | ||
1686 | return 0; | |
0d62e5e8 | 1687 | } |
611cb4a5 | 1688 | |
219f2f23 PA |
1689 | /* This function should only be called if the LWP got a SIGTRAP. |
1690 | ||
1691 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1692 | event was handled, 0 otherwise. */ | |
1693 | ||
1694 | static int | |
1695 | handle_tracepoints (struct lwp_info *lwp) | |
1696 | { | |
1697 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1698 | int tpoint_related_event = 0; | |
1699 | ||
582511be PA |
1700 | gdb_assert (lwp->suspended == 0); |
1701 | ||
7984d532 PA |
1702 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1703 | uninsert tracepoints. To do this, we temporarily pause all | |
1704 | threads, unpatch away, and then unpause threads. We need to make | |
1705 | sure the unpausing doesn't resume LWP too. */ | |
1706 | lwp->suspended++; | |
1707 | ||
219f2f23 PA |
1708 | /* And we need to be sure that any all-threads-stopping doesn't try |
1709 | to move threads out of the jump pads, as it could deadlock the | |
1710 | inferior (LWP could be in the jump pad, maybe even holding the | |
1711 | lock.) */ | |
1712 | ||
1713 | /* Do any necessary step collect actions. */ | |
1714 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1715 | ||
fa593d66 PA |
1716 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1717 | ||
219f2f23 PA |
1718 | /* See if we just hit a tracepoint and do its main collect |
1719 | actions. */ | |
1720 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1721 | ||
7984d532 PA |
1722 | lwp->suspended--; |
1723 | ||
1724 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1725 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1726 | |
219f2f23 PA |
1727 | if (tpoint_related_event) |
1728 | { | |
1729 | if (debug_threads) | |
87ce2a04 | 1730 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1731 | return 1; |
1732 | } | |
1733 | ||
1734 | return 0; | |
1735 | } | |
1736 | ||
fa593d66 PA |
1737 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1738 | fast tracepoint. */ | |
1739 | ||
1740 | static int | |
1741 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1742 | struct fast_tpoint_collect_status *status) | |
1743 | { | |
1744 | CORE_ADDR thread_area; | |
d86d4aaf | 1745 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1746 | |
1747 | if (the_low_target.get_thread_area == NULL) | |
1748 | return 0; | |
1749 | ||
1750 | /* Get the thread area address. This is used to recognize which | |
1751 | thread is which when tracing with the in-process agent library. | |
1752 | We don't read anything from the address, and treat it as opaque; | |
1753 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1754 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1755 | return 0; |
1756 | ||
1757 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1758 | } | |
1759 | ||
1760 | /* The reason we resume in the caller, is because we want to be able | |
1761 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1762 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1763 | refuses to resume. */ | |
1764 | ||
1765 | static int | |
1766 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1767 | { | |
0bfdf32f | 1768 | struct thread_info *saved_thread; |
fa593d66 | 1769 | |
0bfdf32f GB |
1770 | saved_thread = current_thread; |
1771 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1772 | |
1773 | if ((wstat == NULL | |
1774 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1775 | && supports_fast_tracepoints () | |
58b4daa5 | 1776 | && agent_loaded_p ()) |
fa593d66 PA |
1777 | { |
1778 | struct fast_tpoint_collect_status status; | |
1779 | int r; | |
1780 | ||
1781 | if (debug_threads) | |
87ce2a04 DE |
1782 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1783 | "jump pad.\n", | |
0bfdf32f | 1784 | lwpid_of (current_thread)); |
fa593d66 PA |
1785 | |
1786 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1787 | ||
1788 | if (wstat == NULL | |
1789 | || (WSTOPSIG (*wstat) != SIGILL | |
1790 | && WSTOPSIG (*wstat) != SIGFPE | |
1791 | && WSTOPSIG (*wstat) != SIGSEGV | |
1792 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1793 | { | |
1794 | lwp->collecting_fast_tracepoint = r; | |
1795 | ||
1796 | if (r != 0) | |
1797 | { | |
1798 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1799 | { | |
1800 | /* Haven't executed the original instruction yet. | |
1801 | Set breakpoint there, and wait till it's hit, | |
1802 | then single-step until exiting the jump pad. */ | |
1803 | lwp->exit_jump_pad_bkpt | |
1804 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1805 | } | |
1806 | ||
1807 | if (debug_threads) | |
87ce2a04 DE |
1808 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1809 | "the jump pad...it does\n", | |
0bfdf32f GB |
1810 | lwpid_of (current_thread)); |
1811 | current_thread = saved_thread; | |
fa593d66 PA |
1812 | |
1813 | return 1; | |
1814 | } | |
1815 | } | |
1816 | else | |
1817 | { | |
1818 | /* If we get a synchronous signal while collecting, *and* | |
1819 | while executing the (relocated) original instruction, | |
1820 | reset the PC to point at the tpoint address, before | |
1821 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1822 | report the signal to GDB, and pray for the best. */ | |
1823 | ||
1824 | lwp->collecting_fast_tracepoint = 0; | |
1825 | ||
1826 | if (r != 0 | |
1827 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1828 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1829 | { | |
1830 | siginfo_t info; | |
1831 | struct regcache *regcache; | |
1832 | ||
1833 | /* The si_addr on a few signals references the address | |
1834 | of the faulting instruction. Adjust that as | |
1835 | well. */ | |
1836 | if ((WSTOPSIG (*wstat) == SIGILL | |
1837 | || WSTOPSIG (*wstat) == SIGFPE | |
1838 | || WSTOPSIG (*wstat) == SIGBUS | |
1839 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 1840 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1841 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1842 | /* Final check just to make sure we don't clobber |
1843 | the siginfo of non-kernel-sent signals. */ | |
1844 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1845 | { | |
1846 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 1847 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1848 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1849 | } |
1850 | ||
0bfdf32f | 1851 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
1852 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1853 | lwp->stop_pc = status.tpoint_addr; | |
1854 | ||
1855 | /* Cancel any fast tracepoint lock this thread was | |
1856 | holding. */ | |
1857 | force_unlock_trace_buffer (); | |
1858 | } | |
1859 | ||
1860 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1861 | { | |
1862 | if (debug_threads) | |
87ce2a04 DE |
1863 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1864 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1865 | |
1866 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
1867 | |
1868 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1869 | lwp->exit_jump_pad_bkpt = NULL; | |
1870 | ||
1871 | unstop_all_lwps (1, lwp); | |
1872 | ||
1873 | gdb_assert (lwp->suspended >= 0); | |
1874 | } | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | if (debug_threads) | |
87ce2a04 DE |
1879 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1880 | "jump pad...no\n", | |
0bfdf32f | 1881 | lwpid_of (current_thread)); |
0cccb683 | 1882 | |
0bfdf32f | 1883 | current_thread = saved_thread; |
fa593d66 PA |
1884 | return 0; |
1885 | } | |
1886 | ||
1887 | /* Enqueue one signal in the "signals to report later when out of the | |
1888 | jump pad" list. */ | |
1889 | ||
1890 | static void | |
1891 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1892 | { | |
1893 | struct pending_signals *p_sig; | |
d86d4aaf | 1894 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1895 | |
1896 | if (debug_threads) | |
87ce2a04 | 1897 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 1898 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1899 | |
1900 | if (debug_threads) | |
1901 | { | |
1902 | struct pending_signals *sig; | |
1903 | ||
1904 | for (sig = lwp->pending_signals_to_report; | |
1905 | sig != NULL; | |
1906 | sig = sig->prev) | |
87ce2a04 DE |
1907 | debug_printf (" Already queued %d\n", |
1908 | sig->signal); | |
fa593d66 | 1909 | |
87ce2a04 | 1910 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1911 | } |
1912 | ||
1a981360 PA |
1913 | /* Don't enqueue non-RT signals if they are already in the deferred |
1914 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1915 | twice) */ | |
1916 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1917 | { | |
1918 | struct pending_signals *sig; | |
1919 | ||
1920 | for (sig = lwp->pending_signals_to_report; | |
1921 | sig != NULL; | |
1922 | sig = sig->prev) | |
1923 | { | |
1924 | if (sig->signal == WSTOPSIG (*wstat)) | |
1925 | { | |
1926 | if (debug_threads) | |
87ce2a04 DE |
1927 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1928 | " for LWP %ld\n", | |
1929 | sig->signal, | |
d86d4aaf | 1930 | lwpid_of (thread)); |
1a981360 PA |
1931 | return; |
1932 | } | |
1933 | } | |
1934 | } | |
1935 | ||
fa593d66 PA |
1936 | p_sig = xmalloc (sizeof (*p_sig)); |
1937 | p_sig->prev = lwp->pending_signals_to_report; | |
1938 | p_sig->signal = WSTOPSIG (*wstat); | |
1939 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
d86d4aaf | 1940 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1941 | &p_sig->info); |
fa593d66 PA |
1942 | |
1943 | lwp->pending_signals_to_report = p_sig; | |
1944 | } | |
1945 | ||
1946 | /* Dequeue one signal from the "signals to report later when out of | |
1947 | the jump pad" list. */ | |
1948 | ||
1949 | static int | |
1950 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1951 | { | |
d86d4aaf DE |
1952 | struct thread_info *thread = get_lwp_thread (lwp); |
1953 | ||
fa593d66 PA |
1954 | if (lwp->pending_signals_to_report != NULL) |
1955 | { | |
1956 | struct pending_signals **p_sig; | |
1957 | ||
1958 | p_sig = &lwp->pending_signals_to_report; | |
1959 | while ((*p_sig)->prev != NULL) | |
1960 | p_sig = &(*p_sig)->prev; | |
1961 | ||
1962 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1963 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 1964 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1965 | &(*p_sig)->info); |
fa593d66 PA |
1966 | free (*p_sig); |
1967 | *p_sig = NULL; | |
1968 | ||
1969 | if (debug_threads) | |
87ce2a04 | 1970 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 1971 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1972 | |
1973 | if (debug_threads) | |
1974 | { | |
1975 | struct pending_signals *sig; | |
1976 | ||
1977 | for (sig = lwp->pending_signals_to_report; | |
1978 | sig != NULL; | |
1979 | sig = sig->prev) | |
87ce2a04 DE |
1980 | debug_printf (" Still queued %d\n", |
1981 | sig->signal); | |
fa593d66 | 1982 | |
87ce2a04 | 1983 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
1984 | } |
1985 | ||
1986 | return 1; | |
1987 | } | |
1988 | ||
1989 | return 0; | |
1990 | } | |
1991 | ||
582511be PA |
1992 | /* Fetch the possibly triggered data watchpoint info and store it in |
1993 | CHILD. | |
d50171e4 | 1994 | |
582511be PA |
1995 | On some archs, like x86, that use debug registers to set |
1996 | watchpoints, it's possible that the way to know which watched | |
1997 | address trapped, is to check the register that is used to select | |
1998 | which address to watch. Problem is, between setting the watchpoint | |
1999 | and reading back which data address trapped, the user may change | |
2000 | the set of watchpoints, and, as a consequence, GDB changes the | |
2001 | debug registers in the inferior. To avoid reading back a stale | |
2002 | stopped-data-address when that happens, we cache in LP the fact | |
2003 | that a watchpoint trapped, and the corresponding data address, as | |
2004 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2005 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2006 | |
582511be PA |
2007 | static int |
2008 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2009 | { | |
2010 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2011 | { |
582511be | 2012 | struct thread_info *saved_thread; |
d50171e4 | 2013 | |
582511be PA |
2014 | saved_thread = current_thread; |
2015 | current_thread = get_lwp_thread (child); | |
2016 | ||
2017 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2018 | { |
15c66dd6 | 2019 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2020 | |
2021 | if (the_low_target.stopped_data_address != NULL) | |
2022 | child->stopped_data_address | |
2023 | = the_low_target.stopped_data_address (); | |
2024 | else | |
2025 | child->stopped_data_address = 0; | |
d50171e4 PA |
2026 | } |
2027 | ||
0bfdf32f | 2028 | current_thread = saved_thread; |
d50171e4 PA |
2029 | } |
2030 | ||
15c66dd6 | 2031 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2032 | } |
2033 | ||
de0d863e DB |
2034 | /* Return the ptrace options that we want to try to enable. */ |
2035 | ||
2036 | static int | |
2037 | linux_low_ptrace_options (int attached) | |
2038 | { | |
2039 | int options = 0; | |
2040 | ||
2041 | if (!attached) | |
2042 | options |= PTRACE_O_EXITKILL; | |
2043 | ||
2044 | if (report_fork_events) | |
2045 | options |= PTRACE_O_TRACEFORK; | |
2046 | ||
c269dbdb DB |
2047 | if (report_vfork_events) |
2048 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); | |
2049 | ||
de0d863e DB |
2050 | return options; |
2051 | } | |
2052 | ||
fa96cb38 PA |
2053 | /* Do low-level handling of the event, and check if we should go on |
2054 | and pass it to caller code. Return the affected lwp if we are, or | |
2055 | NULL otherwise. */ | |
2056 | ||
2057 | static struct lwp_info * | |
582511be | 2058 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2059 | { |
2060 | struct lwp_info *child; | |
2061 | struct thread_info *thread; | |
582511be | 2062 | int have_stop_pc = 0; |
fa96cb38 PA |
2063 | |
2064 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
2065 | ||
2066 | /* If we didn't find a process, one of two things presumably happened: | |
2067 | - A process we started and then detached from has exited. Ignore it. | |
2068 | - A process we are controlling has forked and the new child's stop | |
2069 | was reported to us by the kernel. Save its PID. */ | |
2070 | if (child == NULL && WIFSTOPPED (wstat)) | |
2071 | { | |
2072 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2073 | return NULL; | |
2074 | } | |
2075 | else if (child == NULL) | |
2076 | return NULL; | |
2077 | ||
2078 | thread = get_lwp_thread (child); | |
2079 | ||
2080 | child->stopped = 1; | |
2081 | ||
2082 | child->last_status = wstat; | |
2083 | ||
582511be PA |
2084 | /* Check if the thread has exited. */ |
2085 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2086 | { | |
2087 | if (debug_threads) | |
2088 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
2089 | if (num_lwps (pid_of (thread)) > 1) | |
2090 | { | |
2091 | ||
2092 | /* If there is at least one more LWP, then the exit signal was | |
2093 | not the end of the debugged application and should be | |
2094 | ignored. */ | |
2095 | delete_lwp (child); | |
2096 | return NULL; | |
2097 | } | |
2098 | else | |
2099 | { | |
2100 | /* This was the last lwp in the process. Since events are | |
2101 | serialized to GDB core, and we can't report this one | |
2102 | right now, but GDB core and the other target layers will | |
2103 | want to be notified about the exit code/signal, leave the | |
2104 | status pending for the next time we're able to report | |
2105 | it. */ | |
2106 | mark_lwp_dead (child, wstat); | |
2107 | return child; | |
2108 | } | |
2109 | } | |
2110 | ||
2111 | gdb_assert (WIFSTOPPED (wstat)); | |
2112 | ||
fa96cb38 PA |
2113 | if (WIFSTOPPED (wstat)) |
2114 | { | |
2115 | struct process_info *proc; | |
2116 | ||
c06cbd92 | 2117 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2118 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2119 | if (proc->tdesc == NULL) |
fa96cb38 | 2120 | { |
c06cbd92 YQ |
2121 | if (proc->attached) |
2122 | { | |
2123 | struct thread_info *saved_thread; | |
fa96cb38 | 2124 | |
c06cbd92 YQ |
2125 | /* This needs to happen after we have attached to the |
2126 | inferior and it is stopped for the first time, but | |
2127 | before we access any inferior registers. */ | |
2128 | saved_thread = current_thread; | |
2129 | current_thread = thread; | |
fa96cb38 | 2130 | |
c06cbd92 | 2131 | the_low_target.arch_setup (); |
fa96cb38 | 2132 | |
c06cbd92 | 2133 | current_thread = saved_thread; |
c06cbd92 YQ |
2134 | } |
2135 | else | |
2136 | { | |
2137 | /* The process is started, but GDBserver will do | |
2138 | architecture-specific setup after the program stops at | |
2139 | the first instruction. */ | |
2140 | child->status_pending_p = 1; | |
2141 | child->status_pending = wstat; | |
2142 | return child; | |
2143 | } | |
fa96cb38 PA |
2144 | } |
2145 | } | |
2146 | ||
fa96cb38 PA |
2147 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2148 | { | |
beed38b8 | 2149 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2150 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2151 | |
de0d863e | 2152 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2153 | child->must_set_ptrace_flags = 0; |
2154 | } | |
2155 | ||
582511be PA |
2156 | /* Be careful to not overwrite stop_pc until |
2157 | check_stopped_by_breakpoint is called. */ | |
fa96cb38 | 2158 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2159 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2160 | { |
582511be | 2161 | child->stop_pc = get_pc (child); |
de0d863e DB |
2162 | if (handle_extended_wait (child, wstat)) |
2163 | { | |
2164 | /* The event has been handled, so just return without | |
2165 | reporting it. */ | |
2166 | return NULL; | |
2167 | } | |
fa96cb38 PA |
2168 | } |
2169 | ||
3e572f71 PA |
2170 | /* Check first whether this was a SW/HW breakpoint before checking |
2171 | watchpoints, because at least s390 can't tell the data address of | |
2172 | hardware watchpoint hits, and returns stopped-by-watchpoint as | |
2173 | long as there's a watchpoint set. */ | |
2174 | if (WIFSTOPPED (wstat) && linux_wstatus_maybe_breakpoint (wstat)) | |
582511be PA |
2175 | { |
2176 | if (check_stopped_by_breakpoint (child)) | |
2177 | have_stop_pc = 1; | |
2178 | } | |
2179 | ||
3e572f71 PA |
2180 | /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint |
2181 | or hardware watchpoint. Check which is which if we got | |
2182 | TARGET_STOPPED_BY_HW_BREAKPOINT. */ | |
2183 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP | |
2184 | && (child->stop_reason == TARGET_STOPPED_BY_NO_REASON | |
2185 | || child->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
2186 | check_stopped_by_watchpoint (child); | |
2187 | ||
582511be PA |
2188 | if (!have_stop_pc) |
2189 | child->stop_pc = get_pc (child); | |
2190 | ||
fa96cb38 PA |
2191 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2192 | && child->stop_expected) | |
2193 | { | |
2194 | if (debug_threads) | |
2195 | debug_printf ("Expected stop.\n"); | |
2196 | child->stop_expected = 0; | |
2197 | ||
2198 | if (thread->last_resume_kind == resume_stop) | |
2199 | { | |
2200 | /* We want to report the stop to the core. Treat the | |
2201 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2202 | if (debug_threads) |
2203 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2204 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2205 | } |
2206 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2207 | { | |
2208 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2209 | pending. */ |
2bf6fb9d PA |
2210 | if (debug_threads) |
2211 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2212 | "while stopping threads.\n", | |
2213 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2214 | return NULL; |
2215 | } | |
2216 | else | |
2217 | { | |
2bf6fb9d PA |
2218 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2219 | if (debug_threads) | |
2220 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2221 | child->stepping ? "step" : "continue", | |
2222 | target_pid_to_str (ptid_of (thread))); | |
2223 | ||
fa96cb38 PA |
2224 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2225 | return NULL; | |
2226 | } | |
2227 | } | |
2228 | ||
582511be PA |
2229 | child->status_pending_p = 1; |
2230 | child->status_pending = wstat; | |
fa96cb38 PA |
2231 | return child; |
2232 | } | |
2233 | ||
20ba1ce6 PA |
2234 | /* Resume LWPs that are currently stopped without any pending status |
2235 | to report, but are resumed from the core's perspective. */ | |
2236 | ||
2237 | static void | |
2238 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
2239 | { | |
2240 | struct thread_info *thread = (struct thread_info *) entry; | |
2241 | struct lwp_info *lp = get_thread_lwp (thread); | |
2242 | ||
2243 | if (lp->stopped | |
2244 | && !lp->status_pending_p | |
2245 | && thread->last_resume_kind != resume_stop | |
2246 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
2247 | { | |
2248 | int step = thread->last_resume_kind == resume_step; | |
2249 | ||
2250 | if (debug_threads) | |
2251 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2252 | target_pid_to_str (ptid_of (thread)), | |
2253 | paddress (lp->stop_pc), | |
2254 | step); | |
2255 | ||
2256 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2257 | } | |
2258 | } | |
2259 | ||
fa96cb38 PA |
2260 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2261 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2262 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2263 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2264 | the stop status through the status pointer WSTAT. OPTIONS is | |
2265 | passed to the waitpid call. Return 0 if no event was found and | |
2266 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2267 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2268 | |
0d62e5e8 | 2269 | static int |
fa96cb38 PA |
2270 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2271 | int *wstatp, int options) | |
0d62e5e8 | 2272 | { |
d86d4aaf | 2273 | struct thread_info *event_thread; |
d50171e4 | 2274 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2275 | sigset_t block_mask, prev_mask; |
d50171e4 | 2276 | |
fa96cb38 | 2277 | retry: |
d86d4aaf DE |
2278 | /* N.B. event_thread points to the thread_info struct that contains |
2279 | event_child. Keep them in sync. */ | |
2280 | event_thread = NULL; | |
d50171e4 PA |
2281 | event_child = NULL; |
2282 | requested_child = NULL; | |
0d62e5e8 | 2283 | |
95954743 | 2284 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2285 | |
fa96cb38 | 2286 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2287 | { |
d86d4aaf | 2288 | event_thread = (struct thread_info *) |
fa96cb38 | 2289 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
2290 | if (event_thread != NULL) |
2291 | event_child = get_thread_lwp (event_thread); | |
2292 | if (debug_threads && event_thread) | |
2293 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2294 | } |
fa96cb38 | 2295 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2296 | { |
fa96cb38 | 2297 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2298 | |
bde24c0a | 2299 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2300 | && requested_child->status_pending_p |
2301 | && requested_child->collecting_fast_tracepoint) | |
2302 | { | |
2303 | enqueue_one_deferred_signal (requested_child, | |
2304 | &requested_child->status_pending); | |
2305 | requested_child->status_pending_p = 0; | |
2306 | requested_child->status_pending = 0; | |
2307 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2308 | } | |
2309 | ||
2310 | if (requested_child->suspended | |
