Commit | Line | Data |
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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 | ||
1a981360 PA |
73 | /* This is the kernel's hard limit. Not to be confused with |
74 | SIGRTMIN. */ | |
75 | #ifndef __SIGRTMIN | |
76 | #define __SIGRTMIN 32 | |
77 | #endif | |
78 | ||
db0dfaa0 LM |
79 | /* Some targets did not define these ptrace constants from the start, |
80 | so gdbserver defines them locally here. In the future, these may | |
81 | be removed after they are added to asm/ptrace.h. */ | |
82 | #if !(defined(PT_TEXT_ADDR) \ | |
83 | || defined(PT_DATA_ADDR) \ | |
84 | || defined(PT_TEXT_END_ADDR)) | |
85 | #if defined(__mcoldfire__) | |
86 | /* These are still undefined in 3.10 kernels. */ | |
87 | #define PT_TEXT_ADDR 49*4 | |
88 | #define PT_DATA_ADDR 50*4 | |
89 | #define PT_TEXT_END_ADDR 51*4 | |
90 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
91 | #elif defined(BFIN) | |
92 | #define PT_TEXT_ADDR 220 | |
93 | #define PT_TEXT_END_ADDR 224 | |
94 | #define PT_DATA_ADDR 228 | |
95 | /* These are still undefined in 3.10 kernels. */ | |
96 | #elif defined(__TMS320C6X__) | |
97 | #define PT_TEXT_ADDR (0x10000*4) | |
98 | #define PT_DATA_ADDR (0x10004*4) | |
99 | #define PT_TEXT_END_ADDR (0x10008*4) | |
100 | #endif | |
101 | #endif | |
102 | ||
9accd112 | 103 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 104 | # include "nat/linux-btrace.h" |
734b0e4b | 105 | # include "btrace-common.h" |
9accd112 MM |
106 | #endif |
107 | ||
8365dcf5 TJB |
108 | #ifndef HAVE_ELF32_AUXV_T |
109 | /* Copied from glibc's elf.h. */ | |
110 | typedef struct | |
111 | { | |
112 | uint32_t a_type; /* Entry type */ | |
113 | union | |
114 | { | |
115 | uint32_t a_val; /* Integer value */ | |
116 | /* We use to have pointer elements added here. We cannot do that, | |
117 | though, since it does not work when using 32-bit definitions | |
118 | on 64-bit platforms and vice versa. */ | |
119 | } a_un; | |
120 | } Elf32_auxv_t; | |
121 | #endif | |
122 | ||
123 | #ifndef HAVE_ELF64_AUXV_T | |
124 | /* Copied from glibc's elf.h. */ | |
125 | typedef struct | |
126 | { | |
127 | uint64_t a_type; /* Entry type */ | |
128 | union | |
129 | { | |
130 | uint64_t a_val; /* Integer value */ | |
131 | /* We use to have pointer elements added here. We cannot do that, | |
132 | though, since it does not work when using 32-bit definitions | |
133 | on 64-bit platforms and vice versa. */ | |
134 | } a_un; | |
135 | } Elf64_auxv_t; | |
136 | #endif | |
137 | ||
ded48a5e YQ |
138 | /* Does the current host support PTRACE_GETREGSET? */ |
139 | int have_ptrace_getregset = -1; | |
140 | ||
cff068da GB |
141 | /* LWP accessors. */ |
142 | ||
143 | /* See nat/linux-nat.h. */ | |
144 | ||
145 | ptid_t | |
146 | ptid_of_lwp (struct lwp_info *lwp) | |
147 | { | |
148 | return ptid_of (get_lwp_thread (lwp)); | |
149 | } | |
150 | ||
151 | /* See nat/linux-nat.h. */ | |
152 | ||
4b134ca1 GB |
153 | void |
154 | lwp_set_arch_private_info (struct lwp_info *lwp, | |
155 | struct arch_lwp_info *info) | |
156 | { | |
157 | lwp->arch_private = info; | |
158 | } | |
159 | ||
160 | /* See nat/linux-nat.h. */ | |
161 | ||
162 | struct arch_lwp_info * | |
163 | lwp_arch_private_info (struct lwp_info *lwp) | |
164 | { | |
165 | return lwp->arch_private; | |
166 | } | |
167 | ||
168 | /* See nat/linux-nat.h. */ | |
169 | ||
cff068da GB |
170 | int |
171 | lwp_is_stopped (struct lwp_info *lwp) | |
172 | { | |
173 | return lwp->stopped; | |
174 | } | |
175 | ||
176 | /* See nat/linux-nat.h. */ | |
177 | ||
178 | enum target_stop_reason | |
179 | lwp_stop_reason (struct lwp_info *lwp) | |
180 | { | |
181 | return lwp->stop_reason; | |
182 | } | |
183 | ||
05044653 PA |
184 | /* A list of all unknown processes which receive stop signals. Some |
185 | other process will presumably claim each of these as forked | |
186 | children momentarily. */ | |
24a09b5f | 187 | |
05044653 PA |
188 | struct simple_pid_list |
189 | { | |
190 | /* The process ID. */ | |
191 | int pid; | |
192 | ||
193 | /* The status as reported by waitpid. */ | |
194 | int status; | |
195 | ||
196 | /* Next in chain. */ | |
197 | struct simple_pid_list *next; | |
198 | }; | |
199 | struct simple_pid_list *stopped_pids; | |
200 | ||
201 | /* Trivial list manipulation functions to keep track of a list of new | |
202 | stopped processes. */ | |
203 | ||
204 | static void | |
205 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
206 | { | |
8d749320 | 207 | struct simple_pid_list *new_pid = XNEW (struct simple_pid_list); |
05044653 PA |
208 | |
209 | new_pid->pid = pid; | |
210 | new_pid->status = status; | |
211 | new_pid->next = *listp; | |
212 | *listp = new_pid; | |
213 | } | |
214 | ||
215 | static int | |
216 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
217 | { | |
218 | struct simple_pid_list **p; | |
219 | ||
220 | for (p = listp; *p != NULL; p = &(*p)->next) | |
221 | if ((*p)->pid == pid) | |
222 | { | |
223 | struct simple_pid_list *next = (*p)->next; | |
224 | ||
225 | *statusp = (*p)->status; | |
226 | xfree (*p); | |
227 | *p = next; | |
228 | return 1; | |
229 | } | |
230 | return 0; | |
231 | } | |
24a09b5f | 232 | |
bde24c0a PA |
233 | enum stopping_threads_kind |
234 | { | |
235 | /* Not stopping threads presently. */ | |
236 | NOT_STOPPING_THREADS, | |
237 | ||
238 | /* Stopping threads. */ | |
239 | STOPPING_THREADS, | |
240 | ||
241 | /* Stopping and suspending threads. */ | |
242 | STOPPING_AND_SUSPENDING_THREADS | |
243 | }; | |
244 | ||
245 | /* This is set while stop_all_lwps is in effect. */ | |
246 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
247 | |
248 | /* FIXME make into a target method? */ | |
24a09b5f | 249 | int using_threads = 1; |
24a09b5f | 250 | |
fa593d66 PA |
251 | /* True if we're presently stabilizing threads (moving them out of |
252 | jump pads). */ | |
253 | static int stabilizing_threads; | |
254 | ||
2acc282a | 255 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 256 | int step, int signal, siginfo_t *info); |
2bd7c093 | 257 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
258 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
259 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
260 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
261 | int *wstat, int options); | |
95954743 | 262 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 263 | static struct lwp_info *add_lwp (ptid_t ptid); |
94585166 | 264 | static void linux_mourn (struct process_info *process); |
c35fafde | 265 | static int linux_stopped_by_watchpoint (void); |
95954743 | 266 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
00db26fa | 267 | static int lwp_is_marked_dead (struct lwp_info *lwp); |
d50171e4 | 268 | static void proceed_all_lwps (void); |
d50171e4 | 269 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 | 270 | static int kill_lwp (unsigned long lwpid, int signo); |
863d01bd PA |
271 | static void enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info); |
272 | static void complete_ongoing_step_over (void); | |
d50171e4 | 273 | |
582511be PA |
274 | /* When the event-loop is doing a step-over, this points at the thread |
275 | being stepped. */ | |
276 | ptid_t step_over_bkpt; | |
277 | ||
d50171e4 PA |
278 | /* True if the low target can hardware single-step. Such targets |
279 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
280 | ||
281 | static int | |
282 | can_hardware_single_step (void) | |
283 | { | |
284 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
285 | } | |
286 | ||
287 | /* True if the low target supports memory breakpoints. If so, we'll | |
288 | have a GET_PC implementation. */ | |
289 | ||
290 | static int | |
291 | supports_breakpoints (void) | |
292 | { | |
293 | return (the_low_target.get_pc != NULL); | |
294 | } | |
0d62e5e8 | 295 | |
fa593d66 PA |
296 | /* Returns true if this target can support fast tracepoints. This |
297 | does not mean that the in-process agent has been loaded in the | |
298 | inferior. */ | |
299 | ||
300 | static int | |
301 | supports_fast_tracepoints (void) | |
302 | { | |
303 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
304 | } | |
305 | ||
c2d6af84 PA |
306 | /* True if LWP is stopped in its stepping range. */ |
307 | ||
308 | static int | |
309 | lwp_in_step_range (struct lwp_info *lwp) | |
310 | { | |
311 | CORE_ADDR pc = lwp->stop_pc; | |
312 | ||
313 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
314 | } | |
315 | ||
0d62e5e8 DJ |
316 | struct pending_signals |
317 | { | |
318 | int signal; | |
32ca6d61 | 319 | siginfo_t info; |
0d62e5e8 DJ |
320 | struct pending_signals *prev; |
321 | }; | |
611cb4a5 | 322 | |
bd99dc85 PA |
323 | /* The read/write ends of the pipe registered as waitable file in the |
324 | event loop. */ | |
325 | static int linux_event_pipe[2] = { -1, -1 }; | |
326 | ||
327 | /* True if we're currently in async mode. */ | |
328 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
329 | ||
02fc4de7 | 330 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 331 | static void wait_for_sigstop (void); |
bd99dc85 | 332 | |
d0722149 DE |
333 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
334 | ||
335 | static int | |
214d508e | 336 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 337 | { |
214d508e L |
338 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
339 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
340 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
341 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
342 | { | |
343 | *machine = header->e_machine; | |
344 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
345 | ||
346 | } | |
347 | *machine = EM_NONE; | |
348 | return -1; | |
d0722149 DE |
349 | } |
350 | ||
351 | /* Return non-zero if FILE is a 64-bit ELF file, | |
352 | zero if the file is not a 64-bit ELF file, | |
353 | and -1 if the file is not accessible or doesn't exist. */ | |
354 | ||
be07f1a2 | 355 | static int |
214d508e | 356 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 357 | { |
957f3f49 | 358 | Elf64_Ehdr header; |
d0722149 DE |
359 | int fd; |
360 | ||
361 | fd = open (file, O_RDONLY); | |
362 | if (fd < 0) | |
363 | return -1; | |
364 | ||
365 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
366 | { | |
367 | close (fd); | |
368 | return 0; | |
369 | } | |
370 | close (fd); | |
371 | ||
214d508e | 372 | return elf_64_header_p (&header, machine); |
d0722149 DE |
373 | } |
374 | ||
be07f1a2 PA |
375 | /* Accepts an integer PID; Returns true if the executable PID is |
376 | running is a 64-bit ELF file.. */ | |
377 | ||
378 | int | |
214d508e | 379 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 380 | { |
d8d2a3ee | 381 | char file[PATH_MAX]; |
be07f1a2 PA |
382 | |
383 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 384 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
385 | } |
386 | ||
bd99dc85 PA |
387 | static void |
388 | delete_lwp (struct lwp_info *lwp) | |
389 | { | |
fa96cb38 PA |
390 | struct thread_info *thr = get_lwp_thread (lwp); |
391 | ||
392 | if (debug_threads) | |
393 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
394 | ||
395 | remove_thread (thr); | |
aa5ca48f | 396 | free (lwp->arch_private); |
bd99dc85 PA |
397 | free (lwp); |
398 | } | |
399 | ||
95954743 PA |
400 | /* Add a process to the common process list, and set its private |
401 | data. */ | |
402 | ||
403 | static struct process_info * | |
404 | linux_add_process (int pid, int attached) | |
405 | { | |
406 | struct process_info *proc; | |
407 | ||
95954743 | 408 | proc = add_process (pid, attached); |
8d749320 | 409 | proc->priv = XCNEW (struct process_info_private); |
95954743 | 410 | |
aa5ca48f | 411 | if (the_low_target.new_process != NULL) |
fe978cb0 | 412 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 413 | |
95954743 PA |
414 | return proc; |
415 | } | |
416 | ||
582511be PA |
417 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
418 | ||
94585166 DB |
419 | /* Implement the arch_setup target_ops method. */ |
420 | ||
421 | static void | |
422 | linux_arch_setup (void) | |
423 | { | |
424 | the_low_target.arch_setup (); | |
425 | } | |
426 | ||
427 | /* Call the target arch_setup function on THREAD. */ | |
428 | ||
429 | static void | |
430 | linux_arch_setup_thread (struct thread_info *thread) | |
431 | { | |
432 | struct thread_info *saved_thread; | |
433 | ||
434 | saved_thread = current_thread; | |
435 | current_thread = thread; | |
436 | ||
437 | linux_arch_setup (); | |
438 | ||
439 | current_thread = saved_thread; | |
440 | } | |
441 | ||
442 | /* Handle a GNU/Linux extended wait response. If we see a clone, | |
443 | fork, or vfork event, we need to add the new LWP to our list | |
444 | (and return 0 so as not to report the trap to higher layers). | |
445 | If we see an exec event, we will modify ORIG_EVENT_LWP to point | |
446 | to a new LWP representing the new program. */ | |
0d62e5e8 | 447 | |
de0d863e | 448 | static int |
94585166 | 449 | handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat) |
24a09b5f | 450 | { |
94585166 | 451 | struct lwp_info *event_lwp = *orig_event_lwp; |
89a5711c | 452 | int event = linux_ptrace_get_extended_event (wstat); |
de0d863e | 453 | struct thread_info *event_thr = get_lwp_thread (event_lwp); |
54a0b537 | 454 | struct lwp_info *new_lwp; |
24a09b5f | 455 | |
c269dbdb DB |
456 | if ((event == PTRACE_EVENT_FORK) || (event == PTRACE_EVENT_VFORK) |
457 | || (event == PTRACE_EVENT_CLONE)) | |
24a09b5f | 458 | { |
95954743 | 459 | ptid_t ptid; |
24a09b5f | 460 | unsigned long new_pid; |
05044653 | 461 | int ret, status; |
24a09b5f | 462 | |
de0d863e | 463 | /* Get the pid of the new lwp. */ |
d86d4aaf | 464 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 465 | &new_pid); |
24a09b5f DJ |
466 | |
467 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 468 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
469 | { |
470 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
471 | hits the SIGSTOP, but we're already attached. */ | |
472 | ||
97438e3f | 473 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
474 | |
475 | if (ret == -1) | |
476 | perror_with_name ("waiting for new child"); | |
477 | else if (ret != new_pid) | |
478 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 479 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
480 | warning ("wait returned unexpected status 0x%x", status); |
481 | } | |
482 | ||
c269dbdb | 483 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK) |
de0d863e DB |
484 | { |
485 | struct process_info *parent_proc; | |
486 | struct process_info *child_proc; | |
487 | struct lwp_info *child_lwp; | |
bfacd19d | 488 | struct thread_info *child_thr; |
de0d863e DB |
489 | struct target_desc *tdesc; |
490 | ||
491 | ptid = ptid_build (new_pid, new_pid, 0); | |
492 | ||
493 | if (debug_threads) | |
494 | { | |
495 | debug_printf ("HEW: Got fork event from LWP %ld, " | |
496 | "new child is %d\n", | |
497 | ptid_get_lwp (ptid_of (event_thr)), | |
498 | ptid_get_pid (ptid)); | |
499 | } | |
500 | ||
501 | /* Add the new process to the tables and clone the breakpoint | |
502 | lists of the parent. We need to do this even if the new process | |
503 | will be detached, since we will need the process object and the | |
504 | breakpoints to remove any breakpoints from memory when we | |
505 | detach, and the client side will access registers. */ | |
506 | child_proc = linux_add_process (new_pid, 0); | |
507 | gdb_assert (child_proc != NULL); | |
508 | child_lwp = add_lwp (ptid); | |
509 | gdb_assert (child_lwp != NULL); | |
510 | child_lwp->stopped = 1; | |
bfacd19d DB |
511 | child_lwp->must_set_ptrace_flags = 1; |
512 | child_lwp->status_pending_p = 0; | |
513 | child_thr = get_lwp_thread (child_lwp); | |
514 | child_thr->last_resume_kind = resume_stop; | |
998d452a PA |
515 | child_thr->last_status.kind = TARGET_WAITKIND_STOPPED; |
516 | ||
863d01bd PA |
517 | /* If we're suspending all threads, leave this one suspended |
518 | too. */ | |
519 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
520 | { | |
521 | if (debug_threads) | |
522 | debug_printf ("HEW: leaving child suspended\n"); | |
523 | child_lwp->suspended = 1; | |
524 | } | |
525 | ||
de0d863e DB |
526 | parent_proc = get_thread_process (event_thr); |
527 | child_proc->attached = parent_proc->attached; | |
528 | clone_all_breakpoints (&child_proc->breakpoints, | |
529 | &child_proc->raw_breakpoints, | |
530 | parent_proc->breakpoints); | |
531 | ||
8d749320 | 532 | tdesc = XNEW (struct target_desc); |
de0d863e DB |
533 | copy_target_description (tdesc, parent_proc->tdesc); |
534 | child_proc->tdesc = tdesc; | |
de0d863e | 535 | |
3a8a0396 DB |
536 | /* Clone arch-specific process data. */ |
537 | if (the_low_target.new_fork != NULL) | |
538 | the_low_target.new_fork (parent_proc, child_proc); | |
539 | ||
de0d863e | 540 | /* Save fork info in the parent thread. */ |
c269dbdb DB |
541 | if (event == PTRACE_EVENT_FORK) |
542 | event_lwp->waitstatus.kind = TARGET_WAITKIND_FORKED; | |
543 | else if (event == PTRACE_EVENT_VFORK) | |
544 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORKED; | |
545 | ||
de0d863e | 546 | event_lwp->waitstatus.value.related_pid = ptid; |
c269dbdb | 547 | |
de0d863e DB |
548 | /* The status_pending field contains bits denoting the |
549 | extended event, so when the pending event is handled, | |
550 | the handler will look at lwp->waitstatus. */ | |
551 | event_lwp->status_pending_p = 1; | |
552 | event_lwp->status_pending = wstat; | |
553 | ||
554 | /* Report the event. */ | |
555 | return 0; | |
556 | } | |
557 | ||
fa96cb38 PA |
558 | if (debug_threads) |
559 | debug_printf ("HEW: Got clone event " | |
560 | "from LWP %ld, new child is LWP %ld\n", | |
561 | lwpid_of (event_thr), new_pid); | |
562 | ||
d86d4aaf | 563 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 564 | new_lwp = add_lwp (ptid); |
24a09b5f | 565 | |
e27d73f6 DE |
566 | /* Either we're going to immediately resume the new thread |
567 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
568 | thinks the thread is currently running, so set this first | |
569 | before calling linux_resume_one_lwp. */ | |
570 | new_lwp->stopped = 1; | |
571 | ||
bde24c0a PA |
572 | /* If we're suspending all threads, leave this one suspended |
573 | too. */ | |
574 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
575 | new_lwp->suspended = 1; | |
576 | ||
da5898ce DJ |
577 | /* Normally we will get the pending SIGSTOP. But in some cases |
578 | we might get another signal delivered to the group first. | |
f21cc1a2 | 579 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 580 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 581 | { |
54a0b537 | 582 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
583 | new_lwp->status_pending_p = 1; |
584 | new_lwp->status_pending = status; | |
da5898ce | 585 | } |
de0d863e DB |
586 | |
587 | /* Don't report the event. */ | |
588 | return 1; | |
24a09b5f | 589 | } |
c269dbdb DB |
590 | else if (event == PTRACE_EVENT_VFORK_DONE) |
591 | { | |
592 | event_lwp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
593 | ||
594 | /* Report the event. */ | |
595 | return 0; | |
596 | } | |
94585166 DB |
597 | else if (event == PTRACE_EVENT_EXEC && report_exec_events) |
598 | { | |
599 | struct process_info *proc; | |
600 | ptid_t event_ptid; | |
601 | pid_t event_pid; | |
602 | ||
603 | if (debug_threads) | |
604 | { | |
605 | debug_printf ("HEW: Got exec event from LWP %ld\n", | |
606 | lwpid_of (event_thr)); | |
607 | } | |
608 | ||
609 | /* Get the event ptid. */ | |
610 | event_ptid = ptid_of (event_thr); | |
611 | event_pid = ptid_get_pid (event_ptid); | |
612 | ||
613 | /* Delete the execing process and all its threads. */ | |
614 | proc = get_thread_process (event_thr); | |
615 | linux_mourn (proc); | |
616 | current_thread = NULL; | |
617 | ||
618 | /* Create a new process/lwp/thread. */ | |
619 | proc = linux_add_process (event_pid, 0); | |
620 | event_lwp = add_lwp (event_ptid); | |
621 | event_thr = get_lwp_thread (event_lwp); | |
622 | gdb_assert (current_thread == event_thr); | |
623 | linux_arch_setup_thread (event_thr); | |
624 | ||
625 | /* Set the event status. */ | |
626 | event_lwp->waitstatus.kind = TARGET_WAITKIND_EXECD; | |
627 | event_lwp->waitstatus.value.execd_pathname | |
628 | = xstrdup (linux_proc_pid_to_exec_file (lwpid_of (event_thr))); | |
629 | ||
630 | /* Mark the exec status as pending. */ | |
631 | event_lwp->stopped = 1; | |
632 | event_lwp->status_pending_p = 1; | |
633 | event_lwp->status_pending = wstat; | |
634 | event_thr->last_resume_kind = resume_continue; | |
635 | event_thr->last_status.kind = TARGET_WAITKIND_IGNORE; | |
636 | ||
637 | /* Report the event. */ | |
638 | *orig_event_lwp = event_lwp; | |
639 | return 0; | |
640 | } | |
de0d863e DB |
641 | |
642 | internal_error (__FILE__, __LINE__, _("unknown ptrace event %d"), event); | |
24a09b5f DJ |
643 | } |
644 | ||
d50171e4 PA |
645 | /* Return the PC as read from the regcache of LWP, without any |
646 | adjustment. */ | |
647 | ||
648 | static CORE_ADDR | |
649 | get_pc (struct lwp_info *lwp) | |
650 | { | |
0bfdf32f | 651 | struct thread_info *saved_thread; |
d50171e4 PA |
652 | struct regcache *regcache; |
653 | CORE_ADDR pc; | |
654 | ||
655 | if (the_low_target.get_pc == NULL) | |
656 | return 0; | |
657 | ||
0bfdf32f GB |
658 | saved_thread = current_thread; |
659 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 660 | |
0bfdf32f | 661 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
662 | pc = (*the_low_target.get_pc) (regcache); |
663 | ||
664 | if (debug_threads) | |
87ce2a04 | 665 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 666 | |
0bfdf32f | 667 | current_thread = saved_thread; |
d50171e4 PA |
668 | return pc; |
669 | } | |
670 | ||
671 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
672 | The SIGTRAP could mean several things. |
673 | ||
674 | On i386, where decr_pc_after_break is non-zero: | |
582511be PA |
675 | |
676 | If we were single-stepping this process using PTRACE_SINGLESTEP, we | |
677 | will get only the one SIGTRAP. The value of $eip will be the next | |
678 | instruction. If the instruction we stepped over was a breakpoint, | |
679 | we need to decrement the PC. | |
680 | ||
0d62e5e8 DJ |
681 | If we continue the process using PTRACE_CONT, we will get a |
682 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
683 | the instruction after the breakpoint (i.e. needs to be | |
684 | decremented). If we report the SIGTRAP to GDB, we must also | |
582511be | 685 | report the undecremented PC. If the breakpoint is removed, we |
0d62e5e8 DJ |
686 | must resume at the decremented PC. |
687 | ||
582511be PA |
688 | On a non-decr_pc_after_break machine with hardware or kernel |
689 | single-step: | |
690 | ||
691 | If we either single-step a breakpoint instruction, or continue and | |
692 | hit a breakpoint instruction, our PC will point at the breakpoint | |
0d62e5e8 DJ |
693 | instruction. */ |
694 | ||
582511be PA |
695 | static int |
696 | check_stopped_by_breakpoint (struct lwp_info *lwp) | |
0d62e5e8 | 697 | { |
582511be PA |
698 | CORE_ADDR pc; |
699 | CORE_ADDR sw_breakpoint_pc; | |
700 | struct thread_info *saved_thread; | |
3e572f71 PA |
701 | #if USE_SIGTRAP_SIGINFO |
702 | siginfo_t siginfo; | |
703 | #endif | |
d50171e4 PA |
704 | |
705 | if (the_low_target.get_pc == NULL) | |
706 | return 0; | |
0d62e5e8 | 707 | |
582511be PA |
708 | pc = get_pc (lwp); |
709 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 710 | |
582511be PA |
711 | /* breakpoint_at reads from the current thread. */ |
712 | saved_thread = current_thread; | |
713 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 714 | |
3e572f71 PA |
715 | #if USE_SIGTRAP_SIGINFO |
716 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
717 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
718 | { | |
719 | if (siginfo.si_signo == SIGTRAP) | |
720 | { | |
1db33b5a | 721 | if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)) |
3e572f71 PA |
722 | { |
723 | if (debug_threads) | |
724 | { | |
725 | struct thread_info *thr = get_lwp_thread (lwp); | |
726 | ||
2bf6fb9d | 727 | debug_printf ("CSBB: %s stopped by software breakpoint\n", |
3e572f71 PA |
728 | target_pid_to_str (ptid_of (thr))); |
729 | } | |
730 | ||
731 | /* Back up the PC if necessary. */ | |
732 | if (pc != sw_breakpoint_pc) | |
733 | { | |
734 | struct regcache *regcache | |
735 | = get_thread_regcache (current_thread, 1); | |
736 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
737 | } | |
738 | ||
739 | lwp->stop_pc = sw_breakpoint_pc; | |
740 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
741 | current_thread = saved_thread; | |
742 | return 1; | |
743 | } | |
744 | else if (siginfo.si_code == TRAP_HWBKPT) | |
745 | { | |
746 | if (debug_threads) | |
747 | { | |
748 | struct thread_info *thr = get_lwp_thread (lwp); | |
749 | ||
2bf6fb9d PA |
750 | debug_printf ("CSBB: %s stopped by hardware " |
751 | "breakpoint/watchpoint\n", | |
3e572f71 PA |
752 | target_pid_to_str (ptid_of (thr))); |
753 | } | |
754 | ||
755 | lwp->stop_pc = pc; | |
756 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
757 | current_thread = saved_thread; | |
758 | return 1; | |
759 | } | |
2bf6fb9d PA |
760 | else if (siginfo.si_code == TRAP_TRACE) |
761 | { | |
762 | if (debug_threads) | |
763 | { | |
764 | struct thread_info *thr = get_lwp_thread (lwp); | |
765 | ||
766 | debug_printf ("CSBB: %s stopped by trace\n", | |
767 | target_pid_to_str (ptid_of (thr))); | |
768 | } | |
863d01bd PA |
769 | |
770 | lwp->stop_reason = TARGET_STOPPED_BY_SINGLE_STEP; | |
2bf6fb9d | 771 | } |
3e572f71 PA |
772 | } |
773 | } | |
774 | #else | |
582511be PA |
775 | /* We may have just stepped a breakpoint instruction. E.g., in |
776 | non-stop mode, GDB first tells the thread A to step a range, and | |
777 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
778 | case we need to report the breakpoint PC. */ |
779 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be PA |
780 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
781 | { | |
782 | if (debug_threads) | |
783 | { | |
784 | struct thread_info *thr = get_lwp_thread (lwp); | |
785 | ||
786 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
787 | target_pid_to_str (ptid_of (thr))); | |
788 | } | |
789 | ||
790 | /* Back up the PC if necessary. */ | |
791 | if (pc != sw_breakpoint_pc) | |
792 | { | |
793 | struct regcache *regcache | |
794 | = get_thread_regcache (current_thread, 1); | |
795 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
796 | } | |
797 | ||
798 | lwp->stop_pc = sw_breakpoint_pc; | |
15c66dd6 | 799 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
582511be PA |
800 | current_thread = saved_thread; |
801 | return 1; | |
802 | } | |
803 | ||
804 | if (hardware_breakpoint_inserted_here (pc)) | |
805 | { | |
806 | if (debug_threads) | |
807 | { | |
808 | struct thread_info *thr = get_lwp_thread (lwp); | |
809 | ||
810 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
811 | target_pid_to_str (ptid_of (thr))); | |
812 | } | |
47c0c975 | 813 | |
582511be | 814 | lwp->stop_pc = pc; |
15c66dd6 | 815 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; |
582511be PA |
816 | current_thread = saved_thread; |
817 | return 1; | |
818 | } | |
3e572f71 | 819 | #endif |
582511be PA |
820 | |
821 | current_thread = saved_thread; | |
822 | return 0; | |
0d62e5e8 | 823 | } |
ce3a066d | 824 | |
b3312d80 | 825 | static struct lwp_info * |
95954743 | 826 | add_lwp (ptid_t ptid) |
611cb4a5 | 827 | { |
54a0b537 | 828 | struct lwp_info *lwp; |
0d62e5e8 | 829 | |
8d749320 | 830 | lwp = XCNEW (struct lwp_info); |
00db26fa PA |
831 | |
832 | lwp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
0d62e5e8 | 833 | |
aa5ca48f | 834 | if (the_low_target.new_thread != NULL) |
34c703da | 835 | the_low_target.new_thread (lwp); |
aa5ca48f | 836 | |
f7667f0d | 837 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 838 | |
54a0b537 | 839 | return lwp; |
0d62e5e8 | 840 | } |
611cb4a5 | 841 | |
da6d8c04 DJ |
842 | /* Start an inferior process and returns its pid. |
843 | ALLARGS is a vector of program-name and args. */ | |
844 | ||
ce3a066d DJ |
845 | static int |
846 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 847 | { |
a6dbe5df | 848 | struct lwp_info *new_lwp; |
da6d8c04 | 849 | int pid; |
95954743 | 850 | ptid_t ptid; |
8cc73a39 SDJ |
851 | struct cleanup *restore_personality |
852 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 853 | |
42c81e2a | 854 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
855 | pid = vfork (); |
856 | #else | |
da6d8c04 | 857 | pid = fork (); |
52fb6437 | 858 | #endif |
da6d8c04 DJ |
859 | if (pid < 0) |
860 | perror_with_name ("fork"); | |
861 | ||
862 | if (pid == 0) | |
863 | { | |
602e3198 | 864 | close_most_fds (); |
b8e1b30e | 865 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 866 | |
1a981360 | 867 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 868 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 869 | #endif |
0d62e5e8 | 870 | |
a9fa9f7d DJ |
871 | setpgid (0, 0); |
872 | ||
e0f9f062 DE |
873 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
874 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
875 | Also, redirect stdin to /dev/null. */ | |
876 | if (remote_connection_is_stdio ()) | |
877 | { | |
878 | close (0); | |
879 | open ("/dev/null", O_RDONLY); | |
880 | dup2 (2, 1); | |
3e52c33d JK |
881 | if (write (2, "stdin/stdout redirected\n", |
882 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
883 | { |
884 | /* Errors ignored. */; | |
885 | } | |
e0f9f062 DE |
886 | } |
887 | ||
2b876972 DJ |
888 | execv (program, allargs); |
889 | if (errno == ENOENT) | |
890 | execvp (program, allargs); | |
da6d8c04 DJ |
891 | |
892 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 893 | strerror (errno)); |
da6d8c04 DJ |
894 | fflush (stderr); |
895 | _exit (0177); | |
896 | } | |
897 | ||
8cc73a39 | 898 | do_cleanups (restore_personality); |
03583c20 | 899 | |
55d7b841 | 900 | linux_add_process (pid, 0); |
95954743 PA |
901 | |
902 | ptid = ptid_build (pid, pid, 0); | |
903 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 904 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 905 | |
a9fa9f7d | 906 | return pid; |
da6d8c04 DJ |
907 | } |
908 | ||
8784d563 PA |
909 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
910 | error. */ | |
da6d8c04 | 911 | |
7ae1a6a6 PA |
912 | int |
913 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 914 | { |
54a0b537 | 915 | struct lwp_info *new_lwp; |
7ae1a6a6 | 916 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 917 | |
b8e1b30e | 918 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 919 | != 0) |
7ae1a6a6 | 920 | return errno; |
24a09b5f | 921 | |
b3312d80 | 922 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 923 | |
a6dbe5df PA |
924 | /* We need to wait for SIGSTOP before being able to make the next |
925 | ptrace call on this LWP. */ | |
926 | new_lwp->must_set_ptrace_flags = 1; | |
927 | ||
644cebc9 | 928 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
929 | { |
930 | if (debug_threads) | |
87ce2a04 | 931 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
932 | |
933 | /* The process is definitely stopped. It is in a job control | |
934 | stop, unless the kernel predates the TASK_STOPPED / | |
935 | TASK_TRACED distinction, in which case it might be in a | |
936 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
937 | can kill it, signal it, et cetera. | |
938 | ||
939 | First make sure there is a pending SIGSTOP. Since we are | |
940 | already attached, the process can not transition from stopped | |
941 | to running without a PTRACE_CONT; so we know this signal will | |
942 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
943 | probably already in the queue (unless this kernel is old | |
944 | enough to use TASK_STOPPED for ptrace stops); but since | |
945 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
946 | kill_lwp (lwpid, SIGSTOP); | |
947 | ||
948 | /* Finally, resume the stopped process. This will deliver the | |
949 | SIGSTOP (or a higher priority signal, just like normal | |
950 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 951 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
952 | } |
953 | ||
0d62e5e8 | 954 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
955 | brings it to a halt. |
956 | ||
957 | There are several cases to consider here: | |
958 | ||
959 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 960 | of a new thread that is being created. |
d50171e4 PA |
961 | In this case we should ignore that SIGSTOP and resume the |