2311 | && requested_child->status_pending_p) | |
38e08fca GB |
2312 | { |
2313 | internal_error (__FILE__, __LINE__, | |
2314 | "requesting an event out of a" | |
2315 | " suspended child?"); | |
2316 | } | |
fa593d66 | 2317 | |
d50171e4 | 2318 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2319 | { |
2320 | event_child = requested_child; | |
2321 | event_thread = get_lwp_thread (event_child); | |
2322 | } | |
0d62e5e8 | 2323 | } |
611cb4a5 | 2324 | |
0d62e5e8 DJ |
2325 | if (event_child != NULL) |
2326 | { | |
bd99dc85 | 2327 | if (debug_threads) |
87ce2a04 | 2328 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2329 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2330 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2331 | event_child->status_pending_p = 0; |
2332 | event_child->status_pending = 0; | |
0bfdf32f | 2333 | current_thread = event_thread; |
d86d4aaf | 2334 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2335 | } |
2336 | ||
fa96cb38 PA |
2337 | /* But if we don't find a pending event, we'll have to wait. |
2338 | ||
2339 | We only enter this loop if no process has a pending wait status. | |
2340 | Thus any action taken in response to a wait status inside this | |
2341 | loop is responding as soon as we detect the status, not after any | |
2342 | pending events. */ | |
d8301ad1 | 2343 | |
fa96cb38 PA |
2344 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2345 | all signals while here. */ | |
2346 | sigfillset (&block_mask); | |
2347 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2348 | ||
582511be PA |
2349 | /* Always pull all events out of the kernel. We'll randomly select |
2350 | an event LWP out of all that have events, to prevent | |
2351 | starvation. */ | |
fa96cb38 | 2352 | while (event_child == NULL) |
0d62e5e8 | 2353 | { |
fa96cb38 | 2354 | pid_t ret = 0; |
0d62e5e8 | 2355 | |
fa96cb38 PA |
2356 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2357 | quirks: | |
0d62e5e8 | 2358 | |
fa96cb38 PA |
2359 | - If the thread group leader exits while other threads in the |
2360 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2361 | waitpid won't return an exit status until the other threads | |
2362 | in the group are reaped. | |
611cb4a5 | 2363 | |
fa96cb38 PA |
2364 | - When a non-leader thread execs, that thread just vanishes |
2365 | without reporting an exit (so we'd hang if we waited for it | |
2366 | explicitly in that case). The exec event is reported to | |
2367 | the TGID pid (although we don't currently enable exec | |
2368 | events). */ | |
2369 | errno = 0; | |
2370 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2371 | |
fa96cb38 PA |
2372 | if (debug_threads) |
2373 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2374 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2375 | |
fa96cb38 | 2376 | if (ret > 0) |
0d62e5e8 | 2377 | { |
89be2091 | 2378 | if (debug_threads) |
bd99dc85 | 2379 | { |
fa96cb38 PA |
2380 | debug_printf ("LLW: waitpid %ld received %s\n", |
2381 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2382 | } |
89be2091 | 2383 | |
582511be PA |
2384 | /* Filter all events. IOW, leave all events pending. We'll |
2385 | randomly select an event LWP out of all that have events | |
2386 | below. */ | |
2387 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2388 | /* Retry until nothing comes out of waitpid. A single |
2389 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2390 | continue; |
2391 | } | |
2392 | ||
20ba1ce6 PA |
2393 | /* Now that we've pulled all events out of the kernel, resume |
2394 | LWPs that don't have an interesting event to report. */ | |
2395 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2396 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2397 | ||
2398 | /* ... and find an LWP with a status to report to the core, if | |
2399 | any. */ | |
582511be PA |
2400 | event_thread = (struct thread_info *) |
2401 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2402 | if (event_thread != NULL) | |
2403 | { | |
2404 | event_child = get_thread_lwp (event_thread); | |
2405 | *wstatp = event_child->status_pending; | |
2406 | event_child->status_pending_p = 0; | |
2407 | event_child->status_pending = 0; | |
2408 | break; | |
2409 | } | |
2410 | ||
fa96cb38 PA |
2411 | /* Check for zombie thread group leaders. Those can't be reaped |
2412 | until all other threads in the thread group are. */ | |
2413 | check_zombie_leaders (); | |
2414 | ||
2415 | /* If there are no resumed children left in the set of LWPs we | |
2416 | want to wait for, bail. We can't just block in | |
2417 | waitpid/sigsuspend, because lwps might have been left stopped | |
2418 | in trace-stop state, and we'd be stuck forever waiting for | |
2419 | their status to change (which would only happen if we resumed | |
2420 | them). Even if WNOHANG is set, this return code is preferred | |
2421 | over 0 (below), as it is more detailed. */ | |
2422 | if ((find_inferior (&all_threads, | |
2423 | not_stopped_callback, | |
2424 | &wait_ptid) == NULL)) | |
a6dbe5df | 2425 | { |
fa96cb38 PA |
2426 | if (debug_threads) |
2427 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2428 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2429 | return -1; | |
a6dbe5df PA |
2430 | } |
2431 | ||
fa96cb38 PA |
2432 | /* No interesting event to report to the caller. */ |
2433 | if ((options & WNOHANG)) | |
24a09b5f | 2434 | { |
fa96cb38 PA |
2435 | if (debug_threads) |
2436 | debug_printf ("WNOHANG set, no event found\n"); | |
2437 | ||
2438 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2439 | return 0; | |
24a09b5f DJ |
2440 | } |
2441 | ||
fa96cb38 PA |
2442 | /* Block until we get an event reported with SIGCHLD. */ |
2443 | if (debug_threads) | |
2444 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2445 | |
fa96cb38 PA |
2446 | sigsuspend (&prev_mask); |
2447 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2448 | goto retry; | |
2449 | } | |
d50171e4 | 2450 | |
fa96cb38 | 2451 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2452 | |
0bfdf32f | 2453 | current_thread = event_thread; |
d50171e4 | 2454 | |
fa96cb38 PA |
2455 | /* Check for thread exit. */ |
2456 | if (! WIFSTOPPED (*wstatp)) | |
2457 | { | |
2458 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2459 | ||
2460 | if (debug_threads) | |
2461 | debug_printf ("LWP %d is the last lwp of process. " | |
2462 | "Process %ld exiting.\n", | |
2463 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2464 | return lwpid_of (event_thread); |
611cb4a5 | 2465 | } |
0d62e5e8 | 2466 | |
fa96cb38 PA |
2467 | return lwpid_of (event_thread); |
2468 | } | |
2469 | ||
2470 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2471 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2472 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2473 | the stop status through the status pointer WSTAT. OPTIONS is | |
2474 | passed to the waitpid call. Return 0 if no event was found and | |
2475 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2476 | was found. Return the PID of the stopped child otherwise. */ | |
2477 | ||
2478 | static int | |
2479 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2480 | { | |
2481 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2482 | } |
2483 | ||
6bf5e0ba PA |
2484 | /* Count the LWP's that have had events. */ |
2485 | ||
2486 | static int | |
2487 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2488 | { | |
d86d4aaf | 2489 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2490 | struct lwp_info *lp = get_thread_lwp (thread); |
6bf5e0ba PA |
2491 | int *count = data; |
2492 | ||
2493 | gdb_assert (count != NULL); | |
2494 | ||
582511be | 2495 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2496 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2497 | && lp->status_pending_p) |
6bf5e0ba PA |
2498 | (*count)++; |
2499 | ||
2500 | return 0; | |
2501 | } | |
2502 | ||
2503 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2504 | ||
2505 | static int | |
2506 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2507 | { | |
d86d4aaf DE |
2508 | struct thread_info *thread = (struct thread_info *) entry; |
2509 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2510 | |
8336d594 PA |
2511 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2512 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2513 | && lp->status_pending_p) |
2514 | return 1; | |
2515 | else | |
2516 | return 0; | |
2517 | } | |
2518 | ||
b90fc188 | 2519 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2520 | |
2521 | static int | |
2522 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2523 | { | |
d86d4aaf | 2524 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2525 | struct lwp_info *lp = get_thread_lwp (thread); |
6bf5e0ba PA |
2526 | int *selector = data; |
2527 | ||
2528 | gdb_assert (selector != NULL); | |
2529 | ||
582511be | 2530 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2531 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2532 | && lp->status_pending_p) |
6bf5e0ba PA |
2533 | if ((*selector)-- == 0) |
2534 | return 1; | |
2535 | ||
2536 | return 0; | |
2537 | } | |
2538 | ||
6bf5e0ba PA |
2539 | /* Select one LWP out of those that have events pending. */ |
2540 | ||
2541 | static void | |
2542 | select_event_lwp (struct lwp_info **orig_lp) | |
2543 | { | |
2544 | int num_events = 0; | |
2545 | int random_selector; | |
582511be PA |
2546 | struct thread_info *event_thread = NULL; |
2547 | ||
2548 | /* In all-stop, give preference to the LWP that is being | |
2549 | single-stepped. There will be at most one, and it's the LWP that | |
2550 | the core is most interested in. If we didn't do this, then we'd | |
2551 | have to handle pending step SIGTRAPs somehow in case the core | |
2552 | later continues the previously-stepped thread, otherwise we'd | |
2553 | report the pending SIGTRAP, and the core, not having stepped the | |
2554 | thread, wouldn't understand what the trap was for, and therefore | |
2555 | would report it to the user as a random signal. */ | |
2556 | if (!non_stop) | |
6bf5e0ba | 2557 | { |
582511be PA |
2558 | event_thread |
2559 | = (struct thread_info *) find_inferior (&all_threads, | |
2560 | select_singlestep_lwp_callback, | |
2561 | NULL); | |
2562 | if (event_thread != NULL) | |
2563 | { | |
2564 | if (debug_threads) | |
2565 | debug_printf ("SEL: Select single-step %s\n", | |
2566 | target_pid_to_str (ptid_of (event_thread))); | |
2567 | } | |
6bf5e0ba | 2568 | } |
582511be | 2569 | if (event_thread == NULL) |
6bf5e0ba PA |
2570 | { |
2571 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2572 | which have had events. */ |
6bf5e0ba | 2573 | |
b90fc188 | 2574 | /* First see how many events we have. */ |
d86d4aaf | 2575 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2576 | gdb_assert (num_events > 0); |
6bf5e0ba | 2577 | |
b90fc188 PA |
2578 | /* Now randomly pick a LWP out of those that have had |
2579 | events. */ | |
6bf5e0ba PA |
2580 | random_selector = (int) |
2581 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2582 | ||
2583 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2584 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2585 | num_events, random_selector); | |
6bf5e0ba | 2586 | |
d86d4aaf DE |
2587 | event_thread |
2588 | = (struct thread_info *) find_inferior (&all_threads, | |
2589 | select_event_lwp_callback, | |
2590 | &random_selector); | |
6bf5e0ba PA |
2591 | } |
2592 | ||
d86d4aaf | 2593 | if (event_thread != NULL) |
6bf5e0ba | 2594 | { |
d86d4aaf DE |
2595 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2596 | ||
6bf5e0ba PA |
2597 | /* Switch the event LWP. */ |
2598 | *orig_lp = event_lp; | |
2599 | } | |
2600 | } | |
2601 | ||
7984d532 PA |
2602 | /* Decrement the suspend count of an LWP. */ |
2603 | ||
2604 | static int | |
2605 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2606 | { | |
d86d4aaf DE |
2607 | struct thread_info *thread = (struct thread_info *) entry; |
2608 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2609 | |
2610 | /* Ignore EXCEPT. */ | |
2611 | if (lwp == except) | |
2612 | return 0; | |
2613 | ||
2614 | lwp->suspended--; | |
2615 | ||
2616 | gdb_assert (lwp->suspended >= 0); | |
2617 | return 0; | |
2618 | } | |
2619 | ||
2620 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2621 | NULL. */ | |
2622 | ||
2623 | static void | |
2624 | unsuspend_all_lwps (struct lwp_info *except) | |
2625 | { | |
d86d4aaf | 2626 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2627 | } |
2628 | ||
fa593d66 PA |
2629 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2630 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2631 | void *data); | |
2632 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2633 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2634 | struct target_waitstatus *ourstatus, | |
2635 | int target_options); | |
2636 | ||
2637 | /* Stabilize threads (move out of jump pads). | |
2638 | ||
2639 | If a thread is midway collecting a fast tracepoint, we need to | |
2640 | finish the collection and move it out of the jump pad before | |
2641 | reporting the signal. | |
2642 | ||
2643 | This avoids recursion while collecting (when a signal arrives | |
2644 | midway, and the signal handler itself collects), which would trash | |
2645 | the trace buffer. In case the user set a breakpoint in a signal | |
2646 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2647 | Most importantly, there are certain things we can't do safely if | |
2648 | threads are stopped in a jump pad (or in its callee's). For | |
2649 | example: | |
2650 | ||
2651 | - starting a new trace run. A thread still collecting the | |
2652 | previous run, could trash the trace buffer when resumed. The trace | |
2653 | buffer control structures would have been reset but the thread had | |
2654 | no way to tell. The thread could even midway memcpy'ing to the | |
2655 | buffer, which would mean that when resumed, it would clobber the | |
2656 | trace buffer that had been set for a new run. | |
2657 | ||
2658 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2659 | safely. Say you do tstart while a thread is stopped midway while | |
2660 | collecting. When the thread is later resumed, it finishes the | |
2661 | collection, and returns to the jump pad, to execute the original | |
2662 | instruction that was under the tracepoint jump at the time the | |
2663 | older run had been started. If the jump pad had been rewritten | |
2664 | since for something else in the new run, the thread would now | |
2665 | execute the wrong / random instructions. */ | |
2666 | ||
2667 | static void | |
2668 | linux_stabilize_threads (void) | |
2669 | { | |
0bfdf32f | 2670 | struct thread_info *saved_thread; |
d86d4aaf | 2671 | struct thread_info *thread_stuck; |
fa593d66 | 2672 | |
d86d4aaf DE |
2673 | thread_stuck |
2674 | = (struct thread_info *) find_inferior (&all_threads, | |
2675 | stuck_in_jump_pad_callback, | |
2676 | NULL); | |
2677 | if (thread_stuck != NULL) | |
fa593d66 | 2678 | { |
b4d51a55 | 2679 | if (debug_threads) |
87ce2a04 | 2680 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2681 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2682 | return; |
2683 | } | |
2684 | ||
0bfdf32f | 2685 | saved_thread = current_thread; |
fa593d66 PA |
2686 | |
2687 | stabilizing_threads = 1; | |
2688 | ||
2689 | /* Kick 'em all. */ | |
d86d4aaf | 2690 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2691 | |
2692 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2693 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2694 | { |
2695 | struct target_waitstatus ourstatus; | |
2696 | struct lwp_info *lwp; | |
fa593d66 PA |
2697 | int wstat; |
2698 | ||
2699 | /* Note that we go through the full wait even loop. While | |
2700 | moving threads out of jump pad, we need to be able to step | |
2701 | over internal breakpoints and such. */ | |
32fcada3 | 2702 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2703 | |
2704 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2705 | { | |
0bfdf32f | 2706 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2707 | |
2708 | /* Lock it. */ | |
2709 | lwp->suspended++; | |
2710 | ||
a493e3e2 | 2711 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2712 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2713 | { |
2ea28649 | 2714 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2715 | enqueue_one_deferred_signal (lwp, &wstat); |
2716 | } | |
2717 | } | |
2718 | } | |
2719 | ||
d86d4aaf | 2720 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2721 | |
2722 | stabilizing_threads = 0; | |
2723 | ||
0bfdf32f | 2724 | current_thread = saved_thread; |
fa593d66 | 2725 | |
b4d51a55 | 2726 | if (debug_threads) |
fa593d66 | 2727 | { |
d86d4aaf DE |
2728 | thread_stuck |
2729 | = (struct thread_info *) find_inferior (&all_threads, | |
2730 | stuck_in_jump_pad_callback, | |
2731 | NULL); | |
2732 | if (thread_stuck != NULL) | |
87ce2a04 | 2733 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2734 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2735 | } |
2736 | } | |
2737 | ||
582511be PA |
2738 | static void async_file_mark (void); |
2739 | ||
2740 | /* Convenience function that is called when the kernel reports an | |
2741 | event that is not passed out to GDB. */ | |
2742 | ||
2743 | static ptid_t | |
2744 | ignore_event (struct target_waitstatus *ourstatus) | |
2745 | { | |
2746 | /* If we got an event, there may still be others, as a single | |
2747 | SIGCHLD can indicate more than one child stopped. This forces | |
2748 | another target_wait call. */ | |
2749 | async_file_mark (); | |
2750 | ||
2751 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2752 | return null_ptid; | |
2753 | } | |
2754 | ||
0d62e5e8 | 2755 | /* Wait for process, returns status. */ |
da6d8c04 | 2756 | |
95954743 PA |
2757 | static ptid_t |
2758 | linux_wait_1 (ptid_t ptid, | |
2759 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2760 | { |
e5f1222d | 2761 | int w; |
fc7238bb | 2762 | struct lwp_info *event_child; |
bd99dc85 | 2763 | int options; |
bd99dc85 | 2764 | int pid; |
6bf5e0ba PA |
2765 | int step_over_finished; |
2766 | int bp_explains_trap; | |
2767 | int maybe_internal_trap; | |
2768 | int report_to_gdb; | |
219f2f23 | 2769 | int trace_event; |
c2d6af84 | 2770 | int in_step_range; |
bd99dc85 | 2771 | |
87ce2a04 DE |
2772 | if (debug_threads) |
2773 | { | |
2774 | debug_enter (); | |
2775 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2776 | } | |
2777 | ||
bd99dc85 PA |
2778 | /* Translate generic target options into linux options. */ |
2779 | options = __WALL; | |
2780 | if (target_options & TARGET_WNOHANG) | |
2781 | options |= WNOHANG; | |
0d62e5e8 | 2782 | |
fa593d66 PA |
2783 | bp_explains_trap = 0; |
2784 | trace_event = 0; | |
c2d6af84 | 2785 | in_step_range = 0; |
bd99dc85 PA |
2786 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2787 | ||
6bf5e0ba PA |
2788 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2789 | pid = linux_wait_for_event (ptid, &w, options); | |
2790 | else | |
2791 | { | |
2792 | if (debug_threads) | |
87ce2a04 DE |
2793 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2794 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2795 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2796 | } | |
2797 | ||
fa96cb38 | 2798 | if (pid == 0) |
87ce2a04 | 2799 | { |
fa96cb38 PA |
2800 | gdb_assert (target_options & TARGET_WNOHANG); |
2801 | ||
87ce2a04 DE |
2802 | if (debug_threads) |
2803 | { | |
fa96cb38 PA |
2804 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2805 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2806 | debug_exit (); |
2807 | } | |
fa96cb38 PA |
2808 | |
2809 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2810 | return null_ptid; |
2811 | } | |
fa96cb38 PA |
2812 | else if (pid == -1) |
2813 | { | |
2814 | if (debug_threads) | |
2815 | { | |
2816 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2817 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2818 | debug_exit (); | |
2819 | } | |
bd99dc85 | 2820 | |
fa96cb38 PA |
2821 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2822 | return null_ptid; | |
2823 | } | |
0d62e5e8 | 2824 | |
0bfdf32f | 2825 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 2826 | |
fa96cb38 PA |
2827 | /* linux_wait_for_event only returns an exit status for the last |
2828 | child of a process. Report it. */ | |
2829 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2830 | { |
fa96cb38 | 2831 | if (WIFEXITED (w)) |
0d62e5e8 | 2832 | { |
fa96cb38 PA |
2833 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2834 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2835 | |
fa96cb38 | 2836 | if (debug_threads) |
bd99dc85 | 2837 | { |
fa96cb38 PA |
2838 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2839 | "retcode %d\n", | |
0bfdf32f | 2840 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2841 | WEXITSTATUS (w)); |
2842 | debug_exit (); | |
bd99dc85 | 2843 | } |
fa96cb38 PA |
2844 | } |
2845 | else | |
2846 | { | |
2847 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2848 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2849 | |
fa96cb38 PA |
2850 | if (debug_threads) |
2851 | { | |
2852 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2853 | "signal %d\n", | |
0bfdf32f | 2854 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2855 | WTERMSIG (w)); |
2856 | debug_exit (); | |
2857 | } | |
0d62e5e8 | 2858 | } |
fa96cb38 | 2859 | |
0bfdf32f | 2860 | return ptid_of (current_thread); |
da6d8c04 DJ |
2861 | } |
2862 | ||
8090aef2 PA |
2863 | /* If step-over executes a breakpoint instruction, it means a |
2864 | gdb/gdbserver breakpoint had been planted on top of a permanent | |
2865 | breakpoint. The PC has been adjusted by | |
2866 | check_stopped_by_breakpoint to point at the breakpoint address. | |
2867 | Advance the PC manually past the breakpoint, otherwise the | |
2868 | program would keep trapping the permanent breakpoint forever. */ | |
2869 | if (!ptid_equal (step_over_bkpt, null_ptid) | |
15c66dd6 | 2870 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) |
8090aef2 | 2871 | { |
9beb7c4e | 2872 | unsigned int increment_pc = the_low_target.breakpoint_len; |
8090aef2 PA |
2873 | |
2874 | if (debug_threads) | |
2875 | { | |
2876 | debug_printf ("step-over for %s executed software breakpoint\n", | |
2877 | target_pid_to_str (ptid_of (current_thread))); | |
2878 | } | |
2879 | ||
2880 | if (increment_pc != 0) | |
2881 | { | |
2882 | struct regcache *regcache | |
2883 | = get_thread_regcache (current_thread, 1); | |
2884 | ||
2885 | event_child->stop_pc += increment_pc; | |
2886 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2887 | ||
2888 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 2889 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
2890 | } |
2891 | } | |
2892 | ||
6bf5e0ba PA |
2893 | /* If this event was not handled before, and is not a SIGTRAP, we |
2894 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2895 | a breakpoint is inserted at the current PC. If this target does | |
2896 | not support internal breakpoints at all, we also report the | |
2897 | SIGTRAP without further processing; it's of no concern to us. */ | |
2898 | maybe_internal_trap | |
2899 | = (supports_breakpoints () | |
2900 | && (WSTOPSIG (w) == SIGTRAP | |
2901 | || ((WSTOPSIG (w) == SIGILL | |
2902 | || WSTOPSIG (w) == SIGSEGV) | |
2903 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2904 | ||
2905 | if (maybe_internal_trap) | |
2906 | { | |
2907 | /* Handle anything that requires bookkeeping before deciding to | |
2908 | report the event or continue waiting. */ | |
2909 | ||
2910 | /* First check if we can explain the SIGTRAP with an internal | |
2911 | breakpoint, or if we should possibly report the event to GDB. | |
2912 | Do this before anything that may remove or insert a | |
2913 | breakpoint. */ | |
2914 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2915 | ||
2916 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2917 | finished. If so, tweak the state machine accordingly, | |
2918 | reinsert breakpoints and delete any reinsert (software | |
2919 | single-step) breakpoints. */ | |
2920 | step_over_finished = finish_step_over (event_child); | |
2921 | ||
2922 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2923 | check_breakpoints (event_child->stop_pc); | |
2924 | ||
219f2f23 PA |
2925 | /* Handle tracepoint data collecting. This may overflow the |
2926 | trace buffer, and cause a tracing stop, removing | |
2927 | breakpoints. */ | |
2928 | trace_event = handle_tracepoints (event_child); | |
2929 | ||
6bf5e0ba PA |
2930 | if (bp_explains_trap) |
2931 | { | |
2932 | /* If we stepped or ran into an internal breakpoint, we've | |
2933 | already handled it. So next time we resume (from this | |
2934 | PC), we should step over it. */ | |
2935 | if (debug_threads) | |
87ce2a04 | 2936 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2937 | |
8b07ae33 PA |
2938 | if (breakpoint_here (event_child->stop_pc)) |
2939 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2940 | } |
2941 | } | |
2942 | else | |
2943 | { | |
2944 | /* We have some other signal, possibly a step-over dance was in | |
2945 | progress, and it should be cancelled too. */ | |
2946 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2947 | } |
2948 | ||
2949 | /* We have all the data we need. Either report the event to GDB, or | |
2950 | resume threads and keep waiting for more. */ | |
2951 | ||
2952 | /* If we're collecting a fast tracepoint, finish the collection and | |
2953 | move out of the jump pad before delivering a signal. See | |
2954 | linux_stabilize_threads. */ | |
2955 | ||
2956 | if (WIFSTOPPED (w) | |
2957 | && WSTOPSIG (w) != SIGTRAP | |
2958 | && supports_fast_tracepoints () | |
58b4daa5 | 2959 | && agent_loaded_p ()) |
fa593d66 PA |
2960 | { |
2961 | if (debug_threads) | |
87ce2a04 DE |
2962 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2963 | "to defer or adjust it.\n", | |
0bfdf32f | 2964 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2965 | |
2966 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 2967 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
2968 | && maybe_move_out_of_jump_pad (event_child, &w)) |
2969 | { | |
2970 | enqueue_one_deferred_signal (event_child, &w); | |
2971 | ||
2972 | if (debug_threads) | |
87ce2a04 | 2973 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 2974 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2975 | |
2976 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
2977 | |
2978 | return ignore_event (ourstatus); | |
fa593d66 PA |
2979 | } |
2980 | } | |
219f2f23 | 2981 | |
fa593d66 PA |
2982 | if (event_child->collecting_fast_tracepoint) |
2983 | { | |
2984 | if (debug_threads) | |
87ce2a04 DE |
2985 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
2986 | "Check if we're already there.\n", | |
0bfdf32f | 2987 | lwpid_of (current_thread), |
87ce2a04 | 2988 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
2989 | |
2990 | trace_event = 1; | |
2991 | ||
2992 | event_child->collecting_fast_tracepoint | |
2993 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2994 | ||
2995 | if (event_child->collecting_fast_tracepoint != 1) | |
2996 | { | |
2997 | /* No longer need this breakpoint. */ | |
2998 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2999 | { | |
3000 | if (debug_threads) | |
87ce2a04 DE |
3001 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3002 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3003 | |
3004 | /* Other running threads could hit this breakpoint. | |
3005 | We don't handle moribund locations like GDB does, | |
3006 | instead we always pause all threads when removing | |
3007 | breakpoints, so that any step-over or | |
3008 | decr_pc_after_break adjustment is always taken | |
3009 | care of while the breakpoint is still | |
3010 | inserted. */ | |
3011 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3012 | |
3013 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3014 | event_child->exit_jump_pad_bkpt = NULL; | |
3015 | ||
3016 | unstop_all_lwps (1, event_child); | |
3017 | ||
3018 | gdb_assert (event_child->suspended >= 0); | |
3019 | } | |
3020 | } | |
3021 | ||
3022 | if (event_child->collecting_fast_tracepoint == 0) | |
3023 | { | |
3024 | if (debug_threads) | |
87ce2a04 DE |
3025 | debug_printf ("fast tracepoint finished " |
3026 | "collecting successfully.\n"); | |
fa593d66 PA |
3027 | |
3028 | /* We may have a deferred signal to report. */ | |
3029 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3030 | { | |
3031 | if (debug_threads) | |
87ce2a04 | 3032 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3033 | } |
3c11dd79 | 3034 | else |
fa593d66 | 3035 | { |
3c11dd79 | 3036 | if (debug_threads) |
87ce2a04 | 3037 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3038 | |
3039 | if (stabilizing_threads) | |
3040 | { | |
3041 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3042 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3043 | |
3044 | if (debug_threads) | |
3045 | { | |
3046 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3047 | "while stabilizing threads\n", | |
0bfdf32f | 3048 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3049 | debug_exit (); |
3050 | } | |
3051 | ||
0bfdf32f | 3052 | return ptid_of (current_thread); |
fa593d66 PA |
3053 | } |
3054 | } | |
3055 | } | |
6bf5e0ba PA |
3056 | } |
3057 | ||
e471f25b PA |
3058 | /* Check whether GDB would be interested in this event. */ |
3059 | ||
3060 | /* If GDB is not interested in this signal, don't stop other | |
3061 | threads, and don't report it to GDB. Just resume the inferior | |
3062 | right away. We do this for threading-related signals as well as | |
3063 | any that GDB specifically requested we ignore. But never ignore | |
3064 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3065 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3066 | handler. Also never ignore signals that could be caused by a |
3067 | breakpoint. */ | |
e471f25b PA |
3068 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
3069 | thread library? */ | |
3070 | if (WIFSTOPPED (w) | |
0bfdf32f | 3071 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3072 | && ( |
1a981360 | 3073 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3074 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3075 | && (WSTOPSIG (w) == __SIGRTMIN |
3076 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3077 | || | |
3078 | #endif | |
2ea28649 | 3079 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3080 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3081 | && current_thread->last_resume_kind == resume_stop) |
3082 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3083 | { |
3084 | siginfo_t info, *info_p; | |
3085 | ||
3086 | if (debug_threads) | |
87ce2a04 | 3087 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3088 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3089 | |
0bfdf32f | 3090 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3091 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3092 | info_p = &info; |
3093 | else | |
3094 | info_p = NULL; | |
3095 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3096 | WSTOPSIG (w), info_p); | |
582511be | 3097 | return ignore_event (ourstatus); |
e471f25b PA |
3098 | } |
3099 | ||
c2d6af84 PA |
3100 | /* Note that all addresses are always "out of the step range" when |
3101 | there's no range to begin with. */ | |
3102 | in_step_range = lwp_in_step_range (event_child); | |
3103 | ||
3104 | /* If GDB wanted this thread to single step, and the thread is out | |
3105 | of the step range, we always want to report the SIGTRAP, and let | |
3106 | GDB handle it. Watchpoints should always be reported. So should | |
3107 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3108 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3109 | do, we're be able to handle GDB breakpoints on top of internal | |
3110 | breakpoints, by handling the internal breakpoint and still | |
3111 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
3112 | won't see the breakpoint hit. */ | |
6bf5e0ba | 3113 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3114 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3115 | && !in_step_range) |
15c66dd6 | 3116 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
c2d6af84 | 3117 | || (!step_over_finished && !in_step_range |
493e2a69 | 3118 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 3119 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3120 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3121 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3122 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3123 | |
3124 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3125 | |
3126 | /* We found no reason GDB would want us to stop. We either hit one | |
3127 | of our own breakpoints, or finished an internal step GDB | |
3128 | shouldn't know about. */ | |
3129 | if (!report_to_gdb) | |
3130 | { | |
3131 | if (debug_threads) | |
3132 | { | |
3133 | if (bp_explains_trap) | |
87ce2a04 | 3134 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3135 | if (step_over_finished) |
87ce2a04 | 3136 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3137 | if (trace_event) |
87ce2a04 | 3138 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3139 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3140 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3141 | paddress (event_child->stop_pc), | |
3142 | paddress (event_child->step_range_start), | |
3143 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3144 | } |
3145 | ||
3146 | /* We're not reporting this breakpoint to GDB, so apply the | |
3147 | decr_pc_after_break adjustment to the inferior's regcache | |
3148 | ourselves. */ | |
3149 | ||
3150 | if (the_low_target.set_pc != NULL) | |
3151 | { | |
3152 | struct regcache *regcache | |
0bfdf32f | 3153 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3154 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3155 | } | |
3156 | ||
7984d532 PA |
3157 | /* We may have finished stepping over a breakpoint. If so, |
3158 | we've stopped and suspended all LWPs momentarily except the | |
3159 | stepping one. This is where we resume them all again. We're | |
3160 | going to keep waiting, so use proceed, which handles stepping | |
3161 | over the next breakpoint. */ | |
6bf5e0ba | 3162 | if (debug_threads) |
87ce2a04 | 3163 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
3164 | |
3165 | if (step_over_finished) | |
3166 | unsuspend_all_lwps (event_child); | |
3167 | ||
6bf5e0ba | 3168 | proceed_all_lwps (); |
582511be | 3169 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3170 | } |
3171 | ||
3172 | if (debug_threads) | |
3173 | { | |
00db26fa | 3174 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 PA |
3175 | { |
3176 | char *str; | |
3177 | ||
3178 | str = target_waitstatus_to_string (&event_child->waitstatus); | |
3179 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", | |
3180 | lwpid_of (get_lwp_thread (event_child)), str); | |
3181 | xfree (str); | |
3182 | } | |
0bfdf32f | 3183 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3184 | { |
3185 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3186 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3187 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3188 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3189 | } |
15c66dd6 | 3190 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3191 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3192 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3193 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3194 | if (debug_threads) |
87ce2a04 | 3195 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3196 | } |
3197 | ||
3198 | /* Alright, we're going to report a stop. */ | |
3199 | ||
582511be | 3200 | if (!stabilizing_threads) |
6bf5e0ba PA |
3201 | { |
3202 | /* In all-stop, stop all threads. */ | |
582511be PA |
3203 | if (!non_stop) |
3204 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
3205 | |
3206 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3207 | from among those that have had events. Giving equal priority | |
3208 | to all LWPs that have had events helps prevent | |
3209 | starvation. */ | |
3210 | if (ptid_equal (ptid, minus_one_ptid)) | |
3211 | { | |
3212 | event_child->status_pending_p = 1; | |
3213 | event_child->status_pending = w; | |
3214 | ||
3215 | select_event_lwp (&event_child); | |
3216 | ||
0bfdf32f GB |
3217 | /* current_thread and event_child must stay in sync. */ |
3218 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 3219 | |
6bf5e0ba PA |
3220 | event_child->status_pending_p = 0; |
3221 | w = event_child->status_pending; | |
3222 | } | |
3223 | ||
c03e6ccc | 3224 | if (step_over_finished) |
582511be PA |
3225 | { |
3226 | if (!non_stop) | |
3227 | { | |
3228 | /* If we were doing a step-over, all other threads but | |
3229 | the stepping one had been paused in start_step_over, | |
3230 | with their suspend counts incremented. We don't want | |
3231 | to do a full unstop/unpause, because we're in | |
3232 | all-stop mode (so we want threads stopped), but we | |
3233 | still need to unsuspend the other threads, to | |
3234 | decrement their `suspended' count back. */ | |
3235 | unsuspend_all_lwps (event_child); | |
3236 | } | |
3237 | else | |
3238 | { | |
3239 | /* If we just finished a step-over, then all threads had | |
3240 | been momentarily paused. In all-stop, that's fine, | |
3241 | we want threads stopped by now anyway. In non-stop, | |
3242 | we need to re-resume threads that GDB wanted to be | |
3243 | running. */ | |
3244 | unstop_all_lwps (1, event_child); | |
3245 | } | |
3246 | } | |
c03e6ccc | 3247 | |
fa593d66 | 3248 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3249 | if (!non_stop) |
3250 | stabilize_threads (); | |
6bf5e0ba PA |
3251 | } |
3252 | else | |
3253 | { | |
3254 | /* If we just finished a step-over, then all threads had been | |
3255 | momentarily paused. In all-stop, that's fine, we want | |
3256 | threads stopped by now anyway. In non-stop, we need to | |
3257 | re-resume threads that GDB wanted to be running. */ | |
3258 | if (step_over_finished) | |
7984d532 | 3259 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3260 | } |
3261 | ||
00db26fa | 3262 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3263 | { |
00db26fa PA |
3264 | /* If the reported event is an exit, fork, vfork or exec, let |
3265 | GDB know. */ | |
3266 | *ourstatus = event_child->waitstatus; | |
de0d863e DB |
3267 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3268 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3269 | } | |
3270 | else | |
3271 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3272 | |
582511be | 3273 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3274 | it was a software breakpoint, and the client doesn't know we can |
3275 | adjust the breakpoint ourselves. */ | |
3276 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3277 | && !swbreak_feature) | |
582511be PA |
3278 | { |
3279 | int decr_pc = the_low_target.decr_pc_after_break; | |
3280 | ||
3281 | if (decr_pc != 0) | |
3282 | { | |
3283 | struct regcache *regcache | |
3284 | = get_thread_regcache (current_thread, 1); | |
3285 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3286 | } | |
3287 | } | |
3288 | ||
0bfdf32f | 3289 | if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3290 | && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
3291 | { |
3292 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3293 | and it stopped cleanly, so report as SIG0. The use of | |
3294 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3295 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3296 | } |
0bfdf32f | 3297 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3298 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3299 | { |
3300 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3301 | but, it stopped for other reasons. */ |
2ea28649 | 3302 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3303 | } |
de0d863e | 3304 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3305 | { |
2ea28649 | 3306 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3307 | } |
3308 | ||
d50171e4 PA |
3309 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3310 | ||
bd99dc85 | 3311 | if (debug_threads) |
87ce2a04 DE |
3312 | { |
3313 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3314 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3315 | ourstatus->kind, ourstatus->value.sig); |
3316 | debug_exit (); | |
3317 | } | |
bd99dc85 | 3318 | |
0bfdf32f | 3319 | return ptid_of (current_thread); |
bd99dc85 PA |
3320 | } |
3321 | ||
3322 | /* Get rid of any pending event in the pipe. */ | |
3323 | static void | |
3324 | async_file_flush (void) | |
3325 | { | |
3326 | int ret; | |
3327 | char buf; | |
3328 | ||
3329 | do | |
3330 | ret = read (linux_event_pipe[0], &buf, 1); | |
3331 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3332 | } | |
3333 | ||
3334 | /* Put something in the pipe, so the event loop wakes up. */ | |
3335 | static void | |
3336 | async_file_mark (void) | |
3337 | { | |
3338 | int ret; | |
3339 | ||
3340 | async_file_flush (); | |
3341 | ||
3342 | do | |
3343 | ret = write (linux_event_pipe[1], "+", 1); | |
3344 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3345 | ||
3346 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3347 | be awakened anyway. */ | |
3348 | } | |
3349 | ||
95954743 PA |
3350 | static ptid_t |
3351 | linux_wait (ptid_t ptid, | |
3352 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3353 | { |
95954743 | 3354 | ptid_t event_ptid; |
bd99dc85 | 3355 | |
bd99dc85 PA |
3356 | /* Flush the async file first. */ |
3357 | if (target_is_async_p ()) | |
3358 | async_file_flush (); | |
3359 | ||
582511be PA |
3360 | do |
3361 | { | |
3362 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3363 | } | |
3364 | while ((target_options & TARGET_WNOHANG) == 0 | |
3365 | && ptid_equal (event_ptid, null_ptid) | |
3366 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3367 | |
3368 | /* If at least one stop was reported, there may be more. A single | |
3369 | SIGCHLD can signal more than one child stop. */ | |
3370 | if (target_is_async_p () | |
3371 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3372 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3373 | async_file_mark (); |
3374 | ||
3375 | return event_ptid; | |
da6d8c04 DJ |
3376 | } |
3377 | ||
c5f62d5f | 3378 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3379 | |
3380 | static int | |
a1928bad | 3381 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3382 | { |
c5f62d5f DE |
3383 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3384 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3385 | |
c5f62d5f DE |
3386 | #ifdef __NR_tkill |
3387 | { | |
3388 | static int tkill_failed; | |
fd500816 | 3389 | |
c5f62d5f DE |
3390 | if (!tkill_failed) |
3391 | { | |
3392 | int ret; | |
3393 | ||
3394 | errno = 0; | |
3395 | ret = syscall (__NR_tkill, lwpid, signo); | |
3396 | if (errno != ENOSYS) | |
3397 | return ret; | |
3398 | tkill_failed = 1; | |
3399 | } | |
3400 | } | |
fd500816 DJ |
3401 | #endif |
3402 | ||
3403 | return kill (lwpid, signo); | |
3404 | } | |
3405 | ||
964e4306 PA |
3406 | void |
3407 | linux_stop_lwp (struct lwp_info *lwp) | |
3408 | { | |
3409 | send_sigstop (lwp); | |
3410 | } | |
3411 | ||
0d62e5e8 | 3412 | static void |
02fc4de7 | 3413 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3414 | { |
bd99dc85 | 3415 | int pid; |
0d62e5e8 | 3416 | |
d86d4aaf | 3417 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3418 | |
0d62e5e8 DJ |
3419 | /* If we already have a pending stop signal for this process, don't |
3420 | send another. */ | |
54a0b537 | 3421 | if (lwp->stop_expected) |
0d62e5e8 | 3422 | { |
ae13219e | 3423 | if (debug_threads) |
87ce2a04 | 3424 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3425 | |
0d62e5e8 DJ |
3426 | return; |
3427 | } | |
3428 | ||
3429 | if (debug_threads) | |
87ce2a04 | 3430 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3431 | |
d50171e4 | 3432 | lwp->stop_expected = 1; |
bd99dc85 | 3433 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3434 | } |
3435 | ||
7984d532 PA |
3436 | static int |
3437 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3438 | { |
d86d4aaf DE |
3439 | struct thread_info *thread = (struct thread_info *) entry; |
3440 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3441 | |
7984d532 PA |
3442 | /* Ignore EXCEPT. */ |
3443 | if (lwp == except) | |
3444 | return 0; | |
3445 | ||
02fc4de7 | 3446 | if (lwp->stopped) |
7984d532 | 3447 | return 0; |
02fc4de7 PA |
3448 | |
3449 | send_sigstop (lwp); | |
7984d532 PA |
3450 | return 0; |
3451 | } | |
3452 | ||
3453 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3454 | yet. */ | |
3455 | static int | |
3456 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3457 | void *except) | |
3458 | { | |
d86d4aaf DE |
3459 | struct thread_info *thread = (struct thread_info *) entry; |
3460 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3461 | |
3462 | /* Ignore EXCEPT. */ | |
3463 | if (lwp == except) | |
3464 | return 0; | |
3465 | ||
3466 | lwp->suspended++; | |
3467 | ||
3468 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3469 | } |
3470 | ||
95954743 PA |
3471 | static void |
3472 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3473 | { | |
95954743 PA |
3474 | /* Store the exit status for later. */ |
3475 | lwp->status_pending_p = 1; | |
3476 | lwp->status_pending = wstat; | |
3477 | ||
00db26fa PA |
3478 | /* Store in waitstatus as well, as there's nothing else to process |
3479 | for this event. */ | |
3480 | if (WIFEXITED (wstat)) | |
3481 | { | |
3482 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3483 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3484 | } | |
3485 | else if (WIFSIGNALED (wstat)) | |
3486 | { | |
3487 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3488 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3489 | } | |
3490 | ||
95954743 PA |
3491 | /* Prevent trying to stop it. */ |
3492 | lwp->stopped = 1; | |
3493 | ||
3494 | /* No further stops are expected from a dead lwp. */ | |
3495 | lwp->stop_expected = 0; | |
3496 | } | |
3497 | ||
00db26fa PA |
3498 | /* Return true if LWP has exited already, and has a pending exit event |
3499 | to report to GDB. */ | |
3500 | ||
3501 | static int | |
3502 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3503 | { | |
3504 | return (lwp->status_pending_p | |
3505 | && (WIFEXITED (lwp->status_pending) | |
3506 | || WIFSIGNALED (lwp->status_pending))); | |
3507 | } | |
3508 | ||
fa96cb38 PA |
3509 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3510 | ||
0d62e5e8 | 3511 | static void |
fa96cb38 | 3512 | wait_for_sigstop (void) |
0d62e5e8 | 3513 | { |
0bfdf32f | 3514 | struct thread_info *saved_thread; |
95954743 | 3515 | ptid_t saved_tid; |
fa96cb38 PA |
3516 | int wstat; |
3517 | int ret; | |
0d62e5e8 | 3518 | |
0bfdf32f GB |
3519 | saved_thread = current_thread; |
3520 | if (saved_thread != NULL) | |
3521 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3522 | else |
95954743 | 3523 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3524 | |
d50171e4 | 3525 | if (debug_threads) |
fa96cb38 | 3526 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3527 | |
fa96cb38 PA |