962 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 963 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 964 | resume_continue. |
0e21c1ec DE |
965 | |
966 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
967 | to it via attach_inferior. |
968 | In this case we want the process thread to stop. | |
d50171e4 PA |
969 | This is handled by having linux_attach set last_resume_kind == |
970 | resume_stop after we return. | |
e3deef73 LM |
971 | |
972 | If the pid we are attaching to is also the tgid, we attach to and | |
973 | stop all the existing threads. Otherwise, we attach to pid and | |
974 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
975 | |
976 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
977 | existing threads. |
978 | In this case we want the thread to stop. | |
979 | FIXME: This case is currently not properly handled. | |
980 | We should wait for the SIGSTOP but don't. Things work apparently | |
981 | because enough time passes between when we ptrace (ATTACH) and when | |
982 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
983 | |
984 | On the other hand, if we are currently trying to stop all threads, we | |
985 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 986 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
987 | end of the list, and so the new thread has not yet reached |
988 | wait_for_sigstop (but will). */ | |
d50171e4 | 989 | new_lwp->stop_expected = 1; |
0d62e5e8 | 990 | |
7ae1a6a6 | 991 | return 0; |
95954743 PA |
992 | } |
993 | ||
8784d563 PA |
994 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
995 | already attached. Returns true if a new LWP is found, false | |
996 | otherwise. */ | |
997 | ||
998 | static int | |
999 | attach_proc_task_lwp_callback (ptid_t ptid) | |
1000 | { | |
1001 | /* Is this a new thread? */ | |
1002 | if (find_thread_ptid (ptid) == NULL) | |
1003 | { | |
1004 | int lwpid = ptid_get_lwp (ptid); | |
1005 | int err; | |
1006 | ||
1007 | if (debug_threads) | |
1008 | debug_printf ("Found new lwp %d\n", lwpid); | |
1009 | ||
1010 | err = linux_attach_lwp (ptid); | |
1011 | ||
1012 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
1013 | is returned if the thread's task still exists, and is marked | |
1014 | as exited or zombie, as well as other conditions, so in that | |
1015 | case, confirm the status in /proc/PID/status. */ | |
1016 | if (err == ESRCH | |
1017 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
1018 | { | |
1019 | if (debug_threads) | |
1020 | { | |
1021 | debug_printf ("Cannot attach to lwp %d: " | |
1022 | "thread is gone (%d: %s)\n", | |
1023 | lwpid, err, strerror (err)); | |
1024 | } | |
1025 | } | |
1026 | else if (err != 0) | |
1027 | { | |
1028 | warning (_("Cannot attach to lwp %d: %s"), | |
1029 | lwpid, | |
1030 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
1031 | } | |
1032 | ||
1033 | return 1; | |
1034 | } | |
1035 | return 0; | |
1036 | } | |
1037 | ||
e3deef73 LM |
1038 | /* Attach to PID. If PID is the tgid, attach to it and all |
1039 | of its threads. */ | |
1040 | ||
c52daf70 | 1041 | static int |
a1928bad | 1042 | linux_attach (unsigned long pid) |
0d62e5e8 | 1043 | { |
7ae1a6a6 PA |
1044 | ptid_t ptid = ptid_build (pid, pid, 0); |
1045 | int err; | |
1046 | ||
e3deef73 LM |
1047 | /* Attach to PID. We will check for other threads |
1048 | soon. */ | |
7ae1a6a6 PA |
1049 | err = linux_attach_lwp (ptid); |
1050 | if (err != 0) | |
1051 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 1052 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 1053 | |
55d7b841 | 1054 | linux_add_process (pid, 1); |
0d62e5e8 | 1055 | |
bd99dc85 PA |
1056 | if (!non_stop) |
1057 | { | |
8336d594 PA |
1058 | struct thread_info *thread; |
1059 | ||
1060 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
1061 | process. It will be collected by wait shortly. */ | |
1062 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
1063 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 1064 | } |
0d62e5e8 | 1065 | |
8784d563 PA |
1066 | /* We must attach to every LWP. If /proc is mounted, use that to |
1067 | find them now. On the one hand, the inferior may be using raw | |
1068 | clone instead of using pthreads. On the other hand, even if it | |
1069 | is using pthreads, GDB may not be connected yet (thread_db needs | |
1070 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
1071 | structures in the inferior's address space to find the list of | |
1072 | threads/LWPs, and those structures may well be corrupted. Note | |
1073 | that once thread_db is loaded, we'll still use it to list threads | |
1074 | and associate pthread info with each LWP. */ | |
1075 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
95954743 PA |
1076 | return 0; |
1077 | } | |
1078 | ||
1079 | struct counter | |
1080 | { | |
1081 | int pid; | |
1082 | int count; | |
1083 | }; | |
1084 | ||
1085 | static int | |
1086 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
1087 | { | |
9a3c8263 | 1088 | struct counter *counter = (struct counter *) args; |
95954743 PA |
1089 | |
1090 | if (ptid_get_pid (entry->id) == counter->pid) | |
1091 | { | |
1092 | if (++counter->count > 1) | |
1093 | return 1; | |
1094 | } | |
d61ddec4 | 1095 | |
da6d8c04 DJ |
1096 | return 0; |
1097 | } | |
1098 | ||
95954743 | 1099 | static int |
fa96cb38 | 1100 | last_thread_of_process_p (int pid) |
95954743 | 1101 | { |
95954743 | 1102 | struct counter counter = { pid , 0 }; |
da6d8c04 | 1103 | |
95954743 PA |
1104 | return (find_inferior (&all_threads, |
1105 | second_thread_of_pid_p, &counter) == NULL); | |
1106 | } | |
1107 | ||
da84f473 PA |
1108 | /* Kill LWP. */ |
1109 | ||
1110 | static void | |
1111 | linux_kill_one_lwp (struct lwp_info *lwp) | |
1112 | { | |
d86d4aaf DE |
1113 | struct thread_info *thr = get_lwp_thread (lwp); |
1114 | int pid = lwpid_of (thr); | |
da84f473 PA |
1115 | |
1116 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
1117 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
1118 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
1119 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
1120 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
1121 | per process, not one for each thread. But since we still support | |
1122 | linuxthreads, and we also support debugging programs using raw | |
1123 | clone without CLONE_THREAD, we send one for each thread. For | |
1124 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
1125 | about some old kernels where PTRACE_KILL might work better | |
1126 | (dubious if there are any such, but that's why it's paranoia), so | |
1127 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
1128 | everywhere. */ | |
1129 | ||
1130 | errno = 0; | |
69ff6be5 | 1131 | kill_lwp (pid, SIGKILL); |
da84f473 | 1132 | if (debug_threads) |
ce9e3fe7 PA |
1133 | { |
1134 | int save_errno = errno; | |
1135 | ||
1136 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
1137 | target_pid_to_str (ptid_of (thr)), | |
1138 | save_errno ? strerror (save_errno) : "OK"); | |
1139 | } | |
da84f473 PA |
1140 | |
1141 | errno = 0; | |
b8e1b30e | 1142 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 1143 | if (debug_threads) |
ce9e3fe7 PA |
1144 | { |
1145 | int save_errno = errno; | |
1146 | ||
1147 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
1148 | target_pid_to_str (ptid_of (thr)), | |
1149 | save_errno ? strerror (save_errno) : "OK"); | |
1150 | } | |
da84f473 PA |
1151 | } |
1152 | ||
e76126e8 PA |
1153 | /* Kill LWP and wait for it to die. */ |
1154 | ||
1155 | static void | |
1156 | kill_wait_lwp (struct lwp_info *lwp) | |
1157 | { | |
1158 | struct thread_info *thr = get_lwp_thread (lwp); | |
1159 | int pid = ptid_get_pid (ptid_of (thr)); | |
1160 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
1161 | int wstat; | |
1162 | int res; | |
1163 | ||
1164 | if (debug_threads) | |
1165 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
1166 | ||
1167 | do | |
1168 | { | |
1169 | linux_kill_one_lwp (lwp); | |
1170 | ||
1171 | /* Make sure it died. Notes: | |
1172 | ||
1173 | - The loop is most likely unnecessary. | |
1174 | ||
1175 | - We don't use linux_wait_for_event as that could delete lwps | |
1176 | while we're iterating over them. We're not interested in | |
1177 | any pending status at this point, only in making sure all | |
1178 | wait status on the kernel side are collected until the | |
1179 | process is reaped. | |
1180 | ||
1181 | - We don't use __WALL here as the __WALL emulation relies on | |
1182 | SIGCHLD, and killing a stopped process doesn't generate | |
1183 | one, nor an exit status. | |
1184 | */ | |
1185 | res = my_waitpid (lwpid, &wstat, 0); | |
1186 | if (res == -1 && errno == ECHILD) | |
1187 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
1188 | } while (res > 0 && WIFSTOPPED (wstat)); | |
1189 | ||
586b02a9 PA |
1190 | /* Even if it was stopped, the child may have already disappeared. |
1191 | E.g., if it was killed by SIGKILL. */ | |
1192 | if (res < 0 && errno != ECHILD) | |
1193 | perror_with_name ("kill_wait_lwp"); | |
e76126e8 PA |
1194 | } |
1195 | ||
da84f473 PA |
1196 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
1197 | except the leader. */ | |
95954743 PA |
1198 | |
1199 | static int | |
da84f473 | 1200 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 1201 | { |
0d62e5e8 | 1202 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 1203 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
1204 | int pid = * (int *) args; |
1205 | ||
1206 | if (ptid_get_pid (entry->id) != pid) | |
1207 | return 0; | |
0d62e5e8 | 1208 | |
fd500816 DJ |
1209 | /* We avoid killing the first thread here, because of a Linux kernel (at |
1210 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
1211 | the children get a chance to be reaped, it will remain a zombie | |
1212 | forever. */ | |
95954743 | 1213 | |
d86d4aaf | 1214 | if (lwpid_of (thread) == pid) |
95954743 PA |
1215 | { |
1216 | if (debug_threads) | |
87ce2a04 DE |
1217 | debug_printf ("lkop: is last of process %s\n", |
1218 | target_pid_to_str (entry->id)); | |
95954743 PA |
1219 | return 0; |
1220 | } | |
fd500816 | 1221 | |
e76126e8 | 1222 | kill_wait_lwp (lwp); |
95954743 | 1223 | return 0; |
da6d8c04 DJ |
1224 | } |
1225 | ||
95954743 PA |
1226 | static int |
1227 | linux_kill (int pid) | |
0d62e5e8 | 1228 | { |
95954743 | 1229 | struct process_info *process; |
54a0b537 | 1230 | struct lwp_info *lwp; |
fd500816 | 1231 | |
95954743 PA |
1232 | process = find_process_pid (pid); |
1233 | if (process == NULL) | |
1234 | return -1; | |
9d606399 | 1235 | |
f9e39928 PA |
1236 | /* If we're killing a running inferior, make sure it is stopped |
1237 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1238 | stop_all_lwps (0, NULL); |
f9e39928 | 1239 | |
da84f473 | 1240 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1241 | |
54a0b537 | 1242 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1243 | thread in the list, so do so now. */ |
95954743 | 1244 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1245 | |
784867a5 | 1246 | if (lwp == NULL) |
fd500816 | 1247 | { |
784867a5 | 1248 | if (debug_threads) |
d86d4aaf DE |
1249 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1250 | pid); | |
784867a5 JK |
1251 | } |
1252 | else | |
e76126e8 | 1253 | kill_wait_lwp (lwp); |
2d717e4f | 1254 | |
8336d594 | 1255 | the_target->mourn (process); |
f9e39928 PA |
1256 | |
1257 | /* Since we presently can only stop all lwps of all processes, we | |
1258 | need to unstop lwps of other processes. */ | |
7984d532 | 1259 | unstop_all_lwps (0, NULL); |
95954743 | 1260 | return 0; |
0d62e5e8 DJ |
1261 | } |
1262 | ||
9b224c5e PA |
1263 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1264 | signal the thread last stopped for, which we need to deliver to the | |
1265 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1266 | ||
1267 | static int | |
1268 | get_detach_signal (struct thread_info *thread) | |
1269 | { | |
a493e3e2 | 1270 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1271 | int status; |
1272 | struct lwp_info *lp = get_thread_lwp (thread); | |
1273 | ||
1274 | if (lp->status_pending_p) | |
1275 | status = lp->status_pending; | |
1276 | else | |
1277 | { | |
1278 | /* If the thread had been suspended by gdbserver, and it stopped | |
1279 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1280 | want to deliver that SIGSTOP. */ | |
1281 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1282 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1283 | return 0; |
1284 | ||
1285 | /* Otherwise, we may need to deliver the signal we | |
1286 | intercepted. */ | |
1287 | status = lp->last_status; | |
1288 | } | |
1289 | ||
1290 | if (!WIFSTOPPED (status)) | |
1291 | { | |
1292 | if (debug_threads) | |
87ce2a04 | 1293 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1294 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1295 | return 0; |
1296 | } | |
1297 | ||
1298 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1299 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1300 | { |
1301 | if (debug_threads) | |
87ce2a04 DE |
1302 | debug_printf ("GPS: lwp %s had stopped with extended " |
1303 | "status: no pending signal\n", | |
d86d4aaf | 1304 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1305 | return 0; |
1306 | } | |
1307 | ||
2ea28649 | 1308 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1309 | |
1310 | if (program_signals_p && !program_signals[signo]) | |
1311 | { | |
1312 | if (debug_threads) | |
87ce2a04 | 1313 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1314 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1315 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1316 | return 0; |
1317 | } | |
1318 | else if (!program_signals_p | |
1319 | /* If we have no way to know which signals GDB does not | |
1320 | want to have passed to the program, assume | |
1321 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1322 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1323 | { |
1324 | if (debug_threads) | |
87ce2a04 DE |
1325 | debug_printf ("GPS: lwp %s had signal %s, " |
1326 | "but we don't know if we should pass it. " | |
1327 | "Default to not.\n", | |
d86d4aaf | 1328 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1329 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1330 | return 0; |
1331 | } | |
1332 | else | |
1333 | { | |
1334 | if (debug_threads) | |
87ce2a04 | 1335 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1336 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1337 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1338 | |
1339 | return WSTOPSIG (status); | |
1340 | } | |
1341 | } | |
1342 | ||
95954743 PA |
1343 | static int |
1344 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1345 | { |
1346 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1347 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1348 | int pid = * (int *) args; |
9b224c5e | 1349 | int sig; |
95954743 PA |
1350 | |
1351 | if (ptid_get_pid (entry->id) != pid) | |
1352 | return 0; | |
6ad8ae5c | 1353 | |
9b224c5e | 1354 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1355 | if (lwp->stop_expected) |
ae13219e | 1356 | { |
9b224c5e | 1357 | if (debug_threads) |
87ce2a04 | 1358 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1359 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1360 | |
d86d4aaf | 1361 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1362 | lwp->stop_expected = 0; |
ae13219e DJ |
1363 | } |
1364 | ||
1365 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1366 | regcache_invalidate_thread (thread); |
ae13219e | 1367 | |
9b224c5e PA |
1368 | /* Pass on any pending signal for this thread. */ |
1369 | sig = get_detach_signal (thread); | |
1370 | ||
ae13219e | 1371 | /* Finally, let it resume. */ |
82bfbe7e PA |
1372 | if (the_low_target.prepare_to_resume != NULL) |
1373 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1374 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1375 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1376 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1377 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1378 | strerror (errno)); |
bd99dc85 PA |
1379 | |
1380 | delete_lwp (lwp); | |
95954743 | 1381 | return 0; |
6ad8ae5c DJ |
1382 | } |
1383 | ||
95954743 PA |
1384 | static int |
1385 | linux_detach (int pid) | |
1386 | { | |
1387 | struct process_info *process; | |
1388 | ||
1389 | process = find_process_pid (pid); | |
1390 | if (process == NULL) | |
1391 | return -1; | |
1392 | ||
863d01bd PA |
1393 | /* As there's a step over already in progress, let it finish first, |
1394 | otherwise nesting a stabilize_threads operation on top gets real | |
1395 | messy. */ | |
1396 | complete_ongoing_step_over (); | |
1397 | ||
f9e39928 PA |
1398 | /* Stop all threads before detaching. First, ptrace requires that |
1399 | the thread is stopped to sucessfully detach. Second, thread_db | |
1400 | may need to uninstall thread event breakpoints from memory, which | |
1401 | only works with a stopped process anyway. */ | |
7984d532 | 1402 | stop_all_lwps (0, NULL); |
f9e39928 | 1403 | |
ca5c370d | 1404 | #ifdef USE_THREAD_DB |
8336d594 | 1405 | thread_db_detach (process); |
ca5c370d PA |
1406 | #endif |
1407 | ||
fa593d66 PA |
1408 | /* Stabilize threads (move out of jump pads). */ |
1409 | stabilize_threads (); | |
1410 | ||
95954743 | 1411 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1412 | |
1413 | the_target->mourn (process); | |
f9e39928 PA |
1414 | |
1415 | /* Since we presently can only stop all lwps of all processes, we | |
1416 | need to unstop lwps of other processes. */ | |
7984d532 | 1417 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1418 | return 0; |
1419 | } | |
1420 | ||
1421 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1422 | ||
1423 | static int | |
1424 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1425 | { | |
d86d4aaf DE |
1426 | struct thread_info *thread = (struct thread_info *) entry; |
1427 | struct lwp_info *lwp = get_thread_lwp (thread); | |
9a3c8263 | 1428 | struct process_info *process = (struct process_info *) proc; |
f9e39928 | 1429 | |
d86d4aaf | 1430 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1431 | delete_lwp (lwp); |
1432 | ||
dd6953e1 | 1433 | return 0; |
6ad8ae5c DJ |
1434 | } |
1435 | ||
8336d594 PA |
1436 | static void |
1437 | linux_mourn (struct process_info *process) | |
1438 | { | |
1439 | struct process_info_private *priv; | |
1440 | ||
1441 | #ifdef USE_THREAD_DB | |
1442 | thread_db_mourn (process); | |
1443 | #endif | |
1444 | ||
d86d4aaf | 1445 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1446 | |
8336d594 | 1447 | /* Freeing all private data. */ |
fe978cb0 | 1448 | priv = process->priv; |
8336d594 PA |
1449 | free (priv->arch_private); |
1450 | free (priv); | |
fe978cb0 | 1451 | process->priv = NULL; |
505106cd PA |
1452 | |
1453 | remove_process (process); | |
8336d594 PA |
1454 | } |
1455 | ||
444d6139 | 1456 | static void |
95954743 | 1457 | linux_join (int pid) |
444d6139 | 1458 | { |
444d6139 PA |
1459 | int status, ret; |
1460 | ||
1461 | do { | |
95954743 | 1462 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1463 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1464 | break; | |
1465 | } while (ret != -1 || errno != ECHILD); | |
1466 | } | |
1467 | ||
6ad8ae5c | 1468 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1469 | static int |
95954743 | 1470 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1471 | { |
95954743 PA |
1472 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1473 | ||
1474 | /* We assume we always know if a thread exits. If a whole process | |
1475 | exited but we still haven't been able to report it to GDB, we'll | |
1476 | hold on to the last lwp of the dead process. */ | |
1477 | if (lwp != NULL) | |
00db26fa | 1478 | return !lwp_is_marked_dead (lwp); |
0d62e5e8 DJ |
1479 | else |
1480 | return 0; | |
1481 | } | |
1482 | ||
582511be PA |
1483 | /* Return 1 if this lwp still has an interesting status pending. If |
1484 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1485 | false. */ | |
1486 | ||
1487 | static int | |
1488 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1489 | { | |
1490 | struct lwp_info *lp = get_thread_lwp (thread); | |
1491 | ||
1492 | if (!lp->status_pending_p) | |
1493 | return 0; | |
1494 | ||
1495 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1496 | report any status pending the LWP may have. */ | |
1497 | if (thread->last_resume_kind == resume_stop | |
1498 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
1499 | return 0; | |
1500 | ||
1501 | if (thread->last_resume_kind != resume_stop | |
15c66dd6 PA |
1502 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1503 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1504 | { |
1505 | struct thread_info *saved_thread; | |
1506 | CORE_ADDR pc; | |
1507 | int discard = 0; | |
1508 | ||
1509 | gdb_assert (lp->last_status != 0); | |
1510 | ||
1511 | pc = get_pc (lp); | |
1512 | ||
1513 | saved_thread = current_thread; | |
1514 | current_thread = thread; | |
1515 | ||
1516 | if (pc != lp->stop_pc) | |
1517 | { | |
1518 | if (debug_threads) | |
1519 | debug_printf ("PC of %ld changed\n", | |
1520 | lwpid_of (thread)); | |
1521 | discard = 1; | |
1522 | } | |
3e572f71 PA |
1523 | |
1524 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1525 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1526 | && !(*the_low_target.breakpoint_at) (pc)) |
1527 | { | |
1528 | if (debug_threads) | |
1529 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1530 | lwpid_of (thread)); | |
1531 | discard = 1; | |
1532 | } | |
15c66dd6 | 1533 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1534 | && !hardware_breakpoint_inserted_here (pc)) |
1535 | { | |
1536 | if (debug_threads) | |
1537 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1538 | lwpid_of (thread)); | |
1539 | discard = 1; | |
1540 | } | |
3e572f71 | 1541 | #endif |
582511be PA |
1542 | |
1543 | current_thread = saved_thread; | |
1544 | ||
1545 | if (discard) | |
1546 | { | |
1547 | if (debug_threads) | |
1548 | debug_printf ("discarding pending breakpoint status\n"); | |
1549 | lp->status_pending_p = 0; | |
1550 | return 0; | |
1551 | } | |
1552 | } | |
1553 | ||
1554 | return 1; | |
1555 | } | |
1556 | ||
6bf5e0ba | 1557 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1558 | static int |
d50171e4 | 1559 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1560 | { |
d86d4aaf | 1561 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1562 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1563 | ptid_t ptid = * (ptid_t *) arg; |
1564 | ||
1565 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1566 | or a specific LWP. */ |
1567 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1568 | return 0; |
0d62e5e8 | 1569 | |
582511be PA |
1570 | if (lp->status_pending_p |
1571 | && !thread_still_has_status_pending_p (thread)) | |
1572 | { | |
1573 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1574 | return 0; | |
1575 | } | |
0d62e5e8 | 1576 | |
582511be | 1577 | return lp->status_pending_p; |
0d62e5e8 DJ |
1578 | } |
1579 | ||
95954743 PA |
1580 | static int |
1581 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1582 | { | |
1583 | ptid_t ptid = *(ptid_t *) data; | |
1584 | int lwp; | |
1585 | ||
1586 | if (ptid_get_lwp (ptid) != 0) | |
1587 | lwp = ptid_get_lwp (ptid); | |
1588 | else | |
1589 | lwp = ptid_get_pid (ptid); | |
1590 | ||
1591 | if (ptid_get_lwp (entry->id) == lwp) | |
1592 | return 1; | |
1593 | ||
1594 | return 0; | |
1595 | } | |
1596 | ||
1597 | struct lwp_info * | |
1598 | find_lwp_pid (ptid_t ptid) | |
1599 | { | |
d86d4aaf DE |
1600 | struct inferior_list_entry *thread |
1601 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1602 | ||
1603 | if (thread == NULL) | |
1604 | return NULL; | |
1605 | ||
1606 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1607 | } |
1608 | ||
fa96cb38 | 1609 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1610 | |
fa96cb38 PA |
1611 | static int |
1612 | num_lwps (int pid) | |
1613 | { | |
1614 | struct inferior_list_entry *inf, *tmp; | |
1615 | int count = 0; | |
0d62e5e8 | 1616 | |
fa96cb38 | 1617 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1618 | { |
fa96cb38 PA |
1619 | if (ptid_get_pid (inf->id) == pid) |
1620 | count++; | |
24a09b5f | 1621 | } |
3aee8918 | 1622 | |
fa96cb38 PA |
1623 | return count; |
1624 | } | |
d61ddec4 | 1625 | |
6d4ee8c6 GB |
1626 | /* The arguments passed to iterate_over_lwps. */ |
1627 | ||
1628 | struct iterate_over_lwps_args | |
1629 | { | |
1630 | /* The FILTER argument passed to iterate_over_lwps. */ | |
1631 | ptid_t filter; | |
1632 | ||
1633 | /* The CALLBACK argument passed to iterate_over_lwps. */ | |
1634 | iterate_over_lwps_ftype *callback; | |
1635 | ||
1636 | /* The DATA argument passed to iterate_over_lwps. */ | |
1637 | void *data; | |
1638 | }; | |
1639 | ||
1640 | /* Callback for find_inferior used by iterate_over_lwps to filter | |
1641 | calls to the callback supplied to that function. Returning a | |
1642 | nonzero value causes find_inferiors to stop iterating and return | |
1643 | the current inferior_list_entry. Returning zero indicates that | |
1644 | find_inferiors should continue iterating. */ | |
1645 | ||
1646 | static int | |
1647 | iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p) | |
1648 | { | |
1649 | struct iterate_over_lwps_args *args | |
1650 | = (struct iterate_over_lwps_args *) args_p; | |
1651 | ||
1652 | if (ptid_match (entry->id, args->filter)) | |
1653 | { | |
1654 | struct thread_info *thr = (struct thread_info *) entry; | |
1655 | struct lwp_info *lwp = get_thread_lwp (thr); | |
1656 | ||
1657 | return (*args->callback) (lwp, args->data); | |
1658 | } | |
1659 | ||
1660 | return 0; | |
1661 | } | |
1662 | ||
1663 | /* See nat/linux-nat.h. */ | |
1664 | ||
1665 | struct lwp_info * | |
1666 | iterate_over_lwps (ptid_t filter, | |
1667 | iterate_over_lwps_ftype callback, | |
1668 | void *data) | |
1669 | { | |
1670 | struct iterate_over_lwps_args args = {filter, callback, data}; | |
1671 | struct inferior_list_entry *entry; | |
1672 | ||
1673 | entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args); | |
1674 | if (entry == NULL) | |
1675 | return NULL; | |
1676 | ||
1677 | return get_thread_lwp ((struct thread_info *) entry); | |
1678 | } | |
1679 | ||
fa96cb38 PA |
1680 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1681 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1682 | |
fa96cb38 PA |
1683 | static void |
1684 | check_zombie_leaders (void) | |
1685 | { | |
1686 | struct process_info *proc, *tmp; | |
c3adc08c | 1687 | |
fa96cb38 | 1688 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1689 | { |
fa96cb38 PA |
1690 | pid_t leader_pid = pid_of (proc); |
1691 | struct lwp_info *leader_lp; | |
c3adc08c | 1692 | |
fa96cb38 | 1693 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1694 | |
fa96cb38 PA |
1695 | if (debug_threads) |
1696 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1697 | "num_lwps=%d, zombie=%d\n", | |
1698 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1699 | linux_proc_pid_is_zombie (leader_pid)); | |
1700 | ||
94585166 | 1701 | if (leader_lp != NULL && !leader_lp->stopped |
fa96cb38 PA |
1702 | /* Check if there are other threads in the group, as we may |
1703 | have raced with the inferior simply exiting. */ | |
1704 | && !last_thread_of_process_p (leader_pid) | |
1705 | && linux_proc_pid_is_zombie (leader_pid)) | |
1706 | { | |
1707 | /* A leader zombie can mean one of two things: | |
1708 | ||
1709 | - It exited, and there's an exit status pending | |
1710 | available, or only the leader exited (not the whole | |
1711 | program). In the latter case, we can't waitpid the | |
1712 | leader's exit status until all other threads are gone. | |
1713 | ||
1714 | - There are 3 or more threads in the group, and a thread | |
1715 | other than the leader exec'd. On an exec, the Linux | |
1716 | kernel destroys all other threads (except the execing | |
1717 | one) in the thread group, and resets the execing thread's | |
1718 | tid to the tgid. No exit notification is sent for the | |
1719 | execing thread -- from the ptracer's perspective, it | |
1720 | appears as though the execing thread just vanishes. | |
1721 | Until we reap all other threads except the leader and the | |
1722 | execing thread, the leader will be zombie, and the | |
1723 | execing thread will be in `D (disc sleep)'. As soon as | |
1724 | all other threads are reaped, the execing thread changes | |
1725 | it's tid to the tgid, and the previous (zombie) leader | |
1726 | vanishes, giving place to the "new" leader. We could try | |
1727 | distinguishing the exit and exec cases, by waiting once | |
1728 | more, and seeing if something comes out, but it doesn't | |
1729 | sound useful. The previous leader _does_ go away, and | |
1730 | we'll re-add the new one once we see the exec event | |
1731 | (which is just the same as what would happen if the | |
1732 | previous leader did exit voluntarily before some other | |
1733 | thread execs). */ | |
c3adc08c | 1734 | |
fa96cb38 PA |
1735 | if (debug_threads) |
1736 | fprintf (stderr, | |
1737 | "CZL: Thread group leader %d zombie " | |
1738 | "(it exited, or another thread execd).\n", | |
1739 | leader_pid); | |
c3adc08c | 1740 | |
fa96cb38 | 1741 | delete_lwp (leader_lp); |
c3adc08c PA |
1742 | } |
1743 | } | |
fa96cb38 | 1744 | } |
c3adc08c | 1745 | |
fa96cb38 PA |
1746 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1747 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1748 | |
fa96cb38 PA |
1749 | static int |
1750 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1751 | { | |
1752 | struct thread_info *thr = (struct thread_info *) entry; | |
1753 | struct lwp_info *lwp; | |
1754 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1755 | |
fa96cb38 PA |
1756 | if (!ptid_match (ptid_of (thr), filter)) |
1757 | return 0; | |
bd99dc85 | 1758 | |
fa96cb38 PA |
1759 | lwp = get_thread_lwp (thr); |
1760 | if (!lwp->stopped) | |
1761 | return 1; | |
1762 | ||
1763 | return 0; | |
0d62e5e8 | 1764 | } |
611cb4a5 | 1765 | |
863d01bd PA |
1766 | /* Increment LWP's suspend count. */ |
1767 | ||
1768 | static void | |
1769 | lwp_suspended_inc (struct lwp_info *lwp) | |
1770 | { | |
1771 | lwp->suspended++; | |
1772 | ||
1773 | if (debug_threads && lwp->suspended > 4) | |
1774 | { | |
1775 | struct thread_info *thread = get_lwp_thread (lwp); | |
1776 | ||
1777 | debug_printf ("LWP %ld has a suspiciously high suspend count," | |
1778 | " suspended=%d\n", lwpid_of (thread), lwp->suspended); | |
1779 | } | |
1780 | } | |
1781 | ||
1782 | /* Decrement LWP's suspend count. */ | |
1783 | ||
1784 | static void | |
1785 | lwp_suspended_decr (struct lwp_info *lwp) | |
1786 | { | |
1787 | lwp->suspended--; | |
1788 | ||
1789 | if (lwp->suspended < 0) | |
1790 | { | |
1791 | struct thread_info *thread = get_lwp_thread (lwp); | |
1792 | ||
1793 | internal_error (__FILE__, __LINE__, | |
1794 | "unsuspend LWP %ld, suspended=%d\n", lwpid_of (thread), | |
1795 | lwp->suspended); | |
1796 | } | |
1797 | } | |
1798 | ||
219f2f23 PA |
1799 | /* This function should only be called if the LWP got a SIGTRAP. |
1800 | ||
1801 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1802 | event was handled, 0 otherwise. */ | |
1803 | ||
1804 | static int | |
1805 | handle_tracepoints (struct lwp_info *lwp) | |
1806 | { | |
1807 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1808 | int tpoint_related_event = 0; | |
1809 | ||
582511be PA |
1810 | gdb_assert (lwp->suspended == 0); |
1811 | ||
7984d532 PA |
1812 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1813 | uninsert tracepoints. To do this, we temporarily pause all | |
1814 | threads, unpatch away, and then unpause threads. We need to make | |
1815 | sure the unpausing doesn't resume LWP too. */ | |
863d01bd | 1816 | lwp_suspended_inc (lwp); |
7984d532 | 1817 | |
219f2f23 PA |
1818 | /* And we need to be sure that any all-threads-stopping doesn't try |
1819 | to move threads out of the jump pads, as it could deadlock the | |
1820 | inferior (LWP could be in the jump pad, maybe even holding the | |
1821 | lock.) */ | |
1822 | ||
1823 | /* Do any necessary step collect actions. */ | |
1824 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1825 | ||
fa593d66 PA |
1826 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1827 | ||
219f2f23 PA |
1828 | /* See if we just hit a tracepoint and do its main collect |
1829 | actions. */ | |
1830 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1831 | ||
863d01bd | 1832 | lwp_suspended_decr (lwp); |
7984d532 PA |
1833 | |
1834 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1835 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1836 | |