3528 | /* Passing NULL_PTID as filter indicates we want all events to be |
3529 | left pending. Eventually this returns when there are no | |
3530 | unwaited-for children left. */ | |
3531 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3532 | &wstat, __WALL); | |
3533 | gdb_assert (ret == -1); | |
0d62e5e8 | 3534 | |
0bfdf32f GB |
3535 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3536 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3537 | else |
3538 | { | |
3539 | if (debug_threads) | |
87ce2a04 | 3540 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3541 | |
bd99dc85 PA |
3542 | if (non_stop) |
3543 | { | |
3544 | /* We can't change the current inferior behind GDB's back, | |
3545 | otherwise, a subsequent command may apply to the wrong | |
3546 | process. */ | |
0bfdf32f | 3547 | current_thread = NULL; |
bd99dc85 PA |
3548 | } |
3549 | else | |
3550 | { | |
3551 | /* Set a valid thread as current. */ | |
0bfdf32f | 3552 | set_desired_thread (0); |
bd99dc85 | 3553 | } |
0d62e5e8 DJ |
3554 | } |
3555 | } | |
3556 | ||
fa593d66 PA |
3557 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3558 | move it out, because we need to report the stop event to GDB. For | |
3559 | example, if the user puts a breakpoint in the jump pad, it's | |
3560 | because she wants to debug it. */ | |
3561 | ||
3562 | static int | |
3563 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3564 | { | |
d86d4aaf DE |
3565 | struct thread_info *thread = (struct thread_info *) entry; |
3566 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3567 | |
3568 | gdb_assert (lwp->suspended == 0); | |
3569 | gdb_assert (lwp->stopped); | |
3570 | ||
3571 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3572 | return (supports_fast_tracepoints () | |
58b4daa5 | 3573 | && agent_loaded_p () |
fa593d66 | 3574 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3575 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3576 | || thread->last_resume_kind == resume_step) |
3577 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3578 | } | |
3579 | ||
3580 | static void | |
3581 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3582 | { | |
d86d4aaf DE |
3583 | struct thread_info *thread = (struct thread_info *) entry; |
3584 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3585 | int *wstat; |
3586 | ||
3587 | gdb_assert (lwp->suspended == 0); | |
3588 | gdb_assert (lwp->stopped); | |
3589 | ||
3590 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3591 | ||
3592 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3593 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3594 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3595 | && thread->last_resume_kind != resume_step |
3596 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3597 | { | |
3598 | if (debug_threads) | |
87ce2a04 | 3599 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3600 | lwpid_of (thread)); |
fa593d66 PA |
3601 | |
3602 | if (wstat) | |
3603 | { | |
3604 | lwp->status_pending_p = 0; | |
3605 | enqueue_one_deferred_signal (lwp, wstat); | |
3606 | ||
3607 | if (debug_threads) | |
87ce2a04 DE |
3608 | debug_printf ("Signal %d for LWP %ld deferred " |
3609 | "(in jump pad)\n", | |
d86d4aaf | 3610 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3611 | } |
3612 | ||
3613 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3614 | } | |
3615 | else | |
3616 | lwp->suspended++; | |
3617 | } | |
3618 | ||
3619 | static int | |
3620 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3621 | { | |
d86d4aaf DE |
3622 | struct thread_info *thread = (struct thread_info *) entry; |
3623 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 3624 | |
00db26fa | 3625 | if (lwp_is_marked_dead (lwp)) |
fa593d66 PA |
3626 | return 0; |
3627 | if (lwp->stopped) | |
3628 | return 0; | |
3629 | return 1; | |
3630 | } | |
3631 | ||
7984d532 PA |
3632 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3633 | If SUSPEND, then also increase the suspend count of every LWP, | |
3634 | except EXCEPT. */ | |
3635 | ||
0d62e5e8 | 3636 | static void |
7984d532 | 3637 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3638 | { |
bde24c0a PA |
3639 | /* Should not be called recursively. */ |
3640 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3641 | ||
87ce2a04 DE |
3642 | if (debug_threads) |
3643 | { | |
3644 | debug_enter (); | |
3645 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3646 | suspend ? "stop-and-suspend" : "stop", | |
3647 | except != NULL | |
d86d4aaf | 3648 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3649 | : "none"); |
3650 | } | |
3651 | ||
bde24c0a PA |
3652 | stopping_threads = (suspend |
3653 | ? STOPPING_AND_SUSPENDING_THREADS | |
3654 | : STOPPING_THREADS); | |
7984d532 PA |
3655 | |
3656 | if (suspend) | |
d86d4aaf | 3657 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3658 | else |
d86d4aaf | 3659 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3660 | wait_for_sigstop (); |
bde24c0a | 3661 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3662 | |
3663 | if (debug_threads) | |
3664 | { | |
3665 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3666 | "back to !stopping\n"); | |
3667 | debug_exit (); | |
3668 | } | |
0d62e5e8 DJ |
3669 | } |
3670 | ||
23f238d3 PA |
3671 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
3672 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 3673 | |
ce3a066d | 3674 | static void |
23f238d3 PA |
3675 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
3676 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 3677 | { |
d86d4aaf | 3678 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3679 | struct thread_info *saved_thread; |
fa593d66 | 3680 | int fast_tp_collecting; |
c06cbd92 YQ |
3681 | struct process_info *proc = get_thread_process (thread); |
3682 | ||
3683 | /* Note that target description may not be initialised | |
3684 | (proc->tdesc == NULL) at this point because the program hasn't | |
3685 | stopped at the first instruction yet. It means GDBserver skips | |
3686 | the extra traps from the wrapper program (see option --wrapper). | |
3687 | Code in this function that requires register access should be | |
3688 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 3689 | |
54a0b537 | 3690 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3691 | return; |
3692 | ||
fa593d66 PA |
3693 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3694 | ||
3695 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3696 | ||
219f2f23 PA |
3697 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3698 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 3699 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
3700 | { |
3701 | /* Collecting 'while-stepping' actions doesn't make sense | |
3702 | anymore. */ | |
d86d4aaf | 3703 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3704 | } |
3705 | ||
0d62e5e8 DJ |
3706 | /* If we have pending signals or status, and a new signal, enqueue the |
3707 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3708 | breakpoint; it will be picked up again below. */ | |
3709 | if (signal != 0 | |
fa593d66 PA |
3710 | && (lwp->status_pending_p |
3711 | || lwp->pending_signals != NULL | |
3712 | || lwp->bp_reinsert != 0 | |
3713 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3714 | { |
3715 | struct pending_signals *p_sig; | |
bca929d3 | 3716 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3717 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3718 | p_sig->signal = signal; |
32ca6d61 DJ |
3719 | if (info == NULL) |
3720 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3721 | else | |
3722 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3723 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3724 | } |
3725 | ||
d50171e4 PA |
3726 | if (lwp->status_pending_p) |
3727 | { | |
3728 | if (debug_threads) | |
87ce2a04 DE |
3729 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3730 | " has pending status\n", | |
d86d4aaf | 3731 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3732 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3733 | return; |
3734 | } | |
0d62e5e8 | 3735 | |
0bfdf32f GB |
3736 | saved_thread = current_thread; |
3737 | current_thread = thread; | |
0d62e5e8 DJ |
3738 | |
3739 | if (debug_threads) | |
87ce2a04 | 3740 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3741 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3742 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3743 | |
3744 | /* This bit needs some thinking about. If we get a signal that | |
3745 | we must report while a single-step reinsert is still pending, | |
3746 | we often end up resuming the thread. It might be better to | |
3747 | (ew) allow a stack of pending events; then we could be sure that | |
3748 | the reinsert happened right away and not lose any signals. | |
3749 | ||
3750 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3751 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3752 | complete correctness, so it won't solve that problem. It may be |
3753 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3754 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3755 | { |
3756 | if (debug_threads) | |
87ce2a04 DE |
3757 | debug_printf (" pending reinsert at 0x%s\n", |
3758 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3759 | |
85e00e85 | 3760 | if (can_hardware_single_step ()) |
d50171e4 | 3761 | { |
fa593d66 PA |
3762 | if (fast_tp_collecting == 0) |
3763 | { | |
3764 | if (step == 0) | |
3765 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3766 | if (lwp->suspended) | |
3767 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3768 | lwp->suspended); | |
3769 | } | |
d50171e4 PA |
3770 | |
3771 | step = 1; | |
3772 | } | |
0d62e5e8 DJ |
3773 | |
3774 | /* Postpone any pending signal. It was enqueued above. */ | |
3775 | signal = 0; | |
3776 | } | |
3777 | ||
fa593d66 PA |
3778 | if (fast_tp_collecting == 1) |
3779 | { | |
3780 | if (debug_threads) | |
87ce2a04 DE |
3781 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3782 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3783 | lwpid_of (thread)); |
fa593d66 PA |
3784 | |
3785 | /* Postpone any pending signal. It was enqueued above. */ | |
3786 | signal = 0; | |
3787 | } | |
3788 | else if (fast_tp_collecting == 2) | |
3789 | { | |
3790 | if (debug_threads) | |
87ce2a04 DE |
3791 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3792 | " single-stepping\n", | |
d86d4aaf | 3793 | lwpid_of (thread)); |
fa593d66 PA |
3794 | |
3795 | if (can_hardware_single_step ()) | |
3796 | step = 1; | |
3797 | else | |
38e08fca GB |
3798 | { |
3799 | internal_error (__FILE__, __LINE__, | |
3800 | "moving out of jump pad single-stepping" | |
3801 | " not implemented on this target"); | |
3802 | } | |
fa593d66 PA |
3803 | |
3804 | /* Postpone any pending signal. It was enqueued above. */ | |
3805 | signal = 0; | |
3806 | } | |
3807 | ||
219f2f23 PA |
3808 | /* If we have while-stepping actions in this thread set it stepping. |
3809 | If we have a signal to deliver, it may or may not be set to | |
3810 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3811 | while-stepping into a signal handler. A possible smart thing to | |
3812 | do would be to set an internal breakpoint at the signal return | |
3813 | address, continue, and carry on catching this while-stepping | |
3814 | action only when that breakpoint is hit. A future | |
3815 | enhancement. */ | |
d86d4aaf | 3816 | if (thread->while_stepping != NULL |
219f2f23 PA |
3817 | && can_hardware_single_step ()) |
3818 | { | |
3819 | if (debug_threads) | |
87ce2a04 | 3820 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 3821 | lwpid_of (thread)); |
219f2f23 PA |
3822 | step = 1; |
3823 | } | |
3824 | ||
c06cbd92 | 3825 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 3826 | { |
0bfdf32f | 3827 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
3828 | |
3829 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
3830 | ||
3831 | if (debug_threads) | |
3832 | { | |
3833 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
3834 | (long) lwp->stop_pc); | |
3835 | } | |
0d62e5e8 DJ |
3836 | } |
3837 | ||
fa593d66 PA |
3838 | /* If we have pending signals, consume one unless we are trying to |
3839 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3840 | collect. */ | |
3841 | if (lwp->pending_signals != NULL | |
3842 | && lwp->bp_reinsert == 0 | |
3843 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3844 | { |
3845 | struct pending_signals **p_sig; | |
3846 | ||
54a0b537 | 3847 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3848 | while ((*p_sig)->prev != NULL) |
3849 | p_sig = &(*p_sig)->prev; | |
3850 | ||
3851 | signal = (*p_sig)->signal; | |
32ca6d61 | 3852 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 3853 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3854 | &(*p_sig)->info); |
32ca6d61 | 3855 | |
0d62e5e8 DJ |
3856 | free (*p_sig); |
3857 | *p_sig = NULL; | |
3858 | } | |
3859 | ||
aa5ca48f DE |
3860 | if (the_low_target.prepare_to_resume != NULL) |
3861 | the_low_target.prepare_to_resume (lwp); | |
3862 | ||
d86d4aaf | 3863 | regcache_invalidate_thread (thread); |
da6d8c04 | 3864 | errno = 0; |
54a0b537 | 3865 | lwp->stepping = step; |
d86d4aaf | 3866 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 3867 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3868 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3869 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3870 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 3871 | |
0bfdf32f | 3872 | current_thread = saved_thread; |
da6d8c04 | 3873 | if (errno) |
23f238d3 PA |
3874 | perror_with_name ("resuming thread"); |
3875 | ||
3876 | /* Successfully resumed. Clear state that no longer makes sense, | |
3877 | and mark the LWP as running. Must not do this before resuming | |
3878 | otherwise if that fails other code will be confused. E.g., we'd | |
3879 | later try to stop the LWP and hang forever waiting for a stop | |
3880 | status. Note that we must not throw after this is cleared, | |
3881 | otherwise handle_zombie_lwp_error would get confused. */ | |
3882 | lwp->stopped = 0; | |
3883 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3884 | } | |
3885 | ||
3886 | /* Called when we try to resume a stopped LWP and that errors out. If | |
3887 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
3888 | or about to become), discard the error, clear any pending status | |
3889 | the LWP may have, and return true (we'll collect the exit status | |
3890 | soon enough). Otherwise, return false. */ | |
3891 | ||
3892 | static int | |
3893 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
3894 | { | |
3895 | struct thread_info *thread = get_lwp_thread (lp); | |
3896 | ||
3897 | /* If we get an error after resuming the LWP successfully, we'd | |
3898 | confuse !T state for the LWP being gone. */ | |
3899 | gdb_assert (lp->stopped); | |
3900 | ||
3901 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
3902 | because even if ptrace failed with ESRCH, the tracee may be "not | |
3903 | yet fully dead", but already refusing ptrace requests. In that | |
3904 | case the tracee has 'R (Running)' state for a little bit | |
3905 | (observed in Linux 3.18). See also the note on ESRCH in the | |
3906 | ptrace(2) man page. Instead, check whether the LWP has any state | |
3907 | other than ptrace-stopped. */ | |
3908 | ||
3909 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
3910 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 3911 | { |
23f238d3 PA |
3912 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
3913 | lp->status_pending_p = 0; | |
3914 | return 1; | |
3915 | } | |
3916 | return 0; | |
3917 | } | |
3918 | ||
3919 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
3920 | disappears while we try to resume it. */ | |
3221518c | 3921 | |
23f238d3 PA |
3922 | static void |
3923 | linux_resume_one_lwp (struct lwp_info *lwp, | |
3924 | int step, int signal, siginfo_t *info) | |
3925 | { | |
3926 | TRY | |
3927 | { | |
3928 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
3929 | } | |
3930 | CATCH (ex, RETURN_MASK_ERROR) | |
3931 | { | |
3932 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
3933 | throw_exception (ex); | |
3221518c | 3934 | } |
23f238d3 | 3935 | END_CATCH |
da6d8c04 DJ |
3936 | } |
3937 | ||
2bd7c093 PA |
3938 | struct thread_resume_array |
3939 | { | |
3940 | struct thread_resume *resume; | |
3941 | size_t n; | |
3942 | }; | |
64386c31 | 3943 | |
ebcf782c DE |
3944 | /* This function is called once per thread via find_inferior. |
3945 | ARG is a pointer to a thread_resume_array struct. | |
3946 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3947 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3948 | |
3949 | This algorithm is O(threads * resume elements), but resume elements | |
3950 | is small (and will remain small at least until GDB supports thread | |
3951 | suspension). */ | |
ebcf782c | 3952 | |
2bd7c093 PA |
3953 | static int |
3954 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3955 | { |
d86d4aaf DE |
3956 | struct thread_info *thread = (struct thread_info *) entry; |
3957 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3958 | int ndx; |
2bd7c093 | 3959 | struct thread_resume_array *r; |
64386c31 | 3960 | |
2bd7c093 | 3961 | r = arg; |
64386c31 | 3962 | |
2bd7c093 | 3963 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3964 | { |
3965 | ptid_t ptid = r->resume[ndx].thread; | |
3966 | if (ptid_equal (ptid, minus_one_ptid) | |
3967 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3968 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3969 | of PID'. */ | |
d86d4aaf | 3970 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
3971 | && (ptid_is_pid (ptid) |
3972 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3973 | { |
d50171e4 | 3974 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3975 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3976 | { |
3977 | if (debug_threads) | |
87ce2a04 DE |
3978 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3979 | (thread->last_status.kind | |
3980 | == TARGET_WAITKIND_STOPPED) | |
3981 | ? "stopped" | |
3982 | : "stopping", | |
d86d4aaf | 3983 | lwpid_of (thread)); |
d50171e4 PA |
3984 | |
3985 | continue; | |
3986 | } | |
3987 | ||
95954743 | 3988 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3989 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3990 | |
c2d6af84 PA |
3991 | lwp->step_range_start = lwp->resume->step_range_start; |
3992 | lwp->step_range_end = lwp->resume->step_range_end; | |
3993 | ||
fa593d66 PA |
3994 | /* If we had a deferred signal to report, dequeue one now. |
3995 | This can happen if LWP gets more than one signal while | |
3996 | trying to get out of a jump pad. */ | |
3997 | if (lwp->stopped | |
3998 | && !lwp->status_pending_p | |
3999 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4000 | { | |
4001 | lwp->status_pending_p = 1; | |
4002 | ||
4003 | if (debug_threads) | |
87ce2a04 DE |
4004 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4005 | "leaving status pending.\n", | |
d86d4aaf DE |
4006 | WSTOPSIG (lwp->status_pending), |
4007 | lwpid_of (thread)); | |
fa593d66 PA |
4008 | } |
4009 | ||
95954743 PA |
4010 | return 0; |
4011 | } | |
4012 | } | |
2bd7c093 PA |
4013 | |
4014 | /* No resume action for this thread. */ | |
4015 | lwp->resume = NULL; | |
64386c31 | 4016 | |
2bd7c093 | 4017 | return 0; |
5544ad89 DJ |
4018 | } |
4019 | ||
20ad9378 DE |
4020 | /* find_inferior callback for linux_resume. |
4021 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 4022 | |
bd99dc85 PA |
4023 | static int |
4024 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 4025 | { |
d86d4aaf DE |
4026 | struct thread_info *thread = (struct thread_info *) entry; |
4027 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4028 | |
bd99dc85 PA |
4029 | /* LWPs which will not be resumed are not interesting, because |
4030 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4031 | if (lwp->resume == NULL) |
bd99dc85 | 4032 | return 0; |
64386c31 | 4033 | |
582511be | 4034 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
4035 | * (int *) flag_p = 1; |
4036 | ||
4037 | return 0; | |
4038 | } | |
4039 | ||
4040 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4041 | internal breakpoint that we need to step over. It assumes that any | |
4042 | required STOP_PC adjustment has already been propagated to the | |
4043 | inferior's regcache. */ | |
4044 | ||
4045 | static int | |
4046 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
4047 | { | |
d86d4aaf DE |
4048 | struct thread_info *thread = (struct thread_info *) entry; |
4049 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 4050 | struct thread_info *saved_thread; |
d50171e4 | 4051 | CORE_ADDR pc; |
c06cbd92 YQ |
4052 | struct process_info *proc = get_thread_process (thread); |
4053 | ||
4054 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4055 | don't have to do step over. */ | |
4056 | if (proc->tdesc == NULL) | |
4057 | return 0; | |
d50171e4 PA |
4058 | |
4059 | /* LWPs which will not be resumed are not interesting, because we | |
4060 | might not wait for them next time through linux_wait. */ | |
4061 | ||
4062 | if (!lwp->stopped) | |
4063 | { | |
4064 | if (debug_threads) | |
87ce2a04 | 4065 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4066 | lwpid_of (thread)); |
d50171e4 PA |
4067 | return 0; |
4068 | } | |
4069 | ||
8336d594 | 4070 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4071 | { |
4072 | if (debug_threads) | |
87ce2a04 DE |
4073 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4074 | " stopped\n", | |
d86d4aaf | 4075 | lwpid_of (thread)); |
d50171e4 PA |
4076 | return 0; |
4077 | } | |
4078 | ||
7984d532 PA |
4079 | gdb_assert (lwp->suspended >= 0); |
4080 | ||
4081 | if (lwp->suspended) | |
4082 | { | |
4083 | if (debug_threads) | |
87ce2a04 | 4084 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4085 | lwpid_of (thread)); |
7984d532 PA |
4086 | return 0; |
4087 | } | |
4088 | ||
d50171e4 PA |
4089 | if (!lwp->need_step_over) |
4090 | { | |
4091 | if (debug_threads) | |
d86d4aaf | 4092 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 4093 | } |
5544ad89 | 4094 | |
bd99dc85 | 4095 | if (lwp->status_pending_p) |
d50171e4 PA |
4096 | { |
4097 | if (debug_threads) | |
87ce2a04 DE |
4098 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4099 | " status.\n", | |
d86d4aaf | 4100 | lwpid_of (thread)); |
d50171e4 PA |
4101 | return 0; |
4102 | } | |
4103 | ||
4104 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4105 | or we have. */ | |
4106 | pc = get_pc (lwp); | |
4107 | ||
4108 | /* If the PC has changed since we stopped, then don't do anything, | |
4109 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4110 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4111 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4112 | command, or poked thread's registers herself. */ | |
4113 | if (pc != lwp->stop_pc) | |
4114 | { | |
4115 | if (debug_threads) | |
87ce2a04 DE |
4116 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4117 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4118 | lwpid_of (thread), |
4119 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
4120 | |
4121 | lwp->need_step_over = 0; | |
4122 | return 0; | |
4123 | } | |
4124 | ||
0bfdf32f GB |
4125 | saved_thread = current_thread; |
4126 | current_thread = thread; | |
d50171e4 | 4127 | |
8b07ae33 | 4128 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4129 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4130 | { |
8b07ae33 | 4131 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4132 | though. If the condition is being evaluated on the target's side |