219f2f23 PA |
1837 | if (tpoint_related_event) |
1838 | { | |
1839 | if (debug_threads) | |
87ce2a04 | 1840 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1841 | return 1; |
1842 | } | |
1843 | ||
1844 | return 0; | |
1845 | } | |
1846 | ||
fa593d66 PA |
1847 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1848 | fast tracepoint. */ | |
1849 | ||
1850 | static int | |
1851 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1852 | struct fast_tpoint_collect_status *status) | |
1853 | { | |
1854 | CORE_ADDR thread_area; | |
d86d4aaf | 1855 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1856 | |
1857 | if (the_low_target.get_thread_area == NULL) | |
1858 | return 0; | |
1859 | ||
1860 | /* Get the thread area address. This is used to recognize which | |
1861 | thread is which when tracing with the in-process agent library. | |
1862 | We don't read anything from the address, and treat it as opaque; | |
1863 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1864 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1865 | return 0; |
1866 | ||
1867 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1868 | } | |
1869 | ||
1870 | /* The reason we resume in the caller, is because we want to be able | |
1871 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1872 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1873 | refuses to resume. */ | |
1874 | ||
1875 | static int | |
1876 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1877 | { | |
0bfdf32f | 1878 | struct thread_info *saved_thread; |
fa593d66 | 1879 | |
0bfdf32f GB |
1880 | saved_thread = current_thread; |
1881 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1882 | |
1883 | if ((wstat == NULL | |
1884 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1885 | && supports_fast_tracepoints () | |
58b4daa5 | 1886 | && agent_loaded_p ()) |
fa593d66 PA |
1887 | { |
1888 | struct fast_tpoint_collect_status status; | |
1889 | int r; | |
1890 | ||
1891 | if (debug_threads) | |
87ce2a04 DE |
1892 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1893 | "jump pad.\n", | |
0bfdf32f | 1894 | lwpid_of (current_thread)); |
fa593d66 PA |
1895 | |
1896 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1897 | ||
1898 | if (wstat == NULL | |
1899 | || (WSTOPSIG (*wstat) != SIGILL | |
1900 | && WSTOPSIG (*wstat) != SIGFPE | |
1901 | && WSTOPSIG (*wstat) != SIGSEGV | |
1902 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1903 | { | |
1904 | lwp->collecting_fast_tracepoint = r; | |
1905 | ||
1906 | if (r != 0) | |
1907 | { | |
1908 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1909 | { | |
1910 | /* Haven't executed the original instruction yet. | |
1911 | Set breakpoint there, and wait till it's hit, | |
1912 | then single-step until exiting the jump pad. */ | |
1913 | lwp->exit_jump_pad_bkpt | |
1914 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1915 | } | |
1916 | ||
1917 | if (debug_threads) | |
87ce2a04 DE |
1918 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1919 | "the jump pad...it does\n", | |
0bfdf32f GB |
1920 | lwpid_of (current_thread)); |
1921 | current_thread = saved_thread; | |
fa593d66 PA |
1922 | |
1923 | return 1; | |
1924 | } | |
1925 | } | |
1926 | else | |
1927 | { | |
1928 | /* If we get a synchronous signal while collecting, *and* | |
1929 | while executing the (relocated) original instruction, | |
1930 | reset the PC to point at the tpoint address, before | |
1931 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1932 | report the signal to GDB, and pray for the best. */ | |
1933 | ||
1934 | lwp->collecting_fast_tracepoint = 0; | |
1935 | ||
1936 | if (r != 0 | |
1937 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1938 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1939 | { | |
1940 | siginfo_t info; | |
1941 | struct regcache *regcache; | |
1942 | ||
1943 | /* The si_addr on a few signals references the address | |
1944 | of the faulting instruction. Adjust that as | |
1945 | well. */ | |
1946 | if ((WSTOPSIG (*wstat) == SIGILL | |
1947 | || WSTOPSIG (*wstat) == SIGFPE | |
1948 | || WSTOPSIG (*wstat) == SIGBUS | |
1949 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 1950 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1951 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1952 | /* Final check just to make sure we don't clobber |
1953 | the siginfo of non-kernel-sent signals. */ | |
1954 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1955 | { | |
1956 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 1957 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1958 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1959 | } |
1960 | ||
0bfdf32f | 1961 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
1962 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1963 | lwp->stop_pc = status.tpoint_addr; | |
1964 | ||
1965 | /* Cancel any fast tracepoint lock this thread was | |
1966 | holding. */ | |
1967 | force_unlock_trace_buffer (); | |
1968 | } | |
1969 | ||
1970 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1971 | { | |
1972 | if (debug_threads) | |
87ce2a04 DE |
1973 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1974 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1975 | |
1976 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
1977 | |
1978 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1979 | lwp->exit_jump_pad_bkpt = NULL; | |
1980 | ||
1981 | unstop_all_lwps (1, lwp); | |
1982 | ||
1983 | gdb_assert (lwp->suspended >= 0); | |
1984 | } | |
1985 | } | |
1986 | } | |
1987 | ||
1988 | if (debug_threads) | |
87ce2a04 DE |
1989 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1990 | "jump pad...no\n", | |
0bfdf32f | 1991 | lwpid_of (current_thread)); |
0cccb683 | 1992 | |
0bfdf32f | 1993 | current_thread = saved_thread; |
fa593d66 PA |
1994 | return 0; |
1995 | } | |
1996 | ||
1997 | /* Enqueue one signal in the "signals to report later when out of the | |
1998 | jump pad" list. */ | |
1999 | ||
2000 | static void | |
2001 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2002 | { | |
2003 | struct pending_signals *p_sig; | |
d86d4aaf | 2004 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
2005 | |
2006 | if (debug_threads) | |
87ce2a04 | 2007 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 2008 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2009 | |
2010 | if (debug_threads) | |
2011 | { | |
2012 | struct pending_signals *sig; | |
2013 | ||
2014 | for (sig = lwp->pending_signals_to_report; | |
2015 | sig != NULL; | |
2016 | sig = sig->prev) | |
87ce2a04 DE |
2017 | debug_printf (" Already queued %d\n", |
2018 | sig->signal); | |
fa593d66 | 2019 | |
87ce2a04 | 2020 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
2021 | } |
2022 | ||
1a981360 PA |
2023 | /* Don't enqueue non-RT signals if they are already in the deferred |
2024 | queue. (SIGSTOP being the easiest signal to see ending up here | |
2025 | twice) */ | |
2026 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
2027 | { | |
2028 | struct pending_signals *sig; | |
2029 | ||
2030 | for (sig = lwp->pending_signals_to_report; | |
2031 | sig != NULL; | |
2032 | sig = sig->prev) | |
2033 | { | |
2034 | if (sig->signal == WSTOPSIG (*wstat)) | |
2035 | { | |
2036 | if (debug_threads) | |
87ce2a04 DE |
2037 | debug_printf ("Not requeuing already queued non-RT signal %d" |
2038 | " for LWP %ld\n", | |
2039 | sig->signal, | |
d86d4aaf | 2040 | lwpid_of (thread)); |
1a981360 PA |
2041 | return; |
2042 | } | |
2043 | } | |
2044 | } | |
2045 | ||
8d749320 | 2046 | p_sig = XCNEW (struct pending_signals); |
fa593d66 PA |
2047 | p_sig->prev = lwp->pending_signals_to_report; |
2048 | p_sig->signal = WSTOPSIG (*wstat); | |
8d749320 | 2049 | |
d86d4aaf | 2050 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2051 | &p_sig->info); |
fa593d66 PA |
2052 | |
2053 | lwp->pending_signals_to_report = p_sig; | |
2054 | } | |
2055 | ||
2056 | /* Dequeue one signal from the "signals to report later when out of | |
2057 | the jump pad" list. */ | |
2058 | ||
2059 | static int | |
2060 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
2061 | { | |
d86d4aaf DE |
2062 | struct thread_info *thread = get_lwp_thread (lwp); |
2063 | ||
fa593d66 PA |
2064 | if (lwp->pending_signals_to_report != NULL) |
2065 | { | |
2066 | struct pending_signals **p_sig; | |
2067 | ||
2068 | p_sig = &lwp->pending_signals_to_report; | |
2069 | while ((*p_sig)->prev != NULL) | |
2070 | p_sig = &(*p_sig)->prev; | |
2071 | ||
2072 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
2073 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 2074 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 2075 | &(*p_sig)->info); |
fa593d66 PA |
2076 | free (*p_sig); |
2077 | *p_sig = NULL; | |
2078 | ||
2079 | if (debug_threads) | |
87ce2a04 | 2080 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 2081 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
2082 | |
2083 | if (debug_threads) | |
2084 | { | |
2085 | struct pending_signals *sig; | |
2086 | ||
2087 | for (sig = lwp->pending_signals_to_report; | |
2088 | sig != NULL; | |
2089 | sig = sig->prev) | |
87ce2a04 DE |
2090 | debug_printf (" Still queued %d\n", |
2091 | sig->signal); | |
fa593d66 | 2092 | |
87ce2a04 | 2093 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
2094 | } |
2095 | ||
2096 | return 1; | |
2097 | } | |
2098 | ||
2099 | return 0; | |
2100 | } | |
2101 | ||
582511be PA |
2102 | /* Fetch the possibly triggered data watchpoint info and store it in |
2103 | CHILD. | |
d50171e4 | 2104 | |
582511be PA |
2105 | On some archs, like x86, that use debug registers to set |
2106 | watchpoints, it's possible that the way to know which watched | |
2107 | address trapped, is to check the register that is used to select | |
2108 | which address to watch. Problem is, between setting the watchpoint | |
2109 | and reading back which data address trapped, the user may change | |
2110 | the set of watchpoints, and, as a consequence, GDB changes the | |
2111 | debug registers in the inferior. To avoid reading back a stale | |
2112 | stopped-data-address when that happens, we cache in LP the fact | |
2113 | that a watchpoint trapped, and the corresponding data address, as | |
2114 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
2115 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 2116 | |
582511be PA |
2117 | static int |
2118 | check_stopped_by_watchpoint (struct lwp_info *child) | |
2119 | { | |
2120 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 2121 | { |
582511be | 2122 | struct thread_info *saved_thread; |
d50171e4 | 2123 | |
582511be PA |
2124 | saved_thread = current_thread; |
2125 | current_thread = get_lwp_thread (child); | |
2126 | ||
2127 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 2128 | { |
15c66dd6 | 2129 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
2130 | |
2131 | if (the_low_target.stopped_data_address != NULL) | |
2132 | child->stopped_data_address | |
2133 | = the_low_target.stopped_data_address (); | |
2134 | else | |
2135 | child->stopped_data_address = 0; | |
d50171e4 PA |
2136 | } |
2137 | ||
0bfdf32f | 2138 | current_thread = saved_thread; |
d50171e4 PA |
2139 | } |
2140 | ||
15c66dd6 | 2141 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
2142 | } |
2143 | ||
de0d863e DB |
2144 | /* Return the ptrace options that we want to try to enable. */ |
2145 | ||
2146 | static int | |
2147 | linux_low_ptrace_options (int attached) | |
2148 | { | |
2149 | int options = 0; | |
2150 | ||
2151 | if (!attached) | |
2152 | options |= PTRACE_O_EXITKILL; | |
2153 | ||
2154 | if (report_fork_events) | |
2155 | options |= PTRACE_O_TRACEFORK; | |
2156 | ||
c269dbdb DB |
2157 | if (report_vfork_events) |
2158 | options |= (PTRACE_O_TRACEVFORK | PTRACE_O_TRACEVFORKDONE); | |
2159 | ||
94585166 DB |
2160 | if (report_exec_events) |
2161 | options |= PTRACE_O_TRACEEXEC; | |
2162 | ||
de0d863e DB |
2163 | return options; |
2164 | } | |
2165 | ||
fa96cb38 PA |
2166 | /* Do low-level handling of the event, and check if we should go on |
2167 | and pass it to caller code. Return the affected lwp if we are, or | |
2168 | NULL otherwise. */ | |
2169 | ||
2170 | static struct lwp_info * | |
582511be | 2171 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
2172 | { |
2173 | struct lwp_info *child; | |
2174 | struct thread_info *thread; | |
582511be | 2175 | int have_stop_pc = 0; |
fa96cb38 PA |
2176 | |
2177 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
2178 | ||
94585166 DB |
2179 | /* Check for stop events reported by a process we didn't already |
2180 | know about - anything not already in our LWP list. | |
2181 | ||
2182 | If we're expecting to receive stopped processes after | |
2183 | fork, vfork, and clone events, then we'll just add the | |
2184 | new one to our list and go back to waiting for the event | |
2185 | to be reported - the stopped process might be returned | |
2186 | from waitpid before or after the event is. | |
2187 | ||
2188 | But note the case of a non-leader thread exec'ing after the | |
2189 | leader having exited, and gone from our lists (because | |
2190 | check_zombie_leaders deleted it). The non-leader thread | |
2191 | changes its tid to the tgid. */ | |
2192 | ||
2193 | if (WIFSTOPPED (wstat) && child == NULL && WSTOPSIG (wstat) == SIGTRAP | |
2194 | && linux_ptrace_get_extended_event (wstat) == PTRACE_EVENT_EXEC) | |
2195 | { | |
2196 | ptid_t child_ptid; | |
2197 | ||
2198 | /* A multi-thread exec after we had seen the leader exiting. */ | |
2199 | if (debug_threads) | |
2200 | { | |
2201 | debug_printf ("LLW: Re-adding thread group leader LWP %d" | |
2202 | "after exec.\n", lwpid); | |
2203 | } | |
2204 | ||
2205 | child_ptid = ptid_build (lwpid, lwpid, 0); | |
2206 | child = add_lwp (child_ptid); | |
2207 | child->stopped = 1; | |
2208 | current_thread = child->thread; | |
2209 | } | |
2210 | ||
fa96cb38 PA |
2211 | /* If we didn't find a process, one of two things presumably happened: |
2212 | - A process we started and then detached from has exited. Ignore it. | |
2213 | - A process we are controlling has forked and the new child's stop | |
2214 | was reported to us by the kernel. Save its PID. */ | |
2215 | if (child == NULL && WIFSTOPPED (wstat)) | |
2216 | { | |
2217 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
2218 | return NULL; | |
2219 | } | |
2220 | else if (child == NULL) | |
2221 | return NULL; | |
2222 | ||
2223 | thread = get_lwp_thread (child); | |
2224 | ||
2225 | child->stopped = 1; | |
2226 | ||
2227 | child->last_status = wstat; | |
2228 | ||
582511be PA |
2229 | /* Check if the thread has exited. */ |
2230 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
2231 | { | |
2232 | if (debug_threads) | |
2233 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
2234 | if (num_lwps (pid_of (thread)) > 1) | |
2235 | { | |
2236 | ||
2237 | /* If there is at least one more LWP, then the exit signal was | |
2238 | not the end of the debugged application and should be | |
2239 | ignored. */ | |
2240 | delete_lwp (child); | |
2241 | return NULL; | |
2242 | } | |
2243 | else | |
2244 | { | |
2245 | /* This was the last lwp in the process. Since events are | |
2246 | serialized to GDB core, and we can't report this one | |
2247 | right now, but GDB core and the other target layers will | |
2248 | want to be notified about the exit code/signal, leave the | |
2249 | status pending for the next time we're able to report | |
2250 | it. */ | |
2251 | mark_lwp_dead (child, wstat); | |
2252 | return child; | |
2253 | } | |
2254 | } | |
2255 | ||
2256 | gdb_assert (WIFSTOPPED (wstat)); | |
2257 | ||
fa96cb38 PA |
2258 | if (WIFSTOPPED (wstat)) |
2259 | { | |
2260 | struct process_info *proc; | |
2261 | ||
c06cbd92 | 2262 | /* Architecture-specific setup after inferior is running. */ |
fa96cb38 | 2263 | proc = find_process_pid (pid_of (thread)); |
c06cbd92 | 2264 | if (proc->tdesc == NULL) |
fa96cb38 | 2265 | { |
c06cbd92 YQ |
2266 | if (proc->attached) |
2267 | { | |
c06cbd92 YQ |
2268 | /* This needs to happen after we have attached to the |
2269 | inferior and it is stopped for the first time, but | |
2270 | before we access any inferior registers. */ | |
94585166 | 2271 | linux_arch_setup_thread (thread); |
c06cbd92 YQ |
2272 | } |
2273 | else | |
2274 | { | |
2275 | /* The process is started, but GDBserver will do | |
2276 | architecture-specific setup after the program stops at | |
2277 | the first instruction. */ | |
2278 | child->status_pending_p = 1; | |
2279 | child->status_pending = wstat; | |
2280 | return child; | |
2281 | } | |
fa96cb38 PA |
2282 | } |
2283 | } | |
2284 | ||
fa96cb38 PA |
2285 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
2286 | { | |
beed38b8 | 2287 | struct process_info *proc = find_process_pid (pid_of (thread)); |
de0d863e | 2288 | int options = linux_low_ptrace_options (proc->attached); |
beed38b8 | 2289 | |
de0d863e | 2290 | linux_enable_event_reporting (lwpid, options); |
fa96cb38 PA |
2291 | child->must_set_ptrace_flags = 0; |
2292 | } | |
2293 | ||
582511be PA |
2294 | /* Be careful to not overwrite stop_pc until |
2295 | check_stopped_by_breakpoint is called. */ | |
fa96cb38 | 2296 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 2297 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 2298 | { |
582511be | 2299 | child->stop_pc = get_pc (child); |
94585166 | 2300 | if (handle_extended_wait (&child, wstat)) |
de0d863e DB |
2301 | { |
2302 | /* The event has been handled, so just return without | |
2303 | reporting it. */ | |
2304 | return NULL; | |
2305 | } | |
fa96cb38 PA |
2306 | } |
2307 | ||
3e572f71 PA |
2308 | /* Check first whether this was a SW/HW breakpoint before checking |
2309 | watchpoints, because at least s390 can't tell the data address of | |
2310 | hardware watchpoint hits, and returns stopped-by-watchpoint as | |
2311 | long as there's a watchpoint set. */ | |
2312 | if (WIFSTOPPED (wstat) && linux_wstatus_maybe_breakpoint (wstat)) | |
582511be PA |
2313 | { |
2314 | if (check_stopped_by_breakpoint (child)) | |
2315 | have_stop_pc = 1; | |
2316 | } | |
2317 | ||
3e572f71 PA |
2318 | /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint |
2319 | or hardware watchpoint. Check which is which if we got | |
863d01bd PA |
2320 | TARGET_STOPPED_BY_HW_BREAKPOINT. Likewise, we may have single |
2321 | stepped an instruction that triggered a watchpoint. In that | |
2322 | case, on some architectures (such as x86), instead of | |
2323 | TRAP_HWBKPT, si_code indicates TRAP_TRACE, and we need to check | |
2324 | the debug registers separately. */ | |
3e572f71 | 2325 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
863d01bd | 2326 | && child->stop_reason != TARGET_STOPPED_BY_SW_BREAKPOINT) |
3e572f71 PA |
2327 | check_stopped_by_watchpoint (child); |
2328 | ||
582511be PA |
2329 | if (!have_stop_pc) |
2330 | child->stop_pc = get_pc (child); | |
2331 | ||
fa96cb38 PA |
2332 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
2333 | && child->stop_expected) | |
2334 | { | |
2335 | if (debug_threads) | |
2336 | debug_printf ("Expected stop.\n"); | |
2337 | child->stop_expected = 0; | |
2338 | ||
2339 | if (thread->last_resume_kind == resume_stop) | |
2340 | { | |
2341 | /* We want to report the stop to the core. Treat the | |
2342 | SIGSTOP as a normal event. */ | |
2bf6fb9d PA |
2343 | if (debug_threads) |
2344 | debug_printf ("LLW: resume_stop SIGSTOP caught for %s.\n", | |
2345 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2346 | } |
2347 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
2348 | { | |
2349 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 2350 | pending. */ |
2bf6fb9d PA |
2351 | if (debug_threads) |
2352 | debug_printf ("LLW: SIGSTOP caught for %s " | |
2353 | "while stopping threads.\n", | |
2354 | target_pid_to_str (ptid_of (thread))); | |
fa96cb38 PA |
2355 | return NULL; |
2356 | } | |
2357 | else | |
2358 | { | |
2bf6fb9d PA |
2359 | /* This is a delayed SIGSTOP. Filter out the event. */ |
2360 | if (debug_threads) | |
2361 | debug_printf ("LLW: %s %s, 0, 0 (discard delayed SIGSTOP)\n", | |
2362 | child->stepping ? "step" : "continue", | |
2363 | target_pid_to_str (ptid_of (thread))); | |
2364 | ||
fa96cb38 PA |
2365 | linux_resume_one_lwp (child, child->stepping, 0, NULL); |
2366 | return NULL; | |
2367 | } | |
2368 | } | |
2369 | ||
582511be PA |
2370 | child->status_pending_p = 1; |
2371 | child->status_pending = wstat; | |
fa96cb38 PA |
2372 | return child; |
2373 | } | |
2374 | ||
20ba1ce6 PA |
2375 | /* Resume LWPs that are currently stopped without any pending status |
2376 | to report, but are resumed from the core's perspective. */ | |
2377 | ||
2378 | static void | |
2379 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
2380 | { | |
2381 | struct thread_info *thread = (struct thread_info *) entry; | |
2382 | struct lwp_info *lp = get_thread_lwp (thread); | |
2383 | ||
2384 | if (lp->stopped | |
863d01bd | 2385 | && !lp->suspended |
20ba1ce6 PA |
2386 | && !lp->status_pending_p |
2387 | && thread->last_resume_kind != resume_stop | |
2388 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
2389 | { | |
2390 | int step = thread->last_resume_kind == resume_step; | |
2391 | ||
2392 | if (debug_threads) | |
2393 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2394 | target_pid_to_str (ptid_of (thread)), | |
2395 | paddress (lp->stop_pc), | |
2396 | step); | |
2397 | ||
2398 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2399 | } | |
2400 | } | |
2401 | ||
fa96cb38 PA |
2402 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2403 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2404 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2405 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2406 | the stop status through the status pointer WSTAT. OPTIONS is | |
2407 | passed to the waitpid call. Return 0 if no event was found and | |
2408 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2409 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2410 | |
0d62e5e8 | 2411 | static int |
fa96cb38 PA |
2412 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2413 | int *wstatp, int options) | |
0d62e5e8 | 2414 | { |
d86d4aaf | 2415 | struct thread_info *event_thread; |
d50171e4 | 2416 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2417 | sigset_t block_mask, prev_mask; |
d50171e4 | 2418 | |
fa96cb38 | 2419 | retry: |
d86d4aaf DE |
2420 | /* N.B. event_thread points to the thread_info struct that contains |
2421 | event_child. Keep them in sync. */ | |
2422 | event_thread = NULL; | |
d50171e4 PA |
2423 | event_child = NULL; |
2424 | requested_child = NULL; | |
0d62e5e8 | 2425 | |
95954743 | 2426 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2427 | |
fa96cb38 | 2428 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2429 | { |
d86d4aaf | 2430 | event_thread = (struct thread_info *) |
fa96cb38 | 2431 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
2432 | if (event_thread != NULL) |
2433 | event_child = get_thread_lwp (event_thread); | |
2434 | if (debug_threads && event_thread) | |
2435 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2436 | } |
fa96cb38 | 2437 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2438 | { |
fa96cb38 | 2439 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2440 | |
bde24c0a | 2441 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2442 | && requested_child->status_pending_p |
2443 | && requested_child->collecting_fast_tracepoint) | |
2444 | { | |
2445 | enqueue_one_deferred_signal (requested_child, | |
2446 | &requested_child->status_pending); | |
2447 | requested_child->status_pending_p = 0; | |
2448 | requested_child->status_pending = 0; | |
2449 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2450 | } | |
2451 | ||
2452 | if (requested_child->suspended | |
2453 | && requested_child->status_pending_p) | |
38e08fca GB |
2454 | { |
2455 | internal_error (__FILE__, __LINE__, | |
2456 | "requesting an event out of a" | |
2457 | " suspended child?"); | |
2458 | } | |
fa593d66 | 2459 | |
d50171e4 | 2460 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2461 | { |
2462 | event_child = requested_child; | |
2463 | event_thread = get_lwp_thread (event_child); | |
2464 | } | |
0d62e5e8 | 2465 | } |
611cb4a5 | 2466 | |
0d62e5e8 DJ |
2467 | if (event_child != NULL) |
2468 | { | |
bd99dc85 | 2469 | if (debug_threads) |
87ce2a04 | 2470 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2471 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2472 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2473 | event_child->status_pending_p = 0; |
2474 | event_child->status_pending = 0; | |
0bfdf32f | 2475 | current_thread = event_thread; |
d86d4aaf | 2476 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2477 | } |
2478 | ||
fa96cb38 PA |
2479 | /* But if we don't find a pending event, we'll have to wait. |
2480 | ||
2481 | We only enter this loop if no process has a pending wait status. | |
2482 | Thus any action taken in response to a wait status inside this | |
2483 | loop is responding as soon as we detect the status, not after any | |
2484 | pending events. */ | |
d8301ad1 | 2485 | |
fa96cb38 PA |
2486 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2487 | all signals while here. */ | |
2488 | sigfillset (&block_mask); | |
2489 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2490 | ||
582511be PA |
2491 | /* Always pull all events out of the kernel. We'll randomly select |
2492 | an event LWP out of all that have events, to prevent | |
2493 | starvation. */ | |
fa96cb38 | 2494 | while (event_child == NULL) |
0d62e5e8 | 2495 | { |
fa96cb38 | 2496 | pid_t ret = 0; |
0d62e5e8 | 2497 | |
fa96cb38 PA |
2498 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2499 | quirks: | |
0d62e5e8 | 2500 | |
fa96cb38 PA |
2501 | - If the thread group leader exits while other threads in the |
2502 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2503 | waitpid won't return an exit status until the other threads | |
2504 | in the group are reaped. | |
611cb4a5 | 2505 | |
fa96cb38 PA |
2506 | - When a non-leader thread execs, that thread just vanishes |
2507 | without reporting an exit (so we'd hang if we waited for it | |
2508 | explicitly in that case). The exec event is reported to | |
94585166 | 2509 | the TGID pid. */ |
fa96cb38 PA |
2510 | errno = 0; |
2511 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2512 | |
fa96cb38 PA |
2513 | if (debug_threads) |
2514 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2515 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2516 | |
fa96cb38 | 2517 | if (ret > 0) |
0d62e5e8 | 2518 | { |
89be2091 | 2519 | if (debug_threads) |
bd99dc85 | 2520 | { |
fa96cb38 PA |
2521 | debug_printf ("LLW: waitpid %ld received %s\n", |
2522 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2523 | } |
89be2091 | 2524 | |
582511be PA |
2525 | /* Filter all events. IOW, leave all events pending. We'll |
2526 | randomly select an event LWP out of all that have events | |
2527 | below. */ | |
2528 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2529 | /* Retry until nothing comes out of waitpid. A single |
2530 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2531 | continue; |
2532 | } | |
2533 | ||
20ba1ce6 PA |
2534 | /* Now that we've pulled all events out of the kernel, resume |
2535 | LWPs that don't have an interesting event to report. */ | |
2536 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2537 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2538 | ||
2539 | /* ... and find an LWP with a status to report to the core, if | |
2540 | any. */ | |
582511be PA |
2541 | event_thread = (struct thread_info *) |
2542 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2543 | if (event_thread != NULL) | |
2544 | { | |
2545 | event_child = get_thread_lwp (event_thread); | |
2546 | *wstatp = event_child->status_pending; | |
2547 | event_child->status_pending_p = 0; | |
2548 | event_child->status_pending = 0; | |
2549 | break; | |
2550 | } | |
2551 | ||
fa96cb38 PA |
2552 | /* Check for zombie thread group leaders. Those can't be reaped |
2553 | until all other threads in the thread group are. */ | |
2554 | check_zombie_leaders (); | |
2555 | ||
2556 | /* If there are no resumed children left in the set of LWPs we | |
2557 | want to wait for, bail. We can't just block in | |
2558 | waitpid/sigsuspend, because lwps might have been left stopped | |
2559 | in trace-stop state, and we'd be stuck forever waiting for | |
2560 | their status to change (which would only happen if we resumed | |
2561 | them). Even if WNOHANG is set, this return code is preferred | |
2562 | over 0 (below), as it is more detailed. */ | |
2563 | if ((find_inferior (&all_threads, | |
2564 | not_stopped_callback, | |
2565 | &wait_ptid) == NULL)) | |
a6dbe5df | 2566 | { |
fa96cb38 PA |
2567 | if (debug_threads) |
2568 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2569 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2570 | return -1; | |
a6dbe5df PA |
2571 | } |
2572 | ||
fa96cb38 PA |
2573 | /* No interesting event to report to the caller. */ |
2574 | if ((options & WNOHANG)) | |
24a09b5f | 2575 | { |
fa96cb38 PA |
2576 | if (debug_threads) |
2577 | debug_printf ("WNOHANG set, no event found\n"); | |
2578 | ||
2579 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2580 | return 0; | |
24a09b5f DJ |
2581 | } |
2582 | ||
fa96cb38 PA |
2583 | /* Block until we get an event reported with SIGCHLD. */ |
2584 | if (debug_threads) | |
2585 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2586 | |
fa96cb38 PA |
2587 | sigsuspend (&prev_mask); |
2588 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2589 | goto retry; | |
2590 | } | |
d50171e4 | 2591 | |
fa96cb38 | 2592 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2593 | |
0bfdf32f | 2594 | current_thread = event_thread; |
d50171e4 | 2595 | |
fa96cb38 PA |
2596 | /* Check for thread exit. */ |
2597 | if (! WIFSTOPPED (*wstatp)) | |
2598 | { | |
2599 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2600 | ||
2601 | if (debug_threads) | |
2602 | debug_printf ("LWP %d is the last lwp of process. " | |
2603 | "Process %ld exiting.\n", | |
2604 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2605 | return lwpid_of (event_thread); |
611cb4a5 | 2606 | } |
0d62e5e8 | 2607 | |
fa96cb38 PA |
2608 | return lwpid_of (event_thread); |
2609 | } | |
2610 | ||
2611 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2612 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2613 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2614 | the stop status through the status pointer WSTAT. OPTIONS is | |
2615 | passed to the waitpid call. Return 0 if no event was found and | |
2616 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2617 | was found. Return the PID of the stopped child otherwise. */ | |
2618 | ||
2619 | static int | |
2620 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2621 | { | |
2622 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2623 | } |
2624 | ||
6bf5e0ba PA |
2625 | /* Count the LWP's that have had events. */ |
2626 | ||
2627 | static int | |
2628 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2629 | { | |
d86d4aaf | 2630 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2631 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2632 | int *count = (int *) data; |
6bf5e0ba PA |
2633 | |
2634 | gdb_assert (count != NULL); | |
2635 | ||
582511be | 2636 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2637 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2638 | && lp->status_pending_p) |
6bf5e0ba PA |
2639 | (*count)++; |
2640 | ||
2641 | return 0; | |
2642 | } | |
2643 | ||
2644 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2645 | ||
2646 | static int | |
2647 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2648 | { | |
d86d4aaf DE |
2649 | struct thread_info *thread = (struct thread_info *) entry; |
2650 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2651 | |
8336d594 PA |
2652 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2653 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2654 | && lp->status_pending_p) |
2655 | return 1; | |
2656 | else | |
2657 | return 0; | |
2658 | } | |
2659 | ||
b90fc188 | 2660 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2661 | |
2662 | static int | |
2663 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2664 | { | |
d86d4aaf | 2665 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2666 | struct lwp_info *lp = get_thread_lwp (thread); |
9a3c8263 | 2667 | int *selector = (int *) data; |
6bf5e0ba PA |
2668 | |
2669 | gdb_assert (selector != NULL); | |
2670 | ||
582511be | 2671 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2672 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2673 | && lp->status_pending_p) |
6bf5e0ba PA |
2674 | if ((*selector)-- == 0) |
2675 | return 1; | |
2676 | ||
2677 | return 0; | |
2678 | } | |
2679 | ||
6bf5e0ba PA |
2680 | /* Select one LWP out of those that have events pending. */ |
2681 | ||
2682 | static void | |
2683 | select_event_lwp (struct lwp_info **orig_lp) | |
2684 | { | |
2685 | int num_events = 0; | |
2686 | int random_selector; | |
582511be PA |
2687 | struct thread_info *event_thread = NULL; |
2688 | ||
2689 | /* In all-stop, give preference to the LWP that is being | |
2690 | single-stepped. There will be at most one, and it's the LWP that | |
2691 | the core is most interested in. If we didn't do this, then we'd | |
2692 | have to handle pending step SIGTRAPs somehow in case the core | |
2693 | later continues the previously-stepped thread, otherwise we'd | |
2694 | report the pending SIGTRAP, and the core, not having stepped the | |
2695 | thread, wouldn't understand what the trap was for, and therefore | |
2696 | would report it to the user as a random signal. */ | |
2697 | if (!non_stop) | |
6bf5e0ba | 2698 | { |
582511be PA |
2699 | event_thread |
2700 | = (struct thread_info *) find_inferior (&all_threads, | |
2701 | select_singlestep_lwp_callback, | |
2702 | NULL); | |
2703 | if (event_thread != NULL) | |
2704 | { | |
2705 | if (debug_threads) | |
2706 | debug_printf ("SEL: Select single-step %s\n", | |
2707 | target_pid_to_str (ptid_of (event_thread))); | |
2708 | } | |
6bf5e0ba | 2709 | } |
582511be | 2710 | if (event_thread == NULL) |
6bf5e0ba PA |
2711 | { |
2712 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2713 | which have had events. */ |
6bf5e0ba | 2714 | |
b90fc188 | 2715 | /* First see how many events we have. */ |
d86d4aaf | 2716 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2717 | gdb_assert (num_events > 0); |
6bf5e0ba | 2718 | |
b90fc188 PA |
2719 | /* Now randomly pick a LWP out of those that have had |
2720 | events. */ | |
6bf5e0ba PA |
2721 | random_selector = (int) |
2722 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2723 | ||
2724 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2725 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2726 | num_events, random_selector); | |
6bf5e0ba | 2727 | |
d86d4aaf DE |
2728 | event_thread |
2729 | = (struct thread_info *) find_inferior (&all_threads, | |
2730 | select_event_lwp_callback, | |
2731 | &random_selector); | |
6bf5e0ba PA |
2732 | } |
2733 | ||
d86d4aaf | 2734 | if (event_thread != NULL) |
6bf5e0ba | 2735 | { |
d86d4aaf DE |
2736 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2737 | ||
6bf5e0ba PA |
2738 | /* Switch the event LWP. */ |
2739 | *orig_lp = event_lp; | |
2740 | } | |
2741 | } | |
2742 | ||
7984d532 PA |
2743 | /* Decrement the suspend count of an LWP. */ |
2744 | ||
2745 | static int | |
2746 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2747 | { | |
d86d4aaf DE |
2748 | struct thread_info *thread = (struct thread_info *) entry; |
2749 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2750 | |
2751 | /* Ignore EXCEPT. */ | |
2752 | if (lwp == except) | |
2753 | return 0; | |
2754 | ||
863d01bd | 2755 | lwp_suspended_decr (lwp); |
7984d532 PA |
2756 | return 0; |
2757 | } | |
2758 | ||
2759 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2760 | NULL. */ | |
2761 | ||
2762 | static void | |
2763 | unsuspend_all_lwps (struct lwp_info *except) | |
2764 | { | |
d86d4aaf | 2765 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2766 | } |
2767 | ||
fa593d66 PA |
2768 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2769 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2770 | void *data); | |
2771 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2772 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2773 | struct target_waitstatus *ourstatus, | |
2774 | int target_options); | |
2775 | ||
2776 | /* Stabilize threads (move out of jump pads). | |
2777 | ||
2778 | If a thread is midway collecting a fast tracepoint, we need to | |
2779 | finish the collection and move it out of the jump pad before | |
2780 | reporting the signal. | |
2781 | ||
2782 | This avoids recursion while collecting (when a signal arrives | |
2783 | midway, and the signal handler itself collects), which would trash | |
2784 | the trace buffer. In case the user set a breakpoint in a signal | |
2785 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2786 | Most importantly, there are certain things we can't do safely if | |
2787 | threads are stopped in a jump pad (or in its callee's). For | |
2788 | example: | |
2789 | ||
2790 | - starting a new trace run. A thread still collecting the | |
2791 | previous run, could trash the trace buffer when resumed. The trace | |
2792 | buffer control structures would have been reset but the thread had | |
2793 | no way to tell. The thread could even midway memcpy'ing to the | |
2794 | buffer, which would mean that when resumed, it would clobber the | |
2795 | trace buffer that had been set for a new run. | |
2796 | ||
2797 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2798 | safely. Say you do tstart while a thread is stopped midway while | |
2799 | collecting. When the thread is later resumed, it finishes the | |
2800 | collection, and returns to the jump pad, to execute the original | |
2801 | instruction that was under the tracepoint jump at the time the | |
2802 | older run had been started. If the jump pad had been rewritten | |
2803 | since for something else in the new run, the thread would now | |
2804 | execute the wrong / random instructions. */ | |
2805 | ||
2806 | static void | |
2807 | linux_stabilize_threads (void) | |
2808 | { | |
0bfdf32f | 2809 | struct thread_info *saved_thread; |
d86d4aaf | 2810 | struct thread_info *thread_stuck; |
fa593d66 | 2811 | |
d86d4aaf DE |
2812 | thread_stuck |
2813 | = (struct thread_info *) find_inferior (&all_threads, | |
2814 | stuck_in_jump_pad_callback, | |
2815 | NULL); | |
2816 | if (thread_stuck != NULL) | |
fa593d66 | 2817 | { |
b4d51a55 | 2818 | if (debug_threads) |
87ce2a04 | 2819 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2820 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2821 | return; |
2822 | } | |
2823 | ||
0bfdf32f | 2824 | saved_thread = current_thread; |
fa593d66 PA |
2825 | |
2826 | stabilizing_threads = 1; | |
2827 | ||
2828 | /* Kick 'em all. */ | |
d86d4aaf | 2829 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2830 | |
2831 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2832 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2833 | { |
2834 | struct target_waitstatus ourstatus; | |
2835 | struct lwp_info *lwp; | |
fa593d66 PA |
2836 | int wstat; |
2837 | ||
2838 | /* Note that we go through the full wait even loop. While | |
2839 | moving threads out of jump pad, we need to be able to step | |
2840 | over internal breakpoints and such. */ | |
32fcada3 | 2841 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2842 | |
2843 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2844 | { | |
0bfdf32f | 2845 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2846 | |
2847 | /* Lock it. */ | |
863d01bd | 2848 | lwp_suspended_inc (lwp); |
fa593d66 | 2849 | |
a493e3e2 | 2850 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2851 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2852 | { |
2ea28649 | 2853 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2854 | enqueue_one_deferred_signal (lwp, &wstat); |
2855 | } | |
2856 | } | |
2857 | } | |
2858 | ||
d86d4aaf | 2859 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2860 | |
2861 | stabilizing_threads = 0; | |
2862 | ||
0bfdf32f | 2863 | current_thread = saved_thread; |
fa593d66 | 2864 | |
b4d51a55 | 2865 | if (debug_threads) |
fa593d66 | 2866 | { |
d86d4aaf DE |
2867 | thread_stuck |
2868 | = (struct thread_info *) find_inferior (&all_threads, | |
2869 | stuck_in_jump_pad_callback, | |
2870 | NULL); | |
2871 | if (thread_stuck != NULL) | |
87ce2a04 | 2872 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2873 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2874 | } |
2875 | } | |
2876 | ||
582511be PA |
2877 | static void async_file_mark (void); |
2878 | ||
2879 | /* Convenience function that is called when the kernel reports an | |
2880 | event that is not passed out to GDB. */ | |
2881 | ||
2882 | static ptid_t | |
2883 | ignore_event (struct target_waitstatus *ourstatus) | |
2884 | { | |
2885 | /* If we got an event, there may still be others, as a single | |
2886 | SIGCHLD can indicate more than one child stopped. This forces | |
2887 | another target_wait call. */ | |
2888 | async_file_mark (); | |
2889 | ||
2890 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2891 | return null_ptid; | |
2892 | } | |
2893 | ||
0d62e5e8 | 2894 | /* Wait for process, returns status. */ |
da6d8c04 | 2895 | |
95954743 PA |
2896 | static ptid_t |
2897 | linux_wait_1 (ptid_t ptid, | |
2898 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2899 | { |
e5f1222d | 2900 | int w; |
fc7238bb | 2901 | struct lwp_info *event_child; |
bd99dc85 | 2902 | int options; |
bd99dc85 | 2903 | int pid; |
6bf5e0ba PA |
2904 | int step_over_finished; |
2905 | int bp_explains_trap; | |
2906 | int maybe_internal_trap; | |
2907 | int report_to_gdb; | |
219f2f23 | 2908 | int trace_event; |
c2d6af84 | 2909 | int in_step_range; |
bd99dc85 | 2910 | |
87ce2a04 DE |
2911 | if (debug_threads) |
2912 | { | |
2913 | debug_enter (); | |
2914 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2915 | } | |
2916 | ||
bd99dc85 PA |
2917 | /* Translate generic target options into linux options. */ |
2918 | options = __WALL; | |
2919 | if (target_options & TARGET_WNOHANG) | |
2920 | options |= WNOHANG; | |
0d62e5e8 | 2921 | |
fa593d66 PA |
2922 | bp_explains_trap = 0; |
2923 | trace_event = 0; | |
c2d6af84 | 2924 | in_step_range = 0; |
bd99dc85 PA |
2925 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2926 | ||
6bf5e0ba PA |
2927 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2928 | pid = linux_wait_for_event (ptid, &w, options); | |
2929 | else | |
2930 | { | |
2931 | if (debug_threads) | |
87ce2a04 DE |
2932 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2933 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2934 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2935 | } | |
2936 | ||
fa96cb38 | 2937 | if (pid == 0) |
87ce2a04 | 2938 | { |
fa96cb38 PA |
2939 | gdb_assert (target_options & TARGET_WNOHANG); |
2940 | ||
87ce2a04 DE |
2941 | if (debug_threads) |
2942 | { | |
fa96cb38 PA |
2943 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2944 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2945 | debug_exit (); |
2946 | } | |
fa96cb38 PA |
2947 | |
2948 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2949 | return null_ptid; |
2950 | } | |
fa96cb38 PA |
2951 | else if (pid == -1) |
2952 | { | |
2953 | if (debug_threads) | |
2954 | { | |
2955 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2956 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2957 | debug_exit (); | |
2958 | } | |
bd99dc85 | 2959 | |
fa96cb38 PA |
2960 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2961 | return null_ptid; | |
2962 | } | |
0d62e5e8 | 2963 | |
0bfdf32f | 2964 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 2965 | |
fa96cb38 PA |
2966 | /* linux_wait_for_event only returns an exit status for the last |
2967 | child of a process. Report it. */ | |
2968 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2969 | { |
fa96cb38 | 2970 | if (WIFEXITED (w)) |
0d62e5e8 | 2971 | { |
fa96cb38 PA |
2972 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2973 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2974 | |
fa96cb38 | 2975 | if (debug_threads) |
bd99dc85 | 2976 | { |
fa96cb38 PA |
2977 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2978 | "retcode %d\n", | |
0bfdf32f | 2979 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2980 | WEXITSTATUS (w)); |
2981 | debug_exit (); | |
bd99dc85 | 2982 | } |
fa96cb38 PA |
2983 | } |
2984 | else | |
2985 | { | |
2986 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2987 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2988 | |
fa96cb38 PA |
2989 | if (debug_threads) |
2990 | { | |
2991 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2992 | "signal %d\n", | |
0bfdf32f | 2993 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2994 | WTERMSIG (w)); |
2995 | debug_exit (); | |
2996 | } | |
0d62e5e8 | 2997 | } |
fa96cb38 | 2998 | |
0bfdf32f | 2999 | return ptid_of (current_thread); |
da6d8c04 DJ |
3000 | } |
3001 | ||
8090aef2 PA |
3002 | /* If step-over executes a breakpoint instruction, it means a |
3003 | gdb/gdbserver breakpoint had been planted on top of a permanent | |
3004 | breakpoint. The PC has been adjusted by | |
3005 | check_stopped_by_breakpoint to point at the breakpoint address. | |
3006 | Advance the PC manually past the breakpoint, otherwise the | |
3007 | program would keep trapping the permanent breakpoint forever. */ | |
3008 | if (!ptid_equal (step_over_bkpt, null_ptid) | |
15c66dd6 | 3009 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) |
8090aef2 | 3010 | { |
dd373349 AT |
3011 | int increment_pc = 0; |
3012 | int breakpoint_kind = 0; | |
3013 | CORE_ADDR stop_pc = event_child->stop_pc; | |
3014 | ||
3015 | breakpoint_kind = the_target->breakpoint_kind_from_pc (&stop_pc); | |
3016 | the_target->sw_breakpoint_from_kind (breakpoint_kind, &increment_pc); | |
8090aef2 PA |
3017 | |
3018 | if (debug_threads) | |
3019 | { | |
3020 | debug_printf ("step-over for %s executed software breakpoint\n", | |
3021 | target_pid_to_str (ptid_of (current_thread))); | |
3022 | } | |
3023 | ||
3024 | if (increment_pc != 0) | |
3025 | { | |
3026 | struct regcache *regcache | |
3027 | = get_thread_regcache (current_thread, 1); | |
3028 | ||
3029 | event_child->stop_pc += increment_pc; | |
3030 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
3031 | ||
3032 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 3033 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
3034 | } |
3035 | } | |
3036 | ||
6bf5e0ba PA |
3037 | /* If this event was not handled before, and is not a SIGTRAP, we |
3038 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
3039 | a breakpoint is inserted at the current PC. If this target does | |
3040 | not support internal breakpoints at all, we also report the | |
3041 | SIGTRAP without further processing; it's of no concern to us. */ | |
3042 | maybe_internal_trap | |
3043 | = (supports_breakpoints () | |
3044 | && (WSTOPSIG (w) == SIGTRAP | |
3045 | || ((WSTOPSIG (w) == SIGILL | |
3046 | || WSTOPSIG (w) == SIGSEGV) | |
3047 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
3048 | ||
3049 | if (maybe_internal_trap) | |
3050 | { | |
3051 | /* Handle anything that requires bookkeeping before deciding to | |
3052 | report the event or continue waiting. */ | |
3053 | ||
3054 | /* First check if we can explain the SIGTRAP with an internal | |
3055 | breakpoint, or if we should possibly report the event to GDB. | |
3056 | Do this before anything that may remove or insert a | |
3057 | breakpoint. */ | |
3058 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
3059 | ||
3060 | /* We have a SIGTRAP, possibly a step-over dance has just | |
3061 | finished. If so, tweak the state machine accordingly, | |
3062 | reinsert breakpoints and delete any reinsert (software | |
3063 | single-step) breakpoints. */ | |
3064 | step_over_finished = finish_step_over (event_child); | |
3065 | ||
3066 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
3067 | check_breakpoints (event_child->stop_pc); | |
3068 | ||
219f2f23 PA |
3069 | /* Handle tracepoint data collecting. This may overflow the |
3070 | trace buffer, and cause a tracing stop, removing | |
3071 | breakpoints. */ | |
3072 | trace_event = handle_tracepoints (event_child); | |
3073 | ||
6bf5e0ba PA |
3074 | if (bp_explains_trap) |
3075 | { | |
3076 | /* If we stepped or ran into an internal breakpoint, we've | |
3077 | already handled it. So next time we resume (from this | |
3078 | PC), we should step over it. */ | |
3079 | if (debug_threads) | |
87ce2a04 | 3080 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3081 | |
8b07ae33 PA |
3082 | if (breakpoint_here (event_child->stop_pc)) |
3083 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
3084 | } |
3085 | } | |
3086 | else | |
3087 | { | |
3088 | /* We have some other signal, possibly a step-over dance was in | |
3089 | progress, and it should be cancelled too. */ | |
3090 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
3091 | } |
3092 | ||
3093 | /* We have all the data we need. Either report the event to GDB, or | |
3094 | resume threads and keep waiting for more. */ | |
3095 | ||
3096 | /* If we're collecting a fast tracepoint, finish the collection and | |
3097 | move out of the jump pad before delivering a signal. See | |
3098 | linux_stabilize_threads. */ | |
3099 | ||
3100 | if (WIFSTOPPED (w) | |
3101 | && WSTOPSIG (w) != SIGTRAP | |
3102 | && supports_fast_tracepoints () | |
58b4daa5 | 3103 | && agent_loaded_p ()) |
fa593d66 PA |
3104 | { |
3105 | if (debug_threads) | |
87ce2a04 DE |
3106 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
3107 | "to defer or adjust it.\n", | |
0bfdf32f | 3108 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3109 | |
3110 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 3111 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
3112 | && maybe_move_out_of_jump_pad (event_child, &w)) |
3113 | { | |
3114 | enqueue_one_deferred_signal (event_child, &w); | |
3115 | ||
3116 | if (debug_threads) | |
87ce2a04 | 3117 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 3118 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
3119 | |
3120 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
3121 | |
3122 | return ignore_event (ourstatus); | |
fa593d66 PA |
3123 | } |
3124 | } | |
219f2f23 | 3125 | |
fa593d66 PA |
3126 | if (event_child->collecting_fast_tracepoint) |
3127 | { | |
3128 | if (debug_threads) | |
87ce2a04 DE |
3129 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
3130 | "Check if we're already there.\n", | |
0bfdf32f | 3131 | lwpid_of (current_thread), |
87ce2a04 | 3132 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
3133 | |
3134 | trace_event = 1; | |
3135 | ||
3136 | event_child->collecting_fast_tracepoint | |
3137 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
3138 | ||
3139 | if (event_child->collecting_fast_tracepoint != 1) | |
3140 | { | |
3141 | /* No longer need this breakpoint. */ | |
3142 | if (event_child->exit_jump_pad_bkpt != NULL) | |
3143 | { | |
3144 | if (debug_threads) | |
87ce2a04 DE |
3145 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
3146 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
3147 | |
3148 | /* Other running threads could hit this breakpoint. | |
3149 | We don't handle moribund locations like GDB does, | |
3150 | instead we always pause all threads when removing | |
3151 | breakpoints, so that any step-over or | |
3152 | decr_pc_after_break adjustment is always taken | |
3153 | care of while the breakpoint is still | |
3154 | inserted. */ | |
3155 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
3156 | |
3157 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
3158 | event_child->exit_jump_pad_bkpt = NULL; | |
3159 | ||
3160 | unstop_all_lwps (1, event_child); | |
3161 | ||
3162 | gdb_assert (event_child->suspended >= 0); | |
3163 | } | |
3164 | } | |
3165 | ||
3166 | if (event_child->collecting_fast_tracepoint == 0) | |
3167 | { | |
3168 | if (debug_threads) | |
87ce2a04 DE |
3169 | debug_printf ("fast tracepoint finished " |
3170 | "collecting successfully.\n"); | |
fa593d66 PA |
3171 | |
3172 | /* We may have a deferred signal to report. */ | |
3173 | if (dequeue_one_deferred_signal (event_child, &w)) | |
3174 | { | |
3175 | if (debug_threads) | |
87ce2a04 | 3176 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 3177 | } |
3c11dd79 | 3178 | else |
fa593d66 | 3179 | { |
3c11dd79 | 3180 | if (debug_threads) |
87ce2a04 | 3181 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
3182 | |
3183 | if (stabilizing_threads) | |
3184 | { | |
3185 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 3186 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
3187 | |
3188 | if (debug_threads) | |
3189 | { | |
3190 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
3191 | "while stabilizing threads\n", | |
0bfdf32f | 3192 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
3193 | debug_exit (); |
3194 | } | |
3195 | ||
0bfdf32f | 3196 | return ptid_of (current_thread); |
fa593d66 PA |
3197 | } |
3198 | } | |
3199 | } | |
6bf5e0ba PA |
3200 | } |
3201 | ||
e471f25b PA |
3202 | /* Check whether GDB would be interested in this event. */ |
3203 | ||
3204 | /* If GDB is not interested in this signal, don't stop other | |
3205 | threads, and don't report it to GDB. Just resume the inferior | |
3206 | right away. We do this for threading-related signals as well as | |
3207 | any that GDB specifically requested we ignore. But never ignore | |
3208 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
3209 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
3210 | handler. Also never ignore signals that could be caused by a |
3211 | breakpoint. */ | |
e471f25b PA |
3212 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
3213 | thread library? */ | |
3214 | if (WIFSTOPPED (w) | |
0bfdf32f | 3215 | && current_thread->last_resume_kind != resume_step |
e471f25b | 3216 | && ( |
1a981360 | 3217 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 3218 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
3219 | && (WSTOPSIG (w) == __SIGRTMIN |
3220 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
3221 | || | |
3222 | #endif | |
2ea28649 | 3223 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 3224 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
3225 | && current_thread->last_resume_kind == resume_stop) |
3226 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
3227 | { |
3228 | siginfo_t info, *info_p; | |
3229 | ||
3230 | if (debug_threads) | |
87ce2a04 | 3231 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 3232 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 3233 | |
0bfdf32f | 3234 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 3235 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
3236 | info_p = &info; |
3237 | else | |
3238 | info_p = NULL; | |
863d01bd PA |
3239 | |
3240 | if (step_over_finished) | |
3241 | { | |
3242 | /* We cancelled this thread's step-over above. We still | |
3243 | need to unsuspend all other LWPs, and set them back | |
3244 | running again while the signal handler runs. */ | |
3245 | unsuspend_all_lwps (event_child); | |
3246 | ||
3247 | /* Enqueue the pending signal info so that proceed_all_lwps | |
3248 | doesn't lose it. */ | |
3249 | enqueue_pending_signal (event_child, WSTOPSIG (w), info_p); | |
3250 | ||
3251 | proceed_all_lwps (); | |
3252 | } | |
3253 | else | |
3254 | { | |
3255 | linux_resume_one_lwp (event_child, event_child->stepping, | |
3256 | WSTOPSIG (w), info_p); | |
3257 | } | |
582511be | 3258 | return ignore_event (ourstatus); |
e471f25b PA |
3259 | } |
3260 | ||
c2d6af84 PA |
3261 | /* Note that all addresses are always "out of the step range" when |
3262 | there's no range to begin with. */ | |
3263 | in_step_range = lwp_in_step_range (event_child); | |
3264 | ||
3265 | /* If GDB wanted this thread to single step, and the thread is out | |
3266 | of the step range, we always want to report the SIGTRAP, and let | |
3267 | GDB handle it. Watchpoints should always be reported. So should | |
3268 | signals we can't explain. A SIGTRAP we can't explain could be a | |
3269 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
3270 | do, we're be able to handle GDB breakpoints on top of internal | |
3271 | breakpoints, by handling the internal breakpoint and still | |
3272 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
863d01bd PA |
3273 | won't see the breakpoint hit. If we see a single-step event but |
3274 | the thread should be continuing, don't pass the trap to gdb. | |
3275 | That indicates that we had previously finished a single-step but | |
3276 | left the single-step pending -- see | |
3277 | complete_ongoing_step_over. */ | |
6bf5e0ba | 3278 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 3279 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 3280 | && !in_step_range) |
15c66dd6 | 3281 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
863d01bd PA |
3282 | || (!in_step_range |
3283 | && !bp_explains_trap | |
3284 | && !trace_event | |
3285 | && !step_over_finished | |
3286 | && !(current_thread->last_resume_kind == resume_continue | |
3287 | && event_child->stop_reason == TARGET_STOPPED_BY_SINGLE_STEP)) | |
9f3a5c85 | 3288 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 | 3289 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
de0d863e | 3290 | && gdb_no_commands_at_breakpoint (event_child->stop_pc)) |
00db26fa | 3291 | || event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE); |
d3ce09f5 SS |
3292 | |
3293 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
3294 | |
3295 | /* We found no reason GDB would want us to stop. We either hit one | |
3296 | of our own breakpoints, or finished an internal step GDB | |
3297 | shouldn't know about. */ | |
3298 | if (!report_to_gdb) | |
3299 | { | |
3300 | if (debug_threads) | |
3301 | { | |
3302 | if (bp_explains_trap) | |
87ce2a04 | 3303 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 3304 | if (step_over_finished) |
87ce2a04 | 3305 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 3306 | if (trace_event) |
87ce2a04 | 3307 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 3308 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
3309 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
3310 | paddress (event_child->stop_pc), | |
3311 | paddress (event_child->step_range_start), | |
3312 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
3313 | } |
3314 | ||
3315 | /* We're not reporting this breakpoint to GDB, so apply the | |
3316 | decr_pc_after_break adjustment to the inferior's regcache | |
3317 | ourselves. */ | |
3318 | ||
3319 | if (the_low_target.set_pc != NULL) | |
3320 | { | |
3321 | struct regcache *regcache | |
0bfdf32f | 3322 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
3323 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
3324 | } | |
3325 | ||
7984d532 PA |
3326 | /* We may have finished stepping over a breakpoint. If so, |
3327 | we've stopped and suspended all LWPs momentarily except the | |
3328 | stepping one. This is where we resume them all again. We're | |
3329 | going to keep waiting, so use proceed, which handles stepping | |
3330 | over the next breakpoint. */ | |
6bf5e0ba | 3331 | if (debug_threads) |
87ce2a04 | 3332 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
3333 | |
3334 | if (step_over_finished) | |
3335 | unsuspend_all_lwps (event_child); | |
3336 | ||
6bf5e0ba | 3337 | proceed_all_lwps (); |
582511be | 3338 | return ignore_event (ourstatus); |
6bf5e0ba PA |
3339 | } |
3340 | ||
3341 | if (debug_threads) | |
3342 | { | |
00db26fa | 3343 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
ad071a30 PA |
3344 | { |
3345 | char *str; | |
3346 | ||
3347 | str = target_waitstatus_to_string (&event_child->waitstatus); | |
3348 | debug_printf ("LWP %ld: extended event with waitstatus %s\n", | |
3349 | lwpid_of (get_lwp_thread (event_child)), str); | |
3350 | xfree (str); | |
3351 | } | |
0bfdf32f | 3352 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
3353 | { |
3354 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 3355 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 3356 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 3357 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 3358 | } |
15c66dd6 | 3359 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 3360 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 3361 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 3362 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 3363 | if (debug_threads) |
87ce2a04 | 3364 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
3365 | } |
3366 | ||
3367 | /* Alright, we're going to report a stop. */ | |
3368 | ||
582511be | 3369 | if (!stabilizing_threads) |
6bf5e0ba PA |
3370 | { |
3371 | /* In all-stop, stop all threads. */ | |
582511be PA |
3372 | if (!non_stop) |
3373 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
3374 | |
3375 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3376 | from among those that have had events. Giving equal priority | |
3377 | to all LWPs that have had events helps prevent | |
3378 | starvation. */ | |
3379 | if (ptid_equal (ptid, minus_one_ptid)) | |
3380 | { | |
3381 | event_child->status_pending_p = 1; | |
3382 | event_child->status_pending = w; | |
3383 | ||
3384 | select_event_lwp (&event_child); | |
3385 | ||
0bfdf32f GB |
3386 | /* current_thread and event_child must stay in sync. */ |
3387 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 3388 | |
6bf5e0ba PA |
3389 | event_child->status_pending_p = 0; |
3390 | w = event_child->status_pending; | |
3391 | } | |
3392 | ||
c03e6ccc | 3393 | if (step_over_finished) |
582511be PA |
3394 | { |
3395 | if (!non_stop) | |
3396 | { | |
3397 | /* If we were doing a step-over, all other threads but | |
3398 | the stepping one had been paused in start_step_over, | |
3399 | with their suspend counts incremented. We don't want | |
3400 | to do a full unstop/unpause, because we're in | |
3401 | all-stop mode (so we want threads stopped), but we | |
3402 | still need to unsuspend the other threads, to | |
3403 | decrement their `suspended' count back. */ | |
3404 | unsuspend_all_lwps (event_child); | |
3405 | } | |
3406 | else | |
3407 | { | |
3408 | /* If we just finished a step-over, then all threads had | |
3409 | been momentarily paused. In all-stop, that's fine, | |
3410 | we want threads stopped by now anyway. In non-stop, | |
3411 | we need to re-resume threads that GDB wanted to be | |
3412 | running. */ | |
3413 | unstop_all_lwps (1, event_child); | |
3414 | } | |
3415 | } | |
c03e6ccc | 3416 | |
fa593d66 | 3417 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
3418 | if (!non_stop) |
3419 | stabilize_threads (); | |
6bf5e0ba PA |
3420 | } |
3421 | else | |
3422 | { | |
3423 | /* If we just finished a step-over, then all threads had been | |
3424 | momentarily paused. In all-stop, that's fine, we want | |
3425 | threads stopped by now anyway. In non-stop, we need to | |
3426 | re-resume threads that GDB wanted to be running. */ | |
3427 | if (step_over_finished) | |
7984d532 | 3428 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3429 | } |
3430 | ||
00db26fa | 3431 | if (event_child->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
de0d863e | 3432 | { |
00db26fa PA |
3433 | /* If the reported event is an exit, fork, vfork or exec, let |
3434 | GDB know. */ | |
3435 | *ourstatus = event_child->waitstatus; | |
de0d863e DB |
3436 | /* Clear the event lwp's waitstatus since we handled it already. */ |
3437 | event_child->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3438 | } | |
3439 | else | |
3440 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
5b1c542e | 3441 | |
582511be | 3442 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3443 | it was a software breakpoint, and the client doesn't know we can |
3444 | adjust the breakpoint ourselves. */ | |
3445 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3446 | && !swbreak_feature) | |
582511be PA |
3447 | { |
3448 | int decr_pc = the_low_target.decr_pc_after_break; | |
3449 | ||
3450 | if (decr_pc != 0) | |
3451 | { | |
3452 | struct regcache *regcache | |
3453 | = get_thread_regcache (current_thread, 1); | |
3454 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3455 | } | |
3456 | } | |
3457 | ||
0bfdf32f | 3458 | if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3459 | && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
3460 | { |
3461 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3462 | and it stopped cleanly, so report as SIG0. The use of | |
3463 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3464 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3465 | } |
0bfdf32f | 3466 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3467 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3468 | { |
3469 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3470 | but, it stopped for other reasons. */ |
2ea28649 | 3471 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 | 3472 | } |
de0d863e | 3473 | else if (ourstatus->kind == TARGET_WAITKIND_STOPPED) |