4133 | and it evaluate to false, step over this breakpoint as well. */ | |
4134 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4135 | && gdb_condition_true_at_breakpoint (pc) |
4136 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4137 | { |
4138 | if (debug_threads) | |
87ce2a04 DE |
4139 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4140 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4141 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4142 | |
0bfdf32f | 4143 | current_thread = saved_thread; |
8b07ae33 PA |
4144 | return 0; |
4145 | } | |
4146 | else | |
4147 | { | |
4148 | if (debug_threads) | |
87ce2a04 DE |
4149 | debug_printf ("Need step over [LWP %ld]? yes, " |
4150 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4151 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4152 | |
8b07ae33 PA |
4153 | /* We've found an lwp that needs stepping over --- return 1 so |
4154 | that find_inferior stops looking. */ | |
0bfdf32f | 4155 | current_thread = saved_thread; |
8b07ae33 PA |
4156 | |
4157 | /* If the step over is cancelled, this is set again. */ | |
4158 | lwp->need_step_over = 0; | |
4159 | return 1; | |
4160 | } | |
d50171e4 PA |
4161 | } |
4162 | ||
0bfdf32f | 4163 | current_thread = saved_thread; |
d50171e4 PA |
4164 | |
4165 | if (debug_threads) | |
87ce2a04 DE |
4166 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4167 | " at 0x%s\n", | |
d86d4aaf | 4168 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4169 | |
bd99dc85 | 4170 | return 0; |
5544ad89 DJ |
4171 | } |
4172 | ||
d50171e4 PA |
4173 | /* Start a step-over operation on LWP. When LWP stopped at a |
4174 | breakpoint, to make progress, we need to remove the breakpoint out | |
4175 | of the way. If we let other threads run while we do that, they may | |
4176 | pass by the breakpoint location and miss hitting it. To avoid | |
4177 | that, a step-over momentarily stops all threads while LWP is | |
4178 | single-stepped while the breakpoint is temporarily uninserted from | |
4179 | the inferior. When the single-step finishes, we reinsert the | |
4180 | breakpoint, and let all threads that are supposed to be running, | |
4181 | run again. | |
4182 | ||
4183 | On targets that don't support hardware single-step, we don't | |
4184 | currently support full software single-stepping. Instead, we only | |
4185 | support stepping over the thread event breakpoint, by asking the | |
4186 | low target where to place a reinsert breakpoint. Since this | |
4187 | routine assumes the breakpoint being stepped over is a thread event | |
4188 | breakpoint, it usually assumes the return address of the current | |
4189 | function is a good enough place to set the reinsert breakpoint. */ | |
4190 | ||
4191 | static int | |
4192 | start_step_over (struct lwp_info *lwp) | |
4193 | { | |
d86d4aaf | 4194 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4195 | struct thread_info *saved_thread; |
d50171e4 PA |
4196 | CORE_ADDR pc; |
4197 | int step; | |
4198 | ||
4199 | if (debug_threads) | |
87ce2a04 | 4200 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4201 | lwpid_of (thread)); |
d50171e4 | 4202 | |
7984d532 PA |
4203 | stop_all_lwps (1, lwp); |
4204 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
4205 | |
4206 | if (debug_threads) | |
87ce2a04 | 4207 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4208 | |
4209 | /* Note, we should always reach here with an already adjusted PC, | |
4210 | either by GDB (if we're resuming due to GDB's request), or by our | |
4211 | caller, if we just finished handling an internal breakpoint GDB | |
4212 | shouldn't care about. */ | |
4213 | pc = get_pc (lwp); | |
4214 | ||
0bfdf32f GB |
4215 | saved_thread = current_thread; |
4216 | current_thread = thread; | |
d50171e4 PA |
4217 | |
4218 | lwp->bp_reinsert = pc; | |
4219 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4220 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
4221 | |
4222 | if (can_hardware_single_step ()) | |
4223 | { | |
4224 | step = 1; | |
4225 | } | |
4226 | else | |
4227 | { | |
4228 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
4229 | set_reinsert_breakpoint (raddr); | |
4230 | step = 0; | |
4231 | } | |
4232 | ||
0bfdf32f | 4233 | current_thread = saved_thread; |
d50171e4 PA |
4234 | |
4235 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4236 | ||
4237 | /* Require next event from this LWP. */ | |
d86d4aaf | 4238 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
4239 | return 1; |
4240 | } | |
4241 | ||
4242 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
4243 | start_step_over, if still there, and delete any reinsert | |
4244 | breakpoints we've set, on non hardware single-step targets. */ | |
4245 | ||
4246 | static int | |
4247 | finish_step_over (struct lwp_info *lwp) | |
4248 | { | |
4249 | if (lwp->bp_reinsert != 0) | |
4250 | { | |
4251 | if (debug_threads) | |
87ce2a04 | 4252 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
4253 | |
4254 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
4255 | may be no breakpoint to reinsert there by now. */ | |
4256 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4257 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4258 | |
4259 | lwp->bp_reinsert = 0; | |
4260 | ||
4261 | /* Delete any software-single-step reinsert breakpoints. No | |
4262 | longer needed. We don't have to worry about other threads | |
4263 | hitting this trap, and later not being able to explain it, | |
4264 | because we were stepping over a breakpoint, and we hold all | |
4265 | threads but LWP stopped while doing that. */ | |
4266 | if (!can_hardware_single_step ()) | |
4267 | delete_reinsert_breakpoints (); | |
4268 | ||
4269 | step_over_bkpt = null_ptid; | |
4270 | return 1; | |
4271 | } | |
4272 | else | |
4273 | return 0; | |
4274 | } | |
4275 | ||
5544ad89 DJ |
4276 | /* This function is called once per thread. We check the thread's resume |
4277 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 4278 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 4279 | |
bd99dc85 PA |
4280 | For threads which we aren't explicitly told otherwise, we preserve |
4281 | the stepping flag; this is used for stepping over gdbserver-placed | |
4282 | breakpoints. | |
4283 | ||
4284 | If pending_flags was set in any thread, we queue any needed | |
4285 | signals, since we won't actually resume. We already have a pending | |
4286 | event to report, so we don't need to preserve any step requests; | |
4287 | they should be re-issued if necessary. */ | |
4288 | ||
4289 | static int | |
4290 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 4291 | { |
d86d4aaf DE |
4292 | struct thread_info *thread = (struct thread_info *) entry; |
4293 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 4294 | int step; |
d50171e4 PA |
4295 | int leave_all_stopped = * (int *) arg; |
4296 | int leave_pending; | |
5544ad89 | 4297 | |
2bd7c093 | 4298 | if (lwp->resume == NULL) |
bd99dc85 | 4299 | return 0; |
5544ad89 | 4300 | |
bd99dc85 | 4301 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4302 | { |
bd99dc85 | 4303 | if (debug_threads) |
d86d4aaf | 4304 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4305 | |
4306 | if (!lwp->stopped) | |
4307 | { | |
4308 | if (debug_threads) | |
d86d4aaf | 4309 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4310 | |
d50171e4 PA |
4311 | /* Stop the thread, and wait for the event asynchronously, |
4312 | through the event loop. */ | |
02fc4de7 | 4313 | send_sigstop (lwp); |
bd99dc85 PA |
4314 | } |
4315 | else | |
4316 | { | |
4317 | if (debug_threads) | |
87ce2a04 | 4318 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4319 | lwpid_of (thread)); |
d50171e4 PA |
4320 | |
4321 | /* The LWP may have been stopped in an internal event that | |
4322 | was not meant to be notified back to GDB (e.g., gdbserver | |
4323 | breakpoint), so we should be reporting a stop event in | |
4324 | this case too. */ | |
4325 | ||
4326 | /* If the thread already has a pending SIGSTOP, this is a | |
4327 | no-op. Otherwise, something later will presumably resume | |
4328 | the thread and this will cause it to cancel any pending | |
4329 | operation, due to last_resume_kind == resume_stop. If | |
4330 | the thread already has a pending status to report, we | |
4331 | will still report it the next time we wait - see | |
4332 | status_pending_p_callback. */ | |
1a981360 PA |
4333 | |
4334 | /* If we already have a pending signal to report, then | |
4335 | there's no need to queue a SIGSTOP, as this means we're | |
4336 | midway through moving the LWP out of the jumppad, and we | |
4337 | will report the pending signal as soon as that is | |
4338 | finished. */ | |
4339 | if (lwp->pending_signals_to_report == NULL) | |
4340 | send_sigstop (lwp); | |
bd99dc85 | 4341 | } |
32ca6d61 | 4342 | |
bd99dc85 PA |
4343 | /* For stop requests, we're done. */ |
4344 | lwp->resume = NULL; | |
fc7238bb | 4345 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4346 | return 0; |
5544ad89 DJ |
4347 | } |
4348 | ||
bd99dc85 PA |
4349 | /* If this thread which is about to be resumed has a pending status, |
4350 | then don't resume any threads - we can just report the pending | |
4351 | status. Make sure to queue any signals that would otherwise be | |
4352 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
4353 | thread has a pending status. If there's a thread that needs the |
4354 | step-over-breakpoint dance, then don't resume any other thread | |
4355 | but that particular one. */ | |
4356 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 4357 | |
d50171e4 | 4358 | if (!leave_pending) |
bd99dc85 PA |
4359 | { |
4360 | if (debug_threads) | |
d86d4aaf | 4361 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4362 | |
d50171e4 | 4363 | step = (lwp->resume->kind == resume_step); |
2acc282a | 4364 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
4365 | } |
4366 | else | |
4367 | { | |
4368 | if (debug_threads) | |
d86d4aaf | 4369 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 4370 | |
bd99dc85 PA |
4371 | /* If we have a new signal, enqueue the signal. */ |
4372 | if (lwp->resume->sig != 0) | |
4373 | { | |
4374 | struct pending_signals *p_sig; | |
4375 | p_sig = xmalloc (sizeof (*p_sig)); | |
4376 | p_sig->prev = lwp->pending_signals; | |
4377 | p_sig->signal = lwp->resume->sig; | |
4378 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4379 | ||
4380 | /* If this is the same signal we were previously stopped by, | |
4381 | make sure to queue its siginfo. We can ignore the return | |
4382 | value of ptrace; if it fails, we'll skip | |
4383 | PTRACE_SETSIGINFO. */ | |
4384 | if (WIFSTOPPED (lwp->last_status) | |
4385 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 4386 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4387 | &p_sig->info); |
bd99dc85 PA |
4388 | |
4389 | lwp->pending_signals = p_sig; | |
4390 | } | |
4391 | } | |
5544ad89 | 4392 | |
fc7238bb | 4393 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4394 | lwp->resume = NULL; |
5544ad89 | 4395 | return 0; |
0d62e5e8 DJ |
4396 | } |
4397 | ||
4398 | static void | |
2bd7c093 | 4399 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 4400 | { |
2bd7c093 | 4401 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 4402 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
4403 | int any_pending; |
4404 | int leave_all_stopped; | |
c6ecbae5 | 4405 | |
87ce2a04 DE |
4406 | if (debug_threads) |
4407 | { | |
4408 | debug_enter (); | |
4409 | debug_printf ("linux_resume:\n"); | |
4410 | } | |
4411 | ||
2bd7c093 | 4412 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 4413 | |
d50171e4 PA |
4414 | /* If there is a thread which would otherwise be resumed, which has |
4415 | a pending status, then don't resume any threads - we can just | |
4416 | report the pending status. Make sure to queue any signals that | |
4417 | would otherwise be sent. In non-stop mode, we'll apply this | |
4418 | logic to each thread individually. We consume all pending events | |
4419 | before considering to start a step-over (in all-stop). */ | |
4420 | any_pending = 0; | |
bd99dc85 | 4421 | if (!non_stop) |
d86d4aaf | 4422 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
4423 | |
4424 | /* If there is a thread which would otherwise be resumed, which is | |
4425 | stopped at a breakpoint that needs stepping over, then don't | |
4426 | resume any threads - have it step over the breakpoint with all | |
4427 | other threads stopped, then resume all threads again. Make sure | |
4428 | to queue any signals that would otherwise be delivered or | |
4429 | queued. */ | |
4430 | if (!any_pending && supports_breakpoints ()) | |
4431 | need_step_over | |
d86d4aaf DE |
4432 | = (struct thread_info *) find_inferior (&all_threads, |
4433 | need_step_over_p, NULL); | |
d50171e4 PA |
4434 | |
4435 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4436 | ||
4437 | if (debug_threads) | |
4438 | { | |
4439 | if (need_step_over != NULL) | |
87ce2a04 | 4440 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4441 | else if (any_pending) |
87ce2a04 DE |
4442 | debug_printf ("Not resuming, all-stop and found " |
4443 | "an LWP with pending status\n"); | |
d50171e4 | 4444 | else |
87ce2a04 | 4445 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4446 | } |
4447 | ||
4448 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4449 | otherwise deliver. */ | |
4450 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4451 | ||
4452 | if (need_step_over) | |
d86d4aaf | 4453 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4454 | |
4455 | if (debug_threads) | |
4456 | { | |
4457 | debug_printf ("linux_resume done\n"); | |
4458 | debug_exit (); | |
4459 | } | |
d50171e4 PA |
4460 | } |
4461 | ||
4462 | /* This function is called once per thread. We check the thread's | |
4463 | last resume request, which will tell us whether to resume, step, or | |
4464 | leave the thread stopped. Any signal the client requested to be | |
4465 | delivered has already been enqueued at this point. | |
4466 | ||
4467 | If any thread that GDB wants running is stopped at an internal | |
4468 | breakpoint that needs stepping over, we start a step-over operation | |
4469 | on that particular thread, and leave all others stopped. */ | |
4470 | ||
7984d532 PA |
4471 | static int |
4472 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4473 | { |
d86d4aaf DE |
4474 | struct thread_info *thread = (struct thread_info *) entry; |
4475 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4476 | int step; |
4477 | ||
7984d532 PA |
4478 | if (lwp == except) |
4479 | return 0; | |
d50171e4 PA |
4480 | |
4481 | if (debug_threads) | |
d86d4aaf | 4482 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4483 | |
4484 | if (!lwp->stopped) | |
4485 | { | |
4486 | if (debug_threads) | |
d86d4aaf | 4487 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4488 | return 0; |
d50171e4 PA |
4489 | } |
4490 | ||
02fc4de7 PA |
4491 | if (thread->last_resume_kind == resume_stop |
4492 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4493 | { |
4494 | if (debug_threads) | |
87ce2a04 | 4495 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4496 | lwpid_of (thread)); |
7984d532 | 4497 | return 0; |
d50171e4 PA |
4498 | } |
4499 | ||
4500 | if (lwp->status_pending_p) | |
4501 | { | |
4502 | if (debug_threads) | |
87ce2a04 | 4503 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4504 | lwpid_of (thread)); |
7984d532 | 4505 | return 0; |
d50171e4 PA |
4506 | } |
4507 | ||
7984d532 PA |
4508 | gdb_assert (lwp->suspended >= 0); |
4509 | ||
d50171e4 PA |
4510 | if (lwp->suspended) |
4511 | { | |
4512 | if (debug_threads) | |
d86d4aaf | 4513 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4514 | return 0; |
d50171e4 PA |
4515 | } |
4516 | ||
1a981360 PA |
4517 | if (thread->last_resume_kind == resume_stop |
4518 | && lwp->pending_signals_to_report == NULL | |
4519 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4520 | { |
4521 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4522 | last_status.kind check above would catch it, and we wouldn't | |
4523 | reach here. This LWP may have been momentarily paused by a | |
4524 | stop_all_lwps call while handling for example, another LWP's | |
4525 | step-over. In that case, the pending expected SIGSTOP signal | |
4526 | that was queued at vCont;t handling time will have already | |
4527 | been consumed by wait_for_sigstop, and so we need to requeue | |
4528 | another one here. Note that if the LWP already has a SIGSTOP | |
4529 | pending, this is a no-op. */ | |
4530 | ||
4531 | if (debug_threads) | |
87ce2a04 DE |
4532 | debug_printf ("Client wants LWP %ld to stop. " |
4533 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4534 | lwpid_of (thread)); |
02fc4de7 PA |
4535 | |
4536 | send_sigstop (lwp); | |
4537 | } | |
4538 | ||
8336d594 | 4539 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 4540 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4541 | return 0; |
4542 | } | |
4543 | ||
4544 | static int | |
4545 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4546 | { | |
d86d4aaf DE |
4547 | struct thread_info *thread = (struct thread_info *) entry; |
4548 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4549 | |
4550 | if (lwp == except) | |
4551 | return 0; | |
4552 | ||
4553 | lwp->suspended--; | |
4554 | gdb_assert (lwp->suspended >= 0); | |
4555 | ||
4556 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4557 | } |
4558 | ||
4559 | /* When we finish a step-over, set threads running again. If there's | |
4560 | another thread that may need a step-over, now's the time to start | |
4561 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4562 | ||
4563 | static void | |
4564 | proceed_all_lwps (void) | |
4565 | { | |
d86d4aaf | 4566 | struct thread_info *need_step_over; |
d50171e4 PA |
4567 | |
4568 | /* If there is a thread which would otherwise be resumed, which is | |
4569 | stopped at a breakpoint that needs stepping over, then don't | |
4570 | resume any threads - have it step over the breakpoint with all | |
4571 | other threads stopped, then resume all threads again. */ | |
4572 | ||
4573 | if (supports_breakpoints ()) | |
4574 | { | |
4575 | need_step_over | |
d86d4aaf DE |
4576 | = (struct thread_info *) find_inferior (&all_threads, |
4577 | need_step_over_p, NULL); | |
d50171e4 PA |
4578 | |
4579 | if (need_step_over != NULL) | |
4580 | { | |
4581 | if (debug_threads) | |
87ce2a04 DE |
4582 | debug_printf ("proceed_all_lwps: found " |
4583 | "thread %ld needing a step-over\n", | |
4584 | lwpid_of (need_step_over)); | |
d50171e4 | 4585 | |
d86d4aaf | 4586 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4587 | return; |
4588 | } | |
4589 | } | |
5544ad89 | 4590 | |
d50171e4 | 4591 | if (debug_threads) |
87ce2a04 | 4592 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4593 | |
d86d4aaf | 4594 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4595 | } |
4596 | ||
4597 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4598 | pending statuses, are set to run again, except for EXCEPT, if not | |
4599 | NULL. This undoes a stop_all_lwps call. */ | |
4600 | ||
4601 | static void | |
7984d532 | 4602 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4603 | { |
5544ad89 DJ |
4604 | if (debug_threads) |
4605 | { | |
87ce2a04 | 4606 | debug_enter (); |
d50171e4 | 4607 | if (except) |
87ce2a04 | 4608 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4609 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4610 | else |
87ce2a04 | 4611 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4612 | } |
4613 | ||
7984d532 | 4614 | if (unsuspend) |
d86d4aaf | 4615 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4616 | else |
d86d4aaf | 4617 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4618 | |
4619 | if (debug_threads) | |
4620 | { | |
4621 | debug_printf ("unstop_all_lwps done\n"); | |
4622 | debug_exit (); | |
4623 | } | |
0d62e5e8 DJ |
4624 | } |
4625 | ||
58caa3dc DJ |
4626 | |
4627 | #ifdef HAVE_LINUX_REGSETS | |
4628 | ||
1faeff08 MR |
4629 | #define use_linux_regsets 1 |
4630 | ||
030031ee PA |
4631 | /* Returns true if REGSET has been disabled. */ |
4632 | ||
4633 | static int | |
4634 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4635 | { | |
4636 | return (info->disabled_regsets != NULL | |
4637 | && info->disabled_regsets[regset - info->regsets]); | |
4638 | } | |
4639 | ||
4640 | /* Disable REGSET. */ | |
4641 | ||
4642 | static void | |
4643 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4644 | { | |
4645 | int dr_offset; | |
4646 | ||
4647 | dr_offset = regset - info->regsets; | |
4648 | if (info->disabled_regsets == NULL) | |
4649 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4650 | info->disabled_regsets[dr_offset] = 1; | |
4651 | } | |
4652 | ||
58caa3dc | 4653 | static int |
3aee8918 PA |
4654 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4655 | struct regcache *regcache) | |
58caa3dc DJ |
4656 | { |
4657 | struct regset_info *regset; | |
e9d25b98 | 4658 | int saw_general_regs = 0; |
95954743 | 4659 | int pid; |
1570b33e | 4660 | struct iovec iov; |
58caa3dc | 4661 | |
0bfdf32f | 4662 | pid = lwpid_of (current_thread); |
28eef672 | 4663 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4664 | { |
1570b33e L |
4665 | void *buf, *data; |
4666 | int nt_type, res; | |
58caa3dc | 4667 | |
030031ee | 4668 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4669 | continue; |
58caa3dc | 4670 | |
bca929d3 | 4671 | buf = xmalloc (regset->size); |
1570b33e L |
4672 | |
4673 | nt_type = regset->nt_type; | |
4674 | if (nt_type) | |
4675 | { | |
4676 | iov.iov_base = buf; | |
4677 | iov.iov_len = regset->size; | |
4678 | data = (void *) &iov; | |
4679 | } | |
4680 | else | |
4681 | data = buf; | |
4682 | ||
dfb64f85 | 4683 | #ifndef __sparc__ |
f15f9948 | 4684 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4685 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4686 | #else |
1570b33e | 4687 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4688 | #endif |
58caa3dc DJ |
4689 | if (res < 0) |
4690 | { | |
4691 | if (errno == EIO) | |
4692 | { | |
52fa2412 | 4693 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4694 | this process mode. */ |
030031ee | 4695 | disable_regset (regsets_info, regset); |
58caa3dc | 4696 | } |
e5a9158d AA |
4697 | else if (errno == ENODATA) |
4698 | { | |
4699 | /* ENODATA may be returned if the regset is currently | |
4700 | not "active". This can happen in normal operation, | |
4701 | so suppress the warning in this case. */ | |
4702 | } | |
58caa3dc DJ |
4703 | else |
4704 | { | |
0d62e5e8 | 4705 | char s[256]; |
95954743 PA |
4706 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4707 | pid); | |
0d62e5e8 | 4708 | perror (s); |
58caa3dc DJ |
4709 | } |
4710 | } | |
098dbe61 AA |
4711 | else |
4712 | { | |
4713 | if (regset->type == GENERAL_REGS) | |
4714 | saw_general_regs = 1; | |
4715 | regset->store_function (regcache, buf); | |
4716 | } | |
fdeb2a12 | 4717 | free (buf); |
58caa3dc | 4718 | } |
e9d25b98 DJ |
4719 | if (saw_general_regs) |
4720 | return 0; | |
4721 | else | |
4722 | return 1; | |
58caa3dc DJ |
4723 | } |
4724 | ||
4725 | static int | |
3aee8918 PA |
4726 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4727 | struct regcache *regcache) | |
58caa3dc DJ |
4728 | { |
4729 | struct regset_info *regset; | |
e9d25b98 | 4730 | int saw_general_regs = 0; |
95954743 | 4731 | int pid; |
1570b33e | 4732 | struct iovec iov; |
58caa3dc | 4733 | |
0bfdf32f | 4734 | pid = lwpid_of (current_thread); |
28eef672 | 4735 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4736 | { |
1570b33e L |
4737 | void *buf, *data; |
4738 | int nt_type, res; | |
58caa3dc | 4739 | |
feea5f36 AA |