bd99dc85 | 3474 | { |
2ea28649 | 3475 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3476 | } |
3477 | ||
d50171e4 PA |
3478 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3479 | ||
bd99dc85 | 3480 | if (debug_threads) |
87ce2a04 DE |
3481 | { |
3482 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3483 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3484 | ourstatus->kind, ourstatus->value.sig); |
3485 | debug_exit (); | |
3486 | } | |
bd99dc85 | 3487 | |
0bfdf32f | 3488 | return ptid_of (current_thread); |
bd99dc85 PA |
3489 | } |
3490 | ||
3491 | /* Get rid of any pending event in the pipe. */ | |
3492 | static void | |
3493 | async_file_flush (void) | |
3494 | { | |
3495 | int ret; | |
3496 | char buf; | |
3497 | ||
3498 | do | |
3499 | ret = read (linux_event_pipe[0], &buf, 1); | |
3500 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3501 | } | |
3502 | ||
3503 | /* Put something in the pipe, so the event loop wakes up. */ | |
3504 | static void | |
3505 | async_file_mark (void) | |
3506 | { | |
3507 | int ret; | |
3508 | ||
3509 | async_file_flush (); | |
3510 | ||
3511 | do | |
3512 | ret = write (linux_event_pipe[1], "+", 1); | |
3513 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3514 | ||
3515 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3516 | be awakened anyway. */ | |
3517 | } | |
3518 | ||
95954743 PA |
3519 | static ptid_t |
3520 | linux_wait (ptid_t ptid, | |
3521 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3522 | { |
95954743 | 3523 | ptid_t event_ptid; |
bd99dc85 | 3524 | |
bd99dc85 PA |
3525 | /* Flush the async file first. */ |
3526 | if (target_is_async_p ()) | |
3527 | async_file_flush (); | |
3528 | ||
582511be PA |
3529 | do |
3530 | { | |
3531 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3532 | } | |
3533 | while ((target_options & TARGET_WNOHANG) == 0 | |
3534 | && ptid_equal (event_ptid, null_ptid) | |
3535 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3536 | |
3537 | /* If at least one stop was reported, there may be more. A single | |
3538 | SIGCHLD can signal more than one child stop. */ | |
3539 | if (target_is_async_p () | |
3540 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3541 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3542 | async_file_mark (); |
3543 | ||
3544 | return event_ptid; | |
da6d8c04 DJ |
3545 | } |
3546 | ||
c5f62d5f | 3547 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3548 | |
3549 | static int | |
a1928bad | 3550 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3551 | { |
c5f62d5f DE |
3552 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3553 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3554 | |
c5f62d5f DE |
3555 | #ifdef __NR_tkill |
3556 | { | |
3557 | static int tkill_failed; | |
fd500816 | 3558 | |
c5f62d5f DE |
3559 | if (!tkill_failed) |
3560 | { | |
3561 | int ret; | |
3562 | ||
3563 | errno = 0; | |
3564 | ret = syscall (__NR_tkill, lwpid, signo); | |
3565 | if (errno != ENOSYS) | |
3566 | return ret; | |
3567 | tkill_failed = 1; | |
3568 | } | |
3569 | } | |
fd500816 DJ |
3570 | #endif |
3571 | ||
3572 | return kill (lwpid, signo); | |
3573 | } | |
3574 | ||
964e4306 PA |
3575 | void |
3576 | linux_stop_lwp (struct lwp_info *lwp) | |
3577 | { | |
3578 | send_sigstop (lwp); | |
3579 | } | |
3580 | ||
0d62e5e8 | 3581 | static void |
02fc4de7 | 3582 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3583 | { |
bd99dc85 | 3584 | int pid; |
0d62e5e8 | 3585 | |
d86d4aaf | 3586 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3587 | |
0d62e5e8 DJ |
3588 | /* If we already have a pending stop signal for this process, don't |
3589 | send another. */ | |
54a0b537 | 3590 | if (lwp->stop_expected) |
0d62e5e8 | 3591 | { |
ae13219e | 3592 | if (debug_threads) |
87ce2a04 | 3593 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3594 | |
0d62e5e8 DJ |
3595 | return; |
3596 | } | |
3597 | ||
3598 | if (debug_threads) | |
87ce2a04 | 3599 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3600 | |
d50171e4 | 3601 | lwp->stop_expected = 1; |
bd99dc85 | 3602 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3603 | } |
3604 | ||
7984d532 PA |
3605 | static int |
3606 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3607 | { |
d86d4aaf DE |
3608 | struct thread_info *thread = (struct thread_info *) entry; |
3609 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3610 | |
7984d532 PA |
3611 | /* Ignore EXCEPT. */ |
3612 | if (lwp == except) | |
3613 | return 0; | |
3614 | ||
02fc4de7 | 3615 | if (lwp->stopped) |
7984d532 | 3616 | return 0; |
02fc4de7 PA |
3617 | |
3618 | send_sigstop (lwp); | |
7984d532 PA |
3619 | return 0; |
3620 | } | |
3621 | ||
3622 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3623 | yet. */ | |
3624 | static int | |
3625 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3626 | void *except) | |
3627 | { | |
d86d4aaf DE |
3628 | struct thread_info *thread = (struct thread_info *) entry; |
3629 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3630 | |
3631 | /* Ignore EXCEPT. */ | |
3632 | if (lwp == except) | |
3633 | return 0; | |
3634 | ||
863d01bd | 3635 | lwp_suspended_inc (lwp); |
7984d532 PA |
3636 | |
3637 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3638 | } |
3639 | ||
95954743 PA |
3640 | static void |
3641 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3642 | { | |
95954743 PA |
3643 | /* Store the exit status for later. */ |
3644 | lwp->status_pending_p = 1; | |
3645 | lwp->status_pending = wstat; | |
3646 | ||
00db26fa PA |
3647 | /* Store in waitstatus as well, as there's nothing else to process |
3648 | for this event. */ | |
3649 | if (WIFEXITED (wstat)) | |
3650 | { | |
3651 | lwp->waitstatus.kind = TARGET_WAITKIND_EXITED; | |
3652 | lwp->waitstatus.value.integer = WEXITSTATUS (wstat); | |
3653 | } | |
3654 | else if (WIFSIGNALED (wstat)) | |
3655 | { | |
3656 | lwp->waitstatus.kind = TARGET_WAITKIND_SIGNALLED; | |
3657 | lwp->waitstatus.value.sig = gdb_signal_from_host (WTERMSIG (wstat)); | |
3658 | } | |
3659 | ||
95954743 PA |
3660 | /* Prevent trying to stop it. */ |
3661 | lwp->stopped = 1; | |
3662 | ||
3663 | /* No further stops are expected from a dead lwp. */ | |
3664 | lwp->stop_expected = 0; | |
3665 | } | |
3666 | ||
00db26fa PA |
3667 | /* Return true if LWP has exited already, and has a pending exit event |
3668 | to report to GDB. */ | |
3669 | ||
3670 | static int | |
3671 | lwp_is_marked_dead (struct lwp_info *lwp) | |
3672 | { | |
3673 | return (lwp->status_pending_p | |
3674 | && (WIFEXITED (lwp->status_pending) | |
3675 | || WIFSIGNALED (lwp->status_pending))); | |
3676 | } | |
3677 | ||
fa96cb38 PA |
3678 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3679 | ||
0d62e5e8 | 3680 | static void |
fa96cb38 | 3681 | wait_for_sigstop (void) |
0d62e5e8 | 3682 | { |
0bfdf32f | 3683 | struct thread_info *saved_thread; |
95954743 | 3684 | ptid_t saved_tid; |
fa96cb38 PA |
3685 | int wstat; |
3686 | int ret; | |
0d62e5e8 | 3687 | |
0bfdf32f GB |
3688 | saved_thread = current_thread; |
3689 | if (saved_thread != NULL) | |
3690 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3691 | else |
95954743 | 3692 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3693 | |
d50171e4 | 3694 | if (debug_threads) |
fa96cb38 | 3695 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3696 | |
fa96cb38 PA |
3697 | /* Passing NULL_PTID as filter indicates we want all events to be |
3698 | left pending. Eventually this returns when there are no | |
3699 | unwaited-for children left. */ | |
3700 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3701 | &wstat, __WALL); | |
3702 | gdb_assert (ret == -1); | |
0d62e5e8 | 3703 | |
0bfdf32f GB |
3704 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3705 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3706 | else |
3707 | { | |
3708 | if (debug_threads) | |
87ce2a04 | 3709 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3710 | |
f0db101d PA |
3711 | /* We can't change the current inferior behind GDB's back, |
3712 | otherwise, a subsequent command may apply to the wrong | |
3713 | process. */ | |
3714 | current_thread = NULL; | |
0d62e5e8 DJ |
3715 | } |
3716 | } | |
3717 | ||
fa593d66 PA |
3718 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3719 | move it out, because we need to report the stop event to GDB. For | |
3720 | example, if the user puts a breakpoint in the jump pad, it's | |
3721 | because she wants to debug it. */ | |
3722 | ||
3723 | static int | |
3724 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3725 | { | |
d86d4aaf DE |
3726 | struct thread_info *thread = (struct thread_info *) entry; |
3727 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 3728 | |
863d01bd PA |
3729 | if (lwp->suspended != 0) |
3730 | { | |
3731 | internal_error (__FILE__, __LINE__, | |
3732 | "LWP %ld is suspended, suspended=%d\n", | |
3733 | lwpid_of (thread), lwp->suspended); | |
3734 | } | |
fa593d66 PA |
3735 | gdb_assert (lwp->stopped); |
3736 | ||
3737 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3738 | return (supports_fast_tracepoints () | |
58b4daa5 | 3739 | && agent_loaded_p () |
fa593d66 | 3740 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3741 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3742 | || thread->last_resume_kind == resume_step) |
3743 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3744 | } | |
3745 | ||
3746 | static void | |
3747 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3748 | { | |
d86d4aaf | 3749 | struct thread_info *thread = (struct thread_info *) entry; |
f0ce0d3a | 3750 | struct thread_info *saved_thread; |
d86d4aaf | 3751 | struct lwp_info *lwp = get_thread_lwp (thread); |
fa593d66 PA |
3752 | int *wstat; |
3753 | ||
863d01bd PA |
3754 | if (lwp->suspended != 0) |
3755 | { | |
3756 | internal_error (__FILE__, __LINE__, | |
3757 | "LWP %ld is suspended, suspended=%d\n", | |
3758 | lwpid_of (thread), lwp->suspended); | |
3759 | } | |
fa593d66 PA |
3760 | gdb_assert (lwp->stopped); |
3761 | ||
f0ce0d3a PA |
3762 | /* For gdb_breakpoint_here. */ |
3763 | saved_thread = current_thread; | |
3764 | current_thread = thread; | |
3765 | ||
fa593d66 PA |
3766 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; |
3767 | ||
3768 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3769 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3770 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3771 | && thread->last_resume_kind != resume_step |
3772 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3773 | { | |
3774 | if (debug_threads) | |
87ce2a04 | 3775 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3776 | lwpid_of (thread)); |
fa593d66 PA |
3777 | |
3778 | if (wstat) | |
3779 | { | |
3780 | lwp->status_pending_p = 0; | |
3781 | enqueue_one_deferred_signal (lwp, wstat); | |
3782 | ||
3783 | if (debug_threads) | |
87ce2a04 DE |
3784 | debug_printf ("Signal %d for LWP %ld deferred " |
3785 | "(in jump pad)\n", | |
d86d4aaf | 3786 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3787 | } |
3788 | ||
3789 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3790 | } | |
3791 | else | |
863d01bd | 3792 | lwp_suspended_inc (lwp); |
f0ce0d3a PA |
3793 | |
3794 | current_thread = saved_thread; | |
fa593d66 PA |
3795 | } |
3796 | ||
3797 | static int | |
3798 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3799 | { | |
d86d4aaf DE |
3800 | struct thread_info *thread = (struct thread_info *) entry; |
3801 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 | 3802 | |
00db26fa | 3803 | if (lwp_is_marked_dead (lwp)) |
fa593d66 PA |
3804 | return 0; |
3805 | if (lwp->stopped) | |
3806 | return 0; | |
3807 | return 1; | |
3808 | } | |
3809 | ||
7984d532 PA |
3810 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3811 | If SUSPEND, then also increase the suspend count of every LWP, | |
3812 | except EXCEPT. */ | |
3813 | ||
0d62e5e8 | 3814 | static void |
7984d532 | 3815 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3816 | { |
bde24c0a PA |
3817 | /* Should not be called recursively. */ |
3818 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3819 | ||
87ce2a04 DE |
3820 | if (debug_threads) |
3821 | { | |
3822 | debug_enter (); | |
3823 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3824 | suspend ? "stop-and-suspend" : "stop", | |
3825 | except != NULL | |
d86d4aaf | 3826 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3827 | : "none"); |
3828 | } | |
3829 | ||
bde24c0a PA |
3830 | stopping_threads = (suspend |
3831 | ? STOPPING_AND_SUSPENDING_THREADS | |
3832 | : STOPPING_THREADS); | |
7984d532 PA |
3833 | |
3834 | if (suspend) | |
d86d4aaf | 3835 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3836 | else |
d86d4aaf | 3837 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3838 | wait_for_sigstop (); |
bde24c0a | 3839 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3840 | |
3841 | if (debug_threads) | |
3842 | { | |
3843 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3844 | "back to !stopping\n"); | |
3845 | debug_exit (); | |
3846 | } | |
0d62e5e8 DJ |
3847 | } |
3848 | ||
863d01bd PA |
3849 | /* Enqueue one signal in the chain of signals which need to be |
3850 | delivered to this process on next resume. */ | |
3851 | ||
3852 | static void | |
3853 | enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info) | |
3854 | { | |
8d749320 | 3855 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
863d01bd | 3856 | |
863d01bd PA |
3857 | p_sig->prev = lwp->pending_signals; |
3858 | p_sig->signal = signal; | |
3859 | if (info == NULL) | |
3860 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3861 | else | |
3862 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
3863 | lwp->pending_signals = p_sig; | |
3864 | } | |
3865 | ||
23f238d3 PA |
3866 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
3867 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 3868 | |
ce3a066d | 3869 | static void |
23f238d3 PA |
3870 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
3871 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 3872 | { |
d86d4aaf | 3873 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3874 | struct thread_info *saved_thread; |
fa593d66 | 3875 | int fast_tp_collecting; |
c06cbd92 YQ |
3876 | struct process_info *proc = get_thread_process (thread); |
3877 | ||
3878 | /* Note that target description may not be initialised | |
3879 | (proc->tdesc == NULL) at this point because the program hasn't | |
3880 | stopped at the first instruction yet. It means GDBserver skips | |
3881 | the extra traps from the wrapper program (see option --wrapper). | |
3882 | Code in this function that requires register access should be | |
3883 | guarded by proc->tdesc == NULL or something else. */ | |
0d62e5e8 | 3884 | |
54a0b537 | 3885 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3886 | return; |
3887 | ||
fa593d66 PA |
3888 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3889 | ||
3890 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3891 | ||
219f2f23 PA |
3892 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3893 | user used the "jump" command, or "set $pc = foo"). */ | |
c06cbd92 | 3894 | if (thread->while_stepping != NULL && lwp->stop_pc != get_pc (lwp)) |
219f2f23 PA |
3895 | { |
3896 | /* Collecting 'while-stepping' actions doesn't make sense | |
3897 | anymore. */ | |
d86d4aaf | 3898 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3899 | } |
3900 | ||
0d62e5e8 DJ |
3901 | /* If we have pending signals or status, and a new signal, enqueue the |
3902 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3903 | breakpoint; it will be picked up again below. */ | |
3904 | if (signal != 0 | |
fa593d66 PA |
3905 | && (lwp->status_pending_p |
3906 | || lwp->pending_signals != NULL | |
3907 | || lwp->bp_reinsert != 0 | |
3908 | || fast_tp_collecting)) | |
0d62e5e8 | 3909 | { |
8d749320 SM |
3910 | struct pending_signals *p_sig = XNEW (struct pending_signals); |
3911 | ||
54a0b537 | 3912 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3913 | p_sig->signal = signal; |
32ca6d61 DJ |
3914 | if (info == NULL) |
3915 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3916 | else | |
3917 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3918 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3919 | } |
3920 | ||
d50171e4 PA |
3921 | if (lwp->status_pending_p) |
3922 | { | |
3923 | if (debug_threads) | |
87ce2a04 DE |
3924 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3925 | " has pending status\n", | |
d86d4aaf | 3926 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3927 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3928 | return; |
3929 | } | |
0d62e5e8 | 3930 | |
0bfdf32f GB |
3931 | saved_thread = current_thread; |
3932 | current_thread = thread; | |
0d62e5e8 DJ |
3933 | |
3934 | if (debug_threads) | |
87ce2a04 | 3935 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3936 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3937 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3938 | |
3939 | /* This bit needs some thinking about. If we get a signal that | |
3940 | we must report while a single-step reinsert is still pending, | |
3941 | we often end up resuming the thread. It might be better to | |
3942 | (ew) allow a stack of pending events; then we could be sure that | |
3943 | the reinsert happened right away and not lose any signals. | |
3944 | ||
3945 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3946 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3947 | complete correctness, so it won't solve that problem. It may be |
3948 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3949 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3950 | { |
3951 | if (debug_threads) | |
87ce2a04 DE |
3952 | debug_printf (" pending reinsert at 0x%s\n", |
3953 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3954 | |
85e00e85 | 3955 | if (can_hardware_single_step ()) |
d50171e4 | 3956 | { |
fa593d66 PA |
3957 | if (fast_tp_collecting == 0) |
3958 | { | |
3959 | if (step == 0) | |
3960 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3961 | if (lwp->suspended) | |
3962 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3963 | lwp->suspended); | |
3964 | } | |
d50171e4 PA |
3965 | |
3966 | step = 1; | |
3967 | } | |
0d62e5e8 DJ |
3968 | |
3969 | /* Postpone any pending signal. It was enqueued above. */ | |
3970 | signal = 0; | |
3971 | } | |
3972 | ||
fa593d66 PA |
3973 | if (fast_tp_collecting == 1) |
3974 | { | |
3975 | if (debug_threads) | |
87ce2a04 DE |
3976 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3977 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3978 | lwpid_of (thread)); |
fa593d66 PA |
3979 | |
3980 | /* Postpone any pending signal. It was enqueued above. */ | |
3981 | signal = 0; | |
3982 | } | |
3983 | else if (fast_tp_collecting == 2) | |
3984 | { | |
3985 | if (debug_threads) | |
87ce2a04 DE |
3986 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3987 | " single-stepping\n", | |
d86d4aaf | 3988 | lwpid_of (thread)); |
fa593d66 PA |
3989 | |
3990 | if (can_hardware_single_step ()) | |
3991 | step = 1; | |
3992 | else | |
38e08fca GB |
3993 | { |
3994 | internal_error (__FILE__, __LINE__, | |
3995 | "moving out of jump pad single-stepping" | |
3996 | " not implemented on this target"); | |
3997 | } | |
fa593d66 PA |
3998 | |
3999 | /* Postpone any pending signal. It was enqueued above. */ | |
4000 | signal = 0; | |
4001 | } | |
4002 | ||
219f2f23 PA |
4003 | /* If we have while-stepping actions in this thread set it stepping. |
4004 | If we have a signal to deliver, it may or may not be set to | |
4005 | SIG_IGN, we don't know. Assume so, and allow collecting | |
4006 | while-stepping into a signal handler. A possible smart thing to | |
4007 | do would be to set an internal breakpoint at the signal return | |
4008 | address, continue, and carry on catching this while-stepping | |
4009 | action only when that breakpoint is hit. A future | |
4010 | enhancement. */ | |
d86d4aaf | 4011 | if (thread->while_stepping != NULL |
219f2f23 PA |
4012 | && can_hardware_single_step ()) |
4013 | { | |
4014 | if (debug_threads) | |
87ce2a04 | 4015 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 4016 | lwpid_of (thread)); |
219f2f23 PA |
4017 | step = 1; |
4018 | } | |
4019 | ||
c06cbd92 | 4020 | if (proc->tdesc != NULL && the_low_target.get_pc != NULL) |
0d62e5e8 | 4021 | { |
0bfdf32f | 4022 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
4023 | |
4024 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
4025 | ||
4026 | if (debug_threads) | |
4027 | { | |
4028 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
4029 | (long) lwp->stop_pc); | |
4030 | } | |
0d62e5e8 DJ |
4031 | } |
4032 | ||
fa593d66 PA |
4033 | /* If we have pending signals, consume one unless we are trying to |
4034 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
4035 | collect. */ | |
4036 | if (lwp->pending_signals != NULL | |
4037 | && lwp->bp_reinsert == 0 | |
4038 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
4039 | { |
4040 | struct pending_signals **p_sig; | |
4041 | ||
54a0b537 | 4042 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
4043 | while ((*p_sig)->prev != NULL) |
4044 | p_sig = &(*p_sig)->prev; | |
4045 | ||
4046 | signal = (*p_sig)->signal; | |
32ca6d61 | 4047 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 4048 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4049 | &(*p_sig)->info); |
32ca6d61 | 4050 | |
0d62e5e8 DJ |
4051 | free (*p_sig); |
4052 | *p_sig = NULL; | |
4053 | } | |
4054 | ||
aa5ca48f DE |
4055 | if (the_low_target.prepare_to_resume != NULL) |
4056 | the_low_target.prepare_to_resume (lwp); | |
4057 | ||
d86d4aaf | 4058 | regcache_invalidate_thread (thread); |
da6d8c04 | 4059 | errno = 0; |
54a0b537 | 4060 | lwp->stepping = step; |
d86d4aaf | 4061 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 4062 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
4063 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4064 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4065 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 4066 | |
0bfdf32f | 4067 | current_thread = saved_thread; |
da6d8c04 | 4068 | if (errno) |
23f238d3 PA |
4069 | perror_with_name ("resuming thread"); |
4070 | ||
4071 | /* Successfully resumed. Clear state that no longer makes sense, | |
4072 | and mark the LWP as running. Must not do this before resuming | |
4073 | otherwise if that fails other code will be confused. E.g., we'd | |
4074 | later try to stop the LWP and hang forever waiting for a stop | |
4075 | status. Note that we must not throw after this is cleared, | |
4076 | otherwise handle_zombie_lwp_error would get confused. */ | |
4077 | lwp->stopped = 0; | |
4078 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
4079 | } | |
4080 | ||
4081 | /* Called when we try to resume a stopped LWP and that errors out. If | |
4082 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
4083 | or about to become), discard the error, clear any pending status | |
4084 | the LWP may have, and return true (we'll collect the exit status | |
4085 | soon enough). Otherwise, return false. */ | |
4086 | ||
4087 | static int | |
4088 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
4089 | { | |
4090 | struct thread_info *thread = get_lwp_thread (lp); | |
4091 | ||
4092 | /* If we get an error after resuming the LWP successfully, we'd | |
4093 | confuse !T state for the LWP being gone. */ | |
4094 | gdb_assert (lp->stopped); | |
4095 | ||
4096 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
4097 | because even if ptrace failed with ESRCH, the tracee may be "not | |
4098 | yet fully dead", but already refusing ptrace requests. In that | |
4099 | case the tracee has 'R (Running)' state for a little bit | |
4100 | (observed in Linux 3.18). See also the note on ESRCH in the | |
4101 | ptrace(2) man page. Instead, check whether the LWP has any state | |
4102 | other than ptrace-stopped. */ | |
4103 | ||
4104 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
4105 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 4106 | { |
23f238d3 PA |
4107 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
4108 | lp->status_pending_p = 0; | |
4109 | return 1; | |
4110 | } | |
4111 | return 0; | |
4112 | } | |
4113 | ||
4114 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
4115 | disappears while we try to resume it. */ | |
3221518c | 4116 | |
23f238d3 PA |
4117 | static void |
4118 | linux_resume_one_lwp (struct lwp_info *lwp, | |
4119 | int step, int signal, siginfo_t *info) | |
4120 | { | |
4121 | TRY | |
4122 | { | |
4123 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
4124 | } | |
4125 | CATCH (ex, RETURN_MASK_ERROR) | |
4126 | { | |
4127 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
4128 | throw_exception (ex); | |
3221518c | 4129 | } |
23f238d3 | 4130 | END_CATCH |
da6d8c04 DJ |
4131 | } |
4132 | ||
2bd7c093 PA |
4133 | struct thread_resume_array |
4134 | { | |
4135 | struct thread_resume *resume; | |
4136 | size_t n; | |
4137 | }; | |
64386c31 | 4138 | |
ebcf782c DE |
4139 | /* This function is called once per thread via find_inferior. |
4140 | ARG is a pointer to a thread_resume_array struct. | |
4141 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
4142 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
4143 | |
4144 | This algorithm is O(threads * resume elements), but resume elements | |
4145 | is small (and will remain small at least until GDB supports thread | |
4146 | suspension). */ | |
ebcf782c | 4147 | |
2bd7c093 PA |
4148 | static int |
4149 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 4150 | { |
d86d4aaf DE |
4151 | struct thread_info *thread = (struct thread_info *) entry; |
4152 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4153 | int ndx; |
2bd7c093 | 4154 | struct thread_resume_array *r; |
64386c31 | 4155 | |
9a3c8263 | 4156 | r = (struct thread_resume_array *) arg; |
64386c31 | 4157 | |
2bd7c093 | 4158 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
4159 | { |
4160 | ptid_t ptid = r->resume[ndx].thread; | |
4161 | if (ptid_equal (ptid, minus_one_ptid) | |
4162 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
4163 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
4164 | of PID'. */ | |
d86d4aaf | 4165 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
4166 | && (ptid_is_pid (ptid) |
4167 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 4168 | { |
d50171e4 | 4169 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 4170 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4171 | { |
4172 | if (debug_threads) | |
87ce2a04 DE |
4173 | debug_printf ("already %s LWP %ld at GDB's request\n", |
4174 | (thread->last_status.kind | |
4175 | == TARGET_WAITKIND_STOPPED) | |
4176 | ? "stopped" | |
4177 | : "stopping", | |
d86d4aaf | 4178 | lwpid_of (thread)); |
d50171e4 PA |
4179 | |
4180 | continue; | |
4181 | } | |
4182 | ||
95954743 | 4183 | lwp->resume = &r->resume[ndx]; |
8336d594 | 4184 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 4185 | |
c2d6af84 PA |
4186 | lwp->step_range_start = lwp->resume->step_range_start; |
4187 | lwp->step_range_end = lwp->resume->step_range_end; | |
4188 | ||
fa593d66 PA |
4189 | /* If we had a deferred signal to report, dequeue one now. |
4190 | This can happen if LWP gets more than one signal while | |
4191 | trying to get out of a jump pad. */ | |
4192 | if (lwp->stopped | |
4193 | && !lwp->status_pending_p | |
4194 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
4195 | { | |
4196 | lwp->status_pending_p = 1; | |
4197 | ||
4198 | if (debug_threads) | |
87ce2a04 DE |
4199 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
4200 | "leaving status pending.\n", | |
d86d4aaf DE |
4201 | WSTOPSIG (lwp->status_pending), |
4202 | lwpid_of (thread)); | |
fa593d66 PA |
4203 | } |
4204 | ||
95954743 PA |
4205 | return 0; |
4206 | } | |
4207 | } | |
2bd7c093 PA |
4208 | |
4209 | /* No resume action for this thread. */ | |
4210 | lwp->resume = NULL; | |
64386c31 | 4211 | |
2bd7c093 | 4212 | return 0; |
5544ad89 DJ |
4213 | } |
4214 | ||
20ad9378 DE |
4215 | /* find_inferior callback for linux_resume. |
4216 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 4217 | |
bd99dc85 PA |
4218 | static int |
4219 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 4220 | { |
d86d4aaf DE |
4221 | struct thread_info *thread = (struct thread_info *) entry; |
4222 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 4223 | |
bd99dc85 PA |
4224 | /* LWPs which will not be resumed are not interesting, because |
4225 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 4226 | if (lwp->resume == NULL) |
bd99dc85 | 4227 | return 0; |
64386c31 | 4228 | |
582511be | 4229 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
4230 | * (int *) flag_p = 1; |
4231 | ||
4232 | return 0; | |
4233 | } | |
4234 | ||
4235 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
4236 | internal breakpoint that we need to step over. It assumes that any | |
4237 | required STOP_PC adjustment has already been propagated to the | |
4238 | inferior's regcache. */ | |
4239 | ||
4240 | static int | |
4241 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
4242 | { | |
d86d4aaf DE |
4243 | struct thread_info *thread = (struct thread_info *) entry; |
4244 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 4245 | struct thread_info *saved_thread; |
d50171e4 | 4246 | CORE_ADDR pc; |
c06cbd92 YQ |
4247 | struct process_info *proc = get_thread_process (thread); |
4248 | ||
4249 | /* GDBserver is skipping the extra traps from the wrapper program, | |
4250 | don't have to do step over. */ | |
4251 | if (proc->tdesc == NULL) | |
4252 | return 0; | |
d50171e4 PA |
4253 | |
4254 | /* LWPs which will not be resumed are not interesting, because we | |
4255 | might not wait for them next time through linux_wait. */ | |
4256 | ||
4257 | if (!lwp->stopped) | |
4258 | { | |
4259 | if (debug_threads) | |
87ce2a04 | 4260 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 4261 | lwpid_of (thread)); |
d50171e4 PA |
4262 | return 0; |
4263 | } | |
4264 | ||
8336d594 | 4265 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
4266 | { |
4267 | if (debug_threads) | |
87ce2a04 DE |
4268 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
4269 | " stopped\n", | |
d86d4aaf | 4270 | lwpid_of (thread)); |
d50171e4 PA |
4271 | return 0; |
4272 | } | |
4273 | ||
7984d532 PA |
4274 | gdb_assert (lwp->suspended >= 0); |
4275 | ||
4276 | if (lwp->suspended) | |
4277 | { | |
4278 | if (debug_threads) | |
87ce2a04 | 4279 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 4280 | lwpid_of (thread)); |
7984d532 PA |
4281 | return 0; |
4282 | } | |
4283 | ||
d50171e4 PA |
4284 | if (!lwp->need_step_over) |
4285 | { | |
4286 | if (debug_threads) | |
d86d4aaf | 4287 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 4288 | } |
5544ad89 | 4289 | |
bd99dc85 | 4290 | if (lwp->status_pending_p) |
d50171e4 PA |
4291 | { |
4292 | if (debug_threads) | |
87ce2a04 DE |
4293 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
4294 | " status.\n", | |
d86d4aaf | 4295 | lwpid_of (thread)); |
d50171e4 PA |
4296 | return 0; |
4297 | } | |
4298 | ||
4299 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
4300 | or we have. */ | |
4301 | pc = get_pc (lwp); | |
4302 | ||
4303 | /* If the PC has changed since we stopped, then don't do anything, | |
4304 | and let the breakpoint/tracepoint be hit. This happens if, for | |
4305 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
4306 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
4307 | command, or poked thread's registers herself. */ | |
4308 | if (pc != lwp->stop_pc) | |
4309 | { | |
4310 | if (debug_threads) | |
87ce2a04 DE |
4311 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
4312 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
4313 | lwpid_of (thread), |
4314 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
4315 | |
4316 | lwp->need_step_over = 0; | |
4317 | return 0; | |
4318 | } | |
4319 | ||
0bfdf32f GB |
4320 | saved_thread = current_thread; |
4321 | current_thread = thread; | |
d50171e4 | 4322 | |
8b07ae33 | 4323 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 4324 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 4325 | { |
8b07ae33 | 4326 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
4327 | though. If the condition is being evaluated on the target's side |
4328 | and it evaluate to false, step over this breakpoint as well. */ | |
4329 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
4330 | && gdb_condition_true_at_breakpoint (pc) |
4331 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
4332 | { |
4333 | if (debug_threads) | |
87ce2a04 DE |
4334 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
4335 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 4336 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4337 | |
0bfdf32f | 4338 | current_thread = saved_thread; |
8b07ae33 PA |
4339 | return 0; |
4340 | } | |
4341 | else | |
4342 | { | |
4343 | if (debug_threads) | |
87ce2a04 DE |
4344 | debug_printf ("Need step over [LWP %ld]? yes, " |
4345 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 4346 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 4347 | |
8b07ae33 PA |
4348 | /* We've found an lwp that needs stepping over --- return 1 so |
4349 | that find_inferior stops looking. */ | |
0bfdf32f | 4350 | current_thread = saved_thread; |
8b07ae33 PA |
4351 | |
4352 | /* If the step over is cancelled, this is set again. */ | |
4353 | lwp->need_step_over = 0; | |
4354 | return 1; | |
4355 | } | |
d50171e4 PA |
4356 | } |
4357 | ||
0bfdf32f | 4358 | current_thread = saved_thread; |
d50171e4 PA |
4359 | |
4360 | if (debug_threads) | |
87ce2a04 DE |
4361 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
4362 | " at 0x%s\n", | |
d86d4aaf | 4363 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 4364 | |
bd99dc85 | 4365 | return 0; |
5544ad89 DJ |
4366 | } |
4367 | ||
d50171e4 PA |
4368 | /* Start a step-over operation on LWP. When LWP stopped at a |
4369 | breakpoint, to make progress, we need to remove the breakpoint out | |
4370 | of the way. If we let other threads run while we do that, they may | |
4371 | pass by the breakpoint location and miss hitting it. To avoid | |
4372 | that, a step-over momentarily stops all threads while LWP is | |
4373 | single-stepped while the breakpoint is temporarily uninserted from | |
4374 | the inferior. When the single-step finishes, we reinsert the | |
4375 | breakpoint, and let all threads that are supposed to be running, | |
4376 | run again. | |
4377 | ||
4378 | On targets that don't support hardware single-step, we don't | |
4379 | currently support full software single-stepping. Instead, we only | |
4380 | support stepping over the thread event breakpoint, by asking the | |
4381 | low target where to place a reinsert breakpoint. Since this | |
4382 | routine assumes the breakpoint being stepped over is a thread event | |
4383 | breakpoint, it usually assumes the return address of the current | |
4384 | function is a good enough place to set the reinsert breakpoint. */ | |
4385 | ||
4386 | static int | |
4387 | start_step_over (struct lwp_info *lwp) | |
4388 | { | |
d86d4aaf | 4389 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 4390 | struct thread_info *saved_thread; |
d50171e4 PA |
4391 | CORE_ADDR pc; |
4392 | int step; | |
4393 | ||
4394 | if (debug_threads) | |
87ce2a04 | 4395 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 4396 | lwpid_of (thread)); |
d50171e4 | 4397 | |
7984d532 | 4398 | stop_all_lwps (1, lwp); |
863d01bd PA |
4399 | |
4400 | if (lwp->suspended != 0) | |
4401 | { | |
4402 | internal_error (__FILE__, __LINE__, | |
4403 | "LWP %ld suspended=%d\n", lwpid_of (thread), | |
4404 | lwp->suspended); | |
4405 | } | |
d50171e4 PA |
4406 | |
4407 | if (debug_threads) | |
87ce2a04 | 4408 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
4409 | |
4410 | /* Note, we should always reach here with an already adjusted PC, | |
4411 | either by GDB (if we're resuming due to GDB's request), or by our | |
4412 | caller, if we just finished handling an internal breakpoint GDB | |
4413 | shouldn't care about. */ | |
4414 | pc = get_pc (lwp); | |
4415 | ||
0bfdf32f GB |
4416 | saved_thread = current_thread; |
4417 | current_thread = thread; | |
d50171e4 PA |
4418 | |
4419 | lwp->bp_reinsert = pc; | |
4420 | uninsert_breakpoints_at (pc); | |
fa593d66 | 4421 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
4422 | |
4423 | if (can_hardware_single_step ()) | |
4424 | { | |
4425 | step = 1; | |
4426 | } | |
4427 | else | |
4428 | { | |
4429 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
4430 | set_reinsert_breakpoint (raddr); | |
4431 | step = 0; | |
4432 | } | |
4433 | ||
0bfdf32f | 4434 | current_thread = saved_thread; |
d50171e4 PA |
4435 | |
4436 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
4437 | ||
4438 | /* Require next event from this LWP. */ | |
d86d4aaf | 4439 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
4440 | return 1; |
4441 | } | |
4442 | ||
4443 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
4444 | start_step_over, if still there, and delete any reinsert | |
4445 | breakpoints we've set, on non hardware single-step targets. */ | |
4446 | ||
4447 | static int | |
4448 | finish_step_over (struct lwp_info *lwp) | |
4449 | { | |
4450 | if (lwp->bp_reinsert != 0) | |
4451 | { | |
4452 | if (debug_threads) | |
87ce2a04 | 4453 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
4454 | |
4455 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
4456 | may be no breakpoint to reinsert there by now. */ | |
4457 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 4458 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
4459 | |
4460 | lwp->bp_reinsert = 0; | |
4461 | ||
4462 | /* Delete any software-single-step reinsert breakpoints. No | |
4463 | longer needed. We don't have to worry about other threads | |
4464 | hitting this trap, and later not being able to explain it, | |
4465 | because we were stepping over a breakpoint, and we hold all | |
4466 | threads but LWP stopped while doing that. */ | |
4467 | if (!can_hardware_single_step ()) | |
4468 | delete_reinsert_breakpoints (); | |
4469 | ||
4470 | step_over_bkpt = null_ptid; | |
4471 | return 1; | |
4472 | } | |
4473 | else | |
4474 | return 0; | |
4475 | } | |
4476 | ||
863d01bd PA |
4477 | /* If there's a step over in progress, wait until all threads stop |
4478 | (that is, until the stepping thread finishes its step), and | |
4479 | unsuspend all lwps. The stepping thread ends with its status | |
4480 | pending, which is processed later when we get back to processing | |
4481 | events. */ | |
4482 | ||
4483 | static void | |
4484 | complete_ongoing_step_over (void) | |
4485 | { | |
4486 | if (!ptid_equal (step_over_bkpt, null_ptid)) | |
4487 | { | |
4488 | struct lwp_info *lwp; | |
4489 | int wstat; | |
4490 | int ret; | |
4491 | ||
4492 | if (debug_threads) | |
4493 | debug_printf ("detach: step over in progress, finish it first\n"); | |
4494 | ||
4495 | /* Passing NULL_PTID as filter indicates we want all events to | |
4496 | be left pending. Eventually this returns when there are no | |
4497 | unwaited-for children left. */ | |
4498 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
4499 | &wstat, __WALL); | |
4500 | gdb_assert (ret == -1); | |
4501 | ||
4502 | lwp = find_lwp_pid (step_over_bkpt); | |
4503 | if (lwp != NULL) | |
4504 | finish_step_over (lwp); | |
4505 | step_over_bkpt = null_ptid; | |
4506 | unsuspend_all_lwps (lwp); | |
4507 | } | |
4508 | } | |
4509 | ||
5544ad89 DJ |
4510 | /* This function is called once per thread. We check the thread's resume |
4511 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 4512 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 4513 | |
bd99dc85 PA |
4514 | For threads which we aren't explicitly told otherwise, we preserve |
4515 | the stepping flag; this is used for stepping over gdbserver-placed | |
4516 | breakpoints. | |
4517 | ||
4518 | If pending_flags was set in any thread, we queue any needed | |
4519 | signals, since we won't actually resume. We already have a pending | |
4520 | event to report, so we don't need to preserve any step requests; | |
4521 | they should be re-issued if necessary. */ | |
4522 | ||
4523 | static int | |
4524 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 4525 | { |
d86d4aaf DE |
4526 | struct thread_info *thread = (struct thread_info *) entry; |
4527 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 4528 | int step; |
d50171e4 PA |
4529 | int leave_all_stopped = * (int *) arg; |
4530 | int leave_pending; | |
5544ad89 | 4531 | |
2bd7c093 | 4532 | if (lwp->resume == NULL) |
bd99dc85 | 4533 | return 0; |
5544ad89 | 4534 | |
bd99dc85 | 4535 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 4536 | { |
bd99dc85 | 4537 | if (debug_threads) |
d86d4aaf | 4538 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4539 | |
4540 | if (!lwp->stopped) | |
4541 | { | |
4542 | if (debug_threads) | |
d86d4aaf | 4543 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4544 | |
d50171e4 PA |
4545 | /* Stop the thread, and wait for the event asynchronously, |
4546 | through the event loop. */ | |
02fc4de7 | 4547 | send_sigstop (lwp); |
bd99dc85 PA |
4548 | } |
4549 | else | |
4550 | { | |
4551 | if (debug_threads) | |
87ce2a04 | 4552 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4553 | lwpid_of (thread)); |
d50171e4 PA |
4554 | |
4555 | /* The LWP may have been stopped in an internal event that | |
4556 | was not meant to be notified back to GDB (e.g., gdbserver | |
4557 | breakpoint), so we should be reporting a stop event in | |
4558 | this case too. */ | |
4559 | ||
4560 | /* If the thread already has a pending SIGSTOP, this is a | |
4561 | no-op. Otherwise, something later will presumably resume | |
4562 | the thread and this will cause it to cancel any pending | |
4563 | operation, due to last_resume_kind == resume_stop. If | |
4564 | the thread already has a pending status to report, we | |
4565 | will still report it the next time we wait - see | |
4566 | status_pending_p_callback. */ | |
1a981360 PA |
4567 | |
4568 | /* If we already have a pending signal to report, then | |
4569 | there's no need to queue a SIGSTOP, as this means we're | |
4570 | midway through moving the LWP out of the jumppad, and we | |
4571 | will report the pending signal as soon as that is | |
4572 | finished. */ | |
4573 | if (lwp->pending_signals_to_report == NULL) | |
4574 | send_sigstop (lwp); | |
bd99dc85 | 4575 | } |
32ca6d61 | 4576 | |
bd99dc85 PA |
4577 | /* For stop requests, we're done. */ |
4578 | lwp->resume = NULL; | |
fc7238bb | 4579 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4580 | return 0; |
5544ad89 DJ |
4581 | } |
4582 | ||
bd99dc85 | 4583 | /* If this thread which is about to be resumed has a pending status, |
863d01bd PA |
4584 | then don't resume it - we can just report the pending status. |
4585 | Likewise if it is suspended, because e.g., another thread is | |
4586 | stepping past a breakpoint. Make sure to queue any signals that | |
4587 | would otherwise be sent. In all-stop mode, we do this decision | |
4588 | based on if *any* thread has a pending status. If there's a | |
4589 | thread that needs the step-over-breakpoint dance, then don't | |
4590 | resume any other thread but that particular one. */ | |
4591 | leave_pending = (lwp->suspended | |
4592 | || lwp->status_pending_p | |
4593 | || leave_all_stopped); | |
5544ad89 | 4594 | |
d50171e4 | 4595 | if (!leave_pending) |
bd99dc85 PA |
4596 | { |
4597 | if (debug_threads) | |
d86d4aaf | 4598 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4599 | |
d50171e4 | 4600 | step = (lwp->resume->kind == resume_step); |
2acc282a | 4601 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
4602 | } |
4603 | else | |
4604 | { | |
4605 | if (debug_threads) | |
d86d4aaf | 4606 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 4607 | |
bd99dc85 PA |
4608 | /* If we have a new signal, enqueue the signal. */ |
4609 | if (lwp->resume->sig != 0) | |
4610 | { | |
8d749320 SM |
4611 | struct pending_signals *p_sig = XCNEW (struct pending_signals); |
4612 | ||
bd99dc85 PA |
4613 | p_sig->prev = lwp->pending_signals; |
4614 | p_sig->signal = lwp->resume->sig; | |
bd99dc85 PA |
4615 | |
4616 | /* If this is the same signal we were previously stopped by, | |
4617 | make sure to queue its siginfo. We can ignore the return | |
4618 | value of ptrace; if it fails, we'll skip | |
4619 | PTRACE_SETSIGINFO. */ | |
4620 | if (WIFSTOPPED (lwp->last_status) | |
4621 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 4622 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4623 | &p_sig->info); |
bd99dc85 PA |
4624 | |
4625 | lwp->pending_signals = p_sig; | |
4626 | } | |
4627 | } | |
5544ad89 | 4628 | |
fc7238bb | 4629 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4630 | lwp->resume = NULL; |
5544ad89 | 4631 | return 0; |
0d62e5e8 DJ |
4632 | } |
4633 | ||
4634 | static void | |
2bd7c093 | 4635 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 4636 | { |
2bd7c093 | 4637 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 4638 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
4639 | int any_pending; |
4640 | int leave_all_stopped; | |
c6ecbae5 | 4641 | |
87ce2a04 DE |
4642 | if (debug_threads) |
4643 | { | |
4644 | debug_enter (); | |
4645 | debug_printf ("linux_resume:\n"); | |
4646 | } | |
4647 | ||
2bd7c093 | 4648 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 4649 | |
d50171e4 PA |
4650 | /* If there is a thread which would otherwise be resumed, which has |
4651 | a pending status, then don't resume any threads - we can just | |
4652 | report the pending status. Make sure to queue any signals that | |
4653 | would otherwise be sent. In non-stop mode, we'll apply this | |
4654 | logic to each thread individually. We consume all pending events | |
4655 | before considering to start a step-over (in all-stop). */ | |
4656 | any_pending = 0; | |
bd99dc85 | 4657 | if (!non_stop) |
d86d4aaf | 4658 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
4659 | |
4660 | /* If there is a thread which would otherwise be resumed, which is | |
4661 | stopped at a breakpoint that needs stepping over, then don't | |
4662 | resume any threads - have it step over the breakpoint with all | |
4663 | other threads stopped, then resume all threads again. Make sure | |
4664 | to queue any signals that would otherwise be delivered or | |
4665 | queued. */ | |
4666 | if (!any_pending && supports_breakpoints ()) | |
4667 | need_step_over | |
d86d4aaf DE |
4668 | = (struct thread_info *) find_inferior (&all_threads, |
4669 | need_step_over_p, NULL); | |
d50171e4 PA |
4670 | |
4671 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4672 | ||
4673 | if (debug_threads) | |
4674 | { | |
4675 | if (need_step_over != NULL) | |
87ce2a04 | 4676 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4677 | else if (any_pending) |
87ce2a04 DE |
4678 | debug_printf ("Not resuming, all-stop and found " |
4679 | "an LWP with pending status\n"); | |
d50171e4 | 4680 | else |
87ce2a04 | 4681 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4682 | } |
4683 | ||
4684 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4685 | otherwise deliver. */ | |
4686 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4687 | ||
4688 | if (need_step_over) | |
d86d4aaf | 4689 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4690 | |
4691 | if (debug_threads) | |
4692 | { | |
4693 | debug_printf ("linux_resume done\n"); | |
4694 | debug_exit (); | |
4695 | } | |
d50171e4 PA |
4696 | } |
4697 | ||
4698 | /* This function is called once per thread. We check the thread's | |
4699 | last resume request, which will tell us whether to resume, step, or | |
4700 | leave the thread stopped. Any signal the client requested to be | |
4701 | delivered has already been enqueued at this point. | |
4702 | ||
4703 | If any thread that GDB wants running is stopped at an internal | |
4704 | breakpoint that needs stepping over, we start a step-over operation | |
4705 | on that particular thread, and leave all others stopped. */ | |
4706 | ||
7984d532 PA |
4707 | static int |
4708 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4709 | { |
d86d4aaf DE |
4710 | struct thread_info *thread = (struct thread_info *) entry; |
4711 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4712 | int step; |
4713 | ||
7984d532 PA |
4714 | if (lwp == except) |
4715 | return 0; | |
d50171e4 PA |
4716 | |
4717 | if (debug_threads) | |
d86d4aaf | 4718 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4719 | |
4720 | if (!lwp->stopped) | |
4721 | { | |
4722 | if (debug_threads) | |
d86d4aaf | 4723 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4724 | return 0; |
d50171e4 PA |
4725 | } |
4726 | ||
02fc4de7 PA |
4727 | if (thread->last_resume_kind == resume_stop |
4728 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4729 | { |
4730 | if (debug_threads) | |
87ce2a04 | 4731 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4732 | lwpid_of (thread)); |
7984d532 | 4733 | return 0; |
d50171e4 PA |
4734 | } |
4735 | ||
4736 | if (lwp->status_pending_p) | |
4737 | { | |
4738 | if (debug_threads) | |
87ce2a04 | 4739 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4740 | lwpid_of (thread)); |
7984d532 | 4741 | return 0; |
d50171e4 PA |
4742 | } |
4743 | ||
7984d532 PA |
4744 | gdb_assert (lwp->suspended >= 0); |
4745 | ||
d50171e4 PA |
4746 | if (lwp->suspended) |
4747 | { | |
4748 | if (debug_threads) | |
d86d4aaf | 4749 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4750 | return 0; |
d50171e4 PA |
4751 | } |
4752 | ||
1a981360 PA |
4753 | if (thread->last_resume_kind == resume_stop |
4754 | && lwp->pending_signals_to_report == NULL | |
4755 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4756 | { |
4757 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4758 | last_status.kind check above would catch it, and we wouldn't | |
4759 | reach here. This LWP may have been momentarily paused by a | |
4760 | stop_all_lwps call while handling for example, another LWP's | |
4761 | step-over. In that case, the pending expected SIGSTOP signal | |
4762 | that was queued at vCont;t handling time will have already | |
4763 | been consumed by wait_for_sigstop, and so we need to requeue | |
4764 | another one here. Note that if the LWP already has a SIGSTOP | |
4765 | pending, this is a no-op. */ | |
4766 | ||
4767 | if (debug_threads) | |
87ce2a04 DE |
4768 | debug_printf ("Client wants LWP %ld to stop. " |
4769 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4770 | lwpid_of (thread)); |
02fc4de7 PA |
4771 | |
4772 | send_sigstop (lwp); | |
4773 | } | |
4774 | ||
863d01bd PA |
4775 | if (thread->last_resume_kind == resume_step) |
4776 | { | |
4777 | if (debug_threads) | |
4778 | debug_printf (" stepping LWP %ld, client wants it stepping\n", | |
4779 | lwpid_of (thread)); | |
4780 | step = 1; | |
4781 | } | |
4782 | else if (lwp->bp_reinsert != 0) | |
4783 | { | |
4784 | if (debug_threads) | |
4785 | debug_printf (" stepping LWP %ld, reinsert set\n", | |
4786 | lwpid_of (thread)); | |
4787 | step = 1; | |
4788 | } | |
4789 | else | |
4790 | step = 0; | |
4791 | ||
d50171e4 | 4792 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4793 | return 0; |
4794 | } | |
4795 | ||
4796 | static int | |
4797 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4798 | { | |
d86d4aaf DE |
4799 | struct thread_info *thread = (struct thread_info *) entry; |
4800 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4801 | |
4802 | if (lwp == except) | |
4803 | return 0; | |
4804 | ||
863d01bd | 4805 | lwp_suspended_decr (lwp); |
7984d532 PA |
4806 | |
4807 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4808 | } |
4809 | ||
4810 | /* When we finish a step-over, set threads running again. If there's | |
4811 | another thread that may need a step-over, now's the time to start | |
4812 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4813 | ||
4814 | static void | |
4815 | proceed_all_lwps (void) | |
4816 | { | |
d86d4aaf | 4817 | struct thread_info *need_step_over; |
d50171e4 PA |
4818 | |
4819 | /* If there is a thread which would otherwise be resumed, which is | |
4820 | stopped at a breakpoint that needs stepping over, then don't | |
4821 | resume any threads - have it step over the breakpoint with all | |
4822 | other threads stopped, then resume all threads again. */ | |
4823 | ||
4824 | if (supports_breakpoints ()) | |
4825 | { | |
4826 | need_step_over | |
d86d4aaf DE |
4827 | = (struct thread_info *) find_inferior (&all_threads, |
4828 | need_step_over_p, NULL); | |
d50171e4 PA |
4829 | |
4830 | if (need_step_over != NULL) | |
4831 | { | |
4832 | if (debug_threads) | |
87ce2a04 DE |
4833 | debug_printf ("proceed_all_lwps: found " |
4834 | "thread %ld needing a step-over\n", | |
4835 | lwpid_of (need_step_over)); | |
d50171e4 | 4836 | |
d86d4aaf | 4837 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4838 | return; |
4839 | } | |
4840 | } | |
5544ad89 | 4841 | |
d50171e4 | 4842 | if (debug_threads) |
87ce2a04 | 4843 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4844 | |
d86d4aaf | 4845 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4846 | } |
4847 | ||
4848 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4849 | pending statuses, are set to run again, except for EXCEPT, if not | |
4850 | NULL. This undoes a stop_all_lwps call. */ | |
4851 | ||
4852 | static void | |
7984d532 | 4853 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4854 | { |
5544ad89 DJ |
4855 | if (debug_threads) |
4856 | { | |
87ce2a04 | 4857 | debug_enter (); |
d50171e4 | 4858 | if (except) |
87ce2a04 | 4859 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4860 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4861 | else |
87ce2a04 | 4862 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4863 | } |
4864 | ||
7984d532 | 4865 | if (unsuspend) |
d86d4aaf | 4866 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4867 | else |
d86d4aaf | 4868 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4869 | |
4870 | if (debug_threads) | |
4871 | { | |
4872 | debug_printf ("unstop_all_lwps done\n"); | |
4873 | debug_exit (); | |
4874 | } | |
0d62e5e8 DJ |
4875 | } |
4876 | ||
58caa3dc DJ |
4877 | |
4878 | #ifdef HAVE_LINUX_REGSETS | |
4879 | ||
1faeff08 MR |
4880 | #define use_linux_regsets 1 |
4881 | ||
030031ee PA |
4882 | /* Returns true if REGSET has been disabled. */ |
4883 | ||
4884 | static int | |
4885 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4886 | { | |
4887 | return (info->disabled_regsets != NULL | |
4888 | && info->disabled_regsets[regset - info->regsets]); | |
4889 | } | |
4890 | ||
4891 | /* Disable REGSET. */ | |
4892 | ||
4893 | static void | |
4894 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4895 | { | |
4896 | int dr_offset; | |
4897 | ||
4898 | dr_offset = regset - info->regsets; | |
4899 | if (info->disabled_regsets == NULL) | |
224c3ddb | 4900 | info->disabled_regsets = (char *) xcalloc (1, info->num_regsets); |
030031ee PA |
4901 | info->disabled_regsets[dr_offset] = 1; |
4902 | } | |
4903 | ||
58caa3dc | 4904 | static int |
3aee8918 PA |
4905 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4906 | struct regcache *regcache) | |
58caa3dc DJ |
4907 | { |
4908 | struct regset_info *regset; | |
e9d25b98 | 4909 | int saw_general_regs = 0; |
95954743 | 4910 | int pid; |
1570b33e | 4911 | struct iovec iov; |
58caa3dc | 4912 | |
0bfdf32f | 4913 | pid = lwpid_of (current_thread); |
28eef672 | 4914 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4915 | { |
1570b33e L |
4916 | void *buf, *data; |
4917 | int nt_type, res; | |
58caa3dc | 4918 | |
030031ee | 4919 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4920 | continue; |
58caa3dc | 4921 | |
bca929d3 | 4922 | buf = xmalloc (regset->size); |
1570b33e L |
4923 | |
4924 | nt_type = regset->nt_type; | |
4925 | if (nt_type) | |
4926 | { | |
4927 | iov.iov_base = buf; | |
4928 | iov.iov_len = regset->size; | |
4929 | data = (void *) &iov; | |
4930 | } | |
4931 | else | |
4932 | data = buf; | |
4933 | ||
dfb64f85 | 4934 | #ifndef __sparc__ |
f15f9948 | 4935 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4936 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4937 | #else |
1570b33e | 4938 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4939 | #endif |
58caa3dc DJ |
4940 | if (res < 0) |
4941 | { | |
4942 | if (errno == EIO) | |
4943 | { | |
52fa2412 | 4944 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4945 | this process mode. */ |
030031ee | 4946 | disable_regset (regsets_info, regset); |
58caa3dc | 4947 | } |
e5a9158d AA |
4948 | else if (errno == ENODATA) |
4949 | { | |
4950 | /* ENODATA may be returned if the regset is currently | |
4951 | not "active". This can happen in normal operation, | |
4952 | so suppress the warning in this case. */ | |
4953 | } | |
58caa3dc DJ |
4954 | else |
4955 | { | |
0d62e5e8 | 4956 | char s[256]; |
95954743 PA |
4957 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4958 | pid); | |
0d62e5e8 | 4959 | perror (s); |
58caa3dc DJ |
4960 | } |
4961 | } | |
098dbe61 AA |
4962 | else |
4963 | { | |
4964 | if (regset->type == GENERAL_REGS) | |
4965 | saw_general_regs = 1; | |
4966 | regset->store_function (regcache, buf); | |
4967 | } | |
fdeb2a12 | 4968 | free (buf); |
58caa3dc | 4969 | } |
e9d25b98 DJ |
4970 | if (saw_general_regs) |
4971 | return 0; | |
4972 | else | |
4973 | return 1; | |
58caa3dc DJ |
4974 | } |
4975 | ||
4976 | static int | |
3aee8918 PA |
4977 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4978 | struct regcache *regcache) | |
58caa3dc DJ |
4979 | { |
4980 | struct regset_info *regset; | |
e9d25b98 | 4981 | int saw_general_regs = 0; |
95954743 | 4982 | int pid; |
1570b33e | 4983 | struct iovec iov; |
58caa3dc | 4984 | |
0bfdf32f | 4985 | pid = lwpid_of (current_thread); |
28eef672 | 4986 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4987 | { |
1570b33e L |
4988 | void *buf, *data; |
4989 | int nt_type, res; | |
58caa3dc | 4990 | |
feea5f36 AA |
4991 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
4992 | || regset->fill_function == NULL) | |
28eef672 | 4993 | continue; |
58caa3dc | 4994 | |
bca929d3 | 4995 | buf = xmalloc (regset->size); |
545587ee DJ |
4996 | |
4997 | /* First fill the buffer with the current register set contents, | |
4998 | in case there are any items in the kernel's regset that are | |
4999 | not in gdbserver's regcache. */ | |
1570b33e L |
5000 | |
5001 | nt_type = regset->nt_type; | |
5002 | if (nt_type) | |
5003 | { | |
5004 | iov.iov_base = buf; | |
5005 | iov.iov_len = regset->size; | |
5006 | data = (void *) &iov; | |
5007 | } | |
5008 | else | |
5009 | data = buf; | |
5010 | ||
dfb64f85 | 5011 | #ifndef __sparc__ |
f15f9948 | 5012 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 5013 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5014 | #else |
689cc2ae | 5015 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 5016 | #endif |
545587ee DJ |
5017 | |
5018 | if (res == 0) | |
5019 | { | |
5020 | /* Then overlay our cached registers on that. */ | |
442ea881 | 5021 | regset->fill_function (regcache, buf); |
545587ee DJ |
5022 | |
5023 | /* Only now do we write the register set. */ | |
dfb64f85 | 5024 | #ifndef __sparc__ |
f15f9948 | 5025 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 5026 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 5027 | #else |
1570b33e | 5028 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 5029 | #endif |
545587ee DJ |
5030 | } |
5031 | ||
58caa3dc DJ |
5032 | if (res < 0) |
5033 | { | |
5034 | if (errno == EIO) | |
5035 | { | |
52fa2412 | 5036 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 5037 | this process mode. */ |
030031ee | 5038 | disable_regset (regsets_info, regset); |
58caa3dc | 5039 | } |
3221518c UW |
5040 | else if (errno == ESRCH) |
5041 | { | |
1b3f6016 PA |
5042 | /* At this point, ESRCH should mean the process is |
5043 | already gone, in which case we simply ignore attempts | |
5044 | to change its registers. See also the related | |
5045 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 5046 | free (buf); |
3221518c UW |
5047 | return 0; |
5048 | } | |
58caa3dc DJ |
5049 | else |
5050 | { | |
ce3a066d | 5051 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
5052 | } |
5053 | } | |
e9d25b98 DJ |
5054 | else if (regset->type == GENERAL_REGS) |
5055 | saw_general_regs = 1; | |
09ec9b38 | 5056 | free (buf); |
58caa3dc | 5057 | } |
e9d25b98 DJ |
5058 | if (saw_general_regs) |
5059 | return 0; | |
5060 | else | |
5061 | return 1; | |
58caa3dc DJ |
5062 | } |
5063 | ||
1faeff08 | 5064 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 5065 | |
1faeff08 | 5066 | #define use_linux_regsets 0 |
3aee8918 PA |
5067 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
5068 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 5069 | |
58caa3dc | 5070 | #endif |
1faeff08 MR |
5071 | |
5072 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
5073 | calls or 0 if it has to be transferred individually. */ | |
5074 | ||
5075 | static int | |
3aee8918 | 5076 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
5077 | { |
5078 | unsigned char mask = 1 << (regno % 8); | |
5079 | size_t index = regno / 8; | |
5080 | ||
5081 | return (use_linux_regsets | |
3aee8918 PA |
5082 | && (regs_info->regset_bitmap == NULL |
5083 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
5084 | } |
5085 | ||
58caa3dc | 5086 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
5087 | |
5088 | int | |
3aee8918 | 5089 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
5090 | { |
5091 | int addr; | |
5092 | ||
3aee8918 | 5093 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
5094 | error ("Invalid register number %d.", regnum); |
5095 | ||
3aee8918 | 5096 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
5097 | |
5098 | return addr; | |
5099 | } | |
5100 | ||
5101 | /* Fetch one register. */ | |
5102 | static void | |
3aee8918 PA |
5103 | fetch_register (const struct usrregs_info *usrregs, |
5104 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5105 | { |
5106 | CORE_ADDR regaddr; | |
5107 | int i, size; | |
5108 | char *buf; | |
5109 | int pid; | |
5110 | ||
3aee8918 | 5111 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5112 | return; |
5113 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
5114 | return; | |
5115 | ||
3aee8918 | 5116 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5117 | if (regaddr == -1) |
5118 | return; | |
5119 | ||
3aee8918 PA |
5120 | size = ((register_size (regcache->tdesc, regno) |
5121 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5122 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5123 | buf = (char *) alloca (size); |
1faeff08 | 5124 | |
0bfdf32f | 5125 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5126 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5127 | { | |
5128 | errno = 0; | |
5129 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
5130 | ptrace (PTRACE_PEEKUSER, pid, | |
5131 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5132 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5133 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
5134 | regaddr += sizeof (PTRACE_XFER_TYPE); |
5135 | if (errno != 0) | |
5136 | error ("reading register %d: %s", regno, strerror (errno)); | |
5137 | } | |
5138 | ||
5139 | if (the_low_target.supply_ptrace_register) | |
5140 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
5141 | else | |
5142 | supply_register (regcache, regno, buf); | |
5143 | } | |
5144 | ||
5145 | /* Store one register. */ | |
5146 | static void | |
3aee8918 PA |
5147 | store_register (const struct usrregs_info *usrregs, |
5148 | struct regcache *regcache, int regno) | |
1faeff08 MR |
5149 | { |
5150 | CORE_ADDR regaddr; | |
5151 | int i, size; | |
5152 | char *buf; | |
5153 | int pid; | |
5154 | ||
3aee8918 | 5155 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
5156 | return; |
5157 | if ((*the_low_target.cannot_store_register) (regno)) | |
5158 | return; | |
5159 | ||
3aee8918 | 5160 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
5161 | if (regaddr == -1) |
5162 | return; | |
5163 | ||
3aee8918 PA |
5164 | size = ((register_size (regcache->tdesc, regno) |
5165 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 | 5166 | & -sizeof (PTRACE_XFER_TYPE)); |
224c3ddb | 5167 | buf = (char *) alloca (size); |
1faeff08 MR |
5168 | memset (buf, 0, size); |
5169 | ||
5170 | if (the_low_target.collect_ptrace_register) | |
5171 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
5172 | else | |
5173 | collect_register (regcache, regno, buf); | |
5174 | ||
0bfdf32f | 5175 | pid = lwpid_of (current_thread); |
1faeff08 MR |
5176 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
5177 | { | |
5178 | errno = 0; | |
5179 | ptrace (PTRACE_POKEUSER, pid, | |
5180 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5181 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5182 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
5183 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
5184 | if (errno != 0) |
5185 | { | |
5186 | /* At this point, ESRCH should mean the process is | |
5187 | already gone, in which case we simply ignore attempts | |
5188 | to change its registers. See also the related | |
5189 | comment in linux_resume_one_lwp. */ | |