4740 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
4741 | || regset->fill_function == NULL) | |
28eef672 | 4742 | continue; |
58caa3dc | 4743 | |
bca929d3 | 4744 | buf = xmalloc (regset->size); |
545587ee DJ |
4745 | |
4746 | /* First fill the buffer with the current register set contents, | |
4747 | in case there are any items in the kernel's regset that are | |
4748 | not in gdbserver's regcache. */ | |
1570b33e L |
4749 | |
4750 | nt_type = regset->nt_type; | |
4751 | if (nt_type) | |
4752 | { | |
4753 | iov.iov_base = buf; | |
4754 | iov.iov_len = regset->size; | |
4755 | data = (void *) &iov; | |
4756 | } | |
4757 | else | |
4758 | data = buf; | |
4759 | ||
dfb64f85 | 4760 | #ifndef __sparc__ |
f15f9948 | 4761 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4762 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4763 | #else |
689cc2ae | 4764 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4765 | #endif |
545587ee DJ |
4766 | |
4767 | if (res == 0) | |
4768 | { | |
4769 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4770 | regset->fill_function (regcache, buf); |
545587ee DJ |
4771 | |
4772 | /* Only now do we write the register set. */ | |
dfb64f85 | 4773 | #ifndef __sparc__ |
f15f9948 | 4774 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4775 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4776 | #else |
1570b33e | 4777 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4778 | #endif |
545587ee DJ |
4779 | } |
4780 | ||
58caa3dc DJ |
4781 | if (res < 0) |
4782 | { | |
4783 | if (errno == EIO) | |
4784 | { | |
52fa2412 | 4785 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4786 | this process mode. */ |
030031ee | 4787 | disable_regset (regsets_info, regset); |
58caa3dc | 4788 | } |
3221518c UW |
4789 | else if (errno == ESRCH) |
4790 | { | |
1b3f6016 PA |
4791 | /* At this point, ESRCH should mean the process is |
4792 | already gone, in which case we simply ignore attempts | |
4793 | to change its registers. See also the related | |
4794 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4795 | free (buf); |
3221518c UW |
4796 | return 0; |
4797 | } | |
58caa3dc DJ |
4798 | else |
4799 | { | |
ce3a066d | 4800 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4801 | } |
4802 | } | |
e9d25b98 DJ |
4803 | else if (regset->type == GENERAL_REGS) |
4804 | saw_general_regs = 1; | |
09ec9b38 | 4805 | free (buf); |
58caa3dc | 4806 | } |
e9d25b98 DJ |
4807 | if (saw_general_regs) |
4808 | return 0; | |
4809 | else | |
4810 | return 1; | |
58caa3dc DJ |
4811 | } |
4812 | ||
1faeff08 | 4813 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4814 | |
1faeff08 | 4815 | #define use_linux_regsets 0 |
3aee8918 PA |
4816 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4817 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4818 | |
58caa3dc | 4819 | #endif |
1faeff08 MR |
4820 | |
4821 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4822 | calls or 0 if it has to be transferred individually. */ | |
4823 | ||
4824 | static int | |
3aee8918 | 4825 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4826 | { |
4827 | unsigned char mask = 1 << (regno % 8); | |
4828 | size_t index = regno / 8; | |
4829 | ||
4830 | return (use_linux_regsets | |
3aee8918 PA |
4831 | && (regs_info->regset_bitmap == NULL |
4832 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4833 | } |
4834 | ||
58caa3dc | 4835 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4836 | |
4837 | int | |
3aee8918 | 4838 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4839 | { |
4840 | int addr; | |
4841 | ||
3aee8918 | 4842 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4843 | error ("Invalid register number %d.", regnum); |
4844 | ||
3aee8918 | 4845 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4846 | |
4847 | return addr; | |
4848 | } | |
4849 | ||
4850 | /* Fetch one register. */ | |
4851 | static void | |
3aee8918 PA |
4852 | fetch_register (const struct usrregs_info *usrregs, |
4853 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4854 | { |
4855 | CORE_ADDR regaddr; | |
4856 | int i, size; | |
4857 | char *buf; | |
4858 | int pid; | |
4859 | ||
3aee8918 | 4860 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4861 | return; |
4862 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4863 | return; | |
4864 | ||
3aee8918 | 4865 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4866 | if (regaddr == -1) |
4867 | return; | |
4868 | ||
3aee8918 PA |
4869 | size = ((register_size (regcache->tdesc, regno) |
4870 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4871 | & -sizeof (PTRACE_XFER_TYPE)); |
4872 | buf = alloca (size); | |
4873 | ||
0bfdf32f | 4874 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4875 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4876 | { | |
4877 | errno = 0; | |
4878 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4879 | ptrace (PTRACE_PEEKUSER, pid, | |
4880 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4881 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4882 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4883 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4884 | if (errno != 0) | |
4885 | error ("reading register %d: %s", regno, strerror (errno)); | |
4886 | } | |
4887 | ||
4888 | if (the_low_target.supply_ptrace_register) | |
4889 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4890 | else | |
4891 | supply_register (regcache, regno, buf); | |
4892 | } | |
4893 | ||
4894 | /* Store one register. */ | |
4895 | static void | |
3aee8918 PA |
4896 | store_register (const struct usrregs_info *usrregs, |
4897 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4898 | { |
4899 | CORE_ADDR regaddr; | |
4900 | int i, size; | |
4901 | char *buf; | |
4902 | int pid; | |
4903 | ||
3aee8918 | 4904 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4905 | return; |
4906 | if ((*the_low_target.cannot_store_register) (regno)) | |
4907 | return; | |
4908 | ||
3aee8918 | 4909 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4910 | if (regaddr == -1) |
4911 | return; | |
4912 | ||
3aee8918 PA |
4913 | size = ((register_size (regcache->tdesc, regno) |
4914 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4915 | & -sizeof (PTRACE_XFER_TYPE)); |
4916 | buf = alloca (size); | |
4917 | memset (buf, 0, size); | |
4918 | ||
4919 | if (the_low_target.collect_ptrace_register) | |
4920 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4921 | else | |
4922 | collect_register (regcache, regno, buf); | |
4923 | ||
0bfdf32f | 4924 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4925 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4926 | { | |
4927 | errno = 0; | |
4928 | ptrace (PTRACE_POKEUSER, pid, | |
4929 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4930 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4931 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4932 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4933 | if (errno != 0) |
4934 | { | |
4935 | /* At this point, ESRCH should mean the process is | |
4936 | already gone, in which case we simply ignore attempts | |
4937 | to change its registers. See also the related | |
4938 | comment in linux_resume_one_lwp. */ | |
4939 | if (errno == ESRCH) | |
4940 | return; | |
4941 | ||
4942 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4943 | error ("writing register %d: %s", regno, strerror (errno)); | |
4944 | } | |
4945 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4946 | } | |
4947 | } | |
4948 | ||
4949 | /* Fetch all registers, or just one, from the child process. | |
4950 | If REGNO is -1, do this for all registers, skipping any that are | |
4951 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4952 | unless ALL is non-zero. | |
4953 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4954 | static void | |
3aee8918 PA |
4955 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4956 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4957 | { |
3aee8918 PA |
4958 | struct usrregs_info *usr = regs_info->usrregs; |
4959 | ||
1faeff08 MR |
4960 | if (regno == -1) |
4961 | { | |
3aee8918 PA |
4962 | for (regno = 0; regno < usr->num_regs; regno++) |
4963 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4964 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4965 | } |
4966 | else | |
3aee8918 | 4967 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4968 | } |
4969 | ||
4970 | /* Store our register values back into the inferior. | |
4971 | If REGNO is -1, do this for all registers, skipping any that are | |
4972 | assumed to have been saved by regsets_store_inferior_registers, | |
4973 | unless ALL is non-zero. | |
4974 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4975 | static void | |
3aee8918 PA |
4976 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4977 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4978 | { |
3aee8918 PA |
4979 | struct usrregs_info *usr = regs_info->usrregs; |
4980 | ||
1faeff08 MR |
4981 | if (regno == -1) |
4982 | { | |
3aee8918 PA |
4983 | for (regno = 0; regno < usr->num_regs; regno++) |
4984 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4985 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4986 | } |
4987 | else | |
3aee8918 | 4988 | store_register (usr, regcache, regno); |
1faeff08 MR |
4989 | } |
4990 | ||
4991 | #else /* !HAVE_LINUX_USRREGS */ | |
4992 | ||
3aee8918 PA |
4993 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4994 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4995 | |
58caa3dc | 4996 | #endif |
1faeff08 MR |
4997 | |
4998 | ||
4999 | void | |
5000 | linux_fetch_registers (struct regcache *regcache, int regno) | |
5001 | { | |
5002 | int use_regsets; | |
5003 | int all = 0; | |
3aee8918 | 5004 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5005 | |
5006 | if (regno == -1) | |
5007 | { | |
3aee8918 PA |
5008 | if (the_low_target.fetch_register != NULL |
5009 | && regs_info->usrregs != NULL) | |
5010 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
5011 | (*the_low_target.fetch_register) (regcache, regno); |
5012 | ||
3aee8918 PA |
5013 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5014 | if (regs_info->usrregs != NULL) | |
5015 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5016 | } |
5017 | else | |
5018 | { | |
c14dfd32 PA |
5019 | if (the_low_target.fetch_register != NULL |
5020 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5021 | return; | |
5022 | ||
3aee8918 | 5023 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5024 | if (use_regsets) |
3aee8918 PA |
5025 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5026 | regcache); | |
5027 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5028 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5029 | } |
58caa3dc DJ |
5030 | } |
5031 | ||
5032 | void | |
442ea881 | 5033 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 5034 | { |
1faeff08 MR |
5035 | int use_regsets; |
5036 | int all = 0; | |
3aee8918 | 5037 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5038 | |
5039 | if (regno == -1) | |
5040 | { | |
3aee8918 PA |
5041 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5042 | regcache); | |
5043 | if (regs_info->usrregs != NULL) | |
5044 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5045 | } |
5046 | else | |
5047 | { | |
3aee8918 | 5048 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5049 | if (use_regsets) |
3aee8918 PA |
5050 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5051 | regcache); | |
5052 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5053 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5054 | } |
58caa3dc DJ |
5055 | } |
5056 | ||
da6d8c04 | 5057 | |
da6d8c04 DJ |
5058 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5059 | to debugger memory starting at MYADDR. */ | |
5060 | ||
c3e735a6 | 5061 | static int |
f450004a | 5062 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5063 | { |
0bfdf32f | 5064 | int pid = lwpid_of (current_thread); |
4934b29e MR |
5065 | register PTRACE_XFER_TYPE *buffer; |
5066 | register CORE_ADDR addr; | |
5067 | register int count; | |
5068 | char filename[64]; | |
da6d8c04 | 5069 | register int i; |
4934b29e | 5070 | int ret; |
fd462a61 | 5071 | int fd; |
fd462a61 DJ |
5072 | |
5073 | /* Try using /proc. Don't bother for one word. */ | |
5074 | if (len >= 3 * sizeof (long)) | |
5075 | { | |
4934b29e MR |
5076 | int bytes; |
5077 | ||
fd462a61 DJ |
5078 | /* We could keep this file open and cache it - possibly one per |
5079 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5080 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5081 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5082 | if (fd == -1) | |
5083 | goto no_proc; | |
5084 | ||
5085 | /* If pread64 is available, use it. It's faster if the kernel | |
5086 | supports it (only one syscall), and it's 64-bit safe even on | |
5087 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5088 | application). */ | |
5089 | #ifdef HAVE_PREAD64 | |
4934b29e | 5090 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5091 | #else |
4934b29e MR |
5092 | bytes = -1; |
5093 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5094 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5095 | #endif |
fd462a61 DJ |
5096 | |
5097 | close (fd); | |
4934b29e MR |
5098 | if (bytes == len) |
5099 | return 0; | |
5100 | ||
5101 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5102 | if (bytes > 0) | |
5103 | { | |
5104 | memaddr += bytes; | |
5105 | myaddr += bytes; | |
5106 | len -= bytes; | |
5107 | } | |
fd462a61 | 5108 | } |
da6d8c04 | 5109 | |
fd462a61 | 5110 | no_proc: |
4934b29e MR |
5111 | /* Round starting address down to longword boundary. */ |
5112 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5113 | /* Round ending address up; get number of longwords that makes. */ | |
5114 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5115 | / sizeof (PTRACE_XFER_TYPE)); | |
5116 | /* Allocate buffer of that many longwords. */ | |
5117 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
5118 | ||
da6d8c04 | 5119 | /* Read all the longwords */ |
4934b29e | 5120 | errno = 0; |
da6d8c04 DJ |
5121 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5122 | { | |
14ce3065 DE |
5123 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5124 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5125 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5126 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5127 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5128 | if (errno) |
4934b29e | 5129 | break; |
da6d8c04 | 5130 | } |
4934b29e | 5131 | ret = errno; |
da6d8c04 DJ |
5132 | |
5133 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5134 | if (i > 0) |
5135 | { | |
5136 | i *= sizeof (PTRACE_XFER_TYPE); | |
5137 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5138 | memcpy (myaddr, | |
5139 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5140 | i < len ? i : len); | |
5141 | } | |
c3e735a6 | 5142 | |
4934b29e | 5143 | return ret; |
da6d8c04 DJ |
5144 | } |
5145 | ||
93ae6fdc PA |
5146 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5147 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5148 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5149 | |
ce3a066d | 5150 | static int |
f450004a | 5151 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
5152 | { |
5153 | register int i; | |
5154 | /* Round starting address down to longword boundary. */ | |
5155 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5156 | /* Round ending address up; get number of longwords that makes. */ | |
5157 | register int count | |
493e2a69 MS |
5158 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5159 | / sizeof (PTRACE_XFER_TYPE); | |
5160 | ||
da6d8c04 | 5161 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
5162 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
5163 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
5164 | ||
0bfdf32f | 5165 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5166 | |
f0ae6fc3 PA |
5167 | if (len == 0) |
5168 | { | |
5169 | /* Zero length write always succeeds. */ | |
5170 | return 0; | |
5171 | } | |
5172 | ||
0d62e5e8 DJ |
5173 | if (debug_threads) |
5174 | { | |
58d6951d DJ |
5175 | /* Dump up to four bytes. */ |
5176 | unsigned int val = * (unsigned int *) myaddr; | |
5177 | if (len == 1) | |
5178 | val = val & 0xff; | |
5179 | else if (len == 2) | |
5180 | val = val & 0xffff; | |
5181 | else if (len == 3) | |
5182 | val = val & 0xffffff; | |
de0d863e DB |
5183 | debug_printf ("Writing %0*x to 0x%08lx in process %d\n", |
5184 | 2 * ((len < 4) ? len : 4), val, (long)memaddr, pid); | |
0d62e5e8 DJ |
5185 | } |
5186 | ||
da6d8c04 DJ |
5187 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5188 | ||
93ae6fdc | 5189 | errno = 0; |
14ce3065 DE |
5190 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5191 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5192 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5193 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5194 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5195 | if (errno) |
5196 | return errno; | |
da6d8c04 DJ |
5197 | |
5198 | if (count > 1) | |
5199 | { | |
93ae6fdc | 5200 | errno = 0; |
da6d8c04 | 5201 | buffer[count - 1] |
95954743 | 5202 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5203 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5204 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5205 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5206 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5207 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5208 | if (errno) |
5209 | return errno; | |
da6d8c04 DJ |
5210 | } |
5211 | ||
93ae6fdc | 5212 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5213 | |
493e2a69 MS |
5214 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5215 | myaddr, len); | |
da6d8c04 DJ |
5216 | |
5217 | /* Write the entire buffer. */ | |
5218 | ||
5219 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5220 | { | |
5221 | errno = 0; | |
14ce3065 DE |
5222 | ptrace (PTRACE_POKETEXT, pid, |
5223 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5224 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5225 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5226 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5227 | if (errno) |
5228 | return errno; | |
5229 | } | |
5230 | ||
5231 | return 0; | |
5232 | } | |
2f2893d9 DJ |
5233 | |
5234 | static void | |
5235 | linux_look_up_symbols (void) | |
5236 | { | |
0d62e5e8 | 5237 | #ifdef USE_THREAD_DB |
95954743 PA |
5238 | struct process_info *proc = current_process (); |
5239 | ||
fe978cb0 | 5240 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5241 | return; |
5242 | ||
96d7229d LM |
5243 | /* If the kernel supports tracing clones, then we don't need to |
5244 | use the magic thread event breakpoint to learn about | |
5245 | threads. */ | |
5246 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
5247 | #endif |
5248 | } | |
5249 | ||
e5379b03 | 5250 | static void |
ef57601b | 5251 | linux_request_interrupt (void) |
e5379b03 | 5252 | { |
a1928bad | 5253 | extern unsigned long signal_pid; |
e5379b03 | 5254 | |
78708b7c PA |
5255 | /* Send a SIGINT to the process group. This acts just like the user |
5256 | typed a ^C on the controlling terminal. */ | |
5257 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
5258 | } |
5259 | ||
aa691b87 RM |
5260 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5261 | to debugger memory starting at MYADDR. */ | |
5262 | ||
5263 | static int | |
f450004a | 5264 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
5265 | { |
5266 | char filename[PATH_MAX]; | |
5267 | int fd, n; | |
0bfdf32f | 5268 | int pid = lwpid_of (current_thread); |
aa691b87 | 5269 | |
6cebaf6e | 5270 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5271 | |
5272 | fd = open (filename, O_RDONLY); | |
5273 | if (fd < 0) | |
5274 | return -1; | |
5275 | ||
5276 | if (offset != (CORE_ADDR) 0 | |
5277 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5278 | n = -1; | |
5279 | else | |
5280 | n = read (fd, myaddr, len); | |
5281 | ||
5282 | close (fd); | |
5283 | ||
5284 | return n; | |
5285 | } | |
5286 | ||
d993e290 PA |
5287 | /* These breakpoint and watchpoint related wrapper functions simply |
5288 | pass on the function call if the target has registered a | |
5289 | corresponding function. */ | |
e013ee27 OF |
5290 | |
5291 | static int | |
802e8e6d PA |
5292 | linux_supports_z_point_type (char z_type) |
5293 | { | |
5294 | return (the_low_target.supports_z_point_type != NULL | |
5295 | && the_low_target.supports_z_point_type (z_type)); | |
5296 | } | |
5297 | ||
5298 | static int | |
5299 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5300 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5301 | { |
c8f4bfdd YQ |
5302 | if (type == raw_bkpt_type_sw) |
5303 | return insert_memory_breakpoint (bp); | |
5304 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 5305 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5306 | else |
5307 | /* Unsupported (see target.h). */ | |
5308 | return 1; | |
5309 | } | |
5310 | ||
5311 | static int | |
802e8e6d PA |
5312 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
5313 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5314 | { |
c8f4bfdd YQ |
5315 | if (type == raw_bkpt_type_sw) |
5316 | return remove_memory_breakpoint (bp); | |
5317 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 5318 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5319 | else |
5320 | /* Unsupported (see target.h). */ | |
5321 | return 1; | |
5322 | } | |
5323 | ||
3e572f71 PA |
5324 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
5325 | method. */ | |
5326 | ||
5327 | static int | |
5328 | linux_stopped_by_sw_breakpoint (void) | |
5329 | { | |
5330 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5331 | ||
5332 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5333 | } | |
5334 | ||
5335 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
5336 | method. */ | |
5337 | ||
5338 | static int | |
5339 | linux_supports_stopped_by_sw_breakpoint (void) | |
5340 | { | |
5341 | return USE_SIGTRAP_SIGINFO; | |
5342 | } | |
5343 | ||
5344 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
5345 | method. */ | |
5346 | ||
5347 | static int | |
5348 | linux_stopped_by_hw_breakpoint (void) | |
5349 | { | |
5350 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5351 | ||
5352 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5353 | } | |
5354 | ||
5355 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
5356 | method. */ | |
5357 | ||
5358 | static int | |
5359 | linux_supports_stopped_by_hw_breakpoint (void) | |
5360 | { | |
5361 | return USE_SIGTRAP_SIGINFO; | |
5362 | } | |
5363 | ||
45614f15 YQ |
5364 | /* Implement the supports_conditional_breakpoints target_ops |
5365 | method. */ | |
5366 | ||
5367 | static int | |
5368 | linux_supports_conditional_breakpoints (void) | |
5369 | { | |
5370 | /* GDBserver needs to step over the breakpoint if the condition is | |
5371 | false. GDBserver software single step is too simple, so disable | |
5372 | conditional breakpoints if the target doesn't have hardware single | |
5373 | step. */ | |
5374 | return can_hardware_single_step (); | |
5375 | } | |
5376 | ||
e013ee27 OF |
5377 | static int |
5378 | linux_stopped_by_watchpoint (void) | |
5379 | { | |
0bfdf32f | 5380 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5381 | |
15c66dd6 | 5382 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5383 | } |
5384 | ||
5385 | static CORE_ADDR | |
5386 | linux_stopped_data_address (void) | |
5387 | { | |
0bfdf32f | 5388 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5389 | |
5390 | return lwp->stopped_data_address; | |
e013ee27 OF |
5391 | } |
5392 | ||
db0dfaa0 LM |
5393 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5394 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5395 | && defined(PT_TEXT_END_ADDR) | |
5396 | ||
5397 | /* This is only used for targets that define PT_TEXT_ADDR, | |
5398 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5399 | the target has different ways of acquiring this information, like | |
5400 | loadmaps. */ | |
52fb6437 NS |
5401 | |
5402 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
5403 | to tell gdb about. */ | |
5404 | ||
5405 | static int | |
5406 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
5407 | { | |
52fb6437 | 5408 | unsigned long text, text_end, data; |
62828379 | 5409 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5410 | |
5411 | errno = 0; | |
5412 | ||
b8e1b30e LM |
5413 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5414 | (PTRACE_TYPE_ARG4) 0); | |
5415 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5416 | (PTRACE_TYPE_ARG4) 0); | |
5417 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5418 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5419 | |
5420 | if (errno == 0) | |
5421 | { | |
5422 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5423 | used by gdb) are relative to the beginning of the program, |
5424 | with the data segment immediately following the text segment. | |
5425 | However, the actual runtime layout in memory may put the data | |
5426 | somewhere else, so when we send gdb a data base-address, we | |
5427 | use the real data base address and subtract the compile-time | |
5428 | data base-address from it (which is just the length of the | |
5429 | text segment). BSS immediately follows data in both | |
5430 | cases. */ | |
52fb6437 NS |
5431 | *text_p = text; |
5432 | *data_p = data - (text_end - text); | |
1b3f6016 | 5433 | |
52fb6437 NS |
5434 | return 1; |
5435 | } | |
52fb6437 NS |
5436 | return 0; |
5437 | } | |
5438 | #endif | |
5439 | ||
07e059b5 VP |
5440 | static int |
5441 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
5442 | unsigned char *readbuf, unsigned const char *writebuf, |
5443 | CORE_ADDR offset, int len) | |
07e059b5 | 5444 | { |
d26e3629 | 5445 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5446 | } |
5447 | ||
d0722149 DE |
5448 | /* Convert a native/host siginfo object, into/from the siginfo in the |
5449 | layout of the inferiors' architecture. */ | |
5450 | ||
5451 | static void | |
a5362b9a | 5452 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
5453 | { |
5454 | int done = 0; | |
5455 | ||
5456 | if (the_low_target.siginfo_fixup != NULL) | |
5457 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
5458 | ||
5459 | /* If there was no callback, or the callback didn't do anything, | |
5460 | then just do a straight memcpy. */ | |
5461 | if (!done) | |
5462 | { | |
5463 | if (direction == 1) | |
a5362b9a | 5464 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5465 | else |
a5362b9a | 5466 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5467 | } |
5468 | } | |
5469 | ||
4aa995e1 PA |
5470 | static int |
5471 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5472 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5473 | { | |
d0722149 | 5474 | int pid; |
a5362b9a TS |
5475 | siginfo_t siginfo; |
5476 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 5477 | |
0bfdf32f | 5478 | if (current_thread == NULL) |
4aa995e1 PA |
5479 | return -1; |
5480 | ||
0bfdf32f | 5481 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
5482 | |
5483 | if (debug_threads) | |
87ce2a04 DE |
5484 | debug_printf ("%s siginfo for lwp %d.\n", |
5485 | readbuf != NULL ? "Reading" : "Writing", | |
5486 | pid); | |
4aa995e1 | 5487 | |
0adea5f7 | 5488 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5489 | return -1; |
5490 | ||
b8e1b30e | 5491 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5492 | return -1; |
5493 | ||
d0722149 DE |
5494 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5495 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5496 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5497 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5498 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5499 | ||
4aa995e1 PA |
5500 | if (offset + len > sizeof (siginfo)) |
5501 | len = sizeof (siginfo) - offset; | |
5502 | ||
5503 | if (readbuf != NULL) | |
d0722149 | 5504 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5505 | else |
5506 | { | |
d0722149 DE |
5507 | memcpy (inf_siginfo + offset, writebuf, len); |
5508 | ||
5509 | /* Convert back to ptrace layout before flushing it out. */ | |
5510 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5511 | ||
b8e1b30e | 5512 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5513 | return -1; |
5514 | } | |
5515 | ||
5516 | return len; | |
5517 | } | |
5518 | ||
bd99dc85 PA |
5519 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5520 | so we notice when children change state; as the handler for the | |
5521 | sigsuspend in my_waitpid. */ | |
5522 | ||
5523 | static void | |
5524 | sigchld_handler (int signo) | |
5525 | { | |
5526 | int old_errno = errno; | |
5527 | ||
5528 | if (debug_threads) | |
e581f2b4 PA |
5529 | { |
5530 | do | |
5531 | { | |
5532 | /* fprintf is not async-signal-safe, so call write | |
5533 | directly. */ | |
5534 | if (write (2, "sigchld_handler\n", | |
5535 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5536 | break; /* just ignore */ | |
5537 | } while (0); | |
5538 | } | |
bd99dc85 PA |
5539 | |
5540 | if (target_is_async_p ()) | |
5541 | async_file_mark (); /* trigger a linux_wait */ | |
5542 | ||
5543 | errno = old_errno; | |
5544 | } | |
5545 | ||
5546 | static int | |
5547 | linux_supports_non_stop (void) | |
5548 | { | |
5549 | return 1; | |
5550 | } | |
5551 | ||
5552 | static int | |
5553 | linux_async (int enable) | |
5554 | { | |
7089dca4 | 5555 | int previous = target_is_async_p (); |
bd99dc85 | 5556 | |
8336d594 | 5557 | if (debug_threads) |
87ce2a04 DE |
5558 | debug_printf ("linux_async (%d), previous=%d\n", |
5559 | enable, previous); | |
8336d594 | 5560 | |
bd99dc85 PA |
5561 | if (previous != enable) |
5562 | { | |
5563 | sigset_t mask; | |
5564 | sigemptyset (&mask); | |
5565 | sigaddset (&mask, SIGCHLD); | |
5566 | ||
5567 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5568 | ||
5569 | if (enable) | |
5570 | { | |
5571 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5572 | { |
5573 | linux_event_pipe[0] = -1; | |
5574 | linux_event_pipe[1] = -1; | |
5575 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5576 | ||
5577 | warning ("creating event pipe failed."); | |
5578 | return previous; | |
5579 | } | |
bd99dc85 PA |
5580 | |
5581 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5582 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5583 | ||
5584 | /* Register the event loop handler. */ | |
5585 | add_file_handler (linux_event_pipe[0], | |
5586 | handle_target_event, NULL); | |
5587 | ||
5588 | /* Always trigger a linux_wait. */ | |
5589 | async_file_mark (); | |
5590 | } | |
5591 | else | |
5592 | { | |
5593 | delete_file_handler (linux_event_pipe[0]); | |
5594 | ||
5595 | close (linux_event_pipe[0]); | |
5596 | close (linux_event_pipe[1]); | |
5597 | linux_event_pipe[0] = -1; | |
5598 | linux_event_pipe[1] = -1; | |
5599 | } | |
5600 | ||
5601 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5602 | } | |
5603 | ||
5604 | return previous; | |
5605 | } | |
5606 | ||
5607 | static int | |
5608 | linux_start_non_stop (int nonstop) | |
5609 | { | |
5610 | /* Register or unregister from event-loop accordingly. */ | |
5611 | linux_async (nonstop); | |
aa96c426 GB |
5612 | |
5613 | if (target_is_async_p () != (nonstop != 0)) | |
5614 | return -1; | |
5615 | ||
bd99dc85 PA |
5616 | return 0; |
5617 | } | |
5618 | ||
cf8fd78b PA |
5619 | static int |
5620 | linux_supports_multi_process (void) | |
5621 | { | |
5622 | return 1; | |
5623 | } | |
5624 | ||
89245bc0 DB |
5625 | /* Check if fork events are supported. */ |
5626 | ||
5627 | static int | |
5628 | linux_supports_fork_events (void) | |
5629 | { | |
5630 | return linux_supports_tracefork (); | |
5631 | } | |
5632 | ||
5633 | /* Check if vfork events are supported. */ | |
5634 | ||
5635 | static int | |
5636 | linux_supports_vfork_events (void) | |
5637 | { | |
5638 | return linux_supports_tracefork (); | |
5639 | } | |
5640 | ||
de0d863e DB |
5641 | /* Callback for 'find_inferior'. Set the (possibly changed) ptrace |
5642 | options for the specified lwp. */ | |
5643 | ||
5644 | static int | |
5645 | reset_lwp_ptrace_options_callback (struct inferior_list_entry *entry, | |
5646 | void *args) | |
5647 | { | |
5648 | struct thread_info *thread = (struct thread_info *) entry; | |
5649 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5650 | ||
5651 | if (!lwp->stopped) | |
5652 | { | |
5653 | /* Stop the lwp so we can modify its ptrace options. */ | |
5654 | lwp->must_set_ptrace_flags = 1; | |
5655 | linux_stop_lwp (lwp); | |
5656 | } | |
5657 | else | |
5658 | { | |
5659 | /* Already stopped; go ahead and set the ptrace options. */ | |
5660 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
5661 | int options = linux_low_ptrace_options (proc->attached); | |
5662 | ||
5663 | linux_enable_event_reporting (lwpid_of (thread), options); | |
5664 | lwp->must_set_ptrace_flags = 0; | |
5665 | } | |
5666 | ||
5667 | return 0; | |
5668 | } | |
5669 | ||
5670 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the | |
5671 | ptrace flags for all inferiors. This is in case the new GDB connection | |
5672 | doesn't support the same set of events that the previous one did. */ | |
5673 | ||
5674 | static void | |
5675 | linux_handle_new_gdb_connection (void) | |
5676 | { | |
5677 | pid_t pid; | |
5678 | ||
5679 | /* Request that all the lwps reset their ptrace options. */ | |
5680 | find_inferior (&all_threads, reset_lwp_ptrace_options_callback , &pid); | |
5681 | } | |
5682 | ||
03583c20 UW |
5683 | static int |
5684 | linux_supports_disable_randomization (void) | |
5685 | { | |
5686 | #ifdef HAVE_PERSONALITY | |
5687 | return 1; | |
5688 | #else | |
5689 | return 0; | |
5690 | #endif | |
5691 | } | |
efcbbd14 | 5692 | |
d1feda86 YQ |
5693 | static int |
5694 | linux_supports_agent (void) | |
5695 | { | |
5696 | return 1; | |
5697 | } | |
5698 | ||
c2d6af84 PA |
5699 | static int |
5700 | linux_supports_range_stepping (void) | |
5701 | { | |
5702 | if (*the_low_target.supports_range_stepping == NULL) | |
5703 | return 0; | |
5704 | ||
5705 | return (*the_low_target.supports_range_stepping) (); | |
5706 | } | |
5707 | ||
efcbbd14 UW |
5708 | /* Enumerate spufs IDs for process PID. */ |
5709 | static int | |
5710 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5711 | { | |
5712 | int pos = 0; | |
5713 | int written = 0; | |
5714 | char path[128]; | |
5715 | DIR *dir; | |
5716 | struct dirent *entry; | |
5717 | ||
5718 | sprintf (path, "/proc/%ld/fd", pid); | |
5719 | dir = opendir (path); | |
5720 | if (!dir) | |
5721 | return -1; | |
5722 | ||
5723 | rewinddir (dir); | |
5724 | while ((entry = readdir (dir)) != NULL) | |
5725 | { | |
5726 | struct stat st; | |
5727 | struct statfs stfs; | |
5728 | int fd; | |
5729 | ||
5730 | fd = atoi (entry->d_name); | |
5731 | if (!fd) | |
5732 | continue; | |
5733 | ||
5734 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5735 | if (stat (path, &st) != 0) | |
5736 | continue; | |
5737 | if (!S_ISDIR (st.st_mode)) | |
5738 | continue; | |
5739 | ||
5740 | if (statfs (path, &stfs) != 0) | |
5741 | continue; | |
5742 | if (stfs.f_type != SPUFS_MAGIC) | |
5743 | continue; | |
5744 | ||
5745 | if (pos >= offset && pos + 4 <= offset + len) | |
5746 | { | |
5747 | *(unsigned int *)(buf + pos - offset) = fd; | |
5748 | written += 4; | |
5749 | } | |
5750 | pos += 4; | |
5751 | } | |
5752 | ||
5753 | closedir (dir); | |
5754 | return written; | |
5755 | } | |
5756 | ||
5757 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5758 | object type, using the /proc file system. */ | |
5759 | static int | |
5760 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5761 | unsigned const char *writebuf, | |
5762 | CORE_ADDR offset, int len) | |
5763 | { | |
0bfdf32f | 5764 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
5765 | char buf[128]; |
5766 | int fd = 0; | |
5767 | int ret = 0; | |
5768 | ||
5769 | if (!writebuf && !readbuf) | |
5770 | return -1; | |
5771 | ||
5772 | if (!*annex) | |
5773 | { | |
5774 | if (!readbuf) | |
5775 | return -1; | |
5776 | else | |
5777 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5778 | } | |
5779 | ||
5780 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5781 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5782 | if (fd <= 0) | |
5783 | return -1; | |
5784 | ||
5785 | if (offset != 0 | |
5786 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5787 | { | |
5788 | close (fd); | |
5789 | return 0; | |
5790 | } | |
5791 | ||
5792 | if (writebuf) | |
5793 | ret = write (fd, writebuf, (size_t) len); | |
5794 | else | |
5795 | ret = read (fd, readbuf, (size_t) len); | |
5796 | ||
5797 | close (fd); | |
5798 | return ret; | |
5799 | } | |
5800 | ||
723b724b | 5801 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5802 | struct target_loadseg |
5803 | { | |
5804 | /* Core address to which the segment is mapped. */ | |
5805 | Elf32_Addr addr; | |
5806 | /* VMA recorded in the program header. */ | |
5807 | Elf32_Addr p_vaddr; | |
5808 | /* Size of this segment in memory. */ | |
5809 | Elf32_Word p_memsz; | |
5810 | }; | |
5811 | ||
723b724b | 5812 | # if defined PT_GETDSBT |
78d85199 YQ |
5813 | struct target_loadmap |
5814 | { | |
5815 | /* Protocol version number, must be zero. */ | |
5816 | Elf32_Word version; | |
5817 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5818 | unsigned *dsbt_table; | |
5819 | unsigned dsbt_size, dsbt_index; | |
5820 | /* Number of segments in this map. */ | |
5821 | Elf32_Word nsegs; | |
5822 | /* The actual memory map. */ | |
5823 | struct target_loadseg segs[/*nsegs*/]; | |
5824 | }; | |
723b724b MF |
5825 | # define LINUX_LOADMAP PT_GETDSBT |
5826 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5827 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5828 | # else | |
5829 | struct target_loadmap | |
5830 | { | |
5831 | /* Protocol version number, must be zero. */ | |
5832 | Elf32_Half version; | |
5833 | /* Number of segments in this map. */ | |
5834 | Elf32_Half nsegs; | |
5835 | /* The actual memory map. */ | |
5836 | struct target_loadseg segs[/*nsegs*/]; | |
5837 | }; | |
5838 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5839 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5840 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5841 | # endif | |
78d85199 | 5842 | |
78d85199 YQ |
5843 | static int |
5844 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5845 | unsigned char *myaddr, unsigned int len) | |
5846 | { | |
0bfdf32f | 5847 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
5848 | int addr = -1; |
5849 | struct target_loadmap *data = NULL; | |
5850 | unsigned int actual_length, copy_length; | |
5851 | ||
5852 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5853 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5854 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5855 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5856 | else |
5857 | return -1; | |
5858 | ||
723b724b | 5859 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5860 | return -1; |
5861 | ||
5862 | if (data == NULL) | |
5863 | return -1; | |
5864 | ||
5865 | actual_length = sizeof (struct target_loadmap) | |
5866 | + sizeof (struct target_loadseg) * data->nsegs; | |
5867 | ||
5868 | if (offset < 0 || offset > actual_length) | |
5869 | return -1; | |
5870 | ||
5871 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5872 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5873 | return copy_length; | |
5874 | } | |
723b724b MF |
5875 | #else |
5876 | # define linux_read_loadmap NULL | |
5877 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5878 | |
1570b33e L |
5879 | static void |
5880 | linux_process_qsupported (const char *query) | |
5881 | { | |
5882 | if (the_low_target.process_qsupported != NULL) | |
5883 | the_low_target.process_qsupported (query); | |
5884 | } | |
5885 | ||
219f2f23 PA |
5886 | static int |
5887 | linux_supports_tracepoints (void) | |
5888 | { | |
5889 | if (*the_low_target.supports_tracepoints == NULL) | |
5890 | return 0; | |
5891 | ||
5892 | return (*the_low_target.supports_tracepoints) (); | |
5893 | } | |
5894 | ||
5895 | static CORE_ADDR | |
5896 | linux_read_pc (struct regcache *regcache) | |
5897 | { | |
5898 | if (the_low_target.get_pc == NULL) | |
5899 | return 0; | |
5900 | ||
5901 | return (*the_low_target.get_pc) (regcache); | |
5902 | } | |
5903 | ||
5904 | static void | |
5905 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5906 | { | |
5907 | gdb_assert (the_low_target.set_pc != NULL); | |
5908 | ||
5909 | (*the_low_target.set_pc) (regcache, pc); | |
5910 | } | |
5911 | ||
8336d594 PA |
5912 | static int |
5913 | linux_thread_stopped (struct thread_info *thread) | |
5914 | { | |
5915 | return get_thread_lwp (thread)->stopped; | |
5916 | } | |
5917 | ||
5918 | /* This exposes stop-all-threads functionality to other modules. */ | |
5919 | ||
5920 | static void | |
7984d532 | 5921 | linux_pause_all (int freeze) |
8336d594 | 5922 | { |
7984d532 PA |
5923 | stop_all_lwps (freeze, NULL); |
5924 | } | |
5925 | ||
5926 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5927 | modules. */ | |
5928 | ||
5929 | static void | |
5930 | linux_unpause_all (int unfreeze) | |
5931 | { | |
5932 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5933 | } |
5934 | ||
90d74c30 PA |
5935 | static int |
5936 | linux_prepare_to_access_memory (void) | |
5937 | { | |
5938 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5939 | running LWP. */ | |
5940 | if (non_stop) | |
5941 | linux_pause_all (1); | |
5942 | return 0; | |
5943 | } | |
5944 | ||
5945 | static void | |
0146f85b | 5946 | linux_done_accessing_memory (void) |
90d74c30 PA |
5947 | { |
5948 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5949 | running LWP. */ | |
5950 | if (non_stop) | |
5951 | linux_unpause_all (1); | |
5952 | } | |
5953 | ||
fa593d66 PA |
5954 | static int |
5955 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5956 | CORE_ADDR collector, | |
5957 | CORE_ADDR lockaddr, | |
5958 | ULONGEST orig_size, | |
5959 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5960 | CORE_ADDR *trampoline, |
5961 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5962 | unsigned char *jjump_pad_insn, |
5963 | ULONGEST *jjump_pad_insn_size, | |
5964 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5965 | CORE_ADDR *adjusted_insn_addr_end, |
5966 | char *err) | |
fa593d66 PA |
5967 | { |
5968 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5969 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5970 | jump_entry, trampoline, trampoline_size, |
5971 | jjump_pad_insn, jjump_pad_insn_size, | |
5972 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5973 | err); | |
fa593d66 PA |
5974 | } |
5975 | ||
6a271cae PA |
5976 | static struct emit_ops * |
5977 | linux_emit_ops (void) | |
5978 | { | |
5979 | if (the_low_target.emit_ops != NULL) | |
5980 | return (*the_low_target.emit_ops) (); | |
5981 | else | |
5982 | return NULL; | |
5983 | } | |
5984 | ||
405f8e94 SS |
5985 | static int |
5986 | linux_get_min_fast_tracepoint_insn_len (void) | |
5987 | { | |
5988 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5989 | } | |
5990 | ||
2268b414 JK |
5991 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5992 | ||
5993 | static int | |
5994 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5995 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5996 | { | |
5997 | char filename[PATH_MAX]; | |
5998 | int fd; | |
5999 | const int auxv_size = is_elf64 | |
6000 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6001 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6002 | ||
6003 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6004 | ||
6005 | fd = open (filename, O_RDONLY); | |
6006 | if (fd < 0) | |
6007 | return 1; | |
6008 | ||
6009 | *phdr_memaddr = 0; | |
6010 | *num_phdr = 0; | |
6011 | while (read (fd, buf, auxv_size) == auxv_size | |
6012 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6013 | { | |
6014 | if (is_elf64) | |
6015 | { | |
6016 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6017 | ||
6018 | switch (aux->a_type) | |
6019 | { | |
6020 | case AT_PHDR: | |
6021 | *phdr_memaddr = aux->a_un.a_val; | |
6022 | break; | |
6023 | case AT_PHNUM: | |
6024 | *num_phdr = aux->a_un.a_val; | |
6025 | break; | |
6026 | } | |
6027 | } | |
6028 | else | |
6029 | { | |
6030 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6031 | ||
6032 | switch (aux->a_type) | |
6033 | { | |
6034 | case AT_PHDR: | |
6035 | *phdr_memaddr = aux->a_un.a_val; | |
6036 | break; | |
6037 | case AT_PHNUM: | |
6038 | *num_phdr = aux->a_un.a_val; | |
6039 | break; | |
6040 | } | |
6041 | } | |
6042 | } | |
6043 | ||
6044 | close (fd); | |
6045 | ||
6046 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6047 | { | |
6048 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6049 | "phdr_memaddr = %ld, phdr_num = %d", | |
6050 | (long) *phdr_memaddr, *num_phdr); | |
6051 | return 2; | |
6052 | } | |
6053 | ||
6054 | return 0; | |
6055 | } | |
6056 | ||
6057 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6058 | ||
6059 | static CORE_ADDR | |
6060 | get_dynamic (const int pid, const int is_elf64) | |
6061 | { | |
6062 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6063 | int num_phdr, i; |
2268b414 | 6064 | unsigned char *phdr_buf; |
db1ff28b | 6065 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6066 | |
6067 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6068 | return 0; | |
6069 | ||
6070 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
6071 | phdr_buf = alloca (num_phdr * phdr_size); | |
6072 | ||
6073 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6074 | return 0; | |
6075 | ||
6076 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6077 | non-zero for PIE ones. */ | |
6078 | relocation = -1; | |
db1ff28b JK |
6079 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6080 | if (is_elf64) | |
6081 | { | |
6082 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6083 | ||
6084 | if (p->p_type == PT_PHDR) | |
6085 | relocation = phdr_memaddr - p->p_vaddr; | |
6086 | } | |
6087 | else | |
6088 | { | |
6089 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6090 | ||
6091 | if (p->p_type == PT_PHDR) | |
6092 | relocation = phdr_memaddr - p->p_vaddr; | |
6093 | } | |
6094 | ||
2268b414 JK |
6095 | if (relocation == -1) |
6096 | { | |
e237a7e2 JK |
6097 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6098 | any real world executables, including PIE executables, have always | |
6099 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6100 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6101 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6102 | ||
6103 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6104 | ||
6105 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6106 | ||
2268b414 JK |
6107 | return 0; |
6108 | } | |
6109 | ||
db1ff28b JK |
6110 | for (i = 0; i < num_phdr; i++) |
6111 | { | |
6112 | if (is_elf64) | |
6113 | { | |
6114 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6115 | ||
6116 | if (p->p_type == PT_DYNAMIC) | |
6117 | return p->p_vaddr + relocation; | |
6118 | } | |
6119 | else | |
6120 | { | |
6121 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6122 | |