5190 | if (errno == ESRCH) | |
5191 | return; | |
5192 | ||
5193 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
5194 | error ("writing register %d: %s", regno, strerror (errno)); | |
5195 | } | |
5196 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
5197 | } | |
5198 | } | |
5199 | ||
5200 | /* Fetch all registers, or just one, from the child process. | |
5201 | If REGNO is -1, do this for all registers, skipping any that are | |
5202 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
5203 | unless ALL is non-zero. | |
5204 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5205 | static void | |
3aee8918 PA |
5206 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
5207 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5208 | { |
3aee8918 PA |
5209 | struct usrregs_info *usr = regs_info->usrregs; |
5210 | ||
1faeff08 MR |
5211 | if (regno == -1) |
5212 | { | |
3aee8918 PA |
5213 | for (regno = 0; regno < usr->num_regs; regno++) |
5214 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5215 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
5216 | } |
5217 | else | |
3aee8918 | 5218 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
5219 | } |
5220 | ||
5221 | /* Store our register values back into the inferior. | |
5222 | If REGNO is -1, do this for all registers, skipping any that are | |
5223 | assumed to have been saved by regsets_store_inferior_registers, | |
5224 | unless ALL is non-zero. | |
5225 | Otherwise, REGNO specifies which register (so we can save time). */ | |
5226 | static void | |
3aee8918 PA |
5227 | usr_store_inferior_registers (const struct regs_info *regs_info, |
5228 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 5229 | { |
3aee8918 PA |
5230 | struct usrregs_info *usr = regs_info->usrregs; |
5231 | ||
1faeff08 MR |
5232 | if (regno == -1) |
5233 | { | |
3aee8918 PA |
5234 | for (regno = 0; regno < usr->num_regs; regno++) |
5235 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
5236 | store_register (usr, regcache, regno); | |
1faeff08 MR |
5237 | } |
5238 | else | |
3aee8918 | 5239 | store_register (usr, regcache, regno); |
1faeff08 MR |
5240 | } |
5241 | ||
5242 | #else /* !HAVE_LINUX_USRREGS */ | |
5243 | ||
3aee8918 PA |
5244 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
5245 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 5246 | |
58caa3dc | 5247 | #endif |
1faeff08 MR |
5248 | |
5249 | ||
5250 | void | |
5251 | linux_fetch_registers (struct regcache *regcache, int regno) | |
5252 | { | |
5253 | int use_regsets; | |
5254 | int all = 0; | |
3aee8918 | 5255 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5256 | |
5257 | if (regno == -1) | |
5258 | { | |
3aee8918 PA |
5259 | if (the_low_target.fetch_register != NULL |
5260 | && regs_info->usrregs != NULL) | |
5261 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
5262 | (*the_low_target.fetch_register) (regcache, regno); |
5263 | ||
3aee8918 PA |
5264 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
5265 | if (regs_info->usrregs != NULL) | |
5266 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
5267 | } |
5268 | else | |
5269 | { | |
c14dfd32 PA |
5270 | if (the_low_target.fetch_register != NULL |
5271 | && (*the_low_target.fetch_register) (regcache, regno)) | |
5272 | return; | |
5273 | ||
3aee8918 | 5274 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5275 | if (use_regsets) |
3aee8918 PA |
5276 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
5277 | regcache); | |
5278 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5279 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5280 | } |
58caa3dc DJ |
5281 | } |
5282 | ||
5283 | void | |
442ea881 | 5284 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 5285 | { |
1faeff08 MR |
5286 | int use_regsets; |
5287 | int all = 0; | |
3aee8918 | 5288 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
5289 | |
5290 | if (regno == -1) | |
5291 | { | |
3aee8918 PA |
5292 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5293 | regcache); | |
5294 | if (regs_info->usrregs != NULL) | |
5295 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
5296 | } |
5297 | else | |
5298 | { | |
3aee8918 | 5299 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 5300 | if (use_regsets) |
3aee8918 PA |
5301 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
5302 | regcache); | |
5303 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
5304 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 5305 | } |
58caa3dc DJ |
5306 | } |
5307 | ||
da6d8c04 | 5308 | |
da6d8c04 DJ |
5309 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
5310 | to debugger memory starting at MYADDR. */ | |
5311 | ||
c3e735a6 | 5312 | static int |
f450004a | 5313 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 5314 | { |
0bfdf32f | 5315 | int pid = lwpid_of (current_thread); |
4934b29e MR |
5316 | register PTRACE_XFER_TYPE *buffer; |
5317 | register CORE_ADDR addr; | |
5318 | register int count; | |
5319 | char filename[64]; | |
da6d8c04 | 5320 | register int i; |
4934b29e | 5321 | int ret; |
fd462a61 | 5322 | int fd; |
fd462a61 DJ |
5323 | |
5324 | /* Try using /proc. Don't bother for one word. */ | |
5325 | if (len >= 3 * sizeof (long)) | |
5326 | { | |
4934b29e MR |
5327 | int bytes; |
5328 | ||
fd462a61 DJ |
5329 | /* We could keep this file open and cache it - possibly one per |
5330 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 5331 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
5332 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
5333 | if (fd == -1) | |
5334 | goto no_proc; | |
5335 | ||
5336 | /* If pread64 is available, use it. It's faster if the kernel | |
5337 | supports it (only one syscall), and it's 64-bit safe even on | |
5338 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5339 | application). */ | |
5340 | #ifdef HAVE_PREAD64 | |
4934b29e | 5341 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 5342 | #else |
4934b29e MR |
5343 | bytes = -1; |
5344 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
5345 | bytes = read (fd, myaddr, len); | |
fd462a61 | 5346 | #endif |
fd462a61 DJ |
5347 | |
5348 | close (fd); | |
4934b29e MR |
5349 | if (bytes == len) |
5350 | return 0; | |
5351 | ||
5352 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
5353 | if (bytes > 0) | |
5354 | { | |
5355 | memaddr += bytes; | |
5356 | myaddr += bytes; | |
5357 | len -= bytes; | |
5358 | } | |
fd462a61 | 5359 | } |
da6d8c04 | 5360 | |
fd462a61 | 5361 | no_proc: |
4934b29e MR |
5362 | /* Round starting address down to longword boundary. */ |
5363 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5364 | /* Round ending address up; get number of longwords that makes. */ | |
5365 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
5366 | / sizeof (PTRACE_XFER_TYPE)); | |
5367 | /* Allocate buffer of that many longwords. */ | |
8d749320 | 5368 | buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
4934b29e | 5369 | |
da6d8c04 | 5370 | /* Read all the longwords */ |
4934b29e | 5371 | errno = 0; |
da6d8c04 DJ |
5372 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
5373 | { | |
14ce3065 DE |
5374 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5375 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5376 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5377 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5378 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 5379 | if (errno) |
4934b29e | 5380 | break; |
da6d8c04 | 5381 | } |
4934b29e | 5382 | ret = errno; |
da6d8c04 DJ |
5383 | |
5384 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
5385 | if (i > 0) |
5386 | { | |
5387 | i *= sizeof (PTRACE_XFER_TYPE); | |
5388 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
5389 | memcpy (myaddr, | |
5390 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
5391 | i < len ? i : len); | |
5392 | } | |
c3e735a6 | 5393 | |
4934b29e | 5394 | return ret; |
da6d8c04 DJ |
5395 | } |
5396 | ||
93ae6fdc PA |
5397 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
5398 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 5399 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 5400 | |
ce3a066d | 5401 | static int |
f450004a | 5402 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
5403 | { |
5404 | register int i; | |
5405 | /* Round starting address down to longword boundary. */ | |
5406 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
5407 | /* Round ending address up; get number of longwords that makes. */ | |
5408 | register int count | |
493e2a69 MS |
5409 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
5410 | / sizeof (PTRACE_XFER_TYPE); | |
5411 | ||
da6d8c04 | 5412 | /* Allocate buffer of that many longwords. */ |
8d749320 | 5413 | register PTRACE_XFER_TYPE *buffer = XALLOCAVEC (PTRACE_XFER_TYPE, count); |
493e2a69 | 5414 | |
0bfdf32f | 5415 | int pid = lwpid_of (current_thread); |
da6d8c04 | 5416 | |
f0ae6fc3 PA |
5417 | if (len == 0) |
5418 | { | |
5419 | /* Zero length write always succeeds. */ | |
5420 | return 0; | |
5421 | } | |
5422 | ||
0d62e5e8 DJ |
5423 | if (debug_threads) |
5424 | { | |
58d6951d | 5425 | /* Dump up to four bytes. */ |
bf47e248 PA |
5426 | char str[4 * 2 + 1]; |
5427 | char *p = str; | |
5428 | int dump = len < 4 ? len : 4; | |
5429 | ||
5430 | for (i = 0; i < dump; i++) | |
5431 | { | |
5432 | sprintf (p, "%02x", myaddr[i]); | |
5433 | p += 2; | |
5434 | } | |
5435 | *p = '\0'; | |
5436 | ||
5437 | debug_printf ("Writing %s to 0x%08lx in process %d\n", | |
5438 | str, (long) memaddr, pid); | |
0d62e5e8 DJ |
5439 | } |
5440 | ||
da6d8c04 DJ |
5441 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
5442 | ||
93ae6fdc | 5443 | errno = 0; |
14ce3065 DE |
5444 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
5445 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
5446 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
5447 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5448 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
5449 | if (errno) |
5450 | return errno; | |
da6d8c04 DJ |
5451 | |
5452 | if (count > 1) | |
5453 | { | |
93ae6fdc | 5454 | errno = 0; |
da6d8c04 | 5455 | buffer[count - 1] |
95954743 | 5456 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
5457 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
5458 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 5459 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 5460 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 5461 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
5462 | if (errno) |
5463 | return errno; | |
da6d8c04 DJ |
5464 | } |
5465 | ||
93ae6fdc | 5466 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 5467 | |
493e2a69 MS |
5468 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
5469 | myaddr, len); | |
da6d8c04 DJ |
5470 | |
5471 | /* Write the entire buffer. */ | |
5472 | ||
5473 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
5474 | { | |
5475 | errno = 0; | |
14ce3065 DE |
5476 | ptrace (PTRACE_POKETEXT, pid, |
5477 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
5478 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
5479 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
5480 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
5481 | if (errno) |
5482 | return errno; | |
5483 | } | |
5484 | ||
5485 | return 0; | |
5486 | } | |
2f2893d9 DJ |
5487 | |
5488 | static void | |
5489 | linux_look_up_symbols (void) | |
5490 | { | |
0d62e5e8 | 5491 | #ifdef USE_THREAD_DB |
95954743 PA |
5492 | struct process_info *proc = current_process (); |
5493 | ||
fe978cb0 | 5494 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
5495 | return; |
5496 | ||
96d7229d LM |
5497 | /* If the kernel supports tracing clones, then we don't need to |
5498 | use the magic thread event breakpoint to learn about | |
5499 | threads. */ | |
5500 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
5501 | #endif |
5502 | } | |
5503 | ||
e5379b03 | 5504 | static void |
ef57601b | 5505 | linux_request_interrupt (void) |
e5379b03 | 5506 | { |
a1928bad | 5507 | extern unsigned long signal_pid; |
e5379b03 | 5508 | |
78708b7c PA |
5509 | /* Send a SIGINT to the process group. This acts just like the user |
5510 | typed a ^C on the controlling terminal. */ | |
5511 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
5512 | } |
5513 | ||
aa691b87 RM |
5514 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
5515 | to debugger memory starting at MYADDR. */ | |
5516 | ||
5517 | static int | |
f450004a | 5518 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
5519 | { |
5520 | char filename[PATH_MAX]; | |
5521 | int fd, n; | |
0bfdf32f | 5522 | int pid = lwpid_of (current_thread); |
aa691b87 | 5523 | |
6cebaf6e | 5524 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
5525 | |
5526 | fd = open (filename, O_RDONLY); | |
5527 | if (fd < 0) | |
5528 | return -1; | |
5529 | ||
5530 | if (offset != (CORE_ADDR) 0 | |
5531 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5532 | n = -1; | |
5533 | else | |
5534 | n = read (fd, myaddr, len); | |
5535 | ||
5536 | close (fd); | |
5537 | ||
5538 | return n; | |
5539 | } | |
5540 | ||
d993e290 PA |
5541 | /* These breakpoint and watchpoint related wrapper functions simply |
5542 | pass on the function call if the target has registered a | |
5543 | corresponding function. */ | |
e013ee27 OF |
5544 | |
5545 | static int | |
802e8e6d PA |
5546 | linux_supports_z_point_type (char z_type) |
5547 | { | |
5548 | return (the_low_target.supports_z_point_type != NULL | |
5549 | && the_low_target.supports_z_point_type (z_type)); | |
5550 | } | |
5551 | ||
5552 | static int | |
5553 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
5554 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5555 | { |
c8f4bfdd YQ |
5556 | if (type == raw_bkpt_type_sw) |
5557 | return insert_memory_breakpoint (bp); | |
5558 | else if (the_low_target.insert_point != NULL) | |
802e8e6d | 5559 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5560 | else |
5561 | /* Unsupported (see target.h). */ | |
5562 | return 1; | |
5563 | } | |
5564 | ||
5565 | static int | |
802e8e6d PA |
5566 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
5567 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5568 | { |
c8f4bfdd YQ |
5569 | if (type == raw_bkpt_type_sw) |
5570 | return remove_memory_breakpoint (bp); | |
5571 | else if (the_low_target.remove_point != NULL) | |
802e8e6d | 5572 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5573 | else |
5574 | /* Unsupported (see target.h). */ | |
5575 | return 1; | |
5576 | } | |
5577 | ||
3e572f71 PA |
5578 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
5579 | method. */ | |
5580 | ||
5581 | static int | |
5582 | linux_stopped_by_sw_breakpoint (void) | |
5583 | { | |
5584 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5585 | ||
5586 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5587 | } | |
5588 | ||
5589 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
5590 | method. */ | |
5591 | ||
5592 | static int | |
5593 | linux_supports_stopped_by_sw_breakpoint (void) | |
5594 | { | |
5595 | return USE_SIGTRAP_SIGINFO; | |
5596 | } | |
5597 | ||
5598 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
5599 | method. */ | |
5600 | ||
5601 | static int | |
5602 | linux_stopped_by_hw_breakpoint (void) | |
5603 | { | |
5604 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5605 | ||
5606 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5607 | } | |
5608 | ||
5609 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
5610 | method. */ | |
5611 | ||
5612 | static int | |
5613 | linux_supports_stopped_by_hw_breakpoint (void) | |
5614 | { | |
5615 | return USE_SIGTRAP_SIGINFO; | |
5616 | } | |
5617 | ||
70b90b91 | 5618 | /* Implement the supports_hardware_single_step target_ops method. */ |
45614f15 YQ |
5619 | |
5620 | static int | |
70b90b91 | 5621 | linux_supports_hardware_single_step (void) |
45614f15 | 5622 | { |
45614f15 YQ |
5623 | return can_hardware_single_step (); |
5624 | } | |
5625 | ||
e013ee27 OF |
5626 | static int |
5627 | linux_stopped_by_watchpoint (void) | |
5628 | { | |
0bfdf32f | 5629 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5630 | |
15c66dd6 | 5631 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5632 | } |
5633 | ||
5634 | static CORE_ADDR | |
5635 | linux_stopped_data_address (void) | |
5636 | { | |
0bfdf32f | 5637 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5638 | |
5639 | return lwp->stopped_data_address; | |
e013ee27 OF |
5640 | } |
5641 | ||
db0dfaa0 LM |
5642 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5643 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5644 | && defined(PT_TEXT_END_ADDR) | |
5645 | ||
5646 | /* This is only used for targets that define PT_TEXT_ADDR, | |
5647 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5648 | the target has different ways of acquiring this information, like | |
5649 | loadmaps. */ | |
52fb6437 NS |
5650 | |
5651 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
5652 | to tell gdb about. */ | |
5653 | ||
5654 | static int | |
5655 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
5656 | { | |
52fb6437 | 5657 | unsigned long text, text_end, data; |
62828379 | 5658 | int pid = lwpid_of (current_thread); |
52fb6437 NS |
5659 | |
5660 | errno = 0; | |
5661 | ||
b8e1b30e LM |
5662 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5663 | (PTRACE_TYPE_ARG4) 0); | |
5664 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5665 | (PTRACE_TYPE_ARG4) 0); | |
5666 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5667 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5668 | |
5669 | if (errno == 0) | |
5670 | { | |
5671 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5672 | used by gdb) are relative to the beginning of the program, |
5673 | with the data segment immediately following the text segment. | |
5674 | However, the actual runtime layout in memory may put the data | |
5675 | somewhere else, so when we send gdb a data base-address, we | |
5676 | use the real data base address and subtract the compile-time | |
5677 | data base-address from it (which is just the length of the | |
5678 | text segment). BSS immediately follows data in both | |
5679 | cases. */ | |
52fb6437 NS |
5680 | *text_p = text; |
5681 | *data_p = data - (text_end - text); | |
1b3f6016 | 5682 | |
52fb6437 NS |
5683 | return 1; |
5684 | } | |
52fb6437 NS |
5685 | return 0; |
5686 | } | |
5687 | #endif | |
5688 | ||
07e059b5 VP |
5689 | static int |
5690 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
5691 | unsigned char *readbuf, unsigned const char *writebuf, |
5692 | CORE_ADDR offset, int len) | |
07e059b5 | 5693 | { |
d26e3629 | 5694 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5695 | } |
5696 | ||
d0722149 DE |
5697 | /* Convert a native/host siginfo object, into/from the siginfo in the |
5698 | layout of the inferiors' architecture. */ | |
5699 | ||
5700 | static void | |
a5362b9a | 5701 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
5702 | { |
5703 | int done = 0; | |
5704 | ||
5705 | if (the_low_target.siginfo_fixup != NULL) | |
5706 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
5707 | ||
5708 | /* If there was no callback, or the callback didn't do anything, | |
5709 | then just do a straight memcpy. */ | |
5710 | if (!done) | |
5711 | { | |
5712 | if (direction == 1) | |
a5362b9a | 5713 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5714 | else |
a5362b9a | 5715 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5716 | } |
5717 | } | |
5718 | ||
4aa995e1 PA |
5719 | static int |
5720 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5721 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5722 | { | |
d0722149 | 5723 | int pid; |
a5362b9a TS |
5724 | siginfo_t siginfo; |
5725 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 5726 | |
0bfdf32f | 5727 | if (current_thread == NULL) |
4aa995e1 PA |
5728 | return -1; |
5729 | ||
0bfdf32f | 5730 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
5731 | |
5732 | if (debug_threads) | |
87ce2a04 DE |
5733 | debug_printf ("%s siginfo for lwp %d.\n", |
5734 | readbuf != NULL ? "Reading" : "Writing", | |
5735 | pid); | |
4aa995e1 | 5736 | |
0adea5f7 | 5737 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5738 | return -1; |
5739 | ||
b8e1b30e | 5740 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5741 | return -1; |
5742 | ||
d0722149 DE |
5743 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5744 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5745 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5746 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5747 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5748 | ||
4aa995e1 PA |
5749 | if (offset + len > sizeof (siginfo)) |
5750 | len = sizeof (siginfo) - offset; | |
5751 | ||
5752 | if (readbuf != NULL) | |
d0722149 | 5753 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5754 | else |
5755 | { | |
d0722149 DE |
5756 | memcpy (inf_siginfo + offset, writebuf, len); |
5757 | ||
5758 | /* Convert back to ptrace layout before flushing it out. */ | |
5759 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5760 | ||
b8e1b30e | 5761 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5762 | return -1; |
5763 | } | |
5764 | ||
5765 | return len; | |
5766 | } | |
5767 | ||
bd99dc85 PA |
5768 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5769 | so we notice when children change state; as the handler for the | |
5770 | sigsuspend in my_waitpid. */ | |
5771 | ||
5772 | static void | |
5773 | sigchld_handler (int signo) | |
5774 | { | |
5775 | int old_errno = errno; | |
5776 | ||
5777 | if (debug_threads) | |
e581f2b4 PA |
5778 | { |
5779 | do | |
5780 | { | |
5781 | /* fprintf is not async-signal-safe, so call write | |
5782 | directly. */ | |
5783 | if (write (2, "sigchld_handler\n", | |
5784 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5785 | break; /* just ignore */ | |
5786 | } while (0); | |
5787 | } | |
bd99dc85 PA |
5788 | |
5789 | if (target_is_async_p ()) | |
5790 | async_file_mark (); /* trigger a linux_wait */ | |
5791 | ||
5792 | errno = old_errno; | |
5793 | } | |
5794 | ||
5795 | static int | |
5796 | linux_supports_non_stop (void) | |
5797 | { | |
5798 | return 1; | |
5799 | } | |
5800 | ||
5801 | static int | |
5802 | linux_async (int enable) | |
5803 | { | |
7089dca4 | 5804 | int previous = target_is_async_p (); |
bd99dc85 | 5805 | |
8336d594 | 5806 | if (debug_threads) |
87ce2a04 DE |
5807 | debug_printf ("linux_async (%d), previous=%d\n", |
5808 | enable, previous); | |
8336d594 | 5809 | |
bd99dc85 PA |
5810 | if (previous != enable) |
5811 | { | |
5812 | sigset_t mask; | |
5813 | sigemptyset (&mask); | |
5814 | sigaddset (&mask, SIGCHLD); | |
5815 | ||
5816 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5817 | ||
5818 | if (enable) | |
5819 | { | |
5820 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5821 | { |
5822 | linux_event_pipe[0] = -1; | |
5823 | linux_event_pipe[1] = -1; | |
5824 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5825 | ||
5826 | warning ("creating event pipe failed."); | |
5827 | return previous; | |
5828 | } | |
bd99dc85 PA |
5829 | |
5830 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5831 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5832 | ||
5833 | /* Register the event loop handler. */ | |
5834 | add_file_handler (linux_event_pipe[0], | |
5835 | handle_target_event, NULL); | |
5836 | ||
5837 | /* Always trigger a linux_wait. */ | |
5838 | async_file_mark (); | |
5839 | } | |
5840 | else | |
5841 | { | |
5842 | delete_file_handler (linux_event_pipe[0]); | |
5843 | ||
5844 | close (linux_event_pipe[0]); | |
5845 | close (linux_event_pipe[1]); | |
5846 | linux_event_pipe[0] = -1; | |
5847 | linux_event_pipe[1] = -1; | |
5848 | } | |
5849 | ||
5850 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5851 | } | |
5852 | ||
5853 | return previous; | |
5854 | } | |
5855 | ||
5856 | static int | |
5857 | linux_start_non_stop (int nonstop) | |
5858 | { | |
5859 | /* Register or unregister from event-loop accordingly. */ | |
5860 | linux_async (nonstop); | |
aa96c426 GB |
5861 | |
5862 | if (target_is_async_p () != (nonstop != 0)) | |
5863 | return -1; | |
5864 | ||
bd99dc85 PA |
5865 | return 0; |
5866 | } | |
5867 | ||
cf8fd78b PA |
5868 | static int |
5869 | linux_supports_multi_process (void) | |
5870 | { | |
5871 | return 1; | |
5872 | } | |
5873 | ||
89245bc0 DB |
5874 | /* Check if fork events are supported. */ |
5875 | ||
5876 | static int | |
5877 | linux_supports_fork_events (void) | |
5878 | { | |
5879 | return linux_supports_tracefork (); | |
5880 | } | |
5881 | ||
5882 | /* Check if vfork events are supported. */ | |
5883 | ||
5884 | static int | |
5885 | linux_supports_vfork_events (void) | |
5886 | { | |
5887 | return linux_supports_tracefork (); | |
5888 | } | |
5889 | ||
94585166 DB |
5890 | /* Check if exec events are supported. */ |
5891 | ||
5892 | static int | |
5893 | linux_supports_exec_events (void) | |
5894 | { | |
5895 | return linux_supports_traceexec (); | |
5896 | } | |
5897 | ||
de0d863e DB |
5898 | /* Callback for 'find_inferior'. Set the (possibly changed) ptrace |
5899 | options for the specified lwp. */ | |
5900 | ||
5901 | static int | |
5902 | reset_lwp_ptrace_options_callback (struct inferior_list_entry *entry, | |
5903 | void *args) | |
5904 | { | |
5905 | struct thread_info *thread = (struct thread_info *) entry; | |
5906 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5907 | ||
5908 | if (!lwp->stopped) | |
5909 | { | |
5910 | /* Stop the lwp so we can modify its ptrace options. */ | |
5911 | lwp->must_set_ptrace_flags = 1; | |
5912 | linux_stop_lwp (lwp); | |
5913 | } | |
5914 | else | |
5915 | { | |
5916 | /* Already stopped; go ahead and set the ptrace options. */ | |
5917 | struct process_info *proc = find_process_pid (pid_of (thread)); | |
5918 | int options = linux_low_ptrace_options (proc->attached); | |
5919 | ||
5920 | linux_enable_event_reporting (lwpid_of (thread), options); | |
5921 | lwp->must_set_ptrace_flags = 0; | |
5922 | } | |
5923 | ||
5924 | return 0; | |
5925 | } | |
5926 | ||
5927 | /* Target hook for 'handle_new_gdb_connection'. Causes a reset of the | |
5928 | ptrace flags for all inferiors. This is in case the new GDB connection | |
5929 | doesn't support the same set of events that the previous one did. */ | |
5930 | ||
5931 | static void | |
5932 | linux_handle_new_gdb_connection (void) | |
5933 | { | |
5934 | pid_t pid; | |
5935 | ||
5936 | /* Request that all the lwps reset their ptrace options. */ | |
5937 | find_inferior (&all_threads, reset_lwp_ptrace_options_callback , &pid); | |
5938 | } | |
5939 | ||
03583c20 UW |
5940 | static int |
5941 | linux_supports_disable_randomization (void) | |
5942 | { | |
5943 | #ifdef HAVE_PERSONALITY | |
5944 | return 1; | |
5945 | #else | |
5946 | return 0; | |
5947 | #endif | |
5948 | } | |
efcbbd14 | 5949 | |
d1feda86 YQ |
5950 | static int |
5951 | linux_supports_agent (void) | |
5952 | { | |
5953 | return 1; | |
5954 | } | |
5955 | ||
c2d6af84 PA |
5956 | static int |
5957 | linux_supports_range_stepping (void) | |
5958 | { | |
5959 | if (*the_low_target.supports_range_stepping == NULL) | |
5960 | return 0; | |
5961 | ||
5962 | return (*the_low_target.supports_range_stepping) (); | |
5963 | } | |
5964 | ||
efcbbd14 UW |
5965 | /* Enumerate spufs IDs for process PID. */ |
5966 | static int | |
5967 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5968 | { | |
5969 | int pos = 0; | |
5970 | int written = 0; | |
5971 | char path[128]; | |
5972 | DIR *dir; | |
5973 | struct dirent *entry; | |
5974 | ||
5975 | sprintf (path, "/proc/%ld/fd", pid); | |
5976 | dir = opendir (path); | |
5977 | if (!dir) | |
5978 | return -1; | |
5979 | ||
5980 | rewinddir (dir); | |
5981 | while ((entry = readdir (dir)) != NULL) | |
5982 | { | |
5983 | struct stat st; | |
5984 | struct statfs stfs; | |
5985 | int fd; | |
5986 | ||
5987 | fd = atoi (entry->d_name); | |
5988 | if (!fd) | |
5989 | continue; | |
5990 | ||
5991 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5992 | if (stat (path, &st) != 0) | |
5993 | continue; | |
5994 | if (!S_ISDIR (st.st_mode)) | |
5995 | continue; | |
5996 | ||
5997 | if (statfs (path, &stfs) != 0) | |
5998 | continue; | |
5999 | if (stfs.f_type != SPUFS_MAGIC) | |
6000 | continue; | |
6001 | ||
6002 | if (pos >= offset && pos + 4 <= offset + len) | |
6003 | { | |
6004 | *(unsigned int *)(buf + pos - offset) = fd; | |
6005 | written += 4; | |
6006 | } | |
6007 | pos += 4; | |
6008 | } | |
6009 | ||
6010 | closedir (dir); | |
6011 | return written; | |
6012 | } | |
6013 | ||
6014 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
6015 | object type, using the /proc file system. */ | |
6016 | static int | |
6017 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
6018 | unsigned const char *writebuf, | |
6019 | CORE_ADDR offset, int len) | |
6020 | { | |
0bfdf32f | 6021 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
6022 | char buf[128]; |
6023 | int fd = 0; | |
6024 | int ret = 0; | |
6025 | ||
6026 | if (!writebuf && !readbuf) | |
6027 | return -1; | |
6028 | ||
6029 | if (!*annex) | |
6030 | { | |
6031 | if (!readbuf) | |
6032 | return -1; | |
6033 | else | |
6034 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
6035 | } | |
6036 | ||
6037 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
6038 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
6039 | if (fd <= 0) | |
6040 | return -1; | |
6041 | ||
6042 | if (offset != 0 | |
6043 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
6044 | { | |
6045 | close (fd); | |
6046 | return 0; | |
6047 | } | |
6048 | ||
6049 | if (writebuf) | |
6050 | ret = write (fd, writebuf, (size_t) len); | |
6051 | else | |
6052 | ret = read (fd, readbuf, (size_t) len); | |
6053 | ||
6054 | close (fd); | |
6055 | return ret; | |
6056 | } | |
6057 | ||
723b724b | 6058 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
6059 | struct target_loadseg |
6060 | { | |
6061 | /* Core address to which the segment is mapped. */ | |
6062 | Elf32_Addr addr; | |
6063 | /* VMA recorded in the program header. */ | |
6064 | Elf32_Addr p_vaddr; | |
6065 | /* Size of this segment in memory. */ | |
6066 | Elf32_Word p_memsz; | |
6067 | }; | |
6068 | ||
723b724b | 6069 | # if defined PT_GETDSBT |
78d85199 YQ |
6070 | struct target_loadmap |
6071 | { | |
6072 | /* Protocol version number, must be zero. */ | |
6073 | Elf32_Word version; | |
6074 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
6075 | unsigned *dsbt_table; | |
6076 | unsigned dsbt_size, dsbt_index; | |
6077 | /* Number of segments in this map. */ | |
6078 | Elf32_Word nsegs; | |
6079 | /* The actual memory map. */ | |
6080 | struct target_loadseg segs[/*nsegs*/]; | |
6081 | }; | |
723b724b MF |
6082 | # define LINUX_LOADMAP PT_GETDSBT |
6083 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
6084 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
6085 | # else | |
6086 | struct target_loadmap | |
6087 | { | |
6088 | /* Protocol version number, must be zero. */ | |
6089 | Elf32_Half version; | |
6090 | /* Number of segments in this map. */ | |
6091 | Elf32_Half nsegs; | |
6092 | /* The actual memory map. */ | |
6093 | struct target_loadseg segs[/*nsegs*/]; | |
6094 | }; | |
6095 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
6096 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
6097 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
6098 | # endif | |
78d85199 | 6099 | |
78d85199 YQ |
6100 | static int |
6101 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
6102 | unsigned char *myaddr, unsigned int len) | |
6103 | { | |
0bfdf32f | 6104 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
6105 | int addr = -1; |
6106 | struct target_loadmap *data = NULL; | |
6107 | unsigned int actual_length, copy_length; | |
6108 | ||
6109 | if (strcmp (annex, "exec") == 0) | |
723b724b | 6110 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 6111 | else if (strcmp (annex, "interp") == 0) |
723b724b | 6112 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
6113 | else |
6114 | return -1; | |
6115 | ||
723b724b | 6116 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
6117 | return -1; |
6118 | ||
6119 | if (data == NULL) | |
6120 | return -1; | |
6121 | ||
6122 | actual_length = sizeof (struct target_loadmap) | |
6123 | + sizeof (struct target_loadseg) * data->nsegs; | |
6124 | ||
6125 | if (offset < 0 || offset > actual_length) | |
6126 | return -1; | |
6127 | ||
6128 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
6129 | memcpy (myaddr, (char *) data + offset, copy_length); | |
6130 | return copy_length; | |
6131 | } | |
723b724b MF |
6132 | #else |
6133 | # define linux_read_loadmap NULL | |