db1ff28b JK |
6123 | if (p->p_type == PT_DYNAMIC) |
6124 | return p->p_vaddr + relocation; | |
6125 | } | |
6126 | } | |
2268b414 JK |
6127 | |
6128 | return 0; | |
6129 | } | |
6130 | ||
6131 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6132 | can be 0 if the inferior does not yet have the library list initialized. |
6133 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6134 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6135 | |
6136 | static CORE_ADDR | |
6137 | get_r_debug (const int pid, const int is_elf64) | |
6138 | { | |
6139 | CORE_ADDR dynamic_memaddr; | |
6140 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6141 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6142 | CORE_ADDR map = -1; |
2268b414 JK |
6143 | |
6144 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6145 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6146 | return map; |
2268b414 JK |
6147 | |
6148 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6149 | { | |
6150 | if (is_elf64) | |
6151 | { | |
6152 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 6153 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
6154 | union |
6155 | { | |
6156 | Elf64_Xword map; | |
6157 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6158 | } | |
6159 | rld_map; | |
6160 | ||
6161 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
6162 | { | |
6163 | if (linux_read_memory (dyn->d_un.d_val, | |
6164 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6165 | return rld_map.map; | |
6166 | else | |
6167 | break; | |
6168 | } | |
75f62ce7 | 6169 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 6170 | |
367ba2c2 MR |
6171 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6172 | map = dyn->d_un.d_val; | |
2268b414 JK |
6173 | |
6174 | if (dyn->d_tag == DT_NULL) | |
6175 | break; | |
6176 | } | |
6177 | else | |
6178 | { | |
6179 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 6180 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
6181 | union |
6182 | { | |
6183 | Elf32_Word map; | |
6184 | unsigned char buf[sizeof (Elf32_Word)]; | |
6185 | } | |
6186 | rld_map; | |
6187 | ||
6188 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
6189 | { | |
6190 | if (linux_read_memory (dyn->d_un.d_val, | |
6191 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6192 | return rld_map.map; | |
6193 | else | |
6194 | break; | |
6195 | } | |
75f62ce7 | 6196 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 6197 | |
367ba2c2 MR |
6198 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6199 | map = dyn->d_un.d_val; | |
2268b414 JK |
6200 | |
6201 | if (dyn->d_tag == DT_NULL) | |
6202 | break; | |
6203 | } | |
6204 | ||
6205 | dynamic_memaddr += dyn_size; | |
6206 | } | |
6207 | ||
367ba2c2 | 6208 | return map; |
2268b414 JK |
6209 | } |
6210 | ||
6211 | /* Read one pointer from MEMADDR in the inferior. */ | |
6212 | ||
6213 | static int | |
6214 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6215 | { | |
485f1ee4 PA |
6216 | int ret; |
6217 | ||
6218 | /* Go through a union so this works on either big or little endian | |
6219 | hosts, when the inferior's pointer size is smaller than the size | |
6220 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6221 | same of the superior's. */ | |
6222 | union | |
6223 | { | |
6224 | CORE_ADDR core_addr; | |
6225 | unsigned int ui; | |
6226 | unsigned char uc; | |
6227 | } addr; | |
6228 | ||
6229 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6230 | if (ret == 0) | |
6231 | { | |
6232 | if (ptr_size == sizeof (CORE_ADDR)) | |
6233 | *ptr = addr.core_addr; | |
6234 | else if (ptr_size == sizeof (unsigned int)) | |
6235 | *ptr = addr.ui; | |
6236 | else | |
6237 | gdb_assert_not_reached ("unhandled pointer size"); | |
6238 | } | |
6239 | return ret; | |
2268b414 JK |
6240 | } |
6241 | ||
6242 | struct link_map_offsets | |
6243 | { | |
6244 | /* Offset and size of r_debug.r_version. */ | |
6245 | int r_version_offset; | |
6246 | ||
6247 | /* Offset and size of r_debug.r_map. */ | |
6248 | int r_map_offset; | |
6249 | ||
6250 | /* Offset to l_addr field in struct link_map. */ | |
6251 | int l_addr_offset; | |
6252 | ||
6253 | /* Offset to l_name field in struct link_map. */ | |
6254 | int l_name_offset; | |
6255 | ||
6256 | /* Offset to l_ld field in struct link_map. */ | |
6257 | int l_ld_offset; | |
6258 | ||
6259 | /* Offset to l_next field in struct link_map. */ | |
6260 | int l_next_offset; | |
6261 | ||
6262 | /* Offset to l_prev field in struct link_map. */ | |
6263 | int l_prev_offset; | |
6264 | }; | |
6265 | ||
fb723180 | 6266 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
6267 | |
6268 | static int | |
6269 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
6270 | unsigned const char *writebuf, | |
6271 | CORE_ADDR offset, int len) | |
6272 | { | |
6273 | char *document; | |
6274 | unsigned document_len; | |
fe978cb0 | 6275 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6276 | char filename[PATH_MAX]; |
6277 | int pid, is_elf64; | |
6278 | ||
6279 | static const struct link_map_offsets lmo_32bit_offsets = | |
6280 | { | |
6281 | 0, /* r_version offset. */ | |
6282 | 4, /* r_debug.r_map offset. */ | |
6283 | 0, /* l_addr offset in link_map. */ | |
6284 | 4, /* l_name offset in link_map. */ | |
6285 | 8, /* l_ld offset in link_map. */ | |
6286 | 12, /* l_next offset in link_map. */ | |
6287 | 16 /* l_prev offset in link_map. */ | |
6288 | }; | |
6289 | ||
6290 | static const struct link_map_offsets lmo_64bit_offsets = | |
6291 | { | |
6292 | 0, /* r_version offset. */ | |
6293 | 8, /* r_debug.r_map offset. */ | |
6294 | 0, /* l_addr offset in link_map. */ | |
6295 | 8, /* l_name offset in link_map. */ | |
6296 | 16, /* l_ld offset in link_map. */ | |
6297 | 24, /* l_next offset in link_map. */ | |
6298 | 32 /* l_prev offset in link_map. */ | |
6299 | }; | |
6300 | const struct link_map_offsets *lmo; | |
214d508e | 6301 | unsigned int machine; |
b1fbec62 GB |
6302 | int ptr_size; |
6303 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
6304 | int allocated = 1024; | |
6305 | char *p; | |
6306 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
6307 | int header_done = 0; | |
2268b414 JK |
6308 | |
6309 | if (writebuf != NULL) | |
6310 | return -2; | |
6311 | if (readbuf == NULL) | |
6312 | return -1; | |
6313 | ||
0bfdf32f | 6314 | pid = lwpid_of (current_thread); |
2268b414 | 6315 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6316 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6317 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6318 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6319 | |
b1fbec62 GB |
6320 | while (annex[0] != '\0') |
6321 | { | |
6322 | const char *sep; | |
6323 | CORE_ADDR *addrp; | |
6324 | int len; | |
2268b414 | 6325 | |
b1fbec62 GB |
6326 | sep = strchr (annex, '='); |
6327 | if (sep == NULL) | |
6328 | break; | |
0c5bf5a9 | 6329 | |
b1fbec62 | 6330 | len = sep - annex; |
61012eef | 6331 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 6332 | addrp = &lm_addr; |
61012eef | 6333 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6334 | addrp = &lm_prev; |
6335 | else | |
6336 | { | |
6337 | annex = strchr (sep, ';'); | |
6338 | if (annex == NULL) | |
6339 | break; | |
6340 | annex++; | |
6341 | continue; | |
6342 | } | |
6343 | ||
6344 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6345 | } |
b1fbec62 GB |
6346 | |
6347 | if (lm_addr == 0) | |
2268b414 | 6348 | { |
b1fbec62 GB |
6349 | int r_version = 0; |
6350 | ||
6351 | if (priv->r_debug == 0) | |
6352 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6353 | ||
6354 | /* We failed to find DT_DEBUG. Such situation will not change | |
6355 | for this inferior - do not retry it. Report it to GDB as | |
6356 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6357 | if (priv->r_debug == (CORE_ADDR) -1) | |
6358 | return -1; | |
6359 | ||
6360 | if (priv->r_debug != 0) | |
2268b414 | 6361 | { |
b1fbec62 GB |
6362 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6363 | (unsigned char *) &r_version, | |
6364 | sizeof (r_version)) != 0 | |
6365 | || r_version != 1) | |
6366 | { | |
6367 | warning ("unexpected r_debug version %d", r_version); | |
6368 | } | |
6369 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6370 | &lm_addr, ptr_size) != 0) | |
6371 | { | |
6372 | warning ("unable to read r_map from 0x%lx", | |
6373 | (long) priv->r_debug + lmo->r_map_offset); | |
6374 | } | |
2268b414 | 6375 | } |
b1fbec62 | 6376 | } |
2268b414 | 6377 | |
b1fbec62 GB |
6378 | document = xmalloc (allocated); |
6379 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
6380 | p = document + strlen (document); | |
6381 | ||
6382 | while (lm_addr | |
6383 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6384 | &l_name, ptr_size) == 0 | |
6385 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6386 | &l_addr, ptr_size) == 0 | |
6387 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6388 | &l_ld, ptr_size) == 0 | |
6389 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6390 | &l_prev, ptr_size) == 0 | |
6391 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6392 | &l_next, ptr_size) == 0) | |
6393 | { | |
6394 | unsigned char libname[PATH_MAX]; | |
6395 | ||
6396 | if (lm_prev != l_prev) | |
2268b414 | 6397 | { |
b1fbec62 GB |
6398 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6399 | (long) lm_prev, (long) l_prev); | |
6400 | break; | |
2268b414 JK |
6401 | } |
6402 | ||
d878444c JK |
6403 | /* Ignore the first entry even if it has valid name as the first entry |
6404 | corresponds to the main executable. The first entry should not be | |
6405 | skipped if the dynamic loader was loaded late by a static executable | |
6406 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6407 | executable does not have PT_DYNAMIC present and this function already | |
6408 | exited above due to failed get_r_debug. */ | |
6409 | if (lm_prev == 0) | |
2268b414 | 6410 | { |
d878444c JK |
6411 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
6412 | p = p + strlen (p); | |
6413 | } | |
6414 | else | |
6415 | { | |
6416 | /* Not checking for error because reading may stop before | |
6417 | we've got PATH_MAX worth of characters. */ | |
6418 | libname[0] = '\0'; | |
6419 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6420 | libname[sizeof (libname) - 1] = '\0'; | |
6421 | if (libname[0] != '\0') | |
2268b414 | 6422 | { |
d878444c JK |
6423 | /* 6x the size for xml_escape_text below. */ |
6424 | size_t len = 6 * strlen ((char *) libname); | |
6425 | char *name; | |
2268b414 | 6426 | |
d878444c JK |
6427 | if (!header_done) |
6428 | { | |
6429 | /* Terminate `<library-list-svr4'. */ | |
6430 | *p++ = '>'; | |
6431 | header_done = 1; | |
6432 | } | |
2268b414 | 6433 | |
db1ff28b | 6434 | while (allocated < p - document + len + 200) |
d878444c JK |
6435 | { |
6436 | /* Expand to guarantee sufficient storage. */ | |
6437 | uintptr_t document_len = p - document; | |
2268b414 | 6438 | |
d878444c JK |
6439 | document = xrealloc (document, 2 * allocated); |
6440 | allocated *= 2; | |
6441 | p = document + document_len; | |
6442 | } | |
6443 | ||
6444 | name = xml_escape_text ((char *) libname); | |
6445 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
db1ff28b | 6446 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
d878444c JK |
6447 | name, (unsigned long) lm_addr, |
6448 | (unsigned long) l_addr, (unsigned long) l_ld); | |
6449 | free (name); | |
6450 | } | |
0afae3cf | 6451 | } |
b1fbec62 GB |
6452 | |
6453 | lm_prev = lm_addr; | |
6454 | lm_addr = l_next; | |
2268b414 JK |
6455 | } |
6456 | ||
b1fbec62 GB |
6457 | if (!header_done) |
6458 | { | |
6459 | /* Empty list; terminate `<library-list-svr4'. */ | |
6460 | strcpy (p, "/>"); | |
6461 | } | |
6462 | else | |
6463 | strcpy (p, "</library-list-svr4>"); | |
6464 | ||
2268b414 JK |
6465 | document_len = strlen (document); |
6466 | if (offset < document_len) | |
6467 | document_len -= offset; | |
6468 | else | |
6469 | document_len = 0; | |
6470 | if (len > document_len) | |
6471 | len = document_len; | |
6472 | ||
6473 | memcpy (readbuf, document + offset, len); | |
6474 | xfree (document); | |
6475 | ||
6476 | return len; | |
6477 | } | |
6478 | ||
9accd112 MM |
6479 | #ifdef HAVE_LINUX_BTRACE |
6480 | ||
969c39fb | 6481 | /* See to_enable_btrace target method. */ |
9accd112 MM |
6482 | |
6483 | static struct btrace_target_info * | |
f4abbc16 | 6484 | linux_low_enable_btrace (ptid_t ptid, const struct btrace_config *conf) |
9accd112 MM |
6485 | { |
6486 | struct btrace_target_info *tinfo; | |
6487 | ||
f4abbc16 | 6488 | tinfo = linux_enable_btrace (ptid, conf); |
3aee8918 | 6489 | |
d68e53f4 | 6490 | if (tinfo != NULL && tinfo->ptr_bits == 0) |
3aee8918 PA |
6491 | { |
6492 | struct thread_info *thread = find_thread_ptid (ptid); | |
6493 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
6494 | ||
6495 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
6496 | } | |
9accd112 MM |
6497 | |
6498 | return tinfo; | |
6499 | } | |
6500 | ||
969c39fb | 6501 | /* See to_disable_btrace target method. */ |
9accd112 | 6502 | |
969c39fb MM |
6503 | static int |
6504 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
6505 | { | |
6506 | enum btrace_error err; | |
6507 | ||
6508 | err = linux_disable_btrace (tinfo); | |
6509 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6510 | } | |
6511 | ||
b20a6524 MM |
6512 | /* Encode an Intel(R) Processor Trace configuration. */ |
6513 | ||
6514 | static void | |
6515 | linux_low_encode_pt_config (struct buffer *buffer, | |
6516 | const struct btrace_data_pt_config *config) | |
6517 | { | |
6518 | buffer_grow_str (buffer, "<pt-config>\n"); | |
6519 | ||
6520 | switch (config->cpu.vendor) | |
6521 | { | |
6522 | case CV_INTEL: | |
6523 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
6524 | "model=\"%u\" stepping=\"%u\"/>\n", | |
6525 | config->cpu.family, config->cpu.model, | |
6526 | config->cpu.stepping); | |
6527 | break; | |
6528 | ||
6529 | default: | |
6530 | break; | |
6531 | } | |
6532 | ||
6533 | buffer_grow_str (buffer, "</pt-config>\n"); | |
6534 | } | |
6535 | ||
6536 | /* Encode a raw buffer. */ | |
6537 | ||
6538 | static void | |
6539 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
6540 | unsigned int size) | |
6541 | { | |
6542 | if (size == 0) | |
6543 | return; | |
6544 | ||
6545 | /* We use hex encoding - see common/rsp-low.h. */ | |
6546 | buffer_grow_str (buffer, "<raw>\n"); | |
6547 | ||
6548 | while (size-- > 0) | |
6549 | { | |
6550 | char elem[2]; | |
6551 | ||
6552 | elem[0] = tohex ((*data >> 4) & 0xf); | |
6553 | elem[1] = tohex (*data++ & 0xf); | |
6554 | ||
6555 | buffer_grow (buffer, elem, 2); | |
6556 | } | |
6557 | ||
6558 | buffer_grow_str (buffer, "</raw>\n"); | |
6559 | } | |
6560 | ||
969c39fb MM |
6561 | /* See to_read_btrace target method. */ |
6562 | ||
6563 | static int | |
9accd112 MM |
6564 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
6565 | int type) | |
6566 | { | |
734b0e4b | 6567 | struct btrace_data btrace; |
9accd112 | 6568 | struct btrace_block *block; |
969c39fb | 6569 | enum btrace_error err; |
9accd112 MM |
6570 | int i; |
6571 | ||
734b0e4b MM |
6572 | btrace_data_init (&btrace); |
6573 | ||
969c39fb MM |
6574 | err = linux_read_btrace (&btrace, tinfo, type); |
6575 | if (err != BTRACE_ERR_NONE) | |
6576 | { | |
6577 | if (err == BTRACE_ERR_OVERFLOW) | |
6578 | buffer_grow_str0 (buffer, "E.Overflow."); | |
6579 | else | |
6580 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
6581 | ||
b20a6524 | 6582 | goto err; |
969c39fb | 6583 | } |
9accd112 | 6584 | |
734b0e4b MM |
6585 | switch (btrace.format) |
6586 | { | |
6587 | case BTRACE_FORMAT_NONE: | |
6588 | buffer_grow_str0 (buffer, "E.No Trace."); | |
b20a6524 | 6589 | goto err; |
734b0e4b MM |
6590 | |
6591 | case BTRACE_FORMAT_BTS: | |
6592 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6593 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 6594 | |
734b0e4b MM |
6595 | for (i = 0; |
6596 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
6597 | i++) | |
6598 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
6599 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 6600 | |
734b0e4b MM |
6601 | buffer_grow_str0 (buffer, "</btrace>\n"); |
6602 | break; | |
6603 | ||
b20a6524 MM |
6604 | case BTRACE_FORMAT_PT: |
6605 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6606 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
6607 | buffer_grow_str (buffer, "<pt>\n"); | |
6608 | ||
6609 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 6610 | |
b20a6524 MM |
6611 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
6612 | btrace.variant.pt.size); | |
6613 | ||
6614 | buffer_grow_str (buffer, "</pt>\n"); | |
6615 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
6616 | break; | |
6617 | ||
6618 | default: | |
6619 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
6620 | goto err; | |
734b0e4b | 6621 | } |
969c39fb | 6622 | |
734b0e4b | 6623 | btrace_data_fini (&btrace); |
969c39fb | 6624 | return 0; |
b20a6524 MM |
6625 | |
6626 | err: | |
6627 | btrace_data_fini (&btrace); | |
6628 | return -1; | |
9accd112 | 6629 | } |
f4abbc16 MM |
6630 | |
6631 | /* See to_btrace_conf target method. */ | |
6632 | ||
6633 | static int | |
6634 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
6635 | struct buffer *buffer) | |
6636 | { | |
6637 | const struct btrace_config *conf; | |
6638 | ||
6639 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
6640 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
6641 | ||
6642 | conf = linux_btrace_conf (tinfo); | |
6643 | if (conf != NULL) | |
6644 | { | |
6645 | switch (conf->format) | |
6646 | { | |
6647 | case BTRACE_FORMAT_NONE: | |
6648 | break; | |
6649 | ||
6650 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
6651 | buffer_xml_printf (buffer, "<bts"); |
6652 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
6653 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 6654 | break; |
b20a6524 MM |
6655 | |
6656 | case BTRACE_FORMAT_PT: | |
6657 | buffer_xml_printf (buffer, "<pt"); | |
6658 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
6659 | buffer_xml_printf (buffer, "/>\n"); | |
6660 | break; | |
f4abbc16 MM |
6661 | } |
6662 | } | |
6663 | ||
6664 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
6665 | return 0; | |
6666 | } | |
9accd112 MM |
6667 | #endif /* HAVE_LINUX_BTRACE */ |
6668 | ||
7b669087 GB |
6669 | /* See nat/linux-nat.h. */ |
6670 | ||
6671 | ptid_t | |
6672 | current_lwp_ptid (void) | |
6673 | { | |
6674 | return ptid_of (current_thread); | |
6675 | } | |
6676 | ||
ce3a066d DJ |
6677 | static struct target_ops linux_target_ops = { |
6678 | linux_create_inferior, | |
c06cbd92 | 6679 | linux_arch_setup, |
ce3a066d DJ |
6680 | linux_attach, |
6681 | linux_kill, | |
6ad8ae5c | 6682 | linux_detach, |
8336d594 | 6683 | linux_mourn, |
444d6139 | 6684 | linux_join, |
ce3a066d DJ |
6685 | linux_thread_alive, |
6686 | linux_resume, | |
6687 | linux_wait, | |
6688 | linux_fetch_registers, | |
6689 | linux_store_registers, | |
90d74c30 | 6690 | linux_prepare_to_access_memory, |
0146f85b | 6691 | linux_done_accessing_memory, |
ce3a066d DJ |
6692 | linux_read_memory, |
6693 | linux_write_memory, | |
2f2893d9 | 6694 | linux_look_up_symbols, |
ef57601b | 6695 | linux_request_interrupt, |
aa691b87 | 6696 | linux_read_auxv, |
802e8e6d | 6697 | linux_supports_z_point_type, |
d993e290 PA |
6698 | linux_insert_point, |
6699 | linux_remove_point, | |
3e572f71 PA |
6700 | linux_stopped_by_sw_breakpoint, |
6701 | linux_supports_stopped_by_sw_breakpoint, | |
6702 | linux_stopped_by_hw_breakpoint, | |
6703 | linux_supports_stopped_by_hw_breakpoint, | |
45614f15 | 6704 | linux_supports_conditional_breakpoints, |
e013ee27 OF |
6705 | linux_stopped_by_watchpoint, |
6706 | linux_stopped_data_address, | |
db0dfaa0 LM |
6707 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6708 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6709 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6710 | linux_read_offsets, |
dae5f5cf DJ |
6711 | #else |
6712 | NULL, | |
6713 | #endif | |
6714 | #ifdef USE_THREAD_DB | |
6715 | thread_db_get_tls_address, | |
6716 | #else | |
6717 | NULL, | |
52fb6437 | 6718 | #endif |
efcbbd14 | 6719 | linux_qxfer_spu, |
59a016f0 | 6720 | hostio_last_error_from_errno, |
07e059b5 | 6721 | linux_qxfer_osdata, |
4aa995e1 | 6722 | linux_xfer_siginfo, |
bd99dc85 PA |
6723 | linux_supports_non_stop, |
6724 | linux_async, | |
6725 | linux_start_non_stop, | |
cdbfd419 | 6726 | linux_supports_multi_process, |
89245bc0 DB |
6727 | linux_supports_fork_events, |
6728 | linux_supports_vfork_events, | |
de0d863e | 6729 | linux_handle_new_gdb_connection, |
cdbfd419 | 6730 | #ifdef USE_THREAD_DB |
dc146f7c | 6731 | thread_db_handle_monitor_command, |
cdbfd419 | 6732 | #else |
dc146f7c | 6733 | NULL, |
cdbfd419 | 6734 | #endif |
d26e3629 | 6735 | linux_common_core_of_thread, |
78d85199 | 6736 | linux_read_loadmap, |
219f2f23 PA |
6737 | linux_process_qsupported, |
6738 | linux_supports_tracepoints, | |
6739 | linux_read_pc, | |
8336d594 PA |
6740 | linux_write_pc, |
6741 | linux_thread_stopped, | |
7984d532 | 6742 | NULL, |
711e434b | 6743 | linux_pause_all, |
7984d532 | 6744 | linux_unpause_all, |
fa593d66 | 6745 | linux_stabilize_threads, |
6a271cae | 6746 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6747 | linux_emit_ops, |
6748 | linux_supports_disable_randomization, | |
405f8e94 | 6749 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6750 | linux_qxfer_libraries_svr4, |
d1feda86 | 6751 | linux_supports_agent, |
9accd112 MM |
6752 | #ifdef HAVE_LINUX_BTRACE |
6753 | linux_supports_btrace, | |
6754 | linux_low_enable_btrace, | |
969c39fb | 6755 | linux_low_disable_btrace, |
9accd112 | 6756 | linux_low_read_btrace, |
f4abbc16 | 6757 | linux_low_btrace_conf, |
9accd112 MM |
6758 | #else |
6759 | NULL, | |
6760 | NULL, | |
6761 | NULL, | |
6762 | NULL, | |
f4abbc16 | 6763 | NULL, |
9accd112 | 6764 | #endif |
c2d6af84 | 6765 | linux_supports_range_stepping, |
e57f1de3 | 6766 | linux_proc_pid_to_exec_file, |
14d2069a GB |
6767 | linux_mntns_open_cloexec, |
6768 | linux_mntns_unlink, | |
6769 | linux_mntns_readlink, | |
ce3a066d DJ |
6770 | }; |
6771 | ||
0d62e5e8 DJ |
6772 | static void |
6773 | linux_init_signals () | |
6774 | { | |
6775 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6776 | to find what the cancel signal actually is. */ | |
1a981360 | 6777 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6778 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6779 | #endif |
0d62e5e8 DJ |
6780 | } |
6781 | ||
3aee8918 PA |
6782 | #ifdef HAVE_LINUX_REGSETS |
6783 | void | |
6784 | initialize_regsets_info (struct regsets_info *info) | |
6785 | { | |
6786 | for (info->num_regsets = 0; | |
6787 | info->regsets[info->num_regsets].size >= 0; | |
6788 | info->num_regsets++) | |
6789 | ; | |
3aee8918 PA |
6790 | } |
6791 | #endif | |
6792 | ||
da6d8c04 DJ |
6793 | void |
6794 | initialize_low (void) | |
6795 | { | |
bd99dc85 PA |
6796 | struct sigaction sigchld_action; |
6797 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6798 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6799 | set_breakpoint_data (the_low_target.breakpoint, |
6800 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6801 | linux_init_signals (); |
aa7c7447 | 6802 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6803 | |
6804 | sigchld_action.sa_handler = sigchld_handler; | |
6805 | sigemptyset (&sigchld_action.sa_mask); | |
6806 | sigchld_action.sa_flags = SA_RESTART; | |
6807 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6808 | |
6809 | initialize_low_arch (); | |
89245bc0 DB |
6810 | |
6811 | linux_check_ptrace_features (); | |
da6d8c04 | 6812 | } |