6134 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 6135 | |
1570b33e L |
6136 | static void |
6137 | linux_process_qsupported (const char *query) | |
6138 | { | |
6139 | if (the_low_target.process_qsupported != NULL) | |
6140 | the_low_target.process_qsupported (query); | |
6141 | } | |
6142 | ||
219f2f23 PA |
6143 | static int |
6144 | linux_supports_tracepoints (void) | |
6145 | { | |
6146 | if (*the_low_target.supports_tracepoints == NULL) | |
6147 | return 0; | |
6148 | ||
6149 | return (*the_low_target.supports_tracepoints) (); | |
6150 | } | |
6151 | ||
6152 | static CORE_ADDR | |
6153 | linux_read_pc (struct regcache *regcache) | |
6154 | { | |
6155 | if (the_low_target.get_pc == NULL) | |
6156 | return 0; | |
6157 | ||
6158 | return (*the_low_target.get_pc) (regcache); | |
6159 | } | |
6160 | ||
6161 | static void | |
6162 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
6163 | { | |
6164 | gdb_assert (the_low_target.set_pc != NULL); | |
6165 | ||
6166 | (*the_low_target.set_pc) (regcache, pc); | |
6167 | } | |
6168 | ||
8336d594 PA |
6169 | static int |
6170 | linux_thread_stopped (struct thread_info *thread) | |
6171 | { | |
6172 | return get_thread_lwp (thread)->stopped; | |
6173 | } | |
6174 | ||
6175 | /* This exposes stop-all-threads functionality to other modules. */ | |
6176 | ||
6177 | static void | |
7984d532 | 6178 | linux_pause_all (int freeze) |
8336d594 | 6179 | { |
7984d532 PA |
6180 | stop_all_lwps (freeze, NULL); |
6181 | } | |
6182 | ||
6183 | /* This exposes unstop-all-threads functionality to other gdbserver | |
6184 | modules. */ | |
6185 | ||
6186 | static void | |
6187 | linux_unpause_all (int unfreeze) | |
6188 | { | |
6189 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
6190 | } |
6191 | ||
90d74c30 PA |
6192 | static int |
6193 | linux_prepare_to_access_memory (void) | |
6194 | { | |
6195 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6196 | running LWP. */ | |
6197 | if (non_stop) | |
6198 | linux_pause_all (1); | |
6199 | return 0; | |
6200 | } | |
6201 | ||
6202 | static void | |
0146f85b | 6203 | linux_done_accessing_memory (void) |
90d74c30 PA |
6204 | { |
6205 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
6206 | running LWP. */ | |
6207 | if (non_stop) | |
6208 | linux_unpause_all (1); | |
6209 | } | |
6210 | ||
fa593d66 PA |
6211 | static int |
6212 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
6213 | CORE_ADDR collector, | |
6214 | CORE_ADDR lockaddr, | |
6215 | ULONGEST orig_size, | |
6216 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
6217 | CORE_ADDR *trampoline, |
6218 | ULONGEST *trampoline_size, | |
fa593d66 PA |
6219 | unsigned char *jjump_pad_insn, |
6220 | ULONGEST *jjump_pad_insn_size, | |
6221 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
6222 | CORE_ADDR *adjusted_insn_addr_end, |
6223 | char *err) | |
fa593d66 PA |
6224 | { |
6225 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
6226 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
6227 | jump_entry, trampoline, trampoline_size, |
6228 | jjump_pad_insn, jjump_pad_insn_size, | |
6229 | adjusted_insn_addr, adjusted_insn_addr_end, | |
6230 | err); | |
fa593d66 PA |
6231 | } |
6232 | ||
6a271cae PA |
6233 | static struct emit_ops * |
6234 | linux_emit_ops (void) | |
6235 | { | |
6236 | if (the_low_target.emit_ops != NULL) | |
6237 | return (*the_low_target.emit_ops) (); | |
6238 | else | |
6239 | return NULL; | |
6240 | } | |
6241 | ||
405f8e94 SS |
6242 | static int |
6243 | linux_get_min_fast_tracepoint_insn_len (void) | |
6244 | { | |
6245 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
6246 | } | |
6247 | ||
2268b414 JK |
6248 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
6249 | ||
6250 | static int | |
6251 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
6252 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
6253 | { | |
6254 | char filename[PATH_MAX]; | |
6255 | int fd; | |
6256 | const int auxv_size = is_elf64 | |
6257 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
6258 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
6259 | ||
6260 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
6261 | ||
6262 | fd = open (filename, O_RDONLY); | |
6263 | if (fd < 0) | |
6264 | return 1; | |
6265 | ||
6266 | *phdr_memaddr = 0; | |
6267 | *num_phdr = 0; | |
6268 | while (read (fd, buf, auxv_size) == auxv_size | |
6269 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
6270 | { | |
6271 | if (is_elf64) | |
6272 | { | |
6273 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
6274 | ||
6275 | switch (aux->a_type) | |
6276 | { | |
6277 | case AT_PHDR: | |
6278 | *phdr_memaddr = aux->a_un.a_val; | |
6279 | break; | |
6280 | case AT_PHNUM: | |
6281 | *num_phdr = aux->a_un.a_val; | |
6282 | break; | |
6283 | } | |
6284 | } | |
6285 | else | |
6286 | { | |
6287 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
6288 | ||
6289 | switch (aux->a_type) | |
6290 | { | |
6291 | case AT_PHDR: | |
6292 | *phdr_memaddr = aux->a_un.a_val; | |
6293 | break; | |
6294 | case AT_PHNUM: | |
6295 | *num_phdr = aux->a_un.a_val; | |
6296 | break; | |
6297 | } | |
6298 | } | |
6299 | } | |
6300 | ||
6301 | close (fd); | |
6302 | ||
6303 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
6304 | { | |
6305 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
6306 | "phdr_memaddr = %ld, phdr_num = %d", | |
6307 | (long) *phdr_memaddr, *num_phdr); | |
6308 | return 2; | |
6309 | } | |
6310 | ||
6311 | return 0; | |
6312 | } | |
6313 | ||
6314 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
6315 | ||
6316 | static CORE_ADDR | |
6317 | get_dynamic (const int pid, const int is_elf64) | |
6318 | { | |
6319 | CORE_ADDR phdr_memaddr, relocation; | |
db1ff28b | 6320 | int num_phdr, i; |
2268b414 | 6321 | unsigned char *phdr_buf; |
db1ff28b | 6322 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); |
2268b414 JK |
6323 | |
6324 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
6325 | return 0; | |
6326 | ||
6327 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
224c3ddb | 6328 | phdr_buf = (unsigned char *) alloca (num_phdr * phdr_size); |
2268b414 JK |
6329 | |
6330 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
6331 | return 0; | |
6332 | ||
6333 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
6334 | non-zero for PIE ones. */ | |
6335 | relocation = -1; | |
db1ff28b JK |
6336 | for (i = 0; relocation == -1 && i < num_phdr; i++) |
6337 | if (is_elf64) | |
6338 | { | |
6339 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6340 | ||
6341 | if (p->p_type == PT_PHDR) | |
6342 | relocation = phdr_memaddr - p->p_vaddr; | |
6343 | } | |
6344 | else | |
6345 | { | |
6346 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
6347 | ||
6348 | if (p->p_type == PT_PHDR) | |
6349 | relocation = phdr_memaddr - p->p_vaddr; | |
6350 | } | |
6351 | ||
2268b414 JK |
6352 | if (relocation == -1) |
6353 | { | |
e237a7e2 JK |
6354 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
6355 | any real world executables, including PIE executables, have always | |
6356 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
6357 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
6358 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
6359 | ||
6360 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
6361 | ||
6362 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
6363 | ||
2268b414 JK |
6364 | return 0; |
6365 | } | |
6366 | ||
db1ff28b JK |
6367 | for (i = 0; i < num_phdr; i++) |
6368 | { | |
6369 | if (is_elf64) | |
6370 | { | |
6371 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
6372 | ||
6373 | if (p->p_type == PT_DYNAMIC) | |
6374 | return p->p_vaddr + relocation; | |
6375 | } | |
6376 | else | |
6377 | { | |
6378 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
2268b414 | 6379 | |
db1ff28b JK |
6380 | if (p->p_type == PT_DYNAMIC) |
6381 | return p->p_vaddr + relocation; | |
6382 | } | |
6383 | } | |
2268b414 JK |
6384 | |
6385 | return 0; | |
6386 | } | |
6387 | ||
6388 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
6389 | can be 0 if the inferior does not yet have the library list initialized. |
6390 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
6391 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
6392 | |
6393 | static CORE_ADDR | |
6394 | get_r_debug (const int pid, const int is_elf64) | |
6395 | { | |
6396 | CORE_ADDR dynamic_memaddr; | |
6397 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
6398 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 6399 | CORE_ADDR map = -1; |
2268b414 JK |
6400 | |
6401 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
6402 | if (dynamic_memaddr == 0) | |
367ba2c2 | 6403 | return map; |
2268b414 JK |
6404 | |
6405 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
6406 | { | |
6407 | if (is_elf64) | |
6408 | { | |
6409 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
a738da3a | 6410 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6411 | union |
6412 | { | |
6413 | Elf64_Xword map; | |
6414 | unsigned char buf[sizeof (Elf64_Xword)]; | |
6415 | } | |
6416 | rld_map; | |
a738da3a MF |
6417 | #endif |
6418 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6419 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6420 | { | |
6421 | if (linux_read_memory (dyn->d_un.d_val, | |
6422 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6423 | return rld_map.map; | |
6424 | else | |
6425 | break; | |
6426 | } | |
75f62ce7 | 6427 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6428 | #ifdef DT_MIPS_RLD_MAP_REL |
6429 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6430 | { | |
6431 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6432 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6433 | return rld_map.map; | |
6434 | else | |
6435 | break; | |
6436 | } | |
6437 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6438 | |
367ba2c2 MR |
6439 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6440 | map = dyn->d_un.d_val; | |
2268b414 JK |
6441 | |
6442 | if (dyn->d_tag == DT_NULL) | |
6443 | break; | |
6444 | } | |
6445 | else | |
6446 | { | |
6447 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
a738da3a | 6448 | #if defined DT_MIPS_RLD_MAP || defined DT_MIPS_RLD_MAP_REL |
367ba2c2 MR |
6449 | union |
6450 | { | |
6451 | Elf32_Word map; | |
6452 | unsigned char buf[sizeof (Elf32_Word)]; | |
6453 | } | |
6454 | rld_map; | |
a738da3a MF |
6455 | #endif |
6456 | #ifdef DT_MIPS_RLD_MAP | |
367ba2c2 MR |
6457 | if (dyn->d_tag == DT_MIPS_RLD_MAP) |
6458 | { | |
6459 | if (linux_read_memory (dyn->d_un.d_val, | |
6460 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6461 | return rld_map.map; | |
6462 | else | |
6463 | break; | |
6464 | } | |
75f62ce7 | 6465 | #endif /* DT_MIPS_RLD_MAP */ |
a738da3a MF |
6466 | #ifdef DT_MIPS_RLD_MAP_REL |
6467 | if (dyn->d_tag == DT_MIPS_RLD_MAP_REL) | |
6468 | { | |
6469 | if (linux_read_memory (dyn->d_un.d_val + dynamic_memaddr, | |
6470 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
6471 | return rld_map.map; | |
6472 | else | |
6473 | break; | |
6474 | } | |
6475 | #endif /* DT_MIPS_RLD_MAP_REL */ | |
2268b414 | 6476 | |
367ba2c2 MR |
6477 | if (dyn->d_tag == DT_DEBUG && map == -1) |
6478 | map = dyn->d_un.d_val; | |
2268b414 JK |
6479 | |
6480 | if (dyn->d_tag == DT_NULL) | |
6481 | break; | |
6482 | } | |
6483 | ||
6484 | dynamic_memaddr += dyn_size; | |
6485 | } | |
6486 | ||
367ba2c2 | 6487 | return map; |
2268b414 JK |
6488 | } |
6489 | ||
6490 | /* Read one pointer from MEMADDR in the inferior. */ | |
6491 | ||
6492 | static int | |
6493 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
6494 | { | |
485f1ee4 PA |
6495 | int ret; |
6496 | ||
6497 | /* Go through a union so this works on either big or little endian | |
6498 | hosts, when the inferior's pointer size is smaller than the size | |
6499 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
6500 | same of the superior's. */ | |
6501 | union | |
6502 | { | |
6503 | CORE_ADDR core_addr; | |
6504 | unsigned int ui; | |
6505 | unsigned char uc; | |
6506 | } addr; | |
6507 | ||
6508 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
6509 | if (ret == 0) | |
6510 | { | |
6511 | if (ptr_size == sizeof (CORE_ADDR)) | |
6512 | *ptr = addr.core_addr; | |
6513 | else if (ptr_size == sizeof (unsigned int)) | |
6514 | *ptr = addr.ui; | |
6515 | else | |
6516 | gdb_assert_not_reached ("unhandled pointer size"); | |
6517 | } | |
6518 | return ret; | |
2268b414 JK |
6519 | } |
6520 | ||
6521 | struct link_map_offsets | |
6522 | { | |
6523 | /* Offset and size of r_debug.r_version. */ | |
6524 | int r_version_offset; | |
6525 | ||
6526 | /* Offset and size of r_debug.r_map. */ | |
6527 | int r_map_offset; | |
6528 | ||
6529 | /* Offset to l_addr field in struct link_map. */ | |
6530 | int l_addr_offset; | |
6531 | ||
6532 | /* Offset to l_name field in struct link_map. */ | |
6533 | int l_name_offset; | |
6534 | ||
6535 | /* Offset to l_ld field in struct link_map. */ | |
6536 | int l_ld_offset; | |
6537 | ||
6538 | /* Offset to l_next field in struct link_map. */ | |
6539 | int l_next_offset; | |
6540 | ||
6541 | /* Offset to l_prev field in struct link_map. */ | |
6542 | int l_prev_offset; | |
6543 | }; | |
6544 | ||
fb723180 | 6545 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
6546 | |
6547 | static int | |
6548 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
6549 | unsigned const char *writebuf, | |
6550 | CORE_ADDR offset, int len) | |
6551 | { | |
6552 | char *document; | |
6553 | unsigned document_len; | |
fe978cb0 | 6554 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
6555 | char filename[PATH_MAX]; |
6556 | int pid, is_elf64; | |
6557 | ||
6558 | static const struct link_map_offsets lmo_32bit_offsets = | |
6559 | { | |
6560 | 0, /* r_version offset. */ | |
6561 | 4, /* r_debug.r_map offset. */ | |
6562 | 0, /* l_addr offset in link_map. */ | |
6563 | 4, /* l_name offset in link_map. */ | |
6564 | 8, /* l_ld offset in link_map. */ | |
6565 | 12, /* l_next offset in link_map. */ | |
6566 | 16 /* l_prev offset in link_map. */ | |
6567 | }; | |
6568 | ||
6569 | static const struct link_map_offsets lmo_64bit_offsets = | |
6570 | { | |
6571 | 0, /* r_version offset. */ | |
6572 | 8, /* r_debug.r_map offset. */ | |
6573 | 0, /* l_addr offset in link_map. */ | |
6574 | 8, /* l_name offset in link_map. */ | |
6575 | 16, /* l_ld offset in link_map. */ | |
6576 | 24, /* l_next offset in link_map. */ | |
6577 | 32 /* l_prev offset in link_map. */ | |
6578 | }; | |
6579 | const struct link_map_offsets *lmo; | |
214d508e | 6580 | unsigned int machine; |
b1fbec62 GB |
6581 | int ptr_size; |
6582 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
6583 | int allocated = 1024; | |
6584 | char *p; | |
6585 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
6586 | int header_done = 0; | |
2268b414 JK |
6587 | |
6588 | if (writebuf != NULL) | |
6589 | return -2; | |
6590 | if (readbuf == NULL) | |
6591 | return -1; | |
6592 | ||
0bfdf32f | 6593 | pid = lwpid_of (current_thread); |
2268b414 | 6594 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 6595 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 6596 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 6597 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 6598 | |
b1fbec62 GB |
6599 | while (annex[0] != '\0') |
6600 | { | |
6601 | const char *sep; | |
6602 | CORE_ADDR *addrp; | |
6603 | int len; | |
2268b414 | 6604 | |
b1fbec62 GB |
6605 | sep = strchr (annex, '='); |
6606 | if (sep == NULL) | |
6607 | break; | |
0c5bf5a9 | 6608 | |
b1fbec62 | 6609 | len = sep - annex; |
61012eef | 6610 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 6611 | addrp = &lm_addr; |
61012eef | 6612 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
6613 | addrp = &lm_prev; |
6614 | else | |
6615 | { | |
6616 | annex = strchr (sep, ';'); | |
6617 | if (annex == NULL) | |
6618 | break; | |
6619 | annex++; | |
6620 | continue; | |
6621 | } | |
6622 | ||
6623 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 6624 | } |
b1fbec62 GB |
6625 | |
6626 | if (lm_addr == 0) | |
2268b414 | 6627 | { |
b1fbec62 GB |
6628 | int r_version = 0; |
6629 | ||
6630 | if (priv->r_debug == 0) | |
6631 | priv->r_debug = get_r_debug (pid, is_elf64); | |
6632 | ||
6633 | /* We failed to find DT_DEBUG. Such situation will not change | |
6634 | for this inferior - do not retry it. Report it to GDB as | |
6635 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
6636 | if (priv->r_debug == (CORE_ADDR) -1) | |
6637 | return -1; | |
6638 | ||
6639 | if (priv->r_debug != 0) | |
2268b414 | 6640 | { |
b1fbec62 GB |
6641 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
6642 | (unsigned char *) &r_version, | |
6643 | sizeof (r_version)) != 0 | |
6644 | || r_version != 1) | |
6645 | { | |
6646 | warning ("unexpected r_debug version %d", r_version); | |
6647 | } | |
6648 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
6649 | &lm_addr, ptr_size) != 0) | |
6650 | { | |
6651 | warning ("unable to read r_map from 0x%lx", | |
6652 | (long) priv->r_debug + lmo->r_map_offset); | |
6653 | } | |
2268b414 | 6654 | } |
b1fbec62 | 6655 | } |
2268b414 | 6656 | |
224c3ddb | 6657 | document = (char *) xmalloc (allocated); |
b1fbec62 GB |
6658 | strcpy (document, "<library-list-svr4 version=\"1.0\""); |
6659 | p = document + strlen (document); | |
6660 | ||
6661 | while (lm_addr | |
6662 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6663 | &l_name, ptr_size) == 0 | |
6664 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6665 | &l_addr, ptr_size) == 0 | |
6666 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6667 | &l_ld, ptr_size) == 0 | |
6668 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6669 | &l_prev, ptr_size) == 0 | |
6670 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6671 | &l_next, ptr_size) == 0) | |
6672 | { | |
6673 | unsigned char libname[PATH_MAX]; | |
6674 | ||
6675 | if (lm_prev != l_prev) | |
2268b414 | 6676 | { |
b1fbec62 GB |
6677 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6678 | (long) lm_prev, (long) l_prev); | |
6679 | break; | |
2268b414 JK |
6680 | } |
6681 | ||
d878444c JK |
6682 | /* Ignore the first entry even if it has valid name as the first entry |
6683 | corresponds to the main executable. The first entry should not be | |
6684 | skipped if the dynamic loader was loaded late by a static executable | |
6685 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6686 | executable does not have PT_DYNAMIC present and this function already | |
6687 | exited above due to failed get_r_debug. */ | |
6688 | if (lm_prev == 0) | |
2268b414 | 6689 | { |
d878444c JK |
6690 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
6691 | p = p + strlen (p); | |
6692 | } | |
6693 | else | |
6694 | { | |
6695 | /* Not checking for error because reading may stop before | |
6696 | we've got PATH_MAX worth of characters. */ | |
6697 | libname[0] = '\0'; | |
6698 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6699 | libname[sizeof (libname) - 1] = '\0'; | |
6700 | if (libname[0] != '\0') | |
2268b414 | 6701 | { |
d878444c JK |
6702 | /* 6x the size for xml_escape_text below. */ |
6703 | size_t len = 6 * strlen ((char *) libname); | |
6704 | char *name; | |
2268b414 | 6705 | |
d878444c JK |
6706 | if (!header_done) |
6707 | { | |
6708 | /* Terminate `<library-list-svr4'. */ | |
6709 | *p++ = '>'; | |
6710 | header_done = 1; | |
6711 | } | |
2268b414 | 6712 | |
db1ff28b | 6713 | while (allocated < p - document + len + 200) |
d878444c JK |
6714 | { |
6715 | /* Expand to guarantee sufficient storage. */ | |
6716 | uintptr_t document_len = p - document; | |
2268b414 | 6717 | |
224c3ddb | 6718 | document = (char *) xrealloc (document, 2 * allocated); |
d878444c JK |
6719 | allocated *= 2; |
6720 | p = document + document_len; | |
6721 | } | |
6722 | ||
6723 | name = xml_escape_text ((char *) libname); | |
6724 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
db1ff28b | 6725 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", |
d878444c JK |
6726 | name, (unsigned long) lm_addr, |
6727 | (unsigned long) l_addr, (unsigned long) l_ld); | |
6728 | free (name); | |
6729 | } | |
0afae3cf | 6730 | } |
b1fbec62 GB |
6731 | |
6732 | lm_prev = lm_addr; | |
6733 | lm_addr = l_next; | |
2268b414 JK |
6734 | } |
6735 | ||
b1fbec62 GB |
6736 | if (!header_done) |
6737 | { | |
6738 | /* Empty list; terminate `<library-list-svr4'. */ | |
6739 | strcpy (p, "/>"); | |
6740 | } | |
6741 | else | |
6742 | strcpy (p, "</library-list-svr4>"); | |
6743 | ||
2268b414 JK |
6744 | document_len = strlen (document); |
6745 | if (offset < document_len) | |
6746 | document_len -= offset; | |
6747 | else | |
6748 | document_len = 0; | |
6749 | if (len > document_len) | |
6750 | len = document_len; | |
6751 | ||
6752 | memcpy (readbuf, document + offset, len); | |
6753 | xfree (document); | |
6754 | ||
6755 | return len; | |
6756 | } | |
6757 | ||
9accd112 MM |
6758 | #ifdef HAVE_LINUX_BTRACE |
6759 | ||
969c39fb | 6760 | /* See to_disable_btrace target method. */ |
9accd112 | 6761 | |
969c39fb MM |
6762 | static int |
6763 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
6764 | { | |
6765 | enum btrace_error err; | |
6766 | ||
6767 | err = linux_disable_btrace (tinfo); | |
6768 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6769 | } | |
6770 | ||
b20a6524 MM |
6771 | /* Encode an Intel(R) Processor Trace configuration. */ |
6772 | ||
6773 | static void | |
6774 | linux_low_encode_pt_config (struct buffer *buffer, | |
6775 | const struct btrace_data_pt_config *config) | |
6776 | { | |
6777 | buffer_grow_str (buffer, "<pt-config>\n"); | |
6778 | ||
6779 | switch (config->cpu.vendor) | |
6780 | { | |
6781 | case CV_INTEL: | |
6782 | buffer_xml_printf (buffer, "<cpu vendor=\"GenuineIntel\" family=\"%u\" " | |
6783 | "model=\"%u\" stepping=\"%u\"/>\n", | |
6784 | config->cpu.family, config->cpu.model, | |
6785 | config->cpu.stepping); | |
6786 | break; | |
6787 | ||
6788 | default: | |
6789 | break; | |
6790 | } | |
6791 | ||
6792 | buffer_grow_str (buffer, "</pt-config>\n"); | |
6793 | } | |
6794 | ||
6795 | /* Encode a raw buffer. */ | |
6796 | ||
6797 | static void | |
6798 | linux_low_encode_raw (struct buffer *buffer, const gdb_byte *data, | |
6799 | unsigned int size) | |
6800 | { | |
6801 | if (size == 0) | |
6802 | return; | |
6803 | ||
6804 | /* We use hex encoding - see common/rsp-low.h. */ | |
6805 | buffer_grow_str (buffer, "<raw>\n"); | |
6806 | ||
6807 | while (size-- > 0) | |
6808 | { | |
6809 | char elem[2]; | |
6810 | ||
6811 | elem[0] = tohex ((*data >> 4) & 0xf); | |
6812 | elem[1] = tohex (*data++ & 0xf); | |
6813 | ||
6814 | buffer_grow (buffer, elem, 2); | |
6815 | } | |
6816 | ||
6817 | buffer_grow_str (buffer, "</raw>\n"); | |
6818 | } | |
6819 | ||
969c39fb MM |
6820 | /* See to_read_btrace target method. */ |
6821 | ||
6822 | static int | |
9accd112 MM |
6823 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
6824 | int type) | |
6825 | { | |
734b0e4b | 6826 | struct btrace_data btrace; |
9accd112 | 6827 | struct btrace_block *block; |
969c39fb | 6828 | enum btrace_error err; |
9accd112 MM |
6829 | int i; |
6830 | ||
734b0e4b MM |
6831 | btrace_data_init (&btrace); |
6832 | ||
969c39fb MM |
6833 | err = linux_read_btrace (&btrace, tinfo, type); |
6834 | if (err != BTRACE_ERR_NONE) | |
6835 | { | |
6836 | if (err == BTRACE_ERR_OVERFLOW) | |
6837 | buffer_grow_str0 (buffer, "E.Overflow."); | |
6838 | else | |
6839 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
6840 | ||
b20a6524 | 6841 | goto err; |
969c39fb | 6842 | } |
9accd112 | 6843 | |
734b0e4b MM |
6844 | switch (btrace.format) |
6845 | { | |
6846 | case BTRACE_FORMAT_NONE: | |
6847 | buffer_grow_str0 (buffer, "E.No Trace."); | |
b20a6524 | 6848 | goto err; |
734b0e4b MM |
6849 | |
6850 | case BTRACE_FORMAT_BTS: | |
6851 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6852 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 6853 | |
734b0e4b MM |
6854 | for (i = 0; |
6855 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
6856 | i++) | |
6857 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
6858 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 6859 | |
734b0e4b MM |
6860 | buffer_grow_str0 (buffer, "</btrace>\n"); |
6861 | break; | |
6862 | ||
b20a6524 MM |
6863 | case BTRACE_FORMAT_PT: |
6864 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6865 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
6866 | buffer_grow_str (buffer, "<pt>\n"); | |
6867 | ||
6868 | linux_low_encode_pt_config (buffer, &btrace.variant.pt.config); | |
9accd112 | 6869 | |
b20a6524 MM |
6870 | linux_low_encode_raw (buffer, btrace.variant.pt.data, |
6871 | btrace.variant.pt.size); | |
6872 | ||
6873 | buffer_grow_str (buffer, "</pt>\n"); | |
6874 | buffer_grow_str0 (buffer, "</btrace>\n"); | |
6875 | break; | |
6876 | ||
6877 | default: | |
6878 | buffer_grow_str0 (buffer, "E.Unsupported Trace Format."); | |
6879 | goto err; | |
734b0e4b | 6880 | } |
969c39fb | 6881 | |
734b0e4b | 6882 | btrace_data_fini (&btrace); |
969c39fb | 6883 | return 0; |
b20a6524 MM |
6884 | |
6885 | err: | |
6886 | btrace_data_fini (&btrace); | |
6887 | return -1; | |
9accd112 | 6888 | } |
f4abbc16 MM |
6889 | |
6890 | /* See to_btrace_conf target method. */ | |
6891 | ||
6892 | static int | |
6893 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
6894 | struct buffer *buffer) | |
6895 | { | |
6896 | const struct btrace_config *conf; | |
6897 | ||
6898 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
6899 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
6900 | ||
6901 | conf = linux_btrace_conf (tinfo); | |
6902 | if (conf != NULL) | |
6903 | { | |
6904 | switch (conf->format) | |
6905 | { | |
6906 | case BTRACE_FORMAT_NONE: | |
6907 | break; | |
6908 | ||
6909 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
6910 | buffer_xml_printf (buffer, "<bts"); |
6911 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
6912 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 | 6913 | break; |
b20a6524 MM |
6914 | |
6915 | case BTRACE_FORMAT_PT: | |
6916 | buffer_xml_printf (buffer, "<pt"); | |
6917 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->pt.size); | |
6918 | buffer_xml_printf (buffer, "/>\n"); | |
6919 | break; | |
f4abbc16 MM |
6920 | } |
6921 | } | |
6922 | ||
6923 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
6924 | return 0; | |
6925 | } | |
9accd112 MM |
6926 | #endif /* HAVE_LINUX_BTRACE */ |
6927 | ||
7b669087 GB |
6928 | /* See nat/linux-nat.h. */ |
6929 | ||
6930 | ptid_t | |
6931 | current_lwp_ptid (void) | |
6932 | { | |
6933 | return ptid_of (current_thread); | |
6934 | } | |
6935 | ||
dd373349 AT |
6936 | /* Implementation of the target_ops method "breakpoint_kind_from_pc". */ |
6937 | ||
6938 | static int | |
6939 | linux_breakpoint_kind_from_pc (CORE_ADDR *pcptr) | |
6940 | { | |
6941 | if (the_low_target.breakpoint_kind_from_pc != NULL) | |
6942 | return (*the_low_target.breakpoint_kind_from_pc) (pcptr); | |
6943 | else | |
1652a986 | 6944 | return default_breakpoint_kind_from_pc (pcptr); |
dd373349 AT |
6945 | } |
6946 | ||
6947 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ | |
6948 | ||
6949 | static const gdb_byte * | |
6950 | linux_sw_breakpoint_from_kind (int kind, int *size) | |
6951 | { | |
6952 | gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL); | |
6953 | ||
6954 | return (*the_low_target.sw_breakpoint_from_kind) (kind, size); | |
6955 | } | |
6956 | ||
ce3a066d DJ |
6957 | static struct target_ops linux_target_ops = { |
6958 | linux_create_inferior, | |
c06cbd92 | 6959 | linux_arch_setup, |
ce3a066d DJ |
6960 | linux_attach, |
6961 | linux_kill, | |
6ad8ae5c | 6962 | linux_detach, |
8336d594 | 6963 | linux_mourn, |
444d6139 | 6964 | linux_join, |
ce3a066d DJ |
6965 | linux_thread_alive, |
6966 | linux_resume, | |
6967 | linux_wait, | |
6968 | linux_fetch_registers, | |
6969 | linux_store_registers, | |
90d74c30 | 6970 | linux_prepare_to_access_memory, |
0146f85b | 6971 | linux_done_accessing_memory, |
ce3a066d DJ |
6972 | linux_read_memory, |
6973 | linux_write_memory, | |
2f2893d9 | 6974 | linux_look_up_symbols, |
ef57601b | 6975 | linux_request_interrupt, |
aa691b87 | 6976 | linux_read_auxv, |
802e8e6d | 6977 | linux_supports_z_point_type, |
d993e290 PA |
6978 | linux_insert_point, |
6979 | linux_remove_point, | |
3e572f71 PA |
6980 | linux_stopped_by_sw_breakpoint, |
6981 | linux_supports_stopped_by_sw_breakpoint, | |
6982 | linux_stopped_by_hw_breakpoint, | |
6983 | linux_supports_stopped_by_hw_breakpoint, | |
70b90b91 | 6984 | linux_supports_hardware_single_step, |
e013ee27 OF |
6985 | linux_stopped_by_watchpoint, |
6986 | linux_stopped_data_address, | |
db0dfaa0 LM |
6987 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6988 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6989 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6990 | linux_read_offsets, |
dae5f5cf DJ |
6991 | #else |
6992 | NULL, | |
6993 | #endif | |
6994 | #ifdef USE_THREAD_DB | |
6995 | thread_db_get_tls_address, | |
6996 | #else | |
6997 | NULL, | |
52fb6437 | 6998 | #endif |
efcbbd14 | 6999 | linux_qxfer_spu, |
59a016f0 | 7000 | hostio_last_error_from_errno, |
07e059b5 | 7001 | linux_qxfer_osdata, |
4aa995e1 | 7002 | linux_xfer_siginfo, |
bd99dc85 PA |
7003 | linux_supports_non_stop, |
7004 | linux_async, | |
7005 | linux_start_non_stop, | |
cdbfd419 | 7006 | linux_supports_multi_process, |
89245bc0 DB |
7007 | linux_supports_fork_events, |
7008 | linux_supports_vfork_events, | |
94585166 | 7009 | linux_supports_exec_events, |
de0d863e | 7010 | linux_handle_new_gdb_connection, |
cdbfd419 | 7011 | #ifdef USE_THREAD_DB |
dc146f7c | 7012 | thread_db_handle_monitor_command, |
cdbfd419 | 7013 | #else |
dc146f7c | 7014 | NULL, |
cdbfd419 | 7015 | #endif |
d26e3629 | 7016 | linux_common_core_of_thread, |
78d85199 | 7017 | linux_read_loadmap, |
219f2f23 PA |
7018 | linux_process_qsupported, |
7019 | linux_supports_tracepoints, | |
7020 | linux_read_pc, | |
8336d594 PA |
7021 | linux_write_pc, |
7022 | linux_thread_stopped, | |
7984d532 | 7023 | NULL, |
711e434b | 7024 | linux_pause_all, |
7984d532 | 7025 | linux_unpause_all, |
fa593d66 | 7026 | linux_stabilize_threads, |
6a271cae | 7027 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
7028 | linux_emit_ops, |
7029 | linux_supports_disable_randomization, | |
405f8e94 | 7030 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 7031 | linux_qxfer_libraries_svr4, |
d1feda86 | 7032 | linux_supports_agent, |
9accd112 MM |
7033 | #ifdef HAVE_LINUX_BTRACE |
7034 | linux_supports_btrace, | |
0568462b | 7035 | linux_enable_btrace, |
969c39fb | 7036 | linux_low_disable_btrace, |
9accd112 | 7037 | linux_low_read_btrace, |
f4abbc16 | 7038 | linux_low_btrace_conf, |
9accd112 MM |
7039 | #else |
7040 | NULL, | |
7041 | NULL, | |
7042 | NULL, | |
7043 | NULL, | |
f4abbc16 | 7044 | NULL, |
9accd112 | 7045 | #endif |
c2d6af84 | 7046 | linux_supports_range_stepping, |
e57f1de3 | 7047 | linux_proc_pid_to_exec_file, |
14d2069a GB |
7048 | linux_mntns_open_cloexec, |
7049 | linux_mntns_unlink, | |
7050 | linux_mntns_readlink, | |
dd373349 AT |
7051 | linux_breakpoint_kind_from_pc, |
7052 | linux_sw_breakpoint_from_kind | |
ce3a066d DJ |
7053 | }; |
7054 | ||
0d62e5e8 DJ |
7055 | static void |
7056 | linux_init_signals () | |
7057 | { | |
7058 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
7059 | to find what the cancel signal actually is. */ | |
1a981360 | 7060 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 7061 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 7062 | #endif |
0d62e5e8 DJ |
7063 | } |
7064 | ||
3aee8918 PA |
7065 | #ifdef HAVE_LINUX_REGSETS |
7066 | void | |
7067 | initialize_regsets_info (struct regsets_info *info) | |
7068 | { | |
7069 | for (info->num_regsets = 0; | |
7070 | info->regsets[info->num_regsets].size >= 0; | |
7071 | info->num_regsets++) | |
7072 | ; | |
3aee8918 PA |
7073 | } |
7074 | #endif | |
7075 | ||
da6d8c04 DJ |
7076 | void |
7077 | initialize_low (void) | |
7078 | { | |
bd99dc85 | 7079 | struct sigaction sigchld_action; |
dd373349 | 7080 | |
bd99dc85 | 7081 | memset (&sigchld_action, 0, sizeof (sigchld_action)); |
ce3a066d | 7082 | set_target_ops (&linux_target_ops); |
dd373349 | 7083 | |
0d62e5e8 | 7084 | linux_init_signals (); |
aa7c7447 | 7085 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
7086 | |
7087 | sigchld_action.sa_handler = sigchld_handler; | |
7088 | sigemptyset (&sigchld_action.sa_mask); | |
7089 | sigchld_action.sa_flags = SA_RESTART; | |
7090 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
7091 | |
7092 | initialize_low_arch (); | |
89245bc0 DB |
7093 | |
7094 | linux_check_ptrace_features (); | |
da6d8c04 | 7095 | } |